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, 2008
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
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, bool);
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 /* To avoid unwanted recursion, finish_function defers all mark_used calls
231 encountered during its execution until it finishes. */
232 bool defer_mark_used_calls;
233 VEC(tree, gc) *deferred_mark_used_calls;
235 /* States indicating how grokdeclarator() should handle declspecs marked
236 with __attribute__((deprecated)). An object declared as
237 __attribute__((deprecated)) suppresses warnings of uses of other
240 enum deprecated_states {
245 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
248 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
249 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
250 time the VAR_DECL was declared, the type was incomplete. */
252 static GTY(()) tree incomplete_vars;
254 /* Returns the kind of template specialization we are currently
255 processing, given that it's declaration contained N_CLASS_SCOPES
256 explicit scope qualifications. */
259 current_tmpl_spec_kind (int n_class_scopes)
261 int n_template_parm_scopes = 0;
262 int seen_specialization_p = 0;
263 int innermost_specialization_p = 0;
264 struct cp_binding_level *b;
266 /* Scan through the template parameter scopes. */
267 for (b = current_binding_level;
268 b->kind == sk_template_parms;
271 /* If we see a specialization scope inside a parameter scope,
272 then something is wrong. That corresponds to a declaration
275 template <class T> template <> ...
277 which is always invalid since [temp.expl.spec] forbids the
278 specialization of a class member template if the enclosing
279 class templates are not explicitly specialized as well. */
280 if (b->explicit_spec_p)
282 if (n_template_parm_scopes == 0)
283 innermost_specialization_p = 1;
285 seen_specialization_p = 1;
287 else if (seen_specialization_p == 1)
288 return tsk_invalid_member_spec;
290 ++n_template_parm_scopes;
293 /* Handle explicit instantiations. */
294 if (processing_explicit_instantiation)
296 if (n_template_parm_scopes != 0)
297 /* We've seen a template parameter list during an explicit
298 instantiation. For example:
300 template <class T> template void f(int);
302 This is erroneous. */
303 return tsk_invalid_expl_inst;
305 return tsk_expl_inst;
308 if (n_template_parm_scopes < n_class_scopes)
309 /* We've not seen enough template headers to match all the
310 specialized classes present. For example:
312 template <class T> void R<T>::S<T>::f(int);
314 This is invalid; there needs to be one set of template
315 parameters for each class. */
316 return tsk_insufficient_parms;
317 else if (n_template_parm_scopes == n_class_scopes)
318 /* We're processing a non-template declaration (even though it may
319 be a member of a template class.) For example:
321 template <class T> void S<T>::f(int);
323 The `class T' matches the `S<T>', leaving no template headers
324 corresponding to the `f'. */
326 else if (n_template_parm_scopes > n_class_scopes + 1)
327 /* We've got too many template headers. For example:
329 template <> template <class T> void f (T);
331 There need to be more enclosing classes. */
332 return tsk_excessive_parms;
334 /* This must be a template. It's of the form:
336 template <class T> template <class U> void S<T>::f(U);
338 This is a specialization if the innermost level was a
339 specialization; otherwise it's just a definition of the
341 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
344 /* Exit the current scope. */
352 /* When a label goes out of scope, check to see if that label was used
353 in a valid manner, and issue any appropriate warnings or errors. */
356 pop_label (tree label, tree old_value)
358 if (!processing_template_decl)
360 if (DECL_INITIAL (label) == NULL_TREE)
364 error ("label %q+D used but not defined", label);
365 location = input_location; /* FIXME want (input_filename, (line)0) */
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 = BLOCK_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 name_space, walk_namespaces_fn f, void* data)
811 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
813 result |= (*f) (name_space, 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 name_space, void* data)
837 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
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 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1064 permerror (input_location, "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 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1103 && lookup_attribute ("gnu_inline", \
1104 DECL_ATTRIBUTES (fn)))
1106 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1107 If the redeclaration is invalid, a diagnostic is issued, and the
1108 error_mark_node is returned. Otherwise, OLDDECL is returned.
1110 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1113 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1116 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1118 unsigned olddecl_uid = DECL_UID (olddecl);
1119 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1120 int new_defines_function = 0;
1123 if (newdecl == olddecl)
1126 types_match = decls_match (newdecl, olddecl);
1128 /* If either the type of the new decl or the type of the old decl is an
1129 error_mark_node, then that implies that we have already issued an
1130 error (earlier) for some bogus type specification, and in that case,
1131 it is rather pointless to harass the user with yet more error message
1132 about the same declaration, so just pretend the types match here. */
1133 if (TREE_TYPE (newdecl) == error_mark_node
1134 || TREE_TYPE (olddecl) == error_mark_node)
1135 return error_mark_node;
1137 if (DECL_P (olddecl)
1138 && TREE_CODE (newdecl) == FUNCTION_DECL
1139 && TREE_CODE (olddecl) == FUNCTION_DECL
1140 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1142 if (DECL_DECLARED_INLINE_P (newdecl)
1143 && DECL_UNINLINABLE (newdecl)
1144 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1145 /* Already warned elsewhere. */;
1146 else if (DECL_DECLARED_INLINE_P (olddecl)
1147 && DECL_UNINLINABLE (olddecl)
1148 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1149 /* Already warned. */;
1150 else if (DECL_DECLARED_INLINE_P (newdecl)
1151 && DECL_UNINLINABLE (olddecl)
1152 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1154 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1156 warning (OPT_Wattributes, "previous declaration of %q+D "
1157 "with attribute noinline", olddecl);
1159 else if (DECL_DECLARED_INLINE_P (olddecl)
1160 && DECL_UNINLINABLE (newdecl)
1161 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1163 warning (OPT_Wattributes, "function %q+D redeclared with "
1164 "attribute noinline", newdecl);
1165 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1170 /* Check for redeclaration and other discrepancies. */
1171 if (TREE_CODE (olddecl) == FUNCTION_DECL
1172 && DECL_ARTIFICIAL (olddecl))
1174 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1175 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1177 /* Avoid warnings redeclaring built-ins which have not been
1178 explicitly declared. */
1179 if (DECL_ANTICIPATED (olddecl))
1182 /* If you declare a built-in or predefined function name as static,
1183 the old definition is overridden, but optionally warn this was a
1184 bad choice of name. */
1185 if (! TREE_PUBLIC (newdecl))
1187 warning (OPT_Wshadow, "shadowing %s function %q#D",
1188 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1190 /* Discard the old built-in function. */
1193 /* If the built-in is not ansi, then programs can override
1194 it even globally without an error. */
1195 else if (! DECL_BUILT_IN (olddecl))
1196 warning (0, "library function %q#D redeclared as non-function %q#D",
1200 error ("declaration of %q#D", newdecl);
1201 error ("conflicts with built-in declaration %q#D",
1206 else if (!types_match)
1208 /* Avoid warnings redeclaring built-ins which have not been
1209 explicitly declared. */
1210 if (DECL_ANTICIPATED (olddecl))
1212 /* Deal with fileptr_type_node. FILE type is not known
1213 at the time we create the builtins. */
1216 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1217 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1219 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1222 else if (TREE_VALUE (t2) == fileptr_type_node)
1224 tree t = TREE_VALUE (t1);
1226 if (TREE_CODE (t) == POINTER_TYPE
1227 && TYPE_NAME (TREE_TYPE (t))
1228 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1229 == get_identifier ("FILE")
1230 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1232 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1234 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1235 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1236 types_match = decls_match (newdecl, olddecl);
1238 return duplicate_decls (newdecl, olddecl,
1240 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1243 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1246 else if ((DECL_EXTERN_C_P (newdecl)
1247 && DECL_EXTERN_C_P (olddecl))
1248 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1249 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1251 /* A near match; override the builtin. */
1253 if (TREE_PUBLIC (newdecl))
1255 warning (0, "new declaration %q#D", newdecl);
1256 warning (0, "ambiguates built-in declaration %q#D",
1260 warning (OPT_Wshadow, "shadowing %s function %q#D",
1261 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1265 /* Discard the old built-in function. */
1268 /* Replace the old RTL to avoid problems with inlining. */
1269 COPY_DECL_RTL (newdecl, olddecl);
1271 /* Even if the types match, prefer the new declarations type for
1272 built-ins which have not been explicitly declared, for
1273 exception lists, etc... */
1274 else if (DECL_ANTICIPATED (olddecl))
1276 tree type = TREE_TYPE (newdecl);
1277 tree attribs = (*targetm.merge_type_attributes)
1278 (TREE_TYPE (olddecl), type);
1280 type = cp_build_type_attribute_variant (type, attribs);
1281 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1284 /* If a function is explicitly declared "throw ()", propagate that to
1285 the corresponding builtin. */
1286 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1287 && DECL_ANTICIPATED (olddecl)
1288 && TREE_NOTHROW (newdecl)
1289 && !TREE_NOTHROW (olddecl)
1290 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1291 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1293 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1295 /* Whether or not the builtin can throw exceptions has no
1296 bearing on this declarator. */
1297 TREE_NOTHROW (olddecl) = 0;
1299 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1301 /* If a builtin function is redeclared as `static', merge
1302 the declarations, but make the original one static. */
1303 DECL_THIS_STATIC (olddecl) = 1;
1304 TREE_PUBLIC (olddecl) = 0;
1306 /* Make the old declaration consistent with the new one so
1307 that all remnants of the builtin-ness of this function
1308 will be banished. */
1309 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1310 COPY_DECL_RTL (newdecl, olddecl);
1313 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1315 /* C++ Standard, 3.3, clause 4:
1316 "[Note: a namespace name or a class template name must be unique
1317 in its declarative region (7.3.2, clause 14). ]" */
1318 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1319 && TREE_CODE (newdecl) != NAMESPACE_DECL
1320 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1321 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1322 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1323 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1325 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1326 && TREE_CODE (newdecl) != TYPE_DECL)
1327 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1328 && TREE_CODE (olddecl) != TYPE_DECL))
1330 /* We do nothing special here, because C++ does such nasty
1331 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1332 get shadowed, and know that if we need to find a TYPE_DECL
1333 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1334 slot of the identifier. */
1338 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1339 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1340 || (TREE_CODE (olddecl) == FUNCTION_DECL
1341 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1345 error ("%q#D redeclared as different kind of symbol", newdecl);
1346 if (TREE_CODE (olddecl) == TREE_LIST)
1347 olddecl = TREE_VALUE (olddecl);
1348 error ("previous declaration of %q+#D", olddecl);
1350 return error_mark_node;
1352 else if (!types_match)
1354 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1355 /* These are certainly not duplicate declarations; they're
1356 from different scopes. */
1359 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1361 /* The name of a class template may not be declared to refer to
1362 any other template, class, function, object, namespace, value,
1363 or type in the same scope. */
1364 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1365 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1367 error ("declaration of template %q#D", newdecl);
1368 error ("conflicts with previous declaration %q+#D", olddecl);
1370 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1371 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1372 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1373 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1374 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1375 DECL_TEMPLATE_PARMS (olddecl))
1376 /* Template functions can be disambiguated by
1378 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1379 TREE_TYPE (TREE_TYPE (olddecl))))
1381 error ("new declaration %q#D", newdecl);
1382 error ("ambiguates old declaration %q+#D", olddecl);
1386 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1388 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1390 error ("declaration of C function %q#D conflicts with",
1392 error ("previous declaration %q+#D here", olddecl);
1394 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1395 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1397 error ("new declaration %q#D", newdecl);
1398 error ("ambiguates old declaration %q+#D", olddecl);
1399 return error_mark_node;
1406 error ("conflicting declaration %q#D", newdecl);
1407 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1408 return error_mark_node;
1411 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1412 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1413 && (!DECL_TEMPLATE_INFO (newdecl)
1414 || (DECL_TI_TEMPLATE (newdecl)
1415 != DECL_TI_TEMPLATE (olddecl))))
1416 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1417 && (!DECL_TEMPLATE_INFO (olddecl)
1418 || (DECL_TI_TEMPLATE (olddecl)
1419 != DECL_TI_TEMPLATE (newdecl))))))
1420 /* It's OK to have a template specialization and a non-template
1421 with the same type, or to have specializations of two
1422 different templates with the same type. Note that if one is a
1423 specialization, and the other is an instantiation of the same
1424 template, that we do not exit at this point. That situation
1425 can occur if we instantiate a template class, and then
1426 specialize one of its methods. This situation is valid, but
1427 the declarations must be merged in the usual way. */
1429 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1430 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1431 && !DECL_USE_TEMPLATE (newdecl))
1432 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1433 && !DECL_USE_TEMPLATE (olddecl))))
1434 /* One of the declarations is a template instantiation, and the
1435 other is not a template at all. That's OK. */
1437 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1439 /* In [namespace.alias] we have:
1441 In a declarative region, a namespace-alias-definition can be
1442 used to redefine a namespace-alias declared in that declarative
1443 region to refer only to the namespace to which it already
1446 Therefore, if we encounter a second alias directive for the same
1447 alias, we can just ignore the second directive. */
1448 if (DECL_NAMESPACE_ALIAS (newdecl)
1449 && (DECL_NAMESPACE_ALIAS (newdecl)
1450 == DECL_NAMESPACE_ALIAS (olddecl)))
1452 /* [namespace.alias]
1454 A namespace-name or namespace-alias shall not be declared as
1455 the name of any other entity in the same declarative region.
1456 A namespace-name defined at global scope shall not be
1457 declared as the name of any other entity in any global scope
1459 error ("declaration of namespace %qD conflicts with", newdecl);
1460 error ("previous declaration of namespace %q+D here", olddecl);
1461 return error_mark_node;
1465 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1468 error (errmsg, newdecl);
1469 if (DECL_NAME (olddecl) != NULL_TREE)
1470 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1471 ? "%q+#D previously defined here"
1472 : "%q+#D previously declared here", olddecl);
1473 return error_mark_node;
1475 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1476 && DECL_INITIAL (olddecl) != NULL_TREE
1477 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1478 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1480 /* Prototype decl follows defn w/o prototype. */
1481 warning (0, "prototype for %q+#D", newdecl);
1482 warning (0, "%Jfollows non-prototype definition here", olddecl);
1484 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1485 || TREE_CODE (olddecl) == VAR_DECL)
1486 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1489 If two declarations of the same function or object
1490 specify different linkage-specifications ..., the program
1491 is ill-formed.... Except for functions with C++ linkage,
1492 a function declaration without a linkage specification
1493 shall not precede the first linkage specification for
1494 that function. A function can be declared without a
1495 linkage specification after an explicit linkage
1496 specification has been seen; the linkage explicitly
1497 specified in the earlier declaration is not affected by
1498 such a function declaration.
1500 DR 563 raises the question why the restrictions on
1501 functions should not also apply to objects. Older
1502 versions of G++ silently ignore the linkage-specification
1510 which is clearly wrong. Therefore, we now treat objects
1512 if (current_lang_depth () == 0)
1514 /* There is no explicit linkage-specification, so we use
1515 the linkage from the previous declaration. */
1516 if (!DECL_LANG_SPECIFIC (newdecl))
1517 retrofit_lang_decl (newdecl);
1518 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1522 error ("previous declaration of %q+#D with %qL linkage",
1523 olddecl, DECL_LANGUAGE (olddecl));
1524 error ("conflicts with new declaration with %qL linkage",
1525 DECL_LANGUAGE (newdecl));
1529 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1531 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1533 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1534 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1537 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1538 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1540 for (; t1 && t1 != void_list_node;
1541 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1542 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1544 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1547 permerror (input_location, "default argument given for parameter %d of %q#D",
1549 permerror (input_location, "after previous specification in %q+#D", olddecl);
1553 error ("default argument given for parameter %d of %q#D",
1555 error ("after previous specification in %q+#D",
1562 /* Do not merge an implicit typedef with an explicit one. In:
1566 typedef class A A __attribute__ ((foo));
1568 the attribute should apply only to the typedef. */
1569 if (TREE_CODE (olddecl) == TYPE_DECL
1570 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1571 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1574 /* If new decl is `static' and an `extern' was seen previously,
1576 warn_extern_redeclared_static (newdecl, olddecl);
1578 /* We have committed to returning 1 at this point. */
1579 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1581 /* Now that functions must hold information normally held
1582 by field decls, there is extra work to do so that
1583 declaration information does not get destroyed during
1585 if (DECL_VINDEX (olddecl))
1586 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1587 if (DECL_CONTEXT (olddecl))
1588 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1589 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1590 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1591 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1592 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1593 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1594 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1595 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1596 SET_OVERLOADED_OPERATOR_CODE
1597 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1598 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1600 /* Optionally warn about more than one declaration for the same
1601 name, but don't warn about a function declaration followed by a
1603 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1604 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1605 /* Don't warn about extern decl followed by definition. */
1606 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1607 /* Don't warn about friends, let add_friend take care of it. */
1608 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1610 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1611 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1614 if (DECL_DELETED_FN (newdecl))
1616 error ("deleted definition of %qD", newdecl);
1617 error ("after previous declaration %q+D", olddecl);
1621 /* Deal with C++: must preserve virtual function table size. */
1622 if (TREE_CODE (olddecl) == TYPE_DECL)
1624 tree newtype = TREE_TYPE (newdecl);
1625 tree oldtype = TREE_TYPE (olddecl);
1627 if (newtype != error_mark_node && oldtype != error_mark_node
1628 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1629 CLASSTYPE_FRIEND_CLASSES (newtype)
1630 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1632 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1635 /* Copy all the DECL_... slots specified in the new decl
1636 except for any that we copy here from the old type. */
1637 DECL_ATTRIBUTES (newdecl)
1638 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1640 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1644 old_result = DECL_TEMPLATE_RESULT (olddecl);
1645 new_result = DECL_TEMPLATE_RESULT (newdecl);
1646 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1647 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1648 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1649 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1651 DECL_ATTRIBUTES (old_result)
1652 = (*targetm.merge_decl_attributes) (old_result, new_result);
1654 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1656 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1657 && DECL_INITIAL (new_result))
1659 if (DECL_INITIAL (old_result))
1660 DECL_UNINLINABLE (old_result) = 1;
1662 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1663 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1664 DECL_NOT_REALLY_EXTERN (old_result)
1665 = DECL_NOT_REALLY_EXTERN (new_result);
1666 DECL_INTERFACE_KNOWN (old_result)
1667 = DECL_INTERFACE_KNOWN (new_result);
1668 DECL_DECLARED_INLINE_P (old_result)
1669 = DECL_DECLARED_INLINE_P (new_result);
1670 DECL_DISREGARD_INLINE_LIMITS (old_result)
1671 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1676 DECL_DECLARED_INLINE_P (old_result)
1677 |= DECL_DECLARED_INLINE_P (new_result);
1678 DECL_DISREGARD_INLINE_LIMITS (old_result)
1679 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1680 check_redeclaration_exception_specification (newdecl, olddecl);
1684 /* If the new declaration is a definition, update the file and
1685 line information on the declaration, and also make
1686 the old declaration the same definition. */
1687 if (DECL_INITIAL (new_result) != NULL_TREE)
1689 DECL_SOURCE_LOCATION (olddecl)
1690 = DECL_SOURCE_LOCATION (old_result)
1691 = DECL_SOURCE_LOCATION (newdecl);
1692 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1693 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1694 DECL_ARGUMENTS (old_result)
1695 = DECL_ARGUMENTS (new_result);
1703 /* Automatically handles default parameters. */
1704 tree oldtype = TREE_TYPE (olddecl);
1707 /* Merge the data types specified in the two decls. */
1708 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1710 /* If merge_types produces a non-typedef type, just use the old type. */
1711 if (TREE_CODE (newdecl) == TYPE_DECL
1712 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1715 if (TREE_CODE (newdecl) == VAR_DECL)
1717 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1718 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1719 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1720 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1721 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1722 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1724 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1725 if (DECL_LANG_SPECIFIC (olddecl)
1726 && CP_DECL_THREADPRIVATE_P (olddecl))
1728 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1729 if (!DECL_LANG_SPECIFIC (newdecl))
1730 retrofit_lang_decl (newdecl);
1732 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1733 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1737 /* Do this after calling `merge_types' so that default
1738 parameters don't confuse us. */
1739 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1740 check_redeclaration_exception_specification (newdecl, olddecl);
1741 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1743 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1744 check_default_args (newdecl);
1746 /* Lay the type out, unless already done. */
1747 if (! same_type_p (newtype, oldtype)
1748 && TREE_TYPE (newdecl) != error_mark_node
1749 && !(processing_template_decl && uses_template_parms (newdecl)))
1750 layout_type (TREE_TYPE (newdecl));
1752 if ((TREE_CODE (newdecl) == VAR_DECL
1753 || TREE_CODE (newdecl) == PARM_DECL
1754 || TREE_CODE (newdecl) == RESULT_DECL
1755 || TREE_CODE (newdecl) == FIELD_DECL
1756 || TREE_CODE (newdecl) == TYPE_DECL)
1757 && !(processing_template_decl && uses_template_parms (newdecl)))
1758 layout_decl (newdecl, 0);
1760 /* Merge the type qualifiers. */
1761 if (TREE_READONLY (newdecl))
1762 TREE_READONLY (olddecl) = 1;
1763 if (TREE_THIS_VOLATILE (newdecl))
1764 TREE_THIS_VOLATILE (olddecl) = 1;
1765 if (TREE_NOTHROW (newdecl))
1766 TREE_NOTHROW (olddecl) = 1;
1768 /* Merge deprecatedness. */
1769 if (TREE_DEPRECATED (newdecl))
1770 TREE_DEPRECATED (olddecl) = 1;
1772 /* Preserve function specific target and optimization options */
1773 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1775 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1776 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1777 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1778 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1780 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1781 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1782 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1783 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1786 /* Merge the initialization information. */
1787 if (DECL_INITIAL (newdecl) == NULL_TREE
1788 && DECL_INITIAL (olddecl) != NULL_TREE)
1790 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1791 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1792 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1793 && DECL_LANG_SPECIFIC (newdecl)
1794 && DECL_LANG_SPECIFIC (olddecl))
1796 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1797 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1801 /* Merge the section attribute.
1802 We want to issue an error if the sections conflict but that must be
1803 done later in decl_attributes since we are called before attributes
1805 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1806 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1808 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1810 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1811 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1812 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1813 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1814 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1815 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1816 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1817 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1818 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1819 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1820 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1821 /* Keep the old RTL. */
1822 COPY_DECL_RTL (olddecl, newdecl);
1824 else if (TREE_CODE (newdecl) == VAR_DECL
1825 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1827 /* Keep the old RTL. We cannot keep the old RTL if the old
1828 declaration was for an incomplete object and the new
1829 declaration is not since many attributes of the RTL will
1831 COPY_DECL_RTL (olddecl, newdecl);
1834 /* If cannot merge, then use the new type and qualifiers,
1835 and don't preserve the old rtl. */
1838 /* Clean out any memory we had of the old declaration. */
1839 tree oldstatic = value_member (olddecl, static_aggregates);
1841 TREE_VALUE (oldstatic) = error_mark_node;
1843 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1844 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1845 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1846 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1849 /* Merge the storage class information. */
1850 merge_weak (newdecl, olddecl);
1852 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1853 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1854 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1855 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1856 if (! DECL_EXTERNAL (olddecl))
1857 DECL_EXTERNAL (newdecl) = 0;
1859 new_template = NULL_TREE;
1860 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1862 bool new_redefines_gnu_inline = false;
1864 if (new_defines_function
1865 && ((DECL_INTERFACE_KNOWN (olddecl)
1866 && TREE_CODE (olddecl) == FUNCTION_DECL)
1867 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1868 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1869 == FUNCTION_DECL))))
1873 if (TREE_CODE (fn) == TEMPLATE_DECL)
1874 fn = DECL_TEMPLATE_RESULT (olddecl);
1876 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1879 if (!new_redefines_gnu_inline)
1881 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1882 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1883 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1885 DECL_TEMPLATE_INSTANTIATED (newdecl)
1886 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1888 /* If the OLDDECL is an instantiation and/or specialization,
1889 then the NEWDECL must be too. But, it may not yet be marked
1890 as such if the caller has created NEWDECL, but has not yet
1891 figured out that it is a redeclaration. */
1892 if (!DECL_USE_TEMPLATE (newdecl))
1893 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1895 /* Don't really know how much of the language-specific
1896 values we should copy from old to new. */
1897 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1898 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1899 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1900 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1901 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1902 if (DECL_TEMPLATE_INFO (newdecl))
1903 new_template = DECL_TI_TEMPLATE (newdecl);
1904 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1905 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1906 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1907 olddecl_friend = DECL_FRIEND_P (olddecl);
1908 hidden_friend = (DECL_ANTICIPATED (olddecl)
1909 && DECL_HIDDEN_FRIEND_P (olddecl)
1910 && newdecl_is_friend);
1912 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1913 if (TREE_CODE (newdecl) == FUNCTION_DECL
1914 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1916 DECL_BEFRIENDING_CLASSES (newdecl)
1917 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1918 DECL_BEFRIENDING_CLASSES (olddecl));
1919 /* DECL_THUNKS is only valid for virtual functions,
1920 otherwise it is a DECL_FRIEND_CONTEXT. */
1921 if (DECL_VIRTUAL_P (newdecl))
1922 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1926 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1928 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1929 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1931 /* If newdecl is not a specialization, then it is not a
1932 template-related function at all. And that means that we
1933 should have exited above, returning 0. */
1934 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1936 if (TREE_USED (olddecl))
1937 /* From [temp.expl.spec]:
1939 If a template, a member template or the member of a class
1940 template is explicitly specialized then that
1941 specialization shall be declared before the first use of
1942 that specialization that would cause an implicit
1943 instantiation to take place, in every translation unit in
1944 which such a use occurs. */
1945 error ("explicit specialization of %qD after first use",
1948 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1950 /* Don't propagate visibility from the template to the
1951 specialization here. We'll do that in determine_visibility if
1953 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1955 /* [temp.expl.spec/14] We don't inline explicit specialization
1956 just because the primary template says so. */
1958 else if (new_defines_function && DECL_INITIAL (olddecl))
1960 /* Never inline re-defined extern inline functions.
1961 FIXME: this could be better handled by keeping both
1962 function as separate declarations. */
1963 DECL_UNINLINABLE (newdecl) = 1;
1967 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1968 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1970 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1972 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1973 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1975 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1976 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1977 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1978 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1981 /* Preserve abstractness on cloned [cd]tors. */
1982 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1986 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1987 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1988 COPY_DECL_RTL (newdecl, olddecl);
1990 if (! types_match || new_defines_function)
1992 /* These need to be copied so that the names are available.
1993 Note that if the types do match, we'll preserve inline
1994 info and other bits, but if not, we won't. */
1995 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1996 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1998 if (new_defines_function)
1999 /* If defining a function declared with other language
2000 linkage, use the previously declared language linkage. */
2001 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2002 else if (types_match)
2004 /* If redeclaring a builtin function, and not a definition,
2005 it stays built in. */
2006 if (DECL_BUILT_IN (olddecl))
2008 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2009 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2010 /* If we're keeping the built-in definition, keep the rtl,
2011 regardless of declaration matches. */
2012 COPY_DECL_RTL (olddecl, newdecl);
2015 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2016 /* Don't clear out the arguments if we're redefining a function. */
2017 if (DECL_ARGUMENTS (olddecl))
2018 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2021 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2022 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2024 /* Now preserve various other info from the definition. */
2025 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2026 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2027 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2028 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2030 /* Warn about conflicting visibility specifications. */
2031 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2032 && DECL_VISIBILITY_SPECIFIED (newdecl)
2033 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2035 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2036 "because it", newdecl);
2037 warning (OPT_Wattributes, "%Jconflicts with previous "
2038 "declaration here", olddecl);
2040 /* Choose the declaration which specified visibility. */
2041 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2043 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2044 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2046 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2047 so keep this behavior. */
2048 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2050 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2051 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2054 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2055 with that from NEWDECL below. */
2056 if (DECL_LANG_SPECIFIC (olddecl))
2058 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2059 != DECL_LANG_SPECIFIC (newdecl));
2060 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2063 /* Merge the USED information. */
2064 if (TREE_USED (olddecl))
2065 TREE_USED (newdecl) = 1;
2066 else if (TREE_USED (newdecl))
2067 TREE_USED (olddecl) = 1;
2069 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2073 function_size = sizeof (struct tree_decl_common);
2075 memcpy ((char *) olddecl + sizeof (struct tree_common),
2076 (char *) newdecl + sizeof (struct tree_common),
2077 function_size - sizeof (struct tree_common));
2079 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2080 (char *) newdecl + sizeof (struct tree_decl_common),
2081 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2083 /* If newdecl is a template instantiation, it is possible that
2084 the following sequence of events has occurred:
2086 o A friend function was declared in a class template. The
2087 class template was instantiated.
2089 o The instantiation of the friend declaration was
2090 recorded on the instantiation list, and is newdecl.
2092 o Later, however, instantiate_class_template called pushdecl
2093 on the newdecl to perform name injection. But, pushdecl in
2094 turn called duplicate_decls when it discovered that another
2095 declaration of a global function with the same name already
2098 o Here, in duplicate_decls, we decided to clobber newdecl.
2100 If we're going to do that, we'd better make sure that
2101 olddecl, and not newdecl, is on the list of
2102 instantiations so that if we try to do the instantiation
2103 again we won't get the clobbered declaration. */
2104 reregister_specialization (newdecl,
2110 size_t size = tree_code_size (TREE_CODE (olddecl));
2111 memcpy ((char *) olddecl + sizeof (struct tree_common),
2112 (char *) newdecl + sizeof (struct tree_common),
2113 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2114 switch (TREE_CODE (olddecl))
2124 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2125 (char *) newdecl + sizeof (struct tree_decl_common),
2126 size - sizeof (struct tree_decl_common)
2127 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2131 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2132 (char *) newdecl + sizeof (struct tree_decl_common),
2133 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2134 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2138 DECL_UID (olddecl) = olddecl_uid;
2140 DECL_FRIEND_P (olddecl) = 1;
2143 DECL_ANTICIPATED (olddecl) = 1;
2144 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2147 /* NEWDECL contains the merged attribute lists.
2148 Update OLDDECL to be the same. */
2149 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2151 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2152 so that encode_section_info has a chance to look at the new decl
2153 flags and attributes. */
2154 if (DECL_RTL_SET_P (olddecl)
2155 && (TREE_CODE (olddecl) == FUNCTION_DECL
2156 || (TREE_CODE (olddecl) == VAR_DECL
2157 && TREE_STATIC (olddecl))))
2158 make_decl_rtl (olddecl);
2160 /* The NEWDECL will no longer be needed. Because every out-of-class
2161 declaration of a member results in a call to duplicate_decls,
2162 freeing these nodes represents in a significant savings. */
2168 /* Return zero if the declaration NEWDECL is valid
2169 when the declaration OLDDECL (assumed to be for the same name)
2170 has already been seen.
2171 Otherwise return an error message format string with a %s
2172 where the identifier should go. */
2175 redeclaration_error_message (tree newdecl, tree olddecl)
2177 if (TREE_CODE (newdecl) == TYPE_DECL)
2179 /* Because C++ can put things into name space for free,
2180 constructs like "typedef struct foo { ... } foo"
2181 would look like an erroneous redeclaration. */
2182 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2185 return "redefinition of %q#D";
2187 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2189 /* If this is a pure function, its olddecl will actually be
2190 the original initialization to `0' (which we force to call
2191 abort()). Don't complain about redefinition in this case. */
2192 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2193 && DECL_INITIAL (olddecl) == NULL_TREE)
2196 /* If both functions come from different namespaces, this is not
2197 a redeclaration - this is a conflict with a used function. */
2198 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2199 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2200 && ! decls_match (olddecl, newdecl))
2201 return "%qD conflicts with used function";
2203 /* We'll complain about linkage mismatches in
2204 warn_extern_redeclared_static. */
2206 /* Defining the same name twice is no good. */
2207 if (DECL_INITIAL (olddecl) != NULL_TREE
2208 && DECL_INITIAL (newdecl) != NULL_TREE)
2210 if (DECL_NAME (olddecl) == NULL_TREE)
2211 return "%q#D not declared in class";
2212 else if (!GNU_INLINE_P (olddecl)
2213 || GNU_INLINE_P (newdecl))
2214 return "redefinition of %q#D";
2217 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2219 bool olda = GNU_INLINE_P (olddecl);
2220 bool newa = GNU_INLINE_P (newdecl);
2225 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2227 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2233 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2237 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2239 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2240 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2241 return "redefinition of %q#D";
2245 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2246 || (DECL_TEMPLATE_RESULT (newdecl)
2247 == DECL_TEMPLATE_RESULT (olddecl)))
2250 nt = DECL_TEMPLATE_RESULT (newdecl);
2251 if (DECL_TEMPLATE_INFO (nt))
2252 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2253 ot = DECL_TEMPLATE_RESULT (olddecl);
2254 if (DECL_TEMPLATE_INFO (ot))
2255 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2256 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2257 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2258 return "redefinition of %q#D";
2260 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2262 bool olda = GNU_INLINE_P (ot);
2263 bool newa = GNU_INLINE_P (nt);
2268 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2270 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2274 /* Core issue #226 (C++0x):
2276 If a friend function template declaration specifies a
2277 default template-argument, that declaration shall be a
2278 definition and shall be the only declaration of the
2279 function template in the translation unit. */
2280 if ((cxx_dialect != cxx98)
2281 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2282 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2283 /*is_primary=*/1, /*is_partial=*/0,
2284 /*is_friend_decl=*/2))
2285 return "redeclaration of friend %q#D may not have default template arguments";
2289 else if (TREE_CODE (newdecl) == VAR_DECL
2290 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2291 && (! DECL_LANG_SPECIFIC (olddecl)
2292 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2293 || DECL_THREAD_LOCAL_P (newdecl)))
2295 /* Only variables can be thread-local, and all declarations must
2296 agree on this property. */
2297 if (DECL_THREAD_LOCAL_P (newdecl))
2298 return "thread-local declaration of %q#D follows "
2299 "non-thread-local declaration";
2301 return "non-thread-local declaration of %q#D follows "
2302 "thread-local declaration";
2304 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2306 /* The objects have been declared at namespace scope. If either
2307 is a member of an anonymous union, then this is an invalid
2308 redeclaration. For example:
2314 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2315 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2316 return "redeclaration of %q#D";
2317 /* If at least one declaration is a reference, there is no
2318 conflict. For example:
2324 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2326 /* Reject two definitions. */
2327 return "redefinition of %q#D";
2331 /* Objects declared with block scope: */
2332 /* Reject two definitions, and reject a definition
2333 together with an external reference. */
2334 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2335 return "redeclaration of %q#D";
2340 /* Hash and equality functions for the named_label table. */
2343 named_label_entry_hash (const void *data)
2345 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2346 return DECL_UID (ent->label_decl);
2350 named_label_entry_eq (const void *a, const void *b)
2352 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2353 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2354 return ent_a->label_decl == ent_b->label_decl;
2357 /* Create a new label, named ID. */
2360 make_label_decl (tree id, int local_p)
2362 struct named_label_entry *ent;
2366 decl = build_decl (LABEL_DECL, id, void_type_node);
2368 DECL_CONTEXT (decl) = current_function_decl;
2369 DECL_MODE (decl) = VOIDmode;
2370 C_DECLARED_LABEL_FLAG (decl) = local_p;
2372 /* Say where one reference is to the label, for the sake of the
2373 error if it is not defined. */
2374 DECL_SOURCE_LOCATION (decl) = input_location;
2376 /* Record the fact that this identifier is bound to this label. */
2377 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2379 /* Create the label htab for the function on demand. */
2381 named_labels = htab_create_ggc (13, named_label_entry_hash,
2382 named_label_entry_eq, NULL);
2384 /* Record this label on the list of labels used in this function.
2385 We do this before calling make_label_decl so that we get the
2386 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2387 ent = GGC_CNEW (struct named_label_entry);
2388 ent->label_decl = decl;
2390 slot = htab_find_slot (named_labels, ent, INSERT);
2391 gcc_assert (*slot == NULL);
2397 /* Look for a label named ID in the current function. If one cannot
2398 be found, create one. (We keep track of used, but undefined,
2399 labels, and complain about them at the end of a function.) */
2402 lookup_label (tree id)
2406 timevar_push (TV_NAME_LOOKUP);
2407 /* You can't use labels at global scope. */
2408 if (current_function_decl == NULL_TREE)
2410 error ("label %qE referenced outside of any function", id);
2411 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2414 /* See if we've already got this label. */
2415 decl = IDENTIFIER_LABEL_VALUE (id);
2416 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2417 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2419 decl = make_label_decl (id, /*local_p=*/0);
2420 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2423 /* Declare a local label named ID. */
2426 declare_local_label (tree id)
2430 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2431 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2432 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2433 current_binding_level->shadowed_labels);
2434 current_binding_level->shadowed_labels = shadow;
2436 decl = make_label_decl (id, /*local_p=*/1);
2437 TREE_VALUE (shadow) = decl;
2442 /* Returns nonzero if it is ill-formed to jump past the declaration of
2443 DECL. Returns 2 if it's also a real problem. */
2446 decl_jump_unsafe (tree decl)
2448 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2449 || TREE_TYPE (decl) == error_mark_node)
2452 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2453 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2456 if (pod_type_p (TREE_TYPE (decl)))
2459 /* The POD stuff is just pedantry; why should it matter if the class
2460 contains a field of pointer to member type? */
2464 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2467 identify_goto (tree decl, const location_t *locus)
2470 permerror (input_location, "jump to label %qD", decl);
2472 permerror (input_location, "jump to case label");
2474 permerror (input_location, "%H from here", locus);
2477 /* Check that a single previously seen jump to a newly defined label
2478 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2479 the jump context; NAMES are the names in scope in LEVEL at the jump
2480 context; LOCUS is the source position of the jump or 0. Returns
2481 true if all is well. */
2484 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2485 bool exited_omp, const location_t *locus)
2487 struct cp_binding_level *b;
2488 bool identified = false, saw_eh = false, saw_omp = false;
2492 identify_goto (decl, locus);
2493 error (" exits OpenMP structured block");
2494 identified = saw_omp = true;
2497 for (b = current_binding_level; b ; b = b->level_chain)
2499 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2501 for (new_decls = b->names; new_decls != old_decls;
2502 new_decls = TREE_CHAIN (new_decls))
2504 int problem = decl_jump_unsafe (new_decls);
2510 identify_goto (decl, locus);
2514 error (" crosses initialization of %q+#D", new_decls);
2516 permerror (input_location, " enters scope of non-POD %q+#D", new_decls);
2521 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2525 identify_goto (decl, locus);
2528 if (b->kind == sk_try)
2529 error (" enters try block");
2531 error (" enters catch block");
2534 if (b->kind == sk_omp && !saw_omp)
2538 identify_goto (decl, locus);
2541 error (" enters OpenMP structured block");
2550 check_previous_goto (tree decl, struct named_label_use_entry *use)
2552 check_previous_goto_1 (decl, use->binding_level,
2553 use->names_in_scope, use->in_omp_scope,
2554 &use->o_goto_locus);
2558 check_switch_goto (struct cp_binding_level* level)
2560 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2563 /* Check that a new jump to a label DECL is OK. Called by
2564 finish_goto_stmt. */
2567 check_goto (tree decl)
2569 struct named_label_entry *ent, dummy;
2570 bool saw_catch = false, identified = false;
2573 /* We can't know where a computed goto is jumping.
2574 So we assume that it's OK. */
2575 if (TREE_CODE (decl) != LABEL_DECL)
2578 /* We didn't record any information about this label when we created it,
2579 and there's not much point since it's trivial to analyze as a return. */
2580 if (decl == cdtor_label)
2583 dummy.label_decl = decl;
2584 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2585 gcc_assert (ent != NULL);
2587 /* If the label hasn't been defined yet, defer checking. */
2588 if (! DECL_INITIAL (decl))
2590 struct named_label_use_entry *new_use;
2592 /* Don't bother creating another use if the last goto had the
2593 same data, and will therefore create the same set of errors. */
2595 && ent->uses->names_in_scope == current_binding_level->names)
2598 new_use = GGC_NEW (struct named_label_use_entry);
2599 new_use->binding_level = current_binding_level;
2600 new_use->names_in_scope = current_binding_level->names;
2601 new_use->o_goto_locus = input_location;
2602 new_use->in_omp_scope = false;
2604 new_use->next = ent->uses;
2605 ent->uses = new_use;
2609 if (ent->in_try_scope || ent->in_catch_scope
2610 || ent->in_omp_scope || ent->bad_decls)
2612 permerror (input_location, "jump to label %q+D", decl);
2613 permerror (input_location, " from here");
2617 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2619 tree b = TREE_VALUE (bad);
2620 int u = decl_jump_unsafe (b);
2622 if (u > 1 && DECL_ARTIFICIAL (b))
2624 /* Can't skip init of __exception_info. */
2625 error ("%J enters catch block", b);
2629 error (" skips initialization of %q+#D", b);
2631 permerror (input_location, " enters scope of non-POD %q+#D", b);
2634 if (ent->in_try_scope)
2635 error (" enters try block");
2636 else if (ent->in_catch_scope && !saw_catch)
2637 error (" enters catch block");
2639 if (ent->in_omp_scope)
2640 error (" enters OpenMP structured block");
2641 else if (flag_openmp)
2643 struct cp_binding_level *b;
2644 for (b = current_binding_level; b ; b = b->level_chain)
2646 if (b == ent->binding_level)
2648 if (b->kind == sk_omp)
2652 permerror (input_location, "jump to label %q+D", decl);
2653 permerror (input_location, " from here");
2656 error (" exits OpenMP structured block");
2663 /* Check that a return is ok wrt OpenMP structured blocks.
2664 Called by finish_return_stmt. Returns true if all is well. */
2667 check_omp_return (void)
2669 struct cp_binding_level *b;
2670 for (b = current_binding_level; b ; b = b->level_chain)
2671 if (b->kind == sk_omp)
2673 error ("invalid exit from OpenMP structured block");
2679 /* Define a label, specifying the location in the source file.
2680 Return the LABEL_DECL node for the label. */
2683 define_label (location_t location, tree name)
2685 struct named_label_entry *ent, dummy;
2686 struct cp_binding_level *p;
2689 timevar_push (TV_NAME_LOOKUP);
2691 decl = lookup_label (name);
2693 dummy.label_decl = decl;
2694 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2695 gcc_assert (ent != NULL);
2697 /* After labels, make any new cleanups in the function go into their
2698 own new (temporary) binding contour. */
2699 for (p = current_binding_level;
2700 p->kind != sk_function_parms;
2702 p->more_cleanups_ok = 0;
2704 if (name == get_identifier ("wchar_t"))
2705 permerror (input_location, "label named wchar_t");
2707 if (DECL_INITIAL (decl) != NULL_TREE)
2709 error ("duplicate label %qD", decl);
2710 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2714 struct named_label_use_entry *use;
2716 /* Mark label as having been defined. */
2717 DECL_INITIAL (decl) = error_mark_node;
2718 /* Say where in the source. */
2719 DECL_SOURCE_LOCATION (decl) = location;
2721 ent->binding_level = current_binding_level;
2722 ent->names_in_scope = current_binding_level->names;
2724 for (use = ent->uses; use ; use = use->next)
2725 check_previous_goto (decl, use);
2729 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2734 struct cp_binding_level *level;
2735 struct cp_switch *next;
2736 /* The SWITCH_STMT being built. */
2738 /* A splay-tree mapping the low element of a case range to the high
2739 element, or NULL_TREE if there is no high element. Used to
2740 determine whether or not a new case label duplicates an old case
2741 label. We need a tree, rather than simply a hash table, because
2742 of the GNU case range extension. */
2746 /* A stack of the currently active switch statements. The innermost
2747 switch statement is on the top of the stack. There is no need to
2748 mark the stack for garbage collection because it is only active
2749 during the processing of the body of a function, and we never
2750 collect at that point. */
2752 static struct cp_switch *switch_stack;
2754 /* Called right after a switch-statement condition is parsed.
2755 SWITCH_STMT is the switch statement being parsed. */
2758 push_switch (tree switch_stmt)
2760 struct cp_switch *p = XNEW (struct cp_switch);
2761 p->level = current_binding_level;
2762 p->next = switch_stack;
2763 p->switch_stmt = switch_stmt;
2764 p->cases = splay_tree_new (case_compare, NULL, NULL);
2771 struct cp_switch *cs = switch_stack;
2772 location_t switch_location;
2774 /* Emit warnings as needed. */
2775 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2776 switch_location = EXPR_LOCATION (cs->switch_stmt);
2778 switch_location = input_location;
2779 if (!processing_template_decl)
2780 c_do_switch_warnings (cs->cases, switch_location,
2781 SWITCH_STMT_TYPE (cs->switch_stmt),
2782 SWITCH_STMT_COND (cs->switch_stmt));
2784 splay_tree_delete (cs->cases);
2785 switch_stack = switch_stack->next;
2789 /* Note that we've seen a definition of a case label, and complain if this
2790 is a bad place for one. */
2793 finish_case_label (tree low_value, tree high_value)
2796 struct cp_binding_level *p;
2798 if (processing_template_decl)
2802 /* For templates, just add the case label; we'll do semantic
2803 analysis at instantiation-time. */
2804 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2805 return add_stmt (build_case_label (low_value, high_value, label));
2808 /* Find the condition on which this switch statement depends. */
2809 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2810 if (cond && TREE_CODE (cond) == TREE_LIST)
2811 cond = TREE_VALUE (cond);
2813 if (!check_switch_goto (switch_stack->level))
2814 return error_mark_node;
2816 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2817 low_value, high_value);
2819 /* After labels, make any new cleanups in the function go into their
2820 own new (temporary) binding contour. */
2821 for (p = current_binding_level;
2822 p->kind != sk_function_parms;
2824 p->more_cleanups_ok = 0;
2829 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2832 typename_hash (const void* k)
2835 const_tree const t = (const_tree) k;
2837 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2838 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2843 typedef struct typename_info {
2851 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2852 really of type `typename_info*' */
2855 typename_compare (const void * k1, const void * k2)
2857 const_tree const t1 = (const_tree) k1;
2858 const typename_info *const t2 = (const typename_info *) k2;
2860 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2861 && TYPE_CONTEXT (t1) == t2->scope
2862 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2863 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2864 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2867 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2868 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2870 Returns the new TYPENAME_TYPE. */
2872 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2875 build_typename_type (tree context, tree name, tree fullname,
2876 enum tag_types tag_type)
2884 if (typename_htab == NULL)
2885 typename_htab = htab_create_ggc (61, &typename_hash,
2886 &typename_compare, NULL);
2888 ti.scope = FROB_CONTEXT (context);
2890 ti.template_id = fullname;
2891 ti.enum_p = tag_type == enum_type;
2892 ti.class_p = (tag_type == class_type
2893 || tag_type == record_type
2894 || tag_type == union_type);
2895 hash = (htab_hash_pointer (ti.scope)
2896 ^ htab_hash_pointer (ti.name));
2898 /* See if we already have this type. */
2899 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2904 /* Build the TYPENAME_TYPE. */
2905 t = cxx_make_type (TYPENAME_TYPE);
2906 TYPE_CONTEXT (t) = ti.scope;
2907 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2908 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2909 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2911 /* Build the corresponding TYPE_DECL. */
2912 d = build_decl (TYPE_DECL, name, t);
2913 TYPE_NAME (TREE_TYPE (d)) = d;
2914 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2915 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2916 DECL_ARTIFICIAL (d) = 1;
2918 /* Store it in the hash table. */
2921 /* TYPENAME_TYPEs must always be compared structurally, because
2922 they may or may not resolve down to another type depending on
2923 the currently open classes. */
2924 SET_TYPE_STRUCTURAL_EQUALITY (t);
2930 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2931 provided to name the type. Returns an appropriate type, unless an
2932 error occurs, in which case error_mark_node is returned. If we
2933 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2934 return that, rather than the _TYPE it corresponds to, in other
2935 cases we look through the type decl. If TF_ERROR is set, complain
2936 about errors, otherwise be quiet. */
2939 make_typename_type (tree context, tree name, enum tag_types tag_type,
2940 tsubst_flags_t complain)
2946 if (name == error_mark_node
2947 || context == NULL_TREE
2948 || context == error_mark_node)
2949 return error_mark_node;
2953 if (!(TYPE_LANG_SPECIFIC (name)
2954 && (CLASSTYPE_IS_TEMPLATE (name)
2955 || CLASSTYPE_USE_TEMPLATE (name))))
2956 name = TYPE_IDENTIFIER (name);
2958 /* Create a TEMPLATE_ID_EXPR for the type. */
2959 name = build_nt (TEMPLATE_ID_EXPR,
2960 CLASSTYPE_TI_TEMPLATE (name),
2961 CLASSTYPE_TI_ARGS (name));
2963 else if (TREE_CODE (name) == TYPE_DECL)
2964 name = DECL_NAME (name);
2968 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2970 name = TREE_OPERAND (name, 0);
2971 if (TREE_CODE (name) == TEMPLATE_DECL)
2972 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2973 else if (TREE_CODE (name) == OVERLOAD)
2975 error ("%qD is not a type", name);
2976 return error_mark_node;
2979 if (TREE_CODE (name) == TEMPLATE_DECL)
2981 error ("%qD used without template parameters", name);
2982 return error_mark_node;
2984 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2985 gcc_assert (TYPE_P (context));
2987 /* When the CONTEXT is a dependent type, NAME could refer to a
2988 dependent base class of CONTEXT. So we cannot peek inside it,
2989 even if CONTEXT is a currently open scope. */
2990 if (dependent_type_p (context))
2991 return build_typename_type (context, name, fullname, tag_type);
2993 if (!MAYBE_CLASS_TYPE_P (context))
2995 if (complain & tf_error)
2996 error ("%q#T is not a class", context);
2997 return error_mark_node;
3000 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3002 /* We should only set WANT_TYPE when we're a nested typename type.
3003 Then we can give better diagnostics if we find a non-type. */
3004 t = lookup_field (context, name, 0, /*want_type=*/true);
3007 if (complain & tf_error)
3008 error (want_template ? "no class template named %q#T in %q#T"
3009 : "no type named %q#T in %q#T", name, context);
3010 return error_mark_node;
3013 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3015 if (complain & tf_error)
3016 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3018 return error_mark_node;
3020 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3022 if (complain & tf_error)
3023 error ("%<typename %T::%D%> names %q#T, which is not a type",
3025 return error_mark_node;
3028 if (complain & tf_error)
3029 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3032 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3034 /*entering_scope=*/0,
3035 tf_warning_or_error | tf_user);
3037 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3043 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3044 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3045 in which case error_mark_node is returned.
3047 If PARM_LIST is non-NULL, also make sure that the template parameter
3048 list of TEMPLATE_DECL matches.
3050 If COMPLAIN zero, don't complain about any errors that occur. */
3053 make_unbound_class_template (tree context, tree name, tree parm_list,
3054 tsubst_flags_t complain)
3060 name = TYPE_IDENTIFIER (name);
3061 else if (DECL_P (name))
3062 name = DECL_NAME (name);
3063 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3065 if (!dependent_type_p (context)
3066 || currently_open_class (context))
3068 tree tmpl = NULL_TREE;
3070 if (MAYBE_CLASS_TYPE_P (context))
3071 tmpl = lookup_field (context, name, 0, false);
3073 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3075 if (complain & tf_error)
3076 error ("no class template named %q#T in %q#T", name, context);
3077 return error_mark_node;
3081 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3083 if (complain & tf_error)
3085 error ("template parameters do not match template");
3086 error ("%q+D declared here", tmpl);
3088 return error_mark_node;
3091 if (complain & tf_error)
3092 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3097 /* Build the UNBOUND_CLASS_TEMPLATE. */
3098 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3099 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3100 TREE_TYPE (t) = NULL_TREE;
3101 SET_TYPE_STRUCTURAL_EQUALITY (t);
3103 /* Build the corresponding TEMPLATE_DECL. */
3104 d = build_decl (TEMPLATE_DECL, name, t);
3105 TYPE_NAME (TREE_TYPE (d)) = d;
3106 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3107 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3108 DECL_ARTIFICIAL (d) = 1;
3109 DECL_TEMPLATE_PARMS (d) = parm_list;
3116 /* Push the declarations of builtin types into the namespace.
3117 RID_INDEX is the index of the builtin type in the array
3118 RID_POINTERS. NAME is the name used when looking up the builtin
3119 type. TYPE is the _TYPE node for the builtin type. */
3122 record_builtin_type (enum rid rid_index,
3126 tree rname = NULL_TREE, tname = NULL_TREE;
3127 tree tdecl = NULL_TREE;
3129 if ((int) rid_index < (int) RID_MAX)
3130 rname = ridpointers[(int) rid_index];
3132 tname = get_identifier (name);
3134 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3135 eliminated. Built-in types should not be looked up name; their
3136 names are keywords that the parser can recognize. However, there
3137 is code in c-common.c that uses identifier_global_value to look
3138 up built-in types by name. */
3141 tdecl = build_decl (TYPE_DECL, tname, type);
3142 DECL_ARTIFICIAL (tdecl) = 1;
3143 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3149 tdecl = build_decl (TYPE_DECL, rname, type);
3150 DECL_ARTIFICIAL (tdecl) = 1;
3152 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3155 if (!TYPE_NAME (type))
3156 TYPE_NAME (type) = tdecl;
3159 debug_hooks->type_decl (tdecl, 0);
3162 /* Record one of the standard Java types.
3163 * Declare it as having the given NAME.
3164 * If SIZE > 0, it is the size of one of the integral types;
3165 * otherwise it is the negative of the size of one of the other types. */
3168 record_builtin_java_type (const char* name, int size)
3172 type = make_signed_type (size);
3173 else if (size > -32)
3174 { /* "__java_char" or ""__java_boolean". */
3175 type = make_unsigned_type (-size);
3176 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3179 { /* "__java_float" or ""__java_double". */
3180 type = make_node (REAL_TYPE);
3181 TYPE_PRECISION (type) = - size;
3184 record_builtin_type (RID_MAX, name, type);
3185 decl = TYPE_NAME (type);
3187 /* Suppress generate debug symbol entries for these types,
3188 since for normal C++ they are just clutter.
3189 However, push_lang_context undoes this if extern "Java" is seen. */
3190 DECL_IGNORED_P (decl) = 1;
3192 TYPE_FOR_JAVA (type) = 1;
3196 /* Push a type into the namespace so that the back ends ignore it. */
3199 record_unknown_type (tree type, const char* name)
3201 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3202 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3203 DECL_IGNORED_P (decl) = 1;
3204 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3205 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3206 TYPE_ALIGN (type) = 1;
3207 TYPE_USER_ALIGN (type) = 0;
3208 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3211 /* A string for which we should create an IDENTIFIER_NODE at
3214 typedef struct predefined_identifier
3216 /* The name of the identifier. */
3217 const char *const name;
3218 /* The place where the IDENTIFIER_NODE should be stored. */
3220 /* Nonzero if this is the name of a constructor or destructor. */
3221 const int ctor_or_dtor_p;
3222 } predefined_identifier;
3224 /* Create all the predefined identifiers. */
3227 initialize_predefined_identifiers (void)
3229 const predefined_identifier *pid;
3231 /* A table of identifiers to create at startup. */
3232 static const predefined_identifier predefined_identifiers[] = {
3233 { "C++", &lang_name_cplusplus, 0 },
3234 { "C", &lang_name_c, 0 },
3235 { "Java", &lang_name_java, 0 },
3236 /* Some of these names have a trailing space so that it is
3237 impossible for them to conflict with names written by users. */
3238 { "__ct ", &ctor_identifier, 1 },
3239 { "__base_ctor ", &base_ctor_identifier, 1 },
3240 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3241 { "__dt ", &dtor_identifier, 1 },
3242 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3243 { "__base_dtor ", &base_dtor_identifier, 1 },
3244 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3245 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3246 { "nelts", &nelts_identifier, 0 },
3247 { THIS_NAME, &this_identifier, 0 },
3248 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3249 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3250 { "_vptr", &vptr_identifier, 0 },
3251 { "__vtt_parm", &vtt_parm_identifier, 0 },
3252 { "::", &global_scope_name, 0 },
3253 { "std", &std_identifier, 0 },
3257 for (pid = predefined_identifiers; pid->name; ++pid)
3259 *pid->node = get_identifier (pid->name);
3260 if (pid->ctor_or_dtor_p)
3261 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3265 /* Create the predefined scalar types of C,
3266 and some nodes representing standard constants (0, 1, (void *)0).
3267 Initialize the global binding level.
3268 Make definitions for built-in primitive functions. */
3271 cxx_init_decl_processing (void)
3274 tree void_ftype_ptr;
3276 build_common_tree_nodes (flag_signed_char, false);
3278 /* Create all the identifiers we need. */
3279 initialize_predefined_identifiers ();
3281 /* Create the global variables. */
3282 push_to_top_level ();
3284 current_function_decl = NULL_TREE;
3285 current_binding_level = NULL;
3286 /* Enter the global namespace. */
3287 gcc_assert (global_namespace == NULL_TREE);
3288 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3290 TREE_PUBLIC (global_namespace) = 1;
3291 begin_scope (sk_namespace, global_namespace);
3293 current_lang_name = NULL_TREE;
3295 if (flag_visibility_ms_compat)
3296 default_visibility = VISIBILITY_HIDDEN;
3299 current_lang_name = lang_name_c;
3301 /* Create the `std' namespace. */
3302 push_namespace (std_identifier);
3303 std_node = current_namespace;
3306 c_common_nodes_and_builtins ();
3308 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3309 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3310 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3311 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3312 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3313 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3314 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3315 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3317 integer_two_node = build_int_cst (NULL_TREE, 2);
3318 integer_three_node = build_int_cst (NULL_TREE, 3);
3320 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3321 truthvalue_type_node = boolean_type_node;
3322 truthvalue_false_node = boolean_false_node;
3323 truthvalue_true_node = boolean_true_node;
3325 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3328 record_builtin_type (RID_MAX, NULL, string_type_node);
3331 delta_type_node = ptrdiff_type_node;
3332 vtable_index_type = ptrdiff_type_node;
3334 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3335 void_ftype = build_function_type (void_type_node, void_list_node);
3336 void_ftype_ptr = build_function_type (void_type_node,
3337 tree_cons (NULL_TREE,
3341 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3343 /* C++ extensions */
3345 unknown_type_node = make_node (UNKNOWN_TYPE);
3346 record_unknown_type (unknown_type_node, "unknown type");
3348 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3349 TREE_TYPE (unknown_type_node) = unknown_type_node;
3351 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3353 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3354 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3356 init_list_type_node = make_node (UNKNOWN_TYPE);
3357 record_unknown_type (init_list_type_node, "init list");
3360 /* Make sure we get a unique function type, so we can give
3361 its pointer type a name. (This wins for gdb.) */
3362 tree vfunc_type = make_node (FUNCTION_TYPE);
3363 TREE_TYPE (vfunc_type) = integer_type_node;
3364 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3365 layout_type (vfunc_type);
3367 vtable_entry_type = build_pointer_type (vfunc_type);
3369 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3372 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3373 layout_type (vtbl_type_node);
3374 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3375 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3376 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3377 layout_type (vtbl_ptr_type_node);
3378 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3380 push_namespace (get_identifier ("__cxxabiv1"));
3381 abi_node = current_namespace;
3384 global_type_node = make_node (LANG_TYPE);
3385 record_unknown_type (global_type_node, "global type");
3388 current_lang_name = lang_name_cplusplus;
3392 tree bad_alloc_type_node;
3393 tree bad_alloc_decl;
3394 tree newtype, deltype;
3395 tree ptr_ftype_sizetype;
3397 push_namespace (std_identifier);
3398 bad_alloc_id = get_identifier ("bad_alloc");
3399 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3400 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3402 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3403 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3404 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3408 = build_function_type (ptr_type_node,
3409 tree_cons (NULL_TREE,
3412 newtype = build_exception_variant
3413 (ptr_ftype_sizetype, add_exception_specifier
3414 (NULL_TREE, bad_alloc_type_node, -1));
3415 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3416 push_cp_library_fn (NEW_EXPR, newtype);
3417 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3418 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3419 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3423 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3425 /* Perform other language dependent initializations. */
3426 init_class_processing ();
3427 init_rtti_processing ();
3429 if (flag_exceptions)
3430 init_exception_processing ();
3432 if (! supports_one_only ())
3435 make_fname_decl = cp_make_fname_decl;
3436 start_fname_decls ();
3438 /* Show we use EH for cleanups. */
3439 if (flag_exceptions)
3440 using_eh_for_cleanups ();
3443 /* Generate an initializer for a function naming variable from
3444 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3445 filled in with the type of the init. */
3448 cp_fname_init (const char* name, tree *type_p)
3450 tree domain = NULL_TREE;
3452 tree init = NULL_TREE;
3457 length = strlen (name);
3458 domain = build_index_type (size_int (length));
3459 init = build_string (length + 1, name);
3462 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3463 type = build_cplus_array_type (type, domain);
3468 TREE_TYPE (init) = type;
3470 init = error_mark_node;
3475 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3476 decl, NAME is the initialization string and TYPE_DEP indicates whether
3477 NAME depended on the type of the function. We make use of that to detect
3478 __PRETTY_FUNCTION__ inside a template fn. This is being done
3479 lazily at the point of first use, so we mustn't push the decl now. */
3482 cp_make_fname_decl (tree id, int type_dep)
3484 const char *const name = (type_dep && processing_template_decl
3485 ? NULL : fname_as_string (type_dep));
3487 tree init = cp_fname_init (name, &type);
3488 tree decl = build_decl (VAR_DECL, id, type);
3491 free (CONST_CAST (char *, name));
3493 /* As we're using pushdecl_with_scope, we must set the context. */
3494 DECL_CONTEXT (decl) = current_function_decl;
3495 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3497 TREE_STATIC (decl) = 1;
3498 TREE_READONLY (decl) = 1;
3499 DECL_ARTIFICIAL (decl) = 1;
3501 TREE_USED (decl) = 1;
3503 if (current_function_decl)
3505 struct cp_binding_level *b = current_binding_level;
3506 while (b->level_chain->kind != sk_function_parms)
3508 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3509 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3510 LOOKUP_ONLYCONVERTING);
3513 pushdecl_top_level_and_finish (decl, init);
3519 builtin_function_1 (tree decl, tree context, bool is_global)
3521 tree id = DECL_NAME (decl);
3522 const char *name = IDENTIFIER_POINTER (id);
3524 retrofit_lang_decl (decl);
3526 /* All nesting of C++ functions is lexical; there is never a "static
3527 chain" in the sense of GNU C nested functions. */
3528 DECL_NO_STATIC_CHAIN (decl) = 1;
3530 DECL_ARTIFICIAL (decl) = 1;
3531 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3532 SET_DECL_LANGUAGE (decl, lang_c);
3533 /* Runtime library routines are, by definition, available in an
3534 external shared object. */
3535 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3536 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3538 DECL_CONTEXT (decl) = context;
3541 pushdecl_top_level (decl);
3545 /* A function in the user's namespace should have an explicit
3546 declaration before it is used. Mark the built-in function as
3547 anticipated but not actually declared. */
3548 if (name[0] != '_' || name[1] != '_')
3549 DECL_ANTICIPATED (decl) = 1;
3550 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3552 size_t len = strlen (name);
3554 /* Treat __*_chk fortification functions as anticipated as well,
3555 unless they are __builtin_*. */
3556 if (len > strlen ("___chk")
3557 && memcmp (name + len - strlen ("_chk"),
3558 "_chk", strlen ("_chk") + 1) == 0)
3559 DECL_ANTICIPATED (decl) = 1;
3566 cxx_builtin_function (tree decl)
3568 tree id = DECL_NAME (decl);
3569 const char *name = IDENTIFIER_POINTER (id);
3570 /* All builtins that don't begin with an '_' should additionally
3571 go in the 'std' namespace. */
3574 tree decl2 = copy_node(decl);
3575 push_namespace (std_identifier);
3576 builtin_function_1 (decl2, std_node, false);
3580 return builtin_function_1 (decl, NULL_TREE, false);
3583 /* Like cxx_builtin_function, but guarantee the function is added to the global
3584 scope. This is to allow function specific options to add new machine
3585 dependent builtins when the target ISA changes via attribute((target(...)))
3586 which saves space on program startup if the program does not use non-generic
3590 cxx_builtin_function_ext_scope (tree decl)
3593 tree id = DECL_NAME (decl);
3594 const char *name = IDENTIFIER_POINTER (id);
3595 /* All builtins that don't begin with an '_' should additionally
3596 go in the 'std' namespace. */
3599 tree decl2 = copy_node(decl);
3600 push_namespace (std_identifier);
3601 builtin_function_1 (decl2, std_node, true);
3605 return builtin_function_1 (decl, NULL_TREE, true);
3608 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3609 function. Not called directly. */
3612 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3614 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3615 DECL_EXTERNAL (fn) = 1;
3616 TREE_PUBLIC (fn) = 1;
3617 DECL_ARTIFICIAL (fn) = 1;
3618 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3619 SET_DECL_LANGUAGE (fn, lang_c);
3620 /* Runtime library routines are, by definition, available in an
3621 external shared object. */
3622 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3623 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3627 /* Returns the _DECL for a library function with C linkage.
3628 We assume that such functions never throw; if this is incorrect,
3629 callers should unset TREE_NOTHROW. */
3632 build_library_fn (tree name, tree type)
3634 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3635 TREE_NOTHROW (fn) = 1;
3639 /* Returns the _DECL for a library function with C++ linkage. */
3642 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3644 tree fn = build_library_fn_1 (name, operator_code, type);
3645 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3646 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3647 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3651 /* Like build_library_fn, but takes a C string instead of an
3655 build_library_fn_ptr (const char* name, tree type)
3657 return build_library_fn (get_identifier (name), type);
3660 /* Like build_cp_library_fn, but takes a C string instead of an
3664 build_cp_library_fn_ptr (const char* name, tree type)
3666 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3669 /* Like build_library_fn, but also pushes the function so that we will
3670 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3671 may throw exceptions listed in RAISES. */
3674 push_library_fn (tree name, tree type, tree raises)
3679 type = build_exception_variant (type, raises);
3681 fn = build_library_fn (name, type);
3682 pushdecl_top_level (fn);
3686 /* Like build_cp_library_fn, but also pushes the function so that it
3687 will be found by normal lookup. */
3690 push_cp_library_fn (enum tree_code operator_code, tree type)
3692 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3699 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3703 push_void_library_fn (tree name, tree parmtypes)
3705 tree type = build_function_type (void_type_node, parmtypes);
3706 return push_library_fn (name, type, NULL_TREE);
3709 /* Like push_library_fn, but also note that this function throws
3710 and does not return. Used for __throw_foo and the like. */
3713 push_throw_library_fn (tree name, tree type)
3715 tree fn = push_library_fn (name, type, NULL_TREE);
3716 TREE_THIS_VOLATILE (fn) = 1;
3717 TREE_NOTHROW (fn) = 0;
3721 /* When we call finish_struct for an anonymous union, we create
3722 default copy constructors and such. But, an anonymous union
3723 shouldn't have such things; this function undoes the damage to the
3724 anonymous union type T.
3726 (The reason that we create the synthesized methods is that we don't
3727 distinguish `union { int i; }' from `typedef union { int i; } U'.
3728 The first is an anonymous union; the second is just an ordinary
3732 fixup_anonymous_aggr (tree t)
3736 /* Wipe out memory of synthesized methods. */
3737 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3738 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3739 TYPE_HAS_INIT_REF (t) = 0;
3740 TYPE_HAS_CONST_INIT_REF (t) = 0;
3741 TYPE_HAS_ASSIGN_REF (t) = 0;
3742 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3744 /* Splice the implicitly generated functions out of the TYPE_METHODS
3746 q = &TYPE_METHODS (t);
3749 if (DECL_ARTIFICIAL (*q))
3750 *q = TREE_CHAIN (*q);
3752 q = &TREE_CHAIN (*q);
3755 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3756 if (TYPE_METHODS (t))
3758 tree decl = TYPE_MAIN_DECL (t);
3760 if (TREE_CODE (t) != UNION_TYPE)
3761 error ("%Jan anonymous struct cannot have function members", decl);
3763 error ("%Jan anonymous union cannot have function members", decl);
3766 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3767 assignment operators (because they cannot have these methods themselves).
3768 For anonymous unions this is already checked because they are not allowed
3769 in any union, otherwise we have to check it. */
3770 if (TREE_CODE (t) != UNION_TYPE)
3774 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3775 if (TREE_CODE (field) == FIELD_DECL)
3777 type = TREE_TYPE (field);
3778 if (CLASS_TYPE_P (type))
3780 if (TYPE_NEEDS_CONSTRUCTING (type))
3781 error ("member %q+#D with constructor not allowed "
3782 "in anonymous aggregate", field);
3783 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3784 error ("member %q+#D with destructor not allowed "
3785 "in anonymous aggregate", field);
3786 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3787 error ("member %q+#D with copy assignment operator "
3788 "not allowed in anonymous aggregate", field);
3794 /* Make sure that a declaration with no declarator is well-formed, i.e.
3795 just declares a tagged type or anonymous union.
3797 Returns the type declared; or NULL_TREE if none. */
3800 check_tag_decl (cp_decl_specifier_seq *declspecs)
3802 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3803 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3804 /* If a class, struct, or enum type is declared by the DECLSPECS
3805 (i.e, if a class-specifier, enum-specifier, or non-typename
3806 elaborated-type-specifier appears in the DECLSPECS),
3807 DECLARED_TYPE is set to the corresponding type. */
3808 tree declared_type = NULL_TREE;
3809 bool error_p = false;
3811 if (declspecs->multiple_types_p)
3812 error ("multiple types in one declaration");
3813 else if (declspecs->redefined_builtin_type)
3815 if (!in_system_header)
3816 permerror (input_location, "redeclaration of C++ built-in type %qT",
3817 declspecs->redefined_builtin_type);
3822 && TYPE_P (declspecs->type)
3823 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3824 && MAYBE_CLASS_TYPE_P (declspecs->type))
3825 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3826 declared_type = declspecs->type;
3827 else if (declspecs->type == error_mark_node)
3829 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3830 permerror (input_location, "declaration does not declare anything");
3831 /* Check for an anonymous union. */
3832 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3833 && TYPE_ANONYMOUS_P (declared_type))
3835 /* 7/3 In a simple-declaration, the optional init-declarator-list
3836 can be omitted only when declaring a class (clause 9) or
3837 enumeration (7.2), that is, when the decl-specifier-seq contains
3838 either a class-specifier, an elaborated-type-specifier with
3839 a class-key (9.1), or an enum-specifier. In these cases and
3840 whenever a class-specifier or enum-specifier is present in the
3841 decl-specifier-seq, the identifiers in these specifiers are among
3842 the names being declared by the declaration (as class-name,
3843 enum-names, or enumerators, depending on the syntax). In such
3844 cases, and except for the declaration of an unnamed bit-field (9.6),
3845 the decl-specifier-seq shall introduce one or more names into the
3846 program, or shall redeclare a name introduced by a previous
3847 declaration. [Example:
3848 enum { }; // ill-formed
3849 typedef class { }; // ill-formed
3853 error ("missing type-name in typedef-declaration");
3856 /* Anonymous unions are objects, so they can have specifiers. */;
3857 SET_ANON_AGGR_TYPE_P (declared_type);
3859 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3860 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3865 if (declspecs->specs[(int)ds_inline]
3866 || declspecs->specs[(int)ds_virtual])
3867 error ("%qs can only be specified for functions",
3868 declspecs->specs[(int)ds_inline]
3869 ? "inline" : "virtual");
3871 && (!current_class_type
3872 || current_scope () != current_class_type))
3873 error ("%<friend%> can only be specified inside a class");
3874 else if (declspecs->specs[(int)ds_explicit])
3875 error ("%<explicit%> can only be specified for constructors");
3876 else if (declspecs->storage_class)
3877 error ("a storage class can only be specified for objects "
3879 else if (declspecs->specs[(int)ds_const]
3880 || declspecs->specs[(int)ds_volatile]
3881 || declspecs->specs[(int)ds_restrict]
3882 || declspecs->specs[(int)ds_thread])
3883 error ("qualifiers can only be specified for objects "
3885 else if (saw_typedef)
3886 warning (0, "%<typedef%> was ignored in this declaration");
3889 return declared_type;
3892 /* Called when a declaration is seen that contains no names to declare.
3893 If its type is a reference to a structure, union or enum inherited
3894 from a containing scope, shadow that tag name for the current scope
3895 with a forward reference.
3896 If its type defines a new named structure or union
3897 or defines an enum, it is valid but we need not do anything here.
3898 Otherwise, it is an error.
3900 C++: may have to grok the declspecs to learn about static,
3901 complain for anonymous unions.
3903 Returns the TYPE declared -- or NULL_TREE if none. */
3906 shadow_tag (cp_decl_specifier_seq *declspecs)
3908 tree t = check_tag_decl (declspecs);
3913 if (declspecs->attributes)
3915 warning (0, "attribute ignored in declaration of %q+#T", t);
3916 warning (0, "attribute for %q+#T must follow the %qs keyword",
3917 t, class_key_or_enum_as_string (t));
3921 if (maybe_process_partial_specialization (t) == error_mark_node)
3924 /* This is where the variables in an anonymous union are
3925 declared. An anonymous union declaration looks like:
3927 because there is no declarator after the union, the parser
3928 sends that declaration here. */
3929 if (ANON_AGGR_TYPE_P (t))
3931 fixup_anonymous_aggr (t);
3933 if (TYPE_FIELDS (t))
3935 tree decl = grokdeclarator (/*declarator=*/NULL,
3936 declspecs, NORMAL, 0, NULL);
3937 finish_anon_union (decl);
3944 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3947 groktypename (cp_decl_specifier_seq *type_specifiers,
3948 const cp_declarator *declarator)
3952 attrs = type_specifiers->attributes;
3953 type_specifiers->attributes = NULL_TREE;
3954 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3955 if (attrs && type != error_mark_node)
3957 if (CLASS_TYPE_P (type))
3958 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3959 "outside of definition", type);
3960 else if (MAYBE_CLASS_TYPE_P (type))
3961 /* A template type parameter or other dependent type. */
3962 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3963 "type %qT without an associated declaration", type);
3965 cplus_decl_attributes (&type, attrs, 0);
3970 /* Process a DECLARATOR for a function-scope variable declaration,
3971 namespace-scope variable declaration, or function declaration.
3972 (Function definitions go through start_function; class member
3973 declarations appearing in the body of the class go through
3974 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3975 If an error occurs, the error_mark_node is returned instead.
3977 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
3978 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
3979 for an explicitly defaulted function, or SD_DELETED for an explicitly
3980 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
3981 implicitly initialized via a default constructor. ATTRIBUTES and
3982 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
3983 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
3984 set, the caller is responsible for calling pop_scope. */
3987 start_decl (const cp_declarator *declarator,
3988 cp_decl_specifier_seq *declspecs,
3991 tree prefix_attributes,
3992 tree *pushed_scope_p)
4000 *pushed_scope_p = NULL_TREE;
4002 /* An object declared as __attribute__((deprecated)) suppresses
4003 warnings of uses of other deprecated items. */
4004 if (lookup_attribute ("deprecated", attributes))
4005 deprecated_state = DEPRECATED_SUPPRESS;
4007 attributes = chainon (attributes, prefix_attributes);
4009 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4012 deprecated_state = DEPRECATED_NORMAL;
4014 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4015 || decl == error_mark_node)
4016 return error_mark_node;
4018 type = TREE_TYPE (decl);
4020 context = DECL_CONTEXT (decl);
4024 *pushed_scope_p = push_scope (context);
4026 /* We are only interested in class contexts, later. */
4027 if (TREE_CODE (context) == NAMESPACE_DECL)
4028 context = NULL_TREE;
4032 /* Is it valid for this decl to have an initializer at all?
4033 If not, set INITIALIZED to zero, which will indirectly
4034 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4035 switch (TREE_CODE (decl))
4038 error ("typedef %qD is initialized (use decltype instead)", decl);
4039 return error_mark_node;
4042 if (initialized == SD_DELETED)
4043 /* We'll handle the rest of the semantics later, but we need to
4044 set this now so it's visible to duplicate_decls. */
4045 DECL_DELETED_FN (decl) = 1;
4054 if (! toplevel_bindings_p ()
4055 && DECL_EXTERNAL (decl))
4056 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4058 DECL_EXTERNAL (decl) = 0;
4059 if (toplevel_bindings_p ())
4060 TREE_STATIC (decl) = 1;
4063 /* If this is a typedef that names the class for linkage purposes
4064 (7.1.3p8), apply any attributes directly to the type. */
4065 if (TREE_CODE (decl) == TYPE_DECL
4066 && TAGGED_TYPE_P (TREE_TYPE (decl))
4067 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4068 flags = ATTR_FLAG_TYPE_IN_PLACE;
4072 /* Set attributes here so if duplicate decl, will have proper attributes. */
4073 cplus_decl_attributes (&decl, attributes, flags);
4075 /* Dllimported symbols cannot be defined. Static data members (which
4076 can be initialized in-class and dllimported) go through grokfield,
4077 not here, so we don't need to exclude those decls when checking for
4079 if (initialized && DECL_DLLIMPORT_P (decl))
4081 error ("definition of %q#D is marked %<dllimport%>", decl);
4082 DECL_DLLIMPORT_P (decl) = 0;
4085 /* If #pragma weak was used, mark the decl weak now. */
4086 maybe_apply_pragma_weak (decl);
4088 if (TREE_CODE (decl) == FUNCTION_DECL
4089 && DECL_DECLARED_INLINE_P (decl)
4090 && DECL_UNINLINABLE (decl)
4091 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4092 warning (0, "inline function %q+D given attribute noinline", decl);
4094 if (context && COMPLETE_TYPE_P (complete_type (context)))
4096 if (TREE_CODE (decl) == VAR_DECL)
4098 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4099 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4100 error ("%q#D is not a static member of %q#T", decl, context);
4103 if (DECL_CONTEXT (field) != context)
4105 if (!same_type_p (DECL_CONTEXT (field), context))
4106 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4107 "to be defined as %<%T::%D%>",
4108 DECL_CONTEXT (field), DECL_NAME (decl),
4109 context, DECL_NAME (decl));
4110 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4112 if (processing_specialization
4113 && template_class_depth (context) == 0
4114 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4115 error ("template header not allowed in member definition "
4116 "of explicitly specialized class");
4117 /* Static data member are tricky; an in-class initialization
4118 still doesn't provide a definition, so the in-class
4119 declaration will have DECL_EXTERNAL set, but will have an
4120 initialization. Thus, duplicate_decls won't warn
4121 about this situation, and so we check here. */
4122 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4123 error ("duplicate initialization of %qD", decl);
4124 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4130 tree field = check_classfn (context, decl,
4131 (processing_template_decl
4132 > template_class_depth (context))
4133 ? current_template_parms
4135 if (field && field != error_mark_node
4136 && duplicate_decls (decl, field,
4137 /*newdecl_is_friend=*/false))
4141 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4142 DECL_IN_AGGR_P (decl) = 0;
4143 /* Do not mark DECL as an explicit specialization if it was not
4144 already marked as an instantiation; a declaration should
4145 never be marked as a specialization unless we know what
4146 template is being specialized. */
4147 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4149 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4151 /* [temp.expl.spec] An explicit specialization of a static data
4152 member of a template is a definition if the declaration
4153 includes an initializer; otherwise, it is a declaration.
4155 We check for processing_specialization so this only applies
4156 to the new specialization syntax. */
4157 if (!initialized && processing_specialization)
4158 DECL_EXTERNAL (decl) = 1;
4161 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4162 permerror (input_location, "declaration of %q#D outside of class is not definition",
4166 was_public = TREE_PUBLIC (decl);
4168 /* Enter this declaration into the symbol table. */
4169 decl = maybe_push_decl (decl);
4171 if (processing_template_decl)
4172 decl = push_template_decl (decl);
4173 if (decl == error_mark_node)
4174 return error_mark_node;
4176 /* Tell the back end to use or not use .common as appropriate. If we say
4177 -fconserve-space, we want this to save .data space, at the expense of
4178 wrong semantics. If we say -fno-conserve-space, we want this to
4179 produce errors about redefs; to do this we force variables into the
4181 if (flag_conserve_space
4182 && TREE_CODE (decl) == VAR_DECL
4183 && TREE_PUBLIC (decl)
4184 && !DECL_THREAD_LOCAL_P (decl)
4185 && !have_global_bss_p ())
4186 DECL_COMMON (decl) = 1;
4188 if (TREE_CODE (decl) == VAR_DECL
4189 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4190 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4192 /* This is a const variable with implicit 'static'. Set
4193 DECL_THIS_STATIC so we can tell it from variables that are
4194 !TREE_PUBLIC because of the anonymous namespace. */
4195 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4196 DECL_THIS_STATIC (decl) = 1;
4199 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4200 start_decl_1 (decl, initialized);
4205 /* Process the declaration of a variable DECL. INITIALIZED is true
4206 iff DECL is explicitly initialized. (INITIALIZED is false if the
4207 variable is initialized via an implicitly-called constructor.)
4208 This function must be called for ordinary variables (including, for
4209 example, implicit instantiations of templates), but must not be
4210 called for template declarations. */
4213 start_decl_1 (tree decl, bool initialized)
4217 bool aggregate_definition_p;
4219 gcc_assert (!processing_template_decl);
4221 if (error_operand_p (decl))
4224 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4226 type = TREE_TYPE (decl);
4227 complete_p = COMPLETE_TYPE_P (type);
4228 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4230 /* If an explicit initializer is present, or if this is a definition
4231 of an aggregate, then we need a complete type at this point.
4232 (Scalars are always complete types, so there is nothing to
4233 check.) This code just sets COMPLETE_P; errors (if necessary)
4234 are issued below. */
4235 if ((initialized || aggregate_definition_p)
4237 && COMPLETE_TYPE_P (complete_type (type)))
4240 /* We will not yet have set TREE_READONLY on DECL if the type
4241 was "const", but incomplete, before this point. But, now, we
4242 have a complete type, so we can try again. */
4243 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4247 /* Is it valid for this decl to have an initializer at all? */
4249 /* Don't allow initializations for incomplete types except for
4250 arrays which might be completed by the initialization. */
4252 ; /* A complete type is ok. */
4253 else if (type_uses_auto (type))
4254 ; /* An auto type is ok. */
4255 else if (TREE_CODE (type) != ARRAY_TYPE)
4257 error ("variable %q#D has initializer but incomplete type", decl);
4258 type = TREE_TYPE (decl) = error_mark_node;
4260 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4262 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4263 error ("elements of array %q#D have incomplete type", decl);
4264 /* else we already gave an error in start_decl. */
4267 else if (aggregate_definition_p && !complete_p)
4269 if (type_uses_auto (type))
4270 error ("declaration of %q#D has no initializer", decl);
4272 error ("aggregate %q#D has incomplete type and cannot be defined",
4274 /* Change the type so that assemble_variable will give
4275 DECL an rtl we can live with: (mem (const_int 0)). */
4276 type = TREE_TYPE (decl) = error_mark_node;
4279 /* Create a new scope to hold this declaration if necessary.
4280 Whether or not a new scope is necessary cannot be determined
4281 until after the type has been completed; if the type is a
4282 specialization of a class template it is not until after
4283 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4284 will be set correctly. */
4285 maybe_push_cleanup_level (type);
4288 /* Handle initialization of references. DECL, TYPE, and INIT have the
4289 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4290 but will be set to a new CLEANUP_STMT if a temporary is created
4291 that must be destroyed subsequently.
4293 Returns an initializer expression to use to initialize DECL, or
4294 NULL if the initialization can be performed statically.
4296 Quotes on semantics can be found in ARM 8.4.3. */
4299 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4303 if (init == NULL_TREE)
4305 if ((DECL_LANG_SPECIFIC (decl) == 0
4306 || DECL_IN_AGGR_P (decl) == 0)
4307 && ! DECL_THIS_EXTERN (decl))
4308 error ("%qD declared as reference but not initialized", decl);
4312 if (TREE_CODE (init) == CONSTRUCTOR)
4314 error ("ISO C++ forbids use of initializer list to "
4315 "initialize reference %qD", decl);
4319 if (TREE_CODE (init) == TREE_LIST)
4320 init = build_x_compound_expr_from_list (init, "initializer");
4322 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4323 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4324 /* Note: default conversion is only called in very special cases. */
4325 init = decay_conversion (init);
4327 /* Convert INIT to the reference type TYPE. This may involve the
4328 creation of a temporary, whose lifetime must be the same as that
4329 of the reference. If so, a DECL_EXPR for the temporary will be
4330 added just after the DECL_EXPR for DECL. That's why we don't set
4331 DECL_INITIAL for local references (instead assigning to them
4332 explicitly); we need to allow the temporary to be initialized
4334 tmp = initialize_reference (type, init, decl, cleanup);
4336 if (tmp == error_mark_node)
4338 else if (tmp == NULL_TREE)
4340 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4344 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4347 DECL_INITIAL (decl) = tmp;
4352 /* Subroutine of check_initializer. We're initializing a DECL of
4353 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4354 extend the lifetime of the underlying array to match that of the decl,
4355 just like for reference initialization. CLEANUP is as for
4356 grok_reference_init. */
4359 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4361 tree aggr_init, array, arrtype;
4362 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4363 aggr_init = TARGET_EXPR_INITIAL (init);
4364 init = build2 (INIT_EXPR, type, decl, init);
4366 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4367 arrtype = TREE_TYPE (array);
4369 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4370 array = TREE_OPERAND (array, 0);
4371 /* If the array is constant, finish_compound_literal already made it a
4372 static variable and we don't need to do anything here. */
4373 if (decl && TREE_CODE (array) == TARGET_EXPR)
4376 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4377 var = build_address (var);
4378 var = convert (arrtype, var);
4379 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4380 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4385 /* Designated initializers in arrays are not supported in GNU C++.
4386 The parser cannot detect this error since it does not know whether
4387 a given brace-enclosed initializer is for a class type or for an
4388 array. This function checks that CE does not use a designated
4389 initializer. If it does, an error is issued. Returns true if CE
4390 is valid, i.e., does not have a designated initializer. */
4393 check_array_designated_initializer (const constructor_elt *ce)
4395 /* Designated initializers for array elements are not supported. */
4398 /* The parser only allows identifiers as designated
4400 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4401 error ("name %qD used in a GNU-style designated "
4402 "initializer for an array", ce->index);
4409 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4410 array until we finish parsing the initializer. If that's the
4411 situation we're in, update DECL accordingly. */
4414 maybe_deduce_size_from_array_init (tree decl, tree init)
4416 tree type = TREE_TYPE (decl);
4418 if (TREE_CODE (type) == ARRAY_TYPE
4419 && TYPE_DOMAIN (type) == NULL_TREE
4420 && TREE_CODE (decl) != TYPE_DECL)
4422 /* do_default is really a C-ism to deal with tentative definitions.
4423 But let's leave it here to ease the eventual merge. */
4424 int do_default = !DECL_EXTERNAL (decl);
4425 tree initializer = init ? init : DECL_INITIAL (decl);
4428 /* Check that there are no designated initializers in INIT, as
4429 those are not supported in GNU C++, and as the middle-end
4430 will crash if presented with a non-numeric designated
4432 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4434 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4435 constructor_elt *ce;
4438 VEC_iterate (constructor_elt, v, i, ce);
4440 if (!check_array_designated_initializer (ce))
4446 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4450 error ("initializer fails to determine size of %qD", decl);
4451 TREE_TYPE (decl) = error_mark_node;
4453 else if (failure == 2)
4457 error ("array size missing in %qD", decl);
4458 TREE_TYPE (decl) = error_mark_node;
4460 /* If a `static' var's size isn't known, make it extern as
4461 well as static, so it does not get allocated. If it's not
4462 `static', then don't mark it extern; finish_incomplete_decl
4463 will give it a default size and it will get allocated. */
4464 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4465 DECL_EXTERNAL (decl) = 1;
4467 else if (failure == 3)
4469 error ("zero-size array %qD", decl);
4470 TREE_TYPE (decl) = error_mark_node;
4474 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4476 layout_decl (decl, 0);
4480 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4481 any appropriate error messages regarding the layout. */
4484 layout_var_decl (tree decl)
4488 type = TREE_TYPE (decl);
4489 if (type == error_mark_node)
4492 /* If we haven't already layed out this declaration, do so now.
4493 Note that we must not call complete type for an external object
4494 because it's type might involve templates that we are not
4495 supposed to instantiate yet. (And it's perfectly valid to say
4496 `extern X x' for some incomplete type `X'.) */
4497 if (!DECL_EXTERNAL (decl))
4498 complete_type (type);
4499 if (!DECL_SIZE (decl)
4500 && TREE_TYPE (decl) != error_mark_node
4501 && (COMPLETE_TYPE_P (type)
4502 || (TREE_CODE (type) == ARRAY_TYPE
4503 && !TYPE_DOMAIN (type)
4504 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4505 layout_decl (decl, 0);
4507 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4509 /* An automatic variable with an incomplete type: that is an error.
4510 Don't talk about array types here, since we took care of that
4511 message in grokdeclarator. */
4512 error ("storage size of %qD isn't known", decl);
4513 TREE_TYPE (decl) = error_mark_node;
4516 /* Keep this code around in case we later want to control debug info
4517 based on whether a type is "used". (jason 1999-11-11) */
4519 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4520 /* Let debugger know it should output info for this type. */
4521 note_debug_info_needed (ttype);
4523 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4524 note_debug_info_needed (DECL_CONTEXT (decl));
4527 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4528 && DECL_SIZE (decl) != NULL_TREE
4529 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4531 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4532 constant_expression_warning (DECL_SIZE (decl));
4535 error ("storage size of %qD isn't constant", decl);
4536 TREE_TYPE (decl) = error_mark_node;
4541 /* If a local static variable is declared in an inline function, or if
4542 we have a weak definition, we must endeavor to create only one
4543 instance of the variable at link-time. */
4546 maybe_commonize_var (tree decl)
4548 /* Static data in a function with comdat linkage also has comdat
4550 if (TREE_STATIC (decl)
4551 /* Don't mess with __FUNCTION__. */
4552 && ! DECL_ARTIFICIAL (decl)
4553 && DECL_FUNCTION_SCOPE_P (decl)
4554 /* Unfortunately, import_export_decl has not always been called
4555 before the function is processed, so we cannot simply check
4557 && (DECL_COMDAT (DECL_CONTEXT (decl))
4558 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4559 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4560 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4564 /* With weak symbols, we simply make the variable COMDAT;
4565 that will cause copies in multiple translations units to
4567 comdat_linkage (decl);
4571 if (DECL_INITIAL (decl) == NULL_TREE
4572 || DECL_INITIAL (decl) == error_mark_node)
4574 /* Without weak symbols, we can use COMMON to merge
4575 uninitialized variables. */
4576 TREE_PUBLIC (decl) = 1;
4577 DECL_COMMON (decl) = 1;
4581 /* While for initialized variables, we must use internal
4582 linkage -- which means that multiple copies will not
4584 TREE_PUBLIC (decl) = 0;
4585 DECL_COMMON (decl) = 0;
4586 warning (0, "sorry: semantics of inline function static "
4587 "data %q+#D are wrong (you'll wind up "
4588 "with multiple copies)", decl);
4589 warning (0, "%J you can work around this by removing "
4595 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4596 /* Set it up again; we might have set DECL_INITIAL since the last
4598 comdat_linkage (decl);
4601 /* Issue an error message if DECL is an uninitialized const variable. */
4604 check_for_uninitialized_const_var (tree decl)
4606 tree type = TREE_TYPE (decl);
4608 /* ``Unless explicitly declared extern, a const object does not have
4609 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4611 if (TREE_CODE (decl) == VAR_DECL
4612 && TREE_CODE (type) != REFERENCE_TYPE
4613 && CP_TYPE_CONST_P (type)
4614 && !TYPE_NEEDS_CONSTRUCTING (type)
4615 && !DECL_INITIAL (decl))
4616 error ("uninitialized const %qD", decl);
4620 /* Structure holding the current initializer being processed by reshape_init.
4621 CUR is a pointer to the current element being processed, END is a pointer
4622 after the last element present in the initializer. */
4623 typedef struct reshape_iterator_t
4625 constructor_elt *cur;
4626 constructor_elt *end;
4629 static tree reshape_init_r (tree, reshape_iter *, bool);
4631 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4632 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4633 initialized. If there are no more such fields, the return value
4637 next_initializable_field (tree field)
4640 && (TREE_CODE (field) != FIELD_DECL
4641 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4642 || DECL_ARTIFICIAL (field)))
4643 field = TREE_CHAIN (field);
4648 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4649 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4650 INTEGER_CST representing the size of the array minus one (the maximum index),
4651 or NULL_TREE if the array was declared without specifying the size. D is
4652 the iterator within the constructor. */
4655 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4658 bool sized_array_p = (max_index != NULL_TREE);
4659 unsigned HOST_WIDE_INT max_index_cst = 0;
4660 unsigned HOST_WIDE_INT index;
4662 /* The initializer for an array is always a CONSTRUCTOR. */
4663 new_init = build_constructor (init_list_type_node, NULL);
4667 /* Minus 1 is used for zero sized arrays. */
4668 if (integer_all_onesp (max_index))
4671 if (host_integerp (max_index, 1))
4672 max_index_cst = tree_low_cst (max_index, 1);
4673 /* sizetype is sign extended, not zero extended. */
4675 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4679 /* Loop until there are no more initializers. */
4681 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4686 check_array_designated_initializer (d->cur);
4687 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4688 if (elt_init == error_mark_node)
4689 return error_mark_node;
4690 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4696 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4697 Parameters are the same of reshape_init_r. */
4700 reshape_init_array (tree type, reshape_iter *d)
4702 tree max_index = NULL_TREE;
4704 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4706 if (TYPE_DOMAIN (type))
4707 max_index = array_type_nelts (type);
4709 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4712 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4713 Parameters are the same of reshape_init_r. */
4716 reshape_init_vector (tree type, reshape_iter *d)
4718 tree max_index = NULL_TREE;
4721 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4723 if (COMPOUND_LITERAL_P (d->cur->value))
4725 tree value = d->cur->value;
4726 if (!same_type_p (TREE_TYPE (value), type))
4728 error ("invalid type %qT as initializer for a vector of type %qT",
4729 TREE_TYPE (d->cur->value), type);
4730 value = error_mark_node;
4736 /* For a vector, the representation type is a struct
4737 containing a single member which is an array of the
4738 appropriate size. */
4739 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4740 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4741 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4743 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4746 /* Subroutine of reshape_init_r, processes the initializers for classes
4747 or union. Parameters are the same of reshape_init_r. */
4750 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4755 gcc_assert (CLASS_TYPE_P (type));
4757 /* The initializer for a class is always a CONSTRUCTOR. */
4758 new_init = build_constructor (init_list_type_node, NULL);
4759 field = next_initializable_field (TYPE_FIELDS (type));
4765 An initializer for an aggregate member that is an
4766 empty class shall have the form of an empty
4767 initializer-list {}. */
4768 if (!first_initializer_p)
4770 error ("initializer for %qT must be brace-enclosed", type);
4771 return error_mark_node;
4776 /* Loop through the initializable fields, gathering initializers. */
4777 while (d->cur != d->end)
4781 /* Handle designated initializers, as an extension. */
4784 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4786 if (!field || TREE_CODE (field) != FIELD_DECL)
4788 error ("%qT has no non-static data member named %qD", type,
4790 return error_mark_node;
4794 /* If we processed all the member of the class, we are done. */
4798 field_init = reshape_init_r (TREE_TYPE (field), d,
4799 /*first_initializer_p=*/false);
4800 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4804 When a union is initialized with a brace-enclosed
4805 initializer, the braces shall only contain an
4806 initializer for the first member of the union. */
4807 if (TREE_CODE (type) == UNION_TYPE)
4810 field = next_initializable_field (TREE_CHAIN (field));
4816 /* Subroutine of reshape_init, which processes a single initializer (part of
4817 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4818 iterator within the CONSTRUCTOR which points to the initializer to process.
4819 FIRST_INITIALIZER_P is true if this is the first initializer of the
4820 CONSTRUCTOR node. */
4823 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4825 tree init = d->cur->value;
4827 if (error_operand_p (init))
4828 return error_mark_node;
4830 /* A non-aggregate type is always initialized with a single
4832 if (!CP_AGGREGATE_TYPE_P (type))
4834 /* It is invalid to initialize a non-aggregate type with a
4835 brace-enclosed initializer before C++0x.
4836 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4837 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4838 a CONSTRUCTOR (with a record type). */
4839 if (TREE_CODE (init) == CONSTRUCTOR
4840 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4842 if (SCALAR_TYPE_P (type))
4844 error ("braces around scalar initializer for type %qT", type);
4845 init = error_mark_node;
4848 maybe_warn_cpp0x ("extended initializer lists");
4857 All implicit type conversions (clause _conv_) are considered when
4858 initializing the aggregate member with an initializer from an
4859 initializer-list. If the initializer can initialize a member,
4860 the member is initialized. Otherwise, if the member is itself a
4861 non-empty subaggregate, brace elision is assumed and the
4862 initializer is considered for the initialization of the first
4863 member of the subaggregate. */
4864 if (TREE_CODE (init) != CONSTRUCTOR
4865 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4871 /* [dcl.init.string]
4873 A char array (whether plain char, signed char, or unsigned char)
4874 can be initialized by a string-literal (optionally enclosed in
4875 braces); a wchar_t array can be initialized by a wide
4876 string-literal (optionally enclosed in braces). */
4877 if (TREE_CODE (type) == ARRAY_TYPE
4878 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4880 tree str_init = init;
4882 /* Strip one level of braces if and only if they enclose a single
4883 element (as allowed by [dcl.init.string]). */
4884 if (!first_initializer_p
4885 && TREE_CODE (str_init) == CONSTRUCTOR
4886 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4888 str_init = VEC_index (constructor_elt,
4889 CONSTRUCTOR_ELTS (str_init), 0)->value;
4892 /* If it's a string literal, then it's the initializer for the array
4893 as a whole. Otherwise, continue with normal initialization for
4894 array types (one value per array element). */
4895 if (TREE_CODE (str_init) == STRING_CST)
4902 /* The following cases are about aggregates. If we are not within a full
4903 initializer already, and there is not a CONSTRUCTOR, it means that there
4904 is a missing set of braces (that is, we are processing the case for
4905 which reshape_init exists). */
4906 if (!first_initializer_p)
4908 if (TREE_CODE (init) == CONSTRUCTOR)
4910 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4911 /* There is no need to reshape pointer-to-member function
4912 initializers, as they are always constructed correctly
4913 by the front end. */
4915 else if (COMPOUND_LITERAL_P (init))
4916 /* For a nested compound literal, there is no need to reshape since
4917 brace elision is not allowed. Even if we decided to allow it,
4918 we should add a call to reshape_init in finish_compound_literal,
4919 before calling digest_init, so changing this code would still
4920 not be necessary. */
4921 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4925 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4926 return reshape_init (type, init);
4930 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4934 /* Dispatch to specialized routines. */
4935 if (CLASS_TYPE_P (type))
4936 return reshape_init_class (type, d, first_initializer_p);
4937 else if (TREE_CODE (type) == ARRAY_TYPE)
4938 return reshape_init_array (type, d);
4939 else if (TREE_CODE (type) == VECTOR_TYPE)
4940 return reshape_init_vector (type, d);
4945 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4946 brace-enclosed aggregate initializer.
4948 INIT is the CONSTRUCTOR containing the list of initializers describing
4949 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4950 It may not presently match the shape of the TYPE; for example:
4952 struct S { int a; int b; };
4953 struct S a[] = { 1, 2, 3, 4 };
4955 Here INIT will hold a VEC of four elements, rather than a
4956 VEC of two elements, each itself a VEC of two elements. This
4957 routine transforms INIT from the former form into the latter. The
4958 revised CONSTRUCTOR node is returned. */
4961 reshape_init (tree type, tree init)
4963 VEC(constructor_elt, gc) *v;
4967 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4969 v = CONSTRUCTOR_ELTS (init);
4971 /* An empty constructor does not need reshaping, and it is always a valid
4973 if (VEC_empty (constructor_elt, v))
4976 /* Recurse on this CONSTRUCTOR. */
4977 d.cur = VEC_index (constructor_elt, v, 0);
4978 d.end = d.cur + VEC_length (constructor_elt, v);
4980 new_init = reshape_init_r (type, &d, true);
4981 if (new_init == error_mark_node)
4982 return error_mark_node;
4984 /* Make sure all the element of the constructor were used. Otherwise,
4985 issue an error about exceeding initializers. */
4987 error ("too many initializers for %qT", type);
4992 /* Verify array initializer. Returns true if errors have been reported. */
4995 check_array_initializer (tree decl, tree type, tree init)
4997 tree element_type = TREE_TYPE (type);
4999 /* The array type itself need not be complete, because the
5000 initializer may tell us how many elements are in the array.
5001 But, the elements of the array must be complete. */
5002 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5005 error ("elements of array %q#D have incomplete type", decl);
5007 error ("elements of array %q#T have incomplete type", type);
5010 /* It is not valid to initialize a VLA. */
5012 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5013 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5016 error ("variable-sized object %qD may not be initialized", decl);
5018 error ("variable-sized compound literal");
5024 /* Subroutine of check_initializer; args are passed down from that function.
5025 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5028 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5031 int saved_stmts_are_full_exprs_p = 0;
5032 if (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;
5037 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5038 if (building_stmt_tree ())
5039 current_stmt_tree ()->stmts_are_full_exprs_p =
5040 saved_stmts_are_full_exprs_p;
5044 /* Verify INIT (the initializer for DECL), and record the
5045 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5046 grok_reference_init.
5048 If the return value is non-NULL, it is an expression that must be
5049 evaluated dynamically to initialize DECL. */
5052 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5054 tree type = TREE_TYPE (decl);
5055 tree init_code = NULL;
5057 /* Things that are going to be initialized need to have complete
5059 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5061 if (type == error_mark_node)
5062 /* We will have already complained. */
5065 if (TREE_CODE (type) == ARRAY_TYPE)
5067 if (check_array_initializer (decl, type, init))
5070 else if (!COMPLETE_TYPE_P (type))
5072 error ("%qD has incomplete type", decl);
5073 TREE_TYPE (decl) = error_mark_node;
5077 /* There is no way to make a variable-sized class type in GNU C++. */
5078 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5080 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5082 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5083 if (SCALAR_TYPE_P (type))
5087 maybe_warn_cpp0x ("extended initializer lists");
5088 init = build_zero_init (type, NULL_TREE, false);
5090 else if (init_len != 1)
5092 error ("scalar object %qD requires one element in initializer",
5094 TREE_TYPE (decl) = error_mark_node;
5100 if (TREE_CODE (decl) == CONST_DECL)
5102 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5104 DECL_INITIAL (decl) = init;
5106 gcc_assert (init != NULL_TREE);
5109 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5110 init = grok_reference_init (decl, type, init, cleanup);
5113 /* Do not reshape constructors of vectors (they don't need to be
5115 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5117 if (is_std_init_list (type))
5118 return build_init_list_var_init (decl, type, init, cleanup);
5119 else if (TYPE_NON_AGGREGATE_CLASS (type))
5121 /* Don't reshape if the class has constructors. */
5122 if (cxx_dialect == cxx98)
5123 error ("in C++98 %qD must be initialized by constructor, "
5126 init = build_tree_list (NULL_TREE, init);
5128 else if ((*targetm.vector_opaque_p) (type))
5130 error ("opaque vector types cannot be initialized");
5131 init = error_mark_node;
5134 init = reshape_init (type, init);
5137 /* If DECL has an array type without a specific bound, deduce the
5138 array size from the initializer. */
5139 maybe_deduce_size_from_array_init (decl, init);
5140 type = TREE_TYPE (decl);
5141 if (type == error_mark_node)
5144 if (TYPE_NEEDS_CONSTRUCTING (type)
5145 || (CLASS_TYPE_P (type)
5146 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5147 return build_aggr_init_full_exprs (decl, init, flags);
5148 else if (TREE_CODE (init) != TREE_VEC)
5150 init_code = store_init_value (decl, init);
5151 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5152 && DECL_INITIAL (decl)
5153 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5154 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5155 warning (0, "array %qD initialized by parenthesized string literal %qE",
5156 decl, DECL_INITIAL (decl));
5160 else if (DECL_EXTERNAL (decl))
5162 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5163 return build_aggr_init_full_exprs (decl, init, flags);
5164 else if (MAYBE_CLASS_TYPE_P (type))
5166 tree core_type = strip_array_types (type);
5168 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5169 error ("structure %qD with uninitialized const members", decl);
5170 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5171 error ("structure %qD with uninitialized reference members", decl);
5173 check_for_uninitialized_const_var (decl);
5176 check_for_uninitialized_const_var (decl);
5178 if (init && init != error_mark_node)
5179 init_code = build2 (INIT_EXPR, type, decl, init);
5184 /* If DECL is not a local variable, give it RTL. */
5187 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5189 int toplev = toplevel_bindings_p ();
5191 const char *filename;
5193 /* Set the DECL_ASSEMBLER_NAME for the object. */
5196 /* The `register' keyword, when used together with an
5197 asm-specification, indicates that the variable should be
5198 placed in a particular register. */
5199 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5201 set_user_assembler_name (decl, asmspec);
5202 DECL_HARD_REGISTER (decl) = 1;
5206 if (TREE_CODE (decl) == FUNCTION_DECL
5207 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5208 set_builtin_user_assembler_name (decl, asmspec);
5209 set_user_assembler_name (decl, asmspec);
5213 /* Handle non-variables up front. */
5214 if (TREE_CODE (decl) != VAR_DECL)
5216 rest_of_decl_compilation (decl, toplev, at_eof);
5220 /* If we see a class member here, it should be a static data
5222 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5224 gcc_assert (TREE_STATIC (decl));
5225 /* An in-class declaration of a static data member should be
5226 external; it is only a declaration, and not a definition. */
5227 if (init == NULL_TREE)
5228 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5231 /* We don't create any RTL for local variables. */
5232 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5235 /* We defer emission of local statics until the corresponding
5236 DECL_EXPR is expanded. */
5237 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5239 /* We try to defer namespace-scope static constants so that they are
5240 not emitted into the object file unnecessarily. */
5241 filename = input_filename;
5242 if (!DECL_VIRTUAL_P (decl)
5243 && TREE_READONLY (decl)
5244 && DECL_INITIAL (decl) != NULL_TREE
5245 && DECL_INITIAL (decl) != error_mark_node
5247 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5249 && !TREE_PUBLIC (decl))
5251 /* Fool with the linkage of static consts according to #pragma
5253 struct c_fileinfo *finfo = get_fileinfo (filename);
5254 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5256 TREE_PUBLIC (decl) = 1;
5257 DECL_EXTERNAL (decl) = finfo->interface_only;
5262 /* Likewise for template instantiations. */
5263 else if (DECL_LANG_SPECIFIC (decl)
5264 && DECL_IMPLICIT_INSTANTIATION (decl))
5267 /* If we're not deferring, go ahead and assemble the variable. */
5269 rest_of_decl_compilation (decl, toplev, at_eof);
5272 /* walk_tree helper for wrap_temporary_cleanups, below. */
5275 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5277 if (TYPE_P (*stmt_p))
5283 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5285 tree guard = (tree)data;
5286 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5288 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5289 /* Tell honor_protect_cleanup_actions to handle this as a separate
5291 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5293 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5299 /* We're initializing a local variable which has a cleanup GUARD. If there
5300 are any temporaries used in the initializer INIT of this variable, we
5301 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5302 variable will be cleaned up properly if one of them throws.
5304 Unfortunately, there's no way to express this properly in terms of
5305 nesting, as the regions for the temporaries overlap the region for the
5306 variable itself; if there are two temporaries, the variable needs to be
5307 the first thing destroyed if either of them throws. However, we only
5308 want to run the variable's cleanup if it actually got constructed. So
5309 we need to guard the temporary cleanups with the variable's cleanup if
5310 they are run on the normal path, but not if they are run on the
5311 exceptional path. We implement this by telling
5312 honor_protect_cleanup_actions to strip the variable cleanup from the
5313 exceptional path. */
5316 wrap_temporary_cleanups (tree init, tree guard)
5318 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5321 /* Generate code to initialize DECL (a local variable). */
5324 initialize_local_var (tree decl, tree init)
5326 tree type = TREE_TYPE (decl);
5330 gcc_assert (TREE_CODE (decl) == VAR_DECL
5331 || TREE_CODE (decl) == RESULT_DECL);
5332 gcc_assert (!TREE_STATIC (decl));
5334 if (DECL_SIZE (decl) == NULL_TREE)
5336 /* If we used it already as memory, it must stay in memory. */
5337 DECL_INITIAL (decl) = NULL_TREE;
5338 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5342 if (type == error_mark_node)
5345 /* Compute and store the initial value. */
5346 already_used = TREE_USED (decl) || TREE_USED (type);
5348 /* Generate a cleanup, if necessary. */
5349 cleanup = cxx_maybe_build_cleanup (decl);
5351 /* Perform the initialization. */
5354 int saved_stmts_are_full_exprs_p;
5356 /* If we're only initializing a single object, guard the destructors
5357 of any temporaries used in its initializer with its destructor.
5358 This isn't right for arrays because each element initialization is
5359 a full-expression. */
5360 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5361 wrap_temporary_cleanups (init, cleanup);
5363 gcc_assert (building_stmt_tree ());
5364 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5365 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5366 finish_expr_stmt (init);
5367 current_stmt_tree ()->stmts_are_full_exprs_p =
5368 saved_stmts_are_full_exprs_p;
5371 /* Set this to 0 so we can tell whether an aggregate which was
5372 initialized was ever used. Don't do this if it has a
5373 destructor, so we don't complain about the 'resource
5374 allocation is initialization' idiom. Now set
5375 attribute((unused)) on types so decls of that type will be
5376 marked used. (see TREE_USED, above.) */
5377 if (TYPE_NEEDS_CONSTRUCTING (type)
5379 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5380 && DECL_NAME (decl))
5381 TREE_USED (decl) = 0;
5382 else if (already_used)
5383 TREE_USED (decl) = 1;
5386 finish_decl_cleanup (decl, cleanup);
5389 /* DECL is a VAR_DECL for a compiler-generated variable with static
5390 storage duration (like a virtual table) whose initializer is a
5391 compile-time constant. INIT must be either a TREE_LIST of values,
5392 or a CONSTRUCTOR. Initialize the variable and provide it to the
5396 initialize_artificial_var (tree decl, tree init)
5398 gcc_assert (DECL_ARTIFICIAL (decl));
5399 if (TREE_CODE (init) == TREE_LIST)
5400 init = build_constructor_from_list (TREE_TYPE (decl), init);
5401 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5402 DECL_INITIAL (decl) = init;
5403 DECL_INITIALIZED_P (decl) = 1;
5404 determine_visibility (decl);
5405 layout_var_decl (decl);
5406 maybe_commonize_var (decl);
5407 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5410 /* INIT is the initializer for a variable, as represented by the
5411 parser. Returns true iff INIT is value-dependent. */
5414 value_dependent_init_p (tree init)
5416 if (TREE_CODE (init) == TREE_LIST)
5417 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5418 return any_value_dependent_elements_p (init);
5419 else if (TREE_CODE (init) == CONSTRUCTOR)
5420 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5422 VEC(constructor_elt, gc) *elts;
5426 elts = CONSTRUCTOR_ELTS (init);
5427 nelts = VEC_length (constructor_elt, elts);
5428 for (i = 0; i < nelts; ++i)
5429 if (value_dependent_init_p (VEC_index (constructor_elt,
5434 /* It must be a simple expression, e.g., int i = 3; */
5435 return value_dependent_expression_p (init);
5440 /* Finish processing of a declaration;
5441 install its line number and initial value.
5442 If the length of an array type is not known before,
5443 it must be determined now, from the initial value, or it is an error.
5445 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5446 true, then INIT is an integral constant expression.
5448 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5449 if the (init) syntax was used. */
5452 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5453 tree asmspec_tree, int flags)
5457 const char *asmspec = NULL;
5458 int was_readonly = 0;
5459 bool var_definition_p = false;
5460 int saved_processing_template_decl;
5463 if (decl == error_mark_node)
5468 error ("assignment (not initialization) in declaration");
5472 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5473 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5474 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5476 type = TREE_TYPE (decl);
5477 if (type == error_mark_node)
5480 /* Assume no cleanup is required. */
5481 cleanup = NULL_TREE;
5482 saved_processing_template_decl = processing_template_decl;
5484 /* If a name was specified, get the string. */
5485 if (global_scope_p (current_binding_level))
5486 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5487 if (asmspec_tree && asmspec_tree != error_mark_node)
5488 asmspec = TREE_STRING_POINTER (asmspec_tree);
5490 if (current_class_type
5491 && CP_DECL_CONTEXT (decl) == current_class_type
5492 && TYPE_BEING_DEFINED (current_class_type)
5493 && (DECL_INITIAL (decl) || init))
5494 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5496 auto_node = type_uses_auto (type);
5497 if (auto_node && !type_dependent_expression_p (init))
5499 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5500 if (type == error_mark_node)
5504 if (processing_template_decl)
5506 bool type_dependent_p;
5508 /* Add this declaration to the statement-tree. */
5509 if (at_function_scope_p ())
5510 add_decl_expr (decl);
5512 type_dependent_p = dependent_type_p (type);
5514 if (check_for_bare_parameter_packs (init))
5517 DECL_INITIAL (decl) = NULL_TREE;
5520 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5522 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5523 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5524 TREE_CONSTANT (decl) = 1;
5527 /* Generally, initializers in templates are expanded when the
5528 template is instantiated. But, if DECL is an integral
5529 constant static data member, then it can be used in future
5530 integral constant expressions, and its value must be
5533 && DECL_CLASS_SCOPE_P (decl)
5534 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5535 && !type_dependent_p
5536 && !value_dependent_init_p (init)))
5539 DECL_INITIAL (decl) = init;
5540 if (TREE_CODE (decl) == VAR_DECL
5541 && !DECL_PRETTY_FUNCTION_P (decl)
5542 && !type_dependent_p)
5543 maybe_deduce_size_from_array_init (decl, init);
5547 if (TREE_CODE (init) == TREE_LIST)
5549 /* If the parenthesized-initializer form was used (e.g.,
5550 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5551 arguments. (There is generally only one.) We convert them
5554 for (; list; list = TREE_CHAIN (list))
5556 tree elt = TREE_VALUE (list);
5557 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5561 init = fold_non_dependent_expr (init);
5562 processing_template_decl = 0;
5565 /* Take care of TYPE_DECLs up front. */
5566 if (TREE_CODE (decl) == TYPE_DECL)
5568 if (type != error_mark_node
5569 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5571 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5572 warning (0, "shadowing previous type declaration of %q#D", decl);
5573 set_identifier_type_value (DECL_NAME (decl), decl);
5576 /* If we have installed this as the canonical typedef for this
5577 type, and that type has not been defined yet, delay emitting
5578 the debug information for it, as we will emit it later. */
5579 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5580 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5581 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5583 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5588 /* A reference will be modified here, as it is initialized. */
5589 if (! DECL_EXTERNAL (decl)
5590 && TREE_READONLY (decl)
5591 && TREE_CODE (type) == REFERENCE_TYPE)
5594 TREE_READONLY (decl) = 0;
5597 if (TREE_CODE (decl) == VAR_DECL)
5599 /* Only PODs can have thread-local storage. Other types may require
5600 various kinds of non-trivial initialization. */
5601 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5602 error ("%qD cannot be thread-local because it has non-POD type %qT",
5603 decl, TREE_TYPE (decl));
5604 /* If this is a local variable that will need a mangled name,
5605 register it now. We must do this before processing the
5606 initializer for the variable, since the initialization might
5607 require a guard variable, and since the mangled name of the
5608 guard variable will depend on the mangled name of this
5610 if (DECL_FUNCTION_SCOPE_P (decl)
5611 && TREE_STATIC (decl)
5612 && !DECL_ARTIFICIAL (decl))
5613 push_local_name (decl);
5614 /* Convert the initializer to the type of DECL, if we have not
5615 already initialized DECL. */
5616 if (!DECL_INITIALIZED_P (decl)
5617 /* If !DECL_EXTERNAL then DECL is being defined. In the
5618 case of a static data member initialized inside the
5619 class-specifier, there can be an initializer even if DECL
5620 is *not* defined. */
5621 && (!DECL_EXTERNAL (decl) || init))
5623 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5626 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5627 /* Allow libjava/prims.cc define primitive classes. */
5628 if (init != NULL_TREE
5629 || jclass == NULL_TREE
5630 || TREE_CODE (jclass) != TYPE_DECL
5631 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5632 || !same_type_ignoring_top_level_qualifiers_p
5633 (type, TREE_TYPE (TREE_TYPE (jclass))))
5634 error ("Java object %qD not allocated with %<new%>", decl);
5639 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5640 if (init_const_expr_p)
5642 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5643 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5644 TREE_CONSTANT (decl) = 1;
5647 init = check_initializer (decl, init, flags, &cleanup);
5648 /* Thread-local storage cannot be dynamically initialized. */
5649 if (DECL_THREAD_LOCAL_P (decl) && init)
5651 error ("%qD is thread-local and so cannot be dynamically "
5652 "initialized", decl);
5656 /* Check that the initializer for a static data member was a
5657 constant. Although we check in the parser that the
5658 initializer is an integral constant expression, we do not
5659 simplify division-by-zero at the point at which it
5660 occurs. Therefore, in:
5662 struct S { static const int i = 7 / 0; };
5664 we issue an error at this point. It would
5665 probably be better to forbid division by zero in
5666 integral constant expressions. */
5667 if (DECL_EXTERNAL (decl) && init)
5669 error ("%qD cannot be initialized by a non-constant expression"
5670 " when being declared", decl);
5671 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5679 The memory occupied by any object of static storage
5680 duration is zero-initialized at program startup before
5681 any other initialization takes place.
5683 We cannot create an appropriate initializer until after
5684 the type of DECL is finalized. If DECL_INITIAL is set,
5685 then the DECL is statically initialized, and any
5686 necessary zero-initialization has already been performed. */
5687 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5688 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5689 /*nelts=*/NULL_TREE,
5690 /*static_storage_p=*/true);
5691 /* Remember that the initialization for this variable has
5693 DECL_INITIALIZED_P (decl) = 1;
5694 /* This declaration is the definition of this variable,
5695 unless we are initializing a static data member within
5696 the class specifier. */
5697 if (!DECL_EXTERNAL (decl))
5698 var_definition_p = true;
5700 /* If the variable has an array type, lay out the type, even if
5701 there is no initializer. It is valid to index through the
5702 array, and we must get TYPE_ALIGN set correctly on the array
5704 else if (TREE_CODE (type) == ARRAY_TYPE)
5707 else if (TREE_CODE (decl) == FIELD_DECL
5708 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5709 error ("non-static data member %qD has Java class type", decl);
5711 /* Add this declaration to the statement-tree. This needs to happen
5712 after the call to check_initializer so that the DECL_EXPR for a
5713 reference temp is added before the DECL_EXPR for the reference itself. */
5714 if (at_function_scope_p ())
5715 add_decl_expr (decl);
5717 /* Let the middle end know about variables and functions -- but not
5718 static data members in uninstantiated class templates. */
5719 if (!saved_processing_template_decl
5720 && (TREE_CODE (decl) == VAR_DECL
5721 || TREE_CODE (decl) == FUNCTION_DECL))
5723 if (TREE_CODE (decl) == VAR_DECL)
5725 layout_var_decl (decl);
5726 maybe_commonize_var (decl);
5729 /* This needs to happen after the linkage is set. */
5730 determine_visibility (decl);
5732 if (var_definition_p && TREE_STATIC (decl))
5734 /* If a TREE_READONLY variable needs initialization
5735 at runtime, it is no longer readonly and we need to
5736 avoid MEM_READONLY_P being set on RTL created for it. */
5739 if (TREE_READONLY (decl))
5740 TREE_READONLY (decl) = 0;
5743 else if (was_readonly)
5744 TREE_READONLY (decl) = 1;
5747 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5749 /* Check for abstractness of the type. Notice that there is no
5750 need to strip array types here since the check for those types
5751 is already done within create_array_type_for_decl. */
5752 if (TREE_CODE (type) == FUNCTION_TYPE
5753 || TREE_CODE (type) == METHOD_TYPE)
5754 abstract_virtuals_error (decl, TREE_TYPE (type));
5756 abstract_virtuals_error (decl, type);
5758 if (TREE_TYPE (decl) == error_mark_node)
5759 /* No initialization required. */
5761 else if (TREE_CODE (decl) == FUNCTION_DECL)
5765 if (init == ridpointers[(int)RID_DELETE])
5767 /* fixme check this is 1st decl */
5768 DECL_DELETED_FN (decl) = 1;
5769 DECL_DECLARED_INLINE_P (decl) = 1;
5770 DECL_INITIAL (decl) = error_mark_node;
5772 else if (init == ridpointers[(int)RID_DEFAULT])
5774 if (!defaultable_fn_p (decl))
5775 error ("%qD cannot be defaulted", decl);
5778 /* An out-of-class default definition is defined at
5779 the point where it is explicitly defaulted. */
5780 DECL_DEFAULTED_FN (decl) = 1;
5781 if (DECL_INITIAL (decl) == error_mark_node)
5782 synthesize_method (decl);
5786 error ("function %q#D is initialized like a variable", decl);
5788 /* else no initialization required. */
5790 else if (DECL_EXTERNAL (decl)
5791 && ! (DECL_LANG_SPECIFIC (decl)
5792 && DECL_NOT_REALLY_EXTERN (decl)))
5795 DECL_INITIAL (decl) = init;
5797 /* A variable definition. */
5798 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5799 /* Initialize the local variable. */
5800 initialize_local_var (decl, init);
5802 /* If a variable is defined, and then a subsequent
5803 definition with external linkage is encountered, we will
5804 get here twice for the same variable. We want to avoid
5805 calling expand_static_init more than once. For variables
5806 that are not static data members, we can call
5807 expand_static_init only when we actually process the
5808 initializer. It is not legal to redeclare a static data
5809 member, so this issue does not arise in that case. */
5810 else if (var_definition_p && TREE_STATIC (decl))
5811 expand_static_init (decl, init);
5814 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5815 reference, insert it in the statement-tree now. */
5817 push_cleanup (decl, cleanup, false);
5820 processing_template_decl = saved_processing_template_decl;
5823 TREE_READONLY (decl) = 1;
5825 /* If this was marked 'used', be sure it will be output. */
5826 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5827 mark_decl_referenced (decl);
5830 /* This is here for a midend callback from c-common.c. */
5833 finish_decl (tree decl, tree init, tree asmspec_tree)
5835 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5838 /* Returns a declaration for a VAR_DECL as if:
5840 extern "C" TYPE NAME;
5842 had been seen. Used to create compiler-generated global
5846 declare_global_var (tree name, tree type)
5850 push_to_top_level ();
5851 decl = build_decl (VAR_DECL, name, type);
5852 TREE_PUBLIC (decl) = 1;
5853 DECL_EXTERNAL (decl) = 1;
5854 DECL_ARTIFICIAL (decl) = 1;
5855 /* If the user has explicitly declared this variable (perhaps
5856 because the code we are compiling is part of a low-level runtime
5857 library), then it is possible that our declaration will be merged
5858 with theirs by pushdecl. */
5859 decl = pushdecl (decl);
5860 finish_decl (decl, NULL_TREE, NULL_TREE);
5861 pop_from_top_level ();
5866 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5867 if "__cxa_atexit" is not being used) corresponding to the function
5868 to be called when the program exits. */
5871 get_atexit_fn_ptr_type (void)
5876 if (!atexit_fn_ptr_type_node)
5878 if (flag_use_cxa_atexit
5879 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5880 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5881 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5883 /* The parameter to "atexit" is "void (*)(void)". */
5884 arg_types = void_list_node;
5886 fn_type = build_function_type (void_type_node, arg_types);
5887 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5890 return atexit_fn_ptr_type_node;
5893 /* Returns a pointer to the `atexit' function. Note that if
5894 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5895 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5898 get_atexit_node (void)
5905 bool use_aeabi_atexit;
5910 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5912 /* The declaration for `__cxa_atexit' is:
5914 int __cxa_atexit (void (*)(void *), void *, void *)
5916 We build up the argument types and then then function type
5919 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5920 /* First, build the pointer-to-function type for the first
5922 fn_ptr_type = get_atexit_fn_ptr_type ();
5923 /* Then, build the rest of the argument types. */
5924 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5925 if (use_aeabi_atexit)
5927 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5928 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5932 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5933 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5935 /* And the final __cxa_atexit type. */
5936 fn_type = build_function_type (integer_type_node, arg_types);
5937 fn_ptr_type = build_pointer_type (fn_type);
5938 if (use_aeabi_atexit)
5939 name = "__aeabi_atexit";
5941 name = "__cxa_atexit";
5945 /* The declaration for `atexit' is:
5947 int atexit (void (*)());
5949 We build up the argument types and then then function type
5951 fn_ptr_type = get_atexit_fn_ptr_type ();
5952 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5953 /* Build the final atexit type. */
5954 fn_type = build_function_type (integer_type_node, arg_types);
5958 /* Now, build the function declaration. */
5959 push_lang_context (lang_name_c);
5960 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5961 mark_used (atexit_fndecl);
5962 pop_lang_context ();
5963 atexit_node = decay_conversion (atexit_fndecl);
5968 /* Returns the __dso_handle VAR_DECL. */
5971 get_dso_handle_node (void)
5973 if (dso_handle_node)
5974 return dso_handle_node;
5976 /* Declare the variable. */
5977 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5980 return dso_handle_node;
5983 /* Begin a new function with internal linkage whose job will be simply
5984 to destroy some particular variable. */
5986 static GTY(()) int start_cleanup_cnt;
5989 start_cleanup_fn (void)
5994 bool use_cxa_atexit = flag_use_cxa_atexit
5995 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5997 push_to_top_level ();
5999 /* No need to mangle this. */
6000 push_lang_context (lang_name_c);
6002 /* Build the name of the function. */
6003 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6004 /* Build the function declaration. */
6005 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6006 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6007 /* It's a function with internal linkage, generated by the
6009 TREE_PUBLIC (fndecl) = 0;
6010 DECL_ARTIFICIAL (fndecl) = 1;
6011 /* Make the function `inline' so that it is only emitted if it is
6012 actually needed. It is unlikely that it will be inlined, since
6013 it is only called via a function pointer, but we avoid unnecessary
6014 emissions this way. */
6015 DECL_INTERFACE_KNOWN (fndecl) = 1;
6016 /* Build the parameter. */
6021 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6022 DECL_CONTEXT (parmdecl) = fndecl;
6023 TREE_USED (parmdecl) = 1;
6024 DECL_ARGUMENTS (fndecl) = parmdecl;
6028 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6030 pop_lang_context ();
6032 return current_function_decl;
6035 /* Finish the cleanup function begun by start_cleanup_fn. */
6038 end_cleanup_fn (void)
6040 expand_or_defer_fn (finish_function (0));
6042 pop_from_top_level ();
6045 /* Generate code to handle the destruction of DECL, an object with
6046 static storage duration. */
6049 register_dtor_fn (tree decl)
6058 type = TREE_TYPE (decl);
6059 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6060 return void_zero_node;
6062 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6063 a class object, we can just pass the destructor to
6064 "__cxa_atexit"; we don't have to build a temporary function to do
6066 use_dtor = (flag_use_cxa_atexit
6067 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6068 && CLASS_TYPE_P (type));
6073 /* Find the destructor. */
6074 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6075 gcc_assert (idx >= 0);
6076 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6077 /* Make sure it is accessible. */
6078 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6082 /* Call build_cleanup before we enter the anonymous function so
6083 that any access checks will be done relative to the current
6084 scope, rather than the scope of the anonymous function. */
6085 build_cleanup (decl);
6087 /* Now start the function. */
6088 cleanup = start_cleanup_fn ();
6090 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6091 to the original function, rather than the anonymous one. That
6092 will make the back end think that nested functions are in use,
6093 which causes confusion. */
6094 push_deferring_access_checks (dk_no_check);
6095 fcall = build_cleanup (decl);
6096 pop_deferring_access_checks ();
6098 /* Create the body of the anonymous function. */
6099 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6100 finish_expr_stmt (fcall);
6101 finish_compound_stmt (compound_stmt);
6105 /* Call atexit with the cleanup function. */
6106 mark_used (cleanup);
6107 cleanup = build_address (cleanup);
6108 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6114 /* We must convert CLEANUP to the type that "__cxa_atexit"
6116 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6117 /* "__cxa_atexit" will pass the address of DECL to the
6118 cleanup function. */
6120 addr = build_address (decl);
6121 /* The declared type of the parameter to "__cxa_atexit" is
6122 "void *". For plain "T*", we could just let the
6123 machinery in cp_build_function_call convert it -- but if the
6124 type is "cv-qualified T *", then we need to convert it
6125 before passing it in, to avoid spurious errors. */
6126 addr = build_nop (ptr_type_node, addr);
6129 /* Since the cleanup functions we build ignore the address
6130 they're given, there's no reason to pass the actual address
6131 in, and, in general, it's cheaper to pass NULL than any
6133 addr = null_pointer_node;
6134 args = tree_cons (NULL_TREE,
6135 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6136 tf_warning_or_error),
6138 if (targetm.cxx.use_aeabi_atexit ())
6140 args = tree_cons (NULL_TREE, cleanup, args);
6141 args = tree_cons (NULL_TREE, addr, args);
6145 args = tree_cons (NULL_TREE, addr, args);
6146 args = tree_cons (NULL_TREE, cleanup, args);
6150 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6151 return cp_build_function_call (get_atexit_node (), args,
6152 tf_warning_or_error);
6155 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6156 is its initializer. Generate code to handle the construction
6157 and destruction of DECL. */
6160 expand_static_init (tree decl, tree init)
6162 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6163 gcc_assert (TREE_STATIC (decl));
6165 /* Some variables require no initialization. */
6167 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6168 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6171 if (DECL_FUNCTION_SCOPE_P (decl))
6173 /* Emit code to perform this initialization but once. */
6174 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6175 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6176 tree guard, guard_addr;
6177 tree acquire_fn, release_fn, abort_fn;
6180 /* Emit code to perform this initialization but once. This code
6183 static <type> guard;
6184 if (!guard.first_byte) {
6185 if (__cxa_guard_acquire (&guard)) {
6188 // Do initialization.
6189 flag = true; __cxa_guard_release (&guard);
6190 // Register variable for destruction at end of program.
6192 if (!flag) __cxa_guard_abort (&guard);
6196 Note that the `flag' variable is only set to 1 *after* the
6197 initialization is complete. This ensures that an exception,
6198 thrown during the construction, will cause the variable to
6199 reinitialized when we pass through this code again, as per:
6203 If the initialization exits by throwing an exception, the
6204 initialization is not complete, so it will be tried again
6205 the next time control enters the declaration.
6207 This process should be thread-safe, too; multiple threads
6208 should not be able to initialize the variable more than
6211 /* Create the guard variable. */
6212 guard = get_guard (decl);
6214 /* This optimization isn't safe on targets with relaxed memory
6215 consistency. On such targets we force synchronization in
6216 __cxa_guard_acquire. */
6217 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6219 /* Begin the conditional initialization. */
6220 if_stmt = begin_if_stmt ();
6221 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6222 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6225 if (flag_threadsafe_statics)
6227 guard_addr = build_address (guard);
6229 acquire_fn = get_identifier ("__cxa_guard_acquire");
6230 release_fn = get_identifier ("__cxa_guard_release");
6231 abort_fn = get_identifier ("__cxa_guard_abort");
6232 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6234 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6236 tree vfntype = build_function_type (void_type_node, argtypes);
6237 acquire_fn = push_library_fn
6238 (acquire_fn, build_function_type (integer_type_node, argtypes),
6240 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6241 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6245 release_fn = identifier_global_value (release_fn);
6246 abort_fn = identifier_global_value (abort_fn);
6249 inner_if_stmt = begin_if_stmt ();
6250 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6253 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6254 begin = get_target_expr (boolean_false_node);
6255 flag = TARGET_EXPR_SLOT (begin);
6257 TARGET_EXPR_CLEANUP (begin)
6258 = build3 (COND_EXPR, void_type_node, flag,
6260 build_call_n (abort_fn, 1, guard_addr));
6261 CLEANUP_EH_ONLY (begin) = 1;
6263 /* Do the initialization itself. */
6264 init = add_stmt_to_compound (begin, init);
6265 init = add_stmt_to_compound
6266 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6267 init = add_stmt_to_compound
6268 (init, build_call_n (release_fn, 1, guard_addr));
6271 init = add_stmt_to_compound (init, set_guard (guard));
6273 /* Use atexit to register a function for destroying this static
6275 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6277 finish_expr_stmt (init);
6279 if (flag_threadsafe_statics)
6281 finish_compound_stmt (inner_then_clause);
6282 finish_then_clause (inner_if_stmt);
6283 finish_if_stmt (inner_if_stmt);
6286 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6288 finish_compound_stmt (then_clause);
6289 finish_then_clause (if_stmt);
6290 finish_if_stmt (if_stmt);
6294 static_aggregates = tree_cons (init, decl, static_aggregates);
6298 /* Make TYPE a complete type based on INITIAL_VALUE.
6299 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6300 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6301 3 if the initializer list is empty (in pedantic mode). */
6304 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6307 tree type, elt_type;
6311 unsigned HOST_WIDE_INT i;
6314 /* An array of character type can be initialized from a
6315 brace-enclosed string constant.
6317 FIXME: this code is duplicated from reshape_init. Probably
6318 we should just call reshape_init here? */
6319 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6320 && TREE_CODE (initial_value) == CONSTRUCTOR
6321 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6323 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6324 tree value = VEC_index (constructor_elt, v, 0)->value;
6326 if (TREE_CODE (value) == STRING_CST
6327 && VEC_length (constructor_elt, v) == 1)
6328 initial_value = value;
6331 /* If any of the elements are parameter packs, we can't actually
6332 complete this type now because the array size is dependent. */
6333 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6335 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6338 if (PACK_EXPANSION_P (value))
6344 failure = complete_array_type (ptype, initial_value, do_default);
6346 /* We can create the array before the element type is complete, which
6347 means that we didn't have these two bits set in the original type
6348 either. In completing the type, we are expected to propagate these
6349 bits. See also complete_type which does the same thing for arrays
6352 if (TYPE_DOMAIN (type))
6354 elt_type = TREE_TYPE (type);
6355 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6356 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6357 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6363 /* Return zero if something is declared to be a member of type
6364 CTYPE when in the context of CUR_TYPE. STRING is the error
6365 message to print in that case. Otherwise, quietly return 1. */
6368 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6370 if (ctype && ctype != cur_type)
6372 if (flags == DTOR_FLAG)
6373 error ("destructor for alien class %qT cannot be a member", ctype);
6375 error ("constructor for alien class %qT cannot be a member", ctype);
6381 /* Subroutine of `grokdeclarator'. */
6383 /* Generate errors possibly applicable for a given set of specifiers.
6384 This is for ARM $7.1.2. */
6387 bad_specifiers (tree object,
6396 error ("%qD declared as a %<virtual%> %s", object, type);
6398 error ("%qD declared as an %<inline%> %s", object, type);
6400 error ("%<const%> and %<volatile%> function specifiers on "
6401 "%qD invalid in %s declaration",
6404 error ("%q+D declared as a friend", object);
6406 && (TREE_CODE (object) == TYPE_DECL
6407 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6408 && !TYPE_REFFN_P (TREE_TYPE (object))
6409 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6410 error ("%q+D declared with an exception specification", object);
6413 /* DECL is a member function or static data member and is presently
6414 being defined. Check that the definition is taking place in a
6418 check_class_member_definition_namespace (tree decl)
6420 /* These checks only apply to member functions and static data
6422 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6423 || TREE_CODE (decl) == VAR_DECL);
6424 /* We check for problems with specializations in pt.c in
6425 check_specialization_namespace, where we can issue better
6427 if (processing_specialization)
6429 /* There are no restrictions on the placement of
6430 explicit instantiations. */
6431 if (processing_explicit_instantiation)
6435 A member function definition that appears outside of the
6436 class definition shall appear in a namespace scope enclosing
6437 the class definition.
6441 The definition for a static data member shall appear in a
6442 namespace scope enclosing the member's class definition. */
6443 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6444 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6445 decl, DECL_CONTEXT (decl));
6448 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6449 METHOD_TYPE for a non-static member function; QUALS are the
6450 cv-qualifiers that apply to the function. */
6453 build_this_parm (tree type, cp_cv_quals quals)
6458 cp_cv_quals this_quals;
6460 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6461 /* The `this' parameter is implicitly `const'; it cannot be
6463 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6464 qual_type = cp_build_qualified_type (this_type, this_quals);
6465 parm = build_artificial_parm (this_identifier, qual_type);
6466 cp_apply_type_quals_to_decl (this_quals, parm);
6470 /* CTYPE is class type, or null if non-class.
6471 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6473 DECLARATOR is the function's name.
6474 PARMS is a chain of PARM_DECLs for the function.
6475 VIRTUALP is truthvalue of whether the function is virtual or not.
6476 FLAGS are to be passed through to `grokclassfn'.
6477 QUALS are qualifiers indicating whether the function is `const'
6479 RAISES is a list of exceptions that this function can raise.
6480 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6481 not look, and -1 if we should not call `grokclassfn' at all.
6483 SFK is the kind of special function (if any) for the new function.
6485 Returns `NULL_TREE' if something goes wrong, after issuing
6486 applicable error messages. */
6489 grokfndecl (tree ctype,
6493 tree orig_declarator,
6495 enum overload_flags flags,
6502 special_function_kind sfk,
6509 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6513 type = build_exception_variant (type, raises);
6515 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6516 if (TREE_CODE (type) == METHOD_TYPE)
6519 parm = build_this_parm (type, quals);
6520 TREE_CHAIN (parm) = parms;
6523 DECL_ARGUMENTS (decl) = parms;
6524 /* Propagate volatile out from type to decl. */
6525 if (TYPE_VOLATILE (type))
6526 TREE_THIS_VOLATILE (decl) = 1;
6528 /* Setup decl according to sfk. */
6531 case sfk_constructor:
6532 case sfk_copy_constructor:
6533 DECL_CONSTRUCTOR_P (decl) = 1;
6535 case sfk_destructor:
6536 DECL_DESTRUCTOR_P (decl) = 1;
6542 /* If pointers to member functions use the least significant bit to
6543 indicate whether a function is virtual, ensure a pointer
6544 to this function will have that bit clear. */
6545 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6546 && TREE_CODE (type) == METHOD_TYPE
6547 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6548 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6551 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6555 ("defining explicit specialization %qD in friend declaration",
6559 tree fns = TREE_OPERAND (orig_declarator, 0);
6560 tree args = TREE_OPERAND (orig_declarator, 1);
6562 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6564 /* Something like `template <class T> friend void f<T>()'. */
6565 error ("invalid use of template-id %qD in declaration "
6566 "of primary template",
6572 /* A friend declaration of the form friend void f<>(). Record
6573 the information in the TEMPLATE_ID_EXPR. */
6574 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6576 if (TREE_CODE (fns) == COMPONENT_REF)
6578 /* Due to bison parser ickiness, we will have already looked
6579 up an operator_name or PFUNCNAME within the current class
6580 (see template_id in parse.y). If the current class contains
6581 such a name, we'll get a COMPONENT_REF here. Undo that. */
6583 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6584 == current_class_type);
6585 fns = TREE_OPERAND (fns, 1);
6587 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6588 || TREE_CODE (fns) == OVERLOAD);
6589 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6591 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6592 if (TREE_PURPOSE (t)
6593 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6595 error ("default arguments are not allowed in declaration "
6596 "of friend template specialization %qD",
6603 error ("%<inline%> is not allowed in declaration of friend "
6604 "template specialization %qD",
6611 /* If this decl has namespace scope, set that up. */
6613 set_decl_namespace (decl, in_namespace, friendp);
6615 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6617 /* `main' and builtins have implicit 'C' linkage. */
6618 if ((MAIN_NAME_P (declarator)
6619 || (IDENTIFIER_LENGTH (declarator) > 10
6620 && IDENTIFIER_POINTER (declarator)[0] == '_'
6621 && IDENTIFIER_POINTER (declarator)[1] == '_'
6622 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6623 && current_lang_name == lang_name_cplusplus
6624 && ctype == NULL_TREE
6625 /* NULL_TREE means global namespace. */
6626 && DECL_CONTEXT (decl) == NULL_TREE)
6627 SET_DECL_LANGUAGE (decl, lang_c);
6629 /* Should probably propagate const out from type to decl I bet (mrs). */
6632 DECL_STATIC_FUNCTION_P (decl) = 1;
6633 DECL_CONTEXT (decl) = ctype;
6638 DECL_CONTEXT (decl) = ctype;
6640 check_class_member_definition_namespace (decl);
6643 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6645 if (processing_template_decl)
6646 error ("cannot declare %<::main%> to be a template");
6648 error ("cannot declare %<::main%> to be inline");
6650 error ("cannot declare %<::main%> to be static");
6655 /* Members of anonymous types and local classes have no linkage; make
6656 them internal. If a typedef is made later, this will be changed. */
6657 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6658 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6663 /* [basic.link]: A name with no linkage (notably, the name of a class
6664 or enumeration declared in a local scope) shall not be used to
6665 declare an entity with linkage.
6667 Only check this for public decls for now. See core 319, 389. */
6668 t = no_linkage_check (TREE_TYPE (decl),
6669 /*relaxed_p=*/false);
6672 if (TYPE_ANONYMOUS_P (t))
6674 if (DECL_EXTERN_C_P (decl))
6675 /* Allow this; it's pretty common in C. */;
6678 permerror (input_location, "non-local function %q#D uses anonymous type",
6680 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6681 permerror (input_location, "%q+#D does not refer to the unqualified "
6682 "type, so it is not used for linkage",
6687 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6691 TREE_PUBLIC (decl) = publicp;
6694 DECL_INTERFACE_KNOWN (decl) = 1;
6695 DECL_NOT_REALLY_EXTERN (decl) = 1;
6698 /* If the declaration was declared inline, mark it as such. */
6700 DECL_DECLARED_INLINE_P (decl) = 1;
6702 DECL_EXTERNAL (decl) = 1;
6703 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6706 ? G_("static member function %qD cannot have cv-qualifier")
6707 : G_("non-member function %qD cannot have cv-qualifier"),
6709 quals = TYPE_UNQUALIFIED;
6712 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6713 && !grok_op_properties (decl, /*complain=*/true))
6716 if (ctype && decl_function_context (decl))
6717 DECL_NO_STATIC_CHAIN (decl) = 1;
6720 /* Make the init_value nonzero so pushdecl knows this is not
6721 tentative. error_mark_node is replaced later with the BLOCK. */
6722 DECL_INITIAL (decl) = error_mark_node;
6724 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6725 TREE_NOTHROW (decl) = 1;
6727 /* Caller will do the rest of this. */
6731 if (ctype != NULL_TREE)
6732 grokclassfn (ctype, decl, flags);
6734 decl = check_explicit_specialization (orig_declarator, decl,
6737 4 * (friendp != 0));
6738 if (decl == error_mark_node)
6743 cplus_decl_attributes (&decl, *attrlist, 0);
6744 *attrlist = NULL_TREE;
6747 /* Check main's type after attributes have been applied. */
6748 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6750 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6753 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6755 error ("%<::main%> must return %<int%>");
6756 newtype = build_function_type (integer_type_node, oldtypeargs);
6757 TREE_TYPE (decl) = newtype;
6760 check_main_parameter_types (decl);
6763 if (ctype != NULL_TREE
6764 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6767 tree old_decl = check_classfn (ctype, decl,
6768 (processing_template_decl
6769 > template_class_depth (ctype))
6770 ? current_template_parms
6773 if (old_decl == error_mark_node)
6781 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6782 /* Because grokfndecl is always supposed to return a
6783 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6784 here. We depend on our callers to figure out that its
6785 really a template that's being returned. */
6786 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6788 if (DECL_STATIC_FUNCTION_P (old_decl)
6789 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6790 /* Remove the `this' parm added by grokclassfn.
6791 XXX Isn't this done in start_function, too? */
6792 revert_static_member_fn (decl);
6793 if (DECL_ARTIFICIAL (old_decl))
6795 error ("definition of implicitly-declared %qD", old_decl);
6799 /* Since we've smashed OLD_DECL to its
6800 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6801 if (TREE_CODE (decl) == TEMPLATE_DECL)
6802 decl = DECL_TEMPLATE_RESULT (decl);
6804 /* Attempt to merge the declarations. This can fail, in
6805 the case of some invalid specialization declarations. */
6806 pushed_scope = push_scope (ctype);
6807 ok = duplicate_decls (decl, old_decl, friendp);
6809 pop_scope (pushed_scope);
6812 error ("no %q#D member function declared in class %qT",
6820 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6823 if (ctype == NULL_TREE || check)
6827 DECL_VIRTUAL_P (decl) = 1;
6832 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6833 the linkage that DECL will receive in the object file. */
6836 set_linkage_for_static_data_member (tree decl)
6838 /* A static data member always has static storage duration and
6839 external linkage. Note that static data members are forbidden in
6840 local classes -- the only situation in which a class has
6841 non-external linkage. */
6842 TREE_PUBLIC (decl) = 1;
6843 TREE_STATIC (decl) = 1;
6844 /* For non-template classes, static data members are always put
6845 out in exactly those files where they are defined, just as
6846 with ordinary namespace-scope variables. */
6847 if (!processing_template_decl)
6848 DECL_INTERFACE_KNOWN (decl) = 1;
6851 /* Create a VAR_DECL named NAME with the indicated TYPE.
6853 If SCOPE is non-NULL, it is the class type or namespace containing
6854 the variable. If SCOPE is NULL, the variable should is created in
6855 the innermost enclosings scope. */
6858 grokvardecl (tree type,
6860 const cp_decl_specifier_seq *declspecs,
6866 tree explicit_scope;
6868 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6870 /* Compute the scope in which to place the variable, but remember
6871 whether or not that scope was explicitly specified by the user. */
6872 explicit_scope = scope;
6875 /* An explicit "extern" specifier indicates a namespace-scope
6877 if (declspecs->storage_class == sc_extern)
6878 scope = current_namespace;
6879 else if (!at_function_scope_p ())
6880 scope = current_scope ();
6884 && (/* If the variable is a namespace-scope variable declared in a
6885 template, we need DECL_LANG_SPECIFIC. */
6886 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6887 /* Similarly for namespace-scope variables with language linkage
6889 || (TREE_CODE (scope) == NAMESPACE_DECL
6890 && current_lang_name != lang_name_cplusplus)
6891 /* Similarly for static data members. */
6893 decl = build_lang_decl (VAR_DECL, name, type);
6895 decl = build_decl (VAR_DECL, name, type);
6897 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6898 set_decl_namespace (decl, explicit_scope, 0);
6900 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6902 if (declspecs->storage_class == sc_extern)
6904 DECL_THIS_EXTERN (decl) = 1;
6905 DECL_EXTERNAL (decl) = !initialized;
6908 if (DECL_CLASS_SCOPE_P (decl))
6910 set_linkage_for_static_data_member (decl);
6911 /* This function is only called with out-of-class definitions. */
6912 DECL_EXTERNAL (decl) = 0;
6913 check_class_member_definition_namespace (decl);
6915 /* At top level, either `static' or no s.c. makes a definition
6916 (perhaps tentative), and absence of `static' makes it public. */
6917 else if (toplevel_bindings_p ())
6919 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6920 && (DECL_THIS_EXTERN (decl) || ! constp));
6921 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6923 /* Not at top level, only `static' makes a static definition. */
6926 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6927 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6930 if (declspecs->specs[(int)ds_thread])
6931 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6933 if (TREE_PUBLIC (decl))
6935 /* [basic.link]: A name with no linkage (notably, the name of a class
6936 or enumeration declared in a local scope) shall not be used to
6937 declare an entity with linkage.
6939 Only check this for public decls for now. */
6940 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6943 if (TYPE_ANONYMOUS_P (t))
6945 if (DECL_EXTERN_C_P (decl))
6946 /* Allow this; it's pretty common in C. */
6950 /* DRs 132, 319 and 389 seem to indicate types with
6951 no linkage can only be used to declare extern "C"
6952 entities. Since it's not always an error in the
6953 ISO C++ 90 Standard, we only issue a warning. */
6954 warning (0, "non-local variable %q#D uses anonymous type",
6956 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6957 warning (0, "%q+#D does not refer to the unqualified "
6958 "type, so it is not used for linkage",
6963 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6967 DECL_INTERFACE_KNOWN (decl) = 1;
6972 /* Create and return a canonical pointer to member function type, for
6973 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6976 build_ptrmemfunc_type (tree type)
6980 tree unqualified_variant = NULL_TREE;
6982 if (type == error_mark_node)
6985 /* If a canonical type already exists for this type, use it. We use
6986 this method instead of type_hash_canon, because it only does a
6987 simple equality check on the list of field members. */
6989 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6992 /* Make sure that we always have the unqualified pointer-to-member
6994 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6996 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6998 t = make_class_type (RECORD_TYPE);
6999 xref_basetypes (t, NULL_TREE);
7001 /* Let the front end know this is a pointer to member function... */
7002 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7003 /* ... and not really a class type. */
7004 SET_CLASS_TYPE_P (t, 0);
7006 field = build_decl (FIELD_DECL, pfn_identifier, type);
7009 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
7010 TREE_CHAIN (field) = fields;
7013 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7015 /* Zap out the name so that the back end will give us the debugging
7016 information for this anonymous RECORD_TYPE. */
7017 TYPE_NAME (t) = NULL_TREE;
7019 /* If this is not the unqualified form of this pointer-to-member
7020 type, set the TYPE_MAIN_VARIANT for this type to be the
7021 unqualified type. Since they are actually RECORD_TYPEs that are
7022 not variants of each other, we must do this manually. */
7023 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7025 t = build_qualified_type (t, cp_type_quals (type));
7026 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7027 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7028 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7029 TREE_TYPE (TYPE_BINFO (t)) = t;
7032 /* Cache this pointer-to-member type so that we can find it again
7034 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7036 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7037 SET_TYPE_STRUCTURAL_EQUALITY (t);
7038 else if (TYPE_CANONICAL (type) != type)
7039 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7044 /* Create and return a pointer to data member type. */
7047 build_ptrmem_type (tree class_type, tree member_type)
7049 if (TREE_CODE (member_type) == METHOD_TYPE)
7053 arg_types = TYPE_ARG_TYPES (member_type);
7054 class_type = (cp_build_qualified_type
7056 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7058 = build_method_type_directly (class_type,
7059 TREE_TYPE (member_type),
7060 TREE_CHAIN (arg_types));
7061 return build_ptrmemfunc_type (build_pointer_type (member_type));
7065 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7066 return build_offset_type (class_type, member_type);
7070 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7071 Check to see that the definition is valid. Issue appropriate error
7072 messages. Return 1 if the definition is particularly bad, or 0
7076 check_static_variable_definition (tree decl, tree type)
7078 /* Motion 10 at San Diego: If a static const integral data member is
7079 initialized with an integral constant expression, the initializer
7080 may appear either in the declaration (within the class), or in
7081 the definition, but not both. If it appears in the class, the
7082 member is a member constant. The file-scope definition is always
7084 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7086 error ("invalid in-class initialization of static data member "
7087 "of non-integral type %qT",
7089 /* If we just return the declaration, crashes will sometimes
7090 occur. We therefore return void_type_node, as if this were a
7091 friend declaration, to cause callers to completely ignore
7092 this declaration. */
7095 else if (!CP_TYPE_CONST_P (type))
7096 error ("ISO C++ forbids in-class initialization of non-const "
7097 "static member %qD",
7099 else if (!INTEGRAL_TYPE_P (type))
7100 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7101 "%qD of non-integral type %qT", decl, type);
7106 /* Given the SIZE (i.e., number of elements) in an array, compute an
7107 appropriate index type for the array. If non-NULL, NAME is the
7108 name of the thing being declared. */
7111 compute_array_index_type (tree name, tree size)
7115 tree abi_1_itype = NULL_TREE;
7117 if (error_operand_p (size))
7118 return error_mark_node;
7120 type = TREE_TYPE (size);
7121 /* The array bound must be an integer type. */
7122 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7125 error ("size of array %qD has non-integral type %qT", name, type);
7127 error ("size of array has non-integral type %qT", type);
7128 size = integer_one_node;
7129 type = TREE_TYPE (size);
7132 if (value_dependent_expression_p (size))
7134 /* We cannot do any checking for a value-dependent SIZE. Just
7135 build the index type and mark that it requires structural
7137 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7138 size, integer_one_node));
7139 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7143 if (!abi_version_at_least (2) && processing_template_decl)
7144 /* For abi-1, we handled all instances in templates the same way,
7145 even when they were non-dependent. This affects the manglings
7146 produced. So, we do the normal checking for non-dependent
7147 sizes, but at the end we'll return the same type that abi-1
7148 would have, but with TYPE_CANONICAL set to the "right"
7149 value that the current ABI would provide. */
7150 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7151 size, integer_one_node));
7153 /* The size might be the result of a cast. */
7154 STRIP_TYPE_NOPS (size);
7156 /* It might be a const variable or enumeration constant. */
7157 size = integral_constant_value (size);
7159 /* Normally, the array-bound will be a constant. */
7160 if (TREE_CODE (size) == INTEGER_CST)
7162 /* Check to see if the array bound overflowed. Make that an
7163 error, no matter how generous we're being. */
7164 constant_expression_error (size);
7166 /* An array must have a positive number of elements. */
7167 if (INT_CST_LT (size, integer_zero_node))
7170 error ("size of array %qD is negative", name);
7172 error ("size of array is negative");
7173 size = integer_one_node;
7175 /* As an extension we allow zero-sized arrays. We always allow
7176 them in system headers because glibc uses them. */
7177 else if (integer_zerop (size) && !in_system_header)
7180 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7182 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7185 else if (TREE_CONSTANT (size))
7187 /* `(int) &fn' is not a valid array bound. */
7189 error ("size of array %qD is not an integral constant-expression",
7192 error ("size of array is not an integral constant-expression");
7193 size = integer_one_node;
7195 else if (pedantic && warn_vla != 0)
7198 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7200 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7202 else if (warn_vla > 0)
7206 "variable length array %qD is used", name);
7209 "variable length array is used");
7212 if (processing_template_decl && !TREE_CONSTANT (size))
7213 /* A variable sized array. */
7214 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7217 HOST_WIDE_INT saved_processing_template_decl;
7219 /* Compute the index of the largest element in the array. It is
7220 one less than the number of elements in the array. We save
7221 and restore PROCESSING_TEMPLATE_DECL so that computations in
7222 cp_build_binary_op will be appropriately folded. */
7223 saved_processing_template_decl = processing_template_decl;
7224 processing_template_decl = 0;
7225 itype = cp_build_binary_op (MINUS_EXPR,
7226 cp_convert (ssizetype, size),
7227 cp_convert (ssizetype, integer_one_node),
7228 tf_warning_or_error);
7229 itype = fold (itype);
7230 processing_template_decl = saved_processing_template_decl;
7232 if (!TREE_CONSTANT (itype))
7233 /* A variable sized array. */
7234 itype = variable_size (itype);
7235 /* Make sure that there was no overflow when creating to a signed
7236 index type. (For example, on a 32-bit machine, an array with
7237 size 2^32 - 1 is too big.) */
7238 else if (TREE_CODE (itype) == INTEGER_CST
7239 && TREE_OVERFLOW (itype))
7241 error ("overflow in array dimension");
7242 TREE_OVERFLOW (itype) = 0;
7246 /* Create and return the appropriate index type. */
7249 tree t = build_index_type (itype);
7250 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7254 return build_index_type (itype);
7257 /* Returns the scope (if any) in which the entity declared by
7258 DECLARATOR will be located. If the entity was declared with an
7259 unqualified name, NULL_TREE is returned. */
7262 get_scope_of_declarator (const cp_declarator *declarator)
7264 while (declarator && declarator->kind != cdk_id)
7265 declarator = declarator->declarator;
7267 /* If the declarator-id is a SCOPE_REF, the scope in which the
7268 declaration occurs is the first operand. */
7270 && declarator->u.id.qualifying_scope)
7271 return declarator->u.id.qualifying_scope;
7273 /* Otherwise, the declarator is not a qualified name; the entity will
7274 be declared in the current scope. */
7278 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7279 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7283 create_array_type_for_decl (tree name, tree type, tree size)
7285 tree itype = NULL_TREE;
7286 const char* error_msg;
7288 /* If things have already gone awry, bail now. */
7289 if (type == error_mark_node || size == error_mark_node)
7290 return error_mark_node;
7292 /* Assume that everything will go OK. */
7295 /* There are some types which cannot be array elements. */
7296 switch (TREE_CODE (type))
7299 error_msg = "array of void";
7303 error_msg = "array of functions";
7306 case REFERENCE_TYPE:
7307 error_msg = "array of references";
7311 error_msg = "array of function members";
7318 /* If something went wrong, issue an error-message and return. */
7322 error ("declaration of %qD as %s", name, error_msg);
7324 error ("creating %s", error_msg);
7326 return error_mark_node;
7331 The constant expressions that specify the bounds of the arrays
7332 can be omitted only for the first member of the sequence. */
7333 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7336 error ("declaration of %qD as multidimensional array must "
7337 "have bounds for all dimensions except the first",
7340 error ("multidimensional array must have bounds for all "
7341 "dimensions except the first");
7343 return error_mark_node;
7346 /* Figure out the index type for the array. */
7348 itype = compute_array_index_type (name, size);
7351 T is called the array element type; this type shall not be [...] an
7352 abstract class type. */
7353 abstract_virtuals_error (name, type);
7355 return build_cplus_array_type (type, itype);
7358 /* Check that it's OK to declare a function with the indicated TYPE.
7359 SFK indicates the kind of special function (if any) that this
7360 function is. OPTYPE is the type given in a conversion operator
7361 declaration, or the class type for a constructor/destructor.
7362 Returns the actual return type of the function; that
7363 may be different than TYPE if an error occurs, or for certain
7364 special functions. */
7367 check_special_function_return_type (special_function_kind sfk,
7373 case sfk_constructor:
7375 error ("return type specification for constructor invalid");
7377 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7378 type = build_pointer_type (optype);
7380 type = void_type_node;
7383 case sfk_destructor:
7385 error ("return type specification for destructor invalid");
7386 /* We can't use the proper return type here because we run into
7387 problems with ambiguous bases and covariant returns.
7388 Java classes are left unchanged because (void *) isn't a valid
7389 Java type, and we don't want to change the Java ABI. */
7390 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7391 type = build_pointer_type (void_type_node);
7393 type = void_type_node;
7396 case sfk_conversion:
7398 error ("return type specified for %<operator %T%>", optype);
7409 /* A variable or data member (whose unqualified name is IDENTIFIER)
7410 has been declared with the indicated TYPE. If the TYPE is not
7411 acceptable, issue an error message and return a type to use for
7412 error-recovery purposes. */
7415 check_var_type (tree identifier, tree type)
7417 if (VOID_TYPE_P (type))
7420 error ("unnamed variable or field declared void");
7421 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7423 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7424 error ("variable or field %qE declared void", identifier);
7427 error ("variable or field declared void");
7428 type = error_mark_node;
7434 /* Given declspecs and a declarator (abstract or otherwise), determine
7435 the name and type of the object declared and construct a DECL node
7438 DECLSPECS points to the representation of declaration-specifier
7439 sequence that precedes declarator.
7441 DECL_CONTEXT says which syntactic context this declaration is in:
7442 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7443 FUNCDEF for a function definition. Like NORMAL but a few different
7444 error messages in each case. Return value may be zero meaning
7445 this definition is too screwy to try to parse.
7446 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7447 handle member functions (which have FIELD context).
7448 Return value may be zero meaning this definition is too screwy to
7450 PARM for a parameter declaration (either within a function prototype
7451 or before a function body). Make a PARM_DECL, or return void_type_node.
7452 CATCHPARM for a parameter declaration before a catch clause.
7453 TYPENAME if for a typename (in a cast or sizeof).
7454 Don't make a DECL node; just return the ..._TYPE node.
7455 FIELD for a struct or union field; make a FIELD_DECL.
7456 BITFIELD for a field with specified width.
7457 INITIALIZED is as for start_decl.
7459 ATTRLIST is a pointer to the list of attributes, which may be NULL
7460 if there are none; *ATTRLIST may be modified if attributes from inside
7461 the declarator should be applied to the declaration.
7463 When this function is called, scoping variables (such as
7464 CURRENT_CLASS_TYPE) should reflect the scope in which the
7465 declaration occurs, not the scope in which the new declaration will
7466 be placed. For example, on:
7470 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7473 Returns a DECL (if a declarator is present), a TYPE (if there is no
7474 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7478 grokdeclarator (const cp_declarator *declarator,
7479 const cp_decl_specifier_seq *declspecs,
7480 enum decl_context decl_context,
7484 tree type = NULL_TREE;
7486 int virtualp, explicitp, friendp, inlinep, staticp;
7487 int explicit_int = 0;
7488 int explicit_char = 0;
7489 int defaulted_int = 0;
7490 tree dependent_name = NULL_TREE;
7492 tree typedef_decl = NULL_TREE;
7493 const char *name = NULL;
7494 tree typedef_type = NULL_TREE;
7495 /* True if this declarator is a function definition. */
7496 bool funcdef_flag = false;
7497 cp_declarator_kind innermost_code = cdk_error;
7500 /* See the code below that used this. */
7501 tree decl_attr = NULL_TREE;
7504 /* Keep track of what sort of function is being processed
7505 so that we can warn about default return values, or explicit
7506 return values which do not match prescribed defaults. */
7507 special_function_kind sfk = sfk_none;
7509 tree dname = NULL_TREE;
7510 tree ctor_return_type = NULL_TREE;
7511 enum overload_flags flags = NO_SPECIAL;
7512 /* cv-qualifiers that apply to the declarator, for a declaration of
7513 a member function. */
7514 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7515 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7517 tree raises = NULL_TREE;
7518 int template_count = 0;
7519 tree returned_attrs = NULL_TREE;
7520 tree parms = NULL_TREE;
7521 const cp_declarator *id_declarator;
7522 /* The unqualified name of the declarator; either an
7523 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7524 tree unqualified_id;
7525 /* The class type, if any, in which this entity is located,
7526 or NULL_TREE if none. Note that this value may be different from
7527 the current class type; for example if an attempt is made to declare
7528 "A::f" inside "B", this value will be "A". */
7529 tree ctype = current_class_type;
7530 /* The NAMESPACE_DECL for the namespace in which this entity is
7531 located. If an unqualified name is used to declare the entity,
7532 this value will be NULL_TREE, even if the entity is located at
7534 tree in_namespace = NULL_TREE;
7535 cp_storage_class storage_class;
7536 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7537 bool type_was_error_mark_node = false;
7538 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7539 bool set_no_warning = false;
7541 signed_p = declspecs->specs[(int)ds_signed];
7542 unsigned_p = declspecs->specs[(int)ds_unsigned];
7543 short_p = declspecs->specs[(int)ds_short];
7544 long_p = declspecs->specs[(int)ds_long];
7545 longlong = declspecs->specs[(int)ds_long] >= 2;
7546 thread_p = declspecs->specs[(int)ds_thread];
7548 if (decl_context == FUNCDEF)
7549 funcdef_flag = true, decl_context = NORMAL;
7550 else if (decl_context == MEMFUNCDEF)
7551 funcdef_flag = true, decl_context = FIELD;
7552 else if (decl_context == BITFIELD)
7553 bitfield = 1, decl_context = FIELD;
7555 if (initialized > 1)
7556 funcdef_flag = true;
7558 /* Look inside a declarator for the name being declared
7559 and get it as a string, for an error message. */
7560 for (id_declarator = declarator;
7562 id_declarator = id_declarator->declarator)
7564 if (id_declarator->kind != cdk_id)
7565 innermost_code = id_declarator->kind;
7567 switch (id_declarator->kind)
7570 if (id_declarator->declarator
7571 && id_declarator->declarator->kind == cdk_id)
7573 sfk = id_declarator->declarator->u.id.sfk;
7574 if (sfk == sfk_destructor)
7581 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7582 tree decl = id_declarator->u.id.unqualified_name;
7585 if (qualifying_scope)
7587 if (at_function_scope_p ())
7591 A declarator-id shall not be qualified except
7594 None of the cases are permitted in block
7596 if (qualifying_scope == global_namespace)
7597 error ("invalid use of qualified-name %<::%D%>",
7599 else if (TYPE_P (qualifying_scope))
7600 error ("invalid use of qualified-name %<%T::%D%>",
7601 qualifying_scope, decl);
7603 error ("invalid use of qualified-name %<%D::%D%>",
7604 qualifying_scope, decl);
7605 return error_mark_node;
7607 else if (TYPE_P (qualifying_scope))
7609 ctype = qualifying_scope;
7610 if (innermost_code != cdk_function
7611 && current_class_type
7612 && !UNIQUELY_DERIVED_FROM_P (ctype,
7613 current_class_type))
7615 error ("type %qT is not derived from type %qT",
7616 ctype, current_class_type);
7617 return error_mark_node;
7620 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7621 in_namespace = qualifying_scope;
7623 switch (TREE_CODE (decl))
7629 if (innermost_code != cdk_function)
7631 error ("declaration of %qD as non-function", decl);
7632 return error_mark_node;
7634 else if (!qualifying_scope
7635 && !(current_class_type && at_class_scope_p ()))
7637 error ("declaration of %qD as non-member", decl);
7638 return error_mark_node;
7641 type = TREE_OPERAND (decl, 0);
7642 name = IDENTIFIER_POINTER (constructor_name (type));
7647 case TEMPLATE_ID_EXPR:
7649 tree fns = TREE_OPERAND (decl, 0);
7652 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7654 gcc_assert (is_overloaded_fn (dname));
7655 dname = DECL_NAME (get_first_fn (dname));
7660 case IDENTIFIER_NODE:
7661 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7664 if (C_IS_RESERVED_WORD (dname))
7666 error ("declarator-id missing; using reserved word %qD",
7668 name = IDENTIFIER_POINTER (dname);
7670 else if (!IDENTIFIER_TYPENAME_P (dname))
7671 name = IDENTIFIER_POINTER (dname);
7674 gcc_assert (flags == NO_SPECIAL);
7675 flags = TYPENAME_FLAG;
7676 ctor_return_type = TREE_TYPE (dname);
7677 sfk = sfk_conversion;
7678 if (is_typename_at_global_scope (dname))
7679 name = IDENTIFIER_POINTER (dname);
7681 name = "<invalid operator>";
7698 return error_mark_node;
7703 if (id_declarator->kind == cdk_id)
7709 The declarator in a function-definition shall have the form
7710 D1 ( parameter-declaration-clause) ... */
7711 if (funcdef_flag && innermost_code != cdk_function)
7713 error ("function definition does not declare parameters");
7714 return error_mark_node;
7717 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7718 && innermost_code != cdk_function
7719 && ! (ctype && !declspecs->any_specifiers_p))
7721 error ("declaration of %qD as non-function", dname);
7722 return error_mark_node;
7725 /* Anything declared one level down from the top level
7726 must be one of the parameters of a function
7727 (because the body is at least two levels down). */
7729 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7730 by not allowing C++ class definitions to specify their parameters
7731 with xdecls (must be spec.d in the parmlist).
7733 Since we now wait to push a class scope until we are sure that
7734 we are in a legitimate method context, we must set oldcname
7735 explicitly (since current_class_name is not yet alive).
7737 We also want to avoid calling this a PARM if it is in a namespace. */
7739 if (decl_context == NORMAL && !toplevel_bindings_p ())
7741 struct cp_binding_level *b = current_binding_level;
7742 current_binding_level = b->level_chain;
7743 if (current_binding_level != 0 && toplevel_bindings_p ())
7744 decl_context = PARM;
7745 current_binding_level = b;
7749 name = decl_context == PARM ? "parameter" : "type name";
7751 /* If there were multiple types specified in the decl-specifier-seq,
7752 issue an error message. */
7753 if (declspecs->multiple_types_p)
7755 error ("two or more data types in declaration of %qs", name);
7756 return error_mark_node;
7759 if (declspecs->conflicting_specifiers_p)
7761 error ("conflicting specifiers in declaration of %qs", name);
7762 return error_mark_node;
7765 /* Extract the basic type from the decl-specifier-seq. */
7766 type = declspecs->type;
7767 if (type == error_mark_node)
7770 type_was_error_mark_node = true;
7772 /* If the entire declaration is itself tagged as deprecated then
7773 suppress reports of deprecated items. */
7774 if (type && TREE_DEPRECATED (type)
7775 && deprecated_state != DEPRECATED_SUPPRESS)
7776 warn_deprecated_use (type);
7777 if (type && TREE_CODE (type) == TYPE_DECL)
7779 typedef_decl = type;
7780 type = TREE_TYPE (typedef_decl);
7781 if (TREE_DEPRECATED (type)
7782 && DECL_ARTIFICIAL (typedef_decl)
7783 && deprecated_state != DEPRECATED_SUPPRESS)
7784 warn_deprecated_use (type);
7786 /* No type at all: default to `int', and set DEFAULTED_INT
7787 because it was not a user-defined typedef. */
7788 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7790 /* These imply 'int'. */
7791 type = integer_type_node;
7795 explicit_int = declspecs->explicit_int_p;
7796 explicit_char = declspecs->explicit_char_p;
7799 /* See the code below that used this. */
7801 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7803 typedef_type = type;
7806 if (sfk != sfk_conversion)
7807 ctor_return_type = ctype;
7809 if (sfk != sfk_none)
7810 type = check_special_function_return_type (sfk, type,
7812 else if (type == NULL_TREE)
7818 /* We handle `main' specially here, because 'main () { }' is so
7819 common. With no options, it is allowed. With -Wreturn-type,
7820 it is a warning. It is only an error with -pedantic-errors. */
7821 is_main = (funcdef_flag
7822 && dname && MAIN_NAME_P (dname)
7823 && ctype == NULL_TREE
7824 && in_namespace == NULL_TREE
7825 && current_namespace == global_namespace);
7827 if (type_was_error_mark_node)
7828 /* We've already issued an error, don't complain more. */;
7829 else if (in_system_header || flag_ms_extensions)
7830 /* Allow it, sigh. */;
7832 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7834 pedwarn (input_location, OPT_pedantic,
7835 "ISO C++ forbids declaration of %qs with no type", name);
7837 warning (OPT_Wreturn_type,
7838 "ISO C++ forbids declaration of %qs with no type", name);
7840 type = integer_type_node;
7845 /* Now process the modifiers that were specified
7846 and check for invalid combinations. */
7848 /* Long double is a special combination. */
7849 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7852 type = build_qualified_type (long_double_type_node,
7853 cp_type_quals (type));
7856 /* Check all other uses of type modifiers. */
7858 if (unsigned_p || signed_p || long_p || short_p)
7862 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7863 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7864 else if (signed_p && unsigned_p)
7865 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7866 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7867 error ("%<long long%> invalid for %qs", name);
7868 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7869 error ("%<long%> invalid for %qs", name);
7870 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7871 error ("%<short%> invalid for %qs", name);
7872 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7873 error ("%<long%> or %<short%> invalid for %qs", name);
7874 else if ((long_p || short_p) && explicit_char)
7875 error ("%<long%> or %<short%> specified with char for %qs", name);
7876 else if (long_p && short_p)
7877 error ("%<long%> and %<short%> specified together for %qs", name);
7878 else if (type == char16_type_node || type == char32_type_node)
7880 if (signed_p || unsigned_p)
7881 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7882 else if (short_p || long_p)
7883 error ("%<short%> or %<long%> invalid for %qs", name);
7888 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7890 pedwarn (input_location, OPT_pedantic,
7891 "long, short, signed or unsigned used invalidly for %qs",
7893 if (flag_pedantic_errors)
7898 /* Discard the type modifiers if they are invalid. */
7909 /* Decide whether an integer type is signed or not.
7910 Optionally treat bitfields as signed by default. */
7914 It is implementation-defined whether a plain (neither
7915 explicitly signed or unsigned) char, short, int, or long
7916 bit-field is signed or unsigned.
7918 Naturally, we extend this to long long as well. Note that
7919 this does not include wchar_t. */
7920 || (bitfield && !flag_signed_bitfields
7922 /* A typedef for plain `int' without `signed' can be
7923 controlled just like plain `int', but a typedef for
7924 `signed int' cannot be so controlled. */
7926 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7927 && TREE_CODE (type) == INTEGER_TYPE
7928 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7931 type = long_long_unsigned_type_node;
7933 type = long_unsigned_type_node;
7935 type = short_unsigned_type_node;
7936 else if (type == char_type_node)
7937 type = unsigned_char_type_node;
7938 else if (typedef_decl)
7939 type = unsigned_type_for (type);
7941 type = unsigned_type_node;
7943 else if (signed_p && type == char_type_node)
7944 type = signed_char_type_node;
7946 type = long_long_integer_type_node;
7948 type = long_integer_type_node;
7950 type = short_integer_type_node;
7952 if (declspecs->specs[(int)ds_complex])
7954 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7955 error ("complex invalid for %qs", name);
7956 /* If we just have "complex", it is equivalent to
7957 "complex double", but if any modifiers at all are specified it is
7958 the complex form of TYPE. E.g, "complex short" is
7959 "complex short int". */
7961 else if (defaulted_int && ! longlong
7962 && ! (long_p || short_p || signed_p || unsigned_p))
7963 type = complex_double_type_node;
7964 else if (type == integer_type_node)
7965 type = complex_integer_type_node;
7966 else if (type == float_type_node)
7967 type = complex_float_type_node;
7968 else if (type == double_type_node)
7969 type = complex_double_type_node;
7970 else if (type == long_double_type_node)
7971 type = complex_long_double_type_node;
7973 type = build_complex_type (type);
7976 type_quals = TYPE_UNQUALIFIED;
7977 if (declspecs->specs[(int)ds_const])
7978 type_quals |= TYPE_QUAL_CONST;
7979 if (declspecs->specs[(int)ds_volatile])
7980 type_quals |= TYPE_QUAL_VOLATILE;
7981 if (declspecs->specs[(int)ds_restrict])
7982 type_quals |= TYPE_QUAL_RESTRICT;
7983 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7984 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7987 if (TREE_CODE (type) == FUNCTION_TYPE
7988 && type_quals != TYPE_UNQUALIFIED)
7990 /* This was an error in C++98 (cv-qualifiers cannot be added to
7991 a function type), but DR 295 makes the code well-formed by
7992 dropping the extra qualifiers. */
7995 tree bad_type = build_qualified_type (type, type_quals);
7996 pedwarn (input_location, OPT_pedantic,
7997 "ignoring %qV qualifiers added to function type %qT",
8000 type_quals = TYPE_UNQUALIFIED;
8002 type_quals |= cp_type_quals (type);
8003 type = cp_build_qualified_type_real
8004 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8005 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8006 /* We might have ignored or rejected some of the qualifiers. */
8007 type_quals = cp_type_quals (type);
8010 inlinep = !! declspecs->specs[(int)ds_inline];
8011 virtualp = !! declspecs->specs[(int)ds_virtual];
8012 explicitp = !! declspecs->specs[(int)ds_explicit];
8014 storage_class = declspecs->storage_class;
8015 if (storage_class == sc_static)
8016 staticp = 1 + (decl_context == FIELD);
8018 if (virtualp && staticp == 2)
8020 error ("member %qD cannot be declared both virtual and static", dname);
8021 storage_class = sc_none;
8024 friendp = !! declspecs->specs[(int)ds_friend];
8026 if (dependent_name && !friendp)
8028 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8029 return error_mark_node;
8032 /* Issue errors about use of storage classes for parameters. */
8033 if (decl_context == PARM)
8035 if (declspecs->specs[(int)ds_typedef])
8037 error ("typedef declaration invalid in parameter declaration");
8038 return error_mark_node;
8040 else if (storage_class == sc_static
8041 || storage_class == sc_extern
8043 error ("storage class specifiers invalid in parameter declarations");
8046 /* Give error if `virtual' is used outside of class declaration. */
8048 && (current_class_name == NULL_TREE || decl_context != FIELD))
8050 error ("%<virtual%> outside class declaration");
8054 /* Static anonymous unions are dealt with here. */
8055 if (staticp && decl_context == TYPENAME
8057 && ANON_AGGR_TYPE_P (declspecs->type))
8058 decl_context = FIELD;
8060 /* Warn about storage classes that are invalid for certain
8061 kinds of declarations (parameters, typenames, etc.). */
8064 && storage_class != sc_extern
8065 && storage_class != sc_static)
8066 || declspecs->specs[(int)ds_typedef]))
8068 error ("multiple storage classes in declaration of %qs", name);
8071 if (decl_context != NORMAL
8072 && ((storage_class != sc_none
8073 && storage_class != sc_mutable)
8076 if ((decl_context == PARM || decl_context == CATCHPARM)
8077 && (storage_class == sc_register
8078 || storage_class == sc_auto))
8080 else if (declspecs->specs[(int)ds_typedef])
8082 else if (decl_context == FIELD
8083 /* C++ allows static class elements. */
8084 && storage_class == sc_static)
8085 /* C++ also allows inlines and signed and unsigned elements,
8086 but in those cases we don't come in here. */
8090 if (decl_context == FIELD)
8091 error ("storage class specified for %qs", name);
8094 if (decl_context == PARM || decl_context == CATCHPARM)
8095 error ("storage class specified for parameter %qs", name);
8097 error ("storage class specified for typename");
8099 if (storage_class == sc_register
8100 || storage_class == sc_auto
8101 || storage_class == sc_extern
8103 storage_class = sc_none;
8106 else if (storage_class == sc_extern && funcdef_flag
8107 && ! toplevel_bindings_p ())
8108 error ("nested function %qs declared %<extern%>", name);
8109 else if (toplevel_bindings_p ())
8111 if (storage_class == sc_auto)
8112 error ("top-level declaration of %qs specifies %<auto%>", name);
8115 && storage_class != sc_extern
8116 && storage_class != sc_static)
8118 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8123 if (storage_class && friendp)
8125 error ("storage class specifiers invalid in friend function declarations");
8126 storage_class = sc_none;
8131 unqualified_id = NULL_TREE;
8134 unqualified_id = id_declarator->u.id.unqualified_name;
8135 switch (TREE_CODE (unqualified_id))
8139 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8142 case IDENTIFIER_NODE:
8143 case TEMPLATE_ID_EXPR:
8151 /* Determine the type of the entity declared by recurring on the
8153 for (; declarator; declarator = declarator->declarator)
8155 const cp_declarator *inner_declarator;
8158 if (type == error_mark_node)
8159 return error_mark_node;
8161 attrs = declarator->attributes;
8167 if (declarator == NULL || declarator->kind == cdk_id)
8168 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8169 if (declarator->kind == cdk_function)
8170 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8171 if (declarator->kind == cdk_array)
8172 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8173 returned_attrs = decl_attributes (&type,
8174 chainon (returned_attrs, attrs),
8178 if (declarator->kind == cdk_id)
8181 inner_declarator = declarator->declarator;
8183 switch (declarator->kind)
8186 type = create_array_type_for_decl (dname, type,
8187 declarator->u.array.bounds);
8195 /* Declaring a function type.
8196 Make sure we have a valid type for the function to return. */
8198 if (type_quals != TYPE_UNQUALIFIED)
8200 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8201 warning (OPT_Wignored_qualifiers,
8202 "type qualifiers ignored on function return type");
8203 /* We now know that the TYPE_QUALS don't apply to the
8204 decl, but to its return type. */
8205 type_quals = TYPE_UNQUALIFIED;
8206 set_no_warning = true;
8209 /* Error about some types functions can't return. */
8211 if (TREE_CODE (type) == FUNCTION_TYPE)
8213 error ("%qs declared as function returning a function", name);
8214 return error_mark_node;
8216 if (TREE_CODE (type) == ARRAY_TYPE)
8218 error ("%qs declared as function returning an array", name);
8219 return error_mark_node;
8222 /* Pick up type qualifiers which should be applied to `this'. */
8223 memfn_quals = declarator->u.function.qualifiers;
8225 /* Pick up the exception specifications. */
8226 raises = declarator->u.function.exception_specification;
8228 /* Handle a late-specified return type. */
8229 type = splice_late_return_type
8230 (type, declarator->u.function.late_return_type);
8231 if (type == error_mark_node)
8232 return error_mark_node;
8234 /* Say it's a definition only for the CALL_EXPR
8235 closest to the identifier. */
8236 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8238 if (ctype == NULL_TREE
8239 && decl_context == FIELD
8241 && (friendp == 0 || dname == current_class_name))
8242 ctype = current_class_type;
8244 if (ctype && (sfk == sfk_constructor
8245 || sfk == sfk_destructor))
8247 /* We are within a class's scope. If our declarator name
8248 is the same as the class name, and we are defining
8249 a function, then it is a constructor/destructor, and
8250 therefore returns a void type. */
8252 /* ISO C++ 12.4/2. A destructor may not be declared
8253 const or volatile. A destructor may not be
8256 ISO C++ 12.1. A constructor may not be declared
8257 const or volatile. A constructor may not be
8258 virtual. A constructor may not be static. */
8260 error ((flags == DTOR_FLAG)
8261 ? "destructor cannot be static member function"
8262 : "constructor cannot be static member function");
8265 error ((flags == DTOR_FLAG)
8266 ? "destructors may not be cv-qualified"
8267 : "constructors may not be cv-qualified");
8268 memfn_quals = TYPE_UNQUALIFIED;
8271 if (decl_context == FIELD
8272 && !member_function_or_else (ctype,
8275 return error_mark_node;
8277 if (flags != DTOR_FLAG)
8279 /* It's a constructor. */
8284 permerror (input_location, "constructors cannot be declared virtual");
8287 if (decl_context == FIELD
8288 && sfk != sfk_constructor)
8289 return error_mark_node;
8291 if (decl_context == FIELD)
8297 error ("can't initialize friend function %qs", name);
8300 /* Cannot be both friend and virtual. */
8301 error ("virtual functions cannot be friends");
8304 if (decl_context == NORMAL)
8305 error ("friend declaration not in class definition");
8306 if (current_function_decl && funcdef_flag)
8307 error ("can't define friend function %qs in a local "
8312 arg_types = grokparms (declarator->u.function.parameters,
8315 if (inner_declarator
8316 && inner_declarator->kind == cdk_id
8317 && inner_declarator->u.id.sfk == sfk_destructor
8318 && arg_types != void_list_node)
8320 error ("destructors may not have parameters");
8321 arg_types = void_list_node;
8325 type = build_function_type (type, arg_types);
8332 /* Filter out pointers-to-references and references-to-references.
8333 We can get these if a TYPE_DECL is used. */
8335 if (TREE_CODE (type) == REFERENCE_TYPE)
8337 if (declarator->kind != cdk_reference)
8339 error ("cannot declare pointer to %q#T", type);
8340 type = TREE_TYPE (type);
8343 /* In C++0x, we allow reference to reference declarations
8344 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8345 and template type arguments [14.3.1/4 temp.arg.type]. The
8346 check for direct reference to reference declarations, which
8347 are still forbidden, occurs below. Reasoning behind the change
8348 can be found in DR106, DR540, and the rvalue reference
8350 else if (cxx_dialect == cxx98)
8352 error ("cannot declare reference to %q#T", type);
8353 type = TREE_TYPE (type);
8356 else if (VOID_TYPE_P (type))
8358 if (declarator->kind == cdk_reference)
8359 error ("cannot declare reference to %q#T", type);
8360 else if (declarator->kind == cdk_ptrmem)
8361 error ("cannot declare pointer to %q#T member", type);
8364 /* We now know that the TYPE_QUALS don't apply to the decl,
8365 but to the target of the pointer. */
8366 type_quals = TYPE_UNQUALIFIED;
8368 if (declarator->kind == cdk_ptrmem
8369 && (TREE_CODE (type) == FUNCTION_TYPE
8370 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8372 memfn_quals |= cp_type_quals (type);
8373 type = build_memfn_type (type,
8374 declarator->u.pointer.class_type,
8376 memfn_quals = TYPE_UNQUALIFIED;
8379 if (declarator->kind == cdk_reference)
8381 /* In C++0x, the type we are creating a reference to might be
8382 a typedef which is itself a reference type. In that case,
8383 we follow the reference collapsing rules in
8384 [7.1.3/8 dcl.typedef] to create the final reference type:
8386 "If a typedef TD names a type that is a reference to a type
8387 T, an attempt to create the type 'lvalue reference to cv TD'
8388 creates the type 'lvalue reference to T,' while an attempt
8389 to create the type "rvalue reference to cv TD' creates the
8392 if (!VOID_TYPE_P (type))
8393 type = cp_build_reference_type
8394 ((TREE_CODE (type) == REFERENCE_TYPE
8395 ? TREE_TYPE (type) : type),
8396 (declarator->u.reference.rvalue_ref
8397 && (TREE_CODE(type) != REFERENCE_TYPE
8398 || TYPE_REF_IS_RVALUE (type))));
8400 /* In C++0x, we need this check for direct reference to
8401 reference declarations, which are forbidden by
8402 [8.3.2/5 dcl.ref]. Reference to reference declarations
8403 are only allowed indirectly through typedefs and template
8404 type arguments. Example:
8406 void foo(int & &); // invalid ref-to-ref decl
8408 typedef int & int_ref;
8409 void foo(int_ref &); // valid ref-to-ref decl
8411 if (inner_declarator && inner_declarator->kind == cdk_reference)
8412 error ("cannot declare reference to %q#T, which is not "
8413 "a typedef or a template type argument", type);
8415 else if (TREE_CODE (type) == METHOD_TYPE)
8416 type = build_ptrmemfunc_type (build_pointer_type (type));
8417 else if (declarator->kind == cdk_ptrmem)
8419 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8421 if (declarator->u.pointer.class_type == error_mark_node)
8422 /* We will already have complained. */
8423 type = error_mark_node;
8425 type = build_ptrmem_type (declarator->u.pointer.class_type,
8429 type = build_pointer_type (type);
8431 /* Process a list of type modifier keywords (such as
8432 const or volatile) that were given inside the `*' or `&'. */
8434 if (declarator->u.pointer.qualifiers)
8437 = cp_build_qualified_type (type,
8438 declarator->u.pointer.qualifiers);
8439 type_quals = cp_type_quals (type);
8452 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8453 && TREE_CODE (type) != FUNCTION_TYPE
8454 && TREE_CODE (type) != METHOD_TYPE)
8456 error ("template-id %qD used as a declarator",
8458 unqualified_id = dname;
8461 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8462 qualified with a class-name, turn it into a METHOD_TYPE, unless
8463 we know that the function is static. We take advantage of this
8464 opportunity to do other processing that pertains to entities
8465 explicitly declared to be class members. Note that if DECLARATOR
8466 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8467 would not have exited the loop above. */
8469 && declarator->u.id.qualifying_scope
8470 && TYPE_P (declarator->u.id.qualifying_scope))
8474 ctype = declarator->u.id.qualifying_scope;
8475 ctype = TYPE_MAIN_VARIANT (ctype);
8477 while (t != NULL_TREE && CLASS_TYPE_P (t))
8479 /* You're supposed to have one `template <...>' for every
8480 template class, but you don't need one for a full
8481 specialization. For example:
8483 template <class T> struct S{};
8484 template <> struct S<int> { void f(); };
8485 void S<int>::f () {}
8487 is correct; there shouldn't be a `template <>' for the
8488 definition of `S<int>::f'. */
8489 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8490 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8491 /* T is an explicit (not partial) specialization. All
8492 containing classes must therefore also be explicitly
8495 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8496 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8497 template_count += 1;
8499 t = TYPE_MAIN_DECL (t);
8500 t = DECL_CONTEXT (t);
8503 if (ctype == current_class_type)
8507 permerror (input_location, "member functions are implicitly friends of their class");
8511 permerror (declarator->id_loc,
8512 "extra qualification %<%T::%> on member %qs",
8515 else if (/* If the qualifying type is already complete, then we
8516 can skip the following checks. */
8517 !COMPLETE_TYPE_P (ctype)
8518 && (/* If the function is being defined, then
8519 qualifying type must certainly be complete. */
8521 /* A friend declaration of "T::f" is OK, even if
8522 "T" is a template parameter. But, if this
8523 function is not a friend, the qualifying type
8525 || (!friendp && !CLASS_TYPE_P (ctype))
8526 /* For a declaration, the type need not be
8527 complete, if either it is dependent (since there
8528 is no meaningful definition of complete in that
8529 case) or the qualifying class is currently being
8531 || !(dependent_type_p (ctype)
8532 || currently_open_class (ctype)))
8533 /* Check that the qualifying type is complete. */
8534 && !complete_type_or_else (ctype, NULL_TREE))
8535 return error_mark_node;
8536 else if (TREE_CODE (type) == FUNCTION_TYPE)
8538 tree sname = declarator->u.id.unqualified_name;
8540 if (current_class_type
8541 && (!friendp || funcdef_flag))
8544 ? "cannot define member function %<%T::%s%> within %<%T%>"
8545 : "cannot declare member function %<%T::%s%> within %<%T%>",
8546 ctype, name, current_class_type);
8547 return error_mark_node;
8550 if (TREE_CODE (sname) == IDENTIFIER_NODE
8551 && NEW_DELETE_OPNAME_P (sname))
8552 /* Overloaded operator new and operator delete
8553 are always static functions. */
8556 type = build_memfn_type (type, ctype, memfn_quals);
8558 else if (declspecs->specs[(int)ds_typedef]
8559 && current_class_type)
8561 error ("cannot declare member %<%T::%s%> within %qT",
8562 ctype, name, current_class_type);
8563 return error_mark_node;
8567 /* Now TYPE has the actual type. */
8572 *attrlist = chainon (returned_attrs, *attrlist);
8574 attrlist = &returned_attrs;
8577 /* Handle parameter packs. */
8578 if (parameter_pack_p)
8580 if (decl_context == PARM)
8581 /* Turn the type into a pack expansion.*/
8582 type = make_pack_expansion (type);
8584 error ("non-parameter %qs cannot be a parameter pack", name);
8587 /* Did array size calculations overflow? */
8589 if (TREE_CODE (type) == ARRAY_TYPE
8590 && COMPLETE_TYPE_P (type)
8591 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8592 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8594 error ("size of array %qs is too large", name);
8595 /* If we proceed with the array type as it is, we'll eventually
8596 crash in tree_low_cst(). */
8597 type = error_mark_node;
8600 if ((decl_context == FIELD || decl_context == PARM)
8601 && !processing_template_decl
8602 && variably_modified_type_p (type, NULL_TREE))
8604 if (decl_context == FIELD)
8605 error ("data member may not have variably modified type %qT", type);
8607 error ("parameter may not have variably modified type %qT", type);
8608 type = error_mark_node;
8611 if (explicitp == 1 || (explicitp && friendp))
8613 /* [dcl.fct.spec] The explicit specifier shall only be used in
8614 declarations of constructors within a class definition. */
8615 error ("only declarations of constructors can be %<explicit%>");
8619 if (storage_class == sc_mutable)
8621 if (decl_context != FIELD || friendp)
8623 error ("non-member %qs cannot be declared %<mutable%>", name);
8624 storage_class = sc_none;
8626 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8628 error ("non-object member %qs cannot be declared %<mutable%>", name);
8629 storage_class = sc_none;
8631 else if (TREE_CODE (type) == FUNCTION_TYPE
8632 || TREE_CODE (type) == METHOD_TYPE)
8634 error ("function %qs cannot be declared %<mutable%>", name);
8635 storage_class = sc_none;
8639 error ("static %qs cannot be declared %<mutable%>", name);
8640 storage_class = sc_none;
8642 else if (type_quals & TYPE_QUAL_CONST)
8644 error ("const %qs cannot be declared %<mutable%>", name);
8645 storage_class = sc_none;
8649 /* If this is declaring a typedef name, return a TYPE_DECL. */
8650 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8654 /* Note that the grammar rejects storage classes
8655 in typenames, fields or parameters. */
8656 if (current_lang_name == lang_name_java)
8657 TYPE_FOR_JAVA (type) = 1;
8659 /* This declaration:
8661 typedef void f(int) const;
8663 declares a function type which is not a member of any
8664 particular class, but which is cv-qualified; for
8665 example "f S::*" declares a pointer to a const-qualified
8666 member function of S. We record the cv-qualification in the
8668 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8670 type = cp_build_qualified_type (type, memfn_quals);
8672 /* We have now dealt with these qualifiers. */
8673 memfn_quals = TYPE_UNQUALIFIED;
8676 if (decl_context == FIELD)
8677 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8679 decl = build_decl (TYPE_DECL, unqualified_id, type);
8680 if (id_declarator && declarator->u.id.qualifying_scope)
8681 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8683 if (decl_context != FIELD)
8685 if (!current_function_decl)
8686 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8687 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8688 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8689 (current_function_decl)))
8690 /* The TYPE_DECL is "abstract" because there will be
8691 clones of this constructor/destructor, and there will
8692 be copies of this TYPE_DECL generated in those
8694 DECL_ABSTRACT (decl) = 1;
8696 else if (constructor_name_p (unqualified_id, current_class_type))
8697 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8698 "as enclosing class",
8701 /* If the user declares "typedef struct {...} foo" then the
8702 struct will have an anonymous name. Fill that name in now.
8703 Nothing can refer to it, so nothing needs know about the name
8705 if (type != error_mark_node
8708 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8709 && TYPE_ANONYMOUS_P (type)
8710 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8712 tree oldname = TYPE_NAME (type);
8715 /* Replace the anonymous name with the real name everywhere. */
8716 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8717 if (TYPE_NAME (t) == oldname)
8718 TYPE_NAME (t) = decl;
8720 if (TYPE_LANG_SPECIFIC (type))
8721 TYPE_WAS_ANONYMOUS (type) = 1;
8723 /* If this is a typedef within a template class, the nested
8724 type is a (non-primary) template. The name for the
8725 template needs updating as well. */
8726 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8727 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8728 = TYPE_IDENTIFIER (type);
8730 /* FIXME remangle member functions; member functions of a
8731 type with external linkage have external linkage. */
8735 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8736 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8738 bad_specifiers (decl, "type", virtualp,
8739 memfn_quals != TYPE_UNQUALIFIED,
8740 inlinep, friendp, raises != NULL_TREE);
8745 /* Detect the case of an array type of unspecified size
8746 which came, as such, direct from a typedef name.
8747 We must copy the type, so that the array's domain can be
8748 individually set by the object's initializer. */
8750 if (type && typedef_type
8751 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8752 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8753 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8755 /* Detect where we're using a typedef of function type to declare a
8756 function. PARMS will not be set, so we must create it now. */
8758 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8760 tree decls = NULL_TREE;
8763 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8765 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8767 TREE_CHAIN (decl) = decls;
8771 parms = nreverse (decls);
8773 if (decl_context != TYPENAME)
8775 /* A cv-qualifier-seq shall only be part of the function type
8776 for a non-static member function. [8.3.5/4 dcl.fct] */
8777 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8778 && (current_class_type == NULL_TREE || staticp) )
8781 ? G_("qualified function types cannot be used to "
8782 "declare static member functions")
8783 : G_("qualified function types cannot be used to "
8784 "declare free functions"));
8785 type = TYPE_MAIN_VARIANT (type);
8788 /* The qualifiers on the function type become the qualifiers on
8789 the non-static member function. */
8790 memfn_quals |= cp_type_quals (type);
8794 /* If this is a type name (such as, in a cast or sizeof),
8795 compute the type and return it now. */
8797 if (decl_context == TYPENAME)
8799 /* Note that the grammar rejects storage classes
8800 in typenames, fields or parameters. */
8801 if (type_quals != TYPE_UNQUALIFIED)
8802 type_quals = TYPE_UNQUALIFIED;
8804 /* Special case: "friend class foo" looks like a TYPENAME context. */
8807 if (type_quals != TYPE_UNQUALIFIED)
8809 error ("type qualifiers specified for friend class declaration");
8810 type_quals = TYPE_UNQUALIFIED;
8814 error ("%<inline%> specified for friend class declaration");
8820 /* Don't allow friend declaration without a class-key. */
8821 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8822 permerror (input_location, "template parameters cannot be friends");
8823 else if (TREE_CODE (type) == TYPENAME_TYPE)
8824 permerror (input_location, "friend declaration requires class-key, "
8825 "i.e. %<friend class %T::%D%>",
8826 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8828 permerror (input_location, "friend declaration requires class-key, "
8829 "i.e. %<friend %#T%>",
8833 /* Only try to do this stuff if we didn't already give up. */
8834 if (type != integer_type_node)
8836 /* A friendly class? */
8837 if (current_class_type)
8838 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8841 error ("trying to make class %qT a friend of global scope",
8844 type = void_type_node;
8847 else if (memfn_quals)
8849 if (ctype == NULL_TREE)
8851 if (TREE_CODE (type) != METHOD_TYPE)
8852 error ("invalid qualifiers on non-member function type");
8854 ctype = TYPE_METHOD_BASETYPE (type);
8857 type = build_memfn_type (type, ctype, memfn_quals);
8862 else if (unqualified_id == NULL_TREE && decl_context != PARM
8863 && decl_context != CATCHPARM
8864 && TREE_CODE (type) != UNION_TYPE
8867 error ("abstract declarator %qT used as declaration", type);
8868 return error_mark_node;
8871 /* Only functions may be declared using an operator-function-id. */
8873 && IDENTIFIER_OPNAME_P (unqualified_id)
8874 && TREE_CODE (type) != FUNCTION_TYPE
8875 && TREE_CODE (type) != METHOD_TYPE)
8877 error ("declaration of %qD as non-function", unqualified_id);
8878 return error_mark_node;
8881 /* We don't check parameter types here because we can emit a better
8882 error message later. */
8883 if (decl_context != PARM)
8885 type = check_var_type (unqualified_id, type);
8886 if (type == error_mark_node)
8887 return error_mark_node;
8890 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8891 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8893 if (decl_context == PARM || decl_context == CATCHPARM)
8895 if (ctype || in_namespace)
8896 error ("cannot use %<::%> in parameter declaration");
8898 /* A parameter declared as an array of T is really a pointer to T.
8899 One declared as a function is really a pointer to a function.
8900 One declared as a member is really a pointer to member. */
8902 if (TREE_CODE (type) == ARRAY_TYPE)
8904 /* Transfer const-ness of array into that of type pointed to. */
8905 type = build_pointer_type (TREE_TYPE (type));
8906 type_quals = TYPE_UNQUALIFIED;
8908 else if (TREE_CODE (type) == FUNCTION_TYPE)
8909 type = build_pointer_type (type);
8915 if (decl_context == PARM)
8917 decl = cp_build_parm_decl (unqualified_id, type);
8919 bad_specifiers (decl, "parameter", virtualp,
8920 memfn_quals != TYPE_UNQUALIFIED,
8921 inlinep, friendp, raises != NULL_TREE);
8923 else if (decl_context == FIELD)
8925 /* The C99 flexible array extension. */
8926 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8927 && TYPE_DOMAIN (type) == NULL_TREE)
8929 tree itype = compute_array_index_type (dname, integer_zero_node);
8930 type = build_cplus_array_type (TREE_TYPE (type), itype);
8933 if (type == error_mark_node)
8935 /* Happens when declaring arrays of sizes which
8936 are error_mark_node, for example. */
8939 else if (in_namespace && !friendp)
8941 /* Something like struct S { int N::j; }; */
8942 error ("invalid use of %<::%>");
8943 return error_mark_node;
8945 else if (TREE_CODE (type) == FUNCTION_TYPE)
8948 tree function_context;
8952 if (ctype == NULL_TREE)
8953 ctype = current_class_type;
8955 if (ctype == NULL_TREE)
8957 error ("can't make %qD into a method -- not in a class",
8959 return error_mark_node;
8962 /* ``A union may [ ... ] not [ have ] virtual functions.''
8964 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8966 error ("function %qD declared virtual inside a union",
8968 return error_mark_node;
8971 if (NEW_DELETE_OPNAME_P (unqualified_id))
8975 error ("%qD cannot be declared virtual, since it "
8981 else if (staticp < 2)
8982 type = build_memfn_type (type, ctype, memfn_quals);
8985 /* Check that the name used for a destructor makes sense. */
8986 if (sfk == sfk_destructor)
8990 gcc_assert (friendp);
8991 error ("expected qualified name in friend declaration "
8992 "for destructor %qD",
8993 id_declarator->u.id.unqualified_name);
8994 return error_mark_node;
8997 if (!same_type_p (TREE_OPERAND
8998 (id_declarator->u.id.unqualified_name, 0),
9001 error ("declaration of %qD as member of %qT",
9002 id_declarator->u.id.unqualified_name, ctype);
9003 return error_mark_node;
9006 else if (sfk == sfk_constructor && friendp)
9008 error ("expected qualified name in friend declaration "
9009 "for constructor %qD",
9010 id_declarator->u.id.unqualified_name);
9011 return error_mark_node;
9014 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9015 function_context = (ctype != NULL_TREE) ?
9016 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9017 publicp = (! friendp || ! staticp)
9018 && function_context == NULL_TREE;
9019 decl = grokfndecl (ctype, type,
9020 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9021 ? unqualified_id : dname,
9024 virtualp, flags, memfn_quals, raises,
9025 friendp ? -1 : 0, friendp, publicp, inlinep,
9027 funcdef_flag, template_count, in_namespace, attrlist);
9028 if (decl == NULL_TREE)
9029 return error_mark_node;
9031 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9032 /* The decl and setting of decl_attr is also turned off. */
9033 decl = build_decl_attribute_variant (decl, decl_attr);
9036 /* [class.conv.ctor]
9038 A constructor declared without the function-specifier
9039 explicit that can be called with a single parameter
9040 specifies a conversion from the type of its first
9041 parameter to the type of its class. Such a constructor
9042 is called a converting constructor. */
9044 DECL_NONCONVERTING_P (decl) = 1;
9045 else if (DECL_CONSTRUCTOR_P (decl))
9047 /* A constructor with no parms is not a conversion.
9048 Ignore any compiler-added parms. */
9049 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
9051 if (arg_types == void_list_node)
9052 DECL_NONCONVERTING_P (decl) = 1;
9055 else if (TREE_CODE (type) == METHOD_TYPE)
9057 /* We only get here for friend declarations of
9058 members of other classes. */
9059 /* All method decls are public, so tell grokfndecl to set
9060 TREE_PUBLIC, also. */
9061 decl = grokfndecl (ctype, type,
9062 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9063 ? unqualified_id : dname,
9066 virtualp, flags, memfn_quals, raises,
9067 friendp ? -1 : 0, friendp, 1, 0, sfk,
9068 funcdef_flag, template_count, in_namespace,
9070 if (decl == NULL_TREE)
9071 return error_mark_node;
9073 else if (!staticp && !dependent_type_p (type)
9074 && !COMPLETE_TYPE_P (complete_type (type))
9075 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9078 error ("field %qD has incomplete type", unqualified_id);
9080 error ("name %qT has incomplete type", type);
9082 /* If we're instantiating a template, tell them which
9083 instantiation made the field's type be incomplete. */
9084 if (current_class_type
9085 && TYPE_NAME (current_class_type)
9086 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9088 && declspecs->type == type)
9089 error (" in instantiation of template %qT",
9090 current_class_type);
9092 return error_mark_node;
9098 error ("%qE is neither function nor member function; "
9099 "cannot be declared friend", unqualified_id);
9107 /* Friends are treated specially. */
9108 if (ctype == current_class_type)
9109 ; /* We already issued a permerror. */
9110 else if (decl && DECL_NAME (decl))
9112 if (template_class_depth (current_class_type) == 0)
9114 decl = check_explicit_specialization
9115 (unqualified_id, decl, template_count,
9116 2 * funcdef_flag + 4);
9117 if (decl == error_mark_node)
9118 return error_mark_node;
9121 decl = do_friend (ctype, unqualified_id, decl,
9127 return error_mark_node;
9130 /* Structure field. It may not be a function, except for C++. */
9132 if (decl == NULL_TREE)
9138 /* An attempt is being made to initialize a non-static
9139 member. But, from [class.mem]:
9141 4 A member-declarator can contain a
9142 constant-initializer only if it declares a static
9143 member (_class.static_) of integral or enumeration
9144 type, see _class.static.data_.
9146 This used to be relatively common practice, but
9147 the rest of the compiler does not correctly
9148 handle the initialization unless the member is
9149 static so we make it static below. */
9150 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9152 permerror (input_location, "making %qD static", unqualified_id);
9156 if (uses_template_parms (type))
9157 /* We'll check at instantiation time. */
9159 else if (check_static_variable_definition (unqualified_id,
9161 /* If we just return the declaration, crashes
9162 will sometimes occur. We therefore return
9163 void_type_node, as if this was a friend
9164 declaration, to cause callers to completely
9165 ignore this declaration. */
9166 return error_mark_node;
9171 /* C++ allows static class members. All other work
9172 for this is done by grokfield. */
9173 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9174 set_linkage_for_static_data_member (decl);
9175 /* Even if there is an in-class initialization, DECL
9176 is considered undefined until an out-of-class
9177 definition is provided. */
9178 DECL_EXTERNAL (decl) = 1;
9181 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9185 decl = build_decl (FIELD_DECL, unqualified_id, type);
9186 DECL_NONADDRESSABLE_P (decl) = bitfield;
9187 if (bitfield && !unqualified_id)
9188 TREE_NO_WARNING (decl) = 1;
9190 if (storage_class == sc_mutable)
9192 DECL_MUTABLE_P (decl) = 1;
9193 storage_class = sc_none;
9197 bad_specifiers (decl, "field", virtualp,
9198 memfn_quals != TYPE_UNQUALIFIED,
9199 inlinep, friendp, raises != NULL_TREE);
9202 else if (TREE_CODE (type) == FUNCTION_TYPE
9203 || TREE_CODE (type) == METHOD_TYPE)
9208 if (!unqualified_id)
9209 return error_mark_node;
9211 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9212 original_name = dname;
9214 original_name = unqualified_id;
9216 if (storage_class == sc_auto)
9217 error ("storage class %<auto%> invalid for function %qs", name);
9218 else if (storage_class == sc_register)
9219 error ("storage class %<register%> invalid for function %qs", name);
9221 error ("storage class %<__thread%> invalid for function %qs", name);
9223 /* Function declaration not at top level.
9224 Storage classes other than `extern' are not allowed
9225 and `extern' makes no difference. */
9226 if (! toplevel_bindings_p ()
9227 && (storage_class == sc_static
9228 || declspecs->specs[(int)ds_inline])
9231 if (storage_class == sc_static)
9232 pedwarn (input_location, OPT_pedantic,
9233 "%<static%> specified invalid for function %qs "
9234 "declared out of global scope", name);
9236 pedwarn (input_location, OPT_pedantic,
9237 "%<inline%> specifier invalid for function %qs "
9238 "declared out of global scope", name);
9241 if (ctype == NULL_TREE)
9245 error ("virtual non-class function %qs", name);
9249 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9250 && !NEW_DELETE_OPNAME_P (original_name))
9251 type = build_method_type_directly (ctype,
9253 TYPE_ARG_TYPES (type));
9255 /* Record presence of `static'. */
9256 publicp = (ctype != NULL_TREE
9257 || storage_class == sc_extern
9258 || storage_class != sc_static);
9260 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9261 virtualp, flags, memfn_quals, raises,
9263 publicp, inlinep, sfk, funcdef_flag,
9264 template_count, in_namespace, attrlist);
9265 if (decl == NULL_TREE)
9266 return error_mark_node;
9270 int invalid_static = 0;
9272 /* Don't allow a static member function in a class, and forbid
9273 declaring main to be static. */
9274 if (TREE_CODE (type) == METHOD_TYPE)
9276 permerror (input_location, "cannot declare member function %qD to have "
9277 "static linkage", decl);
9280 else if (current_function_decl)
9282 /* FIXME need arm citation */
9283 error ("cannot declare static function inside another function");
9290 storage_class = sc_none;
9296 /* It's a variable. */
9298 /* An uninitialized decl with `extern' is a reference. */
9299 decl = grokvardecl (type, unqualified_id,
9302 (type_quals & TYPE_QUAL_CONST) != 0,
9303 ctype ? ctype : in_namespace);
9304 bad_specifiers (decl, "variable", virtualp,
9305 memfn_quals != TYPE_UNQUALIFIED,
9306 inlinep, friendp, raises != NULL_TREE);
9310 DECL_CONTEXT (decl) = ctype;
9313 permerror (input_location, "%<static%> may not be used when defining "
9314 "(as opposed to declaring) a static data member");
9316 storage_class = sc_none;
9318 if (storage_class == sc_register && TREE_STATIC (decl))
9320 error ("static member %qD declared %<register%>", decl);
9321 storage_class = sc_none;
9323 if (storage_class == sc_extern && pedantic)
9325 pedwarn (input_location, OPT_pedantic,
9326 "cannot explicitly declare member %q#D to have "
9327 "extern linkage", decl);
9328 storage_class = sc_none;
9333 if (storage_class == sc_extern && initialized && !funcdef_flag)
9335 if (toplevel_bindings_p ())
9337 /* It's common practice (and completely valid) to have a const
9338 be initialized and declared extern. */
9339 if (!(type_quals & TYPE_QUAL_CONST))
9340 warning (0, "%qs initialized and declared %<extern%>", name);
9344 error ("%qs has both %<extern%> and initializer", name);
9345 return error_mark_node;
9349 /* Record `register' declaration for warnings on &
9350 and in case doing stupid register allocation. */
9352 if (storage_class == sc_register)
9353 DECL_REGISTER (decl) = 1;
9354 else if (storage_class == sc_extern)
9355 DECL_THIS_EXTERN (decl) = 1;
9356 else if (storage_class == sc_static)
9357 DECL_THIS_STATIC (decl) = 1;
9359 /* Record constancy and volatility on the DECL itself . There's
9360 no need to do this when processing a template; we'll do this
9361 for the instantiated declaration based on the type of DECL. */
9362 if (!processing_template_decl)
9363 cp_apply_type_quals_to_decl (type_quals, decl);
9366 TREE_NO_WARNING (decl) = 1;
9372 /* Subroutine of start_function. Ensure that each of the parameter
9373 types (as listed in PARMS) is complete, as is required for a
9374 function definition. */
9377 require_complete_types_for_parms (tree parms)
9379 for (; parms; parms = TREE_CHAIN (parms))
9381 if (dependent_type_p (TREE_TYPE (parms)))
9383 if (!VOID_TYPE_P (TREE_TYPE (parms))
9384 && complete_type_or_else (TREE_TYPE (parms), parms))
9386 relayout_decl (parms);
9387 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9390 /* grokparms or complete_type_or_else will have already issued
9392 TREE_TYPE (parms) = error_mark_node;
9396 /* Returns nonzero if T is a local variable. */
9399 local_variable_p (const_tree t)
9401 if ((TREE_CODE (t) == VAR_DECL
9402 /* A VAR_DECL with a context that is a _TYPE is a static data
9404 && !TYPE_P (CP_DECL_CONTEXT (t))
9405 /* Any other non-local variable must be at namespace scope. */
9406 && !DECL_NAMESPACE_SCOPE_P (t))
9407 || (TREE_CODE (t) == PARM_DECL))
9413 /* Like local_variable_p, but suitable for use as a tree-walking
9417 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9418 void *data ATTRIBUTE_UNUSED)
9420 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9422 else if (TYPE_P (*tp))
9429 /* Check that ARG, which is a default-argument expression for a
9430 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9431 something goes wrong. DECL may also be a _TYPE node, rather than a
9432 DECL, if there is no DECL available. */
9435 check_default_argument (tree decl, tree arg)
9440 if (TREE_CODE (arg) == DEFAULT_ARG)
9441 /* We get a DEFAULT_ARG when looking at an in-class declaration
9442 with a default argument. Ignore the argument for now; we'll
9443 deal with it after the class is complete. */
9452 decl_type = TREE_TYPE (decl);
9454 if (arg == error_mark_node
9455 || decl == error_mark_node
9456 || TREE_TYPE (arg) == error_mark_node
9457 || decl_type == error_mark_node)
9458 /* Something already went wrong. There's no need to check
9460 return error_mark_node;
9462 /* [dcl.fct.default]
9464 A default argument expression is implicitly converted to the
9466 if (!TREE_TYPE (arg)
9467 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9470 error ("default argument for %q#D has type %qT",
9471 decl, TREE_TYPE (arg));
9473 error ("default argument for parameter of type %qT has type %qT",
9474 decl_type, TREE_TYPE (arg));
9476 return error_mark_node;
9479 /* [dcl.fct.default]
9481 Local variables shall not be used in default argument
9484 The keyword `this' shall not be used in a default argument of a
9486 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9489 error ("default argument %qE uses local variable %qD", arg, var);
9490 return error_mark_node;
9497 /* Decode the list of parameter types for a function type.
9498 Given the list of things declared inside the parens,
9499 return a list of types.
9501 If this parameter does not end with an ellipsis, we append
9504 *PARMS is set to the chain of PARM_DECLs created. */
9507 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9509 tree result = NULL_TREE;
9510 tree decls = NULL_TREE;
9511 int ellipsis = !first_parm || first_parm->ellipsis_p;
9512 cp_parameter_declarator *parm;
9514 struct pointer_set_t *unique_decls = pointer_set_create ();
9516 for (parm = first_parm; parm != NULL; parm = parm->next)
9518 tree type = NULL_TREE;
9519 tree init = parm->default_argument;
9523 if (parm == no_parameters)
9526 attrs = parm->decl_specifiers.attributes;
9527 parm->decl_specifiers.attributes = NULL_TREE;
9528 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9529 PARM, init != NULL_TREE, &attrs);
9530 if (! decl || TREE_TYPE (decl) == error_mark_node)
9534 cplus_decl_attributes (&decl, attrs, 0);
9536 type = TREE_TYPE (decl);
9537 if (VOID_TYPE_P (type))
9539 if (same_type_p (type, void_type_node)
9540 && DECL_SELF_REFERENCE_P (type)
9541 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9542 /* this is a parmlist of `(void)', which is ok. */
9544 cxx_incomplete_type_error (decl, type);
9545 /* It's not a good idea to actually create parameters of
9546 type `void'; other parts of the compiler assume that a
9547 void type terminates the parameter list. */
9548 type = error_mark_node;
9549 TREE_TYPE (decl) = error_mark_node;
9552 if (type != error_mark_node
9553 && TYPE_FOR_JAVA (type)
9554 && MAYBE_CLASS_TYPE_P (type))
9556 error ("parameter %qD has Java class type", decl);
9557 type = error_mark_node;
9558 TREE_TYPE (decl) = error_mark_node;
9562 if (type != error_mark_node)
9564 /* Top-level qualifiers on the parameters are
9565 ignored for function types. */
9566 type = cp_build_qualified_type (type, 0);
9567 if (TREE_CODE (type) == METHOD_TYPE)
9569 error ("parameter %qD invalidly declared method type", decl);
9570 type = build_pointer_type (type);
9571 TREE_TYPE (decl) = type;
9573 else if (abstract_virtuals_error (decl, type))
9574 any_error = 1; /* Seems like a good idea. */
9575 else if (POINTER_TYPE_P (type))
9577 /* [dcl.fct]/6, parameter types cannot contain pointers
9578 (references) to arrays of unknown bound. */
9579 tree t = TREE_TYPE (type);
9580 int ptr = TYPE_PTR_P (type);
9586 else if (TREE_CODE (t) != ARRAY_TYPE)
9588 else if (!TYPE_DOMAIN (t))
9592 if (TREE_CODE (t) == ARRAY_TYPE)
9593 error ("parameter %qD includes %s to array of unknown "
9595 decl, ptr ? "pointer" : "reference", t);
9600 else if (init && !processing_template_decl)
9601 init = check_default_argument (decl, init);
9604 if (TREE_CODE (decl) == PARM_DECL
9605 && FUNCTION_PARAMETER_PACK_P (decl)
9607 error ("parameter packs must be at the end of the parameter list");
9609 if (DECL_NAME (decl))
9611 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9612 error ("multiple parameters named %qE", DECL_NAME (decl));
9614 pointer_set_insert (unique_decls, DECL_NAME (decl));
9617 TREE_CHAIN (decl) = decls;
9619 result = tree_cons (init, type, result);
9621 decls = nreverse (decls);
9622 result = nreverse (result);
9624 result = chainon (result, void_list_node);
9627 pointer_set_destroy (unique_decls);
9632 /* D is a constructor or overloaded `operator='.
9634 Let T be the class in which D is declared. Then, this function
9637 -1 if D's is an ill-formed constructor or copy assignment operator
9638 whose first parameter is of type `T'.
9639 0 if D is not a copy constructor or copy assignment
9641 1 if D is a copy constructor or copy assignment operator whose
9642 first parameter is a reference to const qualified T.
9643 2 if D is a copy constructor or copy assignment operator whose
9644 first parameter is a reference to non-const qualified T.
9646 This function can be used as a predicate. Positive values indicate
9647 a copy constructor and nonzero values indicate a copy assignment
9651 copy_fn_p (const_tree d)
9657 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9659 if (TREE_CODE (d) == TEMPLATE_DECL
9660 || (DECL_TEMPLATE_INFO (d)
9661 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9662 /* Instantiations of template member functions are never copy
9663 functions. Note that member functions of templated classes are
9664 represented as template functions internally, and we must
9665 accept those as copy functions. */
9668 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9672 arg_type = TREE_VALUE (args);
9673 if (arg_type == error_mark_node)
9676 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9678 /* Pass by value copy assignment operator. */
9681 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9682 && !TYPE_REF_IS_RVALUE (arg_type)
9683 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9685 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9691 args = TREE_CHAIN (args);
9693 if (args && args != void_list_node && !TREE_PURPOSE (args))
9694 /* There are more non-optional args. */
9700 /* D is a constructor or overloaded `operator='.
9702 Let T be the class in which D is declared. Then, this function
9703 returns true when D is a move constructor or move assignment
9704 operator, false otherwise. */
9707 move_fn_p (const_tree d)
9711 bool result = false;
9713 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9715 if (cxx_dialect == cxx98)
9716 /* There are no move constructors if we are in C++98 mode. */
9719 if (TREE_CODE (d) == TEMPLATE_DECL
9720 || (DECL_TEMPLATE_INFO (d)
9721 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9722 /* Instantiations of template member functions are never copy
9723 functions. Note that member functions of templated classes are
9724 represented as template functions internally, and we must
9725 accept those as copy functions. */
9728 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9732 arg_type = TREE_VALUE (args);
9733 if (arg_type == error_mark_node)
9736 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9737 && TYPE_REF_IS_RVALUE (arg_type)
9738 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9742 args = TREE_CHAIN (args);
9744 if (args && args != void_list_node && !TREE_PURPOSE (args))
9745 /* There are more non-optional args. */
9751 /* Remember any special properties of member function DECL. */
9754 grok_special_member_properties (tree decl)
9758 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9761 class_type = DECL_CONTEXT (decl);
9762 if (DECL_CONSTRUCTOR_P (decl))
9764 int ctor = copy_fn_p (decl);
9766 if (!DECL_ARTIFICIAL (decl))
9767 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9773 A non-template constructor for class X is a copy
9774 constructor if its first parameter is of type X&, const
9775 X&, volatile X& or const volatile X&, and either there
9776 are no other parameters or else all other parameters have
9777 default arguments. */
9778 TYPE_HAS_INIT_REF (class_type) = 1;
9779 if (!DECL_DEFAULTED_FN (decl))
9780 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9782 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9784 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9785 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9786 else if (is_list_ctor (decl))
9787 TYPE_HAS_LIST_CTOR (class_type) = 1;
9789 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9793 A non-template assignment operator for class X is a copy
9794 assignment operator if its parameter is of type X, X&, const
9795 X&, volatile X& or const volatile X&. */
9797 int assop = copy_fn_p (decl);
9801 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9802 if (!DECL_DEFAULTED_FN (decl))
9803 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9805 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9810 /* Check a constructor DECL has the correct form. Complains
9811 if the class has a constructor of the form X(X). */
9814 grok_ctor_properties (const_tree ctype, const_tree decl)
9816 int ctor_parm = copy_fn_p (decl);
9822 A declaration of a constructor for a class X is ill-formed if
9823 its first parameter is of type (optionally cv-qualified) X
9824 and either there are no other parameters or else all other
9825 parameters have default arguments.
9827 We *don't* complain about member template instantiations that
9828 have this form, though; they can occur as we try to decide
9829 what constructor to use during overload resolution. Since
9830 overload resolution will never prefer such a constructor to
9831 the non-template copy constructor (which is either explicitly
9832 or implicitly defined), there's no need to worry about their
9833 existence. Theoretically, they should never even be
9834 instantiated, but that's hard to forestall. */
9835 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9843 /* An operator with this code is unary, but can also be binary. */
9846 ambi_op_p (enum tree_code code)
9848 return (code == INDIRECT_REF
9849 || code == ADDR_EXPR
9850 || code == UNARY_PLUS_EXPR
9851 || code == NEGATE_EXPR
9852 || code == PREINCREMENT_EXPR
9853 || code == PREDECREMENT_EXPR);
9856 /* An operator with this name can only be unary. */
9859 unary_op_p (enum tree_code code)
9861 return (code == TRUTH_NOT_EXPR
9862 || code == BIT_NOT_EXPR
9863 || code == COMPONENT_REF
9864 || code == TYPE_EXPR);
9867 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9868 errors are issued for invalid declarations. */
9871 grok_op_properties (tree decl, bool complain)
9873 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9875 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9876 tree name = DECL_NAME (decl);
9877 enum tree_code operator_code;
9882 /* Count the number of arguments and check for ellipsis. */
9883 for (argtype = argtypes, arity = 0;
9884 argtype && argtype != void_list_node;
9885 argtype = TREE_CHAIN (argtype))
9887 ellipsis_p = !argtype;
9889 class_type = DECL_CONTEXT (decl);
9890 if (class_type && !CLASS_TYPE_P (class_type))
9891 class_type = NULL_TREE;
9893 if (DECL_CONV_FN_P (decl))
9894 operator_code = TYPE_EXPR;
9898 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9899 if (ansi_opname (CODE) == name) \
9901 operator_code = (CODE); \
9904 else if (ansi_assopname (CODE) == name) \
9906 operator_code = (CODE); \
9907 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9911 #include "operators.def"
9917 gcc_assert (operator_code != MAX_TREE_CODES);
9918 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9921 switch (operator_code)
9924 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9928 TYPE_GETS_DELETE (class_type) |= 1;
9932 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9935 case VEC_DELETE_EXPR:
9936 TYPE_GETS_DELETE (class_type) |= 2;
9943 /* [basic.std.dynamic.allocation]/1:
9945 A program is ill-formed if an allocation function is declared
9946 in a namespace scope other than global scope or declared static
9949 The same also holds true for deallocation functions. */
9950 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9951 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9953 if (DECL_NAMESPACE_SCOPE_P (decl))
9955 if (CP_DECL_CONTEXT (decl) != global_namespace)
9957 error ("%qD may not be declared within a namespace", decl);
9960 else if (!TREE_PUBLIC (decl))
9962 error ("%qD may not be declared as static", decl);
9968 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9970 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9971 DECL_IS_OPERATOR_NEW (decl) = 1;
9973 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9974 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9977 /* An operator function must either be a non-static member function
9978 or have at least one parameter of a class, a reference to a class,
9979 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9980 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9982 if (operator_code == TYPE_EXPR
9983 || operator_code == CALL_EXPR
9984 || operator_code == COMPONENT_REF
9985 || operator_code == ARRAY_REF
9986 || operator_code == NOP_EXPR)
9988 error ("%qD must be a nonstatic member function", decl);
9995 if (DECL_STATIC_FUNCTION_P (decl))
9997 error ("%qD must be either a non-static member "
9998 "function or a non-member function", decl);
10002 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10004 tree arg = non_reference (TREE_VALUE (p));
10005 if (arg == error_mark_node)
10008 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10009 because these checks are performed even on
10010 template functions. */
10011 if (MAYBE_CLASS_TYPE_P (arg)
10012 || TREE_CODE (arg) == ENUMERAL_TYPE)
10016 if (!p || p == void_list_node)
10019 error ("%qD must have an argument of class or "
10020 "enumerated type", decl);
10026 /* There are no restrictions on the arguments to an overloaded
10028 if (operator_code == CALL_EXPR)
10031 /* Warn about conversion operators that will never be used. */
10032 if (IDENTIFIER_TYPENAME_P (name)
10033 && ! DECL_TEMPLATE_INFO (decl)
10035 /* Warn only declaring the function; there is no need to
10036 warn again about out-of-class definitions. */
10037 && class_type == current_class_type)
10039 tree t = TREE_TYPE (name);
10040 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10041 const char *what = 0;
10044 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10046 if (TREE_CODE (t) == VOID_TYPE)
10048 else if (class_type)
10050 if (t == class_type)
10051 what = "the same type";
10052 /* Don't force t to be complete here. */
10053 else if (MAYBE_CLASS_TYPE_P (t)
10054 && COMPLETE_TYPE_P (t)
10055 && DERIVED_FROM_P (t, class_type))
10056 what = "a base class";
10060 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10061 "conversion operator",
10062 ref ? "a reference to " : "", what);
10065 if (operator_code == COND_EXPR)
10068 error ("ISO C++ prohibits overloading operator ?:");
10071 else if (ellipsis_p)
10073 error ("%qD must not have variable number of arguments", decl);
10076 else if (ambi_op_p (operator_code))
10079 /* We pick the one-argument operator codes by default, so
10080 we don't have to change anything. */
10082 else if (arity == 2)
10084 /* If we thought this was a unary operator, we now know
10085 it to be a binary operator. */
10086 switch (operator_code)
10089 operator_code = MULT_EXPR;
10093 operator_code = BIT_AND_EXPR;
10096 case UNARY_PLUS_EXPR:
10097 operator_code = PLUS_EXPR;
10101 operator_code = MINUS_EXPR;
10104 case PREINCREMENT_EXPR:
10105 operator_code = POSTINCREMENT_EXPR;
10108 case PREDECREMENT_EXPR:
10109 operator_code = POSTDECREMENT_EXPR;
10113 gcc_unreachable ();
10116 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10118 if ((operator_code == POSTINCREMENT_EXPR
10119 || operator_code == POSTDECREMENT_EXPR)
10120 && ! processing_template_decl
10121 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10124 error ("postfix %qD must take %<int%> as its argument",
10127 error ("postfix %qD must take %<int%> as its second "
10135 error ("%qD must take either zero or one argument", decl);
10137 error ("%qD must take either one or two arguments", decl);
10141 /* More Effective C++ rule 6. */
10143 && (operator_code == POSTINCREMENT_EXPR
10144 || operator_code == POSTDECREMENT_EXPR
10145 || operator_code == PREINCREMENT_EXPR
10146 || operator_code == PREDECREMENT_EXPR))
10148 tree arg = TREE_VALUE (argtypes);
10149 tree ret = TREE_TYPE (TREE_TYPE (decl));
10150 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10151 arg = TREE_TYPE (arg);
10152 arg = TYPE_MAIN_VARIANT (arg);
10153 if (operator_code == PREINCREMENT_EXPR
10154 || operator_code == PREDECREMENT_EXPR)
10156 if (TREE_CODE (ret) != REFERENCE_TYPE
10157 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10159 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10160 build_reference_type (arg));
10164 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10165 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10169 else if (unary_op_p (operator_code))
10174 error ("%qD must take %<void%>", decl);
10176 error ("%qD must take exactly one argument", decl);
10180 else /* if (binary_op_p (operator_code)) */
10185 error ("%qD must take exactly one argument", decl);
10187 error ("%qD must take exactly two arguments", decl);
10191 /* More Effective C++ rule 7. */
10193 && (operator_code == TRUTH_ANDIF_EXPR
10194 || operator_code == TRUTH_ORIF_EXPR
10195 || operator_code == COMPOUND_EXPR))
10196 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10200 /* Effective C++ rule 23. */
10203 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10204 && (operator_code == PLUS_EXPR
10205 || operator_code == MINUS_EXPR
10206 || operator_code == TRUNC_DIV_EXPR
10207 || operator_code == MULT_EXPR
10208 || operator_code == TRUNC_MOD_EXPR)
10209 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10210 warning (OPT_Weffc__, "%qD should return by value", decl);
10212 /* [over.oper]/8 */
10213 for (; argtypes && argtypes != void_list_node;
10214 argtypes = TREE_CHAIN (argtypes))
10215 if (TREE_PURPOSE (argtypes))
10217 TREE_PURPOSE (argtypes) = NULL_TREE;
10218 if (operator_code == POSTINCREMENT_EXPR
10219 || operator_code == POSTDECREMENT_EXPR)
10221 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10226 error ("%qD cannot have default arguments", decl);
10234 /* Return a string giving the keyword associate with CODE. */
10236 static const char *
10237 tag_name (enum tag_types code)
10249 case typename_type:
10252 gcc_unreachable ();
10256 /* Name lookup in an elaborated-type-specifier (after the keyword
10257 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10258 elaborated-type-specifier is invalid, issue a diagnostic and return
10259 error_mark_node; otherwise, return the *_TYPE to which it referred.
10260 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10263 check_elaborated_type_specifier (enum tag_types tag_code,
10265 bool allow_template_p)
10271 struct S { struct S *p; };
10273 name lookup will find the TYPE_DECL for the implicit "S::S"
10274 typedef. Adjust for that here. */
10275 if (DECL_SELF_REFERENCE_P (decl))
10276 decl = TYPE_NAME (TREE_TYPE (decl));
10278 type = TREE_TYPE (decl);
10280 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10281 is false for this case as well. */
10282 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10284 error ("using template type parameter %qT after %qs",
10285 type, tag_name (tag_code));
10286 return error_mark_node;
10290 If the identifier resolves to a typedef-name or a template
10291 type-parameter, the elaborated-type-specifier is ill-formed.
10293 In other words, the only legitimate declaration to use in the
10294 elaborated type specifier is the implicit typedef created when
10295 the type is declared. */
10296 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10297 && tag_code != typename_type)
10299 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10300 error ("%q+D has a previous declaration here", decl);
10301 return error_mark_node;
10303 else if (TREE_CODE (type) != RECORD_TYPE
10304 && TREE_CODE (type) != UNION_TYPE
10305 && tag_code != enum_type
10306 && tag_code != typename_type)
10308 error ("%qT referred to as %qs", type, tag_name (tag_code));
10309 error ("%q+T has a previous declaration here", type);
10310 return error_mark_node;
10312 else if (TREE_CODE (type) != ENUMERAL_TYPE
10313 && tag_code == enum_type)
10315 error ("%qT referred to as enum", type);
10316 error ("%q+T has a previous declaration here", type);
10317 return error_mark_node;
10319 else if (!allow_template_p
10320 && TREE_CODE (type) == RECORD_TYPE
10321 && CLASSTYPE_IS_TEMPLATE (type))
10323 /* If a class template appears as elaborated type specifier
10324 without a template header such as:
10326 template <class T> class C {};
10327 void f(class C); // No template header here
10329 then the required template argument is missing. */
10330 error ("template argument required for %<%s %T%>",
10331 tag_name (tag_code),
10332 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10333 return error_mark_node;
10339 /* Lookup NAME in elaborate type specifier in scope according to
10340 SCOPE and issue diagnostics if necessary.
10341 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10342 found, and ERROR_MARK_NODE for type error. */
10345 lookup_and_check_tag (enum tag_types tag_code, tree name,
10346 tag_scope scope, bool template_header_p)
10350 if (scope == ts_global)
10352 /* First try ordinary name lookup, ignoring hidden class name
10353 injected via friend declaration. */
10354 decl = lookup_name_prefer_type (name, 2);
10355 /* If that fails, the name will be placed in the smallest
10356 non-class, non-function-prototype scope according to 3.3.1/5.
10357 We may already have a hidden name declared as friend in this
10358 scope. So lookup again but not ignoring hidden names.
10359 If we find one, that name will be made visible rather than
10360 creating a new tag. */
10362 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10365 decl = lookup_type_scope (name, scope);
10367 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10368 decl = DECL_TEMPLATE_RESULT (decl);
10370 if (decl && TREE_CODE (decl) == TYPE_DECL)
10372 /* Look for invalid nested type:
10376 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10378 error ("%qD has the same name as the class in which it is "
10381 return error_mark_node;
10384 /* Two cases we need to consider when deciding if a class
10385 template is allowed as an elaborated type specifier:
10386 1. It is a self reference to its own class.
10387 2. It comes with a template header.
10391 template <class T> class C {
10392 class C *c1; // DECL_SELF_REFERENCE_P is true
10395 template <class U> class C; // template_header_p is true
10396 template <class T> class C<T>::D {
10397 class C *c2; // DECL_SELF_REFERENCE_P is true
10400 t = check_elaborated_type_specifier (tag_code,
10403 | DECL_SELF_REFERENCE_P (decl));
10406 else if (decl && TREE_CODE (decl) == TREE_LIST)
10408 error ("reference to %qD is ambiguous", name);
10409 print_candidates (decl);
10410 return error_mark_node;
10416 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10417 Define the tag as a forward-reference if it is not defined.
10419 If a declaration is given, process it here, and report an error if
10420 multiple declarations are not identical.
10422 SCOPE is TS_CURRENT when this is also a definition. Only look in
10423 the current frame for the name (since C++ allows new names in any
10424 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10425 declaration. Only look beginning from the current scope outward up
10426 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10428 TEMPLATE_HEADER_P is true when this declaration is preceded by
10429 a set of template parameters. */
10432 xref_tag (enum tag_types tag_code, tree name,
10433 tag_scope scope, bool template_header_p)
10435 enum tree_code code;
10437 tree context = NULL_TREE;
10439 timevar_push (TV_NAME_LOOKUP);
10441 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10447 code = RECORD_TYPE;
10453 code = ENUMERAL_TYPE;
10456 gcc_unreachable ();
10459 /* In case of anonymous name, xref_tag is only called to
10460 make type node and push name. Name lookup is not required. */
10461 if (ANON_AGGRNAME_P (name))
10464 t = lookup_and_check_tag (tag_code, name,
10465 scope, template_header_p);
10467 if (t == error_mark_node)
10468 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10470 if (scope != ts_current && t && current_class_type
10471 && template_class_depth (current_class_type)
10472 && template_header_p)
10474 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10475 definition of this tag. Since, in addition, we are currently
10476 processing a (member) template declaration of a template
10477 class, we must be very careful; consider:
10484 { template <class V>
10485 friend struct S1; };
10487 Here, the S2::S1 declaration should not be confused with the
10488 outer declaration. In particular, the inner version should
10489 have a template parameter of level 2, not level 1. This
10490 would be particularly important if the member declaration
10493 template <class V = U> friend struct S1;
10495 say, when we should tsubst into `U' when instantiating
10496 S2. On the other hand, when presented with:
10506 we must find the inner binding eventually. We
10507 accomplish this by making sure that the new type we
10508 create to represent this declaration has the right
10510 context = TYPE_CONTEXT (t);
10516 /* If no such tag is yet defined, create a forward-reference node
10517 and record it as the "definition".
10518 When a real declaration of this type is found,
10519 the forward-reference will be altered into a real type. */
10520 if (code == ENUMERAL_TYPE)
10522 error ("use of enum %q#D without previous declaration", name);
10523 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10527 t = make_class_type (code);
10528 TYPE_CONTEXT (t) = context;
10529 t = pushtag (name, t, scope);
10534 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10536 if (!redeclare_class_template (t, current_template_parms))
10537 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10539 else if (!processing_template_decl
10540 && CLASS_TYPE_P (t)
10541 && CLASSTYPE_IS_TEMPLATE (t))
10543 error ("redeclaration of %qT as a non-template", t);
10544 error ("previous declaration %q+D", t);
10545 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10548 /* Make injected friend class visible. */
10549 if (scope != ts_within_enclosing_non_class
10550 && hidden_name_p (TYPE_NAME (t)))
10552 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10553 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10555 if (TYPE_TEMPLATE_INFO (t))
10557 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10558 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10563 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10567 xref_tag_from_type (tree old, tree id, tag_scope scope)
10569 enum tag_types tag_kind;
10571 if (TREE_CODE (old) == RECORD_TYPE)
10572 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10574 tag_kind = union_type;
10576 if (id == NULL_TREE)
10577 id = TYPE_IDENTIFIER (old);
10579 return xref_tag (tag_kind, id, scope, false);
10582 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10583 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10584 access_* node, and the TREE_VALUE is the type of the base-class.
10585 Non-NULL TREE_TYPE indicates virtual inheritance.
10587 Returns true if the binfo hierarchy was successfully created,
10588 false if an error was detected. */
10591 xref_basetypes (tree ref, tree base_list)
10594 tree binfo, base_binfo;
10595 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10596 unsigned max_bases = 0; /* Maximum direct bases. */
10598 tree default_access;
10599 tree igo_prev; /* Track Inheritance Graph Order. */
10601 if (ref == error_mark_node)
10604 /* The base of a derived class is private by default, all others are
10606 default_access = (TREE_CODE (ref) == RECORD_TYPE
10607 && CLASSTYPE_DECLARED_CLASS (ref)
10608 ? access_private_node : access_public_node);
10610 /* First, make sure that any templates in base-classes are
10611 instantiated. This ensures that if we call ourselves recursively
10612 we do not get confused about which classes are marked and which
10614 basep = &base_list;
10617 tree basetype = TREE_VALUE (*basep);
10619 if (!(processing_template_decl && uses_template_parms (basetype))
10620 && !complete_type_or_else (basetype, NULL))
10621 /* An incomplete type. Remove it from the list. */
10622 *basep = TREE_CHAIN (*basep);
10626 if (TREE_TYPE (*basep))
10628 if (CLASS_TYPE_P (basetype))
10629 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10630 basep = &TREE_CHAIN (*basep);
10634 TYPE_MARKED_P (ref) = 1;
10636 /* The binfo slot should be empty, unless this is an (ill-formed)
10638 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10639 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10641 binfo = make_tree_binfo (max_bases);
10643 TYPE_BINFO (ref) = binfo;
10644 BINFO_OFFSET (binfo) = size_zero_node;
10645 BINFO_TYPE (binfo) = ref;
10649 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10650 /* An aggregate cannot have baseclasses. */
10651 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10653 if (TREE_CODE (ref) == UNION_TYPE)
10655 error ("derived union %qT invalid", ref);
10662 if (TYPE_FOR_JAVA (ref))
10664 error ("Java class %qT cannot have multiple bases", ref);
10671 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10673 if (TYPE_FOR_JAVA (ref))
10675 error ("Java class %qT cannot have virtual bases", ref);
10680 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10682 tree access = TREE_PURPOSE (base_list);
10683 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10684 tree basetype = TREE_VALUE (base_list);
10686 if (access == access_default_node)
10687 access = default_access;
10689 if (PACK_EXPANSION_P (basetype))
10690 basetype = PACK_EXPANSION_PATTERN (basetype);
10691 if (TREE_CODE (basetype) == TYPE_DECL)
10692 basetype = TREE_TYPE (basetype);
10693 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10695 error ("base type %qT fails to be a struct or class type",
10700 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10701 TYPE_FOR_JAVA (ref) = 1;
10703 base_binfo = NULL_TREE;
10704 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10706 base_binfo = TYPE_BINFO (basetype);
10707 /* The original basetype could have been a typedef'd type. */
10708 basetype = BINFO_TYPE (base_binfo);
10710 /* Inherit flags from the base. */
10711 TYPE_HAS_NEW_OPERATOR (ref)
10712 |= TYPE_HAS_NEW_OPERATOR (basetype);
10713 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10714 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10715 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10716 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10717 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10718 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10719 CLASSTYPE_REPEATED_BASE_P (ref)
10720 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10723 /* We must do this test after we've seen through a typedef
10725 if (TYPE_MARKED_P (basetype))
10727 if (basetype == ref)
10728 error ("recursive type %qT undefined", basetype);
10730 error ("duplicate base type %qT invalid", basetype);
10734 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10735 /* Regenerate the pack expansion for the bases. */
10736 basetype = make_pack_expansion (basetype);
10738 TYPE_MARKED_P (basetype) = 1;
10740 base_binfo = copy_binfo (base_binfo, basetype, ref,
10741 &igo_prev, via_virtual);
10742 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10743 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10745 BINFO_BASE_APPEND (binfo, base_binfo);
10746 BINFO_BASE_ACCESS_APPEND (binfo, access);
10749 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10750 /* If we have space in the vbase vector, we must have shared at
10751 least one of them, and are therefore diamond shaped. */
10752 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10754 /* Unmark all the types. */
10755 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10756 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10757 TYPE_MARKED_P (ref) = 0;
10759 /* Now see if we have a repeated base type. */
10760 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10762 for (base_binfo = binfo; base_binfo;
10763 base_binfo = TREE_CHAIN (base_binfo))
10765 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10767 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10770 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10772 for (base_binfo = binfo; base_binfo;
10773 base_binfo = TREE_CHAIN (base_binfo))
10774 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10775 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10784 /* Begin compiling the definition of an enumeration type.
10787 UNDERLYING_TYPE is the type that will be used as the storage for
10788 the enumeration type. This should be NULL_TREE if no storage type
10791 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10793 Returns the type object, as yet incomplete.
10794 Also records info about it so that build_enumerator
10795 may be used to declare the individual values as they are read. */
10798 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10802 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10804 /* If this is the real definition for a previous forward reference,
10805 fill in the contents in the same object that used to be the
10806 forward reference. */
10808 enumtype = lookup_and_check_tag (enum_type, name,
10809 /*tag_scope=*/ts_current,
10810 /*template_header_p=*/false);
10812 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10814 error ("multiple definition of %q#T", enumtype);
10815 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10816 /* Clear out TYPE_VALUES, and start again. */
10817 TYPE_VALUES (enumtype) = NULL_TREE;
10821 /* In case of error, make a dummy enum to allow parsing to
10823 if (enumtype == error_mark_node)
10824 name = make_anon_name ();
10826 enumtype = make_node (ENUMERAL_TYPE);
10827 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10832 SET_SCOPED_ENUM_P (enumtype, 1);
10833 begin_scope (sk_scoped_enum, enumtype);
10835 /* [C++0x dcl.enum]p5:
10837 If not explicitly specified, the underlying type of a scoped
10838 enumeration type is int. */
10839 if (!underlying_type)
10840 underlying_type = integer_type_node;
10843 if (underlying_type)
10845 if (CP_INTEGRAL_TYPE_P (underlying_type))
10847 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10848 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10849 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10850 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10851 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10852 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10853 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10854 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10855 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10856 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10859 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10860 underlying_type, enumtype);
10866 /* After processing and defining all the values of an enumeration type,
10867 install their decls in the enumeration type and finish it off.
10868 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10871 finish_enum (tree enumtype)
10880 bool use_short_enum;
10884 integer_type_kind itk;
10885 tree underlying_type = NULL_TREE;
10886 bool fixed_underlying_type_p
10887 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
10889 /* We built up the VALUES in reverse order. */
10890 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10892 /* For an enum defined in a template, just set the type of the values;
10893 all further processing is postponed until the template is
10894 instantiated. We need to set the type so that tsubst of a CONST_DECL
10896 if (processing_template_decl)
10898 for (values = TYPE_VALUES (enumtype);
10900 values = TREE_CHAIN (values))
10901 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10902 if (at_function_scope_p ())
10903 add_stmt (build_min (TAG_DEFN, enumtype));
10907 /* Determine the minimum and maximum values of the enumerators. */
10908 if (TYPE_VALUES (enumtype))
10910 minnode = maxnode = NULL_TREE;
10912 for (values = TYPE_VALUES (enumtype);
10914 values = TREE_CHAIN (values))
10916 decl = TREE_VALUE (values);
10918 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10919 each enumerator has the type of its enumeration. Prior to the
10920 closing brace, the type of each enumerator is the type of its
10921 initializing value. */
10922 TREE_TYPE (decl) = enumtype;
10924 /* Update the minimum and maximum values, if appropriate. */
10925 value = DECL_INITIAL (decl);
10926 if (value == error_mark_node)
10927 value = integer_zero_node;
10928 /* Figure out what the minimum and maximum values of the
10929 enumerators are. */
10931 minnode = maxnode = value;
10932 else if (tree_int_cst_lt (maxnode, value))
10934 else if (tree_int_cst_lt (value, minnode))
10941 If the enumerator-list is empty, the underlying type is as if
10942 the enumeration had a single enumerator with value 0. */
10943 minnode = maxnode = integer_zero_node;
10945 /* Compute the number of bits require to represent all values of the
10946 enumeration. We must do this before the type of MINNODE and
10947 MAXNODE are transformed, since min_precision relies on the
10948 TREE_TYPE of the value it is passed. */
10949 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10950 lowprec = min_precision (minnode, unsignedp);
10951 highprec = min_precision (maxnode, unsignedp);
10952 precision = MAX (lowprec, highprec);
10954 if (!fixed_underlying_type_p)
10956 /* Determine the underlying type of the enumeration.
10960 The underlying type of an enumeration is an integral type that
10961 can represent all the enumerator values defined in the
10962 enumeration. It is implementation-defined which integral type is
10963 used as the underlying type for an enumeration except that the
10964 underlying type shall not be larger than int unless the value of
10965 an enumerator cannot fit in an int or unsigned int.
10967 We use "int" or an "unsigned int" as the underlying type, even if
10968 a smaller integral type would work, unless the user has
10969 explicitly requested that we use the smallest possible type. The
10970 user can request that for all enumerations with a command line
10971 flag, or for just one enumeration with an attribute. */
10973 use_short_enum = flag_short_enums
10974 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10976 for (itk = (use_short_enum ? itk_char : itk_int);
10980 underlying_type = integer_types[itk];
10981 if (TYPE_PRECISION (underlying_type) >= precision
10982 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10985 if (itk == itk_none)
10989 IF no integral type can represent all the enumerator values, the
10990 enumeration is ill-formed. */
10991 error ("no integral type can represent all of the enumerator values "
10992 "for %qT", enumtype);
10993 precision = TYPE_PRECISION (long_long_integer_type_node);
10994 underlying_type = integer_types[itk_unsigned_long_long];
10999 The value of sizeof() applied to an enumeration type, an object
11000 of an enumeration type, or an enumerator, is the value of sizeof()
11001 applied to the underlying type. */
11002 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11003 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11004 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
11005 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11006 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11007 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11009 /* Set the underlying type of the enumeration type to the
11010 computed enumeration type, restricted to the enumerator
11012 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
11013 set_min_and_max_values_for_integral_type
11014 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11017 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11019 /* Compute the minimum and maximum values for the type.
11023 For an enumeration where emin is the smallest enumerator and emax
11024 is the largest, the values of the enumeration are the values of the
11025 underlying type in the range bmin to bmax, where bmin and bmax are,
11026 respectively, the smallest and largest values of the smallest bit-
11027 field that can store emin and emax. */
11029 /* The middle-end currently assumes that types with TYPE_PRECISION
11030 narrower than their underlying type are suitably zero or sign
11031 extended to fill their mode. g++ doesn't make these guarantees.
11032 Until the middle-end can represent such paradoxical types, we
11033 set the TYPE_PRECISION to the width of the underlying type. */
11034 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11036 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11038 /* Convert each of the enumerators to the type of the underlying
11039 type of the enumeration. */
11040 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11042 location_t saved_location;
11044 decl = TREE_VALUE (values);
11045 saved_location = input_location;
11046 input_location = DECL_SOURCE_LOCATION (decl);
11047 if (fixed_underlying_type_p)
11048 /* If the enumeration type has a fixed underlying type, we
11049 already checked all of the enumerator values. */
11050 value = DECL_INITIAL (decl);
11052 value = perform_implicit_conversion (underlying_type,
11053 DECL_INITIAL (decl),
11054 tf_warning_or_error);
11055 input_location = saved_location;
11057 /* Do not clobber shared ints. */
11058 value = copy_node (value);
11060 TREE_TYPE (value) = enumtype;
11061 DECL_INITIAL (decl) = value;
11064 /* Fix up all variant types of this enum type. */
11065 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11067 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11068 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11069 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11070 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11071 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11072 TYPE_MODE (t) = TYPE_MODE (enumtype);
11073 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11074 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11075 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11076 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11077 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11080 /* Finish up the scope of a scoped enumeration. */
11081 if (SCOPED_ENUM_P (enumtype))
11084 /* Finish debugging output for this type. */
11085 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11088 /* Build and install a CONST_DECL for an enumeration constant of the
11089 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11090 Assignment of sequential values by default is handled here. */
11093 build_enumerator (tree name, tree value, tree enumtype)
11099 /* If the VALUE was erroneous, pretend it wasn't there; that will
11100 result in the enum being assigned the next value in sequence. */
11101 if (value == error_mark_node)
11104 /* Remove no-op casts from the value. */
11106 STRIP_TYPE_NOPS (value);
11108 if (! processing_template_decl)
11110 /* Validate and default VALUE. */
11111 if (value != NULL_TREE)
11113 value = integral_constant_value (value);
11115 if (TREE_CODE (value) == INTEGER_CST)
11117 value = perform_integral_promotions (value);
11118 constant_expression_warning (value);
11122 error ("enumerator value for %qD is not an integer constant", name);
11127 /* Default based on previous value. */
11128 if (value == NULL_TREE)
11130 if (TYPE_VALUES (enumtype))
11133 unsigned HOST_WIDE_INT lo;
11137 /* The next value is the previous value plus one. We can
11138 safely assume that the previous value is an INTEGER_CST.
11139 add_double doesn't know the type of the target expression,
11140 so we must check with int_fits_type_p as well. */
11141 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11142 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11143 TREE_INT_CST_HIGH (prev_value),
11145 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11146 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11150 error ("overflow in enumeration values at %qD", name);
11151 value = error_mark_node;
11155 value = integer_zero_node;
11158 /* Remove no-op casts from the value. */
11159 STRIP_TYPE_NOPS (value);
11161 /* If the underlying type of the enum is fixed, check whether
11162 the enumerator values fits in the underlying type. If it
11163 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11164 if (ENUM_UNDERLYING_TYPE (enumtype)
11166 && TREE_CODE (value) == INTEGER_CST
11167 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11169 error ("enumerator value %E is too large for underlying type %<%T%>",
11170 value, ENUM_UNDERLYING_TYPE (enumtype));
11172 /* Silently convert the value so that we can continue. */
11173 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11175 if (value == error_mark_node)
11180 /* C++ associates enums with global, function, or class declarations. */
11181 context = current_scope ();
11183 /* Build the actual enumeration constant. Note that the enumeration
11184 constants have the underlying type of the enum (if it is fixed)
11185 or the type of their initializer (if the underlying type of the
11186 enum is not fixed):
11190 If the underlying type is fixed, the type of each enumerator
11191 prior to the closing brace is the underlying type; if the
11192 initializing value of an enumerator cannot be represented by
11193 the underlying type, the program is ill-formed. If the
11194 underlying type is not fixed, the type of each enumerator is
11195 the type of its initializing value.
11197 If the underlying type is not fixed, it will be computed by
11198 finish_enum and we will reset the type of this enumerator. Of
11199 course, if we're processing a template, there may be no value. */
11200 type = value ? TREE_TYPE (value) : NULL_TREE;
11202 if (context && context == current_class_type)
11203 /* This enum declaration is local to the class. We need the full
11204 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11205 decl = build_lang_decl (CONST_DECL, name, type);
11207 /* It's a global enum, or it's local to a function. (Note local to
11208 a function could mean local to a class method. */
11209 decl = build_decl (CONST_DECL, name, type);
11211 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11212 TREE_CONSTANT (decl) = 1;
11213 TREE_READONLY (decl) = 1;
11214 DECL_INITIAL (decl) = value;
11216 if (context && context == current_class_type)
11217 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11218 on the TYPE_FIELDS list for `S'. (That's so that you can say
11219 things like `S::i' later.) */
11220 finish_member_declaration (decl);
11224 /* Add this enumeration constant to the list for this type. */
11225 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11228 /* Look for an enumerator with the given NAME within the enumeration
11229 type ENUMTYPE. This routine is used primarily for qualified name
11230 lookup into an enumerator in C++0x, e.g.,
11232 enum class Color { Red, Green, Blue };
11234 Color color = Color::Red;
11236 Returns the value corresponding to the enumerator, or
11237 NULL_TREE if no such enumerator was found. */
11239 lookup_enumerator (tree enumtype, tree name)
11242 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11244 e = purpose_member (name, TYPE_VALUES (enumtype));
11245 return e? TREE_VALUE (e) : NULL_TREE;
11249 /* We're defining DECL. Make sure that it's type is OK. */
11252 check_function_type (tree decl, tree current_function_parms)
11254 tree fntype = TREE_TYPE (decl);
11255 tree return_type = complete_type (TREE_TYPE (fntype));
11257 /* In a function definition, arg types must be complete. */
11258 require_complete_types_for_parms (current_function_parms);
11260 if (dependent_type_p (return_type))
11262 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11263 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11265 tree args = TYPE_ARG_TYPES (fntype);
11267 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11268 error ("return type %q#T is incomplete", return_type);
11270 error ("return type has Java class type %q#T", return_type);
11272 /* Make it return void instead. */
11273 if (TREE_CODE (fntype) == METHOD_TYPE)
11274 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11276 TREE_CHAIN (args));
11278 fntype = build_function_type (void_type_node, args);
11280 = build_exception_variant (fntype,
11281 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11284 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11287 /* Create the FUNCTION_DECL for a function definition.
11288 DECLSPECS and DECLARATOR are the parts of the declaration;
11289 they describe the function's name and the type it returns,
11290 but twisted together in a fashion that parallels the syntax of C.
11292 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11293 DECLARATOR is really the DECL for the function we are about to
11294 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11295 indicating that the function is an inline defined in-class.
11297 This function creates a binding context for the function body
11298 as well as setting up the FUNCTION_DECL in current_function_decl.
11300 For C++, we must first check whether that datum makes any sense.
11301 For example, "class A local_a(1,2);" means that variable local_a
11302 is an aggregate of type A, which should have a constructor
11303 applied to it with the argument list [1, 2].
11305 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11306 or may be a BLOCK if the function has been defined previously
11307 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11308 error_mark_node if the function has never been defined, or
11309 a BLOCK if the function has been defined somewhere. */
11312 start_preparsed_function (tree decl1, tree attrs, int flags)
11314 tree ctype = NULL_TREE;
11317 int doing_friend = 0;
11318 struct cp_binding_level *bl;
11319 tree current_function_parms;
11320 struct c_fileinfo *finfo
11321 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11322 bool honor_interface;
11324 /* Sanity check. */
11325 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11326 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11328 fntype = TREE_TYPE (decl1);
11329 if (TREE_CODE (fntype) == METHOD_TYPE)
11330 ctype = TYPE_METHOD_BASETYPE (fntype);
11332 /* ISO C++ 11.4/5. A friend function defined in a class is in
11333 the (lexical) scope of the class in which it is defined. */
11334 if (!ctype && DECL_FRIEND_P (decl1))
11336 ctype = DECL_FRIEND_CONTEXT (decl1);
11338 /* CTYPE could be null here if we're dealing with a template;
11339 for example, `inline friend float foo()' inside a template
11340 will have no CTYPE set. */
11341 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11347 if (DECL_DECLARED_INLINE_P (decl1)
11348 && lookup_attribute ("noinline", attrs))
11349 warning (0, "inline function %q+D given attribute noinline", decl1);
11351 /* Handle gnu_inline attribute. */
11352 if (GNU_INLINE_P (decl1))
11354 DECL_EXTERNAL (decl1) = 1;
11355 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11356 DECL_INTERFACE_KNOWN (decl1) = 1;
11357 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11360 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11361 /* This is a constructor, we must ensure that any default args
11362 introduced by this definition are propagated to the clones
11363 now. The clones are used directly in overload resolution. */
11364 adjust_clone_args (decl1);
11366 /* Sometimes we don't notice that a function is a static member, and
11367 build a METHOD_TYPE for it. Fix that up now. */
11368 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11369 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11371 revert_static_member_fn (decl1);
11375 /* Set up current_class_type, and enter the scope of the class, if
11378 push_nested_class (ctype);
11379 else if (DECL_STATIC_FUNCTION_P (decl1))
11380 push_nested_class (DECL_CONTEXT (decl1));
11382 /* Now that we have entered the scope of the class, we must restore
11383 the bindings for any template parameters surrounding DECL1, if it
11384 is an inline member template. (Order is important; consider the
11385 case where a template parameter has the same name as a field of
11386 the class.) It is not until after this point that
11387 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11388 if (flags & SF_INCLASS_INLINE)
11389 maybe_begin_member_template_processing (decl1);
11391 /* Effective C++ rule 15. */
11393 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11394 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11395 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11397 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11398 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11399 if (!DECL_INITIAL (decl1))
11400 DECL_INITIAL (decl1) = error_mark_node;
11402 /* This function exists in static storage.
11403 (This does not mean `static' in the C sense!) */
11404 TREE_STATIC (decl1) = 1;
11406 /* We must call push_template_decl after current_class_type is set
11407 up. (If we are processing inline definitions after exiting a
11408 class scope, current_class_type will be NULL_TREE until set above
11409 by push_nested_class.) */
11410 if (processing_template_decl)
11412 /* FIXME: Handle error_mark_node more gracefully. */
11413 tree newdecl1 = push_template_decl (decl1);
11414 if (newdecl1 != error_mark_node)
11418 /* We are now in the scope of the function being defined. */
11419 current_function_decl = decl1;
11421 /* Save the parm names or decls from this function's declarator
11422 where store_parm_decls will find them. */
11423 current_function_parms = DECL_ARGUMENTS (decl1);
11425 /* Make sure the parameter and return types are reasonable. When
11426 you declare a function, these types can be incomplete, but they
11427 must be complete when you define the function. */
11428 check_function_type (decl1, current_function_parms);
11430 /* Build the return declaration for the function. */
11431 restype = TREE_TYPE (fntype);
11432 if (DECL_RESULT (decl1) == NULL_TREE)
11436 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11437 DECL_ARTIFICIAL (resdecl) = 1;
11438 DECL_IGNORED_P (resdecl) = 1;
11439 DECL_RESULT (decl1) = resdecl;
11441 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11444 /* Let the user know we're compiling this function. */
11445 announce_function (decl1);
11447 /* Record the decl so that the function name is defined.
11448 If we already have a decl for this name, and it is a FUNCTION_DECL,
11449 use the old decl. */
11450 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11452 /* A specialization is not used to guide overload resolution. */
11453 if (!DECL_FUNCTION_MEMBER_P (decl1)
11454 && !(DECL_USE_TEMPLATE (decl1) &&
11455 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11457 tree olddecl = pushdecl (decl1);
11459 if (olddecl == error_mark_node)
11460 /* If something went wrong when registering the declaration,
11461 use DECL1; we have to have a FUNCTION_DECL to use when
11462 parsing the body of the function. */
11466 /* Otherwise, OLDDECL is either a previous declaration
11467 of the same function or DECL1 itself. */
11469 if (warn_missing_declarations
11470 && olddecl == decl1
11471 && !DECL_MAIN_P (decl1)
11472 && TREE_PUBLIC (decl1)
11473 && !DECL_DECLARED_INLINE_P (decl1))
11477 /* Check whether DECL1 is in an anonymous
11479 for (context = DECL_CONTEXT (decl1);
11481 context = DECL_CONTEXT (context))
11483 if (TREE_CODE (context) == NAMESPACE_DECL
11484 && DECL_NAME (context) == NULL_TREE)
11488 if (context == NULL)
11489 warning (OPT_Wmissing_declarations,
11490 "no previous declaration for %q+D", decl1);
11498 /* We need to set the DECL_CONTEXT. */
11499 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11500 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11502 fntype = TREE_TYPE (decl1);
11504 /* If #pragma weak applies, mark the decl appropriately now.
11505 The pragma only applies to global functions. Because
11506 determining whether or not the #pragma applies involves
11507 computing the mangled name for the declaration, we cannot
11508 apply the pragma until after we have merged this declaration
11509 with any previous declarations; if the original declaration
11510 has a linkage specification, that specification applies to
11511 the definition as well, and may affect the mangled name. */
11512 if (!DECL_CONTEXT (decl1))
11513 maybe_apply_pragma_weak (decl1);
11516 /* Reset this in case the call to pushdecl changed it. */
11517 current_function_decl = decl1;
11519 gcc_assert (DECL_INITIAL (decl1));
11521 /* This function may already have been parsed, in which case just
11522 return; our caller will skip over the body without parsing. */
11523 if (DECL_INITIAL (decl1) != error_mark_node)
11526 /* Initialize RTL machinery. We cannot do this until
11527 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11528 even when processing a template; this is how we get
11529 CFUN set up, and our per-function variables initialized.
11530 FIXME factor out the non-RTL stuff. */
11531 bl = current_binding_level;
11532 allocate_struct_function (decl1, processing_template_decl);
11534 /* Initialize the language data structures. Whenever we start
11535 a new function, we destroy temporaries in the usual way. */
11536 cfun->language = GGC_CNEW (struct language_function);
11537 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11538 current_binding_level = bl;
11540 /* Even though we're inside a function body, we still don't want to
11541 call expand_expr to calculate the size of a variable-sized array.
11542 We haven't necessarily assigned RTL to all variables yet, so it's
11543 not safe to try to expand expressions involving them. */
11544 cfun->dont_save_pending_sizes_p = 1;
11546 /* Start the statement-tree, start the tree now. */
11547 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11549 /* If we are (erroneously) defining a function that we have already
11550 defined before, wipe out what we knew before. */
11551 if (!DECL_PENDING_INLINE_P (decl1))
11552 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11554 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11556 /* We know that this was set up by `grokclassfn'. We do not
11557 wait until `store_parm_decls', since evil parse errors may
11558 never get us to that point. Here we keep the consistency
11559 between `current_class_type' and `current_class_ptr'. */
11560 tree t = DECL_ARGUMENTS (decl1);
11562 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11563 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11565 cp_function_chain->x_current_class_ref
11566 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11567 cp_function_chain->x_current_class_ptr = t;
11569 /* Constructors and destructors need to know whether they're "in
11570 charge" of initializing virtual base classes. */
11571 t = TREE_CHAIN (t);
11572 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11574 current_in_charge_parm = t;
11575 t = TREE_CHAIN (t);
11577 if (DECL_HAS_VTT_PARM_P (decl1))
11579 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11580 current_vtt_parm = t;
11584 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11585 /* Implicitly-defined methods (like the
11586 destructor for a class in which no destructor
11587 is explicitly declared) must not be defined
11588 until their definition is needed. So, we
11589 ignore interface specifications for
11590 compiler-generated functions. */
11591 && !DECL_ARTIFICIAL (decl1));
11593 if (DECL_INTERFACE_KNOWN (decl1))
11595 tree ctx = decl_function_context (decl1);
11597 if (DECL_NOT_REALLY_EXTERN (decl1))
11598 DECL_EXTERNAL (decl1) = 0;
11600 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11601 && TREE_PUBLIC (ctx))
11602 /* This is a function in a local class in an extern inline
11604 comdat_linkage (decl1);
11606 /* If this function belongs to an interface, it is public.
11607 If it belongs to someone else's interface, it is also external.
11608 This only affects inlines and template instantiations. */
11609 else if (!finfo->interface_unknown && honor_interface)
11611 if (DECL_DECLARED_INLINE_P (decl1)
11612 || DECL_TEMPLATE_INSTANTIATION (decl1)
11613 || processing_template_decl)
11615 DECL_EXTERNAL (decl1)
11616 = (finfo->interface_only
11617 || (DECL_DECLARED_INLINE_P (decl1)
11618 && ! flag_implement_inlines
11619 && !DECL_VINDEX (decl1)));
11621 /* For WIN32 we also want to put these in linkonce sections. */
11622 maybe_make_one_only (decl1);
11625 DECL_EXTERNAL (decl1) = 0;
11626 DECL_INTERFACE_KNOWN (decl1) = 1;
11627 /* If this function is in an interface implemented in this file,
11628 make sure that the back end knows to emit this function
11630 if (!DECL_EXTERNAL (decl1))
11631 mark_needed (decl1);
11633 else if (finfo->interface_unknown && finfo->interface_only
11634 && honor_interface)
11636 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11637 interface, we will have both finfo->interface_unknown and
11638 finfo->interface_only set. In that case, we don't want to
11639 use the normal heuristics because someone will supply a
11640 #pragma implementation elsewhere, and deducing it here would
11641 produce a conflict. */
11642 comdat_linkage (decl1);
11643 DECL_EXTERNAL (decl1) = 0;
11644 DECL_INTERFACE_KNOWN (decl1) = 1;
11645 DECL_DEFER_OUTPUT (decl1) = 1;
11649 /* This is a definition, not a reference.
11650 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11651 if (!GNU_INLINE_P (decl1))
11652 DECL_EXTERNAL (decl1) = 0;
11654 if ((DECL_DECLARED_INLINE_P (decl1)
11655 || DECL_TEMPLATE_INSTANTIATION (decl1))
11656 && ! DECL_INTERFACE_KNOWN (decl1)
11657 /* Don't try to defer nested functions for now. */
11658 && ! decl_function_context (decl1))
11659 DECL_DEFER_OUTPUT (decl1) = 1;
11661 DECL_INTERFACE_KNOWN (decl1) = 1;
11664 /* Determine the ELF visibility attribute for the function. We must not
11665 do this before calling "pushdecl", as we must allow "duplicate_decls"
11666 to merge any attributes appropriately. We also need to wait until
11668 if (!DECL_CLONED_FUNCTION_P (decl1))
11669 determine_visibility (decl1);
11671 begin_scope (sk_function_parms, decl1);
11675 if (DECL_DESTRUCTOR_P (decl1)
11676 || (DECL_CONSTRUCTOR_P (decl1)
11677 && targetm.cxx.cdtor_returns_this ()))
11679 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11680 DECL_CONTEXT (cdtor_label) = current_function_decl;
11683 start_fname_decls ();
11685 store_parm_decls (current_function_parms);
11689 /* Like start_preparsed_function, except that instead of a
11690 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11692 Returns 1 on success. If the DECLARATOR is not suitable for a function
11693 (it defines a datum instead), we return 0, which tells
11694 yyparse to report a parse error. */
11697 start_function (cp_decl_specifier_seq *declspecs,
11698 const cp_declarator *declarator,
11703 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11704 /* If the declarator is not suitable for a function definition,
11705 cause a syntax error. */
11706 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11709 if (DECL_MAIN_P (decl1))
11710 /* main must return int. grokfndecl should have corrected it
11711 (and issued a diagnostic) if the user got it wrong. */
11712 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11713 integer_type_node));
11715 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11720 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11724 use_eh_spec_block (tree fn)
11726 return (flag_exceptions && flag_enforce_eh_specs
11727 && !processing_template_decl
11728 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11729 /* We insert the EH_SPEC_BLOCK only in the original
11730 function; then, it is copied automatically to the
11732 && !DECL_CLONED_FUNCTION_P (fn)
11733 /* Implicitly-generated constructors and destructors have
11734 exception specifications. However, those specifications
11735 are the union of the possible exceptions specified by the
11736 constructors/destructors for bases and members, so no
11737 unallowed exception will ever reach this function. By
11738 not creating the EH_SPEC_BLOCK we save a little memory,
11739 and we avoid spurious warnings about unreachable
11741 && !DECL_ARTIFICIAL (fn));
11744 /* Store the parameter declarations into the current function declaration.
11745 This is called after parsing the parameter declarations, before
11746 digesting the body of the function.
11748 Also install to binding contour return value identifier, if any. */
11751 store_parm_decls (tree current_function_parms)
11753 tree fndecl = current_function_decl;
11756 /* This is a chain of any other decls that came in among the parm
11757 declarations. If a parm is declared with enum {foo, bar} x;
11758 then CONST_DECLs for foo and bar are put here. */
11759 tree nonparms = NULL_TREE;
11761 if (current_function_parms)
11763 /* This case is when the function was defined with an ANSI prototype.
11764 The parms already have decls, so we need not do anything here
11765 except record them as in effect
11766 and complain if any redundant old-style parm decls were written. */
11768 tree specparms = current_function_parms;
11771 /* Must clear this because it might contain TYPE_DECLs declared
11773 current_binding_level->names = NULL;
11775 /* If we're doing semantic analysis, then we'll call pushdecl
11776 for each of these. We must do them in reverse order so that
11777 they end in the correct forward order. */
11778 specparms = nreverse (specparms);
11780 for (parm = specparms; parm; parm = next)
11782 next = TREE_CHAIN (parm);
11783 if (TREE_CODE (parm) == PARM_DECL)
11785 if (DECL_NAME (parm) == NULL_TREE
11786 || TREE_CODE (parm) != VOID_TYPE)
11789 error ("parameter %qD declared void", parm);
11793 /* If we find an enum constant or a type tag,
11794 put it aside for the moment. */
11795 TREE_CHAIN (parm) = NULL_TREE;
11796 nonparms = chainon (nonparms, parm);
11800 /* Get the decls in their original chain order and record in the
11801 function. This is all and only the PARM_DECLs that were
11802 pushed into scope by the loop above. */
11803 DECL_ARGUMENTS (fndecl) = getdecls ();
11806 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11808 /* Now store the final chain of decls for the arguments
11809 as the decl-chain of the current lexical scope.
11810 Put the enumerators in as well, at the front so that
11811 DECL_ARGUMENTS is not modified. */
11812 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11814 if (use_eh_spec_block (current_function_decl))
11815 current_eh_spec_block = begin_eh_spec_block ();
11819 /* We have finished doing semantic analysis on DECL, but have not yet
11820 generated RTL for its body. Save away our current state, so that
11821 when we want to generate RTL later we know what to do. */
11824 save_function_data (tree decl)
11826 struct language_function *f;
11828 /* Save the language-specific per-function data so that we can
11829 get it back when we really expand this function. */
11830 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11833 f = GGC_NEW (struct language_function);
11834 memcpy (f, cp_function_chain, sizeof (struct language_function));
11835 DECL_SAVED_FUNCTION_DATA (decl) = f;
11837 /* Clear out the bits we don't need. */
11838 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11839 f->bindings = NULL;
11840 f->x_local_names = NULL;
11844 /* Set the return value of the constructor (if present). */
11847 finish_constructor_body (void)
11852 if (targetm.cxx.cdtor_returns_this ()
11853 && (! TYPE_FOR_JAVA (current_class_type)))
11855 /* Any return from a constructor will end up here. */
11856 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11858 val = DECL_ARGUMENTS (current_function_decl);
11859 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11860 DECL_RESULT (current_function_decl), val);
11861 /* Return the address of the object. */
11862 exprstmt = build_stmt (RETURN_EXPR, val);
11863 add_stmt (exprstmt);
11867 /* Do all the processing for the beginning of a destructor; set up the
11868 vtable pointers and cleanups for bases and members. */
11871 begin_destructor_body (void)
11873 tree compound_stmt;
11875 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11876 issued an error message. We still want to try to process the
11877 body of the function, but initialize_vtbl_ptrs will crash if
11878 TYPE_BINFO is NULL. */
11879 if (COMPLETE_TYPE_P (current_class_type))
11881 compound_stmt = begin_compound_stmt (0);
11882 /* Make all virtual function table pointers in non-virtual base
11883 classes point to CURRENT_CLASS_TYPE's virtual function
11885 initialize_vtbl_ptrs (current_class_ptr);
11886 finish_compound_stmt (compound_stmt);
11888 /* And insert cleanups for our bases and members so that they
11889 will be properly destroyed if we throw. */
11890 push_base_cleanups ();
11894 /* At the end of every destructor we generate code to delete the object if
11895 necessary. Do that now. */
11898 finish_destructor_body (void)
11902 /* Any return from a destructor will end up here; that way all base
11903 and member cleanups will be run when the function returns. */
11904 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11906 /* In a virtual destructor, we must call delete. */
11907 if (DECL_VIRTUAL_P (current_function_decl))
11910 tree virtual_size = cxx_sizeof (current_class_type);
11914 At the point of definition of a virtual destructor (including
11915 an implicit definition), non-placement operator delete shall
11916 be looked up in the scope of the destructor's class and if
11917 found shall be accessible and unambiguous. */
11918 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11920 /*global_p=*/false,
11921 /*placement=*/NULL_TREE,
11922 /*alloc_fn=*/NULL_TREE);
11924 if_stmt = begin_if_stmt ();
11925 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11926 current_in_charge_parm,
11929 finish_expr_stmt (exprstmt);
11930 finish_then_clause (if_stmt);
11931 finish_if_stmt (if_stmt);
11934 if (targetm.cxx.cdtor_returns_this ())
11938 val = DECL_ARGUMENTS (current_function_decl);
11939 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11940 DECL_RESULT (current_function_decl), val);
11941 /* Return the address of the object. */
11942 exprstmt = build_stmt (RETURN_EXPR, val);
11943 add_stmt (exprstmt);
11947 /* Do the necessary processing for the beginning of a function body, which
11948 in this case includes member-initializers, but not the catch clauses of
11949 a function-try-block. Currently, this means opening a binding level
11950 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11953 begin_function_body (void)
11957 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11960 if (processing_template_decl)
11961 /* Do nothing now. */;
11963 /* Always keep the BLOCK node associated with the outermost pair of
11964 curly braces of a function. These are needed for correct
11965 operation of dwarfout.c. */
11966 keep_next_level (true);
11968 stmt = begin_compound_stmt (BCS_FN_BODY);
11970 if (processing_template_decl)
11971 /* Do nothing now. */;
11972 else if (DECL_DESTRUCTOR_P (current_function_decl))
11973 begin_destructor_body ();
11978 /* Do the processing for the end of a function body. Currently, this means
11979 closing out the cleanups for fully-constructed bases and members, and in
11980 the case of the destructor, deleting the object if desired. Again, this
11981 is only meaningful for [cd]tors, since they are the only functions where
11982 there is a significant distinction between the main body and any
11983 function catch clauses. Handling, say, main() return semantics here
11984 would be wrong, as flowing off the end of a function catch clause for
11985 main() would also need to return 0. */
11988 finish_function_body (tree compstmt)
11990 if (compstmt == NULL_TREE)
11993 /* Close the block. */
11994 finish_compound_stmt (compstmt);
11996 if (processing_template_decl)
11997 /* Do nothing now. */;
11998 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11999 finish_constructor_body ();
12000 else if (DECL_DESTRUCTOR_P (current_function_decl))
12001 finish_destructor_body ();
12004 /* Given a function, returns the BLOCK corresponding to the outermost level
12005 of curly braces, skipping the artificial block created for constructor
12009 outer_curly_brace_block (tree fndecl)
12011 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12012 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12013 /* Skip the artificial function body block. */
12014 block = BLOCK_SUBBLOCKS (block);
12018 /* Finish up a function declaration and compile that function
12019 all the way to assembler language output. The free the storage
12020 for the function definition.
12022 FLAGS is a bitwise or of the following values:
12024 We just finished processing the body of an in-class inline
12025 function definition. (This processing will have taken place
12026 after the class definition is complete.) */
12029 finish_function (int flags)
12031 tree fndecl = current_function_decl;
12032 tree fntype, ctype = NULL_TREE;
12033 int inclass_inline = (flags & 2) != 0;
12036 /* When we get some parse errors, we can end up without a
12037 current_function_decl, so cope. */
12038 if (fndecl == NULL_TREE)
12039 return error_mark_node;
12041 gcc_assert (!defer_mark_used_calls);
12042 defer_mark_used_calls = true;
12044 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12045 && DECL_VIRTUAL_P (fndecl)
12046 && !processing_template_decl)
12048 tree fnclass = DECL_CONTEXT (fndecl);
12049 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12050 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12053 nested = function_depth > 1;
12054 fntype = TREE_TYPE (fndecl);
12056 /* TREE_READONLY (fndecl) = 1;
12057 This caused &foo to be of type ptr-to-const-function
12058 which then got a warning when stored in a ptr-to-function variable. */
12060 gcc_assert (building_stmt_tree ());
12061 /* The current function is being defined, so its DECL_INITIAL should
12062 be set, and unless there's a multiple definition, it should be
12063 error_mark_node. */
12064 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12066 /* For a cloned function, we've already got all the code we need;
12067 there's no need to add any extra bits. */
12068 if (!DECL_CLONED_FUNCTION_P (fndecl))
12070 if (DECL_MAIN_P (current_function_decl))
12074 /* Make it so that `main' always returns 0 by default (or
12077 stmt = finish_return_stmt (integer_one_node);
12079 stmt = finish_return_stmt (integer_zero_node);
12081 /* Hack. We don't want the middle-end to warn that this
12082 return is unreachable, so put the statement on the
12085 location_t linezero = linemap_line_start (line_table, 0, 1);
12086 SET_EXPR_LOCATION (stmt, linezero);
12090 if (use_eh_spec_block (current_function_decl))
12091 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12092 (TREE_TYPE (current_function_decl)),
12093 current_eh_spec_block);
12096 /* If we're saving up tree structure, tie off the function now. */
12097 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12099 finish_fname_decls ();
12101 /* If this function can't throw any exceptions, remember that. */
12102 if (!processing_template_decl
12103 && !cp_function_chain->can_throw
12104 && !flag_non_call_exceptions
12105 && !DECL_REPLACEABLE_P (fndecl))
12106 TREE_NOTHROW (fndecl) = 1;
12108 /* This must come after expand_function_end because cleanups might
12109 have declarations (from inline functions) that need to go into
12110 this function's blocks. */
12112 /* If the current binding level isn't the outermost binding level
12113 for this function, either there is a bug, or we have experienced
12114 syntax errors and the statement tree is malformed. */
12115 if (current_binding_level->kind != sk_function_parms)
12117 /* Make sure we have already experienced errors. */
12118 gcc_assert (errorcount);
12120 /* Throw away the broken statement tree and extra binding
12122 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12124 while (current_binding_level->kind != sk_function_parms)
12126 if (current_binding_level->kind == sk_class)
12127 pop_nested_class ();
12129 poplevel (0, 0, 0);
12132 poplevel (1, 0, 1);
12134 /* Statements should always be full-expressions at the outermost set
12135 of curly braces for a function. */
12136 gcc_assert (stmts_are_full_exprs_p ());
12138 /* Set up the named return value optimization, if we can. Candidate
12139 variables are selected in check_return_expr. */
12140 if (current_function_return_value)
12142 tree r = current_function_return_value;
12145 if (r != error_mark_node
12146 /* This is only worth doing for fns that return in memory--and
12147 simpler, since we don't have to worry about promoted modes. */
12148 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12149 /* Only allow this for variables declared in the outer scope of
12150 the function so we know that their lifetime always ends with a
12151 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12152 we were to do this optimization in tree-ssa. */
12153 && (outer = outer_curly_brace_block (fndecl))
12154 && chain_member (r, BLOCK_VARS (outer)))
12155 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12157 current_function_return_value = NULL_TREE;
12160 /* Remember that we were in class scope. */
12161 if (current_class_name)
12162 ctype = current_class_type;
12164 /* Must mark the RESULT_DECL as being in this function. */
12165 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12167 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12168 to the FUNCTION_DECL node itself. */
12169 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12171 /* Save away current state, if appropriate. */
12172 if (!processing_template_decl)
12173 save_function_data (fndecl);
12175 /* Complain if there's just no return statement. */
12176 if (warn_return_type
12177 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12178 && !dependent_type_p (TREE_TYPE (fntype))
12179 && !current_function_returns_value && !current_function_returns_null
12180 /* Don't complain if we abort or throw. */
12181 && !current_function_returns_abnormally
12182 && !DECL_NAME (DECL_RESULT (fndecl))
12183 && !TREE_NO_WARNING (fndecl)
12184 /* Structor return values (if any) are set by the compiler. */
12185 && !DECL_CONSTRUCTOR_P (fndecl)
12186 && !DECL_DESTRUCTOR_P (fndecl))
12188 warning (OPT_Wreturn_type,
12189 "no return statement in function returning non-void");
12190 TREE_NO_WARNING (fndecl) = 1;
12193 /* Store the end of the function, so that we get good line number
12194 info for the epilogue. */
12195 cfun->function_end_locus = input_location;
12197 /* Genericize before inlining. */
12198 if (!processing_template_decl)
12200 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12201 cp_genericize (fndecl);
12202 /* Clear out the bits we don't need. */
12203 f->x_current_class_ptr = NULL;
12204 f->x_current_class_ref = NULL;
12205 f->x_eh_spec_block = NULL;
12206 f->x_in_charge_parm = NULL;
12207 f->x_vtt_parm = NULL;
12208 f->x_return_value = NULL;
12209 f->bindings = NULL;
12210 f->extern_decl_map = NULL;
12212 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12213 c_warn_unused_result (gimple_body (fndecl));
12215 /* Clear out the bits we don't need. */
12216 local_names = NULL;
12218 /* We're leaving the context of this function, so zap cfun. It's still in
12219 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12221 current_function_decl = NULL;
12223 /* If this is an in-class inline definition, we may have to pop the
12224 bindings for the template parameters that we added in
12225 maybe_begin_member_template_processing when start_function was
12227 if (inclass_inline)
12228 maybe_end_member_template_processing ();
12230 /* Leave the scope of the class. */
12232 pop_nested_class ();
12238 /* Let the error reporting routines know that we're outside a
12239 function. For a nested function, this value is used in
12240 cxx_pop_function_context and then reset via pop_function_context. */
12241 current_function_decl = NULL_TREE;
12243 defer_mark_used_calls = false;
12244 if (deferred_mark_used_calls)
12249 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12251 VEC_free (tree, gc, deferred_mark_used_calls);
12257 /* Create the FUNCTION_DECL for a function definition.
12258 DECLSPECS and DECLARATOR are the parts of the declaration;
12259 they describe the return type and the name of the function,
12260 but twisted together in a fashion that parallels the syntax of C.
12262 This function creates a binding context for the function body
12263 as well as setting up the FUNCTION_DECL in current_function_decl.
12265 Returns a FUNCTION_DECL on success.
12267 If the DECLARATOR is not suitable for a function (it defines a datum
12268 instead), we return 0, which tells yyparse to report a parse error.
12270 May return void_type_node indicating that this method is actually
12271 a friend. See grokfield for more details.
12273 Came here with a `.pushlevel' .
12275 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12276 CHANGES TO CODE IN `grokfield'. */
12279 start_method (cp_decl_specifier_seq *declspecs,
12280 const cp_declarator *declarator, tree attrlist)
12282 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12285 if (fndecl == error_mark_node)
12286 return error_mark_node;
12288 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12290 error ("invalid member function declaration");
12291 return error_mark_node;
12295 cplus_decl_attributes (&fndecl, attrlist, 0);
12297 /* Pass friends other than inline friend functions back. */
12298 if (fndecl == void_type_node)
12301 if (DECL_IN_AGGR_P (fndecl))
12303 if (DECL_CONTEXT (fndecl)
12304 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12305 error ("%qD is already defined in class %qT", fndecl,
12306 DECL_CONTEXT (fndecl));
12307 return error_mark_node;
12310 check_template_shadow (fndecl);
12312 DECL_DECLARED_INLINE_P (fndecl) = 1;
12314 /* We process method specializations in finish_struct_1. */
12315 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12317 fndecl = push_template_decl (fndecl);
12318 if (fndecl == error_mark_node)
12322 if (! DECL_FRIEND_P (fndecl))
12324 if (TREE_CHAIN (fndecl))
12326 fndecl = copy_node (fndecl);
12327 TREE_CHAIN (fndecl) = NULL_TREE;
12331 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12333 /* Make a place for the parms. */
12334 begin_scope (sk_function_parms, fndecl);
12336 DECL_IN_AGGR_P (fndecl) = 1;
12340 /* Go through the motions of finishing a function definition.
12341 We don't compile this method until after the whole class has
12344 FINISH_METHOD must return something that looks as though it
12345 came from GROKFIELD (since we are defining a method, after all).
12347 This is called after parsing the body of the function definition.
12348 STMTS is the chain of statements that makes up the function body.
12350 DECL is the ..._DECL that `start_method' provided. */
12353 finish_method (tree decl)
12355 tree fndecl = decl;
12360 if (decl == void_type_node)
12363 old_initial = DECL_INITIAL (fndecl);
12365 /* Undo the level for the parms (from start_method).
12366 This is like poplevel, but it causes nothing to be
12367 saved. Saving information here confuses symbol-table
12368 output routines. Besides, this information will
12369 be correctly output when this method is actually
12372 /* Clear out the meanings of the local variables of this level;
12373 also record in each decl which block it belongs to. */
12375 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12377 if (DECL_NAME (link) != NULL_TREE)
12378 pop_binding (DECL_NAME (link), link);
12379 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12380 DECL_CONTEXT (link) = NULL_TREE;
12383 poplevel (0, 0, 0);
12385 DECL_INITIAL (fndecl) = old_initial;
12387 /* We used to check if the context of FNDECL was different from
12388 current_class_type as another way to get inside here. This didn't work
12389 for String.cc in libg++. */
12390 if (DECL_FRIEND_P (fndecl))
12392 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12394 decl = void_type_node;
12401 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12402 we can lay it out later, when and if its type becomes complete. */
12405 maybe_register_incomplete_var (tree var)
12407 gcc_assert (TREE_CODE (var) == VAR_DECL);
12409 /* Keep track of variables with incomplete types. */
12410 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12411 && DECL_EXTERNAL (var))
12413 tree inner_type = TREE_TYPE (var);
12415 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12416 inner_type = TREE_TYPE (inner_type);
12417 inner_type = TYPE_MAIN_VARIANT (inner_type);
12419 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12420 /* RTTI TD entries are created while defining the type_info. */
12421 || (TYPE_LANG_SPECIFIC (inner_type)
12422 && TYPE_BEING_DEFINED (inner_type)))
12423 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12427 /* Called when a class type (given by TYPE) is defined. If there are
12428 any existing VAR_DECLs whose type has been completed by this
12429 declaration, update them now. */
12432 complete_vars (tree type)
12434 tree *list = &incomplete_vars;
12436 gcc_assert (CLASS_TYPE_P (type));
12439 if (same_type_p (type, TREE_PURPOSE (*list)))
12441 tree var = TREE_VALUE (*list);
12442 tree type = TREE_TYPE (var);
12443 /* Complete the type of the variable. The VAR_DECL itself
12444 will be laid out in expand_expr. */
12445 complete_type (type);
12446 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12447 /* Remove this entry from the list. */
12448 *list = TREE_CHAIN (*list);
12451 list = &TREE_CHAIN (*list);
12454 /* Check for pending declarations which may have abstract type. */
12455 complete_type_check_abstract (type);
12458 /* If DECL is of a type which needs a cleanup, build and return an
12459 expression to perform that cleanup here. Return NULL_TREE if no
12460 cleanup need be done. */
12463 cxx_maybe_build_cleanup (tree decl)
12469 /* Assume no cleanup is required. */
12470 cleanup = NULL_TREE;
12472 if (error_operand_p (decl))
12475 /* Handle "__attribute__((cleanup))". We run the cleanup function
12476 before the destructor since the destructor is what actually
12477 terminates the lifetime of the object. */
12478 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12485 /* Get the name specified by the user for the cleanup function. */
12486 id = TREE_VALUE (TREE_VALUE (attr));
12487 /* Look up the name to find the cleanup function to call. It is
12488 important to use lookup_name here because that is what is
12489 used in c-common.c:handle_cleanup_attribute when performing
12490 initial checks on the attribute. Note that those checks
12491 include ensuring that the function found is not an overloaded
12492 function, or an object with an overloaded call operator,
12493 etc.; we can rely on the fact that the function found is an
12494 ordinary FUNCTION_DECL. */
12495 fn = lookup_name (id);
12496 arg = build_address (decl);
12498 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12500 tf_warning_or_error);
12502 /* Handle ordinary C++ destructors. */
12503 type = TREE_TYPE (decl);
12504 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12506 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12507 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12508 && CLASSTYPE_VBASECLASSES (type));
12512 if (TREE_CODE (type) == ARRAY_TYPE)
12515 addr = build_address (decl);
12517 /* Optimize for space over speed here. */
12518 if (!has_vbases || flag_expensive_optimizations)
12519 flags |= LOOKUP_NONVIRTUAL;
12521 call = build_delete (TREE_TYPE (addr), addr,
12522 sfk_complete_destructor, flags, 0);
12524 cleanup = build_compound_expr (cleanup, call);
12532 /* When a stmt has been parsed, this function is called. */
12539 /* DECL was originally constructed as a non-static member function,
12540 but turned out to be static. Update it accordingly. */
12543 revert_static_member_fn (tree decl)
12546 tree function = TREE_TYPE (decl);
12547 tree args = TYPE_ARG_TYPES (function);
12549 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12550 != TYPE_UNQUALIFIED)
12551 error ("static member function %q#D declared with type qualifiers", decl);
12553 args = TREE_CHAIN (args);
12554 tmp = build_function_type (TREE_TYPE (function), args);
12555 tmp = build_qualified_type (tmp, cp_type_quals (function));
12556 tmp = build_exception_variant (tmp,
12557 TYPE_RAISES_EXCEPTIONS (function));
12558 TREE_TYPE (decl) = tmp;
12559 if (DECL_ARGUMENTS (decl))
12560 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12561 DECL_STATIC_FUNCTION_P (decl) = 1;
12564 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12565 one of the language-independent trees. */
12567 enum cp_tree_node_structure_enum
12568 cp_tree_node_structure (union lang_tree_node * t)
12570 switch (TREE_CODE (&t->generic))
12572 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12573 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12574 case OVERLOAD: return TS_CP_OVERLOAD;
12575 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12576 case PTRMEM_CST: return TS_CP_PTRMEM;
12577 case BASELINK: return TS_CP_BASELINK;
12578 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12579 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12580 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12581 default: return TS_CP_GENERIC;
12585 /* Build the void_list_node (void_type_node having been created). */
12587 build_void_list_node (void)
12589 tree t = build_tree_list (NULL_TREE, void_type_node);
12594 cp_missing_noreturn_ok_p (tree decl)
12596 /* A missing noreturn is ok for the `main' function. */
12597 return DECL_MAIN_P (decl);
12600 /* Return the COMDAT group into which DECL should be placed. */
12603 cxx_comdat_group (tree decl)
12607 /* Virtual tables, construction virtual tables, and virtual table
12608 tables all go in a single COMDAT group, named after the primary
12610 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12611 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12612 /* For all other DECLs, the COMDAT group is the mangled name of the
12613 declaration itself. */
12616 while (DECL_THUNK_P (decl))
12618 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12619 into the same section as the target function. In that case
12620 we must return target's name. */
12621 tree target = THUNK_TARGET (decl);
12622 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12623 && DECL_SECTION_NAME (target) != NULL
12624 && DECL_ONE_ONLY (target))
12629 name = DECL_ASSEMBLER_NAME (decl);
12632 return IDENTIFIER_POINTER (name);
12635 #include "gt-cp-decl.h"