1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
57 static tree grokparms (tree parmlist, tree *);
58 static const char *redeclaration_error_message (tree, tree);
60 static int decl_jump_unsafe (tree);
61 static void require_complete_types_for_parms (tree);
62 static int ambi_op_p (enum tree_code);
63 static int unary_op_p (enum tree_code);
64 static void push_local_name (tree);
65 static tree grok_reference_init (tree, tree, tree, tree *);
66 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
68 static void record_unknown_type (tree, const char *);
69 static tree builtin_function_1 (tree, tree, bool);
70 static tree build_library_fn_1 (tree, enum tree_code, tree);
71 static int member_function_or_else (tree, tree, enum overload_flags);
72 static void bad_specifiers (tree, const char *, int, int, int, int,
74 static void check_for_uninitialized_const_var (tree);
75 static hashval_t typename_hash (const void *);
76 static int typename_compare (const void *, const void *);
77 static tree local_variable_p_walkfn (tree *, int *, void *);
78 static tree record_builtin_java_type (const char *, int);
79 static const char *tag_name (enum tag_types);
80 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
81 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
82 static void maybe_deduce_size_from_array_init (tree, tree);
83 static void layout_var_decl (tree);
84 static tree check_initializer (tree, tree, int, tree *);
85 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
86 static void save_function_data (tree);
87 static void check_function_type (tree, tree);
88 static void finish_constructor_body (void);
89 static void begin_destructor_body (void);
90 static void finish_destructor_body (void);
91 static tree create_array_type_for_decl (tree, tree, tree);
92 static tree get_atexit_node (void);
93 static tree get_dso_handle_node (void);
94 static tree start_cleanup_fn (void);
95 static void end_cleanup_fn (void);
96 static tree cp_make_fname_decl (tree, int);
97 static void initialize_predefined_identifiers (void);
98 static tree check_special_function_return_type
99 (special_function_kind, tree, tree);
100 static tree push_cp_library_fn (enum tree_code, tree);
101 static tree build_cp_library_fn (tree, enum tree_code, tree);
102 static void store_parm_decls (tree);
103 static void initialize_local_var (tree, tree);
104 static void expand_static_init (tree, tree);
105 static tree next_initializable_field (tree);
107 /* The following symbols are subsumed in the cp_global_trees array, and
108 listed here individually for documentation purposes.
111 tree wchar_decl_node;
113 tree vtable_entry_type;
114 tree delta_type_node;
115 tree __t_desc_type_node;
117 tree class_type_node;
118 tree unknown_type_node;
120 Array type `vtable_entry_type[]'
123 tree vtbl_ptr_type_node;
130 A FUNCTION_DECL which can call `abort'. Not necessarily the
131 one that the user will declare, but sufficient to be called
132 by routines that want to abort the program.
136 The FUNCTION_DECL for the default `::operator delete'.
138 tree global_delete_fndecl;
141 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
142 tree tinfo_var_id; */
144 tree cp_global_trees[CPTI_MAX];
146 /* Indicates that there is a type value in some namespace, although
147 that is not necessarily in scope at the moment. */
149 tree global_type_node;
151 /* The node that holds the "name" of the global scope. */
152 tree global_scope_name;
154 #define local_names cp_function_chain->x_local_names
156 /* A list of objects which have constructors or destructors
157 which reside in the global scope. The decl is stored in
158 the TREE_VALUE slot and the initializer is stored
159 in the TREE_PURPOSE slot. */
160 tree static_aggregates;
164 /* A node for the integer constants 2, and 3. */
166 tree integer_two_node, integer_three_node;
168 /* Used only for jumps to as-yet undefined labels, since jumps to
169 defined labels can have their validity checked immediately. */
171 struct named_label_use_entry GTY(())
173 struct named_label_use_entry *next;
174 /* The binding level to which this entry is *currently* attached.
175 This is initially the binding level in which the goto appeared,
176 but is modified as scopes are closed. */
177 struct cp_binding_level *binding_level;
178 /* The head of the names list that was current when the goto appeared,
179 or the inner scope popped. These are the decls that will *not* be
180 skipped when jumping to the label. */
182 /* The location of the goto, for error reporting. */
183 location_t o_goto_locus;
184 /* True if an OpenMP structured block scope has been closed since
185 the goto appeared. This means that the branch from the label will
186 illegally exit an OpenMP scope. */
190 /* A list of all LABEL_DECLs in the function that have names. Here so
191 we can clear out their names' definitions at the end of the
192 function, and so we can check the validity of jumps to these labels. */
194 struct named_label_entry GTY(())
196 /* The decl itself. */
199 /* The binding level to which the label is *currently* attached.
200 This is initially set to the binding level in which the label
201 is defined, but is modified as scopes are closed. */
202 struct cp_binding_level *binding_level;
203 /* The head of the names list that was current when the label was
204 defined, or the inner scope popped. These are the decls that will
205 be skipped when jumping to the label. */
207 /* A tree list of all decls from all binding levels that would be
208 crossed by a backward branch to the label. */
211 /* A list of uses of the label, before the label is defined. */
212 struct named_label_use_entry *uses;
214 /* The following bits are set after the label is defined, and are
215 updated as scopes are popped. They indicate that a backward jump
216 to the label will illegally enter a scope of the given flavor. */
222 #define named_labels cp_function_chain->x_named_labels
224 /* The number of function bodies which we are currently processing.
225 (Zero if we are at namespace scope, one inside the body of a
226 function, two inside the body of a function in a local class, etc.) */
229 /* To avoid unwanted recursion, finish_function defers all mark_used calls
230 encountered during its execution until it finishes. */
231 bool defer_mark_used_calls;
232 VEC(tree, gc) *deferred_mark_used_calls;
234 /* States indicating how grokdeclarator() should handle declspecs marked
235 with __attribute__((deprecated)). An object declared as
236 __attribute__((deprecated)) suppresses warnings of uses of other
238 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
241 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
242 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
243 time the VAR_DECL was declared, the type was incomplete. */
245 static GTY(()) tree incomplete_vars;
247 /* Returns the kind of template specialization we are currently
248 processing, given that it's declaration contained N_CLASS_SCOPES
249 explicit scope qualifications. */
252 current_tmpl_spec_kind (int n_class_scopes)
254 int n_template_parm_scopes = 0;
255 int seen_specialization_p = 0;
256 int innermost_specialization_p = 0;
257 struct cp_binding_level *b;
259 /* Scan through the template parameter scopes. */
260 for (b = current_binding_level;
261 b->kind == sk_template_parms;
264 /* If we see a specialization scope inside a parameter scope,
265 then something is wrong. That corresponds to a declaration
268 template <class T> template <> ...
270 which is always invalid since [temp.expl.spec] forbids the
271 specialization of a class member template if the enclosing
272 class templates are not explicitly specialized as well. */
273 if (b->explicit_spec_p)
275 if (n_template_parm_scopes == 0)
276 innermost_specialization_p = 1;
278 seen_specialization_p = 1;
280 else if (seen_specialization_p == 1)
281 return tsk_invalid_member_spec;
283 ++n_template_parm_scopes;
286 /* Handle explicit instantiations. */
287 if (processing_explicit_instantiation)
289 if (n_template_parm_scopes != 0)
290 /* We've seen a template parameter list during an explicit
291 instantiation. For example:
293 template <class T> template void f(int);
295 This is erroneous. */
296 return tsk_invalid_expl_inst;
298 return tsk_expl_inst;
301 if (n_template_parm_scopes < n_class_scopes)
302 /* We've not seen enough template headers to match all the
303 specialized classes present. For example:
305 template <class T> void R<T>::S<T>::f(int);
307 This is invalid; there needs to be one set of template
308 parameters for each class. */
309 return tsk_insufficient_parms;
310 else if (n_template_parm_scopes == n_class_scopes)
311 /* We're processing a non-template declaration (even though it may
312 be a member of a template class.) For example:
314 template <class T> void S<T>::f(int);
316 The `class T' matches the `S<T>', leaving no template headers
317 corresponding to the `f'. */
319 else if (n_template_parm_scopes > n_class_scopes + 1)
320 /* We've got too many template headers. For example:
322 template <> template <class T> void f (T);
324 There need to be more enclosing classes. */
325 return tsk_excessive_parms;
327 /* This must be a template. It's of the form:
329 template <class T> template <class U> void S<T>::f(U);
331 This is a specialization if the innermost level was a
332 specialization; otherwise it's just a definition of the
334 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
337 /* Exit the current scope. */
345 /* When a label goes out of scope, check to see if that label was used
346 in a valid manner, and issue any appropriate warnings or errors. */
349 pop_label (tree label, tree old_value)
351 if (!processing_template_decl)
353 if (DECL_INITIAL (label) == NULL_TREE)
357 error ("label %q+D used but not defined", label);
358 location = input_location; /* FIXME want (input_filename, (line)0) */
359 /* Avoid crashing later. */
360 define_label (location, DECL_NAME (label));
363 warn_for_unused_label (label);
366 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
369 /* At the end of a function, all labels declared within the function
370 go out of scope. BLOCK is the top-level block for the
374 pop_labels_1 (void **slot, void *data)
376 struct named_label_entry *ent = (struct named_label_entry *) *slot;
377 tree block = (tree) data;
379 pop_label (ent->label_decl, NULL_TREE);
381 /* Put the labels into the "variables" of the top-level block,
382 so debugger can see them. */
383 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
384 BLOCK_VARS (block) = ent->label_decl;
386 htab_clear_slot (named_labels, slot);
392 pop_labels (tree block)
396 htab_traverse (named_labels, pop_labels_1, block);
401 /* At the end of a block with local labels, restore the outer definition. */
404 pop_local_label (tree label, tree old_value)
406 struct named_label_entry dummy;
409 pop_label (label, old_value);
411 dummy.label_decl = label;
412 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
413 htab_clear_slot (named_labels, slot);
416 /* The following two routines are used to interface to Objective-C++.
417 The binding level is purposely treated as an opaque type. */
420 objc_get_current_scope (void)
422 return current_binding_level;
425 /* The following routine is used by the NeXT-style SJLJ exceptions;
426 variables get marked 'volatile' so as to not be clobbered by
427 _setjmp()/_longjmp() calls. All variables in the current scope,
428 as well as parent scopes up to (but not including) ENCLOSING_BLK
429 shall be thusly marked. */
432 objc_mark_locals_volatile (void *enclosing_blk)
434 struct cp_binding_level *scope;
436 for (scope = current_binding_level;
437 scope && scope != enclosing_blk;
438 scope = scope->level_chain)
442 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
443 objc_volatilize_decl (decl);
445 /* Do not climb up past the current function. */
446 if (scope->kind == sk_function_parms)
451 /* Update data for defined and undefined labels when leaving a scope. */
454 poplevel_named_label_1 (void **slot, void *data)
456 struct named_label_entry *ent = (struct named_label_entry *) *slot;
457 struct cp_binding_level *bl = (struct cp_binding_level *) data;
458 struct cp_binding_level *obl = bl->level_chain;
460 if (ent->binding_level == bl)
464 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
465 if (decl_jump_unsafe (decl))
466 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
468 ent->binding_level = obl;
469 ent->names_in_scope = obl->names;
473 ent->in_try_scope = true;
476 ent->in_catch_scope = true;
479 ent->in_omp_scope = true;
487 struct named_label_use_entry *use;
489 for (use = ent->uses; use ; use = use->next)
490 if (use->binding_level == bl)
492 use->binding_level = obl;
493 use->names_in_scope = obl->names;
494 if (bl->kind == sk_omp)
495 use->in_omp_scope = true;
502 /* Exit a binding level.
503 Pop the level off, and restore the state of the identifier-decl mappings
504 that were in effect when this level was entered.
506 If KEEP == 1, this level had explicit declarations, so
507 and create a "block" (a BLOCK node) for the level
508 to record its declarations and subblocks for symbol table output.
510 If FUNCTIONBODY is nonzero, this level is the body of a function,
511 so create a block as if KEEP were set and also clear out all
514 If REVERSE is nonzero, reverse the order of decls before putting
515 them into the BLOCK. */
518 poplevel (int keep, int reverse, int functionbody)
521 /* The chain of decls was accumulated in reverse order.
522 Put it into forward order, just for cleanliness. */
524 int tmp = functionbody;
525 int real_functionbody;
529 int leaving_for_scope;
532 timevar_push (TV_NAME_LOOKUP);
537 gcc_assert (current_binding_level->kind != sk_class);
539 real_functionbody = (current_binding_level->kind == sk_cleanup
540 ? ((functionbody = 0), tmp) : functionbody);
541 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
543 gcc_assert (!VEC_length(cp_class_binding,
544 current_binding_level->class_shadowed));
546 /* We used to use KEEP == 2 to indicate that the new block should go
547 at the beginning of the list of blocks at this binding level,
548 rather than the end. This hack is no longer used. */
549 gcc_assert (keep == 0 || keep == 1);
551 if (current_binding_level->keep)
554 /* Any uses of undefined labels, and any defined labels, now operate
555 under constraints of next binding contour. */
556 if (cfun && !functionbody && named_labels)
557 htab_traverse (named_labels, poplevel_named_label_1,
558 current_binding_level);
560 /* Get the decls in the order they were written.
561 Usually current_binding_level->names is in reverse order.
562 But parameter decls were previously put in forward order. */
565 current_binding_level->names
566 = decls = nreverse (current_binding_level->names);
568 decls = current_binding_level->names;
570 /* If there were any declarations or structure tags in that level,
571 or if this level is a function body,
572 create a BLOCK to record them for the life of this function. */
574 if (keep == 1 || functionbody)
575 block = make_node (BLOCK);
576 if (block != NULL_TREE)
578 BLOCK_VARS (block) = decls;
579 BLOCK_SUBBLOCKS (block) = subblocks;
582 /* In each subblock, record that this is its superior. */
584 for (link = subblocks; link; link = BLOCK_CHAIN (link))
585 BLOCK_SUPERCONTEXT (link) = block;
587 /* We still support the old for-scope rules, whereby the variables
588 in a for-init statement were in scope after the for-statement
589 ended. We only use the new rules if flag_new_for_scope is
592 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
594 /* Before we remove the declarations first check for unused variables. */
595 if (warn_unused_variable
596 && !processing_template_decl)
597 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
598 if (TREE_CODE (decl) == VAR_DECL
599 && ! TREE_USED (decl)
600 && ! DECL_IN_SYSTEM_HEADER (decl)
601 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
602 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
604 /* Remove declarations for all the DECLs in this level. */
605 for (link = decls; link; link = TREE_CHAIN (link))
607 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
610 tree name = DECL_NAME (link);
614 ob = outer_binding (name,
615 IDENTIFIER_BINDING (name),
618 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
620 ns_binding = NULL_TREE;
622 if (ob && ob->scope == current_binding_level->level_chain)
623 /* We have something like:
628 and we are leaving the `for' scope. There's no reason to
629 keep the binding of the inner `i' in this case. */
630 pop_binding (name, link);
631 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
632 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
633 /* Here, we have something like:
641 We must pop the for-scope binding so we know what's a
642 type and what isn't. */
643 pop_binding (name, link);
646 /* Mark this VAR_DECL as dead so that we can tell we left it
647 there only for backward compatibility. */
648 DECL_DEAD_FOR_LOCAL (link) = 1;
650 /* Keep track of what should have happened when we
651 popped the binding. */
654 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
655 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
658 /* Add it to the list of dead variables in the next
659 outermost binding to that we can remove these when we
660 leave that binding. */
661 current_binding_level->level_chain->dead_vars_from_for
662 = tree_cons (NULL_TREE, link,
663 current_binding_level->level_chain->
666 /* Although we don't pop the cxx_binding, we do clear
667 its SCOPE since the scope is going away now. */
668 IDENTIFIER_BINDING (name)->scope
669 = current_binding_level->level_chain;
676 /* Remove the binding. */
679 if (TREE_CODE (decl) == TREE_LIST)
680 decl = TREE_VALUE (decl);
683 if (TREE_CODE (name) == OVERLOAD)
684 name = OVL_FUNCTION (name);
686 gcc_assert (DECL_P (name));
687 pop_binding (DECL_NAME (name), decl);
691 /* Remove declarations for any `for' variables from inner scopes
692 that we kept around. */
693 for (link = current_binding_level->dead_vars_from_for;
694 link; link = TREE_CHAIN (link))
695 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
697 /* Restore the IDENTIFIER_TYPE_VALUEs. */
698 for (link = current_binding_level->type_shadowed;
699 link; link = TREE_CHAIN (link))
700 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
702 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
703 for (link = current_binding_level->shadowed_labels;
705 link = TREE_CHAIN (link))
706 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
708 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
709 list if a `using' declaration put them there. The debugging
710 back ends won't understand OVERLOAD, so we remove them here.
711 Because the BLOCK_VARS are (temporarily) shared with
712 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
713 popped all the bindings. */
718 for (d = &BLOCK_VARS (block); *d; )
720 if (TREE_CODE (*d) == TREE_LIST)
721 *d = TREE_CHAIN (*d);
723 d = &TREE_CHAIN (*d);
727 /* If the level being exited is the top level of a function,
728 check over all the labels. */
731 /* Since this is the top level block of a function, the vars are
732 the function's parameters. Don't leave them in the BLOCK
733 because they are found in the FUNCTION_DECL instead. */
734 BLOCK_VARS (block) = 0;
738 kind = current_binding_level->kind;
739 if (kind == sk_cleanup)
743 /* If this is a temporary binding created for a cleanup, then we'll
744 have pushed a statement list level. Pop that, create a new
745 BIND_EXPR for the block, and insert it into the stream. */
746 stmt = pop_stmt_list (current_binding_level->statement_list);
747 stmt = c_build_bind_expr (block, stmt);
754 /* The current function is being defined, so its DECL_INITIAL
755 should be error_mark_node. */
756 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
757 DECL_INITIAL (current_function_decl) = block;
760 current_binding_level->blocks
761 = chainon (current_binding_level->blocks, block);
763 /* If we did not make a block for the level just exited,
764 any blocks made for inner levels
765 (since they cannot be recorded as subblocks in that level)
766 must be carried forward so they will later become subblocks
767 of something else. */
769 current_binding_level->blocks
770 = chainon (current_binding_level->blocks, subblocks);
772 /* Each and every BLOCK node created here in `poplevel' is important
773 (e.g. for proper debugging information) so if we created one
774 earlier, mark it as "used". */
776 TREE_USED (block) = 1;
778 /* All temporary bindings created for cleanups are popped silently. */
779 if (kind == sk_cleanup)
782 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
785 /* Insert BLOCK at the end of the list of subblocks of the
786 current binding level. This is used when a BIND_EXPR is expanded,
787 to handle the BLOCK node inside the BIND_EXPR. */
790 insert_block (tree block)
792 TREE_USED (block) = 1;
793 current_binding_level->blocks
794 = chainon (current_binding_level->blocks, block);
797 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
798 itself, calling F for each. The DATA is passed to F as well. */
801 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
804 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
806 result |= (*f) (name_space, data);
808 for (; current; current = TREE_CHAIN (current))
809 result |= walk_namespaces_r (current, f, data);
814 /* Walk all the namespaces, calling F for each. The DATA is passed to
818 walk_namespaces (walk_namespaces_fn f, void* data)
820 return walk_namespaces_r (global_namespace, f, data);
823 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
824 DATA is non-NULL, this is the last time we will call
825 wrapup_global_declarations for this NAMESPACE. */
828 wrapup_globals_for_namespace (tree name_space, void* data)
830 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
831 VEC(tree,gc) *statics = level->static_decls;
832 tree *vec = VEC_address (tree, statics);
833 int len = VEC_length (tree, statics);
834 int last_time = (data != 0);
838 check_global_declarations (vec, len);
839 emit_debug_global_declarations (vec, len);
843 /* Write out any globals that need to be output. */
844 return wrapup_global_declarations (vec, len);
848 /* In C++, you don't have to write `struct S' to refer to `S'; you
849 can just use `S'. We accomplish this by creating a TYPE_DECL as
850 if the user had written `typedef struct S S'. Create and return
851 the TYPE_DECL for TYPE. */
854 create_implicit_typedef (tree name, tree type)
858 decl = build_decl (TYPE_DECL, name, type);
859 DECL_ARTIFICIAL (decl) = 1;
860 /* There are other implicit type declarations, like the one *within*
861 a class that allows you to write `S::S'. We must distinguish
863 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
864 TYPE_NAME (type) = decl;
869 /* Remember a local name for name-mangling purposes. */
872 push_local_name (tree decl)
877 timevar_push (TV_NAME_LOOKUP);
879 name = DECL_NAME (decl);
881 nelts = VEC_length (tree, local_names);
882 for (i = 0; i < nelts; i++)
884 t = VEC_index (tree, local_names, i);
885 if (DECL_NAME (t) == name)
887 if (!DECL_LANG_SPECIFIC (decl))
888 retrofit_lang_decl (decl);
889 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
890 if (DECL_LANG_SPECIFIC (t))
891 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
893 DECL_DISCRIMINATOR (decl) = 1;
895 VEC_replace (tree, local_names, i, decl);
896 timevar_pop (TV_NAME_LOOKUP);
901 VEC_safe_push (tree, gc, local_names, decl);
902 timevar_pop (TV_NAME_LOOKUP);
905 /* Subroutine of duplicate_decls: return truthvalue of whether
906 or not types of these decls match.
908 For C++, we must compare the parameter list so that `int' can match
909 `int&' in a parameter position, but `int&' is not confused with
913 decls_match (tree newdecl, tree olddecl)
917 if (newdecl == olddecl)
920 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
921 /* If the two DECLs are not even the same kind of thing, we're not
922 interested in their types. */
925 if (TREE_CODE (newdecl) == FUNCTION_DECL)
927 tree f1 = TREE_TYPE (newdecl);
928 tree f2 = TREE_TYPE (olddecl);
929 tree p1 = TYPE_ARG_TYPES (f1);
930 tree p2 = TYPE_ARG_TYPES (f2);
932 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
933 && ! (DECL_EXTERN_C_P (newdecl)
934 && DECL_EXTERN_C_P (olddecl)))
937 if (TREE_CODE (f1) != TREE_CODE (f2))
940 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
942 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
943 && (DECL_BUILT_IN (olddecl)
944 #ifndef NO_IMPLICIT_EXTERN_C
945 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
946 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
950 types_match = self_promoting_args_p (p1);
951 if (p1 == void_list_node)
952 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
954 #ifndef NO_IMPLICIT_EXTERN_C
955 else if (p1 == NULL_TREE
956 && (DECL_EXTERN_C_P (olddecl)
957 && DECL_IN_SYSTEM_HEADER (olddecl)
958 && !DECL_CLASS_SCOPE_P (olddecl))
959 && (DECL_EXTERN_C_P (newdecl)
960 && DECL_IN_SYSTEM_HEADER (newdecl)
961 && !DECL_CLASS_SCOPE_P (newdecl)))
963 types_match = self_promoting_args_p (p2);
964 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
968 types_match = compparms (p1, p2);
973 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
975 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
976 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
979 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
980 DECL_TEMPLATE_PARMS (olddecl)))
983 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
984 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
985 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
987 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
988 DECL_TEMPLATE_RESULT (newdecl));
992 /* Need to check scope for variable declaration (VAR_DECL).
993 For typedef (TYPE_DECL), scope is ignored. */
994 if (TREE_CODE (newdecl) == VAR_DECL
995 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
997 Two declarations for an object with C language linkage
998 with the same name (ignoring the namespace that qualify
999 it) that appear in different namespace scopes refer to
1001 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1004 if (TREE_TYPE (newdecl) == error_mark_node)
1005 types_match = TREE_TYPE (olddecl) == error_mark_node;
1006 else if (TREE_TYPE (olddecl) == NULL_TREE)
1007 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1008 else if (TREE_TYPE (newdecl) == NULL_TREE)
1011 types_match = comptypes (TREE_TYPE (newdecl),
1012 TREE_TYPE (olddecl),
1013 COMPARE_REDECLARATION);
1019 /* If NEWDECL is `static' and an `extern' was seen previously,
1020 warn about it. OLDDECL is the previous declaration.
1022 Note that this does not apply to the C++ case of declaring
1023 a variable `extern const' and then later `const'.
1025 Don't complain about built-in functions, since they are beyond
1026 the user's control. */
1029 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1033 if (TREE_CODE (newdecl) == TYPE_DECL
1034 || TREE_CODE (newdecl) == TEMPLATE_DECL
1035 || TREE_CODE (newdecl) == CONST_DECL
1036 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1039 /* Don't get confused by static member functions; that's a different
1041 if (TREE_CODE (newdecl) == FUNCTION_DECL
1042 && DECL_STATIC_FUNCTION_P (newdecl))
1045 /* If the old declaration was `static', or the new one isn't, then
1046 then everything is OK. */
1047 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1050 /* It's OK to declare a builtin function as `static'. */
1051 if (TREE_CODE (olddecl) == FUNCTION_DECL
1052 && DECL_ARTIFICIAL (olddecl))
1055 name = DECL_ASSEMBLER_NAME (newdecl);
1056 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1057 permerror (input_location, "previous declaration of %q+D", olddecl);
1060 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1061 function templates. If their exception specifications do not
1062 match, issue a diagnostic. */
1065 check_redeclaration_exception_specification (tree new_decl,
1070 tree new_exceptions;
1071 tree old_exceptions;
1073 new_type = TREE_TYPE (new_decl);
1074 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1075 old_type = TREE_TYPE (old_decl);
1076 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1080 If any declaration of a function has an exception-specification,
1081 all declarations, including the definition and an explicit
1082 specialization, of that function shall have an
1083 exception-specification with the same set of type-ids. */
1084 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1085 && ! DECL_IS_BUILTIN (old_decl)
1087 && !comp_except_specs (new_exceptions, old_exceptions,
1090 error ("declaration of %qF throws different exceptions", new_decl);
1091 error ("from previous declaration %q+F", old_decl);
1095 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1096 && lookup_attribute ("gnu_inline", \
1097 DECL_ATTRIBUTES (fn)))
1099 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1100 If the redeclaration is invalid, a diagnostic is issued, and the
1101 error_mark_node is returned. Otherwise, OLDDECL is returned.
1103 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1106 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1109 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1111 unsigned olddecl_uid = DECL_UID (olddecl);
1112 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1113 int new_defines_function = 0;
1116 if (newdecl == olddecl)
1119 types_match = decls_match (newdecl, olddecl);
1121 /* If either the type of the new decl or the type of the old decl is an
1122 error_mark_node, then that implies that we have already issued an
1123 error (earlier) for some bogus type specification, and in that case,
1124 it is rather pointless to harass the user with yet more error message
1125 about the same declaration, so just pretend the types match here. */
1126 if (TREE_TYPE (newdecl) == error_mark_node
1127 || TREE_TYPE (olddecl) == error_mark_node)
1128 return error_mark_node;
1130 if (DECL_P (olddecl)
1131 && TREE_CODE (newdecl) == FUNCTION_DECL
1132 && TREE_CODE (olddecl) == FUNCTION_DECL
1133 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1135 if (DECL_DECLARED_INLINE_P (newdecl)
1136 && DECL_UNINLINABLE (newdecl)
1137 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1138 /* Already warned elsewhere. */;
1139 else if (DECL_DECLARED_INLINE_P (olddecl)
1140 && DECL_UNINLINABLE (olddecl)
1141 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1142 /* Already warned. */;
1143 else if (DECL_DECLARED_INLINE_P (newdecl)
1144 && DECL_UNINLINABLE (olddecl)
1145 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1147 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1149 warning (OPT_Wattributes, "previous declaration of %q+D "
1150 "with attribute noinline", olddecl);
1152 else if (DECL_DECLARED_INLINE_P (olddecl)
1153 && DECL_UNINLINABLE (newdecl)
1154 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1156 warning (OPT_Wattributes, "function %q+D redeclared with "
1157 "attribute noinline", newdecl);
1158 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1163 /* Check for redeclaration and other discrepancies. */
1164 if (TREE_CODE (olddecl) == FUNCTION_DECL
1165 && DECL_ARTIFICIAL (olddecl))
1167 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1168 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1170 /* Avoid warnings redeclaring built-ins which have not been
1171 explicitly declared. */
1172 if (DECL_ANTICIPATED (olddecl))
1175 /* If you declare a built-in or predefined function name as static,
1176 the old definition is overridden, but optionally warn this was a
1177 bad choice of name. */
1178 if (! TREE_PUBLIC (newdecl))
1180 warning (OPT_Wshadow, "shadowing %s function %q#D",
1181 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1183 /* Discard the old built-in function. */
1186 /* If the built-in is not ansi, then programs can override
1187 it even globally without an error. */
1188 else if (! DECL_BUILT_IN (olddecl))
1189 warning (0, "library function %q#D redeclared as non-function %q#D",
1193 error ("declaration of %q#D", newdecl);
1194 error ("conflicts with built-in declaration %q#D",
1199 else if (!types_match)
1201 /* Avoid warnings redeclaring built-ins which have not been
1202 explicitly declared. */
1203 if (DECL_ANTICIPATED (olddecl))
1205 /* Deal with fileptr_type_node. FILE type is not known
1206 at the time we create the builtins. */
1209 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1210 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1212 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1215 else if (TREE_VALUE (t2) == fileptr_type_node)
1217 tree t = TREE_VALUE (t1);
1219 if (TREE_CODE (t) == POINTER_TYPE
1220 && TYPE_NAME (TREE_TYPE (t))
1221 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1222 == get_identifier ("FILE")
1223 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1225 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1227 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1228 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1229 types_match = decls_match (newdecl, olddecl);
1231 return duplicate_decls (newdecl, olddecl,
1233 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1236 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1239 else if ((DECL_EXTERN_C_P (newdecl)
1240 && DECL_EXTERN_C_P (olddecl))
1241 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1242 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1244 /* A near match; override the builtin. */
1246 if (TREE_PUBLIC (newdecl))
1248 warning (0, "new declaration %q#D", newdecl);
1249 warning (0, "ambiguates built-in declaration %q#D",
1253 warning (OPT_Wshadow, "shadowing %s function %q#D",
1254 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1258 /* Discard the old built-in function. */
1261 /* Replace the old RTL to avoid problems with inlining. */
1262 COPY_DECL_RTL (newdecl, olddecl);
1264 /* Even if the types match, prefer the new declarations type for
1265 built-ins which have not been explicitly declared, for
1266 exception lists, etc... */
1267 else if (DECL_ANTICIPATED (olddecl))
1269 tree type = TREE_TYPE (newdecl);
1270 tree attribs = (*targetm.merge_type_attributes)
1271 (TREE_TYPE (olddecl), type);
1273 type = cp_build_type_attribute_variant (type, attribs);
1274 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1277 /* If a function is explicitly declared "throw ()", propagate that to
1278 the corresponding builtin. */
1279 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1280 && DECL_ANTICIPATED (olddecl)
1281 && TREE_NOTHROW (newdecl)
1282 && !TREE_NOTHROW (olddecl)
1283 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1284 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1286 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1288 /* Whether or not the builtin can throw exceptions has no
1289 bearing on this declarator. */
1290 TREE_NOTHROW (olddecl) = 0;
1292 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1294 /* If a builtin function is redeclared as `static', merge
1295 the declarations, but make the original one static. */
1296 DECL_THIS_STATIC (olddecl) = 1;
1297 TREE_PUBLIC (olddecl) = 0;
1299 /* Make the old declaration consistent with the new one so
1300 that all remnants of the builtin-ness of this function
1301 will be banished. */
1302 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1303 COPY_DECL_RTL (newdecl, olddecl);
1306 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1308 /* C++ Standard, 3.3, clause 4:
1309 "[Note: a namespace name or a class template name must be unique
1310 in its declarative region (7.3.2, clause 14). ]" */
1311 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1312 && TREE_CODE (newdecl) != NAMESPACE_DECL
1313 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1314 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1315 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1316 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1318 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1319 && TREE_CODE (newdecl) != TYPE_DECL)
1320 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1321 && TREE_CODE (olddecl) != TYPE_DECL))
1323 /* We do nothing special here, because C++ does such nasty
1324 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1325 get shadowed, and know that if we need to find a TYPE_DECL
1326 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1327 slot of the identifier. */
1331 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1332 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1333 || (TREE_CODE (olddecl) == FUNCTION_DECL
1334 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1338 error ("%q#D redeclared as different kind of symbol", newdecl);
1339 if (TREE_CODE (olddecl) == TREE_LIST)
1340 olddecl = TREE_VALUE (olddecl);
1341 error ("previous declaration of %q+#D", olddecl);
1343 return error_mark_node;
1345 else if (!types_match)
1347 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1348 /* These are certainly not duplicate declarations; they're
1349 from different scopes. */
1352 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1354 /* The name of a class template may not be declared to refer to
1355 any other template, class, function, object, namespace, value,
1356 or type in the same scope. */
1357 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1358 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1360 error ("declaration of template %q#D", newdecl);
1361 error ("conflicts with previous declaration %q+#D", olddecl);
1363 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1364 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1365 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1366 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1367 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1368 DECL_TEMPLATE_PARMS (olddecl))
1369 /* Template functions can be disambiguated by
1371 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1372 TREE_TYPE (TREE_TYPE (olddecl))))
1374 error ("new declaration %q#D", newdecl);
1375 error ("ambiguates old declaration %q+#D", olddecl);
1379 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1381 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1383 error ("declaration of C function %q#D conflicts with",
1385 error ("previous declaration %q+#D here", olddecl);
1387 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1388 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1390 error ("new declaration %q#D", newdecl);
1391 error ("ambiguates old declaration %q+#D", olddecl);
1392 return error_mark_node;
1399 error ("conflicting declaration %q#D", newdecl);
1400 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1401 return error_mark_node;
1404 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1405 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1406 && (!DECL_TEMPLATE_INFO (newdecl)
1407 || (DECL_TI_TEMPLATE (newdecl)
1408 != DECL_TI_TEMPLATE (olddecl))))
1409 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1410 && (!DECL_TEMPLATE_INFO (olddecl)
1411 || (DECL_TI_TEMPLATE (olddecl)
1412 != DECL_TI_TEMPLATE (newdecl))))))
1413 /* It's OK to have a template specialization and a non-template
1414 with the same type, or to have specializations of two
1415 different templates with the same type. Note that if one is a
1416 specialization, and the other is an instantiation of the same
1417 template, that we do not exit at this point. That situation
1418 can occur if we instantiate a template class, and then
1419 specialize one of its methods. This situation is valid, but
1420 the declarations must be merged in the usual way. */
1422 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1423 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1424 && !DECL_USE_TEMPLATE (newdecl))
1425 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1426 && !DECL_USE_TEMPLATE (olddecl))))
1427 /* One of the declarations is a template instantiation, and the
1428 other is not a template at all. That's OK. */
1430 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1432 /* In [namespace.alias] we have:
1434 In a declarative region, a namespace-alias-definition can be
1435 used to redefine a namespace-alias declared in that declarative
1436 region to refer only to the namespace to which it already
1439 Therefore, if we encounter a second alias directive for the same
1440 alias, we can just ignore the second directive. */
1441 if (DECL_NAMESPACE_ALIAS (newdecl)
1442 && (DECL_NAMESPACE_ALIAS (newdecl)
1443 == DECL_NAMESPACE_ALIAS (olddecl)))
1445 /* [namespace.alias]
1447 A namespace-name or namespace-alias shall not be declared as
1448 the name of any other entity in the same declarative region.
1449 A namespace-name defined at global scope shall not be
1450 declared as the name of any other entity in any global scope
1452 error ("declaration of namespace %qD conflicts with", newdecl);
1453 error ("previous declaration of namespace %q+D here", olddecl);
1454 return error_mark_node;
1458 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1461 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1462 if (DECL_NAME (olddecl) != NULL_TREE)
1463 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1464 ? "%q+#D previously defined here"
1465 : "%q+#D previously declared here", olddecl);
1466 return error_mark_node;
1468 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1469 && DECL_INITIAL (olddecl) != NULL_TREE
1470 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1471 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1473 /* Prototype decl follows defn w/o prototype. */
1474 warning (0, "prototype for %q+#D", newdecl);
1475 warning (0, "%Jfollows non-prototype definition here", olddecl);
1477 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1478 || TREE_CODE (olddecl) == VAR_DECL)
1479 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1482 If two declarations of the same function or object
1483 specify different linkage-specifications ..., the program
1484 is ill-formed.... Except for functions with C++ linkage,
1485 a function declaration without a linkage specification
1486 shall not precede the first linkage specification for
1487 that function. A function can be declared without a
1488 linkage specification after an explicit linkage
1489 specification has been seen; the linkage explicitly
1490 specified in the earlier declaration is not affected by
1491 such a function declaration.
1493 DR 563 raises the question why the restrictions on
1494 functions should not also apply to objects. Older
1495 versions of G++ silently ignore the linkage-specification
1503 which is clearly wrong. Therefore, we now treat objects
1505 if (current_lang_depth () == 0)
1507 /* There is no explicit linkage-specification, so we use
1508 the linkage from the previous declaration. */
1509 if (!DECL_LANG_SPECIFIC (newdecl))
1510 retrofit_lang_decl (newdecl);
1511 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1515 error ("previous declaration of %q+#D with %qL linkage",
1516 olddecl, DECL_LANGUAGE (olddecl));
1517 error ("conflicts with new declaration with %qL linkage",
1518 DECL_LANGUAGE (newdecl));
1522 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1524 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1526 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1527 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1530 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1531 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1533 for (; t1 && t1 != void_list_node;
1534 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1535 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1537 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1540 permerror (input_location, "default argument given for parameter %d of %q#D",
1542 permerror (input_location, "after previous specification in %q+#D", olddecl);
1546 error ("default argument given for parameter %d of %q#D",
1548 error ("after previous specification in %q+#D",
1555 /* Do not merge an implicit typedef with an explicit one. In:
1559 typedef class A A __attribute__ ((foo));
1561 the attribute should apply only to the typedef. */
1562 if (TREE_CODE (olddecl) == TYPE_DECL
1563 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1564 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1567 /* If new decl is `static' and an `extern' was seen previously,
1569 warn_extern_redeclared_static (newdecl, olddecl);
1571 /* We have committed to returning 1 at this point. */
1572 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1574 /* Now that functions must hold information normally held
1575 by field decls, there is extra work to do so that
1576 declaration information does not get destroyed during
1578 if (DECL_VINDEX (olddecl))
1579 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1580 if (DECL_CONTEXT (olddecl))
1581 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1582 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1583 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1584 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1585 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1586 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1587 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1588 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1589 SET_OVERLOADED_OPERATOR_CODE
1590 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1591 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1593 /* Optionally warn about more than one declaration for the same
1594 name, but don't warn about a function declaration followed by a
1596 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1597 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1598 /* Don't warn about extern decl followed by definition. */
1599 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1600 /* Don't warn about friends, let add_friend take care of it. */
1601 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1603 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1604 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1607 if (DECL_DELETED_FN (newdecl))
1609 error ("deleted definition of %qD", newdecl);
1610 error ("after previous declaration %q+D", olddecl);
1614 /* Deal with C++: must preserve virtual function table size. */
1615 if (TREE_CODE (olddecl) == TYPE_DECL)
1617 tree newtype = TREE_TYPE (newdecl);
1618 tree oldtype = TREE_TYPE (olddecl);
1620 if (newtype != error_mark_node && oldtype != error_mark_node
1621 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1622 CLASSTYPE_FRIEND_CLASSES (newtype)
1623 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1625 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1628 /* Copy all the DECL_... slots specified in the new decl
1629 except for any that we copy here from the old type. */
1630 DECL_ATTRIBUTES (newdecl)
1631 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1633 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1637 old_result = DECL_TEMPLATE_RESULT (olddecl);
1638 new_result = DECL_TEMPLATE_RESULT (newdecl);
1639 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1640 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1641 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1642 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1644 DECL_ATTRIBUTES (old_result)
1645 = (*targetm.merge_decl_attributes) (old_result, new_result);
1647 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1649 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1650 && DECL_INITIAL (new_result))
1652 if (DECL_INITIAL (old_result))
1653 DECL_UNINLINABLE (old_result) = 1;
1655 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1656 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1657 DECL_NOT_REALLY_EXTERN (old_result)
1658 = DECL_NOT_REALLY_EXTERN (new_result);
1659 DECL_INTERFACE_KNOWN (old_result)
1660 = DECL_INTERFACE_KNOWN (new_result);
1661 DECL_DECLARED_INLINE_P (old_result)
1662 = DECL_DECLARED_INLINE_P (new_result);
1663 DECL_DISREGARD_INLINE_LIMITS (old_result)
1664 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1669 DECL_DECLARED_INLINE_P (old_result)
1670 |= DECL_DECLARED_INLINE_P (new_result);
1671 DECL_DISREGARD_INLINE_LIMITS (old_result)
1672 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1673 check_redeclaration_exception_specification (newdecl, olddecl);
1677 /* If the new declaration is a definition, update the file and
1678 line information on the declaration, and also make
1679 the old declaration the same definition. */
1680 if (DECL_INITIAL (new_result) != NULL_TREE)
1682 DECL_SOURCE_LOCATION (olddecl)
1683 = DECL_SOURCE_LOCATION (old_result)
1684 = DECL_SOURCE_LOCATION (newdecl);
1685 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1686 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1689 DECL_ARGUMENTS (old_result)
1690 = DECL_ARGUMENTS (new_result);
1691 for (parm = DECL_ARGUMENTS (old_result); parm;
1692 parm = TREE_CHAIN (parm))
1693 DECL_CONTEXT (parm) = old_result;
1702 /* Automatically handles default parameters. */
1703 tree oldtype = TREE_TYPE (olddecl);
1706 /* Merge the data types specified in the two decls. */
1707 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1709 /* If merge_types produces a non-typedef type, just use the old type. */
1710 if (TREE_CODE (newdecl) == TYPE_DECL
1711 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1714 if (TREE_CODE (newdecl) == VAR_DECL)
1716 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1717 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1718 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1719 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1720 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1721 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1723 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1724 if (DECL_LANG_SPECIFIC (olddecl)
1725 && CP_DECL_THREADPRIVATE_P (olddecl))
1727 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1728 if (!DECL_LANG_SPECIFIC (newdecl))
1729 retrofit_lang_decl (newdecl);
1731 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1732 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1736 /* Do this after calling `merge_types' so that default
1737 parameters don't confuse us. */
1738 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1739 check_redeclaration_exception_specification (newdecl, olddecl);
1740 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1742 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1743 check_default_args (newdecl);
1745 /* Lay the type out, unless already done. */
1746 if (! same_type_p (newtype, oldtype)
1747 && TREE_TYPE (newdecl) != error_mark_node
1748 && !(processing_template_decl && uses_template_parms (newdecl)))
1749 layout_type (TREE_TYPE (newdecl));
1751 if ((TREE_CODE (newdecl) == VAR_DECL
1752 || TREE_CODE (newdecl) == PARM_DECL
1753 || TREE_CODE (newdecl) == RESULT_DECL
1754 || TREE_CODE (newdecl) == FIELD_DECL
1755 || TREE_CODE (newdecl) == TYPE_DECL)
1756 && !(processing_template_decl && uses_template_parms (newdecl)))
1757 layout_decl (newdecl, 0);
1759 /* Merge the type qualifiers. */
1760 if (TREE_READONLY (newdecl))
1761 TREE_READONLY (olddecl) = 1;
1762 if (TREE_THIS_VOLATILE (newdecl))
1763 TREE_THIS_VOLATILE (olddecl) = 1;
1764 if (TREE_NOTHROW (newdecl))
1765 TREE_NOTHROW (olddecl) = 1;
1767 /* Merge deprecatedness. */
1768 if (TREE_DEPRECATED (newdecl))
1769 TREE_DEPRECATED (olddecl) = 1;
1771 /* Preserve function specific target and optimization options */
1772 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1774 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1775 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1776 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1777 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1779 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1780 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1781 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1782 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1785 /* Merge the initialization information. */
1786 if (DECL_INITIAL (newdecl) == NULL_TREE
1787 && DECL_INITIAL (olddecl) != NULL_TREE)
1789 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1790 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1791 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1792 && DECL_LANG_SPECIFIC (newdecl)
1793 && DECL_LANG_SPECIFIC (olddecl))
1795 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1796 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1800 /* Merge the section attribute.
1801 We want to issue an error if the sections conflict but that must be
1802 done later in decl_attributes since we are called before attributes
1804 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1805 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1807 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1809 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1810 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1811 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1812 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1813 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1814 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1815 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1816 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1817 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1818 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1819 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1820 /* Keep the old RTL. */
1821 COPY_DECL_RTL (olddecl, newdecl);
1823 else if (TREE_CODE (newdecl) == VAR_DECL
1824 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1826 /* Keep the old RTL. We cannot keep the old RTL if the old
1827 declaration was for an incomplete object and the new
1828 declaration is not since many attributes of the RTL will
1830 COPY_DECL_RTL (olddecl, newdecl);
1833 /* If cannot merge, then use the new type and qualifiers,
1834 and don't preserve the old rtl. */
1837 /* Clean out any memory we had of the old declaration. */
1838 tree oldstatic = value_member (olddecl, static_aggregates);
1840 TREE_VALUE (oldstatic) = error_mark_node;
1842 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1843 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1844 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1845 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1848 /* Merge the storage class information. */
1849 merge_weak (newdecl, olddecl);
1851 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1852 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1853 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1854 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1855 if (! DECL_EXTERNAL (olddecl))
1856 DECL_EXTERNAL (newdecl) = 0;
1858 new_template = NULL_TREE;
1859 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1861 bool new_redefines_gnu_inline = false;
1863 if (new_defines_function
1864 && ((DECL_INTERFACE_KNOWN (olddecl)
1865 && TREE_CODE (olddecl) == FUNCTION_DECL)
1866 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1867 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1868 == FUNCTION_DECL))))
1872 if (TREE_CODE (fn) == TEMPLATE_DECL)
1873 fn = DECL_TEMPLATE_RESULT (olddecl);
1875 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1878 if (!new_redefines_gnu_inline)
1880 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1881 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1882 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1884 DECL_TEMPLATE_INSTANTIATED (newdecl)
1885 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1887 /* If the OLDDECL is an instantiation and/or specialization,
1888 then the NEWDECL must be too. But, it may not yet be marked
1889 as such if the caller has created NEWDECL, but has not yet
1890 figured out that it is a redeclaration. */
1891 if (!DECL_USE_TEMPLATE (newdecl))
1892 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1894 /* Don't really know how much of the language-specific
1895 values we should copy from old to new. */
1896 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1897 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1898 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1899 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1900 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1901 if (DECL_TEMPLATE_INFO (newdecl))
1902 new_template = DECL_TI_TEMPLATE (newdecl);
1903 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1904 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1905 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1906 olddecl_friend = DECL_FRIEND_P (olddecl);
1907 hidden_friend = (DECL_ANTICIPATED (olddecl)
1908 && DECL_HIDDEN_FRIEND_P (olddecl)
1909 && newdecl_is_friend);
1911 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1912 if (TREE_CODE (newdecl) == FUNCTION_DECL
1913 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1915 DECL_BEFRIENDING_CLASSES (newdecl)
1916 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1917 DECL_BEFRIENDING_CLASSES (olddecl));
1918 /* DECL_THUNKS is only valid for virtual functions,
1919 otherwise it is a DECL_FRIEND_CONTEXT. */
1920 if (DECL_VIRTUAL_P (newdecl))
1921 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1925 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1929 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1930 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1932 /* If newdecl is not a specialization, then it is not a
1933 template-related function at all. And that means that we
1934 should have exited above, returning 0. */
1935 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1937 if (TREE_USED (olddecl))
1938 /* From [temp.expl.spec]:
1940 If a template, a member template or the member of a class
1941 template is explicitly specialized then that
1942 specialization shall be declared before the first use of
1943 that specialization that would cause an implicit
1944 instantiation to take place, in every translation unit in
1945 which such a use occurs. */
1946 error ("explicit specialization of %qD after first use",
1949 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1951 /* Don't propagate visibility from the template to the
1952 specialization here. We'll do that in determine_visibility if
1954 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1956 /* [temp.expl.spec/14] We don't inline explicit specialization
1957 just because the primary template says so. */
1959 else if (new_defines_function && DECL_INITIAL (olddecl))
1961 /* Never inline re-defined extern inline functions.
1962 FIXME: this could be better handled by keeping both
1963 function as separate declarations. */
1964 DECL_UNINLINABLE (newdecl) = 1;
1968 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1969 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1971 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1973 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1974 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1976 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1977 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1978 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1979 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1982 /* Preserve abstractness on cloned [cd]tors. */
1983 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1985 /* Update newdecl's parms to point at olddecl. */
1986 for (parm = DECL_ARGUMENTS (newdecl); parm;
1987 parm = TREE_CHAIN (parm))
1988 DECL_CONTEXT (parm) = olddecl;
1992 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1993 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1994 COPY_DECL_RTL (newdecl, olddecl);
1996 if (! types_match || new_defines_function)
1998 /* These need to be copied so that the names are available.
1999 Note that if the types do match, we'll preserve inline
2000 info and other bits, but if not, we won't. */
2001 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2002 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2004 if (new_defines_function)
2005 /* If defining a function declared with other language
2006 linkage, use the previously declared language linkage. */
2007 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2008 else if (types_match)
2010 /* If redeclaring a builtin function, and not a definition,
2011 it stays built in. */
2012 if (DECL_BUILT_IN (olddecl))
2014 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2015 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2016 /* If we're keeping the built-in definition, keep the rtl,
2017 regardless of declaration matches. */
2018 COPY_DECL_RTL (olddecl, newdecl);
2021 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2022 /* Don't clear out the arguments if we're just redeclaring a
2024 if (DECL_ARGUMENTS (olddecl))
2025 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2028 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2029 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2031 /* Now preserve various other info from the definition. */
2032 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2033 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2034 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2035 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2037 /* Warn about conflicting visibility specifications. */
2038 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2039 && DECL_VISIBILITY_SPECIFIED (newdecl)
2040 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2042 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2043 "because it", newdecl);
2044 warning (OPT_Wattributes, "%Jconflicts with previous "
2045 "declaration here", olddecl);
2047 /* Choose the declaration which specified visibility. */
2048 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2050 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2051 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2053 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2054 so keep this behavior. */
2055 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2057 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2058 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2061 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2062 with that from NEWDECL below. */
2063 if (DECL_LANG_SPECIFIC (olddecl))
2065 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2066 != DECL_LANG_SPECIFIC (newdecl));
2067 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2070 /* Merge the USED information. */
2071 if (TREE_USED (olddecl))
2072 TREE_USED (newdecl) = 1;
2073 else if (TREE_USED (newdecl))
2074 TREE_USED (olddecl) = 1;
2076 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2080 function_size = sizeof (struct tree_decl_common);
2082 memcpy ((char *) olddecl + sizeof (struct tree_common),
2083 (char *) newdecl + sizeof (struct tree_common),
2084 function_size - sizeof (struct tree_common));
2086 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2087 (char *) newdecl + sizeof (struct tree_decl_common),
2088 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2090 /* If newdecl is a template instantiation, it is possible that
2091 the following sequence of events has occurred:
2093 o A friend function was declared in a class template. The
2094 class template was instantiated.
2096 o The instantiation of the friend declaration was
2097 recorded on the instantiation list, and is newdecl.
2099 o Later, however, instantiate_class_template called pushdecl
2100 on the newdecl to perform name injection. But, pushdecl in
2101 turn called duplicate_decls when it discovered that another
2102 declaration of a global function with the same name already
2105 o Here, in duplicate_decls, we decided to clobber newdecl.
2107 If we're going to do that, we'd better make sure that
2108 olddecl, and not newdecl, is on the list of
2109 instantiations so that if we try to do the instantiation
2110 again we won't get the clobbered declaration. */
2111 reregister_specialization (newdecl,
2117 size_t size = tree_code_size (TREE_CODE (olddecl));
2118 memcpy ((char *) olddecl + sizeof (struct tree_common),
2119 (char *) newdecl + sizeof (struct tree_common),
2120 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2121 switch (TREE_CODE (olddecl))
2131 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2132 (char *) newdecl + sizeof (struct tree_decl_common),
2133 size - sizeof (struct tree_decl_common)
2134 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2138 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2139 (char *) newdecl + sizeof (struct tree_decl_common),
2140 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2141 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2145 DECL_UID (olddecl) = olddecl_uid;
2147 DECL_FRIEND_P (olddecl) = 1;
2150 DECL_ANTICIPATED (olddecl) = 1;
2151 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2154 /* NEWDECL contains the merged attribute lists.
2155 Update OLDDECL to be the same. */
2156 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2158 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2159 so that encode_section_info has a chance to look at the new decl
2160 flags and attributes. */
2161 if (DECL_RTL_SET_P (olddecl)
2162 && (TREE_CODE (olddecl) == FUNCTION_DECL
2163 || (TREE_CODE (olddecl) == VAR_DECL
2164 && TREE_STATIC (olddecl))))
2165 make_decl_rtl (olddecl);
2167 /* The NEWDECL will no longer be needed. Because every out-of-class
2168 declaration of a member results in a call to duplicate_decls,
2169 freeing these nodes represents in a significant savings. */
2175 /* Return zero if the declaration NEWDECL is valid
2176 when the declaration OLDDECL (assumed to be for the same name)
2177 has already been seen.
2178 Otherwise return an error message format string with a %s
2179 where the identifier should go. */
2182 redeclaration_error_message (tree newdecl, tree olddecl)
2184 if (TREE_CODE (newdecl) == TYPE_DECL)
2186 /* Because C++ can put things into name space for free,
2187 constructs like "typedef struct foo { ... } foo"
2188 would look like an erroneous redeclaration. */
2189 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2192 return "redefinition of %q#D";
2194 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2196 /* If this is a pure function, its olddecl will actually be
2197 the original initialization to `0' (which we force to call
2198 abort()). Don't complain about redefinition in this case. */
2199 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2200 && DECL_INITIAL (olddecl) == NULL_TREE)
2203 /* If both functions come from different namespaces, this is not
2204 a redeclaration - this is a conflict with a used function. */
2205 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2206 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2207 && ! decls_match (olddecl, newdecl))
2208 return "%qD conflicts with used function";
2210 /* We'll complain about linkage mismatches in
2211 warn_extern_redeclared_static. */
2213 /* Defining the same name twice is no good. */
2214 if (DECL_INITIAL (olddecl) != NULL_TREE
2215 && DECL_INITIAL (newdecl) != NULL_TREE)
2217 if (DECL_NAME (olddecl) == NULL_TREE)
2218 return "%q#D not declared in class";
2219 else if (!GNU_INLINE_P (olddecl)
2220 || GNU_INLINE_P (newdecl))
2221 return "redefinition of %q#D";
2224 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2226 bool olda = GNU_INLINE_P (olddecl);
2227 bool newa = GNU_INLINE_P (newdecl);
2232 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2234 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2240 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2244 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2246 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2247 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2248 return "redefinition of %q#D";
2252 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2253 || (DECL_TEMPLATE_RESULT (newdecl)
2254 == DECL_TEMPLATE_RESULT (olddecl)))
2257 nt = DECL_TEMPLATE_RESULT (newdecl);
2258 if (DECL_TEMPLATE_INFO (nt))
2259 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2260 ot = DECL_TEMPLATE_RESULT (olddecl);
2261 if (DECL_TEMPLATE_INFO (ot))
2262 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2263 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2264 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2265 return "redefinition of %q#D";
2267 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2269 bool olda = GNU_INLINE_P (ot);
2270 bool newa = GNU_INLINE_P (nt);
2275 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2277 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2281 /* Core issue #226 (C++0x):
2283 If a friend function template declaration specifies a
2284 default template-argument, that declaration shall be a
2285 definition and shall be the only declaration of the
2286 function template in the translation unit. */
2287 if ((cxx_dialect != cxx98)
2288 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2289 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2290 /*is_primary=*/1, /*is_partial=*/0,
2291 /*is_friend_decl=*/2))
2292 return "redeclaration of friend %q#D may not have default template arguments";
2296 else if (TREE_CODE (newdecl) == VAR_DECL
2297 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2298 && (! DECL_LANG_SPECIFIC (olddecl)
2299 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2300 || DECL_THREAD_LOCAL_P (newdecl)))
2302 /* Only variables can be thread-local, and all declarations must
2303 agree on this property. */
2304 if (DECL_THREAD_LOCAL_P (newdecl))
2305 return "thread-local declaration of %q#D follows "
2306 "non-thread-local declaration";
2308 return "non-thread-local declaration of %q#D follows "
2309 "thread-local declaration";
2311 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2313 /* The objects have been declared at namespace scope. If either
2314 is a member of an anonymous union, then this is an invalid
2315 redeclaration. For example:
2321 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2322 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2323 return "redeclaration of %q#D";
2324 /* If at least one declaration is a reference, there is no
2325 conflict. For example:
2331 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2333 /* Reject two definitions. */
2334 return "redefinition of %q#D";
2338 /* Objects declared with block scope: */
2339 /* Reject two definitions, and reject a definition
2340 together with an external reference. */
2341 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2342 return "redeclaration of %q#D";
2347 /* Hash and equality functions for the named_label table. */
2350 named_label_entry_hash (const void *data)
2352 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2353 return DECL_UID (ent->label_decl);
2357 named_label_entry_eq (const void *a, const void *b)
2359 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2360 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2361 return ent_a->label_decl == ent_b->label_decl;
2364 /* Create a new label, named ID. */
2367 make_label_decl (tree id, int local_p)
2369 struct named_label_entry *ent;
2373 decl = build_decl (LABEL_DECL, id, void_type_node);
2375 DECL_CONTEXT (decl) = current_function_decl;
2376 DECL_MODE (decl) = VOIDmode;
2377 C_DECLARED_LABEL_FLAG (decl) = local_p;
2379 /* Say where one reference is to the label, for the sake of the
2380 error if it is not defined. */
2381 DECL_SOURCE_LOCATION (decl) = input_location;
2383 /* Record the fact that this identifier is bound to this label. */
2384 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2386 /* Create the label htab for the function on demand. */
2388 named_labels = htab_create_ggc (13, named_label_entry_hash,
2389 named_label_entry_eq, NULL);
2391 /* Record this label on the list of labels used in this function.
2392 We do this before calling make_label_decl so that we get the
2393 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2394 ent = GGC_CNEW (struct named_label_entry);
2395 ent->label_decl = decl;
2397 slot = htab_find_slot (named_labels, ent, INSERT);
2398 gcc_assert (*slot == NULL);
2404 /* Look for a label named ID in the current function. If one cannot
2405 be found, create one. (We keep track of used, but undefined,
2406 labels, and complain about them at the end of a function.) */
2409 lookup_label (tree id)
2413 timevar_push (TV_NAME_LOOKUP);
2414 /* You can't use labels at global scope. */
2415 if (current_function_decl == NULL_TREE)
2417 error ("label %qE referenced outside of any function", id);
2418 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2421 /* See if we've already got this label. */
2422 decl = IDENTIFIER_LABEL_VALUE (id);
2423 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2424 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2426 decl = make_label_decl (id, /*local_p=*/0);
2427 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2430 /* Declare a local label named ID. */
2433 declare_local_label (tree id)
2437 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2438 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2439 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2440 current_binding_level->shadowed_labels);
2441 current_binding_level->shadowed_labels = shadow;
2443 decl = make_label_decl (id, /*local_p=*/1);
2444 TREE_VALUE (shadow) = decl;
2449 /* Returns nonzero if it is ill-formed to jump past the declaration of
2450 DECL. Returns 2 if it's also a real problem. */
2453 decl_jump_unsafe (tree decl)
2455 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2456 || TREE_TYPE (decl) == error_mark_node)
2459 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2460 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2463 if (pod_type_p (TREE_TYPE (decl)))
2466 /* The POD stuff is just pedantry; why should it matter if the class
2467 contains a field of pointer to member type? */
2471 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2474 identify_goto (tree decl, const location_t *locus)
2477 permerror (input_location, "jump to label %qD", decl);
2479 permerror (input_location, "jump to case label");
2481 permerror (input_location, "%H from here", locus);
2484 /* Check that a single previously seen jump to a newly defined label
2485 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2486 the jump context; NAMES are the names in scope in LEVEL at the jump
2487 context; LOCUS is the source position of the jump or 0. Returns
2488 true if all is well. */
2491 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2492 bool exited_omp, const location_t *locus)
2494 struct cp_binding_level *b;
2495 bool identified = false, saw_eh = false, saw_omp = false;
2499 identify_goto (decl, locus);
2500 error (" exits OpenMP structured block");
2501 identified = saw_omp = true;
2504 for (b = current_binding_level; b ; b = b->level_chain)
2506 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2508 for (new_decls = b->names; new_decls != old_decls;
2509 new_decls = TREE_CHAIN (new_decls))
2511 int problem = decl_jump_unsafe (new_decls);
2517 identify_goto (decl, locus);
2521 error (" crosses initialization of %q+#D", new_decls);
2523 permerror (input_location, " enters scope of non-POD %q+#D", new_decls);
2528 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2532 identify_goto (decl, locus);
2535 if (b->kind == sk_try)
2536 error (" enters try block");
2538 error (" enters catch block");
2541 if (b->kind == sk_omp && !saw_omp)
2545 identify_goto (decl, locus);
2548 error (" enters OpenMP structured block");
2557 check_previous_goto (tree decl, struct named_label_use_entry *use)
2559 check_previous_goto_1 (decl, use->binding_level,
2560 use->names_in_scope, use->in_omp_scope,
2561 &use->o_goto_locus);
2565 check_switch_goto (struct cp_binding_level* level)
2567 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2570 /* Check that a new jump to a label DECL is OK. Called by
2571 finish_goto_stmt. */
2574 check_goto (tree decl)
2576 struct named_label_entry *ent, dummy;
2577 bool saw_catch = false, identified = false;
2580 /* We can't know where a computed goto is jumping.
2581 So we assume that it's OK. */
2582 if (TREE_CODE (decl) != LABEL_DECL)
2585 /* We didn't record any information about this label when we created it,
2586 and there's not much point since it's trivial to analyze as a return. */
2587 if (decl == cdtor_label)
2590 dummy.label_decl = decl;
2591 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2592 gcc_assert (ent != NULL);
2594 /* If the label hasn't been defined yet, defer checking. */
2595 if (! DECL_INITIAL (decl))
2597 struct named_label_use_entry *new_use;
2599 /* Don't bother creating another use if the last goto had the
2600 same data, and will therefore create the same set of errors. */
2602 && ent->uses->names_in_scope == current_binding_level->names)
2605 new_use = GGC_NEW (struct named_label_use_entry);
2606 new_use->binding_level = current_binding_level;
2607 new_use->names_in_scope = current_binding_level->names;
2608 new_use->o_goto_locus = input_location;
2609 new_use->in_omp_scope = false;
2611 new_use->next = ent->uses;
2612 ent->uses = new_use;
2616 if (ent->in_try_scope || ent->in_catch_scope
2617 || ent->in_omp_scope || ent->bad_decls)
2619 permerror (input_location, "jump to label %q+D", decl);
2620 permerror (input_location, " from here");
2624 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2626 tree b = TREE_VALUE (bad);
2627 int u = decl_jump_unsafe (b);
2629 if (u > 1 && DECL_ARTIFICIAL (b))
2631 /* Can't skip init of __exception_info. */
2632 error ("%J enters catch block", b);
2636 error (" skips initialization of %q+#D", b);
2638 permerror (input_location, " enters scope of non-POD %q+#D", b);
2641 if (ent->in_try_scope)
2642 error (" enters try block");
2643 else if (ent->in_catch_scope && !saw_catch)
2644 error (" enters catch block");
2646 if (ent->in_omp_scope)
2647 error (" enters OpenMP structured block");
2648 else if (flag_openmp)
2650 struct cp_binding_level *b;
2651 for (b = current_binding_level; b ; b = b->level_chain)
2653 if (b == ent->binding_level)
2655 if (b->kind == sk_omp)
2659 permerror (input_location, "jump to label %q+D", decl);
2660 permerror (input_location, " from here");
2663 error (" exits OpenMP structured block");
2670 /* Check that a return is ok wrt OpenMP structured blocks.
2671 Called by finish_return_stmt. Returns true if all is well. */
2674 check_omp_return (void)
2676 struct cp_binding_level *b;
2677 for (b = current_binding_level; b ; b = b->level_chain)
2678 if (b->kind == sk_omp)
2680 error ("invalid exit from OpenMP structured block");
2686 /* Define a label, specifying the location in the source file.
2687 Return the LABEL_DECL node for the label. */
2690 define_label (location_t location, tree name)
2692 struct named_label_entry *ent, dummy;
2693 struct cp_binding_level *p;
2696 timevar_push (TV_NAME_LOOKUP);
2698 decl = lookup_label (name);
2700 dummy.label_decl = decl;
2701 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2702 gcc_assert (ent != NULL);
2704 /* After labels, make any new cleanups in the function go into their
2705 own new (temporary) binding contour. */
2706 for (p = current_binding_level;
2707 p->kind != sk_function_parms;
2709 p->more_cleanups_ok = 0;
2711 if (name == get_identifier ("wchar_t"))
2712 permerror (input_location, "label named wchar_t");
2714 if (DECL_INITIAL (decl) != NULL_TREE)
2716 error ("duplicate label %qD", decl);
2717 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2721 struct named_label_use_entry *use;
2723 /* Mark label as having been defined. */
2724 DECL_INITIAL (decl) = error_mark_node;
2725 /* Say where in the source. */
2726 DECL_SOURCE_LOCATION (decl) = location;
2728 ent->binding_level = current_binding_level;
2729 ent->names_in_scope = current_binding_level->names;
2731 for (use = ent->uses; use ; use = use->next)
2732 check_previous_goto (decl, use);
2736 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2741 struct cp_binding_level *level;
2742 struct cp_switch *next;
2743 /* The SWITCH_STMT being built. */
2745 /* A splay-tree mapping the low element of a case range to the high
2746 element, or NULL_TREE if there is no high element. Used to
2747 determine whether or not a new case label duplicates an old case
2748 label. We need a tree, rather than simply a hash table, because
2749 of the GNU case range extension. */
2753 /* A stack of the currently active switch statements. The innermost
2754 switch statement is on the top of the stack. There is no need to
2755 mark the stack for garbage collection because it is only active
2756 during the processing of the body of a function, and we never
2757 collect at that point. */
2759 static struct cp_switch *switch_stack;
2761 /* Called right after a switch-statement condition is parsed.
2762 SWITCH_STMT is the switch statement being parsed. */
2765 push_switch (tree switch_stmt)
2767 struct cp_switch *p = XNEW (struct cp_switch);
2768 p->level = current_binding_level;
2769 p->next = switch_stack;
2770 p->switch_stmt = switch_stmt;
2771 p->cases = splay_tree_new (case_compare, NULL, NULL);
2778 struct cp_switch *cs = switch_stack;
2779 location_t switch_location;
2781 /* Emit warnings as needed. */
2782 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2783 switch_location = EXPR_LOCATION (cs->switch_stmt);
2785 switch_location = input_location;
2786 if (!processing_template_decl)
2787 c_do_switch_warnings (cs->cases, switch_location,
2788 SWITCH_STMT_TYPE (cs->switch_stmt),
2789 SWITCH_STMT_COND (cs->switch_stmt));
2791 splay_tree_delete (cs->cases);
2792 switch_stack = switch_stack->next;
2796 /* Note that we've seen a definition of a case label, and complain if this
2797 is a bad place for one. */
2800 finish_case_label (tree low_value, tree high_value)
2803 struct cp_binding_level *p;
2805 if (processing_template_decl)
2809 /* For templates, just add the case label; we'll do semantic
2810 analysis at instantiation-time. */
2811 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2812 return add_stmt (build_case_label (low_value, high_value, label));
2815 /* Find the condition on which this switch statement depends. */
2816 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2817 if (cond && TREE_CODE (cond) == TREE_LIST)
2818 cond = TREE_VALUE (cond);
2820 if (!check_switch_goto (switch_stack->level))
2821 return error_mark_node;
2823 r = c_add_case_label (switch_stack->cases, cond,
2824 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2825 low_value, high_value);
2827 /* After labels, make any new cleanups in the function go into their
2828 own new (temporary) binding contour. */
2829 for (p = current_binding_level;
2830 p->kind != sk_function_parms;
2832 p->more_cleanups_ok = 0;
2837 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2840 typename_hash (const void* k)
2843 const_tree const t = (const_tree) k;
2845 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2846 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2851 typedef struct typename_info {
2859 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2860 really of type `typename_info*' */
2863 typename_compare (const void * k1, const void * k2)
2865 const_tree const t1 = (const_tree) k1;
2866 const typename_info *const t2 = (const typename_info *) k2;
2868 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2869 && TYPE_CONTEXT (t1) == t2->scope
2870 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2871 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2872 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2875 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2876 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2878 Returns the new TYPENAME_TYPE. */
2880 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2883 build_typename_type (tree context, tree name, tree fullname,
2884 enum tag_types tag_type)
2892 if (typename_htab == NULL)
2893 typename_htab = htab_create_ggc (61, &typename_hash,
2894 &typename_compare, NULL);
2896 ti.scope = FROB_CONTEXT (context);
2898 ti.template_id = fullname;
2899 ti.enum_p = tag_type == enum_type;
2900 ti.class_p = (tag_type == class_type
2901 || tag_type == record_type
2902 || tag_type == union_type);
2903 hash = (htab_hash_pointer (ti.scope)
2904 ^ htab_hash_pointer (ti.name));
2906 /* See if we already have this type. */
2907 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2912 /* Build the TYPENAME_TYPE. */
2913 t = cxx_make_type (TYPENAME_TYPE);
2914 TYPE_CONTEXT (t) = ti.scope;
2915 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2916 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2917 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2919 /* Build the corresponding TYPE_DECL. */
2920 d = build_decl (TYPE_DECL, name, t);
2921 TYPE_NAME (TREE_TYPE (d)) = d;
2922 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2923 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2924 DECL_ARTIFICIAL (d) = 1;
2926 /* Store it in the hash table. */
2929 /* TYPENAME_TYPEs must always be compared structurally, because
2930 they may or may not resolve down to another type depending on
2931 the currently open classes. */
2932 SET_TYPE_STRUCTURAL_EQUALITY (t);
2938 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2939 provided to name the type. Returns an appropriate type, unless an
2940 error occurs, in which case error_mark_node is returned. If we
2941 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2942 return that, rather than the _TYPE it corresponds to, in other
2943 cases we look through the type decl. If TF_ERROR is set, complain
2944 about errors, otherwise be quiet. */
2947 make_typename_type (tree context, tree name, enum tag_types tag_type,
2948 tsubst_flags_t complain)
2954 if (name == error_mark_node
2955 || context == NULL_TREE
2956 || context == error_mark_node)
2957 return error_mark_node;
2961 if (!(TYPE_LANG_SPECIFIC (name)
2962 && (CLASSTYPE_IS_TEMPLATE (name)
2963 || CLASSTYPE_USE_TEMPLATE (name))))
2964 name = TYPE_IDENTIFIER (name);
2966 /* Create a TEMPLATE_ID_EXPR for the type. */
2967 name = build_nt (TEMPLATE_ID_EXPR,
2968 CLASSTYPE_TI_TEMPLATE (name),
2969 CLASSTYPE_TI_ARGS (name));
2971 else if (TREE_CODE (name) == TYPE_DECL)
2972 name = DECL_NAME (name);
2976 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2978 name = TREE_OPERAND (name, 0);
2979 if (TREE_CODE (name) == TEMPLATE_DECL)
2980 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2981 else if (TREE_CODE (name) == OVERLOAD)
2983 error ("%qD is not a type", name);
2984 return error_mark_node;
2987 if (TREE_CODE (name) == TEMPLATE_DECL)
2989 error ("%qD used without template parameters", name);
2990 return error_mark_node;
2992 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2993 gcc_assert (TYPE_P (context));
2995 if (!MAYBE_CLASS_TYPE_P (context))
2997 if (complain & tf_error)
2998 error ("%q#T is not a class", context);
2999 return error_mark_node;
3002 /* When the CONTEXT is a dependent type, NAME could refer to a
3003 dependent base class of CONTEXT. But look inside it anyway
3004 if CONTEXT is a currently open scope, in case it refers to a
3005 member of the current instantiation or a non-dependent base;
3006 lookup will stop when we hit a dependent base. */
3007 if (!dependent_scope_p (context))
3008 /* We should only set WANT_TYPE when we're a nested typename type.
3009 Then we can give better diagnostics if we find a non-type. */
3010 t = lookup_field (context, name, 0, /*want_type=*/true);
3014 if (!t && dependent_type_p (context))
3015 return build_typename_type (context, name, fullname, tag_type);
3017 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3021 if (complain & tf_error)
3022 error (want_template ? "no class template named %q#T in %q#T"
3023 : "no type named %q#T in %q#T", name, context);
3024 return error_mark_node;
3027 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3029 if (complain & tf_error)
3030 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3032 return error_mark_node;
3034 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3036 if (complain & tf_error)
3037 error ("%<typename %T::%D%> names %q#T, which is not a type",
3039 return error_mark_node;
3042 if (complain & tf_error)
3043 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3046 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3048 /*entering_scope=*/0,
3049 tf_warning_or_error | tf_user);
3051 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3057 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3058 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3059 in which case error_mark_node is returned.
3061 If PARM_LIST is non-NULL, also make sure that the template parameter
3062 list of TEMPLATE_DECL matches.
3064 If COMPLAIN zero, don't complain about any errors that occur. */
3067 make_unbound_class_template (tree context, tree name, tree parm_list,
3068 tsubst_flags_t complain)
3074 name = TYPE_IDENTIFIER (name);
3075 else if (DECL_P (name))
3076 name = DECL_NAME (name);
3077 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3079 if (!dependent_type_p (context)
3080 || currently_open_class (context))
3082 tree tmpl = NULL_TREE;
3084 if (MAYBE_CLASS_TYPE_P (context))
3085 tmpl = lookup_field (context, name, 0, false);
3087 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3089 if (complain & tf_error)
3090 error ("no class template named %q#T in %q#T", name, context);
3091 return error_mark_node;
3095 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3097 if (complain & tf_error)
3099 error ("template parameters do not match template");
3100 error ("%q+D declared here", tmpl);
3102 return error_mark_node;
3105 if (complain & tf_error)
3106 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3111 /* Build the UNBOUND_CLASS_TEMPLATE. */
3112 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3113 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3114 TREE_TYPE (t) = NULL_TREE;
3115 SET_TYPE_STRUCTURAL_EQUALITY (t);
3117 /* Build the corresponding TEMPLATE_DECL. */
3118 d = build_decl (TEMPLATE_DECL, name, t);
3119 TYPE_NAME (TREE_TYPE (d)) = d;
3120 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3121 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3122 DECL_ARTIFICIAL (d) = 1;
3123 DECL_TEMPLATE_PARMS (d) = parm_list;
3130 /* Push the declarations of builtin types into the namespace.
3131 RID_INDEX is the index of the builtin type in the array
3132 RID_POINTERS. NAME is the name used when looking up the builtin
3133 type. TYPE is the _TYPE node for the builtin type. */
3136 record_builtin_type (enum rid rid_index,
3140 tree rname = NULL_TREE, tname = NULL_TREE;
3141 tree tdecl = NULL_TREE;
3143 if ((int) rid_index < (int) RID_MAX)
3144 rname = ridpointers[(int) rid_index];
3146 tname = get_identifier (name);
3148 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3149 eliminated. Built-in types should not be looked up name; their
3150 names are keywords that the parser can recognize. However, there
3151 is code in c-common.c that uses identifier_global_value to look
3152 up built-in types by name. */
3155 tdecl = build_decl (TYPE_DECL, tname, type);
3156 DECL_ARTIFICIAL (tdecl) = 1;
3157 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3163 tdecl = build_decl (TYPE_DECL, rname, type);
3164 DECL_ARTIFICIAL (tdecl) = 1;
3166 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3169 if (!TYPE_NAME (type))
3170 TYPE_NAME (type) = tdecl;
3173 debug_hooks->type_decl (tdecl, 0);
3176 /* Record one of the standard Java types.
3177 * Declare it as having the given NAME.
3178 * If SIZE > 0, it is the size of one of the integral types;
3179 * otherwise it is the negative of the size of one of the other types. */
3182 record_builtin_java_type (const char* name, int size)
3186 type = build_nonstandard_integer_type (size, 0);
3187 else if (size > -32)
3190 /* "__java_char" or ""__java_boolean". */
3191 type = build_nonstandard_integer_type (-size, 1);
3192 /* Get the signed type cached and attached to the unsigned type,
3193 so it doesn't get garbage-collected at "random" times,
3194 causing potential codegen differences out of different UIDs
3195 and different alias set numbers. */
3196 stype = build_nonstandard_integer_type (-size, 0);
3197 TREE_CHAIN (type) = stype;
3198 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3201 { /* "__java_float" or ""__java_double". */
3202 type = make_node (REAL_TYPE);
3203 TYPE_PRECISION (type) = - size;
3206 record_builtin_type (RID_MAX, name, type);
3207 decl = TYPE_NAME (type);
3209 /* Suppress generate debug symbol entries for these types,
3210 since for normal C++ they are just clutter.
3211 However, push_lang_context undoes this if extern "Java" is seen. */
3212 DECL_IGNORED_P (decl) = 1;
3214 TYPE_FOR_JAVA (type) = 1;
3218 /* Push a type into the namespace so that the back ends ignore it. */
3221 record_unknown_type (tree type, const char* name)
3223 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3224 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3225 DECL_IGNORED_P (decl) = 1;
3226 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3227 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3228 TYPE_ALIGN (type) = 1;
3229 TYPE_USER_ALIGN (type) = 0;
3230 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3233 /* A string for which we should create an IDENTIFIER_NODE at
3236 typedef struct predefined_identifier
3238 /* The name of the identifier. */
3239 const char *const name;
3240 /* The place where the IDENTIFIER_NODE should be stored. */
3242 /* Nonzero if this is the name of a constructor or destructor. */
3243 const int ctor_or_dtor_p;
3244 } predefined_identifier;
3246 /* Create all the predefined identifiers. */
3249 initialize_predefined_identifiers (void)
3251 const predefined_identifier *pid;
3253 /* A table of identifiers to create at startup. */
3254 static const predefined_identifier predefined_identifiers[] = {
3255 { "C++", &lang_name_cplusplus, 0 },
3256 { "C", &lang_name_c, 0 },
3257 { "Java", &lang_name_java, 0 },
3258 /* Some of these names have a trailing space so that it is
3259 impossible for them to conflict with names written by users. */
3260 { "__ct ", &ctor_identifier, 1 },
3261 { "__base_ctor ", &base_ctor_identifier, 1 },
3262 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3263 { "__dt ", &dtor_identifier, 1 },
3264 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3265 { "__base_dtor ", &base_dtor_identifier, 1 },
3266 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3267 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3268 { "nelts", &nelts_identifier, 0 },
3269 { THIS_NAME, &this_identifier, 0 },
3270 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3271 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3272 { "_vptr", &vptr_identifier, 0 },
3273 { "__vtt_parm", &vtt_parm_identifier, 0 },
3274 { "::", &global_scope_name, 0 },
3275 { "std", &std_identifier, 0 },
3279 for (pid = predefined_identifiers; pid->name; ++pid)
3281 *pid->node = get_identifier (pid->name);
3282 if (pid->ctor_or_dtor_p)
3283 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3287 /* Create the predefined scalar types of C,
3288 and some nodes representing standard constants (0, 1, (void *)0).
3289 Initialize the global binding level.
3290 Make definitions for built-in primitive functions. */
3293 cxx_init_decl_processing (void)
3296 tree void_ftype_ptr;
3298 build_common_tree_nodes (flag_signed_char, false);
3300 /* Create all the identifiers we need. */
3301 initialize_predefined_identifiers ();
3303 /* Create the global variables. */
3304 push_to_top_level ();
3306 current_function_decl = NULL_TREE;
3307 current_binding_level = NULL;
3308 /* Enter the global namespace. */
3309 gcc_assert (global_namespace == NULL_TREE);
3310 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3312 TREE_PUBLIC (global_namespace) = 1;
3313 begin_scope (sk_namespace, global_namespace);
3315 current_lang_name = NULL_TREE;
3317 if (flag_visibility_ms_compat)
3318 default_visibility = VISIBILITY_HIDDEN;
3321 current_lang_name = lang_name_c;
3323 /* Create the `std' namespace. */
3324 push_namespace (std_identifier);
3325 std_node = current_namespace;
3328 c_common_nodes_and_builtins ();
3330 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3331 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3332 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3333 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3334 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3335 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3336 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3337 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3339 integer_two_node = build_int_cst (NULL_TREE, 2);
3340 integer_three_node = build_int_cst (NULL_TREE, 3);
3342 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3343 truthvalue_type_node = boolean_type_node;
3344 truthvalue_false_node = boolean_false_node;
3345 truthvalue_true_node = boolean_true_node;
3347 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3350 record_builtin_type (RID_MAX, NULL, string_type_node);
3353 delta_type_node = ptrdiff_type_node;
3354 vtable_index_type = ptrdiff_type_node;
3356 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3357 void_ftype = build_function_type (void_type_node, void_list_node);
3358 void_ftype_ptr = build_function_type (void_type_node,
3359 tree_cons (NULL_TREE,
3363 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3365 /* C++ extensions */
3367 unknown_type_node = make_node (UNKNOWN_TYPE);
3368 record_unknown_type (unknown_type_node, "unknown type");
3370 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3371 TREE_TYPE (unknown_type_node) = unknown_type_node;
3373 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3375 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3376 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3378 init_list_type_node = make_node (UNKNOWN_TYPE);
3379 record_unknown_type (init_list_type_node, "init list");
3382 /* Make sure we get a unique function type, so we can give
3383 its pointer type a name. (This wins for gdb.) */
3384 tree vfunc_type = make_node (FUNCTION_TYPE);
3385 TREE_TYPE (vfunc_type) = integer_type_node;
3386 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3387 layout_type (vfunc_type);
3389 vtable_entry_type = build_pointer_type (vfunc_type);
3391 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3394 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3395 layout_type (vtbl_type_node);
3396 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3397 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3398 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3399 layout_type (vtbl_ptr_type_node);
3400 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3402 push_namespace (get_identifier ("__cxxabiv1"));
3403 abi_node = current_namespace;
3406 global_type_node = make_node (LANG_TYPE);
3407 record_unknown_type (global_type_node, "global type");
3410 current_lang_name = lang_name_cplusplus;
3414 tree bad_alloc_type_node;
3415 tree bad_alloc_decl;
3416 tree newtype, deltype;
3417 tree ptr_ftype_sizetype;
3419 push_namespace (std_identifier);
3420 bad_alloc_id = get_identifier ("bad_alloc");
3421 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3422 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3424 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3425 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3426 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3430 = build_function_type (ptr_type_node,
3431 tree_cons (NULL_TREE,
3434 newtype = build_exception_variant
3435 (ptr_ftype_sizetype, add_exception_specifier
3436 (NULL_TREE, bad_alloc_type_node, -1));
3437 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3438 push_cp_library_fn (NEW_EXPR, newtype);
3439 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3440 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3441 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3445 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3447 /* Perform other language dependent initializations. */
3448 init_class_processing ();
3449 init_rtti_processing ();
3451 if (flag_exceptions)
3452 init_exception_processing ();
3454 if (! supports_one_only ())
3457 make_fname_decl = cp_make_fname_decl;
3458 start_fname_decls ();
3460 /* Show we use EH for cleanups. */
3461 if (flag_exceptions)
3462 using_eh_for_cleanups ();
3465 /* Generate an initializer for a function naming variable from
3466 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3467 filled in with the type of the init. */
3470 cp_fname_init (const char* name, tree *type_p)
3472 tree domain = NULL_TREE;
3474 tree init = NULL_TREE;
3479 length = strlen (name);
3480 domain = build_index_type (size_int (length));
3481 init = build_string (length + 1, name);
3484 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3485 type = build_cplus_array_type (type, domain);
3490 TREE_TYPE (init) = type;
3492 init = error_mark_node;
3497 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3498 decl, NAME is the initialization string and TYPE_DEP indicates whether
3499 NAME depended on the type of the function. We make use of that to detect
3500 __PRETTY_FUNCTION__ inside a template fn. This is being done
3501 lazily at the point of first use, so we mustn't push the decl now. */
3504 cp_make_fname_decl (tree id, int type_dep)
3506 const char *const name = (type_dep && processing_template_decl
3507 ? NULL : fname_as_string (type_dep));
3509 tree init = cp_fname_init (name, &type);
3510 tree decl = build_decl (VAR_DECL, id, type);
3513 free (CONST_CAST (char *, name));
3515 /* As we're using pushdecl_with_scope, we must set the context. */
3516 DECL_CONTEXT (decl) = current_function_decl;
3517 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3519 TREE_STATIC (decl) = 1;
3520 TREE_READONLY (decl) = 1;
3521 DECL_ARTIFICIAL (decl) = 1;
3523 TREE_USED (decl) = 1;
3525 if (current_function_decl)
3527 struct cp_binding_level *b = current_binding_level;
3528 while (b->level_chain->kind != sk_function_parms)
3530 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3531 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3532 LOOKUP_ONLYCONVERTING);
3535 pushdecl_top_level_and_finish (decl, init);
3541 builtin_function_1 (tree decl, tree context, bool is_global)
3543 tree id = DECL_NAME (decl);
3544 const char *name = IDENTIFIER_POINTER (id);
3546 retrofit_lang_decl (decl);
3548 /* All nesting of C++ functions is lexical; there is never a "static
3549 chain" in the sense of GNU C nested functions. */
3550 DECL_NO_STATIC_CHAIN (decl) = 1;
3552 DECL_ARTIFICIAL (decl) = 1;
3553 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3554 SET_DECL_LANGUAGE (decl, lang_c);
3555 /* Runtime library routines are, by definition, available in an
3556 external shared object. */
3557 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3558 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3560 DECL_CONTEXT (decl) = context;
3563 pushdecl_top_level (decl);
3567 /* A function in the user's namespace should have an explicit
3568 declaration before it is used. Mark the built-in function as
3569 anticipated but not actually declared. */
3570 if (name[0] != '_' || name[1] != '_')
3571 DECL_ANTICIPATED (decl) = 1;
3572 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3574 size_t len = strlen (name);
3576 /* Treat __*_chk fortification functions as anticipated as well,
3577 unless they are __builtin_*. */
3578 if (len > strlen ("___chk")
3579 && memcmp (name + len - strlen ("_chk"),
3580 "_chk", strlen ("_chk") + 1) == 0)
3581 DECL_ANTICIPATED (decl) = 1;
3588 cxx_builtin_function (tree decl)
3590 tree id = DECL_NAME (decl);
3591 const char *name = IDENTIFIER_POINTER (id);
3592 /* All builtins that don't begin with an '_' should additionally
3593 go in the 'std' namespace. */
3596 tree decl2 = copy_node(decl);
3597 push_namespace (std_identifier);
3598 builtin_function_1 (decl2, std_node, false);
3602 return builtin_function_1 (decl, NULL_TREE, false);
3605 /* Like cxx_builtin_function, but guarantee the function is added to the global
3606 scope. This is to allow function specific options to add new machine
3607 dependent builtins when the target ISA changes via attribute((target(...)))
3608 which saves space on program startup if the program does not use non-generic
3612 cxx_builtin_function_ext_scope (tree decl)
3615 tree id = DECL_NAME (decl);
3616 const char *name = IDENTIFIER_POINTER (id);
3617 /* All builtins that don't begin with an '_' should additionally
3618 go in the 'std' namespace. */
3621 tree decl2 = copy_node(decl);
3622 push_namespace (std_identifier);
3623 builtin_function_1 (decl2, std_node, true);
3627 return builtin_function_1 (decl, NULL_TREE, true);
3630 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3631 function. Not called directly. */
3634 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3636 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3637 DECL_EXTERNAL (fn) = 1;
3638 TREE_PUBLIC (fn) = 1;
3639 DECL_ARTIFICIAL (fn) = 1;
3640 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3641 SET_DECL_LANGUAGE (fn, lang_c);
3642 /* Runtime library routines are, by definition, available in an
3643 external shared object. */
3644 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3645 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3649 /* Returns the _DECL for a library function with C linkage.
3650 We assume that such functions never throw; if this is incorrect,
3651 callers should unset TREE_NOTHROW. */
3654 build_library_fn (tree name, tree type)
3656 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3657 TREE_NOTHROW (fn) = 1;
3661 /* Returns the _DECL for a library function with C++ linkage. */
3664 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3666 tree fn = build_library_fn_1 (name, operator_code, type);
3667 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3668 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3669 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3673 /* Like build_library_fn, but takes a C string instead of an
3677 build_library_fn_ptr (const char* name, tree type)
3679 return build_library_fn (get_identifier (name), type);
3682 /* Like build_cp_library_fn, but takes a C string instead of an
3686 build_cp_library_fn_ptr (const char* name, tree type)
3688 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3691 /* Like build_library_fn, but also pushes the function so that we will
3692 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3693 may throw exceptions listed in RAISES. */
3696 push_library_fn (tree name, tree type, tree raises)
3701 type = build_exception_variant (type, raises);
3703 fn = build_library_fn (name, type);
3704 pushdecl_top_level (fn);
3708 /* Like build_cp_library_fn, but also pushes the function so that it
3709 will be found by normal lookup. */
3712 push_cp_library_fn (enum tree_code operator_code, tree type)
3714 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3721 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3725 push_void_library_fn (tree name, tree parmtypes)
3727 tree type = build_function_type (void_type_node, parmtypes);
3728 return push_library_fn (name, type, NULL_TREE);
3731 /* Like push_library_fn, but also note that this function throws
3732 and does not return. Used for __throw_foo and the like. */
3735 push_throw_library_fn (tree name, tree type)
3737 tree fn = push_library_fn (name, type, NULL_TREE);
3738 TREE_THIS_VOLATILE (fn) = 1;
3739 TREE_NOTHROW (fn) = 0;
3743 /* When we call finish_struct for an anonymous union, we create
3744 default copy constructors and such. But, an anonymous union
3745 shouldn't have such things; this function undoes the damage to the
3746 anonymous union type T.
3748 (The reason that we create the synthesized methods is that we don't
3749 distinguish `union { int i; }' from `typedef union { int i; } U'.
3750 The first is an anonymous union; the second is just an ordinary
3754 fixup_anonymous_aggr (tree t)
3758 /* Wipe out memory of synthesized methods. */
3759 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3760 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3761 TYPE_HAS_INIT_REF (t) = 0;
3762 TYPE_HAS_CONST_INIT_REF (t) = 0;
3763 TYPE_HAS_ASSIGN_REF (t) = 0;
3764 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3766 /* Splice the implicitly generated functions out of the TYPE_METHODS
3768 q = &TYPE_METHODS (t);
3771 if (DECL_ARTIFICIAL (*q))
3772 *q = TREE_CHAIN (*q);
3774 q = &TREE_CHAIN (*q);
3777 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3778 if (TYPE_METHODS (t))
3780 tree decl = TYPE_MAIN_DECL (t);
3782 if (TREE_CODE (t) != UNION_TYPE)
3783 error ("%Jan anonymous struct cannot have function members", decl);
3785 error ("%Jan anonymous union cannot have function members", decl);
3788 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3789 assignment operators (because they cannot have these methods themselves).
3790 For anonymous unions this is already checked because they are not allowed
3791 in any union, otherwise we have to check it. */
3792 if (TREE_CODE (t) != UNION_TYPE)
3796 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3797 if (TREE_CODE (field) == FIELD_DECL)
3799 type = TREE_TYPE (field);
3800 if (CLASS_TYPE_P (type))
3802 if (TYPE_NEEDS_CONSTRUCTING (type))
3803 error ("member %q+#D with constructor not allowed "
3804 "in anonymous aggregate", field);
3805 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3806 error ("member %q+#D with destructor not allowed "
3807 "in anonymous aggregate", field);
3808 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3809 error ("member %q+#D with copy assignment operator "
3810 "not allowed in anonymous aggregate", field);
3816 /* Make sure that a declaration with no declarator is well-formed, i.e.
3817 just declares a tagged type or anonymous union.
3819 Returns the type declared; or NULL_TREE if none. */
3822 check_tag_decl (cp_decl_specifier_seq *declspecs)
3824 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3825 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3826 /* If a class, struct, or enum type is declared by the DECLSPECS
3827 (i.e, if a class-specifier, enum-specifier, or non-typename
3828 elaborated-type-specifier appears in the DECLSPECS),
3829 DECLARED_TYPE is set to the corresponding type. */
3830 tree declared_type = NULL_TREE;
3831 bool error_p = false;
3833 if (declspecs->multiple_types_p)
3834 error ("multiple types in one declaration");
3835 else if (declspecs->redefined_builtin_type)
3837 if (!in_system_header)
3838 permerror (input_location, "redeclaration of C++ built-in type %qT",
3839 declspecs->redefined_builtin_type);
3844 && TYPE_P (declspecs->type)
3845 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3846 && MAYBE_CLASS_TYPE_P (declspecs->type))
3847 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3848 declared_type = declspecs->type;
3849 else if (declspecs->type == error_mark_node)
3851 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3852 permerror (input_location, "declaration does not declare anything");
3853 /* Check for an anonymous union. */
3854 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3855 && TYPE_ANONYMOUS_P (declared_type))
3857 /* 7/3 In a simple-declaration, the optional init-declarator-list
3858 can be omitted only when declaring a class (clause 9) or
3859 enumeration (7.2), that is, when the decl-specifier-seq contains
3860 either a class-specifier, an elaborated-type-specifier with
3861 a class-key (9.1), or an enum-specifier. In these cases and
3862 whenever a class-specifier or enum-specifier is present in the
3863 decl-specifier-seq, the identifiers in these specifiers are among
3864 the names being declared by the declaration (as class-name,
3865 enum-names, or enumerators, depending on the syntax). In such
3866 cases, and except for the declaration of an unnamed bit-field (9.6),
3867 the decl-specifier-seq shall introduce one or more names into the
3868 program, or shall redeclare a name introduced by a previous
3869 declaration. [Example:
3870 enum { }; // ill-formed
3871 typedef class { }; // ill-formed
3875 error ("missing type-name in typedef-declaration");
3878 /* Anonymous unions are objects, so they can have specifiers. */;
3879 SET_ANON_AGGR_TYPE_P (declared_type);
3881 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3882 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3887 if (declspecs->specs[(int)ds_inline]
3888 || declspecs->specs[(int)ds_virtual])
3889 error ("%qs can only be specified for functions",
3890 declspecs->specs[(int)ds_inline]
3891 ? "inline" : "virtual");
3893 && (!current_class_type
3894 || current_scope () != current_class_type))
3895 error ("%<friend%> can only be specified inside a class");
3896 else if (declspecs->specs[(int)ds_explicit])
3897 error ("%<explicit%> can only be specified for constructors");
3898 else if (declspecs->storage_class)
3899 error ("a storage class can only be specified for objects "
3901 else if (declspecs->specs[(int)ds_const]
3902 || declspecs->specs[(int)ds_volatile]
3903 || declspecs->specs[(int)ds_restrict]
3904 || declspecs->specs[(int)ds_thread])
3905 error ("qualifiers can only be specified for objects "
3907 else if (saw_typedef)
3908 warning (0, "%<typedef%> was ignored in this declaration");
3911 return declared_type;
3914 /* Called when a declaration is seen that contains no names to declare.
3915 If its type is a reference to a structure, union or enum inherited
3916 from a containing scope, shadow that tag name for the current scope
3917 with a forward reference.
3918 If its type defines a new named structure or union
3919 or defines an enum, it is valid but we need not do anything here.
3920 Otherwise, it is an error.
3922 C++: may have to grok the declspecs to learn about static,
3923 complain for anonymous unions.
3925 Returns the TYPE declared -- or NULL_TREE if none. */
3928 shadow_tag (cp_decl_specifier_seq *declspecs)
3930 tree t = check_tag_decl (declspecs);
3935 if (declspecs->attributes)
3937 warning (0, "attribute ignored in declaration of %q+#T", t);
3938 warning (0, "attribute for %q+#T must follow the %qs keyword",
3939 t, class_key_or_enum_as_string (t));
3943 if (maybe_process_partial_specialization (t) == error_mark_node)
3946 /* This is where the variables in an anonymous union are
3947 declared. An anonymous union declaration looks like:
3949 because there is no declarator after the union, the parser
3950 sends that declaration here. */
3951 if (ANON_AGGR_TYPE_P (t))
3953 fixup_anonymous_aggr (t);
3955 if (TYPE_FIELDS (t))
3957 tree decl = grokdeclarator (/*declarator=*/NULL,
3958 declspecs, NORMAL, 0, NULL);
3959 finish_anon_union (decl);
3966 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3969 groktypename (cp_decl_specifier_seq *type_specifiers,
3970 const cp_declarator *declarator)
3974 attrs = type_specifiers->attributes;
3975 type_specifiers->attributes = NULL_TREE;
3976 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3977 if (attrs && type != error_mark_node)
3979 if (CLASS_TYPE_P (type))
3980 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3981 "outside of definition", type);
3982 else if (MAYBE_CLASS_TYPE_P (type))
3983 /* A template type parameter or other dependent type. */
3984 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3985 "type %qT without an associated declaration", type);
3987 cplus_decl_attributes (&type, attrs, 0);
3992 /* Process a DECLARATOR for a function-scope variable declaration,
3993 namespace-scope variable declaration, or function declaration.
3994 (Function definitions go through start_function; class member
3995 declarations appearing in the body of the class go through
3996 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3997 If an error occurs, the error_mark_node is returned instead.
3999 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4000 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4001 for an explicitly defaulted function, or SD_DELETED for an explicitly
4002 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4003 implicitly initialized via a default constructor. ATTRIBUTES and
4004 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4005 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4006 set, the caller is responsible for calling pop_scope. */
4009 start_decl (const cp_declarator *declarator,
4010 cp_decl_specifier_seq *declspecs,
4013 tree prefix_attributes,
4014 tree *pushed_scope_p)
4022 *pushed_scope_p = NULL_TREE;
4024 /* An object declared as __attribute__((deprecated)) suppresses
4025 warnings of uses of other deprecated items. */
4026 if (lookup_attribute ("deprecated", attributes))
4027 deprecated_state = DEPRECATED_SUPPRESS;
4029 attributes = chainon (attributes, prefix_attributes);
4031 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4034 deprecated_state = DEPRECATED_NORMAL;
4036 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4037 || decl == error_mark_node)
4038 return error_mark_node;
4040 type = TREE_TYPE (decl);
4042 context = DECL_CONTEXT (decl);
4046 *pushed_scope_p = push_scope (context);
4048 /* We are only interested in class contexts, later. */
4049 if (TREE_CODE (context) == NAMESPACE_DECL)
4050 context = NULL_TREE;
4054 /* Is it valid for this decl to have an initializer at all?
4055 If not, set INITIALIZED to zero, which will indirectly
4056 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4057 switch (TREE_CODE (decl))
4060 error ("typedef %qD is initialized (use decltype instead)", decl);
4061 return error_mark_node;
4064 if (initialized == SD_DELETED)
4065 /* We'll handle the rest of the semantics later, but we need to
4066 set this now so it's visible to duplicate_decls. */
4067 DECL_DELETED_FN (decl) = 1;
4076 if (! toplevel_bindings_p ()
4077 && DECL_EXTERNAL (decl))
4078 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4080 DECL_EXTERNAL (decl) = 0;
4081 if (toplevel_bindings_p ())
4082 TREE_STATIC (decl) = 1;
4085 /* If this is a typedef that names the class for linkage purposes
4086 (7.1.3p8), apply any attributes directly to the type. */
4087 if (TREE_CODE (decl) == TYPE_DECL
4088 && TAGGED_TYPE_P (TREE_TYPE (decl))
4089 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4090 flags = ATTR_FLAG_TYPE_IN_PLACE;
4094 /* Set attributes here so if duplicate decl, will have proper attributes. */
4095 cplus_decl_attributes (&decl, attributes, flags);
4097 /* Dllimported symbols cannot be defined. Static data members (which
4098 can be initialized in-class and dllimported) go through grokfield,
4099 not here, so we don't need to exclude those decls when checking for
4101 if (initialized && DECL_DLLIMPORT_P (decl))
4103 error ("definition of %q#D is marked %<dllimport%>", decl);
4104 DECL_DLLIMPORT_P (decl) = 0;
4107 /* If #pragma weak was used, mark the decl weak now. */
4108 maybe_apply_pragma_weak (decl);
4110 if (TREE_CODE (decl) == FUNCTION_DECL
4111 && DECL_DECLARED_INLINE_P (decl)
4112 && DECL_UNINLINABLE (decl)
4113 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4114 warning (0, "inline function %q+D given attribute noinline", decl);
4116 if (context && COMPLETE_TYPE_P (complete_type (context)))
4118 if (TREE_CODE (decl) == VAR_DECL)
4120 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4121 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4122 error ("%q#D is not a static member of %q#T", decl, context);
4125 if (DECL_CONTEXT (field) != context)
4127 if (!same_type_p (DECL_CONTEXT (field), context))
4128 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4129 "to be defined as %<%T::%D%>",
4130 DECL_CONTEXT (field), DECL_NAME (decl),
4131 context, DECL_NAME (decl));
4132 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4134 if (processing_specialization
4135 && template_class_depth (context) == 0
4136 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4137 error ("template header not allowed in member definition "
4138 "of explicitly specialized class");
4139 /* Static data member are tricky; an in-class initialization
4140 still doesn't provide a definition, so the in-class
4141 declaration will have DECL_EXTERNAL set, but will have an
4142 initialization. Thus, duplicate_decls won't warn
4143 about this situation, and so we check here. */
4144 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4145 error ("duplicate initialization of %qD", decl);
4146 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4152 tree field = check_classfn (context, decl,
4153 (processing_template_decl
4154 > template_class_depth (context))
4155 ? current_template_parms
4157 if (field && field != error_mark_node
4158 && duplicate_decls (decl, field,
4159 /*newdecl_is_friend=*/false))
4163 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4164 DECL_IN_AGGR_P (decl) = 0;
4165 /* Do not mark DECL as an explicit specialization if it was not
4166 already marked as an instantiation; a declaration should
4167 never be marked as a specialization unless we know what
4168 template is being specialized. */
4169 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4171 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4173 /* [temp.expl.spec] An explicit specialization of a static data
4174 member of a template is a definition if the declaration
4175 includes an initializer; otherwise, it is a declaration.
4177 We check for processing_specialization so this only applies
4178 to the new specialization syntax. */
4179 if (!initialized && processing_specialization)
4180 DECL_EXTERNAL (decl) = 1;
4183 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4184 permerror (input_location, "declaration of %q#D outside of class is not definition",
4188 was_public = TREE_PUBLIC (decl);
4190 /* Enter this declaration into the symbol table. */
4191 decl = maybe_push_decl (decl);
4193 if (processing_template_decl)
4194 decl = push_template_decl (decl);
4195 if (decl == error_mark_node)
4196 return error_mark_node;
4198 /* Tell the back end to use or not use .common as appropriate. If we say
4199 -fconserve-space, we want this to save .data space, at the expense of
4200 wrong semantics. If we say -fno-conserve-space, we want this to
4201 produce errors about redefs; to do this we force variables into the
4203 if (flag_conserve_space
4204 && TREE_CODE (decl) == VAR_DECL
4205 && TREE_PUBLIC (decl)
4206 && !DECL_THREAD_LOCAL_P (decl)
4207 && !have_global_bss_p ())
4208 DECL_COMMON (decl) = 1;
4210 if (TREE_CODE (decl) == VAR_DECL
4211 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4212 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4214 /* This is a const variable with implicit 'static'. Set
4215 DECL_THIS_STATIC so we can tell it from variables that are
4216 !TREE_PUBLIC because of the anonymous namespace. */
4217 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4218 DECL_THIS_STATIC (decl) = 1;
4221 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4222 start_decl_1 (decl, initialized);
4227 /* Process the declaration of a variable DECL. INITIALIZED is true
4228 iff DECL is explicitly initialized. (INITIALIZED is false if the
4229 variable is initialized via an implicitly-called constructor.)
4230 This function must be called for ordinary variables (including, for
4231 example, implicit instantiations of templates), but must not be
4232 called for template declarations. */
4235 start_decl_1 (tree decl, bool initialized)
4239 bool aggregate_definition_p;
4241 gcc_assert (!processing_template_decl);
4243 if (error_operand_p (decl))
4246 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4248 type = TREE_TYPE (decl);
4249 complete_p = COMPLETE_TYPE_P (type);
4250 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4252 /* If an explicit initializer is present, or if this is a definition
4253 of an aggregate, then we need a complete type at this point.
4254 (Scalars are always complete types, so there is nothing to
4255 check.) This code just sets COMPLETE_P; errors (if necessary)
4256 are issued below. */
4257 if ((initialized || aggregate_definition_p)
4259 && COMPLETE_TYPE_P (complete_type (type)))
4262 /* We will not yet have set TREE_READONLY on DECL if the type
4263 was "const", but incomplete, before this point. But, now, we
4264 have a complete type, so we can try again. */
4265 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4269 /* Is it valid for this decl to have an initializer at all? */
4271 /* Don't allow initializations for incomplete types except for
4272 arrays which might be completed by the initialization. */
4274 ; /* A complete type is ok. */
4275 else if (type_uses_auto (type))
4276 ; /* An auto type is ok. */
4277 else if (TREE_CODE (type) != ARRAY_TYPE)
4279 error ("variable %q#D has initializer but incomplete type", decl);
4280 type = TREE_TYPE (decl) = error_mark_node;
4282 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4284 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4285 error ("elements of array %q#D have incomplete type", decl);
4286 /* else we already gave an error in start_decl. */
4289 else if (aggregate_definition_p && !complete_p)
4291 if (type_uses_auto (type))
4292 error ("declaration of %q#D has no initializer", decl);
4294 error ("aggregate %q#D has incomplete type and cannot be defined",
4296 /* Change the type so that assemble_variable will give
4297 DECL an rtl we can live with: (mem (const_int 0)). */
4298 type = TREE_TYPE (decl) = error_mark_node;
4301 /* Create a new scope to hold this declaration if necessary.
4302 Whether or not a new scope is necessary cannot be determined
4303 until after the type has been completed; if the type is a
4304 specialization of a class template it is not until after
4305 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4306 will be set correctly. */
4307 maybe_push_cleanup_level (type);
4310 /* Handle initialization of references. DECL, TYPE, and INIT have the
4311 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4312 but will be set to a new CLEANUP_STMT if a temporary is created
4313 that must be destroyed subsequently.
4315 Returns an initializer expression to use to initialize DECL, or
4316 NULL if the initialization can be performed statically.
4318 Quotes on semantics can be found in ARM 8.4.3. */
4321 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4325 if (init == NULL_TREE)
4327 if ((DECL_LANG_SPECIFIC (decl) == 0
4328 || DECL_IN_AGGR_P (decl) == 0)
4329 && ! DECL_THIS_EXTERN (decl))
4330 error ("%qD declared as reference but not initialized", decl);
4334 if (TREE_CODE (init) == CONSTRUCTOR)
4336 error ("ISO C++ forbids use of initializer list to "
4337 "initialize reference %qD", decl);
4341 if (TREE_CODE (init) == TREE_LIST)
4342 init = build_x_compound_expr_from_list (init, "initializer");
4344 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4345 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4346 /* Note: default conversion is only called in very special cases. */
4347 init = decay_conversion (init);
4349 /* Convert INIT to the reference type TYPE. This may involve the
4350 creation of a temporary, whose lifetime must be the same as that
4351 of the reference. If so, a DECL_EXPR for the temporary will be
4352 added just after the DECL_EXPR for DECL. That's why we don't set
4353 DECL_INITIAL for local references (instead assigning to them
4354 explicitly); we need to allow the temporary to be initialized
4356 tmp = initialize_reference (type, init, decl, cleanup);
4358 if (tmp == error_mark_node)
4360 else if (tmp == NULL_TREE)
4362 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4366 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4369 DECL_INITIAL (decl) = tmp;
4374 /* Subroutine of check_initializer. We're initializing a DECL of
4375 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4376 extend the lifetime of the underlying array to match that of the decl,
4377 just like for reference initialization. CLEANUP is as for
4378 grok_reference_init. */
4381 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4383 tree aggr_init, array, arrtype;
4384 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4385 aggr_init = TARGET_EXPR_INITIAL (init);
4386 init = build2 (INIT_EXPR, type, decl, init);
4388 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4389 arrtype = TREE_TYPE (array);
4391 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4392 array = TREE_OPERAND (array, 0);
4393 /* If the array is constant, finish_compound_literal already made it a
4394 static variable and we don't need to do anything here. */
4395 if (decl && TREE_CODE (array) == TARGET_EXPR)
4398 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4399 var = build_address (var);
4400 var = convert (arrtype, var);
4401 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4402 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4407 /* Designated initializers in arrays are not supported in GNU C++.
4408 The parser cannot detect this error since it does not know whether
4409 a given brace-enclosed initializer is for a class type or for an
4410 array. This function checks that CE does not use a designated
4411 initializer. If it does, an error is issued. Returns true if CE
4412 is valid, i.e., does not have a designated initializer. */
4415 check_array_designated_initializer (const constructor_elt *ce)
4417 /* Designated initializers for array elements are not supported. */
4420 /* The parser only allows identifiers as designated
4422 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4423 error ("name %qD used in a GNU-style designated "
4424 "initializer for an array", ce->index);
4431 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4432 array until we finish parsing the initializer. If that's the
4433 situation we're in, update DECL accordingly. */
4436 maybe_deduce_size_from_array_init (tree decl, tree init)
4438 tree type = TREE_TYPE (decl);
4440 if (TREE_CODE (type) == ARRAY_TYPE
4441 && TYPE_DOMAIN (type) == NULL_TREE
4442 && TREE_CODE (decl) != TYPE_DECL)
4444 /* do_default is really a C-ism to deal with tentative definitions.
4445 But let's leave it here to ease the eventual merge. */
4446 int do_default = !DECL_EXTERNAL (decl);
4447 tree initializer = init ? init : DECL_INITIAL (decl);
4450 /* Check that there are no designated initializers in INIT, as
4451 those are not supported in GNU C++, and as the middle-end
4452 will crash if presented with a non-numeric designated
4454 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4456 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4457 constructor_elt *ce;
4460 VEC_iterate (constructor_elt, v, i, ce);
4462 if (!check_array_designated_initializer (ce))
4468 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4472 error ("initializer fails to determine size of %qD", decl);
4473 TREE_TYPE (decl) = error_mark_node;
4475 else if (failure == 2)
4479 error ("array size missing in %qD", decl);
4480 TREE_TYPE (decl) = error_mark_node;
4482 /* If a `static' var's size isn't known, make it extern as
4483 well as static, so it does not get allocated. If it's not
4484 `static', then don't mark it extern; finish_incomplete_decl
4485 will give it a default size and it will get allocated. */
4486 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4487 DECL_EXTERNAL (decl) = 1;
4489 else if (failure == 3)
4491 error ("zero-size array %qD", decl);
4492 TREE_TYPE (decl) = error_mark_node;
4496 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4498 layout_decl (decl, 0);
4502 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4503 any appropriate error messages regarding the layout. */
4506 layout_var_decl (tree decl)
4510 type = TREE_TYPE (decl);
4511 if (type == error_mark_node)
4514 /* If we haven't already layed out this declaration, do so now.
4515 Note that we must not call complete type for an external object
4516 because it's type might involve templates that we are not
4517 supposed to instantiate yet. (And it's perfectly valid to say
4518 `extern X x' for some incomplete type `X'.) */
4519 if (!DECL_EXTERNAL (decl))
4520 complete_type (type);
4521 if (!DECL_SIZE (decl)
4522 && TREE_TYPE (decl) != error_mark_node
4523 && (COMPLETE_TYPE_P (type)
4524 || (TREE_CODE (type) == ARRAY_TYPE
4525 && !TYPE_DOMAIN (type)
4526 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4527 layout_decl (decl, 0);
4529 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4531 /* An automatic variable with an incomplete type: that is an error.
4532 Don't talk about array types here, since we took care of that
4533 message in grokdeclarator. */
4534 error ("storage size of %qD isn't known", decl);
4535 TREE_TYPE (decl) = error_mark_node;
4538 /* Keep this code around in case we later want to control debug info
4539 based on whether a type is "used". (jason 1999-11-11) */
4541 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4542 /* Let debugger know it should output info for this type. */
4543 note_debug_info_needed (ttype);
4545 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4546 note_debug_info_needed (DECL_CONTEXT (decl));
4549 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4550 && DECL_SIZE (decl) != NULL_TREE
4551 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4553 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4554 constant_expression_warning (DECL_SIZE (decl));
4557 error ("storage size of %qD isn't constant", decl);
4558 TREE_TYPE (decl) = error_mark_node;
4563 /* If a local static variable is declared in an inline function, or if
4564 we have a weak definition, we must endeavor to create only one
4565 instance of the variable at link-time. */
4568 maybe_commonize_var (tree decl)
4570 /* Static data in a function with comdat linkage also has comdat
4572 if (TREE_STATIC (decl)
4573 /* Don't mess with __FUNCTION__. */
4574 && ! DECL_ARTIFICIAL (decl)
4575 && DECL_FUNCTION_SCOPE_P (decl)
4576 /* Unfortunately, import_export_decl has not always been called
4577 before the function is processed, so we cannot simply check
4579 && (DECL_COMDAT (DECL_CONTEXT (decl))
4580 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4581 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4582 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4586 /* With weak symbols, we simply make the variable COMDAT;
4587 that will cause copies in multiple translations units to
4589 comdat_linkage (decl);
4593 if (DECL_INITIAL (decl) == NULL_TREE
4594 || DECL_INITIAL (decl) == error_mark_node)
4596 /* Without weak symbols, we can use COMMON to merge
4597 uninitialized variables. */
4598 TREE_PUBLIC (decl) = 1;
4599 DECL_COMMON (decl) = 1;
4603 /* While for initialized variables, we must use internal
4604 linkage -- which means that multiple copies will not
4606 TREE_PUBLIC (decl) = 0;
4607 DECL_COMMON (decl) = 0;
4608 warning (0, "sorry: semantics of inline function static "
4609 "data %q+#D are wrong (you'll wind up "
4610 "with multiple copies)", decl);
4611 warning (0, "%J you can work around this by removing "
4617 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4618 /* Set it up again; we might have set DECL_INITIAL since the last
4620 comdat_linkage (decl);
4623 /* Issue an error message if DECL is an uninitialized const variable. */
4626 check_for_uninitialized_const_var (tree decl)
4628 tree type = TREE_TYPE (decl);
4630 /* ``Unless explicitly declared extern, a const object does not have
4631 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4633 if (TREE_CODE (decl) == VAR_DECL
4634 && TREE_CODE (type) != REFERENCE_TYPE
4635 && CP_TYPE_CONST_P (type)
4636 && !TYPE_NEEDS_CONSTRUCTING (type)
4637 && !DECL_INITIAL (decl))
4638 error ("uninitialized const %qD", decl);
4642 /* Structure holding the current initializer being processed by reshape_init.
4643 CUR is a pointer to the current element being processed, END is a pointer
4644 after the last element present in the initializer. */
4645 typedef struct reshape_iterator_t
4647 constructor_elt *cur;
4648 constructor_elt *end;
4651 static tree reshape_init_r (tree, reshape_iter *, bool);
4653 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4654 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4655 initialized. If there are no more such fields, the return value
4659 next_initializable_field (tree field)
4662 && (TREE_CODE (field) != FIELD_DECL
4663 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4664 || DECL_ARTIFICIAL (field)))
4665 field = TREE_CHAIN (field);
4670 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4671 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4672 INTEGER_CST representing the size of the array minus one (the maximum index),
4673 or NULL_TREE if the array was declared without specifying the size. D is
4674 the iterator within the constructor. */
4677 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4680 bool sized_array_p = (max_index != NULL_TREE);
4681 unsigned HOST_WIDE_INT max_index_cst = 0;
4682 unsigned HOST_WIDE_INT index;
4684 /* The initializer for an array is always a CONSTRUCTOR. */
4685 new_init = build_constructor (init_list_type_node, NULL);
4689 /* Minus 1 is used for zero sized arrays. */
4690 if (integer_all_onesp (max_index))
4693 if (host_integerp (max_index, 1))
4694 max_index_cst = tree_low_cst (max_index, 1);
4695 /* sizetype is sign extended, not zero extended. */
4697 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4701 /* Loop until there are no more initializers. */
4703 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4708 check_array_designated_initializer (d->cur);
4709 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4710 if (elt_init == error_mark_node)
4711 return error_mark_node;
4712 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4718 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4719 Parameters are the same of reshape_init_r. */
4722 reshape_init_array (tree type, reshape_iter *d)
4724 tree max_index = NULL_TREE;
4726 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4728 if (TYPE_DOMAIN (type))
4729 max_index = array_type_nelts (type);
4731 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4734 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4735 Parameters are the same of reshape_init_r. */
4738 reshape_init_vector (tree type, reshape_iter *d)
4740 tree max_index = NULL_TREE;
4743 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4745 if (COMPOUND_LITERAL_P (d->cur->value))
4747 tree value = d->cur->value;
4748 if (!same_type_p (TREE_TYPE (value), type))
4750 error ("invalid type %qT as initializer for a vector of type %qT",
4751 TREE_TYPE (d->cur->value), type);
4752 value = error_mark_node;
4758 /* For a vector, the representation type is a struct
4759 containing a single member which is an array of the
4760 appropriate size. */
4761 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4762 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4763 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4765 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4768 /* Subroutine of reshape_init_r, processes the initializers for classes
4769 or union. Parameters are the same of reshape_init_r. */
4772 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4777 gcc_assert (CLASS_TYPE_P (type));
4779 /* The initializer for a class is always a CONSTRUCTOR. */
4780 new_init = build_constructor (init_list_type_node, NULL);
4781 field = next_initializable_field (TYPE_FIELDS (type));
4787 An initializer for an aggregate member that is an
4788 empty class shall have the form of an empty
4789 initializer-list {}. */
4790 if (!first_initializer_p)
4792 error ("initializer for %qT must be brace-enclosed", type);
4793 return error_mark_node;
4798 /* Loop through the initializable fields, gathering initializers. */
4799 while (d->cur != d->end)
4803 /* Handle designated initializers, as an extension. */
4806 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4808 if (!field || TREE_CODE (field) != FIELD_DECL)
4810 error ("%qT has no non-static data member named %qD", type,
4812 return error_mark_node;
4816 /* If we processed all the member of the class, we are done. */
4820 field_init = reshape_init_r (TREE_TYPE (field), d,
4821 /*first_initializer_p=*/false);
4822 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4826 When a union is initialized with a brace-enclosed
4827 initializer, the braces shall only contain an
4828 initializer for the first member of the union. */
4829 if (TREE_CODE (type) == UNION_TYPE)
4832 field = next_initializable_field (TREE_CHAIN (field));
4838 /* Subroutine of reshape_init, which processes a single initializer (part of
4839 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4840 iterator within the CONSTRUCTOR which points to the initializer to process.
4841 FIRST_INITIALIZER_P is true if this is the first initializer of the
4842 CONSTRUCTOR node. */
4845 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4847 tree init = d->cur->value;
4849 if (error_operand_p (init))
4850 return error_mark_node;
4852 /* A non-aggregate type is always initialized with a single
4854 if (!CP_AGGREGATE_TYPE_P (type))
4856 /* It is invalid to initialize a non-aggregate type with a
4857 brace-enclosed initializer before C++0x.
4858 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4859 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4860 a CONSTRUCTOR (with a record type). */
4861 if (TREE_CODE (init) == CONSTRUCTOR
4862 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4864 if (SCALAR_TYPE_P (type))
4866 error ("braces around scalar initializer for type %qT", type);
4867 init = error_mark_node;
4870 maybe_warn_cpp0x ("extended initializer lists");
4879 All implicit type conversions (clause _conv_) are considered when
4880 initializing the aggregate member with an initializer from an
4881 initializer-list. If the initializer can initialize a member,
4882 the member is initialized. Otherwise, if the member is itself a
4883 non-empty subaggregate, brace elision is assumed and the
4884 initializer is considered for the initialization of the first
4885 member of the subaggregate. */
4886 if (TREE_CODE (init) != CONSTRUCTOR
4887 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4893 /* [dcl.init.string]
4895 A char array (whether plain char, signed char, or unsigned char)
4896 can be initialized by a string-literal (optionally enclosed in
4897 braces); a wchar_t array can be initialized by a wide
4898 string-literal (optionally enclosed in braces). */
4899 if (TREE_CODE (type) == ARRAY_TYPE
4900 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4902 tree str_init = init;
4904 /* Strip one level of braces if and only if they enclose a single
4905 element (as allowed by [dcl.init.string]). */
4906 if (!first_initializer_p
4907 && TREE_CODE (str_init) == CONSTRUCTOR
4908 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4910 str_init = VEC_index (constructor_elt,
4911 CONSTRUCTOR_ELTS (str_init), 0)->value;
4914 /* If it's a string literal, then it's the initializer for the array
4915 as a whole. Otherwise, continue with normal initialization for
4916 array types (one value per array element). */
4917 if (TREE_CODE (str_init) == STRING_CST)
4924 /* The following cases are about aggregates. If we are not within a full
4925 initializer already, and there is not a CONSTRUCTOR, it means that there
4926 is a missing set of braces (that is, we are processing the case for
4927 which reshape_init exists). */
4928 if (!first_initializer_p)
4930 if (TREE_CODE (init) == CONSTRUCTOR)
4932 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4933 /* There is no need to reshape pointer-to-member function
4934 initializers, as they are always constructed correctly
4935 by the front end. */
4937 else if (COMPOUND_LITERAL_P (init))
4938 /* For a nested compound literal, there is no need to reshape since
4939 brace elision is not allowed. Even if we decided to allow it,
4940 we should add a call to reshape_init in finish_compound_literal,
4941 before calling digest_init, so changing this code would still
4942 not be necessary. */
4943 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4947 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4948 return reshape_init (type, init);
4952 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4956 /* Dispatch to specialized routines. */
4957 if (CLASS_TYPE_P (type))
4958 return reshape_init_class (type, d, first_initializer_p);
4959 else if (TREE_CODE (type) == ARRAY_TYPE)
4960 return reshape_init_array (type, d);
4961 else if (TREE_CODE (type) == VECTOR_TYPE)
4962 return reshape_init_vector (type, d);
4967 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4968 brace-enclosed aggregate initializer.
4970 INIT is the CONSTRUCTOR containing the list of initializers describing
4971 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4972 It may not presently match the shape of the TYPE; for example:
4974 struct S { int a; int b; };
4975 struct S a[] = { 1, 2, 3, 4 };
4977 Here INIT will hold a VEC of four elements, rather than a
4978 VEC of two elements, each itself a VEC of two elements. This
4979 routine transforms INIT from the former form into the latter. The
4980 revised CONSTRUCTOR node is returned. */
4983 reshape_init (tree type, tree init)
4985 VEC(constructor_elt, gc) *v;
4989 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4991 v = CONSTRUCTOR_ELTS (init);
4993 /* An empty constructor does not need reshaping, and it is always a valid
4995 if (VEC_empty (constructor_elt, v))
4998 /* Recurse on this CONSTRUCTOR. */
4999 d.cur = VEC_index (constructor_elt, v, 0);
5000 d.end = d.cur + VEC_length (constructor_elt, v);
5002 new_init = reshape_init_r (type, &d, true);
5003 if (new_init == error_mark_node)
5004 return error_mark_node;
5006 /* Make sure all the element of the constructor were used. Otherwise,
5007 issue an error about exceeding initializers. */
5009 error ("too many initializers for %qT", type);
5014 /* Verify array initializer. Returns true if errors have been reported. */
5017 check_array_initializer (tree decl, tree type, tree init)
5019 tree element_type = TREE_TYPE (type);
5021 /* The array type itself need not be complete, because the
5022 initializer may tell us how many elements are in the array.
5023 But, the elements of the array must be complete. */
5024 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5027 error ("elements of array %q#D have incomplete type", decl);
5029 error ("elements of array %q#T have incomplete type", type);
5032 /* It is not valid to initialize a VLA. */
5034 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5035 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5038 error ("variable-sized object %qD may not be initialized", decl);
5040 error ("variable-sized compound literal");
5046 /* Subroutine of check_initializer; args are passed down from that function.
5047 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5050 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5053 int saved_stmts_are_full_exprs_p = 0;
5054 if (building_stmt_tree ())
5056 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5057 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5059 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5060 if (building_stmt_tree ())
5061 current_stmt_tree ()->stmts_are_full_exprs_p =
5062 saved_stmts_are_full_exprs_p;
5066 /* Verify INIT (the initializer for DECL), and record the
5067 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5068 grok_reference_init.
5070 If the return value is non-NULL, it is an expression that must be
5071 evaluated dynamically to initialize DECL. */
5074 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5076 tree type = TREE_TYPE (decl);
5077 tree init_code = NULL;
5079 /* Things that are going to be initialized need to have complete
5081 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5083 if (type == error_mark_node)
5084 /* We will have already complained. */
5087 if (TREE_CODE (type) == ARRAY_TYPE)
5089 if (check_array_initializer (decl, type, init))
5092 else if (!COMPLETE_TYPE_P (type))
5094 error ("%qD has incomplete type", decl);
5095 TREE_TYPE (decl) = error_mark_node;
5099 /* There is no way to make a variable-sized class type in GNU C++. */
5100 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5102 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5104 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5105 if (SCALAR_TYPE_P (type))
5109 maybe_warn_cpp0x ("extended initializer lists");
5110 init = build_zero_init (type, NULL_TREE, false);
5112 else if (init_len != 1)
5114 error ("scalar object %qD requires one element in initializer",
5116 TREE_TYPE (decl) = error_mark_node;
5122 if (TREE_CODE (decl) == CONST_DECL)
5124 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5126 DECL_INITIAL (decl) = init;
5128 gcc_assert (init != NULL_TREE);
5131 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5132 init = grok_reference_init (decl, type, init, cleanup);
5135 /* Do not reshape constructors of vectors (they don't need to be
5137 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5139 if (is_std_init_list (type))
5140 return build_init_list_var_init (decl, type, init, cleanup);
5141 else if (TYPE_NON_AGGREGATE_CLASS (type))
5143 /* Don't reshape if the class has constructors. */
5144 if (cxx_dialect == cxx98)
5145 error ("in C++98 %qD must be initialized by constructor, "
5148 init = build_tree_list (NULL_TREE, init);
5150 else if ((*targetm.vector_opaque_p) (type))
5152 error ("opaque vector types cannot be initialized");
5153 init = error_mark_node;
5156 init = reshape_init (type, init);
5159 /* If DECL has an array type without a specific bound, deduce the
5160 array size from the initializer. */
5161 maybe_deduce_size_from_array_init (decl, init);
5162 type = TREE_TYPE (decl);
5163 if (type == error_mark_node)
5166 if (TYPE_NEEDS_CONSTRUCTING (type)
5167 || (CLASS_TYPE_P (type)
5168 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5169 return build_aggr_init_full_exprs (decl, init, flags);
5170 else if (TREE_CODE (init) != TREE_VEC)
5172 init_code = store_init_value (decl, init);
5173 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5174 && DECL_INITIAL (decl)
5175 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5176 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5177 warning (0, "array %qD initialized by parenthesized string literal %qE",
5178 decl, DECL_INITIAL (decl));
5182 else if (DECL_EXTERNAL (decl))
5184 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5185 return build_aggr_init_full_exprs (decl, init, flags);
5186 else if (MAYBE_CLASS_TYPE_P (type))
5188 tree core_type = strip_array_types (type);
5190 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5191 error ("structure %qD with uninitialized const members", decl);
5192 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5193 error ("structure %qD with uninitialized reference members", decl);
5195 check_for_uninitialized_const_var (decl);
5198 check_for_uninitialized_const_var (decl);
5200 if (init && init != error_mark_node)
5201 init_code = build2 (INIT_EXPR, type, decl, init);
5206 /* If DECL is not a local variable, give it RTL. */
5209 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5211 int toplev = toplevel_bindings_p ();
5213 const char *filename;
5215 /* Set the DECL_ASSEMBLER_NAME for the object. */
5218 /* The `register' keyword, when used together with an
5219 asm-specification, indicates that the variable should be
5220 placed in a particular register. */
5221 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5223 set_user_assembler_name (decl, asmspec);
5224 DECL_HARD_REGISTER (decl) = 1;
5228 if (TREE_CODE (decl) == FUNCTION_DECL
5229 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5230 set_builtin_user_assembler_name (decl, asmspec);
5231 set_user_assembler_name (decl, asmspec);
5235 /* Handle non-variables up front. */
5236 if (TREE_CODE (decl) != VAR_DECL)
5238 rest_of_decl_compilation (decl, toplev, at_eof);
5242 /* If we see a class member here, it should be a static data
5244 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5246 gcc_assert (TREE_STATIC (decl));
5247 /* An in-class declaration of a static data member should be
5248 external; it is only a declaration, and not a definition. */
5249 if (init == NULL_TREE)
5250 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5253 /* We don't create any RTL for local variables. */
5254 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5257 /* We defer emission of local statics until the corresponding
5258 DECL_EXPR is expanded. */
5259 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5261 /* We try to defer namespace-scope static constants so that they are
5262 not emitted into the object file unnecessarily. */
5263 filename = input_filename;
5264 if (!DECL_VIRTUAL_P (decl)
5265 && TREE_READONLY (decl)
5266 && DECL_INITIAL (decl) != NULL_TREE
5267 && DECL_INITIAL (decl) != error_mark_node
5269 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5271 && !TREE_PUBLIC (decl))
5273 /* Fool with the linkage of static consts according to #pragma
5275 struct c_fileinfo *finfo = get_fileinfo (filename);
5276 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5278 TREE_PUBLIC (decl) = 1;
5279 DECL_EXTERNAL (decl) = finfo->interface_only;
5284 /* Likewise for template instantiations. */
5285 else if (DECL_LANG_SPECIFIC (decl)
5286 && DECL_IMPLICIT_INSTANTIATION (decl))
5289 /* If we're not deferring, go ahead and assemble the variable. */
5291 rest_of_decl_compilation (decl, toplev, at_eof);
5294 /* walk_tree helper for wrap_temporary_cleanups, below. */
5297 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5299 if (TYPE_P (*stmt_p))
5305 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5307 tree guard = (tree)data;
5308 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5310 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5311 /* Tell honor_protect_cleanup_actions to handle this as a separate
5313 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5315 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5321 /* We're initializing a local variable which has a cleanup GUARD. If there
5322 are any temporaries used in the initializer INIT of this variable, we
5323 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5324 variable will be cleaned up properly if one of them throws.
5326 Unfortunately, there's no way to express this properly in terms of
5327 nesting, as the regions for the temporaries overlap the region for the
5328 variable itself; if there are two temporaries, the variable needs to be
5329 the first thing destroyed if either of them throws. However, we only
5330 want to run the variable's cleanup if it actually got constructed. So
5331 we need to guard the temporary cleanups with the variable's cleanup if
5332 they are run on the normal path, but not if they are run on the
5333 exceptional path. We implement this by telling
5334 honor_protect_cleanup_actions to strip the variable cleanup from the
5335 exceptional path. */
5338 wrap_temporary_cleanups (tree init, tree guard)
5340 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5343 /* Generate code to initialize DECL (a local variable). */
5346 initialize_local_var (tree decl, tree init)
5348 tree type = TREE_TYPE (decl);
5352 gcc_assert (TREE_CODE (decl) == VAR_DECL
5353 || TREE_CODE (decl) == RESULT_DECL);
5354 gcc_assert (!TREE_STATIC (decl));
5356 if (DECL_SIZE (decl) == NULL_TREE)
5358 /* If we used it already as memory, it must stay in memory. */
5359 DECL_INITIAL (decl) = NULL_TREE;
5360 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5364 if (type == error_mark_node)
5367 /* Compute and store the initial value. */
5368 already_used = TREE_USED (decl) || TREE_USED (type);
5370 /* Generate a cleanup, if necessary. */
5371 cleanup = cxx_maybe_build_cleanup (decl);
5373 /* Perform the initialization. */
5376 int saved_stmts_are_full_exprs_p;
5378 /* If we're only initializing a single object, guard the destructors
5379 of any temporaries used in its initializer with its destructor.
5380 This isn't right for arrays because each element initialization is
5381 a full-expression. */
5382 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5383 wrap_temporary_cleanups (init, cleanup);
5385 gcc_assert (building_stmt_tree ());
5386 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5387 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5388 finish_expr_stmt (init);
5389 current_stmt_tree ()->stmts_are_full_exprs_p =
5390 saved_stmts_are_full_exprs_p;
5393 /* Set this to 0 so we can tell whether an aggregate which was
5394 initialized was ever used. Don't do this if it has a
5395 destructor, so we don't complain about the 'resource
5396 allocation is initialization' idiom. Now set
5397 attribute((unused)) on types so decls of that type will be
5398 marked used. (see TREE_USED, above.) */
5399 if (TYPE_NEEDS_CONSTRUCTING (type)
5401 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5402 && DECL_NAME (decl))
5403 TREE_USED (decl) = 0;
5404 else if (already_used)
5405 TREE_USED (decl) = 1;
5408 finish_decl_cleanup (decl, cleanup);
5411 /* DECL is a VAR_DECL for a compiler-generated variable with static
5412 storage duration (like a virtual table) whose initializer is a
5413 compile-time constant. INIT must be either a TREE_LIST of values,
5414 or a CONSTRUCTOR. Initialize the variable and provide it to the
5418 initialize_artificial_var (tree decl, tree init)
5420 gcc_assert (DECL_ARTIFICIAL (decl));
5421 if (TREE_CODE (init) == TREE_LIST)
5422 init = build_constructor_from_list (TREE_TYPE (decl), init);
5423 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5424 DECL_INITIAL (decl) = init;
5425 DECL_INITIALIZED_P (decl) = 1;
5426 determine_visibility (decl);
5427 layout_var_decl (decl);
5428 maybe_commonize_var (decl);
5429 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5432 /* INIT is the initializer for a variable, as represented by the
5433 parser. Returns true iff INIT is value-dependent. */
5436 value_dependent_init_p (tree init)
5438 if (TREE_CODE (init) == TREE_LIST)
5439 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5440 return any_value_dependent_elements_p (init);
5441 else if (TREE_CODE (init) == CONSTRUCTOR)
5442 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5444 VEC(constructor_elt, gc) *elts;
5448 elts = CONSTRUCTOR_ELTS (init);
5449 nelts = VEC_length (constructor_elt, elts);
5450 for (i = 0; i < nelts; ++i)
5451 if (value_dependent_init_p (VEC_index (constructor_elt,
5456 /* It must be a simple expression, e.g., int i = 3; */
5457 return value_dependent_expression_p (init);
5462 /* Finish processing of a declaration;
5463 install its line number and initial value.
5464 If the length of an array type is not known before,
5465 it must be determined now, from the initial value, or it is an error.
5467 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5468 true, then INIT is an integral constant expression.
5470 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5471 if the (init) syntax was used. */
5474 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5475 tree asmspec_tree, int flags)
5479 const char *asmspec = NULL;
5480 int was_readonly = 0;
5481 bool var_definition_p = false;
5482 int saved_processing_template_decl;
5485 if (decl == error_mark_node)
5490 error ("assignment (not initialization) in declaration");
5494 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5495 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5496 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5498 type = TREE_TYPE (decl);
5499 if (type == error_mark_node)
5502 /* Assume no cleanup is required. */
5503 cleanup = NULL_TREE;
5504 saved_processing_template_decl = processing_template_decl;
5506 /* If a name was specified, get the string. */
5507 if (global_scope_p (current_binding_level))
5508 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5509 if (asmspec_tree && asmspec_tree != error_mark_node)
5510 asmspec = TREE_STRING_POINTER (asmspec_tree);
5512 if (current_class_type
5513 && CP_DECL_CONTEXT (decl) == current_class_type
5514 && TYPE_BEING_DEFINED (current_class_type)
5515 && (DECL_INITIAL (decl) || init))
5516 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5518 auto_node = type_uses_auto (type);
5521 if (init == NULL_TREE)
5523 error ("declaration of %q#D has no initializer", decl);
5524 TREE_TYPE (decl) = error_mark_node;
5527 else if (describable_type (init))
5529 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5530 if (type == error_mark_node)
5535 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5537 if (init == ridpointers[(int)RID_DELETE])
5539 /* FIXME check this is 1st decl. */
5540 DECL_DELETED_FN (decl) = 1;
5541 DECL_DECLARED_INLINE_P (decl) = 1;
5542 DECL_INITIAL (decl) = error_mark_node;
5545 else if (init == ridpointers[(int)RID_DEFAULT])
5547 if (!defaultable_fn_p (decl))
5549 error ("%qD cannot be defaulted", decl);
5550 DECL_INITIAL (decl) = NULL_TREE;
5553 DECL_DEFAULTED_FN (decl) = 1;
5557 if (processing_template_decl)
5559 bool type_dependent_p;
5561 /* Add this declaration to the statement-tree. */
5562 if (at_function_scope_p ())
5563 add_decl_expr (decl);
5565 type_dependent_p = dependent_type_p (type);
5567 if (check_for_bare_parameter_packs (init))
5570 DECL_INITIAL (decl) = NULL_TREE;
5573 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5575 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5576 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5577 TREE_CONSTANT (decl) = 1;
5580 /* Generally, initializers in templates are expanded when the
5581 template is instantiated. But, if DECL is an integral
5582 constant static data member, then it can be used in future
5583 integral constant expressions, and its value must be
5586 && DECL_CLASS_SCOPE_P (decl)
5587 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5588 && !type_dependent_p
5589 && !value_dependent_init_p (init)))
5592 DECL_INITIAL (decl) = init;
5593 if (TREE_CODE (decl) == VAR_DECL
5594 && !DECL_PRETTY_FUNCTION_P (decl)
5595 && !type_dependent_p)
5596 maybe_deduce_size_from_array_init (decl, init);
5600 if (TREE_CODE (init) == TREE_LIST)
5602 /* If the parenthesized-initializer form was used (e.g.,
5603 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5604 arguments. (There is generally only one.) We convert them
5607 for (; list; list = TREE_CHAIN (list))
5609 tree elt = TREE_VALUE (list);
5610 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5614 init = fold_non_dependent_expr (init);
5615 processing_template_decl = 0;
5618 /* Take care of TYPE_DECLs up front. */
5619 if (TREE_CODE (decl) == TYPE_DECL)
5621 if (type != error_mark_node
5622 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5624 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5625 warning (0, "shadowing previous type declaration of %q#D", decl);
5626 set_identifier_type_value (DECL_NAME (decl), decl);
5629 /* If we have installed this as the canonical typedef for this
5630 type, and that type has not been defined yet, delay emitting
5631 the debug information for it, as we will emit it later. */
5632 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5633 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5634 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5636 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5641 /* A reference will be modified here, as it is initialized. */
5642 if (! DECL_EXTERNAL (decl)
5643 && TREE_READONLY (decl)
5644 && TREE_CODE (type) == REFERENCE_TYPE)
5647 TREE_READONLY (decl) = 0;
5650 if (TREE_CODE (decl) == VAR_DECL)
5652 /* Only PODs can have thread-local storage. Other types may require
5653 various kinds of non-trivial initialization. */
5654 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5655 error ("%qD cannot be thread-local because it has non-POD type %qT",
5656 decl, TREE_TYPE (decl));
5657 /* If this is a local variable that will need a mangled name,
5658 register it now. We must do this before processing the
5659 initializer for the variable, since the initialization might
5660 require a guard variable, and since the mangled name of the
5661 guard variable will depend on the mangled name of this
5663 if (DECL_FUNCTION_SCOPE_P (decl)
5664 && TREE_STATIC (decl)
5665 && !DECL_ARTIFICIAL (decl))
5666 push_local_name (decl);
5667 /* Convert the initializer to the type of DECL, if we have not
5668 already initialized DECL. */
5669 if (!DECL_INITIALIZED_P (decl)
5670 /* If !DECL_EXTERNAL then DECL is being defined. In the
5671 case of a static data member initialized inside the
5672 class-specifier, there can be an initializer even if DECL
5673 is *not* defined. */
5674 && (!DECL_EXTERNAL (decl) || init))
5676 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5679 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5680 /* Allow libjava/prims.cc define primitive classes. */
5681 if (init != NULL_TREE
5682 || jclass == NULL_TREE
5683 || TREE_CODE (jclass) != TYPE_DECL
5684 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5685 || !same_type_ignoring_top_level_qualifiers_p
5686 (type, TREE_TYPE (TREE_TYPE (jclass))))
5687 error ("Java object %qD not allocated with %<new%>", decl);
5692 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5693 if (init_const_expr_p)
5695 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5696 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5697 TREE_CONSTANT (decl) = 1;
5700 init = check_initializer (decl, init, flags, &cleanup);
5701 /* Thread-local storage cannot be dynamically initialized. */
5702 if (DECL_THREAD_LOCAL_P (decl) && init)
5704 error ("%qD is thread-local and so cannot be dynamically "
5705 "initialized", decl);
5709 /* Check that the initializer for a static data member was a
5710 constant. Although we check in the parser that the
5711 initializer is an integral constant expression, we do not
5712 simplify division-by-zero at the point at which it
5713 occurs. Therefore, in:
5715 struct S { static const int i = 7 / 0; };
5717 we issue an error at this point. It would
5718 probably be better to forbid division by zero in
5719 integral constant expressions. */
5720 if (DECL_EXTERNAL (decl) && init)
5722 error ("%qD cannot be initialized by a non-constant expression"
5723 " when being declared", decl);
5724 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5732 The memory occupied by any object of static storage
5733 duration is zero-initialized at program startup before
5734 any other initialization takes place.
5736 We cannot create an appropriate initializer until after
5737 the type of DECL is finalized. If DECL_INITIAL is set,
5738 then the DECL is statically initialized, and any
5739 necessary zero-initialization has already been performed. */
5740 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5741 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5742 /*nelts=*/NULL_TREE,
5743 /*static_storage_p=*/true);
5744 /* Remember that the initialization for this variable has
5746 DECL_INITIALIZED_P (decl) = 1;
5747 /* This declaration is the definition of this variable,
5748 unless we are initializing a static data member within
5749 the class specifier. */
5750 if (!DECL_EXTERNAL (decl))
5751 var_definition_p = true;
5753 /* If the variable has an array type, lay out the type, even if
5754 there is no initializer. It is valid to index through the
5755 array, and we must get TYPE_ALIGN set correctly on the array
5757 else if (TREE_CODE (type) == ARRAY_TYPE)
5760 else if (TREE_CODE (decl) == FIELD_DECL
5761 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5762 error ("non-static data member %qD has Java class type", decl);
5764 /* Add this declaration to the statement-tree. This needs to happen
5765 after the call to check_initializer so that the DECL_EXPR for a
5766 reference temp is added before the DECL_EXPR for the reference itself. */
5767 if (at_function_scope_p ())
5768 add_decl_expr (decl);
5770 /* Let the middle end know about variables and functions -- but not
5771 static data members in uninstantiated class templates. */
5772 if (!saved_processing_template_decl
5773 && (TREE_CODE (decl) == VAR_DECL
5774 || TREE_CODE (decl) == FUNCTION_DECL))
5776 if (TREE_CODE (decl) == VAR_DECL)
5778 layout_var_decl (decl);
5779 maybe_commonize_var (decl);
5782 /* This needs to happen after the linkage is set. */
5783 determine_visibility (decl);
5785 if (var_definition_p && TREE_STATIC (decl))
5787 /* If a TREE_READONLY variable needs initialization
5788 at runtime, it is no longer readonly and we need to
5789 avoid MEM_READONLY_P being set on RTL created for it. */
5792 if (TREE_READONLY (decl))
5793 TREE_READONLY (decl) = 0;
5796 else if (was_readonly)
5797 TREE_READONLY (decl) = 1;
5800 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5802 /* Check for abstractness of the type. Notice that there is no
5803 need to strip array types here since the check for those types
5804 is already done within create_array_type_for_decl. */
5805 if (TREE_CODE (type) == FUNCTION_TYPE
5806 || TREE_CODE (type) == METHOD_TYPE)
5807 abstract_virtuals_error (decl, TREE_TYPE (type));
5809 abstract_virtuals_error (decl, type);
5811 if (TREE_TYPE (decl) == error_mark_node)
5812 /* No initialization required. */
5814 else if (TREE_CODE (decl) == FUNCTION_DECL)
5818 if (init == ridpointers[(int)RID_DEFAULT])
5820 /* An out-of-class default definition is defined at
5821 the point where it is explicitly defaulted. */
5822 if (DECL_INITIAL (decl) == error_mark_node)
5823 synthesize_method (decl);
5826 error ("function %q#D is initialized like a variable", decl);
5828 /* else no initialization required. */
5830 else if (DECL_EXTERNAL (decl)
5831 && ! (DECL_LANG_SPECIFIC (decl)
5832 && DECL_NOT_REALLY_EXTERN (decl)))
5835 DECL_INITIAL (decl) = init;
5837 /* A variable definition. */
5838 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5839 /* Initialize the local variable. */
5840 initialize_local_var (decl, init);
5842 /* If a variable is defined, and then a subsequent
5843 definition with external linkage is encountered, we will
5844 get here twice for the same variable. We want to avoid
5845 calling expand_static_init more than once. For variables
5846 that are not static data members, we can call
5847 expand_static_init only when we actually process the
5848 initializer. It is not legal to redeclare a static data
5849 member, so this issue does not arise in that case. */
5850 else if (var_definition_p && TREE_STATIC (decl))
5851 expand_static_init (decl, init);
5854 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5855 reference, insert it in the statement-tree now. */
5857 push_cleanup (decl, cleanup, false);
5860 processing_template_decl = saved_processing_template_decl;
5863 TREE_READONLY (decl) = 1;
5865 /* If this was marked 'used', be sure it will be output. */
5866 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5867 mark_decl_referenced (decl);
5870 /* This is here for a midend callback from c-common.c. */
5873 finish_decl (tree decl, tree init, tree asmspec_tree)
5875 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5878 /* Returns a declaration for a VAR_DECL as if:
5880 extern "C" TYPE NAME;
5882 had been seen. Used to create compiler-generated global
5886 declare_global_var (tree name, tree type)
5890 push_to_top_level ();
5891 decl = build_decl (VAR_DECL, name, type);
5892 TREE_PUBLIC (decl) = 1;
5893 DECL_EXTERNAL (decl) = 1;
5894 DECL_ARTIFICIAL (decl) = 1;
5895 /* If the user has explicitly declared this variable (perhaps
5896 because the code we are compiling is part of a low-level runtime
5897 library), then it is possible that our declaration will be merged
5898 with theirs by pushdecl. */
5899 decl = pushdecl (decl);
5900 finish_decl (decl, NULL_TREE, NULL_TREE);
5901 pop_from_top_level ();
5906 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5907 if "__cxa_atexit" is not being used) corresponding to the function
5908 to be called when the program exits. */
5911 get_atexit_fn_ptr_type (void)
5916 if (!atexit_fn_ptr_type_node)
5918 if (flag_use_cxa_atexit
5919 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5920 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5921 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5923 /* The parameter to "atexit" is "void (*)(void)". */
5924 arg_types = void_list_node;
5926 fn_type = build_function_type (void_type_node, arg_types);
5927 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5930 return atexit_fn_ptr_type_node;
5933 /* Returns a pointer to the `atexit' function. Note that if
5934 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5935 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5938 get_atexit_node (void)
5945 bool use_aeabi_atexit;
5950 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5952 /* The declaration for `__cxa_atexit' is:
5954 int __cxa_atexit (void (*)(void *), void *, void *)
5956 We build up the argument types and then then function type
5959 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5960 /* First, build the pointer-to-function type for the first
5962 fn_ptr_type = get_atexit_fn_ptr_type ();
5963 /* Then, build the rest of the argument types. */
5964 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5965 if (use_aeabi_atexit)
5967 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5968 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5972 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5973 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5975 /* And the final __cxa_atexit type. */
5976 fn_type = build_function_type (integer_type_node, arg_types);
5977 fn_ptr_type = build_pointer_type (fn_type);
5978 if (use_aeabi_atexit)
5979 name = "__aeabi_atexit";
5981 name = "__cxa_atexit";
5985 /* The declaration for `atexit' is:
5987 int atexit (void (*)());
5989 We build up the argument types and then then function type
5991 fn_ptr_type = get_atexit_fn_ptr_type ();
5992 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5993 /* Build the final atexit type. */
5994 fn_type = build_function_type (integer_type_node, arg_types);
5998 /* Now, build the function declaration. */
5999 push_lang_context (lang_name_c);
6000 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6001 mark_used (atexit_fndecl);
6002 pop_lang_context ();
6003 atexit_node = decay_conversion (atexit_fndecl);
6008 /* Returns the __dso_handle VAR_DECL. */
6011 get_dso_handle_node (void)
6013 if (dso_handle_node)
6014 return dso_handle_node;
6016 /* Declare the variable. */
6017 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6020 return dso_handle_node;
6023 /* Begin a new function with internal linkage whose job will be simply
6024 to destroy some particular variable. */
6026 static GTY(()) int start_cleanup_cnt;
6029 start_cleanup_fn (void)
6034 bool use_cxa_atexit = flag_use_cxa_atexit
6035 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6037 push_to_top_level ();
6039 /* No need to mangle this. */
6040 push_lang_context (lang_name_c);
6042 /* Build the name of the function. */
6043 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6044 /* Build the function declaration. */
6045 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6046 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6047 /* It's a function with internal linkage, generated by the
6049 TREE_PUBLIC (fndecl) = 0;
6050 DECL_ARTIFICIAL (fndecl) = 1;
6051 /* Make the function `inline' so that it is only emitted if it is
6052 actually needed. It is unlikely that it will be inlined, since
6053 it is only called via a function pointer, but we avoid unnecessary
6054 emissions this way. */
6055 DECL_DECLARED_INLINE_P (fndecl) = 1;
6056 DECL_INTERFACE_KNOWN (fndecl) = 1;
6057 /* Build the parameter. */
6062 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6063 DECL_CONTEXT (parmdecl) = fndecl;
6064 TREE_USED (parmdecl) = 1;
6065 DECL_ARGUMENTS (fndecl) = parmdecl;
6069 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6071 pop_lang_context ();
6073 return current_function_decl;
6076 /* Finish the cleanup function begun by start_cleanup_fn. */
6079 end_cleanup_fn (void)
6081 expand_or_defer_fn (finish_function (0));
6083 pop_from_top_level ();
6086 /* Generate code to handle the destruction of DECL, an object with
6087 static storage duration. */
6090 register_dtor_fn (tree decl)
6099 type = TREE_TYPE (decl);
6100 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6101 return void_zero_node;
6103 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6104 a class object, we can just pass the destructor to
6105 "__cxa_atexit"; we don't have to build a temporary function to do
6107 use_dtor = (flag_use_cxa_atexit
6108 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6109 && CLASS_TYPE_P (type));
6114 /* Find the destructor. */
6115 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6116 gcc_assert (idx >= 0);
6117 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6118 /* Make sure it is accessible. */
6119 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6123 /* Call build_cleanup before we enter the anonymous function so
6124 that any access checks will be done relative to the current
6125 scope, rather than the scope of the anonymous function. */
6126 build_cleanup (decl);
6128 /* Now start the function. */
6129 cleanup = start_cleanup_fn ();
6131 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6132 to the original function, rather than the anonymous one. That
6133 will make the back end think that nested functions are in use,
6134 which causes confusion. */
6135 push_deferring_access_checks (dk_no_check);
6136 fcall = build_cleanup (decl);
6137 pop_deferring_access_checks ();
6139 /* Create the body of the anonymous function. */
6140 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6141 finish_expr_stmt (fcall);
6142 finish_compound_stmt (compound_stmt);
6146 /* Call atexit with the cleanup function. */
6147 mark_used (cleanup);
6148 cleanup = build_address (cleanup);
6149 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6155 /* We must convert CLEANUP to the type that "__cxa_atexit"
6157 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6158 /* "__cxa_atexit" will pass the address of DECL to the
6159 cleanup function. */
6161 addr = build_address (decl);
6162 /* The declared type of the parameter to "__cxa_atexit" is
6163 "void *". For plain "T*", we could just let the
6164 machinery in cp_build_function_call convert it -- but if the
6165 type is "cv-qualified T *", then we need to convert it
6166 before passing it in, to avoid spurious errors. */
6167 addr = build_nop (ptr_type_node, addr);
6170 /* Since the cleanup functions we build ignore the address
6171 they're given, there's no reason to pass the actual address
6172 in, and, in general, it's cheaper to pass NULL than any
6174 addr = null_pointer_node;
6175 args = tree_cons (NULL_TREE,
6176 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6177 tf_warning_or_error),
6179 if (targetm.cxx.use_aeabi_atexit ())
6181 args = tree_cons (NULL_TREE, cleanup, args);
6182 args = tree_cons (NULL_TREE, addr, args);
6186 args = tree_cons (NULL_TREE, addr, args);
6187 args = tree_cons (NULL_TREE, cleanup, args);
6191 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6192 return cp_build_function_call (get_atexit_node (), args,
6193 tf_warning_or_error);
6196 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6197 is its initializer. Generate code to handle the construction
6198 and destruction of DECL. */
6201 expand_static_init (tree decl, tree init)
6203 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6204 gcc_assert (TREE_STATIC (decl));
6206 /* Some variables require no initialization. */
6208 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6209 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6212 if (DECL_FUNCTION_SCOPE_P (decl))
6214 /* Emit code to perform this initialization but once. */
6215 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6216 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6217 tree guard, guard_addr;
6218 tree acquire_fn, release_fn, abort_fn;
6221 /* Emit code to perform this initialization but once. This code
6224 static <type> guard;
6225 if (!guard.first_byte) {
6226 if (__cxa_guard_acquire (&guard)) {
6229 // Do initialization.
6230 flag = true; __cxa_guard_release (&guard);
6231 // Register variable for destruction at end of program.
6233 if (!flag) __cxa_guard_abort (&guard);
6237 Note that the `flag' variable is only set to 1 *after* the
6238 initialization is complete. This ensures that an exception,
6239 thrown during the construction, will cause the variable to
6240 reinitialized when we pass through this code again, as per:
6244 If the initialization exits by throwing an exception, the
6245 initialization is not complete, so it will be tried again
6246 the next time control enters the declaration.
6248 This process should be thread-safe, too; multiple threads
6249 should not be able to initialize the variable more than
6252 /* Create the guard variable. */
6253 guard = get_guard (decl);
6255 /* This optimization isn't safe on targets with relaxed memory
6256 consistency. On such targets we force synchronization in
6257 __cxa_guard_acquire. */
6258 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6260 /* Begin the conditional initialization. */
6261 if_stmt = begin_if_stmt ();
6262 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6263 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6266 if (flag_threadsafe_statics)
6268 guard_addr = build_address (guard);
6270 acquire_fn = get_identifier ("__cxa_guard_acquire");
6271 release_fn = get_identifier ("__cxa_guard_release");
6272 abort_fn = get_identifier ("__cxa_guard_abort");
6273 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6275 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6277 tree vfntype = build_function_type (void_type_node, argtypes);
6278 acquire_fn = push_library_fn
6279 (acquire_fn, build_function_type (integer_type_node, argtypes),
6281 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6282 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6286 release_fn = identifier_global_value (release_fn);
6287 abort_fn = identifier_global_value (abort_fn);
6290 inner_if_stmt = begin_if_stmt ();
6291 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6294 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6295 begin = get_target_expr (boolean_false_node);
6296 flag = TARGET_EXPR_SLOT (begin);
6298 TARGET_EXPR_CLEANUP (begin)
6299 = build3 (COND_EXPR, void_type_node, flag,
6301 build_call_n (abort_fn, 1, guard_addr));
6302 CLEANUP_EH_ONLY (begin) = 1;
6304 /* Do the initialization itself. */
6305 init = add_stmt_to_compound (begin, init);
6306 init = add_stmt_to_compound
6307 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6308 init = add_stmt_to_compound
6309 (init, build_call_n (release_fn, 1, guard_addr));
6312 init = add_stmt_to_compound (init, set_guard (guard));
6314 /* Use atexit to register a function for destroying this static
6316 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6318 finish_expr_stmt (init);
6320 if (flag_threadsafe_statics)
6322 finish_compound_stmt (inner_then_clause);
6323 finish_then_clause (inner_if_stmt);
6324 finish_if_stmt (inner_if_stmt);
6327 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6329 finish_compound_stmt (then_clause);
6330 finish_then_clause (if_stmt);
6331 finish_if_stmt (if_stmt);
6335 static_aggregates = tree_cons (init, decl, static_aggregates);
6339 /* Make TYPE a complete type based on INITIAL_VALUE.
6340 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6341 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6342 3 if the initializer list is empty (in pedantic mode). */
6345 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6348 tree type, elt_type;
6352 unsigned HOST_WIDE_INT i;
6355 /* An array of character type can be initialized from a
6356 brace-enclosed string constant.
6358 FIXME: this code is duplicated from reshape_init. Probably
6359 we should just call reshape_init here? */
6360 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6361 && TREE_CODE (initial_value) == CONSTRUCTOR
6362 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6364 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6365 tree value = VEC_index (constructor_elt, v, 0)->value;
6367 if (TREE_CODE (value) == STRING_CST
6368 && VEC_length (constructor_elt, v) == 1)
6369 initial_value = value;
6372 /* If any of the elements are parameter packs, we can't actually
6373 complete this type now because the array size is dependent. */
6374 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6376 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6379 if (PACK_EXPANSION_P (value))
6385 failure = complete_array_type (ptype, initial_value, do_default);
6387 /* We can create the array before the element type is complete, which
6388 means that we didn't have these two bits set in the original type
6389 either. In completing the type, we are expected to propagate these
6390 bits. See also complete_type which does the same thing for arrays
6393 if (TYPE_DOMAIN (type))
6395 elt_type = TREE_TYPE (type);
6396 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6397 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6398 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6404 /* Return zero if something is declared to be a member of type
6405 CTYPE when in the context of CUR_TYPE. STRING is the error
6406 message to print in that case. Otherwise, quietly return 1. */
6409 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6411 if (ctype && ctype != cur_type)
6413 if (flags == DTOR_FLAG)
6414 error ("destructor for alien class %qT cannot be a member", ctype);
6416 error ("constructor for alien class %qT cannot be a member", ctype);
6422 /* Subroutine of `grokdeclarator'. */
6424 /* Generate errors possibly applicable for a given set of specifiers.
6425 This is for ARM $7.1.2. */
6428 bad_specifiers (tree object,
6437 error ("%qD declared as a %<virtual%> %s", object, type);
6439 error ("%qD declared as an %<inline%> %s", object, type);
6441 error ("%<const%> and %<volatile%> function specifiers on "
6442 "%qD invalid in %s declaration",
6445 error ("%q+D declared as a friend", object);
6447 && (TREE_CODE (object) == TYPE_DECL
6448 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6449 && !TYPE_REFFN_P (TREE_TYPE (object))
6450 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6451 error ("%q+D declared with an exception specification", object);
6454 /* DECL is a member function or static data member and is presently
6455 being defined. Check that the definition is taking place in a
6459 check_class_member_definition_namespace (tree decl)
6461 /* These checks only apply to member functions and static data
6463 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6464 || TREE_CODE (decl) == VAR_DECL);
6465 /* We check for problems with specializations in pt.c in
6466 check_specialization_namespace, where we can issue better
6468 if (processing_specialization)
6470 /* There are no restrictions on the placement of
6471 explicit instantiations. */
6472 if (processing_explicit_instantiation)
6476 A member function definition that appears outside of the
6477 class definition shall appear in a namespace scope enclosing
6478 the class definition.
6482 The definition for a static data member shall appear in a
6483 namespace scope enclosing the member's class definition. */
6484 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6485 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6486 decl, DECL_CONTEXT (decl));
6489 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6490 METHOD_TYPE for a non-static member function; QUALS are the
6491 cv-qualifiers that apply to the function. */
6494 build_this_parm (tree type, cp_cv_quals quals)
6499 cp_cv_quals this_quals;
6501 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6502 /* The `this' parameter is implicitly `const'; it cannot be
6504 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6505 qual_type = cp_build_qualified_type (this_type, this_quals);
6506 parm = build_artificial_parm (this_identifier, qual_type);
6507 cp_apply_type_quals_to_decl (this_quals, parm);
6511 /* CTYPE is class type, or null if non-class.
6512 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6514 DECLARATOR is the function's name.
6515 PARMS is a chain of PARM_DECLs for the function.
6516 VIRTUALP is truthvalue of whether the function is virtual or not.
6517 FLAGS are to be passed through to `grokclassfn'.
6518 QUALS are qualifiers indicating whether the function is `const'
6520 RAISES is a list of exceptions that this function can raise.
6521 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6522 not look, and -1 if we should not call `grokclassfn' at all.
6524 SFK is the kind of special function (if any) for the new function.
6526 Returns `NULL_TREE' if something goes wrong, after issuing
6527 applicable error messages. */
6530 grokfndecl (tree ctype,
6534 tree orig_declarator,
6536 enum overload_flags flags,
6543 special_function_kind sfk,
6548 location_t location)
6551 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6555 type = build_exception_variant (type, raises);
6557 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6559 /* If we have an explicit location, use it, otherwise use whatever
6560 build_lang_decl used (probably input_location). */
6561 if (location != UNKNOWN_LOCATION)
6562 DECL_SOURCE_LOCATION (decl) = location;
6564 if (TREE_CODE (type) == METHOD_TYPE)
6567 parm = build_this_parm (type, quals);
6568 TREE_CHAIN (parm) = parms;
6571 DECL_ARGUMENTS (decl) = parms;
6572 for (t = parms; t; t = TREE_CHAIN (t))
6573 DECL_CONTEXT (t) = decl;
6574 /* Propagate volatile out from type to decl. */
6575 if (TYPE_VOLATILE (type))
6576 TREE_THIS_VOLATILE (decl) = 1;
6578 /* Setup decl according to sfk. */
6581 case sfk_constructor:
6582 case sfk_copy_constructor:
6583 DECL_CONSTRUCTOR_P (decl) = 1;
6585 case sfk_destructor:
6586 DECL_DESTRUCTOR_P (decl) = 1;
6592 /* If pointers to member functions use the least significant bit to
6593 indicate whether a function is virtual, ensure a pointer
6594 to this function will have that bit clear. */
6595 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6596 && TREE_CODE (type) == METHOD_TYPE
6597 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6598 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6601 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6605 ("defining explicit specialization %qD in friend declaration",
6609 tree fns = TREE_OPERAND (orig_declarator, 0);
6610 tree args = TREE_OPERAND (orig_declarator, 1);
6612 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6614 /* Something like `template <class T> friend void f<T>()'. */
6615 error ("invalid use of template-id %qD in declaration "
6616 "of primary template",
6622 /* A friend declaration of the form friend void f<>(). Record
6623 the information in the TEMPLATE_ID_EXPR. */
6624 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6626 if (TREE_CODE (fns) == COMPONENT_REF)
6628 /* Due to bison parser ickiness, we will have already looked
6629 up an operator_name or PFUNCNAME within the current class
6630 (see template_id in parse.y). If the current class contains
6631 such a name, we'll get a COMPONENT_REF here. Undo that. */
6633 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6634 == current_class_type);
6635 fns = TREE_OPERAND (fns, 1);
6637 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6638 || TREE_CODE (fns) == OVERLOAD);
6639 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6641 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6642 if (TREE_PURPOSE (t)
6643 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6645 error ("default arguments are not allowed in declaration "
6646 "of friend template specialization %qD",
6653 error ("%<inline%> is not allowed in declaration of friend "
6654 "template specialization %qD",
6661 /* If this decl has namespace scope, set that up. */
6663 set_decl_namespace (decl, in_namespace, friendp);
6665 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6667 /* `main' and builtins have implicit 'C' linkage. */
6668 if ((MAIN_NAME_P (declarator)
6669 || (IDENTIFIER_LENGTH (declarator) > 10
6670 && IDENTIFIER_POINTER (declarator)[0] == '_'
6671 && IDENTIFIER_POINTER (declarator)[1] == '_'
6672 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6673 && current_lang_name == lang_name_cplusplus
6674 && ctype == NULL_TREE
6675 /* NULL_TREE means global namespace. */
6676 && DECL_CONTEXT (decl) == NULL_TREE)
6677 SET_DECL_LANGUAGE (decl, lang_c);
6679 /* Should probably propagate const out from type to decl I bet (mrs). */
6682 DECL_STATIC_FUNCTION_P (decl) = 1;
6683 DECL_CONTEXT (decl) = ctype;
6688 DECL_CONTEXT (decl) = ctype;
6690 check_class_member_definition_namespace (decl);
6693 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6695 if (processing_template_decl)
6696 error ("cannot declare %<::main%> to be a template");
6698 error ("cannot declare %<::main%> to be inline");
6700 error ("cannot declare %<::main%> to be static");
6705 /* Members of anonymous types and local classes have no linkage; make
6706 them internal. If a typedef is made later, this will be changed. */
6707 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6708 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6713 /* [basic.link]: A name with no linkage (notably, the name of a class
6714 or enumeration declared in a local scope) shall not be used to
6715 declare an entity with linkage.
6717 Only check this for public decls for now. See core 319, 389. */
6718 t = no_linkage_check (TREE_TYPE (decl),
6719 /*relaxed_p=*/false);
6722 if (TYPE_ANONYMOUS_P (t))
6724 if (DECL_EXTERN_C_P (decl))
6725 /* Allow this; it's pretty common in C. */;
6728 permerror (input_location, "non-local function %q#D uses anonymous type",
6730 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6731 permerror (input_location, "%q+#D does not refer to the unqualified "
6732 "type, so it is not used for linkage",
6737 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6741 TREE_PUBLIC (decl) = publicp;
6744 DECL_INTERFACE_KNOWN (decl) = 1;
6745 DECL_NOT_REALLY_EXTERN (decl) = 1;
6748 /* If the declaration was declared inline, mark it as such. */
6750 DECL_DECLARED_INLINE_P (decl) = 1;
6752 DECL_EXTERNAL (decl) = 1;
6753 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6756 ? G_("static member function %qD cannot have cv-qualifier")
6757 : G_("non-member function %qD cannot have cv-qualifier"),
6759 quals = TYPE_UNQUALIFIED;
6762 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6763 && !grok_op_properties (decl, /*complain=*/true))
6766 if (ctype && decl_function_context (decl))
6767 DECL_NO_STATIC_CHAIN (decl) = 1;
6770 /* Make the init_value nonzero so pushdecl knows this is not
6771 tentative. error_mark_node is replaced later with the BLOCK. */
6772 DECL_INITIAL (decl) = error_mark_node;
6774 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6775 TREE_NOTHROW (decl) = 1;
6777 /* Caller will do the rest of this. */
6781 if (ctype != NULL_TREE)
6782 grokclassfn (ctype, decl, flags);
6784 decl = check_explicit_specialization (orig_declarator, decl,
6787 4 * (friendp != 0));
6788 if (decl == error_mark_node)
6793 cplus_decl_attributes (&decl, *attrlist, 0);
6794 *attrlist = NULL_TREE;
6797 /* Check main's type after attributes have been applied. */
6798 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6800 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6803 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6805 error ("%<::main%> must return %<int%>");
6806 newtype = build_function_type (integer_type_node, oldtypeargs);
6807 TREE_TYPE (decl) = newtype;
6810 check_main_parameter_types (decl);
6813 if (ctype != NULL_TREE
6814 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6817 tree old_decl = check_classfn (ctype, decl,
6818 (processing_template_decl
6819 > template_class_depth (ctype))
6820 ? current_template_parms
6823 if (old_decl == error_mark_node)
6831 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6832 /* Because grokfndecl is always supposed to return a
6833 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6834 here. We depend on our callers to figure out that its
6835 really a template that's being returned. */
6836 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6838 if (DECL_STATIC_FUNCTION_P (old_decl)
6839 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6840 /* Remove the `this' parm added by grokclassfn.
6841 XXX Isn't this done in start_function, too? */
6842 revert_static_member_fn (decl);
6843 if (DECL_ARTIFICIAL (old_decl))
6845 error ("definition of implicitly-declared %qD", old_decl);
6849 /* Since we've smashed OLD_DECL to its
6850 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6851 if (TREE_CODE (decl) == TEMPLATE_DECL)
6852 decl = DECL_TEMPLATE_RESULT (decl);
6854 /* Attempt to merge the declarations. This can fail, in
6855 the case of some invalid specialization declarations. */
6856 pushed_scope = push_scope (ctype);
6857 ok = duplicate_decls (decl, old_decl, friendp);
6859 pop_scope (pushed_scope);
6862 error ("no %q#D member function declared in class %qT",
6870 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6873 if (ctype == NULL_TREE || check)
6877 DECL_VIRTUAL_P (decl) = 1;
6882 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6883 the linkage that DECL will receive in the object file. */
6886 set_linkage_for_static_data_member (tree decl)
6888 /* A static data member always has static storage duration and
6889 external linkage. Note that static data members are forbidden in
6890 local classes -- the only situation in which a class has
6891 non-external linkage. */
6892 TREE_PUBLIC (decl) = 1;
6893 TREE_STATIC (decl) = 1;
6894 /* For non-template classes, static data members are always put
6895 out in exactly those files where they are defined, just as
6896 with ordinary namespace-scope variables. */
6897 if (!processing_template_decl)
6898 DECL_INTERFACE_KNOWN (decl) = 1;
6901 /* Create a VAR_DECL named NAME with the indicated TYPE.
6903 If SCOPE is non-NULL, it is the class type or namespace containing
6904 the variable. If SCOPE is NULL, the variable should is created in
6905 the innermost enclosings scope. */
6908 grokvardecl (tree type,
6910 const cp_decl_specifier_seq *declspecs,
6916 tree explicit_scope;
6918 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6920 /* Compute the scope in which to place the variable, but remember
6921 whether or not that scope was explicitly specified by the user. */
6922 explicit_scope = scope;
6925 /* An explicit "extern" specifier indicates a namespace-scope
6927 if (declspecs->storage_class == sc_extern)
6928 scope = current_namespace;
6929 else if (!at_function_scope_p ())
6930 scope = current_scope ();
6934 && (/* If the variable is a namespace-scope variable declared in a
6935 template, we need DECL_LANG_SPECIFIC. */
6936 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6937 /* Similarly for namespace-scope variables with language linkage
6939 || (TREE_CODE (scope) == NAMESPACE_DECL
6940 && current_lang_name != lang_name_cplusplus)
6941 /* Similarly for static data members. */
6943 decl = build_lang_decl (VAR_DECL, name, type);
6945 decl = build_decl (VAR_DECL, name, type);
6947 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6948 set_decl_namespace (decl, explicit_scope, 0);
6950 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6952 if (declspecs->storage_class == sc_extern)
6954 DECL_THIS_EXTERN (decl) = 1;
6955 DECL_EXTERNAL (decl) = !initialized;
6958 if (DECL_CLASS_SCOPE_P (decl))
6960 set_linkage_for_static_data_member (decl);
6961 /* This function is only called with out-of-class definitions. */
6962 DECL_EXTERNAL (decl) = 0;
6963 check_class_member_definition_namespace (decl);
6965 /* At top level, either `static' or no s.c. makes a definition
6966 (perhaps tentative), and absence of `static' makes it public. */
6967 else if (toplevel_bindings_p ())
6969 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6970 && (DECL_THIS_EXTERN (decl) || ! constp));
6971 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6973 /* Not at top level, only `static' makes a static definition. */
6976 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6977 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6980 if (declspecs->specs[(int)ds_thread])
6981 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6983 if (TREE_PUBLIC (decl))
6985 /* [basic.link]: A name with no linkage (notably, the name of a class
6986 or enumeration declared in a local scope) shall not be used to
6987 declare an entity with linkage.
6989 Only check this for public decls for now. */
6990 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6993 if (TYPE_ANONYMOUS_P (t))
6995 if (DECL_EXTERN_C_P (decl))
6996 /* Allow this; it's pretty common in C. */
7000 /* DRs 132, 319 and 389 seem to indicate types with
7001 no linkage can only be used to declare extern "C"
7002 entities. Since it's not always an error in the
7003 ISO C++ 90 Standard, we only issue a warning. */
7004 warning (0, "non-local variable %q#D uses anonymous type",
7006 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7007 warning (0, "%q+#D does not refer to the unqualified "
7008 "type, so it is not used for linkage",
7013 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
7017 DECL_INTERFACE_KNOWN (decl) = 1;
7022 /* Create and return a canonical pointer to member function type, for
7023 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7026 build_ptrmemfunc_type (tree type)
7030 tree unqualified_variant = NULL_TREE;
7032 if (type == error_mark_node)
7035 /* If a canonical type already exists for this type, use it. We use
7036 this method instead of type_hash_canon, because it only does a
7037 simple equality check on the list of field members. */
7039 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7042 /* Make sure that we always have the unqualified pointer-to-member
7044 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7046 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7048 t = make_class_type (RECORD_TYPE);
7049 xref_basetypes (t, NULL_TREE);
7051 /* Let the front end know this is a pointer to member function... */
7052 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7053 /* ... and not really a class type. */
7054 SET_CLASS_TYPE_P (t, 0);
7056 field = build_decl (FIELD_DECL, pfn_identifier, type);
7059 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
7060 TREE_CHAIN (field) = fields;
7063 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7065 /* Zap out the name so that the back end will give us the debugging
7066 information for this anonymous RECORD_TYPE. */
7067 TYPE_NAME (t) = NULL_TREE;
7069 /* If this is not the unqualified form of this pointer-to-member
7070 type, set the TYPE_MAIN_VARIANT for this type to be the
7071 unqualified type. Since they are actually RECORD_TYPEs that are
7072 not variants of each other, we must do this manually. */
7073 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7075 t = build_qualified_type (t, cp_type_quals (type));
7076 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7077 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7078 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7079 TREE_TYPE (TYPE_BINFO (t)) = t;
7082 /* Cache this pointer-to-member type so that we can find it again
7084 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7086 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7087 SET_TYPE_STRUCTURAL_EQUALITY (t);
7088 else if (TYPE_CANONICAL (type) != type)
7089 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7094 /* Create and return a pointer to data member type. */
7097 build_ptrmem_type (tree class_type, tree member_type)
7099 if (TREE_CODE (member_type) == METHOD_TYPE)
7103 arg_types = TYPE_ARG_TYPES (member_type);
7104 class_type = (cp_build_qualified_type
7106 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7108 = build_method_type_directly (class_type,
7109 TREE_TYPE (member_type),
7110 TREE_CHAIN (arg_types));
7111 return build_ptrmemfunc_type (build_pointer_type (member_type));
7115 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7116 return build_offset_type (class_type, member_type);
7120 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7121 Check to see that the definition is valid. Issue appropriate error
7122 messages. Return 1 if the definition is particularly bad, or 0
7126 check_static_variable_definition (tree decl, tree type)
7128 /* Motion 10 at San Diego: If a static const integral data member is
7129 initialized with an integral constant expression, the initializer
7130 may appear either in the declaration (within the class), or in
7131 the definition, but not both. If it appears in the class, the
7132 member is a member constant. The file-scope definition is always
7134 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7136 error ("invalid in-class initialization of static data member "
7137 "of non-integral type %qT",
7139 /* If we just return the declaration, crashes will sometimes
7140 occur. We therefore return void_type_node, as if this were a
7141 friend declaration, to cause callers to completely ignore
7142 this declaration. */
7145 else if (!CP_TYPE_CONST_P (type))
7146 error ("ISO C++ forbids in-class initialization of non-const "
7147 "static member %qD",
7149 else if (!INTEGRAL_TYPE_P (type))
7150 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7151 "%qD of non-integral type %qT", decl, type);
7156 /* Given the SIZE (i.e., number of elements) in an array, compute an
7157 appropriate index type for the array. If non-NULL, NAME is the
7158 name of the thing being declared. */
7161 compute_array_index_type (tree name, tree size)
7165 tree abi_1_itype = NULL_TREE;
7167 if (error_operand_p (size))
7168 return error_mark_node;
7170 type = TREE_TYPE (size);
7171 /* The array bound must be an integer type. */
7172 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7175 error ("size of array %qD has non-integral type %qT", name, type);
7177 error ("size of array has non-integral type %qT", type);
7178 size = integer_one_node;
7179 type = TREE_TYPE (size);
7182 /* We can only call value_dependent_expression_p on integral constant
7183 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7184 set if this isn't one. */
7185 if (processing_template_decl
7186 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7188 /* We cannot do any checking for a SIZE that isn't known to be
7189 constant. Just build the index type and mark that it requires
7190 structural equality checks. */
7191 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7192 size, integer_one_node));
7193 if (!TREE_SIDE_EFFECTS (size))
7195 TYPE_DEPENDENT_P (itype) = 1;
7196 TYPE_DEPENDENT_P_VALID (itype) = 1;
7198 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7202 if (!abi_version_at_least (2) && processing_template_decl)
7203 /* For abi-1, we handled all instances in templates the same way,
7204 even when they were non-dependent. This affects the manglings
7205 produced. So, we do the normal checking for non-dependent
7206 sizes, but at the end we'll return the same type that abi-1
7207 would have, but with TYPE_CANONICAL set to the "right"
7208 value that the current ABI would provide. */
7209 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7210 size, integer_one_node));
7212 /* The size might be the result of a cast. */
7213 STRIP_TYPE_NOPS (size);
7215 /* It might be a const variable or enumeration constant. */
7216 size = integral_constant_value (size);
7218 /* Normally, the array-bound will be a constant. */
7219 if (TREE_CODE (size) == INTEGER_CST)
7221 /* Check to see if the array bound overflowed. Make that an
7222 error, no matter how generous we're being. */
7223 constant_expression_error (size);
7225 /* An array must have a positive number of elements. */
7226 if (INT_CST_LT (size, integer_zero_node))
7229 error ("size of array %qD is negative", name);
7231 error ("size of array is negative");
7232 size = integer_one_node;
7234 /* As an extension we allow zero-sized arrays. We always allow
7235 them in system headers because glibc uses them. */
7236 else if (integer_zerop (size) && !in_system_header)
7239 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7241 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7244 else if (TREE_CONSTANT (size))
7246 /* `(int) &fn' is not a valid array bound. */
7248 error ("size of array %qD is not an integral constant-expression",
7251 error ("size of array is not an integral constant-expression");
7252 size = integer_one_node;
7254 else if (pedantic && warn_vla != 0)
7257 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7259 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7261 else if (warn_vla > 0)
7265 "variable length array %qD is used", name);
7268 "variable length array is used");
7271 if (processing_template_decl && !TREE_CONSTANT (size))
7272 /* A variable sized array. */
7273 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7276 HOST_WIDE_INT saved_processing_template_decl;
7278 /* Compute the index of the largest element in the array. It is
7279 one less than the number of elements in the array. We save
7280 and restore PROCESSING_TEMPLATE_DECL so that computations in
7281 cp_build_binary_op will be appropriately folded. */
7282 saved_processing_template_decl = processing_template_decl;
7283 processing_template_decl = 0;
7284 itype = cp_build_binary_op (input_location,
7286 cp_convert (ssizetype, size),
7287 cp_convert (ssizetype, integer_one_node),
7288 tf_warning_or_error);
7289 itype = fold (itype);
7290 processing_template_decl = saved_processing_template_decl;
7292 if (!TREE_CONSTANT (itype))
7293 /* A variable sized array. */
7294 itype = variable_size (itype);
7295 /* Make sure that there was no overflow when creating to a signed
7296 index type. (For example, on a 32-bit machine, an array with
7297 size 2^32 - 1 is too big.) */
7298 else if (TREE_CODE (itype) == INTEGER_CST
7299 && TREE_OVERFLOW (itype))
7301 error ("overflow in array dimension");
7302 TREE_OVERFLOW (itype) = 0;
7306 /* Create and return the appropriate index type. */
7309 tree t = build_index_type (itype);
7310 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7314 return build_index_type (itype);
7317 /* Returns the scope (if any) in which the entity declared by
7318 DECLARATOR will be located. If the entity was declared with an
7319 unqualified name, NULL_TREE is returned. */
7322 get_scope_of_declarator (const cp_declarator *declarator)
7324 while (declarator && declarator->kind != cdk_id)
7325 declarator = declarator->declarator;
7327 /* If the declarator-id is a SCOPE_REF, the scope in which the
7328 declaration occurs is the first operand. */
7330 && declarator->u.id.qualifying_scope)
7331 return declarator->u.id.qualifying_scope;
7333 /* Otherwise, the declarator is not a qualified name; the entity will
7334 be declared in the current scope. */
7338 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7339 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7343 create_array_type_for_decl (tree name, tree type, tree size)
7345 tree itype = NULL_TREE;
7346 const char* error_msg;
7348 /* If things have already gone awry, bail now. */
7349 if (type == error_mark_node || size == error_mark_node)
7350 return error_mark_node;
7352 /* Assume that everything will go OK. */
7355 /* There are some types which cannot be array elements. */
7356 switch (TREE_CODE (type))
7359 error_msg = "array of void";
7363 error_msg = "array of functions";
7366 case REFERENCE_TYPE:
7367 error_msg = "array of references";
7371 error_msg = "array of function members";
7378 /* If something went wrong, issue an error-message and return. */
7382 error ("declaration of %qD as %s", name, error_msg);
7384 error ("creating %s", error_msg);
7386 return error_mark_node;
7391 The constant expressions that specify the bounds of the arrays
7392 can be omitted only for the first member of the sequence. */
7393 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7396 error ("declaration of %qD as multidimensional array must "
7397 "have bounds for all dimensions except the first",
7400 error ("multidimensional array must have bounds for all "
7401 "dimensions except the first");
7403 return error_mark_node;
7406 /* Figure out the index type for the array. */
7408 itype = compute_array_index_type (name, size);
7411 T is called the array element type; this type shall not be [...] an
7412 abstract class type. */
7413 abstract_virtuals_error (name, type);
7415 return build_cplus_array_type (type, itype);
7418 /* Check that it's OK to declare a function with the indicated TYPE.
7419 SFK indicates the kind of special function (if any) that this
7420 function is. OPTYPE is the type given in a conversion operator
7421 declaration, or the class type for a constructor/destructor.
7422 Returns the actual return type of the function; that
7423 may be different than TYPE if an error occurs, or for certain
7424 special functions. */
7427 check_special_function_return_type (special_function_kind sfk,
7433 case sfk_constructor:
7435 error ("return type specification for constructor invalid");
7437 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7438 type = build_pointer_type (optype);
7440 type = void_type_node;
7443 case sfk_destructor:
7445 error ("return type specification for destructor invalid");
7446 /* We can't use the proper return type here because we run into
7447 problems with ambiguous bases and covariant returns.
7448 Java classes are left unchanged because (void *) isn't a valid
7449 Java type, and we don't want to change the Java ABI. */
7450 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7451 type = build_pointer_type (void_type_node);
7453 type = void_type_node;
7456 case sfk_conversion:
7458 error ("return type specified for %<operator %T%>", optype);
7469 /* A variable or data member (whose unqualified name is IDENTIFIER)
7470 has been declared with the indicated TYPE. If the TYPE is not
7471 acceptable, issue an error message and return a type to use for
7472 error-recovery purposes. */
7475 check_var_type (tree identifier, tree type)
7477 if (VOID_TYPE_P (type))
7480 error ("unnamed variable or field declared void");
7481 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7483 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7484 error ("variable or field %qE declared void", identifier);
7487 error ("variable or field declared void");
7488 type = error_mark_node;
7494 /* Given declspecs and a declarator (abstract or otherwise), determine
7495 the name and type of the object declared and construct a DECL node
7498 DECLSPECS points to the representation of declaration-specifier
7499 sequence that precedes declarator.
7501 DECL_CONTEXT says which syntactic context this declaration is in:
7502 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7503 FUNCDEF for a function definition. Like NORMAL but a few different
7504 error messages in each case. Return value may be zero meaning
7505 this definition is too screwy to try to parse.
7506 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7507 handle member functions (which have FIELD context).
7508 Return value may be zero meaning this definition is too screwy to
7510 PARM for a parameter declaration (either within a function prototype
7511 or before a function body). Make a PARM_DECL, or return void_type_node.
7512 CATCHPARM for a parameter declaration before a catch clause.
7513 TYPENAME if for a typename (in a cast or sizeof).
7514 Don't make a DECL node; just return the ..._TYPE node.
7515 FIELD for a struct or union field; make a FIELD_DECL.
7516 BITFIELD for a field with specified width.
7517 INITIALIZED is as for start_decl.
7519 ATTRLIST is a pointer to the list of attributes, which may be NULL
7520 if there are none; *ATTRLIST may be modified if attributes from inside
7521 the declarator should be applied to the declaration.
7523 When this function is called, scoping variables (such as
7524 CURRENT_CLASS_TYPE) should reflect the scope in which the
7525 declaration occurs, not the scope in which the new declaration will
7526 be placed. For example, on:
7530 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7533 Returns a DECL (if a declarator is present), a TYPE (if there is no
7534 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7538 grokdeclarator (const cp_declarator *declarator,
7539 const cp_decl_specifier_seq *declspecs,
7540 enum decl_context decl_context,
7544 tree type = NULL_TREE;
7546 int virtualp, explicitp, friendp, inlinep, staticp;
7547 int explicit_int = 0;
7548 int explicit_char = 0;
7549 int defaulted_int = 0;
7550 tree dependent_name = NULL_TREE;
7552 tree typedef_decl = NULL_TREE;
7553 const char *name = NULL;
7554 tree typedef_type = NULL_TREE;
7555 /* True if this declarator is a function definition. */
7556 bool funcdef_flag = false;
7557 cp_declarator_kind innermost_code = cdk_error;
7560 /* See the code below that used this. */
7561 tree decl_attr = NULL_TREE;
7564 /* Keep track of what sort of function is being processed
7565 so that we can warn about default return values, or explicit
7566 return values which do not match prescribed defaults. */
7567 special_function_kind sfk = sfk_none;
7569 tree dname = NULL_TREE;
7570 tree ctor_return_type = NULL_TREE;
7571 enum overload_flags flags = NO_SPECIAL;
7572 /* cv-qualifiers that apply to the declarator, for a declaration of
7573 a member function. */
7574 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7575 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7577 tree raises = NULL_TREE;
7578 int template_count = 0;
7579 tree returned_attrs = NULL_TREE;
7580 tree parms = NULL_TREE;
7581 const cp_declarator *id_declarator;
7582 /* The unqualified name of the declarator; either an
7583 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7584 tree unqualified_id;
7585 /* The class type, if any, in which this entity is located,
7586 or NULL_TREE if none. Note that this value may be different from
7587 the current class type; for example if an attempt is made to declare
7588 "A::f" inside "B", this value will be "A". */
7589 tree ctype = current_class_type;
7590 /* The NAMESPACE_DECL for the namespace in which this entity is
7591 located. If an unqualified name is used to declare the entity,
7592 this value will be NULL_TREE, even if the entity is located at
7594 tree in_namespace = NULL_TREE;
7595 cp_storage_class storage_class;
7596 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7597 bool type_was_error_mark_node = false;
7598 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7599 bool set_no_warning = false;
7601 signed_p = declspecs->specs[(int)ds_signed];
7602 unsigned_p = declspecs->specs[(int)ds_unsigned];
7603 short_p = declspecs->specs[(int)ds_short];
7604 long_p = declspecs->specs[(int)ds_long];
7605 longlong = declspecs->specs[(int)ds_long] >= 2;
7606 thread_p = declspecs->specs[(int)ds_thread];
7608 if (decl_context == FUNCDEF)
7609 funcdef_flag = true, decl_context = NORMAL;
7610 else if (decl_context == MEMFUNCDEF)
7611 funcdef_flag = true, decl_context = FIELD;
7612 else if (decl_context == BITFIELD)
7613 bitfield = 1, decl_context = FIELD;
7615 if (initialized > 1)
7616 funcdef_flag = true;
7618 /* Look inside a declarator for the name being declared
7619 and get it as a string, for an error message. */
7620 for (id_declarator = declarator;
7622 id_declarator = id_declarator->declarator)
7624 if (id_declarator->kind != cdk_id)
7625 innermost_code = id_declarator->kind;
7627 switch (id_declarator->kind)
7630 if (id_declarator->declarator
7631 && id_declarator->declarator->kind == cdk_id)
7633 sfk = id_declarator->declarator->u.id.sfk;
7634 if (sfk == sfk_destructor)
7641 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7642 tree decl = id_declarator->u.id.unqualified_name;
7645 if (qualifying_scope)
7647 if (at_function_scope_p ())
7651 A declarator-id shall not be qualified except
7654 None of the cases are permitted in block
7656 if (qualifying_scope == global_namespace)
7657 error ("invalid use of qualified-name %<::%D%>",
7659 else if (TYPE_P (qualifying_scope))
7660 error ("invalid use of qualified-name %<%T::%D%>",
7661 qualifying_scope, decl);
7663 error ("invalid use of qualified-name %<%D::%D%>",
7664 qualifying_scope, decl);
7665 return error_mark_node;
7667 else if (TYPE_P (qualifying_scope))
7669 ctype = qualifying_scope;
7670 if (innermost_code != cdk_function
7671 && current_class_type
7672 && !UNIQUELY_DERIVED_FROM_P (ctype,
7673 current_class_type))
7675 error ("type %qT is not derived from type %qT",
7676 ctype, current_class_type);
7677 return error_mark_node;
7680 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7681 in_namespace = qualifying_scope;
7683 switch (TREE_CODE (decl))
7689 if (innermost_code != cdk_function)
7691 error ("declaration of %qD as non-function", decl);
7692 return error_mark_node;
7694 else if (!qualifying_scope
7695 && !(current_class_type && at_class_scope_p ()))
7697 error ("declaration of %qD as non-member", decl);
7698 return error_mark_node;
7701 type = TREE_OPERAND (decl, 0);
7703 type = constructor_name (type);
7704 name = IDENTIFIER_POINTER (type);
7709 case TEMPLATE_ID_EXPR:
7711 tree fns = TREE_OPERAND (decl, 0);
7714 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7716 gcc_assert (is_overloaded_fn (dname));
7717 dname = DECL_NAME (get_first_fn (dname));
7722 case IDENTIFIER_NODE:
7723 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7726 if (C_IS_RESERVED_WORD (dname))
7728 error ("declarator-id missing; using reserved word %qD",
7730 name = IDENTIFIER_POINTER (dname);
7732 else if (!IDENTIFIER_TYPENAME_P (dname))
7733 name = IDENTIFIER_POINTER (dname);
7736 gcc_assert (flags == NO_SPECIAL);
7737 flags = TYPENAME_FLAG;
7738 ctor_return_type = TREE_TYPE (dname);
7739 sfk = sfk_conversion;
7740 if (is_typename_at_global_scope (dname))
7741 name = IDENTIFIER_POINTER (dname);
7743 name = "<invalid operator>";
7760 return error_mark_node;
7765 if (id_declarator->kind == cdk_id)
7771 The declarator in a function-definition shall have the form
7772 D1 ( parameter-declaration-clause) ... */
7773 if (funcdef_flag && innermost_code != cdk_function)
7775 error ("function definition does not declare parameters");
7776 return error_mark_node;
7779 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7780 && innermost_code != cdk_function
7781 && ! (ctype && !declspecs->any_specifiers_p))
7783 error ("declaration of %qD as non-function", dname);
7784 return error_mark_node;
7787 /* Anything declared one level down from the top level
7788 must be one of the parameters of a function
7789 (because the body is at least two levels down). */
7791 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7792 by not allowing C++ class definitions to specify their parameters
7793 with xdecls (must be spec.d in the parmlist).
7795 Since we now wait to push a class scope until we are sure that
7796 we are in a legitimate method context, we must set oldcname
7797 explicitly (since current_class_name is not yet alive).
7799 We also want to avoid calling this a PARM if it is in a namespace. */
7801 if (decl_context == NORMAL && !toplevel_bindings_p ())
7803 struct cp_binding_level *b = current_binding_level;
7804 current_binding_level = b->level_chain;
7805 if (current_binding_level != 0 && toplevel_bindings_p ())
7806 decl_context = PARM;
7807 current_binding_level = b;
7811 name = decl_context == PARM ? "parameter" : "type name";
7813 /* If there were multiple types specified in the decl-specifier-seq,
7814 issue an error message. */
7815 if (declspecs->multiple_types_p)
7817 error ("two or more data types in declaration of %qs", name);
7818 return error_mark_node;
7821 if (declspecs->conflicting_specifiers_p)
7823 error ("conflicting specifiers in declaration of %qs", name);
7824 return error_mark_node;
7827 /* Extract the basic type from the decl-specifier-seq. */
7828 type = declspecs->type;
7829 if (type == error_mark_node)
7832 type_was_error_mark_node = true;
7834 /* If the entire declaration is itself tagged as deprecated then
7835 suppress reports of deprecated items. */
7836 if (type && TREE_DEPRECATED (type)
7837 && deprecated_state != DEPRECATED_SUPPRESS)
7838 warn_deprecated_use (type);
7839 if (type && TREE_CODE (type) == TYPE_DECL)
7841 typedef_decl = type;
7842 type = TREE_TYPE (typedef_decl);
7843 if (TREE_DEPRECATED (type)
7844 && DECL_ARTIFICIAL (typedef_decl)
7845 && deprecated_state != DEPRECATED_SUPPRESS)
7846 warn_deprecated_use (type);
7848 /* No type at all: default to `int', and set DEFAULTED_INT
7849 because it was not a user-defined typedef. */
7850 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7852 /* These imply 'int'. */
7853 type = integer_type_node;
7857 explicit_int = declspecs->explicit_int_p;
7858 explicit_char = declspecs->explicit_char_p;
7861 /* See the code below that used this. */
7863 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7865 typedef_type = type;
7868 if (sfk != sfk_conversion)
7869 ctor_return_type = ctype;
7871 if (sfk != sfk_none)
7872 type = check_special_function_return_type (sfk, type,
7874 else if (type == NULL_TREE)
7880 /* We handle `main' specially here, because 'main () { }' is so
7881 common. With no options, it is allowed. With -Wreturn-type,
7882 it is a warning. It is only an error with -pedantic-errors. */
7883 is_main = (funcdef_flag
7884 && dname && MAIN_NAME_P (dname)
7885 && ctype == NULL_TREE
7886 && in_namespace == NULL_TREE
7887 && current_namespace == global_namespace);
7889 if (type_was_error_mark_node)
7890 /* We've already issued an error, don't complain more. */;
7891 else if (in_system_header || flag_ms_extensions)
7892 /* Allow it, sigh. */;
7894 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7896 pedwarn (input_location, OPT_pedantic,
7897 "ISO C++ forbids declaration of %qs with no type", name);
7899 warning (OPT_Wreturn_type,
7900 "ISO C++ forbids declaration of %qs with no type", name);
7902 type = integer_type_node;
7907 /* Now process the modifiers that were specified
7908 and check for invalid combinations. */
7910 /* Long double is a special combination. */
7911 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7914 type = build_qualified_type (long_double_type_node,
7915 cp_type_quals (type));
7918 /* Check all other uses of type modifiers. */
7920 if (unsigned_p || signed_p || long_p || short_p)
7924 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7925 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7926 else if (signed_p && unsigned_p)
7927 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7928 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7929 error ("%<long long%> invalid for %qs", name);
7930 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7931 error ("%<long%> invalid for %qs", name);
7932 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7933 error ("%<short%> invalid for %qs", name);
7934 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7935 error ("%<long%> or %<short%> invalid for %qs", name);
7936 else if ((long_p || short_p) && explicit_char)
7937 error ("%<long%> or %<short%> specified with char for %qs", name);
7938 else if (long_p && short_p)
7939 error ("%<long%> and %<short%> specified together for %qs", name);
7940 else if (type == char16_type_node || type == char32_type_node)
7942 if (signed_p || unsigned_p)
7943 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7944 else if (short_p || long_p)
7945 error ("%<short%> or %<long%> invalid for %qs", name);
7950 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7952 pedwarn (input_location, OPT_pedantic,
7953 "long, short, signed or unsigned used invalidly for %qs",
7955 if (flag_pedantic_errors)
7960 /* Discard the type modifiers if they are invalid. */
7971 /* Decide whether an integer type is signed or not.
7972 Optionally treat bitfields as signed by default. */
7976 It is implementation-defined whether a plain (neither
7977 explicitly signed or unsigned) char, short, int, or long
7978 bit-field is signed or unsigned.
7980 Naturally, we extend this to long long as well. Note that
7981 this does not include wchar_t. */
7982 || (bitfield && !flag_signed_bitfields
7984 /* A typedef for plain `int' without `signed' can be
7985 controlled just like plain `int', but a typedef for
7986 `signed int' cannot be so controlled. */
7988 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7989 && TREE_CODE (type) == INTEGER_TYPE
7990 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7993 type = long_long_unsigned_type_node;
7995 type = long_unsigned_type_node;
7997 type = short_unsigned_type_node;
7998 else if (type == char_type_node)
7999 type = unsigned_char_type_node;
8000 else if (typedef_decl)
8001 type = unsigned_type_for (type);
8003 type = unsigned_type_node;
8005 else if (signed_p && type == char_type_node)
8006 type = signed_char_type_node;
8008 type = long_long_integer_type_node;
8010 type = long_integer_type_node;
8012 type = short_integer_type_node;
8014 if (declspecs->specs[(int)ds_complex])
8016 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8017 error ("complex invalid for %qs", name);
8018 /* If we just have "complex", it is equivalent to
8019 "complex double", but if any modifiers at all are specified it is
8020 the complex form of TYPE. E.g, "complex short" is
8021 "complex short int". */
8023 else if (defaulted_int && ! longlong
8024 && ! (long_p || short_p || signed_p || unsigned_p))
8025 type = complex_double_type_node;
8026 else if (type == integer_type_node)
8027 type = complex_integer_type_node;
8028 else if (type == float_type_node)
8029 type = complex_float_type_node;
8030 else if (type == double_type_node)
8031 type = complex_double_type_node;
8032 else if (type == long_double_type_node)
8033 type = complex_long_double_type_node;
8035 type = build_complex_type (type);
8038 type_quals = TYPE_UNQUALIFIED;
8039 if (declspecs->specs[(int)ds_const])
8040 type_quals |= TYPE_QUAL_CONST;
8041 if (declspecs->specs[(int)ds_volatile])
8042 type_quals |= TYPE_QUAL_VOLATILE;
8043 if (declspecs->specs[(int)ds_restrict])
8044 type_quals |= TYPE_QUAL_RESTRICT;
8045 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8046 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8049 if (TREE_CODE (type) == FUNCTION_TYPE
8050 && type_quals != TYPE_UNQUALIFIED)
8052 /* This was an error in C++98 (cv-qualifiers cannot be added to
8053 a function type), but DR 295 makes the code well-formed by
8054 dropping the extra qualifiers. */
8057 tree bad_type = build_qualified_type (type, type_quals);
8058 pedwarn (input_location, OPT_pedantic,
8059 "ignoring %qV qualifiers added to function type %qT",
8062 type_quals = TYPE_UNQUALIFIED;
8064 type_quals |= cp_type_quals (type);
8065 type = cp_build_qualified_type_real
8066 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8067 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8068 /* We might have ignored or rejected some of the qualifiers. */
8069 type_quals = cp_type_quals (type);
8072 inlinep = !! declspecs->specs[(int)ds_inline];
8073 virtualp = !! declspecs->specs[(int)ds_virtual];
8074 explicitp = !! declspecs->specs[(int)ds_explicit];
8076 storage_class = declspecs->storage_class;
8077 if (storage_class == sc_static)
8078 staticp = 1 + (decl_context == FIELD);
8080 if (virtualp && staticp == 2)
8082 error ("member %qD cannot be declared both virtual and static", dname);
8083 storage_class = sc_none;
8086 friendp = !! declspecs->specs[(int)ds_friend];
8088 if (dependent_name && !friendp)
8090 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8091 return error_mark_node;
8094 /* Issue errors about use of storage classes for parameters. */
8095 if (decl_context == PARM)
8097 if (declspecs->specs[(int)ds_typedef])
8099 error ("typedef declaration invalid in parameter declaration");
8100 return error_mark_node;
8102 else if (storage_class == sc_static
8103 || storage_class == sc_extern
8105 error ("storage class specifiers invalid in parameter declarations");
8107 if (type_uses_auto (type))
8109 error ("parameter declared %<auto%>");
8110 type = error_mark_node;
8114 /* Give error if `virtual' is used outside of class declaration. */
8116 && (current_class_name == NULL_TREE || decl_context != FIELD))
8118 error ("%<virtual%> outside class declaration");
8122 /* Static anonymous unions are dealt with here. */
8123 if (staticp && decl_context == TYPENAME
8125 && ANON_AGGR_TYPE_P (declspecs->type))
8126 decl_context = FIELD;
8128 /* Warn about storage classes that are invalid for certain
8129 kinds of declarations (parameters, typenames, etc.). */
8132 && storage_class != sc_extern
8133 && storage_class != sc_static)
8134 || declspecs->specs[(int)ds_typedef]))
8136 error ("multiple storage classes in declaration of %qs", name);
8139 if (decl_context != NORMAL
8140 && ((storage_class != sc_none
8141 && storage_class != sc_mutable)
8144 if ((decl_context == PARM || decl_context == CATCHPARM)
8145 && (storage_class == sc_register
8146 || storage_class == sc_auto))
8148 else if (declspecs->specs[(int)ds_typedef])
8150 else if (decl_context == FIELD
8151 /* C++ allows static class elements. */
8152 && storage_class == sc_static)
8153 /* C++ also allows inlines and signed and unsigned elements,
8154 but in those cases we don't come in here. */
8158 if (decl_context == FIELD)
8159 error ("storage class specified for %qs", name);
8162 if (decl_context == PARM || decl_context == CATCHPARM)
8163 error ("storage class specified for parameter %qs", name);
8165 error ("storage class specified for typename");
8167 if (storage_class == sc_register
8168 || storage_class == sc_auto
8169 || storage_class == sc_extern
8171 storage_class = sc_none;
8174 else if (storage_class == sc_extern && funcdef_flag
8175 && ! toplevel_bindings_p ())
8176 error ("nested function %qs declared %<extern%>", name);
8177 else if (toplevel_bindings_p ())
8179 if (storage_class == sc_auto)
8180 error ("top-level declaration of %qs specifies %<auto%>", name);
8183 && storage_class != sc_extern
8184 && storage_class != sc_static)
8186 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8191 if (storage_class && friendp)
8193 error ("storage class specifiers invalid in friend function declarations");
8194 storage_class = sc_none;
8199 unqualified_id = NULL_TREE;
8202 unqualified_id = id_declarator->u.id.unqualified_name;
8203 switch (TREE_CODE (unqualified_id))
8206 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8207 if (TYPE_P (unqualified_id))
8208 unqualified_id = constructor_name (unqualified_id);
8211 case IDENTIFIER_NODE:
8212 case TEMPLATE_ID_EXPR:
8220 /* Determine the type of the entity declared by recurring on the
8222 for (; declarator; declarator = declarator->declarator)
8224 const cp_declarator *inner_declarator;
8227 if (type == error_mark_node)
8228 return error_mark_node;
8230 attrs = declarator->attributes;
8236 if (declarator == NULL || declarator->kind == cdk_id)
8237 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8238 if (declarator->kind == cdk_function)
8239 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8240 if (declarator->kind == cdk_array)
8241 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8242 returned_attrs = decl_attributes (&type,
8243 chainon (returned_attrs, attrs),
8247 if (declarator->kind == cdk_id)
8250 inner_declarator = declarator->declarator;
8252 switch (declarator->kind)
8255 type = create_array_type_for_decl (dname, type,
8256 declarator->u.array.bounds);
8264 /* Declaring a function type.
8265 Make sure we have a valid type for the function to return. */
8267 if (type_quals != TYPE_UNQUALIFIED)
8269 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8270 warning (OPT_Wignored_qualifiers,
8271 "type qualifiers ignored on function return type");
8272 /* We now know that the TYPE_QUALS don't apply to the
8273 decl, but to its return type. */
8274 type_quals = TYPE_UNQUALIFIED;
8275 set_no_warning = true;
8278 /* Error about some types functions can't return. */
8280 if (TREE_CODE (type) == FUNCTION_TYPE)
8282 error ("%qs declared as function returning a function", name);
8283 return error_mark_node;
8285 if (TREE_CODE (type) == ARRAY_TYPE)
8287 error ("%qs declared as function returning an array", name);
8288 return error_mark_node;
8291 /* Pick up type qualifiers which should be applied to `this'. */
8292 memfn_quals = declarator->u.function.qualifiers;
8294 /* Pick up the exception specifications. */
8295 raises = declarator->u.function.exception_specification;
8297 /* Say it's a definition only for the CALL_EXPR
8298 closest to the identifier. */
8299 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8301 /* Handle a late-specified return type. */
8304 if (type_uses_auto (type))
8306 if (!declarator->u.function.late_return_type)
8308 error ("%qs function uses %<auto%> type specifier without"
8309 " late return type", name);
8310 return error_mark_node;
8312 else if (!is_auto (type))
8314 error ("%qs function with late return type has"
8315 " %qT as its type rather than plain %<auto%>",
8317 return error_mark_node;
8320 else if (declarator->u.function.late_return_type)
8322 error ("%qs function with late return type not declared"
8323 " with %<auto%> type specifier", name);
8324 return error_mark_node;
8327 type = splice_late_return_type
8328 (type, declarator->u.function.late_return_type);
8329 if (type == error_mark_node)
8330 return error_mark_node;
8332 if (ctype == NULL_TREE
8333 && decl_context == FIELD
8335 && (friendp == 0 || dname == current_class_name))
8336 ctype = current_class_type;
8338 if (ctype && (sfk == sfk_constructor
8339 || sfk == sfk_destructor))
8341 /* We are within a class's scope. If our declarator name
8342 is the same as the class name, and we are defining
8343 a function, then it is a constructor/destructor, and
8344 therefore returns a void type. */
8346 /* ISO C++ 12.4/2. A destructor may not be declared
8347 const or volatile. A destructor may not be
8350 ISO C++ 12.1. A constructor may not be declared
8351 const or volatile. A constructor may not be
8352 virtual. A constructor may not be static. */
8354 error ((flags == DTOR_FLAG)
8355 ? "destructor cannot be static member function"
8356 : "constructor cannot be static member function");
8359 error ((flags == DTOR_FLAG)
8360 ? "destructors may not be cv-qualified"
8361 : "constructors may not be cv-qualified");
8362 memfn_quals = TYPE_UNQUALIFIED;
8365 if (decl_context == FIELD
8366 && !member_function_or_else (ctype,
8369 return error_mark_node;
8371 if (flags != DTOR_FLAG)
8373 /* It's a constructor. */
8378 permerror (input_location, "constructors cannot be declared virtual");
8381 if (decl_context == FIELD
8382 && sfk != sfk_constructor)
8383 return error_mark_node;
8385 if (decl_context == FIELD)
8391 error ("can't initialize friend function %qs", name);
8394 /* Cannot be both friend and virtual. */
8395 error ("virtual functions cannot be friends");
8398 if (decl_context == NORMAL)
8399 error ("friend declaration not in class definition");
8400 if (current_function_decl && funcdef_flag)
8401 error ("can't define friend function %qs in a local "
8406 arg_types = grokparms (declarator->u.function.parameters,
8409 if (inner_declarator
8410 && inner_declarator->kind == cdk_id
8411 && inner_declarator->u.id.sfk == sfk_destructor
8412 && arg_types != void_list_node)
8414 error ("destructors may not have parameters");
8415 arg_types = void_list_node;
8419 type = build_function_type (type, arg_types);
8426 /* Filter out pointers-to-references and references-to-references.
8427 We can get these if a TYPE_DECL is used. */
8429 if (TREE_CODE (type) == REFERENCE_TYPE)
8431 if (declarator->kind != cdk_reference)
8433 error ("cannot declare pointer to %q#T", type);
8434 type = TREE_TYPE (type);
8437 /* In C++0x, we allow reference to reference declarations
8438 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8439 and template type arguments [14.3.1/4 temp.arg.type]. The
8440 check for direct reference to reference declarations, which
8441 are still forbidden, occurs below. Reasoning behind the change
8442 can be found in DR106, DR540, and the rvalue reference
8444 else if (cxx_dialect == cxx98)
8446 error ("cannot declare reference to %q#T", type);
8447 type = TREE_TYPE (type);
8450 else if (VOID_TYPE_P (type))
8452 if (declarator->kind == cdk_reference)
8453 error ("cannot declare reference to %q#T", type);
8454 else if (declarator->kind == cdk_ptrmem)
8455 error ("cannot declare pointer to %q#T member", type);
8458 /* We now know that the TYPE_QUALS don't apply to the decl,
8459 but to the target of the pointer. */
8460 type_quals = TYPE_UNQUALIFIED;
8462 if (declarator->kind == cdk_ptrmem
8463 && (TREE_CODE (type) == FUNCTION_TYPE
8464 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8466 memfn_quals |= cp_type_quals (type);
8467 type = build_memfn_type (type,
8468 declarator->u.pointer.class_type,
8470 memfn_quals = TYPE_UNQUALIFIED;
8473 if (declarator->kind == cdk_reference)
8475 /* In C++0x, the type we are creating a reference to might be
8476 a typedef which is itself a reference type. In that case,
8477 we follow the reference collapsing rules in
8478 [7.1.3/8 dcl.typedef] to create the final reference type:
8480 "If a typedef TD names a type that is a reference to a type
8481 T, an attempt to create the type 'lvalue reference to cv TD'
8482 creates the type 'lvalue reference to T,' while an attempt
8483 to create the type "rvalue reference to cv TD' creates the
8486 if (!VOID_TYPE_P (type))
8487 type = cp_build_reference_type
8488 ((TREE_CODE (type) == REFERENCE_TYPE
8489 ? TREE_TYPE (type) : type),
8490 (declarator->u.reference.rvalue_ref
8491 && (TREE_CODE(type) != REFERENCE_TYPE
8492 || TYPE_REF_IS_RVALUE (type))));
8494 /* In C++0x, we need this check for direct reference to
8495 reference declarations, which are forbidden by
8496 [8.3.2/5 dcl.ref]. Reference to reference declarations
8497 are only allowed indirectly through typedefs and template
8498 type arguments. Example:
8500 void foo(int & &); // invalid ref-to-ref decl
8502 typedef int & int_ref;
8503 void foo(int_ref &); // valid ref-to-ref decl
8505 if (inner_declarator && inner_declarator->kind == cdk_reference)
8506 error ("cannot declare reference to %q#T, which is not "
8507 "a typedef or a template type argument", type);
8509 else if (TREE_CODE (type) == METHOD_TYPE)
8510 type = build_ptrmemfunc_type (build_pointer_type (type));
8511 else if (declarator->kind == cdk_ptrmem)
8513 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8515 if (declarator->u.pointer.class_type == error_mark_node)
8516 /* We will already have complained. */
8517 type = error_mark_node;
8519 type = build_ptrmem_type (declarator->u.pointer.class_type,
8523 type = build_pointer_type (type);
8525 /* Process a list of type modifier keywords (such as
8526 const or volatile) that were given inside the `*' or `&'. */
8528 if (declarator->u.pointer.qualifiers)
8531 = cp_build_qualified_type (type,
8532 declarator->u.pointer.qualifiers);
8533 type_quals = cp_type_quals (type);
8546 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8547 && TREE_CODE (type) != FUNCTION_TYPE
8548 && TREE_CODE (type) != METHOD_TYPE)
8550 error ("template-id %qD used as a declarator",
8552 unqualified_id = dname;
8555 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8556 qualified with a class-name, turn it into a METHOD_TYPE, unless
8557 we know that the function is static. We take advantage of this
8558 opportunity to do other processing that pertains to entities
8559 explicitly declared to be class members. Note that if DECLARATOR
8560 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8561 would not have exited the loop above. */
8563 && declarator->u.id.qualifying_scope
8564 && TYPE_P (declarator->u.id.qualifying_scope))
8568 ctype = declarator->u.id.qualifying_scope;
8569 ctype = TYPE_MAIN_VARIANT (ctype);
8571 while (t != NULL_TREE && CLASS_TYPE_P (t))
8573 /* You're supposed to have one `template <...>' for every
8574 template class, but you don't need one for a full
8575 specialization. For example:
8577 template <class T> struct S{};
8578 template <> struct S<int> { void f(); };
8579 void S<int>::f () {}
8581 is correct; there shouldn't be a `template <>' for the
8582 definition of `S<int>::f'. */
8583 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8584 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8585 /* T is an explicit (not partial) specialization. All
8586 containing classes must therefore also be explicitly
8589 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8590 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8591 template_count += 1;
8593 t = TYPE_MAIN_DECL (t);
8594 t = DECL_CONTEXT (t);
8597 if (ctype == current_class_type)
8601 permerror (input_location, "member functions are implicitly friends of their class");
8605 permerror (declarator->id_loc,
8606 "extra qualification %<%T::%> on member %qs",
8609 else if (/* If the qualifying type is already complete, then we
8610 can skip the following checks. */
8611 !COMPLETE_TYPE_P (ctype)
8612 && (/* If the function is being defined, then
8613 qualifying type must certainly be complete. */
8615 /* A friend declaration of "T::f" is OK, even if
8616 "T" is a template parameter. But, if this
8617 function is not a friend, the qualifying type
8619 || (!friendp && !CLASS_TYPE_P (ctype))
8620 /* For a declaration, the type need not be
8621 complete, if either it is dependent (since there
8622 is no meaningful definition of complete in that
8623 case) or the qualifying class is currently being
8625 || !(dependent_type_p (ctype)
8626 || currently_open_class (ctype)))
8627 /* Check that the qualifying type is complete. */
8628 && !complete_type_or_else (ctype, NULL_TREE))
8629 return error_mark_node;
8630 else if (TREE_CODE (type) == FUNCTION_TYPE)
8632 tree sname = declarator->u.id.unqualified_name;
8634 if (current_class_type
8635 && (!friendp || funcdef_flag))
8638 ? "cannot define member function %<%T::%s%> within %<%T%>"
8639 : "cannot declare member function %<%T::%s%> within %<%T%>",
8640 ctype, name, current_class_type);
8641 return error_mark_node;
8644 if (TREE_CODE (sname) == IDENTIFIER_NODE
8645 && NEW_DELETE_OPNAME_P (sname))
8646 /* Overloaded operator new and operator delete
8647 are always static functions. */
8650 type = build_memfn_type (type, ctype, memfn_quals);
8652 else if (declspecs->specs[(int)ds_typedef]
8653 && current_class_type)
8655 error ("cannot declare member %<%T::%s%> within %qT",
8656 ctype, name, current_class_type);
8657 return error_mark_node;
8661 /* Now TYPE has the actual type. */
8666 *attrlist = chainon (returned_attrs, *attrlist);
8668 attrlist = &returned_attrs;
8671 /* Handle parameter packs. */
8672 if (parameter_pack_p)
8674 if (decl_context == PARM)
8675 /* Turn the type into a pack expansion.*/
8676 type = make_pack_expansion (type);
8678 error ("non-parameter %qs cannot be a parameter pack", name);
8681 /* Did array size calculations overflow? */
8683 if (TREE_CODE (type) == ARRAY_TYPE
8684 && COMPLETE_TYPE_P (type)
8685 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8686 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8688 error ("size of array %qs is too large", name);
8689 /* If we proceed with the array type as it is, we'll eventually
8690 crash in tree_low_cst(). */
8691 type = error_mark_node;
8694 if ((decl_context == FIELD || decl_context == PARM)
8695 && !processing_template_decl
8696 && variably_modified_type_p (type, NULL_TREE))
8698 if (decl_context == FIELD)
8699 error ("data member may not have variably modified type %qT", type);
8701 error ("parameter may not have variably modified type %qT", type);
8702 type = error_mark_node;
8705 if (explicitp == 1 || (explicitp && friendp))
8707 /* [dcl.fct.spec] The explicit specifier shall only be used in
8708 declarations of constructors within a class definition. */
8709 error ("only declarations of constructors can be %<explicit%>");
8713 if (storage_class == sc_mutable)
8715 if (decl_context != FIELD || friendp)
8717 error ("non-member %qs cannot be declared %<mutable%>", name);
8718 storage_class = sc_none;
8720 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8722 error ("non-object member %qs cannot be declared %<mutable%>", name);
8723 storage_class = sc_none;
8725 else if (TREE_CODE (type) == FUNCTION_TYPE
8726 || TREE_CODE (type) == METHOD_TYPE)
8728 error ("function %qs cannot be declared %<mutable%>", name);
8729 storage_class = sc_none;
8733 error ("static %qs cannot be declared %<mutable%>", name);
8734 storage_class = sc_none;
8736 else if (type_quals & TYPE_QUAL_CONST)
8738 error ("const %qs cannot be declared %<mutable%>", name);
8739 storage_class = sc_none;
8743 /* If this is declaring a typedef name, return a TYPE_DECL. */
8744 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8748 /* Note that the grammar rejects storage classes
8749 in typenames, fields or parameters. */
8750 if (current_lang_name == lang_name_java)
8751 TYPE_FOR_JAVA (type) = 1;
8753 /* This declaration:
8755 typedef void f(int) const;
8757 declares a function type which is not a member of any
8758 particular class, but which is cv-qualified; for
8759 example "f S::*" declares a pointer to a const-qualified
8760 member function of S. We record the cv-qualification in the
8762 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8764 type = cp_build_qualified_type (type, memfn_quals);
8766 /* We have now dealt with these qualifiers. */
8767 memfn_quals = TYPE_UNQUALIFIED;
8770 if (decl_context == FIELD)
8771 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8773 decl = build_decl (TYPE_DECL, unqualified_id, type);
8774 if (id_declarator && declarator->u.id.qualifying_scope) {
8775 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8776 TREE_TYPE (decl) = error_mark_node;
8779 if (decl_context != FIELD)
8781 if (!current_function_decl)
8782 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8783 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8784 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8785 (current_function_decl)))
8786 /* The TYPE_DECL is "abstract" because there will be
8787 clones of this constructor/destructor, and there will
8788 be copies of this TYPE_DECL generated in those
8790 DECL_ABSTRACT (decl) = 1;
8792 else if (constructor_name_p (unqualified_id, current_class_type))
8793 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8794 "as enclosing class",
8797 /* If the user declares "typedef struct {...} foo" then the
8798 struct will have an anonymous name. Fill that name in now.
8799 Nothing can refer to it, so nothing needs know about the name
8801 if (type != error_mark_node
8804 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8805 && TYPE_ANONYMOUS_P (type)
8806 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8808 tree oldname = TYPE_NAME (type);
8811 /* Replace the anonymous name with the real name everywhere. */
8812 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8813 if (TYPE_NAME (t) == oldname)
8814 TYPE_NAME (t) = decl;
8816 if (TYPE_LANG_SPECIFIC (type))
8817 TYPE_WAS_ANONYMOUS (type) = 1;
8819 /* If this is a typedef within a template class, the nested
8820 type is a (non-primary) template. The name for the
8821 template needs updating as well. */
8822 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8823 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8824 = TYPE_IDENTIFIER (type);
8826 /* FIXME remangle member functions; member functions of a
8827 type with external linkage have external linkage. */
8831 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8832 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8834 bad_specifiers (decl, "type", virtualp,
8835 memfn_quals != TYPE_UNQUALIFIED,
8836 inlinep, friendp, raises != NULL_TREE);
8841 /* Detect the case of an array type of unspecified size
8842 which came, as such, direct from a typedef name.
8843 We must copy the type, so that the array's domain can be
8844 individually set by the object's initializer. */
8846 if (type && typedef_type
8847 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8848 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8849 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8851 /* Detect where we're using a typedef of function type to declare a
8852 function. PARMS will not be set, so we must create it now. */
8854 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8856 tree decls = NULL_TREE;
8859 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8861 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8863 TREE_CHAIN (decl) = decls;
8867 parms = nreverse (decls);
8869 if (decl_context != TYPENAME)
8871 /* A cv-qualifier-seq shall only be part of the function type
8872 for a non-static member function. [8.3.5/4 dcl.fct] */
8873 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8874 && (current_class_type == NULL_TREE || staticp) )
8877 ? G_("qualified function types cannot be used to "
8878 "declare static member functions")
8879 : G_("qualified function types cannot be used to "
8880 "declare free functions"));
8881 type = TYPE_MAIN_VARIANT (type);
8884 /* The qualifiers on the function type become the qualifiers on
8885 the non-static member function. */
8886 memfn_quals |= cp_type_quals (type);
8890 /* If this is a type name (such as, in a cast or sizeof),
8891 compute the type and return it now. */
8893 if (decl_context == TYPENAME)
8895 /* Note that the grammar rejects storage classes
8896 in typenames, fields or parameters. */
8897 if (type_quals != TYPE_UNQUALIFIED)
8898 type_quals = TYPE_UNQUALIFIED;
8900 /* Special case: "friend class foo" looks like a TYPENAME context. */
8903 if (type_quals != TYPE_UNQUALIFIED)
8905 error ("type qualifiers specified for friend class declaration");
8906 type_quals = TYPE_UNQUALIFIED;
8910 error ("%<inline%> specified for friend class declaration");
8916 /* Don't allow friend declaration without a class-key. */
8917 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8918 permerror (input_location, "template parameters cannot be friends");
8919 else if (TREE_CODE (type) == TYPENAME_TYPE)
8920 permerror (input_location, "friend declaration requires class-key, "
8921 "i.e. %<friend class %T::%D%>",
8922 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8924 permerror (input_location, "friend declaration requires class-key, "
8925 "i.e. %<friend %#T%>",
8929 /* Only try to do this stuff if we didn't already give up. */
8930 if (type != integer_type_node)
8932 /* A friendly class? */
8933 if (current_class_type)
8934 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8937 error ("trying to make class %qT a friend of global scope",
8940 type = void_type_node;
8943 else if (memfn_quals)
8945 if (ctype == NULL_TREE)
8947 if (TREE_CODE (type) != METHOD_TYPE)
8948 error ("invalid qualifiers on non-member function type");
8950 ctype = TYPE_METHOD_BASETYPE (type);
8953 type = build_memfn_type (type, ctype, memfn_quals);
8958 else if (unqualified_id == NULL_TREE && decl_context != PARM
8959 && decl_context != CATCHPARM
8960 && TREE_CODE (type) != UNION_TYPE
8963 error ("abstract declarator %qT used as declaration", type);
8964 return error_mark_node;
8967 /* Only functions may be declared using an operator-function-id. */
8969 && IDENTIFIER_OPNAME_P (unqualified_id)
8970 && TREE_CODE (type) != FUNCTION_TYPE
8971 && TREE_CODE (type) != METHOD_TYPE)
8973 error ("declaration of %qD as non-function", unqualified_id);
8974 return error_mark_node;
8977 /* We don't check parameter types here because we can emit a better
8978 error message later. */
8979 if (decl_context != PARM)
8981 type = check_var_type (unqualified_id, type);
8982 if (type == error_mark_node)
8983 return error_mark_node;
8986 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8987 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8989 if (decl_context == PARM || decl_context == CATCHPARM)
8991 if (ctype || in_namespace)
8992 error ("cannot use %<::%> in parameter declaration");
8994 /* A parameter declared as an array of T is really a pointer to T.
8995 One declared as a function is really a pointer to a function.
8996 One declared as a member is really a pointer to member. */
8998 if (TREE_CODE (type) == ARRAY_TYPE)
9000 /* Transfer const-ness of array into that of type pointed to. */
9001 type = build_pointer_type (TREE_TYPE (type));
9002 type_quals = TYPE_UNQUALIFIED;
9004 else if (TREE_CODE (type) == FUNCTION_TYPE)
9005 type = build_pointer_type (type);
9011 if (decl_context == PARM)
9013 decl = cp_build_parm_decl (unqualified_id, type);
9015 bad_specifiers (decl, "parameter", virtualp,
9016 memfn_quals != TYPE_UNQUALIFIED,
9017 inlinep, friendp, raises != NULL_TREE);
9019 else if (decl_context == FIELD)
9021 /* The C99 flexible array extension. */
9022 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9023 && TYPE_DOMAIN (type) == NULL_TREE)
9025 tree itype = compute_array_index_type (dname, integer_zero_node);
9026 type = build_cplus_array_type (TREE_TYPE (type), itype);
9029 if (type == error_mark_node)
9031 /* Happens when declaring arrays of sizes which
9032 are error_mark_node, for example. */
9035 else if (in_namespace && !friendp)
9037 /* Something like struct S { int N::j; }; */
9038 error ("invalid use of %<::%>");
9039 return error_mark_node;
9041 else if (TREE_CODE (type) == FUNCTION_TYPE)
9044 tree function_context;
9048 if (ctype == NULL_TREE)
9049 ctype = current_class_type;
9051 if (ctype == NULL_TREE)
9053 error ("can't make %qD into a method -- not in a class",
9055 return error_mark_node;
9058 /* ``A union may [ ... ] not [ have ] virtual functions.''
9060 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9062 error ("function %qD declared virtual inside a union",
9064 return error_mark_node;
9067 if (NEW_DELETE_OPNAME_P (unqualified_id))
9071 error ("%qD cannot be declared virtual, since it "
9077 else if (staticp < 2)
9078 type = build_memfn_type (type, ctype, memfn_quals);
9081 /* Check that the name used for a destructor makes sense. */
9082 if (sfk == sfk_destructor)
9084 tree uqname = id_declarator->u.id.unqualified_name;
9088 gcc_assert (friendp);
9089 error ("expected qualified name in friend declaration "
9090 "for destructor %qD", uqname);
9091 return error_mark_node;
9094 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9096 error ("declaration of %qD as member of %qT",
9098 return error_mark_node;
9101 else if (sfk == sfk_constructor && friendp)
9103 error ("expected qualified name in friend declaration "
9104 "for constructor %qD",
9105 id_declarator->u.id.unqualified_name);
9106 return error_mark_node;
9109 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9110 function_context = (ctype != NULL_TREE) ?
9111 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9112 publicp = (! friendp || ! staticp)
9113 && function_context == NULL_TREE;
9114 decl = grokfndecl (ctype, type,
9115 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9116 ? unqualified_id : dname,
9119 virtualp, flags, memfn_quals, raises,
9120 friendp ? -1 : 0, friendp, publicp, inlinep,
9122 funcdef_flag, template_count, in_namespace,
9123 attrlist, declarator->id_loc);
9124 if (decl == NULL_TREE)
9125 return error_mark_node;
9127 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9128 /* The decl and setting of decl_attr is also turned off. */
9129 decl = build_decl_attribute_variant (decl, decl_attr);
9132 /* [class.conv.ctor]
9134 A constructor declared without the function-specifier
9135 explicit that can be called with a single parameter
9136 specifies a conversion from the type of its first
9137 parameter to the type of its class. Such a constructor
9138 is called a converting constructor. */
9140 DECL_NONCONVERTING_P (decl) = 1;
9142 else if (TREE_CODE (type) == METHOD_TYPE)
9144 /* We only get here for friend declarations of
9145 members of other classes. */
9146 /* All method decls are public, so tell grokfndecl to set
9147 TREE_PUBLIC, also. */
9148 decl = grokfndecl (ctype, type,
9149 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9150 ? unqualified_id : dname,
9153 virtualp, flags, memfn_quals, raises,
9154 friendp ? -1 : 0, friendp, 1, 0, sfk,
9155 funcdef_flag, template_count, in_namespace,
9157 declarator->id_loc);
9158 if (decl == NULL_TREE)
9159 return error_mark_node;
9161 else if (!staticp && !dependent_type_p (type)
9162 && !COMPLETE_TYPE_P (complete_type (type))
9163 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9166 error ("field %qD has incomplete type", unqualified_id);
9168 error ("name %qT has incomplete type", type);
9170 /* If we're instantiating a template, tell them which
9171 instantiation made the field's type be incomplete. */
9172 if (current_class_type
9173 && TYPE_NAME (current_class_type)
9174 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9176 && declspecs->type == type)
9177 error (" in instantiation of template %qT",
9178 current_class_type);
9180 return error_mark_node;
9186 error ("%qE is neither function nor member function; "
9187 "cannot be declared friend", unqualified_id);
9195 /* Friends are treated specially. */
9196 if (ctype == current_class_type)
9197 ; /* We already issued a permerror. */
9198 else if (decl && DECL_NAME (decl))
9200 if (template_class_depth (current_class_type) == 0)
9202 decl = check_explicit_specialization
9203 (unqualified_id, decl, template_count,
9204 2 * funcdef_flag + 4);
9205 if (decl == error_mark_node)
9206 return error_mark_node;
9209 decl = do_friend (ctype, unqualified_id, decl,
9215 return error_mark_node;
9218 /* Structure field. It may not be a function, except for C++. */
9220 if (decl == NULL_TREE)
9226 /* An attempt is being made to initialize a non-static
9227 member. But, from [class.mem]:
9229 4 A member-declarator can contain a
9230 constant-initializer only if it declares a static
9231 member (_class.static_) of integral or enumeration
9232 type, see _class.static.data_.
9234 This used to be relatively common practice, but
9235 the rest of the compiler does not correctly
9236 handle the initialization unless the member is
9237 static so we make it static below. */
9238 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9240 permerror (input_location, "making %qD static", unqualified_id);
9244 if (uses_template_parms (type))
9245 /* We'll check at instantiation time. */
9247 else if (check_static_variable_definition (unqualified_id,
9249 /* If we just return the declaration, crashes
9250 will sometimes occur. We therefore return
9251 void_type_node, as if this was a friend
9252 declaration, to cause callers to completely
9253 ignore this declaration. */
9254 return error_mark_node;
9259 /* C++ allows static class members. All other work
9260 for this is done by grokfield. */
9261 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9262 set_linkage_for_static_data_member (decl);
9263 /* Even if there is an in-class initialization, DECL
9264 is considered undefined until an out-of-class
9265 definition is provided. */
9266 DECL_EXTERNAL (decl) = 1;
9269 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9273 decl = build_decl (FIELD_DECL, unqualified_id, type);
9274 DECL_NONADDRESSABLE_P (decl) = bitfield;
9275 if (bitfield && !unqualified_id)
9276 TREE_NO_WARNING (decl) = 1;
9278 if (storage_class == sc_mutable)
9280 DECL_MUTABLE_P (decl) = 1;
9281 storage_class = sc_none;
9285 bad_specifiers (decl, "field", virtualp,
9286 memfn_quals != TYPE_UNQUALIFIED,
9287 inlinep, friendp, raises != NULL_TREE);
9290 else if (TREE_CODE (type) == FUNCTION_TYPE
9291 || TREE_CODE (type) == METHOD_TYPE)
9296 if (!unqualified_id)
9297 return error_mark_node;
9299 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9300 original_name = dname;
9302 original_name = unqualified_id;
9304 if (storage_class == sc_auto)
9305 error ("storage class %<auto%> invalid for function %qs", name);
9306 else if (storage_class == sc_register)
9307 error ("storage class %<register%> invalid for function %qs", name);
9309 error ("storage class %<__thread%> invalid for function %qs", name);
9311 /* Function declaration not at top level.
9312 Storage classes other than `extern' are not allowed
9313 and `extern' makes no difference. */
9314 if (! toplevel_bindings_p ()
9315 && (storage_class == sc_static
9316 || declspecs->specs[(int)ds_inline])
9319 if (storage_class == sc_static)
9320 pedwarn (input_location, OPT_pedantic,
9321 "%<static%> specified invalid for function %qs "
9322 "declared out of global scope", name);
9324 pedwarn (input_location, OPT_pedantic,
9325 "%<inline%> specifier invalid for function %qs "
9326 "declared out of global scope", name);
9329 if (ctype != NULL_TREE
9330 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9332 error ("%q#T is not a class or a namespace", ctype);
9336 if (ctype == NULL_TREE)
9340 error ("virtual non-class function %qs", name);
9344 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9345 && !NEW_DELETE_OPNAME_P (original_name))
9346 type = build_method_type_directly (ctype,
9348 TYPE_ARG_TYPES (type));
9350 /* Record presence of `static'. */
9351 publicp = (ctype != NULL_TREE
9352 || storage_class == sc_extern
9353 || storage_class != sc_static);
9355 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9356 virtualp, flags, memfn_quals, raises,
9358 publicp, inlinep, sfk, funcdef_flag,
9359 template_count, in_namespace, attrlist,
9360 declarator->id_loc);
9361 if (decl == NULL_TREE)
9362 return error_mark_node;
9366 int invalid_static = 0;
9368 /* Don't allow a static member function in a class, and forbid
9369 declaring main to be static. */
9370 if (TREE_CODE (type) == METHOD_TYPE)
9372 permerror (input_location, "cannot declare member function %qD to have "
9373 "static linkage", decl);
9376 else if (current_function_decl)
9378 /* FIXME need arm citation */
9379 error ("cannot declare static function inside another function");
9386 storage_class = sc_none;
9392 /* It's a variable. */
9394 /* An uninitialized decl with `extern' is a reference. */
9395 decl = grokvardecl (type, unqualified_id,
9398 (type_quals & TYPE_QUAL_CONST) != 0,
9399 ctype ? ctype : in_namespace);
9400 bad_specifiers (decl, "variable", virtualp,
9401 memfn_quals != TYPE_UNQUALIFIED,
9402 inlinep, friendp, raises != NULL_TREE);
9406 DECL_CONTEXT (decl) = ctype;
9409 permerror (input_location, "%<static%> may not be used when defining "
9410 "(as opposed to declaring) a static data member");
9412 storage_class = sc_none;
9414 if (storage_class == sc_register && TREE_STATIC (decl))
9416 error ("static member %qD declared %<register%>", decl);
9417 storage_class = sc_none;
9419 if (storage_class == sc_extern && pedantic)
9421 pedwarn (input_location, OPT_pedantic,
9422 "cannot explicitly declare member %q#D to have "
9423 "extern linkage", decl);
9424 storage_class = sc_none;
9429 if (storage_class == sc_extern && initialized && !funcdef_flag)
9431 if (toplevel_bindings_p ())
9433 /* It's common practice (and completely valid) to have a const
9434 be initialized and declared extern. */
9435 if (!(type_quals & TYPE_QUAL_CONST))
9436 warning (0, "%qs initialized and declared %<extern%>", name);
9440 error ("%qs has both %<extern%> and initializer", name);
9441 return error_mark_node;
9445 /* Record `register' declaration for warnings on &
9446 and in case doing stupid register allocation. */
9448 if (storage_class == sc_register)
9449 DECL_REGISTER (decl) = 1;
9450 else if (storage_class == sc_extern)
9451 DECL_THIS_EXTERN (decl) = 1;
9452 else if (storage_class == sc_static)
9453 DECL_THIS_STATIC (decl) = 1;
9455 /* Record constancy and volatility on the DECL itself . There's
9456 no need to do this when processing a template; we'll do this
9457 for the instantiated declaration based on the type of DECL. */
9458 if (!processing_template_decl)
9459 cp_apply_type_quals_to_decl (type_quals, decl);
9462 TREE_NO_WARNING (decl) = 1;
9468 /* Subroutine of start_function. Ensure that each of the parameter
9469 types (as listed in PARMS) is complete, as is required for a
9470 function definition. */
9473 require_complete_types_for_parms (tree parms)
9475 for (; parms; parms = TREE_CHAIN (parms))
9477 if (dependent_type_p (TREE_TYPE (parms)))
9479 if (!VOID_TYPE_P (TREE_TYPE (parms))
9480 && complete_type_or_else (TREE_TYPE (parms), parms))
9482 relayout_decl (parms);
9483 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9486 /* grokparms or complete_type_or_else will have already issued
9488 TREE_TYPE (parms) = error_mark_node;
9492 /* Returns nonzero if T is a local variable. */
9495 local_variable_p (const_tree t)
9497 if ((TREE_CODE (t) == VAR_DECL
9498 /* A VAR_DECL with a context that is a _TYPE is a static data
9500 && !TYPE_P (CP_DECL_CONTEXT (t))
9501 /* Any other non-local variable must be at namespace scope. */
9502 && !DECL_NAMESPACE_SCOPE_P (t))
9503 || (TREE_CODE (t) == PARM_DECL))
9509 /* Like local_variable_p, but suitable for use as a tree-walking
9513 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9514 void *data ATTRIBUTE_UNUSED)
9516 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9518 else if (TYPE_P (*tp))
9525 /* Check that ARG, which is a default-argument expression for a
9526 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9527 something goes wrong. DECL may also be a _TYPE node, rather than a
9528 DECL, if there is no DECL available. */
9531 check_default_argument (tree decl, tree arg)
9536 if (TREE_CODE (arg) == DEFAULT_ARG)
9537 /* We get a DEFAULT_ARG when looking at an in-class declaration
9538 with a default argument. Ignore the argument for now; we'll
9539 deal with it after the class is complete. */
9548 decl_type = TREE_TYPE (decl);
9550 if (arg == error_mark_node
9551 || decl == error_mark_node
9552 || TREE_TYPE (arg) == error_mark_node
9553 || decl_type == error_mark_node)
9554 /* Something already went wrong. There's no need to check
9556 return error_mark_node;
9558 /* [dcl.fct.default]
9560 A default argument expression is implicitly converted to the
9562 if (!TREE_TYPE (arg)
9563 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9566 error ("default argument for %q#D has type %qT",
9567 decl, TREE_TYPE (arg));
9569 error ("default argument for parameter of type %qT has type %qT",
9570 decl_type, TREE_TYPE (arg));
9572 return error_mark_node;
9575 /* [dcl.fct.default]
9577 Local variables shall not be used in default argument
9580 The keyword `this' shall not be used in a default argument of a
9582 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9585 error ("default argument %qE uses local variable %qD", arg, var);
9586 return error_mark_node;
9593 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9596 type_is_deprecated (tree type)
9598 enum tree_code code;
9599 if (TREE_DEPRECATED (type))
9601 if (TYPE_NAME (type)
9602 && TREE_DEPRECATED (TYPE_NAME (type)))
9605 code = TREE_CODE (type);
9607 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9608 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9609 || code == METHOD_TYPE || code == ARRAY_TYPE)
9610 return type_is_deprecated (TREE_TYPE (type));
9612 if (TYPE_PTRMEMFUNC_P (type))
9613 return type_is_deprecated
9614 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9619 /* Decode the list of parameter types for a function type.
9620 Given the list of things declared inside the parens,
9621 return a list of types.
9623 If this parameter does not end with an ellipsis, we append
9626 *PARMS is set to the chain of PARM_DECLs created. */
9629 grokparms (tree parmlist, tree *parms)
9631 tree result = NULL_TREE;
9632 tree decls = NULL_TREE;
9636 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9638 tree type = NULL_TREE;
9639 tree init = TREE_PURPOSE (parm);
9640 tree decl = TREE_VALUE (parm);
9642 if (parm == void_list_node)
9645 if (! decl || TREE_TYPE (decl) == error_mark_node)
9648 type = TREE_TYPE (decl);
9649 if (VOID_TYPE_P (type))
9651 if (same_type_p (type, void_type_node)
9652 && DECL_SELF_REFERENCE_P (type)
9653 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9654 /* this is a parmlist of `(void)', which is ok. */
9656 cxx_incomplete_type_error (decl, type);
9657 /* It's not a good idea to actually create parameters of
9658 type `void'; other parts of the compiler assume that a
9659 void type terminates the parameter list. */
9660 type = error_mark_node;
9661 TREE_TYPE (decl) = error_mark_node;
9664 if (type != error_mark_node
9665 && TYPE_FOR_JAVA (type)
9666 && MAYBE_CLASS_TYPE_P (type))
9668 error ("parameter %qD has Java class type", decl);
9669 type = error_mark_node;
9670 TREE_TYPE (decl) = error_mark_node;
9674 if (type != error_mark_node)
9676 if (deprecated_state != DEPRECATED_SUPPRESS)
9678 tree deptype = type_is_deprecated (type);
9680 warn_deprecated_use (deptype);
9683 /* Top-level qualifiers on the parameters are
9684 ignored for function types. */
9685 type = cp_build_qualified_type (type, 0);
9686 if (TREE_CODE (type) == METHOD_TYPE)
9688 error ("parameter %qD invalidly declared method type", decl);
9689 type = build_pointer_type (type);
9690 TREE_TYPE (decl) = type;
9692 else if (abstract_virtuals_error (decl, type))
9693 any_error = 1; /* Seems like a good idea. */
9694 else if (POINTER_TYPE_P (type))
9696 /* [dcl.fct]/6, parameter types cannot contain pointers
9697 (references) to arrays of unknown bound. */
9698 tree t = TREE_TYPE (type);
9699 int ptr = TYPE_PTR_P (type);
9705 else if (TREE_CODE (t) != ARRAY_TYPE)
9707 else if (!TYPE_DOMAIN (t))
9711 if (TREE_CODE (t) == ARRAY_TYPE)
9712 error ("parameter %qD includes %s to array of unknown "
9714 decl, ptr ? "pointer" : "reference", t);
9719 else if (init && !processing_template_decl)
9720 init = check_default_argument (decl, init);
9723 if (TREE_CODE (decl) == PARM_DECL
9724 && FUNCTION_PARAMETER_PACK_P (decl)
9725 && TREE_CHAIN (parm)
9726 && TREE_CHAIN (parm) != void_list_node)
9727 error ("parameter packs must be at the end of the parameter list");
9729 TREE_CHAIN (decl) = decls;
9731 result = tree_cons (init, type, result);
9733 decls = nreverse (decls);
9734 result = nreverse (result);
9736 result = chainon (result, void_list_node);
9743 /* D is a constructor or overloaded `operator='.
9745 Let T be the class in which D is declared. Then, this function
9748 -1 if D's is an ill-formed constructor or copy assignment operator
9749 whose first parameter is of type `T'.
9750 0 if D is not a copy constructor or copy assignment
9752 1 if D is a copy constructor or copy assignment operator whose
9753 first parameter is a reference to const qualified T.
9754 2 if D is a copy constructor or copy assignment operator whose
9755 first parameter is a reference to non-const qualified T.
9757 This function can be used as a predicate. Positive values indicate
9758 a copy constructor and nonzero values indicate a copy assignment
9762 copy_fn_p (const_tree d)
9768 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9770 if (TREE_CODE (d) == TEMPLATE_DECL
9771 || (DECL_TEMPLATE_INFO (d)
9772 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9773 /* Instantiations of template member functions are never copy
9774 functions. Note that member functions of templated classes are
9775 represented as template functions internally, and we must
9776 accept those as copy functions. */
9779 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9783 arg_type = TREE_VALUE (args);
9784 if (arg_type == error_mark_node)
9787 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9789 /* Pass by value copy assignment operator. */
9792 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9793 && !TYPE_REF_IS_RVALUE (arg_type)
9794 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9796 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9802 args = TREE_CHAIN (args);
9804 if (args && args != void_list_node && !TREE_PURPOSE (args))
9805 /* There are more non-optional args. */
9811 /* D is a constructor or overloaded `operator='.
9813 Let T be the class in which D is declared. Then, this function
9814 returns true when D is a move constructor or move assignment
9815 operator, false otherwise. */
9818 move_fn_p (const_tree d)
9822 bool result = false;
9824 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9826 if (cxx_dialect == cxx98)
9827 /* There are no move constructors if we are in C++98 mode. */
9830 if (TREE_CODE (d) == TEMPLATE_DECL
9831 || (DECL_TEMPLATE_INFO (d)
9832 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9833 /* Instantiations of template member functions are never copy
9834 functions. Note that member functions of templated classes are
9835 represented as template functions internally, and we must
9836 accept those as copy functions. */
9839 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9843 arg_type = TREE_VALUE (args);
9844 if (arg_type == error_mark_node)
9847 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9848 && TYPE_REF_IS_RVALUE (arg_type)
9849 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9853 args = TREE_CHAIN (args);
9855 if (args && args != void_list_node && !TREE_PURPOSE (args))
9856 /* There are more non-optional args. */
9862 /* Remember any special properties of member function DECL. */
9865 grok_special_member_properties (tree decl)
9869 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9872 class_type = DECL_CONTEXT (decl);
9873 if (DECL_CONSTRUCTOR_P (decl))
9875 int ctor = copy_fn_p (decl);
9877 if (!DECL_ARTIFICIAL (decl))
9878 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9884 A non-template constructor for class X is a copy
9885 constructor if its first parameter is of type X&, const
9886 X&, volatile X& or const volatile X&, and either there
9887 are no other parameters or else all other parameters have
9888 default arguments. */
9889 TYPE_HAS_INIT_REF (class_type) = 1;
9890 if (!DECL_DEFAULTED_FN (decl))
9891 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9893 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9895 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9897 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9898 if (TREE_CODE (decl) == TEMPLATE_DECL || !DECL_DEFAULTED_FN (decl))
9899 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
9901 else if (is_list_ctor (decl))
9902 TYPE_HAS_LIST_CTOR (class_type) = 1;
9904 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9908 A non-template assignment operator for class X is a copy
9909 assignment operator if its parameter is of type X, X&, const
9910 X&, volatile X& or const volatile X&. */
9912 int assop = copy_fn_p (decl);
9916 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9917 if (!DECL_DEFAULTED_FN (decl))
9918 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9920 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9925 /* Check a constructor DECL has the correct form. Complains
9926 if the class has a constructor of the form X(X). */
9929 grok_ctor_properties (const_tree ctype, const_tree decl)
9931 int ctor_parm = copy_fn_p (decl);
9937 A declaration of a constructor for a class X is ill-formed if
9938 its first parameter is of type (optionally cv-qualified) X
9939 and either there are no other parameters or else all other
9940 parameters have default arguments.
9942 We *don't* complain about member template instantiations that
9943 have this form, though; they can occur as we try to decide
9944 what constructor to use during overload resolution. Since
9945 overload resolution will never prefer such a constructor to
9946 the non-template copy constructor (which is either explicitly
9947 or implicitly defined), there's no need to worry about their
9948 existence. Theoretically, they should never even be
9949 instantiated, but that's hard to forestall. */
9950 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9958 /* An operator with this code is unary, but can also be binary. */
9961 ambi_op_p (enum tree_code code)
9963 return (code == INDIRECT_REF
9964 || code == ADDR_EXPR
9965 || code == UNARY_PLUS_EXPR
9966 || code == NEGATE_EXPR
9967 || code == PREINCREMENT_EXPR
9968 || code == PREDECREMENT_EXPR);
9971 /* An operator with this name can only be unary. */
9974 unary_op_p (enum tree_code code)
9976 return (code == TRUTH_NOT_EXPR
9977 || code == BIT_NOT_EXPR
9978 || code == COMPONENT_REF
9979 || code == TYPE_EXPR);
9982 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9983 errors are issued for invalid declarations. */
9986 grok_op_properties (tree decl, bool complain)
9988 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9990 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9991 tree name = DECL_NAME (decl);
9992 enum tree_code operator_code;
9997 /* Count the number of arguments and check for ellipsis. */
9998 for (argtype = argtypes, arity = 0;
9999 argtype && argtype != void_list_node;
10000 argtype = TREE_CHAIN (argtype))
10002 ellipsis_p = !argtype;
10004 class_type = DECL_CONTEXT (decl);
10005 if (class_type && !CLASS_TYPE_P (class_type))
10006 class_type = NULL_TREE;
10008 if (DECL_CONV_FN_P (decl))
10009 operator_code = TYPE_EXPR;
10013 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10014 if (ansi_opname (CODE) == name) \
10016 operator_code = (CODE); \
10019 else if (ansi_assopname (CODE) == name) \
10021 operator_code = (CODE); \
10022 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10026 #include "operators.def"
10027 #undef DEF_OPERATOR
10029 gcc_unreachable ();
10032 gcc_assert (operator_code != MAX_TREE_CODES);
10033 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10036 switch (operator_code)
10039 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10043 TYPE_GETS_DELETE (class_type) |= 1;
10047 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10050 case VEC_DELETE_EXPR:
10051 TYPE_GETS_DELETE (class_type) |= 2;
10058 /* [basic.std.dynamic.allocation]/1:
10060 A program is ill-formed if an allocation function is declared
10061 in a namespace scope other than global scope or declared static
10064 The same also holds true for deallocation functions. */
10065 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10066 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10068 if (DECL_NAMESPACE_SCOPE_P (decl))
10070 if (CP_DECL_CONTEXT (decl) != global_namespace)
10072 error ("%qD may not be declared within a namespace", decl);
10075 else if (!TREE_PUBLIC (decl))
10077 error ("%qD may not be declared as static", decl);
10083 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10085 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10086 DECL_IS_OPERATOR_NEW (decl) = 1;
10088 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10089 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10092 /* An operator function must either be a non-static member function
10093 or have at least one parameter of a class, a reference to a class,
10094 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10095 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10097 if (operator_code == TYPE_EXPR
10098 || operator_code == CALL_EXPR
10099 || operator_code == COMPONENT_REF
10100 || operator_code == ARRAY_REF
10101 || operator_code == NOP_EXPR)
10103 error ("%qD must be a nonstatic member function", decl);
10110 if (DECL_STATIC_FUNCTION_P (decl))
10112 error ("%qD must be either a non-static member "
10113 "function or a non-member function", decl);
10117 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10119 tree arg = non_reference (TREE_VALUE (p));
10120 if (arg == error_mark_node)
10123 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10124 because these checks are performed even on
10125 template functions. */
10126 if (MAYBE_CLASS_TYPE_P (arg)
10127 || TREE_CODE (arg) == ENUMERAL_TYPE)
10131 if (!p || p == void_list_node)
10134 error ("%qD must have an argument of class or "
10135 "enumerated type", decl);
10141 /* There are no restrictions on the arguments to an overloaded
10143 if (operator_code == CALL_EXPR)
10146 /* Warn about conversion operators that will never be used. */
10147 if (IDENTIFIER_TYPENAME_P (name)
10148 && ! DECL_TEMPLATE_INFO (decl)
10150 /* Warn only declaring the function; there is no need to
10151 warn again about out-of-class definitions. */
10152 && class_type == current_class_type)
10154 tree t = TREE_TYPE (name);
10155 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10156 const char *what = 0;
10159 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10161 if (TREE_CODE (t) == VOID_TYPE)
10163 else if (class_type)
10165 if (t == class_type)
10166 what = "the same type";
10167 /* Don't force t to be complete here. */
10168 else if (MAYBE_CLASS_TYPE_P (t)
10169 && COMPLETE_TYPE_P (t)
10170 && DERIVED_FROM_P (t, class_type))
10171 what = "a base class";
10175 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10176 "conversion operator",
10177 ref ? "a reference to " : "", what);
10180 if (operator_code == COND_EXPR)
10183 error ("ISO C++ prohibits overloading operator ?:");
10186 else if (ellipsis_p)
10188 error ("%qD must not have variable number of arguments", decl);
10191 else if (ambi_op_p (operator_code))
10194 /* We pick the one-argument operator codes by default, so
10195 we don't have to change anything. */
10197 else if (arity == 2)
10199 /* If we thought this was a unary operator, we now know
10200 it to be a binary operator. */
10201 switch (operator_code)
10204 operator_code = MULT_EXPR;
10208 operator_code = BIT_AND_EXPR;
10211 case UNARY_PLUS_EXPR:
10212 operator_code = PLUS_EXPR;
10216 operator_code = MINUS_EXPR;
10219 case PREINCREMENT_EXPR:
10220 operator_code = POSTINCREMENT_EXPR;
10223 case PREDECREMENT_EXPR:
10224 operator_code = POSTDECREMENT_EXPR;
10228 gcc_unreachable ();
10231 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10233 if ((operator_code == POSTINCREMENT_EXPR
10234 || operator_code == POSTDECREMENT_EXPR)
10235 && ! processing_template_decl
10236 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10239 error ("postfix %qD must take %<int%> as its argument",
10242 error ("postfix %qD must take %<int%> as its second "
10250 error ("%qD must take either zero or one argument", decl);
10252 error ("%qD must take either one or two arguments", decl);
10256 /* More Effective C++ rule 6. */
10258 && (operator_code == POSTINCREMENT_EXPR
10259 || operator_code == POSTDECREMENT_EXPR
10260 || operator_code == PREINCREMENT_EXPR
10261 || operator_code == PREDECREMENT_EXPR))
10263 tree arg = TREE_VALUE (argtypes);
10264 tree ret = TREE_TYPE (TREE_TYPE (decl));
10265 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10266 arg = TREE_TYPE (arg);
10267 arg = TYPE_MAIN_VARIANT (arg);
10268 if (operator_code == PREINCREMENT_EXPR
10269 || operator_code == PREDECREMENT_EXPR)
10271 if (TREE_CODE (ret) != REFERENCE_TYPE
10272 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10274 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10275 build_reference_type (arg));
10279 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10280 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10284 else if (unary_op_p (operator_code))
10289 error ("%qD must take %<void%>", decl);
10291 error ("%qD must take exactly one argument", decl);
10295 else /* if (binary_op_p (operator_code)) */
10300 error ("%qD must take exactly one argument", decl);
10302 error ("%qD must take exactly two arguments", decl);
10306 /* More Effective C++ rule 7. */
10308 && (operator_code == TRUTH_ANDIF_EXPR
10309 || operator_code == TRUTH_ORIF_EXPR
10310 || operator_code == COMPOUND_EXPR))
10311 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10315 /* Effective C++ rule 23. */
10318 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10319 && (operator_code == PLUS_EXPR
10320 || operator_code == MINUS_EXPR
10321 || operator_code == TRUNC_DIV_EXPR
10322 || operator_code == MULT_EXPR
10323 || operator_code == TRUNC_MOD_EXPR)
10324 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10325 warning (OPT_Weffc__, "%qD should return by value", decl);
10327 /* [over.oper]/8 */
10328 for (; argtypes && argtypes != void_list_node;
10329 argtypes = TREE_CHAIN (argtypes))
10330 if (TREE_PURPOSE (argtypes))
10332 TREE_PURPOSE (argtypes) = NULL_TREE;
10333 if (operator_code == POSTINCREMENT_EXPR
10334 || operator_code == POSTDECREMENT_EXPR)
10336 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10341 error ("%qD cannot have default arguments", decl);
10349 /* Return a string giving the keyword associate with CODE. */
10351 static const char *
10352 tag_name (enum tag_types code)
10364 case typename_type:
10367 gcc_unreachable ();
10371 /* Name lookup in an elaborated-type-specifier (after the keyword
10372 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10373 elaborated-type-specifier is invalid, issue a diagnostic and return
10374 error_mark_node; otherwise, return the *_TYPE to which it referred.
10375 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10378 check_elaborated_type_specifier (enum tag_types tag_code,
10380 bool allow_template_p)
10386 struct S { struct S *p; };
10388 name lookup will find the TYPE_DECL for the implicit "S::S"
10389 typedef. Adjust for that here. */
10390 if (DECL_SELF_REFERENCE_P (decl))
10391 decl = TYPE_NAME (TREE_TYPE (decl));
10393 type = TREE_TYPE (decl);
10395 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10396 is false for this case as well. */
10397 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10399 error ("using template type parameter %qT after %qs",
10400 type, tag_name (tag_code));
10401 return error_mark_node;
10405 If the identifier resolves to a typedef-name or a template
10406 type-parameter, the elaborated-type-specifier is ill-formed.
10408 In other words, the only legitimate declaration to use in the
10409 elaborated type specifier is the implicit typedef created when
10410 the type is declared. */
10411 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10412 && tag_code != typename_type)
10414 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10415 error ("%q+D has a previous declaration here", decl);
10416 return error_mark_node;
10418 else if (TREE_CODE (type) != RECORD_TYPE
10419 && TREE_CODE (type) != UNION_TYPE
10420 && tag_code != enum_type
10421 && tag_code != typename_type)
10423 error ("%qT referred to as %qs", type, tag_name (tag_code));
10424 error ("%q+T has a previous declaration here", type);
10425 return error_mark_node;
10427 else if (TREE_CODE (type) != ENUMERAL_TYPE
10428 && tag_code == enum_type)
10430 error ("%qT referred to as enum", type);
10431 error ("%q+T has a previous declaration here", type);
10432 return error_mark_node;
10434 else if (!allow_template_p
10435 && TREE_CODE (type) == RECORD_TYPE
10436 && CLASSTYPE_IS_TEMPLATE (type))
10438 /* If a class template appears as elaborated type specifier
10439 without a template header such as:
10441 template <class T> class C {};
10442 void f(class C); // No template header here
10444 then the required template argument is missing. */
10445 error ("template argument required for %<%s %T%>",
10446 tag_name (tag_code),
10447 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10448 return error_mark_node;
10454 /* Lookup NAME in elaborate type specifier in scope according to
10455 SCOPE and issue diagnostics if necessary.
10456 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10457 found, and ERROR_MARK_NODE for type error. */
10460 lookup_and_check_tag (enum tag_types tag_code, tree name,
10461 tag_scope scope, bool template_header_p)
10465 if (scope == ts_global)
10467 /* First try ordinary name lookup, ignoring hidden class name
10468 injected via friend declaration. */
10469 decl = lookup_name_prefer_type (name, 2);
10470 /* If that fails, the name will be placed in the smallest
10471 non-class, non-function-prototype scope according to 3.3.1/5.
10472 We may already have a hidden name declared as friend in this
10473 scope. So lookup again but not ignoring hidden names.
10474 If we find one, that name will be made visible rather than
10475 creating a new tag. */
10477 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10480 decl = lookup_type_scope (name, scope);
10482 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10483 decl = DECL_TEMPLATE_RESULT (decl);
10485 if (decl && TREE_CODE (decl) == TYPE_DECL)
10487 /* Look for invalid nested type:
10491 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10493 error ("%qD has the same name as the class in which it is "
10496 return error_mark_node;
10499 /* Two cases we need to consider when deciding if a class
10500 template is allowed as an elaborated type specifier:
10501 1. It is a self reference to its own class.
10502 2. It comes with a template header.
10506 template <class T> class C {
10507 class C *c1; // DECL_SELF_REFERENCE_P is true
10510 template <class U> class C; // template_header_p is true
10511 template <class T> class C<T>::D {
10512 class C *c2; // DECL_SELF_REFERENCE_P is true
10515 t = check_elaborated_type_specifier (tag_code,
10518 | DECL_SELF_REFERENCE_P (decl));
10521 else if (decl && TREE_CODE (decl) == TREE_LIST)
10523 error ("reference to %qD is ambiguous", name);
10524 print_candidates (decl);
10525 return error_mark_node;
10531 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10532 Define the tag as a forward-reference if it is not defined.
10534 If a declaration is given, process it here, and report an error if
10535 multiple declarations are not identical.
10537 SCOPE is TS_CURRENT when this is also a definition. Only look in
10538 the current frame for the name (since C++ allows new names in any
10539 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10540 declaration. Only look beginning from the current scope outward up
10541 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10543 TEMPLATE_HEADER_P is true when this declaration is preceded by
10544 a set of template parameters. */
10547 xref_tag (enum tag_types tag_code, tree name,
10548 tag_scope scope, bool template_header_p)
10550 enum tree_code code;
10552 tree context = NULL_TREE;
10554 timevar_push (TV_NAME_LOOKUP);
10556 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10562 code = RECORD_TYPE;
10568 code = ENUMERAL_TYPE;
10571 gcc_unreachable ();
10574 /* In case of anonymous name, xref_tag is only called to
10575 make type node and push name. Name lookup is not required. */
10576 if (ANON_AGGRNAME_P (name))
10579 t = lookup_and_check_tag (tag_code, name,
10580 scope, template_header_p);
10582 if (t == error_mark_node)
10583 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10585 if (scope != ts_current && t && current_class_type
10586 && template_class_depth (current_class_type)
10587 && template_header_p)
10589 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10590 definition of this tag. Since, in addition, we are currently
10591 processing a (member) template declaration of a template
10592 class, we must be very careful; consider:
10599 { template <class V>
10600 friend struct S1; };
10602 Here, the S2::S1 declaration should not be confused with the
10603 outer declaration. In particular, the inner version should
10604 have a template parameter of level 2, not level 1. This
10605 would be particularly important if the member declaration
10608 template <class V = U> friend struct S1;
10610 say, when we should tsubst into `U' when instantiating
10611 S2. On the other hand, when presented with:
10621 we must find the inner binding eventually. We
10622 accomplish this by making sure that the new type we
10623 create to represent this declaration has the right
10625 context = TYPE_CONTEXT (t);
10631 /* If no such tag is yet defined, create a forward-reference node
10632 and record it as the "definition".
10633 When a real declaration of this type is found,
10634 the forward-reference will be altered into a real type. */
10635 if (code == ENUMERAL_TYPE)
10637 error ("use of enum %q#D without previous declaration", name);
10638 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10642 t = make_class_type (code);
10643 TYPE_CONTEXT (t) = context;
10644 t = pushtag (name, t, scope);
10649 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10651 if (!redeclare_class_template (t, current_template_parms))
10652 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10654 else if (!processing_template_decl
10655 && CLASS_TYPE_P (t)
10656 && CLASSTYPE_IS_TEMPLATE (t))
10658 error ("redeclaration of %qT as a non-template", t);
10659 error ("previous declaration %q+D", t);
10660 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10663 /* Make injected friend class visible. */
10664 if (scope != ts_within_enclosing_non_class
10665 && hidden_name_p (TYPE_NAME (t)))
10667 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10668 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10670 if (TYPE_TEMPLATE_INFO (t))
10672 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10673 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10678 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10682 xref_tag_from_type (tree old, tree id, tag_scope scope)
10684 enum tag_types tag_kind;
10686 if (TREE_CODE (old) == RECORD_TYPE)
10687 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10689 tag_kind = union_type;
10691 if (id == NULL_TREE)
10692 id = TYPE_IDENTIFIER (old);
10694 return xref_tag (tag_kind, id, scope, false);
10697 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10698 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10699 access_* node, and the TREE_VALUE is the type of the base-class.
10700 Non-NULL TREE_TYPE indicates virtual inheritance.
10702 Returns true if the binfo hierarchy was successfully created,
10703 false if an error was detected. */
10706 xref_basetypes (tree ref, tree base_list)
10709 tree binfo, base_binfo;
10710 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10711 unsigned max_bases = 0; /* Maximum direct bases. */
10713 tree default_access;
10714 tree igo_prev; /* Track Inheritance Graph Order. */
10716 if (ref == error_mark_node)
10719 /* The base of a derived class is private by default, all others are
10721 default_access = (TREE_CODE (ref) == RECORD_TYPE
10722 && CLASSTYPE_DECLARED_CLASS (ref)
10723 ? access_private_node : access_public_node);
10725 /* First, make sure that any templates in base-classes are
10726 instantiated. This ensures that if we call ourselves recursively
10727 we do not get confused about which classes are marked and which
10729 basep = &base_list;
10732 tree basetype = TREE_VALUE (*basep);
10734 if (!(processing_template_decl && uses_template_parms (basetype))
10735 && !complete_type_or_else (basetype, NULL))
10736 /* An incomplete type. Remove it from the list. */
10737 *basep = TREE_CHAIN (*basep);
10741 if (TREE_TYPE (*basep))
10743 if (CLASS_TYPE_P (basetype))
10744 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10745 basep = &TREE_CHAIN (*basep);
10749 TYPE_MARKED_P (ref) = 1;
10751 /* The binfo slot should be empty, unless this is an (ill-formed)
10753 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10754 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10756 binfo = make_tree_binfo (max_bases);
10758 TYPE_BINFO (ref) = binfo;
10759 BINFO_OFFSET (binfo) = size_zero_node;
10760 BINFO_TYPE (binfo) = ref;
10764 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10765 /* An aggregate cannot have baseclasses. */
10766 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10768 if (TREE_CODE (ref) == UNION_TYPE)
10770 error ("derived union %qT invalid", ref);
10777 if (TYPE_FOR_JAVA (ref))
10779 error ("Java class %qT cannot have multiple bases", ref);
10786 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10788 if (TYPE_FOR_JAVA (ref))
10790 error ("Java class %qT cannot have virtual bases", ref);
10795 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10797 tree access = TREE_PURPOSE (base_list);
10798 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10799 tree basetype = TREE_VALUE (base_list);
10801 if (access == access_default_node)
10802 access = default_access;
10804 if (PACK_EXPANSION_P (basetype))
10805 basetype = PACK_EXPANSION_PATTERN (basetype);
10806 if (TREE_CODE (basetype) == TYPE_DECL)
10807 basetype = TREE_TYPE (basetype);
10808 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10810 error ("base type %qT fails to be a struct or class type",
10815 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10816 TYPE_FOR_JAVA (ref) = 1;
10818 base_binfo = NULL_TREE;
10819 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10821 base_binfo = TYPE_BINFO (basetype);
10822 /* The original basetype could have been a typedef'd type. */
10823 basetype = BINFO_TYPE (base_binfo);
10825 /* Inherit flags from the base. */
10826 TYPE_HAS_NEW_OPERATOR (ref)
10827 |= TYPE_HAS_NEW_OPERATOR (basetype);
10828 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10829 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10830 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10831 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10832 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10833 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10834 CLASSTYPE_REPEATED_BASE_P (ref)
10835 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10838 /* We must do this test after we've seen through a typedef
10840 if (TYPE_MARKED_P (basetype))
10842 if (basetype == ref)
10843 error ("recursive type %qT undefined", basetype);
10845 error ("duplicate base type %qT invalid", basetype);
10849 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10850 /* Regenerate the pack expansion for the bases. */
10851 basetype = make_pack_expansion (basetype);
10853 TYPE_MARKED_P (basetype) = 1;
10855 base_binfo = copy_binfo (base_binfo, basetype, ref,
10856 &igo_prev, via_virtual);
10857 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10858 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10860 BINFO_BASE_APPEND (binfo, base_binfo);
10861 BINFO_BASE_ACCESS_APPEND (binfo, access);
10864 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10865 /* If we have space in the vbase vector, we must have shared at
10866 least one of them, and are therefore diamond shaped. */
10867 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10869 /* Unmark all the types. */
10870 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10871 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10872 TYPE_MARKED_P (ref) = 0;
10874 /* Now see if we have a repeated base type. */
10875 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10877 for (base_binfo = binfo; base_binfo;
10878 base_binfo = TREE_CHAIN (base_binfo))
10880 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10882 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10885 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10887 for (base_binfo = binfo; base_binfo;
10888 base_binfo = TREE_CHAIN (base_binfo))
10889 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10890 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10899 /* Begin compiling the definition of an enumeration type.
10902 UNDERLYING_TYPE is the type that will be used as the storage for
10903 the enumeration type. This should be NULL_TREE if no storage type
10906 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10908 Returns the type object, as yet incomplete.
10909 Also records info about it so that build_enumerator
10910 may be used to declare the individual values as they are read. */
10913 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10917 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10919 /* If this is the real definition for a previous forward reference,
10920 fill in the contents in the same object that used to be the
10921 forward reference. */
10923 enumtype = lookup_and_check_tag (enum_type, name,
10924 /*tag_scope=*/ts_current,
10925 /*template_header_p=*/false);
10927 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10929 error ("multiple definition of %q#T", enumtype);
10930 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10931 /* Clear out TYPE_VALUES, and start again. */
10932 TYPE_VALUES (enumtype) = NULL_TREE;
10936 /* In case of error, make a dummy enum to allow parsing to
10938 if (enumtype == error_mark_node)
10939 name = make_anon_name ();
10941 enumtype = make_node (ENUMERAL_TYPE);
10942 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10945 if (enumtype == error_mark_node)
10950 SET_SCOPED_ENUM_P (enumtype, 1);
10951 begin_scope (sk_scoped_enum, enumtype);
10953 /* [C++0x dcl.enum]p5:
10955 If not explicitly specified, the underlying type of a scoped
10956 enumeration type is int. */
10957 if (!underlying_type)
10958 underlying_type = integer_type_node;
10961 if (underlying_type)
10963 if (CP_INTEGRAL_TYPE_P (underlying_type))
10965 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10966 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10967 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10968 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10969 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
10970 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10971 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10972 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10973 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10974 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10977 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10978 underlying_type, enumtype);
10984 /* After processing and defining all the values of an enumeration type,
10985 install their decls in the enumeration type and finish it off.
10986 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10989 finish_enum (tree enumtype)
10998 bool use_short_enum;
11002 integer_type_kind itk;
11003 tree underlying_type = NULL_TREE;
11004 bool fixed_underlying_type_p
11005 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11007 /* We built up the VALUES in reverse order. */
11008 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11010 /* For an enum defined in a template, just set the type of the values;
11011 all further processing is postponed until the template is
11012 instantiated. We need to set the type so that tsubst of a CONST_DECL
11014 if (processing_template_decl)
11016 for (values = TYPE_VALUES (enumtype);
11018 values = TREE_CHAIN (values))
11019 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11020 if (at_function_scope_p ())
11021 add_stmt (build_min (TAG_DEFN, enumtype));
11025 /* Determine the minimum and maximum values of the enumerators. */
11026 if (TYPE_VALUES (enumtype))
11028 minnode = maxnode = NULL_TREE;
11030 for (values = TYPE_VALUES (enumtype);
11032 values = TREE_CHAIN (values))
11034 decl = TREE_VALUE (values);
11036 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11037 each enumerator has the type of its enumeration. Prior to the
11038 closing brace, the type of each enumerator is the type of its
11039 initializing value. */
11040 TREE_TYPE (decl) = enumtype;
11042 /* Update the minimum and maximum values, if appropriate. */
11043 value = DECL_INITIAL (decl);
11044 if (value == error_mark_node)
11045 value = integer_zero_node;
11046 /* Figure out what the minimum and maximum values of the
11047 enumerators are. */
11049 minnode = maxnode = value;
11050 else if (tree_int_cst_lt (maxnode, value))
11052 else if (tree_int_cst_lt (value, minnode))
11059 If the enumerator-list is empty, the underlying type is as if
11060 the enumeration had a single enumerator with value 0. */
11061 minnode = maxnode = integer_zero_node;
11063 /* Compute the number of bits require to represent all values of the
11064 enumeration. We must do this before the type of MINNODE and
11065 MAXNODE are transformed, since tree_int_cst_min_precision relies
11066 on the TREE_TYPE of the value it is passed. */
11067 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11068 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11069 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11070 precision = MAX (lowprec, highprec);
11072 if (!fixed_underlying_type_p)
11074 /* Determine the underlying type of the enumeration.
11078 The underlying type of an enumeration is an integral type that
11079 can represent all the enumerator values defined in the
11080 enumeration. It is implementation-defined which integral type is
11081 used as the underlying type for an enumeration except that the
11082 underlying type shall not be larger than int unless the value of
11083 an enumerator cannot fit in an int or unsigned int.
11085 We use "int" or an "unsigned int" as the underlying type, even if
11086 a smaller integral type would work, unless the user has
11087 explicitly requested that we use the smallest possible type. The
11088 user can request that for all enumerations with a command line
11089 flag, or for just one enumeration with an attribute. */
11091 use_short_enum = flag_short_enums
11092 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11094 for (itk = (use_short_enum ? itk_char : itk_int);
11098 underlying_type = integer_types[itk];
11099 if (TYPE_PRECISION (underlying_type) >= precision
11100 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11103 if (itk == itk_none)
11107 IF no integral type can represent all the enumerator values, the
11108 enumeration is ill-formed. */
11109 error ("no integral type can represent all of the enumerator values "
11110 "for %qT", enumtype);
11111 precision = TYPE_PRECISION (long_long_integer_type_node);
11112 underlying_type = integer_types[itk_unsigned_long_long];
11117 The value of sizeof() applied to an enumeration type, an object
11118 of an enumeration type, or an enumerator, is the value of sizeof()
11119 applied to the underlying type. */
11120 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11121 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11122 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11123 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11124 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11125 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11127 /* Set the underlying type of the enumeration type to the
11128 computed enumeration type, restricted to the enumerator
11130 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
11131 set_min_and_max_values_for_integral_type
11132 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11135 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11137 /* Compute the minimum and maximum values for the type.
11141 For an enumeration where emin is the smallest enumerator and emax
11142 is the largest, the values of the enumeration are the values of the
11143 underlying type in the range bmin to bmax, where bmin and bmax are,
11144 respectively, the smallest and largest values of the smallest bit-
11145 field that can store emin and emax. */
11147 /* The middle-end currently assumes that types with TYPE_PRECISION
11148 narrower than their underlying type are suitably zero or sign
11149 extended to fill their mode. g++ doesn't make these guarantees.
11150 Until the middle-end can represent such paradoxical types, we
11151 set the TYPE_PRECISION to the width of the underlying type. */
11152 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11154 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11156 /* Convert each of the enumerators to the type of the underlying
11157 type of the enumeration. */
11158 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11160 location_t saved_location;
11162 decl = TREE_VALUE (values);
11163 saved_location = input_location;
11164 input_location = DECL_SOURCE_LOCATION (decl);
11165 if (fixed_underlying_type_p)
11166 /* If the enumeration type has a fixed underlying type, we
11167 already checked all of the enumerator values. */
11168 value = DECL_INITIAL (decl);
11170 value = perform_implicit_conversion (underlying_type,
11171 DECL_INITIAL (decl),
11172 tf_warning_or_error);
11173 input_location = saved_location;
11175 /* Do not clobber shared ints. */
11176 value = copy_node (value);
11178 TREE_TYPE (value) = enumtype;
11179 DECL_INITIAL (decl) = value;
11182 /* Fix up all variant types of this enum type. */
11183 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11185 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11186 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11187 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11188 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11189 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11190 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11191 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11192 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11193 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11194 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11195 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11198 /* Finish up the scope of a scoped enumeration. */
11199 if (SCOPED_ENUM_P (enumtype))
11202 /* Finish debugging output for this type. */
11203 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11206 /* Build and install a CONST_DECL for an enumeration constant of the
11207 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11208 Assignment of sequential values by default is handled here. */
11211 build_enumerator (tree name, tree value, tree enumtype)
11217 /* If the VALUE was erroneous, pretend it wasn't there; that will
11218 result in the enum being assigned the next value in sequence. */
11219 if (value == error_mark_node)
11222 /* Remove no-op casts from the value. */
11224 STRIP_TYPE_NOPS (value);
11226 if (! processing_template_decl)
11228 /* Validate and default VALUE. */
11229 if (value != NULL_TREE)
11231 value = integral_constant_value (value);
11233 if (TREE_CODE (value) == INTEGER_CST)
11235 value = perform_integral_promotions (value);
11236 constant_expression_warning (value);
11240 error ("enumerator value for %qD is not an integer constant", name);
11245 /* Default based on previous value. */
11246 if (value == NULL_TREE)
11248 if (TYPE_VALUES (enumtype))
11251 unsigned HOST_WIDE_INT lo;
11255 /* The next value is the previous value plus one.
11256 add_double doesn't know the type of the target expression,
11257 so we must check with int_fits_type_p as well. */
11258 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11259 if (error_operand_p (prev_value))
11260 value = error_mark_node;
11263 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11264 TREE_INT_CST_HIGH (prev_value),
11266 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11268 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11272 error ("overflow in enumeration values at %qD", name);
11273 value = error_mark_node;
11278 value = integer_zero_node;
11281 /* Remove no-op casts from the value. */
11282 STRIP_TYPE_NOPS (value);
11284 /* If the underlying type of the enum is fixed, check whether
11285 the enumerator values fits in the underlying type. If it
11286 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11287 if (ENUM_UNDERLYING_TYPE (enumtype)
11289 && TREE_CODE (value) == INTEGER_CST
11290 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11292 error ("enumerator value %E is too large for underlying type %<%T%>",
11293 value, ENUM_UNDERLYING_TYPE (enumtype));
11295 /* Silently convert the value so that we can continue. */
11296 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11301 /* C++ associates enums with global, function, or class declarations. */
11302 context = current_scope ();
11304 /* Build the actual enumeration constant. Note that the enumeration
11305 constants have the underlying type of the enum (if it is fixed)
11306 or the type of their initializer (if the underlying type of the
11307 enum is not fixed):
11311 If the underlying type is fixed, the type of each enumerator
11312 prior to the closing brace is the underlying type; if the
11313 initializing value of an enumerator cannot be represented by
11314 the underlying type, the program is ill-formed. If the
11315 underlying type is not fixed, the type of each enumerator is
11316 the type of its initializing value.
11318 If the underlying type is not fixed, it will be computed by
11319 finish_enum and we will reset the type of this enumerator. Of
11320 course, if we're processing a template, there may be no value. */
11321 type = value ? TREE_TYPE (value) : NULL_TREE;
11323 if (context && context == current_class_type)
11324 /* This enum declaration is local to the class. We need the full
11325 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11326 decl = build_lang_decl (CONST_DECL, name, type);
11328 /* It's a global enum, or it's local to a function. (Note local to
11329 a function could mean local to a class method. */
11330 decl = build_decl (CONST_DECL, name, type);
11332 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11333 TREE_CONSTANT (decl) = 1;
11334 TREE_READONLY (decl) = 1;
11335 DECL_INITIAL (decl) = value;
11337 if (context && context == current_class_type)
11338 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11339 on the TYPE_FIELDS list for `S'. (That's so that you can say
11340 things like `S::i' later.) */
11341 finish_member_declaration (decl);
11345 /* Add this enumeration constant to the list for this type. */
11346 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11349 /* Look for an enumerator with the given NAME within the enumeration
11350 type ENUMTYPE. This routine is used primarily for qualified name
11351 lookup into an enumerator in C++0x, e.g.,
11353 enum class Color { Red, Green, Blue };
11355 Color color = Color::Red;
11357 Returns the value corresponding to the enumerator, or
11358 NULL_TREE if no such enumerator was found. */
11360 lookup_enumerator (tree enumtype, tree name)
11363 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11365 e = purpose_member (name, TYPE_VALUES (enumtype));
11366 return e? TREE_VALUE (e) : NULL_TREE;
11370 /* We're defining DECL. Make sure that it's type is OK. */
11373 check_function_type (tree decl, tree current_function_parms)
11375 tree fntype = TREE_TYPE (decl);
11376 tree return_type = complete_type (TREE_TYPE (fntype));
11378 /* In a function definition, arg types must be complete. */
11379 require_complete_types_for_parms (current_function_parms);
11381 if (dependent_type_p (return_type))
11383 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11384 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11386 tree args = TYPE_ARG_TYPES (fntype);
11388 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11389 error ("return type %q#T is incomplete", return_type);
11391 error ("return type has Java class type %q#T", return_type);
11393 /* Make it return void instead. */
11394 if (TREE_CODE (fntype) == METHOD_TYPE)
11395 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11397 TREE_CHAIN (args));
11399 fntype = build_function_type (void_type_node, args);
11401 = build_exception_variant (fntype,
11402 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11405 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11408 /* Create the FUNCTION_DECL for a function definition.
11409 DECLSPECS and DECLARATOR are the parts of the declaration;
11410 they describe the function's name and the type it returns,
11411 but twisted together in a fashion that parallels the syntax of C.
11413 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11414 DECLARATOR is really the DECL for the function we are about to
11415 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11416 indicating that the function is an inline defined in-class.
11418 This function creates a binding context for the function body
11419 as well as setting up the FUNCTION_DECL in current_function_decl.
11421 For C++, we must first check whether that datum makes any sense.
11422 For example, "class A local_a(1,2);" means that variable local_a
11423 is an aggregate of type A, which should have a constructor
11424 applied to it with the argument list [1, 2].
11426 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11427 or may be a BLOCK if the function has been defined previously
11428 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11429 error_mark_node if the function has never been defined, or
11430 a BLOCK if the function has been defined somewhere. */
11433 start_preparsed_function (tree decl1, tree attrs, int flags)
11435 tree ctype = NULL_TREE;
11438 int doing_friend = 0;
11439 struct cp_binding_level *bl;
11440 tree current_function_parms;
11441 struct c_fileinfo *finfo
11442 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11443 bool honor_interface;
11445 /* Sanity check. */
11446 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11447 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11449 fntype = TREE_TYPE (decl1);
11450 if (TREE_CODE (fntype) == METHOD_TYPE)
11451 ctype = TYPE_METHOD_BASETYPE (fntype);
11453 /* ISO C++ 11.4/5. A friend function defined in a class is in
11454 the (lexical) scope of the class in which it is defined. */
11455 if (!ctype && DECL_FRIEND_P (decl1))
11457 ctype = DECL_FRIEND_CONTEXT (decl1);
11459 /* CTYPE could be null here if we're dealing with a template;
11460 for example, `inline friend float foo()' inside a template
11461 will have no CTYPE set. */
11462 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11468 if (DECL_DECLARED_INLINE_P (decl1)
11469 && lookup_attribute ("noinline", attrs))
11470 warning (0, "inline function %q+D given attribute noinline", decl1);
11472 /* Handle gnu_inline attribute. */
11473 if (GNU_INLINE_P (decl1))
11475 DECL_EXTERNAL (decl1) = 1;
11476 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11477 DECL_INTERFACE_KNOWN (decl1) = 1;
11478 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11481 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11482 /* This is a constructor, we must ensure that any default args
11483 introduced by this definition are propagated to the clones
11484 now. The clones are used directly in overload resolution. */
11485 adjust_clone_args (decl1);
11487 /* Sometimes we don't notice that a function is a static member, and
11488 build a METHOD_TYPE for it. Fix that up now. */
11489 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11490 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11492 revert_static_member_fn (decl1);
11496 /* Set up current_class_type, and enter the scope of the class, if
11499 push_nested_class (ctype);
11500 else if (DECL_STATIC_FUNCTION_P (decl1))
11501 push_nested_class (DECL_CONTEXT (decl1));
11503 /* Now that we have entered the scope of the class, we must restore
11504 the bindings for any template parameters surrounding DECL1, if it
11505 is an inline member template. (Order is important; consider the
11506 case where a template parameter has the same name as a field of
11507 the class.) It is not until after this point that
11508 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11509 if (flags & SF_INCLASS_INLINE)
11510 maybe_begin_member_template_processing (decl1);
11512 /* Effective C++ rule 15. */
11514 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11515 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11516 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11518 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11519 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11520 if (!DECL_INITIAL (decl1))
11521 DECL_INITIAL (decl1) = error_mark_node;
11523 /* This function exists in static storage.
11524 (This does not mean `static' in the C sense!) */
11525 TREE_STATIC (decl1) = 1;
11527 /* We must call push_template_decl after current_class_type is set
11528 up. (If we are processing inline definitions after exiting a
11529 class scope, current_class_type will be NULL_TREE until set above
11530 by push_nested_class.) */
11531 if (processing_template_decl)
11533 /* FIXME: Handle error_mark_node more gracefully. */
11534 tree newdecl1 = push_template_decl (decl1);
11535 if (newdecl1 != error_mark_node)
11539 /* We are now in the scope of the function being defined. */
11540 current_function_decl = decl1;
11542 /* Save the parm names or decls from this function's declarator
11543 where store_parm_decls will find them. */
11544 current_function_parms = DECL_ARGUMENTS (decl1);
11546 /* Make sure the parameter and return types are reasonable. When
11547 you declare a function, these types can be incomplete, but they
11548 must be complete when you define the function. */
11549 check_function_type (decl1, current_function_parms);
11551 /* Build the return declaration for the function. */
11552 restype = TREE_TYPE (fntype);
11553 if (DECL_RESULT (decl1) == NULL_TREE)
11557 resdecl = build_decl (RESULT_DECL, 0, restype);
11558 DECL_ARTIFICIAL (resdecl) = 1;
11559 DECL_IGNORED_P (resdecl) = 1;
11560 DECL_RESULT (decl1) = resdecl;
11562 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11565 /* Let the user know we're compiling this function. */
11566 announce_function (decl1);
11568 /* Record the decl so that the function name is defined.
11569 If we already have a decl for this name, and it is a FUNCTION_DECL,
11570 use the old decl. */
11571 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11573 /* A specialization is not used to guide overload resolution. */
11574 if (!DECL_FUNCTION_MEMBER_P (decl1)
11575 && !(DECL_USE_TEMPLATE (decl1) &&
11576 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11578 tree olddecl = pushdecl (decl1);
11580 if (olddecl == error_mark_node)
11581 /* If something went wrong when registering the declaration,
11582 use DECL1; we have to have a FUNCTION_DECL to use when
11583 parsing the body of the function. */
11587 /* Otherwise, OLDDECL is either a previous declaration
11588 of the same function or DECL1 itself. */
11590 if (warn_missing_declarations
11591 && olddecl == decl1
11592 && !DECL_MAIN_P (decl1)
11593 && TREE_PUBLIC (decl1)
11594 && !DECL_DECLARED_INLINE_P (decl1))
11598 /* Check whether DECL1 is in an anonymous
11600 for (context = DECL_CONTEXT (decl1);
11602 context = DECL_CONTEXT (context))
11604 if (TREE_CODE (context) == NAMESPACE_DECL
11605 && DECL_NAME (context) == NULL_TREE)
11609 if (context == NULL)
11610 warning (OPT_Wmissing_declarations,
11611 "no previous declaration for %q+D", decl1);
11619 /* We need to set the DECL_CONTEXT. */
11620 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11621 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11623 fntype = TREE_TYPE (decl1);
11625 /* If #pragma weak applies, mark the decl appropriately now.
11626 The pragma only applies to global functions. Because
11627 determining whether or not the #pragma applies involves
11628 computing the mangled name for the declaration, we cannot
11629 apply the pragma until after we have merged this declaration
11630 with any previous declarations; if the original declaration
11631 has a linkage specification, that specification applies to
11632 the definition as well, and may affect the mangled name. */
11633 if (!DECL_CONTEXT (decl1))
11634 maybe_apply_pragma_weak (decl1);
11637 /* Reset this in case the call to pushdecl changed it. */
11638 current_function_decl = decl1;
11640 gcc_assert (DECL_INITIAL (decl1));
11642 /* This function may already have been parsed, in which case just
11643 return; our caller will skip over the body without parsing. */
11644 if (DECL_INITIAL (decl1) != error_mark_node)
11647 /* Initialize RTL machinery. We cannot do this until
11648 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11649 even when processing a template; this is how we get
11650 CFUN set up, and our per-function variables initialized.
11651 FIXME factor out the non-RTL stuff. */
11652 bl = current_binding_level;
11653 allocate_struct_function (decl1, processing_template_decl);
11655 /* Initialize the language data structures. Whenever we start
11656 a new function, we destroy temporaries in the usual way. */
11657 cfun->language = GGC_CNEW (struct language_function);
11658 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11659 current_binding_level = bl;
11661 /* Even though we're inside a function body, we still don't want to
11662 call expand_expr to calculate the size of a variable-sized array.
11663 We haven't necessarily assigned RTL to all variables yet, so it's
11664 not safe to try to expand expressions involving them. */
11665 cfun->dont_save_pending_sizes_p = 1;
11667 /* Start the statement-tree, start the tree now. */
11668 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11670 /* If we are (erroneously) defining a function that we have already
11671 defined before, wipe out what we knew before. */
11672 if (!DECL_PENDING_INLINE_P (decl1))
11673 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11675 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11677 /* We know that this was set up by `grokclassfn'. We do not
11678 wait until `store_parm_decls', since evil parse errors may
11679 never get us to that point. Here we keep the consistency
11680 between `current_class_type' and `current_class_ptr'. */
11681 tree t = DECL_ARGUMENTS (decl1);
11683 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11684 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11686 cp_function_chain->x_current_class_ref
11687 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11688 cp_function_chain->x_current_class_ptr = t;
11690 /* Constructors and destructors need to know whether they're "in
11691 charge" of initializing virtual base classes. */
11692 t = TREE_CHAIN (t);
11693 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11695 current_in_charge_parm = t;
11696 t = TREE_CHAIN (t);
11698 if (DECL_HAS_VTT_PARM_P (decl1))
11700 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11701 current_vtt_parm = t;
11705 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11706 /* Implicitly-defined methods (like the
11707 destructor for a class in which no destructor
11708 is explicitly declared) must not be defined
11709 until their definition is needed. So, we
11710 ignore interface specifications for
11711 compiler-generated functions. */
11712 && !DECL_ARTIFICIAL (decl1));
11714 if (DECL_INTERFACE_KNOWN (decl1))
11716 tree ctx = decl_function_context (decl1);
11718 if (DECL_NOT_REALLY_EXTERN (decl1))
11719 DECL_EXTERNAL (decl1) = 0;
11721 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11722 && TREE_PUBLIC (ctx))
11723 /* This is a function in a local class in an extern inline
11725 comdat_linkage (decl1);
11727 /* If this function belongs to an interface, it is public.
11728 If it belongs to someone else's interface, it is also external.
11729 This only affects inlines and template instantiations. */
11730 else if (!finfo->interface_unknown && honor_interface)
11732 if (DECL_DECLARED_INLINE_P (decl1)
11733 || DECL_TEMPLATE_INSTANTIATION (decl1)
11734 || processing_template_decl)
11736 DECL_EXTERNAL (decl1)
11737 = (finfo->interface_only
11738 || (DECL_DECLARED_INLINE_P (decl1)
11739 && ! flag_implement_inlines
11740 && !DECL_VINDEX (decl1)));
11742 /* For WIN32 we also want to put these in linkonce sections. */
11743 maybe_make_one_only (decl1);
11746 DECL_EXTERNAL (decl1) = 0;
11747 DECL_INTERFACE_KNOWN (decl1) = 1;
11748 /* If this function is in an interface implemented in this file,
11749 make sure that the back end knows to emit this function
11751 if (!DECL_EXTERNAL (decl1))
11752 mark_needed (decl1);
11754 else if (finfo->interface_unknown && finfo->interface_only
11755 && honor_interface)
11757 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11758 interface, we will have both finfo->interface_unknown and
11759 finfo->interface_only set. In that case, we don't want to
11760 use the normal heuristics because someone will supply a
11761 #pragma implementation elsewhere, and deducing it here would
11762 produce a conflict. */
11763 comdat_linkage (decl1);
11764 DECL_EXTERNAL (decl1) = 0;
11765 DECL_INTERFACE_KNOWN (decl1) = 1;
11766 DECL_DEFER_OUTPUT (decl1) = 1;
11770 /* This is a definition, not a reference.
11771 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11772 if (!GNU_INLINE_P (decl1))
11773 DECL_EXTERNAL (decl1) = 0;
11775 if ((DECL_DECLARED_INLINE_P (decl1)
11776 || DECL_TEMPLATE_INSTANTIATION (decl1))
11777 && ! DECL_INTERFACE_KNOWN (decl1)
11778 /* Don't try to defer nested functions for now. */
11779 && ! decl_function_context (decl1))
11780 DECL_DEFER_OUTPUT (decl1) = 1;
11782 DECL_INTERFACE_KNOWN (decl1) = 1;
11785 /* Determine the ELF visibility attribute for the function. We must not
11786 do this before calling "pushdecl", as we must allow "duplicate_decls"
11787 to merge any attributes appropriately. We also need to wait until
11789 if (!DECL_CLONED_FUNCTION_P (decl1))
11790 determine_visibility (decl1);
11792 begin_scope (sk_function_parms, decl1);
11796 if (DECL_DESTRUCTOR_P (decl1)
11797 || (DECL_CONSTRUCTOR_P (decl1)
11798 && targetm.cxx.cdtor_returns_this ()))
11800 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11801 DECL_CONTEXT (cdtor_label) = current_function_decl;
11804 start_fname_decls ();
11806 store_parm_decls (current_function_parms);
11810 /* Like start_preparsed_function, except that instead of a
11811 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11813 Returns 1 on success. If the DECLARATOR is not suitable for a function
11814 (it defines a datum instead), we return 0, which tells
11815 yyparse to report a parse error. */
11818 start_function (cp_decl_specifier_seq *declspecs,
11819 const cp_declarator *declarator,
11824 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11825 if (decl1 == error_mark_node)
11827 /* If the declarator is not suitable for a function definition,
11828 cause a syntax error. */
11829 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11831 error ("invalid function declaration");
11835 if (DECL_MAIN_P (decl1))
11836 /* main must return int. grokfndecl should have corrected it
11837 (and issued a diagnostic) if the user got it wrong. */
11838 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11839 integer_type_node));
11841 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11846 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11850 use_eh_spec_block (tree fn)
11852 return (flag_exceptions && flag_enforce_eh_specs
11853 && !processing_template_decl
11854 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11855 /* We insert the EH_SPEC_BLOCK only in the original
11856 function; then, it is copied automatically to the
11858 && !DECL_CLONED_FUNCTION_P (fn)
11859 /* Implicitly-generated constructors and destructors have
11860 exception specifications. However, those specifications
11861 are the union of the possible exceptions specified by the
11862 constructors/destructors for bases and members, so no
11863 unallowed exception will ever reach this function. By
11864 not creating the EH_SPEC_BLOCK we save a little memory,
11865 and we avoid spurious warnings about unreachable
11867 && !DECL_ARTIFICIAL (fn));
11870 /* Store the parameter declarations into the current function declaration.
11871 This is called after parsing the parameter declarations, before
11872 digesting the body of the function.
11874 Also install to binding contour return value identifier, if any. */
11877 store_parm_decls (tree current_function_parms)
11879 tree fndecl = current_function_decl;
11882 /* This is a chain of any other decls that came in among the parm
11883 declarations. If a parm is declared with enum {foo, bar} x;
11884 then CONST_DECLs for foo and bar are put here. */
11885 tree nonparms = NULL_TREE;
11887 if (current_function_parms)
11889 /* This case is when the function was defined with an ANSI prototype.
11890 The parms already have decls, so we need not do anything here
11891 except record them as in effect
11892 and complain if any redundant old-style parm decls were written. */
11894 tree specparms = current_function_parms;
11897 /* Must clear this because it might contain TYPE_DECLs declared
11899 current_binding_level->names = NULL;
11901 /* If we're doing semantic analysis, then we'll call pushdecl
11902 for each of these. We must do them in reverse order so that
11903 they end in the correct forward order. */
11904 specparms = nreverse (specparms);
11906 for (parm = specparms; parm; parm = next)
11908 next = TREE_CHAIN (parm);
11909 if (TREE_CODE (parm) == PARM_DECL)
11911 if (DECL_NAME (parm) == NULL_TREE
11912 || TREE_CODE (parm) != VOID_TYPE)
11915 error ("parameter %qD declared void", parm);
11919 /* If we find an enum constant or a type tag,
11920 put it aside for the moment. */
11921 TREE_CHAIN (parm) = NULL_TREE;
11922 nonparms = chainon (nonparms, parm);
11926 /* Get the decls in their original chain order and record in the
11927 function. This is all and only the PARM_DECLs that were
11928 pushed into scope by the loop above. */
11929 DECL_ARGUMENTS (fndecl) = getdecls ();
11932 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11934 /* Now store the final chain of decls for the arguments
11935 as the decl-chain of the current lexical scope.
11936 Put the enumerators in as well, at the front so that
11937 DECL_ARGUMENTS is not modified. */
11938 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11940 if (use_eh_spec_block (current_function_decl))
11941 current_eh_spec_block = begin_eh_spec_block ();
11945 /* We have finished doing semantic analysis on DECL, but have not yet
11946 generated RTL for its body. Save away our current state, so that
11947 when we want to generate RTL later we know what to do. */
11950 save_function_data (tree decl)
11952 struct language_function *f;
11954 /* Save the language-specific per-function data so that we can
11955 get it back when we really expand this function. */
11956 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11959 f = GGC_NEW (struct language_function);
11960 memcpy (f, cp_function_chain, sizeof (struct language_function));
11961 DECL_SAVED_FUNCTION_DATA (decl) = f;
11963 /* Clear out the bits we don't need. */
11964 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11965 f->bindings = NULL;
11966 f->x_local_names = NULL;
11970 /* Set the return value of the constructor (if present). */
11973 finish_constructor_body (void)
11978 if (targetm.cxx.cdtor_returns_this ()
11979 && (! TYPE_FOR_JAVA (current_class_type)))
11981 /* Any return from a constructor will end up here. */
11982 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11984 val = DECL_ARGUMENTS (current_function_decl);
11985 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11986 DECL_RESULT (current_function_decl), val);
11987 /* Return the address of the object. */
11988 exprstmt = build_stmt (RETURN_EXPR, val);
11989 add_stmt (exprstmt);
11993 /* Do all the processing for the beginning of a destructor; set up the
11994 vtable pointers and cleanups for bases and members. */
11997 begin_destructor_body (void)
11999 tree compound_stmt;
12001 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12002 issued an error message. We still want to try to process the
12003 body of the function, but initialize_vtbl_ptrs will crash if
12004 TYPE_BINFO is NULL. */
12005 if (COMPLETE_TYPE_P (current_class_type))
12007 compound_stmt = begin_compound_stmt (0);
12008 /* Make all virtual function table pointers in non-virtual base
12009 classes point to CURRENT_CLASS_TYPE's virtual function
12011 initialize_vtbl_ptrs (current_class_ptr);
12012 finish_compound_stmt (compound_stmt);
12014 /* And insert cleanups for our bases and members so that they
12015 will be properly destroyed if we throw. */
12016 push_base_cleanups ();
12020 /* At the end of every destructor we generate code to delete the object if
12021 necessary. Do that now. */
12024 finish_destructor_body (void)
12028 /* Any return from a destructor will end up here; that way all base
12029 and member cleanups will be run when the function returns. */
12030 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
12032 /* In a virtual destructor, we must call delete. */
12033 if (DECL_VIRTUAL_P (current_function_decl))
12036 tree virtual_size = cxx_sizeof (current_class_type);
12040 At the point of definition of a virtual destructor (including
12041 an implicit definition), non-placement operator delete shall
12042 be looked up in the scope of the destructor's class and if
12043 found shall be accessible and unambiguous. */
12044 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12046 /*global_p=*/false,
12047 /*placement=*/NULL_TREE,
12048 /*alloc_fn=*/NULL_TREE);
12050 if_stmt = begin_if_stmt ();
12051 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12052 current_in_charge_parm,
12055 finish_expr_stmt (exprstmt);
12056 finish_then_clause (if_stmt);
12057 finish_if_stmt (if_stmt);
12060 if (targetm.cxx.cdtor_returns_this ())
12064 val = DECL_ARGUMENTS (current_function_decl);
12065 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12066 DECL_RESULT (current_function_decl), val);
12067 /* Return the address of the object. */
12068 exprstmt = build_stmt (RETURN_EXPR, val);
12069 add_stmt (exprstmt);
12073 /* Do the necessary processing for the beginning of a function body, which
12074 in this case includes member-initializers, but not the catch clauses of
12075 a function-try-block. Currently, this means opening a binding level
12076 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12079 begin_function_body (void)
12083 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12086 if (processing_template_decl)
12087 /* Do nothing now. */;
12089 /* Always keep the BLOCK node associated with the outermost pair of
12090 curly braces of a function. These are needed for correct
12091 operation of dwarfout.c. */
12092 keep_next_level (true);
12094 stmt = begin_compound_stmt (BCS_FN_BODY);
12096 if (processing_template_decl)
12097 /* Do nothing now. */;
12098 else if (DECL_DESTRUCTOR_P (current_function_decl))
12099 begin_destructor_body ();
12104 /* Do the processing for the end of a function body. Currently, this means
12105 closing out the cleanups for fully-constructed bases and members, and in
12106 the case of the destructor, deleting the object if desired. Again, this
12107 is only meaningful for [cd]tors, since they are the only functions where
12108 there is a significant distinction between the main body and any
12109 function catch clauses. Handling, say, main() return semantics here
12110 would be wrong, as flowing off the end of a function catch clause for
12111 main() would also need to return 0. */
12114 finish_function_body (tree compstmt)
12116 if (compstmt == NULL_TREE)
12119 /* Close the block. */
12120 finish_compound_stmt (compstmt);
12122 if (processing_template_decl)
12123 /* Do nothing now. */;
12124 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12125 finish_constructor_body ();
12126 else if (DECL_DESTRUCTOR_P (current_function_decl))
12127 finish_destructor_body ();
12130 /* Given a function, returns the BLOCK corresponding to the outermost level
12131 of curly braces, skipping the artificial block created for constructor
12135 outer_curly_brace_block (tree fndecl)
12137 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12138 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12139 /* Skip the artificial function body block. */
12140 block = BLOCK_SUBBLOCKS (block);
12144 /* Finish up a function declaration and compile that function
12145 all the way to assembler language output. The free the storage
12146 for the function definition.
12148 FLAGS is a bitwise or of the following values:
12150 We just finished processing the body of an in-class inline
12151 function definition. (This processing will have taken place
12152 after the class definition is complete.) */
12155 finish_function (int flags)
12157 tree fndecl = current_function_decl;
12158 tree fntype, ctype = NULL_TREE;
12159 int inclass_inline = (flags & 2) != 0;
12162 /* When we get some parse errors, we can end up without a
12163 current_function_decl, so cope. */
12164 if (fndecl == NULL_TREE)
12165 return error_mark_node;
12167 gcc_assert (!defer_mark_used_calls);
12168 defer_mark_used_calls = true;
12170 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12171 && DECL_VIRTUAL_P (fndecl)
12172 && !processing_template_decl)
12174 tree fnclass = DECL_CONTEXT (fndecl);
12175 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12176 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12179 nested = function_depth > 1;
12180 fntype = TREE_TYPE (fndecl);
12182 /* TREE_READONLY (fndecl) = 1;
12183 This caused &foo to be of type ptr-to-const-function
12184 which then got a warning when stored in a ptr-to-function variable. */
12186 gcc_assert (building_stmt_tree ());
12187 /* The current function is being defined, so its DECL_INITIAL should
12188 be set, and unless there's a multiple definition, it should be
12189 error_mark_node. */
12190 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12192 /* For a cloned function, we've already got all the code we need;
12193 there's no need to add any extra bits. */
12194 if (!DECL_CLONED_FUNCTION_P (fndecl))
12196 if (DECL_MAIN_P (current_function_decl))
12200 /* Make it so that `main' always returns 0 by default (or
12203 stmt = finish_return_stmt (integer_one_node);
12205 stmt = finish_return_stmt (integer_zero_node);
12207 /* Hack. We don't want the middle-end to warn that this
12208 return is unreachable, so put the statement on the
12211 location_t linezero = linemap_line_start (line_table, 0, 1);
12212 SET_EXPR_LOCATION (stmt, linezero);
12216 if (use_eh_spec_block (current_function_decl))
12217 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12218 (TREE_TYPE (current_function_decl)),
12219 current_eh_spec_block);
12222 /* If we're saving up tree structure, tie off the function now. */
12223 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12225 finish_fname_decls ();
12227 /* If this function can't throw any exceptions, remember that. */
12228 if (!processing_template_decl
12229 && !cp_function_chain->can_throw
12230 && !flag_non_call_exceptions
12231 && !DECL_REPLACEABLE_P (fndecl))
12232 TREE_NOTHROW (fndecl) = 1;
12234 /* This must come after expand_function_end because cleanups might
12235 have declarations (from inline functions) that need to go into
12236 this function's blocks. */
12238 /* If the current binding level isn't the outermost binding level
12239 for this function, either there is a bug, or we have experienced
12240 syntax errors and the statement tree is malformed. */
12241 if (current_binding_level->kind != sk_function_parms)
12243 /* Make sure we have already experienced errors. */
12244 gcc_assert (errorcount);
12246 /* Throw away the broken statement tree and extra binding
12248 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12250 while (current_binding_level->kind != sk_function_parms)
12252 if (current_binding_level->kind == sk_class)
12253 pop_nested_class ();
12255 poplevel (0, 0, 0);
12258 poplevel (1, 0, 1);
12260 /* Statements should always be full-expressions at the outermost set
12261 of curly braces for a function. */
12262 gcc_assert (stmts_are_full_exprs_p ());
12264 /* Set up the named return value optimization, if we can. Candidate
12265 variables are selected in check_return_expr. */
12266 if (current_function_return_value)
12268 tree r = current_function_return_value;
12271 if (r != error_mark_node
12272 /* This is only worth doing for fns that return in memory--and
12273 simpler, since we don't have to worry about promoted modes. */
12274 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12275 /* Only allow this for variables declared in the outer scope of
12276 the function so we know that their lifetime always ends with a
12277 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12278 we were to do this optimization in tree-ssa. */
12279 && (outer = outer_curly_brace_block (fndecl))
12280 && chain_member (r, BLOCK_VARS (outer)))
12281 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12283 current_function_return_value = NULL_TREE;
12286 /* Remember that we were in class scope. */
12287 if (current_class_name)
12288 ctype = current_class_type;
12290 /* Must mark the RESULT_DECL as being in this function. */
12291 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12293 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12294 to the FUNCTION_DECL node itself. */
12295 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12297 /* Save away current state, if appropriate. */
12298 if (!processing_template_decl)
12299 save_function_data (fndecl);
12301 /* Complain if there's just no return statement. */
12302 if (warn_return_type
12303 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12304 && !dependent_type_p (TREE_TYPE (fntype))
12305 && !current_function_returns_value && !current_function_returns_null
12306 /* Don't complain if we abort or throw. */
12307 && !current_function_returns_abnormally
12308 && !DECL_NAME (DECL_RESULT (fndecl))
12309 && !TREE_NO_WARNING (fndecl)
12310 /* Structor return values (if any) are set by the compiler. */
12311 && !DECL_CONSTRUCTOR_P (fndecl)
12312 && !DECL_DESTRUCTOR_P (fndecl))
12314 warning (OPT_Wreturn_type,
12315 "no return statement in function returning non-void");
12316 TREE_NO_WARNING (fndecl) = 1;
12319 /* Store the end of the function, so that we get good line number
12320 info for the epilogue. */
12321 cfun->function_end_locus = input_location;
12323 /* Genericize before inlining. */
12324 if (!processing_template_decl)
12326 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12327 cp_genericize (fndecl);
12328 /* Clear out the bits we don't need. */
12329 f->x_current_class_ptr = NULL;
12330 f->x_current_class_ref = NULL;
12331 f->x_eh_spec_block = NULL;
12332 f->x_in_charge_parm = NULL;
12333 f->x_vtt_parm = NULL;
12334 f->x_return_value = NULL;
12335 f->bindings = NULL;
12336 f->extern_decl_map = NULL;
12338 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12339 c_warn_unused_result (gimple_body (fndecl));
12341 /* Clear out the bits we don't need. */
12342 local_names = NULL;
12344 /* We're leaving the context of this function, so zap cfun. It's still in
12345 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12347 current_function_decl = NULL;
12349 /* If this is an in-class inline definition, we may have to pop the
12350 bindings for the template parameters that we added in
12351 maybe_begin_member_template_processing when start_function was
12353 if (inclass_inline)
12354 maybe_end_member_template_processing ();
12356 /* Leave the scope of the class. */
12358 pop_nested_class ();
12364 /* Let the error reporting routines know that we're outside a
12365 function. For a nested function, this value is used in
12366 cxx_pop_function_context and then reset via pop_function_context. */
12367 current_function_decl = NULL_TREE;
12369 defer_mark_used_calls = false;
12370 if (deferred_mark_used_calls)
12375 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12377 VEC_free (tree, gc, deferred_mark_used_calls);
12383 /* Create the FUNCTION_DECL for a function definition.
12384 DECLSPECS and DECLARATOR are the parts of the declaration;
12385 they describe the return type and the name of the function,
12386 but twisted together in a fashion that parallels the syntax of C.
12388 This function creates a binding context for the function body
12389 as well as setting up the FUNCTION_DECL in current_function_decl.
12391 Returns a FUNCTION_DECL on success.
12393 If the DECLARATOR is not suitable for a function (it defines a datum
12394 instead), we return 0, which tells yyparse to report a parse error.
12396 May return void_type_node indicating that this method is actually
12397 a friend. See grokfield for more details.
12399 Came here with a `.pushlevel' .
12401 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12402 CHANGES TO CODE IN `grokfield'. */
12405 start_method (cp_decl_specifier_seq *declspecs,
12406 const cp_declarator *declarator, tree attrlist)
12408 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12411 if (fndecl == error_mark_node)
12412 return error_mark_node;
12414 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12416 error ("invalid member function declaration");
12417 return error_mark_node;
12421 cplus_decl_attributes (&fndecl, attrlist, 0);
12423 /* Pass friends other than inline friend functions back. */
12424 if (fndecl == void_type_node)
12427 if (DECL_IN_AGGR_P (fndecl))
12429 if (DECL_CONTEXT (fndecl)
12430 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12431 error ("%qD is already defined in class %qT", fndecl,
12432 DECL_CONTEXT (fndecl));
12433 return error_mark_node;
12436 check_template_shadow (fndecl);
12438 DECL_DECLARED_INLINE_P (fndecl) = 1;
12439 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12441 /* We process method specializations in finish_struct_1. */
12442 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12444 fndecl = push_template_decl (fndecl);
12445 if (fndecl == error_mark_node)
12449 if (! DECL_FRIEND_P (fndecl))
12451 if (TREE_CHAIN (fndecl))
12453 fndecl = copy_node (fndecl);
12454 TREE_CHAIN (fndecl) = NULL_TREE;
12458 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12460 /* Make a place for the parms. */
12461 begin_scope (sk_function_parms, fndecl);
12463 DECL_IN_AGGR_P (fndecl) = 1;
12467 /* Go through the motions of finishing a function definition.
12468 We don't compile this method until after the whole class has
12471 FINISH_METHOD must return something that looks as though it
12472 came from GROKFIELD (since we are defining a method, after all).
12474 This is called after parsing the body of the function definition.
12475 STMTS is the chain of statements that makes up the function body.
12477 DECL is the ..._DECL that `start_method' provided. */
12480 finish_method (tree decl)
12482 tree fndecl = decl;
12487 if (decl == void_type_node)
12490 old_initial = DECL_INITIAL (fndecl);
12492 /* Undo the level for the parms (from start_method).
12493 This is like poplevel, but it causes nothing to be
12494 saved. Saving information here confuses symbol-table
12495 output routines. Besides, this information will
12496 be correctly output when this method is actually
12499 /* Clear out the meanings of the local variables of this level;
12500 also record in each decl which block it belongs to. */
12502 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12504 if (DECL_NAME (link) != NULL_TREE)
12505 pop_binding (DECL_NAME (link), link);
12506 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12507 DECL_CONTEXT (link) = NULL_TREE;
12510 poplevel (0, 0, 0);
12512 DECL_INITIAL (fndecl) = old_initial;
12514 /* We used to check if the context of FNDECL was different from
12515 current_class_type as another way to get inside here. This didn't work
12516 for String.cc in libg++. */
12517 if (DECL_FRIEND_P (fndecl))
12519 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12521 decl = void_type_node;
12528 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12529 we can lay it out later, when and if its type becomes complete. */
12532 maybe_register_incomplete_var (tree var)
12534 gcc_assert (TREE_CODE (var) == VAR_DECL);
12536 /* Keep track of variables with incomplete types. */
12537 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12538 && DECL_EXTERNAL (var))
12540 tree inner_type = TREE_TYPE (var);
12542 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12543 inner_type = TREE_TYPE (inner_type);
12544 inner_type = TYPE_MAIN_VARIANT (inner_type);
12546 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12547 /* RTTI TD entries are created while defining the type_info. */
12548 || (TYPE_LANG_SPECIFIC (inner_type)
12549 && TYPE_BEING_DEFINED (inner_type)))
12550 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12554 /* Called when a class type (given by TYPE) is defined. If there are
12555 any existing VAR_DECLs whose type has been completed by this
12556 declaration, update them now. */
12559 complete_vars (tree type)
12561 tree *list = &incomplete_vars;
12563 gcc_assert (CLASS_TYPE_P (type));
12566 if (same_type_p (type, TREE_PURPOSE (*list)))
12568 tree var = TREE_VALUE (*list);
12569 tree type = TREE_TYPE (var);
12570 /* Complete the type of the variable. The VAR_DECL itself
12571 will be laid out in expand_expr. */
12572 complete_type (type);
12573 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12574 /* Remove this entry from the list. */
12575 *list = TREE_CHAIN (*list);
12578 list = &TREE_CHAIN (*list);
12581 /* Check for pending declarations which may have abstract type. */
12582 complete_type_check_abstract (type);
12585 /* If DECL is of a type which needs a cleanup, build and return an
12586 expression to perform that cleanup here. Return NULL_TREE if no
12587 cleanup need be done. */
12590 cxx_maybe_build_cleanup (tree decl)
12596 /* Assume no cleanup is required. */
12597 cleanup = NULL_TREE;
12599 if (error_operand_p (decl))
12602 /* Handle "__attribute__((cleanup))". We run the cleanup function
12603 before the destructor since the destructor is what actually
12604 terminates the lifetime of the object. */
12605 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12612 /* Get the name specified by the user for the cleanup function. */
12613 id = TREE_VALUE (TREE_VALUE (attr));
12614 /* Look up the name to find the cleanup function to call. It is
12615 important to use lookup_name here because that is what is
12616 used in c-common.c:handle_cleanup_attribute when performing
12617 initial checks on the attribute. Note that those checks
12618 include ensuring that the function found is not an overloaded
12619 function, or an object with an overloaded call operator,
12620 etc.; we can rely on the fact that the function found is an
12621 ordinary FUNCTION_DECL. */
12622 fn = lookup_name (id);
12623 arg = build_address (decl);
12625 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12627 tf_warning_or_error);
12629 /* Handle ordinary C++ destructors. */
12630 type = TREE_TYPE (decl);
12631 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12633 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12634 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12635 && CLASSTYPE_VBASECLASSES (type));
12639 if (TREE_CODE (type) == ARRAY_TYPE)
12642 addr = build_address (decl);
12644 /* Optimize for space over speed here. */
12645 if (!has_vbases || flag_expensive_optimizations)
12646 flags |= LOOKUP_NONVIRTUAL;
12648 call = build_delete (TREE_TYPE (addr), addr,
12649 sfk_complete_destructor, flags, 0);
12651 cleanup = build_compound_expr (cleanup, call);
12659 /* When a stmt has been parsed, this function is called. */
12666 /* DECL was originally constructed as a non-static member function,
12667 but turned out to be static. Update it accordingly. */
12670 revert_static_member_fn (tree decl)
12673 tree function = TREE_TYPE (decl);
12674 tree args = TYPE_ARG_TYPES (function);
12676 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12677 != TYPE_UNQUALIFIED)
12678 error ("static member function %q#D declared with type qualifiers", decl);
12680 args = TREE_CHAIN (args);
12681 tmp = build_function_type (TREE_TYPE (function), args);
12682 tmp = build_qualified_type (tmp, cp_type_quals (function));
12683 tmp = build_exception_variant (tmp,
12684 TYPE_RAISES_EXCEPTIONS (function));
12685 TREE_TYPE (decl) = tmp;
12686 if (DECL_ARGUMENTS (decl))
12687 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12688 DECL_STATIC_FUNCTION_P (decl) = 1;
12691 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12692 one of the language-independent trees. */
12694 enum cp_tree_node_structure_enum
12695 cp_tree_node_structure (union lang_tree_node * t)
12697 switch (TREE_CODE (&t->generic))
12699 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12700 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12701 case OVERLOAD: return TS_CP_OVERLOAD;
12702 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12703 case PTRMEM_CST: return TS_CP_PTRMEM;
12704 case BASELINK: return TS_CP_BASELINK;
12705 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12706 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12707 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12708 default: return TS_CP_GENERIC;
12712 /* Build the void_list_node (void_type_node having been created). */
12714 build_void_list_node (void)
12716 tree t = build_tree_list (NULL_TREE, void_type_node);
12721 cp_missing_noreturn_ok_p (tree decl)
12723 /* A missing noreturn is ok for the `main' function. */
12724 return DECL_MAIN_P (decl);
12727 /* Return the COMDAT group into which DECL should be placed. */
12730 cxx_comdat_group (tree decl)
12734 /* Virtual tables, construction virtual tables, and virtual table
12735 tables all go in a single COMDAT group, named after the primary
12737 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12738 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12739 /* For all other DECLs, the COMDAT group is the mangled name of the
12740 declaration itself. */
12743 while (DECL_THUNK_P (decl))
12745 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12746 into the same section as the target function. In that case
12747 we must return target's name. */
12748 tree target = THUNK_TARGET (decl);
12749 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12750 && DECL_SECTION_NAME (target) != NULL
12751 && DECL_ONE_ONLY (target))
12756 name = DECL_ASSEMBLER_NAME (decl);
12759 return IDENTIFIER_POINTER (name);
12762 #include "gt-cp-decl.h"