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, 2010
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"
38 #include "tree-iterator.h"
39 #include "tree-inline.h"
48 #include "c-family/c-common.h"
49 #include "c-family/c-pragma.h"
50 #include "diagnostic.h"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
56 #include "splay-tree.h"
59 static tree grokparms (tree parmlist, tree *);
60 static const char *redeclaration_error_message (tree, tree);
62 static int decl_jump_unsafe (tree);
63 static void require_complete_types_for_parms (tree);
64 static int ambi_op_p (enum tree_code);
65 static int unary_op_p (enum tree_code);
66 static void push_local_name (tree);
67 static tree grok_reference_init (tree, tree, tree, tree *);
68 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
70 static void record_unknown_type (tree, const char *);
71 static tree builtin_function_1 (tree, tree, bool);
72 static tree build_library_fn_1 (tree, enum tree_code, tree);
73 static int member_function_or_else (tree, tree, enum overload_flags);
74 static void bad_specifiers (tree, const char *, int, int, int, int,
76 static void check_for_uninitialized_const_var (tree);
77 static hashval_t typename_hash (const void *);
78 static int typename_compare (const void *, const void *);
79 static tree local_variable_p_walkfn (tree *, int *, void *);
80 static tree record_builtin_java_type (const char *, int);
81 static const char *tag_name (enum tag_types);
82 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
83 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
84 static void maybe_deduce_size_from_array_init (tree, tree);
85 static void layout_var_decl (tree);
86 static tree check_initializer (tree, tree, int, tree *);
87 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
88 static void save_function_data (tree);
89 static void check_function_type (tree, tree);
90 static void finish_constructor_body (void);
91 static void begin_destructor_body (void);
92 static void finish_destructor_body (void);
93 static void record_key_method_defined (tree);
94 static tree create_array_type_for_decl (tree, tree, tree);
95 static tree get_atexit_node (void);
96 static tree get_dso_handle_node (void);
97 static tree start_cleanup_fn (void);
98 static void end_cleanup_fn (void);
99 static tree cp_make_fname_decl (location_t, tree, int);
100 static void initialize_predefined_identifiers (void);
101 static tree check_special_function_return_type
102 (special_function_kind, tree, tree);
103 static tree push_cp_library_fn (enum tree_code, tree);
104 static tree build_cp_library_fn (tree, enum tree_code, tree);
105 static void store_parm_decls (tree);
106 static void initialize_local_var (tree, tree);
107 static void expand_static_init (tree, tree);
109 /* The following symbols are subsumed in the cp_global_trees array, and
110 listed here individually for documentation purposes.
113 tree wchar_decl_node;
115 tree vtable_entry_type;
116 tree delta_type_node;
117 tree __t_desc_type_node;
119 tree class_type_node;
120 tree unknown_type_node;
122 Array type `vtable_entry_type[]'
125 tree vtbl_ptr_type_node;
132 A FUNCTION_DECL which can call `abort'. Not necessarily the
133 one that the user will declare, but sufficient to be called
134 by routines that want to abort the program.
138 The FUNCTION_DECL for the default `::operator delete'.
140 tree global_delete_fndecl;
143 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
144 tree tinfo_var_id; */
146 tree cp_global_trees[CPTI_MAX];
148 /* Indicates that there is a type value in some namespace, although
149 that is not necessarily in scope at the moment. */
151 tree global_type_node;
153 /* The node that holds the "name" of the global scope. */
154 tree global_scope_name;
156 #define local_names cp_function_chain->x_local_names
158 /* A list of objects which have constructors or destructors
159 which reside in the global scope. The decl is stored in
160 the TREE_VALUE slot and the initializer is stored
161 in the TREE_PURPOSE slot. */
162 tree static_aggregates;
166 /* A node for the integer constants 2, and 3. */
168 tree integer_two_node, integer_three_node;
170 /* Used only for jumps to as-yet undefined labels, since jumps to
171 defined labels can have their validity checked immediately. */
173 struct GTY(()) named_label_use_entry {
174 struct named_label_use_entry *next;
175 /* The binding level to which this entry is *currently* attached.
176 This is initially the binding level in which the goto appeared,
177 but is modified as scopes are closed. */
178 struct cp_binding_level *binding_level;
179 /* The head of the names list that was current when the goto appeared,
180 or the inner scope popped. These are the decls that will *not* be
181 skipped when jumping to the label. */
183 /* The location of the goto, for error reporting. */
184 location_t o_goto_locus;
185 /* True if an OpenMP structured block scope has been closed since
186 the goto appeared. This means that the branch from the label will
187 illegally exit an OpenMP scope. */
191 /* A list of all LABEL_DECLs in the function that have names. Here so
192 we can clear out their names' definitions at the end of the
193 function, and so we can check the validity of jumps to these labels. */
195 struct GTY(()) named_label_entry {
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 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
503 when errors were reported, except for -Werror-unused-but-set-*. */
504 static int unused_but_set_errorcount;
506 /* Exit a binding level.
507 Pop the level off, and restore the state of the identifier-decl mappings
508 that were in effect when this level was entered.
510 If KEEP == 1, this level had explicit declarations, so
511 and create a "block" (a BLOCK node) for the level
512 to record its declarations and subblocks for symbol table output.
514 If FUNCTIONBODY is nonzero, this level is the body of a function,
515 so create a block as if KEEP were set and also clear out all
518 If REVERSE is nonzero, reverse the order of decls before putting
519 them into the BLOCK. */
522 poplevel (int keep, int reverse, int functionbody)
525 /* The chain of decls was accumulated in reverse order.
526 Put it into forward order, just for cleanliness. */
531 int leaving_for_scope;
534 timevar_push (TV_NAME_LOOKUP);
539 gcc_assert (current_binding_level->kind != sk_class);
541 if (current_binding_level->kind == sk_cleanup)
543 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
545 gcc_assert (!VEC_length(cp_class_binding,
546 current_binding_level->class_shadowed));
548 /* We used to use KEEP == 2 to indicate that the new block should go
549 at the beginning of the list of blocks at this binding level,
550 rather than the end. This hack is no longer used. */
551 gcc_assert (keep == 0 || keep == 1);
553 if (current_binding_level->keep)
556 /* Any uses of undefined labels, and any defined labels, now operate
557 under constraints of next binding contour. */
558 if (cfun && !functionbody && named_labels)
559 htab_traverse (named_labels, poplevel_named_label_1,
560 current_binding_level);
562 /* Get the decls in the order they were written.
563 Usually current_binding_level->names is in reverse order.
564 But parameter decls were previously put in forward order. */
567 current_binding_level->names
568 = decls = nreverse (current_binding_level->names);
570 decls = current_binding_level->names;
572 /* If there were any declarations or structure tags in that level,
573 or if this level is a function body,
574 create a BLOCK to record them for the life of this function. */
576 if (keep == 1 || functionbody)
577 block = make_node (BLOCK);
578 if (block != NULL_TREE)
580 BLOCK_VARS (block) = decls;
581 BLOCK_SUBBLOCKS (block) = subblocks;
584 /* In each subblock, record that this is its superior. */
586 for (link = subblocks; link; link = BLOCK_CHAIN (link))
587 BLOCK_SUPERCONTEXT (link) = block;
589 /* We still support the old for-scope rules, whereby the variables
590 in a for-init statement were in scope after the for-statement
591 ended. We only use the new rules if flag_new_for_scope is
594 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
596 /* Before we remove the declarations first check for unused variables. */
597 if ((warn_unused_variable || warn_unused_but_set_variable)
598 && !processing_template_decl)
599 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
600 if (TREE_CODE (decl) == VAR_DECL
601 && (! TREE_USED (decl) || !DECL_READ_P (decl))
602 && ! DECL_IN_SYSTEM_HEADER (decl)
603 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
605 if (! TREE_USED (decl))
606 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
607 else if (DECL_CONTEXT (decl) == current_function_decl
608 && TREE_TYPE (decl) != error_mark_node
609 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
610 && errorcount == unused_but_set_errorcount
611 && (!CLASS_TYPE_P (TREE_TYPE (decl))
612 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
614 warning (OPT_Wunused_but_set_variable,
615 "variable %q+D set but not used", decl);
616 unused_but_set_errorcount = errorcount;
620 /* Remove declarations for all the DECLs in this level. */
621 for (link = decls; link; link = TREE_CHAIN (link))
623 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
626 tree name = DECL_NAME (link);
630 ob = outer_binding (name,
631 IDENTIFIER_BINDING (name),
634 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
636 ns_binding = NULL_TREE;
638 if (ob && ob->scope == current_binding_level->level_chain)
639 /* We have something like:
644 and we are leaving the `for' scope. There's no reason to
645 keep the binding of the inner `i' in this case. */
646 pop_binding (name, link);
647 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
648 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
649 /* Here, we have something like:
657 We must pop the for-scope binding so we know what's a
658 type and what isn't. */
659 pop_binding (name, link);
662 /* Mark this VAR_DECL as dead so that we can tell we left it
663 there only for backward compatibility. */
664 DECL_DEAD_FOR_LOCAL (link) = 1;
666 /* Keep track of what should have happened when we
667 popped the binding. */
670 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
671 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
674 /* Add it to the list of dead variables in the next
675 outermost binding to that we can remove these when we
676 leave that binding. */
677 current_binding_level->level_chain->dead_vars_from_for
678 = tree_cons (NULL_TREE, link,
679 current_binding_level->level_chain->
682 /* Although we don't pop the cxx_binding, we do clear
683 its SCOPE since the scope is going away now. */
684 IDENTIFIER_BINDING (name)->scope
685 = current_binding_level->level_chain;
692 /* Remove the binding. */
695 if (TREE_CODE (decl) == TREE_LIST)
696 decl = TREE_VALUE (decl);
699 if (TREE_CODE (name) == OVERLOAD)
700 name = OVL_FUNCTION (name);
702 gcc_assert (DECL_P (name));
703 pop_binding (DECL_NAME (name), decl);
707 /* Remove declarations for any `for' variables from inner scopes
708 that we kept around. */
709 for (link = current_binding_level->dead_vars_from_for;
710 link; link = TREE_CHAIN (link))
711 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
713 /* Restore the IDENTIFIER_TYPE_VALUEs. */
714 for (link = current_binding_level->type_shadowed;
715 link; link = TREE_CHAIN (link))
716 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
718 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
719 for (link = current_binding_level->shadowed_labels;
721 link = TREE_CHAIN (link))
722 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
724 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
725 list if a `using' declaration put them there. The debugging
726 back ends won't understand OVERLOAD, so we remove them here.
727 Because the BLOCK_VARS are (temporarily) shared with
728 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
729 popped all the bindings. */
734 for (d = &BLOCK_VARS (block); *d; )
736 if (TREE_CODE (*d) == TREE_LIST)
737 *d = TREE_CHAIN (*d);
739 d = &TREE_CHAIN (*d);
743 /* If the level being exited is the top level of a function,
744 check over all the labels. */
747 /* Since this is the top level block of a function, the vars are
748 the function's parameters. Don't leave them in the BLOCK
749 because they are found in the FUNCTION_DECL instead. */
750 BLOCK_VARS (block) = 0;
754 kind = current_binding_level->kind;
755 if (kind == sk_cleanup)
759 /* If this is a temporary binding created for a cleanup, then we'll
760 have pushed a statement list level. Pop that, create a new
761 BIND_EXPR for the block, and insert it into the stream. */
762 stmt = pop_stmt_list (current_binding_level->statement_list);
763 stmt = c_build_bind_expr (input_location, block, stmt);
770 /* The current function is being defined, so its DECL_INITIAL
771 should be error_mark_node. */
772 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
773 DECL_INITIAL (current_function_decl) = block;
776 current_binding_level->blocks
777 = chainon (current_binding_level->blocks, block);
779 /* If we did not make a block for the level just exited,
780 any blocks made for inner levels
781 (since they cannot be recorded as subblocks in that level)
782 must be carried forward so they will later become subblocks
783 of something else. */
785 current_binding_level->blocks
786 = chainon (current_binding_level->blocks, subblocks);
788 /* Each and every BLOCK node created here in `poplevel' is important
789 (e.g. for proper debugging information) so if we created one
790 earlier, mark it as "used". */
792 TREE_USED (block) = 1;
794 /* All temporary bindings created for cleanups are popped silently. */
795 if (kind == sk_cleanup)
798 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
801 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
802 itself, calling F for each. The DATA is passed to F as well. */
805 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
808 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
810 result |= (*f) (name_space, data);
812 for (; current; current = TREE_CHAIN (current))
813 result |= walk_namespaces_r (current, f, data);
818 /* Walk all the namespaces, calling F for each. The DATA is passed to
822 walk_namespaces (walk_namespaces_fn f, void* data)
824 return walk_namespaces_r (global_namespace, f, data);
827 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
828 DATA is non-NULL, this is the last time we will call
829 wrapup_global_declarations for this NAMESPACE. */
832 wrapup_globals_for_namespace (tree name_space, void* data)
834 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
835 VEC(tree,gc) *statics = level->static_decls;
836 tree *vec = VEC_address (tree, statics);
837 int len = VEC_length (tree, statics);
838 int last_time = (data != 0);
842 check_global_declarations (vec, len);
843 emit_debug_global_declarations (vec, len);
847 /* Write out any globals that need to be output. */
848 return wrapup_global_declarations (vec, len);
852 /* In C++, you don't have to write `struct S' to refer to `S'; you
853 can just use `S'. We accomplish this by creating a TYPE_DECL as
854 if the user had written `typedef struct S S'. Create and return
855 the TYPE_DECL for TYPE. */
858 create_implicit_typedef (tree name, tree type)
862 decl = build_decl (input_location, TYPE_DECL, name, type);
863 DECL_ARTIFICIAL (decl) = 1;
864 /* There are other implicit type declarations, like the one *within*
865 a class that allows you to write `S::S'. We must distinguish
867 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
868 TYPE_NAME (type) = decl;
869 TYPE_STUB_DECL (type) = decl;
874 /* Remember a local name for name-mangling purposes. */
877 push_local_name (tree decl)
882 timevar_push (TV_NAME_LOOKUP);
884 name = DECL_NAME (decl);
886 nelts = VEC_length (tree, local_names);
887 for (i = 0; i < nelts; i++)
889 t = VEC_index (tree, local_names, i);
890 if (DECL_NAME (t) == name)
892 if (!DECL_LANG_SPECIFIC (decl))
893 retrofit_lang_decl (decl);
894 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
895 if (DECL_LANG_SPECIFIC (t))
896 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
898 DECL_DISCRIMINATOR (decl) = 1;
900 VEC_replace (tree, local_names, i, decl);
901 timevar_pop (TV_NAME_LOOKUP);
906 VEC_safe_push (tree, gc, local_names, decl);
907 timevar_pop (TV_NAME_LOOKUP);
910 /* Subroutine of duplicate_decls: return truthvalue of whether
911 or not types of these decls match.
913 For C++, we must compare the parameter list so that `int' can match
914 `int&' in a parameter position, but `int&' is not confused with
918 decls_match (tree newdecl, tree olddecl)
922 if (newdecl == olddecl)
925 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
926 /* If the two DECLs are not even the same kind of thing, we're not
927 interested in their types. */
930 if (TREE_CODE (newdecl) == FUNCTION_DECL)
932 tree f1 = TREE_TYPE (newdecl);
933 tree f2 = TREE_TYPE (olddecl);
934 tree p1 = TYPE_ARG_TYPES (f1);
935 tree p2 = TYPE_ARG_TYPES (f2);
937 /* Specializations of different templates are different functions
938 even if they have the same type. */
939 tree t1 = (DECL_USE_TEMPLATE (newdecl)
940 ? DECL_TI_TEMPLATE (newdecl)
942 tree t2 = (DECL_USE_TEMPLATE (olddecl)
943 ? DECL_TI_TEMPLATE (olddecl)
948 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
949 && ! (DECL_EXTERN_C_P (newdecl)
950 && DECL_EXTERN_C_P (olddecl)))
953 #ifdef NO_IMPLICIT_EXTERN_C
954 /* A new declaration doesn't match a built-in one unless it
955 is also extern "C". */
956 if (DECL_IS_BUILTIN (olddecl)
957 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
961 if (TREE_CODE (f1) != TREE_CODE (f2))
964 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
966 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
967 && (DECL_BUILT_IN (olddecl)
968 #ifndef NO_IMPLICIT_EXTERN_C
969 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
970 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
974 types_match = self_promoting_args_p (p1);
975 if (p1 == void_list_node)
976 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
978 #ifndef NO_IMPLICIT_EXTERN_C
979 else if (p1 == NULL_TREE
980 && (DECL_EXTERN_C_P (olddecl)
981 && DECL_IN_SYSTEM_HEADER (olddecl)
982 && !DECL_CLASS_SCOPE_P (olddecl))
983 && (DECL_EXTERN_C_P (newdecl)
984 && DECL_IN_SYSTEM_HEADER (newdecl)
985 && !DECL_CLASS_SCOPE_P (newdecl)))
987 types_match = self_promoting_args_p (p2);
988 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
992 types_match = compparms (p1, p2);
997 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
999 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1000 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1003 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1004 DECL_TEMPLATE_PARMS (olddecl)))
1007 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1008 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1009 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1011 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1012 DECL_TEMPLATE_RESULT (newdecl));
1016 /* Need to check scope for variable declaration (VAR_DECL).
1017 For typedef (TYPE_DECL), scope is ignored. */
1018 if (TREE_CODE (newdecl) == VAR_DECL
1019 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1021 Two declarations for an object with C language linkage
1022 with the same name (ignoring the namespace that qualify
1023 it) that appear in different namespace scopes refer to
1025 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1028 if (TREE_TYPE (newdecl) == error_mark_node)
1029 types_match = TREE_TYPE (olddecl) == error_mark_node;
1030 else if (TREE_TYPE (olddecl) == NULL_TREE)
1031 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1032 else if (TREE_TYPE (newdecl) == NULL_TREE)
1035 types_match = comptypes (TREE_TYPE (newdecl),
1036 TREE_TYPE (olddecl),
1037 COMPARE_REDECLARATION);
1043 /* If NEWDECL is `static' and an `extern' was seen previously,
1044 warn about it. OLDDECL is the previous declaration.
1046 Note that this does not apply to the C++ case of declaring
1047 a variable `extern const' and then later `const'.
1049 Don't complain about built-in functions, since they are beyond
1050 the user's control. */
1053 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1055 if (TREE_CODE (newdecl) == TYPE_DECL
1056 || TREE_CODE (newdecl) == TEMPLATE_DECL
1057 || TREE_CODE (newdecl) == CONST_DECL
1058 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1061 /* Don't get confused by static member functions; that's a different
1063 if (TREE_CODE (newdecl) == FUNCTION_DECL
1064 && DECL_STATIC_FUNCTION_P (newdecl))
1067 /* If the old declaration was `static', or the new one isn't, then
1068 then everything is OK. */
1069 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1072 /* It's OK to declare a builtin function as `static'. */
1073 if (TREE_CODE (olddecl) == FUNCTION_DECL
1074 && DECL_ARTIFICIAL (olddecl))
1077 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1078 permerror (input_location, "previous declaration of %q+D", olddecl);
1081 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1082 function templates. If their exception specifications do not
1083 match, issue a diagnostic. */
1086 check_redeclaration_exception_specification (tree new_decl,
1091 tree new_exceptions;
1092 tree old_exceptions;
1094 new_type = TREE_TYPE (new_decl);
1095 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1096 old_type = TREE_TYPE (old_decl);
1097 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1101 If any declaration of a function has an exception-specification,
1102 all declarations, including the definition and an explicit
1103 specialization, of that function shall have an
1104 exception-specification with the same set of type-ids. */
1105 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1106 && ! DECL_IS_BUILTIN (old_decl)
1108 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1110 error ("declaration of %qF has a different exception specifier",
1112 error ("from previous declaration %q+F", old_decl);
1116 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1117 && lookup_attribute ("gnu_inline", \
1118 DECL_ATTRIBUTES (fn)))
1120 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1121 If the redeclaration is invalid, a diagnostic is issued, and the
1122 error_mark_node is returned. Otherwise, OLDDECL is returned.
1124 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1127 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1130 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1132 unsigned olddecl_uid = DECL_UID (olddecl);
1133 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1134 int new_defines_function = 0;
1135 tree new_template_info;
1137 if (newdecl == olddecl)
1140 types_match = decls_match (newdecl, olddecl);
1142 /* If either the type of the new decl or the type of the old decl is an
1143 error_mark_node, then that implies that we have already issued an
1144 error (earlier) for some bogus type specification, and in that case,
1145 it is rather pointless to harass the user with yet more error message
1146 about the same declaration, so just pretend the types match here. */
1147 if (TREE_TYPE (newdecl) == error_mark_node
1148 || TREE_TYPE (olddecl) == error_mark_node)
1149 return error_mark_node;
1151 if (DECL_P (olddecl)
1152 && TREE_CODE (newdecl) == FUNCTION_DECL
1153 && TREE_CODE (olddecl) == FUNCTION_DECL
1154 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1156 if (DECL_DECLARED_INLINE_P (newdecl)
1157 && DECL_UNINLINABLE (newdecl)
1158 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1159 /* Already warned elsewhere. */;
1160 else if (DECL_DECLARED_INLINE_P (olddecl)
1161 && DECL_UNINLINABLE (olddecl)
1162 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1163 /* Already warned. */;
1164 else if (DECL_DECLARED_INLINE_P (newdecl)
1165 && DECL_UNINLINABLE (olddecl)
1166 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1168 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1170 warning (OPT_Wattributes, "previous declaration of %q+D "
1171 "with attribute noinline", olddecl);
1173 else if (DECL_DECLARED_INLINE_P (olddecl)
1174 && DECL_UNINLINABLE (newdecl)
1175 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1177 warning (OPT_Wattributes, "function %q+D redeclared with "
1178 "attribute noinline", newdecl);
1179 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1184 /* Check for redeclaration and other discrepancies. */
1185 if (TREE_CODE (olddecl) == FUNCTION_DECL
1186 && DECL_ARTIFICIAL (olddecl))
1188 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1189 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1191 /* Avoid warnings redeclaring built-ins which have not been
1192 explicitly declared. */
1193 if (DECL_ANTICIPATED (olddecl))
1196 /* If you declare a built-in or predefined function name as static,
1197 the old definition is overridden, but optionally warn this was a
1198 bad choice of name. */
1199 if (! TREE_PUBLIC (newdecl))
1201 warning (OPT_Wshadow,
1202 DECL_BUILT_IN (olddecl)
1203 ? G_("shadowing built-in function %q#D")
1204 : G_("shadowing library function %q#D"), olddecl);
1205 /* Discard the old built-in function. */
1208 /* If the built-in is not ansi, then programs can override
1209 it even globally without an error. */
1210 else if (! DECL_BUILT_IN (olddecl))
1211 warning (0, "library function %q#D redeclared as non-function %q#D",
1215 error ("declaration of %q#D", newdecl);
1216 error ("conflicts with built-in declaration %q#D",
1221 else if (!types_match)
1223 /* Avoid warnings redeclaring built-ins which have not been
1224 explicitly declared. */
1225 if (DECL_ANTICIPATED (olddecl))
1227 /* Deal with fileptr_type_node. FILE type is not known
1228 at the time we create the builtins. */
1231 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1232 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1234 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1237 else if (TREE_VALUE (t2) == fileptr_type_node)
1239 tree t = TREE_VALUE (t1);
1241 if (TREE_CODE (t) == POINTER_TYPE
1242 && TYPE_NAME (TREE_TYPE (t))
1243 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1244 == get_identifier ("FILE")
1245 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1247 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1249 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1250 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1251 types_match = decls_match (newdecl, olddecl);
1253 return duplicate_decls (newdecl, olddecl,
1255 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1258 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1261 else if ((DECL_EXTERN_C_P (newdecl)
1262 && DECL_EXTERN_C_P (olddecl))
1263 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1264 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1266 /* A near match; override the builtin. */
1268 if (TREE_PUBLIC (newdecl))
1270 warning (0, "new declaration %q#D", newdecl);
1271 warning (0, "ambiguates built-in declaration %q#D",
1275 warning (OPT_Wshadow,
1276 DECL_BUILT_IN (olddecl)
1277 ? G_("shadowing built-in function %q#D")
1278 : G_("shadowing library function %q#D"), olddecl);
1281 /* Discard the old built-in function. */
1284 /* Replace the old RTL to avoid problems with inlining. */
1285 COPY_DECL_RTL (newdecl, olddecl);
1287 /* Even if the types match, prefer the new declarations type for
1288 built-ins which have not been explicitly declared, for
1289 exception lists, etc... */
1290 else if (DECL_SOURCE_LOCATION (olddecl) == BUILTINS_LOCATION)
1292 tree type = TREE_TYPE (newdecl);
1293 tree attribs = (*targetm.merge_type_attributes)
1294 (TREE_TYPE (olddecl), type);
1296 type = cp_build_type_attribute_variant (type, attribs);
1297 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1300 /* If a function is explicitly declared "throw ()", propagate that to
1301 the corresponding builtin. */
1302 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1303 && DECL_ANTICIPATED (olddecl)
1304 && TREE_NOTHROW (newdecl)
1305 && !TREE_NOTHROW (olddecl)
1306 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1307 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1309 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1311 /* Whether or not the builtin can throw exceptions has no
1312 bearing on this declarator. */
1313 TREE_NOTHROW (olddecl) = 0;
1315 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1317 /* If a builtin function is redeclared as `static', merge
1318 the declarations, but make the original one static. */
1319 DECL_THIS_STATIC (olddecl) = 1;
1320 TREE_PUBLIC (olddecl) = 0;
1322 /* Make the old declaration consistent with the new one so
1323 that all remnants of the builtin-ness of this function
1324 will be banished. */
1325 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1326 COPY_DECL_RTL (newdecl, olddecl);
1329 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1331 /* C++ Standard, 3.3, clause 4:
1332 "[Note: a namespace name or a class template name must be unique
1333 in its declarative region (7.3.2, clause 14). ]" */
1334 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1335 && TREE_CODE (newdecl) != NAMESPACE_DECL
1336 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1337 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1338 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1339 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1341 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1342 && TREE_CODE (newdecl) != TYPE_DECL)
1343 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1344 && TREE_CODE (olddecl) != TYPE_DECL))
1346 /* We do nothing special here, because C++ does such nasty
1347 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1348 get shadowed, and know that if we need to find a TYPE_DECL
1349 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1350 slot of the identifier. */
1354 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1355 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1356 || (TREE_CODE (olddecl) == FUNCTION_DECL
1357 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1361 error ("%q#D redeclared as different kind of symbol", newdecl);
1362 if (TREE_CODE (olddecl) == TREE_LIST)
1363 olddecl = TREE_VALUE (olddecl);
1364 error ("previous declaration of %q+#D", olddecl);
1366 return error_mark_node;
1368 else if (!types_match)
1370 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1371 /* These are certainly not duplicate declarations; they're
1372 from different scopes. */
1375 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1377 /* The name of a class template may not be declared to refer to
1378 any other template, class, function, object, namespace, value,
1379 or type in the same scope. */
1380 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1381 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1383 error ("declaration of template %q#D", newdecl);
1384 error ("conflicts with previous declaration %q+#D", olddecl);
1386 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1387 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1388 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1389 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1390 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1391 DECL_TEMPLATE_PARMS (olddecl))
1392 /* Template functions can be disambiguated by
1394 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1395 TREE_TYPE (TREE_TYPE (olddecl))))
1397 error ("new declaration %q#D", newdecl);
1398 error ("ambiguates old declaration %q+#D", olddecl);
1402 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1404 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1406 error ("declaration of C function %q#D conflicts with",
1408 error ("previous declaration %q+#D here", olddecl);
1410 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1411 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1413 error ("new declaration %q#D", newdecl);
1414 error ("ambiguates old declaration %q+#D", olddecl);
1415 return error_mark_node;
1422 error ("conflicting declaration %q#D", newdecl);
1423 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1424 return error_mark_node;
1427 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1428 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1429 && (!DECL_TEMPLATE_INFO (newdecl)
1430 || (DECL_TI_TEMPLATE (newdecl)
1431 != DECL_TI_TEMPLATE (olddecl))))
1432 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1433 && (!DECL_TEMPLATE_INFO (olddecl)
1434 || (DECL_TI_TEMPLATE (olddecl)
1435 != DECL_TI_TEMPLATE (newdecl))))))
1436 /* It's OK to have a template specialization and a non-template
1437 with the same type, or to have specializations of two
1438 different templates with the same type. Note that if one is a
1439 specialization, and the other is an instantiation of the same
1440 template, that we do not exit at this point. That situation
1441 can occur if we instantiate a template class, and then
1442 specialize one of its methods. This situation is valid, but
1443 the declarations must be merged in the usual way. */
1445 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1446 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1447 && !DECL_USE_TEMPLATE (newdecl))
1448 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1449 && !DECL_USE_TEMPLATE (olddecl))))
1450 /* One of the declarations is a template instantiation, and the
1451 other is not a template at all. That's OK. */
1453 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1455 /* In [namespace.alias] we have:
1457 In a declarative region, a namespace-alias-definition can be
1458 used to redefine a namespace-alias declared in that declarative
1459 region to refer only to the namespace to which it already
1462 Therefore, if we encounter a second alias directive for the same
1463 alias, we can just ignore the second directive. */
1464 if (DECL_NAMESPACE_ALIAS (newdecl)
1465 && (DECL_NAMESPACE_ALIAS (newdecl)
1466 == DECL_NAMESPACE_ALIAS (olddecl)))
1468 /* [namespace.alias]
1470 A namespace-name or namespace-alias shall not be declared as
1471 the name of any other entity in the same declarative region.
1472 A namespace-name defined at global scope shall not be
1473 declared as the name of any other entity in any global scope
1475 error ("declaration of namespace %qD conflicts with", newdecl);
1476 error ("previous declaration of namespace %q+D here", olddecl);
1477 return error_mark_node;
1481 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1484 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1485 if (DECL_NAME (olddecl) != NULL_TREE)
1486 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1487 ? "%q+#D previously defined here"
1488 : "%q+#D previously declared here", olddecl);
1489 return error_mark_node;
1491 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1492 && DECL_INITIAL (olddecl) != NULL_TREE
1493 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1494 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1496 /* Prototype decl follows defn w/o prototype. */
1497 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1498 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1499 "follows non-prototype definition here");
1501 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1502 || TREE_CODE (olddecl) == VAR_DECL)
1503 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1506 If two declarations of the same function or object
1507 specify different linkage-specifications ..., the program
1508 is ill-formed.... Except for functions with C++ linkage,
1509 a function declaration without a linkage specification
1510 shall not precede the first linkage specification for
1511 that function. A function can be declared without a
1512 linkage specification after an explicit linkage
1513 specification has been seen; the linkage explicitly
1514 specified in the earlier declaration is not affected by
1515 such a function declaration.
1517 DR 563 raises the question why the restrictions on
1518 functions should not also apply to objects. Older
1519 versions of G++ silently ignore the linkage-specification
1527 which is clearly wrong. Therefore, we now treat objects
1529 if (current_lang_depth () == 0)
1531 /* There is no explicit linkage-specification, so we use
1532 the linkage from the previous declaration. */
1533 if (!DECL_LANG_SPECIFIC (newdecl))
1534 retrofit_lang_decl (newdecl);
1535 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1539 error ("previous declaration of %q+#D with %qL linkage",
1540 olddecl, DECL_LANGUAGE (olddecl));
1541 error ("conflicts with new declaration with %qL linkage",
1542 DECL_LANGUAGE (newdecl));
1546 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1548 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1550 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1551 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1554 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1555 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1557 for (; t1 && t1 != void_list_node;
1558 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1559 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1561 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1564 permerror (input_location, "default argument given for parameter %d of %q#D",
1566 permerror (input_location, "after previous specification in %q+#D", olddecl);
1570 error ("default argument given for parameter %d of %q#D",
1572 error ("after previous specification in %q+#D",
1579 /* Do not merge an implicit typedef with an explicit one. In:
1583 typedef class A A __attribute__ ((foo));
1585 the attribute should apply only to the typedef. */
1586 if (TREE_CODE (olddecl) == TYPE_DECL
1587 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1588 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1591 /* If new decl is `static' and an `extern' was seen previously,
1593 warn_extern_redeclared_static (newdecl, olddecl);
1595 /* We have committed to returning 1 at this point. */
1596 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1598 /* Now that functions must hold information normally held
1599 by field decls, there is extra work to do so that
1600 declaration information does not get destroyed during
1602 if (DECL_VINDEX (olddecl))
1603 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1604 if (DECL_CONTEXT (olddecl))
1605 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1606 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1607 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1608 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1609 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1610 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1611 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1612 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1613 SET_OVERLOADED_OPERATOR_CODE
1614 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1615 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1617 /* Optionally warn about more than one declaration for the same
1618 name, but don't warn about a function declaration followed by a
1620 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1621 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1622 /* Don't warn about extern decl followed by definition. */
1623 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1624 /* Don't warn about friends, let add_friend take care of it. */
1625 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1627 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1628 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1631 if (DECL_DELETED_FN (newdecl))
1633 error ("deleted definition of %qD", newdecl);
1634 error ("after previous declaration %q+D", olddecl);
1638 /* Deal with C++: must preserve virtual function table size. */
1639 if (TREE_CODE (olddecl) == TYPE_DECL)
1641 tree newtype = TREE_TYPE (newdecl);
1642 tree oldtype = TREE_TYPE (olddecl);
1644 if (newtype != error_mark_node && oldtype != error_mark_node
1645 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1646 CLASSTYPE_FRIEND_CLASSES (newtype)
1647 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1649 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1652 /* Copy all the DECL_... slots specified in the new decl
1653 except for any that we copy here from the old type. */
1654 DECL_ATTRIBUTES (newdecl)
1655 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1657 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1661 old_result = DECL_TEMPLATE_RESULT (olddecl);
1662 new_result = DECL_TEMPLATE_RESULT (newdecl);
1663 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1664 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1665 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1666 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1668 DECL_ATTRIBUTES (old_result)
1669 = (*targetm.merge_decl_attributes) (old_result, new_result);
1671 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1673 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1674 && DECL_INITIAL (new_result))
1676 if (DECL_INITIAL (old_result))
1677 DECL_UNINLINABLE (old_result) = 1;
1679 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1680 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1681 DECL_NOT_REALLY_EXTERN (old_result)
1682 = DECL_NOT_REALLY_EXTERN (new_result);
1683 DECL_INTERFACE_KNOWN (old_result)
1684 = DECL_INTERFACE_KNOWN (new_result);
1685 DECL_DECLARED_INLINE_P (old_result)
1686 = DECL_DECLARED_INLINE_P (new_result);
1687 DECL_DISREGARD_INLINE_LIMITS (old_result)
1688 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1693 DECL_DECLARED_INLINE_P (old_result)
1694 |= DECL_DECLARED_INLINE_P (new_result);
1695 DECL_DISREGARD_INLINE_LIMITS (old_result)
1696 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1697 check_redeclaration_exception_specification (newdecl, olddecl);
1701 /* If the new declaration is a definition, update the file and
1702 line information on the declaration, and also make
1703 the old declaration the same definition. */
1704 if (DECL_INITIAL (new_result) != NULL_TREE)
1706 DECL_SOURCE_LOCATION (olddecl)
1707 = DECL_SOURCE_LOCATION (old_result)
1708 = DECL_SOURCE_LOCATION (newdecl);
1709 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1710 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1713 DECL_ARGUMENTS (old_result)
1714 = DECL_ARGUMENTS (new_result);
1715 for (parm = DECL_ARGUMENTS (old_result); parm;
1716 parm = TREE_CHAIN (parm))
1717 DECL_CONTEXT (parm) = old_result;
1726 /* Automatically handles default parameters. */
1727 tree oldtype = TREE_TYPE (olddecl);
1730 /* Merge the data types specified in the two decls. */
1731 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1733 /* If merge_types produces a non-typedef type, just use the old type. */
1734 if (TREE_CODE (newdecl) == TYPE_DECL
1735 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1738 if (TREE_CODE (newdecl) == VAR_DECL)
1740 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1741 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1742 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1743 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1744 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1745 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1747 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1748 if (DECL_LANG_SPECIFIC (olddecl)
1749 && CP_DECL_THREADPRIVATE_P (olddecl))
1751 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1752 if (!DECL_LANG_SPECIFIC (newdecl))
1753 retrofit_lang_decl (newdecl);
1755 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1756 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1760 /* Do this after calling `merge_types' so that default
1761 parameters don't confuse us. */
1762 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1763 check_redeclaration_exception_specification (newdecl, olddecl);
1764 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1766 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1767 check_default_args (newdecl);
1769 /* Lay the type out, unless already done. */
1770 if (! same_type_p (newtype, oldtype)
1771 && TREE_TYPE (newdecl) != error_mark_node
1772 && !(processing_template_decl && uses_template_parms (newdecl)))
1773 layout_type (TREE_TYPE (newdecl));
1775 if ((TREE_CODE (newdecl) == VAR_DECL
1776 || TREE_CODE (newdecl) == PARM_DECL
1777 || TREE_CODE (newdecl) == RESULT_DECL
1778 || TREE_CODE (newdecl) == FIELD_DECL
1779 || TREE_CODE (newdecl) == TYPE_DECL)
1780 && !(processing_template_decl && uses_template_parms (newdecl)))
1781 layout_decl (newdecl, 0);
1783 /* Merge the type qualifiers. */
1784 if (TREE_READONLY (newdecl))
1785 TREE_READONLY (olddecl) = 1;
1786 if (TREE_THIS_VOLATILE (newdecl))
1787 TREE_THIS_VOLATILE (olddecl) = 1;
1788 if (TREE_NOTHROW (newdecl))
1789 TREE_NOTHROW (olddecl) = 1;
1791 /* Merge deprecatedness. */
1792 if (TREE_DEPRECATED (newdecl))
1793 TREE_DEPRECATED (olddecl) = 1;
1795 /* Preserve function specific target and optimization options */
1796 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1798 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1799 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1800 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1801 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1803 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1804 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1805 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1806 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1809 /* Merge the initialization information. */
1810 if (DECL_INITIAL (newdecl) == NULL_TREE
1811 && DECL_INITIAL (olddecl) != NULL_TREE)
1813 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1814 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1815 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1817 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1818 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1822 /* Merge the section attribute.
1823 We want to issue an error if the sections conflict but that must be
1824 done later in decl_attributes since we are called before attributes
1826 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1827 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1829 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1831 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1832 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1833 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1834 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1835 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1836 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1837 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1838 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1839 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1840 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1841 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1842 /* Keep the old RTL. */
1843 COPY_DECL_RTL (olddecl, newdecl);
1845 else if (TREE_CODE (newdecl) == VAR_DECL
1846 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1848 /* Keep the old RTL. We cannot keep the old RTL if the old
1849 declaration was for an incomplete object and the new
1850 declaration is not since many attributes of the RTL will
1852 COPY_DECL_RTL (olddecl, newdecl);
1855 /* If cannot merge, then use the new type and qualifiers,
1856 and don't preserve the old rtl. */
1859 /* Clean out any memory we had of the old declaration. */
1860 tree oldstatic = value_member (olddecl, static_aggregates);
1862 TREE_VALUE (oldstatic) = error_mark_node;
1864 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1865 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1866 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1867 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1870 /* Merge the storage class information. */
1871 merge_weak (newdecl, olddecl);
1873 if (DECL_ONE_ONLY (olddecl))
1874 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1876 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1877 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1878 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1879 if (! DECL_EXTERNAL (olddecl))
1880 DECL_EXTERNAL (newdecl) = 0;
1882 new_template_info = NULL_TREE;
1883 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1885 bool new_redefines_gnu_inline = false;
1887 if (new_defines_function
1888 && ((DECL_INTERFACE_KNOWN (olddecl)
1889 && TREE_CODE (olddecl) == FUNCTION_DECL)
1890 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1891 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1892 == FUNCTION_DECL))))
1896 if (TREE_CODE (fn) == TEMPLATE_DECL)
1897 fn = DECL_TEMPLATE_RESULT (olddecl);
1899 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1902 if (!new_redefines_gnu_inline)
1904 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1905 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1906 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1908 DECL_TEMPLATE_INSTANTIATED (newdecl)
1909 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1910 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1912 /* If the OLDDECL is an instantiation and/or specialization,
1913 then the NEWDECL must be too. But, it may not yet be marked
1914 as such if the caller has created NEWDECL, but has not yet
1915 figured out that it is a redeclaration. */
1916 if (!DECL_USE_TEMPLATE (newdecl))
1917 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1919 /* Don't really know how much of the language-specific
1920 values we should copy from old to new. */
1921 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1922 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1923 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1924 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1926 if (LANG_DECL_HAS_MIN (newdecl))
1928 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1929 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1930 if (DECL_TEMPLATE_INFO (newdecl))
1931 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1932 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1934 /* Only functions have these fields. */
1935 if (TREE_CODE (newdecl) == FUNCTION_DECL
1936 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1938 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1939 olddecl_friend = DECL_FRIEND_P (olddecl);
1940 hidden_friend = (DECL_ANTICIPATED (olddecl)
1941 && DECL_HIDDEN_FRIEND_P (olddecl)
1942 && newdecl_is_friend);
1943 DECL_BEFRIENDING_CLASSES (newdecl)
1944 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1945 DECL_BEFRIENDING_CLASSES (olddecl));
1946 /* DECL_THUNKS is only valid for virtual functions,
1947 otherwise it is a DECL_FRIEND_CONTEXT. */
1948 if (DECL_VIRTUAL_P (newdecl))
1949 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1951 /* Only variables have this field. */
1952 else if (TREE_CODE (newdecl) == VAR_DECL
1953 && VAR_HAD_UNKNOWN_BOUND (olddecl))
1954 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
1957 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1961 /* Merge parameter attributes. */
1962 tree oldarg, newarg;
1963 for (oldarg = DECL_ARGUMENTS(olddecl),
1964 newarg = DECL_ARGUMENTS(newdecl);
1966 oldarg = TREE_CHAIN(oldarg), newarg = TREE_CHAIN(newarg)) {
1967 DECL_ATTRIBUTES (newarg)
1968 = (*targetm.merge_decl_attributes) (oldarg, newarg);
1969 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
1972 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1973 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1975 /* If newdecl is not a specialization, then it is not a
1976 template-related function at all. And that means that we
1977 should have exited above, returning 0. */
1978 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1980 if (DECL_ODR_USED (olddecl))
1981 /* From [temp.expl.spec]:
1983 If a template, a member template or the member of a class
1984 template is explicitly specialized then that
1985 specialization shall be declared before the first use of
1986 that specialization that would cause an implicit
1987 instantiation to take place, in every translation unit in
1988 which such a use occurs. */
1989 error ("explicit specialization of %qD after first use",
1992 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1994 /* Don't propagate visibility from the template to the
1995 specialization here. We'll do that in determine_visibility if
1997 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1999 /* [temp.expl.spec/14] We don't inline explicit specialization
2000 just because the primary template says so. */
2002 else if (new_defines_function && DECL_INITIAL (olddecl))
2004 /* Never inline re-defined extern inline functions.
2005 FIXME: this could be better handled by keeping both
2006 function as separate declarations. */
2007 DECL_UNINLINABLE (newdecl) = 1;
2011 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2012 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2014 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2016 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2017 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2019 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2020 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2021 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2022 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2025 /* Preserve abstractness on cloned [cd]tors. */
2026 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2028 /* Update newdecl's parms to point at olddecl. */
2029 for (parm = DECL_ARGUMENTS (newdecl); parm;
2030 parm = TREE_CHAIN (parm))
2031 DECL_CONTEXT (parm) = olddecl;
2035 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2036 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2037 COPY_DECL_RTL (newdecl, olddecl);
2039 if (! types_match || new_defines_function)
2041 /* These need to be copied so that the names are available.
2042 Note that if the types do match, we'll preserve inline
2043 info and other bits, but if not, we won't. */
2044 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2045 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2047 if (new_defines_function)
2048 /* If defining a function declared with other language
2049 linkage, use the previously declared language linkage. */
2050 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2051 else if (types_match)
2053 /* If redeclaring a builtin function, and not a definition,
2054 it stays built in. */
2055 if (DECL_BUILT_IN (olddecl))
2057 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2058 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2059 /* If we're keeping the built-in definition, keep the rtl,
2060 regardless of declaration matches. */
2061 COPY_DECL_RTL (olddecl, newdecl);
2064 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2065 /* Don't clear out the arguments if we're just redeclaring a
2067 if (DECL_ARGUMENTS (olddecl))
2068 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2071 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2072 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2074 /* Now preserve various other info from the definition. */
2075 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2076 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2077 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2078 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2080 /* Warn about conflicting visibility specifications. */
2081 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2082 && DECL_VISIBILITY_SPECIFIED (newdecl)
2083 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2085 warning_at (input_location, OPT_Wattributes,
2086 "%q+D: visibility attribute ignored because it", newdecl);
2087 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2088 "conflicts with previous declaration here");
2090 /* Choose the declaration which specified visibility. */
2091 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2093 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2094 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2096 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2097 so keep this behavior. */
2098 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2100 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2101 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2104 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2105 with that from NEWDECL below. */
2106 if (DECL_LANG_SPECIFIC (olddecl))
2108 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2109 != DECL_LANG_SPECIFIC (newdecl));
2110 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2113 /* Merge the USED information. */
2114 if (TREE_USED (olddecl))
2115 TREE_USED (newdecl) = 1;
2116 else if (TREE_USED (newdecl))
2117 TREE_USED (olddecl) = 1;
2118 if (TREE_CODE (newdecl) == VAR_DECL)
2120 if (DECL_READ_P (olddecl))
2121 DECL_READ_P (newdecl) = 1;
2122 else if (DECL_READ_P (newdecl))
2123 DECL_READ_P (olddecl) = 1;
2125 if (DECL_PRESERVE_P (olddecl))
2126 DECL_PRESERVE_P (newdecl) = 1;
2127 else if (DECL_PRESERVE_P (newdecl))
2128 DECL_PRESERVE_P (olddecl) = 1;
2130 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2134 function_size = sizeof (struct tree_decl_common);
2136 memcpy ((char *) olddecl + sizeof (struct tree_common),
2137 (char *) newdecl + sizeof (struct tree_common),
2138 function_size - sizeof (struct tree_common));
2140 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2141 (char *) newdecl + sizeof (struct tree_decl_common),
2142 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2143 if (new_template_info)
2144 /* If newdecl is a template instantiation, it is possible that
2145 the following sequence of events has occurred:
2147 o A friend function was declared in a class template. The
2148 class template was instantiated.
2150 o The instantiation of the friend declaration was
2151 recorded on the instantiation list, and is newdecl.
2153 o Later, however, instantiate_class_template called pushdecl
2154 on the newdecl to perform name injection. But, pushdecl in
2155 turn called duplicate_decls when it discovered that another
2156 declaration of a global function with the same name already
2159 o Here, in duplicate_decls, we decided to clobber newdecl.
2161 If we're going to do that, we'd better make sure that
2162 olddecl, and not newdecl, is on the list of
2163 instantiations so that if we try to do the instantiation
2164 again we won't get the clobbered declaration. */
2165 reregister_specialization (newdecl,
2171 size_t size = tree_code_size (TREE_CODE (olddecl));
2172 memcpy ((char *) olddecl + sizeof (struct tree_common),
2173 (char *) newdecl + sizeof (struct tree_common),
2174 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2175 switch (TREE_CODE (olddecl))
2185 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2186 (char *) newdecl + sizeof (struct tree_decl_common),
2187 size - sizeof (struct tree_decl_common)
2188 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2192 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2193 (char *) newdecl + sizeof (struct tree_decl_common),
2194 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2195 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2199 DECL_UID (olddecl) = olddecl_uid;
2201 DECL_FRIEND_P (olddecl) = 1;
2204 DECL_ANTICIPATED (olddecl) = 1;
2205 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2208 /* NEWDECL contains the merged attribute lists.
2209 Update OLDDECL to be the same. */
2210 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2212 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2213 so that encode_section_info has a chance to look at the new decl
2214 flags and attributes. */
2215 if (DECL_RTL_SET_P (olddecl)
2216 && (TREE_CODE (olddecl) == FUNCTION_DECL
2217 || (TREE_CODE (olddecl) == VAR_DECL
2218 && TREE_STATIC (olddecl))))
2219 make_decl_rtl (olddecl);
2221 /* The NEWDECL will no longer be needed. Because every out-of-class
2222 declaration of a member results in a call to duplicate_decls,
2223 freeing these nodes represents in a significant savings. */
2229 /* Return zero if the declaration NEWDECL is valid
2230 when the declaration OLDDECL (assumed to be for the same name)
2231 has already been seen.
2232 Otherwise return an error message format string with a %s
2233 where the identifier should go. */
2236 redeclaration_error_message (tree newdecl, tree olddecl)
2238 if (TREE_CODE (newdecl) == TYPE_DECL)
2240 /* Because C++ can put things into name space for free,
2241 constructs like "typedef struct foo { ... } foo"
2242 would look like an erroneous redeclaration. */
2243 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2246 return G_("redefinition of %q#D");
2248 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2250 /* If this is a pure function, its olddecl will actually be
2251 the original initialization to `0' (which we force to call
2252 abort()). Don't complain about redefinition in this case. */
2253 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2254 && DECL_INITIAL (olddecl) == NULL_TREE)
2257 /* If both functions come from different namespaces, this is not
2258 a redeclaration - this is a conflict with a used function. */
2259 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2260 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2261 && ! decls_match (olddecl, newdecl))
2262 return G_("%qD conflicts with used function");
2264 /* We'll complain about linkage mismatches in
2265 warn_extern_redeclared_static. */
2267 /* Defining the same name twice is no good. */
2268 if (DECL_INITIAL (olddecl) != NULL_TREE
2269 && DECL_INITIAL (newdecl) != NULL_TREE)
2271 if (DECL_NAME (olddecl) == NULL_TREE)
2272 return G_("%q#D not declared in class");
2273 else if (!GNU_INLINE_P (olddecl)
2274 || GNU_INLINE_P (newdecl))
2275 return G_("redefinition of %q#D");
2278 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2280 bool olda = GNU_INLINE_P (olddecl);
2281 bool newa = GNU_INLINE_P (newdecl);
2286 return G_("%q+D redeclared inline with "
2287 "%<gnu_inline%> attribute");
2289 return G_("%q+D redeclared inline without "
2290 "%<gnu_inline%> attribute");
2296 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2300 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2302 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2303 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2304 return G_("redefinition of %q#D");
2308 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2309 || (DECL_TEMPLATE_RESULT (newdecl)
2310 == DECL_TEMPLATE_RESULT (olddecl)))
2313 nt = DECL_TEMPLATE_RESULT (newdecl);
2314 if (DECL_TEMPLATE_INFO (nt))
2315 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2316 ot = DECL_TEMPLATE_RESULT (olddecl);
2317 if (DECL_TEMPLATE_INFO (ot))
2318 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2319 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2320 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2321 return G_("redefinition of %q#D");
2323 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2325 bool olda = GNU_INLINE_P (ot);
2326 bool newa = GNU_INLINE_P (nt);
2331 return G_("%q+D redeclared inline with "
2332 "%<gnu_inline%> attribute");
2334 return G_("%q+D redeclared inline without "
2335 "%<gnu_inline%> attribute");
2339 /* Core issue #226 (C++0x):
2341 If a friend function template declaration specifies a
2342 default template-argument, that declaration shall be a
2343 definition and shall be the only declaration of the
2344 function template in the translation unit. */
2345 if ((cxx_dialect != cxx98)
2346 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2347 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2348 /*is_primary=*/1, /*is_partial=*/0,
2349 /*is_friend_decl=*/2))
2350 return G_("redeclaration of friend %q#D "
2351 "may not have default template arguments");
2355 else if (TREE_CODE (newdecl) == VAR_DECL
2356 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2357 && (! DECL_LANG_SPECIFIC (olddecl)
2358 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2359 || DECL_THREAD_LOCAL_P (newdecl)))
2361 /* Only variables can be thread-local, and all declarations must
2362 agree on this property. */
2363 if (DECL_THREAD_LOCAL_P (newdecl))
2364 return G_("thread-local declaration of %q#D follows "
2365 "non-thread-local declaration");
2367 return G_("non-thread-local declaration of %q#D follows "
2368 "thread-local declaration");
2370 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2372 /* The objects have been declared at namespace scope. If either
2373 is a member of an anonymous union, then this is an invalid
2374 redeclaration. For example:
2380 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2381 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2382 return G_("redeclaration of %q#D");
2383 /* If at least one declaration is a reference, there is no
2384 conflict. For example:
2390 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2392 /* Reject two definitions. */
2393 return G_("redefinition of %q#D");
2397 /* Objects declared with block scope: */
2398 /* Reject two definitions, and reject a definition
2399 together with an external reference. */
2400 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2401 return G_("redeclaration of %q#D");
2406 /* Hash and equality functions for the named_label table. */
2409 named_label_entry_hash (const void *data)
2411 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2412 return DECL_UID (ent->label_decl);
2416 named_label_entry_eq (const void *a, const void *b)
2418 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2419 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2420 return ent_a->label_decl == ent_b->label_decl;
2423 /* Create a new label, named ID. */
2426 make_label_decl (tree id, int local_p)
2428 struct named_label_entry *ent;
2432 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2434 DECL_CONTEXT (decl) = current_function_decl;
2435 DECL_MODE (decl) = VOIDmode;
2436 C_DECLARED_LABEL_FLAG (decl) = local_p;
2438 /* Say where one reference is to the label, for the sake of the
2439 error if it is not defined. */
2440 DECL_SOURCE_LOCATION (decl) = input_location;
2442 /* Record the fact that this identifier is bound to this label. */
2443 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2445 /* Create the label htab for the function on demand. */
2447 named_labels = htab_create_ggc (13, named_label_entry_hash,
2448 named_label_entry_eq, NULL);
2450 /* Record this label on the list of labels used in this function.
2451 We do this before calling make_label_decl so that we get the
2452 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2453 ent = ggc_alloc_cleared_named_label_entry ();
2454 ent->label_decl = decl;
2456 slot = htab_find_slot (named_labels, ent, INSERT);
2457 gcc_assert (*slot == NULL);
2463 /* Look for a label named ID in the current function. If one cannot
2464 be found, create one. (We keep track of used, but undefined,
2465 labels, and complain about them at the end of a function.) */
2468 lookup_label (tree id)
2472 timevar_push (TV_NAME_LOOKUP);
2473 /* You can't use labels at global scope. */
2474 if (current_function_decl == NULL_TREE)
2476 error ("label %qE referenced outside of any function", id);
2477 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2480 /* See if we've already got this label. */
2481 decl = IDENTIFIER_LABEL_VALUE (id);
2482 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2483 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2485 decl = make_label_decl (id, /*local_p=*/0);
2486 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2489 /* Declare a local label named ID. */
2492 declare_local_label (tree id)
2496 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2497 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2498 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2499 current_binding_level->shadowed_labels);
2500 current_binding_level->shadowed_labels = shadow;
2502 decl = make_label_decl (id, /*local_p=*/1);
2503 TREE_VALUE (shadow) = decl;
2508 /* Returns nonzero if it is ill-formed to jump past the declaration of
2509 DECL. Returns 2 if it's also a real problem. */
2512 decl_jump_unsafe (tree decl)
2514 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2515 with automatic storage duration is not in scope to a point where it is
2516 in scope is ill-formed unless the variable has scalar type, class type
2517 with a trivial default constructor and a trivial destructor, a
2518 cv-qualified version of one of these types, or an array of one of the
2519 preceding types and is declared without an initializer (8.5). */
2520 tree type = TREE_TYPE (decl);
2522 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2523 || type == error_mark_node)
2526 type = strip_array_types (type);
2528 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2529 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2532 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2538 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2541 identify_goto (tree decl, const location_t *locus)
2544 permerror (input_location, "jump to label %qD", decl);
2546 permerror (input_location, "jump to case label");
2548 permerror (*locus, " from here");
2551 /* Check that a single previously seen jump to a newly defined label
2552 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2553 the jump context; NAMES are the names in scope in LEVEL at the jump
2554 context; LOCUS is the source position of the jump or 0. Returns
2555 true if all is well. */
2558 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2559 bool exited_omp, const location_t *locus)
2561 struct cp_binding_level *b;
2562 bool identified = false, saw_eh = false, saw_omp = false;
2566 identify_goto (decl, locus);
2567 error (" exits OpenMP structured block");
2568 identified = saw_omp = true;
2571 for (b = current_binding_level; b ; b = b->level_chain)
2573 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2575 for (new_decls = b->names; new_decls != old_decls;
2576 new_decls = TREE_CHAIN (new_decls))
2578 int problem = decl_jump_unsafe (new_decls);
2584 identify_goto (decl, locus);
2588 error (" crosses initialization of %q+#D", new_decls);
2590 permerror (input_location, " enters scope of %q+#D which has "
2591 "non-trivial destructor", new_decls);
2596 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2600 identify_goto (decl, locus);
2603 if (b->kind == sk_try)
2604 error (" enters try block");
2606 error (" enters catch block");
2609 if (b->kind == sk_omp && !saw_omp)
2613 identify_goto (decl, locus);
2616 error (" enters OpenMP structured block");
2625 check_previous_goto (tree decl, struct named_label_use_entry *use)
2627 check_previous_goto_1 (decl, use->binding_level,
2628 use->names_in_scope, use->in_omp_scope,
2629 &use->o_goto_locus);
2633 check_switch_goto (struct cp_binding_level* level)
2635 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2638 /* Check that a new jump to a label DECL is OK. Called by
2639 finish_goto_stmt. */
2642 check_goto (tree decl)
2644 struct named_label_entry *ent, dummy;
2645 bool saw_catch = false, identified = false;
2648 /* We can't know where a computed goto is jumping.
2649 So we assume that it's OK. */
2650 if (TREE_CODE (decl) != LABEL_DECL)
2653 /* We didn't record any information about this label when we created it,
2654 and there's not much point since it's trivial to analyze as a return. */
2655 if (decl == cdtor_label)
2658 dummy.label_decl = decl;
2659 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2660 gcc_assert (ent != NULL);
2662 /* If the label hasn't been defined yet, defer checking. */
2663 if (! DECL_INITIAL (decl))
2665 struct named_label_use_entry *new_use;
2667 /* Don't bother creating another use if the last goto had the
2668 same data, and will therefore create the same set of errors. */
2670 && ent->uses->names_in_scope == current_binding_level->names)
2673 new_use = ggc_alloc_named_label_use_entry ();
2674 new_use->binding_level = current_binding_level;
2675 new_use->names_in_scope = current_binding_level->names;
2676 new_use->o_goto_locus = input_location;
2677 new_use->in_omp_scope = false;
2679 new_use->next = ent->uses;
2680 ent->uses = new_use;
2684 if (ent->in_try_scope || ent->in_catch_scope
2685 || ent->in_omp_scope || ent->bad_decls)
2687 permerror (input_location, "jump to label %q+D", decl);
2688 permerror (input_location, " from here");
2692 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2694 tree b = TREE_VALUE (bad);
2695 int u = decl_jump_unsafe (b);
2697 if (u > 1 && DECL_ARTIFICIAL (b))
2699 /* Can't skip init of __exception_info. */
2700 error_at (DECL_SOURCE_LOCATION (b), " enters catch block");
2704 error (" skips initialization of %q+#D", b);
2706 permerror (input_location, " enters scope of %q+#D which has "
2707 "non-trivial destructor", b);
2710 if (ent->in_try_scope)
2711 error (" enters try block");
2712 else if (ent->in_catch_scope && !saw_catch)
2713 error (" enters catch block");
2715 if (ent->in_omp_scope)
2716 error (" enters OpenMP structured block");
2717 else if (flag_openmp)
2719 struct cp_binding_level *b;
2720 for (b = current_binding_level; b ; b = b->level_chain)
2722 if (b == ent->binding_level)
2724 if (b->kind == sk_omp)
2728 permerror (input_location, "jump to label %q+D", decl);
2729 permerror (input_location, " from here");
2732 error (" exits OpenMP structured block");
2739 /* Check that a return is ok wrt OpenMP structured blocks.
2740 Called by finish_return_stmt. Returns true if all is well. */
2743 check_omp_return (void)
2745 struct cp_binding_level *b;
2746 for (b = current_binding_level; b ; b = b->level_chain)
2747 if (b->kind == sk_omp)
2749 error ("invalid exit from OpenMP structured block");
2755 /* Define a label, specifying the location in the source file.
2756 Return the LABEL_DECL node for the label. */
2759 define_label (location_t location, tree name)
2761 struct named_label_entry *ent, dummy;
2762 struct cp_binding_level *p;
2765 timevar_push (TV_NAME_LOOKUP);
2767 decl = lookup_label (name);
2769 dummy.label_decl = decl;
2770 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2771 gcc_assert (ent != NULL);
2773 /* After labels, make any new cleanups in the function go into their
2774 own new (temporary) binding contour. */
2775 for (p = current_binding_level;
2776 p->kind != sk_function_parms;
2778 p->more_cleanups_ok = 0;
2780 if (name == get_identifier ("wchar_t"))
2781 permerror (input_location, "label named wchar_t");
2783 if (DECL_INITIAL (decl) != NULL_TREE)
2785 error ("duplicate label %qD", decl);
2786 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2790 struct named_label_use_entry *use;
2792 /* Mark label as having been defined. */
2793 DECL_INITIAL (decl) = error_mark_node;
2794 /* Say where in the source. */
2795 DECL_SOURCE_LOCATION (decl) = location;
2797 ent->binding_level = current_binding_level;
2798 ent->names_in_scope = current_binding_level->names;
2800 for (use = ent->uses; use ; use = use->next)
2801 check_previous_goto (decl, use);
2805 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2810 struct cp_binding_level *level;
2811 struct cp_switch *next;
2812 /* The SWITCH_STMT being built. */
2814 /* A splay-tree mapping the low element of a case range to the high
2815 element, or NULL_TREE if there is no high element. Used to
2816 determine whether or not a new case label duplicates an old case
2817 label. We need a tree, rather than simply a hash table, because
2818 of the GNU case range extension. */
2822 /* A stack of the currently active switch statements. The innermost
2823 switch statement is on the top of the stack. There is no need to
2824 mark the stack for garbage collection because it is only active
2825 during the processing of the body of a function, and we never
2826 collect at that point. */
2828 static struct cp_switch *switch_stack;
2830 /* Called right after a switch-statement condition is parsed.
2831 SWITCH_STMT is the switch statement being parsed. */
2834 push_switch (tree switch_stmt)
2836 struct cp_switch *p = XNEW (struct cp_switch);
2837 p->level = current_binding_level;
2838 p->next = switch_stack;
2839 p->switch_stmt = switch_stmt;
2840 p->cases = splay_tree_new (case_compare, NULL, NULL);
2847 struct cp_switch *cs = switch_stack;
2848 location_t switch_location;
2850 /* Emit warnings as needed. */
2851 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2852 switch_location = EXPR_LOCATION (cs->switch_stmt);
2854 switch_location = input_location;
2855 if (!processing_template_decl)
2856 c_do_switch_warnings (cs->cases, switch_location,
2857 SWITCH_STMT_TYPE (cs->switch_stmt),
2858 SWITCH_STMT_COND (cs->switch_stmt));
2860 splay_tree_delete (cs->cases);
2861 switch_stack = switch_stack->next;
2865 /* Note that we've seen a definition of a case label, and complain if this
2866 is a bad place for one. */
2869 finish_case_label (location_t loc, tree low_value, tree high_value)
2872 struct cp_binding_level *p;
2874 if (processing_template_decl)
2878 /* For templates, just add the case label; we'll do semantic
2879 analysis at instantiation-time. */
2880 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2881 return add_stmt (build_case_label (loc, low_value, high_value, label));
2884 /* Find the condition on which this switch statement depends. */
2885 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2886 if (cond && TREE_CODE (cond) == TREE_LIST)
2887 cond = TREE_VALUE (cond);
2889 if (!check_switch_goto (switch_stack->level))
2890 return error_mark_node;
2892 r = c_add_case_label (loc, switch_stack->cases, cond,
2893 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2894 low_value, high_value);
2896 /* After labels, make any new cleanups in the function go into their
2897 own new (temporary) binding contour. */
2898 for (p = current_binding_level;
2899 p->kind != sk_function_parms;
2901 p->more_cleanups_ok = 0;
2906 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2909 typename_hash (const void* k)
2912 const_tree const t = (const_tree) k;
2914 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2915 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2920 typedef struct typename_info {
2928 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2929 really of type `typename_info*' */
2932 typename_compare (const void * k1, const void * k2)
2934 const_tree const t1 = (const_tree) k1;
2935 const typename_info *const t2 = (const typename_info *) k2;
2937 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2938 && TYPE_CONTEXT (t1) == t2->scope
2939 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2940 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2941 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2944 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2945 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2947 Returns the new TYPENAME_TYPE. */
2949 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2952 build_typename_type (tree context, tree name, tree fullname,
2953 enum tag_types tag_type)
2961 if (typename_htab == NULL)
2962 typename_htab = htab_create_ggc (61, &typename_hash,
2963 &typename_compare, NULL);
2965 ti.scope = FROB_CONTEXT (context);
2967 ti.template_id = fullname;
2968 ti.enum_p = tag_type == enum_type;
2969 ti.class_p = (tag_type == class_type
2970 || tag_type == record_type
2971 || tag_type == union_type);
2972 hash = (htab_hash_pointer (ti.scope)
2973 ^ htab_hash_pointer (ti.name));
2975 /* See if we already have this type. */
2976 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2981 /* Build the TYPENAME_TYPE. */
2982 t = cxx_make_type (TYPENAME_TYPE);
2983 TYPE_CONTEXT (t) = ti.scope;
2984 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2985 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2986 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2988 /* Build the corresponding TYPE_DECL. */
2989 d = build_decl (input_location, TYPE_DECL, name, t);
2990 TYPE_NAME (TREE_TYPE (d)) = d;
2991 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2992 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2993 DECL_ARTIFICIAL (d) = 1;
2995 /* Store it in the hash table. */
2998 /* TYPENAME_TYPEs must always be compared structurally, because
2999 they may or may not resolve down to another type depending on
3000 the currently open classes. */
3001 SET_TYPE_STRUCTURAL_EQUALITY (t);
3007 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3008 provided to name the type. Returns an appropriate type, unless an
3009 error occurs, in which case error_mark_node is returned. If we
3010 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3011 return that, rather than the _TYPE it corresponds to, in other
3012 cases we look through the type decl. If TF_ERROR is set, complain
3013 about errors, otherwise be quiet. */
3016 make_typename_type (tree context, tree name, enum tag_types tag_type,
3017 tsubst_flags_t complain)
3023 if (name == error_mark_node
3024 || context == NULL_TREE
3025 || context == error_mark_node)
3026 return error_mark_node;
3030 if (!(TYPE_LANG_SPECIFIC (name)
3031 && (CLASSTYPE_IS_TEMPLATE (name)
3032 || CLASSTYPE_USE_TEMPLATE (name))))
3033 name = TYPE_IDENTIFIER (name);
3035 /* Create a TEMPLATE_ID_EXPR for the type. */
3036 name = build_nt (TEMPLATE_ID_EXPR,
3037 CLASSTYPE_TI_TEMPLATE (name),
3038 CLASSTYPE_TI_ARGS (name));
3040 else if (TREE_CODE (name) == TYPE_DECL)
3041 name = DECL_NAME (name);
3045 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3047 name = TREE_OPERAND (name, 0);
3048 if (TREE_CODE (name) == TEMPLATE_DECL)
3049 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3050 else if (TREE_CODE (name) == OVERLOAD)
3052 error ("%qD is not a type", name);
3053 return error_mark_node;
3056 if (TREE_CODE (name) == TEMPLATE_DECL)
3058 error ("%qD used without template parameters", name);
3059 return error_mark_node;
3061 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3062 gcc_assert (TYPE_P (context));
3064 if (!MAYBE_CLASS_TYPE_P (context))
3066 if (complain & tf_error)
3067 error ("%q#T is not a class", context);
3068 return error_mark_node;
3071 /* When the CONTEXT is a dependent type, NAME could refer to a
3072 dependent base class of CONTEXT. But look inside it anyway
3073 if CONTEXT is a currently open scope, in case it refers to a
3074 member of the current instantiation or a non-dependent base;
3075 lookup will stop when we hit a dependent base. */
3076 if (!dependent_scope_p (context))
3077 /* We should only set WANT_TYPE when we're a nested typename type.
3078 Then we can give better diagnostics if we find a non-type. */
3079 t = lookup_field (context, name, 2, /*want_type=*/true);
3083 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3084 return build_typename_type (context, name, fullname, tag_type);
3086 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3090 if (complain & tf_error)
3091 error (want_template ? "no class template named %q#T in %q#T"
3092 : "no type named %q#T in %q#T", name, context);
3093 return error_mark_node;
3096 /* Pull out the template from an injected-class-name (or multiple). */
3098 t = maybe_get_template_decl_from_type_decl (t);
3100 if (TREE_CODE (t) == TREE_LIST)
3102 if (complain & tf_error)
3104 error ("lookup of %qT in %qT is ambiguous", name, context);
3105 print_candidates (t);
3107 return error_mark_node;
3110 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3112 if (complain & tf_error)
3113 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3115 return error_mark_node;
3117 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3119 if (complain & tf_error)
3120 error ("%<typename %T::%D%> names %q#T, which is not a type",
3122 return error_mark_node;
3125 if (complain & tf_error)
3126 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3128 /* If we are currently parsing a template and if T is a typedef accessed
3129 through CONTEXT then we need to remember and check access of T at
3130 template instantiation time. */
3131 add_typedef_to_current_template_for_access_check (t, context, input_location);
3134 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3136 /*entering_scope=*/0,
3137 tf_warning_or_error | tf_user);
3139 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3145 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3146 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3147 in which case error_mark_node is returned.
3149 If PARM_LIST is non-NULL, also make sure that the template parameter
3150 list of TEMPLATE_DECL matches.
3152 If COMPLAIN zero, don't complain about any errors that occur. */
3155 make_unbound_class_template (tree context, tree name, tree parm_list,
3156 tsubst_flags_t complain)
3162 name = TYPE_IDENTIFIER (name);
3163 else if (DECL_P (name))
3164 name = DECL_NAME (name);
3165 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3167 if (!dependent_type_p (context)
3168 || currently_open_class (context))
3170 tree tmpl = NULL_TREE;
3172 if (MAYBE_CLASS_TYPE_P (context))
3173 tmpl = lookup_field (context, name, 0, false);
3175 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3177 if (complain & tf_error)
3178 error ("no class template named %q#T in %q#T", name, context);
3179 return error_mark_node;
3183 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3185 if (complain & tf_error)
3187 error ("template parameters do not match template");
3188 error ("%q+D declared here", tmpl);
3190 return error_mark_node;
3193 if (complain & tf_error)
3194 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3199 /* Build the UNBOUND_CLASS_TEMPLATE. */
3200 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3201 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3202 TREE_TYPE (t) = NULL_TREE;
3203 SET_TYPE_STRUCTURAL_EQUALITY (t);
3205 /* Build the corresponding TEMPLATE_DECL. */
3206 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3207 TYPE_NAME (TREE_TYPE (d)) = d;
3208 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3209 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3210 DECL_ARTIFICIAL (d) = 1;
3211 DECL_TEMPLATE_PARMS (d) = parm_list;
3218 /* Push the declarations of builtin types into the namespace.
3219 RID_INDEX is the index of the builtin type in the array
3220 RID_POINTERS. NAME is the name used when looking up the builtin
3221 type. TYPE is the _TYPE node for the builtin type. */
3224 record_builtin_type (enum rid rid_index,
3228 tree rname = NULL_TREE, tname = NULL_TREE;
3229 tree tdecl = NULL_TREE;
3231 if ((int) rid_index < (int) RID_MAX)
3232 rname = ridpointers[(int) rid_index];
3234 tname = get_identifier (name);
3236 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3237 eliminated. Built-in types should not be looked up name; their
3238 names are keywords that the parser can recognize. However, there
3239 is code in c-common.c that uses identifier_global_value to look
3240 up built-in types by name. */
3243 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3244 DECL_ARTIFICIAL (tdecl) = 1;
3245 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3251 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3252 DECL_ARTIFICIAL (tdecl) = 1;
3254 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3257 if (!TYPE_NAME (type))
3258 TYPE_NAME (type) = tdecl;
3261 debug_hooks->type_decl (tdecl, 0);
3264 /* Record one of the standard Java types.
3265 * Declare it as having the given NAME.
3266 * If SIZE > 0, it is the size of one of the integral types;
3267 * otherwise it is the negative of the size of one of the other types. */
3270 record_builtin_java_type (const char* name, int size)
3274 type = build_nonstandard_integer_type (size, 0);
3275 else if (size > -32)
3278 /* "__java_char" or ""__java_boolean". */
3279 type = build_nonstandard_integer_type (-size, 1);
3280 /* Get the signed type cached and attached to the unsigned type,
3281 so it doesn't get garbage-collected at "random" times,
3282 causing potential codegen differences out of different UIDs
3283 and different alias set numbers. */
3284 stype = build_nonstandard_integer_type (-size, 0);
3285 TREE_CHAIN (type) = stype;
3286 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3289 { /* "__java_float" or ""__java_double". */
3290 type = make_node (REAL_TYPE);
3291 TYPE_PRECISION (type) = - size;
3294 record_builtin_type (RID_MAX, name, type);
3295 decl = TYPE_NAME (type);
3297 /* Suppress generate debug symbol entries for these types,
3298 since for normal C++ they are just clutter.
3299 However, push_lang_context undoes this if extern "Java" is seen. */
3300 DECL_IGNORED_P (decl) = 1;
3302 TYPE_FOR_JAVA (type) = 1;
3306 /* Push a type into the namespace so that the back ends ignore it. */
3309 record_unknown_type (tree type, const char* name)
3311 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3312 TYPE_DECL, get_identifier (name), type));
3313 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3314 DECL_IGNORED_P (decl) = 1;
3315 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3316 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3317 TYPE_ALIGN (type) = 1;
3318 TYPE_USER_ALIGN (type) = 0;
3319 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3322 /* A string for which we should create an IDENTIFIER_NODE at
3325 typedef struct predefined_identifier
3327 /* The name of the identifier. */
3328 const char *const name;
3329 /* The place where the IDENTIFIER_NODE should be stored. */
3331 /* Nonzero if this is the name of a constructor or destructor. */
3332 const int ctor_or_dtor_p;
3333 } predefined_identifier;
3335 /* Create all the predefined identifiers. */
3338 initialize_predefined_identifiers (void)
3340 const predefined_identifier *pid;
3342 /* A table of identifiers to create at startup. */
3343 static const predefined_identifier predefined_identifiers[] = {
3344 { "C++", &lang_name_cplusplus, 0 },
3345 { "C", &lang_name_c, 0 },
3346 { "Java", &lang_name_java, 0 },
3347 /* Some of these names have a trailing space so that it is
3348 impossible for them to conflict with names written by users. */
3349 { "__ct ", &ctor_identifier, 1 },
3350 { "__base_ctor ", &base_ctor_identifier, 1 },
3351 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3352 { "__dt ", &dtor_identifier, 1 },
3353 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3354 { "__base_dtor ", &base_dtor_identifier, 1 },
3355 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3356 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3357 { "nelts", &nelts_identifier, 0 },
3358 { THIS_NAME, &this_identifier, 0 },
3359 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3360 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3361 { "_vptr", &vptr_identifier, 0 },
3362 { "__vtt_parm", &vtt_parm_identifier, 0 },
3363 { "::", &global_scope_name, 0 },
3364 { "std", &std_identifier, 0 },
3368 for (pid = predefined_identifiers; pid->name; ++pid)
3370 *pid->node = get_identifier (pid->name);
3371 if (pid->ctor_or_dtor_p)
3372 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3376 /* Create the predefined scalar types of C,
3377 and some nodes representing standard constants (0, 1, (void *)0).
3378 Initialize the global binding level.
3379 Make definitions for built-in primitive functions. */
3382 cxx_init_decl_processing (void)
3385 tree void_ftype_ptr;
3387 build_common_tree_nodes (flag_signed_char);
3389 /* Create all the identifiers we need. */
3390 initialize_predefined_identifiers ();
3392 /* Create the global variables. */
3393 push_to_top_level ();
3395 current_function_decl = NULL_TREE;
3396 current_binding_level = NULL;
3397 /* Enter the global namespace. */
3398 gcc_assert (global_namespace == NULL_TREE);
3399 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3401 TREE_PUBLIC (global_namespace) = 1;
3402 begin_scope (sk_namespace, global_namespace);
3404 current_lang_name = NULL_TREE;
3406 if (flag_visibility_ms_compat)
3407 default_visibility = VISIBILITY_HIDDEN;
3410 current_lang_name = lang_name_c;
3412 /* Create the `std' namespace. */
3413 push_namespace (std_identifier);
3414 std_node = current_namespace;
3417 c_common_nodes_and_builtins ();
3419 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3420 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3421 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3422 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3423 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3424 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3425 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3426 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3428 integer_two_node = build_int_cst (NULL_TREE, 2);
3429 integer_three_node = build_int_cst (NULL_TREE, 3);
3431 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3432 truthvalue_type_node = boolean_type_node;
3433 truthvalue_false_node = boolean_false_node;
3434 truthvalue_true_node = boolean_true_node;
3436 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3437 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3438 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3441 record_builtin_type (RID_MAX, NULL, string_type_node);
3444 delta_type_node = ptrdiff_type_node;
3445 vtable_index_type = ptrdiff_type_node;
3447 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3448 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3449 void_ftype_ptr = build_function_type_list (void_type_node,
3450 ptr_type_node, NULL_TREE);
3452 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3454 /* C++ extensions */
3456 unknown_type_node = make_node (LANG_TYPE);
3457 record_unknown_type (unknown_type_node, "unknown type");
3459 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3460 TREE_TYPE (unknown_type_node) = unknown_type_node;
3462 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3464 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3465 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3467 init_list_type_node = make_node (LANG_TYPE);
3468 record_unknown_type (init_list_type_node, "init list");
3471 /* Make sure we get a unique function type, so we can give
3472 its pointer type a name. (This wins for gdb.) */
3473 tree vfunc_type = make_node (FUNCTION_TYPE);
3474 TREE_TYPE (vfunc_type) = integer_type_node;
3475 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3476 layout_type (vfunc_type);
3478 vtable_entry_type = build_pointer_type (vfunc_type);
3480 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3483 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3484 layout_type (vtbl_type_node);
3485 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3486 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3487 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3488 layout_type (vtbl_ptr_type_node);
3489 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3491 push_namespace (get_identifier ("__cxxabiv1"));
3492 abi_node = current_namespace;
3495 global_type_node = make_node (LANG_TYPE);
3496 record_unknown_type (global_type_node, "global type");
3499 current_lang_name = lang_name_cplusplus;
3502 tree newtype, deltype;
3503 tree ptr_ftype_sizetype;
3507 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3508 if (cxx_dialect == cxx98)
3511 tree bad_alloc_type_node;
3512 tree bad_alloc_decl;
3514 push_namespace (std_identifier);
3515 bad_alloc_id = get_identifier ("bad_alloc");
3516 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3517 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3519 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3520 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3524 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3527 new_eh_spec = noexcept_false_spec;
3529 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3530 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3531 push_cp_library_fn (NEW_EXPR, newtype);
3532 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3533 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3534 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3536 nullptr_type_node = make_node (LANG_TYPE);
3537 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3538 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3539 TYPE_UNSIGNED (nullptr_type_node) = 1;
3540 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3541 SET_TYPE_MODE (nullptr_type_node, Pmode);
3542 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3543 nullptr_node = make_node (INTEGER_CST);
3544 TREE_TYPE (nullptr_node) = nullptr_type_node;
3548 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3550 /* Perform other language dependent initializations. */
3551 init_class_processing ();
3552 init_rtti_processing ();
3553 init_template_processing ();
3555 if (flag_exceptions)
3556 init_exception_processing ();
3558 if (! supports_one_only ())
3561 make_fname_decl = cp_make_fname_decl;
3562 start_fname_decls ();
3564 /* Show we use EH for cleanups. */
3565 if (flag_exceptions)
3566 using_eh_for_cleanups ();
3569 /* Generate an initializer for a function naming variable from
3570 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3571 filled in with the type of the init. */
3574 cp_fname_init (const char* name, tree *type_p)
3576 tree domain = NULL_TREE;
3578 tree init = NULL_TREE;
3583 length = strlen (name);
3584 domain = build_index_type (size_int (length));
3585 init = build_string (length + 1, name);
3588 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3589 type = build_cplus_array_type (type, domain);
3594 TREE_TYPE (init) = type;
3596 init = error_mark_node;
3601 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3602 the decl, LOC is the location to give the decl, NAME is the
3603 initialization string and TYPE_DEP indicates whether NAME depended
3604 on the type of the function. We make use of that to detect
3605 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3606 at the point of first use, so we mustn't push the decl now. */
3609 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3611 const char *const name = (type_dep && processing_template_decl
3612 ? NULL : fname_as_string (type_dep));
3614 tree init = cp_fname_init (name, &type);
3615 tree decl = build_decl (loc, VAR_DECL, id, type);
3618 free (CONST_CAST (char *, name));
3620 /* As we're using pushdecl_with_scope, we must set the context. */
3621 DECL_CONTEXT (decl) = current_function_decl;
3622 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3624 TREE_STATIC (decl) = 1;
3625 TREE_READONLY (decl) = 1;
3626 DECL_ARTIFICIAL (decl) = 1;
3628 TREE_USED (decl) = 1;
3630 if (current_function_decl)
3632 struct cp_binding_level *b = current_binding_level;
3633 while (b->level_chain->kind != sk_function_parms)
3635 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3636 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3637 LOOKUP_ONLYCONVERTING);
3640 pushdecl_top_level_and_finish (decl, init);
3646 builtin_function_1 (tree decl, tree context, bool is_global)
3648 tree id = DECL_NAME (decl);
3649 const char *name = IDENTIFIER_POINTER (id);
3651 retrofit_lang_decl (decl);
3653 DECL_ARTIFICIAL (decl) = 1;
3654 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3655 SET_DECL_LANGUAGE (decl, lang_c);
3656 /* Runtime library routines are, by definition, available in an
3657 external shared object. */
3658 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3659 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3661 DECL_CONTEXT (decl) = context;
3664 pushdecl_top_level (decl);
3668 /* A function in the user's namespace should have an explicit
3669 declaration before it is used. Mark the built-in function as
3670 anticipated but not actually declared. */
3671 if (name[0] != '_' || name[1] != '_')
3672 DECL_ANTICIPATED (decl) = 1;
3673 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3675 size_t len = strlen (name);
3677 /* Treat __*_chk fortification functions as anticipated as well,
3678 unless they are __builtin_*. */
3679 if (len > strlen ("___chk")
3680 && memcmp (name + len - strlen ("_chk"),
3681 "_chk", strlen ("_chk") + 1) == 0)
3682 DECL_ANTICIPATED (decl) = 1;
3689 cxx_builtin_function (tree decl)
3691 tree id = DECL_NAME (decl);
3692 const char *name = IDENTIFIER_POINTER (id);
3693 /* All builtins that don't begin with an '_' should additionally
3694 go in the 'std' namespace. */
3697 tree decl2 = copy_node(decl);
3698 push_namespace (std_identifier);
3699 builtin_function_1 (decl2, std_node, false);
3703 return builtin_function_1 (decl, NULL_TREE, false);
3706 /* Like cxx_builtin_function, but guarantee the function is added to the global
3707 scope. This is to allow function specific options to add new machine
3708 dependent builtins when the target ISA changes via attribute((target(...)))
3709 which saves space on program startup if the program does not use non-generic
3713 cxx_builtin_function_ext_scope (tree decl)
3716 tree id = DECL_NAME (decl);
3717 const char *name = IDENTIFIER_POINTER (id);
3718 /* All builtins that don't begin with an '_' should additionally
3719 go in the 'std' namespace. */
3722 tree decl2 = copy_node(decl);
3723 push_namespace (std_identifier);
3724 builtin_function_1 (decl2, std_node, true);
3728 return builtin_function_1 (decl, NULL_TREE, true);
3731 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3732 function. Not called directly. */
3735 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3737 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3738 DECL_EXTERNAL (fn) = 1;
3739 TREE_PUBLIC (fn) = 1;
3740 DECL_ARTIFICIAL (fn) = 1;
3741 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3742 SET_DECL_LANGUAGE (fn, lang_c);
3743 /* Runtime library routines are, by definition, available in an
3744 external shared object. */
3745 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3746 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3750 /* Returns the _DECL for a library function with C linkage.
3751 We assume that such functions never throw; if this is incorrect,
3752 callers should unset TREE_NOTHROW. */
3755 build_library_fn (tree name, tree type)
3757 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3758 TREE_NOTHROW (fn) = 1;
3762 /* Returns the _DECL for a library function with C++ linkage. */
3765 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3767 tree fn = build_library_fn_1 (name, operator_code, type);
3768 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3769 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3770 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3774 /* Like build_library_fn, but takes a C string instead of an
3778 build_library_fn_ptr (const char* name, tree type)
3780 return build_library_fn (get_identifier (name), type);
3783 /* Like build_cp_library_fn, but takes a C string instead of an
3787 build_cp_library_fn_ptr (const char* name, tree type)
3789 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3792 /* Like build_library_fn, but also pushes the function so that we will
3793 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3794 may throw exceptions listed in RAISES. */
3797 push_library_fn (tree name, tree type, tree raises)
3802 type = build_exception_variant (type, raises);
3804 fn = build_library_fn (name, type);
3805 pushdecl_top_level (fn);
3809 /* Like build_cp_library_fn, but also pushes the function so that it
3810 will be found by normal lookup. */
3813 push_cp_library_fn (enum tree_code operator_code, tree type)
3815 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3822 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3826 push_void_library_fn (tree name, tree parmtypes)
3828 tree type = build_function_type (void_type_node, parmtypes);
3829 return push_library_fn (name, type, NULL_TREE);
3832 /* Like push_library_fn, but also note that this function throws
3833 and does not return. Used for __throw_foo and the like. */
3836 push_throw_library_fn (tree name, tree type)
3838 tree fn = push_library_fn (name, type, NULL_TREE);
3839 TREE_THIS_VOLATILE (fn) = 1;
3840 TREE_NOTHROW (fn) = 0;
3844 /* When we call finish_struct for an anonymous union, we create
3845 default copy constructors and such. But, an anonymous union
3846 shouldn't have such things; this function undoes the damage to the
3847 anonymous union type T.
3849 (The reason that we create the synthesized methods is that we don't
3850 distinguish `union { int i; }' from `typedef union { int i; } U'.
3851 The first is an anonymous union; the second is just an ordinary
3855 fixup_anonymous_aggr (tree t)
3859 /* Wipe out memory of synthesized methods. */
3860 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3861 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3862 TYPE_HAS_INIT_REF (t) = 0;
3863 TYPE_HAS_CONST_INIT_REF (t) = 0;
3864 TYPE_HAS_ASSIGN_REF (t) = 0;
3865 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3867 /* Splice the implicitly generated functions out of the TYPE_METHODS
3869 q = &TYPE_METHODS (t);
3872 if (DECL_ARTIFICIAL (*q))
3873 *q = TREE_CHAIN (*q);
3875 q = &TREE_CHAIN (*q);
3878 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3879 if (TYPE_METHODS (t))
3881 tree decl = TYPE_MAIN_DECL (t);
3883 if (TREE_CODE (t) != UNION_TYPE)
3884 error_at (DECL_SOURCE_LOCATION (decl),
3885 "an anonymous struct cannot have function members");
3887 error_at (DECL_SOURCE_LOCATION (decl),
3888 "an anonymous union cannot have function members");
3891 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3892 assignment operators (because they cannot have these methods themselves).
3893 For anonymous unions this is already checked because they are not allowed
3894 in any union, otherwise we have to check it. */
3895 if (TREE_CODE (t) != UNION_TYPE)
3899 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3900 if (TREE_CODE (field) == FIELD_DECL)
3902 type = TREE_TYPE (field);
3903 if (CLASS_TYPE_P (type))
3905 if (TYPE_NEEDS_CONSTRUCTING (type))
3906 error ("member %q+#D with constructor not allowed "
3907 "in anonymous aggregate", field);
3908 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3909 error ("member %q+#D with destructor not allowed "
3910 "in anonymous aggregate", field);
3911 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3912 error ("member %q+#D with copy assignment operator "
3913 "not allowed in anonymous aggregate", field);
3919 /* Make sure that a declaration with no declarator is well-formed, i.e.
3920 just declares a tagged type or anonymous union.
3922 Returns the type declared; or NULL_TREE if none. */
3925 check_tag_decl (cp_decl_specifier_seq *declspecs)
3927 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3928 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3929 /* If a class, struct, or enum type is declared by the DECLSPECS
3930 (i.e, if a class-specifier, enum-specifier, or non-typename
3931 elaborated-type-specifier appears in the DECLSPECS),
3932 DECLARED_TYPE is set to the corresponding type. */
3933 tree declared_type = NULL_TREE;
3934 bool error_p = false;
3936 if (declspecs->multiple_types_p)
3937 error ("multiple types in one declaration");
3938 else if (declspecs->redefined_builtin_type)
3940 if (!in_system_header)
3941 permerror (input_location, "redeclaration of C++ built-in type %qT",
3942 declspecs->redefined_builtin_type);
3947 && TYPE_P (declspecs->type)
3948 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3949 && MAYBE_CLASS_TYPE_P (declspecs->type))
3950 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3951 declared_type = declspecs->type;
3952 else if (declspecs->type == error_mark_node)
3954 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3955 permerror (input_location, "declaration does not declare anything");
3956 /* Check for an anonymous union. */
3957 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3958 && TYPE_ANONYMOUS_P (declared_type))
3960 /* 7/3 In a simple-declaration, the optional init-declarator-list
3961 can be omitted only when declaring a class (clause 9) or
3962 enumeration (7.2), that is, when the decl-specifier-seq contains
3963 either a class-specifier, an elaborated-type-specifier with
3964 a class-key (9.1), or an enum-specifier. In these cases and
3965 whenever a class-specifier or enum-specifier is present in the
3966 decl-specifier-seq, the identifiers in these specifiers are among
3967 the names being declared by the declaration (as class-name,
3968 enum-names, or enumerators, depending on the syntax). In such
3969 cases, and except for the declaration of an unnamed bit-field (9.6),
3970 the decl-specifier-seq shall introduce one or more names into the
3971 program, or shall redeclare a name introduced by a previous
3972 declaration. [Example:
3973 enum { }; // ill-formed
3974 typedef class { }; // ill-formed
3978 error ("missing type-name in typedef-declaration");
3981 /* Anonymous unions are objects, so they can have specifiers. */;
3982 SET_ANON_AGGR_TYPE_P (declared_type);
3984 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3985 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3990 if (declspecs->specs[(int)ds_inline]
3991 || declspecs->specs[(int)ds_virtual])
3992 error ("%qs can only be specified for functions",
3993 declspecs->specs[(int)ds_inline]
3994 ? "inline" : "virtual");
3996 && (!current_class_type
3997 || current_scope () != current_class_type))
3998 error ("%<friend%> can only be specified inside a class");
3999 else if (declspecs->specs[(int)ds_explicit])
4000 error ("%<explicit%> can only be specified for constructors");
4001 else if (declspecs->storage_class)
4002 error ("a storage class can only be specified for objects "
4004 else if (declspecs->specs[(int)ds_const]
4005 || declspecs->specs[(int)ds_volatile]
4006 || declspecs->specs[(int)ds_restrict]
4007 || declspecs->specs[(int)ds_thread])
4008 error ("qualifiers can only be specified for objects "
4010 else if (saw_typedef)
4011 warning (0, "%<typedef%> was ignored in this declaration");
4012 else if (declspecs->specs[(int) ds_constexpr])
4013 error ("%<constexpr> cannot be used for type declarations");
4016 return declared_type;
4019 /* Called when a declaration is seen that contains no names to declare.
4020 If its type is a reference to a structure, union or enum inherited
4021 from a containing scope, shadow that tag name for the current scope
4022 with a forward reference.
4023 If its type defines a new named structure or union
4024 or defines an enum, it is valid but we need not do anything here.
4025 Otherwise, it is an error.
4027 C++: may have to grok the declspecs to learn about static,
4028 complain for anonymous unions.
4030 Returns the TYPE declared -- or NULL_TREE if none. */
4033 shadow_tag (cp_decl_specifier_seq *declspecs)
4035 tree t = check_tag_decl (declspecs);
4040 if (declspecs->attributes)
4042 warning (0, "attribute ignored in declaration of %q+#T", t);
4043 warning (0, "attribute for %q+#T must follow the %qs keyword",
4044 t, class_key_or_enum_as_string (t));
4048 if (maybe_process_partial_specialization (t) == error_mark_node)
4051 /* This is where the variables in an anonymous union are
4052 declared. An anonymous union declaration looks like:
4054 because there is no declarator after the union, the parser
4055 sends that declaration here. */
4056 if (ANON_AGGR_TYPE_P (t))
4058 fixup_anonymous_aggr (t);
4060 if (TYPE_FIELDS (t))
4062 tree decl = grokdeclarator (/*declarator=*/NULL,
4063 declspecs, NORMAL, 0, NULL);
4064 finish_anon_union (decl);
4071 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4074 groktypename (cp_decl_specifier_seq *type_specifiers,
4075 const cp_declarator *declarator,
4076 bool is_template_arg)
4080 enum decl_context context
4081 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4082 attrs = type_specifiers->attributes;
4083 type_specifiers->attributes = NULL_TREE;
4084 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4085 if (attrs && type != error_mark_node)
4087 if (CLASS_TYPE_P (type))
4088 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4089 "outside of definition", type);
4090 else if (MAYBE_CLASS_TYPE_P (type))
4091 /* A template type parameter or other dependent type. */
4092 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4093 "type %qT without an associated declaration", type);
4095 cplus_decl_attributes (&type, attrs, 0);
4100 /* Process a DECLARATOR for a function-scope variable declaration,
4101 namespace-scope variable declaration, or function declaration.
4102 (Function definitions go through start_function; class member
4103 declarations appearing in the body of the class go through
4104 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4105 If an error occurs, the error_mark_node is returned instead.
4107 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4108 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4109 for an explicitly defaulted function, or SD_DELETED for an explicitly
4110 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4111 implicitly initialized via a default constructor. ATTRIBUTES and
4112 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4113 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4114 set, the caller is responsible for calling pop_scope. */
4117 start_decl (const cp_declarator *declarator,
4118 cp_decl_specifier_seq *declspecs,
4121 tree prefix_attributes,
4122 tree *pushed_scope_p)
4130 *pushed_scope_p = NULL_TREE;
4132 /* An object declared as __attribute__((deprecated)) suppresses
4133 warnings of uses of other deprecated items. */
4134 if (lookup_attribute ("deprecated", attributes))
4135 deprecated_state = DEPRECATED_SUPPRESS;
4137 attributes = chainon (attributes, prefix_attributes);
4139 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4142 deprecated_state = DEPRECATED_NORMAL;
4144 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4145 || decl == error_mark_node)
4146 return error_mark_node;
4148 context = DECL_CONTEXT (decl);
4152 *pushed_scope_p = push_scope (context);
4154 /* We are only interested in class contexts, later. */
4155 if (TREE_CODE (context) == NAMESPACE_DECL)
4156 context = NULL_TREE;
4160 /* Is it valid for this decl to have an initializer at all?
4161 If not, set INITIALIZED to zero, which will indirectly
4162 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4163 switch (TREE_CODE (decl))
4166 error ("typedef %qD is initialized (use decltype instead)", decl);
4167 return error_mark_node;
4170 if (initialized == SD_DELETED)
4171 /* We'll handle the rest of the semantics later, but we need to
4172 set this now so it's visible to duplicate_decls. */
4173 DECL_DELETED_FN (decl) = 1;
4182 if (! toplevel_bindings_p ()
4183 && DECL_EXTERNAL (decl))
4184 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4186 DECL_EXTERNAL (decl) = 0;
4187 if (toplevel_bindings_p ())
4188 TREE_STATIC (decl) = 1;
4190 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4192 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4193 record_key_method_defined (decl);
4195 /* If this is a typedef that names the class for linkage purposes
4196 (7.1.3p8), apply any attributes directly to the type. */
4197 if (TREE_CODE (decl) == TYPE_DECL
4198 && TAGGED_TYPE_P (TREE_TYPE (decl))
4199 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4200 flags = ATTR_FLAG_TYPE_IN_PLACE;
4204 /* Set attributes here so if duplicate decl, will have proper attributes. */
4205 cplus_decl_attributes (&decl, attributes, flags);
4207 /* Dllimported symbols cannot be defined. Static data members (which
4208 can be initialized in-class and dllimported) go through grokfield,
4209 not here, so we don't need to exclude those decls when checking for
4211 if (initialized && DECL_DLLIMPORT_P (decl))
4213 error ("definition of %q#D is marked %<dllimport%>", decl);
4214 DECL_DLLIMPORT_P (decl) = 0;
4217 /* If #pragma weak was used, mark the decl weak now. */
4218 maybe_apply_pragma_weak (decl);
4220 if (TREE_CODE (decl) == FUNCTION_DECL
4221 && DECL_DECLARED_INLINE_P (decl)
4222 && DECL_UNINLINABLE (decl)
4223 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4224 warning (0, "inline function %q+D given attribute noinline", decl);
4226 if (context && COMPLETE_TYPE_P (complete_type (context)))
4228 if (TREE_CODE (decl) == VAR_DECL)
4230 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4231 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4232 error ("%q#D is not a static member of %q#T", decl, context);
4235 if (DECL_CONTEXT (field) != context)
4237 if (!same_type_p (DECL_CONTEXT (field), context))
4238 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4239 "to be defined as %<%T::%D%>",
4240 DECL_CONTEXT (field), DECL_NAME (decl),
4241 context, DECL_NAME (decl));
4242 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4244 if (processing_specialization
4245 && template_class_depth (context) == 0
4246 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4247 error ("template header not allowed in member definition "
4248 "of explicitly specialized class");
4249 /* Static data member are tricky; an in-class initialization
4250 still doesn't provide a definition, so the in-class
4251 declaration will have DECL_EXTERNAL set, but will have an
4252 initialization. Thus, duplicate_decls won't warn
4253 about this situation, and so we check here. */
4254 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4255 error ("duplicate initialization of %qD", decl);
4256 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4258 if (declspecs->specs[(int) ds_constexpr]
4259 && !DECL_DECLARED_CONSTEXPR_P (field))
4260 error ("%qD declared %<constexpr%> outside its class", field);
4265 tree field = check_classfn (context, decl,
4266 (processing_template_decl
4267 > template_class_depth (context))
4268 ? current_template_parms
4270 if (field && field != error_mark_node
4271 && duplicate_decls (decl, field,
4272 /*newdecl_is_friend=*/false))
4276 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4277 DECL_IN_AGGR_P (decl) = 0;
4278 /* Do not mark DECL as an explicit specialization if it was not
4279 already marked as an instantiation; a declaration should
4280 never be marked as a specialization unless we know what
4281 template is being specialized. */
4282 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4284 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4286 /* [temp.expl.spec] An explicit specialization of a static data
4287 member of a template is a definition if the declaration
4288 includes an initializer; otherwise, it is a declaration.
4290 We check for processing_specialization so this only applies
4291 to the new specialization syntax. */
4292 if (!initialized && processing_specialization)
4293 DECL_EXTERNAL (decl) = 1;
4296 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4297 /* Aliases are definitions. */
4299 permerror (input_location, "declaration of %q#D outside of class is not definition",
4302 if (!ensure_literal_type_for_constexpr_object (decl))
4303 return error_mark_node;
4306 was_public = TREE_PUBLIC (decl);
4308 /* Enter this declaration into the symbol table. */
4309 decl = maybe_push_decl (decl);
4311 if (processing_template_decl)
4312 decl = push_template_decl (decl);
4313 if (decl == error_mark_node)
4314 return error_mark_node;
4316 /* Tell the back end to use or not use .common as appropriate. If we say
4317 -fconserve-space, we want this to save .data space, at the expense of
4318 wrong semantics. If we say -fno-conserve-space, we want this to
4319 produce errors about redefs; to do this we force variables into the
4321 if (flag_conserve_space
4322 && TREE_CODE (decl) == VAR_DECL
4323 && TREE_PUBLIC (decl)
4324 && !DECL_THREAD_LOCAL_P (decl)
4325 && !have_global_bss_p ())
4326 DECL_COMMON (decl) = 1;
4328 if (TREE_CODE (decl) == VAR_DECL
4329 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4330 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4332 /* This is a const variable with implicit 'static'. Set
4333 DECL_THIS_STATIC so we can tell it from variables that are
4334 !TREE_PUBLIC because of the anonymous namespace. */
4335 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)));
4336 DECL_THIS_STATIC (decl) = 1;
4339 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4340 start_decl_1 (decl, initialized);
4345 /* Process the declaration of a variable DECL. INITIALIZED is true
4346 iff DECL is explicitly initialized. (INITIALIZED is false if the
4347 variable is initialized via an implicitly-called constructor.)
4348 This function must be called for ordinary variables (including, for
4349 example, implicit instantiations of templates), but must not be
4350 called for template declarations. */
4353 start_decl_1 (tree decl, bool initialized)
4357 bool aggregate_definition_p;
4359 gcc_assert (!processing_template_decl);
4361 if (error_operand_p (decl))
4364 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4366 type = TREE_TYPE (decl);
4367 complete_p = COMPLETE_TYPE_P (type);
4368 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4370 /* If an explicit initializer is present, or if this is a definition
4371 of an aggregate, then we need a complete type at this point.
4372 (Scalars are always complete types, so there is nothing to
4373 check.) This code just sets COMPLETE_P; errors (if necessary)
4374 are issued below. */
4375 if ((initialized || aggregate_definition_p)
4377 && COMPLETE_TYPE_P (complete_type (type)))
4380 /* We will not yet have set TREE_READONLY on DECL if the type
4381 was "const", but incomplete, before this point. But, now, we
4382 have a complete type, so we can try again. */
4383 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4387 /* Is it valid for this decl to have an initializer at all? */
4389 /* Don't allow initializations for incomplete types except for
4390 arrays which might be completed by the initialization. */
4392 ; /* A complete type is ok. */
4393 else if (type_uses_auto (type))
4394 ; /* An auto type is ok. */
4395 else if (TREE_CODE (type) != ARRAY_TYPE)
4397 error ("variable %q#D has initializer but incomplete type", decl);
4398 type = TREE_TYPE (decl) = error_mark_node;
4400 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4402 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4403 error ("elements of array %q#D have incomplete type", decl);
4404 /* else we already gave an error in start_decl. */
4407 else if (aggregate_definition_p && !complete_p)
4409 if (type_uses_auto (type))
4410 error ("declaration of %q#D has no initializer", decl);
4412 error ("aggregate %q#D has incomplete type and cannot be defined",
4414 /* Change the type so that assemble_variable will give
4415 DECL an rtl we can live with: (mem (const_int 0)). */
4416 type = TREE_TYPE (decl) = error_mark_node;
4419 /* Create a new scope to hold this declaration if necessary.
4420 Whether or not a new scope is necessary cannot be determined
4421 until after the type has been completed; if the type is a
4422 specialization of a class template it is not until after
4423 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4424 will be set correctly. */
4425 maybe_push_cleanup_level (type);
4428 /* Handle initialization of references. DECL, TYPE, and INIT have the
4429 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4430 but will be set to a new CLEANUP_STMT if a temporary is created
4431 that must be destroyed subsequently.
4433 Returns an initializer expression to use to initialize DECL, or
4434 NULL if the initialization can be performed statically.
4436 Quotes on semantics can be found in ARM 8.4.3. */
4439 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4443 if (init == NULL_TREE)
4445 if ((DECL_LANG_SPECIFIC (decl) == 0
4446 || DECL_IN_AGGR_P (decl) == 0)
4447 && ! DECL_THIS_EXTERN (decl))
4448 error ("%qD declared as reference but not initialized", decl);
4452 if (TREE_CODE (init) == TREE_LIST)
4453 init = build_x_compound_expr_from_list (init, "initializer");
4455 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4456 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4457 /* Note: default conversion is only called in very special cases. */
4458 init = decay_conversion (init);
4460 /* Convert INIT to the reference type TYPE. This may involve the
4461 creation of a temporary, whose lifetime must be the same as that
4462 of the reference. If so, a DECL_EXPR for the temporary will be
4463 added just after the DECL_EXPR for DECL. That's why we don't set
4464 DECL_INITIAL for local references (instead assigning to them
4465 explicitly); we need to allow the temporary to be initialized
4467 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4469 if (tmp == error_mark_node)
4471 else if (tmp == NULL_TREE)
4473 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4477 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4480 DECL_INITIAL (decl) = tmp;
4485 /* Subroutine of check_initializer. We're initializing a DECL of
4486 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4487 extend the lifetime of the underlying array to match that of the decl,
4488 just like for reference initialization. CLEANUP is as for
4489 grok_reference_init. */
4492 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4494 tree aggr_init, array, arrtype;
4495 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4496 if (error_operand_p (init))
4497 return error_mark_node;
4499 aggr_init = TARGET_EXPR_INITIAL (init);
4500 init = build2 (INIT_EXPR, type, decl, init);
4502 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4503 arrtype = TREE_TYPE (array);
4505 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4506 array = TREE_OPERAND (array, 0);
4507 /* If the array is constant, finish_compound_literal already made it a
4508 static variable and we don't need to do anything here. */
4509 if (decl && TREE_CODE (array) == TARGET_EXPR)
4512 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4513 var = build_address (var);
4514 var = convert (arrtype, var);
4515 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4516 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4521 /* Designated initializers in arrays are not supported in GNU C++.
4522 The parser cannot detect this error since it does not know whether
4523 a given brace-enclosed initializer is for a class type or for an
4524 array. This function checks that CE does not use a designated
4525 initializer. If it does, an error is issued. Returns true if CE
4526 is valid, i.e., does not have a designated initializer. */
4529 check_array_designated_initializer (const constructor_elt *ce)
4531 /* Designated initializers for array elements are not supported. */
4534 /* The parser only allows identifiers as designated
4536 if (ce->index == error_mark_node)
4537 error ("name used in a GNU-style designated "
4538 "initializer for an array");
4541 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4542 error ("name %qD used in a GNU-style designated "
4543 "initializer for an array", ce->index);
4551 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4552 array until we finish parsing the initializer. If that's the
4553 situation we're in, update DECL accordingly. */
4556 maybe_deduce_size_from_array_init (tree decl, tree init)
4558 tree type = TREE_TYPE (decl);
4560 if (TREE_CODE (type) == ARRAY_TYPE
4561 && TYPE_DOMAIN (type) == NULL_TREE
4562 && TREE_CODE (decl) != TYPE_DECL)
4564 /* do_default is really a C-ism to deal with tentative definitions.
4565 But let's leave it here to ease the eventual merge. */
4566 int do_default = !DECL_EXTERNAL (decl);
4567 tree initializer = init ? init : DECL_INITIAL (decl);
4570 /* Check that there are no designated initializers in INIT, as
4571 those are not supported in GNU C++, and as the middle-end
4572 will crash if presented with a non-numeric designated
4574 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4576 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4577 constructor_elt *ce;
4580 VEC_iterate (constructor_elt, v, i, ce);
4582 if (!check_array_designated_initializer (ce))
4588 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4592 error ("initializer fails to determine size of %qD", decl);
4593 TREE_TYPE (decl) = error_mark_node;
4595 else if (failure == 2)
4599 error ("array size missing in %qD", decl);
4600 TREE_TYPE (decl) = error_mark_node;
4602 /* If a `static' var's size isn't known, make it extern as
4603 well as static, so it does not get allocated. If it's not
4604 `static', then don't mark it extern; finish_incomplete_decl
4605 will give it a default size and it will get allocated. */
4606 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4607 DECL_EXTERNAL (decl) = 1;
4609 else if (failure == 3)
4611 error ("zero-size array %qD", decl);
4612 TREE_TYPE (decl) = error_mark_node;
4616 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4618 relayout_decl (decl);
4622 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4623 any appropriate error messages regarding the layout. */
4626 layout_var_decl (tree decl)
4630 type = TREE_TYPE (decl);
4631 if (type == error_mark_node)
4634 /* If we haven't already layed out this declaration, do so now.
4635 Note that we must not call complete type for an external object
4636 because it's type might involve templates that we are not
4637 supposed to instantiate yet. (And it's perfectly valid to say
4638 `extern X x' for some incomplete type `X'.) */
4639 if (!DECL_EXTERNAL (decl))
4640 complete_type (type);
4641 if (!DECL_SIZE (decl)
4642 && TREE_TYPE (decl) != error_mark_node
4643 && (COMPLETE_TYPE_P (type)
4644 || (TREE_CODE (type) == ARRAY_TYPE
4645 && !TYPE_DOMAIN (type)
4646 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4647 layout_decl (decl, 0);
4649 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4651 /* An automatic variable with an incomplete type: that is an error.
4652 Don't talk about array types here, since we took care of that
4653 message in grokdeclarator. */
4654 error ("storage size of %qD isn't known", decl);
4655 TREE_TYPE (decl) = error_mark_node;
4658 /* Keep this code around in case we later want to control debug info
4659 based on whether a type is "used". (jason 1999-11-11) */
4661 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4662 /* Let debugger know it should output info for this type. */
4663 note_debug_info_needed (ttype);
4665 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4666 note_debug_info_needed (DECL_CONTEXT (decl));
4669 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4670 && DECL_SIZE (decl) != NULL_TREE
4671 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4673 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4674 constant_expression_warning (DECL_SIZE (decl));
4677 error ("storage size of %qD isn't constant", decl);
4678 TREE_TYPE (decl) = error_mark_node;
4683 /* If a local static variable is declared in an inline function, or if
4684 we have a weak definition, we must endeavor to create only one
4685 instance of the variable at link-time. */
4688 maybe_commonize_var (tree decl)
4690 /* Static data in a function with comdat linkage also has comdat
4692 if (TREE_STATIC (decl)
4693 /* Don't mess with __FUNCTION__. */
4694 && ! DECL_ARTIFICIAL (decl)
4695 && DECL_FUNCTION_SCOPE_P (decl)
4696 && vague_linkage_p (DECL_CONTEXT (decl)))
4700 /* With weak symbols, we simply make the variable COMDAT;
4701 that will cause copies in multiple translations units to
4703 comdat_linkage (decl);
4707 if (DECL_INITIAL (decl) == NULL_TREE
4708 || DECL_INITIAL (decl) == error_mark_node)
4710 /* Without weak symbols, we can use COMMON to merge
4711 uninitialized variables. */
4712 TREE_PUBLIC (decl) = 1;
4713 DECL_COMMON (decl) = 1;
4717 /* While for initialized variables, we must use internal
4718 linkage -- which means that multiple copies will not
4720 TREE_PUBLIC (decl) = 0;
4721 DECL_COMMON (decl) = 0;
4722 warning_at (input_location, 0,
4723 "sorry: semantics of inline function static "
4724 "data %q+#D are wrong (you'll wind up "
4725 "with multiple copies)", decl);
4726 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4727 " you can work around this by removing "
4732 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4733 /* Set it up again; we might have set DECL_INITIAL since the last
4735 comdat_linkage (decl);
4738 /* Issue an error message if DECL is an uninitialized const variable. */
4741 check_for_uninitialized_const_var (tree decl)
4743 tree type = strip_array_types (TREE_TYPE (decl));
4745 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
4746 && DECL_INITIAL (decl) == NULL)
4747 error ("missing initializer for constexpr %qD", decl);
4749 /* ``Unless explicitly declared extern, a const object does not have
4750 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4752 else if (TREE_CODE (decl) == VAR_DECL
4753 && TREE_CODE (type) != REFERENCE_TYPE
4754 && CP_TYPE_CONST_P (type)
4755 && (!TYPE_NEEDS_CONSTRUCTING (type)
4756 || !type_has_user_provided_default_constructor (type))
4757 && !DECL_INITIAL (decl))
4759 permerror (DECL_SOURCE_LOCATION (decl),
4760 "uninitialized const %qD", decl);
4762 if (CLASS_TYPE_P (type)
4763 && !type_has_user_provided_default_constructor (type))
4765 tree defaulted_ctor;
4767 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4768 "%q#T has no user-provided default constructor", type);
4769 defaulted_ctor = in_class_defaulted_default_constructor (type);
4771 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4772 "constructor is not user-provided because it is "
4773 "explicitly defaulted in the class body");
4778 /* Structure holding the current initializer being processed by reshape_init.
4779 CUR is a pointer to the current element being processed, END is a pointer
4780 after the last element present in the initializer. */
4781 typedef struct reshape_iterator_t
4783 constructor_elt *cur;
4784 constructor_elt *end;
4787 static tree reshape_init_r (tree, reshape_iter *, bool);
4789 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4790 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4791 initialized. If there are no more such fields, the return value
4795 next_initializable_field (tree field)
4798 && (TREE_CODE (field) != FIELD_DECL
4799 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4800 || DECL_ARTIFICIAL (field)))
4801 field = TREE_CHAIN (field);
4806 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4807 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4808 INTEGER_CST representing the size of the array minus one (the maximum index),
4809 or NULL_TREE if the array was declared without specifying the size. D is
4810 the iterator within the constructor. */
4813 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4816 bool sized_array_p = (max_index != NULL_TREE);
4817 unsigned HOST_WIDE_INT max_index_cst = 0;
4818 unsigned HOST_WIDE_INT index;
4820 /* The initializer for an array is always a CONSTRUCTOR. */
4821 new_init = build_constructor (init_list_type_node, NULL);
4825 /* Minus 1 is used for zero sized arrays. */
4826 if (integer_all_onesp (max_index))
4829 if (host_integerp (max_index, 1))
4830 max_index_cst = tree_low_cst (max_index, 1);
4831 /* sizetype is sign extended, not zero extended. */
4833 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4837 /* Loop until there are no more initializers. */
4839 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4844 check_array_designated_initializer (d->cur);
4845 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4846 if (elt_init == error_mark_node)
4847 return error_mark_node;
4848 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4854 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4855 Parameters are the same of reshape_init_r. */
4858 reshape_init_array (tree type, reshape_iter *d)
4860 tree max_index = NULL_TREE;
4862 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4864 if (TYPE_DOMAIN (type))
4865 max_index = array_type_nelts (type);
4867 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4870 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4871 Parameters are the same of reshape_init_r. */
4874 reshape_init_vector (tree type, reshape_iter *d)
4876 tree max_index = NULL_TREE;
4879 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4881 if (COMPOUND_LITERAL_P (d->cur->value))
4883 tree value = d->cur->value;
4884 if (!same_type_p (TREE_TYPE (value), type))
4886 error ("invalid type %qT as initializer for a vector of type %qT",
4887 TREE_TYPE (d->cur->value), type);
4888 value = error_mark_node;
4894 /* For a vector, the representation type is a struct
4895 containing a single member which is an array of the
4896 appropriate size. */
4897 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4898 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4899 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4901 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4904 /* Subroutine of reshape_init_r, processes the initializers for classes
4905 or union. Parameters are the same of reshape_init_r. */
4908 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4913 gcc_assert (CLASS_TYPE_P (type));
4915 /* The initializer for a class is always a CONSTRUCTOR. */
4916 new_init = build_constructor (init_list_type_node, NULL);
4917 field = next_initializable_field (TYPE_FIELDS (type));
4923 An initializer for an aggregate member that is an
4924 empty class shall have the form of an empty
4925 initializer-list {}. */
4926 if (!first_initializer_p)
4928 error ("initializer for %qT must be brace-enclosed", type);
4929 return error_mark_node;
4934 /* Loop through the initializable fields, gathering initializers. */
4935 while (d->cur != d->end)
4939 /* Handle designated initializers, as an extension. */
4942 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4944 if (!field || TREE_CODE (field) != FIELD_DECL)
4946 error ("%qT has no non-static data member named %qD", type,
4948 return error_mark_node;
4952 /* If we processed all the member of the class, we are done. */
4956 field_init = reshape_init_r (TREE_TYPE (field), d,
4957 /*first_initializer_p=*/false);
4958 if (field_init == error_mark_node)
4959 return error_mark_node;
4961 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4965 When a union is initialized with a brace-enclosed
4966 initializer, the braces shall only contain an
4967 initializer for the first member of the union. */
4968 if (TREE_CODE (type) == UNION_TYPE)
4971 field = next_initializable_field (TREE_CHAIN (field));
4977 /* Subroutine of reshape_init, which processes a single initializer (part of
4978 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4979 iterator within the CONSTRUCTOR which points to the initializer to process.
4980 FIRST_INITIALIZER_P is true if this is the first initializer of the
4981 outermost CONSTRUCTOR node. */
4984 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4986 tree init = d->cur->value;
4988 if (error_operand_p (init))
4989 return error_mark_node;
4991 /* A non-aggregate type is always initialized with a single
4993 if (!CP_AGGREGATE_TYPE_P (type))
4995 /* It is invalid to initialize a non-aggregate type with a
4996 brace-enclosed initializer before C++0x.
4997 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4998 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4999 a CONSTRUCTOR (with a record type). */
5000 if (TREE_CODE (init) == CONSTRUCTOR
5001 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5003 if (SCALAR_TYPE_P (type))
5005 error ("braces around scalar initializer for type %qT", type);
5006 init = error_mark_node;
5009 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5018 All implicit type conversions (clause _conv_) are considered when
5019 initializing the aggregate member with an initializer from an
5020 initializer-list. If the initializer can initialize a member,
5021 the member is initialized. Otherwise, if the member is itself a
5022 non-empty subaggregate, brace elision is assumed and the
5023 initializer is considered for the initialization of the first
5024 member of the subaggregate. */
5025 if (TREE_CODE (init) != CONSTRUCTOR
5026 /* But don't try this for the first initializer, since that would be
5027 looking through the outermost braces; A a2 = { a1 }; is not a
5028 valid aggregate initialization. */
5029 && !first_initializer_p
5030 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5031 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5037 /* [dcl.init.string]
5039 A char array (whether plain char, signed char, or unsigned char)
5040 can be initialized by a string-literal (optionally enclosed in
5041 braces); a wchar_t array can be initialized by a wide
5042 string-literal (optionally enclosed in braces). */
5043 if (TREE_CODE (type) == ARRAY_TYPE
5044 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5046 tree str_init = init;
5048 /* Strip one level of braces if and only if they enclose a single
5049 element (as allowed by [dcl.init.string]). */
5050 if (!first_initializer_p
5051 && TREE_CODE (str_init) == CONSTRUCTOR
5052 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5054 str_init = VEC_index (constructor_elt,
5055 CONSTRUCTOR_ELTS (str_init), 0)->value;
5058 /* If it's a string literal, then it's the initializer for the array
5059 as a whole. Otherwise, continue with normal initialization for
5060 array types (one value per array element). */
5061 if (TREE_CODE (str_init) == STRING_CST)
5068 /* The following cases are about aggregates. If we are not within a full
5069 initializer already, and there is not a CONSTRUCTOR, it means that there
5070 is a missing set of braces (that is, we are processing the case for
5071 which reshape_init exists). */
5072 if (!first_initializer_p)
5074 if (TREE_CODE (init) == CONSTRUCTOR)
5076 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5077 /* There is no need to reshape pointer-to-member function
5078 initializers, as they are always constructed correctly
5079 by the front end. */
5081 else if (COMPOUND_LITERAL_P (init))
5082 /* For a nested compound literal, there is no need to reshape since
5083 brace elision is not allowed. Even if we decided to allow it,
5084 we should add a call to reshape_init in finish_compound_literal,
5085 before calling digest_init, so changing this code would still
5086 not be necessary. */
5087 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5091 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5092 return reshape_init (type, init);
5096 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5100 /* Dispatch to specialized routines. */
5101 if (CLASS_TYPE_P (type))
5102 return reshape_init_class (type, d, first_initializer_p);
5103 else if (TREE_CODE (type) == ARRAY_TYPE)
5104 return reshape_init_array (type, d);
5105 else if (TREE_CODE (type) == VECTOR_TYPE)
5106 return reshape_init_vector (type, d);
5111 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5112 brace-enclosed aggregate initializer.
5114 INIT is the CONSTRUCTOR containing the list of initializers describing
5115 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5116 It may not presently match the shape of the TYPE; for example:
5118 struct S { int a; int b; };
5119 struct S a[] = { 1, 2, 3, 4 };
5121 Here INIT will hold a VEC of four elements, rather than a
5122 VEC of two elements, each itself a VEC of two elements. This
5123 routine transforms INIT from the former form into the latter. The
5124 revised CONSTRUCTOR node is returned. */
5127 reshape_init (tree type, tree init)
5129 VEC(constructor_elt, gc) *v;
5133 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5135 v = CONSTRUCTOR_ELTS (init);
5137 /* An empty constructor does not need reshaping, and it is always a valid
5139 if (VEC_empty (constructor_elt, v))
5142 /* Recurse on this CONSTRUCTOR. */
5143 d.cur = VEC_index (constructor_elt, v, 0);
5144 d.end = d.cur + VEC_length (constructor_elt, v);
5146 new_init = reshape_init_r (type, &d, true);
5147 if (new_init == error_mark_node)
5148 return error_mark_node;
5150 /* Make sure all the element of the constructor were used. Otherwise,
5151 issue an error about exceeding initializers. */
5153 error ("too many initializers for %qT", type);
5158 /* Verify array initializer. Returns true if errors have been reported. */
5161 check_array_initializer (tree decl, tree type, tree init)
5163 tree element_type = TREE_TYPE (type);
5165 /* The array type itself need not be complete, because the
5166 initializer may tell us how many elements are in the array.
5167 But, the elements of the array must be complete. */
5168 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5171 error ("elements of array %q#D have incomplete type", decl);
5173 error ("elements of array %q#T have incomplete type", type);
5176 /* It is not valid to initialize a VLA. */
5178 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5179 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5182 error ("variable-sized object %qD may not be initialized", decl);
5184 error ("variable-sized compound literal");
5190 /* Subroutine of check_initializer; args are passed down from that function.
5191 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5194 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5197 int saved_stmts_are_full_exprs_p = 0;
5198 if (building_stmt_tree ())
5200 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5201 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5203 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5204 if (building_stmt_tree ())
5205 current_stmt_tree ()->stmts_are_full_exprs_p =
5206 saved_stmts_are_full_exprs_p;
5210 /* Verify INIT (the initializer for DECL), and record the
5211 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5212 grok_reference_init.
5214 If the return value is non-NULL, it is an expression that must be
5215 evaluated dynamically to initialize DECL. */
5218 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5220 tree type = TREE_TYPE (decl);
5221 tree init_code = NULL;
5224 /* Things that are going to be initialized need to have complete
5226 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5228 if (type == error_mark_node)
5229 /* We will have already complained. */
5232 if (TREE_CODE (type) == ARRAY_TYPE)
5234 if (check_array_initializer (decl, type, init))
5237 else if (!COMPLETE_TYPE_P (type))
5239 error ("%qD has incomplete type", decl);
5240 TREE_TYPE (decl) = error_mark_node;
5244 /* There is no way to make a variable-sized class type in GNU C++. */
5245 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5247 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5249 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5250 if (SCALAR_TYPE_P (type))
5254 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5255 init = build_zero_init (type, NULL_TREE, false);
5257 else if (init_len != 1)
5259 error ("scalar object %qD requires one element in initializer",
5261 TREE_TYPE (decl) = error_mark_node;
5267 if (TREE_CODE (decl) == CONST_DECL)
5269 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5271 DECL_INITIAL (decl) = init;
5273 gcc_assert (init != NULL_TREE);
5276 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5277 init = grok_reference_init (decl, type, init, cleanup);
5280 /* Do not reshape constructors of vectors (they don't need to be
5282 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5284 if (is_std_init_list (type))
5285 return build_init_list_var_init (decl, type, init, cleanup);
5286 else if (TYPE_NON_AGGREGATE_CLASS (type))
5288 /* Don't reshape if the class has constructors. */
5289 if (cxx_dialect == cxx98)
5290 error ("in C++98 %qD must be initialized by constructor, "
5294 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5296 error ("opaque vector types cannot be initialized");
5297 init = error_mark_node;
5300 init = reshape_init (type, init);
5303 /* If DECL has an array type without a specific bound, deduce the
5304 array size from the initializer. */
5305 maybe_deduce_size_from_array_init (decl, init);
5306 type = TREE_TYPE (decl);
5307 if (type == error_mark_node)
5310 if (TYPE_NEEDS_CONSTRUCTING (type)
5311 || (CLASS_TYPE_P (type)
5312 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5313 return build_aggr_init_full_exprs (decl, init, flags);
5314 else if (TREE_CODE (init) != TREE_VEC)
5316 init_code = store_init_value (decl, init, flags);
5317 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5318 && DECL_INITIAL (decl)
5319 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5320 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5321 warning (0, "array %qD initialized by parenthesized string literal %qE",
5322 decl, DECL_INITIAL (decl));
5326 else if (DECL_EXTERNAL (decl))
5328 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5330 check_for_uninitialized_const_var (decl);
5331 return build_aggr_init_full_exprs (decl, init, flags);
5333 else if (MAYBE_CLASS_TYPE_P (core_type = strip_array_types (type)))
5335 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5336 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5337 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5340 check_for_uninitialized_const_var (decl);
5343 check_for_uninitialized_const_var (decl);
5345 if (init && init != error_mark_node)
5346 init_code = build2 (INIT_EXPR, type, decl, init);
5351 /* If DECL is not a local variable, give it RTL. */
5354 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5356 int toplev = toplevel_bindings_p ();
5358 const char *filename;
5360 /* Set the DECL_ASSEMBLER_NAME for the object. */
5363 /* The `register' keyword, when used together with an
5364 asm-specification, indicates that the variable should be
5365 placed in a particular register. */
5366 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5368 set_user_assembler_name (decl, asmspec);
5369 DECL_HARD_REGISTER (decl) = 1;
5373 if (TREE_CODE (decl) == FUNCTION_DECL
5374 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5375 set_builtin_user_assembler_name (decl, asmspec);
5376 set_user_assembler_name (decl, asmspec);
5380 /* Handle non-variables up front. */
5381 if (TREE_CODE (decl) != VAR_DECL)
5383 rest_of_decl_compilation (decl, toplev, at_eof);
5387 /* If we see a class member here, it should be a static data
5389 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5391 gcc_assert (TREE_STATIC (decl));
5392 /* An in-class declaration of a static data member should be
5393 external; it is only a declaration, and not a definition. */
5394 if (init == NULL_TREE)
5395 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5398 /* We don't create any RTL for local variables. */
5399 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5402 /* We defer emission of local statics until the corresponding
5403 DECL_EXPR is expanded. */
5404 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5406 /* We try to defer namespace-scope static constants so that they are
5407 not emitted into the object file unnecessarily. */
5408 filename = input_filename;
5409 if (!DECL_VIRTUAL_P (decl)
5410 && TREE_READONLY (decl)
5411 && DECL_INITIAL (decl) != NULL_TREE
5412 && DECL_INITIAL (decl) != error_mark_node
5414 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5416 && !TREE_PUBLIC (decl))
5418 /* Fool with the linkage of static consts according to #pragma
5420 struct c_fileinfo *finfo = get_fileinfo (filename);
5421 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5423 TREE_PUBLIC (decl) = 1;
5424 DECL_EXTERNAL (decl) = finfo->interface_only;
5429 /* Likewise for template instantiations. */
5430 else if (DECL_LANG_SPECIFIC (decl)
5431 && DECL_IMPLICIT_INSTANTIATION (decl))
5434 /* If we're not deferring, go ahead and assemble the variable. */
5436 rest_of_decl_compilation (decl, toplev, at_eof);
5439 /* walk_tree helper for wrap_temporary_cleanups, below. */
5442 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5444 if (TYPE_P (*stmt_p))
5450 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5452 tree guard = (tree)data;
5453 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5455 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5456 /* Tell honor_protect_cleanup_actions to handle this as a separate
5458 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5460 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5466 /* We're initializing a local variable which has a cleanup GUARD. If there
5467 are any temporaries used in the initializer INIT of this variable, we
5468 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5469 variable will be cleaned up properly if one of them throws.
5471 Unfortunately, there's no way to express this properly in terms of
5472 nesting, as the regions for the temporaries overlap the region for the
5473 variable itself; if there are two temporaries, the variable needs to be
5474 the first thing destroyed if either of them throws. However, we only
5475 want to run the variable's cleanup if it actually got constructed. So
5476 we need to guard the temporary cleanups with the variable's cleanup if
5477 they are run on the normal path, but not if they are run on the
5478 exceptional path. We implement this by telling
5479 honor_protect_cleanup_actions to strip the variable cleanup from the
5480 exceptional path. */
5483 wrap_temporary_cleanups (tree init, tree guard)
5485 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5488 /* Generate code to initialize DECL (a local variable). */
5491 initialize_local_var (tree decl, tree init)
5493 tree type = TREE_TYPE (decl);
5497 gcc_assert (TREE_CODE (decl) == VAR_DECL
5498 || TREE_CODE (decl) == RESULT_DECL);
5499 gcc_assert (!TREE_STATIC (decl));
5501 if (DECL_SIZE (decl) == NULL_TREE)
5503 /* If we used it already as memory, it must stay in memory. */
5504 DECL_INITIAL (decl) = NULL_TREE;
5505 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5509 if (type == error_mark_node)
5512 /* Compute and store the initial value. */
5513 already_used = TREE_USED (decl) || TREE_USED (type);
5514 if (TREE_USED (type))
5515 DECL_READ_P (decl) = 1;
5517 /* Generate a cleanup, if necessary. */
5518 cleanup = cxx_maybe_build_cleanup (decl);
5520 /* Perform the initialization. */
5523 int saved_stmts_are_full_exprs_p;
5525 /* If we're only initializing a single object, guard the destructors
5526 of any temporaries used in its initializer with its destructor.
5527 This isn't right for arrays because each element initialization is
5528 a full-expression. */
5529 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5530 wrap_temporary_cleanups (init, cleanup);
5532 gcc_assert (building_stmt_tree ());
5533 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5534 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5535 finish_expr_stmt (init);
5536 current_stmt_tree ()->stmts_are_full_exprs_p =
5537 saved_stmts_are_full_exprs_p;
5540 /* Set this to 0 so we can tell whether an aggregate which was
5541 initialized was ever used. Don't do this if it has a
5542 destructor, so we don't complain about the 'resource
5543 allocation is initialization' idiom. Now set
5544 attribute((unused)) on types so decls of that type will be
5545 marked used. (see TREE_USED, above.) */
5546 if (TYPE_NEEDS_CONSTRUCTING (type)
5548 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5549 && DECL_NAME (decl))
5550 TREE_USED (decl) = 0;
5551 else if (already_used)
5552 TREE_USED (decl) = 1;
5555 finish_decl_cleanup (decl, cleanup);
5558 /* DECL is a VAR_DECL for a compiler-generated variable with static
5559 storage duration (like a virtual table) whose initializer is a
5560 compile-time constant. Initialize the variable and provide it to the
5564 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5567 gcc_assert (DECL_ARTIFICIAL (decl));
5568 init = build_constructor (TREE_TYPE (decl), v);
5569 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5570 DECL_INITIAL (decl) = init;
5571 DECL_INITIALIZED_P (decl) = 1;
5572 determine_visibility (decl);
5573 layout_var_decl (decl);
5574 maybe_commonize_var (decl);
5575 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5578 /* INIT is the initializer for a variable, as represented by the
5579 parser. Returns true iff INIT is value-dependent. */
5582 value_dependent_init_p (tree init)
5584 if (TREE_CODE (init) == TREE_LIST)
5585 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5586 return any_value_dependent_elements_p (init);
5587 else if (TREE_CODE (init) == CONSTRUCTOR)
5588 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5590 VEC(constructor_elt, gc) *elts;
5594 elts = CONSTRUCTOR_ELTS (init);
5595 nelts = VEC_length (constructor_elt, elts);
5596 for (i = 0; i < nelts; ++i)
5597 if (value_dependent_init_p (VEC_index (constructor_elt,
5602 /* It must be a simple expression, e.g., int i = 3; */
5603 return value_dependent_expression_p (init);
5608 /* Finish processing of a declaration;
5609 install its line number and initial value.
5610 If the length of an array type is not known before,
5611 it must be determined now, from the initial value, or it is an error.
5613 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5614 true, then INIT is an integral constant expression.
5616 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5617 if the (init) syntax was used. */
5620 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5621 tree asmspec_tree, int flags)
5625 const char *asmspec = NULL;
5626 int was_readonly = 0;
5627 bool var_definition_p = false;
5628 int saved_processing_template_decl;
5631 if (decl == error_mark_node)
5636 error ("assignment (not initialization) in declaration");
5640 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5641 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5642 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5644 type = TREE_TYPE (decl);
5645 if (type == error_mark_node)
5648 /* Assume no cleanup is required. */
5649 cleanup = NULL_TREE;
5650 saved_processing_template_decl = processing_template_decl;
5652 /* If a name was specified, get the string. */
5653 if (global_scope_p (current_binding_level))
5654 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5655 if (asmspec_tree && asmspec_tree != error_mark_node)
5656 asmspec = TREE_STRING_POINTER (asmspec_tree);
5658 if (current_class_type
5659 && CP_DECL_CONTEXT (decl) == current_class_type
5660 && TYPE_BEING_DEFINED (current_class_type)
5661 && (DECL_INITIAL (decl) || init))
5662 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5664 auto_node = type_uses_auto (type);
5667 if (init == NULL_TREE)
5669 error ("declaration of %q#D has no initializer", decl);
5670 TREE_TYPE (decl) = error_mark_node;
5673 if (TREE_CODE (init) == TREE_LIST)
5674 init = build_x_compound_expr_from_list (init, "initializer");
5675 if (describable_type (init))
5677 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5678 if (type == error_mark_node)
5683 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5686 if (init == ridpointers[(int)RID_DELETE])
5688 /* FIXME check this is 1st decl. */
5689 DECL_DELETED_FN (decl) = 1;
5690 DECL_DECLARED_INLINE_P (decl) = 1;
5691 DECL_INITIAL (decl) = error_mark_node;
5692 FOR_EACH_CLONE (clone, decl)
5694 DECL_DELETED_FN (clone) = 1;
5695 DECL_DECLARED_INLINE_P (clone) = 1;
5696 DECL_INITIAL (clone) = error_mark_node;
5700 else if (init == ridpointers[(int)RID_DEFAULT])
5702 if (defaultable_fn_check (decl))
5703 DECL_DEFAULTED_FN (decl) = 1;
5705 DECL_INITIAL (decl) = NULL_TREE;
5709 if (processing_template_decl)
5711 bool type_dependent_p;
5713 /* Add this declaration to the statement-tree. */
5714 if (at_function_scope_p ())
5715 add_decl_expr (decl);
5717 type_dependent_p = dependent_type_p (type);
5719 if (check_for_bare_parameter_packs (init))
5722 DECL_INITIAL (decl) = NULL_TREE;
5725 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5727 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5728 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5729 TREE_CONSTANT (decl) = 1;
5732 /* Generally, initializers in templates are expanded when the
5733 template is instantiated. But, if DECL is an integral
5734 constant static data member, then it can be used in future
5735 integral constant expressions, and its value must be
5738 && DECL_CLASS_SCOPE_P (decl)
5739 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5740 && !type_dependent_p
5741 && !value_dependent_init_p (init)))
5744 DECL_INITIAL (decl) = init;
5745 if (TREE_CODE (decl) == VAR_DECL
5746 && !DECL_PRETTY_FUNCTION_P (decl)
5747 && !type_dependent_p)
5748 maybe_deduce_size_from_array_init (decl, init);
5752 if (TREE_CODE (init) == TREE_LIST)
5754 /* If the parenthesized-initializer form was used (e.g.,
5755 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5756 arguments. (There is generally only one.) We convert them
5759 for (; list; list = TREE_CHAIN (list))
5761 tree elt = TREE_VALUE (list);
5762 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5766 init = fold_non_dependent_expr (init);
5767 processing_template_decl = 0;
5770 /* Take care of TYPE_DECLs up front. */
5771 if (TREE_CODE (decl) == TYPE_DECL)
5773 if (type != error_mark_node
5774 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5776 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5777 warning (0, "shadowing previous type declaration of %q#D", decl);
5778 set_identifier_type_value (DECL_NAME (decl), decl);
5781 /* If we have installed this as the canonical typedef for this
5782 type, and that type has not been defined yet, delay emitting
5783 the debug information for it, as we will emit it later. */
5784 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5785 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5786 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5788 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5793 /* A reference will be modified here, as it is initialized. */
5794 if (! DECL_EXTERNAL (decl)
5795 && TREE_READONLY (decl)
5796 && TREE_CODE (type) == REFERENCE_TYPE)
5799 TREE_READONLY (decl) = 0;
5802 if (TREE_CODE (decl) == VAR_DECL)
5804 /* Only variables with trivial initialization and destruction can
5805 have thread-local storage. */
5806 if (DECL_THREAD_LOCAL_P (decl)
5807 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5808 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5809 error ("%qD cannot be thread-local because it has non-trivial "
5810 "type %qT", decl, TREE_TYPE (decl));
5811 /* If this is a local variable that will need a mangled name,
5812 register it now. We must do this before processing the
5813 initializer for the variable, since the initialization might
5814 require a guard variable, and since the mangled name of the
5815 guard variable will depend on the mangled name of this
5817 if (DECL_FUNCTION_SCOPE_P (decl)
5818 && TREE_STATIC (decl)
5819 && !DECL_ARTIFICIAL (decl))
5821 push_local_name (decl);
5822 if (DECL_CONSTRUCTOR_P (current_function_decl)
5823 || DECL_DESTRUCTOR_P (current_function_decl))
5824 /* Normally local_decls is populated during GIMPLE lowering,
5825 but [cd]tors are never actually compiled directly. We need
5826 to put statics on the list so we can deal with the label
5827 address extension. */
5828 cfun->local_decls = tree_cons (NULL_TREE, decl,
5832 /* Convert the initializer to the type of DECL, if we have not
5833 already initialized DECL. */
5834 if (!DECL_INITIALIZED_P (decl)
5835 /* If !DECL_EXTERNAL then DECL is being defined. In the
5836 case of a static data member initialized inside the
5837 class-specifier, there can be an initializer even if DECL
5838 is *not* defined. */
5839 && (!DECL_EXTERNAL (decl) || init))
5841 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5844 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5845 /* Allow libjava/prims.cc define primitive classes. */
5846 if (init != NULL_TREE
5847 || jclass == NULL_TREE
5848 || TREE_CODE (jclass) != TYPE_DECL
5849 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5850 || !same_type_ignoring_top_level_qualifiers_p
5851 (type, TREE_TYPE (TREE_TYPE (jclass))))
5852 error ("Java object %qD not allocated with %<new%>", decl);
5857 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5858 if (init_const_expr_p)
5860 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5861 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5862 TREE_CONSTANT (decl) = 1;
5865 init = check_initializer (decl, init, flags, &cleanup);
5866 /* Thread-local storage cannot be dynamically initialized. */
5867 if (DECL_THREAD_LOCAL_P (decl) && init)
5869 error ("%qD is thread-local and so cannot be dynamically "
5870 "initialized", decl);
5874 /* Check that the initializer for a static data member was a
5875 constant. Although we check in the parser that the
5876 initializer is an integral constant expression, we do not
5877 simplify division-by-zero at the point at which it
5878 occurs. Therefore, in:
5880 struct S { static const int i = 7 / 0; };
5882 we issue an error at this point. It would
5883 probably be better to forbid division by zero in
5884 integral constant expressions. */
5885 if (DECL_EXTERNAL (decl) && init)
5887 error ("%qD cannot be initialized by a non-constant expression"
5888 " when being declared", decl);
5889 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5897 The memory occupied by any object of static storage
5898 duration is zero-initialized at program startup before
5899 any other initialization takes place.
5901 We cannot create an appropriate initializer until after
5902 the type of DECL is finalized. If DECL_INITIAL is set,
5903 then the DECL is statically initialized, and any
5904 necessary zero-initialization has already been performed. */
5905 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5906 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5907 /*nelts=*/NULL_TREE,
5908 /*static_storage_p=*/true);
5909 /* Remember that the initialization for this variable has
5911 DECL_INITIALIZED_P (decl) = 1;
5912 /* This declaration is the definition of this variable,
5913 unless we are initializing a static data member within
5914 the class specifier. */
5915 if (!DECL_EXTERNAL (decl))
5916 var_definition_p = true;
5918 /* If the variable has an array type, lay out the type, even if
5919 there is no initializer. It is valid to index through the
5920 array, and we must get TYPE_ALIGN set correctly on the array
5922 else if (TREE_CODE (type) == ARRAY_TYPE)
5925 if (!processing_template_decl
5926 && TREE_STATIC (decl)
5927 && !at_function_scope_p ()
5928 && current_function_decl == NULL)
5929 /* So decl is a global variable or a static member of a
5930 non local class. Record the types it uses
5931 so that we can decide later to emit debug info for them. */
5932 record_types_used_by_current_var_decl (decl);
5934 else if (TREE_CODE (decl) == FIELD_DECL
5935 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5936 error ("non-static data member %qD has Java class type", decl);
5938 /* Add this declaration to the statement-tree. This needs to happen
5939 after the call to check_initializer so that the DECL_EXPR for a
5940 reference temp is added before the DECL_EXPR for the reference itself. */
5941 if (at_function_scope_p ())
5942 add_decl_expr (decl);
5944 /* Let the middle end know about variables and functions -- but not
5945 static data members in uninstantiated class templates. */
5946 if (!saved_processing_template_decl
5947 && (TREE_CODE (decl) == VAR_DECL
5948 || TREE_CODE (decl) == FUNCTION_DECL))
5950 if (TREE_CODE (decl) == VAR_DECL)
5952 layout_var_decl (decl);
5953 maybe_commonize_var (decl);
5956 /* This needs to happen after the linkage is set. */
5957 determine_visibility (decl);
5959 if (var_definition_p && TREE_STATIC (decl))
5961 /* If a TREE_READONLY variable needs initialization
5962 at runtime, it is no longer readonly and we need to
5963 avoid MEM_READONLY_P being set on RTL created for it. */
5966 if (TREE_READONLY (decl))
5967 TREE_READONLY (decl) = 0;
5970 else if (was_readonly)
5971 TREE_READONLY (decl) = 1;
5974 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5976 /* Check for abstractness of the type. Notice that there is no
5977 need to strip array types here since the check for those types
5978 is already done within create_array_type_for_decl. */
5979 if (TREE_CODE (type) == FUNCTION_TYPE
5980 || TREE_CODE (type) == METHOD_TYPE)
5981 abstract_virtuals_error (decl, TREE_TYPE (type));
5983 abstract_virtuals_error (decl, type);
5985 if (TREE_TYPE (decl) == error_mark_node)
5986 /* No initialization required. */
5988 else if (TREE_CODE (decl) == FUNCTION_DECL)
5992 if (init == ridpointers[(int)RID_DEFAULT])
5994 /* An out-of-class default definition is defined at
5995 the point where it is explicitly defaulted. */
5996 if (DECL_INITIAL (decl) == error_mark_node)
5997 synthesize_method (decl);
6000 error ("function %q#D is initialized like a variable", decl);
6002 /* else no initialization required. */
6004 else if (DECL_EXTERNAL (decl)
6005 && ! (DECL_LANG_SPECIFIC (decl)
6006 && DECL_NOT_REALLY_EXTERN (decl)))
6009 DECL_INITIAL (decl) = init;
6011 /* A variable definition. */
6012 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6013 /* Initialize the local variable. */
6014 initialize_local_var (decl, init);
6016 /* If a variable is defined, and then a subsequent
6017 definition with external linkage is encountered, we will
6018 get here twice for the same variable. We want to avoid
6019 calling expand_static_init more than once. For variables
6020 that are not static data members, we can call
6021 expand_static_init only when we actually process the
6022 initializer. It is not legal to redeclare a static data
6023 member, so this issue does not arise in that case. */
6024 else if (var_definition_p && TREE_STATIC (decl))
6025 expand_static_init (decl, init);
6028 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6029 reference, insert it in the statement-tree now. */
6031 push_cleanup (decl, cleanup, false);
6034 processing_template_decl = saved_processing_template_decl;
6037 TREE_READONLY (decl) = 1;
6040 /* Returns a declaration for a VAR_DECL as if:
6042 extern "C" TYPE NAME;
6044 had been seen. Used to create compiler-generated global
6048 declare_global_var (tree name, tree type)
6052 push_to_top_level ();
6053 decl = build_decl (input_location, VAR_DECL, name, type);
6054 TREE_PUBLIC (decl) = 1;
6055 DECL_EXTERNAL (decl) = 1;
6056 DECL_ARTIFICIAL (decl) = 1;
6057 /* If the user has explicitly declared this variable (perhaps
6058 because the code we are compiling is part of a low-level runtime
6059 library), then it is possible that our declaration will be merged
6060 with theirs by pushdecl. */
6061 decl = pushdecl (decl);
6062 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6063 pop_from_top_level ();
6068 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6069 if "__cxa_atexit" is not being used) corresponding to the function
6070 to be called when the program exits. */
6073 get_atexit_fn_ptr_type (void)
6077 if (!atexit_fn_ptr_type_node)
6080 if (flag_use_cxa_atexit
6081 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6082 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6083 arg_type = ptr_type_node;
6085 /* The parameter to "atexit" is "void (*)(void)". */
6086 arg_type = NULL_TREE;
6088 fn_type = build_function_type_list (void_type_node,
6089 arg_type, NULL_TREE);
6090 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6093 return atexit_fn_ptr_type_node;
6096 /* Returns a pointer to the `atexit' function. Note that if
6097 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6098 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6101 get_atexit_node (void)
6107 bool use_aeabi_atexit;
6112 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6114 /* The declaration for `__cxa_atexit' is:
6116 int __cxa_atexit (void (*)(void *), void *, void *)
6118 We build up the argument types and then then function type
6120 tree argtype0, argtype1, argtype2;
6122 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6123 /* First, build the pointer-to-function type for the first
6125 fn_ptr_type = get_atexit_fn_ptr_type ();
6126 /* Then, build the rest of the argument types. */
6127 argtype2 = ptr_type_node;
6128 if (use_aeabi_atexit)
6130 argtype1 = fn_ptr_type;
6131 argtype0 = ptr_type_node;
6135 argtype1 = ptr_type_node;
6136 argtype0 = fn_ptr_type;
6138 /* And the final __cxa_atexit type. */
6139 fn_type = build_function_type_list (integer_type_node,
6140 argtype0, argtype1, argtype2,
6142 fn_ptr_type = build_pointer_type (fn_type);
6143 if (use_aeabi_atexit)
6144 name = "__aeabi_atexit";
6146 name = "__cxa_atexit";
6150 /* The declaration for `atexit' is:
6152 int atexit (void (*)());
6154 We build up the argument types and then then function type
6156 fn_ptr_type = get_atexit_fn_ptr_type ();
6157 /* Build the final atexit type. */
6158 fn_type = build_function_type_list (integer_type_node,
6159 fn_ptr_type, NULL_TREE);
6163 /* Now, build the function declaration. */
6164 push_lang_context (lang_name_c);
6165 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6166 mark_used (atexit_fndecl);
6167 pop_lang_context ();
6168 atexit_node = decay_conversion (atexit_fndecl);
6173 /* Returns the __dso_handle VAR_DECL. */
6176 get_dso_handle_node (void)
6178 if (dso_handle_node)
6179 return dso_handle_node;
6181 /* Declare the variable. */
6182 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6185 return dso_handle_node;
6188 /* Begin a new function with internal linkage whose job will be simply
6189 to destroy some particular variable. */
6191 static GTY(()) int start_cleanup_cnt;
6194 start_cleanup_fn (void)
6199 bool use_cxa_atexit = flag_use_cxa_atexit
6200 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6202 push_to_top_level ();
6204 /* No need to mangle this. */
6205 push_lang_context (lang_name_c);
6207 /* Build the name of the function. */
6208 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6209 /* Build the function declaration. */
6210 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6211 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6212 /* It's a function with internal linkage, generated by the
6214 TREE_PUBLIC (fndecl) = 0;
6215 DECL_ARTIFICIAL (fndecl) = 1;
6216 /* Make the function `inline' so that it is only emitted if it is
6217 actually needed. It is unlikely that it will be inlined, since
6218 it is only called via a function pointer, but we avoid unnecessary
6219 emissions this way. */
6220 DECL_DECLARED_INLINE_P (fndecl) = 1;
6221 DECL_INTERFACE_KNOWN (fndecl) = 1;
6222 /* Build the parameter. */
6227 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6228 DECL_CONTEXT (parmdecl) = fndecl;
6229 TREE_USED (parmdecl) = 1;
6230 DECL_READ_P (parmdecl) = 1;
6231 DECL_ARGUMENTS (fndecl) = parmdecl;
6235 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6237 pop_lang_context ();
6239 return current_function_decl;
6242 /* Finish the cleanup function begun by start_cleanup_fn. */
6245 end_cleanup_fn (void)
6247 expand_or_defer_fn (finish_function (0));
6249 pop_from_top_level ();
6252 /* Generate code to handle the destruction of DECL, an object with
6253 static storage duration. */
6256 register_dtor_fn (tree decl)
6263 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6265 type = TREE_TYPE (decl);
6266 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6267 return void_zero_node;
6269 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6270 a class object, we can just pass the destructor to
6271 "__cxa_atexit"; we don't have to build a temporary function to do
6273 use_dtor = (flag_use_cxa_atexit
6274 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6275 && CLASS_TYPE_P (type));
6280 /* Find the destructor. */
6281 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6282 gcc_assert (idx >= 0);
6283 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6284 /* Make sure it is accessible. */
6285 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6289 /* Call build_cleanup before we enter the anonymous function so
6290 that any access checks will be done relative to the current
6291 scope, rather than the scope of the anonymous function. */
6292 build_cleanup (decl);
6294 /* Now start the function. */
6295 cleanup = start_cleanup_fn ();
6297 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6298 to the original function, rather than the anonymous one. That
6299 will make the back end think that nested functions are in use,
6300 which causes confusion. */
6301 push_deferring_access_checks (dk_no_check);
6302 fcall = build_cleanup (decl);
6303 pop_deferring_access_checks ();
6305 /* Create the body of the anonymous function. */
6306 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6307 finish_expr_stmt (fcall);
6308 finish_compound_stmt (compound_stmt);
6312 /* Call atexit with the cleanup function. */
6313 mark_used (cleanup);
6314 cleanup = build_address (cleanup);
6315 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6321 /* We must convert CLEANUP to the type that "__cxa_atexit"
6323 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6324 /* "__cxa_atexit" will pass the address of DECL to the
6325 cleanup function. */
6327 addr = build_address (decl);
6328 /* The declared type of the parameter to "__cxa_atexit" is
6329 "void *". For plain "T*", we could just let the
6330 machinery in cp_build_function_call convert it -- but if the
6331 type is "cv-qualified T *", then we need to convert it
6332 before passing it in, to avoid spurious errors. */
6333 addr = build_nop (ptr_type_node, addr);
6336 /* Since the cleanup functions we build ignore the address
6337 they're given, there's no reason to pass the actual address
6338 in, and, in general, it's cheaper to pass NULL than any
6340 addr = null_pointer_node;
6341 arg2 = cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6342 tf_warning_or_error);
6343 if (targetm.cxx.use_aeabi_atexit ())
6356 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6357 arg0, arg1, arg2, NULL_TREE);
6360 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6361 is its initializer. Generate code to handle the construction
6362 and destruction of DECL. */
6365 expand_static_init (tree decl, tree init)
6367 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6368 gcc_assert (TREE_STATIC (decl));
6370 /* Some variables require no initialization. */
6372 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6373 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6376 if (DECL_FUNCTION_SCOPE_P (decl))
6378 /* Emit code to perform this initialization but once. */
6379 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6380 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6381 tree guard, guard_addr;
6382 tree acquire_fn, release_fn, abort_fn;
6385 /* Emit code to perform this initialization but once. This code
6388 static <type> guard;
6389 if (!guard.first_byte) {
6390 if (__cxa_guard_acquire (&guard)) {
6393 // Do initialization.
6394 flag = true; __cxa_guard_release (&guard);
6395 // Register variable for destruction at end of program.
6397 if (!flag) __cxa_guard_abort (&guard);
6401 Note that the `flag' variable is only set to 1 *after* the
6402 initialization is complete. This ensures that an exception,
6403 thrown during the construction, will cause the variable to
6404 reinitialized when we pass through this code again, as per:
6408 If the initialization exits by throwing an exception, the
6409 initialization is not complete, so it will be tried again
6410 the next time control enters the declaration.
6412 This process should be thread-safe, too; multiple threads
6413 should not be able to initialize the variable more than
6416 /* Create the guard variable. */
6417 guard = get_guard (decl);
6419 /* This optimization isn't safe on targets with relaxed memory
6420 consistency. On such targets we force synchronization in
6421 __cxa_guard_acquire. */
6422 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6424 /* Begin the conditional initialization. */
6425 if_stmt = begin_if_stmt ();
6426 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6427 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6430 if (flag_threadsafe_statics)
6432 guard_addr = build_address (guard);
6434 acquire_fn = get_identifier ("__cxa_guard_acquire");
6435 release_fn = get_identifier ("__cxa_guard_release");
6436 abort_fn = get_identifier ("__cxa_guard_abort");
6437 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6439 tree vfntype = build_function_type_list (void_type_node,
6440 TREE_TYPE (guard_addr),
6442 acquire_fn = push_library_fn
6443 (acquire_fn, build_function_type_list (integer_type_node,
6444 TREE_TYPE (guard_addr),
6447 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6448 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6452 release_fn = identifier_global_value (release_fn);
6453 abort_fn = identifier_global_value (abort_fn);
6456 inner_if_stmt = begin_if_stmt ();
6457 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6460 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6461 begin = get_target_expr (boolean_false_node);
6462 flag = TARGET_EXPR_SLOT (begin);
6464 TARGET_EXPR_CLEANUP (begin)
6465 = build3 (COND_EXPR, void_type_node, flag,
6467 build_call_n (abort_fn, 1, guard_addr));
6468 CLEANUP_EH_ONLY (begin) = 1;
6470 /* Do the initialization itself. */
6471 init = add_stmt_to_compound (begin, init);
6472 init = add_stmt_to_compound
6473 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6474 init = add_stmt_to_compound
6475 (init, build_call_n (release_fn, 1, guard_addr));
6478 init = add_stmt_to_compound (init, set_guard (guard));
6480 /* Use atexit to register a function for destroying this static
6482 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6484 finish_expr_stmt (init);
6486 if (flag_threadsafe_statics)
6488 finish_compound_stmt (inner_then_clause);
6489 finish_then_clause (inner_if_stmt);
6490 finish_if_stmt (inner_if_stmt);
6493 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6495 finish_compound_stmt (then_clause);
6496 finish_then_clause (if_stmt);
6497 finish_if_stmt (if_stmt);
6501 static_aggregates = tree_cons (init, decl, static_aggregates);
6505 /* Make TYPE a complete type based on INITIAL_VALUE.
6506 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6507 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6508 3 if the initializer list is empty (in pedantic mode). */
6511 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6514 tree type, elt_type;
6518 unsigned HOST_WIDE_INT i;
6521 /* An array of character type can be initialized from a
6522 brace-enclosed string constant.
6524 FIXME: this code is duplicated from reshape_init. Probably
6525 we should just call reshape_init here? */
6526 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6527 && TREE_CODE (initial_value) == CONSTRUCTOR
6528 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6530 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6531 tree value = VEC_index (constructor_elt, v, 0)->value;
6533 if (TREE_CODE (value) == STRING_CST
6534 && VEC_length (constructor_elt, v) == 1)
6535 initial_value = value;
6538 /* If any of the elements are parameter packs, we can't actually
6539 complete this type now because the array size is dependent. */
6540 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6542 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6545 if (PACK_EXPANSION_P (value))
6551 failure = complete_array_type (ptype, initial_value, do_default);
6553 /* We can create the array before the element type is complete, which
6554 means that we didn't have these two bits set in the original type
6555 either. In completing the type, we are expected to propagate these
6556 bits. See also complete_type which does the same thing for arrays
6559 if (TYPE_DOMAIN (type))
6561 elt_type = TREE_TYPE (type);
6562 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6563 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6564 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6570 /* Return zero if something is declared to be a member of type
6571 CTYPE when in the context of CUR_TYPE. STRING is the error
6572 message to print in that case. Otherwise, quietly return 1. */
6575 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6577 if (ctype && ctype != cur_type)
6579 if (flags == DTOR_FLAG)
6580 error ("destructor for alien class %qT cannot be a member", ctype);
6582 error ("constructor for alien class %qT cannot be a member", ctype);
6588 /* Subroutine of `grokdeclarator'. */
6590 /* Generate errors possibly applicable for a given set of specifiers.
6591 This is for ARM $7.1.2. */
6594 bad_specifiers (tree object,
6603 error ("%qD declared as a %<virtual%> %s", object, type);
6605 error ("%qD declared as an %<inline%> %s", object, type);
6607 error ("%<const%> and %<volatile%> function specifiers on "
6608 "%qD invalid in %s declaration",
6611 error ("%q+D declared as a friend", object);
6613 && (TREE_CODE (object) == TYPE_DECL
6614 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6615 && !TYPE_REFFN_P (TREE_TYPE (object))
6616 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6617 error ("%q+D declared with an exception specification", object);
6620 /* DECL is a member function or static data member and is presently
6621 being defined. Check that the definition is taking place in a
6625 check_class_member_definition_namespace (tree decl)
6627 /* These checks only apply to member functions and static data
6629 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6630 || TREE_CODE (decl) == VAR_DECL);
6631 /* We check for problems with specializations in pt.c in
6632 check_specialization_namespace, where we can issue better
6634 if (processing_specialization)
6636 /* There are no restrictions on the placement of
6637 explicit instantiations. */
6638 if (processing_explicit_instantiation)
6642 A member function definition that appears outside of the
6643 class definition shall appear in a namespace scope enclosing
6644 the class definition.
6648 The definition for a static data member shall appear in a
6649 namespace scope enclosing the member's class definition. */
6650 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6651 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6652 decl, DECL_CONTEXT (decl));
6655 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6656 METHOD_TYPE for a non-static member function; QUALS are the
6657 cv-qualifiers that apply to the function. */
6660 build_this_parm (tree type, cp_cv_quals quals)
6665 cp_cv_quals this_quals;
6667 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6668 /* The `this' parameter is implicitly `const'; it cannot be
6670 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6671 qual_type = cp_build_qualified_type (this_type, this_quals);
6672 parm = build_artificial_parm (this_identifier, qual_type);
6673 cp_apply_type_quals_to_decl (this_quals, parm);
6677 /* CTYPE is class type, or null if non-class.
6678 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6680 DECLARATOR is the function's name.
6681 PARMS is a chain of PARM_DECLs for the function.
6682 VIRTUALP is truthvalue of whether the function is virtual or not.
6683 FLAGS are to be passed through to `grokclassfn'.
6684 QUALS are qualifiers indicating whether the function is `const'
6686 RAISES is a list of exceptions that this function can raise.
6687 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6688 not look, and -1 if we should not call `grokclassfn' at all.
6690 SFK is the kind of special function (if any) for the new function.
6692 Returns `NULL_TREE' if something goes wrong, after issuing
6693 applicable error messages. */
6696 grokfndecl (tree ctype,
6700 tree orig_declarator,
6702 enum overload_flags flags,
6709 special_function_kind sfk,
6714 location_t location)
6717 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6721 type = build_exception_variant (type, raises);
6723 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6725 /* If we have an explicit location, use it, otherwise use whatever
6726 build_lang_decl used (probably input_location). */
6727 if (location != UNKNOWN_LOCATION)
6728 DECL_SOURCE_LOCATION (decl) = location;
6730 if (TREE_CODE (type) == METHOD_TYPE)
6733 parm = build_this_parm (type, quals);
6734 TREE_CHAIN (parm) = parms;
6737 DECL_ARGUMENTS (decl) = parms;
6738 for (t = parms; t; t = TREE_CHAIN (t))
6739 DECL_CONTEXT (t) = decl;
6740 /* Propagate volatile out from type to decl. */
6741 if (TYPE_VOLATILE (type))
6742 TREE_THIS_VOLATILE (decl) = 1;
6744 /* Setup decl according to sfk. */
6747 case sfk_constructor:
6748 case sfk_copy_constructor:
6749 case sfk_move_constructor:
6750 DECL_CONSTRUCTOR_P (decl) = 1;
6752 case sfk_destructor:
6753 DECL_DESTRUCTOR_P (decl) = 1;
6759 /* If pointers to member functions use the least significant bit to
6760 indicate whether a function is virtual, ensure a pointer
6761 to this function will have that bit clear. */
6762 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6763 && TREE_CODE (type) == METHOD_TYPE
6764 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6765 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6768 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6772 ("defining explicit specialization %qD in friend declaration",
6776 tree fns = TREE_OPERAND (orig_declarator, 0);
6777 tree args = TREE_OPERAND (orig_declarator, 1);
6779 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6781 /* Something like `template <class T> friend void f<T>()'. */
6782 error ("invalid use of template-id %qD in declaration "
6783 "of primary template",
6789 /* A friend declaration of the form friend void f<>(). Record
6790 the information in the TEMPLATE_ID_EXPR. */
6791 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6793 if (TREE_CODE (fns) == COMPONENT_REF)
6795 /* Due to bison parser ickiness, we will have already looked
6796 up an operator_name or PFUNCNAME within the current class
6797 (see template_id in parse.y). If the current class contains
6798 such a name, we'll get a COMPONENT_REF here. Undo that. */
6800 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6801 == current_class_type);
6802 fns = TREE_OPERAND (fns, 1);
6804 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6805 || TREE_CODE (fns) == OVERLOAD);
6806 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6808 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6809 if (TREE_PURPOSE (t)
6810 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6812 error ("default arguments are not allowed in declaration "
6813 "of friend template specialization %qD",
6820 error ("%<inline%> is not allowed in declaration of friend "
6821 "template specialization %qD",
6828 /* If this decl has namespace scope, set that up. */
6830 set_decl_namespace (decl, in_namespace, friendp);
6832 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6834 /* `main' and builtins have implicit 'C' linkage. */
6835 if ((MAIN_NAME_P (declarator)
6836 || (IDENTIFIER_LENGTH (declarator) > 10
6837 && IDENTIFIER_POINTER (declarator)[0] == '_'
6838 && IDENTIFIER_POINTER (declarator)[1] == '_'
6839 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6840 && current_lang_name == lang_name_cplusplus
6841 && ctype == NULL_TREE
6842 /* NULL_TREE means global namespace. */
6843 && DECL_CONTEXT (decl) == NULL_TREE)
6844 SET_DECL_LANGUAGE (decl, lang_c);
6846 /* Should probably propagate const out from type to decl I bet (mrs). */
6849 DECL_STATIC_FUNCTION_P (decl) = 1;
6850 DECL_CONTEXT (decl) = ctype;
6855 DECL_CONTEXT (decl) = ctype;
6857 check_class_member_definition_namespace (decl);
6860 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6862 if (processing_template_decl)
6863 error ("cannot declare %<::main%> to be a template");
6865 error ("cannot declare %<::main%> to be inline");
6867 error ("cannot declare %<::main%> to be static");
6872 /* Members of anonymous types and local classes have no linkage; make
6873 them internal. If a typedef is made later, this will be changed. */
6874 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6875 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6878 if (publicp && cxx_dialect == cxx98)
6880 /* [basic.link]: A name with no linkage (notably, the name of a class
6881 or enumeration declared in a local scope) shall not be used to
6882 declare an entity with linkage.
6884 DR 757 relaxes this restriction for C++0x. */
6885 t = no_linkage_check (TREE_TYPE (decl),
6886 /*relaxed_p=*/false);
6889 if (TYPE_ANONYMOUS_P (t))
6891 if (DECL_EXTERN_C_P (decl))
6892 /* Allow this; it's pretty common in C. */;
6895 permerror (input_location, "anonymous type with no linkage "
6896 "used to declare function %q#D with linkage",
6898 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6899 permerror (input_location, "%q+#D does not refer to the unqualified "
6900 "type, so it is not used for linkage",
6905 permerror (input_location, "type %qT with no linkage used to "
6906 "declare function %q#D with linkage", t, decl);
6910 TREE_PUBLIC (decl) = publicp;
6913 DECL_INTERFACE_KNOWN (decl) = 1;
6914 DECL_NOT_REALLY_EXTERN (decl) = 1;
6917 /* If the declaration was declared inline, mark it as such. */
6919 DECL_DECLARED_INLINE_P (decl) = 1;
6921 DECL_EXTERNAL (decl) = 1;
6922 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6925 ? G_("static member function %qD cannot have cv-qualifier")
6926 : G_("non-member function %qD cannot have cv-qualifier"),
6928 quals = TYPE_UNQUALIFIED;
6931 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6932 && !grok_op_properties (decl, /*complain=*/true))
6936 /* Make the init_value nonzero so pushdecl knows this is not
6937 tentative. error_mark_node is replaced later with the BLOCK. */
6938 DECL_INITIAL (decl) = error_mark_node;
6940 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6941 TREE_NOTHROW (decl) = 1;
6943 /* Caller will do the rest of this. */
6947 if (ctype != NULL_TREE)
6948 grokclassfn (ctype, decl, flags);
6950 decl = check_explicit_specialization (orig_declarator, decl,
6953 4 * (friendp != 0));
6954 if (decl == error_mark_node)
6959 cplus_decl_attributes (&decl, *attrlist, 0);
6960 *attrlist = NULL_TREE;
6963 /* Check main's type after attributes have been applied. */
6964 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6966 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6969 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6971 error ("%<::main%> must return %<int%>");
6972 newtype = build_function_type (integer_type_node, oldtypeargs);
6973 TREE_TYPE (decl) = newtype;
6976 check_main_parameter_types (decl);
6979 if (ctype != NULL_TREE
6980 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6983 tree old_decl = check_classfn (ctype, decl,
6984 (processing_template_decl
6985 > template_class_depth (ctype))
6986 ? current_template_parms
6989 if (old_decl == error_mark_node)
6997 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6998 /* Because grokfndecl is always supposed to return a
6999 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7000 here. We depend on our callers to figure out that its
7001 really a template that's being returned. */
7002 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7004 if (DECL_STATIC_FUNCTION_P (old_decl)
7005 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7006 /* Remove the `this' parm added by grokclassfn.
7007 XXX Isn't this done in start_function, too? */
7008 revert_static_member_fn (decl);
7009 if (DECL_ARTIFICIAL (old_decl))
7011 error ("definition of implicitly-declared %qD", old_decl);
7015 /* Since we've smashed OLD_DECL to its
7016 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7017 if (TREE_CODE (decl) == TEMPLATE_DECL)
7018 decl = DECL_TEMPLATE_RESULT (decl);
7020 /* Attempt to merge the declarations. This can fail, in
7021 the case of some invalid specialization declarations. */
7022 pushed_scope = push_scope (ctype);
7023 ok = duplicate_decls (decl, old_decl, friendp);
7025 pop_scope (pushed_scope);
7028 error ("no %q#D member function declared in class %qT",
7036 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7039 if (ctype == NULL_TREE || check)
7043 DECL_VIRTUAL_P (decl) = 1;
7048 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7049 the linkage that DECL will receive in the object file. */
7052 set_linkage_for_static_data_member (tree decl)
7054 /* A static data member always has static storage duration and
7055 external linkage. Note that static data members are forbidden in
7056 local classes -- the only situation in which a class has
7057 non-external linkage. */
7058 TREE_PUBLIC (decl) = 1;
7059 TREE_STATIC (decl) = 1;
7060 /* For non-template classes, static data members are always put
7061 out in exactly those files where they are defined, just as
7062 with ordinary namespace-scope variables. */
7063 if (!processing_template_decl)
7064 DECL_INTERFACE_KNOWN (decl) = 1;
7067 /* Create a VAR_DECL named NAME with the indicated TYPE.
7069 If SCOPE is non-NULL, it is the class type or namespace containing
7070 the variable. If SCOPE is NULL, the variable should is created in
7071 the innermost enclosings scope. */
7074 grokvardecl (tree type,
7076 const cp_decl_specifier_seq *declspecs,
7082 tree explicit_scope;
7084 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7086 /* Compute the scope in which to place the variable, but remember
7087 whether or not that scope was explicitly specified by the user. */
7088 explicit_scope = scope;
7091 /* An explicit "extern" specifier indicates a namespace-scope
7093 if (declspecs->storage_class == sc_extern)
7094 scope = current_decl_namespace ();
7095 else if (!at_function_scope_p ())
7096 scope = current_scope ();
7100 && (/* If the variable is a namespace-scope variable declared in a
7101 template, we need DECL_LANG_SPECIFIC. */
7102 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7103 /* Similarly for namespace-scope variables with language linkage
7105 || (TREE_CODE (scope) == NAMESPACE_DECL
7106 && current_lang_name != lang_name_cplusplus)
7107 /* Similarly for static data members. */
7109 decl = build_lang_decl (VAR_DECL, name, type);
7111 decl = build_decl (input_location, VAR_DECL, name, type);
7113 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7114 set_decl_namespace (decl, explicit_scope, 0);
7116 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7118 if (declspecs->storage_class == sc_extern)
7120 DECL_THIS_EXTERN (decl) = 1;
7121 DECL_EXTERNAL (decl) = !initialized;
7124 if (DECL_CLASS_SCOPE_P (decl))
7126 set_linkage_for_static_data_member (decl);
7127 /* This function is only called with out-of-class definitions. */
7128 DECL_EXTERNAL (decl) = 0;
7129 check_class_member_definition_namespace (decl);
7131 /* At top level, either `static' or no s.c. makes a definition
7132 (perhaps tentative), and absence of `static' makes it public. */
7133 else if (toplevel_bindings_p ())
7135 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7136 && (DECL_THIS_EXTERN (decl) || ! constp));
7137 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7139 /* Not at top level, only `static' makes a static definition. */
7142 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7143 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7146 if (declspecs->specs[(int)ds_thread])
7147 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7149 /* If the type of the decl has no linkage, make sure that we'll
7150 notice that in mark_used. */
7151 if (cxx_dialect > cxx98
7152 && decl_linkage (decl) != lk_none
7153 && DECL_LANG_SPECIFIC (decl) == NULL
7154 && !DECL_EXTERN_C_P (decl)
7155 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7156 retrofit_lang_decl (decl);
7158 if (TREE_PUBLIC (decl))
7160 /* [basic.link]: A name with no linkage (notably, the name of a class
7161 or enumeration declared in a local scope) shall not be used to
7162 declare an entity with linkage.
7164 DR 757 relaxes this restriction for C++0x. */
7165 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7166 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7169 if (TYPE_ANONYMOUS_P (t))
7171 if (DECL_EXTERN_C_P (decl))
7172 /* Allow this; it's pretty common in C. */
7176 /* DRs 132, 319 and 389 seem to indicate types with
7177 no linkage can only be used to declare extern "C"
7178 entities. Since it's not always an error in the
7179 ISO C++ 90 Standard, we only issue a warning. */
7180 warning (0, "anonymous type with no linkage used to declare "
7181 "variable %q#D with linkage", decl);
7182 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7183 warning (0, "%q+#D does not refer to the unqualified "
7184 "type, so it is not used for linkage",
7189 warning (0, "type %qT with no linkage used to declare variable "
7190 "%q#D with linkage", t, decl);
7194 DECL_INTERFACE_KNOWN (decl) = 1;
7199 /* Create and return a canonical pointer to member function type, for
7200 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7203 build_ptrmemfunc_type (tree type)
7207 tree unqualified_variant = NULL_TREE;
7209 if (type == error_mark_node)
7212 /* If a canonical type already exists for this type, use it. We use
7213 this method instead of type_hash_canon, because it only does a
7214 simple equality check on the list of field members. */
7216 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7219 /* Make sure that we always have the unqualified pointer-to-member
7221 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7223 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7225 t = make_class_type (RECORD_TYPE);
7226 xref_basetypes (t, NULL_TREE);
7228 /* Let the front end know this is a pointer to member function... */
7229 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7230 /* ... and not really a class type. */
7231 SET_CLASS_TYPE_P (t, 0);
7233 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7236 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7238 TREE_CHAIN (field) = fields;
7241 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7243 /* Zap out the name so that the back end will give us the debugging
7244 information for this anonymous RECORD_TYPE. */
7245 TYPE_NAME (t) = NULL_TREE;
7247 /* If this is not the unqualified form of this pointer-to-member
7248 type, set the TYPE_MAIN_VARIANT for this type to be the
7249 unqualified type. Since they are actually RECORD_TYPEs that are
7250 not variants of each other, we must do this manually.
7251 As we just built a new type there is no need to do yet another copy. */
7252 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7254 int type_quals = cp_type_quals (type);
7255 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7256 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7257 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7258 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7259 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7260 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7261 TREE_TYPE (TYPE_BINFO (t)) = t;
7264 /* Cache this pointer-to-member type so that we can find it again
7266 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7268 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7269 SET_TYPE_STRUCTURAL_EQUALITY (t);
7270 else if (TYPE_CANONICAL (type) != type)
7271 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7276 /* Create and return a pointer to data member type. */
7279 build_ptrmem_type (tree class_type, tree member_type)
7281 if (TREE_CODE (member_type) == METHOD_TYPE)
7283 cp_cv_quals quals = type_memfn_quals (member_type);
7284 member_type = build_memfn_type (member_type, class_type, quals);
7285 return build_ptrmemfunc_type (build_pointer_type (member_type));
7289 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7290 return build_offset_type (class_type, member_type);
7294 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7295 Check to see that the definition is valid. Issue appropriate error
7296 messages. Return 1 if the definition is particularly bad, or 0
7300 check_static_variable_definition (tree decl, tree type)
7302 /* Motion 10 at San Diego: If a static const integral data member is
7303 initialized with an integral constant expression, the initializer
7304 may appear either in the declaration (within the class), or in
7305 the definition, but not both. If it appears in the class, the
7306 member is a member constant. The file-scope definition is always
7308 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7310 error ("invalid in-class initialization of static data member "
7311 "of non-integral type %qT",
7313 /* If we just return the declaration, crashes will sometimes
7314 occur. We therefore return void_type_node, as if this were a
7315 friend declaration, to cause callers to completely ignore
7316 this declaration. */
7319 else if (!CP_TYPE_CONST_P (type))
7320 error ("ISO C++ forbids in-class initialization of non-const "
7321 "static member %qD",
7323 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7324 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7325 "%qD of non-integral type %qT", decl, type);
7330 /* Given the SIZE (i.e., number of elements) in an array, compute an
7331 appropriate index type for the array. If non-NULL, NAME is the
7332 name of the thing being declared. */
7335 compute_array_index_type (tree name, tree size)
7339 tree abi_1_itype = NULL_TREE;
7341 if (error_operand_p (size))
7342 return error_mark_node;
7344 type = TREE_TYPE (size);
7345 /* The array bound must be an integer type. */
7346 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7349 error ("size of array %qD has non-integral type %qT", name, type);
7351 error ("size of array has non-integral type %qT", type);
7352 size = integer_one_node;
7353 type = TREE_TYPE (size);
7356 /* We can only call value_dependent_expression_p on integral constant
7357 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7358 set if this isn't one. */
7359 if (processing_template_decl
7360 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7362 /* We cannot do any checking for a SIZE that isn't known to be
7363 constant. Just build the index type and mark that it requires
7364 structural equality checks. */
7365 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7366 size, integer_one_node));
7367 TYPE_DEPENDENT_P (itype) = 1;
7368 TYPE_DEPENDENT_P_VALID (itype) = 1;
7369 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7373 if (!abi_version_at_least (2) && processing_template_decl)
7374 /* For abi-1, we handled all instances in templates the same way,
7375 even when they were non-dependent. This affects the manglings
7376 produced. So, we do the normal checking for non-dependent
7377 sizes, but at the end we'll return the same type that abi-1
7378 would have, but with TYPE_CANONICAL set to the "right"
7379 value that the current ABI would provide. */
7380 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7381 size, integer_one_node));
7383 /* The size might be the result of a cast. */
7384 STRIP_TYPE_NOPS (size);
7386 size = mark_rvalue_use (size);
7388 /* It might be a const variable or enumeration constant. */
7389 size = integral_constant_value (size);
7390 if (error_operand_p (size))
7391 return error_mark_node;
7393 /* Normally, the array-bound will be a constant. */
7394 if (TREE_CODE (size) == INTEGER_CST)
7396 /* Check to see if the array bound overflowed. Make that an
7397 error, no matter how generous we're being. */
7398 constant_expression_error (size);
7400 /* An array must have a positive number of elements. */
7401 if (INT_CST_LT (size, integer_zero_node))
7404 error ("size of array %qD is negative", name);
7406 error ("size of array is negative");
7407 size = integer_one_node;
7409 /* As an extension we allow zero-sized arrays. We always allow
7410 them in system headers because glibc uses them. */
7411 else if (integer_zerop (size) && !in_system_header)
7414 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7416 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7419 else if (TREE_CONSTANT (size))
7421 /* `(int) &fn' is not a valid array bound. */
7423 error ("size of array %qD is not an integral constant-expression",
7426 error ("size of array is not an integral constant-expression");
7427 size = integer_one_node;
7429 else if (pedantic && warn_vla != 0)
7432 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7434 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7436 else if (warn_vla > 0)
7440 "variable length array %qD is used", name);
7443 "variable length array is used");
7446 if (processing_template_decl && !TREE_CONSTANT (size))
7447 /* A variable sized array. */
7448 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7451 HOST_WIDE_INT saved_processing_template_decl;
7453 /* Compute the index of the largest element in the array. It is
7454 one less than the number of elements in the array. We save
7455 and restore PROCESSING_TEMPLATE_DECL so that computations in
7456 cp_build_binary_op will be appropriately folded. */
7457 saved_processing_template_decl = processing_template_decl;
7458 processing_template_decl = 0;
7459 itype = cp_build_binary_op (input_location,
7461 cp_convert (ssizetype, size),
7462 cp_convert (ssizetype, integer_one_node),
7463 tf_warning_or_error);
7464 itype = fold (itype);
7465 processing_template_decl = saved_processing_template_decl;
7467 if (!TREE_CONSTANT (itype))
7468 /* A variable sized array. */
7469 itype = variable_size (itype);
7470 /* Make sure that there was no overflow when creating to a signed
7471 index type. (For example, on a 32-bit machine, an array with
7472 size 2^32 - 1 is too big.) */
7473 else if (TREE_CODE (itype) == INTEGER_CST
7474 && TREE_OVERFLOW (itype))
7476 error ("overflow in array dimension");
7477 TREE_OVERFLOW (itype) = 0;
7481 /* Create and return the appropriate index type. */
7484 tree t = build_index_type (itype);
7485 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7489 return build_index_type (itype);
7492 /* Returns the scope (if any) in which the entity declared by
7493 DECLARATOR will be located. If the entity was declared with an
7494 unqualified name, NULL_TREE is returned. */
7497 get_scope_of_declarator (const cp_declarator *declarator)
7499 while (declarator && declarator->kind != cdk_id)
7500 declarator = declarator->declarator;
7502 /* If the declarator-id is a SCOPE_REF, the scope in which the
7503 declaration occurs is the first operand. */
7505 && declarator->u.id.qualifying_scope)
7506 return declarator->u.id.qualifying_scope;
7508 /* Otherwise, the declarator is not a qualified name; the entity will
7509 be declared in the current scope. */
7513 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7514 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7518 create_array_type_for_decl (tree name, tree type, tree size)
7520 tree itype = NULL_TREE;
7522 /* If things have already gone awry, bail now. */
7523 if (type == error_mark_node || size == error_mark_node)
7524 return error_mark_node;
7526 /* If there are some types which cannot be array elements,
7527 issue an error-message and return. */
7528 switch (TREE_CODE (type))
7532 error ("declaration of %qD as array of void", name);
7534 error ("creating array of void");
7535 return error_mark_node;
7539 error ("declaration of %qD as array of functions", name);
7541 error ("creating array of functions");
7542 return error_mark_node;
7544 case REFERENCE_TYPE:
7546 error ("declaration of %qD as array of references", name);
7548 error ("creating array of references");
7549 return error_mark_node;
7553 error ("declaration of %qD as array of function members", name);
7555 error ("creating array of function members");
7556 return error_mark_node;
7564 The constant expressions that specify the bounds of the arrays
7565 can be omitted only for the first member of the sequence. */
7566 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7569 error ("declaration of %qD as multidimensional array must "
7570 "have bounds for all dimensions except the first",
7573 error ("multidimensional array must have bounds for all "
7574 "dimensions except the first");
7576 return error_mark_node;
7579 /* Figure out the index type for the array. */
7581 itype = compute_array_index_type (name, size);
7584 T is called the array element type; this type shall not be [...] an
7585 abstract class type. */
7586 abstract_virtuals_error (name, type);
7588 return build_cplus_array_type (type, itype);
7591 /* Check that it's OK to declare a function with the indicated TYPE.
7592 SFK indicates the kind of special function (if any) that this
7593 function is. OPTYPE is the type given in a conversion operator
7594 declaration, or the class type for a constructor/destructor.
7595 Returns the actual return type of the function; that
7596 may be different than TYPE if an error occurs, or for certain
7597 special functions. */
7600 check_special_function_return_type (special_function_kind sfk,
7606 case sfk_constructor:
7608 error ("return type specification for constructor invalid");
7610 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7611 type = build_pointer_type (optype);
7613 type = void_type_node;
7616 case sfk_destructor:
7618 error ("return type specification for destructor invalid");
7619 /* We can't use the proper return type here because we run into
7620 problems with ambiguous bases and covariant returns.
7621 Java classes are left unchanged because (void *) isn't a valid
7622 Java type, and we don't want to change the Java ABI. */
7623 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7624 type = build_pointer_type (void_type_node);
7626 type = void_type_node;
7629 case sfk_conversion:
7631 error ("return type specified for %<operator %T%>", optype);
7642 /* A variable or data member (whose unqualified name is IDENTIFIER)
7643 has been declared with the indicated TYPE. If the TYPE is not
7644 acceptable, issue an error message and return a type to use for
7645 error-recovery purposes. */
7648 check_var_type (tree identifier, tree type)
7650 if (VOID_TYPE_P (type))
7653 error ("unnamed variable or field declared void");
7654 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7656 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7657 error ("variable or field %qE declared void", identifier);
7660 error ("variable or field declared void");
7661 type = error_mark_node;
7667 /* Given declspecs and a declarator (abstract or otherwise), determine
7668 the name and type of the object declared and construct a DECL node
7671 DECLSPECS points to the representation of declaration-specifier
7672 sequence that precedes declarator.
7674 DECL_CONTEXT says which syntactic context this declaration is in:
7675 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7676 FUNCDEF for a function definition. Like NORMAL but a few different
7677 error messages in each case. Return value may be zero meaning
7678 this definition is too screwy to try to parse.
7679 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7680 handle member functions (which have FIELD context).
7681 Return value may be zero meaning this definition is too screwy to
7683 PARM for a parameter declaration (either within a function prototype
7684 or before a function body). Make a PARM_DECL, or return void_type_node.
7685 TPARM for a template parameter declaration.
7686 CATCHPARM for a parameter declaration before a catch clause.
7687 TYPENAME if for a typename (in a cast or sizeof).
7688 Don't make a DECL node; just return the ..._TYPE node.
7689 FIELD for a struct or union field; make a FIELD_DECL.
7690 BITFIELD for a field with specified width.
7692 INITIALIZED is as for start_decl.
7694 ATTRLIST is a pointer to the list of attributes, which may be NULL
7695 if there are none; *ATTRLIST may be modified if attributes from inside
7696 the declarator should be applied to the declaration.
7698 When this function is called, scoping variables (such as
7699 CURRENT_CLASS_TYPE) should reflect the scope in which the
7700 declaration occurs, not the scope in which the new declaration will
7701 be placed. For example, on:
7705 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7708 Returns a DECL (if a declarator is present), a TYPE (if there is no
7709 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7713 grokdeclarator (const cp_declarator *declarator,
7714 const cp_decl_specifier_seq *declspecs,
7715 enum decl_context decl_context,
7719 tree type = NULL_TREE;
7721 int explicit_int128 = 0;
7722 int virtualp, explicitp, friendp, inlinep, staticp;
7723 int explicit_int = 0;
7724 int explicit_char = 0;
7725 int defaulted_int = 0;
7726 tree dependent_name = NULL_TREE;
7728 tree typedef_decl = NULL_TREE;
7729 const char *name = NULL;
7730 tree typedef_type = NULL_TREE;
7731 /* True if this declarator is a function definition. */
7732 bool funcdef_flag = false;
7733 cp_declarator_kind innermost_code = cdk_error;
7736 /* See the code below that used this. */
7737 tree decl_attr = NULL_TREE;
7740 /* Keep track of what sort of function is being processed
7741 so that we can warn about default return values, or explicit
7742 return values which do not match prescribed defaults. */
7743 special_function_kind sfk = sfk_none;
7745 tree dname = NULL_TREE;
7746 tree ctor_return_type = NULL_TREE;
7747 enum overload_flags flags = NO_SPECIAL;
7748 /* cv-qualifiers that apply to the declarator, for a declaration of
7749 a member function. */
7750 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7751 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7753 tree raises = NULL_TREE;
7754 int template_count = 0;
7755 tree returned_attrs = NULL_TREE;
7756 tree parms = NULL_TREE;
7757 const cp_declarator *id_declarator;
7758 /* The unqualified name of the declarator; either an
7759 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7760 tree unqualified_id;
7761 /* The class type, if any, in which this entity is located,
7762 or NULL_TREE if none. Note that this value may be different from
7763 the current class type; for example if an attempt is made to declare
7764 "A::f" inside "B", this value will be "A". */
7765 tree ctype = current_class_type;
7766 /* The NAMESPACE_DECL for the namespace in which this entity is
7767 located. If an unqualified name is used to declare the entity,
7768 this value will be NULL_TREE, even if the entity is located at
7770 tree in_namespace = NULL_TREE;
7771 cp_storage_class storage_class;
7772 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7773 bool type_was_error_mark_node = false;
7774 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7775 bool template_type_arg = false;
7776 bool template_parm_flag = false;
7777 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7780 signed_p = declspecs->specs[(int)ds_signed];
7781 unsigned_p = declspecs->specs[(int)ds_unsigned];
7782 short_p = declspecs->specs[(int)ds_short];
7783 long_p = declspecs->specs[(int)ds_long];
7784 longlong = declspecs->specs[(int)ds_long] >= 2;
7785 explicit_int128 = declspecs->explicit_int128_p;
7786 thread_p = declspecs->specs[(int)ds_thread];
7788 if (decl_context == FUNCDEF)
7789 funcdef_flag = true, decl_context = NORMAL;
7790 else if (decl_context == MEMFUNCDEF)
7791 funcdef_flag = true, decl_context = FIELD;
7792 else if (decl_context == BITFIELD)
7793 bitfield = 1, decl_context = FIELD;
7794 else if (decl_context == TEMPLATE_TYPE_ARG)
7795 template_type_arg = true, decl_context = TYPENAME;
7796 else if (decl_context == TPARM)
7797 template_parm_flag = true, decl_context = PARM;
7799 if (initialized > 1)
7800 funcdef_flag = true;
7802 /* Look inside a declarator for the name being declared
7803 and get it as a string, for an error message. */
7804 for (id_declarator = declarator;
7806 id_declarator = id_declarator->declarator)
7808 if (id_declarator->kind != cdk_id)
7809 innermost_code = id_declarator->kind;
7811 switch (id_declarator->kind)
7814 if (id_declarator->declarator
7815 && id_declarator->declarator->kind == cdk_id)
7817 sfk = id_declarator->declarator->u.id.sfk;
7818 if (sfk == sfk_destructor)
7825 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7826 tree decl = id_declarator->u.id.unqualified_name;
7829 if (qualifying_scope)
7831 if (at_function_scope_p ())
7835 A declarator-id shall not be qualified except
7838 None of the cases are permitted in block
7840 if (qualifying_scope == global_namespace)
7841 error ("invalid use of qualified-name %<::%D%>",
7843 else if (TYPE_P (qualifying_scope))
7844 error ("invalid use of qualified-name %<%T::%D%>",
7845 qualifying_scope, decl);
7847 error ("invalid use of qualified-name %<%D::%D%>",
7848 qualifying_scope, decl);
7849 return error_mark_node;
7851 else if (TYPE_P (qualifying_scope))
7853 ctype = qualifying_scope;
7854 if (innermost_code != cdk_function
7855 && current_class_type
7856 && !UNIQUELY_DERIVED_FROM_P (ctype,
7857 current_class_type))
7859 error ("type %qT is not derived from type %qT",
7860 ctype, current_class_type);
7861 return error_mark_node;
7864 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7865 in_namespace = qualifying_scope;
7867 switch (TREE_CODE (decl))
7873 if (innermost_code != cdk_function)
7875 error ("declaration of %qD as non-function", decl);
7876 return error_mark_node;
7878 else if (!qualifying_scope
7879 && !(current_class_type && at_class_scope_p ()))
7881 error ("declaration of %qD as non-member", decl);
7882 return error_mark_node;
7885 type = TREE_OPERAND (decl, 0);
7887 type = constructor_name (type);
7888 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7893 case TEMPLATE_ID_EXPR:
7895 tree fns = TREE_OPERAND (decl, 0);
7898 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7900 gcc_assert (is_overloaded_fn (dname));
7901 dname = DECL_NAME (get_first_fn (dname));
7906 case IDENTIFIER_NODE:
7907 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7910 if (C_IS_RESERVED_WORD (dname))
7912 error ("declarator-id missing; using reserved word %qD",
7914 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7916 else if (!IDENTIFIER_TYPENAME_P (dname))
7917 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7920 gcc_assert (flags == NO_SPECIAL);
7921 flags = TYPENAME_FLAG;
7922 ctor_return_type = TREE_TYPE (dname);
7923 sfk = sfk_conversion;
7924 if (is_typename_at_global_scope (dname))
7925 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7927 name = "<invalid operator>";
7944 return error_mark_node;
7949 if (id_declarator->kind == cdk_id)
7955 The declarator in a function-definition shall have the form
7956 D1 ( parameter-declaration-clause) ... */
7957 if (funcdef_flag && innermost_code != cdk_function)
7959 error ("function definition does not declare parameters");
7960 return error_mark_node;
7963 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7964 && innermost_code != cdk_function
7965 && ! (ctype && !declspecs->any_specifiers_p))
7967 error ("declaration of %qD as non-function", dname);
7968 return error_mark_node;
7971 /* Anything declared one level down from the top level
7972 must be one of the parameters of a function
7973 (because the body is at least two levels down). */
7975 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7976 by not allowing C++ class definitions to specify their parameters
7977 with xdecls (must be spec.d in the parmlist).
7979 Since we now wait to push a class scope until we are sure that
7980 we are in a legitimate method context, we must set oldcname
7981 explicitly (since current_class_name is not yet alive).
7983 We also want to avoid calling this a PARM if it is in a namespace. */
7985 if (decl_context == NORMAL && !toplevel_bindings_p ())
7987 struct cp_binding_level *b = current_binding_level;
7988 current_binding_level = b->level_chain;
7989 if (current_binding_level != 0 && toplevel_bindings_p ())
7990 decl_context = PARM;
7991 current_binding_level = b;
7995 name = decl_context == PARM ? "parameter" : "type name";
7997 /* If there were multiple types specified in the decl-specifier-seq,
7998 issue an error message. */
7999 if (declspecs->multiple_types_p)
8001 error ("two or more data types in declaration of %qs", name);
8002 return error_mark_node;
8005 if (declspecs->conflicting_specifiers_p)
8007 error ("conflicting specifiers in declaration of %qs", name);
8008 return error_mark_node;
8011 /* Extract the basic type from the decl-specifier-seq. */
8012 type = declspecs->type;
8013 if (type == error_mark_node)
8016 type_was_error_mark_node = true;
8018 /* If the entire declaration is itself tagged as deprecated then
8019 suppress reports of deprecated items. */
8020 if (type && TREE_DEPRECATED (type)
8021 && deprecated_state != DEPRECATED_SUPPRESS)
8022 warn_deprecated_use (type, NULL_TREE);
8023 if (type && TREE_CODE (type) == TYPE_DECL)
8025 typedef_decl = type;
8026 type = TREE_TYPE (typedef_decl);
8027 if (TREE_DEPRECATED (type)
8028 && DECL_ARTIFICIAL (typedef_decl)
8029 && deprecated_state != DEPRECATED_SUPPRESS)
8030 warn_deprecated_use (type, NULL_TREE);
8032 /* No type at all: default to `int', and set DEFAULTED_INT
8033 because it was not a user-defined typedef. */
8034 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8036 /* These imply 'int'. */
8037 type = integer_type_node;
8041 explicit_int = declspecs->explicit_int_p;
8042 explicit_char = declspecs->explicit_char_p;
8045 /* See the code below that used this. */
8047 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8049 typedef_type = type;
8052 if (sfk != sfk_conversion)
8053 ctor_return_type = ctype;
8055 if (sfk != sfk_none)
8056 type = check_special_function_return_type (sfk, type,
8058 else if (type == NULL_TREE)
8064 /* We handle `main' specially here, because 'main () { }' is so
8065 common. With no options, it is allowed. With -Wreturn-type,
8066 it is a warning. It is only an error with -pedantic-errors. */
8067 is_main = (funcdef_flag
8068 && dname && MAIN_NAME_P (dname)
8069 && ctype == NULL_TREE
8070 && in_namespace == NULL_TREE
8071 && current_namespace == global_namespace);
8073 if (type_was_error_mark_node)
8074 /* We've already issued an error, don't complain more. */;
8075 else if (in_system_header || flag_ms_extensions)
8076 /* Allow it, sigh. */;
8078 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8080 pedwarn (input_location, OPT_pedantic,
8081 "ISO C++ forbids declaration of %qs with no type", name);
8083 warning (OPT_Wreturn_type,
8084 "ISO C++ forbids declaration of %qs with no type", name);
8086 type = integer_type_node;
8091 /* Now process the modifiers that were specified
8092 and check for invalid combinations. */
8094 /* Long double is a special combination. */
8095 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8098 type = cp_build_qualified_type (long_double_type_node,
8099 cp_type_quals (type));
8102 /* Check all other uses of type modifiers. */
8104 if (unsigned_p || signed_p || long_p || short_p)
8108 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8109 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8110 else if (signed_p && unsigned_p)
8111 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8112 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8113 error ("%<long long%> invalid for %qs", name);
8114 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8115 error ("%<__int128%> invalid for %qs", name);
8116 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8117 error ("%<long%> invalid for %qs", name);
8118 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8119 error ("%<short%> invalid for %qs", name);
8120 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8121 error ("%<long%> or %<short%> invalid for %qs", name);
8122 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8123 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8124 else if ((long_p || short_p) && explicit_char)
8125 error ("%<long%> or %<short%> specified with char for %qs", name);
8126 else if (long_p && short_p)
8127 error ("%<long%> and %<short%> specified together for %qs", name);
8128 else if (type == char16_type_node || type == char32_type_node)
8130 if (signed_p || unsigned_p)
8131 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8132 else if (short_p || long_p)
8133 error ("%<short%> or %<long%> invalid for %qs", name);
8138 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8140 pedwarn (input_location, OPT_pedantic,
8141 "long, short, signed or unsigned used invalidly for %qs",
8143 if (flag_pedantic_errors)
8146 if (explicit_int128)
8148 if (int128_integer_type_node == NULL_TREE)
8150 error ("%<__int128%> is not supported by this target");
8155 pedwarn (input_location, OPT_pedantic,
8156 "ISO C++ does not support %<__int128%> for %qs",
8158 if (flag_pedantic_errors)
8164 /* Discard the type modifiers if they are invalid. */
8172 explicit_int128 = false;
8176 /* Decide whether an integer type is signed or not.
8177 Optionally treat bitfields as signed by default. */
8181 It is implementation-defined whether a plain (neither
8182 explicitly signed or unsigned) char, short, int, or long
8183 bit-field is signed or unsigned.
8185 Naturally, we extend this to long long as well. Note that
8186 this does not include wchar_t. */
8187 || (bitfield && !flag_signed_bitfields
8189 /* A typedef for plain `int' without `signed' can be
8190 controlled just like plain `int', but a typedef for
8191 `signed int' cannot be so controlled. */
8193 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8194 && TREE_CODE (type) == INTEGER_TYPE
8195 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8197 if (explicit_int128)
8198 type = int128_unsigned_type_node;
8200 type = long_long_unsigned_type_node;
8202 type = long_unsigned_type_node;
8204 type = short_unsigned_type_node;
8205 else if (type == char_type_node)
8206 type = unsigned_char_type_node;
8207 else if (typedef_decl)
8208 type = unsigned_type_for (type);
8210 type = unsigned_type_node;
8212 else if (signed_p && type == char_type_node)
8213 type = signed_char_type_node;
8214 else if (explicit_int128)
8215 type = int128_integer_type_node;
8217 type = long_long_integer_type_node;
8219 type = long_integer_type_node;
8221 type = short_integer_type_node;
8223 if (declspecs->specs[(int)ds_complex])
8225 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8226 error ("complex invalid for %qs", name);
8227 /* If we just have "complex", it is equivalent to
8228 "complex double", but if any modifiers at all are specified it is
8229 the complex form of TYPE. E.g, "complex short" is
8230 "complex short int". */
8231 else if (defaulted_int && ! longlong && ! explicit_int128
8232 && ! (long_p || short_p || signed_p || unsigned_p))
8233 type = complex_double_type_node;
8234 else if (type == integer_type_node)
8235 type = complex_integer_type_node;
8236 else if (type == float_type_node)
8237 type = complex_float_type_node;
8238 else if (type == double_type_node)
8239 type = complex_double_type_node;
8240 else if (type == long_double_type_node)
8241 type = complex_long_double_type_node;
8243 type = build_complex_type (type);
8246 type_quals = TYPE_UNQUALIFIED;
8247 if (declspecs->specs[(int)ds_const])
8248 type_quals |= TYPE_QUAL_CONST;
8249 /* A `constexpr' specifier used in an object declaration declares
8250 the object as `const'. */
8253 if (innermost_code == cdk_function)
8255 else if (declspecs->specs[(int)ds_const] != 0)
8256 error ("both %<const%> and %<constexpr%> cannot be used here");
8258 type_quals |= TYPE_QUAL_CONST;
8260 if (declspecs->specs[(int)ds_volatile])
8261 type_quals |= TYPE_QUAL_VOLATILE;
8262 if (declspecs->specs[(int)ds_restrict])
8263 type_quals |= TYPE_QUAL_RESTRICT;
8264 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8265 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8268 type_quals |= cp_type_quals (type);
8269 type = cp_build_qualified_type_real
8270 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8271 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8272 /* We might have ignored or rejected some of the qualifiers. */
8273 type_quals = cp_type_quals (type);
8276 inlinep = !! declspecs->specs[(int)ds_inline];
8277 virtualp = !! declspecs->specs[(int)ds_virtual];
8278 explicitp = !! declspecs->specs[(int)ds_explicit];
8280 storage_class = declspecs->storage_class;
8281 if (storage_class == sc_static)
8282 staticp = 1 + (decl_context == FIELD);
8284 if (virtualp && staticp == 2)
8286 error ("member %qD cannot be declared both virtual and static", dname);
8287 storage_class = sc_none;
8290 friendp = !! declspecs->specs[(int)ds_friend];
8292 if (dependent_name && !friendp)
8294 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8295 return error_mark_node;
8298 /* Issue errors about use of storage classes for parameters. */
8299 if (decl_context == PARM)
8301 if (declspecs->specs[(int)ds_typedef])
8303 error ("typedef declaration invalid in parameter declaration");
8304 return error_mark_node;
8306 else if (template_parm_flag && storage_class != sc_none)
8308 error ("storage class specified for template parameter %qs", name);
8309 return error_mark_node;
8311 else if (storage_class == sc_static
8312 || storage_class == sc_extern
8314 error ("storage class specifiers invalid in parameter declarations");
8316 if (type_uses_auto (type))
8318 error ("parameter declared %<auto%>");
8319 type = error_mark_node;
8322 /* Function parameters cannot be constexpr. If we saw one, moan
8323 and pretend it wasn't there. */
8326 error ("a parameter cannot be declared %<constexpr%>");
8331 /* Give error if `virtual' is used outside of class declaration. */
8333 && (current_class_name == NULL_TREE || decl_context != FIELD))
8335 error ("%<virtual%> outside class declaration");
8339 /* Static anonymous unions are dealt with here. */
8340 if (staticp && decl_context == TYPENAME
8342 && ANON_AGGR_TYPE_P (declspecs->type))
8343 decl_context = FIELD;
8345 /* Warn about storage classes that are invalid for certain
8346 kinds of declarations (parameters, typenames, etc.). */
8349 && storage_class != sc_extern
8350 && storage_class != sc_static)
8351 || declspecs->specs[(int)ds_typedef]))
8353 error ("multiple storage classes in declaration of %qs", name);
8356 if (decl_context != NORMAL
8357 && ((storage_class != sc_none
8358 && storage_class != sc_mutable)
8361 if ((decl_context == PARM || decl_context == CATCHPARM)
8362 && (storage_class == sc_register
8363 || storage_class == sc_auto))
8365 else if (declspecs->specs[(int)ds_typedef])
8367 else if (decl_context == FIELD
8368 /* C++ allows static class elements. */
8369 && storage_class == sc_static)
8370 /* C++ also allows inlines and signed and unsigned elements,
8371 but in those cases we don't come in here. */
8375 if (decl_context == FIELD)
8376 error ("storage class specified for %qs", name);
8379 if (decl_context == PARM || decl_context == CATCHPARM)
8380 error ("storage class specified for parameter %qs", name);
8382 error ("storage class specified for typename");
8384 if (storage_class == sc_register
8385 || storage_class == sc_auto
8386 || storage_class == sc_extern
8388 storage_class = sc_none;
8391 else if (storage_class == sc_extern && funcdef_flag
8392 && ! toplevel_bindings_p ())
8393 error ("nested function %qs declared %<extern%>", name);
8394 else if (toplevel_bindings_p ())
8396 if (storage_class == sc_auto)
8397 error ("top-level declaration of %qs specifies %<auto%>", name);
8400 && storage_class != sc_extern
8401 && storage_class != sc_static)
8403 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8408 if (storage_class && friendp)
8410 error ("storage class specifiers invalid in friend function declarations");
8411 storage_class = sc_none;
8416 unqualified_id = NULL_TREE;
8419 unqualified_id = id_declarator->u.id.unqualified_name;
8420 switch (TREE_CODE (unqualified_id))
8423 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8424 if (TYPE_P (unqualified_id))
8425 unqualified_id = constructor_name (unqualified_id);
8428 case IDENTIFIER_NODE:
8429 case TEMPLATE_ID_EXPR:
8437 /* Determine the type of the entity declared by recurring on the
8439 for (; declarator; declarator = declarator->declarator)
8441 const cp_declarator *inner_declarator;
8444 if (type == error_mark_node)
8445 return error_mark_node;
8447 attrs = declarator->attributes;
8453 if (declarator == NULL || declarator->kind == cdk_id)
8454 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8455 if (declarator->kind == cdk_function)
8456 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8457 if (declarator->kind == cdk_array)
8458 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8459 returned_attrs = decl_attributes (&type,
8460 chainon (returned_attrs, attrs),
8464 if (declarator->kind == cdk_id)
8467 inner_declarator = declarator->declarator;
8469 switch (declarator->kind)
8472 type = create_array_type_for_decl (dname, type,
8473 declarator->u.array.bounds);
8481 /* Declaring a function type.
8482 Make sure we have a valid type for the function to return. */
8484 if (type_quals != TYPE_UNQUALIFIED)
8486 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8487 warning (OPT_Wignored_qualifiers,
8488 "type qualifiers ignored on function return type");
8489 /* We now know that the TYPE_QUALS don't apply to the
8490 decl, but to its return type. */
8491 type_quals = TYPE_UNQUALIFIED;
8493 errmsg = targetm.invalid_return_type (type);
8497 type = integer_type_node;
8500 /* Error about some types functions can't return. */
8502 if (TREE_CODE (type) == FUNCTION_TYPE)
8504 error ("%qs declared as function returning a function", name);
8505 return error_mark_node;
8507 if (TREE_CODE (type) == ARRAY_TYPE)
8509 error ("%qs declared as function returning an array", name);
8510 return error_mark_node;
8513 /* Pick up type qualifiers which should be applied to `this'. */
8514 memfn_quals = declarator->u.function.qualifiers;
8516 /* Pick up the exception specifications. */
8517 raises = declarator->u.function.exception_specification;
8519 /* Say it's a definition only for the CALL_EXPR
8520 closest to the identifier. */
8521 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8523 /* Handle a late-specified return type. */
8526 if (type_uses_auto (type))
8528 if (!declarator->u.function.late_return_type)
8530 error ("%qs function uses %<auto%> type specifier without"
8531 " late return type", name);
8532 return error_mark_node;
8534 else if (!is_auto (type))
8536 error ("%qs function with late return type has"
8537 " %qT as its type rather than plain %<auto%>",
8539 return error_mark_node;
8542 else if (declarator->u.function.late_return_type)
8544 error ("%qs function with late return type not declared"
8545 " with %<auto%> type specifier", name);
8546 return error_mark_node;
8549 type = splice_late_return_type
8550 (type, declarator->u.function.late_return_type);
8551 if (type == error_mark_node)
8552 return error_mark_node;
8554 if (ctype == NULL_TREE
8555 && decl_context == FIELD
8557 && (friendp == 0 || dname == current_class_name))
8558 ctype = current_class_type;
8560 if (ctype && (sfk == sfk_constructor
8561 || sfk == sfk_destructor))
8563 /* We are within a class's scope. If our declarator name
8564 is the same as the class name, and we are defining
8565 a function, then it is a constructor/destructor, and
8566 therefore returns a void type. */
8568 /* ISO C++ 12.4/2. A destructor may not be declared
8569 const or volatile. A destructor may not be
8572 ISO C++ 12.1. A constructor may not be declared
8573 const or volatile. A constructor may not be
8574 virtual. A constructor may not be static. */
8576 error ((flags == DTOR_FLAG)
8577 ? "destructor cannot be static member function"
8578 : "constructor cannot be static member function");
8581 error ((flags == DTOR_FLAG)
8582 ? "destructors may not be cv-qualified"
8583 : "constructors may not be cv-qualified");
8584 memfn_quals = TYPE_UNQUALIFIED;
8587 if (decl_context == FIELD
8588 && !member_function_or_else (ctype,
8591 return error_mark_node;
8593 if (flags != DTOR_FLAG)
8595 /* It's a constructor. */
8600 permerror (input_location, "constructors cannot be declared virtual");
8603 if (decl_context == FIELD
8604 && sfk != sfk_constructor)
8605 return error_mark_node;
8607 if (decl_context == FIELD)
8613 error ("can't initialize friend function %qs", name);
8616 /* Cannot be both friend and virtual. */
8617 error ("virtual functions cannot be friends");
8620 if (decl_context == NORMAL)
8621 error ("friend declaration not in class definition");
8622 if (current_function_decl && funcdef_flag)
8623 error ("can't define friend function %qs in a local "
8627 else if (ctype && sfk == sfk_conversion)
8631 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8636 /* It is not allowed to use `constexpr' in a function
8637 declaration that is not a definition.
8638 That is too strict, though. */
8639 if (constexpr_p && !funcdef_flag)
8641 error ("the %<constexpr%> specifier cannot be used in "
8642 "a function declaration that is not a definition");
8643 constexpr_p = false;
8646 /* A constexpr non-static member function is implicitly const. */
8647 if (constexpr_p && decl_context == FIELD && staticp == 0
8648 && sfk != sfk_constructor && sfk != sfk_destructor)
8649 memfn_quals |= TYPE_QUAL_CONST;
8651 arg_types = grokparms (declarator->u.function.parameters,
8654 if (inner_declarator
8655 && inner_declarator->kind == cdk_id
8656 && inner_declarator->u.id.sfk == sfk_destructor
8657 && arg_types != void_list_node)
8659 error ("destructors may not have parameters");
8660 arg_types = void_list_node;
8664 type = build_function_type (type, arg_types);
8671 /* Filter out pointers-to-references and references-to-references.
8672 We can get these if a TYPE_DECL is used. */
8674 if (TREE_CODE (type) == REFERENCE_TYPE)
8676 if (declarator->kind != cdk_reference)
8678 error ("cannot declare pointer to %q#T", type);
8679 type = TREE_TYPE (type);
8682 /* In C++0x, we allow reference to reference declarations
8683 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8684 and template type arguments [14.3.1/4 temp.arg.type]. The
8685 check for direct reference to reference declarations, which
8686 are still forbidden, occurs below. Reasoning behind the change
8687 can be found in DR106, DR540, and the rvalue reference
8689 else if (cxx_dialect == cxx98)
8691 error ("cannot declare reference to %q#T", type);
8692 type = TREE_TYPE (type);
8695 else if (VOID_TYPE_P (type))
8697 if (declarator->kind == cdk_reference)
8698 error ("cannot declare reference to %q#T", type);
8699 else if (declarator->kind == cdk_ptrmem)
8700 error ("cannot declare pointer to %q#T member", type);
8703 /* We now know that the TYPE_QUALS don't apply to the decl,
8704 but to the target of the pointer. */
8705 type_quals = TYPE_UNQUALIFIED;
8707 if (declarator->kind == cdk_ptrmem
8708 && (TREE_CODE (type) == FUNCTION_TYPE
8709 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8711 memfn_quals |= type_memfn_quals (type);
8712 type = build_memfn_type (type,
8713 declarator->u.pointer.class_type,
8715 memfn_quals = TYPE_UNQUALIFIED;
8718 if (TREE_CODE (type) == FUNCTION_TYPE
8719 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8720 error (declarator->kind == cdk_reference
8721 ? G_("cannot declare reference to qualified function type %qT")
8722 : G_("cannot declare pointer to qualified function type %qT"),
8725 /* When the pointed-to type involves components of variable size,
8726 care must be taken to ensure that the size evaluation code is
8727 emitted early enough to dominate all the possible later uses
8728 and late enough for the variables on which it depends to have
8731 This is expected to happen automatically when the pointed-to
8732 type has a name/declaration of it's own, but special attention
8733 is required if the type is anonymous.
8735 We handle the NORMAL and FIELD contexts here by inserting a
8736 dummy statement that just evaluates the size at a safe point
8737 and ensures it is not deferred until e.g. within a deeper
8738 conditional context (c++/43555).
8740 We expect nothing to be needed here for PARM or TYPENAME.
8741 Evaluating the size at this point for TYPENAME would
8742 actually be incorrect, as we might be in the middle of an
8743 expression with side effects on the pointed-to type size
8744 "arguments" prior to the pointer declaration point and the
8745 size evaluation could end up prior to the side effects. */
8747 if (!TYPE_NAME (type)
8748 && (decl_context == NORMAL || decl_context == FIELD)
8749 && at_function_scope_p ()
8750 && variably_modified_type_p (type, NULL_TREE))
8751 finish_expr_stmt (TYPE_SIZE (type));
8753 if (declarator->kind == cdk_reference)
8755 /* In C++0x, the type we are creating a reference to might be
8756 a typedef which is itself a reference type. In that case,
8757 we follow the reference collapsing rules in
8758 [7.1.3/8 dcl.typedef] to create the final reference type:
8760 "If a typedef TD names a type that is a reference to a type
8761 T, an attempt to create the type 'lvalue reference to cv TD'
8762 creates the type 'lvalue reference to T,' while an attempt
8763 to create the type "rvalue reference to cv TD' creates the
8766 if (!VOID_TYPE_P (type))
8767 type = cp_build_reference_type
8768 ((TREE_CODE (type) == REFERENCE_TYPE
8769 ? TREE_TYPE (type) : type),
8770 (declarator->u.reference.rvalue_ref
8771 && (TREE_CODE(type) != REFERENCE_TYPE
8772 || TYPE_REF_IS_RVALUE (type))));
8774 /* In C++0x, we need this check for direct reference to
8775 reference declarations, which are forbidden by
8776 [8.3.2/5 dcl.ref]. Reference to reference declarations
8777 are only allowed indirectly through typedefs and template
8778 type arguments. Example:
8780 void foo(int & &); // invalid ref-to-ref decl
8782 typedef int & int_ref;
8783 void foo(int_ref &); // valid ref-to-ref decl
8785 if (inner_declarator && inner_declarator->kind == cdk_reference)
8786 error ("cannot declare reference to %q#T, which is not "
8787 "a typedef or a template type argument", type);
8789 else if (TREE_CODE (type) == METHOD_TYPE)
8790 type = build_ptrmemfunc_type (build_pointer_type (type));
8791 else if (declarator->kind == cdk_ptrmem)
8793 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8795 if (declarator->u.pointer.class_type == error_mark_node)
8796 /* We will already have complained. */
8797 type = error_mark_node;
8799 type = build_ptrmem_type (declarator->u.pointer.class_type,
8803 type = build_pointer_type (type);
8805 /* Process a list of type modifier keywords (such as
8806 const or volatile) that were given inside the `*' or `&'. */
8808 if (declarator->u.pointer.qualifiers)
8811 = cp_build_qualified_type (type,
8812 declarator->u.pointer.qualifiers);
8813 type_quals = cp_type_quals (type);
8826 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8827 && TREE_CODE (type) != FUNCTION_TYPE
8828 && TREE_CODE (type) != METHOD_TYPE)
8830 error ("template-id %qD used as a declarator",
8832 unqualified_id = dname;
8835 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8836 qualified with a class-name, turn it into a METHOD_TYPE, unless
8837 we know that the function is static. We take advantage of this
8838 opportunity to do other processing that pertains to entities
8839 explicitly declared to be class members. Note that if DECLARATOR
8840 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8841 would not have exited the loop above. */
8843 && declarator->u.id.qualifying_scope
8844 && TYPE_P (declarator->u.id.qualifying_scope))
8848 ctype = declarator->u.id.qualifying_scope;
8849 ctype = TYPE_MAIN_VARIANT (ctype);
8851 while (t != NULL_TREE && CLASS_TYPE_P (t))
8853 /* You're supposed to have one `template <...>' for every
8854 template class, but you don't need one for a full
8855 specialization. For example:
8857 template <class T> struct S{};
8858 template <> struct S<int> { void f(); };
8859 void S<int>::f () {}
8861 is correct; there shouldn't be a `template <>' for the
8862 definition of `S<int>::f'. */
8863 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8864 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8865 /* T is an explicit (not partial) specialization. All
8866 containing classes must therefore also be explicitly
8869 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8870 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8871 template_count += 1;
8873 t = TYPE_MAIN_DECL (t);
8874 t = DECL_CONTEXT (t);
8877 if (ctype == current_class_type)
8881 permerror (input_location, "member functions are implicitly friends of their class");
8885 permerror (declarator->id_loc,
8886 "extra qualification %<%T::%> on member %qs",
8889 else if (/* If the qualifying type is already complete, then we
8890 can skip the following checks. */
8891 !COMPLETE_TYPE_P (ctype)
8892 && (/* If the function is being defined, then
8893 qualifying type must certainly be complete. */
8895 /* A friend declaration of "T::f" is OK, even if
8896 "T" is a template parameter. But, if this
8897 function is not a friend, the qualifying type
8899 || (!friendp && !CLASS_TYPE_P (ctype))
8900 /* For a declaration, the type need not be
8901 complete, if either it is dependent (since there
8902 is no meaningful definition of complete in that
8903 case) or the qualifying class is currently being
8905 || !(dependent_type_p (ctype)
8906 || currently_open_class (ctype)))
8907 /* Check that the qualifying type is complete. */
8908 && !complete_type_or_else (ctype, NULL_TREE))
8909 return error_mark_node;
8910 else if (TREE_CODE (type) == FUNCTION_TYPE)
8912 tree sname = declarator->u.id.unqualified_name;
8914 if (current_class_type
8915 && (!friendp || funcdef_flag))
8918 ? "cannot define member function %<%T::%s%> within %<%T%>"
8919 : "cannot declare member function %<%T::%s%> within %<%T%>",
8920 ctype, name, current_class_type);
8921 return error_mark_node;
8924 /* It is not permitted to define a member function outside ist
8925 membership class as `constexpr'. */
8927 error ("a constexpr function cannot be defined "
8928 "outside of its class");
8930 if (TREE_CODE (sname) == IDENTIFIER_NODE
8931 && NEW_DELETE_OPNAME_P (sname))
8932 /* Overloaded operator new and operator delete
8933 are always static functions. */
8936 type = build_memfn_type (type, ctype, memfn_quals);
8938 else if (declspecs->specs[(int)ds_typedef]
8939 && current_class_type)
8941 error ("cannot declare member %<%T::%s%> within %qT",
8942 ctype, name, current_class_type);
8943 return error_mark_node;
8947 /* Now TYPE has the actual type. */
8952 *attrlist = chainon (returned_attrs, *attrlist);
8954 attrlist = &returned_attrs;
8957 /* Handle parameter packs. */
8958 if (parameter_pack_p)
8960 if (decl_context == PARM)
8961 /* Turn the type into a pack expansion.*/
8962 type = make_pack_expansion (type);
8964 error ("non-parameter %qs cannot be a parameter pack", name);
8967 /* Did array size calculations overflow? */
8969 if (TREE_CODE (type) == ARRAY_TYPE
8970 && COMPLETE_TYPE_P (type)
8971 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8972 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8974 error ("size of array %qs is too large", name);
8975 /* If we proceed with the array type as it is, we'll eventually
8976 crash in tree_low_cst(). */
8977 type = error_mark_node;
8980 if ((decl_context == FIELD || decl_context == PARM)
8981 && !processing_template_decl
8982 && variably_modified_type_p (type, NULL_TREE))
8984 if (decl_context == FIELD)
8985 error ("data member may not have variably modified type %qT", type);
8987 error ("parameter may not have variably modified type %qT", type);
8988 type = error_mark_node;
8991 if (explicitp == 1 || (explicitp && friendp))
8993 /* [dcl.fct.spec] The explicit specifier shall only be used in
8994 declarations of constructors within a class definition. */
8995 error ("only declarations of constructors can be %<explicit%>");
8999 if (storage_class == sc_mutable)
9001 if (decl_context != FIELD || friendp)
9003 error ("non-member %qs cannot be declared %<mutable%>", name);
9004 storage_class = sc_none;
9006 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9008 error ("non-object member %qs cannot be declared %<mutable%>", name);
9009 storage_class = sc_none;
9011 else if (TREE_CODE (type) == FUNCTION_TYPE
9012 || TREE_CODE (type) == METHOD_TYPE)
9014 error ("function %qs cannot be declared %<mutable%>", name);
9015 storage_class = sc_none;
9019 error ("static %qs cannot be declared %<mutable%>", name);
9020 storage_class = sc_none;
9022 else if (type_quals & TYPE_QUAL_CONST)
9024 error ("const %qs cannot be declared %<mutable%>", name);
9025 storage_class = sc_none;
9029 /* If this is declaring a typedef name, return a TYPE_DECL. */
9030 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9034 /* Note that the grammar rejects storage classes
9035 in typenames, fields or parameters. */
9036 if (current_lang_name == lang_name_java)
9037 TYPE_FOR_JAVA (type) = 1;
9039 /* This declaration:
9041 typedef void f(int) const;
9043 declares a function type which is not a member of any
9044 particular class, but which is cv-qualified; for
9045 example "f S::*" declares a pointer to a const-qualified
9046 member function of S. We record the cv-qualification in the
9048 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9050 type = apply_memfn_quals (type, memfn_quals);
9052 /* We have now dealt with these qualifiers. */
9053 memfn_quals = TYPE_UNQUALIFIED;
9056 if (decl_context == FIELD)
9057 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9059 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9060 if (id_declarator && declarator->u.id.qualifying_scope) {
9061 error_at (DECL_SOURCE_LOCATION (decl),
9062 "typedef name may not be a nested-name-specifier");
9063 TREE_TYPE (decl) = error_mark_node;
9066 if (decl_context != FIELD)
9068 if (!current_function_decl)
9069 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9070 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9071 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9072 (current_function_decl)))
9073 /* The TYPE_DECL is "abstract" because there will be
9074 clones of this constructor/destructor, and there will
9075 be copies of this TYPE_DECL generated in those
9077 DECL_ABSTRACT (decl) = 1;
9079 else if (constructor_name_p (unqualified_id, current_class_type))
9080 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9081 "as enclosing class",
9084 /* If the user declares "typedef struct {...} foo" then the
9085 struct will have an anonymous name. Fill that name in now.
9086 Nothing can refer to it, so nothing needs know about the name
9088 if (type != error_mark_node
9091 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9092 && TYPE_ANONYMOUS_P (type)
9093 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9097 /* Replace the anonymous name with the real name everywhere. */
9098 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9100 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9101 /* We do not rename the debug info representing the
9102 anonymous tagged type because the standard says in
9103 [dcl.typedef] that the naming applies only for
9104 linkage purposes. */
9105 /*debug_hooks->set_name (t, decl);*/
9106 TYPE_NAME (t) = decl;
9109 if (TYPE_LANG_SPECIFIC (type))
9110 TYPE_WAS_ANONYMOUS (type) = 1;
9112 /* If this is a typedef within a template class, the nested
9113 type is a (non-primary) template. The name for the
9114 template needs updating as well. */
9115 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9116 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9117 = TYPE_IDENTIFIER (type);
9119 /* Adjust linkage now that we aren't anonymous anymore. */
9120 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9121 determine_visibility (TYPE_MAIN_DECL (type));
9123 /* FIXME remangle member functions; member functions of a
9124 type with external linkage have external linkage. */
9128 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9129 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9131 bad_specifiers (decl, "type", virtualp,
9132 memfn_quals != TYPE_UNQUALIFIED,
9133 inlinep, friendp, raises != NULL_TREE);
9138 /* Detect the case of an array type of unspecified size
9139 which came, as such, direct from a typedef name.
9140 We must copy the type, so that the array's domain can be
9141 individually set by the object's initializer. */
9143 if (type && typedef_type
9144 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9145 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9146 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9148 /* Detect where we're using a typedef of function type to declare a
9149 function. PARMS will not be set, so we must create it now. */
9151 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9153 tree decls = NULL_TREE;
9156 for (args = TYPE_ARG_TYPES (type);
9157 args && args != void_list_node;
9158 args = TREE_CHAIN (args))
9160 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9162 TREE_CHAIN (decl) = decls;
9166 parms = nreverse (decls);
9168 if (decl_context != TYPENAME)
9170 /* A cv-qualifier-seq shall only be part of the function type
9171 for a non-static member function. [8.3.5/4 dcl.fct] */
9172 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9173 && (current_class_type == NULL_TREE || staticp) )
9176 ? G_("qualified function types cannot be used to "
9177 "declare static member functions")
9178 : G_("qualified function types cannot be used to "
9179 "declare free functions"));
9180 type = TYPE_MAIN_VARIANT (type);
9183 /* The qualifiers on the function type become the qualifiers on
9184 the non-static member function. */
9185 memfn_quals |= type_memfn_quals (type);
9186 type_quals = TYPE_UNQUALIFIED;
9190 /* If this is a type name (such as, in a cast or sizeof),
9191 compute the type and return it now. */
9193 if (decl_context == TYPENAME)
9195 /* Note that the grammar rejects storage classes
9196 in typenames, fields or parameters. */
9197 if (type_quals != TYPE_UNQUALIFIED)
9198 type_quals = TYPE_UNQUALIFIED;
9200 /* Special case: "friend class foo" looks like a TYPENAME context. */
9203 if (type_quals != TYPE_UNQUALIFIED)
9205 error ("type qualifiers specified for friend class declaration");
9206 type_quals = TYPE_UNQUALIFIED;
9210 error ("%<inline%> specified for friend class declaration");
9216 /* Don't allow friend declaration without a class-key. */
9217 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9218 permerror (input_location, "template parameters cannot be friends");
9219 else if (TREE_CODE (type) == TYPENAME_TYPE)
9220 permerror (input_location, "friend declaration requires class-key, "
9221 "i.e. %<friend class %T::%D%>",
9222 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9224 permerror (input_location, "friend declaration requires class-key, "
9225 "i.e. %<friend %#T%>",
9229 /* Only try to do this stuff if we didn't already give up. */
9230 if (type != integer_type_node)
9232 /* A friendly class? */
9233 if (current_class_type)
9234 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9237 error ("trying to make class %qT a friend of global scope",
9240 type = void_type_node;
9243 else if (memfn_quals)
9245 if (ctype == NULL_TREE
9246 && TREE_CODE (type) == METHOD_TYPE)
9247 ctype = TYPE_METHOD_BASETYPE (type);
9250 type = build_memfn_type (type, ctype, memfn_quals);
9251 /* Core issue #547: need to allow this in template type args. */
9252 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9253 type = apply_memfn_quals (type, memfn_quals);
9255 error ("invalid qualifiers on non-member function type");
9260 else if (unqualified_id == NULL_TREE && decl_context != PARM
9261 && decl_context != CATCHPARM
9262 && TREE_CODE (type) != UNION_TYPE
9265 error ("abstract declarator %qT used as declaration", type);
9266 return error_mark_node;
9269 /* Only functions may be declared using an operator-function-id. */
9271 && IDENTIFIER_OPNAME_P (unqualified_id)
9272 && TREE_CODE (type) != FUNCTION_TYPE
9273 && TREE_CODE (type) != METHOD_TYPE)
9275 error ("declaration of %qD as non-function", unqualified_id);
9276 return error_mark_node;
9279 /* We don't check parameter types here because we can emit a better
9280 error message later. */
9281 if (decl_context != PARM)
9283 type = check_var_type (unqualified_id, type);
9284 if (type == error_mark_node)
9285 return error_mark_node;
9288 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9289 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9291 if (decl_context == PARM || decl_context == CATCHPARM)
9293 if (ctype || in_namespace)
9294 error ("cannot use %<::%> in parameter declaration");
9296 /* A parameter declared as an array of T is really a pointer to T.
9297 One declared as a function is really a pointer to a function.
9298 One declared as a member is really a pointer to member. */
9300 if (TREE_CODE (type) == ARRAY_TYPE)
9302 /* Transfer const-ness of array into that of type pointed to. */
9303 type = build_pointer_type (TREE_TYPE (type));
9304 type_quals = TYPE_UNQUALIFIED;
9306 else if (TREE_CODE (type) == FUNCTION_TYPE)
9307 type = build_pointer_type (type);
9313 if (decl_context == PARM)
9315 decl = cp_build_parm_decl (unqualified_id, type);
9317 bad_specifiers (decl, "parameter", virtualp,
9318 memfn_quals != TYPE_UNQUALIFIED,
9319 inlinep, friendp, raises != NULL_TREE);
9321 else if (decl_context == FIELD)
9323 /* The C99 flexible array extension. */
9324 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9325 && TYPE_DOMAIN (type) == NULL_TREE)
9327 tree itype = compute_array_index_type (dname, integer_zero_node);
9328 type = build_cplus_array_type (TREE_TYPE (type), itype);
9331 if (type == error_mark_node)
9333 /* Happens when declaring arrays of sizes which
9334 are error_mark_node, for example. */
9337 else if (in_namespace && !friendp)
9339 /* Something like struct S { int N::j; }; */
9340 error ("invalid use of %<::%>");
9341 return error_mark_node;
9343 else if (TREE_CODE (type) == FUNCTION_TYPE)
9346 tree function_context;
9350 if (ctype == NULL_TREE)
9351 ctype = current_class_type;
9353 if (ctype == NULL_TREE)
9355 error ("can't make %qD into a method -- not in a class",
9357 return error_mark_node;
9360 /* ``A union may [ ... ] not [ have ] virtual functions.''
9362 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9364 error ("function %qD declared virtual inside a union",
9366 return error_mark_node;
9369 if (NEW_DELETE_OPNAME_P (unqualified_id))
9373 error ("%qD cannot be declared virtual, since it "
9379 else if (staticp < 2)
9380 type = build_memfn_type (type, ctype, memfn_quals);
9383 /* Check that the name used for a destructor makes sense. */
9384 if (sfk == sfk_destructor)
9386 tree uqname = id_declarator->u.id.unqualified_name;
9390 gcc_assert (friendp);
9391 error ("expected qualified name in friend declaration "
9392 "for destructor %qD", uqname);
9393 return error_mark_node;
9396 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9398 error ("declaration of %qD as member of %qT",
9400 return error_mark_node;
9403 error ("a destructor cannot be %<constexpr%>");
9405 else if (sfk == sfk_constructor && friendp)
9407 error ("expected qualified name in friend declaration "
9408 "for constructor %qD",
9409 id_declarator->u.id.unqualified_name);
9410 return error_mark_node;
9413 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9414 function_context = (ctype != NULL_TREE) ?
9415 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9416 publicp = (! friendp || ! staticp)
9417 && function_context == NULL_TREE;
9418 decl = grokfndecl (ctype, type,
9419 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9420 ? unqualified_id : dname,
9423 virtualp, flags, memfn_quals, raises,
9424 friendp ? -1 : 0, friendp, publicp,
9425 inlinep || constexpr_p,
9427 funcdef_flag, template_count, in_namespace,
9428 attrlist, declarator->id_loc);
9429 if (decl == NULL_TREE)
9430 return error_mark_node;
9432 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9433 /* The decl and setting of decl_attr is also turned off. */
9434 decl = build_decl_attribute_variant (decl, decl_attr);
9437 /* [class.conv.ctor]
9439 A constructor declared without the function-specifier
9440 explicit that can be called with a single parameter
9441 specifies a conversion from the type of its first
9442 parameter to the type of its class. Such a constructor
9443 is called a converting constructor. */
9445 DECL_NONCONVERTING_P (decl) = 1;
9447 else if (TREE_CODE (type) == METHOD_TYPE)
9449 /* We only get here for friend declarations of
9450 members of other classes. */
9451 /* All method decls are public, so tell grokfndecl to set
9452 TREE_PUBLIC, also. */
9453 decl = grokfndecl (ctype, type,
9454 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9455 ? unqualified_id : dname,
9458 virtualp, flags, memfn_quals, raises,
9459 friendp ? -1 : 0, friendp, 1, 0, sfk,
9460 funcdef_flag, template_count, in_namespace,
9462 declarator->id_loc);
9463 if (decl == NULL_TREE)
9464 return error_mark_node;
9466 else if (!staticp && !dependent_type_p (type)
9467 && !COMPLETE_TYPE_P (complete_type (type))
9468 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9471 error ("field %qD has incomplete type", unqualified_id);
9473 error ("name %qT has incomplete type", type);
9475 /* If we're instantiating a template, tell them which
9476 instantiation made the field's type be incomplete. */
9477 if (current_class_type
9478 && TYPE_NAME (current_class_type)
9479 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9481 && declspecs->type == type)
9482 error (" in instantiation of template %qT",
9483 current_class_type);
9485 return error_mark_node;
9491 error ("%qE is neither function nor member function; "
9492 "cannot be declared friend", unqualified_id);
9500 /* Friends are treated specially. */
9501 if (ctype == current_class_type)
9502 ; /* We already issued a permerror. */
9503 else if (decl && DECL_NAME (decl))
9505 if (template_class_depth (current_class_type) == 0)
9507 decl = check_explicit_specialization
9508 (unqualified_id, decl, template_count,
9509 2 * funcdef_flag + 4);
9510 if (decl == error_mark_node)
9511 return error_mark_node;
9514 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9515 decl = do_friend (ctype, unqualified_id, decl,
9521 return error_mark_node;
9524 /* Structure field. It may not be a function, except for C++. */
9526 if (decl == NULL_TREE)
9532 /* An attempt is being made to initialize a non-static
9533 member. But, from [class.mem]:
9535 4 A member-declarator can contain a
9536 constant-initializer only if it declares a static
9537 member (_class.static_) of integral or enumeration
9538 type, see _class.static.data_.
9540 This used to be relatively common practice, but
9541 the rest of the compiler does not correctly
9542 handle the initialization unless the member is
9543 static so we make it static below. */
9544 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9546 permerror (input_location, "making %qD static", unqualified_id);
9550 if (uses_template_parms (type))
9551 /* We'll check at instantiation time. */
9553 else if (check_static_variable_definition (unqualified_id,
9555 /* If we just return the declaration, crashes
9556 will sometimes occur. We therefore return
9557 void_type_node, as if this was a friend
9558 declaration, to cause callers to completely
9559 ignore this declaration. */
9560 return error_mark_node;
9565 /* C++ allows static class members. All other work
9566 for this is done by grokfield. */
9567 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9568 set_linkage_for_static_data_member (decl);
9569 /* Even if there is an in-class initialization, DECL
9570 is considered undefined until an out-of-class
9571 definition is provided. */
9572 DECL_EXTERNAL (decl) = 1;
9575 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9580 error ("non-static data member %qE declared %<constexpr%>",
9582 decl = build_decl (input_location,
9583 FIELD_DECL, unqualified_id, type);
9584 DECL_NONADDRESSABLE_P (decl) = bitfield;
9585 if (bitfield && !unqualified_id)
9586 TREE_NO_WARNING (decl) = 1;
9588 if (storage_class == sc_mutable)
9590 DECL_MUTABLE_P (decl) = 1;
9591 storage_class = sc_none;
9595 bad_specifiers (decl, "field", virtualp,
9596 memfn_quals != TYPE_UNQUALIFIED,
9597 inlinep, friendp, raises != NULL_TREE);
9600 else if (TREE_CODE (type) == FUNCTION_TYPE
9601 || TREE_CODE (type) == METHOD_TYPE)
9606 if (!unqualified_id)
9607 return error_mark_node;
9609 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9610 original_name = dname;
9612 original_name = unqualified_id;
9614 if (storage_class == sc_auto)
9615 error ("storage class %<auto%> invalid for function %qs", name);
9616 else if (storage_class == sc_register)
9617 error ("storage class %<register%> invalid for function %qs", name);
9619 error ("storage class %<__thread%> invalid for function %qs", name);
9621 /* Function declaration not at top level.
9622 Storage classes other than `extern' are not allowed
9623 and `extern' makes no difference. */
9624 if (! toplevel_bindings_p ()
9625 && (storage_class == sc_static
9626 || declspecs->specs[(int)ds_inline])
9629 if (storage_class == sc_static)
9630 pedwarn (input_location, OPT_pedantic,
9631 "%<static%> specified invalid for function %qs "
9632 "declared out of global scope", name);
9634 pedwarn (input_location, OPT_pedantic,
9635 "%<inline%> specifier invalid for function %qs "
9636 "declared out of global scope", name);
9639 if (ctype != NULL_TREE
9640 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9642 error ("%q#T is not a class or a namespace", ctype);
9646 if (ctype == NULL_TREE)
9650 error ("virtual non-class function %qs", name);
9653 else if (sfk == sfk_constructor
9654 || sfk == sfk_destructor)
9657 ? "%qs defined in a non-class scope"
9658 : "%qs declared in a non-class scope", name);
9662 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9663 && !NEW_DELETE_OPNAME_P (original_name))
9664 type = build_method_type_directly (ctype,
9666 TYPE_ARG_TYPES (type));
9668 /* Record presence of `static'. */
9669 publicp = (ctype != NULL_TREE
9670 || storage_class == sc_extern
9671 || storage_class != sc_static);
9673 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9674 virtualp, flags, memfn_quals, raises,
9676 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9677 template_count, in_namespace, attrlist,
9678 declarator->id_loc);
9679 if (decl == NULL_TREE)
9680 return error_mark_node;
9684 int invalid_static = 0;
9686 /* Don't allow a static member function in a class, and forbid
9687 declaring main to be static. */
9688 if (TREE_CODE (type) == METHOD_TYPE)
9690 permerror (input_location, "cannot declare member function %qD to have "
9691 "static linkage", decl);
9694 else if (current_function_decl)
9696 /* FIXME need arm citation */
9697 error ("cannot declare static function inside another function");
9704 storage_class = sc_none;
9710 /* It's a variable. */
9712 /* An uninitialized decl with `extern' is a reference. */
9713 decl = grokvardecl (type, unqualified_id,
9716 (type_quals & TYPE_QUAL_CONST) != 0,
9717 ctype ? ctype : in_namespace);
9718 bad_specifiers (decl, "variable", virtualp,
9719 memfn_quals != TYPE_UNQUALIFIED,
9720 inlinep, friendp, raises != NULL_TREE);
9724 DECL_CONTEXT (decl) = ctype;
9727 permerror (input_location, "%<static%> may not be used when defining "
9728 "(as opposed to declaring) a static data member");
9730 storage_class = sc_none;
9732 if (storage_class == sc_register && TREE_STATIC (decl))
9734 error ("static member %qD declared %<register%>", decl);
9735 storage_class = sc_none;
9737 if (storage_class == sc_extern && pedantic)
9739 pedwarn (input_location, OPT_pedantic,
9740 "cannot explicitly declare member %q#D to have "
9741 "extern linkage", decl);
9742 storage_class = sc_none;
9747 if (storage_class == sc_extern && initialized && !funcdef_flag)
9749 if (toplevel_bindings_p ())
9751 /* It's common practice (and completely valid) to have a const
9752 be initialized and declared extern. */
9753 if (!(type_quals & TYPE_QUAL_CONST))
9754 warning (0, "%qs initialized and declared %<extern%>", name);
9758 error ("%qs has both %<extern%> and initializer", name);
9759 return error_mark_node;
9763 /* Record `register' declaration for warnings on &
9764 and in case doing stupid register allocation. */
9766 if (storage_class == sc_register)
9767 DECL_REGISTER (decl) = 1;
9768 else if (storage_class == sc_extern)
9769 DECL_THIS_EXTERN (decl) = 1;
9770 else if (storage_class == sc_static)
9771 DECL_THIS_STATIC (decl) = 1;
9773 /* Don't forget constexprness. */
9774 if (VAR_OR_FUNCTION_DECL_P (decl))
9775 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9777 /* Record constancy and volatility on the DECL itself . There's
9778 no need to do this when processing a template; we'll do this
9779 for the instantiated declaration based on the type of DECL. */
9780 if (!processing_template_decl)
9781 cp_apply_type_quals_to_decl (type_quals, decl);
9787 /* Subroutine of start_function. Ensure that each of the parameter
9788 types (as listed in PARMS) is complete, as is required for a
9789 function definition. */
9792 require_complete_types_for_parms (tree parms)
9794 for (; parms; parms = TREE_CHAIN (parms))
9796 if (dependent_type_p (TREE_TYPE (parms)))
9798 if (!VOID_TYPE_P (TREE_TYPE (parms))
9799 && complete_type_or_else (TREE_TYPE (parms), parms))
9801 relayout_decl (parms);
9802 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9805 /* grokparms or complete_type_or_else will have already issued
9807 TREE_TYPE (parms) = error_mark_node;
9811 /* Returns nonzero if T is a local variable. */
9814 local_variable_p (const_tree t)
9816 if ((TREE_CODE (t) == VAR_DECL
9817 /* A VAR_DECL with a context that is a _TYPE is a static data
9819 && !TYPE_P (CP_DECL_CONTEXT (t))
9820 /* Any other non-local variable must be at namespace scope. */
9821 && !DECL_NAMESPACE_SCOPE_P (t))
9822 || (TREE_CODE (t) == PARM_DECL))
9828 /* Like local_variable_p, but suitable for use as a tree-walking
9832 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9833 void *data ATTRIBUTE_UNUSED)
9835 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9837 else if (TYPE_P (*tp))
9844 /* Check that ARG, which is a default-argument expression for a
9845 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9846 something goes wrong. DECL may also be a _TYPE node, rather than a
9847 DECL, if there is no DECL available. */
9850 check_default_argument (tree decl, tree arg)
9855 if (TREE_CODE (arg) == DEFAULT_ARG)
9856 /* We get a DEFAULT_ARG when looking at an in-class declaration
9857 with a default argument. Ignore the argument for now; we'll
9858 deal with it after the class is complete. */
9867 decl_type = TREE_TYPE (decl);
9869 if (arg == error_mark_node
9870 || decl == error_mark_node
9871 || TREE_TYPE (arg) == error_mark_node
9872 || decl_type == error_mark_node)
9873 /* Something already went wrong. There's no need to check
9875 return error_mark_node;
9877 /* [dcl.fct.default]
9879 A default argument expression is implicitly converted to the
9881 if (!TREE_TYPE (arg)
9882 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9885 error ("default argument for %q#D has type %qT",
9886 decl, TREE_TYPE (arg));
9888 error ("default argument for parameter of type %qT has type %qT",
9889 decl_type, TREE_TYPE (arg));
9891 return error_mark_node;
9894 /* [dcl.fct.default]
9896 Local variables shall not be used in default argument
9899 The keyword `this' shall not be used in a default argument of a
9901 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9904 error ("default argument %qE uses local variable %qD", arg, var);
9905 return error_mark_node;
9912 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9915 type_is_deprecated (tree type)
9917 enum tree_code code;
9918 if (TREE_DEPRECATED (type))
9920 if (TYPE_NAME (type)
9921 && TREE_DEPRECATED (TYPE_NAME (type)))
9924 /* Do warn about using typedefs to a deprecated class. */
9925 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
9926 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
9928 code = TREE_CODE (type);
9930 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9931 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9932 || code == METHOD_TYPE || code == ARRAY_TYPE)
9933 return type_is_deprecated (TREE_TYPE (type));
9935 if (TYPE_PTRMEMFUNC_P (type))
9936 return type_is_deprecated
9937 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9942 /* Decode the list of parameter types for a function type.
9943 Given the list of things declared inside the parens,
9944 return a list of types.
9946 If this parameter does not end with an ellipsis, we append
9949 *PARMS is set to the chain of PARM_DECLs created. */
9952 grokparms (tree parmlist, tree *parms)
9954 tree result = NULL_TREE;
9955 tree decls = NULL_TREE;
9959 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9961 tree type = NULL_TREE;
9962 tree init = TREE_PURPOSE (parm);
9963 tree decl = TREE_VALUE (parm);
9966 if (parm == void_list_node)
9969 if (! decl || TREE_TYPE (decl) == error_mark_node)
9972 type = TREE_TYPE (decl);
9973 if (VOID_TYPE_P (type))
9975 if (same_type_p (type, void_type_node)
9976 && DECL_SELF_REFERENCE_P (type)
9977 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9978 /* this is a parmlist of `(void)', which is ok. */
9980 cxx_incomplete_type_error (decl, type);
9981 /* It's not a good idea to actually create parameters of
9982 type `void'; other parts of the compiler assume that a
9983 void type terminates the parameter list. */
9984 type = error_mark_node;
9985 TREE_TYPE (decl) = error_mark_node;
9988 if (type != error_mark_node
9989 && TYPE_FOR_JAVA (type)
9990 && MAYBE_CLASS_TYPE_P (type))
9992 error ("parameter %qD has Java class type", decl);
9993 type = error_mark_node;
9994 TREE_TYPE (decl) = error_mark_node;
9998 if (type != error_mark_node
9999 && (errmsg = targetm.invalid_parameter_type (type)))
10002 type = error_mark_node;
10003 TREE_TYPE (decl) = error_mark_node;
10006 if (type != error_mark_node)
10008 if (deprecated_state != DEPRECATED_SUPPRESS)
10010 tree deptype = type_is_deprecated (type);
10012 warn_deprecated_use (deptype, NULL_TREE);
10015 /* Top-level qualifiers on the parameters are
10016 ignored for function types. */
10017 type = cp_build_qualified_type (type, 0);
10018 if (TREE_CODE (type) == METHOD_TYPE)
10020 error ("parameter %qD invalidly declared method type", decl);
10021 type = build_pointer_type (type);
10022 TREE_TYPE (decl) = type;
10024 else if (abstract_virtuals_error (decl, type))
10025 any_error = 1; /* Seems like a good idea. */
10026 else if (POINTER_TYPE_P (type))
10028 /* [dcl.fct]/6, parameter types cannot contain pointers
10029 (references) to arrays of unknown bound. */
10030 tree t = TREE_TYPE (type);
10031 int ptr = TYPE_PTR_P (type);
10035 if (TYPE_PTR_P (t))
10037 else if (TREE_CODE (t) != ARRAY_TYPE)
10039 else if (!TYPE_DOMAIN (t))
10043 if (TREE_CODE (t) == ARRAY_TYPE)
10045 ? G_("parameter %qD includes pointer to array of "
10046 "unknown bound %qT")
10047 : G_("parameter %qD includes reference to array of "
10048 "unknown bound %qT"),
10054 else if (init && !processing_template_decl)
10055 init = check_default_argument (decl, init);
10058 if (TREE_CODE (decl) == PARM_DECL
10059 && FUNCTION_PARAMETER_PACK_P (decl)
10060 && TREE_CHAIN (parm)
10061 && TREE_CHAIN (parm) != void_list_node)
10062 error ("parameter packs must be at the end of the parameter list");
10064 TREE_CHAIN (decl) = decls;
10066 result = tree_cons (init, type, result);
10068 decls = nreverse (decls);
10069 result = nreverse (result);
10071 result = chainon (result, void_list_node);
10078 /* D is a constructor or overloaded `operator='.
10080 Let T be the class in which D is declared. Then, this function
10083 -1 if D's is an ill-formed constructor or copy assignment operator
10084 whose first parameter is of type `T'.
10085 0 if D is not a copy constructor or copy assignment
10087 1 if D is a copy constructor or copy assignment operator whose
10088 first parameter is a reference to non-const qualified T.
10089 2 if D is a copy constructor or copy assignment operator whose
10090 first parameter is a reference to const qualified T.
10092 This function can be used as a predicate. Positive values indicate
10093 a copy constructor and nonzero values indicate a copy assignment
10097 copy_fn_p (const_tree d)
10103 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10105 if (TREE_CODE (d) == TEMPLATE_DECL
10106 || (DECL_TEMPLATE_INFO (d)
10107 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10108 /* Instantiations of template member functions are never copy
10109 functions. Note that member functions of templated classes are
10110 represented as template functions internally, and we must
10111 accept those as copy functions. */
10114 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10118 arg_type = TREE_VALUE (args);
10119 if (arg_type == error_mark_node)
10122 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10124 /* Pass by value copy assignment operator. */
10127 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10128 && !TYPE_REF_IS_RVALUE (arg_type)
10129 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10131 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10137 args = TREE_CHAIN (args);
10139 if (args && args != void_list_node && !TREE_PURPOSE (args))
10140 /* There are more non-optional args. */
10146 /* D is a constructor or overloaded `operator='.
10148 Let T be the class in which D is declared. Then, this function
10149 returns true when D is a move constructor or move assignment
10150 operator, false otherwise. */
10153 move_fn_p (const_tree d)
10157 bool result = false;
10159 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10161 if (cxx_dialect == cxx98)
10162 /* There are no move constructors if we are in C++98 mode. */
10165 if (TREE_CODE (d) == TEMPLATE_DECL
10166 || (DECL_TEMPLATE_INFO (d)
10167 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10168 /* Instantiations of template member functions are never copy
10169 functions. Note that member functions of templated classes are
10170 represented as template functions internally, and we must
10171 accept those as copy functions. */
10174 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10178 arg_type = TREE_VALUE (args);
10179 if (arg_type == error_mark_node)
10182 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10183 && TYPE_REF_IS_RVALUE (arg_type)
10184 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10188 args = TREE_CHAIN (args);
10190 if (args && args != void_list_node && !TREE_PURPOSE (args))
10191 /* There are more non-optional args. */
10197 /* Remember any special properties of member function DECL. */
10200 grok_special_member_properties (tree decl)
10204 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10207 class_type = DECL_CONTEXT (decl);
10208 if (DECL_CONSTRUCTOR_P (decl))
10210 int ctor = copy_fn_p (decl);
10212 if (!DECL_ARTIFICIAL (decl))
10213 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10219 A non-template constructor for class X is a copy
10220 constructor if its first parameter is of type X&, const
10221 X&, volatile X& or const volatile X&, and either there
10222 are no other parameters or else all other parameters have
10223 default arguments. */
10224 TYPE_HAS_INIT_REF (class_type) = 1;
10225 if (user_provided_p (decl))
10226 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
10228 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
10230 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10232 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10233 if (user_provided_p (decl))
10234 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10236 else if (is_list_ctor (decl))
10237 TYPE_HAS_LIST_CTOR (class_type) = 1;
10239 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10243 A non-template assignment operator for class X is a copy
10244 assignment operator if its parameter is of type X, X&, const
10245 X&, volatile X& or const volatile X&. */
10247 int assop = copy_fn_p (decl);
10251 TYPE_HAS_ASSIGN_REF (class_type) = 1;
10252 if (user_provided_p (decl))
10253 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
10255 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
10260 /* Check a constructor DECL has the correct form. Complains
10261 if the class has a constructor of the form X(X). */
10264 grok_ctor_properties (const_tree ctype, const_tree decl)
10266 int ctor_parm = copy_fn_p (decl);
10272 A declaration of a constructor for a class X is ill-formed if
10273 its first parameter is of type (optionally cv-qualified) X
10274 and either there are no other parameters or else all other
10275 parameters have default arguments.
10277 We *don't* complain about member template instantiations that
10278 have this form, though; they can occur as we try to decide
10279 what constructor to use during overload resolution. Since
10280 overload resolution will never prefer such a constructor to
10281 the non-template copy constructor (which is either explicitly
10282 or implicitly defined), there's no need to worry about their
10283 existence. Theoretically, they should never even be
10284 instantiated, but that's hard to forestall. */
10285 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10293 /* An operator with this code is unary, but can also be binary. */
10296 ambi_op_p (enum tree_code code)
10298 return (code == INDIRECT_REF
10299 || code == ADDR_EXPR
10300 || code == UNARY_PLUS_EXPR
10301 || code == NEGATE_EXPR
10302 || code == PREINCREMENT_EXPR
10303 || code == PREDECREMENT_EXPR);
10306 /* An operator with this name can only be unary. */
10309 unary_op_p (enum tree_code code)
10311 return (code == TRUTH_NOT_EXPR
10312 || code == BIT_NOT_EXPR
10313 || code == COMPONENT_REF
10314 || code == TYPE_EXPR);
10317 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10318 errors are issued for invalid declarations. */
10321 grok_op_properties (tree decl, bool complain)
10323 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10325 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10326 tree name = DECL_NAME (decl);
10327 enum tree_code operator_code;
10332 /* Count the number of arguments and check for ellipsis. */
10333 for (argtype = argtypes, arity = 0;
10334 argtype && argtype != void_list_node;
10335 argtype = TREE_CHAIN (argtype))
10337 ellipsis_p = !argtype;
10339 class_type = DECL_CONTEXT (decl);
10340 if (class_type && !CLASS_TYPE_P (class_type))
10341 class_type = NULL_TREE;
10343 if (DECL_CONV_FN_P (decl))
10344 operator_code = TYPE_EXPR;
10348 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10349 if (ansi_opname (CODE) == name) \
10351 operator_code = (CODE); \
10354 else if (ansi_assopname (CODE) == name) \
10356 operator_code = (CODE); \
10357 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10361 #include "operators.def"
10362 #undef DEF_OPERATOR
10364 gcc_unreachable ();
10367 gcc_assert (operator_code != MAX_TREE_CODES);
10368 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10371 switch (operator_code)
10374 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10378 TYPE_GETS_DELETE (class_type) |= 1;
10382 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10385 case VEC_DELETE_EXPR:
10386 TYPE_GETS_DELETE (class_type) |= 2;
10393 /* [basic.std.dynamic.allocation]/1:
10395 A program is ill-formed if an allocation function is declared
10396 in a namespace scope other than global scope or declared static
10399 The same also holds true for deallocation functions. */
10400 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10401 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10403 if (DECL_NAMESPACE_SCOPE_P (decl))
10405 if (CP_DECL_CONTEXT (decl) != global_namespace)
10407 error ("%qD may not be declared within a namespace", decl);
10410 else if (!TREE_PUBLIC (decl))
10412 error ("%qD may not be declared as static", decl);
10418 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10420 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10421 DECL_IS_OPERATOR_NEW (decl) = 1;
10423 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10424 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10427 /* An operator function must either be a non-static member function
10428 or have at least one parameter of a class, a reference to a class,
10429 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10430 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10432 if (operator_code == TYPE_EXPR
10433 || operator_code == CALL_EXPR
10434 || operator_code == COMPONENT_REF
10435 || operator_code == ARRAY_REF
10436 || operator_code == NOP_EXPR)
10438 error ("%qD must be a nonstatic member function", decl);
10445 if (DECL_STATIC_FUNCTION_P (decl))
10447 error ("%qD must be either a non-static member "
10448 "function or a non-member function", decl);
10452 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10454 tree arg = non_reference (TREE_VALUE (p));
10455 if (arg == error_mark_node)
10458 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10459 because these checks are performed even on
10460 template functions. */
10461 if (MAYBE_CLASS_TYPE_P (arg)
10462 || TREE_CODE (arg) == ENUMERAL_TYPE)
10466 if (!p || p == void_list_node)
10469 error ("%qD must have an argument of class or "
10470 "enumerated type", decl);
10476 /* There are no restrictions on the arguments to an overloaded
10478 if (operator_code == CALL_EXPR)
10481 /* Warn about conversion operators that will never be used. */
10482 if (IDENTIFIER_TYPENAME_P (name)
10483 && ! DECL_TEMPLATE_INFO (decl)
10485 /* Warn only declaring the function; there is no need to
10486 warn again about out-of-class definitions. */
10487 && class_type == current_class_type)
10489 tree t = TREE_TYPE (name);
10490 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10493 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10495 if (TREE_CODE (t) == VOID_TYPE)
10496 warning (OPT_Wconversion,
10498 ? G_("conversion to a reference to void "
10499 "will never use a type conversion operator")
10500 : G_("conversion to void "
10501 "will never use a type conversion operator"));
10502 else if (class_type)
10504 if (t == class_type)
10505 warning (OPT_Wconversion,
10507 ? G_("conversion to a reference to the same type "
10508 "will never use a type conversion operator")
10509 : G_("conversion to the same type "
10510 "will never use a type conversion operator"));
10511 /* Don't force t to be complete here. */
10512 else if (MAYBE_CLASS_TYPE_P (t)
10513 && COMPLETE_TYPE_P (t)
10514 && DERIVED_FROM_P (t, class_type))
10515 warning (OPT_Wconversion,
10517 ? G_("conversion to a reference to a base class "
10518 "will never use a type conversion operator")
10519 : G_("conversion to a base class "
10520 "will never use a type conversion operator"));
10525 if (operator_code == COND_EXPR)
10528 error ("ISO C++ prohibits overloading operator ?:");
10531 else if (ellipsis_p)
10533 error ("%qD must not have variable number of arguments", decl);
10536 else if (ambi_op_p (operator_code))
10539 /* We pick the one-argument operator codes by default, so
10540 we don't have to change anything. */
10542 else if (arity == 2)
10544 /* If we thought this was a unary operator, we now know
10545 it to be a binary operator. */
10546 switch (operator_code)
10549 operator_code = MULT_EXPR;
10553 operator_code = BIT_AND_EXPR;
10556 case UNARY_PLUS_EXPR:
10557 operator_code = PLUS_EXPR;
10561 operator_code = MINUS_EXPR;
10564 case PREINCREMENT_EXPR:
10565 operator_code = POSTINCREMENT_EXPR;
10568 case PREDECREMENT_EXPR:
10569 operator_code = POSTDECREMENT_EXPR;
10573 gcc_unreachable ();
10576 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10578 if ((operator_code == POSTINCREMENT_EXPR
10579 || operator_code == POSTDECREMENT_EXPR)
10580 && ! processing_template_decl
10581 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10584 error ("postfix %qD must take %<int%> as its argument",
10587 error ("postfix %qD must take %<int%> as its second "
10595 error ("%qD must take either zero or one argument", decl);
10597 error ("%qD must take either one or two arguments", decl);
10601 /* More Effective C++ rule 6. */
10603 && (operator_code == POSTINCREMENT_EXPR
10604 || operator_code == POSTDECREMENT_EXPR
10605 || operator_code == PREINCREMENT_EXPR
10606 || operator_code == PREDECREMENT_EXPR))
10608 tree arg = TREE_VALUE (argtypes);
10609 tree ret = TREE_TYPE (TREE_TYPE (decl));
10610 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10611 arg = TREE_TYPE (arg);
10612 arg = TYPE_MAIN_VARIANT (arg);
10613 if (operator_code == PREINCREMENT_EXPR
10614 || operator_code == PREDECREMENT_EXPR)
10616 if (TREE_CODE (ret) != REFERENCE_TYPE
10617 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10619 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10620 build_reference_type (arg));
10624 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10625 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10629 else if (unary_op_p (operator_code))
10634 error ("%qD must take %<void%>", decl);
10636 error ("%qD must take exactly one argument", decl);
10640 else /* if (binary_op_p (operator_code)) */
10645 error ("%qD must take exactly one argument", decl);
10647 error ("%qD must take exactly two arguments", decl);
10651 /* More Effective C++ rule 7. */
10653 && (operator_code == TRUTH_ANDIF_EXPR
10654 || operator_code == TRUTH_ORIF_EXPR
10655 || operator_code == COMPOUND_EXPR))
10656 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10660 /* Effective C++ rule 23. */
10663 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10664 && (operator_code == PLUS_EXPR
10665 || operator_code == MINUS_EXPR
10666 || operator_code == TRUNC_DIV_EXPR
10667 || operator_code == MULT_EXPR
10668 || operator_code == TRUNC_MOD_EXPR)
10669 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10670 warning (OPT_Weffc__, "%qD should return by value", decl);
10672 /* [over.oper]/8 */
10673 for (; argtypes && argtypes != void_list_node;
10674 argtypes = TREE_CHAIN (argtypes))
10675 if (TREE_PURPOSE (argtypes))
10677 TREE_PURPOSE (argtypes) = NULL_TREE;
10678 if (operator_code == POSTINCREMENT_EXPR
10679 || operator_code == POSTDECREMENT_EXPR)
10681 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10686 error ("%qD cannot have default arguments", decl);
10694 /* Return a string giving the keyword associate with CODE. */
10696 static const char *
10697 tag_name (enum tag_types code)
10709 case typename_type:
10712 gcc_unreachable ();
10716 /* Name lookup in an elaborated-type-specifier (after the keyword
10717 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10718 elaborated-type-specifier is invalid, issue a diagnostic and return
10719 error_mark_node; otherwise, return the *_TYPE to which it referred.
10720 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10723 check_elaborated_type_specifier (enum tag_types tag_code,
10725 bool allow_template_p)
10731 struct S { struct S *p; };
10733 name lookup will find the TYPE_DECL for the implicit "S::S"
10734 typedef. Adjust for that here. */
10735 if (DECL_SELF_REFERENCE_P (decl))
10736 decl = TYPE_NAME (TREE_TYPE (decl));
10738 type = TREE_TYPE (decl);
10740 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10741 is false for this case as well. */
10742 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10744 error ("using template type parameter %qT after %qs",
10745 type, tag_name (tag_code));
10746 return error_mark_node;
10750 If the identifier resolves to a typedef-name or a template
10751 type-parameter, the elaborated-type-specifier is ill-formed.
10753 In other words, the only legitimate declaration to use in the
10754 elaborated type specifier is the implicit typedef created when
10755 the type is declared. */
10756 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10757 && !DECL_SELF_REFERENCE_P (decl)
10758 && tag_code != typename_type)
10760 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10761 error ("%q+D has a previous declaration here", decl);
10762 return error_mark_node;
10764 else if (TREE_CODE (type) != RECORD_TYPE
10765 && TREE_CODE (type) != UNION_TYPE
10766 && tag_code != enum_type
10767 && tag_code != typename_type)
10769 error ("%qT referred to as %qs", type, tag_name (tag_code));
10770 error ("%q+T has a previous declaration here", type);
10771 return error_mark_node;
10773 else if (TREE_CODE (type) != ENUMERAL_TYPE
10774 && tag_code == enum_type)
10776 error ("%qT referred to as enum", type);
10777 error ("%q+T has a previous declaration here", type);
10778 return error_mark_node;
10780 else if (!allow_template_p
10781 && TREE_CODE (type) == RECORD_TYPE
10782 && CLASSTYPE_IS_TEMPLATE (type))
10784 /* If a class template appears as elaborated type specifier
10785 without a template header such as:
10787 template <class T> class C {};
10788 void f(class C); // No template header here
10790 then the required template argument is missing. */
10791 error ("template argument required for %<%s %T%>",
10792 tag_name (tag_code),
10793 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10794 return error_mark_node;
10800 /* Lookup NAME in elaborate type specifier in scope according to
10801 SCOPE and issue diagnostics if necessary.
10802 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10803 found, and ERROR_MARK_NODE for type error. */
10806 lookup_and_check_tag (enum tag_types tag_code, tree name,
10807 tag_scope scope, bool template_header_p)
10811 if (scope == ts_global)
10813 /* First try ordinary name lookup, ignoring hidden class name
10814 injected via friend declaration. */
10815 decl = lookup_name_prefer_type (name, 2);
10816 /* If that fails, the name will be placed in the smallest
10817 non-class, non-function-prototype scope according to 3.3.1/5.
10818 We may already have a hidden name declared as friend in this
10819 scope. So lookup again but not ignoring hidden names.
10820 If we find one, that name will be made visible rather than
10821 creating a new tag. */
10823 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10826 decl = lookup_type_scope (name, scope);
10828 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10829 decl = DECL_TEMPLATE_RESULT (decl);
10831 if (decl && TREE_CODE (decl) == TYPE_DECL)
10833 /* Look for invalid nested type:
10837 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10839 error ("%qD has the same name as the class in which it is "
10842 return error_mark_node;
10845 /* Two cases we need to consider when deciding if a class
10846 template is allowed as an elaborated type specifier:
10847 1. It is a self reference to its own class.
10848 2. It comes with a template header.
10852 template <class T> class C {
10853 class C *c1; // DECL_SELF_REFERENCE_P is true
10856 template <class U> class C; // template_header_p is true
10857 template <class T> class C<T>::D {
10858 class C *c2; // DECL_SELF_REFERENCE_P is true
10861 t = check_elaborated_type_specifier (tag_code,
10864 | DECL_SELF_REFERENCE_P (decl));
10867 else if (decl && TREE_CODE (decl) == TREE_LIST)
10869 error ("reference to %qD is ambiguous", name);
10870 print_candidates (decl);
10871 return error_mark_node;
10877 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10878 Define the tag as a forward-reference if it is not defined.
10880 If a declaration is given, process it here, and report an error if
10881 multiple declarations are not identical.
10883 SCOPE is TS_CURRENT when this is also a definition. Only look in
10884 the current frame for the name (since C++ allows new names in any
10885 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10886 declaration. Only look beginning from the current scope outward up
10887 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10889 TEMPLATE_HEADER_P is true when this declaration is preceded by
10890 a set of template parameters. */
10893 xref_tag (enum tag_types tag_code, tree name,
10894 tag_scope scope, bool template_header_p)
10896 enum tree_code code;
10898 tree context = NULL_TREE;
10900 timevar_push (TV_NAME_LOOKUP);
10902 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10908 code = RECORD_TYPE;
10914 code = ENUMERAL_TYPE;
10917 gcc_unreachable ();
10920 /* In case of anonymous name, xref_tag is only called to
10921 make type node and push name. Name lookup is not required. */
10922 if (ANON_AGGRNAME_P (name))
10925 t = lookup_and_check_tag (tag_code, name,
10926 scope, template_header_p);
10928 if (t == error_mark_node)
10929 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10931 if (scope != ts_current && t && current_class_type
10932 && template_class_depth (current_class_type)
10933 && template_header_p)
10935 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10936 definition of this tag. Since, in addition, we are currently
10937 processing a (member) template declaration of a template
10938 class, we must be very careful; consider:
10945 { template <class V>
10946 friend struct S1; };
10948 Here, the S2::S1 declaration should not be confused with the
10949 outer declaration. In particular, the inner version should
10950 have a template parameter of level 2, not level 1. This
10951 would be particularly important if the member declaration
10954 template <class V = U> friend struct S1;
10956 say, when we should tsubst into `U' when instantiating
10957 S2. On the other hand, when presented with:
10967 we must find the inner binding eventually. We
10968 accomplish this by making sure that the new type we
10969 create to represent this declaration has the right
10971 context = TYPE_CONTEXT (t);
10977 /* If no such tag is yet defined, create a forward-reference node
10978 and record it as the "definition".
10979 When a real declaration of this type is found,
10980 the forward-reference will be altered into a real type. */
10981 if (code == ENUMERAL_TYPE)
10983 error ("use of enum %q#D without previous declaration", name);
10984 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10988 t = make_class_type (code);
10989 TYPE_CONTEXT (t) = context;
10990 t = pushtag (name, t, scope);
10995 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10997 if (!redeclare_class_template (t, current_template_parms))
10998 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11000 else if (!processing_template_decl
11001 && CLASS_TYPE_P (t)
11002 && CLASSTYPE_IS_TEMPLATE (t))
11004 error ("redeclaration of %qT as a non-template", t);
11005 error ("previous declaration %q+D", t);
11006 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11009 /* Make injected friend class visible. */
11010 if (scope != ts_within_enclosing_non_class
11011 && hidden_name_p (TYPE_NAME (t)))
11013 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11014 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11016 if (TYPE_TEMPLATE_INFO (t))
11018 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11019 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11024 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11028 xref_tag_from_type (tree old, tree id, tag_scope scope)
11030 enum tag_types tag_kind;
11032 if (TREE_CODE (old) == RECORD_TYPE)
11033 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11035 tag_kind = union_type;
11037 if (id == NULL_TREE)
11038 id = TYPE_IDENTIFIER (old);
11040 return xref_tag (tag_kind, id, scope, false);
11043 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11044 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11045 access_* node, and the TREE_VALUE is the type of the base-class.
11046 Non-NULL TREE_TYPE indicates virtual inheritance.
11048 Returns true if the binfo hierarchy was successfully created,
11049 false if an error was detected. */
11052 xref_basetypes (tree ref, tree base_list)
11055 tree binfo, base_binfo;
11056 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11057 unsigned max_bases = 0; /* Maximum direct bases. */
11059 tree default_access;
11060 tree igo_prev; /* Track Inheritance Graph Order. */
11062 if (ref == error_mark_node)
11065 /* The base of a derived class is private by default, all others are
11067 default_access = (TREE_CODE (ref) == RECORD_TYPE
11068 && CLASSTYPE_DECLARED_CLASS (ref)
11069 ? access_private_node : access_public_node);
11071 /* First, make sure that any templates in base-classes are
11072 instantiated. This ensures that if we call ourselves recursively
11073 we do not get confused about which classes are marked and which
11075 basep = &base_list;
11078 tree basetype = TREE_VALUE (*basep);
11080 if (!(processing_template_decl && uses_template_parms (basetype))
11081 && !complete_type_or_else (basetype, NULL))
11082 /* An incomplete type. Remove it from the list. */
11083 *basep = TREE_CHAIN (*basep);
11087 if (TREE_TYPE (*basep))
11089 if (CLASS_TYPE_P (basetype))
11090 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11091 basep = &TREE_CHAIN (*basep);
11095 TYPE_MARKED_P (ref) = 1;
11097 /* The binfo slot should be empty, unless this is an (ill-formed)
11099 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11101 error ("redefinition of %q#T", ref);
11105 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11107 binfo = make_tree_binfo (max_bases);
11109 TYPE_BINFO (ref) = binfo;
11110 BINFO_OFFSET (binfo) = size_zero_node;
11111 BINFO_TYPE (binfo) = ref;
11113 /* Apply base-class info set up to the variants of this type. */
11114 fixup_type_variants (ref);
11118 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11119 /* An aggregate cannot have baseclasses. */
11120 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11122 if (TREE_CODE (ref) == UNION_TYPE)
11124 error ("derived union %qT invalid", ref);
11131 if (TYPE_FOR_JAVA (ref))
11133 error ("Java class %qT cannot have multiple bases", ref);
11140 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11142 if (TYPE_FOR_JAVA (ref))
11144 error ("Java class %qT cannot have virtual bases", ref);
11149 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11151 tree access = TREE_PURPOSE (base_list);
11152 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11153 tree basetype = TREE_VALUE (base_list);
11155 if (access == access_default_node)
11156 access = default_access;
11158 if (PACK_EXPANSION_P (basetype))
11159 basetype = PACK_EXPANSION_PATTERN (basetype);
11160 if (TREE_CODE (basetype) == TYPE_DECL)
11161 basetype = TREE_TYPE (basetype);
11162 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11164 error ("base type %qT fails to be a struct or class type",
11169 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11170 TYPE_FOR_JAVA (ref) = 1;
11172 base_binfo = NULL_TREE;
11173 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11175 base_binfo = TYPE_BINFO (basetype);
11176 /* The original basetype could have been a typedef'd type. */
11177 basetype = BINFO_TYPE (base_binfo);
11179 /* Inherit flags from the base. */
11180 TYPE_HAS_NEW_OPERATOR (ref)
11181 |= TYPE_HAS_NEW_OPERATOR (basetype);
11182 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11183 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11184 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11185 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11186 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11187 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11188 CLASSTYPE_REPEATED_BASE_P (ref)
11189 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11192 /* We must do this test after we've seen through a typedef
11194 if (TYPE_MARKED_P (basetype))
11196 if (basetype == ref)
11197 error ("recursive type %qT undefined", basetype);
11199 error ("duplicate base type %qT invalid", basetype);
11203 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11204 /* Regenerate the pack expansion for the bases. */
11205 basetype = make_pack_expansion (basetype);
11207 TYPE_MARKED_P (basetype) = 1;
11209 base_binfo = copy_binfo (base_binfo, basetype, ref,
11210 &igo_prev, via_virtual);
11211 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11212 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11214 BINFO_BASE_APPEND (binfo, base_binfo);
11215 BINFO_BASE_ACCESS_APPEND (binfo, access);
11218 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11219 /* If we have space in the vbase vector, we must have shared at
11220 least one of them, and are therefore diamond shaped. */
11221 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11223 /* Unmark all the types. */
11224 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11225 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11226 TYPE_MARKED_P (ref) = 0;
11228 /* Now see if we have a repeated base type. */
11229 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11231 for (base_binfo = binfo; base_binfo;
11232 base_binfo = TREE_CHAIN (base_binfo))
11234 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11236 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11239 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11241 for (base_binfo = binfo; base_binfo;
11242 base_binfo = TREE_CHAIN (base_binfo))
11243 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11244 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11253 /* Begin compiling the definition of an enumeration type.
11256 UNDERLYING_TYPE is the type that will be used as the storage for
11257 the enumeration type. This should be NULL_TREE if no storage type
11260 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11262 Returns the type object, as yet incomplete.
11263 Also records info about it so that build_enumerator
11264 may be used to declare the individual values as they are read. */
11267 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
11271 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11273 /* If this is the real definition for a previous forward reference,
11274 fill in the contents in the same object that used to be the
11275 forward reference. */
11277 enumtype = lookup_and_check_tag (enum_type, name,
11278 /*tag_scope=*/ts_current,
11279 /*template_header_p=*/false);
11281 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11283 error_at (input_location, "multiple definition of %q#T", enumtype);
11284 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11285 "previous definition here");
11286 /* Clear out TYPE_VALUES, and start again. */
11287 TYPE_VALUES (enumtype) = NULL_TREE;
11291 /* In case of error, make a dummy enum to allow parsing to
11293 if (enumtype == error_mark_node)
11294 name = make_anon_name ();
11296 enumtype = cxx_make_type (ENUMERAL_TYPE);
11297 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11300 if (enumtype == error_mark_node)
11305 SET_SCOPED_ENUM_P (enumtype, 1);
11306 begin_scope (sk_scoped_enum, enumtype);
11308 /* [C++0x dcl.enum]p5:
11310 If not explicitly specified, the underlying type of a scoped
11311 enumeration type is int. */
11312 if (!underlying_type)
11313 underlying_type = integer_type_node;
11316 if (underlying_type)
11318 if (CP_INTEGRAL_TYPE_P (underlying_type))
11320 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11321 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11322 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11323 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11324 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11325 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11326 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11327 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11328 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11329 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11331 else if (!dependent_type_p (underlying_type))
11332 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11333 underlying_type, enumtype);
11339 /* After processing and defining all the values of an enumeration type,
11340 install their decls in the enumeration type and finish it off.
11341 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11344 finish_enum (tree enumtype)
11352 tree underlying_type = NULL_TREE;
11353 bool fixed_underlying_type_p
11354 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11356 /* We built up the VALUES in reverse order. */
11357 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11359 /* For an enum defined in a template, just set the type of the values;
11360 all further processing is postponed until the template is
11361 instantiated. We need to set the type so that tsubst of a CONST_DECL
11363 if (processing_template_decl)
11365 for (values = TYPE_VALUES (enumtype);
11367 values = TREE_CHAIN (values))
11368 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11369 if (at_function_scope_p ())
11370 add_stmt (build_min (TAG_DEFN, enumtype));
11371 if (SCOPED_ENUM_P (enumtype))
11376 /* Determine the minimum and maximum values of the enumerators. */
11377 if (TYPE_VALUES (enumtype))
11379 minnode = maxnode = NULL_TREE;
11381 for (values = TYPE_VALUES (enumtype);
11383 values = TREE_CHAIN (values))
11385 decl = TREE_VALUE (values);
11387 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11388 each enumerator has the type of its enumeration. Prior to the
11389 closing brace, the type of each enumerator is the type of its
11390 initializing value. */
11391 TREE_TYPE (decl) = enumtype;
11393 /* Update the minimum and maximum values, if appropriate. */
11394 value = DECL_INITIAL (decl);
11395 if (value == error_mark_node)
11396 value = integer_zero_node;
11397 /* Figure out what the minimum and maximum values of the
11398 enumerators are. */
11400 minnode = maxnode = value;
11401 else if (tree_int_cst_lt (maxnode, value))
11403 else if (tree_int_cst_lt (value, minnode))
11410 If the enumerator-list is empty, the underlying type is as if
11411 the enumeration had a single enumerator with value 0. */
11412 minnode = maxnode = integer_zero_node;
11414 if (!fixed_underlying_type_p)
11416 /* Compute the number of bits require to represent all values of the
11417 enumeration. We must do this before the type of MINNODE and
11418 MAXNODE are transformed, since tree_int_cst_min_precision relies
11419 on the TREE_TYPE of the value it is passed. */
11420 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11421 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11422 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11423 int precision = MAX (lowprec, highprec);
11425 bool use_short_enum;
11427 /* Determine the underlying type of the enumeration.
11431 The underlying type of an enumeration is an integral type that
11432 can represent all the enumerator values defined in the
11433 enumeration. It is implementation-defined which integral type is
11434 used as the underlying type for an enumeration except that the
11435 underlying type shall not be larger than int unless the value of
11436 an enumerator cannot fit in an int or unsigned int.
11438 We use "int" or an "unsigned int" as the underlying type, even if
11439 a smaller integral type would work, unless the user has
11440 explicitly requested that we use the smallest possible type. The
11441 user can request that for all enumerations with a command line
11442 flag, or for just one enumeration with an attribute. */
11444 use_short_enum = flag_short_enums
11445 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11447 for (itk = (use_short_enum ? itk_char : itk_int);
11451 underlying_type = integer_types[itk];
11452 if (underlying_type != NULL_TREE
11453 && TYPE_PRECISION (underlying_type) >= precision
11454 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11457 if (itk == itk_none)
11461 IF no integral type can represent all the enumerator values, the
11462 enumeration is ill-formed. */
11463 error ("no integral type can represent all of the enumerator values "
11464 "for %qT", enumtype);
11465 precision = TYPE_PRECISION (long_long_integer_type_node);
11466 underlying_type = integer_types[itk_unsigned_long_long];
11471 The value of sizeof() applied to an enumeration type, an object
11472 of an enumeration type, or an enumerator, is the value of sizeof()
11473 applied to the underlying type. */
11474 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11475 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11476 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11477 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11478 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11479 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11480 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11481 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11482 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11484 /* Compute the minimum and maximum values for the type.
11488 For an enumeration where emin is the smallest enumerator and emax
11489 is the largest, the values of the enumeration are the values of the
11490 underlying type in the range bmin to bmax, where bmin and bmax are,
11491 respectively, the smallest and largest values of the smallest bit-
11492 field that can store emin and emax. */
11494 /* The middle-end currently assumes that types with TYPE_PRECISION
11495 narrower than their underlying type are suitably zero or sign
11496 extended to fill their mode. Similarly, it assumes that the front
11497 end assures that a value of a particular type must be within
11498 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11500 We used to set these fields based on bmin and bmax, but that led
11501 to invalid assumptions like optimizing away bounds checking. So
11502 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11503 TYPE_MAX_VALUE to the values for the mode above and only restrict
11504 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11505 ENUM_UNDERLYING_TYPE (enumtype)
11506 = build_distinct_type_copy (underlying_type);
11507 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11508 set_min_and_max_values_for_integral_type
11509 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11511 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11512 if (flag_strict_enums)
11513 set_min_and_max_values_for_integral_type (enumtype, precision,
11517 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11519 /* Convert each of the enumerators to the type of the underlying
11520 type of the enumeration. */
11521 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11523 location_t saved_location;
11525 decl = TREE_VALUE (values);
11526 saved_location = input_location;
11527 input_location = DECL_SOURCE_LOCATION (decl);
11528 if (fixed_underlying_type_p)
11529 /* If the enumeration type has a fixed underlying type, we
11530 already checked all of the enumerator values. */
11531 value = DECL_INITIAL (decl);
11533 value = perform_implicit_conversion (underlying_type,
11534 DECL_INITIAL (decl),
11535 tf_warning_or_error);
11536 input_location = saved_location;
11538 /* Do not clobber shared ints. */
11539 value = copy_node (value);
11541 TREE_TYPE (value) = enumtype;
11542 DECL_INITIAL (decl) = value;
11545 /* Fix up all variant types of this enum type. */
11546 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11548 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11549 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11550 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11551 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11552 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11553 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11554 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11555 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11556 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11557 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11558 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11561 /* Finish up the scope of a scoped enumeration. */
11562 if (SCOPED_ENUM_P (enumtype))
11565 /* Finish debugging output for this type. */
11566 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11569 /* Build and install a CONST_DECL for an enumeration constant of the
11570 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11571 Assignment of sequential values by default is handled here. */
11574 build_enumerator (tree name, tree value, tree enumtype)
11580 /* If the VALUE was erroneous, pretend it wasn't there; that will
11581 result in the enum being assigned the next value in sequence. */
11582 if (value == error_mark_node)
11585 /* Remove no-op casts from the value. */
11587 STRIP_TYPE_NOPS (value);
11589 if (! processing_template_decl)
11591 /* Validate and default VALUE. */
11592 if (value != NULL_TREE)
11594 value = integral_constant_value (value);
11596 if (TREE_CODE (value) == INTEGER_CST)
11598 value = perform_integral_promotions (value);
11599 constant_expression_warning (value);
11603 error ("enumerator value for %qD is not an integer constant", name);
11608 /* Default based on previous value. */
11609 if (value == NULL_TREE)
11611 if (TYPE_VALUES (enumtype))
11614 unsigned HOST_WIDE_INT lo;
11618 /* The next value is the previous value plus one.
11619 add_double doesn't know the type of the target expression,
11620 so we must check with int_fits_type_p as well. */
11621 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11622 if (error_operand_p (prev_value))
11623 value = error_mark_node;
11626 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11627 TREE_INT_CST_HIGH (prev_value),
11629 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11631 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11635 error ("overflow in enumeration values at %qD", name);
11636 value = error_mark_node;
11641 value = integer_zero_node;
11644 /* Remove no-op casts from the value. */
11645 STRIP_TYPE_NOPS (value);
11647 /* If the underlying type of the enum is fixed, check whether
11648 the enumerator values fits in the underlying type. If it
11649 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11650 if (ENUM_UNDERLYING_TYPE (enumtype)
11652 && TREE_CODE (value) == INTEGER_CST
11653 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11655 error ("enumerator value %E is too large for underlying type %<%T%>",
11656 value, ENUM_UNDERLYING_TYPE (enumtype));
11658 /* Silently convert the value so that we can continue. */
11659 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11664 /* C++ associates enums with global, function, or class declarations. */
11665 context = current_scope ();
11667 /* Build the actual enumeration constant. Note that the enumeration
11668 constants have the underlying type of the enum (if it is fixed)
11669 or the type of their initializer (if the underlying type of the
11670 enum is not fixed):
11674 If the underlying type is fixed, the type of each enumerator
11675 prior to the closing brace is the underlying type; if the
11676 initializing value of an enumerator cannot be represented by
11677 the underlying type, the program is ill-formed. If the
11678 underlying type is not fixed, the type of each enumerator is
11679 the type of its initializing value.
11681 If the underlying type is not fixed, it will be computed by
11682 finish_enum and we will reset the type of this enumerator. Of
11683 course, if we're processing a template, there may be no value. */
11684 type = value ? TREE_TYPE (value) : NULL_TREE;
11686 if (context && context == current_class_type)
11687 /* This enum declaration is local to the class. We need the full
11688 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11689 decl = build_lang_decl (CONST_DECL, name, type);
11691 /* It's a global enum, or it's local to a function. (Note local to
11692 a function could mean local to a class method. */
11693 decl = build_decl (input_location, CONST_DECL, name, type);
11695 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11696 TREE_CONSTANT (decl) = 1;
11697 TREE_READONLY (decl) = 1;
11698 DECL_INITIAL (decl) = value;
11700 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11701 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11702 on the TYPE_FIELDS list for `S'. (That's so that you can say
11703 things like `S::i' later.) */
11704 finish_member_declaration (decl);
11708 /* Add this enumeration constant to the list for this type. */
11709 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11712 /* Look for an enumerator with the given NAME within the enumeration
11713 type ENUMTYPE. This routine is used primarily for qualified name
11714 lookup into an enumerator in C++0x, e.g.,
11716 enum class Color { Red, Green, Blue };
11718 Color color = Color::Red;
11720 Returns the value corresponding to the enumerator, or
11721 NULL_TREE if no such enumerator was found. */
11723 lookup_enumerator (tree enumtype, tree name)
11726 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11728 e = purpose_member (name, TYPE_VALUES (enumtype));
11729 return e? TREE_VALUE (e) : NULL_TREE;
11733 /* We're defining DECL. Make sure that its type is OK. */
11736 check_function_type (tree decl, tree current_function_parms)
11738 tree fntype = TREE_TYPE (decl);
11739 tree return_type = complete_type (TREE_TYPE (fntype));
11741 /* In a function definition, arg types must be complete. */
11742 require_complete_types_for_parms (current_function_parms);
11744 /* constexpr functions must have literal argument types and
11745 literal return type. */
11746 validate_constexpr_fundecl (decl);
11748 if (dependent_type_p (return_type))
11750 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11751 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11753 tree args = TYPE_ARG_TYPES (fntype);
11755 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11756 error ("return type %q#T is incomplete", return_type);
11758 error ("return type has Java class type %q#T", return_type);
11760 /* Make it return void instead. */
11761 if (TREE_CODE (fntype) == METHOD_TYPE)
11762 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11764 TREE_CHAIN (args));
11766 fntype = build_function_type (void_type_node, args);
11768 = build_exception_variant (fntype,
11769 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11770 fntype = (cp_build_type_attribute_variant
11771 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11772 TREE_TYPE (decl) = fntype;
11775 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11778 /* Create the FUNCTION_DECL for a function definition.
11779 DECLSPECS and DECLARATOR are the parts of the declaration;
11780 they describe the function's name and the type it returns,
11781 but twisted together in a fashion that parallels the syntax of C.
11783 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11784 DECLARATOR is really the DECL for the function we are about to
11785 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11786 indicating that the function is an inline defined in-class.
11788 This function creates a binding context for the function body
11789 as well as setting up the FUNCTION_DECL in current_function_decl.
11791 For C++, we must first check whether that datum makes any sense.
11792 For example, "class A local_a(1,2);" means that variable local_a
11793 is an aggregate of type A, which should have a constructor
11794 applied to it with the argument list [1, 2].
11796 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11797 or may be a BLOCK if the function has been defined previously
11798 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11799 error_mark_node if the function has never been defined, or
11800 a BLOCK if the function has been defined somewhere. */
11803 start_preparsed_function (tree decl1, tree attrs, int flags)
11805 tree ctype = NULL_TREE;
11808 int doing_friend = 0;
11809 struct cp_binding_level *bl;
11810 tree current_function_parms;
11811 struct c_fileinfo *finfo
11812 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11813 bool honor_interface;
11815 /* Sanity check. */
11816 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11817 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11819 fntype = TREE_TYPE (decl1);
11820 if (TREE_CODE (fntype) == METHOD_TYPE)
11821 ctype = TYPE_METHOD_BASETYPE (fntype);
11823 /* ISO C++ 11.4/5. A friend function defined in a class is in
11824 the (lexical) scope of the class in which it is defined. */
11825 if (!ctype && DECL_FRIEND_P (decl1))
11827 ctype = DECL_FRIEND_CONTEXT (decl1);
11829 /* CTYPE could be null here if we're dealing with a template;
11830 for example, `inline friend float foo()' inside a template
11831 will have no CTYPE set. */
11832 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11838 if (DECL_DECLARED_INLINE_P (decl1)
11839 && lookup_attribute ("noinline", attrs))
11840 warning (0, "inline function %q+D given attribute noinline", decl1);
11842 /* Handle gnu_inline attribute. */
11843 if (GNU_INLINE_P (decl1))
11845 DECL_EXTERNAL (decl1) = 1;
11846 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11847 DECL_INTERFACE_KNOWN (decl1) = 1;
11848 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11851 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11852 /* This is a constructor, we must ensure that any default args
11853 introduced by this definition are propagated to the clones
11854 now. The clones are used directly in overload resolution. */
11855 adjust_clone_args (decl1);
11857 /* Sometimes we don't notice that a function is a static member, and
11858 build a METHOD_TYPE for it. Fix that up now. */
11859 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11860 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11862 revert_static_member_fn (decl1);
11866 /* Set up current_class_type, and enter the scope of the class, if
11869 push_nested_class (ctype);
11870 else if (DECL_STATIC_FUNCTION_P (decl1))
11871 push_nested_class (DECL_CONTEXT (decl1));
11873 /* Now that we have entered the scope of the class, we must restore
11874 the bindings for any template parameters surrounding DECL1, if it
11875 is an inline member template. (Order is important; consider the
11876 case where a template parameter has the same name as a field of
11877 the class.) It is not until after this point that
11878 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11879 if (flags & SF_INCLASS_INLINE)
11880 maybe_begin_member_template_processing (decl1);
11882 /* Effective C++ rule 15. */
11884 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11885 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11886 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11888 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11889 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11890 if (!DECL_INITIAL (decl1))
11891 DECL_INITIAL (decl1) = error_mark_node;
11893 /* This function exists in static storage.
11894 (This does not mean `static' in the C sense!) */
11895 TREE_STATIC (decl1) = 1;
11897 /* We must call push_template_decl after current_class_type is set
11898 up. (If we are processing inline definitions after exiting a
11899 class scope, current_class_type will be NULL_TREE until set above
11900 by push_nested_class.) */
11901 if (processing_template_decl)
11903 /* FIXME: Handle error_mark_node more gracefully. */
11904 tree newdecl1 = push_template_decl (decl1);
11905 if (newdecl1 != error_mark_node)
11909 /* We are now in the scope of the function being defined. */
11910 current_function_decl = decl1;
11912 /* Save the parm names or decls from this function's declarator
11913 where store_parm_decls will find them. */
11914 current_function_parms = DECL_ARGUMENTS (decl1);
11916 /* Make sure the parameter and return types are reasonable. When
11917 you declare a function, these types can be incomplete, but they
11918 must be complete when you define the function. */
11919 check_function_type (decl1, current_function_parms);
11921 /* Build the return declaration for the function. */
11922 restype = TREE_TYPE (fntype);
11923 if (DECL_RESULT (decl1) == NULL_TREE)
11927 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11928 DECL_ARTIFICIAL (resdecl) = 1;
11929 DECL_IGNORED_P (resdecl) = 1;
11930 DECL_RESULT (decl1) = resdecl;
11932 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11935 /* Let the user know we're compiling this function. */
11936 announce_function (decl1);
11938 /* Record the decl so that the function name is defined.
11939 If we already have a decl for this name, and it is a FUNCTION_DECL,
11940 use the old decl. */
11941 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11943 /* A specialization is not used to guide overload resolution. */
11944 if (!DECL_FUNCTION_MEMBER_P (decl1)
11945 && !(DECL_USE_TEMPLATE (decl1) &&
11946 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11948 tree olddecl = pushdecl (decl1);
11950 if (olddecl == error_mark_node)
11951 /* If something went wrong when registering the declaration,
11952 use DECL1; we have to have a FUNCTION_DECL to use when
11953 parsing the body of the function. */
11957 /* Otherwise, OLDDECL is either a previous declaration
11958 of the same function or DECL1 itself. */
11960 if (warn_missing_declarations
11961 && olddecl == decl1
11962 && !DECL_MAIN_P (decl1)
11963 && TREE_PUBLIC (decl1)
11964 && !DECL_DECLARED_INLINE_P (decl1))
11968 /* Check whether DECL1 is in an anonymous
11970 for (context = DECL_CONTEXT (decl1);
11972 context = DECL_CONTEXT (context))
11974 if (TREE_CODE (context) == NAMESPACE_DECL
11975 && DECL_NAME (context) == NULL_TREE)
11979 if (context == NULL)
11980 warning (OPT_Wmissing_declarations,
11981 "no previous declaration for %q+D", decl1);
11989 /* We need to set the DECL_CONTEXT. */
11990 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11991 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11993 fntype = TREE_TYPE (decl1);
11995 /* If #pragma weak applies, mark the decl appropriately now.
11996 The pragma only applies to global functions. Because
11997 determining whether or not the #pragma applies involves
11998 computing the mangled name for the declaration, we cannot
11999 apply the pragma until after we have merged this declaration
12000 with any previous declarations; if the original declaration
12001 has a linkage specification, that specification applies to
12002 the definition as well, and may affect the mangled name. */
12003 if (!DECL_CONTEXT (decl1))
12004 maybe_apply_pragma_weak (decl1);
12007 /* Reset this in case the call to pushdecl changed it. */
12008 current_function_decl = decl1;
12010 gcc_assert (DECL_INITIAL (decl1));
12012 /* This function may already have been parsed, in which case just
12013 return; our caller will skip over the body without parsing. */
12014 if (DECL_INITIAL (decl1) != error_mark_node)
12017 /* Initialize RTL machinery. We cannot do this until
12018 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12019 even when processing a template; this is how we get
12020 CFUN set up, and our per-function variables initialized.
12021 FIXME factor out the non-RTL stuff. */
12022 bl = current_binding_level;
12023 allocate_struct_function (decl1, processing_template_decl);
12025 /* Initialize the language data structures. Whenever we start
12026 a new function, we destroy temporaries in the usual way. */
12027 cfun->language = ggc_alloc_cleared_language_function ();
12028 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12029 current_binding_level = bl;
12031 /* Even though we're inside a function body, we still don't want to
12032 call expand_expr to calculate the size of a variable-sized array.
12033 We haven't necessarily assigned RTL to all variables yet, so it's
12034 not safe to try to expand expressions involving them. */
12035 cfun->dont_save_pending_sizes_p = 1;
12037 /* Start the statement-tree, start the tree now. */
12038 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12040 /* If we are (erroneously) defining a function that we have already
12041 defined before, wipe out what we knew before. */
12042 if (!DECL_PENDING_INLINE_P (decl1))
12043 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12045 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12047 /* We know that this was set up by `grokclassfn'. We do not
12048 wait until `store_parm_decls', since evil parse errors may
12049 never get us to that point. Here we keep the consistency
12050 between `current_class_type' and `current_class_ptr'. */
12051 tree t = DECL_ARGUMENTS (decl1);
12053 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12054 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12056 cp_function_chain->x_current_class_ref
12057 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12058 cp_function_chain->x_current_class_ptr = t;
12060 /* Constructors and destructors need to know whether they're "in
12061 charge" of initializing virtual base classes. */
12062 t = TREE_CHAIN (t);
12063 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12065 current_in_charge_parm = t;
12066 t = TREE_CHAIN (t);
12068 if (DECL_HAS_VTT_PARM_P (decl1))
12070 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12071 current_vtt_parm = t;
12075 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12076 /* Implicitly-defined methods (like the
12077 destructor for a class in which no destructor
12078 is explicitly declared) must not be defined
12079 until their definition is needed. So, we
12080 ignore interface specifications for
12081 compiler-generated functions. */
12082 && !DECL_ARTIFICIAL (decl1));
12084 if (DECL_INTERFACE_KNOWN (decl1))
12086 tree ctx = decl_function_context (decl1);
12088 if (DECL_NOT_REALLY_EXTERN (decl1))
12089 DECL_EXTERNAL (decl1) = 0;
12091 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12092 && TREE_PUBLIC (ctx))
12093 /* This is a function in a local class in an extern inline
12095 comdat_linkage (decl1);
12097 /* If this function belongs to an interface, it is public.
12098 If it belongs to someone else's interface, it is also external.
12099 This only affects inlines and template instantiations. */
12100 else if (!finfo->interface_unknown && honor_interface)
12102 if (DECL_DECLARED_INLINE_P (decl1)
12103 || DECL_TEMPLATE_INSTANTIATION (decl1)
12104 || processing_template_decl)
12106 DECL_EXTERNAL (decl1)
12107 = (finfo->interface_only
12108 || (DECL_DECLARED_INLINE_P (decl1)
12109 && ! flag_implement_inlines
12110 && !DECL_VINDEX (decl1)));
12112 /* For WIN32 we also want to put these in linkonce sections. */
12113 maybe_make_one_only (decl1);
12116 DECL_EXTERNAL (decl1) = 0;
12117 DECL_INTERFACE_KNOWN (decl1) = 1;
12118 /* If this function is in an interface implemented in this file,
12119 make sure that the back end knows to emit this function
12121 if (!DECL_EXTERNAL (decl1))
12122 mark_needed (decl1);
12124 else if (finfo->interface_unknown && finfo->interface_only
12125 && honor_interface)
12127 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12128 interface, we will have both finfo->interface_unknown and
12129 finfo->interface_only set. In that case, we don't want to
12130 use the normal heuristics because someone will supply a
12131 #pragma implementation elsewhere, and deducing it here would
12132 produce a conflict. */
12133 comdat_linkage (decl1);
12134 DECL_EXTERNAL (decl1) = 0;
12135 DECL_INTERFACE_KNOWN (decl1) = 1;
12136 DECL_DEFER_OUTPUT (decl1) = 1;
12140 /* This is a definition, not a reference.
12141 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12142 if (!GNU_INLINE_P (decl1))
12143 DECL_EXTERNAL (decl1) = 0;
12145 if ((DECL_DECLARED_INLINE_P (decl1)
12146 || DECL_TEMPLATE_INSTANTIATION (decl1))
12147 && ! DECL_INTERFACE_KNOWN (decl1))
12148 DECL_DEFER_OUTPUT (decl1) = 1;
12150 DECL_INTERFACE_KNOWN (decl1) = 1;
12153 /* Determine the ELF visibility attribute for the function. We must not
12154 do this before calling "pushdecl", as we must allow "duplicate_decls"
12155 to merge any attributes appropriately. We also need to wait until
12157 if (!DECL_CLONED_FUNCTION_P (decl1))
12158 determine_visibility (decl1);
12160 begin_scope (sk_function_parms, decl1);
12164 if (DECL_DESTRUCTOR_P (decl1)
12165 || (DECL_CONSTRUCTOR_P (decl1)
12166 && targetm.cxx.cdtor_returns_this ()))
12168 cdtor_label = build_decl (input_location,
12169 LABEL_DECL, NULL_TREE, NULL_TREE);
12170 DECL_CONTEXT (cdtor_label) = current_function_decl;
12173 start_fname_decls ();
12175 store_parm_decls (current_function_parms);
12179 /* Like start_preparsed_function, except that instead of a
12180 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12182 Returns 1 on success. If the DECLARATOR is not suitable for a function
12183 (it defines a datum instead), we return 0, which tells
12184 yyparse to report a parse error. */
12187 start_function (cp_decl_specifier_seq *declspecs,
12188 const cp_declarator *declarator,
12193 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12194 if (decl1 == error_mark_node)
12196 /* If the declarator is not suitable for a function definition,
12197 cause a syntax error. */
12198 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12200 error ("invalid function declaration");
12204 if (DECL_MAIN_P (decl1))
12205 /* main must return int. grokfndecl should have corrected it
12206 (and issued a diagnostic) if the user got it wrong. */
12207 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12208 integer_type_node));
12210 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12215 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12219 use_eh_spec_block (tree fn)
12221 return (flag_exceptions && flag_enforce_eh_specs
12222 && !processing_template_decl
12223 && !type_throw_all_p (TREE_TYPE (fn))
12224 /* We insert the EH_SPEC_BLOCK only in the original
12225 function; then, it is copied automatically to the
12227 && !DECL_CLONED_FUNCTION_P (fn)
12228 /* Implicitly-generated constructors and destructors have
12229 exception specifications. However, those specifications
12230 are the union of the possible exceptions specified by the
12231 constructors/destructors for bases and members, so no
12232 unallowed exception will ever reach this function. By
12233 not creating the EH_SPEC_BLOCK we save a little memory,
12234 and we avoid spurious warnings about unreachable
12236 && !DECL_ARTIFICIAL (fn));
12239 /* Store the parameter declarations into the current function declaration.
12240 This is called after parsing the parameter declarations, before
12241 digesting the body of the function.
12243 Also install to binding contour return value identifier, if any. */
12246 store_parm_decls (tree current_function_parms)
12248 tree fndecl = current_function_decl;
12251 /* This is a chain of any other decls that came in among the parm
12252 declarations. If a parm is declared with enum {foo, bar} x;
12253 then CONST_DECLs for foo and bar are put here. */
12254 tree nonparms = NULL_TREE;
12256 if (current_function_parms)
12258 /* This case is when the function was defined with an ANSI prototype.
12259 The parms already have decls, so we need not do anything here
12260 except record them as in effect
12261 and complain if any redundant old-style parm decls were written. */
12263 tree specparms = current_function_parms;
12266 /* Must clear this because it might contain TYPE_DECLs declared
12268 current_binding_level->names = NULL;
12270 /* If we're doing semantic analysis, then we'll call pushdecl
12271 for each of these. We must do them in reverse order so that
12272 they end in the correct forward order. */
12273 specparms = nreverse (specparms);
12275 for (parm = specparms; parm; parm = next)
12277 next = TREE_CHAIN (parm);
12278 if (TREE_CODE (parm) == PARM_DECL)
12280 if (DECL_NAME (parm) == NULL_TREE
12281 || TREE_CODE (parm) != VOID_TYPE)
12284 error ("parameter %qD declared void", parm);
12288 /* If we find an enum constant or a type tag,
12289 put it aside for the moment. */
12290 TREE_CHAIN (parm) = NULL_TREE;
12291 nonparms = chainon (nonparms, parm);
12295 /* Get the decls in their original chain order and record in the
12296 function. This is all and only the PARM_DECLs that were
12297 pushed into scope by the loop above. */
12298 DECL_ARGUMENTS (fndecl) = getdecls ();
12301 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12303 /* Now store the final chain of decls for the arguments
12304 as the decl-chain of the current lexical scope.
12305 Put the enumerators in as well, at the front so that
12306 DECL_ARGUMENTS is not modified. */
12307 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12309 if (use_eh_spec_block (current_function_decl))
12310 current_eh_spec_block = begin_eh_spec_block ();
12314 /* We have finished doing semantic analysis on DECL, but have not yet
12315 generated RTL for its body. Save away our current state, so that
12316 when we want to generate RTL later we know what to do. */
12319 save_function_data (tree decl)
12321 struct language_function *f;
12323 /* Save the language-specific per-function data so that we can
12324 get it back when we really expand this function. */
12325 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12328 f = ggc_alloc_language_function ();
12329 memcpy (f, cp_function_chain, sizeof (struct language_function));
12330 DECL_SAVED_FUNCTION_DATA (decl) = f;
12332 /* Clear out the bits we don't need. */
12333 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12334 f->bindings = NULL;
12335 f->x_local_names = NULL;
12339 /* Set the return value of the constructor (if present). */
12342 finish_constructor_body (void)
12347 if (targetm.cxx.cdtor_returns_this ()
12348 && (! TYPE_FOR_JAVA (current_class_type)))
12350 /* Any return from a constructor will end up here. */
12351 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12353 val = DECL_ARGUMENTS (current_function_decl);
12354 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12355 DECL_RESULT (current_function_decl), val);
12356 /* Return the address of the object. */
12357 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12358 add_stmt (exprstmt);
12362 /* Do all the processing for the beginning of a destructor; set up the
12363 vtable pointers and cleanups for bases and members. */
12366 begin_destructor_body (void)
12368 tree compound_stmt;
12370 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12371 issued an error message. We still want to try to process the
12372 body of the function, but initialize_vtbl_ptrs will crash if
12373 TYPE_BINFO is NULL. */
12374 if (COMPLETE_TYPE_P (current_class_type))
12376 compound_stmt = begin_compound_stmt (0);
12377 /* Make all virtual function table pointers in non-virtual base
12378 classes point to CURRENT_CLASS_TYPE's virtual function
12380 initialize_vtbl_ptrs (current_class_ptr);
12381 finish_compound_stmt (compound_stmt);
12383 /* And insert cleanups for our bases and members so that they
12384 will be properly destroyed if we throw. */
12385 push_base_cleanups ();
12389 /* At the end of every destructor we generate code to delete the object if
12390 necessary. Do that now. */
12393 finish_destructor_body (void)
12397 /* Any return from a destructor will end up here; that way all base
12398 and member cleanups will be run when the function returns. */
12399 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12401 /* In a virtual destructor, we must call delete. */
12402 if (DECL_VIRTUAL_P (current_function_decl))
12405 tree virtual_size = cxx_sizeof (current_class_type);
12409 At the point of definition of a virtual destructor (including
12410 an implicit definition), non-placement operator delete shall
12411 be looked up in the scope of the destructor's class and if
12412 found shall be accessible and unambiguous. */
12413 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12415 /*global_p=*/false,
12416 /*placement=*/NULL_TREE,
12417 /*alloc_fn=*/NULL_TREE);
12419 if_stmt = begin_if_stmt ();
12420 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12421 current_in_charge_parm,
12424 finish_expr_stmt (exprstmt);
12425 finish_then_clause (if_stmt);
12426 finish_if_stmt (if_stmt);
12429 if (targetm.cxx.cdtor_returns_this ())
12433 val = DECL_ARGUMENTS (current_function_decl);
12434 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12435 DECL_RESULT (current_function_decl), val);
12436 /* Return the address of the object. */
12437 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12438 add_stmt (exprstmt);
12442 /* Do the necessary processing for the beginning of a function body, which
12443 in this case includes member-initializers, but not the catch clauses of
12444 a function-try-block. Currently, this means opening a binding level
12445 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12448 begin_function_body (void)
12452 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12455 if (processing_template_decl)
12456 /* Do nothing now. */;
12458 /* Always keep the BLOCK node associated with the outermost pair of
12459 curly braces of a function. These are needed for correct
12460 operation of dwarfout.c. */
12461 keep_next_level (true);
12463 stmt = begin_compound_stmt (BCS_FN_BODY);
12465 if (processing_template_decl)
12466 /* Do nothing now. */;
12467 else if (DECL_DESTRUCTOR_P (current_function_decl))
12468 begin_destructor_body ();
12473 /* Do the processing for the end of a function body. Currently, this means
12474 closing out the cleanups for fully-constructed bases and members, and in
12475 the case of the destructor, deleting the object if desired. Again, this
12476 is only meaningful for [cd]tors, since they are the only functions where
12477 there is a significant distinction between the main body and any
12478 function catch clauses. Handling, say, main() return semantics here
12479 would be wrong, as flowing off the end of a function catch clause for
12480 main() would also need to return 0. */
12483 finish_function_body (tree compstmt)
12485 if (compstmt == NULL_TREE)
12488 /* Close the block. */
12489 finish_compound_stmt (compstmt);
12491 if (processing_template_decl)
12492 /* Do nothing now. */;
12493 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12494 finish_constructor_body ();
12495 else if (DECL_DESTRUCTOR_P (current_function_decl))
12496 finish_destructor_body ();
12499 /* Given a function, returns the BLOCK corresponding to the outermost level
12500 of curly braces, skipping the artificial block created for constructor
12504 outer_curly_brace_block (tree fndecl)
12506 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12507 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12508 /* Skip the artificial function body block. */
12509 block = BLOCK_SUBBLOCKS (block);
12513 /* If FNDECL is a class's key method, add the class to the list of
12514 keyed classes that should be emitted. */
12517 record_key_method_defined (tree fndecl)
12519 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12520 && DECL_VIRTUAL_P (fndecl)
12521 && !processing_template_decl)
12523 tree fnclass = DECL_CONTEXT (fndecl);
12524 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12525 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12529 /* Finish up a function declaration and compile that function
12530 all the way to assembler language output. The free the storage
12531 for the function definition.
12533 FLAGS is a bitwise or of the following values:
12535 We just finished processing the body of an in-class inline
12536 function definition. (This processing will have taken place
12537 after the class definition is complete.) */
12540 finish_function (int flags)
12542 tree fndecl = current_function_decl;
12543 tree fntype, ctype = NULL_TREE;
12544 int inclass_inline = (flags & 2) != 0;
12547 /* When we get some parse errors, we can end up without a
12548 current_function_decl, so cope. */
12549 if (fndecl == NULL_TREE)
12550 return error_mark_node;
12552 gcc_assert (!defer_mark_used_calls);
12553 defer_mark_used_calls = true;
12555 record_key_method_defined (fndecl);
12557 nested = function_depth > 1;
12558 fntype = TREE_TYPE (fndecl);
12560 /* TREE_READONLY (fndecl) = 1;
12561 This caused &foo to be of type ptr-to-const-function
12562 which then got a warning when stored in a ptr-to-function variable. */
12564 gcc_assert (building_stmt_tree ());
12565 /* The current function is being defined, so its DECL_INITIAL should
12566 be set, and unless there's a multiple definition, it should be
12567 error_mark_node. */
12568 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12570 /* For a cloned function, we've already got all the code we need;
12571 there's no need to add any extra bits. */
12572 if (!DECL_CLONED_FUNCTION_P (fndecl))
12574 if (DECL_MAIN_P (current_function_decl))
12578 /* Make it so that `main' always returns 0 by default (or
12581 stmt = finish_return_stmt (integer_one_node);
12583 stmt = finish_return_stmt (integer_zero_node);
12585 /* Hack. We don't want the middle-end to warn that this
12586 return is unreachable, so put the statement on the
12589 location_t linezero = linemap_line_start (line_table, 0, 1);
12590 SET_EXPR_LOCATION (stmt, linezero);
12594 if (use_eh_spec_block (current_function_decl))
12595 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12596 (TREE_TYPE (current_function_decl)),
12597 current_eh_spec_block);
12600 /* If we're saving up tree structure, tie off the function now. */
12601 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12603 finish_fname_decls ();
12605 /* If this function can't throw any exceptions, remember that. */
12606 if (!processing_template_decl
12607 && !cp_function_chain->can_throw
12608 && !flag_non_call_exceptions
12609 && !DECL_REPLACEABLE_P (fndecl))
12610 TREE_NOTHROW (fndecl) = 1;
12612 /* This must come after expand_function_end because cleanups might
12613 have declarations (from inline functions) that need to go into
12614 this function's blocks. */
12616 /* If the current binding level isn't the outermost binding level
12617 for this function, either there is a bug, or we have experienced
12618 syntax errors and the statement tree is malformed. */
12619 if (current_binding_level->kind != sk_function_parms)
12621 /* Make sure we have already experienced errors. */
12622 gcc_assert (errorcount);
12624 /* Throw away the broken statement tree and extra binding
12626 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12628 while (current_binding_level->kind != sk_function_parms)
12630 if (current_binding_level->kind == sk_class)
12631 pop_nested_class ();
12633 poplevel (0, 0, 0);
12636 poplevel (1, 0, 1);
12638 /* Statements should always be full-expressions at the outermost set
12639 of curly braces for a function. */
12640 gcc_assert (stmts_are_full_exprs_p ());
12642 /* Set up the named return value optimization, if we can. Candidate
12643 variables are selected in check_return_expr. */
12644 if (current_function_return_value)
12646 tree r = current_function_return_value;
12649 if (r != error_mark_node
12650 /* This is only worth doing for fns that return in memory--and
12651 simpler, since we don't have to worry about promoted modes. */
12652 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12653 /* Only allow this for variables declared in the outer scope of
12654 the function so we know that their lifetime always ends with a
12655 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12656 we were to do this optimization in tree-ssa. */
12657 && (outer = outer_curly_brace_block (fndecl))
12658 && chain_member (r, BLOCK_VARS (outer)))
12659 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12661 current_function_return_value = NULL_TREE;
12664 /* Remember that we were in class scope. */
12665 if (current_class_name)
12666 ctype = current_class_type;
12668 /* Must mark the RESULT_DECL as being in this function. */
12669 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12671 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12672 to the FUNCTION_DECL node itself. */
12673 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12675 /* Save away current state, if appropriate. */
12676 if (!processing_template_decl)
12677 save_function_data (fndecl);
12679 /* Complain if there's just no return statement. */
12680 if (warn_return_type
12681 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12682 && !dependent_type_p (TREE_TYPE (fntype))
12683 && !current_function_returns_value && !current_function_returns_null
12684 /* Don't complain if we abort or throw. */
12685 && !current_function_returns_abnormally
12686 /* Don't complain if we are declared noreturn. */
12687 && !TREE_THIS_VOLATILE (fndecl)
12688 && !DECL_NAME (DECL_RESULT (fndecl))
12689 && !TREE_NO_WARNING (fndecl)
12690 /* Structor return values (if any) are set by the compiler. */
12691 && !DECL_CONSTRUCTOR_P (fndecl)
12692 && !DECL_DESTRUCTOR_P (fndecl))
12694 warning (OPT_Wreturn_type,
12695 "no return statement in function returning non-void");
12696 TREE_NO_WARNING (fndecl) = 1;
12699 /* Store the end of the function, so that we get good line number
12700 info for the epilogue. */
12701 cfun->function_end_locus = input_location;
12703 /* Complain about parameters that are only set, but never otherwise used. */
12704 if (warn_unused_but_set_parameter
12705 && !processing_template_decl
12706 && errorcount == unused_but_set_errorcount
12707 && !DECL_CLONED_FUNCTION_P (fndecl))
12711 for (decl = DECL_ARGUMENTS (fndecl);
12713 decl = TREE_CHAIN (decl))
12714 if (TREE_USED (decl)
12715 && TREE_CODE (decl) == PARM_DECL
12716 && !DECL_READ_P (decl)
12717 && DECL_NAME (decl)
12718 && !DECL_ARTIFICIAL (decl)
12719 && !TREE_NO_WARNING (decl)
12720 && !DECL_IN_SYSTEM_HEADER (decl)
12721 && TREE_TYPE (decl) != error_mark_node
12722 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
12723 && (!CLASS_TYPE_P (TREE_TYPE (decl))
12724 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
12725 warning (OPT_Wunused_but_set_parameter,
12726 "parameter %q+D set but not used", decl);
12727 unused_but_set_errorcount = errorcount;
12730 /* Genericize before inlining. */
12731 if (!processing_template_decl)
12733 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12734 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
12735 cp_genericize (fndecl);
12736 /* Clear out the bits we don't need. */
12737 f->x_current_class_ptr = NULL;
12738 f->x_current_class_ref = NULL;
12739 f->x_eh_spec_block = NULL;
12740 f->x_in_charge_parm = NULL;
12741 f->x_vtt_parm = NULL;
12742 f->x_return_value = NULL;
12743 f->bindings = NULL;
12744 f->extern_decl_map = NULL;
12746 /* Clear out the bits we don't need. */
12747 local_names = NULL;
12749 /* We're leaving the context of this function, so zap cfun. It's still in
12750 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12752 current_function_decl = NULL;
12754 /* If this is an in-class inline definition, we may have to pop the
12755 bindings for the template parameters that we added in
12756 maybe_begin_member_template_processing when start_function was
12758 if (inclass_inline)
12759 maybe_end_member_template_processing ();
12761 /* Leave the scope of the class. */
12763 pop_nested_class ();
12769 /* Let the error reporting routines know that we're outside a
12770 function. For a nested function, this value is used in
12771 cxx_pop_function_context and then reset via pop_function_context. */
12772 current_function_decl = NULL_TREE;
12774 defer_mark_used_calls = false;
12775 if (deferred_mark_used_calls)
12780 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12782 VEC_free (tree, gc, deferred_mark_used_calls);
12788 /* Create the FUNCTION_DECL for a function definition.
12789 DECLSPECS and DECLARATOR are the parts of the declaration;
12790 they describe the return type and the name of the function,
12791 but twisted together in a fashion that parallels the syntax of C.
12793 This function creates a binding context for the function body
12794 as well as setting up the FUNCTION_DECL in current_function_decl.
12796 Returns a FUNCTION_DECL on success.
12798 If the DECLARATOR is not suitable for a function (it defines a datum
12799 instead), we return 0, which tells yyparse to report a parse error.
12801 May return void_type_node indicating that this method is actually
12802 a friend. See grokfield for more details.
12804 Came here with a `.pushlevel' .
12806 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12807 CHANGES TO CODE IN `grokfield'. */
12810 grokmethod (cp_decl_specifier_seq *declspecs,
12811 const cp_declarator *declarator, tree attrlist)
12813 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12816 if (fndecl == error_mark_node)
12817 return error_mark_node;
12819 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12821 error ("invalid member function declaration");
12822 return error_mark_node;
12826 cplus_decl_attributes (&fndecl, attrlist, 0);
12828 /* Pass friends other than inline friend functions back. */
12829 if (fndecl == void_type_node)
12832 if (DECL_IN_AGGR_P (fndecl))
12834 if (DECL_CONTEXT (fndecl)
12835 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12836 error ("%qD is already defined in class %qT", fndecl,
12837 DECL_CONTEXT (fndecl));
12838 return error_mark_node;
12841 check_template_shadow (fndecl);
12843 DECL_DECLARED_INLINE_P (fndecl) = 1;
12844 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12846 /* We process method specializations in finish_struct_1. */
12847 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12849 fndecl = push_template_decl (fndecl);
12850 if (fndecl == error_mark_node)
12854 if (! DECL_FRIEND_P (fndecl))
12856 if (TREE_CHAIN (fndecl))
12858 fndecl = copy_node (fndecl);
12859 TREE_CHAIN (fndecl) = NULL_TREE;
12863 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12865 DECL_IN_AGGR_P (fndecl) = 1;
12870 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12871 we can lay it out later, when and if its type becomes complete. */
12874 maybe_register_incomplete_var (tree var)
12876 gcc_assert (TREE_CODE (var) == VAR_DECL);
12878 /* Keep track of variables with incomplete types. */
12879 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12880 && DECL_EXTERNAL (var))
12882 tree inner_type = TREE_TYPE (var);
12884 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12885 inner_type = TREE_TYPE (inner_type);
12886 inner_type = TYPE_MAIN_VARIANT (inner_type);
12888 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12889 /* RTTI TD entries are created while defining the type_info. */
12890 || (TYPE_LANG_SPECIFIC (inner_type)
12891 && TYPE_BEING_DEFINED (inner_type)))
12892 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12896 /* Called when a class type (given by TYPE) is defined. If there are
12897 any existing VAR_DECLs whose type has been completed by this
12898 declaration, update them now. */
12901 complete_vars (tree type)
12903 tree *list = &incomplete_vars;
12905 gcc_assert (CLASS_TYPE_P (type));
12908 if (same_type_p (type, TREE_PURPOSE (*list)))
12910 tree var = TREE_VALUE (*list);
12911 tree type = TREE_TYPE (var);
12912 /* Complete the type of the variable. The VAR_DECL itself
12913 will be laid out in expand_expr. */
12914 complete_type (type);
12915 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12916 /* Remove this entry from the list. */
12917 *list = TREE_CHAIN (*list);
12920 list = &TREE_CHAIN (*list);
12923 /* Check for pending declarations which may have abstract type. */
12924 complete_type_check_abstract (type);
12927 /* If DECL is of a type which needs a cleanup, build and return an
12928 expression to perform that cleanup here. Return NULL_TREE if no
12929 cleanup need be done. */
12932 cxx_maybe_build_cleanup (tree decl)
12938 /* Assume no cleanup is required. */
12939 cleanup = NULL_TREE;
12941 if (error_operand_p (decl))
12944 /* Handle "__attribute__((cleanup))". We run the cleanup function
12945 before the destructor since the destructor is what actually
12946 terminates the lifetime of the object. */
12947 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12954 /* Get the name specified by the user for the cleanup function. */
12955 id = TREE_VALUE (TREE_VALUE (attr));
12956 /* Look up the name to find the cleanup function to call. It is
12957 important to use lookup_name here because that is what is
12958 used in c-common.c:handle_cleanup_attribute when performing
12959 initial checks on the attribute. Note that those checks
12960 include ensuring that the function found is not an overloaded
12961 function, or an object with an overloaded call operator,
12962 etc.; we can rely on the fact that the function found is an
12963 ordinary FUNCTION_DECL. */
12964 fn = lookup_name (id);
12965 arg = build_address (decl);
12967 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
12970 /* Handle ordinary C++ destructors. */
12971 type = TREE_TYPE (decl);
12972 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12974 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12975 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12976 && CLASSTYPE_VBASECLASSES (type));
12980 if (TREE_CODE (type) == ARRAY_TYPE)
12983 addr = build_address (decl);
12985 /* Optimize for space over speed here. */
12986 if (!has_vbases || flag_expensive_optimizations)
12987 flags |= LOOKUP_NONVIRTUAL;
12989 call = build_delete (TREE_TYPE (addr), addr,
12990 sfk_complete_destructor, flags, 0);
12992 cleanup = build_compound_expr (input_location, cleanup, call);
13000 /* When a stmt has been parsed, this function is called. */
13007 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13008 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13009 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13012 static_fn_type (tree memfntype)
13017 if (TYPE_PTRMEMFUNC_P (memfntype))
13018 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13019 if (POINTER_TYPE_P (memfntype)
13020 || TREE_CODE (memfntype) == FUNCTION_DECL)
13021 memfntype = TREE_TYPE (memfntype);
13022 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13024 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13025 args = TYPE_ARG_TYPES (memfntype);
13026 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13027 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13028 fntype = (cp_build_type_attribute_variant
13029 (fntype, TYPE_ATTRIBUTES (memfntype)));
13030 fntype = (build_exception_variant
13031 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13035 /* DECL was originally constructed as a non-static member function,
13036 but turned out to be static. Update it accordingly. */
13039 revert_static_member_fn (tree decl)
13041 TREE_TYPE (decl) = static_fn_type (decl);
13043 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13044 error ("static member function %q#D declared with type qualifiers", decl);
13046 if (DECL_ARGUMENTS (decl))
13047 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
13048 DECL_STATIC_FUNCTION_P (decl) = 1;
13051 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13052 one of the language-independent trees. */
13054 enum cp_tree_node_structure_enum
13055 cp_tree_node_structure (union lang_tree_node * t)
13057 switch (TREE_CODE (&t->generic))
13059 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13060 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13061 case OVERLOAD: return TS_CP_OVERLOAD;
13062 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13063 case PTRMEM_CST: return TS_CP_PTRMEM;
13064 case BASELINK: return TS_CP_BASELINK;
13065 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13066 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13067 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13068 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13069 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13070 default: return TS_CP_GENERIC;
13074 /* Build the void_list_node (void_type_node having been created). */
13076 build_void_list_node (void)
13078 tree t = build_tree_list (NULL_TREE, void_type_node);
13083 cp_missing_noreturn_ok_p (tree decl)
13085 /* A missing noreturn is ok for the `main' function. */
13086 return DECL_MAIN_P (decl);
13089 /* Return the COMDAT group into which DECL should be placed. */
13092 cxx_comdat_group (tree decl)
13096 /* Virtual tables, construction virtual tables, and virtual table
13097 tables all go in a single COMDAT group, named after the primary
13099 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13100 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13101 /* For all other DECLs, the COMDAT group is the mangled name of the
13102 declaration itself. */
13105 while (DECL_THUNK_P (decl))
13107 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13108 into the same section as the target function. In that case
13109 we must return target's name. */
13110 tree target = THUNK_TARGET (decl);
13111 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13112 && DECL_SECTION_NAME (target) != NULL
13113 && DECL_ONE_ONLY (target))
13118 name = DECL_ASSEMBLER_NAME (decl);
13124 #include "gt-cp-decl.h"