1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007 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"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
57 static tree grokparms (cp_parameter_declarator *, tree *);
58 static const char *redeclaration_error_message (tree, tree);
60 static int decl_jump_unsafe (tree);
61 static void require_complete_types_for_parms (tree);
62 static int ambi_op_p (enum tree_code);
63 static int unary_op_p (enum tree_code);
64 static void push_local_name (tree);
65 static tree grok_reference_init (tree, tree, tree, tree *);
66 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
68 static void record_unknown_type (tree, const char *);
69 static tree builtin_function_1 (tree, tree);
70 static tree build_library_fn_1 (tree, enum tree_code, tree);
71 static int member_function_or_else (tree, tree, enum overload_flags);
72 static void bad_specifiers (tree, const char *, int, int, int, int,
74 static void check_for_uninitialized_const_var (tree);
75 static hashval_t typename_hash (const void *);
76 static int typename_compare (const void *, const void *);
77 static tree local_variable_p_walkfn (tree *, int *, void *);
78 static tree record_builtin_java_type (const char *, int);
79 static const char *tag_name (enum tag_types);
80 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
81 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
82 static void maybe_deduce_size_from_array_init (tree, tree);
83 static void layout_var_decl (tree);
84 static void maybe_commonize_var (tree);
85 static tree check_initializer (tree, tree, int, tree *);
86 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
87 static void save_function_data (tree);
88 static void check_function_type (tree, tree);
89 static void finish_constructor_body (void);
90 static void begin_destructor_body (void);
91 static void finish_destructor_body (void);
92 static tree create_array_type_for_decl (tree, tree, tree);
93 static tree get_atexit_node (void);
94 static tree get_dso_handle_node (void);
95 static tree start_cleanup_fn (void);
96 static void end_cleanup_fn (void);
97 static tree cp_make_fname_decl (tree, int);
98 static void initialize_predefined_identifiers (void);
99 static tree check_special_function_return_type
100 (special_function_kind, tree, tree);
101 static tree push_cp_library_fn (enum tree_code, tree);
102 static tree build_cp_library_fn (tree, enum tree_code, tree);
103 static void store_parm_decls (tree);
104 static void initialize_local_var (tree, tree);
105 static void expand_static_init (tree, tree);
106 static tree next_initializable_field (tree);
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
124 tree vtbl_ptr_type_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
137 The FUNCTION_DECL for the default `::operator delete'.
139 tree global_delete_fndecl;
142 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
143 tree tinfo_var_id; */
145 tree cp_global_trees[CPTI_MAX];
147 /* Indicates that there is a type value in some namespace, although
148 that is not necessarily in scope at the moment. */
150 tree global_type_node;
152 /* The node that holds the "name" of the global scope. */
153 tree global_scope_name;
155 #define local_names cp_function_chain->x_local_names
157 /* A list of objects which have constructors or destructors
158 which reside in the global scope. The decl is stored in
159 the TREE_VALUE slot and the initializer is stored
160 in the TREE_PURPOSE slot. */
161 tree static_aggregates;
165 /* A node for the integer constants 2, and 3. */
167 tree integer_two_node, integer_three_node;
169 /* Used only for jumps to as-yet undefined labels, since jumps to
170 defined labels can have their validity checked immediately. */
172 struct named_label_use_entry GTY(())
174 struct named_label_use_entry *next;
175 /* The binding level to which this entry is *currently* attached.
176 This is initially the binding level in which the goto appeared,
177 but is modified as scopes are closed. */
178 struct cp_binding_level *binding_level;
179 /* The head of the names list that was current when the goto appeared,
180 or the inner scope popped. These are the decls that will *not* be
181 skipped when jumping to the label. */
183 /* The location of the goto, for error reporting. */
184 location_t o_goto_locus;
185 /* True if an OpenMP structured block scope has been closed since
186 the goto appeared. This means that the branch from the label will
187 illegally exit an OpenMP scope. */
191 /* A list of all LABEL_DECLs in the function that have names. Here so
192 we can clear out their names' definitions at the end of the
193 function, and so we can check the validity of jumps to these labels. */
195 struct named_label_entry GTY(())
197 /* The decl itself. */
200 /* The binding level to which the label is *currently* attached.
201 This is initially set to the binding level in which the label
202 is defined, but is modified as scopes are closed. */
203 struct cp_binding_level *binding_level;
204 /* The head of the names list that was current when the label was
205 defined, or the inner scope popped. These are the decls that will
206 be skipped when jumping to the label. */
208 /* A tree list of all decls from all binding levels that would be
209 crossed by a backward branch to the label. */
212 /* A list of uses of the label, before the label is defined. */
213 struct named_label_use_entry *uses;
215 /* The following bits are set after the label is defined, and are
216 updated as scopes are popped. They indicate that a backward jump
217 to the label will illegally enter a scope of the given flavor. */
223 #define named_labels cp_function_chain->x_named_labels
225 /* The number of function bodies which we are currently processing.
226 (Zero if we are at namespace scope, one inside the body of a
227 function, two inside the body of a function in a local class, etc.) */
230 /* States indicating how grokdeclarator() should handle declspecs marked
231 with __attribute__((deprecated)). An object declared as
232 __attribute__((deprecated)) suppresses warnings of uses of other
235 enum deprecated_states {
240 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
243 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
244 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
245 time the VAR_DECL was declared, the type was incomplete. */
247 static GTY(()) tree incomplete_vars;
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
254 current_tmpl_spec_kind (int n_class_scopes)
256 int n_template_parm_scopes = 0;
257 int seen_specialization_p = 0;
258 int innermost_specialization_p = 0;
259 struct cp_binding_level *b;
261 /* Scan through the template parameter scopes. */
262 for (b = current_binding_level;
263 b->kind == sk_template_parms;
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
270 template <class T> template <> ...
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b->explicit_spec_p)
277 if (n_template_parm_scopes == 0)
278 innermost_specialization_p = 1;
280 seen_specialization_p = 1;
282 else if (seen_specialization_p == 1)
283 return tsk_invalid_member_spec;
285 ++n_template_parm_scopes;
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation)
291 if (n_template_parm_scopes != 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
295 template <class T> template void f(int);
297 This is erroneous. */
298 return tsk_invalid_expl_inst;
300 return tsk_expl_inst;
303 if (n_template_parm_scopes < n_class_scopes)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
307 template <class T> void R<T>::S<T>::f(int);
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms;
312 else if (n_template_parm_scopes == n_class_scopes)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
316 template <class T> void S<T>::f(int);
318 The `class T' maches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
321 else if (n_template_parm_scopes > n_class_scopes + 1)
322 /* We've got too many template headers. For example:
324 template <> template <class T> void f (T);
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms;
329 /* This must be a template. It's of the form:
331 template <class T> template <class U> void S<T>::f(U);
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
336 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
339 /* Exit the current scope. */
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
351 pop_label (tree label, tree old_value)
353 if (!processing_template_decl)
355 if (DECL_INITIAL (label) == NULL_TREE)
359 error ("label %q+D used but not defined", label);
360 #ifdef USE_MAPPED_LOCATION
361 location = input_location; /* FIXME want (input_filename, (line)0) */
363 location.file = input_filename;
366 /* Avoid crashing later. */
367 define_label (location, DECL_NAME (label));
370 warn_for_unused_label (label);
373 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
376 /* At the end of a function, all labels declared within the function
377 go out of scope. BLOCK is the top-level block for the
381 pop_labels_1 (void **slot, void *data)
383 struct named_label_entry *ent = (struct named_label_entry *) *slot;
384 tree block = (tree) data;
386 pop_label (ent->label_decl, NULL_TREE);
388 /* Put the labels into the "variables" of the top-level block,
389 so debugger can see them. */
390 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
391 BLOCK_VARS (block) = ent->label_decl;
393 htab_clear_slot (named_labels, slot);
399 pop_labels (tree block)
403 htab_traverse (named_labels, pop_labels_1, block);
408 /* At the end of a block with local labels, restore the outer definition. */
411 pop_local_label (tree label, tree old_value)
413 struct named_label_entry dummy;
416 pop_label (label, old_value);
418 dummy.label_decl = label;
419 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
420 htab_clear_slot (named_labels, slot);
423 /* The following two routines are used to interface to Objective-C++.
424 The binding level is purposely treated as an opaque type. */
427 objc_get_current_scope (void)
429 return current_binding_level;
432 /* The following routine is used by the NeXT-style SJLJ exceptions;
433 variables get marked 'volatile' so as to not be clobbered by
434 _setjmp()/_longjmp() calls. All variables in the current scope,
435 as well as parent scopes up to (but not including) ENCLOSING_BLK
436 shall be thusly marked. */
439 objc_mark_locals_volatile (void *enclosing_blk)
441 struct cp_binding_level *scope;
443 for (scope = current_binding_level;
444 scope && scope != enclosing_blk;
445 scope = scope->level_chain)
449 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
450 objc_volatilize_decl (decl);
452 /* Do not climb up past the current function. */
453 if (scope->kind == sk_function_parms)
458 /* Update data for defined and undefined labels when leaving a scope. */
461 poplevel_named_label_1 (void **slot, void *data)
463 struct named_label_entry *ent = (struct named_label_entry *) *slot;
464 struct cp_binding_level *bl = (struct cp_binding_level *) data;
465 struct cp_binding_level *obl = bl->level_chain;
467 if (ent->binding_level == bl)
471 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
472 if (decl_jump_unsafe (decl))
473 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
475 ent->binding_level = obl;
476 ent->names_in_scope = obl->names;
480 ent->in_try_scope = true;
483 ent->in_catch_scope = true;
486 ent->in_omp_scope = true;
494 struct named_label_use_entry *use;
496 for (use = ent->uses; use ; use = use->next)
497 if (use->binding_level == bl)
499 use->binding_level = obl;
500 use->names_in_scope = obl->names;
501 if (bl->kind == sk_omp)
502 use->in_omp_scope = true;
509 /* Exit a binding level.
510 Pop the level off, and restore the state of the identifier-decl mappings
511 that were in effect when this level was entered.
513 If KEEP == 1, this level had explicit declarations, so
514 and create a "block" (a BLOCK node) for the level
515 to record its declarations and subblocks for symbol table output.
517 If FUNCTIONBODY is nonzero, this level is the body of a function,
518 so create a block as if KEEP were set and also clear out all
521 If REVERSE is nonzero, reverse the order of decls before putting
522 them into the BLOCK. */
525 poplevel (int keep, int reverse, int functionbody)
528 /* The chain of decls was accumulated in reverse order.
529 Put it into forward order, just for cleanliness. */
531 int tmp = functionbody;
532 int real_functionbody;
536 int leaving_for_scope;
539 timevar_push (TV_NAME_LOOKUP);
544 gcc_assert (current_binding_level->kind != sk_class);
546 real_functionbody = (current_binding_level->kind == sk_cleanup
547 ? ((functionbody = 0), tmp) : functionbody);
548 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
550 gcc_assert (!VEC_length(cp_class_binding,
551 current_binding_level->class_shadowed));
553 /* We used to use KEEP == 2 to indicate that the new block should go
554 at the beginning of the list of blocks at this binding level,
555 rather than the end. This hack is no longer used. */
556 gcc_assert (keep == 0 || keep == 1);
558 if (current_binding_level->keep)
561 /* Any uses of undefined labels, and any defined labels, now operate
562 under constraints of next binding contour. */
563 if (cfun && !functionbody && named_labels)
564 htab_traverse (named_labels, poplevel_named_label_1,
565 current_binding_level);
567 /* Get the decls in the order they were written.
568 Usually current_binding_level->names is in reverse order.
569 But parameter decls were previously put in forward order. */
572 current_binding_level->names
573 = decls = nreverse (current_binding_level->names);
575 decls = current_binding_level->names;
577 /* If there were any declarations or structure tags in that level,
578 or if this level is a function body,
579 create a BLOCK to record them for the life of this function. */
581 if (keep == 1 || functionbody)
582 block = make_node (BLOCK);
583 if (block != NULL_TREE)
585 BLOCK_VARS (block) = decls;
586 BLOCK_SUBBLOCKS (block) = subblocks;
589 /* In each subblock, record that this is its superior. */
591 for (link = subblocks; link; link = TREE_CHAIN (link))
592 BLOCK_SUPERCONTEXT (link) = block;
594 /* We still support the old for-scope rules, whereby the variables
595 in a for-init statement were in scope after the for-statement
596 ended. We only use the new rules if flag_new_for_scope is
599 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
601 /* Before we remove the declarations first check for unused variables. */
602 if (warn_unused_variable
603 && !processing_template_decl)
604 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
605 if (TREE_CODE (decl) == VAR_DECL
606 && ! TREE_USED (decl)
607 && ! DECL_IN_SYSTEM_HEADER (decl)
608 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
609 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
611 /* Remove declarations for all the DECLs in this level. */
612 for (link = decls; link; link = TREE_CHAIN (link))
614 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
617 tree name = DECL_NAME (link);
621 ob = outer_binding (name,
622 IDENTIFIER_BINDING (name),
625 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
627 ns_binding = NULL_TREE;
629 if (ob && ob->scope == current_binding_level->level_chain)
630 /* We have something like:
635 and we are leaving the `for' scope. There's no reason to
636 keep the binding of the inner `i' in this case. */
637 pop_binding (name, link);
638 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
639 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
640 /* Here, we have something like:
648 We must pop the for-scope binding so we know what's a
649 type and what isn't. */
650 pop_binding (name, link);
653 /* Mark this VAR_DECL as dead so that we can tell we left it
654 there only for backward compatibility. */
655 DECL_DEAD_FOR_LOCAL (link) = 1;
657 /* Keep track of what should have happened when we
658 popped the binding. */
661 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
662 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
665 /* Add it to the list of dead variables in the next
666 outermost binding to that we can remove these when we
667 leave that binding. */
668 current_binding_level->level_chain->dead_vars_from_for
669 = tree_cons (NULL_TREE, link,
670 current_binding_level->level_chain->
673 /* Although we don't pop the cxx_binding, we do clear
674 its SCOPE since the scope is going away now. */
675 IDENTIFIER_BINDING (name)->scope
676 = current_binding_level->level_chain;
683 /* Remove the binding. */
686 if (TREE_CODE (decl) == TREE_LIST)
687 decl = TREE_VALUE (decl);
690 if (TREE_CODE (name) == OVERLOAD)
691 name = OVL_FUNCTION (name);
693 gcc_assert (DECL_P (name));
694 pop_binding (DECL_NAME (name), decl);
698 /* Remove declarations for any `for' variables from inner scopes
699 that we kept around. */
700 for (link = current_binding_level->dead_vars_from_for;
701 link; link = TREE_CHAIN (link))
702 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
704 /* Restore the IDENTIFIER_TYPE_VALUEs. */
705 for (link = current_binding_level->type_shadowed;
706 link; link = TREE_CHAIN (link))
707 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
709 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
710 for (link = current_binding_level->shadowed_labels;
712 link = TREE_CHAIN (link))
713 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
715 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
716 list if a `using' declaration put them there. The debugging
717 back ends won't understand OVERLOAD, so we remove them here.
718 Because the BLOCK_VARS are (temporarily) shared with
719 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
720 popped all the bindings. */
725 for (d = &BLOCK_VARS (block); *d; )
727 if (TREE_CODE (*d) == TREE_LIST)
728 *d = TREE_CHAIN (*d);
730 d = &TREE_CHAIN (*d);
734 /* If the level being exited is the top level of a function,
735 check over all the labels. */
738 /* Since this is the top level block of a function, the vars are
739 the function's parameters. Don't leave them in the BLOCK
740 because they are found in the FUNCTION_DECL instead. */
741 BLOCK_VARS (block) = 0;
745 kind = current_binding_level->kind;
746 if (kind == sk_cleanup)
750 /* If this is a temporary binding created for a cleanup, then we'll
751 have pushed a statement list level. Pop that, create a new
752 BIND_EXPR for the block, and insert it into the stream. */
753 stmt = pop_stmt_list (current_binding_level->statement_list);
754 stmt = c_build_bind_expr (block, stmt);
761 /* The current function is being defined, so its DECL_INITIAL
762 should be error_mark_node. */
763 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
764 DECL_INITIAL (current_function_decl) = block;
767 current_binding_level->blocks
768 = chainon (current_binding_level->blocks, block);
770 /* If we did not make a block for the level just exited,
771 any blocks made for inner levels
772 (since they cannot be recorded as subblocks in that level)
773 must be carried forward so they will later become subblocks
774 of something else. */
776 current_binding_level->blocks
777 = chainon (current_binding_level->blocks, subblocks);
779 /* Each and every BLOCK node created here in `poplevel' is important
780 (e.g. for proper debugging information) so if we created one
781 earlier, mark it as "used". */
783 TREE_USED (block) = 1;
785 /* All temporary bindings created for cleanups are popped silently. */
786 if (kind == sk_cleanup)
789 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
792 /* Insert BLOCK at the end of the list of subblocks of the
793 current binding level. This is used when a BIND_EXPR is expanded,
794 to handle the BLOCK node inside the BIND_EXPR. */
797 insert_block (tree block)
799 TREE_USED (block) = 1;
800 current_binding_level->blocks
801 = chainon (current_binding_level->blocks, block);
804 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
805 itself, calling F for each. The DATA is passed to F as well. */
808 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
811 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
813 result |= (*f) (namespace, data);
815 for (; current; current = TREE_CHAIN (current))
816 result |= walk_namespaces_r (current, f, data);
821 /* Walk all the namespaces, calling F for each. The DATA is passed to
825 walk_namespaces (walk_namespaces_fn f, void* data)
827 return walk_namespaces_r (global_namespace, f, data);
830 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
831 DATA is non-NULL, this is the last time we will call
832 wrapup_global_declarations for this NAMESPACE. */
835 wrapup_globals_for_namespace (tree namespace, void* data)
837 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
838 VEC(tree,gc) *statics = level->static_decls;
839 tree *vec = VEC_address (tree, statics);
840 int len = VEC_length (tree, statics);
841 int last_time = (data != 0);
845 check_global_declarations (vec, len);
846 emit_debug_global_declarations (vec, len);
850 /* Write out any globals that need to be output. */
851 return wrapup_global_declarations (vec, len);
855 /* In C++, you don't have to write `struct S' to refer to `S'; you
856 can just use `S'. We accomplish this by creating a TYPE_DECL as
857 if the user had written `typedef struct S S'. Create and return
858 the TYPE_DECL for TYPE. */
861 create_implicit_typedef (tree name, tree type)
865 decl = build_decl (TYPE_DECL, name, type);
866 DECL_ARTIFICIAL (decl) = 1;
867 /* There are other implicit type declarations, like the one *within*
868 a class that allows you to write `S::S'. We must distinguish
870 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
871 TYPE_NAME (type) = decl;
876 /* Remember a local name for name-mangling purposes. */
879 push_local_name (tree decl)
884 timevar_push (TV_NAME_LOOKUP);
886 name = DECL_NAME (decl);
888 nelts = VEC_length (tree, local_names);
889 for (i = 0; i < nelts; i++)
891 t = VEC_index (tree, local_names, i);
892 if (DECL_NAME (t) == name)
894 if (!DECL_LANG_SPECIFIC (decl))
895 retrofit_lang_decl (decl);
896 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
897 if (DECL_LANG_SPECIFIC (t))
898 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
900 DECL_DISCRIMINATOR (decl) = 1;
902 VEC_replace (tree, local_names, i, decl);
903 timevar_pop (TV_NAME_LOOKUP);
908 VEC_safe_push (tree, gc, local_names, decl);
909 timevar_pop (TV_NAME_LOOKUP);
912 /* Subroutine of duplicate_decls: return truthvalue of whether
913 or not types of these decls match.
915 For C++, we must compare the parameter list so that `int' can match
916 `int&' in a parameter position, but `int&' is not confused with
920 decls_match (tree newdecl, tree olddecl)
924 if (newdecl == olddecl)
927 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
928 /* If the two DECLs are not even the same kind of thing, we're not
929 interested in their types. */
932 if (TREE_CODE (newdecl) == FUNCTION_DECL)
934 tree f1 = TREE_TYPE (newdecl);
935 tree f2 = TREE_TYPE (olddecl);
936 tree p1 = TYPE_ARG_TYPES (f1);
937 tree p2 = TYPE_ARG_TYPES (f2);
939 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
940 && ! (DECL_EXTERN_C_P (newdecl)
941 && DECL_EXTERN_C_P (olddecl)))
944 if (TREE_CODE (f1) != TREE_CODE (f2))
947 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
949 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
950 && (DECL_BUILT_IN (olddecl)
951 #ifndef NO_IMPLICIT_EXTERN_C
952 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
953 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
957 types_match = self_promoting_args_p (p1);
958 if (p1 == void_list_node)
959 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
961 #ifndef NO_IMPLICIT_EXTERN_C
962 else if (p1 == NULL_TREE
963 && (DECL_EXTERN_C_P (olddecl)
964 && DECL_IN_SYSTEM_HEADER (olddecl)
965 && !DECL_CLASS_SCOPE_P (olddecl))
966 && (DECL_EXTERN_C_P (newdecl)
967 && DECL_IN_SYSTEM_HEADER (newdecl)
968 && !DECL_CLASS_SCOPE_P (newdecl)))
970 types_match = self_promoting_args_p (p2);
971 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
975 types_match = compparms (p1, p2);
980 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
982 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
983 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
986 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
987 DECL_TEMPLATE_PARMS (olddecl)))
990 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
991 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
992 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
994 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
995 DECL_TEMPLATE_RESULT (newdecl));
999 /* Need to check scope for variable declaration (VAR_DECL).
1000 For typedef (TYPE_DECL), scope is ignored. */
1001 if (TREE_CODE (newdecl) == VAR_DECL
1002 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1004 Two declarations for an object with C language linkage
1005 with the same name (ignoring the namespace that qualify
1006 it) that appear in different namespace scopes refer to
1008 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1011 if (TREE_TYPE (newdecl) == error_mark_node)
1012 types_match = TREE_TYPE (olddecl) == error_mark_node;
1013 else if (TREE_TYPE (olddecl) == NULL_TREE)
1014 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1015 else if (TREE_TYPE (newdecl) == NULL_TREE)
1018 types_match = comptypes (TREE_TYPE (newdecl),
1019 TREE_TYPE (olddecl),
1020 COMPARE_REDECLARATION);
1026 /* If NEWDECL is `static' and an `extern' was seen previously,
1027 warn about it. OLDDECL is the previous declaration.
1029 Note that this does not apply to the C++ case of declaring
1030 a variable `extern const' and then later `const'.
1032 Don't complain about built-in functions, since they are beyond
1033 the user's control. */
1036 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1040 if (TREE_CODE (newdecl) == TYPE_DECL
1041 || TREE_CODE (newdecl) == TEMPLATE_DECL
1042 || TREE_CODE (newdecl) == CONST_DECL
1043 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1046 /* Don't get confused by static member functions; that's a different
1048 if (TREE_CODE (newdecl) == FUNCTION_DECL
1049 && DECL_STATIC_FUNCTION_P (newdecl))
1052 /* If the old declaration was `static', or the new one isn't, then
1053 then everything is OK. */
1054 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1057 /* It's OK to declare a builtin function as `static'. */
1058 if (TREE_CODE (olddecl) == FUNCTION_DECL
1059 && DECL_ARTIFICIAL (olddecl))
1062 name = DECL_ASSEMBLER_NAME (newdecl);
1063 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1064 pedwarn ("previous declaration of %q+D", olddecl);
1067 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1068 function templates. If their exception specifications do not
1069 match, issue a diagnostic. */
1072 check_redeclaration_exception_specification (tree new_decl,
1077 tree new_exceptions;
1078 tree old_exceptions;
1080 new_type = TREE_TYPE (new_decl);
1081 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1082 old_type = TREE_TYPE (old_decl);
1083 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1087 If any declaration of a function has an exception-specification,
1088 all declarations, including the definition and an explicit
1089 specialization, of that function shall have an
1090 exception-specification with the same set of type-ids. */
1091 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1092 && ! DECL_IS_BUILTIN (old_decl)
1094 && !comp_except_specs (new_exceptions, old_exceptions,
1097 error ("declaration of %qF throws different exceptions", new_decl);
1098 error ("from previous declaration %q+F", old_decl);
1102 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1103 If the redeclaration is invalid, a diagnostic is issued, and the
1104 error_mark_node is returned. Otherwise, OLDDECL is returned.
1106 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1109 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1112 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1114 unsigned olddecl_uid = DECL_UID (olddecl);
1115 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1116 int new_defines_function = 0;
1119 if (newdecl == olddecl)
1122 types_match = decls_match (newdecl, olddecl);
1124 /* If either the type of the new decl or the type of the old decl is an
1125 error_mark_node, then that implies that we have already issued an
1126 error (earlier) for some bogus type specification, and in that case,
1127 it is rather pointless to harass the user with yet more error message
1128 about the same declaration, so just pretend the types match here. */
1129 if (TREE_TYPE (newdecl) == error_mark_node
1130 || TREE_TYPE (olddecl) == error_mark_node)
1131 return error_mark_node;
1133 if (DECL_P (olddecl)
1134 && TREE_CODE (newdecl) == FUNCTION_DECL
1135 && TREE_CODE (olddecl) == FUNCTION_DECL
1136 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1138 if (DECL_DECLARED_INLINE_P (newdecl)
1139 && DECL_UNINLINABLE (newdecl)
1140 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1141 /* Already warned elsewhere. */;
1142 else if (DECL_DECLARED_INLINE_P (olddecl)
1143 && DECL_UNINLINABLE (olddecl)
1144 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1145 /* Already warned. */;
1146 else if (DECL_DECLARED_INLINE_P (newdecl)
1147 && DECL_UNINLINABLE (olddecl)
1148 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1150 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1152 warning (OPT_Wattributes, "previous declaration of %q+D "
1153 "with attribute noinline", olddecl);
1155 else if (DECL_DECLARED_INLINE_P (olddecl)
1156 && DECL_UNINLINABLE (newdecl)
1157 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1159 warning (OPT_Wattributes, "function %q+D redeclared with "
1160 "attribute noinline", newdecl);
1161 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1166 /* Check for redeclaration and other discrepancies. */
1167 if (TREE_CODE (olddecl) == FUNCTION_DECL
1168 && DECL_ARTIFICIAL (olddecl))
1170 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1171 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1173 /* Avoid warnings redeclaring built-ins which have not been
1174 explicitly declared. */
1175 if (DECL_ANTICIPATED (olddecl))
1178 /* If you declare a built-in or predefined function name as static,
1179 the old definition is overridden, but optionally warn this was a
1180 bad choice of name. */
1181 if (! TREE_PUBLIC (newdecl))
1183 warning (OPT_Wshadow, "shadowing %s function %q#D",
1184 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1186 /* Discard the old built-in function. */
1189 /* If the built-in is not ansi, then programs can override
1190 it even globally without an error. */
1191 else if (! DECL_BUILT_IN (olddecl))
1192 warning (0, "library function %q#D redeclared as non-function %q#D",
1196 error ("declaration of %q#D", newdecl);
1197 error ("conflicts with built-in declaration %q#D",
1202 else if (!types_match)
1204 /* Avoid warnings redeclaring built-ins which have not been
1205 explicitly declared. */
1206 if (DECL_ANTICIPATED (olddecl))
1208 /* Deal with fileptr_type_node. FILE type is not known
1209 at the time we create the builtins. */
1212 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1213 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1215 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1218 else if (TREE_VALUE (t2) == fileptr_type_node)
1220 tree t = TREE_VALUE (t1);
1222 if (TREE_CODE (t) == POINTER_TYPE
1223 && TYPE_NAME (TREE_TYPE (t))
1224 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1225 == get_identifier ("FILE")
1226 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1228 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1230 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1231 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1232 types_match = decls_match (newdecl, olddecl);
1234 return duplicate_decls (newdecl, olddecl,
1236 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1239 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1242 else if ((DECL_EXTERN_C_P (newdecl)
1243 && DECL_EXTERN_C_P (olddecl))
1244 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1245 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1247 /* A near match; override the builtin. */
1249 if (TREE_PUBLIC (newdecl))
1251 warning (0, "new declaration %q#D", newdecl);
1252 warning (0, "ambiguates built-in declaration %q#D",
1256 warning (OPT_Wshadow, "shadowing %s function %q#D",
1257 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1261 /* Discard the old built-in function. */
1264 /* Replace the old RTL to avoid problems with inlining. */
1265 COPY_DECL_RTL (newdecl, olddecl);
1267 /* Even if the types match, prefer the new declarations type for
1268 built-ins which have not been explicitly declared, for
1269 exception lists, etc... */
1270 else if (DECL_ANTICIPATED (olddecl))
1272 tree type = TREE_TYPE (newdecl);
1273 tree attribs = (*targetm.merge_type_attributes)
1274 (TREE_TYPE (olddecl), type);
1276 type = cp_build_type_attribute_variant (type, attribs);
1277 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1280 /* Whether or not the builtin can throw exceptions has no
1281 bearing on this declarator. */
1282 TREE_NOTHROW (olddecl) = 0;
1284 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1286 /* If a builtin function is redeclared as `static', merge
1287 the declarations, but make the original one static. */
1288 DECL_THIS_STATIC (olddecl) = 1;
1289 TREE_PUBLIC (olddecl) = 0;
1291 /* Make the old declaration consistent with the new one so
1292 that all remnants of the builtin-ness of this function
1293 will be banished. */
1294 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1295 COPY_DECL_RTL (newdecl, olddecl);
1298 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1300 /* C++ Standard, 3.3, clause 4:
1301 "[Note: a namespace name or a class template name must be unique
1302 in its declarative region (7.3.2, clause 14). ]" */
1303 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1304 && TREE_CODE (newdecl) != NAMESPACE_DECL
1305 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1306 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1307 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1308 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1310 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1311 && TREE_CODE (newdecl) != TYPE_DECL)
1312 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1313 && TREE_CODE (olddecl) != TYPE_DECL))
1315 /* We do nothing special here, because C++ does such nasty
1316 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1317 get shadowed, and know that if we need to find a TYPE_DECL
1318 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1319 slot of the identifier. */
1323 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1324 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1325 || (TREE_CODE (olddecl) == FUNCTION_DECL
1326 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1330 error ("%q#D redeclared as different kind of symbol", newdecl);
1331 if (TREE_CODE (olddecl) == TREE_LIST)
1332 olddecl = TREE_VALUE (olddecl);
1333 error ("previous declaration of %q+#D", olddecl);
1335 return error_mark_node;
1337 else if (!types_match)
1339 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1340 /* These are certainly not duplicate declarations; they're
1341 from different scopes. */
1344 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1346 /* The name of a class template may not be declared to refer to
1347 any other template, class, function, object, namespace, value,
1348 or type in the same scope. */
1349 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1350 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1352 error ("declaration of template %q#D", newdecl);
1353 error ("conflicts with previous declaration %q+#D", olddecl);
1355 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1356 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1357 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1358 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1359 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1360 DECL_TEMPLATE_PARMS (olddecl))
1361 /* Template functions can be disambiguated by
1363 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1364 TREE_TYPE (TREE_TYPE (olddecl))))
1366 error ("new declaration %q#D", newdecl);
1367 error ("ambiguates old declaration %q+#D", olddecl);
1371 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1373 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1375 error ("declaration of C function %q#D conflicts with",
1377 error ("previous declaration %q+#D here", olddecl);
1379 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1380 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1382 error ("new declaration %q#D", newdecl);
1383 error ("ambiguates old declaration %q+#D", olddecl);
1384 return error_mark_node;
1391 error ("conflicting declaration %q#D", newdecl);
1392 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1393 return error_mark_node;
1396 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1397 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1398 && (!DECL_TEMPLATE_INFO (newdecl)
1399 || (DECL_TI_TEMPLATE (newdecl)
1400 != DECL_TI_TEMPLATE (olddecl))))
1401 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1402 && (!DECL_TEMPLATE_INFO (olddecl)
1403 || (DECL_TI_TEMPLATE (olddecl)
1404 != DECL_TI_TEMPLATE (newdecl))))))
1405 /* It's OK to have a template specialization and a non-template
1406 with the same type, or to have specializations of two
1407 different templates with the same type. Note that if one is a
1408 specialization, and the other is an instantiation of the same
1409 template, that we do not exit at this point. That situation
1410 can occur if we instantiate a template class, and then
1411 specialize one of its methods. This situation is valid, but
1412 the declarations must be merged in the usual way. */
1414 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1415 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1416 && !DECL_USE_TEMPLATE (newdecl))
1417 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1418 && !DECL_USE_TEMPLATE (olddecl))))
1419 /* One of the declarations is a template instantiation, and the
1420 other is not a template at all. That's OK. */
1422 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1424 /* In [namespace.alias] we have:
1426 In a declarative region, a namespace-alias-definition can be
1427 used to redefine a namespace-alias declared in that declarative
1428 region to refer only to the namespace to which it already
1431 Therefore, if we encounter a second alias directive for the same
1432 alias, we can just ignore the second directive. */
1433 if (DECL_NAMESPACE_ALIAS (newdecl)
1434 && (DECL_NAMESPACE_ALIAS (newdecl)
1435 == DECL_NAMESPACE_ALIAS (olddecl)))
1437 /* [namespace.alias]
1439 A namespace-name or namespace-alias shall not be declared as
1440 the name of any other entity in the same declarative region.
1441 A namespace-name defined at global scope shall not be
1442 declared as the name of any other entity in any global scope
1444 error ("declaration of namespace %qD conflicts with", newdecl);
1445 error ("previous declaration of namespace %q+D here", olddecl);
1446 return error_mark_node;
1450 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1453 error (errmsg, newdecl);
1454 if (DECL_NAME (olddecl) != NULL_TREE)
1455 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1456 ? "%q+#D previously defined here"
1457 : "%q+#D previously declared here", olddecl);
1458 return error_mark_node;
1460 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1461 && DECL_INITIAL (olddecl) != NULL_TREE
1462 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1463 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1465 /* Prototype decl follows defn w/o prototype. */
1466 warning (0, "prototype for %q+#D", newdecl);
1467 warning (0, "%Jfollows non-prototype definition here", olddecl);
1469 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1470 || TREE_CODE (olddecl) == VAR_DECL)
1471 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1474 If two declarations of the same function or object
1475 specify different linkage-specifications ..., the program
1476 is ill-formed.... Except for functions with C++ linkage,
1477 a function declaration without a linkage specification
1478 shall not precede the first linkage specification for
1479 that function. A function can be declared without a
1480 linkage specification after an explicit linkage
1481 specification has been seen; the linkage explicitly
1482 specified in the earlier declaration is not affected by
1483 such a function declaration.
1485 DR 563 raises the question why the restrictions on
1486 functions should not also apply to objects. Older
1487 versions of G++ silently ignore the linkage-specification
1495 which is clearly wrong. Therefore, we now treat objects
1497 if (current_lang_depth () == 0)
1499 /* There is no explicit linkage-specification, so we use
1500 the linkage from the previous declaration. */
1501 if (!DECL_LANG_SPECIFIC (newdecl))
1502 retrofit_lang_decl (newdecl);
1503 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1507 error ("previous declaration of %q+#D with %qL linkage",
1508 olddecl, DECL_LANGUAGE (olddecl));
1509 error ("conflicts with new declaration with %qL linkage",
1510 DECL_LANGUAGE (newdecl));
1514 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1516 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1518 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1519 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1522 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1523 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1525 for (; t1 && t1 != void_list_node;
1526 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1527 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1529 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1532 pedwarn ("default argument given for parameter %d of %q#D",
1534 pedwarn ("after previous specification in %q+#D", olddecl);
1538 error ("default argument given for parameter %d of %q#D",
1540 error ("after previous specification in %q+#D",
1545 if (DECL_DECLARED_INLINE_P (newdecl)
1546 && ! DECL_DECLARED_INLINE_P (olddecl)
1547 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1549 warning (0, "%q#D was used before it was declared inline", newdecl);
1550 warning (0, "%Jprevious non-inline declaration here", olddecl);
1555 /* Do not merge an implicit typedef with an explicit one. In:
1559 typedef class A A __attribute__ ((foo));
1561 the attribute should apply only to the typedef. */
1562 if (TREE_CODE (olddecl) == TYPE_DECL
1563 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1564 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1567 /* If new decl is `static' and an `extern' was seen previously,
1569 warn_extern_redeclared_static (newdecl, olddecl);
1571 /* We have committed to returning 1 at this point. */
1572 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1574 /* Now that functions must hold information normally held
1575 by field decls, there is extra work to do so that
1576 declaration information does not get destroyed during
1578 if (DECL_VINDEX (olddecl))
1579 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1580 if (DECL_CONTEXT (olddecl))
1581 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1582 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1583 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1584 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1585 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1586 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1587 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1588 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1589 SET_OVERLOADED_OPERATOR_CODE
1590 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1591 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1593 /* Optionally warn about more than one declaration for the same
1594 name, but don't warn about a function declaration followed by a
1596 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1597 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1598 /* Don't warn about extern decl followed by definition. */
1599 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1600 /* Don't warn about friends, let add_friend take care of it. */
1601 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1603 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1604 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1608 /* Deal with C++: must preserve virtual function table size. */
1609 if (TREE_CODE (olddecl) == TYPE_DECL)
1611 tree newtype = TREE_TYPE (newdecl);
1612 tree oldtype = TREE_TYPE (olddecl);
1614 if (newtype != error_mark_node && oldtype != error_mark_node
1615 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1616 CLASSTYPE_FRIEND_CLASSES (newtype)
1617 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1619 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1622 /* Copy all the DECL_... slots specified in the new decl
1623 except for any that we copy here from the old type. */
1624 DECL_ATTRIBUTES (newdecl)
1625 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1627 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1631 old_result = DECL_TEMPLATE_RESULT (olddecl);
1632 new_result = DECL_TEMPLATE_RESULT (newdecl);
1633 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1634 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1635 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1636 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1638 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1640 DECL_INLINE (old_result)
1641 |= DECL_INLINE (new_result);
1642 DECL_DECLARED_INLINE_P (old_result)
1643 |= DECL_DECLARED_INLINE_P (new_result);
1644 check_redeclaration_exception_specification (newdecl, olddecl);
1647 /* If the new declaration is a definition, update the file and
1648 line information on the declaration, and also make
1649 the old declaration the same definition. */
1650 if (DECL_INITIAL (old_result) == NULL_TREE
1651 && DECL_INITIAL (new_result) != NULL_TREE)
1653 DECL_SOURCE_LOCATION (olddecl)
1654 = DECL_SOURCE_LOCATION (old_result)
1655 = DECL_SOURCE_LOCATION (newdecl);
1656 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1657 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1658 DECL_ARGUMENTS (old_result)
1659 = DECL_ARGUMENTS (new_result);
1667 /* Automatically handles default parameters. */
1668 tree oldtype = TREE_TYPE (olddecl);
1671 /* Merge the data types specified in the two decls. */
1672 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1674 /* If merge_types produces a non-typedef type, just use the old type. */
1675 if (TREE_CODE (newdecl) == TYPE_DECL
1676 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1679 if (TREE_CODE (newdecl) == VAR_DECL)
1681 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1682 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1683 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1684 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1685 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1686 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1688 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1689 if (DECL_LANG_SPECIFIC (olddecl)
1690 && CP_DECL_THREADPRIVATE_P (olddecl))
1692 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1693 if (!DECL_LANG_SPECIFIC (newdecl))
1694 retrofit_lang_decl (newdecl);
1696 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1697 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1701 /* Do this after calling `merge_types' so that default
1702 parameters don't confuse us. */
1703 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1704 check_redeclaration_exception_specification (newdecl, olddecl);
1705 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1707 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1708 check_default_args (newdecl);
1710 /* Lay the type out, unless already done. */
1711 if (! same_type_p (newtype, oldtype)
1712 && TREE_TYPE (newdecl) != error_mark_node
1713 && !(processing_template_decl && uses_template_parms (newdecl)))
1714 layout_type (TREE_TYPE (newdecl));
1716 if ((TREE_CODE (newdecl) == VAR_DECL
1717 || TREE_CODE (newdecl) == PARM_DECL
1718 || TREE_CODE (newdecl) == RESULT_DECL
1719 || TREE_CODE (newdecl) == FIELD_DECL
1720 || TREE_CODE (newdecl) == TYPE_DECL)
1721 && !(processing_template_decl && uses_template_parms (newdecl)))
1722 layout_decl (newdecl, 0);
1724 /* Merge the type qualifiers. */
1725 if (TREE_READONLY (newdecl))
1726 TREE_READONLY (olddecl) = 1;
1727 if (TREE_THIS_VOLATILE (newdecl))
1728 TREE_THIS_VOLATILE (olddecl) = 1;
1729 if (TREE_NOTHROW (newdecl))
1730 TREE_NOTHROW (olddecl) = 1;
1732 /* Merge deprecatedness. */
1733 if (TREE_DEPRECATED (newdecl))
1734 TREE_DEPRECATED (olddecl) = 1;
1736 /* Merge the initialization information. */
1737 if (DECL_INITIAL (newdecl) == NULL_TREE
1738 && DECL_INITIAL (olddecl) != NULL_TREE)
1740 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1741 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1742 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1743 && DECL_LANG_SPECIFIC (newdecl)
1744 && DECL_LANG_SPECIFIC (olddecl))
1746 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1747 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1751 /* Merge the section attribute.
1752 We want to issue an error if the sections conflict but that must be
1753 done later in decl_attributes since we are called before attributes
1755 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1756 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1758 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1760 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1761 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1762 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1763 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1764 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1765 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1766 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1767 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1768 /* Keep the old RTL. */
1769 COPY_DECL_RTL (olddecl, newdecl);
1771 else if (TREE_CODE (newdecl) == VAR_DECL
1772 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1774 /* Keep the old RTL. We cannot keep the old RTL if the old
1775 declaration was for an incomplete object and the new
1776 declaration is not since many attributes of the RTL will
1778 COPY_DECL_RTL (olddecl, newdecl);
1781 /* If cannot merge, then use the new type and qualifiers,
1782 and don't preserve the old rtl. */
1785 /* Clean out any memory we had of the old declaration. */
1786 tree oldstatic = value_member (olddecl, static_aggregates);
1788 TREE_VALUE (oldstatic) = error_mark_node;
1790 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1791 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1792 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1793 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1796 /* Merge the storage class information. */
1797 merge_weak (newdecl, olddecl);
1799 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1800 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1801 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1802 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1803 if (! DECL_EXTERNAL (olddecl))
1804 DECL_EXTERNAL (newdecl) = 0;
1806 new_template = NULL_TREE;
1807 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1809 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1810 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1811 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1812 DECL_TEMPLATE_INSTANTIATED (newdecl)
1813 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1815 /* If the OLDDECL is an instantiation and/or specialization,
1816 then the NEWDECL must be too. But, it may not yet be marked
1817 as such if the caller has created NEWDECL, but has not yet
1818 figured out that it is a redeclaration. */
1819 if (!DECL_USE_TEMPLATE (newdecl))
1820 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1822 /* Don't really know how much of the language-specific
1823 values we should copy from old to new. */
1824 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1825 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1826 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1827 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1828 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1829 if (DECL_TEMPLATE_INFO (newdecl))
1830 new_template = DECL_TI_TEMPLATE (newdecl);
1831 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1832 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1833 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1834 olddecl_friend = DECL_FRIEND_P (olddecl);
1835 hidden_friend = (DECL_ANTICIPATED (olddecl)
1836 && DECL_HIDDEN_FRIEND_P (olddecl)
1837 && newdecl_is_friend);
1839 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1840 if (TREE_CODE (newdecl) == FUNCTION_DECL
1841 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1843 DECL_BEFRIENDING_CLASSES (newdecl)
1844 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1845 DECL_BEFRIENDING_CLASSES (olddecl));
1846 /* DECL_THUNKS is only valid for virtual functions,
1847 otherwise it is a DECL_FRIEND_CONTEXT. */
1848 if (DECL_VIRTUAL_P (newdecl))
1849 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1853 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1855 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1856 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1858 /* If newdecl is not a specialization, then it is not a
1859 template-related function at all. And that means that we
1860 should have exited above, returning 0. */
1861 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1863 if (TREE_USED (olddecl))
1864 /* From [temp.expl.spec]:
1866 If a template, a member template or the member of a class
1867 template is explicitly specialized then that
1868 specialization shall be declared before the first use of
1869 that specialization that would cause an implicit
1870 instantiation to take place, in every translation unit in
1871 which such a use occurs. */
1872 error ("explicit specialization of %qD after first use",
1875 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1877 /* Don't propagate visibility from the template to the
1878 specialization here. We'll do that in determine_visibility if
1880 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1882 /* [temp.expl.spec/14] We don't inline explicit specialization
1883 just because the primary template says so. */
1887 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1888 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1890 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1892 /* If either decl says `inline', this fn is inline, unless
1893 its definition was passed already. */
1894 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1895 DECL_INLINE (olddecl) = 1;
1896 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1898 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1899 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1902 /* Preserve abstractness on cloned [cd]tors. */
1903 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1907 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1908 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1909 COPY_DECL_RTL (newdecl, olddecl);
1911 if (! types_match || new_defines_function)
1913 /* These need to be copied so that the names are available.
1914 Note that if the types do match, we'll preserve inline
1915 info and other bits, but if not, we won't. */
1916 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1917 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1919 if (new_defines_function)
1920 /* If defining a function declared with other language
1921 linkage, use the previously declared language linkage. */
1922 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1923 else if (types_match)
1925 /* If redeclaring a builtin function, and not a definition,
1926 it stays built in. */
1927 if (DECL_BUILT_IN (olddecl))
1929 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1930 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1931 /* If we're keeping the built-in definition, keep the rtl,
1932 regardless of declaration matches. */
1933 COPY_DECL_RTL (olddecl, newdecl);
1936 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1937 /* Don't clear out the arguments if we're redefining a function. */
1938 if (DECL_ARGUMENTS (olddecl))
1939 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1942 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1943 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1945 /* Now preserve various other info from the definition. */
1946 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1947 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1948 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1949 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1951 /* Warn about conflicting visibility specifications. */
1952 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1953 && DECL_VISIBILITY_SPECIFIED (newdecl)
1954 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1956 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1957 "because it", newdecl);
1958 warning (OPT_Wattributes, "%Jconflicts with previous "
1959 "declaration here", olddecl);
1961 /* Choose the declaration which specified visibility. */
1962 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1964 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1965 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1967 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1968 so keep this behavior. */
1969 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1971 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1972 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1975 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1976 with that from NEWDECL below. */
1977 if (DECL_LANG_SPECIFIC (olddecl))
1979 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1980 != DECL_LANG_SPECIFIC (newdecl));
1981 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1984 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1988 function_size = sizeof (struct tree_decl_common);
1990 memcpy ((char *) olddecl + sizeof (struct tree_common),
1991 (char *) newdecl + sizeof (struct tree_common),
1992 function_size - sizeof (struct tree_common));
1994 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1995 (char *) newdecl + sizeof (struct tree_decl_common),
1996 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1998 /* If newdecl is a template instantiation, it is possible that
1999 the following sequence of events has occurred:
2001 o A friend function was declared in a class template. The
2002 class template was instantiated.
2004 o The instantiation of the friend declaration was
2005 recorded on the instantiation list, and is newdecl.
2007 o Later, however, instantiate_class_template called pushdecl
2008 on the newdecl to perform name injection. But, pushdecl in
2009 turn called duplicate_decls when it discovered that another
2010 declaration of a global function with the same name already
2013 o Here, in duplicate_decls, we decided to clobber newdecl.
2015 If we're going to do that, we'd better make sure that
2016 olddecl, and not newdecl, is on the list of
2017 instantiations so that if we try to do the instantiation
2018 again we won't get the clobbered declaration. */
2019 reregister_specialization (newdecl,
2025 size_t size = tree_code_size (TREE_CODE (olddecl));
2026 memcpy ((char *) olddecl + sizeof (struct tree_common),
2027 (char *) newdecl + sizeof (struct tree_common),
2028 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2029 switch (TREE_CODE (olddecl))
2039 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2040 (char *) newdecl + sizeof (struct tree_decl_common),
2041 size - sizeof (struct tree_decl_common)
2042 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2046 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2047 (char *) newdecl + sizeof (struct tree_decl_common),
2048 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2049 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2053 DECL_UID (olddecl) = olddecl_uid;
2055 DECL_FRIEND_P (olddecl) = 1;
2058 DECL_ANTICIPATED (olddecl) = 1;
2059 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2062 /* NEWDECL contains the merged attribute lists.
2063 Update OLDDECL to be the same. */
2064 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2066 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2067 so that encode_section_info has a chance to look at the new decl
2068 flags and attributes. */
2069 if (DECL_RTL_SET_P (olddecl)
2070 && (TREE_CODE (olddecl) == FUNCTION_DECL
2071 || (TREE_CODE (olddecl) == VAR_DECL
2072 && TREE_STATIC (olddecl))))
2073 make_decl_rtl (olddecl);
2075 /* The NEWDECL will no longer be needed. Because every out-of-class
2076 declaration of a member results in a call to duplicate_decls,
2077 freeing these nodes represents in a significant savings. */
2083 /* Return zero if the declaration NEWDECL is valid
2084 when the declaration OLDDECL (assumed to be for the same name)
2085 has already been seen.
2086 Otherwise return an error message format string with a %s
2087 where the identifier should go. */
2090 redeclaration_error_message (tree newdecl, tree olddecl)
2092 if (TREE_CODE (newdecl) == TYPE_DECL)
2094 /* Because C++ can put things into name space for free,
2095 constructs like "typedef struct foo { ... } foo"
2096 would look like an erroneous redeclaration. */
2097 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2100 return "redefinition of %q#D";
2102 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2104 /* If this is a pure function, its olddecl will actually be
2105 the original initialization to `0' (which we force to call
2106 abort()). Don't complain about redefinition in this case. */
2107 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2108 && DECL_INITIAL (olddecl) == NULL_TREE)
2111 /* If both functions come from different namespaces, this is not
2112 a redeclaration - this is a conflict with a used function. */
2113 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2114 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2115 && ! decls_match (olddecl, newdecl))
2116 return "%qD conflicts with used function";
2118 /* We'll complain about linkage mismatches in
2119 warn_extern_redeclared_static. */
2121 /* Defining the same name twice is no good. */
2122 if (DECL_INITIAL (olddecl) != NULL_TREE
2123 && DECL_INITIAL (newdecl) != NULL_TREE)
2125 if (DECL_NAME (olddecl) == NULL_TREE)
2126 return "%q#D not declared in class";
2128 return "redefinition of %q#D";
2132 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2136 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2138 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2139 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2140 return "redefinition of %q#D";
2144 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2145 || (DECL_TEMPLATE_RESULT (newdecl)
2146 == DECL_TEMPLATE_RESULT (olddecl)))
2149 nt = DECL_TEMPLATE_RESULT (newdecl);
2150 if (DECL_TEMPLATE_INFO (nt))
2151 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2152 ot = DECL_TEMPLATE_RESULT (olddecl);
2153 if (DECL_TEMPLATE_INFO (ot))
2154 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2155 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
2156 return "redefinition of %q#D";
2158 /* Core issue #226 (C++0x):
2160 If a friend function template declaration specifies a
2161 default template-argument, that declaration shall be a
2162 definition and shall be the only declaration of the
2163 function template in the translation unit. */
2164 if ((cxx_dialect != cxx98)
2165 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2166 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2167 /*is_primary=*/1, /*is_partial=*/0,
2168 /*is_friend_decl=*/2))
2169 return "redeclaration of friend %q#D may not have default template arguments";
2173 else if (TREE_CODE (newdecl) == VAR_DECL
2174 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2175 && (! DECL_LANG_SPECIFIC (olddecl)
2176 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2177 || DECL_THREAD_LOCAL_P (newdecl)))
2179 /* Only variables can be thread-local, and all declarations must
2180 agree on this property. */
2181 if (DECL_THREAD_LOCAL_P (newdecl))
2182 return "thread-local declaration of %q#D follows "
2183 "non-thread-local declaration";
2185 return "non-thread-local declaration of %q#D follows "
2186 "thread-local declaration";
2188 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2190 /* The objects have been declared at namespace scope. If either
2191 is a member of an anonymous union, then this is an invalid
2192 redeclaration. For example:
2198 if (DECL_ANON_UNION_VAR_P (newdecl)
2199 || DECL_ANON_UNION_VAR_P (olddecl))
2200 return "redeclaration of %q#D";
2201 /* If at least one declaration is a reference, there is no
2202 conflict. For example:
2208 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2210 /* Reject two definitions. */
2211 return "redefinition of %q#D";
2215 /* Objects declared with block scope: */
2216 /* Reject two definitions, and reject a definition
2217 together with an external reference. */
2218 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2219 return "redeclaration of %q#D";
2224 /* Hash and equality functions for the named_label table. */
2227 named_label_entry_hash (const void *data)
2229 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2230 return DECL_UID (ent->label_decl);
2234 named_label_entry_eq (const void *a, const void *b)
2236 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2237 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2238 return ent_a->label_decl == ent_b->label_decl;
2241 /* Create a new label, named ID. */
2244 make_label_decl (tree id, int local_p)
2246 struct named_label_entry *ent;
2250 decl = build_decl (LABEL_DECL, id, void_type_node);
2252 DECL_CONTEXT (decl) = current_function_decl;
2253 DECL_MODE (decl) = VOIDmode;
2254 C_DECLARED_LABEL_FLAG (decl) = local_p;
2256 /* Say where one reference is to the label, for the sake of the
2257 error if it is not defined. */
2258 DECL_SOURCE_LOCATION (decl) = input_location;
2260 /* Record the fact that this identifier is bound to this label. */
2261 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2263 /* Create the label htab for the function on demand. */
2265 named_labels = htab_create_ggc (13, named_label_entry_hash,
2266 named_label_entry_eq, NULL);
2268 /* Record this label on the list of labels used in this function.
2269 We do this before calling make_label_decl so that we get the
2270 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2271 ent = GGC_CNEW (struct named_label_entry);
2272 ent->label_decl = decl;
2274 slot = htab_find_slot (named_labels, ent, INSERT);
2275 gcc_assert (*slot == NULL);
2281 /* Look for a label named ID in the current function. If one cannot
2282 be found, create one. (We keep track of used, but undefined,
2283 labels, and complain about them at the end of a function.) */
2286 lookup_label (tree id)
2290 timevar_push (TV_NAME_LOOKUP);
2291 /* You can't use labels at global scope. */
2292 if (current_function_decl == NULL_TREE)
2294 error ("label %qE referenced outside of any function", id);
2295 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2298 /* See if we've already got this label. */
2299 decl = IDENTIFIER_LABEL_VALUE (id);
2300 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2301 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2303 decl = make_label_decl (id, /*local_p=*/0);
2304 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2307 /* Declare a local label named ID. */
2310 declare_local_label (tree id)
2314 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2315 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2316 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2317 current_binding_level->shadowed_labels);
2318 current_binding_level->shadowed_labels = shadow;
2320 decl = make_label_decl (id, /*local_p=*/1);
2321 TREE_VALUE (shadow) = decl;
2326 /* Returns nonzero if it is ill-formed to jump past the declaration of
2327 DECL. Returns 2 if it's also a real problem. */
2330 decl_jump_unsafe (tree decl)
2332 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2333 || TREE_TYPE (decl) == error_mark_node)
2336 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2337 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2340 if (pod_type_p (TREE_TYPE (decl)))
2343 /* The POD stuff is just pedantry; why should it matter if the class
2344 contains a field of pointer to member type? */
2348 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2351 identify_goto (tree decl, const location_t *locus)
2354 pedwarn ("jump to label %qD", decl);
2356 pedwarn ("jump to case label");
2358 pedwarn ("%H from here", locus);
2361 /* Check that a single previously seen jump to a newly defined label
2362 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2363 the jump context; NAMES are the names in scope in LEVEL at the jump
2364 context; LOCUS is the source position of the jump or 0. Returns
2365 true if all is well. */
2368 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2369 bool exited_omp, const location_t *locus)
2371 struct cp_binding_level *b;
2372 bool identified = false, saw_eh = false, saw_omp = false;
2376 identify_goto (decl, locus);
2377 error (" exits OpenMP structured block");
2378 identified = saw_omp = true;
2381 for (b = current_binding_level; b ; b = b->level_chain)
2383 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2385 for (new_decls = b->names; new_decls != old_decls;
2386 new_decls = TREE_CHAIN (new_decls))
2388 int problem = decl_jump_unsafe (new_decls);
2394 identify_goto (decl, locus);
2398 error (" crosses initialization of %q+#D", new_decls);
2400 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2405 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2409 identify_goto (decl, locus);
2412 if (b->kind == sk_try)
2413 error (" enters try block");
2415 error (" enters catch block");
2418 if (b->kind == sk_omp && !saw_omp)
2422 identify_goto (decl, locus);
2425 error (" enters OpenMP structured block");
2434 check_previous_goto (tree decl, struct named_label_use_entry *use)
2436 check_previous_goto_1 (decl, use->binding_level,
2437 use->names_in_scope, use->in_omp_scope,
2438 &use->o_goto_locus);
2442 check_switch_goto (struct cp_binding_level* level)
2444 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2447 /* Check that a new jump to a label DECL is OK. Called by
2448 finish_goto_stmt. */
2451 check_goto (tree decl)
2453 struct named_label_entry *ent, dummy;
2454 bool saw_catch = false, identified = false;
2457 /* We can't know where a computed goto is jumping.
2458 So we assume that it's OK. */
2459 if (TREE_CODE (decl) != LABEL_DECL)
2462 /* We didn't record any information about this label when we created it,
2463 and there's not much point since it's trivial to analyze as a return. */
2464 if (decl == cdtor_label)
2467 dummy.label_decl = decl;
2468 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2469 gcc_assert (ent != NULL);
2471 /* If the label hasn't been defined yet, defer checking. */
2472 if (! DECL_INITIAL (decl))
2474 struct named_label_use_entry *new_use;
2476 /* Don't bother creating another use if the last goto had the
2477 same data, and will therefore create the same set of errors. */
2479 && ent->uses->names_in_scope == current_binding_level->names)
2482 new_use = GGC_NEW (struct named_label_use_entry);
2483 new_use->binding_level = current_binding_level;
2484 new_use->names_in_scope = current_binding_level->names;
2485 new_use->o_goto_locus = input_location;
2486 new_use->in_omp_scope = false;
2488 new_use->next = ent->uses;
2489 ent->uses = new_use;
2493 if (ent->in_try_scope || ent->in_catch_scope
2494 || ent->in_omp_scope || ent->bad_decls)
2496 pedwarn ("jump to label %q+D", decl);
2497 pedwarn (" from here");
2501 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2503 tree b = TREE_VALUE (bad);
2504 int u = decl_jump_unsafe (b);
2506 if (u > 1 && DECL_ARTIFICIAL (b))
2508 /* Can't skip init of __exception_info. */
2509 error ("%J enters catch block", b);
2513 error (" skips initialization of %q+#D", b);
2515 pedwarn (" enters scope of non-POD %q+#D", b);
2518 if (ent->in_try_scope)
2519 error (" enters try block");
2520 else if (ent->in_catch_scope && !saw_catch)
2521 error (" enters catch block");
2523 if (ent->in_omp_scope)
2524 error (" enters OpenMP structured block");
2525 else if (flag_openmp)
2527 struct cp_binding_level *b;
2528 for (b = current_binding_level; b ; b = b->level_chain)
2530 if (b == ent->binding_level)
2532 if (b->kind == sk_omp)
2536 pedwarn ("jump to label %q+D", decl);
2537 pedwarn (" from here");
2540 error (" exits OpenMP structured block");
2547 /* Check that a return is ok wrt OpenMP structured blocks.
2548 Called by finish_return_stmt. Returns true if all is well. */
2551 check_omp_return (void)
2553 struct cp_binding_level *b;
2554 for (b = current_binding_level; b ; b = b->level_chain)
2555 if (b->kind == sk_omp)
2557 error ("invalid exit from OpenMP structured block");
2563 /* Define a label, specifying the location in the source file.
2564 Return the LABEL_DECL node for the label. */
2567 define_label (location_t location, tree name)
2569 struct named_label_entry *ent, dummy;
2570 struct cp_binding_level *p;
2573 timevar_push (TV_NAME_LOOKUP);
2575 decl = lookup_label (name);
2577 dummy.label_decl = decl;
2578 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2579 gcc_assert (ent != NULL);
2581 /* After labels, make any new cleanups in the function go into their
2582 own new (temporary) binding contour. */
2583 for (p = current_binding_level;
2584 p->kind != sk_function_parms;
2586 p->more_cleanups_ok = 0;
2588 if (name == get_identifier ("wchar_t"))
2589 pedwarn ("label named wchar_t");
2591 if (DECL_INITIAL (decl) != NULL_TREE)
2593 error ("duplicate label %qD", decl);
2594 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2598 struct named_label_use_entry *use;
2600 /* Mark label as having been defined. */
2601 DECL_INITIAL (decl) = error_mark_node;
2602 /* Say where in the source. */
2603 DECL_SOURCE_LOCATION (decl) = location;
2605 ent->binding_level = current_binding_level;
2606 ent->names_in_scope = current_binding_level->names;
2608 for (use = ent->uses; use ; use = use->next)
2609 check_previous_goto (decl, use);
2613 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2618 struct cp_binding_level *level;
2619 struct cp_switch *next;
2620 /* The SWITCH_STMT being built. */
2622 /* A splay-tree mapping the low element of a case range to the high
2623 element, or NULL_TREE if there is no high element. Used to
2624 determine whether or not a new case label duplicates an old case
2625 label. We need a tree, rather than simply a hash table, because
2626 of the GNU case range extension. */
2630 /* A stack of the currently active switch statements. The innermost
2631 switch statement is on the top of the stack. There is no need to
2632 mark the stack for garbage collection because it is only active
2633 during the processing of the body of a function, and we never
2634 collect at that point. */
2636 static struct cp_switch *switch_stack;
2638 /* Called right after a switch-statement condition is parsed.
2639 SWITCH_STMT is the switch statement being parsed. */
2642 push_switch (tree switch_stmt)
2644 struct cp_switch *p = XNEW (struct cp_switch);
2645 p->level = current_binding_level;
2646 p->next = switch_stack;
2647 p->switch_stmt = switch_stmt;
2648 p->cases = splay_tree_new (case_compare, NULL, NULL);
2655 struct cp_switch *cs = switch_stack;
2656 location_t switch_location;
2658 /* Emit warnings as needed. */
2659 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2660 switch_location = EXPR_LOCATION (cs->switch_stmt);
2662 switch_location = input_location;
2663 if (!processing_template_decl)
2664 c_do_switch_warnings (cs->cases, switch_location,
2665 SWITCH_STMT_TYPE (cs->switch_stmt),
2666 SWITCH_STMT_COND (cs->switch_stmt));
2668 splay_tree_delete (cs->cases);
2669 switch_stack = switch_stack->next;
2673 /* Note that we've seen a definition of a case label, and complain if this
2674 is a bad place for one. */
2677 finish_case_label (tree low_value, tree high_value)
2680 struct cp_binding_level *p;
2682 if (processing_template_decl)
2686 /* For templates, just add the case label; we'll do semantic
2687 analysis at instantiation-time. */
2688 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2689 return add_stmt (build_case_label (low_value, high_value, label));
2692 /* Find the condition on which this switch statement depends. */
2693 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2694 if (cond && TREE_CODE (cond) == TREE_LIST)
2695 cond = TREE_VALUE (cond);
2697 if (!check_switch_goto (switch_stack->level))
2698 return error_mark_node;
2700 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2701 low_value, high_value);
2703 /* After labels, make any new cleanups in the function go into their
2704 own new (temporary) binding contour. */
2705 for (p = current_binding_level;
2706 p->kind != sk_function_parms;
2708 p->more_cleanups_ok = 0;
2713 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2716 typename_hash (const void* k)
2721 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2722 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2727 typedef struct typename_info {
2735 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2736 really of type `typename_info*' */
2739 typename_compare (const void * k1, const void * k2)
2742 const typename_info *t2;
2745 t2 = (const typename_info *) k2;
2747 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2748 && TYPE_CONTEXT (t1) == t2->scope
2749 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2750 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2751 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2754 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2755 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2757 Returns the new TYPENAME_TYPE. */
2759 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2762 build_typename_type (tree context, tree name, tree fullname,
2763 enum tag_types tag_type)
2771 if (typename_htab == NULL)
2772 typename_htab = htab_create_ggc (61, &typename_hash,
2773 &typename_compare, NULL);
2775 ti.scope = FROB_CONTEXT (context);
2777 ti.template_id = fullname;
2778 ti.enum_p = tag_type == enum_type;
2779 ti.class_p = (tag_type == class_type
2780 || tag_type == record_type
2781 || tag_type == union_type);
2782 hash = (htab_hash_pointer (ti.scope)
2783 ^ htab_hash_pointer (ti.name));
2785 /* See if we already have this type. */
2786 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2791 /* Build the TYPENAME_TYPE. */
2792 t = make_aggr_type (TYPENAME_TYPE);
2793 TYPE_CONTEXT (t) = ti.scope;
2794 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2795 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2796 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2798 /* Build the corresponding TYPE_DECL. */
2799 d = build_decl (TYPE_DECL, name, t);
2800 TYPE_NAME (TREE_TYPE (d)) = d;
2801 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2802 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2803 DECL_ARTIFICIAL (d) = 1;
2805 /* Store it in the hash table. */
2808 /* TYPENAME_TYPEs must always be compared structurally, because
2809 they may or may not resolve down to another type depending on
2810 the currently open classes. */
2811 SET_TYPE_STRUCTURAL_EQUALITY (t);
2817 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2818 provided to name the type. Returns an appropriate type, unless an
2819 error occurs, in which case error_mark_node is returned. If we
2820 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2821 return that, rather than the _TYPE it corresponds to, in other
2822 cases we look through the type decl. If TF_ERROR is set, complain
2823 about errors, otherwise be quiet. */
2826 make_typename_type (tree context, tree name, enum tag_types tag_type,
2827 tsubst_flags_t complain)
2833 if (name == error_mark_node
2834 || context == NULL_TREE
2835 || context == error_mark_node)
2836 return error_mark_node;
2840 if (!(TYPE_LANG_SPECIFIC (name)
2841 && (CLASSTYPE_IS_TEMPLATE (name)
2842 || CLASSTYPE_USE_TEMPLATE (name))))
2843 name = TYPE_IDENTIFIER (name);
2845 /* Create a TEMPLATE_ID_EXPR for the type. */
2846 name = build_nt (TEMPLATE_ID_EXPR,
2847 CLASSTYPE_TI_TEMPLATE (name),
2848 CLASSTYPE_TI_ARGS (name));
2850 else if (TREE_CODE (name) == TYPE_DECL)
2851 name = DECL_NAME (name);
2855 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2857 name = TREE_OPERAND (name, 0);
2858 if (TREE_CODE (name) == TEMPLATE_DECL)
2859 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2860 else if (TREE_CODE (name) == OVERLOAD)
2862 error ("%qD is not a type", name);
2863 return error_mark_node;
2866 if (TREE_CODE (name) == TEMPLATE_DECL)
2868 error ("%qD used without template parameters", name);
2869 return error_mark_node;
2871 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2872 gcc_assert (TYPE_P (context));
2874 /* When the CONTEXT is a dependent type, NAME could refer to a
2875 dependent base class of CONTEXT. So we cannot peek inside it,
2876 even if CONTEXT is a currently open scope. */
2877 if (dependent_type_p (context))
2878 return build_typename_type (context, name, fullname, tag_type);
2880 if (!IS_AGGR_TYPE (context))
2882 if (complain & tf_error)
2883 error ("%q#T is not a class", context);
2884 return error_mark_node;
2887 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2889 /* We should only set WANT_TYPE when we're a nested typename type.
2890 Then we can give better diagnostics if we find a non-type. */
2891 t = lookup_field (context, name, 0, /*want_type=*/true);
2894 if (complain & tf_error)
2895 error (want_template ? "no class template named %q#T in %q#T"
2896 : "no type named %q#T in %q#T", name, context);
2897 return error_mark_node;
2900 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
2902 if (complain & tf_error)
2903 error ("%<typename %T::%D%> names %q#T, which is not a class template",
2905 return error_mark_node;
2907 if (!want_template && TREE_CODE (t) != TYPE_DECL)
2909 if (complain & tf_error)
2910 error ("%<typename %T::%D%> names %q#T, which is not a type",
2912 return error_mark_node;
2915 if (complain & tf_error)
2916 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
2919 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
2921 /*entering_scope=*/0,
2922 tf_warning_or_error | tf_user);
2924 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2930 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2931 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2932 in which case error_mark_node is returned.
2934 If PARM_LIST is non-NULL, also make sure that the template parameter
2935 list of TEMPLATE_DECL matches.
2937 If COMPLAIN zero, don't complain about any errors that occur. */
2940 make_unbound_class_template (tree context, tree name, tree parm_list,
2941 tsubst_flags_t complain)
2947 name = TYPE_IDENTIFIER (name);
2948 else if (DECL_P (name))
2949 name = DECL_NAME (name);
2950 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2952 if (!dependent_type_p (context)
2953 || currently_open_class (context))
2955 tree tmpl = NULL_TREE;
2957 if (IS_AGGR_TYPE (context))
2958 tmpl = lookup_field (context, name, 0, false);
2960 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2962 if (complain & tf_error)
2963 error ("no class template named %q#T in %q#T", name, context);
2964 return error_mark_node;
2968 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2970 if (complain & tf_error)
2972 error ("template parameters do not match template");
2973 error ("%q+D declared here", tmpl);
2975 return error_mark_node;
2978 if (complain & tf_error)
2979 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
2984 /* Build the UNBOUND_CLASS_TEMPLATE. */
2985 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2986 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2987 TREE_TYPE (t) = NULL_TREE;
2988 SET_TYPE_STRUCTURAL_EQUALITY (t);
2990 /* Build the corresponding TEMPLATE_DECL. */
2991 d = build_decl (TEMPLATE_DECL, name, t);
2992 TYPE_NAME (TREE_TYPE (d)) = d;
2993 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2994 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2995 DECL_ARTIFICIAL (d) = 1;
2996 DECL_TEMPLATE_PARMS (d) = parm_list;
3003 /* Push the declarations of builtin types into the namespace.
3004 RID_INDEX is the index of the builtin type in the array
3005 RID_POINTERS. NAME is the name used when looking up the builtin
3006 type. TYPE is the _TYPE node for the builtin type. */
3009 record_builtin_type (enum rid rid_index,
3013 tree rname = NULL_TREE, tname = NULL_TREE;
3014 tree tdecl = NULL_TREE;
3016 if ((int) rid_index < (int) RID_MAX)
3017 rname = ridpointers[(int) rid_index];
3019 tname = get_identifier (name);
3021 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3022 eliminated. Built-in types should not be looked up name; their
3023 names are keywords that the parser can recognize. However, there
3024 is code in c-common.c that uses identifier_global_value to look
3025 up built-in types by name. */
3028 tdecl = build_decl (TYPE_DECL, tname, type);
3029 DECL_ARTIFICIAL (tdecl) = 1;
3030 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3036 tdecl = build_decl (TYPE_DECL, rname, type);
3037 DECL_ARTIFICIAL (tdecl) = 1;
3039 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3042 if (!TYPE_NAME (type))
3043 TYPE_NAME (type) = tdecl;
3046 debug_hooks->type_decl (tdecl, 0);
3049 /* Record one of the standard Java types.
3050 * Declare it as having the given NAME.
3051 * If SIZE > 0, it is the size of one of the integral types;
3052 * otherwise it is the negative of the size of one of the other types. */
3055 record_builtin_java_type (const char* name, int size)
3059 type = make_signed_type (size);
3060 else if (size > -32)
3061 { /* "__java_char" or ""__java_boolean". */
3062 type = make_unsigned_type (-size);
3063 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3066 { /* "__java_float" or ""__java_double". */
3067 type = make_node (REAL_TYPE);
3068 TYPE_PRECISION (type) = - size;
3071 record_builtin_type (RID_MAX, name, type);
3072 decl = TYPE_NAME (type);
3074 /* Suppress generate debug symbol entries for these types,
3075 since for normal C++ they are just clutter.
3076 However, push_lang_context undoes this if extern "Java" is seen. */
3077 DECL_IGNORED_P (decl) = 1;
3079 TYPE_FOR_JAVA (type) = 1;
3083 /* Push a type into the namespace so that the back ends ignore it. */
3086 record_unknown_type (tree type, const char* name)
3088 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3089 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3090 DECL_IGNORED_P (decl) = 1;
3091 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3092 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3093 TYPE_ALIGN (type) = 1;
3094 TYPE_USER_ALIGN (type) = 0;
3095 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3098 /* A string for which we should create an IDENTIFIER_NODE at
3101 typedef struct predefined_identifier
3103 /* The name of the identifier. */
3104 const char *const name;
3105 /* The place where the IDENTIFIER_NODE should be stored. */
3107 /* Nonzero if this is the name of a constructor or destructor. */
3108 const int ctor_or_dtor_p;
3109 } predefined_identifier;
3111 /* Create all the predefined identifiers. */
3114 initialize_predefined_identifiers (void)
3116 const predefined_identifier *pid;
3118 /* A table of identifiers to create at startup. */
3119 static const predefined_identifier predefined_identifiers[] = {
3120 { "C++", &lang_name_cplusplus, 0 },
3121 { "C", &lang_name_c, 0 },
3122 { "Java", &lang_name_java, 0 },
3123 /* Some of these names have a trailing space so that it is
3124 impossible for them to conflict with names written by users. */
3125 { "__ct ", &ctor_identifier, 1 },
3126 { "__base_ctor ", &base_ctor_identifier, 1 },
3127 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3128 { "__dt ", &dtor_identifier, 1 },
3129 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3130 { "__base_dtor ", &base_dtor_identifier, 1 },
3131 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3132 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3133 { "nelts", &nelts_identifier, 0 },
3134 { THIS_NAME, &this_identifier, 0 },
3135 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3136 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3137 { "_vptr", &vptr_identifier, 0 },
3138 { "__vtt_parm", &vtt_parm_identifier, 0 },
3139 { "::", &global_scope_name, 0 },
3140 { "std", &std_identifier, 0 },
3144 for (pid = predefined_identifiers; pid->name; ++pid)
3146 *pid->node = get_identifier (pid->name);
3147 if (pid->ctor_or_dtor_p)
3148 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3152 /* Create the predefined scalar types of C,
3153 and some nodes representing standard constants (0, 1, (void *)0).
3154 Initialize the global binding level.
3155 Make definitions for built-in primitive functions. */
3158 cxx_init_decl_processing (void)
3161 tree void_ftype_ptr;
3163 build_common_tree_nodes (flag_signed_char, false);
3165 /* Create all the identifiers we need. */
3166 initialize_predefined_identifiers ();
3168 /* Create the global variables. */
3169 push_to_top_level ();
3171 current_function_decl = NULL_TREE;
3172 current_binding_level = NULL;
3173 /* Enter the global namespace. */
3174 gcc_assert (global_namespace == NULL_TREE);
3175 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3177 TREE_PUBLIC (global_namespace) = 1;
3178 begin_scope (sk_namespace, global_namespace);
3180 current_lang_name = NULL_TREE;
3182 if (flag_visibility_ms_compat)
3183 default_visibility = VISIBILITY_HIDDEN;
3185 /* Force minimum function alignment if using the least significant
3186 bit of function pointers to store the virtual bit. */
3187 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
3188 && force_align_functions_log < 1)
3189 force_align_functions_log = 1;
3192 current_lang_name = lang_name_c;
3194 /* Create the `std' namespace. */
3195 push_namespace (std_identifier);
3196 std_node = current_namespace;
3199 c_common_nodes_and_builtins ();
3201 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3202 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3203 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3204 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3205 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3206 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3207 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3208 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3210 integer_two_node = build_int_cst (NULL_TREE, 2);
3211 integer_three_node = build_int_cst (NULL_TREE, 3);
3213 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3214 truthvalue_type_node = boolean_type_node;
3215 truthvalue_false_node = boolean_false_node;
3216 truthvalue_true_node = boolean_true_node;
3218 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3221 record_builtin_type (RID_MAX, NULL, string_type_node);
3224 delta_type_node = ptrdiff_type_node;
3225 vtable_index_type = ptrdiff_type_node;
3227 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3228 void_ftype = build_function_type (void_type_node, void_list_node);
3229 void_ftype_ptr = build_function_type (void_type_node,
3230 tree_cons (NULL_TREE,
3234 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3236 /* C++ extensions */
3238 unknown_type_node = make_node (UNKNOWN_TYPE);
3239 record_unknown_type (unknown_type_node, "unknown type");
3241 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3242 TREE_TYPE (unknown_type_node) = unknown_type_node;
3244 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3246 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3247 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3250 /* Make sure we get a unique function type, so we can give
3251 its pointer type a name. (This wins for gdb.) */
3252 tree vfunc_type = make_node (FUNCTION_TYPE);
3253 TREE_TYPE (vfunc_type) = integer_type_node;
3254 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3255 layout_type (vfunc_type);
3257 vtable_entry_type = build_pointer_type (vfunc_type);
3259 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3262 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3263 layout_type (vtbl_type_node);
3264 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3265 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3266 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3267 layout_type (vtbl_ptr_type_node);
3268 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3270 push_namespace (get_identifier ("__cxxabiv1"));
3271 abi_node = current_namespace;
3274 global_type_node = make_node (LANG_TYPE);
3275 record_unknown_type (global_type_node, "global type");
3278 current_lang_name = lang_name_cplusplus;
3282 tree bad_alloc_type_node;
3283 tree bad_alloc_decl;
3284 tree newtype, deltype;
3285 tree ptr_ftype_sizetype;
3287 push_namespace (std_identifier);
3288 bad_alloc_id = get_identifier ("bad_alloc");
3289 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3290 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3292 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3293 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3294 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3298 = build_function_type (ptr_type_node,
3299 tree_cons (NULL_TREE,
3302 newtype = build_exception_variant
3303 (ptr_ftype_sizetype, add_exception_specifier
3304 (NULL_TREE, bad_alloc_type_node, -1));
3305 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3306 push_cp_library_fn (NEW_EXPR, newtype);
3307 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3308 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3309 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3313 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3315 /* Perform other language dependent initializations. */
3316 init_class_processing ();
3317 init_rtti_processing ();
3319 if (flag_exceptions)
3320 init_exception_processing ();
3322 if (! supports_one_only ())
3325 make_fname_decl = cp_make_fname_decl;
3326 start_fname_decls ();
3328 /* Show we use EH for cleanups. */
3329 if (flag_exceptions)
3330 using_eh_for_cleanups ();
3333 /* Generate an initializer for a function naming variable from
3334 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3335 filled in with the type of the init. */
3338 cp_fname_init (const char* name, tree *type_p)
3340 tree domain = NULL_TREE;
3342 tree init = NULL_TREE;
3347 length = strlen (name);
3348 domain = build_index_type (size_int (length));
3349 init = build_string (length + 1, name);
3352 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3353 type = build_cplus_array_type (type, domain);
3358 TREE_TYPE (init) = type;
3360 init = error_mark_node;
3365 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3366 decl, NAME is the initialization string and TYPE_DEP indicates whether
3367 NAME depended on the type of the function. We make use of that to detect
3368 __PRETTY_FUNCTION__ inside a template fn. This is being done
3369 lazily at the point of first use, so we mustn't push the decl now. */
3372 cp_make_fname_decl (tree id, int type_dep)
3374 const char *const name = (type_dep && processing_template_decl
3375 ? NULL : fname_as_string (type_dep));
3377 tree init = cp_fname_init (name, &type);
3378 tree decl = build_decl (VAR_DECL, id, type);
3381 free ((char *) name);
3383 /* As we're using pushdecl_with_scope, we must set the context. */
3384 DECL_CONTEXT (decl) = current_function_decl;
3385 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3387 TREE_STATIC (decl) = 1;
3388 TREE_READONLY (decl) = 1;
3389 DECL_ARTIFICIAL (decl) = 1;
3391 TREE_USED (decl) = 1;
3393 if (current_function_decl)
3395 struct cp_binding_level *b = current_binding_level;
3396 while (b->level_chain->kind != sk_function_parms)
3398 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3399 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3400 LOOKUP_ONLYCONVERTING);
3403 pushdecl_top_level_and_finish (decl, init);
3409 builtin_function_1 (tree decl, tree context)
3411 tree id = DECL_NAME (decl);
3412 const char *name = IDENTIFIER_POINTER (id);
3414 retrofit_lang_decl (decl);
3416 /* All nesting of C++ functions is lexical; there is never a "static
3417 chain" in the sense of GNU C nested functions. */
3418 DECL_NO_STATIC_CHAIN (decl) = 1;
3420 DECL_ARTIFICIAL (decl) = 1;
3421 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3422 SET_DECL_LANGUAGE (decl, lang_c);
3423 /* Runtime library routines are, by definition, available in an
3424 external shared object. */
3425 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3426 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3428 DECL_CONTEXT (decl) = context;
3432 /* A function in the user's namespace should have an explicit
3433 declaration before it is used. Mark the built-in function as
3434 anticipated but not actually declared. */
3435 if (name[0] != '_' || name[1] != '_')
3436 DECL_ANTICIPATED (decl) = 1;
3442 cxx_builtin_function (tree decl)
3444 tree id = DECL_NAME (decl);
3445 const char *name = IDENTIFIER_POINTER (id);
3446 /* All builtins that don't begin with an '_' should additionally
3447 go in the 'std' namespace. */
3450 tree decl2 = copy_node(decl);
3451 push_namespace (std_identifier);
3452 builtin_function_1 (decl2, std_node);
3456 return builtin_function_1 (decl, NULL_TREE);
3459 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3460 function. Not called directly. */
3463 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3465 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3466 DECL_EXTERNAL (fn) = 1;
3467 TREE_PUBLIC (fn) = 1;
3468 DECL_ARTIFICIAL (fn) = 1;
3469 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3470 SET_DECL_LANGUAGE (fn, lang_c);
3471 /* Runtime library routines are, by definition, available in an
3472 external shared object. */
3473 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3474 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3478 /* Returns the _DECL for a library function with C linkage.
3479 We assume that such functions never throw; if this is incorrect,
3480 callers should unset TREE_NOTHROW. */
3483 build_library_fn (tree name, tree type)
3485 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3486 TREE_NOTHROW (fn) = 1;
3490 /* Returns the _DECL for a library function with C++ linkage. */
3493 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3495 tree fn = build_library_fn_1 (name, operator_code, type);
3496 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3497 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3498 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3502 /* Like build_library_fn, but takes a C string instead of an
3506 build_library_fn_ptr (const char* name, tree type)
3508 return build_library_fn (get_identifier (name), type);
3511 /* Like build_cp_library_fn, but takes a C string instead of an
3515 build_cp_library_fn_ptr (const char* name, tree type)
3517 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3520 /* Like build_library_fn, but also pushes the function so that we will
3521 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3524 push_library_fn (tree name, tree type)
3526 tree fn = build_library_fn (name, type);
3527 pushdecl_top_level (fn);
3531 /* Like build_cp_library_fn, but also pushes the function so that it
3532 will be found by normal lookup. */
3535 push_cp_library_fn (enum tree_code operator_code, tree type)
3537 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3544 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3548 push_void_library_fn (tree name, tree parmtypes)
3550 tree type = build_function_type (void_type_node, parmtypes);
3551 return push_library_fn (name, type);
3554 /* Like push_library_fn, but also note that this function throws
3555 and does not return. Used for __throw_foo and the like. */
3558 push_throw_library_fn (tree name, tree type)
3560 tree fn = push_library_fn (name, type);
3561 TREE_THIS_VOLATILE (fn) = 1;
3562 TREE_NOTHROW (fn) = 0;
3566 /* When we call finish_struct for an anonymous union, we create
3567 default copy constructors and such. But, an anonymous union
3568 shouldn't have such things; this function undoes the damage to the
3569 anonymous union type T.
3571 (The reason that we create the synthesized methods is that we don't
3572 distinguish `union { int i; }' from `typedef union { int i; } U'.
3573 The first is an anonymous union; the second is just an ordinary
3577 fixup_anonymous_aggr (tree t)
3581 /* Wipe out memory of synthesized methods. */
3582 TYPE_HAS_CONSTRUCTOR (t) = 0;
3583 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3584 TYPE_HAS_INIT_REF (t) = 0;
3585 TYPE_HAS_CONST_INIT_REF (t) = 0;
3586 TYPE_HAS_ASSIGN_REF (t) = 0;
3587 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3589 /* Splice the implicitly generated functions out of the TYPE_METHODS
3591 q = &TYPE_METHODS (t);
3594 if (DECL_ARTIFICIAL (*q))
3595 *q = TREE_CHAIN (*q);
3597 q = &TREE_CHAIN (*q);
3600 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3601 if (TYPE_METHODS (t))
3602 error ("%Jan anonymous union cannot have function members",
3603 TYPE_MAIN_DECL (t));
3605 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3606 assignment operators (because they cannot have these methods themselves).
3607 For anonymous unions this is already checked because they are not allowed
3608 in any union, otherwise we have to check it. */
3609 if (TREE_CODE (t) != UNION_TYPE)
3613 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3614 if (TREE_CODE (field) == FIELD_DECL)
3616 type = TREE_TYPE (field);
3617 if (CLASS_TYPE_P (type))
3619 if (TYPE_NEEDS_CONSTRUCTING (type))
3620 error ("member %q+#D with constructor not allowed "
3621 "in anonymous aggregate", field);
3622 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3623 error ("member %q+#D with destructor not allowed "
3624 "in anonymous aggregate", field);
3625 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3626 error ("member %q+#D with copy assignment operator "
3627 "not allowed in anonymous aggregate", field);
3633 /* Make sure that a declaration with no declarator is well-formed, i.e.
3634 just declares a tagged type or anonymous union.
3636 Returns the type declared; or NULL_TREE if none. */
3639 check_tag_decl (cp_decl_specifier_seq *declspecs)
3641 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3642 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3643 /* If a class, struct, or enum type is declared by the DECLSPECS
3644 (i.e, if a class-specifier, enum-specifier, or non-typename
3645 elaborated-type-specifier appears in the DECLSPECS),
3646 DECLARED_TYPE is set to the corresponding type. */
3647 tree declared_type = NULL_TREE;
3648 bool error_p = false;
3650 if (declspecs->multiple_types_p)
3651 error ("multiple types in one declaration");
3652 else if (declspecs->redefined_builtin_type)
3654 if (!in_system_header)
3655 pedwarn ("redeclaration of C++ built-in type %qT",
3656 declspecs->redefined_builtin_type);
3661 && TYPE_P (declspecs->type)
3662 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3663 && IS_AGGR_TYPE (declspecs->type))
3664 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3665 declared_type = declspecs->type;
3666 else if (declspecs->type == error_mark_node)
3668 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3669 pedwarn ("declaration does not declare anything");
3670 /* Check for an anonymous union. */
3671 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3672 && TYPE_ANONYMOUS_P (declared_type))
3674 /* 7/3 In a simple-declaration, the optional init-declarator-list
3675 can be omitted only when declaring a class (clause 9) or
3676 enumeration (7.2), that is, when the decl-specifier-seq contains
3677 either a class-specifier, an elaborated-type-specifier with
3678 a class-key (9.1), or an enum-specifier. In these cases and
3679 whenever a class-specifier or enum-specifier is present in the
3680 decl-specifier-seq, the identifiers in these specifiers are among
3681 the names being declared by the declaration (as class-name,
3682 enum-names, or enumerators, depending on the syntax). In such
3683 cases, and except for the declaration of an unnamed bit-field (9.6),
3684 the decl-specifier-seq shall introduce one or more names into the
3685 program, or shall redeclare a name introduced by a previous
3686 declaration. [Example:
3687 enum { }; // ill-formed
3688 typedef class { }; // ill-formed
3692 error ("missing type-name in typedef-declaration");
3695 /* Anonymous unions are objects, so they can have specifiers. */;
3696 SET_ANON_AGGR_TYPE_P (declared_type);
3698 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3699 && !in_system_header)
3700 pedwarn ("ISO C++ prohibits anonymous structs");
3705 if (declspecs->specs[(int)ds_inline]
3706 || declspecs->specs[(int)ds_virtual])
3707 error ("%qs can only be specified for functions",
3708 declspecs->specs[(int)ds_inline]
3709 ? "inline" : "virtual");
3711 && (!current_class_type
3712 || current_scope () != current_class_type))
3713 error ("%<friend%> can only be specified inside a class");
3714 else if (declspecs->specs[(int)ds_explicit])
3715 error ("%<explicit%> can only be specified for constructors");
3716 else if (declspecs->storage_class)
3717 error ("a storage class can only be specified for objects "
3719 else if (declspecs->specs[(int)ds_const]
3720 || declspecs->specs[(int)ds_volatile]
3721 || declspecs->specs[(int)ds_restrict]
3722 || declspecs->specs[(int)ds_thread])
3723 error ("qualifiers can only be specified for objects "
3725 else if (saw_typedef)
3726 warning (0, "%<typedef%> was ignored in this declaration");
3729 return declared_type;
3732 /* Called when a declaration is seen that contains no names to declare.
3733 If its type is a reference to a structure, union or enum inherited
3734 from a containing scope, shadow that tag name for the current scope
3735 with a forward reference.
3736 If its type defines a new named structure or union
3737 or defines an enum, it is valid but we need not do anything here.
3738 Otherwise, it is an error.
3740 C++: may have to grok the declspecs to learn about static,
3741 complain for anonymous unions.
3743 Returns the TYPE declared -- or NULL_TREE if none. */
3746 shadow_tag (cp_decl_specifier_seq *declspecs)
3748 tree t = check_tag_decl (declspecs);
3753 if (declspecs->attributes)
3755 warning (0, "attribute ignored in declaration of %q+#T", t);
3756 warning (0, "attribute for %q+#T must follow the %qs keyword",
3757 t, class_key_or_enum_as_string (t));
3761 if (maybe_process_partial_specialization (t) == error_mark_node)
3764 /* This is where the variables in an anonymous union are
3765 declared. An anonymous union declaration looks like:
3767 because there is no declarator after the union, the parser
3768 sends that declaration here. */
3769 if (ANON_AGGR_TYPE_P (t))
3771 fixup_anonymous_aggr (t);
3773 if (TYPE_FIELDS (t))
3775 tree decl = grokdeclarator (/*declarator=*/NULL,
3776 declspecs, NORMAL, 0, NULL);
3777 finish_anon_union (decl);
3784 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3787 groktypename (cp_decl_specifier_seq *type_specifiers,
3788 const cp_declarator *declarator)
3792 attrs = type_specifiers->attributes;
3793 type_specifiers->attributes = NULL_TREE;
3794 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3796 cplus_decl_attributes (&type, attrs, 0);
3800 /* Decode a declarator in an ordinary declaration or data definition.
3801 This is called as soon as the type information and variable name
3802 have been parsed, before parsing the initializer if any.
3803 Here we create the ..._DECL node, fill in its type,
3804 and put it on the list of decls for the current context.
3805 The ..._DECL node is returned as the value.
3807 Exception: for arrays where the length is not specified,
3808 the type is left null, to be filled in by `cp_finish_decl'.
3810 Function definitions do not come here; they go to start_function
3811 instead. However, external and forward declarations of functions
3812 do go through here. Structure field declarations are done by
3813 grokfield and not through here. */
3816 start_decl (const cp_declarator *declarator,
3817 cp_decl_specifier_seq *declspecs,
3820 tree prefix_attributes,
3821 tree *pushed_scope_p)
3828 *pushed_scope_p = NULL_TREE;
3830 /* An object declared as __attribute__((deprecated)) suppresses
3831 warnings of uses of other deprecated items. */
3832 if (lookup_attribute ("deprecated", attributes))
3833 deprecated_state = DEPRECATED_SUPPRESS;
3835 attributes = chainon (attributes, prefix_attributes);
3837 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3840 deprecated_state = DEPRECATED_NORMAL;
3842 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3843 || decl == error_mark_node)
3844 return error_mark_node;
3846 type = TREE_TYPE (decl);
3848 context = DECL_CONTEXT (decl);
3852 *pushed_scope_p = push_scope (context);
3854 /* We are only interested in class contexts, later. */
3855 if (TREE_CODE (context) == NAMESPACE_DECL)
3856 context = NULL_TREE;
3860 /* Is it valid for this decl to have an initializer at all?
3861 If not, set INITIALIZED to zero, which will indirectly
3862 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3863 switch (TREE_CODE (decl))
3866 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3867 return error_mark_node;
3870 error ("function %q#D is initialized like a variable", decl);
3871 return error_mark_node;
3879 if (! toplevel_bindings_p ()
3880 && DECL_EXTERNAL (decl))
3881 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3883 DECL_EXTERNAL (decl) = 0;
3884 if (toplevel_bindings_p ())
3885 TREE_STATIC (decl) = 1;
3888 /* Set attributes here so if duplicate decl, will have proper attributes. */
3889 cplus_decl_attributes (&decl, attributes, 0);
3891 /* Dllimported symbols cannot be defined. Static data members (which
3892 can be initialized in-class and dllimported) go through grokfield,
3893 not here, so we don't need to exclude those decls when checking for
3895 if (initialized && DECL_DLLIMPORT_P (decl))
3897 error ("definition of %q#D is marked %<dllimport%>", decl);
3898 DECL_DLLIMPORT_P (decl) = 0;
3901 /* If #pragma weak was used, mark the decl weak now. */
3902 maybe_apply_pragma_weak (decl);
3904 if (TREE_CODE (decl) == FUNCTION_DECL
3905 && DECL_DECLARED_INLINE_P (decl)
3906 && DECL_UNINLINABLE (decl)
3907 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3908 warning (0, "inline function %q+D given attribute noinline", decl);
3910 if (context && COMPLETE_TYPE_P (complete_type (context)))
3912 if (TREE_CODE (decl) == VAR_DECL)
3914 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3915 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3916 error ("%q#D is not a static member of %q#T", decl, context);
3919 if (DECL_CONTEXT (field) != context)
3921 if (!same_type_p (DECL_CONTEXT (field), context))
3922 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3923 "to be defined as %<%T::%D%>",
3924 DECL_CONTEXT (field), DECL_NAME (decl),
3925 context, DECL_NAME (decl));
3926 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3928 if (processing_specialization
3929 && template_class_depth (context) == 0
3930 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3931 error ("template header not allowed in member definition "
3932 "of explicitly specialized class");
3933 /* Static data member are tricky; an in-class initialization
3934 still doesn't provide a definition, so the in-class
3935 declaration will have DECL_EXTERNAL set, but will have an
3936 initialization. Thus, duplicate_decls won't warn
3937 about this situation, and so we check here. */
3938 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
3939 error ("duplicate initialization of %qD", decl);
3940 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3946 tree field = check_classfn (context, decl,
3947 (processing_template_decl
3948 > template_class_depth (context))
3949 ? current_template_parms
3951 if (field && duplicate_decls (decl, field,
3952 /*newdecl_is_friend=*/false))
3956 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3957 DECL_IN_AGGR_P (decl) = 0;
3958 /* Do not mark DECL as an explicit specialization if it was not
3959 already marked as an instantiation; a declaration should
3960 never be marked as a specialization unless we know what
3961 template is being specialized. */
3962 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3964 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3966 /* [temp.expl.spec] An explicit specialization of a static data
3967 member of a template is a definition if the declaration
3968 includes an initializer; otherwise, it is a declaration.
3970 We check for processing_specialization so this only applies
3971 to the new specialization syntax. */
3972 if (!initialized && processing_specialization)
3973 DECL_EXTERNAL (decl) = 1;
3976 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3977 pedwarn ("declaration of %q#D outside of class is not definition",
3981 was_public = TREE_PUBLIC (decl);
3983 /* Enter this declaration into the symbol table. */
3984 tem = maybe_push_decl (decl);
3986 if (processing_template_decl)
3987 tem = push_template_decl (tem);
3988 if (tem == error_mark_node)
3989 return error_mark_node;
3991 /* Tell the back end to use or not use .common as appropriate. If we say
3992 -fconserve-space, we want this to save .data space, at the expense of
3993 wrong semantics. If we say -fno-conserve-space, we want this to
3994 produce errors about redefs; to do this we force variables into the
3996 if (flag_conserve_space
3997 && TREE_CODE (tem) == VAR_DECL
3998 && TREE_PUBLIC (tem)
3999 && !DECL_THREAD_LOCAL_P (tem)
4000 && !have_global_bss_p ())
4001 DECL_COMMON (tem) = 1;
4003 if (TREE_CODE (tem) == VAR_DECL
4004 && DECL_NAMESPACE_SCOPE_P (tem) && !TREE_PUBLIC (tem) && !was_public
4005 && !DECL_THIS_STATIC (tem) && !DECL_ARTIFICIAL (tem))
4007 /* This is a const variable with implicit 'static'. Set
4008 DECL_THIS_STATIC so we can tell it from variables that are
4009 !TREE_PUBLIC because of the anonymous namespace. */
4010 gcc_assert (cp_type_readonly (TREE_TYPE (tem)));
4011 DECL_THIS_STATIC (tem) = 1;
4014 if (!processing_template_decl && TREE_CODE (tem) == VAR_DECL)
4015 start_decl_1 (tem, initialized);
4021 start_decl_1 (tree decl, bool initialized)
4025 gcc_assert (!processing_template_decl);
4027 if (error_operand_p (decl))
4030 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4031 type = TREE_TYPE (decl);
4034 /* Is it valid for this decl to have an initializer at all?
4035 If not, set INITIALIZED to zero, which will indirectly
4036 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4038 /* Don't allow initializations for incomplete types except for
4039 arrays which might be completed by the initialization. */
4040 if (COMPLETE_TYPE_P (complete_type (type)))
4041 ; /* A complete type is ok. */
4042 else if (TREE_CODE (type) != ARRAY_TYPE)
4044 error ("variable %q#D has initializer but incomplete type", decl);
4046 type = TREE_TYPE (decl) = error_mark_node;
4048 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4050 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4051 error ("elements of array %q#D have incomplete type", decl);
4052 /* else we already gave an error in start_decl. */
4056 else if (IS_AGGR_TYPE (type)
4057 && ! DECL_EXTERNAL (decl))
4059 if (!COMPLETE_TYPE_P (complete_type (type)))
4061 error ("aggregate %q#D has incomplete type and cannot be defined",
4063 /* Change the type so that assemble_variable will give
4064 DECL an rtl we can live with: (mem (const_int 0)). */
4065 type = TREE_TYPE (decl) = error_mark_node;
4069 /* If any base type in the hierarchy of TYPE needs a constructor,
4070 then we set initialized to 1. This way any nodes which are
4071 created for the purposes of initializing this aggregate
4072 will live as long as it does. This is necessary for global
4073 aggregates which do not have their initializers processed until
4074 the end of the file. */
4075 initialized = TYPE_NEEDS_CONSTRUCTING (type);
4079 /* Create a new scope to hold this declaration if necessary.
4080 Whether or not a new scope is necessary cannot be determined
4081 until after the type has been completed; if the type is a
4082 specialization of a class template it is not until after
4083 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4084 will be set correctly. */
4085 maybe_push_cleanup_level (type);
4088 /* Handle initialization of references. DECL, TYPE, and INIT have the
4089 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4090 but will be set to a new CLEANUP_STMT if a temporary is created
4091 that must be destroyed subsequently.
4093 Returns an initializer expression to use to initialize DECL, or
4094 NULL if the initialization can be performed statically.
4096 Quotes on semantics can be found in ARM 8.4.3. */
4099 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4103 if (init == NULL_TREE)
4105 if ((DECL_LANG_SPECIFIC (decl) == 0
4106 || DECL_IN_AGGR_P (decl) == 0)
4107 && ! DECL_THIS_EXTERN (decl))
4108 error ("%qD declared as reference but not initialized", decl);
4112 if (TREE_CODE (init) == CONSTRUCTOR)
4114 error ("ISO C++ forbids use of initializer list to "
4115 "initialize reference %qD", decl);
4119 if (TREE_CODE (init) == TREE_LIST)
4120 init = build_x_compound_expr_from_list (init, "initializer");
4122 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4123 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4124 /* Note: default conversion is only called in very special cases. */
4125 init = decay_conversion (init);
4127 /* Convert INIT to the reference type TYPE. This may involve the
4128 creation of a temporary, whose lifetime must be the same as that
4129 of the reference. If so, a DECL_EXPR for the temporary will be
4130 added just after the DECL_EXPR for DECL. That's why we don't set
4131 DECL_INITIAL for local references (instead assigning to them
4132 explicitly); we need to allow the temporary to be initialized
4134 tmp = initialize_reference (type, init, decl, cleanup);
4136 if (tmp == error_mark_node)
4138 else if (tmp == NULL_TREE)
4140 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4144 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4147 DECL_INITIAL (decl) = tmp;
4152 /* Designated initializers in arrays are not supported in GNU C++.
4153 The parser cannot detect this error since it does not know whether
4154 a given brace-enclosed initializer is for a class type or for an
4155 array. This function checks that CE does not use a designated
4156 initializer. If it does, an error is issued. Returns true if CE
4157 is valid, i.e., does not have a designated initializer. */
4160 check_array_designated_initializer (const constructor_elt *ce)
4162 /* Designated initializers for array elements are not supported. */
4165 /* The parser only allows identifiers as designated
4167 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4168 error ("name %qD used in a GNU-style designated "
4169 "initializer for an array", ce->index);
4176 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4177 array until we finish parsing the initializer. If that's the
4178 situation we're in, update DECL accordingly. */
4181 maybe_deduce_size_from_array_init (tree decl, tree init)
4183 tree type = TREE_TYPE (decl);
4185 if (TREE_CODE (type) == ARRAY_TYPE
4186 && TYPE_DOMAIN (type) == NULL_TREE
4187 && TREE_CODE (decl) != TYPE_DECL)
4189 /* do_default is really a C-ism to deal with tentative definitions.
4190 But let's leave it here to ease the eventual merge. */
4191 int do_default = !DECL_EXTERNAL (decl);
4192 tree initializer = init ? init : DECL_INITIAL (decl);
4195 /* Check that there are no designated initializers in INIT, as
4196 those are not supported in GNU C++, and as the middle-end
4197 will crash if presented with a non-numeric designated
4199 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4201 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4202 constructor_elt *ce;
4205 VEC_iterate (constructor_elt, v, i, ce);
4207 if (!check_array_designated_initializer (ce))
4213 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4217 error ("initializer fails to determine size of %qD", decl);
4218 TREE_TYPE (decl) = error_mark_node;
4220 else if (failure == 2)
4224 error ("array size missing in %qD", decl);
4225 TREE_TYPE (decl) = error_mark_node;
4227 /* If a `static' var's size isn't known, make it extern as
4228 well as static, so it does not get allocated. If it's not
4229 `static', then don't mark it extern; finish_incomplete_decl
4230 will give it a default size and it will get allocated. */
4231 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4232 DECL_EXTERNAL (decl) = 1;
4234 else if (failure == 3)
4236 error ("zero-size array %qD", decl);
4237 TREE_TYPE (decl) = error_mark_node;
4241 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4243 layout_decl (decl, 0);
4247 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4248 any appropriate error messages regarding the layout. */
4251 layout_var_decl (tree decl)
4255 type = TREE_TYPE (decl);
4256 if (type == error_mark_node)
4259 /* If we haven't already layed out this declaration, do so now.
4260 Note that we must not call complete type for an external object
4261 because it's type might involve templates that we are not
4262 supposed to instantiate yet. (And it's perfectly valid to say
4263 `extern X x' for some incomplete type `X'.) */
4264 if (!DECL_EXTERNAL (decl))
4265 complete_type (type);
4266 if (!DECL_SIZE (decl)
4267 && TREE_TYPE (decl) != error_mark_node
4268 && (COMPLETE_TYPE_P (type)
4269 || (TREE_CODE (type) == ARRAY_TYPE
4270 && !TYPE_DOMAIN (type)
4271 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4272 layout_decl (decl, 0);
4274 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4276 /* An automatic variable with an incomplete type: that is an error.
4277 Don't talk about array types here, since we took care of that
4278 message in grokdeclarator. */
4279 error ("storage size of %qD isn't known", decl);
4280 TREE_TYPE (decl) = error_mark_node;
4283 /* Keep this code around in case we later want to control debug info
4284 based on whether a type is "used". (jason 1999-11-11) */
4286 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4287 /* Let debugger know it should output info for this type. */
4288 note_debug_info_needed (ttype);
4290 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4291 note_debug_info_needed (DECL_CONTEXT (decl));
4294 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4295 && DECL_SIZE (decl) != NULL_TREE
4296 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4298 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4299 constant_expression_warning (DECL_SIZE (decl));
4301 error ("storage size of %qD isn't constant", decl);
4305 /* If a local static variable is declared in an inline function, or if
4306 we have a weak definition, we must endeavor to create only one
4307 instance of the variable at link-time. */
4310 maybe_commonize_var (tree decl)
4312 /* Static data in a function with comdat linkage also has comdat
4314 if (TREE_STATIC (decl)
4315 /* Don't mess with __FUNCTION__. */
4316 && ! DECL_ARTIFICIAL (decl)
4317 && DECL_FUNCTION_SCOPE_P (decl)
4318 /* Unfortunately, import_export_decl has not always been called
4319 before the function is processed, so we cannot simply check
4321 && (DECL_COMDAT (DECL_CONTEXT (decl))
4322 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4323 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4324 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4328 /* With weak symbols, we simply make the variable COMDAT;
4329 that will cause copies in multiple translations units to
4331 comdat_linkage (decl);
4335 if (DECL_INITIAL (decl) == NULL_TREE
4336 || DECL_INITIAL (decl) == error_mark_node)
4338 /* Without weak symbols, we can use COMMON to merge
4339 uninitialized variables. */
4340 TREE_PUBLIC (decl) = 1;
4341 DECL_COMMON (decl) = 1;
4345 /* While for initialized variables, we must use internal
4346 linkage -- which means that multiple copies will not
4348 TREE_PUBLIC (decl) = 0;
4349 DECL_COMMON (decl) = 0;
4350 warning (0, "sorry: semantics of inline function static "
4351 "data %q+#D are wrong (you'll wind up "
4352 "with multiple copies)", decl);
4353 warning (0, "%J you can work around this by removing "
4359 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4360 /* Set it up again; we might have set DECL_INITIAL since the last
4362 comdat_linkage (decl);
4365 /* Issue an error message if DECL is an uninitialized const variable. */
4368 check_for_uninitialized_const_var (tree decl)
4370 tree type = TREE_TYPE (decl);
4372 /* ``Unless explicitly declared extern, a const object does not have
4373 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4375 if (TREE_CODE (decl) == VAR_DECL
4376 && TREE_CODE (type) != REFERENCE_TYPE
4377 && CP_TYPE_CONST_P (type)
4378 && !TYPE_NEEDS_CONSTRUCTING (type)
4379 && !DECL_INITIAL (decl))
4380 error ("uninitialized const %qD", decl);
4384 /* Structure holding the current initializer being processed by reshape_init.
4385 CUR is a pointer to the current element being processed, END is a pointer
4386 after the last element present in the initializer. */
4387 typedef struct reshape_iterator_t
4389 constructor_elt *cur;
4390 constructor_elt *end;
4393 static tree reshape_init_r (tree, reshape_iter *, bool);
4395 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4396 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4397 initialized. If there are no more such fields, the return value
4401 next_initializable_field (tree field)
4404 && (TREE_CODE (field) != FIELD_DECL
4405 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4406 || DECL_ARTIFICIAL (field)))
4407 field = TREE_CHAIN (field);
4412 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4413 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4414 INTEGER_CST representing the size of the array minus one (the maximum index),
4415 or NULL_TREE if the array was declared without specifying the size. D is
4416 the iterator within the constructor. */
4419 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4422 bool sized_array_p = (max_index != NULL_TREE);
4423 unsigned HOST_WIDE_INT max_index_cst = 0;
4424 unsigned HOST_WIDE_INT index;
4426 /* The initializer for an array is always a CONSTRUCTOR. */
4427 new_init = build_constructor (NULL_TREE, NULL);
4431 /* Minus 1 is used for zero sized arrays. */
4432 if (integer_all_onesp (max_index))
4435 if (host_integerp (max_index, 1))
4436 max_index_cst = tree_low_cst (max_index, 1);
4437 /* sizetype is sign extended, not zero extended. */
4439 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4443 /* Loop until there are no more initializers. */
4445 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4450 check_array_designated_initializer (d->cur);
4451 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4452 if (elt_init == error_mark_node)
4453 return error_mark_node;
4454 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4460 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4461 Parameters are the same of reshape_init_r. */
4464 reshape_init_array (tree type, reshape_iter *d)
4466 tree max_index = NULL_TREE;
4468 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4470 if (TYPE_DOMAIN (type))
4471 max_index = array_type_nelts (type);
4473 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4476 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4477 Parameters are the same of reshape_init_r. */
4480 reshape_init_vector (tree type, reshape_iter *d)
4482 tree max_index = NULL_TREE;
4485 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4487 if (COMPOUND_LITERAL_P (d->cur->value))
4489 tree value = d->cur->value;
4490 if (!same_type_p (TREE_TYPE (value), type))
4492 error ("invalid type %qT as initializer for a vector of type %qT",
4493 TREE_TYPE (d->cur->value), type);
4494 value = error_mark_node;
4500 /* For a vector, the representation type is a struct
4501 containing a single member which is an array of the
4502 appropriate size. */
4503 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4504 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4505 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4507 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4510 /* Subroutine of reshape_init_r, processes the initializers for classes
4511 or union. Parameters are the same of reshape_init_r. */
4514 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4519 gcc_assert (CLASS_TYPE_P (type));
4521 /* The initializer for a class is always a CONSTRUCTOR. */
4522 new_init = build_constructor (NULL_TREE, NULL);
4523 field = next_initializable_field (TYPE_FIELDS (type));
4529 An initializer for an aggregate member that is an
4530 empty class shall have the form of an empty
4531 initializer-list {}. */
4532 if (!first_initializer_p)
4534 error ("initializer for %qT must be brace-enclosed", type);
4535 return error_mark_node;
4540 /* Loop through the initializable fields, gathering initializers. */
4541 while (d->cur != d->end)
4545 /* Handle designated initializers, as an extension. */
4548 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4550 if (!field || TREE_CODE (field) != FIELD_DECL)
4552 error ("%qT has no non-static data member named %qD", type,
4554 return error_mark_node;
4558 /* If we processed all the member of the class, we are done. */
4562 field_init = reshape_init_r (TREE_TYPE (field), d,
4563 /*first_initializer_p=*/false);
4564 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4568 When a union is initialized with a brace-enclosed
4569 initializer, the braces shall only contain an
4570 initializer for the first member of the union. */
4571 if (TREE_CODE (type) == UNION_TYPE)
4574 field = next_initializable_field (TREE_CHAIN (field));
4580 /* Subroutine of reshape_init, which processes a single initializer (part of
4581 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4582 iterator within the CONSTRUCTOR which points to the initializer to process.
4583 FIRST_INITIALIZER_P is true if this is the first initializer of the
4584 CONSTRUCTOR node. */
4587 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4589 tree init = d->cur->value;
4591 /* A non-aggregate type is always initialized with a single
4593 if (!CP_AGGREGATE_TYPE_P (type))
4595 /* It is invalid to initialize a non-aggregate type with a
4596 brace-enclosed initializer.
4597 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4598 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4599 a CONSTRUCTOR (with a record type). */
4600 if (TREE_CODE (init) == CONSTRUCTOR
4601 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4603 error ("braces around scalar initializer for type %qT", type);
4604 init = error_mark_node;
4613 All implicit type conversions (clause _conv_) are considered when
4614 initializing the aggregate member with an initializer from an
4615 initializer-list. If the initializer can initialize a member,
4616 the member is initialized. Otherwise, if the member is itself a
4617 non-empty subaggregate, brace elision is assumed and the
4618 initializer is considered for the initialization of the first
4619 member of the subaggregate. */
4620 if (TREE_CODE (init) != CONSTRUCTOR
4621 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4627 /* [dcl.init.string]
4629 A char array (whether plain char, signed char, or unsigned char)
4630 can be initialized by a string-literal (optionally enclosed in
4631 braces); a wchar_t array can be initialized by a wide
4632 string-literal (optionally enclosed in braces). */
4633 if (TREE_CODE (type) == ARRAY_TYPE
4634 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4636 tree str_init = init;
4638 /* Strip one level of braces if and only if they enclose a single
4639 element (as allowed by [dcl.init.string]). */
4640 if (!first_initializer_p
4641 && TREE_CODE (str_init) == CONSTRUCTOR
4642 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4644 str_init = VEC_index (constructor_elt,
4645 CONSTRUCTOR_ELTS (str_init), 0)->value;
4648 /* If it's a string literal, then it's the initializer for the array
4649 as a whole. Otherwise, continue with normal initialization for
4650 array types (one value per array element). */
4651 if (TREE_CODE (str_init) == STRING_CST)
4658 /* The following cases are about aggregates. If we are not within a full
4659 initializer already, and there is not a CONSTRUCTOR, it means that there
4660 is a missing set of braces (that is, we are processing the case for
4661 which reshape_init exists). */
4662 if (!first_initializer_p)
4664 if (TREE_CODE (init) == CONSTRUCTOR)
4666 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4667 /* There is no need to reshape pointer-to-member function
4668 initializers, as they are always constructed correctly
4669 by the front end. */
4671 else if (COMPOUND_LITERAL_P (init))
4672 /* For a nested compound literal, there is no need to reshape since
4673 brace elision is not allowed. Even if we decided to allow it,
4674 we should add a call to reshape_init in finish_compound_literal,
4675 before calling digest_init, so changing this code would still
4676 not be necessary. */
4677 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4681 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4682 return reshape_init (type, init);
4686 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4690 /* Dispatch to specialized routines. */
4691 if (CLASS_TYPE_P (type))
4692 return reshape_init_class (type, d, first_initializer_p);
4693 else if (TREE_CODE (type) == ARRAY_TYPE)
4694 return reshape_init_array (type, d);
4695 else if (TREE_CODE (type) == VECTOR_TYPE)
4696 return reshape_init_vector (type, d);
4701 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4702 brace-enclosed aggregate initializer.
4704 INIT is the CONSTRUCTOR containing the list of initializers describing
4705 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4706 It may not presently match the shape of the TYPE; for example:
4708 struct S { int a; int b; };
4709 struct S a[] = { 1, 2, 3, 4 };
4711 Here INIT will hold a VEC of four elements, rather than a
4712 VEC of two elements, each itself a VEC of two elements. This
4713 routine transforms INIT from the former form into the latter. The
4714 revised CONSTRUCTOR node is returned. */
4717 reshape_init (tree type, tree init)
4719 VEC(constructor_elt, gc) *v;
4723 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4725 v = CONSTRUCTOR_ELTS (init);
4727 /* An empty constructor does not need reshaping, and it is always a valid
4729 if (VEC_empty (constructor_elt, v))
4732 /* Recurse on this CONSTRUCTOR. */
4733 d.cur = VEC_index (constructor_elt, v, 0);
4734 d.end = d.cur + VEC_length (constructor_elt, v);
4736 new_init = reshape_init_r (type, &d, true);
4737 if (new_init == error_mark_node)
4738 return error_mark_node;
4740 /* Make sure all the element of the constructor were used. Otherwise,
4741 issue an error about exceeding initializers. */
4743 error ("too many initializers for %qT", type);
4748 /* Verify INIT (the initializer for DECL), and record the
4749 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4750 grok_reference_init.
4752 If the return value is non-NULL, it is an expression that must be
4753 evaluated dynamically to initialize DECL. */
4756 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4758 tree type = TREE_TYPE (decl);
4759 tree init_code = NULL;
4761 /* Things that are going to be initialized need to have complete
4763 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4765 if (type == error_mark_node)
4766 /* We will have already complained. */
4769 if (TREE_CODE (type) == ARRAY_TYPE)
4771 tree element_type = TREE_TYPE (type);
4773 /* The array type itself need not be complete, because the
4774 initializer may tell us how many elements are in the array.
4775 But, the elements of the array must be complete. */
4776 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4778 error ("elements of array %q#D have incomplete type", decl);
4781 /* It is not valid to initialize a VLA. */
4783 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4784 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4786 error ("variable-sized object %qD may not be initialized", decl);
4790 else if (!COMPLETE_TYPE_P (type))
4792 error ("%qD has incomplete type", decl);
4793 TREE_TYPE (decl) = error_mark_node;
4797 /* There is no way to make a variable-sized class type in GNU C++. */
4798 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4800 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4802 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4803 if (SCALAR_TYPE_P (type))
4807 error ("scalar object %qD requires one element in initializer",
4809 TREE_TYPE (decl) = error_mark_node;
4813 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4815 /* A non-aggregate that is not a scalar cannot be initialized
4816 via an initializer-list in C++98. */
4817 error ("braces around initializer for non-aggregate type %qT",
4819 TREE_TYPE (decl) = error_mark_node;
4824 if (TREE_CODE (decl) == CONST_DECL)
4826 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4828 DECL_INITIAL (decl) = init;
4830 gcc_assert (init != NULL_TREE);
4833 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4834 init = grok_reference_init (decl, type, init, cleanup);
4837 /* Do not reshape constructors of vectors (they don't need to be
4839 if (TREE_CODE (init) == CONSTRUCTOR
4840 && !COMPOUND_LITERAL_P (init)
4841 && !TREE_TYPE (init)) /* ptrmemfunc */
4843 init = reshape_init (type, init);
4845 if ((*targetm.vector_opaque_p) (type))
4847 error ("opaque vector types cannot be initialized");
4848 init = error_mark_node;
4852 /* If DECL has an array type without a specific bound, deduce the
4853 array size from the initializer. */
4854 maybe_deduce_size_from_array_init (decl, init);
4855 type = TREE_TYPE (decl);
4856 if (type == error_mark_node)
4859 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4861 if (TREE_CODE (type) == ARRAY_TYPE)
4862 goto initialize_aggr;
4863 else if (TREE_CODE (init) == CONSTRUCTOR)
4865 if (TYPE_NON_AGGREGATE_CLASS (type))
4867 error ("%qD must be initialized by constructor, "
4870 init = error_mark_node;
4873 goto dont_use_constructor;
4877 int saved_stmts_are_full_exprs_p;
4880 saved_stmts_are_full_exprs_p = 0;
4881 if (building_stmt_tree ())
4883 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4884 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4886 init = build_aggr_init (decl, init, flags);
4887 if (building_stmt_tree ())
4888 current_stmt_tree ()->stmts_are_full_exprs_p =
4889 saved_stmts_are_full_exprs_p;
4895 dont_use_constructor:
4896 if (TREE_CODE (init) != TREE_VEC)
4898 init_code = store_init_value (decl, init);
4899 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4900 && DECL_INITIAL (decl)
4901 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4902 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4903 warning (0, "array %qD initialized by parenthesized string literal %qE",
4904 decl, DECL_INITIAL (decl));
4909 else if (DECL_EXTERNAL (decl))
4911 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4912 goto initialize_aggr;
4913 else if (IS_AGGR_TYPE (type))
4915 tree core_type = strip_array_types (type);
4917 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4918 error ("structure %qD with uninitialized const members", decl);
4919 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4920 error ("structure %qD with uninitialized reference members", decl);
4922 check_for_uninitialized_const_var (decl);
4925 check_for_uninitialized_const_var (decl);
4927 if (init && init != error_mark_node)
4928 init_code = build2 (INIT_EXPR, type, decl, init);
4933 /* If DECL is not a local variable, give it RTL. */
4936 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4938 int toplev = toplevel_bindings_p ();
4940 const char *filename;
4942 /* Set the DECL_ASSEMBLER_NAME for the object. */
4945 /* The `register' keyword, when used together with an
4946 asm-specification, indicates that the variable should be
4947 placed in a particular register. */
4948 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4950 set_user_assembler_name (decl, asmspec);
4951 DECL_HARD_REGISTER (decl) = 1;
4955 if (TREE_CODE (decl) == FUNCTION_DECL
4956 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4957 set_builtin_user_assembler_name (decl, asmspec);
4958 set_user_assembler_name (decl, asmspec);
4962 /* Handle non-variables up front. */
4963 if (TREE_CODE (decl) != VAR_DECL)
4965 rest_of_decl_compilation (decl, toplev, at_eof);
4969 /* If we see a class member here, it should be a static data
4971 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4973 gcc_assert (TREE_STATIC (decl));
4974 /* An in-class declaration of a static data member should be
4975 external; it is only a declaration, and not a definition. */
4976 if (init == NULL_TREE)
4977 gcc_assert (DECL_EXTERNAL (decl));
4980 /* We don't create any RTL for local variables. */
4981 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4984 /* We defer emission of local statics until the corresponding
4985 DECL_EXPR is expanded. */
4986 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4988 /* We try to defer namespace-scope static constants so that they are
4989 not emitted into the object file unnecessarily. */
4990 filename = input_filename;
4991 if (!DECL_VIRTUAL_P (decl)
4992 && TREE_READONLY (decl)
4993 && DECL_INITIAL (decl) != NULL_TREE
4994 && DECL_INITIAL (decl) != error_mark_node
4996 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4998 && !TREE_PUBLIC (decl))
5000 /* Fool with the linkage of static consts according to #pragma
5002 struct c_fileinfo *finfo = get_fileinfo (filename);
5003 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5005 TREE_PUBLIC (decl) = 1;
5006 DECL_EXTERNAL (decl) = finfo->interface_only;
5011 /* Likewise for template instantiations. */
5012 else if (DECL_LANG_SPECIFIC (decl)
5013 && DECL_IMPLICIT_INSTANTIATION (decl))
5016 /* If we're not deferring, go ahead and assemble the variable. */
5018 rest_of_decl_compilation (decl, toplev, at_eof);
5021 /* Generate code to initialize DECL (a local variable). */
5024 initialize_local_var (tree decl, tree init)
5026 tree type = TREE_TYPE (decl);
5029 gcc_assert (TREE_CODE (decl) == VAR_DECL
5030 || TREE_CODE (decl) == RESULT_DECL);
5031 gcc_assert (!TREE_STATIC (decl));
5033 if (DECL_SIZE (decl) == NULL_TREE)
5035 /* If we used it already as memory, it must stay in memory. */
5036 DECL_INITIAL (decl) = NULL_TREE;
5037 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5040 if (DECL_SIZE (decl) && type != error_mark_node)
5044 /* Compute and store the initial value. */
5045 already_used = TREE_USED (decl) || TREE_USED (type);
5047 /* Perform the initialization. */
5050 int saved_stmts_are_full_exprs_p;
5052 gcc_assert (building_stmt_tree ());
5053 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5054 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5055 finish_expr_stmt (init);
5056 current_stmt_tree ()->stmts_are_full_exprs_p =
5057 saved_stmts_are_full_exprs_p;
5060 /* Set this to 0 so we can tell whether an aggregate which was
5061 initialized was ever used. Don't do this if it has a
5062 destructor, so we don't complain about the 'resource
5063 allocation is initialization' idiom. Now set
5064 attribute((unused)) on types so decls of that type will be
5065 marked used. (see TREE_USED, above.) */
5066 if (TYPE_NEEDS_CONSTRUCTING (type)
5068 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5069 && DECL_NAME (decl))
5070 TREE_USED (decl) = 0;
5071 else if (already_used)
5072 TREE_USED (decl) = 1;
5075 /* Generate a cleanup, if necessary. */
5076 cleanup = cxx_maybe_build_cleanup (decl);
5077 if (DECL_SIZE (decl) && cleanup)
5078 finish_decl_cleanup (decl, cleanup);
5081 /* DECL is a VAR_DECL for a compiler-generated variable with static
5082 storage duration (like a virtual table) whose initializer is a
5083 compile-time constant. INIT must be either a TREE_LIST of values,
5084 or a CONSTRUCTOR. Initialize the variable and provide it to the
5088 initialize_artificial_var (tree decl, tree init)
5090 gcc_assert (DECL_ARTIFICIAL (decl));
5091 if (TREE_CODE (init) == TREE_LIST)
5092 init = build_constructor_from_list (NULL_TREE, init);
5093 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5094 DECL_INITIAL (decl) = init;
5095 DECL_INITIALIZED_P (decl) = 1;
5096 determine_visibility (decl);
5097 layout_var_decl (decl);
5098 maybe_commonize_var (decl);
5099 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5102 /* INIT is the initializer for a variable, as represented by the
5103 parser. Returns true iff INIT is value-dependent. */
5106 value_dependent_init_p (tree init)
5108 if (TREE_CODE (init) == TREE_LIST)
5109 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5110 return any_value_dependent_elements_p (init);
5111 else if (TREE_CODE (init) == CONSTRUCTOR)
5112 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5114 VEC(constructor_elt, gc) *elts;
5118 elts = CONSTRUCTOR_ELTS (init);
5119 nelts = VEC_length (constructor_elt, elts);
5120 for (i = 0; i < nelts; ++i)
5121 if (value_dependent_init_p (VEC_index (constructor_elt,
5126 /* It must be a simple expression, e.g., int i = 3; */
5127 return value_dependent_expression_p (init);
5132 /* Finish processing of a declaration;
5133 install its line number and initial value.
5134 If the length of an array type is not known before,
5135 it must be determined now, from the initial value, or it is an error.
5137 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5138 true, then INIT is an integral constant expression.
5140 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5141 if the (init) syntax was used. */
5144 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5145 tree asmspec_tree, int flags)
5149 const char *asmspec = NULL;
5150 int was_readonly = 0;
5151 bool var_definition_p = false;
5152 int saved_processing_template_decl;
5154 if (decl == error_mark_node)
5159 error ("assignment (not initialization) in declaration");
5163 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5164 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5165 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5167 type = TREE_TYPE (decl);
5168 if (type == error_mark_node)
5171 /* Assume no cleanup is required. */
5172 cleanup = NULL_TREE;
5173 saved_processing_template_decl = processing_template_decl;
5175 /* If a name was specified, get the string. */
5176 if (global_scope_p (current_binding_level))
5177 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5178 if (asmspec_tree && asmspec_tree != error_mark_node)
5179 asmspec = TREE_STRING_POINTER (asmspec_tree);
5181 if (current_class_type
5182 && CP_DECL_CONTEXT (decl) == current_class_type
5183 && TYPE_BEING_DEFINED (current_class_type)
5184 && (DECL_INITIAL (decl) || init))
5185 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5187 if (processing_template_decl)
5189 bool type_dependent_p;
5191 /* Add this declaration to the statement-tree. */
5192 if (at_function_scope_p ())
5193 add_decl_expr (decl);
5195 type_dependent_p = dependent_type_p (type);
5197 if (init && init_const_expr_p)
5199 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5200 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5201 TREE_CONSTANT (decl) = 1;
5204 /* Generally, initializers in templates are expanded when the
5205 template is instantiated. But, if DECL is an integral
5206 constant static data member, then it can be used in future
5207 integral constant expressions, and its value must be
5210 && DECL_CLASS_SCOPE_P (decl)
5211 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5212 && !type_dependent_p
5213 && !value_dependent_init_p (init)))
5216 DECL_INITIAL (decl) = init;
5217 if (TREE_CODE (decl) == VAR_DECL
5218 && !DECL_PRETTY_FUNCTION_P (decl)
5219 && !type_dependent_p)
5220 maybe_deduce_size_from_array_init (decl, init);
5224 init = fold_non_dependent_expr (init);
5225 processing_template_decl = 0;
5228 /* Take care of TYPE_DECLs up front. */
5229 if (TREE_CODE (decl) == TYPE_DECL)
5231 if (type != error_mark_node
5232 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5234 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5235 warning (0, "shadowing previous type declaration of %q#D", decl);
5236 set_identifier_type_value (DECL_NAME (decl), decl);
5239 /* If we have installed this as the canonical typedef for this
5240 type, and that type has not been defined yet, delay emitting
5241 the debug information for it, as we will emit it later. */
5242 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5243 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5244 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5246 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5251 /* A reference will be modified here, as it is initialized. */
5252 if (! DECL_EXTERNAL (decl)
5253 && TREE_READONLY (decl)
5254 && TREE_CODE (type) == REFERENCE_TYPE)
5257 TREE_READONLY (decl) = 0;
5260 if (TREE_CODE (decl) == VAR_DECL)
5262 /* Only PODs can have thread-local storage. Other types may require
5263 various kinds of non-trivial initialization. */
5264 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5265 error ("%qD cannot be thread-local because it has non-POD type %qT",
5266 decl, TREE_TYPE (decl));
5267 /* If this is a local variable that will need a mangled name,
5268 register it now. We must do this before processing the
5269 initializer for the variable, since the initialization might
5270 require a guard variable, and since the mangled name of the
5271 guard variable will depend on the mangled name of this
5273 if (!processing_template_decl
5274 && DECL_FUNCTION_SCOPE_P (decl)
5275 && TREE_STATIC (decl)
5276 && !DECL_ARTIFICIAL (decl))
5277 push_local_name (decl);
5278 /* Convert the initializer to the type of DECL, if we have not
5279 already initialized DECL. */
5280 if (!DECL_INITIALIZED_P (decl)
5281 /* If !DECL_EXTERNAL then DECL is being defined. In the
5282 case of a static data member initialized inside the
5283 class-specifier, there can be an initializer even if DECL
5284 is *not* defined. */
5285 && (!DECL_EXTERNAL (decl) || init))
5289 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5290 if (init_const_expr_p)
5292 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5293 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5294 TREE_CONSTANT (decl) = 1;
5297 init = check_initializer (decl, init, flags, &cleanup);
5298 /* Thread-local storage cannot be dynamically initialized. */
5299 if (DECL_THREAD_LOCAL_P (decl) && init)
5301 error ("%qD is thread-local and so cannot be dynamically "
5302 "initialized", decl);
5306 /* Check that the initializer for a static data member was a
5307 constant. Although we check in the parser that the
5308 initializer is an integral constant expression, we do not
5309 simplify division-by-zero at the point at which it
5310 occurs. Therefore, in:
5312 struct S { static const int i = 7 / 0; };
5314 we issue an error at this point. It would
5315 probably be better to forbid division by zero in
5316 integral constant expressions. */
5317 if (DECL_EXTERNAL (decl) && init)
5319 error ("%qD cannot be initialized by a non-constant expression"
5320 " when being declared", decl);
5321 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5329 The memory occupied by any object of static storage
5330 duration is zero-initialized at program startup before
5331 any other initialization takes place.
5333 We cannot create an appropriate initializer until after
5334 the type of DECL is finalized. If DECL_INITIAL is set,
5335 then the DECL is statically initialized, and any
5336 necessary zero-initialization has already been performed. */
5337 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5338 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5339 /*nelts=*/NULL_TREE,
5340 /*static_storage_p=*/true);
5341 /* Remember that the initialization for this variable has
5343 DECL_INITIALIZED_P (decl) = 1;
5344 /* This declaration is the definition of this variable,
5345 unless we are initializing a static data member within
5346 the class specifier. */
5347 if (!DECL_EXTERNAL (decl))
5348 var_definition_p = true;
5350 /* If the variable has an array type, lay out the type, even if
5351 there is no initializer. It is valid to index through the
5352 array, and we must get TYPE_ALIGN set correctly on the array
5354 else if (TREE_CODE (type) == ARRAY_TYPE)
5358 /* Add this declaration to the statement-tree. This needs to happen
5359 after the call to check_initializer so that the DECL_EXPR for a
5360 reference temp is added before the DECL_EXPR for the reference itself. */
5361 if (at_function_scope_p ())
5362 add_decl_expr (decl);
5364 /* Let the middle end know about variables and functions -- but not
5365 static data members in uninstantiated class templates. */
5366 if (!saved_processing_template_decl
5367 && (TREE_CODE (decl) == VAR_DECL
5368 || TREE_CODE (decl) == FUNCTION_DECL))
5370 if (TREE_CODE (decl) == VAR_DECL)
5372 layout_var_decl (decl);
5373 maybe_commonize_var (decl);
5376 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5378 /* Check for abstractness of the type. Notice that there is no
5379 need to strip array types here since the check for those types
5380 is already done within create_array_type_for_decl. */
5381 if (TREE_CODE (type) == FUNCTION_TYPE
5382 || TREE_CODE (type) == METHOD_TYPE)
5383 abstract_virtuals_error (decl, TREE_TYPE (type));
5385 abstract_virtuals_error (decl, type);
5387 /* This needs to happen after the linkage is set. */
5388 determine_visibility (decl);
5390 if (TREE_CODE (decl) == FUNCTION_DECL
5391 || TREE_TYPE (decl) == error_mark_node)
5392 /* No initialization required. */
5394 else if (DECL_EXTERNAL (decl)
5395 && ! (DECL_LANG_SPECIFIC (decl)
5396 && DECL_NOT_REALLY_EXTERN (decl)))
5399 DECL_INITIAL (decl) = init;
5403 /* A variable definition. */
5404 if (DECL_FUNCTION_SCOPE_P (decl))
5406 /* Initialize the local variable. */
5407 if (processing_template_decl)
5408 DECL_INITIAL (decl) = init;
5409 else if (!TREE_STATIC (decl))
5410 initialize_local_var (decl, init);
5413 /* If a variable is defined, and then a subsequent
5414 definition with external linkage is encountered, we will
5415 get here twice for the same variable. We want to avoid
5416 calling expand_static_init more than once. For variables
5417 that are not static data members, we can call
5418 expand_static_init only when we actually process the
5419 initializer. It is not legal to redeclare a static data
5420 member, so this issue does not arise in that case. */
5421 if (var_definition_p && TREE_STATIC (decl))
5423 /* If a TREE_READONLY variable needs initialization
5424 at runtime, it is no longer readonly and we need to
5425 avoid MEM_READONLY_P being set on RTL created for it. */
5428 if (TREE_READONLY (decl))
5429 TREE_READONLY (decl) = 0;
5432 expand_static_init (decl, init);
5437 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5438 reference, insert it in the statement-tree now. */
5440 push_cleanup (decl, cleanup, false);
5443 processing_template_decl = saved_processing_template_decl;
5446 TREE_READONLY (decl) = 1;
5448 /* If this was marked 'used', be sure it will be output. */
5449 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5450 mark_decl_referenced (decl);
5453 /* This is here for a midend callback from c-common.c. */
5456 finish_decl (tree decl, tree init, tree asmspec_tree)
5458 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5461 /* Returns a declaration for a VAR_DECL as if:
5463 extern "C" TYPE NAME;
5465 had been seen. Used to create compiler-generated global
5469 declare_global_var (tree name, tree type)
5473 push_to_top_level ();
5474 decl = build_decl (VAR_DECL, name, type);
5475 TREE_PUBLIC (decl) = 1;
5476 DECL_EXTERNAL (decl) = 1;
5477 DECL_ARTIFICIAL (decl) = 1;
5478 /* If the user has explicitly declared this variable (perhaps
5479 because the code we are compiling is part of a low-level runtime
5480 library), then it is possible that our declaration will be merged
5481 with theirs by pushdecl. */
5482 decl = pushdecl (decl);
5483 finish_decl (decl, NULL_TREE, NULL_TREE);
5484 pop_from_top_level ();
5489 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5490 if "__cxa_atexit" is not being used) corresponding to the function
5491 to be called when the program exits. */
5494 get_atexit_fn_ptr_type (void)
5499 if (!atexit_fn_ptr_type_node)
5501 if (flag_use_cxa_atexit
5502 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5503 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5504 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5506 /* The parameter to "atexit" is "void (*)(void)". */
5507 arg_types = void_list_node;
5509 fn_type = build_function_type (void_type_node, arg_types);
5510 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5513 return atexit_fn_ptr_type_node;
5516 /* Returns a pointer to the `atexit' function. Note that if
5517 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5518 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5521 get_atexit_node (void)
5528 bool use_aeabi_atexit;
5533 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5535 /* The declaration for `__cxa_atexit' is:
5537 int __cxa_atexit (void (*)(void *), void *, void *)
5539 We build up the argument types and then then function type
5542 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5543 /* First, build the pointer-to-function type for the first
5545 fn_ptr_type = get_atexit_fn_ptr_type ();
5546 /* Then, build the rest of the argument types. */
5547 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5548 if (use_aeabi_atexit)
5550 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5551 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5555 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5556 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5558 /* And the final __cxa_atexit type. */
5559 fn_type = build_function_type (integer_type_node, arg_types);
5560 fn_ptr_type = build_pointer_type (fn_type);
5561 if (use_aeabi_atexit)
5562 name = "__aeabi_atexit";
5564 name = "__cxa_atexit";
5568 /* The declaration for `atexit' is:
5570 int atexit (void (*)());
5572 We build up the argument types and then then function type
5574 fn_ptr_type = get_atexit_fn_ptr_type ();
5575 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5576 /* Build the final atexit type. */
5577 fn_type = build_function_type (integer_type_node, arg_types);
5581 /* Now, build the function declaration. */
5582 push_lang_context (lang_name_c);
5583 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5584 mark_used (atexit_fndecl);
5585 pop_lang_context ();
5586 atexit_node = decay_conversion (atexit_fndecl);
5591 /* Returns the __dso_handle VAR_DECL. */
5594 get_dso_handle_node (void)
5596 if (dso_handle_node)
5597 return dso_handle_node;
5599 /* Declare the variable. */
5600 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5603 return dso_handle_node;
5606 /* Begin a new function with internal linkage whose job will be simply
5607 to destroy some particular variable. */
5609 static GTY(()) int start_cleanup_cnt;
5612 start_cleanup_fn (void)
5617 bool use_cxa_atexit = flag_use_cxa_atexit
5618 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5620 push_to_top_level ();
5622 /* No need to mangle this. */
5623 push_lang_context (lang_name_c);
5625 /* Build the name of the function. */
5626 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5627 /* Build the function declaration. */
5628 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5629 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5630 /* It's a function with internal linkage, generated by the
5632 TREE_PUBLIC (fndecl) = 0;
5633 DECL_ARTIFICIAL (fndecl) = 1;
5634 /* Make the function `inline' so that it is only emitted if it is
5635 actually needed. It is unlikely that it will be inlined, since
5636 it is only called via a function pointer, but we avoid unnecessary
5637 emissions this way. */
5638 DECL_INLINE (fndecl) = 1;
5639 DECL_DECLARED_INLINE_P (fndecl) = 1;
5640 DECL_INTERFACE_KNOWN (fndecl) = 1;
5641 /* Build the parameter. */
5646 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5647 DECL_CONTEXT (parmdecl) = fndecl;
5648 TREE_USED (parmdecl) = 1;
5649 DECL_ARGUMENTS (fndecl) = parmdecl;
5653 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5655 pop_lang_context ();
5657 return current_function_decl;
5660 /* Finish the cleanup function begun by start_cleanup_fn. */
5663 end_cleanup_fn (void)
5665 expand_or_defer_fn (finish_function (0));
5667 pop_from_top_level ();
5670 /* Generate code to handle the destruction of DECL, an object with
5671 static storage duration. */
5674 register_dtor_fn (tree decl)
5683 type = TREE_TYPE (decl);
5684 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5685 return void_zero_node;
5687 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5688 a class object, we can just pass the destructor to
5689 "__cxa_atexit"; we don't have to build a temporary function to do
5691 use_dtor = (flag_use_cxa_atexit
5692 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5693 && CLASS_TYPE_P (type));
5698 /* Find the destructor. */
5699 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5700 gcc_assert (idx >= 0);
5701 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5702 /* Make sure it is accessible. */
5703 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5707 /* Call build_cleanup before we enter the anonymous function so
5708 that any access checks will be done relative to the current
5709 scope, rather than the scope of the anonymous function. */
5710 build_cleanup (decl);
5712 /* Now start the function. */
5713 cleanup = start_cleanup_fn ();
5715 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5716 to the original function, rather than the anonymous one. That
5717 will make the back end think that nested functions are in use,
5718 which causes confusion. */
5719 push_deferring_access_checks (dk_no_check);
5720 fcall = build_cleanup (decl);
5721 pop_deferring_access_checks ();
5723 /* Create the body of the anonymous function. */
5724 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5725 finish_expr_stmt (fcall);
5726 finish_compound_stmt (compound_stmt);
5730 /* Call atexit with the cleanup function. */
5731 mark_used (cleanup);
5732 cleanup = build_address (cleanup);
5733 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5739 /* We must convert CLEANUP to the type that "__cxa_atexit"
5741 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5742 /* "__cxa_atexit" will pass the address of DECL to the
5743 cleanup function. */
5745 addr = build_address (decl);
5746 /* The declared type of the parameter to "__cxa_atexit" is
5747 "void *". For plain "T*", we could just let the
5748 machinery in build_function_call convert it -- but if the
5749 type is "cv-qualified T *", then we need to convert it
5750 before passing it in, to avoid spurious errors. */
5751 addr = build_nop (ptr_type_node, addr);
5754 /* Since the cleanup functions we build ignore the address
5755 they're given, there's no reason to pass the actual address
5756 in, and, in general, it's cheaper to pass NULL than any
5758 addr = null_pointer_node;
5759 args = tree_cons (NULL_TREE,
5760 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5762 if (targetm.cxx.use_aeabi_atexit ())
5764 args = tree_cons (NULL_TREE, cleanup, args);
5765 args = tree_cons (NULL_TREE, addr, args);
5769 args = tree_cons (NULL_TREE, addr, args);
5770 args = tree_cons (NULL_TREE, cleanup, args);
5774 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5775 return build_function_call (get_atexit_node (), args);
5778 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5779 is its initializer. Generate code to handle the construction
5780 and destruction of DECL. */
5783 expand_static_init (tree decl, tree init)
5785 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5786 gcc_assert (TREE_STATIC (decl));
5788 /* Some variables require no initialization. */
5790 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5791 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5794 if (DECL_FUNCTION_SCOPE_P (decl))
5796 /* Emit code to perform this initialization but once. */
5797 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5798 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5799 tree guard, guard_addr;
5800 tree acquire_fn, release_fn, abort_fn;
5803 /* Emit code to perform this initialization but once. This code
5806 static <type> guard;
5807 if (!guard.first_byte) {
5808 if (__cxa_guard_acquire (&guard)) {
5811 // Do initialization.
5812 flag = true; __cxa_guard_release (&guard);
5813 // Register variable for destruction at end of program.
5815 if (!flag) __cxa_guard_abort (&guard);
5819 Note that the `flag' variable is only set to 1 *after* the
5820 initialization is complete. This ensures that an exception,
5821 thrown during the construction, will cause the variable to
5822 reinitialized when we pass through this code again, as per:
5826 If the initialization exits by throwing an exception, the
5827 initialization is not complete, so it will be tried again
5828 the next time control enters the declaration.
5830 This process should be thread-safe, too; multiple threads
5831 should not be able to initialize the variable more than
5834 /* Create the guard variable. */
5835 guard = get_guard (decl);
5837 /* This optimization isn't safe on targets with relaxed memory
5838 consistency. On such targets we force synchronization in
5839 __cxa_guard_acquire. */
5840 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5842 /* Begin the conditional initialization. */
5843 if_stmt = begin_if_stmt ();
5844 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5845 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5848 if (flag_threadsafe_statics)
5850 guard_addr = build_address (guard);
5852 acquire_fn = get_identifier ("__cxa_guard_acquire");
5853 release_fn = get_identifier ("__cxa_guard_release");
5854 abort_fn = get_identifier ("__cxa_guard_abort");
5855 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5857 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5859 tree vfntype = build_function_type (void_type_node, argtypes);
5860 acquire_fn = push_library_fn
5861 (acquire_fn, build_function_type (integer_type_node, argtypes));
5862 release_fn = push_library_fn (release_fn, vfntype);
5863 abort_fn = push_library_fn (abort_fn, vfntype);
5867 release_fn = identifier_global_value (release_fn);
5868 abort_fn = identifier_global_value (abort_fn);
5871 inner_if_stmt = begin_if_stmt ();
5872 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
5875 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5876 begin = get_target_expr (boolean_false_node);
5877 flag = TARGET_EXPR_SLOT (begin);
5879 TARGET_EXPR_CLEANUP (begin)
5880 = build3 (COND_EXPR, void_type_node, flag,
5882 build_call_n (abort_fn, 1, guard_addr));
5883 CLEANUP_EH_ONLY (begin) = 1;
5885 /* Do the initialization itself. */
5886 init = add_stmt_to_compound (begin, init);
5887 init = add_stmt_to_compound
5888 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5889 init = add_stmt_to_compound
5890 (init, build_call_n (release_fn, 1, guard_addr));
5893 init = add_stmt_to_compound (init, set_guard (guard));
5895 /* Use atexit to register a function for destroying this static
5897 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5899 finish_expr_stmt (init);
5901 if (flag_threadsafe_statics)
5903 finish_compound_stmt (inner_then_clause);
5904 finish_then_clause (inner_if_stmt);
5905 finish_if_stmt (inner_if_stmt);
5908 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5910 finish_compound_stmt (then_clause);
5911 finish_then_clause (if_stmt);
5912 finish_if_stmt (if_stmt);
5916 static_aggregates = tree_cons (init, decl, static_aggregates);
5920 /* Make TYPE a complete type based on INITIAL_VALUE.
5921 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5922 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5923 3 if the initializer list is empty (in pedantic mode). */
5926 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5929 tree type, elt_type;
5933 /* An array of character type can be initialized from a
5934 brace-enclosed string constant.
5936 FIXME: this code is duplicated from reshape_init. Probably
5937 we should just call reshape_init here? */
5938 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5939 && TREE_CODE (initial_value) == CONSTRUCTOR
5940 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5942 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5943 tree value = VEC_index (constructor_elt, v, 0)->value;
5945 if (TREE_CODE (value) == STRING_CST
5946 && VEC_length (constructor_elt, v) == 1)
5947 initial_value = value;
5951 failure = complete_array_type (ptype, initial_value, do_default);
5953 /* We can create the array before the element type is complete, which
5954 means that we didn't have these two bits set in the original type
5955 either. In completing the type, we are expected to propagate these
5956 bits. See also complete_type which does the same thing for arrays
5959 if (TYPE_DOMAIN (type))
5961 elt_type = TREE_TYPE (type);
5962 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5963 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5964 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5970 /* Return zero if something is declared to be a member of type
5971 CTYPE when in the context of CUR_TYPE. STRING is the error
5972 message to print in that case. Otherwise, quietly return 1. */
5975 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5977 if (ctype && ctype != cur_type)
5979 if (flags == DTOR_FLAG)
5980 error ("destructor for alien class %qT cannot be a member", ctype);
5982 error ("constructor for alien class %qT cannot be a member", ctype);
5988 /* Subroutine of `grokdeclarator'. */
5990 /* Generate errors possibly applicable for a given set of specifiers.
5991 This is for ARM $7.1.2. */
5994 bad_specifiers (tree object,
6003 error ("%qD declared as a %<virtual%> %s", object, type);
6005 error ("%qD declared as an %<inline%> %s", object, type);
6007 error ("%<const%> and %<volatile%> function specifiers on "
6008 "%qD invalid in %s declaration",
6011 error ("%q+D declared as a friend", object);
6013 && (TREE_CODE (object) == TYPE_DECL
6014 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6015 && !TYPE_REFFN_P (TREE_TYPE (object))
6016 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6017 error ("%q+D declared with an exception specification", object);
6020 /* DECL is a member function or static data member and is presently
6021 being defined. Check that the definition is taking place in a
6025 check_class_member_definition_namespace (tree decl)
6027 /* These checks only apply to member functions and static data
6029 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6030 || TREE_CODE (decl) == VAR_DECL);
6031 /* We check for problems with specializations in pt.c in
6032 check_specialization_namespace, where we can issue better
6034 if (processing_specialization)
6036 /* There are no restrictions on the placement of
6037 explicit instantiations. */
6038 if (processing_explicit_instantiation)
6042 A member function definition that appears outside of the
6043 class definition shall appear in a namespace scope enclosing
6044 the class definition.
6048 The definition for a static data member shall appear in a
6049 namespace scope enclosing the member's class definition. */
6050 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6051 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6052 decl, DECL_CONTEXT (decl));
6055 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6056 METHOD_TYPE for a non-static member function; QUALS are the
6057 cv-qualifiers that apply to the function. */
6060 build_this_parm (tree type, cp_cv_quals quals)
6065 cp_cv_quals this_quals;
6067 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6068 /* The `this' parameter is implicitly `const'; it cannot be
6070 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6071 qual_type = cp_build_qualified_type (this_type, this_quals);
6072 parm = build_artificial_parm (this_identifier, qual_type);
6073 cp_apply_type_quals_to_decl (this_quals, parm);
6077 /* CTYPE is class type, or null if non-class.
6078 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6080 DECLARATOR is the function's name.
6081 PARMS is a chain of PARM_DECLs for the function.
6082 VIRTUALP is truthvalue of whether the function is virtual or not.
6083 FLAGS are to be passed through to `grokclassfn'.
6084 QUALS are qualifiers indicating whether the function is `const'
6086 RAISES is a list of exceptions that this function can raise.
6087 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6088 not look, and -1 if we should not call `grokclassfn' at all.
6090 SFK is the kind of special function (if any) for the new function.
6092 Returns `NULL_TREE' if something goes wrong, after issuing
6093 applicable error messages. */
6096 grokfndecl (tree ctype,
6100 tree orig_declarator,
6102 enum overload_flags flags,
6109 special_function_kind sfk,
6116 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6120 type = build_exception_variant (type, raises);
6122 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6123 if (TREE_CODE (type) == METHOD_TYPE)
6126 parm = build_this_parm (type, quals);
6127 TREE_CHAIN (parm) = parms;
6130 DECL_ARGUMENTS (decl) = parms;
6131 /* Propagate volatile out from type to decl. */
6132 if (TYPE_VOLATILE (type))
6133 TREE_THIS_VOLATILE (decl) = 1;
6135 /* Setup decl according to sfk. */
6138 case sfk_constructor:
6139 case sfk_copy_constructor:
6140 DECL_CONSTRUCTOR_P (decl) = 1;
6142 case sfk_destructor:
6143 DECL_DESTRUCTOR_P (decl) = 1;
6150 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6154 ("defining explicit specialization %qD in friend declaration",
6158 tree fns = TREE_OPERAND (orig_declarator, 0);
6159 tree args = TREE_OPERAND (orig_declarator, 1);
6161 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6163 /* Something like `template <class T> friend void f<T>()'. */
6164 error ("invalid use of template-id %qD in declaration "
6165 "of primary template",
6171 /* A friend declaration of the form friend void f<>(). Record
6172 the information in the TEMPLATE_ID_EXPR. */
6173 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6175 if (TREE_CODE (fns) == COMPONENT_REF)
6177 /* Due to bison parser ickiness, we will have already looked
6178 up an operator_name or PFUNCNAME within the current class
6179 (see template_id in parse.y). If the current class contains
6180 such a name, we'll get a COMPONENT_REF here. Undo that. */
6182 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6183 == current_class_type);
6184 fns = TREE_OPERAND (fns, 1);
6186 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6187 || TREE_CODE (fns) == OVERLOAD);
6188 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6190 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6191 if (TREE_PURPOSE (t)
6192 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6194 error ("default arguments are not allowed in declaration "
6195 "of friend template specialization %qD",
6202 error ("%<inline%> is not allowed in declaration of friend "
6203 "template specialization %qD",
6210 /* If this decl has namespace scope, set that up. */
6212 set_decl_namespace (decl, in_namespace, friendp);
6214 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6216 /* `main' and builtins have implicit 'C' linkage. */
6217 if ((MAIN_NAME_P (declarator)
6218 || (IDENTIFIER_LENGTH (declarator) > 10
6219 && IDENTIFIER_POINTER (declarator)[0] == '_'
6220 && IDENTIFIER_POINTER (declarator)[1] == '_'
6221 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6222 && current_lang_name == lang_name_cplusplus
6223 && ctype == NULL_TREE
6224 /* NULL_TREE means global namespace. */
6225 && DECL_CONTEXT (decl) == NULL_TREE)
6226 SET_DECL_LANGUAGE (decl, lang_c);
6228 /* Should probably propagate const out from type to decl I bet (mrs). */
6231 DECL_STATIC_FUNCTION_P (decl) = 1;
6232 DECL_CONTEXT (decl) = ctype;
6237 DECL_CONTEXT (decl) = ctype;
6239 check_class_member_definition_namespace (decl);
6242 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6244 if (processing_template_decl)
6245 error ("cannot declare %<::main%> to be a template");
6247 error ("cannot declare %<::main%> to be inline");
6249 error ("cannot declare %<::main%> to be static");
6254 /* Members of anonymous types and local classes have no linkage; make
6255 them internal. If a typedef is made later, this will be changed. */
6256 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6257 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6262 /* [basic.link]: A name with no linkage (notably, the name of a class
6263 or enumeration declared in a local scope) shall not be used to
6264 declare an entity with linkage.
6266 Only check this for public decls for now. See core 319, 389. */
6267 t = no_linkage_check (TREE_TYPE (decl),
6268 /*relaxed_p=*/false);
6271 if (TYPE_ANONYMOUS_P (t))
6273 if (DECL_EXTERN_C_P (decl))
6274 /* Allow this; it's pretty common in C. */;
6277 pedwarn ("non-local function %q#D uses anonymous type",
6279 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6280 pedwarn ("%q+#D does not refer to the unqualified "
6281 "type, so it is not used for linkage",
6286 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6290 TREE_PUBLIC (decl) = publicp;
6293 DECL_INTERFACE_KNOWN (decl) = 1;
6294 DECL_NOT_REALLY_EXTERN (decl) = 1;
6297 /* If the declaration was declared inline, mark it as such. */
6299 DECL_DECLARED_INLINE_P (decl) = 1;
6300 /* We inline functions that are explicitly declared inline, or, when
6301 the user explicitly asks us to, all functions. */
6302 if (DECL_DECLARED_INLINE_P (decl)
6303 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6304 DECL_INLINE (decl) = 1;
6306 DECL_EXTERNAL (decl) = 1;
6307 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6310 ? G_("static member function %qD cannot have cv-qualifier")
6311 : G_("non-member function %qD cannot have cv-qualifier"),
6313 quals = TYPE_UNQUALIFIED;
6316 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6317 && !grok_op_properties (decl, /*complain=*/true))
6320 if (ctype && decl_function_context (decl))
6321 DECL_NO_STATIC_CHAIN (decl) = 1;
6324 /* Make the init_value nonzero so pushdecl knows this is not
6325 tentative. error_mark_node is replaced later with the BLOCK. */
6326 DECL_INITIAL (decl) = error_mark_node;
6328 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6329 TREE_NOTHROW (decl) = 1;
6331 /* Caller will do the rest of this. */
6335 if (ctype != NULL_TREE)
6336 grokclassfn (ctype, decl, flags);
6338 decl = check_explicit_specialization (orig_declarator, decl,
6341 4 * (friendp != 0));
6342 if (decl == error_mark_node)
6347 cplus_decl_attributes (&decl, *attrlist, 0);
6348 *attrlist = NULL_TREE;
6351 /* Check main's type after attributes have been applied. */
6352 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6354 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6357 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6359 error ("%<::main%> must return %<int%>");
6360 newtype = build_function_type (integer_type_node, oldtypeargs);
6361 TREE_TYPE (decl) = newtype;
6363 check_main_parameter_types (decl);
6366 if (ctype != NULL_TREE
6367 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6372 old_decl = check_classfn (ctype, decl,
6373 (processing_template_decl
6374 > template_class_depth (ctype))
6375 ? current_template_parms
6382 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6383 /* Because grokfndecl is always supposed to return a
6384 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6385 here. We depend on our callers to figure out that its
6386 really a template that's being returned. */
6387 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6389 if (DECL_STATIC_FUNCTION_P (old_decl)
6390 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6391 /* Remove the `this' parm added by grokclassfn.
6392 XXX Isn't this done in start_function, too? */
6393 revert_static_member_fn (decl);
6394 if (DECL_ARTIFICIAL (old_decl))
6395 error ("definition of implicitly-declared %qD", old_decl);
6397 /* Since we've smashed OLD_DECL to its
6398 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6399 if (TREE_CODE (decl) == TEMPLATE_DECL)
6400 decl = DECL_TEMPLATE_RESULT (decl);
6402 /* Attempt to merge the declarations. This can fail, in
6403 the case of some invalid specialization declarations. */
6404 pushed_scope = push_scope (ctype);
6405 ok = duplicate_decls (decl, old_decl, friendp);
6407 pop_scope (pushed_scope);
6410 error ("no %q#D member function declared in class %qT",
6418 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6421 if (ctype == NULL_TREE || check)
6425 DECL_VIRTUAL_P (decl) = 1;
6430 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6431 the linkage that DECL will receive in the object file. */
6434 set_linkage_for_static_data_member (tree decl)
6436 /* A static data member always has static storage duration and
6437 external linkage. Note that static data members are forbidden in
6438 local classes -- the only situation in which a class has
6439 non-external linkage. */
6440 TREE_PUBLIC (decl) = 1;
6441 TREE_STATIC (decl) = 1;
6442 /* For non-template classes, static data members are always put
6443 out in exactly those files where they are defined, just as
6444 with ordinary namespace-scope variables. */
6445 if (!processing_template_decl)
6446 DECL_INTERFACE_KNOWN (decl) = 1;
6449 /* Create a VAR_DECL named NAME with the indicated TYPE.
6451 If SCOPE is non-NULL, it is the class type or namespace containing
6452 the variable. If SCOPE is NULL, the variable should is created in
6453 the innermost enclosings scope. */
6456 grokvardecl (tree type,
6458 const cp_decl_specifier_seq *declspecs,
6464 tree explicit_scope;
6466 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6468 /* Compute the scope in which to place the variable, but remember
6469 whether or not that scope was explicitly specified by the user. */
6470 explicit_scope = scope;
6473 /* An explicit "extern" specifier indicates a namespace-scope
6475 if (declspecs->storage_class == sc_extern)
6476 scope = current_namespace;
6477 else if (!at_function_scope_p ())
6478 scope = current_scope ();
6482 && (/* If the variable is a namespace-scope variable declared in a
6483 template, we need DECL_LANG_SPECIFIC. */
6484 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6485 /* Similarly for namespace-scope variables with language linkage
6487 || (TREE_CODE (scope) == NAMESPACE_DECL
6488 && current_lang_name != lang_name_cplusplus)
6489 /* Similarly for static data members. */
6491 decl = build_lang_decl (VAR_DECL, name, type);
6493 decl = build_decl (VAR_DECL, name, type);
6495 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6496 set_decl_namespace (decl, explicit_scope, 0);
6498 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6500 if (declspecs->storage_class == sc_extern)
6502 DECL_THIS_EXTERN (decl) = 1;
6503 DECL_EXTERNAL (decl) = !initialized;
6506 if (DECL_CLASS_SCOPE_P (decl))
6508 set_linkage_for_static_data_member (decl);
6509 /* This function is only called with out-of-class definitions. */
6510 DECL_EXTERNAL (decl) = 0;
6511 check_class_member_definition_namespace (decl);
6513 /* At top level, either `static' or no s.c. makes a definition
6514 (perhaps tentative), and absence of `static' makes it public. */
6515 else if (toplevel_bindings_p ())
6517 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6518 && (DECL_THIS_EXTERN (decl) || ! constp));
6519 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6521 /* Not at top level, only `static' makes a static definition. */
6524 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6525 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6528 if (declspecs->specs[(int)ds_thread])
6529 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6531 if (TREE_PUBLIC (decl))
6533 /* [basic.link]: A name with no linkage (notably, the name of a class
6534 or enumeration declared in a local scope) shall not be used to
6535 declare an entity with linkage.
6537 Only check this for public decls for now. */
6538 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6541 if (TYPE_ANONYMOUS_P (t))
6543 if (DECL_EXTERN_C_P (decl))
6544 /* Allow this; it's pretty common in C. */
6548 /* DRs 132, 319 and 389 seem to indicate types with
6549 no linkage can only be used to declare extern "C"
6550 entities. Since it's not always an error in the
6551 ISO C++ 90 Standard, we only issue a warning. */
6552 warning (0, "non-local variable %q#D uses anonymous type",
6554 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6555 warning (0, "%q+#D does not refer to the unqualified "
6556 "type, so it is not used for linkage",
6561 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6565 DECL_INTERFACE_KNOWN (decl) = 1;
6570 /* Create and return a canonical pointer to member function type, for
6571 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6574 build_ptrmemfunc_type (tree type)
6578 tree unqualified_variant = NULL_TREE;
6580 if (type == error_mark_node)
6583 /* If a canonical type already exists for this type, use it. We use
6584 this method instead of type_hash_canon, because it only does a
6585 simple equality check on the list of field members. */
6587 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6590 /* Make sure that we always have the unqualified pointer-to-member
6592 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6594 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6596 t = make_aggr_type (RECORD_TYPE);
6597 xref_basetypes (t, NULL_TREE);
6599 /* Let the front end know this is a pointer to member function... */
6600 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6601 /* ... and not really an aggregate. */
6602 SET_IS_AGGR_TYPE (t, 0);
6604 field = build_decl (FIELD_DECL, pfn_identifier, type);
6607 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6608 TREE_CHAIN (field) = fields;
6611 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6613 /* Zap out the name so that the back end will give us the debugging
6614 information for this anonymous RECORD_TYPE. */
6615 TYPE_NAME (t) = NULL_TREE;
6617 /* If this is not the unqualified form of this pointer-to-member
6618 type, set the TYPE_MAIN_VARIANT for this type to be the
6619 unqualified type. Since they are actually RECORD_TYPEs that are
6620 not variants of each other, we must do this manually. */
6621 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6623 t = build_qualified_type (t, cp_type_quals (type));
6624 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6625 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6626 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6629 /* Cache this pointer-to-member type so that we can find it again
6631 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6633 /* Managing canonical types for the RECORD_TYPE behind a
6634 pointer-to-member function is a nightmare, so use structural
6635 equality for now. */
6636 SET_TYPE_STRUCTURAL_EQUALITY (t);
6641 /* Create and return a pointer to data member type. */
6644 build_ptrmem_type (tree class_type, tree member_type)
6646 if (TREE_CODE (member_type) == METHOD_TYPE)
6650 arg_types = TYPE_ARG_TYPES (member_type);
6651 class_type = (cp_build_qualified_type
6653 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6655 = build_method_type_directly (class_type,
6656 TREE_TYPE (member_type),
6657 TREE_CHAIN (arg_types));
6658 return build_ptrmemfunc_type (build_pointer_type (member_type));
6662 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6663 return build_offset_type (class_type, member_type);
6667 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6668 Check to see that the definition is valid. Issue appropriate error
6669 messages. Return 1 if the definition is particularly bad, or 0
6673 check_static_variable_definition (tree decl, tree type)
6675 /* Motion 10 at San Diego: If a static const integral data member is
6676 initialized with an integral constant expression, the initializer
6677 may appear either in the declaration (within the class), or in
6678 the definition, but not both. If it appears in the class, the
6679 member is a member constant. The file-scope definition is always
6681 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6683 error ("invalid in-class initialization of static data member "
6684 "of non-integral type %qT",
6686 /* If we just return the declaration, crashes will sometimes
6687 occur. We therefore return void_type_node, as if this were a
6688 friend declaration, to cause callers to completely ignore
6689 this declaration. */
6692 else if (!CP_TYPE_CONST_P (type))
6693 error ("ISO C++ forbids in-class initialization of non-const "
6694 "static member %qD",
6696 else if (pedantic && !INTEGRAL_TYPE_P (type))
6697 pedwarn ("ISO C++ forbids initialization of member constant "
6698 "%qD of non-integral type %qT", decl, type);
6703 /* Given the SIZE (i.e., number of elements) in an array, compute an
6704 appropriate index type for the array. If non-NULL, NAME is the
6705 name of the thing being declared. */
6708 compute_array_index_type (tree name, tree size)
6712 tree abi_1_itype = NULL_TREE;
6714 if (error_operand_p (size))
6715 return error_mark_node;
6717 type = TREE_TYPE (size);
6718 /* The array bound must be an integer type. */
6719 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6722 error ("size of array %qD has non-integral type %qT", name, type);
6724 error ("size of array has non-integral type %qT", type);
6725 size = integer_one_node;
6726 type = TREE_TYPE (size);
6729 if (value_dependent_expression_p (size))
6731 /* We cannot do any checking for a value-dependent SIZE. Just
6732 build the index type and mark that it requires structural
6734 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6735 size, integer_one_node));
6736 SET_TYPE_STRUCTURAL_EQUALITY (itype);
6740 if (!abi_version_at_least (2) && processing_template_decl)
6741 /* For abi-1, we handled all instances in templates the same way,
6742 even when they were non-dependent. This effects the manglings
6743 produced. So, we do the normal checking for non-dependent
6744 sizes, but at the end we'll return the same type that abi-1
6745 would have, but with TYPE_CANONICAL set to the "right"
6746 value that the current ABI would provide. */
6747 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6748 size, integer_one_node));
6750 /* The size might be the result of a cast. */
6751 STRIP_TYPE_NOPS (size);
6753 /* It might be a const variable or enumeration constant. */
6754 size = integral_constant_value (size);
6756 /* Normally, the array-bound will be a constant. */
6757 if (TREE_CODE (size) == INTEGER_CST)
6759 /* Check to see if the array bound overflowed. Make that an
6760 error, no matter how generous we're being. */
6761 int old_flag_pedantic_errors = flag_pedantic_errors;
6762 int old_pedantic = pedantic;
6763 pedantic = flag_pedantic_errors = 1;
6764 constant_expression_warning (size);
6765 pedantic = old_pedantic;
6766 flag_pedantic_errors = old_flag_pedantic_errors;
6768 /* An array must have a positive number of elements. */
6769 if (INT_CST_LT (size, integer_zero_node))
6772 error ("size of array %qD is negative", name);
6774 error ("size of array is negative");
6775 size = integer_one_node;
6777 /* As an extension we allow zero-sized arrays. We always allow
6778 them in system headers because glibc uses them. */
6779 else if (integer_zerop (size) && pedantic && !in_system_header)
6782 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6784 pedwarn ("ISO C++ forbids zero-size array");
6787 else if (TREE_CONSTANT (size))
6789 /* `(int) &fn' is not a valid array bound. */
6791 error ("size of array %qD is not an integral constant-expression",
6794 error ("size of array is not an integral constant-expression");
6795 size = integer_one_node;
6797 else if (pedantic && warn_vla != 0)
6800 pedwarn ("ISO C++ forbids variable length array %qD", name);
6802 pedwarn ("ISO C++ forbids variable length array");
6804 else if (warn_vla > 0)
6808 "variable length array %qD is used", name);
6811 "variable length array is used");
6814 if (processing_template_decl && !TREE_CONSTANT (size))
6815 /* A variable sized array. */
6816 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6819 HOST_WIDE_INT saved_processing_template_decl;
6821 /* Compute the index of the largest element in the array. It is
6822 one less than the number of elements in the array. We save
6823 and restore PROCESSING_TEMPLATE_DECL so that computations in
6824 cp_build_binary_op will be appropriately folded. */
6825 saved_processing_template_decl = processing_template_decl;
6826 processing_template_decl = 0;
6827 itype = cp_build_binary_op (MINUS_EXPR,
6828 cp_convert (ssizetype, size),
6829 cp_convert (ssizetype, integer_one_node));
6830 itype = fold (itype);
6831 processing_template_decl = saved_processing_template_decl;
6833 if (!TREE_CONSTANT (itype))
6834 /* A variable sized array. */
6835 itype = variable_size (itype);
6836 /* Make sure that there was no overflow when creating to a signed
6837 index type. (For example, on a 32-bit machine, an array with
6838 size 2^32 - 1 is too big.) */
6839 else if (TREE_CODE (itype) == INTEGER_CST
6840 && TREE_OVERFLOW (itype))
6842 error ("overflow in array dimension");
6843 TREE_OVERFLOW (itype) = 0;
6847 /* Create and return the appropriate index type. */
6850 tree t = build_index_type (itype);
6851 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
6855 return build_index_type (itype);
6858 /* Returns the scope (if any) in which the entity declared by
6859 DECLARATOR will be located. If the entity was declared with an
6860 unqualified name, NULL_TREE is returned. */
6863 get_scope_of_declarator (const cp_declarator *declarator)
6865 while (declarator && declarator->kind != cdk_id)
6866 declarator = declarator->declarator;
6868 /* If the declarator-id is a SCOPE_REF, the scope in which the
6869 declaration occurs is the first operand. */
6871 && declarator->u.id.qualifying_scope)
6872 return declarator->u.id.qualifying_scope;
6874 /* Otherwise, the declarator is not a qualified name; the entity will
6875 be declared in the current scope. */
6879 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6880 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6884 create_array_type_for_decl (tree name, tree type, tree size)
6886 tree itype = NULL_TREE;
6887 const char* error_msg;
6889 /* If things have already gone awry, bail now. */
6890 if (type == error_mark_node || size == error_mark_node)
6891 return error_mark_node;
6893 /* Assume that everything will go OK. */
6896 /* There are some types which cannot be array elements. */
6897 switch (TREE_CODE (type))
6900 error_msg = "array of void";
6904 error_msg = "array of functions";
6907 case REFERENCE_TYPE:
6908 error_msg = "array of references";
6912 error_msg = "array of function members";
6919 /* If something went wrong, issue an error-message and return. */
6923 error ("declaration of %qD as %s", name, error_msg);
6925 error ("creating %s", error_msg);
6927 return error_mark_node;
6932 The constant expressions that specify the bounds of the arrays
6933 can be omitted only for the first member of the sequence. */
6934 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6937 error ("declaration of %qD as multidimensional array must "
6938 "have bounds for all dimensions except the first",
6941 error ("multidimensional array must have bounds for all "
6942 "dimensions except the first");
6944 return error_mark_node;
6947 /* Figure out the index type for the array. */
6949 itype = compute_array_index_type (name, size);
6952 T is called the array element type; this type shall not be [...] an
6953 abstract class type. */
6954 abstract_virtuals_error (name, type);
6956 return build_cplus_array_type (type, itype);
6959 /* Check that it's OK to declare a function with the indicated TYPE.
6960 SFK indicates the kind of special function (if any) that this
6961 function is. OPTYPE is the type given in a conversion operator
6962 declaration, or the class type for a constructor/destructor.
6963 Returns the actual return type of the function; that
6964 may be different than TYPE if an error occurs, or for certain
6965 special functions. */
6968 check_special_function_return_type (special_function_kind sfk,
6974 case sfk_constructor:
6976 error ("return type specification for constructor invalid");
6978 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6979 type = build_pointer_type (optype);
6981 type = void_type_node;
6984 case sfk_destructor:
6986 error ("return type specification for destructor invalid");
6987 /* We can't use the proper return type here because we run into
6988 problems with ambiguous bases and covariant returns.
6989 Java classes are left unchanged because (void *) isn't a valid
6990 Java type, and we don't want to change the Java ABI. */
6991 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6992 type = build_pointer_type (void_type_node);
6994 type = void_type_node;
6997 case sfk_conversion:
6998 if (type && !same_type_p (type, optype))
6999 error ("operator %qT declared to return %qT", optype, type);
7001 pedwarn ("return type specified for %<operator %T%>", optype);
7012 /* A variable or data member (whose unqualified name is IDENTIFIER)
7013 has been declared with the indicated TYPE. If the TYPE is not
7014 acceptable, issue an error message and return a type to use for
7015 error-recovery purposes. */
7018 check_var_type (tree identifier, tree type)
7020 if (VOID_TYPE_P (type))
7023 error ("unnamed variable or field declared void");
7024 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7026 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7027 error ("variable or field %qE declared void", identifier);
7030 error ("variable or field declared void");
7031 type = error_mark_node;
7037 /* Given declspecs and a declarator (abstract or otherwise), determine
7038 the name and type of the object declared and construct a DECL node
7041 DECLSPECS points to the representation of declaration-specifier
7042 sequence that precedes declarator.
7044 DECL_CONTEXT says which syntactic context this declaration is in:
7045 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7046 FUNCDEF for a function definition. Like NORMAL but a few different
7047 error messages in each case. Return value may be zero meaning
7048 this definition is too screwy to try to parse.
7049 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7050 handle member functions (which have FIELD context).
7051 Return value may be zero meaning this definition is too screwy to
7053 PARM for a parameter declaration (either within a function prototype
7054 or before a function body). Make a PARM_DECL, or return void_type_node.
7055 CATCHPARM for a parameter declaration before a catch clause.
7056 TYPENAME if for a typename (in a cast or sizeof).
7057 Don't make a DECL node; just return the ..._TYPE node.
7058 FIELD for a struct or union field; make a FIELD_DECL.
7059 BITFIELD for a field with specified width.
7060 INITIALIZED is 1 if the decl has an initializer.
7062 ATTRLIST is a pointer to the list of attributes, which may be NULL
7063 if there are none; *ATTRLIST may be modified if attributes from inside
7064 the declarator should be applied to the declaration.
7066 When this function is called, scoping variables (such as
7067 CURRENT_CLASS_TYPE) should reflect the scope in which the
7068 declaration occurs, not the scope in which the new declaration will
7069 be placed. For example, on:
7073 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7076 Returns a DECL (if a declarator is present), a TYPE (if there is no
7077 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7081 grokdeclarator (const cp_declarator *declarator,
7082 const cp_decl_specifier_seq *declspecs,
7083 enum decl_context decl_context,
7087 tree type = NULL_TREE;
7089 int virtualp, explicitp, friendp, inlinep, staticp;
7090 int explicit_int = 0;
7091 int explicit_char = 0;
7092 int defaulted_int = 0;
7093 tree dependent_name = NULL_TREE;
7095 tree typedef_decl = NULL_TREE;
7096 const char *name = NULL;
7097 tree typedef_type = NULL_TREE;
7098 /* True if this declarator is a function definition. */
7099 bool funcdef_flag = false;
7100 cp_declarator_kind innermost_code = cdk_error;
7103 /* See the code below that used this. */
7104 tree decl_attr = NULL_TREE;
7107 /* Keep track of what sort of function is being processed
7108 so that we can warn about default return values, or explicit
7109 return values which do not match prescribed defaults. */
7110 special_function_kind sfk = sfk_none;
7112 tree dname = NULL_TREE;
7113 tree ctor_return_type = NULL_TREE;
7114 enum overload_flags flags = NO_SPECIAL;
7115 /* cv-qualifiers that apply to the declarator, for a declaration of
7116 a member function. */
7117 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7118 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7120 tree raises = NULL_TREE;
7121 int template_count = 0;
7122 tree returned_attrs = NULL_TREE;
7123 tree parms = NULL_TREE;
7124 const cp_declarator *id_declarator;
7125 /* The unqualified name of the declarator; either an
7126 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7127 tree unqualified_id;
7128 /* The class type, if any, in which this entity is located,
7129 or NULL_TREE if none. Note that this value may be different from
7130 the current class type; for example if an attempt is made to declare
7131 "A::f" inside "B", this value will be "A". */
7132 tree ctype = current_class_type;
7133 /* The NAMESPACE_DECL for the namespace in which this entity is
7134 located. If an unqualified name is used to declare the entity,
7135 this value will be NULL_TREE, even if the entity is located at
7137 tree in_namespace = NULL_TREE;
7138 cp_storage_class storage_class;
7139 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7140 bool type_was_error_mark_node = false;
7141 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7142 bool set_no_warning = false;
7144 signed_p = declspecs->specs[(int)ds_signed];
7145 unsigned_p = declspecs->specs[(int)ds_unsigned];
7146 short_p = declspecs->specs[(int)ds_short];
7147 long_p = declspecs->specs[(int)ds_long];
7148 longlong = declspecs->specs[(int)ds_long] >= 2;
7149 thread_p = declspecs->specs[(int)ds_thread];
7151 if (decl_context == FUNCDEF)
7152 funcdef_flag = true, decl_context = NORMAL;
7153 else if (decl_context == MEMFUNCDEF)
7154 funcdef_flag = true, decl_context = FIELD;
7155 else if (decl_context == BITFIELD)
7156 bitfield = 1, decl_context = FIELD;
7158 /* Look inside a declarator for the name being declared
7159 and get it as a string, for an error message. */
7160 for (id_declarator = declarator;
7162 id_declarator = id_declarator->declarator)
7164 if (id_declarator->kind != cdk_id)
7165 innermost_code = id_declarator->kind;
7167 switch (id_declarator->kind)
7170 if (id_declarator->declarator
7171 && id_declarator->declarator->kind == cdk_id)
7173 sfk = id_declarator->declarator->u.id.sfk;
7174 if (sfk == sfk_destructor)
7181 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7182 tree decl = id_declarator->u.id.unqualified_name;
7185 if (qualifying_scope)
7187 if (at_function_scope_p ())
7191 A declarator-id shall not be qualified except
7194 None of the cases are permitted in block
7196 if (qualifying_scope == global_namespace)
7197 error ("invalid use of qualified-name %<::%D%>",
7199 else if (TYPE_P (qualifying_scope))
7200 error ("invalid use of qualified-name %<%T::%D%>",
7201 qualifying_scope, decl);
7203 error ("invalid use of qualified-name %<%D::%D%>",
7204 qualifying_scope, decl);
7205 return error_mark_node;
7207 else if (TYPE_P (qualifying_scope))
7209 ctype = qualifying_scope;
7210 if (innermost_code != cdk_function
7211 && current_class_type
7212 && !UNIQUELY_DERIVED_FROM_P (ctype,
7213 current_class_type))
7215 error ("type %qT is not derived from type %qT",
7216 ctype, current_class_type);
7217 return error_mark_node;
7220 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7221 in_namespace = qualifying_scope;
7223 switch (TREE_CODE (decl))
7229 if (innermost_code != cdk_function)
7231 error ("declaration of %qD as non-function", decl);
7232 return error_mark_node;
7234 else if (!qualifying_scope
7235 && !(current_class_type && at_class_scope_p ()))
7237 error ("declaration of %qD as non-member", decl);
7238 return error_mark_node;
7241 type = TREE_OPERAND (decl, 0);
7242 name = IDENTIFIER_POINTER (constructor_name (type));
7247 case TEMPLATE_ID_EXPR:
7249 tree fns = TREE_OPERAND (decl, 0);
7252 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7254 gcc_assert (is_overloaded_fn (dname));
7255 dname = DECL_NAME (get_first_fn (dname));
7260 case IDENTIFIER_NODE:
7261 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7264 if (C_IS_RESERVED_WORD (dname))
7266 error ("declarator-id missing; using reserved word %qD",
7268 name = IDENTIFIER_POINTER (dname);
7270 else if (!IDENTIFIER_TYPENAME_P (dname))
7271 name = IDENTIFIER_POINTER (dname);
7274 gcc_assert (flags == NO_SPECIAL);
7275 flags = TYPENAME_FLAG;
7276 ctor_return_type = TREE_TYPE (dname);
7277 sfk = sfk_conversion;
7278 if (is_typename_at_global_scope (dname))
7279 name = IDENTIFIER_POINTER (dname);
7281 name = "<invalid operator>";
7298 return error_mark_node;
7303 if (id_declarator->kind == cdk_id)
7309 The declarator in a function-definition shall have the form
7310 D1 ( parameter-declaration-clause) ... */
7311 if (funcdef_flag && innermost_code != cdk_function)
7313 error ("function definition does not declare parameters");
7314 return error_mark_node;
7317 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7318 && innermost_code != cdk_function
7319 && ! (ctype && !declspecs->any_specifiers_p))
7321 error ("declaration of %qD as non-function", dname);
7322 return error_mark_node;
7325 /* Anything declared one level down from the top level
7326 must be one of the parameters of a function
7327 (because the body is at least two levels down). */
7329 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7330 by not allowing C++ class definitions to specify their parameters
7331 with xdecls (must be spec.d in the parmlist).
7333 Since we now wait to push a class scope until we are sure that
7334 we are in a legitimate method context, we must set oldcname
7335 explicitly (since current_class_name is not yet alive).
7337 We also want to avoid calling this a PARM if it is in a namespace. */
7339 if (decl_context == NORMAL && !toplevel_bindings_p ())
7341 struct cp_binding_level *b = current_binding_level;
7342 current_binding_level = b->level_chain;
7343 if (current_binding_level != 0 && toplevel_bindings_p ())
7344 decl_context = PARM;
7345 current_binding_level = b;
7349 name = decl_context == PARM ? "parameter" : "type name";
7351 /* If there were multiple types specified in the decl-specifier-seq,
7352 issue an error message. */
7353 if (declspecs->multiple_types_p)
7355 error ("two or more data types in declaration of %qs", name);
7356 return error_mark_node;
7359 /* Extract the basic type from the decl-specifier-seq. */
7360 type = declspecs->type;
7361 if (type == error_mark_node)
7364 type_was_error_mark_node = true;
7366 /* If the entire declaration is itself tagged as deprecated then
7367 suppress reports of deprecated items. */
7368 if (type && TREE_DEPRECATED (type)
7369 && deprecated_state != DEPRECATED_SUPPRESS)
7370 warn_deprecated_use (type);
7371 if (type && TREE_CODE (type) == TYPE_DECL)
7373 typedef_decl = type;
7374 type = TREE_TYPE (typedef_decl);
7376 /* No type at all: default to `int', and set DEFAULTED_INT
7377 because it was not a user-defined typedef. */
7378 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7380 /* These imply 'int'. */
7381 type = integer_type_node;
7385 explicit_int = declspecs->explicit_int_p;
7386 explicit_char = declspecs->explicit_char_p;
7389 /* See the code below that used this. */
7391 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7393 typedef_type = type;
7396 if (sfk != sfk_conversion)
7397 ctor_return_type = ctype;
7399 if (sfk != sfk_none)
7400 type = check_special_function_return_type (sfk, type,
7402 else if (type == NULL_TREE)
7408 /* We handle `main' specially here, because 'main () { }' is so
7409 common. With no options, it is allowed. With -Wreturn-type,
7410 it is a warning. It is only an error with -pedantic-errors. */
7411 is_main = (funcdef_flag
7412 && dname && MAIN_NAME_P (dname)
7413 && ctype == NULL_TREE
7414 && in_namespace == NULL_TREE
7415 && current_namespace == global_namespace);
7417 if (type_was_error_mark_node)
7418 /* We've already issued an error, don't complain more. */;
7419 else if (in_system_header || flag_ms_extensions)
7420 /* Allow it, sigh. */;
7421 else if (pedantic || ! is_main)
7422 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7424 warning (OPT_Wreturn_type,
7425 "ISO C++ forbids declaration of %qs with no type", name);
7427 type = integer_type_node;
7432 /* Now process the modifiers that were specified
7433 and check for invalid combinations. */
7435 /* Long double is a special combination. */
7436 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7439 type = build_qualified_type (long_double_type_node,
7440 cp_type_quals (type));
7443 /* Check all other uses of type modifiers. */
7445 if (unsigned_p || signed_p || long_p || short_p)
7449 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7450 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7451 else if (signed_p && unsigned_p)
7452 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7453 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7454 error ("%<long long%> invalid for %qs", name);
7455 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7456 error ("%<long%> invalid for %qs", name);
7457 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7458 error ("%<short%> invalid for %qs", name);
7459 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7460 error ("%<long%> or %<short%> invalid for %qs", name);
7461 else if ((long_p || short_p) && explicit_char)
7462 error ("%<long%> or %<short%> specified with char for %qs", name);
7463 else if (long_p && short_p)
7464 error ("%<long%> and %<short%> specified together for %qs", name);
7468 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7470 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7472 if (flag_pedantic_errors)
7477 /* Discard the type modifiers if they are invalid. */
7488 /* Decide whether an integer type is signed or not.
7489 Optionally treat bitfields as signed by default. */
7493 It is implementation-defined whether a plain (neither
7494 explicitly signed or unsigned) char, short, int, or long
7495 bit-field is signed or unsigned.
7497 Naturally, we extend this to long long as well. Note that
7498 this does not include wchar_t. */
7499 || (bitfield && !flag_signed_bitfields
7501 /* A typedef for plain `int' without `signed' can be
7502 controlled just like plain `int', but a typedef for
7503 `signed int' cannot be so controlled. */
7505 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7506 && TREE_CODE (type) == INTEGER_TYPE
7507 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7510 type = long_long_unsigned_type_node;
7512 type = long_unsigned_type_node;
7514 type = short_unsigned_type_node;
7515 else if (type == char_type_node)
7516 type = unsigned_char_type_node;
7517 else if (typedef_decl)
7518 type = unsigned_type_for (type);
7520 type = unsigned_type_node;
7522 else if (signed_p && type == char_type_node)
7523 type = signed_char_type_node;
7525 type = long_long_integer_type_node;
7527 type = long_integer_type_node;
7529 type = short_integer_type_node;
7531 if (declspecs->specs[(int)ds_complex])
7533 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7534 error ("complex invalid for %qs", name);
7535 /* If we just have "complex", it is equivalent to
7536 "complex double", but if any modifiers at all are specified it is
7537 the complex form of TYPE. E.g, "complex short" is
7538 "complex short int". */
7540 else if (defaulted_int && ! longlong
7541 && ! (long_p || short_p || signed_p || unsigned_p))
7542 type = complex_double_type_node;
7543 else if (type == integer_type_node)
7544 type = complex_integer_type_node;
7545 else if (type == float_type_node)
7546 type = complex_float_type_node;
7547 else if (type == double_type_node)
7548 type = complex_double_type_node;
7549 else if (type == long_double_type_node)
7550 type = complex_long_double_type_node;
7552 type = build_complex_type (type);
7555 type_quals = TYPE_UNQUALIFIED;
7556 if (declspecs->specs[(int)ds_const])
7557 type_quals |= TYPE_QUAL_CONST;
7558 if (declspecs->specs[(int)ds_volatile])
7559 type_quals |= TYPE_QUAL_VOLATILE;
7560 if (declspecs->specs[(int)ds_restrict])
7561 type_quals |= TYPE_QUAL_RESTRICT;
7562 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7563 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7566 if (TREE_CODE (type) == FUNCTION_TYPE
7567 && type_quals != TYPE_UNQUALIFIED)
7569 /* This was an error in C++98 (cv-qualifiers cannot be added to
7570 a function type), but DR 295 makes the code well-formed by
7571 dropping the extra qualifiers. */
7574 tree bad_type = build_qualified_type (type, type_quals);
7575 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7578 type_quals = TYPE_UNQUALIFIED;
7580 type_quals |= cp_type_quals (type);
7581 type = cp_build_qualified_type_real
7582 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7583 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7584 /* We might have ignored or rejected some of the qualifiers. */
7585 type_quals = cp_type_quals (type);
7588 inlinep = !! declspecs->specs[(int)ds_inline];
7589 virtualp = !! declspecs->specs[(int)ds_virtual];
7590 explicitp = !! declspecs->specs[(int)ds_explicit];
7592 storage_class = declspecs->storage_class;
7593 if (storage_class == sc_static)
7594 staticp = 1 + (decl_context == FIELD);
7596 if (virtualp && staticp == 2)
7598 error ("member %qD cannot be declared both virtual and static", dname);
7599 storage_class = sc_none;
7602 friendp = !! declspecs->specs[(int)ds_friend];
7604 if (dependent_name && !friendp)
7606 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7607 return error_mark_node;
7610 /* Issue errors about use of storage classes for parameters. */
7611 if (decl_context == PARM)
7613 if (declspecs->specs[(int)ds_typedef])
7615 error ("typedef declaration invalid in parameter declaration");
7616 return error_mark_node;
7618 else if (storage_class == sc_static
7619 || storage_class == sc_extern
7621 error ("storage class specifiers invalid in parameter declarations");
7624 /* Give error if `virtual' is used outside of class declaration. */
7626 && (current_class_name == NULL_TREE || decl_context != FIELD))
7628 error ("virtual outside class declaration");
7632 /* Static anonymous unions are dealt with here. */
7633 if (staticp && decl_context == TYPENAME
7635 && ANON_AGGR_TYPE_P (declspecs->type))
7636 decl_context = FIELD;
7638 /* Warn about storage classes that are invalid for certain
7639 kinds of declarations (parameters, typenames, etc.). */
7642 && storage_class != sc_extern
7643 && storage_class != sc_static)
7644 || declspecs->specs[(int)ds_typedef]))
7646 error ("multiple storage classes in declaration of %qs", name);
7649 if (declspecs->conflicting_specifiers_p)
7651 error ("conflicting specifiers in declaration of %qs", name);
7652 storage_class = sc_none;
7654 else if (decl_context != NORMAL
7655 && ((storage_class != sc_none
7656 && storage_class != sc_mutable)
7659 if ((decl_context == PARM || decl_context == CATCHPARM)
7660 && (storage_class == sc_register
7661 || storage_class == sc_auto))
7663 else if (declspecs->specs[(int)ds_typedef])
7665 else if (decl_context == FIELD
7666 /* C++ allows static class elements. */
7667 && storage_class == sc_static)
7668 /* C++ also allows inlines and signed and unsigned elements,
7669 but in those cases we don't come in here. */
7673 if (decl_context == FIELD)
7674 error ("storage class specified for %qs", name);
7677 if (decl_context == PARM || decl_context == CATCHPARM)
7678 error ("storage class specified for parameter %qs", name);
7680 error ("storage class specified for typename");
7682 if (storage_class == sc_register
7683 || storage_class == sc_auto
7684 || storage_class == sc_extern
7686 storage_class = sc_none;
7689 else if (storage_class == sc_extern && initialized
7692 if (toplevel_bindings_p ())
7694 /* It's common practice (and completely valid) to have a const
7695 be initialized and declared extern. */
7696 if (!(type_quals & TYPE_QUAL_CONST))
7697 warning (0, "%qs initialized and declared %<extern%>", name);
7700 error ("%qs has both %<extern%> and initializer", name);
7702 else if (storage_class == sc_extern && funcdef_flag
7703 && ! toplevel_bindings_p ())
7704 error ("nested function %qs declared %<extern%>", name);
7705 else if (toplevel_bindings_p ())
7707 if (storage_class == sc_auto)
7708 error ("top-level declaration of %qs specifies %<auto%>", name);
7711 && storage_class != sc_extern
7712 && storage_class != sc_static)
7714 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7719 if (storage_class && friendp)
7720 error ("storage class specifiers invalid in friend function declarations");
7723 unqualified_id = NULL_TREE;
7726 unqualified_id = id_declarator->u.id.unqualified_name;
7727 switch (TREE_CODE (unqualified_id))
7731 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7734 case IDENTIFIER_NODE:
7735 case TEMPLATE_ID_EXPR:
7743 /* Determine the type of the entity declared by recurring on the
7745 for (; declarator; declarator = declarator->declarator)
7747 const cp_declarator *inner_declarator;
7750 if (type == error_mark_node)
7751 return error_mark_node;
7753 attrs = declarator->attributes;
7759 if (declarator == NULL || declarator->kind == cdk_id)
7760 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7761 if (declarator->kind == cdk_function)
7762 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7763 if (declarator->kind == cdk_array)
7764 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7765 returned_attrs = decl_attributes (&type,
7766 chainon (returned_attrs, attrs),
7770 if (declarator->kind == cdk_id)
7773 inner_declarator = declarator->declarator;
7775 switch (declarator->kind)
7778 type = create_array_type_for_decl (dname, type,
7779 declarator->u.array.bounds);
7787 /* Declaring a function type.
7788 Make sure we have a valid type for the function to return. */
7790 if (type_quals != TYPE_UNQUALIFIED)
7792 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
7793 warning (OPT_Wreturn_type,
7794 "type qualifiers ignored on function return type");
7795 /* We now know that the TYPE_QUALS don't apply to the
7796 decl, but to its return type. */
7797 type_quals = TYPE_UNQUALIFIED;
7798 set_no_warning = true;
7801 /* Warn about some types functions can't return. */
7803 if (TREE_CODE (type) == FUNCTION_TYPE)
7805 error ("%qs declared as function returning a function", name);
7806 type = integer_type_node;
7808 if (TREE_CODE (type) == ARRAY_TYPE)
7810 error ("%qs declared as function returning an array", name);
7811 type = integer_type_node;
7814 /* Pick up type qualifiers which should be applied to `this'. */
7815 memfn_quals = declarator->u.function.qualifiers;
7817 /* Pick up the exception specifications. */
7818 raises = declarator->u.function.exception_specification;
7820 /* Say it's a definition only for the CALL_EXPR
7821 closest to the identifier. */
7822 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7824 if (ctype == NULL_TREE
7825 && decl_context == FIELD
7827 && (friendp == 0 || dname == current_class_name))
7828 ctype = current_class_type;
7830 if (ctype && (sfk == sfk_constructor
7831 || sfk == sfk_destructor))
7833 /* We are within a class's scope. If our declarator name
7834 is the same as the class name, and we are defining
7835 a function, then it is a constructor/destructor, and
7836 therefore returns a void type. */
7838 /* ISO C++ 12.4/2. A destructor may not be declared
7839 const or volatile. A destructor may not be
7842 ISO C++ 12.1. A constructor may not be declared
7843 const or volatile. A constructor may not be
7844 virtual. A constructor may not be static. */
7846 error ((flags == DTOR_FLAG)
7847 ? "destructor cannot be static member function"
7848 : "constructor cannot be static member function");
7851 error ((flags == DTOR_FLAG)
7852 ? "destructors may not be cv-qualified"
7853 : "constructors may not be cv-qualified");
7854 memfn_quals = TYPE_UNQUALIFIED;
7857 if (decl_context == FIELD
7858 && !member_function_or_else (ctype,
7861 return error_mark_node;
7863 if (flags != DTOR_FLAG)
7865 /* It's a constructor. */
7870 pedwarn ("constructors cannot be declared virtual");
7873 if (decl_context == FIELD
7874 && sfk != sfk_constructor)
7875 return error_mark_node;
7877 if (decl_context == FIELD)
7883 error ("can't initialize friend function %qs", name);
7886 /* Cannot be both friend and virtual. */
7887 error ("virtual functions cannot be friends");
7890 if (decl_context == NORMAL)
7891 error ("friend declaration not in class definition");
7892 if (current_function_decl && funcdef_flag)
7893 error ("can't define friend function %qs in a local "
7898 arg_types = grokparms (declarator->u.function.parameters,
7901 if (inner_declarator
7902 && inner_declarator->kind == cdk_id
7903 && inner_declarator->u.id.sfk == sfk_destructor
7904 && arg_types != void_list_node)
7906 error ("destructors may not have parameters");
7907 arg_types = void_list_node;
7911 type = build_function_type (type, arg_types);
7918 /* Filter out pointers-to-references and references-to-references.
7919 We can get these if a TYPE_DECL is used. */
7921 if (TREE_CODE (type) == REFERENCE_TYPE)
7923 if (declarator->kind != cdk_reference)
7925 error ("cannot declare pointer to %q#T", type);
7926 type = TREE_TYPE (type);
7929 /* In C++0x, we allow reference to reference declarations
7930 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
7931 and template type arguments [14.3.1/4 temp.arg.type]. The
7932 check for direct reference to reference declarations, which
7933 are still forbidden, occurs below. Reasoning behind the change
7934 can be found in DR106, DR540, and the rvalue reference
7936 else if (cxx_dialect == cxx98)
7938 error ("cannot declare reference to %q#T", type);
7939 type = TREE_TYPE (type);
7942 else if (VOID_TYPE_P (type))
7944 if (declarator->kind == cdk_reference)
7945 error ("cannot declare reference to %q#T", type);
7946 else if (declarator->kind == cdk_ptrmem)
7947 error ("cannot declare pointer to %q#T member", type);
7950 /* We now know that the TYPE_QUALS don't apply to the decl,
7951 but to the target of the pointer. */
7952 type_quals = TYPE_UNQUALIFIED;
7954 if (declarator->kind == cdk_ptrmem
7955 && (TREE_CODE (type) == FUNCTION_TYPE || memfn_quals))
7957 memfn_quals |= cp_type_quals (type);
7958 type = build_memfn_type (type,
7959 declarator->u.pointer.class_type,
7961 memfn_quals = TYPE_UNQUALIFIED;
7964 if (declarator->kind == cdk_reference)
7966 /* In C++0x, the type we are creating a reference to might be
7967 a typedef which is itself a reference type. In that case,
7968 we follow the reference collapsing rules in
7969 [7.1.3/8 dcl.typedef] to create the final reference type:
7971 "If a typedef TD names a type that is a reference to a type
7972 T, an attempt to create the type 'lvalue reference to cv TD'
7973 creates the type 'lvalue reference to T,' while an attempt
7974 to create the type "rvalue reference to cv TD' creates the
7977 if (!VOID_TYPE_P (type))
7978 type = cp_build_reference_type
7979 ((TREE_CODE (type) == REFERENCE_TYPE
7980 ? TREE_TYPE (type) : type),
7981 (declarator->u.reference.rvalue_ref
7982 && (TREE_CODE(type) != REFERENCE_TYPE
7983 || TYPE_REF_IS_RVALUE (type))));
7985 /* In C++0x, we need this check for direct reference to
7986 reference declarations, which are forbidden by
7987 [8.3.2/5 dcl.ref]. Reference to reference declarations
7988 are only allowed indirectly through typedefs and template
7989 type arguments. Example:
7991 void foo(int & &); // invalid ref-to-ref decl
7993 typedef int & int_ref;
7994 void foo(int_ref &); // valid ref-to-ref decl
7996 if (inner_declarator && inner_declarator->kind == cdk_reference)
7997 error ("cannot declare reference to %q#T, which is not "
7998 "a typedef or a template type argument", type);
8000 else if (TREE_CODE (type) == METHOD_TYPE)
8001 type = build_ptrmemfunc_type (build_pointer_type (type));
8002 else if (declarator->kind == cdk_ptrmem)
8004 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8006 if (declarator->u.pointer.class_type == error_mark_node)
8007 /* We will already have complained. */
8008 type = error_mark_node;
8010 type = build_ptrmem_type (declarator->u.pointer.class_type,
8014 type = build_pointer_type (type);
8016 /* Process a list of type modifier keywords (such as
8017 const or volatile) that were given inside the `*' or `&'. */
8019 if (declarator->u.pointer.qualifiers)
8022 = cp_build_qualified_type (type,
8023 declarator->u.pointer.qualifiers);
8024 type_quals = cp_type_quals (type);
8037 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8038 && TREE_CODE (type) != FUNCTION_TYPE
8039 && TREE_CODE (type) != METHOD_TYPE)
8041 error ("template-id %qD used as a declarator",
8043 unqualified_id = dname;
8046 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8047 qualified with a class-name, turn it into a METHOD_TYPE, unless
8048 we know that the function is static. We take advantage of this
8049 opportunity to do other processing that pertains to entities
8050 explicitly declared to be class members. Note that if DECLARATOR
8051 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8052 would not have exited the loop above. */
8054 && declarator->u.id.qualifying_scope
8055 && TYPE_P (declarator->u.id.qualifying_scope))
8059 ctype = declarator->u.id.qualifying_scope;
8060 ctype = TYPE_MAIN_VARIANT (ctype);
8062 while (t != NULL_TREE && CLASS_TYPE_P (t))
8064 /* You're supposed to have one `template <...>' for every
8065 template class, but you don't need one for a full
8066 specialization. For example:
8068 template <class T> struct S{};
8069 template <> struct S<int> { void f(); };
8070 void S<int>::f () {}
8072 is correct; there shouldn't be a `template <>' for the
8073 definition of `S<int>::f'. */
8074 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8075 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8076 /* T is an explicit (not partial) specialization. All
8077 containing classes must therefore also be explicitly
8080 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8081 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8082 template_count += 1;
8084 t = TYPE_MAIN_DECL (t);
8085 t = DECL_CONTEXT (t);
8088 if (ctype == current_class_type)
8092 pedwarn ("member functions are implicitly friends of their class");
8096 pedwarn ("extra qualification %<%T::%> on member %qs",
8099 else if (/* If the qualifying type is already complete, then we
8100 can skip the following checks. */
8101 !COMPLETE_TYPE_P (ctype)
8102 && (/* If the function is being defined, then
8103 qualifying type must certainly be complete. */
8105 /* A friend declaration of "T::f" is OK, even if
8106 "T" is a template parameter. But, if this
8107 function is not a friend, the qualifying type
8109 || (!friendp && !CLASS_TYPE_P (ctype))
8110 /* For a declaration, the type need not be
8111 complete, if either it is dependent (since there
8112 is no meaningful definition of complete in that
8113 case) or the qualifying class is currently being
8115 || !(dependent_type_p (ctype)
8116 || currently_open_class (ctype)))
8117 /* Check that the qualifying type is complete. */
8118 && !complete_type_or_else (ctype, NULL_TREE))
8119 return error_mark_node;
8120 else if (TREE_CODE (type) == FUNCTION_TYPE)
8122 tree sname = declarator->u.id.unqualified_name;
8124 if (current_class_type
8125 && (!friendp || funcdef_flag))
8128 ? "cannot define member function %<%T::%s%> within %<%T%>"
8129 : "cannot declare member function %<%T::%s%> within %<%T%>",
8130 ctype, name, current_class_type);
8131 return error_mark_node;
8134 if (TREE_CODE (sname) == IDENTIFIER_NODE
8135 && NEW_DELETE_OPNAME_P (sname))
8136 /* Overloaded operator new and operator delete
8137 are always static functions. */
8140 type = build_memfn_type (type, ctype, memfn_quals);
8142 else if (declspecs->specs[(int)ds_typedef]
8143 && current_class_type)
8145 error ("cannot declare member %<%T::%s%> within %qT",
8146 ctype, name, current_class_type);
8147 return error_mark_node;
8151 /* Now TYPE has the actual type. */
8156 *attrlist = chainon (returned_attrs, *attrlist);
8158 attrlist = &returned_attrs;
8161 /* Handle parameter packs. */
8162 if (parameter_pack_p)
8164 if (decl_context == PARM)
8165 /* Turn the type into a pack expansion.*/
8166 type = make_pack_expansion (type);
8168 error ("non-parameter %qs cannot be a parameter pack", name);
8171 /* Did array size calculations overflow? */
8173 if (TREE_CODE (type) == ARRAY_TYPE
8174 && COMPLETE_TYPE_P (type)
8175 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8176 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8178 error ("size of array %qs is too large", name);
8179 /* If we proceed with the array type as it is, we'll eventually
8180 crash in tree_low_cst(). */
8181 type = error_mark_node;
8184 if ((decl_context == FIELD || decl_context == PARM)
8185 && !processing_template_decl
8186 && variably_modified_type_p (type, NULL_TREE))
8188 if (decl_context == FIELD)
8189 error ("data member may not have variably modified type %qT", type);
8191 error ("parameter may not have variably modified type %qT", type);
8192 type = error_mark_node;
8195 if (explicitp == 1 || (explicitp && friendp))
8197 /* [dcl.fct.spec] The explicit specifier shall only be used in
8198 declarations of constructors within a class definition. */
8199 error ("only declarations of constructors can be %<explicit%>");
8203 if (storage_class == sc_mutable)
8205 if (decl_context != FIELD || friendp)
8207 error ("non-member %qs cannot be declared %<mutable%>", name);
8208 storage_class = sc_none;
8210 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8212 error ("non-object member %qs cannot be declared %<mutable%>", name);
8213 storage_class = sc_none;
8215 else if (TREE_CODE (type) == FUNCTION_TYPE
8216 || TREE_CODE (type) == METHOD_TYPE)
8218 error ("function %qs cannot be declared %<mutable%>", name);
8219 storage_class = sc_none;
8223 error ("static %qs cannot be declared %<mutable%>", name);
8224 storage_class = sc_none;
8226 else if (type_quals & TYPE_QUAL_CONST)
8228 error ("const %qs cannot be declared %<mutable%>", name);
8229 storage_class = sc_none;
8233 /* If this is declaring a typedef name, return a TYPE_DECL. */
8234 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8238 /* Note that the grammar rejects storage classes
8239 in typenames, fields or parameters. */
8240 if (current_lang_name == lang_name_java)
8241 TYPE_FOR_JAVA (type) = 1;
8243 /* This declaration:
8245 typedef void f(int) const;
8247 declares a function type which is not a member of any
8248 particular class, but which is cv-qualified; for
8249 example "f S::*" declares a pointer to a const-qualified
8250 member function of S. We record the cv-qualification in the
8252 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8254 type = cp_build_qualified_type (type, memfn_quals);
8256 /* We have now dealt with these qualifiers. */
8257 memfn_quals = TYPE_UNQUALIFIED;
8260 if (decl_context == FIELD)
8261 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8263 decl = build_decl (TYPE_DECL, unqualified_id, type);
8264 if (id_declarator && declarator->u.id.qualifying_scope)
8265 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8267 if (decl_context != FIELD)
8269 if (!current_function_decl)
8270 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8271 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8272 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8273 (current_function_decl)))
8274 /* The TYPE_DECL is "abstract" because there will be
8275 clones of this constructor/destructor, and there will
8276 be copies of this TYPE_DECL generated in those
8278 DECL_ABSTRACT (decl) = 1;
8280 else if (constructor_name_p (unqualified_id, current_class_type))
8281 pedwarn ("ISO C++ forbids nested type %qD with same name "
8282 "as enclosing class",
8285 /* If the user declares "typedef struct {...} foo" then the
8286 struct will have an anonymous name. Fill that name in now.
8287 Nothing can refer to it, so nothing needs know about the name
8289 if (type != error_mark_node
8292 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8293 && TYPE_ANONYMOUS_P (type)
8294 /* Don't do this if there are attributes. */
8295 && (!attrlist || !*attrlist)
8296 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8298 tree oldname = TYPE_NAME (type);
8301 /* Replace the anonymous name with the real name everywhere. */
8302 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8303 if (TYPE_NAME (t) == oldname)
8304 TYPE_NAME (t) = decl;
8306 if (TYPE_LANG_SPECIFIC (type))
8307 TYPE_WAS_ANONYMOUS (type) = 1;
8309 /* If this is a typedef within a template class, the nested
8310 type is a (non-primary) template. The name for the
8311 template needs updating as well. */
8312 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8313 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8314 = TYPE_IDENTIFIER (type);
8316 /* FIXME remangle member functions; member functions of a
8317 type with external linkage have external linkage. */
8321 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8322 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8324 bad_specifiers (decl, "type", virtualp,
8325 memfn_quals != TYPE_UNQUALIFIED,
8326 inlinep, friendp, raises != NULL_TREE);
8331 /* Detect the case of an array type of unspecified size
8332 which came, as such, direct from a typedef name.
8333 We must copy the type, so that the array's domain can be
8334 individually set by the object's initializer. */
8336 if (type && typedef_type
8337 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8338 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8339 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8341 /* Detect where we're using a typedef of function type to declare a
8342 function. PARMS will not be set, so we must create it now. */
8344 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8346 tree decls = NULL_TREE;
8349 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8351 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8353 TREE_CHAIN (decl) = decls;
8357 parms = nreverse (decls);
8359 if (decl_context != TYPENAME)
8361 /* A cv-qualifier-seq shall only be part of the function type
8362 for a non-static member function. [8.3.5/4 dcl.fct] */
8363 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8364 && (current_class_type == NULL_TREE || staticp) )
8367 ? G_("qualified function types cannot be used to "
8368 "declare static member functions")
8369 : G_("qualified function types cannot be used to "
8370 "declare free functions"));
8371 type = TYPE_MAIN_VARIANT (type);
8374 /* The qualifiers on the function type become the qualifiers on
8375 the non-static member function. */
8376 memfn_quals |= cp_type_quals (type);
8380 /* If this is a type name (such as, in a cast or sizeof),
8381 compute the type and return it now. */
8383 if (decl_context == TYPENAME)
8385 /* Note that the grammar rejects storage classes
8386 in typenames, fields or parameters. */
8387 if (type_quals != TYPE_UNQUALIFIED)
8388 type_quals = TYPE_UNQUALIFIED;
8390 /* Special case: "friend class foo" looks like a TYPENAME context. */
8393 if (type_quals != TYPE_UNQUALIFIED)
8395 error ("type qualifiers specified for friend class declaration");
8396 type_quals = TYPE_UNQUALIFIED;
8400 error ("%<inline%> specified for friend class declaration");
8406 /* Don't allow friend declaration without a class-key. */
8407 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8408 pedwarn ("template parameters cannot be friends");
8409 else if (TREE_CODE (type) == TYPENAME_TYPE)
8410 pedwarn ("friend declaration requires class-key, "
8411 "i.e. %<friend class %T::%D%>",
8412 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8414 pedwarn ("friend declaration requires class-key, "
8415 "i.e. %<friend %#T%>",
8419 /* Only try to do this stuff if we didn't already give up. */
8420 if (type != integer_type_node)
8422 /* A friendly class? */
8423 if (current_class_type)
8424 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8427 error ("trying to make class %qT a friend of global scope",
8430 type = void_type_node;
8433 else if (memfn_quals)
8435 if (ctype == NULL_TREE)
8437 if (TREE_CODE (type) != METHOD_TYPE)
8438 error ("invalid qualifiers on non-member function type");
8440 ctype = TYPE_METHOD_BASETYPE (type);
8443 type = build_memfn_type (type, ctype, memfn_quals);
8448 else if (unqualified_id == NULL_TREE && decl_context != PARM
8449 && decl_context != CATCHPARM
8450 && TREE_CODE (type) != UNION_TYPE
8453 error ("abstract declarator %qT used as declaration", type);
8454 return error_mark_node;
8457 /* Only functions may be declared using an operator-function-id. */
8459 && IDENTIFIER_OPNAME_P (unqualified_id)
8460 && TREE_CODE (type) != FUNCTION_TYPE
8461 && TREE_CODE (type) != METHOD_TYPE)
8463 error ("declaration of %qD as non-function", unqualified_id);
8464 return error_mark_node;
8467 /* We don't check parameter types here because we can emit a better
8468 error message later. */
8469 if (decl_context != PARM)
8471 type = check_var_type (unqualified_id, type);
8472 if (type == error_mark_node)
8473 return error_mark_node;
8476 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8477 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8479 if (decl_context == PARM || decl_context == CATCHPARM)
8481 if (ctype || in_namespace)
8482 error ("cannot use %<::%> in parameter declaration");
8484 /* A parameter declared as an array of T is really a pointer to T.
8485 One declared as a function is really a pointer to a function.
8486 One declared as a member is really a pointer to member. */
8488 if (TREE_CODE (type) == ARRAY_TYPE)
8490 /* Transfer const-ness of array into that of type pointed to. */
8491 type = build_pointer_type (TREE_TYPE (type));
8492 type_quals = TYPE_UNQUALIFIED;
8494 else if (TREE_CODE (type) == FUNCTION_TYPE)
8495 type = build_pointer_type (type);
8501 if (decl_context == PARM)
8503 decl = cp_build_parm_decl (unqualified_id, type);
8505 bad_specifiers (decl, "parameter", virtualp,
8506 memfn_quals != TYPE_UNQUALIFIED,
8507 inlinep, friendp, raises != NULL_TREE);
8509 else if (decl_context == FIELD)
8511 /* The C99 flexible array extension. */
8512 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8513 && TYPE_DOMAIN (type) == NULL_TREE)
8515 tree itype = compute_array_index_type (dname, integer_zero_node);
8516 type = build_cplus_array_type (TREE_TYPE (type), itype);
8519 if (type == error_mark_node)
8521 /* Happens when declaring arrays of sizes which
8522 are error_mark_node, for example. */
8525 else if (in_namespace && !friendp)
8527 /* Something like struct S { int N::j; }; */
8528 error ("invalid use of %<::%>");
8529 return error_mark_node;
8531 else if (TREE_CODE (type) == FUNCTION_TYPE)
8534 tree function_context;
8538 if (ctype == NULL_TREE)
8539 ctype = current_class_type;
8541 if (ctype == NULL_TREE)
8543 error ("can't make %qD into a method -- not in a class",
8545 return error_mark_node;
8548 /* ``A union may [ ... ] not [ have ] virtual functions.''
8550 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8552 error ("function %qD declared virtual inside a union",
8554 return error_mark_node;
8557 if (NEW_DELETE_OPNAME_P (unqualified_id))
8561 error ("%qD cannot be declared virtual, since it "
8567 else if (staticp < 2)
8568 type = build_memfn_type (type, ctype, memfn_quals);
8571 /* Check that the name used for a destructor makes sense. */
8572 if (sfk == sfk_destructor)
8576 gcc_assert (friendp);
8577 error ("expected qualified name in friend declaration "
8578 "for destructor %qD",
8579 id_declarator->u.id.unqualified_name);
8580 return error_mark_node;
8583 if (!same_type_p (TREE_OPERAND
8584 (id_declarator->u.id.unqualified_name, 0),
8587 error ("declaration of %qD as member of %qT",
8588 id_declarator->u.id.unqualified_name, ctype);
8589 return error_mark_node;
8593 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8594 function_context = (ctype != NULL_TREE) ?
8595 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8596 publicp = (! friendp || ! staticp)
8597 && function_context == NULL_TREE;
8598 decl = grokfndecl (ctype, type,
8599 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8600 ? unqualified_id : dname,
8603 virtualp, flags, memfn_quals, raises,
8604 friendp ? -1 : 0, friendp, publicp, inlinep,
8606 funcdef_flag, template_count, in_namespace, attrlist);
8607 if (decl == NULL_TREE)
8608 return error_mark_node;
8610 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8611 /* The decl and setting of decl_attr is also turned off. */
8612 decl = build_decl_attribute_variant (decl, decl_attr);
8615 /* [class.conv.ctor]
8617 A constructor declared without the function-specifier
8618 explicit that can be called with a single parameter
8619 specifies a conversion from the type of its first
8620 parameter to the type of its class. Such a constructor
8621 is called a converting constructor. */
8623 DECL_NONCONVERTING_P (decl) = 1;
8624 else if (DECL_CONSTRUCTOR_P (decl))
8626 /* The constructor can be called with exactly one
8627 parameter if there is at least one parameter, and
8628 any subsequent parameters have default arguments.
8629 Ignore any compiler-added parms. */
8630 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8632 if (arg_types == void_list_node
8634 && TREE_CHAIN (arg_types)
8635 && TREE_CHAIN (arg_types) != void_list_node
8636 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8637 DECL_NONCONVERTING_P (decl) = 1;
8640 else if (TREE_CODE (type) == METHOD_TYPE)
8642 /* We only get here for friend declarations of
8643 members of other classes. */
8644 /* All method decls are public, so tell grokfndecl to set
8645 TREE_PUBLIC, also. */
8646 decl = grokfndecl (ctype, type,
8647 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8648 ? unqualified_id : dname,
8651 virtualp, flags, memfn_quals, raises,
8652 friendp ? -1 : 0, friendp, 1, 0, sfk,
8653 funcdef_flag, template_count, in_namespace,
8655 if (decl == NULL_TREE)
8656 return error_mark_node;
8658 else if (!staticp && !dependent_type_p (type)
8659 && !COMPLETE_TYPE_P (complete_type (type))
8660 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8663 error ("field %qD has incomplete type", unqualified_id);
8665 error ("name %qT has incomplete type", type);
8667 /* If we're instantiating a template, tell them which
8668 instantiation made the field's type be incomplete. */
8669 if (current_class_type
8670 && TYPE_NAME (current_class_type)
8671 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8673 && declspecs->type == type)
8674 error (" in instantiation of template %qT",
8675 current_class_type);
8677 return error_mark_node;
8683 error ("%qE is neither function nor member function; "
8684 "cannot be declared friend", unqualified_id);
8692 /* Friends are treated specially. */
8693 if (ctype == current_class_type)
8694 ; /* We already issued a pedwarn. */
8695 else if (decl && DECL_NAME (decl))
8697 if (template_class_depth (current_class_type) == 0)
8699 decl = check_explicit_specialization
8700 (unqualified_id, decl, template_count,
8701 2 * funcdef_flag + 4);
8702 if (decl == error_mark_node)
8703 return error_mark_node;
8706 decl = do_friend (ctype, unqualified_id, decl,
8712 return error_mark_node;
8715 /* Structure field. It may not be a function, except for C++. */
8717 if (decl == NULL_TREE)
8723 /* An attempt is being made to initialize a non-static
8724 member. But, from [class.mem]:
8726 4 A member-declarator can contain a
8727 constant-initializer only if it declares a static
8728 member (_class.static_) of integral or enumeration
8729 type, see _class.static.data_.
8731 This used to be relatively common practice, but
8732 the rest of the compiler does not correctly
8733 handle the initialization unless the member is
8734 static so we make it static below. */
8735 pedwarn ("ISO C++ forbids initialization of member %qD",
8737 pedwarn ("making %qD static", unqualified_id);
8741 if (uses_template_parms (type))
8742 /* We'll check at instantiation time. */
8744 else if (check_static_variable_definition (unqualified_id,
8746 /* If we just return the declaration, crashes
8747 will sometimes occur. We therefore return
8748 void_type_node, as if this was a friend
8749 declaration, to cause callers to completely
8750 ignore this declaration. */
8751 return error_mark_node;
8756 /* C++ allows static class members. All other work
8757 for this is done by grokfield. */
8758 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8759 set_linkage_for_static_data_member (decl);
8760 /* Even if there is an in-class initialization, DECL
8761 is considered undefined until an out-of-class
8762 definition is provided. */
8763 DECL_EXTERNAL (decl) = 1;
8766 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
8770 decl = build_decl (FIELD_DECL, unqualified_id, type);
8771 DECL_NONADDRESSABLE_P (decl) = bitfield;
8772 if (bitfield && !unqualified_id)
8773 TREE_NO_WARNING (decl) = 1;
8775 if (storage_class == sc_mutable)
8777 DECL_MUTABLE_P (decl) = 1;
8778 storage_class = sc_none;
8782 bad_specifiers (decl, "field", virtualp,
8783 memfn_quals != TYPE_UNQUALIFIED,
8784 inlinep, friendp, raises != NULL_TREE);
8787 else if (TREE_CODE (type) == FUNCTION_TYPE
8788 || TREE_CODE (type) == METHOD_TYPE)
8793 if (!unqualified_id)
8794 return error_mark_node;
8796 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8797 original_name = dname;
8799 original_name = unqualified_id;
8801 if (storage_class == sc_auto)
8802 error ("storage class %<auto%> invalid for function %qs", name);
8803 else if (storage_class == sc_register)
8804 error ("storage class %<register%> invalid for function %qs", name);
8806 error ("storage class %<__thread%> invalid for function %qs", name);
8808 /* Function declaration not at top level.
8809 Storage classes other than `extern' are not allowed
8810 and `extern' makes no difference. */
8811 if (! toplevel_bindings_p ()
8812 && (storage_class == sc_static
8813 || declspecs->specs[(int)ds_inline])
8816 if (storage_class == sc_static)
8817 pedwarn ("%<static%> specified invalid for function %qs "
8818 "declared out of global scope", name);
8820 pedwarn ("%<inline%> specifier invalid for function %qs "
8821 "declared out of global scope", name);
8824 if (ctype == NULL_TREE)
8828 error ("virtual non-class function %qs", name);
8832 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8833 && !NEW_DELETE_OPNAME_P (original_name))
8834 type = build_method_type_directly (ctype,
8836 TYPE_ARG_TYPES (type));
8838 /* Record presence of `static'. */
8839 publicp = (ctype != NULL_TREE
8840 || storage_class == sc_extern
8841 || storage_class != sc_static);
8843 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8844 virtualp, flags, memfn_quals, raises,
8846 publicp, inlinep, sfk, funcdef_flag,
8847 template_count, in_namespace, attrlist);
8848 if (decl == NULL_TREE)
8849 return error_mark_node;
8853 int invalid_static = 0;
8855 /* Don't allow a static member function in a class, and forbid
8856 declaring main to be static. */
8857 if (TREE_CODE (type) == METHOD_TYPE)
8859 pedwarn ("cannot declare member function %qD to have "
8860 "static linkage", decl);
8863 else if (current_function_decl)
8865 /* FIXME need arm citation */
8866 error ("cannot declare static function inside another function");
8873 storage_class = sc_none;
8879 /* It's a variable. */
8881 /* An uninitialized decl with `extern' is a reference. */
8882 decl = grokvardecl (type, unqualified_id,
8885 (type_quals & TYPE_QUAL_CONST) != 0,
8886 ctype ? ctype : in_namespace);
8887 bad_specifiers (decl, "variable", virtualp,
8888 memfn_quals != TYPE_UNQUALIFIED,
8889 inlinep, friendp, raises != NULL_TREE);
8893 DECL_CONTEXT (decl) = ctype;
8896 pedwarn ("%<static%> may not be used when defining "
8897 "(as opposed to declaring) a static data member");
8899 storage_class = sc_none;
8901 if (storage_class == sc_register && TREE_STATIC (decl))
8903 error ("static member %qD declared %<register%>", decl);
8904 storage_class = sc_none;
8906 if (storage_class == sc_extern && pedantic)
8908 pedwarn ("cannot explicitly declare member %q#D to have "
8911 storage_class = sc_none;
8916 /* Record `register' declaration for warnings on &
8917 and in case doing stupid register allocation. */
8919 if (storage_class == sc_register)
8920 DECL_REGISTER (decl) = 1;
8921 else if (storage_class == sc_extern)
8922 DECL_THIS_EXTERN (decl) = 1;
8923 else if (storage_class == sc_static)
8924 DECL_THIS_STATIC (decl) = 1;
8926 /* Record constancy and volatility. There's no need to do this
8927 when processing a template; we'll do this for the instantiated
8928 declaration based on the type of DECL. */
8929 if (!processing_template_decl)
8930 cp_apply_type_quals_to_decl (type_quals, decl);
8933 TREE_NO_WARNING (decl) = 1;
8939 /* Subroutine of start_function. Ensure that each of the parameter
8940 types (as listed in PARMS) is complete, as is required for a
8941 function definition. */
8944 require_complete_types_for_parms (tree parms)
8946 for (; parms; parms = TREE_CHAIN (parms))
8948 if (dependent_type_p (TREE_TYPE (parms)))
8950 if (!VOID_TYPE_P (TREE_TYPE (parms))
8951 && complete_type_or_else (TREE_TYPE (parms), parms))
8953 relayout_decl (parms);
8954 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8957 /* grokparms or complete_type_or_else will have already issued
8959 TREE_TYPE (parms) = error_mark_node;
8963 /* Returns nonzero if T is a local variable. */
8966 local_variable_p (tree t)
8968 if ((TREE_CODE (t) == VAR_DECL
8969 /* A VAR_DECL with a context that is a _TYPE is a static data
8971 && !TYPE_P (CP_DECL_CONTEXT (t))
8972 /* Any other non-local variable must be at namespace scope. */
8973 && !DECL_NAMESPACE_SCOPE_P (t))
8974 || (TREE_CODE (t) == PARM_DECL))
8980 /* Returns nonzero if T is an automatic local variable or a label.
8981 (These are the declarations that need to be remapped when the code
8982 containing them is duplicated.) */
8985 nonstatic_local_decl_p (tree t)
8987 return ((local_variable_p (t) && !TREE_STATIC (t))
8988 || TREE_CODE (t) == LABEL_DECL
8989 || TREE_CODE (t) == RESULT_DECL);
8992 /* Like local_variable_p, but suitable for use as a tree-walking
8996 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8997 void *data ATTRIBUTE_UNUSED)
8999 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9001 else if (TYPE_P (*tp))
9008 /* Check that ARG, which is a default-argument expression for a
9009 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9010 something goes wrong. DECL may also be a _TYPE node, rather than a
9011 DECL, if there is no DECL available. */
9014 check_default_argument (tree decl, tree arg)
9019 if (TREE_CODE (arg) == DEFAULT_ARG)
9020 /* We get a DEFAULT_ARG when looking at an in-class declaration
9021 with a default argument. Ignore the argument for now; we'll
9022 deal with it after the class is complete. */
9031 decl_type = TREE_TYPE (decl);
9033 if (arg == error_mark_node
9034 || decl == error_mark_node
9035 || TREE_TYPE (arg) == error_mark_node
9036 || decl_type == error_mark_node)
9037 /* Something already went wrong. There's no need to check
9039 return error_mark_node;
9041 /* [dcl.fct.default]
9043 A default argument expression is implicitly converted to the
9045 if (!TREE_TYPE (arg)
9046 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9049 error ("default argument for %q#D has type %qT",
9050 decl, TREE_TYPE (arg));
9052 error ("default argument for parameter of type %qT has type %qT",
9053 decl_type, TREE_TYPE (arg));
9055 return error_mark_node;
9058 /* [dcl.fct.default]
9060 Local variables shall not be used in default argument
9063 The keyword `this' shall not be used in a default argument of a
9065 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
9069 error ("default argument %qE uses local variable %qD", arg, var);
9070 return error_mark_node;
9077 /* Decode the list of parameter types for a function type.
9078 Given the list of things declared inside the parens,
9079 return a list of types.
9081 If this parameter does not end with an ellipsis, we append
9084 *PARMS is set to the chain of PARM_DECLs created. */
9087 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9089 tree result = NULL_TREE;
9090 tree decls = NULL_TREE;
9091 int ellipsis = !first_parm || first_parm->ellipsis_p;
9092 cp_parameter_declarator *parm;
9094 struct pointer_set_t *unique_decls = pointer_set_create ();
9096 for (parm = first_parm; parm != NULL; parm = parm->next)
9098 tree type = NULL_TREE;
9099 tree init = parm->default_argument;
9103 if (parm == no_parameters)
9106 attrs = parm->decl_specifiers.attributes;
9107 parm->decl_specifiers.attributes = NULL_TREE;
9108 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9109 PARM, init != NULL_TREE, &attrs);
9110 if (! decl || TREE_TYPE (decl) == error_mark_node)
9114 cplus_decl_attributes (&decl, attrs, 0);
9116 type = TREE_TYPE (decl);
9117 if (VOID_TYPE_P (type))
9119 if (same_type_p (type, void_type_node)
9120 && DECL_SELF_REFERENCE_P (type)
9121 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9122 /* this is a parmlist of `(void)', which is ok. */
9124 cxx_incomplete_type_error (decl, type);
9125 /* It's not a good idea to actually create parameters of
9126 type `void'; other parts of the compiler assume that a
9127 void type terminates the parameter list. */
9128 type = error_mark_node;
9129 TREE_TYPE (decl) = error_mark_node;
9132 if (type != error_mark_node)
9134 /* Top-level qualifiers on the parameters are
9135 ignored for function types. */
9136 type = cp_build_qualified_type (type, 0);
9137 if (TREE_CODE (type) == METHOD_TYPE)
9139 error ("parameter %qD invalidly declared method type", decl);
9140 type = build_pointer_type (type);
9141 TREE_TYPE (decl) = type;
9143 else if (abstract_virtuals_error (decl, type))
9144 any_error = 1; /* Seems like a good idea. */
9145 else if (POINTER_TYPE_P (type))
9147 /* [dcl.fct]/6, parameter types cannot contain pointers
9148 (references) to arrays of unknown bound. */
9149 tree t = TREE_TYPE (type);
9150 int ptr = TYPE_PTR_P (type);
9156 else if (TREE_CODE (t) != ARRAY_TYPE)
9158 else if (!TYPE_DOMAIN (t))
9162 if (TREE_CODE (t) == ARRAY_TYPE)
9163 error ("parameter %qD includes %s to array of unknown "
9165 decl, ptr ? "pointer" : "reference", t);
9170 else if (init && !processing_template_decl)
9171 init = check_default_argument (decl, init);
9174 if (TREE_CODE (decl) == PARM_DECL
9175 && FUNCTION_PARAMETER_PACK_P (decl)
9177 error ("parameter packs must be at the end of the parameter list");
9179 if (DECL_NAME (decl))
9181 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9182 error ("multiple parameters named %qE", DECL_NAME (decl));
9184 pointer_set_insert (unique_decls, DECL_NAME (decl));
9187 TREE_CHAIN (decl) = decls;
9189 result = tree_cons (init, type, result);
9191 decls = nreverse (decls);
9192 result = nreverse (result);
9194 result = chainon (result, void_list_node);
9197 pointer_set_destroy (unique_decls);
9202 /* D is a constructor or overloaded `operator='.
9204 Let T be the class in which D is declared. Then, this function
9207 -1 if D's is an ill-formed constructor or copy assignment operator
9208 whose first parameter is of type `T'.
9209 0 if D is not a copy constructor or copy assignment
9211 1 if D is a copy constructor or copy assignment operator whose
9212 first parameter is a reference to const qualified T.
9213 2 if D is a copy constructor or copy assignment operator whose
9214 first parameter is a reference to non-const qualified T.
9216 This function can be used as a predicate. Positive values indicate
9217 a copy constructor and nonzero values indicate a copy assignment
9227 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9229 if (TREE_CODE (d) == TEMPLATE_DECL
9230 || (DECL_TEMPLATE_INFO (d)
9231 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9232 /* Instantiations of template member functions are never copy
9233 functions. Note that member functions of templated classes are
9234 represented as template functions internally, and we must
9235 accept those as copy functions. */
9238 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9242 arg_type = TREE_VALUE (args);
9243 if (arg_type == error_mark_node)
9246 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9248 /* Pass by value copy assignment operator. */
9251 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9252 && !TYPE_REF_IS_RVALUE (arg_type)
9253 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9255 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9261 args = TREE_CHAIN (args);
9263 if (args && args != void_list_node && !TREE_PURPOSE (args))
9264 /* There are more non-optional args. */
9270 /* D is a constructor or overloaded `operator='.
9272 Let T be the class in which D is declared. Then, this function
9273 returns true when D is a move constructor or move assignment
9274 operator, false otherwise. */
9281 bool result = false;
9283 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9285 if (cxx_dialect == cxx98)
9286 /* There are no move constructors if we are in C++98 mode. */
9289 if (TREE_CODE (d) == TEMPLATE_DECL
9290 || (DECL_TEMPLATE_INFO (d)
9291 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9292 /* Instantiations of template member functions are never copy
9293 functions. Note that member functions of templated classes are
9294 represented as template functions internally, and we must
9295 accept those as copy functions. */
9298 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9302 arg_type = TREE_VALUE (args);
9303 if (arg_type == error_mark_node)
9306 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9307 && TYPE_REF_IS_RVALUE (arg_type)
9308 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9312 args = TREE_CHAIN (args);
9314 if (args && args != void_list_node && !TREE_PURPOSE (args))
9315 /* There are more non-optional args. */
9321 /* Remember any special properties of member function DECL. */
9323 void grok_special_member_properties (tree decl)
9327 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9330 class_type = DECL_CONTEXT (decl);
9331 if (DECL_CONSTRUCTOR_P (decl))
9333 int ctor = copy_fn_p (decl);
9335 TYPE_HAS_CONSTRUCTOR (class_type) = 1;
9341 A non-template constructor for class X is a copy
9342 constructor if its first parameter is of type X&, const
9343 X&, volatile X& or const volatile X&, and either there
9344 are no other parameters or else all other parameters have
9345 default arguments. */
9346 TYPE_HAS_INIT_REF (class_type) = 1;
9348 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9350 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9351 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9353 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9357 A non-template assignment operator for class X is a copy
9358 assignment operator if its parameter is of type X, X&, const
9359 X&, volatile X& or const volatile X&. */
9361 int assop = copy_fn_p (decl);
9365 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9367 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9372 /* Check a constructor DECL has the correct form. Complains
9373 if the class has a constructor of the form X(X). */
9376 grok_ctor_properties (tree ctype, tree decl)
9378 int ctor_parm = copy_fn_p (decl);
9384 A declaration of a constructor for a class X is ill-formed if
9385 its first parameter is of type (optionally cv-qualified) X
9386 and either there are no other parameters or else all other
9387 parameters have default arguments.
9389 We *don't* complain about member template instantiations that
9390 have this form, though; they can occur as we try to decide
9391 what constructor to use during overload resolution. Since
9392 overload resolution will never prefer such a constructor to
9393 the non-template copy constructor (which is either explicitly
9394 or implicitly defined), there's no need to worry about their
9395 existence. Theoretically, they should never even be
9396 instantiated, but that's hard to forestall. */
9397 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9405 /* An operator with this code is unary, but can also be binary. */
9408 ambi_op_p (enum tree_code code)
9410 return (code == INDIRECT_REF
9411 || code == ADDR_EXPR
9412 || code == UNARY_PLUS_EXPR
9413 || code == NEGATE_EXPR
9414 || code == PREINCREMENT_EXPR
9415 || code == PREDECREMENT_EXPR);
9418 /* An operator with this name can only be unary. */
9421 unary_op_p (enum tree_code code)
9423 return (code == TRUTH_NOT_EXPR
9424 || code == BIT_NOT_EXPR
9425 || code == COMPONENT_REF
9426 || code == TYPE_EXPR);
9429 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9430 errors are issued for invalid declarations. */
9433 grok_op_properties (tree decl, bool complain)
9435 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9437 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9438 tree name = DECL_NAME (decl);
9439 enum tree_code operator_code;
9444 /* Count the number of arguments and check for ellipsis. */
9445 for (argtype = argtypes, arity = 0;
9446 argtype && argtype != void_list_node;
9447 argtype = TREE_CHAIN (argtype))
9449 ellipsis_p = !argtype;
9451 class_type = DECL_CONTEXT (decl);
9452 if (class_type && !CLASS_TYPE_P (class_type))
9453 class_type = NULL_TREE;
9455 if (DECL_CONV_FN_P (decl))
9456 operator_code = TYPE_EXPR;
9460 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9461 if (ansi_opname (CODE) == name) \
9463 operator_code = (CODE); \
9466 else if (ansi_assopname (CODE) == name) \
9468 operator_code = (CODE); \
9469 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9473 #include "operators.def"
9479 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9480 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9483 switch (operator_code)
9486 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9490 TYPE_GETS_DELETE (class_type) |= 1;
9494 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9497 case VEC_DELETE_EXPR:
9498 TYPE_GETS_DELETE (class_type) |= 2;
9505 /* [basic.std.dynamic.allocation]/1:
9507 A program is ill-formed if an allocation function is declared
9508 in a namespace scope other than global scope or declared static
9511 The same also holds true for deallocation functions. */
9512 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9513 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9515 if (DECL_NAMESPACE_SCOPE_P (decl))
9517 if (CP_DECL_CONTEXT (decl) != global_namespace)
9519 error ("%qD may not be declared within a namespace", decl);
9522 else if (!TREE_PUBLIC (decl))
9524 error ("%qD may not be declared as static", decl);
9530 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9531 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9532 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9533 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9536 /* An operator function must either be a non-static member function
9537 or have at least one parameter of a class, a reference to a class,
9538 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9539 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9541 if (operator_code == TYPE_EXPR
9542 || operator_code == CALL_EXPR
9543 || operator_code == COMPONENT_REF
9544 || operator_code == ARRAY_REF
9545 || operator_code == NOP_EXPR)
9547 error ("%qD must be a nonstatic member function", decl);
9554 if (DECL_STATIC_FUNCTION_P (decl))
9556 error ("%qD must be either a non-static member "
9557 "function or a non-member function", decl);
9561 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9563 tree arg = non_reference (TREE_VALUE (p));
9564 if (arg == error_mark_node)
9567 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9568 because these checks are performed even on
9569 template functions. */
9570 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9574 if (!p || p == void_list_node)
9577 error ("%qD must have an argument of class or "
9578 "enumerated type", decl);
9584 /* There are no restrictions on the arguments to an overloaded
9586 if (operator_code == CALL_EXPR)
9589 /* Warn about conversion operators that will never be used. */
9590 if (IDENTIFIER_TYPENAME_P (name)
9591 && ! DECL_TEMPLATE_INFO (decl)
9593 /* Warn only declaring the function; there is no need to
9594 warn again about out-of-class definitions. */
9595 && class_type == current_class_type)
9597 tree t = TREE_TYPE (name);
9598 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9599 const char *what = 0;
9602 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9604 if (TREE_CODE (t) == VOID_TYPE)
9606 else if (class_type)
9608 if (t == class_type)
9609 what = "the same type";
9610 /* Don't force t to be complete here. */
9611 else if (IS_AGGR_TYPE (t)
9612 && COMPLETE_TYPE_P (t)
9613 && DERIVED_FROM_P (t, class_type))
9614 what = "a base class";
9618 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9619 "conversion operator",
9620 ref ? "a reference to " : "", what);
9623 if (operator_code == COND_EXPR)
9626 error ("ISO C++ prohibits overloading operator ?:");
9629 else if (ellipsis_p)
9631 error ("%qD must not have variable number of arguments", decl);
9634 else if (ambi_op_p (operator_code))
9637 /* We pick the one-argument operator codes by default, so
9638 we don't have to change anything. */
9640 else if (arity == 2)
9642 /* If we thought this was a unary operator, we now know
9643 it to be a binary operator. */
9644 switch (operator_code)
9647 operator_code = MULT_EXPR;
9651 operator_code = BIT_AND_EXPR;
9654 case UNARY_PLUS_EXPR:
9655 operator_code = PLUS_EXPR;
9659 operator_code = MINUS_EXPR;
9662 case PREINCREMENT_EXPR:
9663 operator_code = POSTINCREMENT_EXPR;
9666 case PREDECREMENT_EXPR:
9667 operator_code = POSTDECREMENT_EXPR;
9674 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9676 if ((operator_code == POSTINCREMENT_EXPR
9677 || operator_code == POSTDECREMENT_EXPR)
9678 && ! processing_template_decl
9679 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9682 error ("postfix %qD must take %<int%> as its argument",
9685 error ("postfix %qD must take %<int%> as its second "
9693 error ("%qD must take either zero or one argument", decl);
9695 error ("%qD must take either one or two arguments", decl);
9699 /* More Effective C++ rule 6. */
9701 && (operator_code == POSTINCREMENT_EXPR
9702 || operator_code == POSTDECREMENT_EXPR
9703 || operator_code == PREINCREMENT_EXPR
9704 || operator_code == PREDECREMENT_EXPR))
9706 tree arg = TREE_VALUE (argtypes);
9707 tree ret = TREE_TYPE (TREE_TYPE (decl));
9708 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9709 arg = TREE_TYPE (arg);
9710 arg = TYPE_MAIN_VARIANT (arg);
9711 if (operator_code == PREINCREMENT_EXPR
9712 || operator_code == PREDECREMENT_EXPR)
9714 if (TREE_CODE (ret) != REFERENCE_TYPE
9715 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9717 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9718 build_reference_type (arg));
9722 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9723 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
9727 else if (unary_op_p (operator_code))
9732 error ("%qD must take %<void%>", decl);
9734 error ("%qD must take exactly one argument", decl);
9738 else /* if (binary_op_p (operator_code)) */
9743 error ("%qD must take exactly one argument", decl);
9745 error ("%qD must take exactly two arguments", decl);
9749 /* More Effective C++ rule 7. */
9751 && (operator_code == TRUTH_ANDIF_EXPR
9752 || operator_code == TRUTH_ORIF_EXPR
9753 || operator_code == COMPOUND_EXPR))
9754 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
9758 /* Effective C++ rule 23. */
9761 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9762 && (operator_code == PLUS_EXPR
9763 || operator_code == MINUS_EXPR
9764 || operator_code == TRUNC_DIV_EXPR
9765 || operator_code == MULT_EXPR
9766 || operator_code == TRUNC_MOD_EXPR)
9767 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9768 warning (OPT_Weffc__, "%qD should return by value", decl);
9771 for (; argtypes && argtypes != void_list_node;
9772 argtypes = TREE_CHAIN (argtypes))
9773 if (TREE_PURPOSE (argtypes))
9775 TREE_PURPOSE (argtypes) = NULL_TREE;
9776 if (operator_code == POSTINCREMENT_EXPR
9777 || operator_code == POSTDECREMENT_EXPR)
9780 pedwarn ("%qD cannot have default arguments", decl);
9784 error ("%qD cannot have default arguments", decl);
9792 /* Return a string giving the keyword associate with CODE. */
9795 tag_name (enum tag_types code)
9814 /* Name lookup in an elaborated-type-specifier (after the keyword
9815 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9816 elaborated-type-specifier is invalid, issue a diagnostic and return
9817 error_mark_node; otherwise, return the *_TYPE to which it referred.
9818 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9821 check_elaborated_type_specifier (enum tag_types tag_code,
9823 bool allow_template_p)
9829 struct S { struct S *p; };
9831 name lookup will find the TYPE_DECL for the implicit "S::S"
9832 typedef. Adjust for that here. */
9833 if (DECL_SELF_REFERENCE_P (decl))
9834 decl = TYPE_NAME (TREE_TYPE (decl));
9836 type = TREE_TYPE (decl);
9838 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9839 is false for this case as well. */
9840 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9842 error ("using template type parameter %qT after %qs",
9843 type, tag_name (tag_code));
9844 return error_mark_node;
9848 If the identifier resolves to a typedef-name or a template
9849 type-parameter, the elaborated-type-specifier is ill-formed.
9851 In other words, the only legitimate declaration to use in the
9852 elaborated type specifier is the implicit typedef created when
9853 the type is declared. */
9854 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9855 && tag_code != typename_type)
9857 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9858 error ("%q+D has a previous declaration here", decl);
9859 return error_mark_node;
9861 else if (TREE_CODE (type) != RECORD_TYPE
9862 && TREE_CODE (type) != UNION_TYPE
9863 && tag_code != enum_type
9864 && tag_code != typename_type)
9866 error ("%qT referred to as %qs", type, tag_name (tag_code));
9867 error ("%q+T has a previous declaration here", type);
9868 return error_mark_node;
9870 else if (TREE_CODE (type) != ENUMERAL_TYPE
9871 && tag_code == enum_type)
9873 error ("%qT referred to as enum", type);
9874 error ("%q+T has a previous declaration here", type);
9875 return error_mark_node;
9877 else if (!allow_template_p
9878 && TREE_CODE (type) == RECORD_TYPE
9879 && CLASSTYPE_IS_TEMPLATE (type))
9881 /* If a class template appears as elaborated type specifier
9882 without a template header such as:
9884 template <class T> class C {};
9885 void f(class C); // No template header here
9887 then the required template argument is missing. */
9888 error ("template argument required for %<%s %T%>",
9889 tag_name (tag_code),
9890 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9891 return error_mark_node;
9897 /* Lookup NAME in elaborate type specifier in scope according to
9898 SCOPE and issue diagnostics if necessary.
9899 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9900 found, and ERROR_MARK_NODE for type error. */
9903 lookup_and_check_tag (enum tag_types tag_code, tree name,
9904 tag_scope scope, bool template_header_p)
9908 if (scope == ts_global)
9910 /* First try ordinary name lookup, ignoring hidden class name
9911 injected via friend declaration. */
9912 decl = lookup_name_prefer_type (name, 2);
9913 /* If that fails, the name will be placed in the smallest
9914 non-class, non-function-prototype scope according to 3.3.1/5.
9915 We may already have a hidden name declared as friend in this
9916 scope. So lookup again but not ignoring hidden names.
9917 If we find one, that name will be made visible rather than
9918 creating a new tag. */
9920 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9923 decl = lookup_type_scope (name, scope);
9925 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9926 decl = DECL_TEMPLATE_RESULT (decl);
9928 if (decl && TREE_CODE (decl) == TYPE_DECL)
9930 /* Look for invalid nested type:
9934 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9936 error ("%qD has the same name as the class in which it is "
9939 return error_mark_node;
9942 /* Two cases we need to consider when deciding if a class
9943 template is allowed as an elaborated type specifier:
9944 1. It is a self reference to its own class.
9945 2. It comes with a template header.
9949 template <class T> class C {
9950 class C *c1; // DECL_SELF_REFERENCE_P is true
9953 template <class U> class C; // template_header_p is true
9954 template <class T> class C<T>::D {
9955 class C *c2; // DECL_SELF_REFERENCE_P is true
9958 t = check_elaborated_type_specifier (tag_code,
9961 | DECL_SELF_REFERENCE_P (decl));
9964 else if (decl && TREE_CODE (decl) == TREE_LIST)
9966 error ("reference to %qD is ambiguous", name);
9967 print_candidates (decl);
9968 return error_mark_node;
9974 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9975 Define the tag as a forward-reference if it is not defined.
9977 If a declaration is given, process it here, and report an error if
9978 multiple declarations are not identical.
9980 SCOPE is TS_CURRENT when this is also a definition. Only look in
9981 the current frame for the name (since C++ allows new names in any
9982 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9983 declaration. Only look beginning from the current scope outward up
9984 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9986 TEMPLATE_HEADER_P is true when this declaration is preceded by
9987 a set of template parameters. */
9990 xref_tag (enum tag_types tag_code, tree name,
9991 tag_scope scope, bool template_header_p)
9993 enum tree_code code;
9995 tree context = NULL_TREE;
9997 timevar_push (TV_NAME_LOOKUP);
9999 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10005 code = RECORD_TYPE;
10011 code = ENUMERAL_TYPE;
10014 gcc_unreachable ();
10017 /* In case of anonymous name, xref_tag is only called to
10018 make type node and push name. Name lookup is not required. */
10019 if (ANON_AGGRNAME_P (name))
10022 t = lookup_and_check_tag (tag_code, name,
10023 scope, template_header_p);
10025 if (t == error_mark_node)
10026 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10028 if (scope != ts_current && t && current_class_type
10029 && template_class_depth (current_class_type)
10030 && template_header_p)
10032 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10033 definition of this tag. Since, in addition, we are currently
10034 processing a (member) template declaration of a template
10035 class, we must be very careful; consider:
10042 { template <class V>
10043 friend struct S1; };
10045 Here, the S2::S1 declaration should not be confused with the
10046 outer declaration. In particular, the inner version should
10047 have a template parameter of level 2, not level 1. This
10048 would be particularly important if the member declaration
10051 template <class V = U> friend struct S1;
10053 say, when we should tsubst into `U' when instantiating
10054 S2. On the other hand, when presented with:
10064 we must find the inner binding eventually. We
10065 accomplish this by making sure that the new type we
10066 create to represent this declaration has the right
10068 context = TYPE_CONTEXT (t);
10074 /* If no such tag is yet defined, create a forward-reference node
10075 and record it as the "definition".
10076 When a real declaration of this type is found,
10077 the forward-reference will be altered into a real type. */
10078 if (code == ENUMERAL_TYPE)
10080 error ("use of enum %q#D without previous declaration", name);
10081 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10085 t = make_aggr_type (code);
10086 TYPE_CONTEXT (t) = context;
10087 t = pushtag (name, t, scope);
10092 if (template_header_p && IS_AGGR_TYPE (t))
10094 if (!redeclare_class_template (t, current_template_parms))
10095 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10097 else if (!processing_template_decl
10098 && CLASS_TYPE_P (t)
10099 && CLASSTYPE_IS_TEMPLATE (t))
10101 error ("redeclaration of %qT as a non-template", t);
10102 error ("previous declaration %q+D", t);
10103 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10106 /* Make injected friend class visible. */
10107 if (scope != ts_within_enclosing_non_class
10108 && hidden_name_p (TYPE_NAME (t)))
10110 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10111 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10113 if (TYPE_TEMPLATE_INFO (t))
10115 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10116 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10121 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10125 xref_tag_from_type (tree old, tree id, tag_scope scope)
10127 enum tag_types tag_kind;
10129 if (TREE_CODE (old) == RECORD_TYPE)
10130 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10132 tag_kind = union_type;
10134 if (id == NULL_TREE)
10135 id = TYPE_IDENTIFIER (old);
10137 return xref_tag (tag_kind, id, scope, false);
10140 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10141 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10142 access_* node, and the TREE_VALUE is the type of the base-class.
10143 Non-NULL TREE_TYPE indicates virtual inheritance.
10145 Returns true if the binfo hierarchy was successfully created,
10146 false if an error was detected. */
10149 xref_basetypes (tree ref, tree base_list)
10152 tree binfo, base_binfo;
10153 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10154 unsigned max_bases = 0; /* Maximum direct bases. */
10156 tree default_access;
10157 tree igo_prev; /* Track Inheritance Graph Order. */
10159 if (ref == error_mark_node)
10162 /* The base of a derived class is private by default, all others are
10164 default_access = (TREE_CODE (ref) == RECORD_TYPE
10165 && CLASSTYPE_DECLARED_CLASS (ref)
10166 ? access_private_node : access_public_node);
10168 /* First, make sure that any templates in base-classes are
10169 instantiated. This ensures that if we call ourselves recursively
10170 we do not get confused about which classes are marked and which
10172 basep = &base_list;
10175 tree basetype = TREE_VALUE (*basep);
10177 if (!(processing_template_decl && uses_template_parms (basetype))
10178 && !complete_type_or_else (basetype, NULL))
10179 /* An incomplete type. Remove it from the list. */
10180 *basep = TREE_CHAIN (*basep);
10184 if (TREE_TYPE (*basep))
10186 if (CLASS_TYPE_P (basetype))
10187 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10188 basep = &TREE_CHAIN (*basep);
10192 TYPE_MARKED_P (ref) = 1;
10194 /* The binfo slot should be empty, unless this is an (ill-formed)
10196 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10197 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10199 binfo = make_tree_binfo (max_bases);
10201 TYPE_BINFO (ref) = binfo;
10202 BINFO_OFFSET (binfo) = size_zero_node;
10203 BINFO_TYPE (binfo) = ref;
10207 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10208 /* An aggregate cannot have baseclasses. */
10209 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10211 if (TREE_CODE (ref) == UNION_TYPE)
10213 error ("derived union %qT invalid", ref);
10220 if (TYPE_FOR_JAVA (ref))
10222 error ("Java class %qT cannot have multiple bases", ref);
10229 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10231 if (TYPE_FOR_JAVA (ref))
10233 error ("Java class %qT cannot have virtual bases", ref);
10238 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10240 tree access = TREE_PURPOSE (base_list);
10241 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10242 tree basetype = TREE_VALUE (base_list);
10244 if (access == access_default_node)
10245 access = default_access;
10247 if (PACK_EXPANSION_P (basetype))
10248 basetype = PACK_EXPANSION_PATTERN (basetype);
10249 if (TREE_CODE (basetype) == TYPE_DECL)
10250 basetype = TREE_TYPE (basetype);
10251 if (TREE_CODE (basetype) != RECORD_TYPE
10252 && TREE_CODE (basetype) != TYPENAME_TYPE
10253 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10254 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10256 error ("base type %qT fails to be a struct or class type",
10261 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10262 TYPE_FOR_JAVA (ref) = 1;
10264 base_binfo = NULL_TREE;
10265 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10267 base_binfo = TYPE_BINFO (basetype);
10268 /* The original basetype could have been a typedef'd type. */
10269 basetype = BINFO_TYPE (base_binfo);
10271 /* Inherit flags from the base. */
10272 TYPE_HAS_NEW_OPERATOR (ref)
10273 |= TYPE_HAS_NEW_OPERATOR (basetype);
10274 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10275 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10276 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10277 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10278 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10279 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10280 CLASSTYPE_REPEATED_BASE_P (ref)
10281 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10284 /* We must do this test after we've seen through a typedef
10286 if (TYPE_MARKED_P (basetype))
10288 if (basetype == ref)
10289 error ("recursive type %qT undefined", basetype);
10291 error ("duplicate base type %qT invalid", basetype);
10295 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10296 /* Regenerate the pack expansion for the bases. */
10297 basetype = make_pack_expansion (basetype);
10299 TYPE_MARKED_P (basetype) = 1;
10301 base_binfo = copy_binfo (base_binfo, basetype, ref,
10302 &igo_prev, via_virtual);
10303 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10304 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10306 BINFO_BASE_APPEND (binfo, base_binfo);
10307 BINFO_BASE_ACCESS_APPEND (binfo, access);
10310 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10311 /* If we have space in the vbase vector, we must have shared at
10312 least one of them, and are therefore diamond shaped. */
10313 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10315 /* Unmark all the types. */
10316 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10317 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10318 TYPE_MARKED_P (ref) = 0;
10320 /* Now see if we have a repeated base type. */
10321 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10323 for (base_binfo = binfo; base_binfo;
10324 base_binfo = TREE_CHAIN (base_binfo))
10326 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10328 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10331 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10333 for (base_binfo = binfo; base_binfo;
10334 base_binfo = TREE_CHAIN (base_binfo))
10335 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10336 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10345 /* Begin compiling the definition of an enumeration type.
10347 Returns the type object, as yet incomplete.
10348 Also records info about it so that build_enumerator
10349 may be used to declare the individual values as they are read. */
10352 start_enum (tree name)
10356 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10358 /* If this is the real definition for a previous forward reference,
10359 fill in the contents in the same object that used to be the
10360 forward reference. */
10362 enumtype = lookup_and_check_tag (enum_type, name,
10363 /*tag_scope=*/ts_current,
10364 /*template_header_p=*/false);
10366 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10368 error ("multiple definition of %q#T", enumtype);
10369 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10370 /* Clear out TYPE_VALUES, and start again. */
10371 TYPE_VALUES (enumtype) = NULL_TREE;
10375 /* In case of error, make a dummy enum to allow parsing to
10377 if (enumtype == error_mark_node)
10378 name = make_anon_name ();
10380 enumtype = make_node (ENUMERAL_TYPE);
10381 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10387 /* After processing and defining all the values of an enumeration type,
10388 install their decls in the enumeration type and finish it off.
10389 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10392 finish_enum (tree enumtype)
10401 bool use_short_enum;
10405 integer_type_kind itk;
10406 tree underlying_type = NULL_TREE;
10408 /* We built up the VALUES in reverse order. */
10409 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10411 /* For an enum defined in a template, just set the type of the values;
10412 all further processing is postponed until the template is
10413 instantiated. We need to set the type so that tsubst of a CONST_DECL
10415 if (processing_template_decl)
10417 for (values = TYPE_VALUES (enumtype);
10419 values = TREE_CHAIN (values))
10420 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10421 if (at_function_scope_p ())
10422 add_stmt (build_min (TAG_DEFN, enumtype));
10426 /* Determine the minimum and maximum values of the enumerators. */
10427 if (TYPE_VALUES (enumtype))
10429 minnode = maxnode = NULL_TREE;
10431 for (values = TYPE_VALUES (enumtype);
10433 values = TREE_CHAIN (values))
10435 decl = TREE_VALUE (values);
10437 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10438 each enumerator has the type of its enumeration. Prior to the
10439 closing brace, the type of each enumerator is the type of its
10440 initializing value. */
10441 TREE_TYPE (decl) = enumtype;
10443 /* Update the minimum and maximum values, if appropriate. */
10444 value = DECL_INITIAL (decl);
10445 if (value == error_mark_node)
10446 value = integer_zero_node;
10447 /* Figure out what the minimum and maximum values of the
10448 enumerators are. */
10450 minnode = maxnode = value;
10451 else if (tree_int_cst_lt (maxnode, value))
10453 else if (tree_int_cst_lt (value, minnode))
10460 If the enumerator-list is empty, the underlying type is as if
10461 the enumeration had a single enumerator with value 0. */
10462 minnode = maxnode = integer_zero_node;
10464 /* Compute the number of bits require to represent all values of the
10465 enumeration. We must do this before the type of MINNODE and
10466 MAXNODE are transformed, since min_precision relies on the
10467 TREE_TYPE of the value it is passed. */
10468 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10469 lowprec = min_precision (minnode, unsignedp);
10470 highprec = min_precision (maxnode, unsignedp);
10471 precision = MAX (lowprec, highprec);
10473 /* Determine the underlying type of the enumeration.
10477 The underlying type of an enumeration is an integral type that
10478 can represent all the enumerator values defined in the
10479 enumeration. It is implementation-defined which integral type is
10480 used as the underlying type for an enumeration except that the
10481 underlying type shall not be larger than int unless the value of
10482 an enumerator cannot fit in an int or unsigned int.
10484 We use "int" or an "unsigned int" as the underlying type, even if
10485 a smaller integral type would work, unless the user has
10486 explicitly requested that we use the smallest possible type. The
10487 user can request that for all enumerations with a command line
10488 flag, or for just one enumeration with an attribute. */
10490 use_short_enum = flag_short_enums
10491 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10493 for (itk = (use_short_enum ? itk_char : itk_int);
10497 underlying_type = integer_types[itk];
10498 if (TYPE_PRECISION (underlying_type) >= precision
10499 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10502 if (itk == itk_none)
10506 IF no integral type can represent all the enumerator values, the
10507 enumeration is ill-formed. */
10508 error ("no integral type can represent all of the enumerator values "
10509 "for %qT", enumtype);
10510 precision = TYPE_PRECISION (long_long_integer_type_node);
10511 underlying_type = integer_types[itk_unsigned_long_long];
10514 /* Compute the minium and maximum values for the type.
10518 For an enumeration where emin is the smallest enumerator and emax
10519 is the largest, the values of the enumeration are the values of the
10520 underlying type in the range bmin to bmax, where bmin and bmax are,
10521 respectively, the smallest and largest values of the smallest bit-
10522 field that can store emin and emax. */
10524 /* The middle-end currently assumes that types with TYPE_PRECISION
10525 narrower than their underlying type are suitably zero or sign
10526 extended to fill their mode. g++ doesn't make these guarantees.
10527 Until the middle-end can represent such paradoxical types, we
10528 set the TYPE_PRECISION to the width of the underlying type. */
10529 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10531 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10535 The value of sizeof() applied to an enumeration type, an object
10536 of an enumeration type, or an enumerator, is the value of sizeof()
10537 applied to the underlying type. */
10538 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10539 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10540 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10541 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10542 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10543 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10545 /* Convert each of the enumerators to the type of the underlying
10546 type of the enumeration. */
10547 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10549 location_t saved_location;
10551 decl = TREE_VALUE (values);
10552 saved_location = input_location;
10553 input_location = DECL_SOURCE_LOCATION (decl);
10554 value = perform_implicit_conversion (underlying_type,
10555 DECL_INITIAL (decl));
10556 input_location = saved_location;
10558 /* Do not clobber shared ints. */
10559 value = copy_node (value);
10561 TREE_TYPE (value) = enumtype;
10562 DECL_INITIAL (decl) = value;
10563 TREE_VALUE (values) = value;
10566 /* Fix up all variant types of this enum type. */
10567 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10569 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10570 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10571 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10572 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10573 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10574 TYPE_MODE (t) = TYPE_MODE (enumtype);
10575 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10576 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10577 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10578 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10581 /* Finish debugging output for this type. */
10582 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10585 /* Build and install a CONST_DECL for an enumeration constant of the
10586 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10587 Assignment of sequential values by default is handled here. */
10590 build_enumerator (tree name, tree value, tree enumtype)
10596 /* If the VALUE was erroneous, pretend it wasn't there; that will
10597 result in the enum being assigned the next value in sequence. */
10598 if (value == error_mark_node)
10601 /* Remove no-op casts from the value. */
10603 STRIP_TYPE_NOPS (value);
10605 if (! processing_template_decl)
10607 /* Validate and default VALUE. */
10608 if (value != NULL_TREE)
10610 value = integral_constant_value (value);
10612 if (TREE_CODE (value) == INTEGER_CST)
10614 value = perform_integral_promotions (value);
10615 constant_expression_warning (value);
10619 error ("enumerator value for %qD is not an integer constant", name);
10624 /* Default based on previous value. */
10625 if (value == NULL_TREE)
10627 if (TYPE_VALUES (enumtype))
10630 unsigned HOST_WIDE_INT lo;
10634 /* The next value is the previous value plus one. We can
10635 safely assume that the previous value is an INTEGER_CST.
10636 add_double doesn't know the type of the target expression,
10637 so we must check with int_fits_type_p as well. */
10638 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10639 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10640 TREE_INT_CST_HIGH (prev_value),
10642 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10643 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10647 error ("overflow in enumeration values at %qD", name);
10648 value = error_mark_node;
10652 value = integer_zero_node;
10655 /* Remove no-op casts from the value. */
10656 STRIP_TYPE_NOPS (value);
10659 /* C++ associates enums with global, function, or class declarations. */
10660 context = current_scope ();
10662 /* Build the actual enumeration constant. Note that the enumeration
10663 constants have the type of their initializers until the
10664 enumeration is complete:
10668 Following the closing brace of an enum-specifier, each enumer-
10669 ator has the type of its enumeration. Prior to the closing
10670 brace, the type of each enumerator is the type of its
10671 initializing value.
10673 In finish_enum we will reset the type. Of course, if we're
10674 processing a template, there may be no value. */
10675 type = value ? TREE_TYPE (value) : NULL_TREE;
10677 if (context && context == current_class_type)
10678 /* This enum declaration is local to the class. We need the full
10679 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10680 decl = build_lang_decl (CONST_DECL, name, type);
10682 /* It's a global enum, or it's local to a function. (Note local to
10683 a function could mean local to a class method. */
10684 decl = build_decl (CONST_DECL, name, type);
10686 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10687 TREE_CONSTANT (decl) = 1;
10688 TREE_INVARIANT (decl) = 1;
10689 TREE_READONLY (decl) = 1;
10690 DECL_INITIAL (decl) = value;
10692 if (context && context == current_class_type)
10693 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10694 on the TYPE_FIELDS list for `S'. (That's so that you can say
10695 things like `S::i' later.) */
10696 finish_member_declaration (decl);
10700 /* Add this enumeration constant to the list for this type. */
10701 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10705 /* We're defining DECL. Make sure that it's type is OK. */
10708 check_function_type (tree decl, tree current_function_parms)
10710 tree fntype = TREE_TYPE (decl);
10711 tree return_type = complete_type (TREE_TYPE (fntype));
10713 /* In a function definition, arg types must be complete. */
10714 require_complete_types_for_parms (current_function_parms);
10716 if (dependent_type_p (return_type))
10718 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10720 tree args = TYPE_ARG_TYPES (fntype);
10722 error ("return type %q#T is incomplete", return_type);
10724 /* Make it return void instead. */
10725 if (TREE_CODE (fntype) == METHOD_TYPE)
10726 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10728 TREE_CHAIN (args));
10730 fntype = build_function_type (void_type_node, args);
10732 = build_exception_variant (fntype,
10733 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10736 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10739 /* Create the FUNCTION_DECL for a function definition.
10740 DECLSPECS and DECLARATOR are the parts of the declaration;
10741 they describe the function's name and the type it returns,
10742 but twisted together in a fashion that parallels the syntax of C.
10744 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10745 DECLARATOR is really the DECL for the function we are about to
10746 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10747 indicating that the function is an inline defined in-class.
10749 This function creates a binding context for the function body
10750 as well as setting up the FUNCTION_DECL in current_function_decl.
10752 For C++, we must first check whether that datum makes any sense.
10753 For example, "class A local_a(1,2);" means that variable local_a
10754 is an aggregate of type A, which should have a constructor
10755 applied to it with the argument list [1, 2].
10757 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
10758 or may be a BLOCK if the function has been defined previously
10759 in this translation unit. On exit, DECL_INITIAL (decl1) will be
10760 error_mark_node if the function has never been defined, or
10761 a BLOCK if the function has been defined somewhere. */
10764 start_preparsed_function (tree decl1, tree attrs, int flags)
10766 tree ctype = NULL_TREE;
10769 int doing_friend = 0;
10770 struct cp_binding_level *bl;
10771 tree current_function_parms;
10772 struct c_fileinfo *finfo
10773 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
10774 bool honor_interface;
10776 /* Sanity check. */
10777 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10778 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10780 fntype = TREE_TYPE (decl1);
10781 if (TREE_CODE (fntype) == METHOD_TYPE)
10782 ctype = TYPE_METHOD_BASETYPE (fntype);
10784 /* ISO C++ 11.4/5. A friend function defined in a class is in
10785 the (lexical) scope of the class in which it is defined. */
10786 if (!ctype && DECL_FRIEND_P (decl1))
10788 ctype = DECL_FRIEND_CONTEXT (decl1);
10790 /* CTYPE could be null here if we're dealing with a template;
10791 for example, `inline friend float foo()' inside a template
10792 will have no CTYPE set. */
10793 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10799 if (DECL_DECLARED_INLINE_P (decl1)
10800 && lookup_attribute ("noinline", attrs))
10801 warning (0, "inline function %q+D given attribute noinline", decl1);
10803 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10804 /* This is a constructor, we must ensure that any default args
10805 introduced by this definition are propagated to the clones
10806 now. The clones are used directly in overload resolution. */
10807 adjust_clone_args (decl1);
10809 /* Sometimes we don't notice that a function is a static member, and
10810 build a METHOD_TYPE for it. Fix that up now. */
10811 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10812 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10814 revert_static_member_fn (decl1);
10818 /* Set up current_class_type, and enter the scope of the class, if
10821 push_nested_class (ctype);
10822 else if (DECL_STATIC_FUNCTION_P (decl1))
10823 push_nested_class (DECL_CONTEXT (decl1));
10825 /* Now that we have entered the scope of the class, we must restore
10826 the bindings for any template parameters surrounding DECL1, if it
10827 is an inline member template. (Order is important; consider the
10828 case where a template parameter has the same name as a field of
10829 the class.) It is not until after this point that
10830 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10831 if (flags & SF_INCLASS_INLINE)
10832 maybe_begin_member_template_processing (decl1);
10834 /* Effective C++ rule 15. */
10836 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10837 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10838 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
10840 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10841 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10842 if (!DECL_INITIAL (decl1))
10843 DECL_INITIAL (decl1) = error_mark_node;
10845 /* This function exists in static storage.
10846 (This does not mean `static' in the C sense!) */
10847 TREE_STATIC (decl1) = 1;
10849 /* We must call push_template_decl after current_class_type is set
10850 up. (If we are processing inline definitions after exiting a
10851 class scope, current_class_type will be NULL_TREE until set above
10852 by push_nested_class.) */
10853 if (processing_template_decl)
10855 /* FIXME: Handle error_mark_node more gracefully. */
10856 tree newdecl1 = push_template_decl (decl1);
10857 if (newdecl1 != error_mark_node)
10861 /* We are now in the scope of the function being defined. */
10862 current_function_decl = decl1;
10864 /* Save the parm names or decls from this function's declarator
10865 where store_parm_decls will find them. */
10866 current_function_parms = DECL_ARGUMENTS (decl1);
10868 /* Make sure the parameter and return types are reasonable. When
10869 you declare a function, these types can be incomplete, but they
10870 must be complete when you define the function. */
10871 check_function_type (decl1, current_function_parms);
10873 /* Build the return declaration for the function. */
10874 restype = TREE_TYPE (fntype);
10875 if (DECL_RESULT (decl1) == NULL_TREE)
10879 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10880 DECL_ARTIFICIAL (resdecl) = 1;
10881 DECL_IGNORED_P (resdecl) = 1;
10882 DECL_RESULT (decl1) = resdecl;
10884 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10887 /* Let the user know we're compiling this function. */
10888 announce_function (decl1);
10890 /* Record the decl so that the function name is defined.
10891 If we already have a decl for this name, and it is a FUNCTION_DECL,
10892 use the old decl. */
10893 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10895 /* A specialization is not used to guide overload resolution. */
10896 if (!DECL_FUNCTION_MEMBER_P (decl1)
10897 && !(DECL_USE_TEMPLATE (decl1) &&
10898 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10900 tree olddecl = pushdecl (decl1);
10902 if (olddecl == error_mark_node)
10903 /* If something went wrong when registering the declaration,
10904 use DECL1; we have to have a FUNCTION_DECL to use when
10905 parsing the body of the function. */
10909 /* Otherwise, OLDDECL is either a previous declaration
10910 of the same function or DECL1 itself. */
10912 if (warn_missing_declarations
10913 && olddecl == decl1
10914 && !DECL_MAIN_P (decl1)
10915 && TREE_PUBLIC (decl1)
10916 && !DECL_DECLARED_INLINE_P (decl1))
10920 /* Check whether DECL1 is in an anonymous
10922 for (context = DECL_CONTEXT (decl1);
10924 context = DECL_CONTEXT (context))
10926 if (TREE_CODE (context) == NAMESPACE_DECL
10927 && DECL_NAME (context) == NULL_TREE)
10931 if (context == NULL)
10932 warning (OPT_Wmissing_declarations,
10933 "no previous declaration for %q+D", decl1);
10941 /* We need to set the DECL_CONTEXT. */
10942 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10943 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10945 fntype = TREE_TYPE (decl1);
10947 /* If #pragma weak applies, mark the decl appropriately now.
10948 The pragma only applies to global functions. Because
10949 determining whether or not the #pragma applies involves
10950 computing the mangled name for the declaration, we cannot
10951 apply the pragma until after we have merged this declaration
10952 with any previous declarations; if the original declaration
10953 has a linkage specification, that specification applies to
10954 the definition as well, and may affect the mangled name. */
10955 if (!DECL_CONTEXT (decl1))
10956 maybe_apply_pragma_weak (decl1);
10959 /* Reset this in case the call to pushdecl changed it. */
10960 current_function_decl = decl1;
10962 gcc_assert (DECL_INITIAL (decl1));
10964 /* This function may already have been parsed, in which case just
10965 return; our caller will skip over the body without parsing. */
10966 if (DECL_INITIAL (decl1) != error_mark_node)
10969 /* Initialize RTL machinery. We cannot do this until
10970 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10971 even when processing a template; this is how we get
10972 CFUN set up, and our per-function variables initialized.
10973 FIXME factor out the non-RTL stuff. */
10974 bl = current_binding_level;
10975 allocate_struct_function (decl1);
10976 current_binding_level = bl;
10978 /* Even though we're inside a function body, we still don't want to
10979 call expand_expr to calculate the size of a variable-sized array.
10980 We haven't necessarily assigned RTL to all variables yet, so it's
10981 not safe to try to expand expressions involving them. */
10982 cfun->x_dont_save_pending_sizes_p = 1;
10984 /* Start the statement-tree, start the tree now. */
10985 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10987 /* If we are (erroneously) defining a function that we have already
10988 defined before, wipe out what we knew before. */
10989 if (!DECL_PENDING_INLINE_P (decl1))
10990 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10992 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10994 /* We know that this was set up by `grokclassfn'. We do not
10995 wait until `store_parm_decls', since evil parse errors may
10996 never get us to that point. Here we keep the consistency
10997 between `current_class_type' and `current_class_ptr'. */
10998 tree t = DECL_ARGUMENTS (decl1);
11000 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11001 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11003 cp_function_chain->x_current_class_ref
11004 = build_indirect_ref (t, NULL);
11005 cp_function_chain->x_current_class_ptr = t;
11007 /* Constructors and destructors need to know whether they're "in
11008 charge" of initializing virtual base classes. */
11009 t = TREE_CHAIN (t);
11010 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11012 current_in_charge_parm = t;
11013 t = TREE_CHAIN (t);
11015 if (DECL_HAS_VTT_PARM_P (decl1))
11017 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11018 current_vtt_parm = t;
11022 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11023 /* Implicitly-defined methods (like the
11024 destructor for a class in which no destructor
11025 is explicitly declared) must not be defined
11026 until their definition is needed. So, we
11027 ignore interface specifications for
11028 compiler-generated functions. */
11029 && !DECL_ARTIFICIAL (decl1));
11031 if (DECL_INTERFACE_KNOWN (decl1))
11033 tree ctx = decl_function_context (decl1);
11035 if (DECL_NOT_REALLY_EXTERN (decl1))
11036 DECL_EXTERNAL (decl1) = 0;
11038 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11039 && TREE_PUBLIC (ctx))
11040 /* This is a function in a local class in an extern inline
11042 comdat_linkage (decl1);
11044 /* If this function belongs to an interface, it is public.
11045 If it belongs to someone else's interface, it is also external.
11046 This only affects inlines and template instantiations. */
11047 else if (!finfo->interface_unknown && honor_interface)
11049 if (DECL_DECLARED_INLINE_P (decl1)
11050 || DECL_TEMPLATE_INSTANTIATION (decl1)
11051 || processing_template_decl)
11053 DECL_EXTERNAL (decl1)
11054 = (finfo->interface_only
11055 || (DECL_DECLARED_INLINE_P (decl1)
11056 && ! flag_implement_inlines
11057 && !DECL_VINDEX (decl1)));
11059 /* For WIN32 we also want to put these in linkonce sections. */
11060 maybe_make_one_only (decl1);
11063 DECL_EXTERNAL (decl1) = 0;
11064 DECL_INTERFACE_KNOWN (decl1) = 1;
11065 /* If this function is in an interface implemented in this file,
11066 make sure that the back end knows to emit this function
11068 if (!DECL_EXTERNAL (decl1))
11069 mark_needed (decl1);
11071 else if (finfo->interface_unknown && finfo->interface_only
11072 && honor_interface)
11074 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11075 interface, we will have both finfo->interface_unknown and
11076 finfo->interface_only set. In that case, we don't want to
11077 use the normal heuristics because someone will supply a
11078 #pragma implementation elsewhere, and deducing it here would
11079 produce a conflict. */
11080 comdat_linkage (decl1);
11081 DECL_EXTERNAL (decl1) = 0;
11082 DECL_INTERFACE_KNOWN (decl1) = 1;
11083 DECL_DEFER_OUTPUT (decl1) = 1;
11087 /* This is a definition, not a reference.
11088 So clear DECL_EXTERNAL. */
11089 DECL_EXTERNAL (decl1) = 0;
11091 if ((DECL_DECLARED_INLINE_P (decl1)
11092 || DECL_TEMPLATE_INSTANTIATION (decl1))
11093 && ! DECL_INTERFACE_KNOWN (decl1)
11094 /* Don't try to defer nested functions for now. */
11095 && ! decl_function_context (decl1))
11096 DECL_DEFER_OUTPUT (decl1) = 1;
11098 DECL_INTERFACE_KNOWN (decl1) = 1;
11101 /* Determine the ELF visibility attribute for the function. We must not
11102 do this before calling "pushdecl", as we must allow "duplicate_decls"
11103 to merge any attributes appropriately. We also need to wait until
11105 if (!DECL_CLONED_FUNCTION_P (decl1))
11106 determine_visibility (decl1);
11108 begin_scope (sk_function_parms, decl1);
11112 if (DECL_DESTRUCTOR_P (decl1)
11113 || (DECL_CONSTRUCTOR_P (decl1)
11114 && targetm.cxx.cdtor_returns_this ()))
11116 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11117 DECL_CONTEXT (cdtor_label) = current_function_decl;
11120 start_fname_decls ();
11122 store_parm_decls (current_function_parms);
11126 /* Like start_preparsed_function, except that instead of a
11127 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11129 Returns 1 on success. If the DECLARATOR is not suitable for a function
11130 (it defines a datum instead), we return 0, which tells
11131 yyparse to report a parse error. */
11134 start_function (cp_decl_specifier_seq *declspecs,
11135 const cp_declarator *declarator,
11140 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11141 /* If the declarator is not suitable for a function definition,
11142 cause a syntax error. */
11143 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11146 if (DECL_MAIN_P (decl1))
11147 /* main must return int. grokfndecl should have corrected it
11148 (and issued a diagnostic) if the user got it wrong. */
11149 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11150 integer_type_node));
11152 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11157 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11161 use_eh_spec_block (tree fn)
11163 return (flag_exceptions && flag_enforce_eh_specs
11164 && !processing_template_decl
11165 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11166 /* We insert the EH_SPEC_BLOCK only in the original
11167 function; then, it is copied automatically to the
11169 && !DECL_CLONED_FUNCTION_P (fn)
11170 /* Implicitly-generated constructors and destructors have
11171 exception specifications. However, those specifications
11172 are the union of the possible exceptions specified by the
11173 constructors/destructors for bases and members, so no
11174 unallowed exception will ever reach this function. By
11175 not creating the EH_SPEC_BLOCK we save a little memory,
11176 and we avoid spurious warnings about unreachable
11178 && !DECL_ARTIFICIAL (fn));
11181 /* Store the parameter declarations into the current function declaration.
11182 This is called after parsing the parameter declarations, before
11183 digesting the body of the function.
11185 Also install to binding contour return value identifier, if any. */
11188 store_parm_decls (tree current_function_parms)
11190 tree fndecl = current_function_decl;
11193 /* This is a chain of any other decls that came in among the parm
11194 declarations. If a parm is declared with enum {foo, bar} x;
11195 then CONST_DECLs for foo and bar are put here. */
11196 tree nonparms = NULL_TREE;
11198 if (current_function_parms)
11200 /* This case is when the function was defined with an ANSI prototype.
11201 The parms already have decls, so we need not do anything here
11202 except record them as in effect
11203 and complain if any redundant old-style parm decls were written. */
11205 tree specparms = current_function_parms;
11208 /* Must clear this because it might contain TYPE_DECLs declared
11210 current_binding_level->names = NULL;
11212 /* If we're doing semantic analysis, then we'll call pushdecl
11213 for each of these. We must do them in reverse order so that
11214 they end in the correct forward order. */
11215 specparms = nreverse (specparms);
11217 for (parm = specparms; parm; parm = next)
11219 next = TREE_CHAIN (parm);
11220 if (TREE_CODE (parm) == PARM_DECL)
11222 if (DECL_NAME (parm) == NULL_TREE
11223 || TREE_CODE (parm) != VOID_TYPE)
11226 error ("parameter %qD declared void", parm);
11230 /* If we find an enum constant or a type tag,
11231 put it aside for the moment. */
11232 TREE_CHAIN (parm) = NULL_TREE;
11233 nonparms = chainon (nonparms, parm);
11237 /* Get the decls in their original chain order and record in the
11238 function. This is all and only the PARM_DECLs that were
11239 pushed into scope by the loop above. */
11240 DECL_ARGUMENTS (fndecl) = getdecls ();
11243 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11245 /* Now store the final chain of decls for the arguments
11246 as the decl-chain of the current lexical scope.
11247 Put the enumerators in as well, at the front so that
11248 DECL_ARGUMENTS is not modified. */
11249 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11251 if (use_eh_spec_block (current_function_decl))
11252 current_eh_spec_block = begin_eh_spec_block ();
11256 /* We have finished doing semantic analysis on DECL, but have not yet
11257 generated RTL for its body. Save away our current state, so that
11258 when we want to generate RTL later we know what to do. */
11261 save_function_data (tree decl)
11263 struct language_function *f;
11265 /* Save the language-specific per-function data so that we can
11266 get it back when we really expand this function. */
11267 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11270 f = GGC_NEW (struct language_function);
11271 memcpy (f, cp_function_chain, sizeof (struct language_function));
11272 DECL_SAVED_FUNCTION_DATA (decl) = f;
11274 /* Clear out the bits we don't need. */
11275 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11276 f->bindings = NULL;
11277 f->x_local_names = NULL;
11281 /* Set the return value of the constructor (if present). */
11284 finish_constructor_body (void)
11289 if (targetm.cxx.cdtor_returns_this ())
11291 /* Any return from a constructor will end up here. */
11292 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11294 val = DECL_ARGUMENTS (current_function_decl);
11295 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11296 DECL_RESULT (current_function_decl), val);
11297 /* Return the address of the object. */
11298 exprstmt = build_stmt (RETURN_EXPR, val);
11299 add_stmt (exprstmt);
11303 /* Do all the processing for the beginning of a destructor; set up the
11304 vtable pointers and cleanups for bases and members. */
11307 begin_destructor_body (void)
11309 tree compound_stmt;
11311 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11312 issued an error message. We still want to try to process the
11313 body of the function, but initialize_vtbl_ptrs will crash if
11314 TYPE_BINFO is NULL. */
11315 if (COMPLETE_TYPE_P (current_class_type))
11317 compound_stmt = begin_compound_stmt (0);
11318 /* Make all virtual function table pointers in non-virtual base
11319 classes point to CURRENT_CLASS_TYPE's virtual function
11321 initialize_vtbl_ptrs (current_class_ptr);
11322 finish_compound_stmt (compound_stmt);
11324 /* And insert cleanups for our bases and members so that they
11325 will be properly destroyed if we throw. */
11326 push_base_cleanups ();
11330 /* At the end of every destructor we generate code to delete the object if
11331 necessary. Do that now. */
11334 finish_destructor_body (void)
11338 /* Any return from a destructor will end up here; that way all base
11339 and member cleanups will be run when the function returns. */
11340 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11342 /* In a virtual destructor, we must call delete. */
11343 if (DECL_VIRTUAL_P (current_function_decl))
11346 tree virtual_size = cxx_sizeof (current_class_type);
11350 At the point of definition of a virtual destructor (including
11351 an implicit definition), non-placement operator delete shall
11352 be looked up in the scope of the destructor's class and if
11353 found shall be accessible and unambiguous. */
11354 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11356 /*global_p=*/false,
11357 /*placement=*/NULL_TREE,
11358 /*alloc_fn=*/NULL_TREE);
11360 if_stmt = begin_if_stmt ();
11361 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11362 current_in_charge_parm,
11365 finish_expr_stmt (exprstmt);
11366 finish_then_clause (if_stmt);
11367 finish_if_stmt (if_stmt);
11370 if (targetm.cxx.cdtor_returns_this ())
11374 val = DECL_ARGUMENTS (current_function_decl);
11375 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11376 DECL_RESULT (current_function_decl), val);
11377 /* Return the address of the object. */
11378 exprstmt = build_stmt (RETURN_EXPR, val);
11379 add_stmt (exprstmt);
11383 /* Do the necessary processing for the beginning of a function body, which
11384 in this case includes member-initializers, but not the catch clauses of
11385 a function-try-block. Currently, this means opening a binding level
11386 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11389 begin_function_body (void)
11393 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11396 if (processing_template_decl)
11397 /* Do nothing now. */;
11399 /* Always keep the BLOCK node associated with the outermost pair of
11400 curly braces of a function. These are needed for correct
11401 operation of dwarfout.c. */
11402 keep_next_level (true);
11404 stmt = begin_compound_stmt (BCS_FN_BODY);
11406 if (processing_template_decl)
11407 /* Do nothing now. */;
11408 else if (DECL_DESTRUCTOR_P (current_function_decl))
11409 begin_destructor_body ();
11414 /* Do the processing for the end of a function body. Currently, this means
11415 closing out the cleanups for fully-constructed bases and members, and in
11416 the case of the destructor, deleting the object if desired. Again, this
11417 is only meaningful for [cd]tors, since they are the only functions where
11418 there is a significant distinction between the main body and any
11419 function catch clauses. Handling, say, main() return semantics here
11420 would be wrong, as flowing off the end of a function catch clause for
11421 main() would also need to return 0. */
11424 finish_function_body (tree compstmt)
11426 if (compstmt == NULL_TREE)
11429 /* Close the block. */
11430 finish_compound_stmt (compstmt);
11432 if (processing_template_decl)
11433 /* Do nothing now. */;
11434 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11435 finish_constructor_body ();
11436 else if (DECL_DESTRUCTOR_P (current_function_decl))
11437 finish_destructor_body ();
11440 /* Given a function, returns the BLOCK corresponding to the outermost level
11441 of curly braces, skipping the artificial block created for constructor
11445 outer_curly_brace_block (tree fndecl)
11447 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11448 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11449 /* Skip the artificial function body block. */
11450 block = BLOCK_SUBBLOCKS (block);
11454 /* Finish up a function declaration and compile that function
11455 all the way to assembler language output. The free the storage
11456 for the function definition.
11458 FLAGS is a bitwise or of the following values:
11460 We just finished processing the body of an in-class inline
11461 function definition. (This processing will have taken place
11462 after the class definition is complete.) */
11465 finish_function (int flags)
11467 tree fndecl = current_function_decl;
11468 tree fntype, ctype = NULL_TREE;
11469 int inclass_inline = (flags & 2) != 0;
11472 /* When we get some parse errors, we can end up without a
11473 current_function_decl, so cope. */
11474 if (fndecl == NULL_TREE)
11475 return error_mark_node;
11477 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11478 && DECL_VIRTUAL_P (fndecl)
11479 && !processing_template_decl)
11481 tree fnclass = DECL_CONTEXT (fndecl);
11482 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11483 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11486 nested = function_depth > 1;
11487 fntype = TREE_TYPE (fndecl);
11489 /* TREE_READONLY (fndecl) = 1;
11490 This caused &foo to be of type ptr-to-const-function
11491 which then got a warning when stored in a ptr-to-function variable. */
11493 gcc_assert (building_stmt_tree ());
11494 /* The current function is being defined, so its DECL_INITIAL should
11495 be set, and unless there's a multiple definition, it should be
11496 error_mark_node. */
11497 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11499 /* For a cloned function, we've already got all the code we need;
11500 there's no need to add any extra bits. */
11501 if (!DECL_CLONED_FUNCTION_P (fndecl))
11503 if (DECL_MAIN_P (current_function_decl))
11507 /* Make it so that `main' always returns 0 by default (or
11510 stmt = finish_return_stmt (integer_one_node);
11512 stmt = finish_return_stmt (integer_zero_node);
11514 /* Hack. We don't want the middle-end to warn that this
11515 return is unreachable, so put the statement on the
11517 #ifdef USE_MAPPED_LOCATION
11518 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
11520 annotate_with_file_line (stmt, input_filename, 0);
11524 if (use_eh_spec_block (current_function_decl))
11525 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11526 (TREE_TYPE (current_function_decl)),
11527 current_eh_spec_block);
11530 /* If we're saving up tree structure, tie off the function now. */
11531 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11533 finish_fname_decls ();
11535 /* If this function can't throw any exceptions, remember that. */
11536 if (!processing_template_decl
11537 && !cp_function_chain->can_throw
11538 && !flag_non_call_exceptions
11539 && !DECL_REPLACEABLE_P (fndecl))
11540 TREE_NOTHROW (fndecl) = 1;
11542 /* This must come after expand_function_end because cleanups might
11543 have declarations (from inline functions) that need to go into
11544 this function's blocks. */
11546 /* If the current binding level isn't the outermost binding level
11547 for this function, either there is a bug, or we have experienced
11548 syntax errors and the statement tree is malformed. */
11549 if (current_binding_level->kind != sk_function_parms)
11551 /* Make sure we have already experienced errors. */
11552 gcc_assert (errorcount);
11554 /* Throw away the broken statement tree and extra binding
11556 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11558 while (current_binding_level->kind != sk_function_parms)
11560 if (current_binding_level->kind == sk_class)
11561 pop_nested_class ();
11563 poplevel (0, 0, 0);
11566 poplevel (1, 0, 1);
11568 /* Statements should always be full-expressions at the outermost set
11569 of curly braces for a function. */
11570 gcc_assert (stmts_are_full_exprs_p ());
11572 /* Set up the named return value optimization, if we can. Candidate
11573 variables are selected in check_return_value. */
11574 if (current_function_return_value)
11576 tree r = current_function_return_value;
11579 if (r != error_mark_node
11580 /* This is only worth doing for fns that return in memory--and
11581 simpler, since we don't have to worry about promoted modes. */
11582 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11583 /* Only allow this for variables declared in the outer scope of
11584 the function so we know that their lifetime always ends with a
11585 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11586 we were to do this optimization in tree-ssa. */
11587 && (outer = outer_curly_brace_block (fndecl))
11588 && chain_member (r, BLOCK_VARS (outer)))
11589 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11591 current_function_return_value = NULL_TREE;
11594 /* Remember that we were in class scope. */
11595 if (current_class_name)
11596 ctype = current_class_type;
11598 /* Must mark the RESULT_DECL as being in this function. */
11599 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11601 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11602 to the FUNCTION_DECL node itself. */
11603 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11605 /* Save away current state, if appropriate. */
11606 if (!processing_template_decl)
11607 save_function_data (fndecl);
11609 /* Complain if there's just no return statement. */
11610 if (warn_return_type
11611 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11612 && !dependent_type_p (TREE_TYPE (fntype))
11613 && !current_function_returns_value && !current_function_returns_null
11614 /* Don't complain if we abort or throw. */
11615 && !current_function_returns_abnormally
11616 && !DECL_NAME (DECL_RESULT (fndecl))
11617 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11618 inline function, as we might never be compiled separately. */
11619 && (DECL_INLINE (fndecl) || processing_template_decl)
11620 /* Structor return values (if any) are set by the compiler. */
11621 && !DECL_CONSTRUCTOR_P (fndecl)
11622 && !DECL_DESTRUCTOR_P (fndecl))
11623 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11625 /* Store the end of the function, so that we get good line number
11626 info for the epilogue. */
11627 cfun->function_end_locus = input_location;
11629 /* Genericize before inlining. */
11630 if (!processing_template_decl)
11632 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11633 cp_genericize (fndecl);
11634 /* Clear out the bits we don't need. */
11635 f->x_current_class_ptr = NULL;
11636 f->x_current_class_ref = NULL;
11637 f->x_eh_spec_block = NULL;
11638 f->x_in_charge_parm = NULL;
11639 f->x_vtt_parm = NULL;
11640 f->x_return_value = NULL;
11641 f->bindings = NULL;
11642 f->extern_decl_map = NULL;
11644 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11645 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11647 /* Clear out the bits we don't need. */
11648 local_names = NULL;
11650 /* We're leaving the context of this function, so zap cfun. It's still in
11651 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11653 current_function_decl = NULL;
11655 /* If this is an in-class inline definition, we may have to pop the
11656 bindings for the template parameters that we added in
11657 maybe_begin_member_template_processing when start_function was
11659 if (inclass_inline)
11660 maybe_end_member_template_processing ();
11662 /* Leave the scope of the class. */
11664 pop_nested_class ();
11670 /* Let the error reporting routines know that we're outside a
11671 function. For a nested function, this value is used in
11672 cxx_pop_function_context and then reset via pop_function_context. */
11673 current_function_decl = NULL_TREE;
11678 /* Create the FUNCTION_DECL for a function definition.
11679 DECLSPECS and DECLARATOR are the parts of the declaration;
11680 they describe the return type and the name of the function,
11681 but twisted together in a fashion that parallels the syntax of C.
11683 This function creates a binding context for the function body
11684 as well as setting up the FUNCTION_DECL in current_function_decl.
11686 Returns a FUNCTION_DECL on success.
11688 If the DECLARATOR is not suitable for a function (it defines a datum
11689 instead), we return 0, which tells yyparse to report a parse error.
11691 May return void_type_node indicating that this method is actually
11692 a friend. See grokfield for more details.
11694 Came here with a `.pushlevel' .
11696 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11697 CHANGES TO CODE IN `grokfield'. */
11700 start_method (cp_decl_specifier_seq *declspecs,
11701 const cp_declarator *declarator, tree attrlist)
11703 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
11706 if (fndecl == error_mark_node)
11707 return error_mark_node;
11709 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
11711 error ("invalid member function declaration");
11712 return error_mark_node;
11716 cplus_decl_attributes (&fndecl, attrlist, 0);
11718 /* Pass friends other than inline friend functions back. */
11719 if (fndecl == void_type_node)
11722 if (DECL_IN_AGGR_P (fndecl))
11724 if (DECL_CONTEXT (fndecl)
11725 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
11726 error ("%qD is already defined in class %qT", fndecl,
11727 DECL_CONTEXT (fndecl));
11728 return error_mark_node;
11731 check_template_shadow (fndecl);
11733 DECL_DECLARED_INLINE_P (fndecl) = 1;
11734 if (flag_default_inline)
11735 DECL_INLINE (fndecl) = 1;
11737 /* We process method specializations in finish_struct_1. */
11738 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11740 fndecl = push_template_decl (fndecl);
11741 if (fndecl == error_mark_node)
11745 if (! DECL_FRIEND_P (fndecl))
11747 if (TREE_CHAIN (fndecl))
11749 fndecl = copy_node (fndecl);
11750 TREE_CHAIN (fndecl) = NULL_TREE;
11754 finish_decl (fndecl, NULL_TREE, NULL_TREE);
11756 /* Make a place for the parms. */
11757 begin_scope (sk_function_parms, fndecl);
11759 DECL_IN_AGGR_P (fndecl) = 1;
11763 /* Go through the motions of finishing a function definition.
11764 We don't compile this method until after the whole class has
11767 FINISH_METHOD must return something that looks as though it
11768 came from GROKFIELD (since we are defining a method, after all).
11770 This is called after parsing the body of the function definition.
11771 STMTS is the chain of statements that makes up the function body.
11773 DECL is the ..._DECL that `start_method' provided. */
11776 finish_method (tree decl)
11778 tree fndecl = decl;
11783 if (decl == void_type_node)
11786 old_initial = DECL_INITIAL (fndecl);
11788 /* Undo the level for the parms (from start_method).
11789 This is like poplevel, but it causes nothing to be
11790 saved. Saving information here confuses symbol-table
11791 output routines. Besides, this information will
11792 be correctly output when this method is actually
11795 /* Clear out the meanings of the local variables of this level;
11796 also record in each decl which block it belongs to. */
11798 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11800 if (DECL_NAME (link) != NULL_TREE)
11801 pop_binding (DECL_NAME (link), link);
11802 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11803 DECL_CONTEXT (link) = NULL_TREE;
11806 poplevel (0, 0, 0);
11808 DECL_INITIAL (fndecl) = old_initial;
11810 /* We used to check if the context of FNDECL was different from
11811 current_class_type as another way to get inside here. This didn't work
11812 for String.cc in libg++. */
11813 if (DECL_FRIEND_P (fndecl))
11815 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11817 decl = void_type_node;
11824 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11825 we can lay it out later, when and if its type becomes complete. */
11828 maybe_register_incomplete_var (tree var)
11830 gcc_assert (TREE_CODE (var) == VAR_DECL);
11832 /* Keep track of variables with incomplete types. */
11833 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11834 && DECL_EXTERNAL (var))
11836 tree inner_type = TREE_TYPE (var);
11838 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11839 inner_type = TREE_TYPE (inner_type);
11840 inner_type = TYPE_MAIN_VARIANT (inner_type);
11842 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11843 /* RTTI TD entries are created while defining the type_info. */
11844 || (TYPE_LANG_SPECIFIC (inner_type)
11845 && TYPE_BEING_DEFINED (inner_type)))
11846 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11850 /* Called when a class type (given by TYPE) is defined. If there are
11851 any existing VAR_DECLs whose type hsa been completed by this
11852 declaration, update them now. */
11855 complete_vars (tree type)
11857 tree *list = &incomplete_vars;
11859 gcc_assert (CLASS_TYPE_P (type));
11862 if (same_type_p (type, TREE_PURPOSE (*list)))
11864 tree var = TREE_VALUE (*list);
11865 tree type = TREE_TYPE (var);
11866 /* Complete the type of the variable. The VAR_DECL itself
11867 will be laid out in expand_expr. */
11868 complete_type (type);
11869 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11870 /* Remove this entry from the list. */
11871 *list = TREE_CHAIN (*list);
11874 list = &TREE_CHAIN (*list);
11877 /* Check for pending declarations which may have abstract type. */
11878 complete_type_check_abstract (type);
11881 /* If DECL is of a type which needs a cleanup, build and return an
11882 expression to perform that cleanup here. Return NULL_TREE if no
11883 cleanup need be done. */
11886 cxx_maybe_build_cleanup (tree decl)
11892 /* Assume no cleanup is required. */
11893 cleanup = NULL_TREE;
11895 if (error_operand_p (decl))
11898 /* Handle "__attribute__((cleanup))". We run the cleanup function
11899 before the destructor since the destructor is what actually
11900 terminates the lifetime of the object. */
11901 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
11908 /* Get the name specified by the user for the cleanup function. */
11909 id = TREE_VALUE (TREE_VALUE (attr));
11910 /* Look up the name to find the cleanup function to call. It is
11911 important to use lookup_name here because that is what is
11912 used in c-common.c:handle_cleanup_attribute when performing
11913 initial checks on the attribute. Note that those checks
11914 include ensuring that the function found is not an overloaded
11915 function, or an object with an overloaded call operator,
11916 etc.; we can rely on the fact that the functionfound is an
11917 ordinary FUNCTION_DECL. */
11918 fn = lookup_name (id);
11919 arg = build_address (decl);
11921 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
11924 /* Handle ordinary C++ destructors. */
11925 type = TREE_TYPE (decl);
11926 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11928 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11929 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11930 && CLASSTYPE_VBASECLASSES (type));
11934 if (TREE_CODE (type) == ARRAY_TYPE)
11938 cxx_mark_addressable (decl);
11939 addr = build_unary_op (ADDR_EXPR, decl, 0);
11942 /* Optimize for space over speed here. */
11943 if (!has_vbases || flag_expensive_optimizations)
11944 flags |= LOOKUP_NONVIRTUAL;
11946 call = build_delete (TREE_TYPE (addr), addr,
11947 sfk_complete_destructor, flags, 0);
11949 cleanup = build_compound_expr (cleanup, call);
11957 /* When a stmt has been parsed, this function is called. */
11964 /* DECL was originally constructed as a non-static member function,
11965 but turned out to be static. Update it accordingly. */
11968 revert_static_member_fn (tree decl)
11971 tree function = TREE_TYPE (decl);
11972 tree args = TYPE_ARG_TYPES (function);
11974 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11975 != TYPE_UNQUALIFIED)
11976 error ("static member function %q#D declared with type qualifiers", decl);
11978 args = TREE_CHAIN (args);
11979 tmp = build_function_type (TREE_TYPE (function), args);
11980 tmp = build_qualified_type (tmp, cp_type_quals (function));
11981 tmp = build_exception_variant (tmp,
11982 TYPE_RAISES_EXCEPTIONS (function));
11983 TREE_TYPE (decl) = tmp;
11984 if (DECL_ARGUMENTS (decl))
11985 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11986 DECL_STATIC_FUNCTION_P (decl) = 1;
11989 /* Initialize the variables used during compilation of a C++
11993 cxx_push_function_context (struct function * f)
11995 struct language_function *p = GGC_CNEW (struct language_function);
11998 /* Whenever we start a new function, we destroy temporaries in the
12000 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12006 if (DECL_SAVED_FUNCTION_DATA (fn))
12008 /* If we already parsed this function, and we're just expanding it
12009 now, restore saved state. */
12010 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
12012 /* We don't need the saved data anymore. Unless this is an inline
12013 function; we need the named return value info for
12014 declare_return_variable. */
12015 if (! DECL_INLINE (fn))
12016 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
12021 /* Free the language-specific parts of F, now that we've finished
12022 compiling the function. */
12025 cxx_pop_function_context (struct function * f)
12030 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12031 one of the language-independent trees. */
12033 enum cp_tree_node_structure_enum
12034 cp_tree_node_structure (union lang_tree_node * t)
12036 switch (TREE_CODE (&t->generic))
12038 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12039 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12040 case OVERLOAD: return TS_CP_OVERLOAD;
12041 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12042 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
12043 case PTRMEM_CST: return TS_CP_PTRMEM;
12044 case BASELINK: return TS_CP_BASELINK;
12045 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12046 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12047 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12048 default: return TS_CP_GENERIC;
12052 /* Build the void_list_node (void_type_node having been created). */
12054 build_void_list_node (void)
12056 tree t = build_tree_list (NULL_TREE, void_type_node);
12061 cp_missing_noreturn_ok_p (tree decl)
12063 /* A missing noreturn is ok for the `main' function. */
12064 return DECL_MAIN_P (decl);
12067 /* Return the COMDAT group into which DECL should be placed. */
12070 cxx_comdat_group (tree decl)
12074 /* Virtual tables, construction virtual tables, and virtual table
12075 tables all go in a single COMDAT group, named after the primary
12077 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12078 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12079 /* For all other DECLs, the COMDAT group is the mangled name of the
12080 declaration itself. */
12083 while (DECL_THUNK_P (decl))
12085 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12086 into the same section as the target function. In that case
12087 we must return target's name. */
12088 tree target = THUNK_TARGET (decl);
12089 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12090 && DECL_SECTION_NAME (target) != NULL
12091 && DECL_ONE_ONLY (target))
12096 name = DECL_ASSEMBLER_NAME (decl);
12099 return IDENTIFIER_POINTER (name);
12102 #include "gt-cp-decl.h"