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 if (ce->index == error_mark_node)
4423 error ("name used in a GNU-style designated "
4424 "initializer for an array");
4427 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4428 error ("name %qD used in a GNU-style designated "
4429 "initializer for an array", ce->index);
4437 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4438 array until we finish parsing the initializer. If that's the
4439 situation we're in, update DECL accordingly. */
4442 maybe_deduce_size_from_array_init (tree decl, tree init)
4444 tree type = TREE_TYPE (decl);
4446 if (TREE_CODE (type) == ARRAY_TYPE
4447 && TYPE_DOMAIN (type) == NULL_TREE
4448 && TREE_CODE (decl) != TYPE_DECL)
4450 /* do_default is really a C-ism to deal with tentative definitions.
4451 But let's leave it here to ease the eventual merge. */
4452 int do_default = !DECL_EXTERNAL (decl);
4453 tree initializer = init ? init : DECL_INITIAL (decl);
4456 /* Check that there are no designated initializers in INIT, as
4457 those are not supported in GNU C++, and as the middle-end
4458 will crash if presented with a non-numeric designated
4460 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4462 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4463 constructor_elt *ce;
4466 VEC_iterate (constructor_elt, v, i, ce);
4468 if (!check_array_designated_initializer (ce))
4474 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4478 error ("initializer fails to determine size of %qD", decl);
4479 TREE_TYPE (decl) = error_mark_node;
4481 else if (failure == 2)
4485 error ("array size missing in %qD", decl);
4486 TREE_TYPE (decl) = error_mark_node;
4488 /* If a `static' var's size isn't known, make it extern as
4489 well as static, so it does not get allocated. If it's not
4490 `static', then don't mark it extern; finish_incomplete_decl
4491 will give it a default size and it will get allocated. */
4492 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4493 DECL_EXTERNAL (decl) = 1;
4495 else if (failure == 3)
4497 error ("zero-size array %qD", decl);
4498 TREE_TYPE (decl) = error_mark_node;
4502 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4504 layout_decl (decl, 0);
4508 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4509 any appropriate error messages regarding the layout. */
4512 layout_var_decl (tree decl)
4516 type = TREE_TYPE (decl);
4517 if (type == error_mark_node)
4520 /* If we haven't already layed out this declaration, do so now.
4521 Note that we must not call complete type for an external object
4522 because it's type might involve templates that we are not
4523 supposed to instantiate yet. (And it's perfectly valid to say
4524 `extern X x' for some incomplete type `X'.) */
4525 if (!DECL_EXTERNAL (decl))
4526 complete_type (type);
4527 if (!DECL_SIZE (decl)
4528 && TREE_TYPE (decl) != error_mark_node
4529 && (COMPLETE_TYPE_P (type)
4530 || (TREE_CODE (type) == ARRAY_TYPE
4531 && !TYPE_DOMAIN (type)
4532 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4533 layout_decl (decl, 0);
4535 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4537 /* An automatic variable with an incomplete type: that is an error.
4538 Don't talk about array types here, since we took care of that
4539 message in grokdeclarator. */
4540 error ("storage size of %qD isn't known", decl);
4541 TREE_TYPE (decl) = error_mark_node;
4544 /* Keep this code around in case we later want to control debug info
4545 based on whether a type is "used". (jason 1999-11-11) */
4547 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4548 /* Let debugger know it should output info for this type. */
4549 note_debug_info_needed (ttype);
4551 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4552 note_debug_info_needed (DECL_CONTEXT (decl));
4555 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4556 && DECL_SIZE (decl) != NULL_TREE
4557 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4559 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4560 constant_expression_warning (DECL_SIZE (decl));
4563 error ("storage size of %qD isn't constant", decl);
4564 TREE_TYPE (decl) = error_mark_node;
4569 /* If a local static variable is declared in an inline function, or if
4570 we have a weak definition, we must endeavor to create only one
4571 instance of the variable at link-time. */
4574 maybe_commonize_var (tree decl)
4576 /* Static data in a function with comdat linkage also has comdat
4578 if (TREE_STATIC (decl)
4579 /* Don't mess with __FUNCTION__. */
4580 && ! DECL_ARTIFICIAL (decl)
4581 && DECL_FUNCTION_SCOPE_P (decl)
4582 /* Unfortunately, import_export_decl has not always been called
4583 before the function is processed, so we cannot simply check
4585 && (DECL_COMDAT (DECL_CONTEXT (decl))
4586 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4587 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4588 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4592 /* With weak symbols, we simply make the variable COMDAT;
4593 that will cause copies in multiple translations units to
4595 comdat_linkage (decl);
4599 if (DECL_INITIAL (decl) == NULL_TREE
4600 || DECL_INITIAL (decl) == error_mark_node)
4602 /* Without weak symbols, we can use COMMON to merge
4603 uninitialized variables. */
4604 TREE_PUBLIC (decl) = 1;
4605 DECL_COMMON (decl) = 1;
4609 /* While for initialized variables, we must use internal
4610 linkage -- which means that multiple copies will not
4612 TREE_PUBLIC (decl) = 0;
4613 DECL_COMMON (decl) = 0;
4614 warning (0, "sorry: semantics of inline function static "
4615 "data %q+#D are wrong (you'll wind up "
4616 "with multiple copies)", decl);
4617 warning (0, "%J you can work around this by removing "
4623 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4624 /* Set it up again; we might have set DECL_INITIAL since the last
4626 comdat_linkage (decl);
4629 /* Issue an error message if DECL is an uninitialized const variable. */
4632 check_for_uninitialized_const_var (tree decl)
4634 tree type = TREE_TYPE (decl);
4636 /* ``Unless explicitly declared extern, a const object does not have
4637 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4639 if (TREE_CODE (decl) == VAR_DECL
4640 && TREE_CODE (type) != REFERENCE_TYPE
4641 && CP_TYPE_CONST_P (type)
4642 && !TYPE_NEEDS_CONSTRUCTING (type)
4643 && !DECL_INITIAL (decl))
4644 error ("uninitialized const %qD", decl);
4648 /* Structure holding the current initializer being processed by reshape_init.
4649 CUR is a pointer to the current element being processed, END is a pointer
4650 after the last element present in the initializer. */
4651 typedef struct reshape_iterator_t
4653 constructor_elt *cur;
4654 constructor_elt *end;
4657 static tree reshape_init_r (tree, reshape_iter *, bool);
4659 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4660 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4661 initialized. If there are no more such fields, the return value
4665 next_initializable_field (tree field)
4668 && (TREE_CODE (field) != FIELD_DECL
4669 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4670 || DECL_ARTIFICIAL (field)))
4671 field = TREE_CHAIN (field);
4676 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4677 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4678 INTEGER_CST representing the size of the array minus one (the maximum index),
4679 or NULL_TREE if the array was declared without specifying the size. D is
4680 the iterator within the constructor. */
4683 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4686 bool sized_array_p = (max_index != NULL_TREE);
4687 unsigned HOST_WIDE_INT max_index_cst = 0;
4688 unsigned HOST_WIDE_INT index;
4690 /* The initializer for an array is always a CONSTRUCTOR. */
4691 new_init = build_constructor (init_list_type_node, NULL);
4695 /* Minus 1 is used for zero sized arrays. */
4696 if (integer_all_onesp (max_index))
4699 if (host_integerp (max_index, 1))
4700 max_index_cst = tree_low_cst (max_index, 1);
4701 /* sizetype is sign extended, not zero extended. */
4703 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4707 /* Loop until there are no more initializers. */
4709 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4714 check_array_designated_initializer (d->cur);
4715 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4716 if (elt_init == error_mark_node)
4717 return error_mark_node;
4718 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4724 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4725 Parameters are the same of reshape_init_r. */
4728 reshape_init_array (tree type, reshape_iter *d)
4730 tree max_index = NULL_TREE;
4732 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4734 if (TYPE_DOMAIN (type))
4735 max_index = array_type_nelts (type);
4737 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4740 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4741 Parameters are the same of reshape_init_r. */
4744 reshape_init_vector (tree type, reshape_iter *d)
4746 tree max_index = NULL_TREE;
4749 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4751 if (COMPOUND_LITERAL_P (d->cur->value))
4753 tree value = d->cur->value;
4754 if (!same_type_p (TREE_TYPE (value), type))
4756 error ("invalid type %qT as initializer for a vector of type %qT",
4757 TREE_TYPE (d->cur->value), type);
4758 value = error_mark_node;
4764 /* For a vector, the representation type is a struct
4765 containing a single member which is an array of the
4766 appropriate size. */
4767 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4768 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4769 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4771 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4774 /* Subroutine of reshape_init_r, processes the initializers for classes
4775 or union. Parameters are the same of reshape_init_r. */
4778 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4783 gcc_assert (CLASS_TYPE_P (type));
4785 /* The initializer for a class is always a CONSTRUCTOR. */
4786 new_init = build_constructor (init_list_type_node, NULL);
4787 field = next_initializable_field (TYPE_FIELDS (type));
4793 An initializer for an aggregate member that is an
4794 empty class shall have the form of an empty
4795 initializer-list {}. */
4796 if (!first_initializer_p)
4798 error ("initializer for %qT must be brace-enclosed", type);
4799 return error_mark_node;
4804 /* Loop through the initializable fields, gathering initializers. */
4805 while (d->cur != d->end)
4809 /* Handle designated initializers, as an extension. */
4812 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4814 if (!field || TREE_CODE (field) != FIELD_DECL)
4816 error ("%qT has no non-static data member named %qD", type,
4818 return error_mark_node;
4822 /* If we processed all the member of the class, we are done. */
4826 field_init = reshape_init_r (TREE_TYPE (field), d,
4827 /*first_initializer_p=*/false);
4828 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4832 When a union is initialized with a brace-enclosed
4833 initializer, the braces shall only contain an
4834 initializer for the first member of the union. */
4835 if (TREE_CODE (type) == UNION_TYPE)
4838 field = next_initializable_field (TREE_CHAIN (field));
4844 /* Subroutine of reshape_init, which processes a single initializer (part of
4845 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4846 iterator within the CONSTRUCTOR which points to the initializer to process.
4847 FIRST_INITIALIZER_P is true if this is the first initializer of the
4848 CONSTRUCTOR node. */
4851 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4853 tree init = d->cur->value;
4855 if (error_operand_p (init))
4856 return error_mark_node;
4858 /* A non-aggregate type is always initialized with a single
4860 if (!CP_AGGREGATE_TYPE_P (type))
4862 /* It is invalid to initialize a non-aggregate type with a
4863 brace-enclosed initializer before C++0x.
4864 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4865 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4866 a CONSTRUCTOR (with a record type). */
4867 if (TREE_CODE (init) == CONSTRUCTOR
4868 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4870 if (SCALAR_TYPE_P (type))
4872 error ("braces around scalar initializer for type %qT", type);
4873 init = error_mark_node;
4876 maybe_warn_cpp0x ("extended initializer lists");
4885 All implicit type conversions (clause _conv_) are considered when
4886 initializing the aggregate member with an initializer from an
4887 initializer-list. If the initializer can initialize a member,
4888 the member is initialized. Otherwise, if the member is itself a
4889 non-empty subaggregate, brace elision is assumed and the
4890 initializer is considered for the initialization of the first
4891 member of the subaggregate. */
4892 if (TREE_CODE (init) != CONSTRUCTOR
4893 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4899 /* [dcl.init.string]
4901 A char array (whether plain char, signed char, or unsigned char)
4902 can be initialized by a string-literal (optionally enclosed in
4903 braces); a wchar_t array can be initialized by a wide
4904 string-literal (optionally enclosed in braces). */
4905 if (TREE_CODE (type) == ARRAY_TYPE
4906 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4908 tree str_init = init;
4910 /* Strip one level of braces if and only if they enclose a single
4911 element (as allowed by [dcl.init.string]). */
4912 if (!first_initializer_p
4913 && TREE_CODE (str_init) == CONSTRUCTOR
4914 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4916 str_init = VEC_index (constructor_elt,
4917 CONSTRUCTOR_ELTS (str_init), 0)->value;
4920 /* If it's a string literal, then it's the initializer for the array
4921 as a whole. Otherwise, continue with normal initialization for
4922 array types (one value per array element). */
4923 if (TREE_CODE (str_init) == STRING_CST)
4930 /* The following cases are about aggregates. If we are not within a full
4931 initializer already, and there is not a CONSTRUCTOR, it means that there
4932 is a missing set of braces (that is, we are processing the case for
4933 which reshape_init exists). */
4934 if (!first_initializer_p)
4936 if (TREE_CODE (init) == CONSTRUCTOR)
4938 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4939 /* There is no need to reshape pointer-to-member function
4940 initializers, as they are always constructed correctly
4941 by the front end. */
4943 else if (COMPOUND_LITERAL_P (init))
4944 /* For a nested compound literal, there is no need to reshape since
4945 brace elision is not allowed. Even if we decided to allow it,
4946 we should add a call to reshape_init in finish_compound_literal,
4947 before calling digest_init, so changing this code would still
4948 not be necessary. */
4949 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4953 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4954 return reshape_init (type, init);
4958 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4962 /* Dispatch to specialized routines. */
4963 if (CLASS_TYPE_P (type))
4964 return reshape_init_class (type, d, first_initializer_p);
4965 else if (TREE_CODE (type) == ARRAY_TYPE)
4966 return reshape_init_array (type, d);
4967 else if (TREE_CODE (type) == VECTOR_TYPE)
4968 return reshape_init_vector (type, d);
4973 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4974 brace-enclosed aggregate initializer.
4976 INIT is the CONSTRUCTOR containing the list of initializers describing
4977 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4978 It may not presently match the shape of the TYPE; for example:
4980 struct S { int a; int b; };
4981 struct S a[] = { 1, 2, 3, 4 };
4983 Here INIT will hold a VEC of four elements, rather than a
4984 VEC of two elements, each itself a VEC of two elements. This
4985 routine transforms INIT from the former form into the latter. The
4986 revised CONSTRUCTOR node is returned. */
4989 reshape_init (tree type, tree init)
4991 VEC(constructor_elt, gc) *v;
4995 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4997 v = CONSTRUCTOR_ELTS (init);
4999 /* An empty constructor does not need reshaping, and it is always a valid
5001 if (VEC_empty (constructor_elt, v))
5004 /* Recurse on this CONSTRUCTOR. */
5005 d.cur = VEC_index (constructor_elt, v, 0);
5006 d.end = d.cur + VEC_length (constructor_elt, v);
5008 new_init = reshape_init_r (type, &d, true);
5009 if (new_init == error_mark_node)
5010 return error_mark_node;
5012 /* Make sure all the element of the constructor were used. Otherwise,
5013 issue an error about exceeding initializers. */
5015 error ("too many initializers for %qT", type);
5020 /* Verify array initializer. Returns true if errors have been reported. */
5023 check_array_initializer (tree decl, tree type, tree init)
5025 tree element_type = TREE_TYPE (type);
5027 /* The array type itself need not be complete, because the
5028 initializer may tell us how many elements are in the array.
5029 But, the elements of the array must be complete. */
5030 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5033 error ("elements of array %q#D have incomplete type", decl);
5035 error ("elements of array %q#T have incomplete type", type);
5038 /* It is not valid to initialize a VLA. */
5040 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5041 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5044 error ("variable-sized object %qD may not be initialized", decl);
5046 error ("variable-sized compound literal");
5052 /* Subroutine of check_initializer; args are passed down from that function.
5053 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5056 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5059 int saved_stmts_are_full_exprs_p = 0;
5060 if (building_stmt_tree ())
5062 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5063 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5065 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5066 if (building_stmt_tree ())
5067 current_stmt_tree ()->stmts_are_full_exprs_p =
5068 saved_stmts_are_full_exprs_p;
5072 /* Verify INIT (the initializer for DECL), and record the
5073 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5074 grok_reference_init.
5076 If the return value is non-NULL, it is an expression that must be
5077 evaluated dynamically to initialize DECL. */
5080 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5082 tree type = TREE_TYPE (decl);
5083 tree init_code = NULL;
5085 /* Things that are going to be initialized need to have complete
5087 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5089 if (type == error_mark_node)
5090 /* We will have already complained. */
5093 if (TREE_CODE (type) == ARRAY_TYPE)
5095 if (check_array_initializer (decl, type, init))
5098 else if (!COMPLETE_TYPE_P (type))
5100 error ("%qD has incomplete type", decl);
5101 TREE_TYPE (decl) = error_mark_node;
5105 /* There is no way to make a variable-sized class type in GNU C++. */
5106 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5108 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5110 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5111 if (SCALAR_TYPE_P (type))
5115 maybe_warn_cpp0x ("extended initializer lists");
5116 init = build_zero_init (type, NULL_TREE, false);
5118 else if (init_len != 1)
5120 error ("scalar object %qD requires one element in initializer",
5122 TREE_TYPE (decl) = error_mark_node;
5128 if (TREE_CODE (decl) == CONST_DECL)
5130 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5132 DECL_INITIAL (decl) = init;
5134 gcc_assert (init != NULL_TREE);
5137 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5138 init = grok_reference_init (decl, type, init, cleanup);
5141 /* Do not reshape constructors of vectors (they don't need to be
5143 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5145 if (is_std_init_list (type))
5146 return build_init_list_var_init (decl, type, init, cleanup);
5147 else if (TYPE_NON_AGGREGATE_CLASS (type))
5149 /* Don't reshape if the class has constructors. */
5150 if (cxx_dialect == cxx98)
5151 error ("in C++98 %qD must be initialized by constructor, "
5154 init = build_tree_list (NULL_TREE, init);
5156 else if ((*targetm.vector_opaque_p) (type))
5158 error ("opaque vector types cannot be initialized");
5159 init = error_mark_node;
5162 init = reshape_init (type, init);
5165 /* If DECL has an array type without a specific bound, deduce the
5166 array size from the initializer. */
5167 maybe_deduce_size_from_array_init (decl, init);
5168 type = TREE_TYPE (decl);
5169 if (type == error_mark_node)
5172 if (TYPE_NEEDS_CONSTRUCTING (type)
5173 || (CLASS_TYPE_P (type)
5174 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5175 return build_aggr_init_full_exprs (decl, init, flags);
5176 else if (TREE_CODE (init) != TREE_VEC)
5178 init_code = store_init_value (decl, init);
5179 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5180 && DECL_INITIAL (decl)
5181 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5182 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5183 warning (0, "array %qD initialized by parenthesized string literal %qE",
5184 decl, DECL_INITIAL (decl));
5188 else if (DECL_EXTERNAL (decl))
5190 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5191 return build_aggr_init_full_exprs (decl, init, flags);
5192 else if (MAYBE_CLASS_TYPE_P (type))
5194 tree core_type = strip_array_types (type);
5196 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5197 error ("structure %qD with uninitialized const members", decl);
5198 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5199 error ("structure %qD with uninitialized reference members", decl);
5201 check_for_uninitialized_const_var (decl);
5204 check_for_uninitialized_const_var (decl);
5206 if (init && init != error_mark_node)
5207 init_code = build2 (INIT_EXPR, type, decl, init);
5212 /* If DECL is not a local variable, give it RTL. */
5215 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5217 int toplev = toplevel_bindings_p ();
5219 const char *filename;
5221 /* Set the DECL_ASSEMBLER_NAME for the object. */
5224 /* The `register' keyword, when used together with an
5225 asm-specification, indicates that the variable should be
5226 placed in a particular register. */
5227 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5229 set_user_assembler_name (decl, asmspec);
5230 DECL_HARD_REGISTER (decl) = 1;
5234 if (TREE_CODE (decl) == FUNCTION_DECL
5235 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5236 set_builtin_user_assembler_name (decl, asmspec);
5237 set_user_assembler_name (decl, asmspec);
5241 /* Handle non-variables up front. */
5242 if (TREE_CODE (decl) != VAR_DECL)
5244 rest_of_decl_compilation (decl, toplev, at_eof);
5248 /* If we see a class member here, it should be a static data
5250 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5252 gcc_assert (TREE_STATIC (decl));
5253 /* An in-class declaration of a static data member should be
5254 external; it is only a declaration, and not a definition. */
5255 if (init == NULL_TREE)
5256 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5259 /* We don't create any RTL for local variables. */
5260 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5263 /* We defer emission of local statics until the corresponding
5264 DECL_EXPR is expanded. */
5265 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5267 /* We try to defer namespace-scope static constants so that they are
5268 not emitted into the object file unnecessarily. */
5269 filename = input_filename;
5270 if (!DECL_VIRTUAL_P (decl)
5271 && TREE_READONLY (decl)
5272 && DECL_INITIAL (decl) != NULL_TREE
5273 && DECL_INITIAL (decl) != error_mark_node
5275 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5277 && !TREE_PUBLIC (decl))
5279 /* Fool with the linkage of static consts according to #pragma
5281 struct c_fileinfo *finfo = get_fileinfo (filename);
5282 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5284 TREE_PUBLIC (decl) = 1;
5285 DECL_EXTERNAL (decl) = finfo->interface_only;
5290 /* Likewise for template instantiations. */
5291 else if (DECL_LANG_SPECIFIC (decl)
5292 && DECL_IMPLICIT_INSTANTIATION (decl))
5295 /* If we're not deferring, go ahead and assemble the variable. */
5297 rest_of_decl_compilation (decl, toplev, at_eof);
5300 /* walk_tree helper for wrap_temporary_cleanups, below. */
5303 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5305 if (TYPE_P (*stmt_p))
5311 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5313 tree guard = (tree)data;
5314 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5316 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5317 /* Tell honor_protect_cleanup_actions to handle this as a separate
5319 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5321 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5327 /* We're initializing a local variable which has a cleanup GUARD. If there
5328 are any temporaries used in the initializer INIT of this variable, we
5329 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5330 variable will be cleaned up properly if one of them throws.
5332 Unfortunately, there's no way to express this properly in terms of
5333 nesting, as the regions for the temporaries overlap the region for the
5334 variable itself; if there are two temporaries, the variable needs to be
5335 the first thing destroyed if either of them throws. However, we only
5336 want to run the variable's cleanup if it actually got constructed. So
5337 we need to guard the temporary cleanups with the variable's cleanup if
5338 they are run on the normal path, but not if they are run on the
5339 exceptional path. We implement this by telling
5340 honor_protect_cleanup_actions to strip the variable cleanup from the
5341 exceptional path. */
5344 wrap_temporary_cleanups (tree init, tree guard)
5346 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5349 /* Generate code to initialize DECL (a local variable). */
5352 initialize_local_var (tree decl, tree init)
5354 tree type = TREE_TYPE (decl);
5358 gcc_assert (TREE_CODE (decl) == VAR_DECL
5359 || TREE_CODE (decl) == RESULT_DECL);
5360 gcc_assert (!TREE_STATIC (decl));
5362 if (DECL_SIZE (decl) == NULL_TREE)
5364 /* If we used it already as memory, it must stay in memory. */
5365 DECL_INITIAL (decl) = NULL_TREE;
5366 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5370 if (type == error_mark_node)
5373 /* Compute and store the initial value. */
5374 already_used = TREE_USED (decl) || TREE_USED (type);
5376 /* Generate a cleanup, if necessary. */
5377 cleanup = cxx_maybe_build_cleanup (decl);
5379 /* Perform the initialization. */
5382 int saved_stmts_are_full_exprs_p;
5384 /* If we're only initializing a single object, guard the destructors
5385 of any temporaries used in its initializer with its destructor.
5386 This isn't right for arrays because each element initialization is
5387 a full-expression. */
5388 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5389 wrap_temporary_cleanups (init, cleanup);
5391 gcc_assert (building_stmt_tree ());
5392 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5393 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5394 finish_expr_stmt (init);
5395 current_stmt_tree ()->stmts_are_full_exprs_p =
5396 saved_stmts_are_full_exprs_p;
5399 /* Set this to 0 so we can tell whether an aggregate which was
5400 initialized was ever used. Don't do this if it has a
5401 destructor, so we don't complain about the 'resource
5402 allocation is initialization' idiom. Now set
5403 attribute((unused)) on types so decls of that type will be
5404 marked used. (see TREE_USED, above.) */
5405 if (TYPE_NEEDS_CONSTRUCTING (type)
5407 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5408 && DECL_NAME (decl))
5409 TREE_USED (decl) = 0;
5410 else if (already_used)
5411 TREE_USED (decl) = 1;
5414 finish_decl_cleanup (decl, cleanup);
5417 /* DECL is a VAR_DECL for a compiler-generated variable with static
5418 storage duration (like a virtual table) whose initializer is a
5419 compile-time constant. INIT must be either a TREE_LIST of values,
5420 or a CONSTRUCTOR. Initialize the variable and provide it to the
5424 initialize_artificial_var (tree decl, tree init)
5426 gcc_assert (DECL_ARTIFICIAL (decl));
5427 if (TREE_CODE (init) == TREE_LIST)
5428 init = build_constructor_from_list (TREE_TYPE (decl), init);
5429 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5430 DECL_INITIAL (decl) = init;
5431 DECL_INITIALIZED_P (decl) = 1;
5432 determine_visibility (decl);
5433 layout_var_decl (decl);
5434 maybe_commonize_var (decl);
5435 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5438 /* INIT is the initializer for a variable, as represented by the
5439 parser. Returns true iff INIT is value-dependent. */
5442 value_dependent_init_p (tree init)
5444 if (TREE_CODE (init) == TREE_LIST)
5445 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5446 return any_value_dependent_elements_p (init);
5447 else if (TREE_CODE (init) == CONSTRUCTOR)
5448 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5450 VEC(constructor_elt, gc) *elts;
5454 elts = CONSTRUCTOR_ELTS (init);
5455 nelts = VEC_length (constructor_elt, elts);
5456 for (i = 0; i < nelts; ++i)
5457 if (value_dependent_init_p (VEC_index (constructor_elt,
5462 /* It must be a simple expression, e.g., int i = 3; */
5463 return value_dependent_expression_p (init);
5468 /* Finish processing of a declaration;
5469 install its line number and initial value.
5470 If the length of an array type is not known before,
5471 it must be determined now, from the initial value, or it is an error.
5473 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5474 true, then INIT is an integral constant expression.
5476 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5477 if the (init) syntax was used. */
5480 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5481 tree asmspec_tree, int flags)
5485 const char *asmspec = NULL;
5486 int was_readonly = 0;
5487 bool var_definition_p = false;
5488 int saved_processing_template_decl;
5491 if (decl == error_mark_node)
5496 error ("assignment (not initialization) in declaration");
5500 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5501 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5502 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5504 type = TREE_TYPE (decl);
5505 if (type == error_mark_node)
5508 /* Assume no cleanup is required. */
5509 cleanup = NULL_TREE;
5510 saved_processing_template_decl = processing_template_decl;
5512 /* If a name was specified, get the string. */
5513 if (global_scope_p (current_binding_level))
5514 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5515 if (asmspec_tree && asmspec_tree != error_mark_node)
5516 asmspec = TREE_STRING_POINTER (asmspec_tree);
5518 if (current_class_type
5519 && CP_DECL_CONTEXT (decl) == current_class_type
5520 && TYPE_BEING_DEFINED (current_class_type)
5521 && (DECL_INITIAL (decl) || init))
5522 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5524 auto_node = type_uses_auto (type);
5527 if (init == NULL_TREE)
5529 error ("declaration of %q#D has no initializer", decl);
5530 TREE_TYPE (decl) = error_mark_node;
5533 else if (describable_type (init))
5535 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5536 if (type == error_mark_node)
5541 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5543 if (init == ridpointers[(int)RID_DELETE])
5545 /* FIXME check this is 1st decl. */
5546 DECL_DELETED_FN (decl) = 1;
5547 DECL_DECLARED_INLINE_P (decl) = 1;
5548 DECL_INITIAL (decl) = error_mark_node;
5551 else if (init == ridpointers[(int)RID_DEFAULT])
5553 if (!defaultable_fn_p (decl))
5555 error ("%qD cannot be defaulted", decl);
5556 DECL_INITIAL (decl) = NULL_TREE;
5559 DECL_DEFAULTED_FN (decl) = 1;
5563 if (processing_template_decl)
5565 bool type_dependent_p;
5567 /* Add this declaration to the statement-tree. */
5568 if (at_function_scope_p ())
5569 add_decl_expr (decl);
5571 type_dependent_p = dependent_type_p (type);
5573 if (check_for_bare_parameter_packs (init))
5576 DECL_INITIAL (decl) = NULL_TREE;
5579 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5581 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5582 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5583 TREE_CONSTANT (decl) = 1;
5586 /* Generally, initializers in templates are expanded when the
5587 template is instantiated. But, if DECL is an integral
5588 constant static data member, then it can be used in future
5589 integral constant expressions, and its value must be
5592 && DECL_CLASS_SCOPE_P (decl)
5593 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5594 && !type_dependent_p
5595 && !value_dependent_init_p (init)))
5598 DECL_INITIAL (decl) = init;
5599 if (TREE_CODE (decl) == VAR_DECL
5600 && !DECL_PRETTY_FUNCTION_P (decl)
5601 && !type_dependent_p)
5602 maybe_deduce_size_from_array_init (decl, init);
5606 if (TREE_CODE (init) == TREE_LIST)
5608 /* If the parenthesized-initializer form was used (e.g.,
5609 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5610 arguments. (There is generally only one.) We convert them
5613 for (; list; list = TREE_CHAIN (list))
5615 tree elt = TREE_VALUE (list);
5616 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5620 init = fold_non_dependent_expr (init);
5621 processing_template_decl = 0;
5624 /* Take care of TYPE_DECLs up front. */
5625 if (TREE_CODE (decl) == TYPE_DECL)
5627 if (type != error_mark_node
5628 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5630 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5631 warning (0, "shadowing previous type declaration of %q#D", decl);
5632 set_identifier_type_value (DECL_NAME (decl), decl);
5635 /* If we have installed this as the canonical typedef for this
5636 type, and that type has not been defined yet, delay emitting
5637 the debug information for it, as we will emit it later. */
5638 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5639 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5640 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5642 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5647 /* A reference will be modified here, as it is initialized. */
5648 if (! DECL_EXTERNAL (decl)
5649 && TREE_READONLY (decl)
5650 && TREE_CODE (type) == REFERENCE_TYPE)
5653 TREE_READONLY (decl) = 0;
5656 if (TREE_CODE (decl) == VAR_DECL)
5658 /* Only PODs can have thread-local storage. Other types may require
5659 various kinds of non-trivial initialization. */
5660 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5661 error ("%qD cannot be thread-local because it has non-POD type %qT",
5662 decl, TREE_TYPE (decl));
5663 /* If this is a local variable that will need a mangled name,
5664 register it now. We must do this before processing the
5665 initializer for the variable, since the initialization might
5666 require a guard variable, and since the mangled name of the
5667 guard variable will depend on the mangled name of this
5669 if (DECL_FUNCTION_SCOPE_P (decl)
5670 && TREE_STATIC (decl)
5671 && !DECL_ARTIFICIAL (decl))
5672 push_local_name (decl);
5673 /* Convert the initializer to the type of DECL, if we have not
5674 already initialized DECL. */
5675 if (!DECL_INITIALIZED_P (decl)
5676 /* If !DECL_EXTERNAL then DECL is being defined. In the
5677 case of a static data member initialized inside the
5678 class-specifier, there can be an initializer even if DECL
5679 is *not* defined. */
5680 && (!DECL_EXTERNAL (decl) || init))
5682 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5685 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5686 /* Allow libjava/prims.cc define primitive classes. */
5687 if (init != NULL_TREE
5688 || jclass == NULL_TREE
5689 || TREE_CODE (jclass) != TYPE_DECL
5690 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5691 || !same_type_ignoring_top_level_qualifiers_p
5692 (type, TREE_TYPE (TREE_TYPE (jclass))))
5693 error ("Java object %qD not allocated with %<new%>", decl);
5698 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5699 if (init_const_expr_p)
5701 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5702 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5703 TREE_CONSTANT (decl) = 1;
5706 init = check_initializer (decl, init, flags, &cleanup);
5707 /* Thread-local storage cannot be dynamically initialized. */
5708 if (DECL_THREAD_LOCAL_P (decl) && init)
5710 error ("%qD is thread-local and so cannot be dynamically "
5711 "initialized", decl);
5715 /* Check that the initializer for a static data member was a
5716 constant. Although we check in the parser that the
5717 initializer is an integral constant expression, we do not
5718 simplify division-by-zero at the point at which it
5719 occurs. Therefore, in:
5721 struct S { static const int i = 7 / 0; };
5723 we issue an error at this point. It would
5724 probably be better to forbid division by zero in
5725 integral constant expressions. */
5726 if (DECL_EXTERNAL (decl) && init)
5728 error ("%qD cannot be initialized by a non-constant expression"
5729 " when being declared", decl);
5730 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5738 The memory occupied by any object of static storage
5739 duration is zero-initialized at program startup before
5740 any other initialization takes place.
5742 We cannot create an appropriate initializer until after
5743 the type of DECL is finalized. If DECL_INITIAL is set,
5744 then the DECL is statically initialized, and any
5745 necessary zero-initialization has already been performed. */
5746 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5747 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5748 /*nelts=*/NULL_TREE,
5749 /*static_storage_p=*/true);
5750 /* Remember that the initialization for this variable has
5752 DECL_INITIALIZED_P (decl) = 1;
5753 /* This declaration is the definition of this variable,
5754 unless we are initializing a static data member within
5755 the class specifier. */
5756 if (!DECL_EXTERNAL (decl))
5757 var_definition_p = true;
5759 /* If the variable has an array type, lay out the type, even if
5760 there is no initializer. It is valid to index through the
5761 array, and we must get TYPE_ALIGN set correctly on the array
5763 else if (TREE_CODE (type) == ARRAY_TYPE)
5766 else if (TREE_CODE (decl) == FIELD_DECL
5767 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5768 error ("non-static data member %qD has Java class type", decl);
5770 /* Add this declaration to the statement-tree. This needs to happen
5771 after the call to check_initializer so that the DECL_EXPR for a
5772 reference temp is added before the DECL_EXPR for the reference itself. */
5773 if (at_function_scope_p ())
5774 add_decl_expr (decl);
5776 /* Let the middle end know about variables and functions -- but not
5777 static data members in uninstantiated class templates. */
5778 if (!saved_processing_template_decl
5779 && (TREE_CODE (decl) == VAR_DECL
5780 || TREE_CODE (decl) == FUNCTION_DECL))
5782 if (TREE_CODE (decl) == VAR_DECL)
5784 layout_var_decl (decl);
5785 maybe_commonize_var (decl);
5788 /* This needs to happen after the linkage is set. */
5789 determine_visibility (decl);
5791 if (var_definition_p && TREE_STATIC (decl))
5793 /* If a TREE_READONLY variable needs initialization
5794 at runtime, it is no longer readonly and we need to
5795 avoid MEM_READONLY_P being set on RTL created for it. */
5798 if (TREE_READONLY (decl))
5799 TREE_READONLY (decl) = 0;
5802 else if (was_readonly)
5803 TREE_READONLY (decl) = 1;
5806 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5808 /* Check for abstractness of the type. Notice that there is no
5809 need to strip array types here since the check for those types
5810 is already done within create_array_type_for_decl. */
5811 if (TREE_CODE (type) == FUNCTION_TYPE
5812 || TREE_CODE (type) == METHOD_TYPE)
5813 abstract_virtuals_error (decl, TREE_TYPE (type));
5815 abstract_virtuals_error (decl, type);
5817 if (TREE_TYPE (decl) == error_mark_node)
5818 /* No initialization required. */
5820 else if (TREE_CODE (decl) == FUNCTION_DECL)
5824 if (init == ridpointers[(int)RID_DEFAULT])
5826 /* An out-of-class default definition is defined at
5827 the point where it is explicitly defaulted. */
5828 if (DECL_INITIAL (decl) == error_mark_node)
5829 synthesize_method (decl);
5832 error ("function %q#D is initialized like a variable", decl);
5834 /* else no initialization required. */
5836 else if (DECL_EXTERNAL (decl)
5837 && ! (DECL_LANG_SPECIFIC (decl)
5838 && DECL_NOT_REALLY_EXTERN (decl)))
5841 DECL_INITIAL (decl) = init;
5843 /* A variable definition. */
5844 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5845 /* Initialize the local variable. */
5846 initialize_local_var (decl, init);
5848 /* If a variable is defined, and then a subsequent
5849 definition with external linkage is encountered, we will
5850 get here twice for the same variable. We want to avoid
5851 calling expand_static_init more than once. For variables
5852 that are not static data members, we can call
5853 expand_static_init only when we actually process the
5854 initializer. It is not legal to redeclare a static data
5855 member, so this issue does not arise in that case. */
5856 else if (var_definition_p && TREE_STATIC (decl))
5857 expand_static_init (decl, init);
5860 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5861 reference, insert it in the statement-tree now. */
5863 push_cleanup (decl, cleanup, false);
5866 processing_template_decl = saved_processing_template_decl;
5869 TREE_READONLY (decl) = 1;
5871 /* If this was marked 'used', be sure it will be output. */
5872 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5873 mark_decl_referenced (decl);
5876 /* This is here for a midend callback from c-common.c. */
5879 finish_decl (tree decl, tree init, tree asmspec_tree)
5881 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5884 /* Returns a declaration for a VAR_DECL as if:
5886 extern "C" TYPE NAME;
5888 had been seen. Used to create compiler-generated global
5892 declare_global_var (tree name, tree type)
5896 push_to_top_level ();
5897 decl = build_decl (VAR_DECL, name, type);
5898 TREE_PUBLIC (decl) = 1;
5899 DECL_EXTERNAL (decl) = 1;
5900 DECL_ARTIFICIAL (decl) = 1;
5901 /* If the user has explicitly declared this variable (perhaps
5902 because the code we are compiling is part of a low-level runtime
5903 library), then it is possible that our declaration will be merged
5904 with theirs by pushdecl. */
5905 decl = pushdecl (decl);
5906 finish_decl (decl, NULL_TREE, NULL_TREE);
5907 pop_from_top_level ();
5912 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5913 if "__cxa_atexit" is not being used) corresponding to the function
5914 to be called when the program exits. */
5917 get_atexit_fn_ptr_type (void)
5922 if (!atexit_fn_ptr_type_node)
5924 if (flag_use_cxa_atexit
5925 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5926 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5927 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5929 /* The parameter to "atexit" is "void (*)(void)". */
5930 arg_types = void_list_node;
5932 fn_type = build_function_type (void_type_node, arg_types);
5933 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5936 return atexit_fn_ptr_type_node;
5939 /* Returns a pointer to the `atexit' function. Note that if
5940 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5941 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5944 get_atexit_node (void)
5951 bool use_aeabi_atexit;
5956 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5958 /* The declaration for `__cxa_atexit' is:
5960 int __cxa_atexit (void (*)(void *), void *, void *)
5962 We build up the argument types and then then function type
5965 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5966 /* First, build the pointer-to-function type for the first
5968 fn_ptr_type = get_atexit_fn_ptr_type ();
5969 /* Then, build the rest of the argument types. */
5970 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5971 if (use_aeabi_atexit)
5973 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5974 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5978 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5979 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5981 /* And the final __cxa_atexit type. */
5982 fn_type = build_function_type (integer_type_node, arg_types);
5983 fn_ptr_type = build_pointer_type (fn_type);
5984 if (use_aeabi_atexit)
5985 name = "__aeabi_atexit";
5987 name = "__cxa_atexit";
5991 /* The declaration for `atexit' is:
5993 int atexit (void (*)());
5995 We build up the argument types and then then function type
5997 fn_ptr_type = get_atexit_fn_ptr_type ();
5998 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5999 /* Build the final atexit type. */
6000 fn_type = build_function_type (integer_type_node, arg_types);
6004 /* Now, build the function declaration. */
6005 push_lang_context (lang_name_c);
6006 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6007 mark_used (atexit_fndecl);
6008 pop_lang_context ();
6009 atexit_node = decay_conversion (atexit_fndecl);
6014 /* Returns the __dso_handle VAR_DECL. */
6017 get_dso_handle_node (void)
6019 if (dso_handle_node)
6020 return dso_handle_node;
6022 /* Declare the variable. */
6023 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6026 return dso_handle_node;
6029 /* Begin a new function with internal linkage whose job will be simply
6030 to destroy some particular variable. */
6032 static GTY(()) int start_cleanup_cnt;
6035 start_cleanup_fn (void)
6040 bool use_cxa_atexit = flag_use_cxa_atexit
6041 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6043 push_to_top_level ();
6045 /* No need to mangle this. */
6046 push_lang_context (lang_name_c);
6048 /* Build the name of the function. */
6049 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6050 /* Build the function declaration. */
6051 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6052 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6053 /* It's a function with internal linkage, generated by the
6055 TREE_PUBLIC (fndecl) = 0;
6056 DECL_ARTIFICIAL (fndecl) = 1;
6057 /* Make the function `inline' so that it is only emitted if it is
6058 actually needed. It is unlikely that it will be inlined, since
6059 it is only called via a function pointer, but we avoid unnecessary
6060 emissions this way. */
6061 DECL_DECLARED_INLINE_P (fndecl) = 1;
6062 DECL_INTERFACE_KNOWN (fndecl) = 1;
6063 /* Build the parameter. */
6068 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6069 DECL_CONTEXT (parmdecl) = fndecl;
6070 TREE_USED (parmdecl) = 1;
6071 DECL_ARGUMENTS (fndecl) = parmdecl;
6075 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6077 pop_lang_context ();
6079 return current_function_decl;
6082 /* Finish the cleanup function begun by start_cleanup_fn. */
6085 end_cleanup_fn (void)
6087 expand_or_defer_fn (finish_function (0));
6089 pop_from_top_level ();
6092 /* Generate code to handle the destruction of DECL, an object with
6093 static storage duration. */
6096 register_dtor_fn (tree decl)
6105 type = TREE_TYPE (decl);
6106 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6107 return void_zero_node;
6109 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6110 a class object, we can just pass the destructor to
6111 "__cxa_atexit"; we don't have to build a temporary function to do
6113 use_dtor = (flag_use_cxa_atexit
6114 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6115 && CLASS_TYPE_P (type));
6120 /* Find the destructor. */
6121 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6122 gcc_assert (idx >= 0);
6123 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6124 /* Make sure it is accessible. */
6125 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6129 /* Call build_cleanup before we enter the anonymous function so
6130 that any access checks will be done relative to the current
6131 scope, rather than the scope of the anonymous function. */
6132 build_cleanup (decl);
6134 /* Now start the function. */
6135 cleanup = start_cleanup_fn ();
6137 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6138 to the original function, rather than the anonymous one. That
6139 will make the back end think that nested functions are in use,
6140 which causes confusion. */
6141 push_deferring_access_checks (dk_no_check);
6142 fcall = build_cleanup (decl);
6143 pop_deferring_access_checks ();
6145 /* Create the body of the anonymous function. */
6146 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6147 finish_expr_stmt (fcall);
6148 finish_compound_stmt (compound_stmt);
6152 /* Call atexit with the cleanup function. */
6153 mark_used (cleanup);
6154 cleanup = build_address (cleanup);
6155 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6161 /* We must convert CLEANUP to the type that "__cxa_atexit"
6163 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6164 /* "__cxa_atexit" will pass the address of DECL to the
6165 cleanup function. */
6167 addr = build_address (decl);
6168 /* The declared type of the parameter to "__cxa_atexit" is
6169 "void *". For plain "T*", we could just let the
6170 machinery in cp_build_function_call convert it -- but if the
6171 type is "cv-qualified T *", then we need to convert it
6172 before passing it in, to avoid spurious errors. */
6173 addr = build_nop (ptr_type_node, addr);
6176 /* Since the cleanup functions we build ignore the address
6177 they're given, there's no reason to pass the actual address
6178 in, and, in general, it's cheaper to pass NULL than any
6180 addr = null_pointer_node;
6181 args = tree_cons (NULL_TREE,
6182 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6183 tf_warning_or_error),
6185 if (targetm.cxx.use_aeabi_atexit ())
6187 args = tree_cons (NULL_TREE, cleanup, args);
6188 args = tree_cons (NULL_TREE, addr, args);
6192 args = tree_cons (NULL_TREE, addr, args);
6193 args = tree_cons (NULL_TREE, cleanup, args);
6197 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6198 return cp_build_function_call (get_atexit_node (), args,
6199 tf_warning_or_error);
6202 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6203 is its initializer. Generate code to handle the construction
6204 and destruction of DECL. */
6207 expand_static_init (tree decl, tree init)
6209 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6210 gcc_assert (TREE_STATIC (decl));
6212 /* Some variables require no initialization. */
6214 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6215 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6218 if (DECL_FUNCTION_SCOPE_P (decl))
6220 /* Emit code to perform this initialization but once. */
6221 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6222 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6223 tree guard, guard_addr;
6224 tree acquire_fn, release_fn, abort_fn;
6227 /* Emit code to perform this initialization but once. This code
6230 static <type> guard;
6231 if (!guard.first_byte) {
6232 if (__cxa_guard_acquire (&guard)) {
6235 // Do initialization.
6236 flag = true; __cxa_guard_release (&guard);
6237 // Register variable for destruction at end of program.
6239 if (!flag) __cxa_guard_abort (&guard);
6243 Note that the `flag' variable is only set to 1 *after* the
6244 initialization is complete. This ensures that an exception,
6245 thrown during the construction, will cause the variable to
6246 reinitialized when we pass through this code again, as per:
6250 If the initialization exits by throwing an exception, the
6251 initialization is not complete, so it will be tried again
6252 the next time control enters the declaration.
6254 This process should be thread-safe, too; multiple threads
6255 should not be able to initialize the variable more than
6258 /* Create the guard variable. */
6259 guard = get_guard (decl);
6261 /* This optimization isn't safe on targets with relaxed memory
6262 consistency. On such targets we force synchronization in
6263 __cxa_guard_acquire. */
6264 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6266 /* Begin the conditional initialization. */
6267 if_stmt = begin_if_stmt ();
6268 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6269 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6272 if (flag_threadsafe_statics)
6274 guard_addr = build_address (guard);
6276 acquire_fn = get_identifier ("__cxa_guard_acquire");
6277 release_fn = get_identifier ("__cxa_guard_release");
6278 abort_fn = get_identifier ("__cxa_guard_abort");
6279 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6281 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6283 tree vfntype = build_function_type (void_type_node, argtypes);
6284 acquire_fn = push_library_fn
6285 (acquire_fn, build_function_type (integer_type_node, argtypes),
6287 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6288 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6292 release_fn = identifier_global_value (release_fn);
6293 abort_fn = identifier_global_value (abort_fn);
6296 inner_if_stmt = begin_if_stmt ();
6297 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6300 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6301 begin = get_target_expr (boolean_false_node);
6302 flag = TARGET_EXPR_SLOT (begin);
6304 TARGET_EXPR_CLEANUP (begin)
6305 = build3 (COND_EXPR, void_type_node, flag,
6307 build_call_n (abort_fn, 1, guard_addr));
6308 CLEANUP_EH_ONLY (begin) = 1;
6310 /* Do the initialization itself. */
6311 init = add_stmt_to_compound (begin, init);
6312 init = add_stmt_to_compound
6313 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6314 init = add_stmt_to_compound
6315 (init, build_call_n (release_fn, 1, guard_addr));
6318 init = add_stmt_to_compound (init, set_guard (guard));
6320 /* Use atexit to register a function for destroying this static
6322 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6324 finish_expr_stmt (init);
6326 if (flag_threadsafe_statics)
6328 finish_compound_stmt (inner_then_clause);
6329 finish_then_clause (inner_if_stmt);
6330 finish_if_stmt (inner_if_stmt);
6333 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6335 finish_compound_stmt (then_clause);
6336 finish_then_clause (if_stmt);
6337 finish_if_stmt (if_stmt);
6341 static_aggregates = tree_cons (init, decl, static_aggregates);
6345 /* Make TYPE a complete type based on INITIAL_VALUE.
6346 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6347 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6348 3 if the initializer list is empty (in pedantic mode). */
6351 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6354 tree type, elt_type;
6358 unsigned HOST_WIDE_INT i;
6361 /* An array of character type can be initialized from a
6362 brace-enclosed string constant.
6364 FIXME: this code is duplicated from reshape_init. Probably
6365 we should just call reshape_init here? */
6366 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6367 && TREE_CODE (initial_value) == CONSTRUCTOR
6368 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6370 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6371 tree value = VEC_index (constructor_elt, v, 0)->value;
6373 if (TREE_CODE (value) == STRING_CST
6374 && VEC_length (constructor_elt, v) == 1)
6375 initial_value = value;
6378 /* If any of the elements are parameter packs, we can't actually
6379 complete this type now because the array size is dependent. */
6380 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6382 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6385 if (PACK_EXPANSION_P (value))
6391 failure = complete_array_type (ptype, initial_value, do_default);
6393 /* We can create the array before the element type is complete, which
6394 means that we didn't have these two bits set in the original type
6395 either. In completing the type, we are expected to propagate these
6396 bits. See also complete_type which does the same thing for arrays
6399 if (TYPE_DOMAIN (type))
6401 elt_type = TREE_TYPE (type);
6402 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6403 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6404 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6410 /* Return zero if something is declared to be a member of type
6411 CTYPE when in the context of CUR_TYPE. STRING is the error
6412 message to print in that case. Otherwise, quietly return 1. */
6415 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6417 if (ctype && ctype != cur_type)
6419 if (flags == DTOR_FLAG)
6420 error ("destructor for alien class %qT cannot be a member", ctype);
6422 error ("constructor for alien class %qT cannot be a member", ctype);
6428 /* Subroutine of `grokdeclarator'. */
6430 /* Generate errors possibly applicable for a given set of specifiers.
6431 This is for ARM $7.1.2. */
6434 bad_specifiers (tree object,
6443 error ("%qD declared as a %<virtual%> %s", object, type);
6445 error ("%qD declared as an %<inline%> %s", object, type);
6447 error ("%<const%> and %<volatile%> function specifiers on "
6448 "%qD invalid in %s declaration",
6451 error ("%q+D declared as a friend", object);
6453 && (TREE_CODE (object) == TYPE_DECL
6454 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6455 && !TYPE_REFFN_P (TREE_TYPE (object))
6456 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6457 error ("%q+D declared with an exception specification", object);
6460 /* DECL is a member function or static data member and is presently
6461 being defined. Check that the definition is taking place in a
6465 check_class_member_definition_namespace (tree decl)
6467 /* These checks only apply to member functions and static data
6469 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6470 || TREE_CODE (decl) == VAR_DECL);
6471 /* We check for problems with specializations in pt.c in
6472 check_specialization_namespace, where we can issue better
6474 if (processing_specialization)
6476 /* There are no restrictions on the placement of
6477 explicit instantiations. */
6478 if (processing_explicit_instantiation)
6482 A member function definition that appears outside of the
6483 class definition shall appear in a namespace scope enclosing
6484 the class definition.
6488 The definition for a static data member shall appear in a
6489 namespace scope enclosing the member's class definition. */
6490 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6491 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6492 decl, DECL_CONTEXT (decl));
6495 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6496 METHOD_TYPE for a non-static member function; QUALS are the
6497 cv-qualifiers that apply to the function. */
6500 build_this_parm (tree type, cp_cv_quals quals)
6505 cp_cv_quals this_quals;
6507 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6508 /* The `this' parameter is implicitly `const'; it cannot be
6510 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6511 qual_type = cp_build_qualified_type (this_type, this_quals);
6512 parm = build_artificial_parm (this_identifier, qual_type);
6513 cp_apply_type_quals_to_decl (this_quals, parm);
6517 /* CTYPE is class type, or null if non-class.
6518 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6520 DECLARATOR is the function's name.
6521 PARMS is a chain of PARM_DECLs for the function.
6522 VIRTUALP is truthvalue of whether the function is virtual or not.
6523 FLAGS are to be passed through to `grokclassfn'.
6524 QUALS are qualifiers indicating whether the function is `const'
6526 RAISES is a list of exceptions that this function can raise.
6527 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6528 not look, and -1 if we should not call `grokclassfn' at all.
6530 SFK is the kind of special function (if any) for the new function.
6532 Returns `NULL_TREE' if something goes wrong, after issuing
6533 applicable error messages. */
6536 grokfndecl (tree ctype,
6540 tree orig_declarator,
6542 enum overload_flags flags,
6549 special_function_kind sfk,
6554 location_t location)
6557 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6561 type = build_exception_variant (type, raises);
6563 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6565 /* If we have an explicit location, use it, otherwise use whatever
6566 build_lang_decl used (probably input_location). */
6567 if (location != UNKNOWN_LOCATION)
6568 DECL_SOURCE_LOCATION (decl) = location;
6570 if (TREE_CODE (type) == METHOD_TYPE)
6573 parm = build_this_parm (type, quals);
6574 TREE_CHAIN (parm) = parms;
6577 DECL_ARGUMENTS (decl) = parms;
6578 for (t = parms; t; t = TREE_CHAIN (t))
6579 DECL_CONTEXT (t) = decl;
6580 /* Propagate volatile out from type to decl. */
6581 if (TYPE_VOLATILE (type))
6582 TREE_THIS_VOLATILE (decl) = 1;
6584 /* Setup decl according to sfk. */
6587 case sfk_constructor:
6588 case sfk_copy_constructor:
6589 DECL_CONSTRUCTOR_P (decl) = 1;
6591 case sfk_destructor:
6592 DECL_DESTRUCTOR_P (decl) = 1;
6598 /* If pointers to member functions use the least significant bit to
6599 indicate whether a function is virtual, ensure a pointer
6600 to this function will have that bit clear. */
6601 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6602 && TREE_CODE (type) == METHOD_TYPE
6603 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6604 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6607 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6611 ("defining explicit specialization %qD in friend declaration",
6615 tree fns = TREE_OPERAND (orig_declarator, 0);
6616 tree args = TREE_OPERAND (orig_declarator, 1);
6618 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6620 /* Something like `template <class T> friend void f<T>()'. */
6621 error ("invalid use of template-id %qD in declaration "
6622 "of primary template",
6628 /* A friend declaration of the form friend void f<>(). Record
6629 the information in the TEMPLATE_ID_EXPR. */
6630 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6632 if (TREE_CODE (fns) == COMPONENT_REF)
6634 /* Due to bison parser ickiness, we will have already looked
6635 up an operator_name or PFUNCNAME within the current class
6636 (see template_id in parse.y). If the current class contains
6637 such a name, we'll get a COMPONENT_REF here. Undo that. */
6639 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6640 == current_class_type);
6641 fns = TREE_OPERAND (fns, 1);
6643 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6644 || TREE_CODE (fns) == OVERLOAD);
6645 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6647 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6648 if (TREE_PURPOSE (t)
6649 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6651 error ("default arguments are not allowed in declaration "
6652 "of friend template specialization %qD",
6659 error ("%<inline%> is not allowed in declaration of friend "
6660 "template specialization %qD",
6667 /* If this decl has namespace scope, set that up. */
6669 set_decl_namespace (decl, in_namespace, friendp);
6671 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6673 /* `main' and builtins have implicit 'C' linkage. */
6674 if ((MAIN_NAME_P (declarator)
6675 || (IDENTIFIER_LENGTH (declarator) > 10
6676 && IDENTIFIER_POINTER (declarator)[0] == '_'
6677 && IDENTIFIER_POINTER (declarator)[1] == '_'
6678 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6679 && current_lang_name == lang_name_cplusplus
6680 && ctype == NULL_TREE
6681 /* NULL_TREE means global namespace. */
6682 && DECL_CONTEXT (decl) == NULL_TREE)
6683 SET_DECL_LANGUAGE (decl, lang_c);
6685 /* Should probably propagate const out from type to decl I bet (mrs). */
6688 DECL_STATIC_FUNCTION_P (decl) = 1;
6689 DECL_CONTEXT (decl) = ctype;
6694 DECL_CONTEXT (decl) = ctype;
6696 check_class_member_definition_namespace (decl);
6699 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6701 if (processing_template_decl)
6702 error ("cannot declare %<::main%> to be a template");
6704 error ("cannot declare %<::main%> to be inline");
6706 error ("cannot declare %<::main%> to be static");
6711 /* Members of anonymous types and local classes have no linkage; make
6712 them internal. If a typedef is made later, this will be changed. */
6713 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6714 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6719 /* [basic.link]: A name with no linkage (notably, the name of a class
6720 or enumeration declared in a local scope) shall not be used to
6721 declare an entity with linkage.
6723 Only check this for public decls for now. See core 319, 389. */
6724 t = no_linkage_check (TREE_TYPE (decl),
6725 /*relaxed_p=*/false);
6728 if (TYPE_ANONYMOUS_P (t))
6730 if (DECL_EXTERN_C_P (decl))
6731 /* Allow this; it's pretty common in C. */;
6734 permerror (input_location, "non-local function %q#D uses anonymous type",
6736 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6737 permerror (input_location, "%q+#D does not refer to the unqualified "
6738 "type, so it is not used for linkage",
6743 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6747 TREE_PUBLIC (decl) = publicp;
6750 DECL_INTERFACE_KNOWN (decl) = 1;
6751 DECL_NOT_REALLY_EXTERN (decl) = 1;
6754 /* If the declaration was declared inline, mark it as such. */
6756 DECL_DECLARED_INLINE_P (decl) = 1;
6758 DECL_EXTERNAL (decl) = 1;
6759 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6762 ? G_("static member function %qD cannot have cv-qualifier")
6763 : G_("non-member function %qD cannot have cv-qualifier"),
6765 quals = TYPE_UNQUALIFIED;
6768 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6769 && !grok_op_properties (decl, /*complain=*/true))
6772 if (ctype && decl_function_context (decl))
6773 DECL_NO_STATIC_CHAIN (decl) = 1;
6776 /* Make the init_value nonzero so pushdecl knows this is not
6777 tentative. error_mark_node is replaced later with the BLOCK. */
6778 DECL_INITIAL (decl) = error_mark_node;
6780 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6781 TREE_NOTHROW (decl) = 1;
6783 /* Caller will do the rest of this. */
6787 if (ctype != NULL_TREE)
6788 grokclassfn (ctype, decl, flags);
6790 decl = check_explicit_specialization (orig_declarator, decl,
6793 4 * (friendp != 0));
6794 if (decl == error_mark_node)
6799 cplus_decl_attributes (&decl, *attrlist, 0);
6800 *attrlist = NULL_TREE;
6803 /* Check main's type after attributes have been applied. */
6804 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6806 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6809 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6811 error ("%<::main%> must return %<int%>");
6812 newtype = build_function_type (integer_type_node, oldtypeargs);
6813 TREE_TYPE (decl) = newtype;
6816 check_main_parameter_types (decl);
6819 if (ctype != NULL_TREE
6820 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6823 tree old_decl = check_classfn (ctype, decl,
6824 (processing_template_decl
6825 > template_class_depth (ctype))
6826 ? current_template_parms
6829 if (old_decl == error_mark_node)
6837 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6838 /* Because grokfndecl is always supposed to return a
6839 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6840 here. We depend on our callers to figure out that its
6841 really a template that's being returned. */
6842 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6844 if (DECL_STATIC_FUNCTION_P (old_decl)
6845 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6846 /* Remove the `this' parm added by grokclassfn.
6847 XXX Isn't this done in start_function, too? */
6848 revert_static_member_fn (decl);
6849 if (DECL_ARTIFICIAL (old_decl))
6851 error ("definition of implicitly-declared %qD", old_decl);
6855 /* Since we've smashed OLD_DECL to its
6856 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6857 if (TREE_CODE (decl) == TEMPLATE_DECL)
6858 decl = DECL_TEMPLATE_RESULT (decl);
6860 /* Attempt to merge the declarations. This can fail, in
6861 the case of some invalid specialization declarations. */
6862 pushed_scope = push_scope (ctype);
6863 ok = duplicate_decls (decl, old_decl, friendp);
6865 pop_scope (pushed_scope);
6868 error ("no %q#D member function declared in class %qT",
6876 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6879 if (ctype == NULL_TREE || check)
6883 DECL_VIRTUAL_P (decl) = 1;
6888 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6889 the linkage that DECL will receive in the object file. */
6892 set_linkage_for_static_data_member (tree decl)
6894 /* A static data member always has static storage duration and
6895 external linkage. Note that static data members are forbidden in
6896 local classes -- the only situation in which a class has
6897 non-external linkage. */
6898 TREE_PUBLIC (decl) = 1;
6899 TREE_STATIC (decl) = 1;
6900 /* For non-template classes, static data members are always put
6901 out in exactly those files where they are defined, just as
6902 with ordinary namespace-scope variables. */
6903 if (!processing_template_decl)
6904 DECL_INTERFACE_KNOWN (decl) = 1;
6907 /* Create a VAR_DECL named NAME with the indicated TYPE.
6909 If SCOPE is non-NULL, it is the class type or namespace containing
6910 the variable. If SCOPE is NULL, the variable should is created in
6911 the innermost enclosings scope. */
6914 grokvardecl (tree type,
6916 const cp_decl_specifier_seq *declspecs,
6922 tree explicit_scope;
6924 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6926 /* Compute the scope in which to place the variable, but remember
6927 whether or not that scope was explicitly specified by the user. */
6928 explicit_scope = scope;
6931 /* An explicit "extern" specifier indicates a namespace-scope
6933 if (declspecs->storage_class == sc_extern)
6934 scope = current_namespace;
6935 else if (!at_function_scope_p ())
6936 scope = current_scope ();
6940 && (/* If the variable is a namespace-scope variable declared in a
6941 template, we need DECL_LANG_SPECIFIC. */
6942 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6943 /* Similarly for namespace-scope variables with language linkage
6945 || (TREE_CODE (scope) == NAMESPACE_DECL
6946 && current_lang_name != lang_name_cplusplus)
6947 /* Similarly for static data members. */
6949 decl = build_lang_decl (VAR_DECL, name, type);
6951 decl = build_decl (VAR_DECL, name, type);
6953 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6954 set_decl_namespace (decl, explicit_scope, 0);
6956 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6958 if (declspecs->storage_class == sc_extern)
6960 DECL_THIS_EXTERN (decl) = 1;
6961 DECL_EXTERNAL (decl) = !initialized;
6964 if (DECL_CLASS_SCOPE_P (decl))
6966 set_linkage_for_static_data_member (decl);
6967 /* This function is only called with out-of-class definitions. */
6968 DECL_EXTERNAL (decl) = 0;
6969 check_class_member_definition_namespace (decl);
6971 /* At top level, either `static' or no s.c. makes a definition
6972 (perhaps tentative), and absence of `static' makes it public. */
6973 else if (toplevel_bindings_p ())
6975 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6976 && (DECL_THIS_EXTERN (decl) || ! constp));
6977 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6979 /* Not at top level, only `static' makes a static definition. */
6982 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6983 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6986 if (declspecs->specs[(int)ds_thread])
6987 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6989 if (TREE_PUBLIC (decl))
6991 /* [basic.link]: A name with no linkage (notably, the name of a class
6992 or enumeration declared in a local scope) shall not be used to
6993 declare an entity with linkage.
6995 Only check this for public decls for now. */
6996 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6999 if (TYPE_ANONYMOUS_P (t))
7001 if (DECL_EXTERN_C_P (decl))
7002 /* Allow this; it's pretty common in C. */
7006 /* DRs 132, 319 and 389 seem to indicate types with
7007 no linkage can only be used to declare extern "C"
7008 entities. Since it's not always an error in the
7009 ISO C++ 90 Standard, we only issue a warning. */
7010 warning (0, "non-local variable %q#D uses anonymous type",
7012 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7013 warning (0, "%q+#D does not refer to the unqualified "
7014 "type, so it is not used for linkage",
7019 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
7023 DECL_INTERFACE_KNOWN (decl) = 1;
7028 /* Create and return a canonical pointer to member function type, for
7029 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7032 build_ptrmemfunc_type (tree type)
7036 tree unqualified_variant = NULL_TREE;
7038 if (type == error_mark_node)
7041 /* If a canonical type already exists for this type, use it. We use
7042 this method instead of type_hash_canon, because it only does a
7043 simple equality check on the list of field members. */
7045 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7048 /* Make sure that we always have the unqualified pointer-to-member
7050 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7052 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7054 t = make_class_type (RECORD_TYPE);
7055 xref_basetypes (t, NULL_TREE);
7057 /* Let the front end know this is a pointer to member function... */
7058 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7059 /* ... and not really a class type. */
7060 SET_CLASS_TYPE_P (t, 0);
7062 field = build_decl (FIELD_DECL, pfn_identifier, type);
7065 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
7066 TREE_CHAIN (field) = fields;
7069 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7071 /* Zap out the name so that the back end will give us the debugging
7072 information for this anonymous RECORD_TYPE. */
7073 TYPE_NAME (t) = NULL_TREE;
7075 /* If this is not the unqualified form of this pointer-to-member
7076 type, set the TYPE_MAIN_VARIANT for this type to be the
7077 unqualified type. Since they are actually RECORD_TYPEs that are
7078 not variants of each other, we must do this manually. */
7079 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7081 t = build_qualified_type (t, cp_type_quals (type));
7082 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7083 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7084 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7085 TREE_TYPE (TYPE_BINFO (t)) = t;
7088 /* Cache this pointer-to-member type so that we can find it again
7090 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7092 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7093 SET_TYPE_STRUCTURAL_EQUALITY (t);
7094 else if (TYPE_CANONICAL (type) != type)
7095 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7100 /* Create and return a pointer to data member type. */
7103 build_ptrmem_type (tree class_type, tree member_type)
7105 if (TREE_CODE (member_type) == METHOD_TYPE)
7109 arg_types = TYPE_ARG_TYPES (member_type);
7110 class_type = (cp_build_qualified_type
7112 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7114 = build_method_type_directly (class_type,
7115 TREE_TYPE (member_type),
7116 TREE_CHAIN (arg_types));
7117 return build_ptrmemfunc_type (build_pointer_type (member_type));
7121 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7122 return build_offset_type (class_type, member_type);
7126 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7127 Check to see that the definition is valid. Issue appropriate error
7128 messages. Return 1 if the definition is particularly bad, or 0
7132 check_static_variable_definition (tree decl, tree type)
7134 /* Motion 10 at San Diego: If a static const integral data member is
7135 initialized with an integral constant expression, the initializer
7136 may appear either in the declaration (within the class), or in
7137 the definition, but not both. If it appears in the class, the
7138 member is a member constant. The file-scope definition is always
7140 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7142 error ("invalid in-class initialization of static data member "
7143 "of non-integral type %qT",
7145 /* If we just return the declaration, crashes will sometimes
7146 occur. We therefore return void_type_node, as if this were a
7147 friend declaration, to cause callers to completely ignore
7148 this declaration. */
7151 else if (!CP_TYPE_CONST_P (type))
7152 error ("ISO C++ forbids in-class initialization of non-const "
7153 "static member %qD",
7155 else if (!INTEGRAL_TYPE_P (type))
7156 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7157 "%qD of non-integral type %qT", decl, type);
7162 /* Given the SIZE (i.e., number of elements) in an array, compute an
7163 appropriate index type for the array. If non-NULL, NAME is the
7164 name of the thing being declared. */
7167 compute_array_index_type (tree name, tree size)
7171 tree abi_1_itype = NULL_TREE;
7173 if (error_operand_p (size))
7174 return error_mark_node;
7176 type = TREE_TYPE (size);
7177 /* The array bound must be an integer type. */
7178 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7181 error ("size of array %qD has non-integral type %qT", name, type);
7183 error ("size of array has non-integral type %qT", type);
7184 size = integer_one_node;
7185 type = TREE_TYPE (size);
7188 /* We can only call value_dependent_expression_p on integral constant
7189 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7190 set if this isn't one. */
7191 if (processing_template_decl
7192 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7194 /* We cannot do any checking for a SIZE that isn't known to be
7195 constant. Just build the index type and mark that it requires
7196 structural equality checks. */
7197 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7198 size, integer_one_node));
7199 if (!TREE_SIDE_EFFECTS (size))
7201 TYPE_DEPENDENT_P (itype) = 1;
7202 TYPE_DEPENDENT_P_VALID (itype) = 1;
7204 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7208 if (!abi_version_at_least (2) && processing_template_decl)
7209 /* For abi-1, we handled all instances in templates the same way,
7210 even when they were non-dependent. This affects the manglings
7211 produced. So, we do the normal checking for non-dependent
7212 sizes, but at the end we'll return the same type that abi-1
7213 would have, but with TYPE_CANONICAL set to the "right"
7214 value that the current ABI would provide. */
7215 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7216 size, integer_one_node));
7218 /* The size might be the result of a cast. */
7219 STRIP_TYPE_NOPS (size);
7221 /* It might be a const variable or enumeration constant. */
7222 size = integral_constant_value (size);
7224 /* Normally, the array-bound will be a constant. */
7225 if (TREE_CODE (size) == INTEGER_CST)
7227 /* Check to see if the array bound overflowed. Make that an
7228 error, no matter how generous we're being. */
7229 constant_expression_error (size);
7231 /* An array must have a positive number of elements. */
7232 if (INT_CST_LT (size, integer_zero_node))
7235 error ("size of array %qD is negative", name);
7237 error ("size of array is negative");
7238 size = integer_one_node;
7240 /* As an extension we allow zero-sized arrays. We always allow
7241 them in system headers because glibc uses them. */
7242 else if (integer_zerop (size) && !in_system_header)
7245 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7247 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7250 else if (TREE_CONSTANT (size))
7252 /* `(int) &fn' is not a valid array bound. */
7254 error ("size of array %qD is not an integral constant-expression",
7257 error ("size of array is not an integral constant-expression");
7258 size = integer_one_node;
7260 else if (pedantic && warn_vla != 0)
7263 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7265 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7267 else if (warn_vla > 0)
7271 "variable length array %qD is used", name);
7274 "variable length array is used");
7277 if (processing_template_decl && !TREE_CONSTANT (size))
7278 /* A variable sized array. */
7279 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7282 HOST_WIDE_INT saved_processing_template_decl;
7284 /* Compute the index of the largest element in the array. It is
7285 one less than the number of elements in the array. We save
7286 and restore PROCESSING_TEMPLATE_DECL so that computations in
7287 cp_build_binary_op will be appropriately folded. */
7288 saved_processing_template_decl = processing_template_decl;
7289 processing_template_decl = 0;
7290 itype = cp_build_binary_op (input_location,
7292 cp_convert (ssizetype, size),
7293 cp_convert (ssizetype, integer_one_node),
7294 tf_warning_or_error);
7295 itype = fold (itype);
7296 processing_template_decl = saved_processing_template_decl;
7298 if (!TREE_CONSTANT (itype))
7299 /* A variable sized array. */
7300 itype = variable_size (itype);
7301 /* Make sure that there was no overflow when creating to a signed
7302 index type. (For example, on a 32-bit machine, an array with
7303 size 2^32 - 1 is too big.) */
7304 else if (TREE_CODE (itype) == INTEGER_CST
7305 && TREE_OVERFLOW (itype))
7307 error ("overflow in array dimension");
7308 TREE_OVERFLOW (itype) = 0;
7312 /* Create and return the appropriate index type. */
7315 tree t = build_index_type (itype);
7316 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7320 return build_index_type (itype);
7323 /* Returns the scope (if any) in which the entity declared by
7324 DECLARATOR will be located. If the entity was declared with an
7325 unqualified name, NULL_TREE is returned. */
7328 get_scope_of_declarator (const cp_declarator *declarator)
7330 while (declarator && declarator->kind != cdk_id)
7331 declarator = declarator->declarator;
7333 /* If the declarator-id is a SCOPE_REF, the scope in which the
7334 declaration occurs is the first operand. */
7336 && declarator->u.id.qualifying_scope)
7337 return declarator->u.id.qualifying_scope;
7339 /* Otherwise, the declarator is not a qualified name; the entity will
7340 be declared in the current scope. */
7344 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7345 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7349 create_array_type_for_decl (tree name, tree type, tree size)
7351 tree itype = NULL_TREE;
7352 const char* error_msg;
7354 /* If things have already gone awry, bail now. */
7355 if (type == error_mark_node || size == error_mark_node)
7356 return error_mark_node;
7358 /* Assume that everything will go OK. */
7361 /* There are some types which cannot be array elements. */
7362 switch (TREE_CODE (type))
7365 error_msg = "array of void";
7369 error_msg = "array of functions";
7372 case REFERENCE_TYPE:
7373 error_msg = "array of references";
7377 error_msg = "array of function members";
7384 /* If something went wrong, issue an error-message and return. */
7388 error ("declaration of %qD as %s", name, error_msg);
7390 error ("creating %s", error_msg);
7392 return error_mark_node;
7397 The constant expressions that specify the bounds of the arrays
7398 can be omitted only for the first member of the sequence. */
7399 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7402 error ("declaration of %qD as multidimensional array must "
7403 "have bounds for all dimensions except the first",
7406 error ("multidimensional array must have bounds for all "
7407 "dimensions except the first");
7409 return error_mark_node;
7412 /* Figure out the index type for the array. */
7414 itype = compute_array_index_type (name, size);
7417 T is called the array element type; this type shall not be [...] an
7418 abstract class type. */
7419 abstract_virtuals_error (name, type);
7421 return build_cplus_array_type (type, itype);
7424 /* Check that it's OK to declare a function with the indicated TYPE.
7425 SFK indicates the kind of special function (if any) that this
7426 function is. OPTYPE is the type given in a conversion operator
7427 declaration, or the class type for a constructor/destructor.
7428 Returns the actual return type of the function; that
7429 may be different than TYPE if an error occurs, or for certain
7430 special functions. */
7433 check_special_function_return_type (special_function_kind sfk,
7439 case sfk_constructor:
7441 error ("return type specification for constructor invalid");
7443 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7444 type = build_pointer_type (optype);
7446 type = void_type_node;
7449 case sfk_destructor:
7451 error ("return type specification for destructor invalid");
7452 /* We can't use the proper return type here because we run into
7453 problems with ambiguous bases and covariant returns.
7454 Java classes are left unchanged because (void *) isn't a valid
7455 Java type, and we don't want to change the Java ABI. */
7456 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7457 type = build_pointer_type (void_type_node);
7459 type = void_type_node;
7462 case sfk_conversion:
7464 error ("return type specified for %<operator %T%>", optype);
7475 /* A variable or data member (whose unqualified name is IDENTIFIER)
7476 has been declared with the indicated TYPE. If the TYPE is not
7477 acceptable, issue an error message and return a type to use for
7478 error-recovery purposes. */
7481 check_var_type (tree identifier, tree type)
7483 if (VOID_TYPE_P (type))
7486 error ("unnamed variable or field declared void");
7487 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7489 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7490 error ("variable or field %qE declared void", identifier);
7493 error ("variable or field declared void");
7494 type = error_mark_node;
7500 /* Given declspecs and a declarator (abstract or otherwise), determine
7501 the name and type of the object declared and construct a DECL node
7504 DECLSPECS points to the representation of declaration-specifier
7505 sequence that precedes declarator.
7507 DECL_CONTEXT says which syntactic context this declaration is in:
7508 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7509 FUNCDEF for a function definition. Like NORMAL but a few different
7510 error messages in each case. Return value may be zero meaning
7511 this definition is too screwy to try to parse.
7512 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7513 handle member functions (which have FIELD context).
7514 Return value may be zero meaning this definition is too screwy to
7516 PARM for a parameter declaration (either within a function prototype
7517 or before a function body). Make a PARM_DECL, or return void_type_node.
7518 CATCHPARM for a parameter declaration before a catch clause.
7519 TYPENAME if for a typename (in a cast or sizeof).
7520 Don't make a DECL node; just return the ..._TYPE node.
7521 FIELD for a struct or union field; make a FIELD_DECL.
7522 BITFIELD for a field with specified width.
7523 INITIALIZED is as for start_decl.
7525 ATTRLIST is a pointer to the list of attributes, which may be NULL
7526 if there are none; *ATTRLIST may be modified if attributes from inside
7527 the declarator should be applied to the declaration.
7529 When this function is called, scoping variables (such as
7530 CURRENT_CLASS_TYPE) should reflect the scope in which the
7531 declaration occurs, not the scope in which the new declaration will
7532 be placed. For example, on:
7536 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7539 Returns a DECL (if a declarator is present), a TYPE (if there is no
7540 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7544 grokdeclarator (const cp_declarator *declarator,
7545 const cp_decl_specifier_seq *declspecs,
7546 enum decl_context decl_context,
7550 tree type = NULL_TREE;
7552 int virtualp, explicitp, friendp, inlinep, staticp;
7553 int explicit_int = 0;
7554 int explicit_char = 0;
7555 int defaulted_int = 0;
7556 tree dependent_name = NULL_TREE;
7558 tree typedef_decl = NULL_TREE;
7559 const char *name = NULL;
7560 tree typedef_type = NULL_TREE;
7561 /* True if this declarator is a function definition. */
7562 bool funcdef_flag = false;
7563 cp_declarator_kind innermost_code = cdk_error;
7566 /* See the code below that used this. */
7567 tree decl_attr = NULL_TREE;
7570 /* Keep track of what sort of function is being processed
7571 so that we can warn about default return values, or explicit
7572 return values which do not match prescribed defaults. */
7573 special_function_kind sfk = sfk_none;
7575 tree dname = NULL_TREE;
7576 tree ctor_return_type = NULL_TREE;
7577 enum overload_flags flags = NO_SPECIAL;
7578 /* cv-qualifiers that apply to the declarator, for a declaration of
7579 a member function. */
7580 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7581 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7583 tree raises = NULL_TREE;
7584 int template_count = 0;
7585 tree returned_attrs = NULL_TREE;
7586 tree parms = NULL_TREE;
7587 const cp_declarator *id_declarator;
7588 /* The unqualified name of the declarator; either an
7589 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7590 tree unqualified_id;
7591 /* The class type, if any, in which this entity is located,
7592 or NULL_TREE if none. Note that this value may be different from
7593 the current class type; for example if an attempt is made to declare
7594 "A::f" inside "B", this value will be "A". */
7595 tree ctype = current_class_type;
7596 /* The NAMESPACE_DECL for the namespace in which this entity is
7597 located. If an unqualified name is used to declare the entity,
7598 this value will be NULL_TREE, even if the entity is located at
7600 tree in_namespace = NULL_TREE;
7601 cp_storage_class storage_class;
7602 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7603 bool type_was_error_mark_node = false;
7604 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7605 bool set_no_warning = false;
7607 signed_p = declspecs->specs[(int)ds_signed];
7608 unsigned_p = declspecs->specs[(int)ds_unsigned];
7609 short_p = declspecs->specs[(int)ds_short];
7610 long_p = declspecs->specs[(int)ds_long];
7611 longlong = declspecs->specs[(int)ds_long] >= 2;
7612 thread_p = declspecs->specs[(int)ds_thread];
7614 if (decl_context == FUNCDEF)
7615 funcdef_flag = true, decl_context = NORMAL;
7616 else if (decl_context == MEMFUNCDEF)
7617 funcdef_flag = true, decl_context = FIELD;
7618 else if (decl_context == BITFIELD)
7619 bitfield = 1, decl_context = FIELD;
7621 if (initialized > 1)
7622 funcdef_flag = true;
7624 /* Look inside a declarator for the name being declared
7625 and get it as a string, for an error message. */
7626 for (id_declarator = declarator;
7628 id_declarator = id_declarator->declarator)
7630 if (id_declarator->kind != cdk_id)
7631 innermost_code = id_declarator->kind;
7633 switch (id_declarator->kind)
7636 if (id_declarator->declarator
7637 && id_declarator->declarator->kind == cdk_id)
7639 sfk = id_declarator->declarator->u.id.sfk;
7640 if (sfk == sfk_destructor)
7647 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7648 tree decl = id_declarator->u.id.unqualified_name;
7651 if (qualifying_scope)
7653 if (at_function_scope_p ())
7657 A declarator-id shall not be qualified except
7660 None of the cases are permitted in block
7662 if (qualifying_scope == global_namespace)
7663 error ("invalid use of qualified-name %<::%D%>",
7665 else if (TYPE_P (qualifying_scope))
7666 error ("invalid use of qualified-name %<%T::%D%>",
7667 qualifying_scope, decl);
7669 error ("invalid use of qualified-name %<%D::%D%>",
7670 qualifying_scope, decl);
7671 return error_mark_node;
7673 else if (TYPE_P (qualifying_scope))
7675 ctype = qualifying_scope;
7676 if (innermost_code != cdk_function
7677 && current_class_type
7678 && !UNIQUELY_DERIVED_FROM_P (ctype,
7679 current_class_type))
7681 error ("type %qT is not derived from type %qT",
7682 ctype, current_class_type);
7683 return error_mark_node;
7686 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7687 in_namespace = qualifying_scope;
7689 switch (TREE_CODE (decl))
7695 if (innermost_code != cdk_function)
7697 error ("declaration of %qD as non-function", decl);
7698 return error_mark_node;
7700 else if (!qualifying_scope
7701 && !(current_class_type && at_class_scope_p ()))
7703 error ("declaration of %qD as non-member", decl);
7704 return error_mark_node;
7707 type = TREE_OPERAND (decl, 0);
7709 type = constructor_name (type);
7710 name = IDENTIFIER_POINTER (type);
7715 case TEMPLATE_ID_EXPR:
7717 tree fns = TREE_OPERAND (decl, 0);
7720 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7722 gcc_assert (is_overloaded_fn (dname));
7723 dname = DECL_NAME (get_first_fn (dname));
7728 case IDENTIFIER_NODE:
7729 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7732 if (C_IS_RESERVED_WORD (dname))
7734 error ("declarator-id missing; using reserved word %qD",
7736 name = IDENTIFIER_POINTER (dname);
7738 else if (!IDENTIFIER_TYPENAME_P (dname))
7739 name = IDENTIFIER_POINTER (dname);
7742 gcc_assert (flags == NO_SPECIAL);
7743 flags = TYPENAME_FLAG;
7744 ctor_return_type = TREE_TYPE (dname);
7745 sfk = sfk_conversion;
7746 if (is_typename_at_global_scope (dname))
7747 name = IDENTIFIER_POINTER (dname);
7749 name = "<invalid operator>";
7766 return error_mark_node;
7771 if (id_declarator->kind == cdk_id)
7777 The declarator in a function-definition shall have the form
7778 D1 ( parameter-declaration-clause) ... */
7779 if (funcdef_flag && innermost_code != cdk_function)
7781 error ("function definition does not declare parameters");
7782 return error_mark_node;
7785 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7786 && innermost_code != cdk_function
7787 && ! (ctype && !declspecs->any_specifiers_p))
7789 error ("declaration of %qD as non-function", dname);
7790 return error_mark_node;
7793 /* Anything declared one level down from the top level
7794 must be one of the parameters of a function
7795 (because the body is at least two levels down). */
7797 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7798 by not allowing C++ class definitions to specify their parameters
7799 with xdecls (must be spec.d in the parmlist).
7801 Since we now wait to push a class scope until we are sure that
7802 we are in a legitimate method context, we must set oldcname
7803 explicitly (since current_class_name is not yet alive).
7805 We also want to avoid calling this a PARM if it is in a namespace. */
7807 if (decl_context == NORMAL && !toplevel_bindings_p ())
7809 struct cp_binding_level *b = current_binding_level;
7810 current_binding_level = b->level_chain;
7811 if (current_binding_level != 0 && toplevel_bindings_p ())
7812 decl_context = PARM;
7813 current_binding_level = b;
7817 name = decl_context == PARM ? "parameter" : "type name";
7819 /* If there were multiple types specified in the decl-specifier-seq,
7820 issue an error message. */
7821 if (declspecs->multiple_types_p)
7823 error ("two or more data types in declaration of %qs", name);
7824 return error_mark_node;
7827 if (declspecs->conflicting_specifiers_p)
7829 error ("conflicting specifiers in declaration of %qs", name);
7830 return error_mark_node;
7833 /* Extract the basic type from the decl-specifier-seq. */
7834 type = declspecs->type;
7835 if (type == error_mark_node)
7838 type_was_error_mark_node = true;
7840 /* If the entire declaration is itself tagged as deprecated then
7841 suppress reports of deprecated items. */
7842 if (type && TREE_DEPRECATED (type)
7843 && deprecated_state != DEPRECATED_SUPPRESS)
7844 warn_deprecated_use (type);
7845 if (type && TREE_CODE (type) == TYPE_DECL)
7847 typedef_decl = type;
7848 type = TREE_TYPE (typedef_decl);
7849 if (TREE_DEPRECATED (type)
7850 && DECL_ARTIFICIAL (typedef_decl)
7851 && deprecated_state != DEPRECATED_SUPPRESS)
7852 warn_deprecated_use (type);
7854 /* No type at all: default to `int', and set DEFAULTED_INT
7855 because it was not a user-defined typedef. */
7856 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7858 /* These imply 'int'. */
7859 type = integer_type_node;
7863 explicit_int = declspecs->explicit_int_p;
7864 explicit_char = declspecs->explicit_char_p;
7867 /* See the code below that used this. */
7869 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7871 typedef_type = type;
7874 if (sfk != sfk_conversion)
7875 ctor_return_type = ctype;
7877 if (sfk != sfk_none)
7878 type = check_special_function_return_type (sfk, type,
7880 else if (type == NULL_TREE)
7886 /* We handle `main' specially here, because 'main () { }' is so
7887 common. With no options, it is allowed. With -Wreturn-type,
7888 it is a warning. It is only an error with -pedantic-errors. */
7889 is_main = (funcdef_flag
7890 && dname && MAIN_NAME_P (dname)
7891 && ctype == NULL_TREE
7892 && in_namespace == NULL_TREE
7893 && current_namespace == global_namespace);
7895 if (type_was_error_mark_node)
7896 /* We've already issued an error, don't complain more. */;
7897 else if (in_system_header || flag_ms_extensions)
7898 /* Allow it, sigh. */;
7900 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7902 pedwarn (input_location, OPT_pedantic,
7903 "ISO C++ forbids declaration of %qs with no type", name);
7905 warning (OPT_Wreturn_type,
7906 "ISO C++ forbids declaration of %qs with no type", name);
7908 type = integer_type_node;
7913 /* Now process the modifiers that were specified
7914 and check for invalid combinations. */
7916 /* Long double is a special combination. */
7917 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7920 type = build_qualified_type (long_double_type_node,
7921 cp_type_quals (type));
7924 /* Check all other uses of type modifiers. */
7926 if (unsigned_p || signed_p || long_p || short_p)
7930 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7931 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7932 else if (signed_p && unsigned_p)
7933 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7934 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7935 error ("%<long long%> invalid for %qs", name);
7936 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7937 error ("%<long%> invalid for %qs", name);
7938 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7939 error ("%<short%> invalid for %qs", name);
7940 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7941 error ("%<long%> or %<short%> invalid for %qs", name);
7942 else if ((long_p || short_p) && explicit_char)
7943 error ("%<long%> or %<short%> specified with char for %qs", name);
7944 else if (long_p && short_p)
7945 error ("%<long%> and %<short%> specified together for %qs", name);
7946 else if (type == char16_type_node || type == char32_type_node)
7948 if (signed_p || unsigned_p)
7949 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7950 else if (short_p || long_p)
7951 error ("%<short%> or %<long%> invalid for %qs", name);
7956 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7958 pedwarn (input_location, OPT_pedantic,
7959 "long, short, signed or unsigned used invalidly for %qs",
7961 if (flag_pedantic_errors)
7966 /* Discard the type modifiers if they are invalid. */
7977 /* Decide whether an integer type is signed or not.
7978 Optionally treat bitfields as signed by default. */
7982 It is implementation-defined whether a plain (neither
7983 explicitly signed or unsigned) char, short, int, or long
7984 bit-field is signed or unsigned.
7986 Naturally, we extend this to long long as well. Note that
7987 this does not include wchar_t. */
7988 || (bitfield && !flag_signed_bitfields
7990 /* A typedef for plain `int' without `signed' can be
7991 controlled just like plain `int', but a typedef for
7992 `signed int' cannot be so controlled. */
7994 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7995 && TREE_CODE (type) == INTEGER_TYPE
7996 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7999 type = long_long_unsigned_type_node;
8001 type = long_unsigned_type_node;
8003 type = short_unsigned_type_node;
8004 else if (type == char_type_node)
8005 type = unsigned_char_type_node;
8006 else if (typedef_decl)
8007 type = unsigned_type_for (type);
8009 type = unsigned_type_node;
8011 else if (signed_p && type == char_type_node)
8012 type = signed_char_type_node;
8014 type = long_long_integer_type_node;
8016 type = long_integer_type_node;
8018 type = short_integer_type_node;
8020 if (declspecs->specs[(int)ds_complex])
8022 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8023 error ("complex invalid for %qs", name);
8024 /* If we just have "complex", it is equivalent to
8025 "complex double", but if any modifiers at all are specified it is
8026 the complex form of TYPE. E.g, "complex short" is
8027 "complex short int". */
8029 else if (defaulted_int && ! longlong
8030 && ! (long_p || short_p || signed_p || unsigned_p))
8031 type = complex_double_type_node;
8032 else if (type == integer_type_node)
8033 type = complex_integer_type_node;
8034 else if (type == float_type_node)
8035 type = complex_float_type_node;
8036 else if (type == double_type_node)
8037 type = complex_double_type_node;
8038 else if (type == long_double_type_node)
8039 type = complex_long_double_type_node;
8041 type = build_complex_type (type);
8044 type_quals = TYPE_UNQUALIFIED;
8045 if (declspecs->specs[(int)ds_const])
8046 type_quals |= TYPE_QUAL_CONST;
8047 if (declspecs->specs[(int)ds_volatile])
8048 type_quals |= TYPE_QUAL_VOLATILE;
8049 if (declspecs->specs[(int)ds_restrict])
8050 type_quals |= TYPE_QUAL_RESTRICT;
8051 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8052 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8055 if (TREE_CODE (type) == FUNCTION_TYPE
8056 && type_quals != TYPE_UNQUALIFIED)
8058 /* This was an error in C++98 (cv-qualifiers cannot be added to
8059 a function type), but DR 295 makes the code well-formed by
8060 dropping the extra qualifiers. */
8063 tree bad_type = build_qualified_type (type, type_quals);
8064 pedwarn (input_location, OPT_pedantic,
8065 "ignoring %qV qualifiers added to function type %qT",
8068 type_quals = TYPE_UNQUALIFIED;
8070 type_quals |= cp_type_quals (type);
8071 type = cp_build_qualified_type_real
8072 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8073 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8074 /* We might have ignored or rejected some of the qualifiers. */
8075 type_quals = cp_type_quals (type);
8078 inlinep = !! declspecs->specs[(int)ds_inline];
8079 virtualp = !! declspecs->specs[(int)ds_virtual];
8080 explicitp = !! declspecs->specs[(int)ds_explicit];
8082 storage_class = declspecs->storage_class;
8083 if (storage_class == sc_static)
8084 staticp = 1 + (decl_context == FIELD);
8086 if (virtualp && staticp == 2)
8088 error ("member %qD cannot be declared both virtual and static", dname);
8089 storage_class = sc_none;
8092 friendp = !! declspecs->specs[(int)ds_friend];
8094 if (dependent_name && !friendp)
8096 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8097 return error_mark_node;
8100 /* Issue errors about use of storage classes for parameters. */
8101 if (decl_context == PARM)
8103 if (declspecs->specs[(int)ds_typedef])
8105 error ("typedef declaration invalid in parameter declaration");
8106 return error_mark_node;
8108 else if (storage_class == sc_static
8109 || storage_class == sc_extern
8111 error ("storage class specifiers invalid in parameter declarations");
8113 if (type_uses_auto (type))
8115 error ("parameter declared %<auto%>");
8116 type = error_mark_node;
8120 /* Give error if `virtual' is used outside of class declaration. */
8122 && (current_class_name == NULL_TREE || decl_context != FIELD))
8124 error ("%<virtual%> outside class declaration");
8128 /* Static anonymous unions are dealt with here. */
8129 if (staticp && decl_context == TYPENAME
8131 && ANON_AGGR_TYPE_P (declspecs->type))
8132 decl_context = FIELD;
8134 /* Warn about storage classes that are invalid for certain
8135 kinds of declarations (parameters, typenames, etc.). */
8138 && storage_class != sc_extern
8139 && storage_class != sc_static)
8140 || declspecs->specs[(int)ds_typedef]))
8142 error ("multiple storage classes in declaration of %qs", name);
8145 if (decl_context != NORMAL
8146 && ((storage_class != sc_none
8147 && storage_class != sc_mutable)
8150 if ((decl_context == PARM || decl_context == CATCHPARM)
8151 && (storage_class == sc_register
8152 || storage_class == sc_auto))
8154 else if (declspecs->specs[(int)ds_typedef])
8156 else if (decl_context == FIELD
8157 /* C++ allows static class elements. */
8158 && storage_class == sc_static)
8159 /* C++ also allows inlines and signed and unsigned elements,
8160 but in those cases we don't come in here. */
8164 if (decl_context == FIELD)
8165 error ("storage class specified for %qs", name);
8168 if (decl_context == PARM || decl_context == CATCHPARM)
8169 error ("storage class specified for parameter %qs", name);
8171 error ("storage class specified for typename");
8173 if (storage_class == sc_register
8174 || storage_class == sc_auto
8175 || storage_class == sc_extern
8177 storage_class = sc_none;
8180 else if (storage_class == sc_extern && funcdef_flag
8181 && ! toplevel_bindings_p ())
8182 error ("nested function %qs declared %<extern%>", name);
8183 else if (toplevel_bindings_p ())
8185 if (storage_class == sc_auto)
8186 error ("top-level declaration of %qs specifies %<auto%>", name);
8189 && storage_class != sc_extern
8190 && storage_class != sc_static)
8192 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8197 if (storage_class && friendp)
8199 error ("storage class specifiers invalid in friend function declarations");
8200 storage_class = sc_none;
8205 unqualified_id = NULL_TREE;
8208 unqualified_id = id_declarator->u.id.unqualified_name;
8209 switch (TREE_CODE (unqualified_id))
8212 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8213 if (TYPE_P (unqualified_id))
8214 unqualified_id = constructor_name (unqualified_id);
8217 case IDENTIFIER_NODE:
8218 case TEMPLATE_ID_EXPR:
8226 /* Determine the type of the entity declared by recurring on the
8228 for (; declarator; declarator = declarator->declarator)
8230 const cp_declarator *inner_declarator;
8233 if (type == error_mark_node)
8234 return error_mark_node;
8236 attrs = declarator->attributes;
8242 if (declarator == NULL || declarator->kind == cdk_id)
8243 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8244 if (declarator->kind == cdk_function)
8245 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8246 if (declarator->kind == cdk_array)
8247 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8248 returned_attrs = decl_attributes (&type,
8249 chainon (returned_attrs, attrs),
8253 if (declarator->kind == cdk_id)
8256 inner_declarator = declarator->declarator;
8258 switch (declarator->kind)
8261 type = create_array_type_for_decl (dname, type,
8262 declarator->u.array.bounds);
8270 /* Declaring a function type.
8271 Make sure we have a valid type for the function to return. */
8273 if (type_quals != TYPE_UNQUALIFIED)
8275 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8276 warning (OPT_Wignored_qualifiers,
8277 "type qualifiers ignored on function return type");
8278 /* We now know that the TYPE_QUALS don't apply to the
8279 decl, but to its return type. */
8280 type_quals = TYPE_UNQUALIFIED;
8281 set_no_warning = true;
8284 /* Error about some types functions can't return. */
8286 if (TREE_CODE (type) == FUNCTION_TYPE)
8288 error ("%qs declared as function returning a function", name);
8289 return error_mark_node;
8291 if (TREE_CODE (type) == ARRAY_TYPE)
8293 error ("%qs declared as function returning an array", name);
8294 return error_mark_node;
8297 /* Pick up type qualifiers which should be applied to `this'. */
8298 memfn_quals = declarator->u.function.qualifiers;
8300 /* Pick up the exception specifications. */
8301 raises = declarator->u.function.exception_specification;
8303 /* Say it's a definition only for the CALL_EXPR
8304 closest to the identifier. */
8305 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8307 /* Handle a late-specified return type. */
8310 if (type_uses_auto (type))
8312 if (!declarator->u.function.late_return_type)
8314 error ("%qs function uses %<auto%> type specifier without"
8315 " late return type", name);
8316 return error_mark_node;
8318 else if (!is_auto (type))
8320 error ("%qs function with late return type has"
8321 " %qT as its type rather than plain %<auto%>",
8323 return error_mark_node;
8326 else if (declarator->u.function.late_return_type)
8328 error ("%qs function with late return type not declared"
8329 " with %<auto%> type specifier", name);
8330 return error_mark_node;
8333 type = splice_late_return_type
8334 (type, declarator->u.function.late_return_type);
8335 if (type == error_mark_node)
8336 return error_mark_node;
8338 if (ctype == NULL_TREE
8339 && decl_context == FIELD
8341 && (friendp == 0 || dname == current_class_name))
8342 ctype = current_class_type;
8344 if (ctype && (sfk == sfk_constructor
8345 || sfk == sfk_destructor))
8347 /* We are within a class's scope. If our declarator name
8348 is the same as the class name, and we are defining
8349 a function, then it is a constructor/destructor, and
8350 therefore returns a void type. */
8352 /* ISO C++ 12.4/2. A destructor may not be declared
8353 const or volatile. A destructor may not be
8356 ISO C++ 12.1. A constructor may not be declared
8357 const or volatile. A constructor may not be
8358 virtual. A constructor may not be static. */
8360 error ((flags == DTOR_FLAG)
8361 ? "destructor cannot be static member function"
8362 : "constructor cannot be static member function");
8365 error ((flags == DTOR_FLAG)
8366 ? "destructors may not be cv-qualified"
8367 : "constructors may not be cv-qualified");
8368 memfn_quals = TYPE_UNQUALIFIED;
8371 if (decl_context == FIELD
8372 && !member_function_or_else (ctype,
8375 return error_mark_node;
8377 if (flags != DTOR_FLAG)
8379 /* It's a constructor. */
8384 permerror (input_location, "constructors cannot be declared virtual");
8387 if (decl_context == FIELD
8388 && sfk != sfk_constructor)
8389 return error_mark_node;
8391 if (decl_context == FIELD)
8397 error ("can't initialize friend function %qs", name);
8400 /* Cannot be both friend and virtual. */
8401 error ("virtual functions cannot be friends");
8404 if (decl_context == NORMAL)
8405 error ("friend declaration not in class definition");
8406 if (current_function_decl && funcdef_flag)
8407 error ("can't define friend function %qs in a local "
8412 arg_types = grokparms (declarator->u.function.parameters,
8415 if (inner_declarator
8416 && inner_declarator->kind == cdk_id
8417 && inner_declarator->u.id.sfk == sfk_destructor
8418 && arg_types != void_list_node)
8420 error ("destructors may not have parameters");
8421 arg_types = void_list_node;
8425 type = build_function_type (type, arg_types);
8432 /* Filter out pointers-to-references and references-to-references.
8433 We can get these if a TYPE_DECL is used. */
8435 if (TREE_CODE (type) == REFERENCE_TYPE)
8437 if (declarator->kind != cdk_reference)
8439 error ("cannot declare pointer to %q#T", type);
8440 type = TREE_TYPE (type);
8443 /* In C++0x, we allow reference to reference declarations
8444 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8445 and template type arguments [14.3.1/4 temp.arg.type]. The
8446 check for direct reference to reference declarations, which
8447 are still forbidden, occurs below. Reasoning behind the change
8448 can be found in DR106, DR540, and the rvalue reference
8450 else if (cxx_dialect == cxx98)
8452 error ("cannot declare reference to %q#T", type);
8453 type = TREE_TYPE (type);
8456 else if (VOID_TYPE_P (type))
8458 if (declarator->kind == cdk_reference)
8459 error ("cannot declare reference to %q#T", type);
8460 else if (declarator->kind == cdk_ptrmem)
8461 error ("cannot declare pointer to %q#T member", type);
8464 /* We now know that the TYPE_QUALS don't apply to the decl,
8465 but to the target of the pointer. */
8466 type_quals = TYPE_UNQUALIFIED;
8468 if (declarator->kind == cdk_ptrmem
8469 && (TREE_CODE (type) == FUNCTION_TYPE
8470 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8472 memfn_quals |= cp_type_quals (type);
8473 type = build_memfn_type (type,
8474 declarator->u.pointer.class_type,
8476 memfn_quals = TYPE_UNQUALIFIED;
8479 if (declarator->kind == cdk_reference)
8481 /* In C++0x, the type we are creating a reference to might be
8482 a typedef which is itself a reference type. In that case,
8483 we follow the reference collapsing rules in
8484 [7.1.3/8 dcl.typedef] to create the final reference type:
8486 "If a typedef TD names a type that is a reference to a type
8487 T, an attempt to create the type 'lvalue reference to cv TD'
8488 creates the type 'lvalue reference to T,' while an attempt
8489 to create the type "rvalue reference to cv TD' creates the
8492 if (!VOID_TYPE_P (type))
8493 type = cp_build_reference_type
8494 ((TREE_CODE (type) == REFERENCE_TYPE
8495 ? TREE_TYPE (type) : type),
8496 (declarator->u.reference.rvalue_ref
8497 && (TREE_CODE(type) != REFERENCE_TYPE
8498 || TYPE_REF_IS_RVALUE (type))));
8500 /* In C++0x, we need this check for direct reference to
8501 reference declarations, which are forbidden by
8502 [8.3.2/5 dcl.ref]. Reference to reference declarations
8503 are only allowed indirectly through typedefs and template
8504 type arguments. Example:
8506 void foo(int & &); // invalid ref-to-ref decl
8508 typedef int & int_ref;
8509 void foo(int_ref &); // valid ref-to-ref decl
8511 if (inner_declarator && inner_declarator->kind == cdk_reference)
8512 error ("cannot declare reference to %q#T, which is not "
8513 "a typedef or a template type argument", type);
8515 else if (TREE_CODE (type) == METHOD_TYPE)
8516 type = build_ptrmemfunc_type (build_pointer_type (type));
8517 else if (declarator->kind == cdk_ptrmem)
8519 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8521 if (declarator->u.pointer.class_type == error_mark_node)
8522 /* We will already have complained. */
8523 type = error_mark_node;
8525 type = build_ptrmem_type (declarator->u.pointer.class_type,
8529 type = build_pointer_type (type);
8531 /* Process a list of type modifier keywords (such as
8532 const or volatile) that were given inside the `*' or `&'. */
8534 if (declarator->u.pointer.qualifiers)
8537 = cp_build_qualified_type (type,
8538 declarator->u.pointer.qualifiers);
8539 type_quals = cp_type_quals (type);
8552 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8553 && TREE_CODE (type) != FUNCTION_TYPE
8554 && TREE_CODE (type) != METHOD_TYPE)
8556 error ("template-id %qD used as a declarator",
8558 unqualified_id = dname;
8561 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8562 qualified with a class-name, turn it into a METHOD_TYPE, unless
8563 we know that the function is static. We take advantage of this
8564 opportunity to do other processing that pertains to entities
8565 explicitly declared to be class members. Note that if DECLARATOR
8566 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8567 would not have exited the loop above. */
8569 && declarator->u.id.qualifying_scope
8570 && TYPE_P (declarator->u.id.qualifying_scope))
8574 ctype = declarator->u.id.qualifying_scope;
8575 ctype = TYPE_MAIN_VARIANT (ctype);
8577 while (t != NULL_TREE && CLASS_TYPE_P (t))
8579 /* You're supposed to have one `template <...>' for every
8580 template class, but you don't need one for a full
8581 specialization. For example:
8583 template <class T> struct S{};
8584 template <> struct S<int> { void f(); };
8585 void S<int>::f () {}
8587 is correct; there shouldn't be a `template <>' for the
8588 definition of `S<int>::f'. */
8589 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8590 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8591 /* T is an explicit (not partial) specialization. All
8592 containing classes must therefore also be explicitly
8595 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8596 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8597 template_count += 1;
8599 t = TYPE_MAIN_DECL (t);
8600 t = DECL_CONTEXT (t);
8603 if (ctype == current_class_type)
8607 permerror (input_location, "member functions are implicitly friends of their class");
8611 permerror (declarator->id_loc,
8612 "extra qualification %<%T::%> on member %qs",
8615 else if (/* If the qualifying type is already complete, then we
8616 can skip the following checks. */
8617 !COMPLETE_TYPE_P (ctype)
8618 && (/* If the function is being defined, then
8619 qualifying type must certainly be complete. */
8621 /* A friend declaration of "T::f" is OK, even if
8622 "T" is a template parameter. But, if this
8623 function is not a friend, the qualifying type
8625 || (!friendp && !CLASS_TYPE_P (ctype))
8626 /* For a declaration, the type need not be
8627 complete, if either it is dependent (since there
8628 is no meaningful definition of complete in that
8629 case) or the qualifying class is currently being
8631 || !(dependent_type_p (ctype)
8632 || currently_open_class (ctype)))
8633 /* Check that the qualifying type is complete. */
8634 && !complete_type_or_else (ctype, NULL_TREE))
8635 return error_mark_node;
8636 else if (TREE_CODE (type) == FUNCTION_TYPE)
8638 tree sname = declarator->u.id.unqualified_name;
8640 if (current_class_type
8641 && (!friendp || funcdef_flag))
8644 ? "cannot define member function %<%T::%s%> within %<%T%>"
8645 : "cannot declare member function %<%T::%s%> within %<%T%>",
8646 ctype, name, current_class_type);
8647 return error_mark_node;
8650 if (TREE_CODE (sname) == IDENTIFIER_NODE
8651 && NEW_DELETE_OPNAME_P (sname))
8652 /* Overloaded operator new and operator delete
8653 are always static functions. */
8656 type = build_memfn_type (type, ctype, memfn_quals);
8658 else if (declspecs->specs[(int)ds_typedef]
8659 && current_class_type)
8661 error ("cannot declare member %<%T::%s%> within %qT",
8662 ctype, name, current_class_type);
8663 return error_mark_node;
8667 /* Now TYPE has the actual type. */
8672 *attrlist = chainon (returned_attrs, *attrlist);
8674 attrlist = &returned_attrs;
8677 /* Handle parameter packs. */
8678 if (parameter_pack_p)
8680 if (decl_context == PARM)
8681 /* Turn the type into a pack expansion.*/
8682 type = make_pack_expansion (type);
8684 error ("non-parameter %qs cannot be a parameter pack", name);
8687 /* Did array size calculations overflow? */
8689 if (TREE_CODE (type) == ARRAY_TYPE
8690 && COMPLETE_TYPE_P (type)
8691 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8692 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8694 error ("size of array %qs is too large", name);
8695 /* If we proceed with the array type as it is, we'll eventually
8696 crash in tree_low_cst(). */
8697 type = error_mark_node;
8700 if ((decl_context == FIELD || decl_context == PARM)
8701 && !processing_template_decl
8702 && variably_modified_type_p (type, NULL_TREE))
8704 if (decl_context == FIELD)
8705 error ("data member may not have variably modified type %qT", type);
8707 error ("parameter may not have variably modified type %qT", type);
8708 type = error_mark_node;
8711 if (explicitp == 1 || (explicitp && friendp))
8713 /* [dcl.fct.spec] The explicit specifier shall only be used in
8714 declarations of constructors within a class definition. */
8715 error ("only declarations of constructors can be %<explicit%>");
8719 if (storage_class == sc_mutable)
8721 if (decl_context != FIELD || friendp)
8723 error ("non-member %qs cannot be declared %<mutable%>", name);
8724 storage_class = sc_none;
8726 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8728 error ("non-object member %qs cannot be declared %<mutable%>", name);
8729 storage_class = sc_none;
8731 else if (TREE_CODE (type) == FUNCTION_TYPE
8732 || TREE_CODE (type) == METHOD_TYPE)
8734 error ("function %qs cannot be declared %<mutable%>", name);
8735 storage_class = sc_none;
8739 error ("static %qs cannot be declared %<mutable%>", name);
8740 storage_class = sc_none;
8742 else if (type_quals & TYPE_QUAL_CONST)
8744 error ("const %qs cannot be declared %<mutable%>", name);
8745 storage_class = sc_none;
8749 /* If this is declaring a typedef name, return a TYPE_DECL. */
8750 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8754 /* Note that the grammar rejects storage classes
8755 in typenames, fields or parameters. */
8756 if (current_lang_name == lang_name_java)
8757 TYPE_FOR_JAVA (type) = 1;
8759 /* This declaration:
8761 typedef void f(int) const;
8763 declares a function type which is not a member of any
8764 particular class, but which is cv-qualified; for
8765 example "f S::*" declares a pointer to a const-qualified
8766 member function of S. We record the cv-qualification in the
8768 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8770 type = cp_build_qualified_type (type, memfn_quals);
8772 /* We have now dealt with these qualifiers. */
8773 memfn_quals = TYPE_UNQUALIFIED;
8776 if (decl_context == FIELD)
8777 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8779 decl = build_decl (TYPE_DECL, unqualified_id, type);
8780 if (id_declarator && declarator->u.id.qualifying_scope) {
8781 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8782 TREE_TYPE (decl) = error_mark_node;
8785 if (decl_context != FIELD)
8787 if (!current_function_decl)
8788 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8789 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8790 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8791 (current_function_decl)))
8792 /* The TYPE_DECL is "abstract" because there will be
8793 clones of this constructor/destructor, and there will
8794 be copies of this TYPE_DECL generated in those
8796 DECL_ABSTRACT (decl) = 1;
8798 else if (constructor_name_p (unqualified_id, current_class_type))
8799 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8800 "as enclosing class",
8803 /* If the user declares "typedef struct {...} foo" then the
8804 struct will have an anonymous name. Fill that name in now.
8805 Nothing can refer to it, so nothing needs know about the name
8807 if (type != error_mark_node
8810 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8811 && TYPE_ANONYMOUS_P (type)
8812 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8814 tree oldname = TYPE_NAME (type);
8817 /* Replace the anonymous name with the real name everywhere. */
8818 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8819 if (TYPE_NAME (t) == oldname)
8820 TYPE_NAME (t) = decl;
8822 if (TYPE_LANG_SPECIFIC (type))
8823 TYPE_WAS_ANONYMOUS (type) = 1;
8825 /* If this is a typedef within a template class, the nested
8826 type is a (non-primary) template. The name for the
8827 template needs updating as well. */
8828 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8829 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8830 = TYPE_IDENTIFIER (type);
8832 /* FIXME remangle member functions; member functions of a
8833 type with external linkage have external linkage. */
8837 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8838 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8840 bad_specifiers (decl, "type", virtualp,
8841 memfn_quals != TYPE_UNQUALIFIED,
8842 inlinep, friendp, raises != NULL_TREE);
8847 /* Detect the case of an array type of unspecified size
8848 which came, as such, direct from a typedef name.
8849 We must copy the type, so that the array's domain can be
8850 individually set by the object's initializer. */
8852 if (type && typedef_type
8853 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8854 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8855 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8857 /* Detect where we're using a typedef of function type to declare a
8858 function. PARMS will not be set, so we must create it now. */
8860 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8862 tree decls = NULL_TREE;
8865 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8867 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8869 TREE_CHAIN (decl) = decls;
8873 parms = nreverse (decls);
8875 if (decl_context != TYPENAME)
8877 /* A cv-qualifier-seq shall only be part of the function type
8878 for a non-static member function. [8.3.5/4 dcl.fct] */
8879 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8880 && (current_class_type == NULL_TREE || staticp) )
8883 ? G_("qualified function types cannot be used to "
8884 "declare static member functions")
8885 : G_("qualified function types cannot be used to "
8886 "declare free functions"));
8887 type = TYPE_MAIN_VARIANT (type);
8890 /* The qualifiers on the function type become the qualifiers on
8891 the non-static member function. */
8892 memfn_quals |= cp_type_quals (type);
8896 /* If this is a type name (such as, in a cast or sizeof),
8897 compute the type and return it now. */
8899 if (decl_context == TYPENAME)
8901 /* Note that the grammar rejects storage classes
8902 in typenames, fields or parameters. */
8903 if (type_quals != TYPE_UNQUALIFIED)
8904 type_quals = TYPE_UNQUALIFIED;
8906 /* Special case: "friend class foo" looks like a TYPENAME context. */
8909 if (type_quals != TYPE_UNQUALIFIED)
8911 error ("type qualifiers specified for friend class declaration");
8912 type_quals = TYPE_UNQUALIFIED;
8916 error ("%<inline%> specified for friend class declaration");
8922 /* Don't allow friend declaration without a class-key. */
8923 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8924 permerror (input_location, "template parameters cannot be friends");
8925 else if (TREE_CODE (type) == TYPENAME_TYPE)
8926 permerror (input_location, "friend declaration requires class-key, "
8927 "i.e. %<friend class %T::%D%>",
8928 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8930 permerror (input_location, "friend declaration requires class-key, "
8931 "i.e. %<friend %#T%>",
8935 /* Only try to do this stuff if we didn't already give up. */
8936 if (type != integer_type_node)
8938 /* A friendly class? */
8939 if (current_class_type)
8940 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8943 error ("trying to make class %qT a friend of global scope",
8946 type = void_type_node;
8949 else if (memfn_quals)
8951 if (ctype == NULL_TREE)
8953 if (TREE_CODE (type) != METHOD_TYPE)
8954 error ("invalid qualifiers on non-member function type");
8956 ctype = TYPE_METHOD_BASETYPE (type);
8959 type = build_memfn_type (type, ctype, memfn_quals);
8964 else if (unqualified_id == NULL_TREE && decl_context != PARM
8965 && decl_context != CATCHPARM
8966 && TREE_CODE (type) != UNION_TYPE
8969 error ("abstract declarator %qT used as declaration", type);
8970 return error_mark_node;
8973 /* Only functions may be declared using an operator-function-id. */
8975 && IDENTIFIER_OPNAME_P (unqualified_id)
8976 && TREE_CODE (type) != FUNCTION_TYPE
8977 && TREE_CODE (type) != METHOD_TYPE)
8979 error ("declaration of %qD as non-function", unqualified_id);
8980 return error_mark_node;
8983 /* We don't check parameter types here because we can emit a better
8984 error message later. */
8985 if (decl_context != PARM)
8987 type = check_var_type (unqualified_id, type);
8988 if (type == error_mark_node)
8989 return error_mark_node;
8992 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8993 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8995 if (decl_context == PARM || decl_context == CATCHPARM)
8997 if (ctype || in_namespace)
8998 error ("cannot use %<::%> in parameter declaration");
9000 /* A parameter declared as an array of T is really a pointer to T.
9001 One declared as a function is really a pointer to a function.
9002 One declared as a member is really a pointer to member. */
9004 if (TREE_CODE (type) == ARRAY_TYPE)
9006 /* Transfer const-ness of array into that of type pointed to. */
9007 type = build_pointer_type (TREE_TYPE (type));
9008 type_quals = TYPE_UNQUALIFIED;
9010 else if (TREE_CODE (type) == FUNCTION_TYPE)
9011 type = build_pointer_type (type);
9017 if (decl_context == PARM)
9019 decl = cp_build_parm_decl (unqualified_id, type);
9021 bad_specifiers (decl, "parameter", virtualp,
9022 memfn_quals != TYPE_UNQUALIFIED,
9023 inlinep, friendp, raises != NULL_TREE);
9025 else if (decl_context == FIELD)
9027 /* The C99 flexible array extension. */
9028 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9029 && TYPE_DOMAIN (type) == NULL_TREE)
9031 tree itype = compute_array_index_type (dname, integer_zero_node);
9032 type = build_cplus_array_type (TREE_TYPE (type), itype);
9035 if (type == error_mark_node)
9037 /* Happens when declaring arrays of sizes which
9038 are error_mark_node, for example. */
9041 else if (in_namespace && !friendp)
9043 /* Something like struct S { int N::j; }; */
9044 error ("invalid use of %<::%>");
9045 return error_mark_node;
9047 else if (TREE_CODE (type) == FUNCTION_TYPE)
9050 tree function_context;
9054 if (ctype == NULL_TREE)
9055 ctype = current_class_type;
9057 if (ctype == NULL_TREE)
9059 error ("can't make %qD into a method -- not in a class",
9061 return error_mark_node;
9064 /* ``A union may [ ... ] not [ have ] virtual functions.''
9066 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9068 error ("function %qD declared virtual inside a union",
9070 return error_mark_node;
9073 if (NEW_DELETE_OPNAME_P (unqualified_id))
9077 error ("%qD cannot be declared virtual, since it "
9083 else if (staticp < 2)
9084 type = build_memfn_type (type, ctype, memfn_quals);
9087 /* Check that the name used for a destructor makes sense. */
9088 if (sfk == sfk_destructor)
9090 tree uqname = id_declarator->u.id.unqualified_name;
9094 gcc_assert (friendp);
9095 error ("expected qualified name in friend declaration "
9096 "for destructor %qD", uqname);
9097 return error_mark_node;
9100 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9102 error ("declaration of %qD as member of %qT",
9104 return error_mark_node;
9107 else if (sfk == sfk_constructor && friendp)
9109 error ("expected qualified name in friend declaration "
9110 "for constructor %qD",
9111 id_declarator->u.id.unqualified_name);
9112 return error_mark_node;
9115 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9116 function_context = (ctype != NULL_TREE) ?
9117 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9118 publicp = (! friendp || ! staticp)
9119 && function_context == NULL_TREE;
9120 decl = grokfndecl (ctype, type,
9121 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9122 ? unqualified_id : dname,
9125 virtualp, flags, memfn_quals, raises,
9126 friendp ? -1 : 0, friendp, publicp, inlinep,
9128 funcdef_flag, template_count, in_namespace,
9129 attrlist, declarator->id_loc);
9130 if (decl == NULL_TREE)
9131 return error_mark_node;
9133 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9134 /* The decl and setting of decl_attr is also turned off. */
9135 decl = build_decl_attribute_variant (decl, decl_attr);
9138 /* [class.conv.ctor]
9140 A constructor declared without the function-specifier
9141 explicit that can be called with a single parameter
9142 specifies a conversion from the type of its first
9143 parameter to the type of its class. Such a constructor
9144 is called a converting constructor. */
9146 DECL_NONCONVERTING_P (decl) = 1;
9148 else if (TREE_CODE (type) == METHOD_TYPE)
9150 /* We only get here for friend declarations of
9151 members of other classes. */
9152 /* All method decls are public, so tell grokfndecl to set
9153 TREE_PUBLIC, also. */
9154 decl = grokfndecl (ctype, type,
9155 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9156 ? unqualified_id : dname,
9159 virtualp, flags, memfn_quals, raises,
9160 friendp ? -1 : 0, friendp, 1, 0, sfk,
9161 funcdef_flag, template_count, in_namespace,
9163 declarator->id_loc);
9164 if (decl == NULL_TREE)
9165 return error_mark_node;
9167 else if (!staticp && !dependent_type_p (type)
9168 && !COMPLETE_TYPE_P (complete_type (type))
9169 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9172 error ("field %qD has incomplete type", unqualified_id);
9174 error ("name %qT has incomplete type", type);
9176 /* If we're instantiating a template, tell them which
9177 instantiation made the field's type be incomplete. */
9178 if (current_class_type
9179 && TYPE_NAME (current_class_type)
9180 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9182 && declspecs->type == type)
9183 error (" in instantiation of template %qT",
9184 current_class_type);
9186 return error_mark_node;
9192 error ("%qE is neither function nor member function; "
9193 "cannot be declared friend", unqualified_id);
9201 /* Friends are treated specially. */
9202 if (ctype == current_class_type)
9203 ; /* We already issued a permerror. */
9204 else if (decl && DECL_NAME (decl))
9206 if (template_class_depth (current_class_type) == 0)
9208 decl = check_explicit_specialization
9209 (unqualified_id, decl, template_count,
9210 2 * funcdef_flag + 4);
9211 if (decl == error_mark_node)
9212 return error_mark_node;
9215 decl = do_friend (ctype, unqualified_id, decl,
9221 return error_mark_node;
9224 /* Structure field. It may not be a function, except for C++. */
9226 if (decl == NULL_TREE)
9232 /* An attempt is being made to initialize a non-static
9233 member. But, from [class.mem]:
9235 4 A member-declarator can contain a
9236 constant-initializer only if it declares a static
9237 member (_class.static_) of integral or enumeration
9238 type, see _class.static.data_.
9240 This used to be relatively common practice, but
9241 the rest of the compiler does not correctly
9242 handle the initialization unless the member is
9243 static so we make it static below. */
9244 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9246 permerror (input_location, "making %qD static", unqualified_id);
9250 if (uses_template_parms (type))
9251 /* We'll check at instantiation time. */
9253 else if (check_static_variable_definition (unqualified_id,
9255 /* If we just return the declaration, crashes
9256 will sometimes occur. We therefore return
9257 void_type_node, as if this was a friend
9258 declaration, to cause callers to completely
9259 ignore this declaration. */
9260 return error_mark_node;
9265 /* C++ allows static class members. All other work
9266 for this is done by grokfield. */
9267 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9268 set_linkage_for_static_data_member (decl);
9269 /* Even if there is an in-class initialization, DECL
9270 is considered undefined until an out-of-class
9271 definition is provided. */
9272 DECL_EXTERNAL (decl) = 1;
9275 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9279 decl = build_decl (FIELD_DECL, unqualified_id, type);
9280 DECL_NONADDRESSABLE_P (decl) = bitfield;
9281 if (bitfield && !unqualified_id)
9282 TREE_NO_WARNING (decl) = 1;
9284 if (storage_class == sc_mutable)
9286 DECL_MUTABLE_P (decl) = 1;
9287 storage_class = sc_none;
9291 bad_specifiers (decl, "field", virtualp,
9292 memfn_quals != TYPE_UNQUALIFIED,
9293 inlinep, friendp, raises != NULL_TREE);
9296 else if (TREE_CODE (type) == FUNCTION_TYPE
9297 || TREE_CODE (type) == METHOD_TYPE)
9302 if (!unqualified_id)
9303 return error_mark_node;
9305 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9306 original_name = dname;
9308 original_name = unqualified_id;
9310 if (storage_class == sc_auto)
9311 error ("storage class %<auto%> invalid for function %qs", name);
9312 else if (storage_class == sc_register)
9313 error ("storage class %<register%> invalid for function %qs", name);
9315 error ("storage class %<__thread%> invalid for function %qs", name);
9317 /* Function declaration not at top level.
9318 Storage classes other than `extern' are not allowed
9319 and `extern' makes no difference. */
9320 if (! toplevel_bindings_p ()
9321 && (storage_class == sc_static
9322 || declspecs->specs[(int)ds_inline])
9325 if (storage_class == sc_static)
9326 pedwarn (input_location, OPT_pedantic,
9327 "%<static%> specified invalid for function %qs "
9328 "declared out of global scope", name);
9330 pedwarn (input_location, OPT_pedantic,
9331 "%<inline%> specifier invalid for function %qs "
9332 "declared out of global scope", name);
9335 if (ctype != NULL_TREE
9336 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9338 error ("%q#T is not a class or a namespace", ctype);
9342 if (ctype == NULL_TREE)
9346 error ("virtual non-class function %qs", name);
9349 else if (sfk == sfk_constructor
9350 || sfk == sfk_destructor)
9353 ? "%qs defined in a non-class scope"
9354 : "%qs declared in a non-class scope", name);
9358 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9359 && !NEW_DELETE_OPNAME_P (original_name))
9360 type = build_method_type_directly (ctype,
9362 TYPE_ARG_TYPES (type));
9364 /* Record presence of `static'. */
9365 publicp = (ctype != NULL_TREE
9366 || storage_class == sc_extern
9367 || storage_class != sc_static);
9369 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9370 virtualp, flags, memfn_quals, raises,
9372 publicp, inlinep, sfk, funcdef_flag,
9373 template_count, in_namespace, attrlist,
9374 declarator->id_loc);
9375 if (decl == NULL_TREE)
9376 return error_mark_node;
9380 int invalid_static = 0;
9382 /* Don't allow a static member function in a class, and forbid
9383 declaring main to be static. */
9384 if (TREE_CODE (type) == METHOD_TYPE)
9386 permerror (input_location, "cannot declare member function %qD to have "
9387 "static linkage", decl);
9390 else if (current_function_decl)
9392 /* FIXME need arm citation */
9393 error ("cannot declare static function inside another function");
9400 storage_class = sc_none;
9406 /* It's a variable. */
9408 /* An uninitialized decl with `extern' is a reference. */
9409 decl = grokvardecl (type, unqualified_id,
9412 (type_quals & TYPE_QUAL_CONST) != 0,
9413 ctype ? ctype : in_namespace);
9414 bad_specifiers (decl, "variable", virtualp,
9415 memfn_quals != TYPE_UNQUALIFIED,
9416 inlinep, friendp, raises != NULL_TREE);
9420 DECL_CONTEXT (decl) = ctype;
9423 permerror (input_location, "%<static%> may not be used when defining "
9424 "(as opposed to declaring) a static data member");
9426 storage_class = sc_none;
9428 if (storage_class == sc_register && TREE_STATIC (decl))
9430 error ("static member %qD declared %<register%>", decl);
9431 storage_class = sc_none;
9433 if (storage_class == sc_extern && pedantic)
9435 pedwarn (input_location, OPT_pedantic,
9436 "cannot explicitly declare member %q#D to have "
9437 "extern linkage", decl);
9438 storage_class = sc_none;
9443 if (storage_class == sc_extern && initialized && !funcdef_flag)
9445 if (toplevel_bindings_p ())
9447 /* It's common practice (and completely valid) to have a const
9448 be initialized and declared extern. */
9449 if (!(type_quals & TYPE_QUAL_CONST))
9450 warning (0, "%qs initialized and declared %<extern%>", name);
9454 error ("%qs has both %<extern%> and initializer", name);
9455 return error_mark_node;
9459 /* Record `register' declaration for warnings on &
9460 and in case doing stupid register allocation. */
9462 if (storage_class == sc_register)
9463 DECL_REGISTER (decl) = 1;
9464 else if (storage_class == sc_extern)
9465 DECL_THIS_EXTERN (decl) = 1;
9466 else if (storage_class == sc_static)
9467 DECL_THIS_STATIC (decl) = 1;
9469 /* Record constancy and volatility on the DECL itself . There's
9470 no need to do this when processing a template; we'll do this
9471 for the instantiated declaration based on the type of DECL. */
9472 if (!processing_template_decl)
9473 cp_apply_type_quals_to_decl (type_quals, decl);
9476 TREE_NO_WARNING (decl) = 1;
9482 /* Subroutine of start_function. Ensure that each of the parameter
9483 types (as listed in PARMS) is complete, as is required for a
9484 function definition. */
9487 require_complete_types_for_parms (tree parms)
9489 for (; parms; parms = TREE_CHAIN (parms))
9491 if (dependent_type_p (TREE_TYPE (parms)))
9493 if (!VOID_TYPE_P (TREE_TYPE (parms))
9494 && complete_type_or_else (TREE_TYPE (parms), parms))
9496 relayout_decl (parms);
9497 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9500 /* grokparms or complete_type_or_else will have already issued
9502 TREE_TYPE (parms) = error_mark_node;
9506 /* Returns nonzero if T is a local variable. */
9509 local_variable_p (const_tree t)
9511 if ((TREE_CODE (t) == VAR_DECL
9512 /* A VAR_DECL with a context that is a _TYPE is a static data
9514 && !TYPE_P (CP_DECL_CONTEXT (t))
9515 /* Any other non-local variable must be at namespace scope. */
9516 && !DECL_NAMESPACE_SCOPE_P (t))
9517 || (TREE_CODE (t) == PARM_DECL))
9523 /* Like local_variable_p, but suitable for use as a tree-walking
9527 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9528 void *data ATTRIBUTE_UNUSED)
9530 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9532 else if (TYPE_P (*tp))
9539 /* Check that ARG, which is a default-argument expression for a
9540 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9541 something goes wrong. DECL may also be a _TYPE node, rather than a
9542 DECL, if there is no DECL available. */
9545 check_default_argument (tree decl, tree arg)
9550 if (TREE_CODE (arg) == DEFAULT_ARG)
9551 /* We get a DEFAULT_ARG when looking at an in-class declaration
9552 with a default argument. Ignore the argument for now; we'll
9553 deal with it after the class is complete. */
9562 decl_type = TREE_TYPE (decl);
9564 if (arg == error_mark_node
9565 || decl == error_mark_node
9566 || TREE_TYPE (arg) == error_mark_node
9567 || decl_type == error_mark_node)
9568 /* Something already went wrong. There's no need to check
9570 return error_mark_node;
9572 /* [dcl.fct.default]
9574 A default argument expression is implicitly converted to the
9576 if (!TREE_TYPE (arg)
9577 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9580 error ("default argument for %q#D has type %qT",
9581 decl, TREE_TYPE (arg));
9583 error ("default argument for parameter of type %qT has type %qT",
9584 decl_type, TREE_TYPE (arg));
9586 return error_mark_node;
9589 /* [dcl.fct.default]
9591 Local variables shall not be used in default argument
9594 The keyword `this' shall not be used in a default argument of a
9596 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9599 error ("default argument %qE uses local variable %qD", arg, var);
9600 return error_mark_node;
9607 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9610 type_is_deprecated (tree type)
9612 enum tree_code code;
9613 if (TREE_DEPRECATED (type))
9615 if (TYPE_NAME (type)
9616 && TREE_DEPRECATED (TYPE_NAME (type)))
9619 code = TREE_CODE (type);
9621 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9622 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9623 || code == METHOD_TYPE || code == ARRAY_TYPE)
9624 return type_is_deprecated (TREE_TYPE (type));
9626 if (TYPE_PTRMEMFUNC_P (type))
9627 return type_is_deprecated
9628 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9633 /* Decode the list of parameter types for a function type.
9634 Given the list of things declared inside the parens,
9635 return a list of types.
9637 If this parameter does not end with an ellipsis, we append
9640 *PARMS is set to the chain of PARM_DECLs created. */
9643 grokparms (tree parmlist, tree *parms)
9645 tree result = NULL_TREE;
9646 tree decls = NULL_TREE;
9650 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9652 tree type = NULL_TREE;
9653 tree init = TREE_PURPOSE (parm);
9654 tree decl = TREE_VALUE (parm);
9656 if (parm == void_list_node)
9659 if (! decl || TREE_TYPE (decl) == error_mark_node)
9662 type = TREE_TYPE (decl);
9663 if (VOID_TYPE_P (type))
9665 if (same_type_p (type, void_type_node)
9666 && DECL_SELF_REFERENCE_P (type)
9667 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9668 /* this is a parmlist of `(void)', which is ok. */
9670 cxx_incomplete_type_error (decl, type);
9671 /* It's not a good idea to actually create parameters of
9672 type `void'; other parts of the compiler assume that a
9673 void type terminates the parameter list. */
9674 type = error_mark_node;
9675 TREE_TYPE (decl) = error_mark_node;
9678 if (type != error_mark_node
9679 && TYPE_FOR_JAVA (type)
9680 && MAYBE_CLASS_TYPE_P (type))
9682 error ("parameter %qD has Java class type", decl);
9683 type = error_mark_node;
9684 TREE_TYPE (decl) = error_mark_node;
9688 if (type != error_mark_node)
9690 if (deprecated_state != DEPRECATED_SUPPRESS)
9692 tree deptype = type_is_deprecated (type);
9694 warn_deprecated_use (deptype);
9697 /* Top-level qualifiers on the parameters are
9698 ignored for function types. */
9699 type = cp_build_qualified_type (type, 0);
9700 if (TREE_CODE (type) == METHOD_TYPE)
9702 error ("parameter %qD invalidly declared method type", decl);
9703 type = build_pointer_type (type);
9704 TREE_TYPE (decl) = type;
9706 else if (abstract_virtuals_error (decl, type))
9707 any_error = 1; /* Seems like a good idea. */
9708 else if (POINTER_TYPE_P (type))
9710 /* [dcl.fct]/6, parameter types cannot contain pointers
9711 (references) to arrays of unknown bound. */
9712 tree t = TREE_TYPE (type);
9713 int ptr = TYPE_PTR_P (type);
9719 else if (TREE_CODE (t) != ARRAY_TYPE)
9721 else if (!TYPE_DOMAIN (t))
9725 if (TREE_CODE (t) == ARRAY_TYPE)
9726 error ("parameter %qD includes %s to array of unknown "
9728 decl, ptr ? "pointer" : "reference", t);
9733 else if (init && !processing_template_decl)
9734 init = check_default_argument (decl, init);
9737 if (TREE_CODE (decl) == PARM_DECL
9738 && FUNCTION_PARAMETER_PACK_P (decl)
9739 && TREE_CHAIN (parm)
9740 && TREE_CHAIN (parm) != void_list_node)
9741 error ("parameter packs must be at the end of the parameter list");
9743 TREE_CHAIN (decl) = decls;
9745 result = tree_cons (init, type, result);
9747 decls = nreverse (decls);
9748 result = nreverse (result);
9750 result = chainon (result, void_list_node);
9757 /* D is a constructor or overloaded `operator='.
9759 Let T be the class in which D is declared. Then, this function
9762 -1 if D's is an ill-formed constructor or copy assignment operator
9763 whose first parameter is of type `T'.
9764 0 if D is not a copy constructor or copy assignment
9766 1 if D is a copy constructor or copy assignment operator whose
9767 first parameter is a reference to const qualified T.
9768 2 if D is a copy constructor or copy assignment operator whose
9769 first parameter is a reference to non-const qualified T.
9771 This function can be used as a predicate. Positive values indicate
9772 a copy constructor and nonzero values indicate a copy assignment
9776 copy_fn_p (const_tree d)
9782 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9784 if (TREE_CODE (d) == TEMPLATE_DECL
9785 || (DECL_TEMPLATE_INFO (d)
9786 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9787 /* Instantiations of template member functions are never copy
9788 functions. Note that member functions of templated classes are
9789 represented as template functions internally, and we must
9790 accept those as copy functions. */
9793 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9797 arg_type = TREE_VALUE (args);
9798 if (arg_type == error_mark_node)
9801 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9803 /* Pass by value copy assignment operator. */
9806 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9807 && !TYPE_REF_IS_RVALUE (arg_type)
9808 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9810 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9816 args = TREE_CHAIN (args);
9818 if (args && args != void_list_node && !TREE_PURPOSE (args))
9819 /* There are more non-optional args. */
9825 /* D is a constructor or overloaded `operator='.
9827 Let T be the class in which D is declared. Then, this function
9828 returns true when D is a move constructor or move assignment
9829 operator, false otherwise. */
9832 move_fn_p (const_tree d)
9836 bool result = false;
9838 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9840 if (cxx_dialect == cxx98)
9841 /* There are no move constructors if we are in C++98 mode. */
9844 if (TREE_CODE (d) == TEMPLATE_DECL
9845 || (DECL_TEMPLATE_INFO (d)
9846 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9847 /* Instantiations of template member functions are never copy
9848 functions. Note that member functions of templated classes are
9849 represented as template functions internally, and we must
9850 accept those as copy functions. */
9853 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9857 arg_type = TREE_VALUE (args);
9858 if (arg_type == error_mark_node)
9861 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9862 && TYPE_REF_IS_RVALUE (arg_type)
9863 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9867 args = TREE_CHAIN (args);
9869 if (args && args != void_list_node && !TREE_PURPOSE (args))
9870 /* There are more non-optional args. */
9876 /* Remember any special properties of member function DECL. */
9879 grok_special_member_properties (tree decl)
9883 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9886 class_type = DECL_CONTEXT (decl);
9887 if (DECL_CONSTRUCTOR_P (decl))
9889 int ctor = copy_fn_p (decl);
9891 if (!DECL_ARTIFICIAL (decl))
9892 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9898 A non-template constructor for class X is a copy
9899 constructor if its first parameter is of type X&, const
9900 X&, volatile X& or const volatile X&, and either there
9901 are no other parameters or else all other parameters have
9902 default arguments. */
9903 TYPE_HAS_INIT_REF (class_type) = 1;
9904 if (!DECL_DEFAULTED_FN (decl))
9905 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9907 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9909 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9911 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9912 if (TREE_CODE (decl) == TEMPLATE_DECL || !DECL_DEFAULTED_FN (decl))
9913 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
9915 else if (is_list_ctor (decl))
9916 TYPE_HAS_LIST_CTOR (class_type) = 1;
9918 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9922 A non-template assignment operator for class X is a copy
9923 assignment operator if its parameter is of type X, X&, const
9924 X&, volatile X& or const volatile X&. */
9926 int assop = copy_fn_p (decl);
9930 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9931 if (!DECL_DEFAULTED_FN (decl))
9932 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9934 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9939 /* Check a constructor DECL has the correct form. Complains
9940 if the class has a constructor of the form X(X). */
9943 grok_ctor_properties (const_tree ctype, const_tree decl)
9945 int ctor_parm = copy_fn_p (decl);
9951 A declaration of a constructor for a class X is ill-formed if
9952 its first parameter is of type (optionally cv-qualified) X
9953 and either there are no other parameters or else all other
9954 parameters have default arguments.
9956 We *don't* complain about member template instantiations that
9957 have this form, though; they can occur as we try to decide
9958 what constructor to use during overload resolution. Since
9959 overload resolution will never prefer such a constructor to
9960 the non-template copy constructor (which is either explicitly
9961 or implicitly defined), there's no need to worry about their
9962 existence. Theoretically, they should never even be
9963 instantiated, but that's hard to forestall. */
9964 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9972 /* An operator with this code is unary, but can also be binary. */
9975 ambi_op_p (enum tree_code code)
9977 return (code == INDIRECT_REF
9978 || code == ADDR_EXPR
9979 || code == UNARY_PLUS_EXPR
9980 || code == NEGATE_EXPR
9981 || code == PREINCREMENT_EXPR
9982 || code == PREDECREMENT_EXPR);
9985 /* An operator with this name can only be unary. */
9988 unary_op_p (enum tree_code code)
9990 return (code == TRUTH_NOT_EXPR
9991 || code == BIT_NOT_EXPR
9992 || code == COMPONENT_REF
9993 || code == TYPE_EXPR);
9996 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9997 errors are issued for invalid declarations. */
10000 grok_op_properties (tree decl, bool complain)
10002 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10004 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10005 tree name = DECL_NAME (decl);
10006 enum tree_code operator_code;
10011 /* Count the number of arguments and check for ellipsis. */
10012 for (argtype = argtypes, arity = 0;
10013 argtype && argtype != void_list_node;
10014 argtype = TREE_CHAIN (argtype))
10016 ellipsis_p = !argtype;
10018 class_type = DECL_CONTEXT (decl);
10019 if (class_type && !CLASS_TYPE_P (class_type))
10020 class_type = NULL_TREE;
10022 if (DECL_CONV_FN_P (decl))
10023 operator_code = TYPE_EXPR;
10027 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10028 if (ansi_opname (CODE) == name) \
10030 operator_code = (CODE); \
10033 else if (ansi_assopname (CODE) == name) \
10035 operator_code = (CODE); \
10036 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10040 #include "operators.def"
10041 #undef DEF_OPERATOR
10043 gcc_unreachable ();
10046 gcc_assert (operator_code != MAX_TREE_CODES);
10047 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10050 switch (operator_code)
10053 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10057 TYPE_GETS_DELETE (class_type) |= 1;
10061 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10064 case VEC_DELETE_EXPR:
10065 TYPE_GETS_DELETE (class_type) |= 2;
10072 /* [basic.std.dynamic.allocation]/1:
10074 A program is ill-formed if an allocation function is declared
10075 in a namespace scope other than global scope or declared static
10078 The same also holds true for deallocation functions. */
10079 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10080 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10082 if (DECL_NAMESPACE_SCOPE_P (decl))
10084 if (CP_DECL_CONTEXT (decl) != global_namespace)
10086 error ("%qD may not be declared within a namespace", decl);
10089 else if (!TREE_PUBLIC (decl))
10091 error ("%qD may not be declared as static", decl);
10097 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10099 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10100 DECL_IS_OPERATOR_NEW (decl) = 1;
10102 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10103 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10106 /* An operator function must either be a non-static member function
10107 or have at least one parameter of a class, a reference to a class,
10108 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10109 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10111 if (operator_code == TYPE_EXPR
10112 || operator_code == CALL_EXPR
10113 || operator_code == COMPONENT_REF
10114 || operator_code == ARRAY_REF
10115 || operator_code == NOP_EXPR)
10117 error ("%qD must be a nonstatic member function", decl);
10124 if (DECL_STATIC_FUNCTION_P (decl))
10126 error ("%qD must be either a non-static member "
10127 "function or a non-member function", decl);
10131 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10133 tree arg = non_reference (TREE_VALUE (p));
10134 if (arg == error_mark_node)
10137 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10138 because these checks are performed even on
10139 template functions. */
10140 if (MAYBE_CLASS_TYPE_P (arg)
10141 || TREE_CODE (arg) == ENUMERAL_TYPE)
10145 if (!p || p == void_list_node)
10148 error ("%qD must have an argument of class or "
10149 "enumerated type", decl);
10155 /* There are no restrictions on the arguments to an overloaded
10157 if (operator_code == CALL_EXPR)
10160 /* Warn about conversion operators that will never be used. */
10161 if (IDENTIFIER_TYPENAME_P (name)
10162 && ! DECL_TEMPLATE_INFO (decl)
10164 /* Warn only declaring the function; there is no need to
10165 warn again about out-of-class definitions. */
10166 && class_type == current_class_type)
10168 tree t = TREE_TYPE (name);
10169 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10170 const char *what = 0;
10173 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10175 if (TREE_CODE (t) == VOID_TYPE)
10177 else if (class_type)
10179 if (t == class_type)
10180 what = "the same type";
10181 /* Don't force t to be complete here. */
10182 else if (MAYBE_CLASS_TYPE_P (t)
10183 && COMPLETE_TYPE_P (t)
10184 && DERIVED_FROM_P (t, class_type))
10185 what = "a base class";
10189 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10190 "conversion operator",
10191 ref ? "a reference to " : "", what);
10194 if (operator_code == COND_EXPR)
10197 error ("ISO C++ prohibits overloading operator ?:");
10200 else if (ellipsis_p)
10202 error ("%qD must not have variable number of arguments", decl);
10205 else if (ambi_op_p (operator_code))
10208 /* We pick the one-argument operator codes by default, so
10209 we don't have to change anything. */
10211 else if (arity == 2)
10213 /* If we thought this was a unary operator, we now know
10214 it to be a binary operator. */
10215 switch (operator_code)
10218 operator_code = MULT_EXPR;
10222 operator_code = BIT_AND_EXPR;
10225 case UNARY_PLUS_EXPR:
10226 operator_code = PLUS_EXPR;
10230 operator_code = MINUS_EXPR;
10233 case PREINCREMENT_EXPR:
10234 operator_code = POSTINCREMENT_EXPR;
10237 case PREDECREMENT_EXPR:
10238 operator_code = POSTDECREMENT_EXPR;
10242 gcc_unreachable ();
10245 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10247 if ((operator_code == POSTINCREMENT_EXPR
10248 || operator_code == POSTDECREMENT_EXPR)
10249 && ! processing_template_decl
10250 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10253 error ("postfix %qD must take %<int%> as its argument",
10256 error ("postfix %qD must take %<int%> as its second "
10264 error ("%qD must take either zero or one argument", decl);
10266 error ("%qD must take either one or two arguments", decl);
10270 /* More Effective C++ rule 6. */
10272 && (operator_code == POSTINCREMENT_EXPR
10273 || operator_code == POSTDECREMENT_EXPR
10274 || operator_code == PREINCREMENT_EXPR
10275 || operator_code == PREDECREMENT_EXPR))
10277 tree arg = TREE_VALUE (argtypes);
10278 tree ret = TREE_TYPE (TREE_TYPE (decl));
10279 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10280 arg = TREE_TYPE (arg);
10281 arg = TYPE_MAIN_VARIANT (arg);
10282 if (operator_code == PREINCREMENT_EXPR
10283 || operator_code == PREDECREMENT_EXPR)
10285 if (TREE_CODE (ret) != REFERENCE_TYPE
10286 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10288 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10289 build_reference_type (arg));
10293 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10294 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10298 else if (unary_op_p (operator_code))
10303 error ("%qD must take %<void%>", decl);
10305 error ("%qD must take exactly one argument", decl);
10309 else /* if (binary_op_p (operator_code)) */
10314 error ("%qD must take exactly one argument", decl);
10316 error ("%qD must take exactly two arguments", decl);
10320 /* More Effective C++ rule 7. */
10322 && (operator_code == TRUTH_ANDIF_EXPR
10323 || operator_code == TRUTH_ORIF_EXPR
10324 || operator_code == COMPOUND_EXPR))
10325 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10329 /* Effective C++ rule 23. */
10332 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10333 && (operator_code == PLUS_EXPR
10334 || operator_code == MINUS_EXPR
10335 || operator_code == TRUNC_DIV_EXPR
10336 || operator_code == MULT_EXPR
10337 || operator_code == TRUNC_MOD_EXPR)
10338 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10339 warning (OPT_Weffc__, "%qD should return by value", decl);
10341 /* [over.oper]/8 */
10342 for (; argtypes && argtypes != void_list_node;
10343 argtypes = TREE_CHAIN (argtypes))
10344 if (TREE_PURPOSE (argtypes))
10346 TREE_PURPOSE (argtypes) = NULL_TREE;
10347 if (operator_code == POSTINCREMENT_EXPR
10348 || operator_code == POSTDECREMENT_EXPR)
10350 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10355 error ("%qD cannot have default arguments", decl);
10363 /* Return a string giving the keyword associate with CODE. */
10365 static const char *
10366 tag_name (enum tag_types code)
10378 case typename_type:
10381 gcc_unreachable ();
10385 /* Name lookup in an elaborated-type-specifier (after the keyword
10386 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10387 elaborated-type-specifier is invalid, issue a diagnostic and return
10388 error_mark_node; otherwise, return the *_TYPE to which it referred.
10389 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10392 check_elaborated_type_specifier (enum tag_types tag_code,
10394 bool allow_template_p)
10400 struct S { struct S *p; };
10402 name lookup will find the TYPE_DECL for the implicit "S::S"
10403 typedef. Adjust for that here. */
10404 if (DECL_SELF_REFERENCE_P (decl))
10405 decl = TYPE_NAME (TREE_TYPE (decl));
10407 type = TREE_TYPE (decl);
10409 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10410 is false for this case as well. */
10411 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10413 error ("using template type parameter %qT after %qs",
10414 type, tag_name (tag_code));
10415 return error_mark_node;
10419 If the identifier resolves to a typedef-name or a template
10420 type-parameter, the elaborated-type-specifier is ill-formed.
10422 In other words, the only legitimate declaration to use in the
10423 elaborated type specifier is the implicit typedef created when
10424 the type is declared. */
10425 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10426 && tag_code != typename_type)
10428 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10429 error ("%q+D has a previous declaration here", decl);
10430 return error_mark_node;
10432 else if (TREE_CODE (type) != RECORD_TYPE
10433 && TREE_CODE (type) != UNION_TYPE
10434 && tag_code != enum_type
10435 && tag_code != typename_type)
10437 error ("%qT referred to as %qs", type, tag_name (tag_code));
10438 error ("%q+T has a previous declaration here", type);
10439 return error_mark_node;
10441 else if (TREE_CODE (type) != ENUMERAL_TYPE
10442 && tag_code == enum_type)
10444 error ("%qT referred to as enum", type);
10445 error ("%q+T has a previous declaration here", type);
10446 return error_mark_node;
10448 else if (!allow_template_p
10449 && TREE_CODE (type) == RECORD_TYPE
10450 && CLASSTYPE_IS_TEMPLATE (type))
10452 /* If a class template appears as elaborated type specifier
10453 without a template header such as:
10455 template <class T> class C {};
10456 void f(class C); // No template header here
10458 then the required template argument is missing. */
10459 error ("template argument required for %<%s %T%>",
10460 tag_name (tag_code),
10461 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10462 return error_mark_node;
10468 /* Lookup NAME in elaborate type specifier in scope according to
10469 SCOPE and issue diagnostics if necessary.
10470 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10471 found, and ERROR_MARK_NODE for type error. */
10474 lookup_and_check_tag (enum tag_types tag_code, tree name,
10475 tag_scope scope, bool template_header_p)
10479 if (scope == ts_global)
10481 /* First try ordinary name lookup, ignoring hidden class name
10482 injected via friend declaration. */
10483 decl = lookup_name_prefer_type (name, 2);
10484 /* If that fails, the name will be placed in the smallest
10485 non-class, non-function-prototype scope according to 3.3.1/5.
10486 We may already have a hidden name declared as friend in this
10487 scope. So lookup again but not ignoring hidden names.
10488 If we find one, that name will be made visible rather than
10489 creating a new tag. */
10491 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10494 decl = lookup_type_scope (name, scope);
10496 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10497 decl = DECL_TEMPLATE_RESULT (decl);
10499 if (decl && TREE_CODE (decl) == TYPE_DECL)
10501 /* Look for invalid nested type:
10505 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10507 error ("%qD has the same name as the class in which it is "
10510 return error_mark_node;
10513 /* Two cases we need to consider when deciding if a class
10514 template is allowed as an elaborated type specifier:
10515 1. It is a self reference to its own class.
10516 2. It comes with a template header.
10520 template <class T> class C {
10521 class C *c1; // DECL_SELF_REFERENCE_P is true
10524 template <class U> class C; // template_header_p is true
10525 template <class T> class C<T>::D {
10526 class C *c2; // DECL_SELF_REFERENCE_P is true
10529 t = check_elaborated_type_specifier (tag_code,
10532 | DECL_SELF_REFERENCE_P (decl));
10535 else if (decl && TREE_CODE (decl) == TREE_LIST)
10537 error ("reference to %qD is ambiguous", name);
10538 print_candidates (decl);
10539 return error_mark_node;
10545 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10546 Define the tag as a forward-reference if it is not defined.
10548 If a declaration is given, process it here, and report an error if
10549 multiple declarations are not identical.
10551 SCOPE is TS_CURRENT when this is also a definition. Only look in
10552 the current frame for the name (since C++ allows new names in any
10553 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10554 declaration. Only look beginning from the current scope outward up
10555 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10557 TEMPLATE_HEADER_P is true when this declaration is preceded by
10558 a set of template parameters. */
10561 xref_tag (enum tag_types tag_code, tree name,
10562 tag_scope scope, bool template_header_p)
10564 enum tree_code code;
10566 tree context = NULL_TREE;
10568 timevar_push (TV_NAME_LOOKUP);
10570 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10576 code = RECORD_TYPE;
10582 code = ENUMERAL_TYPE;
10585 gcc_unreachable ();
10588 /* In case of anonymous name, xref_tag is only called to
10589 make type node and push name. Name lookup is not required. */
10590 if (ANON_AGGRNAME_P (name))
10593 t = lookup_and_check_tag (tag_code, name,
10594 scope, template_header_p);
10596 if (t == error_mark_node)
10597 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10599 if (scope != ts_current && t && current_class_type
10600 && template_class_depth (current_class_type)
10601 && template_header_p)
10603 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10604 definition of this tag. Since, in addition, we are currently
10605 processing a (member) template declaration of a template
10606 class, we must be very careful; consider:
10613 { template <class V>
10614 friend struct S1; };
10616 Here, the S2::S1 declaration should not be confused with the
10617 outer declaration. In particular, the inner version should
10618 have a template parameter of level 2, not level 1. This
10619 would be particularly important if the member declaration
10622 template <class V = U> friend struct S1;
10624 say, when we should tsubst into `U' when instantiating
10625 S2. On the other hand, when presented with:
10635 we must find the inner binding eventually. We
10636 accomplish this by making sure that the new type we
10637 create to represent this declaration has the right
10639 context = TYPE_CONTEXT (t);
10645 /* If no such tag is yet defined, create a forward-reference node
10646 and record it as the "definition".
10647 When a real declaration of this type is found,
10648 the forward-reference will be altered into a real type. */
10649 if (code == ENUMERAL_TYPE)
10651 error ("use of enum %q#D without previous declaration", name);
10652 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10656 t = make_class_type (code);
10657 TYPE_CONTEXT (t) = context;
10658 t = pushtag (name, t, scope);
10663 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10665 if (!redeclare_class_template (t, current_template_parms))
10666 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10668 else if (!processing_template_decl
10669 && CLASS_TYPE_P (t)
10670 && CLASSTYPE_IS_TEMPLATE (t))
10672 error ("redeclaration of %qT as a non-template", t);
10673 error ("previous declaration %q+D", t);
10674 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10677 /* Make injected friend class visible. */
10678 if (scope != ts_within_enclosing_non_class
10679 && hidden_name_p (TYPE_NAME (t)))
10681 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10682 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10684 if (TYPE_TEMPLATE_INFO (t))
10686 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10687 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10692 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10696 xref_tag_from_type (tree old, tree id, tag_scope scope)
10698 enum tag_types tag_kind;
10700 if (TREE_CODE (old) == RECORD_TYPE)
10701 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10703 tag_kind = union_type;
10705 if (id == NULL_TREE)
10706 id = TYPE_IDENTIFIER (old);
10708 return xref_tag (tag_kind, id, scope, false);
10711 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10712 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10713 access_* node, and the TREE_VALUE is the type of the base-class.
10714 Non-NULL TREE_TYPE indicates virtual inheritance.
10716 Returns true if the binfo hierarchy was successfully created,
10717 false if an error was detected. */
10720 xref_basetypes (tree ref, tree base_list)
10723 tree binfo, base_binfo;
10724 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10725 unsigned max_bases = 0; /* Maximum direct bases. */
10727 tree default_access;
10728 tree igo_prev; /* Track Inheritance Graph Order. */
10730 if (ref == error_mark_node)
10733 /* The base of a derived class is private by default, all others are
10735 default_access = (TREE_CODE (ref) == RECORD_TYPE
10736 && CLASSTYPE_DECLARED_CLASS (ref)
10737 ? access_private_node : access_public_node);
10739 /* First, make sure that any templates in base-classes are
10740 instantiated. This ensures that if we call ourselves recursively
10741 we do not get confused about which classes are marked and which
10743 basep = &base_list;
10746 tree basetype = TREE_VALUE (*basep);
10748 if (!(processing_template_decl && uses_template_parms (basetype))
10749 && !complete_type_or_else (basetype, NULL))
10750 /* An incomplete type. Remove it from the list. */
10751 *basep = TREE_CHAIN (*basep);
10755 if (TREE_TYPE (*basep))
10757 if (CLASS_TYPE_P (basetype))
10758 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10759 basep = &TREE_CHAIN (*basep);
10763 TYPE_MARKED_P (ref) = 1;
10765 /* The binfo slot should be empty, unless this is an (ill-formed)
10767 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10768 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10770 binfo = make_tree_binfo (max_bases);
10772 TYPE_BINFO (ref) = binfo;
10773 BINFO_OFFSET (binfo) = size_zero_node;
10774 BINFO_TYPE (binfo) = ref;
10778 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10779 /* An aggregate cannot have baseclasses. */
10780 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10782 if (TREE_CODE (ref) == UNION_TYPE)
10784 error ("derived union %qT invalid", ref);
10791 if (TYPE_FOR_JAVA (ref))
10793 error ("Java class %qT cannot have multiple bases", ref);
10800 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10802 if (TYPE_FOR_JAVA (ref))
10804 error ("Java class %qT cannot have virtual bases", ref);
10809 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10811 tree access = TREE_PURPOSE (base_list);
10812 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10813 tree basetype = TREE_VALUE (base_list);
10815 if (access == access_default_node)
10816 access = default_access;
10818 if (PACK_EXPANSION_P (basetype))
10819 basetype = PACK_EXPANSION_PATTERN (basetype);
10820 if (TREE_CODE (basetype) == TYPE_DECL)
10821 basetype = TREE_TYPE (basetype);
10822 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10824 error ("base type %qT fails to be a struct or class type",
10829 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10830 TYPE_FOR_JAVA (ref) = 1;
10832 base_binfo = NULL_TREE;
10833 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10835 base_binfo = TYPE_BINFO (basetype);
10836 /* The original basetype could have been a typedef'd type. */
10837 basetype = BINFO_TYPE (base_binfo);
10839 /* Inherit flags from the base. */
10840 TYPE_HAS_NEW_OPERATOR (ref)
10841 |= TYPE_HAS_NEW_OPERATOR (basetype);
10842 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10843 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10844 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10845 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10846 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10847 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10848 CLASSTYPE_REPEATED_BASE_P (ref)
10849 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10852 /* We must do this test after we've seen through a typedef
10854 if (TYPE_MARKED_P (basetype))
10856 if (basetype == ref)
10857 error ("recursive type %qT undefined", basetype);
10859 error ("duplicate base type %qT invalid", basetype);
10863 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10864 /* Regenerate the pack expansion for the bases. */
10865 basetype = make_pack_expansion (basetype);
10867 TYPE_MARKED_P (basetype) = 1;
10869 base_binfo = copy_binfo (base_binfo, basetype, ref,
10870 &igo_prev, via_virtual);
10871 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10872 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10874 BINFO_BASE_APPEND (binfo, base_binfo);
10875 BINFO_BASE_ACCESS_APPEND (binfo, access);
10878 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10879 /* If we have space in the vbase vector, we must have shared at
10880 least one of them, and are therefore diamond shaped. */
10881 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10883 /* Unmark all the types. */
10884 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10885 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10886 TYPE_MARKED_P (ref) = 0;
10888 /* Now see if we have a repeated base type. */
10889 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10891 for (base_binfo = binfo; base_binfo;
10892 base_binfo = TREE_CHAIN (base_binfo))
10894 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10896 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10899 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10901 for (base_binfo = binfo; base_binfo;
10902 base_binfo = TREE_CHAIN (base_binfo))
10903 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10904 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10913 /* Begin compiling the definition of an enumeration type.
10916 UNDERLYING_TYPE is the type that will be used as the storage for
10917 the enumeration type. This should be NULL_TREE if no storage type
10920 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10922 Returns the type object, as yet incomplete.
10923 Also records info about it so that build_enumerator
10924 may be used to declare the individual values as they are read. */
10927 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10931 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10933 /* If this is the real definition for a previous forward reference,
10934 fill in the contents in the same object that used to be the
10935 forward reference. */
10937 enumtype = lookup_and_check_tag (enum_type, name,
10938 /*tag_scope=*/ts_current,
10939 /*template_header_p=*/false);
10941 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10943 error ("multiple definition of %q#T", enumtype);
10944 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10945 /* Clear out TYPE_VALUES, and start again. */
10946 TYPE_VALUES (enumtype) = NULL_TREE;
10950 /* In case of error, make a dummy enum to allow parsing to
10952 if (enumtype == error_mark_node)
10953 name = make_anon_name ();
10955 enumtype = make_node (ENUMERAL_TYPE);
10956 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10959 if (enumtype == error_mark_node)
10964 SET_SCOPED_ENUM_P (enumtype, 1);
10965 begin_scope (sk_scoped_enum, enumtype);
10967 /* [C++0x dcl.enum]p5:
10969 If not explicitly specified, the underlying type of a scoped
10970 enumeration type is int. */
10971 if (!underlying_type)
10972 underlying_type = integer_type_node;
10975 if (underlying_type)
10977 if (CP_INTEGRAL_TYPE_P (underlying_type))
10979 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10980 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10981 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10982 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10983 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
10984 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10985 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10986 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10987 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10988 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10991 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10992 underlying_type, enumtype);
10998 /* After processing and defining all the values of an enumeration type,
10999 install their decls in the enumeration type and finish it off.
11000 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11003 finish_enum (tree enumtype)
11012 bool use_short_enum;
11016 integer_type_kind itk;
11017 tree underlying_type = NULL_TREE;
11018 bool fixed_underlying_type_p
11019 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11021 /* We built up the VALUES in reverse order. */
11022 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11024 /* For an enum defined in a template, just set the type of the values;
11025 all further processing is postponed until the template is
11026 instantiated. We need to set the type so that tsubst of a CONST_DECL
11028 if (processing_template_decl)
11030 for (values = TYPE_VALUES (enumtype);
11032 values = TREE_CHAIN (values))
11033 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11034 if (at_function_scope_p ())
11035 add_stmt (build_min (TAG_DEFN, enumtype));
11039 /* Determine the minimum and maximum values of the enumerators. */
11040 if (TYPE_VALUES (enumtype))
11042 minnode = maxnode = NULL_TREE;
11044 for (values = TYPE_VALUES (enumtype);
11046 values = TREE_CHAIN (values))
11048 decl = TREE_VALUE (values);
11050 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11051 each enumerator has the type of its enumeration. Prior to the
11052 closing brace, the type of each enumerator is the type of its
11053 initializing value. */
11054 TREE_TYPE (decl) = enumtype;
11056 /* Update the minimum and maximum values, if appropriate. */
11057 value = DECL_INITIAL (decl);
11058 if (value == error_mark_node)
11059 value = integer_zero_node;
11060 /* Figure out what the minimum and maximum values of the
11061 enumerators are. */
11063 minnode = maxnode = value;
11064 else if (tree_int_cst_lt (maxnode, value))
11066 else if (tree_int_cst_lt (value, minnode))
11073 If the enumerator-list is empty, the underlying type is as if
11074 the enumeration had a single enumerator with value 0. */
11075 minnode = maxnode = integer_zero_node;
11077 /* Compute the number of bits require to represent all values of the
11078 enumeration. We must do this before the type of MINNODE and
11079 MAXNODE are transformed, since tree_int_cst_min_precision relies
11080 on the TREE_TYPE of the value it is passed. */
11081 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11082 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11083 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11084 precision = MAX (lowprec, highprec);
11086 if (!fixed_underlying_type_p)
11088 /* Determine the underlying type of the enumeration.
11092 The underlying type of an enumeration is an integral type that
11093 can represent all the enumerator values defined in the
11094 enumeration. It is implementation-defined which integral type is
11095 used as the underlying type for an enumeration except that the
11096 underlying type shall not be larger than int unless the value of
11097 an enumerator cannot fit in an int or unsigned int.
11099 We use "int" or an "unsigned int" as the underlying type, even if
11100 a smaller integral type would work, unless the user has
11101 explicitly requested that we use the smallest possible type. The
11102 user can request that for all enumerations with a command line
11103 flag, or for just one enumeration with an attribute. */
11105 use_short_enum = flag_short_enums
11106 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11108 for (itk = (use_short_enum ? itk_char : itk_int);
11112 underlying_type = integer_types[itk];
11113 if (TYPE_PRECISION (underlying_type) >= precision
11114 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11117 if (itk == itk_none)
11121 IF no integral type can represent all the enumerator values, the
11122 enumeration is ill-formed. */
11123 error ("no integral type can represent all of the enumerator values "
11124 "for %qT", enumtype);
11125 precision = TYPE_PRECISION (long_long_integer_type_node);
11126 underlying_type = integer_types[itk_unsigned_long_long];
11131 The value of sizeof() applied to an enumeration type, an object
11132 of an enumeration type, or an enumerator, is the value of sizeof()
11133 applied to the underlying type. */
11134 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11135 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11136 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11137 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11138 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11139 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11141 /* Set the underlying type of the enumeration type to the
11142 computed enumeration type, restricted to the enumerator
11144 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
11145 set_min_and_max_values_for_integral_type
11146 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11149 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11151 /* Compute the minimum and maximum values for the type.
11155 For an enumeration where emin is the smallest enumerator and emax
11156 is the largest, the values of the enumeration are the values of the
11157 underlying type in the range bmin to bmax, where bmin and bmax are,
11158 respectively, the smallest and largest values of the smallest bit-
11159 field that can store emin and emax. */
11161 /* The middle-end currently assumes that types with TYPE_PRECISION
11162 narrower than their underlying type are suitably zero or sign
11163 extended to fill their mode. g++ doesn't make these guarantees.
11164 Until the middle-end can represent such paradoxical types, we
11165 set the TYPE_PRECISION to the width of the underlying type. */
11166 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11168 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11170 /* Convert each of the enumerators to the type of the underlying
11171 type of the enumeration. */
11172 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11174 location_t saved_location;
11176 decl = TREE_VALUE (values);
11177 saved_location = input_location;
11178 input_location = DECL_SOURCE_LOCATION (decl);
11179 if (fixed_underlying_type_p)
11180 /* If the enumeration type has a fixed underlying type, we
11181 already checked all of the enumerator values. */
11182 value = DECL_INITIAL (decl);
11184 value = perform_implicit_conversion (underlying_type,
11185 DECL_INITIAL (decl),
11186 tf_warning_or_error);
11187 input_location = saved_location;
11189 /* Do not clobber shared ints. */
11190 value = copy_node (value);
11192 TREE_TYPE (value) = enumtype;
11193 DECL_INITIAL (decl) = value;
11196 /* Fix up all variant types of this enum type. */
11197 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11199 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11200 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11201 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11202 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11203 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11204 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11205 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11206 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11207 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11208 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11209 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11212 /* Finish up the scope of a scoped enumeration. */
11213 if (SCOPED_ENUM_P (enumtype))
11216 /* Finish debugging output for this type. */
11217 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11220 /* Build and install a CONST_DECL for an enumeration constant of the
11221 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11222 Assignment of sequential values by default is handled here. */
11225 build_enumerator (tree name, tree value, tree enumtype)
11231 /* If the VALUE was erroneous, pretend it wasn't there; that will
11232 result in the enum being assigned the next value in sequence. */
11233 if (value == error_mark_node)
11236 /* Remove no-op casts from the value. */
11238 STRIP_TYPE_NOPS (value);
11240 if (! processing_template_decl)
11242 /* Validate and default VALUE. */
11243 if (value != NULL_TREE)
11245 value = integral_constant_value (value);
11247 if (TREE_CODE (value) == INTEGER_CST)
11249 value = perform_integral_promotions (value);
11250 constant_expression_warning (value);
11254 error ("enumerator value for %qD is not an integer constant", name);
11259 /* Default based on previous value. */
11260 if (value == NULL_TREE)
11262 if (TYPE_VALUES (enumtype))
11265 unsigned HOST_WIDE_INT lo;
11269 /* The next value is the previous value plus one.
11270 add_double doesn't know the type of the target expression,
11271 so we must check with int_fits_type_p as well. */
11272 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11273 if (error_operand_p (prev_value))
11274 value = error_mark_node;
11277 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11278 TREE_INT_CST_HIGH (prev_value),
11280 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11282 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11286 error ("overflow in enumeration values at %qD", name);
11287 value = error_mark_node;
11292 value = integer_zero_node;
11295 /* Remove no-op casts from the value. */
11296 STRIP_TYPE_NOPS (value);
11298 /* If the underlying type of the enum is fixed, check whether
11299 the enumerator values fits in the underlying type. If it
11300 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11301 if (ENUM_UNDERLYING_TYPE (enumtype)
11303 && TREE_CODE (value) == INTEGER_CST
11304 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11306 error ("enumerator value %E is too large for underlying type %<%T%>",
11307 value, ENUM_UNDERLYING_TYPE (enumtype));
11309 /* Silently convert the value so that we can continue. */
11310 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11315 /* C++ associates enums with global, function, or class declarations. */
11316 context = current_scope ();
11318 /* Build the actual enumeration constant. Note that the enumeration
11319 constants have the underlying type of the enum (if it is fixed)
11320 or the type of their initializer (if the underlying type of the
11321 enum is not fixed):
11325 If the underlying type is fixed, the type of each enumerator
11326 prior to the closing brace is the underlying type; if the
11327 initializing value of an enumerator cannot be represented by
11328 the underlying type, the program is ill-formed. If the
11329 underlying type is not fixed, the type of each enumerator is
11330 the type of its initializing value.
11332 If the underlying type is not fixed, it will be computed by
11333 finish_enum and we will reset the type of this enumerator. Of
11334 course, if we're processing a template, there may be no value. */
11335 type = value ? TREE_TYPE (value) : NULL_TREE;
11337 if (context && context == current_class_type)
11338 /* This enum declaration is local to the class. We need the full
11339 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11340 decl = build_lang_decl (CONST_DECL, name, type);
11342 /* It's a global enum, or it's local to a function. (Note local to
11343 a function could mean local to a class method. */
11344 decl = build_decl (CONST_DECL, name, type);
11346 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11347 TREE_CONSTANT (decl) = 1;
11348 TREE_READONLY (decl) = 1;
11349 DECL_INITIAL (decl) = value;
11351 if (context && context == current_class_type)
11352 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11353 on the TYPE_FIELDS list for `S'. (That's so that you can say
11354 things like `S::i' later.) */
11355 finish_member_declaration (decl);
11359 /* Add this enumeration constant to the list for this type. */
11360 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11363 /* Look for an enumerator with the given NAME within the enumeration
11364 type ENUMTYPE. This routine is used primarily for qualified name
11365 lookup into an enumerator in C++0x, e.g.,
11367 enum class Color { Red, Green, Blue };
11369 Color color = Color::Red;
11371 Returns the value corresponding to the enumerator, or
11372 NULL_TREE if no such enumerator was found. */
11374 lookup_enumerator (tree enumtype, tree name)
11377 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11379 e = purpose_member (name, TYPE_VALUES (enumtype));
11380 return e? TREE_VALUE (e) : NULL_TREE;
11384 /* We're defining DECL. Make sure that it's type is OK. */
11387 check_function_type (tree decl, tree current_function_parms)
11389 tree fntype = TREE_TYPE (decl);
11390 tree return_type = complete_type (TREE_TYPE (fntype));
11392 /* In a function definition, arg types must be complete. */
11393 require_complete_types_for_parms (current_function_parms);
11395 if (dependent_type_p (return_type))
11397 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11398 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11400 tree args = TYPE_ARG_TYPES (fntype);
11402 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11403 error ("return type %q#T is incomplete", return_type);
11405 error ("return type has Java class type %q#T", return_type);
11407 /* Make it return void instead. */
11408 if (TREE_CODE (fntype) == METHOD_TYPE)
11409 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11411 TREE_CHAIN (args));
11413 fntype = build_function_type (void_type_node, args);
11415 = build_exception_variant (fntype,
11416 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11419 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11422 /* Create the FUNCTION_DECL for a function definition.
11423 DECLSPECS and DECLARATOR are the parts of the declaration;
11424 they describe the function's name and the type it returns,
11425 but twisted together in a fashion that parallels the syntax of C.
11427 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11428 DECLARATOR is really the DECL for the function we are about to
11429 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11430 indicating that the function is an inline defined in-class.
11432 This function creates a binding context for the function body
11433 as well as setting up the FUNCTION_DECL in current_function_decl.
11435 For C++, we must first check whether that datum makes any sense.
11436 For example, "class A local_a(1,2);" means that variable local_a
11437 is an aggregate of type A, which should have a constructor
11438 applied to it with the argument list [1, 2].
11440 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11441 or may be a BLOCK if the function has been defined previously
11442 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11443 error_mark_node if the function has never been defined, or
11444 a BLOCK if the function has been defined somewhere. */
11447 start_preparsed_function (tree decl1, tree attrs, int flags)
11449 tree ctype = NULL_TREE;
11452 int doing_friend = 0;
11453 struct cp_binding_level *bl;
11454 tree current_function_parms;
11455 struct c_fileinfo *finfo
11456 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11457 bool honor_interface;
11459 /* Sanity check. */
11460 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11461 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11463 fntype = TREE_TYPE (decl1);
11464 if (TREE_CODE (fntype) == METHOD_TYPE)
11465 ctype = TYPE_METHOD_BASETYPE (fntype);
11467 /* ISO C++ 11.4/5. A friend function defined in a class is in
11468 the (lexical) scope of the class in which it is defined. */
11469 if (!ctype && DECL_FRIEND_P (decl1))
11471 ctype = DECL_FRIEND_CONTEXT (decl1);
11473 /* CTYPE could be null here if we're dealing with a template;
11474 for example, `inline friend float foo()' inside a template
11475 will have no CTYPE set. */
11476 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11482 if (DECL_DECLARED_INLINE_P (decl1)
11483 && lookup_attribute ("noinline", attrs))
11484 warning (0, "inline function %q+D given attribute noinline", decl1);
11486 /* Handle gnu_inline attribute. */
11487 if (GNU_INLINE_P (decl1))
11489 DECL_EXTERNAL (decl1) = 1;
11490 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11491 DECL_INTERFACE_KNOWN (decl1) = 1;
11492 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11495 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11496 /* This is a constructor, we must ensure that any default args
11497 introduced by this definition are propagated to the clones
11498 now. The clones are used directly in overload resolution. */
11499 adjust_clone_args (decl1);
11501 /* Sometimes we don't notice that a function is a static member, and
11502 build a METHOD_TYPE for it. Fix that up now. */
11503 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11504 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11506 revert_static_member_fn (decl1);
11510 /* Set up current_class_type, and enter the scope of the class, if
11513 push_nested_class (ctype);
11514 else if (DECL_STATIC_FUNCTION_P (decl1))
11515 push_nested_class (DECL_CONTEXT (decl1));
11517 /* Now that we have entered the scope of the class, we must restore
11518 the bindings for any template parameters surrounding DECL1, if it
11519 is an inline member template. (Order is important; consider the
11520 case where a template parameter has the same name as a field of
11521 the class.) It is not until after this point that
11522 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11523 if (flags & SF_INCLASS_INLINE)
11524 maybe_begin_member_template_processing (decl1);
11526 /* Effective C++ rule 15. */
11528 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11529 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11530 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11532 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11533 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11534 if (!DECL_INITIAL (decl1))
11535 DECL_INITIAL (decl1) = error_mark_node;
11537 /* This function exists in static storage.
11538 (This does not mean `static' in the C sense!) */
11539 TREE_STATIC (decl1) = 1;
11541 /* We must call push_template_decl after current_class_type is set
11542 up. (If we are processing inline definitions after exiting a
11543 class scope, current_class_type will be NULL_TREE until set above
11544 by push_nested_class.) */
11545 if (processing_template_decl)
11547 /* FIXME: Handle error_mark_node more gracefully. */
11548 tree newdecl1 = push_template_decl (decl1);
11549 if (newdecl1 != error_mark_node)
11553 /* We are now in the scope of the function being defined. */
11554 current_function_decl = decl1;
11556 /* Save the parm names or decls from this function's declarator
11557 where store_parm_decls will find them. */
11558 current_function_parms = DECL_ARGUMENTS (decl1);
11560 /* Make sure the parameter and return types are reasonable. When
11561 you declare a function, these types can be incomplete, but they
11562 must be complete when you define the function. */
11563 check_function_type (decl1, current_function_parms);
11565 /* Build the return declaration for the function. */
11566 restype = TREE_TYPE (fntype);
11567 if (DECL_RESULT (decl1) == NULL_TREE)
11571 resdecl = build_decl (RESULT_DECL, 0, restype);
11572 DECL_ARTIFICIAL (resdecl) = 1;
11573 DECL_IGNORED_P (resdecl) = 1;
11574 DECL_RESULT (decl1) = resdecl;
11576 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11579 /* Let the user know we're compiling this function. */
11580 announce_function (decl1);
11582 /* Record the decl so that the function name is defined.
11583 If we already have a decl for this name, and it is a FUNCTION_DECL,
11584 use the old decl. */
11585 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11587 /* A specialization is not used to guide overload resolution. */
11588 if (!DECL_FUNCTION_MEMBER_P (decl1)
11589 && !(DECL_USE_TEMPLATE (decl1) &&
11590 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11592 tree olddecl = pushdecl (decl1);
11594 if (olddecl == error_mark_node)
11595 /* If something went wrong when registering the declaration,
11596 use DECL1; we have to have a FUNCTION_DECL to use when
11597 parsing the body of the function. */
11601 /* Otherwise, OLDDECL is either a previous declaration
11602 of the same function or DECL1 itself. */
11604 if (warn_missing_declarations
11605 && olddecl == decl1
11606 && !DECL_MAIN_P (decl1)
11607 && TREE_PUBLIC (decl1)
11608 && !DECL_DECLARED_INLINE_P (decl1))
11612 /* Check whether DECL1 is in an anonymous
11614 for (context = DECL_CONTEXT (decl1);
11616 context = DECL_CONTEXT (context))
11618 if (TREE_CODE (context) == NAMESPACE_DECL
11619 && DECL_NAME (context) == NULL_TREE)
11623 if (context == NULL)
11624 warning (OPT_Wmissing_declarations,
11625 "no previous declaration for %q+D", decl1);
11633 /* We need to set the DECL_CONTEXT. */
11634 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11635 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11637 fntype = TREE_TYPE (decl1);
11639 /* If #pragma weak applies, mark the decl appropriately now.
11640 The pragma only applies to global functions. Because
11641 determining whether or not the #pragma applies involves
11642 computing the mangled name for the declaration, we cannot
11643 apply the pragma until after we have merged this declaration
11644 with any previous declarations; if the original declaration
11645 has a linkage specification, that specification applies to
11646 the definition as well, and may affect the mangled name. */
11647 if (!DECL_CONTEXT (decl1))
11648 maybe_apply_pragma_weak (decl1);
11651 /* Reset this in case the call to pushdecl changed it. */
11652 current_function_decl = decl1;
11654 gcc_assert (DECL_INITIAL (decl1));
11656 /* This function may already have been parsed, in which case just
11657 return; our caller will skip over the body without parsing. */
11658 if (DECL_INITIAL (decl1) != error_mark_node)
11661 /* Initialize RTL machinery. We cannot do this until
11662 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11663 even when processing a template; this is how we get
11664 CFUN set up, and our per-function variables initialized.
11665 FIXME factor out the non-RTL stuff. */
11666 bl = current_binding_level;
11667 allocate_struct_function (decl1, processing_template_decl);
11669 /* Initialize the language data structures. Whenever we start
11670 a new function, we destroy temporaries in the usual way. */
11671 cfun->language = GGC_CNEW (struct language_function);
11672 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11673 current_binding_level = bl;
11675 /* Even though we're inside a function body, we still don't want to
11676 call expand_expr to calculate the size of a variable-sized array.
11677 We haven't necessarily assigned RTL to all variables yet, so it's
11678 not safe to try to expand expressions involving them. */
11679 cfun->dont_save_pending_sizes_p = 1;
11681 /* Start the statement-tree, start the tree now. */
11682 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11684 /* If we are (erroneously) defining a function that we have already
11685 defined before, wipe out what we knew before. */
11686 if (!DECL_PENDING_INLINE_P (decl1))
11687 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11689 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11691 /* We know that this was set up by `grokclassfn'. We do not
11692 wait until `store_parm_decls', since evil parse errors may
11693 never get us to that point. Here we keep the consistency
11694 between `current_class_type' and `current_class_ptr'. */
11695 tree t = DECL_ARGUMENTS (decl1);
11697 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11698 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11700 cp_function_chain->x_current_class_ref
11701 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11702 cp_function_chain->x_current_class_ptr = t;
11704 /* Constructors and destructors need to know whether they're "in
11705 charge" of initializing virtual base classes. */
11706 t = TREE_CHAIN (t);
11707 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11709 current_in_charge_parm = t;
11710 t = TREE_CHAIN (t);
11712 if (DECL_HAS_VTT_PARM_P (decl1))
11714 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11715 current_vtt_parm = t;
11719 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11720 /* Implicitly-defined methods (like the
11721 destructor for a class in which no destructor
11722 is explicitly declared) must not be defined
11723 until their definition is needed. So, we
11724 ignore interface specifications for
11725 compiler-generated functions. */
11726 && !DECL_ARTIFICIAL (decl1));
11728 if (DECL_INTERFACE_KNOWN (decl1))
11730 tree ctx = decl_function_context (decl1);
11732 if (DECL_NOT_REALLY_EXTERN (decl1))
11733 DECL_EXTERNAL (decl1) = 0;
11735 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11736 && TREE_PUBLIC (ctx))
11737 /* This is a function in a local class in an extern inline
11739 comdat_linkage (decl1);
11741 /* If this function belongs to an interface, it is public.
11742 If it belongs to someone else's interface, it is also external.
11743 This only affects inlines and template instantiations. */
11744 else if (!finfo->interface_unknown && honor_interface)
11746 if (DECL_DECLARED_INLINE_P (decl1)
11747 || DECL_TEMPLATE_INSTANTIATION (decl1)
11748 || processing_template_decl)
11750 DECL_EXTERNAL (decl1)
11751 = (finfo->interface_only
11752 || (DECL_DECLARED_INLINE_P (decl1)
11753 && ! flag_implement_inlines
11754 && !DECL_VINDEX (decl1)));
11756 /* For WIN32 we also want to put these in linkonce sections. */
11757 maybe_make_one_only (decl1);
11760 DECL_EXTERNAL (decl1) = 0;
11761 DECL_INTERFACE_KNOWN (decl1) = 1;
11762 /* If this function is in an interface implemented in this file,
11763 make sure that the back end knows to emit this function
11765 if (!DECL_EXTERNAL (decl1))
11766 mark_needed (decl1);
11768 else if (finfo->interface_unknown && finfo->interface_only
11769 && honor_interface)
11771 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11772 interface, we will have both finfo->interface_unknown and
11773 finfo->interface_only set. In that case, we don't want to
11774 use the normal heuristics because someone will supply a
11775 #pragma implementation elsewhere, and deducing it here would
11776 produce a conflict. */
11777 comdat_linkage (decl1);
11778 DECL_EXTERNAL (decl1) = 0;
11779 DECL_INTERFACE_KNOWN (decl1) = 1;
11780 DECL_DEFER_OUTPUT (decl1) = 1;
11784 /* This is a definition, not a reference.
11785 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11786 if (!GNU_INLINE_P (decl1))
11787 DECL_EXTERNAL (decl1) = 0;
11789 if ((DECL_DECLARED_INLINE_P (decl1)
11790 || DECL_TEMPLATE_INSTANTIATION (decl1))
11791 && ! DECL_INTERFACE_KNOWN (decl1)
11792 /* Don't try to defer nested functions for now. */
11793 && ! decl_function_context (decl1))
11794 DECL_DEFER_OUTPUT (decl1) = 1;
11796 DECL_INTERFACE_KNOWN (decl1) = 1;
11799 /* Determine the ELF visibility attribute for the function. We must not
11800 do this before calling "pushdecl", as we must allow "duplicate_decls"
11801 to merge any attributes appropriately. We also need to wait until
11803 if (!DECL_CLONED_FUNCTION_P (decl1))
11804 determine_visibility (decl1);
11806 begin_scope (sk_function_parms, decl1);
11810 if (DECL_DESTRUCTOR_P (decl1)
11811 || (DECL_CONSTRUCTOR_P (decl1)
11812 && targetm.cxx.cdtor_returns_this ()))
11814 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11815 DECL_CONTEXT (cdtor_label) = current_function_decl;
11818 start_fname_decls ();
11820 store_parm_decls (current_function_parms);
11824 /* Like start_preparsed_function, except that instead of a
11825 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11827 Returns 1 on success. If the DECLARATOR is not suitable for a function
11828 (it defines a datum instead), we return 0, which tells
11829 yyparse to report a parse error. */
11832 start_function (cp_decl_specifier_seq *declspecs,
11833 const cp_declarator *declarator,
11838 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11839 if (decl1 == error_mark_node)
11841 /* If the declarator is not suitable for a function definition,
11842 cause a syntax error. */
11843 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11845 error ("invalid function declaration");
11849 if (DECL_MAIN_P (decl1))
11850 /* main must return int. grokfndecl should have corrected it
11851 (and issued a diagnostic) if the user got it wrong. */
11852 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11853 integer_type_node));
11855 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11860 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11864 use_eh_spec_block (tree fn)
11866 return (flag_exceptions && flag_enforce_eh_specs
11867 && !processing_template_decl
11868 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11869 /* We insert the EH_SPEC_BLOCK only in the original
11870 function; then, it is copied automatically to the
11872 && !DECL_CLONED_FUNCTION_P (fn)
11873 /* Implicitly-generated constructors and destructors have
11874 exception specifications. However, those specifications
11875 are the union of the possible exceptions specified by the
11876 constructors/destructors for bases and members, so no
11877 unallowed exception will ever reach this function. By
11878 not creating the EH_SPEC_BLOCK we save a little memory,
11879 and we avoid spurious warnings about unreachable
11881 && !DECL_ARTIFICIAL (fn));
11884 /* Store the parameter declarations into the current function declaration.
11885 This is called after parsing the parameter declarations, before
11886 digesting the body of the function.
11888 Also install to binding contour return value identifier, if any. */
11891 store_parm_decls (tree current_function_parms)
11893 tree fndecl = current_function_decl;
11896 /* This is a chain of any other decls that came in among the parm
11897 declarations. If a parm is declared with enum {foo, bar} x;
11898 then CONST_DECLs for foo and bar are put here. */
11899 tree nonparms = NULL_TREE;
11901 if (current_function_parms)
11903 /* This case is when the function was defined with an ANSI prototype.
11904 The parms already have decls, so we need not do anything here
11905 except record them as in effect
11906 and complain if any redundant old-style parm decls were written. */
11908 tree specparms = current_function_parms;
11911 /* Must clear this because it might contain TYPE_DECLs declared
11913 current_binding_level->names = NULL;
11915 /* If we're doing semantic analysis, then we'll call pushdecl
11916 for each of these. We must do them in reverse order so that
11917 they end in the correct forward order. */
11918 specparms = nreverse (specparms);
11920 for (parm = specparms; parm; parm = next)
11922 next = TREE_CHAIN (parm);
11923 if (TREE_CODE (parm) == PARM_DECL)
11925 if (DECL_NAME (parm) == NULL_TREE
11926 || TREE_CODE (parm) != VOID_TYPE)
11929 error ("parameter %qD declared void", parm);
11933 /* If we find an enum constant or a type tag,
11934 put it aside for the moment. */
11935 TREE_CHAIN (parm) = NULL_TREE;
11936 nonparms = chainon (nonparms, parm);
11940 /* Get the decls in their original chain order and record in the
11941 function. This is all and only the PARM_DECLs that were
11942 pushed into scope by the loop above. */
11943 DECL_ARGUMENTS (fndecl) = getdecls ();
11946 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11948 /* Now store the final chain of decls for the arguments
11949 as the decl-chain of the current lexical scope.
11950 Put the enumerators in as well, at the front so that
11951 DECL_ARGUMENTS is not modified. */
11952 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11954 if (use_eh_spec_block (current_function_decl))
11955 current_eh_spec_block = begin_eh_spec_block ();
11959 /* We have finished doing semantic analysis on DECL, but have not yet
11960 generated RTL for its body. Save away our current state, so that
11961 when we want to generate RTL later we know what to do. */
11964 save_function_data (tree decl)
11966 struct language_function *f;
11968 /* Save the language-specific per-function data so that we can
11969 get it back when we really expand this function. */
11970 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11973 f = GGC_NEW (struct language_function);
11974 memcpy (f, cp_function_chain, sizeof (struct language_function));
11975 DECL_SAVED_FUNCTION_DATA (decl) = f;
11977 /* Clear out the bits we don't need. */
11978 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11979 f->bindings = NULL;
11980 f->x_local_names = NULL;
11984 /* Set the return value of the constructor (if present). */
11987 finish_constructor_body (void)
11992 if (targetm.cxx.cdtor_returns_this ()
11993 && (! TYPE_FOR_JAVA (current_class_type)))
11995 /* Any return from a constructor will end up here. */
11996 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11998 val = DECL_ARGUMENTS (current_function_decl);
11999 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12000 DECL_RESULT (current_function_decl), val);
12001 /* Return the address of the object. */
12002 exprstmt = build_stmt (RETURN_EXPR, val);
12003 add_stmt (exprstmt);
12007 /* Do all the processing for the beginning of a destructor; set up the
12008 vtable pointers and cleanups for bases and members. */
12011 begin_destructor_body (void)
12013 tree compound_stmt;
12015 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12016 issued an error message. We still want to try to process the
12017 body of the function, but initialize_vtbl_ptrs will crash if
12018 TYPE_BINFO is NULL. */
12019 if (COMPLETE_TYPE_P (current_class_type))
12021 compound_stmt = begin_compound_stmt (0);
12022 /* Make all virtual function table pointers in non-virtual base
12023 classes point to CURRENT_CLASS_TYPE's virtual function
12025 initialize_vtbl_ptrs (current_class_ptr);
12026 finish_compound_stmt (compound_stmt);
12028 /* And insert cleanups for our bases and members so that they
12029 will be properly destroyed if we throw. */
12030 push_base_cleanups ();
12034 /* At the end of every destructor we generate code to delete the object if
12035 necessary. Do that now. */
12038 finish_destructor_body (void)
12042 /* Any return from a destructor will end up here; that way all base
12043 and member cleanups will be run when the function returns. */
12044 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
12046 /* In a virtual destructor, we must call delete. */
12047 if (DECL_VIRTUAL_P (current_function_decl))
12050 tree virtual_size = cxx_sizeof (current_class_type);
12054 At the point of definition of a virtual destructor (including
12055 an implicit definition), non-placement operator delete shall
12056 be looked up in the scope of the destructor's class and if
12057 found shall be accessible and unambiguous. */
12058 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12060 /*global_p=*/false,
12061 /*placement=*/NULL_TREE,
12062 /*alloc_fn=*/NULL_TREE);
12064 if_stmt = begin_if_stmt ();
12065 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12066 current_in_charge_parm,
12069 finish_expr_stmt (exprstmt);
12070 finish_then_clause (if_stmt);
12071 finish_if_stmt (if_stmt);
12074 if (targetm.cxx.cdtor_returns_this ())
12078 val = DECL_ARGUMENTS (current_function_decl);
12079 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12080 DECL_RESULT (current_function_decl), val);
12081 /* Return the address of the object. */
12082 exprstmt = build_stmt (RETURN_EXPR, val);
12083 add_stmt (exprstmt);
12087 /* Do the necessary processing for the beginning of a function body, which
12088 in this case includes member-initializers, but not the catch clauses of
12089 a function-try-block. Currently, this means opening a binding level
12090 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12093 begin_function_body (void)
12097 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12100 if (processing_template_decl)
12101 /* Do nothing now. */;
12103 /* Always keep the BLOCK node associated with the outermost pair of
12104 curly braces of a function. These are needed for correct
12105 operation of dwarfout.c. */
12106 keep_next_level (true);
12108 stmt = begin_compound_stmt (BCS_FN_BODY);
12110 if (processing_template_decl)
12111 /* Do nothing now. */;
12112 else if (DECL_DESTRUCTOR_P (current_function_decl))
12113 begin_destructor_body ();
12118 /* Do the processing for the end of a function body. Currently, this means
12119 closing out the cleanups for fully-constructed bases and members, and in
12120 the case of the destructor, deleting the object if desired. Again, this
12121 is only meaningful for [cd]tors, since they are the only functions where
12122 there is a significant distinction between the main body and any
12123 function catch clauses. Handling, say, main() return semantics here
12124 would be wrong, as flowing off the end of a function catch clause for
12125 main() would also need to return 0. */
12128 finish_function_body (tree compstmt)
12130 if (compstmt == NULL_TREE)
12133 /* Close the block. */
12134 finish_compound_stmt (compstmt);
12136 if (processing_template_decl)
12137 /* Do nothing now. */;
12138 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12139 finish_constructor_body ();
12140 else if (DECL_DESTRUCTOR_P (current_function_decl))
12141 finish_destructor_body ();
12144 /* Given a function, returns the BLOCK corresponding to the outermost level
12145 of curly braces, skipping the artificial block created for constructor
12149 outer_curly_brace_block (tree fndecl)
12151 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12152 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12153 /* Skip the artificial function body block. */
12154 block = BLOCK_SUBBLOCKS (block);
12158 /* Finish up a function declaration and compile that function
12159 all the way to assembler language output. The free the storage
12160 for the function definition.
12162 FLAGS is a bitwise or of the following values:
12164 We just finished processing the body of an in-class inline
12165 function definition. (This processing will have taken place
12166 after the class definition is complete.) */
12169 finish_function (int flags)
12171 tree fndecl = current_function_decl;
12172 tree fntype, ctype = NULL_TREE;
12173 int inclass_inline = (flags & 2) != 0;
12176 /* When we get some parse errors, we can end up without a
12177 current_function_decl, so cope. */
12178 if (fndecl == NULL_TREE)
12179 return error_mark_node;
12181 gcc_assert (!defer_mark_used_calls);
12182 defer_mark_used_calls = true;
12184 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12185 && DECL_VIRTUAL_P (fndecl)
12186 && !processing_template_decl)
12188 tree fnclass = DECL_CONTEXT (fndecl);
12189 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12190 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12193 nested = function_depth > 1;
12194 fntype = TREE_TYPE (fndecl);
12196 /* TREE_READONLY (fndecl) = 1;
12197 This caused &foo to be of type ptr-to-const-function
12198 which then got a warning when stored in a ptr-to-function variable. */
12200 gcc_assert (building_stmt_tree ());
12201 /* The current function is being defined, so its DECL_INITIAL should
12202 be set, and unless there's a multiple definition, it should be
12203 error_mark_node. */
12204 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12206 /* For a cloned function, we've already got all the code we need;
12207 there's no need to add any extra bits. */
12208 if (!DECL_CLONED_FUNCTION_P (fndecl))
12210 if (DECL_MAIN_P (current_function_decl))
12214 /* Make it so that `main' always returns 0 by default (or
12217 stmt = finish_return_stmt (integer_one_node);
12219 stmt = finish_return_stmt (integer_zero_node);
12221 /* Hack. We don't want the middle-end to warn that this
12222 return is unreachable, so put the statement on the
12225 location_t linezero = linemap_line_start (line_table, 0, 1);
12226 SET_EXPR_LOCATION (stmt, linezero);
12230 if (use_eh_spec_block (current_function_decl))
12231 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12232 (TREE_TYPE (current_function_decl)),
12233 current_eh_spec_block);
12236 /* If we're saving up tree structure, tie off the function now. */
12237 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12239 finish_fname_decls ();
12241 /* If this function can't throw any exceptions, remember that. */
12242 if (!processing_template_decl
12243 && !cp_function_chain->can_throw
12244 && !flag_non_call_exceptions
12245 && !DECL_REPLACEABLE_P (fndecl))
12246 TREE_NOTHROW (fndecl) = 1;
12248 /* This must come after expand_function_end because cleanups might
12249 have declarations (from inline functions) that need to go into
12250 this function's blocks. */
12252 /* If the current binding level isn't the outermost binding level
12253 for this function, either there is a bug, or we have experienced
12254 syntax errors and the statement tree is malformed. */
12255 if (current_binding_level->kind != sk_function_parms)
12257 /* Make sure we have already experienced errors. */
12258 gcc_assert (errorcount);
12260 /* Throw away the broken statement tree and extra binding
12262 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12264 while (current_binding_level->kind != sk_function_parms)
12266 if (current_binding_level->kind == sk_class)
12267 pop_nested_class ();
12269 poplevel (0, 0, 0);
12272 poplevel (1, 0, 1);
12274 /* Statements should always be full-expressions at the outermost set
12275 of curly braces for a function. */
12276 gcc_assert (stmts_are_full_exprs_p ());
12278 /* Set up the named return value optimization, if we can. Candidate
12279 variables are selected in check_return_expr. */
12280 if (current_function_return_value)
12282 tree r = current_function_return_value;
12285 if (r != error_mark_node
12286 /* This is only worth doing for fns that return in memory--and
12287 simpler, since we don't have to worry about promoted modes. */
12288 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12289 /* Only allow this for variables declared in the outer scope of
12290 the function so we know that their lifetime always ends with a
12291 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12292 we were to do this optimization in tree-ssa. */
12293 && (outer = outer_curly_brace_block (fndecl))
12294 && chain_member (r, BLOCK_VARS (outer)))
12295 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12297 current_function_return_value = NULL_TREE;
12300 /* Remember that we were in class scope. */
12301 if (current_class_name)
12302 ctype = current_class_type;
12304 /* Must mark the RESULT_DECL as being in this function. */
12305 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12307 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12308 to the FUNCTION_DECL node itself. */
12309 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12311 /* Save away current state, if appropriate. */
12312 if (!processing_template_decl)
12313 save_function_data (fndecl);
12315 /* Complain if there's just no return statement. */
12316 if (warn_return_type
12317 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12318 && !dependent_type_p (TREE_TYPE (fntype))
12319 && !current_function_returns_value && !current_function_returns_null
12320 /* Don't complain if we abort or throw. */
12321 && !current_function_returns_abnormally
12322 && !DECL_NAME (DECL_RESULT (fndecl))
12323 && !TREE_NO_WARNING (fndecl)
12324 /* Structor return values (if any) are set by the compiler. */
12325 && !DECL_CONSTRUCTOR_P (fndecl)
12326 && !DECL_DESTRUCTOR_P (fndecl))
12328 warning (OPT_Wreturn_type,
12329 "no return statement in function returning non-void");
12330 TREE_NO_WARNING (fndecl) = 1;
12333 /* Store the end of the function, so that we get good line number
12334 info for the epilogue. */
12335 cfun->function_end_locus = input_location;
12337 /* Genericize before inlining. */
12338 if (!processing_template_decl)
12340 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12341 cp_genericize (fndecl);
12342 /* Clear out the bits we don't need. */
12343 f->x_current_class_ptr = NULL;
12344 f->x_current_class_ref = NULL;
12345 f->x_eh_spec_block = NULL;
12346 f->x_in_charge_parm = NULL;
12347 f->x_vtt_parm = NULL;
12348 f->x_return_value = NULL;
12349 f->bindings = NULL;
12350 f->extern_decl_map = NULL;
12352 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12353 c_warn_unused_result (gimple_body (fndecl));
12355 /* Clear out the bits we don't need. */
12356 local_names = NULL;
12358 /* We're leaving the context of this function, so zap cfun. It's still in
12359 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12361 current_function_decl = NULL;
12363 /* If this is an in-class inline definition, we may have to pop the
12364 bindings for the template parameters that we added in
12365 maybe_begin_member_template_processing when start_function was
12367 if (inclass_inline)
12368 maybe_end_member_template_processing ();
12370 /* Leave the scope of the class. */
12372 pop_nested_class ();
12378 /* Let the error reporting routines know that we're outside a
12379 function. For a nested function, this value is used in
12380 cxx_pop_function_context and then reset via pop_function_context. */
12381 current_function_decl = NULL_TREE;
12383 defer_mark_used_calls = false;
12384 if (deferred_mark_used_calls)
12389 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12391 VEC_free (tree, gc, deferred_mark_used_calls);
12397 /* Create the FUNCTION_DECL for a function definition.
12398 DECLSPECS and DECLARATOR are the parts of the declaration;
12399 they describe the return type and the name of the function,
12400 but twisted together in a fashion that parallels the syntax of C.
12402 This function creates a binding context for the function body
12403 as well as setting up the FUNCTION_DECL in current_function_decl.
12405 Returns a FUNCTION_DECL on success.
12407 If the DECLARATOR is not suitable for a function (it defines a datum
12408 instead), we return 0, which tells yyparse to report a parse error.
12410 May return void_type_node indicating that this method is actually
12411 a friend. See grokfield for more details.
12413 Came here with a `.pushlevel' .
12415 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12416 CHANGES TO CODE IN `grokfield'. */
12419 start_method (cp_decl_specifier_seq *declspecs,
12420 const cp_declarator *declarator, tree attrlist)
12422 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12425 if (fndecl == error_mark_node)
12426 return error_mark_node;
12428 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12430 error ("invalid member function declaration");
12431 return error_mark_node;
12435 cplus_decl_attributes (&fndecl, attrlist, 0);
12437 /* Pass friends other than inline friend functions back. */
12438 if (fndecl == void_type_node)
12441 if (DECL_IN_AGGR_P (fndecl))
12443 if (DECL_CONTEXT (fndecl)
12444 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12445 error ("%qD is already defined in class %qT", fndecl,
12446 DECL_CONTEXT (fndecl));
12447 return error_mark_node;
12450 check_template_shadow (fndecl);
12452 DECL_DECLARED_INLINE_P (fndecl) = 1;
12453 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12455 /* We process method specializations in finish_struct_1. */
12456 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12458 fndecl = push_template_decl (fndecl);
12459 if (fndecl == error_mark_node)
12463 if (! DECL_FRIEND_P (fndecl))
12465 if (TREE_CHAIN (fndecl))
12467 fndecl = copy_node (fndecl);
12468 TREE_CHAIN (fndecl) = NULL_TREE;
12472 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12474 /* Make a place for the parms. */
12475 begin_scope (sk_function_parms, fndecl);
12477 DECL_IN_AGGR_P (fndecl) = 1;
12481 /* Go through the motions of finishing a function definition.
12482 We don't compile this method until after the whole class has
12485 FINISH_METHOD must return something that looks as though it
12486 came from GROKFIELD (since we are defining a method, after all).
12488 This is called after parsing the body of the function definition.
12489 STMTS is the chain of statements that makes up the function body.
12491 DECL is the ..._DECL that `start_method' provided. */
12494 finish_method (tree decl)
12496 tree fndecl = decl;
12501 if (decl == void_type_node)
12504 old_initial = DECL_INITIAL (fndecl);
12506 /* Undo the level for the parms (from start_method).
12507 This is like poplevel, but it causes nothing to be
12508 saved. Saving information here confuses symbol-table
12509 output routines. Besides, this information will
12510 be correctly output when this method is actually
12513 /* Clear out the meanings of the local variables of this level;
12514 also record in each decl which block it belongs to. */
12516 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12518 if (DECL_NAME (link) != NULL_TREE)
12519 pop_binding (DECL_NAME (link), link);
12520 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12521 DECL_CONTEXT (link) = NULL_TREE;
12524 poplevel (0, 0, 0);
12526 DECL_INITIAL (fndecl) = old_initial;
12528 /* We used to check if the context of FNDECL was different from
12529 current_class_type as another way to get inside here. This didn't work
12530 for String.cc in libg++. */
12531 if (DECL_FRIEND_P (fndecl))
12533 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12535 decl = void_type_node;
12542 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12543 we can lay it out later, when and if its type becomes complete. */
12546 maybe_register_incomplete_var (tree var)
12548 gcc_assert (TREE_CODE (var) == VAR_DECL);
12550 /* Keep track of variables with incomplete types. */
12551 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12552 && DECL_EXTERNAL (var))
12554 tree inner_type = TREE_TYPE (var);
12556 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12557 inner_type = TREE_TYPE (inner_type);
12558 inner_type = TYPE_MAIN_VARIANT (inner_type);
12560 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12561 /* RTTI TD entries are created while defining the type_info. */
12562 || (TYPE_LANG_SPECIFIC (inner_type)
12563 && TYPE_BEING_DEFINED (inner_type)))
12564 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12568 /* Called when a class type (given by TYPE) is defined. If there are
12569 any existing VAR_DECLs whose type has been completed by this
12570 declaration, update them now. */
12573 complete_vars (tree type)
12575 tree *list = &incomplete_vars;
12577 gcc_assert (CLASS_TYPE_P (type));
12580 if (same_type_p (type, TREE_PURPOSE (*list)))
12582 tree var = TREE_VALUE (*list);
12583 tree type = TREE_TYPE (var);
12584 /* Complete the type of the variable. The VAR_DECL itself
12585 will be laid out in expand_expr. */
12586 complete_type (type);
12587 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12588 /* Remove this entry from the list. */
12589 *list = TREE_CHAIN (*list);
12592 list = &TREE_CHAIN (*list);
12595 /* Check for pending declarations which may have abstract type. */
12596 complete_type_check_abstract (type);
12599 /* If DECL is of a type which needs a cleanup, build and return an
12600 expression to perform that cleanup here. Return NULL_TREE if no
12601 cleanup need be done. */
12604 cxx_maybe_build_cleanup (tree decl)
12610 /* Assume no cleanup is required. */
12611 cleanup = NULL_TREE;
12613 if (error_operand_p (decl))
12616 /* Handle "__attribute__((cleanup))". We run the cleanup function
12617 before the destructor since the destructor is what actually
12618 terminates the lifetime of the object. */
12619 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12626 /* Get the name specified by the user for the cleanup function. */
12627 id = TREE_VALUE (TREE_VALUE (attr));
12628 /* Look up the name to find the cleanup function to call. It is
12629 important to use lookup_name here because that is what is
12630 used in c-common.c:handle_cleanup_attribute when performing
12631 initial checks on the attribute. Note that those checks
12632 include ensuring that the function found is not an overloaded
12633 function, or an object with an overloaded call operator,
12634 etc.; we can rely on the fact that the function found is an
12635 ordinary FUNCTION_DECL. */
12636 fn = lookup_name (id);
12637 arg = build_address (decl);
12639 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12641 tf_warning_or_error);
12643 /* Handle ordinary C++ destructors. */
12644 type = TREE_TYPE (decl);
12645 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12647 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12648 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12649 && CLASSTYPE_VBASECLASSES (type));
12653 if (TREE_CODE (type) == ARRAY_TYPE)
12656 addr = build_address (decl);
12658 /* Optimize for space over speed here. */
12659 if (!has_vbases || flag_expensive_optimizations)
12660 flags |= LOOKUP_NONVIRTUAL;
12662 call = build_delete (TREE_TYPE (addr), addr,
12663 sfk_complete_destructor, flags, 0);
12665 cleanup = build_compound_expr (cleanup, call);
12673 /* When a stmt has been parsed, this function is called. */
12680 /* DECL was originally constructed as a non-static member function,
12681 but turned out to be static. Update it accordingly. */
12684 revert_static_member_fn (tree decl)
12687 tree function = TREE_TYPE (decl);
12688 tree args = TYPE_ARG_TYPES (function);
12690 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12691 != TYPE_UNQUALIFIED)
12692 error ("static member function %q#D declared with type qualifiers", decl);
12694 args = TREE_CHAIN (args);
12695 tmp = build_function_type (TREE_TYPE (function), args);
12696 tmp = build_qualified_type (tmp, cp_type_quals (function));
12697 tmp = build_exception_variant (tmp,
12698 TYPE_RAISES_EXCEPTIONS (function));
12699 TREE_TYPE (decl) = tmp;
12700 if (DECL_ARGUMENTS (decl))
12701 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12702 DECL_STATIC_FUNCTION_P (decl) = 1;
12705 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12706 one of the language-independent trees. */
12708 enum cp_tree_node_structure_enum
12709 cp_tree_node_structure (union lang_tree_node * t)
12711 switch (TREE_CODE (&t->generic))
12713 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12714 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12715 case OVERLOAD: return TS_CP_OVERLOAD;
12716 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12717 case PTRMEM_CST: return TS_CP_PTRMEM;
12718 case BASELINK: return TS_CP_BASELINK;
12719 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12720 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12721 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12722 default: return TS_CP_GENERIC;
12726 /* Build the void_list_node (void_type_node having been created). */
12728 build_void_list_node (void)
12730 tree t = build_tree_list (NULL_TREE, void_type_node);
12735 cp_missing_noreturn_ok_p (tree decl)
12737 /* A missing noreturn is ok for the `main' function. */
12738 return DECL_MAIN_P (decl);
12741 /* Return the COMDAT group into which DECL should be placed. */
12744 cxx_comdat_group (tree decl)
12748 /* Virtual tables, construction virtual tables, and virtual table
12749 tables all go in a single COMDAT group, named after the primary
12751 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12752 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12753 /* For all other DECLs, the COMDAT group is the mangled name of the
12754 declaration itself. */
12757 while (DECL_THUNK_P (decl))
12759 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12760 into the same section as the target function. In that case
12761 we must return target's name. */
12762 tree target = THUNK_TARGET (decl);
12763 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12764 && DECL_SECTION_NAME (target) != NULL
12765 && DECL_ONE_ONLY (target))
12770 name = DECL_ASSEMBLER_NAME (decl);
12773 return IDENTIFIER_POINTER (name);
12776 #include "gt-cp-decl.h"