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 (CONST_CAST (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 && field != error_mark_node
3942 && duplicate_decls (decl, field,
3943 /*newdecl_is_friend=*/false))
3947 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
3948 DECL_IN_AGGR_P (decl) = 0;
3949 /* Do not mark DECL as an explicit specialization if it was not
3950 already marked as an instantiation; a declaration should
3951 never be marked as a specialization unless we know what
3952 template is being specialized. */
3953 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
3955 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
3957 /* [temp.expl.spec] An explicit specialization of a static data
3958 member of a template is a definition if the declaration
3959 includes an initializer; otherwise, it is a declaration.
3961 We check for processing_specialization so this only applies
3962 to the new specialization syntax. */
3963 if (!initialized && processing_specialization)
3964 DECL_EXTERNAL (decl) = 1;
3967 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
3968 pedwarn ("declaration of %q#D outside of class is not definition",
3972 was_public = TREE_PUBLIC (decl);
3974 /* Enter this declaration into the symbol table. */
3975 tem = maybe_push_decl (decl);
3977 if (processing_template_decl)
3978 tem = push_template_decl (tem);
3979 if (tem == error_mark_node)
3980 return error_mark_node;
3982 /* Tell the back end to use or not use .common as appropriate. If we say
3983 -fconserve-space, we want this to save .data space, at the expense of
3984 wrong semantics. If we say -fno-conserve-space, we want this to
3985 produce errors about redefs; to do this we force variables into the
3987 if (flag_conserve_space
3988 && TREE_CODE (tem) == VAR_DECL
3989 && TREE_PUBLIC (tem)
3990 && !DECL_THREAD_LOCAL_P (tem)
3991 && !have_global_bss_p ())
3992 DECL_COMMON (tem) = 1;
3994 if (TREE_CODE (tem) == VAR_DECL
3995 && DECL_NAMESPACE_SCOPE_P (tem) && !TREE_PUBLIC (tem) && !was_public
3996 && !DECL_THIS_STATIC (tem) && !DECL_ARTIFICIAL (tem))
3998 /* This is a const variable with implicit 'static'. Set
3999 DECL_THIS_STATIC so we can tell it from variables that are
4000 !TREE_PUBLIC because of the anonymous namespace. */
4001 gcc_assert (cp_type_readonly (TREE_TYPE (tem)));
4002 DECL_THIS_STATIC (tem) = 1;
4005 if (!processing_template_decl && TREE_CODE (tem) == VAR_DECL)
4006 start_decl_1 (tem, initialized);
4012 start_decl_1 (tree decl, bool initialized)
4016 gcc_assert (!processing_template_decl);
4018 if (error_operand_p (decl))
4021 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4022 type = TREE_TYPE (decl);
4025 /* Is it valid for this decl to have an initializer at all?
4026 If not, set INITIALIZED to zero, which will indirectly
4027 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4029 /* Don't allow initializations for incomplete types except for
4030 arrays which might be completed by the initialization. */
4031 if (COMPLETE_TYPE_P (complete_type (type)))
4032 ; /* A complete type is ok. */
4033 else if (TREE_CODE (type) != ARRAY_TYPE)
4035 error ("variable %q#D has initializer but incomplete type", decl);
4037 type = TREE_TYPE (decl) = error_mark_node;
4039 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4041 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4042 error ("elements of array %q#D have incomplete type", decl);
4043 /* else we already gave an error in start_decl. */
4047 else if (IS_AGGR_TYPE (type)
4048 && ! DECL_EXTERNAL (decl))
4050 if (!COMPLETE_TYPE_P (complete_type (type)))
4052 error ("aggregate %q#D has incomplete type and cannot be defined",
4054 /* Change the type so that assemble_variable will give
4055 DECL an rtl we can live with: (mem (const_int 0)). */
4056 type = TREE_TYPE (decl) = error_mark_node;
4060 /* If any base type in the hierarchy of TYPE needs a constructor,
4061 then we set initialized to 1. This way any nodes which are
4062 created for the purposes of initializing this aggregate
4063 will live as long as it does. This is necessary for global
4064 aggregates which do not have their initializers processed until
4065 the end of the file. */
4066 initialized = TYPE_NEEDS_CONSTRUCTING (type);
4070 /* Create a new scope to hold this declaration if necessary.
4071 Whether or not a new scope is necessary cannot be determined
4072 until after the type has been completed; if the type is a
4073 specialization of a class template it is not until after
4074 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4075 will be set correctly. */
4076 maybe_push_cleanup_level (type);
4079 /* Handle initialization of references. DECL, TYPE, and INIT have the
4080 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4081 but will be set to a new CLEANUP_STMT if a temporary is created
4082 that must be destroyed subsequently.
4084 Returns an initializer expression to use to initialize DECL, or
4085 NULL if the initialization can be performed statically.
4087 Quotes on semantics can be found in ARM 8.4.3. */
4090 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4094 if (init == NULL_TREE)
4096 if ((DECL_LANG_SPECIFIC (decl) == 0
4097 || DECL_IN_AGGR_P (decl) == 0)
4098 && ! DECL_THIS_EXTERN (decl))
4099 error ("%qD declared as reference but not initialized", decl);
4103 if (TREE_CODE (init) == CONSTRUCTOR)
4105 error ("ISO C++ forbids use of initializer list to "
4106 "initialize reference %qD", decl);
4110 if (TREE_CODE (init) == TREE_LIST)
4111 init = build_x_compound_expr_from_list (init, "initializer");
4113 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4114 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4115 /* Note: default conversion is only called in very special cases. */
4116 init = decay_conversion (init);
4118 /* Convert INIT to the reference type TYPE. This may involve the
4119 creation of a temporary, whose lifetime must be the same as that
4120 of the reference. If so, a DECL_EXPR for the temporary will be
4121 added just after the DECL_EXPR for DECL. That's why we don't set
4122 DECL_INITIAL for local references (instead assigning to them
4123 explicitly); we need to allow the temporary to be initialized
4125 tmp = initialize_reference (type, init, decl, cleanup);
4127 if (tmp == error_mark_node)
4129 else if (tmp == NULL_TREE)
4131 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4135 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4138 DECL_INITIAL (decl) = tmp;
4143 /* Designated initializers in arrays are not supported in GNU C++.
4144 The parser cannot detect this error since it does not know whether
4145 a given brace-enclosed initializer is for a class type or for an
4146 array. This function checks that CE does not use a designated
4147 initializer. If it does, an error is issued. Returns true if CE
4148 is valid, i.e., does not have a designated initializer. */
4151 check_array_designated_initializer (const constructor_elt *ce)
4153 /* Designated initializers for array elements are not supported. */
4156 /* The parser only allows identifiers as designated
4158 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4159 error ("name %qD used in a GNU-style designated "
4160 "initializer for an array", ce->index);
4167 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4168 array until we finish parsing the initializer. If that's the
4169 situation we're in, update DECL accordingly. */
4172 maybe_deduce_size_from_array_init (tree decl, tree init)
4174 tree type = TREE_TYPE (decl);
4176 if (TREE_CODE (type) == ARRAY_TYPE
4177 && TYPE_DOMAIN (type) == NULL_TREE
4178 && TREE_CODE (decl) != TYPE_DECL)
4180 /* do_default is really a C-ism to deal with tentative definitions.
4181 But let's leave it here to ease the eventual merge. */
4182 int do_default = !DECL_EXTERNAL (decl);
4183 tree initializer = init ? init : DECL_INITIAL (decl);
4186 /* Check that there are no designated initializers in INIT, as
4187 those are not supported in GNU C++, and as the middle-end
4188 will crash if presented with a non-numeric designated
4190 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4192 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4193 constructor_elt *ce;
4196 VEC_iterate (constructor_elt, v, i, ce);
4198 if (!check_array_designated_initializer (ce))
4204 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4208 error ("initializer fails to determine size of %qD", decl);
4209 TREE_TYPE (decl) = error_mark_node;
4211 else if (failure == 2)
4215 error ("array size missing in %qD", decl);
4216 TREE_TYPE (decl) = error_mark_node;
4218 /* If a `static' var's size isn't known, make it extern as
4219 well as static, so it does not get allocated. If it's not
4220 `static', then don't mark it extern; finish_incomplete_decl
4221 will give it a default size and it will get allocated. */
4222 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4223 DECL_EXTERNAL (decl) = 1;
4225 else if (failure == 3)
4227 error ("zero-size array %qD", decl);
4228 TREE_TYPE (decl) = error_mark_node;
4232 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4234 layout_decl (decl, 0);
4238 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4239 any appropriate error messages regarding the layout. */
4242 layout_var_decl (tree decl)
4246 type = TREE_TYPE (decl);
4247 if (type == error_mark_node)
4250 /* If we haven't already layed out this declaration, do so now.
4251 Note that we must not call complete type for an external object
4252 because it's type might involve templates that we are not
4253 supposed to instantiate yet. (And it's perfectly valid to say
4254 `extern X x' for some incomplete type `X'.) */
4255 if (!DECL_EXTERNAL (decl))
4256 complete_type (type);
4257 if (!DECL_SIZE (decl)
4258 && TREE_TYPE (decl) != error_mark_node
4259 && (COMPLETE_TYPE_P (type)
4260 || (TREE_CODE (type) == ARRAY_TYPE
4261 && !TYPE_DOMAIN (type)
4262 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4263 layout_decl (decl, 0);
4265 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4267 /* An automatic variable with an incomplete type: that is an error.
4268 Don't talk about array types here, since we took care of that
4269 message in grokdeclarator. */
4270 error ("storage size of %qD isn't known", decl);
4271 TREE_TYPE (decl) = error_mark_node;
4274 /* Keep this code around in case we later want to control debug info
4275 based on whether a type is "used". (jason 1999-11-11) */
4277 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4278 /* Let debugger know it should output info for this type. */
4279 note_debug_info_needed (ttype);
4281 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4282 note_debug_info_needed (DECL_CONTEXT (decl));
4285 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4286 && DECL_SIZE (decl) != NULL_TREE
4287 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4289 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4290 constant_expression_warning (DECL_SIZE (decl));
4292 error ("storage size of %qD isn't constant", decl);
4296 /* If a local static variable is declared in an inline function, or if
4297 we have a weak definition, we must endeavor to create only one
4298 instance of the variable at link-time. */
4301 maybe_commonize_var (tree decl)
4303 /* Static data in a function with comdat linkage also has comdat
4305 if (TREE_STATIC (decl)
4306 /* Don't mess with __FUNCTION__. */
4307 && ! DECL_ARTIFICIAL (decl)
4308 && DECL_FUNCTION_SCOPE_P (decl)
4309 /* Unfortunately, import_export_decl has not always been called
4310 before the function is processed, so we cannot simply check
4312 && (DECL_COMDAT (DECL_CONTEXT (decl))
4313 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4314 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4315 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4319 /* With weak symbols, we simply make the variable COMDAT;
4320 that will cause copies in multiple translations units to
4322 comdat_linkage (decl);
4326 if (DECL_INITIAL (decl) == NULL_TREE
4327 || DECL_INITIAL (decl) == error_mark_node)
4329 /* Without weak symbols, we can use COMMON to merge
4330 uninitialized variables. */
4331 TREE_PUBLIC (decl) = 1;
4332 DECL_COMMON (decl) = 1;
4336 /* While for initialized variables, we must use internal
4337 linkage -- which means that multiple copies will not
4339 TREE_PUBLIC (decl) = 0;
4340 DECL_COMMON (decl) = 0;
4341 warning (0, "sorry: semantics of inline function static "
4342 "data %q+#D are wrong (you'll wind up "
4343 "with multiple copies)", decl);
4344 warning (0, "%J you can work around this by removing "
4350 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4351 /* Set it up again; we might have set DECL_INITIAL since the last
4353 comdat_linkage (decl);
4356 /* Issue an error message if DECL is an uninitialized const variable. */
4359 check_for_uninitialized_const_var (tree decl)
4361 tree type = TREE_TYPE (decl);
4363 /* ``Unless explicitly declared extern, a const object does not have
4364 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4366 if (TREE_CODE (decl) == VAR_DECL
4367 && TREE_CODE (type) != REFERENCE_TYPE
4368 && CP_TYPE_CONST_P (type)
4369 && !TYPE_NEEDS_CONSTRUCTING (type)
4370 && !DECL_INITIAL (decl))
4371 error ("uninitialized const %qD", decl);
4375 /* Structure holding the current initializer being processed by reshape_init.
4376 CUR is a pointer to the current element being processed, END is a pointer
4377 after the last element present in the initializer. */
4378 typedef struct reshape_iterator_t
4380 constructor_elt *cur;
4381 constructor_elt *end;
4384 static tree reshape_init_r (tree, reshape_iter *, bool);
4386 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4387 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4388 initialized. If there are no more such fields, the return value
4392 next_initializable_field (tree field)
4395 && (TREE_CODE (field) != FIELD_DECL
4396 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4397 || DECL_ARTIFICIAL (field)))
4398 field = TREE_CHAIN (field);
4403 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4404 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4405 INTEGER_CST representing the size of the array minus one (the maximum index),
4406 or NULL_TREE if the array was declared without specifying the size. D is
4407 the iterator within the constructor. */
4410 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4413 bool sized_array_p = (max_index != NULL_TREE);
4414 unsigned HOST_WIDE_INT max_index_cst = 0;
4415 unsigned HOST_WIDE_INT index;
4417 /* The initializer for an array is always a CONSTRUCTOR. */
4418 new_init = build_constructor (NULL_TREE, NULL);
4422 /* Minus 1 is used for zero sized arrays. */
4423 if (integer_all_onesp (max_index))
4426 if (host_integerp (max_index, 1))
4427 max_index_cst = tree_low_cst (max_index, 1);
4428 /* sizetype is sign extended, not zero extended. */
4430 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4434 /* Loop until there are no more initializers. */
4436 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4441 check_array_designated_initializer (d->cur);
4442 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4443 if (elt_init == error_mark_node)
4444 return error_mark_node;
4445 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4451 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4452 Parameters are the same of reshape_init_r. */
4455 reshape_init_array (tree type, reshape_iter *d)
4457 tree max_index = NULL_TREE;
4459 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4461 if (TYPE_DOMAIN (type))
4462 max_index = array_type_nelts (type);
4464 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4467 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4468 Parameters are the same of reshape_init_r. */
4471 reshape_init_vector (tree type, reshape_iter *d)
4473 tree max_index = NULL_TREE;
4476 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4478 if (COMPOUND_LITERAL_P (d->cur->value))
4480 tree value = d->cur->value;
4481 if (!same_type_p (TREE_TYPE (value), type))
4483 error ("invalid type %qT as initializer for a vector of type %qT",
4484 TREE_TYPE (d->cur->value), type);
4485 value = error_mark_node;
4491 /* For a vector, the representation type is a struct
4492 containing a single member which is an array of the
4493 appropriate size. */
4494 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4495 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4496 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4498 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4501 /* Subroutine of reshape_init_r, processes the initializers for classes
4502 or union. Parameters are the same of reshape_init_r. */
4505 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4510 gcc_assert (CLASS_TYPE_P (type));
4512 /* The initializer for a class is always a CONSTRUCTOR. */
4513 new_init = build_constructor (NULL_TREE, NULL);
4514 field = next_initializable_field (TYPE_FIELDS (type));
4520 An initializer for an aggregate member that is an
4521 empty class shall have the form of an empty
4522 initializer-list {}. */
4523 if (!first_initializer_p)
4525 error ("initializer for %qT must be brace-enclosed", type);
4526 return error_mark_node;
4531 /* Loop through the initializable fields, gathering initializers. */
4532 while (d->cur != d->end)
4536 /* Handle designated initializers, as an extension. */
4539 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4541 if (!field || TREE_CODE (field) != FIELD_DECL)
4543 error ("%qT has no non-static data member named %qD", type,
4545 return error_mark_node;
4549 /* If we processed all the member of the class, we are done. */
4553 field_init = reshape_init_r (TREE_TYPE (field), d,
4554 /*first_initializer_p=*/false);
4555 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4559 When a union is initialized with a brace-enclosed
4560 initializer, the braces shall only contain an
4561 initializer for the first member of the union. */
4562 if (TREE_CODE (type) == UNION_TYPE)
4565 field = next_initializable_field (TREE_CHAIN (field));
4571 /* Subroutine of reshape_init, which processes a single initializer (part of
4572 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4573 iterator within the CONSTRUCTOR which points to the initializer to process.
4574 FIRST_INITIALIZER_P is true if this is the first initializer of the
4575 CONSTRUCTOR node. */
4578 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4580 tree init = d->cur->value;
4582 /* A non-aggregate type is always initialized with a single
4584 if (!CP_AGGREGATE_TYPE_P (type))
4586 /* It is invalid to initialize a non-aggregate type with a
4587 brace-enclosed initializer.
4588 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4589 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4590 a CONSTRUCTOR (with a record type). */
4591 if (TREE_CODE (init) == CONSTRUCTOR
4592 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4594 error ("braces around scalar initializer for type %qT", type);
4595 init = error_mark_node;
4604 All implicit type conversions (clause _conv_) are considered when
4605 initializing the aggregate member with an initializer from an
4606 initializer-list. If the initializer can initialize a member,
4607 the member is initialized. Otherwise, if the member is itself a
4608 non-empty subaggregate, brace elision is assumed and the
4609 initializer is considered for the initialization of the first
4610 member of the subaggregate. */
4611 if (TREE_CODE (init) != CONSTRUCTOR
4612 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4618 /* [dcl.init.string]
4620 A char array (whether plain char, signed char, or unsigned char)
4621 can be initialized by a string-literal (optionally enclosed in
4622 braces); a wchar_t array can be initialized by a wide
4623 string-literal (optionally enclosed in braces). */
4624 if (TREE_CODE (type) == ARRAY_TYPE
4625 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4627 tree str_init = init;
4629 /* Strip one level of braces if and only if they enclose a single
4630 element (as allowed by [dcl.init.string]). */
4631 if (!first_initializer_p
4632 && TREE_CODE (str_init) == CONSTRUCTOR
4633 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4635 str_init = VEC_index (constructor_elt,
4636 CONSTRUCTOR_ELTS (str_init), 0)->value;
4639 /* If it's a string literal, then it's the initializer for the array
4640 as a whole. Otherwise, continue with normal initialization for
4641 array types (one value per array element). */
4642 if (TREE_CODE (str_init) == STRING_CST)
4649 /* The following cases are about aggregates. If we are not within a full
4650 initializer already, and there is not a CONSTRUCTOR, it means that there
4651 is a missing set of braces (that is, we are processing the case for
4652 which reshape_init exists). */
4653 if (!first_initializer_p)
4655 if (TREE_CODE (init) == CONSTRUCTOR)
4657 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4658 /* There is no need to reshape pointer-to-member function
4659 initializers, as they are always constructed correctly
4660 by the front end. */
4662 else if (COMPOUND_LITERAL_P (init))
4663 /* For a nested compound literal, there is no need to reshape since
4664 brace elision is not allowed. Even if we decided to allow it,
4665 we should add a call to reshape_init in finish_compound_literal,
4666 before calling digest_init, so changing this code would still
4667 not be necessary. */
4668 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4672 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4673 return reshape_init (type, init);
4677 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4681 /* Dispatch to specialized routines. */
4682 if (CLASS_TYPE_P (type))
4683 return reshape_init_class (type, d, first_initializer_p);
4684 else if (TREE_CODE (type) == ARRAY_TYPE)
4685 return reshape_init_array (type, d);
4686 else if (TREE_CODE (type) == VECTOR_TYPE)
4687 return reshape_init_vector (type, d);
4692 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4693 brace-enclosed aggregate initializer.
4695 INIT is the CONSTRUCTOR containing the list of initializers describing
4696 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4697 It may not presently match the shape of the TYPE; for example:
4699 struct S { int a; int b; };
4700 struct S a[] = { 1, 2, 3, 4 };
4702 Here INIT will hold a VEC of four elements, rather than a
4703 VEC of two elements, each itself a VEC of two elements. This
4704 routine transforms INIT from the former form into the latter. The
4705 revised CONSTRUCTOR node is returned. */
4708 reshape_init (tree type, tree init)
4710 VEC(constructor_elt, gc) *v;
4714 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4716 v = CONSTRUCTOR_ELTS (init);
4718 /* An empty constructor does not need reshaping, and it is always a valid
4720 if (VEC_empty (constructor_elt, v))
4723 /* Recurse on this CONSTRUCTOR. */
4724 d.cur = VEC_index (constructor_elt, v, 0);
4725 d.end = d.cur + VEC_length (constructor_elt, v);
4727 new_init = reshape_init_r (type, &d, true);
4728 if (new_init == error_mark_node)
4729 return error_mark_node;
4731 /* Make sure all the element of the constructor were used. Otherwise,
4732 issue an error about exceeding initializers. */
4734 error ("too many initializers for %qT", type);
4739 /* Verify INIT (the initializer for DECL), and record the
4740 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4741 grok_reference_init.
4743 If the return value is non-NULL, it is an expression that must be
4744 evaluated dynamically to initialize DECL. */
4747 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4749 tree type = TREE_TYPE (decl);
4750 tree init_code = NULL;
4752 /* Things that are going to be initialized need to have complete
4754 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4756 if (type == error_mark_node)
4757 /* We will have already complained. */
4760 if (TREE_CODE (type) == ARRAY_TYPE)
4762 tree element_type = TREE_TYPE (type);
4764 /* The array type itself need not be complete, because the
4765 initializer may tell us how many elements are in the array.
4766 But, the elements of the array must be complete. */
4767 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4769 error ("elements of array %q#D have incomplete type", decl);
4772 /* It is not valid to initialize a VLA. */
4774 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4775 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4777 error ("variable-sized object %qD may not be initialized", decl);
4781 else if (!COMPLETE_TYPE_P (type))
4783 error ("%qD has incomplete type", decl);
4784 TREE_TYPE (decl) = error_mark_node;
4788 /* There is no way to make a variable-sized class type in GNU C++. */
4789 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4791 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4793 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4794 if (SCALAR_TYPE_P (type))
4798 error ("scalar object %qD requires one element in initializer",
4800 TREE_TYPE (decl) = error_mark_node;
4804 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4806 /* A non-aggregate that is not a scalar cannot be initialized
4807 via an initializer-list in C++98. */
4808 error ("braces around initializer for non-aggregate type %qT",
4810 TREE_TYPE (decl) = error_mark_node;
4815 if (TREE_CODE (decl) == CONST_DECL)
4817 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4819 DECL_INITIAL (decl) = init;
4821 gcc_assert (init != NULL_TREE);
4824 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4825 init = grok_reference_init (decl, type, init, cleanup);
4828 /* Do not reshape constructors of vectors (they don't need to be
4830 if (TREE_CODE (init) == CONSTRUCTOR
4831 && !COMPOUND_LITERAL_P (init)
4832 && !TREE_TYPE (init)) /* ptrmemfunc */
4834 init = reshape_init (type, init);
4836 if ((*targetm.vector_opaque_p) (type))
4838 error ("opaque vector types cannot be initialized");
4839 init = error_mark_node;
4843 /* If DECL has an array type without a specific bound, deduce the
4844 array size from the initializer. */
4845 maybe_deduce_size_from_array_init (decl, init);
4846 type = TREE_TYPE (decl);
4847 if (type == error_mark_node)
4850 if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
4852 if (TREE_CODE (type) == ARRAY_TYPE)
4853 goto initialize_aggr;
4854 else if (TREE_CODE (init) == CONSTRUCTOR)
4856 if (TYPE_NON_AGGREGATE_CLASS (type))
4858 error ("%qD must be initialized by constructor, "
4861 init = error_mark_node;
4864 goto dont_use_constructor;
4868 int saved_stmts_are_full_exprs_p;
4871 saved_stmts_are_full_exprs_p = 0;
4872 if (building_stmt_tree ())
4874 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
4875 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
4877 init = build_aggr_init (decl, init, flags);
4878 if (building_stmt_tree ())
4879 current_stmt_tree ()->stmts_are_full_exprs_p =
4880 saved_stmts_are_full_exprs_p;
4886 dont_use_constructor:
4887 if (TREE_CODE (init) != TREE_VEC)
4889 init_code = store_init_value (decl, init);
4890 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
4891 && DECL_INITIAL (decl)
4892 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
4893 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
4894 warning (0, "array %qD initialized by parenthesized string literal %qE",
4895 decl, DECL_INITIAL (decl));
4900 else if (DECL_EXTERNAL (decl))
4902 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
4903 goto initialize_aggr;
4904 else if (IS_AGGR_TYPE (type))
4906 tree core_type = strip_array_types (type);
4908 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
4909 error ("structure %qD with uninitialized const members", decl);
4910 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
4911 error ("structure %qD with uninitialized reference members", decl);
4913 check_for_uninitialized_const_var (decl);
4916 check_for_uninitialized_const_var (decl);
4918 if (init && init != error_mark_node)
4919 init_code = build2 (INIT_EXPR, type, decl, init);
4924 /* If DECL is not a local variable, give it RTL. */
4927 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
4929 int toplev = toplevel_bindings_p ();
4931 const char *filename;
4933 /* Set the DECL_ASSEMBLER_NAME for the object. */
4936 /* The `register' keyword, when used together with an
4937 asm-specification, indicates that the variable should be
4938 placed in a particular register. */
4939 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
4941 set_user_assembler_name (decl, asmspec);
4942 DECL_HARD_REGISTER (decl) = 1;
4946 if (TREE_CODE (decl) == FUNCTION_DECL
4947 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
4948 set_builtin_user_assembler_name (decl, asmspec);
4949 set_user_assembler_name (decl, asmspec);
4953 /* Handle non-variables up front. */
4954 if (TREE_CODE (decl) != VAR_DECL)
4956 rest_of_decl_compilation (decl, toplev, at_eof);
4960 /* If we see a class member here, it should be a static data
4962 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
4964 gcc_assert (TREE_STATIC (decl));
4965 /* An in-class declaration of a static data member should be
4966 external; it is only a declaration, and not a definition. */
4967 if (init == NULL_TREE)
4968 gcc_assert (DECL_EXTERNAL (decl));
4971 /* We don't create any RTL for local variables. */
4972 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
4975 /* We defer emission of local statics until the corresponding
4976 DECL_EXPR is expanded. */
4977 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
4979 /* We try to defer namespace-scope static constants so that they are
4980 not emitted into the object file unnecessarily. */
4981 filename = input_filename;
4982 if (!DECL_VIRTUAL_P (decl)
4983 && TREE_READONLY (decl)
4984 && DECL_INITIAL (decl) != NULL_TREE
4985 && DECL_INITIAL (decl) != error_mark_node
4987 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
4989 && !TREE_PUBLIC (decl))
4991 /* Fool with the linkage of static consts according to #pragma
4993 struct c_fileinfo *finfo = get_fileinfo (filename);
4994 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
4996 TREE_PUBLIC (decl) = 1;
4997 DECL_EXTERNAL (decl) = finfo->interface_only;
5002 /* Likewise for template instantiations. */
5003 else if (DECL_LANG_SPECIFIC (decl)
5004 && DECL_IMPLICIT_INSTANTIATION (decl))
5007 /* If we're not deferring, go ahead and assemble the variable. */
5009 rest_of_decl_compilation (decl, toplev, at_eof);
5012 /* Generate code to initialize DECL (a local variable). */
5015 initialize_local_var (tree decl, tree init)
5017 tree type = TREE_TYPE (decl);
5020 gcc_assert (TREE_CODE (decl) == VAR_DECL
5021 || TREE_CODE (decl) == RESULT_DECL);
5022 gcc_assert (!TREE_STATIC (decl));
5024 if (DECL_SIZE (decl) == NULL_TREE)
5026 /* If we used it already as memory, it must stay in memory. */
5027 DECL_INITIAL (decl) = NULL_TREE;
5028 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5031 if (DECL_SIZE (decl) && type != error_mark_node)
5035 /* Compute and store the initial value. */
5036 already_used = TREE_USED (decl) || TREE_USED (type);
5038 /* Perform the initialization. */
5041 int saved_stmts_are_full_exprs_p;
5043 gcc_assert (building_stmt_tree ());
5044 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5045 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5046 finish_expr_stmt (init);
5047 current_stmt_tree ()->stmts_are_full_exprs_p =
5048 saved_stmts_are_full_exprs_p;
5051 /* Set this to 0 so we can tell whether an aggregate which was
5052 initialized was ever used. Don't do this if it has a
5053 destructor, so we don't complain about the 'resource
5054 allocation is initialization' idiom. Now set
5055 attribute((unused)) on types so decls of that type will be
5056 marked used. (see TREE_USED, above.) */
5057 if (TYPE_NEEDS_CONSTRUCTING (type)
5059 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5060 && DECL_NAME (decl))
5061 TREE_USED (decl) = 0;
5062 else if (already_used)
5063 TREE_USED (decl) = 1;
5066 /* Generate a cleanup, if necessary. */
5067 cleanup = cxx_maybe_build_cleanup (decl);
5068 if (DECL_SIZE (decl) && cleanup)
5069 finish_decl_cleanup (decl, cleanup);
5072 /* DECL is a VAR_DECL for a compiler-generated variable with static
5073 storage duration (like a virtual table) whose initializer is a
5074 compile-time constant. INIT must be either a TREE_LIST of values,
5075 or a CONSTRUCTOR. Initialize the variable and provide it to the
5079 initialize_artificial_var (tree decl, tree init)
5081 gcc_assert (DECL_ARTIFICIAL (decl));
5082 if (TREE_CODE (init) == TREE_LIST)
5083 init = build_constructor_from_list (NULL_TREE, init);
5084 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5085 DECL_INITIAL (decl) = init;
5086 DECL_INITIALIZED_P (decl) = 1;
5087 determine_visibility (decl);
5088 layout_var_decl (decl);
5089 maybe_commonize_var (decl);
5090 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5093 /* INIT is the initializer for a variable, as represented by the
5094 parser. Returns true iff INIT is value-dependent. */
5097 value_dependent_init_p (tree init)
5099 if (TREE_CODE (init) == TREE_LIST)
5100 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5101 return any_value_dependent_elements_p (init);
5102 else if (TREE_CODE (init) == CONSTRUCTOR)
5103 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5105 VEC(constructor_elt, gc) *elts;
5109 elts = CONSTRUCTOR_ELTS (init);
5110 nelts = VEC_length (constructor_elt, elts);
5111 for (i = 0; i < nelts; ++i)
5112 if (value_dependent_init_p (VEC_index (constructor_elt,
5117 /* It must be a simple expression, e.g., int i = 3; */
5118 return value_dependent_expression_p (init);
5123 /* Finish processing of a declaration;
5124 install its line number and initial value.
5125 If the length of an array type is not known before,
5126 it must be determined now, from the initial value, or it is an error.
5128 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5129 true, then INIT is an integral constant expression.
5131 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5132 if the (init) syntax was used. */
5135 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5136 tree asmspec_tree, int flags)
5140 const char *asmspec = NULL;
5141 int was_readonly = 0;
5142 bool var_definition_p = false;
5143 int saved_processing_template_decl;
5145 if (decl == error_mark_node)
5150 error ("assignment (not initialization) in declaration");
5154 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5155 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5156 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5158 type = TREE_TYPE (decl);
5159 if (type == error_mark_node)
5162 /* Assume no cleanup is required. */
5163 cleanup = NULL_TREE;
5164 saved_processing_template_decl = processing_template_decl;
5166 /* If a name was specified, get the string. */
5167 if (global_scope_p (current_binding_level))
5168 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5169 if (asmspec_tree && asmspec_tree != error_mark_node)
5170 asmspec = TREE_STRING_POINTER (asmspec_tree);
5172 if (current_class_type
5173 && CP_DECL_CONTEXT (decl) == current_class_type
5174 && TYPE_BEING_DEFINED (current_class_type)
5175 && (DECL_INITIAL (decl) || init))
5176 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5178 if (processing_template_decl)
5180 bool type_dependent_p;
5182 /* Add this declaration to the statement-tree. */
5183 if (at_function_scope_p ())
5184 add_decl_expr (decl);
5186 type_dependent_p = dependent_type_p (type);
5188 if (init && init_const_expr_p)
5190 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5191 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5192 TREE_CONSTANT (decl) = 1;
5195 /* Generally, initializers in templates are expanded when the
5196 template is instantiated. But, if DECL is an integral
5197 constant static data member, then it can be used in future
5198 integral constant expressions, and its value must be
5201 && DECL_CLASS_SCOPE_P (decl)
5202 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5203 && !type_dependent_p
5204 && !value_dependent_init_p (init)))
5207 DECL_INITIAL (decl) = init;
5208 if (TREE_CODE (decl) == VAR_DECL
5209 && !DECL_PRETTY_FUNCTION_P (decl)
5210 && !type_dependent_p)
5211 maybe_deduce_size_from_array_init (decl, init);
5215 init = fold_non_dependent_expr (init);
5216 processing_template_decl = 0;
5219 /* Take care of TYPE_DECLs up front. */
5220 if (TREE_CODE (decl) == TYPE_DECL)
5222 if (type != error_mark_node
5223 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5225 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5226 warning (0, "shadowing previous type declaration of %q#D", decl);
5227 set_identifier_type_value (DECL_NAME (decl), decl);
5230 /* If we have installed this as the canonical typedef for this
5231 type, and that type has not been defined yet, delay emitting
5232 the debug information for it, as we will emit it later. */
5233 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5234 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5235 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5237 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5242 /* A reference will be modified here, as it is initialized. */
5243 if (! DECL_EXTERNAL (decl)
5244 && TREE_READONLY (decl)
5245 && TREE_CODE (type) == REFERENCE_TYPE)
5248 TREE_READONLY (decl) = 0;
5251 if (TREE_CODE (decl) == VAR_DECL)
5253 /* Only PODs can have thread-local storage. Other types may require
5254 various kinds of non-trivial initialization. */
5255 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5256 error ("%qD cannot be thread-local because it has non-POD type %qT",
5257 decl, TREE_TYPE (decl));
5258 /* If this is a local variable that will need a mangled name,
5259 register it now. We must do this before processing the
5260 initializer for the variable, since the initialization might
5261 require a guard variable, and since the mangled name of the
5262 guard variable will depend on the mangled name of this
5264 if (!processing_template_decl
5265 && DECL_FUNCTION_SCOPE_P (decl)
5266 && TREE_STATIC (decl)
5267 && !DECL_ARTIFICIAL (decl))
5268 push_local_name (decl);
5269 /* Convert the initializer to the type of DECL, if we have not
5270 already initialized DECL. */
5271 if (!DECL_INITIALIZED_P (decl)
5272 /* If !DECL_EXTERNAL then DECL is being defined. In the
5273 case of a static data member initialized inside the
5274 class-specifier, there can be an initializer even if DECL
5275 is *not* defined. */
5276 && (!DECL_EXTERNAL (decl) || init))
5280 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5281 if (init_const_expr_p)
5283 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5284 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5285 TREE_CONSTANT (decl) = 1;
5288 init = check_initializer (decl, init, flags, &cleanup);
5289 /* Thread-local storage cannot be dynamically initialized. */
5290 if (DECL_THREAD_LOCAL_P (decl) && init)
5292 error ("%qD is thread-local and so cannot be dynamically "
5293 "initialized", decl);
5297 /* Check that the initializer for a static data member was a
5298 constant. Although we check in the parser that the
5299 initializer is an integral constant expression, we do not
5300 simplify division-by-zero at the point at which it
5301 occurs. Therefore, in:
5303 struct S { static const int i = 7 / 0; };
5305 we issue an error at this point. It would
5306 probably be better to forbid division by zero in
5307 integral constant expressions. */
5308 if (DECL_EXTERNAL (decl) && init)
5310 error ("%qD cannot be initialized by a non-constant expression"
5311 " when being declared", decl);
5312 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5320 The memory occupied by any object of static storage
5321 duration is zero-initialized at program startup before
5322 any other initialization takes place.
5324 We cannot create an appropriate initializer until after
5325 the type of DECL is finalized. If DECL_INITIAL is set,
5326 then the DECL is statically initialized, and any
5327 necessary zero-initialization has already been performed. */
5328 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5329 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5330 /*nelts=*/NULL_TREE,
5331 /*static_storage_p=*/true);
5332 /* Remember that the initialization for this variable has
5334 DECL_INITIALIZED_P (decl) = 1;
5335 /* This declaration is the definition of this variable,
5336 unless we are initializing a static data member within
5337 the class specifier. */
5338 if (!DECL_EXTERNAL (decl))
5339 var_definition_p = true;
5341 /* If the variable has an array type, lay out the type, even if
5342 there is no initializer. It is valid to index through the
5343 array, and we must get TYPE_ALIGN set correctly on the array
5345 else if (TREE_CODE (type) == ARRAY_TYPE)
5349 /* Add this declaration to the statement-tree. This needs to happen
5350 after the call to check_initializer so that the DECL_EXPR for a
5351 reference temp is added before the DECL_EXPR for the reference itself. */
5352 if (at_function_scope_p ())
5353 add_decl_expr (decl);
5355 /* Let the middle end know about variables and functions -- but not
5356 static data members in uninstantiated class templates. */
5357 if (!saved_processing_template_decl
5358 && (TREE_CODE (decl) == VAR_DECL
5359 || TREE_CODE (decl) == FUNCTION_DECL))
5361 if (TREE_CODE (decl) == VAR_DECL)
5363 layout_var_decl (decl);
5364 maybe_commonize_var (decl);
5367 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5369 /* Check for abstractness of the type. Notice that there is no
5370 need to strip array types here since the check for those types
5371 is already done within create_array_type_for_decl. */
5372 if (TREE_CODE (type) == FUNCTION_TYPE
5373 || TREE_CODE (type) == METHOD_TYPE)
5374 abstract_virtuals_error (decl, TREE_TYPE (type));
5376 abstract_virtuals_error (decl, type);
5378 /* This needs to happen after the linkage is set. */
5379 determine_visibility (decl);
5381 if (TREE_CODE (decl) == FUNCTION_DECL
5382 || TREE_TYPE (decl) == error_mark_node)
5383 /* No initialization required. */
5385 else if (DECL_EXTERNAL (decl)
5386 && ! (DECL_LANG_SPECIFIC (decl)
5387 && DECL_NOT_REALLY_EXTERN (decl)))
5390 DECL_INITIAL (decl) = init;
5394 /* A variable definition. */
5395 if (DECL_FUNCTION_SCOPE_P (decl))
5397 /* Initialize the local variable. */
5398 if (processing_template_decl)
5399 DECL_INITIAL (decl) = init;
5400 else if (!TREE_STATIC (decl))
5401 initialize_local_var (decl, init);
5404 /* If a variable is defined, and then a subsequent
5405 definition with external linkage is encountered, we will
5406 get here twice for the same variable. We want to avoid
5407 calling expand_static_init more than once. For variables
5408 that are not static data members, we can call
5409 expand_static_init only when we actually process the
5410 initializer. It is not legal to redeclare a static data
5411 member, so this issue does not arise in that case. */
5412 if (var_definition_p && TREE_STATIC (decl))
5414 /* If a TREE_READONLY variable needs initialization
5415 at runtime, it is no longer readonly and we need to
5416 avoid MEM_READONLY_P being set on RTL created for it. */
5419 if (TREE_READONLY (decl))
5420 TREE_READONLY (decl) = 0;
5423 expand_static_init (decl, init);
5428 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5429 reference, insert it in the statement-tree now. */
5431 push_cleanup (decl, cleanup, false);
5434 processing_template_decl = saved_processing_template_decl;
5437 TREE_READONLY (decl) = 1;
5439 /* If this was marked 'used', be sure it will be output. */
5440 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5441 mark_decl_referenced (decl);
5444 /* This is here for a midend callback from c-common.c. */
5447 finish_decl (tree decl, tree init, tree asmspec_tree)
5449 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5452 /* Returns a declaration for a VAR_DECL as if:
5454 extern "C" TYPE NAME;
5456 had been seen. Used to create compiler-generated global
5460 declare_global_var (tree name, tree type)
5464 push_to_top_level ();
5465 decl = build_decl (VAR_DECL, name, type);
5466 TREE_PUBLIC (decl) = 1;
5467 DECL_EXTERNAL (decl) = 1;
5468 DECL_ARTIFICIAL (decl) = 1;
5469 /* If the user has explicitly declared this variable (perhaps
5470 because the code we are compiling is part of a low-level runtime
5471 library), then it is possible that our declaration will be merged
5472 with theirs by pushdecl. */
5473 decl = pushdecl (decl);
5474 finish_decl (decl, NULL_TREE, NULL_TREE);
5475 pop_from_top_level ();
5480 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5481 if "__cxa_atexit" is not being used) corresponding to the function
5482 to be called when the program exits. */
5485 get_atexit_fn_ptr_type (void)
5490 if (!atexit_fn_ptr_type_node)
5492 if (flag_use_cxa_atexit
5493 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5494 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5495 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5497 /* The parameter to "atexit" is "void (*)(void)". */
5498 arg_types = void_list_node;
5500 fn_type = build_function_type (void_type_node, arg_types);
5501 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5504 return atexit_fn_ptr_type_node;
5507 /* Returns a pointer to the `atexit' function. Note that if
5508 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5509 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5512 get_atexit_node (void)
5519 bool use_aeabi_atexit;
5524 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5526 /* The declaration for `__cxa_atexit' is:
5528 int __cxa_atexit (void (*)(void *), void *, void *)
5530 We build up the argument types and then then function type
5533 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5534 /* First, build the pointer-to-function type for the first
5536 fn_ptr_type = get_atexit_fn_ptr_type ();
5537 /* Then, build the rest of the argument types. */
5538 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5539 if (use_aeabi_atexit)
5541 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5542 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5546 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5547 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5549 /* And the final __cxa_atexit type. */
5550 fn_type = build_function_type (integer_type_node, arg_types);
5551 fn_ptr_type = build_pointer_type (fn_type);
5552 if (use_aeabi_atexit)
5553 name = "__aeabi_atexit";
5555 name = "__cxa_atexit";
5559 /* The declaration for `atexit' is:
5561 int atexit (void (*)());
5563 We build up the argument types and then then function type
5565 fn_ptr_type = get_atexit_fn_ptr_type ();
5566 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5567 /* Build the final atexit type. */
5568 fn_type = build_function_type (integer_type_node, arg_types);
5572 /* Now, build the function declaration. */
5573 push_lang_context (lang_name_c);
5574 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5575 mark_used (atexit_fndecl);
5576 pop_lang_context ();
5577 atexit_node = decay_conversion (atexit_fndecl);
5582 /* Returns the __dso_handle VAR_DECL. */
5585 get_dso_handle_node (void)
5587 if (dso_handle_node)
5588 return dso_handle_node;
5590 /* Declare the variable. */
5591 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5594 return dso_handle_node;
5597 /* Begin a new function with internal linkage whose job will be simply
5598 to destroy some particular variable. */
5600 static GTY(()) int start_cleanup_cnt;
5603 start_cleanup_fn (void)
5608 bool use_cxa_atexit = flag_use_cxa_atexit
5609 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5611 push_to_top_level ();
5613 /* No need to mangle this. */
5614 push_lang_context (lang_name_c);
5616 /* Build the name of the function. */
5617 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5618 /* Build the function declaration. */
5619 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5620 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5621 /* It's a function with internal linkage, generated by the
5623 TREE_PUBLIC (fndecl) = 0;
5624 DECL_ARTIFICIAL (fndecl) = 1;
5625 /* Make the function `inline' so that it is only emitted if it is
5626 actually needed. It is unlikely that it will be inlined, since
5627 it is only called via a function pointer, but we avoid unnecessary
5628 emissions this way. */
5629 DECL_INLINE (fndecl) = 1;
5630 DECL_DECLARED_INLINE_P (fndecl) = 1;
5631 DECL_INTERFACE_KNOWN (fndecl) = 1;
5632 /* Build the parameter. */
5637 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5638 DECL_CONTEXT (parmdecl) = fndecl;
5639 TREE_USED (parmdecl) = 1;
5640 DECL_ARGUMENTS (fndecl) = parmdecl;
5644 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5646 pop_lang_context ();
5648 return current_function_decl;
5651 /* Finish the cleanup function begun by start_cleanup_fn. */
5654 end_cleanup_fn (void)
5656 expand_or_defer_fn (finish_function (0));
5658 pop_from_top_level ();
5661 /* Generate code to handle the destruction of DECL, an object with
5662 static storage duration. */
5665 register_dtor_fn (tree decl)
5674 type = TREE_TYPE (decl);
5675 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5676 return void_zero_node;
5678 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5679 a class object, we can just pass the destructor to
5680 "__cxa_atexit"; we don't have to build a temporary function to do
5682 use_dtor = (flag_use_cxa_atexit
5683 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5684 && CLASS_TYPE_P (type));
5689 /* Find the destructor. */
5690 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5691 gcc_assert (idx >= 0);
5692 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5693 /* Make sure it is accessible. */
5694 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5698 /* Call build_cleanup before we enter the anonymous function so
5699 that any access checks will be done relative to the current
5700 scope, rather than the scope of the anonymous function. */
5701 build_cleanup (decl);
5703 /* Now start the function. */
5704 cleanup = start_cleanup_fn ();
5706 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5707 to the original function, rather than the anonymous one. That
5708 will make the back end think that nested functions are in use,
5709 which causes confusion. */
5710 push_deferring_access_checks (dk_no_check);
5711 fcall = build_cleanup (decl);
5712 pop_deferring_access_checks ();
5714 /* Create the body of the anonymous function. */
5715 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5716 finish_expr_stmt (fcall);
5717 finish_compound_stmt (compound_stmt);
5721 /* Call atexit with the cleanup function. */
5722 mark_used (cleanup);
5723 cleanup = build_address (cleanup);
5724 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5730 /* We must convert CLEANUP to the type that "__cxa_atexit"
5732 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5733 /* "__cxa_atexit" will pass the address of DECL to the
5734 cleanup function. */
5736 addr = build_address (decl);
5737 /* The declared type of the parameter to "__cxa_atexit" is
5738 "void *". For plain "T*", we could just let the
5739 machinery in build_function_call convert it -- but if the
5740 type is "cv-qualified T *", then we need to convert it
5741 before passing it in, to avoid spurious errors. */
5742 addr = build_nop (ptr_type_node, addr);
5745 /* Since the cleanup functions we build ignore the address
5746 they're given, there's no reason to pass the actual address
5747 in, and, in general, it's cheaper to pass NULL than any
5749 addr = null_pointer_node;
5750 args = tree_cons (NULL_TREE,
5751 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
5753 if (targetm.cxx.use_aeabi_atexit ())
5755 args = tree_cons (NULL_TREE, cleanup, args);
5756 args = tree_cons (NULL_TREE, addr, args);
5760 args = tree_cons (NULL_TREE, addr, args);
5761 args = tree_cons (NULL_TREE, cleanup, args);
5765 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
5766 return build_function_call (get_atexit_node (), args);
5769 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
5770 is its initializer. Generate code to handle the construction
5771 and destruction of DECL. */
5774 expand_static_init (tree decl, tree init)
5776 gcc_assert (TREE_CODE (decl) == VAR_DECL);
5777 gcc_assert (TREE_STATIC (decl));
5779 /* Some variables require no initialization. */
5781 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
5782 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
5785 if (DECL_FUNCTION_SCOPE_P (decl))
5787 /* Emit code to perform this initialization but once. */
5788 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
5789 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
5790 tree guard, guard_addr;
5791 tree acquire_fn, release_fn, abort_fn;
5794 /* Emit code to perform this initialization but once. This code
5797 static <type> guard;
5798 if (!guard.first_byte) {
5799 if (__cxa_guard_acquire (&guard)) {
5802 // Do initialization.
5803 flag = true; __cxa_guard_release (&guard);
5804 // Register variable for destruction at end of program.
5806 if (!flag) __cxa_guard_abort (&guard);
5810 Note that the `flag' variable is only set to 1 *after* the
5811 initialization is complete. This ensures that an exception,
5812 thrown during the construction, will cause the variable to
5813 reinitialized when we pass through this code again, as per:
5817 If the initialization exits by throwing an exception, the
5818 initialization is not complete, so it will be tried again
5819 the next time control enters the declaration.
5821 This process should be thread-safe, too; multiple threads
5822 should not be able to initialize the variable more than
5825 /* Create the guard variable. */
5826 guard = get_guard (decl);
5828 /* This optimization isn't safe on targets with relaxed memory
5829 consistency. On such targets we force synchronization in
5830 __cxa_guard_acquire. */
5831 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5833 /* Begin the conditional initialization. */
5834 if_stmt = begin_if_stmt ();
5835 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
5836 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5839 if (flag_threadsafe_statics)
5841 guard_addr = build_address (guard);
5843 acquire_fn = get_identifier ("__cxa_guard_acquire");
5844 release_fn = get_identifier ("__cxa_guard_release");
5845 abort_fn = get_identifier ("__cxa_guard_abort");
5846 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
5848 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
5850 tree vfntype = build_function_type (void_type_node, argtypes);
5851 acquire_fn = push_library_fn
5852 (acquire_fn, build_function_type (integer_type_node, argtypes));
5853 release_fn = push_library_fn (release_fn, vfntype);
5854 abort_fn = push_library_fn (abort_fn, vfntype);
5858 release_fn = identifier_global_value (release_fn);
5859 abort_fn = identifier_global_value (abort_fn);
5862 inner_if_stmt = begin_if_stmt ();
5863 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
5866 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
5867 begin = get_target_expr (boolean_false_node);
5868 flag = TARGET_EXPR_SLOT (begin);
5870 TARGET_EXPR_CLEANUP (begin)
5871 = build3 (COND_EXPR, void_type_node, flag,
5873 build_call_n (abort_fn, 1, guard_addr));
5874 CLEANUP_EH_ONLY (begin) = 1;
5876 /* Do the initialization itself. */
5877 init = add_stmt_to_compound (begin, init);
5878 init = add_stmt_to_compound
5879 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
5880 init = add_stmt_to_compound
5881 (init, build_call_n (release_fn, 1, guard_addr));
5884 init = add_stmt_to_compound (init, set_guard (guard));
5886 /* Use atexit to register a function for destroying this static
5888 init = add_stmt_to_compound (init, register_dtor_fn (decl));
5890 finish_expr_stmt (init);
5892 if (flag_threadsafe_statics)
5894 finish_compound_stmt (inner_then_clause);
5895 finish_then_clause (inner_if_stmt);
5896 finish_if_stmt (inner_if_stmt);
5899 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
5901 finish_compound_stmt (then_clause);
5902 finish_then_clause (if_stmt);
5903 finish_if_stmt (if_stmt);
5907 static_aggregates = tree_cons (init, decl, static_aggregates);
5911 /* Make TYPE a complete type based on INITIAL_VALUE.
5912 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
5913 2 if there was no information (in which case assume 0 if DO_DEFAULT),
5914 3 if the initializer list is empty (in pedantic mode). */
5917 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
5920 tree type, elt_type;
5924 /* An array of character type can be initialized from a
5925 brace-enclosed string constant.
5927 FIXME: this code is duplicated from reshape_init. Probably
5928 we should just call reshape_init here? */
5929 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
5930 && TREE_CODE (initial_value) == CONSTRUCTOR
5931 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
5933 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
5934 tree value = VEC_index (constructor_elt, v, 0)->value;
5936 if (TREE_CODE (value) == STRING_CST
5937 && VEC_length (constructor_elt, v) == 1)
5938 initial_value = value;
5942 failure = complete_array_type (ptype, initial_value, do_default);
5944 /* We can create the array before the element type is complete, which
5945 means that we didn't have these two bits set in the original type
5946 either. In completing the type, we are expected to propagate these
5947 bits. See also complete_type which does the same thing for arrays
5950 if (TYPE_DOMAIN (type))
5952 elt_type = TREE_TYPE (type);
5953 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
5954 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
5955 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
5961 /* Return zero if something is declared to be a member of type
5962 CTYPE when in the context of CUR_TYPE. STRING is the error
5963 message to print in that case. Otherwise, quietly return 1. */
5966 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
5968 if (ctype && ctype != cur_type)
5970 if (flags == DTOR_FLAG)
5971 error ("destructor for alien class %qT cannot be a member", ctype);
5973 error ("constructor for alien class %qT cannot be a member", ctype);
5979 /* Subroutine of `grokdeclarator'. */
5981 /* Generate errors possibly applicable for a given set of specifiers.
5982 This is for ARM $7.1.2. */
5985 bad_specifiers (tree object,
5994 error ("%qD declared as a %<virtual%> %s", object, type);
5996 error ("%qD declared as an %<inline%> %s", object, type);
5998 error ("%<const%> and %<volatile%> function specifiers on "
5999 "%qD invalid in %s declaration",
6002 error ("%q+D declared as a friend", object);
6004 && (TREE_CODE (object) == TYPE_DECL
6005 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6006 && !TYPE_REFFN_P (TREE_TYPE (object))
6007 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6008 error ("%q+D declared with an exception specification", object);
6011 /* DECL is a member function or static data member and is presently
6012 being defined. Check that the definition is taking place in a
6016 check_class_member_definition_namespace (tree decl)
6018 /* These checks only apply to member functions and static data
6020 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6021 || TREE_CODE (decl) == VAR_DECL);
6022 /* We check for problems with specializations in pt.c in
6023 check_specialization_namespace, where we can issue better
6025 if (processing_specialization)
6027 /* There are no restrictions on the placement of
6028 explicit instantiations. */
6029 if (processing_explicit_instantiation)
6033 A member function definition that appears outside of the
6034 class definition shall appear in a namespace scope enclosing
6035 the class definition.
6039 The definition for a static data member shall appear in a
6040 namespace scope enclosing the member's class definition. */
6041 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6042 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6043 decl, DECL_CONTEXT (decl));
6046 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6047 METHOD_TYPE for a non-static member function; QUALS are the
6048 cv-qualifiers that apply to the function. */
6051 build_this_parm (tree type, cp_cv_quals quals)
6056 cp_cv_quals this_quals;
6058 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6059 /* The `this' parameter is implicitly `const'; it cannot be
6061 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6062 qual_type = cp_build_qualified_type (this_type, this_quals);
6063 parm = build_artificial_parm (this_identifier, qual_type);
6064 cp_apply_type_quals_to_decl (this_quals, parm);
6068 /* CTYPE is class type, or null if non-class.
6069 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6071 DECLARATOR is the function's name.
6072 PARMS is a chain of PARM_DECLs for the function.
6073 VIRTUALP is truthvalue of whether the function is virtual or not.
6074 FLAGS are to be passed through to `grokclassfn'.
6075 QUALS are qualifiers indicating whether the function is `const'
6077 RAISES is a list of exceptions that this function can raise.
6078 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6079 not look, and -1 if we should not call `grokclassfn' at all.
6081 SFK is the kind of special function (if any) for the new function.
6083 Returns `NULL_TREE' if something goes wrong, after issuing
6084 applicable error messages. */
6087 grokfndecl (tree ctype,
6091 tree orig_declarator,
6093 enum overload_flags flags,
6100 special_function_kind sfk,
6107 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6111 type = build_exception_variant (type, raises);
6113 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6114 if (TREE_CODE (type) == METHOD_TYPE)
6117 parm = build_this_parm (type, quals);
6118 TREE_CHAIN (parm) = parms;
6121 DECL_ARGUMENTS (decl) = parms;
6122 /* Propagate volatile out from type to decl. */
6123 if (TYPE_VOLATILE (type))
6124 TREE_THIS_VOLATILE (decl) = 1;
6126 /* Setup decl according to sfk. */
6129 case sfk_constructor:
6130 case sfk_copy_constructor:
6131 DECL_CONSTRUCTOR_P (decl) = 1;
6133 case sfk_destructor:
6134 DECL_DESTRUCTOR_P (decl) = 1;
6140 /* If pointers to member functions use the least significant bit to
6141 indicate whether a function is virtual, ensure a pointer
6142 to this function will have that bit clear. */
6143 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6144 && TREE_CODE (type) == METHOD_TYPE
6145 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6146 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6149 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6153 ("defining explicit specialization %qD in friend declaration",
6157 tree fns = TREE_OPERAND (orig_declarator, 0);
6158 tree args = TREE_OPERAND (orig_declarator, 1);
6160 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6162 /* Something like `template <class T> friend void f<T>()'. */
6163 error ("invalid use of template-id %qD in declaration "
6164 "of primary template",
6170 /* A friend declaration of the form friend void f<>(). Record
6171 the information in the TEMPLATE_ID_EXPR. */
6172 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6174 if (TREE_CODE (fns) == COMPONENT_REF)
6176 /* Due to bison parser ickiness, we will have already looked
6177 up an operator_name or PFUNCNAME within the current class
6178 (see template_id in parse.y). If the current class contains
6179 such a name, we'll get a COMPONENT_REF here. Undo that. */
6181 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6182 == current_class_type);
6183 fns = TREE_OPERAND (fns, 1);
6185 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6186 || TREE_CODE (fns) == OVERLOAD);
6187 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6189 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6190 if (TREE_PURPOSE (t)
6191 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6193 error ("default arguments are not allowed in declaration "
6194 "of friend template specialization %qD",
6201 error ("%<inline%> is not allowed in declaration of friend "
6202 "template specialization %qD",
6209 /* If this decl has namespace scope, set that up. */
6211 set_decl_namespace (decl, in_namespace, friendp);
6213 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6215 /* `main' and builtins have implicit 'C' linkage. */
6216 if ((MAIN_NAME_P (declarator)
6217 || (IDENTIFIER_LENGTH (declarator) > 10
6218 && IDENTIFIER_POINTER (declarator)[0] == '_'
6219 && IDENTIFIER_POINTER (declarator)[1] == '_'
6220 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6221 && current_lang_name == lang_name_cplusplus
6222 && ctype == NULL_TREE
6223 /* NULL_TREE means global namespace. */
6224 && DECL_CONTEXT (decl) == NULL_TREE)
6225 SET_DECL_LANGUAGE (decl, lang_c);
6227 /* Should probably propagate const out from type to decl I bet (mrs). */
6230 DECL_STATIC_FUNCTION_P (decl) = 1;
6231 DECL_CONTEXT (decl) = ctype;
6236 DECL_CONTEXT (decl) = ctype;
6238 check_class_member_definition_namespace (decl);
6241 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6243 if (processing_template_decl)
6244 error ("cannot declare %<::main%> to be a template");
6246 error ("cannot declare %<::main%> to be inline");
6248 error ("cannot declare %<::main%> to be static");
6253 /* Members of anonymous types and local classes have no linkage; make
6254 them internal. If a typedef is made later, this will be changed. */
6255 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6256 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6261 /* [basic.link]: A name with no linkage (notably, the name of a class
6262 or enumeration declared in a local scope) shall not be used to
6263 declare an entity with linkage.
6265 Only check this for public decls for now. See core 319, 389. */
6266 t = no_linkage_check (TREE_TYPE (decl),
6267 /*relaxed_p=*/false);
6270 if (TYPE_ANONYMOUS_P (t))
6272 if (DECL_EXTERN_C_P (decl))
6273 /* Allow this; it's pretty common in C. */;
6276 pedwarn ("non-local function %q#D uses anonymous type",
6278 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6279 pedwarn ("%q+#D does not refer to the unqualified "
6280 "type, so it is not used for linkage",
6285 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6289 TREE_PUBLIC (decl) = publicp;
6292 DECL_INTERFACE_KNOWN (decl) = 1;
6293 DECL_NOT_REALLY_EXTERN (decl) = 1;
6296 /* If the declaration was declared inline, mark it as such. */
6298 DECL_DECLARED_INLINE_P (decl) = 1;
6299 /* We inline functions that are explicitly declared inline, or, when
6300 the user explicitly asks us to, all functions. */
6301 if (DECL_DECLARED_INLINE_P (decl)
6302 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6303 DECL_INLINE (decl) = 1;
6305 DECL_EXTERNAL (decl) = 1;
6306 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6309 ? G_("static member function %qD cannot have cv-qualifier")
6310 : G_("non-member function %qD cannot have cv-qualifier"),
6312 quals = TYPE_UNQUALIFIED;
6315 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6316 && !grok_op_properties (decl, /*complain=*/true))
6319 if (ctype && decl_function_context (decl))
6320 DECL_NO_STATIC_CHAIN (decl) = 1;
6323 /* Make the init_value nonzero so pushdecl knows this is not
6324 tentative. error_mark_node is replaced later with the BLOCK. */
6325 DECL_INITIAL (decl) = error_mark_node;
6327 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6328 TREE_NOTHROW (decl) = 1;
6330 /* Caller will do the rest of this. */
6334 if (ctype != NULL_TREE)
6335 grokclassfn (ctype, decl, flags);
6337 decl = check_explicit_specialization (orig_declarator, decl,
6340 4 * (friendp != 0));
6341 if (decl == error_mark_node)
6346 cplus_decl_attributes (&decl, *attrlist, 0);
6347 *attrlist = NULL_TREE;
6350 /* Check main's type after attributes have been applied. */
6351 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6353 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6356 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6358 error ("%<::main%> must return %<int%>");
6359 newtype = build_function_type (integer_type_node, oldtypeargs);
6360 TREE_TYPE (decl) = newtype;
6362 check_main_parameter_types (decl);
6365 if (ctype != NULL_TREE
6366 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6369 tree old_decl = check_classfn (ctype, decl,
6370 (processing_template_decl
6371 > template_class_depth (ctype))
6372 ? current_template_parms
6375 if (old_decl == error_mark_node)
6383 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6384 /* Because grokfndecl is always supposed to return a
6385 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6386 here. We depend on our callers to figure out that its
6387 really a template that's being returned. */
6388 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6390 if (DECL_STATIC_FUNCTION_P (old_decl)
6391 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6392 /* Remove the `this' parm added by grokclassfn.
6393 XXX Isn't this done in start_function, too? */
6394 revert_static_member_fn (decl);
6395 if (DECL_ARTIFICIAL (old_decl))
6396 error ("definition of implicitly-declared %qD", old_decl);
6398 /* Since we've smashed OLD_DECL to its
6399 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6400 if (TREE_CODE (decl) == TEMPLATE_DECL)
6401 decl = DECL_TEMPLATE_RESULT (decl);
6403 /* Attempt to merge the declarations. This can fail, in
6404 the case of some invalid specialization declarations. */
6405 pushed_scope = push_scope (ctype);
6406 ok = duplicate_decls (decl, old_decl, friendp);
6408 pop_scope (pushed_scope);
6411 error ("no %q#D member function declared in class %qT",
6419 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6422 if (ctype == NULL_TREE || check)
6426 DECL_VIRTUAL_P (decl) = 1;
6431 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6432 the linkage that DECL will receive in the object file. */
6435 set_linkage_for_static_data_member (tree decl)
6437 /* A static data member always has static storage duration and
6438 external linkage. Note that static data members are forbidden in
6439 local classes -- the only situation in which a class has
6440 non-external linkage. */
6441 TREE_PUBLIC (decl) = 1;
6442 TREE_STATIC (decl) = 1;
6443 /* For non-template classes, static data members are always put
6444 out in exactly those files where they are defined, just as
6445 with ordinary namespace-scope variables. */
6446 if (!processing_template_decl)
6447 DECL_INTERFACE_KNOWN (decl) = 1;
6450 /* Create a VAR_DECL named NAME with the indicated TYPE.
6452 If SCOPE is non-NULL, it is the class type or namespace containing
6453 the variable. If SCOPE is NULL, the variable should is created in
6454 the innermost enclosings scope. */
6457 grokvardecl (tree type,
6459 const cp_decl_specifier_seq *declspecs,
6465 tree explicit_scope;
6467 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6469 /* Compute the scope in which to place the variable, but remember
6470 whether or not that scope was explicitly specified by the user. */
6471 explicit_scope = scope;
6474 /* An explicit "extern" specifier indicates a namespace-scope
6476 if (declspecs->storage_class == sc_extern)
6477 scope = current_namespace;
6478 else if (!at_function_scope_p ())
6479 scope = current_scope ();
6483 && (/* If the variable is a namespace-scope variable declared in a
6484 template, we need DECL_LANG_SPECIFIC. */
6485 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6486 /* Similarly for namespace-scope variables with language linkage
6488 || (TREE_CODE (scope) == NAMESPACE_DECL
6489 && current_lang_name != lang_name_cplusplus)
6490 /* Similarly for static data members. */
6492 decl = build_lang_decl (VAR_DECL, name, type);
6494 decl = build_decl (VAR_DECL, name, type);
6496 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6497 set_decl_namespace (decl, explicit_scope, 0);
6499 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6501 if (declspecs->storage_class == sc_extern)
6503 DECL_THIS_EXTERN (decl) = 1;
6504 DECL_EXTERNAL (decl) = !initialized;
6507 if (DECL_CLASS_SCOPE_P (decl))
6509 set_linkage_for_static_data_member (decl);
6510 /* This function is only called with out-of-class definitions. */
6511 DECL_EXTERNAL (decl) = 0;
6512 check_class_member_definition_namespace (decl);
6514 /* At top level, either `static' or no s.c. makes a definition
6515 (perhaps tentative), and absence of `static' makes it public. */
6516 else if (toplevel_bindings_p ())
6518 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6519 && (DECL_THIS_EXTERN (decl) || ! constp));
6520 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6522 /* Not at top level, only `static' makes a static definition. */
6525 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6526 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6529 if (declspecs->specs[(int)ds_thread])
6530 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6532 if (TREE_PUBLIC (decl))
6534 /* [basic.link]: A name with no linkage (notably, the name of a class
6535 or enumeration declared in a local scope) shall not be used to
6536 declare an entity with linkage.
6538 Only check this for public decls for now. */
6539 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6542 if (TYPE_ANONYMOUS_P (t))
6544 if (DECL_EXTERN_C_P (decl))
6545 /* Allow this; it's pretty common in C. */
6549 /* DRs 132, 319 and 389 seem to indicate types with
6550 no linkage can only be used to declare extern "C"
6551 entities. Since it's not always an error in the
6552 ISO C++ 90 Standard, we only issue a warning. */
6553 warning (0, "non-local variable %q#D uses anonymous type",
6555 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6556 warning (0, "%q+#D does not refer to the unqualified "
6557 "type, so it is not used for linkage",
6562 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6566 DECL_INTERFACE_KNOWN (decl) = 1;
6571 /* Create and return a canonical pointer to member function type, for
6572 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6575 build_ptrmemfunc_type (tree type)
6579 tree unqualified_variant = NULL_TREE;
6581 if (type == error_mark_node)
6584 /* If a canonical type already exists for this type, use it. We use
6585 this method instead of type_hash_canon, because it only does a
6586 simple equality check on the list of field members. */
6588 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6591 /* Make sure that we always have the unqualified pointer-to-member
6593 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6595 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6597 t = make_aggr_type (RECORD_TYPE);
6598 xref_basetypes (t, NULL_TREE);
6600 /* Let the front end know this is a pointer to member function... */
6601 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6602 /* ... and not really an aggregate. */
6603 SET_IS_AGGR_TYPE (t, 0);
6605 field = build_decl (FIELD_DECL, pfn_identifier, type);
6608 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6609 TREE_CHAIN (field) = fields;
6612 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6614 /* Zap out the name so that the back end will give us the debugging
6615 information for this anonymous RECORD_TYPE. */
6616 TYPE_NAME (t) = NULL_TREE;
6618 /* If this is not the unqualified form of this pointer-to-member
6619 type, set the TYPE_MAIN_VARIANT for this type to be the
6620 unqualified type. Since they are actually RECORD_TYPEs that are
6621 not variants of each other, we must do this manually. */
6622 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6624 t = build_qualified_type (t, cp_type_quals (type));
6625 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6626 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6627 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6630 /* Cache this pointer-to-member type so that we can find it again
6632 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6634 /* Managing canonical types for the RECORD_TYPE behind a
6635 pointer-to-member function is a nightmare, so use structural
6636 equality for now. */
6637 SET_TYPE_STRUCTURAL_EQUALITY (t);
6642 /* Create and return a pointer to data member type. */
6645 build_ptrmem_type (tree class_type, tree member_type)
6647 if (TREE_CODE (member_type) == METHOD_TYPE)
6651 arg_types = TYPE_ARG_TYPES (member_type);
6652 class_type = (cp_build_qualified_type
6654 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6656 = build_method_type_directly (class_type,
6657 TREE_TYPE (member_type),
6658 TREE_CHAIN (arg_types));
6659 return build_ptrmemfunc_type (build_pointer_type (member_type));
6663 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6664 return build_offset_type (class_type, member_type);
6668 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6669 Check to see that the definition is valid. Issue appropriate error
6670 messages. Return 1 if the definition is particularly bad, or 0
6674 check_static_variable_definition (tree decl, tree type)
6676 /* Motion 10 at San Diego: If a static const integral data member is
6677 initialized with an integral constant expression, the initializer
6678 may appear either in the declaration (within the class), or in
6679 the definition, but not both. If it appears in the class, the
6680 member is a member constant. The file-scope definition is always
6682 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6684 error ("invalid in-class initialization of static data member "
6685 "of non-integral type %qT",
6687 /* If we just return the declaration, crashes will sometimes
6688 occur. We therefore return void_type_node, as if this were a
6689 friend declaration, to cause callers to completely ignore
6690 this declaration. */
6693 else if (!CP_TYPE_CONST_P (type))
6694 error ("ISO C++ forbids in-class initialization of non-const "
6695 "static member %qD",
6697 else if (pedantic && !INTEGRAL_TYPE_P (type))
6698 pedwarn ("ISO C++ forbids initialization of member constant "
6699 "%qD of non-integral type %qT", decl, type);
6704 /* Given the SIZE (i.e., number of elements) in an array, compute an
6705 appropriate index type for the array. If non-NULL, NAME is the
6706 name of the thing being declared. */
6709 compute_array_index_type (tree name, tree size)
6713 tree abi_1_itype = NULL_TREE;
6715 if (error_operand_p (size))
6716 return error_mark_node;
6718 type = TREE_TYPE (size);
6719 /* The array bound must be an integer type. */
6720 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6723 error ("size of array %qD has non-integral type %qT", name, type);
6725 error ("size of array has non-integral type %qT", type);
6726 size = integer_one_node;
6727 type = TREE_TYPE (size);
6730 if (value_dependent_expression_p (size))
6732 /* We cannot do any checking for a value-dependent SIZE. Just
6733 build the index type and mark that it requires structural
6735 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6736 size, integer_one_node));
6737 SET_TYPE_STRUCTURAL_EQUALITY (itype);
6741 if (!abi_version_at_least (2) && processing_template_decl)
6742 /* For abi-1, we handled all instances in templates the same way,
6743 even when they were non-dependent. This effects the manglings
6744 produced. So, we do the normal checking for non-dependent
6745 sizes, but at the end we'll return the same type that abi-1
6746 would have, but with TYPE_CANONICAL set to the "right"
6747 value that the current ABI would provide. */
6748 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
6749 size, integer_one_node));
6751 /* The size might be the result of a cast. */
6752 STRIP_TYPE_NOPS (size);
6754 /* It might be a const variable or enumeration constant. */
6755 size = integral_constant_value (size);
6757 /* Normally, the array-bound will be a constant. */
6758 if (TREE_CODE (size) == INTEGER_CST)
6760 /* Check to see if the array bound overflowed. Make that an
6761 error, no matter how generous we're being. */
6762 int old_flag_pedantic_errors = flag_pedantic_errors;
6763 int old_pedantic = pedantic;
6764 pedantic = flag_pedantic_errors = 1;
6765 constant_expression_warning (size);
6766 pedantic = old_pedantic;
6767 flag_pedantic_errors = old_flag_pedantic_errors;
6769 /* An array must have a positive number of elements. */
6770 if (INT_CST_LT (size, integer_zero_node))
6773 error ("size of array %qD is negative", name);
6775 error ("size of array is negative");
6776 size = integer_one_node;
6778 /* As an extension we allow zero-sized arrays. We always allow
6779 them in system headers because glibc uses them. */
6780 else if (integer_zerop (size) && pedantic && !in_system_header)
6783 pedwarn ("ISO C++ forbids zero-size array %qD", name);
6785 pedwarn ("ISO C++ forbids zero-size array");
6788 else if (TREE_CONSTANT (size))
6790 /* `(int) &fn' is not a valid array bound. */
6792 error ("size of array %qD is not an integral constant-expression",
6795 error ("size of array is not an integral constant-expression");
6796 size = integer_one_node;
6798 else if (pedantic && warn_vla != 0)
6801 pedwarn ("ISO C++ forbids variable length array %qD", name);
6803 pedwarn ("ISO C++ forbids variable length array");
6805 else if (warn_vla > 0)
6809 "variable length array %qD is used", name);
6812 "variable length array is used");
6815 if (processing_template_decl && !TREE_CONSTANT (size))
6816 /* A variable sized array. */
6817 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
6820 HOST_WIDE_INT saved_processing_template_decl;
6822 /* Compute the index of the largest element in the array. It is
6823 one less than the number of elements in the array. We save
6824 and restore PROCESSING_TEMPLATE_DECL so that computations in
6825 cp_build_binary_op will be appropriately folded. */
6826 saved_processing_template_decl = processing_template_decl;
6827 processing_template_decl = 0;
6828 itype = cp_build_binary_op (MINUS_EXPR,
6829 cp_convert (ssizetype, size),
6830 cp_convert (ssizetype, integer_one_node));
6831 itype = fold (itype);
6832 processing_template_decl = saved_processing_template_decl;
6834 if (!TREE_CONSTANT (itype))
6835 /* A variable sized array. */
6836 itype = variable_size (itype);
6837 /* Make sure that there was no overflow when creating to a signed
6838 index type. (For example, on a 32-bit machine, an array with
6839 size 2^32 - 1 is too big.) */
6840 else if (TREE_CODE (itype) == INTEGER_CST
6841 && TREE_OVERFLOW (itype))
6843 error ("overflow in array dimension");
6844 TREE_OVERFLOW (itype) = 0;
6848 /* Create and return the appropriate index type. */
6851 tree t = build_index_type (itype);
6852 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
6856 return build_index_type (itype);
6859 /* Returns the scope (if any) in which the entity declared by
6860 DECLARATOR will be located. If the entity was declared with an
6861 unqualified name, NULL_TREE is returned. */
6864 get_scope_of_declarator (const cp_declarator *declarator)
6866 while (declarator && declarator->kind != cdk_id)
6867 declarator = declarator->declarator;
6869 /* If the declarator-id is a SCOPE_REF, the scope in which the
6870 declaration occurs is the first operand. */
6872 && declarator->u.id.qualifying_scope)
6873 return declarator->u.id.qualifying_scope;
6875 /* Otherwise, the declarator is not a qualified name; the entity will
6876 be declared in the current scope. */
6880 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
6881 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
6885 create_array_type_for_decl (tree name, tree type, tree size)
6887 tree itype = NULL_TREE;
6888 const char* error_msg;
6890 /* If things have already gone awry, bail now. */
6891 if (type == error_mark_node || size == error_mark_node)
6892 return error_mark_node;
6894 /* Assume that everything will go OK. */
6897 /* There are some types which cannot be array elements. */
6898 switch (TREE_CODE (type))
6901 error_msg = "array of void";
6905 error_msg = "array of functions";
6908 case REFERENCE_TYPE:
6909 error_msg = "array of references";
6913 error_msg = "array of function members";
6920 /* If something went wrong, issue an error-message and return. */
6924 error ("declaration of %qD as %s", name, error_msg);
6926 error ("creating %s", error_msg);
6928 return error_mark_node;
6933 The constant expressions that specify the bounds of the arrays
6934 can be omitted only for the first member of the sequence. */
6935 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
6938 error ("declaration of %qD as multidimensional array must "
6939 "have bounds for all dimensions except the first",
6942 error ("multidimensional array must have bounds for all "
6943 "dimensions except the first");
6945 return error_mark_node;
6948 /* Figure out the index type for the array. */
6950 itype = compute_array_index_type (name, size);
6953 T is called the array element type; this type shall not be [...] an
6954 abstract class type. */
6955 abstract_virtuals_error (name, type);
6957 return build_cplus_array_type (type, itype);
6960 /* Check that it's OK to declare a function with the indicated TYPE.
6961 SFK indicates the kind of special function (if any) that this
6962 function is. OPTYPE is the type given in a conversion operator
6963 declaration, or the class type for a constructor/destructor.
6964 Returns the actual return type of the function; that
6965 may be different than TYPE if an error occurs, or for certain
6966 special functions. */
6969 check_special_function_return_type (special_function_kind sfk,
6975 case sfk_constructor:
6977 error ("return type specification for constructor invalid");
6979 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6980 type = build_pointer_type (optype);
6982 type = void_type_node;
6985 case sfk_destructor:
6987 error ("return type specification for destructor invalid");
6988 /* We can't use the proper return type here because we run into
6989 problems with ambiguous bases and covariant returns.
6990 Java classes are left unchanged because (void *) isn't a valid
6991 Java type, and we don't want to change the Java ABI. */
6992 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
6993 type = build_pointer_type (void_type_node);
6995 type = void_type_node;
6998 case sfk_conversion:
7000 error ("return type specified for %<operator %T%>", optype);
7011 /* A variable or data member (whose unqualified name is IDENTIFIER)
7012 has been declared with the indicated TYPE. If the TYPE is not
7013 acceptable, issue an error message and return a type to use for
7014 error-recovery purposes. */
7017 check_var_type (tree identifier, tree type)
7019 if (VOID_TYPE_P (type))
7022 error ("unnamed variable or field declared void");
7023 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7025 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7026 error ("variable or field %qE declared void", identifier);
7029 error ("variable or field declared void");
7030 type = error_mark_node;
7036 /* Given declspecs and a declarator (abstract or otherwise), determine
7037 the name and type of the object declared and construct a DECL node
7040 DECLSPECS points to the representation of declaration-specifier
7041 sequence that precedes declarator.
7043 DECL_CONTEXT says which syntactic context this declaration is in:
7044 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7045 FUNCDEF for a function definition. Like NORMAL but a few different
7046 error messages in each case. Return value may be zero meaning
7047 this definition is too screwy to try to parse.
7048 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7049 handle member functions (which have FIELD context).
7050 Return value may be zero meaning this definition is too screwy to
7052 PARM for a parameter declaration (either within a function prototype
7053 or before a function body). Make a PARM_DECL, or return void_type_node.
7054 CATCHPARM for a parameter declaration before a catch clause.
7055 TYPENAME if for a typename (in a cast or sizeof).
7056 Don't make a DECL node; just return the ..._TYPE node.
7057 FIELD for a struct or union field; make a FIELD_DECL.
7058 BITFIELD for a field with specified width.
7059 INITIALIZED is 1 if the decl has an initializer.
7061 ATTRLIST is a pointer to the list of attributes, which may be NULL
7062 if there are none; *ATTRLIST may be modified if attributes from inside
7063 the declarator should be applied to the declaration.
7065 When this function is called, scoping variables (such as
7066 CURRENT_CLASS_TYPE) should reflect the scope in which the
7067 declaration occurs, not the scope in which the new declaration will
7068 be placed. For example, on:
7072 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7075 Returns a DECL (if a declarator is present), a TYPE (if there is no
7076 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7080 grokdeclarator (const cp_declarator *declarator,
7081 const cp_decl_specifier_seq *declspecs,
7082 enum decl_context decl_context,
7086 tree type = NULL_TREE;
7088 int virtualp, explicitp, friendp, inlinep, staticp;
7089 int explicit_int = 0;
7090 int explicit_char = 0;
7091 int defaulted_int = 0;
7092 tree dependent_name = NULL_TREE;
7094 tree typedef_decl = NULL_TREE;
7095 const char *name = NULL;
7096 tree typedef_type = NULL_TREE;
7097 /* True if this declarator is a function definition. */
7098 bool funcdef_flag = false;
7099 cp_declarator_kind innermost_code = cdk_error;
7102 /* See the code below that used this. */
7103 tree decl_attr = NULL_TREE;
7106 /* Keep track of what sort of function is being processed
7107 so that we can warn about default return values, or explicit
7108 return values which do not match prescribed defaults. */
7109 special_function_kind sfk = sfk_none;
7111 tree dname = NULL_TREE;
7112 tree ctor_return_type = NULL_TREE;
7113 enum overload_flags flags = NO_SPECIAL;
7114 /* cv-qualifiers that apply to the declarator, for a declaration of
7115 a member function. */
7116 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7117 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7119 tree raises = NULL_TREE;
7120 int template_count = 0;
7121 tree returned_attrs = NULL_TREE;
7122 tree parms = NULL_TREE;
7123 const cp_declarator *id_declarator;
7124 /* The unqualified name of the declarator; either an
7125 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7126 tree unqualified_id;
7127 /* The class type, if any, in which this entity is located,
7128 or NULL_TREE if none. Note that this value may be different from
7129 the current class type; for example if an attempt is made to declare
7130 "A::f" inside "B", this value will be "A". */
7131 tree ctype = current_class_type;
7132 /* The NAMESPACE_DECL for the namespace in which this entity is
7133 located. If an unqualified name is used to declare the entity,
7134 this value will be NULL_TREE, even if the entity is located at
7136 tree in_namespace = NULL_TREE;
7137 cp_storage_class storage_class;
7138 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7139 bool type_was_error_mark_node = false;
7140 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7141 bool set_no_warning = false;
7143 signed_p = declspecs->specs[(int)ds_signed];
7144 unsigned_p = declspecs->specs[(int)ds_unsigned];
7145 short_p = declspecs->specs[(int)ds_short];
7146 long_p = declspecs->specs[(int)ds_long];
7147 longlong = declspecs->specs[(int)ds_long] >= 2;
7148 thread_p = declspecs->specs[(int)ds_thread];
7150 if (decl_context == FUNCDEF)
7151 funcdef_flag = true, decl_context = NORMAL;
7152 else if (decl_context == MEMFUNCDEF)
7153 funcdef_flag = true, decl_context = FIELD;
7154 else if (decl_context == BITFIELD)
7155 bitfield = 1, decl_context = FIELD;
7157 /* Look inside a declarator for the name being declared
7158 and get it as a string, for an error message. */
7159 for (id_declarator = declarator;
7161 id_declarator = id_declarator->declarator)
7163 if (id_declarator->kind != cdk_id)
7164 innermost_code = id_declarator->kind;
7166 switch (id_declarator->kind)
7169 if (id_declarator->declarator
7170 && id_declarator->declarator->kind == cdk_id)
7172 sfk = id_declarator->declarator->u.id.sfk;
7173 if (sfk == sfk_destructor)
7180 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7181 tree decl = id_declarator->u.id.unqualified_name;
7184 if (qualifying_scope)
7186 if (at_function_scope_p ())
7190 A declarator-id shall not be qualified except
7193 None of the cases are permitted in block
7195 if (qualifying_scope == global_namespace)
7196 error ("invalid use of qualified-name %<::%D%>",
7198 else if (TYPE_P (qualifying_scope))
7199 error ("invalid use of qualified-name %<%T::%D%>",
7200 qualifying_scope, decl);
7202 error ("invalid use of qualified-name %<%D::%D%>",
7203 qualifying_scope, decl);
7204 return error_mark_node;
7206 else if (TYPE_P (qualifying_scope))
7208 ctype = qualifying_scope;
7209 if (innermost_code != cdk_function
7210 && current_class_type
7211 && !UNIQUELY_DERIVED_FROM_P (ctype,
7212 current_class_type))
7214 error ("type %qT is not derived from type %qT",
7215 ctype, current_class_type);
7216 return error_mark_node;
7219 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7220 in_namespace = qualifying_scope;
7222 switch (TREE_CODE (decl))
7228 if (innermost_code != cdk_function)
7230 error ("declaration of %qD as non-function", decl);
7231 return error_mark_node;
7233 else if (!qualifying_scope
7234 && !(current_class_type && at_class_scope_p ()))
7236 error ("declaration of %qD as non-member", decl);
7237 return error_mark_node;
7240 type = TREE_OPERAND (decl, 0);
7241 name = IDENTIFIER_POINTER (constructor_name (type));
7246 case TEMPLATE_ID_EXPR:
7248 tree fns = TREE_OPERAND (decl, 0);
7251 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7253 gcc_assert (is_overloaded_fn (dname));
7254 dname = DECL_NAME (get_first_fn (dname));
7259 case IDENTIFIER_NODE:
7260 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7263 if (C_IS_RESERVED_WORD (dname))
7265 error ("declarator-id missing; using reserved word %qD",
7267 name = IDENTIFIER_POINTER (dname);
7269 else if (!IDENTIFIER_TYPENAME_P (dname))
7270 name = IDENTIFIER_POINTER (dname);
7273 gcc_assert (flags == NO_SPECIAL);
7274 flags = TYPENAME_FLAG;
7275 ctor_return_type = TREE_TYPE (dname);
7276 sfk = sfk_conversion;
7277 if (is_typename_at_global_scope (dname))
7278 name = IDENTIFIER_POINTER (dname);
7280 name = "<invalid operator>";
7297 return error_mark_node;
7302 if (id_declarator->kind == cdk_id)
7308 The declarator in a function-definition shall have the form
7309 D1 ( parameter-declaration-clause) ... */
7310 if (funcdef_flag && innermost_code != cdk_function)
7312 error ("function definition does not declare parameters");
7313 return error_mark_node;
7316 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7317 && innermost_code != cdk_function
7318 && ! (ctype && !declspecs->any_specifiers_p))
7320 error ("declaration of %qD as non-function", dname);
7321 return error_mark_node;
7324 /* Anything declared one level down from the top level
7325 must be one of the parameters of a function
7326 (because the body is at least two levels down). */
7328 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7329 by not allowing C++ class definitions to specify their parameters
7330 with xdecls (must be spec.d in the parmlist).
7332 Since we now wait to push a class scope until we are sure that
7333 we are in a legitimate method context, we must set oldcname
7334 explicitly (since current_class_name is not yet alive).
7336 We also want to avoid calling this a PARM if it is in a namespace. */
7338 if (decl_context == NORMAL && !toplevel_bindings_p ())
7340 struct cp_binding_level *b = current_binding_level;
7341 current_binding_level = b->level_chain;
7342 if (current_binding_level != 0 && toplevel_bindings_p ())
7343 decl_context = PARM;
7344 current_binding_level = b;
7348 name = decl_context == PARM ? "parameter" : "type name";
7350 /* If there were multiple types specified in the decl-specifier-seq,
7351 issue an error message. */
7352 if (declspecs->multiple_types_p)
7354 error ("two or more data types in declaration of %qs", name);
7355 return error_mark_node;
7358 /* Extract the basic type from the decl-specifier-seq. */
7359 type = declspecs->type;
7360 if (type == error_mark_node)
7363 type_was_error_mark_node = true;
7365 /* If the entire declaration is itself tagged as deprecated then
7366 suppress reports of deprecated items. */
7367 if (type && TREE_DEPRECATED (type)
7368 && deprecated_state != DEPRECATED_SUPPRESS)
7369 warn_deprecated_use (type);
7370 if (type && TREE_CODE (type) == TYPE_DECL)
7372 typedef_decl = type;
7373 type = TREE_TYPE (typedef_decl);
7375 /* No type at all: default to `int', and set DEFAULTED_INT
7376 because it was not a user-defined typedef. */
7377 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7379 /* These imply 'int'. */
7380 type = integer_type_node;
7384 explicit_int = declspecs->explicit_int_p;
7385 explicit_char = declspecs->explicit_char_p;
7388 /* See the code below that used this. */
7390 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7392 typedef_type = type;
7395 if (sfk != sfk_conversion)
7396 ctor_return_type = ctype;
7398 if (sfk != sfk_none)
7399 type = check_special_function_return_type (sfk, type,
7401 else if (type == NULL_TREE)
7407 /* We handle `main' specially here, because 'main () { }' is so
7408 common. With no options, it is allowed. With -Wreturn-type,
7409 it is a warning. It is only an error with -pedantic-errors. */
7410 is_main = (funcdef_flag
7411 && dname && MAIN_NAME_P (dname)
7412 && ctype == NULL_TREE
7413 && in_namespace == NULL_TREE
7414 && current_namespace == global_namespace);
7416 if (type_was_error_mark_node)
7417 /* We've already issued an error, don't complain more. */;
7418 else if (in_system_header || flag_ms_extensions)
7419 /* Allow it, sigh. */;
7420 else if (pedantic || ! is_main)
7421 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7423 warning (OPT_Wreturn_type,
7424 "ISO C++ forbids declaration of %qs with no type", name);
7426 type = integer_type_node;
7431 /* Now process the modifiers that were specified
7432 and check for invalid combinations. */
7434 /* Long double is a special combination. */
7435 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7438 type = build_qualified_type (long_double_type_node,
7439 cp_type_quals (type));
7442 /* Check all other uses of type modifiers. */
7444 if (unsigned_p || signed_p || long_p || short_p)
7448 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7449 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7450 else if (signed_p && unsigned_p)
7451 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7452 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7453 error ("%<long long%> invalid for %qs", name);
7454 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7455 error ("%<long%> invalid for %qs", name);
7456 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7457 error ("%<short%> invalid for %qs", name);
7458 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7459 error ("%<long%> or %<short%> invalid for %qs", name);
7460 else if ((long_p || short_p) && explicit_char)
7461 error ("%<long%> or %<short%> specified with char for %qs", name);
7462 else if (long_p && short_p)
7463 error ("%<long%> and %<short%> specified together for %qs", name);
7467 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7469 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7471 if (flag_pedantic_errors)
7476 /* Discard the type modifiers if they are invalid. */
7487 /* Decide whether an integer type is signed or not.
7488 Optionally treat bitfields as signed by default. */
7492 It is implementation-defined whether a plain (neither
7493 explicitly signed or unsigned) char, short, int, or long
7494 bit-field is signed or unsigned.
7496 Naturally, we extend this to long long as well. Note that
7497 this does not include wchar_t. */
7498 || (bitfield && !flag_signed_bitfields
7500 /* A typedef for plain `int' without `signed' can be
7501 controlled just like plain `int', but a typedef for
7502 `signed int' cannot be so controlled. */
7504 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7505 && TREE_CODE (type) == INTEGER_TYPE
7506 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7509 type = long_long_unsigned_type_node;
7511 type = long_unsigned_type_node;
7513 type = short_unsigned_type_node;
7514 else if (type == char_type_node)
7515 type = unsigned_char_type_node;
7516 else if (typedef_decl)
7517 type = unsigned_type_for (type);
7519 type = unsigned_type_node;
7521 else if (signed_p && type == char_type_node)
7522 type = signed_char_type_node;
7524 type = long_long_integer_type_node;
7526 type = long_integer_type_node;
7528 type = short_integer_type_node;
7530 if (declspecs->specs[(int)ds_complex])
7532 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7533 error ("complex invalid for %qs", name);
7534 /* If we just have "complex", it is equivalent to
7535 "complex double", but if any modifiers at all are specified it is
7536 the complex form of TYPE. E.g, "complex short" is
7537 "complex short int". */
7539 else if (defaulted_int && ! longlong
7540 && ! (long_p || short_p || signed_p || unsigned_p))
7541 type = complex_double_type_node;
7542 else if (type == integer_type_node)
7543 type = complex_integer_type_node;
7544 else if (type == float_type_node)
7545 type = complex_float_type_node;
7546 else if (type == double_type_node)
7547 type = complex_double_type_node;
7548 else if (type == long_double_type_node)
7549 type = complex_long_double_type_node;
7551 type = build_complex_type (type);
7554 type_quals = TYPE_UNQUALIFIED;
7555 if (declspecs->specs[(int)ds_const])
7556 type_quals |= TYPE_QUAL_CONST;
7557 if (declspecs->specs[(int)ds_volatile])
7558 type_quals |= TYPE_QUAL_VOLATILE;
7559 if (declspecs->specs[(int)ds_restrict])
7560 type_quals |= TYPE_QUAL_RESTRICT;
7561 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7562 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7565 if (TREE_CODE (type) == FUNCTION_TYPE
7566 && type_quals != TYPE_UNQUALIFIED)
7568 /* This was an error in C++98 (cv-qualifiers cannot be added to
7569 a function type), but DR 295 makes the code well-formed by
7570 dropping the extra qualifiers. */
7573 tree bad_type = build_qualified_type (type, type_quals);
7574 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7577 type_quals = TYPE_UNQUALIFIED;
7579 type_quals |= cp_type_quals (type);
7580 type = cp_build_qualified_type_real
7581 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7582 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7583 /* We might have ignored or rejected some of the qualifiers. */
7584 type_quals = cp_type_quals (type);
7587 inlinep = !! declspecs->specs[(int)ds_inline];
7588 virtualp = !! declspecs->specs[(int)ds_virtual];
7589 explicitp = !! declspecs->specs[(int)ds_explicit];
7591 storage_class = declspecs->storage_class;
7592 if (storage_class == sc_static)
7593 staticp = 1 + (decl_context == FIELD);
7595 if (virtualp && staticp == 2)
7597 error ("member %qD cannot be declared both virtual and static", dname);
7598 storage_class = sc_none;
7601 friendp = !! declspecs->specs[(int)ds_friend];
7603 if (dependent_name && !friendp)
7605 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7606 return error_mark_node;
7609 /* Issue errors about use of storage classes for parameters. */
7610 if (decl_context == PARM)
7612 if (declspecs->specs[(int)ds_typedef])
7614 error ("typedef declaration invalid in parameter declaration");
7615 return error_mark_node;
7617 else if (storage_class == sc_static
7618 || storage_class == sc_extern
7620 error ("storage class specifiers invalid in parameter declarations");
7623 /* Give error if `virtual' is used outside of class declaration. */
7625 && (current_class_name == NULL_TREE || decl_context != FIELD))
7627 error ("virtual outside class declaration");
7631 /* Static anonymous unions are dealt with here. */
7632 if (staticp && decl_context == TYPENAME
7634 && ANON_AGGR_TYPE_P (declspecs->type))
7635 decl_context = FIELD;
7637 /* Warn about storage classes that are invalid for certain
7638 kinds of declarations (parameters, typenames, etc.). */
7641 && storage_class != sc_extern
7642 && storage_class != sc_static)
7643 || declspecs->specs[(int)ds_typedef]))
7645 error ("multiple storage classes in declaration of %qs", name);
7648 if (declspecs->conflicting_specifiers_p)
7650 error ("conflicting specifiers in declaration of %qs", name);
7651 storage_class = sc_none;
7653 else if (decl_context != NORMAL
7654 && ((storage_class != sc_none
7655 && storage_class != sc_mutable)
7658 if ((decl_context == PARM || decl_context == CATCHPARM)
7659 && (storage_class == sc_register
7660 || storage_class == sc_auto))
7662 else if (declspecs->specs[(int)ds_typedef])
7664 else if (decl_context == FIELD
7665 /* C++ allows static class elements. */
7666 && storage_class == sc_static)
7667 /* C++ also allows inlines and signed and unsigned elements,
7668 but in those cases we don't come in here. */
7672 if (decl_context == FIELD)
7673 error ("storage class specified for %qs", name);
7676 if (decl_context == PARM || decl_context == CATCHPARM)
7677 error ("storage class specified for parameter %qs", name);
7679 error ("storage class specified for typename");
7681 if (storage_class == sc_register
7682 || storage_class == sc_auto
7683 || storage_class == sc_extern
7685 storage_class = sc_none;
7688 else if (storage_class == sc_extern && initialized
7691 if (toplevel_bindings_p ())
7693 /* It's common practice (and completely valid) to have a const
7694 be initialized and declared extern. */
7695 if (!(type_quals & TYPE_QUAL_CONST))
7696 warning (0, "%qs initialized and declared %<extern%>", name);
7699 error ("%qs has both %<extern%> and initializer", name);
7701 else if (storage_class == sc_extern && funcdef_flag
7702 && ! toplevel_bindings_p ())
7703 error ("nested function %qs declared %<extern%>", name);
7704 else if (toplevel_bindings_p ())
7706 if (storage_class == sc_auto)
7707 error ("top-level declaration of %qs specifies %<auto%>", name);
7710 && storage_class != sc_extern
7711 && storage_class != sc_static)
7713 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7718 if (storage_class && friendp)
7719 error ("storage class specifiers invalid in friend function declarations");
7722 unqualified_id = NULL_TREE;
7725 unqualified_id = id_declarator->u.id.unqualified_name;
7726 switch (TREE_CODE (unqualified_id))
7730 = constructor_name (TREE_OPERAND (unqualified_id, 0));
7733 case IDENTIFIER_NODE:
7734 case TEMPLATE_ID_EXPR:
7742 /* Determine the type of the entity declared by recurring on the
7744 for (; declarator; declarator = declarator->declarator)
7746 const cp_declarator *inner_declarator;
7749 if (type == error_mark_node)
7750 return error_mark_node;
7752 attrs = declarator->attributes;
7758 if (declarator == NULL || declarator->kind == cdk_id)
7759 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
7760 if (declarator->kind == cdk_function)
7761 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
7762 if (declarator->kind == cdk_array)
7763 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
7764 returned_attrs = decl_attributes (&type,
7765 chainon (returned_attrs, attrs),
7769 if (declarator->kind == cdk_id)
7772 inner_declarator = declarator->declarator;
7774 switch (declarator->kind)
7777 type = create_array_type_for_decl (dname, type,
7778 declarator->u.array.bounds);
7786 /* Declaring a function type.
7787 Make sure we have a valid type for the function to return. */
7789 if (type_quals != TYPE_UNQUALIFIED)
7791 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
7792 warning (OPT_Wreturn_type,
7793 "type qualifiers ignored on function return type");
7794 /* We now know that the TYPE_QUALS don't apply to the
7795 decl, but to its return type. */
7796 type_quals = TYPE_UNQUALIFIED;
7797 set_no_warning = true;
7800 /* Warn about some types functions can't return. */
7802 if (TREE_CODE (type) == FUNCTION_TYPE)
7804 error ("%qs declared as function returning a function", name);
7805 type = integer_type_node;
7807 if (TREE_CODE (type) == ARRAY_TYPE)
7809 error ("%qs declared as function returning an array", name);
7810 type = integer_type_node;
7813 /* Pick up type qualifiers which should be applied to `this'. */
7814 memfn_quals = declarator->u.function.qualifiers;
7816 /* Pick up the exception specifications. */
7817 raises = declarator->u.function.exception_specification;
7819 /* Say it's a definition only for the CALL_EXPR
7820 closest to the identifier. */
7821 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
7823 if (ctype == NULL_TREE
7824 && decl_context == FIELD
7826 && (friendp == 0 || dname == current_class_name))
7827 ctype = current_class_type;
7829 if (ctype && (sfk == sfk_constructor
7830 || sfk == sfk_destructor))
7832 /* We are within a class's scope. If our declarator name
7833 is the same as the class name, and we are defining
7834 a function, then it is a constructor/destructor, and
7835 therefore returns a void type. */
7837 /* ISO C++ 12.4/2. A destructor may not be declared
7838 const or volatile. A destructor may not be
7841 ISO C++ 12.1. A constructor may not be declared
7842 const or volatile. A constructor may not be
7843 virtual. A constructor may not be static. */
7845 error ((flags == DTOR_FLAG)
7846 ? "destructor cannot be static member function"
7847 : "constructor cannot be static member function");
7850 error ((flags == DTOR_FLAG)
7851 ? "destructors may not be cv-qualified"
7852 : "constructors may not be cv-qualified");
7853 memfn_quals = TYPE_UNQUALIFIED;
7856 if (decl_context == FIELD
7857 && !member_function_or_else (ctype,
7860 return error_mark_node;
7862 if (flags != DTOR_FLAG)
7864 /* It's a constructor. */
7869 pedwarn ("constructors cannot be declared virtual");
7872 if (decl_context == FIELD
7873 && sfk != sfk_constructor)
7874 return error_mark_node;
7876 if (decl_context == FIELD)
7882 error ("can't initialize friend function %qs", name);
7885 /* Cannot be both friend and virtual. */
7886 error ("virtual functions cannot be friends");
7889 if (decl_context == NORMAL)
7890 error ("friend declaration not in class definition");
7891 if (current_function_decl && funcdef_flag)
7892 error ("can't define friend function %qs in a local "
7897 arg_types = grokparms (declarator->u.function.parameters,
7900 if (inner_declarator
7901 && inner_declarator->kind == cdk_id
7902 && inner_declarator->u.id.sfk == sfk_destructor
7903 && arg_types != void_list_node)
7905 error ("destructors may not have parameters");
7906 arg_types = void_list_node;
7910 type = build_function_type (type, arg_types);
7917 /* Filter out pointers-to-references and references-to-references.
7918 We can get these if a TYPE_DECL is used. */
7920 if (TREE_CODE (type) == REFERENCE_TYPE)
7922 if (declarator->kind != cdk_reference)
7924 error ("cannot declare pointer to %q#T", type);
7925 type = TREE_TYPE (type);
7928 /* In C++0x, we allow reference to reference declarations
7929 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
7930 and template type arguments [14.3.1/4 temp.arg.type]. The
7931 check for direct reference to reference declarations, which
7932 are still forbidden, occurs below. Reasoning behind the change
7933 can be found in DR106, DR540, and the rvalue reference
7935 else if (cxx_dialect == cxx98)
7937 error ("cannot declare reference to %q#T", type);
7938 type = TREE_TYPE (type);
7941 else if (VOID_TYPE_P (type))
7943 if (declarator->kind == cdk_reference)
7944 error ("cannot declare reference to %q#T", type);
7945 else if (declarator->kind == cdk_ptrmem)
7946 error ("cannot declare pointer to %q#T member", type);
7949 /* We now know that the TYPE_QUALS don't apply to the decl,
7950 but to the target of the pointer. */
7951 type_quals = TYPE_UNQUALIFIED;
7953 if (declarator->kind == cdk_ptrmem
7954 && (TREE_CODE (type) == FUNCTION_TYPE || memfn_quals))
7956 memfn_quals |= cp_type_quals (type);
7957 type = build_memfn_type (type,
7958 declarator->u.pointer.class_type,
7960 memfn_quals = TYPE_UNQUALIFIED;
7963 if (declarator->kind == cdk_reference)
7965 /* In C++0x, the type we are creating a reference to might be
7966 a typedef which is itself a reference type. In that case,
7967 we follow the reference collapsing rules in
7968 [7.1.3/8 dcl.typedef] to create the final reference type:
7970 "If a typedef TD names a type that is a reference to a type
7971 T, an attempt to create the type 'lvalue reference to cv TD'
7972 creates the type 'lvalue reference to T,' while an attempt
7973 to create the type "rvalue reference to cv TD' creates the
7976 if (!VOID_TYPE_P (type))
7977 type = cp_build_reference_type
7978 ((TREE_CODE (type) == REFERENCE_TYPE
7979 ? TREE_TYPE (type) : type),
7980 (declarator->u.reference.rvalue_ref
7981 && (TREE_CODE(type) != REFERENCE_TYPE
7982 || TYPE_REF_IS_RVALUE (type))));
7984 /* In C++0x, we need this check for direct reference to
7985 reference declarations, which are forbidden by
7986 [8.3.2/5 dcl.ref]. Reference to reference declarations
7987 are only allowed indirectly through typedefs and template
7988 type arguments. Example:
7990 void foo(int & &); // invalid ref-to-ref decl
7992 typedef int & int_ref;
7993 void foo(int_ref &); // valid ref-to-ref decl
7995 if (inner_declarator && inner_declarator->kind == cdk_reference)
7996 error ("cannot declare reference to %q#T, which is not "
7997 "a typedef or a template type argument", type);
7999 else if (TREE_CODE (type) == METHOD_TYPE)
8000 type = build_ptrmemfunc_type (build_pointer_type (type));
8001 else if (declarator->kind == cdk_ptrmem)
8003 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8005 if (declarator->u.pointer.class_type == error_mark_node)
8006 /* We will already have complained. */
8007 type = error_mark_node;
8009 type = build_ptrmem_type (declarator->u.pointer.class_type,
8013 type = build_pointer_type (type);
8015 /* Process a list of type modifier keywords (such as
8016 const or volatile) that were given inside the `*' or `&'. */
8018 if (declarator->u.pointer.qualifiers)
8021 = cp_build_qualified_type (type,
8022 declarator->u.pointer.qualifiers);
8023 type_quals = cp_type_quals (type);
8036 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8037 && TREE_CODE (type) != FUNCTION_TYPE
8038 && TREE_CODE (type) != METHOD_TYPE)
8040 error ("template-id %qD used as a declarator",
8042 unqualified_id = dname;
8045 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8046 qualified with a class-name, turn it into a METHOD_TYPE, unless
8047 we know that the function is static. We take advantage of this
8048 opportunity to do other processing that pertains to entities
8049 explicitly declared to be class members. Note that if DECLARATOR
8050 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8051 would not have exited the loop above. */
8053 && declarator->u.id.qualifying_scope
8054 && TYPE_P (declarator->u.id.qualifying_scope))
8058 ctype = declarator->u.id.qualifying_scope;
8059 ctype = TYPE_MAIN_VARIANT (ctype);
8061 while (t != NULL_TREE && CLASS_TYPE_P (t))
8063 /* You're supposed to have one `template <...>' for every
8064 template class, but you don't need one for a full
8065 specialization. For example:
8067 template <class T> struct S{};
8068 template <> struct S<int> { void f(); };
8069 void S<int>::f () {}
8071 is correct; there shouldn't be a `template <>' for the
8072 definition of `S<int>::f'. */
8073 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8074 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8075 /* T is an explicit (not partial) specialization. All
8076 containing classes must therefore also be explicitly
8079 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8080 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8081 template_count += 1;
8083 t = TYPE_MAIN_DECL (t);
8084 t = DECL_CONTEXT (t);
8087 if (ctype == current_class_type)
8091 pedwarn ("member functions are implicitly friends of their class");
8095 pedwarn ("extra qualification %<%T::%> on member %qs",
8098 else if (/* If the qualifying type is already complete, then we
8099 can skip the following checks. */
8100 !COMPLETE_TYPE_P (ctype)
8101 && (/* If the function is being defined, then
8102 qualifying type must certainly be complete. */
8104 /* A friend declaration of "T::f" is OK, even if
8105 "T" is a template parameter. But, if this
8106 function is not a friend, the qualifying type
8108 || (!friendp && !CLASS_TYPE_P (ctype))
8109 /* For a declaration, the type need not be
8110 complete, if either it is dependent (since there
8111 is no meaningful definition of complete in that
8112 case) or the qualifying class is currently being
8114 || !(dependent_type_p (ctype)
8115 || currently_open_class (ctype)))
8116 /* Check that the qualifying type is complete. */
8117 && !complete_type_or_else (ctype, NULL_TREE))
8118 return error_mark_node;
8119 else if (TREE_CODE (type) == FUNCTION_TYPE)
8121 tree sname = declarator->u.id.unqualified_name;
8123 if (current_class_type
8124 && (!friendp || funcdef_flag))
8127 ? "cannot define member function %<%T::%s%> within %<%T%>"
8128 : "cannot declare member function %<%T::%s%> within %<%T%>",
8129 ctype, name, current_class_type);
8130 return error_mark_node;
8133 if (TREE_CODE (sname) == IDENTIFIER_NODE
8134 && NEW_DELETE_OPNAME_P (sname))
8135 /* Overloaded operator new and operator delete
8136 are always static functions. */
8139 type = build_memfn_type (type, ctype, memfn_quals);
8141 else if (declspecs->specs[(int)ds_typedef]
8142 && current_class_type)
8144 error ("cannot declare member %<%T::%s%> within %qT",
8145 ctype, name, current_class_type);
8146 return error_mark_node;
8150 /* Now TYPE has the actual type. */
8155 *attrlist = chainon (returned_attrs, *attrlist);
8157 attrlist = &returned_attrs;
8160 /* Handle parameter packs. */
8161 if (parameter_pack_p)
8163 if (decl_context == PARM)
8164 /* Turn the type into a pack expansion.*/
8165 type = make_pack_expansion (type);
8167 error ("non-parameter %qs cannot be a parameter pack", name);
8170 /* Did array size calculations overflow? */
8172 if (TREE_CODE (type) == ARRAY_TYPE
8173 && COMPLETE_TYPE_P (type)
8174 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8175 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8177 error ("size of array %qs is too large", name);
8178 /* If we proceed with the array type as it is, we'll eventually
8179 crash in tree_low_cst(). */
8180 type = error_mark_node;
8183 if ((decl_context == FIELD || decl_context == PARM)
8184 && !processing_template_decl
8185 && variably_modified_type_p (type, NULL_TREE))
8187 if (decl_context == FIELD)
8188 error ("data member may not have variably modified type %qT", type);
8190 error ("parameter may not have variably modified type %qT", type);
8191 type = error_mark_node;
8194 if (explicitp == 1 || (explicitp && friendp))
8196 /* [dcl.fct.spec] The explicit specifier shall only be used in
8197 declarations of constructors within a class definition. */
8198 error ("only declarations of constructors can be %<explicit%>");
8202 if (storage_class == sc_mutable)
8204 if (decl_context != FIELD || friendp)
8206 error ("non-member %qs cannot be declared %<mutable%>", name);
8207 storage_class = sc_none;
8209 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8211 error ("non-object member %qs cannot be declared %<mutable%>", name);
8212 storage_class = sc_none;
8214 else if (TREE_CODE (type) == FUNCTION_TYPE
8215 || TREE_CODE (type) == METHOD_TYPE)
8217 error ("function %qs cannot be declared %<mutable%>", name);
8218 storage_class = sc_none;
8222 error ("static %qs cannot be declared %<mutable%>", name);
8223 storage_class = sc_none;
8225 else if (type_quals & TYPE_QUAL_CONST)
8227 error ("const %qs cannot be declared %<mutable%>", name);
8228 storage_class = sc_none;
8232 /* If this is declaring a typedef name, return a TYPE_DECL. */
8233 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8237 /* Note that the grammar rejects storage classes
8238 in typenames, fields or parameters. */
8239 if (current_lang_name == lang_name_java)
8240 TYPE_FOR_JAVA (type) = 1;
8242 /* This declaration:
8244 typedef void f(int) const;
8246 declares a function type which is not a member of any
8247 particular class, but which is cv-qualified; for
8248 example "f S::*" declares a pointer to a const-qualified
8249 member function of S. We record the cv-qualification in the
8251 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8253 type = cp_build_qualified_type (type, memfn_quals);
8255 /* We have now dealt with these qualifiers. */
8256 memfn_quals = TYPE_UNQUALIFIED;
8259 if (decl_context == FIELD)
8260 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8262 decl = build_decl (TYPE_DECL, unqualified_id, type);
8263 if (id_declarator && declarator->u.id.qualifying_scope)
8264 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8266 if (decl_context != FIELD)
8268 if (!current_function_decl)
8269 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8270 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8271 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8272 (current_function_decl)))
8273 /* The TYPE_DECL is "abstract" because there will be
8274 clones of this constructor/destructor, and there will
8275 be copies of this TYPE_DECL generated in those
8277 DECL_ABSTRACT (decl) = 1;
8279 else if (constructor_name_p (unqualified_id, current_class_type))
8280 pedwarn ("ISO C++ forbids nested type %qD with same name "
8281 "as enclosing class",
8284 /* If the user declares "typedef struct {...} foo" then the
8285 struct will have an anonymous name. Fill that name in now.
8286 Nothing can refer to it, so nothing needs know about the name
8288 if (type != error_mark_node
8291 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8292 && TYPE_ANONYMOUS_P (type)
8293 /* Don't do this if there are attributes. */
8294 && (!attrlist || !*attrlist)
8295 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8297 tree oldname = TYPE_NAME (type);
8300 /* Replace the anonymous name with the real name everywhere. */
8301 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8302 if (TYPE_NAME (t) == oldname)
8303 TYPE_NAME (t) = decl;
8305 if (TYPE_LANG_SPECIFIC (type))
8306 TYPE_WAS_ANONYMOUS (type) = 1;
8308 /* If this is a typedef within a template class, the nested
8309 type is a (non-primary) template. The name for the
8310 template needs updating as well. */
8311 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8312 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8313 = TYPE_IDENTIFIER (type);
8315 /* FIXME remangle member functions; member functions of a
8316 type with external linkage have external linkage. */
8320 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8321 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8323 bad_specifiers (decl, "type", virtualp,
8324 memfn_quals != TYPE_UNQUALIFIED,
8325 inlinep, friendp, raises != NULL_TREE);
8330 /* Detect the case of an array type of unspecified size
8331 which came, as such, direct from a typedef name.
8332 We must copy the type, so that the array's domain can be
8333 individually set by the object's initializer. */
8335 if (type && typedef_type
8336 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8337 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8338 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8340 /* Detect where we're using a typedef of function type to declare a
8341 function. PARMS will not be set, so we must create it now. */
8343 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8345 tree decls = NULL_TREE;
8348 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8350 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8352 TREE_CHAIN (decl) = decls;
8356 parms = nreverse (decls);
8358 if (decl_context != TYPENAME)
8360 /* A cv-qualifier-seq shall only be part of the function type
8361 for a non-static member function. [8.3.5/4 dcl.fct] */
8362 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8363 && (current_class_type == NULL_TREE || staticp) )
8366 ? G_("qualified function types cannot be used to "
8367 "declare static member functions")
8368 : G_("qualified function types cannot be used to "
8369 "declare free functions"));
8370 type = TYPE_MAIN_VARIANT (type);
8373 /* The qualifiers on the function type become the qualifiers on
8374 the non-static member function. */
8375 memfn_quals |= cp_type_quals (type);
8379 /* If this is a type name (such as, in a cast or sizeof),
8380 compute the type and return it now. */
8382 if (decl_context == TYPENAME)
8384 /* Note that the grammar rejects storage classes
8385 in typenames, fields or parameters. */
8386 if (type_quals != TYPE_UNQUALIFIED)
8387 type_quals = TYPE_UNQUALIFIED;
8389 /* Special case: "friend class foo" looks like a TYPENAME context. */
8392 if (type_quals != TYPE_UNQUALIFIED)
8394 error ("type qualifiers specified for friend class declaration");
8395 type_quals = TYPE_UNQUALIFIED;
8399 error ("%<inline%> specified for friend class declaration");
8405 /* Don't allow friend declaration without a class-key. */
8406 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8407 pedwarn ("template parameters cannot be friends");
8408 else if (TREE_CODE (type) == TYPENAME_TYPE)
8409 pedwarn ("friend declaration requires class-key, "
8410 "i.e. %<friend class %T::%D%>",
8411 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8413 pedwarn ("friend declaration requires class-key, "
8414 "i.e. %<friend %#T%>",
8418 /* Only try to do this stuff if we didn't already give up. */
8419 if (type != integer_type_node)
8421 /* A friendly class? */
8422 if (current_class_type)
8423 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8426 error ("trying to make class %qT a friend of global scope",
8429 type = void_type_node;
8432 else if (memfn_quals)
8434 if (ctype == NULL_TREE)
8436 if (TREE_CODE (type) != METHOD_TYPE)
8437 error ("invalid qualifiers on non-member function type");
8439 ctype = TYPE_METHOD_BASETYPE (type);
8442 type = build_memfn_type (type, ctype, memfn_quals);
8447 else if (unqualified_id == NULL_TREE && decl_context != PARM
8448 && decl_context != CATCHPARM
8449 && TREE_CODE (type) != UNION_TYPE
8452 error ("abstract declarator %qT used as declaration", type);
8453 return error_mark_node;
8456 /* Only functions may be declared using an operator-function-id. */
8458 && IDENTIFIER_OPNAME_P (unqualified_id)
8459 && TREE_CODE (type) != FUNCTION_TYPE
8460 && TREE_CODE (type) != METHOD_TYPE)
8462 error ("declaration of %qD as non-function", unqualified_id);
8463 return error_mark_node;
8466 /* We don't check parameter types here because we can emit a better
8467 error message later. */
8468 if (decl_context != PARM)
8470 type = check_var_type (unqualified_id, type);
8471 if (type == error_mark_node)
8472 return error_mark_node;
8475 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8476 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8478 if (decl_context == PARM || decl_context == CATCHPARM)
8480 if (ctype || in_namespace)
8481 error ("cannot use %<::%> in parameter declaration");
8483 /* A parameter declared as an array of T is really a pointer to T.
8484 One declared as a function is really a pointer to a function.
8485 One declared as a member is really a pointer to member. */
8487 if (TREE_CODE (type) == ARRAY_TYPE)
8489 /* Transfer const-ness of array into that of type pointed to. */
8490 type = build_pointer_type (TREE_TYPE (type));
8491 type_quals = TYPE_UNQUALIFIED;
8493 else if (TREE_CODE (type) == FUNCTION_TYPE)
8494 type = build_pointer_type (type);
8500 if (decl_context == PARM)
8502 decl = cp_build_parm_decl (unqualified_id, type);
8504 bad_specifiers (decl, "parameter", virtualp,
8505 memfn_quals != TYPE_UNQUALIFIED,
8506 inlinep, friendp, raises != NULL_TREE);
8508 else if (decl_context == FIELD)
8510 /* The C99 flexible array extension. */
8511 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8512 && TYPE_DOMAIN (type) == NULL_TREE)
8514 tree itype = compute_array_index_type (dname, integer_zero_node);
8515 type = build_cplus_array_type (TREE_TYPE (type), itype);
8518 if (type == error_mark_node)
8520 /* Happens when declaring arrays of sizes which
8521 are error_mark_node, for example. */
8524 else if (in_namespace && !friendp)
8526 /* Something like struct S { int N::j; }; */
8527 error ("invalid use of %<::%>");
8528 return error_mark_node;
8530 else if (TREE_CODE (type) == FUNCTION_TYPE)
8533 tree function_context;
8537 if (ctype == NULL_TREE)
8538 ctype = current_class_type;
8540 if (ctype == NULL_TREE)
8542 error ("can't make %qD into a method -- not in a class",
8544 return error_mark_node;
8547 /* ``A union may [ ... ] not [ have ] virtual functions.''
8549 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8551 error ("function %qD declared virtual inside a union",
8553 return error_mark_node;
8556 if (NEW_DELETE_OPNAME_P (unqualified_id))
8560 error ("%qD cannot be declared virtual, since it "
8566 else if (staticp < 2)
8567 type = build_memfn_type (type, ctype, memfn_quals);
8570 /* Check that the name used for a destructor makes sense. */
8571 if (sfk == sfk_destructor)
8575 gcc_assert (friendp);
8576 error ("expected qualified name in friend declaration "
8577 "for destructor %qD",
8578 id_declarator->u.id.unqualified_name);
8579 return error_mark_node;
8582 if (!same_type_p (TREE_OPERAND
8583 (id_declarator->u.id.unqualified_name, 0),
8586 error ("declaration of %qD as member of %qT",
8587 id_declarator->u.id.unqualified_name, ctype);
8588 return error_mark_node;
8592 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8593 function_context = (ctype != NULL_TREE) ?
8594 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8595 publicp = (! friendp || ! staticp)
8596 && function_context == NULL_TREE;
8597 decl = grokfndecl (ctype, type,
8598 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8599 ? unqualified_id : dname,
8602 virtualp, flags, memfn_quals, raises,
8603 friendp ? -1 : 0, friendp, publicp, inlinep,
8605 funcdef_flag, template_count, in_namespace, attrlist);
8606 if (decl == NULL_TREE)
8607 return error_mark_node;
8609 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8610 /* The decl and setting of decl_attr is also turned off. */
8611 decl = build_decl_attribute_variant (decl, decl_attr);
8614 /* [class.conv.ctor]
8616 A constructor declared without the function-specifier
8617 explicit that can be called with a single parameter
8618 specifies a conversion from the type of its first
8619 parameter to the type of its class. Such a constructor
8620 is called a converting constructor. */
8622 DECL_NONCONVERTING_P (decl) = 1;
8623 else if (DECL_CONSTRUCTOR_P (decl))
8625 /* The constructor can be called with exactly one
8626 parameter if there is at least one parameter, and
8627 any subsequent parameters have default arguments.
8628 Ignore any compiler-added parms. */
8629 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8631 if (arg_types == void_list_node
8633 && TREE_CHAIN (arg_types)
8634 && TREE_CHAIN (arg_types) != void_list_node
8635 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8636 DECL_NONCONVERTING_P (decl) = 1;
8639 else if (TREE_CODE (type) == METHOD_TYPE)
8641 /* We only get here for friend declarations of
8642 members of other classes. */
8643 /* All method decls are public, so tell grokfndecl to set
8644 TREE_PUBLIC, also. */
8645 decl = grokfndecl (ctype, type,
8646 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8647 ? unqualified_id : dname,
8650 virtualp, flags, memfn_quals, raises,
8651 friendp ? -1 : 0, friendp, 1, 0, sfk,
8652 funcdef_flag, template_count, in_namespace,
8654 if (decl == NULL_TREE)
8655 return error_mark_node;
8657 else if (!staticp && !dependent_type_p (type)
8658 && !COMPLETE_TYPE_P (complete_type (type))
8659 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8662 error ("field %qD has incomplete type", unqualified_id);
8664 error ("name %qT has incomplete type", type);
8666 /* If we're instantiating a template, tell them which
8667 instantiation made the field's type be incomplete. */
8668 if (current_class_type
8669 && TYPE_NAME (current_class_type)
8670 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8672 && declspecs->type == type)
8673 error (" in instantiation of template %qT",
8674 current_class_type);
8676 return error_mark_node;
8682 error ("%qE is neither function nor member function; "
8683 "cannot be declared friend", unqualified_id);
8691 /* Friends are treated specially. */
8692 if (ctype == current_class_type)
8693 ; /* We already issued a pedwarn. */
8694 else if (decl && DECL_NAME (decl))
8696 if (template_class_depth (current_class_type) == 0)
8698 decl = check_explicit_specialization
8699 (unqualified_id, decl, template_count,
8700 2 * funcdef_flag + 4);
8701 if (decl == error_mark_node)
8702 return error_mark_node;
8705 decl = do_friend (ctype, unqualified_id, decl,
8711 return error_mark_node;
8714 /* Structure field. It may not be a function, except for C++. */
8716 if (decl == NULL_TREE)
8722 /* An attempt is being made to initialize a non-static
8723 member. But, from [class.mem]:
8725 4 A member-declarator can contain a
8726 constant-initializer only if it declares a static
8727 member (_class.static_) of integral or enumeration
8728 type, see _class.static.data_.
8730 This used to be relatively common practice, but
8731 the rest of the compiler does not correctly
8732 handle the initialization unless the member is
8733 static so we make it static below. */
8734 pedwarn ("ISO C++ forbids initialization of member %qD",
8736 pedwarn ("making %qD static", unqualified_id);
8740 if (uses_template_parms (type))
8741 /* We'll check at instantiation time. */
8743 else if (check_static_variable_definition (unqualified_id,
8745 /* If we just return the declaration, crashes
8746 will sometimes occur. We therefore return
8747 void_type_node, as if this was a friend
8748 declaration, to cause callers to completely
8749 ignore this declaration. */
8750 return error_mark_node;
8755 /* C++ allows static class members. All other work
8756 for this is done by grokfield. */
8757 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
8758 set_linkage_for_static_data_member (decl);
8759 /* Even if there is an in-class initialization, DECL
8760 is considered undefined until an out-of-class
8761 definition is provided. */
8762 DECL_EXTERNAL (decl) = 1;
8765 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
8769 decl = build_decl (FIELD_DECL, unqualified_id, type);
8770 DECL_NONADDRESSABLE_P (decl) = bitfield;
8771 if (bitfield && !unqualified_id)
8772 TREE_NO_WARNING (decl) = 1;
8774 if (storage_class == sc_mutable)
8776 DECL_MUTABLE_P (decl) = 1;
8777 storage_class = sc_none;
8781 bad_specifiers (decl, "field", virtualp,
8782 memfn_quals != TYPE_UNQUALIFIED,
8783 inlinep, friendp, raises != NULL_TREE);
8786 else if (TREE_CODE (type) == FUNCTION_TYPE
8787 || TREE_CODE (type) == METHOD_TYPE)
8792 if (!unqualified_id)
8793 return error_mark_node;
8795 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
8796 original_name = dname;
8798 original_name = unqualified_id;
8800 if (storage_class == sc_auto)
8801 error ("storage class %<auto%> invalid for function %qs", name);
8802 else if (storage_class == sc_register)
8803 error ("storage class %<register%> invalid for function %qs", name);
8805 error ("storage class %<__thread%> invalid for function %qs", name);
8807 /* Function declaration not at top level.
8808 Storage classes other than `extern' are not allowed
8809 and `extern' makes no difference. */
8810 if (! toplevel_bindings_p ()
8811 && (storage_class == sc_static
8812 || declspecs->specs[(int)ds_inline])
8815 if (storage_class == sc_static)
8816 pedwarn ("%<static%> specified invalid for function %qs "
8817 "declared out of global scope", name);
8819 pedwarn ("%<inline%> specifier invalid for function %qs "
8820 "declared out of global scope", name);
8823 if (ctype == NULL_TREE)
8827 error ("virtual non-class function %qs", name);
8831 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
8832 && !NEW_DELETE_OPNAME_P (original_name))
8833 type = build_method_type_directly (ctype,
8835 TYPE_ARG_TYPES (type));
8837 /* Record presence of `static'. */
8838 publicp = (ctype != NULL_TREE
8839 || storage_class == sc_extern
8840 || storage_class != sc_static);
8842 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
8843 virtualp, flags, memfn_quals, raises,
8845 publicp, inlinep, sfk, funcdef_flag,
8846 template_count, in_namespace, attrlist);
8847 if (decl == NULL_TREE)
8848 return error_mark_node;
8852 int invalid_static = 0;
8854 /* Don't allow a static member function in a class, and forbid
8855 declaring main to be static. */
8856 if (TREE_CODE (type) == METHOD_TYPE)
8858 pedwarn ("cannot declare member function %qD to have "
8859 "static linkage", decl);
8862 else if (current_function_decl)
8864 /* FIXME need arm citation */
8865 error ("cannot declare static function inside another function");
8872 storage_class = sc_none;
8878 /* It's a variable. */
8880 /* An uninitialized decl with `extern' is a reference. */
8881 decl = grokvardecl (type, unqualified_id,
8884 (type_quals & TYPE_QUAL_CONST) != 0,
8885 ctype ? ctype : in_namespace);
8886 bad_specifiers (decl, "variable", virtualp,
8887 memfn_quals != TYPE_UNQUALIFIED,
8888 inlinep, friendp, raises != NULL_TREE);
8892 DECL_CONTEXT (decl) = ctype;
8895 pedwarn ("%<static%> may not be used when defining "
8896 "(as opposed to declaring) a static data member");
8898 storage_class = sc_none;
8900 if (storage_class == sc_register && TREE_STATIC (decl))
8902 error ("static member %qD declared %<register%>", decl);
8903 storage_class = sc_none;
8905 if (storage_class == sc_extern && pedantic)
8907 pedwarn ("cannot explicitly declare member %q#D to have "
8910 storage_class = sc_none;
8915 /* Record `register' declaration for warnings on &
8916 and in case doing stupid register allocation. */
8918 if (storage_class == sc_register)
8919 DECL_REGISTER (decl) = 1;
8920 else if (storage_class == sc_extern)
8921 DECL_THIS_EXTERN (decl) = 1;
8922 else if (storage_class == sc_static)
8923 DECL_THIS_STATIC (decl) = 1;
8925 /* Record constancy and volatility. There's no need to do this
8926 when processing a template; we'll do this for the instantiated
8927 declaration based on the type of DECL. */
8928 if (!processing_template_decl)
8929 cp_apply_type_quals_to_decl (type_quals, decl);
8932 TREE_NO_WARNING (decl) = 1;
8938 /* Subroutine of start_function. Ensure that each of the parameter
8939 types (as listed in PARMS) is complete, as is required for a
8940 function definition. */
8943 require_complete_types_for_parms (tree parms)
8945 for (; parms; parms = TREE_CHAIN (parms))
8947 if (dependent_type_p (TREE_TYPE (parms)))
8949 if (!VOID_TYPE_P (TREE_TYPE (parms))
8950 && complete_type_or_else (TREE_TYPE (parms), parms))
8952 relayout_decl (parms);
8953 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
8956 /* grokparms or complete_type_or_else will have already issued
8958 TREE_TYPE (parms) = error_mark_node;
8962 /* Returns nonzero if T is a local variable. */
8965 local_variable_p (const_tree t)
8967 if ((TREE_CODE (t) == VAR_DECL
8968 /* A VAR_DECL with a context that is a _TYPE is a static data
8970 && !TYPE_P (CP_DECL_CONTEXT (t))
8971 /* Any other non-local variable must be at namespace scope. */
8972 && !DECL_NAMESPACE_SCOPE_P (t))
8973 || (TREE_CODE (t) == PARM_DECL))
8979 /* Like local_variable_p, but suitable for use as a tree-walking
8983 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
8984 void *data ATTRIBUTE_UNUSED)
8986 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
8988 else if (TYPE_P (*tp))
8995 /* Check that ARG, which is a default-argument expression for a
8996 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
8997 something goes wrong. DECL may also be a _TYPE node, rather than a
8998 DECL, if there is no DECL available. */
9001 check_default_argument (tree decl, tree arg)
9006 if (TREE_CODE (arg) == DEFAULT_ARG)
9007 /* We get a DEFAULT_ARG when looking at an in-class declaration
9008 with a default argument. Ignore the argument for now; we'll
9009 deal with it after the class is complete. */
9018 decl_type = TREE_TYPE (decl);
9020 if (arg == error_mark_node
9021 || decl == error_mark_node
9022 || TREE_TYPE (arg) == error_mark_node
9023 || decl_type == error_mark_node)
9024 /* Something already went wrong. There's no need to check
9026 return error_mark_node;
9028 /* [dcl.fct.default]
9030 A default argument expression is implicitly converted to the
9032 if (!TREE_TYPE (arg)
9033 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9036 error ("default argument for %q#D has type %qT",
9037 decl, TREE_TYPE (arg));
9039 error ("default argument for parameter of type %qT has type %qT",
9040 decl_type, TREE_TYPE (arg));
9042 return error_mark_node;
9045 /* [dcl.fct.default]
9047 Local variables shall not be used in default argument
9050 The keyword `this' shall not be used in a default argument of a
9052 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9055 error ("default argument %qE uses local variable %qD", arg, var);
9056 return error_mark_node;
9063 /* Decode the list of parameter types for a function type.
9064 Given the list of things declared inside the parens,
9065 return a list of types.
9067 If this parameter does not end with an ellipsis, we append
9070 *PARMS is set to the chain of PARM_DECLs created. */
9073 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9075 tree result = NULL_TREE;
9076 tree decls = NULL_TREE;
9077 int ellipsis = !first_parm || first_parm->ellipsis_p;
9078 cp_parameter_declarator *parm;
9080 struct pointer_set_t *unique_decls = pointer_set_create ();
9082 for (parm = first_parm; parm != NULL; parm = parm->next)
9084 tree type = NULL_TREE;
9085 tree init = parm->default_argument;
9089 if (parm == no_parameters)
9092 attrs = parm->decl_specifiers.attributes;
9093 parm->decl_specifiers.attributes = NULL_TREE;
9094 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9095 PARM, init != NULL_TREE, &attrs);
9096 if (! decl || TREE_TYPE (decl) == error_mark_node)
9100 cplus_decl_attributes (&decl, attrs, 0);
9102 type = TREE_TYPE (decl);
9103 if (VOID_TYPE_P (type))
9105 if (same_type_p (type, void_type_node)
9106 && DECL_SELF_REFERENCE_P (type)
9107 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9108 /* this is a parmlist of `(void)', which is ok. */
9110 cxx_incomplete_type_error (decl, type);
9111 /* It's not a good idea to actually create parameters of
9112 type `void'; other parts of the compiler assume that a
9113 void type terminates the parameter list. */
9114 type = error_mark_node;
9115 TREE_TYPE (decl) = error_mark_node;
9118 if (type != error_mark_node)
9120 /* Top-level qualifiers on the parameters are
9121 ignored for function types. */
9122 type = cp_build_qualified_type (type, 0);
9123 if (TREE_CODE (type) == METHOD_TYPE)
9125 error ("parameter %qD invalidly declared method type", decl);
9126 type = build_pointer_type (type);
9127 TREE_TYPE (decl) = type;
9129 else if (abstract_virtuals_error (decl, type))
9130 any_error = 1; /* Seems like a good idea. */
9131 else if (POINTER_TYPE_P (type))
9133 /* [dcl.fct]/6, parameter types cannot contain pointers
9134 (references) to arrays of unknown bound. */
9135 tree t = TREE_TYPE (type);
9136 int ptr = TYPE_PTR_P (type);
9142 else if (TREE_CODE (t) != ARRAY_TYPE)
9144 else if (!TYPE_DOMAIN (t))
9148 if (TREE_CODE (t) == ARRAY_TYPE)
9149 error ("parameter %qD includes %s to array of unknown "
9151 decl, ptr ? "pointer" : "reference", t);
9156 else if (init && !processing_template_decl)
9157 init = check_default_argument (decl, init);
9160 if (TREE_CODE (decl) == PARM_DECL
9161 && FUNCTION_PARAMETER_PACK_P (decl)
9163 error ("parameter packs must be at the end of the parameter list");
9165 if (DECL_NAME (decl))
9167 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9168 error ("multiple parameters named %qE", DECL_NAME (decl));
9170 pointer_set_insert (unique_decls, DECL_NAME (decl));
9173 TREE_CHAIN (decl) = decls;
9175 result = tree_cons (init, type, result);
9177 decls = nreverse (decls);
9178 result = nreverse (result);
9180 result = chainon (result, void_list_node);
9183 pointer_set_destroy (unique_decls);
9188 /* D is a constructor or overloaded `operator='.
9190 Let T be the class in which D is declared. Then, this function
9193 -1 if D's is an ill-formed constructor or copy assignment operator
9194 whose first parameter is of type `T'.
9195 0 if D is not a copy constructor or copy assignment
9197 1 if D is a copy constructor or copy assignment operator whose
9198 first parameter is a reference to const qualified T.
9199 2 if D is a copy constructor or copy assignment operator whose
9200 first parameter is a reference to non-const qualified T.
9202 This function can be used as a predicate. Positive values indicate
9203 a copy constructor and nonzero values indicate a copy assignment
9213 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9215 if (TREE_CODE (d) == TEMPLATE_DECL
9216 || (DECL_TEMPLATE_INFO (d)
9217 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9218 /* Instantiations of template member functions are never copy
9219 functions. Note that member functions of templated classes are
9220 represented as template functions internally, and we must
9221 accept those as copy functions. */
9224 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9228 arg_type = TREE_VALUE (args);
9229 if (arg_type == error_mark_node)
9232 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9234 /* Pass by value copy assignment operator. */
9237 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9238 && !TYPE_REF_IS_RVALUE (arg_type)
9239 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9241 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9247 args = TREE_CHAIN (args);
9249 if (args && args != void_list_node && !TREE_PURPOSE (args))
9250 /* There are more non-optional args. */
9256 /* D is a constructor or overloaded `operator='.
9258 Let T be the class in which D is declared. Then, this function
9259 returns true when D is a move constructor or move assignment
9260 operator, false otherwise. */
9267 bool result = false;
9269 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9271 if (cxx_dialect == cxx98)
9272 /* There are no move constructors if we are in C++98 mode. */
9275 if (TREE_CODE (d) == TEMPLATE_DECL
9276 || (DECL_TEMPLATE_INFO (d)
9277 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9278 /* Instantiations of template member functions are never copy
9279 functions. Note that member functions of templated classes are
9280 represented as template functions internally, and we must
9281 accept those as copy functions. */
9284 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9288 arg_type = TREE_VALUE (args);
9289 if (arg_type == error_mark_node)
9292 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9293 && TYPE_REF_IS_RVALUE (arg_type)
9294 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9298 args = TREE_CHAIN (args);
9300 if (args && args != void_list_node && !TREE_PURPOSE (args))
9301 /* There are more non-optional args. */
9307 /* Remember any special properties of member function DECL. */
9309 void grok_special_member_properties (tree decl)
9313 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9316 class_type = DECL_CONTEXT (decl);
9317 if (DECL_CONSTRUCTOR_P (decl))
9319 int ctor = copy_fn_p (decl);
9321 TYPE_HAS_CONSTRUCTOR (class_type) = 1;
9327 A non-template constructor for class X is a copy
9328 constructor if its first parameter is of type X&, const
9329 X&, volatile X& or const volatile X&, and either there
9330 are no other parameters or else all other parameters have
9331 default arguments. */
9332 TYPE_HAS_INIT_REF (class_type) = 1;
9334 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9336 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9337 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9339 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9343 A non-template assignment operator for class X is a copy
9344 assignment operator if its parameter is of type X, X&, const
9345 X&, volatile X& or const volatile X&. */
9347 int assop = copy_fn_p (decl);
9351 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9353 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9358 /* Check a constructor DECL has the correct form. Complains
9359 if the class has a constructor of the form X(X). */
9362 grok_ctor_properties (tree ctype, tree decl)
9364 int ctor_parm = copy_fn_p (decl);
9370 A declaration of a constructor for a class X is ill-formed if
9371 its first parameter is of type (optionally cv-qualified) X
9372 and either there are no other parameters or else all other
9373 parameters have default arguments.
9375 We *don't* complain about member template instantiations that
9376 have this form, though; they can occur as we try to decide
9377 what constructor to use during overload resolution. Since
9378 overload resolution will never prefer such a constructor to
9379 the non-template copy constructor (which is either explicitly
9380 or implicitly defined), there's no need to worry about their
9381 existence. Theoretically, they should never even be
9382 instantiated, but that's hard to forestall. */
9383 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9391 /* An operator with this code is unary, but can also be binary. */
9394 ambi_op_p (enum tree_code code)
9396 return (code == INDIRECT_REF
9397 || code == ADDR_EXPR
9398 || code == UNARY_PLUS_EXPR
9399 || code == NEGATE_EXPR
9400 || code == PREINCREMENT_EXPR
9401 || code == PREDECREMENT_EXPR);
9404 /* An operator with this name can only be unary. */
9407 unary_op_p (enum tree_code code)
9409 return (code == TRUTH_NOT_EXPR
9410 || code == BIT_NOT_EXPR
9411 || code == COMPONENT_REF
9412 || code == TYPE_EXPR);
9415 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9416 errors are issued for invalid declarations. */
9419 grok_op_properties (tree decl, bool complain)
9421 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9423 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9424 tree name = DECL_NAME (decl);
9425 enum tree_code operator_code;
9430 /* Count the number of arguments and check for ellipsis. */
9431 for (argtype = argtypes, arity = 0;
9432 argtype && argtype != void_list_node;
9433 argtype = TREE_CHAIN (argtype))
9435 ellipsis_p = !argtype;
9437 class_type = DECL_CONTEXT (decl);
9438 if (class_type && !CLASS_TYPE_P (class_type))
9439 class_type = NULL_TREE;
9441 if (DECL_CONV_FN_P (decl))
9442 operator_code = TYPE_EXPR;
9446 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9447 if (ansi_opname (CODE) == name) \
9449 operator_code = (CODE); \
9452 else if (ansi_assopname (CODE) == name) \
9454 operator_code = (CODE); \
9455 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9459 #include "operators.def"
9465 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9466 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9469 switch (operator_code)
9472 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9476 TYPE_GETS_DELETE (class_type) |= 1;
9480 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9483 case VEC_DELETE_EXPR:
9484 TYPE_GETS_DELETE (class_type) |= 2;
9491 /* [basic.std.dynamic.allocation]/1:
9493 A program is ill-formed if an allocation function is declared
9494 in a namespace scope other than global scope or declared static
9497 The same also holds true for deallocation functions. */
9498 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9499 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9501 if (DECL_NAMESPACE_SCOPE_P (decl))
9503 if (CP_DECL_CONTEXT (decl) != global_namespace)
9505 error ("%qD may not be declared within a namespace", decl);
9508 else if (!TREE_PUBLIC (decl))
9510 error ("%qD may not be declared as static", decl);
9516 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9517 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9518 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9519 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9522 /* An operator function must either be a non-static member function
9523 or have at least one parameter of a class, a reference to a class,
9524 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9525 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9527 if (operator_code == TYPE_EXPR
9528 || operator_code == CALL_EXPR
9529 || operator_code == COMPONENT_REF
9530 || operator_code == ARRAY_REF
9531 || operator_code == NOP_EXPR)
9533 error ("%qD must be a nonstatic member function", decl);
9540 if (DECL_STATIC_FUNCTION_P (decl))
9542 error ("%qD must be either a non-static member "
9543 "function or a non-member function", decl);
9547 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9549 tree arg = non_reference (TREE_VALUE (p));
9550 if (arg == error_mark_node)
9553 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9554 because these checks are performed even on
9555 template functions. */
9556 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9560 if (!p || p == void_list_node)
9563 error ("%qD must have an argument of class or "
9564 "enumerated type", decl);
9570 /* There are no restrictions on the arguments to an overloaded
9572 if (operator_code == CALL_EXPR)
9575 /* Warn about conversion operators that will never be used. */
9576 if (IDENTIFIER_TYPENAME_P (name)
9577 && ! DECL_TEMPLATE_INFO (decl)
9579 /* Warn only declaring the function; there is no need to
9580 warn again about out-of-class definitions. */
9581 && class_type == current_class_type)
9583 tree t = TREE_TYPE (name);
9584 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9585 const char *what = 0;
9588 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9590 if (TREE_CODE (t) == VOID_TYPE)
9592 else if (class_type)
9594 if (t == class_type)
9595 what = "the same type";
9596 /* Don't force t to be complete here. */
9597 else if (IS_AGGR_TYPE (t)
9598 && COMPLETE_TYPE_P (t)
9599 && DERIVED_FROM_P (t, class_type))
9600 what = "a base class";
9604 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9605 "conversion operator",
9606 ref ? "a reference to " : "", what);
9609 if (operator_code == COND_EXPR)
9612 error ("ISO C++ prohibits overloading operator ?:");
9615 else if (ellipsis_p)
9617 error ("%qD must not have variable number of arguments", decl);
9620 else if (ambi_op_p (operator_code))
9623 /* We pick the one-argument operator codes by default, so
9624 we don't have to change anything. */
9626 else if (arity == 2)
9628 /* If we thought this was a unary operator, we now know
9629 it to be a binary operator. */
9630 switch (operator_code)
9633 operator_code = MULT_EXPR;
9637 operator_code = BIT_AND_EXPR;
9640 case UNARY_PLUS_EXPR:
9641 operator_code = PLUS_EXPR;
9645 operator_code = MINUS_EXPR;
9648 case PREINCREMENT_EXPR:
9649 operator_code = POSTINCREMENT_EXPR;
9652 case PREDECREMENT_EXPR:
9653 operator_code = POSTDECREMENT_EXPR;
9660 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9662 if ((operator_code == POSTINCREMENT_EXPR
9663 || operator_code == POSTDECREMENT_EXPR)
9664 && ! processing_template_decl
9665 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9668 error ("postfix %qD must take %<int%> as its argument",
9671 error ("postfix %qD must take %<int%> as its second "
9679 error ("%qD must take either zero or one argument", decl);
9681 error ("%qD must take either one or two arguments", decl);
9685 /* More Effective C++ rule 6. */
9687 && (operator_code == POSTINCREMENT_EXPR
9688 || operator_code == POSTDECREMENT_EXPR
9689 || operator_code == PREINCREMENT_EXPR
9690 || operator_code == PREDECREMENT_EXPR))
9692 tree arg = TREE_VALUE (argtypes);
9693 tree ret = TREE_TYPE (TREE_TYPE (decl));
9694 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9695 arg = TREE_TYPE (arg);
9696 arg = TYPE_MAIN_VARIANT (arg);
9697 if (operator_code == PREINCREMENT_EXPR
9698 || operator_code == PREDECREMENT_EXPR)
9700 if (TREE_CODE (ret) != REFERENCE_TYPE
9701 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9703 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9704 build_reference_type (arg));
9708 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9709 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
9713 else if (unary_op_p (operator_code))
9718 error ("%qD must take %<void%>", decl);
9720 error ("%qD must take exactly one argument", decl);
9724 else /* if (binary_op_p (operator_code)) */
9729 error ("%qD must take exactly one argument", decl);
9731 error ("%qD must take exactly two arguments", decl);
9735 /* More Effective C++ rule 7. */
9737 && (operator_code == TRUTH_ANDIF_EXPR
9738 || operator_code == TRUTH_ORIF_EXPR
9739 || operator_code == COMPOUND_EXPR))
9740 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
9744 /* Effective C++ rule 23. */
9747 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
9748 && (operator_code == PLUS_EXPR
9749 || operator_code == MINUS_EXPR
9750 || operator_code == TRUNC_DIV_EXPR
9751 || operator_code == MULT_EXPR
9752 || operator_code == TRUNC_MOD_EXPR)
9753 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
9754 warning (OPT_Weffc__, "%qD should return by value", decl);
9757 for (; argtypes && argtypes != void_list_node;
9758 argtypes = TREE_CHAIN (argtypes))
9759 if (TREE_PURPOSE (argtypes))
9761 TREE_PURPOSE (argtypes) = NULL_TREE;
9762 if (operator_code == POSTINCREMENT_EXPR
9763 || operator_code == POSTDECREMENT_EXPR)
9766 pedwarn ("%qD cannot have default arguments", decl);
9770 error ("%qD cannot have default arguments", decl);
9778 /* Return a string giving the keyword associate with CODE. */
9781 tag_name (enum tag_types code)
9800 /* Name lookup in an elaborated-type-specifier (after the keyword
9801 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
9802 elaborated-type-specifier is invalid, issue a diagnostic and return
9803 error_mark_node; otherwise, return the *_TYPE to which it referred.
9804 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
9807 check_elaborated_type_specifier (enum tag_types tag_code,
9809 bool allow_template_p)
9815 struct S { struct S *p; };
9817 name lookup will find the TYPE_DECL for the implicit "S::S"
9818 typedef. Adjust for that here. */
9819 if (DECL_SELF_REFERENCE_P (decl))
9820 decl = TYPE_NAME (TREE_TYPE (decl));
9822 type = TREE_TYPE (decl);
9824 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
9825 is false for this case as well. */
9826 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9828 error ("using template type parameter %qT after %qs",
9829 type, tag_name (tag_code));
9830 return error_mark_node;
9834 If the identifier resolves to a typedef-name or a template
9835 type-parameter, the elaborated-type-specifier is ill-formed.
9837 In other words, the only legitimate declaration to use in the
9838 elaborated type specifier is the implicit typedef created when
9839 the type is declared. */
9840 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
9841 && tag_code != typename_type)
9843 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
9844 error ("%q+D has a previous declaration here", decl);
9845 return error_mark_node;
9847 else if (TREE_CODE (type) != RECORD_TYPE
9848 && TREE_CODE (type) != UNION_TYPE
9849 && tag_code != enum_type
9850 && tag_code != typename_type)
9852 error ("%qT referred to as %qs", type, tag_name (tag_code));
9853 error ("%q+T has a previous declaration here", type);
9854 return error_mark_node;
9856 else if (TREE_CODE (type) != ENUMERAL_TYPE
9857 && tag_code == enum_type)
9859 error ("%qT referred to as enum", type);
9860 error ("%q+T has a previous declaration here", type);
9861 return error_mark_node;
9863 else if (!allow_template_p
9864 && TREE_CODE (type) == RECORD_TYPE
9865 && CLASSTYPE_IS_TEMPLATE (type))
9867 /* If a class template appears as elaborated type specifier
9868 without a template header such as:
9870 template <class T> class C {};
9871 void f(class C); // No template header here
9873 then the required template argument is missing. */
9874 error ("template argument required for %<%s %T%>",
9875 tag_name (tag_code),
9876 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
9877 return error_mark_node;
9883 /* Lookup NAME in elaborate type specifier in scope according to
9884 SCOPE and issue diagnostics if necessary.
9885 Return *_TYPE node upon success, NULL_TREE when the NAME is not
9886 found, and ERROR_MARK_NODE for type error. */
9889 lookup_and_check_tag (enum tag_types tag_code, tree name,
9890 tag_scope scope, bool template_header_p)
9894 if (scope == ts_global)
9896 /* First try ordinary name lookup, ignoring hidden class name
9897 injected via friend declaration. */
9898 decl = lookup_name_prefer_type (name, 2);
9899 /* If that fails, the name will be placed in the smallest
9900 non-class, non-function-prototype scope according to 3.3.1/5.
9901 We may already have a hidden name declared as friend in this
9902 scope. So lookup again but not ignoring hidden names.
9903 If we find one, that name will be made visible rather than
9904 creating a new tag. */
9906 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
9909 decl = lookup_type_scope (name, scope);
9911 if (decl && DECL_CLASS_TEMPLATE_P (decl))
9912 decl = DECL_TEMPLATE_RESULT (decl);
9914 if (decl && TREE_CODE (decl) == TYPE_DECL)
9916 /* Look for invalid nested type:
9920 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
9922 error ("%qD has the same name as the class in which it is "
9925 return error_mark_node;
9928 /* Two cases we need to consider when deciding if a class
9929 template is allowed as an elaborated type specifier:
9930 1. It is a self reference to its own class.
9931 2. It comes with a template header.
9935 template <class T> class C {
9936 class C *c1; // DECL_SELF_REFERENCE_P is true
9939 template <class U> class C; // template_header_p is true
9940 template <class T> class C<T>::D {
9941 class C *c2; // DECL_SELF_REFERENCE_P is true
9944 t = check_elaborated_type_specifier (tag_code,
9947 | DECL_SELF_REFERENCE_P (decl));
9950 else if (decl && TREE_CODE (decl) == TREE_LIST)
9952 error ("reference to %qD is ambiguous", name);
9953 print_candidates (decl);
9954 return error_mark_node;
9960 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
9961 Define the tag as a forward-reference if it is not defined.
9963 If a declaration is given, process it here, and report an error if
9964 multiple declarations are not identical.
9966 SCOPE is TS_CURRENT when this is also a definition. Only look in
9967 the current frame for the name (since C++ allows new names in any
9968 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
9969 declaration. Only look beginning from the current scope outward up
9970 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
9972 TEMPLATE_HEADER_P is true when this declaration is preceded by
9973 a set of template parameters. */
9976 xref_tag (enum tag_types tag_code, tree name,
9977 tag_scope scope, bool template_header_p)
9979 enum tree_code code;
9981 tree context = NULL_TREE;
9983 timevar_push (TV_NAME_LOOKUP);
9985 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
9997 code = ENUMERAL_TYPE;
10000 gcc_unreachable ();
10003 /* In case of anonymous name, xref_tag is only called to
10004 make type node and push name. Name lookup is not required. */
10005 if (ANON_AGGRNAME_P (name))
10008 t = lookup_and_check_tag (tag_code, name,
10009 scope, template_header_p);
10011 if (t == error_mark_node)
10012 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10014 if (scope != ts_current && t && current_class_type
10015 && template_class_depth (current_class_type)
10016 && template_header_p)
10018 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10019 definition of this tag. Since, in addition, we are currently
10020 processing a (member) template declaration of a template
10021 class, we must be very careful; consider:
10028 { template <class V>
10029 friend struct S1; };
10031 Here, the S2::S1 declaration should not be confused with the
10032 outer declaration. In particular, the inner version should
10033 have a template parameter of level 2, not level 1. This
10034 would be particularly important if the member declaration
10037 template <class V = U> friend struct S1;
10039 say, when we should tsubst into `U' when instantiating
10040 S2. On the other hand, when presented with:
10050 we must find the inner binding eventually. We
10051 accomplish this by making sure that the new type we
10052 create to represent this declaration has the right
10054 context = TYPE_CONTEXT (t);
10060 /* If no such tag is yet defined, create a forward-reference node
10061 and record it as the "definition".
10062 When a real declaration of this type is found,
10063 the forward-reference will be altered into a real type. */
10064 if (code == ENUMERAL_TYPE)
10066 error ("use of enum %q#D without previous declaration", name);
10067 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10071 t = make_aggr_type (code);
10072 TYPE_CONTEXT (t) = context;
10073 t = pushtag (name, t, scope);
10078 if (template_header_p && IS_AGGR_TYPE (t))
10080 if (!redeclare_class_template (t, current_template_parms))
10081 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10083 else if (!processing_template_decl
10084 && CLASS_TYPE_P (t)
10085 && CLASSTYPE_IS_TEMPLATE (t))
10087 error ("redeclaration of %qT as a non-template", t);
10088 error ("previous declaration %q+D", t);
10089 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10092 /* Make injected friend class visible. */
10093 if (scope != ts_within_enclosing_non_class
10094 && hidden_name_p (TYPE_NAME (t)))
10096 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10097 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10099 if (TYPE_TEMPLATE_INFO (t))
10101 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10102 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10107 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10111 xref_tag_from_type (tree old, tree id, tag_scope scope)
10113 enum tag_types tag_kind;
10115 if (TREE_CODE (old) == RECORD_TYPE)
10116 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10118 tag_kind = union_type;
10120 if (id == NULL_TREE)
10121 id = TYPE_IDENTIFIER (old);
10123 return xref_tag (tag_kind, id, scope, false);
10126 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10127 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10128 access_* node, and the TREE_VALUE is the type of the base-class.
10129 Non-NULL TREE_TYPE indicates virtual inheritance.
10131 Returns true if the binfo hierarchy was successfully created,
10132 false if an error was detected. */
10135 xref_basetypes (tree ref, tree base_list)
10138 tree binfo, base_binfo;
10139 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10140 unsigned max_bases = 0; /* Maximum direct bases. */
10142 tree default_access;
10143 tree igo_prev; /* Track Inheritance Graph Order. */
10145 if (ref == error_mark_node)
10148 /* The base of a derived class is private by default, all others are
10150 default_access = (TREE_CODE (ref) == RECORD_TYPE
10151 && CLASSTYPE_DECLARED_CLASS (ref)
10152 ? access_private_node : access_public_node);
10154 /* First, make sure that any templates in base-classes are
10155 instantiated. This ensures that if we call ourselves recursively
10156 we do not get confused about which classes are marked and which
10158 basep = &base_list;
10161 tree basetype = TREE_VALUE (*basep);
10163 if (!(processing_template_decl && uses_template_parms (basetype))
10164 && !complete_type_or_else (basetype, NULL))
10165 /* An incomplete type. Remove it from the list. */
10166 *basep = TREE_CHAIN (*basep);
10170 if (TREE_TYPE (*basep))
10172 if (CLASS_TYPE_P (basetype))
10173 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10174 basep = &TREE_CHAIN (*basep);
10178 TYPE_MARKED_P (ref) = 1;
10180 /* The binfo slot should be empty, unless this is an (ill-formed)
10182 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10183 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10185 binfo = make_tree_binfo (max_bases);
10187 TYPE_BINFO (ref) = binfo;
10188 BINFO_OFFSET (binfo) = size_zero_node;
10189 BINFO_TYPE (binfo) = ref;
10193 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10194 /* An aggregate cannot have baseclasses. */
10195 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10197 if (TREE_CODE (ref) == UNION_TYPE)
10199 error ("derived union %qT invalid", ref);
10206 if (TYPE_FOR_JAVA (ref))
10208 error ("Java class %qT cannot have multiple bases", ref);
10215 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10217 if (TYPE_FOR_JAVA (ref))
10219 error ("Java class %qT cannot have virtual bases", ref);
10224 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10226 tree access = TREE_PURPOSE (base_list);
10227 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10228 tree basetype = TREE_VALUE (base_list);
10230 if (access == access_default_node)
10231 access = default_access;
10233 if (PACK_EXPANSION_P (basetype))
10234 basetype = PACK_EXPANSION_PATTERN (basetype);
10235 if (TREE_CODE (basetype) == TYPE_DECL)
10236 basetype = TREE_TYPE (basetype);
10237 if (TREE_CODE (basetype) != RECORD_TYPE
10238 && TREE_CODE (basetype) != TYPENAME_TYPE
10239 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10240 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10242 error ("base type %qT fails to be a struct or class type",
10247 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10248 TYPE_FOR_JAVA (ref) = 1;
10250 base_binfo = NULL_TREE;
10251 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10253 base_binfo = TYPE_BINFO (basetype);
10254 /* The original basetype could have been a typedef'd type. */
10255 basetype = BINFO_TYPE (base_binfo);
10257 /* Inherit flags from the base. */
10258 TYPE_HAS_NEW_OPERATOR (ref)
10259 |= TYPE_HAS_NEW_OPERATOR (basetype);
10260 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10261 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10262 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10263 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10264 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10265 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10266 CLASSTYPE_REPEATED_BASE_P (ref)
10267 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10270 /* We must do this test after we've seen through a typedef
10272 if (TYPE_MARKED_P (basetype))
10274 if (basetype == ref)
10275 error ("recursive type %qT undefined", basetype);
10277 error ("duplicate base type %qT invalid", basetype);
10281 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10282 /* Regenerate the pack expansion for the bases. */
10283 basetype = make_pack_expansion (basetype);
10285 TYPE_MARKED_P (basetype) = 1;
10287 base_binfo = copy_binfo (base_binfo, basetype, ref,
10288 &igo_prev, via_virtual);
10289 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10290 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10292 BINFO_BASE_APPEND (binfo, base_binfo);
10293 BINFO_BASE_ACCESS_APPEND (binfo, access);
10296 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10297 /* If we have space in the vbase vector, we must have shared at
10298 least one of them, and are therefore diamond shaped. */
10299 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10301 /* Unmark all the types. */
10302 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10303 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10304 TYPE_MARKED_P (ref) = 0;
10306 /* Now see if we have a repeated base type. */
10307 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10309 for (base_binfo = binfo; base_binfo;
10310 base_binfo = TREE_CHAIN (base_binfo))
10312 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10314 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10317 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10319 for (base_binfo = binfo; base_binfo;
10320 base_binfo = TREE_CHAIN (base_binfo))
10321 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10322 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10331 /* Begin compiling the definition of an enumeration type.
10333 Returns the type object, as yet incomplete.
10334 Also records info about it so that build_enumerator
10335 may be used to declare the individual values as they are read. */
10338 start_enum (tree name)
10342 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10344 /* If this is the real definition for a previous forward reference,
10345 fill in the contents in the same object that used to be the
10346 forward reference. */
10348 enumtype = lookup_and_check_tag (enum_type, name,
10349 /*tag_scope=*/ts_current,
10350 /*template_header_p=*/false);
10352 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10354 error ("multiple definition of %q#T", enumtype);
10355 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10356 /* Clear out TYPE_VALUES, and start again. */
10357 TYPE_VALUES (enumtype) = NULL_TREE;
10361 /* In case of error, make a dummy enum to allow parsing to
10363 if (enumtype == error_mark_node)
10364 name = make_anon_name ();
10366 enumtype = make_node (ENUMERAL_TYPE);
10367 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10373 /* After processing and defining all the values of an enumeration type,
10374 install their decls in the enumeration type and finish it off.
10375 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10378 finish_enum (tree enumtype)
10387 bool use_short_enum;
10391 integer_type_kind itk;
10392 tree underlying_type = NULL_TREE;
10394 /* We built up the VALUES in reverse order. */
10395 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10397 /* For an enum defined in a template, just set the type of the values;
10398 all further processing is postponed until the template is
10399 instantiated. We need to set the type so that tsubst of a CONST_DECL
10401 if (processing_template_decl)
10403 for (values = TYPE_VALUES (enumtype);
10405 values = TREE_CHAIN (values))
10406 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10407 if (at_function_scope_p ())
10408 add_stmt (build_min (TAG_DEFN, enumtype));
10412 /* Determine the minimum and maximum values of the enumerators. */
10413 if (TYPE_VALUES (enumtype))
10415 minnode = maxnode = NULL_TREE;
10417 for (values = TYPE_VALUES (enumtype);
10419 values = TREE_CHAIN (values))
10421 decl = TREE_VALUE (values);
10423 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10424 each enumerator has the type of its enumeration. Prior to the
10425 closing brace, the type of each enumerator is the type of its
10426 initializing value. */
10427 TREE_TYPE (decl) = enumtype;
10429 /* Update the minimum and maximum values, if appropriate. */
10430 value = DECL_INITIAL (decl);
10431 if (value == error_mark_node)
10432 value = integer_zero_node;
10433 /* Figure out what the minimum and maximum values of the
10434 enumerators are. */
10436 minnode = maxnode = value;
10437 else if (tree_int_cst_lt (maxnode, value))
10439 else if (tree_int_cst_lt (value, minnode))
10446 If the enumerator-list is empty, the underlying type is as if
10447 the enumeration had a single enumerator with value 0. */
10448 minnode = maxnode = integer_zero_node;
10450 /* Compute the number of bits require to represent all values of the
10451 enumeration. We must do this before the type of MINNODE and
10452 MAXNODE are transformed, since min_precision relies on the
10453 TREE_TYPE of the value it is passed. */
10454 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10455 lowprec = min_precision (minnode, unsignedp);
10456 highprec = min_precision (maxnode, unsignedp);
10457 precision = MAX (lowprec, highprec);
10459 /* Determine the underlying type of the enumeration.
10463 The underlying type of an enumeration is an integral type that
10464 can represent all the enumerator values defined in the
10465 enumeration. It is implementation-defined which integral type is
10466 used as the underlying type for an enumeration except that the
10467 underlying type shall not be larger than int unless the value of
10468 an enumerator cannot fit in an int or unsigned int.
10470 We use "int" or an "unsigned int" as the underlying type, even if
10471 a smaller integral type would work, unless the user has
10472 explicitly requested that we use the smallest possible type. The
10473 user can request that for all enumerations with a command line
10474 flag, or for just one enumeration with an attribute. */
10476 use_short_enum = flag_short_enums
10477 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10479 for (itk = (use_short_enum ? itk_char : itk_int);
10483 underlying_type = integer_types[itk];
10484 if (TYPE_PRECISION (underlying_type) >= precision
10485 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10488 if (itk == itk_none)
10492 IF no integral type can represent all the enumerator values, the
10493 enumeration is ill-formed. */
10494 error ("no integral type can represent all of the enumerator values "
10495 "for %qT", enumtype);
10496 precision = TYPE_PRECISION (long_long_integer_type_node);
10497 underlying_type = integer_types[itk_unsigned_long_long];
10500 /* Compute the minium and maximum values for the type.
10504 For an enumeration where emin is the smallest enumerator and emax
10505 is the largest, the values of the enumeration are the values of the
10506 underlying type in the range bmin to bmax, where bmin and bmax are,
10507 respectively, the smallest and largest values of the smallest bit-
10508 field that can store emin and emax. */
10510 /* The middle-end currently assumes that types with TYPE_PRECISION
10511 narrower than their underlying type are suitably zero or sign
10512 extended to fill their mode. g++ doesn't make these guarantees.
10513 Until the middle-end can represent such paradoxical types, we
10514 set the TYPE_PRECISION to the width of the underlying type. */
10515 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10517 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10521 The value of sizeof() applied to an enumeration type, an object
10522 of an enumeration type, or an enumerator, is the value of sizeof()
10523 applied to the underlying type. */
10524 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10525 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10526 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10527 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10528 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10529 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10531 /* Convert each of the enumerators to the type of the underlying
10532 type of the enumeration. */
10533 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10535 location_t saved_location;
10537 decl = TREE_VALUE (values);
10538 saved_location = input_location;
10539 input_location = DECL_SOURCE_LOCATION (decl);
10540 value = perform_implicit_conversion (underlying_type,
10541 DECL_INITIAL (decl));
10542 input_location = saved_location;
10544 /* Do not clobber shared ints. */
10545 value = copy_node (value);
10547 TREE_TYPE (value) = enumtype;
10548 DECL_INITIAL (decl) = value;
10549 TREE_VALUE (values) = value;
10552 /* Fix up all variant types of this enum type. */
10553 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10555 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10556 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10557 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10558 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10559 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10560 TYPE_MODE (t) = TYPE_MODE (enumtype);
10561 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10562 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10563 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10564 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10567 /* Finish debugging output for this type. */
10568 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10571 /* Build and install a CONST_DECL for an enumeration constant of the
10572 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10573 Assignment of sequential values by default is handled here. */
10576 build_enumerator (tree name, tree value, tree enumtype)
10582 /* If the VALUE was erroneous, pretend it wasn't there; that will
10583 result in the enum being assigned the next value in sequence. */
10584 if (value == error_mark_node)
10587 /* Remove no-op casts from the value. */
10589 STRIP_TYPE_NOPS (value);
10591 if (! processing_template_decl)
10593 /* Validate and default VALUE. */
10594 if (value != NULL_TREE)
10596 value = integral_constant_value (value);
10598 if (TREE_CODE (value) == INTEGER_CST)
10600 value = perform_integral_promotions (value);
10601 constant_expression_warning (value);
10605 error ("enumerator value for %qD is not an integer constant", name);
10610 /* Default based on previous value. */
10611 if (value == NULL_TREE)
10613 if (TYPE_VALUES (enumtype))
10616 unsigned HOST_WIDE_INT lo;
10620 /* The next value is the previous value plus one. We can
10621 safely assume that the previous value is an INTEGER_CST.
10622 add_double doesn't know the type of the target expression,
10623 so we must check with int_fits_type_p as well. */
10624 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10625 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10626 TREE_INT_CST_HIGH (prev_value),
10628 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10629 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10633 error ("overflow in enumeration values at %qD", name);
10634 value = error_mark_node;
10638 value = integer_zero_node;
10641 /* Remove no-op casts from the value. */
10642 STRIP_TYPE_NOPS (value);
10645 /* C++ associates enums with global, function, or class declarations. */
10646 context = current_scope ();
10648 /* Build the actual enumeration constant. Note that the enumeration
10649 constants have the type of their initializers until the
10650 enumeration is complete:
10654 Following the closing brace of an enum-specifier, each enumer-
10655 ator has the type of its enumeration. Prior to the closing
10656 brace, the type of each enumerator is the type of its
10657 initializing value.
10659 In finish_enum we will reset the type. Of course, if we're
10660 processing a template, there may be no value. */
10661 type = value ? TREE_TYPE (value) : NULL_TREE;
10663 if (context && context == current_class_type)
10664 /* This enum declaration is local to the class. We need the full
10665 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10666 decl = build_lang_decl (CONST_DECL, name, type);
10668 /* It's a global enum, or it's local to a function. (Note local to
10669 a function could mean local to a class method. */
10670 decl = build_decl (CONST_DECL, name, type);
10672 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10673 TREE_CONSTANT (decl) = 1;
10674 TREE_INVARIANT (decl) = 1;
10675 TREE_READONLY (decl) = 1;
10676 DECL_INITIAL (decl) = value;
10678 if (context && context == current_class_type)
10679 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10680 on the TYPE_FIELDS list for `S'. (That's so that you can say
10681 things like `S::i' later.) */
10682 finish_member_declaration (decl);
10686 /* Add this enumeration constant to the list for this type. */
10687 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10691 /* We're defining DECL. Make sure that it's type is OK. */
10694 check_function_type (tree decl, tree current_function_parms)
10696 tree fntype = TREE_TYPE (decl);
10697 tree return_type = complete_type (TREE_TYPE (fntype));
10699 /* In a function definition, arg types must be complete. */
10700 require_complete_types_for_parms (current_function_parms);
10702 if (dependent_type_p (return_type))
10704 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
10706 tree args = TYPE_ARG_TYPES (fntype);
10708 error ("return type %q#T is incomplete", return_type);
10710 /* Make it return void instead. */
10711 if (TREE_CODE (fntype) == METHOD_TYPE)
10712 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
10714 TREE_CHAIN (args));
10716 fntype = build_function_type (void_type_node, args);
10718 = build_exception_variant (fntype,
10719 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
10722 abstract_virtuals_error (decl, TREE_TYPE (fntype));
10725 /* Create the FUNCTION_DECL for a function definition.
10726 DECLSPECS and DECLARATOR are the parts of the declaration;
10727 they describe the function's name and the type it returns,
10728 but twisted together in a fashion that parallels the syntax of C.
10730 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
10731 DECLARATOR is really the DECL for the function we are about to
10732 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
10733 indicating that the function is an inline defined in-class.
10735 This function creates a binding context for the function body
10736 as well as setting up the FUNCTION_DECL in current_function_decl.
10738 For C++, we must first check whether that datum makes any sense.
10739 For example, "class A local_a(1,2);" means that variable local_a
10740 is an aggregate of type A, which should have a constructor
10741 applied to it with the argument list [1, 2].
10743 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
10744 or may be a BLOCK if the function has been defined previously
10745 in this translation unit. On exit, DECL_INITIAL (decl1) will be
10746 error_mark_node if the function has never been defined, or
10747 a BLOCK if the function has been defined somewhere. */
10750 start_preparsed_function (tree decl1, tree attrs, int flags)
10752 tree ctype = NULL_TREE;
10755 int doing_friend = 0;
10756 struct cp_binding_level *bl;
10757 tree current_function_parms;
10758 struct c_fileinfo *finfo
10759 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
10760 bool honor_interface;
10762 /* Sanity check. */
10763 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
10764 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
10766 fntype = TREE_TYPE (decl1);
10767 if (TREE_CODE (fntype) == METHOD_TYPE)
10768 ctype = TYPE_METHOD_BASETYPE (fntype);
10770 /* ISO C++ 11.4/5. A friend function defined in a class is in
10771 the (lexical) scope of the class in which it is defined. */
10772 if (!ctype && DECL_FRIEND_P (decl1))
10774 ctype = DECL_FRIEND_CONTEXT (decl1);
10776 /* CTYPE could be null here if we're dealing with a template;
10777 for example, `inline friend float foo()' inside a template
10778 will have no CTYPE set. */
10779 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
10785 if (DECL_DECLARED_INLINE_P (decl1)
10786 && lookup_attribute ("noinline", attrs))
10787 warning (0, "inline function %q+D given attribute noinline", decl1);
10789 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
10790 /* This is a constructor, we must ensure that any default args
10791 introduced by this definition are propagated to the clones
10792 now. The clones are used directly in overload resolution. */
10793 adjust_clone_args (decl1);
10795 /* Sometimes we don't notice that a function is a static member, and
10796 build a METHOD_TYPE for it. Fix that up now. */
10797 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
10798 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
10800 revert_static_member_fn (decl1);
10804 /* Set up current_class_type, and enter the scope of the class, if
10807 push_nested_class (ctype);
10808 else if (DECL_STATIC_FUNCTION_P (decl1))
10809 push_nested_class (DECL_CONTEXT (decl1));
10811 /* Now that we have entered the scope of the class, we must restore
10812 the bindings for any template parameters surrounding DECL1, if it
10813 is an inline member template. (Order is important; consider the
10814 case where a template parameter has the same name as a field of
10815 the class.) It is not until after this point that
10816 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
10817 if (flags & SF_INCLASS_INLINE)
10818 maybe_begin_member_template_processing (decl1);
10820 /* Effective C++ rule 15. */
10822 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
10823 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
10824 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
10826 /* Make the init_value nonzero so pushdecl knows this is not tentative.
10827 error_mark_node is replaced below (in poplevel) with the BLOCK. */
10828 if (!DECL_INITIAL (decl1))
10829 DECL_INITIAL (decl1) = error_mark_node;
10831 /* This function exists in static storage.
10832 (This does not mean `static' in the C sense!) */
10833 TREE_STATIC (decl1) = 1;
10835 /* We must call push_template_decl after current_class_type is set
10836 up. (If we are processing inline definitions after exiting a
10837 class scope, current_class_type will be NULL_TREE until set above
10838 by push_nested_class.) */
10839 if (processing_template_decl)
10841 /* FIXME: Handle error_mark_node more gracefully. */
10842 tree newdecl1 = push_template_decl (decl1);
10843 if (newdecl1 != error_mark_node)
10847 /* We are now in the scope of the function being defined. */
10848 current_function_decl = decl1;
10850 /* Save the parm names or decls from this function's declarator
10851 where store_parm_decls will find them. */
10852 current_function_parms = DECL_ARGUMENTS (decl1);
10854 /* Make sure the parameter and return types are reasonable. When
10855 you declare a function, these types can be incomplete, but they
10856 must be complete when you define the function. */
10857 check_function_type (decl1, current_function_parms);
10859 /* Build the return declaration for the function. */
10860 restype = TREE_TYPE (fntype);
10861 if (DECL_RESULT (decl1) == NULL_TREE)
10865 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
10866 DECL_ARTIFICIAL (resdecl) = 1;
10867 DECL_IGNORED_P (resdecl) = 1;
10868 DECL_RESULT (decl1) = resdecl;
10870 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
10873 /* Let the user know we're compiling this function. */
10874 announce_function (decl1);
10876 /* Record the decl so that the function name is defined.
10877 If we already have a decl for this name, and it is a FUNCTION_DECL,
10878 use the old decl. */
10879 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
10881 /* A specialization is not used to guide overload resolution. */
10882 if (!DECL_FUNCTION_MEMBER_P (decl1)
10883 && !(DECL_USE_TEMPLATE (decl1) &&
10884 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
10886 tree olddecl = pushdecl (decl1);
10888 if (olddecl == error_mark_node)
10889 /* If something went wrong when registering the declaration,
10890 use DECL1; we have to have a FUNCTION_DECL to use when
10891 parsing the body of the function. */
10895 /* Otherwise, OLDDECL is either a previous declaration
10896 of the same function or DECL1 itself. */
10898 if (warn_missing_declarations
10899 && olddecl == decl1
10900 && !DECL_MAIN_P (decl1)
10901 && TREE_PUBLIC (decl1)
10902 && !DECL_DECLARED_INLINE_P (decl1))
10906 /* Check whether DECL1 is in an anonymous
10908 for (context = DECL_CONTEXT (decl1);
10910 context = DECL_CONTEXT (context))
10912 if (TREE_CODE (context) == NAMESPACE_DECL
10913 && DECL_NAME (context) == NULL_TREE)
10917 if (context == NULL)
10918 warning (OPT_Wmissing_declarations,
10919 "no previous declaration for %q+D", decl1);
10927 /* We need to set the DECL_CONTEXT. */
10928 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
10929 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
10931 fntype = TREE_TYPE (decl1);
10933 /* If #pragma weak applies, mark the decl appropriately now.
10934 The pragma only applies to global functions. Because
10935 determining whether or not the #pragma applies involves
10936 computing the mangled name for the declaration, we cannot
10937 apply the pragma until after we have merged this declaration
10938 with any previous declarations; if the original declaration
10939 has a linkage specification, that specification applies to
10940 the definition as well, and may affect the mangled name. */
10941 if (!DECL_CONTEXT (decl1))
10942 maybe_apply_pragma_weak (decl1);
10945 /* Reset this in case the call to pushdecl changed it. */
10946 current_function_decl = decl1;
10948 gcc_assert (DECL_INITIAL (decl1));
10950 /* This function may already have been parsed, in which case just
10951 return; our caller will skip over the body without parsing. */
10952 if (DECL_INITIAL (decl1) != error_mark_node)
10955 /* Initialize RTL machinery. We cannot do this until
10956 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
10957 even when processing a template; this is how we get
10958 CFUN set up, and our per-function variables initialized.
10959 FIXME factor out the non-RTL stuff. */
10960 bl = current_binding_level;
10961 allocate_struct_function (decl1);
10962 current_binding_level = bl;
10964 /* Even though we're inside a function body, we still don't want to
10965 call expand_expr to calculate the size of a variable-sized array.
10966 We haven't necessarily assigned RTL to all variables yet, so it's
10967 not safe to try to expand expressions involving them. */
10968 cfun->x_dont_save_pending_sizes_p = 1;
10970 /* Start the statement-tree, start the tree now. */
10971 DECL_SAVED_TREE (decl1) = push_stmt_list ();
10973 /* If we are (erroneously) defining a function that we have already
10974 defined before, wipe out what we knew before. */
10975 if (!DECL_PENDING_INLINE_P (decl1))
10976 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
10978 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
10980 /* We know that this was set up by `grokclassfn'. We do not
10981 wait until `store_parm_decls', since evil parse errors may
10982 never get us to that point. Here we keep the consistency
10983 between `current_class_type' and `current_class_ptr'. */
10984 tree t = DECL_ARGUMENTS (decl1);
10986 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
10987 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
10989 cp_function_chain->x_current_class_ref
10990 = build_indirect_ref (t, NULL);
10991 cp_function_chain->x_current_class_ptr = t;
10993 /* Constructors and destructors need to know whether they're "in
10994 charge" of initializing virtual base classes. */
10995 t = TREE_CHAIN (t);
10996 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
10998 current_in_charge_parm = t;
10999 t = TREE_CHAIN (t);
11001 if (DECL_HAS_VTT_PARM_P (decl1))
11003 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11004 current_vtt_parm = t;
11008 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11009 /* Implicitly-defined methods (like the
11010 destructor for a class in which no destructor
11011 is explicitly declared) must not be defined
11012 until their definition is needed. So, we
11013 ignore interface specifications for
11014 compiler-generated functions. */
11015 && !DECL_ARTIFICIAL (decl1));
11017 if (DECL_INTERFACE_KNOWN (decl1))
11019 tree ctx = decl_function_context (decl1);
11021 if (DECL_NOT_REALLY_EXTERN (decl1))
11022 DECL_EXTERNAL (decl1) = 0;
11024 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11025 && TREE_PUBLIC (ctx))
11026 /* This is a function in a local class in an extern inline
11028 comdat_linkage (decl1);
11030 /* If this function belongs to an interface, it is public.
11031 If it belongs to someone else's interface, it is also external.
11032 This only affects inlines and template instantiations. */
11033 else if (!finfo->interface_unknown && honor_interface)
11035 if (DECL_DECLARED_INLINE_P (decl1)
11036 || DECL_TEMPLATE_INSTANTIATION (decl1)
11037 || processing_template_decl)
11039 DECL_EXTERNAL (decl1)
11040 = (finfo->interface_only
11041 || (DECL_DECLARED_INLINE_P (decl1)
11042 && ! flag_implement_inlines
11043 && !DECL_VINDEX (decl1)));
11045 /* For WIN32 we also want to put these in linkonce sections. */
11046 maybe_make_one_only (decl1);
11049 DECL_EXTERNAL (decl1) = 0;
11050 DECL_INTERFACE_KNOWN (decl1) = 1;
11051 /* If this function is in an interface implemented in this file,
11052 make sure that the back end knows to emit this function
11054 if (!DECL_EXTERNAL (decl1))
11055 mark_needed (decl1);
11057 else if (finfo->interface_unknown && finfo->interface_only
11058 && honor_interface)
11060 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11061 interface, we will have both finfo->interface_unknown and
11062 finfo->interface_only set. In that case, we don't want to
11063 use the normal heuristics because someone will supply a
11064 #pragma implementation elsewhere, and deducing it here would
11065 produce a conflict. */
11066 comdat_linkage (decl1);
11067 DECL_EXTERNAL (decl1) = 0;
11068 DECL_INTERFACE_KNOWN (decl1) = 1;
11069 DECL_DEFER_OUTPUT (decl1) = 1;
11073 /* This is a definition, not a reference.
11074 So clear DECL_EXTERNAL. */
11075 DECL_EXTERNAL (decl1) = 0;
11077 if ((DECL_DECLARED_INLINE_P (decl1)
11078 || DECL_TEMPLATE_INSTANTIATION (decl1))
11079 && ! DECL_INTERFACE_KNOWN (decl1)
11080 /* Don't try to defer nested functions for now. */
11081 && ! decl_function_context (decl1))
11082 DECL_DEFER_OUTPUT (decl1) = 1;
11084 DECL_INTERFACE_KNOWN (decl1) = 1;
11087 /* Determine the ELF visibility attribute for the function. We must not
11088 do this before calling "pushdecl", as we must allow "duplicate_decls"
11089 to merge any attributes appropriately. We also need to wait until
11091 if (!DECL_CLONED_FUNCTION_P (decl1))
11092 determine_visibility (decl1);
11094 begin_scope (sk_function_parms, decl1);
11098 if (DECL_DESTRUCTOR_P (decl1)
11099 || (DECL_CONSTRUCTOR_P (decl1)
11100 && targetm.cxx.cdtor_returns_this ()))
11102 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11103 DECL_CONTEXT (cdtor_label) = current_function_decl;
11106 start_fname_decls ();
11108 store_parm_decls (current_function_parms);
11112 /* Like start_preparsed_function, except that instead of a
11113 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11115 Returns 1 on success. If the DECLARATOR is not suitable for a function
11116 (it defines a datum instead), we return 0, which tells
11117 yyparse to report a parse error. */
11120 start_function (cp_decl_specifier_seq *declspecs,
11121 const cp_declarator *declarator,
11126 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11127 /* If the declarator is not suitable for a function definition,
11128 cause a syntax error. */
11129 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11132 if (DECL_MAIN_P (decl1))
11133 /* main must return int. grokfndecl should have corrected it
11134 (and issued a diagnostic) if the user got it wrong. */
11135 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11136 integer_type_node));
11138 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11143 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11147 use_eh_spec_block (tree fn)
11149 return (flag_exceptions && flag_enforce_eh_specs
11150 && !processing_template_decl
11151 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11152 /* We insert the EH_SPEC_BLOCK only in the original
11153 function; then, it is copied automatically to the
11155 && !DECL_CLONED_FUNCTION_P (fn)
11156 /* Implicitly-generated constructors and destructors have
11157 exception specifications. However, those specifications
11158 are the union of the possible exceptions specified by the
11159 constructors/destructors for bases and members, so no
11160 unallowed exception will ever reach this function. By
11161 not creating the EH_SPEC_BLOCK we save a little memory,
11162 and we avoid spurious warnings about unreachable
11164 && !DECL_ARTIFICIAL (fn));
11167 /* Store the parameter declarations into the current function declaration.
11168 This is called after parsing the parameter declarations, before
11169 digesting the body of the function.
11171 Also install to binding contour return value identifier, if any. */
11174 store_parm_decls (tree current_function_parms)
11176 tree fndecl = current_function_decl;
11179 /* This is a chain of any other decls that came in among the parm
11180 declarations. If a parm is declared with enum {foo, bar} x;
11181 then CONST_DECLs for foo and bar are put here. */
11182 tree nonparms = NULL_TREE;
11184 if (current_function_parms)
11186 /* This case is when the function was defined with an ANSI prototype.
11187 The parms already have decls, so we need not do anything here
11188 except record them as in effect
11189 and complain if any redundant old-style parm decls were written. */
11191 tree specparms = current_function_parms;
11194 /* Must clear this because it might contain TYPE_DECLs declared
11196 current_binding_level->names = NULL;
11198 /* If we're doing semantic analysis, then we'll call pushdecl
11199 for each of these. We must do them in reverse order so that
11200 they end in the correct forward order. */
11201 specparms = nreverse (specparms);
11203 for (parm = specparms; parm; parm = next)
11205 next = TREE_CHAIN (parm);
11206 if (TREE_CODE (parm) == PARM_DECL)
11208 if (DECL_NAME (parm) == NULL_TREE
11209 || TREE_CODE (parm) != VOID_TYPE)
11212 error ("parameter %qD declared void", parm);
11216 /* If we find an enum constant or a type tag,
11217 put it aside for the moment. */
11218 TREE_CHAIN (parm) = NULL_TREE;
11219 nonparms = chainon (nonparms, parm);
11223 /* Get the decls in their original chain order and record in the
11224 function. This is all and only the PARM_DECLs that were
11225 pushed into scope by the loop above. */
11226 DECL_ARGUMENTS (fndecl) = getdecls ();
11229 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11231 /* Now store the final chain of decls for the arguments
11232 as the decl-chain of the current lexical scope.
11233 Put the enumerators in as well, at the front so that
11234 DECL_ARGUMENTS is not modified. */
11235 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11237 if (use_eh_spec_block (current_function_decl))
11238 current_eh_spec_block = begin_eh_spec_block ();
11242 /* We have finished doing semantic analysis on DECL, but have not yet
11243 generated RTL for its body. Save away our current state, so that
11244 when we want to generate RTL later we know what to do. */
11247 save_function_data (tree decl)
11249 struct language_function *f;
11251 /* Save the language-specific per-function data so that we can
11252 get it back when we really expand this function. */
11253 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11256 f = GGC_NEW (struct language_function);
11257 memcpy (f, cp_function_chain, sizeof (struct language_function));
11258 DECL_SAVED_FUNCTION_DATA (decl) = f;
11260 /* Clear out the bits we don't need. */
11261 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11262 f->bindings = NULL;
11263 f->x_local_names = NULL;
11267 /* Set the return value of the constructor (if present). */
11270 finish_constructor_body (void)
11275 if (targetm.cxx.cdtor_returns_this ())
11277 /* Any return from a constructor will end up here. */
11278 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11280 val = DECL_ARGUMENTS (current_function_decl);
11281 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11282 DECL_RESULT (current_function_decl), val);
11283 /* Return the address of the object. */
11284 exprstmt = build_stmt (RETURN_EXPR, val);
11285 add_stmt (exprstmt);
11289 /* Do all the processing for the beginning of a destructor; set up the
11290 vtable pointers and cleanups for bases and members. */
11293 begin_destructor_body (void)
11295 tree compound_stmt;
11297 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11298 issued an error message. We still want to try to process the
11299 body of the function, but initialize_vtbl_ptrs will crash if
11300 TYPE_BINFO is NULL. */
11301 if (COMPLETE_TYPE_P (current_class_type))
11303 compound_stmt = begin_compound_stmt (0);
11304 /* Make all virtual function table pointers in non-virtual base
11305 classes point to CURRENT_CLASS_TYPE's virtual function
11307 initialize_vtbl_ptrs (current_class_ptr);
11308 finish_compound_stmt (compound_stmt);
11310 /* And insert cleanups for our bases and members so that they
11311 will be properly destroyed if we throw. */
11312 push_base_cleanups ();
11316 /* At the end of every destructor we generate code to delete the object if
11317 necessary. Do that now. */
11320 finish_destructor_body (void)
11324 /* Any return from a destructor will end up here; that way all base
11325 and member cleanups will be run when the function returns. */
11326 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11328 /* In a virtual destructor, we must call delete. */
11329 if (DECL_VIRTUAL_P (current_function_decl))
11332 tree virtual_size = cxx_sizeof (current_class_type);
11336 At the point of definition of a virtual destructor (including
11337 an implicit definition), non-placement operator delete shall
11338 be looked up in the scope of the destructor's class and if
11339 found shall be accessible and unambiguous. */
11340 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11342 /*global_p=*/false,
11343 /*placement=*/NULL_TREE,
11344 /*alloc_fn=*/NULL_TREE);
11346 if_stmt = begin_if_stmt ();
11347 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11348 current_in_charge_parm,
11351 finish_expr_stmt (exprstmt);
11352 finish_then_clause (if_stmt);
11353 finish_if_stmt (if_stmt);
11356 if (targetm.cxx.cdtor_returns_this ())
11360 val = DECL_ARGUMENTS (current_function_decl);
11361 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11362 DECL_RESULT (current_function_decl), val);
11363 /* Return the address of the object. */
11364 exprstmt = build_stmt (RETURN_EXPR, val);
11365 add_stmt (exprstmt);
11369 /* Do the necessary processing for the beginning of a function body, which
11370 in this case includes member-initializers, but not the catch clauses of
11371 a function-try-block. Currently, this means opening a binding level
11372 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11375 begin_function_body (void)
11379 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11382 if (processing_template_decl)
11383 /* Do nothing now. */;
11385 /* Always keep the BLOCK node associated with the outermost pair of
11386 curly braces of a function. These are needed for correct
11387 operation of dwarfout.c. */
11388 keep_next_level (true);
11390 stmt = begin_compound_stmt (BCS_FN_BODY);
11392 if (processing_template_decl)
11393 /* Do nothing now. */;
11394 else if (DECL_DESTRUCTOR_P (current_function_decl))
11395 begin_destructor_body ();
11400 /* Do the processing for the end of a function body. Currently, this means
11401 closing out the cleanups for fully-constructed bases and members, and in
11402 the case of the destructor, deleting the object if desired. Again, this
11403 is only meaningful for [cd]tors, since they are the only functions where
11404 there is a significant distinction between the main body and any
11405 function catch clauses. Handling, say, main() return semantics here
11406 would be wrong, as flowing off the end of a function catch clause for
11407 main() would also need to return 0. */
11410 finish_function_body (tree compstmt)
11412 if (compstmt == NULL_TREE)
11415 /* Close the block. */
11416 finish_compound_stmt (compstmt);
11418 if (processing_template_decl)
11419 /* Do nothing now. */;
11420 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11421 finish_constructor_body ();
11422 else if (DECL_DESTRUCTOR_P (current_function_decl))
11423 finish_destructor_body ();
11426 /* Given a function, returns the BLOCK corresponding to the outermost level
11427 of curly braces, skipping the artificial block created for constructor
11431 outer_curly_brace_block (tree fndecl)
11433 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11434 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11435 /* Skip the artificial function body block. */
11436 block = BLOCK_SUBBLOCKS (block);
11440 /* Finish up a function declaration and compile that function
11441 all the way to assembler language output. The free the storage
11442 for the function definition.
11444 FLAGS is a bitwise or of the following values:
11446 We just finished processing the body of an in-class inline
11447 function definition. (This processing will have taken place
11448 after the class definition is complete.) */
11451 finish_function (int flags)
11453 tree fndecl = current_function_decl;
11454 tree fntype, ctype = NULL_TREE;
11455 int inclass_inline = (flags & 2) != 0;
11458 /* When we get some parse errors, we can end up without a
11459 current_function_decl, so cope. */
11460 if (fndecl == NULL_TREE)
11461 return error_mark_node;
11463 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11464 && DECL_VIRTUAL_P (fndecl)
11465 && !processing_template_decl)
11467 tree fnclass = DECL_CONTEXT (fndecl);
11468 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11469 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11472 nested = function_depth > 1;
11473 fntype = TREE_TYPE (fndecl);
11475 /* TREE_READONLY (fndecl) = 1;
11476 This caused &foo to be of type ptr-to-const-function
11477 which then got a warning when stored in a ptr-to-function variable. */
11479 gcc_assert (building_stmt_tree ());
11480 /* The current function is being defined, so its DECL_INITIAL should
11481 be set, and unless there's a multiple definition, it should be
11482 error_mark_node. */
11483 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11485 /* For a cloned function, we've already got all the code we need;
11486 there's no need to add any extra bits. */
11487 if (!DECL_CLONED_FUNCTION_P (fndecl))
11489 if (DECL_MAIN_P (current_function_decl))
11493 /* Make it so that `main' always returns 0 by default (or
11496 stmt = finish_return_stmt (integer_one_node);
11498 stmt = finish_return_stmt (integer_zero_node);
11500 /* Hack. We don't want the middle-end to warn that this
11501 return is unreachable, so put the statement on the
11503 #ifdef USE_MAPPED_LOCATION
11504 SET_EXPR_LOCATION (stmt, UNKNOWN_LOCATION);
11506 annotate_with_file_line (stmt, input_filename, 0);
11510 if (use_eh_spec_block (current_function_decl))
11511 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11512 (TREE_TYPE (current_function_decl)),
11513 current_eh_spec_block);
11516 /* If we're saving up tree structure, tie off the function now. */
11517 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11519 finish_fname_decls ();
11521 /* If this function can't throw any exceptions, remember that. */
11522 if (!processing_template_decl
11523 && !cp_function_chain->can_throw
11524 && !flag_non_call_exceptions
11525 && !DECL_REPLACEABLE_P (fndecl))
11526 TREE_NOTHROW (fndecl) = 1;
11528 /* This must come after expand_function_end because cleanups might
11529 have declarations (from inline functions) that need to go into
11530 this function's blocks. */
11532 /* If the current binding level isn't the outermost binding level
11533 for this function, either there is a bug, or we have experienced
11534 syntax errors and the statement tree is malformed. */
11535 if (current_binding_level->kind != sk_function_parms)
11537 /* Make sure we have already experienced errors. */
11538 gcc_assert (errorcount);
11540 /* Throw away the broken statement tree and extra binding
11542 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11544 while (current_binding_level->kind != sk_function_parms)
11546 if (current_binding_level->kind == sk_class)
11547 pop_nested_class ();
11549 poplevel (0, 0, 0);
11552 poplevel (1, 0, 1);
11554 /* Statements should always be full-expressions at the outermost set
11555 of curly braces for a function. */
11556 gcc_assert (stmts_are_full_exprs_p ());
11558 /* Set up the named return value optimization, if we can. Candidate
11559 variables are selected in check_return_expr. */
11560 if (current_function_return_value)
11562 tree r = current_function_return_value;
11565 if (r != error_mark_node
11566 /* This is only worth doing for fns that return in memory--and
11567 simpler, since we don't have to worry about promoted modes. */
11568 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11569 /* Only allow this for variables declared in the outer scope of
11570 the function so we know that their lifetime always ends with a
11571 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11572 we were to do this optimization in tree-ssa. */
11573 && (outer = outer_curly_brace_block (fndecl))
11574 && chain_member (r, BLOCK_VARS (outer)))
11575 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11577 current_function_return_value = NULL_TREE;
11580 /* Remember that we were in class scope. */
11581 if (current_class_name)
11582 ctype = current_class_type;
11584 /* Must mark the RESULT_DECL as being in this function. */
11585 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11587 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11588 to the FUNCTION_DECL node itself. */
11589 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11591 /* Save away current state, if appropriate. */
11592 if (!processing_template_decl)
11593 save_function_data (fndecl);
11595 /* Complain if there's just no return statement. */
11596 if (warn_return_type
11597 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11598 && !dependent_type_p (TREE_TYPE (fntype))
11599 && !current_function_returns_value && !current_function_returns_null
11600 /* Don't complain if we abort or throw. */
11601 && !current_function_returns_abnormally
11602 && !DECL_NAME (DECL_RESULT (fndecl))
11603 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11604 inline function, as we might never be compiled separately. */
11605 && (DECL_INLINE (fndecl) || processing_template_decl)
11606 /* Structor return values (if any) are set by the compiler. */
11607 && !DECL_CONSTRUCTOR_P (fndecl)
11608 && !DECL_DESTRUCTOR_P (fndecl))
11609 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11611 /* Store the end of the function, so that we get good line number
11612 info for the epilogue. */
11613 cfun->function_end_locus = input_location;
11615 /* Genericize before inlining. */
11616 if (!processing_template_decl)
11618 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11619 cp_genericize (fndecl);
11620 /* Clear out the bits we don't need. */
11621 f->x_current_class_ptr = NULL;
11622 f->x_current_class_ref = NULL;
11623 f->x_eh_spec_block = NULL;
11624 f->x_in_charge_parm = NULL;
11625 f->x_vtt_parm = NULL;
11626 f->x_return_value = NULL;
11627 f->bindings = NULL;
11628 f->extern_decl_map = NULL;
11630 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11631 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11633 /* Clear out the bits we don't need. */
11634 local_names = NULL;
11636 /* We're leaving the context of this function, so zap cfun. It's still in
11637 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11639 current_function_decl = NULL;
11641 /* If this is an in-class inline definition, we may have to pop the
11642 bindings for the template parameters that we added in
11643 maybe_begin_member_template_processing when start_function was
11645 if (inclass_inline)
11646 maybe_end_member_template_processing ();
11648 /* Leave the scope of the class. */
11650 pop_nested_class ();
11656 /* Let the error reporting routines know that we're outside a
11657 function. For a nested function, this value is used in
11658 cxx_pop_function_context and then reset via pop_function_context. */
11659 current_function_decl = NULL_TREE;
11664 /* Create the FUNCTION_DECL for a function definition.
11665 DECLSPECS and DECLARATOR are the parts of the declaration;
11666 they describe the return type and the name of the function,
11667 but twisted together in a fashion that parallels the syntax of C.
11669 This function creates a binding context for the function body
11670 as well as setting up the FUNCTION_DECL in current_function_decl.
11672 Returns a FUNCTION_DECL on success.
11674 If the DECLARATOR is not suitable for a function (it defines a datum
11675 instead), we return 0, which tells yyparse to report a parse error.
11677 May return void_type_node indicating that this method is actually
11678 a friend. See grokfield for more details.
11680 Came here with a `.pushlevel' .
11682 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11683 CHANGES TO CODE IN `grokfield'. */
11686 start_method (cp_decl_specifier_seq *declspecs,
11687 const cp_declarator *declarator, tree attrlist)
11689 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
11692 if (fndecl == error_mark_node)
11693 return error_mark_node;
11695 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
11697 error ("invalid member function declaration");
11698 return error_mark_node;
11702 cplus_decl_attributes (&fndecl, attrlist, 0);
11704 /* Pass friends other than inline friend functions back. */
11705 if (fndecl == void_type_node)
11708 if (DECL_IN_AGGR_P (fndecl))
11710 if (DECL_CONTEXT (fndecl)
11711 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
11712 error ("%qD is already defined in class %qT", fndecl,
11713 DECL_CONTEXT (fndecl));
11714 return error_mark_node;
11717 check_template_shadow (fndecl);
11719 DECL_DECLARED_INLINE_P (fndecl) = 1;
11720 if (flag_default_inline)
11721 DECL_INLINE (fndecl) = 1;
11723 /* We process method specializations in finish_struct_1. */
11724 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
11726 fndecl = push_template_decl (fndecl);
11727 if (fndecl == error_mark_node)
11731 if (! DECL_FRIEND_P (fndecl))
11733 if (TREE_CHAIN (fndecl))
11735 fndecl = copy_node (fndecl);
11736 TREE_CHAIN (fndecl) = NULL_TREE;
11740 finish_decl (fndecl, NULL_TREE, NULL_TREE);
11742 /* Make a place for the parms. */
11743 begin_scope (sk_function_parms, fndecl);
11745 DECL_IN_AGGR_P (fndecl) = 1;
11749 /* Go through the motions of finishing a function definition.
11750 We don't compile this method until after the whole class has
11753 FINISH_METHOD must return something that looks as though it
11754 came from GROKFIELD (since we are defining a method, after all).
11756 This is called after parsing the body of the function definition.
11757 STMTS is the chain of statements that makes up the function body.
11759 DECL is the ..._DECL that `start_method' provided. */
11762 finish_method (tree decl)
11764 tree fndecl = decl;
11769 if (decl == void_type_node)
11772 old_initial = DECL_INITIAL (fndecl);
11774 /* Undo the level for the parms (from start_method).
11775 This is like poplevel, but it causes nothing to be
11776 saved. Saving information here confuses symbol-table
11777 output routines. Besides, this information will
11778 be correctly output when this method is actually
11781 /* Clear out the meanings of the local variables of this level;
11782 also record in each decl which block it belongs to. */
11784 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
11786 if (DECL_NAME (link) != NULL_TREE)
11787 pop_binding (DECL_NAME (link), link);
11788 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
11789 DECL_CONTEXT (link) = NULL_TREE;
11792 poplevel (0, 0, 0);
11794 DECL_INITIAL (fndecl) = old_initial;
11796 /* We used to check if the context of FNDECL was different from
11797 current_class_type as another way to get inside here. This didn't work
11798 for String.cc in libg++. */
11799 if (DECL_FRIEND_P (fndecl))
11801 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
11803 decl = void_type_node;
11810 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
11811 we can lay it out later, when and if its type becomes complete. */
11814 maybe_register_incomplete_var (tree var)
11816 gcc_assert (TREE_CODE (var) == VAR_DECL);
11818 /* Keep track of variables with incomplete types. */
11819 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
11820 && DECL_EXTERNAL (var))
11822 tree inner_type = TREE_TYPE (var);
11824 while (TREE_CODE (inner_type) == ARRAY_TYPE)
11825 inner_type = TREE_TYPE (inner_type);
11826 inner_type = TYPE_MAIN_VARIANT (inner_type);
11828 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
11829 /* RTTI TD entries are created while defining the type_info. */
11830 || (TYPE_LANG_SPECIFIC (inner_type)
11831 && TYPE_BEING_DEFINED (inner_type)))
11832 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
11836 /* Called when a class type (given by TYPE) is defined. If there are
11837 any existing VAR_DECLs whose type hsa been completed by this
11838 declaration, update them now. */
11841 complete_vars (tree type)
11843 tree *list = &incomplete_vars;
11845 gcc_assert (CLASS_TYPE_P (type));
11848 if (same_type_p (type, TREE_PURPOSE (*list)))
11850 tree var = TREE_VALUE (*list);
11851 tree type = TREE_TYPE (var);
11852 /* Complete the type of the variable. The VAR_DECL itself
11853 will be laid out in expand_expr. */
11854 complete_type (type);
11855 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
11856 /* Remove this entry from the list. */
11857 *list = TREE_CHAIN (*list);
11860 list = &TREE_CHAIN (*list);
11863 /* Check for pending declarations which may have abstract type. */
11864 complete_type_check_abstract (type);
11867 /* If DECL is of a type which needs a cleanup, build and return an
11868 expression to perform that cleanup here. Return NULL_TREE if no
11869 cleanup need be done. */
11872 cxx_maybe_build_cleanup (tree decl)
11878 /* Assume no cleanup is required. */
11879 cleanup = NULL_TREE;
11881 if (error_operand_p (decl))
11884 /* Handle "__attribute__((cleanup))". We run the cleanup function
11885 before the destructor since the destructor is what actually
11886 terminates the lifetime of the object. */
11887 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
11894 /* Get the name specified by the user for the cleanup function. */
11895 id = TREE_VALUE (TREE_VALUE (attr));
11896 /* Look up the name to find the cleanup function to call. It is
11897 important to use lookup_name here because that is what is
11898 used in c-common.c:handle_cleanup_attribute when performing
11899 initial checks on the attribute. Note that those checks
11900 include ensuring that the function found is not an overloaded
11901 function, or an object with an overloaded call operator,
11902 etc.; we can rely on the fact that the functionfound is an
11903 ordinary FUNCTION_DECL. */
11904 fn = lookup_name (id);
11905 arg = build_address (decl);
11907 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
11910 /* Handle ordinary C++ destructors. */
11911 type = TREE_TYPE (decl);
11912 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
11914 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
11915 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
11916 && CLASSTYPE_VBASECLASSES (type));
11920 if (TREE_CODE (type) == ARRAY_TYPE)
11924 cxx_mark_addressable (decl);
11925 addr = build_unary_op (ADDR_EXPR, decl, 0);
11928 /* Optimize for space over speed here. */
11929 if (!has_vbases || flag_expensive_optimizations)
11930 flags |= LOOKUP_NONVIRTUAL;
11932 call = build_delete (TREE_TYPE (addr), addr,
11933 sfk_complete_destructor, flags, 0);
11935 cleanup = build_compound_expr (cleanup, call);
11943 /* When a stmt has been parsed, this function is called. */
11950 /* DECL was originally constructed as a non-static member function,
11951 but turned out to be static. Update it accordingly. */
11954 revert_static_member_fn (tree decl)
11957 tree function = TREE_TYPE (decl);
11958 tree args = TYPE_ARG_TYPES (function);
11960 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
11961 != TYPE_UNQUALIFIED)
11962 error ("static member function %q#D declared with type qualifiers", decl);
11964 args = TREE_CHAIN (args);
11965 tmp = build_function_type (TREE_TYPE (function), args);
11966 tmp = build_qualified_type (tmp, cp_type_quals (function));
11967 tmp = build_exception_variant (tmp,
11968 TYPE_RAISES_EXCEPTIONS (function));
11969 TREE_TYPE (decl) = tmp;
11970 if (DECL_ARGUMENTS (decl))
11971 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
11972 DECL_STATIC_FUNCTION_P (decl) = 1;
11975 /* Initialize the variables used during compilation of a C++
11979 cxx_push_function_context (struct function * f)
11981 struct language_function *p = GGC_CNEW (struct language_function);
11984 /* Whenever we start a new function, we destroy temporaries in the
11986 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11992 if (DECL_SAVED_FUNCTION_DATA (fn))
11994 /* If we already parsed this function, and we're just expanding it
11995 now, restore saved state. */
11996 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
11998 /* We don't need the saved data anymore. Unless this is an inline
11999 function; we need the named return value info for
12000 declare_return_variable. */
12001 if (! DECL_INLINE (fn))
12002 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
12007 /* Free the language-specific parts of F, now that we've finished
12008 compiling the function. */
12011 cxx_pop_function_context (struct function * f)
12016 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12017 one of the language-independent trees. */
12019 enum cp_tree_node_structure_enum
12020 cp_tree_node_structure (union lang_tree_node * t)
12022 switch (TREE_CODE (&t->generic))
12024 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12025 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12026 case OVERLOAD: return TS_CP_OVERLOAD;
12027 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12028 case PTRMEM_CST: return TS_CP_PTRMEM;
12029 case BASELINK: return TS_CP_BASELINK;
12030 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12031 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12032 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12033 default: return TS_CP_GENERIC;
12037 /* Build the void_list_node (void_type_node having been created). */
12039 build_void_list_node (void)
12041 tree t = build_tree_list (NULL_TREE, void_type_node);
12046 cp_missing_noreturn_ok_p (tree decl)
12048 /* A missing noreturn is ok for the `main' function. */
12049 return DECL_MAIN_P (decl);
12052 /* Return the COMDAT group into which DECL should be placed. */
12055 cxx_comdat_group (tree decl)
12059 /* Virtual tables, construction virtual tables, and virtual table
12060 tables all go in a single COMDAT group, named after the primary
12062 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12063 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12064 /* For all other DECLs, the COMDAT group is the mangled name of the
12065 declaration itself. */
12068 while (DECL_THUNK_P (decl))
12070 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12071 into the same section as the target function. In that case
12072 we must return target's name. */
12073 tree target = THUNK_TARGET (decl);
12074 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12075 && DECL_SECTION_NAME (target) != NULL
12076 && DECL_ONE_ONLY (target))
12081 name = DECL_ASSEMBLER_NAME (decl);
12084 return IDENTIFIER_POINTER (name);
12087 #include "gt-cp-decl.h"