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, 2009
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 (tree parmlist, 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 tree check_initializer (tree, tree, int, tree *);
85 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
86 static void save_function_data (tree);
87 static void check_function_type (tree, tree);
88 static void finish_constructor_body (void);
89 static void begin_destructor_body (void);
90 static void finish_destructor_body (void);
91 static tree create_array_type_for_decl (tree, tree, tree);
92 static tree get_atexit_node (void);
93 static tree get_dso_handle_node (void);
94 static tree start_cleanup_fn (void);
95 static void end_cleanup_fn (void);
96 static tree cp_make_fname_decl (tree, int);
97 static void initialize_predefined_identifiers (void);
98 static tree check_special_function_return_type
99 (special_function_kind, tree, tree);
100 static tree push_cp_library_fn (enum tree_code, tree);
101 static tree build_cp_library_fn (tree, enum tree_code, tree);
102 static void store_parm_decls (tree);
103 static void initialize_local_var (tree, tree);
104 static void expand_static_init (tree, tree);
105 static tree next_initializable_field (tree);
107 /* The following symbols are subsumed in the cp_global_trees array, and
108 listed here individually for documentation purposes.
111 tree wchar_decl_node;
113 tree vtable_entry_type;
114 tree delta_type_node;
115 tree __t_desc_type_node;
117 tree class_type_node;
118 tree unknown_type_node;
120 Array type `vtable_entry_type[]'
123 tree vtbl_ptr_type_node;
130 A FUNCTION_DECL which can call `abort'. Not necessarily the
131 one that the user will declare, but sufficient to be called
132 by routines that want to abort the program.
136 The FUNCTION_DECL for the default `::operator delete'.
138 tree global_delete_fndecl;
141 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
142 tree tinfo_var_id; */
144 tree cp_global_trees[CPTI_MAX];
146 /* Indicates that there is a type value in some namespace, although
147 that is not necessarily in scope at the moment. */
149 tree global_type_node;
151 /* The node that holds the "name" of the global scope. */
152 tree global_scope_name;
154 #define local_names cp_function_chain->x_local_names
156 /* A list of objects which have constructors or destructors
157 which reside in the global scope. The decl is stored in
158 the TREE_VALUE slot and the initializer is stored
159 in the TREE_PURPOSE slot. */
160 tree static_aggregates;
164 /* A node for the integer constants 2, and 3. */
166 tree integer_two_node, integer_three_node;
168 /* Used only for jumps to as-yet undefined labels, since jumps to
169 defined labels can have their validity checked immediately. */
171 struct named_label_use_entry GTY(())
173 struct named_label_use_entry *next;
174 /* The binding level to which this entry is *currently* attached.
175 This is initially the binding level in which the goto appeared,
176 but is modified as scopes are closed. */
177 struct cp_binding_level *binding_level;
178 /* The head of the names list that was current when the goto appeared,
179 or the inner scope popped. These are the decls that will *not* be
180 skipped when jumping to the label. */
182 /* The location of the goto, for error reporting. */
183 location_t o_goto_locus;
184 /* True if an OpenMP structured block scope has been closed since
185 the goto appeared. This means that the branch from the label will
186 illegally exit an OpenMP scope. */
190 /* A list of all LABEL_DECLs in the function that have names. Here so
191 we can clear out their names' definitions at the end of the
192 function, and so we can check the validity of jumps to these labels. */
194 struct named_label_entry GTY(())
196 /* The decl itself. */
199 /* The binding level to which the label is *currently* attached.
200 This is initially set to the binding level in which the label
201 is defined, but is modified as scopes are closed. */
202 struct cp_binding_level *binding_level;
203 /* The head of the names list that was current when the label was
204 defined, or the inner scope popped. These are the decls that will
205 be skipped when jumping to the label. */
207 /* A tree list of all decls from all binding levels that would be
208 crossed by a backward branch to the label. */
211 /* A list of uses of the label, before the label is defined. */
212 struct named_label_use_entry *uses;
214 /* The following bits are set after the label is defined, and are
215 updated as scopes are popped. They indicate that a backward jump
216 to the label will illegally enter a scope of the given flavor. */
222 #define named_labels cp_function_chain->x_named_labels
224 /* The number of function bodies which we are currently processing.
225 (Zero if we are at namespace scope, one inside the body of a
226 function, two inside the body of a function in a local class, etc.) */
229 /* To avoid unwanted recursion, finish_function defers all mark_used calls
230 encountered during its execution until it finishes. */
231 bool defer_mark_used_calls;
232 VEC(tree, gc) *deferred_mark_used_calls;
234 /* States indicating how grokdeclarator() should handle declspecs marked
235 with __attribute__((deprecated)). An object declared as
236 __attribute__((deprecated)) suppresses warnings of uses of other
238 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
241 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
242 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
243 time the VAR_DECL was declared, the type was incomplete. */
245 static GTY(()) tree incomplete_vars;
247 /* Returns the kind of template specialization we are currently
248 processing, given that it's declaration contained N_CLASS_SCOPES
249 explicit scope qualifications. */
252 current_tmpl_spec_kind (int n_class_scopes)
254 int n_template_parm_scopes = 0;
255 int seen_specialization_p = 0;
256 int innermost_specialization_p = 0;
257 struct cp_binding_level *b;
259 /* Scan through the template parameter scopes. */
260 for (b = current_binding_level;
261 b->kind == sk_template_parms;
264 /* If we see a specialization scope inside a parameter scope,
265 then something is wrong. That corresponds to a declaration
268 template <class T> template <> ...
270 which is always invalid since [temp.expl.spec] forbids the
271 specialization of a class member template if the enclosing
272 class templates are not explicitly specialized as well. */
273 if (b->explicit_spec_p)
275 if (n_template_parm_scopes == 0)
276 innermost_specialization_p = 1;
278 seen_specialization_p = 1;
280 else if (seen_specialization_p == 1)
281 return tsk_invalid_member_spec;
283 ++n_template_parm_scopes;
286 /* Handle explicit instantiations. */
287 if (processing_explicit_instantiation)
289 if (n_template_parm_scopes != 0)
290 /* We've seen a template parameter list during an explicit
291 instantiation. For example:
293 template <class T> template void f(int);
295 This is erroneous. */
296 return tsk_invalid_expl_inst;
298 return tsk_expl_inst;
301 if (n_template_parm_scopes < n_class_scopes)
302 /* We've not seen enough template headers to match all the
303 specialized classes present. For example:
305 template <class T> void R<T>::S<T>::f(int);
307 This is invalid; there needs to be one set of template
308 parameters for each class. */
309 return tsk_insufficient_parms;
310 else if (n_template_parm_scopes == n_class_scopes)
311 /* We're processing a non-template declaration (even though it may
312 be a member of a template class.) For example:
314 template <class T> void S<T>::f(int);
316 The `class T' matches the `S<T>', leaving no template headers
317 corresponding to the `f'. */
319 else if (n_template_parm_scopes > n_class_scopes + 1)
320 /* We've got too many template headers. For example:
322 template <> template <class T> void f (T);
324 There need to be more enclosing classes. */
325 return tsk_excessive_parms;
327 /* This must be a template. It's of the form:
329 template <class T> template <class U> void S<T>::f(U);
331 This is a specialization if the innermost level was a
332 specialization; otherwise it's just a definition of the
334 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
337 /* Exit the current scope. */
345 /* When a label goes out of scope, check to see if that label was used
346 in a valid manner, and issue any appropriate warnings or errors. */
349 pop_label (tree label, tree old_value)
351 if (!processing_template_decl)
353 if (DECL_INITIAL (label) == NULL_TREE)
357 error ("label %q+D used but not defined", label);
358 location = input_location; /* FIXME want (input_filename, (line)0) */
359 /* Avoid crashing later. */
360 define_label (location, DECL_NAME (label));
363 warn_for_unused_label (label);
366 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
369 /* At the end of a function, all labels declared within the function
370 go out of scope. BLOCK is the top-level block for the
374 pop_labels_1 (void **slot, void *data)
376 struct named_label_entry *ent = (struct named_label_entry *) *slot;
377 tree block = (tree) data;
379 pop_label (ent->label_decl, NULL_TREE);
381 /* Put the labels into the "variables" of the top-level block,
382 so debugger can see them. */
383 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
384 BLOCK_VARS (block) = ent->label_decl;
386 htab_clear_slot (named_labels, slot);
392 pop_labels (tree block)
396 htab_traverse (named_labels, pop_labels_1, block);
401 /* At the end of a block with local labels, restore the outer definition. */
404 pop_local_label (tree label, tree old_value)
406 struct named_label_entry dummy;
409 pop_label (label, old_value);
411 dummy.label_decl = label;
412 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
413 htab_clear_slot (named_labels, slot);
416 /* The following two routines are used to interface to Objective-C++.
417 The binding level is purposely treated as an opaque type. */
420 objc_get_current_scope (void)
422 return current_binding_level;
425 /* The following routine is used by the NeXT-style SJLJ exceptions;
426 variables get marked 'volatile' so as to not be clobbered by
427 _setjmp()/_longjmp() calls. All variables in the current scope,
428 as well as parent scopes up to (but not including) ENCLOSING_BLK
429 shall be thusly marked. */
432 objc_mark_locals_volatile (void *enclosing_blk)
434 struct cp_binding_level *scope;
436 for (scope = current_binding_level;
437 scope && scope != enclosing_blk;
438 scope = scope->level_chain)
442 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
443 objc_volatilize_decl (decl);
445 /* Do not climb up past the current function. */
446 if (scope->kind == sk_function_parms)
451 /* Update data for defined and undefined labels when leaving a scope. */
454 poplevel_named_label_1 (void **slot, void *data)
456 struct named_label_entry *ent = (struct named_label_entry *) *slot;
457 struct cp_binding_level *bl = (struct cp_binding_level *) data;
458 struct cp_binding_level *obl = bl->level_chain;
460 if (ent->binding_level == bl)
464 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
465 if (decl_jump_unsafe (decl))
466 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
468 ent->binding_level = obl;
469 ent->names_in_scope = obl->names;
473 ent->in_try_scope = true;
476 ent->in_catch_scope = true;
479 ent->in_omp_scope = true;
487 struct named_label_use_entry *use;
489 for (use = ent->uses; use ; use = use->next)
490 if (use->binding_level == bl)
492 use->binding_level = obl;
493 use->names_in_scope = obl->names;
494 if (bl->kind == sk_omp)
495 use->in_omp_scope = true;
502 /* Exit a binding level.
503 Pop the level off, and restore the state of the identifier-decl mappings
504 that were in effect when this level was entered.
506 If KEEP == 1, this level had explicit declarations, so
507 and create a "block" (a BLOCK node) for the level
508 to record its declarations and subblocks for symbol table output.
510 If FUNCTIONBODY is nonzero, this level is the body of a function,
511 so create a block as if KEEP were set and also clear out all
514 If REVERSE is nonzero, reverse the order of decls before putting
515 them into the BLOCK. */
518 poplevel (int keep, int reverse, int functionbody)
521 /* The chain of decls was accumulated in reverse order.
522 Put it into forward order, just for cleanliness. */
524 int tmp = functionbody;
525 int real_functionbody;
529 int leaving_for_scope;
532 timevar_push (TV_NAME_LOOKUP);
537 gcc_assert (current_binding_level->kind != sk_class);
539 real_functionbody = (current_binding_level->kind == sk_cleanup
540 ? ((functionbody = 0), tmp) : functionbody);
541 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
543 gcc_assert (!VEC_length(cp_class_binding,
544 current_binding_level->class_shadowed));
546 /* We used to use KEEP == 2 to indicate that the new block should go
547 at the beginning of the list of blocks at this binding level,
548 rather than the end. This hack is no longer used. */
549 gcc_assert (keep == 0 || keep == 1);
551 if (current_binding_level->keep)
554 /* Any uses of undefined labels, and any defined labels, now operate
555 under constraints of next binding contour. */
556 if (cfun && !functionbody && named_labels)
557 htab_traverse (named_labels, poplevel_named_label_1,
558 current_binding_level);
560 /* Get the decls in the order they were written.
561 Usually current_binding_level->names is in reverse order.
562 But parameter decls were previously put in forward order. */
565 current_binding_level->names
566 = decls = nreverse (current_binding_level->names);
568 decls = current_binding_level->names;
570 /* If there were any declarations or structure tags in that level,
571 or if this level is a function body,
572 create a BLOCK to record them for the life of this function. */
574 if (keep == 1 || functionbody)
575 block = make_node (BLOCK);
576 if (block != NULL_TREE)
578 BLOCK_VARS (block) = decls;
579 BLOCK_SUBBLOCKS (block) = subblocks;
582 /* In each subblock, record that this is its superior. */
584 for (link = subblocks; link; link = BLOCK_CHAIN (link))
585 BLOCK_SUPERCONTEXT (link) = block;
587 /* We still support the old for-scope rules, whereby the variables
588 in a for-init statement were in scope after the for-statement
589 ended. We only use the new rules if flag_new_for_scope is
592 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
594 /* Before we remove the declarations first check for unused variables. */
595 if (warn_unused_variable
596 && !processing_template_decl)
597 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
598 if (TREE_CODE (decl) == VAR_DECL
599 && ! TREE_USED (decl)
600 && ! DECL_IN_SYSTEM_HEADER (decl)
601 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
602 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
604 /* Remove declarations for all the DECLs in this level. */
605 for (link = decls; link; link = TREE_CHAIN (link))
607 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
610 tree name = DECL_NAME (link);
614 ob = outer_binding (name,
615 IDENTIFIER_BINDING (name),
618 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
620 ns_binding = NULL_TREE;
622 if (ob && ob->scope == current_binding_level->level_chain)
623 /* We have something like:
628 and we are leaving the `for' scope. There's no reason to
629 keep the binding of the inner `i' in this case. */
630 pop_binding (name, link);
631 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
632 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
633 /* Here, we have something like:
641 We must pop the for-scope binding so we know what's a
642 type and what isn't. */
643 pop_binding (name, link);
646 /* Mark this VAR_DECL as dead so that we can tell we left it
647 there only for backward compatibility. */
648 DECL_DEAD_FOR_LOCAL (link) = 1;
650 /* Keep track of what should have happened when we
651 popped the binding. */
654 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
655 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
658 /* Add it to the list of dead variables in the next
659 outermost binding to that we can remove these when we
660 leave that binding. */
661 current_binding_level->level_chain->dead_vars_from_for
662 = tree_cons (NULL_TREE, link,
663 current_binding_level->level_chain->
666 /* Although we don't pop the cxx_binding, we do clear
667 its SCOPE since the scope is going away now. */
668 IDENTIFIER_BINDING (name)->scope
669 = current_binding_level->level_chain;
676 /* Remove the binding. */
679 if (TREE_CODE (decl) == TREE_LIST)
680 decl = TREE_VALUE (decl);
683 if (TREE_CODE (name) == OVERLOAD)
684 name = OVL_FUNCTION (name);
686 gcc_assert (DECL_P (name));
687 pop_binding (DECL_NAME (name), decl);
691 /* Remove declarations for any `for' variables from inner scopes
692 that we kept around. */
693 for (link = current_binding_level->dead_vars_from_for;
694 link; link = TREE_CHAIN (link))
695 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
697 /* Restore the IDENTIFIER_TYPE_VALUEs. */
698 for (link = current_binding_level->type_shadowed;
699 link; link = TREE_CHAIN (link))
700 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
702 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
703 for (link = current_binding_level->shadowed_labels;
705 link = TREE_CHAIN (link))
706 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
708 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
709 list if a `using' declaration put them there. The debugging
710 back ends won't understand OVERLOAD, so we remove them here.
711 Because the BLOCK_VARS are (temporarily) shared with
712 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
713 popped all the bindings. */
718 for (d = &BLOCK_VARS (block); *d; )
720 if (TREE_CODE (*d) == TREE_LIST)
721 *d = TREE_CHAIN (*d);
723 d = &TREE_CHAIN (*d);
727 /* If the level being exited is the top level of a function,
728 check over all the labels. */
731 /* Since this is the top level block of a function, the vars are
732 the function's parameters. Don't leave them in the BLOCK
733 because they are found in the FUNCTION_DECL instead. */
734 BLOCK_VARS (block) = 0;
738 kind = current_binding_level->kind;
739 if (kind == sk_cleanup)
743 /* If this is a temporary binding created for a cleanup, then we'll
744 have pushed a statement list level. Pop that, create a new
745 BIND_EXPR for the block, and insert it into the stream. */
746 stmt = pop_stmt_list (current_binding_level->statement_list);
747 stmt = c_build_bind_expr (block, stmt);
754 /* The current function is being defined, so its DECL_INITIAL
755 should be error_mark_node. */
756 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
757 DECL_INITIAL (current_function_decl) = block;
760 current_binding_level->blocks
761 = chainon (current_binding_level->blocks, block);
763 /* If we did not make a block for the level just exited,
764 any blocks made for inner levels
765 (since they cannot be recorded as subblocks in that level)
766 must be carried forward so they will later become subblocks
767 of something else. */
769 current_binding_level->blocks
770 = chainon (current_binding_level->blocks, subblocks);
772 /* Each and every BLOCK node created here in `poplevel' is important
773 (e.g. for proper debugging information) so if we created one
774 earlier, mark it as "used". */
776 TREE_USED (block) = 1;
778 /* All temporary bindings created for cleanups are popped silently. */
779 if (kind == sk_cleanup)
782 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
785 /* Insert BLOCK at the end of the list of subblocks of the
786 current binding level. This is used when a BIND_EXPR is expanded,
787 to handle the BLOCK node inside the BIND_EXPR. */
790 insert_block (tree block)
792 TREE_USED (block) = 1;
793 current_binding_level->blocks
794 = chainon (current_binding_level->blocks, block);
797 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
798 itself, calling F for each. The DATA is passed to F as well. */
801 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
804 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
806 result |= (*f) (name_space, data);
808 for (; current; current = TREE_CHAIN (current))
809 result |= walk_namespaces_r (current, f, data);
814 /* Walk all the namespaces, calling F for each. The DATA is passed to
818 walk_namespaces (walk_namespaces_fn f, void* data)
820 return walk_namespaces_r (global_namespace, f, data);
823 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
824 DATA is non-NULL, this is the last time we will call
825 wrapup_global_declarations for this NAMESPACE. */
828 wrapup_globals_for_namespace (tree name_space, void* data)
830 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
831 VEC(tree,gc) *statics = level->static_decls;
832 tree *vec = VEC_address (tree, statics);
833 int len = VEC_length (tree, statics);
834 int last_time = (data != 0);
838 check_global_declarations (vec, len);
839 emit_debug_global_declarations (vec, len);
843 /* Write out any globals that need to be output. */
844 return wrapup_global_declarations (vec, len);
848 /* In C++, you don't have to write `struct S' to refer to `S'; you
849 can just use `S'. We accomplish this by creating a TYPE_DECL as
850 if the user had written `typedef struct S S'. Create and return
851 the TYPE_DECL for TYPE. */
854 create_implicit_typedef (tree name, tree type)
858 decl = build_decl (TYPE_DECL, name, type);
859 DECL_ARTIFICIAL (decl) = 1;
860 /* There are other implicit type declarations, like the one *within*
861 a class that allows you to write `S::S'. We must distinguish
863 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
864 TYPE_NAME (type) = decl;
869 /* Remember a local name for name-mangling purposes. */
872 push_local_name (tree decl)
877 timevar_push (TV_NAME_LOOKUP);
879 name = DECL_NAME (decl);
881 nelts = VEC_length (tree, local_names);
882 for (i = 0; i < nelts; i++)
884 t = VEC_index (tree, local_names, i);
885 if (DECL_NAME (t) == name)
887 if (!DECL_LANG_SPECIFIC (decl))
888 retrofit_lang_decl (decl);
889 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
890 if (DECL_LANG_SPECIFIC (t))
891 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
893 DECL_DISCRIMINATOR (decl) = 1;
895 VEC_replace (tree, local_names, i, decl);
896 timevar_pop (TV_NAME_LOOKUP);
901 VEC_safe_push (tree, gc, local_names, decl);
902 timevar_pop (TV_NAME_LOOKUP);
905 /* Subroutine of duplicate_decls: return truthvalue of whether
906 or not types of these decls match.
908 For C++, we must compare the parameter list so that `int' can match
909 `int&' in a parameter position, but `int&' is not confused with
913 decls_match (tree newdecl, tree olddecl)
917 if (newdecl == olddecl)
920 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
921 /* If the two DECLs are not even the same kind of thing, we're not
922 interested in their types. */
925 if (TREE_CODE (newdecl) == FUNCTION_DECL)
927 tree f1 = TREE_TYPE (newdecl);
928 tree f2 = TREE_TYPE (olddecl);
929 tree p1 = TYPE_ARG_TYPES (f1);
930 tree p2 = TYPE_ARG_TYPES (f2);
932 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
933 && ! (DECL_EXTERN_C_P (newdecl)
934 && DECL_EXTERN_C_P (olddecl)))
937 if (TREE_CODE (f1) != TREE_CODE (f2))
940 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
942 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
943 && (DECL_BUILT_IN (olddecl)
944 #ifndef NO_IMPLICIT_EXTERN_C
945 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
946 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
950 types_match = self_promoting_args_p (p1);
951 if (p1 == void_list_node)
952 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
954 #ifndef NO_IMPLICIT_EXTERN_C
955 else if (p1 == NULL_TREE
956 && (DECL_EXTERN_C_P (olddecl)
957 && DECL_IN_SYSTEM_HEADER (olddecl)
958 && !DECL_CLASS_SCOPE_P (olddecl))
959 && (DECL_EXTERN_C_P (newdecl)
960 && DECL_IN_SYSTEM_HEADER (newdecl)
961 && !DECL_CLASS_SCOPE_P (newdecl)))
963 types_match = self_promoting_args_p (p2);
964 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
968 types_match = compparms (p1, p2);
973 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
975 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
976 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
979 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
980 DECL_TEMPLATE_PARMS (olddecl)))
983 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
984 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
985 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
987 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
988 DECL_TEMPLATE_RESULT (newdecl));
992 /* Need to check scope for variable declaration (VAR_DECL).
993 For typedef (TYPE_DECL), scope is ignored. */
994 if (TREE_CODE (newdecl) == VAR_DECL
995 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
997 Two declarations for an object with C language linkage
998 with the same name (ignoring the namespace that qualify
999 it) that appear in different namespace scopes refer to
1001 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1004 if (TREE_TYPE (newdecl) == error_mark_node)
1005 types_match = TREE_TYPE (olddecl) == error_mark_node;
1006 else if (TREE_TYPE (olddecl) == NULL_TREE)
1007 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1008 else if (TREE_TYPE (newdecl) == NULL_TREE)
1011 types_match = comptypes (TREE_TYPE (newdecl),
1012 TREE_TYPE (olddecl),
1013 COMPARE_REDECLARATION);
1019 /* If NEWDECL is `static' and an `extern' was seen previously,
1020 warn about it. OLDDECL is the previous declaration.
1022 Note that this does not apply to the C++ case of declaring
1023 a variable `extern const' and then later `const'.
1025 Don't complain about built-in functions, since they are beyond
1026 the user's control. */
1029 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1033 if (TREE_CODE (newdecl) == TYPE_DECL
1034 || TREE_CODE (newdecl) == TEMPLATE_DECL
1035 || TREE_CODE (newdecl) == CONST_DECL
1036 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1039 /* Don't get confused by static member functions; that's a different
1041 if (TREE_CODE (newdecl) == FUNCTION_DECL
1042 && DECL_STATIC_FUNCTION_P (newdecl))
1045 /* If the old declaration was `static', or the new one isn't, then
1046 then everything is OK. */
1047 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1050 /* It's OK to declare a builtin function as `static'. */
1051 if (TREE_CODE (olddecl) == FUNCTION_DECL
1052 && DECL_ARTIFICIAL (olddecl))
1055 name = DECL_ASSEMBLER_NAME (newdecl);
1056 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1057 permerror (input_location, "previous declaration of %q+D", olddecl);
1060 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1061 function templates. If their exception specifications do not
1062 match, issue a diagnostic. */
1065 check_redeclaration_exception_specification (tree new_decl,
1070 tree new_exceptions;
1071 tree old_exceptions;
1073 new_type = TREE_TYPE (new_decl);
1074 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1075 old_type = TREE_TYPE (old_decl);
1076 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1080 If any declaration of a function has an exception-specification,
1081 all declarations, including the definition and an explicit
1082 specialization, of that function shall have an
1083 exception-specification with the same set of type-ids. */
1084 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1085 && ! DECL_IS_BUILTIN (old_decl)
1087 && !comp_except_specs (new_exceptions, old_exceptions,
1090 error ("declaration of %qF throws different exceptions", new_decl);
1091 error ("from previous declaration %q+F", old_decl);
1095 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1096 && lookup_attribute ("gnu_inline", \
1097 DECL_ATTRIBUTES (fn)))
1099 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1100 If the redeclaration is invalid, a diagnostic is issued, and the
1101 error_mark_node is returned. Otherwise, OLDDECL is returned.
1103 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1106 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1109 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1111 unsigned olddecl_uid = DECL_UID (olddecl);
1112 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1113 int new_defines_function = 0;
1116 if (newdecl == olddecl)
1119 types_match = decls_match (newdecl, olddecl);
1121 /* If either the type of the new decl or the type of the old decl is an
1122 error_mark_node, then that implies that we have already issued an
1123 error (earlier) for some bogus type specification, and in that case,
1124 it is rather pointless to harass the user with yet more error message
1125 about the same declaration, so just pretend the types match here. */
1126 if (TREE_TYPE (newdecl) == error_mark_node
1127 || TREE_TYPE (olddecl) == error_mark_node)
1128 return error_mark_node;
1130 if (DECL_P (olddecl)
1131 && TREE_CODE (newdecl) == FUNCTION_DECL
1132 && TREE_CODE (olddecl) == FUNCTION_DECL
1133 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1135 if (DECL_DECLARED_INLINE_P (newdecl)
1136 && DECL_UNINLINABLE (newdecl)
1137 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1138 /* Already warned elsewhere. */;
1139 else if (DECL_DECLARED_INLINE_P (olddecl)
1140 && DECL_UNINLINABLE (olddecl)
1141 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1142 /* Already warned. */;
1143 else if (DECL_DECLARED_INLINE_P (newdecl)
1144 && DECL_UNINLINABLE (olddecl)
1145 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1147 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1149 warning (OPT_Wattributes, "previous declaration of %q+D "
1150 "with attribute noinline", olddecl);
1152 else if (DECL_DECLARED_INLINE_P (olddecl)
1153 && DECL_UNINLINABLE (newdecl)
1154 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1156 warning (OPT_Wattributes, "function %q+D redeclared with "
1157 "attribute noinline", newdecl);
1158 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1163 /* Check for redeclaration and other discrepancies. */
1164 if (TREE_CODE (olddecl) == FUNCTION_DECL
1165 && DECL_ARTIFICIAL (olddecl))
1167 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1168 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1170 /* Avoid warnings redeclaring built-ins which have not been
1171 explicitly declared. */
1172 if (DECL_ANTICIPATED (olddecl))
1175 /* If you declare a built-in or predefined function name as static,
1176 the old definition is overridden, but optionally warn this was a
1177 bad choice of name. */
1178 if (! TREE_PUBLIC (newdecl))
1180 warning (OPT_Wshadow, "shadowing %s function %q#D",
1181 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1183 /* Discard the old built-in function. */
1186 /* If the built-in is not ansi, then programs can override
1187 it even globally without an error. */
1188 else if (! DECL_BUILT_IN (olddecl))
1189 warning (0, "library function %q#D redeclared as non-function %q#D",
1193 error ("declaration of %q#D", newdecl);
1194 error ("conflicts with built-in declaration %q#D",
1199 else if (!types_match)
1201 /* Avoid warnings redeclaring built-ins which have not been
1202 explicitly declared. */
1203 if (DECL_ANTICIPATED (olddecl))
1205 /* Deal with fileptr_type_node. FILE type is not known
1206 at the time we create the builtins. */
1209 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1210 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1212 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1215 else if (TREE_VALUE (t2) == fileptr_type_node)
1217 tree t = TREE_VALUE (t1);
1219 if (TREE_CODE (t) == POINTER_TYPE
1220 && TYPE_NAME (TREE_TYPE (t))
1221 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1222 == get_identifier ("FILE")
1223 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1225 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1227 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1228 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1229 types_match = decls_match (newdecl, olddecl);
1231 return duplicate_decls (newdecl, olddecl,
1233 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1236 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1239 else if ((DECL_EXTERN_C_P (newdecl)
1240 && DECL_EXTERN_C_P (olddecl))
1241 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1242 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1244 /* A near match; override the builtin. */
1246 if (TREE_PUBLIC (newdecl))
1248 warning (0, "new declaration %q#D", newdecl);
1249 warning (0, "ambiguates built-in declaration %q#D",
1253 warning (OPT_Wshadow, "shadowing %s function %q#D",
1254 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1258 /* Discard the old built-in function. */
1261 /* Replace the old RTL to avoid problems with inlining. */
1262 COPY_DECL_RTL (newdecl, olddecl);
1264 /* Even if the types match, prefer the new declarations type for
1265 built-ins which have not been explicitly declared, for
1266 exception lists, etc... */
1267 else if (DECL_ANTICIPATED (olddecl))
1269 tree type = TREE_TYPE (newdecl);
1270 tree attribs = (*targetm.merge_type_attributes)
1271 (TREE_TYPE (olddecl), type);
1273 type = cp_build_type_attribute_variant (type, attribs);
1274 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1277 /* If a function is explicitly declared "throw ()", propagate that to
1278 the corresponding builtin. */
1279 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1280 && DECL_ANTICIPATED (olddecl)
1281 && TREE_NOTHROW (newdecl)
1282 && !TREE_NOTHROW (olddecl)
1283 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1284 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1286 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1288 /* Whether or not the builtin can throw exceptions has no
1289 bearing on this declarator. */
1290 TREE_NOTHROW (olddecl) = 0;
1292 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1294 /* If a builtin function is redeclared as `static', merge
1295 the declarations, but make the original one static. */
1296 DECL_THIS_STATIC (olddecl) = 1;
1297 TREE_PUBLIC (olddecl) = 0;
1299 /* Make the old declaration consistent with the new one so
1300 that all remnants of the builtin-ness of this function
1301 will be banished. */
1302 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1303 COPY_DECL_RTL (newdecl, olddecl);
1306 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1308 /* C++ Standard, 3.3, clause 4:
1309 "[Note: a namespace name or a class template name must be unique
1310 in its declarative region (7.3.2, clause 14). ]" */
1311 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1312 && TREE_CODE (newdecl) != NAMESPACE_DECL
1313 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1314 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1315 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1316 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1318 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1319 && TREE_CODE (newdecl) != TYPE_DECL)
1320 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1321 && TREE_CODE (olddecl) != TYPE_DECL))
1323 /* We do nothing special here, because C++ does such nasty
1324 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1325 get shadowed, and know that if we need to find a TYPE_DECL
1326 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1327 slot of the identifier. */
1331 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1332 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1333 || (TREE_CODE (olddecl) == FUNCTION_DECL
1334 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1338 error ("%q#D redeclared as different kind of symbol", newdecl);
1339 if (TREE_CODE (olddecl) == TREE_LIST)
1340 olddecl = TREE_VALUE (olddecl);
1341 error ("previous declaration of %q+#D", olddecl);
1343 return error_mark_node;
1345 else if (!types_match)
1347 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1348 /* These are certainly not duplicate declarations; they're
1349 from different scopes. */
1352 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1354 /* The name of a class template may not be declared to refer to
1355 any other template, class, function, object, namespace, value,
1356 or type in the same scope. */
1357 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1358 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1360 error ("declaration of template %q#D", newdecl);
1361 error ("conflicts with previous declaration %q+#D", olddecl);
1363 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1364 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1365 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1366 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1367 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1368 DECL_TEMPLATE_PARMS (olddecl))
1369 /* Template functions can be disambiguated by
1371 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1372 TREE_TYPE (TREE_TYPE (olddecl))))
1374 error ("new declaration %q#D", newdecl);
1375 error ("ambiguates old declaration %q+#D", olddecl);
1379 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1381 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1383 error ("declaration of C function %q#D conflicts with",
1385 error ("previous declaration %q+#D here", olddecl);
1387 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1388 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1390 error ("new declaration %q#D", newdecl);
1391 error ("ambiguates old declaration %q+#D", olddecl);
1392 return error_mark_node;
1399 error ("conflicting declaration %q#D", newdecl);
1400 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1401 return error_mark_node;
1404 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1405 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1406 && (!DECL_TEMPLATE_INFO (newdecl)
1407 || (DECL_TI_TEMPLATE (newdecl)
1408 != DECL_TI_TEMPLATE (olddecl))))
1409 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1410 && (!DECL_TEMPLATE_INFO (olddecl)
1411 || (DECL_TI_TEMPLATE (olddecl)
1412 != DECL_TI_TEMPLATE (newdecl))))))
1413 /* It's OK to have a template specialization and a non-template
1414 with the same type, or to have specializations of two
1415 different templates with the same type. Note that if one is a
1416 specialization, and the other is an instantiation of the same
1417 template, that we do not exit at this point. That situation
1418 can occur if we instantiate a template class, and then
1419 specialize one of its methods. This situation is valid, but
1420 the declarations must be merged in the usual way. */
1422 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1423 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1424 && !DECL_USE_TEMPLATE (newdecl))
1425 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1426 && !DECL_USE_TEMPLATE (olddecl))))
1427 /* One of the declarations is a template instantiation, and the
1428 other is not a template at all. That's OK. */
1430 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1432 /* In [namespace.alias] we have:
1434 In a declarative region, a namespace-alias-definition can be
1435 used to redefine a namespace-alias declared in that declarative
1436 region to refer only to the namespace to which it already
1439 Therefore, if we encounter a second alias directive for the same
1440 alias, we can just ignore the second directive. */
1441 if (DECL_NAMESPACE_ALIAS (newdecl)
1442 && (DECL_NAMESPACE_ALIAS (newdecl)
1443 == DECL_NAMESPACE_ALIAS (olddecl)))
1445 /* [namespace.alias]
1447 A namespace-name or namespace-alias shall not be declared as
1448 the name of any other entity in the same declarative region.
1449 A namespace-name defined at global scope shall not be
1450 declared as the name of any other entity in any global scope
1452 error ("declaration of namespace %qD conflicts with", newdecl);
1453 error ("previous declaration of namespace %q+D here", olddecl);
1454 return error_mark_node;
1458 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1461 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1462 if (DECL_NAME (olddecl) != NULL_TREE)
1463 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1464 ? "%q+#D previously defined here"
1465 : "%q+#D previously declared here", olddecl);
1466 return error_mark_node;
1468 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1469 && DECL_INITIAL (olddecl) != NULL_TREE
1470 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1471 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1473 /* Prototype decl follows defn w/o prototype. */
1474 warning (0, "prototype for %q+#D", newdecl);
1475 warning (0, "%Jfollows non-prototype definition here", olddecl);
1477 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1478 || TREE_CODE (olddecl) == VAR_DECL)
1479 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1482 If two declarations of the same function or object
1483 specify different linkage-specifications ..., the program
1484 is ill-formed.... Except for functions with C++ linkage,
1485 a function declaration without a linkage specification
1486 shall not precede the first linkage specification for
1487 that function. A function can be declared without a
1488 linkage specification after an explicit linkage
1489 specification has been seen; the linkage explicitly
1490 specified in the earlier declaration is not affected by
1491 such a function declaration.
1493 DR 563 raises the question why the restrictions on
1494 functions should not also apply to objects. Older
1495 versions of G++ silently ignore the linkage-specification
1503 which is clearly wrong. Therefore, we now treat objects
1505 if (current_lang_depth () == 0)
1507 /* There is no explicit linkage-specification, so we use
1508 the linkage from the previous declaration. */
1509 if (!DECL_LANG_SPECIFIC (newdecl))
1510 retrofit_lang_decl (newdecl);
1511 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1515 error ("previous declaration of %q+#D with %qL linkage",
1516 olddecl, DECL_LANGUAGE (olddecl));
1517 error ("conflicts with new declaration with %qL linkage",
1518 DECL_LANGUAGE (newdecl));
1522 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1524 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1526 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1527 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1530 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1531 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1533 for (; t1 && t1 != void_list_node;
1534 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1535 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1537 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1540 permerror (input_location, "default argument given for parameter %d of %q#D",
1542 permerror (input_location, "after previous specification in %q+#D", olddecl);
1546 error ("default argument given for parameter %d of %q#D",
1548 error ("after previous specification in %q+#D",
1555 /* Do not merge an implicit typedef with an explicit one. In:
1559 typedef class A A __attribute__ ((foo));
1561 the attribute should apply only to the typedef. */
1562 if (TREE_CODE (olddecl) == TYPE_DECL
1563 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1564 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1567 /* If new decl is `static' and an `extern' was seen previously,
1569 warn_extern_redeclared_static (newdecl, olddecl);
1571 /* We have committed to returning 1 at this point. */
1572 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1574 /* Now that functions must hold information normally held
1575 by field decls, there is extra work to do so that
1576 declaration information does not get destroyed during
1578 if (DECL_VINDEX (olddecl))
1579 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1580 if (DECL_CONTEXT (olddecl))
1581 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1582 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1583 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1584 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1585 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1586 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1587 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1588 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1589 SET_OVERLOADED_OPERATOR_CODE
1590 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1591 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1593 /* Optionally warn about more than one declaration for the same
1594 name, but don't warn about a function declaration followed by a
1596 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1597 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1598 /* Don't warn about extern decl followed by definition. */
1599 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1600 /* Don't warn about friends, let add_friend take care of it. */
1601 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1603 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1604 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1607 if (DECL_DELETED_FN (newdecl))
1609 error ("deleted definition of %qD", newdecl);
1610 error ("after previous declaration %q+D", olddecl);
1614 /* Deal with C++: must preserve virtual function table size. */
1615 if (TREE_CODE (olddecl) == TYPE_DECL)
1617 tree newtype = TREE_TYPE (newdecl);
1618 tree oldtype = TREE_TYPE (olddecl);
1620 if (newtype != error_mark_node && oldtype != error_mark_node
1621 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1622 CLASSTYPE_FRIEND_CLASSES (newtype)
1623 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1625 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1628 /* Copy all the DECL_... slots specified in the new decl
1629 except for any that we copy here from the old type. */
1630 DECL_ATTRIBUTES (newdecl)
1631 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1633 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1637 old_result = DECL_TEMPLATE_RESULT (olddecl);
1638 new_result = DECL_TEMPLATE_RESULT (newdecl);
1639 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1640 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1641 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1642 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1644 DECL_ATTRIBUTES (old_result)
1645 = (*targetm.merge_decl_attributes) (old_result, new_result);
1647 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1649 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1650 && DECL_INITIAL (new_result))
1652 if (DECL_INITIAL (old_result))
1653 DECL_UNINLINABLE (old_result) = 1;
1655 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1656 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1657 DECL_NOT_REALLY_EXTERN (old_result)
1658 = DECL_NOT_REALLY_EXTERN (new_result);
1659 DECL_INTERFACE_KNOWN (old_result)
1660 = DECL_INTERFACE_KNOWN (new_result);
1661 DECL_DECLARED_INLINE_P (old_result)
1662 = DECL_DECLARED_INLINE_P (new_result);
1663 DECL_DISREGARD_INLINE_LIMITS (old_result)
1664 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1669 DECL_DECLARED_INLINE_P (old_result)
1670 |= DECL_DECLARED_INLINE_P (new_result);
1671 DECL_DISREGARD_INLINE_LIMITS (old_result)
1672 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1673 check_redeclaration_exception_specification (newdecl, olddecl);
1677 /* If the new declaration is a definition, update the file and
1678 line information on the declaration, and also make
1679 the old declaration the same definition. */
1680 if (DECL_INITIAL (new_result) != NULL_TREE)
1682 DECL_SOURCE_LOCATION (olddecl)
1683 = DECL_SOURCE_LOCATION (old_result)
1684 = DECL_SOURCE_LOCATION (newdecl);
1685 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1686 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1687 DECL_ARGUMENTS (old_result)
1688 = DECL_ARGUMENTS (new_result);
1696 /* Automatically handles default parameters. */
1697 tree oldtype = TREE_TYPE (olddecl);
1700 /* Merge the data types specified in the two decls. */
1701 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1703 /* If merge_types produces a non-typedef type, just use the old type. */
1704 if (TREE_CODE (newdecl) == TYPE_DECL
1705 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1708 if (TREE_CODE (newdecl) == VAR_DECL)
1710 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1711 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1712 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1713 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1714 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1715 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1717 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1718 if (DECL_LANG_SPECIFIC (olddecl)
1719 && CP_DECL_THREADPRIVATE_P (olddecl))
1721 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1722 if (!DECL_LANG_SPECIFIC (newdecl))
1723 retrofit_lang_decl (newdecl);
1725 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1726 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1730 /* Do this after calling `merge_types' so that default
1731 parameters don't confuse us. */
1732 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1733 check_redeclaration_exception_specification (newdecl, olddecl);
1734 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1736 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1737 check_default_args (newdecl);
1739 /* Lay the type out, unless already done. */
1740 if (! same_type_p (newtype, oldtype)
1741 && TREE_TYPE (newdecl) != error_mark_node
1742 && !(processing_template_decl && uses_template_parms (newdecl)))
1743 layout_type (TREE_TYPE (newdecl));
1745 if ((TREE_CODE (newdecl) == VAR_DECL
1746 || TREE_CODE (newdecl) == PARM_DECL
1747 || TREE_CODE (newdecl) == RESULT_DECL
1748 || TREE_CODE (newdecl) == FIELD_DECL
1749 || TREE_CODE (newdecl) == TYPE_DECL)
1750 && !(processing_template_decl && uses_template_parms (newdecl)))
1751 layout_decl (newdecl, 0);
1753 /* Merge the type qualifiers. */
1754 if (TREE_READONLY (newdecl))
1755 TREE_READONLY (olddecl) = 1;
1756 if (TREE_THIS_VOLATILE (newdecl))
1757 TREE_THIS_VOLATILE (olddecl) = 1;
1758 if (TREE_NOTHROW (newdecl))
1759 TREE_NOTHROW (olddecl) = 1;
1761 /* Merge deprecatedness. */
1762 if (TREE_DEPRECATED (newdecl))
1763 TREE_DEPRECATED (olddecl) = 1;
1765 /* Preserve function specific target and optimization options */
1766 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1768 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1769 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1770 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1771 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1773 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1774 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1775 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1776 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1779 /* Merge the initialization information. */
1780 if (DECL_INITIAL (newdecl) == NULL_TREE
1781 && DECL_INITIAL (olddecl) != NULL_TREE)
1783 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1784 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1785 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1786 && DECL_LANG_SPECIFIC (newdecl)
1787 && DECL_LANG_SPECIFIC (olddecl))
1789 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1790 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1794 /* Merge the section attribute.
1795 We want to issue an error if the sections conflict but that must be
1796 done later in decl_attributes since we are called before attributes
1798 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1799 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1801 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1803 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1804 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1805 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1806 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1807 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1808 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1809 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1810 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1811 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1812 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1813 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1814 /* Keep the old RTL. */
1815 COPY_DECL_RTL (olddecl, newdecl);
1817 else if (TREE_CODE (newdecl) == VAR_DECL
1818 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1820 /* Keep the old RTL. We cannot keep the old RTL if the old
1821 declaration was for an incomplete object and the new
1822 declaration is not since many attributes of the RTL will
1824 COPY_DECL_RTL (olddecl, newdecl);
1827 /* If cannot merge, then use the new type and qualifiers,
1828 and don't preserve the old rtl. */
1831 /* Clean out any memory we had of the old declaration. */
1832 tree oldstatic = value_member (olddecl, static_aggregates);
1834 TREE_VALUE (oldstatic) = error_mark_node;
1836 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1837 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1838 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1839 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1842 /* Merge the storage class information. */
1843 merge_weak (newdecl, olddecl);
1845 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1846 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1847 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1848 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1849 if (! DECL_EXTERNAL (olddecl))
1850 DECL_EXTERNAL (newdecl) = 0;
1852 new_template = NULL_TREE;
1853 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1855 bool new_redefines_gnu_inline = false;
1857 if (new_defines_function
1858 && ((DECL_INTERFACE_KNOWN (olddecl)
1859 && TREE_CODE (olddecl) == FUNCTION_DECL)
1860 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1861 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1862 == FUNCTION_DECL))))
1866 if (TREE_CODE (fn) == TEMPLATE_DECL)
1867 fn = DECL_TEMPLATE_RESULT (olddecl);
1869 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1872 if (!new_redefines_gnu_inline)
1874 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1875 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1876 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1878 DECL_TEMPLATE_INSTANTIATED (newdecl)
1879 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1881 /* If the OLDDECL is an instantiation and/or specialization,
1882 then the NEWDECL must be too. But, it may not yet be marked
1883 as such if the caller has created NEWDECL, but has not yet
1884 figured out that it is a redeclaration. */
1885 if (!DECL_USE_TEMPLATE (newdecl))
1886 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1888 /* Don't really know how much of the language-specific
1889 values we should copy from old to new. */
1890 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1891 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1892 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1893 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1894 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1895 if (DECL_TEMPLATE_INFO (newdecl))
1896 new_template = DECL_TI_TEMPLATE (newdecl);
1897 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1898 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1899 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1900 olddecl_friend = DECL_FRIEND_P (olddecl);
1901 hidden_friend = (DECL_ANTICIPATED (olddecl)
1902 && DECL_HIDDEN_FRIEND_P (olddecl)
1903 && newdecl_is_friend);
1905 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1906 if (TREE_CODE (newdecl) == FUNCTION_DECL
1907 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1909 DECL_BEFRIENDING_CLASSES (newdecl)
1910 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1911 DECL_BEFRIENDING_CLASSES (olddecl));
1912 /* DECL_THUNKS is only valid for virtual functions,
1913 otherwise it is a DECL_FRIEND_CONTEXT. */
1914 if (DECL_VIRTUAL_P (newdecl))
1915 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1919 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1921 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1922 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1924 /* If newdecl is not a specialization, then it is not a
1925 template-related function at all. And that means that we
1926 should have exited above, returning 0. */
1927 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1929 if (TREE_USED (olddecl))
1930 /* From [temp.expl.spec]:
1932 If a template, a member template or the member of a class
1933 template is explicitly specialized then that
1934 specialization shall be declared before the first use of
1935 that specialization that would cause an implicit
1936 instantiation to take place, in every translation unit in
1937 which such a use occurs. */
1938 error ("explicit specialization of %qD after first use",
1941 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1943 /* Don't propagate visibility from the template to the
1944 specialization here. We'll do that in determine_visibility if
1946 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1948 /* [temp.expl.spec/14] We don't inline explicit specialization
1949 just because the primary template says so. */
1951 else if (new_defines_function && DECL_INITIAL (olddecl))
1953 /* Never inline re-defined extern inline functions.
1954 FIXME: this could be better handled by keeping both
1955 function as separate declarations. */
1956 DECL_UNINLINABLE (newdecl) = 1;
1960 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1961 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1963 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1965 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1966 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1968 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1969 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1970 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1971 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1974 /* Preserve abstractness on cloned [cd]tors. */
1975 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1979 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1980 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1981 COPY_DECL_RTL (newdecl, olddecl);
1983 if (! types_match || new_defines_function)
1985 /* These need to be copied so that the names are available.
1986 Note that if the types do match, we'll preserve inline
1987 info and other bits, but if not, we won't. */
1988 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1989 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1991 if (new_defines_function)
1992 /* If defining a function declared with other language
1993 linkage, use the previously declared language linkage. */
1994 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1995 else if (types_match)
1997 /* If redeclaring a builtin function, and not a definition,
1998 it stays built in. */
1999 if (DECL_BUILT_IN (olddecl))
2001 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2002 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2003 /* If we're keeping the built-in definition, keep the rtl,
2004 regardless of declaration matches. */
2005 COPY_DECL_RTL (olddecl, newdecl);
2008 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2009 /* Don't clear out the arguments if we're redefining a function. */
2010 if (DECL_ARGUMENTS (olddecl))
2011 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2014 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2015 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2017 /* Now preserve various other info from the definition. */
2018 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2019 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2020 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2021 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2023 /* Warn about conflicting visibility specifications. */
2024 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2025 && DECL_VISIBILITY_SPECIFIED (newdecl)
2026 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2028 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2029 "because it", newdecl);
2030 warning (OPT_Wattributes, "%Jconflicts with previous "
2031 "declaration here", olddecl);
2033 /* Choose the declaration which specified visibility. */
2034 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2036 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2037 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2039 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2040 so keep this behavior. */
2041 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2043 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2044 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2047 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2048 with that from NEWDECL below. */
2049 if (DECL_LANG_SPECIFIC (olddecl))
2051 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2052 != DECL_LANG_SPECIFIC (newdecl));
2053 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2056 /* Merge the USED information. */
2057 if (TREE_USED (olddecl))
2058 TREE_USED (newdecl) = 1;
2059 else if (TREE_USED (newdecl))
2060 TREE_USED (olddecl) = 1;
2062 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2066 function_size = sizeof (struct tree_decl_common);
2068 memcpy ((char *) olddecl + sizeof (struct tree_common),
2069 (char *) newdecl + sizeof (struct tree_common),
2070 function_size - sizeof (struct tree_common));
2072 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2073 (char *) newdecl + sizeof (struct tree_decl_common),
2074 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2076 /* If newdecl is a template instantiation, it is possible that
2077 the following sequence of events has occurred:
2079 o A friend function was declared in a class template. The
2080 class template was instantiated.
2082 o The instantiation of the friend declaration was
2083 recorded on the instantiation list, and is newdecl.
2085 o Later, however, instantiate_class_template called pushdecl
2086 on the newdecl to perform name injection. But, pushdecl in
2087 turn called duplicate_decls when it discovered that another
2088 declaration of a global function with the same name already
2091 o Here, in duplicate_decls, we decided to clobber newdecl.
2093 If we're going to do that, we'd better make sure that
2094 olddecl, and not newdecl, is on the list of
2095 instantiations so that if we try to do the instantiation
2096 again we won't get the clobbered declaration. */
2097 reregister_specialization (newdecl,
2103 size_t size = tree_code_size (TREE_CODE (olddecl));
2104 memcpy ((char *) olddecl + sizeof (struct tree_common),
2105 (char *) newdecl + sizeof (struct tree_common),
2106 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2107 switch (TREE_CODE (olddecl))
2117 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2118 (char *) newdecl + sizeof (struct tree_decl_common),
2119 size - sizeof (struct tree_decl_common)
2120 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2124 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2125 (char *) newdecl + sizeof (struct tree_decl_common),
2126 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2127 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2131 DECL_UID (olddecl) = olddecl_uid;
2133 DECL_FRIEND_P (olddecl) = 1;
2136 DECL_ANTICIPATED (olddecl) = 1;
2137 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2140 /* NEWDECL contains the merged attribute lists.
2141 Update OLDDECL to be the same. */
2142 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2144 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2145 so that encode_section_info has a chance to look at the new decl
2146 flags and attributes. */
2147 if (DECL_RTL_SET_P (olddecl)
2148 && (TREE_CODE (olddecl) == FUNCTION_DECL
2149 || (TREE_CODE (olddecl) == VAR_DECL
2150 && TREE_STATIC (olddecl))))
2151 make_decl_rtl (olddecl);
2153 /* The NEWDECL will no longer be needed. Because every out-of-class
2154 declaration of a member results in a call to duplicate_decls,
2155 freeing these nodes represents in a significant savings. */
2161 /* Return zero if the declaration NEWDECL is valid
2162 when the declaration OLDDECL (assumed to be for the same name)
2163 has already been seen.
2164 Otherwise return an error message format string with a %s
2165 where the identifier should go. */
2168 redeclaration_error_message (tree newdecl, tree olddecl)
2170 if (TREE_CODE (newdecl) == TYPE_DECL)
2172 /* Because C++ can put things into name space for free,
2173 constructs like "typedef struct foo { ... } foo"
2174 would look like an erroneous redeclaration. */
2175 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2178 return "redefinition of %q#D";
2180 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2182 /* If this is a pure function, its olddecl will actually be
2183 the original initialization to `0' (which we force to call
2184 abort()). Don't complain about redefinition in this case. */
2185 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2186 && DECL_INITIAL (olddecl) == NULL_TREE)
2189 /* If both functions come from different namespaces, this is not
2190 a redeclaration - this is a conflict with a used function. */
2191 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2192 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2193 && ! decls_match (olddecl, newdecl))
2194 return "%qD conflicts with used function";
2196 /* We'll complain about linkage mismatches in
2197 warn_extern_redeclared_static. */
2199 /* Defining the same name twice is no good. */
2200 if (DECL_INITIAL (olddecl) != NULL_TREE
2201 && DECL_INITIAL (newdecl) != NULL_TREE)
2203 if (DECL_NAME (olddecl) == NULL_TREE)
2204 return "%q#D not declared in class";
2205 else if (!GNU_INLINE_P (olddecl)
2206 || GNU_INLINE_P (newdecl))
2207 return "redefinition of %q#D";
2210 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2212 bool olda = GNU_INLINE_P (olddecl);
2213 bool newa = GNU_INLINE_P (newdecl);
2218 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2220 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2226 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2230 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2232 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2233 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2234 return "redefinition of %q#D";
2238 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2239 || (DECL_TEMPLATE_RESULT (newdecl)
2240 == DECL_TEMPLATE_RESULT (olddecl)))
2243 nt = DECL_TEMPLATE_RESULT (newdecl);
2244 if (DECL_TEMPLATE_INFO (nt))
2245 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2246 ot = DECL_TEMPLATE_RESULT (olddecl);
2247 if (DECL_TEMPLATE_INFO (ot))
2248 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2249 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2250 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2251 return "redefinition of %q#D";
2253 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2255 bool olda = GNU_INLINE_P (ot);
2256 bool newa = GNU_INLINE_P (nt);
2261 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2263 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2267 /* Core issue #226 (C++0x):
2269 If a friend function template declaration specifies a
2270 default template-argument, that declaration shall be a
2271 definition and shall be the only declaration of the
2272 function template in the translation unit. */
2273 if ((cxx_dialect != cxx98)
2274 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2275 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2276 /*is_primary=*/1, /*is_partial=*/0,
2277 /*is_friend_decl=*/2))
2278 return "redeclaration of friend %q#D may not have default template arguments";
2282 else if (TREE_CODE (newdecl) == VAR_DECL
2283 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2284 && (! DECL_LANG_SPECIFIC (olddecl)
2285 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2286 || DECL_THREAD_LOCAL_P (newdecl)))
2288 /* Only variables can be thread-local, and all declarations must
2289 agree on this property. */
2290 if (DECL_THREAD_LOCAL_P (newdecl))
2291 return "thread-local declaration of %q#D follows "
2292 "non-thread-local declaration";
2294 return "non-thread-local declaration of %q#D follows "
2295 "thread-local declaration";
2297 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2299 /* The objects have been declared at namespace scope. If either
2300 is a member of an anonymous union, then this is an invalid
2301 redeclaration. For example:
2307 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2308 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2309 return "redeclaration of %q#D";
2310 /* If at least one declaration is a reference, there is no
2311 conflict. For example:
2317 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2319 /* Reject two definitions. */
2320 return "redefinition of %q#D";
2324 /* Objects declared with block scope: */
2325 /* Reject two definitions, and reject a definition
2326 together with an external reference. */
2327 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2328 return "redeclaration of %q#D";
2333 /* Hash and equality functions for the named_label table. */
2336 named_label_entry_hash (const void *data)
2338 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2339 return DECL_UID (ent->label_decl);
2343 named_label_entry_eq (const void *a, const void *b)
2345 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2346 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2347 return ent_a->label_decl == ent_b->label_decl;
2350 /* Create a new label, named ID. */
2353 make_label_decl (tree id, int local_p)
2355 struct named_label_entry *ent;
2359 decl = build_decl (LABEL_DECL, id, void_type_node);
2361 DECL_CONTEXT (decl) = current_function_decl;
2362 DECL_MODE (decl) = VOIDmode;
2363 C_DECLARED_LABEL_FLAG (decl) = local_p;
2365 /* Say where one reference is to the label, for the sake of the
2366 error if it is not defined. */
2367 DECL_SOURCE_LOCATION (decl) = input_location;
2369 /* Record the fact that this identifier is bound to this label. */
2370 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2372 /* Create the label htab for the function on demand. */
2374 named_labels = htab_create_ggc (13, named_label_entry_hash,
2375 named_label_entry_eq, NULL);
2377 /* Record this label on the list of labels used in this function.
2378 We do this before calling make_label_decl so that we get the
2379 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2380 ent = GGC_CNEW (struct named_label_entry);
2381 ent->label_decl = decl;
2383 slot = htab_find_slot (named_labels, ent, INSERT);
2384 gcc_assert (*slot == NULL);
2390 /* Look for a label named ID in the current function. If one cannot
2391 be found, create one. (We keep track of used, but undefined,
2392 labels, and complain about them at the end of a function.) */
2395 lookup_label (tree id)
2399 timevar_push (TV_NAME_LOOKUP);
2400 /* You can't use labels at global scope. */
2401 if (current_function_decl == NULL_TREE)
2403 error ("label %qE referenced outside of any function", id);
2404 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2407 /* See if we've already got this label. */
2408 decl = IDENTIFIER_LABEL_VALUE (id);
2409 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2410 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2412 decl = make_label_decl (id, /*local_p=*/0);
2413 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2416 /* Declare a local label named ID. */
2419 declare_local_label (tree id)
2423 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2424 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2425 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2426 current_binding_level->shadowed_labels);
2427 current_binding_level->shadowed_labels = shadow;
2429 decl = make_label_decl (id, /*local_p=*/1);
2430 TREE_VALUE (shadow) = decl;
2435 /* Returns nonzero if it is ill-formed to jump past the declaration of
2436 DECL. Returns 2 if it's also a real problem. */
2439 decl_jump_unsafe (tree decl)
2441 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2442 || TREE_TYPE (decl) == error_mark_node)
2445 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2446 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2449 if (pod_type_p (TREE_TYPE (decl)))
2452 /* The POD stuff is just pedantry; why should it matter if the class
2453 contains a field of pointer to member type? */
2457 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2460 identify_goto (tree decl, const location_t *locus)
2463 permerror (input_location, "jump to label %qD", decl);
2465 permerror (input_location, "jump to case label");
2467 permerror (input_location, "%H from here", locus);
2470 /* Check that a single previously seen jump to a newly defined label
2471 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2472 the jump context; NAMES are the names in scope in LEVEL at the jump
2473 context; LOCUS is the source position of the jump or 0. Returns
2474 true if all is well. */
2477 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2478 bool exited_omp, const location_t *locus)
2480 struct cp_binding_level *b;
2481 bool identified = false, saw_eh = false, saw_omp = false;
2485 identify_goto (decl, locus);
2486 error (" exits OpenMP structured block");
2487 identified = saw_omp = true;
2490 for (b = current_binding_level; b ; b = b->level_chain)
2492 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2494 for (new_decls = b->names; new_decls != old_decls;
2495 new_decls = TREE_CHAIN (new_decls))
2497 int problem = decl_jump_unsafe (new_decls);
2503 identify_goto (decl, locus);
2507 error (" crosses initialization of %q+#D", new_decls);
2509 permerror (input_location, " enters scope of non-POD %q+#D", new_decls);
2514 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2518 identify_goto (decl, locus);
2521 if (b->kind == sk_try)
2522 error (" enters try block");
2524 error (" enters catch block");
2527 if (b->kind == sk_omp && !saw_omp)
2531 identify_goto (decl, locus);
2534 error (" enters OpenMP structured block");
2543 check_previous_goto (tree decl, struct named_label_use_entry *use)
2545 check_previous_goto_1 (decl, use->binding_level,
2546 use->names_in_scope, use->in_omp_scope,
2547 &use->o_goto_locus);
2551 check_switch_goto (struct cp_binding_level* level)
2553 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2556 /* Check that a new jump to a label DECL is OK. Called by
2557 finish_goto_stmt. */
2560 check_goto (tree decl)
2562 struct named_label_entry *ent, dummy;
2563 bool saw_catch = false, identified = false;
2566 /* We can't know where a computed goto is jumping.
2567 So we assume that it's OK. */
2568 if (TREE_CODE (decl) != LABEL_DECL)
2571 /* We didn't record any information about this label when we created it,
2572 and there's not much point since it's trivial to analyze as a return. */
2573 if (decl == cdtor_label)
2576 dummy.label_decl = decl;
2577 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2578 gcc_assert (ent != NULL);
2580 /* If the label hasn't been defined yet, defer checking. */
2581 if (! DECL_INITIAL (decl))
2583 struct named_label_use_entry *new_use;
2585 /* Don't bother creating another use if the last goto had the
2586 same data, and will therefore create the same set of errors. */
2588 && ent->uses->names_in_scope == current_binding_level->names)
2591 new_use = GGC_NEW (struct named_label_use_entry);
2592 new_use->binding_level = current_binding_level;
2593 new_use->names_in_scope = current_binding_level->names;
2594 new_use->o_goto_locus = input_location;
2595 new_use->in_omp_scope = false;
2597 new_use->next = ent->uses;
2598 ent->uses = new_use;
2602 if (ent->in_try_scope || ent->in_catch_scope
2603 || ent->in_omp_scope || ent->bad_decls)
2605 permerror (input_location, "jump to label %q+D", decl);
2606 permerror (input_location, " from here");
2610 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2612 tree b = TREE_VALUE (bad);
2613 int u = decl_jump_unsafe (b);
2615 if (u > 1 && DECL_ARTIFICIAL (b))
2617 /* Can't skip init of __exception_info. */
2618 error ("%J enters catch block", b);
2622 error (" skips initialization of %q+#D", b);
2624 permerror (input_location, " enters scope of non-POD %q+#D", b);
2627 if (ent->in_try_scope)
2628 error (" enters try block");
2629 else if (ent->in_catch_scope && !saw_catch)
2630 error (" enters catch block");
2632 if (ent->in_omp_scope)
2633 error (" enters OpenMP structured block");
2634 else if (flag_openmp)
2636 struct cp_binding_level *b;
2637 for (b = current_binding_level; b ; b = b->level_chain)
2639 if (b == ent->binding_level)
2641 if (b->kind == sk_omp)
2645 permerror (input_location, "jump to label %q+D", decl);
2646 permerror (input_location, " from here");
2649 error (" exits OpenMP structured block");
2656 /* Check that a return is ok wrt OpenMP structured blocks.
2657 Called by finish_return_stmt. Returns true if all is well. */
2660 check_omp_return (void)
2662 struct cp_binding_level *b;
2663 for (b = current_binding_level; b ; b = b->level_chain)
2664 if (b->kind == sk_omp)
2666 error ("invalid exit from OpenMP structured block");
2672 /* Define a label, specifying the location in the source file.
2673 Return the LABEL_DECL node for the label. */
2676 define_label (location_t location, tree name)
2678 struct named_label_entry *ent, dummy;
2679 struct cp_binding_level *p;
2682 timevar_push (TV_NAME_LOOKUP);
2684 decl = lookup_label (name);
2686 dummy.label_decl = decl;
2687 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2688 gcc_assert (ent != NULL);
2690 /* After labels, make any new cleanups in the function go into their
2691 own new (temporary) binding contour. */
2692 for (p = current_binding_level;
2693 p->kind != sk_function_parms;
2695 p->more_cleanups_ok = 0;
2697 if (name == get_identifier ("wchar_t"))
2698 permerror (input_location, "label named wchar_t");
2700 if (DECL_INITIAL (decl) != NULL_TREE)
2702 error ("duplicate label %qD", decl);
2703 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2707 struct named_label_use_entry *use;
2709 /* Mark label as having been defined. */
2710 DECL_INITIAL (decl) = error_mark_node;
2711 /* Say where in the source. */
2712 DECL_SOURCE_LOCATION (decl) = location;
2714 ent->binding_level = current_binding_level;
2715 ent->names_in_scope = current_binding_level->names;
2717 for (use = ent->uses; use ; use = use->next)
2718 check_previous_goto (decl, use);
2722 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2727 struct cp_binding_level *level;
2728 struct cp_switch *next;
2729 /* The SWITCH_STMT being built. */
2731 /* A splay-tree mapping the low element of a case range to the high
2732 element, or NULL_TREE if there is no high element. Used to
2733 determine whether or not a new case label duplicates an old case
2734 label. We need a tree, rather than simply a hash table, because
2735 of the GNU case range extension. */
2739 /* A stack of the currently active switch statements. The innermost
2740 switch statement is on the top of the stack. There is no need to
2741 mark the stack for garbage collection because it is only active
2742 during the processing of the body of a function, and we never
2743 collect at that point. */
2745 static struct cp_switch *switch_stack;
2747 /* Called right after a switch-statement condition is parsed.
2748 SWITCH_STMT is the switch statement being parsed. */
2751 push_switch (tree switch_stmt)
2753 struct cp_switch *p = XNEW (struct cp_switch);
2754 p->level = current_binding_level;
2755 p->next = switch_stack;
2756 p->switch_stmt = switch_stmt;
2757 p->cases = splay_tree_new (case_compare, NULL, NULL);
2764 struct cp_switch *cs = switch_stack;
2765 location_t switch_location;
2767 /* Emit warnings as needed. */
2768 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2769 switch_location = EXPR_LOCATION (cs->switch_stmt);
2771 switch_location = input_location;
2772 if (!processing_template_decl)
2773 c_do_switch_warnings (cs->cases, switch_location,
2774 SWITCH_STMT_TYPE (cs->switch_stmt),
2775 SWITCH_STMT_COND (cs->switch_stmt));
2777 splay_tree_delete (cs->cases);
2778 switch_stack = switch_stack->next;
2782 /* Note that we've seen a definition of a case label, and complain if this
2783 is a bad place for one. */
2786 finish_case_label (tree low_value, tree high_value)
2789 struct cp_binding_level *p;
2791 if (processing_template_decl)
2795 /* For templates, just add the case label; we'll do semantic
2796 analysis at instantiation-time. */
2797 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2798 return add_stmt (build_case_label (low_value, high_value, label));
2801 /* Find the condition on which this switch statement depends. */
2802 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2803 if (cond && TREE_CODE (cond) == TREE_LIST)
2804 cond = TREE_VALUE (cond);
2806 if (!check_switch_goto (switch_stack->level))
2807 return error_mark_node;
2809 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2810 low_value, high_value);
2812 /* After labels, make any new cleanups in the function go into their
2813 own new (temporary) binding contour. */
2814 for (p = current_binding_level;
2815 p->kind != sk_function_parms;
2817 p->more_cleanups_ok = 0;
2822 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2825 typename_hash (const void* k)
2828 const_tree const t = (const_tree) k;
2830 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2831 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2836 typedef struct typename_info {
2844 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2845 really of type `typename_info*' */
2848 typename_compare (const void * k1, const void * k2)
2850 const_tree const t1 = (const_tree) k1;
2851 const typename_info *const t2 = (const typename_info *) k2;
2853 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2854 && TYPE_CONTEXT (t1) == t2->scope
2855 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2856 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2857 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2860 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2861 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2863 Returns the new TYPENAME_TYPE. */
2865 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2868 build_typename_type (tree context, tree name, tree fullname,
2869 enum tag_types tag_type)
2877 if (typename_htab == NULL)
2878 typename_htab = htab_create_ggc (61, &typename_hash,
2879 &typename_compare, NULL);
2881 ti.scope = FROB_CONTEXT (context);
2883 ti.template_id = fullname;
2884 ti.enum_p = tag_type == enum_type;
2885 ti.class_p = (tag_type == class_type
2886 || tag_type == record_type
2887 || tag_type == union_type);
2888 hash = (htab_hash_pointer (ti.scope)
2889 ^ htab_hash_pointer (ti.name));
2891 /* See if we already have this type. */
2892 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2897 /* Build the TYPENAME_TYPE. */
2898 t = cxx_make_type (TYPENAME_TYPE);
2899 TYPE_CONTEXT (t) = ti.scope;
2900 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2901 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2902 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2904 /* Build the corresponding TYPE_DECL. */
2905 d = build_decl (TYPE_DECL, name, t);
2906 TYPE_NAME (TREE_TYPE (d)) = d;
2907 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2908 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2909 DECL_ARTIFICIAL (d) = 1;
2911 /* Store it in the hash table. */
2914 /* TYPENAME_TYPEs must always be compared structurally, because
2915 they may or may not resolve down to another type depending on
2916 the currently open classes. */
2917 SET_TYPE_STRUCTURAL_EQUALITY (t);
2923 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2924 provided to name the type. Returns an appropriate type, unless an
2925 error occurs, in which case error_mark_node is returned. If we
2926 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2927 return that, rather than the _TYPE it corresponds to, in other
2928 cases we look through the type decl. If TF_ERROR is set, complain
2929 about errors, otherwise be quiet. */
2932 make_typename_type (tree context, tree name, enum tag_types tag_type,
2933 tsubst_flags_t complain)
2939 if (name == error_mark_node
2940 || context == NULL_TREE
2941 || context == error_mark_node)
2942 return error_mark_node;
2946 if (!(TYPE_LANG_SPECIFIC (name)
2947 && (CLASSTYPE_IS_TEMPLATE (name)
2948 || CLASSTYPE_USE_TEMPLATE (name))))
2949 name = TYPE_IDENTIFIER (name);
2951 /* Create a TEMPLATE_ID_EXPR for the type. */
2952 name = build_nt (TEMPLATE_ID_EXPR,
2953 CLASSTYPE_TI_TEMPLATE (name),
2954 CLASSTYPE_TI_ARGS (name));
2956 else if (TREE_CODE (name) == TYPE_DECL)
2957 name = DECL_NAME (name);
2961 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2963 name = TREE_OPERAND (name, 0);
2964 if (TREE_CODE (name) == TEMPLATE_DECL)
2965 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2966 else if (TREE_CODE (name) == OVERLOAD)
2968 error ("%qD is not a type", name);
2969 return error_mark_node;
2972 if (TREE_CODE (name) == TEMPLATE_DECL)
2974 error ("%qD used without template parameters", name);
2975 return error_mark_node;
2977 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2978 gcc_assert (TYPE_P (context));
2980 if (!MAYBE_CLASS_TYPE_P (context))
2982 if (complain & tf_error)
2983 error ("%q#T is not a class", context);
2984 return error_mark_node;
2987 /* When the CONTEXT is a dependent type, NAME could refer to a
2988 dependent base class of CONTEXT. But look inside it anyway
2989 if CONTEXT is a currently open scope, in case it refers to a
2990 member of the current instantiation or a non-dependent base;
2991 lookup will stop when we hit a dependent base. */
2992 if (!dependent_scope_p (context))
2993 /* We should only set WANT_TYPE when we're a nested typename type.
2994 Then we can give better diagnostics if we find a non-type. */
2995 t = lookup_field (context, name, 0, /*want_type=*/true);
2999 if (!t && dependent_type_p (context))
3000 return build_typename_type (context, name, fullname, tag_type);
3002 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3006 if (complain & tf_error)
3007 error (want_template ? "no class template named %q#T in %q#T"
3008 : "no type named %q#T in %q#T", name, context);
3009 return error_mark_node;
3012 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3014 if (complain & tf_error)
3015 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3017 return error_mark_node;
3019 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3021 if (complain & tf_error)
3022 error ("%<typename %T::%D%> names %q#T, which is not a type",
3024 return error_mark_node;
3027 if (complain & tf_error)
3028 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3031 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3033 /*entering_scope=*/0,
3034 tf_warning_or_error | tf_user);
3036 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3042 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3043 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3044 in which case error_mark_node is returned.
3046 If PARM_LIST is non-NULL, also make sure that the template parameter
3047 list of TEMPLATE_DECL matches.
3049 If COMPLAIN zero, don't complain about any errors that occur. */
3052 make_unbound_class_template (tree context, tree name, tree parm_list,
3053 tsubst_flags_t complain)
3059 name = TYPE_IDENTIFIER (name);
3060 else if (DECL_P (name))
3061 name = DECL_NAME (name);
3062 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3064 if (!dependent_type_p (context)
3065 || currently_open_class (context))
3067 tree tmpl = NULL_TREE;
3069 if (MAYBE_CLASS_TYPE_P (context))
3070 tmpl = lookup_field (context, name, 0, false);
3072 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3074 if (complain & tf_error)
3075 error ("no class template named %q#T in %q#T", name, context);
3076 return error_mark_node;
3080 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3082 if (complain & tf_error)
3084 error ("template parameters do not match template");
3085 error ("%q+D declared here", tmpl);
3087 return error_mark_node;
3090 if (complain & tf_error)
3091 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3096 /* Build the UNBOUND_CLASS_TEMPLATE. */
3097 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3098 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3099 TREE_TYPE (t) = NULL_TREE;
3100 SET_TYPE_STRUCTURAL_EQUALITY (t);
3102 /* Build the corresponding TEMPLATE_DECL. */
3103 d = build_decl (TEMPLATE_DECL, name, t);
3104 TYPE_NAME (TREE_TYPE (d)) = d;
3105 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3106 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3107 DECL_ARTIFICIAL (d) = 1;
3108 DECL_TEMPLATE_PARMS (d) = parm_list;
3115 /* Push the declarations of builtin types into the namespace.
3116 RID_INDEX is the index of the builtin type in the array
3117 RID_POINTERS. NAME is the name used when looking up the builtin
3118 type. TYPE is the _TYPE node for the builtin type. */
3121 record_builtin_type (enum rid rid_index,
3125 tree rname = NULL_TREE, tname = NULL_TREE;
3126 tree tdecl = NULL_TREE;
3128 if ((int) rid_index < (int) RID_MAX)
3129 rname = ridpointers[(int) rid_index];
3131 tname = get_identifier (name);
3133 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3134 eliminated. Built-in types should not be looked up name; their
3135 names are keywords that the parser can recognize. However, there
3136 is code in c-common.c that uses identifier_global_value to look
3137 up built-in types by name. */
3140 tdecl = build_decl (TYPE_DECL, tname, type);
3141 DECL_ARTIFICIAL (tdecl) = 1;
3142 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3148 tdecl = build_decl (TYPE_DECL, rname, type);
3149 DECL_ARTIFICIAL (tdecl) = 1;
3151 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3154 if (!TYPE_NAME (type))
3155 TYPE_NAME (type) = tdecl;
3158 debug_hooks->type_decl (tdecl, 0);
3161 /* Record one of the standard Java types.
3162 * Declare it as having the given NAME.
3163 * If SIZE > 0, it is the size of one of the integral types;
3164 * otherwise it is the negative of the size of one of the other types. */
3167 record_builtin_java_type (const char* name, int size)
3171 type = make_signed_type (size);
3172 else if (size > -32)
3173 { /* "__java_char" or ""__java_boolean". */
3174 type = make_unsigned_type (-size);
3175 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3178 { /* "__java_float" or ""__java_double". */
3179 type = make_node (REAL_TYPE);
3180 TYPE_PRECISION (type) = - size;
3183 record_builtin_type (RID_MAX, name, type);
3184 decl = TYPE_NAME (type);
3186 /* Suppress generate debug symbol entries for these types,
3187 since for normal C++ they are just clutter.
3188 However, push_lang_context undoes this if extern "Java" is seen. */
3189 DECL_IGNORED_P (decl) = 1;
3191 TYPE_FOR_JAVA (type) = 1;
3195 /* Push a type into the namespace so that the back ends ignore it. */
3198 record_unknown_type (tree type, const char* name)
3200 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3201 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3202 DECL_IGNORED_P (decl) = 1;
3203 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3204 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3205 TYPE_ALIGN (type) = 1;
3206 TYPE_USER_ALIGN (type) = 0;
3207 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3210 /* A string for which we should create an IDENTIFIER_NODE at
3213 typedef struct predefined_identifier
3215 /* The name of the identifier. */
3216 const char *const name;
3217 /* The place where the IDENTIFIER_NODE should be stored. */
3219 /* Nonzero if this is the name of a constructor or destructor. */
3220 const int ctor_or_dtor_p;
3221 } predefined_identifier;
3223 /* Create all the predefined identifiers. */
3226 initialize_predefined_identifiers (void)
3228 const predefined_identifier *pid;
3230 /* A table of identifiers to create at startup. */
3231 static const predefined_identifier predefined_identifiers[] = {
3232 { "C++", &lang_name_cplusplus, 0 },
3233 { "C", &lang_name_c, 0 },
3234 { "Java", &lang_name_java, 0 },
3235 /* Some of these names have a trailing space so that it is
3236 impossible for them to conflict with names written by users. */
3237 { "__ct ", &ctor_identifier, 1 },
3238 { "__base_ctor ", &base_ctor_identifier, 1 },
3239 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3240 { "__dt ", &dtor_identifier, 1 },
3241 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3242 { "__base_dtor ", &base_dtor_identifier, 1 },
3243 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3244 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3245 { "nelts", &nelts_identifier, 0 },
3246 { THIS_NAME, &this_identifier, 0 },
3247 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3248 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3249 { "_vptr", &vptr_identifier, 0 },
3250 { "__vtt_parm", &vtt_parm_identifier, 0 },
3251 { "::", &global_scope_name, 0 },
3252 { "std", &std_identifier, 0 },
3256 for (pid = predefined_identifiers; pid->name; ++pid)
3258 *pid->node = get_identifier (pid->name);
3259 if (pid->ctor_or_dtor_p)
3260 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3264 /* Create the predefined scalar types of C,
3265 and some nodes representing standard constants (0, 1, (void *)0).
3266 Initialize the global binding level.
3267 Make definitions for built-in primitive functions. */
3270 cxx_init_decl_processing (void)
3273 tree void_ftype_ptr;
3275 build_common_tree_nodes (flag_signed_char, false);
3277 /* Create all the identifiers we need. */
3278 initialize_predefined_identifiers ();
3280 /* Create the global variables. */
3281 push_to_top_level ();
3283 current_function_decl = NULL_TREE;
3284 current_binding_level = NULL;
3285 /* Enter the global namespace. */
3286 gcc_assert (global_namespace == NULL_TREE);
3287 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3289 TREE_PUBLIC (global_namespace) = 1;
3290 begin_scope (sk_namespace, global_namespace);
3292 current_lang_name = NULL_TREE;
3294 if (flag_visibility_ms_compat)
3295 default_visibility = VISIBILITY_HIDDEN;
3298 current_lang_name = lang_name_c;
3300 /* Create the `std' namespace. */
3301 push_namespace (std_identifier);
3302 std_node = current_namespace;
3305 c_common_nodes_and_builtins ();
3307 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3308 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3309 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3310 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3311 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3312 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3313 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3314 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3316 integer_two_node = build_int_cst (NULL_TREE, 2);
3317 integer_three_node = build_int_cst (NULL_TREE, 3);
3319 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3320 truthvalue_type_node = boolean_type_node;
3321 truthvalue_false_node = boolean_false_node;
3322 truthvalue_true_node = boolean_true_node;
3324 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3327 record_builtin_type (RID_MAX, NULL, string_type_node);
3330 delta_type_node = ptrdiff_type_node;
3331 vtable_index_type = ptrdiff_type_node;
3333 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3334 void_ftype = build_function_type (void_type_node, void_list_node);
3335 void_ftype_ptr = build_function_type (void_type_node,
3336 tree_cons (NULL_TREE,
3340 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3342 /* C++ extensions */
3344 unknown_type_node = make_node (UNKNOWN_TYPE);
3345 record_unknown_type (unknown_type_node, "unknown type");
3347 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3348 TREE_TYPE (unknown_type_node) = unknown_type_node;
3350 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3352 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3353 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3355 init_list_type_node = make_node (UNKNOWN_TYPE);
3356 record_unknown_type (init_list_type_node, "init list");
3359 /* Make sure we get a unique function type, so we can give
3360 its pointer type a name. (This wins for gdb.) */
3361 tree vfunc_type = make_node (FUNCTION_TYPE);
3362 TREE_TYPE (vfunc_type) = integer_type_node;
3363 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3364 layout_type (vfunc_type);
3366 vtable_entry_type = build_pointer_type (vfunc_type);
3368 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3371 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3372 layout_type (vtbl_type_node);
3373 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3374 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3375 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3376 layout_type (vtbl_ptr_type_node);
3377 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3379 push_namespace (get_identifier ("__cxxabiv1"));
3380 abi_node = current_namespace;
3383 global_type_node = make_node (LANG_TYPE);
3384 record_unknown_type (global_type_node, "global type");
3387 current_lang_name = lang_name_cplusplus;
3391 tree bad_alloc_type_node;
3392 tree bad_alloc_decl;
3393 tree newtype, deltype;
3394 tree ptr_ftype_sizetype;
3396 push_namespace (std_identifier);
3397 bad_alloc_id = get_identifier ("bad_alloc");
3398 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3399 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3401 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3402 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3403 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3407 = build_function_type (ptr_type_node,
3408 tree_cons (NULL_TREE,
3411 newtype = build_exception_variant
3412 (ptr_ftype_sizetype, add_exception_specifier
3413 (NULL_TREE, bad_alloc_type_node, -1));
3414 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3415 push_cp_library_fn (NEW_EXPR, newtype);
3416 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3417 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3418 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3422 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3424 /* Perform other language dependent initializations. */
3425 init_class_processing ();
3426 init_rtti_processing ();
3428 if (flag_exceptions)
3429 init_exception_processing ();
3431 if (! supports_one_only ())
3434 make_fname_decl = cp_make_fname_decl;
3435 start_fname_decls ();
3437 /* Show we use EH for cleanups. */
3438 if (flag_exceptions)
3439 using_eh_for_cleanups ();
3442 /* Generate an initializer for a function naming variable from
3443 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3444 filled in with the type of the init. */
3447 cp_fname_init (const char* name, tree *type_p)
3449 tree domain = NULL_TREE;
3451 tree init = NULL_TREE;
3456 length = strlen (name);
3457 domain = build_index_type (size_int (length));
3458 init = build_string (length + 1, name);
3461 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3462 type = build_cplus_array_type (type, domain);
3467 TREE_TYPE (init) = type;
3469 init = error_mark_node;
3474 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3475 decl, NAME is the initialization string and TYPE_DEP indicates whether
3476 NAME depended on the type of the function. We make use of that to detect
3477 __PRETTY_FUNCTION__ inside a template fn. This is being done
3478 lazily at the point of first use, so we mustn't push the decl now. */
3481 cp_make_fname_decl (tree id, int type_dep)
3483 const char *const name = (type_dep && processing_template_decl
3484 ? NULL : fname_as_string (type_dep));
3486 tree init = cp_fname_init (name, &type);
3487 tree decl = build_decl (VAR_DECL, id, type);
3490 free (CONST_CAST (char *, name));
3492 /* As we're using pushdecl_with_scope, we must set the context. */
3493 DECL_CONTEXT (decl) = current_function_decl;
3494 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3496 TREE_STATIC (decl) = 1;
3497 TREE_READONLY (decl) = 1;
3498 DECL_ARTIFICIAL (decl) = 1;
3500 TREE_USED (decl) = 1;
3502 if (current_function_decl)
3504 struct cp_binding_level *b = current_binding_level;
3505 while (b->level_chain->kind != sk_function_parms)
3507 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3508 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3509 LOOKUP_ONLYCONVERTING);
3512 pushdecl_top_level_and_finish (decl, init);
3518 builtin_function_1 (tree decl, tree context, bool is_global)
3520 tree id = DECL_NAME (decl);
3521 const char *name = IDENTIFIER_POINTER (id);
3523 retrofit_lang_decl (decl);
3525 /* All nesting of C++ functions is lexical; there is never a "static
3526 chain" in the sense of GNU C nested functions. */
3527 DECL_NO_STATIC_CHAIN (decl) = 1;
3529 DECL_ARTIFICIAL (decl) = 1;
3530 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3531 SET_DECL_LANGUAGE (decl, lang_c);
3532 /* Runtime library routines are, by definition, available in an
3533 external shared object. */
3534 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3535 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3537 DECL_CONTEXT (decl) = context;
3540 pushdecl_top_level (decl);
3544 /* A function in the user's namespace should have an explicit
3545 declaration before it is used. Mark the built-in function as
3546 anticipated but not actually declared. */
3547 if (name[0] != '_' || name[1] != '_')
3548 DECL_ANTICIPATED (decl) = 1;
3549 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3551 size_t len = strlen (name);
3553 /* Treat __*_chk fortification functions as anticipated as well,
3554 unless they are __builtin_*. */
3555 if (len > strlen ("___chk")
3556 && memcmp (name + len - strlen ("_chk"),
3557 "_chk", strlen ("_chk") + 1) == 0)
3558 DECL_ANTICIPATED (decl) = 1;
3565 cxx_builtin_function (tree decl)
3567 tree id = DECL_NAME (decl);
3568 const char *name = IDENTIFIER_POINTER (id);
3569 /* All builtins that don't begin with an '_' should additionally
3570 go in the 'std' namespace. */
3573 tree decl2 = copy_node(decl);
3574 push_namespace (std_identifier);
3575 builtin_function_1 (decl2, std_node, false);
3579 return builtin_function_1 (decl, NULL_TREE, false);
3582 /* Like cxx_builtin_function, but guarantee the function is added to the global
3583 scope. This is to allow function specific options to add new machine
3584 dependent builtins when the target ISA changes via attribute((target(...)))
3585 which saves space on program startup if the program does not use non-generic
3589 cxx_builtin_function_ext_scope (tree decl)
3592 tree id = DECL_NAME (decl);
3593 const char *name = IDENTIFIER_POINTER (id);
3594 /* All builtins that don't begin with an '_' should additionally
3595 go in the 'std' namespace. */
3598 tree decl2 = copy_node(decl);
3599 push_namespace (std_identifier);
3600 builtin_function_1 (decl2, std_node, true);
3604 return builtin_function_1 (decl, NULL_TREE, true);
3607 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3608 function. Not called directly. */
3611 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3613 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3614 DECL_EXTERNAL (fn) = 1;
3615 TREE_PUBLIC (fn) = 1;
3616 DECL_ARTIFICIAL (fn) = 1;
3617 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3618 SET_DECL_LANGUAGE (fn, lang_c);
3619 /* Runtime library routines are, by definition, available in an
3620 external shared object. */
3621 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3622 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3626 /* Returns the _DECL for a library function with C linkage.
3627 We assume that such functions never throw; if this is incorrect,
3628 callers should unset TREE_NOTHROW. */
3631 build_library_fn (tree name, tree type)
3633 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3634 TREE_NOTHROW (fn) = 1;
3638 /* Returns the _DECL for a library function with C++ linkage. */
3641 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3643 tree fn = build_library_fn_1 (name, operator_code, type);
3644 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3645 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3646 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3650 /* Like build_library_fn, but takes a C string instead of an
3654 build_library_fn_ptr (const char* name, tree type)
3656 return build_library_fn (get_identifier (name), type);
3659 /* Like build_cp_library_fn, but takes a C string instead of an
3663 build_cp_library_fn_ptr (const char* name, tree type)
3665 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3668 /* Like build_library_fn, but also pushes the function so that we will
3669 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3670 may throw exceptions listed in RAISES. */
3673 push_library_fn (tree name, tree type, tree raises)
3678 type = build_exception_variant (type, raises);
3680 fn = build_library_fn (name, type);
3681 pushdecl_top_level (fn);
3685 /* Like build_cp_library_fn, but also pushes the function so that it
3686 will be found by normal lookup. */
3689 push_cp_library_fn (enum tree_code operator_code, tree type)
3691 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3698 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3702 push_void_library_fn (tree name, tree parmtypes)
3704 tree type = build_function_type (void_type_node, parmtypes);
3705 return push_library_fn (name, type, NULL_TREE);
3708 /* Like push_library_fn, but also note that this function throws
3709 and does not return. Used for __throw_foo and the like. */
3712 push_throw_library_fn (tree name, tree type)
3714 tree fn = push_library_fn (name, type, NULL_TREE);
3715 TREE_THIS_VOLATILE (fn) = 1;
3716 TREE_NOTHROW (fn) = 0;
3720 /* When we call finish_struct for an anonymous union, we create
3721 default copy constructors and such. But, an anonymous union
3722 shouldn't have such things; this function undoes the damage to the
3723 anonymous union type T.
3725 (The reason that we create the synthesized methods is that we don't
3726 distinguish `union { int i; }' from `typedef union { int i; } U'.
3727 The first is an anonymous union; the second is just an ordinary
3731 fixup_anonymous_aggr (tree t)
3735 /* Wipe out memory of synthesized methods. */
3736 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3737 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3738 TYPE_HAS_INIT_REF (t) = 0;
3739 TYPE_HAS_CONST_INIT_REF (t) = 0;
3740 TYPE_HAS_ASSIGN_REF (t) = 0;
3741 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3743 /* Splice the implicitly generated functions out of the TYPE_METHODS
3745 q = &TYPE_METHODS (t);
3748 if (DECL_ARTIFICIAL (*q))
3749 *q = TREE_CHAIN (*q);
3751 q = &TREE_CHAIN (*q);
3754 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3755 if (TYPE_METHODS (t))
3757 tree decl = TYPE_MAIN_DECL (t);
3759 if (TREE_CODE (t) != UNION_TYPE)
3760 error ("%Jan anonymous struct cannot have function members", decl);
3762 error ("%Jan anonymous union cannot have function members", decl);
3765 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3766 assignment operators (because they cannot have these methods themselves).
3767 For anonymous unions this is already checked because they are not allowed
3768 in any union, otherwise we have to check it. */
3769 if (TREE_CODE (t) != UNION_TYPE)
3773 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3774 if (TREE_CODE (field) == FIELD_DECL)
3776 type = TREE_TYPE (field);
3777 if (CLASS_TYPE_P (type))
3779 if (TYPE_NEEDS_CONSTRUCTING (type))
3780 error ("member %q+#D with constructor not allowed "
3781 "in anonymous aggregate", field);
3782 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3783 error ("member %q+#D with destructor not allowed "
3784 "in anonymous aggregate", field);
3785 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3786 error ("member %q+#D with copy assignment operator "
3787 "not allowed in anonymous aggregate", field);
3793 /* Make sure that a declaration with no declarator is well-formed, i.e.
3794 just declares a tagged type or anonymous union.
3796 Returns the type declared; or NULL_TREE if none. */
3799 check_tag_decl (cp_decl_specifier_seq *declspecs)
3801 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3802 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3803 /* If a class, struct, or enum type is declared by the DECLSPECS
3804 (i.e, if a class-specifier, enum-specifier, or non-typename
3805 elaborated-type-specifier appears in the DECLSPECS),
3806 DECLARED_TYPE is set to the corresponding type. */
3807 tree declared_type = NULL_TREE;
3808 bool error_p = false;
3810 if (declspecs->multiple_types_p)
3811 error ("multiple types in one declaration");
3812 else if (declspecs->redefined_builtin_type)
3814 if (!in_system_header)
3815 permerror (input_location, "redeclaration of C++ built-in type %qT",
3816 declspecs->redefined_builtin_type);
3821 && TYPE_P (declspecs->type)
3822 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3823 && MAYBE_CLASS_TYPE_P (declspecs->type))
3824 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3825 declared_type = declspecs->type;
3826 else if (declspecs->type == error_mark_node)
3828 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3829 permerror (input_location, "declaration does not declare anything");
3830 /* Check for an anonymous union. */
3831 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3832 && TYPE_ANONYMOUS_P (declared_type))
3834 /* 7/3 In a simple-declaration, the optional init-declarator-list
3835 can be omitted only when declaring a class (clause 9) or
3836 enumeration (7.2), that is, when the decl-specifier-seq contains
3837 either a class-specifier, an elaborated-type-specifier with
3838 a class-key (9.1), or an enum-specifier. In these cases and
3839 whenever a class-specifier or enum-specifier is present in the
3840 decl-specifier-seq, the identifiers in these specifiers are among
3841 the names being declared by the declaration (as class-name,
3842 enum-names, or enumerators, depending on the syntax). In such
3843 cases, and except for the declaration of an unnamed bit-field (9.6),
3844 the decl-specifier-seq shall introduce one or more names into the
3845 program, or shall redeclare a name introduced by a previous
3846 declaration. [Example:
3847 enum { }; // ill-formed
3848 typedef class { }; // ill-formed
3852 error ("missing type-name in typedef-declaration");
3855 /* Anonymous unions are objects, so they can have specifiers. */;
3856 SET_ANON_AGGR_TYPE_P (declared_type);
3858 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3859 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3864 if (declspecs->specs[(int)ds_inline]
3865 || declspecs->specs[(int)ds_virtual])
3866 error ("%qs can only be specified for functions",
3867 declspecs->specs[(int)ds_inline]
3868 ? "inline" : "virtual");
3870 && (!current_class_type
3871 || current_scope () != current_class_type))
3872 error ("%<friend%> can only be specified inside a class");
3873 else if (declspecs->specs[(int)ds_explicit])
3874 error ("%<explicit%> can only be specified for constructors");
3875 else if (declspecs->storage_class)
3876 error ("a storage class can only be specified for objects "
3878 else if (declspecs->specs[(int)ds_const]
3879 || declspecs->specs[(int)ds_volatile]
3880 || declspecs->specs[(int)ds_restrict]
3881 || declspecs->specs[(int)ds_thread])
3882 error ("qualifiers can only be specified for objects "
3884 else if (saw_typedef)
3885 warning (0, "%<typedef%> was ignored in this declaration");
3888 return declared_type;
3891 /* Called when a declaration is seen that contains no names to declare.
3892 If its type is a reference to a structure, union or enum inherited
3893 from a containing scope, shadow that tag name for the current scope
3894 with a forward reference.
3895 If its type defines a new named structure or union
3896 or defines an enum, it is valid but we need not do anything here.
3897 Otherwise, it is an error.
3899 C++: may have to grok the declspecs to learn about static,
3900 complain for anonymous unions.
3902 Returns the TYPE declared -- or NULL_TREE if none. */
3905 shadow_tag (cp_decl_specifier_seq *declspecs)
3907 tree t = check_tag_decl (declspecs);
3912 if (declspecs->attributes)
3914 warning (0, "attribute ignored in declaration of %q+#T", t);
3915 warning (0, "attribute for %q+#T must follow the %qs keyword",
3916 t, class_key_or_enum_as_string (t));
3920 if (maybe_process_partial_specialization (t) == error_mark_node)
3923 /* This is where the variables in an anonymous union are
3924 declared. An anonymous union declaration looks like:
3926 because there is no declarator after the union, the parser
3927 sends that declaration here. */
3928 if (ANON_AGGR_TYPE_P (t))
3930 fixup_anonymous_aggr (t);
3932 if (TYPE_FIELDS (t))
3934 tree decl = grokdeclarator (/*declarator=*/NULL,
3935 declspecs, NORMAL, 0, NULL);
3936 finish_anon_union (decl);
3943 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3946 groktypename (cp_decl_specifier_seq *type_specifiers,
3947 const cp_declarator *declarator)
3951 attrs = type_specifiers->attributes;
3952 type_specifiers->attributes = NULL_TREE;
3953 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3954 if (attrs && type != error_mark_node)
3956 if (CLASS_TYPE_P (type))
3957 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3958 "outside of definition", type);
3959 else if (MAYBE_CLASS_TYPE_P (type))
3960 /* A template type parameter or other dependent type. */
3961 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3962 "type %qT without an associated declaration", type);
3964 cplus_decl_attributes (&type, attrs, 0);
3969 /* Process a DECLARATOR for a function-scope variable declaration,
3970 namespace-scope variable declaration, or function declaration.
3971 (Function definitions go through start_function; class member
3972 declarations appearing in the body of the class go through
3973 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3974 If an error occurs, the error_mark_node is returned instead.
3976 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
3977 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
3978 for an explicitly defaulted function, or SD_DELETED for an explicitly
3979 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
3980 implicitly initialized via a default constructor. ATTRIBUTES and
3981 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
3982 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
3983 set, the caller is responsible for calling pop_scope. */
3986 start_decl (const cp_declarator *declarator,
3987 cp_decl_specifier_seq *declspecs,
3990 tree prefix_attributes,
3991 tree *pushed_scope_p)
3999 *pushed_scope_p = NULL_TREE;
4001 /* An object declared as __attribute__((deprecated)) suppresses
4002 warnings of uses of other deprecated items. */
4003 if (lookup_attribute ("deprecated", attributes))
4004 deprecated_state = DEPRECATED_SUPPRESS;
4006 attributes = chainon (attributes, prefix_attributes);
4008 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4011 deprecated_state = DEPRECATED_NORMAL;
4013 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4014 || decl == error_mark_node)
4015 return error_mark_node;
4017 type = TREE_TYPE (decl);
4019 context = DECL_CONTEXT (decl);
4023 *pushed_scope_p = push_scope (context);
4025 /* We are only interested in class contexts, later. */
4026 if (TREE_CODE (context) == NAMESPACE_DECL)
4027 context = NULL_TREE;
4031 /* Is it valid for this decl to have an initializer at all?
4032 If not, set INITIALIZED to zero, which will indirectly
4033 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4034 switch (TREE_CODE (decl))
4037 error ("typedef %qD is initialized (use decltype instead)", decl);
4038 return error_mark_node;
4041 if (initialized == SD_DELETED)
4042 /* We'll handle the rest of the semantics later, but we need to
4043 set this now so it's visible to duplicate_decls. */
4044 DECL_DELETED_FN (decl) = 1;
4053 if (! toplevel_bindings_p ()
4054 && DECL_EXTERNAL (decl))
4055 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4057 DECL_EXTERNAL (decl) = 0;
4058 if (toplevel_bindings_p ())
4059 TREE_STATIC (decl) = 1;
4062 /* If this is a typedef that names the class for linkage purposes
4063 (7.1.3p8), apply any attributes directly to the type. */
4064 if (TREE_CODE (decl) == TYPE_DECL
4065 && TAGGED_TYPE_P (TREE_TYPE (decl))
4066 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4067 flags = ATTR_FLAG_TYPE_IN_PLACE;
4071 /* Set attributes here so if duplicate decl, will have proper attributes. */
4072 cplus_decl_attributes (&decl, attributes, flags);
4074 /* Dllimported symbols cannot be defined. Static data members (which
4075 can be initialized in-class and dllimported) go through grokfield,
4076 not here, so we don't need to exclude those decls when checking for
4078 if (initialized && DECL_DLLIMPORT_P (decl))
4080 error ("definition of %q#D is marked %<dllimport%>", decl);
4081 DECL_DLLIMPORT_P (decl) = 0;
4084 /* If #pragma weak was used, mark the decl weak now. */
4085 maybe_apply_pragma_weak (decl);
4087 if (TREE_CODE (decl) == FUNCTION_DECL
4088 && DECL_DECLARED_INLINE_P (decl)
4089 && DECL_UNINLINABLE (decl)
4090 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4091 warning (0, "inline function %q+D given attribute noinline", decl);
4093 if (context && COMPLETE_TYPE_P (complete_type (context)))
4095 if (TREE_CODE (decl) == VAR_DECL)
4097 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4098 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4099 error ("%q#D is not a static member of %q#T", decl, context);
4102 if (DECL_CONTEXT (field) != context)
4104 if (!same_type_p (DECL_CONTEXT (field), context))
4105 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4106 "to be defined as %<%T::%D%>",
4107 DECL_CONTEXT (field), DECL_NAME (decl),
4108 context, DECL_NAME (decl));
4109 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4111 if (processing_specialization
4112 && template_class_depth (context) == 0
4113 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4114 error ("template header not allowed in member definition "
4115 "of explicitly specialized class");
4116 /* Static data member are tricky; an in-class initialization
4117 still doesn't provide a definition, so the in-class
4118 declaration will have DECL_EXTERNAL set, but will have an
4119 initialization. Thus, duplicate_decls won't warn
4120 about this situation, and so we check here. */
4121 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4122 error ("duplicate initialization of %qD", decl);
4123 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4129 tree field = check_classfn (context, decl,
4130 (processing_template_decl
4131 > template_class_depth (context))
4132 ? current_template_parms
4134 if (field && field != error_mark_node
4135 && duplicate_decls (decl, field,
4136 /*newdecl_is_friend=*/false))
4140 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4141 DECL_IN_AGGR_P (decl) = 0;
4142 /* Do not mark DECL as an explicit specialization if it was not
4143 already marked as an instantiation; a declaration should
4144 never be marked as a specialization unless we know what
4145 template is being specialized. */
4146 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4148 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4150 /* [temp.expl.spec] An explicit specialization of a static data
4151 member of a template is a definition if the declaration
4152 includes an initializer; otherwise, it is a declaration.
4154 We check for processing_specialization so this only applies
4155 to the new specialization syntax. */
4156 if (!initialized && processing_specialization)
4157 DECL_EXTERNAL (decl) = 1;
4160 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4161 permerror (input_location, "declaration of %q#D outside of class is not definition",
4165 was_public = TREE_PUBLIC (decl);
4167 /* Enter this declaration into the symbol table. */
4168 decl = maybe_push_decl (decl);
4170 if (processing_template_decl)
4171 decl = push_template_decl (decl);
4172 if (decl == error_mark_node)
4173 return error_mark_node;
4175 /* Tell the back end to use or not use .common as appropriate. If we say
4176 -fconserve-space, we want this to save .data space, at the expense of
4177 wrong semantics. If we say -fno-conserve-space, we want this to
4178 produce errors about redefs; to do this we force variables into the
4180 if (flag_conserve_space
4181 && TREE_CODE (decl) == VAR_DECL
4182 && TREE_PUBLIC (decl)
4183 && !DECL_THREAD_LOCAL_P (decl)
4184 && !have_global_bss_p ())
4185 DECL_COMMON (decl) = 1;
4187 if (TREE_CODE (decl) == VAR_DECL
4188 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4189 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4191 /* This is a const variable with implicit 'static'. Set
4192 DECL_THIS_STATIC so we can tell it from variables that are
4193 !TREE_PUBLIC because of the anonymous namespace. */
4194 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4195 DECL_THIS_STATIC (decl) = 1;
4198 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4199 start_decl_1 (decl, initialized);
4204 /* Process the declaration of a variable DECL. INITIALIZED is true
4205 iff DECL is explicitly initialized. (INITIALIZED is false if the
4206 variable is initialized via an implicitly-called constructor.)
4207 This function must be called for ordinary variables (including, for
4208 example, implicit instantiations of templates), but must not be
4209 called for template declarations. */
4212 start_decl_1 (tree decl, bool initialized)
4216 bool aggregate_definition_p;
4218 gcc_assert (!processing_template_decl);
4220 if (error_operand_p (decl))
4223 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4225 type = TREE_TYPE (decl);
4226 complete_p = COMPLETE_TYPE_P (type);
4227 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4229 /* If an explicit initializer is present, or if this is a definition
4230 of an aggregate, then we need a complete type at this point.
4231 (Scalars are always complete types, so there is nothing to
4232 check.) This code just sets COMPLETE_P; errors (if necessary)
4233 are issued below. */
4234 if ((initialized || aggregate_definition_p)
4236 && COMPLETE_TYPE_P (complete_type (type)))
4239 /* We will not yet have set TREE_READONLY on DECL if the type
4240 was "const", but incomplete, before this point. But, now, we
4241 have a complete type, so we can try again. */
4242 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4246 /* Is it valid for this decl to have an initializer at all? */
4248 /* Don't allow initializations for incomplete types except for
4249 arrays which might be completed by the initialization. */
4251 ; /* A complete type is ok. */
4252 else if (type_uses_auto (type))
4253 ; /* An auto type is ok. */
4254 else if (TREE_CODE (type) != ARRAY_TYPE)
4256 error ("variable %q#D has initializer but incomplete type", decl);
4257 type = TREE_TYPE (decl) = error_mark_node;
4259 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4261 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4262 error ("elements of array %q#D have incomplete type", decl);
4263 /* else we already gave an error in start_decl. */
4266 else if (aggregate_definition_p && !complete_p)
4268 if (type_uses_auto (type))
4269 error ("declaration of %q#D has no initializer", decl);
4271 error ("aggregate %q#D has incomplete type and cannot be defined",
4273 /* Change the type so that assemble_variable will give
4274 DECL an rtl we can live with: (mem (const_int 0)). */
4275 type = TREE_TYPE (decl) = error_mark_node;
4278 /* Create a new scope to hold this declaration if necessary.
4279 Whether or not a new scope is necessary cannot be determined
4280 until after the type has been completed; if the type is a
4281 specialization of a class template it is not until after
4282 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4283 will be set correctly. */
4284 maybe_push_cleanup_level (type);
4287 /* Handle initialization of references. DECL, TYPE, and INIT have the
4288 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4289 but will be set to a new CLEANUP_STMT if a temporary is created
4290 that must be destroyed subsequently.
4292 Returns an initializer expression to use to initialize DECL, or
4293 NULL if the initialization can be performed statically.
4295 Quotes on semantics can be found in ARM 8.4.3. */
4298 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4302 if (init == NULL_TREE)
4304 if ((DECL_LANG_SPECIFIC (decl) == 0
4305 || DECL_IN_AGGR_P (decl) == 0)
4306 && ! DECL_THIS_EXTERN (decl))
4307 error ("%qD declared as reference but not initialized", decl);
4311 if (TREE_CODE (init) == CONSTRUCTOR)
4313 error ("ISO C++ forbids use of initializer list to "
4314 "initialize reference %qD", decl);
4318 if (TREE_CODE (init) == TREE_LIST)
4319 init = build_x_compound_expr_from_list (init, "initializer");
4321 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4322 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4323 /* Note: default conversion is only called in very special cases. */
4324 init = decay_conversion (init);
4326 /* Convert INIT to the reference type TYPE. This may involve the
4327 creation of a temporary, whose lifetime must be the same as that
4328 of the reference. If so, a DECL_EXPR for the temporary will be
4329 added just after the DECL_EXPR for DECL. That's why we don't set
4330 DECL_INITIAL for local references (instead assigning to them
4331 explicitly); we need to allow the temporary to be initialized
4333 tmp = initialize_reference (type, init, decl, cleanup);
4335 if (tmp == error_mark_node)
4337 else if (tmp == NULL_TREE)
4339 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4343 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4346 DECL_INITIAL (decl) = tmp;
4351 /* Subroutine of check_initializer. We're initializing a DECL of
4352 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4353 extend the lifetime of the underlying array to match that of the decl,
4354 just like for reference initialization. CLEANUP is as for
4355 grok_reference_init. */
4358 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4360 tree aggr_init, array, arrtype;
4361 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4362 aggr_init = TARGET_EXPR_INITIAL (init);
4363 init = build2 (INIT_EXPR, type, decl, init);
4365 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4366 arrtype = TREE_TYPE (array);
4368 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4369 array = TREE_OPERAND (array, 0);
4370 /* If the array is constant, finish_compound_literal already made it a
4371 static variable and we don't need to do anything here. */
4372 if (decl && TREE_CODE (array) == TARGET_EXPR)
4375 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4376 var = build_address (var);
4377 var = convert (arrtype, var);
4378 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4379 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4384 /* Designated initializers in arrays are not supported in GNU C++.
4385 The parser cannot detect this error since it does not know whether
4386 a given brace-enclosed initializer is for a class type or for an
4387 array. This function checks that CE does not use a designated
4388 initializer. If it does, an error is issued. Returns true if CE
4389 is valid, i.e., does not have a designated initializer. */
4392 check_array_designated_initializer (const constructor_elt *ce)
4394 /* Designated initializers for array elements are not supported. */
4397 /* The parser only allows identifiers as designated
4399 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4400 error ("name %qD used in a GNU-style designated "
4401 "initializer for an array", ce->index);
4408 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4409 array until we finish parsing the initializer. If that's the
4410 situation we're in, update DECL accordingly. */
4413 maybe_deduce_size_from_array_init (tree decl, tree init)
4415 tree type = TREE_TYPE (decl);
4417 if (TREE_CODE (type) == ARRAY_TYPE
4418 && TYPE_DOMAIN (type) == NULL_TREE
4419 && TREE_CODE (decl) != TYPE_DECL)
4421 /* do_default is really a C-ism to deal with tentative definitions.
4422 But let's leave it here to ease the eventual merge. */
4423 int do_default = !DECL_EXTERNAL (decl);
4424 tree initializer = init ? init : DECL_INITIAL (decl);
4427 /* Check that there are no designated initializers in INIT, as
4428 those are not supported in GNU C++, and as the middle-end
4429 will crash if presented with a non-numeric designated
4431 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4433 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4434 constructor_elt *ce;
4437 VEC_iterate (constructor_elt, v, i, ce);
4439 if (!check_array_designated_initializer (ce))
4445 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4449 error ("initializer fails to determine size of %qD", decl);
4450 TREE_TYPE (decl) = error_mark_node;
4452 else if (failure == 2)
4456 error ("array size missing in %qD", decl);
4457 TREE_TYPE (decl) = error_mark_node;
4459 /* If a `static' var's size isn't known, make it extern as
4460 well as static, so it does not get allocated. If it's not
4461 `static', then don't mark it extern; finish_incomplete_decl
4462 will give it a default size and it will get allocated. */
4463 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4464 DECL_EXTERNAL (decl) = 1;
4466 else if (failure == 3)
4468 error ("zero-size array %qD", decl);
4469 TREE_TYPE (decl) = error_mark_node;
4473 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4475 layout_decl (decl, 0);
4479 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4480 any appropriate error messages regarding the layout. */
4483 layout_var_decl (tree decl)
4487 type = TREE_TYPE (decl);
4488 if (type == error_mark_node)
4491 /* If we haven't already layed out this declaration, do so now.
4492 Note that we must not call complete type for an external object
4493 because it's type might involve templates that we are not
4494 supposed to instantiate yet. (And it's perfectly valid to say
4495 `extern X x' for some incomplete type `X'.) */
4496 if (!DECL_EXTERNAL (decl))
4497 complete_type (type);
4498 if (!DECL_SIZE (decl)
4499 && TREE_TYPE (decl) != error_mark_node
4500 && (COMPLETE_TYPE_P (type)
4501 || (TREE_CODE (type) == ARRAY_TYPE
4502 && !TYPE_DOMAIN (type)
4503 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4504 layout_decl (decl, 0);
4506 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4508 /* An automatic variable with an incomplete type: that is an error.
4509 Don't talk about array types here, since we took care of that
4510 message in grokdeclarator. */
4511 error ("storage size of %qD isn't known", decl);
4512 TREE_TYPE (decl) = error_mark_node;
4515 /* Keep this code around in case we later want to control debug info
4516 based on whether a type is "used". (jason 1999-11-11) */
4518 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4519 /* Let debugger know it should output info for this type. */
4520 note_debug_info_needed (ttype);
4522 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4523 note_debug_info_needed (DECL_CONTEXT (decl));
4526 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4527 && DECL_SIZE (decl) != NULL_TREE
4528 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4530 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4531 constant_expression_warning (DECL_SIZE (decl));
4534 error ("storage size of %qD isn't constant", decl);
4535 TREE_TYPE (decl) = error_mark_node;
4540 /* If a local static variable is declared in an inline function, or if
4541 we have a weak definition, we must endeavor to create only one
4542 instance of the variable at link-time. */
4545 maybe_commonize_var (tree decl)
4547 /* Static data in a function with comdat linkage also has comdat
4549 if (TREE_STATIC (decl)
4550 /* Don't mess with __FUNCTION__. */
4551 && ! DECL_ARTIFICIAL (decl)
4552 && DECL_FUNCTION_SCOPE_P (decl)
4553 /* Unfortunately, import_export_decl has not always been called
4554 before the function is processed, so we cannot simply check
4556 && (DECL_COMDAT (DECL_CONTEXT (decl))
4557 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4558 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4559 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4563 /* With weak symbols, we simply make the variable COMDAT;
4564 that will cause copies in multiple translations units to
4566 comdat_linkage (decl);
4570 if (DECL_INITIAL (decl) == NULL_TREE
4571 || DECL_INITIAL (decl) == error_mark_node)
4573 /* Without weak symbols, we can use COMMON to merge
4574 uninitialized variables. */
4575 TREE_PUBLIC (decl) = 1;
4576 DECL_COMMON (decl) = 1;
4580 /* While for initialized variables, we must use internal
4581 linkage -- which means that multiple copies will not
4583 TREE_PUBLIC (decl) = 0;
4584 DECL_COMMON (decl) = 0;
4585 warning (0, "sorry: semantics of inline function static "
4586 "data %q+#D are wrong (you'll wind up "
4587 "with multiple copies)", decl);
4588 warning (0, "%J you can work around this by removing "
4594 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4595 /* Set it up again; we might have set DECL_INITIAL since the last
4597 comdat_linkage (decl);
4600 /* Issue an error message if DECL is an uninitialized const variable. */
4603 check_for_uninitialized_const_var (tree decl)
4605 tree type = TREE_TYPE (decl);
4607 /* ``Unless explicitly declared extern, a const object does not have
4608 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4610 if (TREE_CODE (decl) == VAR_DECL
4611 && TREE_CODE (type) != REFERENCE_TYPE
4612 && CP_TYPE_CONST_P (type)
4613 && !TYPE_NEEDS_CONSTRUCTING (type)
4614 && !DECL_INITIAL (decl))
4615 error ("uninitialized const %qD", decl);
4619 /* Structure holding the current initializer being processed by reshape_init.
4620 CUR is a pointer to the current element being processed, END is a pointer
4621 after the last element present in the initializer. */
4622 typedef struct reshape_iterator_t
4624 constructor_elt *cur;
4625 constructor_elt *end;
4628 static tree reshape_init_r (tree, reshape_iter *, bool);
4630 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4631 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4632 initialized. If there are no more such fields, the return value
4636 next_initializable_field (tree field)
4639 && (TREE_CODE (field) != FIELD_DECL
4640 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4641 || DECL_ARTIFICIAL (field)))
4642 field = TREE_CHAIN (field);
4647 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4648 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4649 INTEGER_CST representing the size of the array minus one (the maximum index),
4650 or NULL_TREE if the array was declared without specifying the size. D is
4651 the iterator within the constructor. */
4654 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4657 bool sized_array_p = (max_index != NULL_TREE);
4658 unsigned HOST_WIDE_INT max_index_cst = 0;
4659 unsigned HOST_WIDE_INT index;
4661 /* The initializer for an array is always a CONSTRUCTOR. */
4662 new_init = build_constructor (init_list_type_node, NULL);
4666 /* Minus 1 is used for zero sized arrays. */
4667 if (integer_all_onesp (max_index))
4670 if (host_integerp (max_index, 1))
4671 max_index_cst = tree_low_cst (max_index, 1);
4672 /* sizetype is sign extended, not zero extended. */
4674 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4678 /* Loop until there are no more initializers. */
4680 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4685 check_array_designated_initializer (d->cur);
4686 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4687 if (elt_init == error_mark_node)
4688 return error_mark_node;
4689 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4695 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4696 Parameters are the same of reshape_init_r. */
4699 reshape_init_array (tree type, reshape_iter *d)
4701 tree max_index = NULL_TREE;
4703 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4705 if (TYPE_DOMAIN (type))
4706 max_index = array_type_nelts (type);
4708 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4711 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4712 Parameters are the same of reshape_init_r. */
4715 reshape_init_vector (tree type, reshape_iter *d)
4717 tree max_index = NULL_TREE;
4720 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4722 if (COMPOUND_LITERAL_P (d->cur->value))
4724 tree value = d->cur->value;
4725 if (!same_type_p (TREE_TYPE (value), type))
4727 error ("invalid type %qT as initializer for a vector of type %qT",
4728 TREE_TYPE (d->cur->value), type);
4729 value = error_mark_node;
4735 /* For a vector, the representation type is a struct
4736 containing a single member which is an array of the
4737 appropriate size. */
4738 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4739 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4740 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4742 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4745 /* Subroutine of reshape_init_r, processes the initializers for classes
4746 or union. Parameters are the same of reshape_init_r. */
4749 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4754 gcc_assert (CLASS_TYPE_P (type));
4756 /* The initializer for a class is always a CONSTRUCTOR. */
4757 new_init = build_constructor (init_list_type_node, NULL);
4758 field = next_initializable_field (TYPE_FIELDS (type));
4764 An initializer for an aggregate member that is an
4765 empty class shall have the form of an empty
4766 initializer-list {}. */
4767 if (!first_initializer_p)
4769 error ("initializer for %qT must be brace-enclosed", type);
4770 return error_mark_node;
4775 /* Loop through the initializable fields, gathering initializers. */
4776 while (d->cur != d->end)
4780 /* Handle designated initializers, as an extension. */
4783 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4785 if (!field || TREE_CODE (field) != FIELD_DECL)
4787 error ("%qT has no non-static data member named %qD", type,
4789 return error_mark_node;
4793 /* If we processed all the member of the class, we are done. */
4797 field_init = reshape_init_r (TREE_TYPE (field), d,
4798 /*first_initializer_p=*/false);
4799 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4803 When a union is initialized with a brace-enclosed
4804 initializer, the braces shall only contain an
4805 initializer for the first member of the union. */
4806 if (TREE_CODE (type) == UNION_TYPE)
4809 field = next_initializable_field (TREE_CHAIN (field));
4815 /* Subroutine of reshape_init, which processes a single initializer (part of
4816 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4817 iterator within the CONSTRUCTOR which points to the initializer to process.
4818 FIRST_INITIALIZER_P is true if this is the first initializer of the
4819 CONSTRUCTOR node. */
4822 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4824 tree init = d->cur->value;
4826 if (error_operand_p (init))
4827 return error_mark_node;
4829 /* A non-aggregate type is always initialized with a single
4831 if (!CP_AGGREGATE_TYPE_P (type))
4833 /* It is invalid to initialize a non-aggregate type with a
4834 brace-enclosed initializer before C++0x.
4835 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4836 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4837 a CONSTRUCTOR (with a record type). */
4838 if (TREE_CODE (init) == CONSTRUCTOR
4839 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4841 if (SCALAR_TYPE_P (type))
4843 error ("braces around scalar initializer for type %qT", type);
4844 init = error_mark_node;
4847 maybe_warn_cpp0x ("extended initializer lists");
4856 All implicit type conversions (clause _conv_) are considered when
4857 initializing the aggregate member with an initializer from an
4858 initializer-list. If the initializer can initialize a member,
4859 the member is initialized. Otherwise, if the member is itself a
4860 non-empty subaggregate, brace elision is assumed and the
4861 initializer is considered for the initialization of the first
4862 member of the subaggregate. */
4863 if (TREE_CODE (init) != CONSTRUCTOR
4864 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4870 /* [dcl.init.string]
4872 A char array (whether plain char, signed char, or unsigned char)
4873 can be initialized by a string-literal (optionally enclosed in
4874 braces); a wchar_t array can be initialized by a wide
4875 string-literal (optionally enclosed in braces). */
4876 if (TREE_CODE (type) == ARRAY_TYPE
4877 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4879 tree str_init = init;
4881 /* Strip one level of braces if and only if they enclose a single
4882 element (as allowed by [dcl.init.string]). */
4883 if (!first_initializer_p
4884 && TREE_CODE (str_init) == CONSTRUCTOR
4885 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4887 str_init = VEC_index (constructor_elt,
4888 CONSTRUCTOR_ELTS (str_init), 0)->value;
4891 /* If it's a string literal, then it's the initializer for the array
4892 as a whole. Otherwise, continue with normal initialization for
4893 array types (one value per array element). */
4894 if (TREE_CODE (str_init) == STRING_CST)
4901 /* The following cases are about aggregates. If we are not within a full
4902 initializer already, and there is not a CONSTRUCTOR, it means that there
4903 is a missing set of braces (that is, we are processing the case for
4904 which reshape_init exists). */
4905 if (!first_initializer_p)
4907 if (TREE_CODE (init) == CONSTRUCTOR)
4909 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4910 /* There is no need to reshape pointer-to-member function
4911 initializers, as they are always constructed correctly
4912 by the front end. */
4914 else if (COMPOUND_LITERAL_P (init))
4915 /* For a nested compound literal, there is no need to reshape since
4916 brace elision is not allowed. Even if we decided to allow it,
4917 we should add a call to reshape_init in finish_compound_literal,
4918 before calling digest_init, so changing this code would still
4919 not be necessary. */
4920 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4924 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4925 return reshape_init (type, init);
4929 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4933 /* Dispatch to specialized routines. */
4934 if (CLASS_TYPE_P (type))
4935 return reshape_init_class (type, d, first_initializer_p);
4936 else if (TREE_CODE (type) == ARRAY_TYPE)
4937 return reshape_init_array (type, d);
4938 else if (TREE_CODE (type) == VECTOR_TYPE)
4939 return reshape_init_vector (type, d);
4944 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4945 brace-enclosed aggregate initializer.
4947 INIT is the CONSTRUCTOR containing the list of initializers describing
4948 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4949 It may not presently match the shape of the TYPE; for example:
4951 struct S { int a; int b; };
4952 struct S a[] = { 1, 2, 3, 4 };
4954 Here INIT will hold a VEC of four elements, rather than a
4955 VEC of two elements, each itself a VEC of two elements. This
4956 routine transforms INIT from the former form into the latter. The
4957 revised CONSTRUCTOR node is returned. */
4960 reshape_init (tree type, tree init)
4962 VEC(constructor_elt, gc) *v;
4966 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4968 v = CONSTRUCTOR_ELTS (init);
4970 /* An empty constructor does not need reshaping, and it is always a valid
4972 if (VEC_empty (constructor_elt, v))
4975 /* Recurse on this CONSTRUCTOR. */
4976 d.cur = VEC_index (constructor_elt, v, 0);
4977 d.end = d.cur + VEC_length (constructor_elt, v);
4979 new_init = reshape_init_r (type, &d, true);
4980 if (new_init == error_mark_node)
4981 return error_mark_node;
4983 /* Make sure all the element of the constructor were used. Otherwise,
4984 issue an error about exceeding initializers. */
4986 error ("too many initializers for %qT", type);
4991 /* Verify array initializer. Returns true if errors have been reported. */
4994 check_array_initializer (tree decl, tree type, tree init)
4996 tree element_type = TREE_TYPE (type);
4998 /* The array type itself need not be complete, because the
4999 initializer may tell us how many elements are in the array.
5000 But, the elements of the array must be complete. */
5001 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5004 error ("elements of array %q#D have incomplete type", decl);
5006 error ("elements of array %q#T have incomplete type", type);
5009 /* It is not valid to initialize a VLA. */
5011 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5012 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5015 error ("variable-sized object %qD may not be initialized", decl);
5017 error ("variable-sized compound literal");
5023 /* Subroutine of check_initializer; args are passed down from that function.
5024 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5027 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5030 int saved_stmts_are_full_exprs_p = 0;
5031 if (building_stmt_tree ())
5033 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5034 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5036 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5037 if (building_stmt_tree ())
5038 current_stmt_tree ()->stmts_are_full_exprs_p =
5039 saved_stmts_are_full_exprs_p;
5043 /* Verify INIT (the initializer for DECL), and record the
5044 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5045 grok_reference_init.
5047 If the return value is non-NULL, it is an expression that must be
5048 evaluated dynamically to initialize DECL. */
5051 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5053 tree type = TREE_TYPE (decl);
5054 tree init_code = NULL;
5056 /* Things that are going to be initialized need to have complete
5058 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5060 if (type == error_mark_node)
5061 /* We will have already complained. */
5064 if (TREE_CODE (type) == ARRAY_TYPE)
5066 if (check_array_initializer (decl, type, init))
5069 else if (!COMPLETE_TYPE_P (type))
5071 error ("%qD has incomplete type", decl);
5072 TREE_TYPE (decl) = error_mark_node;
5076 /* There is no way to make a variable-sized class type in GNU C++. */
5077 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5079 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5081 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5082 if (SCALAR_TYPE_P (type))
5086 maybe_warn_cpp0x ("extended initializer lists");
5087 init = build_zero_init (type, NULL_TREE, false);
5089 else if (init_len != 1)
5091 error ("scalar object %qD requires one element in initializer",
5093 TREE_TYPE (decl) = error_mark_node;
5099 if (TREE_CODE (decl) == CONST_DECL)
5101 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5103 DECL_INITIAL (decl) = init;
5105 gcc_assert (init != NULL_TREE);
5108 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5109 init = grok_reference_init (decl, type, init, cleanup);
5112 /* Do not reshape constructors of vectors (they don't need to be
5114 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5116 if (is_std_init_list (type))
5117 return build_init_list_var_init (decl, type, init, cleanup);
5118 else if (TYPE_NON_AGGREGATE_CLASS (type))
5120 /* Don't reshape if the class has constructors. */
5121 if (cxx_dialect == cxx98)
5122 error ("in C++98 %qD must be initialized by constructor, "
5125 init = build_tree_list (NULL_TREE, init);
5127 else if ((*targetm.vector_opaque_p) (type))
5129 error ("opaque vector types cannot be initialized");
5130 init = error_mark_node;
5133 init = reshape_init (type, init);
5136 /* If DECL has an array type without a specific bound, deduce the
5137 array size from the initializer. */
5138 maybe_deduce_size_from_array_init (decl, init);
5139 type = TREE_TYPE (decl);
5140 if (type == error_mark_node)
5143 if (TYPE_NEEDS_CONSTRUCTING (type)
5144 || (CLASS_TYPE_P (type)
5145 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5146 return build_aggr_init_full_exprs (decl, init, flags);
5147 else if (TREE_CODE (init) != TREE_VEC)
5149 init_code = store_init_value (decl, init);
5150 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5151 && DECL_INITIAL (decl)
5152 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5153 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5154 warning (0, "array %qD initialized by parenthesized string literal %qE",
5155 decl, DECL_INITIAL (decl));
5159 else if (DECL_EXTERNAL (decl))
5161 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5162 return build_aggr_init_full_exprs (decl, init, flags);
5163 else if (MAYBE_CLASS_TYPE_P (type))
5165 tree core_type = strip_array_types (type);
5167 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5168 error ("structure %qD with uninitialized const members", decl);
5169 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5170 error ("structure %qD with uninitialized reference members", decl);
5172 check_for_uninitialized_const_var (decl);
5175 check_for_uninitialized_const_var (decl);
5177 if (init && init != error_mark_node)
5178 init_code = build2 (INIT_EXPR, type, decl, init);
5183 /* If DECL is not a local variable, give it RTL. */
5186 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5188 int toplev = toplevel_bindings_p ();
5190 const char *filename;
5192 /* Set the DECL_ASSEMBLER_NAME for the object. */
5195 /* The `register' keyword, when used together with an
5196 asm-specification, indicates that the variable should be
5197 placed in a particular register. */
5198 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5200 set_user_assembler_name (decl, asmspec);
5201 DECL_HARD_REGISTER (decl) = 1;
5205 if (TREE_CODE (decl) == FUNCTION_DECL
5206 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5207 set_builtin_user_assembler_name (decl, asmspec);
5208 set_user_assembler_name (decl, asmspec);
5212 /* Handle non-variables up front. */
5213 if (TREE_CODE (decl) != VAR_DECL)
5215 rest_of_decl_compilation (decl, toplev, at_eof);
5219 /* If we see a class member here, it should be a static data
5221 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5223 gcc_assert (TREE_STATIC (decl));
5224 /* An in-class declaration of a static data member should be
5225 external; it is only a declaration, and not a definition. */
5226 if (init == NULL_TREE)
5227 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5230 /* We don't create any RTL for local variables. */
5231 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5234 /* We defer emission of local statics until the corresponding
5235 DECL_EXPR is expanded. */
5236 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5238 /* We try to defer namespace-scope static constants so that they are
5239 not emitted into the object file unnecessarily. */
5240 filename = input_filename;
5241 if (!DECL_VIRTUAL_P (decl)
5242 && TREE_READONLY (decl)
5243 && DECL_INITIAL (decl) != NULL_TREE
5244 && DECL_INITIAL (decl) != error_mark_node
5246 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5248 && !TREE_PUBLIC (decl))
5250 /* Fool with the linkage of static consts according to #pragma
5252 struct c_fileinfo *finfo = get_fileinfo (filename);
5253 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5255 TREE_PUBLIC (decl) = 1;
5256 DECL_EXTERNAL (decl) = finfo->interface_only;
5261 /* Likewise for template instantiations. */
5262 else if (DECL_LANG_SPECIFIC (decl)
5263 && DECL_IMPLICIT_INSTANTIATION (decl))
5266 /* If we're not deferring, go ahead and assemble the variable. */
5268 rest_of_decl_compilation (decl, toplev, at_eof);
5271 /* walk_tree helper for wrap_temporary_cleanups, below. */
5274 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5276 if (TYPE_P (*stmt_p))
5282 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5284 tree guard = (tree)data;
5285 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5287 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5288 /* Tell honor_protect_cleanup_actions to handle this as a separate
5290 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5292 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5298 /* We're initializing a local variable which has a cleanup GUARD. If there
5299 are any temporaries used in the initializer INIT of this variable, we
5300 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5301 variable will be cleaned up properly if one of them throws.
5303 Unfortunately, there's no way to express this properly in terms of
5304 nesting, as the regions for the temporaries overlap the region for the
5305 variable itself; if there are two temporaries, the variable needs to be
5306 the first thing destroyed if either of them throws. However, we only
5307 want to run the variable's cleanup if it actually got constructed. So
5308 we need to guard the temporary cleanups with the variable's cleanup if
5309 they are run on the normal path, but not if they are run on the
5310 exceptional path. We implement this by telling
5311 honor_protect_cleanup_actions to strip the variable cleanup from the
5312 exceptional path. */
5315 wrap_temporary_cleanups (tree init, tree guard)
5317 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5320 /* Generate code to initialize DECL (a local variable). */
5323 initialize_local_var (tree decl, tree init)
5325 tree type = TREE_TYPE (decl);
5329 gcc_assert (TREE_CODE (decl) == VAR_DECL
5330 || TREE_CODE (decl) == RESULT_DECL);
5331 gcc_assert (!TREE_STATIC (decl));
5333 if (DECL_SIZE (decl) == NULL_TREE)
5335 /* If we used it already as memory, it must stay in memory. */
5336 DECL_INITIAL (decl) = NULL_TREE;
5337 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5341 if (type == error_mark_node)
5344 /* Compute and store the initial value. */
5345 already_used = TREE_USED (decl) || TREE_USED (type);
5347 /* Generate a cleanup, if necessary. */
5348 cleanup = cxx_maybe_build_cleanup (decl);
5350 /* Perform the initialization. */
5353 int saved_stmts_are_full_exprs_p;
5355 /* If we're only initializing a single object, guard the destructors
5356 of any temporaries used in its initializer with its destructor.
5357 This isn't right for arrays because each element initialization is
5358 a full-expression. */
5359 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5360 wrap_temporary_cleanups (init, cleanup);
5362 gcc_assert (building_stmt_tree ());
5363 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5364 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5365 finish_expr_stmt (init);
5366 current_stmt_tree ()->stmts_are_full_exprs_p =
5367 saved_stmts_are_full_exprs_p;
5370 /* Set this to 0 so we can tell whether an aggregate which was
5371 initialized was ever used. Don't do this if it has a
5372 destructor, so we don't complain about the 'resource
5373 allocation is initialization' idiom. Now set
5374 attribute((unused)) on types so decls of that type will be
5375 marked used. (see TREE_USED, above.) */
5376 if (TYPE_NEEDS_CONSTRUCTING (type)
5378 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5379 && DECL_NAME (decl))
5380 TREE_USED (decl) = 0;
5381 else if (already_used)
5382 TREE_USED (decl) = 1;
5385 finish_decl_cleanup (decl, cleanup);
5388 /* DECL is a VAR_DECL for a compiler-generated variable with static
5389 storage duration (like a virtual table) whose initializer is a
5390 compile-time constant. INIT must be either a TREE_LIST of values,
5391 or a CONSTRUCTOR. Initialize the variable and provide it to the
5395 initialize_artificial_var (tree decl, tree init)
5397 gcc_assert (DECL_ARTIFICIAL (decl));
5398 if (TREE_CODE (init) == TREE_LIST)
5399 init = build_constructor_from_list (TREE_TYPE (decl), init);
5400 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5401 DECL_INITIAL (decl) = init;
5402 DECL_INITIALIZED_P (decl) = 1;
5403 determine_visibility (decl);
5404 layout_var_decl (decl);
5405 maybe_commonize_var (decl);
5406 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5409 /* INIT is the initializer for a variable, as represented by the
5410 parser. Returns true iff INIT is value-dependent. */
5413 value_dependent_init_p (tree init)
5415 if (TREE_CODE (init) == TREE_LIST)
5416 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5417 return any_value_dependent_elements_p (init);
5418 else if (TREE_CODE (init) == CONSTRUCTOR)
5419 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5421 VEC(constructor_elt, gc) *elts;
5425 elts = CONSTRUCTOR_ELTS (init);
5426 nelts = VEC_length (constructor_elt, elts);
5427 for (i = 0; i < nelts; ++i)
5428 if (value_dependent_init_p (VEC_index (constructor_elt,
5433 /* It must be a simple expression, e.g., int i = 3; */
5434 return value_dependent_expression_p (init);
5439 /* Finish processing of a declaration;
5440 install its line number and initial value.
5441 If the length of an array type is not known before,
5442 it must be determined now, from the initial value, or it is an error.
5444 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5445 true, then INIT is an integral constant expression.
5447 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5448 if the (init) syntax was used. */
5451 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5452 tree asmspec_tree, int flags)
5456 const char *asmspec = NULL;
5457 int was_readonly = 0;
5458 bool var_definition_p = false;
5459 int saved_processing_template_decl;
5462 if (decl == error_mark_node)
5467 error ("assignment (not initialization) in declaration");
5471 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5472 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5473 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5475 type = TREE_TYPE (decl);
5476 if (type == error_mark_node)
5479 /* Assume no cleanup is required. */
5480 cleanup = NULL_TREE;
5481 saved_processing_template_decl = processing_template_decl;
5483 /* If a name was specified, get the string. */
5484 if (global_scope_p (current_binding_level))
5485 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5486 if (asmspec_tree && asmspec_tree != error_mark_node)
5487 asmspec = TREE_STRING_POINTER (asmspec_tree);
5489 if (current_class_type
5490 && CP_DECL_CONTEXT (decl) == current_class_type
5491 && TYPE_BEING_DEFINED (current_class_type)
5492 && (DECL_INITIAL (decl) || init))
5493 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5495 auto_node = type_uses_auto (type);
5498 if (init == NULL_TREE)
5500 error ("declaration of %q#D has no initializer", decl);
5501 TREE_TYPE (decl) = error_mark_node;
5504 else if (describable_type (init))
5506 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5507 if (type == error_mark_node)
5512 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5514 if (init == ridpointers[(int)RID_DELETE])
5516 /* FIXME check this is 1st decl. */
5517 DECL_DELETED_FN (decl) = 1;
5518 DECL_DECLARED_INLINE_P (decl) = 1;
5519 DECL_INITIAL (decl) = error_mark_node;
5522 else if (init == ridpointers[(int)RID_DEFAULT])
5524 if (!defaultable_fn_p (decl))
5526 error ("%qD cannot be defaulted", decl);
5527 DECL_INITIAL (decl) = NULL_TREE;
5530 DECL_DEFAULTED_FN (decl) = 1;
5534 if (processing_template_decl)
5536 bool type_dependent_p;
5538 /* Add this declaration to the statement-tree. */
5539 if (at_function_scope_p ())
5540 add_decl_expr (decl);
5542 type_dependent_p = dependent_type_p (type);
5544 if (check_for_bare_parameter_packs (init))
5547 DECL_INITIAL (decl) = NULL_TREE;
5550 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5552 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5553 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5554 TREE_CONSTANT (decl) = 1;
5557 /* Generally, initializers in templates are expanded when the
5558 template is instantiated. But, if DECL is an integral
5559 constant static data member, then it can be used in future
5560 integral constant expressions, and its value must be
5563 && DECL_CLASS_SCOPE_P (decl)
5564 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5565 && !type_dependent_p
5566 && !value_dependent_init_p (init)))
5569 DECL_INITIAL (decl) = init;
5570 if (TREE_CODE (decl) == VAR_DECL
5571 && !DECL_PRETTY_FUNCTION_P (decl)
5572 && !type_dependent_p)
5573 maybe_deduce_size_from_array_init (decl, init);
5577 if (TREE_CODE (init) == TREE_LIST)
5579 /* If the parenthesized-initializer form was used (e.g.,
5580 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5581 arguments. (There is generally only one.) We convert them
5584 for (; list; list = TREE_CHAIN (list))
5586 tree elt = TREE_VALUE (list);
5587 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5591 init = fold_non_dependent_expr (init);
5592 processing_template_decl = 0;
5595 /* Take care of TYPE_DECLs up front. */
5596 if (TREE_CODE (decl) == TYPE_DECL)
5598 if (type != error_mark_node
5599 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5601 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5602 warning (0, "shadowing previous type declaration of %q#D", decl);
5603 set_identifier_type_value (DECL_NAME (decl), decl);
5606 /* If we have installed this as the canonical typedef for this
5607 type, and that type has not been defined yet, delay emitting
5608 the debug information for it, as we will emit it later. */
5609 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5610 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5611 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5613 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5618 /* A reference will be modified here, as it is initialized. */
5619 if (! DECL_EXTERNAL (decl)
5620 && TREE_READONLY (decl)
5621 && TREE_CODE (type) == REFERENCE_TYPE)
5624 TREE_READONLY (decl) = 0;
5627 if (TREE_CODE (decl) == VAR_DECL)
5629 /* Only PODs can have thread-local storage. Other types may require
5630 various kinds of non-trivial initialization. */
5631 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5632 error ("%qD cannot be thread-local because it has non-POD type %qT",
5633 decl, TREE_TYPE (decl));
5634 /* If this is a local variable that will need a mangled name,
5635 register it now. We must do this before processing the
5636 initializer for the variable, since the initialization might
5637 require a guard variable, and since the mangled name of the
5638 guard variable will depend on the mangled name of this
5640 if (DECL_FUNCTION_SCOPE_P (decl)
5641 && TREE_STATIC (decl)
5642 && !DECL_ARTIFICIAL (decl))
5643 push_local_name (decl);
5644 /* Convert the initializer to the type of DECL, if we have not
5645 already initialized DECL. */
5646 if (!DECL_INITIALIZED_P (decl)
5647 /* If !DECL_EXTERNAL then DECL is being defined. In the
5648 case of a static data member initialized inside the
5649 class-specifier, there can be an initializer even if DECL
5650 is *not* defined. */
5651 && (!DECL_EXTERNAL (decl) || init))
5653 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5656 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5657 /* Allow libjava/prims.cc define primitive classes. */
5658 if (init != NULL_TREE
5659 || jclass == NULL_TREE
5660 || TREE_CODE (jclass) != TYPE_DECL
5661 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5662 || !same_type_ignoring_top_level_qualifiers_p
5663 (type, TREE_TYPE (TREE_TYPE (jclass))))
5664 error ("Java object %qD not allocated with %<new%>", decl);
5669 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5670 if (init_const_expr_p)
5672 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5673 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5674 TREE_CONSTANT (decl) = 1;
5677 init = check_initializer (decl, init, flags, &cleanup);
5678 /* Thread-local storage cannot be dynamically initialized. */
5679 if (DECL_THREAD_LOCAL_P (decl) && init)
5681 error ("%qD is thread-local and so cannot be dynamically "
5682 "initialized", decl);
5686 /* Check that the initializer for a static data member was a
5687 constant. Although we check in the parser that the
5688 initializer is an integral constant expression, we do not
5689 simplify division-by-zero at the point at which it
5690 occurs. Therefore, in:
5692 struct S { static const int i = 7 / 0; };
5694 we issue an error at this point. It would
5695 probably be better to forbid division by zero in
5696 integral constant expressions. */
5697 if (DECL_EXTERNAL (decl) && init)
5699 error ("%qD cannot be initialized by a non-constant expression"
5700 " when being declared", decl);
5701 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5709 The memory occupied by any object of static storage
5710 duration is zero-initialized at program startup before
5711 any other initialization takes place.
5713 We cannot create an appropriate initializer until after
5714 the type of DECL is finalized. If DECL_INITIAL is set,
5715 then the DECL is statically initialized, and any
5716 necessary zero-initialization has already been performed. */
5717 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5718 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5719 /*nelts=*/NULL_TREE,
5720 /*static_storage_p=*/true);
5721 /* Remember that the initialization for this variable has
5723 DECL_INITIALIZED_P (decl) = 1;
5724 /* This declaration is the definition of this variable,
5725 unless we are initializing a static data member within
5726 the class specifier. */
5727 if (!DECL_EXTERNAL (decl))
5728 var_definition_p = true;
5730 /* If the variable has an array type, lay out the type, even if
5731 there is no initializer. It is valid to index through the
5732 array, and we must get TYPE_ALIGN set correctly on the array
5734 else if (TREE_CODE (type) == ARRAY_TYPE)
5737 else if (TREE_CODE (decl) == FIELD_DECL
5738 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5739 error ("non-static data member %qD has Java class type", decl);
5741 /* Add this declaration to the statement-tree. This needs to happen
5742 after the call to check_initializer so that the DECL_EXPR for a
5743 reference temp is added before the DECL_EXPR for the reference itself. */
5744 if (at_function_scope_p ())
5745 add_decl_expr (decl);
5747 /* Let the middle end know about variables and functions -- but not
5748 static data members in uninstantiated class templates. */
5749 if (!saved_processing_template_decl
5750 && (TREE_CODE (decl) == VAR_DECL
5751 || TREE_CODE (decl) == FUNCTION_DECL))
5753 if (TREE_CODE (decl) == VAR_DECL)
5755 layout_var_decl (decl);
5756 maybe_commonize_var (decl);
5759 /* This needs to happen after the linkage is set. */
5760 determine_visibility (decl);
5762 if (var_definition_p && TREE_STATIC (decl))
5764 /* If a TREE_READONLY variable needs initialization
5765 at runtime, it is no longer readonly and we need to
5766 avoid MEM_READONLY_P being set on RTL created for it. */
5769 if (TREE_READONLY (decl))
5770 TREE_READONLY (decl) = 0;
5773 else if (was_readonly)
5774 TREE_READONLY (decl) = 1;
5777 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5779 /* Check for abstractness of the type. Notice that there is no
5780 need to strip array types here since the check for those types
5781 is already done within create_array_type_for_decl. */
5782 if (TREE_CODE (type) == FUNCTION_TYPE
5783 || TREE_CODE (type) == METHOD_TYPE)
5784 abstract_virtuals_error (decl, TREE_TYPE (type));
5786 abstract_virtuals_error (decl, type);
5788 if (TREE_TYPE (decl) == error_mark_node)
5789 /* No initialization required. */
5791 else if (TREE_CODE (decl) == FUNCTION_DECL)
5795 if (init == ridpointers[(int)RID_DEFAULT])
5797 /* An out-of-class default definition is defined at
5798 the point where it is explicitly defaulted. */
5799 if (DECL_INITIAL (decl) == error_mark_node)
5800 synthesize_method (decl);
5803 error ("function %q#D is initialized like a variable", decl);
5805 /* else no initialization required. */
5807 else if (DECL_EXTERNAL (decl)
5808 && ! (DECL_LANG_SPECIFIC (decl)
5809 && DECL_NOT_REALLY_EXTERN (decl)))
5812 DECL_INITIAL (decl) = init;
5814 /* A variable definition. */
5815 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5816 /* Initialize the local variable. */
5817 initialize_local_var (decl, init);
5819 /* If a variable is defined, and then a subsequent
5820 definition with external linkage is encountered, we will
5821 get here twice for the same variable. We want to avoid
5822 calling expand_static_init more than once. For variables
5823 that are not static data members, we can call
5824 expand_static_init only when we actually process the
5825 initializer. It is not legal to redeclare a static data
5826 member, so this issue does not arise in that case. */
5827 else if (var_definition_p && TREE_STATIC (decl))
5828 expand_static_init (decl, init);
5831 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5832 reference, insert it in the statement-tree now. */
5834 push_cleanup (decl, cleanup, false);
5837 processing_template_decl = saved_processing_template_decl;
5840 TREE_READONLY (decl) = 1;
5842 /* If this was marked 'used', be sure it will be output. */
5843 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5844 mark_decl_referenced (decl);
5847 /* This is here for a midend callback from c-common.c. */
5850 finish_decl (tree decl, tree init, tree asmspec_tree)
5852 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5855 /* Returns a declaration for a VAR_DECL as if:
5857 extern "C" TYPE NAME;
5859 had been seen. Used to create compiler-generated global
5863 declare_global_var (tree name, tree type)
5867 push_to_top_level ();
5868 decl = build_decl (VAR_DECL, name, type);
5869 TREE_PUBLIC (decl) = 1;
5870 DECL_EXTERNAL (decl) = 1;
5871 DECL_ARTIFICIAL (decl) = 1;
5872 /* If the user has explicitly declared this variable (perhaps
5873 because the code we are compiling is part of a low-level runtime
5874 library), then it is possible that our declaration will be merged
5875 with theirs by pushdecl. */
5876 decl = pushdecl (decl);
5877 finish_decl (decl, NULL_TREE, NULL_TREE);
5878 pop_from_top_level ();
5883 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5884 if "__cxa_atexit" is not being used) corresponding to the function
5885 to be called when the program exits. */
5888 get_atexit_fn_ptr_type (void)
5893 if (!atexit_fn_ptr_type_node)
5895 if (flag_use_cxa_atexit
5896 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5897 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5898 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5900 /* The parameter to "atexit" is "void (*)(void)". */
5901 arg_types = void_list_node;
5903 fn_type = build_function_type (void_type_node, arg_types);
5904 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5907 return atexit_fn_ptr_type_node;
5910 /* Returns a pointer to the `atexit' function. Note that if
5911 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5912 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5915 get_atexit_node (void)
5922 bool use_aeabi_atexit;
5927 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5929 /* The declaration for `__cxa_atexit' is:
5931 int __cxa_atexit (void (*)(void *), void *, void *)
5933 We build up the argument types and then then function type
5936 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5937 /* First, build the pointer-to-function type for the first
5939 fn_ptr_type = get_atexit_fn_ptr_type ();
5940 /* Then, build the rest of the argument types. */
5941 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5942 if (use_aeabi_atexit)
5944 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5945 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5949 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5950 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5952 /* And the final __cxa_atexit type. */
5953 fn_type = build_function_type (integer_type_node, arg_types);
5954 fn_ptr_type = build_pointer_type (fn_type);
5955 if (use_aeabi_atexit)
5956 name = "__aeabi_atexit";
5958 name = "__cxa_atexit";
5962 /* The declaration for `atexit' is:
5964 int atexit (void (*)());
5966 We build up the argument types and then then function type
5968 fn_ptr_type = get_atexit_fn_ptr_type ();
5969 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5970 /* Build the final atexit type. */
5971 fn_type = build_function_type (integer_type_node, arg_types);
5975 /* Now, build the function declaration. */
5976 push_lang_context (lang_name_c);
5977 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5978 mark_used (atexit_fndecl);
5979 pop_lang_context ();
5980 atexit_node = decay_conversion (atexit_fndecl);
5985 /* Returns the __dso_handle VAR_DECL. */
5988 get_dso_handle_node (void)
5990 if (dso_handle_node)
5991 return dso_handle_node;
5993 /* Declare the variable. */
5994 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5997 return dso_handle_node;
6000 /* Begin a new function with internal linkage whose job will be simply
6001 to destroy some particular variable. */
6003 static GTY(()) int start_cleanup_cnt;
6006 start_cleanup_fn (void)
6011 bool use_cxa_atexit = flag_use_cxa_atexit
6012 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6014 push_to_top_level ();
6016 /* No need to mangle this. */
6017 push_lang_context (lang_name_c);
6019 /* Build the name of the function. */
6020 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6021 /* Build the function declaration. */
6022 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6023 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6024 /* It's a function with internal linkage, generated by the
6026 TREE_PUBLIC (fndecl) = 0;
6027 DECL_ARTIFICIAL (fndecl) = 1;
6028 /* Make the function `inline' so that it is only emitted if it is
6029 actually needed. It is unlikely that it will be inlined, since
6030 it is only called via a function pointer, but we avoid unnecessary
6031 emissions this way. */
6032 DECL_DECLARED_INLINE_P (fndecl) = 1;
6033 DECL_INTERFACE_KNOWN (fndecl) = 1;
6034 /* Build the parameter. */
6039 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6040 DECL_CONTEXT (parmdecl) = fndecl;
6041 TREE_USED (parmdecl) = 1;
6042 DECL_ARGUMENTS (fndecl) = parmdecl;
6046 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6048 pop_lang_context ();
6050 return current_function_decl;
6053 /* Finish the cleanup function begun by start_cleanup_fn. */
6056 end_cleanup_fn (void)
6058 expand_or_defer_fn (finish_function (0));
6060 pop_from_top_level ();
6063 /* Generate code to handle the destruction of DECL, an object with
6064 static storage duration. */
6067 register_dtor_fn (tree decl)
6076 type = TREE_TYPE (decl);
6077 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6078 return void_zero_node;
6080 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6081 a class object, we can just pass the destructor to
6082 "__cxa_atexit"; we don't have to build a temporary function to do
6084 use_dtor = (flag_use_cxa_atexit
6085 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6086 && CLASS_TYPE_P (type));
6091 /* Find the destructor. */
6092 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6093 gcc_assert (idx >= 0);
6094 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6095 /* Make sure it is accessible. */
6096 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6100 /* Call build_cleanup before we enter the anonymous function so
6101 that any access checks will be done relative to the current
6102 scope, rather than the scope of the anonymous function. */
6103 build_cleanup (decl);
6105 /* Now start the function. */
6106 cleanup = start_cleanup_fn ();
6108 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6109 to the original function, rather than the anonymous one. That
6110 will make the back end think that nested functions are in use,
6111 which causes confusion. */
6112 push_deferring_access_checks (dk_no_check);
6113 fcall = build_cleanup (decl);
6114 pop_deferring_access_checks ();
6116 /* Create the body of the anonymous function. */
6117 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6118 finish_expr_stmt (fcall);
6119 finish_compound_stmt (compound_stmt);
6123 /* Call atexit with the cleanup function. */
6124 mark_used (cleanup);
6125 cleanup = build_address (cleanup);
6126 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6132 /* We must convert CLEANUP to the type that "__cxa_atexit"
6134 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6135 /* "__cxa_atexit" will pass the address of DECL to the
6136 cleanup function. */
6138 addr = build_address (decl);
6139 /* The declared type of the parameter to "__cxa_atexit" is
6140 "void *". For plain "T*", we could just let the
6141 machinery in cp_build_function_call convert it -- but if the
6142 type is "cv-qualified T *", then we need to convert it
6143 before passing it in, to avoid spurious errors. */
6144 addr = build_nop (ptr_type_node, addr);
6147 /* Since the cleanup functions we build ignore the address
6148 they're given, there's no reason to pass the actual address
6149 in, and, in general, it's cheaper to pass NULL than any
6151 addr = null_pointer_node;
6152 args = tree_cons (NULL_TREE,
6153 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6154 tf_warning_or_error),
6156 if (targetm.cxx.use_aeabi_atexit ())
6158 args = tree_cons (NULL_TREE, cleanup, args);
6159 args = tree_cons (NULL_TREE, addr, args);
6163 args = tree_cons (NULL_TREE, addr, args);
6164 args = tree_cons (NULL_TREE, cleanup, args);
6168 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6169 return cp_build_function_call (get_atexit_node (), args,
6170 tf_warning_or_error);
6173 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6174 is its initializer. Generate code to handle the construction
6175 and destruction of DECL. */
6178 expand_static_init (tree decl, tree init)
6180 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6181 gcc_assert (TREE_STATIC (decl));
6183 /* Some variables require no initialization. */
6185 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6186 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6189 if (DECL_FUNCTION_SCOPE_P (decl))
6191 /* Emit code to perform this initialization but once. */
6192 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6193 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6194 tree guard, guard_addr;
6195 tree acquire_fn, release_fn, abort_fn;
6198 /* Emit code to perform this initialization but once. This code
6201 static <type> guard;
6202 if (!guard.first_byte) {
6203 if (__cxa_guard_acquire (&guard)) {
6206 // Do initialization.
6207 flag = true; __cxa_guard_release (&guard);
6208 // Register variable for destruction at end of program.
6210 if (!flag) __cxa_guard_abort (&guard);
6214 Note that the `flag' variable is only set to 1 *after* the
6215 initialization is complete. This ensures that an exception,
6216 thrown during the construction, will cause the variable to
6217 reinitialized when we pass through this code again, as per:
6221 If the initialization exits by throwing an exception, the
6222 initialization is not complete, so it will be tried again
6223 the next time control enters the declaration.
6225 This process should be thread-safe, too; multiple threads
6226 should not be able to initialize the variable more than
6229 /* Create the guard variable. */
6230 guard = get_guard (decl);
6232 /* This optimization isn't safe on targets with relaxed memory
6233 consistency. On such targets we force synchronization in
6234 __cxa_guard_acquire. */
6235 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6237 /* Begin the conditional initialization. */
6238 if_stmt = begin_if_stmt ();
6239 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6240 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6243 if (flag_threadsafe_statics)
6245 guard_addr = build_address (guard);
6247 acquire_fn = get_identifier ("__cxa_guard_acquire");
6248 release_fn = get_identifier ("__cxa_guard_release");
6249 abort_fn = get_identifier ("__cxa_guard_abort");
6250 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6252 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6254 tree vfntype = build_function_type (void_type_node, argtypes);
6255 acquire_fn = push_library_fn
6256 (acquire_fn, build_function_type (integer_type_node, argtypes),
6258 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6259 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6263 release_fn = identifier_global_value (release_fn);
6264 abort_fn = identifier_global_value (abort_fn);
6267 inner_if_stmt = begin_if_stmt ();
6268 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6271 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6272 begin = get_target_expr (boolean_false_node);
6273 flag = TARGET_EXPR_SLOT (begin);
6275 TARGET_EXPR_CLEANUP (begin)
6276 = build3 (COND_EXPR, void_type_node, flag,
6278 build_call_n (abort_fn, 1, guard_addr));
6279 CLEANUP_EH_ONLY (begin) = 1;
6281 /* Do the initialization itself. */
6282 init = add_stmt_to_compound (begin, init);
6283 init = add_stmt_to_compound
6284 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6285 init = add_stmt_to_compound
6286 (init, build_call_n (release_fn, 1, guard_addr));
6289 init = add_stmt_to_compound (init, set_guard (guard));
6291 /* Use atexit to register a function for destroying this static
6293 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6295 finish_expr_stmt (init);
6297 if (flag_threadsafe_statics)
6299 finish_compound_stmt (inner_then_clause);
6300 finish_then_clause (inner_if_stmt);
6301 finish_if_stmt (inner_if_stmt);
6304 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6306 finish_compound_stmt (then_clause);
6307 finish_then_clause (if_stmt);
6308 finish_if_stmt (if_stmt);
6312 static_aggregates = tree_cons (init, decl, static_aggregates);
6316 /* Make TYPE a complete type based on INITIAL_VALUE.
6317 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6318 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6319 3 if the initializer list is empty (in pedantic mode). */
6322 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6325 tree type, elt_type;
6329 unsigned HOST_WIDE_INT i;
6332 /* An array of character type can be initialized from a
6333 brace-enclosed string constant.
6335 FIXME: this code is duplicated from reshape_init. Probably
6336 we should just call reshape_init here? */
6337 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6338 && TREE_CODE (initial_value) == CONSTRUCTOR
6339 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6341 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6342 tree value = VEC_index (constructor_elt, v, 0)->value;
6344 if (TREE_CODE (value) == STRING_CST
6345 && VEC_length (constructor_elt, v) == 1)
6346 initial_value = value;
6349 /* If any of the elements are parameter packs, we can't actually
6350 complete this type now because the array size is dependent. */
6351 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6353 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6356 if (PACK_EXPANSION_P (value))
6362 failure = complete_array_type (ptype, initial_value, do_default);
6364 /* We can create the array before the element type is complete, which
6365 means that we didn't have these two bits set in the original type
6366 either. In completing the type, we are expected to propagate these
6367 bits. See also complete_type which does the same thing for arrays
6370 if (TYPE_DOMAIN (type))
6372 elt_type = TREE_TYPE (type);
6373 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6374 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6375 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6381 /* Return zero if something is declared to be a member of type
6382 CTYPE when in the context of CUR_TYPE. STRING is the error
6383 message to print in that case. Otherwise, quietly return 1. */
6386 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6388 if (ctype && ctype != cur_type)
6390 if (flags == DTOR_FLAG)
6391 error ("destructor for alien class %qT cannot be a member", ctype);
6393 error ("constructor for alien class %qT cannot be a member", ctype);
6399 /* Subroutine of `grokdeclarator'. */
6401 /* Generate errors possibly applicable for a given set of specifiers.
6402 This is for ARM $7.1.2. */
6405 bad_specifiers (tree object,
6414 error ("%qD declared as a %<virtual%> %s", object, type);
6416 error ("%qD declared as an %<inline%> %s", object, type);
6418 error ("%<const%> and %<volatile%> function specifiers on "
6419 "%qD invalid in %s declaration",
6422 error ("%q+D declared as a friend", object);
6424 && (TREE_CODE (object) == TYPE_DECL
6425 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6426 && !TYPE_REFFN_P (TREE_TYPE (object))
6427 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6428 error ("%q+D declared with an exception specification", object);
6431 /* DECL is a member function or static data member and is presently
6432 being defined. Check that the definition is taking place in a
6436 check_class_member_definition_namespace (tree decl)
6438 /* These checks only apply to member functions and static data
6440 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6441 || TREE_CODE (decl) == VAR_DECL);
6442 /* We check for problems with specializations in pt.c in
6443 check_specialization_namespace, where we can issue better
6445 if (processing_specialization)
6447 /* There are no restrictions on the placement of
6448 explicit instantiations. */
6449 if (processing_explicit_instantiation)
6453 A member function definition that appears outside of the
6454 class definition shall appear in a namespace scope enclosing
6455 the class definition.
6459 The definition for a static data member shall appear in a
6460 namespace scope enclosing the member's class definition. */
6461 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6462 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6463 decl, DECL_CONTEXT (decl));
6466 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6467 METHOD_TYPE for a non-static member function; QUALS are the
6468 cv-qualifiers that apply to the function. */
6471 build_this_parm (tree type, cp_cv_quals quals)
6476 cp_cv_quals this_quals;
6478 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6479 /* The `this' parameter is implicitly `const'; it cannot be
6481 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6482 qual_type = cp_build_qualified_type (this_type, this_quals);
6483 parm = build_artificial_parm (this_identifier, qual_type);
6484 cp_apply_type_quals_to_decl (this_quals, parm);
6488 /* CTYPE is class type, or null if non-class.
6489 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6491 DECLARATOR is the function's name.
6492 PARMS is a chain of PARM_DECLs for the function.
6493 VIRTUALP is truthvalue of whether the function is virtual or not.
6494 FLAGS are to be passed through to `grokclassfn'.
6495 QUALS are qualifiers indicating whether the function is `const'
6497 RAISES is a list of exceptions that this function can raise.
6498 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6499 not look, and -1 if we should not call `grokclassfn' at all.
6501 SFK is the kind of special function (if any) for the new function.
6503 Returns `NULL_TREE' if something goes wrong, after issuing
6504 applicable error messages. */
6507 grokfndecl (tree ctype,
6511 tree orig_declarator,
6513 enum overload_flags flags,
6520 special_function_kind sfk,
6525 location_t location)
6528 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6532 type = build_exception_variant (type, raises);
6534 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6536 /* If we have an explicit location, use it, otherwise use whatever
6537 build_lang_decl used (probably input_location). */
6538 if (location != UNKNOWN_LOCATION)
6539 DECL_SOURCE_LOCATION (decl) = location;
6541 if (TREE_CODE (type) == METHOD_TYPE)
6544 parm = build_this_parm (type, quals);
6545 TREE_CHAIN (parm) = parms;
6548 DECL_ARGUMENTS (decl) = parms;
6549 /* Propagate volatile out from type to decl. */
6550 if (TYPE_VOLATILE (type))
6551 TREE_THIS_VOLATILE (decl) = 1;
6553 /* Setup decl according to sfk. */
6556 case sfk_constructor:
6557 case sfk_copy_constructor:
6558 DECL_CONSTRUCTOR_P (decl) = 1;
6560 case sfk_destructor:
6561 DECL_DESTRUCTOR_P (decl) = 1;
6567 /* If pointers to member functions use the least significant bit to
6568 indicate whether a function is virtual, ensure a pointer
6569 to this function will have that bit clear. */
6570 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6571 && TREE_CODE (type) == METHOD_TYPE
6572 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6573 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6576 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6580 ("defining explicit specialization %qD in friend declaration",
6584 tree fns = TREE_OPERAND (orig_declarator, 0);
6585 tree args = TREE_OPERAND (orig_declarator, 1);
6587 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6589 /* Something like `template <class T> friend void f<T>()'. */
6590 error ("invalid use of template-id %qD in declaration "
6591 "of primary template",
6597 /* A friend declaration of the form friend void f<>(). Record
6598 the information in the TEMPLATE_ID_EXPR. */
6599 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6601 if (TREE_CODE (fns) == COMPONENT_REF)
6603 /* Due to bison parser ickiness, we will have already looked
6604 up an operator_name or PFUNCNAME within the current class
6605 (see template_id in parse.y). If the current class contains
6606 such a name, we'll get a COMPONENT_REF here. Undo that. */
6608 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6609 == current_class_type);
6610 fns = TREE_OPERAND (fns, 1);
6612 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6613 || TREE_CODE (fns) == OVERLOAD);
6614 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6616 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6617 if (TREE_PURPOSE (t)
6618 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6620 error ("default arguments are not allowed in declaration "
6621 "of friend template specialization %qD",
6628 error ("%<inline%> is not allowed in declaration of friend "
6629 "template specialization %qD",
6636 /* If this decl has namespace scope, set that up. */
6638 set_decl_namespace (decl, in_namespace, friendp);
6640 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6642 /* `main' and builtins have implicit 'C' linkage. */
6643 if ((MAIN_NAME_P (declarator)
6644 || (IDENTIFIER_LENGTH (declarator) > 10
6645 && IDENTIFIER_POINTER (declarator)[0] == '_'
6646 && IDENTIFIER_POINTER (declarator)[1] == '_'
6647 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6648 && current_lang_name == lang_name_cplusplus
6649 && ctype == NULL_TREE
6650 /* NULL_TREE means global namespace. */
6651 && DECL_CONTEXT (decl) == NULL_TREE)
6652 SET_DECL_LANGUAGE (decl, lang_c);
6654 /* Should probably propagate const out from type to decl I bet (mrs). */
6657 DECL_STATIC_FUNCTION_P (decl) = 1;
6658 DECL_CONTEXT (decl) = ctype;
6663 DECL_CONTEXT (decl) = ctype;
6665 check_class_member_definition_namespace (decl);
6668 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6670 if (processing_template_decl)
6671 error ("cannot declare %<::main%> to be a template");
6673 error ("cannot declare %<::main%> to be inline");
6675 error ("cannot declare %<::main%> to be static");
6680 /* Members of anonymous types and local classes have no linkage; make
6681 them internal. If a typedef is made later, this will be changed. */
6682 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6683 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6688 /* [basic.link]: A name with no linkage (notably, the name of a class
6689 or enumeration declared in a local scope) shall not be used to
6690 declare an entity with linkage.
6692 Only check this for public decls for now. See core 319, 389. */
6693 t = no_linkage_check (TREE_TYPE (decl),
6694 /*relaxed_p=*/false);
6697 if (TYPE_ANONYMOUS_P (t))
6699 if (DECL_EXTERN_C_P (decl))
6700 /* Allow this; it's pretty common in C. */;
6703 permerror (input_location, "non-local function %q#D uses anonymous type",
6705 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6706 permerror (input_location, "%q+#D does not refer to the unqualified "
6707 "type, so it is not used for linkage",
6712 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6716 TREE_PUBLIC (decl) = publicp;
6719 DECL_INTERFACE_KNOWN (decl) = 1;
6720 DECL_NOT_REALLY_EXTERN (decl) = 1;
6723 /* If the declaration was declared inline, mark it as such. */
6725 DECL_DECLARED_INLINE_P (decl) = 1;
6727 DECL_EXTERNAL (decl) = 1;
6728 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6731 ? G_("static member function %qD cannot have cv-qualifier")
6732 : G_("non-member function %qD cannot have cv-qualifier"),
6734 quals = TYPE_UNQUALIFIED;
6737 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6738 && !grok_op_properties (decl, /*complain=*/true))
6741 if (ctype && decl_function_context (decl))
6742 DECL_NO_STATIC_CHAIN (decl) = 1;
6745 /* Make the init_value nonzero so pushdecl knows this is not
6746 tentative. error_mark_node is replaced later with the BLOCK. */
6747 DECL_INITIAL (decl) = error_mark_node;
6749 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6750 TREE_NOTHROW (decl) = 1;
6752 /* Caller will do the rest of this. */
6756 if (ctype != NULL_TREE)
6757 grokclassfn (ctype, decl, flags);
6759 decl = check_explicit_specialization (orig_declarator, decl,
6762 4 * (friendp != 0));
6763 if (decl == error_mark_node)
6768 cplus_decl_attributes (&decl, *attrlist, 0);
6769 *attrlist = NULL_TREE;
6772 /* Check main's type after attributes have been applied. */
6773 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6775 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6778 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6780 error ("%<::main%> must return %<int%>");
6781 newtype = build_function_type (integer_type_node, oldtypeargs);
6782 TREE_TYPE (decl) = newtype;
6785 check_main_parameter_types (decl);
6788 if (ctype != NULL_TREE
6789 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6792 tree old_decl = check_classfn (ctype, decl,
6793 (processing_template_decl
6794 > template_class_depth (ctype))
6795 ? current_template_parms
6798 if (old_decl == error_mark_node)
6806 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6807 /* Because grokfndecl is always supposed to return a
6808 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6809 here. We depend on our callers to figure out that its
6810 really a template that's being returned. */
6811 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6813 if (DECL_STATIC_FUNCTION_P (old_decl)
6814 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6815 /* Remove the `this' parm added by grokclassfn.
6816 XXX Isn't this done in start_function, too? */
6817 revert_static_member_fn (decl);
6818 if (DECL_ARTIFICIAL (old_decl))
6820 error ("definition of implicitly-declared %qD", old_decl);
6824 /* Since we've smashed OLD_DECL to its
6825 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6826 if (TREE_CODE (decl) == TEMPLATE_DECL)
6827 decl = DECL_TEMPLATE_RESULT (decl);
6829 /* Attempt to merge the declarations. This can fail, in
6830 the case of some invalid specialization declarations. */
6831 pushed_scope = push_scope (ctype);
6832 ok = duplicate_decls (decl, old_decl, friendp);
6834 pop_scope (pushed_scope);
6837 error ("no %q#D member function declared in class %qT",
6845 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6848 if (ctype == NULL_TREE || check)
6852 DECL_VIRTUAL_P (decl) = 1;
6857 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6858 the linkage that DECL will receive in the object file. */
6861 set_linkage_for_static_data_member (tree decl)
6863 /* A static data member always has static storage duration and
6864 external linkage. Note that static data members are forbidden in
6865 local classes -- the only situation in which a class has
6866 non-external linkage. */
6867 TREE_PUBLIC (decl) = 1;
6868 TREE_STATIC (decl) = 1;
6869 /* For non-template classes, static data members are always put
6870 out in exactly those files where they are defined, just as
6871 with ordinary namespace-scope variables. */
6872 if (!processing_template_decl)
6873 DECL_INTERFACE_KNOWN (decl) = 1;
6876 /* Create a VAR_DECL named NAME with the indicated TYPE.
6878 If SCOPE is non-NULL, it is the class type or namespace containing
6879 the variable. If SCOPE is NULL, the variable should is created in
6880 the innermost enclosings scope. */
6883 grokvardecl (tree type,
6885 const cp_decl_specifier_seq *declspecs,
6891 tree explicit_scope;
6893 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6895 /* Compute the scope in which to place the variable, but remember
6896 whether or not that scope was explicitly specified by the user. */
6897 explicit_scope = scope;
6900 /* An explicit "extern" specifier indicates a namespace-scope
6902 if (declspecs->storage_class == sc_extern)
6903 scope = current_namespace;
6904 else if (!at_function_scope_p ())
6905 scope = current_scope ();
6909 && (/* If the variable is a namespace-scope variable declared in a
6910 template, we need DECL_LANG_SPECIFIC. */
6911 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6912 /* Similarly for namespace-scope variables with language linkage
6914 || (TREE_CODE (scope) == NAMESPACE_DECL
6915 && current_lang_name != lang_name_cplusplus)
6916 /* Similarly for static data members. */
6918 decl = build_lang_decl (VAR_DECL, name, type);
6920 decl = build_decl (VAR_DECL, name, type);
6922 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6923 set_decl_namespace (decl, explicit_scope, 0);
6925 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6927 if (declspecs->storage_class == sc_extern)
6929 DECL_THIS_EXTERN (decl) = 1;
6930 DECL_EXTERNAL (decl) = !initialized;
6933 if (DECL_CLASS_SCOPE_P (decl))
6935 set_linkage_for_static_data_member (decl);
6936 /* This function is only called with out-of-class definitions. */
6937 DECL_EXTERNAL (decl) = 0;
6938 check_class_member_definition_namespace (decl);
6940 /* At top level, either `static' or no s.c. makes a definition
6941 (perhaps tentative), and absence of `static' makes it public. */
6942 else if (toplevel_bindings_p ())
6944 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6945 && (DECL_THIS_EXTERN (decl) || ! constp));
6946 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6948 /* Not at top level, only `static' makes a static definition. */
6951 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6952 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6955 if (declspecs->specs[(int)ds_thread])
6956 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6958 if (TREE_PUBLIC (decl))
6960 /* [basic.link]: A name with no linkage (notably, the name of a class
6961 or enumeration declared in a local scope) shall not be used to
6962 declare an entity with linkage.
6964 Only check this for public decls for now. */
6965 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6968 if (TYPE_ANONYMOUS_P (t))
6970 if (DECL_EXTERN_C_P (decl))
6971 /* Allow this; it's pretty common in C. */
6975 /* DRs 132, 319 and 389 seem to indicate types with
6976 no linkage can only be used to declare extern "C"
6977 entities. Since it's not always an error in the
6978 ISO C++ 90 Standard, we only issue a warning. */
6979 warning (0, "non-local variable %q#D uses anonymous type",
6981 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6982 warning (0, "%q+#D does not refer to the unqualified "
6983 "type, so it is not used for linkage",
6988 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6992 DECL_INTERFACE_KNOWN (decl) = 1;
6997 /* Create and return a canonical pointer to member function type, for
6998 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7001 build_ptrmemfunc_type (tree type)
7005 tree unqualified_variant = NULL_TREE;
7007 if (type == error_mark_node)
7010 /* If a canonical type already exists for this type, use it. We use
7011 this method instead of type_hash_canon, because it only does a
7012 simple equality check on the list of field members. */
7014 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7017 /* Make sure that we always have the unqualified pointer-to-member
7019 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7021 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7023 t = make_class_type (RECORD_TYPE);
7024 xref_basetypes (t, NULL_TREE);
7026 /* Let the front end know this is a pointer to member function... */
7027 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7028 /* ... and not really a class type. */
7029 SET_CLASS_TYPE_P (t, 0);
7031 field = build_decl (FIELD_DECL, pfn_identifier, type);
7034 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
7035 TREE_CHAIN (field) = fields;
7038 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7040 /* Zap out the name so that the back end will give us the debugging
7041 information for this anonymous RECORD_TYPE. */
7042 TYPE_NAME (t) = NULL_TREE;
7044 /* If this is not the unqualified form of this pointer-to-member
7045 type, set the TYPE_MAIN_VARIANT for this type to be the
7046 unqualified type. Since they are actually RECORD_TYPEs that are
7047 not variants of each other, we must do this manually. */
7048 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7050 t = build_qualified_type (t, cp_type_quals (type));
7051 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7052 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7053 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7054 TREE_TYPE (TYPE_BINFO (t)) = t;
7057 /* Cache this pointer-to-member type so that we can find it again
7059 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7061 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7062 SET_TYPE_STRUCTURAL_EQUALITY (t);
7063 else if (TYPE_CANONICAL (type) != type)
7064 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7069 /* Create and return a pointer to data member type. */
7072 build_ptrmem_type (tree class_type, tree member_type)
7074 if (TREE_CODE (member_type) == METHOD_TYPE)
7078 arg_types = TYPE_ARG_TYPES (member_type);
7079 class_type = (cp_build_qualified_type
7081 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7083 = build_method_type_directly (class_type,
7084 TREE_TYPE (member_type),
7085 TREE_CHAIN (arg_types));
7086 return build_ptrmemfunc_type (build_pointer_type (member_type));
7090 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7091 return build_offset_type (class_type, member_type);
7095 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7096 Check to see that the definition is valid. Issue appropriate error
7097 messages. Return 1 if the definition is particularly bad, or 0
7101 check_static_variable_definition (tree decl, tree type)
7103 /* Motion 10 at San Diego: If a static const integral data member is
7104 initialized with an integral constant expression, the initializer
7105 may appear either in the declaration (within the class), or in
7106 the definition, but not both. If it appears in the class, the
7107 member is a member constant. The file-scope definition is always
7109 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7111 error ("invalid in-class initialization of static data member "
7112 "of non-integral type %qT",
7114 /* If we just return the declaration, crashes will sometimes
7115 occur. We therefore return void_type_node, as if this were a
7116 friend declaration, to cause callers to completely ignore
7117 this declaration. */
7120 else if (!CP_TYPE_CONST_P (type))
7121 error ("ISO C++ forbids in-class initialization of non-const "
7122 "static member %qD",
7124 else if (!INTEGRAL_TYPE_P (type))
7125 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7126 "%qD of non-integral type %qT", decl, type);
7131 /* Given the SIZE (i.e., number of elements) in an array, compute an
7132 appropriate index type for the array. If non-NULL, NAME is the
7133 name of the thing being declared. */
7136 compute_array_index_type (tree name, tree size)
7140 tree abi_1_itype = NULL_TREE;
7142 if (error_operand_p (size))
7143 return error_mark_node;
7145 type = TREE_TYPE (size);
7146 /* The array bound must be an integer type. */
7147 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7150 error ("size of array %qD has non-integral type %qT", name, type);
7152 error ("size of array has non-integral type %qT", type);
7153 size = integer_one_node;
7154 type = TREE_TYPE (size);
7157 if (value_dependent_expression_p (size))
7159 /* We cannot do any checking for a value-dependent SIZE. Just
7160 build the index type and mark that it requires structural
7162 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7163 size, integer_one_node));
7164 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7168 if (!abi_version_at_least (2) && processing_template_decl)
7169 /* For abi-1, we handled all instances in templates the same way,
7170 even when they were non-dependent. This affects the manglings
7171 produced. So, we do the normal checking for non-dependent
7172 sizes, but at the end we'll return the same type that abi-1
7173 would have, but with TYPE_CANONICAL set to the "right"
7174 value that the current ABI would provide. */
7175 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7176 size, integer_one_node));
7178 /* The size might be the result of a cast. */
7179 STRIP_TYPE_NOPS (size);
7181 /* It might be a const variable or enumeration constant. */
7182 size = integral_constant_value (size);
7184 /* Normally, the array-bound will be a constant. */
7185 if (TREE_CODE (size) == INTEGER_CST)
7187 /* Check to see if the array bound overflowed. Make that an
7188 error, no matter how generous we're being. */
7189 constant_expression_error (size);
7191 /* An array must have a positive number of elements. */
7192 if (INT_CST_LT (size, integer_zero_node))
7195 error ("size of array %qD is negative", name);
7197 error ("size of array is negative");
7198 size = integer_one_node;
7200 /* As an extension we allow zero-sized arrays. We always allow
7201 them in system headers because glibc uses them. */
7202 else if (integer_zerop (size) && !in_system_header)
7205 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7207 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7210 else if (TREE_CONSTANT (size))
7212 /* `(int) &fn' is not a valid array bound. */
7214 error ("size of array %qD is not an integral constant-expression",
7217 error ("size of array is not an integral constant-expression");
7218 size = integer_one_node;
7220 else if (pedantic && warn_vla != 0)
7223 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7225 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7227 else if (warn_vla > 0)
7231 "variable length array %qD is used", name);
7234 "variable length array is used");
7237 if (processing_template_decl && !TREE_CONSTANT (size))
7238 /* A variable sized array. */
7239 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7242 HOST_WIDE_INT saved_processing_template_decl;
7244 /* Compute the index of the largest element in the array. It is
7245 one less than the number of elements in the array. We save
7246 and restore PROCESSING_TEMPLATE_DECL so that computations in
7247 cp_build_binary_op will be appropriately folded. */
7248 saved_processing_template_decl = processing_template_decl;
7249 processing_template_decl = 0;
7250 itype = cp_build_binary_op (input_location,
7252 cp_convert (ssizetype, size),
7253 cp_convert (ssizetype, integer_one_node),
7254 tf_warning_or_error);
7255 itype = fold (itype);
7256 processing_template_decl = saved_processing_template_decl;
7258 if (!TREE_CONSTANT (itype))
7259 /* A variable sized array. */
7260 itype = variable_size (itype);
7261 /* Make sure that there was no overflow when creating to a signed
7262 index type. (For example, on a 32-bit machine, an array with
7263 size 2^32 - 1 is too big.) */
7264 else if (TREE_CODE (itype) == INTEGER_CST
7265 && TREE_OVERFLOW (itype))
7267 error ("overflow in array dimension");
7268 TREE_OVERFLOW (itype) = 0;
7272 /* Create and return the appropriate index type. */
7275 tree t = build_index_type (itype);
7276 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7280 return build_index_type (itype);
7283 /* Returns the scope (if any) in which the entity declared by
7284 DECLARATOR will be located. If the entity was declared with an
7285 unqualified name, NULL_TREE is returned. */
7288 get_scope_of_declarator (const cp_declarator *declarator)
7290 while (declarator && declarator->kind != cdk_id)
7291 declarator = declarator->declarator;
7293 /* If the declarator-id is a SCOPE_REF, the scope in which the
7294 declaration occurs is the first operand. */
7296 && declarator->u.id.qualifying_scope)
7297 return declarator->u.id.qualifying_scope;
7299 /* Otherwise, the declarator is not a qualified name; the entity will
7300 be declared in the current scope. */
7304 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7305 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7309 create_array_type_for_decl (tree name, tree type, tree size)
7311 tree itype = NULL_TREE;
7312 const char* error_msg;
7314 /* If things have already gone awry, bail now. */
7315 if (type == error_mark_node || size == error_mark_node)
7316 return error_mark_node;
7318 /* Assume that everything will go OK. */
7321 /* There are some types which cannot be array elements. */
7322 switch (TREE_CODE (type))
7325 error_msg = "array of void";
7329 error_msg = "array of functions";
7332 case REFERENCE_TYPE:
7333 error_msg = "array of references";
7337 error_msg = "array of function members";
7344 /* If something went wrong, issue an error-message and return. */
7348 error ("declaration of %qD as %s", name, error_msg);
7350 error ("creating %s", error_msg);
7352 return error_mark_node;
7357 The constant expressions that specify the bounds of the arrays
7358 can be omitted only for the first member of the sequence. */
7359 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7362 error ("declaration of %qD as multidimensional array must "
7363 "have bounds for all dimensions except the first",
7366 error ("multidimensional array must have bounds for all "
7367 "dimensions except the first");
7369 return error_mark_node;
7372 /* Figure out the index type for the array. */
7374 itype = compute_array_index_type (name, size);
7377 T is called the array element type; this type shall not be [...] an
7378 abstract class type. */
7379 abstract_virtuals_error (name, type);
7381 return build_cplus_array_type (type, itype);
7384 /* Check that it's OK to declare a function with the indicated TYPE.
7385 SFK indicates the kind of special function (if any) that this
7386 function is. OPTYPE is the type given in a conversion operator
7387 declaration, or the class type for a constructor/destructor.
7388 Returns the actual return type of the function; that
7389 may be different than TYPE if an error occurs, or for certain
7390 special functions. */
7393 check_special_function_return_type (special_function_kind sfk,
7399 case sfk_constructor:
7401 error ("return type specification for constructor invalid");
7403 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7404 type = build_pointer_type (optype);
7406 type = void_type_node;
7409 case sfk_destructor:
7411 error ("return type specification for destructor invalid");
7412 /* We can't use the proper return type here because we run into
7413 problems with ambiguous bases and covariant returns.
7414 Java classes are left unchanged because (void *) isn't a valid
7415 Java type, and we don't want to change the Java ABI. */
7416 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7417 type = build_pointer_type (void_type_node);
7419 type = void_type_node;
7422 case sfk_conversion:
7424 error ("return type specified for %<operator %T%>", optype);
7435 /* A variable or data member (whose unqualified name is IDENTIFIER)
7436 has been declared with the indicated TYPE. If the TYPE is not
7437 acceptable, issue an error message and return a type to use for
7438 error-recovery purposes. */
7441 check_var_type (tree identifier, tree type)
7443 if (VOID_TYPE_P (type))
7446 error ("unnamed variable or field declared void");
7447 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7449 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7450 error ("variable or field %qE declared void", identifier);
7453 error ("variable or field declared void");
7454 type = error_mark_node;
7460 /* Given declspecs and a declarator (abstract or otherwise), determine
7461 the name and type of the object declared and construct a DECL node
7464 DECLSPECS points to the representation of declaration-specifier
7465 sequence that precedes declarator.
7467 DECL_CONTEXT says which syntactic context this declaration is in:
7468 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7469 FUNCDEF for a function definition. Like NORMAL but a few different
7470 error messages in each case. Return value may be zero meaning
7471 this definition is too screwy to try to parse.
7472 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7473 handle member functions (which have FIELD context).
7474 Return value may be zero meaning this definition is too screwy to
7476 PARM for a parameter declaration (either within a function prototype
7477 or before a function body). Make a PARM_DECL, or return void_type_node.
7478 CATCHPARM for a parameter declaration before a catch clause.
7479 TYPENAME if for a typename (in a cast or sizeof).
7480 Don't make a DECL node; just return the ..._TYPE node.
7481 FIELD for a struct or union field; make a FIELD_DECL.
7482 BITFIELD for a field with specified width.
7483 INITIALIZED is as for start_decl.
7485 ATTRLIST is a pointer to the list of attributes, which may be NULL
7486 if there are none; *ATTRLIST may be modified if attributes from inside
7487 the declarator should be applied to the declaration.
7489 When this function is called, scoping variables (such as
7490 CURRENT_CLASS_TYPE) should reflect the scope in which the
7491 declaration occurs, not the scope in which the new declaration will
7492 be placed. For example, on:
7496 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7499 Returns a DECL (if a declarator is present), a TYPE (if there is no
7500 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7504 grokdeclarator (const cp_declarator *declarator,
7505 const cp_decl_specifier_seq *declspecs,
7506 enum decl_context decl_context,
7510 tree type = NULL_TREE;
7512 int virtualp, explicitp, friendp, inlinep, staticp;
7513 int explicit_int = 0;
7514 int explicit_char = 0;
7515 int defaulted_int = 0;
7516 tree dependent_name = NULL_TREE;
7518 tree typedef_decl = NULL_TREE;
7519 const char *name = NULL;
7520 tree typedef_type = NULL_TREE;
7521 /* True if this declarator is a function definition. */
7522 bool funcdef_flag = false;
7523 cp_declarator_kind innermost_code = cdk_error;
7526 /* See the code below that used this. */
7527 tree decl_attr = NULL_TREE;
7530 /* Keep track of what sort of function is being processed
7531 so that we can warn about default return values, or explicit
7532 return values which do not match prescribed defaults. */
7533 special_function_kind sfk = sfk_none;
7535 tree dname = NULL_TREE;
7536 tree ctor_return_type = NULL_TREE;
7537 enum overload_flags flags = NO_SPECIAL;
7538 /* cv-qualifiers that apply to the declarator, for a declaration of
7539 a member function. */
7540 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7541 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7543 tree raises = NULL_TREE;
7544 int template_count = 0;
7545 tree returned_attrs = NULL_TREE;
7546 tree parms = NULL_TREE;
7547 const cp_declarator *id_declarator;
7548 /* The unqualified name of the declarator; either an
7549 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7550 tree unqualified_id;
7551 /* The class type, if any, in which this entity is located,
7552 or NULL_TREE if none. Note that this value may be different from
7553 the current class type; for example if an attempt is made to declare
7554 "A::f" inside "B", this value will be "A". */
7555 tree ctype = current_class_type;
7556 /* The NAMESPACE_DECL for the namespace in which this entity is
7557 located. If an unqualified name is used to declare the entity,
7558 this value will be NULL_TREE, even if the entity is located at
7560 tree in_namespace = NULL_TREE;
7561 cp_storage_class storage_class;
7562 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7563 bool type_was_error_mark_node = false;
7564 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7565 bool set_no_warning = false;
7567 signed_p = declspecs->specs[(int)ds_signed];
7568 unsigned_p = declspecs->specs[(int)ds_unsigned];
7569 short_p = declspecs->specs[(int)ds_short];
7570 long_p = declspecs->specs[(int)ds_long];
7571 longlong = declspecs->specs[(int)ds_long] >= 2;
7572 thread_p = declspecs->specs[(int)ds_thread];
7574 if (decl_context == FUNCDEF)
7575 funcdef_flag = true, decl_context = NORMAL;
7576 else if (decl_context == MEMFUNCDEF)
7577 funcdef_flag = true, decl_context = FIELD;
7578 else if (decl_context == BITFIELD)
7579 bitfield = 1, decl_context = FIELD;
7581 if (initialized > 1)
7582 funcdef_flag = true;
7584 /* Look inside a declarator for the name being declared
7585 and get it as a string, for an error message. */
7586 for (id_declarator = declarator;
7588 id_declarator = id_declarator->declarator)
7590 if (id_declarator->kind != cdk_id)
7591 innermost_code = id_declarator->kind;
7593 switch (id_declarator->kind)
7596 if (id_declarator->declarator
7597 && id_declarator->declarator->kind == cdk_id)
7599 sfk = id_declarator->declarator->u.id.sfk;
7600 if (sfk == sfk_destructor)
7607 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7608 tree decl = id_declarator->u.id.unqualified_name;
7611 if (qualifying_scope)
7613 if (at_function_scope_p ())
7617 A declarator-id shall not be qualified except
7620 None of the cases are permitted in block
7622 if (qualifying_scope == global_namespace)
7623 error ("invalid use of qualified-name %<::%D%>",
7625 else if (TYPE_P (qualifying_scope))
7626 error ("invalid use of qualified-name %<%T::%D%>",
7627 qualifying_scope, decl);
7629 error ("invalid use of qualified-name %<%D::%D%>",
7630 qualifying_scope, decl);
7631 return error_mark_node;
7633 else if (TYPE_P (qualifying_scope))
7635 ctype = qualifying_scope;
7636 if (innermost_code != cdk_function
7637 && current_class_type
7638 && !UNIQUELY_DERIVED_FROM_P (ctype,
7639 current_class_type))
7641 error ("type %qT is not derived from type %qT",
7642 ctype, current_class_type);
7643 return error_mark_node;
7646 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7647 in_namespace = qualifying_scope;
7649 switch (TREE_CODE (decl))
7655 if (innermost_code != cdk_function)
7657 error ("declaration of %qD as non-function", decl);
7658 return error_mark_node;
7660 else if (!qualifying_scope
7661 && !(current_class_type && at_class_scope_p ()))
7663 error ("declaration of %qD as non-member", decl);
7664 return error_mark_node;
7667 type = TREE_OPERAND (decl, 0);
7669 type = constructor_name (type);
7670 name = IDENTIFIER_POINTER (type);
7675 case TEMPLATE_ID_EXPR:
7677 tree fns = TREE_OPERAND (decl, 0);
7680 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7682 gcc_assert (is_overloaded_fn (dname));
7683 dname = DECL_NAME (get_first_fn (dname));
7688 case IDENTIFIER_NODE:
7689 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7692 if (C_IS_RESERVED_WORD (dname))
7694 error ("declarator-id missing; using reserved word %qD",
7696 name = IDENTIFIER_POINTER (dname);
7698 else if (!IDENTIFIER_TYPENAME_P (dname))
7699 name = IDENTIFIER_POINTER (dname);
7702 gcc_assert (flags == NO_SPECIAL);
7703 flags = TYPENAME_FLAG;
7704 ctor_return_type = TREE_TYPE (dname);
7705 sfk = sfk_conversion;
7706 if (is_typename_at_global_scope (dname))
7707 name = IDENTIFIER_POINTER (dname);
7709 name = "<invalid operator>";
7726 return error_mark_node;
7731 if (id_declarator->kind == cdk_id)
7737 The declarator in a function-definition shall have the form
7738 D1 ( parameter-declaration-clause) ... */
7739 if (funcdef_flag && innermost_code != cdk_function)
7741 error ("function definition does not declare parameters");
7742 return error_mark_node;
7745 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7746 && innermost_code != cdk_function
7747 && ! (ctype && !declspecs->any_specifiers_p))
7749 error ("declaration of %qD as non-function", dname);
7750 return error_mark_node;
7753 /* Anything declared one level down from the top level
7754 must be one of the parameters of a function
7755 (because the body is at least two levels down). */
7757 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7758 by not allowing C++ class definitions to specify their parameters
7759 with xdecls (must be spec.d in the parmlist).
7761 Since we now wait to push a class scope until we are sure that
7762 we are in a legitimate method context, we must set oldcname
7763 explicitly (since current_class_name is not yet alive).
7765 We also want to avoid calling this a PARM if it is in a namespace. */
7767 if (decl_context == NORMAL && !toplevel_bindings_p ())
7769 struct cp_binding_level *b = current_binding_level;
7770 current_binding_level = b->level_chain;
7771 if (current_binding_level != 0 && toplevel_bindings_p ())
7772 decl_context = PARM;
7773 current_binding_level = b;
7777 name = decl_context == PARM ? "parameter" : "type name";
7779 /* If there were multiple types specified in the decl-specifier-seq,
7780 issue an error message. */
7781 if (declspecs->multiple_types_p)
7783 error ("two or more data types in declaration of %qs", name);
7784 return error_mark_node;
7787 if (declspecs->conflicting_specifiers_p)
7789 error ("conflicting specifiers in declaration of %qs", name);
7790 return error_mark_node;
7793 /* Extract the basic type from the decl-specifier-seq. */
7794 type = declspecs->type;
7795 if (type == error_mark_node)
7798 type_was_error_mark_node = true;
7800 /* If the entire declaration is itself tagged as deprecated then
7801 suppress reports of deprecated items. */
7802 if (type && TREE_DEPRECATED (type)
7803 && deprecated_state != DEPRECATED_SUPPRESS)
7804 warn_deprecated_use (type);
7805 if (type && TREE_CODE (type) == TYPE_DECL)
7807 typedef_decl = type;
7808 type = TREE_TYPE (typedef_decl);
7809 if (TREE_DEPRECATED (type)
7810 && DECL_ARTIFICIAL (typedef_decl)
7811 && deprecated_state != DEPRECATED_SUPPRESS)
7812 warn_deprecated_use (type);
7814 /* No type at all: default to `int', and set DEFAULTED_INT
7815 because it was not a user-defined typedef. */
7816 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7818 /* These imply 'int'. */
7819 type = integer_type_node;
7823 explicit_int = declspecs->explicit_int_p;
7824 explicit_char = declspecs->explicit_char_p;
7827 /* See the code below that used this. */
7829 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7831 typedef_type = type;
7834 if (sfk != sfk_conversion)
7835 ctor_return_type = ctype;
7837 if (sfk != sfk_none)
7838 type = check_special_function_return_type (sfk, type,
7840 else if (type == NULL_TREE)
7846 /* We handle `main' specially here, because 'main () { }' is so
7847 common. With no options, it is allowed. With -Wreturn-type,
7848 it is a warning. It is only an error with -pedantic-errors. */
7849 is_main = (funcdef_flag
7850 && dname && MAIN_NAME_P (dname)
7851 && ctype == NULL_TREE
7852 && in_namespace == NULL_TREE
7853 && current_namespace == global_namespace);
7855 if (type_was_error_mark_node)
7856 /* We've already issued an error, don't complain more. */;
7857 else if (in_system_header || flag_ms_extensions)
7858 /* Allow it, sigh. */;
7860 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7862 pedwarn (input_location, OPT_pedantic,
7863 "ISO C++ forbids declaration of %qs with no type", name);
7865 warning (OPT_Wreturn_type,
7866 "ISO C++ forbids declaration of %qs with no type", name);
7868 type = integer_type_node;
7873 /* Now process the modifiers that were specified
7874 and check for invalid combinations. */
7876 /* Long double is a special combination. */
7877 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7880 type = build_qualified_type (long_double_type_node,
7881 cp_type_quals (type));
7884 /* Check all other uses of type modifiers. */
7886 if (unsigned_p || signed_p || long_p || short_p)
7890 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7891 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7892 else if (signed_p && unsigned_p)
7893 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7894 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7895 error ("%<long long%> invalid for %qs", name);
7896 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7897 error ("%<long%> invalid for %qs", name);
7898 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7899 error ("%<short%> invalid for %qs", name);
7900 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7901 error ("%<long%> or %<short%> invalid for %qs", name);
7902 else if ((long_p || short_p) && explicit_char)
7903 error ("%<long%> or %<short%> specified with char for %qs", name);
7904 else if (long_p && short_p)
7905 error ("%<long%> and %<short%> specified together for %qs", name);
7906 else if (type == char16_type_node || type == char32_type_node)
7908 if (signed_p || unsigned_p)
7909 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7910 else if (short_p || long_p)
7911 error ("%<short%> or %<long%> invalid for %qs", name);
7916 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7918 pedwarn (input_location, OPT_pedantic,
7919 "long, short, signed or unsigned used invalidly for %qs",
7921 if (flag_pedantic_errors)
7926 /* Discard the type modifiers if they are invalid. */
7937 /* Decide whether an integer type is signed or not.
7938 Optionally treat bitfields as signed by default. */
7942 It is implementation-defined whether a plain (neither
7943 explicitly signed or unsigned) char, short, int, or long
7944 bit-field is signed or unsigned.
7946 Naturally, we extend this to long long as well. Note that
7947 this does not include wchar_t. */
7948 || (bitfield && !flag_signed_bitfields
7950 /* A typedef for plain `int' without `signed' can be
7951 controlled just like plain `int', but a typedef for
7952 `signed int' cannot be so controlled. */
7954 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7955 && TREE_CODE (type) == INTEGER_TYPE
7956 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7959 type = long_long_unsigned_type_node;
7961 type = long_unsigned_type_node;
7963 type = short_unsigned_type_node;
7964 else if (type == char_type_node)
7965 type = unsigned_char_type_node;
7966 else if (typedef_decl)
7967 type = unsigned_type_for (type);
7969 type = unsigned_type_node;
7971 else if (signed_p && type == char_type_node)
7972 type = signed_char_type_node;
7974 type = long_long_integer_type_node;
7976 type = long_integer_type_node;
7978 type = short_integer_type_node;
7980 if (declspecs->specs[(int)ds_complex])
7982 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7983 error ("complex invalid for %qs", name);
7984 /* If we just have "complex", it is equivalent to
7985 "complex double", but if any modifiers at all are specified it is
7986 the complex form of TYPE. E.g, "complex short" is
7987 "complex short int". */
7989 else if (defaulted_int && ! longlong
7990 && ! (long_p || short_p || signed_p || unsigned_p))
7991 type = complex_double_type_node;
7992 else if (type == integer_type_node)
7993 type = complex_integer_type_node;
7994 else if (type == float_type_node)
7995 type = complex_float_type_node;
7996 else if (type == double_type_node)
7997 type = complex_double_type_node;
7998 else if (type == long_double_type_node)
7999 type = complex_long_double_type_node;
8001 type = build_complex_type (type);
8004 type_quals = TYPE_UNQUALIFIED;
8005 if (declspecs->specs[(int)ds_const])
8006 type_quals |= TYPE_QUAL_CONST;
8007 if (declspecs->specs[(int)ds_volatile])
8008 type_quals |= TYPE_QUAL_VOLATILE;
8009 if (declspecs->specs[(int)ds_restrict])
8010 type_quals |= TYPE_QUAL_RESTRICT;
8011 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8012 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8015 if (TREE_CODE (type) == FUNCTION_TYPE
8016 && type_quals != TYPE_UNQUALIFIED)
8018 /* This was an error in C++98 (cv-qualifiers cannot be added to
8019 a function type), but DR 295 makes the code well-formed by
8020 dropping the extra qualifiers. */
8023 tree bad_type = build_qualified_type (type, type_quals);
8024 pedwarn (input_location, OPT_pedantic,
8025 "ignoring %qV qualifiers added to function type %qT",
8028 type_quals = TYPE_UNQUALIFIED;
8030 type_quals |= cp_type_quals (type);
8031 type = cp_build_qualified_type_real
8032 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8033 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8034 /* We might have ignored or rejected some of the qualifiers. */
8035 type_quals = cp_type_quals (type);
8038 inlinep = !! declspecs->specs[(int)ds_inline];
8039 virtualp = !! declspecs->specs[(int)ds_virtual];
8040 explicitp = !! declspecs->specs[(int)ds_explicit];
8042 storage_class = declspecs->storage_class;
8043 if (storage_class == sc_static)
8044 staticp = 1 + (decl_context == FIELD);
8046 if (virtualp && staticp == 2)
8048 error ("member %qD cannot be declared both virtual and static", dname);
8049 storage_class = sc_none;
8052 friendp = !! declspecs->specs[(int)ds_friend];
8054 if (dependent_name && !friendp)
8056 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8057 return error_mark_node;
8060 /* Issue errors about use of storage classes for parameters. */
8061 if (decl_context == PARM)
8063 if (declspecs->specs[(int)ds_typedef])
8065 error ("typedef declaration invalid in parameter declaration");
8066 return error_mark_node;
8068 else if (storage_class == sc_static
8069 || storage_class == sc_extern
8071 error ("storage class specifiers invalid in parameter declarations");
8073 if (type_uses_auto (type))
8075 error ("parameter declared %<auto%>");
8076 type = error_mark_node;
8080 /* Give error if `virtual' is used outside of class declaration. */
8082 && (current_class_name == NULL_TREE || decl_context != FIELD))
8084 error ("%<virtual%> outside class declaration");
8088 /* Static anonymous unions are dealt with here. */
8089 if (staticp && decl_context == TYPENAME
8091 && ANON_AGGR_TYPE_P (declspecs->type))
8092 decl_context = FIELD;
8094 /* Warn about storage classes that are invalid for certain
8095 kinds of declarations (parameters, typenames, etc.). */
8098 && storage_class != sc_extern
8099 && storage_class != sc_static)
8100 || declspecs->specs[(int)ds_typedef]))
8102 error ("multiple storage classes in declaration of %qs", name);
8105 if (decl_context != NORMAL
8106 && ((storage_class != sc_none
8107 && storage_class != sc_mutable)
8110 if ((decl_context == PARM || decl_context == CATCHPARM)
8111 && (storage_class == sc_register
8112 || storage_class == sc_auto))
8114 else if (declspecs->specs[(int)ds_typedef])
8116 else if (decl_context == FIELD
8117 /* C++ allows static class elements. */
8118 && storage_class == sc_static)
8119 /* C++ also allows inlines and signed and unsigned elements,
8120 but in those cases we don't come in here. */
8124 if (decl_context == FIELD)
8125 error ("storage class specified for %qs", name);
8128 if (decl_context == PARM || decl_context == CATCHPARM)
8129 error ("storage class specified for parameter %qs", name);
8131 error ("storage class specified for typename");
8133 if (storage_class == sc_register
8134 || storage_class == sc_auto
8135 || storage_class == sc_extern
8137 storage_class = sc_none;
8140 else if (storage_class == sc_extern && funcdef_flag
8141 && ! toplevel_bindings_p ())
8142 error ("nested function %qs declared %<extern%>", name);
8143 else if (toplevel_bindings_p ())
8145 if (storage_class == sc_auto)
8146 error ("top-level declaration of %qs specifies %<auto%>", name);
8149 && storage_class != sc_extern
8150 && storage_class != sc_static)
8152 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8157 if (storage_class && friendp)
8159 error ("storage class specifiers invalid in friend function declarations");
8160 storage_class = sc_none;
8165 unqualified_id = NULL_TREE;
8168 unqualified_id = id_declarator->u.id.unqualified_name;
8169 switch (TREE_CODE (unqualified_id))
8172 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8173 if (TYPE_P (unqualified_id))
8174 unqualified_id = constructor_name (unqualified_id);
8177 case IDENTIFIER_NODE:
8178 case TEMPLATE_ID_EXPR:
8186 /* Determine the type of the entity declared by recurring on the
8188 for (; declarator; declarator = declarator->declarator)
8190 const cp_declarator *inner_declarator;
8193 if (type == error_mark_node)
8194 return error_mark_node;
8196 attrs = declarator->attributes;
8202 if (declarator == NULL || declarator->kind == cdk_id)
8203 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8204 if (declarator->kind == cdk_function)
8205 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8206 if (declarator->kind == cdk_array)
8207 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8208 returned_attrs = decl_attributes (&type,
8209 chainon (returned_attrs, attrs),
8213 if (declarator->kind == cdk_id)
8216 inner_declarator = declarator->declarator;
8218 switch (declarator->kind)
8221 type = create_array_type_for_decl (dname, type,
8222 declarator->u.array.bounds);
8230 /* Declaring a function type.
8231 Make sure we have a valid type for the function to return. */
8233 if (type_quals != TYPE_UNQUALIFIED)
8235 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8236 warning (OPT_Wignored_qualifiers,
8237 "type qualifiers ignored on function return type");
8238 /* We now know that the TYPE_QUALS don't apply to the
8239 decl, but to its return type. */
8240 type_quals = TYPE_UNQUALIFIED;
8241 set_no_warning = true;
8244 /* Error about some types functions can't return. */
8246 if (TREE_CODE (type) == FUNCTION_TYPE)
8248 error ("%qs declared as function returning a function", name);
8249 return error_mark_node;
8251 if (TREE_CODE (type) == ARRAY_TYPE)
8253 error ("%qs declared as function returning an array", name);
8254 return error_mark_node;
8257 /* Pick up type qualifiers which should be applied to `this'. */
8258 memfn_quals = declarator->u.function.qualifiers;
8260 /* Pick up the exception specifications. */
8261 raises = declarator->u.function.exception_specification;
8263 /* Say it's a definition only for the CALL_EXPR
8264 closest to the identifier. */
8265 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8267 /* Handle a late-specified return type. */
8270 if (type_uses_auto (type))
8272 if (!declarator->u.function.late_return_type)
8274 error ("%qs function uses %<auto%> type specifier without"
8275 " late return type", name);
8276 return error_mark_node;
8278 else if (!is_auto (type))
8280 error ("%qs function with late return type has"
8281 " %qT as its type rather than plain %<auto%>",
8283 return error_mark_node;
8286 else if (declarator->u.function.late_return_type)
8288 error ("%qs function with late return type not declared"
8289 " with %<auto%> type specifier", name);
8290 return error_mark_node;
8293 type = splice_late_return_type
8294 (type, declarator->u.function.late_return_type);
8295 if (type == error_mark_node)
8296 return error_mark_node;
8298 if (ctype == NULL_TREE
8299 && decl_context == FIELD
8301 && (friendp == 0 || dname == current_class_name))
8302 ctype = current_class_type;
8304 if (ctype && (sfk == sfk_constructor
8305 || sfk == sfk_destructor))
8307 /* We are within a class's scope. If our declarator name
8308 is the same as the class name, and we are defining
8309 a function, then it is a constructor/destructor, and
8310 therefore returns a void type. */
8312 /* ISO C++ 12.4/2. A destructor may not be declared
8313 const or volatile. A destructor may not be
8316 ISO C++ 12.1. A constructor may not be declared
8317 const or volatile. A constructor may not be
8318 virtual. A constructor may not be static. */
8320 error ((flags == DTOR_FLAG)
8321 ? "destructor cannot be static member function"
8322 : "constructor cannot be static member function");
8325 error ((flags == DTOR_FLAG)
8326 ? "destructors may not be cv-qualified"
8327 : "constructors may not be cv-qualified");
8328 memfn_quals = TYPE_UNQUALIFIED;
8331 if (decl_context == FIELD
8332 && !member_function_or_else (ctype,
8335 return error_mark_node;
8337 if (flags != DTOR_FLAG)
8339 /* It's a constructor. */
8344 permerror (input_location, "constructors cannot be declared virtual");
8347 if (decl_context == FIELD
8348 && sfk != sfk_constructor)
8349 return error_mark_node;
8351 if (decl_context == FIELD)
8357 error ("can't initialize friend function %qs", name);
8360 /* Cannot be both friend and virtual. */
8361 error ("virtual functions cannot be friends");
8364 if (decl_context == NORMAL)
8365 error ("friend declaration not in class definition");
8366 if (current_function_decl && funcdef_flag)
8367 error ("can't define friend function %qs in a local "
8372 arg_types = grokparms (declarator->u.function.parameters,
8375 if (inner_declarator
8376 && inner_declarator->kind == cdk_id
8377 && inner_declarator->u.id.sfk == sfk_destructor
8378 && arg_types != void_list_node)
8380 error ("destructors may not have parameters");
8381 arg_types = void_list_node;
8385 type = build_function_type (type, arg_types);
8392 /* Filter out pointers-to-references and references-to-references.
8393 We can get these if a TYPE_DECL is used. */
8395 if (TREE_CODE (type) == REFERENCE_TYPE)
8397 if (declarator->kind != cdk_reference)
8399 error ("cannot declare pointer to %q#T", type);
8400 type = TREE_TYPE (type);
8403 /* In C++0x, we allow reference to reference declarations
8404 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8405 and template type arguments [14.3.1/4 temp.arg.type]. The
8406 check for direct reference to reference declarations, which
8407 are still forbidden, occurs below. Reasoning behind the change
8408 can be found in DR106, DR540, and the rvalue reference
8410 else if (cxx_dialect == cxx98)
8412 error ("cannot declare reference to %q#T", type);
8413 type = TREE_TYPE (type);
8416 else if (VOID_TYPE_P (type))
8418 if (declarator->kind == cdk_reference)
8419 error ("cannot declare reference to %q#T", type);
8420 else if (declarator->kind == cdk_ptrmem)
8421 error ("cannot declare pointer to %q#T member", type);
8424 /* We now know that the TYPE_QUALS don't apply to the decl,
8425 but to the target of the pointer. */
8426 type_quals = TYPE_UNQUALIFIED;
8428 if (declarator->kind == cdk_ptrmem
8429 && (TREE_CODE (type) == FUNCTION_TYPE
8430 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8432 memfn_quals |= cp_type_quals (type);
8433 type = build_memfn_type (type,
8434 declarator->u.pointer.class_type,
8436 memfn_quals = TYPE_UNQUALIFIED;
8439 if (declarator->kind == cdk_reference)
8441 /* In C++0x, the type we are creating a reference to might be
8442 a typedef which is itself a reference type. In that case,
8443 we follow the reference collapsing rules in
8444 [7.1.3/8 dcl.typedef] to create the final reference type:
8446 "If a typedef TD names a type that is a reference to a type
8447 T, an attempt to create the type 'lvalue reference to cv TD'
8448 creates the type 'lvalue reference to T,' while an attempt
8449 to create the type "rvalue reference to cv TD' creates the
8452 if (!VOID_TYPE_P (type))
8453 type = cp_build_reference_type
8454 ((TREE_CODE (type) == REFERENCE_TYPE
8455 ? TREE_TYPE (type) : type),
8456 (declarator->u.reference.rvalue_ref
8457 && (TREE_CODE(type) != REFERENCE_TYPE
8458 || TYPE_REF_IS_RVALUE (type))));
8460 /* In C++0x, we need this check for direct reference to
8461 reference declarations, which are forbidden by
8462 [8.3.2/5 dcl.ref]. Reference to reference declarations
8463 are only allowed indirectly through typedefs and template
8464 type arguments. Example:
8466 void foo(int & &); // invalid ref-to-ref decl
8468 typedef int & int_ref;
8469 void foo(int_ref &); // valid ref-to-ref decl
8471 if (inner_declarator && inner_declarator->kind == cdk_reference)
8472 error ("cannot declare reference to %q#T, which is not "
8473 "a typedef or a template type argument", type);
8475 else if (TREE_CODE (type) == METHOD_TYPE)
8476 type = build_ptrmemfunc_type (build_pointer_type (type));
8477 else if (declarator->kind == cdk_ptrmem)
8479 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8481 if (declarator->u.pointer.class_type == error_mark_node)
8482 /* We will already have complained. */
8483 type = error_mark_node;
8485 type = build_ptrmem_type (declarator->u.pointer.class_type,
8489 type = build_pointer_type (type);
8491 /* Process a list of type modifier keywords (such as
8492 const or volatile) that were given inside the `*' or `&'. */
8494 if (declarator->u.pointer.qualifiers)
8497 = cp_build_qualified_type (type,
8498 declarator->u.pointer.qualifiers);
8499 type_quals = cp_type_quals (type);
8512 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8513 && TREE_CODE (type) != FUNCTION_TYPE
8514 && TREE_CODE (type) != METHOD_TYPE)
8516 error ("template-id %qD used as a declarator",
8518 unqualified_id = dname;
8521 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8522 qualified with a class-name, turn it into a METHOD_TYPE, unless
8523 we know that the function is static. We take advantage of this
8524 opportunity to do other processing that pertains to entities
8525 explicitly declared to be class members. Note that if DECLARATOR
8526 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8527 would not have exited the loop above. */
8529 && declarator->u.id.qualifying_scope
8530 && TYPE_P (declarator->u.id.qualifying_scope))
8534 ctype = declarator->u.id.qualifying_scope;
8535 ctype = TYPE_MAIN_VARIANT (ctype);
8537 while (t != NULL_TREE && CLASS_TYPE_P (t))
8539 /* You're supposed to have one `template <...>' for every
8540 template class, but you don't need one for a full
8541 specialization. For example:
8543 template <class T> struct S{};
8544 template <> struct S<int> { void f(); };
8545 void S<int>::f () {}
8547 is correct; there shouldn't be a `template <>' for the
8548 definition of `S<int>::f'. */
8549 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8550 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8551 /* T is an explicit (not partial) specialization. All
8552 containing classes must therefore also be explicitly
8555 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8556 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8557 template_count += 1;
8559 t = TYPE_MAIN_DECL (t);
8560 t = DECL_CONTEXT (t);
8563 if (ctype == current_class_type)
8567 permerror (input_location, "member functions are implicitly friends of their class");
8571 permerror (declarator->id_loc,
8572 "extra qualification %<%T::%> on member %qs",
8575 else if (/* If the qualifying type is already complete, then we
8576 can skip the following checks. */
8577 !COMPLETE_TYPE_P (ctype)
8578 && (/* If the function is being defined, then
8579 qualifying type must certainly be complete. */
8581 /* A friend declaration of "T::f" is OK, even if
8582 "T" is a template parameter. But, if this
8583 function is not a friend, the qualifying type
8585 || (!friendp && !CLASS_TYPE_P (ctype))
8586 /* For a declaration, the type need not be
8587 complete, if either it is dependent (since there
8588 is no meaningful definition of complete in that
8589 case) or the qualifying class is currently being
8591 || !(dependent_type_p (ctype)
8592 || currently_open_class (ctype)))
8593 /* Check that the qualifying type is complete. */
8594 && !complete_type_or_else (ctype, NULL_TREE))
8595 return error_mark_node;
8596 else if (TREE_CODE (type) == FUNCTION_TYPE)
8598 tree sname = declarator->u.id.unqualified_name;
8600 if (current_class_type
8601 && (!friendp || funcdef_flag))
8604 ? "cannot define member function %<%T::%s%> within %<%T%>"
8605 : "cannot declare member function %<%T::%s%> within %<%T%>",
8606 ctype, name, current_class_type);
8607 return error_mark_node;
8610 if (TREE_CODE (sname) == IDENTIFIER_NODE
8611 && NEW_DELETE_OPNAME_P (sname))
8612 /* Overloaded operator new and operator delete
8613 are always static functions. */
8616 type = build_memfn_type (type, ctype, memfn_quals);
8618 else if (declspecs->specs[(int)ds_typedef]
8619 && current_class_type)
8621 error ("cannot declare member %<%T::%s%> within %qT",
8622 ctype, name, current_class_type);
8623 return error_mark_node;
8627 /* Now TYPE has the actual type. */
8632 *attrlist = chainon (returned_attrs, *attrlist);
8634 attrlist = &returned_attrs;
8637 /* Handle parameter packs. */
8638 if (parameter_pack_p)
8640 if (decl_context == PARM)
8641 /* Turn the type into a pack expansion.*/
8642 type = make_pack_expansion (type);
8644 error ("non-parameter %qs cannot be a parameter pack", name);
8647 /* Did array size calculations overflow? */
8649 if (TREE_CODE (type) == ARRAY_TYPE
8650 && COMPLETE_TYPE_P (type)
8651 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8652 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8654 error ("size of array %qs is too large", name);
8655 /* If we proceed with the array type as it is, we'll eventually
8656 crash in tree_low_cst(). */
8657 type = error_mark_node;
8660 if ((decl_context == FIELD || decl_context == PARM)
8661 && !processing_template_decl
8662 && variably_modified_type_p (type, NULL_TREE))
8664 if (decl_context == FIELD)
8665 error ("data member may not have variably modified type %qT", type);
8667 error ("parameter may not have variably modified type %qT", type);
8668 type = error_mark_node;
8671 if (explicitp == 1 || (explicitp && friendp))
8673 /* [dcl.fct.spec] The explicit specifier shall only be used in
8674 declarations of constructors within a class definition. */
8675 error ("only declarations of constructors can be %<explicit%>");
8679 if (storage_class == sc_mutable)
8681 if (decl_context != FIELD || friendp)
8683 error ("non-member %qs cannot be declared %<mutable%>", name);
8684 storage_class = sc_none;
8686 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8688 error ("non-object member %qs cannot be declared %<mutable%>", name);
8689 storage_class = sc_none;
8691 else if (TREE_CODE (type) == FUNCTION_TYPE
8692 || TREE_CODE (type) == METHOD_TYPE)
8694 error ("function %qs cannot be declared %<mutable%>", name);
8695 storage_class = sc_none;
8699 error ("static %qs cannot be declared %<mutable%>", name);
8700 storage_class = sc_none;
8702 else if (type_quals & TYPE_QUAL_CONST)
8704 error ("const %qs cannot be declared %<mutable%>", name);
8705 storage_class = sc_none;
8709 /* If this is declaring a typedef name, return a TYPE_DECL. */
8710 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8714 /* Note that the grammar rejects storage classes
8715 in typenames, fields or parameters. */
8716 if (current_lang_name == lang_name_java)
8717 TYPE_FOR_JAVA (type) = 1;
8719 /* This declaration:
8721 typedef void f(int) const;
8723 declares a function type which is not a member of any
8724 particular class, but which is cv-qualified; for
8725 example "f S::*" declares a pointer to a const-qualified
8726 member function of S. We record the cv-qualification in the
8728 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8730 type = cp_build_qualified_type (type, memfn_quals);
8732 /* We have now dealt with these qualifiers. */
8733 memfn_quals = TYPE_UNQUALIFIED;
8736 if (decl_context == FIELD)
8737 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8739 decl = build_decl (TYPE_DECL, unqualified_id, type);
8740 if (id_declarator && declarator->u.id.qualifying_scope) {
8741 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8742 TREE_TYPE (decl) = error_mark_node;
8745 if (decl_context != FIELD)
8747 if (!current_function_decl)
8748 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8749 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8750 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8751 (current_function_decl)))
8752 /* The TYPE_DECL is "abstract" because there will be
8753 clones of this constructor/destructor, and there will
8754 be copies of this TYPE_DECL generated in those
8756 DECL_ABSTRACT (decl) = 1;
8758 else if (constructor_name_p (unqualified_id, current_class_type))
8759 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8760 "as enclosing class",
8763 /* If the user declares "typedef struct {...} foo" then the
8764 struct will have an anonymous name. Fill that name in now.
8765 Nothing can refer to it, so nothing needs know about the name
8767 if (type != error_mark_node
8770 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8771 && TYPE_ANONYMOUS_P (type)
8772 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8774 tree oldname = TYPE_NAME (type);
8777 /* Replace the anonymous name with the real name everywhere. */
8778 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8779 if (TYPE_NAME (t) == oldname)
8780 TYPE_NAME (t) = decl;
8782 if (TYPE_LANG_SPECIFIC (type))
8783 TYPE_WAS_ANONYMOUS (type) = 1;
8785 /* If this is a typedef within a template class, the nested
8786 type is a (non-primary) template. The name for the
8787 template needs updating as well. */
8788 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8789 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8790 = TYPE_IDENTIFIER (type);
8792 /* FIXME remangle member functions; member functions of a
8793 type with external linkage have external linkage. */
8797 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8798 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8800 bad_specifiers (decl, "type", virtualp,
8801 memfn_quals != TYPE_UNQUALIFIED,
8802 inlinep, friendp, raises != NULL_TREE);
8807 /* Detect the case of an array type of unspecified size
8808 which came, as such, direct from a typedef name.
8809 We must copy the type, so that the array's domain can be
8810 individually set by the object's initializer. */
8812 if (type && typedef_type
8813 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8814 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8815 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8817 /* Detect where we're using a typedef of function type to declare a
8818 function. PARMS will not be set, so we must create it now. */
8820 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8822 tree decls = NULL_TREE;
8825 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8827 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8829 TREE_CHAIN (decl) = decls;
8833 parms = nreverse (decls);
8835 if (decl_context != TYPENAME)
8837 /* A cv-qualifier-seq shall only be part of the function type
8838 for a non-static member function. [8.3.5/4 dcl.fct] */
8839 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8840 && (current_class_type == NULL_TREE || staticp) )
8843 ? G_("qualified function types cannot be used to "
8844 "declare static member functions")
8845 : G_("qualified function types cannot be used to "
8846 "declare free functions"));
8847 type = TYPE_MAIN_VARIANT (type);
8850 /* The qualifiers on the function type become the qualifiers on
8851 the non-static member function. */
8852 memfn_quals |= cp_type_quals (type);
8856 /* If this is a type name (such as, in a cast or sizeof),
8857 compute the type and return it now. */
8859 if (decl_context == TYPENAME)
8861 /* Note that the grammar rejects storage classes
8862 in typenames, fields or parameters. */
8863 if (type_quals != TYPE_UNQUALIFIED)
8864 type_quals = TYPE_UNQUALIFIED;
8866 /* Special case: "friend class foo" looks like a TYPENAME context. */
8869 if (type_quals != TYPE_UNQUALIFIED)
8871 error ("type qualifiers specified for friend class declaration");
8872 type_quals = TYPE_UNQUALIFIED;
8876 error ("%<inline%> specified for friend class declaration");
8882 /* Don't allow friend declaration without a class-key. */
8883 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8884 permerror (input_location, "template parameters cannot be friends");
8885 else if (TREE_CODE (type) == TYPENAME_TYPE)
8886 permerror (input_location, "friend declaration requires class-key, "
8887 "i.e. %<friend class %T::%D%>",
8888 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8890 permerror (input_location, "friend declaration requires class-key, "
8891 "i.e. %<friend %#T%>",
8895 /* Only try to do this stuff if we didn't already give up. */
8896 if (type != integer_type_node)
8898 /* A friendly class? */
8899 if (current_class_type)
8900 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8903 error ("trying to make class %qT a friend of global scope",
8906 type = void_type_node;
8909 else if (memfn_quals)
8911 if (ctype == NULL_TREE)
8913 if (TREE_CODE (type) != METHOD_TYPE)
8914 error ("invalid qualifiers on non-member function type");
8916 ctype = TYPE_METHOD_BASETYPE (type);
8919 type = build_memfn_type (type, ctype, memfn_quals);
8924 else if (unqualified_id == NULL_TREE && decl_context != PARM
8925 && decl_context != CATCHPARM
8926 && TREE_CODE (type) != UNION_TYPE
8929 error ("abstract declarator %qT used as declaration", type);
8930 return error_mark_node;
8933 /* Only functions may be declared using an operator-function-id. */
8935 && IDENTIFIER_OPNAME_P (unqualified_id)
8936 && TREE_CODE (type) != FUNCTION_TYPE
8937 && TREE_CODE (type) != METHOD_TYPE)
8939 error ("declaration of %qD as non-function", unqualified_id);
8940 return error_mark_node;
8943 /* We don't check parameter types here because we can emit a better
8944 error message later. */
8945 if (decl_context != PARM)
8947 type = check_var_type (unqualified_id, type);
8948 if (type == error_mark_node)
8949 return error_mark_node;
8952 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8953 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8955 if (decl_context == PARM || decl_context == CATCHPARM)
8957 if (ctype || in_namespace)
8958 error ("cannot use %<::%> in parameter declaration");
8960 /* A parameter declared as an array of T is really a pointer to T.
8961 One declared as a function is really a pointer to a function.
8962 One declared as a member is really a pointer to member. */
8964 if (TREE_CODE (type) == ARRAY_TYPE)
8966 /* Transfer const-ness of array into that of type pointed to. */
8967 type = build_pointer_type (TREE_TYPE (type));
8968 type_quals = TYPE_UNQUALIFIED;
8970 else if (TREE_CODE (type) == FUNCTION_TYPE)
8971 type = build_pointer_type (type);
8977 if (decl_context == PARM)
8979 decl = cp_build_parm_decl (unqualified_id, type);
8981 bad_specifiers (decl, "parameter", virtualp,
8982 memfn_quals != TYPE_UNQUALIFIED,
8983 inlinep, friendp, raises != NULL_TREE);
8985 else if (decl_context == FIELD)
8987 /* The C99 flexible array extension. */
8988 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8989 && TYPE_DOMAIN (type) == NULL_TREE)
8991 tree itype = compute_array_index_type (dname, integer_zero_node);
8992 type = build_cplus_array_type (TREE_TYPE (type), itype);
8995 if (type == error_mark_node)
8997 /* Happens when declaring arrays of sizes which
8998 are error_mark_node, for example. */
9001 else if (in_namespace && !friendp)
9003 /* Something like struct S { int N::j; }; */
9004 error ("invalid use of %<::%>");
9005 return error_mark_node;
9007 else if (TREE_CODE (type) == FUNCTION_TYPE)
9010 tree function_context;
9014 if (ctype == NULL_TREE)
9015 ctype = current_class_type;
9017 if (ctype == NULL_TREE)
9019 error ("can't make %qD into a method -- not in a class",
9021 return error_mark_node;
9024 /* ``A union may [ ... ] not [ have ] virtual functions.''
9026 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9028 error ("function %qD declared virtual inside a union",
9030 return error_mark_node;
9033 if (NEW_DELETE_OPNAME_P (unqualified_id))
9037 error ("%qD cannot be declared virtual, since it "
9043 else if (staticp < 2)
9044 type = build_memfn_type (type, ctype, memfn_quals);
9047 /* Check that the name used for a destructor makes sense. */
9048 if (sfk == sfk_destructor)
9050 tree uqname = id_declarator->u.id.unqualified_name;
9054 gcc_assert (friendp);
9055 error ("expected qualified name in friend declaration "
9056 "for destructor %qD", uqname);
9057 return error_mark_node;
9060 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9062 error ("declaration of %qD as member of %qT",
9064 return error_mark_node;
9067 else if (sfk == sfk_constructor && friendp)
9069 error ("expected qualified name in friend declaration "
9070 "for constructor %qD",
9071 id_declarator->u.id.unqualified_name);
9072 return error_mark_node;
9075 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9076 function_context = (ctype != NULL_TREE) ?
9077 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9078 publicp = (! friendp || ! staticp)
9079 && function_context == NULL_TREE;
9080 decl = grokfndecl (ctype, type,
9081 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9082 ? unqualified_id : dname,
9085 virtualp, flags, memfn_quals, raises,
9086 friendp ? -1 : 0, friendp, publicp, inlinep,
9088 funcdef_flag, template_count, in_namespace,
9089 attrlist, declarator->id_loc);
9090 if (decl == NULL_TREE)
9091 return error_mark_node;
9093 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9094 /* The decl and setting of decl_attr is also turned off. */
9095 decl = build_decl_attribute_variant (decl, decl_attr);
9098 /* [class.conv.ctor]
9100 A constructor declared without the function-specifier
9101 explicit that can be called with a single parameter
9102 specifies a conversion from the type of its first
9103 parameter to the type of its class. Such a constructor
9104 is called a converting constructor. */
9106 DECL_NONCONVERTING_P (decl) = 1;
9108 else if (TREE_CODE (type) == METHOD_TYPE)
9110 /* We only get here for friend declarations of
9111 members of other classes. */
9112 /* All method decls are public, so tell grokfndecl to set
9113 TREE_PUBLIC, also. */
9114 decl = grokfndecl (ctype, type,
9115 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9116 ? unqualified_id : dname,
9119 virtualp, flags, memfn_quals, raises,
9120 friendp ? -1 : 0, friendp, 1, 0, sfk,
9121 funcdef_flag, template_count, in_namespace,
9123 declarator->id_loc);
9124 if (decl == NULL_TREE)
9125 return error_mark_node;
9127 else if (!staticp && !dependent_type_p (type)
9128 && !COMPLETE_TYPE_P (complete_type (type))
9129 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9132 error ("field %qD has incomplete type", unqualified_id);
9134 error ("name %qT has incomplete type", type);
9136 /* If we're instantiating a template, tell them which
9137 instantiation made the field's type be incomplete. */
9138 if (current_class_type
9139 && TYPE_NAME (current_class_type)
9140 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9142 && declspecs->type == type)
9143 error (" in instantiation of template %qT",
9144 current_class_type);
9146 return error_mark_node;
9152 error ("%qE is neither function nor member function; "
9153 "cannot be declared friend", unqualified_id);
9161 /* Friends are treated specially. */
9162 if (ctype == current_class_type)
9163 ; /* We already issued a permerror. */
9164 else if (decl && DECL_NAME (decl))
9166 if (template_class_depth (current_class_type) == 0)
9168 decl = check_explicit_specialization
9169 (unqualified_id, decl, template_count,
9170 2 * funcdef_flag + 4);
9171 if (decl == error_mark_node)
9172 return error_mark_node;
9175 decl = do_friend (ctype, unqualified_id, decl,
9181 return error_mark_node;
9184 /* Structure field. It may not be a function, except for C++. */
9186 if (decl == NULL_TREE)
9192 /* An attempt is being made to initialize a non-static
9193 member. But, from [class.mem]:
9195 4 A member-declarator can contain a
9196 constant-initializer only if it declares a static
9197 member (_class.static_) of integral or enumeration
9198 type, see _class.static.data_.
9200 This used to be relatively common practice, but
9201 the rest of the compiler does not correctly
9202 handle the initialization unless the member is
9203 static so we make it static below. */
9204 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9206 permerror (input_location, "making %qD static", unqualified_id);
9210 if (uses_template_parms (type))
9211 /* We'll check at instantiation time. */
9213 else if (check_static_variable_definition (unqualified_id,
9215 /* If we just return the declaration, crashes
9216 will sometimes occur. We therefore return
9217 void_type_node, as if this was a friend
9218 declaration, to cause callers to completely
9219 ignore this declaration. */
9220 return error_mark_node;
9225 /* C++ allows static class members. All other work
9226 for this is done by grokfield. */
9227 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9228 set_linkage_for_static_data_member (decl);
9229 /* Even if there is an in-class initialization, DECL
9230 is considered undefined until an out-of-class
9231 definition is provided. */
9232 DECL_EXTERNAL (decl) = 1;
9235 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9239 decl = build_decl (FIELD_DECL, unqualified_id, type);
9240 DECL_NONADDRESSABLE_P (decl) = bitfield;
9241 if (bitfield && !unqualified_id)
9242 TREE_NO_WARNING (decl) = 1;
9244 if (storage_class == sc_mutable)
9246 DECL_MUTABLE_P (decl) = 1;
9247 storage_class = sc_none;
9251 bad_specifiers (decl, "field", virtualp,
9252 memfn_quals != TYPE_UNQUALIFIED,
9253 inlinep, friendp, raises != NULL_TREE);
9256 else if (TREE_CODE (type) == FUNCTION_TYPE
9257 || TREE_CODE (type) == METHOD_TYPE)
9262 if (!unqualified_id)
9263 return error_mark_node;
9265 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9266 original_name = dname;
9268 original_name = unqualified_id;
9270 if (storage_class == sc_auto)
9271 error ("storage class %<auto%> invalid for function %qs", name);
9272 else if (storage_class == sc_register)
9273 error ("storage class %<register%> invalid for function %qs", name);
9275 error ("storage class %<__thread%> invalid for function %qs", name);
9277 /* Function declaration not at top level.
9278 Storage classes other than `extern' are not allowed
9279 and `extern' makes no difference. */
9280 if (! toplevel_bindings_p ()
9281 && (storage_class == sc_static
9282 || declspecs->specs[(int)ds_inline])
9285 if (storage_class == sc_static)
9286 pedwarn (input_location, OPT_pedantic,
9287 "%<static%> specified invalid for function %qs "
9288 "declared out of global scope", name);
9290 pedwarn (input_location, OPT_pedantic,
9291 "%<inline%> specifier invalid for function %qs "
9292 "declared out of global scope", name);
9295 if (ctype != NULL_TREE
9296 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9298 error ("%q#T is not a class or a namespace", ctype);
9302 if (ctype == NULL_TREE)
9306 error ("virtual non-class function %qs", name);
9310 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9311 && !NEW_DELETE_OPNAME_P (original_name))
9312 type = build_method_type_directly (ctype,
9314 TYPE_ARG_TYPES (type));
9316 /* Record presence of `static'. */
9317 publicp = (ctype != NULL_TREE
9318 || storage_class == sc_extern
9319 || storage_class != sc_static);
9321 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9322 virtualp, flags, memfn_quals, raises,
9324 publicp, inlinep, sfk, funcdef_flag,
9325 template_count, in_namespace, attrlist,
9326 declarator->id_loc);
9327 if (decl == NULL_TREE)
9328 return error_mark_node;
9332 int invalid_static = 0;
9334 /* Don't allow a static member function in a class, and forbid
9335 declaring main to be static. */
9336 if (TREE_CODE (type) == METHOD_TYPE)
9338 permerror (input_location, "cannot declare member function %qD to have "
9339 "static linkage", decl);
9342 else if (current_function_decl)
9344 /* FIXME need arm citation */
9345 error ("cannot declare static function inside another function");
9352 storage_class = sc_none;
9358 /* It's a variable. */
9360 /* An uninitialized decl with `extern' is a reference. */
9361 decl = grokvardecl (type, unqualified_id,
9364 (type_quals & TYPE_QUAL_CONST) != 0,
9365 ctype ? ctype : in_namespace);
9366 bad_specifiers (decl, "variable", virtualp,
9367 memfn_quals != TYPE_UNQUALIFIED,
9368 inlinep, friendp, raises != NULL_TREE);
9372 DECL_CONTEXT (decl) = ctype;
9375 permerror (input_location, "%<static%> may not be used when defining "
9376 "(as opposed to declaring) a static data member");
9378 storage_class = sc_none;
9380 if (storage_class == sc_register && TREE_STATIC (decl))
9382 error ("static member %qD declared %<register%>", decl);
9383 storage_class = sc_none;
9385 if (storage_class == sc_extern && pedantic)
9387 pedwarn (input_location, OPT_pedantic,
9388 "cannot explicitly declare member %q#D to have "
9389 "extern linkage", decl);
9390 storage_class = sc_none;
9395 if (storage_class == sc_extern && initialized && !funcdef_flag)
9397 if (toplevel_bindings_p ())
9399 /* It's common practice (and completely valid) to have a const
9400 be initialized and declared extern. */
9401 if (!(type_quals & TYPE_QUAL_CONST))
9402 warning (0, "%qs initialized and declared %<extern%>", name);
9406 error ("%qs has both %<extern%> and initializer", name);
9407 return error_mark_node;
9411 /* Record `register' declaration for warnings on &
9412 and in case doing stupid register allocation. */
9414 if (storage_class == sc_register)
9415 DECL_REGISTER (decl) = 1;
9416 else if (storage_class == sc_extern)
9417 DECL_THIS_EXTERN (decl) = 1;
9418 else if (storage_class == sc_static)
9419 DECL_THIS_STATIC (decl) = 1;
9421 /* Record constancy and volatility on the DECL itself . There's
9422 no need to do this when processing a template; we'll do this
9423 for the instantiated declaration based on the type of DECL. */
9424 if (!processing_template_decl)
9425 cp_apply_type_quals_to_decl (type_quals, decl);
9428 TREE_NO_WARNING (decl) = 1;
9434 /* Subroutine of start_function. Ensure that each of the parameter
9435 types (as listed in PARMS) is complete, as is required for a
9436 function definition. */
9439 require_complete_types_for_parms (tree parms)
9441 for (; parms; parms = TREE_CHAIN (parms))
9443 if (dependent_type_p (TREE_TYPE (parms)))
9445 if (!VOID_TYPE_P (TREE_TYPE (parms))
9446 && complete_type_or_else (TREE_TYPE (parms), parms))
9448 relayout_decl (parms);
9449 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9452 /* grokparms or complete_type_or_else will have already issued
9454 TREE_TYPE (parms) = error_mark_node;
9458 /* Returns nonzero if T is a local variable. */
9461 local_variable_p (const_tree t)
9463 if ((TREE_CODE (t) == VAR_DECL
9464 /* A VAR_DECL with a context that is a _TYPE is a static data
9466 && !TYPE_P (CP_DECL_CONTEXT (t))
9467 /* Any other non-local variable must be at namespace scope. */
9468 && !DECL_NAMESPACE_SCOPE_P (t))
9469 || (TREE_CODE (t) == PARM_DECL))
9475 /* Like local_variable_p, but suitable for use as a tree-walking
9479 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9480 void *data ATTRIBUTE_UNUSED)
9482 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9484 else if (TYPE_P (*tp))
9491 /* Check that ARG, which is a default-argument expression for a
9492 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9493 something goes wrong. DECL may also be a _TYPE node, rather than a
9494 DECL, if there is no DECL available. */
9497 check_default_argument (tree decl, tree arg)
9502 if (TREE_CODE (arg) == DEFAULT_ARG)
9503 /* We get a DEFAULT_ARG when looking at an in-class declaration
9504 with a default argument. Ignore the argument for now; we'll
9505 deal with it after the class is complete. */
9514 decl_type = TREE_TYPE (decl);
9516 if (arg == error_mark_node
9517 || decl == error_mark_node
9518 || TREE_TYPE (arg) == error_mark_node
9519 || decl_type == error_mark_node)
9520 /* Something already went wrong. There's no need to check
9522 return error_mark_node;
9524 /* [dcl.fct.default]
9526 A default argument expression is implicitly converted to the
9528 if (!TREE_TYPE (arg)
9529 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9532 error ("default argument for %q#D has type %qT",
9533 decl, TREE_TYPE (arg));
9535 error ("default argument for parameter of type %qT has type %qT",
9536 decl_type, TREE_TYPE (arg));
9538 return error_mark_node;
9541 /* [dcl.fct.default]
9543 Local variables shall not be used in default argument
9546 The keyword `this' shall not be used in a default argument of a
9548 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9551 error ("default argument %qE uses local variable %qD", arg, var);
9552 return error_mark_node;
9559 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9562 type_is_deprecated (tree type)
9564 enum tree_code code;
9565 if (TREE_DEPRECATED (type))
9567 if (TYPE_NAME (type)
9568 && TREE_DEPRECATED (TYPE_NAME (type)))
9571 code = TREE_CODE (type);
9573 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9574 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9575 || code == METHOD_TYPE || code == ARRAY_TYPE)
9576 return type_is_deprecated (TREE_TYPE (type));
9578 if (TYPE_PTRMEMFUNC_P (type))
9579 return type_is_deprecated
9580 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9585 /* Decode the list of parameter types for a function type.
9586 Given the list of things declared inside the parens,
9587 return a list of types.
9589 If this parameter does not end with an ellipsis, we append
9592 *PARMS is set to the chain of PARM_DECLs created. */
9595 grokparms (tree parmlist, tree *parms)
9597 tree result = NULL_TREE;
9598 tree decls = NULL_TREE;
9602 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9604 tree type = NULL_TREE;
9605 tree init = TREE_PURPOSE (parm);
9606 tree decl = TREE_VALUE (parm);
9608 if (parm == void_list_node)
9611 if (! decl || TREE_TYPE (decl) == error_mark_node)
9614 type = TREE_TYPE (decl);
9615 if (VOID_TYPE_P (type))
9617 if (same_type_p (type, void_type_node)
9618 && DECL_SELF_REFERENCE_P (type)
9619 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9620 /* this is a parmlist of `(void)', which is ok. */
9622 cxx_incomplete_type_error (decl, type);
9623 /* It's not a good idea to actually create parameters of
9624 type `void'; other parts of the compiler assume that a
9625 void type terminates the parameter list. */
9626 type = error_mark_node;
9627 TREE_TYPE (decl) = error_mark_node;
9630 if (type != error_mark_node
9631 && TYPE_FOR_JAVA (type)
9632 && MAYBE_CLASS_TYPE_P (type))
9634 error ("parameter %qD has Java class type", decl);
9635 type = error_mark_node;
9636 TREE_TYPE (decl) = error_mark_node;
9640 if (type != error_mark_node)
9642 if (deprecated_state != DEPRECATED_SUPPRESS)
9644 tree deptype = type_is_deprecated (type);
9646 warn_deprecated_use (deptype);
9649 /* Top-level qualifiers on the parameters are
9650 ignored for function types. */
9651 type = cp_build_qualified_type (type, 0);
9652 if (TREE_CODE (type) == METHOD_TYPE)
9654 error ("parameter %qD invalidly declared method type", decl);
9655 type = build_pointer_type (type);
9656 TREE_TYPE (decl) = type;
9658 else if (abstract_virtuals_error (decl, type))
9659 any_error = 1; /* Seems like a good idea. */
9660 else if (POINTER_TYPE_P (type))
9662 /* [dcl.fct]/6, parameter types cannot contain pointers
9663 (references) to arrays of unknown bound. */
9664 tree t = TREE_TYPE (type);
9665 int ptr = TYPE_PTR_P (type);
9671 else if (TREE_CODE (t) != ARRAY_TYPE)
9673 else if (!TYPE_DOMAIN (t))
9677 if (TREE_CODE (t) == ARRAY_TYPE)
9678 error ("parameter %qD includes %s to array of unknown "
9680 decl, ptr ? "pointer" : "reference", t);
9685 else if (init && !processing_template_decl)
9686 init = check_default_argument (decl, init);
9689 if (TREE_CODE (decl) == PARM_DECL
9690 && FUNCTION_PARAMETER_PACK_P (decl)
9691 && TREE_CHAIN (parm)
9692 && TREE_CHAIN (parm) != void_list_node)
9693 error ("parameter packs must be at the end of the parameter list");
9695 TREE_CHAIN (decl) = decls;
9697 result = tree_cons (init, type, result);
9699 decls = nreverse (decls);
9700 result = nreverse (result);
9702 result = chainon (result, void_list_node);
9709 /* D is a constructor or overloaded `operator='.
9711 Let T be the class in which D is declared. Then, this function
9714 -1 if D's is an ill-formed constructor or copy assignment operator
9715 whose first parameter is of type `T'.
9716 0 if D is not a copy constructor or copy assignment
9718 1 if D is a copy constructor or copy assignment operator whose
9719 first parameter is a reference to const qualified T.
9720 2 if D is a copy constructor or copy assignment operator whose
9721 first parameter is a reference to non-const qualified T.
9723 This function can be used as a predicate. Positive values indicate
9724 a copy constructor and nonzero values indicate a copy assignment
9728 copy_fn_p (const_tree d)
9734 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9736 if (TREE_CODE (d) == TEMPLATE_DECL
9737 || (DECL_TEMPLATE_INFO (d)
9738 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9739 /* Instantiations of template member functions are never copy
9740 functions. Note that member functions of templated classes are
9741 represented as template functions internally, and we must
9742 accept those as copy functions. */
9745 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9749 arg_type = TREE_VALUE (args);
9750 if (arg_type == error_mark_node)
9753 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9755 /* Pass by value copy assignment operator. */
9758 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9759 && !TYPE_REF_IS_RVALUE (arg_type)
9760 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9762 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9768 args = TREE_CHAIN (args);
9770 if (args && args != void_list_node && !TREE_PURPOSE (args))
9771 /* There are more non-optional args. */
9777 /* D is a constructor or overloaded `operator='.
9779 Let T be the class in which D is declared. Then, this function
9780 returns true when D is a move constructor or move assignment
9781 operator, false otherwise. */
9784 move_fn_p (const_tree d)
9788 bool result = false;
9790 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9792 if (cxx_dialect == cxx98)
9793 /* There are no move constructors if we are in C++98 mode. */
9796 if (TREE_CODE (d) == TEMPLATE_DECL
9797 || (DECL_TEMPLATE_INFO (d)
9798 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9799 /* Instantiations of template member functions are never copy
9800 functions. Note that member functions of templated classes are
9801 represented as template functions internally, and we must
9802 accept those as copy functions. */
9805 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9809 arg_type = TREE_VALUE (args);
9810 if (arg_type == error_mark_node)
9813 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9814 && TYPE_REF_IS_RVALUE (arg_type)
9815 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9819 args = TREE_CHAIN (args);
9821 if (args && args != void_list_node && !TREE_PURPOSE (args))
9822 /* There are more non-optional args. */
9828 /* Remember any special properties of member function DECL. */
9831 grok_special_member_properties (tree decl)
9835 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9838 class_type = DECL_CONTEXT (decl);
9839 if (DECL_CONSTRUCTOR_P (decl))
9841 int ctor = copy_fn_p (decl);
9843 if (!DECL_ARTIFICIAL (decl))
9844 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9850 A non-template constructor for class X is a copy
9851 constructor if its first parameter is of type X&, const
9852 X&, volatile X& or const volatile X&, and either there
9853 are no other parameters or else all other parameters have
9854 default arguments. */
9855 TYPE_HAS_INIT_REF (class_type) = 1;
9856 if (!DECL_DEFAULTED_FN (decl))
9857 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9859 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9861 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9863 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9864 if (TREE_CODE (decl) == TEMPLATE_DECL || !DECL_DEFAULTED_FN (decl))
9865 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
9867 else if (is_list_ctor (decl))
9868 TYPE_HAS_LIST_CTOR (class_type) = 1;
9870 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9874 A non-template assignment operator for class X is a copy
9875 assignment operator if its parameter is of type X, X&, const
9876 X&, volatile X& or const volatile X&. */
9878 int assop = copy_fn_p (decl);
9882 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9883 if (!DECL_DEFAULTED_FN (decl))
9884 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9886 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9891 /* Check a constructor DECL has the correct form. Complains
9892 if the class has a constructor of the form X(X). */
9895 grok_ctor_properties (const_tree ctype, const_tree decl)
9897 int ctor_parm = copy_fn_p (decl);
9903 A declaration of a constructor for a class X is ill-formed if
9904 its first parameter is of type (optionally cv-qualified) X
9905 and either there are no other parameters or else all other
9906 parameters have default arguments.
9908 We *don't* complain about member template instantiations that
9909 have this form, though; they can occur as we try to decide
9910 what constructor to use during overload resolution. Since
9911 overload resolution will never prefer such a constructor to
9912 the non-template copy constructor (which is either explicitly
9913 or implicitly defined), there's no need to worry about their
9914 existence. Theoretically, they should never even be
9915 instantiated, but that's hard to forestall. */
9916 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9924 /* An operator with this code is unary, but can also be binary. */
9927 ambi_op_p (enum tree_code code)
9929 return (code == INDIRECT_REF
9930 || code == ADDR_EXPR
9931 || code == UNARY_PLUS_EXPR
9932 || code == NEGATE_EXPR
9933 || code == PREINCREMENT_EXPR
9934 || code == PREDECREMENT_EXPR);
9937 /* An operator with this name can only be unary. */
9940 unary_op_p (enum tree_code code)
9942 return (code == TRUTH_NOT_EXPR
9943 || code == BIT_NOT_EXPR
9944 || code == COMPONENT_REF
9945 || code == TYPE_EXPR);
9948 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9949 errors are issued for invalid declarations. */
9952 grok_op_properties (tree decl, bool complain)
9954 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9956 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9957 tree name = DECL_NAME (decl);
9958 enum tree_code operator_code;
9963 /* Count the number of arguments and check for ellipsis. */
9964 for (argtype = argtypes, arity = 0;
9965 argtype && argtype != void_list_node;
9966 argtype = TREE_CHAIN (argtype))
9968 ellipsis_p = !argtype;
9970 class_type = DECL_CONTEXT (decl);
9971 if (class_type && !CLASS_TYPE_P (class_type))
9972 class_type = NULL_TREE;
9974 if (DECL_CONV_FN_P (decl))
9975 operator_code = TYPE_EXPR;
9979 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9980 if (ansi_opname (CODE) == name) \
9982 operator_code = (CODE); \
9985 else if (ansi_assopname (CODE) == name) \
9987 operator_code = (CODE); \
9988 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9992 #include "operators.def"
9998 gcc_assert (operator_code != MAX_TREE_CODES);
9999 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10002 switch (operator_code)
10005 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10009 TYPE_GETS_DELETE (class_type) |= 1;
10013 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10016 case VEC_DELETE_EXPR:
10017 TYPE_GETS_DELETE (class_type) |= 2;
10024 /* [basic.std.dynamic.allocation]/1:
10026 A program is ill-formed if an allocation function is declared
10027 in a namespace scope other than global scope or declared static
10030 The same also holds true for deallocation functions. */
10031 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10032 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10034 if (DECL_NAMESPACE_SCOPE_P (decl))
10036 if (CP_DECL_CONTEXT (decl) != global_namespace)
10038 error ("%qD may not be declared within a namespace", decl);
10041 else if (!TREE_PUBLIC (decl))
10043 error ("%qD may not be declared as static", decl);
10049 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10051 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10052 DECL_IS_OPERATOR_NEW (decl) = 1;
10054 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10055 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10058 /* An operator function must either be a non-static member function
10059 or have at least one parameter of a class, a reference to a class,
10060 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10061 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10063 if (operator_code == TYPE_EXPR
10064 || operator_code == CALL_EXPR
10065 || operator_code == COMPONENT_REF
10066 || operator_code == ARRAY_REF
10067 || operator_code == NOP_EXPR)
10069 error ("%qD must be a nonstatic member function", decl);
10076 if (DECL_STATIC_FUNCTION_P (decl))
10078 error ("%qD must be either a non-static member "
10079 "function or a non-member function", decl);
10083 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10085 tree arg = non_reference (TREE_VALUE (p));
10086 if (arg == error_mark_node)
10089 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10090 because these checks are performed even on
10091 template functions. */
10092 if (MAYBE_CLASS_TYPE_P (arg)
10093 || TREE_CODE (arg) == ENUMERAL_TYPE)
10097 if (!p || p == void_list_node)
10100 error ("%qD must have an argument of class or "
10101 "enumerated type", decl);
10107 /* There are no restrictions on the arguments to an overloaded
10109 if (operator_code == CALL_EXPR)
10112 /* Warn about conversion operators that will never be used. */
10113 if (IDENTIFIER_TYPENAME_P (name)
10114 && ! DECL_TEMPLATE_INFO (decl)
10116 /* Warn only declaring the function; there is no need to
10117 warn again about out-of-class definitions. */
10118 && class_type == current_class_type)
10120 tree t = TREE_TYPE (name);
10121 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10122 const char *what = 0;
10125 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10127 if (TREE_CODE (t) == VOID_TYPE)
10129 else if (class_type)
10131 if (t == class_type)
10132 what = "the same type";
10133 /* Don't force t to be complete here. */
10134 else if (MAYBE_CLASS_TYPE_P (t)
10135 && COMPLETE_TYPE_P (t)
10136 && DERIVED_FROM_P (t, class_type))
10137 what = "a base class";
10141 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10142 "conversion operator",
10143 ref ? "a reference to " : "", what);
10146 if (operator_code == COND_EXPR)
10149 error ("ISO C++ prohibits overloading operator ?:");
10152 else if (ellipsis_p)
10154 error ("%qD must not have variable number of arguments", decl);
10157 else if (ambi_op_p (operator_code))
10160 /* We pick the one-argument operator codes by default, so
10161 we don't have to change anything. */
10163 else if (arity == 2)
10165 /* If we thought this was a unary operator, we now know
10166 it to be a binary operator. */
10167 switch (operator_code)
10170 operator_code = MULT_EXPR;
10174 operator_code = BIT_AND_EXPR;
10177 case UNARY_PLUS_EXPR:
10178 operator_code = PLUS_EXPR;
10182 operator_code = MINUS_EXPR;
10185 case PREINCREMENT_EXPR:
10186 operator_code = POSTINCREMENT_EXPR;
10189 case PREDECREMENT_EXPR:
10190 operator_code = POSTDECREMENT_EXPR;
10194 gcc_unreachable ();
10197 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10199 if ((operator_code == POSTINCREMENT_EXPR
10200 || operator_code == POSTDECREMENT_EXPR)
10201 && ! processing_template_decl
10202 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10205 error ("postfix %qD must take %<int%> as its argument",
10208 error ("postfix %qD must take %<int%> as its second "
10216 error ("%qD must take either zero or one argument", decl);
10218 error ("%qD must take either one or two arguments", decl);
10222 /* More Effective C++ rule 6. */
10224 && (operator_code == POSTINCREMENT_EXPR
10225 || operator_code == POSTDECREMENT_EXPR
10226 || operator_code == PREINCREMENT_EXPR
10227 || operator_code == PREDECREMENT_EXPR))
10229 tree arg = TREE_VALUE (argtypes);
10230 tree ret = TREE_TYPE (TREE_TYPE (decl));
10231 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10232 arg = TREE_TYPE (arg);
10233 arg = TYPE_MAIN_VARIANT (arg);
10234 if (operator_code == PREINCREMENT_EXPR
10235 || operator_code == PREDECREMENT_EXPR)
10237 if (TREE_CODE (ret) != REFERENCE_TYPE
10238 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10240 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10241 build_reference_type (arg));
10245 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10246 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10250 else if (unary_op_p (operator_code))
10255 error ("%qD must take %<void%>", decl);
10257 error ("%qD must take exactly one argument", decl);
10261 else /* if (binary_op_p (operator_code)) */
10266 error ("%qD must take exactly one argument", decl);
10268 error ("%qD must take exactly two arguments", decl);
10272 /* More Effective C++ rule 7. */
10274 && (operator_code == TRUTH_ANDIF_EXPR
10275 || operator_code == TRUTH_ORIF_EXPR
10276 || operator_code == COMPOUND_EXPR))
10277 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10281 /* Effective C++ rule 23. */
10284 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10285 && (operator_code == PLUS_EXPR
10286 || operator_code == MINUS_EXPR
10287 || operator_code == TRUNC_DIV_EXPR
10288 || operator_code == MULT_EXPR
10289 || operator_code == TRUNC_MOD_EXPR)
10290 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10291 warning (OPT_Weffc__, "%qD should return by value", decl);
10293 /* [over.oper]/8 */
10294 for (; argtypes && argtypes != void_list_node;
10295 argtypes = TREE_CHAIN (argtypes))
10296 if (TREE_PURPOSE (argtypes))
10298 TREE_PURPOSE (argtypes) = NULL_TREE;
10299 if (operator_code == POSTINCREMENT_EXPR
10300 || operator_code == POSTDECREMENT_EXPR)
10302 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10307 error ("%qD cannot have default arguments", decl);
10315 /* Return a string giving the keyword associate with CODE. */
10317 static const char *
10318 tag_name (enum tag_types code)
10330 case typename_type:
10333 gcc_unreachable ();
10337 /* Name lookup in an elaborated-type-specifier (after the keyword
10338 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10339 elaborated-type-specifier is invalid, issue a diagnostic and return
10340 error_mark_node; otherwise, return the *_TYPE to which it referred.
10341 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10344 check_elaborated_type_specifier (enum tag_types tag_code,
10346 bool allow_template_p)
10352 struct S { struct S *p; };
10354 name lookup will find the TYPE_DECL for the implicit "S::S"
10355 typedef. Adjust for that here. */
10356 if (DECL_SELF_REFERENCE_P (decl))
10357 decl = TYPE_NAME (TREE_TYPE (decl));
10359 type = TREE_TYPE (decl);
10361 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10362 is false for this case as well. */
10363 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10365 error ("using template type parameter %qT after %qs",
10366 type, tag_name (tag_code));
10367 return error_mark_node;
10371 If the identifier resolves to a typedef-name or a template
10372 type-parameter, the elaborated-type-specifier is ill-formed.
10374 In other words, the only legitimate declaration to use in the
10375 elaborated type specifier is the implicit typedef created when
10376 the type is declared. */
10377 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10378 && tag_code != typename_type)
10380 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10381 error ("%q+D has a previous declaration here", decl);
10382 return error_mark_node;
10384 else if (TREE_CODE (type) != RECORD_TYPE
10385 && TREE_CODE (type) != UNION_TYPE
10386 && tag_code != enum_type
10387 && tag_code != typename_type)
10389 error ("%qT referred to as %qs", type, tag_name (tag_code));
10390 error ("%q+T has a previous declaration here", type);
10391 return error_mark_node;
10393 else if (TREE_CODE (type) != ENUMERAL_TYPE
10394 && tag_code == enum_type)
10396 error ("%qT referred to as enum", type);
10397 error ("%q+T has a previous declaration here", type);
10398 return error_mark_node;
10400 else if (!allow_template_p
10401 && TREE_CODE (type) == RECORD_TYPE
10402 && CLASSTYPE_IS_TEMPLATE (type))
10404 /* If a class template appears as elaborated type specifier
10405 without a template header such as:
10407 template <class T> class C {};
10408 void f(class C); // No template header here
10410 then the required template argument is missing. */
10411 error ("template argument required for %<%s %T%>",
10412 tag_name (tag_code),
10413 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10414 return error_mark_node;
10420 /* Lookup NAME in elaborate type specifier in scope according to
10421 SCOPE and issue diagnostics if necessary.
10422 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10423 found, and ERROR_MARK_NODE for type error. */
10426 lookup_and_check_tag (enum tag_types tag_code, tree name,
10427 tag_scope scope, bool template_header_p)
10431 if (scope == ts_global)
10433 /* First try ordinary name lookup, ignoring hidden class name
10434 injected via friend declaration. */
10435 decl = lookup_name_prefer_type (name, 2);
10436 /* If that fails, the name will be placed in the smallest
10437 non-class, non-function-prototype scope according to 3.3.1/5.
10438 We may already have a hidden name declared as friend in this
10439 scope. So lookup again but not ignoring hidden names.
10440 If we find one, that name will be made visible rather than
10441 creating a new tag. */
10443 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10446 decl = lookup_type_scope (name, scope);
10448 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10449 decl = DECL_TEMPLATE_RESULT (decl);
10451 if (decl && TREE_CODE (decl) == TYPE_DECL)
10453 /* Look for invalid nested type:
10457 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10459 error ("%qD has the same name as the class in which it is "
10462 return error_mark_node;
10465 /* Two cases we need to consider when deciding if a class
10466 template is allowed as an elaborated type specifier:
10467 1. It is a self reference to its own class.
10468 2. It comes with a template header.
10472 template <class T> class C {
10473 class C *c1; // DECL_SELF_REFERENCE_P is true
10476 template <class U> class C; // template_header_p is true
10477 template <class T> class C<T>::D {
10478 class C *c2; // DECL_SELF_REFERENCE_P is true
10481 t = check_elaborated_type_specifier (tag_code,
10484 | DECL_SELF_REFERENCE_P (decl));
10487 else if (decl && TREE_CODE (decl) == TREE_LIST)
10489 error ("reference to %qD is ambiguous", name);
10490 print_candidates (decl);
10491 return error_mark_node;
10497 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10498 Define the tag as a forward-reference if it is not defined.
10500 If a declaration is given, process it here, and report an error if
10501 multiple declarations are not identical.
10503 SCOPE is TS_CURRENT when this is also a definition. Only look in
10504 the current frame for the name (since C++ allows new names in any
10505 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10506 declaration. Only look beginning from the current scope outward up
10507 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10509 TEMPLATE_HEADER_P is true when this declaration is preceded by
10510 a set of template parameters. */
10513 xref_tag (enum tag_types tag_code, tree name,
10514 tag_scope scope, bool template_header_p)
10516 enum tree_code code;
10518 tree context = NULL_TREE;
10520 timevar_push (TV_NAME_LOOKUP);
10522 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10528 code = RECORD_TYPE;
10534 code = ENUMERAL_TYPE;
10537 gcc_unreachable ();
10540 /* In case of anonymous name, xref_tag is only called to
10541 make type node and push name. Name lookup is not required. */
10542 if (ANON_AGGRNAME_P (name))
10545 t = lookup_and_check_tag (tag_code, name,
10546 scope, template_header_p);
10548 if (t == error_mark_node)
10549 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10551 if (scope != ts_current && t && current_class_type
10552 && template_class_depth (current_class_type)
10553 && template_header_p)
10555 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10556 definition of this tag. Since, in addition, we are currently
10557 processing a (member) template declaration of a template
10558 class, we must be very careful; consider:
10565 { template <class V>
10566 friend struct S1; };
10568 Here, the S2::S1 declaration should not be confused with the
10569 outer declaration. In particular, the inner version should
10570 have a template parameter of level 2, not level 1. This
10571 would be particularly important if the member declaration
10574 template <class V = U> friend struct S1;
10576 say, when we should tsubst into `U' when instantiating
10577 S2. On the other hand, when presented with:
10587 we must find the inner binding eventually. We
10588 accomplish this by making sure that the new type we
10589 create to represent this declaration has the right
10591 context = TYPE_CONTEXT (t);
10597 /* If no such tag is yet defined, create a forward-reference node
10598 and record it as the "definition".
10599 When a real declaration of this type is found,
10600 the forward-reference will be altered into a real type. */
10601 if (code == ENUMERAL_TYPE)
10603 error ("use of enum %q#D without previous declaration", name);
10604 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10608 t = make_class_type (code);
10609 TYPE_CONTEXT (t) = context;
10610 t = pushtag (name, t, scope);
10615 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10617 if (!redeclare_class_template (t, current_template_parms))
10618 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10620 else if (!processing_template_decl
10621 && CLASS_TYPE_P (t)
10622 && CLASSTYPE_IS_TEMPLATE (t))
10624 error ("redeclaration of %qT as a non-template", t);
10625 error ("previous declaration %q+D", t);
10626 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10629 /* Make injected friend class visible. */
10630 if (scope != ts_within_enclosing_non_class
10631 && hidden_name_p (TYPE_NAME (t)))
10633 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10634 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10636 if (TYPE_TEMPLATE_INFO (t))
10638 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10639 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10644 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10648 xref_tag_from_type (tree old, tree id, tag_scope scope)
10650 enum tag_types tag_kind;
10652 if (TREE_CODE (old) == RECORD_TYPE)
10653 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10655 tag_kind = union_type;
10657 if (id == NULL_TREE)
10658 id = TYPE_IDENTIFIER (old);
10660 return xref_tag (tag_kind, id, scope, false);
10663 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10664 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10665 access_* node, and the TREE_VALUE is the type of the base-class.
10666 Non-NULL TREE_TYPE indicates virtual inheritance.
10668 Returns true if the binfo hierarchy was successfully created,
10669 false if an error was detected. */
10672 xref_basetypes (tree ref, tree base_list)
10675 tree binfo, base_binfo;
10676 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10677 unsigned max_bases = 0; /* Maximum direct bases. */
10679 tree default_access;
10680 tree igo_prev; /* Track Inheritance Graph Order. */
10682 if (ref == error_mark_node)
10685 /* The base of a derived class is private by default, all others are
10687 default_access = (TREE_CODE (ref) == RECORD_TYPE
10688 && CLASSTYPE_DECLARED_CLASS (ref)
10689 ? access_private_node : access_public_node);
10691 /* First, make sure that any templates in base-classes are
10692 instantiated. This ensures that if we call ourselves recursively
10693 we do not get confused about which classes are marked and which
10695 basep = &base_list;
10698 tree basetype = TREE_VALUE (*basep);
10700 if (!(processing_template_decl && uses_template_parms (basetype))
10701 && !complete_type_or_else (basetype, NULL))
10702 /* An incomplete type. Remove it from the list. */
10703 *basep = TREE_CHAIN (*basep);
10707 if (TREE_TYPE (*basep))
10709 if (CLASS_TYPE_P (basetype))
10710 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10711 basep = &TREE_CHAIN (*basep);
10715 TYPE_MARKED_P (ref) = 1;
10717 /* The binfo slot should be empty, unless this is an (ill-formed)
10719 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10720 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10722 binfo = make_tree_binfo (max_bases);
10724 TYPE_BINFO (ref) = binfo;
10725 BINFO_OFFSET (binfo) = size_zero_node;
10726 BINFO_TYPE (binfo) = ref;
10730 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10731 /* An aggregate cannot have baseclasses. */
10732 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10734 if (TREE_CODE (ref) == UNION_TYPE)
10736 error ("derived union %qT invalid", ref);
10743 if (TYPE_FOR_JAVA (ref))
10745 error ("Java class %qT cannot have multiple bases", ref);
10752 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10754 if (TYPE_FOR_JAVA (ref))
10756 error ("Java class %qT cannot have virtual bases", ref);
10761 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10763 tree access = TREE_PURPOSE (base_list);
10764 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10765 tree basetype = TREE_VALUE (base_list);
10767 if (access == access_default_node)
10768 access = default_access;
10770 if (PACK_EXPANSION_P (basetype))
10771 basetype = PACK_EXPANSION_PATTERN (basetype);
10772 if (TREE_CODE (basetype) == TYPE_DECL)
10773 basetype = TREE_TYPE (basetype);
10774 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10776 error ("base type %qT fails to be a struct or class type",
10781 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10782 TYPE_FOR_JAVA (ref) = 1;
10784 base_binfo = NULL_TREE;
10785 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10787 base_binfo = TYPE_BINFO (basetype);
10788 /* The original basetype could have been a typedef'd type. */
10789 basetype = BINFO_TYPE (base_binfo);
10791 /* Inherit flags from the base. */
10792 TYPE_HAS_NEW_OPERATOR (ref)
10793 |= TYPE_HAS_NEW_OPERATOR (basetype);
10794 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10795 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10796 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10797 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10798 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10799 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10800 CLASSTYPE_REPEATED_BASE_P (ref)
10801 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10804 /* We must do this test after we've seen through a typedef
10806 if (TYPE_MARKED_P (basetype))
10808 if (basetype == ref)
10809 error ("recursive type %qT undefined", basetype);
10811 error ("duplicate base type %qT invalid", basetype);
10815 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10816 /* Regenerate the pack expansion for the bases. */
10817 basetype = make_pack_expansion (basetype);
10819 TYPE_MARKED_P (basetype) = 1;
10821 base_binfo = copy_binfo (base_binfo, basetype, ref,
10822 &igo_prev, via_virtual);
10823 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10824 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10826 BINFO_BASE_APPEND (binfo, base_binfo);
10827 BINFO_BASE_ACCESS_APPEND (binfo, access);
10830 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10831 /* If we have space in the vbase vector, we must have shared at
10832 least one of them, and are therefore diamond shaped. */
10833 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10835 /* Unmark all the types. */
10836 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10837 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10838 TYPE_MARKED_P (ref) = 0;
10840 /* Now see if we have a repeated base type. */
10841 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10843 for (base_binfo = binfo; base_binfo;
10844 base_binfo = TREE_CHAIN (base_binfo))
10846 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10848 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10851 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10853 for (base_binfo = binfo; base_binfo;
10854 base_binfo = TREE_CHAIN (base_binfo))
10855 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10856 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10865 /* Begin compiling the definition of an enumeration type.
10868 UNDERLYING_TYPE is the type that will be used as the storage for
10869 the enumeration type. This should be NULL_TREE if no storage type
10872 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10874 Returns the type object, as yet incomplete.
10875 Also records info about it so that build_enumerator
10876 may be used to declare the individual values as they are read. */
10879 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10883 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10885 /* If this is the real definition for a previous forward reference,
10886 fill in the contents in the same object that used to be the
10887 forward reference. */
10889 enumtype = lookup_and_check_tag (enum_type, name,
10890 /*tag_scope=*/ts_current,
10891 /*template_header_p=*/false);
10893 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10895 error ("multiple definition of %q#T", enumtype);
10896 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10897 /* Clear out TYPE_VALUES, and start again. */
10898 TYPE_VALUES (enumtype) = NULL_TREE;
10902 /* In case of error, make a dummy enum to allow parsing to
10904 if (enumtype == error_mark_node)
10905 name = make_anon_name ();
10907 enumtype = make_node (ENUMERAL_TYPE);
10908 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10911 if (enumtype == error_mark_node)
10916 SET_SCOPED_ENUM_P (enumtype, 1);
10917 begin_scope (sk_scoped_enum, enumtype);
10919 /* [C++0x dcl.enum]p5:
10921 If not explicitly specified, the underlying type of a scoped
10922 enumeration type is int. */
10923 if (!underlying_type)
10924 underlying_type = integer_type_node;
10927 if (underlying_type)
10929 if (CP_INTEGRAL_TYPE_P (underlying_type))
10931 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10932 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10933 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10934 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10935 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
10936 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10937 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10938 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10939 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10940 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10943 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10944 underlying_type, enumtype);
10950 /* After processing and defining all the values of an enumeration type,
10951 install their decls in the enumeration type and finish it off.
10952 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10955 finish_enum (tree enumtype)
10964 bool use_short_enum;
10968 integer_type_kind itk;
10969 tree underlying_type = NULL_TREE;
10970 bool fixed_underlying_type_p
10971 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
10973 /* We built up the VALUES in reverse order. */
10974 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10976 /* For an enum defined in a template, just set the type of the values;
10977 all further processing is postponed until the template is
10978 instantiated. We need to set the type so that tsubst of a CONST_DECL
10980 if (processing_template_decl)
10982 for (values = TYPE_VALUES (enumtype);
10984 values = TREE_CHAIN (values))
10985 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10986 if (at_function_scope_p ())
10987 add_stmt (build_min (TAG_DEFN, enumtype));
10991 /* Determine the minimum and maximum values of the enumerators. */
10992 if (TYPE_VALUES (enumtype))
10994 minnode = maxnode = NULL_TREE;
10996 for (values = TYPE_VALUES (enumtype);
10998 values = TREE_CHAIN (values))
11000 decl = TREE_VALUE (values);
11002 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11003 each enumerator has the type of its enumeration. Prior to the
11004 closing brace, the type of each enumerator is the type of its
11005 initializing value. */
11006 TREE_TYPE (decl) = enumtype;
11008 /* Update the minimum and maximum values, if appropriate. */
11009 value = DECL_INITIAL (decl);
11010 if (value == error_mark_node)
11011 value = integer_zero_node;
11012 /* Figure out what the minimum and maximum values of the
11013 enumerators are. */
11015 minnode = maxnode = value;
11016 else if (tree_int_cst_lt (maxnode, value))
11018 else if (tree_int_cst_lt (value, minnode))
11025 If the enumerator-list is empty, the underlying type is as if
11026 the enumeration had a single enumerator with value 0. */
11027 minnode = maxnode = integer_zero_node;
11029 /* Compute the number of bits require to represent all values of the
11030 enumeration. We must do this before the type of MINNODE and
11031 MAXNODE are transformed, since tree_int_cst_min_precision relies
11032 on the TREE_TYPE of the value it is passed. */
11033 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11034 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11035 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11036 precision = MAX (lowprec, highprec);
11038 if (!fixed_underlying_type_p)
11040 /* Determine the underlying type of the enumeration.
11044 The underlying type of an enumeration is an integral type that
11045 can represent all the enumerator values defined in the
11046 enumeration. It is implementation-defined which integral type is
11047 used as the underlying type for an enumeration except that the
11048 underlying type shall not be larger than int unless the value of
11049 an enumerator cannot fit in an int or unsigned int.
11051 We use "int" or an "unsigned int" as the underlying type, even if
11052 a smaller integral type would work, unless the user has
11053 explicitly requested that we use the smallest possible type. The
11054 user can request that for all enumerations with a command line
11055 flag, or for just one enumeration with an attribute. */
11057 use_short_enum = flag_short_enums
11058 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11060 for (itk = (use_short_enum ? itk_char : itk_int);
11064 underlying_type = integer_types[itk];
11065 if (TYPE_PRECISION (underlying_type) >= precision
11066 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11069 if (itk == itk_none)
11073 IF no integral type can represent all the enumerator values, the
11074 enumeration is ill-formed. */
11075 error ("no integral type can represent all of the enumerator values "
11076 "for %qT", enumtype);
11077 precision = TYPE_PRECISION (long_long_integer_type_node);
11078 underlying_type = integer_types[itk_unsigned_long_long];
11083 The value of sizeof() applied to an enumeration type, an object
11084 of an enumeration type, or an enumerator, is the value of sizeof()
11085 applied to the underlying type. */
11086 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11087 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11088 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11089 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11090 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11091 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11093 /* Set the underlying type of the enumeration type to the
11094 computed enumeration type, restricted to the enumerator
11096 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
11097 set_min_and_max_values_for_integral_type
11098 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11101 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11103 /* Compute the minimum and maximum values for the type.
11107 For an enumeration where emin is the smallest enumerator and emax
11108 is the largest, the values of the enumeration are the values of the
11109 underlying type in the range bmin to bmax, where bmin and bmax are,
11110 respectively, the smallest and largest values of the smallest bit-
11111 field that can store emin and emax. */
11113 /* The middle-end currently assumes that types with TYPE_PRECISION
11114 narrower than their underlying type are suitably zero or sign
11115 extended to fill their mode. g++ doesn't make these guarantees.
11116 Until the middle-end can represent such paradoxical types, we
11117 set the TYPE_PRECISION to the width of the underlying type. */
11118 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11120 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11122 /* Convert each of the enumerators to the type of the underlying
11123 type of the enumeration. */
11124 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11126 location_t saved_location;
11128 decl = TREE_VALUE (values);
11129 saved_location = input_location;
11130 input_location = DECL_SOURCE_LOCATION (decl);
11131 if (fixed_underlying_type_p)
11132 /* If the enumeration type has a fixed underlying type, we
11133 already checked all of the enumerator values. */
11134 value = DECL_INITIAL (decl);
11136 value = perform_implicit_conversion (underlying_type,
11137 DECL_INITIAL (decl),
11138 tf_warning_or_error);
11139 input_location = saved_location;
11141 /* Do not clobber shared ints. */
11142 value = copy_node (value);
11144 TREE_TYPE (value) = enumtype;
11145 DECL_INITIAL (decl) = value;
11148 /* Fix up all variant types of this enum type. */
11149 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11151 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11152 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11153 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11154 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11155 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11156 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11157 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11158 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11159 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11160 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11161 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11164 /* Finish up the scope of a scoped enumeration. */
11165 if (SCOPED_ENUM_P (enumtype))
11168 /* Finish debugging output for this type. */
11169 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11172 /* Build and install a CONST_DECL for an enumeration constant of the
11173 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11174 Assignment of sequential values by default is handled here. */
11177 build_enumerator (tree name, tree value, tree enumtype)
11183 /* If the VALUE was erroneous, pretend it wasn't there; that will
11184 result in the enum being assigned the next value in sequence. */
11185 if (value == error_mark_node)
11188 /* Remove no-op casts from the value. */
11190 STRIP_TYPE_NOPS (value);
11192 if (! processing_template_decl)
11194 /* Validate and default VALUE. */
11195 if (value != NULL_TREE)
11197 value = integral_constant_value (value);
11199 if (TREE_CODE (value) == INTEGER_CST)
11201 value = perform_integral_promotions (value);
11202 constant_expression_warning (value);
11206 error ("enumerator value for %qD is not an integer constant", name);
11211 /* Default based on previous value. */
11212 if (value == NULL_TREE)
11214 if (TYPE_VALUES (enumtype))
11217 unsigned HOST_WIDE_INT lo;
11221 /* The next value is the previous value plus one.
11222 add_double doesn't know the type of the target expression,
11223 so we must check with int_fits_type_p as well. */
11224 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11225 if (error_operand_p (prev_value))
11226 value = error_mark_node;
11229 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11230 TREE_INT_CST_HIGH (prev_value),
11232 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11234 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11238 error ("overflow in enumeration values at %qD", name);
11239 value = error_mark_node;
11244 value = integer_zero_node;
11247 /* Remove no-op casts from the value. */
11248 STRIP_TYPE_NOPS (value);
11250 /* If the underlying type of the enum is fixed, check whether
11251 the enumerator values fits in the underlying type. If it
11252 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11253 if (ENUM_UNDERLYING_TYPE (enumtype)
11255 && TREE_CODE (value) == INTEGER_CST
11256 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11258 error ("enumerator value %E is too large for underlying type %<%T%>",
11259 value, ENUM_UNDERLYING_TYPE (enumtype));
11261 /* Silently convert the value so that we can continue. */
11262 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11267 /* C++ associates enums with global, function, or class declarations. */
11268 context = current_scope ();
11270 /* Build the actual enumeration constant. Note that the enumeration
11271 constants have the underlying type of the enum (if it is fixed)
11272 or the type of their initializer (if the underlying type of the
11273 enum is not fixed):
11277 If the underlying type is fixed, the type of each enumerator
11278 prior to the closing brace is the underlying type; if the
11279 initializing value of an enumerator cannot be represented by
11280 the underlying type, the program is ill-formed. If the
11281 underlying type is not fixed, the type of each enumerator is
11282 the type of its initializing value.
11284 If the underlying type is not fixed, it will be computed by
11285 finish_enum and we will reset the type of this enumerator. Of
11286 course, if we're processing a template, there may be no value. */
11287 type = value ? TREE_TYPE (value) : NULL_TREE;
11289 if (context && context == current_class_type)
11290 /* This enum declaration is local to the class. We need the full
11291 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11292 decl = build_lang_decl (CONST_DECL, name, type);
11294 /* It's a global enum, or it's local to a function. (Note local to
11295 a function could mean local to a class method. */
11296 decl = build_decl (CONST_DECL, name, type);
11298 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11299 TREE_CONSTANT (decl) = 1;
11300 TREE_READONLY (decl) = 1;
11301 DECL_INITIAL (decl) = value;
11303 if (context && context == current_class_type)
11304 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11305 on the TYPE_FIELDS list for `S'. (That's so that you can say
11306 things like `S::i' later.) */
11307 finish_member_declaration (decl);
11311 /* Add this enumeration constant to the list for this type. */
11312 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11315 /* Look for an enumerator with the given NAME within the enumeration
11316 type ENUMTYPE. This routine is used primarily for qualified name
11317 lookup into an enumerator in C++0x, e.g.,
11319 enum class Color { Red, Green, Blue };
11321 Color color = Color::Red;
11323 Returns the value corresponding to the enumerator, or
11324 NULL_TREE if no such enumerator was found. */
11326 lookup_enumerator (tree enumtype, tree name)
11329 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11331 e = purpose_member (name, TYPE_VALUES (enumtype));
11332 return e? TREE_VALUE (e) : NULL_TREE;
11336 /* We're defining DECL. Make sure that it's type is OK. */
11339 check_function_type (tree decl, tree current_function_parms)
11341 tree fntype = TREE_TYPE (decl);
11342 tree return_type = complete_type (TREE_TYPE (fntype));
11344 /* In a function definition, arg types must be complete. */
11345 require_complete_types_for_parms (current_function_parms);
11347 if (dependent_type_p (return_type))
11349 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11350 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11352 tree args = TYPE_ARG_TYPES (fntype);
11354 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11355 error ("return type %q#T is incomplete", return_type);
11357 error ("return type has Java class type %q#T", return_type);
11359 /* Make it return void instead. */
11360 if (TREE_CODE (fntype) == METHOD_TYPE)
11361 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11363 TREE_CHAIN (args));
11365 fntype = build_function_type (void_type_node, args);
11367 = build_exception_variant (fntype,
11368 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11371 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11374 /* Create the FUNCTION_DECL for a function definition.
11375 DECLSPECS and DECLARATOR are the parts of the declaration;
11376 they describe the function's name and the type it returns,
11377 but twisted together in a fashion that parallels the syntax of C.
11379 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11380 DECLARATOR is really the DECL for the function we are about to
11381 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11382 indicating that the function is an inline defined in-class.
11384 This function creates a binding context for the function body
11385 as well as setting up the FUNCTION_DECL in current_function_decl.
11387 For C++, we must first check whether that datum makes any sense.
11388 For example, "class A local_a(1,2);" means that variable local_a
11389 is an aggregate of type A, which should have a constructor
11390 applied to it with the argument list [1, 2].
11392 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11393 or may be a BLOCK if the function has been defined previously
11394 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11395 error_mark_node if the function has never been defined, or
11396 a BLOCK if the function has been defined somewhere. */
11399 start_preparsed_function (tree decl1, tree attrs, int flags)
11401 tree ctype = NULL_TREE;
11404 int doing_friend = 0;
11405 struct cp_binding_level *bl;
11406 tree current_function_parms;
11407 struct c_fileinfo *finfo
11408 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11409 bool honor_interface;
11411 /* Sanity check. */
11412 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11413 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11415 fntype = TREE_TYPE (decl1);
11416 if (TREE_CODE (fntype) == METHOD_TYPE)
11417 ctype = TYPE_METHOD_BASETYPE (fntype);
11419 /* ISO C++ 11.4/5. A friend function defined in a class is in
11420 the (lexical) scope of the class in which it is defined. */
11421 if (!ctype && DECL_FRIEND_P (decl1))
11423 ctype = DECL_FRIEND_CONTEXT (decl1);
11425 /* CTYPE could be null here if we're dealing with a template;
11426 for example, `inline friend float foo()' inside a template
11427 will have no CTYPE set. */
11428 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11434 if (DECL_DECLARED_INLINE_P (decl1)
11435 && lookup_attribute ("noinline", attrs))
11436 warning (0, "inline function %q+D given attribute noinline", decl1);
11438 /* Handle gnu_inline attribute. */
11439 if (GNU_INLINE_P (decl1))
11441 DECL_EXTERNAL (decl1) = 1;
11442 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11443 DECL_INTERFACE_KNOWN (decl1) = 1;
11444 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11447 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11448 /* This is a constructor, we must ensure that any default args
11449 introduced by this definition are propagated to the clones
11450 now. The clones are used directly in overload resolution. */
11451 adjust_clone_args (decl1);
11453 /* Sometimes we don't notice that a function is a static member, and
11454 build a METHOD_TYPE for it. Fix that up now. */
11455 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11456 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11458 revert_static_member_fn (decl1);
11462 /* Set up current_class_type, and enter the scope of the class, if
11465 push_nested_class (ctype);
11466 else if (DECL_STATIC_FUNCTION_P (decl1))
11467 push_nested_class (DECL_CONTEXT (decl1));
11469 /* Now that we have entered the scope of the class, we must restore
11470 the bindings for any template parameters surrounding DECL1, if it
11471 is an inline member template. (Order is important; consider the
11472 case where a template parameter has the same name as a field of
11473 the class.) It is not until after this point that
11474 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11475 if (flags & SF_INCLASS_INLINE)
11476 maybe_begin_member_template_processing (decl1);
11478 /* Effective C++ rule 15. */
11480 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11481 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11482 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11484 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11485 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11486 if (!DECL_INITIAL (decl1))
11487 DECL_INITIAL (decl1) = error_mark_node;
11489 /* This function exists in static storage.
11490 (This does not mean `static' in the C sense!) */
11491 TREE_STATIC (decl1) = 1;
11493 /* We must call push_template_decl after current_class_type is set
11494 up. (If we are processing inline definitions after exiting a
11495 class scope, current_class_type will be NULL_TREE until set above
11496 by push_nested_class.) */
11497 if (processing_template_decl)
11499 /* FIXME: Handle error_mark_node more gracefully. */
11500 tree newdecl1 = push_template_decl (decl1);
11501 if (newdecl1 != error_mark_node)
11505 /* We are now in the scope of the function being defined. */
11506 current_function_decl = decl1;
11508 /* Save the parm names or decls from this function's declarator
11509 where store_parm_decls will find them. */
11510 current_function_parms = DECL_ARGUMENTS (decl1);
11512 /* Make sure the parameter and return types are reasonable. When
11513 you declare a function, these types can be incomplete, but they
11514 must be complete when you define the function. */
11515 check_function_type (decl1, current_function_parms);
11517 /* Build the return declaration for the function. */
11518 restype = TREE_TYPE (fntype);
11519 if (DECL_RESULT (decl1) == NULL_TREE)
11523 resdecl = build_decl (RESULT_DECL, 0, restype);
11524 DECL_ARTIFICIAL (resdecl) = 1;
11525 DECL_IGNORED_P (resdecl) = 1;
11526 DECL_RESULT (decl1) = resdecl;
11528 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11531 /* Let the user know we're compiling this function. */
11532 announce_function (decl1);
11534 /* Record the decl so that the function name is defined.
11535 If we already have a decl for this name, and it is a FUNCTION_DECL,
11536 use the old decl. */
11537 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11539 /* A specialization is not used to guide overload resolution. */
11540 if (!DECL_FUNCTION_MEMBER_P (decl1)
11541 && !(DECL_USE_TEMPLATE (decl1) &&
11542 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11544 tree olddecl = pushdecl (decl1);
11546 if (olddecl == error_mark_node)
11547 /* If something went wrong when registering the declaration,
11548 use DECL1; we have to have a FUNCTION_DECL to use when
11549 parsing the body of the function. */
11553 /* Otherwise, OLDDECL is either a previous declaration
11554 of the same function or DECL1 itself. */
11556 if (warn_missing_declarations
11557 && olddecl == decl1
11558 && !DECL_MAIN_P (decl1)
11559 && TREE_PUBLIC (decl1)
11560 && !DECL_DECLARED_INLINE_P (decl1))
11564 /* Check whether DECL1 is in an anonymous
11566 for (context = DECL_CONTEXT (decl1);
11568 context = DECL_CONTEXT (context))
11570 if (TREE_CODE (context) == NAMESPACE_DECL
11571 && DECL_NAME (context) == NULL_TREE)
11575 if (context == NULL)
11576 warning (OPT_Wmissing_declarations,
11577 "no previous declaration for %q+D", decl1);
11585 /* We need to set the DECL_CONTEXT. */
11586 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11587 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11589 fntype = TREE_TYPE (decl1);
11591 /* If #pragma weak applies, mark the decl appropriately now.
11592 The pragma only applies to global functions. Because
11593 determining whether or not the #pragma applies involves
11594 computing the mangled name for the declaration, we cannot
11595 apply the pragma until after we have merged this declaration
11596 with any previous declarations; if the original declaration
11597 has a linkage specification, that specification applies to
11598 the definition as well, and may affect the mangled name. */
11599 if (!DECL_CONTEXT (decl1))
11600 maybe_apply_pragma_weak (decl1);
11603 /* Reset this in case the call to pushdecl changed it. */
11604 current_function_decl = decl1;
11606 gcc_assert (DECL_INITIAL (decl1));
11608 /* This function may already have been parsed, in which case just
11609 return; our caller will skip over the body without parsing. */
11610 if (DECL_INITIAL (decl1) != error_mark_node)
11613 /* Initialize RTL machinery. We cannot do this until
11614 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11615 even when processing a template; this is how we get
11616 CFUN set up, and our per-function variables initialized.
11617 FIXME factor out the non-RTL stuff. */
11618 bl = current_binding_level;
11619 allocate_struct_function (decl1, processing_template_decl);
11621 /* Initialize the language data structures. Whenever we start
11622 a new function, we destroy temporaries in the usual way. */
11623 cfun->language = GGC_CNEW (struct language_function);
11624 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11625 current_binding_level = bl;
11627 /* Even though we're inside a function body, we still don't want to
11628 call expand_expr to calculate the size of a variable-sized array.
11629 We haven't necessarily assigned RTL to all variables yet, so it's
11630 not safe to try to expand expressions involving them. */
11631 cfun->dont_save_pending_sizes_p = 1;
11633 /* Start the statement-tree, start the tree now. */
11634 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11636 /* If we are (erroneously) defining a function that we have already
11637 defined before, wipe out what we knew before. */
11638 if (!DECL_PENDING_INLINE_P (decl1))
11639 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11641 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11643 /* We know that this was set up by `grokclassfn'. We do not
11644 wait until `store_parm_decls', since evil parse errors may
11645 never get us to that point. Here we keep the consistency
11646 between `current_class_type' and `current_class_ptr'. */
11647 tree t = DECL_ARGUMENTS (decl1);
11649 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11650 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11652 cp_function_chain->x_current_class_ref
11653 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11654 cp_function_chain->x_current_class_ptr = t;
11656 /* Constructors and destructors need to know whether they're "in
11657 charge" of initializing virtual base classes. */
11658 t = TREE_CHAIN (t);
11659 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11661 current_in_charge_parm = t;
11662 t = TREE_CHAIN (t);
11664 if (DECL_HAS_VTT_PARM_P (decl1))
11666 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11667 current_vtt_parm = t;
11671 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11672 /* Implicitly-defined methods (like the
11673 destructor for a class in which no destructor
11674 is explicitly declared) must not be defined
11675 until their definition is needed. So, we
11676 ignore interface specifications for
11677 compiler-generated functions. */
11678 && !DECL_ARTIFICIAL (decl1));
11680 if (DECL_INTERFACE_KNOWN (decl1))
11682 tree ctx = decl_function_context (decl1);
11684 if (DECL_NOT_REALLY_EXTERN (decl1))
11685 DECL_EXTERNAL (decl1) = 0;
11687 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11688 && TREE_PUBLIC (ctx))
11689 /* This is a function in a local class in an extern inline
11691 comdat_linkage (decl1);
11693 /* If this function belongs to an interface, it is public.
11694 If it belongs to someone else's interface, it is also external.
11695 This only affects inlines and template instantiations. */
11696 else if (!finfo->interface_unknown && honor_interface)
11698 if (DECL_DECLARED_INLINE_P (decl1)
11699 || DECL_TEMPLATE_INSTANTIATION (decl1)
11700 || processing_template_decl)
11702 DECL_EXTERNAL (decl1)
11703 = (finfo->interface_only
11704 || (DECL_DECLARED_INLINE_P (decl1)
11705 && ! flag_implement_inlines
11706 && !DECL_VINDEX (decl1)));
11708 /* For WIN32 we also want to put these in linkonce sections. */
11709 maybe_make_one_only (decl1);
11712 DECL_EXTERNAL (decl1) = 0;
11713 DECL_INTERFACE_KNOWN (decl1) = 1;
11714 /* If this function is in an interface implemented in this file,
11715 make sure that the back end knows to emit this function
11717 if (!DECL_EXTERNAL (decl1))
11718 mark_needed (decl1);
11720 else if (finfo->interface_unknown && finfo->interface_only
11721 && honor_interface)
11723 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11724 interface, we will have both finfo->interface_unknown and
11725 finfo->interface_only set. In that case, we don't want to
11726 use the normal heuristics because someone will supply a
11727 #pragma implementation elsewhere, and deducing it here would
11728 produce a conflict. */
11729 comdat_linkage (decl1);
11730 DECL_EXTERNAL (decl1) = 0;
11731 DECL_INTERFACE_KNOWN (decl1) = 1;
11732 DECL_DEFER_OUTPUT (decl1) = 1;
11736 /* This is a definition, not a reference.
11737 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11738 if (!GNU_INLINE_P (decl1))
11739 DECL_EXTERNAL (decl1) = 0;
11741 if ((DECL_DECLARED_INLINE_P (decl1)
11742 || DECL_TEMPLATE_INSTANTIATION (decl1))
11743 && ! DECL_INTERFACE_KNOWN (decl1)
11744 /* Don't try to defer nested functions for now. */
11745 && ! decl_function_context (decl1))
11746 DECL_DEFER_OUTPUT (decl1) = 1;
11748 DECL_INTERFACE_KNOWN (decl1) = 1;
11751 /* Determine the ELF visibility attribute for the function. We must not
11752 do this before calling "pushdecl", as we must allow "duplicate_decls"
11753 to merge any attributes appropriately. We also need to wait until
11755 if (!DECL_CLONED_FUNCTION_P (decl1))
11756 determine_visibility (decl1);
11758 begin_scope (sk_function_parms, decl1);
11762 if (DECL_DESTRUCTOR_P (decl1)
11763 || (DECL_CONSTRUCTOR_P (decl1)
11764 && targetm.cxx.cdtor_returns_this ()))
11766 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11767 DECL_CONTEXT (cdtor_label) = current_function_decl;
11770 start_fname_decls ();
11772 store_parm_decls (current_function_parms);
11776 /* Like start_preparsed_function, except that instead of a
11777 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11779 Returns 1 on success. If the DECLARATOR is not suitable for a function
11780 (it defines a datum instead), we return 0, which tells
11781 yyparse to report a parse error. */
11784 start_function (cp_decl_specifier_seq *declspecs,
11785 const cp_declarator *declarator,
11790 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11791 if (decl1 == error_mark_node)
11793 /* If the declarator is not suitable for a function definition,
11794 cause a syntax error. */
11795 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11797 error ("invalid function declaration");
11801 if (DECL_MAIN_P (decl1))
11802 /* main must return int. grokfndecl should have corrected it
11803 (and issued a diagnostic) if the user got it wrong. */
11804 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11805 integer_type_node));
11807 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11812 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11816 use_eh_spec_block (tree fn)
11818 return (flag_exceptions && flag_enforce_eh_specs
11819 && !processing_template_decl
11820 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11821 /* We insert the EH_SPEC_BLOCK only in the original
11822 function; then, it is copied automatically to the
11824 && !DECL_CLONED_FUNCTION_P (fn)
11825 /* Implicitly-generated constructors and destructors have
11826 exception specifications. However, those specifications
11827 are the union of the possible exceptions specified by the
11828 constructors/destructors for bases and members, so no
11829 unallowed exception will ever reach this function. By
11830 not creating the EH_SPEC_BLOCK we save a little memory,
11831 and we avoid spurious warnings about unreachable
11833 && !DECL_ARTIFICIAL (fn));
11836 /* Store the parameter declarations into the current function declaration.
11837 This is called after parsing the parameter declarations, before
11838 digesting the body of the function.
11840 Also install to binding contour return value identifier, if any. */
11843 store_parm_decls (tree current_function_parms)
11845 tree fndecl = current_function_decl;
11848 /* This is a chain of any other decls that came in among the parm
11849 declarations. If a parm is declared with enum {foo, bar} x;
11850 then CONST_DECLs for foo and bar are put here. */
11851 tree nonparms = NULL_TREE;
11853 if (current_function_parms)
11855 /* This case is when the function was defined with an ANSI prototype.
11856 The parms already have decls, so we need not do anything here
11857 except record them as in effect
11858 and complain if any redundant old-style parm decls were written. */
11860 tree specparms = current_function_parms;
11863 /* Must clear this because it might contain TYPE_DECLs declared
11865 current_binding_level->names = NULL;
11867 /* If we're doing semantic analysis, then we'll call pushdecl
11868 for each of these. We must do them in reverse order so that
11869 they end in the correct forward order. */
11870 specparms = nreverse (specparms);
11872 for (parm = specparms; parm; parm = next)
11874 next = TREE_CHAIN (parm);
11875 if (TREE_CODE (parm) == PARM_DECL)
11877 if (DECL_NAME (parm) == NULL_TREE
11878 || TREE_CODE (parm) != VOID_TYPE)
11881 error ("parameter %qD declared void", parm);
11885 /* If we find an enum constant or a type tag,
11886 put it aside for the moment. */
11887 TREE_CHAIN (parm) = NULL_TREE;
11888 nonparms = chainon (nonparms, parm);
11892 /* Get the decls in their original chain order and record in the
11893 function. This is all and only the PARM_DECLs that were
11894 pushed into scope by the loop above. */
11895 DECL_ARGUMENTS (fndecl) = getdecls ();
11898 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11900 /* Now store the final chain of decls for the arguments
11901 as the decl-chain of the current lexical scope.
11902 Put the enumerators in as well, at the front so that
11903 DECL_ARGUMENTS is not modified. */
11904 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11906 if (use_eh_spec_block (current_function_decl))
11907 current_eh_spec_block = begin_eh_spec_block ();
11911 /* We have finished doing semantic analysis on DECL, but have not yet
11912 generated RTL for its body. Save away our current state, so that
11913 when we want to generate RTL later we know what to do. */
11916 save_function_data (tree decl)
11918 struct language_function *f;
11920 /* Save the language-specific per-function data so that we can
11921 get it back when we really expand this function. */
11922 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11925 f = GGC_NEW (struct language_function);
11926 memcpy (f, cp_function_chain, sizeof (struct language_function));
11927 DECL_SAVED_FUNCTION_DATA (decl) = f;
11929 /* Clear out the bits we don't need. */
11930 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11931 f->bindings = NULL;
11932 f->x_local_names = NULL;
11936 /* Set the return value of the constructor (if present). */
11939 finish_constructor_body (void)
11944 if (targetm.cxx.cdtor_returns_this ()
11945 && (! TYPE_FOR_JAVA (current_class_type)))
11947 /* Any return from a constructor will end up here. */
11948 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11950 val = DECL_ARGUMENTS (current_function_decl);
11951 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11952 DECL_RESULT (current_function_decl), val);
11953 /* Return the address of the object. */
11954 exprstmt = build_stmt (RETURN_EXPR, val);
11955 add_stmt (exprstmt);
11959 /* Do all the processing for the beginning of a destructor; set up the
11960 vtable pointers and cleanups for bases and members. */
11963 begin_destructor_body (void)
11965 tree compound_stmt;
11967 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11968 issued an error message. We still want to try to process the
11969 body of the function, but initialize_vtbl_ptrs will crash if
11970 TYPE_BINFO is NULL. */
11971 if (COMPLETE_TYPE_P (current_class_type))
11973 compound_stmt = begin_compound_stmt (0);
11974 /* Make all virtual function table pointers in non-virtual base
11975 classes point to CURRENT_CLASS_TYPE's virtual function
11977 initialize_vtbl_ptrs (current_class_ptr);
11978 finish_compound_stmt (compound_stmt);
11980 /* And insert cleanups for our bases and members so that they
11981 will be properly destroyed if we throw. */
11982 push_base_cleanups ();
11986 /* At the end of every destructor we generate code to delete the object if
11987 necessary. Do that now. */
11990 finish_destructor_body (void)
11994 /* Any return from a destructor will end up here; that way all base
11995 and member cleanups will be run when the function returns. */
11996 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11998 /* In a virtual destructor, we must call delete. */
11999 if (DECL_VIRTUAL_P (current_function_decl))
12002 tree virtual_size = cxx_sizeof (current_class_type);
12006 At the point of definition of a virtual destructor (including
12007 an implicit definition), non-placement operator delete shall
12008 be looked up in the scope of the destructor's class and if
12009 found shall be accessible and unambiguous. */
12010 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12012 /*global_p=*/false,
12013 /*placement=*/NULL_TREE,
12014 /*alloc_fn=*/NULL_TREE);
12016 if_stmt = begin_if_stmt ();
12017 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12018 current_in_charge_parm,
12021 finish_expr_stmt (exprstmt);
12022 finish_then_clause (if_stmt);
12023 finish_if_stmt (if_stmt);
12026 if (targetm.cxx.cdtor_returns_this ())
12030 val = DECL_ARGUMENTS (current_function_decl);
12031 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12032 DECL_RESULT (current_function_decl), val);
12033 /* Return the address of the object. */
12034 exprstmt = build_stmt (RETURN_EXPR, val);
12035 add_stmt (exprstmt);
12039 /* Do the necessary processing for the beginning of a function body, which
12040 in this case includes member-initializers, but not the catch clauses of
12041 a function-try-block. Currently, this means opening a binding level
12042 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12045 begin_function_body (void)
12049 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12052 if (processing_template_decl)
12053 /* Do nothing now. */;
12055 /* Always keep the BLOCK node associated with the outermost pair of
12056 curly braces of a function. These are needed for correct
12057 operation of dwarfout.c. */
12058 keep_next_level (true);
12060 stmt = begin_compound_stmt (BCS_FN_BODY);
12062 if (processing_template_decl)
12063 /* Do nothing now. */;
12064 else if (DECL_DESTRUCTOR_P (current_function_decl))
12065 begin_destructor_body ();
12070 /* Do the processing for the end of a function body. Currently, this means
12071 closing out the cleanups for fully-constructed bases and members, and in
12072 the case of the destructor, deleting the object if desired. Again, this
12073 is only meaningful for [cd]tors, since they are the only functions where
12074 there is a significant distinction between the main body and any
12075 function catch clauses. Handling, say, main() return semantics here
12076 would be wrong, as flowing off the end of a function catch clause for
12077 main() would also need to return 0. */
12080 finish_function_body (tree compstmt)
12082 if (compstmt == NULL_TREE)
12085 /* Close the block. */
12086 finish_compound_stmt (compstmt);
12088 if (processing_template_decl)
12089 /* Do nothing now. */;
12090 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12091 finish_constructor_body ();
12092 else if (DECL_DESTRUCTOR_P (current_function_decl))
12093 finish_destructor_body ();
12096 /* Given a function, returns the BLOCK corresponding to the outermost level
12097 of curly braces, skipping the artificial block created for constructor
12101 outer_curly_brace_block (tree fndecl)
12103 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12104 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12105 /* Skip the artificial function body block. */
12106 block = BLOCK_SUBBLOCKS (block);
12110 /* Finish up a function declaration and compile that function
12111 all the way to assembler language output. The free the storage
12112 for the function definition.
12114 FLAGS is a bitwise or of the following values:
12116 We just finished processing the body of an in-class inline
12117 function definition. (This processing will have taken place
12118 after the class definition is complete.) */
12121 finish_function (int flags)
12123 tree fndecl = current_function_decl;
12124 tree fntype, ctype = NULL_TREE;
12125 int inclass_inline = (flags & 2) != 0;
12128 /* When we get some parse errors, we can end up without a
12129 current_function_decl, so cope. */
12130 if (fndecl == NULL_TREE)
12131 return error_mark_node;
12133 gcc_assert (!defer_mark_used_calls);
12134 defer_mark_used_calls = true;
12136 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12137 && DECL_VIRTUAL_P (fndecl)
12138 && !processing_template_decl)
12140 tree fnclass = DECL_CONTEXT (fndecl);
12141 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12142 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12145 nested = function_depth > 1;
12146 fntype = TREE_TYPE (fndecl);
12148 /* TREE_READONLY (fndecl) = 1;
12149 This caused &foo to be of type ptr-to-const-function
12150 which then got a warning when stored in a ptr-to-function variable. */
12152 gcc_assert (building_stmt_tree ());
12153 /* The current function is being defined, so its DECL_INITIAL should
12154 be set, and unless there's a multiple definition, it should be
12155 error_mark_node. */
12156 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12158 /* For a cloned function, we've already got all the code we need;
12159 there's no need to add any extra bits. */
12160 if (!DECL_CLONED_FUNCTION_P (fndecl))
12162 if (DECL_MAIN_P (current_function_decl))
12166 /* Make it so that `main' always returns 0 by default (or
12169 stmt = finish_return_stmt (integer_one_node);
12171 stmt = finish_return_stmt (integer_zero_node);
12173 /* Hack. We don't want the middle-end to warn that this
12174 return is unreachable, so put the statement on the
12177 location_t linezero = linemap_line_start (line_table, 0, 1);
12178 SET_EXPR_LOCATION (stmt, linezero);
12182 if (use_eh_spec_block (current_function_decl))
12183 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12184 (TREE_TYPE (current_function_decl)),
12185 current_eh_spec_block);
12188 /* If we're saving up tree structure, tie off the function now. */
12189 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12191 finish_fname_decls ();
12193 /* If this function can't throw any exceptions, remember that. */
12194 if (!processing_template_decl
12195 && !cp_function_chain->can_throw
12196 && !flag_non_call_exceptions
12197 && !DECL_REPLACEABLE_P (fndecl))
12198 TREE_NOTHROW (fndecl) = 1;
12200 /* This must come after expand_function_end because cleanups might
12201 have declarations (from inline functions) that need to go into
12202 this function's blocks. */
12204 /* If the current binding level isn't the outermost binding level
12205 for this function, either there is a bug, or we have experienced
12206 syntax errors and the statement tree is malformed. */
12207 if (current_binding_level->kind != sk_function_parms)
12209 /* Make sure we have already experienced errors. */
12210 gcc_assert (errorcount);
12212 /* Throw away the broken statement tree and extra binding
12214 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12216 while (current_binding_level->kind != sk_function_parms)
12218 if (current_binding_level->kind == sk_class)
12219 pop_nested_class ();
12221 poplevel (0, 0, 0);
12224 poplevel (1, 0, 1);
12226 /* Statements should always be full-expressions at the outermost set
12227 of curly braces for a function. */
12228 gcc_assert (stmts_are_full_exprs_p ());
12230 /* Set up the named return value optimization, if we can. Candidate
12231 variables are selected in check_return_expr. */
12232 if (current_function_return_value)
12234 tree r = current_function_return_value;
12237 if (r != error_mark_node
12238 /* This is only worth doing for fns that return in memory--and
12239 simpler, since we don't have to worry about promoted modes. */
12240 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12241 /* Only allow this for variables declared in the outer scope of
12242 the function so we know that their lifetime always ends with a
12243 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12244 we were to do this optimization in tree-ssa. */
12245 && (outer = outer_curly_brace_block (fndecl))
12246 && chain_member (r, BLOCK_VARS (outer)))
12247 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12249 current_function_return_value = NULL_TREE;
12252 /* Remember that we were in class scope. */
12253 if (current_class_name)
12254 ctype = current_class_type;
12256 /* Must mark the RESULT_DECL as being in this function. */
12257 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12259 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12260 to the FUNCTION_DECL node itself. */
12261 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12263 /* Save away current state, if appropriate. */
12264 if (!processing_template_decl)
12265 save_function_data (fndecl);
12267 /* Complain if there's just no return statement. */
12268 if (warn_return_type
12269 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12270 && !dependent_type_p (TREE_TYPE (fntype))
12271 && !current_function_returns_value && !current_function_returns_null
12272 /* Don't complain if we abort or throw. */
12273 && !current_function_returns_abnormally
12274 && !DECL_NAME (DECL_RESULT (fndecl))
12275 && !TREE_NO_WARNING (fndecl)
12276 /* Structor return values (if any) are set by the compiler. */
12277 && !DECL_CONSTRUCTOR_P (fndecl)
12278 && !DECL_DESTRUCTOR_P (fndecl))
12280 warning (OPT_Wreturn_type,
12281 "no return statement in function returning non-void");
12282 TREE_NO_WARNING (fndecl) = 1;
12285 /* Store the end of the function, so that we get good line number
12286 info for the epilogue. */
12287 cfun->function_end_locus = input_location;
12289 /* Genericize before inlining. */
12290 if (!processing_template_decl)
12292 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12293 cp_genericize (fndecl);
12294 /* Clear out the bits we don't need. */
12295 f->x_current_class_ptr = NULL;
12296 f->x_current_class_ref = NULL;
12297 f->x_eh_spec_block = NULL;
12298 f->x_in_charge_parm = NULL;
12299 f->x_vtt_parm = NULL;
12300 f->x_return_value = NULL;
12301 f->bindings = NULL;
12302 f->extern_decl_map = NULL;
12304 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12305 c_warn_unused_result (gimple_body (fndecl));
12307 /* Clear out the bits we don't need. */
12308 local_names = NULL;
12310 /* We're leaving the context of this function, so zap cfun. It's still in
12311 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12313 current_function_decl = NULL;
12315 /* If this is an in-class inline definition, we may have to pop the
12316 bindings for the template parameters that we added in
12317 maybe_begin_member_template_processing when start_function was
12319 if (inclass_inline)
12320 maybe_end_member_template_processing ();
12322 /* Leave the scope of the class. */
12324 pop_nested_class ();
12330 /* Let the error reporting routines know that we're outside a
12331 function. For a nested function, this value is used in
12332 cxx_pop_function_context and then reset via pop_function_context. */
12333 current_function_decl = NULL_TREE;
12335 defer_mark_used_calls = false;
12336 if (deferred_mark_used_calls)
12341 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12343 VEC_free (tree, gc, deferred_mark_used_calls);
12349 /* Create the FUNCTION_DECL for a function definition.
12350 DECLSPECS and DECLARATOR are the parts of the declaration;
12351 they describe the return type and the name of the function,
12352 but twisted together in a fashion that parallels the syntax of C.
12354 This function creates a binding context for the function body
12355 as well as setting up the FUNCTION_DECL in current_function_decl.
12357 Returns a FUNCTION_DECL on success.
12359 If the DECLARATOR is not suitable for a function (it defines a datum
12360 instead), we return 0, which tells yyparse to report a parse error.
12362 May return void_type_node indicating that this method is actually
12363 a friend. See grokfield for more details.
12365 Came here with a `.pushlevel' .
12367 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12368 CHANGES TO CODE IN `grokfield'. */
12371 start_method (cp_decl_specifier_seq *declspecs,
12372 const cp_declarator *declarator, tree attrlist)
12374 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12377 if (fndecl == error_mark_node)
12378 return error_mark_node;
12380 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12382 error ("invalid member function declaration");
12383 return error_mark_node;
12387 cplus_decl_attributes (&fndecl, attrlist, 0);
12389 /* Pass friends other than inline friend functions back. */
12390 if (fndecl == void_type_node)
12393 if (DECL_IN_AGGR_P (fndecl))
12395 if (DECL_CONTEXT (fndecl)
12396 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12397 error ("%qD is already defined in class %qT", fndecl,
12398 DECL_CONTEXT (fndecl));
12399 return error_mark_node;
12402 check_template_shadow (fndecl);
12404 DECL_DECLARED_INLINE_P (fndecl) = 1;
12405 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12407 /* We process method specializations in finish_struct_1. */
12408 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12410 fndecl = push_template_decl (fndecl);
12411 if (fndecl == error_mark_node)
12415 if (! DECL_FRIEND_P (fndecl))
12417 if (TREE_CHAIN (fndecl))
12419 fndecl = copy_node (fndecl);
12420 TREE_CHAIN (fndecl) = NULL_TREE;
12424 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12426 /* Make a place for the parms. */
12427 begin_scope (sk_function_parms, fndecl);
12429 DECL_IN_AGGR_P (fndecl) = 1;
12433 /* Go through the motions of finishing a function definition.
12434 We don't compile this method until after the whole class has
12437 FINISH_METHOD must return something that looks as though it
12438 came from GROKFIELD (since we are defining a method, after all).
12440 This is called after parsing the body of the function definition.
12441 STMTS is the chain of statements that makes up the function body.
12443 DECL is the ..._DECL that `start_method' provided. */
12446 finish_method (tree decl)
12448 tree fndecl = decl;
12453 if (decl == void_type_node)
12456 old_initial = DECL_INITIAL (fndecl);
12458 /* Undo the level for the parms (from start_method).
12459 This is like poplevel, but it causes nothing to be
12460 saved. Saving information here confuses symbol-table
12461 output routines. Besides, this information will
12462 be correctly output when this method is actually
12465 /* Clear out the meanings of the local variables of this level;
12466 also record in each decl which block it belongs to. */
12468 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12470 if (DECL_NAME (link) != NULL_TREE)
12471 pop_binding (DECL_NAME (link), link);
12472 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12473 DECL_CONTEXT (link) = NULL_TREE;
12476 poplevel (0, 0, 0);
12478 DECL_INITIAL (fndecl) = old_initial;
12480 /* We used to check if the context of FNDECL was different from
12481 current_class_type as another way to get inside here. This didn't work
12482 for String.cc in libg++. */
12483 if (DECL_FRIEND_P (fndecl))
12485 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12487 decl = void_type_node;
12494 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12495 we can lay it out later, when and if its type becomes complete. */
12498 maybe_register_incomplete_var (tree var)
12500 gcc_assert (TREE_CODE (var) == VAR_DECL);
12502 /* Keep track of variables with incomplete types. */
12503 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12504 && DECL_EXTERNAL (var))
12506 tree inner_type = TREE_TYPE (var);
12508 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12509 inner_type = TREE_TYPE (inner_type);
12510 inner_type = TYPE_MAIN_VARIANT (inner_type);
12512 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12513 /* RTTI TD entries are created while defining the type_info. */
12514 || (TYPE_LANG_SPECIFIC (inner_type)
12515 && TYPE_BEING_DEFINED (inner_type)))
12516 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12520 /* Called when a class type (given by TYPE) is defined. If there are
12521 any existing VAR_DECLs whose type has been completed by this
12522 declaration, update them now. */
12525 complete_vars (tree type)
12527 tree *list = &incomplete_vars;
12529 gcc_assert (CLASS_TYPE_P (type));
12532 if (same_type_p (type, TREE_PURPOSE (*list)))
12534 tree var = TREE_VALUE (*list);
12535 tree type = TREE_TYPE (var);
12536 /* Complete the type of the variable. The VAR_DECL itself
12537 will be laid out in expand_expr. */
12538 complete_type (type);
12539 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12540 /* Remove this entry from the list. */
12541 *list = TREE_CHAIN (*list);
12544 list = &TREE_CHAIN (*list);
12547 /* Check for pending declarations which may have abstract type. */
12548 complete_type_check_abstract (type);
12551 /* If DECL is of a type which needs a cleanup, build and return an
12552 expression to perform that cleanup here. Return NULL_TREE if no
12553 cleanup need be done. */
12556 cxx_maybe_build_cleanup (tree decl)
12562 /* Assume no cleanup is required. */
12563 cleanup = NULL_TREE;
12565 if (error_operand_p (decl))
12568 /* Handle "__attribute__((cleanup))". We run the cleanup function
12569 before the destructor since the destructor is what actually
12570 terminates the lifetime of the object. */
12571 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12578 /* Get the name specified by the user for the cleanup function. */
12579 id = TREE_VALUE (TREE_VALUE (attr));
12580 /* Look up the name to find the cleanup function to call. It is
12581 important to use lookup_name here because that is what is
12582 used in c-common.c:handle_cleanup_attribute when performing
12583 initial checks on the attribute. Note that those checks
12584 include ensuring that the function found is not an overloaded
12585 function, or an object with an overloaded call operator,
12586 etc.; we can rely on the fact that the function found is an
12587 ordinary FUNCTION_DECL. */
12588 fn = lookup_name (id);
12589 arg = build_address (decl);
12591 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12593 tf_warning_or_error);
12595 /* Handle ordinary C++ destructors. */
12596 type = TREE_TYPE (decl);
12597 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12599 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12600 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12601 && CLASSTYPE_VBASECLASSES (type));
12605 if (TREE_CODE (type) == ARRAY_TYPE)
12608 addr = build_address (decl);
12610 /* Optimize for space over speed here. */
12611 if (!has_vbases || flag_expensive_optimizations)
12612 flags |= LOOKUP_NONVIRTUAL;
12614 call = build_delete (TREE_TYPE (addr), addr,
12615 sfk_complete_destructor, flags, 0);
12617 cleanup = build_compound_expr (cleanup, call);
12625 /* When a stmt has been parsed, this function is called. */
12632 /* DECL was originally constructed as a non-static member function,
12633 but turned out to be static. Update it accordingly. */
12636 revert_static_member_fn (tree decl)
12639 tree function = TREE_TYPE (decl);
12640 tree args = TYPE_ARG_TYPES (function);
12642 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12643 != TYPE_UNQUALIFIED)
12644 error ("static member function %q#D declared with type qualifiers", decl);
12646 args = TREE_CHAIN (args);
12647 tmp = build_function_type (TREE_TYPE (function), args);
12648 tmp = build_qualified_type (tmp, cp_type_quals (function));
12649 tmp = build_exception_variant (tmp,
12650 TYPE_RAISES_EXCEPTIONS (function));
12651 TREE_TYPE (decl) = tmp;
12652 if (DECL_ARGUMENTS (decl))
12653 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12654 DECL_STATIC_FUNCTION_P (decl) = 1;
12657 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12658 one of the language-independent trees. */
12660 enum cp_tree_node_structure_enum
12661 cp_tree_node_structure (union lang_tree_node * t)
12663 switch (TREE_CODE (&t->generic))
12665 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12666 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12667 case OVERLOAD: return TS_CP_OVERLOAD;
12668 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12669 case PTRMEM_CST: return TS_CP_PTRMEM;
12670 case BASELINK: return TS_CP_BASELINK;
12671 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12672 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12673 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12674 default: return TS_CP_GENERIC;
12678 /* Build the void_list_node (void_type_node having been created). */
12680 build_void_list_node (void)
12682 tree t = build_tree_list (NULL_TREE, void_type_node);
12687 cp_missing_noreturn_ok_p (tree decl)
12689 /* A missing noreturn is ok for the `main' function. */
12690 return DECL_MAIN_P (decl);
12693 /* Return the COMDAT group into which DECL should be placed. */
12696 cxx_comdat_group (tree decl)
12700 /* Virtual tables, construction virtual tables, and virtual table
12701 tables all go in a single COMDAT group, named after the primary
12703 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12704 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12705 /* For all other DECLs, the COMDAT group is the mangled name of the
12706 declaration itself. */
12709 while (DECL_THUNK_P (decl))
12711 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12712 into the same section as the target function. In that case
12713 we must return target's name. */
12714 tree target = THUNK_TARGET (decl);
12715 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12716 && DECL_SECTION_NAME (target) != NULL
12717 && DECL_ONE_ONLY (target))
12722 name = DECL_ASSEMBLER_NAME (decl);
12725 return IDENTIFIER_POINTER (name);
12728 #include "gt-cp-decl.h"