1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* Process declarations and symbol lookup for C++ front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
32 #include "coretypes.h"
39 #include "tree-inline.h"
49 #include "diagnostic.h"
53 #include "tree-flow.h"
54 #include "pointer-set.h"
56 static tree grokparms (cp_parameter_declarator *, tree *);
57 static const char *redeclaration_error_message (tree, tree);
59 static int decl_jump_unsafe (tree);
60 static void require_complete_types_for_parms (tree);
61 static int ambi_op_p (enum tree_code);
62 static int unary_op_p (enum tree_code);
63 static void push_local_name (tree);
64 static tree grok_reference_init (tree, tree, tree, tree *);
65 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
67 static void record_unknown_type (tree, const char *);
68 static tree builtin_function_1 (tree, tree);
69 static tree build_library_fn_1 (tree, enum tree_code, tree);
70 static int member_function_or_else (tree, tree, enum overload_flags);
71 static void bad_specifiers (tree, const char *, int, int, int, int,
73 static void check_for_uninitialized_const_var (tree);
74 static hashval_t typename_hash (const void *);
75 static int typename_compare (const void *, const void *);
76 static tree local_variable_p_walkfn (tree *, int *, void *);
77 static tree record_builtin_java_type (const char *, int);
78 static const char *tag_name (enum tag_types);
79 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
80 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
81 static void maybe_deduce_size_from_array_init (tree, tree);
82 static void layout_var_decl (tree);
83 static void maybe_commonize_var (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 /* States indicating how grokdeclarator() should handle declspecs marked
230 with __attribute__((deprecated)). An object declared as
231 __attribute__((deprecated)) suppresses warnings of uses of other
234 enum deprecated_states {
239 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
242 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
243 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
244 time the VAR_DECL was declared, the type was incomplete. */
246 static GTY(()) tree incomplete_vars;
248 /* Returns the kind of template specialization we are currently
249 processing, given that it's declaration contained N_CLASS_SCOPES
250 explicit scope qualifications. */
253 current_tmpl_spec_kind (int n_class_scopes)
255 int n_template_parm_scopes = 0;
256 int seen_specialization_p = 0;
257 int innermost_specialization_p = 0;
258 struct cp_binding_level *b;
260 /* Scan through the template parameter scopes. */
261 for (b = current_binding_level;
262 b->kind == sk_template_parms;
265 /* If we see a specialization scope inside a parameter scope,
266 then something is wrong. That corresponds to a declaration
269 template <class T> template <> ...
271 which is always invalid since [temp.expl.spec] forbids the
272 specialization of a class member template if the enclosing
273 class templates are not explicitly specialized as well. */
274 if (b->explicit_spec_p)
276 if (n_template_parm_scopes == 0)
277 innermost_specialization_p = 1;
279 seen_specialization_p = 1;
281 else if (seen_specialization_p == 1)
282 return tsk_invalid_member_spec;
284 ++n_template_parm_scopes;
287 /* Handle explicit instantiations. */
288 if (processing_explicit_instantiation)
290 if (n_template_parm_scopes != 0)
291 /* We've seen a template parameter list during an explicit
292 instantiation. For example:
294 template <class T> template void f(int);
296 This is erroneous. */
297 return tsk_invalid_expl_inst;
299 return tsk_expl_inst;
302 if (n_template_parm_scopes < n_class_scopes)
303 /* We've not seen enough template headers to match all the
304 specialized classes present. For example:
306 template <class T> void R<T>::S<T>::f(int);
308 This is invalid; there needs to be one set of template
309 parameters for each class. */
310 return tsk_insufficient_parms;
311 else if (n_template_parm_scopes == n_class_scopes)
312 /* We're processing a non-template declaration (even though it may
313 be a member of a template class.) For example:
315 template <class T> void S<T>::f(int);
317 The `class T' maches the `S<T>', leaving no template headers
318 corresponding to the `f'. */
320 else if (n_template_parm_scopes > n_class_scopes + 1)
321 /* We've got too many template headers. For example:
323 template <> template <class T> void f (T);
325 There need to be more enclosing classes. */
326 return tsk_excessive_parms;
328 /* This must be a template. It's of the form:
330 template <class T> template <class U> void S<T>::f(U);
332 This is a specialization if the innermost level was a
333 specialization; otherwise it's just a definition of the
335 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
338 /* Exit the current scope. */
346 /* When a label goes out of scope, check to see if that label was used
347 in a valid manner, and issue any appropriate warnings or errors. */
350 pop_label (tree label, tree old_value)
352 if (!processing_template_decl)
354 if (DECL_INITIAL (label) == NULL_TREE)
358 error ("label %q+D used but not defined", label);
359 #ifdef USE_MAPPED_LOCATION
360 location = input_location; /* FIXME want (input_filename, (line)0) */
362 location.file = input_filename;
365 /* Avoid crashing later. */
366 define_label (location, DECL_NAME (label));
369 warn_for_unused_label (label);
372 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
375 /* At the end of a function, all labels declared within the function
376 go out of scope. BLOCK is the top-level block for the
380 pop_labels_1 (void **slot, void *data)
382 struct named_label_entry *ent = (struct named_label_entry *) *slot;
383 tree block = (tree) data;
385 pop_label (ent->label_decl, NULL_TREE);
387 /* Put the labels into the "variables" of the top-level block,
388 so debugger can see them. */
389 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
390 BLOCK_VARS (block) = ent->label_decl;
392 htab_clear_slot (named_labels, slot);
398 pop_labels (tree block)
402 htab_traverse (named_labels, pop_labels_1, block);
407 /* At the end of a block with local labels, restore the outer definition. */
410 pop_local_label (tree label, tree old_value)
412 struct named_label_entry dummy;
415 pop_label (label, old_value);
417 dummy.label_decl = label;
418 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
419 htab_clear_slot (named_labels, slot);
422 /* The following two routines are used to interface to Objective-C++.
423 The binding level is purposely treated as an opaque type. */
426 objc_get_current_scope (void)
428 return current_binding_level;
431 /* The following routine is used by the NeXT-style SJLJ exceptions;
432 variables get marked 'volatile' so as to not be clobbered by
433 _setjmp()/_longjmp() calls. All variables in the current scope,
434 as well as parent scopes up to (but not including) ENCLOSING_BLK
435 shall be thusly marked. */
438 objc_mark_locals_volatile (void *enclosing_blk)
440 struct cp_binding_level *scope;
442 for (scope = current_binding_level;
443 scope && scope != enclosing_blk;
444 scope = scope->level_chain)
448 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
449 objc_volatilize_decl (decl);
451 /* Do not climb up past the current function. */
452 if (scope->kind == sk_function_parms)
457 /* Update data for defined and undefined labels when leaving a scope. */
460 poplevel_named_label_1 (void **slot, void *data)
462 struct named_label_entry *ent = (struct named_label_entry *) *slot;
463 struct cp_binding_level *bl = (struct cp_binding_level *) data;
464 struct cp_binding_level *obl = bl->level_chain;
466 if (ent->binding_level == bl)
470 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
471 if (decl_jump_unsafe (decl))
472 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
474 ent->binding_level = obl;
475 ent->names_in_scope = obl->names;
479 ent->in_try_scope = true;
482 ent->in_catch_scope = true;
485 ent->in_omp_scope = true;
493 struct named_label_use_entry *use;
495 for (use = ent->uses; use ; use = use->next)
496 if (use->binding_level == bl)
498 use->binding_level = obl;
499 use->names_in_scope = obl->names;
500 if (bl->kind == sk_omp)
501 use->in_omp_scope = true;
508 /* Exit a binding level.
509 Pop the level off, and restore the state of the identifier-decl mappings
510 that were in effect when this level was entered.
512 If KEEP == 1, this level had explicit declarations, so
513 and create a "block" (a BLOCK node) for the level
514 to record its declarations and subblocks for symbol table output.
516 If FUNCTIONBODY is nonzero, this level is the body of a function,
517 so create a block as if KEEP were set and also clear out all
520 If REVERSE is nonzero, reverse the order of decls before putting
521 them into the BLOCK. */
524 poplevel (int keep, int reverse, int functionbody)
527 /* The chain of decls was accumulated in reverse order.
528 Put it into forward order, just for cleanliness. */
530 int tmp = functionbody;
531 int real_functionbody;
535 int leaving_for_scope;
538 timevar_push (TV_NAME_LOOKUP);
543 gcc_assert (current_binding_level->kind != sk_class);
545 real_functionbody = (current_binding_level->kind == sk_cleanup
546 ? ((functionbody = 0), tmp) : functionbody);
547 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
549 gcc_assert (!VEC_length(cp_class_binding,
550 current_binding_level->class_shadowed));
552 /* We used to use KEEP == 2 to indicate that the new block should go
553 at the beginning of the list of blocks at this binding level,
554 rather than the end. This hack is no longer used. */
555 gcc_assert (keep == 0 || keep == 1);
557 if (current_binding_level->keep)
560 /* Any uses of undefined labels, and any defined labels, now operate
561 under constraints of next binding contour. */
562 if (cfun && !functionbody && named_labels)
563 htab_traverse (named_labels, poplevel_named_label_1,
564 current_binding_level);
566 /* Get the decls in the order they were written.
567 Usually current_binding_level->names is in reverse order.
568 But parameter decls were previously put in forward order. */
571 current_binding_level->names
572 = decls = nreverse (current_binding_level->names);
574 decls = current_binding_level->names;
576 /* If there were any declarations or structure tags in that level,
577 or if this level is a function body,
578 create a BLOCK to record them for the life of this function. */
580 if (keep == 1 || functionbody)
581 block = make_node (BLOCK);
582 if (block != NULL_TREE)
584 BLOCK_VARS (block) = decls;
585 BLOCK_SUBBLOCKS (block) = subblocks;
588 /* In each subblock, record that this is its superior. */
590 for (link = subblocks; link; link = TREE_CHAIN (link))
591 BLOCK_SUPERCONTEXT (link) = block;
593 /* We still support the old for-scope rules, whereby the variables
594 in a for-init statement were in scope after the for-statement
595 ended. We only use the new rules if flag_new_for_scope is
598 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
600 /* Before we remove the declarations first check for unused variables. */
601 if (warn_unused_variable
602 && !processing_template_decl)
603 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
604 if (TREE_CODE (decl) == VAR_DECL
605 && ! TREE_USED (decl)
606 && ! DECL_IN_SYSTEM_HEADER (decl)
607 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
608 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
610 /* Remove declarations for all the DECLs in this level. */
611 for (link = decls; link; link = TREE_CHAIN (link))
613 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
616 tree name = DECL_NAME (link);
620 ob = outer_binding (name,
621 IDENTIFIER_BINDING (name),
624 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
626 ns_binding = NULL_TREE;
628 if (ob && ob->scope == current_binding_level->level_chain)
629 /* We have something like:
634 and we are leaving the `for' scope. There's no reason to
635 keep the binding of the inner `i' in this case. */
636 pop_binding (name, link);
637 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
638 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
639 /* Here, we have something like:
647 We must pop the for-scope binding so we know what's a
648 type and what isn't. */
649 pop_binding (name, link);
652 /* Mark this VAR_DECL as dead so that we can tell we left it
653 there only for backward compatibility. */
654 DECL_DEAD_FOR_LOCAL (link) = 1;
656 /* Keep track of what should have happened when we
657 popped the binding. */
660 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
661 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
664 /* Add it to the list of dead variables in the next
665 outermost binding to that we can remove these when we
666 leave that binding. */
667 current_binding_level->level_chain->dead_vars_from_for
668 = tree_cons (NULL_TREE, link,
669 current_binding_level->level_chain->
672 /* Although we don't pop the cxx_binding, we do clear
673 its SCOPE since the scope is going away now. */
674 IDENTIFIER_BINDING (name)->scope
675 = current_binding_level->level_chain;
682 /* Remove the binding. */
685 if (TREE_CODE (decl) == TREE_LIST)
686 decl = TREE_VALUE (decl);
689 if (TREE_CODE (name) == OVERLOAD)
690 name = OVL_FUNCTION (name);
692 gcc_assert (DECL_P (name));
693 pop_binding (DECL_NAME (name), decl);
697 /* Remove declarations for any `for' variables from inner scopes
698 that we kept around. */
699 for (link = current_binding_level->dead_vars_from_for;
700 link; link = TREE_CHAIN (link))
701 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
703 /* Restore the IDENTIFIER_TYPE_VALUEs. */
704 for (link = current_binding_level->type_shadowed;
705 link; link = TREE_CHAIN (link))
706 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
708 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
709 for (link = current_binding_level->shadowed_labels;
711 link = TREE_CHAIN (link))
712 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
714 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
715 list if a `using' declaration put them there. The debugging
716 back ends won't understand OVERLOAD, so we remove them here.
717 Because the BLOCK_VARS are (temporarily) shared with
718 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
719 popped all the bindings. */
724 for (d = &BLOCK_VARS (block); *d; )
726 if (TREE_CODE (*d) == TREE_LIST)
727 *d = TREE_CHAIN (*d);
729 d = &TREE_CHAIN (*d);
733 /* If the level being exited is the top level of a function,
734 check over all the labels. */
737 /* Since this is the top level block of a function, the vars are
738 the function's parameters. Don't leave them in the BLOCK
739 because they are found in the FUNCTION_DECL instead. */
740 BLOCK_VARS (block) = 0;
744 kind = current_binding_level->kind;
745 if (kind == sk_cleanup)
749 /* If this is a temporary binding created for a cleanup, then we'll
750 have pushed a statement list level. Pop that, create a new
751 BIND_EXPR for the block, and insert it into the stream. */
752 stmt = pop_stmt_list (current_binding_level->statement_list);
753 stmt = c_build_bind_expr (block, stmt);
760 /* The current function is being defined, so its DECL_INITIAL
761 should be error_mark_node. */
762 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
763 DECL_INITIAL (current_function_decl) = block;
766 current_binding_level->blocks
767 = chainon (current_binding_level->blocks, block);
769 /* If we did not make a block for the level just exited,
770 any blocks made for inner levels
771 (since they cannot be recorded as subblocks in that level)
772 must be carried forward so they will later become subblocks
773 of something else. */
775 current_binding_level->blocks
776 = chainon (current_binding_level->blocks, subblocks);
778 /* Each and every BLOCK node created here in `poplevel' is important
779 (e.g. for proper debugging information) so if we created one
780 earlier, mark it as "used". */
782 TREE_USED (block) = 1;
784 /* All temporary bindings created for cleanups are popped silently. */
785 if (kind == sk_cleanup)
788 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
791 /* Insert BLOCK at the end of the list of subblocks of the
792 current binding level. This is used when a BIND_EXPR is expanded,
793 to handle the BLOCK node inside the BIND_EXPR. */
796 insert_block (tree block)
798 TREE_USED (block) = 1;
799 current_binding_level->blocks
800 = chainon (current_binding_level->blocks, block);
803 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
804 itself, calling F for each. The DATA is passed to F as well. */
807 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
810 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
812 result |= (*f) (namespace, data);
814 for (; current; current = TREE_CHAIN (current))
815 result |= walk_namespaces_r (current, f, data);
820 /* Walk all the namespaces, calling F for each. The DATA is passed to
824 walk_namespaces (walk_namespaces_fn f, void* data)
826 return walk_namespaces_r (global_namespace, f, data);
829 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
830 DATA is non-NULL, this is the last time we will call
831 wrapup_global_declarations for this NAMESPACE. */
834 wrapup_globals_for_namespace (tree namespace, void* data)
836 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
837 VEC(tree,gc) *statics = level->static_decls;
838 tree *vec = VEC_address (tree, statics);
839 int len = VEC_length (tree, statics);
840 int last_time = (data != 0);
844 check_global_declarations (vec, len);
845 emit_debug_global_declarations (vec, len);
849 /* Write out any globals that need to be output. */
850 return wrapup_global_declarations (vec, len);
854 /* In C++, you don't have to write `struct S' to refer to `S'; you
855 can just use `S'. We accomplish this by creating a TYPE_DECL as
856 if the user had written `typedef struct S S'. Create and return
857 the TYPE_DECL for TYPE. */
860 create_implicit_typedef (tree name, tree type)
864 decl = build_decl (TYPE_DECL, name, type);
865 DECL_ARTIFICIAL (decl) = 1;
866 /* There are other implicit type declarations, like the one *within*
867 a class that allows you to write `S::S'. We must distinguish
869 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
870 TYPE_NAME (type) = decl;
875 /* Remember a local name for name-mangling purposes. */
878 push_local_name (tree decl)
883 timevar_push (TV_NAME_LOOKUP);
885 name = DECL_NAME (decl);
887 nelts = VEC_length (tree, local_names);
888 for (i = 0; i < nelts; i++)
890 t = VEC_index (tree, local_names, i);
891 if (DECL_NAME (t) == name)
893 if (!DECL_LANG_SPECIFIC (decl))
894 retrofit_lang_decl (decl);
895 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
896 if (DECL_LANG_SPECIFIC (t))
897 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
899 DECL_DISCRIMINATOR (decl) = 1;
901 VEC_replace (tree, local_names, i, decl);
902 timevar_pop (TV_NAME_LOOKUP);
907 VEC_safe_push (tree, gc, local_names, decl);
908 timevar_pop (TV_NAME_LOOKUP);
911 /* Subroutine of duplicate_decls: return truthvalue of whether
912 or not types of these decls match.
914 For C++, we must compare the parameter list so that `int' can match
915 `int&' in a parameter position, but `int&' is not confused with
919 decls_match (tree newdecl, tree olddecl)
923 if (newdecl == olddecl)
926 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
927 /* If the two DECLs are not even the same kind of thing, we're not
928 interested in their types. */
931 if (TREE_CODE (newdecl) == FUNCTION_DECL)
933 tree f1 = TREE_TYPE (newdecl);
934 tree f2 = TREE_TYPE (olddecl);
935 tree p1 = TYPE_ARG_TYPES (f1);
936 tree p2 = TYPE_ARG_TYPES (f2);
938 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
939 && ! (DECL_EXTERN_C_P (newdecl)
940 && DECL_EXTERN_C_P (olddecl)))
943 if (TREE_CODE (f1) != TREE_CODE (f2))
946 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
948 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
949 && (DECL_BUILT_IN (olddecl)
950 #ifndef NO_IMPLICIT_EXTERN_C
951 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
952 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
956 types_match = self_promoting_args_p (p1);
957 if (p1 == void_list_node)
958 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
960 #ifndef NO_IMPLICIT_EXTERN_C
961 else if (p1 == NULL_TREE
962 && (DECL_EXTERN_C_P (olddecl)
963 && DECL_IN_SYSTEM_HEADER (olddecl)
964 && !DECL_CLASS_SCOPE_P (olddecl))
965 && (DECL_EXTERN_C_P (newdecl)
966 && DECL_IN_SYSTEM_HEADER (newdecl)
967 && !DECL_CLASS_SCOPE_P (newdecl)))
969 types_match = self_promoting_args_p (p2);
970 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
974 types_match = compparms (p1, p2);
979 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
981 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
982 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
985 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
986 DECL_TEMPLATE_PARMS (olddecl)))
989 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
990 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
991 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
993 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
994 DECL_TEMPLATE_RESULT (newdecl));
998 /* Need to check scope for variable declaration (VAR_DECL).
999 For typedef (TYPE_DECL), scope is ignored. */
1000 if (TREE_CODE (newdecl) == VAR_DECL
1001 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1003 Two declarations for an object with C language linkage
1004 with the same name (ignoring the namespace that qualify
1005 it) that appear in different namespace scopes refer to
1007 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1010 if (TREE_TYPE (newdecl) == error_mark_node)
1011 types_match = TREE_TYPE (olddecl) == error_mark_node;
1012 else if (TREE_TYPE (olddecl) == NULL_TREE)
1013 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1014 else if (TREE_TYPE (newdecl) == NULL_TREE)
1017 types_match = comptypes (TREE_TYPE (newdecl),
1018 TREE_TYPE (olddecl),
1019 COMPARE_REDECLARATION);
1025 /* If NEWDECL is `static' and an `extern' was seen previously,
1026 warn about it. OLDDECL is the previous declaration.
1028 Note that this does not apply to the C++ case of declaring
1029 a variable `extern const' and then later `const'.
1031 Don't complain about built-in functions, since they are beyond
1032 the user's control. */
1035 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1039 if (TREE_CODE (newdecl) == TYPE_DECL
1040 || TREE_CODE (newdecl) == TEMPLATE_DECL
1041 || TREE_CODE (newdecl) == CONST_DECL
1042 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1045 /* Don't get confused by static member functions; that's a different
1047 if (TREE_CODE (newdecl) == FUNCTION_DECL
1048 && DECL_STATIC_FUNCTION_P (newdecl))
1051 /* If the old declaration was `static', or the new one isn't, then
1052 then everything is OK. */
1053 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1056 /* It's OK to declare a builtin function as `static'. */
1057 if (TREE_CODE (olddecl) == FUNCTION_DECL
1058 && DECL_ARTIFICIAL (olddecl))
1061 name = DECL_ASSEMBLER_NAME (newdecl);
1062 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1063 pedwarn ("previous declaration of %q+D", olddecl);
1066 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1067 function templates. If their exception specifications do not
1068 match, issue a diagnostic. */
1071 check_redeclaration_exception_specification (tree new_decl,
1076 tree new_exceptions;
1077 tree old_exceptions;
1079 new_type = TREE_TYPE (new_decl);
1080 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1081 old_type = TREE_TYPE (old_decl);
1082 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1086 If any declaration of a function has an exception-specification,
1087 all declarations, including the definition and an explicit
1088 specialization, of that function shall have an
1089 exception-specification with the same set of type-ids. */
1090 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1091 && ! DECL_IS_BUILTIN (old_decl)
1093 && !comp_except_specs (new_exceptions, old_exceptions,
1096 error ("declaration of %qF throws different exceptions", new_decl);
1097 error ("from previous declaration %q+F", old_decl);
1101 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1102 If the redeclaration is invalid, a diagnostic is issued, and the
1103 error_mark_node is returned. Otherwise, OLDDECL is returned.
1105 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1108 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1111 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1113 unsigned olddecl_uid = DECL_UID (olddecl);
1114 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1115 int new_defines_function = 0;
1118 if (newdecl == olddecl)
1121 types_match = decls_match (newdecl, olddecl);
1123 /* If either the type of the new decl or the type of the old decl is an
1124 error_mark_node, then that implies that we have already issued an
1125 error (earlier) for some bogus type specification, and in that case,
1126 it is rather pointless to harass the user with yet more error message
1127 about the same declaration, so just pretend the types match here. */
1128 if (TREE_TYPE (newdecl) == error_mark_node
1129 || TREE_TYPE (olddecl) == error_mark_node)
1130 return error_mark_node;
1132 if (DECL_P (olddecl)
1133 && TREE_CODE (newdecl) == FUNCTION_DECL
1134 && TREE_CODE (olddecl) == FUNCTION_DECL
1135 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1137 if (DECL_DECLARED_INLINE_P (newdecl)
1138 && DECL_UNINLINABLE (newdecl)
1139 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1140 /* Already warned elsewhere. */;
1141 else if (DECL_DECLARED_INLINE_P (olddecl)
1142 && DECL_UNINLINABLE (olddecl)
1143 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1144 /* Already warned. */;
1145 else if (DECL_DECLARED_INLINE_P (newdecl)
1146 && DECL_UNINLINABLE (olddecl)
1147 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1149 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1151 warning (OPT_Wattributes, "previous declaration of %q+D "
1152 "with attribute noinline", olddecl);
1154 else if (DECL_DECLARED_INLINE_P (olddecl)
1155 && DECL_UNINLINABLE (newdecl)
1156 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1158 warning (OPT_Wattributes, "function %q+D redeclared with "
1159 "attribute noinline", newdecl);
1160 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1165 /* Check for redeclaration and other discrepancies. */
1166 if (TREE_CODE (olddecl) == FUNCTION_DECL
1167 && DECL_ARTIFICIAL (olddecl))
1169 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1170 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1172 /* Avoid warnings redeclaring built-ins which have not been
1173 explicitly declared. */
1174 if (DECL_ANTICIPATED (olddecl))
1177 /* If you declare a built-in or predefined function name as static,
1178 the old definition is overridden, but optionally warn this was a
1179 bad choice of name. */
1180 if (! TREE_PUBLIC (newdecl))
1182 warning (OPT_Wshadow, "shadowing %s function %q#D",
1183 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1185 /* Discard the old built-in function. */
1188 /* If the built-in is not ansi, then programs can override
1189 it even globally without an error. */
1190 else if (! DECL_BUILT_IN (olddecl))
1191 warning (0, "library function %q#D redeclared as non-function %q#D",
1195 error ("declaration of %q#D", newdecl);
1196 error ("conflicts with built-in declaration %q#D",
1201 else if (!types_match)
1203 /* Avoid warnings redeclaring built-ins which have not been
1204 explicitly declared. */
1205 if (DECL_ANTICIPATED (olddecl))
1207 /* Deal with fileptr_type_node. FILE type is not known
1208 at the time we create the builtins. */
1211 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1212 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1214 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1217 else if (TREE_VALUE (t2) == fileptr_type_node)
1219 tree t = TREE_VALUE (t1);
1221 if (TREE_CODE (t) == POINTER_TYPE
1222 && TYPE_NAME (TREE_TYPE (t))
1223 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1224 == get_identifier ("FILE")
1225 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1227 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1229 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1230 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1231 types_match = decls_match (newdecl, olddecl);
1233 return duplicate_decls (newdecl, olddecl,
1235 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1238 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1241 else if ((DECL_EXTERN_C_P (newdecl)
1242 && DECL_EXTERN_C_P (olddecl))
1243 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1244 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1246 /* A near match; override the builtin. */
1248 if (TREE_PUBLIC (newdecl))
1250 warning (0, "new declaration %q#D", newdecl);
1251 warning (0, "ambiguates built-in declaration %q#D",
1255 warning (OPT_Wshadow, "shadowing %s function %q#D",
1256 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1260 /* Discard the old built-in function. */
1263 /* Replace the old RTL to avoid problems with inlining. */
1264 COPY_DECL_RTL (newdecl, olddecl);
1266 /* Even if the types match, prefer the new declarations type for
1267 built-ins which have not been explicitly declared, for
1268 exception lists, etc... */
1269 else if (DECL_ANTICIPATED (olddecl))
1271 tree type = TREE_TYPE (newdecl);
1272 tree attribs = (*targetm.merge_type_attributes)
1273 (TREE_TYPE (olddecl), type);
1275 type = cp_build_type_attribute_variant (type, attribs);
1276 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1279 /* Whether or not the builtin can throw exceptions has no
1280 bearing on this declarator. */
1281 TREE_NOTHROW (olddecl) = 0;
1283 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1285 /* If a builtin function is redeclared as `static', merge
1286 the declarations, but make the original one static. */
1287 DECL_THIS_STATIC (olddecl) = 1;
1288 TREE_PUBLIC (olddecl) = 0;
1290 /* Make the old declaration consistent with the new one so
1291 that all remnants of the builtin-ness of this function
1292 will be banished. */
1293 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1294 COPY_DECL_RTL (newdecl, olddecl);
1297 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1299 /* C++ Standard, 3.3, clause 4:
1300 "[Note: a namespace name or a class template name must be unique
1301 in its declarative region (7.3.2, clause 14). ]" */
1302 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1303 && TREE_CODE (newdecl) != NAMESPACE_DECL
1304 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1305 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1306 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1307 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1309 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1310 && TREE_CODE (newdecl) != TYPE_DECL)
1311 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1312 && TREE_CODE (olddecl) != TYPE_DECL))
1314 /* We do nothing special here, because C++ does such nasty
1315 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1316 get shadowed, and know that if we need to find a TYPE_DECL
1317 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1318 slot of the identifier. */
1322 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1323 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1324 || (TREE_CODE (olddecl) == FUNCTION_DECL
1325 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1329 error ("%q#D redeclared as different kind of symbol", newdecl);
1330 if (TREE_CODE (olddecl) == TREE_LIST)
1331 olddecl = TREE_VALUE (olddecl);
1332 error ("previous declaration of %q+#D", olddecl);
1334 return error_mark_node;
1336 else if (!types_match)
1338 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1339 /* These are certainly not duplicate declarations; they're
1340 from different scopes. */
1343 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1345 /* The name of a class template may not be declared to refer to
1346 any other template, class, function, object, namespace, value,
1347 or type in the same scope. */
1348 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1349 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1351 error ("declaration of template %q#D", newdecl);
1352 error ("conflicts with previous declaration %q+#D", olddecl);
1354 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1355 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1356 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1357 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1358 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1359 DECL_TEMPLATE_PARMS (olddecl))
1360 /* Template functions can be disambiguated by
1362 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1363 TREE_TYPE (TREE_TYPE (olddecl))))
1365 error ("new declaration %q#D", newdecl);
1366 error ("ambiguates old declaration %q+#D", olddecl);
1370 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1372 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1374 error ("declaration of C function %q#D conflicts with",
1376 error ("previous declaration %q+#D here", olddecl);
1378 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1379 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1381 error ("new declaration %q#D", newdecl);
1382 error ("ambiguates old declaration %q+#D", olddecl);
1383 return error_mark_node;
1390 error ("conflicting declaration %q#D", newdecl);
1391 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1392 return error_mark_node;
1395 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1396 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1397 && (!DECL_TEMPLATE_INFO (newdecl)
1398 || (DECL_TI_TEMPLATE (newdecl)
1399 != DECL_TI_TEMPLATE (olddecl))))
1400 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1401 && (!DECL_TEMPLATE_INFO (olddecl)
1402 || (DECL_TI_TEMPLATE (olddecl)
1403 != DECL_TI_TEMPLATE (newdecl))))))
1404 /* It's OK to have a template specialization and a non-template
1405 with the same type, or to have specializations of two
1406 different templates with the same type. Note that if one is a
1407 specialization, and the other is an instantiation of the same
1408 template, that we do not exit at this point. That situation
1409 can occur if we instantiate a template class, and then
1410 specialize one of its methods. This situation is valid, but
1411 the declarations must be merged in the usual way. */
1413 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1414 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1415 && !DECL_USE_TEMPLATE (newdecl))
1416 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1417 && !DECL_USE_TEMPLATE (olddecl))))
1418 /* One of the declarations is a template instantiation, and the
1419 other is not a template at all. That's OK. */
1421 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1423 /* In [namespace.alias] we have:
1425 In a declarative region, a namespace-alias-definition can be
1426 used to redefine a namespace-alias declared in that declarative
1427 region to refer only to the namespace to which it already
1430 Therefore, if we encounter a second alias directive for the same
1431 alias, we can just ignore the second directive. */
1432 if (DECL_NAMESPACE_ALIAS (newdecl)
1433 && (DECL_NAMESPACE_ALIAS (newdecl)
1434 == DECL_NAMESPACE_ALIAS (olddecl)))
1436 /* [namespace.alias]
1438 A namespace-name or namespace-alias shall not be declared as
1439 the name of any other entity in the same declarative region.
1440 A namespace-name defined at global scope shall not be
1441 declared as the name of any other entity in any global scope
1443 error ("declaration of namespace %qD conflicts with", newdecl);
1444 error ("previous declaration of namespace %q+D here", olddecl);
1445 return error_mark_node;
1449 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1452 error (errmsg, newdecl);
1453 if (DECL_NAME (olddecl) != NULL_TREE)
1454 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1455 ? "%q+#D previously defined here"
1456 : "%q+#D previously declared here", olddecl);
1457 return error_mark_node;
1459 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1460 && DECL_INITIAL (olddecl) != NULL_TREE
1461 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1462 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1464 /* Prototype decl follows defn w/o prototype. */
1465 warning (0, "prototype for %q+#D", newdecl);
1466 warning (0, "%Jfollows non-prototype definition here", olddecl);
1468 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1469 || TREE_CODE (olddecl) == VAR_DECL)
1470 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1473 If two declarations of the same function or object
1474 specify different linkage-specifications ..., the program
1475 is ill-formed.... Except for functions with C++ linkage,
1476 a function declaration without a linkage specification
1477 shall not precede the first linkage specification for
1478 that function. A function can be declared without a
1479 linkage specification after an explicit linkage
1480 specification has been seen; the linkage explicitly
1481 specified in the earlier declaration is not affected by
1482 such a function declaration.
1484 DR 563 raises the question why the restrictions on
1485 functions should not also apply to objects. Older
1486 versions of G++ silently ignore the linkage-specification
1494 which is clearly wrong. Therefore, we now treat objects
1496 if (current_lang_depth () == 0)
1498 /* There is no explicit linkage-specification, so we use
1499 the linkage from the previous declaration. */
1500 if (!DECL_LANG_SPECIFIC (newdecl))
1501 retrofit_lang_decl (newdecl);
1502 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1506 error ("previous declaration of %q+#D with %qL linkage",
1507 olddecl, DECL_LANGUAGE (olddecl));
1508 error ("conflicts with new declaration with %qL linkage",
1509 DECL_LANGUAGE (newdecl));
1513 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1515 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1517 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1518 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1521 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1522 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1524 for (; t1 && t1 != void_list_node;
1525 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1526 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1528 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1531 pedwarn ("default argument given for parameter %d of %q#D",
1533 pedwarn ("after previous specification in %q+#D", olddecl);
1537 error ("default argument given for parameter %d of %q#D",
1539 error ("after previous specification in %q+#D",
1544 if (DECL_DECLARED_INLINE_P (newdecl)
1545 && ! DECL_DECLARED_INLINE_P (olddecl)
1546 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1548 warning (0, "%q#D was used before it was declared inline", newdecl);
1549 warning (0, "%Jprevious non-inline declaration here", olddecl);
1554 /* Do not merge an implicit typedef with an explicit one. In:
1558 typedef class A A __attribute__ ((foo));
1560 the attribute should apply only to the typedef. */
1561 if (TREE_CODE (olddecl) == TYPE_DECL
1562 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1563 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1566 /* If new decl is `static' and an `extern' was seen previously,
1568 warn_extern_redeclared_static (newdecl, olddecl);
1570 /* We have committed to returning 1 at this point. */
1571 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1573 /* Now that functions must hold information normally held
1574 by field decls, there is extra work to do so that
1575 declaration information does not get destroyed during
1577 if (DECL_VINDEX (olddecl))
1578 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1579 if (DECL_CONTEXT (olddecl))
1580 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1581 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1582 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1583 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1584 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1585 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1586 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1587 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1588 SET_OVERLOADED_OPERATOR_CODE
1589 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1590 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1592 /* Optionally warn about more than one declaration for the same
1593 name, but don't warn about a function declaration followed by a
1595 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1596 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1597 /* Don't warn about extern decl followed by definition. */
1598 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1599 /* Don't warn about friends, let add_friend take care of it. */
1600 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1602 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1603 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1607 /* Deal with C++: must preserve virtual function table size. */
1608 if (TREE_CODE (olddecl) == TYPE_DECL)
1610 tree newtype = TREE_TYPE (newdecl);
1611 tree oldtype = TREE_TYPE (olddecl);
1613 if (newtype != error_mark_node && oldtype != error_mark_node
1614 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1615 CLASSTYPE_FRIEND_CLASSES (newtype)
1616 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1618 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1621 /* Copy all the DECL_... slots specified in the new decl
1622 except for any that we copy here from the old type. */
1623 DECL_ATTRIBUTES (newdecl)
1624 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1626 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1630 old_result = DECL_TEMPLATE_RESULT (olddecl);
1631 new_result = DECL_TEMPLATE_RESULT (newdecl);
1632 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1633 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1634 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1635 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1637 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1639 DECL_INLINE (old_result)
1640 |= DECL_INLINE (new_result);
1641 DECL_DECLARED_INLINE_P (old_result)
1642 |= DECL_DECLARED_INLINE_P (new_result);
1643 check_redeclaration_exception_specification (newdecl, olddecl);
1646 /* If the new declaration is a definition, update the file and
1647 line information on the declaration, and also make
1648 the old declaration the same definition. */
1649 if (DECL_INITIAL (old_result) == NULL_TREE
1650 && DECL_INITIAL (new_result) != NULL_TREE)
1652 DECL_SOURCE_LOCATION (olddecl)
1653 = DECL_SOURCE_LOCATION (old_result)
1654 = DECL_SOURCE_LOCATION (newdecl);
1655 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1656 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1657 DECL_ARGUMENTS (old_result)
1658 = DECL_ARGUMENTS (new_result);
1666 /* Automatically handles default parameters. */
1667 tree oldtype = TREE_TYPE (olddecl);
1670 /* Merge the data types specified in the two decls. */
1671 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1673 /* If merge_types produces a non-typedef type, just use the old type. */
1674 if (TREE_CODE (newdecl) == TYPE_DECL
1675 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1678 if (TREE_CODE (newdecl) == VAR_DECL)
1680 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1681 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1682 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1683 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1684 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1685 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1687 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1688 if (DECL_LANG_SPECIFIC (olddecl)
1689 && CP_DECL_THREADPRIVATE_P (olddecl))
1691 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1692 if (!DECL_LANG_SPECIFIC (newdecl))
1693 retrofit_lang_decl (newdecl);
1695 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1696 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1700 /* Do this after calling `merge_types' so that default
1701 parameters don't confuse us. */
1702 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1703 check_redeclaration_exception_specification (newdecl, olddecl);
1704 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1706 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1707 check_default_args (newdecl);
1709 /* Lay the type out, unless already done. */
1710 if (! same_type_p (newtype, oldtype)
1711 && TREE_TYPE (newdecl) != error_mark_node
1712 && !(processing_template_decl && uses_template_parms (newdecl)))
1713 layout_type (TREE_TYPE (newdecl));
1715 if ((TREE_CODE (newdecl) == VAR_DECL
1716 || TREE_CODE (newdecl) == PARM_DECL
1717 || TREE_CODE (newdecl) == RESULT_DECL
1718 || TREE_CODE (newdecl) == FIELD_DECL
1719 || TREE_CODE (newdecl) == TYPE_DECL)
1720 && !(processing_template_decl && uses_template_parms (newdecl)))
1721 layout_decl (newdecl, 0);
1723 /* Merge the type qualifiers. */
1724 if (TREE_READONLY (newdecl))
1725 TREE_READONLY (olddecl) = 1;
1726 if (TREE_THIS_VOLATILE (newdecl))
1727 TREE_THIS_VOLATILE (olddecl) = 1;
1728 if (TREE_NOTHROW (newdecl))
1729 TREE_NOTHROW (olddecl) = 1;
1731 /* Merge deprecatedness. */
1732 if (TREE_DEPRECATED (newdecl))
1733 TREE_DEPRECATED (olddecl) = 1;
1735 /* Merge the initialization information. */
1736 if (DECL_INITIAL (newdecl) == NULL_TREE
1737 && DECL_INITIAL (olddecl) != NULL_TREE)
1739 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1740 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1741 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1742 && DECL_LANG_SPECIFIC (newdecl)
1743 && DECL_LANG_SPECIFIC (olddecl))
1745 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1746 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1750 /* Merge the section attribute.
1751 We want to issue an error if the sections conflict but that must be
1752 done later in decl_attributes since we are called before attributes
1754 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1755 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1757 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1759 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1760 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1761 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1762 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1763 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1764 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1765 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1766 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1767 /* Keep the old RTL. */
1768 COPY_DECL_RTL (olddecl, newdecl);
1770 else if (TREE_CODE (newdecl) == VAR_DECL
1771 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1773 /* Keep the old RTL. We cannot keep the old RTL if the old
1774 declaration was for an incomplete object and the new
1775 declaration is not since many attributes of the RTL will
1777 COPY_DECL_RTL (olddecl, newdecl);
1780 /* If cannot merge, then use the new type and qualifiers,
1781 and don't preserve the old rtl. */
1784 /* Clean out any memory we had of the old declaration. */
1785 tree oldstatic = value_member (olddecl, static_aggregates);
1787 TREE_VALUE (oldstatic) = error_mark_node;
1789 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1790 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1791 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1792 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1795 /* Merge the storage class information. */
1796 merge_weak (newdecl, olddecl);
1798 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1799 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1800 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1801 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1802 if (! DECL_EXTERNAL (olddecl))
1803 DECL_EXTERNAL (newdecl) = 0;
1805 new_template = NULL_TREE;
1806 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1808 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1809 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1810 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1811 DECL_TEMPLATE_INSTANTIATED (newdecl)
1812 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1814 /* If the OLDDECL is an instantiation and/or specialization,
1815 then the NEWDECL must be too. But, it may not yet be marked
1816 as such if the caller has created NEWDECL, but has not yet
1817 figured out that it is a redeclaration. */
1818 if (!DECL_USE_TEMPLATE (newdecl))
1819 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1821 /* Don't really know how much of the language-specific
1822 values we should copy from old to new. */
1823 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1824 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1825 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1826 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1827 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1828 if (DECL_TEMPLATE_INFO (newdecl))
1829 new_template = DECL_TI_TEMPLATE (newdecl);
1830 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1831 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1832 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1833 olddecl_friend = DECL_FRIEND_P (olddecl);
1834 hidden_friend = (DECL_ANTICIPATED (olddecl)
1835 && DECL_HIDDEN_FRIEND_P (olddecl)
1836 && newdecl_is_friend);
1838 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1839 if (TREE_CODE (newdecl) == FUNCTION_DECL
1840 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1842 DECL_BEFRIENDING_CLASSES (newdecl)
1843 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1844 DECL_BEFRIENDING_CLASSES (olddecl));
1845 /* DECL_THUNKS is only valid for virtual functions,
1846 otherwise it is a DECL_FRIEND_CONTEXT. */
1847 if (DECL_VIRTUAL_P (newdecl))
1848 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1852 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1854 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1855 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1857 /* If newdecl is not a specialization, then it is not a
1858 template-related function at all. And that means that we
1859 should have exited above, returning 0. */
1860 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1862 if (TREE_USED (olddecl))
1863 /* From [temp.expl.spec]:
1865 If a template, a member template or the member of a class
1866 template is explicitly specialized then that
1867 specialization shall be declared before the first use of
1868 that specialization that would cause an implicit
1869 instantiation to take place, in every translation unit in
1870 which such a use occurs. */
1871 error ("explicit specialization of %qD after first use",
1874 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1876 /* Don't propagate visibility from the template to the
1877 specialization here. We'll do that in determine_visibility if
1879 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1881 /* [temp.expl.spec/14] We don't inline explicit specialization
1882 just because the primary template says so. */
1886 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1887 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1889 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1891 /* If either decl says `inline', this fn is inline, unless
1892 its definition was passed already. */
1893 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1894 DECL_INLINE (olddecl) = 1;
1895 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1897 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1898 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1901 /* Preserve abstractness on cloned [cd]tors. */
1902 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1906 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1907 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1908 COPY_DECL_RTL (newdecl, olddecl);
1910 if (! types_match || new_defines_function)
1912 /* These need to be copied so that the names are available.
1913 Note that if the types do match, we'll preserve inline
1914 info and other bits, but if not, we won't. */
1915 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1916 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1918 if (new_defines_function)
1919 /* If defining a function declared with other language
1920 linkage, use the previously declared language linkage. */
1921 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1922 else if (types_match)
1924 /* If redeclaring a builtin function, and not a definition,
1925 it stays built in. */
1926 if (DECL_BUILT_IN (olddecl))
1928 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1929 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1930 /* If we're keeping the built-in definition, keep the rtl,
1931 regardless of declaration matches. */
1932 COPY_DECL_RTL (olddecl, newdecl);
1935 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1936 /* Don't clear out the arguments if we're redefining a function. */
1937 if (DECL_ARGUMENTS (olddecl))
1938 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1941 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1942 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
1944 /* Now preserve various other info from the definition. */
1945 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
1946 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
1947 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1948 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1950 /* Warn about conflicting visibility specifications. */
1951 if (DECL_VISIBILITY_SPECIFIED (olddecl)
1952 && DECL_VISIBILITY_SPECIFIED (newdecl)
1953 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1955 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
1956 "because it", newdecl);
1957 warning (OPT_Wattributes, "%Jconflicts with previous "
1958 "declaration here", olddecl);
1960 /* Choose the declaration which specified visibility. */
1961 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1963 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1964 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1966 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
1967 so keep this behavior. */
1968 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
1970 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
1971 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
1974 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
1975 with that from NEWDECL below. */
1976 if (DECL_LANG_SPECIFIC (olddecl))
1978 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
1979 != DECL_LANG_SPECIFIC (newdecl));
1980 ggc_free (DECL_LANG_SPECIFIC (olddecl));
1983 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1987 function_size = sizeof (struct tree_decl_common);
1989 memcpy ((char *) olddecl + sizeof (struct tree_common),
1990 (char *) newdecl + sizeof (struct tree_common),
1991 function_size - sizeof (struct tree_common));
1993 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1994 (char *) newdecl + sizeof (struct tree_decl_common),
1995 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
1997 /* If newdecl is a template instantiation, it is possible that
1998 the following sequence of events has occurred:
2000 o A friend function was declared in a class template. The
2001 class template was instantiated.
2003 o The instantiation of the friend declaration was
2004 recorded on the instantiation list, and is newdecl.
2006 o Later, however, instantiate_class_template called pushdecl
2007 on the newdecl to perform name injection. But, pushdecl in
2008 turn called duplicate_decls when it discovered that another
2009 declaration of a global function with the same name already
2012 o Here, in duplicate_decls, we decided to clobber newdecl.
2014 If we're going to do that, we'd better make sure that
2015 olddecl, and not newdecl, is on the list of
2016 instantiations so that if we try to do the instantiation
2017 again we won't get the clobbered declaration. */
2018 reregister_specialization (newdecl,
2024 size_t size = tree_code_size (TREE_CODE (olddecl));
2025 memcpy ((char *) olddecl + sizeof (struct tree_common),
2026 (char *) newdecl + sizeof (struct tree_common),
2027 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2028 switch (TREE_CODE (olddecl))
2038 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2039 (char *) newdecl + sizeof (struct tree_decl_common),
2040 size - sizeof (struct tree_decl_common)
2041 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2045 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2046 (char *) newdecl + sizeof (struct tree_decl_common),
2047 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2048 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2052 DECL_UID (olddecl) = olddecl_uid;
2054 DECL_FRIEND_P (olddecl) = 1;
2057 DECL_ANTICIPATED (olddecl) = 1;
2058 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2061 /* NEWDECL contains the merged attribute lists.
2062 Update OLDDECL to be the same. */
2063 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2065 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2066 so that encode_section_info has a chance to look at the new decl
2067 flags and attributes. */
2068 if (DECL_RTL_SET_P (olddecl)
2069 && (TREE_CODE (olddecl) == FUNCTION_DECL
2070 || (TREE_CODE (olddecl) == VAR_DECL
2071 && TREE_STATIC (olddecl))))
2072 make_decl_rtl (olddecl);
2074 /* The NEWDECL will no longer be needed. Because every out-of-class
2075 declaration of a member results in a call to duplicate_decls,
2076 freeing these nodes represents in a significant savings. */
2082 /* Return zero if the declaration NEWDECL is valid
2083 when the declaration OLDDECL (assumed to be for the same name)
2084 has already been seen.
2085 Otherwise return an error message format string with a %s
2086 where the identifier should go. */
2089 redeclaration_error_message (tree newdecl, tree olddecl)
2091 if (TREE_CODE (newdecl) == TYPE_DECL)
2093 /* Because C++ can put things into name space for free,
2094 constructs like "typedef struct foo { ... } foo"
2095 would look like an erroneous redeclaration. */
2096 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2099 return "redefinition of %q#D";
2101 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2103 /* If this is a pure function, its olddecl will actually be
2104 the original initialization to `0' (which we force to call
2105 abort()). Don't complain about redefinition in this case. */
2106 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2107 && DECL_INITIAL (olddecl) == NULL_TREE)
2110 /* If both functions come from different namespaces, this is not
2111 a redeclaration - this is a conflict with a used function. */
2112 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2113 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2114 && ! decls_match (olddecl, newdecl))
2115 return "%qD conflicts with used function";
2117 /* We'll complain about linkage mismatches in
2118 warn_extern_redeclared_static. */
2120 /* Defining the same name twice is no good. */
2121 if (DECL_INITIAL (olddecl) != NULL_TREE
2122 && DECL_INITIAL (newdecl) != NULL_TREE)
2124 if (DECL_NAME (olddecl) == NULL_TREE)
2125 return "%q#D not declared in class";
2127 return "redefinition of %q#D";
2131 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2135 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2137 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2138 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2139 return "redefinition of %q#D";
2143 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2144 || (DECL_TEMPLATE_RESULT (newdecl)
2145 == DECL_TEMPLATE_RESULT (olddecl)))
2148 nt = DECL_TEMPLATE_RESULT (newdecl);
2149 if (DECL_TEMPLATE_INFO (nt))
2150 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2151 ot = DECL_TEMPLATE_RESULT (olddecl);
2152 if (DECL_TEMPLATE_INFO (ot))
2153 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2154 if (DECL_INITIAL (nt) && DECL_INITIAL (ot))
2155 return "redefinition of %q#D";
2157 /* Core issue #226 (C++0x):
2159 If a friend function template declaration specifies a
2160 default template-argument, that declaration shall be a
2161 definition and shall be the only declaration of the
2162 function template in the translation unit. */
2163 if ((cxx_dialect != cxx98)
2164 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2165 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2166 /*is_primary=*/1, /*is_partial=*/0,
2167 /*is_friend_decl=*/2))
2168 return "redeclaration of friend %q#D may not have default template arguments";
2172 else if (TREE_CODE (newdecl) == VAR_DECL
2173 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2174 && (! DECL_LANG_SPECIFIC (olddecl)
2175 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2176 || DECL_THREAD_LOCAL_P (newdecl)))
2178 /* Only variables can be thread-local, and all declarations must
2179 agree on this property. */
2180 if (DECL_THREAD_LOCAL_P (newdecl))
2181 return "thread-local declaration of %q#D follows "
2182 "non-thread-local declaration";
2184 return "non-thread-local declaration of %q#D follows "
2185 "thread-local declaration";
2187 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2189 /* The objects have been declared at namespace scope. If either
2190 is a member of an anonymous union, then this is an invalid
2191 redeclaration. For example:
2197 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2198 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2199 return "redeclaration of %q#D";
2200 /* If at least one declaration is a reference, there is no
2201 conflict. For example:
2207 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2209 /* Reject two definitions. */
2210 return "redefinition of %q#D";
2214 /* Objects declared with block scope: */
2215 /* Reject two definitions, and reject a definition
2216 together with an external reference. */
2217 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2218 return "redeclaration of %q#D";
2223 /* Hash and equality functions for the named_label table. */
2226 named_label_entry_hash (const void *data)
2228 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2229 return DECL_UID (ent->label_decl);
2233 named_label_entry_eq (const void *a, const void *b)
2235 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2236 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2237 return ent_a->label_decl == ent_b->label_decl;
2240 /* Create a new label, named ID. */
2243 make_label_decl (tree id, int local_p)
2245 struct named_label_entry *ent;
2249 decl = build_decl (LABEL_DECL, id, void_type_node);
2251 DECL_CONTEXT (decl) = current_function_decl;
2252 DECL_MODE (decl) = VOIDmode;
2253 C_DECLARED_LABEL_FLAG (decl) = local_p;
2255 /* Say where one reference is to the label, for the sake of the
2256 error if it is not defined. */
2257 DECL_SOURCE_LOCATION (decl) = input_location;
2259 /* Record the fact that this identifier is bound to this label. */
2260 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2262 /* Create the label htab for the function on demand. */
2264 named_labels = htab_create_ggc (13, named_label_entry_hash,
2265 named_label_entry_eq, NULL);
2267 /* Record this label on the list of labels used in this function.
2268 We do this before calling make_label_decl so that we get the
2269 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2270 ent = GGC_CNEW (struct named_label_entry);
2271 ent->label_decl = decl;
2273 slot = htab_find_slot (named_labels, ent, INSERT);
2274 gcc_assert (*slot == NULL);
2280 /* Look for a label named ID in the current function. If one cannot
2281 be found, create one. (We keep track of used, but undefined,
2282 labels, and complain about them at the end of a function.) */
2285 lookup_label (tree id)
2289 timevar_push (TV_NAME_LOOKUP);
2290 /* You can't use labels at global scope. */
2291 if (current_function_decl == NULL_TREE)
2293 error ("label %qE referenced outside of any function", id);
2294 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2297 /* See if we've already got this label. */
2298 decl = IDENTIFIER_LABEL_VALUE (id);
2299 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2300 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2302 decl = make_label_decl (id, /*local_p=*/0);
2303 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2306 /* Declare a local label named ID. */
2309 declare_local_label (tree id)
2313 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2314 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2315 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2316 current_binding_level->shadowed_labels);
2317 current_binding_level->shadowed_labels = shadow;
2319 decl = make_label_decl (id, /*local_p=*/1);
2320 TREE_VALUE (shadow) = decl;
2325 /* Returns nonzero if it is ill-formed to jump past the declaration of
2326 DECL. Returns 2 if it's also a real problem. */
2329 decl_jump_unsafe (tree decl)
2331 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2332 || TREE_TYPE (decl) == error_mark_node)
2335 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2336 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2339 if (pod_type_p (TREE_TYPE (decl)))
2342 /* The POD stuff is just pedantry; why should it matter if the class
2343 contains a field of pointer to member type? */
2347 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2350 identify_goto (tree decl, const location_t *locus)
2353 pedwarn ("jump to label %qD", decl);
2355 pedwarn ("jump to case label");
2357 pedwarn ("%H from here", locus);
2360 /* Check that a single previously seen jump to a newly defined label
2361 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2362 the jump context; NAMES are the names in scope in LEVEL at the jump
2363 context; LOCUS is the source position of the jump or 0. Returns
2364 true if all is well. */
2367 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2368 bool exited_omp, const location_t *locus)
2370 struct cp_binding_level *b;
2371 bool identified = false, saw_eh = false, saw_omp = false;
2375 identify_goto (decl, locus);
2376 error (" exits OpenMP structured block");
2377 identified = saw_omp = true;
2380 for (b = current_binding_level; b ; b = b->level_chain)
2382 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2384 for (new_decls = b->names; new_decls != old_decls;
2385 new_decls = TREE_CHAIN (new_decls))
2387 int problem = decl_jump_unsafe (new_decls);
2393 identify_goto (decl, locus);
2397 error (" crosses initialization of %q+#D", new_decls);
2399 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2404 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2408 identify_goto (decl, locus);
2411 if (b->kind == sk_try)
2412 error (" enters try block");
2414 error (" enters catch block");
2417 if (b->kind == sk_omp && !saw_omp)
2421 identify_goto (decl, locus);
2424 error (" enters OpenMP structured block");
2433 check_previous_goto (tree decl, struct named_label_use_entry *use)
2435 check_previous_goto_1 (decl, use->binding_level,
2436 use->names_in_scope, use->in_omp_scope,
2437 &use->o_goto_locus);
2441 check_switch_goto (struct cp_binding_level* level)
2443 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2446 /* Check that a new jump to a label DECL is OK. Called by
2447 finish_goto_stmt. */
2450 check_goto (tree decl)
2452 struct named_label_entry *ent, dummy;
2453 bool saw_catch = false, identified = false;
2456 /* We can't know where a computed goto is jumping.
2457 So we assume that it's OK. */
2458 if (TREE_CODE (decl) != LABEL_DECL)
2461 /* We didn't record any information about this label when we created it,
2462 and there's not much point since it's trivial to analyze as a return. */
2463 if (decl == cdtor_label)
2466 dummy.label_decl = decl;
2467 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2468 gcc_assert (ent != NULL);
2470 /* If the label hasn't been defined yet, defer checking. */
2471 if (! DECL_INITIAL (decl))
2473 struct named_label_use_entry *new_use;
2475 /* Don't bother creating another use if the last goto had the
2476 same data, and will therefore create the same set of errors. */
2478 && ent->uses->names_in_scope == current_binding_level->names)
2481 new_use = GGC_NEW (struct named_label_use_entry);
2482 new_use->binding_level = current_binding_level;
2483 new_use->names_in_scope = current_binding_level->names;
2484 new_use->o_goto_locus = input_location;
2485 new_use->in_omp_scope = false;
2487 new_use->next = ent->uses;
2488 ent->uses = new_use;
2492 if (ent->in_try_scope || ent->in_catch_scope
2493 || ent->in_omp_scope || ent->bad_decls)
2495 pedwarn ("jump to label %q+D", decl);
2496 pedwarn (" from here");
2500 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2502 tree b = TREE_VALUE (bad);
2503 int u = decl_jump_unsafe (b);
2505 if (u > 1 && DECL_ARTIFICIAL (b))
2507 /* Can't skip init of __exception_info. */
2508 error ("%J enters catch block", b);
2512 error (" skips initialization of %q+#D", b);
2514 pedwarn (" enters scope of non-POD %q+#D", b);
2517 if (ent->in_try_scope)
2518 error (" enters try block");
2519 else if (ent->in_catch_scope && !saw_catch)
2520 error (" enters catch block");
2522 if (ent->in_omp_scope)
2523 error (" enters OpenMP structured block");
2524 else if (flag_openmp)
2526 struct cp_binding_level *b;
2527 for (b = current_binding_level; b ; b = b->level_chain)
2529 if (b == ent->binding_level)
2531 if (b->kind == sk_omp)
2535 pedwarn ("jump to label %q+D", decl);
2536 pedwarn (" from here");
2539 error (" exits OpenMP structured block");
2546 /* Check that a return is ok wrt OpenMP structured blocks.
2547 Called by finish_return_stmt. Returns true if all is well. */
2550 check_omp_return (void)
2552 struct cp_binding_level *b;
2553 for (b = current_binding_level; b ; b = b->level_chain)
2554 if (b->kind == sk_omp)
2556 error ("invalid exit from OpenMP structured block");
2562 /* Define a label, specifying the location in the source file.
2563 Return the LABEL_DECL node for the label. */
2566 define_label (location_t location, tree name)
2568 struct named_label_entry *ent, dummy;
2569 struct cp_binding_level *p;
2572 timevar_push (TV_NAME_LOOKUP);
2574 decl = lookup_label (name);
2576 dummy.label_decl = decl;
2577 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2578 gcc_assert (ent != NULL);
2580 /* After labels, make any new cleanups in the function go into their
2581 own new (temporary) binding contour. */
2582 for (p = current_binding_level;
2583 p->kind != sk_function_parms;
2585 p->more_cleanups_ok = 0;
2587 if (name == get_identifier ("wchar_t"))
2588 pedwarn ("label named wchar_t");
2590 if (DECL_INITIAL (decl) != NULL_TREE)
2592 error ("duplicate label %qD", decl);
2593 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2597 struct named_label_use_entry *use;
2599 /* Mark label as having been defined. */
2600 DECL_INITIAL (decl) = error_mark_node;
2601 /* Say where in the source. */
2602 DECL_SOURCE_LOCATION (decl) = location;
2604 ent->binding_level = current_binding_level;
2605 ent->names_in_scope = current_binding_level->names;
2607 for (use = ent->uses; use ; use = use->next)
2608 check_previous_goto (decl, use);
2612 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2617 struct cp_binding_level *level;
2618 struct cp_switch *next;
2619 /* The SWITCH_STMT being built. */
2621 /* A splay-tree mapping the low element of a case range to the high
2622 element, or NULL_TREE if there is no high element. Used to
2623 determine whether or not a new case label duplicates an old case
2624 label. We need a tree, rather than simply a hash table, because
2625 of the GNU case range extension. */
2629 /* A stack of the currently active switch statements. The innermost
2630 switch statement is on the top of the stack. There is no need to
2631 mark the stack for garbage collection because it is only active
2632 during the processing of the body of a function, and we never
2633 collect at that point. */
2635 static struct cp_switch *switch_stack;
2637 /* Called right after a switch-statement condition is parsed.
2638 SWITCH_STMT is the switch statement being parsed. */
2641 push_switch (tree switch_stmt)
2643 struct cp_switch *p = XNEW (struct cp_switch);
2644 p->level = current_binding_level;
2645 p->next = switch_stack;
2646 p->switch_stmt = switch_stmt;
2647 p->cases = splay_tree_new (case_compare, NULL, NULL);
2654 struct cp_switch *cs = switch_stack;
2655 location_t switch_location;
2657 /* Emit warnings as needed. */
2658 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2659 switch_location = EXPR_LOCATION (cs->switch_stmt);
2661 switch_location = input_location;
2662 if (!processing_template_decl)
2663 c_do_switch_warnings (cs->cases, switch_location,
2664 SWITCH_STMT_TYPE (cs->switch_stmt),
2665 SWITCH_STMT_COND (cs->switch_stmt));
2667 splay_tree_delete (cs->cases);
2668 switch_stack = switch_stack->next;
2672 /* Note that we've seen a definition of a case label, and complain if this
2673 is a bad place for one. */
2676 finish_case_label (tree low_value, tree high_value)
2679 struct cp_binding_level *p;
2681 if (processing_template_decl)
2685 /* For templates, just add the case label; we'll do semantic
2686 analysis at instantiation-time. */
2687 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2688 return add_stmt (build_case_label (low_value, high_value, label));
2691 /* Find the condition on which this switch statement depends. */
2692 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2693 if (cond && TREE_CODE (cond) == TREE_LIST)
2694 cond = TREE_VALUE (cond);
2696 if (!check_switch_goto (switch_stack->level))
2697 return error_mark_node;
2699 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2700 low_value, high_value);
2702 /* After labels, make any new cleanups in the function go into their
2703 own new (temporary) binding contour. */
2704 for (p = current_binding_level;
2705 p->kind != sk_function_parms;
2707 p->more_cleanups_ok = 0;
2712 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2715 typename_hash (const void* k)
2718 const_tree const t = (const_tree) k;
2720 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2721 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2726 typedef struct typename_info {
2734 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2735 really of type `typename_info*' */
2738 typename_compare (const void * k1, const void * k2)
2740 const_tree const t1 = (const_tree) k1;
2741 const typename_info *const t2 = (const typename_info *) k2;
2743 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2744 && TYPE_CONTEXT (t1) == t2->scope
2745 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2746 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2747 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2750 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2751 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2753 Returns the new TYPENAME_TYPE. */
2755 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2758 build_typename_type (tree context, tree name, tree fullname,
2759 enum tag_types tag_type)
2767 if (typename_htab == NULL)
2768 typename_htab = htab_create_ggc (61, &typename_hash,
2769 &typename_compare, NULL);
2771 ti.scope = FROB_CONTEXT (context);
2773 ti.template_id = fullname;
2774 ti.enum_p = tag_type == enum_type;
2775 ti.class_p = (tag_type == class_type
2776 || tag_type == record_type
2777 || tag_type == union_type);
2778 hash = (htab_hash_pointer (ti.scope)
2779 ^ htab_hash_pointer (ti.name));
2781 /* See if we already have this type. */
2782 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2787 /* Build the TYPENAME_TYPE. */
2788 t = make_aggr_type (TYPENAME_TYPE);
2789 TYPE_CONTEXT (t) = ti.scope;
2790 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2791 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2792 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2794 /* Build the corresponding TYPE_DECL. */
2795 d = build_decl (TYPE_DECL, name, t);
2796 TYPE_NAME (TREE_TYPE (d)) = d;
2797 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2798 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2799 DECL_ARTIFICIAL (d) = 1;
2801 /* Store it in the hash table. */
2804 /* TYPENAME_TYPEs must always be compared structurally, because
2805 they may or may not resolve down to another type depending on
2806 the currently open classes. */
2807 SET_TYPE_STRUCTURAL_EQUALITY (t);
2813 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2814 provided to name the type. Returns an appropriate type, unless an
2815 error occurs, in which case error_mark_node is returned. If we
2816 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2817 return that, rather than the _TYPE it corresponds to, in other
2818 cases we look through the type decl. If TF_ERROR is set, complain
2819 about errors, otherwise be quiet. */
2822 make_typename_type (tree context, tree name, enum tag_types tag_type,
2823 tsubst_flags_t complain)
2829 if (name == error_mark_node
2830 || context == NULL_TREE
2831 || context == error_mark_node)
2832 return error_mark_node;
2836 if (!(TYPE_LANG_SPECIFIC (name)
2837 && (CLASSTYPE_IS_TEMPLATE (name)
2838 || CLASSTYPE_USE_TEMPLATE (name))))
2839 name = TYPE_IDENTIFIER (name);
2841 /* Create a TEMPLATE_ID_EXPR for the type. */
2842 name = build_nt (TEMPLATE_ID_EXPR,
2843 CLASSTYPE_TI_TEMPLATE (name),
2844 CLASSTYPE_TI_ARGS (name));
2846 else if (TREE_CODE (name) == TYPE_DECL)
2847 name = DECL_NAME (name);
2851 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2853 name = TREE_OPERAND (name, 0);
2854 if (TREE_CODE (name) == TEMPLATE_DECL)
2855 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2856 else if (TREE_CODE (name) == OVERLOAD)
2858 error ("%qD is not a type", name);
2859 return error_mark_node;
2862 if (TREE_CODE (name) == TEMPLATE_DECL)
2864 error ("%qD used without template parameters", name);
2865 return error_mark_node;
2867 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2868 gcc_assert (TYPE_P (context));
2870 /* When the CONTEXT is a dependent type, NAME could refer to a
2871 dependent base class of CONTEXT. So we cannot peek inside it,
2872 even if CONTEXT is a currently open scope. */
2873 if (dependent_type_p (context))
2874 return build_typename_type (context, name, fullname, tag_type);
2876 if (!IS_AGGR_TYPE (context))
2878 if (complain & tf_error)
2879 error ("%q#T is not a class", context);
2880 return error_mark_node;
2883 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2885 /* We should only set WANT_TYPE when we're a nested typename type.
2886 Then we can give better diagnostics if we find a non-type. */
2887 t = lookup_field (context, name, 0, /*want_type=*/true);
2890 if (complain & tf_error)
2891 error (want_template ? "no class template named %q#T in %q#T"
2892 : "no type named %q#T in %q#T", name, context);
2893 return error_mark_node;
2896 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
2898 if (complain & tf_error)
2899 error ("%<typename %T::%D%> names %q#T, which is not a class template",
2901 return error_mark_node;
2903 if (!want_template && TREE_CODE (t) != TYPE_DECL)
2905 if (complain & tf_error)
2906 error ("%<typename %T::%D%> names %q#T, which is not a type",
2908 return error_mark_node;
2911 if (complain & tf_error)
2912 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
2915 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
2917 /*entering_scope=*/0,
2918 tf_warning_or_error | tf_user);
2920 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
2926 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
2927 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
2928 in which case error_mark_node is returned.
2930 If PARM_LIST is non-NULL, also make sure that the template parameter
2931 list of TEMPLATE_DECL matches.
2933 If COMPLAIN zero, don't complain about any errors that occur. */
2936 make_unbound_class_template (tree context, tree name, tree parm_list,
2937 tsubst_flags_t complain)
2943 name = TYPE_IDENTIFIER (name);
2944 else if (DECL_P (name))
2945 name = DECL_NAME (name);
2946 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2948 if (!dependent_type_p (context)
2949 || currently_open_class (context))
2951 tree tmpl = NULL_TREE;
2953 if (IS_AGGR_TYPE (context))
2954 tmpl = lookup_field (context, name, 0, false);
2956 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
2958 if (complain & tf_error)
2959 error ("no class template named %q#T in %q#T", name, context);
2960 return error_mark_node;
2964 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
2966 if (complain & tf_error)
2968 error ("template parameters do not match template");
2969 error ("%q+D declared here", tmpl);
2971 return error_mark_node;
2974 if (complain & tf_error)
2975 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
2980 /* Build the UNBOUND_CLASS_TEMPLATE. */
2981 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
2982 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
2983 TREE_TYPE (t) = NULL_TREE;
2984 SET_TYPE_STRUCTURAL_EQUALITY (t);
2986 /* Build the corresponding TEMPLATE_DECL. */
2987 d = build_decl (TEMPLATE_DECL, name, t);
2988 TYPE_NAME (TREE_TYPE (d)) = d;
2989 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2990 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2991 DECL_ARTIFICIAL (d) = 1;
2992 DECL_TEMPLATE_PARMS (d) = parm_list;
2999 /* Push the declarations of builtin types into the namespace.
3000 RID_INDEX is the index of the builtin type in the array
3001 RID_POINTERS. NAME is the name used when looking up the builtin
3002 type. TYPE is the _TYPE node for the builtin type. */
3005 record_builtin_type (enum rid rid_index,
3009 tree rname = NULL_TREE, tname = NULL_TREE;
3010 tree tdecl = NULL_TREE;
3012 if ((int) rid_index < (int) RID_MAX)
3013 rname = ridpointers[(int) rid_index];
3015 tname = get_identifier (name);
3017 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3018 eliminated. Built-in types should not be looked up name; their
3019 names are keywords that the parser can recognize. However, there
3020 is code in c-common.c that uses identifier_global_value to look
3021 up built-in types by name. */
3024 tdecl = build_decl (TYPE_DECL, tname, type);
3025 DECL_ARTIFICIAL (tdecl) = 1;
3026 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3032 tdecl = build_decl (TYPE_DECL, rname, type);
3033 DECL_ARTIFICIAL (tdecl) = 1;
3035 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3038 if (!TYPE_NAME (type))
3039 TYPE_NAME (type) = tdecl;
3042 debug_hooks->type_decl (tdecl, 0);
3045 /* Record one of the standard Java types.
3046 * Declare it as having the given NAME.
3047 * If SIZE > 0, it is the size of one of the integral types;
3048 * otherwise it is the negative of the size of one of the other types. */
3051 record_builtin_java_type (const char* name, int size)
3055 type = make_signed_type (size);
3056 else if (size > -32)
3057 { /* "__java_char" or ""__java_boolean". */
3058 type = make_unsigned_type (-size);
3059 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3062 { /* "__java_float" or ""__java_double". */
3063 type = make_node (REAL_TYPE);
3064 TYPE_PRECISION (type) = - size;
3067 record_builtin_type (RID_MAX, name, type);
3068 decl = TYPE_NAME (type);
3070 /* Suppress generate debug symbol entries for these types,
3071 since for normal C++ they are just clutter.
3072 However, push_lang_context undoes this if extern "Java" is seen. */
3073 DECL_IGNORED_P (decl) = 1;
3075 TYPE_FOR_JAVA (type) = 1;
3079 /* Push a type into the namespace so that the back ends ignore it. */
3082 record_unknown_type (tree type, const char* name)
3084 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3085 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3086 DECL_IGNORED_P (decl) = 1;
3087 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3088 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3089 TYPE_ALIGN (type) = 1;
3090 TYPE_USER_ALIGN (type) = 0;
3091 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3094 /* A string for which we should create an IDENTIFIER_NODE at
3097 typedef struct predefined_identifier
3099 /* The name of the identifier. */
3100 const char *const name;
3101 /* The place where the IDENTIFIER_NODE should be stored. */
3103 /* Nonzero if this is the name of a constructor or destructor. */
3104 const int ctor_or_dtor_p;
3105 } predefined_identifier;
3107 /* Create all the predefined identifiers. */
3110 initialize_predefined_identifiers (void)
3112 const predefined_identifier *pid;
3114 /* A table of identifiers to create at startup. */
3115 static const predefined_identifier predefined_identifiers[] = {
3116 { "C++", &lang_name_cplusplus, 0 },
3117 { "C", &lang_name_c, 0 },
3118 { "Java", &lang_name_java, 0 },
3119 /* Some of these names have a trailing space so that it is
3120 impossible for them to conflict with names written by users. */
3121 { "__ct ", &ctor_identifier, 1 },
3122 { "__base_ctor ", &base_ctor_identifier, 1 },
3123 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3124 { "__dt ", &dtor_identifier, 1 },
3125 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3126 { "__base_dtor ", &base_dtor_identifier, 1 },
3127 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3128 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3129 { "nelts", &nelts_identifier, 0 },
3130 { THIS_NAME, &this_identifier, 0 },
3131 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3132 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3133 { "_vptr", &vptr_identifier, 0 },
3134 { "__vtt_parm", &vtt_parm_identifier, 0 },
3135 { "::", &global_scope_name, 0 },
3136 { "std", &std_identifier, 0 },
3140 for (pid = predefined_identifiers; pid->name; ++pid)
3142 *pid->node = get_identifier (pid->name);
3143 if (pid->ctor_or_dtor_p)
3144 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3148 /* Create the predefined scalar types of C,
3149 and some nodes representing standard constants (0, 1, (void *)0).
3150 Initialize the global binding level.
3151 Make definitions for built-in primitive functions. */
3154 cxx_init_decl_processing (void)
3157 tree void_ftype_ptr;
3159 build_common_tree_nodes (flag_signed_char, false);
3161 /* Create all the identifiers we need. */
3162 initialize_predefined_identifiers ();
3164 /* Create the global variables. */
3165 push_to_top_level ();
3167 current_function_decl = NULL_TREE;
3168 current_binding_level = NULL;
3169 /* Enter the global namespace. */
3170 gcc_assert (global_namespace == NULL_TREE);
3171 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3173 TREE_PUBLIC (global_namespace) = 1;
3174 begin_scope (sk_namespace, global_namespace);
3176 current_lang_name = NULL_TREE;
3178 if (flag_visibility_ms_compat)
3179 default_visibility = VISIBILITY_HIDDEN;
3182 current_lang_name = lang_name_c;
3184 /* Create the `std' namespace. */
3185 push_namespace (std_identifier);
3186 std_node = current_namespace;
3189 c_common_nodes_and_builtins ();
3191 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3192 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3193 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3194 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3195 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3196 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3197 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3198 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3200 integer_two_node = build_int_cst (NULL_TREE, 2);
3201 integer_three_node = build_int_cst (NULL_TREE, 3);
3203 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3204 truthvalue_type_node = boolean_type_node;
3205 truthvalue_false_node = boolean_false_node;
3206 truthvalue_true_node = boolean_true_node;
3208 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3211 record_builtin_type (RID_MAX, NULL, string_type_node);
3214 delta_type_node = ptrdiff_type_node;
3215 vtable_index_type = ptrdiff_type_node;
3217 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3218 void_ftype = build_function_type (void_type_node, void_list_node);
3219 void_ftype_ptr = build_function_type (void_type_node,
3220 tree_cons (NULL_TREE,
3224 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3226 /* C++ extensions */
3228 unknown_type_node = make_node (UNKNOWN_TYPE);
3229 record_unknown_type (unknown_type_node, "unknown type");
3231 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3232 TREE_TYPE (unknown_type_node) = unknown_type_node;
3234 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3236 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3237 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3240 /* Make sure we get a unique function type, so we can give
3241 its pointer type a name. (This wins for gdb.) */
3242 tree vfunc_type = make_node (FUNCTION_TYPE);
3243 TREE_TYPE (vfunc_type) = integer_type_node;
3244 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3245 layout_type (vfunc_type);
3247 vtable_entry_type = build_pointer_type (vfunc_type);
3249 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3252 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3253 layout_type (vtbl_type_node);
3254 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3255 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3256 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3257 layout_type (vtbl_ptr_type_node);
3258 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3260 push_namespace (get_identifier ("__cxxabiv1"));
3261 abi_node = current_namespace;
3264 global_type_node = make_node (LANG_TYPE);
3265 record_unknown_type (global_type_node, "global type");
3268 current_lang_name = lang_name_cplusplus;
3272 tree bad_alloc_type_node;
3273 tree bad_alloc_decl;
3274 tree newtype, deltype;
3275 tree ptr_ftype_sizetype;
3277 push_namespace (std_identifier);
3278 bad_alloc_id = get_identifier ("bad_alloc");
3279 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3280 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3282 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3283 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3284 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3288 = build_function_type (ptr_type_node,
3289 tree_cons (NULL_TREE,
3292 newtype = build_exception_variant
3293 (ptr_ftype_sizetype, add_exception_specifier
3294 (NULL_TREE, bad_alloc_type_node, -1));
3295 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3296 push_cp_library_fn (NEW_EXPR, newtype);
3297 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3298 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3299 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3303 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3305 /* Perform other language dependent initializations. */
3306 init_class_processing ();
3307 init_rtti_processing ();
3309 if (flag_exceptions)
3310 init_exception_processing ();
3312 if (! supports_one_only ())
3315 make_fname_decl = cp_make_fname_decl;
3316 start_fname_decls ();
3318 /* Show we use EH for cleanups. */
3319 if (flag_exceptions)
3320 using_eh_for_cleanups ();
3323 /* Generate an initializer for a function naming variable from
3324 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3325 filled in with the type of the init. */
3328 cp_fname_init (const char* name, tree *type_p)
3330 tree domain = NULL_TREE;
3332 tree init = NULL_TREE;
3337 length = strlen (name);
3338 domain = build_index_type (size_int (length));
3339 init = build_string (length + 1, name);
3342 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3343 type = build_cplus_array_type (type, domain);
3348 TREE_TYPE (init) = type;
3350 init = error_mark_node;
3355 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3356 decl, NAME is the initialization string and TYPE_DEP indicates whether
3357 NAME depended on the type of the function. We make use of that to detect
3358 __PRETTY_FUNCTION__ inside a template fn. This is being done
3359 lazily at the point of first use, so we mustn't push the decl now. */
3362 cp_make_fname_decl (tree id, int type_dep)
3364 const char *const name = (type_dep && processing_template_decl
3365 ? NULL : fname_as_string (type_dep));
3367 tree init = cp_fname_init (name, &type);
3368 tree decl = build_decl (VAR_DECL, id, type);
3371 free ((char *) name);
3373 /* As we're using pushdecl_with_scope, we must set the context. */
3374 DECL_CONTEXT (decl) = current_function_decl;
3375 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3377 TREE_STATIC (decl) = 1;
3378 TREE_READONLY (decl) = 1;
3379 DECL_ARTIFICIAL (decl) = 1;
3381 TREE_USED (decl) = 1;
3383 if (current_function_decl)
3385 struct cp_binding_level *b = current_binding_level;
3386 while (b->level_chain->kind != sk_function_parms)
3388 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3389 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3390 LOOKUP_ONLYCONVERTING);
3393 pushdecl_top_level_and_finish (decl, init);
3399 builtin_function_1 (tree decl, tree context)
3401 tree id = DECL_NAME (decl);
3402 const char *name = IDENTIFIER_POINTER (id);
3404 retrofit_lang_decl (decl);
3406 /* All nesting of C++ functions is lexical; there is never a "static
3407 chain" in the sense of GNU C nested functions. */
3408 DECL_NO_STATIC_CHAIN (decl) = 1;
3410 DECL_ARTIFICIAL (decl) = 1;
3411 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3412 SET_DECL_LANGUAGE (decl, lang_c);
3413 /* Runtime library routines are, by definition, available in an
3414 external shared object. */
3415 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3416 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3418 DECL_CONTEXT (decl) = context;
3422 /* A function in the user's namespace should have an explicit
3423 declaration before it is used. Mark the built-in function as
3424 anticipated but not actually declared. */
3425 if (name[0] != '_' || name[1] != '_')
3426 DECL_ANTICIPATED (decl) = 1;
3432 cxx_builtin_function (tree decl)
3434 tree id = DECL_NAME (decl);
3435 const char *name = IDENTIFIER_POINTER (id);
3436 /* All builtins that don't begin with an '_' should additionally
3437 go in the 'std' namespace. */
3440 tree decl2 = copy_node(decl);
3441 push_namespace (std_identifier);
3442 builtin_function_1 (decl2, std_node);
3446 return builtin_function_1 (decl, NULL_TREE);
3449 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3450 function. Not called directly. */
3453 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3455 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3456 DECL_EXTERNAL (fn) = 1;
3457 TREE_PUBLIC (fn) = 1;
3458 DECL_ARTIFICIAL (fn) = 1;
3459 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3460 SET_DECL_LANGUAGE (fn, lang_c);
3461 /* Runtime library routines are, by definition, available in an
3462 external shared object. */
3463 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3464 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3468 /* Returns the _DECL for a library function with C linkage.
3469 We assume that such functions never throw; if this is incorrect,
3470 callers should unset TREE_NOTHROW. */
3473 build_library_fn (tree name, tree type)
3475 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3476 TREE_NOTHROW (fn) = 1;
3480 /* Returns the _DECL for a library function with C++ linkage. */
3483 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3485 tree fn = build_library_fn_1 (name, operator_code, type);
3486 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3487 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3488 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3492 /* Like build_library_fn, but takes a C string instead of an
3496 build_library_fn_ptr (const char* name, tree type)
3498 return build_library_fn (get_identifier (name), type);
3501 /* Like build_cp_library_fn, but takes a C string instead of an
3505 build_cp_library_fn_ptr (const char* name, tree type)
3507 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3510 /* Like build_library_fn, but also pushes the function so that we will
3511 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3514 push_library_fn (tree name, tree type)
3516 tree fn = build_library_fn (name, type);
3517 pushdecl_top_level (fn);
3521 /* Like build_cp_library_fn, but also pushes the function so that it
3522 will be found by normal lookup. */
3525 push_cp_library_fn (enum tree_code operator_code, tree type)
3527 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3534 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3538 push_void_library_fn (tree name, tree parmtypes)
3540 tree type = build_function_type (void_type_node, parmtypes);
3541 return push_library_fn (name, type);
3544 /* Like push_library_fn, but also note that this function throws
3545 and does not return. Used for __throw_foo and the like. */
3548 push_throw_library_fn (tree name, tree type)
3550 tree fn = push_library_fn (name, type);
3551 TREE_THIS_VOLATILE (fn) = 1;
3552 TREE_NOTHROW (fn) = 0;
3556 /* When we call finish_struct for an anonymous union, we create
3557 default copy constructors and such. But, an anonymous union
3558 shouldn't have such things; this function undoes the damage to the
3559 anonymous union type T.
3561 (The reason that we create the synthesized methods is that we don't
3562 distinguish `union { int i; }' from `typedef union { int i; } U'.
3563 The first is an anonymous union; the second is just an ordinary
3567 fixup_anonymous_aggr (tree t)
3571 /* Wipe out memory of synthesized methods. */
3572 TYPE_HAS_CONSTRUCTOR (t) = 0;
3573 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3574 TYPE_HAS_INIT_REF (t) = 0;
3575 TYPE_HAS_CONST_INIT_REF (t) = 0;
3576 TYPE_HAS_ASSIGN_REF (t) = 0;
3577 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3579 /* Splice the implicitly generated functions out of the TYPE_METHODS
3581 q = &TYPE_METHODS (t);
3584 if (DECL_ARTIFICIAL (*q))
3585 *q = TREE_CHAIN (*q);
3587 q = &TREE_CHAIN (*q);
3590 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3591 if (TYPE_METHODS (t))
3592 error ("%Jan anonymous union cannot have function members",
3593 TYPE_MAIN_DECL (t));
3595 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3596 assignment operators (because they cannot have these methods themselves).
3597 For anonymous unions this is already checked because they are not allowed
3598 in any union, otherwise we have to check it. */
3599 if (TREE_CODE (t) != UNION_TYPE)
3603 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3604 if (TREE_CODE (field) == FIELD_DECL)
3606 type = TREE_TYPE (field);
3607 if (CLASS_TYPE_P (type))
3609 if (TYPE_NEEDS_CONSTRUCTING (type))
3610 error ("member %q+#D with constructor not allowed "
3611 "in anonymous aggregate", field);
3612 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3613 error ("member %q+#D with destructor not allowed "
3614 "in anonymous aggregate", field);
3615 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3616 error ("member %q+#D with copy assignment operator "
3617 "not allowed in anonymous aggregate", field);
3623 /* Make sure that a declaration with no declarator is well-formed, i.e.
3624 just declares a tagged type or anonymous union.
3626 Returns the type declared; or NULL_TREE if none. */
3629 check_tag_decl (cp_decl_specifier_seq *declspecs)
3631 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3632 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3633 /* If a class, struct, or enum type is declared by the DECLSPECS
3634 (i.e, if a class-specifier, enum-specifier, or non-typename
3635 elaborated-type-specifier appears in the DECLSPECS),
3636 DECLARED_TYPE is set to the corresponding type. */
3637 tree declared_type = NULL_TREE;
3638 bool error_p = false;
3640 if (declspecs->multiple_types_p)
3641 error ("multiple types in one declaration");
3642 else if (declspecs->redefined_builtin_type)
3644 if (!in_system_header)
3645 pedwarn ("redeclaration of C++ built-in type %qT",
3646 declspecs->redefined_builtin_type);
3651 && TYPE_P (declspecs->type)
3652 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3653 && IS_AGGR_TYPE (declspecs->type))
3654 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3655 declared_type = declspecs->type;
3656 else if (declspecs->type == error_mark_node)
3658 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3659 pedwarn ("declaration does not declare anything");
3660 /* Check for an anonymous union. */
3661 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3662 && TYPE_ANONYMOUS_P (declared_type))
3664 /* 7/3 In a simple-declaration, the optional init-declarator-list
3665 can be omitted only when declaring a class (clause 9) or
3666 enumeration (7.2), that is, when the decl-specifier-seq contains
3667 either a class-specifier, an elaborated-type-specifier with
3668 a class-key (9.1), or an enum-specifier. In these cases and
3669 whenever a class-specifier or enum-specifier is present in the
3670 decl-specifier-seq, the identifiers in these specifiers are among
3671 the names being declared by the declaration (as class-name,
3672 enum-names, or enumerators, depending on the syntax). In such
3673 cases, and except for the declaration of an unnamed bit-field (9.6),
3674 the decl-specifier-seq shall introduce one or more names into the
3675 program, or shall redeclare a name introduced by a previous
3676 declaration. [Example:
3677 enum { }; // ill-formed
3678 typedef class { }; // ill-formed
3682 error ("missing type-name in typedef-declaration");
3685 /* Anonymous unions are objects, so they can have specifiers. */;
3686 SET_ANON_AGGR_TYPE_P (declared_type);
3688 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3689 && !in_system_header)
3690 pedwarn ("ISO C++ prohibits anonymous structs");
3695 if (declspecs->specs[(int)ds_inline]
3696 || declspecs->specs[(int)ds_virtual])
3697 error ("%qs can only be specified for functions",
3698 declspecs->specs[(int)ds_inline]
3699 ? "inline" : "virtual");
3701 && (!current_class_type
3702 || current_scope () != current_class_type))
3703 error ("%<friend%> can only be specified inside a class");
3704 else if (declspecs->specs[(int)ds_explicit])
3705 error ("%<explicit%> can only be specified for constructors");
3706 else if (declspecs->storage_class)
3707 error ("a storage class can only be specified for objects "
3709 else if (declspecs->specs[(int)ds_const]
3710 || declspecs->specs[(int)ds_volatile]
3711 || declspecs->specs[(int)ds_restrict]
3712 || declspecs->specs[(int)ds_thread])
3713 error ("qualifiers can only be specified for objects "
3715 else if (saw_typedef)
3716 warning (0, "%<typedef%> was ignored in this declaration");
3719 return declared_type;
3722 /* Called when a declaration is seen that contains no names to declare.
3723 If its type is a reference to a structure, union or enum inherited
3724 from a containing scope, shadow that tag name for the current scope
3725 with a forward reference.
3726 If its type defines a new named structure or union
3727 or defines an enum, it is valid but we need not do anything here.
3728 Otherwise, it is an error.
3730 C++: may have to grok the declspecs to learn about static,
3731 complain for anonymous unions.
3733 Returns the TYPE declared -- or NULL_TREE if none. */
3736 shadow_tag (cp_decl_specifier_seq *declspecs)
3738 tree t = check_tag_decl (declspecs);
3743 if (declspecs->attributes)
3745 warning (0, "attribute ignored in declaration of %q+#T", t);
3746 warning (0, "attribute for %q+#T must follow the %qs keyword",
3747 t, class_key_or_enum_as_string (t));
3751 if (maybe_process_partial_specialization (t) == error_mark_node)
3754 /* This is where the variables in an anonymous union are
3755 declared. An anonymous union declaration looks like:
3757 because there is no declarator after the union, the parser
3758 sends that declaration here. */
3759 if (ANON_AGGR_TYPE_P (t))
3761 fixup_anonymous_aggr (t);
3763 if (TYPE_FIELDS (t))
3765 tree decl = grokdeclarator (/*declarator=*/NULL,
3766 declspecs, NORMAL, 0, NULL);
3767 finish_anon_union (decl);
3774 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3777 groktypename (cp_decl_specifier_seq *type_specifiers,
3778 const cp_declarator *declarator)
3782 attrs = type_specifiers->attributes;
3783 type_specifiers->attributes = NULL_TREE;
3784 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3786 cplus_decl_attributes (&type, attrs, 0);
3790 /* Decode a declarator in an ordinary declaration or data definition.
3791 This is called as soon as the type information and variable name
3792 have been parsed, before parsing the initializer if any.
3793 Here we create the ..._DECL node, fill in its type,
3794 and put it on the list of decls for the current context.
3795 The ..._DECL node is returned as the value.
3797 Exception: for arrays where the length is not specified,
3798 the type is left null, to be filled in by `cp_finish_decl'.
3800 Function definitions do not come here; they go to start_function
3801 instead. However, external and forward declarations of functions
3802 do go through here. Structure field declarations are done by
3803 grokfield and not through here. */
3806 start_decl (const cp_declarator *declarator,
3807 cp_decl_specifier_seq *declspecs,
3810 tree prefix_attributes,
3811 tree *pushed_scope_p)
3818 *pushed_scope_p = NULL_TREE;
3820 /* An object declared as __attribute__((deprecated)) suppresses
3821 warnings of uses of other deprecated items. */
3822 if (lookup_attribute ("deprecated", attributes))
3823 deprecated_state = DEPRECATED_SUPPRESS;
3825 attributes = chainon (attributes, prefix_attributes);
3827 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3830 deprecated_state = DEPRECATED_NORMAL;
3832 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3833 || decl == error_mark_node)
3834 return error_mark_node;
3836 type = TREE_TYPE (decl);
3838 context = DECL_CONTEXT (decl);
3842 *pushed_scope_p = push_scope (context);
3844 /* We are only interested in class contexts, later. */
3845 if (TREE_CODE (context) == NAMESPACE_DECL)
3846 context = NULL_TREE;
3850 /* Is it valid for this decl to have an initializer at all?
3851 If not, set INITIALIZED to zero, which will indirectly
3852 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3853 switch (TREE_CODE (decl))
3856 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3857 return error_mark_node;
3860 error ("function %q#D is initialized like a variable", decl);
3861 return error_mark_node;
3869 if (! toplevel_bindings_p ()
3870 && DECL_EXTERNAL (decl))
3871 warning (0, "declaration of %q#D has %<extern%> and is initialized",
3873 DECL_EXTERNAL (decl) = 0;
3874 if (toplevel_bindings_p ())
3875 TREE_STATIC (decl) = 1;
3878 /* Set attributes here so if duplicate decl, will have proper attributes. */
3879 cplus_decl_attributes (&decl, attributes, 0);
3881 /* Dllimported symbols cannot be defined. Static data members (which
3882 can be initialized in-class and dllimported) go through grokfield,
3883 not here, so we don't need to exclude those decls when checking for
3885 if (initialized && DECL_DLLIMPORT_P (decl))
3887 error ("definition of %q#D is marked %<dllimport%>", decl);
3888 DECL_DLLIMPORT_P (decl) = 0;
3891 /* If #pragma weak was used, mark the decl weak now. */
3892 maybe_apply_pragma_weak (decl);
3894 if (TREE_CODE (decl) == FUNCTION_DECL
3895 && DECL_DECLARED_INLINE_P (decl)
3896 && DECL_UNINLINABLE (decl)
3897 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3898 warning (0, "inline function %q+D given attribute noinline", decl);
3900 if (context && COMPLETE_TYPE_P (complete_type (context)))
3902 if (TREE_CODE (decl) == VAR_DECL)
3904 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
3905 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
3906 error ("%q#D is not a static member of %q#T", decl, context);
3909 if (DECL_CONTEXT (field) != context)
3911 if (!same_type_p (DECL_CONTEXT (field), context))
3912 pedwarn ("ISO C++ does not permit %<%T::%D%> "
3913 "to be defined as %<%T::%D%>",
3914 DECL_CONTEXT (field), DECL_NAME (decl),
3915 context, DECL_NAME (decl));
3916 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
3918 if (processing_specialization
3919 && template_class_depth (context) == 0
3920 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
3921 error ("template header not allowed in member definition "
3922 "of explicitly specialized class");
3923 /* Static data member are tricky; an in-class initialization
3924 still doesn't provide a definition, so the in-class
3925 declaration will have DECL_EXTERNAL set, but will have an
3926 initialization. Thus, duplicate_decls won't warn
3927 about this situation, and so we check here. */
3928 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
3929 error ("duplicate initialization of %qD", decl);
3930 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
3936 tree field = check_classfn (context, decl,
3937 (processing_template_decl
3938 > template_class_depth (context))
3939 ? current_template_parms
3941 if (field && duplicate_decls (decl, field,
3942 /*newdecl_is_friend=*/false))
3946 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3947 DECL_IN_AGGR_P (decl) = 0;
3948 /* Do not mark DECL as an explicit specialization if it was not
3949 already marked as an instantiation; a declaration should
3950 never be marked as a specialization unless we know what
3951 template is being specialized. */
3952 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3954 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3956 /* [temp.expl.spec] An explicit specialization of a static data
3957 member of a template is a definition if the declaration
3958 includes an initializer; otherwise, it is a declaration.
3960 We check for processing_specialization so this only applies
3961 to the new specialization syntax. */
3962 if (!initialized && processing_specialization)
3963 DECL_EXTERNAL (decl) = 1;
3966 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3967 pedwarn ("declaration of %q#D outside of class is not definition",
3971 was_public = TREE_PUBLIC (decl);
3973 /* Enter this declaration into the symbol table. */
3974 tem = maybe_push_decl (decl);
3976 if (processing_template_decl)
3977 tem = push_template_decl (tem);
3978 if (tem == error_mark_node)
3979 return error_mark_node;
3981 /* Tell the back end to use or not use .common as appropriate. If we say
3982 -fconserve-space, we want this to save .data space, at the expense of
3983 wrong semantics. If we say -fno-conserve-space, we want this to
3984 produce errors about redefs; to do this we force variables into the
3986 if (flag_conserve_space
3987 && TREE_CODE (tem) == VAR_DECL
3988 && TREE_PUBLIC (tem)
3989 && !DECL_THREAD_LOCAL_P (tem)
3990 && !have_global_bss_p ())
3991 DECL_COMMON (tem) = 1;
3993 if (TREE_CODE (tem) == VAR_DECL
3994 && DECL_NAMESPACE_SCOPE_P (tem) && !TREE_PUBLIC (tem) && !was_public
3995 && !DECL_THIS_STATIC (tem) && !DECL_ARTIFICIAL (tem))
3997 /* This is a const variable with implicit 'static'. Set
3998 DECL_THIS_STATIC so we can tell it from variables that are
3999 !TREE_PUBLIC because of the anonymous namespace. */
4000 gcc_assert (cp_type_readonly (TREE_TYPE (tem)));
4001 DECL_THIS_STATIC (tem) = 1;
4004 if (!processing_template_decl && TREE_CODE (tem) == VAR_DECL)
4005 start_decl_1 (tem, initialized);
4011 start_decl_1 (tree decl, bool initialized)
4015 gcc_assert (!processing_template_decl);
4017 if (error_operand_p (decl))
4020 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4021 type = TREE_TYPE (decl);
4024 /* Is it valid for this decl to have an initializer at all?
4025 If not, set INITIALIZED to zero, which will indirectly
4026 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4028 /* Don't allow initializations for incomplete types except for
4029 arrays which might be completed by the initialization. */
4030 if (COMPLETE_TYPE_P (complete_type (type)))
4031 ; /* A complete type is ok. */
4032 else if (TREE_CODE (type) != ARRAY_TYPE)
4034 error ("variable %q#D has initializer but incomplete type", decl);
4036 type = TREE_TYPE (decl) = error_mark_node;
4038 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4040 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4041 error ("elements of array %q#D have incomplete type", decl);
4042 /* else we already gave an error in start_decl. */
4046 else if (IS_AGGR_TYPE (type)
4047 && ! DECL_EXTERNAL (decl))
4049 if (!COMPLETE_TYPE_P (complete_type (type)))
4051 error ("aggregate %q#D has incomplete type and cannot be defined",
4053 /* Change the type so that assemble_variable will give
4054 DECL an rtl we can live with: (mem (const_int 0)). */
4055 type = TREE_TYPE (decl) = error_mark_node;
4059 /* If any base type in the hierarchy of TYPE needs a constructor,
4060 then we set initialized to 1. This way any nodes which are
4061 created for the purposes of initializing this aggregate
4062 will live as long as it does. This is necessary for global
4063 aggregates which do not have their initializers processed until
4064 the end of the file. */
4065 initialized = TYPE_NEEDS_CONSTRUCTING (type);
4069 /* Create a new scope to hold this declaration if necessary.
4070 Whether or not a new scope is necessary cannot be determined
4071 until after the type has been completed; if the type is a
4072 specialization of a class template it is not until after
4073 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4074 will be set correctly. */
4075 maybe_push_cleanup_level (type);
4078 /* Handle initialization of references. DECL, TYPE, and INIT have the
4079 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4080 but will be set to a new CLEANUP_STMT if a temporary is created
4081 that must be destroyed subsequently.
4083 Returns an initializer expression to use to initialize DECL, or
4084 NULL if the initialization can be performed statically.
4086 Quotes on semantics can be found in ARM 8.4.3. */
4089 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4093 if (init == NULL_TREE)
4095 if ((DECL_LANG_SPECIFIC (decl) == 0
4096 || DECL_IN_AGGR_P (decl) == 0)
4097 && ! DECL_THIS_EXTERN (decl))
4098 error ("%qD declared as reference but not initialized", decl);
4102 if (TREE_CODE (init) == CONSTRUCTOR)
4104 error ("ISO C++ forbids use of initializer list to "
4105 "initialize reference %qD", decl);
4109 if (TREE_CODE (init) == TREE_LIST)
4110 init = build_x_compound_expr_from_list (init, "initializer");
4112 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4113 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4114 /* Note: default conversion is only called in very special cases. */
4115 init = decay_conversion (init);
4117 /* Convert INIT to the reference type TYPE. This may involve the
4118 creation of a temporary, whose lifetime must be the same as that
4119 of the reference. If so, a DECL_EXPR for the temporary will be
4120 added just after the DECL_EXPR for DECL. That's why we don't set
4121 DECL_INITIAL for local references (instead assigning to them
4122 explicitly); we need to allow the temporary to be initialized
4124 tmp = initialize_reference (type, init, decl, cleanup);
4126 if (tmp == error_mark_node)
4128 else if (tmp == NULL_TREE)
4130 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4134 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4137 DECL_INITIAL (decl) = tmp;
4142 /* Designated initializers in arrays are not supported in GNU C++.
4143 The parser cannot detect this error since it does not know whether
4144 a given brace-enclosed initializer is for a class type or for an
4145 array. This function checks that CE does not use a designated
4146 initializer. If it does, an error is issued. Returns true if CE
4147 is valid, i.e., does not have a designated initializer. */
4150 check_array_designated_initializer (const constructor_elt *ce)
4152 /* Designated initializers for array elements are not supported. */
4155 /* The parser only allows identifiers as designated
4157 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4158 error ("name %qD used in a GNU-style designated "
4159 "initializer for an array", ce->index);
4166 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4167 array until we finish parsing the initializer. If that's the
4168 situation we're in, update DECL accordingly. */
4171 maybe_deduce_size_from_array_init (tree decl, tree init)
4173 tree type = TREE_TYPE (decl);
4175 if (TREE_CODE (type) == ARRAY_TYPE
4176 && TYPE_DOMAIN (type) == NULL_TREE
4177 && TREE_CODE (decl) != TYPE_DECL)
4179 /* do_default is really a C-ism to deal with tentative definitions.
4180 But let's leave it here to ease the eventual merge. */
4181 int do_default = !DECL_EXTERNAL (decl);
4182 tree initializer = init ? init : DECL_INITIAL (decl);
4185 /* Check that there are no designated initializers in INIT, as
4186 those are not supported in GNU C++, and as the middle-end
4187 will crash if presented with a non-numeric designated
4189 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4191 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4192 constructor_elt *ce;
4195 VEC_iterate (constructor_elt, v, i, ce);
4197 if (!check_array_designated_initializer (ce))
4203 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4207 error ("initializer fails to determine size of %qD", decl);
4208 TREE_TYPE (decl) = error_mark_node;
4210 else if (failure == 2)
4214 error ("array size missing in %qD", decl);
4215 TREE_TYPE (decl) = error_mark_node;
4217 /* If a `static' var's size isn't known, make it extern as
4218 well as static, so it does not get allocated. If it's not
4219 `static', then don't mark it extern; finish_incomplete_decl
4220 will give it a default size and it will get allocated. */
4221 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4222 DECL_EXTERNAL (decl) = 1;
4224 else if (failure == 3)
4226 error ("zero-size array %qD", decl);
4227 TREE_TYPE (decl) = error_mark_node;
4231 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4233 layout_decl (decl, 0);
4237 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4238 any appropriate error messages regarding the layout. */
4241 layout_var_decl (tree decl)
4245 type = TREE_TYPE (decl);
4246 if (type == error_mark_node)
4249 /* If we haven't already layed out this declaration, do so now.
4250 Note that we must not call complete type for an external object
4251 because it's type might involve templates that we are not
4252 supposed to instantiate yet. (And it's perfectly valid to say
4253 `extern X x' for some incomplete type `X'.) */
4254 if (!DECL_EXTERNAL (decl))
4255 complete_type (type);
4256 if (!DECL_SIZE (decl)
4257 && TREE_TYPE (decl) != error_mark_node
4258 && (COMPLETE_TYPE_P (type)
4259 || (TREE_CODE (type) == ARRAY_TYPE
4260 && !TYPE_DOMAIN (type)
4261 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4262 layout_decl (decl, 0);
4264 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4266 /* An automatic variable with an incomplete type: that is an error.
4267 Don't talk about array types here, since we took care of that
4268 message in grokdeclarator. */
4269 error ("storage size of %qD isn't known", decl);
4270 TREE_TYPE (decl) = error_mark_node;
4273 /* Keep this code around in case we later want to control debug info
4274 based on whether a type is "used". (jason 1999-11-11) */
4276 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4277 /* Let debugger know it should output info for this type. */
4278 note_debug_info_needed (ttype);
4280 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4281 note_debug_info_needed (DECL_CONTEXT (decl));
4284 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4285 && DECL_SIZE (decl) != NULL_TREE
4286 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4288 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4289 constant_expression_warning (DECL_SIZE (decl));
4291 error ("storage size of %qD isn't constant", decl);
4295 /* If a local static variable is declared in an inline function, or if
4296 we have a weak definition, we must endeavor to create only one
4297 instance of the variable at link-time. */
4300 maybe_commonize_var (tree decl)
4302 /* Static data in a function with comdat linkage also has comdat
4304 if (TREE_STATIC (decl)
4305 /* Don't mess with __FUNCTION__. */
4306 && ! DECL_ARTIFICIAL (decl)
4307 && DECL_FUNCTION_SCOPE_P (decl)
4308 /* Unfortunately, import_export_decl has not always been called
4309 before the function is processed, so we cannot simply check
4311 && (DECL_COMDAT (DECL_CONTEXT (decl))
4312 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4313 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4314 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4318 /* With weak symbols, we simply make the variable COMDAT;
4319 that will cause copies in multiple translations units to
4321 comdat_linkage (decl);
4325 if (DECL_INITIAL (decl) == NULL_TREE
4326 || DECL_INITIAL (decl) == error_mark_node)
4328 /* Without weak symbols, we can use COMMON to merge
4329 uninitialized variables. */
4330 TREE_PUBLIC (decl) = 1;
4331 DECL_COMMON (decl) = 1;
4335 /* While for initialized variables, we must use internal
4336 linkage -- which means that multiple copies will not
4338 TREE_PUBLIC (decl) = 0;
4339 DECL_COMMON (decl) = 0;
4340 warning (0, "sorry: semantics of inline function static "
4341 "data %q+#D are wrong (you'll wind up "
4342 "with multiple copies)", decl);
4343 warning (0, "%J you can work around this by removing "
4349 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4350 /* Set it up again; we might have set DECL_INITIAL since the last
4352 comdat_linkage (decl);
4355 /* Issue an error message if DECL is an uninitialized const variable. */
4358 check_for_uninitialized_const_var (tree decl)
4360 tree type = TREE_TYPE (decl);
4362 /* ``Unless explicitly declared extern, a const object does not have
4363 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4365 if (TREE_CODE (decl) == VAR_DECL
4366 && TREE_CODE (type) != REFERENCE_TYPE
4367 && CP_TYPE_CONST_P (type)
4368 && !TYPE_NEEDS_CONSTRUCTING (type)
4369 && !DECL_INITIAL (decl))
4370 error ("uninitialized const %qD", decl);
4374 /* Structure holding the current initializer being processed by reshape_init.
4375 CUR is a pointer to the current element being processed, END is a pointer
4376 after the last element present in the initializer. */
4377 typedef struct reshape_iterator_t
4379 constructor_elt *cur;
4380 constructor_elt *end;
4383 static tree reshape_init_r (tree, reshape_iter *, bool);
4385 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4386 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4387 initialized. If there are no more such fields, the return value
4391 next_initializable_field (tree field)
4394 && (TREE_CODE (field) != FIELD_DECL
4395 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4396 || DECL_ARTIFICIAL (field)))
4397 field = TREE_CHAIN (field);
4402 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4403 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4404 INTEGER_CST representing the size of the array minus one (the maximum index),
4405 or NULL_TREE if the array was declared without specifying the size. D is
4406 the iterator within the constructor. */
4409 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4412 bool sized_array_p = (max_index != NULL_TREE);
4413 unsigned HOST_WIDE_INT max_index_cst = 0;
4414 unsigned HOST_WIDE_INT index;
4416 /* The initializer for an array is always a CONSTRUCTOR. */
4417 new_init = build_constructor (NULL_TREE, NULL);
4421 /* Minus 1 is used for zero sized arrays. */
4422 if (integer_all_onesp (max_index))
4425 if (host_integerp (max_index, 1))
4426 max_index_cst = tree_low_cst (max_index, 1);
4427 /* sizetype is sign extended, not zero extended. */
4429 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4433 /* Loop until there are no more initializers. */
4435 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4440 check_array_designated_initializer (d->cur);
4441 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4442 if (elt_init == error_mark_node)
4443 return error_mark_node;
4444 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4450 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4451 Parameters are the same of reshape_init_r. */
4454 reshape_init_array (tree type, reshape_iter *d)
4456 tree max_index = NULL_TREE;
4458 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4460 if (TYPE_DOMAIN (type))
4461 max_index = array_type_nelts (type);
4463 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4466 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4467 Parameters are the same of reshape_init_r. */
4470 reshape_init_vector (tree type, reshape_iter *d)
4472 tree max_index = NULL_TREE;
4475 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4477 if (COMPOUND_LITERAL_P (d->cur->value))
4479 tree value = d->cur->value;
4480 if (!same_type_p (TREE_TYPE (value), type))
4482 error ("invalid type %qT as initializer for a vector of type %qT",
4483 TREE_TYPE (d->cur->value), type);
4484 value = error_mark_node;
4490 /* For a vector, the representation type is a struct
4491 containing a single member which is an array of the
4492 appropriate size. */
4493 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4494 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4495 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4497 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4500 /* Subroutine of reshape_init_r, processes the initializers for classes
4501 or union. Parameters are the same of reshape_init_r. */
4504 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4509 gcc_assert (CLASS_TYPE_P (type));
4511 /* The initializer for a class is always a CONSTRUCTOR. */
4512 new_init = build_constructor (NULL_TREE, NULL);
4513 field = next_initializable_field (TYPE_FIELDS (type));
4519 An initializer for an aggregate member that is an
4520 empty class shall have the form of an empty
4521 initializer-list {}. */
4522 if (!first_initializer_p)
4524 error ("initializer for %qT must be brace-enclosed", type);
4525 return error_mark_node;
4530 /* Loop through the initializable fields, gathering initializers. */
4531 while (d->cur != d->end)
4535 /* Handle designated initializers, as an extension. */
4538 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4540 if (!field || TREE_CODE (field) != FIELD_DECL)
4542 error ("%qT has no non-static data member named %qD", type,
4544 return error_mark_node;
4548 /* If we processed all the member of the class, we are done. */
4552 field_init = reshape_init_r (TREE_TYPE (field), d,
4553 /*first_initializer_p=*/false);
4554 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4558 When a union is initialized with a brace-enclosed
4559 initializer, the braces shall only contain an
4560 initializer for the first member of the union. */
4561 if (TREE_CODE (type) == UNION_TYPE)
4564 field = next_initializable_field (TREE_CHAIN (field));
4570 /* Subroutine of reshape_init, which processes a single initializer (part of
4571 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4572 iterator within the CONSTRUCTOR which points to the initializer to process.
4573 FIRST_INITIALIZER_P is true if this is the first initializer of the
4574 CONSTRUCTOR node. */
4577 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4579 tree init = d->cur->value;
4581 /* A non-aggregate type is always initialized with a single
4583 if (!CP_AGGREGATE_TYPE_P (type))
4585 /* It is invalid to initialize a non-aggregate type with a
4586 brace-enclosed initializer.
4587 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4588 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4589 a CONSTRUCTOR (with a record type). */
4590 if (TREE_CODE (init) == CONSTRUCTOR
4591 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4593 error ("braces around scalar initializer for type %qT", type);
4594 init = error_mark_node;
4603 All implicit type conversions (clause _conv_) are considered when
4604 initializing the aggregate member with an initializer from an
4605 initializer-list. If the initializer can initialize a member,
4606 the member is initialized. Otherwise, if the member is itself a
4607 non-empty subaggregate, brace elision is assumed and the
4608 initializer is considered for the initialization of the first
4609 member of the subaggregate. */
4610 if (TREE_CODE (init) != CONSTRUCTOR
4611 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4617 /* [dcl.init.string]
4619 A char array (whether plain char, signed char, or unsigned char)
4620 can be initialized by a string-literal (optionally enclosed in
4621 braces); a wchar_t array can be initialized by a wide
4622 string-literal (optionally enclosed in braces). */
4623 if (TREE_CODE (type) == ARRAY_TYPE
4624 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4626 tree str_init = init;
4628 /* Strip one level of braces if and only if they enclose a single
4629 element (as allowed by [dcl.init.string]). */
4630 if (!first_initializer_p
4631 && TREE_CODE (str_init) == CONSTRUCTOR
4632 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4634 str_init = VEC_index (constructor_elt,
4635 CONSTRUCTOR_ELTS (str_init), 0)->value;
4638 /* If it's a string literal, then it's the initializer for the array
4639 as a whole. Otherwise, continue with normal initialization for
4640 array types (one value per array element). */
4641 if (TREE_CODE (str_init) == STRING_CST)
4648 /* The following cases are about aggregates. If we are not within a full
4649 initializer already, and there is not a CONSTRUCTOR, it means that there
4650 is a missing set of braces (that is, we are processing the case for
4651 which reshape_init exists). */
4652 if (!first_initializer_p)
4654 if (TREE_CODE (init) == CONSTRUCTOR)
4656 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4657 /* There is no need to reshape pointer-to-member function
4658 initializers, as they are always constructed correctly
4659 by the front end. */
4661 else if (COMPOUND_LITERAL_P (init))
4662 /* For a nested compound literal, there is no need to reshape since
4663 brace elision is not allowed. Even if we decided to allow it,
4664 we should add a call to reshape_init in finish_compound_literal,
4665 before calling digest_init, so changing this code would still
4666 not be necessary. */
4667 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4671 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4672 return reshape_init (type, init);
4676 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4680 /* Dispatch to specialized routines. */
4681 if (CLASS_TYPE_P (type))
4682 return reshape_init_class (type, d, first_initializer_p);
4683 else if (TREE_CODE (type) == ARRAY_TYPE)
4684 return reshape_init_array (type, d);
4685 else if (TREE_CODE (type) == VECTOR_TYPE)
4686 return reshape_init_vector (type, d);
4691 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4692 brace-enclosed aggregate initializer.
4694 INIT is the CONSTRUCTOR containing the list of initializers describing
4695 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4696 It may not presently match the shape of the TYPE; for example:
4698 struct S { int a; int b; };
4699 struct S a[] = { 1, 2, 3, 4 };
4701 Here INIT will hold a VEC of four elements, rather than a
4702 VEC of two elements, each itself a VEC of two elements. This
4703 routine transforms INIT from the former form into the latter. The
4704 revised CONSTRUCTOR node is returned. */
4707 reshape_init (tree type, tree init)
4709 VEC(constructor_elt, gc) *v;
4713 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4715 v = CONSTRUCTOR_ELTS (init);
4717 /* An empty constructor does not need reshaping, and it is always a valid
4719 if (VEC_empty (constructor_elt, v))
4722 /* Recurse on this CONSTRUCTOR. */
4723 d.cur = VEC_index (constructor_elt, v, 0);
4724 d.end = d.cur + VEC_length (constructor_elt, v);
4726 new_init = reshape_init_r (type, &d, true);
4727 if (new_init == error_mark_node)
4728 return error_mark_node;
4730 /* Make sure all the element of the constructor were used. Otherwise,
4731 issue an error about exceeding initializers. */
4733 error ("too many initializers for %qT", type);
4738 /* Verify INIT (the initializer for DECL), and record the
4739 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4740 grok_reference_init.
4742 If the return value is non-NULL, it is an expression that must be
4743 evaluated dynamically to initialize DECL. */
4746 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4748 tree type = TREE_TYPE (decl);
4749 tree init_code = NULL;
4751 /* Things that are going to be initialized need to have complete
4753 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4755 if (type == error_mark_node)
4756 /* We will have already complained. */
4759 if (TREE_CODE (type) == ARRAY_TYPE)
4761 tree element_type = TREE_TYPE (type);
4763 /* The array type itself need not be complete, because the
4764 initializer may tell us how many elements are in the array.
4765 But, the elements of the array must be complete. */
4766 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4768 error ("elements of array %q#D have incomplete type", decl);
4771 /* It is not valid to initialize a VLA. */
4773 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4774 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4776 error ("variable-sized object %qD may not be initialized", decl);
4780 else if (!COMPLETE_TYPE_P (type))
4782 error ("%qD has incomplete type", decl);
4783 TREE_TYPE (decl) = error_mark_node;
4787 /* There is no way to make a variable-sized class type in GNU C++. */
4788 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4790 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4792 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4793 if (SCALAR_TYPE_P (type))
4797 error ("scalar object %qD requires one element in initializer",
4799 TREE_TYPE (decl) = error_mark_node;
4803 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4805 /* A non-aggregate that is not a scalar cannot be initialized
4806 via an initializer-list in C++98. */
4807 error ("braces around initializer for non-aggregate type %qT",
4809 TREE_TYPE (decl) = error_mark_node;
4814 if (TREE_CODE (decl) == CONST_DECL)
4816 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4818 DECL_INITIAL (decl) = init;
4820 gcc_assert (init != NULL_TREE);
4823 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4824 init = grok_reference_init (decl, type, init, cleanup);
4827 /* Do not reshape constructors of vectors (they don't need to be
4829 if (TREE_CODE (init) == CONSTRUCTOR
4830 && !COMPOUND_LITERAL_P (init)
4831 && !TREE_TYPE (init)) /* ptrmemfunc */
4833 init = reshape_init (type, init);
4835 if ((*targetm.vector_opaque_p) (type))
4837 error ("opaque vector types cannot be initialized");
4838 init = error_mark_node;
4842 /* If DECL has an array type without a specific bound, deduce the
4843 array size from the initializer. */
4844 maybe_deduce_size_from_array_init (decl, init);
4845 type = TREE_TYPE (decl);
4846 if (type == error_mark_node)
4849 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4851 if (TREE_CODE (type) == ARRAY_TYPE)
4852 goto initialize_aggr;
4853 else if (TREE_CODE (init) == CONSTRUCTOR)
4855 if (TYPE_NON_AGGREGATE_CLASS (type))
4857 error ("%qD must be initialized by constructor, "
4860 init = error_mark_node;
4863 goto dont_use_constructor;
4867 int saved_stmts_are_full_exprs_p;
4870 saved_stmts_are_full_exprs_p = 0;
4871 if (building_stmt_tree ())
4873 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4874 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4876 init = build_aggr_init (decl, init, flags);
4877 if (building_stmt_tree ())
4878 current_stmt_tree ()->stmts_are_full_exprs_p =
4879 saved_stmts_are_full_exprs_p;
4885 dont_use_constructor:
4886 if (TREE_CODE (init) != TREE_VEC)
4888 init_code = store_init_value (decl, init);
4889 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4890 && DECL_INITIAL (decl)
4891 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4892 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4893 warning (0, "array %qD initialized by parenthesized string literal %qE",
4894 decl, DECL_INITIAL (decl));
4899 else if (DECL_EXTERNAL (decl))
4901 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4902 goto initialize_aggr;
4903 else if (IS_AGGR_TYPE (type))
4905 tree core_type = strip_array_types (type);
4907 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4908 error ("structure %qD with uninitialized const members", decl);
4909 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4910 error ("structure %qD with uninitialized reference members", decl);
4912 check_for_uninitialized_const_var (decl);
4915 check_for_uninitialized_const_var (decl);
4917 if (init && init != error_mark_node)
4918 init_code = build2 (INIT_EXPR, type, decl, init);
4923 /* If DECL is not a local variable, give it RTL. */
4926 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4928 int toplev = toplevel_bindings_p ();
4930 const char *filename;
4932 /* Set the DECL_ASSEMBLER_NAME for the object. */
4935 /* The `register' keyword, when used together with an
4936 asm-specification, indicates that the variable should be
4937 placed in a particular register. */
4938 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4940 set_user_assembler_name (decl, asmspec);
4941 DECL_HARD_REGISTER (decl) = 1;
4945 if (TREE_CODE (decl) == FUNCTION_DECL
4946 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4947 set_builtin_user_assembler_name (decl, asmspec);
4948 set_user_assembler_name (decl, asmspec);
4952 /* Handle non-variables up front. */
4953 if (TREE_CODE (decl) != VAR_DECL)
4955 rest_of_decl_compilation (decl, toplev, at_eof);
4959 /* If we see a class member here, it should be a static data
4961 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4963 gcc_assert (TREE_STATIC (decl));
4964 /* An in-class declaration of a static data member should be
4965 external; it is only a declaration, and not a definition. */
4966 if (init == NULL_TREE)
4967 gcc_assert (DECL_EXTERNAL (decl));
4970 /* We don't create any RTL for local variables. */
4971 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4974 /* We defer emission of local statics until the corresponding
4975 DECL_EXPR is expanded. */
4976 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4978 /* We try to defer namespace-scope static constants so that they are
4979 not emitted into the object file unnecessarily. */
4980 filename = input_filename;
4981 if (!DECL_VIRTUAL_P (decl)
4982 && TREE_READONLY (decl)
4983 && DECL_INITIAL (decl) != NULL_TREE
4984 && DECL_INITIAL (decl) != error_mark_node
4986 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4988 && !TREE_PUBLIC (decl))
4990 /* Fool with the linkage of static consts according to #pragma
4992 struct c_fileinfo *finfo = get_fileinfo (filename);
4993 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4995 TREE_PUBLIC (decl) = 1;
4996 DECL_EXTERNAL (decl) = finfo->interface_only;
5001 /* Likewise for template instantiations. */
5002 else if (DECL_LANG_SPECIFIC (decl)
5003 && DECL_IMPLICIT_INSTANTIATION (decl))
5006 /* If we're not deferring, go ahead and assemble the variable. */
5008 rest_of_decl_compilation (decl, toplev, at_eof);
5011 /* Generate code to initialize DECL (a local variable). */
5014 initialize_local_var (tree decl, tree init)
5016 tree type = TREE_TYPE (decl);
5019 gcc_assert (TREE_CODE (decl) == VAR_DECL
5020 || TREE_CODE (decl) == RESULT_DECL);
5021 gcc_assert (!TREE_STATIC (decl));
5023 if (DECL_SIZE (decl) == NULL_TREE)
5025 /* If we used it already as memory, it must stay in memory. */
5026 DECL_INITIAL (decl) = NULL_TREE;
5027 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5030 if (DECL_SIZE (decl) && type != error_mark_node)
5034 /* Compute and store the initial value. */
5035 already_used = TREE_USED (decl) || TREE_USED (type);
5037 /* Perform the initialization. */
5040 int saved_stmts_are_full_exprs_p;
5042 gcc_assert (building_stmt_tree ());
5043 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5044 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5045 finish_expr_stmt (init);
5046 current_stmt_tree ()->stmts_are_full_exprs_p =
5047 saved_stmts_are_full_exprs_p;
5050 /* Set this to 0 so we can tell whether an aggregate which was
5051 initialized was ever used. Don't do this if it has a
5052 destructor, so we don't complain about the 'resource
5053 allocation is initialization' idiom. Now set
5054 attribute((unused)) on types so decls of that type will be
5055 marked used. (see TREE_USED, above.) */
5056 if (TYPE_NEEDS_CONSTRUCTING (type)
5058 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5059 && DECL_NAME (decl))
5060 TREE_USED (decl) = 0;
5061 else if (already_used)
5062 TREE_USED (decl) = 1;
5065 /* Generate a cleanup, if necessary. */
5066 cleanup = cxx_maybe_build_cleanup (decl);
5067 if (DECL_SIZE (decl) && cleanup)
5068 finish_decl_cleanup (decl, cleanup);
5071 /* DECL is a VAR_DECL for a compiler-generated variable with static
5072 storage duration (like a virtual table) whose initializer is a
5073 compile-time constant. INIT must be either a TREE_LIST of values,
5074 or a CONSTRUCTOR. Initialize the variable and provide it to the
5078 initialize_artificial_var (tree decl, tree init)
5080 gcc_assert (DECL_ARTIFICIAL (decl));
5081 if (TREE_CODE (init) == TREE_LIST)
5082 init = build_constructor_from_list (NULL_TREE, init);
5083 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5084 DECL_INITIAL (decl) = init;
5085 DECL_INITIALIZED_P (decl) = 1;
5086 determine_visibility (decl);
5087 layout_var_decl (decl);
5088 maybe_commonize_var (decl);
5089 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5092 /* INIT is the initializer for a variable, as represented by the
5093 parser. Returns true iff INIT is value-dependent. */
5096 value_dependent_init_p (tree init)
5098 if (TREE_CODE (init) == TREE_LIST)
5099 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5100 return any_value_dependent_elements_p (init);
5101 else if (TREE_CODE (init) == CONSTRUCTOR)
5102 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5104 VEC(constructor_elt, gc) *elts;
5108 elts = CONSTRUCTOR_ELTS (init);
5109 nelts = VEC_length (constructor_elt, elts);
5110 for (i = 0; i < nelts; ++i)
5111 if (value_dependent_init_p (VEC_index (constructor_elt,
5116 /* It must be a simple expression, e.g., int i = 3; */
5117 return value_dependent_expression_p (init);
5122 /* Finish processing of a declaration;
5123 install its line number and initial value.
5124 If the length of an array type is not known before,
5125 it must be determined now, from the initial value, or it is an error.
5127 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5128 true, then INIT is an integral constant expression.
5130 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5131 if the (init) syntax was used. */
5134 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5135 tree asmspec_tree, int flags)
5139 const char *asmspec = NULL;
5140 int was_readonly = 0;
5141 bool var_definition_p = false;
5142 int saved_processing_template_decl;
5144 if (decl == error_mark_node)
5149 error ("assignment (not initialization) in declaration");
5153 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5154 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5155 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5157 type = TREE_TYPE (decl);
5158 if (type == error_mark_node)
5161 /* Assume no cleanup is required. */
5162 cleanup = NULL_TREE;
5163 saved_processing_template_decl = processing_template_decl;
5165 /* If a name was specified, get the string. */
5166 if (global_scope_p (current_binding_level))
5167 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5168 if (asmspec_tree && asmspec_tree != error_mark_node)
5169 asmspec = TREE_STRING_POINTER (asmspec_tree);
5171 if (current_class_type
5172 && CP_DECL_CONTEXT (decl) == current_class_type
5173 && TYPE_BEING_DEFINED (current_class_type)
5174 && (DECL_INITIAL (decl) || init))
5175 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5177 if (processing_template_decl)
5179 bool type_dependent_p;
5181 /* Add this declaration to the statement-tree. */
5182 if (at_function_scope_p ())
5183 add_decl_expr (decl);
5185 type_dependent_p = dependent_type_p (type);
5187 if (init && init_const_expr_p)
5189 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5190 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5191 TREE_CONSTANT (decl) = 1;
5194 /* Generally, initializers in templates are expanded when the
5195 template is instantiated. But, if DECL is an integral
5196 constant static data member, then it can be used in future
5197 integral constant expressions, and its value must be
5200 && DECL_CLASS_SCOPE_P (decl)
5201 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5202 && !type_dependent_p
5203 && !value_dependent_init_p (init)))
5206 DECL_INITIAL (decl) = init;
5207 if (TREE_CODE (decl) == VAR_DECL
5208 && !DECL_PRETTY_FUNCTION_P (decl)
5209 && !type_dependent_p)
5210 maybe_deduce_size_from_array_init (decl, init);
5214 init = fold_non_dependent_expr (init);
5215 processing_template_decl = 0;
5218 /* Take care of TYPE_DECLs up front. */
5219 if (TREE_CODE (decl) == TYPE_DECL)
5221 if (type != error_mark_node
5222 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5224 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5225 warning (0, "shadowing previous type declaration of %q#D", decl);
5226 set_identifier_type_value (DECL_NAME (decl), decl);
5229 /* If we have installed this as the canonical typedef for this
5230 type, and that type has not been defined yet, delay emitting
5231 the debug information for it, as we will emit it later. */
5232 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5233 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5234 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5236 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5241 /* A reference will be modified here, as it is initialized. */
5242 if (! DECL_EXTERNAL (decl)
5243 && TREE_READONLY (decl)
5244 && TREE_CODE (type) == REFERENCE_TYPE)
5247 TREE_READONLY (decl) = 0;
5250 if (TREE_CODE (decl) == VAR_DECL)
5252 /* Only PODs can have thread-local storage. Other types may require
5253 various kinds of non-trivial initialization. */
5254 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5255 error ("%qD cannot be thread-local because it has non-POD type %qT",
5256 decl, TREE_TYPE (decl));
5257 /* If this is a local variable that will need a mangled name,
5258 register it now. We must do this before processing the
5259 initializer for the variable, since the initialization might
5260 require a guard variable, and since the mangled name of the
5261 guard variable will depend on the mangled name of this
5263 if (!processing_template_decl
5264 && DECL_FUNCTION_SCOPE_P (decl)
5265 && TREE_STATIC (decl)
5266 && !DECL_ARTIFICIAL (decl))
5267 push_local_name (decl);
5268 /* Convert the initializer to the type of DECL, if we have not
5269 already initialized DECL. */
5270 if (!DECL_INITIALIZED_P (decl)
5271 /* If !DECL_EXTERNAL then DECL is being defined. In the
5272 case of a static data member initialized inside the
5273 class-specifier, there can be an initializer even if DECL
5274 is *not* defined. */
5275 && (!DECL_EXTERNAL (decl) || init))
5279 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5280 if (init_const_expr_p)
5282 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5283 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5284 TREE_CONSTANT (decl) = 1;
5287 init = check_initializer (decl, init, flags, &cleanup);
5288 /* Thread-local storage cannot be dynamically initialized. */
5289 if (DECL_THREAD_LOCAL_P (decl) && init)
5291 error ("%qD is thread-local and so cannot be dynamically "
5292 "initialized", decl);
5296 /* Check that the initializer for a static data member was a
5297 constant. Although we check in the parser that the
5298 initializer is an integral constant expression, we do not
5299 simplify division-by-zero at the point at which it
5300 occurs. Therefore, in:
5302 struct S { static const int i = 7 / 0; };
5304 we issue an error at this point. It would
5305 probably be better to forbid division by zero in
5306 integral constant expressions. */
5307 if (DECL_EXTERNAL (decl) && init)
5309 error ("%qD cannot be initialized by a non-constant expression"
5310 " when being declared", decl);
5311 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5319 The memory occupied by any object of static storage
5320 duration is zero-initialized at program startup before
5321 any other initialization takes place.
5323 We cannot create an appropriate initializer until after
5324 the type of DECL is finalized. If DECL_INITIAL is set,
5325 then the DECL is statically initialized, and any
5326 necessary zero-initialization has already been performed. */
5327 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5328 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5329 /*nelts=*/NULL_TREE,
5330 /*static_storage_p=*/true);
5331 /* Remember that the initialization for this variable has
5333 DECL_INITIALIZED_P (decl) = 1;
5334 /* This declaration is the definition of this variable,
5335 unless we are initializing a static data member within
5336 the class specifier. */
5337 if (!DECL_EXTERNAL (decl))
5338 var_definition_p = true;
5340 /* If the variable has an array type, lay out the type, even if
5341 there is no initializer. It is valid to index through the
5342 array, and we must get TYPE_ALIGN set correctly on the array
5344 else if (TREE_CODE (type) == ARRAY_TYPE)
5348 /* Add this declaration to the statement-tree. This needs to happen
5349 after the call to check_initializer so that the DECL_EXPR for a
5350 reference temp is added before the DECL_EXPR for the reference itself. */
5351 if (at_function_scope_p ())
5352 add_decl_expr (decl);
5354 /* Let the middle end know about variables and functions -- but not
5355 static data members in uninstantiated class templates. */
5356 if (!saved_processing_template_decl
5357 && (TREE_CODE (decl) == VAR_DECL
5358 || TREE_CODE (decl) == FUNCTION_DECL))
5360 if (TREE_CODE (decl) == VAR_DECL)
5362 layout_var_decl (decl);
5363 maybe_commonize_var (decl);
5366 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5368 /* Check for abstractness of the type. Notice that there is no
5369 need to strip array types here since the check for those types
5370 is already done within create_array_type_for_decl. */
5371 if (TREE_CODE (type) == FUNCTION_TYPE
5372 || TREE_CODE (type) == METHOD_TYPE)
5373 abstract_virtuals_error (decl, TREE_TYPE (type));
5375 abstract_virtuals_error (decl, type);
5377 /* This needs to happen after the linkage is set. */
5378 determine_visibility (decl);
5380 if (TREE_CODE (decl) == FUNCTION_DECL
5381 || TREE_TYPE (decl) == error_mark_node)
5382 /* No initialization required. */
5384 else if (DECL_EXTERNAL (decl)
5385 && ! (DECL_LANG_SPECIFIC (decl)
5386 && DECL_NOT_REALLY_EXTERN (decl)))
5389 DECL_INITIAL (decl) = init;
5393 /* A variable definition. */
5394 if (DECL_FUNCTION_SCOPE_P (decl))
5396 /* Initialize the local variable. */
5397 if (processing_template_decl)
5398 DECL_INITIAL (decl) = init;
5399 else if (!TREE_STATIC (decl))
5400 initialize_local_var (decl, init);
5403 /* If a variable is defined, and then a subsequent
5404 definition with external linkage is encountered, we will
5405 get here twice for the same variable. We want to avoid
5406 calling expand_static_init more than once. For variables
5407 that are not static data members, we can call
5408 expand_static_init only when we actually process the
5409 initializer. It is not legal to redeclare a static data
5410 member, so this issue does not arise in that case. */
5411 if (var_definition_p && TREE_STATIC (decl))
5413 /* If a TREE_READONLY variable needs initialization
5414 at runtime, it is no longer readonly and we need to
5415 avoid MEM_READONLY_P being set on RTL created for it. */
5418 if (TREE_READONLY (decl))
5419 TREE_READONLY (decl) = 0;
5422 expand_static_init (decl, init);
5427 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5428 reference, insert it in the statement-tree now. */
5430 push_cleanup (decl, cleanup, false);
5433 processing_template_decl = saved_processing_template_decl;
5436 TREE_READONLY (decl) = 1;
5438 /* If this was marked 'used', be sure it will be output. */
5439 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5440 mark_decl_referenced (decl);
5443 /* This is here for a midend callback from c-common.c. */
5446 finish_decl (tree decl, tree init, tree asmspec_tree)
5448 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5451 /* Returns a declaration for a VAR_DECL as if:
5453 extern "C" TYPE NAME;
5455 had been seen. Used to create compiler-generated global
5459 declare_global_var (tree name, tree type)
5463 push_to_top_level ();
5464 decl = build_decl (VAR_DECL, name, type);
5465 TREE_PUBLIC (decl) = 1;
5466 DECL_EXTERNAL (decl) = 1;
5467 DECL_ARTIFICIAL (decl) = 1;
5468 /* If the user has explicitly declared this variable (perhaps
5469 because the code we are compiling is part of a low-level runtime
5470 library), then it is possible that our declaration will be merged
5471 with theirs by pushdecl. */
5472 decl = pushdecl (decl);
5473 finish_decl (decl, NULL_TREE, NULL_TREE);
5474 pop_from_top_level ();
5479 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5480 if "__cxa_atexit" is not being used) corresponding to the function
5481 to be called when the program exits. */
5484 get_atexit_fn_ptr_type (void)
5489 if (!atexit_fn_ptr_type_node)
5491 if (flag_use_cxa_atexit
5492 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5493 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5494 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5496 /* The parameter to "atexit" is "void (*)(void)". */
5497 arg_types = void_list_node;
5499 fn_type = build_function_type (void_type_node, arg_types);
5500 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5503 return atexit_fn_ptr_type_node;
5506 /* Returns a pointer to the `atexit' function. Note that if
5507 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5508 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5511 get_atexit_node (void)
5518 bool use_aeabi_atexit;
5523 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5525 /* The declaration for `__cxa_atexit' is:
5527 int __cxa_atexit (void (*)(void *), void *, void *)
5529 We build up the argument types and then then function type
5532 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5533 /* First, build the pointer-to-function type for the first
5535 fn_ptr_type = get_atexit_fn_ptr_type ();
5536 /* Then, build the rest of the argument types. */
5537 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5538 if (use_aeabi_atexit)
5540 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5541 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5545 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5546 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5548 /* And the final __cxa_atexit type. */
5549 fn_type = build_function_type (integer_type_node, arg_types);
5550 fn_ptr_type = build_pointer_type (fn_type);
5551 if (use_aeabi_atexit)
5552 name = "__aeabi_atexit";
5554 name = "__cxa_atexit";
5558 /* The declaration for `atexit' is:
5560 int atexit (void (*)());
5562 We build up the argument types and then then function type
5564 fn_ptr_type = get_atexit_fn_ptr_type ();
5565 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5566 /* Build the final atexit type. */
5567 fn_type = build_function_type (integer_type_node, arg_types);
5571 /* Now, build the function declaration. */
5572 push_lang_context (lang_name_c);
5573 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5574 mark_used (atexit_fndecl);
5575 pop_lang_context ();
5576 atexit_node = decay_conversion (atexit_fndecl);
5581 /* Returns the __dso_handle VAR_DECL. */
5584 get_dso_handle_node (void)
5586 if (dso_handle_node)
5587 return dso_handle_node;
5589 /* Declare the variable. */
5590 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5593 return dso_handle_node;
5596 /* Begin a new function with internal linkage whose job will be simply
5597 to destroy some particular variable. */
5599 static GTY(()) int start_cleanup_cnt;
5602 start_cleanup_fn (void)
5607 bool use_cxa_atexit = flag_use_cxa_atexit
5608 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5610 push_to_top_level ();
5612 /* No need to mangle this. */
5613 push_lang_context (lang_name_c);
5615 /* Build the name of the function. */
5616 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5617 /* Build the function declaration. */
5618 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5619 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5620 /* It's a function with internal linkage, generated by the
5622 TREE_PUBLIC (fndecl) = 0;
5623 DECL_ARTIFICIAL (fndecl) = 1;
5624 /* Make the function `inline' so that it is only emitted if it is
5625 actually needed. It is unlikely that it will be inlined, since
5626 it is only called via a function pointer, but we avoid unnecessary
5627 emissions this way. */
5628 DECL_INLINE (fndecl) = 1;
5629 DECL_DECLARED_INLINE_P (fndecl) = 1;
5630 DECL_INTERFACE_KNOWN (fndecl) = 1;
5631 /* Build the parameter. */
5636 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5637 DECL_CONTEXT (parmdecl) = fndecl;
5638 TREE_USED (parmdecl) = 1;
5639 DECL_ARGUMENTS (fndecl) = parmdecl;
5643 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5645 pop_lang_context ();
5647 return current_function_decl;
5650 /* Finish the cleanup function begun by start_cleanup_fn. */
5653 end_cleanup_fn (void)
5655 expand_or_defer_fn (finish_function (0));
5657 pop_from_top_level ();
5660 /* Generate code to handle the destruction of DECL, an object with
5661 static storage duration. */
5664 register_dtor_fn (tree decl)
5673 type = TREE_TYPE (decl);
5674 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5675 return void_zero_node;
5677 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5678 a class object, we can just pass the destructor to
5679 "__cxa_atexit"; we don't have to build a temporary function to do
5681 use_dtor = (flag_use_cxa_atexit
5682 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5683 && CLASS_TYPE_P (type));
5688 /* Find the destructor. */
5689 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5690 gcc_assert (idx >= 0);
5691 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5692 /* Make sure it is accessible. */
5693 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5697 /* Call build_cleanup before we enter the anonymous function so
5698 that any access checks will be done relative to the current
5699 scope, rather than the scope of the anonymous function. */
5700 build_cleanup (decl);
5702 /* Now start the function. */
5703 cleanup = start_cleanup_fn ();
5705 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5706 to the original function, rather than the anonymous one. That
5707 will make the back end think that nested functions are in use,
5708 which causes confusion. */
5709 push_deferring_access_checks (dk_no_check);
5710 fcall = build_cleanup (decl);
5711 pop_deferring_access_checks ();
5713 /* Create the body of the anonymous function. */
5714 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5715 finish_expr_stmt (fcall);
5716 finish_compound_stmt (compound_stmt);
5720 /* Call atexit with the cleanup function. */
5721 mark_used (cleanup);
5722 cleanup = build_address (cleanup);
5723 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5729 /* We must convert CLEANUP to the type that "__cxa_atexit"
5731 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5732 /* "__cxa_atexit" will pass the address of DECL to the
5733 cleanup function. */
5735 addr = build_address (decl);
5736 /* The declared type of the parameter to "__cxa_atexit" is
5737 "void *". For plain "T*", we could just let the
5738 machinery in build_function_call convert it -- but if the
5739 type is "cv-qualified T *", then we need to convert it
5740 before passing it in, to avoid spurious errors. */
5741 addr = build_nop (ptr_type_node, addr);
5744 /* Since the cleanup functions we build ignore the address
5745 they're given, there's no reason to pass the actual address
5746 in, and, in general, it's cheaper to pass NULL than any
5748 addr = null_pointer_node;
5749 args = tree_cons (NULL_TREE,
5750 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5752 if (targetm.cxx.use_aeabi_atexit ())
5754 args = tree_cons (NULL_TREE, cleanup, args);
5755 args = tree_cons (NULL_TREE, addr, args);
5759 args = tree_cons (NULL_TREE, addr, args);
5760 args = tree_cons (NULL_TREE, cleanup, args);
5764 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5765 return build_function_call (get_atexit_node (), args);
5768 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5769 is its initializer. Generate code to handle the construction
5770 and destruction of DECL. */
5773 expand_static_init (tree decl, tree init)
5775 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5776 gcc_assert (TREE_STATIC (decl));
5778 /* Some variables require no initialization. */
5780 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5781 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5784 if (DECL_FUNCTION_SCOPE_P (decl))
5786 /* Emit code to perform this initialization but once. */
5787 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5788 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5789 tree guard, guard_addr;
5790 tree acquire_fn, release_fn, abort_fn;
5793 /* Emit code to perform this initialization but once. This code
5796 static <type> guard;
5797 if (!guard.first_byte) {
5798 if (__cxa_guard_acquire (&guard)) {
5801 // Do initialization.
5802 flag = true; __cxa_guard_release (&guard);
5803 // Register variable for destruction at end of program.
5805 if (!flag) __cxa_guard_abort (&guard);
5809 Note that the `flag' variable is only set to 1 *after* the
5810 initialization is complete. This ensures that an exception,
5811 thrown during the construction, will cause the variable to
5812 reinitialized when we pass through this code again, as per:
5816 If the initialization exits by throwing an exception, the
5817 initialization is not complete, so it will be tried again
5818 the next time control enters the declaration.
5820 This process should be thread-safe, too; multiple threads
5821 should not be able to initialize the variable more than
5824 /* Create the guard variable. */
5825 guard = get_guard (decl);
5827 /* This optimization isn't safe on targets with relaxed memory
5828 consistency. On such targets we force synchronization in
5829 __cxa_guard_acquire. */
5830 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5832 /* Begin the conditional initialization. */
5833 if_stmt = begin_if_stmt ();
5834 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5835 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5838 if (flag_threadsafe_statics)
5840 guard_addr = build_address (guard);
5842 acquire_fn = get_identifier ("__cxa_guard_acquire");
5843 release_fn = get_identifier ("__cxa_guard_release");
5844 abort_fn = get_identifier ("__cxa_guard_abort");
5845 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5847 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5849 tree vfntype = build_function_type (void_type_node, argtypes);
5850 acquire_fn = push_library_fn
5851 (acquire_fn, build_function_type (integer_type_node, argtypes));
5852 release_fn = push_library_fn (release_fn, vfntype);
5853 abort_fn = push_library_fn (abort_fn, vfntype);
5857 release_fn = identifier_global_value (release_fn);
5858 abort_fn = identifier_global_value (abort_fn);
5861 inner_if_stmt = begin_if_stmt ();
5862 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
5865 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5866 begin = get_target_expr (boolean_false_node);
5867 flag = TARGET_EXPR_SLOT (begin);
5869 TARGET_EXPR_CLEANUP (begin)
5870 = build3 (COND_EXPR, void_type_node, flag,
5872 build_call_n (abort_fn, 1, guard_addr));
5873 CLEANUP_EH_ONLY (begin) = 1;
5875 /* Do the initialization itself. */
5876 init = add_stmt_to_compound (begin, init);
5877 init = add_stmt_to_compound
5878 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5879 init = add_stmt_to_compound
5880 (init, build_call_n (release_fn, 1, guard_addr));
5883 init = add_stmt_to_compound (init, set_guard (guard));
5885 /* Use atexit to register a function for destroying this static
5887 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5889 finish_expr_stmt (init);
5891 if (flag_threadsafe_statics)
5893 finish_compound_stmt (inner_then_clause);
5894 finish_then_clause (inner_if_stmt);
5895 finish_if_stmt (inner_if_stmt);
5898 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5900 finish_compound_stmt (then_clause);
5901 finish_then_clause (if_stmt);
5902 finish_if_stmt (if_stmt);
5906 static_aggregates = tree_cons (init, decl, static_aggregates);
5910 /* Make TYPE a complete type based on INITIAL_VALUE.
5911 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5912 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5913 3 if the initializer list is empty (in pedantic mode). */
5916 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5919 tree type, elt_type;
5923 /* An array of character type can be initialized from a
5924 brace-enclosed string constant.
5926 FIXME: this code is duplicated from reshape_init. Probably
5927 we should just call reshape_init here? */
5928 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5929 && TREE_CODE (initial_value) == CONSTRUCTOR
5930 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5932 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5933 tree value = VEC_index (constructor_elt, v, 0)->value;
5935 if (TREE_CODE (value) == STRING_CST
5936 && VEC_length (constructor_elt, v) == 1)
5937 initial_value = value;
5941 failure = complete_array_type (ptype, initial_value, do_default);
5943 /* We can create the array before the element type is complete, which
5944 means that we didn't have these two bits set in the original type
5945 either. In completing the type, we are expected to propagate these
5946 bits. See also complete_type which does the same thing for arrays
5949 if (TYPE_DOMAIN (type))
5951 elt_type = TREE_TYPE (type);
5952 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5953 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5954 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5960 /* Return zero if something is declared to be a member of type
5961 CTYPE when in the context of CUR_TYPE. STRING is the error
5962 message to print in that case. Otherwise, quietly return 1. */
5965 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5967 if (ctype && ctype != cur_type)
5969 if (flags == DTOR_FLAG)
5970 error ("destructor for alien class %qT cannot be a member", ctype);
5972 error ("constructor for alien class %qT cannot be a member", ctype);
5978 /* Subroutine of `grokdeclarator'. */
5980 /* Generate errors possibly applicable for a given set of specifiers.
5981 This is for ARM $7.1.2. */
5984 bad_specifiers (tree object,
5993 error ("%qD declared as a %<virtual%> %s", object, type);
5995 error ("%qD declared as an %<inline%> %s", object, type);
5997 error ("%<const%> and %<volatile%> function specifiers on "
5998 "%qD invalid in %s declaration",
6001 error ("%q+D declared as a friend", object);
6003 && (TREE_CODE (object) == TYPE_DECL
6004 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6005 && !TYPE_REFFN_P (TREE_TYPE (object))
6006 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6007 error ("%q+D declared with an exception specification", object);
6010 /* DECL is a member function or static data member and is presently
6011 being defined. Check that the definition is taking place in a
6015 check_class_member_definition_namespace (tree decl)
6017 /* These checks only apply to member functions and static data
6019 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6020 || TREE_CODE (decl) == VAR_DECL);
6021 /* We check for problems with specializations in pt.c in
6022 check_specialization_namespace, where we can issue better
6024 if (processing_specialization)
6026 /* There are no restrictions on the placement of
6027 explicit instantiations. */
6028 if (processing_explicit_instantiation)
6032 A member function definition that appears outside of the
6033 class definition shall appear in a namespace scope enclosing
6034 the class definition.
6038 The definition for a static data member shall appear in a
6039 namespace scope enclosing the member's class definition. */
6040 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6041 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6042 decl, DECL_CONTEXT (decl));
6045 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6046 METHOD_TYPE for a non-static member function; QUALS are the
6047 cv-qualifiers that apply to the function. */
6050 build_this_parm (tree type, cp_cv_quals quals)
6055 cp_cv_quals this_quals;
6057 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6058 /* The `this' parameter is implicitly `const'; it cannot be
6060 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6061 qual_type = cp_build_qualified_type (this_type, this_quals);
6062 parm = build_artificial_parm (this_identifier, qual_type);
6063 cp_apply_type_quals_to_decl (this_quals, parm);
6067 /* CTYPE is class type, or null if non-class.
6068 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6070 DECLARATOR is the function's name.
6071 PARMS is a chain of PARM_DECLs for the function.
6072 VIRTUALP is truthvalue of whether the function is virtual or not.
6073 FLAGS are to be passed through to `grokclassfn'.
6074 QUALS are qualifiers indicating whether the function is `const'
6076 RAISES is a list of exceptions that this function can raise.
6077 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6078 not look, and -1 if we should not call `grokclassfn' at all.
6080 SFK is the kind of special function (if any) for the new function.
6082 Returns `NULL_TREE' if something goes wrong, after issuing
6083 applicable error messages. */
6086 grokfndecl (tree ctype,
6090 tree orig_declarator,
6092 enum overload_flags flags,
6099 special_function_kind sfk,
6106 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6110 type = build_exception_variant (type, raises);
6112 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6113 if (TREE_CODE (type) == METHOD_TYPE)
6116 parm = build_this_parm (type, quals);
6117 TREE_CHAIN (parm) = parms;
6120 DECL_ARGUMENTS (decl) = parms;
6121 /* Propagate volatile out from type to decl. */
6122 if (TYPE_VOLATILE (type))
6123 TREE_THIS_VOLATILE (decl) = 1;
6125 /* Setup decl according to sfk. */
6128 case sfk_constructor:
6129 case sfk_copy_constructor:
6130 DECL_CONSTRUCTOR_P (decl) = 1;
6132 case sfk_destructor:
6133 DECL_DESTRUCTOR_P (decl) = 1;
6139 /* If pointers to member functions use the least significant bit to
6140 indicate whether a function is virtual, ensure a pointer
6141 to this function will have that bit clear. */
6142 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6143 && TREE_CODE (type) == METHOD_TYPE
6144 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6145 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6148 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6152 ("defining explicit specialization %qD in friend declaration",
6156 tree fns = TREE_OPERAND (orig_declarator, 0);
6157 tree args = TREE_OPERAND (orig_declarator, 1);
6159 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6161 /* Something like `template <class T> friend void f<T>()'. */
6162 error ("invalid use of template-id %qD in declaration "
6163 "of primary template",
6169 /* A friend declaration of the form friend void f<>(). Record
6170 the information in the TEMPLATE_ID_EXPR. */
6171 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6173 if (TREE_CODE (fns) == COMPONENT_REF)
6175 /* Due to bison parser ickiness, we will have already looked
6176 up an operator_name or PFUNCNAME within the current class
6177 (see template_id in parse.y). If the current class contains
6178 such a name, we'll get a COMPONENT_REF here. Undo that. */
6180 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6181 == current_class_type);
6182 fns = TREE_OPERAND (fns, 1);
6184 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6185 || TREE_CODE (fns) == OVERLOAD);
6186 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6188 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6189 if (TREE_PURPOSE (t)
6190 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6192 error ("default arguments are not allowed in declaration "
6193 "of friend template specialization %qD",
6200 error ("%<inline%> is not allowed in declaration of friend "
6201 "template specialization %qD",
6208 /* If this decl has namespace scope, set that up. */
6210 set_decl_namespace (decl, in_namespace, friendp);
6212 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6214 /* `main' and builtins have implicit 'C' linkage. */
6215 if ((MAIN_NAME_P (declarator)
6216 || (IDENTIFIER_LENGTH (declarator) > 10
6217 && IDENTIFIER_POINTER (declarator)[0] == '_'
6218 && IDENTIFIER_POINTER (declarator)[1] == '_'
6219 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6220 && current_lang_name == lang_name_cplusplus
6221 && ctype == NULL_TREE
6222 /* NULL_TREE means global namespace. */
6223 && DECL_CONTEXT (decl) == NULL_TREE)
6224 SET_DECL_LANGUAGE (decl, lang_c);
6226 /* Should probably propagate const out from type to decl I bet (mrs). */
6229 DECL_STATIC_FUNCTION_P (decl) = 1;
6230 DECL_CONTEXT (decl) = ctype;
6235 DECL_CONTEXT (decl) = ctype;
6237 check_class_member_definition_namespace (decl);
6240 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6242 if (processing_template_decl)
6243 error ("cannot declare %<::main%> to be a template");
6245 error ("cannot declare %<::main%> to be inline");
6247 error ("cannot declare %<::main%> to be static");
6252 /* Members of anonymous types and local classes have no linkage; make
6253 them internal. If a typedef is made later, this will be changed. */
6254 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6255 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6260 /* [basic.link]: A name with no linkage (notably, the name of a class
6261 or enumeration declared in a local scope) shall not be used to
6262 declare an entity with linkage.
6264 Only check this for public decls for now. See core 319, 389. */
6265 t = no_linkage_check (TREE_TYPE (decl),
6266 /*relaxed_p=*/false);
6269 if (TYPE_ANONYMOUS_P (t))
6271 if (DECL_EXTERN_C_P (decl))
6272 /* Allow this; it's pretty common in C. */;
6275 pedwarn ("non-local function %q#D uses anonymous type",
6277 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6278 pedwarn ("%q+#D does not refer to the unqualified "
6279 "type, so it is not used for linkage",
6284 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6288 TREE_PUBLIC (decl) = publicp;
6291 DECL_INTERFACE_KNOWN (decl) = 1;
6292 DECL_NOT_REALLY_EXTERN (decl) = 1;
6295 /* If the declaration was declared inline, mark it as such. */
6297 DECL_DECLARED_INLINE_P (decl) = 1;
6298 /* We inline functions that are explicitly declared inline, or, when
6299 the user explicitly asks us to, all functions. */
6300 if (DECL_DECLARED_INLINE_P (decl)
6301 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6302 DECL_INLINE (decl) = 1;
6304 DECL_EXTERNAL (decl) = 1;
6305 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6308 ? G_("static member function %qD cannot have cv-qualifier")
6309 : G_("non-member function %qD cannot have cv-qualifier"),
6311 quals = TYPE_UNQUALIFIED;
6314 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6315 && !grok_op_properties (decl, /*complain=*/true))
6318 if (ctype && decl_function_context (decl))
6319 DECL_NO_STATIC_CHAIN (decl) = 1;
6322 /* Make the init_value nonzero so pushdecl knows this is not
6323 tentative. error_mark_node is replaced later with the BLOCK. */
6324 DECL_INITIAL (decl) = error_mark_node;
6326 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6327 TREE_NOTHROW (decl) = 1;
6329 /* Caller will do the rest of this. */
6333 if (ctype != NULL_TREE)
6334 grokclassfn (ctype, decl, flags);
6336 decl = check_explicit_specialization (orig_declarator, decl,
6339 4 * (friendp != 0));
6340 if (decl == error_mark_node)
6345 cplus_decl_attributes (&decl, *attrlist, 0);
6346 *attrlist = NULL_TREE;
6349 /* Check main's type after attributes have been applied. */
6350 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6352 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6355 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6357 error ("%<::main%> must return %<int%>");
6358 newtype = build_function_type (integer_type_node, oldtypeargs);
6359 TREE_TYPE (decl) = newtype;
6361 check_main_parameter_types (decl);
6364 if (ctype != NULL_TREE
6365 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6370 old_decl = check_classfn (ctype, decl,
6371 (processing_template_decl
6372 > template_class_depth (ctype))
6373 ? current_template_parms
6380 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6381 /* Because grokfndecl is always supposed to return a
6382 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6383 here. We depend on our callers to figure out that its
6384 really a template that's being returned. */
6385 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6387 if (DECL_STATIC_FUNCTION_P (old_decl)
6388 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6389 /* Remove the `this' parm added by grokclassfn.
6390 XXX Isn't this done in start_function, too? */
6391 revert_static_member_fn (decl);
6392 if (DECL_ARTIFICIAL (old_decl))
6393 error ("definition of implicitly-declared %qD", old_decl);
6395 /* Since we've smashed OLD_DECL to its
6396 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6397 if (TREE_CODE (decl) == TEMPLATE_DECL)
6398 decl = DECL_TEMPLATE_RESULT (decl);
6400 /* Attempt to merge the declarations. This can fail, in
6401 the case of some invalid specialization declarations. */
6402 pushed_scope = push_scope (ctype);
6403 ok = duplicate_decls (decl, old_decl, friendp);
6405 pop_scope (pushed_scope);
6408 error ("no %q#D member function declared in class %qT",
6416 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6419 if (ctype == NULL_TREE || check)
6423 DECL_VIRTUAL_P (decl) = 1;
6428 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6429 the linkage that DECL will receive in the object file. */
6432 set_linkage_for_static_data_member (tree decl)
6434 /* A static data member always has static storage duration and
6435 external linkage. Note that static data members are forbidden in
6436 local classes -- the only situation in which a class has
6437 non-external linkage. */
6438 TREE_PUBLIC (decl) = 1;
6439 TREE_STATIC (decl) = 1;
6440 /* For non-template classes, static data members are always put
6441 out in exactly those files where they are defined, just as
6442 with ordinary namespace-scope variables. */
6443 if (!processing_template_decl)
6444 DECL_INTERFACE_KNOWN (decl) = 1;
6447 /* Create a VAR_DECL named NAME with the indicated TYPE.
6449 If SCOPE is non-NULL, it is the class type or namespace containing
6450 the variable. If SCOPE is NULL, the variable should is created in
6451 the innermost enclosings scope. */
6454 grokvardecl (tree type,
6456 const cp_decl_specifier_seq *declspecs,
6462 tree explicit_scope;
6464 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6466 /* Compute the scope in which to place the variable, but remember
6467 whether or not that scope was explicitly specified by the user. */
6468 explicit_scope = scope;
6471 /* An explicit "extern" specifier indicates a namespace-scope
6473 if (declspecs->storage_class == sc_extern)
6474 scope = current_namespace;
6475 else if (!at_function_scope_p ())
6476 scope = current_scope ();
6480 && (/* If the variable is a namespace-scope variable declared in a
6481 template, we need DECL_LANG_SPECIFIC. */
6482 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6483 /* Similarly for namespace-scope variables with language linkage
6485 || (TREE_CODE (scope) == NAMESPACE_DECL
6486 && current_lang_name != lang_name_cplusplus)
6487 /* Similarly for static data members. */
6489 decl = build_lang_decl (VAR_DECL, name, type);
6491 decl = build_decl (VAR_DECL, name, type);
6493 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6494 set_decl_namespace (decl, explicit_scope, 0);
6496 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6498 if (declspecs->storage_class == sc_extern)
6500 DECL_THIS_EXTERN (decl) = 1;
6501 DECL_EXTERNAL (decl) = !initialized;
6504 if (DECL_CLASS_SCOPE_P (decl))
6506 set_linkage_for_static_data_member (decl);
6507 /* This function is only called with out-of-class definitions. */
6508 DECL_EXTERNAL (decl) = 0;
6509 check_class_member_definition_namespace (decl);
6511 /* At top level, either `static' or no s.c. makes a definition
6512 (perhaps tentative), and absence of `static' makes it public. */
6513 else if (toplevel_bindings_p ())
6515 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6516 && (DECL_THIS_EXTERN (decl) || ! constp));
6517 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6519 /* Not at top level, only `static' makes a static definition. */
6522 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6523 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6526 if (declspecs->specs[(int)ds_thread])
6527 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6529 if (TREE_PUBLIC (decl))
6531 /* [basic.link]: A name with no linkage (notably, the name of a class
6532 or enumeration declared in a local scope) shall not be used to
6533 declare an entity with linkage.
6535 Only check this for public decls for now. */
6536 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6539 if (TYPE_ANONYMOUS_P (t))
6541 if (DECL_EXTERN_C_P (decl))
6542 /* Allow this; it's pretty common in C. */
6546 /* DRs 132, 319 and 389 seem to indicate types with
6547 no linkage can only be used to declare extern "C"
6548 entities. Since it's not always an error in the
6549 ISO C++ 90 Standard, we only issue a warning. */
6550 warning (0, "non-local variable %q#D uses anonymous type",
6552 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6553 warning (0, "%q+#D does not refer to the unqualified "
6554 "type, so it is not used for linkage",
6559 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6563 DECL_INTERFACE_KNOWN (decl) = 1;
6568 /* Create and return a canonical pointer to member function type, for
6569 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6572 build_ptrmemfunc_type (tree type)
6576 tree unqualified_variant = NULL_TREE;
6578 if (type == error_mark_node)
6581 /* If a canonical type already exists for this type, use it. We use
6582 this method instead of type_hash_canon, because it only does a
6583 simple equality check on the list of field members. */
6585 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6588 /* Make sure that we always have the unqualified pointer-to-member
6590 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6592 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6594 t = make_aggr_type (RECORD_TYPE);
6595 xref_basetypes (t, NULL_TREE);
6597 /* Let the front end know this is a pointer to member function... */
6598 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6599 /* ... and not really an aggregate. */
6600 SET_IS_AGGR_TYPE (t, 0);
6602 field = build_decl (FIELD_DECL, pfn_identifier, type);
6605 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6606 TREE_CHAIN (field) = fields;
6609 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6611 /* Zap out the name so that the back end will give us the debugging
6612 information for this anonymous RECORD_TYPE. */
6613 TYPE_NAME (t) = NULL_TREE;
6615 /* If this is not the unqualified form of this pointer-to-member
6616 type, set the TYPE_MAIN_VARIANT for this type to be the
6617 unqualified type. Since they are actually RECORD_TYPEs that are
6618 not variants of each other, we must do this manually. */
6619 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6621 t = build_qualified_type (t, cp_type_quals (type));
6622 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6623 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6624 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6627 /* Cache this pointer-to-member type so that we can find it again
6629 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6631 /* Managing canonical types for the RECORD_TYPE behind a
6632 pointer-to-member function is a nightmare, so use structural
6633 equality for now. */
6634 SET_TYPE_STRUCTURAL_EQUALITY (t);
6639 /* Create and return a pointer to data member type. */
6642 build_ptrmem_type (tree class_type, tree member_type)
6644 if (TREE_CODE (member_type) == METHOD_TYPE)
6648 arg_types = TYPE_ARG_TYPES (member_type);
6649 class_type = (cp_build_qualified_type
6651 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6653 = build_method_type_directly (class_type,
6654 TREE_TYPE (member_type),
6655 TREE_CHAIN (arg_types));
6656 return build_ptrmemfunc_type (build_pointer_type (member_type));
6660 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6661 return build_offset_type (class_type, member_type);
6665 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6666 Check to see that the definition is valid. Issue appropriate error
6667 messages. Return 1 if the definition is particularly bad, or 0
6671 check_static_variable_definition (tree decl, tree type)
6673 /* Motion 10 at San Diego: If a static const integral data member is
6674 initialized with an integral constant expression, the initializer
6675 may appear either in the declaration (within the class), or in
6676 the definition, but not both. If it appears in the class, the
6677 member is a member constant. The file-scope definition is always
6679 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6681 error ("invalid in-class initialization of static data member "
6682 "of non-integral type %qT",
6684 /* If we just return the declaration, crashes will sometimes
6685 occur. We therefore return void_type_node, as if this were a
6686 friend declaration, to cause callers to completely ignore
6687 this declaration. */
6690 else if (!CP_TYPE_CONST_P (type))
6691 error ("ISO C++ forbids in-class initialization of non-const "
6692 "static member %qD",
6694 else if (pedantic && !INTEGRAL_TYPE_P (type))
6695 pedwarn ("ISO C++ forbids initialization of member constant "
6696 "%qD of non-integral type %qT", decl, type);
6701 /* Given the SIZE (i.e., number of elements) in an array, compute an
6702 appropriate index type for the array. If non-NULL, NAME is the
6703 name of the thing being declared. */
6706 compute_array_index_type (tree name, tree size)
6710 tree abi_1_itype = NULL_TREE;
6712 if (error_operand_p (size))
6713 return error_mark_node;
6715 type = TREE_TYPE (size);
6716 /* The array bound must be an integer type. */
6717 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6720 error ("size of array %qD has non-integral type %qT", name, type);
6722 error ("size of array has non-integral type %qT", type);
6723 size = integer_one_node;
6724 type = TREE_TYPE (size);
6727 if (value_dependent_expression_p (size))
6729 /* We cannot do any checking for a value-dependent SIZE. Just
6730 build the index type and mark that it requires structural
6732 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6733 size, integer_one_node));
6734 SET_TYPE_STRUCTURAL_EQUALITY (itype);
6738 if (!abi_version_at_least (2) && processing_template_decl)
6739 /* For abi-1, we handled all instances in templates the same way,
6740 even when they were non-dependent. This effects the manglings
6741 produced. So, we do the normal checking for non-dependent
6742 sizes, but at the end we'll return the same type that abi-1
6743 would have, but with TYPE_CANONICAL set to the "right"
6744 value that the current ABI would provide. */
6745 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6746 size, integer_one_node));
6748 /* The size might be the result of a cast. */
6749 STRIP_TYPE_NOPS (size);
6751 /* It might be a const variable or enumeration constant. */
6752 size = integral_constant_value (size);
6754 /* Normally, the array-bound will be a constant. */
6755 if (TREE_CODE (size) == INTEGER_CST)
6757 /* Check to see if the array bound overflowed. Make that an
6758 error, no matter how generous we're being. */
6759 int old_flag_pedantic_errors = flag_pedantic_errors;
6760 int old_pedantic = pedantic;
6761 pedantic = flag_pedantic_errors = 1;
6762 constant_expression_warning (size);
6763 pedantic = old_pedantic;
6764 flag_pedantic_errors = old_flag_pedantic_errors;
6766 /* An array must have a positive number of elements. */
6767 if (INT_CST_LT (size, integer_zero_node))
6770 error ("size of array %qD is negative", name);
6772 error ("size of array is negative");
6773 size = integer_one_node;
6775 /* As an extension we allow zero-sized arrays. We always allow
6776 them in system headers because glibc uses them. */
6777 else if (integer_zerop (size) && pedantic && !in_system_header)
6780 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6782 pedwarn ("ISO C++ forbids zero-size array");
6785 else if (TREE_CONSTANT (size))
6787 /* `(int) &fn' is not a valid array bound. */
6789 error ("size of array %qD is not an integral constant-expression",
6792 error ("size of array is not an integral constant-expression");
6793 size = integer_one_node;
6795 else if (pedantic && warn_vla != 0)
6798 pedwarn ("ISO C++ forbids variable length array %qD", name);
6800 pedwarn ("ISO C++ forbids variable length array");
6802 else if (warn_vla > 0)
6806 "variable length array %qD is used", name);
6809 "variable length array is used");
6812 if (processing_template_decl && !TREE_CONSTANT (size))
6813 /* A variable sized array. */
6814 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6817 HOST_WIDE_INT saved_processing_template_decl;
6819 /* Compute the index of the largest element in the array. It is
6820 one less than the number of elements in the array. We save
6821 and restore PROCESSING_TEMPLATE_DECL so that computations in
6822 cp_build_binary_op will be appropriately folded. */
6823 saved_processing_template_decl = processing_template_decl;
6824 processing_template_decl = 0;
6825 itype = cp_build_binary_op (MINUS_EXPR,
6826 cp_convert (ssizetype, size),
6827 cp_convert (ssizetype, integer_one_node));
6828 itype = fold (itype);
6829 processing_template_decl = saved_processing_template_decl;
6831 if (!TREE_CONSTANT (itype))
6832 /* A variable sized array. */
6833 itype = variable_size (itype);
6834 /* Make sure that there was no overflow when creating to a signed
6835 index type. (For example, on a 32-bit machine, an array with
6836 size 2^32 - 1 is too big.) */
6837 else if (TREE_CODE (itype) == INTEGER_CST
6838 && TREE_OVERFLOW (itype))
6840 error ("overflow in array dimension");
6841 TREE_OVERFLOW (itype) = 0;
6845 /* Create and return the appropriate index type. */
6848 tree t = build_index_type (itype);
6849 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
6853 return build_index_type (itype);
6856 /* Returns the scope (if any) in which the entity declared by
6857 DECLARATOR will be located. If the entity was declared with an
6858 unqualified name, NULL_TREE is returned. */
6861 get_scope_of_declarator (const cp_declarator *declarator)
6863 while (declarator && declarator->kind != cdk_id)
6864 declarator = declarator->declarator;
6866 /* If the declarator-id is a SCOPE_REF, the scope in which the
6867 declaration occurs is the first operand. */
6869 && declarator->u.id.qualifying_scope)
6870 return declarator->u.id.qualifying_scope;
6872 /* Otherwise, the declarator is not a qualified name; the entity will
6873 be declared in the current scope. */
6877 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6878 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6882 create_array_type_for_decl (tree name, tree type, tree size)
6884 tree itype = NULL_TREE;
6885 const char* error_msg;
6887 /* If things have already gone awry, bail now. */
6888 if (type == error_mark_node || size == error_mark_node)
6889 return error_mark_node;
6891 /* Assume that everything will go OK. */
6894 /* There are some types which cannot be array elements. */
6895 switch (TREE_CODE (type))
6898 error_msg = "array of void";
6902 error_msg = "array of functions";
6905 case REFERENCE_TYPE:
6906 error_msg = "array of references";
6910 error_msg = "array of function members";
6917 /* If something went wrong, issue an error-message and return. */
6921 error ("declaration of %qD as %s", name, error_msg);
6923 error ("creating %s", error_msg);
6925 return error_mark_node;
6930 The constant expressions that specify the bounds of the arrays
6931 can be omitted only for the first member of the sequence. */
6932 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6935 error ("declaration of %qD as multidimensional array must "
6936 "have bounds for all dimensions except the first",
6939 error ("multidimensional array must have bounds for all "
6940 "dimensions except the first");
6942 return error_mark_node;
6945 /* Figure out the index type for the array. */
6947 itype = compute_array_index_type (name, size);
6950 T is called the array element type; this type shall not be [...] an
6951 abstract class type. */
6952 abstract_virtuals_error (name, type);
6954 return build_cplus_array_type (type, itype);
6957 /* Check that it's OK to declare a function with the indicated TYPE.
6958 SFK indicates the kind of special function (if any) that this
6959 function is. OPTYPE is the type given in a conversion operator
6960 declaration, or the class type for a constructor/destructor.
6961 Returns the actual return type of the function; that
6962 may be different than TYPE if an error occurs, or for certain
6963 special functions. */
6966 check_special_function_return_type (special_function_kind sfk,
6972 case sfk_constructor:
6974 error ("return type specification for constructor invalid");
6976 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6977 type = build_pointer_type (optype);
6979 type = void_type_node;
6982 case sfk_destructor:
6984 error ("return type specification for destructor invalid");
6985 /* We can't use the proper return type here because we run into
6986 problems with ambiguous bases and covariant returns.
6987 Java classes are left unchanged because (void *) isn't a valid
6988 Java type, and we don't want to change the Java ABI. */
6989 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6990 type = build_pointer_type (void_type_node);
6992 type = void_type_node;
6995 case sfk_conversion:
6996 if (type && !same_type_p (type, optype))
6997 error ("operator %qT declared to return %qT", optype, type);
6999 pedwarn ("return type specified for %<operator %T%>", optype);
7010 /* A variable or data member (whose unqualified name is IDENTIFIER)
7011 has been declared with the indicated TYPE. If the TYPE is not
7012 acceptable, issue an error message and return a type to use for
7013 error-recovery purposes. */
7016 check_var_type (tree identifier, tree type)
7018 if (VOID_TYPE_P (type))
7021 error ("unnamed variable or field declared void");
7022 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7024 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7025 error ("variable or field %qE declared void", identifier);
7028 error ("variable or field declared void");
7029 type = error_mark_node;
7035 /* Given declspecs and a declarator (abstract or otherwise), determine
7036 the name and type of the object declared and construct a DECL node
7039 DECLSPECS points to the representation of declaration-specifier
7040 sequence that precedes declarator.
7042 DECL_CONTEXT says which syntactic context this declaration is in:
7043 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7044 FUNCDEF for a function definition. Like NORMAL but a few different
7045 error messages in each case. Return value may be zero meaning
7046 this definition is too screwy to try to parse.
7047 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7048 handle member functions (which have FIELD context).
7049 Return value may be zero meaning this definition is too screwy to
7051 PARM for a parameter declaration (either within a function prototype
7052 or before a function body). Make a PARM_DECL, or return void_type_node.
7053 CATCHPARM for a parameter declaration before a catch clause.
7054 TYPENAME if for a typename (in a cast or sizeof).
7055 Don't make a DECL node; just return the ..._TYPE node.
7056 FIELD for a struct or union field; make a FIELD_DECL.
7057 BITFIELD for a field with specified width.
7058 INITIALIZED is 1 if the decl has an initializer.
7060 ATTRLIST is a pointer to the list of attributes, which may be NULL
7061 if there are none; *ATTRLIST may be modified if attributes from inside
7062 the declarator should be applied to the declaration.
7064 When this function is called, scoping variables (such as
7065 CURRENT_CLASS_TYPE) should reflect the scope in which the
7066 declaration occurs, not the scope in which the new declaration will
7067 be placed. For example, on:
7071 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7074 Returns a DECL (if a declarator is present), a TYPE (if there is no
7075 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7079 grokdeclarator (const cp_declarator *declarator,
7080 const cp_decl_specifier_seq *declspecs,
7081 enum decl_context decl_context,
7085 tree type = NULL_TREE;
7087 int virtualp, explicitp, friendp, inlinep, staticp;
7088 int explicit_int = 0;
7089 int explicit_char = 0;
7090 int defaulted_int = 0;
7091 tree dependent_name = NULL_TREE;
7093 tree typedef_decl = NULL_TREE;
7094 const char *name = NULL;
7095 tree typedef_type = NULL_TREE;
7096 /* True if this declarator is a function definition. */
7097 bool funcdef_flag = false;
7098 cp_declarator_kind innermost_code = cdk_error;
7101 /* See the code below that used this. */
7102 tree decl_attr = NULL_TREE;
7105 /* Keep track of what sort of function is being processed
7106 so that we can warn about default return values, or explicit
7107 return values which do not match prescribed defaults. */
7108 special_function_kind sfk = sfk_none;
7110 tree dname = NULL_TREE;
7111 tree ctor_return_type = NULL_TREE;
7112 enum overload_flags flags = NO_SPECIAL;
7113 /* cv-qualifiers that apply to the declarator, for a declaration of
7114 a member function. */
7115 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7116 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7118 tree raises = NULL_TREE;
7119 int template_count = 0;
7120 tree returned_attrs = NULL_TREE;
7121 tree parms = NULL_TREE;
7122 const cp_declarator *id_declarator;
7123 /* The unqualified name of the declarator; either an
7124 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7125 tree unqualified_id;
7126 /* The class type, if any, in which this entity is located,
7127 or NULL_TREE if none. Note that this value may be different from
7128 the current class type; for example if an attempt is made to declare
7129 "A::f" inside "B", this value will be "A". */
7130 tree ctype = current_class_type;
7131 /* The NAMESPACE_DECL for the namespace in which this entity is
7132 located. If an unqualified name is used to declare the entity,
7133 this value will be NULL_TREE, even if the entity is located at
7135 tree in_namespace = NULL_TREE;
7136 cp_storage_class storage_class;
7137 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7138 bool type_was_error_mark_node = false;
7139 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7140 bool set_no_warning = false;
7142 signed_p = declspecs->specs[(int)ds_signed];
7143 unsigned_p = declspecs->specs[(int)ds_unsigned];
7144 short_p = declspecs->specs[(int)ds_short];
7145 long_p = declspecs->specs[(int)ds_long];
7146 longlong = declspecs->specs[(int)ds_long] >= 2;
7147 thread_p = declspecs->specs[(int)ds_thread];
7149 if (decl_context == FUNCDEF)
7150 funcdef_flag = true, decl_context = NORMAL;
7151 else if (decl_context == MEMFUNCDEF)
7152 funcdef_flag = true, decl_context = FIELD;
7153 else if (decl_context == BITFIELD)
7154 bitfield = 1, decl_context = FIELD;
7156 /* Look inside a declarator for the name being declared
7157 and get it as a string, for an error message. */
7158 for (id_declarator = declarator;
7160 id_declarator = id_declarator->declarator)
7162 if (id_declarator->kind != cdk_id)
7163 innermost_code = id_declarator->kind;
7165 switch (id_declarator->kind)
7168 if (id_declarator->declarator
7169 && id_declarator->declarator->kind == cdk_id)
7171 sfk = id_declarator->declarator->u.id.sfk;
7172 if (sfk == sfk_destructor)
7179 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7180 tree decl = id_declarator->u.id.unqualified_name;
7183 if (qualifying_scope)
7185 if (at_function_scope_p ())
7189 A declarator-id shall not be qualified except
7192 None of the cases are permitted in block
7194 if (qualifying_scope == global_namespace)
7195 error ("invalid use of qualified-name %<::%D%>",
7197 else if (TYPE_P (qualifying_scope))
7198 error ("invalid use of qualified-name %<%T::%D%>",
7199 qualifying_scope, decl);
7201 error ("invalid use of qualified-name %<%D::%D%>",
7202 qualifying_scope, decl);
7203 return error_mark_node;
7205 else if (TYPE_P (qualifying_scope))
7207 ctype = qualifying_scope;
7208 if (innermost_code != cdk_function
7209 && current_class_type
7210 && !UNIQUELY_DERIVED_FROM_P (ctype,
7211 current_class_type))
7213 error ("type %qT is not derived from type %qT",
7214 ctype, current_class_type);
7215 return error_mark_node;
7218 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7219 in_namespace = qualifying_scope;
7221 switch (TREE_CODE (decl))
7227 if (innermost_code != cdk_function)
7229 error ("declaration of %qD as non-function", decl);
7230 return error_mark_node;
7232 else if (!qualifying_scope
7233 && !(current_class_type && at_class_scope_p ()))
7235 error ("declaration of %qD as non-member", decl);
7236 return error_mark_node;
7239 type = TREE_OPERAND (decl, 0);
7240 name = IDENTIFIER_POINTER (constructor_name (type));
7245 case TEMPLATE_ID_EXPR:
7247 tree fns = TREE_OPERAND (decl, 0);
7250 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7252 gcc_assert (is_overloaded_fn (dname));
7253 dname = DECL_NAME (get_first_fn (dname));
7258 case IDENTIFIER_NODE:
7259 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7262 if (C_IS_RESERVED_WORD (dname))
7264 error ("declarator-id missing; using reserved word %qD",
7266 name = IDENTIFIER_POINTER (dname);
7268 else if (!IDENTIFIER_TYPENAME_P (dname))
7269 name = IDENTIFIER_POINTER (dname);
7272 gcc_assert (flags == NO_SPECIAL);
7273 flags = TYPENAME_FLAG;
7274 ctor_return_type = TREE_TYPE (dname);
7275 sfk = sfk_conversion;
7276 if (is_typename_at_global_scope (dname))
7277 name = IDENTIFIER_POINTER (dname);
7279 name = "<invalid operator>";
7296 return error_mark_node;
7301 if (id_declarator->kind == cdk_id)
7307 The declarator in a function-definition shall have the form
7308 D1 ( parameter-declaration-clause) ... */
7309 if (funcdef_flag && innermost_code != cdk_function)
7311 error ("function definition does not declare parameters");
7312 return error_mark_node;
7315 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7316 && innermost_code != cdk_function
7317 && ! (ctype && !declspecs->any_specifiers_p))
7319 error ("declaration of %qD as non-function", dname);
7320 return error_mark_node;
7323 /* Anything declared one level down from the top level
7324 must be one of the parameters of a function
7325 (because the body is at least two levels down). */
7327 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7328 by not allowing C++ class definitions to specify their parameters
7329 with xdecls (must be spec.d in the parmlist).
7331 Since we now wait to push a class scope until we are sure that
7332 we are in a legitimate method context, we must set oldcname
7333 explicitly (since current_class_name is not yet alive).
7335 We also want to avoid calling this a PARM if it is in a namespace. */
7337 if (decl_context == NORMAL && !toplevel_bindings_p ())
7339 struct cp_binding_level *b = current_binding_level;
7340 current_binding_level = b->level_chain;
7341 if (current_binding_level != 0 && toplevel_bindings_p ())
7342 decl_context = PARM;
7343 current_binding_level = b;
7347 name = decl_context == PARM ? "parameter" : "type name";
7349 /* If there were multiple types specified in the decl-specifier-seq,
7350 issue an error message. */
7351 if (declspecs->multiple_types_p)
7353 error ("two or more data types in declaration of %qs", name);
7354 return error_mark_node;
7357 /* Extract the basic type from the decl-specifier-seq. */
7358 type = declspecs->type;
7359 if (type == error_mark_node)
7362 type_was_error_mark_node = true;
7364 /* If the entire declaration is itself tagged as deprecated then
7365 suppress reports of deprecated items. */
7366 if (type && TREE_DEPRECATED (type)
7367 && deprecated_state != DEPRECATED_SUPPRESS)
7368 warn_deprecated_use (type);
7369 if (type && TREE_CODE (type) == TYPE_DECL)
7371 typedef_decl = type;
7372 type = TREE_TYPE (typedef_decl);
7374 /* No type at all: default to `int', and set DEFAULTED_INT
7375 because it was not a user-defined typedef. */
7376 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7378 /* These imply 'int'. */
7379 type = integer_type_node;
7383 explicit_int = declspecs->explicit_int_p;
7384 explicit_char = declspecs->explicit_char_p;
7387 /* See the code below that used this. */
7389 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7391 typedef_type = type;
7394 if (sfk != sfk_conversion)
7395 ctor_return_type = ctype;
7397 if (sfk != sfk_none)
7398 type = check_special_function_return_type (sfk, type,
7400 else if (type == NULL_TREE)
7406 /* We handle `main' specially here, because 'main () { }' is so
7407 common. With no options, it is allowed. With -Wreturn-type,
7408 it is a warning. It is only an error with -pedantic-errors. */
7409 is_main = (funcdef_flag
7410 && dname && MAIN_NAME_P (dname)
7411 && ctype == NULL_TREE
7412 && in_namespace == NULL_TREE
7413 && current_namespace == global_namespace);
7415 if (type_was_error_mark_node)
7416 /* We've already issued an error, don't complain more. */;
7417 else if (in_system_header || flag_ms_extensions)
7418 /* Allow it, sigh. */;
7419 else if (pedantic || ! is_main)
7420 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7422 warning (OPT_Wreturn_type,
7423 "ISO C++ forbids declaration of %qs with no type", name);
7425 type = integer_type_node;
7430 /* Now process the modifiers that were specified
7431 and check for invalid combinations. */
7433 /* Long double is a special combination. */
7434 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7437 type = build_qualified_type (long_double_type_node,
7438 cp_type_quals (type));
7441 /* Check all other uses of type modifiers. */
7443 if (unsigned_p || signed_p || long_p || short_p)
7447 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7448 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7449 else if (signed_p && unsigned_p)
7450 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7451 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7452 error ("%<long long%> invalid for %qs", name);
7453 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7454 error ("%<long%> invalid for %qs", name);
7455 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7456 error ("%<short%> invalid for %qs", name);
7457 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7458 error ("%<long%> or %<short%> invalid for %qs", name);
7459 else if ((long_p || short_p) && explicit_char)
7460 error ("%<long%> or %<short%> specified with char for %qs", name);
7461 else if (long_p && short_p)
7462 error ("%<long%> and %<short%> specified together for %qs", name);
7466 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7468 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7470 if (flag_pedantic_errors)
7475 /* Discard the type modifiers if they are invalid. */
7486 /* Decide whether an integer type is signed or not.
7487 Optionally treat bitfields as signed by default. */
7491 It is implementation-defined whether a plain (neither
7492 explicitly signed or unsigned) char, short, int, or long
7493 bit-field is signed or unsigned.
7495 Naturally, we extend this to long long as well. Note that
7496 this does not include wchar_t. */
7497 || (bitfield && !flag_signed_bitfields
7499 /* A typedef for plain `int' without `signed' can be
7500 controlled just like plain `int', but a typedef for
7501 `signed int' cannot be so controlled. */
7503 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7504 && TREE_CODE (type) == INTEGER_TYPE
7505 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7508 type = long_long_unsigned_type_node;
7510 type = long_unsigned_type_node;
7512 type = short_unsigned_type_node;
7513 else if (type == char_type_node)
7514 type = unsigned_char_type_node;
7515 else if (typedef_decl)
7516 type = unsigned_type_for (type);
7518 type = unsigned_type_node;
7520 else if (signed_p && type == char_type_node)
7521 type = signed_char_type_node;
7523 type = long_long_integer_type_node;
7525 type = long_integer_type_node;
7527 type = short_integer_type_node;
7529 if (declspecs->specs[(int)ds_complex])
7531 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7532 error ("complex invalid for %qs", name);
7533 /* If we just have "complex", it is equivalent to
7534 "complex double", but if any modifiers at all are specified it is
7535 the complex form of TYPE. E.g, "complex short" is
7536 "complex short int". */
7538 else if (defaulted_int && ! longlong
7539 && ! (long_p || short_p || signed_p || unsigned_p))
7540 type = complex_double_type_node;
7541 else if (type == integer_type_node)
7542 type = complex_integer_type_node;
7543 else if (type == float_type_node)
7544 type = complex_float_type_node;
7545 else if (type == double_type_node)
7546 type = complex_double_type_node;
7547 else if (type == long_double_type_node)
7548 type = complex_long_double_type_node;
7550 type = build_complex_type (type);
7553 type_quals = TYPE_UNQUALIFIED;
7554 if (declspecs->specs[(int)ds_const])
7555 type_quals |= TYPE_QUAL_CONST;
7556 if (declspecs->specs[(int)ds_volatile])
7557 type_quals |= TYPE_QUAL_VOLATILE;
7558 if (declspecs->specs[(int)ds_restrict])
7559 type_quals |= TYPE_QUAL_RESTRICT;
7560 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7561 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7564 if (TREE_CODE (type) == FUNCTION_TYPE
7565 && type_quals != TYPE_UNQUALIFIED)
7567 /* This was an error in C++98 (cv-qualifiers cannot be added to
7568 a function type), but DR 295 makes the code well-formed by
7569 dropping the extra qualifiers. */
7572 tree bad_type = build_qualified_type (type, type_quals);
7573 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7576 type_quals = TYPE_UNQUALIFIED;
7578 type_quals |= cp_type_quals (type);
7579 type = cp_build_qualified_type_real
7580 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7581 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7582 /* We might have ignored or rejected some of the qualifiers. */
7583 type_quals = cp_type_quals (type);
7586 inlinep = !! declspecs->specs[(int)ds_inline];
7587 virtualp = !! declspecs->specs[(int)ds_virtual];
7588 explicitp = !! declspecs->specs[(int)ds_explicit];
7590 storage_class = declspecs->storage_class;
7591 if (storage_class == sc_static)
7592 staticp = 1 + (decl_context == FIELD);
7594 if (virtualp && staticp == 2)
7596 error ("member %qD cannot be declared both virtual and static", dname);
7597 storage_class = sc_none;
7600 friendp = !! declspecs->specs[(int)ds_friend];
7602 if (dependent_name && !friendp)
7604 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7605 return error_mark_node;
7608 /* Issue errors about use of storage classes for parameters. */
7609 if (decl_context == PARM)
7611 if (declspecs->specs[(int)ds_typedef])
7613 error ("typedef declaration invalid in parameter declaration");
7614 return error_mark_node;
7616 else if (storage_class == sc_static
7617 || storage_class == sc_extern
7619 error ("storage class specifiers invalid in parameter declarations");
7622 /* Give error if `virtual' is used outside of class declaration. */
7624 && (current_class_name == NULL_TREE || decl_context != FIELD))
7626 error ("virtual outside class declaration");
7630 /* Static anonymous unions are dealt with here. */
7631 if (staticp && decl_context == TYPENAME
7633 && ANON_AGGR_TYPE_P (declspecs->type))
7634 decl_context = FIELD;
7636 /* Warn about storage classes that are invalid for certain
7637 kinds of declarations (parameters, typenames, etc.). */
7640 && storage_class != sc_extern
7641 && storage_class != sc_static)
7642 || declspecs->specs[(int)ds_typedef]))
7644 error ("multiple storage classes in declaration of %qs", name);
7647 if (declspecs->conflicting_specifiers_p)
7649 error ("conflicting specifiers in declaration of %qs", name);
7650 storage_class = sc_none;
7652 else if (decl_context != NORMAL
7653 && ((storage_class != sc_none
7654 && storage_class != sc_mutable)
7657 if ((decl_context == PARM || decl_context == CATCHPARM)
7658 && (storage_class == sc_register
7659 || storage_class == sc_auto))
7661 else if (declspecs->specs[(int)ds_typedef])
7663 else if (decl_context == FIELD
7664 /* C++ allows static class elements. */
7665 && storage_class == sc_static)
7666 /* C++ also allows inlines and signed and unsigned elements,
7667 but in those cases we don't come in here. */
7671 if (decl_context == FIELD)
7672 error ("storage class specified for %qs", name);
7675 if (decl_context == PARM || decl_context == CATCHPARM)
7676 error ("storage class specified for parameter %qs", name);
7678 error ("storage class specified for typename");
7680 if (storage_class == sc_register
7681 || storage_class == sc_auto
7682 || storage_class == sc_extern
7684 storage_class = sc_none;
7687 else if (storage_class == sc_extern && initialized
7690 if (toplevel_bindings_p ())
7692 /* It's common practice (and completely valid) to have a const
7693 be initialized and declared extern. */
7694 if (!(type_quals & TYPE_QUAL_CONST))
7695 warning (0, "%qs initialized and declared %<extern%>", name);
7698 error ("%qs has both %<extern%> and initializer", name);
7700 else if (storage_class == sc_extern && funcdef_flag
7701 && ! toplevel_bindings_p ())
7702 error ("nested function %qs declared %<extern%>", name);
7703 else if (toplevel_bindings_p ())
7705 if (storage_class == sc_auto)
7706 error ("top-level declaration of %qs specifies %<auto%>", name);
7709 && storage_class != sc_extern
7710 && storage_class != sc_static)
7712 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7717 if (storage_class && friendp)
7718 error ("storage class specifiers invalid in friend function declarations");
7721 unqualified_id = NULL_TREE;
7724 unqualified_id = id_declarator->u.id.unqualified_name;
7725 switch (TREE_CODE (unqualified_id))
7729 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7732 case IDENTIFIER_NODE:
7733 case TEMPLATE_ID_EXPR:
7741 /* Determine the type of the entity declared by recurring on the
7743 for (; declarator; declarator = declarator->declarator)
7745 const cp_declarator *inner_declarator;
7748 if (type == error_mark_node)
7749 return error_mark_node;
7751 attrs = declarator->attributes;
7757 if (declarator == NULL || declarator->kind == cdk_id)
7758 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7759 if (declarator->kind == cdk_function)
7760 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7761 if (declarator->kind == cdk_array)
7762 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7763 returned_attrs = decl_attributes (&type,
7764 chainon (returned_attrs, attrs),
7768 if (declarator->kind == cdk_id)
7771 inner_declarator = declarator->declarator;
7773 switch (declarator->kind)
7776 type = create_array_type_for_decl (dname, type,
7777 declarator->u.array.bounds);
7785 /* Declaring a function type.
7786 Make sure we have a valid type for the function to return. */
7788 if (type_quals != TYPE_UNQUALIFIED)
7790 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
7791 warning (OPT_Wreturn_type,
7792 "type qualifiers ignored on function return type");
7793 /* We now know that the TYPE_QUALS don't apply to the
7794 decl, but to its return type. */
7795 type_quals = TYPE_UNQUALIFIED;
7796 set_no_warning = true;
7799 /* Warn about some types functions can't return. */
7801 if (TREE_CODE (type) == FUNCTION_TYPE)
7803 error ("%qs declared as function returning a function", name);
7804 type = integer_type_node;
7806 if (TREE_CODE (type) == ARRAY_TYPE)
7808 error ("%qs declared as function returning an array", name);
7809 type = integer_type_node;
7812 /* Pick up type qualifiers which should be applied to `this'. */
7813 memfn_quals = declarator->u.function.qualifiers;
7815 /* Pick up the exception specifications. */
7816 raises = declarator->u.function.exception_specification;
7818 /* Say it's a definition only for the CALL_EXPR
7819 closest to the identifier. */
7820 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7822 if (ctype == NULL_TREE
7823 && decl_context == FIELD
7825 && (friendp == 0 || dname == current_class_name))
7826 ctype = current_class_type;
7828 if (ctype && (sfk == sfk_constructor
7829 || sfk == sfk_destructor))
7831 /* We are within a class's scope. If our declarator name
7832 is the same as the class name, and we are defining
7833 a function, then it is a constructor/destructor, and
7834 therefore returns a void type. */
7836 /* ISO C++ 12.4/2. A destructor may not be declared
7837 const or volatile. A destructor may not be
7840 ISO C++ 12.1. A constructor may not be declared
7841 const or volatile. A constructor may not be
7842 virtual. A constructor may not be static. */
7844 error ((flags == DTOR_FLAG)
7845 ? "destructor cannot be static member function"
7846 : "constructor cannot be static member function");
7849 error ((flags == DTOR_FLAG)
7850 ? "destructors may not be cv-qualified"
7851 : "constructors may not be cv-qualified");
7852 memfn_quals = TYPE_UNQUALIFIED;
7855 if (decl_context == FIELD
7856 && !member_function_or_else (ctype,
7859 return error_mark_node;
7861 if (flags != DTOR_FLAG)
7863 /* It's a constructor. */
7868 pedwarn ("constructors cannot be declared virtual");
7871 if (decl_context == FIELD
7872 && sfk != sfk_constructor)
7873 return error_mark_node;
7875 if (decl_context == FIELD)
7881 error ("can't initialize friend function %qs", name);
7884 /* Cannot be both friend and virtual. */
7885 error ("virtual functions cannot be friends");
7888 if (decl_context == NORMAL)
7889 error ("friend declaration not in class definition");
7890 if (current_function_decl && funcdef_flag)
7891 error ("can't define friend function %qs in a local "
7896 arg_types = grokparms (declarator->u.function.parameters,
7899 if (inner_declarator
7900 && inner_declarator->kind == cdk_id
7901 && inner_declarator->u.id.sfk == sfk_destructor
7902 && arg_types != void_list_node)
7904 error ("destructors may not have parameters");
7905 arg_types = void_list_node;
7909 type = build_function_type (type, arg_types);
7916 /* Filter out pointers-to-references and references-to-references.
7917 We can get these if a TYPE_DECL is used. */
7919 if (TREE_CODE (type) == REFERENCE_TYPE)
7921 if (declarator->kind != cdk_reference)
7923 error ("cannot declare pointer to %q#T", type);
7924 type = TREE_TYPE (type);
7927 /* In C++0x, we allow reference to reference declarations
7928 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
7929 and template type arguments [14.3.1/4 temp.arg.type]. The
7930 check for direct reference to reference declarations, which
7931 are still forbidden, occurs below. Reasoning behind the change
7932 can be found in DR106, DR540, and the rvalue reference
7934 else if (cxx_dialect == cxx98)
7936 error ("cannot declare reference to %q#T", type);
7937 type = TREE_TYPE (type);
7940 else if (VOID_TYPE_P (type))
7942 if (declarator->kind == cdk_reference)
7943 error ("cannot declare reference to %q#T", type);
7944 else if (declarator->kind == cdk_ptrmem)
7945 error ("cannot declare pointer to %q#T member", type);
7948 /* We now know that the TYPE_QUALS don't apply to the decl,
7949 but to the target of the pointer. */
7950 type_quals = TYPE_UNQUALIFIED;
7952 if (declarator->kind == cdk_ptrmem
7953 && (TREE_CODE (type) == FUNCTION_TYPE || memfn_quals))
7955 memfn_quals |= cp_type_quals (type);
7956 type = build_memfn_type (type,
7957 declarator->u.pointer.class_type,
7959 memfn_quals = TYPE_UNQUALIFIED;
7962 if (declarator->kind == cdk_reference)
7964 /* In C++0x, the type we are creating a reference to might be
7965 a typedef which is itself a reference type. In that case,
7966 we follow the reference collapsing rules in
7967 [7.1.3/8 dcl.typedef] to create the final reference type:
7969 "If a typedef TD names a type that is a reference to a type
7970 T, an attempt to create the type 'lvalue reference to cv TD'
7971 creates the type 'lvalue reference to T,' while an attempt
7972 to create the type "rvalue reference to cv TD' creates the
7975 if (!VOID_TYPE_P (type))
7976 type = cp_build_reference_type
7977 ((TREE_CODE (type) == REFERENCE_TYPE
7978 ? TREE_TYPE (type) : type),
7979 (declarator->u.reference.rvalue_ref
7980 && (TREE_CODE(type) != REFERENCE_TYPE
7981 || TYPE_REF_IS_RVALUE (type))));
7983 /* In C++0x, we need this check for direct reference to
7984 reference declarations, which are forbidden by
7985 [8.3.2/5 dcl.ref]. Reference to reference declarations
7986 are only allowed indirectly through typedefs and template
7987 type arguments. Example:
7989 void foo(int & &); // invalid ref-to-ref decl
7991 typedef int & int_ref;
7992 void foo(int_ref &); // valid ref-to-ref decl
7994 if (inner_declarator && inner_declarator->kind == cdk_reference)
7995 error ("cannot declare reference to %q#T, which is not "
7996 "a typedef or a template type argument", type);
7998 else if (TREE_CODE (type) == METHOD_TYPE)
7999 type = build_ptrmemfunc_type (build_pointer_type (type));
8000 else if (declarator->kind == cdk_ptrmem)
8002 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8004 if (declarator->u.pointer.class_type == error_mark_node)
8005 /* We will already have complained. */
8006 type = error_mark_node;
8008 type = build_ptrmem_type (declarator->u.pointer.class_type,
8012 type = build_pointer_type (type);
8014 /* Process a list of type modifier keywords (such as
8015 const or volatile) that were given inside the `*' or `&'. */
8017 if (declarator->u.pointer.qualifiers)
8020 = cp_build_qualified_type (type,
8021 declarator->u.pointer.qualifiers);
8022 type_quals = cp_type_quals (type);
8035 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8036 && TREE_CODE (type) != FUNCTION_TYPE
8037 && TREE_CODE (type) != METHOD_TYPE)
8039 error ("template-id %qD used as a declarator",
8041 unqualified_id = dname;
8044 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8045 qualified with a class-name, turn it into a METHOD_TYPE, unless
8046 we know that the function is static. We take advantage of this
8047 opportunity to do other processing that pertains to entities
8048 explicitly declared to be class members. Note that if DECLARATOR
8049 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8050 would not have exited the loop above. */
8052 && declarator->u.id.qualifying_scope
8053 && TYPE_P (declarator->u.id.qualifying_scope))
8057 ctype = declarator->u.id.qualifying_scope;
8058 ctype = TYPE_MAIN_VARIANT (ctype);
8060 while (t != NULL_TREE && CLASS_TYPE_P (t))
8062 /* You're supposed to have one `template <...>' for every
8063 template class, but you don't need one for a full
8064 specialization. For example:
8066 template <class T> struct S{};
8067 template <> struct S<int> { void f(); };
8068 void S<int>::f () {}
8070 is correct; there shouldn't be a `template <>' for the
8071 definition of `S<int>::f'. */
8072 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8073 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8074 /* T is an explicit (not partial) specialization. All
8075 containing classes must therefore also be explicitly
8078 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8079 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8080 template_count += 1;
8082 t = TYPE_MAIN_DECL (t);
8083 t = DECL_CONTEXT (t);
8086 if (ctype == current_class_type)
8090 pedwarn ("member functions are implicitly friends of their class");
8094 pedwarn ("extra qualification %<%T::%> on member %qs",
8097 else if (/* If the qualifying type is already complete, then we
8098 can skip the following checks. */
8099 !COMPLETE_TYPE_P (ctype)
8100 && (/* If the function is being defined, then
8101 qualifying type must certainly be complete. */
8103 /* A friend declaration of "T::f" is OK, even if
8104 "T" is a template parameter. But, if this
8105 function is not a friend, the qualifying type
8107 || (!friendp && !CLASS_TYPE_P (ctype))
8108 /* For a declaration, the type need not be
8109 complete, if either it is dependent (since there
8110 is no meaningful definition of complete in that
8111 case) or the qualifying class is currently being
8113 || !(dependent_type_p (ctype)
8114 || currently_open_class (ctype)))
8115 /* Check that the qualifying type is complete. */
8116 && !complete_type_or_else (ctype, NULL_TREE))
8117 return error_mark_node;
8118 else if (TREE_CODE (type) == FUNCTION_TYPE)
8120 tree sname = declarator->u.id.unqualified_name;
8122 if (current_class_type
8123 && (!friendp || funcdef_flag))
8126 ? "cannot define member function %<%T::%s%> within %<%T%>"
8127 : "cannot declare member function %<%T::%s%> within %<%T%>",
8128 ctype, name, current_class_type);
8129 return error_mark_node;
8132 if (TREE_CODE (sname) == IDENTIFIER_NODE
8133 && NEW_DELETE_OPNAME_P (sname))
8134 /* Overloaded operator new and operator delete
8135 are always static functions. */
8138 type = build_memfn_type (type, ctype, memfn_quals);
8140 else if (declspecs->specs[(int)ds_typedef]
8141 && current_class_type)
8143 error ("cannot declare member %<%T::%s%> within %qT",
8144 ctype, name, current_class_type);
8145 return error_mark_node;
8149 /* Now TYPE has the actual type. */
8154 *attrlist = chainon (returned_attrs, *attrlist);
8156 attrlist = &returned_attrs;
8159 /* Handle parameter packs. */
8160 if (parameter_pack_p)
8162 if (decl_context == PARM)
8163 /* Turn the type into a pack expansion.*/
8164 type = make_pack_expansion (type);
8166 error ("non-parameter %qs cannot be a parameter pack", name);
8169 /* Did array size calculations overflow? */
8171 if (TREE_CODE (type) == ARRAY_TYPE
8172 && COMPLETE_TYPE_P (type)
8173 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8174 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8176 error ("size of array %qs is too large", name);
8177 /* If we proceed with the array type as it is, we'll eventually
8178 crash in tree_low_cst(). */
8179 type = error_mark_node;
8182 if ((decl_context == FIELD || decl_context == PARM)
8183 && !processing_template_decl
8184 && variably_modified_type_p (type, NULL_TREE))
8186 if (decl_context == FIELD)
8187 error ("data member may not have variably modified type %qT", type);
8189 error ("parameter may not have variably modified type %qT", type);
8190 type = error_mark_node;
8193 if (explicitp == 1 || (explicitp && friendp))
8195 /* [dcl.fct.spec] The explicit specifier shall only be used in
8196 declarations of constructors within a class definition. */
8197 error ("only declarations of constructors can be %<explicit%>");
8201 if (storage_class == sc_mutable)
8203 if (decl_context != FIELD || friendp)
8205 error ("non-member %qs cannot be declared %<mutable%>", name);
8206 storage_class = sc_none;
8208 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8210 error ("non-object member %qs cannot be declared %<mutable%>", name);
8211 storage_class = sc_none;
8213 else if (TREE_CODE (type) == FUNCTION_TYPE
8214 || TREE_CODE (type) == METHOD_TYPE)
8216 error ("function %qs cannot be declared %<mutable%>", name);
8217 storage_class = sc_none;
8221 error ("static %qs cannot be declared %<mutable%>", name);
8222 storage_class = sc_none;
8224 else if (type_quals & TYPE_QUAL_CONST)
8226 error ("const %qs cannot be declared %<mutable%>", name);
8227 storage_class = sc_none;
8231 /* If this is declaring a typedef name, return a TYPE_DECL. */
8232 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8236 /* Note that the grammar rejects storage classes
8237 in typenames, fields or parameters. */
8238 if (current_lang_name == lang_name_java)
8239 TYPE_FOR_JAVA (type) = 1;
8241 /* This declaration:
8243 typedef void f(int) const;
8245 declares a function type which is not a member of any
8246 particular class, but which is cv-qualified; for
8247 example "f S::*" declares a pointer to a const-qualified
8248 member function of S. We record the cv-qualification in the
8250 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8252 type = cp_build_qualified_type (type, memfn_quals);
8254 /* We have now dealt with these qualifiers. */
8255 memfn_quals = TYPE_UNQUALIFIED;
8258 if (decl_context == FIELD)
8259 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8261 decl = build_decl (TYPE_DECL, unqualified_id, type);
8262 if (id_declarator && declarator->u.id.qualifying_scope)
8263 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8265 if (decl_context != FIELD)
8267 if (!current_function_decl)
8268 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8269 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8270 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8271 (current_function_decl)))
8272 /* The TYPE_DECL is "abstract" because there will be
8273 clones of this constructor/destructor, and there will
8274 be copies of this TYPE_DECL generated in those
8276 DECL_ABSTRACT (decl) = 1;
8278 else if (constructor_name_p (unqualified_id, current_class_type))
8279 pedwarn ("ISO C++ forbids nested type %qD with same name "
8280 "as enclosing class",
8283 /* If the user declares "typedef struct {...} foo" then the
8284 struct will have an anonymous name. Fill that name in now.
8285 Nothing can refer to it, so nothing needs know about the name
8287 if (type != error_mark_node
8290 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8291 && TYPE_ANONYMOUS_P (type)
8292 /* Don't do this if there are attributes. */
8293 && (!attrlist || !*attrlist)
8294 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8296 tree oldname = TYPE_NAME (type);
8299 /* Replace the anonymous name with the real name everywhere. */
8300 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8301 if (TYPE_NAME (t) == oldname)
8302 TYPE_NAME (t) = decl;
8304 if (TYPE_LANG_SPECIFIC (type))
8305 TYPE_WAS_ANONYMOUS (type) = 1;
8307 /* If this is a typedef within a template class, the nested
8308 type is a (non-primary) template. The name for the
8309 template needs updating as well. */
8310 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8311 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8312 = TYPE_IDENTIFIER (type);
8314 /* FIXME remangle member functions; member functions of a
8315 type with external linkage have external linkage. */
8319 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8320 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8322 bad_specifiers (decl, "type", virtualp,
8323 memfn_quals != TYPE_UNQUALIFIED,
8324 inlinep, friendp, raises != NULL_TREE);
8329 /* Detect the case of an array type of unspecified size
8330 which came, as such, direct from a typedef name.
8331 We must copy the type, so that the array's domain can be
8332 individually set by the object's initializer. */
8334 if (type && typedef_type
8335 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8336 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8337 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8339 /* Detect where we're using a typedef of function type to declare a
8340 function. PARMS will not be set, so we must create it now. */
8342 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8344 tree decls = NULL_TREE;
8347 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8349 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8351 TREE_CHAIN (decl) = decls;
8355 parms = nreverse (decls);
8357 if (decl_context != TYPENAME)
8359 /* A cv-qualifier-seq shall only be part of the function type
8360 for a non-static member function. [8.3.5/4 dcl.fct] */
8361 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8362 && (current_class_type == NULL_TREE || staticp) )
8365 ? G_("qualified function types cannot be used to "
8366 "declare static member functions")
8367 : G_("qualified function types cannot be used to "
8368 "declare free functions"));
8369 type = TYPE_MAIN_VARIANT (type);
8372 /* The qualifiers on the function type become the qualifiers on
8373 the non-static member function. */
8374 memfn_quals |= cp_type_quals (type);
8378 /* If this is a type name (such as, in a cast or sizeof),
8379 compute the type and return it now. */
8381 if (decl_context == TYPENAME)
8383 /* Note that the grammar rejects storage classes
8384 in typenames, fields or parameters. */
8385 if (type_quals != TYPE_UNQUALIFIED)
8386 type_quals = TYPE_UNQUALIFIED;
8388 /* Special case: "friend class foo" looks like a TYPENAME context. */
8391 if (type_quals != TYPE_UNQUALIFIED)
8393 error ("type qualifiers specified for friend class declaration");
8394 type_quals = TYPE_UNQUALIFIED;
8398 error ("%<inline%> specified for friend class declaration");
8404 /* Don't allow friend declaration without a class-key. */
8405 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8406 pedwarn ("template parameters cannot be friends");
8407 else if (TREE_CODE (type) == TYPENAME_TYPE)
8408 pedwarn ("friend declaration requires class-key, "
8409 "i.e. %<friend class %T::%D%>",
8410 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8412 pedwarn ("friend declaration requires class-key, "
8413 "i.e. %<friend %#T%>",
8417 /* Only try to do this stuff if we didn't already give up. */
8418 if (type != integer_type_node)
8420 /* A friendly class? */
8421 if (current_class_type)
8422 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8425 error ("trying to make class %qT a friend of global scope",
8428 type = void_type_node;
8431 else if (memfn_quals)
8433 if (ctype == NULL_TREE)
8435 if (TREE_CODE (type) != METHOD_TYPE)
8436 error ("invalid qualifiers on non-member function type");
8438 ctype = TYPE_METHOD_BASETYPE (type);
8441 type = build_memfn_type (type, ctype, memfn_quals);
8446 else if (unqualified_id == NULL_TREE && decl_context != PARM
8447 && decl_context != CATCHPARM
8448 && TREE_CODE (type) != UNION_TYPE
8451 error ("abstract declarator %qT used as declaration", type);
8452 return error_mark_node;
8455 /* Only functions may be declared using an operator-function-id. */
8457 && IDENTIFIER_OPNAME_P (unqualified_id)
8458 && TREE_CODE (type) != FUNCTION_TYPE
8459 && TREE_CODE (type) != METHOD_TYPE)
8461 error ("declaration of %qD as non-function", unqualified_id);
8462 return error_mark_node;
8465 /* We don't check parameter types here because we can emit a better
8466 error message later. */
8467 if (decl_context != PARM)
8469 type = check_var_type (unqualified_id, type);
8470 if (type == error_mark_node)
8471 return error_mark_node;
8474 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8475 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8477 if (decl_context == PARM || decl_context == CATCHPARM)
8479 if (ctype || in_namespace)
8480 error ("cannot use %<::%> in parameter declaration");
8482 /* A parameter declared as an array of T is really a pointer to T.
8483 One declared as a function is really a pointer to a function.
8484 One declared as a member is really a pointer to member. */
8486 if (TREE_CODE (type) == ARRAY_TYPE)
8488 /* Transfer const-ness of array into that of type pointed to. */
8489 type = build_pointer_type (TREE_TYPE (type));
8490 type_quals = TYPE_UNQUALIFIED;
8492 else if (TREE_CODE (type) == FUNCTION_TYPE)
8493 type = build_pointer_type (type);
8499 if (decl_context == PARM)
8501 decl = cp_build_parm_decl (unqualified_id, type);
8503 bad_specifiers (decl, "parameter", virtualp,
8504 memfn_quals != TYPE_UNQUALIFIED,
8505 inlinep, friendp, raises != NULL_TREE);
8507 else if (decl_context == FIELD)
8509 /* The C99 flexible array extension. */
8510 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8511 && TYPE_DOMAIN (type) == NULL_TREE)
8513 tree itype = compute_array_index_type (dname, integer_zero_node);
8514 type = build_cplus_array_type (TREE_TYPE (type), itype);
8517 if (type == error_mark_node)
8519 /* Happens when declaring arrays of sizes which
8520 are error_mark_node, for example. */
8523 else if (in_namespace && !friendp)
8525 /* Something like struct S { int N::j; }; */
8526 error ("invalid use of %<::%>");
8527 return error_mark_node;
8529 else if (TREE_CODE (type) == FUNCTION_TYPE)
8532 tree function_context;
8536 if (ctype == NULL_TREE)
8537 ctype = current_class_type;
8539 if (ctype == NULL_TREE)
8541 error ("can't make %qD into a method -- not in a class",
8543 return error_mark_node;
8546 /* ``A union may [ ... ] not [ have ] virtual functions.''
8548 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8550 error ("function %qD declared virtual inside a union",
8552 return error_mark_node;
8555 if (NEW_DELETE_OPNAME_P (unqualified_id))
8559 error ("%qD cannot be declared virtual, since it "
8565 else if (staticp < 2)
8566 type = build_memfn_type (type, ctype, memfn_quals);
8569 /* Check that the name used for a destructor makes sense. */
8570 if (sfk == sfk_destructor)
8574 gcc_assert (friendp);
8575 error ("expected qualified name in friend declaration "
8576 "for destructor %qD",
8577 id_declarator->u.id.unqualified_name);
8578 return error_mark_node;
8581 if (!same_type_p (TREE_OPERAND
8582 (id_declarator->u.id.unqualified_name, 0),
8585 error ("declaration of %qD as member of %qT",
8586 id_declarator->u.id.unqualified_name, ctype);
8587 return error_mark_node;
8591 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8592 function_context = (ctype != NULL_TREE) ?
8593 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8594 publicp = (! friendp || ! staticp)
8595 && function_context == NULL_TREE;
8596 decl = grokfndecl (ctype, type,
8597 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8598 ? unqualified_id : dname,
8601 virtualp, flags, memfn_quals, raises,
8602 friendp ? -1 : 0, friendp, publicp, inlinep,
8604 funcdef_flag, template_count, in_namespace, attrlist);
8605 if (decl == NULL_TREE)
8606 return error_mark_node;
8608 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8609 /* The decl and setting of decl_attr is also turned off. */
8610 decl = build_decl_attribute_variant (decl, decl_attr);
8613 /* [class.conv.ctor]
8615 A constructor declared without the function-specifier
8616 explicit that can be called with a single parameter
8617 specifies a conversion from the type of its first
8618 parameter to the type of its class. Such a constructor
8619 is called a converting constructor. */
8621 DECL_NONCONVERTING_P (decl) = 1;
8622 else if (DECL_CONSTRUCTOR_P (decl))
8624 /* The constructor can be called with exactly one
8625 parameter if there is at least one parameter, and
8626 any subsequent parameters have default arguments.
8627 Ignore any compiler-added parms. */
8628 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8630 if (arg_types == void_list_node
8632 && TREE_CHAIN (arg_types)
8633 && TREE_CHAIN (arg_types) != void_list_node
8634 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8635 DECL_NONCONVERTING_P (decl) = 1;
8638 else if (TREE_CODE (type) == METHOD_TYPE)
8640 /* We only get here for friend declarations of
8641 members of other classes. */
8642 /* All method decls are public, so tell grokfndecl to set
8643 TREE_PUBLIC, also. */
8644 decl = grokfndecl (ctype, type,
8645 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8646 ? unqualified_id : dname,
8649 virtualp, flags, memfn_quals, raises,
8650 friendp ? -1 : 0, friendp, 1, 0, sfk,
8651 funcdef_flag, template_count, in_namespace,
8653 if (decl == NULL_TREE)
8654 return error_mark_node;
8656 else if (!staticp && !dependent_type_p (type)
8657 && !COMPLETE_TYPE_P (complete_type (type))
8658 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8661 error ("field %qD has incomplete type", unqualified_id);
8663 error ("name %qT has incomplete type", type);
8665 /* If we're instantiating a template, tell them which
8666 instantiation made the field's type be incomplete. */
8667 if (current_class_type
8668 && TYPE_NAME (current_class_type)
8669 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8671 && declspecs->type == type)
8672 error (" in instantiation of template %qT",
8673 current_class_type);
8675 return error_mark_node;
8681 error ("%qE is neither function nor member function; "
8682 "cannot be declared friend", unqualified_id);
8690 /* Friends are treated specially. */
8691 if (ctype == current_class_type)
8692 ; /* We already issued a pedwarn. */
8693 else if (decl && DECL_NAME (decl))
8695 if (template_class_depth (current_class_type) == 0)
8697 decl = check_explicit_specialization
8698 (unqualified_id, decl, template_count,
8699 2 * funcdef_flag + 4);
8700 if (decl == error_mark_node)
8701 return error_mark_node;
8704 decl = do_friend (ctype, unqualified_id, decl,
8710 return error_mark_node;
8713 /* Structure field. It may not be a function, except for C++. */
8715 if (decl == NULL_TREE)
8721 /* An attempt is being made to initialize a non-static
8722 member. But, from [class.mem]:
8724 4 A member-declarator can contain a
8725 constant-initializer only if it declares a static
8726 member (_class.static_) of integral or enumeration
8727 type, see _class.static.data_.
8729 This used to be relatively common practice, but
8730 the rest of the compiler does not correctly
8731 handle the initialization unless the member is
8732 static so we make it static below. */
8733 pedwarn ("ISO C++ forbids initialization of member %qD",
8735 pedwarn ("making %qD static", unqualified_id);
8739 if (uses_template_parms (type))
8740 /* We'll check at instantiation time. */
8742 else if (check_static_variable_definition (unqualified_id,
8744 /* If we just return the declaration, crashes
8745 will sometimes occur. We therefore return
8746 void_type_node, as if this was a friend
8747 declaration, to cause callers to completely
8748 ignore this declaration. */
8749 return error_mark_node;
8754 /* C++ allows static class members. All other work
8755 for this is done by grokfield. */
8756 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8757 set_linkage_for_static_data_member (decl);
8758 /* Even if there is an in-class initialization, DECL
8759 is considered undefined until an out-of-class
8760 definition is provided. */
8761 DECL_EXTERNAL (decl) = 1;
8764 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
8768 decl = build_decl (FIELD_DECL, unqualified_id, type);
8769 DECL_NONADDRESSABLE_P (decl) = bitfield;
8770 if (bitfield && !unqualified_id)
8771 TREE_NO_WARNING (decl) = 1;
8773 if (storage_class == sc_mutable)
8775 DECL_MUTABLE_P (decl) = 1;
8776 storage_class = sc_none;
8780 bad_specifiers (decl, "field", virtualp,
8781 memfn_quals != TYPE_UNQUALIFIED,
8782 inlinep, friendp, raises != NULL_TREE);
8785 else if (TREE_CODE (type) == FUNCTION_TYPE
8786 || TREE_CODE (type) == METHOD_TYPE)
8791 if (!unqualified_id)
8792 return error_mark_node;
8794 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8795 original_name = dname;
8797 original_name = unqualified_id;
8799 if (storage_class == sc_auto)
8800 error ("storage class %<auto%> invalid for function %qs", name);
8801 else if (storage_class == sc_register)
8802 error ("storage class %<register%> invalid for function %qs", name);
8804 error ("storage class %<__thread%> invalid for function %qs", name);
8806 /* Function declaration not at top level.
8807 Storage classes other than `extern' are not allowed
8808 and `extern' makes no difference. */
8809 if (! toplevel_bindings_p ()
8810 && (storage_class == sc_static
8811 || declspecs->specs[(int)ds_inline])
8814 if (storage_class == sc_static)
8815 pedwarn ("%<static%> specified invalid for function %qs "
8816 "declared out of global scope", name);
8818 pedwarn ("%<inline%> specifier invalid for function %qs "
8819 "declared out of global scope", name);
8822 if (ctype == NULL_TREE)
8826 error ("virtual non-class function %qs", name);
8830 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8831 && !NEW_DELETE_OPNAME_P (original_name))
8832 type = build_method_type_directly (ctype,
8834 TYPE_ARG_TYPES (type));
8836 /* Record presence of `static'. */
8837 publicp = (ctype != NULL_TREE
8838 || storage_class == sc_extern
8839 || storage_class != sc_static);
8841 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8842 virtualp, flags, memfn_quals, raises,
8844 publicp, inlinep, sfk, funcdef_flag,
8845 template_count, in_namespace, attrlist);
8846 if (decl == NULL_TREE)
8847 return error_mark_node;
8851 int invalid_static = 0;
8853 /* Don't allow a static member function in a class, and forbid
8854 declaring main to be static. */
8855 if (TREE_CODE (type) == METHOD_TYPE)
8857 pedwarn ("cannot declare member function %qD to have "
8858 "static linkage", decl);
8861 else if (current_function_decl)
8863 /* FIXME need arm citation */
8864 error ("cannot declare static function inside another function");
8871 storage_class = sc_none;
8877 /* It's a variable. */
8879 /* An uninitialized decl with `extern' is a reference. */
8880 decl = grokvardecl (type, unqualified_id,
8883 (type_quals & TYPE_QUAL_CONST) != 0,
8884 ctype ? ctype : in_namespace);
8885 bad_specifiers (decl, "variable", virtualp,
8886 memfn_quals != TYPE_UNQUALIFIED,
8887 inlinep, friendp, raises != NULL_TREE);
8891 DECL_CONTEXT (decl) = ctype;
8894 pedwarn ("%<static%> may not be used when defining "
8895 "(as opposed to declaring) a static data member");
8897 storage_class = sc_none;
8899 if (storage_class == sc_register && TREE_STATIC (decl))
8901 error ("static member %qD declared %<register%>", decl);
8902 storage_class = sc_none;
8904 if (storage_class == sc_extern && pedantic)
8906 pedwarn ("cannot explicitly declare member %q#D to have "
8909 storage_class = sc_none;
8914 /* Record `register' declaration for warnings on &
8915 and in case doing stupid register allocation. */
8917 if (storage_class == sc_register)
8918 DECL_REGISTER (decl) = 1;
8919 else if (storage_class == sc_extern)
8920 DECL_THIS_EXTERN (decl) = 1;
8921 else if (storage_class == sc_static)
8922 DECL_THIS_STATIC (decl) = 1;
8924 /* Record constancy and volatility. There's no need to do this
8925 when processing a template; we'll do this for the instantiated
8926 declaration based on the type of DECL. */
8927 if (!processing_template_decl)
8928 cp_apply_type_quals_to_decl (type_quals, decl);
8931 TREE_NO_WARNING (decl) = 1;
8937 /* Subroutine of start_function. Ensure that each of the parameter
8938 types (as listed in PARMS) is complete, as is required for a
8939 function definition. */
8942 require_complete_types_for_parms (tree parms)
8944 for (; parms; parms = TREE_CHAIN (parms))
8946 if (dependent_type_p (TREE_TYPE (parms)))
8948 if (!VOID_TYPE_P (TREE_TYPE (parms))
8949 && complete_type_or_else (TREE_TYPE (parms), parms))
8951 relayout_decl (parms);
8952 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8955 /* grokparms or complete_type_or_else will have already issued
8957 TREE_TYPE (parms) = error_mark_node;
8961 /* Returns nonzero if T is a local variable. */
8964 local_variable_p (tree t)
8966 if ((TREE_CODE (t) == VAR_DECL
8967 /* A VAR_DECL with a context that is a _TYPE is a static data
8969 && !TYPE_P (CP_DECL_CONTEXT (t))
8970 /* Any other non-local variable must be at namespace scope. */
8971 && !DECL_NAMESPACE_SCOPE_P (t))
8972 || (TREE_CODE (t) == PARM_DECL))
8978 /* Returns nonzero if T is an automatic local variable or a label.
8979 (These are the declarations that need to be remapped when the code
8980 containing them is duplicated.) */
8983 nonstatic_local_decl_p (tree t)
8985 return ((local_variable_p (t) && !TREE_STATIC (t))
8986 || TREE_CODE (t) == LABEL_DECL
8987 || TREE_CODE (t) == RESULT_DECL);
8990 /* Like local_variable_p, but suitable for use as a tree-walking
8994 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8995 void *data ATTRIBUTE_UNUSED)
8997 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8999 else if (TYPE_P (*tp))
9006 /* Check that ARG, which is a default-argument expression for a
9007 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9008 something goes wrong. DECL may also be a _TYPE node, rather than a
9009 DECL, if there is no DECL available. */
9012 check_default_argument (tree decl, tree arg)
9017 if (TREE_CODE (arg) == DEFAULT_ARG)
9018 /* We get a DEFAULT_ARG when looking at an in-class declaration
9019 with a default argument. Ignore the argument for now; we'll
9020 deal with it after the class is complete. */
9029 decl_type = TREE_TYPE (decl);
9031 if (arg == error_mark_node
9032 || decl == error_mark_node
9033 || TREE_TYPE (arg) == error_mark_node
9034 || decl_type == error_mark_node)
9035 /* Something already went wrong. There's no need to check
9037 return error_mark_node;
9039 /* [dcl.fct.default]
9041 A default argument expression is implicitly converted to the
9043 if (!TREE_TYPE (arg)
9044 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9047 error ("default argument for %q#D has type %qT",
9048 decl, TREE_TYPE (arg));
9050 error ("default argument for parameter of type %qT has type %qT",
9051 decl_type, TREE_TYPE (arg));
9053 return error_mark_node;
9056 /* [dcl.fct.default]
9058 Local variables shall not be used in default argument
9061 The keyword `this' shall not be used in a default argument of a
9063 var = walk_tree_without_duplicates (&arg, local_variable_p_walkfn,
9067 error ("default argument %qE uses local variable %qD", arg, var);
9068 return error_mark_node;
9075 /* Decode the list of parameter types for a function type.
9076 Given the list of things declared inside the parens,
9077 return a list of types.
9079 If this parameter does not end with an ellipsis, we append
9082 *PARMS is set to the chain of PARM_DECLs created. */
9085 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9087 tree result = NULL_TREE;
9088 tree decls = NULL_TREE;
9089 int ellipsis = !first_parm || first_parm->ellipsis_p;
9090 cp_parameter_declarator *parm;
9092 struct pointer_set_t *unique_decls = pointer_set_create ();
9094 for (parm = first_parm; parm != NULL; parm = parm->next)
9096 tree type = NULL_TREE;
9097 tree init = parm->default_argument;
9101 if (parm == no_parameters)
9104 attrs = parm->decl_specifiers.attributes;
9105 parm->decl_specifiers.attributes = NULL_TREE;
9106 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9107 PARM, init != NULL_TREE, &attrs);
9108 if (! decl || TREE_TYPE (decl) == error_mark_node)
9112 cplus_decl_attributes (&decl, attrs, 0);
9114 type = TREE_TYPE (decl);
9115 if (VOID_TYPE_P (type))
9117 if (same_type_p (type, void_type_node)
9118 && DECL_SELF_REFERENCE_P (type)
9119 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9120 /* this is a parmlist of `(void)', which is ok. */
9122 cxx_incomplete_type_error (decl, type);
9123 /* It's not a good idea to actually create parameters of
9124 type `void'; other parts of the compiler assume that a
9125 void type terminates the parameter list. */
9126 type = error_mark_node;
9127 TREE_TYPE (decl) = error_mark_node;
9130 if (type != error_mark_node)
9132 /* Top-level qualifiers on the parameters are
9133 ignored for function types. */
9134 type = cp_build_qualified_type (type, 0);
9135 if (TREE_CODE (type) == METHOD_TYPE)
9137 error ("parameter %qD invalidly declared method type", decl);
9138 type = build_pointer_type (type);
9139 TREE_TYPE (decl) = type;
9141 else if (abstract_virtuals_error (decl, type))
9142 any_error = 1; /* Seems like a good idea. */
9143 else if (POINTER_TYPE_P (type))
9145 /* [dcl.fct]/6, parameter types cannot contain pointers
9146 (references) to arrays of unknown bound. */
9147 tree t = TREE_TYPE (type);
9148 int ptr = TYPE_PTR_P (type);
9154 else if (TREE_CODE (t) != ARRAY_TYPE)
9156 else if (!TYPE_DOMAIN (t))
9160 if (TREE_CODE (t) == ARRAY_TYPE)
9161 error ("parameter %qD includes %s to array of unknown "
9163 decl, ptr ? "pointer" : "reference", t);
9168 else if (init && !processing_template_decl)
9169 init = check_default_argument (decl, init);
9172 if (TREE_CODE (decl) == PARM_DECL
9173 && FUNCTION_PARAMETER_PACK_P (decl)
9175 error ("parameter packs must be at the end of the parameter list");
9177 if (DECL_NAME (decl))
9179 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9180 error ("multiple parameters named %qE", DECL_NAME (decl));
9182 pointer_set_insert (unique_decls, DECL_NAME (decl));
9185 TREE_CHAIN (decl) = decls;
9187 result = tree_cons (init, type, result);
9189 decls = nreverse (decls);
9190 result = nreverse (result);
9192 result = chainon (result, void_list_node);
9195 pointer_set_destroy (unique_decls);
9200 /* D is a constructor or overloaded `operator='.
9202 Let T be the class in which D is declared. Then, this function
9205 -1 if D's is an ill-formed constructor or copy assignment operator
9206 whose first parameter is of type `T'.
9207 0 if D is not a copy constructor or copy assignment
9209 1 if D is a copy constructor or copy assignment operator whose
9210 first parameter is a reference to const qualified T.
9211 2 if D is a copy constructor or copy assignment operator whose
9212 first parameter is a reference to non-const qualified T.
9214 This function can be used as a predicate. Positive values indicate
9215 a copy constructor and nonzero values indicate a copy assignment
9225 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9227 if (TREE_CODE (d) == TEMPLATE_DECL
9228 || (DECL_TEMPLATE_INFO (d)
9229 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9230 /* Instantiations of template member functions are never copy
9231 functions. Note that member functions of templated classes are
9232 represented as template functions internally, and we must
9233 accept those as copy functions. */
9236 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9240 arg_type = TREE_VALUE (args);
9241 if (arg_type == error_mark_node)
9244 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9246 /* Pass by value copy assignment operator. */
9249 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9250 && !TYPE_REF_IS_RVALUE (arg_type)
9251 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9253 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9259 args = TREE_CHAIN (args);
9261 if (args && args != void_list_node && !TREE_PURPOSE (args))
9262 /* There are more non-optional args. */
9268 /* D is a constructor or overloaded `operator='.
9270 Let T be the class in which D is declared. Then, this function
9271 returns true when D is a move constructor or move assignment
9272 operator, false otherwise. */
9279 bool result = false;
9281 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9283 if (cxx_dialect == cxx98)
9284 /* There are no move constructors if we are in C++98 mode. */
9287 if (TREE_CODE (d) == TEMPLATE_DECL
9288 || (DECL_TEMPLATE_INFO (d)
9289 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9290 /* Instantiations of template member functions are never copy
9291 functions. Note that member functions of templated classes are
9292 represented as template functions internally, and we must
9293 accept those as copy functions. */
9296 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9300 arg_type = TREE_VALUE (args);
9301 if (arg_type == error_mark_node)
9304 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9305 && TYPE_REF_IS_RVALUE (arg_type)
9306 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9310 args = TREE_CHAIN (args);
9312 if (args && args != void_list_node && !TREE_PURPOSE (args))
9313 /* There are more non-optional args. */
9319 /* Remember any special properties of member function DECL. */
9321 void grok_special_member_properties (tree decl)
9325 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9328 class_type = DECL_CONTEXT (decl);
9329 if (DECL_CONSTRUCTOR_P (decl))
9331 int ctor = copy_fn_p (decl);
9333 TYPE_HAS_CONSTRUCTOR (class_type) = 1;
9339 A non-template constructor for class X is a copy
9340 constructor if its first parameter is of type X&, const
9341 X&, volatile X& or const volatile X&, and either there
9342 are no other parameters or else all other parameters have
9343 default arguments. */
9344 TYPE_HAS_INIT_REF (class_type) = 1;
9346 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9348 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9349 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9351 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9355 A non-template assignment operator for class X is a copy
9356 assignment operator if its parameter is of type X, X&, const
9357 X&, volatile X& or const volatile X&. */
9359 int assop = copy_fn_p (decl);
9363 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9365 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9370 /* Check a constructor DECL has the correct form. Complains
9371 if the class has a constructor of the form X(X). */
9374 grok_ctor_properties (tree ctype, tree decl)
9376 int ctor_parm = copy_fn_p (decl);
9382 A declaration of a constructor for a class X is ill-formed if
9383 its first parameter is of type (optionally cv-qualified) X
9384 and either there are no other parameters or else all other
9385 parameters have default arguments.
9387 We *don't* complain about member template instantiations that
9388 have this form, though; they can occur as we try to decide
9389 what constructor to use during overload resolution. Since
9390 overload resolution will never prefer such a constructor to
9391 the non-template copy constructor (which is either explicitly
9392 or implicitly defined), there's no need to worry about their
9393 existence. Theoretically, they should never even be
9394 instantiated, but that's hard to forestall. */
9395 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9403 /* An operator with this code is unary, but can also be binary. */
9406 ambi_op_p (enum tree_code code)
9408 return (code == INDIRECT_REF
9409 || code == ADDR_EXPR
9410 || code == UNARY_PLUS_EXPR
9411 || code == NEGATE_EXPR
9412 || code == PREINCREMENT_EXPR
9413 || code == PREDECREMENT_EXPR);
9416 /* An operator with this name can only be unary. */
9419 unary_op_p (enum tree_code code)
9421 return (code == TRUTH_NOT_EXPR
9422 || code == BIT_NOT_EXPR
9423 || code == COMPONENT_REF
9424 || code == TYPE_EXPR);
9427 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9428 errors are issued for invalid declarations. */
9431 grok_op_properties (tree decl, bool complain)
9433 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9435 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9436 tree name = DECL_NAME (decl);
9437 enum tree_code operator_code;
9442 /* Count the number of arguments and check for ellipsis. */
9443 for (argtype = argtypes, arity = 0;
9444 argtype && argtype != void_list_node;
9445 argtype = TREE_CHAIN (argtype))
9447 ellipsis_p = !argtype;
9449 class_type = DECL_CONTEXT (decl);
9450 if (class_type && !CLASS_TYPE_P (class_type))
9451 class_type = NULL_TREE;
9453 if (DECL_CONV_FN_P (decl))
9454 operator_code = TYPE_EXPR;
9458 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9459 if (ansi_opname (CODE) == name) \
9461 operator_code = (CODE); \
9464 else if (ansi_assopname (CODE) == name) \
9466 operator_code = (CODE); \
9467 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9471 #include "operators.def"
9477 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9478 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9481 switch (operator_code)
9484 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9488 TYPE_GETS_DELETE (class_type) |= 1;
9492 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9495 case VEC_DELETE_EXPR:
9496 TYPE_GETS_DELETE (class_type) |= 2;
9503 /* [basic.std.dynamic.allocation]/1:
9505 A program is ill-formed if an allocation function is declared
9506 in a namespace scope other than global scope or declared static
9509 The same also holds true for deallocation functions. */
9510 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9511 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9513 if (DECL_NAMESPACE_SCOPE_P (decl))
9515 if (CP_DECL_CONTEXT (decl) != global_namespace)
9517 error ("%qD may not be declared within a namespace", decl);
9520 else if (!TREE_PUBLIC (decl))
9522 error ("%qD may not be declared as static", decl);
9528 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9529 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9530 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9531 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9534 /* An operator function must either be a non-static member function
9535 or have at least one parameter of a class, a reference to a class,
9536 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9537 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9539 if (operator_code == TYPE_EXPR
9540 || operator_code == CALL_EXPR
9541 || operator_code == COMPONENT_REF
9542 || operator_code == ARRAY_REF
9543 || operator_code == NOP_EXPR)
9545 error ("%qD must be a nonstatic member function", decl);
9552 if (DECL_STATIC_FUNCTION_P (decl))
9554 error ("%qD must be either a non-static member "
9555 "function or a non-member function", decl);
9559 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9561 tree arg = non_reference (TREE_VALUE (p));
9562 if (arg == error_mark_node)
9565 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9566 because these checks are performed even on
9567 template functions. */
9568 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9572 if (!p || p == void_list_node)
9575 error ("%qD must have an argument of class or "
9576 "enumerated type", decl);
9582 /* There are no restrictions on the arguments to an overloaded
9584 if (operator_code == CALL_EXPR)
9587 /* Warn about conversion operators that will never be used. */
9588 if (IDENTIFIER_TYPENAME_P (name)
9589 && ! DECL_TEMPLATE_INFO (decl)
9591 /* Warn only declaring the function; there is no need to
9592 warn again about out-of-class definitions. */
9593 && class_type == current_class_type)
9595 tree t = TREE_TYPE (name);
9596 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9597 const char *what = 0;
9600 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9602 if (TREE_CODE (t) == VOID_TYPE)
9604 else if (class_type)
9606 if (t == class_type)
9607 what = "the same type";
9608 /* Don't force t to be complete here. */
9609 else if (IS_AGGR_TYPE (t)
9610 && COMPLETE_TYPE_P (t)
9611 && DERIVED_FROM_P (t, class_type))
9612 what = "a base class";
9616 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9617 "conversion operator",
9618 ref ? "a reference to " : "", what);
9621 if (operator_code == COND_EXPR)
9624 error ("ISO C++ prohibits overloading operator ?:");
9627 else if (ellipsis_p)
9629 error ("%qD must not have variable number of arguments", decl);
9632 else if (ambi_op_p (operator_code))
9635 /* We pick the one-argument operator codes by default, so
9636 we don't have to change anything. */
9638 else if (arity == 2)
9640 /* If we thought this was a unary operator, we now know
9641 it to be a binary operator. */
9642 switch (operator_code)
9645 operator_code = MULT_EXPR;
9649 operator_code = BIT_AND_EXPR;
9652 case UNARY_PLUS_EXPR:
9653 operator_code = PLUS_EXPR;
9657 operator_code = MINUS_EXPR;
9660 case PREINCREMENT_EXPR:
9661 operator_code = POSTINCREMENT_EXPR;
9664 case PREDECREMENT_EXPR:
9665 operator_code = POSTDECREMENT_EXPR;
9672 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9674 if ((operator_code == POSTINCREMENT_EXPR
9675 || operator_code == POSTDECREMENT_EXPR)
9676 && ! processing_template_decl
9677 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9680 error ("postfix %qD must take %<int%> as its argument",
9683 error ("postfix %qD must take %<int%> as its second "
9691 error ("%qD must take either zero or one argument", decl);
9693 error ("%qD must take either one or two arguments", decl);
9697 /* More Effective C++ rule 6. */
9699 && (operator_code == POSTINCREMENT_EXPR
9700 || operator_code == POSTDECREMENT_EXPR
9701 || operator_code == PREINCREMENT_EXPR
9702 || operator_code == PREDECREMENT_EXPR))
9704 tree arg = TREE_VALUE (argtypes);
9705 tree ret = TREE_TYPE (TREE_TYPE (decl));
9706 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9707 arg = TREE_TYPE (arg);
9708 arg = TYPE_MAIN_VARIANT (arg);
9709 if (operator_code == PREINCREMENT_EXPR
9710 || operator_code == PREDECREMENT_EXPR)
9712 if (TREE_CODE (ret) != REFERENCE_TYPE
9713 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9715 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9716 build_reference_type (arg));
9720 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9721 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
9725 else if (unary_op_p (operator_code))
9730 error ("%qD must take %<void%>", decl);
9732 error ("%qD must take exactly one argument", decl);
9736 else /* if (binary_op_p (operator_code)) */
9741 error ("%qD must take exactly one argument", decl);
9743 error ("%qD must take exactly two arguments", decl);
9747 /* More Effective C++ rule 7. */
9749 && (operator_code == TRUTH_ANDIF_EXPR
9750 || operator_code == TRUTH_ORIF_EXPR
9751 || operator_code == COMPOUND_EXPR))
9752 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
9756 /* Effective C++ rule 23. */
9759 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9760 && (operator_code == PLUS_EXPR
9761 || operator_code == MINUS_EXPR
9762 || operator_code == TRUNC_DIV_EXPR
9763 || operator_code == MULT_EXPR
9764 || operator_code == TRUNC_MOD_EXPR)
9765 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9766 warning (OPT_Weffc__, "%qD should return by value", decl);
9769 for (; argtypes && argtypes != void_list_node;
9770 argtypes = TREE_CHAIN (argtypes))
9771 if (TREE_PURPOSE (argtypes))
9773 TREE_PURPOSE (argtypes) = NULL_TREE;
9774 if (operator_code == POSTINCREMENT_EXPR
9775 || operator_code == POSTDECREMENT_EXPR)
9778 pedwarn ("%qD cannot have default arguments", decl);
9782 error ("%qD cannot have default arguments", decl);
9790 /* Return a string giving the keyword associate with CODE. */
9793 tag_name (enum tag_types code)
9812 /* Name lookup in an elaborated-type-specifier (after the keyword
9813 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9814 elaborated-type-specifier is invalid, issue a diagnostic and return
9815 error_mark_node; otherwise, return the *_TYPE to which it referred.
9816 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9819 check_elaborated_type_specifier (enum tag_types tag_code,
9821 bool allow_template_p)
9827 struct S { struct S *p; };
9829 name lookup will find the TYPE_DECL for the implicit "S::S"
9830 typedef. Adjust for that here. */
9831 if (DECL_SELF_REFERENCE_P (decl))
9832 decl = TYPE_NAME (TREE_TYPE (decl));
9834 type = TREE_TYPE (decl);
9836 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9837 is false for this case as well. */
9838 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9840 error ("using template type parameter %qT after %qs",
9841 type, tag_name (tag_code));
9842 return error_mark_node;
9846 If the identifier resolves to a typedef-name or a template
9847 type-parameter, the elaborated-type-specifier is ill-formed.
9849 In other words, the only legitimate declaration to use in the
9850 elaborated type specifier is the implicit typedef created when
9851 the type is declared. */
9852 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9853 && tag_code != typename_type)
9855 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9856 error ("%q+D has a previous declaration here", decl);
9857 return error_mark_node;
9859 else if (TREE_CODE (type) != RECORD_TYPE
9860 && TREE_CODE (type) != UNION_TYPE
9861 && tag_code != enum_type
9862 && tag_code != typename_type)
9864 error ("%qT referred to as %qs", type, tag_name (tag_code));
9865 error ("%q+T has a previous declaration here", type);
9866 return error_mark_node;
9868 else if (TREE_CODE (type) != ENUMERAL_TYPE
9869 && tag_code == enum_type)
9871 error ("%qT referred to as enum", type);
9872 error ("%q+T has a previous declaration here", type);
9873 return error_mark_node;
9875 else if (!allow_template_p
9876 && TREE_CODE (type) == RECORD_TYPE
9877 && CLASSTYPE_IS_TEMPLATE (type))
9879 /* If a class template appears as elaborated type specifier
9880 without a template header such as:
9882 template <class T> class C {};
9883 void f(class C); // No template header here
9885 then the required template argument is missing. */
9886 error ("template argument required for %<%s %T%>",
9887 tag_name (tag_code),
9888 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9889 return error_mark_node;
9895 /* Lookup NAME in elaborate type specifier in scope according to
9896 SCOPE and issue diagnostics if necessary.
9897 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9898 found, and ERROR_MARK_NODE for type error. */
9901 lookup_and_check_tag (enum tag_types tag_code, tree name,
9902 tag_scope scope, bool template_header_p)
9906 if (scope == ts_global)
9908 /* First try ordinary name lookup, ignoring hidden class name
9909 injected via friend declaration. */
9910 decl = lookup_name_prefer_type (name, 2);
9911 /* If that fails, the name will be placed in the smallest
9912 non-class, non-function-prototype scope according to 3.3.1/5.
9913 We may already have a hidden name declared as friend in this
9914 scope. So lookup again but not ignoring hidden names.
9915 If we find one, that name will be made visible rather than
9916 creating a new tag. */
9918 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9921 decl = lookup_type_scope (name, scope);
9923 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9924 decl = DECL_TEMPLATE_RESULT (decl);
9926 if (decl && TREE_CODE (decl) == TYPE_DECL)
9928 /* Look for invalid nested type:
9932 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9934 error ("%qD has the same name as the class in which it is "
9937 return error_mark_node;
9940 /* Two cases we need to consider when deciding if a class
9941 template is allowed as an elaborated type specifier:
9942 1. It is a self reference to its own class.
9943 2. It comes with a template header.
9947 template <class T> class C {
9948 class C *c1; // DECL_SELF_REFERENCE_P is true
9951 template <class U> class C; // template_header_p is true
9952 template <class T> class C<T>::D {
9953 class C *c2; // DECL_SELF_REFERENCE_P is true
9956 t = check_elaborated_type_specifier (tag_code,
9959 | DECL_SELF_REFERENCE_P (decl));
9962 else if (decl && TREE_CODE (decl) == TREE_LIST)
9964 error ("reference to %qD is ambiguous", name);
9965 print_candidates (decl);
9966 return error_mark_node;
9972 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9973 Define the tag as a forward-reference if it is not defined.
9975 If a declaration is given, process it here, and report an error if
9976 multiple declarations are not identical.
9978 SCOPE is TS_CURRENT when this is also a definition. Only look in
9979 the current frame for the name (since C++ allows new names in any
9980 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9981 declaration. Only look beginning from the current scope outward up
9982 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9984 TEMPLATE_HEADER_P is true when this declaration is preceded by
9985 a set of template parameters. */
9988 xref_tag (enum tag_types tag_code, tree name,
9989 tag_scope scope, bool template_header_p)
9991 enum tree_code code;
9993 tree context = NULL_TREE;
9995 timevar_push (TV_NAME_LOOKUP);
9997 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10003 code = RECORD_TYPE;
10009 code = ENUMERAL_TYPE;
10012 gcc_unreachable ();
10015 /* In case of anonymous name, xref_tag is only called to
10016 make type node and push name. Name lookup is not required. */
10017 if (ANON_AGGRNAME_P (name))
10020 t = lookup_and_check_tag (tag_code, name,
10021 scope, template_header_p);
10023 if (t == error_mark_node)
10024 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10026 if (scope != ts_current && t && current_class_type
10027 && template_class_depth (current_class_type)
10028 && template_header_p)
10030 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10031 definition of this tag. Since, in addition, we are currently
10032 processing a (member) template declaration of a template
10033 class, we must be very careful; consider:
10040 { template <class V>
10041 friend struct S1; };
10043 Here, the S2::S1 declaration should not be confused with the
10044 outer declaration. In particular, the inner version should
10045 have a template parameter of level 2, not level 1. This
10046 would be particularly important if the member declaration
10049 template <class V = U> friend struct S1;
10051 say, when we should tsubst into `U' when instantiating
10052 S2. On the other hand, when presented with:
10062 we must find the inner binding eventually. We
10063 accomplish this by making sure that the new type we
10064 create to represent this declaration has the right
10066 context = TYPE_CONTEXT (t);
10072 /* If no such tag is yet defined, create a forward-reference node
10073 and record it as the "definition".
10074 When a real declaration of this type is found,
10075 the forward-reference will be altered into a real type. */
10076 if (code == ENUMERAL_TYPE)
10078 error ("use of enum %q#D without previous declaration", name);
10079 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10083 t = make_aggr_type (code);
10084 TYPE_CONTEXT (t) = context;
10085 t = pushtag (name, t, scope);
10090 if (template_header_p && IS_AGGR_TYPE (t))
10092 if (!redeclare_class_template (t, current_template_parms))
10093 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10095 else if (!processing_template_decl
10096 && CLASS_TYPE_P (t)
10097 && CLASSTYPE_IS_TEMPLATE (t))
10099 error ("redeclaration of %qT as a non-template", t);
10100 error ("previous declaration %q+D", t);
10101 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10104 /* Make injected friend class visible. */
10105 if (scope != ts_within_enclosing_non_class
10106 && hidden_name_p (TYPE_NAME (t)))
10108 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10109 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10111 if (TYPE_TEMPLATE_INFO (t))
10113 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10114 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10119 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10123 xref_tag_from_type (tree old, tree id, tag_scope scope)
10125 enum tag_types tag_kind;
10127 if (TREE_CODE (old) == RECORD_TYPE)
10128 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10130 tag_kind = union_type;
10132 if (id == NULL_TREE)
10133 id = TYPE_IDENTIFIER (old);
10135 return xref_tag (tag_kind, id, scope, false);
10138 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10139 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10140 access_* node, and the TREE_VALUE is the type of the base-class.
10141 Non-NULL TREE_TYPE indicates virtual inheritance.
10143 Returns true if the binfo hierarchy was successfully created,
10144 false if an error was detected. */
10147 xref_basetypes (tree ref, tree base_list)
10150 tree binfo, base_binfo;
10151 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10152 unsigned max_bases = 0; /* Maximum direct bases. */
10154 tree default_access;
10155 tree igo_prev; /* Track Inheritance Graph Order. */
10157 if (ref == error_mark_node)
10160 /* The base of a derived class is private by default, all others are
10162 default_access = (TREE_CODE (ref) == RECORD_TYPE
10163 && CLASSTYPE_DECLARED_CLASS (ref)
10164 ? access_private_node : access_public_node);
10166 /* First, make sure that any templates in base-classes are
10167 instantiated. This ensures that if we call ourselves recursively
10168 we do not get confused about which classes are marked and which
10170 basep = &base_list;
10173 tree basetype = TREE_VALUE (*basep);
10175 if (!(processing_template_decl && uses_template_parms (basetype))
10176 && !complete_type_or_else (basetype, NULL))
10177 /* An incomplete type. Remove it from the list. */
10178 *basep = TREE_CHAIN (*basep);
10182 if (TREE_TYPE (*basep))
10184 if (CLASS_TYPE_P (basetype))
10185 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10186 basep = &TREE_CHAIN (*basep);
10190 TYPE_MARKED_P (ref) = 1;
10192 /* The binfo slot should be empty, unless this is an (ill-formed)
10194 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10195 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10197 binfo = make_tree_binfo (max_bases);
10199 TYPE_BINFO (ref) = binfo;
10200 BINFO_OFFSET (binfo) = size_zero_node;
10201 BINFO_TYPE (binfo) = ref;
10205 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10206 /* An aggregate cannot have baseclasses. */
10207 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10209 if (TREE_CODE (ref) == UNION_TYPE)
10211 error ("derived union %qT invalid", ref);
10218 if (TYPE_FOR_JAVA (ref))
10220 error ("Java class %qT cannot have multiple bases", ref);
10227 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10229 if (TYPE_FOR_JAVA (ref))
10231 error ("Java class %qT cannot have virtual bases", ref);
10236 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10238 tree access = TREE_PURPOSE (base_list);
10239 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10240 tree basetype = TREE_VALUE (base_list);
10242 if (access == access_default_node)
10243 access = default_access;
10245 if (PACK_EXPANSION_P (basetype))
10246 basetype = PACK_EXPANSION_PATTERN (basetype);
10247 if (TREE_CODE (basetype) == TYPE_DECL)
10248 basetype = TREE_TYPE (basetype);
10249 if (TREE_CODE (basetype) != RECORD_TYPE
10250 && TREE_CODE (basetype) != TYPENAME_TYPE
10251 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10252 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10254 error ("base type %qT fails to be a struct or class type",
10259 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10260 TYPE_FOR_JAVA (ref) = 1;
10262 base_binfo = NULL_TREE;
10263 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10265 base_binfo = TYPE_BINFO (basetype);
10266 /* The original basetype could have been a typedef'd type. */
10267 basetype = BINFO_TYPE (base_binfo);
10269 /* Inherit flags from the base. */
10270 TYPE_HAS_NEW_OPERATOR (ref)
10271 |= TYPE_HAS_NEW_OPERATOR (basetype);
10272 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10273 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10274 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10275 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10276 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10277 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10278 CLASSTYPE_REPEATED_BASE_P (ref)
10279 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10282 /* We must do this test after we've seen through a typedef
10284 if (TYPE_MARKED_P (basetype))
10286 if (basetype == ref)
10287 error ("recursive type %qT undefined", basetype);
10289 error ("duplicate base type %qT invalid", basetype);
10293 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10294 /* Regenerate the pack expansion for the bases. */
10295 basetype = make_pack_expansion (basetype);
10297 TYPE_MARKED_P (basetype) = 1;
10299 base_binfo = copy_binfo (base_binfo, basetype, ref,
10300 &igo_prev, via_virtual);
10301 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10302 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10304 BINFO_BASE_APPEND (binfo, base_binfo);
10305 BINFO_BASE_ACCESS_APPEND (binfo, access);
10308 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10309 /* If we have space in the vbase vector, we must have shared at
10310 least one of them, and are therefore diamond shaped. */
10311 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10313 /* Unmark all the types. */
10314 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10315 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10316 TYPE_MARKED_P (ref) = 0;
10318 /* Now see if we have a repeated base type. */
10319 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10321 for (base_binfo = binfo; base_binfo;
10322 base_binfo = TREE_CHAIN (base_binfo))
10324 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10326 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10329 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10331 for (base_binfo = binfo; base_binfo;
10332 base_binfo = TREE_CHAIN (base_binfo))
10333 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10334 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10343 /* Begin compiling the definition of an enumeration type.
10345 Returns the type object, as yet incomplete.
10346 Also records info about it so that build_enumerator
10347 may be used to declare the individual values as they are read. */
10350 start_enum (tree name)
10354 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10356 /* If this is the real definition for a previous forward reference,
10357 fill in the contents in the same object that used to be the
10358 forward reference. */
10360 enumtype = lookup_and_check_tag (enum_type, name,
10361 /*tag_scope=*/ts_current,
10362 /*template_header_p=*/false);
10364 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10366 error ("multiple definition of %q#T", enumtype);
10367 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10368 /* Clear out TYPE_VALUES, and start again. */
10369 TYPE_VALUES (enumtype) = NULL_TREE;
10373 /* In case of error, make a dummy enum to allow parsing to
10375 if (enumtype == error_mark_node)
10376 name = make_anon_name ();
10378 enumtype = make_node (ENUMERAL_TYPE);
10379 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10385 /* After processing and defining all the values of an enumeration type,
10386 install their decls in the enumeration type and finish it off.
10387 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10390 finish_enum (tree enumtype)
10399 bool use_short_enum;
10403 integer_type_kind itk;
10404 tree underlying_type = NULL_TREE;
10406 /* We built up the VALUES in reverse order. */
10407 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10409 /* For an enum defined in a template, just set the type of the values;
10410 all further processing is postponed until the template is
10411 instantiated. We need to set the type so that tsubst of a CONST_DECL
10413 if (processing_template_decl)
10415 for (values = TYPE_VALUES (enumtype);
10417 values = TREE_CHAIN (values))
10418 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10419 if (at_function_scope_p ())
10420 add_stmt (build_min (TAG_DEFN, enumtype));
10424 /* Determine the minimum and maximum values of the enumerators. */
10425 if (TYPE_VALUES (enumtype))
10427 minnode = maxnode = NULL_TREE;
10429 for (values = TYPE_VALUES (enumtype);
10431 values = TREE_CHAIN (values))
10433 decl = TREE_VALUE (values);
10435 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10436 each enumerator has the type of its enumeration. Prior to the
10437 closing brace, the type of each enumerator is the type of its
10438 initializing value. */
10439 TREE_TYPE (decl) = enumtype;
10441 /* Update the minimum and maximum values, if appropriate. */
10442 value = DECL_INITIAL (decl);
10443 if (value == error_mark_node)
10444 value = integer_zero_node;
10445 /* Figure out what the minimum and maximum values of the
10446 enumerators are. */
10448 minnode = maxnode = value;
10449 else if (tree_int_cst_lt (maxnode, value))
10451 else if (tree_int_cst_lt (value, minnode))
10458 If the enumerator-list is empty, the underlying type is as if
10459 the enumeration had a single enumerator with value 0. */
10460 minnode = maxnode = integer_zero_node;
10462 /* Compute the number of bits require to represent all values of the
10463 enumeration. We must do this before the type of MINNODE and
10464 MAXNODE are transformed, since min_precision relies on the
10465 TREE_TYPE of the value it is passed. */
10466 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10467 lowprec = min_precision (minnode, unsignedp);
10468 highprec = min_precision (maxnode, unsignedp);
10469 precision = MAX (lowprec, highprec);
10471 /* Determine the underlying type of the enumeration.
10475 The underlying type of an enumeration is an integral type that
10476 can represent all the enumerator values defined in the
10477 enumeration. It is implementation-defined which integral type is
10478 used as the underlying type for an enumeration except that the
10479 underlying type shall not be larger than int unless the value of
10480 an enumerator cannot fit in an int or unsigned int.
10482 We use "int" or an "unsigned int" as the underlying type, even if
10483 a smaller integral type would work, unless the user has
10484 explicitly requested that we use the smallest possible type. The
10485 user can request that for all enumerations with a command line
10486 flag, or for just one enumeration with an attribute. */
10488 use_short_enum = flag_short_enums
10489 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10491 for (itk = (use_short_enum ? itk_char : itk_int);
10495 underlying_type = integer_types[itk];
10496 if (TYPE_PRECISION (underlying_type) >= precision
10497 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10500 if (itk == itk_none)
10504 IF no integral type can represent all the enumerator values, the
10505 enumeration is ill-formed. */
10506 error ("no integral type can represent all of the enumerator values "
10507 "for %qT", enumtype);
10508 precision = TYPE_PRECISION (long_long_integer_type_node);
10509 underlying_type = integer_types[itk_unsigned_long_long];
10512 /* Compute the minium and maximum values for the type.
10516 For an enumeration where emin is the smallest enumerator and emax
10517 is the largest, the values of the enumeration are the values of the
10518 underlying type in the range bmin to bmax, where bmin and bmax are,
10519 respectively, the smallest and largest values of the smallest bit-
10520 field that can store emin and emax. */
10522 /* The middle-end currently assumes that types with TYPE_PRECISION
10523 narrower than their underlying type are suitably zero or sign
10524 extended to fill their mode. g++ doesn't make these guarantees.
10525 Until the middle-end can represent such paradoxical types, we
10526 set the TYPE_PRECISION to the width of the underlying type. */
10527 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10529 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10533 The value of sizeof() applied to an enumeration type, an object
10534 of an enumeration type, or an enumerator, is the value of sizeof()
10535 applied to the underlying type. */
10536 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10537 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10538 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10539 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10540 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10541 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10543 /* Convert each of the enumerators to the type of the underlying
10544 type of the enumeration. */
10545 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10547 location_t saved_location;
10549 decl = TREE_VALUE (values);
10550 saved_location = input_location;
10551 input_location = DECL_SOURCE_LOCATION (decl);
10552 value = perform_implicit_conversion (underlying_type,
10553 DECL_INITIAL (decl));
10554 input_location = saved_location;
10556 /* Do not clobber shared ints. */
10557 value = copy_node (value);
10559 TREE_TYPE (value) = enumtype;
10560 DECL_INITIAL (decl) = value;
10561 TREE_VALUE (values) = value;
10564 /* Fix up all variant types of this enum type. */
10565 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10567 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10568 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10569 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10570 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10571 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10572 TYPE_MODE (t) = TYPE_MODE (enumtype);
10573 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10574 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10575 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10576 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10579 /* Finish debugging output for this type. */
10580 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10583 /* Build and install a CONST_DECL for an enumeration constant of the
10584 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10585 Assignment of sequential values by default is handled here. */
10588 build_enumerator (tree name, tree value, tree enumtype)
10594 /* If the VALUE was erroneous, pretend it wasn't there; that will
10595 result in the enum being assigned the next value in sequence. */
10596 if (value == error_mark_node)
10599 /* Remove no-op casts from the value. */
10601 STRIP_TYPE_NOPS (value);
10603 if (! processing_template_decl)
10605 /* Validate and default VALUE. */
10606 if (value != NULL_TREE)
10608 value = integral_constant_value (value);
10610 if (TREE_CODE (value) == INTEGER_CST)
10612 value = perform_integral_promotions (value);
10613 constant_expression_warning (value);
10617 error ("enumerator value for %qD is not an integer constant", name);
10622 /* Default based on previous value. */
10623 if (value == NULL_TREE)
10625 if (TYPE_VALUES (enumtype))
10628 unsigned HOST_WIDE_INT lo;
10632 /* The next value is the previous value plus one. We can
10633 safely assume that the previous value is an INTEGER_CST.
10634 add_double doesn't know the type of the target expression,
10635 so we must check with int_fits_type_p as well. */
10636 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10637 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10638 TREE_INT_CST_HIGH (prev_value),
10640 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10641 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10645 error ("overflow in enumeration values at %qD", name);
10646 value = error_mark_node;
10650 value = integer_zero_node;
10653 /* Remove no-op casts from the value. */
10654 STRIP_TYPE_NOPS (value);
10657 /* C++ associates enums with global, function, or class declarations. */
10658 context = current_scope ();
10660 /* Build the actual enumeration constant. Note that the enumeration
10661 constants have the type of their initializers until the
10662 enumeration is complete:
10666 Following the closing brace of an enum-specifier, each enumer-
10667 ator has the type of its enumeration. Prior to the closing
10668 brace, the type of each enumerator is the type of its
10669 initializing value.
10671 In finish_enum we will reset the type. Of course, if we're
10672 processing a template, there may be no value. */
10673 type = value ? TREE_TYPE (value) : NULL_TREE;
10675 if (context && context == current_class_type)
10676 /* This enum declaration is local to the class. We need the full
10677 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10678 decl = build_lang_decl (CONST_DECL, name, type);
10680 /* It's a global enum, or it's local to a function. (Note local to
10681 a function could mean local to a class method. */
10682 decl = build_decl (CONST_DECL, name, type);
10684 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10685 TREE_CONSTANT (decl) = 1;
10686 TREE_INVARIANT (decl) = 1;
10687 TREE_READONLY (decl) = 1;
10688 DECL_INITIAL (decl) = value;
10690 if (context && context == current_class_type)
10691 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10692 on the TYPE_FIELDS list for `S'. (That's so that you can say
10693 things like `S::i' later.) */
10694 finish_member_declaration (decl);
10698 /* Add this enumeration constant to the list for this type. */
10699 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10703 /* We're defining DECL. Make sure that it's type is OK. */
10706 check_function_type (tree decl, tree current_function_parms)
10708 tree fntype = TREE_TYPE (decl);
10709 tree return_type = complete_type (TREE_TYPE (fntype));
10711 /* In a function definition, arg types must be complete. */
10712 require_complete_types_for_parms (current_function_parms);
10714 if (dependent_type_p (return_type))
10716 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10718 tree args = TYPE_ARG_TYPES (fntype);
10720 error ("return type %q#T is incomplete", return_type);
10722 /* Make it return void instead. */
10723 if (TREE_CODE (fntype) == METHOD_TYPE)
10724 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10726 TREE_CHAIN (args));
10728 fntype = build_function_type (void_type_node, args);
10730 = build_exception_variant (fntype,
10731 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10734 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10737 /* Create the FUNCTION_DECL for a function definition.
10738 DECLSPECS and DECLARATOR are the parts of the declaration;
10739 they describe the function's name and the type it returns,
10740 but twisted together in a fashion that parallels the syntax of C.
10742 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10743 DECLARATOR is really the DECL for the function we are about to
10744 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10745 indicating that the function is an inline defined in-class.
10747 This function creates a binding context for the function body
10748 as well as setting up the FUNCTION_DECL in current_function_decl.
10750 For C++, we must first check whether that datum makes any sense.
10751 For example, "class A local_a(1,2);" means that variable local_a
10752 is an aggregate of type A, which should have a constructor
10753 applied to it with the argument list [1, 2].
10755 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
10756 or may be a BLOCK if the function has been defined previously
10757 in this translation unit. On exit, DECL_INITIAL (decl1) will be
10758 error_mark_node if the function has never been defined, or
10759 a BLOCK if the function has been defined somewhere. */
10762 start_preparsed_function (tree decl1, tree attrs, int flags)
10764 tree ctype = NULL_TREE;
10767 int doing_friend = 0;
10768 struct cp_binding_level *bl;
10769 tree current_function_parms;
10770 struct c_fileinfo *finfo
10771 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
10772 bool honor_interface;
10774 /* Sanity check. */
10775 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10776 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10778 fntype = TREE_TYPE (decl1);
10779 if (TREE_CODE (fntype) == METHOD_TYPE)
10780 ctype = TYPE_METHOD_BASETYPE (fntype);
10782 /* ISO C++ 11.4/5. A friend function defined in a class is in
10783 the (lexical) scope of the class in which it is defined. */
10784 if (!ctype && DECL_FRIEND_P (decl1))
10786 ctype = DECL_FRIEND_CONTEXT (decl1);
10788 /* CTYPE could be null here if we're dealing with a template;
10789 for example, `inline friend float foo()' inside a template
10790 will have no CTYPE set. */
10791 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10797 if (DECL_DECLARED_INLINE_P (decl1)
10798 && lookup_attribute ("noinline", attrs))
10799 warning (0, "inline function %q+D given attribute noinline", decl1);
10801 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10802 /* This is a constructor, we must ensure that any default args
10803 introduced by this definition are propagated to the clones
10804 now. The clones are used directly in overload resolution. */
10805 adjust_clone_args (decl1);
10807 /* Sometimes we don't notice that a function is a static member, and
10808 build a METHOD_TYPE for it. Fix that up now. */
10809 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10810 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10812 revert_static_member_fn (decl1);
10816 /* Set up current_class_type, and enter the scope of the class, if
10819 push_nested_class (ctype);
10820 else if (DECL_STATIC_FUNCTION_P (decl1))
10821 push_nested_class (DECL_CONTEXT (decl1));
10823 /* Now that we have entered the scope of the class, we must restore
10824 the bindings for any template parameters surrounding DECL1, if it
10825 is an inline member template. (Order is important; consider the
10826 case where a template parameter has the same name as a field of
10827 the class.) It is not until after this point that
10828 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10829 if (flags & SF_INCLASS_INLINE)
10830 maybe_begin_member_template_processing (decl1);
10832 /* Effective C++ rule 15. */
10834 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10835 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10836 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
10838 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10839 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10840 if (!DECL_INITIAL (decl1))
10841 DECL_INITIAL (decl1) = error_mark_node;
10843 /* This function exists in static storage.
10844 (This does not mean `static' in the C sense!) */
10845 TREE_STATIC (decl1) = 1;
10847 /* We must call push_template_decl after current_class_type is set
10848 up. (If we are processing inline definitions after exiting a
10849 class scope, current_class_type will be NULL_TREE until set above
10850 by push_nested_class.) */
10851 if (processing_template_decl)
10853 /* FIXME: Handle error_mark_node more gracefully. */
10854 tree newdecl1 = push_template_decl (decl1);
10855 if (newdecl1 != error_mark_node)
10859 /* We are now in the scope of the function being defined. */
10860 current_function_decl = decl1;
10862 /* Save the parm names or decls from this function's declarator
10863 where store_parm_decls will find them. */
10864 current_function_parms = DECL_ARGUMENTS (decl1);
10866 /* Make sure the parameter and return types are reasonable. When
10867 you declare a function, these types can be incomplete, but they
10868 must be complete when you define the function. */
10869 check_function_type (decl1, current_function_parms);
10871 /* Build the return declaration for the function. */
10872 restype = TREE_TYPE (fntype);
10873 if (DECL_RESULT (decl1) == NULL_TREE)
10877 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10878 DECL_ARTIFICIAL (resdecl) = 1;
10879 DECL_IGNORED_P (resdecl) = 1;
10880 DECL_RESULT (decl1) = resdecl;
10882 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10885 /* Let the user know we're compiling this function. */
10886 announce_function (decl1);
10888 /* Record the decl so that the function name is defined.
10889 If we already have a decl for this name, and it is a FUNCTION_DECL,
10890 use the old decl. */
10891 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10893 /* A specialization is not used to guide overload resolution. */
10894 if (!DECL_FUNCTION_MEMBER_P (decl1)
10895 && !(DECL_USE_TEMPLATE (decl1) &&
10896 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10898 tree olddecl = pushdecl (decl1);
10900 if (olddecl == error_mark_node)
10901 /* If something went wrong when registering the declaration,
10902 use DECL1; we have to have a FUNCTION_DECL to use when
10903 parsing the body of the function. */
10907 /* Otherwise, OLDDECL is either a previous declaration
10908 of the same function or DECL1 itself. */
10910 if (warn_missing_declarations
10911 && olddecl == decl1
10912 && !DECL_MAIN_P (decl1)
10913 && TREE_PUBLIC (decl1)
10914 && !DECL_DECLARED_INLINE_P (decl1))
10918 /* Check whether DECL1 is in an anonymous
10920 for (context = DECL_CONTEXT (decl1);
10922 context = DECL_CONTEXT (context))
10924 if (TREE_CODE (context) == NAMESPACE_DECL
10925 && DECL_NAME (context) == NULL_TREE)
10929 if (context == NULL)
10930 warning (OPT_Wmissing_declarations,
10931 "no previous declaration for %q+D", decl1);
10939 /* We need to set the DECL_CONTEXT. */
10940 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10941 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10943 fntype = TREE_TYPE (decl1);
10945 /* If #pragma weak applies, mark the decl appropriately now.
10946 The pragma only applies to global functions. Because
10947 determining whether or not the #pragma applies involves
10948 computing the mangled name for the declaration, we cannot
10949 apply the pragma until after we have merged this declaration
10950 with any previous declarations; if the original declaration
10951 has a linkage specification, that specification applies to
10952 the definition as well, and may affect the mangled name. */
10953 if (!DECL_CONTEXT (decl1))
10954 maybe_apply_pragma_weak (decl1);
10957 /* Reset this in case the call to pushdecl changed it. */
10958 current_function_decl = decl1;
10960 gcc_assert (DECL_INITIAL (decl1));
10962 /* This function may already have been parsed, in which case just
10963 return; our caller will skip over the body without parsing. */
10964 if (DECL_INITIAL (decl1) != error_mark_node)
10967 /* Initialize RTL machinery. We cannot do this until
10968 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10969 even when processing a template; this is how we get
10970 CFUN set up, and our per-function variables initialized.
10971 FIXME factor out the non-RTL stuff. */
10972 bl = current_binding_level;
10973 allocate_struct_function (decl1);
10974 current_binding_level = bl;
10976 /* Even though we're inside a function body, we still don't want to
10977 call expand_expr to calculate the size of a variable-sized array.
10978 We haven't necessarily assigned RTL to all variables yet, so it's
10979 not safe to try to expand expressions involving them. */
10980 cfun->x_dont_save_pending_sizes_p = 1;
10982 /* Start the statement-tree, start the tree now. */
10983 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10985 /* If we are (erroneously) defining a function that we have already
10986 defined before, wipe out what we knew before. */
10987 if (!DECL_PENDING_INLINE_P (decl1))
10988 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10990 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10992 /* We know that this was set up by `grokclassfn'. We do not
10993 wait until `store_parm_decls', since evil parse errors may
10994 never get us to that point. Here we keep the consistency
10995 between `current_class_type' and `current_class_ptr'. */
10996 tree t = DECL_ARGUMENTS (decl1);
10998 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10999 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11001 cp_function_chain->x_current_class_ref
11002 = build_indirect_ref (t, NULL);
11003 cp_function_chain->x_current_class_ptr = t;
11005 /* Constructors and destructors need to know whether they're "in
11006 charge" of initializing virtual base classes. */
11007 t = TREE_CHAIN (t);
11008 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11010 current_in_charge_parm = t;
11011 t = TREE_CHAIN (t);
11013 if (DECL_HAS_VTT_PARM_P (decl1))
11015 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11016 current_vtt_parm = t;
11020 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11021 /* Implicitly-defined methods (like the
11022 destructor for a class in which no destructor
11023 is explicitly declared) must not be defined
11024 until their definition is needed. So, we
11025 ignore interface specifications for
11026 compiler-generated functions. */
11027 && !DECL_ARTIFICIAL (decl1));
11029 if (DECL_INTERFACE_KNOWN (decl1))
11031 tree ctx = decl_function_context (decl1);
11033 if (DECL_NOT_REALLY_EXTERN (decl1))
11034 DECL_EXTERNAL (decl1) = 0;
11036 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11037 && TREE_PUBLIC (ctx))
11038 /* This is a function in a local class in an extern inline
11040 comdat_linkage (decl1);
11042 /* If this function belongs to an interface, it is public.
11043 If it belongs to someone else's interface, it is also external.
11044 This only affects inlines and template instantiations. */
11045 else if (!finfo->interface_unknown && honor_interface)
11047 if (DECL_DECLARED_INLINE_P (decl1)
11048 || DECL_TEMPLATE_INSTANTIATION (decl1)
11049 || processing_template_decl)
11051 DECL_EXTERNAL (decl1)
11052 = (finfo->interface_only
11053 || (DECL_DECLARED_INLINE_P (decl1)
11054 && ! flag_implement_inlines
11055 && !DECL_VINDEX (decl1)));
11057 /* For WIN32 we also want to put these in linkonce sections. */
11058 maybe_make_one_only (decl1);
11061 DECL_EXTERNAL (decl1) = 0;
11062 DECL_INTERFACE_KNOWN (decl1) = 1;
11063 /* If this function is in an interface implemented in this file,
11064 make sure that the back end knows to emit this function
11066 if (!DECL_EXTERNAL (decl1))
11067 mark_needed (decl1);
11069 else if (finfo->interface_unknown && finfo->interface_only
11070 && honor_interface)
11072 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11073 interface, we will have both finfo->interface_unknown and
11074 finfo->interface_only set. In that case, we don't want to
11075 use the normal heuristics because someone will supply a
11076 #pragma implementation elsewhere, and deducing it here would
11077 produce a conflict. */
11078 comdat_linkage (decl1);
11079 DECL_EXTERNAL (decl1) = 0;
11080 DECL_INTERFACE_KNOWN (decl1) = 1;
11081 DECL_DEFER_OUTPUT (decl1) = 1;
11085 /* This is a definition, not a reference.
11086 So clear DECL_EXTERNAL. */
11087 DECL_EXTERNAL (decl1) = 0;
11089 if ((DECL_DECLARED_INLINE_P (decl1)
11090 || DECL_TEMPLATE_INSTANTIATION (decl1))
11091 && ! DECL_INTERFACE_KNOWN (decl1)
11092 /* Don't try to defer nested functions for now. */
11093 && ! decl_function_context (decl1))
11094 DECL_DEFER_OUTPUT (decl1) = 1;
11096 DECL_INTERFACE_KNOWN (decl1) = 1;
11099 /* Determine the ELF visibility attribute for the function. We must not
11100 do this before calling "pushdecl", as we must allow "duplicate_decls"
11101 to merge any attributes appropriately. We also need to wait until
11103 if (!DECL_CLONED_FUNCTION_P (decl1))
11104 determine_visibility (decl1);
11106 begin_scope (sk_function_parms, decl1);
11110 if (DECL_DESTRUCTOR_P (decl1)
11111 || (DECL_CONSTRUCTOR_P (decl1)
11112 && targetm.cxx.cdtor_returns_this ()))
11114 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11115 DECL_CONTEXT (cdtor_label) = current_function_decl;
11118 start_fname_decls ();
11120 store_parm_decls (current_function_parms);
11124 /* Like start_preparsed_function, except that instead of a
11125 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11127 Returns 1 on success. If the DECLARATOR is not suitable for a function
11128 (it defines a datum instead), we return 0, which tells
11129 yyparse to report a parse error. */
11132 start_function (cp_decl_specifier_seq *declspecs,
11133 const cp_declarator *declarator,
11138 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11139 /* If the declarator is not suitable for a function definition,
11140 cause a syntax error. */
11141 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11144 if (DECL_MAIN_P (decl1))
11145 /* main must return int. grokfndecl should have corrected it
11146 (and issued a diagnostic) if the user got it wrong. */
11147 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11148 integer_type_node));
11150 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11155 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11159 use_eh_spec_block (tree fn)
11161 return (flag_exceptions && flag_enforce_eh_specs
11162 && !processing_template_decl
11163 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11164 /* We insert the EH_SPEC_BLOCK only in the original
11165 function; then, it is copied automatically to the
11167 && !DECL_CLONED_FUNCTION_P (fn)
11168 /* Implicitly-generated constructors and destructors have
11169 exception specifications. However, those specifications
11170 are the union of the possible exceptions specified by the
11171 constructors/destructors for bases and members, so no
11172 unallowed exception will ever reach this function. By
11173 not creating the EH_SPEC_BLOCK we save a little memory,
11174 and we avoid spurious warnings about unreachable
11176 && !DECL_ARTIFICIAL (fn));
11179 /* Store the parameter declarations into the current function declaration.
11180 This is called after parsing the parameter declarations, before
11181 digesting the body of the function.
11183 Also install to binding contour return value identifier, if any. */
11186 store_parm_decls (tree current_function_parms)
11188 tree fndecl = current_function_decl;
11191 /* This is a chain of any other decls that came in among the parm
11192 declarations. If a parm is declared with enum {foo, bar} x;
11193 then CONST_DECLs for foo and bar are put here. */
11194 tree nonparms = NULL_TREE;
11196 if (current_function_parms)
11198 /* This case is when the function was defined with an ANSI prototype.
11199 The parms already have decls, so we need not do anything here
11200 except record them as in effect
11201 and complain if any redundant old-style parm decls were written. */
11203 tree specparms = current_function_parms;
11206 /* Must clear this because it might contain TYPE_DECLs declared
11208 current_binding_level->names = NULL;
11210 /* If we're doing semantic analysis, then we'll call pushdecl
11211 for each of these. We must do them in reverse order so that
11212 they end in the correct forward order. */
11213 specparms = nreverse (specparms);
11215 for (parm = specparms; parm; parm = next)
11217 next = TREE_CHAIN (parm);
11218 if (TREE_CODE (parm) == PARM_DECL)
11220 if (DECL_NAME (parm) == NULL_TREE
11221 || TREE_CODE (parm) != VOID_TYPE)
11224 error ("parameter %qD declared void", parm);
11228 /* If we find an enum constant or a type tag,
11229 put it aside for the moment. */
11230 TREE_CHAIN (parm) = NULL_TREE;
11231 nonparms = chainon (nonparms, parm);
11235 /* Get the decls in their original chain order and record in the
11236 function. This is all and only the PARM_DECLs that were
11237 pushed into scope by the loop above. */
11238 DECL_ARGUMENTS (fndecl) = getdecls ();
11241 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11243 /* Now store the final chain of decls for the arguments
11244 as the decl-chain of the current lexical scope.
11245 Put the enumerators in as well, at the front so that
11246 DECL_ARGUMENTS is not modified. */
11247 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11249 if (use_eh_spec_block (current_function_decl))
11250 current_eh_spec_block = begin_eh_spec_block ();
11254 /* We have finished doing semantic analysis on DECL, but have not yet
11255 generated RTL for its body. Save away our current state, so that
11256 when we want to generate RTL later we know what to do. */
11259 save_function_data (tree decl)
11261 struct language_function *f;
11263 /* Save the language-specific per-function data so that we can
11264 get it back when we really expand this function. */
11265 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11268 f = GGC_NEW (struct language_function);
11269 memcpy (f, cp_function_chain, sizeof (struct language_function));
11270 DECL_SAVED_FUNCTION_DATA (decl) = f;
11272 /* Clear out the bits we don't need. */
11273 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11274 f->bindings = NULL;
11275 f->x_local_names = NULL;
11279 /* Set the return value of the constructor (if present). */
11282 finish_constructor_body (void)
11287 if (targetm.cxx.cdtor_returns_this ())
11289 /* Any return from a constructor will end up here. */
11290 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11292 val = DECL_ARGUMENTS (current_function_decl);
11293 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11294 DECL_RESULT (current_function_decl), val);
11295 /* Return the address of the object. */
11296 exprstmt = build_stmt (RETURN_EXPR, val);
11297 add_stmt (exprstmt);
11301 /* Do all the processing for the beginning of a destructor; set up the
11302 vtable pointers and cleanups for bases and members. */
11305 begin_destructor_body (void)
11307 tree compound_stmt;
11309 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11310 issued an error message. We still want to try to process the
11311 body of the function, but initialize_vtbl_ptrs will crash if
11312 TYPE_BINFO is NULL. */
11313 if (COMPLETE_TYPE_P (current_class_type))
11315 compound_stmt = begin_compound_stmt (0);
11316 /* Make all virtual function table pointers in non-virtual base
11317 classes point to CURRENT_CLASS_TYPE's virtual function
11319 initialize_vtbl_ptrs (current_class_ptr);
11320 finish_compound_stmt (compound_stmt);
11322 /* And insert cleanups for our bases and members so that they
11323 will be properly destroyed if we throw. */
11324 push_base_cleanups ();
11328 /* At the end of every destructor we generate code to delete the object if
11329 necessary. Do that now. */
11332 finish_destructor_body (void)
11336 /* Any return from a destructor will end up here; that way all base
11337 and member cleanups will be run when the function returns. */
11338 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11340 /* In a virtual destructor, we must call delete. */
11341 if (DECL_VIRTUAL_P (current_function_decl))
11344 tree virtual_size = cxx_sizeof (current_class_type);
11348 At the point of definition of a virtual destructor (including
11349 an implicit definition), non-placement operator delete shall
11350 be looked up in the scope of the destructor's class and if
11351 found shall be accessible and unambiguous. */
11352 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11354 /*global_p=*/false,
11355 /*placement=*/NULL_TREE,
11356 /*alloc_fn=*/NULL_TREE);
11358 if_stmt = begin_if_stmt ();
11359 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11360 current_in_charge_parm,
11363 finish_expr_stmt (exprstmt);
11364 finish_then_clause (if_stmt);
11365 finish_if_stmt (if_stmt);
11368 if (targetm.cxx.cdtor_returns_this ())
11372 val = DECL_ARGUMENTS (current_function_decl);
11373 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11374 DECL_RESULT (current_function_decl), val);
11375 /* Return the address of the object. */
11376 exprstmt = build_stmt (RETURN_EXPR, val);
11377 add_stmt (exprstmt);
11381 /* Do the necessary processing for the beginning of a function body, which
11382 in this case includes member-initializers, but not the catch clauses of
11383 a function-try-block. Currently, this means opening a binding level
11384 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11387 begin_function_body (void)
11391 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11394 if (processing_template_decl)
11395 /* Do nothing now. */;
11397 /* Always keep the BLOCK node associated with the outermost pair of
11398 curly braces of a function. These are needed for correct
11399 operation of dwarfout.c. */
11400 keep_next_level (true);
11402 stmt = begin_compound_stmt (BCS_FN_BODY);
11404 if (processing_template_decl)
11405 /* Do nothing now. */;
11406 else if (DECL_DESTRUCTOR_P (current_function_decl))
11407 begin_destructor_body ();
11412 /* Do the processing for the end of a function body. Currently, this means
11413 closing out the cleanups for fully-constructed bases and members, and in
11414 the case of the destructor, deleting the object if desired. Again, this
11415 is only meaningful for [cd]tors, since they are the only functions where
11416 there is a significant distinction between the main body and any
11417 function catch clauses. Handling, say, main() return semantics here
11418 would be wrong, as flowing off the end of a function catch clause for
11419 main() would also need to return 0. */
11422 finish_function_body (tree compstmt)
11424 if (compstmt == NULL_TREE)
11427 /* Close the block. */
11428 finish_compound_stmt (compstmt);
11430 if (processing_template_decl)
11431 /* Do nothing now. */;
11432 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11433 finish_constructor_body ();
11434 else if (DECL_DESTRUCTOR_P (current_function_decl))
11435 finish_destructor_body ();
11438 /* Given a function, returns the BLOCK corresponding to the outermost level
11439 of curly braces, skipping the artificial block created for constructor
11443 outer_curly_brace_block (tree fndecl)
11445 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11446 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11447 /* Skip the artificial function body block. */
11448 block = BLOCK_SUBBLOCKS (block);
11452 /* Finish up a function declaration and compile that function
11453 all the way to assembler language output. The free the storage
11454 for the function definition.
11456 FLAGS is a bitwise or of the following values:
11458 We just finished processing the body of an in-class inline
11459 function definition. (This processing will have taken place
11460 after the class definition is complete.) */
11463 finish_function (int flags)
11465 tree fndecl = current_function_decl;
11466 tree fntype, ctype = NULL_TREE;
11467 int inclass_inline = (flags & 2) != 0;
11470 /* When we get some parse errors, we can end up without a
11471 current_function_decl, so cope. */
11472 if (fndecl == NULL_TREE)
11473 return error_mark_node;
11475 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11476 && DECL_VIRTUAL_P (fndecl)
11477 && !processing_template_decl)
11479 tree fnclass = DECL_CONTEXT (fndecl);
11480 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11481 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11484 nested = function_depth > 1;
11485 fntype = TREE_TYPE (fndecl);
11487 /* TREE_READONLY (fndecl) = 1;
11488 This caused &foo to be of type ptr-to-const-function
11489 which then got a warning when stored in a ptr-to-function variable. */
11491 gcc_assert (building_stmt_tree ());
11492 /* The current function is being defined, so its DECL_INITIAL should
11493 be set, and unless there's a multiple definition, it should be
11494 error_mark_node. */
11495 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11497 /* For a cloned function, we've already got all the code we need;
11498 there's no need to add any extra bits. */
11499 if (!DECL_CLONED_FUNCTION_P (fndecl))
11501 if (DECL_MAIN_P (current_function_decl))
11505 /* Make it so that `main' always returns 0 by default (or
11508 stmt = finish_return_stmt (integer_one_node);
11510 stmt = finish_return_stmt (integer_zero_node);
11512 /* Hack. We don't want the middle-end to warn that this
11513 return is unreachable, so put the statement on the
11515 #ifdef USE_MAPPED_LOCATION
11516 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
11518 annotate_with_file_line (stmt, input_filename, 0);
11522 if (use_eh_spec_block (current_function_decl))
11523 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11524 (TREE_TYPE (current_function_decl)),
11525 current_eh_spec_block);
11528 /* If we're saving up tree structure, tie off the function now. */
11529 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11531 finish_fname_decls ();
11533 /* If this function can't throw any exceptions, remember that. */
11534 if (!processing_template_decl
11535 && !cp_function_chain->can_throw
11536 && !flag_non_call_exceptions
11537 && !DECL_REPLACEABLE_P (fndecl))
11538 TREE_NOTHROW (fndecl) = 1;
11540 /* This must come after expand_function_end because cleanups might
11541 have declarations (from inline functions) that need to go into
11542 this function's blocks. */
11544 /* If the current binding level isn't the outermost binding level
11545 for this function, either there is a bug, or we have experienced
11546 syntax errors and the statement tree is malformed. */
11547 if (current_binding_level->kind != sk_function_parms)
11549 /* Make sure we have already experienced errors. */
11550 gcc_assert (errorcount);
11552 /* Throw away the broken statement tree and extra binding
11554 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11556 while (current_binding_level->kind != sk_function_parms)
11558 if (current_binding_level->kind == sk_class)
11559 pop_nested_class ();
11561 poplevel (0, 0, 0);
11564 poplevel (1, 0, 1);
11566 /* Statements should always be full-expressions at the outermost set
11567 of curly braces for a function. */
11568 gcc_assert (stmts_are_full_exprs_p ());
11570 /* Set up the named return value optimization, if we can. Candidate
11571 variables are selected in check_return_value. */
11572 if (current_function_return_value)
11574 tree r = current_function_return_value;
11577 if (r != error_mark_node
11578 /* This is only worth doing for fns that return in memory--and
11579 simpler, since we don't have to worry about promoted modes. */
11580 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11581 /* Only allow this for variables declared in the outer scope of
11582 the function so we know that their lifetime always ends with a
11583 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11584 we were to do this optimization in tree-ssa. */
11585 && (outer = outer_curly_brace_block (fndecl))
11586 && chain_member (r, BLOCK_VARS (outer)))
11587 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11589 current_function_return_value = NULL_TREE;
11592 /* Remember that we were in class scope. */
11593 if (current_class_name)
11594 ctype = current_class_type;
11596 /* Must mark the RESULT_DECL as being in this function. */
11597 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11599 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11600 to the FUNCTION_DECL node itself. */
11601 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11603 /* Save away current state, if appropriate. */
11604 if (!processing_template_decl)
11605 save_function_data (fndecl);
11607 /* Complain if there's just no return statement. */
11608 if (warn_return_type
11609 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11610 && !dependent_type_p (TREE_TYPE (fntype))
11611 && !current_function_returns_value && !current_function_returns_null
11612 /* Don't complain if we abort or throw. */
11613 && !current_function_returns_abnormally
11614 && !DECL_NAME (DECL_RESULT (fndecl))
11615 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11616 inline function, as we might never be compiled separately. */
11617 && (DECL_INLINE (fndecl) || processing_template_decl)
11618 /* Structor return values (if any) are set by the compiler. */
11619 && !DECL_CONSTRUCTOR_P (fndecl)
11620 && !DECL_DESTRUCTOR_P (fndecl))
11621 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11623 /* Store the end of the function, so that we get good line number
11624 info for the epilogue. */
11625 cfun->function_end_locus = input_location;
11627 /* Genericize before inlining. */
11628 if (!processing_template_decl)
11630 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11631 cp_genericize (fndecl);
11632 /* Clear out the bits we don't need. */
11633 f->x_current_class_ptr = NULL;
11634 f->x_current_class_ref = NULL;
11635 f->x_eh_spec_block = NULL;
11636 f->x_in_charge_parm = NULL;
11637 f->x_vtt_parm = NULL;
11638 f->x_return_value = NULL;
11639 f->bindings = NULL;
11640 f->extern_decl_map = NULL;
11642 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11643 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11645 /* Clear out the bits we don't need. */
11646 local_names = NULL;
11648 /* We're leaving the context of this function, so zap cfun. It's still in
11649 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11651 current_function_decl = NULL;
11653 /* If this is an in-class inline definition, we may have to pop the
11654 bindings for the template parameters that we added in
11655 maybe_begin_member_template_processing when start_function was
11657 if (inclass_inline)
11658 maybe_end_member_template_processing ();
11660 /* Leave the scope of the class. */
11662 pop_nested_class ();
11668 /* Let the error reporting routines know that we're outside a
11669 function. For a nested function, this value is used in
11670 cxx_pop_function_context and then reset via pop_function_context. */
11671 current_function_decl = NULL_TREE;
11676 /* Create the FUNCTION_DECL for a function definition.
11677 DECLSPECS and DECLARATOR are the parts of the declaration;
11678 they describe the return type and the name of the function,
11679 but twisted together in a fashion that parallels the syntax of C.
11681 This function creates a binding context for the function body
11682 as well as setting up the FUNCTION_DECL in current_function_decl.
11684 Returns a FUNCTION_DECL on success.
11686 If the DECLARATOR is not suitable for a function (it defines a datum
11687 instead), we return 0, which tells yyparse to report a parse error.
11689 May return void_type_node indicating that this method is actually
11690 a friend. See grokfield for more details.
11692 Came here with a `.pushlevel' .
11694 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11695 CHANGES TO CODE IN `grokfield'. */
11698 start_method (cp_decl_specifier_seq *declspecs,
11699 const cp_declarator *declarator, tree attrlist)
11701 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
11704 if (fndecl == error_mark_node)
11705 return error_mark_node;
11707 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
11709 error ("invalid member function declaration");
11710 return error_mark_node;
11714 cplus_decl_attributes (&fndecl, attrlist, 0);
11716 /* Pass friends other than inline friend functions back. */
11717 if (fndecl == void_type_node)
11720 if (DECL_IN_AGGR_P (fndecl))
11722 if (DECL_CONTEXT (fndecl)
11723 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
11724 error ("%qD is already defined in class %qT", fndecl,
11725 DECL_CONTEXT (fndecl));
11726 return error_mark_node;
11729 check_template_shadow (fndecl);
11731 DECL_DECLARED_INLINE_P (fndecl) = 1;
11732 if (flag_default_inline)
11733 DECL_INLINE (fndecl) = 1;
11735 /* We process method specializations in finish_struct_1. */
11736 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11738 fndecl = push_template_decl (fndecl);
11739 if (fndecl == error_mark_node)
11743 if (! DECL_FRIEND_P (fndecl))
11745 if (TREE_CHAIN (fndecl))
11747 fndecl = copy_node (fndecl);
11748 TREE_CHAIN (fndecl) = NULL_TREE;
11752 finish_decl (fndecl, NULL_TREE, NULL_TREE);
11754 /* Make a place for the parms. */
11755 begin_scope (sk_function_parms, fndecl);
11757 DECL_IN_AGGR_P (fndecl) = 1;
11761 /* Go through the motions of finishing a function definition.
11762 We don't compile this method until after the whole class has
11765 FINISH_METHOD must return something that looks as though it
11766 came from GROKFIELD (since we are defining a method, after all).
11768 This is called after parsing the body of the function definition.
11769 STMTS is the chain of statements that makes up the function body.
11771 DECL is the ..._DECL that `start_method' provided. */
11774 finish_method (tree decl)
11776 tree fndecl = decl;
11781 if (decl == void_type_node)
11784 old_initial = DECL_INITIAL (fndecl);
11786 /* Undo the level for the parms (from start_method).
11787 This is like poplevel, but it causes nothing to be
11788 saved. Saving information here confuses symbol-table
11789 output routines. Besides, this information will
11790 be correctly output when this method is actually
11793 /* Clear out the meanings of the local variables of this level;
11794 also record in each decl which block it belongs to. */
11796 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11798 if (DECL_NAME (link) != NULL_TREE)
11799 pop_binding (DECL_NAME (link), link);
11800 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11801 DECL_CONTEXT (link) = NULL_TREE;
11804 poplevel (0, 0, 0);
11806 DECL_INITIAL (fndecl) = old_initial;
11808 /* We used to check if the context of FNDECL was different from
11809 current_class_type as another way to get inside here. This didn't work
11810 for String.cc in libg++. */
11811 if (DECL_FRIEND_P (fndecl))
11813 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11815 decl = void_type_node;
11822 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11823 we can lay it out later, when and if its type becomes complete. */
11826 maybe_register_incomplete_var (tree var)
11828 gcc_assert (TREE_CODE (var) == VAR_DECL);
11830 /* Keep track of variables with incomplete types. */
11831 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11832 && DECL_EXTERNAL (var))
11834 tree inner_type = TREE_TYPE (var);
11836 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11837 inner_type = TREE_TYPE (inner_type);
11838 inner_type = TYPE_MAIN_VARIANT (inner_type);
11840 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11841 /* RTTI TD entries are created while defining the type_info. */
11842 || (TYPE_LANG_SPECIFIC (inner_type)
11843 && TYPE_BEING_DEFINED (inner_type)))
11844 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11848 /* Called when a class type (given by TYPE) is defined. If there are
11849 any existing VAR_DECLs whose type hsa been completed by this
11850 declaration, update them now. */
11853 complete_vars (tree type)
11855 tree *list = &incomplete_vars;
11857 gcc_assert (CLASS_TYPE_P (type));
11860 if (same_type_p (type, TREE_PURPOSE (*list)))
11862 tree var = TREE_VALUE (*list);
11863 tree type = TREE_TYPE (var);
11864 /* Complete the type of the variable. The VAR_DECL itself
11865 will be laid out in expand_expr. */
11866 complete_type (type);
11867 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11868 /* Remove this entry from the list. */
11869 *list = TREE_CHAIN (*list);
11872 list = &TREE_CHAIN (*list);
11875 /* Check for pending declarations which may have abstract type. */
11876 complete_type_check_abstract (type);
11879 /* If DECL is of a type which needs a cleanup, build and return an
11880 expression to perform that cleanup here. Return NULL_TREE if no
11881 cleanup need be done. */
11884 cxx_maybe_build_cleanup (tree decl)
11890 /* Assume no cleanup is required. */
11891 cleanup = NULL_TREE;
11893 if (error_operand_p (decl))
11896 /* Handle "__attribute__((cleanup))". We run the cleanup function
11897 before the destructor since the destructor is what actually
11898 terminates the lifetime of the object. */
11899 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
11906 /* Get the name specified by the user for the cleanup function. */
11907 id = TREE_VALUE (TREE_VALUE (attr));
11908 /* Look up the name to find the cleanup function to call. It is
11909 important to use lookup_name here because that is what is
11910 used in c-common.c:handle_cleanup_attribute when performing
11911 initial checks on the attribute. Note that those checks
11912 include ensuring that the function found is not an overloaded
11913 function, or an object with an overloaded call operator,
11914 etc.; we can rely on the fact that the functionfound is an
11915 ordinary FUNCTION_DECL. */
11916 fn = lookup_name (id);
11917 arg = build_address (decl);
11919 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
11922 /* Handle ordinary C++ destructors. */
11923 type = TREE_TYPE (decl);
11924 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11926 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11927 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11928 && CLASSTYPE_VBASECLASSES (type));
11932 if (TREE_CODE (type) == ARRAY_TYPE)
11936 cxx_mark_addressable (decl);
11937 addr = build_unary_op (ADDR_EXPR, decl, 0);
11940 /* Optimize for space over speed here. */
11941 if (!has_vbases || flag_expensive_optimizations)
11942 flags |= LOOKUP_NONVIRTUAL;
11944 call = build_delete (TREE_TYPE (addr), addr,
11945 sfk_complete_destructor, flags, 0);
11947 cleanup = build_compound_expr (cleanup, call);
11955 /* When a stmt has been parsed, this function is called. */
11962 /* DECL was originally constructed as a non-static member function,
11963 but turned out to be static. Update it accordingly. */
11966 revert_static_member_fn (tree decl)
11969 tree function = TREE_TYPE (decl);
11970 tree args = TYPE_ARG_TYPES (function);
11972 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11973 != TYPE_UNQUALIFIED)
11974 error ("static member function %q#D declared with type qualifiers", decl);
11976 args = TREE_CHAIN (args);
11977 tmp = build_function_type (TREE_TYPE (function), args);
11978 tmp = build_qualified_type (tmp, cp_type_quals (function));
11979 tmp = build_exception_variant (tmp,
11980 TYPE_RAISES_EXCEPTIONS (function));
11981 TREE_TYPE (decl) = tmp;
11982 if (DECL_ARGUMENTS (decl))
11983 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11984 DECL_STATIC_FUNCTION_P (decl) = 1;
11987 /* Initialize the variables used during compilation of a C++
11991 cxx_push_function_context (struct function * f)
11993 struct language_function *p = GGC_CNEW (struct language_function);
11996 /* Whenever we start a new function, we destroy temporaries in the
11998 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12004 if (DECL_SAVED_FUNCTION_DATA (fn))
12006 /* If we already parsed this function, and we're just expanding it
12007 now, restore saved state. */
12008 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
12010 /* We don't need the saved data anymore. Unless this is an inline
12011 function; we need the named return value info for
12012 declare_return_variable. */
12013 if (! DECL_INLINE (fn))
12014 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
12019 /* Free the language-specific parts of F, now that we've finished
12020 compiling the function. */
12023 cxx_pop_function_context (struct function * f)
12028 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12029 one of the language-independent trees. */
12031 enum cp_tree_node_structure_enum
12032 cp_tree_node_structure (union lang_tree_node * t)
12034 switch (TREE_CODE (&t->generic))
12036 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12037 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12038 case OVERLOAD: return TS_CP_OVERLOAD;
12039 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12040 case TINST_LEVEL: return TS_CP_TINST_LEVEL;
12041 case PTRMEM_CST: return TS_CP_PTRMEM;
12042 case BASELINK: return TS_CP_BASELINK;
12043 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12044 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12045 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12046 default: return TS_CP_GENERIC;
12050 /* Build the void_list_node (void_type_node having been created). */
12052 build_void_list_node (void)
12054 tree t = build_tree_list (NULL_TREE, void_type_node);
12059 cp_missing_noreturn_ok_p (tree decl)
12061 /* A missing noreturn is ok for the `main' function. */
12062 return DECL_MAIN_P (decl);
12065 /* Return the COMDAT group into which DECL should be placed. */
12068 cxx_comdat_group (tree decl)
12072 /* Virtual tables, construction virtual tables, and virtual table
12073 tables all go in a single COMDAT group, named after the primary
12075 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12076 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12077 /* For all other DECLs, the COMDAT group is the mangled name of the
12078 declaration itself. */
12081 while (DECL_THUNK_P (decl))
12083 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12084 into the same section as the target function. In that case
12085 we must return target's name. */
12086 tree target = THUNK_TARGET (decl);
12087 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12088 && DECL_SECTION_NAME (target) != NULL
12089 && DECL_ONE_ONLY (target))
12094 name = DECL_ASSEMBLER_NAME (decl);
12097 return IDENTIFIER_POINTER (name);
12100 #include "gt-cp-decl.h"