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 /* Objects declared at top level: */
2191 /* If at least one is a reference, it's ok. */
2192 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2194 /* Reject two definitions. */
2195 return "redefinition of %q#D";
2199 /* Objects declared with block scope: */
2200 /* Reject two definitions, and reject a definition
2201 together with an external reference. */
2202 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2203 return "redeclaration of %q#D";
2208 /* Hash and equality functions for the named_label table. */
2211 named_label_entry_hash (const void *data)
2213 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2214 return DECL_UID (ent->label_decl);
2218 named_label_entry_eq (const void *a, const void *b)
2220 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2221 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2222 return ent_a->label_decl == ent_b->label_decl;
2225 /* Create a new label, named ID. */
2228 make_label_decl (tree id, int local_p)
2230 struct named_label_entry *ent;
2234 decl = build_decl (LABEL_DECL, id, void_type_node);
2236 DECL_CONTEXT (decl) = current_function_decl;
2237 DECL_MODE (decl) = VOIDmode;
2238 C_DECLARED_LABEL_FLAG (decl) = local_p;
2240 /* Say where one reference is to the label, for the sake of the
2241 error if it is not defined. */
2242 DECL_SOURCE_LOCATION (decl) = input_location;
2244 /* Record the fact that this identifier is bound to this label. */
2245 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2247 /* Create the label htab for the function on demand. */
2249 named_labels = htab_create_ggc (13, named_label_entry_hash,
2250 named_label_entry_eq, NULL);
2252 /* Record this label on the list of labels used in this function.
2253 We do this before calling make_label_decl so that we get the
2254 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2255 ent = GGC_CNEW (struct named_label_entry);
2256 ent->label_decl = decl;
2258 slot = htab_find_slot (named_labels, ent, INSERT);
2259 gcc_assert (*slot == NULL);
2265 /* Look for a label named ID in the current function. If one cannot
2266 be found, create one. (We keep track of used, but undefined,
2267 labels, and complain about them at the end of a function.) */
2270 lookup_label (tree id)
2274 timevar_push (TV_NAME_LOOKUP);
2275 /* You can't use labels at global scope. */
2276 if (current_function_decl == NULL_TREE)
2278 error ("label %qE referenced outside of any function", id);
2279 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2282 /* See if we've already got this label. */
2283 decl = IDENTIFIER_LABEL_VALUE (id);
2284 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2285 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2287 decl = make_label_decl (id, /*local_p=*/0);
2288 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2291 /* Declare a local label named ID. */
2294 declare_local_label (tree id)
2298 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2299 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2300 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2301 current_binding_level->shadowed_labels);
2302 current_binding_level->shadowed_labels = shadow;
2304 decl = make_label_decl (id, /*local_p=*/1);
2305 TREE_VALUE (shadow) = decl;
2310 /* Returns nonzero if it is ill-formed to jump past the declaration of
2311 DECL. Returns 2 if it's also a real problem. */
2314 decl_jump_unsafe (tree decl)
2316 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2317 || TREE_TYPE (decl) == error_mark_node)
2320 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2321 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2324 if (pod_type_p (TREE_TYPE (decl)))
2327 /* The POD stuff is just pedantry; why should it matter if the class
2328 contains a field of pointer to member type? */
2332 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2335 identify_goto (tree decl, const location_t *locus)
2338 pedwarn ("jump to label %qD", decl);
2340 pedwarn ("jump to case label");
2342 pedwarn ("%H from here", locus);
2345 /* Check that a single previously seen jump to a newly defined label
2346 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2347 the jump context; NAMES are the names in scope in LEVEL at the jump
2348 context; LOCUS is the source position of the jump or 0. Returns
2349 true if all is well. */
2352 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2353 bool exited_omp, const location_t *locus)
2355 struct cp_binding_level *b;
2356 bool identified = false, saw_eh = false, saw_omp = false;
2360 identify_goto (decl, locus);
2361 error (" exits OpenMP structured block");
2362 identified = saw_omp = true;
2365 for (b = current_binding_level; b ; b = b->level_chain)
2367 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2369 for (new_decls = b->names; new_decls != old_decls;
2370 new_decls = TREE_CHAIN (new_decls))
2372 int problem = decl_jump_unsafe (new_decls);
2378 identify_goto (decl, locus);
2382 error (" crosses initialization of %q+#D", new_decls);
2384 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2389 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2393 identify_goto (decl, locus);
2396 if (b->kind == sk_try)
2397 error (" enters try block");
2399 error (" enters catch block");
2402 if (b->kind == sk_omp && !saw_omp)
2406 identify_goto (decl, locus);
2409 error (" enters OpenMP structured block");
2418 check_previous_goto (tree decl, struct named_label_use_entry *use)
2420 check_previous_goto_1 (decl, use->binding_level,
2421 use->names_in_scope, use->in_omp_scope,
2422 &use->o_goto_locus);
2426 check_switch_goto (struct cp_binding_level* level)
2428 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2431 /* Check that a new jump to a label DECL is OK. Called by
2432 finish_goto_stmt. */
2435 check_goto (tree decl)
2437 struct named_label_entry *ent, dummy;
2438 bool saw_catch = false, identified = false;
2441 /* We can't know where a computed goto is jumping.
2442 So we assume that it's OK. */
2443 if (TREE_CODE (decl) != LABEL_DECL)
2446 /* We didn't record any information about this label when we created it,
2447 and there's not much point since it's trivial to analyze as a return. */
2448 if (decl == cdtor_label)
2451 dummy.label_decl = decl;
2452 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2453 gcc_assert (ent != NULL);
2455 /* If the label hasn't been defined yet, defer checking. */
2456 if (! DECL_INITIAL (decl))
2458 struct named_label_use_entry *new_use;
2460 /* Don't bother creating another use if the last goto had the
2461 same data, and will therefore create the same set of errors. */
2463 && ent->uses->names_in_scope == current_binding_level->names)
2466 new_use = GGC_NEW (struct named_label_use_entry);
2467 new_use->binding_level = current_binding_level;
2468 new_use->names_in_scope = current_binding_level->names;
2469 new_use->o_goto_locus = input_location;
2470 new_use->in_omp_scope = false;
2472 new_use->next = ent->uses;
2473 ent->uses = new_use;
2477 if (ent->in_try_scope || ent->in_catch_scope
2478 || ent->in_omp_scope || ent->bad_decls)
2480 pedwarn ("jump to label %q+D", decl);
2481 pedwarn (" from here");
2485 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2487 tree b = TREE_VALUE (bad);
2488 int u = decl_jump_unsafe (b);
2490 if (u > 1 && DECL_ARTIFICIAL (b))
2492 /* Can't skip init of __exception_info. */
2493 error ("%J enters catch block", b);
2497 error (" skips initialization of %q+#D", b);
2499 pedwarn (" enters scope of non-POD %q+#D", b);
2502 if (ent->in_try_scope)
2503 error (" enters try block");
2504 else if (ent->in_catch_scope && !saw_catch)
2505 error (" enters catch block");
2507 if (ent->in_omp_scope)
2508 error (" enters OpenMP structured block");
2509 else if (flag_openmp)
2511 struct cp_binding_level *b;
2512 for (b = current_binding_level; b ; b = b->level_chain)
2514 if (b == ent->binding_level)
2516 if (b->kind == sk_omp)
2520 pedwarn ("jump to label %q+D", decl);
2521 pedwarn (" from here");
2524 error (" exits OpenMP structured block");
2531 /* Check that a return is ok wrt OpenMP structured blocks.
2532 Called by finish_return_stmt. Returns true if all is well. */
2535 check_omp_return (void)
2537 struct cp_binding_level *b;
2538 for (b = current_binding_level; b ; b = b->level_chain)
2539 if (b->kind == sk_omp)
2541 error ("invalid exit from OpenMP structured block");
2547 /* Define a label, specifying the location in the source file.
2548 Return the LABEL_DECL node for the label. */
2551 define_label (location_t location, tree name)
2553 struct named_label_entry *ent, dummy;
2554 struct cp_binding_level *p;
2557 timevar_push (TV_NAME_LOOKUP);
2559 decl = lookup_label (name);
2561 dummy.label_decl = decl;
2562 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2563 gcc_assert (ent != NULL);
2565 /* After labels, make any new cleanups in the function go into their
2566 own new (temporary) binding contour. */
2567 for (p = current_binding_level;
2568 p->kind != sk_function_parms;
2570 p->more_cleanups_ok = 0;
2572 if (name == get_identifier ("wchar_t"))
2573 pedwarn ("label named wchar_t");
2575 if (DECL_INITIAL (decl) != NULL_TREE)
2577 error ("duplicate label %qD", decl);
2578 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2582 struct named_label_use_entry *use;
2584 /* Mark label as having been defined. */
2585 DECL_INITIAL (decl) = error_mark_node;
2586 /* Say where in the source. */
2587 DECL_SOURCE_LOCATION (decl) = location;
2589 ent->binding_level = current_binding_level;
2590 ent->names_in_scope = current_binding_level->names;
2592 for (use = ent->uses; use ; use = use->next)
2593 check_previous_goto (decl, use);
2597 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2602 struct cp_binding_level *level;
2603 struct cp_switch *next;
2604 /* The SWITCH_STMT being built. */
2606 /* A splay-tree mapping the low element of a case range to the high
2607 element, or NULL_TREE if there is no high element. Used to
2608 determine whether or not a new case label duplicates an old case
2609 label. We need a tree, rather than simply a hash table, because
2610 of the GNU case range extension. */
2614 /* A stack of the currently active switch statements. The innermost
2615 switch statement is on the top of the stack. There is no need to
2616 mark the stack for garbage collection because it is only active
2617 during the processing of the body of a function, and we never
2618 collect at that point. */
2620 static struct cp_switch *switch_stack;
2622 /* Called right after a switch-statement condition is parsed.
2623 SWITCH_STMT is the switch statement being parsed. */
2626 push_switch (tree switch_stmt)
2628 struct cp_switch *p = XNEW (struct cp_switch);
2629 p->level = current_binding_level;
2630 p->next = switch_stack;
2631 p->switch_stmt = switch_stmt;
2632 p->cases = splay_tree_new (case_compare, NULL, NULL);
2639 struct cp_switch *cs = switch_stack;
2640 location_t switch_location;
2642 /* Emit warnings as needed. */
2643 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2644 switch_location = EXPR_LOCATION (cs->switch_stmt);
2646 switch_location = input_location;
2647 if (!processing_template_decl)
2648 c_do_switch_warnings (cs->cases, switch_location,
2649 SWITCH_STMT_TYPE (cs->switch_stmt),
2650 SWITCH_STMT_COND (cs->switch_stmt));
2652 splay_tree_delete (cs->cases);
2653 switch_stack = switch_stack->next;
2657 /* Note that we've seen a definition of a case label, and complain if this
2658 is a bad place for one. */
2661 finish_case_label (tree low_value, tree high_value)
2664 struct cp_binding_level *p;
2666 if (processing_template_decl)
2670 /* For templates, just add the case label; we'll do semantic
2671 analysis at instantiation-time. */
2672 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2673 return add_stmt (build_case_label (low_value, high_value, label));
2676 /* Find the condition on which this switch statement depends. */
2677 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2678 if (cond && TREE_CODE (cond) == TREE_LIST)
2679 cond = TREE_VALUE (cond);
2681 if (!check_switch_goto (switch_stack->level))
2682 return error_mark_node;
2684 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2685 low_value, high_value);
2687 /* After labels, make any new cleanups in the function go into their
2688 own new (temporary) binding contour. */
2689 for (p = current_binding_level;
2690 p->kind != sk_function_parms;
2692 p->more_cleanups_ok = 0;
2697 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2700 typename_hash (const void* k)
2705 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2706 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2711 typedef struct typename_info {
2719 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2720 really of type `typename_info*' */
2723 typename_compare (const void * k1, const void * k2)
2726 const typename_info *t2;
2729 t2 = (const typename_info *) k2;
2731 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2732 && TYPE_CONTEXT (t1) == t2->scope
2733 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2734 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2735 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2738 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2739 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2741 Returns the new TYPENAME_TYPE. */
2743 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2746 build_typename_type (tree context, tree name, tree fullname,
2747 enum tag_types tag_type)
2755 if (typename_htab == NULL)
2756 typename_htab = htab_create_ggc (61, &typename_hash,
2757 &typename_compare, NULL);
2759 ti.scope = FROB_CONTEXT (context);
2761 ti.template_id = fullname;
2762 ti.enum_p = tag_type == enum_type;
2763 ti.class_p = (tag_type == class_type
2764 || tag_type == record_type
2765 || tag_type == union_type);
2766 hash = (htab_hash_pointer (ti.scope)
2767 ^ htab_hash_pointer (ti.name));
2769 /* See if we already have this type. */
2770 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2775 /* Build the TYPENAME_TYPE. */
2776 t = make_aggr_type (TYPENAME_TYPE);
2777 TYPE_CONTEXT (t) = ti.scope;
2778 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2779 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2780 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2782 /* Build the corresponding TYPE_DECL. */
2783 d = build_decl (TYPE_DECL, name, t);
2784 TYPE_NAME (TREE_TYPE (d)) = d;
2785 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2786 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2787 DECL_ARTIFICIAL (d) = 1;
2789 /* Store it in the hash table. */
2792 /* TYPENAME_TYPEs must always be compared structurally, because
2793 they may or may not resolve down to another type depending on
2794 the currently open classes. */
2795 SET_TYPE_STRUCTURAL_EQUALITY (t);
2801 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2802 provided to name the type. Returns an appropriate type, unless an
2803 error occurs, in which case error_mark_node is returned. If we
2804 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2805 return that, rather than the _TYPE it corresponds to, in other
2806 cases we look through the type decl. If TF_ERROR is set, complain
2807 about errors, otherwise be quiet. */
2810 make_typename_type (tree context, tree name, enum tag_types tag_type,
2811 tsubst_flags_t complain)
2817 if (name == error_mark_node
2818 || context == NULL_TREE
2819 || context == error_mark_node)
2820 return error_mark_node;
2824 if (!(TYPE_LANG_SPECIFIC (name)
2825 && (CLASSTYPE_IS_TEMPLATE (name)
2826 || CLASSTYPE_USE_TEMPLATE (name))))
2827 name = TYPE_IDENTIFIER (name);
2829 /* Create a TEMPLATE_ID_EXPR for the type. */
2830 name = build_nt (TEMPLATE_ID_EXPR,
2831 CLASSTYPE_TI_TEMPLATE (name),
2832 CLASSTYPE_TI_ARGS (name));
2834 else if (TREE_CODE (name) == TYPE_DECL)
2835 name = DECL_NAME (name);
2839 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2841 name = TREE_OPERAND (name, 0);
2842 if (TREE_CODE (name) == TEMPLATE_DECL)
2843 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2844 else if (TREE_CODE (name) == OVERLOAD)
2846 error ("%qD is not a type", name);
2847 return error_mark_node;
2850 if (TREE_CODE (name) == TEMPLATE_DECL)
2852 error ("%qD used without template parameters", name);
2853 return error_mark_node;
2855 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2856 gcc_assert (TYPE_P (context));
2858 /* When the CONTEXT is a dependent type, NAME could refer to a
2859 dependent base class of CONTEXT. So we cannot peek inside it,
2860 even if CONTEXT is a currently open scope. */
2861 if (dependent_type_p (context))
2862 return build_typename_type (context, name, fullname, tag_type);
2864 if (!IS_AGGR_TYPE (context))
2866 if (complain & tf_error)
2867 error ("%q#T is not a class", context);
2868 return error_mark_node;
2871 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2873 /* We should only set WANT_TYPE when we're a nested typename type.
2874 Then we can give better diagnostics if we find a non-type. */
2875 t = lookup_field (context, name, 0, /*want_type=*/true);
2878 if (complain & tf_error)
2879 error (want_template ? "no class template named %q#T in %q#T"
2880 : "no type named %q#T in %q#T", name, context);
2881 return error_mark_node;
2884 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
2886 if (complain & tf_error)
2887 error ("%<typename %T::%D%> names %q#T, which is not a class template",
2889 return error_mark_node;
2891 if (!want_template && TREE_CODE (t) != TYPE_DECL)
2893 if (complain & tf_error)
2894 error ("%<typename %T::%D%> names %q#T, which is not a type",
2896 return error_mark_node;
2899 if (complain & tf_error)
2900 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
2903 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
2905 /*entering_scope=*/0,
2906 tf_warning_or_error | tf_user);
2908 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2914 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2915 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2916 in which case error_mark_node is returned.
2918 If PARM_LIST is non-NULL, also make sure that the template parameter
2919 list of TEMPLATE_DECL matches.
2921 If COMPLAIN zero, don't complain about any errors that occur. */
2924 make_unbound_class_template (tree context, tree name, tree parm_list,
2925 tsubst_flags_t complain)
2931 name = TYPE_IDENTIFIER (name);
2932 else if (DECL_P (name))
2933 name = DECL_NAME (name);
2934 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2936 if (!dependent_type_p (context)
2937 || currently_open_class (context))
2939 tree tmpl = NULL_TREE;
2941 if (IS_AGGR_TYPE (context))
2942 tmpl = lookup_field (context, name, 0, false);
2944 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2946 if (complain & tf_error)
2947 error ("no class template named %q#T in %q#T", name, context);
2948 return error_mark_node;
2952 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2954 if (complain & tf_error)
2956 error ("template parameters do not match template");
2957 error ("%q+D declared here", tmpl);
2959 return error_mark_node;
2962 if (complain & tf_error)
2963 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
2968 /* Build the UNBOUND_CLASS_TEMPLATE. */
2969 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2970 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2971 TREE_TYPE (t) = NULL_TREE;
2972 SET_TYPE_STRUCTURAL_EQUALITY (t);
2974 /* Build the corresponding TEMPLATE_DECL. */
2975 d = build_decl (TEMPLATE_DECL, name, t);
2976 TYPE_NAME (TREE_TYPE (d)) = d;
2977 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2978 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2979 DECL_ARTIFICIAL (d) = 1;
2980 DECL_TEMPLATE_PARMS (d) = parm_list;
2987 /* Push the declarations of builtin types into the namespace.
2988 RID_INDEX is the index of the builtin type in the array
2989 RID_POINTERS. NAME is the name used when looking up the builtin
2990 type. TYPE is the _TYPE node for the builtin type. */
2993 record_builtin_type (enum rid rid_index,
2997 tree rname = NULL_TREE, tname = NULL_TREE;
2998 tree tdecl = NULL_TREE;
3000 if ((int) rid_index < (int) RID_MAX)
3001 rname = ridpointers[(int) rid_index];
3003 tname = get_identifier (name);
3005 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3006 eliminated. Built-in types should not be looked up name; their
3007 names are keywords that the parser can recognize. However, there
3008 is code in c-common.c that uses identifier_global_value to look
3009 up built-in types by name. */
3012 tdecl = build_decl (TYPE_DECL, tname, type);
3013 DECL_ARTIFICIAL (tdecl) = 1;
3014 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3020 tdecl = build_decl (TYPE_DECL, rname, type);
3021 DECL_ARTIFICIAL (tdecl) = 1;
3023 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3026 if (!TYPE_NAME (type))
3027 TYPE_NAME (type) = tdecl;
3030 debug_hooks->type_decl (tdecl, 0);
3033 /* Record one of the standard Java types.
3034 * Declare it as having the given NAME.
3035 * If SIZE > 0, it is the size of one of the integral types;
3036 * otherwise it is the negative of the size of one of the other types. */
3039 record_builtin_java_type (const char* name, int size)
3043 type = make_signed_type (size);
3044 else if (size > -32)
3045 { /* "__java_char" or ""__java_boolean". */
3046 type = make_unsigned_type (-size);
3047 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3050 { /* "__java_float" or ""__java_double". */
3051 type = make_node (REAL_TYPE);
3052 TYPE_PRECISION (type) = - size;
3055 record_builtin_type (RID_MAX, name, type);
3056 decl = TYPE_NAME (type);
3058 /* Suppress generate debug symbol entries for these types,
3059 since for normal C++ they are just clutter.
3060 However, push_lang_context undoes this if extern "Java" is seen. */
3061 DECL_IGNORED_P (decl) = 1;
3063 TYPE_FOR_JAVA (type) = 1;
3067 /* Push a type into the namespace so that the back ends ignore it. */
3070 record_unknown_type (tree type, const char* name)
3072 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3073 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3074 DECL_IGNORED_P (decl) = 1;
3075 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3076 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3077 TYPE_ALIGN (type) = 1;
3078 TYPE_USER_ALIGN (type) = 0;
3079 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3082 /* A string for which we should create an IDENTIFIER_NODE at
3085 typedef struct predefined_identifier
3087 /* The name of the identifier. */
3088 const char *const name;
3089 /* The place where the IDENTIFIER_NODE should be stored. */
3091 /* Nonzero if this is the name of a constructor or destructor. */
3092 const int ctor_or_dtor_p;
3093 } predefined_identifier;
3095 /* Create all the predefined identifiers. */
3098 initialize_predefined_identifiers (void)
3100 const predefined_identifier *pid;
3102 /* A table of identifiers to create at startup. */
3103 static const predefined_identifier predefined_identifiers[] = {
3104 { "C++", &lang_name_cplusplus, 0 },
3105 { "C", &lang_name_c, 0 },
3106 { "Java", &lang_name_java, 0 },
3107 /* Some of these names have a trailing space so that it is
3108 impossible for them to conflict with names written by users. */
3109 { "__ct ", &ctor_identifier, 1 },
3110 { "__base_ctor ", &base_ctor_identifier, 1 },
3111 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3112 { "__dt ", &dtor_identifier, 1 },
3113 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3114 { "__base_dtor ", &base_dtor_identifier, 1 },
3115 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3116 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3117 { "nelts", &nelts_identifier, 0 },
3118 { THIS_NAME, &this_identifier, 0 },
3119 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3120 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3121 { "_vptr", &vptr_identifier, 0 },
3122 { "__vtt_parm", &vtt_parm_identifier, 0 },
3123 { "::", &global_scope_name, 0 },
3124 { "std", &std_identifier, 0 },
3128 for (pid = predefined_identifiers; pid->name; ++pid)
3130 *pid->node = get_identifier (pid->name);
3131 if (pid->ctor_or_dtor_p)
3132 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3136 /* Create the predefined scalar types of C,
3137 and some nodes representing standard constants (0, 1, (void *)0).
3138 Initialize the global binding level.
3139 Make definitions for built-in primitive functions. */
3142 cxx_init_decl_processing (void)
3145 tree void_ftype_ptr;
3147 build_common_tree_nodes (flag_signed_char, false);
3149 /* Create all the identifiers we need. */
3150 initialize_predefined_identifiers ();
3152 /* Create the global variables. */
3153 push_to_top_level ();
3155 current_function_decl = NULL_TREE;
3156 current_binding_level = NULL;
3157 /* Enter the global namespace. */
3158 gcc_assert (global_namespace == NULL_TREE);
3159 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3161 TREE_PUBLIC (global_namespace) = 1;
3162 begin_scope (sk_namespace, global_namespace);
3164 current_lang_name = NULL_TREE;
3166 /* Force minimum function alignment if using the least significant
3167 bit of function pointers to store the virtual bit. */
3168 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
3169 && force_align_functions_log < 1)
3170 force_align_functions_log = 1;
3173 current_lang_name = lang_name_c;
3175 /* Create the `std' namespace. */
3176 push_namespace (std_identifier);
3177 std_node = current_namespace;
3180 c_common_nodes_and_builtins ();
3182 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3183 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3184 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3185 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3186 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3187 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3188 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3189 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3191 integer_two_node = build_int_cst (NULL_TREE, 2);
3192 integer_three_node = build_int_cst (NULL_TREE, 3);
3194 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3195 truthvalue_type_node = boolean_type_node;
3196 truthvalue_false_node = boolean_false_node;
3197 truthvalue_true_node = boolean_true_node;
3199 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3202 record_builtin_type (RID_MAX, NULL, string_type_node);
3205 delta_type_node = ptrdiff_type_node;
3206 vtable_index_type = ptrdiff_type_node;
3208 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3209 void_ftype = build_function_type (void_type_node, void_list_node);
3210 void_ftype_ptr = build_function_type (void_type_node,
3211 tree_cons (NULL_TREE,
3215 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3217 /* C++ extensions */
3219 unknown_type_node = make_node (UNKNOWN_TYPE);
3220 record_unknown_type (unknown_type_node, "unknown type");
3222 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3223 TREE_TYPE (unknown_type_node) = unknown_type_node;
3225 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3227 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3228 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3231 /* Make sure we get a unique function type, so we can give
3232 its pointer type a name. (This wins for gdb.) */
3233 tree vfunc_type = make_node (FUNCTION_TYPE);
3234 TREE_TYPE (vfunc_type) = integer_type_node;
3235 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3236 layout_type (vfunc_type);
3238 vtable_entry_type = build_pointer_type (vfunc_type);
3240 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3243 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3244 layout_type (vtbl_type_node);
3245 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3246 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3247 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3248 layout_type (vtbl_ptr_type_node);
3249 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3251 push_namespace (get_identifier ("__cxxabiv1"));
3252 abi_node = current_namespace;
3255 global_type_node = make_node (LANG_TYPE);
3256 record_unknown_type (global_type_node, "global type");
3259 current_lang_name = lang_name_cplusplus;
3263 tree bad_alloc_type_node;
3264 tree bad_alloc_decl;
3265 tree newtype, deltype;
3266 tree ptr_ftype_sizetype;
3268 push_namespace (std_identifier);
3269 bad_alloc_id = get_identifier ("bad_alloc");
3270 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3271 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3273 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3274 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3275 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3279 = build_function_type (ptr_type_node,
3280 tree_cons (NULL_TREE,
3283 newtype = build_exception_variant
3284 (ptr_ftype_sizetype, add_exception_specifier
3285 (NULL_TREE, bad_alloc_type_node, -1));
3286 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3287 push_cp_library_fn (NEW_EXPR, newtype);
3288 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3289 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3290 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3294 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3296 /* Perform other language dependent initializations. */
3297 init_class_processing ();
3298 init_rtti_processing ();
3300 if (flag_exceptions)
3301 init_exception_processing ();
3303 if (! supports_one_only ())
3306 make_fname_decl = cp_make_fname_decl;
3307 start_fname_decls ();
3309 /* Show we use EH for cleanups. */
3310 if (flag_exceptions)
3311 using_eh_for_cleanups ();
3314 /* Generate an initializer for a function naming variable from
3315 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3316 filled in with the type of the init. */
3319 cp_fname_init (const char* name, tree *type_p)
3321 tree domain = NULL_TREE;
3323 tree init = NULL_TREE;
3328 length = strlen (name);
3329 domain = build_index_type (size_int (length));
3330 init = build_string (length + 1, name);
3333 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3334 type = build_cplus_array_type (type, domain);
3339 TREE_TYPE (init) = type;
3341 init = error_mark_node;
3346 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3347 decl, NAME is the initialization string and TYPE_DEP indicates whether
3348 NAME depended on the type of the function. We make use of that to detect
3349 __PRETTY_FUNCTION__ inside a template fn. This is being done
3350 lazily at the point of first use, so we mustn't push the decl now. */
3353 cp_make_fname_decl (tree id, int type_dep)
3355 const char *const name = (type_dep && processing_template_decl
3356 ? NULL : fname_as_string (type_dep));
3358 tree init = cp_fname_init (name, &type);
3359 tree decl = build_decl (VAR_DECL, id, type);
3362 free ((char *) name);
3364 /* As we're using pushdecl_with_scope, we must set the context. */
3365 DECL_CONTEXT (decl) = current_function_decl;
3366 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3368 TREE_STATIC (decl) = 1;
3369 TREE_READONLY (decl) = 1;
3370 DECL_ARTIFICIAL (decl) = 1;
3372 TREE_USED (decl) = 1;
3374 if (current_function_decl)
3376 struct cp_binding_level *b = current_binding_level;
3377 while (b->level_chain->kind != sk_function_parms)
3379 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3380 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3381 LOOKUP_ONLYCONVERTING);
3384 pushdecl_top_level_and_finish (decl, init);
3390 builtin_function_1 (tree decl, tree context)
3392 tree id = DECL_NAME (decl);
3393 const char *name = IDENTIFIER_POINTER (id);
3395 retrofit_lang_decl (decl);
3397 /* All nesting of C++ functions is lexical; there is never a "static
3398 chain" in the sense of GNU C nested functions. */
3399 DECL_NO_STATIC_CHAIN (decl) = 1;
3401 DECL_ARTIFICIAL (decl) = 1;
3402 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3403 SET_DECL_LANGUAGE (decl, lang_c);
3404 /* Runtime library routines are, by definition, available in an
3405 external shared object. */
3406 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3407 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3409 DECL_CONTEXT (decl) = context;
3413 /* A function in the user's namespace should have an explicit
3414 declaration before it is used. Mark the built-in function as
3415 anticipated but not actually declared. */
3416 if (name[0] != '_' || name[1] != '_')
3417 DECL_ANTICIPATED (decl) = 1;
3423 cxx_builtin_function (tree decl)
3425 tree id = DECL_NAME (decl);
3426 const char *name = IDENTIFIER_POINTER (id);
3427 /* All builtins that don't begin with an '_' should additionally
3428 go in the 'std' namespace. */
3431 tree decl2 = copy_node(decl);
3432 push_namespace (std_identifier);
3433 builtin_function_1 (decl2, std_node);
3437 return builtin_function_1 (decl, NULL_TREE);
3440 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3441 function. Not called directly. */
3444 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3446 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3447 DECL_EXTERNAL (fn) = 1;
3448 TREE_PUBLIC (fn) = 1;
3449 DECL_ARTIFICIAL (fn) = 1;
3450 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3451 SET_DECL_LANGUAGE (fn, lang_c);
3452 /* Runtime library routines are, by definition, available in an
3453 external shared object. */
3454 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3455 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3459 /* Returns the _DECL for a library function with C linkage.
3460 We assume that such functions never throw; if this is incorrect,
3461 callers should unset TREE_NOTHROW. */
3464 build_library_fn (tree name, tree type)
3466 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3467 TREE_NOTHROW (fn) = 1;
3471 /* Returns the _DECL for a library function with C++ linkage. */
3474 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3476 tree fn = build_library_fn_1 (name, operator_code, type);
3477 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3478 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3479 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3483 /* Like build_library_fn, but takes a C string instead of an
3487 build_library_fn_ptr (const char* name, tree type)
3489 return build_library_fn (get_identifier (name), type);
3492 /* Like build_cp_library_fn, but takes a C string instead of an
3496 build_cp_library_fn_ptr (const char* name, tree type)
3498 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3501 /* Like build_library_fn, but also pushes the function so that we will
3502 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3505 push_library_fn (tree name, tree type)
3507 tree fn = build_library_fn (name, type);
3508 pushdecl_top_level (fn);
3512 /* Like build_cp_library_fn, but also pushes the function so that it
3513 will be found by normal lookup. */
3516 push_cp_library_fn (enum tree_code operator_code, tree type)
3518 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3525 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3529 push_void_library_fn (tree name, tree parmtypes)
3531 tree type = build_function_type (void_type_node, parmtypes);
3532 return push_library_fn (name, type);
3535 /* Like push_library_fn, but also note that this function throws
3536 and does not return. Used for __throw_foo and the like. */
3539 push_throw_library_fn (tree name, tree type)
3541 tree fn = push_library_fn (name, type);
3542 TREE_THIS_VOLATILE (fn) = 1;
3543 TREE_NOTHROW (fn) = 0;
3547 /* When we call finish_struct for an anonymous union, we create
3548 default copy constructors and such. But, an anonymous union
3549 shouldn't have such things; this function undoes the damage to the
3550 anonymous union type T.
3552 (The reason that we create the synthesized methods is that we don't
3553 distinguish `union { int i; }' from `typedef union { int i; } U'.
3554 The first is an anonymous union; the second is just an ordinary
3558 fixup_anonymous_aggr (tree t)
3562 /* Wipe out memory of synthesized methods. */
3563 TYPE_HAS_CONSTRUCTOR (t) = 0;
3564 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3565 TYPE_HAS_INIT_REF (t) = 0;
3566 TYPE_HAS_CONST_INIT_REF (t) = 0;
3567 TYPE_HAS_ASSIGN_REF (t) = 0;
3568 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3570 /* Splice the implicitly generated functions out of the TYPE_METHODS
3572 q = &TYPE_METHODS (t);
3575 if (DECL_ARTIFICIAL (*q))
3576 *q = TREE_CHAIN (*q);
3578 q = &TREE_CHAIN (*q);
3581 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3582 if (TYPE_METHODS (t))
3583 error ("%Jan anonymous union cannot have function members",
3584 TYPE_MAIN_DECL (t));
3586 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3587 assignment operators (because they cannot have these methods themselves).
3588 For anonymous unions this is already checked because they are not allowed
3589 in any union, otherwise we have to check it. */
3590 if (TREE_CODE (t) != UNION_TYPE)
3594 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3595 if (TREE_CODE (field) == FIELD_DECL)
3597 type = TREE_TYPE (field);
3598 if (CLASS_TYPE_P (type))
3600 if (TYPE_NEEDS_CONSTRUCTING (type))
3601 error ("member %q+#D with constructor not allowed "
3602 "in anonymous aggregate", field);
3603 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3604 error ("member %q+#D with destructor not allowed "
3605 "in anonymous aggregate", field);
3606 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3607 error ("member %q+#D with copy assignment operator "
3608 "not allowed in anonymous aggregate", field);
3614 /* Make sure that a declaration with no declarator is well-formed, i.e.
3615 just declares a tagged type or anonymous union.
3617 Returns the type declared; or NULL_TREE if none. */
3620 check_tag_decl (cp_decl_specifier_seq *declspecs)
3622 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3623 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3624 /* If a class, struct, or enum type is declared by the DECLSPECS
3625 (i.e, if a class-specifier, enum-specifier, or non-typename
3626 elaborated-type-specifier appears in the DECLSPECS),
3627 DECLARED_TYPE is set to the corresponding type. */
3628 tree declared_type = NULL_TREE;
3629 bool error_p = false;
3631 if (declspecs->multiple_types_p)
3632 error ("multiple types in one declaration");
3633 else if (declspecs->redefined_builtin_type)
3635 if (!in_system_header)
3636 pedwarn ("redeclaration of C++ built-in type %qT",
3637 declspecs->redefined_builtin_type);
3642 && TYPE_P (declspecs->type)
3643 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3644 && IS_AGGR_TYPE (declspecs->type))
3645 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3646 declared_type = declspecs->type;
3647 else if (declspecs->type == error_mark_node)
3649 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3650 pedwarn ("declaration does not declare anything");
3651 /* Check for an anonymous union. */
3652 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3653 && TYPE_ANONYMOUS_P (declared_type))
3655 /* 7/3 In a simple-declaration, the optional init-declarator-list
3656 can be omitted only when declaring a class (clause 9) or
3657 enumeration (7.2), that is, when the decl-specifier-seq contains
3658 either a class-specifier, an elaborated-type-specifier with
3659 a class-key (9.1), or an enum-specifier. In these cases and
3660 whenever a class-specifier or enum-specifier is present in the
3661 decl-specifier-seq, the identifiers in these specifiers are among
3662 the names being declared by the declaration (as class-name,
3663 enum-names, or enumerators, depending on the syntax). In such
3664 cases, and except for the declaration of an unnamed bit-field (9.6),
3665 the decl-specifier-seq shall introduce one or more names into the
3666 program, or shall redeclare a name introduced by a previous
3667 declaration. [Example:
3668 enum { }; // ill-formed
3669 typedef class { }; // ill-formed
3673 error ("missing type-name in typedef-declaration");
3676 /* Anonymous unions are objects, so they can have specifiers. */;
3677 SET_ANON_AGGR_TYPE_P (declared_type);
3679 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3680 && !in_system_header)
3681 pedwarn ("ISO C++ prohibits anonymous structs");
3686 if (declspecs->specs[(int)ds_inline]
3687 || declspecs->specs[(int)ds_virtual])
3688 error ("%qs can only be specified for functions",
3689 declspecs->specs[(int)ds_inline]
3690 ? "inline" : "virtual");
3692 && (!current_class_type
3693 || current_scope () != current_class_type))
3694 error ("%<friend%> can only be specified inside a class");
3695 else if (declspecs->specs[(int)ds_explicit])
3696 error ("%<explicit%> can only be specified for constructors");
3697 else if (declspecs->storage_class)
3698 error ("a storage class can only be specified for objects "
3700 else if (declspecs->specs[(int)ds_const]
3701 || declspecs->specs[(int)ds_volatile]
3702 || declspecs->specs[(int)ds_restrict]
3703 || declspecs->specs[(int)ds_thread])
3704 error ("qualifiers can only be specified for objects "
3706 else if (saw_typedef)
3707 warning (0, "%<typedef%> was ignored in this declaration");
3710 return declared_type;
3713 /* Called when a declaration is seen that contains no names to declare.
3714 If its type is a reference to a structure, union or enum inherited
3715 from a containing scope, shadow that tag name for the current scope
3716 with a forward reference.
3717 If its type defines a new named structure or union
3718 or defines an enum, it is valid but we need not do anything here.
3719 Otherwise, it is an error.
3721 C++: may have to grok the declspecs to learn about static,
3722 complain for anonymous unions.
3724 Returns the TYPE declared -- or NULL_TREE if none. */
3727 shadow_tag (cp_decl_specifier_seq *declspecs)
3729 tree t = check_tag_decl (declspecs);
3734 if (declspecs->attributes)
3736 warning (0, "attribute ignored in declaration of %q+#T", t);
3737 warning (0, "attribute for %q+#T must follow the %qs keyword",
3738 t, class_key_or_enum_as_string (t));
3742 if (maybe_process_partial_specialization (t) == error_mark_node)
3745 /* This is where the variables in an anonymous union are
3746 declared. An anonymous union declaration looks like:
3748 because there is no declarator after the union, the parser
3749 sends that declaration here. */
3750 if (ANON_AGGR_TYPE_P (t))
3752 fixup_anonymous_aggr (t);
3754 if (TYPE_FIELDS (t))
3756 tree decl = grokdeclarator (/*declarator=*/NULL,
3757 declspecs, NORMAL, 0, NULL);
3758 finish_anon_union (decl);
3765 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3768 groktypename (cp_decl_specifier_seq *type_specifiers,
3769 const cp_declarator *declarator)
3773 attrs = type_specifiers->attributes;
3774 type_specifiers->attributes = NULL_TREE;
3775 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3777 cplus_decl_attributes (&type, attrs, 0);
3781 /* Decode a declarator in an ordinary declaration or data definition.
3782 This is called as soon as the type information and variable name
3783 have been parsed, before parsing the initializer if any.
3784 Here we create the ..._DECL node, fill in its type,
3785 and put it on the list of decls for the current context.
3786 The ..._DECL node is returned as the value.
3788 Exception: for arrays where the length is not specified,
3789 the type is left null, to be filled in by `cp_finish_decl'.
3791 Function definitions do not come here; they go to start_function
3792 instead. However, external and forward declarations of functions
3793 do go through here. Structure field declarations are done by
3794 grokfield and not through here. */
3797 start_decl (const cp_declarator *declarator,
3798 cp_decl_specifier_seq *declspecs,
3801 tree prefix_attributes,
3802 tree *pushed_scope_p)
3809 *pushed_scope_p = NULL_TREE;
3811 /* An object declared as __attribute__((deprecated)) suppresses
3812 warnings of uses of other deprecated items. */
3813 if (lookup_attribute ("deprecated", attributes))
3814 deprecated_state = DEPRECATED_SUPPRESS;
3816 attributes = chainon (attributes, prefix_attributes);
3818 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3821 deprecated_state = DEPRECATED_NORMAL;
3823 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3824 || decl == error_mark_node)
3825 return error_mark_node;
3827 type = TREE_TYPE (decl);
3829 context = DECL_CONTEXT (decl);
3833 *pushed_scope_p = push_scope (context);
3835 /* We are only interested in class contexts, later. */
3836 if (TREE_CODE (context) == NAMESPACE_DECL)
3837 context = NULL_TREE;
3841 /* Is it valid for this decl to have an initializer at all?
3842 If not, set INITIALIZED to zero, which will indirectly
3843 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3844 switch (TREE_CODE (decl))
3847 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3848 return error_mark_node;
3851 error ("function %q#D is initialized like a variable", decl);
3852 return error_mark_node;
3860 if (! toplevel_bindings_p ()
3861 && DECL_EXTERNAL (decl))
3862 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3864 DECL_EXTERNAL (decl) = 0;
3865 if (toplevel_bindings_p ())
3866 TREE_STATIC (decl) = 1;
3869 /* Set attributes here so if duplicate decl, will have proper attributes. */
3870 cplus_decl_attributes (&decl, attributes, 0);
3872 /* Dllimported symbols cannot be defined. Static data members (which
3873 can be initialized in-class and dllimported) go through grokfield,
3874 not here, so we don't need to exclude those decls when checking for
3876 if (initialized && DECL_DLLIMPORT_P (decl))
3878 error ("definition of %q#D is marked %<dllimport%>", decl);
3879 DECL_DLLIMPORT_P (decl) = 0;
3882 /* If #pragma weak was used, mark the decl weak now. */
3883 maybe_apply_pragma_weak (decl);
3885 if (TREE_CODE (decl) == FUNCTION_DECL
3886 && DECL_DECLARED_INLINE_P (decl)
3887 && DECL_UNINLINABLE (decl)
3888 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3889 warning (0, "inline function %q+D given attribute noinline", decl);
3891 if (context && COMPLETE_TYPE_P (complete_type (context)))
3893 if (TREE_CODE (decl) == VAR_DECL)
3895 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3896 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3897 error ("%q#D is not a static member of %q#T", decl, context);
3900 if (DECL_CONTEXT (field) != context)
3902 if (!same_type_p (DECL_CONTEXT (field), context))
3903 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3904 "to be defined as %<%T::%D%>",
3905 DECL_CONTEXT (field), DECL_NAME (decl),
3906 context, DECL_NAME (decl));
3907 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3909 if (processing_specialization
3910 && template_class_depth (context) == 0
3911 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3912 error ("template header not allowed in member definition "
3913 "of explicitly specialized class");
3914 /* Static data member are tricky; an in-class initialization
3915 still doesn't provide a definition, so the in-class
3916 declaration will have DECL_EXTERNAL set, but will have an
3917 initialization. Thus, duplicate_decls won't warn
3918 about this situation, and so we check here. */
3919 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
3920 error ("duplicate initialization of %qD", decl);
3921 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3927 tree field = check_classfn (context, decl,
3928 (processing_template_decl
3929 > template_class_depth (context))
3930 ? current_template_parms
3932 if (field && duplicate_decls (decl, field,
3933 /*newdecl_is_friend=*/false))
3937 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3938 DECL_IN_AGGR_P (decl) = 0;
3939 /* Do not mark DECL as an explicit specialization if it was not
3940 already marked as an instantiation; a declaration should
3941 never be marked as a specialization unless we know what
3942 template is being specialized. */
3943 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3945 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3947 /* [temp.expl.spec] An explicit specialization of a static data
3948 member of a template is a definition if the declaration
3949 includes an initializer; otherwise, it is a declaration.
3951 We check for processing_specialization so this only applies
3952 to the new specialization syntax. */
3953 if (!initialized && processing_specialization)
3954 DECL_EXTERNAL (decl) = 1;
3957 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3958 pedwarn ("declaration of %q#D outside of class is not definition",
3962 was_public = TREE_PUBLIC (decl);
3964 /* Enter this declaration into the symbol table. */
3965 tem = maybe_push_decl (decl);
3967 if (processing_template_decl)
3968 tem = push_template_decl (tem);
3969 if (tem == error_mark_node)
3970 return error_mark_node;
3972 /* Tell the back end to use or not use .common as appropriate. If we say
3973 -fconserve-space, we want this to save .data space, at the expense of
3974 wrong semantics. If we say -fno-conserve-space, we want this to
3975 produce errors about redefs; to do this we force variables into the
3977 if (flag_conserve_space
3978 && TREE_CODE (tem) == VAR_DECL
3979 && TREE_PUBLIC (tem)
3980 && !DECL_THREAD_LOCAL_P (tem)
3981 && !have_global_bss_p ())
3982 DECL_COMMON (tem) = 1;
3984 if (TREE_CODE (tem) == VAR_DECL
3985 && DECL_NAMESPACE_SCOPE_P (tem) && !TREE_PUBLIC (tem) && !was_public
3986 && !DECL_THIS_STATIC (tem) && !DECL_ARTIFICIAL (tem))
3988 /* This is a const variable with implicit 'static'. Set
3989 DECL_THIS_STATIC so we can tell it from variables that are
3990 !TREE_PUBLIC because of the anonymous namespace. */
3991 gcc_assert (cp_type_readonly (TREE_TYPE (tem)));
3992 DECL_THIS_STATIC (tem) = 1;
3995 if (!processing_template_decl && TREE_CODE (tem) == VAR_DECL)
3996 start_decl_1 (tem, initialized);
4002 start_decl_1 (tree decl, bool initialized)
4006 gcc_assert (!processing_template_decl);
4008 if (error_operand_p (decl))
4011 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4012 type = TREE_TYPE (decl);
4015 /* Is it valid for this decl to have an initializer at all?
4016 If not, set INITIALIZED to zero, which will indirectly
4017 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4019 /* Don't allow initializations for incomplete types except for
4020 arrays which might be completed by the initialization. */
4021 if (COMPLETE_TYPE_P (complete_type (type)))
4022 ; /* A complete type is ok. */
4023 else if (TREE_CODE (type) != ARRAY_TYPE)
4025 error ("variable %q#D has initializer but incomplete type", decl);
4027 type = TREE_TYPE (decl) = error_mark_node;
4029 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4031 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4032 error ("elements of array %q#D have incomplete type", decl);
4033 /* else we already gave an error in start_decl. */
4037 else if (IS_AGGR_TYPE (type)
4038 && ! DECL_EXTERNAL (decl))
4040 if (!COMPLETE_TYPE_P (complete_type (type)))
4042 error ("aggregate %q#D has incomplete type and cannot be defined",
4044 /* Change the type so that assemble_variable will give
4045 DECL an rtl we can live with: (mem (const_int 0)). */
4046 type = TREE_TYPE (decl) = error_mark_node;
4050 /* If any base type in the hierarchy of TYPE needs a constructor,
4051 then we set initialized to 1. This way any nodes which are
4052 created for the purposes of initializing this aggregate
4053 will live as long as it does. This is necessary for global
4054 aggregates which do not have their initializers processed until
4055 the end of the file. */
4056 initialized = TYPE_NEEDS_CONSTRUCTING (type);
4060 /* Create a new scope to hold this declaration if necessary.
4061 Whether or not a new scope is necessary cannot be determined
4062 until after the type has been completed; if the type is a
4063 specialization of a class template it is not until after
4064 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4065 will be set correctly. */
4066 maybe_push_cleanup_level (type);
4069 /* Handle initialization of references. DECL, TYPE, and INIT have the
4070 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4071 but will be set to a new CLEANUP_STMT if a temporary is created
4072 that must be destroyed subsequently.
4074 Returns an initializer expression to use to initialize DECL, or
4075 NULL if the initialization can be performed statically.
4077 Quotes on semantics can be found in ARM 8.4.3. */
4080 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4084 if (init == NULL_TREE)
4086 if ((DECL_LANG_SPECIFIC (decl) == 0
4087 || DECL_IN_AGGR_P (decl) == 0)
4088 && ! DECL_THIS_EXTERN (decl))
4089 error ("%qD declared as reference but not initialized", decl);
4093 if (TREE_CODE (init) == CONSTRUCTOR)
4095 error ("ISO C++ forbids use of initializer list to "
4096 "initialize reference %qD", decl);
4100 if (TREE_CODE (init) == TREE_LIST)
4101 init = build_x_compound_expr_from_list (init, "initializer");
4103 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4104 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4105 /* Note: default conversion is only called in very special cases. */
4106 init = decay_conversion (init);
4108 /* Convert INIT to the reference type TYPE. This may involve the
4109 creation of a temporary, whose lifetime must be the same as that
4110 of the reference. If so, a DECL_EXPR for the temporary will be
4111 added just after the DECL_EXPR for DECL. That's why we don't set
4112 DECL_INITIAL for local references (instead assigning to them
4113 explicitly); we need to allow the temporary to be initialized
4115 tmp = initialize_reference (type, init, decl, cleanup);
4117 if (tmp == error_mark_node)
4119 else if (tmp == NULL_TREE)
4121 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4125 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4128 DECL_INITIAL (decl) = tmp;
4133 /* Designated initializers in arrays are not supported in GNU C++.
4134 The parser cannot detect this error since it does not know whether
4135 a given brace-enclosed initializer is for a class type or for an
4136 array. This function checks that CE does not use a designated
4137 initializer. If it does, an error is issued. Returns true if CE
4138 is valid, i.e., does not have a designated initializer. */
4141 check_array_designated_initializer (const constructor_elt *ce)
4143 /* Designated initializers for array elements are not supported. */
4146 /* The parser only allows identifiers as designated
4148 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4149 error ("name %qD used in a GNU-style designated "
4150 "initializer for an array", ce->index);
4157 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4158 array until we finish parsing the initializer. If that's the
4159 situation we're in, update DECL accordingly. */
4162 maybe_deduce_size_from_array_init (tree decl, tree init)
4164 tree type = TREE_TYPE (decl);
4166 if (TREE_CODE (type) == ARRAY_TYPE
4167 && TYPE_DOMAIN (type) == NULL_TREE
4168 && TREE_CODE (decl) != TYPE_DECL)
4170 /* do_default is really a C-ism to deal with tentative definitions.
4171 But let's leave it here to ease the eventual merge. */
4172 int do_default = !DECL_EXTERNAL (decl);
4173 tree initializer = init ? init : DECL_INITIAL (decl);
4176 /* Check that there are no designated initializers in INIT, as
4177 those are not supported in GNU C++, and as the middle-end
4178 will crash if presented with a non-numeric designated
4180 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4182 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4183 constructor_elt *ce;
4186 VEC_iterate (constructor_elt, v, i, ce);
4188 if (!check_array_designated_initializer (ce))
4194 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4198 error ("initializer fails to determine size of %qD", decl);
4199 TREE_TYPE (decl) = error_mark_node;
4201 else if (failure == 2)
4205 error ("array size missing in %qD", decl);
4206 TREE_TYPE (decl) = error_mark_node;
4208 /* If a `static' var's size isn't known, make it extern as
4209 well as static, so it does not get allocated. If it's not
4210 `static', then don't mark it extern; finish_incomplete_decl
4211 will give it a default size and it will get allocated. */
4212 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4213 DECL_EXTERNAL (decl) = 1;
4215 else if (failure == 3)
4217 error ("zero-size array %qD", decl);
4218 TREE_TYPE (decl) = error_mark_node;
4222 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4224 layout_decl (decl, 0);
4228 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4229 any appropriate error messages regarding the layout. */
4232 layout_var_decl (tree decl)
4236 type = TREE_TYPE (decl);
4237 if (type == error_mark_node)
4240 /* If we haven't already layed out this declaration, do so now.
4241 Note that we must not call complete type for an external object
4242 because it's type might involve templates that we are not
4243 supposed to instantiate yet. (And it's perfectly valid to say
4244 `extern X x' for some incomplete type `X'.) */
4245 if (!DECL_EXTERNAL (decl))
4246 complete_type (type);
4247 if (!DECL_SIZE (decl)
4248 && TREE_TYPE (decl) != error_mark_node
4249 && (COMPLETE_TYPE_P (type)
4250 || (TREE_CODE (type) == ARRAY_TYPE
4251 && !TYPE_DOMAIN (type)
4252 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4253 layout_decl (decl, 0);
4255 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4257 /* An automatic variable with an incomplete type: that is an error.
4258 Don't talk about array types here, since we took care of that
4259 message in grokdeclarator. */
4260 error ("storage size of %qD isn't known", decl);
4261 TREE_TYPE (decl) = error_mark_node;
4264 /* Keep this code around in case we later want to control debug info
4265 based on whether a type is "used". (jason 1999-11-11) */
4267 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4268 /* Let debugger know it should output info for this type. */
4269 note_debug_info_needed (ttype);
4271 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4272 note_debug_info_needed (DECL_CONTEXT (decl));
4275 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4276 && DECL_SIZE (decl) != NULL_TREE
4277 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4279 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4280 constant_expression_warning (DECL_SIZE (decl));
4282 error ("storage size of %qD isn't constant", decl);
4286 /* If a local static variable is declared in an inline function, or if
4287 we have a weak definition, we must endeavor to create only one
4288 instance of the variable at link-time. */
4291 maybe_commonize_var (tree decl)
4293 /* Static data in a function with comdat linkage also has comdat
4295 if (TREE_STATIC (decl)
4296 /* Don't mess with __FUNCTION__. */
4297 && ! DECL_ARTIFICIAL (decl)
4298 && DECL_FUNCTION_SCOPE_P (decl)
4299 /* Unfortunately, import_export_decl has not always been called
4300 before the function is processed, so we cannot simply check
4302 && (DECL_COMDAT (DECL_CONTEXT (decl))
4303 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4304 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4305 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4309 /* With weak symbols, we simply make the variable COMDAT;
4310 that will cause copies in multiple translations units to
4312 comdat_linkage (decl);
4316 if (DECL_INITIAL (decl) == NULL_TREE
4317 || DECL_INITIAL (decl) == error_mark_node)
4319 /* Without weak symbols, we can use COMMON to merge
4320 uninitialized variables. */
4321 TREE_PUBLIC (decl) = 1;
4322 DECL_COMMON (decl) = 1;
4326 /* While for initialized variables, we must use internal
4327 linkage -- which means that multiple copies will not
4329 TREE_PUBLIC (decl) = 0;
4330 DECL_COMMON (decl) = 0;
4331 warning (0, "sorry: semantics of inline function static "
4332 "data %q+#D are wrong (you'll wind up "
4333 "with multiple copies)", decl);
4334 warning (0, "%J you can work around this by removing "
4340 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4341 /* Set it up again; we might have set DECL_INITIAL since the last
4343 comdat_linkage (decl);
4346 /* Issue an error message if DECL is an uninitialized const variable. */
4349 check_for_uninitialized_const_var (tree decl)
4351 tree type = TREE_TYPE (decl);
4353 /* ``Unless explicitly declared extern, a const object does not have
4354 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4356 if (TREE_CODE (decl) == VAR_DECL
4357 && TREE_CODE (type) != REFERENCE_TYPE
4358 && CP_TYPE_CONST_P (type)
4359 && !TYPE_NEEDS_CONSTRUCTING (type)
4360 && !DECL_INITIAL (decl))
4361 error ("uninitialized const %qD", decl);
4365 /* Structure holding the current initializer being processed by reshape_init.
4366 CUR is a pointer to the current element being processed, END is a pointer
4367 after the last element present in the initializer. */
4368 typedef struct reshape_iterator_t
4370 constructor_elt *cur;
4371 constructor_elt *end;
4374 static tree reshape_init_r (tree, reshape_iter *, bool);
4376 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4377 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4378 initialized. If there are no more such fields, the return value
4382 next_initializable_field (tree field)
4385 && (TREE_CODE (field) != FIELD_DECL
4386 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4387 || DECL_ARTIFICIAL (field)))
4388 field = TREE_CHAIN (field);
4393 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4394 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4395 INTEGER_CST representing the size of the array minus one (the maximum index),
4396 or NULL_TREE if the array was declared without specifying the size. D is
4397 the iterator within the constructor. */
4400 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4403 bool sized_array_p = (max_index != NULL_TREE);
4404 unsigned HOST_WIDE_INT max_index_cst = 0;
4405 unsigned HOST_WIDE_INT index;
4407 /* The initializer for an array is always a CONSTRUCTOR. */
4408 new_init = build_constructor (NULL_TREE, NULL);
4412 /* Minus 1 is used for zero sized arrays. */
4413 if (integer_all_onesp (max_index))
4416 if (host_integerp (max_index, 1))
4417 max_index_cst = tree_low_cst (max_index, 1);
4418 /* sizetype is sign extended, not zero extended. */
4420 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4424 /* Loop until there are no more initializers. */
4426 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4431 check_array_designated_initializer (d->cur);
4432 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4433 if (elt_init == error_mark_node)
4434 return error_mark_node;
4435 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4441 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4442 Parameters are the same of reshape_init_r. */
4445 reshape_init_array (tree type, reshape_iter *d)
4447 tree max_index = NULL_TREE;
4449 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4451 if (TYPE_DOMAIN (type))
4452 max_index = array_type_nelts (type);
4454 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4457 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4458 Parameters are the same of reshape_init_r. */
4461 reshape_init_vector (tree type, reshape_iter *d)
4463 tree max_index = NULL_TREE;
4466 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4468 if (COMPOUND_LITERAL_P (d->cur->value))
4470 tree value = d->cur->value;
4471 if (!same_type_p (TREE_TYPE (value), type))
4473 error ("invalid type %qT as initializer for a vector of type %qT",
4474 TREE_TYPE (d->cur->value), type);
4475 value = error_mark_node;
4481 /* For a vector, the representation type is a struct
4482 containing a single member which is an array of the
4483 appropriate size. */
4484 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4485 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4486 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4488 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4491 /* Subroutine of reshape_init_r, processes the initializers for classes
4492 or union. Parameters are the same of reshape_init_r. */
4495 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4500 gcc_assert (CLASS_TYPE_P (type));
4502 /* The initializer for a class is always a CONSTRUCTOR. */
4503 new_init = build_constructor (NULL_TREE, NULL);
4504 field = next_initializable_field (TYPE_FIELDS (type));
4510 An initializer for an aggregate member that is an
4511 empty class shall have the form of an empty
4512 initializer-list {}. */
4513 if (!first_initializer_p)
4515 error ("initializer for %qT must be brace-enclosed", type);
4516 return error_mark_node;
4521 /* Loop through the initializable fields, gathering initializers. */
4522 while (d->cur != d->end)
4526 /* Handle designated initializers, as an extension. */
4529 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4531 if (!field || TREE_CODE (field) != FIELD_DECL)
4533 error ("%qT has no non-static data member named %qD", type,
4535 return error_mark_node;
4539 /* If we processed all the member of the class, we are done. */
4543 field_init = reshape_init_r (TREE_TYPE (field), d,
4544 /*first_initializer_p=*/false);
4545 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4549 When a union is initialized with a brace-enclosed
4550 initializer, the braces shall only contain an
4551 initializer for the first member of the union. */
4552 if (TREE_CODE (type) == UNION_TYPE)
4555 field = next_initializable_field (TREE_CHAIN (field));
4561 /* Subroutine of reshape_init, which processes a single initializer (part of
4562 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4563 iterator within the CONSTRUCTOR which points to the initializer to process.
4564 FIRST_INITIALIZER_P is true if this is the first initializer of the
4565 CONSTRUCTOR node. */
4568 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4570 tree init = d->cur->value;
4572 /* A non-aggregate type is always initialized with a single
4574 if (!CP_AGGREGATE_TYPE_P (type))
4576 /* It is invalid to initialize a non-aggregate type with a
4577 brace-enclosed initializer.
4578 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4579 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4580 a CONSTRUCTOR (with a record type). */
4581 if (TREE_CODE (init) == CONSTRUCTOR
4582 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4584 error ("braces around scalar initializer for type %qT", type);
4585 init = error_mark_node;
4594 All implicit type conversions (clause _conv_) are considered when
4595 initializing the aggregate member with an initializer from an
4596 initializer-list. If the initializer can initialize a member,
4597 the member is initialized. Otherwise, if the member is itself a
4598 non-empty subaggregate, brace elision is assumed and the
4599 initializer is considered for the initialization of the first
4600 member of the subaggregate. */
4601 if (TREE_CODE (init) != CONSTRUCTOR
4602 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4608 /* [dcl.init.string]
4610 A char array (whether plain char, signed char, or unsigned char)
4611 can be initialized by a string-literal (optionally enclosed in
4612 braces); a wchar_t array can be initialized by a wide
4613 string-literal (optionally enclosed in braces). */
4614 if (TREE_CODE (type) == ARRAY_TYPE
4615 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4617 tree str_init = init;
4619 /* Strip one level of braces if and only if they enclose a single
4620 element (as allowed by [dcl.init.string]). */
4621 if (!first_initializer_p
4622 && TREE_CODE (str_init) == CONSTRUCTOR
4623 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4625 str_init = VEC_index (constructor_elt,
4626 CONSTRUCTOR_ELTS (str_init), 0)->value;
4629 /* If it's a string literal, then it's the initializer for the array
4630 as a whole. Otherwise, continue with normal initialization for
4631 array types (one value per array element). */
4632 if (TREE_CODE (str_init) == STRING_CST)
4639 /* The following cases are about aggregates. If we are not within a full
4640 initializer already, and there is not a CONSTRUCTOR, it means that there
4641 is a missing set of braces (that is, we are processing the case for
4642 which reshape_init exists). */
4643 if (!first_initializer_p)
4645 if (TREE_CODE (init) == CONSTRUCTOR)
4647 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4648 /* There is no need to reshape pointer-to-member function
4649 initializers, as they are always constructed correctly
4650 by the front end. */
4652 else if (COMPOUND_LITERAL_P (init))
4653 /* For a nested compound literal, there is no need to reshape since
4654 brace elision is not allowed. Even if we decided to allow it,
4655 we should add a call to reshape_init in finish_compound_literal,
4656 before calling digest_init, so changing this code would still
4657 not be necessary. */
4658 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4662 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4663 return reshape_init (type, init);
4667 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4671 /* Dispatch to specialized routines. */
4672 if (CLASS_TYPE_P (type))
4673 return reshape_init_class (type, d, first_initializer_p);
4674 else if (TREE_CODE (type) == ARRAY_TYPE)
4675 return reshape_init_array (type, d);
4676 else if (TREE_CODE (type) == VECTOR_TYPE)
4677 return reshape_init_vector (type, d);
4682 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4683 brace-enclosed aggregate initializer.
4685 INIT is the CONSTRUCTOR containing the list of initializers describing
4686 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4687 It may not presently match the shape of the TYPE; for example:
4689 struct S { int a; int b; };
4690 struct S a[] = { 1, 2, 3, 4 };
4692 Here INIT will hold a VEC of four elements, rather than a
4693 VEC of two elements, each itself a VEC of two elements. This
4694 routine transforms INIT from the former form into the latter. The
4695 revised CONSTRUCTOR node is returned. */
4698 reshape_init (tree type, tree init)
4700 VEC(constructor_elt, gc) *v;
4704 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4706 v = CONSTRUCTOR_ELTS (init);
4708 /* An empty constructor does not need reshaping, and it is always a valid
4710 if (VEC_empty (constructor_elt, v))
4713 /* Recurse on this CONSTRUCTOR. */
4714 d.cur = VEC_index (constructor_elt, v, 0);
4715 d.end = d.cur + VEC_length (constructor_elt, v);
4717 new_init = reshape_init_r (type, &d, true);
4718 if (new_init == error_mark_node)
4719 return error_mark_node;
4721 /* Make sure all the element of the constructor were used. Otherwise,
4722 issue an error about exceeding initializers. */
4724 error ("too many initializers for %qT", type);
4729 /* Verify INIT (the initializer for DECL), and record the
4730 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4731 grok_reference_init.
4733 If the return value is non-NULL, it is an expression that must be
4734 evaluated dynamically to initialize DECL. */
4737 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4739 tree type = TREE_TYPE (decl);
4740 tree init_code = NULL;
4742 /* Things that are going to be initialized need to have complete
4744 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4746 if (type == error_mark_node)
4747 /* We will have already complained. */
4750 if (TREE_CODE (type) == ARRAY_TYPE)
4752 tree element_type = TREE_TYPE (type);
4754 /* The array type itself need not be complete, because the
4755 initializer may tell us how many elements are in the array.
4756 But, the elements of the array must be complete. */
4757 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4759 error ("elements of array %q#D have incomplete type", decl);
4762 /* It is not valid to initialize a VLA. */
4764 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4765 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4767 error ("variable-sized object %qD may not be initialized", decl);
4771 else if (!COMPLETE_TYPE_P (type))
4773 error ("%qD has incomplete type", decl);
4774 TREE_TYPE (decl) = error_mark_node;
4778 /* There is no way to make a variable-sized class type in GNU C++. */
4779 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4781 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4783 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4784 if (SCALAR_TYPE_P (type))
4788 error ("scalar object %qD requires one element in initializer",
4790 TREE_TYPE (decl) = error_mark_node;
4794 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4796 /* A non-aggregate that is not a scalar cannot be initialized
4797 via an initializer-list in C++98. */
4798 error ("braces around initializer for non-aggregate type %qT",
4800 TREE_TYPE (decl) = error_mark_node;
4805 if (TREE_CODE (decl) == CONST_DECL)
4807 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4809 DECL_INITIAL (decl) = init;
4811 gcc_assert (init != NULL_TREE);
4814 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4815 init = grok_reference_init (decl, type, init, cleanup);
4818 /* Do not reshape constructors of vectors (they don't need to be
4820 if (TREE_CODE (init) == CONSTRUCTOR
4821 && !COMPOUND_LITERAL_P (init)
4822 && !TREE_TYPE (init)) /* ptrmemfunc */
4824 init = reshape_init (type, init);
4826 if ((*targetm.vector_opaque_p) (type))
4828 error ("opaque vector types cannot be initialized");
4829 init = error_mark_node;
4833 /* If DECL has an array type without a specific bound, deduce the
4834 array size from the initializer. */
4835 maybe_deduce_size_from_array_init (decl, init);
4836 type = TREE_TYPE (decl);
4837 if (type == error_mark_node)
4840 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4842 if (TREE_CODE (type) == ARRAY_TYPE)
4843 goto initialize_aggr;
4844 else if (TREE_CODE (init) == CONSTRUCTOR)
4846 if (TYPE_NON_AGGREGATE_CLASS (type))
4848 error ("%qD must be initialized by constructor, "
4851 init = error_mark_node;
4854 goto dont_use_constructor;
4858 int saved_stmts_are_full_exprs_p;
4861 saved_stmts_are_full_exprs_p = 0;
4862 if (building_stmt_tree ())
4864 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4865 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4867 init = build_aggr_init (decl, init, flags);
4868 if (building_stmt_tree ())
4869 current_stmt_tree ()->stmts_are_full_exprs_p =
4870 saved_stmts_are_full_exprs_p;
4876 dont_use_constructor:
4877 if (TREE_CODE (init) != TREE_VEC)
4879 init_code = store_init_value (decl, init);
4880 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4881 && DECL_INITIAL (decl)
4882 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4883 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4884 warning (0, "array %qD initialized by parenthesized string literal %qE",
4885 decl, DECL_INITIAL (decl));
4890 else if (DECL_EXTERNAL (decl))
4892 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4893 goto initialize_aggr;
4894 else if (IS_AGGR_TYPE (type))
4896 tree core_type = strip_array_types (type);
4898 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4899 error ("structure %qD with uninitialized const members", decl);
4900 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4901 error ("structure %qD with uninitialized reference members", decl);
4903 check_for_uninitialized_const_var (decl);
4906 check_for_uninitialized_const_var (decl);
4908 if (init && init != error_mark_node)
4909 init_code = build2 (INIT_EXPR, type, decl, init);
4914 /* If DECL is not a local variable, give it RTL. */
4917 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4919 int toplev = toplevel_bindings_p ();
4921 const char *filename;
4923 /* Set the DECL_ASSEMBLER_NAME for the object. */
4926 /* The `register' keyword, when used together with an
4927 asm-specification, indicates that the variable should be
4928 placed in a particular register. */
4929 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4931 set_user_assembler_name (decl, asmspec);
4932 DECL_HARD_REGISTER (decl) = 1;
4936 if (TREE_CODE (decl) == FUNCTION_DECL
4937 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4938 set_builtin_user_assembler_name (decl, asmspec);
4939 set_user_assembler_name (decl, asmspec);
4943 /* Handle non-variables up front. */
4944 if (TREE_CODE (decl) != VAR_DECL)
4946 rest_of_decl_compilation (decl, toplev, at_eof);
4950 /* If we see a class member here, it should be a static data
4952 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4954 gcc_assert (TREE_STATIC (decl));
4955 /* An in-class declaration of a static data member should be
4956 external; it is only a declaration, and not a definition. */
4957 if (init == NULL_TREE)
4958 gcc_assert (DECL_EXTERNAL (decl));
4961 /* We don't create any RTL for local variables. */
4962 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4965 /* We defer emission of local statics until the corresponding
4966 DECL_EXPR is expanded. */
4967 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4969 /* We try to defer namespace-scope static constants so that they are
4970 not emitted into the object file unnecessarily. */
4971 filename = input_filename;
4972 if (!DECL_VIRTUAL_P (decl)
4973 && TREE_READONLY (decl)
4974 && DECL_INITIAL (decl) != NULL_TREE
4975 && DECL_INITIAL (decl) != error_mark_node
4977 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4979 && !TREE_PUBLIC (decl))
4981 /* Fool with the linkage of static consts according to #pragma
4983 struct c_fileinfo *finfo = get_fileinfo (filename);
4984 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4986 TREE_PUBLIC (decl) = 1;
4987 DECL_EXTERNAL (decl) = finfo->interface_only;
4992 /* Likewise for template instantiations. */
4993 else if (DECL_LANG_SPECIFIC (decl)
4994 && DECL_IMPLICIT_INSTANTIATION (decl))
4997 /* If we're not deferring, go ahead and assemble the variable. */
4999 rest_of_decl_compilation (decl, toplev, at_eof);
5002 /* Generate code to initialize DECL (a local variable). */
5005 initialize_local_var (tree decl, tree init)
5007 tree type = TREE_TYPE (decl);
5010 gcc_assert (TREE_CODE (decl) == VAR_DECL
5011 || TREE_CODE (decl) == RESULT_DECL);
5012 gcc_assert (!TREE_STATIC (decl));
5014 if (DECL_SIZE (decl) == NULL_TREE)
5016 /* If we used it already as memory, it must stay in memory. */
5017 DECL_INITIAL (decl) = NULL_TREE;
5018 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5021 if (DECL_SIZE (decl) && type != error_mark_node)
5025 /* Compute and store the initial value. */
5026 already_used = TREE_USED (decl) || TREE_USED (type);
5028 /* Perform the initialization. */
5031 int saved_stmts_are_full_exprs_p;
5033 gcc_assert (building_stmt_tree ());
5034 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5035 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5036 finish_expr_stmt (init);
5037 current_stmt_tree ()->stmts_are_full_exprs_p =
5038 saved_stmts_are_full_exprs_p;
5041 /* Set this to 0 so we can tell whether an aggregate which was
5042 initialized was ever used. Don't do this if it has a
5043 destructor, so we don't complain about the 'resource
5044 allocation is initialization' idiom. Now set
5045 attribute((unused)) on types so decls of that type will be
5046 marked used. (see TREE_USED, above.) */
5047 if (TYPE_NEEDS_CONSTRUCTING (type)
5049 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5050 && DECL_NAME (decl))
5051 TREE_USED (decl) = 0;
5052 else if (already_used)
5053 TREE_USED (decl) = 1;
5056 /* Generate a cleanup, if necessary. */
5057 cleanup = cxx_maybe_build_cleanup (decl);
5058 if (DECL_SIZE (decl) && cleanup)
5059 finish_decl_cleanup (decl, cleanup);
5062 /* DECL is a VAR_DECL for a compiler-generated variable with static
5063 storage duration (like a virtual table) whose initializer is a
5064 compile-time constant. INIT must be either a TREE_LIST of values,
5065 or a CONSTRUCTOR. Initialize the variable and provide it to the
5069 initialize_artificial_var (tree decl, tree init)
5071 gcc_assert (DECL_ARTIFICIAL (decl));
5072 if (TREE_CODE (init) == TREE_LIST)
5073 init = build_constructor_from_list (NULL_TREE, init);
5074 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5075 DECL_INITIAL (decl) = init;
5076 DECL_INITIALIZED_P (decl) = 1;
5077 determine_visibility (decl);
5078 layout_var_decl (decl);
5079 maybe_commonize_var (decl);
5080 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5083 /* Finish processing of a declaration;
5084 install its line number and initial value.
5085 If the length of an array type is not known before,
5086 it must be determined now, from the initial value, or it is an error.
5088 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5089 true, then INIT is an integral constant expression.
5091 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5092 if the (init) syntax was used. */
5095 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5096 tree asmspec_tree, int flags)
5100 const char *asmspec = NULL;
5101 int was_readonly = 0;
5102 bool var_definition_p = false;
5103 int saved_processing_template_decl;
5105 if (decl == error_mark_node)
5110 error ("assignment (not initialization) in declaration");
5114 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5115 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5116 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5118 type = TREE_TYPE (decl);
5119 if (type == error_mark_node)
5122 /* Assume no cleanup is required. */
5123 cleanup = NULL_TREE;
5124 saved_processing_template_decl = processing_template_decl;
5126 /* If a name was specified, get the string. */
5127 if (global_scope_p (current_binding_level))
5128 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5129 if (asmspec_tree && asmspec_tree != error_mark_node)
5130 asmspec = TREE_STRING_POINTER (asmspec_tree);
5132 if (current_class_type
5133 && CP_DECL_CONTEXT (decl) == current_class_type
5134 && TYPE_BEING_DEFINED (current_class_type)
5135 && (DECL_INITIAL (decl) || init))
5136 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5138 if (processing_template_decl)
5140 bool type_dependent_p;
5142 /* Add this declaration to the statement-tree. */
5143 if (at_function_scope_p ())
5144 add_decl_expr (decl);
5146 type_dependent_p = dependent_type_p (type);
5148 if (init && init_const_expr_p)
5150 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5151 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5152 TREE_CONSTANT (decl) = 1;
5156 || !DECL_CLASS_SCOPE_P (decl)
5157 || !DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5159 || value_dependent_expression_p (init)
5160 /* Check also if initializer is a value dependent
5161 { integral_constant_expression }. */
5162 || (TREE_CODE (init) == CONSTRUCTOR
5163 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init)) == 1
5164 && value_dependent_expression_p
5165 (VEC_index (constructor_elt,
5166 CONSTRUCTOR_ELTS (init), 0)->value)))
5169 DECL_INITIAL (decl) = init;
5170 if (TREE_CODE (decl) == VAR_DECL
5171 && !DECL_PRETTY_FUNCTION_P (decl)
5172 && !type_dependent_p)
5173 maybe_deduce_size_from_array_init (decl, init);
5177 init = fold_non_dependent_expr (init);
5178 processing_template_decl = 0;
5181 /* Take care of TYPE_DECLs up front. */
5182 if (TREE_CODE (decl) == TYPE_DECL)
5184 if (type != error_mark_node
5185 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5187 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5188 warning (0, "shadowing previous type declaration of %q#D", decl);
5189 set_identifier_type_value (DECL_NAME (decl), decl);
5192 /* If we have installed this as the canonical typedef for this
5193 type, and that type has not been defined yet, delay emitting
5194 the debug information for it, as we will emit it later. */
5195 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5196 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5197 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5199 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5204 /* A reference will be modified here, as it is initialized. */
5205 if (! DECL_EXTERNAL (decl)
5206 && TREE_READONLY (decl)
5207 && TREE_CODE (type) == REFERENCE_TYPE)
5210 TREE_READONLY (decl) = 0;
5213 if (TREE_CODE (decl) == VAR_DECL)
5215 /* Only PODs can have thread-local storage. Other types may require
5216 various kinds of non-trivial initialization. */
5217 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5218 error ("%qD cannot be thread-local because it has non-POD type %qT",
5219 decl, TREE_TYPE (decl));
5220 /* If this is a local variable that will need a mangled name,
5221 register it now. We must do this before processing the
5222 initializer for the variable, since the initialization might
5223 require a guard variable, and since the mangled name of the
5224 guard variable will depend on the mangled name of this
5226 if (!processing_template_decl
5227 && DECL_FUNCTION_SCOPE_P (decl)
5228 && TREE_STATIC (decl)
5229 && !DECL_ARTIFICIAL (decl))
5230 push_local_name (decl);
5231 /* Convert the initializer to the type of DECL, if we have not
5232 already initialized DECL. */
5233 if (!DECL_INITIALIZED_P (decl)
5234 /* If !DECL_EXTERNAL then DECL is being defined. In the
5235 case of a static data member initialized inside the
5236 class-specifier, there can be an initializer even if DECL
5237 is *not* defined. */
5238 && (!DECL_EXTERNAL (decl) || init))
5242 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5243 if (init_const_expr_p)
5245 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5246 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5247 TREE_CONSTANT (decl) = 1;
5250 init = check_initializer (decl, init, flags, &cleanup);
5251 /* Thread-local storage cannot be dynamically initialized. */
5252 if (DECL_THREAD_LOCAL_P (decl) && init)
5254 error ("%qD is thread-local and so cannot be dynamically "
5255 "initialized", decl);
5259 /* Check that the initializer for a static data member was a
5260 constant. Although we check in the parser that the
5261 initializer is an integral constant expression, we do not
5262 simplify division-by-zero at the point at which it
5263 occurs. Therefore, in:
5265 struct S { static const int i = 7 / 0; };
5267 we issue an error at this point. It would
5268 probably be better to forbid division by zero in
5269 integral constant expressions. */
5270 if (DECL_EXTERNAL (decl) && init)
5272 error ("%qD cannot be initialized by a non-constant expression"
5273 " when being declared", decl);
5274 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5282 The memory occupied by any object of static storage
5283 duration is zero-initialized at program startup before
5284 any other initialization takes place.
5286 We cannot create an appropriate initializer until after
5287 the type of DECL is finalized. If DECL_INITIAL is set,
5288 then the DECL is statically initialized, and any
5289 necessary zero-initialization has already been performed. */
5290 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5291 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5292 /*nelts=*/NULL_TREE,
5293 /*static_storage_p=*/true);
5294 /* Remember that the initialization for this variable has
5296 DECL_INITIALIZED_P (decl) = 1;
5297 /* This declaration is the definition of this variable,
5298 unless we are initializing a static data member within
5299 the class specifier. */
5300 if (!DECL_EXTERNAL (decl))
5301 var_definition_p = true;
5303 /* If the variable has an array type, lay out the type, even if
5304 there is no initializer. It is valid to index through the
5305 array, and we must get TYPE_ALIGN set correctly on the array
5307 else if (TREE_CODE (type) == ARRAY_TYPE)
5311 /* Add this declaration to the statement-tree. This needs to happen
5312 after the call to check_initializer so that the DECL_EXPR for a
5313 reference temp is added before the DECL_EXPR for the reference itself. */
5314 if (at_function_scope_p ())
5315 add_decl_expr (decl);
5317 /* Let the middle end know about variables and functions -- but not
5318 static data members in uninstantiated class templates. */
5319 if (!saved_processing_template_decl
5320 && (TREE_CODE (decl) == VAR_DECL
5321 || TREE_CODE (decl) == FUNCTION_DECL))
5323 if (TREE_CODE (decl) == VAR_DECL)
5325 layout_var_decl (decl);
5326 maybe_commonize_var (decl);
5329 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5331 /* Check for abstractness of the type. Notice that there is no
5332 need to strip array types here since the check for those types
5333 is already done within create_array_type_for_decl. */
5334 if (TREE_CODE (type) == FUNCTION_TYPE
5335 || TREE_CODE (type) == METHOD_TYPE)
5336 abstract_virtuals_error (decl, TREE_TYPE (type));
5338 abstract_virtuals_error (decl, type);
5340 /* This needs to happen after the linkage is set. */
5341 determine_visibility (decl);
5343 if (TREE_CODE (decl) == FUNCTION_DECL
5344 || TREE_TYPE (decl) == error_mark_node)
5345 /* No initialization required. */
5347 else if (DECL_EXTERNAL (decl)
5348 && ! (DECL_LANG_SPECIFIC (decl)
5349 && DECL_NOT_REALLY_EXTERN (decl)))
5352 DECL_INITIAL (decl) = init;
5356 /* A variable definition. */
5357 if (DECL_FUNCTION_SCOPE_P (decl))
5359 /* Initialize the local variable. */
5360 if (processing_template_decl)
5361 DECL_INITIAL (decl) = init;
5362 else if (!TREE_STATIC (decl))
5363 initialize_local_var (decl, init);
5366 /* If a variable is defined, and then a subsequent
5367 definition with external linkage is encountered, we will
5368 get here twice for the same variable. We want to avoid
5369 calling expand_static_init more than once. For variables
5370 that are not static data members, we can call
5371 expand_static_init only when we actually process the
5372 initializer. It is not legal to redeclare a static data
5373 member, so this issue does not arise in that case. */
5374 if (var_definition_p && TREE_STATIC (decl))
5376 /* If a TREE_READONLY variable needs initialization
5377 at runtime, it is no longer readonly and we need to
5378 avoid MEM_READONLY_P being set on RTL created for it. */
5381 if (TREE_READONLY (decl))
5382 TREE_READONLY (decl) = 0;
5385 expand_static_init (decl, init);
5390 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5391 reference, insert it in the statement-tree now. */
5393 push_cleanup (decl, cleanup, false);
5396 processing_template_decl = saved_processing_template_decl;
5399 TREE_READONLY (decl) = 1;
5401 /* If this was marked 'used', be sure it will be output. */
5402 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5403 mark_decl_referenced (decl);
5406 /* This is here for a midend callback from c-common.c. */
5409 finish_decl (tree decl, tree init, tree asmspec_tree)
5411 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5414 /* Returns a declaration for a VAR_DECL as if:
5416 extern "C" TYPE NAME;
5418 had been seen. Used to create compiler-generated global
5422 declare_global_var (tree name, tree type)
5426 push_to_top_level ();
5427 decl = build_decl (VAR_DECL, name, type);
5428 TREE_PUBLIC (decl) = 1;
5429 DECL_EXTERNAL (decl) = 1;
5430 DECL_ARTIFICIAL (decl) = 1;
5431 /* If the user has explicitly declared this variable (perhaps
5432 because the code we are compiling is part of a low-level runtime
5433 library), then it is possible that our declaration will be merged
5434 with theirs by pushdecl. */
5435 decl = pushdecl (decl);
5436 finish_decl (decl, NULL_TREE, NULL_TREE);
5437 pop_from_top_level ();
5442 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5443 if "__cxa_atexit" is not being used) corresponding to the function
5444 to be called when the program exits. */
5447 get_atexit_fn_ptr_type (void)
5452 if (!atexit_fn_ptr_type_node)
5454 if (flag_use_cxa_atexit
5455 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5456 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5457 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5459 /* The parameter to "atexit" is "void (*)(void)". */
5460 arg_types = void_list_node;
5462 fn_type = build_function_type (void_type_node, arg_types);
5463 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5466 return atexit_fn_ptr_type_node;
5469 /* Returns a pointer to the `atexit' function. Note that if
5470 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5471 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5474 get_atexit_node (void)
5481 bool use_aeabi_atexit;
5486 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5488 /* The declaration for `__cxa_atexit' is:
5490 int __cxa_atexit (void (*)(void *), void *, void *)
5492 We build up the argument types and then then function type
5495 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5496 /* First, build the pointer-to-function type for the first
5498 fn_ptr_type = get_atexit_fn_ptr_type ();
5499 /* Then, build the rest of the argument types. */
5500 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5501 if (use_aeabi_atexit)
5503 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5504 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5508 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5509 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5511 /* And the final __cxa_atexit type. */
5512 fn_type = build_function_type (integer_type_node, arg_types);
5513 fn_ptr_type = build_pointer_type (fn_type);
5514 if (use_aeabi_atexit)
5515 name = "__aeabi_atexit";
5517 name = "__cxa_atexit";
5521 /* The declaration for `atexit' is:
5523 int atexit (void (*)());
5525 We build up the argument types and then then function type
5527 fn_ptr_type = get_atexit_fn_ptr_type ();
5528 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5529 /* Build the final atexit type. */
5530 fn_type = build_function_type (integer_type_node, arg_types);
5534 /* Now, build the function declaration. */
5535 push_lang_context (lang_name_c);
5536 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5537 mark_used (atexit_fndecl);
5538 pop_lang_context ();
5539 atexit_node = decay_conversion (atexit_fndecl);
5544 /* Returns the __dso_handle VAR_DECL. */
5547 get_dso_handle_node (void)
5549 if (dso_handle_node)
5550 return dso_handle_node;
5552 /* Declare the variable. */
5553 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5556 return dso_handle_node;
5559 /* Begin a new function with internal linkage whose job will be simply
5560 to destroy some particular variable. */
5562 static GTY(()) int start_cleanup_cnt;
5565 start_cleanup_fn (void)
5570 bool use_cxa_atexit = flag_use_cxa_atexit
5571 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5573 push_to_top_level ();
5575 /* No need to mangle this. */
5576 push_lang_context (lang_name_c);
5578 /* Build the name of the function. */
5579 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5580 /* Build the function declaration. */
5581 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5582 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5583 /* It's a function with internal linkage, generated by the
5585 TREE_PUBLIC (fndecl) = 0;
5586 DECL_ARTIFICIAL (fndecl) = 1;
5587 /* Make the function `inline' so that it is only emitted if it is
5588 actually needed. It is unlikely that it will be inlined, since
5589 it is only called via a function pointer, but we avoid unnecessary
5590 emissions this way. */
5591 DECL_INLINE (fndecl) = 1;
5592 DECL_DECLARED_INLINE_P (fndecl) = 1;
5593 DECL_INTERFACE_KNOWN (fndecl) = 1;
5594 /* Build the parameter. */
5599 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5600 DECL_CONTEXT (parmdecl) = fndecl;
5601 TREE_USED (parmdecl) = 1;
5602 DECL_ARGUMENTS (fndecl) = parmdecl;
5606 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5608 pop_lang_context ();
5610 return current_function_decl;
5613 /* Finish the cleanup function begun by start_cleanup_fn. */
5616 end_cleanup_fn (void)
5618 expand_or_defer_fn (finish_function (0));
5620 pop_from_top_level ();
5623 /* Generate code to handle the destruction of DECL, an object with
5624 static storage duration. */
5627 register_dtor_fn (tree decl)
5636 type = TREE_TYPE (decl);
5637 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5638 return void_zero_node;
5640 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5641 a class object, we can just pass the destructor to
5642 "__cxa_atexit"; we don't have to build a temporary function to do
5644 use_dtor = (flag_use_cxa_atexit
5645 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5646 && CLASS_TYPE_P (type));
5651 /* Find the destructor. */
5652 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5653 gcc_assert (idx >= 0);
5654 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5655 /* Make sure it is accessible. */
5656 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5660 /* Call build_cleanup before we enter the anonymous function so
5661 that any access checks will be done relative to the current
5662 scope, rather than the scope of the anonymous function. */
5663 build_cleanup (decl);
5665 /* Now start the function. */
5666 cleanup = start_cleanup_fn ();
5668 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5669 to the original function, rather than the anonymous one. That
5670 will make the back end think that nested functions are in use,
5671 which causes confusion. */
5672 push_deferring_access_checks (dk_no_check);
5673 fcall = build_cleanup (decl);
5674 pop_deferring_access_checks ();
5676 /* Create the body of the anonymous function. */
5677 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5678 finish_expr_stmt (fcall);
5679 finish_compound_stmt (compound_stmt);
5683 /* Call atexit with the cleanup function. */
5684 mark_used (cleanup);
5685 cleanup = build_address (cleanup);
5686 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5692 /* We must convert CLEANUP to the type that "__cxa_atexit"
5694 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5695 /* "__cxa_atexit" will pass the address of DECL to the
5696 cleanup function. */
5698 addr = build_address (decl);
5699 /* The declared type of the parameter to "__cxa_atexit" is
5700 "void *". For plain "T*", we could just let the
5701 machinery in build_function_call convert it -- but if the
5702 type is "cv-qualified T *", then we need to convert it
5703 before passing it in, to avoid spurious errors. */
5704 addr = build_nop (ptr_type_node, addr);
5707 /* Since the cleanup functions we build ignore the address
5708 they're given, there's no reason to pass the actual address
5709 in, and, in general, it's cheaper to pass NULL than any
5711 addr = null_pointer_node;
5712 args = tree_cons (NULL_TREE,
5713 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5715 if (targetm.cxx.use_aeabi_atexit ())
5717 args = tree_cons (NULL_TREE, cleanup, args);
5718 args = tree_cons (NULL_TREE, addr, args);
5722 args = tree_cons (NULL_TREE, addr, args);
5723 args = tree_cons (NULL_TREE, cleanup, args);
5727 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5728 return build_function_call (get_atexit_node (), args);
5731 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5732 is its initializer. Generate code to handle the construction
5733 and destruction of DECL. */
5736 expand_static_init (tree decl, tree init)
5738 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5739 gcc_assert (TREE_STATIC (decl));
5741 /* Some variables require no initialization. */
5743 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5744 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5747 if (DECL_FUNCTION_SCOPE_P (decl))
5749 /* Emit code to perform this initialization but once. */
5750 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5751 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5752 tree guard, guard_addr;
5753 tree acquire_fn, release_fn, abort_fn;
5756 /* Emit code to perform this initialization but once. This code
5759 static <type> guard;
5760 if (!guard.first_byte) {
5761 if (__cxa_guard_acquire (&guard)) {
5764 // Do initialization.
5765 flag = true; __cxa_guard_release (&guard);
5766 // Register variable for destruction at end of program.
5768 if (!flag) __cxa_guard_abort (&guard);
5772 Note that the `flag' variable is only set to 1 *after* the
5773 initialization is complete. This ensures that an exception,
5774 thrown during the construction, will cause the variable to
5775 reinitialized when we pass through this code again, as per:
5779 If the initialization exits by throwing an exception, the
5780 initialization is not complete, so it will be tried again
5781 the next time control enters the declaration.
5783 This process should be thread-safe, too; multiple threads
5784 should not be able to initialize the variable more than
5787 /* Create the guard variable. */
5788 guard = get_guard (decl);
5790 /* This optimization isn't safe on targets with relaxed memory
5791 consistency. On such targets we force synchronization in
5792 __cxa_guard_acquire. */
5793 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5795 /* Begin the conditional initialization. */
5796 if_stmt = begin_if_stmt ();
5797 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5798 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5801 if (flag_threadsafe_statics)
5803 guard_addr = build_address (guard);
5805 acquire_fn = get_identifier ("__cxa_guard_acquire");
5806 release_fn = get_identifier ("__cxa_guard_release");
5807 abort_fn = get_identifier ("__cxa_guard_abort");
5808 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5810 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5812 tree vfntype = build_function_type (void_type_node, argtypes);
5813 acquire_fn = push_library_fn
5814 (acquire_fn, build_function_type (integer_type_node, argtypes));
5815 release_fn = push_library_fn (release_fn, vfntype);
5816 abort_fn = push_library_fn (abort_fn, vfntype);
5820 release_fn = identifier_global_value (release_fn);
5821 abort_fn = identifier_global_value (abort_fn);
5824 inner_if_stmt = begin_if_stmt ();
5825 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
5828 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5829 begin = get_target_expr (boolean_false_node);
5830 flag = TARGET_EXPR_SLOT (begin);
5832 TARGET_EXPR_CLEANUP (begin)
5833 = build3 (COND_EXPR, void_type_node, flag,
5835 build_call_n (abort_fn, 1, guard_addr));
5836 CLEANUP_EH_ONLY (begin) = 1;
5838 /* Do the initialization itself. */
5839 init = add_stmt_to_compound (begin, init);
5840 init = add_stmt_to_compound
5841 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5842 init = add_stmt_to_compound
5843 (init, build_call_n (release_fn, 1, guard_addr));
5846 init = add_stmt_to_compound (init, set_guard (guard));
5848 /* Use atexit to register a function for destroying this static
5850 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5852 finish_expr_stmt (init);
5854 if (flag_threadsafe_statics)
5856 finish_compound_stmt (inner_then_clause);
5857 finish_then_clause (inner_if_stmt);
5858 finish_if_stmt (inner_if_stmt);
5861 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5863 finish_compound_stmt (then_clause);
5864 finish_then_clause (if_stmt);
5865 finish_if_stmt (if_stmt);
5869 static_aggregates = tree_cons (init, decl, static_aggregates);
5873 /* Make TYPE a complete type based on INITIAL_VALUE.
5874 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5875 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5876 3 if the initializer list is empty (in pedantic mode). */
5879 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5882 tree type, elt_type;
5886 /* An array of character type can be initialized from a
5887 brace-enclosed string constant.
5889 FIXME: this code is duplicated from reshape_init. Probably
5890 we should just call reshape_init here? */
5891 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5892 && TREE_CODE (initial_value) == CONSTRUCTOR
5893 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5895 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5896 tree value = VEC_index (constructor_elt, v, 0)->value;
5898 if (TREE_CODE (value) == STRING_CST
5899 && VEC_length (constructor_elt, v) == 1)
5900 initial_value = value;
5904 failure = complete_array_type (ptype, initial_value, do_default);
5906 /* We can create the array before the element type is complete, which
5907 means that we didn't have these two bits set in the original type
5908 either. In completing the type, we are expected to propagate these
5909 bits. See also complete_type which does the same thing for arrays
5912 if (TYPE_DOMAIN (type))
5914 elt_type = TREE_TYPE (type);
5915 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5916 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5917 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5923 /* Return zero if something is declared to be a member of type
5924 CTYPE when in the context of CUR_TYPE. STRING is the error
5925 message to print in that case. Otherwise, quietly return 1. */
5928 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5930 if (ctype && ctype != cur_type)
5932 if (flags == DTOR_FLAG)
5933 error ("destructor for alien class %qT cannot be a member", ctype);
5935 error ("constructor for alien class %qT cannot be a member", ctype);
5941 /* Subroutine of `grokdeclarator'. */
5943 /* Generate errors possibly applicable for a given set of specifiers.
5944 This is for ARM $7.1.2. */
5947 bad_specifiers (tree object,
5956 error ("%qD declared as a %<virtual%> %s", object, type);
5958 error ("%qD declared as an %<inline%> %s", object, type);
5960 error ("%<const%> and %<volatile%> function specifiers on "
5961 "%qD invalid in %s declaration",
5964 error ("%q+D declared as a friend", object);
5966 && (TREE_CODE (object) == TYPE_DECL
5967 || (!TYPE_PTRFN_P (TREE_TYPE (object))
5968 && !TYPE_REFFN_P (TREE_TYPE (object))
5969 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
5970 error ("%q+D declared with an exception specification", object);
5973 /* DECL is a member function or static data member and is presently
5974 being defined. Check that the definition is taking place in a
5978 check_class_member_definition_namespace (tree decl)
5980 /* These checks only apply to member functions and static data
5982 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
5983 || TREE_CODE (decl) == VAR_DECL);
5984 /* We check for problems with specializations in pt.c in
5985 check_specialization_namespace, where we can issue better
5987 if (processing_specialization)
5989 /* There are no restrictions on the placement of
5990 explicit instantiations. */
5991 if (processing_explicit_instantiation)
5995 A member function definition that appears outside of the
5996 class definition shall appear in a namespace scope enclosing
5997 the class definition.
6001 The definition for a static data member shall appear in a
6002 namespace scope enclosing the member's class definition. */
6003 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6004 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6005 decl, DECL_CONTEXT (decl));
6008 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6009 METHOD_TYPE for a non-static member function; QUALS are the
6010 cv-qualifiers that apply to the function. */
6013 build_this_parm (tree type, cp_cv_quals quals)
6018 cp_cv_quals this_quals;
6020 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6021 /* The `this' parameter is implicitly `const'; it cannot be
6023 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6024 qual_type = cp_build_qualified_type (this_type, this_quals);
6025 parm = build_artificial_parm (this_identifier, qual_type);
6026 cp_apply_type_quals_to_decl (this_quals, parm);
6030 /* CTYPE is class type, or null if non-class.
6031 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6033 DECLARATOR is the function's name.
6034 PARMS is a chain of PARM_DECLs for the function.
6035 VIRTUALP is truthvalue of whether the function is virtual or not.
6036 FLAGS are to be passed through to `grokclassfn'.
6037 QUALS are qualifiers indicating whether the function is `const'
6039 RAISES is a list of exceptions that this function can raise.
6040 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6041 not look, and -1 if we should not call `grokclassfn' at all.
6043 SFK is the kind of special function (if any) for the new function.
6045 Returns `NULL_TREE' if something goes wrong, after issuing
6046 applicable error messages. */
6049 grokfndecl (tree ctype,
6053 tree orig_declarator,
6055 enum overload_flags flags,
6062 special_function_kind sfk,
6069 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6073 type = build_exception_variant (type, raises);
6075 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6076 if (TREE_CODE (type) == METHOD_TYPE)
6079 parm = build_this_parm (type, quals);
6080 TREE_CHAIN (parm) = parms;
6083 DECL_ARGUMENTS (decl) = parms;
6084 /* Propagate volatile out from type to decl. */
6085 if (TYPE_VOLATILE (type))
6086 TREE_THIS_VOLATILE (decl) = 1;
6088 /* Setup decl according to sfk. */
6091 case sfk_constructor:
6092 case sfk_copy_constructor:
6093 DECL_CONSTRUCTOR_P (decl) = 1;
6095 case sfk_destructor:
6096 DECL_DESTRUCTOR_P (decl) = 1;
6103 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6107 ("defining explicit specialization %qD in friend declaration",
6111 tree fns = TREE_OPERAND (orig_declarator, 0);
6112 tree args = TREE_OPERAND (orig_declarator, 1);
6114 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6116 /* Something like `template <class T> friend void f<T>()'. */
6117 error ("invalid use of template-id %qD in declaration "
6118 "of primary template",
6124 /* A friend declaration of the form friend void f<>(). Record
6125 the information in the TEMPLATE_ID_EXPR. */
6126 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6128 if (TREE_CODE (fns) == COMPONENT_REF)
6130 /* Due to bison parser ickiness, we will have already looked
6131 up an operator_name or PFUNCNAME within the current class
6132 (see template_id in parse.y). If the current class contains
6133 such a name, we'll get a COMPONENT_REF here. Undo that. */
6135 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6136 == current_class_type);
6137 fns = TREE_OPERAND (fns, 1);
6139 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6140 || TREE_CODE (fns) == OVERLOAD);
6141 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6143 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6144 if (TREE_PURPOSE (t)
6145 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6147 error ("default arguments are not allowed in declaration "
6148 "of friend template specialization %qD",
6155 error ("%<inline%> is not allowed in declaration of friend "
6156 "template specialization %qD",
6163 /* If this decl has namespace scope, set that up. */
6165 set_decl_namespace (decl, in_namespace, friendp);
6167 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6169 /* `main' and builtins have implicit 'C' linkage. */
6170 if ((MAIN_NAME_P (declarator)
6171 || (IDENTIFIER_LENGTH (declarator) > 10
6172 && IDENTIFIER_POINTER (declarator)[0] == '_'
6173 && IDENTIFIER_POINTER (declarator)[1] == '_'
6174 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6175 && current_lang_name == lang_name_cplusplus
6176 && ctype == NULL_TREE
6177 /* NULL_TREE means global namespace. */
6178 && DECL_CONTEXT (decl) == NULL_TREE)
6179 SET_DECL_LANGUAGE (decl, lang_c);
6181 /* Should probably propagate const out from type to decl I bet (mrs). */
6184 DECL_STATIC_FUNCTION_P (decl) = 1;
6185 DECL_CONTEXT (decl) = ctype;
6190 DECL_CONTEXT (decl) = ctype;
6192 check_class_member_definition_namespace (decl);
6195 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6197 if (processing_template_decl)
6198 error ("cannot declare %<::main%> to be a template");
6200 error ("cannot declare %<::main%> to be inline");
6202 error ("cannot declare %<::main%> to be static");
6207 /* Members of anonymous types and local classes have no linkage; make
6208 them internal. If a typedef is made later, this will be changed. */
6209 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6210 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6215 /* [basic.link]: A name with no linkage (notably, the name of a class
6216 or enumeration declared in a local scope) shall not be used to
6217 declare an entity with linkage.
6219 Only check this for public decls for now. See core 319, 389. */
6220 t = no_linkage_check (TREE_TYPE (decl),
6221 /*relaxed_p=*/false);
6224 if (TYPE_ANONYMOUS_P (t))
6226 if (DECL_EXTERN_C_P (decl))
6227 /* Allow this; it's pretty common in C. */;
6230 pedwarn ("non-local function %q#D uses anonymous type",
6232 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6233 pedwarn ("%q+#D does not refer to the unqualified "
6234 "type, so it is not used for linkage",
6239 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6243 TREE_PUBLIC (decl) = publicp;
6246 DECL_INTERFACE_KNOWN (decl) = 1;
6247 DECL_NOT_REALLY_EXTERN (decl) = 1;
6250 /* If the declaration was declared inline, mark it as such. */
6252 DECL_DECLARED_INLINE_P (decl) = 1;
6253 /* We inline functions that are explicitly declared inline, or, when
6254 the user explicitly asks us to, all functions. */
6255 if (DECL_DECLARED_INLINE_P (decl)
6256 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6257 DECL_INLINE (decl) = 1;
6259 DECL_EXTERNAL (decl) = 1;
6260 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6263 ? G_("static member function %qD cannot have cv-qualifier")
6264 : G_("non-member function %qD cannot have cv-qualifier"),
6266 quals = TYPE_UNQUALIFIED;
6269 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6270 && !grok_op_properties (decl, /*complain=*/true))
6273 if (ctype && decl_function_context (decl))
6274 DECL_NO_STATIC_CHAIN (decl) = 1;
6277 /* Make the init_value nonzero so pushdecl knows this is not
6278 tentative. error_mark_node is replaced later with the BLOCK. */
6279 DECL_INITIAL (decl) = error_mark_node;
6281 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6282 TREE_NOTHROW (decl) = 1;
6284 /* Caller will do the rest of this. */
6288 if (ctype != NULL_TREE)
6289 grokclassfn (ctype, decl, flags);
6291 decl = check_explicit_specialization (orig_declarator, decl,
6294 4 * (friendp != 0));
6295 if (decl == error_mark_node)
6300 cplus_decl_attributes (&decl, *attrlist, 0);
6301 *attrlist = NULL_TREE;
6304 /* Check main's type after attributes have been applied. */
6305 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6307 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6310 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6312 error ("%<::main%> must return %<int%>");
6313 newtype = build_function_type (integer_type_node, oldtypeargs);
6314 TREE_TYPE (decl) = newtype;
6316 check_main_parameter_types (decl);
6319 if (ctype != NULL_TREE
6320 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6325 old_decl = check_classfn (ctype, decl,
6326 (processing_template_decl
6327 > template_class_depth (ctype))
6328 ? current_template_parms
6335 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6336 /* Because grokfndecl is always supposed to return a
6337 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6338 here. We depend on our callers to figure out that its
6339 really a template that's being returned. */
6340 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6342 if (DECL_STATIC_FUNCTION_P (old_decl)
6343 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6344 /* Remove the `this' parm added by grokclassfn.
6345 XXX Isn't this done in start_function, too? */
6346 revert_static_member_fn (decl);
6347 if (DECL_ARTIFICIAL (old_decl))
6348 error ("definition of implicitly-declared %qD", old_decl);
6350 /* Since we've smashed OLD_DECL to its
6351 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6352 if (TREE_CODE (decl) == TEMPLATE_DECL)
6353 decl = DECL_TEMPLATE_RESULT (decl);
6355 /* Attempt to merge the declarations. This can fail, in
6356 the case of some invalid specialization declarations. */
6357 pushed_scope = push_scope (ctype);
6358 ok = duplicate_decls (decl, old_decl, friendp);
6360 pop_scope (pushed_scope);
6363 error ("no %q#D member function declared in class %qT",
6371 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6374 if (ctype == NULL_TREE || check)
6378 DECL_VIRTUAL_P (decl) = 1;
6383 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6384 the linkage that DECL will receive in the object file. */
6387 set_linkage_for_static_data_member (tree decl)
6389 /* A static data member always has static storage duration and
6390 external linkage. Note that static data members are forbidden in
6391 local classes -- the only situation in which a class has
6392 non-external linkage. */
6393 TREE_PUBLIC (decl) = 1;
6394 TREE_STATIC (decl) = 1;
6395 /* For non-template classes, static data members are always put
6396 out in exactly those files where they are defined, just as
6397 with ordinary namespace-scope variables. */
6398 if (!processing_template_decl)
6399 DECL_INTERFACE_KNOWN (decl) = 1;
6402 /* Create a VAR_DECL named NAME with the indicated TYPE.
6404 If SCOPE is non-NULL, it is the class type or namespace containing
6405 the variable. If SCOPE is NULL, the variable should is created in
6406 the innermost enclosings scope. */
6409 grokvardecl (tree type,
6411 const cp_decl_specifier_seq *declspecs,
6417 tree explicit_scope;
6419 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6421 /* Compute the scope in which to place the variable, but remember
6422 whether or not that scope was explicitly specified by the user. */
6423 explicit_scope = scope;
6426 /* An explicit "extern" specifier indicates a namespace-scope
6428 if (declspecs->storage_class == sc_extern)
6429 scope = current_namespace;
6430 else if (!at_function_scope_p ())
6431 scope = current_scope ();
6435 && (/* If the variable is a namespace-scope variable declared in a
6436 template, we need DECL_LANG_SPECIFIC. */
6437 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6438 /* Similarly for namespace-scope variables with language linkage
6440 || (TREE_CODE (scope) == NAMESPACE_DECL
6441 && current_lang_name != lang_name_cplusplus)
6442 /* Similarly for static data members. */
6444 decl = build_lang_decl (VAR_DECL, name, type);
6446 decl = build_decl (VAR_DECL, name, type);
6448 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6449 set_decl_namespace (decl, explicit_scope, 0);
6451 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6453 if (declspecs->storage_class == sc_extern)
6455 DECL_THIS_EXTERN (decl) = 1;
6456 DECL_EXTERNAL (decl) = !initialized;
6459 if (DECL_CLASS_SCOPE_P (decl))
6461 set_linkage_for_static_data_member (decl);
6462 /* This function is only called with out-of-class definitions. */
6463 DECL_EXTERNAL (decl) = 0;
6464 check_class_member_definition_namespace (decl);
6466 /* At top level, either `static' or no s.c. makes a definition
6467 (perhaps tentative), and absence of `static' makes it public. */
6468 else if (toplevel_bindings_p ())
6470 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6471 && (DECL_THIS_EXTERN (decl) || ! constp));
6472 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6474 /* Not at top level, only `static' makes a static definition. */
6477 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6478 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6481 if (declspecs->specs[(int)ds_thread])
6482 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6484 if (TREE_PUBLIC (decl))
6486 /* [basic.link]: A name with no linkage (notably, the name of a class
6487 or enumeration declared in a local scope) shall not be used to
6488 declare an entity with linkage.
6490 Only check this for public decls for now. */
6491 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6494 if (TYPE_ANONYMOUS_P (t))
6496 if (DECL_EXTERN_C_P (decl))
6497 /* Allow this; it's pretty common in C. */
6501 /* DRs 132, 319 and 389 seem to indicate types with
6502 no linkage can only be used to declare extern "C"
6503 entities. Since it's not always an error in the
6504 ISO C++ 90 Standard, we only issue a warning. */
6505 warning (0, "non-local variable %q#D uses anonymous type",
6507 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6508 warning (0, "%q+#D does not refer to the unqualified "
6509 "type, so it is not used for linkage",
6514 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6518 DECL_INTERFACE_KNOWN (decl) = 1;
6523 /* Create and return a canonical pointer to member function type, for
6524 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6527 build_ptrmemfunc_type (tree type)
6531 tree unqualified_variant = NULL_TREE;
6533 if (type == error_mark_node)
6536 /* If a canonical type already exists for this type, use it. We use
6537 this method instead of type_hash_canon, because it only does a
6538 simple equality check on the list of field members. */
6540 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6543 /* Make sure that we always have the unqualified pointer-to-member
6545 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6547 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6549 t = make_aggr_type (RECORD_TYPE);
6550 xref_basetypes (t, NULL_TREE);
6552 /* Let the front end know this is a pointer to member function... */
6553 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6554 /* ... and not really an aggregate. */
6555 SET_IS_AGGR_TYPE (t, 0);
6557 field = build_decl (FIELD_DECL, pfn_identifier, type);
6560 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6561 TREE_CHAIN (field) = fields;
6564 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6566 /* Zap out the name so that the back end will give us the debugging
6567 information for this anonymous RECORD_TYPE. */
6568 TYPE_NAME (t) = NULL_TREE;
6570 /* If this is not the unqualified form of this pointer-to-member
6571 type, set the TYPE_MAIN_VARIANT for this type to be the
6572 unqualified type. Since they are actually RECORD_TYPEs that are
6573 not variants of each other, we must do this manually. */
6574 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6576 t = build_qualified_type (t, cp_type_quals (type));
6577 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6578 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6579 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6582 /* Cache this pointer-to-member type so that we can find it again
6584 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6586 if (TYPE_STRUCTURAL_EQUALITY_P (type))
6587 SET_TYPE_STRUCTURAL_EQUALITY (t);
6588 else if (TYPE_CANONICAL (type) != type)
6589 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
6594 /* Create and return a pointer to data member type. */
6597 build_ptrmem_type (tree class_type, tree member_type)
6599 if (TREE_CODE (member_type) == METHOD_TYPE)
6603 arg_types = TYPE_ARG_TYPES (member_type);
6604 class_type = (cp_build_qualified_type
6606 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6608 = build_method_type_directly (class_type,
6609 TREE_TYPE (member_type),
6610 TREE_CHAIN (arg_types));
6611 return build_ptrmemfunc_type (build_pointer_type (member_type));
6615 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6616 return build_offset_type (class_type, member_type);
6620 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6621 Check to see that the definition is valid. Issue appropriate error
6622 messages. Return 1 if the definition is particularly bad, or 0
6626 check_static_variable_definition (tree decl, tree type)
6628 /* Motion 10 at San Diego: If a static const integral data member is
6629 initialized with an integral constant expression, the initializer
6630 may appear either in the declaration (within the class), or in
6631 the definition, but not both. If it appears in the class, the
6632 member is a member constant. The file-scope definition is always
6634 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6636 error ("invalid in-class initialization of static data member "
6637 "of non-integral type %qT",
6639 /* If we just return the declaration, crashes will sometimes
6640 occur. We therefore return void_type_node, as if this were a
6641 friend declaration, to cause callers to completely ignore
6642 this declaration. */
6645 else if (!CP_TYPE_CONST_P (type))
6646 error ("ISO C++ forbids in-class initialization of non-const "
6647 "static member %qD",
6649 else if (pedantic && !INTEGRAL_TYPE_P (type))
6650 pedwarn ("ISO C++ forbids initialization of member constant "
6651 "%qD of non-integral type %qT", decl, type);
6656 /* Given the SIZE (i.e., number of elements) in an array, compute an
6657 appropriate index type for the array. If non-NULL, NAME is the
6658 name of the thing being declared. */
6661 compute_array_index_type (tree name, tree size)
6665 tree abi_1_itype = NULL_TREE;
6667 if (error_operand_p (size))
6668 return error_mark_node;
6670 type = TREE_TYPE (size);
6671 /* The array bound must be an integer type. */
6672 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6675 error ("size of array %qD has non-integral type %qT", name, type);
6677 error ("size of array has non-integral type %qT", type);
6678 size = integer_one_node;
6679 type = TREE_TYPE (size);
6682 if (value_dependent_expression_p (size))
6684 /* We cannot do any checking for a value-dependent SIZE. Just
6685 build the index type and mark that it requires structural
6687 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6688 size, integer_one_node));
6689 SET_TYPE_STRUCTURAL_EQUALITY (itype);
6693 if (!abi_version_at_least (2) && processing_template_decl)
6694 /* For abi-1, we handled all instances in templates the same way,
6695 even when they were non-dependent. This effects the manglings
6696 produced. So, we do the normal checking for non-dependent
6697 sizes, but at the end we'll return the same type that abi-1
6698 would have, but with TYPE_CANONICAL set to the "right"
6699 value that the current ABI would provide. */
6700 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6701 size, integer_one_node));
6703 /* The size might be the result of a cast. */
6704 STRIP_TYPE_NOPS (size);
6706 /* It might be a const variable or enumeration constant. */
6707 size = integral_constant_value (size);
6709 /* Normally, the array-bound will be a constant. */
6710 if (TREE_CODE (size) == INTEGER_CST)
6712 /* Check to see if the array bound overflowed. Make that an
6713 error, no matter how generous we're being. */
6714 int old_flag_pedantic_errors = flag_pedantic_errors;
6715 int old_pedantic = pedantic;
6716 pedantic = flag_pedantic_errors = 1;
6717 constant_expression_warning (size);
6718 pedantic = old_pedantic;
6719 flag_pedantic_errors = old_flag_pedantic_errors;
6721 /* An array must have a positive number of elements. */
6722 if (INT_CST_LT (size, integer_zero_node))
6725 error ("size of array %qD is negative", name);
6727 error ("size of array is negative");
6728 size = integer_one_node;
6730 /* As an extension we allow zero-sized arrays. We always allow
6731 them in system headers because glibc uses them. */
6732 else if (integer_zerop (size) && pedantic && !in_system_header)
6735 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6737 pedwarn ("ISO C++ forbids zero-size array");
6740 else if (TREE_CONSTANT (size))
6742 /* `(int) &fn' is not a valid array bound. */
6744 error ("size of array %qD is not an integral constant-expression",
6747 error ("size of array is not an integral constant-expression");
6748 size = integer_one_node;
6750 else if (pedantic && warn_vla != 0)
6753 pedwarn ("ISO C++ forbids variable length array %qD", name);
6755 pedwarn ("ISO C++ forbids variable length array");
6757 else if (warn_vla > 0)
6761 "variable length array %qD is used", name);
6764 "variable length array is used");
6767 if (processing_template_decl && !TREE_CONSTANT (size))
6768 /* A variable sized array. */
6769 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6772 HOST_WIDE_INT saved_processing_template_decl;
6774 /* Compute the index of the largest element in the array. It is
6775 one less than the number of elements in the array. We save
6776 and restore PROCESSING_TEMPLATE_DECL so that computations in
6777 cp_build_binary_op will be appropriately folded. */
6778 saved_processing_template_decl = processing_template_decl;
6779 processing_template_decl = 0;
6780 itype = cp_build_binary_op (MINUS_EXPR,
6781 cp_convert (ssizetype, size),
6782 cp_convert (ssizetype, integer_one_node));
6783 itype = fold (itype);
6784 processing_template_decl = saved_processing_template_decl;
6786 if (!TREE_CONSTANT (itype))
6787 /* A variable sized array. */
6788 itype = variable_size (itype);
6789 /* Make sure that there was no overflow when creating to a signed
6790 index type. (For example, on a 32-bit machine, an array with
6791 size 2^32 - 1 is too big.) */
6792 else if (TREE_CODE (itype) == INTEGER_CST
6793 && TREE_OVERFLOW (itype))
6795 error ("overflow in array dimension");
6796 TREE_OVERFLOW (itype) = 0;
6800 /* Create and return the appropriate index type. */
6803 tree t = build_index_type (itype);
6804 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
6808 return build_index_type (itype);
6811 /* Returns the scope (if any) in which the entity declared by
6812 DECLARATOR will be located. If the entity was declared with an
6813 unqualified name, NULL_TREE is returned. */
6816 get_scope_of_declarator (const cp_declarator *declarator)
6818 while (declarator && declarator->kind != cdk_id)
6819 declarator = declarator->declarator;
6821 /* If the declarator-id is a SCOPE_REF, the scope in which the
6822 declaration occurs is the first operand. */
6824 && declarator->u.id.qualifying_scope)
6825 return declarator->u.id.qualifying_scope;
6827 /* Otherwise, the declarator is not a qualified name; the entity will
6828 be declared in the current scope. */
6832 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6833 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6837 create_array_type_for_decl (tree name, tree type, tree size)
6839 tree itype = NULL_TREE;
6840 const char* error_msg;
6842 /* If things have already gone awry, bail now. */
6843 if (type == error_mark_node || size == error_mark_node)
6844 return error_mark_node;
6846 /* Assume that everything will go OK. */
6849 /* There are some types which cannot be array elements. */
6850 switch (TREE_CODE (type))
6853 error_msg = "array of void";
6857 error_msg = "array of functions";
6860 case REFERENCE_TYPE:
6861 error_msg = "array of references";
6865 error_msg = "array of function members";
6872 /* If something went wrong, issue an error-message and return. */
6876 error ("declaration of %qD as %s", name, error_msg);
6878 error ("creating %s", error_msg);
6880 return error_mark_node;
6885 The constant expressions that specify the bounds of the arrays
6886 can be omitted only for the first member of the sequence. */
6887 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6890 error ("declaration of %qD as multidimensional array must "
6891 "have bounds for all dimensions except the first",
6894 error ("multidimensional array must have bounds for all "
6895 "dimensions except the first");
6897 return error_mark_node;
6900 /* Figure out the index type for the array. */
6902 itype = compute_array_index_type (name, size);
6905 T is called the array element type; this type shall not be [...] an
6906 abstract class type. */
6907 abstract_virtuals_error (name, type);
6909 return build_cplus_array_type (type, itype);
6912 /* Check that it's OK to declare a function with the indicated TYPE.
6913 SFK indicates the kind of special function (if any) that this
6914 function is. OPTYPE is the type given in a conversion operator
6915 declaration, or the class type for a constructor/destructor.
6916 Returns the actual return type of the function; that
6917 may be different than TYPE if an error occurs, or for certain
6918 special functions. */
6921 check_special_function_return_type (special_function_kind sfk,
6927 case sfk_constructor:
6929 error ("return type specification for constructor invalid");
6931 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6932 type = build_pointer_type (optype);
6934 type = void_type_node;
6937 case sfk_destructor:
6939 error ("return type specification for destructor invalid");
6940 /* We can't use the proper return type here because we run into
6941 problems with ambiguous bases and covariant returns.
6942 Java classes are left unchanged because (void *) isn't a valid
6943 Java type, and we don't want to change the Java ABI. */
6944 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6945 type = build_pointer_type (void_type_node);
6947 type = void_type_node;
6950 case sfk_conversion:
6951 if (type && !same_type_p (type, optype))
6952 error ("operator %qT declared to return %qT", optype, type);
6954 pedwarn ("return type specified for %<operator %T%>", optype);
6965 /* A variable or data member (whose unqualified name is IDENTIFIER)
6966 has been declared with the indicated TYPE. If the TYPE is not
6967 acceptable, issue an error message and return a type to use for
6968 error-recovery purposes. */
6971 check_var_type (tree identifier, tree type)
6973 if (VOID_TYPE_P (type))
6976 error ("unnamed variable or field declared void");
6977 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
6979 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
6980 error ("variable or field %qE declared void", identifier);
6983 error ("variable or field declared void");
6984 type = error_mark_node;
6990 /* Given declspecs and a declarator (abstract or otherwise), determine
6991 the name and type of the object declared and construct a DECL node
6994 DECLSPECS points to the representation of declaration-specifier
6995 sequence that precedes declarator.
6997 DECL_CONTEXT says which syntactic context this declaration is in:
6998 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6999 FUNCDEF for a function definition. Like NORMAL but a few different
7000 error messages in each case. Return value may be zero meaning
7001 this definition is too screwy to try to parse.
7002 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7003 handle member functions (which have FIELD context).
7004 Return value may be zero meaning this definition is too screwy to
7006 PARM for a parameter declaration (either within a function prototype
7007 or before a function body). Make a PARM_DECL, or return void_type_node.
7008 CATCHPARM for a parameter declaration before a catch clause.
7009 TYPENAME if for a typename (in a cast or sizeof).
7010 Don't make a DECL node; just return the ..._TYPE node.
7011 FIELD for a struct or union field; make a FIELD_DECL.
7012 BITFIELD for a field with specified width.
7013 INITIALIZED is 1 if the decl has an initializer.
7015 ATTRLIST is a pointer to the list of attributes, which may be NULL
7016 if there are none; *ATTRLIST may be modified if attributes from inside
7017 the declarator should be applied to the declaration.
7019 When this function is called, scoping variables (such as
7020 CURRENT_CLASS_TYPE) should reflect the scope in which the
7021 declaration occurs, not the scope in which the new declaration will
7022 be placed. For example, on:
7026 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7029 Returns a DECL (if a declarator is present), a TYPE (if there is no
7030 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7034 grokdeclarator (const cp_declarator *declarator,
7035 const cp_decl_specifier_seq *declspecs,
7036 enum decl_context decl_context,
7040 tree type = NULL_TREE;
7042 int virtualp, explicitp, friendp, inlinep, staticp;
7043 int explicit_int = 0;
7044 int explicit_char = 0;
7045 int defaulted_int = 0;
7046 tree dependent_name = NULL_TREE;
7048 tree typedef_decl = NULL_TREE;
7049 const char *name = NULL;
7050 tree typedef_type = NULL_TREE;
7051 /* True if this declarator is a function definition. */
7052 bool funcdef_flag = false;
7053 cp_declarator_kind innermost_code = cdk_error;
7056 /* See the code below that used this. */
7057 tree decl_attr = NULL_TREE;
7060 /* Keep track of what sort of function is being processed
7061 so that we can warn about default return values, or explicit
7062 return values which do not match prescribed defaults. */
7063 special_function_kind sfk = sfk_none;
7065 tree dname = NULL_TREE;
7066 tree ctor_return_type = NULL_TREE;
7067 enum overload_flags flags = NO_SPECIAL;
7068 /* cv-qualifiers that apply to the declarator, for a declaration of
7069 a member function. */
7070 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7071 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7073 tree raises = NULL_TREE;
7074 int template_count = 0;
7075 tree returned_attrs = NULL_TREE;
7076 tree parms = NULL_TREE;
7077 const cp_declarator *id_declarator;
7078 /* The unqualified name of the declarator; either an
7079 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7080 tree unqualified_id;
7081 /* The class type, if any, in which this entity is located,
7082 or NULL_TREE if none. Note that this value may be different from
7083 the current class type; for example if an attempt is made to declare
7084 "A::f" inside "B", this value will be "A". */
7085 tree ctype = current_class_type;
7086 /* The NAMESPACE_DECL for the namespace in which this entity is
7087 located. If an unqualified name is used to declare the entity,
7088 this value will be NULL_TREE, even if the entity is located at
7090 tree in_namespace = NULL_TREE;
7091 cp_storage_class storage_class;
7092 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7093 bool type_was_error_mark_node = false;
7094 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7095 bool set_no_warning = false;
7097 signed_p = declspecs->specs[(int)ds_signed];
7098 unsigned_p = declspecs->specs[(int)ds_unsigned];
7099 short_p = declspecs->specs[(int)ds_short];
7100 long_p = declspecs->specs[(int)ds_long];
7101 longlong = declspecs->specs[(int)ds_long] >= 2;
7102 thread_p = declspecs->specs[(int)ds_thread];
7104 if (decl_context == FUNCDEF)
7105 funcdef_flag = true, decl_context = NORMAL;
7106 else if (decl_context == MEMFUNCDEF)
7107 funcdef_flag = true, decl_context = FIELD;
7108 else if (decl_context == BITFIELD)
7109 bitfield = 1, decl_context = FIELD;
7111 /* Look inside a declarator for the name being declared
7112 and get it as a string, for an error message. */
7113 for (id_declarator = declarator;
7115 id_declarator = id_declarator->declarator)
7117 if (id_declarator->kind != cdk_id)
7118 innermost_code = id_declarator->kind;
7120 switch (id_declarator->kind)
7123 if (id_declarator->declarator
7124 && id_declarator->declarator->kind == cdk_id)
7126 sfk = id_declarator->declarator->u.id.sfk;
7127 if (sfk == sfk_destructor)
7134 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7135 tree decl = id_declarator->u.id.unqualified_name;
7138 if (qualifying_scope)
7140 if (at_function_scope_p ())
7144 A declarator-id shall not be qualified except
7147 None of the cases are permitted in block
7149 if (qualifying_scope == global_namespace)
7150 error ("invalid use of qualified-name %<::%D%>",
7152 else if (TYPE_P (qualifying_scope))
7153 error ("invalid use of qualified-name %<%T::%D%>",
7154 qualifying_scope, decl);
7156 error ("invalid use of qualified-name %<%D::%D%>",
7157 qualifying_scope, decl);
7158 return error_mark_node;
7160 else if (TYPE_P (qualifying_scope))
7162 ctype = qualifying_scope;
7163 if (innermost_code != cdk_function
7164 && current_class_type
7165 && !UNIQUELY_DERIVED_FROM_P (ctype,
7166 current_class_type))
7168 error ("type %qT is not derived from type %qT",
7169 ctype, current_class_type);
7170 return error_mark_node;
7173 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7174 in_namespace = qualifying_scope;
7176 switch (TREE_CODE (decl))
7182 if (innermost_code != cdk_function)
7184 error ("declaration of %qD as non-function", decl);
7185 return error_mark_node;
7187 else if (!qualifying_scope
7188 && !(current_class_type && at_class_scope_p ()))
7190 error ("declaration of %qD as non-member", decl);
7191 return error_mark_node;
7194 type = TREE_OPERAND (decl, 0);
7195 name = IDENTIFIER_POINTER (constructor_name (type));
7200 case TEMPLATE_ID_EXPR:
7202 tree fns = TREE_OPERAND (decl, 0);
7205 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7207 gcc_assert (is_overloaded_fn (dname));
7208 dname = DECL_NAME (get_first_fn (dname));
7213 case IDENTIFIER_NODE:
7214 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7217 if (C_IS_RESERVED_WORD (dname))
7219 error ("declarator-id missing; using reserved word %qD",
7221 name = IDENTIFIER_POINTER (dname);
7223 else if (!IDENTIFIER_TYPENAME_P (dname))
7224 name = IDENTIFIER_POINTER (dname);
7227 gcc_assert (flags == NO_SPECIAL);
7228 flags = TYPENAME_FLAG;
7229 ctor_return_type = TREE_TYPE (dname);
7230 sfk = sfk_conversion;
7231 if (is_typename_at_global_scope (dname))
7232 name = IDENTIFIER_POINTER (dname);
7234 name = "<invalid operator>";
7251 return error_mark_node;
7256 if (id_declarator->kind == cdk_id)
7262 The declarator in a function-definition shall have the form
7263 D1 ( parameter-declaration-clause) ... */
7264 if (funcdef_flag && innermost_code != cdk_function)
7266 error ("function definition does not declare parameters");
7267 return error_mark_node;
7270 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7271 && innermost_code != cdk_function
7272 && ! (ctype && !declspecs->any_specifiers_p))
7274 error ("declaration of %qD as non-function", dname);
7275 return error_mark_node;
7278 /* Anything declared one level down from the top level
7279 must be one of the parameters of a function
7280 (because the body is at least two levels down). */
7282 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7283 by not allowing C++ class definitions to specify their parameters
7284 with xdecls (must be spec.d in the parmlist).
7286 Since we now wait to push a class scope until we are sure that
7287 we are in a legitimate method context, we must set oldcname
7288 explicitly (since current_class_name is not yet alive).
7290 We also want to avoid calling this a PARM if it is in a namespace. */
7292 if (decl_context == NORMAL && !toplevel_bindings_p ())
7294 struct cp_binding_level *b = current_binding_level;
7295 current_binding_level = b->level_chain;
7296 if (current_binding_level != 0 && toplevel_bindings_p ())
7297 decl_context = PARM;
7298 current_binding_level = b;
7302 name = decl_context == PARM ? "parameter" : "type name";
7304 /* If there were multiple types specified in the decl-specifier-seq,
7305 issue an error message. */
7306 if (declspecs->multiple_types_p)
7308 error ("two or more data types in declaration of %qs", name);
7309 return error_mark_node;
7312 /* Extract the basic type from the decl-specifier-seq. */
7313 type = declspecs->type;
7314 if (type == error_mark_node)
7317 type_was_error_mark_node = true;
7319 /* If the entire declaration is itself tagged as deprecated then
7320 suppress reports of deprecated items. */
7321 if (type && TREE_DEPRECATED (type)
7322 && deprecated_state != DEPRECATED_SUPPRESS)
7323 warn_deprecated_use (type);
7324 if (type && TREE_CODE (type) == TYPE_DECL)
7326 typedef_decl = type;
7327 type = TREE_TYPE (typedef_decl);
7329 /* No type at all: default to `int', and set DEFAULTED_INT
7330 because it was not a user-defined typedef. */
7331 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7333 /* These imply 'int'. */
7334 type = integer_type_node;
7338 explicit_int = declspecs->explicit_int_p;
7339 explicit_char = declspecs->explicit_char_p;
7342 /* See the code below that used this. */
7344 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7346 typedef_type = type;
7349 if (sfk != sfk_conversion)
7350 ctor_return_type = ctype;
7352 if (sfk != sfk_none)
7353 type = check_special_function_return_type (sfk, type,
7355 else if (type == NULL_TREE)
7361 /* We handle `main' specially here, because 'main () { }' is so
7362 common. With no options, it is allowed. With -Wreturn-type,
7363 it is a warning. It is only an error with -pedantic-errors. */
7364 is_main = (funcdef_flag
7365 && dname && MAIN_NAME_P (dname)
7366 && ctype == NULL_TREE
7367 && in_namespace == NULL_TREE
7368 && current_namespace == global_namespace);
7370 if (type_was_error_mark_node)
7371 /* We've already issued an error, don't complain more. */;
7372 else if (in_system_header || flag_ms_extensions)
7373 /* Allow it, sigh. */;
7374 else if (pedantic || ! is_main)
7375 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7377 warning (OPT_Wreturn_type,
7378 "ISO C++ forbids declaration of %qs with no type", name);
7380 type = integer_type_node;
7385 /* Now process the modifiers that were specified
7386 and check for invalid combinations. */
7388 /* Long double is a special combination. */
7389 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7392 type = build_qualified_type (long_double_type_node,
7393 cp_type_quals (type));
7396 /* Check all other uses of type modifiers. */
7398 if (unsigned_p || signed_p || long_p || short_p)
7402 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7403 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7404 else if (signed_p && unsigned_p)
7405 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7406 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7407 error ("%<long long%> invalid for %qs", name);
7408 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7409 error ("%<long%> invalid for %qs", name);
7410 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7411 error ("%<short%> invalid for %qs", name);
7412 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7413 error ("%<long%> or %<short%> invalid for %qs", name);
7414 else if ((long_p || short_p) && explicit_char)
7415 error ("%<long%> or %<short%> specified with char for %qs", name);
7416 else if (long_p && short_p)
7417 error ("%<long%> and %<short%> specified together for %qs", name);
7421 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7423 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7425 if (flag_pedantic_errors)
7430 /* Discard the type modifiers if they are invalid. */
7441 /* Decide whether an integer type is signed or not.
7442 Optionally treat bitfields as signed by default. */
7446 It is implementation-defined whether a plain (neither
7447 explicitly signed or unsigned) char, short, int, or long
7448 bit-field is signed or unsigned.
7450 Naturally, we extend this to long long as well. Note that
7451 this does not include wchar_t. */
7452 || (bitfield && !flag_signed_bitfields
7454 /* A typedef for plain `int' without `signed' can be
7455 controlled just like plain `int', but a typedef for
7456 `signed int' cannot be so controlled. */
7458 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7459 && TREE_CODE (type) == INTEGER_TYPE
7460 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7463 type = long_long_unsigned_type_node;
7465 type = long_unsigned_type_node;
7467 type = short_unsigned_type_node;
7468 else if (type == char_type_node)
7469 type = unsigned_char_type_node;
7470 else if (typedef_decl)
7471 type = unsigned_type_for (type);
7473 type = unsigned_type_node;
7475 else if (signed_p && type == char_type_node)
7476 type = signed_char_type_node;
7478 type = long_long_integer_type_node;
7480 type = long_integer_type_node;
7482 type = short_integer_type_node;
7484 if (declspecs->specs[(int)ds_complex])
7486 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7487 error ("complex invalid for %qs", name);
7488 /* If we just have "complex", it is equivalent to
7489 "complex double", but if any modifiers at all are specified it is
7490 the complex form of TYPE. E.g, "complex short" is
7491 "complex short int". */
7493 else if (defaulted_int && ! longlong
7494 && ! (long_p || short_p || signed_p || unsigned_p))
7495 type = complex_double_type_node;
7496 else if (type == integer_type_node)
7497 type = complex_integer_type_node;
7498 else if (type == float_type_node)
7499 type = complex_float_type_node;
7500 else if (type == double_type_node)
7501 type = complex_double_type_node;
7502 else if (type == long_double_type_node)
7503 type = complex_long_double_type_node;
7505 type = build_complex_type (type);
7508 type_quals = TYPE_UNQUALIFIED;
7509 if (declspecs->specs[(int)ds_const])
7510 type_quals |= TYPE_QUAL_CONST;
7511 if (declspecs->specs[(int)ds_volatile])
7512 type_quals |= TYPE_QUAL_VOLATILE;
7513 if (declspecs->specs[(int)ds_restrict])
7514 type_quals |= TYPE_QUAL_RESTRICT;
7515 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7516 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7519 if (TREE_CODE (type) == FUNCTION_TYPE
7520 && type_quals != TYPE_UNQUALIFIED)
7522 /* This was an error in C++98 (cv-qualifiers cannot be added to
7523 a function type), but DR 295 makes the code well-formed by
7524 dropping the extra qualifiers. */
7527 tree bad_type = build_qualified_type (type, type_quals);
7528 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7531 type_quals = TYPE_UNQUALIFIED;
7533 type_quals |= cp_type_quals (type);
7534 type = cp_build_qualified_type_real
7535 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7536 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7537 /* We might have ignored or rejected some of the qualifiers. */
7538 type_quals = cp_type_quals (type);
7541 inlinep = !! declspecs->specs[(int)ds_inline];
7542 virtualp = !! declspecs->specs[(int)ds_virtual];
7543 explicitp = !! declspecs->specs[(int)ds_explicit];
7545 storage_class = declspecs->storage_class;
7546 if (storage_class == sc_static)
7547 staticp = 1 + (decl_context == FIELD);
7549 if (virtualp && staticp == 2)
7551 error ("member %qD cannot be declared both virtual and static", dname);
7552 storage_class = sc_none;
7555 friendp = !! declspecs->specs[(int)ds_friend];
7557 if (dependent_name && !friendp)
7559 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7560 return error_mark_node;
7563 /* Issue errors about use of storage classes for parameters. */
7564 if (decl_context == PARM)
7566 if (declspecs->specs[(int)ds_typedef])
7568 error ("typedef declaration invalid in parameter declaration");
7569 return error_mark_node;
7571 else if (storage_class == sc_static
7572 || storage_class == sc_extern
7574 error ("storage class specifiers invalid in parameter declarations");
7577 /* Give error if `virtual' is used outside of class declaration. */
7579 && (current_class_name == NULL_TREE || decl_context != FIELD))
7581 error ("virtual outside class declaration");
7585 /* Static anonymous unions are dealt with here. */
7586 if (staticp && decl_context == TYPENAME
7588 && ANON_AGGR_TYPE_P (declspecs->type))
7589 decl_context = FIELD;
7591 /* Warn about storage classes that are invalid for certain
7592 kinds of declarations (parameters, typenames, etc.). */
7595 && storage_class != sc_extern
7596 && storage_class != sc_static)
7597 || declspecs->specs[(int)ds_typedef]))
7599 error ("multiple storage classes in declaration of %qs", name);
7602 if (declspecs->conflicting_specifiers_p)
7604 error ("conflicting specifiers in declaration of %qs", name);
7605 storage_class = sc_none;
7607 else if (decl_context != NORMAL
7608 && ((storage_class != sc_none
7609 && storage_class != sc_mutable)
7612 if ((decl_context == PARM || decl_context == CATCHPARM)
7613 && (storage_class == sc_register
7614 || storage_class == sc_auto))
7616 else if (declspecs->specs[(int)ds_typedef])
7618 else if (decl_context == FIELD
7619 /* C++ allows static class elements. */
7620 && storage_class == sc_static)
7621 /* C++ also allows inlines and signed and unsigned elements,
7622 but in those cases we don't come in here. */
7626 if (decl_context == FIELD)
7627 error ("storage class specified for %qs", name);
7630 if (decl_context == PARM || decl_context == CATCHPARM)
7631 error ("storage class specified for parameter %qs", name);
7633 error ("storage class specified for typename");
7635 if (storage_class == sc_register
7636 || storage_class == sc_auto
7637 || storage_class == sc_extern
7639 storage_class = sc_none;
7642 else if (storage_class == sc_extern && initialized
7645 if (toplevel_bindings_p ())
7647 /* It's common practice (and completely valid) to have a const
7648 be initialized and declared extern. */
7649 if (!(type_quals & TYPE_QUAL_CONST))
7650 warning (0, "%qs initialized and declared %<extern%>", name);
7653 error ("%qs has both %<extern%> and initializer", name);
7655 else if (storage_class == sc_extern && funcdef_flag
7656 && ! toplevel_bindings_p ())
7657 error ("nested function %qs declared %<extern%>", name);
7658 else if (toplevel_bindings_p ())
7660 if (storage_class == sc_auto)
7661 error ("top-level declaration of %qs specifies %<auto%>", name);
7664 && storage_class != sc_extern
7665 && storage_class != sc_static)
7667 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7672 if (storage_class && friendp)
7673 error ("storage class specifiers invalid in friend function declarations");
7676 unqualified_id = NULL_TREE;
7679 unqualified_id = id_declarator->u.id.unqualified_name;
7680 switch (TREE_CODE (unqualified_id))
7684 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7687 case IDENTIFIER_NODE:
7688 case TEMPLATE_ID_EXPR:
7696 /* Determine the type of the entity declared by recurring on the
7698 for (; declarator; declarator = declarator->declarator)
7700 const cp_declarator *inner_declarator;
7703 if (type == error_mark_node)
7704 return error_mark_node;
7706 attrs = declarator->attributes;
7712 if (declarator == NULL || declarator->kind == cdk_id)
7713 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7714 if (declarator->kind == cdk_function)
7715 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7716 if (declarator->kind == cdk_array)
7717 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7718 returned_attrs = decl_attributes (&type,
7719 chainon (returned_attrs, attrs),
7723 if (declarator->kind == cdk_id)
7726 inner_declarator = declarator->declarator;
7728 switch (declarator->kind)
7731 type = create_array_type_for_decl (dname, type,
7732 declarator->u.array.bounds);
7740 /* Declaring a function type.
7741 Make sure we have a valid type for the function to return. */
7743 if (type_quals != TYPE_UNQUALIFIED)
7745 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
7746 warning (OPT_Wreturn_type,
7747 "type qualifiers ignored on function return type");
7748 /* We now know that the TYPE_QUALS don't apply to the
7749 decl, but to its return type. */
7750 type_quals = TYPE_UNQUALIFIED;
7751 set_no_warning = true;
7754 /* Warn about some types functions can't return. */
7756 if (TREE_CODE (type) == FUNCTION_TYPE)
7758 error ("%qs declared as function returning a function", name);
7759 type = integer_type_node;
7761 if (TREE_CODE (type) == ARRAY_TYPE)
7763 error ("%qs declared as function returning an array", name);
7764 type = integer_type_node;
7767 /* Pick up type qualifiers which should be applied to `this'. */
7768 memfn_quals = declarator->u.function.qualifiers;
7770 /* Pick up the exception specifications. */
7771 raises = declarator->u.function.exception_specification;
7773 /* Say it's a definition only for the CALL_EXPR
7774 closest to the identifier. */
7775 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7777 if (ctype == NULL_TREE
7778 && decl_context == FIELD
7780 && (friendp == 0 || dname == current_class_name))
7781 ctype = current_class_type;
7783 if (ctype && (sfk == sfk_constructor
7784 || sfk == sfk_destructor))
7786 /* We are within a class's scope. If our declarator name
7787 is the same as the class name, and we are defining
7788 a function, then it is a constructor/destructor, and
7789 therefore returns a void type. */
7791 /* ISO C++ 12.4/2. A destructor may not be declared
7792 const or volatile. A destructor may not be
7795 ISO C++ 12.1. A constructor may not be declared
7796 const or volatile. A constructor may not be
7797 virtual. A constructor may not be static. */
7799 error ((flags == DTOR_FLAG)
7800 ? "destructor cannot be static member function"
7801 : "constructor cannot be static member function");
7804 error ((flags == DTOR_FLAG)
7805 ? "destructors may not be cv-qualified"
7806 : "constructors may not be cv-qualified");
7807 memfn_quals = TYPE_UNQUALIFIED;
7810 if (decl_context == FIELD
7811 && !member_function_or_else (ctype,
7814 return error_mark_node;
7816 if (flags != DTOR_FLAG)
7818 /* It's a constructor. */
7823 pedwarn ("constructors cannot be declared virtual");
7826 if (decl_context == FIELD
7827 && sfk != sfk_constructor)
7828 return error_mark_node;
7830 if (decl_context == FIELD)
7836 error ("can't initialize friend function %qs", name);
7839 /* Cannot be both friend and virtual. */
7840 error ("virtual functions cannot be friends");
7843 if (decl_context == NORMAL)
7844 error ("friend declaration not in class definition");
7845 if (current_function_decl && funcdef_flag)
7846 error ("can't define friend function %qs in a local "
7851 arg_types = grokparms (declarator->u.function.parameters,
7854 if (inner_declarator
7855 && inner_declarator->kind == cdk_id
7856 && inner_declarator->u.id.sfk == sfk_destructor
7857 && arg_types != void_list_node)
7859 error ("destructors may not have parameters");
7860 arg_types = void_list_node;
7864 type = build_function_type (type, arg_types);
7871 /* Filter out pointers-to-references and references-to-references.
7872 We can get these if a TYPE_DECL is used. */
7874 if (TREE_CODE (type) == REFERENCE_TYPE)
7876 if (declarator->kind != cdk_reference)
7878 error ("cannot declare pointer to %q#T", type);
7879 type = TREE_TYPE (type);
7882 /* In C++0x, we allow reference to reference declarations
7883 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
7884 and template type arguments [14.3.1/4 temp.arg.type]. The
7885 check for direct reference to reference declarations, which
7886 are still forbidden, occurs below. Reasoning behind the change
7887 can be found in DR106, DR540, and the rvalue reference
7889 else if (cxx_dialect == cxx98)
7891 error ("cannot declare reference to %q#T", type);
7892 type = TREE_TYPE (type);
7895 else if (VOID_TYPE_P (type))
7897 if (declarator->kind == cdk_reference)
7898 error ("cannot declare reference to %q#T", type);
7899 else if (declarator->kind == cdk_ptrmem)
7900 error ("cannot declare pointer to %q#T member", type);
7903 /* We now know that the TYPE_QUALS don't apply to the decl,
7904 but to the target of the pointer. */
7905 type_quals = TYPE_UNQUALIFIED;
7907 if (declarator->kind == cdk_ptrmem
7908 && (TREE_CODE (type) == FUNCTION_TYPE || memfn_quals))
7910 memfn_quals |= cp_type_quals (type);
7911 type = build_memfn_type (type,
7912 declarator->u.pointer.class_type,
7914 memfn_quals = TYPE_UNQUALIFIED;
7917 if (declarator->kind == cdk_reference)
7919 /* In C++0x, the type we are creating a reference to might be
7920 a typedef which is itself a reference type. In that case,
7921 we follow the reference collapsing rules in
7922 [7.1.3/8 dcl.typedef] to create the final reference type:
7924 "If a typedef TD names a type that is a reference to a type
7925 T, an attempt to create the type 'lvalue reference to cv TD'
7926 creates the type 'lvalue reference to T,' while an attempt
7927 to create the type "rvalue reference to cv TD' creates the
7930 if (!VOID_TYPE_P (type))
7931 type = cp_build_reference_type
7932 ((TREE_CODE (type) == REFERENCE_TYPE
7933 ? TREE_TYPE (type) : type),
7934 (declarator->u.reference.rvalue_ref
7935 && (TREE_CODE(type) != REFERENCE_TYPE
7936 || TYPE_REF_IS_RVALUE (type))));
7938 /* In C++0x, we need this check for direct reference to
7939 reference declarations, which are forbidden by
7940 [8.3.2/5 dcl.ref]. Reference to reference declarations
7941 are only allowed indirectly through typedefs and template
7942 type arguments. Example:
7944 void foo(int & &); // invalid ref-to-ref decl
7946 typedef int & int_ref;
7947 void foo(int_ref &); // valid ref-to-ref decl
7949 if (inner_declarator && inner_declarator->kind == cdk_reference)
7950 error ("cannot declare reference to %q#T, which is not "
7951 "a typedef or a template type argument", type);
7953 else if (TREE_CODE (type) == METHOD_TYPE)
7954 type = build_ptrmemfunc_type (build_pointer_type (type));
7955 else if (declarator->kind == cdk_ptrmem)
7957 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
7959 if (declarator->u.pointer.class_type == error_mark_node)
7960 /* We will already have complained. */
7961 type = error_mark_node;
7963 type = build_ptrmem_type (declarator->u.pointer.class_type,
7967 type = build_pointer_type (type);
7969 /* Process a list of type modifier keywords (such as
7970 const or volatile) that were given inside the `*' or `&'. */
7972 if (declarator->u.pointer.qualifiers)
7975 = cp_build_qualified_type (type,
7976 declarator->u.pointer.qualifiers);
7977 type_quals = cp_type_quals (type);
7990 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
7991 && TREE_CODE (type) != FUNCTION_TYPE
7992 && TREE_CODE (type) != METHOD_TYPE)
7994 error ("template-id %qD used as a declarator",
7996 unqualified_id = dname;
7999 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8000 qualified with a class-name, turn it into a METHOD_TYPE, unless
8001 we know that the function is static. We take advantage of this
8002 opportunity to do other processing that pertains to entities
8003 explicitly declared to be class members. Note that if DECLARATOR
8004 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8005 would not have exited the loop above. */
8007 && declarator->u.id.qualifying_scope
8008 && TYPE_P (declarator->u.id.qualifying_scope))
8012 ctype = declarator->u.id.qualifying_scope;
8013 ctype = TYPE_MAIN_VARIANT (ctype);
8015 while (t != NULL_TREE && CLASS_TYPE_P (t))
8017 /* You're supposed to have one `template <...>' for every
8018 template class, but you don't need one for a full
8019 specialization. For example:
8021 template <class T> struct S{};
8022 template <> struct S<int> { void f(); };
8023 void S<int>::f () {}
8025 is correct; there shouldn't be a `template <>' for the
8026 definition of `S<int>::f'. */
8027 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8028 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8029 /* T is an explicit (not partial) specialization. All
8030 containing classes must therefore also be explicitly
8033 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8034 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8035 template_count += 1;
8037 t = TYPE_MAIN_DECL (t);
8038 t = DECL_CONTEXT (t);
8041 if (ctype == current_class_type)
8044 pedwarn ("member functions are implicitly friends of their class");
8046 pedwarn ("extra qualification %<%T::%> on member %qs",
8049 else if (/* If the qualifying type is already complete, then we
8050 can skip the following checks. */
8051 !COMPLETE_TYPE_P (ctype)
8052 && (/* If the function is being defined, then
8053 qualifying type must certainly be complete. */
8055 /* A friend declaration of "T::f" is OK, even if
8056 "T" is a template parameter. But, if this
8057 function is not a friend, the qualifying type
8059 || (!friendp && !CLASS_TYPE_P (ctype))
8060 /* For a declaration, the type need not be
8061 complete, if either it is dependent (since there
8062 is no meaningful definition of complete in that
8063 case) or the qualifying class is currently being
8065 || !(dependent_type_p (ctype)
8066 || currently_open_class (ctype)))
8067 /* Check that the qualifying type is complete. */
8068 && !complete_type_or_else (ctype, NULL_TREE))
8069 return error_mark_node;
8070 else if (TREE_CODE (type) == FUNCTION_TYPE)
8072 tree sname = declarator->u.id.unqualified_name;
8074 if (current_class_type
8075 && (!friendp || funcdef_flag))
8078 ? "cannot define member function %<%T::%s%> within %<%T%>"
8079 : "cannot declare member function %<%T::%s%> within %<%T%>",
8080 ctype, name, current_class_type);
8081 return error_mark_node;
8084 if (TREE_CODE (sname) == IDENTIFIER_NODE
8085 && NEW_DELETE_OPNAME_P (sname))
8086 /* Overloaded operator new and operator delete
8087 are always static functions. */
8090 type = build_memfn_type (type, ctype, memfn_quals);
8092 else if (declspecs->specs[(int)ds_typedef]
8093 && current_class_type)
8095 error ("cannot declare member %<%T::%s%> within %qT",
8096 ctype, name, current_class_type);
8097 return error_mark_node;
8101 /* Now TYPE has the actual type. */
8106 *attrlist = chainon (returned_attrs, *attrlist);
8108 attrlist = &returned_attrs;
8111 /* Handle parameter packs. */
8112 if (parameter_pack_p)
8114 if (decl_context == PARM)
8115 /* Turn the type into a pack expansion.*/
8116 type = make_pack_expansion (type);
8118 error ("non-parameter %qs cannot be a parameter pack", name);
8121 /* Did array size calculations overflow? */
8123 if (TREE_CODE (type) == ARRAY_TYPE
8124 && COMPLETE_TYPE_P (type)
8125 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8126 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8128 error ("size of array %qs is too large", name);
8129 /* If we proceed with the array type as it is, we'll eventually
8130 crash in tree_low_cst(). */
8131 type = error_mark_node;
8134 if ((decl_context == FIELD || decl_context == PARM)
8135 && !processing_template_decl
8136 && variably_modified_type_p (type, NULL_TREE))
8138 if (decl_context == FIELD)
8139 error ("data member may not have variably modified type %qT", type);
8141 error ("parameter may not have variably modified type %qT", type);
8142 type = error_mark_node;
8145 if (explicitp == 1 || (explicitp && friendp))
8147 /* [dcl.fct.spec] The explicit specifier shall only be used in
8148 declarations of constructors within a class definition. */
8149 error ("only declarations of constructors can be %<explicit%>");
8153 if (storage_class == sc_mutable)
8155 if (decl_context != FIELD || friendp)
8157 error ("non-member %qs cannot be declared %<mutable%>", name);
8158 storage_class = sc_none;
8160 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8162 error ("non-object member %qs cannot be declared %<mutable%>", name);
8163 storage_class = sc_none;
8165 else if (TREE_CODE (type) == FUNCTION_TYPE
8166 || TREE_CODE (type) == METHOD_TYPE)
8168 error ("function %qs cannot be declared %<mutable%>", name);
8169 storage_class = sc_none;
8173 error ("static %qs cannot be declared %<mutable%>", name);
8174 storage_class = sc_none;
8176 else if (type_quals & TYPE_QUAL_CONST)
8178 error ("const %qs cannot be declared %<mutable%>", name);
8179 storage_class = sc_none;
8183 /* If this is declaring a typedef name, return a TYPE_DECL. */
8184 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8188 /* Note that the grammar rejects storage classes
8189 in typenames, fields or parameters. */
8190 if (current_lang_name == lang_name_java)
8191 TYPE_FOR_JAVA (type) = 1;
8193 /* This declaration:
8195 typedef void f(int) const;
8197 declares a function type which is not a member of any
8198 particular class, but which is cv-qualified; for
8199 example "f S::*" declares a pointer to a const-qualified
8200 member function of S. We record the cv-qualification in the
8202 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8204 type = cp_build_qualified_type (type, memfn_quals);
8206 /* We have now dealt with these qualifiers. */
8207 memfn_quals = TYPE_UNQUALIFIED;
8210 if (decl_context == FIELD)
8211 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8213 decl = build_decl (TYPE_DECL, unqualified_id, type);
8214 if (id_declarator && declarator->u.id.qualifying_scope)
8215 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8217 if (decl_context != FIELD)
8219 if (!current_function_decl)
8220 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8221 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8222 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8223 (current_function_decl)))
8224 /* The TYPE_DECL is "abstract" because there will be
8225 clones of this constructor/destructor, and there will
8226 be copies of this TYPE_DECL generated in those
8228 DECL_ABSTRACT (decl) = 1;
8230 else if (constructor_name_p (unqualified_id, current_class_type))
8231 pedwarn ("ISO C++ forbids nested type %qD with same name "
8232 "as enclosing class",
8235 /* If the user declares "typedef struct {...} foo" then the
8236 struct will have an anonymous name. Fill that name in now.
8237 Nothing can refer to it, so nothing needs know about the name
8239 if (type != error_mark_node
8242 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8243 && TYPE_ANONYMOUS_P (type)
8244 /* Don't do this if there are attributes. */
8245 && (!attrlist || !*attrlist)
8246 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8248 tree oldname = TYPE_NAME (type);
8251 /* Replace the anonymous name with the real name everywhere. */
8252 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8253 if (TYPE_NAME (t) == oldname)
8254 TYPE_NAME (t) = decl;
8256 if (TYPE_LANG_SPECIFIC (type))
8257 TYPE_WAS_ANONYMOUS (type) = 1;
8259 /* If this is a typedef within a template class, the nested
8260 type is a (non-primary) template. The name for the
8261 template needs updating as well. */
8262 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8263 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8264 = TYPE_IDENTIFIER (type);
8266 /* FIXME remangle member functions; member functions of a
8267 type with external linkage have external linkage. */
8271 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8272 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8274 bad_specifiers (decl, "type", virtualp,
8275 memfn_quals != TYPE_UNQUALIFIED,
8276 inlinep, friendp, raises != NULL_TREE);
8281 /* Detect the case of an array type of unspecified size
8282 which came, as such, direct from a typedef name.
8283 We must copy the type, so that the array's domain can be
8284 individually set by the object's initializer. */
8286 if (type && typedef_type
8287 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8288 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8289 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8291 /* Detect where we're using a typedef of function type to declare a
8292 function. PARMS will not be set, so we must create it now. */
8294 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8296 tree decls = NULL_TREE;
8299 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8301 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8303 TREE_CHAIN (decl) = decls;
8307 parms = nreverse (decls);
8309 if (decl_context != TYPENAME)
8311 /* A cv-qualifier-seq shall only be part of the function type
8312 for a non-static member function. [8.3.5/4 dcl.fct] */
8313 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8314 && (current_class_type == NULL_TREE || staticp) )
8317 ? G_("qualified function types cannot be used to "
8318 "declare static member functions")
8319 : G_("qualified function types cannot be used to "
8320 "declare free functions"));
8321 type = TYPE_MAIN_VARIANT (type);
8324 /* The qualifiers on the function type become the qualifiers on
8325 the non-static member function. */
8326 memfn_quals |= cp_type_quals (type);
8330 /* If this is a type name (such as, in a cast or sizeof),
8331 compute the type and return it now. */
8333 if (decl_context == TYPENAME)
8335 /* Note that the grammar rejects storage classes
8336 in typenames, fields or parameters. */
8337 if (type_quals != TYPE_UNQUALIFIED)
8338 type_quals = TYPE_UNQUALIFIED;
8340 /* Special case: "friend class foo" looks like a TYPENAME context. */
8343 if (type_quals != TYPE_UNQUALIFIED)
8345 error ("type qualifiers specified for friend class declaration");
8346 type_quals = TYPE_UNQUALIFIED;
8350 error ("%<inline%> specified for friend class declaration");
8356 /* Don't allow friend declaration without a class-key. */
8357 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8358 pedwarn ("template parameters cannot be friends");
8359 else if (TREE_CODE (type) == TYPENAME_TYPE)
8360 pedwarn ("friend declaration requires class-key, "
8361 "i.e. %<friend class %T::%D%>",
8362 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8364 pedwarn ("friend declaration requires class-key, "
8365 "i.e. %<friend %#T%>",
8369 /* Only try to do this stuff if we didn't already give up. */
8370 if (type != integer_type_node)
8372 /* A friendly class? */
8373 if (current_class_type)
8374 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8377 error ("trying to make class %qT a friend of global scope",
8380 type = void_type_node;
8383 else if (memfn_quals)
8385 if (ctype == NULL_TREE)
8387 if (TREE_CODE (type) != METHOD_TYPE)
8388 error ("invalid qualifiers on non-member function type");
8390 ctype = TYPE_METHOD_BASETYPE (type);
8393 type = build_memfn_type (type, ctype, memfn_quals);
8398 else if (unqualified_id == NULL_TREE && decl_context != PARM
8399 && decl_context != CATCHPARM
8400 && TREE_CODE (type) != UNION_TYPE
8403 error ("abstract declarator %qT used as declaration", type);
8404 return error_mark_node;
8407 /* Only functions may be declared using an operator-function-id. */
8409 && IDENTIFIER_OPNAME_P (unqualified_id)
8410 && TREE_CODE (type) != FUNCTION_TYPE
8411 && TREE_CODE (type) != METHOD_TYPE)
8413 error ("declaration of %qD as non-function", unqualified_id);
8414 return error_mark_node;
8417 /* We don't check parameter types here because we can emit a better
8418 error message later. */
8419 if (decl_context != PARM)
8421 type = check_var_type (unqualified_id, type);
8422 if (type == error_mark_node)
8423 return error_mark_node;
8426 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8427 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8429 if (decl_context == PARM || decl_context == CATCHPARM)
8431 if (ctype || in_namespace)
8432 error ("cannot use %<::%> in parameter declaration");
8434 /* A parameter declared as an array of T is really a pointer to T.
8435 One declared as a function is really a pointer to a function.
8436 One declared as a member is really a pointer to member. */
8438 if (TREE_CODE (type) == ARRAY_TYPE)
8440 /* Transfer const-ness of array into that of type pointed to. */
8441 type = build_pointer_type (TREE_TYPE (type));
8442 type_quals = TYPE_UNQUALIFIED;
8444 else if (TREE_CODE (type) == FUNCTION_TYPE)
8445 type = build_pointer_type (type);
8451 if (decl_context == PARM)
8453 decl = cp_build_parm_decl (unqualified_id, type);
8455 bad_specifiers (decl, "parameter", virtualp,
8456 memfn_quals != TYPE_UNQUALIFIED,
8457 inlinep, friendp, raises != NULL_TREE);
8459 else if (decl_context == FIELD)
8461 /* The C99 flexible array extension. */
8462 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8463 && TYPE_DOMAIN (type) == NULL_TREE)
8465 tree itype = compute_array_index_type (dname, integer_zero_node);
8466 type = build_cplus_array_type (TREE_TYPE (type), itype);
8469 if (type == error_mark_node)
8471 /* Happens when declaring arrays of sizes which
8472 are error_mark_node, for example. */
8475 else if (in_namespace && !friendp)
8477 /* Something like struct S { int N::j; }; */
8478 error ("invalid use of %<::%>");
8479 return error_mark_node;
8481 else if (TREE_CODE (type) == FUNCTION_TYPE)
8484 tree function_context;
8488 if (ctype == NULL_TREE)
8489 ctype = current_class_type;
8491 if (ctype == NULL_TREE)
8493 error ("can't make %qD into a method -- not in a class",
8495 return error_mark_node;
8498 /* ``A union may [ ... ] not [ have ] virtual functions.''
8500 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8502 error ("function %qD declared virtual inside a union",
8504 return error_mark_node;
8507 if (NEW_DELETE_OPNAME_P (unqualified_id))
8511 error ("%qD cannot be declared virtual, since it "
8517 else if (staticp < 2)
8518 type = build_memfn_type (type, ctype, memfn_quals);
8521 /* Check that the name used for a destructor makes sense. */
8522 if (sfk == sfk_destructor)
8526 gcc_assert (friendp);
8527 error ("expected qualified name in friend declaration "
8528 "for destructor %qD",
8529 id_declarator->u.id.unqualified_name);
8530 return error_mark_node;
8533 if (!same_type_p (TREE_OPERAND
8534 (id_declarator->u.id.unqualified_name, 0),
8537 error ("declaration of %qD as member of %qT",
8538 id_declarator->u.id.unqualified_name, ctype);
8539 return error_mark_node;
8543 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8544 function_context = (ctype != NULL_TREE) ?
8545 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8546 publicp = (! friendp || ! staticp)
8547 && function_context == NULL_TREE;
8548 decl = grokfndecl (ctype, type,
8549 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8550 ? unqualified_id : dname,
8553 virtualp, flags, memfn_quals, raises,
8554 friendp ? -1 : 0, friendp, publicp, inlinep,
8556 funcdef_flag, template_count, in_namespace, attrlist);
8557 if (decl == NULL_TREE)
8558 return error_mark_node;
8560 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8561 /* The decl and setting of decl_attr is also turned off. */
8562 decl = build_decl_attribute_variant (decl, decl_attr);
8565 /* [class.conv.ctor]
8567 A constructor declared without the function-specifier
8568 explicit that can be called with a single parameter
8569 specifies a conversion from the type of its first
8570 parameter to the type of its class. Such a constructor
8571 is called a converting constructor. */
8573 DECL_NONCONVERTING_P (decl) = 1;
8574 else if (DECL_CONSTRUCTOR_P (decl))
8576 /* The constructor can be called with exactly one
8577 parameter if there is at least one parameter, and
8578 any subsequent parameters have default arguments.
8579 Ignore any compiler-added parms. */
8580 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8582 if (arg_types == void_list_node
8584 && TREE_CHAIN (arg_types)
8585 && TREE_CHAIN (arg_types) != void_list_node
8586 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8587 DECL_NONCONVERTING_P (decl) = 1;
8590 else if (TREE_CODE (type) == METHOD_TYPE)
8592 /* We only get here for friend declarations of
8593 members of other classes. */
8594 /* All method decls are public, so tell grokfndecl to set
8595 TREE_PUBLIC, also. */
8596 decl = grokfndecl (ctype, type,
8597 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8598 ? unqualified_id : dname,
8601 virtualp, flags, memfn_quals, raises,
8602 friendp ? -1 : 0, friendp, 1, 0, sfk,
8603 funcdef_flag, template_count, in_namespace,
8605 if (decl == NULL_TREE)
8606 return error_mark_node;
8608 else if (!staticp && !dependent_type_p (type)
8609 && !COMPLETE_TYPE_P (complete_type (type))
8610 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8613 error ("field %qD has incomplete type", unqualified_id);
8615 error ("name %qT has incomplete type", type);
8617 /* If we're instantiating a template, tell them which
8618 instantiation made the field's type be incomplete. */
8619 if (current_class_type
8620 && TYPE_NAME (current_class_type)
8621 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8623 && declspecs->type == type)
8624 error (" in instantiation of template %qT",
8625 current_class_type);
8627 return error_mark_node;
8633 error ("%qE is neither function nor member function; "
8634 "cannot be declared friend", unqualified_id);
8642 /* Friends are treated specially. */
8643 if (ctype == current_class_type)
8644 ; /* We already issued a pedwarn. */
8645 else if (decl && DECL_NAME (decl))
8647 if (template_class_depth (current_class_type) == 0)
8649 decl = check_explicit_specialization
8650 (unqualified_id, decl, template_count,
8651 2 * funcdef_flag + 4);
8652 if (decl == error_mark_node)
8653 return error_mark_node;
8656 decl = do_friend (ctype, unqualified_id, decl,
8662 return error_mark_node;
8665 /* Structure field. It may not be a function, except for C++. */
8667 if (decl == NULL_TREE)
8673 /* An attempt is being made to initialize a non-static
8674 member. But, from [class.mem]:
8676 4 A member-declarator can contain a
8677 constant-initializer only if it declares a static
8678 member (_class.static_) of integral or enumeration
8679 type, see _class.static.data_.
8681 This used to be relatively common practice, but
8682 the rest of the compiler does not correctly
8683 handle the initialization unless the member is
8684 static so we make it static below. */
8685 pedwarn ("ISO C++ forbids initialization of member %qD",
8687 pedwarn ("making %qD static", unqualified_id);
8691 if (uses_template_parms (type))
8692 /* We'll check at instantiation time. */
8694 else if (check_static_variable_definition (unqualified_id,
8696 /* If we just return the declaration, crashes
8697 will sometimes occur. We therefore return
8698 void_type_node, as if this was a friend
8699 declaration, to cause callers to completely
8700 ignore this declaration. */
8701 return error_mark_node;
8706 /* C++ allows static class members. All other work
8707 for this is done by grokfield. */
8708 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8709 set_linkage_for_static_data_member (decl);
8710 /* Even if there is an in-class initialization, DECL
8711 is considered undefined until an out-of-class
8712 definition is provided. */
8713 DECL_EXTERNAL (decl) = 1;
8716 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
8720 decl = build_decl (FIELD_DECL, unqualified_id, type);
8721 DECL_NONADDRESSABLE_P (decl) = bitfield;
8722 if (bitfield && !unqualified_id)
8723 TREE_NO_WARNING (decl) = 1;
8725 if (storage_class == sc_mutable)
8727 DECL_MUTABLE_P (decl) = 1;
8728 storage_class = sc_none;
8732 bad_specifiers (decl, "field", virtualp,
8733 memfn_quals != TYPE_UNQUALIFIED,
8734 inlinep, friendp, raises != NULL_TREE);
8737 else if (TREE_CODE (type) == FUNCTION_TYPE
8738 || TREE_CODE (type) == METHOD_TYPE)
8743 if (!unqualified_id)
8744 return error_mark_node;
8746 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8747 original_name = dname;
8749 original_name = unqualified_id;
8751 if (storage_class == sc_auto)
8752 error ("storage class %<auto%> invalid for function %qs", name);
8753 else if (storage_class == sc_register)
8754 error ("storage class %<register%> invalid for function %qs", name);
8756 error ("storage class %<__thread%> invalid for function %qs", name);
8758 /* Function declaration not at top level.
8759 Storage classes other than `extern' are not allowed
8760 and `extern' makes no difference. */
8761 if (! toplevel_bindings_p ()
8762 && (storage_class == sc_static
8763 || declspecs->specs[(int)ds_inline])
8766 if (storage_class == sc_static)
8767 pedwarn ("%<static%> specified invalid for function %qs "
8768 "declared out of global scope", name);
8770 pedwarn ("%<inline%> specifier invalid for function %qs "
8771 "declared out of global scope", name);
8774 if (ctype == NULL_TREE)
8778 error ("virtual non-class function %qs", name);
8782 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8783 && !NEW_DELETE_OPNAME_P (original_name))
8784 type = build_method_type_directly (ctype,
8786 TYPE_ARG_TYPES (type));
8788 /* Record presence of `static'. */
8789 publicp = (ctype != NULL_TREE
8790 || storage_class == sc_extern
8791 || storage_class != sc_static);
8793 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8794 virtualp, flags, memfn_quals, raises,
8796 publicp, inlinep, sfk, funcdef_flag,
8797 template_count, in_namespace, attrlist);
8798 if (decl == NULL_TREE)
8799 return error_mark_node;
8803 int invalid_static = 0;
8805 /* Don't allow a static member function in a class, and forbid
8806 declaring main to be static. */
8807 if (TREE_CODE (type) == METHOD_TYPE)
8809 pedwarn ("cannot declare member function %qD to have "
8810 "static linkage", decl);
8813 else if (current_function_decl)
8815 /* FIXME need arm citation */
8816 error ("cannot declare static function inside another function");
8823 storage_class = sc_none;
8829 /* It's a variable. */
8831 /* An uninitialized decl with `extern' is a reference. */
8832 decl = grokvardecl (type, unqualified_id,
8835 (type_quals & TYPE_QUAL_CONST) != 0,
8836 ctype ? ctype : in_namespace);
8837 bad_specifiers (decl, "variable", virtualp,
8838 memfn_quals != TYPE_UNQUALIFIED,
8839 inlinep, friendp, raises != NULL_TREE);
8843 DECL_CONTEXT (decl) = ctype;
8846 pedwarn ("%<static%> may not be used when defining "
8847 "(as opposed to declaring) a static data member");
8849 storage_class = sc_none;
8851 if (storage_class == sc_register && TREE_STATIC (decl))
8853 error ("static member %qD declared %<register%>", decl);
8854 storage_class = sc_none;
8856 if (storage_class == sc_extern && pedantic)
8858 pedwarn ("cannot explicitly declare member %q#D to have "
8861 storage_class = sc_none;
8866 /* Record `register' declaration for warnings on &
8867 and in case doing stupid register allocation. */
8869 if (storage_class == sc_register)
8870 DECL_REGISTER (decl) = 1;
8871 else if (storage_class == sc_extern)
8872 DECL_THIS_EXTERN (decl) = 1;
8873 else if (storage_class == sc_static)
8874 DECL_THIS_STATIC (decl) = 1;
8876 /* Record constancy and volatility. There's no need to do this
8877 when processing a template; we'll do this for the instantiated
8878 declaration based on the type of DECL. */
8879 if (!processing_template_decl)
8880 cp_apply_type_quals_to_decl (type_quals, decl);
8883 TREE_NO_WARNING (decl) = 1;
8889 /* Subroutine of start_function. Ensure that each of the parameter
8890 types (as listed in PARMS) is complete, as is required for a
8891 function definition. */
8894 require_complete_types_for_parms (tree parms)
8896 for (; parms; parms = TREE_CHAIN (parms))
8898 if (dependent_type_p (TREE_TYPE (parms)))
8900 if (!VOID_TYPE_P (TREE_TYPE (parms))
8901 && complete_type_or_else (TREE_TYPE (parms), parms))
8903 relayout_decl (parms);
8904 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8907 /* grokparms or complete_type_or_else will have already issued
8909 TREE_TYPE (parms) = error_mark_node;
8913 /* Returns nonzero if T is a local variable. */
8916 local_variable_p (tree t)
8918 if ((TREE_CODE (t) == VAR_DECL
8919 /* A VAR_DECL with a context that is a _TYPE is a static data
8921 && !TYPE_P (CP_DECL_CONTEXT (t))
8922 /* Any other non-local variable must be at namespace scope. */
8923 && !DECL_NAMESPACE_SCOPE_P (t))
8924 || (TREE_CODE (t) == PARM_DECL))
8930 /* Returns nonzero if T is an automatic local variable or a label.
8931 (These are the declarations that need to be remapped when the code
8932 containing them is duplicated.) */
8935 nonstatic_local_decl_p (tree t)
8937 return ((local_variable_p (t) && !TREE_STATIC (t))
8938 || TREE_CODE (t) == LABEL_DECL
8939 || TREE_CODE (t) == RESULT_DECL);
8942 /* Like local_variable_p, but suitable for use as a tree-walking
8946 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8947 void *data ATTRIBUTE_UNUSED)
8949 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8951 else if (TYPE_P (*tp))
8958 /* Check that ARG, which is a default-argument expression for a
8959 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8960 something goes wrong. DECL may also be a _TYPE node, rather than a
8961 DECL, if there is no DECL available. */
8964 check_default_argument (tree decl, tree arg)
8969 if (TREE_CODE (arg) == DEFAULT_ARG)
8970 /* We get a DEFAULT_ARG when looking at an in-class declaration
8971 with a default argument. Ignore the argument for now; we'll
8972 deal with it after the class is complete. */
8981 decl_type = TREE_TYPE (decl);
8983 if (arg == error_mark_node
8984 || decl == error_mark_node
8985 || TREE_TYPE (arg) == error_mark_node
8986 || decl_type == error_mark_node)
8987 /* Something already went wrong. There's no need to check
8989 return error_mark_node;
8991 /* [dcl.fct.default]
8993 A default argument expression is implicitly converted to the
8995 if (!TREE_TYPE (arg)
8996 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
8999 error ("default argument for %q#D has type %qT",
9000 decl, TREE_TYPE (arg));
9002 error ("default argument for parameter of type %qT has type %qT",
9003 decl_type, TREE_TYPE (arg));
9005 return error_mark_node;
9008 /* [dcl.fct.default]
9010 Local variables shall not be used in default argument
9013 The keyword `this' shall not be used in a default argument of a
9015 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
9019 error ("default argument %qE uses local variable %qD", arg, var);
9020 return error_mark_node;
9027 /* Decode the list of parameter types for a function type.
9028 Given the list of things declared inside the parens,
9029 return a list of types.
9031 If this parameter does not end with an ellipsis, we append
9034 *PARMS is set to the chain of PARM_DECLs created. */
9037 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9039 tree result = NULL_TREE;
9040 tree decls = NULL_TREE;
9041 int ellipsis = !first_parm || first_parm->ellipsis_p;
9042 cp_parameter_declarator *parm;
9044 struct pointer_set_t *unique_decls = pointer_set_create ();
9046 for (parm = first_parm; parm != NULL; parm = parm->next)
9048 tree type = NULL_TREE;
9049 tree init = parm->default_argument;
9053 if (parm == no_parameters)
9056 attrs = parm->decl_specifiers.attributes;
9057 parm->decl_specifiers.attributes = NULL_TREE;
9058 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9059 PARM, init != NULL_TREE, &attrs);
9060 if (! decl || TREE_TYPE (decl) == error_mark_node)
9064 cplus_decl_attributes (&decl, attrs, 0);
9066 type = TREE_TYPE (decl);
9067 if (VOID_TYPE_P (type))
9069 if (same_type_p (type, void_type_node)
9070 && DECL_SELF_REFERENCE_P (type)
9071 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9072 /* this is a parmlist of `(void)', which is ok. */
9074 cxx_incomplete_type_error (decl, type);
9075 /* It's not a good idea to actually create parameters of
9076 type `void'; other parts of the compiler assume that a
9077 void type terminates the parameter list. */
9078 type = error_mark_node;
9079 TREE_TYPE (decl) = error_mark_node;
9082 if (type != error_mark_node)
9084 /* Top-level qualifiers on the parameters are
9085 ignored for function types. */
9086 type = cp_build_qualified_type (type, 0);
9087 if (TREE_CODE (type) == METHOD_TYPE)
9089 error ("parameter %qD invalidly declared method type", decl);
9090 type = build_pointer_type (type);
9091 TREE_TYPE (decl) = type;
9093 else if (abstract_virtuals_error (decl, type))
9094 any_error = 1; /* Seems like a good idea. */
9095 else if (POINTER_TYPE_P (type))
9097 /* [dcl.fct]/6, parameter types cannot contain pointers
9098 (references) to arrays of unknown bound. */
9099 tree t = TREE_TYPE (type);
9100 int ptr = TYPE_PTR_P (type);
9106 else if (TREE_CODE (t) != ARRAY_TYPE)
9108 else if (!TYPE_DOMAIN (t))
9112 if (TREE_CODE (t) == ARRAY_TYPE)
9113 error ("parameter %qD includes %s to array of unknown "
9115 decl, ptr ? "pointer" : "reference", t);
9120 else if (init && !processing_template_decl)
9121 init = check_default_argument (decl, init);
9124 if (TREE_CODE (decl) == PARM_DECL
9125 && FUNCTION_PARAMETER_PACK_P (decl)
9127 error ("parameter packs must be at the end of the parameter list");
9129 if (DECL_NAME (decl))
9131 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9132 error ("multiple parameters named %qE", DECL_NAME (decl));
9134 pointer_set_insert (unique_decls, DECL_NAME (decl));
9137 TREE_CHAIN (decl) = decls;
9139 result = tree_cons (init, type, result);
9141 decls = nreverse (decls);
9142 result = nreverse (result);
9144 result = chainon (result, void_list_node);
9147 pointer_set_destroy (unique_decls);
9152 /* D is a constructor or overloaded `operator='.
9154 Let T be the class in which D is declared. Then, this function
9157 -1 if D's is an ill-formed constructor or copy assignment operator
9158 whose first parameter is of type `T'.
9159 0 if D is not a copy constructor or copy assignment
9161 1 if D is a copy constructor or copy assignment operator whose
9162 first parameter is a reference to const qualified T.
9163 2 if D is a copy constructor or copy assignment operator whose
9164 first parameter is a reference to non-const qualified T.
9166 This function can be used as a predicate. Positive values indicate
9167 a copy constructor and nonzero values indicate a copy assignment
9177 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9179 if (TREE_CODE (d) == TEMPLATE_DECL
9180 || (DECL_TEMPLATE_INFO (d)
9181 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9182 /* Instantiations of template member functions are never copy
9183 functions. Note that member functions of templated classes are
9184 represented as template functions internally, and we must
9185 accept those as copy functions. */
9188 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9192 arg_type = TREE_VALUE (args);
9193 if (arg_type == error_mark_node)
9196 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9198 /* Pass by value copy assignment operator. */
9201 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9202 && !TYPE_REF_IS_RVALUE (arg_type)
9203 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9205 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9211 args = TREE_CHAIN (args);
9213 if (args && args != void_list_node && !TREE_PURPOSE (args))
9214 /* There are more non-optional args. */
9220 /* D is a constructor or overloaded `operator='.
9222 Let T be the class in which D is declared. Then, this function
9223 returns true when D is a move constructor or move assignment
9224 operator, false otherwise. */
9231 bool result = false;
9233 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9235 if (cxx_dialect == cxx98)
9236 /* There are no move constructors if we are in C++98 mode. */
9239 if (TREE_CODE (d) == TEMPLATE_DECL
9240 || (DECL_TEMPLATE_INFO (d)
9241 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9242 /* Instantiations of template member functions are never copy
9243 functions. Note that member functions of templated classes are
9244 represented as template functions internally, and we must
9245 accept those as copy functions. */
9248 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9252 arg_type = TREE_VALUE (args);
9253 if (arg_type == error_mark_node)
9256 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9257 && TYPE_REF_IS_RVALUE (arg_type)
9258 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9262 args = TREE_CHAIN (args);
9264 if (args && args != void_list_node && !TREE_PURPOSE (args))
9265 /* There are more non-optional args. */
9271 /* Remember any special properties of member function DECL. */
9273 void grok_special_member_properties (tree decl)
9277 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9280 class_type = DECL_CONTEXT (decl);
9281 if (DECL_CONSTRUCTOR_P (decl))
9283 int ctor = copy_fn_p (decl);
9285 TYPE_HAS_CONSTRUCTOR (class_type) = 1;
9291 A non-template constructor for class X is a copy
9292 constructor if its first parameter is of type X&, const
9293 X&, volatile X& or const volatile X&, and either there
9294 are no other parameters or else all other parameters have
9295 default arguments. */
9296 TYPE_HAS_INIT_REF (class_type) = 1;
9298 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9300 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9301 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9303 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9307 A non-template assignment operator for class X is a copy
9308 assignment operator if its parameter is of type X, X&, const
9309 X&, volatile X& or const volatile X&. */
9311 int assop = copy_fn_p (decl);
9315 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9317 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9322 /* Check a constructor DECL has the correct form. Complains
9323 if the class has a constructor of the form X(X). */
9326 grok_ctor_properties (tree ctype, tree decl)
9328 int ctor_parm = copy_fn_p (decl);
9334 A declaration of a constructor for a class X is ill-formed if
9335 its first parameter is of type (optionally cv-qualified) X
9336 and either there are no other parameters or else all other
9337 parameters have default arguments.
9339 We *don't* complain about member template instantiations that
9340 have this form, though; they can occur as we try to decide
9341 what constructor to use during overload resolution. Since
9342 overload resolution will never prefer such a constructor to
9343 the non-template copy constructor (which is either explicitly
9344 or implicitly defined), there's no need to worry about their
9345 existence. Theoretically, they should never even be
9346 instantiated, but that's hard to forestall. */
9347 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9355 /* An operator with this code is unary, but can also be binary. */
9358 ambi_op_p (enum tree_code code)
9360 return (code == INDIRECT_REF
9361 || code == ADDR_EXPR
9362 || code == UNARY_PLUS_EXPR
9363 || code == NEGATE_EXPR
9364 || code == PREINCREMENT_EXPR
9365 || code == PREDECREMENT_EXPR);
9368 /* An operator with this name can only be unary. */
9371 unary_op_p (enum tree_code code)
9373 return (code == TRUTH_NOT_EXPR
9374 || code == BIT_NOT_EXPR
9375 || code == COMPONENT_REF
9376 || code == TYPE_EXPR);
9379 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9380 errors are issued for invalid declarations. */
9383 grok_op_properties (tree decl, bool complain)
9385 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9387 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9388 tree name = DECL_NAME (decl);
9389 enum tree_code operator_code;
9394 /* Count the number of arguments and check for ellipsis. */
9395 for (argtype = argtypes, arity = 0;
9396 argtype && argtype != void_list_node;
9397 argtype = TREE_CHAIN (argtype))
9399 ellipsis_p = !argtype;
9401 class_type = DECL_CONTEXT (decl);
9402 if (class_type && !CLASS_TYPE_P (class_type))
9403 class_type = NULL_TREE;
9405 if (DECL_CONV_FN_P (decl))
9406 operator_code = TYPE_EXPR;
9410 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9411 if (ansi_opname (CODE) == name) \
9413 operator_code = (CODE); \
9416 else if (ansi_assopname (CODE) == name) \
9418 operator_code = (CODE); \
9419 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9423 #include "operators.def"
9429 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9430 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9433 switch (operator_code)
9436 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9440 TYPE_GETS_DELETE (class_type) |= 1;
9444 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9447 case VEC_DELETE_EXPR:
9448 TYPE_GETS_DELETE (class_type) |= 2;
9455 /* [basic.std.dynamic.allocation]/1:
9457 A program is ill-formed if an allocation function is declared
9458 in a namespace scope other than global scope or declared static
9461 The same also holds true for deallocation functions. */
9462 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9463 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9465 if (DECL_NAMESPACE_SCOPE_P (decl))
9467 if (CP_DECL_CONTEXT (decl) != global_namespace)
9469 error ("%qD may not be declared within a namespace", decl);
9472 else if (!TREE_PUBLIC (decl))
9474 error ("%qD may not be declared as static", decl);
9480 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9481 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9482 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9483 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9486 /* An operator function must either be a non-static member function
9487 or have at least one parameter of a class, a reference to a class,
9488 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9489 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9491 if (operator_code == TYPE_EXPR
9492 || operator_code == CALL_EXPR
9493 || operator_code == COMPONENT_REF
9494 || operator_code == ARRAY_REF
9495 || operator_code == NOP_EXPR)
9497 error ("%qD must be a nonstatic member function", decl);
9504 if (DECL_STATIC_FUNCTION_P (decl))
9506 error ("%qD must be either a non-static member "
9507 "function or a non-member function", decl);
9511 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9513 tree arg = non_reference (TREE_VALUE (p));
9514 if (arg == error_mark_node)
9517 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9518 because these checks are performed even on
9519 template functions. */
9520 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9524 if (!p || p == void_list_node)
9527 error ("%qD must have an argument of class or "
9528 "enumerated type", decl);
9534 /* There are no restrictions on the arguments to an overloaded
9536 if (operator_code == CALL_EXPR)
9539 /* Warn about conversion operators that will never be used. */
9540 if (IDENTIFIER_TYPENAME_P (name)
9541 && ! DECL_TEMPLATE_INFO (decl)
9543 /* Warn only declaring the function; there is no need to
9544 warn again about out-of-class definitions. */
9545 && class_type == current_class_type)
9547 tree t = TREE_TYPE (name);
9548 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9549 const char *what = 0;
9552 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9554 if (TREE_CODE (t) == VOID_TYPE)
9556 else if (class_type)
9558 if (t == class_type)
9559 what = "the same type";
9560 /* Don't force t to be complete here. */
9561 else if (IS_AGGR_TYPE (t)
9562 && COMPLETE_TYPE_P (t)
9563 && DERIVED_FROM_P (t, class_type))
9564 what = "a base class";
9568 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9569 "conversion operator",
9570 ref ? "a reference to " : "", what);
9573 if (operator_code == COND_EXPR)
9576 error ("ISO C++ prohibits overloading operator ?:");
9579 else if (ellipsis_p)
9581 error ("%qD must not have variable number of arguments", decl);
9584 else if (ambi_op_p (operator_code))
9587 /* We pick the one-argument operator codes by default, so
9588 we don't have to change anything. */
9590 else if (arity == 2)
9592 /* If we thought this was a unary operator, we now know
9593 it to be a binary operator. */
9594 switch (operator_code)
9597 operator_code = MULT_EXPR;
9601 operator_code = BIT_AND_EXPR;
9604 case UNARY_PLUS_EXPR:
9605 operator_code = PLUS_EXPR;
9609 operator_code = MINUS_EXPR;
9612 case PREINCREMENT_EXPR:
9613 operator_code = POSTINCREMENT_EXPR;
9616 case PREDECREMENT_EXPR:
9617 operator_code = POSTDECREMENT_EXPR;
9624 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9626 if ((operator_code == POSTINCREMENT_EXPR
9627 || operator_code == POSTDECREMENT_EXPR)
9628 && ! processing_template_decl
9629 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9632 error ("postfix %qD must take %<int%> as its argument",
9635 error ("postfix %qD must take %<int%> as its second "
9643 error ("%qD must take either zero or one argument", decl);
9645 error ("%qD must take either one or two arguments", decl);
9649 /* More Effective C++ rule 6. */
9651 && (operator_code == POSTINCREMENT_EXPR
9652 || operator_code == POSTDECREMENT_EXPR
9653 || operator_code == PREINCREMENT_EXPR
9654 || operator_code == PREDECREMENT_EXPR))
9656 tree arg = TREE_VALUE (argtypes);
9657 tree ret = TREE_TYPE (TREE_TYPE (decl));
9658 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9659 arg = TREE_TYPE (arg);
9660 arg = TYPE_MAIN_VARIANT (arg);
9661 if (operator_code == PREINCREMENT_EXPR
9662 || operator_code == PREDECREMENT_EXPR)
9664 if (TREE_CODE (ret) != REFERENCE_TYPE
9665 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9667 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9668 build_reference_type (arg));
9672 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9673 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
9677 else if (unary_op_p (operator_code))
9682 error ("%qD must take %<void%>", decl);
9684 error ("%qD must take exactly one argument", decl);
9688 else /* if (binary_op_p (operator_code)) */
9693 error ("%qD must take exactly one argument", decl);
9695 error ("%qD must take exactly two arguments", decl);
9699 /* More Effective C++ rule 7. */
9701 && (operator_code == TRUTH_ANDIF_EXPR
9702 || operator_code == TRUTH_ORIF_EXPR
9703 || operator_code == COMPOUND_EXPR))
9704 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
9708 /* Effective C++ rule 23. */
9711 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9712 && (operator_code == PLUS_EXPR
9713 || operator_code == MINUS_EXPR
9714 || operator_code == TRUNC_DIV_EXPR
9715 || operator_code == MULT_EXPR
9716 || operator_code == TRUNC_MOD_EXPR)
9717 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9718 warning (OPT_Weffc__, "%qD should return by value", decl);
9721 for (; argtypes && argtypes != void_list_node;
9722 argtypes = TREE_CHAIN (argtypes))
9723 if (TREE_PURPOSE (argtypes))
9725 TREE_PURPOSE (argtypes) = NULL_TREE;
9726 if (operator_code == POSTINCREMENT_EXPR
9727 || operator_code == POSTDECREMENT_EXPR)
9730 pedwarn ("%qD cannot have default arguments", decl);
9734 error ("%qD cannot have default arguments", decl);
9742 /* Return a string giving the keyword associate with CODE. */
9745 tag_name (enum tag_types code)
9764 /* Name lookup in an elaborated-type-specifier (after the keyword
9765 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9766 elaborated-type-specifier is invalid, issue a diagnostic and return
9767 error_mark_node; otherwise, return the *_TYPE to which it referred.
9768 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9771 check_elaborated_type_specifier (enum tag_types tag_code,
9773 bool allow_template_p)
9779 struct S { struct S *p; };
9781 name lookup will find the TYPE_DECL for the implicit "S::S"
9782 typedef. Adjust for that here. */
9783 if (DECL_SELF_REFERENCE_P (decl))
9784 decl = TYPE_NAME (TREE_TYPE (decl));
9786 type = TREE_TYPE (decl);
9788 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9789 is false for this case as well. */
9790 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9792 error ("using template type parameter %qT after %qs",
9793 type, tag_name (tag_code));
9794 return error_mark_node;
9798 If the identifier resolves to a typedef-name or a template
9799 type-parameter, the elaborated-type-specifier is ill-formed.
9801 In other words, the only legitimate declaration to use in the
9802 elaborated type specifier is the implicit typedef created when
9803 the type is declared. */
9804 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9805 && tag_code != typename_type)
9807 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9808 error ("%q+D has a previous declaration here", decl);
9809 return error_mark_node;
9811 else if (TREE_CODE (type) != RECORD_TYPE
9812 && TREE_CODE (type) != UNION_TYPE
9813 && tag_code != enum_type
9814 && tag_code != typename_type)
9816 error ("%qT referred to as %qs", type, tag_name (tag_code));
9817 error ("%q+T has a previous declaration here", type);
9818 return error_mark_node;
9820 else if (TREE_CODE (type) != ENUMERAL_TYPE
9821 && tag_code == enum_type)
9823 error ("%qT referred to as enum", type);
9824 error ("%q+T has a previous declaration here", type);
9825 return error_mark_node;
9827 else if (!allow_template_p
9828 && TREE_CODE (type) == RECORD_TYPE
9829 && CLASSTYPE_IS_TEMPLATE (type))
9831 /* If a class template appears as elaborated type specifier
9832 without a template header such as:
9834 template <class T> class C {};
9835 void f(class C); // No template header here
9837 then the required template argument is missing. */
9838 error ("template argument required for %<%s %T%>",
9839 tag_name (tag_code),
9840 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9841 return error_mark_node;
9847 /* Lookup NAME in elaborate type specifier in scope according to
9848 SCOPE and issue diagnostics if necessary.
9849 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9850 found, and ERROR_MARK_NODE for type error. */
9853 lookup_and_check_tag (enum tag_types tag_code, tree name,
9854 tag_scope scope, bool template_header_p)
9858 if (scope == ts_global)
9860 /* First try ordinary name lookup, ignoring hidden class name
9861 injected via friend declaration. */
9862 decl = lookup_name_prefer_type (name, 2);
9863 /* If that fails, the name will be placed in the smallest
9864 non-class, non-function-prototype scope according to 3.3.1/5.
9865 We may already have a hidden name declared as friend in this
9866 scope. So lookup again but not ignoring hidden names.
9867 If we find one, that name will be made visible rather than
9868 creating a new tag. */
9870 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9873 decl = lookup_type_scope (name, scope);
9875 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9876 decl = DECL_TEMPLATE_RESULT (decl);
9878 if (decl && TREE_CODE (decl) == TYPE_DECL)
9880 /* Look for invalid nested type:
9884 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9886 error ("%qD has the same name as the class in which it is "
9889 return error_mark_node;
9892 /* Two cases we need to consider when deciding if a class
9893 template is allowed as an elaborated type specifier:
9894 1. It is a self reference to its own class.
9895 2. It comes with a template header.
9899 template <class T> class C {
9900 class C *c1; // DECL_SELF_REFERENCE_P is true
9903 template <class U> class C; // template_header_p is true
9904 template <class T> class C<T>::D {
9905 class C *c2; // DECL_SELF_REFERENCE_P is true
9908 t = check_elaborated_type_specifier (tag_code,
9911 | DECL_SELF_REFERENCE_P (decl));
9918 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9919 Define the tag as a forward-reference if it is not defined.
9921 If a declaration is given, process it here, and report an error if
9922 multiple declarations are not identical.
9924 SCOPE is TS_CURRENT when this is also a definition. Only look in
9925 the current frame for the name (since C++ allows new names in any
9926 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9927 declaration. Only look beginning from the current scope outward up
9928 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9930 TEMPLATE_HEADER_P is true when this declaration is preceded by
9931 a set of template parameters. */
9934 xref_tag (enum tag_types tag_code, tree name,
9935 tag_scope scope, bool template_header_p)
9937 enum tree_code code;
9939 tree context = NULL_TREE;
9941 timevar_push (TV_NAME_LOOKUP);
9943 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9955 code = ENUMERAL_TYPE;
9961 /* In case of anonymous name, xref_tag is only called to
9962 make type node and push name. Name lookup is not required. */
9963 if (ANON_AGGRNAME_P (name))
9966 t = lookup_and_check_tag (tag_code, name,
9967 scope, template_header_p);
9969 if (t == error_mark_node)
9970 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
9972 if (scope != ts_current && t && current_class_type
9973 && template_class_depth (current_class_type)
9974 && template_header_p)
9976 /* Since SCOPE is not TS_CURRENT, we are not looking at a
9977 definition of this tag. Since, in addition, we are currently
9978 processing a (member) template declaration of a template
9979 class, we must be very careful; consider:
9986 { template <class V>
9987 friend struct S1; };
9989 Here, the S2::S1 declaration should not be confused with the
9990 outer declaration. In particular, the inner version should
9991 have a template parameter of level 2, not level 1. This
9992 would be particularly important if the member declaration
9995 template <class V = U> friend struct S1;
9997 say, when we should tsubst into `U' when instantiating
9998 S2. On the other hand, when presented with:
10008 we must find the inner binding eventually. We
10009 accomplish this by making sure that the new type we
10010 create to represent this declaration has the right
10012 context = TYPE_CONTEXT (t);
10018 /* If no such tag is yet defined, create a forward-reference node
10019 and record it as the "definition".
10020 When a real declaration of this type is found,
10021 the forward-reference will be altered into a real type. */
10022 if (code == ENUMERAL_TYPE)
10024 error ("use of enum %q#D without previous declaration", name);
10025 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10029 t = make_aggr_type (code);
10030 TYPE_CONTEXT (t) = context;
10031 t = pushtag (name, t, scope);
10036 if (template_header_p && IS_AGGR_TYPE (t))
10038 if (!redeclare_class_template (t, current_template_parms))
10039 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10041 else if (!processing_template_decl
10042 && CLASS_TYPE_P (t)
10043 && CLASSTYPE_IS_TEMPLATE (t))
10045 error ("redeclaration of %qT as a non-template", t);
10046 error ("previous declaration %q+D", t);
10047 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10050 /* Make injected friend class visible. */
10051 if (scope != ts_within_enclosing_non_class
10052 && hidden_name_p (TYPE_NAME (t)))
10054 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10055 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10057 if (TYPE_TEMPLATE_INFO (t))
10059 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10060 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10065 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10069 xref_tag_from_type (tree old, tree id, tag_scope scope)
10071 enum tag_types tag_kind;
10073 if (TREE_CODE (old) == RECORD_TYPE)
10074 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10076 tag_kind = union_type;
10078 if (id == NULL_TREE)
10079 id = TYPE_IDENTIFIER (old);
10081 return xref_tag (tag_kind, id, scope, false);
10084 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10085 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10086 access_* node, and the TREE_VALUE is the type of the base-class.
10087 Non-NULL TREE_TYPE indicates virtual inheritance.
10089 Returns true if the binfo hierarchy was successfully created,
10090 false if an error was detected. */
10093 xref_basetypes (tree ref, tree base_list)
10096 tree binfo, base_binfo;
10097 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10098 unsigned max_bases = 0; /* Maximum direct bases. */
10100 tree default_access;
10101 tree igo_prev; /* Track Inheritance Graph Order. */
10103 if (ref == error_mark_node)
10106 /* The base of a derived class is private by default, all others are
10108 default_access = (TREE_CODE (ref) == RECORD_TYPE
10109 && CLASSTYPE_DECLARED_CLASS (ref)
10110 ? access_private_node : access_public_node);
10112 /* First, make sure that any templates in base-classes are
10113 instantiated. This ensures that if we call ourselves recursively
10114 we do not get confused about which classes are marked and which
10116 basep = &base_list;
10119 tree basetype = TREE_VALUE (*basep);
10121 if (!(processing_template_decl && uses_template_parms (basetype))
10122 && !complete_type_or_else (basetype, NULL))
10123 /* An incomplete type. Remove it from the list. */
10124 *basep = TREE_CHAIN (*basep);
10128 if (TREE_TYPE (*basep))
10130 if (CLASS_TYPE_P (basetype))
10131 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10132 basep = &TREE_CHAIN (*basep);
10136 TYPE_MARKED_P (ref) = 1;
10138 /* The binfo slot should be empty, unless this is an (ill-formed)
10140 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10141 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10143 binfo = make_tree_binfo (max_bases);
10145 TYPE_BINFO (ref) = binfo;
10146 BINFO_OFFSET (binfo) = size_zero_node;
10147 BINFO_TYPE (binfo) = ref;
10151 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10152 /* An aggregate cannot have baseclasses. */
10153 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10155 if (TREE_CODE (ref) == UNION_TYPE)
10157 error ("derived union %qT invalid", ref);
10164 if (TYPE_FOR_JAVA (ref))
10166 error ("Java class %qT cannot have multiple bases", ref);
10173 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10175 if (TYPE_FOR_JAVA (ref))
10177 error ("Java class %qT cannot have virtual bases", ref);
10182 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10184 tree access = TREE_PURPOSE (base_list);
10185 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10186 tree basetype = TREE_VALUE (base_list);
10188 if (access == access_default_node)
10189 access = default_access;
10191 if (PACK_EXPANSION_P (basetype))
10192 basetype = PACK_EXPANSION_PATTERN (basetype);
10193 if (TREE_CODE (basetype) == TYPE_DECL)
10194 basetype = TREE_TYPE (basetype);
10195 if (TREE_CODE (basetype) != RECORD_TYPE
10196 && TREE_CODE (basetype) != TYPENAME_TYPE
10197 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10198 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10200 error ("base type %qT fails to be a struct or class type",
10205 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10206 TYPE_FOR_JAVA (ref) = 1;
10208 base_binfo = NULL_TREE;
10209 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10211 base_binfo = TYPE_BINFO (basetype);
10212 /* The original basetype could have been a typedef'd type. */
10213 basetype = BINFO_TYPE (base_binfo);
10215 /* Inherit flags from the base. */
10216 TYPE_HAS_NEW_OPERATOR (ref)
10217 |= TYPE_HAS_NEW_OPERATOR (basetype);
10218 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10219 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10220 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10221 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10222 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10223 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10224 CLASSTYPE_REPEATED_BASE_P (ref)
10225 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10228 /* We must do this test after we've seen through a typedef
10230 if (TYPE_MARKED_P (basetype))
10232 if (basetype == ref)
10233 error ("recursive type %qT undefined", basetype);
10235 error ("duplicate base type %qT invalid", basetype);
10239 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10240 /* Regenerate the pack expansion for the bases. */
10241 basetype = make_pack_expansion (basetype);
10243 TYPE_MARKED_P (basetype) = 1;
10245 base_binfo = copy_binfo (base_binfo, basetype, ref,
10246 &igo_prev, via_virtual);
10247 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10248 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10250 BINFO_BASE_APPEND (binfo, base_binfo);
10251 BINFO_BASE_ACCESS_APPEND (binfo, access);
10254 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10255 /* If we have space in the vbase vector, we must have shared at
10256 least one of them, and are therefore diamond shaped. */
10257 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10259 /* Unmark all the types. */
10260 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10261 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10262 TYPE_MARKED_P (ref) = 0;
10264 /* Now see if we have a repeated base type. */
10265 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10267 for (base_binfo = binfo; base_binfo;
10268 base_binfo = TREE_CHAIN (base_binfo))
10270 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10272 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10275 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10277 for (base_binfo = binfo; base_binfo;
10278 base_binfo = TREE_CHAIN (base_binfo))
10279 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10280 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10289 /* Begin compiling the definition of an enumeration type.
10291 Returns the type object, as yet incomplete.
10292 Also records info about it so that build_enumerator
10293 may be used to declare the individual values as they are read. */
10296 start_enum (tree name)
10300 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10302 /* If this is the real definition for a previous forward reference,
10303 fill in the contents in the same object that used to be the
10304 forward reference. */
10306 enumtype = lookup_and_check_tag (enum_type, name,
10307 /*tag_scope=*/ts_current,
10308 /*template_header_p=*/false);
10310 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10312 error ("multiple definition of %q#T", enumtype);
10313 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10314 /* Clear out TYPE_VALUES, and start again. */
10315 TYPE_VALUES (enumtype) = NULL_TREE;
10319 /* In case of error, make a dummy enum to allow parsing to
10321 if (enumtype == error_mark_node)
10322 name = make_anon_name ();
10324 enumtype = make_node (ENUMERAL_TYPE);
10325 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10331 /* After processing and defining all the values of an enumeration type,
10332 install their decls in the enumeration type and finish it off.
10333 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10336 finish_enum (tree enumtype)
10345 bool use_short_enum;
10349 integer_type_kind itk;
10350 tree underlying_type = NULL_TREE;
10352 /* We built up the VALUES in reverse order. */
10353 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10355 /* For an enum defined in a template, just set the type of the values;
10356 all further processing is postponed until the template is
10357 instantiated. We need to set the type so that tsubst of a CONST_DECL
10359 if (processing_template_decl)
10361 for (values = TYPE_VALUES (enumtype);
10363 values = TREE_CHAIN (values))
10364 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10365 if (at_function_scope_p ())
10366 add_stmt (build_min (TAG_DEFN, enumtype));
10370 /* Determine the minimum and maximum values of the enumerators. */
10371 if (TYPE_VALUES (enumtype))
10373 minnode = maxnode = NULL_TREE;
10375 for (values = TYPE_VALUES (enumtype);
10377 values = TREE_CHAIN (values))
10379 decl = TREE_VALUE (values);
10381 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10382 each enumerator has the type of its enumeration. Prior to the
10383 closing brace, the type of each enumerator is the type of its
10384 initializing value. */
10385 TREE_TYPE (decl) = enumtype;
10387 /* Update the minimum and maximum values, if appropriate. */
10388 value = DECL_INITIAL (decl);
10389 if (value == error_mark_node)
10390 value = integer_zero_node;
10391 /* Figure out what the minimum and maximum values of the
10392 enumerators are. */
10394 minnode = maxnode = value;
10395 else if (tree_int_cst_lt (maxnode, value))
10397 else if (tree_int_cst_lt (value, minnode))
10404 If the enumerator-list is empty, the underlying type is as if
10405 the enumeration had a single enumerator with value 0. */
10406 minnode = maxnode = integer_zero_node;
10408 /* Compute the number of bits require to represent all values of the
10409 enumeration. We must do this before the type of MINNODE and
10410 MAXNODE are transformed, since min_precision relies on the
10411 TREE_TYPE of the value it is passed. */
10412 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10413 lowprec = min_precision (minnode, unsignedp);
10414 highprec = min_precision (maxnode, unsignedp);
10415 precision = MAX (lowprec, highprec);
10417 /* Determine the underlying type of the enumeration.
10421 The underlying type of an enumeration is an integral type that
10422 can represent all the enumerator values defined in the
10423 enumeration. It is implementation-defined which integral type is
10424 used as the underlying type for an enumeration except that the
10425 underlying type shall not be larger than int unless the value of
10426 an enumerator cannot fit in an int or unsigned int.
10428 We use "int" or an "unsigned int" as the underlying type, even if
10429 a smaller integral type would work, unless the user has
10430 explicitly requested that we use the smallest possible type. The
10431 user can request that for all enumerations with a command line
10432 flag, or for just one enumeration with an attribute. */
10434 use_short_enum = flag_short_enums
10435 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10437 for (itk = (use_short_enum ? itk_char : itk_int);
10441 underlying_type = integer_types[itk];
10442 if (TYPE_PRECISION (underlying_type) >= precision
10443 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10446 if (itk == itk_none)
10450 IF no integral type can represent all the enumerator values, the
10451 enumeration is ill-formed. */
10452 error ("no integral type can represent all of the enumerator values "
10453 "for %qT", enumtype);
10454 precision = TYPE_PRECISION (long_long_integer_type_node);
10455 underlying_type = integer_types[itk_unsigned_long_long];
10458 /* Compute the minium and maximum values for the type.
10462 For an enumeration where emin is the smallest enumerator and emax
10463 is the largest, the values of the enumeration are the values of the
10464 underlying type in the range bmin to bmax, where bmin and bmax are,
10465 respectively, the smallest and largest values of the smallest bit-
10466 field that can store emin and emax. */
10468 /* The middle-end currently assumes that types with TYPE_PRECISION
10469 narrower than their underlying type are suitably zero or sign
10470 extended to fill their mode. g++ doesn't make these guarantees.
10471 Until the middle-end can represent such paradoxical types, we
10472 set the TYPE_PRECISION to the width of the underlying type. */
10473 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10475 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10479 The value of sizeof() applied to an enumeration type, an object
10480 of an enumeration type, or an enumerator, is the value of sizeof()
10481 applied to the underlying type. */
10482 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10483 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10484 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10485 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10486 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10487 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10489 /* Convert each of the enumerators to the type of the underlying
10490 type of the enumeration. */
10491 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10493 location_t saved_location;
10495 decl = TREE_VALUE (values);
10496 saved_location = input_location;
10497 input_location = DECL_SOURCE_LOCATION (decl);
10498 value = perform_implicit_conversion (underlying_type,
10499 DECL_INITIAL (decl));
10500 input_location = saved_location;
10502 /* Do not clobber shared ints. */
10503 value = copy_node (value);
10505 TREE_TYPE (value) = enumtype;
10506 DECL_INITIAL (decl) = value;
10507 TREE_VALUE (values) = value;
10510 /* Fix up all variant types of this enum type. */
10511 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10513 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10514 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10515 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10516 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10517 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10518 TYPE_MODE (t) = TYPE_MODE (enumtype);
10519 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10520 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10521 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10522 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10525 /* Finish debugging output for this type. */
10526 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10529 /* Build and install a CONST_DECL for an enumeration constant of the
10530 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10531 Assignment of sequential values by default is handled here. */
10534 build_enumerator (tree name, tree value, tree enumtype)
10540 /* If the VALUE was erroneous, pretend it wasn't there; that will
10541 result in the enum being assigned the next value in sequence. */
10542 if (value == error_mark_node)
10545 /* Remove no-op casts from the value. */
10547 STRIP_TYPE_NOPS (value);
10549 if (! processing_template_decl)
10551 /* Validate and default VALUE. */
10552 if (value != NULL_TREE)
10554 value = integral_constant_value (value);
10556 if (TREE_CODE (value) == INTEGER_CST)
10558 value = perform_integral_promotions (value);
10559 constant_expression_warning (value);
10563 error ("enumerator value for %qD is not an integer constant", name);
10568 /* Default based on previous value. */
10569 if (value == NULL_TREE)
10571 if (TYPE_VALUES (enumtype))
10574 unsigned HOST_WIDE_INT lo;
10578 /* The next value is the previous value plus one. We can
10579 safely assume that the previous value is an INTEGER_CST.
10580 add_double doesn't know the type of the target expression,
10581 so we must check with int_fits_type_p as well. */
10582 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10583 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10584 TREE_INT_CST_HIGH (prev_value),
10586 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10587 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10591 error ("overflow in enumeration values at %qD", name);
10592 value = error_mark_node;
10596 value = integer_zero_node;
10599 /* Remove no-op casts from the value. */
10600 STRIP_TYPE_NOPS (value);
10603 /* C++ associates enums with global, function, or class declarations. */
10604 context = current_scope ();
10606 /* Build the actual enumeration constant. Note that the enumeration
10607 constants have the type of their initializers until the
10608 enumeration is complete:
10612 Following the closing brace of an enum-specifier, each enumer-
10613 ator has the type of its enumeration. Prior to the closing
10614 brace, the type of each enumerator is the type of its
10615 initializing value.
10617 In finish_enum we will reset the type. Of course, if we're
10618 processing a template, there may be no value. */
10619 type = value ? TREE_TYPE (value) : NULL_TREE;
10621 if (context && context == current_class_type)
10622 /* This enum declaration is local to the class. We need the full
10623 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10624 decl = build_lang_decl (CONST_DECL, name, type);
10626 /* It's a global enum, or it's local to a function. (Note local to
10627 a function could mean local to a class method. */
10628 decl = build_decl (CONST_DECL, name, type);
10630 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10631 TREE_CONSTANT (decl) = 1;
10632 TREE_INVARIANT (decl) = 1;
10633 TREE_READONLY (decl) = 1;
10634 DECL_INITIAL (decl) = value;
10636 if (context && context == current_class_type)
10637 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10638 on the TYPE_FIELDS list for `S'. (That's so that you can say
10639 things like `S::i' later.) */
10640 finish_member_declaration (decl);
10644 /* Add this enumeration constant to the list for this type. */
10645 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10649 /* We're defining DECL. Make sure that it's type is OK. */
10652 check_function_type (tree decl, tree current_function_parms)
10654 tree fntype = TREE_TYPE (decl);
10655 tree return_type = complete_type (TREE_TYPE (fntype));
10657 /* In a function definition, arg types must be complete. */
10658 require_complete_types_for_parms (current_function_parms);
10660 if (dependent_type_p (return_type))
10662 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10664 tree args = TYPE_ARG_TYPES (fntype);
10666 error ("return type %q#T is incomplete", return_type);
10668 /* Make it return void instead. */
10669 if (TREE_CODE (fntype) == METHOD_TYPE)
10670 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10672 TREE_CHAIN (args));
10674 fntype = build_function_type (void_type_node, args);
10676 = build_exception_variant (fntype,
10677 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10680 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10683 /* Create the FUNCTION_DECL for a function definition.
10684 DECLSPECS and DECLARATOR are the parts of the declaration;
10685 they describe the function's name and the type it returns,
10686 but twisted together in a fashion that parallels the syntax of C.
10688 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10689 DECLARATOR is really the DECL for the function we are about to
10690 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10691 indicating that the function is an inline defined in-class.
10693 This function creates a binding context for the function body
10694 as well as setting up the FUNCTION_DECL in current_function_decl.
10696 For C++, we must first check whether that datum makes any sense.
10697 For example, "class A local_a(1,2);" means that variable local_a
10698 is an aggregate of type A, which should have a constructor
10699 applied to it with the argument list [1, 2].
10701 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
10702 or may be a BLOCK if the function has been defined previously
10703 in this translation unit. On exit, DECL_INITIAL (decl1) will be
10704 error_mark_node if the function has never been defined, or
10705 a BLOCK if the function has been defined somewhere. */
10708 start_preparsed_function (tree decl1, tree attrs, int flags)
10710 tree ctype = NULL_TREE;
10713 int doing_friend = 0;
10714 struct cp_binding_level *bl;
10715 tree current_function_parms;
10716 struct c_fileinfo *finfo
10717 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
10718 bool honor_interface;
10720 /* Sanity check. */
10721 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10722 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10724 fntype = TREE_TYPE (decl1);
10725 if (TREE_CODE (fntype) == METHOD_TYPE)
10726 ctype = TYPE_METHOD_BASETYPE (fntype);
10728 /* ISO C++ 11.4/5. A friend function defined in a class is in
10729 the (lexical) scope of the class in which it is defined. */
10730 if (!ctype && DECL_FRIEND_P (decl1))
10732 ctype = DECL_FRIEND_CONTEXT (decl1);
10734 /* CTYPE could be null here if we're dealing with a template;
10735 for example, `inline friend float foo()' inside a template
10736 will have no CTYPE set. */
10737 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10743 if (DECL_DECLARED_INLINE_P (decl1)
10744 && lookup_attribute ("noinline", attrs))
10745 warning (0, "inline function %q+D given attribute noinline", decl1);
10747 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10748 /* This is a constructor, we must ensure that any default args
10749 introduced by this definition are propagated to the clones
10750 now. The clones are used directly in overload resolution. */
10751 adjust_clone_args (decl1);
10753 /* Sometimes we don't notice that a function is a static member, and
10754 build a METHOD_TYPE for it. Fix that up now. */
10755 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10756 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10758 revert_static_member_fn (decl1);
10762 /* Set up current_class_type, and enter the scope of the class, if
10765 push_nested_class (ctype);
10766 else if (DECL_STATIC_FUNCTION_P (decl1))
10767 push_nested_class (DECL_CONTEXT (decl1));
10769 /* Now that we have entered the scope of the class, we must restore
10770 the bindings for any template parameters surrounding DECL1, if it
10771 is an inline member template. (Order is important; consider the
10772 case where a template parameter has the same name as a field of
10773 the class.) It is not until after this point that
10774 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10775 if (flags & SF_INCLASS_INLINE)
10776 maybe_begin_member_template_processing (decl1);
10778 /* Effective C++ rule 15. */
10780 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10781 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10782 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
10784 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10785 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10786 if (!DECL_INITIAL (decl1))
10787 DECL_INITIAL (decl1) = error_mark_node;
10789 /* This function exists in static storage.
10790 (This does not mean `static' in the C sense!) */
10791 TREE_STATIC (decl1) = 1;
10793 /* We must call push_template_decl after current_class_type is set
10794 up. (If we are processing inline definitions after exiting a
10795 class scope, current_class_type will be NULL_TREE until set above
10796 by push_nested_class.) */
10797 if (processing_template_decl)
10799 /* FIXME: Handle error_mark_node more gracefully. */
10800 tree newdecl1 = push_template_decl (decl1);
10801 if (newdecl1 != error_mark_node)
10805 /* We are now in the scope of the function being defined. */
10806 current_function_decl = decl1;
10808 /* Save the parm names or decls from this function's declarator
10809 where store_parm_decls will find them. */
10810 current_function_parms = DECL_ARGUMENTS (decl1);
10812 /* Make sure the parameter and return types are reasonable. When
10813 you declare a function, these types can be incomplete, but they
10814 must be complete when you define the function. */
10815 check_function_type (decl1, current_function_parms);
10817 /* Build the return declaration for the function. */
10818 restype = TREE_TYPE (fntype);
10819 /* Promote the value to int before returning it. */
10820 if (c_promoting_integer_type_p (restype))
10821 restype = type_promotes_to (restype);
10822 if (DECL_RESULT (decl1) == NULL_TREE)
10826 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10827 DECL_ARTIFICIAL (resdecl) = 1;
10828 DECL_IGNORED_P (resdecl) = 1;
10829 DECL_RESULT (decl1) = resdecl;
10831 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10834 /* Let the user know we're compiling this function. */
10835 announce_function (decl1);
10837 /* Record the decl so that the function name is defined.
10838 If we already have a decl for this name, and it is a FUNCTION_DECL,
10839 use the old decl. */
10840 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10842 /* A specialization is not used to guide overload resolution. */
10843 if (!DECL_FUNCTION_MEMBER_P (decl1)
10844 && !(DECL_USE_TEMPLATE (decl1) &&
10845 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10847 tree olddecl = pushdecl (decl1);
10849 if (olddecl == error_mark_node)
10850 /* If something went wrong when registering the declaration,
10851 use DECL1; we have to have a FUNCTION_DECL to use when
10852 parsing the body of the function. */
10856 /* Otherwise, OLDDECL is either a previous declaration
10857 of the same function or DECL1 itself. */
10859 if (warn_missing_declarations
10860 && olddecl == decl1
10861 && !DECL_MAIN_P (decl1)
10862 && TREE_PUBLIC (decl1)
10863 && !DECL_DECLARED_INLINE_P (decl1))
10867 /* Check whether DECL1 is in an anonymous
10869 for (context = DECL_CONTEXT (decl1);
10871 context = DECL_CONTEXT (context))
10873 if (TREE_CODE (context) == NAMESPACE_DECL
10874 && DECL_NAME (context) == NULL_TREE)
10878 if (context == NULL)
10879 warning (OPT_Wmissing_declarations,
10880 "no previous declaration for %q+D", decl1);
10888 /* We need to set the DECL_CONTEXT. */
10889 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10890 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10892 fntype = TREE_TYPE (decl1);
10894 /* If #pragma weak applies, mark the decl appropriately now.
10895 The pragma only applies to global functions. Because
10896 determining whether or not the #pragma applies involves
10897 computing the mangled name for the declaration, we cannot
10898 apply the pragma until after we have merged this declaration
10899 with any previous declarations; if the original declaration
10900 has a linkage specification, that specification applies to
10901 the definition as well, and may affect the mangled name. */
10902 if (!DECL_CONTEXT (decl1))
10903 maybe_apply_pragma_weak (decl1);
10906 /* Reset this in case the call to pushdecl changed it. */
10907 current_function_decl = decl1;
10909 gcc_assert (DECL_INITIAL (decl1));
10911 /* This function may already have been parsed, in which case just
10912 return; our caller will skip over the body without parsing. */
10913 if (DECL_INITIAL (decl1) != error_mark_node)
10916 /* Initialize RTL machinery. We cannot do this until
10917 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10918 even when processing a template; this is how we get
10919 CFUN set up, and our per-function variables initialized.
10920 FIXME factor out the non-RTL stuff. */
10921 bl = current_binding_level;
10922 allocate_struct_function (decl1);
10923 current_binding_level = bl;
10925 /* Even though we're inside a function body, we still don't want to
10926 call expand_expr to calculate the size of a variable-sized array.
10927 We haven't necessarily assigned RTL to all variables yet, so it's
10928 not safe to try to expand expressions involving them. */
10929 cfun->x_dont_save_pending_sizes_p = 1;
10931 /* Start the statement-tree, start the tree now. */
10932 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10934 /* If we are (erroneously) defining a function that we have already
10935 defined before, wipe out what we knew before. */
10936 if (!DECL_PENDING_INLINE_P (decl1))
10937 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10939 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10941 /* We know that this was set up by `grokclassfn'. We do not
10942 wait until `store_parm_decls', since evil parse errors may
10943 never get us to that point. Here we keep the consistency
10944 between `current_class_type' and `current_class_ptr'. */
10945 tree t = DECL_ARGUMENTS (decl1);
10947 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10948 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10950 cp_function_chain->x_current_class_ref
10951 = build_indirect_ref (t, NULL);
10952 cp_function_chain->x_current_class_ptr = t;
10954 /* Constructors and destructors need to know whether they're "in
10955 charge" of initializing virtual base classes. */
10956 t = TREE_CHAIN (t);
10957 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10959 current_in_charge_parm = t;
10960 t = TREE_CHAIN (t);
10962 if (DECL_HAS_VTT_PARM_P (decl1))
10964 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
10965 current_vtt_parm = t;
10969 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
10970 /* Implicitly-defined methods (like the
10971 destructor for a class in which no destructor
10972 is explicitly declared) must not be defined
10973 until their definition is needed. So, we
10974 ignore interface specifications for
10975 compiler-generated functions. */
10976 && !DECL_ARTIFICIAL (decl1));
10978 if (DECL_INTERFACE_KNOWN (decl1))
10980 tree ctx = decl_function_context (decl1);
10982 if (DECL_NOT_REALLY_EXTERN (decl1))
10983 DECL_EXTERNAL (decl1) = 0;
10985 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
10986 && TREE_PUBLIC (ctx))
10987 /* This is a function in a local class in an extern inline
10989 comdat_linkage (decl1);
10991 /* If this function belongs to an interface, it is public.
10992 If it belongs to someone else's interface, it is also external.
10993 This only affects inlines and template instantiations. */
10994 else if (!finfo->interface_unknown && honor_interface)
10996 if (DECL_DECLARED_INLINE_P (decl1)
10997 || DECL_TEMPLATE_INSTANTIATION (decl1)
10998 || processing_template_decl)
11000 DECL_EXTERNAL (decl1)
11001 = (finfo->interface_only
11002 || (DECL_DECLARED_INLINE_P (decl1)
11003 && ! flag_implement_inlines
11004 && !DECL_VINDEX (decl1)));
11006 /* For WIN32 we also want to put these in linkonce sections. */
11007 maybe_make_one_only (decl1);
11010 DECL_EXTERNAL (decl1) = 0;
11011 DECL_INTERFACE_KNOWN (decl1) = 1;
11012 /* If this function is in an interface implemented in this file,
11013 make sure that the back end knows to emit this function
11015 if (!DECL_EXTERNAL (decl1))
11016 mark_needed (decl1);
11018 else if (finfo->interface_unknown && finfo->interface_only
11019 && honor_interface)
11021 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11022 interface, we will have both finfo->interface_unknown and
11023 finfo->interface_only set. In that case, we don't want to
11024 use the normal heuristics because someone will supply a
11025 #pragma implementation elsewhere, and deducing it here would
11026 produce a conflict. */
11027 comdat_linkage (decl1);
11028 DECL_EXTERNAL (decl1) = 0;
11029 DECL_INTERFACE_KNOWN (decl1) = 1;
11030 DECL_DEFER_OUTPUT (decl1) = 1;
11034 /* This is a definition, not a reference.
11035 So clear DECL_EXTERNAL. */
11036 DECL_EXTERNAL (decl1) = 0;
11038 if ((DECL_DECLARED_INLINE_P (decl1)
11039 || DECL_TEMPLATE_INSTANTIATION (decl1))
11040 && ! DECL_INTERFACE_KNOWN (decl1)
11041 /* Don't try to defer nested functions for now. */
11042 && ! decl_function_context (decl1))
11043 DECL_DEFER_OUTPUT (decl1) = 1;
11045 DECL_INTERFACE_KNOWN (decl1) = 1;
11048 /* Determine the ELF visibility attribute for the function. We must not
11049 do this before calling "pushdecl", as we must allow "duplicate_decls"
11050 to merge any attributes appropriately. We also need to wait until
11052 if (!DECL_CLONED_FUNCTION_P (decl1))
11053 determine_visibility (decl1);
11055 begin_scope (sk_function_parms, decl1);
11059 if (DECL_DESTRUCTOR_P (decl1)
11060 || (DECL_CONSTRUCTOR_P (decl1)
11061 && targetm.cxx.cdtor_returns_this ()))
11063 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11064 DECL_CONTEXT (cdtor_label) = current_function_decl;
11067 start_fname_decls ();
11069 store_parm_decls (current_function_parms);
11073 /* Like start_preparsed_function, except that instead of a
11074 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11076 Returns 1 on success. If the DECLARATOR is not suitable for a function
11077 (it defines a datum instead), we return 0, which tells
11078 yyparse to report a parse error. */
11081 start_function (cp_decl_specifier_seq *declspecs,
11082 const cp_declarator *declarator,
11087 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11088 /* If the declarator is not suitable for a function definition,
11089 cause a syntax error. */
11090 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11093 if (DECL_MAIN_P (decl1))
11094 /* main must return int. grokfndecl should have corrected it
11095 (and issued a diagnostic) if the user got it wrong. */
11096 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11097 integer_type_node));
11099 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11104 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11108 use_eh_spec_block (tree fn)
11110 return (flag_exceptions && flag_enforce_eh_specs
11111 && !processing_template_decl
11112 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11113 /* We insert the EH_SPEC_BLOCK only in the original
11114 function; then, it is copied automatically to the
11116 && !DECL_CLONED_FUNCTION_P (fn)
11117 /* Implicitly-generated constructors and destructors have
11118 exception specifications. However, those specifications
11119 are the union of the possible exceptions specified by the
11120 constructors/destructors for bases and members, so no
11121 unallowed exception will ever reach this function. By
11122 not creating the EH_SPEC_BLOCK we save a little memory,
11123 and we avoid spurious warnings about unreachable
11125 && !DECL_ARTIFICIAL (fn));
11128 /* Store the parameter declarations into the current function declaration.
11129 This is called after parsing the parameter declarations, before
11130 digesting the body of the function.
11132 Also install to binding contour return value identifier, if any. */
11135 store_parm_decls (tree current_function_parms)
11137 tree fndecl = current_function_decl;
11140 /* This is a chain of any other decls that came in among the parm
11141 declarations. If a parm is declared with enum {foo, bar} x;
11142 then CONST_DECLs for foo and bar are put here. */
11143 tree nonparms = NULL_TREE;
11145 if (current_function_parms)
11147 /* This case is when the function was defined with an ANSI prototype.
11148 The parms already have decls, so we need not do anything here
11149 except record them as in effect
11150 and complain if any redundant old-style parm decls were written. */
11152 tree specparms = current_function_parms;
11155 /* Must clear this because it might contain TYPE_DECLs declared
11157 current_binding_level->names = NULL;
11159 /* If we're doing semantic analysis, then we'll call pushdecl
11160 for each of these. We must do them in reverse order so that
11161 they end in the correct forward order. */
11162 specparms = nreverse (specparms);
11164 for (parm = specparms; parm; parm = next)
11166 next = TREE_CHAIN (parm);
11167 if (TREE_CODE (parm) == PARM_DECL)
11169 if (DECL_NAME (parm) == NULL_TREE
11170 || TREE_CODE (parm) != VOID_TYPE)
11173 error ("parameter %qD declared void", parm);
11177 /* If we find an enum constant or a type tag,
11178 put it aside for the moment. */
11179 TREE_CHAIN (parm) = NULL_TREE;
11180 nonparms = chainon (nonparms, parm);
11184 /* Get the decls in their original chain order and record in the
11185 function. This is all and only the PARM_DECLs that were
11186 pushed into scope by the loop above. */
11187 DECL_ARGUMENTS (fndecl) = getdecls ();
11190 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11192 /* Now store the final chain of decls for the arguments
11193 as the decl-chain of the current lexical scope.
11194 Put the enumerators in as well, at the front so that
11195 DECL_ARGUMENTS is not modified. */
11196 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11198 if (use_eh_spec_block (current_function_decl))
11199 current_eh_spec_block = begin_eh_spec_block ();
11203 /* We have finished doing semantic analysis on DECL, but have not yet
11204 generated RTL for its body. Save away our current state, so that
11205 when we want to generate RTL later we know what to do. */
11208 save_function_data (tree decl)
11210 struct language_function *f;
11212 /* Save the language-specific per-function data so that we can
11213 get it back when we really expand this function. */
11214 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11217 f = GGC_NEW (struct language_function);
11218 memcpy (f, cp_function_chain, sizeof (struct language_function));
11219 DECL_SAVED_FUNCTION_DATA (decl) = f;
11221 /* Clear out the bits we don't need. */
11222 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11223 f->bindings = NULL;
11224 f->x_local_names = NULL;
11228 /* Set the return value of the constructor (if present). */
11231 finish_constructor_body (void)
11236 if (targetm.cxx.cdtor_returns_this ())
11238 /* Any return from a constructor will end up here. */
11239 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11241 val = DECL_ARGUMENTS (current_function_decl);
11242 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11243 DECL_RESULT (current_function_decl), val);
11244 /* Return the address of the object. */
11245 exprstmt = build_stmt (RETURN_EXPR, val);
11246 add_stmt (exprstmt);
11250 /* Do all the processing for the beginning of a destructor; set up the
11251 vtable pointers and cleanups for bases and members. */
11254 begin_destructor_body (void)
11256 tree compound_stmt;
11258 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11259 issued an error message. We still want to try to process the
11260 body of the function, but initialize_vtbl_ptrs will crash if
11261 TYPE_BINFO is NULL. */
11262 if (COMPLETE_TYPE_P (current_class_type))
11264 compound_stmt = begin_compound_stmt (0);
11265 /* Make all virtual function table pointers in non-virtual base
11266 classes point to CURRENT_CLASS_TYPE's virtual function
11268 initialize_vtbl_ptrs (current_class_ptr);
11269 finish_compound_stmt (compound_stmt);
11271 /* And insert cleanups for our bases and members so that they
11272 will be properly destroyed if we throw. */
11273 push_base_cleanups ();
11277 /* At the end of every destructor we generate code to delete the object if
11278 necessary. Do that now. */
11281 finish_destructor_body (void)
11285 /* Any return from a destructor will end up here; that way all base
11286 and member cleanups will be run when the function returns. */
11287 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11289 /* In a virtual destructor, we must call delete. */
11290 if (DECL_VIRTUAL_P (current_function_decl))
11293 tree virtual_size = cxx_sizeof (current_class_type);
11297 At the point of definition of a virtual destructor (including
11298 an implicit definition), non-placement operator delete shall
11299 be looked up in the scope of the destructor's class and if
11300 found shall be accessible and unambiguous. */
11301 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11303 /*global_p=*/false,
11304 /*placement=*/NULL_TREE,
11305 /*alloc_fn=*/NULL_TREE);
11307 if_stmt = begin_if_stmt ();
11308 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11309 current_in_charge_parm,
11312 finish_expr_stmt (exprstmt);
11313 finish_then_clause (if_stmt);
11314 finish_if_stmt (if_stmt);
11317 if (targetm.cxx.cdtor_returns_this ())
11321 val = DECL_ARGUMENTS (current_function_decl);
11322 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11323 DECL_RESULT (current_function_decl), val);
11324 /* Return the address of the object. */
11325 exprstmt = build_stmt (RETURN_EXPR, val);
11326 add_stmt (exprstmt);
11330 /* Do the necessary processing for the beginning of a function body, which
11331 in this case includes member-initializers, but not the catch clauses of
11332 a function-try-block. Currently, this means opening a binding level
11333 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11336 begin_function_body (void)
11340 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11343 if (processing_template_decl)
11344 /* Do nothing now. */;
11346 /* Always keep the BLOCK node associated with the outermost pair of
11347 curly braces of a function. These are needed for correct
11348 operation of dwarfout.c. */
11349 keep_next_level (true);
11351 stmt = begin_compound_stmt (BCS_FN_BODY);
11353 if (processing_template_decl)
11354 /* Do nothing now. */;
11355 else if (DECL_DESTRUCTOR_P (current_function_decl))
11356 begin_destructor_body ();
11361 /* Do the processing for the end of a function body. Currently, this means
11362 closing out the cleanups for fully-constructed bases and members, and in
11363 the case of the destructor, deleting the object if desired. Again, this
11364 is only meaningful for [cd]tors, since they are the only functions where
11365 there is a significant distinction between the main body and any
11366 function catch clauses. Handling, say, main() return semantics here
11367 would be wrong, as flowing off the end of a function catch clause for
11368 main() would also need to return 0. */
11371 finish_function_body (tree compstmt)
11373 if (compstmt == NULL_TREE)
11376 /* Close the block. */
11377 finish_compound_stmt (compstmt);
11379 if (processing_template_decl)
11380 /* Do nothing now. */;
11381 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11382 finish_constructor_body ();
11383 else if (DECL_DESTRUCTOR_P (current_function_decl))
11384 finish_destructor_body ();
11387 /* Given a function, returns the BLOCK corresponding to the outermost level
11388 of curly braces, skipping the artificial block created for constructor
11392 outer_curly_brace_block (tree fndecl)
11394 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11395 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11396 /* Skip the artificial function body block. */
11397 block = BLOCK_SUBBLOCKS (block);
11401 /* Finish up a function declaration and compile that function
11402 all the way to assembler language output. The free the storage
11403 for the function definition.
11405 FLAGS is a bitwise or of the following values:
11407 We just finished processing the body of an in-class inline
11408 function definition. (This processing will have taken place
11409 after the class definition is complete.) */
11412 finish_function (int flags)
11414 tree fndecl = current_function_decl;
11415 tree fntype, ctype = NULL_TREE;
11416 int inclass_inline = (flags & 2) != 0;
11419 /* When we get some parse errors, we can end up without a
11420 current_function_decl, so cope. */
11421 if (fndecl == NULL_TREE)
11422 return error_mark_node;
11424 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11425 && DECL_VIRTUAL_P (fndecl)
11426 && !processing_template_decl)
11428 tree fnclass = DECL_CONTEXT (fndecl);
11429 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11430 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11433 nested = function_depth > 1;
11434 fntype = TREE_TYPE (fndecl);
11436 /* TREE_READONLY (fndecl) = 1;
11437 This caused &foo to be of type ptr-to-const-function
11438 which then got a warning when stored in a ptr-to-function variable. */
11440 gcc_assert (building_stmt_tree ());
11441 /* The current function is being defined, so its DECL_INITIAL should
11442 be set, and unless there's a multiple definition, it should be
11443 error_mark_node. */
11444 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11446 /* For a cloned function, we've already got all the code we need;
11447 there's no need to add any extra bits. */
11448 if (!DECL_CLONED_FUNCTION_P (fndecl))
11450 if (DECL_MAIN_P (current_function_decl))
11454 /* Make it so that `main' always returns 0 by default (or
11457 stmt = finish_return_stmt (integer_one_node);
11459 stmt = finish_return_stmt (integer_zero_node);
11461 /* Hack. We don't want the middle-end to warn that this
11462 return is unreachable, so put the statement on the
11464 #ifdef USE_MAPPED_LOCATION
11465 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
11467 annotate_with_file_line (stmt, input_filename, 0);
11471 if (use_eh_spec_block (current_function_decl))
11472 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11473 (TREE_TYPE (current_function_decl)),
11474 current_eh_spec_block);
11477 /* If we're saving up tree structure, tie off the function now. */
11478 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11480 finish_fname_decls ();
11482 /* If this function can't throw any exceptions, remember that. */
11483 if (!processing_template_decl
11484 && !cp_function_chain->can_throw
11485 && !flag_non_call_exceptions
11486 && !DECL_REPLACEABLE_P (fndecl))
11487 TREE_NOTHROW (fndecl) = 1;
11489 /* This must come after expand_function_end because cleanups might
11490 have declarations (from inline functions) that need to go into
11491 this function's blocks. */
11493 /* If the current binding level isn't the outermost binding level
11494 for this function, either there is a bug, or we have experienced
11495 syntax errors and the statement tree is malformed. */
11496 if (current_binding_level->kind != sk_function_parms)
11498 /* Make sure we have already experienced errors. */
11499 gcc_assert (errorcount);
11501 /* Throw away the broken statement tree and extra binding
11503 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11505 while (current_binding_level->kind != sk_function_parms)
11507 if (current_binding_level->kind == sk_class)
11508 pop_nested_class ();
11510 poplevel (0, 0, 0);
11513 poplevel (1, 0, 1);
11515 /* Statements should always be full-expressions at the outermost set
11516 of curly braces for a function. */
11517 gcc_assert (stmts_are_full_exprs_p ());
11519 /* Set up the named return value optimization, if we can. Candidate
11520 variables are selected in check_return_value. */
11521 if (current_function_return_value)
11523 tree r = current_function_return_value;
11526 if (r != error_mark_node
11527 /* This is only worth doing for fns that return in memory--and
11528 simpler, since we don't have to worry about promoted modes. */
11529 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11530 /* Only allow this for variables declared in the outer scope of
11531 the function so we know that their lifetime always ends with a
11532 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11533 we were to do this optimization in tree-ssa. */
11534 && (outer = outer_curly_brace_block (fndecl))
11535 && chain_member (r, BLOCK_VARS (outer)))
11536 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11538 current_function_return_value = NULL_TREE;
11541 /* Remember that we were in class scope. */
11542 if (current_class_name)
11543 ctype = current_class_type;
11545 /* Must mark the RESULT_DECL as being in this function. */
11546 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11548 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11549 to the FUNCTION_DECL node itself. */
11550 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11552 /* Save away current state, if appropriate. */
11553 if (!processing_template_decl)
11554 save_function_data (fndecl);
11556 /* Complain if there's just no return statement. */
11557 if (warn_return_type
11558 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11559 && !dependent_type_p (TREE_TYPE (fntype))
11560 && !current_function_returns_value && !current_function_returns_null
11561 /* Don't complain if we abort or throw. */
11562 && !current_function_returns_abnormally
11563 && !DECL_NAME (DECL_RESULT (fndecl))
11564 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11565 inline function, as we might never be compiled separately. */
11566 && (DECL_INLINE (fndecl) || processing_template_decl)
11567 /* Structor return values (if any) are set by the compiler. */
11568 && !DECL_CONSTRUCTOR_P (fndecl)
11569 && !DECL_DESTRUCTOR_P (fndecl))
11570 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11572 /* Store the end of the function, so that we get good line number
11573 info for the epilogue. */
11574 cfun->function_end_locus = input_location;
11576 /* Genericize before inlining. */
11577 if (!processing_template_decl)
11579 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11580 cp_genericize (fndecl);
11581 /* Clear out the bits we don't need. */
11582 f->x_current_class_ptr = NULL;
11583 f->x_current_class_ref = NULL;
11584 f->x_eh_spec_block = NULL;
11585 f->x_in_charge_parm = NULL;
11586 f->x_vtt_parm = NULL;
11587 f->x_return_value = NULL;
11588 f->bindings = NULL;
11589 f->extern_decl_map = NULL;
11591 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11592 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11594 /* Clear out the bits we don't need. */
11595 local_names = NULL;
11597 /* We're leaving the context of this function, so zap cfun. It's still in
11598 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11600 current_function_decl = NULL;
11602 /* If this is an in-class inline definition, we may have to pop the
11603 bindings for the template parameters that we added in
11604 maybe_begin_member_template_processing when start_function was
11606 if (inclass_inline)
11607 maybe_end_member_template_processing ();
11609 /* Leave the scope of the class. */
11611 pop_nested_class ();
11617 /* Let the error reporting routines know that we're outside a
11618 function. For a nested function, this value is used in
11619 cxx_pop_function_context and then reset via pop_function_context. */
11620 current_function_decl = NULL_TREE;
11625 /* Create the FUNCTION_DECL for a function definition.
11626 DECLSPECS and DECLARATOR are the parts of the declaration;
11627 they describe the return type and the name of the function,
11628 but twisted together in a fashion that parallels the syntax of C.
11630 This function creates a binding context for the function body
11631 as well as setting up the FUNCTION_DECL in current_function_decl.
11633 Returns a FUNCTION_DECL on success.
11635 If the DECLARATOR is not suitable for a function (it defines a datum
11636 instead), we return 0, which tells yyparse to report a parse error.
11638 May return void_type_node indicating that this method is actually
11639 a friend. See grokfield for more details.
11641 Came here with a `.pushlevel' .
11643 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11644 CHANGES TO CODE IN `grokfield'. */
11647 start_method (cp_decl_specifier_seq *declspecs,
11648 const cp_declarator *declarator, tree attrlist)
11650 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
11653 if (fndecl == error_mark_node)
11654 return error_mark_node;
11656 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
11658 error ("invalid member function declaration");
11659 return error_mark_node;
11663 cplus_decl_attributes (&fndecl, attrlist, 0);
11665 /* Pass friends other than inline friend functions back. */
11666 if (fndecl == void_type_node)
11669 if (DECL_IN_AGGR_P (fndecl))
11671 if (DECL_CONTEXT (fndecl)
11672 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
11673 error ("%qD is already defined in class %qT", fndecl,
11674 DECL_CONTEXT (fndecl));
11675 return error_mark_node;
11678 check_template_shadow (fndecl);
11680 DECL_DECLARED_INLINE_P (fndecl) = 1;
11681 if (flag_default_inline)
11682 DECL_INLINE (fndecl) = 1;
11684 /* We process method specializations in finish_struct_1. */
11685 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11687 fndecl = push_template_decl (fndecl);
11688 if (fndecl == error_mark_node)
11692 if (! DECL_FRIEND_P (fndecl))
11694 if (TREE_CHAIN (fndecl))
11696 fndecl = copy_node (fndecl);
11697 TREE_CHAIN (fndecl) = NULL_TREE;
11701 finish_decl (fndecl, NULL_TREE, NULL_TREE);
11703 /* Make a place for the parms. */
11704 begin_scope (sk_function_parms, fndecl);
11706 DECL_IN_AGGR_P (fndecl) = 1;
11710 /* Go through the motions of finishing a function definition.
11711 We don't compile this method until after the whole class has
11714 FINISH_METHOD must return something that looks as though it
11715 came from GROKFIELD (since we are defining a method, after all).
11717 This is called after parsing the body of the function definition.
11718 STMTS is the chain of statements that makes up the function body.
11720 DECL is the ..._DECL that `start_method' provided. */
11723 finish_method (tree decl)
11725 tree fndecl = decl;
11730 if (decl == void_type_node)
11733 old_initial = DECL_INITIAL (fndecl);
11735 /* Undo the level for the parms (from start_method).
11736 This is like poplevel, but it causes nothing to be
11737 saved. Saving information here confuses symbol-table
11738 output routines. Besides, this information will
11739 be correctly output when this method is actually
11742 /* Clear out the meanings of the local variables of this level;
11743 also record in each decl which block it belongs to. */
11745 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11747 if (DECL_NAME (link) != NULL_TREE)
11748 pop_binding (DECL_NAME (link), link);
11749 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11750 DECL_CONTEXT (link) = NULL_TREE;
11753 poplevel (0, 0, 0);
11755 DECL_INITIAL (fndecl) = old_initial;
11757 /* We used to check if the context of FNDECL was different from
11758 current_class_type as another way to get inside here. This didn't work
11759 for String.cc in libg++. */
11760 if (DECL_FRIEND_P (fndecl))
11762 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11764 decl = void_type_node;
11771 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11772 we can lay it out later, when and if its type becomes complete. */
11775 maybe_register_incomplete_var (tree var)
11777 gcc_assert (TREE_CODE (var) == VAR_DECL);
11779 /* Keep track of variables with incomplete types. */
11780 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11781 && DECL_EXTERNAL (var))
11783 tree inner_type = TREE_TYPE (var);
11785 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11786 inner_type = TREE_TYPE (inner_type);
11787 inner_type = TYPE_MAIN_VARIANT (inner_type);
11789 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11790 /* RTTI TD entries are created while defining the type_info. */
11791 || (TYPE_LANG_SPECIFIC (inner_type)
11792 && TYPE_BEING_DEFINED (inner_type)))
11793 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11797 /* Called when a class type (given by TYPE) is defined. If there are
11798 any existing VAR_DECLs whose type hsa been completed by this
11799 declaration, update them now. */
11802 complete_vars (tree type)
11804 tree *list = &incomplete_vars;
11806 gcc_assert (CLASS_TYPE_P (type));
11809 if (same_type_p (type, TREE_PURPOSE (*list)))
11811 tree var = TREE_VALUE (*list);
11812 tree type = TREE_TYPE (var);
11813 /* Complete the type of the variable. The VAR_DECL itself
11814 will be laid out in expand_expr. */
11815 complete_type (type);
11816 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11817 /* Remove this entry from the list. */
11818 *list = TREE_CHAIN (*list);
11821 list = &TREE_CHAIN (*list);
11824 /* Check for pending declarations which may have abstract type. */
11825 complete_type_check_abstract (type);
11828 /* If DECL is of a type which needs a cleanup, build and return an
11829 expression to perform that cleanup here. Return NULL_TREE if no
11830 cleanup need be done. */
11833 cxx_maybe_build_cleanup (tree decl)
11839 /* Assume no cleanup is required. */
11840 cleanup = NULL_TREE;
11842 if (error_operand_p (decl))
11845 /* Handle "__attribute__((cleanup))". We run the cleanup function
11846 before the destructor since the destructor is what actually
11847 terminates the lifetime of the object. */
11848 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
11855 /* Get the name specified by the user for the cleanup function. */
11856 id = TREE_VALUE (TREE_VALUE (attr));
11857 /* Look up the name to find the cleanup function to call. It is
11858 important to use lookup_name here because that is what is
11859 used in c-common.c:handle_cleanup_attribute when performing
11860 initial checks on the attribute. Note that those checks
11861 include ensuring that the function found is not an overloaded
11862 function, or an object with an overloaded call operator,
11863 etc.; we can rely on the fact that the functionfound is an
11864 ordinary FUNCTION_DECL. */
11865 fn = lookup_name (id);
11866 arg = build_address (decl);
11868 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
11871 /* Handle ordinary C++ destructors. */
11872 type = TREE_TYPE (decl);
11873 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11875 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11876 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11877 && CLASSTYPE_VBASECLASSES (type));
11881 if (TREE_CODE (type) == ARRAY_TYPE)
11885 cxx_mark_addressable (decl);
11886 addr = build_unary_op (ADDR_EXPR, decl, 0);
11889 /* Optimize for space over speed here. */
11890 if (!has_vbases || flag_expensive_optimizations)
11891 flags |= LOOKUP_NONVIRTUAL;
11893 call = build_delete (TREE_TYPE (addr), addr,
11894 sfk_complete_destructor, flags, 0);
11896 cleanup = build_compound_expr (cleanup, call);
11904 /* When a stmt has been parsed, this function is called. */
11911 /* DECL was originally constructed as a non-static member function,
11912 but turned out to be static. Update it accordingly. */
11915 revert_static_member_fn (tree decl)
11918 tree function = TREE_TYPE (decl);
11919 tree args = TYPE_ARG_TYPES (function);
11921 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11922 != TYPE_UNQUALIFIED)
11923 error ("static member function %q#D declared with type qualifiers", decl);
11925 args = TREE_CHAIN (args);
11926 tmp = build_function_type (TREE_TYPE (function), args);
11927 tmp = build_qualified_type (tmp, cp_type_quals (function));
11928 tmp = build_exception_variant (tmp,
11929 TYPE_RAISES_EXCEPTIONS (function));
11930 TREE_TYPE (decl) = tmp;
11931 if (DECL_ARGUMENTS (decl))
11932 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11933 DECL_STATIC_FUNCTION_P (decl) = 1;
11936 /* Initialize the variables used during compilation of a C++
11940 cxx_push_function_context (struct function * f)
11942 struct language_function *p = GGC_CNEW (struct language_function);
11945 /* Whenever we start a new function, we destroy temporaries in the
11947 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11953 if (DECL_SAVED_FUNCTION_DATA (fn))
11955 /* If we already parsed this function, and we're just expanding it
11956 now, restore saved state. */
11957 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11959 /* We don't need the saved data anymore. Unless this is an inline
11960 function; we need the named return value info for
11961 declare_return_variable. */
11962 if (! DECL_INLINE (fn))
11963 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
11968 /* Free the language-specific parts of F, now that we've finished
11969 compiling the function. */
11972 cxx_pop_function_context (struct function * f)
11977 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
11978 one of the language-independent trees. */
11980 enum cp_tree_node_structure_enum
11981 cp_tree_node_structure (union lang_tree_node * t)
11983 switch (TREE_CODE (&t->generic))
11985 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
11986 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
11987 case OVERLOAD: return TS_CP_OVERLOAD;
11988 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
11989 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
11990 case PTRMEM_CST: return TS_CP_PTRMEM;
11991 case BASELINK: return TS_CP_BASELINK;
11992 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
11993 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
11994 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
11995 default: return TS_CP_GENERIC;
11999 /* Build the void_list_node (void_type_node having been created). */
12001 build_void_list_node (void)
12003 tree t = build_tree_list (NULL_TREE, void_type_node);
12008 cp_missing_noreturn_ok_p (tree decl)
12010 /* A missing noreturn is ok for the `main' function. */
12011 return DECL_MAIN_P (decl);
12014 /* Return the COMDAT group into which DECL should be placed. */
12017 cxx_comdat_group (tree decl)
12021 /* Virtual tables, construction virtual tables, and virtual table
12022 tables all go in a single COMDAT group, named after the primary
12024 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12025 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12026 /* For all other DECLs, the COMDAT group is the mangled name of the
12027 declaration itself. */
12030 while (DECL_THUNK_P (decl))
12032 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12033 into the same section as the target function. In that case
12034 we must return target's name. */
12035 tree target = THUNK_TARGET (decl);
12036 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12037 && DECL_SECTION_NAME (target) != NULL
12038 && DECL_ONE_ONLY (target))
12043 name = DECL_ASSEMBLER_NAME (decl);
12046 return IDENTIFIER_POINTER (name);
12049 #include "gt-cp-decl.h"