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"
47 #include "c-family/c-common.h"
48 #include "c-family/c-pragma.h"
49 #include "diagnostic.h"
53 #include "pointer-set.h"
54 #include "splay-tree.h"
57 /* Possible cases of bad specifiers type used by bad_specifiers. */
59 BSP_VAR, /* variable */
60 BSP_PARM, /* parameter */
65 static tree grokparms (tree parmlist, tree *);
66 static const char *redeclaration_error_message (tree, tree);
68 static int decl_jump_unsafe (tree);
69 static void require_complete_types_for_parms (tree);
70 static int ambi_op_p (enum tree_code);
71 static int unary_op_p (enum tree_code);
72 static void push_local_name (tree);
73 static tree grok_reference_init (tree, tree, tree, tree *);
74 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
76 static void record_unknown_type (tree, const char *);
77 static tree builtin_function_1 (tree, tree, bool);
78 static tree build_library_fn_1 (tree, enum tree_code, tree);
79 static int member_function_or_else (tree, tree, enum overload_flags);
80 static void bad_specifiers (tree, enum bad_spec_place, int, int, int, int,
82 static void check_for_uninitialized_const_var (tree);
83 static hashval_t typename_hash (const void *);
84 static int typename_compare (const void *, const void *);
85 static tree local_variable_p_walkfn (tree *, int *, void *);
86 static tree record_builtin_java_type (const char *, int);
87 static const char *tag_name (enum tag_types);
88 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
89 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
90 static void maybe_deduce_size_from_array_init (tree, tree);
91 static void layout_var_decl (tree);
92 static tree check_initializer (tree, tree, int, tree *);
93 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
94 static void save_function_data (tree);
95 static void copy_type_enum (tree , tree);
96 static void check_function_type (tree, tree);
97 static void finish_constructor_body (void);
98 static void begin_destructor_body (void);
99 static void finish_destructor_body (void);
100 static void record_key_method_defined (tree);
101 static tree create_array_type_for_decl (tree, tree, tree);
102 static tree get_atexit_node (void);
103 static tree get_dso_handle_node (void);
104 static tree start_cleanup_fn (void);
105 static void end_cleanup_fn (void);
106 static tree cp_make_fname_decl (location_t, tree, int);
107 static void initialize_predefined_identifiers (void);
108 static tree check_special_function_return_type
109 (special_function_kind, tree, tree);
110 static tree push_cp_library_fn (enum tree_code, tree);
111 static tree build_cp_library_fn (tree, enum tree_code, tree);
112 static void store_parm_decls (tree);
113 static void initialize_local_var (tree, tree);
114 static void expand_static_init (tree, tree);
116 /* The following symbols are subsumed in the cp_global_trees array, and
117 listed here individually for documentation purposes.
120 tree wchar_decl_node;
122 tree vtable_entry_type;
123 tree delta_type_node;
124 tree __t_desc_type_node;
126 tree class_type_node;
127 tree unknown_type_node;
129 Array type `vtable_entry_type[]'
132 tree vtbl_ptr_type_node;
139 A FUNCTION_DECL which can call `abort'. Not necessarily the
140 one that the user will declare, but sufficient to be called
141 by routines that want to abort the program.
145 The FUNCTION_DECL for the default `::operator delete'.
147 tree global_delete_fndecl;
150 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
151 tree tinfo_var_id; */
153 tree cp_global_trees[CPTI_MAX];
155 /* Indicates that there is a type value in some namespace, although
156 that is not necessarily in scope at the moment. */
158 tree global_type_node;
160 /* The node that holds the "name" of the global scope. */
161 tree global_scope_name;
163 #define local_names cp_function_chain->x_local_names
165 /* A list of objects which have constructors or destructors
166 which reside in the global scope. The decl is stored in
167 the TREE_VALUE slot and the initializer is stored
168 in the TREE_PURPOSE slot. */
169 tree static_aggregates;
173 /* A node for the integer constant 2. */
175 tree integer_two_node;
177 /* Used only for jumps to as-yet undefined labels, since jumps to
178 defined labels can have their validity checked immediately. */
180 struct GTY(()) named_label_use_entry {
181 struct named_label_use_entry *next;
182 /* The binding level to which this entry is *currently* attached.
183 This is initially the binding level in which the goto appeared,
184 but is modified as scopes are closed. */
185 struct cp_binding_level *binding_level;
186 /* The head of the names list that was current when the goto appeared,
187 or the inner scope popped. These are the decls that will *not* be
188 skipped when jumping to the label. */
190 /* The location of the goto, for error reporting. */
191 location_t o_goto_locus;
192 /* True if an OpenMP structured block scope has been closed since
193 the goto appeared. This means that the branch from the label will
194 illegally exit an OpenMP scope. */
198 /* A list of all LABEL_DECLs in the function that have names. Here so
199 we can clear out their names' definitions at the end of the
200 function, and so we can check the validity of jumps to these labels. */
202 struct GTY(()) named_label_entry {
203 /* The decl itself. */
206 /* The binding level to which the label is *currently* attached.
207 This is initially set to the binding level in which the label
208 is defined, but is modified as scopes are closed. */
209 struct cp_binding_level *binding_level;
210 /* The head of the names list that was current when the label was
211 defined, or the inner scope popped. These are the decls that will
212 be skipped when jumping to the label. */
214 /* A vector of all decls from all binding levels that would be
215 crossed by a backward branch to the label. */
216 VEC(tree,gc) *bad_decls;
218 /* A list of uses of the label, before the label is defined. */
219 struct named_label_use_entry *uses;
221 /* The following bits are set after the label is defined, and are
222 updated as scopes are popped. They indicate that a backward jump
223 to the label will illegally enter a scope of the given flavor. */
229 #define named_labels cp_function_chain->x_named_labels
231 /* The number of function bodies which we are currently processing.
232 (Zero if we are at namespace scope, one inside the body of a
233 function, two inside the body of a function in a local class, etc.) */
236 /* To avoid unwanted recursion, finish_function defers all mark_used calls
237 encountered during its execution until it finishes. */
238 bool defer_mark_used_calls;
239 VEC(tree, gc) *deferred_mark_used_calls;
241 /* States indicating how grokdeclarator() should handle declspecs marked
242 with __attribute__((deprecated)). An object declared as
243 __attribute__((deprecated)) suppresses warnings of uses of other
245 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
248 /* A list of VAR_DECLs whose type was incomplete at the time the
249 variable was declared. */
251 typedef struct GTY(()) incomplete_var_d {
253 tree incomplete_type;
256 DEF_VEC_O(incomplete_var);
257 DEF_VEC_ALLOC_O(incomplete_var,gc);
259 static GTY(()) VEC(incomplete_var,gc) *incomplete_vars;
261 /* Returns the kind of template specialization we are currently
262 processing, given that it's declaration contained N_CLASS_SCOPES
263 explicit scope qualifications. */
266 current_tmpl_spec_kind (int n_class_scopes)
268 int n_template_parm_scopes = 0;
269 int seen_specialization_p = 0;
270 int innermost_specialization_p = 0;
271 struct cp_binding_level *b;
273 /* Scan through the template parameter scopes. */
274 for (b = current_binding_level;
275 b->kind == sk_template_parms;
278 /* If we see a specialization scope inside a parameter scope,
279 then something is wrong. That corresponds to a declaration
282 template <class T> template <> ...
284 which is always invalid since [temp.expl.spec] forbids the
285 specialization of a class member template if the enclosing
286 class templates are not explicitly specialized as well. */
287 if (b->explicit_spec_p)
289 if (n_template_parm_scopes == 0)
290 innermost_specialization_p = 1;
292 seen_specialization_p = 1;
294 else if (seen_specialization_p == 1)
295 return tsk_invalid_member_spec;
297 ++n_template_parm_scopes;
300 /* Handle explicit instantiations. */
301 if (processing_explicit_instantiation)
303 if (n_template_parm_scopes != 0)
304 /* We've seen a template parameter list during an explicit
305 instantiation. For example:
307 template <class T> template void f(int);
309 This is erroneous. */
310 return tsk_invalid_expl_inst;
312 return tsk_expl_inst;
315 if (n_template_parm_scopes < n_class_scopes)
316 /* We've not seen enough template headers to match all the
317 specialized classes present. For example:
319 template <class T> void R<T>::S<T>::f(int);
321 This is invalid; there needs to be one set of template
322 parameters for each class. */
323 return tsk_insufficient_parms;
324 else if (n_template_parm_scopes == n_class_scopes)
325 /* We're processing a non-template declaration (even though it may
326 be a member of a template class.) For example:
328 template <class T> void S<T>::f(int);
330 The `class T' matches the `S<T>', leaving no template headers
331 corresponding to the `f'. */
333 else if (n_template_parm_scopes > n_class_scopes + 1)
334 /* We've got too many template headers. For example:
336 template <> template <class T> void f (T);
338 There need to be more enclosing classes. */
339 return tsk_excessive_parms;
341 /* This must be a template. It's of the form:
343 template <class T> template <class U> void S<T>::f(U);
345 This is a specialization if the innermost level was a
346 specialization; otherwise it's just a definition of the
348 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
351 /* Exit the current scope. */
359 /* When a label goes out of scope, check to see if that label was used
360 in a valid manner, and issue any appropriate warnings or errors. */
363 pop_label (tree label, tree old_value)
365 if (!processing_template_decl)
367 if (DECL_INITIAL (label) == NULL_TREE)
371 error ("label %q+D used but not defined", label);
372 location = input_location; /* FIXME want (input_filename, (line)0) */
373 /* Avoid crashing later. */
374 define_label (location, DECL_NAME (label));
377 warn_for_unused_label (label);
380 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
383 /* At the end of a function, all labels declared within the function
384 go out of scope. BLOCK is the top-level block for the
388 pop_labels_1 (void **slot, void *data)
390 struct named_label_entry *ent = (struct named_label_entry *) *slot;
391 tree block = (tree) data;
393 pop_label (ent->label_decl, NULL_TREE);
395 /* Put the labels into the "variables" of the top-level block,
396 so debugger can see them. */
397 DECL_CHAIN (ent->label_decl) = BLOCK_VARS (block);
398 BLOCK_VARS (block) = ent->label_decl;
400 htab_clear_slot (named_labels, slot);
406 pop_labels (tree block)
410 htab_traverse (named_labels, pop_labels_1, block);
415 /* At the end of a block with local labels, restore the outer definition. */
418 pop_local_label (tree label, tree old_value)
420 struct named_label_entry dummy;
423 pop_label (label, old_value);
425 dummy.label_decl = label;
426 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
427 htab_clear_slot (named_labels, slot);
430 /* The following two routines are used to interface to Objective-C++.
431 The binding level is purposely treated as an opaque type. */
434 objc_get_current_scope (void)
436 return current_binding_level;
439 /* The following routine is used by the NeXT-style SJLJ exceptions;
440 variables get marked 'volatile' so as to not be clobbered by
441 _setjmp()/_longjmp() calls. All variables in the current scope,
442 as well as parent scopes up to (but not including) ENCLOSING_BLK
443 shall be thusly marked. */
446 objc_mark_locals_volatile (void *enclosing_blk)
448 struct cp_binding_level *scope;
450 for (scope = current_binding_level;
451 scope && scope != enclosing_blk;
452 scope = scope->level_chain)
456 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
457 objc_volatilize_decl (decl);
459 /* Do not climb up past the current function. */
460 if (scope->kind == sk_function_parms)
465 /* Update data for defined and undefined labels when leaving a scope. */
468 poplevel_named_label_1 (void **slot, void *data)
470 struct named_label_entry *ent = (struct named_label_entry *) *slot;
471 struct cp_binding_level *bl = (struct cp_binding_level *) data;
472 struct cp_binding_level *obl = bl->level_chain;
474 if (ent->binding_level == bl)
478 for (decl = ent->names_in_scope; decl; decl = DECL_CHAIN (decl))
479 if (decl_jump_unsafe (decl))
480 VEC_safe_push (tree, gc, ent->bad_decls, decl);
482 ent->binding_level = obl;
483 ent->names_in_scope = obl->names;
487 ent->in_try_scope = true;
490 ent->in_catch_scope = true;
493 ent->in_omp_scope = true;
501 struct named_label_use_entry *use;
503 for (use = ent->uses; use ; use = use->next)
504 if (use->binding_level == bl)
506 use->binding_level = obl;
507 use->names_in_scope = obl->names;
508 if (bl->kind == sk_omp)
509 use->in_omp_scope = true;
516 /* Saved errorcount to avoid -Wunused-but-set-{parameter,variable} warnings
517 when errors were reported, except for -Werror-unused-but-set-*. */
518 static int unused_but_set_errorcount;
520 /* Exit a binding level.
521 Pop the level off, and restore the state of the identifier-decl mappings
522 that were in effect when this level was entered.
524 If KEEP == 1, this level had explicit declarations, so
525 and create a "block" (a BLOCK node) for the level
526 to record its declarations and subblocks for symbol table output.
528 If FUNCTIONBODY is nonzero, this level is the body of a function,
529 so create a block as if KEEP were set and also clear out all
532 If REVERSE is nonzero, reverse the order of decls before putting
533 them into the BLOCK. */
536 poplevel (int keep, int reverse, int functionbody)
539 /* The chain of decls was accumulated in reverse order.
540 Put it into forward order, just for cleanliness. */
545 int leaving_for_scope;
548 cp_label_binding *label_bind;
550 timevar_push (TV_NAME_LOOKUP);
555 gcc_assert (current_binding_level->kind != sk_class);
557 if (current_binding_level->kind == sk_cleanup)
559 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
561 gcc_assert (!VEC_length(cp_class_binding,
562 current_binding_level->class_shadowed));
564 /* We used to use KEEP == 2 to indicate that the new block should go
565 at the beginning of the list of blocks at this binding level,
566 rather than the end. This hack is no longer used. */
567 gcc_assert (keep == 0 || keep == 1);
569 if (current_binding_level->keep)
572 /* Any uses of undefined labels, and any defined labels, now operate
573 under constraints of next binding contour. */
574 if (cfun && !functionbody && named_labels)
575 htab_traverse (named_labels, poplevel_named_label_1,
576 current_binding_level);
578 /* Get the decls in the order they were written.
579 Usually current_binding_level->names is in reverse order.
580 But parameter decls were previously put in forward order. */
583 current_binding_level->names
584 = decls = nreverse (current_binding_level->names);
586 decls = current_binding_level->names;
588 /* If there were any declarations or structure tags in that level,
589 or if this level is a function body,
590 create a BLOCK to record them for the life of this function. */
592 if (keep == 1 || functionbody)
593 block = make_node (BLOCK);
594 if (block != NULL_TREE)
596 BLOCK_VARS (block) = decls;
597 BLOCK_SUBBLOCKS (block) = subblocks;
600 /* In each subblock, record that this is its superior. */
602 for (link = subblocks; link; link = BLOCK_CHAIN (link))
603 BLOCK_SUPERCONTEXT (link) = block;
605 /* We still support the old for-scope rules, whereby the variables
606 in a for-init statement were in scope after the for-statement
607 ended. We only use the new rules if flag_new_for_scope is
610 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
612 /* Before we remove the declarations first check for unused variables. */
613 if ((warn_unused_variable || warn_unused_but_set_variable)
614 && !processing_template_decl)
615 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
616 if (TREE_CODE (decl) == VAR_DECL
617 && (! TREE_USED (decl) || !DECL_READ_P (decl))
618 && ! DECL_IN_SYSTEM_HEADER (decl)
619 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
621 if (! TREE_USED (decl))
622 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
623 else if (DECL_CONTEXT (decl) == current_function_decl
624 && TREE_TYPE (decl) != error_mark_node
625 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
626 && errorcount == unused_but_set_errorcount
627 && (!CLASS_TYPE_P (TREE_TYPE (decl))
628 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
630 warning (OPT_Wunused_but_set_variable,
631 "variable %q+D set but not used", decl);
632 unused_but_set_errorcount = errorcount;
636 /* Remove declarations for all the DECLs in this level. */
637 for (link = decls; link; link = TREE_CHAIN (link))
639 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
642 tree name = DECL_NAME (link);
646 ob = outer_binding (name,
647 IDENTIFIER_BINDING (name),
650 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
652 ns_binding = NULL_TREE;
654 if (ob && ob->scope == current_binding_level->level_chain)
655 /* We have something like:
660 and we are leaving the `for' scope. There's no reason to
661 keep the binding of the inner `i' in this case. */
662 pop_binding (name, link);
663 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
664 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
665 /* Here, we have something like:
673 We must pop the for-scope binding so we know what's a
674 type and what isn't. */
675 pop_binding (name, link);
678 /* Mark this VAR_DECL as dead so that we can tell we left it
679 there only for backward compatibility. */
680 DECL_DEAD_FOR_LOCAL (link) = 1;
682 /* Keep track of what should have happened when we
683 popped the binding. */
686 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
687 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
690 /* Add it to the list of dead variables in the next
691 outermost binding to that we can remove these when we
692 leave that binding. */
693 VEC_safe_push (tree, gc,
694 current_binding_level->level_chain->dead_vars_from_for,
697 /* Although we don't pop the cxx_binding, we do clear
698 its SCOPE since the scope is going away now. */
699 IDENTIFIER_BINDING (name)->scope
700 = current_binding_level->level_chain;
707 /* Remove the binding. */
710 if (TREE_CODE (decl) == TREE_LIST)
711 decl = TREE_VALUE (decl);
714 if (TREE_CODE (name) == OVERLOAD)
715 name = OVL_FUNCTION (name);
717 gcc_assert (DECL_P (name));
718 pop_binding (DECL_NAME (name), decl);
722 /* Remove declarations for any `for' variables from inner scopes
723 that we kept around. */
724 FOR_EACH_VEC_ELT_REVERSE (tree, current_binding_level->dead_vars_from_for,
726 pop_binding (DECL_NAME (decl), decl);
728 /* Restore the IDENTIFIER_TYPE_VALUEs. */
729 for (link = current_binding_level->type_shadowed;
730 link; link = TREE_CHAIN (link))
731 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
733 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
734 FOR_EACH_VEC_ELT_REVERSE (cp_label_binding,
735 current_binding_level->shadowed_labels,
737 pop_local_label (label_bind->label, label_bind->prev_value);
739 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
740 list if a `using' declaration put them there. The debugging
741 back ends won't understand OVERLOAD, so we remove them here.
742 Because the BLOCK_VARS are (temporarily) shared with
743 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
744 popped all the bindings. */
749 for (d = &BLOCK_VARS (block); *d; )
751 if (TREE_CODE (*d) == TREE_LIST)
752 *d = TREE_CHAIN (*d);
754 d = &DECL_CHAIN (*d);
758 /* If the level being exited is the top level of a function,
759 check over all the labels. */
762 /* Since this is the top level block of a function, the vars are
763 the function's parameters. Don't leave them in the BLOCK
764 because they are found in the FUNCTION_DECL instead. */
765 BLOCK_VARS (block) = 0;
769 kind = current_binding_level->kind;
770 if (kind == sk_cleanup)
774 /* If this is a temporary binding created for a cleanup, then we'll
775 have pushed a statement list level. Pop that, create a new
776 BIND_EXPR for the block, and insert it into the stream. */
777 stmt = pop_stmt_list (current_binding_level->statement_list);
778 stmt = c_build_bind_expr (input_location, block, stmt);
785 /* The current function is being defined, so its DECL_INITIAL
786 should be error_mark_node. */
787 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
788 DECL_INITIAL (current_function_decl) = block;
791 current_binding_level->blocks
792 = chainon (current_binding_level->blocks, block);
794 /* If we did not make a block for the level just exited,
795 any blocks made for inner levels
796 (since they cannot be recorded as subblocks in that level)
797 must be carried forward so they will later become subblocks
798 of something else. */
800 current_binding_level->blocks
801 = chainon (current_binding_level->blocks, subblocks);
803 /* Each and every BLOCK node created here in `poplevel' is important
804 (e.g. for proper debugging information) so if we created one
805 earlier, mark it as "used". */
807 TREE_USED (block) = 1;
809 /* All temporary bindings created for cleanups are popped silently. */
810 if (kind == sk_cleanup)
813 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
816 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
817 itself, calling F for each. The DATA is passed to F as well. */
820 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
823 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
825 result |= (*f) (name_space, data);
827 for (; current; current = DECL_CHAIN (current))
828 result |= walk_namespaces_r (current, f, data);
833 /* Walk all the namespaces, calling F for each. The DATA is passed to
837 walk_namespaces (walk_namespaces_fn f, void* data)
839 return walk_namespaces_r (global_namespace, f, data);
842 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
843 DATA is non-NULL, this is the last time we will call
844 wrapup_global_declarations for this NAMESPACE. */
847 wrapup_globals_for_namespace (tree name_space, void* data)
849 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
850 VEC(tree,gc) *statics = level->static_decls;
851 tree *vec = VEC_address (tree, statics);
852 int len = VEC_length (tree, statics);
853 int last_time = (data != 0);
857 check_global_declarations (vec, len);
858 emit_debug_global_declarations (vec, len);
862 /* Write out any globals that need to be output. */
863 return wrapup_global_declarations (vec, len);
867 /* In C++, you don't have to write `struct S' to refer to `S'; you
868 can just use `S'. We accomplish this by creating a TYPE_DECL as
869 if the user had written `typedef struct S S'. Create and return
870 the TYPE_DECL for TYPE. */
873 create_implicit_typedef (tree name, tree type)
877 decl = build_decl (input_location, TYPE_DECL, name, type);
878 DECL_ARTIFICIAL (decl) = 1;
879 /* There are other implicit type declarations, like the one *within*
880 a class that allows you to write `S::S'. We must distinguish
882 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
883 TYPE_NAME (type) = decl;
884 TYPE_STUB_DECL (type) = decl;
889 /* Remember a local name for name-mangling purposes. */
892 push_local_name (tree decl)
897 timevar_push (TV_NAME_LOOKUP);
899 name = DECL_NAME (decl);
901 nelts = VEC_length (tree, local_names);
902 for (i = 0; i < nelts; i++)
904 t = VEC_index (tree, local_names, i);
905 if (DECL_NAME (t) == name)
907 if (!DECL_LANG_SPECIFIC (decl))
908 retrofit_lang_decl (decl);
909 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
910 if (DECL_LANG_SPECIFIC (t))
911 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
913 DECL_DISCRIMINATOR (decl) = 1;
915 VEC_replace (tree, local_names, i, decl);
916 timevar_pop (TV_NAME_LOOKUP);
921 VEC_safe_push (tree, gc, local_names, decl);
922 timevar_pop (TV_NAME_LOOKUP);
925 /* Subroutine of duplicate_decls: return truthvalue of whether
926 or not types of these decls match.
928 For C++, we must compare the parameter list so that `int' can match
929 `int&' in a parameter position, but `int&' is not confused with
933 decls_match (tree newdecl, tree olddecl)
937 if (newdecl == olddecl)
940 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
941 /* If the two DECLs are not even the same kind of thing, we're not
942 interested in their types. */
945 if (TREE_CODE (newdecl) == FUNCTION_DECL)
947 tree f1 = TREE_TYPE (newdecl);
948 tree f2 = TREE_TYPE (olddecl);
949 tree p1 = TYPE_ARG_TYPES (f1);
950 tree p2 = TYPE_ARG_TYPES (f2);
952 /* Specializations of different templates are different functions
953 even if they have the same type. */
954 tree t1 = (DECL_USE_TEMPLATE (newdecl)
955 ? DECL_TI_TEMPLATE (newdecl)
957 tree t2 = (DECL_USE_TEMPLATE (olddecl)
958 ? DECL_TI_TEMPLATE (olddecl)
963 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
964 && ! (DECL_EXTERN_C_P (newdecl)
965 && DECL_EXTERN_C_P (olddecl)))
968 #ifdef NO_IMPLICIT_EXTERN_C
969 /* A new declaration doesn't match a built-in one unless it
970 is also extern "C". */
971 if (DECL_IS_BUILTIN (olddecl)
972 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
976 if (TREE_CODE (f1) != TREE_CODE (f2))
979 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
981 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
982 && (DECL_BUILT_IN (olddecl)
983 #ifndef NO_IMPLICIT_EXTERN_C
984 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
985 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
989 types_match = self_promoting_args_p (p1);
990 if (p1 == void_list_node)
991 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
993 #ifndef NO_IMPLICIT_EXTERN_C
994 else if (p1 == NULL_TREE
995 && (DECL_EXTERN_C_P (olddecl)
996 && DECL_IN_SYSTEM_HEADER (olddecl)
997 && !DECL_CLASS_SCOPE_P (olddecl))
998 && (DECL_EXTERN_C_P (newdecl)
999 && DECL_IN_SYSTEM_HEADER (newdecl)
1000 && !DECL_CLASS_SCOPE_P (newdecl)))
1002 types_match = self_promoting_args_p (p2);
1003 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
1007 types_match = compparms (p1, p2);
1012 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1014 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
1015 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
1018 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1019 DECL_TEMPLATE_PARMS (olddecl)))
1022 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1023 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
1024 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
1026 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
1027 DECL_TEMPLATE_RESULT (newdecl));
1031 /* Need to check scope for variable declaration (VAR_DECL).
1032 For typedef (TYPE_DECL), scope is ignored. */
1033 if (TREE_CODE (newdecl) == VAR_DECL
1034 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1036 Two declarations for an object with C language linkage
1037 with the same name (ignoring the namespace that qualify
1038 it) that appear in different namespace scopes refer to
1040 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1043 if (TREE_TYPE (newdecl) == error_mark_node)
1044 types_match = TREE_TYPE (olddecl) == error_mark_node;
1045 else if (TREE_TYPE (olddecl) == NULL_TREE)
1046 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1047 else if (TREE_TYPE (newdecl) == NULL_TREE)
1050 types_match = comptypes (TREE_TYPE (newdecl),
1051 TREE_TYPE (olddecl),
1052 COMPARE_REDECLARATION);
1058 /* If NEWDECL is `static' and an `extern' was seen previously,
1059 warn about it. OLDDECL is the previous declaration.
1061 Note that this does not apply to the C++ case of declaring
1062 a variable `extern const' and then later `const'.
1064 Don't complain about built-in functions, since they are beyond
1065 the user's control. */
1068 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1070 if (TREE_CODE (newdecl) == TYPE_DECL
1071 || TREE_CODE (newdecl) == TEMPLATE_DECL
1072 || TREE_CODE (newdecl) == CONST_DECL
1073 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1076 /* Don't get confused by static member functions; that's a different
1078 if (TREE_CODE (newdecl) == FUNCTION_DECL
1079 && DECL_STATIC_FUNCTION_P (newdecl))
1082 /* If the old declaration was `static', or the new one isn't, then
1083 then everything is OK. */
1084 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1087 /* It's OK to declare a builtin function as `static'. */
1088 if (TREE_CODE (olddecl) == FUNCTION_DECL
1089 && DECL_ARTIFICIAL (olddecl))
1092 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1093 permerror (input_location, "previous declaration of %q+D", olddecl);
1096 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1097 function templates. If their exception specifications do not
1098 match, issue a diagnostic. */
1101 check_redeclaration_exception_specification (tree new_decl,
1106 tree new_exceptions;
1107 tree old_exceptions;
1109 new_type = TREE_TYPE (new_decl);
1110 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1111 old_type = TREE_TYPE (old_decl);
1112 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1116 If any declaration of a function has an exception-specification,
1117 all declarations, including the definition and an explicit
1118 specialization, of that function shall have an
1119 exception-specification with the same set of type-ids. */
1120 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1121 && ! DECL_IS_BUILTIN (old_decl)
1123 && !comp_except_specs (new_exceptions, old_exceptions, ce_normal))
1125 error ("declaration of %qF has a different exception specifier",
1127 error ("from previous declaration %q+F", old_decl);
1131 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1132 && lookup_attribute ("gnu_inline", \
1133 DECL_ATTRIBUTES (fn)))
1135 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1136 If the redeclaration is invalid, a diagnostic is issued, and the
1137 error_mark_node is returned. Otherwise, OLDDECL is returned.
1139 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1142 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1145 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1147 unsigned olddecl_uid = DECL_UID (olddecl);
1148 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1149 int new_defines_function = 0;
1150 tree new_template_info;
1152 if (newdecl == olddecl)
1155 types_match = decls_match (newdecl, olddecl);
1157 /* If either the type of the new decl or the type of the old decl is an
1158 error_mark_node, then that implies that we have already issued an
1159 error (earlier) for some bogus type specification, and in that case,
1160 it is rather pointless to harass the user with yet more error message
1161 about the same declaration, so just pretend the types match here. */
1162 if (TREE_TYPE (newdecl) == error_mark_node
1163 || TREE_TYPE (olddecl) == error_mark_node)
1164 return error_mark_node;
1166 if (DECL_P (olddecl)
1167 && TREE_CODE (newdecl) == FUNCTION_DECL
1168 && TREE_CODE (olddecl) == FUNCTION_DECL
1169 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1171 if (DECL_DECLARED_INLINE_P (newdecl)
1172 && DECL_UNINLINABLE (newdecl)
1173 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1174 /* Already warned elsewhere. */;
1175 else if (DECL_DECLARED_INLINE_P (olddecl)
1176 && DECL_UNINLINABLE (olddecl)
1177 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1178 /* Already warned. */;
1179 else if (DECL_DECLARED_INLINE_P (newdecl)
1180 && DECL_UNINLINABLE (olddecl)
1181 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1183 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1185 warning (OPT_Wattributes, "previous declaration of %q+D "
1186 "with attribute noinline", olddecl);
1188 else if (DECL_DECLARED_INLINE_P (olddecl)
1189 && DECL_UNINLINABLE (newdecl)
1190 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1192 warning (OPT_Wattributes, "function %q+D redeclared with "
1193 "attribute noinline", newdecl);
1194 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1199 /* Check for redeclaration and other discrepancies. */
1200 if (TREE_CODE (olddecl) == FUNCTION_DECL
1201 && DECL_ARTIFICIAL (olddecl))
1203 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1204 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1206 /* Avoid warnings redeclaring built-ins which have not been
1207 explicitly declared. */
1208 if (DECL_ANTICIPATED (olddecl))
1211 /* If you declare a built-in or predefined function name as static,
1212 the old definition is overridden, but optionally warn this was a
1213 bad choice of name. */
1214 if (! TREE_PUBLIC (newdecl))
1216 warning (OPT_Wshadow,
1217 DECL_BUILT_IN (olddecl)
1218 ? G_("shadowing built-in function %q#D")
1219 : G_("shadowing library function %q#D"), olddecl);
1220 /* Discard the old built-in function. */
1223 /* If the built-in is not ansi, then programs can override
1224 it even globally without an error. */
1225 else if (! DECL_BUILT_IN (olddecl))
1226 warning (0, "library function %q#D redeclared as non-function %q#D",
1230 error ("declaration of %q#D", newdecl);
1231 error ("conflicts with built-in declaration %q#D",
1236 else if (!types_match)
1238 /* Avoid warnings redeclaring built-ins which have not been
1239 explicitly declared. */
1240 if (DECL_ANTICIPATED (olddecl))
1242 /* Deal with fileptr_type_node. FILE type is not known
1243 at the time we create the builtins. */
1246 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1247 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1249 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1252 else if (TREE_VALUE (t2) == fileptr_type_node)
1254 tree t = TREE_VALUE (t1);
1256 if (TREE_CODE (t) == POINTER_TYPE
1257 && TYPE_NAME (TREE_TYPE (t))
1258 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1259 == get_identifier ("FILE")
1260 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1262 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1264 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1265 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1266 types_match = decls_match (newdecl, olddecl);
1268 return duplicate_decls (newdecl, olddecl,
1270 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1273 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1276 else if ((DECL_EXTERN_C_P (newdecl)
1277 && DECL_EXTERN_C_P (olddecl))
1278 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1279 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1281 /* A near match; override the builtin. */
1283 if (TREE_PUBLIC (newdecl))
1285 warning (0, "new declaration %q#D", newdecl);
1286 warning (0, "ambiguates built-in declaration %q#D",
1290 warning (OPT_Wshadow,
1291 DECL_BUILT_IN (olddecl)
1292 ? G_("shadowing built-in function %q#D")
1293 : G_("shadowing library function %q#D"), olddecl);
1296 /* Discard the old built-in function. */
1299 /* Replace the old RTL to avoid problems with inlining. */
1300 COPY_DECL_RTL (newdecl, olddecl);
1302 /* Even if the types match, prefer the new declarations type for
1303 built-ins which have not been explicitly declared, for
1304 exception lists, etc... */
1305 else if (DECL_IS_BUILTIN (olddecl))
1307 tree type = TREE_TYPE (newdecl);
1308 tree attribs = (*targetm.merge_type_attributes)
1309 (TREE_TYPE (olddecl), type);
1311 type = cp_build_type_attribute_variant (type, attribs);
1312 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1315 /* If a function is explicitly declared "throw ()", propagate that to
1316 the corresponding builtin. */
1317 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1318 && DECL_ANTICIPATED (olddecl)
1319 && TREE_NOTHROW (newdecl)
1320 && !TREE_NOTHROW (olddecl)
1321 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1322 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1324 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1326 /* Whether or not the builtin can throw exceptions has no
1327 bearing on this declarator. */
1328 TREE_NOTHROW (olddecl) = 0;
1330 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1332 /* If a builtin function is redeclared as `static', merge
1333 the declarations, but make the original one static. */
1334 DECL_THIS_STATIC (olddecl) = 1;
1335 TREE_PUBLIC (olddecl) = 0;
1337 /* Make the old declaration consistent with the new one so
1338 that all remnants of the builtin-ness of this function
1339 will be banished. */
1340 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1341 COPY_DECL_RTL (newdecl, olddecl);
1344 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1346 /* C++ Standard, 3.3, clause 4:
1347 "[Note: a namespace name or a class template name must be unique
1348 in its declarative region (7.3.2, clause 14). ]" */
1349 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1350 && TREE_CODE (newdecl) != NAMESPACE_DECL
1351 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1352 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1353 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1354 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1356 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1357 && TREE_CODE (newdecl) != TYPE_DECL)
1358 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1359 && TREE_CODE (olddecl) != TYPE_DECL))
1361 /* We do nothing special here, because C++ does such nasty
1362 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1363 get shadowed, and know that if we need to find a TYPE_DECL
1364 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1365 slot of the identifier. */
1369 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1370 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1371 || (TREE_CODE (olddecl) == FUNCTION_DECL
1372 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1376 error ("%q#D redeclared as different kind of symbol", newdecl);
1377 if (TREE_CODE (olddecl) == TREE_LIST)
1378 olddecl = TREE_VALUE (olddecl);
1379 error ("previous declaration of %q+#D", olddecl);
1381 return error_mark_node;
1383 else if (!types_match)
1385 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1386 /* These are certainly not duplicate declarations; they're
1387 from different scopes. */
1390 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1392 /* The name of a class template may not be declared to refer to
1393 any other template, class, function, object, namespace, value,
1394 or type in the same scope. */
1395 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1396 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1398 error ("declaration of template %q#D", newdecl);
1399 error ("conflicts with previous declaration %q+#D", olddecl);
1401 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1402 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1403 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1404 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1405 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1406 DECL_TEMPLATE_PARMS (olddecl))
1407 /* Template functions can be disambiguated by
1409 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1410 TREE_TYPE (TREE_TYPE (olddecl))))
1412 error ("new declaration %q#D", newdecl);
1413 error ("ambiguates old declaration %q+#D", olddecl);
1417 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1419 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1421 error ("declaration of C function %q#D conflicts with",
1423 error ("previous declaration %q+#D here", olddecl);
1425 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1426 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1428 error ("new declaration %q#D", newdecl);
1429 error ("ambiguates old declaration %q+#D", olddecl);
1430 return error_mark_node;
1437 error ("conflicting declaration %q#D", newdecl);
1438 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1439 return error_mark_node;
1442 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1443 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1444 && (!DECL_TEMPLATE_INFO (newdecl)
1445 || (DECL_TI_TEMPLATE (newdecl)
1446 != DECL_TI_TEMPLATE (olddecl))))
1447 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1448 && (!DECL_TEMPLATE_INFO (olddecl)
1449 || (DECL_TI_TEMPLATE (olddecl)
1450 != DECL_TI_TEMPLATE (newdecl))))))
1451 /* It's OK to have a template specialization and a non-template
1452 with the same type, or to have specializations of two
1453 different templates with the same type. Note that if one is a
1454 specialization, and the other is an instantiation of the same
1455 template, that we do not exit at this point. That situation
1456 can occur if we instantiate a template class, and then
1457 specialize one of its methods. This situation is valid, but
1458 the declarations must be merged in the usual way. */
1460 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1461 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1462 && !DECL_USE_TEMPLATE (newdecl))
1463 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1464 && !DECL_USE_TEMPLATE (olddecl))))
1465 /* One of the declarations is a template instantiation, and the
1466 other is not a template at all. That's OK. */
1468 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1470 /* In [namespace.alias] we have:
1472 In a declarative region, a namespace-alias-definition can be
1473 used to redefine a namespace-alias declared in that declarative
1474 region to refer only to the namespace to which it already
1477 Therefore, if we encounter a second alias directive for the same
1478 alias, we can just ignore the second directive. */
1479 if (DECL_NAMESPACE_ALIAS (newdecl)
1480 && (DECL_NAMESPACE_ALIAS (newdecl)
1481 == DECL_NAMESPACE_ALIAS (olddecl)))
1483 /* [namespace.alias]
1485 A namespace-name or namespace-alias shall not be declared as
1486 the name of any other entity in the same declarative region.
1487 A namespace-name defined at global scope shall not be
1488 declared as the name of any other entity in any global scope
1490 error ("declaration of namespace %qD conflicts with", newdecl);
1491 error ("previous declaration of namespace %q+D here", olddecl);
1492 return error_mark_node;
1496 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1499 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1500 if (DECL_NAME (olddecl) != NULL_TREE)
1501 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1502 ? "%q+#D previously defined here"
1503 : "%q+#D previously declared here", olddecl);
1504 return error_mark_node;
1506 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1507 && DECL_INITIAL (olddecl) != NULL_TREE
1508 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1509 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1511 /* Prototype decl follows defn w/o prototype. */
1512 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1513 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1514 "follows non-prototype definition here");
1516 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1517 || TREE_CODE (olddecl) == VAR_DECL)
1518 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1521 If two declarations of the same function or object
1522 specify different linkage-specifications ..., the program
1523 is ill-formed.... Except for functions with C++ linkage,
1524 a function declaration without a linkage specification
1525 shall not precede the first linkage specification for
1526 that function. A function can be declared without a
1527 linkage specification after an explicit linkage
1528 specification has been seen; the linkage explicitly
1529 specified in the earlier declaration is not affected by
1530 such a function declaration.
1532 DR 563 raises the question why the restrictions on
1533 functions should not also apply to objects. Older
1534 versions of G++ silently ignore the linkage-specification
1542 which is clearly wrong. Therefore, we now treat objects
1544 if (current_lang_depth () == 0)
1546 /* There is no explicit linkage-specification, so we use
1547 the linkage from the previous declaration. */
1548 if (!DECL_LANG_SPECIFIC (newdecl))
1549 retrofit_lang_decl (newdecl);
1550 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1554 error ("previous declaration of %q+#D with %qL linkage",
1555 olddecl, DECL_LANGUAGE (olddecl));
1556 error ("conflicts with new declaration with %qL linkage",
1557 DECL_LANGUAGE (newdecl));
1561 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1563 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1565 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1566 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1569 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1570 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1572 for (; t1 && t1 != void_list_node;
1573 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1574 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1576 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1579 permerror (input_location, "default argument given for parameter %d of %q#D",
1581 permerror (input_location, "after previous specification in %q+#D", olddecl);
1585 error ("default argument given for parameter %d of %q#D",
1587 error ("after previous specification in %q+#D",
1594 /* Do not merge an implicit typedef with an explicit one. In:
1598 typedef class A A __attribute__ ((foo));
1600 the attribute should apply only to the typedef. */
1601 if (TREE_CODE (olddecl) == TYPE_DECL
1602 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1603 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1606 /* If new decl is `static' and an `extern' was seen previously,
1608 warn_extern_redeclared_static (newdecl, olddecl);
1610 /* We have committed to returning 1 at this point. */
1611 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1613 /* Now that functions must hold information normally held
1614 by field decls, there is extra work to do so that
1615 declaration information does not get destroyed during
1617 if (DECL_VINDEX (olddecl))
1618 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1619 if (DECL_CONTEXT (olddecl))
1620 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1621 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1622 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1623 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1624 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1625 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1626 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1627 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1628 SET_OVERLOADED_OPERATOR_CODE
1629 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1630 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1632 /* Optionally warn about more than one declaration for the same
1633 name, but don't warn about a function declaration followed by a
1635 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1636 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1637 /* Don't warn about extern decl followed by definition. */
1638 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1639 /* Don't warn about friends, let add_friend take care of it. */
1640 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1642 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1643 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1646 if (DECL_DELETED_FN (newdecl))
1648 error ("deleted definition of %qD", newdecl);
1649 error ("after previous declaration %q+D", olddecl);
1653 /* Deal with C++: must preserve virtual function table size. */
1654 if (TREE_CODE (olddecl) == TYPE_DECL)
1656 tree newtype = TREE_TYPE (newdecl);
1657 tree oldtype = TREE_TYPE (olddecl);
1659 if (newtype != error_mark_node && oldtype != error_mark_node
1660 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1661 CLASSTYPE_FRIEND_CLASSES (newtype)
1662 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1664 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1667 /* Copy all the DECL_... slots specified in the new decl
1668 except for any that we copy here from the old type. */
1669 DECL_ATTRIBUTES (newdecl)
1670 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1672 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1676 old_result = DECL_TEMPLATE_RESULT (olddecl);
1677 new_result = DECL_TEMPLATE_RESULT (newdecl);
1678 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1679 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1680 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1681 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1683 DECL_ATTRIBUTES (old_result)
1684 = (*targetm.merge_decl_attributes) (old_result, new_result);
1686 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1688 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1689 && DECL_INITIAL (new_result))
1691 if (DECL_INITIAL (old_result))
1692 DECL_UNINLINABLE (old_result) = 1;
1694 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1695 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1696 DECL_NOT_REALLY_EXTERN (old_result)
1697 = DECL_NOT_REALLY_EXTERN (new_result);
1698 DECL_INTERFACE_KNOWN (old_result)
1699 = DECL_INTERFACE_KNOWN (new_result);
1700 DECL_DECLARED_INLINE_P (old_result)
1701 = DECL_DECLARED_INLINE_P (new_result);
1702 DECL_DISREGARD_INLINE_LIMITS (old_result)
1703 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1708 DECL_DECLARED_INLINE_P (old_result)
1709 |= DECL_DECLARED_INLINE_P (new_result);
1710 DECL_DISREGARD_INLINE_LIMITS (old_result)
1711 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1712 check_redeclaration_exception_specification (newdecl, olddecl);
1716 /* If the new declaration is a definition, update the file and
1717 line information on the declaration, and also make
1718 the old declaration the same definition. */
1719 if (DECL_INITIAL (new_result) != NULL_TREE)
1721 DECL_SOURCE_LOCATION (olddecl)
1722 = DECL_SOURCE_LOCATION (old_result)
1723 = DECL_SOURCE_LOCATION (newdecl);
1724 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1725 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1728 DECL_ARGUMENTS (old_result)
1729 = DECL_ARGUMENTS (new_result);
1730 for (parm = DECL_ARGUMENTS (old_result); parm;
1731 parm = DECL_CHAIN (parm))
1732 DECL_CONTEXT (parm) = old_result;
1741 /* Automatically handles default parameters. */
1742 tree oldtype = TREE_TYPE (olddecl);
1745 /* Merge the data types specified in the two decls. */
1746 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1748 /* If merge_types produces a non-typedef type, just use the old type. */
1749 if (TREE_CODE (newdecl) == TYPE_DECL
1750 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1753 if (TREE_CODE (newdecl) == VAR_DECL)
1755 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1756 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1757 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1758 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1759 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1760 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1762 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1763 if (DECL_LANG_SPECIFIC (olddecl)
1764 && CP_DECL_THREADPRIVATE_P (olddecl))
1766 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1767 if (!DECL_LANG_SPECIFIC (newdecl))
1768 retrofit_lang_decl (newdecl);
1770 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1771 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1775 /* Do this after calling `merge_types' so that default
1776 parameters don't confuse us. */
1777 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1778 check_redeclaration_exception_specification (newdecl, olddecl);
1779 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1781 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1782 check_default_args (newdecl);
1784 /* Lay the type out, unless already done. */
1785 if (! same_type_p (newtype, oldtype)
1786 && TREE_TYPE (newdecl) != error_mark_node
1787 && !(processing_template_decl && uses_template_parms (newdecl)))
1788 layout_type (TREE_TYPE (newdecl));
1790 if ((TREE_CODE (newdecl) == VAR_DECL
1791 || TREE_CODE (newdecl) == PARM_DECL
1792 || TREE_CODE (newdecl) == RESULT_DECL
1793 || TREE_CODE (newdecl) == FIELD_DECL
1794 || TREE_CODE (newdecl) == TYPE_DECL)
1795 && !(processing_template_decl && uses_template_parms (newdecl)))
1796 layout_decl (newdecl, 0);
1798 /* Merge the type qualifiers. */
1799 if (TREE_READONLY (newdecl))
1800 TREE_READONLY (olddecl) = 1;
1801 if (TREE_THIS_VOLATILE (newdecl))
1802 TREE_THIS_VOLATILE (olddecl) = 1;
1803 if (TREE_NOTHROW (newdecl))
1804 TREE_NOTHROW (olddecl) = 1;
1806 /* Merge deprecatedness. */
1807 if (TREE_DEPRECATED (newdecl))
1808 TREE_DEPRECATED (olddecl) = 1;
1810 /* Preserve function specific target and optimization options */
1811 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1813 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1814 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1815 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1816 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1818 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1819 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1820 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1821 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1824 /* Merge the initialization information. */
1825 if (DECL_INITIAL (newdecl) == NULL_TREE
1826 && DECL_INITIAL (olddecl) != NULL_TREE)
1828 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1829 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1830 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1832 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1833 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1837 /* Merge the section attribute.
1838 We want to issue an error if the sections conflict but that must be
1839 done later in decl_attributes since we are called before attributes
1841 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1842 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1844 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1846 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1847 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1848 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1849 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1850 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1851 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1852 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1853 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1854 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1855 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1856 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1857 /* Keep the old RTL. */
1858 COPY_DECL_RTL (olddecl, newdecl);
1860 else if (TREE_CODE (newdecl) == VAR_DECL
1861 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1863 /* Keep the old RTL. We cannot keep the old RTL if the old
1864 declaration was for an incomplete object and the new
1865 declaration is not since many attributes of the RTL will
1867 COPY_DECL_RTL (olddecl, newdecl);
1870 /* If cannot merge, then use the new type and qualifiers,
1871 and don't preserve the old rtl. */
1874 /* Clean out any memory we had of the old declaration. */
1875 tree oldstatic = value_member (olddecl, static_aggregates);
1877 TREE_VALUE (oldstatic) = error_mark_node;
1879 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1880 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1881 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1882 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1885 /* Merge the storage class information. */
1886 merge_weak (newdecl, olddecl);
1888 if (DECL_ONE_ONLY (olddecl))
1889 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1891 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1892 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1893 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1894 if (! DECL_EXTERNAL (olddecl))
1895 DECL_EXTERNAL (newdecl) = 0;
1897 new_template_info = NULL_TREE;
1898 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1900 bool new_redefines_gnu_inline = false;
1902 if (new_defines_function
1903 && ((DECL_INTERFACE_KNOWN (olddecl)
1904 && TREE_CODE (olddecl) == FUNCTION_DECL)
1905 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1906 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1907 == FUNCTION_DECL))))
1911 if (TREE_CODE (fn) == TEMPLATE_DECL)
1912 fn = DECL_TEMPLATE_RESULT (olddecl);
1914 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1917 if (!new_redefines_gnu_inline)
1919 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1920 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1921 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1923 DECL_TEMPLATE_INSTANTIATED (newdecl)
1924 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1925 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1927 /* If the OLDDECL is an instantiation and/or specialization,
1928 then the NEWDECL must be too. But, it may not yet be marked
1929 as such if the caller has created NEWDECL, but has not yet
1930 figured out that it is a redeclaration. */
1931 if (!DECL_USE_TEMPLATE (newdecl))
1932 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1934 /* Don't really know how much of the language-specific
1935 values we should copy from old to new. */
1936 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1937 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1938 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1939 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1941 if (LANG_DECL_HAS_MIN (newdecl))
1943 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1944 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1945 if (DECL_TEMPLATE_INFO (newdecl))
1946 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1947 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1949 /* Only functions have these fields. */
1950 if (TREE_CODE (newdecl) == FUNCTION_DECL
1951 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1953 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1954 olddecl_friend = DECL_FRIEND_P (olddecl);
1955 hidden_friend = (DECL_ANTICIPATED (olddecl)
1956 && DECL_HIDDEN_FRIEND_P (olddecl)
1957 && newdecl_is_friend);
1958 DECL_BEFRIENDING_CLASSES (newdecl)
1959 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1960 DECL_BEFRIENDING_CLASSES (olddecl));
1961 /* DECL_THUNKS is only valid for virtual functions,
1962 otherwise it is a DECL_FRIEND_CONTEXT. */
1963 if (DECL_VIRTUAL_P (newdecl))
1964 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1966 /* Only variables have this field. */
1967 else if (TREE_CODE (newdecl) == VAR_DECL
1968 && VAR_HAD_UNKNOWN_BOUND (olddecl))
1969 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
1972 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1976 /* Merge parameter attributes. */
1977 tree oldarg, newarg;
1978 for (oldarg = DECL_ARGUMENTS(olddecl),
1979 newarg = DECL_ARGUMENTS(newdecl);
1981 oldarg = DECL_CHAIN(oldarg), newarg = DECL_CHAIN(newarg)) {
1982 DECL_ATTRIBUTES (newarg)
1983 = (*targetm.merge_decl_attributes) (oldarg, newarg);
1984 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
1987 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1988 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1990 /* If newdecl is not a specialization, then it is not a
1991 template-related function at all. And that means that we
1992 should have exited above, returning 0. */
1993 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1995 if (DECL_ODR_USED (olddecl))
1996 /* From [temp.expl.spec]:
1998 If a template, a member template or the member of a class
1999 template is explicitly specialized then that
2000 specialization shall be declared before the first use of
2001 that specialization that would cause an implicit
2002 instantiation to take place, in every translation unit in
2003 which such a use occurs. */
2004 error ("explicit specialization of %qD after first use",
2007 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
2009 /* Don't propagate visibility from the template to the
2010 specialization here. We'll do that in determine_visibility if
2012 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
2014 /* [temp.expl.spec/14] We don't inline explicit specialization
2015 just because the primary template says so. */
2017 else if (new_defines_function && DECL_INITIAL (olddecl))
2019 /* Never inline re-defined extern inline functions.
2020 FIXME: this could be better handled by keeping both
2021 function as separate declarations. */
2022 DECL_UNINLINABLE (newdecl) = 1;
2026 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
2027 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
2029 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
2031 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2032 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2034 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2035 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2036 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2037 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2040 /* Preserve abstractness on cloned [cd]tors. */
2041 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2043 /* Update newdecl's parms to point at olddecl. */
2044 for (parm = DECL_ARGUMENTS (newdecl); parm;
2045 parm = DECL_CHAIN (parm))
2046 DECL_CONTEXT (parm) = olddecl;
2050 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2051 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2052 COPY_DECL_RTL (newdecl, olddecl);
2054 if (! types_match || new_defines_function)
2056 /* These need to be copied so that the names are available.
2057 Note that if the types do match, we'll preserve inline
2058 info and other bits, but if not, we won't. */
2059 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2060 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2062 if (new_defines_function)
2063 /* If defining a function declared with other language
2064 linkage, use the previously declared language linkage. */
2065 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2066 else if (types_match)
2068 /* If redeclaring a builtin function, and not a definition,
2069 it stays built in. */
2070 if (DECL_BUILT_IN (olddecl))
2072 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2073 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2074 /* If we're keeping the built-in definition, keep the rtl,
2075 regardless of declaration matches. */
2076 COPY_DECL_RTL (olddecl, newdecl);
2079 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2080 /* Don't clear out the arguments if we're just redeclaring a
2082 if (DECL_ARGUMENTS (olddecl))
2083 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2086 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2087 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2089 /* Now preserve various other info from the definition. */
2090 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2091 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2092 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2093 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2095 /* Warn about conflicting visibility specifications. */
2096 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2097 && DECL_VISIBILITY_SPECIFIED (newdecl)
2098 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2100 warning_at (input_location, OPT_Wattributes,
2101 "%q+D: visibility attribute ignored because it", newdecl);
2102 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2103 "conflicts with previous declaration here");
2105 /* Choose the declaration which specified visibility. */
2106 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2108 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2109 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2111 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2112 so keep this behavior. */
2113 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2115 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2116 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2118 /* Likewise for DECL_USER_ALIGN and DECL_PACKED. */
2119 DECL_USER_ALIGN (olddecl) = DECL_USER_ALIGN (newdecl);
2120 if (TREE_CODE (newdecl) == FIELD_DECL)
2121 DECL_PACKED (olddecl) = DECL_PACKED (newdecl);
2123 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2124 with that from NEWDECL below. */
2125 if (DECL_LANG_SPECIFIC (olddecl))
2127 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2128 != DECL_LANG_SPECIFIC (newdecl));
2129 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2132 /* Merge the USED information. */
2133 if (TREE_USED (olddecl))
2134 TREE_USED (newdecl) = 1;
2135 else if (TREE_USED (newdecl))
2136 TREE_USED (olddecl) = 1;
2137 if (TREE_CODE (newdecl) == VAR_DECL)
2139 if (DECL_READ_P (olddecl))
2140 DECL_READ_P (newdecl) = 1;
2141 else if (DECL_READ_P (newdecl))
2142 DECL_READ_P (olddecl) = 1;
2144 if (DECL_PRESERVE_P (olddecl))
2145 DECL_PRESERVE_P (newdecl) = 1;
2146 else if (DECL_PRESERVE_P (newdecl))
2147 DECL_PRESERVE_P (olddecl) = 1;
2149 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2153 function_size = sizeof (struct tree_decl_common);
2155 memcpy ((char *) olddecl + sizeof (struct tree_common),
2156 (char *) newdecl + sizeof (struct tree_common),
2157 function_size - sizeof (struct tree_common));
2159 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2160 (char *) newdecl + sizeof (struct tree_decl_common),
2161 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2162 if (new_template_info)
2163 /* If newdecl is a template instantiation, it is possible that
2164 the following sequence of events has occurred:
2166 o A friend function was declared in a class template. The
2167 class template was instantiated.
2169 o The instantiation of the friend declaration was
2170 recorded on the instantiation list, and is newdecl.
2172 o Later, however, instantiate_class_template called pushdecl
2173 on the newdecl to perform name injection. But, pushdecl in
2174 turn called duplicate_decls when it discovered that another
2175 declaration of a global function with the same name already
2178 o Here, in duplicate_decls, we decided to clobber newdecl.
2180 If we're going to do that, we'd better make sure that
2181 olddecl, and not newdecl, is on the list of
2182 instantiations so that if we try to do the instantiation
2183 again we won't get the clobbered declaration. */
2184 reregister_specialization (newdecl,
2190 size_t size = tree_code_size (TREE_CODE (olddecl));
2191 memcpy ((char *) olddecl + sizeof (struct tree_common),
2192 (char *) newdecl + sizeof (struct tree_common),
2193 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2194 switch (TREE_CODE (olddecl))
2204 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2205 (char *) newdecl + sizeof (struct tree_decl_common),
2206 size - sizeof (struct tree_decl_common)
2207 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2211 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2212 (char *) newdecl + sizeof (struct tree_decl_common),
2213 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2214 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2218 DECL_UID (olddecl) = olddecl_uid;
2220 DECL_FRIEND_P (olddecl) = 1;
2223 DECL_ANTICIPATED (olddecl) = 1;
2224 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2227 /* NEWDECL contains the merged attribute lists.
2228 Update OLDDECL to be the same. */
2229 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2231 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2232 so that encode_section_info has a chance to look at the new decl
2233 flags and attributes. */
2234 if (DECL_RTL_SET_P (olddecl)
2235 && (TREE_CODE (olddecl) == FUNCTION_DECL
2236 || (TREE_CODE (olddecl) == VAR_DECL
2237 && TREE_STATIC (olddecl))))
2238 make_decl_rtl (olddecl);
2240 /* The NEWDECL will no longer be needed. Because every out-of-class
2241 declaration of a member results in a call to duplicate_decls,
2242 freeing these nodes represents in a significant savings. */
2248 /* Return zero if the declaration NEWDECL is valid
2249 when the declaration OLDDECL (assumed to be for the same name)
2250 has already been seen.
2251 Otherwise return an error message format string with a %s
2252 where the identifier should go. */
2255 redeclaration_error_message (tree newdecl, tree olddecl)
2257 if (TREE_CODE (newdecl) == TYPE_DECL)
2259 /* Because C++ can put things into name space for free,
2260 constructs like "typedef struct foo { ... } foo"
2261 would look like an erroneous redeclaration. */
2262 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2265 return G_("redefinition of %q#D");
2267 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2269 /* If this is a pure function, its olddecl will actually be
2270 the original initialization to `0' (which we force to call
2271 abort()). Don't complain about redefinition in this case. */
2272 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2273 && DECL_INITIAL (olddecl) == NULL_TREE)
2276 /* If both functions come from different namespaces, this is not
2277 a redeclaration - this is a conflict with a used function. */
2278 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2279 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2280 && ! decls_match (olddecl, newdecl))
2281 return G_("%qD conflicts with used function");
2283 /* We'll complain about linkage mismatches in
2284 warn_extern_redeclared_static. */
2286 /* Defining the same name twice is no good. */
2287 if (DECL_INITIAL (olddecl) != NULL_TREE
2288 && DECL_INITIAL (newdecl) != NULL_TREE)
2290 if (DECL_NAME (olddecl) == NULL_TREE)
2291 return G_("%q#D not declared in class");
2292 else if (!GNU_INLINE_P (olddecl)
2293 || GNU_INLINE_P (newdecl))
2294 return G_("redefinition of %q#D");
2297 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2299 bool olda = GNU_INLINE_P (olddecl);
2300 bool newa = GNU_INLINE_P (newdecl);
2305 return G_("%q+D redeclared inline with "
2306 "%<gnu_inline%> attribute");
2308 return G_("%q+D redeclared inline without "
2309 "%<gnu_inline%> attribute");
2315 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2319 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2321 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2322 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2323 return G_("redefinition of %q#D");
2327 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2328 || (DECL_TEMPLATE_RESULT (newdecl)
2329 == DECL_TEMPLATE_RESULT (olddecl)))
2332 nt = DECL_TEMPLATE_RESULT (newdecl);
2333 if (DECL_TEMPLATE_INFO (nt))
2334 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2335 ot = DECL_TEMPLATE_RESULT (olddecl);
2336 if (DECL_TEMPLATE_INFO (ot))
2337 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2338 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2339 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2340 return G_("redefinition of %q#D");
2342 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2344 bool olda = GNU_INLINE_P (ot);
2345 bool newa = GNU_INLINE_P (nt);
2350 return G_("%q+D redeclared inline with "
2351 "%<gnu_inline%> attribute");
2353 return G_("%q+D redeclared inline without "
2354 "%<gnu_inline%> attribute");
2358 /* Core issue #226 (C++0x):
2360 If a friend function template declaration specifies a
2361 default template-argument, that declaration shall be a
2362 definition and shall be the only declaration of the
2363 function template in the translation unit. */
2364 if ((cxx_dialect != cxx98)
2365 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2366 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2367 /*is_primary=*/1, /*is_partial=*/0,
2368 /*is_friend_decl=*/2))
2369 return G_("redeclaration of friend %q#D "
2370 "may not have default template arguments");
2374 else if (TREE_CODE (newdecl) == VAR_DECL
2375 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2376 && (! DECL_LANG_SPECIFIC (olddecl)
2377 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2378 || DECL_THREAD_LOCAL_P (newdecl)))
2380 /* Only variables can be thread-local, and all declarations must
2381 agree on this property. */
2382 if (DECL_THREAD_LOCAL_P (newdecl))
2383 return G_("thread-local declaration of %q#D follows "
2384 "non-thread-local declaration");
2386 return G_("non-thread-local declaration of %q#D follows "
2387 "thread-local declaration");
2389 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2391 /* The objects have been declared at namespace scope. If either
2392 is a member of an anonymous union, then this is an invalid
2393 redeclaration. For example:
2399 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2400 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2401 return G_("redeclaration of %q#D");
2402 /* If at least one declaration is a reference, there is no
2403 conflict. For example:
2409 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2411 /* Reject two definitions. */
2412 return G_("redefinition of %q#D");
2416 /* Objects declared with block scope: */
2417 /* Reject two definitions, and reject a definition
2418 together with an external reference. */
2419 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2420 return G_("redeclaration of %q#D");
2425 /* Hash and equality functions for the named_label table. */
2428 named_label_entry_hash (const void *data)
2430 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2431 return DECL_UID (ent->label_decl);
2435 named_label_entry_eq (const void *a, const void *b)
2437 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2438 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2439 return ent_a->label_decl == ent_b->label_decl;
2442 /* Create a new label, named ID. */
2445 make_label_decl (tree id, int local_p)
2447 struct named_label_entry *ent;
2451 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2453 DECL_CONTEXT (decl) = current_function_decl;
2454 DECL_MODE (decl) = VOIDmode;
2455 C_DECLARED_LABEL_FLAG (decl) = local_p;
2457 /* Say where one reference is to the label, for the sake of the
2458 error if it is not defined. */
2459 DECL_SOURCE_LOCATION (decl) = input_location;
2461 /* Record the fact that this identifier is bound to this label. */
2462 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2464 /* Create the label htab for the function on demand. */
2466 named_labels = htab_create_ggc (13, named_label_entry_hash,
2467 named_label_entry_eq, NULL);
2469 /* Record this label on the list of labels used in this function.
2470 We do this before calling make_label_decl so that we get the
2471 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2472 ent = ggc_alloc_cleared_named_label_entry ();
2473 ent->label_decl = decl;
2475 slot = htab_find_slot (named_labels, ent, INSERT);
2476 gcc_assert (*slot == NULL);
2482 /* Look for a label named ID in the current function. If one cannot
2483 be found, create one. (We keep track of used, but undefined,
2484 labels, and complain about them at the end of a function.) */
2487 lookup_label (tree id)
2491 timevar_push (TV_NAME_LOOKUP);
2492 /* You can't use labels at global scope. */
2493 if (current_function_decl == NULL_TREE)
2495 error ("label %qE referenced outside of any function", id);
2496 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2499 /* See if we've already got this label. */
2500 decl = IDENTIFIER_LABEL_VALUE (id);
2501 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2502 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2504 decl = make_label_decl (id, /*local_p=*/0);
2505 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2508 /* Declare a local label named ID. */
2511 declare_local_label (tree id)
2514 cp_label_binding *bind;
2516 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2517 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2518 bind = VEC_safe_push (cp_label_binding, gc,
2519 current_binding_level->shadowed_labels, NULL);
2520 bind->prev_value = IDENTIFIER_LABEL_VALUE (id);
2522 decl = make_label_decl (id, /*local_p=*/1);
2528 /* Returns nonzero if it is ill-formed to jump past the declaration of
2529 DECL. Returns 2 if it's also a real problem. */
2532 decl_jump_unsafe (tree decl)
2534 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2535 with automatic storage duration is not in scope to a point where it is
2536 in scope is ill-formed unless the variable has scalar type, class type
2537 with a trivial default constructor and a trivial destructor, a
2538 cv-qualified version of one of these types, or an array of one of the
2539 preceding types and is declared without an initializer (8.5). */
2540 tree type = TREE_TYPE (decl);
2542 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2543 || type == error_mark_node)
2546 type = strip_array_types (type);
2548 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2549 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2552 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2558 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2561 identify_goto (tree decl, const location_t *locus)
2564 permerror (input_location, "jump to label %qD", decl);
2566 permerror (input_location, "jump to case label");
2568 permerror (*locus, " from here");
2571 /* Check that a single previously seen jump to a newly defined label
2572 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2573 the jump context; NAMES are the names in scope in LEVEL at the jump
2574 context; LOCUS is the source position of the jump or 0. Returns
2575 true if all is well. */
2578 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2579 bool exited_omp, const location_t *locus)
2581 struct cp_binding_level *b;
2582 bool identified = false, saw_eh = false, saw_omp = false;
2586 identify_goto (decl, locus);
2587 error (" exits OpenMP structured block");
2588 identified = saw_omp = true;
2591 for (b = current_binding_level; b ; b = b->level_chain)
2593 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2595 for (new_decls = b->names; new_decls != old_decls;
2596 new_decls = DECL_CHAIN (new_decls))
2598 int problem = decl_jump_unsafe (new_decls);
2604 identify_goto (decl, locus);
2608 error (" crosses initialization of %q+#D", new_decls);
2610 permerror (input_location, " enters scope of %q+#D which has "
2611 "non-trivial destructor", new_decls);
2616 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2620 identify_goto (decl, locus);
2623 if (b->kind == sk_try)
2624 error (" enters try block");
2626 error (" enters catch block");
2629 if (b->kind == sk_omp && !saw_omp)
2633 identify_goto (decl, locus);
2636 error (" enters OpenMP structured block");
2645 check_previous_goto (tree decl, struct named_label_use_entry *use)
2647 check_previous_goto_1 (decl, use->binding_level,
2648 use->names_in_scope, use->in_omp_scope,
2649 &use->o_goto_locus);
2653 check_switch_goto (struct cp_binding_level* level)
2655 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2658 /* Check that a new jump to a label DECL is OK. Called by
2659 finish_goto_stmt. */
2662 check_goto (tree decl)
2664 struct named_label_entry *ent, dummy;
2665 bool saw_catch = false, identified = false;
2669 /* We can't know where a computed goto is jumping.
2670 So we assume that it's OK. */
2671 if (TREE_CODE (decl) != LABEL_DECL)
2674 /* We didn't record any information about this label when we created it,
2675 and there's not much point since it's trivial to analyze as a return. */
2676 if (decl == cdtor_label)
2679 dummy.label_decl = decl;
2680 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2681 gcc_assert (ent != NULL);
2683 /* If the label hasn't been defined yet, defer checking. */
2684 if (! DECL_INITIAL (decl))
2686 struct named_label_use_entry *new_use;
2688 /* Don't bother creating another use if the last goto had the
2689 same data, and will therefore create the same set of errors. */
2691 && ent->uses->names_in_scope == current_binding_level->names)
2694 new_use = ggc_alloc_named_label_use_entry ();
2695 new_use->binding_level = current_binding_level;
2696 new_use->names_in_scope = current_binding_level->names;
2697 new_use->o_goto_locus = input_location;
2698 new_use->in_omp_scope = false;
2700 new_use->next = ent->uses;
2701 ent->uses = new_use;
2705 if (ent->in_try_scope || ent->in_catch_scope
2706 || ent->in_omp_scope || !VEC_empty (tree, ent->bad_decls))
2708 permerror (input_location, "jump to label %q+D", decl);
2709 permerror (input_location, " from here");
2713 FOR_EACH_VEC_ELT (tree, ent->bad_decls, ix, bad)
2715 int u = decl_jump_unsafe (bad);
2717 if (u > 1 && DECL_ARTIFICIAL (bad))
2719 /* Can't skip init of __exception_info. */
2720 error_at (DECL_SOURCE_LOCATION (bad), " enters catch block");
2724 error (" skips initialization of %q+#D", bad);
2726 permerror (input_location, " enters scope of %q+#D which has "
2727 "non-trivial destructor", bad);
2730 if (ent->in_try_scope)
2731 error (" enters try block");
2732 else if (ent->in_catch_scope && !saw_catch)
2733 error (" enters catch block");
2735 if (ent->in_omp_scope)
2736 error (" enters OpenMP structured block");
2737 else if (flag_openmp)
2739 struct cp_binding_level *b;
2740 for (b = current_binding_level; b ; b = b->level_chain)
2742 if (b == ent->binding_level)
2744 if (b->kind == sk_omp)
2748 permerror (input_location, "jump to label %q+D", decl);
2749 permerror (input_location, " from here");
2752 error (" exits OpenMP structured block");
2759 /* Check that a return is ok wrt OpenMP structured blocks.
2760 Called by finish_return_stmt. Returns true if all is well. */
2763 check_omp_return (void)
2765 struct cp_binding_level *b;
2766 for (b = current_binding_level; b ; b = b->level_chain)
2767 if (b->kind == sk_omp)
2769 error ("invalid exit from OpenMP structured block");
2775 /* Define a label, specifying the location in the source file.
2776 Return the LABEL_DECL node for the label. */
2779 define_label (location_t location, tree name)
2781 struct named_label_entry *ent, dummy;
2782 struct cp_binding_level *p;
2785 timevar_push (TV_NAME_LOOKUP);
2787 decl = lookup_label (name);
2789 dummy.label_decl = decl;
2790 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2791 gcc_assert (ent != NULL);
2793 /* After labels, make any new cleanups in the function go into their
2794 own new (temporary) binding contour. */
2795 for (p = current_binding_level;
2796 p->kind != sk_function_parms;
2798 p->more_cleanups_ok = 0;
2800 if (name == get_identifier ("wchar_t"))
2801 permerror (input_location, "label named wchar_t");
2803 if (DECL_INITIAL (decl) != NULL_TREE)
2805 error ("duplicate label %qD", decl);
2806 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2810 struct named_label_use_entry *use;
2812 /* Mark label as having been defined. */
2813 DECL_INITIAL (decl) = error_mark_node;
2814 /* Say where in the source. */
2815 DECL_SOURCE_LOCATION (decl) = location;
2817 ent->binding_level = current_binding_level;
2818 ent->names_in_scope = current_binding_level->names;
2820 for (use = ent->uses; use ; use = use->next)
2821 check_previous_goto (decl, use);
2825 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2830 struct cp_binding_level *level;
2831 struct cp_switch *next;
2832 /* The SWITCH_STMT being built. */
2834 /* A splay-tree mapping the low element of a case range to the high
2835 element, or NULL_TREE if there is no high element. Used to
2836 determine whether or not a new case label duplicates an old case
2837 label. We need a tree, rather than simply a hash table, because
2838 of the GNU case range extension. */
2842 /* A stack of the currently active switch statements. The innermost
2843 switch statement is on the top of the stack. There is no need to
2844 mark the stack for garbage collection because it is only active
2845 during the processing of the body of a function, and we never
2846 collect at that point. */
2848 static struct cp_switch *switch_stack;
2850 /* Called right after a switch-statement condition is parsed.
2851 SWITCH_STMT is the switch statement being parsed. */
2854 push_switch (tree switch_stmt)
2856 struct cp_switch *p = XNEW (struct cp_switch);
2857 p->level = current_binding_level;
2858 p->next = switch_stack;
2859 p->switch_stmt = switch_stmt;
2860 p->cases = splay_tree_new (case_compare, NULL, NULL);
2867 struct cp_switch *cs = switch_stack;
2868 location_t switch_location;
2870 /* Emit warnings as needed. */
2871 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2872 switch_location = EXPR_LOCATION (cs->switch_stmt);
2874 switch_location = input_location;
2875 if (!processing_template_decl)
2876 c_do_switch_warnings (cs->cases, switch_location,
2877 SWITCH_STMT_TYPE (cs->switch_stmt),
2878 SWITCH_STMT_COND (cs->switch_stmt));
2880 splay_tree_delete (cs->cases);
2881 switch_stack = switch_stack->next;
2885 /* Note that we've seen a definition of a case label, and complain if this
2886 is a bad place for one. */
2889 finish_case_label (location_t loc, tree low_value, tree high_value)
2892 struct cp_binding_level *p;
2894 if (processing_template_decl)
2898 /* For templates, just add the case label; we'll do semantic
2899 analysis at instantiation-time. */
2900 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2901 return add_stmt (build_case_label (loc, low_value, high_value, label));
2904 /* Find the condition on which this switch statement depends. */
2905 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2906 if (cond && TREE_CODE (cond) == TREE_LIST)
2907 cond = TREE_VALUE (cond);
2909 if (!check_switch_goto (switch_stack->level))
2910 return error_mark_node;
2912 r = c_add_case_label (loc, switch_stack->cases, cond,
2913 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2914 low_value, high_value);
2916 /* After labels, make any new cleanups in the function go into their
2917 own new (temporary) binding contour. */
2918 for (p = current_binding_level;
2919 p->kind != sk_function_parms;
2921 p->more_cleanups_ok = 0;
2926 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2929 typename_hash (const void* k)
2932 const_tree const t = (const_tree) k;
2934 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2935 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2940 typedef struct typename_info {
2948 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2949 really of type `typename_info*' */
2952 typename_compare (const void * k1, const void * k2)
2954 const_tree const t1 = (const_tree) k1;
2955 const typename_info *const t2 = (const typename_info *) k2;
2957 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2958 && TYPE_CONTEXT (t1) == t2->scope
2959 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2960 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2961 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2964 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2965 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2967 Returns the new TYPENAME_TYPE. */
2969 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2972 build_typename_type (tree context, tree name, tree fullname,
2973 enum tag_types tag_type)
2981 if (typename_htab == NULL)
2982 typename_htab = htab_create_ggc (61, &typename_hash,
2983 &typename_compare, NULL);
2985 ti.scope = FROB_CONTEXT (context);
2987 ti.template_id = fullname;
2988 ti.enum_p = tag_type == enum_type;
2989 ti.class_p = (tag_type == class_type
2990 || tag_type == record_type
2991 || tag_type == union_type);
2992 hash = (htab_hash_pointer (ti.scope)
2993 ^ htab_hash_pointer (ti.name));
2995 /* See if we already have this type. */
2996 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
3001 /* Build the TYPENAME_TYPE. */
3002 t = cxx_make_type (TYPENAME_TYPE);
3003 TYPE_CONTEXT (t) = ti.scope;
3004 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
3005 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
3006 TYPENAME_IS_CLASS_P (t) = ti.class_p;
3008 /* Build the corresponding TYPE_DECL. */
3009 d = build_decl (input_location, TYPE_DECL, name, t);
3010 TYPE_NAME (TREE_TYPE (d)) = d;
3011 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3012 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3013 DECL_ARTIFICIAL (d) = 1;
3015 /* Store it in the hash table. */
3018 /* TYPENAME_TYPEs must always be compared structurally, because
3019 they may or may not resolve down to another type depending on
3020 the currently open classes. */
3021 SET_TYPE_STRUCTURAL_EQUALITY (t);
3027 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
3028 provided to name the type. Returns an appropriate type, unless an
3029 error occurs, in which case error_mark_node is returned. If we
3030 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
3031 return that, rather than the _TYPE it corresponds to, in other
3032 cases we look through the type decl. If TF_ERROR is set, complain
3033 about errors, otherwise be quiet. */
3036 make_typename_type (tree context, tree name, enum tag_types tag_type,
3037 tsubst_flags_t complain)
3043 if (name == error_mark_node
3044 || context == NULL_TREE
3045 || context == error_mark_node)
3046 return error_mark_node;
3050 if (!(TYPE_LANG_SPECIFIC (name)
3051 && (CLASSTYPE_IS_TEMPLATE (name)
3052 || CLASSTYPE_USE_TEMPLATE (name))))
3053 name = TYPE_IDENTIFIER (name);
3055 /* Create a TEMPLATE_ID_EXPR for the type. */
3056 name = build_nt (TEMPLATE_ID_EXPR,
3057 CLASSTYPE_TI_TEMPLATE (name),
3058 CLASSTYPE_TI_ARGS (name));
3060 else if (TREE_CODE (name) == TYPE_DECL)
3061 name = DECL_NAME (name);
3065 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3067 name = TREE_OPERAND (name, 0);
3068 if (TREE_CODE (name) == TEMPLATE_DECL)
3069 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3070 else if (TREE_CODE (name) == OVERLOAD)
3072 error ("%qD is not a type", name);
3073 return error_mark_node;
3076 if (TREE_CODE (name) == TEMPLATE_DECL)
3078 error ("%qD used without template parameters", name);
3079 return error_mark_node;
3081 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3082 gcc_assert (TYPE_P (context));
3084 if (!MAYBE_CLASS_TYPE_P (context))
3086 if (complain & tf_error)
3087 error ("%q#T is not a class", context);
3088 return error_mark_node;
3091 /* When the CONTEXT is a dependent type, NAME could refer to a
3092 dependent base class of CONTEXT. But look inside it anyway
3093 if CONTEXT is a currently open scope, in case it refers to a
3094 member of the current instantiation or a non-dependent base;
3095 lookup will stop when we hit a dependent base. */
3096 if (!dependent_scope_p (context))
3097 /* We should only set WANT_TYPE when we're a nested typename type.
3098 Then we can give better diagnostics if we find a non-type. */
3099 t = lookup_field (context, name, 2, /*want_type=*/true);
3103 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3104 return build_typename_type (context, name, fullname, tag_type);
3106 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3110 if (complain & tf_error)
3111 error (want_template ? "no class template named %q#T in %q#T"
3112 : "no type named %q#T in %q#T", name, context);
3113 return error_mark_node;
3116 /* Pull out the template from an injected-class-name (or multiple). */
3118 t = maybe_get_template_decl_from_type_decl (t);
3120 if (TREE_CODE (t) == TREE_LIST)
3122 if (complain & tf_error)
3124 error ("lookup of %qT in %qT is ambiguous", name, context);
3125 print_candidates (t);
3127 return error_mark_node;
3130 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3132 if (complain & tf_error)
3133 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3135 return error_mark_node;
3137 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3139 if (complain & tf_error)
3140 error ("%<typename %T::%D%> names %q#T, which is not a type",
3142 return error_mark_node;
3145 if (complain & tf_error)
3146 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3148 /* If we are currently parsing a template and if T is a typedef accessed
3149 through CONTEXT then we need to remember and check access of T at
3150 template instantiation time. */
3151 add_typedef_to_current_template_for_access_check (t, context, input_location);
3154 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3156 /*entering_scope=*/0,
3157 tf_warning_or_error | tf_user);
3159 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3165 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3166 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3167 in which case error_mark_node is returned.
3169 If PARM_LIST is non-NULL, also make sure that the template parameter
3170 list of TEMPLATE_DECL matches.
3172 If COMPLAIN zero, don't complain about any errors that occur. */
3175 make_unbound_class_template (tree context, tree name, tree parm_list,
3176 tsubst_flags_t complain)
3182 name = TYPE_IDENTIFIER (name);
3183 else if (DECL_P (name))
3184 name = DECL_NAME (name);
3185 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3187 if (!dependent_type_p (context)
3188 || currently_open_class (context))
3190 tree tmpl = NULL_TREE;
3192 if (MAYBE_CLASS_TYPE_P (context))
3193 tmpl = lookup_field (context, name, 0, false);
3195 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3197 if (complain & tf_error)
3198 error ("no class template named %q#T in %q#T", name, context);
3199 return error_mark_node;
3203 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3205 if (complain & tf_error)
3207 error ("template parameters do not match template");
3208 error ("%q+D declared here", tmpl);
3210 return error_mark_node;
3213 if (complain & tf_error)
3214 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3219 /* Build the UNBOUND_CLASS_TEMPLATE. */
3220 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3221 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3222 TREE_TYPE (t) = NULL_TREE;
3223 SET_TYPE_STRUCTURAL_EQUALITY (t);
3225 /* Build the corresponding TEMPLATE_DECL. */
3226 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3227 TYPE_NAME (TREE_TYPE (d)) = d;
3228 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3229 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3230 DECL_ARTIFICIAL (d) = 1;
3231 DECL_TEMPLATE_PARMS (d) = parm_list;
3238 /* Push the declarations of builtin types into the namespace.
3239 RID_INDEX is the index of the builtin type in the array
3240 RID_POINTERS. NAME is the name used when looking up the builtin
3241 type. TYPE is the _TYPE node for the builtin type. */
3244 record_builtin_type (enum rid rid_index,
3248 tree rname = NULL_TREE, tname = NULL_TREE;
3249 tree tdecl = NULL_TREE;
3251 if ((int) rid_index < (int) RID_MAX)
3252 rname = ridpointers[(int) rid_index];
3254 tname = get_identifier (name);
3256 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3257 eliminated. Built-in types should not be looked up name; their
3258 names are keywords that the parser can recognize. However, there
3259 is code in c-common.c that uses identifier_global_value to look
3260 up built-in types by name. */
3263 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3264 DECL_ARTIFICIAL (tdecl) = 1;
3265 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3271 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3272 DECL_ARTIFICIAL (tdecl) = 1;
3274 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3277 if (!TYPE_NAME (type))
3278 TYPE_NAME (type) = tdecl;
3281 debug_hooks->type_decl (tdecl, 0);
3284 /* Record one of the standard Java types.
3285 * Declare it as having the given NAME.
3286 * If SIZE > 0, it is the size of one of the integral types;
3287 * otherwise it is the negative of the size of one of the other types. */
3290 record_builtin_java_type (const char* name, int size)
3294 type = build_nonstandard_integer_type (size, 0);
3295 else if (size > -32)
3298 /* "__java_char" or ""__java_boolean". */
3299 type = build_nonstandard_integer_type (-size, 1);
3300 /* Get the signed type cached and attached to the unsigned type,
3301 so it doesn't get garbage-collected at "random" times,
3302 causing potential codegen differences out of different UIDs
3303 and different alias set numbers. */
3304 stype = build_nonstandard_integer_type (-size, 0);
3305 TREE_CHAIN (type) = stype;
3306 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3309 { /* "__java_float" or ""__java_double". */
3310 type = make_node (REAL_TYPE);
3311 TYPE_PRECISION (type) = - size;
3314 record_builtin_type (RID_MAX, name, type);
3315 decl = TYPE_NAME (type);
3317 /* Suppress generate debug symbol entries for these types,
3318 since for normal C++ they are just clutter.
3319 However, push_lang_context undoes this if extern "Java" is seen. */
3320 DECL_IGNORED_P (decl) = 1;
3322 TYPE_FOR_JAVA (type) = 1;
3326 /* Push a type into the namespace so that the back ends ignore it. */
3329 record_unknown_type (tree type, const char* name)
3331 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3332 TYPE_DECL, get_identifier (name), type));
3333 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3334 DECL_IGNORED_P (decl) = 1;
3335 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3336 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3337 TYPE_ALIGN (type) = 1;
3338 TYPE_USER_ALIGN (type) = 0;
3339 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3342 /* A string for which we should create an IDENTIFIER_NODE at
3345 typedef struct predefined_identifier
3347 /* The name of the identifier. */
3348 const char *const name;
3349 /* The place where the IDENTIFIER_NODE should be stored. */
3351 /* Nonzero if this is the name of a constructor or destructor. */
3352 const int ctor_or_dtor_p;
3353 } predefined_identifier;
3355 /* Create all the predefined identifiers. */
3358 initialize_predefined_identifiers (void)
3360 const predefined_identifier *pid;
3362 /* A table of identifiers to create at startup. */
3363 static const predefined_identifier predefined_identifiers[] = {
3364 { "C++", &lang_name_cplusplus, 0 },
3365 { "C", &lang_name_c, 0 },
3366 { "Java", &lang_name_java, 0 },
3367 /* Some of these names have a trailing space so that it is
3368 impossible for them to conflict with names written by users. */
3369 { "__ct ", &ctor_identifier, 1 },
3370 { "__base_ctor ", &base_ctor_identifier, 1 },
3371 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3372 { "__dt ", &dtor_identifier, 1 },
3373 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3374 { "__base_dtor ", &base_dtor_identifier, 1 },
3375 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3376 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3377 { "nelts", &nelts_identifier, 0 },
3378 { THIS_NAME, &this_identifier, 0 },
3379 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3380 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3381 { "_vptr", &vptr_identifier, 0 },
3382 { "__vtt_parm", &vtt_parm_identifier, 0 },
3383 { "::", &global_scope_name, 0 },
3384 { "std", &std_identifier, 0 },
3388 for (pid = predefined_identifiers; pid->name; ++pid)
3390 *pid->node = get_identifier (pid->name);
3391 if (pid->ctor_or_dtor_p)
3392 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3396 /* Create the predefined scalar types of C,
3397 and some nodes representing standard constants (0, 1, (void *)0).
3398 Initialize the global binding level.
3399 Make definitions for built-in primitive functions. */
3402 cxx_init_decl_processing (void)
3405 tree void_ftype_ptr;
3407 build_common_tree_nodes (flag_signed_char);
3409 /* Create all the identifiers we need. */
3410 initialize_predefined_identifiers ();
3412 /* Create the global variables. */
3413 push_to_top_level ();
3415 current_function_decl = NULL_TREE;
3416 current_binding_level = NULL;
3417 /* Enter the global namespace. */
3418 gcc_assert (global_namespace == NULL_TREE);
3419 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3421 DECL_CONTEXT (global_namespace) = build_translation_unit_decl (NULL_TREE);
3422 TREE_PUBLIC (global_namespace) = 1;
3423 begin_scope (sk_namespace, global_namespace);
3425 current_lang_name = NULL_TREE;
3427 if (flag_visibility_ms_compat)
3428 default_visibility = VISIBILITY_HIDDEN;
3431 current_lang_name = lang_name_c;
3433 /* Create the `std' namespace. */
3434 push_namespace (std_identifier);
3435 std_node = current_namespace;
3438 c_common_nodes_and_builtins ();
3440 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3441 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3442 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3443 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3444 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3445 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3446 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3447 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3449 integer_two_node = build_int_cst (NULL_TREE, 2);
3451 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3452 truthvalue_type_node = boolean_type_node;
3453 truthvalue_false_node = boolean_false_node;
3454 truthvalue_true_node = boolean_true_node;
3456 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3457 noexcept_true_spec = build_tree_list (boolean_true_node, NULL_TREE);
3458 noexcept_false_spec = build_tree_list (boolean_false_node, NULL_TREE);
3461 record_builtin_type (RID_MAX, NULL, string_type_node);
3464 delta_type_node = ptrdiff_type_node;
3465 vtable_index_type = ptrdiff_type_node;
3467 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3468 void_ftype = build_function_type_list (void_type_node, NULL_TREE);
3469 void_ftype_ptr = build_function_type_list (void_type_node,
3470 ptr_type_node, NULL_TREE);
3472 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3474 /* C++ extensions */
3476 unknown_type_node = make_node (LANG_TYPE);
3477 record_unknown_type (unknown_type_node, "unknown type");
3479 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3480 TREE_TYPE (unknown_type_node) = unknown_type_node;
3482 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3484 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3485 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3487 init_list_type_node = make_node (LANG_TYPE);
3488 record_unknown_type (init_list_type_node, "init list");
3491 /* Make sure we get a unique function type, so we can give
3492 its pointer type a name. (This wins for gdb.) */
3493 tree vfunc_type = make_node (FUNCTION_TYPE);
3494 TREE_TYPE (vfunc_type) = integer_type_node;
3495 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3496 layout_type (vfunc_type);
3498 vtable_entry_type = build_pointer_type (vfunc_type);
3500 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3503 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3504 layout_type (vtbl_type_node);
3505 vtbl_type_node = cp_build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3506 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3507 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3508 layout_type (vtbl_ptr_type_node);
3509 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3511 push_namespace (get_identifier ("__cxxabiv1"));
3512 abi_node = current_namespace;
3515 global_type_node = make_node (LANG_TYPE);
3516 record_unknown_type (global_type_node, "global type");
3519 current_lang_name = lang_name_cplusplus;
3522 tree newtype, deltype;
3523 tree ptr_ftype_sizetype;
3527 = build_function_type_list (ptr_type_node, size_type_node, NULL_TREE);
3528 if (cxx_dialect == cxx98)
3531 tree bad_alloc_type_node;
3532 tree bad_alloc_decl;
3534 push_namespace (std_identifier);
3535 bad_alloc_id = get_identifier ("bad_alloc");
3536 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3537 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3539 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3540 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3544 = add_exception_specifier (NULL_TREE, bad_alloc_type_node, -1);
3547 new_eh_spec = noexcept_false_spec;
3549 newtype = build_exception_variant (ptr_ftype_sizetype, new_eh_spec);
3550 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3551 push_cp_library_fn (NEW_EXPR, newtype);
3552 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3553 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3554 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3556 nullptr_type_node = make_node (NULLPTR_TYPE);
3557 TYPE_SIZE (nullptr_type_node) = bitsize_int (GET_MODE_BITSIZE (ptr_mode));
3558 TYPE_SIZE_UNIT (nullptr_type_node) = size_int (GET_MODE_SIZE (ptr_mode));
3559 TYPE_UNSIGNED (nullptr_type_node) = 1;
3560 TYPE_PRECISION (nullptr_type_node) = GET_MODE_BITSIZE (ptr_mode);
3561 SET_TYPE_MODE (nullptr_type_node, Pmode);
3562 record_builtin_type (RID_MAX, "decltype(nullptr)", nullptr_type_node);
3563 nullptr_node = build_int_cst (nullptr_type_node, 0);
3567 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3569 /* Perform other language dependent initializations. */
3570 init_class_processing ();
3571 init_rtti_processing ();
3572 init_template_processing ();
3574 if (flag_exceptions)
3575 init_exception_processing ();
3577 if (! supports_one_only ())
3580 make_fname_decl = cp_make_fname_decl;
3581 start_fname_decls ();
3583 /* Show we use EH for cleanups. */
3584 if (flag_exceptions)
3585 using_eh_for_cleanups ();
3588 /* Generate an initializer for a function naming variable from
3589 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3590 filled in with the type of the init. */
3593 cp_fname_init (const char* name, tree *type_p)
3595 tree domain = NULL_TREE;
3597 tree init = NULL_TREE;
3602 length = strlen (name);
3603 domain = build_index_type (size_int (length));
3604 init = build_string (length + 1, name);
3607 type = cp_build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3608 type = build_cplus_array_type (type, domain);
3613 TREE_TYPE (init) = type;
3615 init = error_mark_node;
3620 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3621 the decl, LOC is the location to give the decl, NAME is the
3622 initialization string and TYPE_DEP indicates whether NAME depended
3623 on the type of the function. We make use of that to detect
3624 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3625 at the point of first use, so we mustn't push the decl now. */
3628 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3630 const char *const name = (type_dep && processing_template_decl
3631 ? NULL : fname_as_string (type_dep));
3633 tree init = cp_fname_init (name, &type);
3634 tree decl = build_decl (loc, VAR_DECL, id, type);
3637 free (CONST_CAST (char *, name));
3639 /* As we're using pushdecl_with_scope, we must set the context. */
3640 DECL_CONTEXT (decl) = current_function_decl;
3641 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3643 TREE_STATIC (decl) = 1;
3644 TREE_READONLY (decl) = 1;
3645 DECL_ARTIFICIAL (decl) = 1;
3647 TREE_USED (decl) = 1;
3649 if (current_function_decl)
3651 struct cp_binding_level *b = current_binding_level;
3652 while (b->level_chain->kind != sk_function_parms)
3654 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3655 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3656 LOOKUP_ONLYCONVERTING);
3659 pushdecl_top_level_and_finish (decl, init);
3665 builtin_function_1 (tree decl, tree context, bool is_global)
3667 tree id = DECL_NAME (decl);
3668 const char *name = IDENTIFIER_POINTER (id);
3670 retrofit_lang_decl (decl);
3672 DECL_ARTIFICIAL (decl) = 1;
3673 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3674 SET_DECL_LANGUAGE (decl, lang_c);
3675 /* Runtime library routines are, by definition, available in an
3676 external shared object. */
3677 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3678 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3680 DECL_CONTEXT (decl) = context;
3683 pushdecl_top_level (decl);
3687 /* A function in the user's namespace should have an explicit
3688 declaration before it is used. Mark the built-in function as
3689 anticipated but not actually declared. */
3690 if (name[0] != '_' || name[1] != '_')
3691 DECL_ANTICIPATED (decl) = 1;
3692 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3694 size_t len = strlen (name);
3696 /* Treat __*_chk fortification functions as anticipated as well,
3697 unless they are __builtin_*. */
3698 if (len > strlen ("___chk")
3699 && memcmp (name + len - strlen ("_chk"),
3700 "_chk", strlen ("_chk") + 1) == 0)
3701 DECL_ANTICIPATED (decl) = 1;
3708 cxx_builtin_function (tree decl)
3710 tree id = DECL_NAME (decl);
3711 const char *name = IDENTIFIER_POINTER (id);
3712 /* All builtins that don't begin with an '_' should additionally
3713 go in the 'std' namespace. */
3716 tree decl2 = copy_node(decl);
3717 push_namespace (std_identifier);
3718 builtin_function_1 (decl2, std_node, false);
3722 return builtin_function_1 (decl, NULL_TREE, false);
3725 /* Like cxx_builtin_function, but guarantee the function is added to the global
3726 scope. This is to allow function specific options to add new machine
3727 dependent builtins when the target ISA changes via attribute((target(...)))
3728 which saves space on program startup if the program does not use non-generic
3732 cxx_builtin_function_ext_scope (tree decl)
3735 tree id = DECL_NAME (decl);
3736 const char *name = IDENTIFIER_POINTER (id);
3737 /* All builtins that don't begin with an '_' should additionally
3738 go in the 'std' namespace. */
3741 tree decl2 = copy_node(decl);
3742 push_namespace (std_identifier);
3743 builtin_function_1 (decl2, std_node, true);
3747 return builtin_function_1 (decl, NULL_TREE, true);
3750 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3751 function. Not called directly. */
3754 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3756 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3757 DECL_EXTERNAL (fn) = 1;
3758 TREE_PUBLIC (fn) = 1;
3759 DECL_ARTIFICIAL (fn) = 1;
3760 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3761 SET_DECL_LANGUAGE (fn, lang_c);
3762 /* Runtime library routines are, by definition, available in an
3763 external shared object. */
3764 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3765 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3769 /* Returns the _DECL for a library function with C linkage.
3770 We assume that such functions never throw; if this is incorrect,
3771 callers should unset TREE_NOTHROW. */
3774 build_library_fn (tree name, tree type)
3776 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3777 TREE_NOTHROW (fn) = 1;
3781 /* Returns the _DECL for a library function with C++ linkage. */
3784 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3786 tree fn = build_library_fn_1 (name, operator_code, type);
3787 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3788 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3789 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3793 /* Like build_library_fn, but takes a C string instead of an
3797 build_library_fn_ptr (const char* name, tree type)
3799 return build_library_fn (get_identifier (name), type);
3802 /* Like build_cp_library_fn, but takes a C string instead of an
3806 build_cp_library_fn_ptr (const char* name, tree type)
3808 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3811 /* Like build_library_fn, but also pushes the function so that we will
3812 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3813 may throw exceptions listed in RAISES. */
3816 push_library_fn (tree name, tree type, tree raises)
3821 type = build_exception_variant (type, raises);
3823 fn = build_library_fn (name, type);
3824 pushdecl_top_level (fn);
3828 /* Like build_cp_library_fn, but also pushes the function so that it
3829 will be found by normal lookup. */
3832 push_cp_library_fn (enum tree_code operator_code, tree type)
3834 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3841 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3845 push_void_library_fn (tree name, tree parmtypes)
3847 tree type = build_function_type (void_type_node, parmtypes);
3848 return push_library_fn (name, type, NULL_TREE);
3851 /* Like push_library_fn, but also note that this function throws
3852 and does not return. Used for __throw_foo and the like. */
3855 push_throw_library_fn (tree name, tree type)
3857 tree fn = push_library_fn (name, type, NULL_TREE);
3858 TREE_THIS_VOLATILE (fn) = 1;
3859 TREE_NOTHROW (fn) = 0;
3863 /* When we call finish_struct for an anonymous union, we create
3864 default copy constructors and such. But, an anonymous union
3865 shouldn't have such things; this function undoes the damage to the
3866 anonymous union type T.
3868 (The reason that we create the synthesized methods is that we don't
3869 distinguish `union { int i; }' from `typedef union { int i; } U'.
3870 The first is an anonymous union; the second is just an ordinary
3874 fixup_anonymous_aggr (tree t)
3878 /* Wipe out memory of synthesized methods. */
3879 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3880 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3881 TYPE_HAS_COPY_CTOR (t) = 0;
3882 TYPE_HAS_CONST_COPY_CTOR (t) = 0;
3883 TYPE_HAS_COPY_ASSIGN (t) = 0;
3884 TYPE_HAS_CONST_COPY_ASSIGN (t) = 0;
3886 /* Splice the implicitly generated functions out of the TYPE_METHODS
3888 q = &TYPE_METHODS (t);
3891 if (DECL_ARTIFICIAL (*q))
3892 *q = TREE_CHAIN (*q);
3894 q = &DECL_CHAIN (*q);
3897 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3898 if (TYPE_METHODS (t))
3900 tree decl = TYPE_MAIN_DECL (t);
3902 if (TREE_CODE (t) != UNION_TYPE)
3903 error_at (DECL_SOURCE_LOCATION (decl),
3904 "an anonymous struct cannot have function members");
3906 error_at (DECL_SOURCE_LOCATION (decl),
3907 "an anonymous union cannot have function members");
3910 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3911 assignment operators (because they cannot have these methods themselves).
3912 For anonymous unions this is already checked because they are not allowed
3913 in any union, otherwise we have to check it. */
3914 if (TREE_CODE (t) != UNION_TYPE)
3918 for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field))
3919 if (TREE_CODE (field) == FIELD_DECL)
3921 type = TREE_TYPE (field);
3922 if (CLASS_TYPE_P (type))
3924 if (TYPE_NEEDS_CONSTRUCTING (type))
3925 error ("member %q+#D with constructor not allowed "
3926 "in anonymous aggregate", field);
3927 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3928 error ("member %q+#D with destructor not allowed "
3929 "in anonymous aggregate", field);
3930 if (TYPE_HAS_COMPLEX_COPY_ASSIGN (type))
3931 error ("member %q+#D with copy assignment operator "
3932 "not allowed in anonymous aggregate", field);
3938 /* Make sure that a declaration with no declarator is well-formed, i.e.
3939 just declares a tagged type or anonymous union.
3941 Returns the type declared; or NULL_TREE if none. */
3944 check_tag_decl (cp_decl_specifier_seq *declspecs)
3946 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3947 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3948 /* If a class, struct, or enum type is declared by the DECLSPECS
3949 (i.e, if a class-specifier, enum-specifier, or non-typename
3950 elaborated-type-specifier appears in the DECLSPECS),
3951 DECLARED_TYPE is set to the corresponding type. */
3952 tree declared_type = NULL_TREE;
3953 bool error_p = false;
3955 if (declspecs->multiple_types_p)
3956 error ("multiple types in one declaration");
3957 else if (declspecs->redefined_builtin_type)
3959 if (!in_system_header)
3960 permerror (input_location, "redeclaration of C++ built-in type %qT",
3961 declspecs->redefined_builtin_type);
3966 && TYPE_P (declspecs->type)
3967 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3968 && MAYBE_CLASS_TYPE_P (declspecs->type))
3969 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3970 declared_type = declspecs->type;
3971 else if (declspecs->type == error_mark_node)
3973 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3974 permerror (input_location, "declaration does not declare anything");
3975 /* Check for an anonymous union. */
3976 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3977 && TYPE_ANONYMOUS_P (declared_type))
3979 /* 7/3 In a simple-declaration, the optional init-declarator-list
3980 can be omitted only when declaring a class (clause 9) or
3981 enumeration (7.2), that is, when the decl-specifier-seq contains
3982 either a class-specifier, an elaborated-type-specifier with
3983 a class-key (9.1), or an enum-specifier. In these cases and
3984 whenever a class-specifier or enum-specifier is present in the
3985 decl-specifier-seq, the identifiers in these specifiers are among
3986 the names being declared by the declaration (as class-name,
3987 enum-names, or enumerators, depending on the syntax). In such
3988 cases, and except for the declaration of an unnamed bit-field (9.6),
3989 the decl-specifier-seq shall introduce one or more names into the
3990 program, or shall redeclare a name introduced by a previous
3991 declaration. [Example:
3992 enum { }; // ill-formed
3993 typedef class { }; // ill-formed
3997 error ("missing type-name in typedef-declaration");
4000 /* Anonymous unions are objects, so they can have specifiers. */;
4001 SET_ANON_AGGR_TYPE_P (declared_type);
4003 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
4004 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
4009 if (declspecs->specs[(int)ds_inline]
4010 || declspecs->specs[(int)ds_virtual])
4011 error ("%qs can only be specified for functions",
4012 declspecs->specs[(int)ds_inline]
4013 ? "inline" : "virtual");
4015 && (!current_class_type
4016 || current_scope () != current_class_type))
4017 error ("%<friend%> can only be specified inside a class");
4018 else if (declspecs->specs[(int)ds_explicit])
4019 error ("%<explicit%> can only be specified for constructors");
4020 else if (declspecs->storage_class)
4021 error ("a storage class can only be specified for objects "
4023 else if (declspecs->specs[(int)ds_const]
4024 || declspecs->specs[(int)ds_volatile]
4025 || declspecs->specs[(int)ds_restrict]
4026 || declspecs->specs[(int)ds_thread])
4027 error ("qualifiers can only be specified for objects "
4029 else if (saw_typedef)
4030 warning (0, "%<typedef%> was ignored in this declaration");
4031 else if (declspecs->specs[(int) ds_constexpr])
4032 error ("%<constexpr> cannot be used for type declarations");
4035 return declared_type;
4038 /* Called when a declaration is seen that contains no names to declare.
4039 If its type is a reference to a structure, union or enum inherited
4040 from a containing scope, shadow that tag name for the current scope
4041 with a forward reference.
4042 If its type defines a new named structure or union
4043 or defines an enum, it is valid but we need not do anything here.
4044 Otherwise, it is an error.
4046 C++: may have to grok the declspecs to learn about static,
4047 complain for anonymous unions.
4049 Returns the TYPE declared -- or NULL_TREE if none. */
4052 shadow_tag (cp_decl_specifier_seq *declspecs)
4054 tree t = check_tag_decl (declspecs);
4059 if (declspecs->attributes)
4061 warning (0, "attribute ignored in declaration of %q+#T", t);
4062 warning (0, "attribute for %q+#T must follow the %qs keyword",
4063 t, class_key_or_enum_as_string (t));
4067 if (maybe_process_partial_specialization (t) == error_mark_node)
4070 /* This is where the variables in an anonymous union are
4071 declared. An anonymous union declaration looks like:
4073 because there is no declarator after the union, the parser
4074 sends that declaration here. */
4075 if (ANON_AGGR_TYPE_P (t))
4077 fixup_anonymous_aggr (t);
4079 if (TYPE_FIELDS (t))
4081 tree decl = grokdeclarator (/*declarator=*/NULL,
4082 declspecs, NORMAL, 0, NULL);
4083 finish_anon_union (decl);
4090 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4093 groktypename (cp_decl_specifier_seq *type_specifiers,
4094 const cp_declarator *declarator,
4095 bool is_template_arg)
4099 enum decl_context context
4100 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4101 attrs = type_specifiers->attributes;
4102 type_specifiers->attributes = NULL_TREE;
4103 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4104 if (attrs && type != error_mark_node)
4106 if (CLASS_TYPE_P (type))
4107 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4108 "outside of definition", type);
4109 else if (MAYBE_CLASS_TYPE_P (type))
4110 /* A template type parameter or other dependent type. */
4111 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4112 "type %qT without an associated declaration", type);
4114 cplus_decl_attributes (&type, attrs, 0);
4119 /* Process a DECLARATOR for a function-scope variable declaration,
4120 namespace-scope variable declaration, or function declaration.
4121 (Function definitions go through start_function; class member
4122 declarations appearing in the body of the class go through
4123 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4124 If an error occurs, the error_mark_node is returned instead.
4126 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4127 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4128 for an explicitly defaulted function, or SD_DELETED for an explicitly
4129 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4130 implicitly initialized via a default constructor. ATTRIBUTES and
4131 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4132 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4133 set, the caller is responsible for calling pop_scope. */
4136 start_decl (const cp_declarator *declarator,
4137 cp_decl_specifier_seq *declspecs,
4140 tree prefix_attributes,
4141 tree *pushed_scope_p)
4149 *pushed_scope_p = NULL_TREE;
4151 /* An object declared as __attribute__((deprecated)) suppresses
4152 warnings of uses of other deprecated items. */
4153 if (lookup_attribute ("deprecated", attributes))
4154 deprecated_state = DEPRECATED_SUPPRESS;
4156 attributes = chainon (attributes, prefix_attributes);
4158 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4161 deprecated_state = DEPRECATED_NORMAL;
4163 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4164 || decl == error_mark_node)
4165 return error_mark_node;
4167 context = CP_DECL_CONTEXT (decl);
4168 if (context != global_namespace)
4169 *pushed_scope_p = push_scope (context);
4172 /* Is it valid for this decl to have an initializer at all?
4173 If not, set INITIALIZED to zero, which will indirectly
4174 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4175 switch (TREE_CODE (decl))
4178 error ("typedef %qD is initialized (use decltype instead)", decl);
4179 return error_mark_node;
4182 if (initialized == SD_DELETED)
4183 /* We'll handle the rest of the semantics later, but we need to
4184 set this now so it's visible to duplicate_decls. */
4185 DECL_DELETED_FN (decl) = 1;
4194 if (! toplevel_bindings_p ()
4195 && DECL_EXTERNAL (decl))
4196 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4198 DECL_EXTERNAL (decl) = 0;
4199 if (toplevel_bindings_p ())
4200 TREE_STATIC (decl) = 1;
4202 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) != 0;
4204 if (alias && TREE_CODE (decl) == FUNCTION_DECL)
4205 record_key_method_defined (decl);
4207 /* If this is a typedef that names the class for linkage purposes
4208 (7.1.3p8), apply any attributes directly to the type. */
4209 if (TREE_CODE (decl) == TYPE_DECL
4210 && TAGGED_TYPE_P (TREE_TYPE (decl))
4211 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4212 flags = ATTR_FLAG_TYPE_IN_PLACE;
4216 /* Set attributes here so if duplicate decl, will have proper attributes. */
4217 cplus_decl_attributes (&decl, attributes, flags);
4219 /* Dllimported symbols cannot be defined. Static data members (which
4220 can be initialized in-class and dllimported) go through grokfield,
4221 not here, so we don't need to exclude those decls when checking for
4223 if (initialized && DECL_DLLIMPORT_P (decl))
4225 error ("definition of %q#D is marked %<dllimport%>", decl);
4226 DECL_DLLIMPORT_P (decl) = 0;
4229 /* If #pragma weak was used, mark the decl weak now. */
4230 maybe_apply_pragma_weak (decl);
4232 if (TREE_CODE (decl) == FUNCTION_DECL
4233 && DECL_DECLARED_INLINE_P (decl)
4234 && DECL_UNINLINABLE (decl)
4235 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4236 warning (0, "inline function %q+D given attribute noinline", decl);
4238 if (TYPE_P (context) && COMPLETE_TYPE_P (complete_type (context)))
4240 if (TREE_CODE (decl) == VAR_DECL)
4242 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4243 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4244 error ("%q#D is not a static member of %q#T", decl, context);
4247 if (DECL_CONTEXT (field) != context)
4249 if (!same_type_p (DECL_CONTEXT (field), context))
4250 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4251 "to be defined as %<%T::%D%>",
4252 DECL_CONTEXT (field), DECL_NAME (decl),
4253 context, DECL_NAME (decl));
4254 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4256 if (processing_specialization
4257 && template_class_depth (context) == 0
4258 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4259 error ("template header not allowed in member definition "
4260 "of explicitly specialized class");
4261 /* Static data member are tricky; an in-class initialization
4262 still doesn't provide a definition, so the in-class
4263 declaration will have DECL_EXTERNAL set, but will have an
4264 initialization. Thus, duplicate_decls won't warn
4265 about this situation, and so we check here. */
4266 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4267 error ("duplicate initialization of %qD", decl);
4268 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4270 if (declspecs->specs[(int) ds_constexpr]
4271 && !DECL_DECLARED_CONSTEXPR_P (field))
4272 error ("%qD declared %<constexpr%> outside its class", field);
4277 tree field = check_classfn (context, decl,
4278 (processing_template_decl
4279 > template_class_depth (context))
4280 ? current_template_parms
4282 if (field && field != error_mark_node
4283 && duplicate_decls (decl, field,
4284 /*newdecl_is_friend=*/false))
4288 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4289 DECL_IN_AGGR_P (decl) = 0;
4290 /* Do not mark DECL as an explicit specialization if it was not
4291 already marked as an instantiation; a declaration should
4292 never be marked as a specialization unless we know what
4293 template is being specialized. */
4294 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4296 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4298 /* [temp.expl.spec] An explicit specialization of a static data
4299 member of a template is a definition if the declaration
4300 includes an initializer; otherwise, it is a declaration.
4302 We check for processing_specialization so this only applies
4303 to the new specialization syntax. */
4304 if (!initialized && processing_specialization)
4305 DECL_EXTERNAL (decl) = 1;
4308 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl)
4309 /* Aliases are definitions. */
4311 permerror (input_location, "declaration of %q#D outside of class is not definition",
4314 if (!ensure_literal_type_for_constexpr_object (decl))
4315 return error_mark_node;
4318 was_public = TREE_PUBLIC (decl);
4320 /* Enter this declaration into the symbol table. */
4321 decl = maybe_push_decl (decl);
4323 if (processing_template_decl)
4324 decl = push_template_decl (decl);
4325 if (decl == error_mark_node)
4326 return error_mark_node;
4328 /* Tell the back end to use or not use .common as appropriate. If we say
4329 -fconserve-space, we want this to save .data space, at the expense of
4330 wrong semantics. If we say -fno-conserve-space, we want this to
4331 produce errors about redefs; to do this we force variables into the
4333 if (flag_conserve_space
4334 && TREE_CODE (decl) == VAR_DECL
4335 && TREE_PUBLIC (decl)
4336 && !DECL_THREAD_LOCAL_P (decl)
4337 && !have_global_bss_p ())
4338 DECL_COMMON (decl) = 1;
4340 if (TREE_CODE (decl) == VAR_DECL
4341 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4342 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4344 /* This is a const variable with implicit 'static'. Set
4345 DECL_THIS_STATIC so we can tell it from variables that are
4346 !TREE_PUBLIC because of the anonymous namespace. */
4347 gcc_assert (CP_TYPE_CONST_P (TREE_TYPE (decl)));
4348 DECL_THIS_STATIC (decl) = 1;
4351 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4352 start_decl_1 (decl, initialized);
4357 /* Process the declaration of a variable DECL. INITIALIZED is true
4358 iff DECL is explicitly initialized. (INITIALIZED is false if the
4359 variable is initialized via an implicitly-called constructor.)
4360 This function must be called for ordinary variables (including, for
4361 example, implicit instantiations of templates), but must not be
4362 called for template declarations. */
4365 start_decl_1 (tree decl, bool initialized)
4369 bool aggregate_definition_p;
4371 gcc_assert (!processing_template_decl);
4373 if (error_operand_p (decl))
4376 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4378 type = TREE_TYPE (decl);
4379 complete_p = COMPLETE_TYPE_P (type);
4380 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4382 /* If an explicit initializer is present, or if this is a definition
4383 of an aggregate, then we need a complete type at this point.
4384 (Scalars are always complete types, so there is nothing to
4385 check.) This code just sets COMPLETE_P; errors (if necessary)
4386 are issued below. */
4387 if ((initialized || aggregate_definition_p)
4389 && COMPLETE_TYPE_P (complete_type (type)))
4392 /* We will not yet have set TREE_READONLY on DECL if the type
4393 was "const", but incomplete, before this point. But, now, we
4394 have a complete type, so we can try again. */
4395 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4399 /* Is it valid for this decl to have an initializer at all? */
4401 /* Don't allow initializations for incomplete types except for
4402 arrays which might be completed by the initialization. */
4404 ; /* A complete type is ok. */
4405 else if (type_uses_auto (type))
4406 ; /* An auto type is ok. */
4407 else if (TREE_CODE (type) != ARRAY_TYPE)
4409 error ("variable %q#D has initializer but incomplete type", decl);
4410 type = TREE_TYPE (decl) = error_mark_node;
4412 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4414 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4415 error ("elements of array %q#D have incomplete type", decl);
4416 /* else we already gave an error in start_decl. */
4419 else if (aggregate_definition_p && !complete_p)
4421 if (type_uses_auto (type))
4422 error ("declaration of %q#D has no initializer", decl);
4424 error ("aggregate %q#D has incomplete type and cannot be defined",
4426 /* Change the type so that assemble_variable will give
4427 DECL an rtl we can live with: (mem (const_int 0)). */
4428 type = TREE_TYPE (decl) = error_mark_node;
4431 /* Create a new scope to hold this declaration if necessary.
4432 Whether or not a new scope is necessary cannot be determined
4433 until after the type has been completed; if the type is a
4434 specialization of a class template it is not until after
4435 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4436 will be set correctly. */
4437 maybe_push_cleanup_level (type);
4440 /* Handle initialization of references. DECL, TYPE, and INIT have the
4441 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4442 but will be set to a new CLEANUP_STMT if a temporary is created
4443 that must be destroyed subsequently.
4445 Returns an initializer expression to use to initialize DECL, or
4446 NULL if the initialization can be performed statically.
4448 Quotes on semantics can be found in ARM 8.4.3. */
4451 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4455 if (init == NULL_TREE)
4457 if ((DECL_LANG_SPECIFIC (decl) == 0
4458 || DECL_IN_AGGR_P (decl) == 0)
4459 && ! DECL_THIS_EXTERN (decl))
4460 error ("%qD declared as reference but not initialized", decl);
4464 if (TREE_CODE (init) == TREE_LIST)
4465 init = build_x_compound_expr_from_list (init, ELK_INIT,
4466 tf_warning_or_error);
4468 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4469 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4470 /* Note: default conversion is only called in very special cases. */
4471 init = decay_conversion (init);
4473 /* Convert INIT to the reference type TYPE. This may involve the
4474 creation of a temporary, whose lifetime must be the same as that
4475 of the reference. If so, a DECL_EXPR for the temporary will be
4476 added just after the DECL_EXPR for DECL. That's why we don't set
4477 DECL_INITIAL for local references (instead assigning to them
4478 explicitly); we need to allow the temporary to be initialized
4480 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4482 if (tmp == error_mark_node)
4484 else if (tmp == NULL_TREE)
4486 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4490 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4493 DECL_INITIAL (decl) = tmp;
4498 /* Subroutine of check_initializer. We're initializing a DECL of
4499 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4500 extend the lifetime of the underlying array to match that of the decl,
4501 just like for reference initialization. CLEANUP is as for
4502 grok_reference_init. */
4505 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4507 tree aggr_init, array, arrtype;
4508 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4509 if (error_operand_p (init))
4510 return error_mark_node;
4512 aggr_init = TARGET_EXPR_INITIAL (init);
4513 init = build2 (INIT_EXPR, type, decl, init);
4515 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4516 arrtype = TREE_TYPE (array);
4518 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4519 array = TREE_OPERAND (array, 0);
4520 /* If the array is constant, finish_compound_literal already made it a
4521 static variable and we don't need to do anything here. */
4522 if (decl && TREE_CODE (array) == TARGET_EXPR)
4525 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4526 var = build_address (var);
4527 var = convert (arrtype, var);
4528 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4529 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4534 /* Designated initializers in arrays are not supported in GNU C++.
4535 The parser cannot detect this error since it does not know whether
4536 a given brace-enclosed initializer is for a class type or for an
4537 array. This function checks that CE does not use a designated
4538 initializer. If it does, an error is issued. Returns true if CE
4539 is valid, i.e., does not have a designated initializer. */
4542 check_array_designated_initializer (const constructor_elt *ce)
4544 /* Designated initializers for array elements are not supported. */
4547 /* The parser only allows identifiers as designated
4549 if (ce->index == error_mark_node)
4550 error ("name used in a GNU-style designated "
4551 "initializer for an array");
4554 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4555 error ("name %qD used in a GNU-style designated "
4556 "initializer for an array", ce->index);
4564 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4565 array until we finish parsing the initializer. If that's the
4566 situation we're in, update DECL accordingly. */
4569 maybe_deduce_size_from_array_init (tree decl, tree init)
4571 tree type = TREE_TYPE (decl);
4573 if (TREE_CODE (type) == ARRAY_TYPE
4574 && TYPE_DOMAIN (type) == NULL_TREE
4575 && TREE_CODE (decl) != TYPE_DECL)
4577 /* do_default is really a C-ism to deal with tentative definitions.
4578 But let's leave it here to ease the eventual merge. */
4579 int do_default = !DECL_EXTERNAL (decl);
4580 tree initializer = init ? init : DECL_INITIAL (decl);
4583 /* Check that there are no designated initializers in INIT, as
4584 those are not supported in GNU C++, and as the middle-end
4585 will crash if presented with a non-numeric designated
4587 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4589 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4590 constructor_elt *ce;
4592 FOR_EACH_VEC_ELT (constructor_elt, v, i, ce)
4593 if (!check_array_designated_initializer (ce))
4599 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4603 error ("initializer fails to determine size of %qD", decl);
4604 TREE_TYPE (decl) = error_mark_node;
4606 else if (failure == 2)
4610 error ("array size missing in %qD", decl);
4611 TREE_TYPE (decl) = error_mark_node;
4613 /* If a `static' var's size isn't known, make it extern as
4614 well as static, so it does not get allocated. If it's not
4615 `static', then don't mark it extern; finish_incomplete_decl
4616 will give it a default size and it will get allocated. */
4617 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4618 DECL_EXTERNAL (decl) = 1;
4620 else if (failure == 3)
4622 error ("zero-size array %qD", decl);
4623 TREE_TYPE (decl) = error_mark_node;
4627 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4629 relayout_decl (decl);
4633 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4634 any appropriate error messages regarding the layout. */
4637 layout_var_decl (tree decl)
4641 type = TREE_TYPE (decl);
4642 if (type == error_mark_node)
4645 /* If we haven't already layed out this declaration, do so now.
4646 Note that we must not call complete type for an external object
4647 because it's type might involve templates that we are not
4648 supposed to instantiate yet. (And it's perfectly valid to say
4649 `extern X x' for some incomplete type `X'.) */
4650 if (!DECL_EXTERNAL (decl))
4651 complete_type (type);
4652 if (!DECL_SIZE (decl)
4653 && TREE_TYPE (decl) != error_mark_node
4654 && (COMPLETE_TYPE_P (type)
4655 || (TREE_CODE (type) == ARRAY_TYPE
4656 && !TYPE_DOMAIN (type)
4657 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4658 layout_decl (decl, 0);
4660 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4662 /* An automatic variable with an incomplete type: that is an error.
4663 Don't talk about array types here, since we took care of that
4664 message in grokdeclarator. */
4665 error ("storage size of %qD isn't known", decl);
4666 TREE_TYPE (decl) = error_mark_node;
4669 /* Keep this code around in case we later want to control debug info
4670 based on whether a type is "used". (jason 1999-11-11) */
4672 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4673 /* Let debugger know it should output info for this type. */
4674 note_debug_info_needed (ttype);
4676 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4677 note_debug_info_needed (DECL_CONTEXT (decl));
4680 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4681 && DECL_SIZE (decl) != NULL_TREE
4682 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4684 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4685 constant_expression_warning (DECL_SIZE (decl));
4688 error ("storage size of %qD isn't constant", decl);
4689 TREE_TYPE (decl) = error_mark_node;
4694 /* If a local static variable is declared in an inline function, or if
4695 we have a weak definition, we must endeavor to create only one
4696 instance of the variable at link-time. */
4699 maybe_commonize_var (tree decl)
4701 /* Static data in a function with comdat linkage also has comdat
4703 if (TREE_STATIC (decl)
4704 /* Don't mess with __FUNCTION__. */
4705 && ! DECL_ARTIFICIAL (decl)
4706 && DECL_FUNCTION_SCOPE_P (decl)
4707 && vague_linkage_p (DECL_CONTEXT (decl)))
4711 /* With weak symbols, we simply make the variable COMDAT;
4712 that will cause copies in multiple translations units to
4714 comdat_linkage (decl);
4718 if (DECL_INITIAL (decl) == NULL_TREE
4719 || DECL_INITIAL (decl) == error_mark_node)
4721 /* Without weak symbols, we can use COMMON to merge
4722 uninitialized variables. */
4723 TREE_PUBLIC (decl) = 1;
4724 DECL_COMMON (decl) = 1;
4728 /* While for initialized variables, we must use internal
4729 linkage -- which means that multiple copies will not
4731 TREE_PUBLIC (decl) = 0;
4732 DECL_COMMON (decl) = 0;
4733 warning_at (input_location, 0,
4734 "sorry: semantics of inline function static "
4735 "data %q+#D are wrong (you'll wind up "
4736 "with multiple copies)", decl);
4737 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4738 " you can work around this by removing "
4743 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4744 /* Set it up again; we might have set DECL_INITIAL since the last
4746 comdat_linkage (decl);
4749 /* Issue an error message if DECL is an uninitialized const variable. */
4752 check_for_uninitialized_const_var (tree decl)
4754 tree type = strip_array_types (TREE_TYPE (decl));
4756 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
4757 && DECL_INITIAL (decl) == NULL)
4758 error ("missing initializer for constexpr %qD", decl);
4760 /* ``Unless explicitly declared extern, a const object does not have
4761 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4763 else if (TREE_CODE (decl) == VAR_DECL
4764 && TREE_CODE (type) != REFERENCE_TYPE
4765 && CP_TYPE_CONST_P (type)
4766 && (!TYPE_NEEDS_CONSTRUCTING (type)
4767 || !type_has_user_provided_default_constructor (type))
4768 && !DECL_INITIAL (decl))
4770 permerror (DECL_SOURCE_LOCATION (decl),
4771 "uninitialized const %qD", decl);
4773 if (CLASS_TYPE_P (type)
4774 && !type_has_user_provided_default_constructor (type))
4776 tree defaulted_ctor;
4778 inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
4779 "%q#T has no user-provided default constructor", type);
4780 defaulted_ctor = in_class_defaulted_default_constructor (type);
4782 inform (DECL_SOURCE_LOCATION (defaulted_ctor),
4783 "constructor is not user-provided because it is "
4784 "explicitly defaulted in the class body");
4789 /* Structure holding the current initializer being processed by reshape_init.
4790 CUR is a pointer to the current element being processed, END is a pointer
4791 after the last element present in the initializer. */
4792 typedef struct reshape_iterator_t
4794 constructor_elt *cur;
4795 constructor_elt *end;
4798 static tree reshape_init_r (tree, reshape_iter *, bool);
4800 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4801 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4802 initialized. If there are no more such fields, the return value
4806 next_initializable_field (tree field)
4809 && (TREE_CODE (field) != FIELD_DECL
4810 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4811 || DECL_ARTIFICIAL (field)))
4812 field = DECL_CHAIN (field);
4817 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4818 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4819 INTEGER_CST representing the size of the array minus one (the maximum index),
4820 or NULL_TREE if the array was declared without specifying the size. D is
4821 the iterator within the constructor. */
4824 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4827 bool sized_array_p = (max_index != NULL_TREE);
4828 unsigned HOST_WIDE_INT max_index_cst = 0;
4829 unsigned HOST_WIDE_INT index;
4831 /* The initializer for an array is always a CONSTRUCTOR. */
4832 new_init = build_constructor (init_list_type_node, NULL);
4836 /* Minus 1 is used for zero sized arrays. */
4837 if (integer_all_onesp (max_index))
4840 if (host_integerp (max_index, 1))
4841 max_index_cst = tree_low_cst (max_index, 1);
4842 /* sizetype is sign extended, not zero extended. */
4844 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4848 /* Loop until there are no more initializers. */
4850 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4855 check_array_designated_initializer (d->cur);
4856 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4857 if (elt_init == error_mark_node)
4858 return error_mark_node;
4859 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4865 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4866 Parameters are the same of reshape_init_r. */
4869 reshape_init_array (tree type, reshape_iter *d)
4871 tree max_index = NULL_TREE;
4873 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4875 if (TYPE_DOMAIN (type))
4876 max_index = array_type_nelts (type);
4878 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4881 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4882 Parameters are the same of reshape_init_r. */
4885 reshape_init_vector (tree type, reshape_iter *d)
4887 tree max_index = NULL_TREE;
4889 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4891 if (COMPOUND_LITERAL_P (d->cur->value))
4893 tree value = d->cur->value;
4894 if (!same_type_p (TREE_TYPE (value), type))
4896 error ("invalid type %qT as initializer for a vector of type %qT",
4897 TREE_TYPE (d->cur->value), type);
4898 value = error_mark_node;
4904 /* For a vector, we initialize it as an array of the appropriate size. */
4905 if (TREE_CODE (type) == VECTOR_TYPE)
4906 max_index = size_int (TYPE_VECTOR_SUBPARTS (type) - 1);
4908 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4911 /* Subroutine of reshape_init_r, processes the initializers for classes
4912 or union. Parameters are the same of reshape_init_r. */
4915 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4920 gcc_assert (CLASS_TYPE_P (type));
4922 /* The initializer for a class is always a CONSTRUCTOR. */
4923 new_init = build_constructor (init_list_type_node, NULL);
4924 field = next_initializable_field (TYPE_FIELDS (type));
4930 An initializer for an aggregate member that is an
4931 empty class shall have the form of an empty
4932 initializer-list {}. */
4933 if (!first_initializer_p)
4935 error ("initializer for %qT must be brace-enclosed", type);
4936 return error_mark_node;
4941 /* Loop through the initializable fields, gathering initializers. */
4942 while (d->cur != d->end)
4946 /* Handle designated initializers, as an extension. */
4949 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4951 if (!field || TREE_CODE (field) != FIELD_DECL)
4953 error ("%qT has no non-static data member named %qD", type,
4955 return error_mark_node;
4959 /* If we processed all the member of the class, we are done. */
4963 field_init = reshape_init_r (TREE_TYPE (field), d,
4964 /*first_initializer_p=*/false);
4965 if (field_init == error_mark_node)
4966 return error_mark_node;
4968 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4972 When a union is initialized with a brace-enclosed
4973 initializer, the braces shall only contain an
4974 initializer for the first member of the union. */
4975 if (TREE_CODE (type) == UNION_TYPE)
4978 field = next_initializable_field (DECL_CHAIN (field));
4984 /* Subroutine of reshape_init, which processes a single initializer (part of
4985 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4986 iterator within the CONSTRUCTOR which points to the initializer to process.
4987 FIRST_INITIALIZER_P is true if this is the first initializer of the
4988 outermost CONSTRUCTOR node. */
4991 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4993 tree init = d->cur->value;
4995 if (error_operand_p (init))
4996 return error_mark_node;
4998 /* A non-aggregate type is always initialized with a single
5000 if (!CP_AGGREGATE_TYPE_P (type))
5002 /* It is invalid to initialize a non-aggregate type with a
5003 brace-enclosed initializer before C++0x.
5004 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
5005 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
5006 a CONSTRUCTOR (with a record type). */
5007 if (TREE_CODE (init) == CONSTRUCTOR
5008 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
5010 if (SCALAR_TYPE_P (type))
5012 error ("braces around scalar initializer for type %qT", type);
5013 init = error_mark_node;
5016 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5025 All implicit type conversions (clause _conv_) are considered when
5026 initializing the aggregate member with an initializer from an
5027 initializer-list. If the initializer can initialize a member,
5028 the member is initialized. Otherwise, if the member is itself a
5029 non-empty subaggregate, brace elision is assumed and the
5030 initializer is considered for the initialization of the first
5031 member of the subaggregate. */
5032 if (TREE_CODE (init) != CONSTRUCTOR
5033 /* But don't try this for the first initializer, since that would be
5034 looking through the outermost braces; A a2 = { a1 }; is not a
5035 valid aggregate initialization. */
5036 && !first_initializer_p
5037 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
5038 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
5044 /* [dcl.init.string]
5046 A char array (whether plain char, signed char, or unsigned char)
5047 can be initialized by a string-literal (optionally enclosed in
5048 braces); a wchar_t array can be initialized by a wide
5049 string-literal (optionally enclosed in braces). */
5050 if (TREE_CODE (type) == ARRAY_TYPE
5051 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
5053 tree str_init = init;
5055 /* Strip one level of braces if and only if they enclose a single
5056 element (as allowed by [dcl.init.string]). */
5057 if (!first_initializer_p
5058 && TREE_CODE (str_init) == CONSTRUCTOR
5059 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
5061 str_init = VEC_index (constructor_elt,
5062 CONSTRUCTOR_ELTS (str_init), 0)->value;
5065 /* If it's a string literal, then it's the initializer for the array
5066 as a whole. Otherwise, continue with normal initialization for
5067 array types (one value per array element). */
5068 if (TREE_CODE (str_init) == STRING_CST)
5075 /* The following cases are about aggregates. If we are not within a full
5076 initializer already, and there is not a CONSTRUCTOR, it means that there
5077 is a missing set of braces (that is, we are processing the case for
5078 which reshape_init exists). */
5079 if (!first_initializer_p)
5081 if (TREE_CODE (init) == CONSTRUCTOR)
5083 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5084 /* There is no need to reshape pointer-to-member function
5085 initializers, as they are always constructed correctly
5086 by the front end. */
5088 else if (COMPOUND_LITERAL_P (init))
5089 /* For a nested compound literal, there is no need to reshape since
5090 brace elision is not allowed. Even if we decided to allow it,
5091 we should add a call to reshape_init in finish_compound_literal,
5092 before calling digest_init, so changing this code would still
5093 not be necessary. */
5094 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5098 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5099 return reshape_init (type, init);
5103 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5107 /* Dispatch to specialized routines. */
5108 if (CLASS_TYPE_P (type))
5109 return reshape_init_class (type, d, first_initializer_p);
5110 else if (TREE_CODE (type) == ARRAY_TYPE)
5111 return reshape_init_array (type, d);
5112 else if (TREE_CODE (type) == VECTOR_TYPE)
5113 return reshape_init_vector (type, d);
5118 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5119 brace-enclosed aggregate initializer.
5121 INIT is the CONSTRUCTOR containing the list of initializers describing
5122 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5123 It may not presently match the shape of the TYPE; for example:
5125 struct S { int a; int b; };
5126 struct S a[] = { 1, 2, 3, 4 };
5128 Here INIT will hold a VEC of four elements, rather than a
5129 VEC of two elements, each itself a VEC of two elements. This
5130 routine transforms INIT from the former form into the latter. The
5131 revised CONSTRUCTOR node is returned. */
5134 reshape_init (tree type, tree init)
5136 VEC(constructor_elt, gc) *v;
5140 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5142 v = CONSTRUCTOR_ELTS (init);
5144 /* An empty constructor does not need reshaping, and it is always a valid
5146 if (VEC_empty (constructor_elt, v))
5149 /* Recurse on this CONSTRUCTOR. */
5150 d.cur = VEC_index (constructor_elt, v, 0);
5151 d.end = d.cur + VEC_length (constructor_elt, v);
5153 new_init = reshape_init_r (type, &d, true);
5154 if (new_init == error_mark_node)
5155 return error_mark_node;
5157 /* Make sure all the element of the constructor were used. Otherwise,
5158 issue an error about exceeding initializers. */
5160 error ("too many initializers for %qT", type);
5165 /* Verify array initializer. Returns true if errors have been reported. */
5168 check_array_initializer (tree decl, tree type, tree init)
5170 tree element_type = TREE_TYPE (type);
5172 /* The array type itself need not be complete, because the
5173 initializer may tell us how many elements are in the array.
5174 But, the elements of the array must be complete. */
5175 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5178 error ("elements of array %q#D have incomplete type", decl);
5180 error ("elements of array %q#T have incomplete type", type);
5183 /* It is not valid to initialize a VLA. */
5185 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5186 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5189 error ("variable-sized object %qD may not be initialized", decl);
5191 error ("variable-sized compound literal");
5197 /* Subroutine of check_initializer; args are passed down from that function.
5198 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5201 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5204 int saved_stmts_are_full_exprs_p = 0;
5205 if (building_stmt_tree ())
5207 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5208 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5210 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5211 if (building_stmt_tree ())
5212 current_stmt_tree ()->stmts_are_full_exprs_p =
5213 saved_stmts_are_full_exprs_p;
5217 /* Verify INIT (the initializer for DECL), and record the
5218 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5219 grok_reference_init.
5221 If the return value is non-NULL, it is an expression that must be
5222 evaluated dynamically to initialize DECL. */
5225 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5227 tree type = TREE_TYPE (decl);
5228 tree init_code = NULL;
5231 /* Things that are going to be initialized need to have complete
5233 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5235 if (type == error_mark_node)
5236 /* We will have already complained. */
5239 if (TREE_CODE (type) == ARRAY_TYPE)
5241 if (check_array_initializer (decl, type, init))
5244 else if (!COMPLETE_TYPE_P (type))
5246 error ("%qD has incomplete type", decl);
5247 TREE_TYPE (decl) = error_mark_node;
5251 /* There is no way to make a variable-sized class type in GNU C++. */
5252 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5254 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5256 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5257 if (SCALAR_TYPE_P (type))
5261 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5262 init = build_zero_init (type, NULL_TREE, false);
5264 else if (init_len != 1)
5266 error ("scalar object %qD requires one element in initializer",
5268 TREE_TYPE (decl) = error_mark_node;
5274 if (TREE_CODE (decl) == CONST_DECL)
5276 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5278 DECL_INITIAL (decl) = init;
5280 gcc_assert (init != NULL_TREE);
5283 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5284 init = grok_reference_init (decl, type, init, cleanup);
5287 /* Do not reshape constructors of vectors (they don't need to be
5289 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5291 if (is_std_init_list (type))
5292 return build_init_list_var_init (decl, type, init, cleanup);
5293 else if (TYPE_NON_AGGREGATE_CLASS (type))
5295 /* Don't reshape if the class has constructors. */
5296 if (cxx_dialect == cxx98)
5297 error ("in C++98 %qD must be initialized by constructor, "
5301 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5303 error ("opaque vector types cannot be initialized");
5304 init = error_mark_node;
5307 init = reshape_init (type, init);
5310 /* If DECL has an array type without a specific bound, deduce the
5311 array size from the initializer. */
5312 maybe_deduce_size_from_array_init (decl, init);
5313 type = TREE_TYPE (decl);
5314 if (type == error_mark_node)
5317 if (TYPE_NEEDS_CONSTRUCTING (type)
5318 || (CLASS_TYPE_P (type)
5319 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5320 return build_aggr_init_full_exprs (decl, init, flags);
5321 else if (TREE_CODE (init) != TREE_VEC)
5323 init_code = store_init_value (decl, init, flags);
5324 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5325 && DECL_INITIAL (decl)
5326 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5327 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5328 warning (0, "array %qD initialized by parenthesized string literal %qE",
5329 decl, DECL_INITIAL (decl));
5333 else if (DECL_EXTERNAL (decl))
5335 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5337 check_for_uninitialized_const_var (decl);
5338 return build_aggr_init_full_exprs (decl, init, flags);
5340 else if (MAYBE_CLASS_TYPE_P (core_type = strip_array_types (type)))
5342 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type)
5343 || CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5344 diagnose_uninitialized_cst_or_ref_member (core_type, /*using_new=*/false,
5347 check_for_uninitialized_const_var (decl);
5350 check_for_uninitialized_const_var (decl);
5352 if (init && init != error_mark_node)
5353 init_code = build2 (INIT_EXPR, type, decl, init);
5358 /* If DECL is not a local variable, give it RTL. */
5361 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5363 int toplev = toplevel_bindings_p ();
5365 const char *filename;
5367 /* Set the DECL_ASSEMBLER_NAME for the object. */
5370 /* The `register' keyword, when used together with an
5371 asm-specification, indicates that the variable should be
5372 placed in a particular register. */
5373 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5375 set_user_assembler_name (decl, asmspec);
5376 DECL_HARD_REGISTER (decl) = 1;
5380 if (TREE_CODE (decl) == FUNCTION_DECL
5381 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5382 set_builtin_user_assembler_name (decl, asmspec);
5383 set_user_assembler_name (decl, asmspec);
5387 /* Handle non-variables up front. */
5388 if (TREE_CODE (decl) != VAR_DECL)
5390 rest_of_decl_compilation (decl, toplev, at_eof);
5394 /* If we see a class member here, it should be a static data
5396 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5398 gcc_assert (TREE_STATIC (decl));
5399 /* An in-class declaration of a static data member should be
5400 external; it is only a declaration, and not a definition. */
5401 if (init == NULL_TREE)
5402 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5405 /* We don't create any RTL for local variables. */
5406 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5409 /* We defer emission of local statics until the corresponding
5410 DECL_EXPR is expanded. */
5411 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5413 /* We try to defer namespace-scope static constants so that they are
5414 not emitted into the object file unnecessarily. */
5415 filename = input_filename;
5416 if (!DECL_VIRTUAL_P (decl)
5417 && TREE_READONLY (decl)
5418 && DECL_INITIAL (decl) != NULL_TREE
5419 && DECL_INITIAL (decl) != error_mark_node
5421 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5423 && !TREE_PUBLIC (decl))
5425 /* Fool with the linkage of static consts according to #pragma
5427 struct c_fileinfo *finfo = get_fileinfo (filename);
5428 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5430 TREE_PUBLIC (decl) = 1;
5431 DECL_EXTERNAL (decl) = finfo->interface_only;
5436 /* Likewise for template instantiations. */
5437 else if (DECL_LANG_SPECIFIC (decl)
5438 && DECL_IMPLICIT_INSTANTIATION (decl))
5441 /* If we're not deferring, go ahead and assemble the variable. */
5443 rest_of_decl_compilation (decl, toplev, at_eof);
5446 /* walk_tree helper for wrap_temporary_cleanups, below. */
5449 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5451 if (TYPE_P (*stmt_p))
5457 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5459 tree guard = (tree)data;
5460 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5462 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5463 /* Tell honor_protect_cleanup_actions to handle this as a separate
5465 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5467 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5473 /* We're initializing a local variable which has a cleanup GUARD. If there
5474 are any temporaries used in the initializer INIT of this variable, we
5475 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5476 variable will be cleaned up properly if one of them throws.
5478 Unfortunately, there's no way to express this properly in terms of
5479 nesting, as the regions for the temporaries overlap the region for the
5480 variable itself; if there are two temporaries, the variable needs to be
5481 the first thing destroyed if either of them throws. However, we only
5482 want to run the variable's cleanup if it actually got constructed. So
5483 we need to guard the temporary cleanups with the variable's cleanup if
5484 they are run on the normal path, but not if they are run on the
5485 exceptional path. We implement this by telling
5486 honor_protect_cleanup_actions to strip the variable cleanup from the
5487 exceptional path. */
5490 wrap_temporary_cleanups (tree init, tree guard)
5492 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5495 /* Generate code to initialize DECL (a local variable). */
5498 initialize_local_var (tree decl, tree init)
5500 tree type = TREE_TYPE (decl);
5504 gcc_assert (TREE_CODE (decl) == VAR_DECL
5505 || TREE_CODE (decl) == RESULT_DECL);
5506 gcc_assert (!TREE_STATIC (decl));
5508 if (DECL_SIZE (decl) == NULL_TREE)
5510 /* If we used it already as memory, it must stay in memory. */
5511 DECL_INITIAL (decl) = NULL_TREE;
5512 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5516 if (type == error_mark_node)
5519 /* Compute and store the initial value. */
5520 already_used = TREE_USED (decl) || TREE_USED (type);
5521 if (TREE_USED (type))
5522 DECL_READ_P (decl) = 1;
5524 /* Generate a cleanup, if necessary. */
5525 cleanup = cxx_maybe_build_cleanup (decl);
5527 /* Perform the initialization. */
5530 int saved_stmts_are_full_exprs_p;
5532 /* If we're only initializing a single object, guard the destructors
5533 of any temporaries used in its initializer with its destructor.
5534 This isn't right for arrays because each element initialization is
5535 a full-expression. */
5536 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5537 wrap_temporary_cleanups (init, cleanup);
5539 gcc_assert (building_stmt_tree ());
5540 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5541 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5542 finish_expr_stmt (init);
5543 current_stmt_tree ()->stmts_are_full_exprs_p =
5544 saved_stmts_are_full_exprs_p;
5547 /* Set this to 0 so we can tell whether an aggregate which was
5548 initialized was ever used. Don't do this if it has a
5549 destructor, so we don't complain about the 'resource
5550 allocation is initialization' idiom. Now set
5551 attribute((unused)) on types so decls of that type will be
5552 marked used. (see TREE_USED, above.) */
5553 if (TYPE_NEEDS_CONSTRUCTING (type)
5555 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5556 && DECL_NAME (decl))
5557 TREE_USED (decl) = 0;
5558 else if (already_used)
5559 TREE_USED (decl) = 1;
5562 finish_decl_cleanup (decl, cleanup);
5565 /* DECL is a VAR_DECL for a compiler-generated variable with static
5566 storage duration (like a virtual table) whose initializer is a
5567 compile-time constant. Initialize the variable and provide it to the
5571 initialize_artificial_var (tree decl, VEC(constructor_elt,gc) *v)
5574 gcc_assert (DECL_ARTIFICIAL (decl));
5575 init = build_constructor (TREE_TYPE (decl), v);
5576 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5577 DECL_INITIAL (decl) = init;
5578 DECL_INITIALIZED_P (decl) = 1;
5579 determine_visibility (decl);
5580 layout_var_decl (decl);
5581 maybe_commonize_var (decl);
5582 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5585 /* INIT is the initializer for a variable, as represented by the
5586 parser. Returns true iff INIT is value-dependent. */
5589 value_dependent_init_p (tree init)
5591 if (TREE_CODE (init) == TREE_LIST)
5592 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5593 return any_value_dependent_elements_p (init);
5594 else if (TREE_CODE (init) == CONSTRUCTOR)
5595 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5597 VEC(constructor_elt, gc) *elts;
5601 elts = CONSTRUCTOR_ELTS (init);
5602 nelts = VEC_length (constructor_elt, elts);
5603 for (i = 0; i < nelts; ++i)
5604 if (value_dependent_init_p (VEC_index (constructor_elt,
5609 /* It must be a simple expression, e.g., int i = 3; */
5610 return value_dependent_expression_p (init);
5615 /* Finish processing of a declaration;
5616 install its line number and initial value.
5617 If the length of an array type is not known before,
5618 it must be determined now, from the initial value, or it is an error.
5620 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5621 true, then INIT is an integral constant expression.
5623 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5624 if the (init) syntax was used. */
5627 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5628 tree asmspec_tree, int flags)
5632 const char *asmspec = NULL;
5633 int was_readonly = 0;
5634 bool var_definition_p = false;
5635 int saved_processing_template_decl;
5638 if (decl == error_mark_node)
5643 error ("assignment (not initialization) in declaration");
5647 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5648 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5649 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5651 type = TREE_TYPE (decl);
5652 if (type == error_mark_node)
5655 /* Assume no cleanup is required. */
5656 cleanup = NULL_TREE;
5657 saved_processing_template_decl = processing_template_decl;
5659 /* If a name was specified, get the string. */
5660 if (global_scope_p (current_binding_level))
5661 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5662 if (asmspec_tree && asmspec_tree != error_mark_node)
5663 asmspec = TREE_STRING_POINTER (asmspec_tree);
5665 if (current_class_type
5666 && CP_DECL_CONTEXT (decl) == current_class_type
5667 && TYPE_BEING_DEFINED (current_class_type)
5668 && (DECL_INITIAL (decl) || init))
5669 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5671 auto_node = type_uses_auto (type);
5675 if (init == NULL_TREE)
5677 error ("declaration of %q#D has no initializer", decl);
5678 TREE_TYPE (decl) = error_mark_node;
5682 if (TREE_CODE (d_init) == TREE_LIST)
5683 d_init = build_x_compound_expr_from_list (d_init, ELK_INIT,
5684 tf_warning_or_error);
5685 if (describable_type (d_init))
5687 type = TREE_TYPE (decl) = do_auto_deduction (type, d_init,
5689 if (type == error_mark_node)
5694 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5697 if (init == ridpointers[(int)RID_DELETE])
5699 /* FIXME check this is 1st decl. */
5700 DECL_DELETED_FN (decl) = 1;
5701 DECL_DECLARED_INLINE_P (decl) = 1;
5702 DECL_INITIAL (decl) = error_mark_node;
5703 FOR_EACH_CLONE (clone, decl)
5705 DECL_DELETED_FN (clone) = 1;
5706 DECL_DECLARED_INLINE_P (clone) = 1;
5707 DECL_INITIAL (clone) = error_mark_node;
5711 else if (init == ridpointers[(int)RID_DEFAULT])
5713 if (defaultable_fn_check (decl))
5714 DECL_DEFAULTED_FN (decl) = 1;
5716 DECL_INITIAL (decl) = NULL_TREE;
5720 if (processing_template_decl)
5722 bool type_dependent_p;
5724 /* Add this declaration to the statement-tree. */
5725 if (at_function_scope_p ())
5726 add_decl_expr (decl);
5728 type_dependent_p = dependent_type_p (type);
5730 if (check_for_bare_parameter_packs (init))
5733 DECL_INITIAL (decl) = NULL_TREE;
5736 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5738 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5739 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5740 TREE_CONSTANT (decl) = 1;
5743 /* Generally, initializers in templates are expanded when the
5744 template is instantiated. But, if DECL is an integral
5745 constant static data member, then it can be used in future
5746 integral constant expressions, and its value must be
5749 && DECL_CLASS_SCOPE_P (decl)
5750 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5751 && !type_dependent_p
5752 && !value_dependent_init_p (init)))
5755 DECL_INITIAL (decl) = init;
5756 if (TREE_CODE (decl) == VAR_DECL
5757 && !DECL_PRETTY_FUNCTION_P (decl)
5758 && !type_dependent_p)
5759 maybe_deduce_size_from_array_init (decl, init);
5763 if (TREE_CODE (init) == TREE_LIST)
5765 /* If the parenthesized-initializer form was used (e.g.,
5766 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5767 arguments. (There is generally only one.) We convert them
5770 for (; list; list = TREE_CHAIN (list))
5772 tree elt = TREE_VALUE (list);
5773 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5777 init = fold_non_dependent_expr (init);
5778 processing_template_decl = 0;
5781 /* Take care of TYPE_DECLs up front. */
5782 if (TREE_CODE (decl) == TYPE_DECL)
5784 if (type != error_mark_node
5785 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5787 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5788 warning (0, "shadowing previous type declaration of %q#D", decl);
5789 set_identifier_type_value (DECL_NAME (decl), decl);
5792 /* If we have installed this as the canonical typedef for this
5793 type, and that type has not been defined yet, delay emitting
5794 the debug information for it, as we will emit it later. */
5795 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5796 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5797 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5799 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl),
5804 /* A reference will be modified here, as it is initialized. */
5805 if (! DECL_EXTERNAL (decl)
5806 && TREE_READONLY (decl)
5807 && TREE_CODE (type) == REFERENCE_TYPE)
5810 TREE_READONLY (decl) = 0;
5813 if (TREE_CODE (decl) == VAR_DECL)
5815 /* Only variables with trivial initialization and destruction can
5816 have thread-local storage. */
5817 if (DECL_THREAD_LOCAL_P (decl)
5818 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5819 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5820 error ("%qD cannot be thread-local because it has non-trivial "
5821 "type %qT", decl, TREE_TYPE (decl));
5822 /* If this is a local variable that will need a mangled name,
5823 register it now. We must do this before processing the
5824 initializer for the variable, since the initialization might
5825 require a guard variable, and since the mangled name of the
5826 guard variable will depend on the mangled name of this
5828 if (DECL_FUNCTION_SCOPE_P (decl)
5829 && TREE_STATIC (decl)
5830 && !DECL_ARTIFICIAL (decl))
5832 push_local_name (decl);
5833 if (DECL_CONSTRUCTOR_P (current_function_decl)
5834 || DECL_DESTRUCTOR_P (current_function_decl))
5835 /* Normally local_decls is populated during GIMPLE lowering,
5836 but [cd]tors are never actually compiled directly. We need
5837 to put statics on the list so we can deal with the label
5838 address extension. */
5839 add_local_decl (cfun, decl);
5842 /* Convert the initializer to the type of DECL, if we have not
5843 already initialized DECL. */
5844 if (!DECL_INITIALIZED_P (decl)
5845 /* If !DECL_EXTERNAL then DECL is being defined. In the
5846 case of a static data member initialized inside the
5847 class-specifier, there can be an initializer even if DECL
5848 is *not* defined. */
5849 && (!DECL_EXTERNAL (decl) || init))
5851 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5854 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5855 /* Allow libjava/prims.cc define primitive classes. */
5856 if (init != NULL_TREE
5857 || jclass == NULL_TREE
5858 || TREE_CODE (jclass) != TYPE_DECL
5859 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5860 || !same_type_ignoring_top_level_qualifiers_p
5861 (type, TREE_TYPE (TREE_TYPE (jclass))))
5862 error ("Java object %qD not allocated with %<new%>", decl);
5867 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5868 if (init_const_expr_p)
5870 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5871 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5872 TREE_CONSTANT (decl) = 1;
5875 init = check_initializer (decl, init, flags, &cleanup);
5876 /* Thread-local storage cannot be dynamically initialized. */
5877 if (DECL_THREAD_LOCAL_P (decl) && init)
5879 error ("%qD is thread-local and so cannot be dynamically "
5880 "initialized", decl);
5884 /* Check that the initializer for a static data member was a
5885 constant. Although we check in the parser that the
5886 initializer is an integral constant expression, we do not
5887 simplify division-by-zero at the point at which it
5888 occurs. Therefore, in:
5890 struct S { static const int i = 7 / 0; };
5892 we issue an error at this point. It would
5893 probably be better to forbid division by zero in
5894 integral constant expressions. */
5895 if (DECL_EXTERNAL (decl) && init)
5897 error ("%qD cannot be initialized by a non-constant expression"
5898 " when being declared", decl);
5899 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5907 The memory occupied by any object of static storage
5908 duration is zero-initialized at program startup before
5909 any other initialization takes place.
5911 We cannot create an appropriate initializer until after
5912 the type of DECL is finalized. If DECL_INITIAL is set,
5913 then the DECL is statically initialized, and any
5914 necessary zero-initialization has already been performed. */
5915 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5916 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5917 /*nelts=*/NULL_TREE,
5918 /*static_storage_p=*/true);
5919 /* Remember that the initialization for this variable has
5921 DECL_INITIALIZED_P (decl) = 1;
5922 /* This declaration is the definition of this variable,
5923 unless we are initializing a static data member within
5924 the class specifier. */
5925 if (!DECL_EXTERNAL (decl))
5926 var_definition_p = true;
5928 /* If the variable has an array type, lay out the type, even if
5929 there is no initializer. It is valid to index through the
5930 array, and we must get TYPE_ALIGN set correctly on the array
5932 else if (TREE_CODE (type) == ARRAY_TYPE)
5935 if (!processing_template_decl
5936 && TREE_STATIC (decl)
5937 && !at_function_scope_p ()
5938 && current_function_decl == NULL)
5939 /* So decl is a global variable or a static member of a
5940 non local class. Record the types it uses
5941 so that we can decide later to emit debug info for them. */
5942 record_types_used_by_current_var_decl (decl);
5944 else if (TREE_CODE (decl) == FIELD_DECL
5945 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5946 error ("non-static data member %qD has Java class type", decl);
5948 /* Add this declaration to the statement-tree. This needs to happen
5949 after the call to check_initializer so that the DECL_EXPR for a
5950 reference temp is added before the DECL_EXPR for the reference itself. */
5951 if (at_function_scope_p ())
5952 add_decl_expr (decl);
5954 /* Let the middle end know about variables and functions -- but not
5955 static data members in uninstantiated class templates. */
5956 if (!saved_processing_template_decl
5957 && (TREE_CODE (decl) == VAR_DECL
5958 || TREE_CODE (decl) == FUNCTION_DECL))
5960 if (TREE_CODE (decl) == VAR_DECL)
5962 layout_var_decl (decl);
5963 maybe_commonize_var (decl);
5966 /* This needs to happen after the linkage is set. */
5967 determine_visibility (decl);
5969 if (var_definition_p && TREE_STATIC (decl))
5971 /* If a TREE_READONLY variable needs initialization
5972 at runtime, it is no longer readonly and we need to
5973 avoid MEM_READONLY_P being set on RTL created for it. */
5976 if (TREE_READONLY (decl))
5977 TREE_READONLY (decl) = 0;
5980 else if (was_readonly)
5981 TREE_READONLY (decl) = 1;
5984 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5986 /* Check for abstractness of the type. Notice that there is no
5987 need to strip array types here since the check for those types
5988 is already done within create_array_type_for_decl. */
5989 if (TREE_CODE (type) == FUNCTION_TYPE
5990 || TREE_CODE (type) == METHOD_TYPE)
5991 abstract_virtuals_error (decl, TREE_TYPE (type));
5993 abstract_virtuals_error (decl, type);
5995 if (TREE_TYPE (decl) == error_mark_node)
5996 /* No initialization required. */
5998 else if (TREE_CODE (decl) == FUNCTION_DECL)
6002 if (init == ridpointers[(int)RID_DEFAULT])
6004 /* An out-of-class default definition is defined at
6005 the point where it is explicitly defaulted. */
6006 if (DECL_INITIAL (decl) == error_mark_node)
6007 synthesize_method (decl);
6010 error ("function %q#D is initialized like a variable", decl);
6012 /* else no initialization required. */
6014 else if (DECL_EXTERNAL (decl)
6015 && ! (DECL_LANG_SPECIFIC (decl)
6016 && DECL_NOT_REALLY_EXTERN (decl)))
6019 DECL_INITIAL (decl) = init;
6021 /* A variable definition. */
6022 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
6023 /* Initialize the local variable. */
6024 initialize_local_var (decl, init);
6026 /* If a variable is defined, and then a subsequent
6027 definition with external linkage is encountered, we will
6028 get here twice for the same variable. We want to avoid
6029 calling expand_static_init more than once. For variables
6030 that are not static data members, we can call
6031 expand_static_init only when we actually process the
6032 initializer. It is not legal to redeclare a static data
6033 member, so this issue does not arise in that case. */
6034 else if (var_definition_p && TREE_STATIC (decl))
6035 expand_static_init (decl, init);
6038 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
6039 reference, insert it in the statement-tree now. */
6041 push_cleanup (decl, cleanup, false);
6044 processing_template_decl = saved_processing_template_decl;
6047 TREE_READONLY (decl) = 1;
6050 /* Returns a declaration for a VAR_DECL as if:
6052 extern "C" TYPE NAME;
6054 had been seen. Used to create compiler-generated global
6058 declare_global_var (tree name, tree type)
6062 push_to_top_level ();
6063 decl = build_decl (input_location, VAR_DECL, name, type);
6064 TREE_PUBLIC (decl) = 1;
6065 DECL_EXTERNAL (decl) = 1;
6066 DECL_ARTIFICIAL (decl) = 1;
6067 /* If the user has explicitly declared this variable (perhaps
6068 because the code we are compiling is part of a low-level runtime
6069 library), then it is possible that our declaration will be merged
6070 with theirs by pushdecl. */
6071 decl = pushdecl (decl);
6072 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6073 pop_from_top_level ();
6078 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6079 if "__cxa_atexit" is not being used) corresponding to the function
6080 to be called when the program exits. */
6083 get_atexit_fn_ptr_type (void)
6087 if (!atexit_fn_ptr_type_node)
6090 if (flag_use_cxa_atexit
6091 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6092 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6093 arg_type = ptr_type_node;
6095 /* The parameter to "atexit" is "void (*)(void)". */
6096 arg_type = NULL_TREE;
6098 fn_type = build_function_type_list (void_type_node,
6099 arg_type, NULL_TREE);
6100 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6103 return atexit_fn_ptr_type_node;
6106 /* Returns a pointer to the `atexit' function. Note that if
6107 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6108 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6111 get_atexit_node (void)
6117 bool use_aeabi_atexit;
6122 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6124 /* The declaration for `__cxa_atexit' is:
6126 int __cxa_atexit (void (*)(void *), void *, void *)
6128 We build up the argument types and then the function type
6130 tree argtype0, argtype1, argtype2;
6132 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6133 /* First, build the pointer-to-function type for the first
6135 fn_ptr_type = get_atexit_fn_ptr_type ();
6136 /* Then, build the rest of the argument types. */
6137 argtype2 = ptr_type_node;
6138 if (use_aeabi_atexit)
6140 argtype1 = fn_ptr_type;
6141 argtype0 = ptr_type_node;
6145 argtype1 = ptr_type_node;
6146 argtype0 = fn_ptr_type;
6148 /* And the final __cxa_atexit type. */
6149 fn_type = build_function_type_list (integer_type_node,
6150 argtype0, argtype1, argtype2,
6152 fn_ptr_type = build_pointer_type (fn_type);
6153 if (use_aeabi_atexit)
6154 name = "__aeabi_atexit";
6156 name = "__cxa_atexit";
6160 /* The declaration for `atexit' is:
6162 int atexit (void (*)());
6164 We build up the argument types and then the function type
6166 fn_ptr_type = get_atexit_fn_ptr_type ();
6167 /* Build the final atexit type. */
6168 fn_type = build_function_type_list (integer_type_node,
6169 fn_ptr_type, NULL_TREE);
6173 /* Now, build the function declaration. */
6174 push_lang_context (lang_name_c);
6175 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6176 mark_used (atexit_fndecl);
6177 pop_lang_context ();
6178 atexit_node = decay_conversion (atexit_fndecl);
6183 /* Returns the __dso_handle VAR_DECL. */
6186 get_dso_handle_node (void)
6188 if (dso_handle_node)
6189 return dso_handle_node;
6191 /* Declare the variable. */
6192 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6195 return dso_handle_node;
6198 /* Begin a new function with internal linkage whose job will be simply
6199 to destroy some particular variable. */
6201 static GTY(()) int start_cleanup_cnt;
6204 start_cleanup_fn (void)
6209 bool use_cxa_atexit = flag_use_cxa_atexit
6210 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6212 push_to_top_level ();
6214 /* No need to mangle this. */
6215 push_lang_context (lang_name_c);
6217 /* Build the name of the function. */
6218 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6219 /* Build the function declaration. */
6220 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6221 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6222 /* It's a function with internal linkage, generated by the
6224 TREE_PUBLIC (fndecl) = 0;
6225 DECL_ARTIFICIAL (fndecl) = 1;
6226 /* Make the function `inline' so that it is only emitted if it is
6227 actually needed. It is unlikely that it will be inlined, since
6228 it is only called via a function pointer, but we avoid unnecessary
6229 emissions this way. */
6230 DECL_DECLARED_INLINE_P (fndecl) = 1;
6231 DECL_INTERFACE_KNOWN (fndecl) = 1;
6232 /* Build the parameter. */
6237 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6238 DECL_CONTEXT (parmdecl) = fndecl;
6239 TREE_USED (parmdecl) = 1;
6240 DECL_READ_P (parmdecl) = 1;
6241 DECL_ARGUMENTS (fndecl) = parmdecl;
6245 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6247 pop_lang_context ();
6249 return current_function_decl;
6252 /* Finish the cleanup function begun by start_cleanup_fn. */
6255 end_cleanup_fn (void)
6257 expand_or_defer_fn (finish_function (0));
6259 pop_from_top_level ();
6262 /* Generate code to handle the destruction of DECL, an object with
6263 static storage duration. */
6266 register_dtor_fn (tree decl)
6273 tree arg0, arg1 = NULL_TREE, arg2 = NULL_TREE;
6275 type = TREE_TYPE (decl);
6276 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6277 return void_zero_node;
6279 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6280 a class object, we can just pass the destructor to
6281 "__cxa_atexit"; we don't have to build a temporary function to do
6283 use_dtor = (flag_use_cxa_atexit
6284 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6285 && CLASS_TYPE_P (type));
6290 /* Find the destructor. */
6291 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6292 gcc_assert (idx >= 0);
6293 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6294 /* Make sure it is accessible. */
6295 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6299 /* Call build_cleanup before we enter the anonymous function so
6300 that any access checks will be done relative to the current
6301 scope, rather than the scope of the anonymous function. */
6302 build_cleanup (decl);
6304 /* Now start the function. */
6305 cleanup = start_cleanup_fn ();
6307 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6308 to the original function, rather than the anonymous one. That
6309 will make the back end think that nested functions are in use,
6310 which causes confusion. */
6311 push_deferring_access_checks (dk_no_check);
6312 fcall = build_cleanup (decl);
6313 pop_deferring_access_checks ();
6315 /* Create the body of the anonymous function. */
6316 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6317 finish_expr_stmt (fcall);
6318 finish_compound_stmt (compound_stmt);
6322 /* Call atexit with the cleanup function. */
6323 mark_used (cleanup);
6324 cleanup = build_address (cleanup);
6325 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6331 /* We must convert CLEANUP to the type that "__cxa_atexit"
6333 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6334 /* "__cxa_atexit" will pass the address of DECL to the
6335 cleanup function. */
6337 addr = build_address (decl);
6338 /* The declared type of the parameter to "__cxa_atexit" is
6339 "void *". For plain "T*", we could just let the
6340 machinery in cp_build_function_call convert it -- but if the
6341 type is "cv-qualified T *", then we need to convert it
6342 before passing it in, to avoid spurious errors. */
6343 addr = build_nop (ptr_type_node, addr);
6346 /* Since the cleanup functions we build ignore the address
6347 they're given, there's no reason to pass the actual address
6348 in, and, in general, it's cheaper to pass NULL than any
6350 addr = null_pointer_node;
6351 arg2 = cp_build_addr_expr (get_dso_handle_node (),
6352 tf_warning_or_error);
6353 if (targetm.cxx.use_aeabi_atexit ())
6366 return cp_build_function_call_nary (get_atexit_node (), tf_warning_or_error,
6367 arg0, arg1, arg2, NULL_TREE);
6370 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6371 is its initializer. Generate code to handle the construction
6372 and destruction of DECL. */
6375 expand_static_init (tree decl, tree init)
6377 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6378 gcc_assert (TREE_STATIC (decl));
6380 /* Some variables require no initialization. */
6382 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6383 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6386 if (DECL_FUNCTION_SCOPE_P (decl))
6388 /* Emit code to perform this initialization but once. */
6389 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6390 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6391 tree guard, guard_addr;
6392 tree acquire_fn, release_fn, abort_fn;
6395 /* Emit code to perform this initialization but once. This code
6398 static <type> guard;
6399 if (!guard.first_byte) {
6400 if (__cxa_guard_acquire (&guard)) {
6403 // Do initialization.
6404 flag = true; __cxa_guard_release (&guard);
6405 // Register variable for destruction at end of program.
6407 if (!flag) __cxa_guard_abort (&guard);
6411 Note that the `flag' variable is only set to 1 *after* the
6412 initialization is complete. This ensures that an exception,
6413 thrown during the construction, will cause the variable to
6414 reinitialized when we pass through this code again, as per:
6418 If the initialization exits by throwing an exception, the
6419 initialization is not complete, so it will be tried again
6420 the next time control enters the declaration.
6422 This process should be thread-safe, too; multiple threads
6423 should not be able to initialize the variable more than
6426 /* Create the guard variable. */
6427 guard = get_guard (decl);
6429 /* This optimization isn't safe on targets with relaxed memory
6430 consistency. On such targets we force synchronization in
6431 __cxa_guard_acquire. */
6432 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6434 /* Begin the conditional initialization. */
6435 if_stmt = begin_if_stmt ();
6436 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6437 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6440 if (flag_threadsafe_statics)
6442 guard_addr = build_address (guard);
6444 acquire_fn = get_identifier ("__cxa_guard_acquire");
6445 release_fn = get_identifier ("__cxa_guard_release");
6446 abort_fn = get_identifier ("__cxa_guard_abort");
6447 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6449 tree vfntype = build_function_type_list (void_type_node,
6450 TREE_TYPE (guard_addr),
6452 acquire_fn = push_library_fn
6453 (acquire_fn, build_function_type_list (integer_type_node,
6454 TREE_TYPE (guard_addr),
6457 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6458 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6462 release_fn = identifier_global_value (release_fn);
6463 abort_fn = identifier_global_value (abort_fn);
6466 inner_if_stmt = begin_if_stmt ();
6467 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6470 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6471 begin = get_target_expr (boolean_false_node);
6472 flag = TARGET_EXPR_SLOT (begin);
6474 TARGET_EXPR_CLEANUP (begin)
6475 = build3 (COND_EXPR, void_type_node, flag,
6477 build_call_n (abort_fn, 1, guard_addr));
6478 CLEANUP_EH_ONLY (begin) = 1;
6480 /* Do the initialization itself. */
6481 init = add_stmt_to_compound (begin, init);
6482 init = add_stmt_to_compound
6483 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6484 init = add_stmt_to_compound
6485 (init, build_call_n (release_fn, 1, guard_addr));
6488 init = add_stmt_to_compound (init, set_guard (guard));
6490 /* Use atexit to register a function for destroying this static
6492 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6494 finish_expr_stmt (init);
6496 if (flag_threadsafe_statics)
6498 finish_compound_stmt (inner_then_clause);
6499 finish_then_clause (inner_if_stmt);
6500 finish_if_stmt (inner_if_stmt);
6503 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6505 finish_compound_stmt (then_clause);
6506 finish_then_clause (if_stmt);
6507 finish_if_stmt (if_stmt);
6511 static_aggregates = tree_cons (init, decl, static_aggregates);
6515 /* Make TYPE a complete type based on INITIAL_VALUE.
6516 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6517 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6518 3 if the initializer list is empty (in pedantic mode). */
6521 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6524 tree type, elt_type;
6528 unsigned HOST_WIDE_INT i;
6531 /* An array of character type can be initialized from a
6532 brace-enclosed string constant.
6534 FIXME: this code is duplicated from reshape_init. Probably
6535 we should just call reshape_init here? */
6536 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6537 && TREE_CODE (initial_value) == CONSTRUCTOR
6538 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6540 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6541 tree value = VEC_index (constructor_elt, v, 0)->value;
6543 if (TREE_CODE (value) == STRING_CST
6544 && VEC_length (constructor_elt, v) == 1)
6545 initial_value = value;
6548 /* If any of the elements are parameter packs, we can't actually
6549 complete this type now because the array size is dependent. */
6550 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6552 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6555 if (PACK_EXPANSION_P (value))
6561 failure = complete_array_type (ptype, initial_value, do_default);
6563 /* We can create the array before the element type is complete, which
6564 means that we didn't have these two bits set in the original type
6565 either. In completing the type, we are expected to propagate these
6566 bits. See also complete_type which does the same thing for arrays
6569 if (TYPE_DOMAIN (type))
6571 elt_type = TREE_TYPE (type);
6572 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6573 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6574 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6580 /* Return zero if something is declared to be a member of type
6581 CTYPE when in the context of CUR_TYPE. STRING is the error
6582 message to print in that case. Otherwise, quietly return 1. */
6585 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6587 if (ctype && ctype != cur_type)
6589 if (flags == DTOR_FLAG)
6590 error ("destructor for alien class %qT cannot be a member", ctype);
6592 error ("constructor for alien class %qT cannot be a member", ctype);
6598 /* Subroutine of `grokdeclarator'. */
6600 /* Generate errors possibly applicable for a given set of specifiers.
6601 This is for ARM $7.1.2. */
6604 bad_specifiers (tree object,
6605 enum bad_spec_place type,
6616 error ("%qD declared as a %<virtual%> variable", object);
6618 error ("%qD declared as an %<inline%> variable", object);
6620 error ("%<const%> and %<volatile%> function specifiers on "
6621 "%qD invalid in variable declaration", object);
6625 error ("%qD declared as a %<virtual%> parameter", object);
6627 error ("%qD declared as an %<inline%> parameter", object);
6629 error ("%<const%> and %<volatile%> function specifiers on "
6630 "%qD invalid in parameter declaration", object);
6634 error ("%qD declared as a %<virtual%> type", object);
6636 error ("%qD declared as an %<inline%> type", object);
6638 error ("%<const%> and %<volatile%> function specifiers on "
6639 "%qD invalid in type declaration", object);
6643 error ("%qD declared as a %<virtual%> field", object);
6645 error ("%qD declared as an %<inline%> field", object);
6647 error ("%<const%> and %<volatile%> function specifiers on "
6648 "%qD invalid in field declaration", object);
6654 error ("%q+D declared as a friend", object);
6656 && (TREE_CODE (object) == TYPE_DECL
6657 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6658 && !TYPE_REFFN_P (TREE_TYPE (object))
6659 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6660 error ("%q+D declared with an exception specification", object);
6663 /* DECL is a member function or static data member and is presently
6664 being defined. Check that the definition is taking place in a
6668 check_class_member_definition_namespace (tree decl)
6670 /* These checks only apply to member functions and static data
6672 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6673 || TREE_CODE (decl) == VAR_DECL);
6674 /* We check for problems with specializations in pt.c in
6675 check_specialization_namespace, where we can issue better
6677 if (processing_specialization)
6679 /* There are no restrictions on the placement of
6680 explicit instantiations. */
6681 if (processing_explicit_instantiation)
6685 A member function definition that appears outside of the
6686 class definition shall appear in a namespace scope enclosing
6687 the class definition.
6691 The definition for a static data member shall appear in a
6692 namespace scope enclosing the member's class definition. */
6693 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6694 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6695 decl, DECL_CONTEXT (decl));
6698 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6699 METHOD_TYPE for a non-static member function; QUALS are the
6700 cv-qualifiers that apply to the function. */
6703 build_this_parm (tree type, cp_cv_quals quals)
6708 cp_cv_quals this_quals;
6710 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6711 /* The `this' parameter is implicitly `const'; it cannot be
6713 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6714 qual_type = cp_build_qualified_type (this_type, this_quals);
6715 parm = build_artificial_parm (this_identifier, qual_type);
6716 cp_apply_type_quals_to_decl (this_quals, parm);
6720 /* CTYPE is class type, or null if non-class.
6721 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6723 DECLARATOR is the function's name.
6724 PARMS is a chain of PARM_DECLs for the function.
6725 VIRTUALP is truthvalue of whether the function is virtual or not.
6726 FLAGS are to be passed through to `grokclassfn'.
6727 QUALS are qualifiers indicating whether the function is `const'
6729 RAISES is a list of exceptions that this function can raise.
6730 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6731 not look, and -1 if we should not call `grokclassfn' at all.
6733 SFK is the kind of special function (if any) for the new function.
6735 Returns `NULL_TREE' if something goes wrong, after issuing
6736 applicable error messages. */
6739 grokfndecl (tree ctype,
6743 tree orig_declarator,
6745 enum overload_flags flags,
6752 special_function_kind sfk,
6757 location_t location)
6760 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6764 type = build_exception_variant (type, raises);
6766 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6768 /* If we have an explicit location, use it, otherwise use whatever
6769 build_lang_decl used (probably input_location). */
6770 if (location != UNKNOWN_LOCATION)
6771 DECL_SOURCE_LOCATION (decl) = location;
6773 if (TREE_CODE (type) == METHOD_TYPE)
6776 parm = build_this_parm (type, quals);
6777 DECL_CHAIN (parm) = parms;
6780 DECL_ARGUMENTS (decl) = parms;
6781 for (t = parms; t; t = DECL_CHAIN (t))
6782 DECL_CONTEXT (t) = decl;
6783 /* Propagate volatile out from type to decl. */
6784 if (TYPE_VOLATILE (type))
6785 TREE_THIS_VOLATILE (decl) = 1;
6787 /* Setup decl according to sfk. */
6790 case sfk_constructor:
6791 case sfk_copy_constructor:
6792 case sfk_move_constructor:
6793 DECL_CONSTRUCTOR_P (decl) = 1;
6795 case sfk_destructor:
6796 DECL_DESTRUCTOR_P (decl) = 1;
6802 /* If pointers to member functions use the least significant bit to
6803 indicate whether a function is virtual, ensure a pointer
6804 to this function will have that bit clear. */
6805 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6806 && TREE_CODE (type) == METHOD_TYPE
6807 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6808 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6811 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6815 ("defining explicit specialization %qD in friend declaration",
6819 tree fns = TREE_OPERAND (orig_declarator, 0);
6820 tree args = TREE_OPERAND (orig_declarator, 1);
6822 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6824 /* Something like `template <class T> friend void f<T>()'. */
6825 error ("invalid use of template-id %qD in declaration "
6826 "of primary template",
6832 /* A friend declaration of the form friend void f<>(). Record
6833 the information in the TEMPLATE_ID_EXPR. */
6834 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6836 if (TREE_CODE (fns) == COMPONENT_REF)
6838 /* Due to bison parser ickiness, we will have already looked
6839 up an operator_name or PFUNCNAME within the current class
6840 (see template_id in parse.y). If the current class contains
6841 such a name, we'll get a COMPONENT_REF here. Undo that. */
6843 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6844 == current_class_type);
6845 fns = TREE_OPERAND (fns, 1);
6847 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6848 || TREE_CODE (fns) == OVERLOAD);
6849 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6851 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6852 if (TREE_PURPOSE (t)
6853 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6855 error ("default arguments are not allowed in declaration "
6856 "of friend template specialization %qD",
6863 error ("%<inline%> is not allowed in declaration of friend "
6864 "template specialization %qD",
6871 /* If this decl has namespace scope, set that up. */
6873 set_decl_namespace (decl, in_namespace, friendp);
6875 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6877 /* `main' and builtins have implicit 'C' linkage. */
6878 if ((MAIN_NAME_P (declarator)
6879 || (IDENTIFIER_LENGTH (declarator) > 10
6880 && IDENTIFIER_POINTER (declarator)[0] == '_'
6881 && IDENTIFIER_POINTER (declarator)[1] == '_'
6882 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6883 && current_lang_name == lang_name_cplusplus
6884 && ctype == NULL_TREE
6885 && DECL_FILE_SCOPE_P (decl))
6886 SET_DECL_LANGUAGE (decl, lang_c);
6888 /* Should probably propagate const out from type to decl I bet (mrs). */
6891 DECL_STATIC_FUNCTION_P (decl) = 1;
6892 DECL_CONTEXT (decl) = ctype;
6897 DECL_CONTEXT (decl) = ctype;
6899 check_class_member_definition_namespace (decl);
6902 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6904 if (processing_template_decl)
6905 error ("cannot declare %<::main%> to be a template");
6907 error ("cannot declare %<::main%> to be inline");
6909 error ("cannot declare %<::main%> to be static");
6914 /* Members of anonymous types and local classes have no linkage; make
6915 them internal. If a typedef is made later, this will be changed. */
6916 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6917 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6920 if (publicp && cxx_dialect == cxx98)
6922 /* [basic.link]: A name with no linkage (notably, the name of a class
6923 or enumeration declared in a local scope) shall not be used to
6924 declare an entity with linkage.
6926 DR 757 relaxes this restriction for C++0x. */
6927 t = no_linkage_check (TREE_TYPE (decl),
6928 /*relaxed_p=*/false);
6931 if (TYPE_ANONYMOUS_P (t))
6933 if (DECL_EXTERN_C_P (decl))
6934 /* Allow this; it's pretty common in C. */;
6937 permerror (input_location, "anonymous type with no linkage "
6938 "used to declare function %q#D with linkage",
6940 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6941 permerror (input_location, "%q+#D does not refer to the unqualified "
6942 "type, so it is not used for linkage",
6947 permerror (input_location, "type %qT with no linkage used to "
6948 "declare function %q#D with linkage", t, decl);
6952 TREE_PUBLIC (decl) = publicp;
6955 DECL_INTERFACE_KNOWN (decl) = 1;
6956 DECL_NOT_REALLY_EXTERN (decl) = 1;
6959 /* If the declaration was declared inline, mark it as such. */
6961 DECL_DECLARED_INLINE_P (decl) = 1;
6963 DECL_EXTERNAL (decl) = 1;
6964 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6967 ? G_("static member function %qD cannot have cv-qualifier")
6968 : G_("non-member function %qD cannot have cv-qualifier"),
6970 quals = TYPE_UNQUALIFIED;
6973 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6974 && !grok_op_properties (decl, /*complain=*/true))
6978 /* Make the init_value nonzero so pushdecl knows this is not
6979 tentative. error_mark_node is replaced later with the BLOCK. */
6980 DECL_INITIAL (decl) = error_mark_node;
6982 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6983 TREE_NOTHROW (decl) = 1;
6985 /* Caller will do the rest of this. */
6989 if (ctype != NULL_TREE)
6990 grokclassfn (ctype, decl, flags);
6992 decl = check_explicit_specialization (orig_declarator, decl,
6995 4 * (friendp != 0));
6996 if (decl == error_mark_node)
7001 cplus_decl_attributes (&decl, *attrlist, 0);
7002 *attrlist = NULL_TREE;
7005 /* Check main's type after attributes have been applied. */
7006 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
7008 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
7011 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
7013 error ("%<::main%> must return %<int%>");
7014 newtype = build_function_type (integer_type_node, oldtypeargs);
7015 TREE_TYPE (decl) = newtype;
7018 check_main_parameter_types (decl);
7021 if (ctype != NULL_TREE
7022 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
7025 tree old_decl = check_classfn (ctype, decl,
7026 (processing_template_decl
7027 > template_class_depth (ctype))
7028 ? current_template_parms
7031 if (old_decl == error_mark_node)
7039 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
7040 /* Because grokfndecl is always supposed to return a
7041 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
7042 here. We depend on our callers to figure out that its
7043 really a template that's being returned. */
7044 old_decl = DECL_TEMPLATE_RESULT (old_decl);
7046 if (DECL_STATIC_FUNCTION_P (old_decl)
7047 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
7048 /* Remove the `this' parm added by grokclassfn.
7049 XXX Isn't this done in start_function, too? */
7050 revert_static_member_fn (decl);
7051 if (DECL_ARTIFICIAL (old_decl))
7053 error ("definition of implicitly-declared %qD", old_decl);
7057 /* Since we've smashed OLD_DECL to its
7058 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
7059 if (TREE_CODE (decl) == TEMPLATE_DECL)
7060 decl = DECL_TEMPLATE_RESULT (decl);
7062 /* Attempt to merge the declarations. This can fail, in
7063 the case of some invalid specialization declarations. */
7064 pushed_scope = push_scope (ctype);
7065 ok = duplicate_decls (decl, old_decl, friendp);
7067 pop_scope (pushed_scope);
7070 error ("no %q#D member function declared in class %qT",
7078 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
7081 if (ctype == NULL_TREE || check)
7085 DECL_VIRTUAL_P (decl) = 1;
7090 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
7091 the linkage that DECL will receive in the object file. */
7094 set_linkage_for_static_data_member (tree decl)
7096 /* A static data member always has static storage duration and
7097 external linkage. Note that static data members are forbidden in
7098 local classes -- the only situation in which a class has
7099 non-external linkage. */
7100 TREE_PUBLIC (decl) = 1;
7101 TREE_STATIC (decl) = 1;
7102 /* For non-template classes, static data members are always put
7103 out in exactly those files where they are defined, just as
7104 with ordinary namespace-scope variables. */
7105 if (!processing_template_decl)
7106 DECL_INTERFACE_KNOWN (decl) = 1;
7109 /* Create a VAR_DECL named NAME with the indicated TYPE.
7111 If SCOPE is non-NULL, it is the class type or namespace containing
7112 the variable. If SCOPE is NULL, the variable should is created in
7113 the innermost enclosings scope. */
7116 grokvardecl (tree type,
7118 const cp_decl_specifier_seq *declspecs,
7124 tree explicit_scope;
7126 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7128 /* Compute the scope in which to place the variable, but remember
7129 whether or not that scope was explicitly specified by the user. */
7130 explicit_scope = scope;
7133 /* An explicit "extern" specifier indicates a namespace-scope
7135 if (declspecs->storage_class == sc_extern)
7136 scope = current_decl_namespace ();
7137 else if (!at_function_scope_p ())
7138 scope = current_scope ();
7142 && (/* If the variable is a namespace-scope variable declared in a
7143 template, we need DECL_LANG_SPECIFIC. */
7144 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7145 /* Similarly for namespace-scope variables with language linkage
7147 || (TREE_CODE (scope) == NAMESPACE_DECL
7148 && current_lang_name != lang_name_cplusplus)
7149 /* Similarly for static data members. */
7151 decl = build_lang_decl (VAR_DECL, name, type);
7153 decl = build_decl (input_location, VAR_DECL, name, type);
7155 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7156 set_decl_namespace (decl, explicit_scope, 0);
7158 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7160 if (declspecs->storage_class == sc_extern)
7162 DECL_THIS_EXTERN (decl) = 1;
7163 DECL_EXTERNAL (decl) = !initialized;
7166 if (DECL_CLASS_SCOPE_P (decl))
7168 set_linkage_for_static_data_member (decl);
7169 /* This function is only called with out-of-class definitions. */
7170 DECL_EXTERNAL (decl) = 0;
7171 check_class_member_definition_namespace (decl);
7173 /* At top level, either `static' or no s.c. makes a definition
7174 (perhaps tentative), and absence of `static' makes it public. */
7175 else if (toplevel_bindings_p ())
7177 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7178 && (DECL_THIS_EXTERN (decl) || ! constp));
7179 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7181 /* Not at top level, only `static' makes a static definition. */
7184 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7185 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7188 if (declspecs->specs[(int)ds_thread])
7189 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7191 /* If the type of the decl has no linkage, make sure that we'll
7192 notice that in mark_used. */
7193 if (cxx_dialect > cxx98
7194 && decl_linkage (decl) != lk_none
7195 && DECL_LANG_SPECIFIC (decl) == NULL
7196 && !DECL_EXTERN_C_P (decl)
7197 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7198 retrofit_lang_decl (decl);
7200 if (TREE_PUBLIC (decl))
7202 /* [basic.link]: A name with no linkage (notably, the name of a class
7203 or enumeration declared in a local scope) shall not be used to
7204 declare an entity with linkage.
7206 DR 757 relaxes this restriction for C++0x. */
7207 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7208 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7211 if (TYPE_ANONYMOUS_P (t))
7213 if (DECL_EXTERN_C_P (decl))
7214 /* Allow this; it's pretty common in C. */
7218 /* DRs 132, 319 and 389 seem to indicate types with
7219 no linkage can only be used to declare extern "C"
7220 entities. Since it's not always an error in the
7221 ISO C++ 90 Standard, we only issue a warning. */
7222 warning (0, "anonymous type with no linkage used to declare "
7223 "variable %q#D with linkage", decl);
7224 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7225 warning (0, "%q+#D does not refer to the unqualified "
7226 "type, so it is not used for linkage",
7231 warning (0, "type %qT with no linkage used to declare variable "
7232 "%q#D with linkage", t, decl);
7236 DECL_INTERFACE_KNOWN (decl) = 1;
7241 /* Create and return a canonical pointer to member function type, for
7242 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7245 build_ptrmemfunc_type (tree type)
7249 tree unqualified_variant = NULL_TREE;
7251 if (type == error_mark_node)
7254 /* If a canonical type already exists for this type, use it. We use
7255 this method instead of type_hash_canon, because it only does a
7256 simple equality check on the list of field members. */
7258 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7261 /* Make sure that we always have the unqualified pointer-to-member
7263 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7265 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7267 t = make_class_type (RECORD_TYPE);
7268 xref_basetypes (t, NULL_TREE);
7270 /* Let the front end know this is a pointer to member function... */
7271 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7272 /* ... and not really a class type. */
7273 SET_CLASS_TYPE_P (t, 0);
7275 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7278 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7280 DECL_CHAIN (field) = fields;
7283 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7285 /* Zap out the name so that the back end will give us the debugging
7286 information for this anonymous RECORD_TYPE. */
7287 TYPE_NAME (t) = NULL_TREE;
7289 /* If this is not the unqualified form of this pointer-to-member
7290 type, set the TYPE_MAIN_VARIANT for this type to be the
7291 unqualified type. Since they are actually RECORD_TYPEs that are
7292 not variants of each other, we must do this manually.
7293 As we just built a new type there is no need to do yet another copy. */
7294 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7296 int type_quals = cp_type_quals (type);
7297 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7298 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7299 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7300 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7301 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7302 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7303 TREE_TYPE (TYPE_BINFO (t)) = t;
7306 /* Cache this pointer-to-member type so that we can find it again
7308 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7310 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7311 SET_TYPE_STRUCTURAL_EQUALITY (t);
7312 else if (TYPE_CANONICAL (type) != type)
7313 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7318 /* Create and return a pointer to data member type. */
7321 build_ptrmem_type (tree class_type, tree member_type)
7323 if (TREE_CODE (member_type) == METHOD_TYPE)
7325 cp_cv_quals quals = type_memfn_quals (member_type);
7326 member_type = build_memfn_type (member_type, class_type, quals);
7327 return build_ptrmemfunc_type (build_pointer_type (member_type));
7331 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7332 return build_offset_type (class_type, member_type);
7336 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7337 Check to see that the definition is valid. Issue appropriate error
7338 messages. Return 1 if the definition is particularly bad, or 0
7342 check_static_variable_definition (tree decl, tree type)
7344 /* Motion 10 at San Diego: If a static const integral data member is
7345 initialized with an integral constant expression, the initializer
7346 may appear either in the declaration (within the class), or in
7347 the definition, but not both. If it appears in the class, the
7348 member is a member constant. The file-scope definition is always
7350 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7352 error ("invalid in-class initialization of static data member "
7353 "of non-integral type %qT",
7355 /* If we just return the declaration, crashes will sometimes
7356 occur. We therefore return void_type_node, as if this were a
7357 friend declaration, to cause callers to completely ignore
7358 this declaration. */
7361 else if (!CP_TYPE_CONST_P (type))
7362 error ("ISO C++ forbids in-class initialization of non-const "
7363 "static member %qD",
7365 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7366 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7367 "%qD of non-integral type %qT", decl, type);
7372 /* Given the SIZE (i.e., number of elements) in an array, compute an
7373 appropriate index type for the array. If non-NULL, NAME is the
7374 name of the thing being declared. */
7377 compute_array_index_type (tree name, tree size)
7381 tree abi_1_itype = NULL_TREE;
7383 if (error_operand_p (size))
7384 return error_mark_node;
7386 type = TREE_TYPE (size);
7387 /* The array bound must be an integer type. */
7388 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7391 error ("size of array %qD has non-integral type %qT", name, type);
7393 error ("size of array has non-integral type %qT", type);
7394 size = integer_one_node;
7395 type = TREE_TYPE (size);
7398 /* A type is dependent if it is...an array type constructed from any
7399 dependent type or whose size is specified by a constant expression
7400 that is value-dependent. */
7401 /* We can only call value_dependent_expression_p on integral constant
7402 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7403 set if this isn't one. */
7404 if (processing_template_decl
7405 && (dependent_type_p (type)
7406 || TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7408 /* We cannot do any checking for a SIZE that isn't known to be
7409 constant. Just build the index type and mark that it requires
7410 structural equality checks. */
7411 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7412 size, integer_one_node));
7413 TYPE_DEPENDENT_P (itype) = 1;
7414 TYPE_DEPENDENT_P_VALID (itype) = 1;
7415 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7419 if (!abi_version_at_least (2) && processing_template_decl)
7420 /* For abi-1, we handled all instances in templates the same way,
7421 even when they were non-dependent. This affects the manglings
7422 produced. So, we do the normal checking for non-dependent
7423 sizes, but at the end we'll return the same type that abi-1
7424 would have, but with TYPE_CANONICAL set to the "right"
7425 value that the current ABI would provide. */
7426 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7427 size, integer_one_node));
7429 /* The size might be the result of a cast. */
7430 STRIP_TYPE_NOPS (size);
7432 size = mark_rvalue_use (size);
7434 /* It might be a const variable or enumeration constant. */
7435 size = integral_constant_value (size);
7436 if (error_operand_p (size))
7437 return error_mark_node;
7439 /* Normally, the array-bound will be a constant. */
7440 if (TREE_CODE (size) == INTEGER_CST)
7442 /* Check to see if the array bound overflowed. Make that an
7443 error, no matter how generous we're being. */
7444 constant_expression_error (size);
7446 /* An array must have a positive number of elements. */
7447 if (INT_CST_LT (size, integer_zero_node))
7450 error ("size of array %qD is negative", name);
7452 error ("size of array is negative");
7453 size = integer_one_node;
7455 /* As an extension we allow zero-sized arrays. We always allow
7456 them in system headers because glibc uses them. */
7457 else if (integer_zerop (size) && !in_system_header)
7460 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7462 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7465 else if (TREE_CONSTANT (size))
7467 /* `(int) &fn' is not a valid array bound. */
7469 error ("size of array %qD is not an integral constant-expression",
7472 error ("size of array is not an integral constant-expression");
7473 size = integer_one_node;
7475 else if (pedantic && warn_vla != 0)
7478 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7480 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7482 else if (warn_vla > 0)
7486 "variable length array %qD is used", name);
7489 "variable length array is used");
7492 if (processing_template_decl && !TREE_CONSTANT (size))
7493 /* A variable sized array. */
7494 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7497 HOST_WIDE_INT saved_processing_template_decl;
7499 /* Compute the index of the largest element in the array. It is
7500 one less than the number of elements in the array. We save
7501 and restore PROCESSING_TEMPLATE_DECL so that computations in
7502 cp_build_binary_op will be appropriately folded. */
7503 saved_processing_template_decl = processing_template_decl;
7504 processing_template_decl = 0;
7505 itype = cp_build_binary_op (input_location,
7507 cp_convert (ssizetype, size),
7508 cp_convert (ssizetype, integer_one_node),
7509 tf_warning_or_error);
7510 itype = fold (itype);
7511 processing_template_decl = saved_processing_template_decl;
7513 if (!TREE_CONSTANT (itype))
7514 /* A variable sized array. */
7515 itype = variable_size (itype);
7516 /* Make sure that there was no overflow when creating to a signed
7517 index type. (For example, on a 32-bit machine, an array with
7518 size 2^32 - 1 is too big.) */
7519 else if (TREE_CODE (itype) == INTEGER_CST
7520 && TREE_OVERFLOW (itype))
7522 error ("overflow in array dimension");
7523 TREE_OVERFLOW (itype) = 0;
7527 /* Create and return the appropriate index type. */
7530 tree t = build_index_type (itype);
7531 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7532 itype = abi_1_itype;
7535 itype = build_index_type (itype);
7537 /* If the index type were dependent, we would have returned early, so
7538 remember that it isn't. */
7539 TYPE_DEPENDENT_P (itype) = 0;
7540 TYPE_DEPENDENT_P_VALID (itype) = 1;
7544 /* Returns the scope (if any) in which the entity declared by
7545 DECLARATOR will be located. If the entity was declared with an
7546 unqualified name, NULL_TREE is returned. */
7549 get_scope_of_declarator (const cp_declarator *declarator)
7551 while (declarator && declarator->kind != cdk_id)
7552 declarator = declarator->declarator;
7554 /* If the declarator-id is a SCOPE_REF, the scope in which the
7555 declaration occurs is the first operand. */
7557 && declarator->u.id.qualifying_scope)
7558 return declarator->u.id.qualifying_scope;
7560 /* Otherwise, the declarator is not a qualified name; the entity will
7561 be declared in the current scope. */
7565 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7566 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7570 create_array_type_for_decl (tree name, tree type, tree size)
7572 tree itype = NULL_TREE;
7574 /* If things have already gone awry, bail now. */
7575 if (type == error_mark_node || size == error_mark_node)
7576 return error_mark_node;
7578 /* If there are some types which cannot be array elements,
7579 issue an error-message and return. */
7580 switch (TREE_CODE (type))
7584 error ("declaration of %qD as array of void", name);
7586 error ("creating array of void");
7587 return error_mark_node;
7591 error ("declaration of %qD as array of functions", name);
7593 error ("creating array of functions");
7594 return error_mark_node;
7596 case REFERENCE_TYPE:
7598 error ("declaration of %qD as array of references", name);
7600 error ("creating array of references");
7601 return error_mark_node;
7605 error ("declaration of %qD as array of function members", name);
7607 error ("creating array of function members");
7608 return error_mark_node;
7616 The constant expressions that specify the bounds of the arrays
7617 can be omitted only for the first member of the sequence. */
7618 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7621 error ("declaration of %qD as multidimensional array must "
7622 "have bounds for all dimensions except the first",
7625 error ("multidimensional array must have bounds for all "
7626 "dimensions except the first");
7628 return error_mark_node;
7631 /* Figure out the index type for the array. */
7633 itype = compute_array_index_type (name, size);
7636 T is called the array element type; this type shall not be [...] an
7637 abstract class type. */
7638 abstract_virtuals_error (name, type);
7640 return build_cplus_array_type (type, itype);
7643 /* Check that it's OK to declare a function with the indicated TYPE.
7644 SFK indicates the kind of special function (if any) that this
7645 function is. OPTYPE is the type given in a conversion operator
7646 declaration, or the class type for a constructor/destructor.
7647 Returns the actual return type of the function; that
7648 may be different than TYPE if an error occurs, or for certain
7649 special functions. */
7652 check_special_function_return_type (special_function_kind sfk,
7658 case sfk_constructor:
7660 error ("return type specification for constructor invalid");
7662 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7663 type = build_pointer_type (optype);
7665 type = void_type_node;
7668 case sfk_destructor:
7670 error ("return type specification for destructor invalid");
7671 /* We can't use the proper return type here because we run into
7672 problems with ambiguous bases and covariant returns.
7673 Java classes are left unchanged because (void *) isn't a valid
7674 Java type, and we don't want to change the Java ABI. */
7675 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7676 type = build_pointer_type (void_type_node);
7678 type = void_type_node;
7681 case sfk_conversion:
7683 error ("return type specified for %<operator %T%>", optype);
7694 /* A variable or data member (whose unqualified name is IDENTIFIER)
7695 has been declared with the indicated TYPE. If the TYPE is not
7696 acceptable, issue an error message and return a type to use for
7697 error-recovery purposes. */
7700 check_var_type (tree identifier, tree type)
7702 if (VOID_TYPE_P (type))
7705 error ("unnamed variable or field declared void");
7706 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7708 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7709 error ("variable or field %qE declared void", identifier);
7712 error ("variable or field declared void");
7713 type = error_mark_node;
7719 /* Given declspecs and a declarator (abstract or otherwise), determine
7720 the name and type of the object declared and construct a DECL node
7723 DECLSPECS points to the representation of declaration-specifier
7724 sequence that precedes declarator.
7726 DECL_CONTEXT says which syntactic context this declaration is in:
7727 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7728 FUNCDEF for a function definition. Like NORMAL but a few different
7729 error messages in each case. Return value may be zero meaning
7730 this definition is too screwy to try to parse.
7731 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7732 handle member functions (which have FIELD context).
7733 Return value may be zero meaning this definition is too screwy to
7735 PARM for a parameter declaration (either within a function prototype
7736 or before a function body). Make a PARM_DECL, or return void_type_node.
7737 TPARM for a template parameter declaration.
7738 CATCHPARM for a parameter declaration before a catch clause.
7739 TYPENAME if for a typename (in a cast or sizeof).
7740 Don't make a DECL node; just return the ..._TYPE node.
7741 FIELD for a struct or union field; make a FIELD_DECL.
7742 BITFIELD for a field with specified width.
7744 INITIALIZED is as for start_decl.
7746 ATTRLIST is a pointer to the list of attributes, which may be NULL
7747 if there are none; *ATTRLIST may be modified if attributes from inside
7748 the declarator should be applied to the declaration.
7750 When this function is called, scoping variables (such as
7751 CURRENT_CLASS_TYPE) should reflect the scope in which the
7752 declaration occurs, not the scope in which the new declaration will
7753 be placed. For example, on:
7757 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7760 Returns a DECL (if a declarator is present), a TYPE (if there is no
7761 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7765 grokdeclarator (const cp_declarator *declarator,
7766 const cp_decl_specifier_seq *declspecs,
7767 enum decl_context decl_context,
7771 tree type = NULL_TREE;
7773 int explicit_int128 = 0;
7774 int virtualp, explicitp, friendp, inlinep, staticp;
7775 int explicit_int = 0;
7776 int explicit_char = 0;
7777 int defaulted_int = 0;
7778 tree dependent_name = NULL_TREE;
7780 tree typedef_decl = NULL_TREE;
7781 const char *name = NULL;
7782 tree typedef_type = NULL_TREE;
7783 /* True if this declarator is a function definition. */
7784 bool funcdef_flag = false;
7785 cp_declarator_kind innermost_code = cdk_error;
7788 /* See the code below that used this. */
7789 tree decl_attr = NULL_TREE;
7792 /* Keep track of what sort of function is being processed
7793 so that we can warn about default return values, or explicit
7794 return values which do not match prescribed defaults. */
7795 special_function_kind sfk = sfk_none;
7797 tree dname = NULL_TREE;
7798 tree ctor_return_type = NULL_TREE;
7799 enum overload_flags flags = NO_SPECIAL;
7800 /* cv-qualifiers that apply to the declarator, for a declaration of
7801 a member function. */
7802 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7803 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7805 tree raises = NULL_TREE;
7806 int template_count = 0;
7807 tree returned_attrs = NULL_TREE;
7808 tree parms = NULL_TREE;
7809 const cp_declarator *id_declarator;
7810 /* The unqualified name of the declarator; either an
7811 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7812 tree unqualified_id;
7813 /* The class type, if any, in which this entity is located,
7814 or NULL_TREE if none. Note that this value may be different from
7815 the current class type; for example if an attempt is made to declare
7816 "A::f" inside "B", this value will be "A". */
7817 tree ctype = current_class_type;
7818 /* The NAMESPACE_DECL for the namespace in which this entity is
7819 located. If an unqualified name is used to declare the entity,
7820 this value will be NULL_TREE, even if the entity is located at
7822 tree in_namespace = NULL_TREE;
7823 cp_storage_class storage_class;
7824 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7825 bool type_was_error_mark_node = false;
7826 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7827 bool template_type_arg = false;
7828 bool template_parm_flag = false;
7829 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7832 signed_p = declspecs->specs[(int)ds_signed];
7833 unsigned_p = declspecs->specs[(int)ds_unsigned];
7834 short_p = declspecs->specs[(int)ds_short];
7835 long_p = declspecs->specs[(int)ds_long];
7836 longlong = declspecs->specs[(int)ds_long] >= 2;
7837 explicit_int128 = declspecs->explicit_int128_p;
7838 thread_p = declspecs->specs[(int)ds_thread];
7840 if (decl_context == FUNCDEF)
7841 funcdef_flag = true, decl_context = NORMAL;
7842 else if (decl_context == MEMFUNCDEF)
7843 funcdef_flag = true, decl_context = FIELD;
7844 else if (decl_context == BITFIELD)
7845 bitfield = 1, decl_context = FIELD;
7846 else if (decl_context == TEMPLATE_TYPE_ARG)
7847 template_type_arg = true, decl_context = TYPENAME;
7848 else if (decl_context == TPARM)
7849 template_parm_flag = true, decl_context = PARM;
7851 if (initialized > 1)
7852 funcdef_flag = true;
7854 /* Look inside a declarator for the name being declared
7855 and get it as a string, for an error message. */
7856 for (id_declarator = declarator;
7858 id_declarator = id_declarator->declarator)
7860 if (id_declarator->kind != cdk_id)
7861 innermost_code = id_declarator->kind;
7863 switch (id_declarator->kind)
7866 if (id_declarator->declarator
7867 && id_declarator->declarator->kind == cdk_id)
7869 sfk = id_declarator->declarator->u.id.sfk;
7870 if (sfk == sfk_destructor)
7877 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7878 tree decl = id_declarator->u.id.unqualified_name;
7881 if (qualifying_scope)
7883 if (at_function_scope_p ())
7887 A declarator-id shall not be qualified except
7890 None of the cases are permitted in block
7892 if (qualifying_scope == global_namespace)
7893 error ("invalid use of qualified-name %<::%D%>",
7895 else if (TYPE_P (qualifying_scope))
7896 error ("invalid use of qualified-name %<%T::%D%>",
7897 qualifying_scope, decl);
7899 error ("invalid use of qualified-name %<%D::%D%>",
7900 qualifying_scope, decl);
7901 return error_mark_node;
7903 else if (TYPE_P (qualifying_scope))
7905 ctype = qualifying_scope;
7906 if (innermost_code != cdk_function
7907 && current_class_type
7908 && !UNIQUELY_DERIVED_FROM_P (ctype,
7909 current_class_type))
7911 error ("type %qT is not derived from type %qT",
7912 ctype, current_class_type);
7913 return error_mark_node;
7916 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7917 in_namespace = qualifying_scope;
7919 switch (TREE_CODE (decl))
7925 if (innermost_code != cdk_function)
7927 error ("declaration of %qD as non-function", decl);
7928 return error_mark_node;
7930 else if (!qualifying_scope
7931 && !(current_class_type && at_class_scope_p ()))
7933 error ("declaration of %qD as non-member", decl);
7934 return error_mark_node;
7937 type = TREE_OPERAND (decl, 0);
7939 type = constructor_name (type);
7940 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7945 case TEMPLATE_ID_EXPR:
7947 tree fns = TREE_OPERAND (decl, 0);
7950 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7952 gcc_assert (is_overloaded_fn (dname));
7953 dname = DECL_NAME (get_first_fn (dname));
7958 case IDENTIFIER_NODE:
7959 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7962 if (C_IS_RESERVED_WORD (dname))
7964 error ("declarator-id missing; using reserved word %qD",
7966 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7968 else if (!IDENTIFIER_TYPENAME_P (dname))
7969 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7972 gcc_assert (flags == NO_SPECIAL);
7973 flags = TYPENAME_FLAG;
7974 ctor_return_type = TREE_TYPE (dname);
7975 sfk = sfk_conversion;
7976 if (is_typename_at_global_scope (dname))
7977 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7979 name = "<invalid operator>";
7996 return error_mark_node;
8001 if (id_declarator->kind == cdk_id)
8007 The declarator in a function-definition shall have the form
8008 D1 ( parameter-declaration-clause) ... */
8009 if (funcdef_flag && innermost_code != cdk_function)
8011 error ("function definition does not declare parameters");
8012 return error_mark_node;
8015 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
8016 && innermost_code != cdk_function
8017 && ! (ctype && !declspecs->any_specifiers_p))
8019 error ("declaration of %qD as non-function", dname);
8020 return error_mark_node;
8023 /* Anything declared one level down from the top level
8024 must be one of the parameters of a function
8025 (because the body is at least two levels down). */
8027 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
8028 by not allowing C++ class definitions to specify their parameters
8029 with xdecls (must be spec.d in the parmlist).
8031 Since we now wait to push a class scope until we are sure that
8032 we are in a legitimate method context, we must set oldcname
8033 explicitly (since current_class_name is not yet alive).
8035 We also want to avoid calling this a PARM if it is in a namespace. */
8037 if (decl_context == NORMAL && !toplevel_bindings_p ())
8039 struct cp_binding_level *b = current_binding_level;
8040 current_binding_level = b->level_chain;
8041 if (current_binding_level != 0 && toplevel_bindings_p ())
8042 decl_context = PARM;
8043 current_binding_level = b;
8047 name = decl_context == PARM ? "parameter" : "type name";
8049 /* If there were multiple types specified in the decl-specifier-seq,
8050 issue an error message. */
8051 if (declspecs->multiple_types_p)
8053 error ("two or more data types in declaration of %qs", name);
8054 return error_mark_node;
8057 if (declspecs->conflicting_specifiers_p)
8059 error ("conflicting specifiers in declaration of %qs", name);
8060 return error_mark_node;
8063 /* Extract the basic type from the decl-specifier-seq. */
8064 type = declspecs->type;
8065 if (type == error_mark_node)
8068 type_was_error_mark_node = true;
8070 /* If the entire declaration is itself tagged as deprecated then
8071 suppress reports of deprecated items. */
8072 if (type && TREE_DEPRECATED (type)
8073 && deprecated_state != DEPRECATED_SUPPRESS)
8074 warn_deprecated_use (type, NULL_TREE);
8075 if (type && TREE_CODE (type) == TYPE_DECL)
8077 typedef_decl = type;
8078 type = TREE_TYPE (typedef_decl);
8079 if (TREE_DEPRECATED (type)
8080 && DECL_ARTIFICIAL (typedef_decl)
8081 && deprecated_state != DEPRECATED_SUPPRESS)
8082 warn_deprecated_use (type, NULL_TREE);
8084 /* No type at all: default to `int', and set DEFAULTED_INT
8085 because it was not a user-defined typedef. */
8086 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
8088 /* These imply 'int'. */
8089 type = integer_type_node;
8093 explicit_int = declspecs->explicit_int_p;
8094 explicit_char = declspecs->explicit_char_p;
8097 /* See the code below that used this. */
8099 decl_attr = DECL_ATTRIBUTES (typedef_decl);
8101 typedef_type = type;
8104 if (sfk != sfk_conversion)
8105 ctor_return_type = ctype;
8107 if (sfk != sfk_none)
8108 type = check_special_function_return_type (sfk, type,
8110 else if (type == NULL_TREE)
8116 /* We handle `main' specially here, because 'main () { }' is so
8117 common. With no options, it is allowed. With -Wreturn-type,
8118 it is a warning. It is only an error with -pedantic-errors. */
8119 is_main = (funcdef_flag
8120 && dname && TREE_CODE (dname) == IDENTIFIER_NODE
8121 && MAIN_NAME_P (dname)
8122 && ctype == NULL_TREE
8123 && in_namespace == NULL_TREE
8124 && current_namespace == global_namespace);
8126 if (type_was_error_mark_node)
8127 /* We've already issued an error, don't complain more. */;
8128 else if (in_system_header || flag_ms_extensions)
8129 /* Allow it, sigh. */;
8131 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8133 pedwarn (input_location, OPT_pedantic,
8134 "ISO C++ forbids declaration of %qs with no type", name);
8136 warning (OPT_Wreturn_type,
8137 "ISO C++ forbids declaration of %qs with no type", name);
8139 type = integer_type_node;
8144 /* Now process the modifiers that were specified
8145 and check for invalid combinations. */
8147 /* Long double is a special combination. */
8148 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8151 type = cp_build_qualified_type (long_double_type_node,
8152 cp_type_quals (type));
8155 /* Check all other uses of type modifiers. */
8157 if (unsigned_p || signed_p || long_p || short_p)
8161 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8162 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8163 else if (signed_p && unsigned_p)
8164 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8165 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8166 error ("%<long long%> invalid for %qs", name);
8167 else if (explicit_int128 && TREE_CODE (type) != INTEGER_TYPE)
8168 error ("%<__int128%> invalid for %qs", name);
8169 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8170 error ("%<long%> invalid for %qs", name);
8171 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8172 error ("%<short%> invalid for %qs", name);
8173 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8174 error ("%<long%> or %<short%> invalid for %qs", name);
8175 else if ((long_p || short_p || explicit_char || explicit_int) && explicit_int128)
8176 error ("%<long%>, %<int%>, %<short%>, or %<char%> invalid for %qs", name);
8177 else if ((long_p || short_p) && explicit_char)
8178 error ("%<long%> or %<short%> specified with char for %qs", name);
8179 else if (long_p && short_p)
8180 error ("%<long%> and %<short%> specified together for %qs", name);
8181 else if (type == char16_type_node || type == char32_type_node)
8183 if (signed_p || unsigned_p)
8184 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8185 else if (short_p || long_p)
8186 error ("%<short%> or %<long%> invalid for %qs", name);
8191 if (!explicit_int && !defaulted_int && !explicit_char && !explicit_int128 && pedantic)
8193 pedwarn (input_location, OPT_pedantic,
8194 "long, short, signed or unsigned used invalidly for %qs",
8196 if (flag_pedantic_errors)
8199 if (explicit_int128)
8201 if (int128_integer_type_node == NULL_TREE)
8203 error ("%<__int128%> is not supported by this target");
8208 pedwarn (input_location, OPT_pedantic,
8209 "ISO C++ does not support %<__int128%> for %qs",
8211 if (flag_pedantic_errors)
8217 /* Discard the type modifiers if they are invalid. */
8225 explicit_int128 = false;
8229 /* Decide whether an integer type is signed or not.
8230 Optionally treat bitfields as signed by default. */
8234 It is implementation-defined whether a plain (neither
8235 explicitly signed or unsigned) char, short, int, or long
8236 bit-field is signed or unsigned.
8238 Naturally, we extend this to long long as well. Note that
8239 this does not include wchar_t. */
8240 || (bitfield && !flag_signed_bitfields
8242 /* A typedef for plain `int' without `signed' can be
8243 controlled just like plain `int', but a typedef for
8244 `signed int' cannot be so controlled. */
8246 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8247 && TREE_CODE (type) == INTEGER_TYPE
8248 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8250 if (explicit_int128)
8251 type = int128_unsigned_type_node;
8253 type = long_long_unsigned_type_node;
8255 type = long_unsigned_type_node;
8257 type = short_unsigned_type_node;
8258 else if (type == char_type_node)
8259 type = unsigned_char_type_node;
8260 else if (typedef_decl)
8261 type = unsigned_type_for (type);
8263 type = unsigned_type_node;
8265 else if (signed_p && type == char_type_node)
8266 type = signed_char_type_node;
8267 else if (explicit_int128)
8268 type = int128_integer_type_node;
8270 type = long_long_integer_type_node;
8272 type = long_integer_type_node;
8274 type = short_integer_type_node;
8276 if (declspecs->specs[(int)ds_complex])
8278 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8279 error ("complex invalid for %qs", name);
8280 /* If we just have "complex", it is equivalent to
8281 "complex double", but if any modifiers at all are specified it is
8282 the complex form of TYPE. E.g, "complex short" is
8283 "complex short int". */
8284 else if (defaulted_int && ! longlong && ! explicit_int128
8285 && ! (long_p || short_p || signed_p || unsigned_p))
8286 type = complex_double_type_node;
8287 else if (type == integer_type_node)
8288 type = complex_integer_type_node;
8289 else if (type == float_type_node)
8290 type = complex_float_type_node;
8291 else if (type == double_type_node)
8292 type = complex_double_type_node;
8293 else if (type == long_double_type_node)
8294 type = complex_long_double_type_node;
8296 type = build_complex_type (type);
8299 type_quals = TYPE_UNQUALIFIED;
8300 if (declspecs->specs[(int)ds_const])
8301 type_quals |= TYPE_QUAL_CONST;
8302 /* A `constexpr' specifier used in an object declaration declares
8303 the object as `const'. */
8306 if (innermost_code == cdk_function)
8308 else if (declspecs->specs[(int)ds_const] != 0)
8309 error ("both %<const%> and %<constexpr%> cannot be used here");
8311 type_quals |= TYPE_QUAL_CONST;
8313 if (declspecs->specs[(int)ds_volatile])
8314 type_quals |= TYPE_QUAL_VOLATILE;
8315 if (declspecs->specs[(int)ds_restrict])
8316 type_quals |= TYPE_QUAL_RESTRICT;
8317 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8318 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8321 type_quals |= cp_type_quals (type);
8322 type = cp_build_qualified_type_real
8323 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8324 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8325 /* We might have ignored or rejected some of the qualifiers. */
8326 type_quals = cp_type_quals (type);
8329 inlinep = !! declspecs->specs[(int)ds_inline];
8330 virtualp = !! declspecs->specs[(int)ds_virtual];
8331 explicitp = !! declspecs->specs[(int)ds_explicit];
8333 storage_class = declspecs->storage_class;
8334 if (storage_class == sc_static)
8335 staticp = 1 + (decl_context == FIELD);
8337 if (virtualp && staticp == 2)
8339 error ("member %qD cannot be declared both virtual and static", dname);
8340 storage_class = sc_none;
8343 friendp = !! declspecs->specs[(int)ds_friend];
8345 if (dependent_name && !friendp)
8347 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8348 return error_mark_node;
8351 /* Issue errors about use of storage classes for parameters. */
8352 if (decl_context == PARM)
8354 if (declspecs->specs[(int)ds_typedef])
8356 error ("typedef declaration invalid in parameter declaration");
8357 return error_mark_node;
8359 else if (template_parm_flag && storage_class != sc_none)
8361 error ("storage class specified for template parameter %qs", name);
8362 return error_mark_node;
8364 else if (storage_class == sc_static
8365 || storage_class == sc_extern
8367 error ("storage class specifiers invalid in parameter declarations");
8369 if (type_uses_auto (type))
8371 error ("parameter declared %<auto%>");
8372 type = error_mark_node;
8375 /* Function parameters cannot be constexpr. If we saw one, moan
8376 and pretend it wasn't there. */
8379 error ("a parameter cannot be declared %<constexpr%>");
8384 /* Give error if `virtual' is used outside of class declaration. */
8386 && (current_class_name == NULL_TREE || decl_context != FIELD))
8388 error ("%<virtual%> outside class declaration");
8392 /* Static anonymous unions are dealt with here. */
8393 if (staticp && decl_context == TYPENAME
8395 && ANON_AGGR_TYPE_P (declspecs->type))
8396 decl_context = FIELD;
8398 /* Warn about storage classes that are invalid for certain
8399 kinds of declarations (parameters, typenames, etc.). */
8402 && storage_class != sc_extern
8403 && storage_class != sc_static)
8404 || declspecs->specs[(int)ds_typedef]))
8406 error ("multiple storage classes in declaration of %qs", name);
8409 if (decl_context != NORMAL
8410 && ((storage_class != sc_none
8411 && storage_class != sc_mutable)
8414 if ((decl_context == PARM || decl_context == CATCHPARM)
8415 && (storage_class == sc_register
8416 || storage_class == sc_auto))
8418 else if (declspecs->specs[(int)ds_typedef])
8420 else if (decl_context == FIELD
8421 /* C++ allows static class elements. */
8422 && storage_class == sc_static)
8423 /* C++ also allows inlines and signed and unsigned elements,
8424 but in those cases we don't come in here. */
8428 if (decl_context == FIELD)
8429 error ("storage class specified for %qs", name);
8432 if (decl_context == PARM || decl_context == CATCHPARM)
8433 error ("storage class specified for parameter %qs", name);
8435 error ("storage class specified for typename");
8437 if (storage_class == sc_register
8438 || storage_class == sc_auto
8439 || storage_class == sc_extern
8441 storage_class = sc_none;
8444 else if (storage_class == sc_extern && funcdef_flag
8445 && ! toplevel_bindings_p ())
8446 error ("nested function %qs declared %<extern%>", name);
8447 else if (toplevel_bindings_p ())
8449 if (storage_class == sc_auto)
8450 error ("top-level declaration of %qs specifies %<auto%>", name);
8453 && storage_class != sc_extern
8454 && storage_class != sc_static)
8456 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8461 if (storage_class && friendp)
8463 error ("storage class specifiers invalid in friend function declarations");
8464 storage_class = sc_none;
8469 unqualified_id = NULL_TREE;
8472 unqualified_id = id_declarator->u.id.unqualified_name;
8473 switch (TREE_CODE (unqualified_id))
8476 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8477 if (TYPE_P (unqualified_id))
8478 unqualified_id = constructor_name (unqualified_id);
8481 case IDENTIFIER_NODE:
8482 case TEMPLATE_ID_EXPR:
8490 /* Determine the type of the entity declared by recurring on the
8492 for (; declarator; declarator = declarator->declarator)
8494 const cp_declarator *inner_declarator;
8497 if (type == error_mark_node)
8498 return error_mark_node;
8500 attrs = declarator->attributes;
8506 if (declarator == NULL || declarator->kind == cdk_id)
8507 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8508 if (declarator->kind == cdk_function)
8509 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8510 if (declarator->kind == cdk_array)
8511 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8512 returned_attrs = decl_attributes (&type,
8513 chainon (returned_attrs, attrs),
8517 if (declarator->kind == cdk_id)
8520 inner_declarator = declarator->declarator;
8522 switch (declarator->kind)
8525 type = create_array_type_for_decl (dname, type,
8526 declarator->u.array.bounds);
8534 /* Declaring a function type.
8535 Make sure we have a valid type for the function to return. */
8537 if (type_quals != TYPE_UNQUALIFIED)
8539 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8540 warning (OPT_Wignored_qualifiers,
8541 "type qualifiers ignored on function return type");
8542 /* We now know that the TYPE_QUALS don't apply to the
8543 decl, but to its return type. */
8544 type_quals = TYPE_UNQUALIFIED;
8546 errmsg = targetm.invalid_return_type (type);
8550 type = integer_type_node;
8553 /* Error about some types functions can't return. */
8555 if (TREE_CODE (type) == FUNCTION_TYPE)
8557 error ("%qs declared as function returning a function", name);
8558 return error_mark_node;
8560 if (TREE_CODE (type) == ARRAY_TYPE)
8562 error ("%qs declared as function returning an array", name);
8563 return error_mark_node;
8566 /* Pick up type qualifiers which should be applied to `this'. */
8567 memfn_quals = declarator->u.function.qualifiers;
8569 /* Pick up the exception specifications. */
8570 raises = declarator->u.function.exception_specification;
8572 /* Say it's a definition only for the CALL_EXPR
8573 closest to the identifier. */
8574 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8576 /* Handle a late-specified return type. */
8579 if (type_uses_auto (type))
8581 if (!declarator->u.function.late_return_type)
8583 error ("%qs function uses %<auto%> type specifier without"
8584 " late return type", name);
8585 return error_mark_node;
8587 else if (!is_auto (type))
8589 error ("%qs function with late return type has"
8590 " %qT as its type rather than plain %<auto%>",
8592 return error_mark_node;
8595 else if (declarator->u.function.late_return_type)
8597 error ("%qs function with late return type not declared"
8598 " with %<auto%> type specifier", name);
8599 return error_mark_node;
8602 type = splice_late_return_type
8603 (type, declarator->u.function.late_return_type);
8604 if (type == error_mark_node)
8605 return error_mark_node;
8607 if (ctype == NULL_TREE
8608 && decl_context == FIELD
8610 && (friendp == 0 || dname == current_class_name))
8611 ctype = current_class_type;
8613 if (ctype && (sfk == sfk_constructor
8614 || sfk == sfk_destructor))
8616 /* We are within a class's scope. If our declarator name
8617 is the same as the class name, and we are defining
8618 a function, then it is a constructor/destructor, and
8619 therefore returns a void type. */
8621 /* ISO C++ 12.4/2. A destructor may not be declared
8622 const or volatile. A destructor may not be
8625 ISO C++ 12.1. A constructor may not be declared
8626 const or volatile. A constructor may not be
8627 virtual. A constructor may not be static. */
8629 error ((flags == DTOR_FLAG)
8630 ? "destructor cannot be static member function"
8631 : "constructor cannot be static member function");
8634 error ((flags == DTOR_FLAG)
8635 ? "destructors may not be cv-qualified"
8636 : "constructors may not be cv-qualified");
8637 memfn_quals = TYPE_UNQUALIFIED;
8640 if (decl_context == FIELD
8641 && !member_function_or_else (ctype,
8644 return error_mark_node;
8646 if (flags != DTOR_FLAG)
8648 /* It's a constructor. */
8653 permerror (input_location, "constructors cannot be declared virtual");
8656 if (decl_context == FIELD
8657 && sfk != sfk_constructor)
8658 return error_mark_node;
8660 if (decl_context == FIELD)
8666 error ("can't initialize friend function %qs", name);
8669 /* Cannot be both friend and virtual. */
8670 error ("virtual functions cannot be friends");
8673 if (decl_context == NORMAL)
8674 error ("friend declaration not in class definition");
8675 if (current_function_decl && funcdef_flag)
8676 error ("can't define friend function %qs in a local "
8680 else if (ctype && sfk == sfk_conversion)
8684 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8689 /* It is not allowed to use `constexpr' in a function
8690 declaration that is not a definition.
8691 That is too strict, though. */
8692 if (constexpr_p && !funcdef_flag)
8694 error ("the %<constexpr%> specifier cannot be used in "
8695 "a function declaration that is not a definition");
8696 constexpr_p = false;
8699 /* A constexpr non-static member function is implicitly const. */
8700 if (constexpr_p && decl_context == FIELD && staticp == 0
8701 && sfk != sfk_constructor && sfk != sfk_destructor)
8702 memfn_quals |= TYPE_QUAL_CONST;
8704 arg_types = grokparms (declarator->u.function.parameters,
8707 if (inner_declarator
8708 && inner_declarator->kind == cdk_id
8709 && inner_declarator->u.id.sfk == sfk_destructor
8710 && arg_types != void_list_node)
8712 error ("destructors may not have parameters");
8713 arg_types = void_list_node;
8717 type = build_function_type (type, arg_types);
8724 /* Filter out pointers-to-references and references-to-references.
8725 We can get these if a TYPE_DECL is used. */
8727 if (TREE_CODE (type) == REFERENCE_TYPE)
8729 if (declarator->kind != cdk_reference)
8731 error ("cannot declare pointer to %q#T", type);
8732 type = TREE_TYPE (type);
8735 /* In C++0x, we allow reference to reference declarations
8736 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8737 and template type arguments [14.3.1/4 temp.arg.type]. The
8738 check for direct reference to reference declarations, which
8739 are still forbidden, occurs below. Reasoning behind the change
8740 can be found in DR106, DR540, and the rvalue reference
8742 else if (cxx_dialect == cxx98)
8744 error ("cannot declare reference to %q#T", type);
8745 type = TREE_TYPE (type);
8748 else if (VOID_TYPE_P (type))
8750 if (declarator->kind == cdk_reference)
8751 error ("cannot declare reference to %q#T", type);
8752 else if (declarator->kind == cdk_ptrmem)
8753 error ("cannot declare pointer to %q#T member", type);
8756 /* We now know that the TYPE_QUALS don't apply to the decl,
8757 but to the target of the pointer. */
8758 type_quals = TYPE_UNQUALIFIED;
8760 if (declarator->kind == cdk_ptrmem
8761 && (TREE_CODE (type) == FUNCTION_TYPE
8762 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8764 memfn_quals |= type_memfn_quals (type);
8765 type = build_memfn_type (type,
8766 declarator->u.pointer.class_type,
8768 if (type == error_mark_node)
8769 return error_mark_node;
8770 memfn_quals = TYPE_UNQUALIFIED;
8773 if (TREE_CODE (type) == FUNCTION_TYPE
8774 && type_memfn_quals (type) != TYPE_UNQUALIFIED)
8775 error (declarator->kind == cdk_reference
8776 ? G_("cannot declare reference to qualified function type %qT")
8777 : G_("cannot declare pointer to qualified function type %qT"),
8780 /* When the pointed-to type involves components of variable size,
8781 care must be taken to ensure that the size evaluation code is
8782 emitted early enough to dominate all the possible later uses
8783 and late enough for the variables on which it depends to have
8786 This is expected to happen automatically when the pointed-to
8787 type has a name/declaration of it's own, but special attention
8788 is required if the type is anonymous.
8790 We handle the NORMAL and FIELD contexts here by inserting a
8791 dummy statement that just evaluates the size at a safe point
8792 and ensures it is not deferred until e.g. within a deeper
8793 conditional context (c++/43555).
8795 We expect nothing to be needed here for PARM or TYPENAME.
8796 Evaluating the size at this point for TYPENAME would
8797 actually be incorrect, as we might be in the middle of an
8798 expression with side effects on the pointed-to type size
8799 "arguments" prior to the pointer declaration point and the
8800 size evaluation could end up prior to the side effects. */
8802 if (!TYPE_NAME (type)
8803 && (decl_context == NORMAL || decl_context == FIELD)
8804 && at_function_scope_p ()
8805 && variably_modified_type_p (type, NULL_TREE))
8806 finish_expr_stmt (TYPE_SIZE (type));
8808 if (declarator->kind == cdk_reference)
8810 /* In C++0x, the type we are creating a reference to might be
8811 a typedef which is itself a reference type. In that case,
8812 we follow the reference collapsing rules in
8813 [7.1.3/8 dcl.typedef] to create the final reference type:
8815 "If a typedef TD names a type that is a reference to a type
8816 T, an attempt to create the type 'lvalue reference to cv TD'
8817 creates the type 'lvalue reference to T,' while an attempt
8818 to create the type "rvalue reference to cv TD' creates the
8821 if (!VOID_TYPE_P (type))
8822 type = cp_build_reference_type
8823 ((TREE_CODE (type) == REFERENCE_TYPE
8824 ? TREE_TYPE (type) : type),
8825 (declarator->u.reference.rvalue_ref
8826 && (TREE_CODE(type) != REFERENCE_TYPE
8827 || TYPE_REF_IS_RVALUE (type))));
8829 /* In C++0x, we need this check for direct reference to
8830 reference declarations, which are forbidden by
8831 [8.3.2/5 dcl.ref]. Reference to reference declarations
8832 are only allowed indirectly through typedefs and template
8833 type arguments. Example:
8835 void foo(int & &); // invalid ref-to-ref decl
8837 typedef int & int_ref;
8838 void foo(int_ref &); // valid ref-to-ref decl
8840 if (inner_declarator && inner_declarator->kind == cdk_reference)
8841 error ("cannot declare reference to %q#T, which is not "
8842 "a typedef or a template type argument", type);
8844 else if (TREE_CODE (type) == METHOD_TYPE)
8845 type = build_ptrmemfunc_type (build_pointer_type (type));
8846 else if (declarator->kind == cdk_ptrmem)
8848 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8850 if (declarator->u.pointer.class_type == error_mark_node)
8851 /* We will already have complained. */
8852 type = error_mark_node;
8854 type = build_ptrmem_type (declarator->u.pointer.class_type,
8858 type = build_pointer_type (type);
8860 /* Process a list of type modifier keywords (such as
8861 const or volatile) that were given inside the `*' or `&'. */
8863 if (declarator->u.pointer.qualifiers)
8866 = cp_build_qualified_type (type,
8867 declarator->u.pointer.qualifiers);
8868 type_quals = cp_type_quals (type);
8881 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8882 && TREE_CODE (type) != FUNCTION_TYPE
8883 && TREE_CODE (type) != METHOD_TYPE)
8885 error ("template-id %qD used as a declarator",
8887 unqualified_id = dname;
8890 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8891 qualified with a class-name, turn it into a METHOD_TYPE, unless
8892 we know that the function is static. We take advantage of this
8893 opportunity to do other processing that pertains to entities
8894 explicitly declared to be class members. Note that if DECLARATOR
8895 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8896 would not have exited the loop above. */
8898 && declarator->u.id.qualifying_scope
8899 && TYPE_P (declarator->u.id.qualifying_scope))
8903 ctype = declarator->u.id.qualifying_scope;
8904 ctype = TYPE_MAIN_VARIANT (ctype);
8906 while (t != NULL_TREE && CLASS_TYPE_P (t))
8908 /* You're supposed to have one `template <...>' for every
8909 template class, but you don't need one for a full
8910 specialization. For example:
8912 template <class T> struct S{};
8913 template <> struct S<int> { void f(); };
8914 void S<int>::f () {}
8916 is correct; there shouldn't be a `template <>' for the
8917 definition of `S<int>::f'. */
8918 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8919 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8920 /* T is an explicit (not partial) specialization. All
8921 containing classes must therefore also be explicitly
8924 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8925 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8926 template_count += 1;
8928 t = TYPE_MAIN_DECL (t);
8929 t = DECL_CONTEXT (t);
8932 if (ctype == current_class_type)
8936 permerror (input_location, "member functions are implicitly friends of their class");
8940 permerror (declarator->id_loc,
8941 "extra qualification %<%T::%> on member %qs",
8944 else if (/* If the qualifying type is already complete, then we
8945 can skip the following checks. */
8946 !COMPLETE_TYPE_P (ctype)
8947 && (/* If the function is being defined, then
8948 qualifying type must certainly be complete. */
8950 /* A friend declaration of "T::f" is OK, even if
8951 "T" is a template parameter. But, if this
8952 function is not a friend, the qualifying type
8954 || (!friendp && !CLASS_TYPE_P (ctype))
8955 /* For a declaration, the type need not be
8956 complete, if either it is dependent (since there
8957 is no meaningful definition of complete in that
8958 case) or the qualifying class is currently being
8960 || !(dependent_type_p (ctype)
8961 || currently_open_class (ctype)))
8962 /* Check that the qualifying type is complete. */
8963 && !complete_type_or_else (ctype, NULL_TREE))
8964 return error_mark_node;
8965 else if (TREE_CODE (type) == FUNCTION_TYPE)
8967 tree sname = declarator->u.id.unqualified_name;
8969 if (current_class_type
8970 && (!friendp || funcdef_flag))
8973 ? "cannot define member function %<%T::%s%> within %<%T%>"
8974 : "cannot declare member function %<%T::%s%> within %<%T%>",
8975 ctype, name, current_class_type);
8976 return error_mark_node;
8979 /* It is not permitted to define a member function outside ist
8980 membership class as `constexpr'. */
8982 error ("a constexpr function cannot be defined "
8983 "outside of its class");
8985 if (TREE_CODE (sname) == IDENTIFIER_NODE
8986 && NEW_DELETE_OPNAME_P (sname))
8987 /* Overloaded operator new and operator delete
8988 are always static functions. */
8991 type = build_memfn_type (type, ctype, memfn_quals);
8993 else if (declspecs->specs[(int)ds_typedef]
8994 && current_class_type)
8996 error ("cannot declare member %<%T::%s%> within %qT",
8997 ctype, name, current_class_type);
8998 return error_mark_node;
9002 /* Now TYPE has the actual type. */
9007 *attrlist = chainon (returned_attrs, *attrlist);
9009 attrlist = &returned_attrs;
9012 /* Handle parameter packs. */
9013 if (parameter_pack_p)
9015 if (decl_context == PARM)
9016 /* Turn the type into a pack expansion.*/
9017 type = make_pack_expansion (type);
9019 error ("non-parameter %qs cannot be a parameter pack", name);
9022 /* Did array size calculations overflow? */
9024 if (TREE_CODE (type) == ARRAY_TYPE
9025 && COMPLETE_TYPE_P (type)
9026 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
9027 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
9029 error ("size of array %qs is too large", name);
9030 /* If we proceed with the array type as it is, we'll eventually
9031 crash in tree_low_cst(). */
9032 type = error_mark_node;
9035 if ((decl_context == FIELD || decl_context == PARM)
9036 && !processing_template_decl
9037 && variably_modified_type_p (type, NULL_TREE))
9039 if (decl_context == FIELD)
9040 error ("data member may not have variably modified type %qT", type);
9042 error ("parameter may not have variably modified type %qT", type);
9043 type = error_mark_node;
9046 if (explicitp == 1 || (explicitp && friendp))
9048 /* [dcl.fct.spec] The explicit specifier shall only be used in
9049 declarations of constructors within a class definition. */
9050 error ("only declarations of constructors can be %<explicit%>");
9054 if (storage_class == sc_mutable)
9056 if (decl_context != FIELD || friendp)
9058 error ("non-member %qs cannot be declared %<mutable%>", name);
9059 storage_class = sc_none;
9061 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
9063 error ("non-object member %qs cannot be declared %<mutable%>", name);
9064 storage_class = sc_none;
9066 else if (TREE_CODE (type) == FUNCTION_TYPE
9067 || TREE_CODE (type) == METHOD_TYPE)
9069 error ("function %qs cannot be declared %<mutable%>", name);
9070 storage_class = sc_none;
9074 error ("static %qs cannot be declared %<mutable%>", name);
9075 storage_class = sc_none;
9077 else if (type_quals & TYPE_QUAL_CONST)
9079 error ("const %qs cannot be declared %<mutable%>", name);
9080 storage_class = sc_none;
9084 /* If this is declaring a typedef name, return a TYPE_DECL. */
9085 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
9089 /* Note that the grammar rejects storage classes
9090 in typenames, fields or parameters. */
9091 if (current_lang_name == lang_name_java)
9092 TYPE_FOR_JAVA (type) = 1;
9094 /* This declaration:
9096 typedef void f(int) const;
9098 declares a function type which is not a member of any
9099 particular class, but which is cv-qualified; for
9100 example "f S::*" declares a pointer to a const-qualified
9101 member function of S. We record the cv-qualification in the
9103 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
9105 type = apply_memfn_quals (type, memfn_quals);
9107 /* We have now dealt with these qualifiers. */
9108 memfn_quals = TYPE_UNQUALIFIED;
9111 if (decl_context == FIELD)
9112 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
9114 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
9115 if (id_declarator && declarator->u.id.qualifying_scope) {
9116 error_at (DECL_SOURCE_LOCATION (decl),
9117 "typedef name may not be a nested-name-specifier");
9118 TREE_TYPE (decl) = error_mark_node;
9121 if (decl_context != FIELD)
9123 if (!current_function_decl)
9124 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
9125 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
9126 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
9127 (current_function_decl)))
9128 /* The TYPE_DECL is "abstract" because there will be
9129 clones of this constructor/destructor, and there will
9130 be copies of this TYPE_DECL generated in those
9132 DECL_ABSTRACT (decl) = 1;
9134 else if (constructor_name_p (unqualified_id, current_class_type))
9135 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
9136 "as enclosing class",
9139 /* If the user declares "typedef struct {...} foo" then the
9140 struct will have an anonymous name. Fill that name in now.
9141 Nothing can refer to it, so nothing needs know about the name
9143 if (type != error_mark_node
9146 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
9147 && TYPE_ANONYMOUS_P (type)
9148 && cp_type_quals (type) == TYPE_UNQUALIFIED)
9152 /* Replace the anonymous name with the real name everywhere. */
9153 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
9155 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
9156 /* We do not rename the debug info representing the
9157 anonymous tagged type because the standard says in
9158 [dcl.typedef] that the naming applies only for
9159 linkage purposes. */
9160 /*debug_hooks->set_name (t, decl);*/
9161 TYPE_NAME (t) = decl;
9164 if (TYPE_LANG_SPECIFIC (type))
9165 TYPE_WAS_ANONYMOUS (type) = 1;
9167 /* If this is a typedef within a template class, the nested
9168 type is a (non-primary) template. The name for the
9169 template needs updating as well. */
9170 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9171 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9172 = TYPE_IDENTIFIER (type);
9174 /* Adjust linkage now that we aren't anonymous anymore. */
9175 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9176 determine_visibility (TYPE_MAIN_DECL (type));
9178 /* FIXME remangle member functions; member functions of a
9179 type with external linkage have external linkage. */
9183 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9184 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9186 bad_specifiers (decl, BSP_TYPE, virtualp,
9187 memfn_quals != TYPE_UNQUALIFIED,
9188 inlinep, friendp, raises != NULL_TREE);
9193 /* Detect the case of an array type of unspecified size
9194 which came, as such, direct from a typedef name.
9195 We must copy the type, so that the array's domain can be
9196 individually set by the object's initializer. */
9198 if (type && typedef_type
9199 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9200 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9201 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9203 /* Detect where we're using a typedef of function type to declare a
9204 function. PARMS will not be set, so we must create it now. */
9206 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9208 tree decls = NULL_TREE;
9211 for (args = TYPE_ARG_TYPES (type);
9212 args && args != void_list_node;
9213 args = TREE_CHAIN (args))
9215 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9217 DECL_CHAIN (decl) = decls;
9221 parms = nreverse (decls);
9223 if (decl_context != TYPENAME)
9225 /* A cv-qualifier-seq shall only be part of the function type
9226 for a non-static member function. [8.3.5/4 dcl.fct] */
9227 if (type_memfn_quals (type) != TYPE_UNQUALIFIED
9228 && (current_class_type == NULL_TREE || staticp) )
9231 ? G_("qualified function types cannot be used to "
9232 "declare static member functions")
9233 : G_("qualified function types cannot be used to "
9234 "declare free functions"));
9235 type = TYPE_MAIN_VARIANT (type);
9238 /* The qualifiers on the function type become the qualifiers on
9239 the non-static member function. */
9240 memfn_quals |= type_memfn_quals (type);
9241 type_quals = TYPE_UNQUALIFIED;
9245 /* If this is a type name (such as, in a cast or sizeof),
9246 compute the type and return it now. */
9248 if (decl_context == TYPENAME)
9250 /* Note that the grammar rejects storage classes
9251 in typenames, fields or parameters. */
9252 if (type_quals != TYPE_UNQUALIFIED)
9253 type_quals = TYPE_UNQUALIFIED;
9255 /* Special case: "friend class foo" looks like a TYPENAME context. */
9258 if (type_quals != TYPE_UNQUALIFIED)
9260 error ("type qualifiers specified for friend class declaration");
9261 type_quals = TYPE_UNQUALIFIED;
9265 error ("%<inline%> specified for friend class declaration");
9271 /* Don't allow friend declaration without a class-key. */
9272 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9273 permerror (input_location, "template parameters cannot be friends");
9274 else if (TREE_CODE (type) == TYPENAME_TYPE)
9275 permerror (input_location, "friend declaration requires class-key, "
9276 "i.e. %<friend class %T::%D%>",
9277 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9279 permerror (input_location, "friend declaration requires class-key, "
9280 "i.e. %<friend %#T%>",
9284 /* Only try to do this stuff if we didn't already give up. */
9285 if (type != integer_type_node)
9287 /* A friendly class? */
9288 if (current_class_type)
9289 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9292 error ("trying to make class %qT a friend of global scope",
9295 type = void_type_node;
9298 else if (memfn_quals)
9300 if (ctype == NULL_TREE
9301 && TREE_CODE (type) == METHOD_TYPE)
9302 ctype = TYPE_METHOD_BASETYPE (type);
9305 type = build_memfn_type (type, ctype, memfn_quals);
9306 /* Core issue #547: need to allow this in template type args. */
9307 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9308 type = apply_memfn_quals (type, memfn_quals);
9310 error ("invalid qualifiers on non-member function type");
9315 else if (unqualified_id == NULL_TREE && decl_context != PARM
9316 && decl_context != CATCHPARM
9317 && TREE_CODE (type) != UNION_TYPE
9320 error ("abstract declarator %qT used as declaration", type);
9321 return error_mark_node;
9324 /* Only functions may be declared using an operator-function-id. */
9326 && IDENTIFIER_OPNAME_P (unqualified_id)
9327 && TREE_CODE (type) != FUNCTION_TYPE
9328 && TREE_CODE (type) != METHOD_TYPE)
9330 error ("declaration of %qD as non-function", unqualified_id);
9331 return error_mark_node;
9334 /* We don't check parameter types here because we can emit a better
9335 error message later. */
9336 if (decl_context != PARM)
9338 type = check_var_type (unqualified_id, type);
9339 if (type == error_mark_node)
9340 return error_mark_node;
9343 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9344 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9346 if (decl_context == PARM || decl_context == CATCHPARM)
9348 if (ctype || in_namespace)
9349 error ("cannot use %<::%> in parameter declaration");
9351 /* A parameter declared as an array of T is really a pointer to T.
9352 One declared as a function is really a pointer to a function.
9353 One declared as a member is really a pointer to member. */
9355 if (TREE_CODE (type) == ARRAY_TYPE)
9357 /* Transfer const-ness of array into that of type pointed to. */
9358 type = build_pointer_type (TREE_TYPE (type));
9359 type_quals = TYPE_UNQUALIFIED;
9361 else if (TREE_CODE (type) == FUNCTION_TYPE)
9362 type = build_pointer_type (type);
9368 if (decl_context == PARM)
9370 decl = cp_build_parm_decl (unqualified_id, type);
9372 bad_specifiers (decl, BSP_PARM, virtualp,
9373 memfn_quals != TYPE_UNQUALIFIED,
9374 inlinep, friendp, raises != NULL_TREE);
9376 else if (decl_context == FIELD)
9378 /* The C99 flexible array extension. */
9379 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9380 && TYPE_DOMAIN (type) == NULL_TREE)
9382 tree itype = compute_array_index_type (dname, integer_zero_node);
9383 type = build_cplus_array_type (TREE_TYPE (type), itype);
9386 if (type == error_mark_node)
9388 /* Happens when declaring arrays of sizes which
9389 are error_mark_node, for example. */
9392 else if (in_namespace && !friendp)
9394 /* Something like struct S { int N::j; }; */
9395 error ("invalid use of %<::%>");
9396 return error_mark_node;
9398 else if (TREE_CODE (type) == FUNCTION_TYPE)
9401 tree function_context;
9405 if (ctype == NULL_TREE)
9406 ctype = current_class_type;
9408 if (ctype == NULL_TREE)
9410 error ("can't make %qD into a method -- not in a class",
9412 return error_mark_node;
9415 /* ``A union may [ ... ] not [ have ] virtual functions.''
9417 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9419 error ("function %qD declared virtual inside a union",
9421 return error_mark_node;
9424 if (NEW_DELETE_OPNAME_P (unqualified_id))
9428 error ("%qD cannot be declared virtual, since it "
9434 else if (staticp < 2)
9435 type = build_memfn_type (type, ctype, memfn_quals);
9438 /* Check that the name used for a destructor makes sense. */
9439 if (sfk == sfk_destructor)
9441 tree uqname = id_declarator->u.id.unqualified_name;
9445 gcc_assert (friendp);
9446 error ("expected qualified name in friend declaration "
9447 "for destructor %qD", uqname);
9448 return error_mark_node;
9451 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9453 error ("declaration of %qD as member of %qT",
9455 return error_mark_node;
9458 error ("a destructor cannot be %<constexpr%>");
9460 else if (sfk == sfk_constructor && friendp)
9462 error ("expected qualified name in friend declaration "
9463 "for constructor %qD",
9464 id_declarator->u.id.unqualified_name);
9465 return error_mark_node;
9468 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9469 function_context = (ctype != NULL_TREE) ?
9470 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9471 publicp = (! friendp || ! staticp)
9472 && function_context == NULL_TREE;
9473 decl = grokfndecl (ctype, type,
9474 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9475 ? unqualified_id : dname,
9478 virtualp, flags, memfn_quals, raises,
9479 friendp ? -1 : 0, friendp, publicp,
9480 inlinep || constexpr_p,
9482 funcdef_flag, template_count, in_namespace,
9483 attrlist, declarator->id_loc);
9484 if (decl == NULL_TREE)
9485 return error_mark_node;
9487 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9488 /* The decl and setting of decl_attr is also turned off. */
9489 decl = build_decl_attribute_variant (decl, decl_attr);
9492 /* [class.conv.ctor]
9494 A constructor declared without the function-specifier
9495 explicit that can be called with a single parameter
9496 specifies a conversion from the type of its first
9497 parameter to the type of its class. Such a constructor
9498 is called a converting constructor. */
9500 DECL_NONCONVERTING_P (decl) = 1;
9502 else if (TREE_CODE (type) == METHOD_TYPE)
9504 /* We only get here for friend declarations of
9505 members of other classes. */
9506 /* All method decls are public, so tell grokfndecl to set
9507 TREE_PUBLIC, also. */
9508 decl = grokfndecl (ctype, type,
9509 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9510 ? unqualified_id : dname,
9513 virtualp, flags, memfn_quals, raises,
9514 friendp ? -1 : 0, friendp, 1, 0, sfk,
9515 funcdef_flag, template_count, in_namespace,
9517 declarator->id_loc);
9518 if (decl == NULL_TREE)
9519 return error_mark_node;
9521 else if (!staticp && !dependent_type_p (type)
9522 && !COMPLETE_TYPE_P (complete_type (type))
9523 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9526 error ("field %qD has incomplete type", unqualified_id);
9528 error ("name %qT has incomplete type", type);
9530 /* If we're instantiating a template, tell them which
9531 instantiation made the field's type be incomplete. */
9532 if (current_class_type
9533 && TYPE_NAME (current_class_type)
9534 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9536 && declspecs->type == type)
9537 error (" in instantiation of template %qT",
9538 current_class_type);
9540 return error_mark_node;
9546 error ("%qE is neither function nor member function; "
9547 "cannot be declared friend", unqualified_id);
9555 /* Friends are treated specially. */
9556 if (ctype == current_class_type)
9557 ; /* We already issued a permerror. */
9558 else if (decl && DECL_NAME (decl))
9560 if (template_class_depth (current_class_type) == 0)
9562 decl = check_explicit_specialization
9563 (unqualified_id, decl, template_count,
9564 2 * funcdef_flag + 4);
9565 if (decl == error_mark_node)
9566 return error_mark_node;
9569 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9570 decl = do_friend (ctype, unqualified_id, decl,
9576 return error_mark_node;
9579 /* Structure field. It may not be a function, except for C++. */
9581 if (decl == NULL_TREE)
9587 /* An attempt is being made to initialize a non-static
9588 member. But, from [class.mem]:
9590 4 A member-declarator can contain a
9591 constant-initializer only if it declares a static
9592 member (_class.static_) of integral or enumeration
9593 type, see _class.static.data_.
9595 This used to be relatively common practice, but
9596 the rest of the compiler does not correctly
9597 handle the initialization unless the member is
9598 static so we make it static below. */
9599 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9601 permerror (input_location, "making %qD static", unqualified_id);
9605 if (uses_template_parms (type))
9606 /* We'll check at instantiation time. */
9608 else if (check_static_variable_definition (unqualified_id,
9610 /* If we just return the declaration, crashes
9611 will sometimes occur. We therefore return
9612 void_type_node, as if this was a friend
9613 declaration, to cause callers to completely
9614 ignore this declaration. */
9615 return error_mark_node;
9620 /* C++ allows static class members. All other work
9621 for this is done by grokfield. */
9622 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9623 set_linkage_for_static_data_member (decl);
9624 /* Even if there is an in-class initialization, DECL
9625 is considered undefined until an out-of-class
9626 definition is provided. */
9627 DECL_EXTERNAL (decl) = 1;
9630 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9635 error ("non-static data member %qE declared %<constexpr%>",
9637 decl = build_decl (input_location,
9638 FIELD_DECL, unqualified_id, type);
9639 DECL_NONADDRESSABLE_P (decl) = bitfield;
9640 if (bitfield && !unqualified_id)
9641 TREE_NO_WARNING (decl) = 1;
9643 if (storage_class == sc_mutable)
9645 DECL_MUTABLE_P (decl) = 1;
9646 storage_class = sc_none;
9650 bad_specifiers (decl, BSP_FIELD, virtualp,
9651 memfn_quals != TYPE_UNQUALIFIED,
9652 inlinep, friendp, raises != NULL_TREE);
9655 else if (TREE_CODE (type) == FUNCTION_TYPE
9656 || TREE_CODE (type) == METHOD_TYPE)
9661 if (!unqualified_id)
9662 return error_mark_node;
9664 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9665 original_name = dname;
9667 original_name = unqualified_id;
9669 if (storage_class == sc_auto)
9670 error ("storage class %<auto%> invalid for function %qs", name);
9671 else if (storage_class == sc_register)
9672 error ("storage class %<register%> invalid for function %qs", name);
9674 error ("storage class %<__thread%> invalid for function %qs", name);
9676 /* Function declaration not at top level.
9677 Storage classes other than `extern' are not allowed
9678 and `extern' makes no difference. */
9679 if (! toplevel_bindings_p ()
9680 && (storage_class == sc_static
9681 || declspecs->specs[(int)ds_inline])
9684 if (storage_class == sc_static)
9685 pedwarn (input_location, OPT_pedantic,
9686 "%<static%> specified invalid for function %qs "
9687 "declared out of global scope", name);
9689 pedwarn (input_location, OPT_pedantic,
9690 "%<inline%> specifier invalid for function %qs "
9691 "declared out of global scope", name);
9694 if (ctype != NULL_TREE
9695 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9697 error ("%q#T is not a class or a namespace", ctype);
9701 if (ctype == NULL_TREE)
9705 error ("virtual non-class function %qs", name);
9708 else if (sfk == sfk_constructor
9709 || sfk == sfk_destructor)
9712 ? "%qs defined in a non-class scope"
9713 : "%qs declared in a non-class scope", name);
9717 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9718 && !NEW_DELETE_OPNAME_P (original_name))
9719 type = build_method_type_directly (ctype,
9721 TYPE_ARG_TYPES (type));
9723 /* Record presence of `static'. */
9724 publicp = (ctype != NULL_TREE
9725 || storage_class == sc_extern
9726 || storage_class != sc_static);
9728 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9729 virtualp, flags, memfn_quals, raises,
9731 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9732 template_count, in_namespace, attrlist,
9733 declarator->id_loc);
9734 if (decl == NULL_TREE)
9735 return error_mark_node;
9739 int invalid_static = 0;
9741 /* Don't allow a static member function in a class, and forbid
9742 declaring main to be static. */
9743 if (TREE_CODE (type) == METHOD_TYPE)
9745 permerror (input_location, "cannot declare member function %qD to have "
9746 "static linkage", decl);
9749 else if (current_function_decl)
9751 /* FIXME need arm citation */
9752 error ("cannot declare static function inside another function");
9759 storage_class = sc_none;
9765 /* It's a variable. */
9767 /* An uninitialized decl with `extern' is a reference. */
9768 decl = grokvardecl (type, unqualified_id,
9771 (type_quals & TYPE_QUAL_CONST) != 0,
9772 ctype ? ctype : in_namespace);
9773 bad_specifiers (decl, BSP_VAR, virtualp,
9774 memfn_quals != TYPE_UNQUALIFIED,
9775 inlinep, friendp, raises != NULL_TREE);
9779 DECL_CONTEXT (decl) = ctype;
9782 permerror (input_location, "%<static%> may not be used when defining "
9783 "(as opposed to declaring) a static data member");
9785 storage_class = sc_none;
9787 if (storage_class == sc_register && TREE_STATIC (decl))
9789 error ("static member %qD declared %<register%>", decl);
9790 storage_class = sc_none;
9792 if (storage_class == sc_extern && pedantic)
9794 pedwarn (input_location, OPT_pedantic,
9795 "cannot explicitly declare member %q#D to have "
9796 "extern linkage", decl);
9797 storage_class = sc_none;
9802 if (storage_class == sc_extern && initialized && !funcdef_flag)
9804 if (toplevel_bindings_p ())
9806 /* It's common practice (and completely valid) to have a const
9807 be initialized and declared extern. */
9808 if (!(type_quals & TYPE_QUAL_CONST))
9809 warning (0, "%qs initialized and declared %<extern%>", name);
9813 error ("%qs has both %<extern%> and initializer", name);
9814 return error_mark_node;
9818 /* Record `register' declaration for warnings on &
9819 and in case doing stupid register allocation. */
9821 if (storage_class == sc_register)
9822 DECL_REGISTER (decl) = 1;
9823 else if (storage_class == sc_extern)
9824 DECL_THIS_EXTERN (decl) = 1;
9825 else if (storage_class == sc_static)
9826 DECL_THIS_STATIC (decl) = 1;
9828 /* Don't forget constexprness. */
9829 if (VAR_OR_FUNCTION_DECL_P (decl))
9830 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9832 /* Record constancy and volatility on the DECL itself . There's
9833 no need to do this when processing a template; we'll do this
9834 for the instantiated declaration based on the type of DECL. */
9835 if (!processing_template_decl)
9836 cp_apply_type_quals_to_decl (type_quals, decl);
9842 /* Subroutine of start_function. Ensure that each of the parameter
9843 types (as listed in PARMS) is complete, as is required for a
9844 function definition. */
9847 require_complete_types_for_parms (tree parms)
9849 for (; parms; parms = DECL_CHAIN (parms))
9851 if (dependent_type_p (TREE_TYPE (parms)))
9853 if (!VOID_TYPE_P (TREE_TYPE (parms))
9854 && complete_type_or_else (TREE_TYPE (parms), parms))
9856 relayout_decl (parms);
9857 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9860 /* grokparms or complete_type_or_else will have already issued
9862 TREE_TYPE (parms) = error_mark_node;
9866 /* Returns nonzero if T is a local variable. */
9869 local_variable_p (const_tree t)
9871 if ((TREE_CODE (t) == VAR_DECL
9872 /* A VAR_DECL with a context that is a _TYPE is a static data
9874 && !TYPE_P (CP_DECL_CONTEXT (t))
9875 /* Any other non-local variable must be at namespace scope. */
9876 && !DECL_NAMESPACE_SCOPE_P (t))
9877 || (TREE_CODE (t) == PARM_DECL))
9883 /* Like local_variable_p, but suitable for use as a tree-walking
9887 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9888 void *data ATTRIBUTE_UNUSED)
9890 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9892 else if (TYPE_P (*tp))
9899 /* Check that ARG, which is a default-argument expression for a
9900 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9901 something goes wrong. DECL may also be a _TYPE node, rather than a
9902 DECL, if there is no DECL available. */
9905 check_default_argument (tree decl, tree arg)
9910 if (TREE_CODE (arg) == DEFAULT_ARG)
9911 /* We get a DEFAULT_ARG when looking at an in-class declaration
9912 with a default argument. Ignore the argument for now; we'll
9913 deal with it after the class is complete. */
9922 decl_type = TREE_TYPE (decl);
9924 if (arg == error_mark_node
9925 || decl == error_mark_node
9926 || TREE_TYPE (arg) == error_mark_node
9927 || decl_type == error_mark_node)
9928 /* Something already went wrong. There's no need to check
9930 return error_mark_node;
9932 /* [dcl.fct.default]
9934 A default argument expression is implicitly converted to the
9936 if (!TREE_TYPE (arg)
9937 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9940 error ("default argument for %q#D has type %qT",
9941 decl, TREE_TYPE (arg));
9943 error ("default argument for parameter of type %qT has type %qT",
9944 decl_type, TREE_TYPE (arg));
9946 return error_mark_node;
9949 /* [dcl.fct.default]
9951 Local variables shall not be used in default argument
9954 The keyword `this' shall not be used in a default argument of a
9956 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9959 error ("default argument %qE uses local variable %qD", arg, var);
9960 return error_mark_node;
9967 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9970 type_is_deprecated (tree type)
9972 enum tree_code code;
9973 if (TREE_DEPRECATED (type))
9975 if (TYPE_NAME (type)
9976 && TREE_DEPRECATED (TYPE_NAME (type)))
9979 /* Do warn about using typedefs to a deprecated class. */
9980 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
9981 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
9983 code = TREE_CODE (type);
9985 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9986 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9987 || code == METHOD_TYPE || code == ARRAY_TYPE)
9988 return type_is_deprecated (TREE_TYPE (type));
9990 if (TYPE_PTRMEMFUNC_P (type))
9991 return type_is_deprecated
9992 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9997 /* Decode the list of parameter types for a function type.
9998 Given the list of things declared inside the parens,
9999 return a list of types.
10001 If this parameter does not end with an ellipsis, we append
10004 *PARMS is set to the chain of PARM_DECLs created. */
10007 grokparms (tree parmlist, tree *parms)
10009 tree result = NULL_TREE;
10010 tree decls = NULL_TREE;
10014 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
10016 tree type = NULL_TREE;
10017 tree init = TREE_PURPOSE (parm);
10018 tree decl = TREE_VALUE (parm);
10019 const char *errmsg;
10021 if (parm == void_list_node)
10024 if (! decl || TREE_TYPE (decl) == error_mark_node)
10027 type = TREE_TYPE (decl);
10028 if (VOID_TYPE_P (type))
10030 if (same_type_p (type, void_type_node)
10031 && DECL_SELF_REFERENCE_P (type)
10032 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
10033 /* this is a parmlist of `(void)', which is ok. */
10035 cxx_incomplete_type_error (decl, type);
10036 /* It's not a good idea to actually create parameters of
10037 type `void'; other parts of the compiler assume that a
10038 void type terminates the parameter list. */
10039 type = error_mark_node;
10040 TREE_TYPE (decl) = error_mark_node;
10043 if (type != error_mark_node
10044 && TYPE_FOR_JAVA (type)
10045 && MAYBE_CLASS_TYPE_P (type))
10047 error ("parameter %qD has Java class type", decl);
10048 type = error_mark_node;
10049 TREE_TYPE (decl) = error_mark_node;
10053 if (type != error_mark_node
10054 && (errmsg = targetm.invalid_parameter_type (type)))
10057 type = error_mark_node;
10058 TREE_TYPE (decl) = error_mark_node;
10061 if (type != error_mark_node)
10063 if (deprecated_state != DEPRECATED_SUPPRESS)
10065 tree deptype = type_is_deprecated (type);
10067 warn_deprecated_use (deptype, NULL_TREE);
10070 /* Top-level qualifiers on the parameters are
10071 ignored for function types. */
10072 type = cp_build_qualified_type (type, 0);
10073 if (TREE_CODE (type) == METHOD_TYPE)
10075 error ("parameter %qD invalidly declared method type", decl);
10076 type = build_pointer_type (type);
10077 TREE_TYPE (decl) = type;
10079 else if (abstract_virtuals_error (decl, type))
10080 any_error = 1; /* Seems like a good idea. */
10081 else if (POINTER_TYPE_P (type))
10083 /* [dcl.fct]/6, parameter types cannot contain pointers
10084 (references) to arrays of unknown bound. */
10085 tree t = TREE_TYPE (type);
10086 int ptr = TYPE_PTR_P (type);
10090 if (TYPE_PTR_P (t))
10092 else if (TREE_CODE (t) != ARRAY_TYPE)
10094 else if (!TYPE_DOMAIN (t))
10098 if (TREE_CODE (t) == ARRAY_TYPE)
10100 ? G_("parameter %qD includes pointer to array of "
10101 "unknown bound %qT")
10102 : G_("parameter %qD includes reference to array of "
10103 "unknown bound %qT"),
10109 else if (init && !processing_template_decl)
10110 init = check_default_argument (decl, init);
10113 if (TREE_CODE (decl) == PARM_DECL
10114 && FUNCTION_PARAMETER_PACK_P (decl)
10115 && TREE_CHAIN (parm)
10116 && TREE_CHAIN (parm) != void_list_node)
10117 error ("parameter packs must be at the end of the parameter list");
10119 DECL_CHAIN (decl) = decls;
10121 result = tree_cons (init, type, result);
10123 decls = nreverse (decls);
10124 result = nreverse (result);
10126 result = chainon (result, void_list_node);
10133 /* D is a constructor or overloaded `operator='.
10135 Let T be the class in which D is declared. Then, this function
10138 -1 if D's is an ill-formed constructor or copy assignment operator
10139 whose first parameter is of type `T'.
10140 0 if D is not a copy constructor or copy assignment
10142 1 if D is a copy constructor or copy assignment operator whose
10143 first parameter is a reference to non-const qualified T.
10144 2 if D is a copy constructor or copy assignment operator whose
10145 first parameter is a reference to const qualified T.
10147 This function can be used as a predicate. Positive values indicate
10148 a copy constructor and nonzero values indicate a copy assignment
10152 copy_fn_p (const_tree d)
10158 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10160 if (TREE_CODE (d) == TEMPLATE_DECL
10161 || (DECL_TEMPLATE_INFO (d)
10162 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10163 /* Instantiations of template member functions are never copy
10164 functions. Note that member functions of templated classes are
10165 represented as template functions internally, and we must
10166 accept those as copy functions. */
10169 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10173 arg_type = TREE_VALUE (args);
10174 if (arg_type == error_mark_node)
10177 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10179 /* Pass by value copy assignment operator. */
10182 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10183 && !TYPE_REF_IS_RVALUE (arg_type)
10184 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10186 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10192 args = TREE_CHAIN (args);
10194 if (args && args != void_list_node && !TREE_PURPOSE (args))
10195 /* There are more non-optional args. */
10201 /* D is a constructor or overloaded `operator='.
10203 Let T be the class in which D is declared. Then, this function
10204 returns true when D is a move constructor or move assignment
10205 operator, false otherwise. */
10208 move_fn_p (const_tree d)
10212 bool result = false;
10214 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10216 if (cxx_dialect == cxx98)
10217 /* There are no move constructors if we are in C++98 mode. */
10220 if (TREE_CODE (d) == TEMPLATE_DECL
10221 || (DECL_TEMPLATE_INFO (d)
10222 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10223 /* Instantiations of template member functions are never copy
10224 functions. Note that member functions of templated classes are
10225 represented as template functions internally, and we must
10226 accept those as copy functions. */
10229 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10233 arg_type = TREE_VALUE (args);
10234 if (arg_type == error_mark_node)
10237 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10238 && TYPE_REF_IS_RVALUE (arg_type)
10239 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10243 args = TREE_CHAIN (args);
10245 if (args && args != void_list_node && !TREE_PURPOSE (args))
10246 /* There are more non-optional args. */
10252 /* Remember any special properties of member function DECL. */
10255 grok_special_member_properties (tree decl)
10259 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10262 class_type = DECL_CONTEXT (decl);
10263 if (DECL_CONSTRUCTOR_P (decl))
10265 int ctor = copy_fn_p (decl);
10267 if (!DECL_ARTIFICIAL (decl))
10268 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10274 A non-template constructor for class X is a copy
10275 constructor if its first parameter is of type X&, const
10276 X&, volatile X& or const volatile X&, and either there
10277 are no other parameters or else all other parameters have
10278 default arguments. */
10279 TYPE_HAS_COPY_CTOR (class_type) = 1;
10280 if (user_provided_p (decl))
10281 TYPE_HAS_COMPLEX_COPY_CTOR (class_type) = 1;
10283 TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
10285 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10287 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10288 if (user_provided_p (decl))
10289 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10291 else if (move_fn_p (decl) && user_provided_p (decl))
10292 TYPE_HAS_COMPLEX_MOVE_CTOR (class_type) = 1;
10293 else if (is_list_ctor (decl))
10294 TYPE_HAS_LIST_CTOR (class_type) = 1;
10296 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10300 A non-template assignment operator for class X is a copy
10301 assignment operator if its parameter is of type X, X&, const
10302 X&, volatile X& or const volatile X&. */
10304 int assop = copy_fn_p (decl);
10308 TYPE_HAS_COPY_ASSIGN (class_type) = 1;
10309 if (user_provided_p (decl))
10310 TYPE_HAS_COMPLEX_COPY_ASSIGN (class_type) = 1;
10312 TYPE_HAS_CONST_COPY_ASSIGN (class_type) = 1;
10314 else if (move_fn_p (decl) && user_provided_p (decl))
10315 TYPE_HAS_COMPLEX_MOVE_ASSIGN (class_type) = 1;
10317 /* Destructors are handled in check_methods. */
10320 /* Check a constructor DECL has the correct form. Complains
10321 if the class has a constructor of the form X(X). */
10324 grok_ctor_properties (const_tree ctype, const_tree decl)
10326 int ctor_parm = copy_fn_p (decl);
10332 A declaration of a constructor for a class X is ill-formed if
10333 its first parameter is of type (optionally cv-qualified) X
10334 and either there are no other parameters or else all other
10335 parameters have default arguments.
10337 We *don't* complain about member template instantiations that
10338 have this form, though; they can occur as we try to decide
10339 what constructor to use during overload resolution. Since
10340 overload resolution will never prefer such a constructor to
10341 the non-template copy constructor (which is either explicitly
10342 or implicitly defined), there's no need to worry about their
10343 existence. Theoretically, they should never even be
10344 instantiated, but that's hard to forestall. */
10345 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10353 /* An operator with this code is unary, but can also be binary. */
10356 ambi_op_p (enum tree_code code)
10358 return (code == INDIRECT_REF
10359 || code == ADDR_EXPR
10360 || code == UNARY_PLUS_EXPR
10361 || code == NEGATE_EXPR
10362 || code == PREINCREMENT_EXPR
10363 || code == PREDECREMENT_EXPR);
10366 /* An operator with this name can only be unary. */
10369 unary_op_p (enum tree_code code)
10371 return (code == TRUTH_NOT_EXPR
10372 || code == BIT_NOT_EXPR
10373 || code == COMPONENT_REF
10374 || code == TYPE_EXPR);
10377 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10378 errors are issued for invalid declarations. */
10381 grok_op_properties (tree decl, bool complain)
10383 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10385 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10386 tree name = DECL_NAME (decl);
10387 enum tree_code operator_code;
10392 /* Count the number of arguments and check for ellipsis. */
10393 for (argtype = argtypes, arity = 0;
10394 argtype && argtype != void_list_node;
10395 argtype = TREE_CHAIN (argtype))
10397 ellipsis_p = !argtype;
10399 class_type = DECL_CONTEXT (decl);
10400 if (class_type && !CLASS_TYPE_P (class_type))
10401 class_type = NULL_TREE;
10403 if (DECL_CONV_FN_P (decl))
10404 operator_code = TYPE_EXPR;
10408 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10409 if (ansi_opname (CODE) == name) \
10411 operator_code = (CODE); \
10414 else if (ansi_assopname (CODE) == name) \
10416 operator_code = (CODE); \
10417 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10421 #include "operators.def"
10422 #undef DEF_OPERATOR
10424 gcc_unreachable ();
10427 gcc_assert (operator_code != MAX_TREE_CODES);
10428 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10431 switch (operator_code)
10434 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10438 TYPE_GETS_DELETE (class_type) |= 1;
10442 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10445 case VEC_DELETE_EXPR:
10446 TYPE_GETS_DELETE (class_type) |= 2;
10453 /* [basic.std.dynamic.allocation]/1:
10455 A program is ill-formed if an allocation function is declared
10456 in a namespace scope other than global scope or declared static
10459 The same also holds true for deallocation functions. */
10460 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10461 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10463 if (DECL_NAMESPACE_SCOPE_P (decl))
10465 if (CP_DECL_CONTEXT (decl) != global_namespace)
10467 error ("%qD may not be declared within a namespace", decl);
10470 else if (!TREE_PUBLIC (decl))
10472 error ("%qD may not be declared as static", decl);
10478 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10480 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10481 DECL_IS_OPERATOR_NEW (decl) = 1;
10483 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10484 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10487 /* An operator function must either be a non-static member function
10488 or have at least one parameter of a class, a reference to a class,
10489 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10490 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10492 if (operator_code == TYPE_EXPR
10493 || operator_code == CALL_EXPR
10494 || operator_code == COMPONENT_REF
10495 || operator_code == ARRAY_REF
10496 || operator_code == NOP_EXPR)
10498 error ("%qD must be a nonstatic member function", decl);
10505 if (DECL_STATIC_FUNCTION_P (decl))
10507 error ("%qD must be either a non-static member "
10508 "function or a non-member function", decl);
10512 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10514 tree arg = non_reference (TREE_VALUE (p));
10515 if (arg == error_mark_node)
10518 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10519 because these checks are performed even on
10520 template functions. */
10521 if (MAYBE_CLASS_TYPE_P (arg)
10522 || TREE_CODE (arg) == ENUMERAL_TYPE)
10526 if (!p || p == void_list_node)
10529 error ("%qD must have an argument of class or "
10530 "enumerated type", decl);
10536 /* There are no restrictions on the arguments to an overloaded
10538 if (operator_code == CALL_EXPR)
10541 /* Warn about conversion operators that will never be used. */
10542 if (IDENTIFIER_TYPENAME_P (name)
10543 && ! DECL_TEMPLATE_INFO (decl)
10545 /* Warn only declaring the function; there is no need to
10546 warn again about out-of-class definitions. */
10547 && class_type == current_class_type)
10549 tree t = TREE_TYPE (name);
10550 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10553 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10555 if (TREE_CODE (t) == VOID_TYPE)
10556 warning (OPT_Wconversion,
10558 ? G_("conversion to a reference to void "
10559 "will never use a type conversion operator")
10560 : G_("conversion to void "
10561 "will never use a type conversion operator"));
10562 else if (class_type)
10564 if (t == class_type)
10565 warning (OPT_Wconversion,
10567 ? G_("conversion to a reference to the same type "
10568 "will never use a type conversion operator")
10569 : G_("conversion to the same type "
10570 "will never use a type conversion operator"));
10571 /* Don't force t to be complete here. */
10572 else if (MAYBE_CLASS_TYPE_P (t)
10573 && COMPLETE_TYPE_P (t)
10574 && DERIVED_FROM_P (t, class_type))
10575 warning (OPT_Wconversion,
10577 ? G_("conversion to a reference to a base class "
10578 "will never use a type conversion operator")
10579 : G_("conversion to a base class "
10580 "will never use a type conversion operator"));
10585 if (operator_code == COND_EXPR)
10588 error ("ISO C++ prohibits overloading operator ?:");
10591 else if (ellipsis_p)
10593 error ("%qD must not have variable number of arguments", decl);
10596 else if (ambi_op_p (operator_code))
10599 /* We pick the one-argument operator codes by default, so
10600 we don't have to change anything. */
10602 else if (arity == 2)
10604 /* If we thought this was a unary operator, we now know
10605 it to be a binary operator. */
10606 switch (operator_code)
10609 operator_code = MULT_EXPR;
10613 operator_code = BIT_AND_EXPR;
10616 case UNARY_PLUS_EXPR:
10617 operator_code = PLUS_EXPR;
10621 operator_code = MINUS_EXPR;
10624 case PREINCREMENT_EXPR:
10625 operator_code = POSTINCREMENT_EXPR;
10628 case PREDECREMENT_EXPR:
10629 operator_code = POSTDECREMENT_EXPR;
10633 gcc_unreachable ();
10636 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10638 if ((operator_code == POSTINCREMENT_EXPR
10639 || operator_code == POSTDECREMENT_EXPR)
10640 && ! processing_template_decl
10641 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10644 error ("postfix %qD must take %<int%> as its argument",
10647 error ("postfix %qD must take %<int%> as its second "
10655 error ("%qD must take either zero or one argument", decl);
10657 error ("%qD must take either one or two arguments", decl);
10661 /* More Effective C++ rule 6. */
10663 && (operator_code == POSTINCREMENT_EXPR
10664 || operator_code == POSTDECREMENT_EXPR
10665 || operator_code == PREINCREMENT_EXPR
10666 || operator_code == PREDECREMENT_EXPR))
10668 tree arg = TREE_VALUE (argtypes);
10669 tree ret = TREE_TYPE (TREE_TYPE (decl));
10670 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10671 arg = TREE_TYPE (arg);
10672 arg = TYPE_MAIN_VARIANT (arg);
10673 if (operator_code == PREINCREMENT_EXPR
10674 || operator_code == PREDECREMENT_EXPR)
10676 if (TREE_CODE (ret) != REFERENCE_TYPE
10677 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10679 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10680 build_reference_type (arg));
10684 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10685 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10689 else if (unary_op_p (operator_code))
10694 error ("%qD must take %<void%>", decl);
10696 error ("%qD must take exactly one argument", decl);
10700 else /* if (binary_op_p (operator_code)) */
10705 error ("%qD must take exactly one argument", decl);
10707 error ("%qD must take exactly two arguments", decl);
10711 /* More Effective C++ rule 7. */
10713 && (operator_code == TRUTH_ANDIF_EXPR
10714 || operator_code == TRUTH_ORIF_EXPR
10715 || operator_code == COMPOUND_EXPR))
10716 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10720 /* Effective C++ rule 23. */
10723 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10724 && (operator_code == PLUS_EXPR
10725 || operator_code == MINUS_EXPR
10726 || operator_code == TRUNC_DIV_EXPR
10727 || operator_code == MULT_EXPR
10728 || operator_code == TRUNC_MOD_EXPR)
10729 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10730 warning (OPT_Weffc__, "%qD should return by value", decl);
10732 /* [over.oper]/8 */
10733 for (; argtypes && argtypes != void_list_node;
10734 argtypes = TREE_CHAIN (argtypes))
10735 if (TREE_PURPOSE (argtypes))
10737 TREE_PURPOSE (argtypes) = NULL_TREE;
10738 if (operator_code == POSTINCREMENT_EXPR
10739 || operator_code == POSTDECREMENT_EXPR)
10741 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10746 error ("%qD cannot have default arguments", decl);
10754 /* Return a string giving the keyword associate with CODE. */
10756 static const char *
10757 tag_name (enum tag_types code)
10769 case typename_type:
10772 gcc_unreachable ();
10776 /* Name lookup in an elaborated-type-specifier (after the keyword
10777 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10778 elaborated-type-specifier is invalid, issue a diagnostic and return
10779 error_mark_node; otherwise, return the *_TYPE to which it referred.
10780 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10783 check_elaborated_type_specifier (enum tag_types tag_code,
10785 bool allow_template_p)
10791 struct S { struct S *p; };
10793 name lookup will find the TYPE_DECL for the implicit "S::S"
10794 typedef. Adjust for that here. */
10795 if (DECL_SELF_REFERENCE_P (decl))
10796 decl = TYPE_NAME (TREE_TYPE (decl));
10798 type = TREE_TYPE (decl);
10800 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10801 is false for this case as well. */
10802 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10804 error ("using template type parameter %qT after %qs",
10805 type, tag_name (tag_code));
10806 return error_mark_node;
10810 If the identifier resolves to a typedef-name or a template
10811 type-parameter, the elaborated-type-specifier is ill-formed.
10813 In other words, the only legitimate declaration to use in the
10814 elaborated type specifier is the implicit typedef created when
10815 the type is declared. */
10816 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10817 && !DECL_SELF_REFERENCE_P (decl)
10818 && tag_code != typename_type)
10820 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10821 error ("%q+D has a previous declaration here", decl);
10822 return error_mark_node;
10824 else if (TREE_CODE (type) != RECORD_TYPE
10825 && TREE_CODE (type) != UNION_TYPE
10826 && tag_code != enum_type
10827 && tag_code != typename_type)
10829 error ("%qT referred to as %qs", type, tag_name (tag_code));
10830 error ("%q+T has a previous declaration here", type);
10831 return error_mark_node;
10833 else if (TREE_CODE (type) != ENUMERAL_TYPE
10834 && tag_code == enum_type)
10836 error ("%qT referred to as enum", type);
10837 error ("%q+T has a previous declaration here", type);
10838 return error_mark_node;
10840 else if (!allow_template_p
10841 && TREE_CODE (type) == RECORD_TYPE
10842 && CLASSTYPE_IS_TEMPLATE (type))
10844 /* If a class template appears as elaborated type specifier
10845 without a template header such as:
10847 template <class T> class C {};
10848 void f(class C); // No template header here
10850 then the required template argument is missing. */
10851 error ("template argument required for %<%s %T%>",
10852 tag_name (tag_code),
10853 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10854 return error_mark_node;
10860 /* Lookup NAME in elaborate type specifier in scope according to
10861 SCOPE and issue diagnostics if necessary.
10862 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10863 found, and ERROR_MARK_NODE for type error. */
10866 lookup_and_check_tag (enum tag_types tag_code, tree name,
10867 tag_scope scope, bool template_header_p)
10871 if (scope == ts_global)
10873 /* First try ordinary name lookup, ignoring hidden class name
10874 injected via friend declaration. */
10875 decl = lookup_name_prefer_type (name, 2);
10876 /* If that fails, the name will be placed in the smallest
10877 non-class, non-function-prototype scope according to 3.3.1/5.
10878 We may already have a hidden name declared as friend in this
10879 scope. So lookup again but not ignoring hidden names.
10880 If we find one, that name will be made visible rather than
10881 creating a new tag. */
10883 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10886 decl = lookup_type_scope (name, scope);
10888 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10889 decl = DECL_TEMPLATE_RESULT (decl);
10891 if (decl && TREE_CODE (decl) == TYPE_DECL)
10893 /* Look for invalid nested type:
10897 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10899 error ("%qD has the same name as the class in which it is "
10902 return error_mark_node;
10905 /* Two cases we need to consider when deciding if a class
10906 template is allowed as an elaborated type specifier:
10907 1. It is a self reference to its own class.
10908 2. It comes with a template header.
10912 template <class T> class C {
10913 class C *c1; // DECL_SELF_REFERENCE_P is true
10916 template <class U> class C; // template_header_p is true
10917 template <class T> class C<T>::D {
10918 class C *c2; // DECL_SELF_REFERENCE_P is true
10921 t = check_elaborated_type_specifier (tag_code,
10924 | DECL_SELF_REFERENCE_P (decl));
10927 else if (decl && TREE_CODE (decl) == TREE_LIST)
10929 error ("reference to %qD is ambiguous", name);
10930 print_candidates (decl);
10931 return error_mark_node;
10937 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10938 Define the tag as a forward-reference if it is not defined.
10940 If a declaration is given, process it here, and report an error if
10941 multiple declarations are not identical.
10943 SCOPE is TS_CURRENT when this is also a definition. Only look in
10944 the current frame for the name (since C++ allows new names in any
10945 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10946 declaration. Only look beginning from the current scope outward up
10947 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10949 TEMPLATE_HEADER_P is true when this declaration is preceded by
10950 a set of template parameters. */
10953 xref_tag (enum tag_types tag_code, tree name,
10954 tag_scope scope, bool template_header_p)
10956 enum tree_code code;
10958 tree context = NULL_TREE;
10960 timevar_push (TV_NAME_LOOKUP);
10962 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10968 code = RECORD_TYPE;
10974 code = ENUMERAL_TYPE;
10977 gcc_unreachable ();
10980 /* In case of anonymous name, xref_tag is only called to
10981 make type node and push name. Name lookup is not required. */
10982 if (ANON_AGGRNAME_P (name))
10985 t = lookup_and_check_tag (tag_code, name,
10986 scope, template_header_p);
10988 if (t == error_mark_node)
10989 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10991 if (scope != ts_current && t && current_class_type
10992 && template_class_depth (current_class_type)
10993 && template_header_p)
10995 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10996 definition of this tag. Since, in addition, we are currently
10997 processing a (member) template declaration of a template
10998 class, we must be very careful; consider:
11005 { template <class V>
11006 friend struct S1; };
11008 Here, the S2::S1 declaration should not be confused with the
11009 outer declaration. In particular, the inner version should
11010 have a template parameter of level 2, not level 1. This
11011 would be particularly important if the member declaration
11014 template <class V = U> friend struct S1;
11016 say, when we should tsubst into `U' when instantiating
11017 S2. On the other hand, when presented with:
11027 we must find the inner binding eventually. We
11028 accomplish this by making sure that the new type we
11029 create to represent this declaration has the right
11031 context = TYPE_CONTEXT (t);
11037 /* If no such tag is yet defined, create a forward-reference node
11038 and record it as the "definition".
11039 When a real declaration of this type is found,
11040 the forward-reference will be altered into a real type. */
11041 if (code == ENUMERAL_TYPE)
11043 error ("use of enum %q#D without previous declaration", name);
11044 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11048 t = make_class_type (code);
11049 TYPE_CONTEXT (t) = context;
11050 t = pushtag (name, t, scope);
11055 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
11057 if (!redeclare_class_template (t, current_template_parms))
11058 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11060 else if (!processing_template_decl
11061 && CLASS_TYPE_P (t)
11062 && CLASSTYPE_IS_TEMPLATE (t))
11064 error ("redeclaration of %qT as a non-template", t);
11065 error ("previous declaration %q+D", t);
11066 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
11069 /* Make injected friend class visible. */
11070 if (scope != ts_within_enclosing_non_class
11071 && hidden_name_p (TYPE_NAME (t)))
11073 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
11074 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
11076 if (TYPE_TEMPLATE_INFO (t))
11078 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
11079 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
11084 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
11088 xref_tag_from_type (tree old, tree id, tag_scope scope)
11090 enum tag_types tag_kind;
11092 if (TREE_CODE (old) == RECORD_TYPE)
11093 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
11095 tag_kind = union_type;
11097 if (id == NULL_TREE)
11098 id = TYPE_IDENTIFIER (old);
11100 return xref_tag (tag_kind, id, scope, false);
11103 /* Create the binfo hierarchy for REF with (possibly NULL) base list
11104 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
11105 access_* node, and the TREE_VALUE is the type of the base-class.
11106 Non-NULL TREE_TYPE indicates virtual inheritance.
11108 Returns true if the binfo hierarchy was successfully created,
11109 false if an error was detected. */
11112 xref_basetypes (tree ref, tree base_list)
11115 tree binfo, base_binfo;
11116 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
11117 unsigned max_bases = 0; /* Maximum direct bases. */
11119 tree default_access;
11120 tree igo_prev; /* Track Inheritance Graph Order. */
11122 if (ref == error_mark_node)
11125 /* The base of a derived class is private by default, all others are
11127 default_access = (TREE_CODE (ref) == RECORD_TYPE
11128 && CLASSTYPE_DECLARED_CLASS (ref)
11129 ? access_private_node : access_public_node);
11131 /* First, make sure that any templates in base-classes are
11132 instantiated. This ensures that if we call ourselves recursively
11133 we do not get confused about which classes are marked and which
11135 basep = &base_list;
11138 tree basetype = TREE_VALUE (*basep);
11140 if (!(processing_template_decl && uses_template_parms (basetype))
11141 && !complete_type_or_else (basetype, NULL))
11142 /* An incomplete type. Remove it from the list. */
11143 *basep = TREE_CHAIN (*basep);
11147 if (TREE_TYPE (*basep))
11149 if (CLASS_TYPE_P (basetype))
11150 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
11151 basep = &TREE_CHAIN (*basep);
11155 TYPE_MARKED_P (ref) = 1;
11157 /* The binfo slot should be empty, unless this is an (ill-formed)
11159 if (TYPE_BINFO (ref) && !TYPE_SIZE (ref))
11161 error ("redefinition of %q#T", ref);
11165 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
11167 binfo = make_tree_binfo (max_bases);
11169 TYPE_BINFO (ref) = binfo;
11170 BINFO_OFFSET (binfo) = size_zero_node;
11171 BINFO_TYPE (binfo) = ref;
11173 /* Apply base-class info set up to the variants of this type. */
11174 fixup_type_variants (ref);
11178 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11179 /* An aggregate cannot have baseclasses. */
11180 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11182 if (TREE_CODE (ref) == UNION_TYPE)
11184 error ("derived union %qT invalid", ref);
11191 if (TYPE_FOR_JAVA (ref))
11193 error ("Java class %qT cannot have multiple bases", ref);
11200 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11202 if (TYPE_FOR_JAVA (ref))
11204 error ("Java class %qT cannot have virtual bases", ref);
11209 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11211 tree access = TREE_PURPOSE (base_list);
11212 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11213 tree basetype = TREE_VALUE (base_list);
11215 if (access == access_default_node)
11216 access = default_access;
11218 if (PACK_EXPANSION_P (basetype))
11219 basetype = PACK_EXPANSION_PATTERN (basetype);
11220 if (TREE_CODE (basetype) == TYPE_DECL)
11221 basetype = TREE_TYPE (basetype);
11222 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11224 error ("base type %qT fails to be a struct or class type",
11229 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11230 TYPE_FOR_JAVA (ref) = 1;
11232 base_binfo = NULL_TREE;
11233 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11235 base_binfo = TYPE_BINFO (basetype);
11236 /* The original basetype could have been a typedef'd type. */
11237 basetype = BINFO_TYPE (base_binfo);
11239 /* Inherit flags from the base. */
11240 TYPE_HAS_NEW_OPERATOR (ref)
11241 |= TYPE_HAS_NEW_OPERATOR (basetype);
11242 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11243 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11244 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11245 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11246 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11247 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11248 CLASSTYPE_REPEATED_BASE_P (ref)
11249 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11252 /* We must do this test after we've seen through a typedef
11254 if (TYPE_MARKED_P (basetype))
11256 if (basetype == ref)
11257 error ("recursive type %qT undefined", basetype);
11259 error ("duplicate base type %qT invalid", basetype);
11263 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11264 /* Regenerate the pack expansion for the bases. */
11265 basetype = make_pack_expansion (basetype);
11267 TYPE_MARKED_P (basetype) = 1;
11269 base_binfo = copy_binfo (base_binfo, basetype, ref,
11270 &igo_prev, via_virtual);
11271 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11272 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11274 BINFO_BASE_APPEND (binfo, base_binfo);
11275 BINFO_BASE_ACCESS_APPEND (binfo, access);
11278 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11279 /* If we have space in the vbase vector, we must have shared at
11280 least one of them, and are therefore diamond shaped. */
11281 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11283 /* Unmark all the types. */
11284 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11285 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11286 TYPE_MARKED_P (ref) = 0;
11288 /* Now see if we have a repeated base type. */
11289 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11291 for (base_binfo = binfo; base_binfo;
11292 base_binfo = TREE_CHAIN (base_binfo))
11294 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11296 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11299 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11301 for (base_binfo = binfo; base_binfo;
11302 base_binfo = TREE_CHAIN (base_binfo))
11303 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11304 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11313 /* Copies the enum-related properties from type SRC to type DST.
11314 Used with the underlying type of an enum and the enum itself. */
11316 copy_type_enum (tree dst, tree src)
11318 TYPE_MIN_VALUE (dst) = TYPE_MIN_VALUE (src);
11319 TYPE_MAX_VALUE (dst) = TYPE_MAX_VALUE (src);
11320 TYPE_SIZE (dst) = TYPE_SIZE (src);
11321 TYPE_SIZE_UNIT (dst) = TYPE_SIZE_UNIT (src);
11322 SET_TYPE_MODE (dst, TYPE_MODE (src));
11323 TYPE_PRECISION (dst) = TYPE_PRECISION (src);
11324 TYPE_ALIGN (dst) = TYPE_ALIGN (src);
11325 TYPE_USER_ALIGN (dst) = TYPE_USER_ALIGN (src);
11326 TYPE_UNSIGNED (dst) = TYPE_UNSIGNED (src);
11329 /* Begin compiling the definition of an enumeration type.
11332 if ENUMTYPE is not NULL_TREE then the type has alredy been found.
11334 UNDERLYING_TYPE is the type that will be used as the storage for
11335 the enumeration type. This should be NULL_TREE if no storage type
11338 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11340 if IS_NEW is not NULL, gets TRUE iff a new type is created.
11342 Returns the type object, as yet incomplete.
11343 Also records info about it so that build_enumerator
11344 may be used to declare the individual values as they are read. */
11347 start_enum (tree name, tree enumtype, tree underlying_type,
11348 bool scoped_enum_p, bool *is_new)
11350 tree prevtype = NULL_TREE;
11351 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11355 /* [C++0x dcl.enum]p5:
11357 If not explicitly specified, the underlying type of a scoped
11358 enumeration type is int. */
11359 if (!underlying_type && scoped_enum_p)
11360 underlying_type = integer_type_node;
11362 if (underlying_type)
11363 underlying_type = cv_unqualified (underlying_type);
11365 /* If this is the real definition for a previous forward reference,
11366 fill in the contents in the same object that used to be the
11367 forward reference. */
11369 enumtype = lookup_and_check_tag (enum_type, name,
11370 /*tag_scope=*/ts_current,
11371 /*template_header_p=*/false);
11373 /* In case of a template_decl, the only check that should be deferred
11374 to instantiation time is the comparison of underlying types. */
11375 if (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11377 if (scoped_enum_p != SCOPED_ENUM_P (enumtype))
11379 error_at (input_location, "scoped/unscoped mismatch "
11380 "in enum %q#T", enumtype);
11381 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11382 "previous definition here");
11383 enumtype = error_mark_node;
11385 else if (ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) != !! underlying_type)
11387 error_at (input_location, "underlying type mismatch "
11388 "in enum %q#T", enumtype);
11389 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11390 "previous definition here");
11391 enumtype = error_mark_node;
11393 else if (underlying_type && ENUM_UNDERLYING_TYPE (enumtype)
11394 && !dependent_type_p (underlying_type)
11395 && !dependent_type_p (ENUM_UNDERLYING_TYPE (enumtype))
11396 && !same_type_p (underlying_type,
11397 ENUM_UNDERLYING_TYPE (enumtype)))
11399 error_at (input_location, "different underlying type "
11400 "in enum %q#T", enumtype);
11401 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11402 "previous definition here");
11403 underlying_type = NULL_TREE;
11407 if (!enumtype || TREE_CODE (enumtype) != ENUMERAL_TYPE
11408 || processing_template_decl)
11410 /* In case of error, make a dummy enum to allow parsing to
11412 if (enumtype == error_mark_node)
11414 name = make_anon_name ();
11415 enumtype = NULL_TREE;
11418 /* enumtype may be an ENUMERAL_TYPE if this is a redefinition
11419 of an opaque enum, or an opaque enum of an already defined
11420 enumeration (C++0x only).
11421 In any other case, it'll be NULL_TREE. */
11427 prevtype = enumtype;
11428 enumtype = cxx_make_type (ENUMERAL_TYPE);
11429 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11430 if (enumtype == error_mark_node)
11431 return error_mark_node;
11433 /* The enum is considered opaque until the opening '{' of the
11434 enumerator list. */
11435 SET_OPAQUE_ENUM_P (enumtype, true);
11436 ENUM_FIXED_UNDERLYING_TYPE_P (enumtype) = !! underlying_type;
11439 SET_SCOPED_ENUM_P (enumtype, scoped_enum_p);
11441 if (underlying_type)
11443 if (CP_INTEGRAL_TYPE_P (underlying_type))
11445 copy_type_enum (enumtype, underlying_type);
11446 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11448 else if (dependent_type_p (underlying_type))
11449 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11451 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11452 underlying_type, enumtype);
11455 /* If into a template class, the returned enum is always the first
11456 declaration (opaque or not) seen. This way all the references to
11457 this type will be to the same declaration. The following ones are used
11458 only to check for definition errors. */
11459 if (prevtype && processing_template_decl)
11465 /* After processing and defining all the values of an enumeration type,
11466 install their decls in the enumeration type.
11467 ENUMTYPE is the type object. */
11470 finish_enum_value_list (tree enumtype)
11473 tree underlying_type;
11476 tree minnode, maxnode;
11479 bool fixed_underlying_type_p
11480 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11482 /* We built up the VALUES in reverse order. */
11483 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11485 /* For an enum defined in a template, just set the type of the values;
11486 all further processing is postponed until the template is
11487 instantiated. We need to set the type so that tsubst of a CONST_DECL
11489 if (processing_template_decl)
11491 for (values = TYPE_VALUES (enumtype);
11493 values = TREE_CHAIN (values))
11494 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11498 /* Determine the minimum and maximum values of the enumerators. */
11499 if (TYPE_VALUES (enumtype))
11501 minnode = maxnode = NULL_TREE;
11503 for (values = TYPE_VALUES (enumtype);
11505 values = TREE_CHAIN (values))
11507 decl = TREE_VALUE (values);
11509 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11510 each enumerator has the type of its enumeration. Prior to the
11511 closing brace, the type of each enumerator is the type of its
11512 initializing value. */
11513 TREE_TYPE (decl) = enumtype;
11515 /* Update the minimum and maximum values, if appropriate. */
11516 value = DECL_INITIAL (decl);
11517 if (value == error_mark_node)
11518 value = integer_zero_node;
11519 /* Figure out what the minimum and maximum values of the
11520 enumerators are. */
11522 minnode = maxnode = value;
11523 else if (tree_int_cst_lt (maxnode, value))
11525 else if (tree_int_cst_lt (value, minnode))
11532 If the enumerator-list is empty, the underlying type is as if
11533 the enumeration had a single enumerator with value 0. */
11534 minnode = maxnode = integer_zero_node;
11536 if (!fixed_underlying_type_p)
11538 /* Compute the number of bits require to represent all values of the
11539 enumeration. We must do this before the type of MINNODE and
11540 MAXNODE are transformed, since tree_int_cst_min_precision relies
11541 on the TREE_TYPE of the value it is passed. */
11542 bool unsignedp = tree_int_cst_sgn (minnode) >= 0;
11543 int lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11544 int highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11545 int precision = MAX (lowprec, highprec);
11547 bool use_short_enum;
11549 /* Determine the underlying type of the enumeration.
11553 The underlying type of an enumeration is an integral type that
11554 can represent all the enumerator values defined in the
11555 enumeration. It is implementation-defined which integral type is
11556 used as the underlying type for an enumeration except that the
11557 underlying type shall not be larger than int unless the value of
11558 an enumerator cannot fit in an int or unsigned int.
11560 We use "int" or an "unsigned int" as the underlying type, even if
11561 a smaller integral type would work, unless the user has
11562 explicitly requested that we use the smallest possible type. The
11563 user can request that for all enumerations with a command line
11564 flag, or for just one enumeration with an attribute. */
11566 use_short_enum = flag_short_enums
11567 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11569 for (itk = (use_short_enum ? itk_char : itk_int);
11573 underlying_type = integer_types[itk];
11574 if (underlying_type != NULL_TREE
11575 && TYPE_PRECISION (underlying_type) >= precision
11576 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11579 if (itk == itk_none)
11583 IF no integral type can represent all the enumerator values, the
11584 enumeration is ill-formed. */
11585 error ("no integral type can represent all of the enumerator values "
11586 "for %qT", enumtype);
11587 precision = TYPE_PRECISION (long_long_integer_type_node);
11588 underlying_type = integer_types[itk_unsigned_long_long];
11593 The value of sizeof() applied to an enumeration type, an object
11594 of an enumeration type, or an enumerator, is the value of sizeof()
11595 applied to the underlying type. */
11596 copy_type_enum (enumtype, underlying_type);
11598 /* Compute the minimum and maximum values for the type.
11602 For an enumeration where emin is the smallest enumerator and emax
11603 is the largest, the values of the enumeration are the values of the
11604 underlying type in the range bmin to bmax, where bmin and bmax are,
11605 respectively, the smallest and largest values of the smallest bit-
11606 field that can store emin and emax. */
11608 /* The middle-end currently assumes that types with TYPE_PRECISION
11609 narrower than their underlying type are suitably zero or sign
11610 extended to fill their mode. Similarly, it assumes that the front
11611 end assures that a value of a particular type must be within
11612 TYPE_MIN_VALUE and TYPE_MAX_VALUE.
11614 We used to set these fields based on bmin and bmax, but that led
11615 to invalid assumptions like optimizing away bounds checking. So
11616 now we just set the TYPE_PRECISION, TYPE_MIN_VALUE, and
11617 TYPE_MAX_VALUE to the values for the mode above and only restrict
11618 the ENUM_UNDERLYING_TYPE for the benefit of diagnostics. */
11619 ENUM_UNDERLYING_TYPE (enumtype)
11620 = build_distinct_type_copy (underlying_type);
11621 TYPE_PRECISION (ENUM_UNDERLYING_TYPE (enumtype)) = precision;
11622 set_min_and_max_values_for_integral_type
11623 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11625 /* If -fstrict-enums, still constrain TYPE_MIN/MAX_VALUE. */
11626 if (flag_strict_enums)
11627 set_min_and_max_values_for_integral_type (enumtype, precision,
11631 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11633 /* Convert each of the enumerators to the type of the underlying
11634 type of the enumeration. */
11635 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11637 location_t saved_location;
11639 decl = TREE_VALUE (values);
11640 saved_location = input_location;
11641 input_location = DECL_SOURCE_LOCATION (decl);
11642 if (fixed_underlying_type_p)
11643 /* If the enumeration type has a fixed underlying type, we
11644 already checked all of the enumerator values. */
11645 value = DECL_INITIAL (decl);
11647 value = perform_implicit_conversion (underlying_type,
11648 DECL_INITIAL (decl),
11649 tf_warning_or_error);
11650 input_location = saved_location;
11652 /* Do not clobber shared ints. */
11653 value = copy_node (value);
11655 TREE_TYPE (value) = enumtype;
11656 DECL_INITIAL (decl) = value;
11659 /* Fix up all variant types of this enum type. */
11660 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11661 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11663 /* Finish debugging output for this type. */
11664 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11667 /* Finishes the enum type. This is called only the first time an
11668 enumeration is seen, be it opaque or odinary.
11669 ENUMTYPE is the type object. */
11672 finish_enum (tree enumtype)
11674 if (processing_template_decl)
11676 if (at_function_scope_p ())
11677 add_stmt (build_min (TAG_DEFN, enumtype));
11681 /* Here there should not be any variants of this type. */
11682 gcc_assert (enumtype == TYPE_MAIN_VARIANT (enumtype)
11683 && !TYPE_NEXT_VARIANT (enumtype));
11686 /* Build and install a CONST_DECL for an enumeration constant of the
11687 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11688 LOC is the location of NAME.
11689 Assignment of sequential values by default is handled here. */
11692 build_enumerator (tree name, tree value, tree enumtype, location_t loc)
11698 /* If the VALUE was erroneous, pretend it wasn't there; that will
11699 result in the enum being assigned the next value in sequence. */
11700 if (value == error_mark_node)
11703 /* Remove no-op casts from the value. */
11705 STRIP_TYPE_NOPS (value);
11707 if (! processing_template_decl)
11709 /* Validate and default VALUE. */
11710 if (value != NULL_TREE)
11712 value = integral_constant_value (value);
11714 if (TREE_CODE (value) == INTEGER_CST)
11716 value = perform_integral_promotions (value);
11717 constant_expression_warning (value);
11721 error ("enumerator value for %qD is not an integer constant", name);
11726 /* Default based on previous value. */
11727 if (value == NULL_TREE)
11729 if (TYPE_VALUES (enumtype))
11732 unsigned HOST_WIDE_INT lo;
11736 /* The next value is the previous value plus one.
11737 add_double doesn't know the type of the target expression,
11738 so we must check with int_fits_type_p as well. */
11739 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11740 if (error_operand_p (prev_value))
11741 value = error_mark_node;
11744 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11745 TREE_INT_CST_HIGH (prev_value),
11747 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11749 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11753 error ("overflow in enumeration values at %qD", name);
11754 value = error_mark_node;
11759 value = integer_zero_node;
11762 /* Remove no-op casts from the value. */
11763 STRIP_TYPE_NOPS (value);
11765 /* If the underlying type of the enum is fixed, check whether
11766 the enumerator values fits in the underlying type. If it
11767 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11768 if (ENUM_UNDERLYING_TYPE (enumtype)
11770 && TREE_CODE (value) == INTEGER_CST
11771 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11773 error ("enumerator value %E is too large for underlying type %<%T%>",
11774 value, ENUM_UNDERLYING_TYPE (enumtype));
11776 /* Silently convert the value so that we can continue. */
11777 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11782 /* C++ associates enums with global, function, or class declarations. */
11783 context = current_scope ();
11785 /* Build the actual enumeration constant. Note that the enumeration
11786 constants have the underlying type of the enum (if it is fixed)
11787 or the type of their initializer (if the underlying type of the
11788 enum is not fixed):
11792 If the underlying type is fixed, the type of each enumerator
11793 prior to the closing brace is the underlying type; if the
11794 initializing value of an enumerator cannot be represented by
11795 the underlying type, the program is ill-formed. If the
11796 underlying type is not fixed, the type of each enumerator is
11797 the type of its initializing value.
11799 If the underlying type is not fixed, it will be computed by
11800 finish_enum and we will reset the type of this enumerator. Of
11801 course, if we're processing a template, there may be no value. */
11802 type = value ? TREE_TYPE (value) : NULL_TREE;
11804 if (context && context == current_class_type)
11805 /* This enum declaration is local to the class. We need the full
11806 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11807 decl = build_lang_decl_loc (loc, CONST_DECL, name, type);
11809 /* It's a global enum, or it's local to a function. (Note local to
11810 a function could mean local to a class method. */
11811 decl = build_decl (loc, CONST_DECL, name, type);
11813 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11814 TREE_CONSTANT (decl) = 1;
11815 TREE_READONLY (decl) = 1;
11816 DECL_INITIAL (decl) = value;
11818 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11819 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11820 on the TYPE_FIELDS list for `S'. (That's so that you can say
11821 things like `S::i' later.) */
11822 finish_member_declaration (decl);
11826 /* Add this enumeration constant to the list for this type. */
11827 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11830 /* Look for an enumerator with the given NAME within the enumeration
11831 type ENUMTYPE. This routine is used primarily for qualified name
11832 lookup into an enumerator in C++0x, e.g.,
11834 enum class Color { Red, Green, Blue };
11836 Color color = Color::Red;
11838 Returns the value corresponding to the enumerator, or
11839 NULL_TREE if no such enumerator was found. */
11841 lookup_enumerator (tree enumtype, tree name)
11844 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11846 e = purpose_member (name, TYPE_VALUES (enumtype));
11847 return e? TREE_VALUE (e) : NULL_TREE;
11851 /* We're defining DECL. Make sure that its type is OK. */
11854 check_function_type (tree decl, tree current_function_parms)
11856 tree fntype = TREE_TYPE (decl);
11857 tree return_type = complete_type (TREE_TYPE (fntype));
11859 /* In a function definition, arg types must be complete. */
11860 require_complete_types_for_parms (current_function_parms);
11862 /* constexpr functions must have literal argument types and
11863 literal return type. */
11864 validate_constexpr_fundecl (decl);
11866 if (dependent_type_p (return_type))
11868 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11869 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11871 tree args = TYPE_ARG_TYPES (fntype);
11873 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11874 error ("return type %q#T is incomplete", return_type);
11876 error ("return type has Java class type %q#T", return_type);
11878 /* Make it return void instead. */
11879 if (TREE_CODE (fntype) == METHOD_TYPE)
11880 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11882 TREE_CHAIN (args));
11884 fntype = build_function_type (void_type_node, args);
11886 = build_exception_variant (fntype,
11887 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11888 fntype = (cp_build_type_attribute_variant
11889 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11890 TREE_TYPE (decl) = fntype;
11893 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11896 /* Create the FUNCTION_DECL for a function definition.
11897 DECLSPECS and DECLARATOR are the parts of the declaration;
11898 they describe the function's name and the type it returns,
11899 but twisted together in a fashion that parallels the syntax of C.
11901 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11902 DECLARATOR is really the DECL for the function we are about to
11903 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11904 indicating that the function is an inline defined in-class.
11906 This function creates a binding context for the function body
11907 as well as setting up the FUNCTION_DECL in current_function_decl.
11909 For C++, we must first check whether that datum makes any sense.
11910 For example, "class A local_a(1,2);" means that variable local_a
11911 is an aggregate of type A, which should have a constructor
11912 applied to it with the argument list [1, 2].
11914 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11915 or may be a BLOCK if the function has been defined previously
11916 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11917 error_mark_node if the function has never been defined, or
11918 a BLOCK if the function has been defined somewhere. */
11921 start_preparsed_function (tree decl1, tree attrs, int flags)
11923 tree ctype = NULL_TREE;
11926 int doing_friend = 0;
11927 struct cp_binding_level *bl;
11928 tree current_function_parms;
11929 struct c_fileinfo *finfo
11930 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11931 bool honor_interface;
11933 /* Sanity check. */
11934 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11935 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11937 fntype = TREE_TYPE (decl1);
11938 if (TREE_CODE (fntype) == METHOD_TYPE)
11939 ctype = TYPE_METHOD_BASETYPE (fntype);
11941 /* ISO C++ 11.4/5. A friend function defined in a class is in
11942 the (lexical) scope of the class in which it is defined. */
11943 if (!ctype && DECL_FRIEND_P (decl1))
11945 ctype = DECL_FRIEND_CONTEXT (decl1);
11947 /* CTYPE could be null here if we're dealing with a template;
11948 for example, `inline friend float foo()' inside a template
11949 will have no CTYPE set. */
11950 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11956 if (DECL_DECLARED_INLINE_P (decl1)
11957 && lookup_attribute ("noinline", attrs))
11958 warning (0, "inline function %q+D given attribute noinline", decl1);
11960 /* Handle gnu_inline attribute. */
11961 if (GNU_INLINE_P (decl1))
11963 DECL_EXTERNAL (decl1) = 1;
11964 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11965 DECL_INTERFACE_KNOWN (decl1) = 1;
11966 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11969 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11970 /* This is a constructor, we must ensure that any default args
11971 introduced by this definition are propagated to the clones
11972 now. The clones are used directly in overload resolution. */
11973 adjust_clone_args (decl1);
11975 /* Sometimes we don't notice that a function is a static member, and
11976 build a METHOD_TYPE for it. Fix that up now. */
11977 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11978 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11980 revert_static_member_fn (decl1);
11984 /* Set up current_class_type, and enter the scope of the class, if
11987 push_nested_class (ctype);
11988 else if (DECL_STATIC_FUNCTION_P (decl1))
11989 push_nested_class (DECL_CONTEXT (decl1));
11991 /* Now that we have entered the scope of the class, we must restore
11992 the bindings for any template parameters surrounding DECL1, if it
11993 is an inline member template. (Order is important; consider the
11994 case where a template parameter has the same name as a field of
11995 the class.) It is not until after this point that
11996 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11997 if (flags & SF_INCLASS_INLINE)
11998 maybe_begin_member_template_processing (decl1);
12000 /* Effective C++ rule 15. */
12002 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
12003 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
12004 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
12006 /* Make the init_value nonzero so pushdecl knows this is not tentative.
12007 error_mark_node is replaced below (in poplevel) with the BLOCK. */
12008 if (!DECL_INITIAL (decl1))
12009 DECL_INITIAL (decl1) = error_mark_node;
12011 /* This function exists in static storage.
12012 (This does not mean `static' in the C sense!) */
12013 TREE_STATIC (decl1) = 1;
12015 /* We must call push_template_decl after current_class_type is set
12016 up. (If we are processing inline definitions after exiting a
12017 class scope, current_class_type will be NULL_TREE until set above
12018 by push_nested_class.) */
12019 if (processing_template_decl)
12021 /* FIXME: Handle error_mark_node more gracefully. */
12022 tree newdecl1 = push_template_decl (decl1);
12023 if (newdecl1 != error_mark_node)
12027 /* We are now in the scope of the function being defined. */
12028 current_function_decl = decl1;
12030 /* Save the parm names or decls from this function's declarator
12031 where store_parm_decls will find them. */
12032 current_function_parms = DECL_ARGUMENTS (decl1);
12034 /* Make sure the parameter and return types are reasonable. When
12035 you declare a function, these types can be incomplete, but they
12036 must be complete when you define the function. */
12037 check_function_type (decl1, current_function_parms);
12039 /* Build the return declaration for the function. */
12040 restype = TREE_TYPE (fntype);
12041 if (DECL_RESULT (decl1) == NULL_TREE)
12045 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
12046 DECL_ARTIFICIAL (resdecl) = 1;
12047 DECL_IGNORED_P (resdecl) = 1;
12048 DECL_RESULT (decl1) = resdecl;
12050 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
12053 /* Let the user know we're compiling this function. */
12054 announce_function (decl1);
12056 /* Record the decl so that the function name is defined.
12057 If we already have a decl for this name, and it is a FUNCTION_DECL,
12058 use the old decl. */
12059 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
12061 /* A specialization is not used to guide overload resolution. */
12062 if (!DECL_FUNCTION_MEMBER_P (decl1)
12063 && !(DECL_USE_TEMPLATE (decl1) &&
12064 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
12066 tree olddecl = pushdecl (decl1);
12068 if (olddecl == error_mark_node)
12069 /* If something went wrong when registering the declaration,
12070 use DECL1; we have to have a FUNCTION_DECL to use when
12071 parsing the body of the function. */
12075 /* Otherwise, OLDDECL is either a previous declaration
12076 of the same function or DECL1 itself. */
12078 if (warn_missing_declarations
12079 && olddecl == decl1
12080 && !DECL_MAIN_P (decl1)
12081 && TREE_PUBLIC (decl1)
12082 && !DECL_DECLARED_INLINE_P (decl1))
12086 /* Check whether DECL1 is in an anonymous
12088 for (context = DECL_CONTEXT (decl1);
12090 context = DECL_CONTEXT (context))
12092 if (TREE_CODE (context) == NAMESPACE_DECL
12093 && DECL_NAME (context) == NULL_TREE)
12097 if (context == NULL)
12098 warning (OPT_Wmissing_declarations,
12099 "no previous declaration for %q+D", decl1);
12107 /* We need to set the DECL_CONTEXT. */
12108 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
12109 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
12111 fntype = TREE_TYPE (decl1);
12113 /* If #pragma weak applies, mark the decl appropriately now.
12114 The pragma only applies to global functions. Because
12115 determining whether or not the #pragma applies involves
12116 computing the mangled name for the declaration, we cannot
12117 apply the pragma until after we have merged this declaration
12118 with any previous declarations; if the original declaration
12119 has a linkage specification, that specification applies to
12120 the definition as well, and may affect the mangled name. */
12121 if (DECL_FILE_SCOPE_P (decl1))
12122 maybe_apply_pragma_weak (decl1);
12125 /* Reset this in case the call to pushdecl changed it. */
12126 current_function_decl = decl1;
12128 gcc_assert (DECL_INITIAL (decl1));
12130 /* This function may already have been parsed, in which case just
12131 return; our caller will skip over the body without parsing. */
12132 if (DECL_INITIAL (decl1) != error_mark_node)
12135 /* Initialize RTL machinery. We cannot do this until
12136 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
12137 even when processing a template; this is how we get
12138 CFUN set up, and our per-function variables initialized.
12139 FIXME factor out the non-RTL stuff. */
12140 bl = current_binding_level;
12141 allocate_struct_function (decl1, processing_template_decl);
12143 /* Initialize the language data structures. Whenever we start
12144 a new function, we destroy temporaries in the usual way. */
12145 cfun->language = ggc_alloc_cleared_language_function ();
12146 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12147 current_binding_level = bl;
12149 /* Even though we're inside a function body, we still don't want to
12150 call expand_expr to calculate the size of a variable-sized array.
12151 We haven't necessarily assigned RTL to all variables yet, so it's
12152 not safe to try to expand expressions involving them. */
12153 cfun->dont_save_pending_sizes_p = 1;
12155 /* Start the statement-tree, start the tree now. */
12156 DECL_SAVED_TREE (decl1) = push_stmt_list ();
12158 /* If we are (erroneously) defining a function that we have already
12159 defined before, wipe out what we knew before. */
12160 if (!DECL_PENDING_INLINE_P (decl1))
12161 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
12163 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
12165 /* We know that this was set up by `grokclassfn'. We do not
12166 wait until `store_parm_decls', since evil parse errors may
12167 never get us to that point. Here we keep the consistency
12168 between `current_class_type' and `current_class_ptr'. */
12169 tree t = DECL_ARGUMENTS (decl1);
12171 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
12172 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
12174 cp_function_chain->x_current_class_ref
12175 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
12176 cp_function_chain->x_current_class_ptr = t;
12178 /* Constructors and destructors need to know whether they're "in
12179 charge" of initializing virtual base classes. */
12180 t = DECL_CHAIN (t);
12181 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
12183 current_in_charge_parm = t;
12184 t = DECL_CHAIN (t);
12186 if (DECL_HAS_VTT_PARM_P (decl1))
12188 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
12189 current_vtt_parm = t;
12193 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
12194 /* Implicitly-defined methods (like the
12195 destructor for a class in which no destructor
12196 is explicitly declared) must not be defined
12197 until their definition is needed. So, we
12198 ignore interface specifications for
12199 compiler-generated functions. */
12200 && !DECL_ARTIFICIAL (decl1));
12202 if (DECL_INTERFACE_KNOWN (decl1))
12204 tree ctx = decl_function_context (decl1);
12206 if (DECL_NOT_REALLY_EXTERN (decl1))
12207 DECL_EXTERNAL (decl1) = 0;
12209 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
12210 && TREE_PUBLIC (ctx))
12211 /* This is a function in a local class in an extern inline
12213 comdat_linkage (decl1);
12215 /* If this function belongs to an interface, it is public.
12216 If it belongs to someone else's interface, it is also external.
12217 This only affects inlines and template instantiations. */
12218 else if (!finfo->interface_unknown && honor_interface)
12220 if (DECL_DECLARED_INLINE_P (decl1)
12221 || DECL_TEMPLATE_INSTANTIATION (decl1)
12222 || processing_template_decl)
12224 DECL_EXTERNAL (decl1)
12225 = (finfo->interface_only
12226 || (DECL_DECLARED_INLINE_P (decl1)
12227 && ! flag_implement_inlines
12228 && !DECL_VINDEX (decl1)));
12230 /* For WIN32 we also want to put these in linkonce sections. */
12231 maybe_make_one_only (decl1);
12234 DECL_EXTERNAL (decl1) = 0;
12235 DECL_INTERFACE_KNOWN (decl1) = 1;
12236 /* If this function is in an interface implemented in this file,
12237 make sure that the back end knows to emit this function
12239 if (!DECL_EXTERNAL (decl1))
12240 mark_needed (decl1);
12242 else if (finfo->interface_unknown && finfo->interface_only
12243 && honor_interface)
12245 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12246 interface, we will have both finfo->interface_unknown and
12247 finfo->interface_only set. In that case, we don't want to
12248 use the normal heuristics because someone will supply a
12249 #pragma implementation elsewhere, and deducing it here would
12250 produce a conflict. */
12251 comdat_linkage (decl1);
12252 DECL_EXTERNAL (decl1) = 0;
12253 DECL_INTERFACE_KNOWN (decl1) = 1;
12254 DECL_DEFER_OUTPUT (decl1) = 1;
12258 /* This is a definition, not a reference.
12259 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12260 if (!GNU_INLINE_P (decl1))
12261 DECL_EXTERNAL (decl1) = 0;
12263 if ((DECL_DECLARED_INLINE_P (decl1)
12264 || DECL_TEMPLATE_INSTANTIATION (decl1))
12265 && ! DECL_INTERFACE_KNOWN (decl1))
12266 DECL_DEFER_OUTPUT (decl1) = 1;
12268 DECL_INTERFACE_KNOWN (decl1) = 1;
12271 /* Determine the ELF visibility attribute for the function. We must not
12272 do this before calling "pushdecl", as we must allow "duplicate_decls"
12273 to merge any attributes appropriately. We also need to wait until
12275 if (!DECL_CLONED_FUNCTION_P (decl1))
12276 determine_visibility (decl1);
12278 begin_scope (sk_function_parms, decl1);
12282 if (DECL_DESTRUCTOR_P (decl1)
12283 || (DECL_CONSTRUCTOR_P (decl1)
12284 && targetm.cxx.cdtor_returns_this ()))
12286 cdtor_label = build_decl (input_location,
12287 LABEL_DECL, NULL_TREE, NULL_TREE);
12288 DECL_CONTEXT (cdtor_label) = current_function_decl;
12291 start_fname_decls ();
12293 store_parm_decls (current_function_parms);
12297 /* Like start_preparsed_function, except that instead of a
12298 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12300 Returns 1 on success. If the DECLARATOR is not suitable for a function
12301 (it defines a datum instead), we return 0, which tells
12302 yyparse to report a parse error. */
12305 start_function (cp_decl_specifier_seq *declspecs,
12306 const cp_declarator *declarator,
12311 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12312 if (decl1 == error_mark_node)
12314 /* If the declarator is not suitable for a function definition,
12315 cause a syntax error. */
12316 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12318 error ("invalid function declaration");
12322 if (DECL_MAIN_P (decl1))
12323 /* main must return int. grokfndecl should have corrected it
12324 (and issued a diagnostic) if the user got it wrong. */
12325 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12326 integer_type_node));
12328 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12333 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12337 use_eh_spec_block (tree fn)
12339 return (flag_exceptions && flag_enforce_eh_specs
12340 && !processing_template_decl
12341 && !type_throw_all_p (TREE_TYPE (fn))
12342 /* We insert the EH_SPEC_BLOCK only in the original
12343 function; then, it is copied automatically to the
12345 && !DECL_CLONED_FUNCTION_P (fn)
12346 /* Implicitly-generated constructors and destructors have
12347 exception specifications. However, those specifications
12348 are the union of the possible exceptions specified by the
12349 constructors/destructors for bases and members, so no
12350 unallowed exception will ever reach this function. By
12351 not creating the EH_SPEC_BLOCK we save a little memory,
12352 and we avoid spurious warnings about unreachable
12354 && !DECL_ARTIFICIAL (fn));
12357 /* Store the parameter declarations into the current function declaration.
12358 This is called after parsing the parameter declarations, before
12359 digesting the body of the function.
12361 Also install to binding contour return value identifier, if any. */
12364 store_parm_decls (tree current_function_parms)
12366 tree fndecl = current_function_decl;
12369 /* This is a chain of any other decls that came in among the parm
12370 declarations. If a parm is declared with enum {foo, bar} x;
12371 then CONST_DECLs for foo and bar are put here. */
12372 tree nonparms = NULL_TREE;
12374 if (current_function_parms)
12376 /* This case is when the function was defined with an ANSI prototype.
12377 The parms already have decls, so we need not do anything here
12378 except record them as in effect
12379 and complain if any redundant old-style parm decls were written. */
12381 tree specparms = current_function_parms;
12384 /* Must clear this because it might contain TYPE_DECLs declared
12386 current_binding_level->names = NULL;
12388 /* If we're doing semantic analysis, then we'll call pushdecl
12389 for each of these. We must do them in reverse order so that
12390 they end in the correct forward order. */
12391 specparms = nreverse (specparms);
12393 for (parm = specparms; parm; parm = next)
12395 next = DECL_CHAIN (parm);
12396 if (TREE_CODE (parm) == PARM_DECL)
12398 if (DECL_NAME (parm) == NULL_TREE
12399 || TREE_CODE (parm) != VOID_TYPE)
12402 error ("parameter %qD declared void", parm);
12406 /* If we find an enum constant or a type tag,
12407 put it aside for the moment. */
12408 TREE_CHAIN (parm) = NULL_TREE;
12409 nonparms = chainon (nonparms, parm);
12413 /* Get the decls in their original chain order and record in the
12414 function. This is all and only the PARM_DECLs that were
12415 pushed into scope by the loop above. */
12416 DECL_ARGUMENTS (fndecl) = getdecls ();
12419 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12421 /* Now store the final chain of decls for the arguments
12422 as the decl-chain of the current lexical scope.
12423 Put the enumerators in as well, at the front so that
12424 DECL_ARGUMENTS is not modified. */
12425 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12427 if (use_eh_spec_block (current_function_decl))
12428 current_eh_spec_block = begin_eh_spec_block ();
12432 /* We have finished doing semantic analysis on DECL, but have not yet
12433 generated RTL for its body. Save away our current state, so that
12434 when we want to generate RTL later we know what to do. */
12437 save_function_data (tree decl)
12439 struct language_function *f;
12441 /* Save the language-specific per-function data so that we can
12442 get it back when we really expand this function. */
12443 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12446 f = ggc_alloc_language_function ();
12447 memcpy (f, cp_function_chain, sizeof (struct language_function));
12448 DECL_SAVED_FUNCTION_DATA (decl) = f;
12450 /* Clear out the bits we don't need. */
12451 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12452 f->bindings = NULL;
12453 f->x_local_names = NULL;
12457 /* Set the return value of the constructor (if present). */
12460 finish_constructor_body (void)
12465 if (targetm.cxx.cdtor_returns_this ()
12466 && (! TYPE_FOR_JAVA (current_class_type)))
12468 /* Any return from a constructor will end up here. */
12469 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12471 val = DECL_ARGUMENTS (current_function_decl);
12472 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12473 DECL_RESULT (current_function_decl), val);
12474 /* Return the address of the object. */
12475 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12476 add_stmt (exprstmt);
12480 /* Do all the processing for the beginning of a destructor; set up the
12481 vtable pointers and cleanups for bases and members. */
12484 begin_destructor_body (void)
12486 tree compound_stmt;
12488 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12489 issued an error message. We still want to try to process the
12490 body of the function, but initialize_vtbl_ptrs will crash if
12491 TYPE_BINFO is NULL. */
12492 if (COMPLETE_TYPE_P (current_class_type))
12494 compound_stmt = begin_compound_stmt (0);
12495 /* Make all virtual function table pointers in non-virtual base
12496 classes point to CURRENT_CLASS_TYPE's virtual function
12498 initialize_vtbl_ptrs (current_class_ptr);
12499 finish_compound_stmt (compound_stmt);
12501 /* And insert cleanups for our bases and members so that they
12502 will be properly destroyed if we throw. */
12503 push_base_cleanups ();
12507 /* At the end of every destructor we generate code to delete the object if
12508 necessary. Do that now. */
12511 finish_destructor_body (void)
12515 /* Any return from a destructor will end up here; that way all base
12516 and member cleanups will be run when the function returns. */
12517 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12519 /* In a virtual destructor, we must call delete. */
12520 if (DECL_VIRTUAL_P (current_function_decl))
12523 tree virtual_size = cxx_sizeof (current_class_type);
12527 At the point of definition of a virtual destructor (including
12528 an implicit definition), non-placement operator delete shall
12529 be looked up in the scope of the destructor's class and if
12530 found shall be accessible and unambiguous. */
12531 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12533 /*global_p=*/false,
12534 /*placement=*/NULL_TREE,
12535 /*alloc_fn=*/NULL_TREE);
12537 if_stmt = begin_if_stmt ();
12538 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12539 current_in_charge_parm,
12542 finish_expr_stmt (exprstmt);
12543 finish_then_clause (if_stmt);
12544 finish_if_stmt (if_stmt);
12547 if (targetm.cxx.cdtor_returns_this ())
12551 val = DECL_ARGUMENTS (current_function_decl);
12552 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12553 DECL_RESULT (current_function_decl), val);
12554 /* Return the address of the object. */
12555 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12556 add_stmt (exprstmt);
12560 /* Do the necessary processing for the beginning of a function body, which
12561 in this case includes member-initializers, but not the catch clauses of
12562 a function-try-block. Currently, this means opening a binding level
12563 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12566 begin_function_body (void)
12570 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12573 if (processing_template_decl)
12574 /* Do nothing now. */;
12576 /* Always keep the BLOCK node associated with the outermost pair of
12577 curly braces of a function. These are needed for correct
12578 operation of dwarfout.c. */
12579 keep_next_level (true);
12581 stmt = begin_compound_stmt (BCS_FN_BODY);
12583 if (processing_template_decl)
12584 /* Do nothing now. */;
12585 else if (DECL_DESTRUCTOR_P (current_function_decl))
12586 begin_destructor_body ();
12591 /* Do the processing for the end of a function body. Currently, this means
12592 closing out the cleanups for fully-constructed bases and members, and in
12593 the case of the destructor, deleting the object if desired. Again, this
12594 is only meaningful for [cd]tors, since they are the only functions where
12595 there is a significant distinction between the main body and any
12596 function catch clauses. Handling, say, main() return semantics here
12597 would be wrong, as flowing off the end of a function catch clause for
12598 main() would also need to return 0. */
12601 finish_function_body (tree compstmt)
12603 if (compstmt == NULL_TREE)
12606 /* Close the block. */
12607 finish_compound_stmt (compstmt);
12609 if (processing_template_decl)
12610 /* Do nothing now. */;
12611 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12612 finish_constructor_body ();
12613 else if (DECL_DESTRUCTOR_P (current_function_decl))
12614 finish_destructor_body ();
12617 /* Given a function, returns the BLOCK corresponding to the outermost level
12618 of curly braces, skipping the artificial block created for constructor
12622 outer_curly_brace_block (tree fndecl)
12624 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12625 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12626 /* Skip the artificial function body block. */
12627 block = BLOCK_SUBBLOCKS (block);
12631 /* If FNDECL is a class's key method, add the class to the list of
12632 keyed classes that should be emitted. */
12635 record_key_method_defined (tree fndecl)
12637 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12638 && DECL_VIRTUAL_P (fndecl)
12639 && !processing_template_decl)
12641 tree fnclass = DECL_CONTEXT (fndecl);
12642 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12643 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12647 /* Finish up a function declaration and compile that function
12648 all the way to assembler language output. The free the storage
12649 for the function definition.
12651 FLAGS is a bitwise or of the following values:
12653 We just finished processing the body of an in-class inline
12654 function definition. (This processing will have taken place
12655 after the class definition is complete.) */
12658 finish_function (int flags)
12660 tree fndecl = current_function_decl;
12661 tree fntype, ctype = NULL_TREE;
12662 int inclass_inline = (flags & 2) != 0;
12664 /* When we get some parse errors, we can end up without a
12665 current_function_decl, so cope. */
12666 if (fndecl == NULL_TREE)
12667 return error_mark_node;
12669 gcc_assert (!defer_mark_used_calls);
12670 defer_mark_used_calls = true;
12672 record_key_method_defined (fndecl);
12674 fntype = TREE_TYPE (fndecl);
12676 /* TREE_READONLY (fndecl) = 1;
12677 This caused &foo to be of type ptr-to-const-function
12678 which then got a warning when stored in a ptr-to-function variable. */
12680 gcc_assert (building_stmt_tree ());
12681 /* The current function is being defined, so its DECL_INITIAL should
12682 be set, and unless there's a multiple definition, it should be
12683 error_mark_node. */
12684 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12686 /* For a cloned function, we've already got all the code we need;
12687 there's no need to add any extra bits. */
12688 if (!DECL_CLONED_FUNCTION_P (fndecl))
12690 if (DECL_MAIN_P (current_function_decl))
12694 /* Make it so that `main' always returns 0 by default (or
12697 stmt = finish_return_stmt (integer_one_node);
12699 stmt = finish_return_stmt (integer_zero_node);
12701 /* Hack. We don't want the middle-end to warn that this
12702 return is unreachable, so put the statement on the
12705 location_t linezero = linemap_line_start (line_table, 0, 1);
12706 SET_EXPR_LOCATION (stmt, linezero);
12710 if (use_eh_spec_block (current_function_decl))
12711 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12712 (TREE_TYPE (current_function_decl)),
12713 current_eh_spec_block);
12716 /* If we're saving up tree structure, tie off the function now. */
12717 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12719 finish_fname_decls ();
12721 /* If this function can't throw any exceptions, remember that. */
12722 if (!processing_template_decl
12723 && !cp_function_chain->can_throw
12724 && !flag_non_call_exceptions
12725 && !decl_replaceable_p (fndecl))
12726 TREE_NOTHROW (fndecl) = 1;
12728 /* This must come after expand_function_end because cleanups might
12729 have declarations (from inline functions) that need to go into
12730 this function's blocks. */
12732 /* If the current binding level isn't the outermost binding level
12733 for this function, either there is a bug, or we have experienced
12734 syntax errors and the statement tree is malformed. */
12735 if (current_binding_level->kind != sk_function_parms)
12737 /* Make sure we have already experienced errors. */
12738 gcc_assert (errorcount);
12740 /* Throw away the broken statement tree and extra binding
12742 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12744 while (current_binding_level->kind != sk_function_parms)
12746 if (current_binding_level->kind == sk_class)
12747 pop_nested_class ();
12749 poplevel (0, 0, 0);
12752 poplevel (1, 0, 1);
12754 /* Statements should always be full-expressions at the outermost set
12755 of curly braces for a function. */
12756 gcc_assert (stmts_are_full_exprs_p ());
12758 /* Set up the named return value optimization, if we can. Candidate
12759 variables are selected in check_return_expr. */
12760 if (current_function_return_value)
12762 tree r = current_function_return_value;
12765 if (r != error_mark_node
12766 /* This is only worth doing for fns that return in memory--and
12767 simpler, since we don't have to worry about promoted modes. */
12768 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12769 /* Only allow this for variables declared in the outer scope of
12770 the function so we know that their lifetime always ends with a
12771 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12772 we were to do this optimization in tree-ssa. */
12773 && (outer = outer_curly_brace_block (fndecl))
12774 && chain_member (r, BLOCK_VARS (outer)))
12775 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12777 current_function_return_value = NULL_TREE;
12780 /* Remember that we were in class scope. */
12781 if (current_class_name)
12782 ctype = current_class_type;
12784 /* Must mark the RESULT_DECL as being in this function. */
12785 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12787 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12788 to the FUNCTION_DECL node itself. */
12789 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12791 /* Save away current state, if appropriate. */
12792 if (!processing_template_decl)
12793 save_function_data (fndecl);
12795 /* Complain if there's just no return statement. */
12796 if (warn_return_type
12797 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12798 && !dependent_type_p (TREE_TYPE (fntype))
12799 && !current_function_returns_value && !current_function_returns_null
12800 /* Don't complain if we abort or throw. */
12801 && !current_function_returns_abnormally
12802 /* Don't complain if we are declared noreturn. */
12803 && !TREE_THIS_VOLATILE (fndecl)
12804 && !DECL_NAME (DECL_RESULT (fndecl))
12805 && !TREE_NO_WARNING (fndecl)
12806 /* Structor return values (if any) are set by the compiler. */
12807 && !DECL_CONSTRUCTOR_P (fndecl)
12808 && !DECL_DESTRUCTOR_P (fndecl))
12810 warning (OPT_Wreturn_type,
12811 "no return statement in function returning non-void");
12812 TREE_NO_WARNING (fndecl) = 1;
12815 /* Store the end of the function, so that we get good line number
12816 info for the epilogue. */
12817 cfun->function_end_locus = input_location;
12819 /* Complain about parameters that are only set, but never otherwise used. */
12820 if (warn_unused_but_set_parameter
12821 && !processing_template_decl
12822 && errorcount == unused_but_set_errorcount
12823 && !DECL_CLONED_FUNCTION_P (fndecl))
12827 for (decl = DECL_ARGUMENTS (fndecl);
12829 decl = DECL_CHAIN (decl))
12830 if (TREE_USED (decl)
12831 && TREE_CODE (decl) == PARM_DECL
12832 && !DECL_READ_P (decl)
12833 && DECL_NAME (decl)
12834 && !DECL_ARTIFICIAL (decl)
12835 && !TREE_NO_WARNING (decl)
12836 && !DECL_IN_SYSTEM_HEADER (decl)
12837 && TREE_TYPE (decl) != error_mark_node
12838 && TREE_CODE (TREE_TYPE (decl)) != REFERENCE_TYPE
12839 && (!CLASS_TYPE_P (TREE_TYPE (decl))
12840 || !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
12841 warning (OPT_Wunused_but_set_parameter,
12842 "parameter %q+D set but not used", decl);
12843 unused_but_set_errorcount = errorcount;
12846 /* Genericize before inlining. */
12847 if (!processing_template_decl)
12849 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12850 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
12851 cp_genericize (fndecl);
12852 /* Clear out the bits we don't need. */
12853 f->x_current_class_ptr = NULL;
12854 f->x_current_class_ref = NULL;
12855 f->x_eh_spec_block = NULL;
12856 f->x_in_charge_parm = NULL;
12857 f->x_vtt_parm = NULL;
12858 f->x_return_value = NULL;
12859 f->bindings = NULL;
12860 f->extern_decl_map = NULL;
12862 /* Clear out the bits we don't need. */
12863 local_names = NULL;
12865 /* We're leaving the context of this function, so zap cfun. It's still in
12866 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12868 current_function_decl = NULL;
12870 /* If this is an in-class inline definition, we may have to pop the
12871 bindings for the template parameters that we added in
12872 maybe_begin_member_template_processing when start_function was
12874 if (inclass_inline)
12875 maybe_end_member_template_processing ();
12877 /* Leave the scope of the class. */
12879 pop_nested_class ();
12884 current_function_decl = NULL_TREE;
12886 defer_mark_used_calls = false;
12887 if (deferred_mark_used_calls)
12892 FOR_EACH_VEC_ELT (tree, deferred_mark_used_calls, i, decl)
12894 VEC_free (tree, gc, deferred_mark_used_calls);
12900 /* Create the FUNCTION_DECL for a function definition.
12901 DECLSPECS and DECLARATOR are the parts of the declaration;
12902 they describe the return type and the name of the function,
12903 but twisted together in a fashion that parallels the syntax of C.
12905 This function creates a binding context for the function body
12906 as well as setting up the FUNCTION_DECL in current_function_decl.
12908 Returns a FUNCTION_DECL on success.
12910 If the DECLARATOR is not suitable for a function (it defines a datum
12911 instead), we return 0, which tells yyparse to report a parse error.
12913 May return void_type_node indicating that this method is actually
12914 a friend. See grokfield for more details.
12916 Came here with a `.pushlevel' .
12918 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12919 CHANGES TO CODE IN `grokfield'. */
12922 grokmethod (cp_decl_specifier_seq *declspecs,
12923 const cp_declarator *declarator, tree attrlist)
12925 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12928 if (fndecl == error_mark_node)
12929 return error_mark_node;
12931 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12933 error ("invalid member function declaration");
12934 return error_mark_node;
12938 cplus_decl_attributes (&fndecl, attrlist, 0);
12940 /* Pass friends other than inline friend functions back. */
12941 if (fndecl == void_type_node)
12944 if (DECL_IN_AGGR_P (fndecl))
12946 if (DECL_CONTEXT (fndecl)
12947 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12948 error ("%qD is already defined in class %qT", fndecl,
12949 DECL_CONTEXT (fndecl));
12950 return error_mark_node;
12953 check_template_shadow (fndecl);
12955 DECL_DECLARED_INLINE_P (fndecl) = 1;
12956 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12958 /* We process method specializations in finish_struct_1. */
12959 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12961 fndecl = push_template_decl (fndecl);
12962 if (fndecl == error_mark_node)
12966 if (! DECL_FRIEND_P (fndecl))
12968 if (DECL_CHAIN (fndecl))
12970 fndecl = copy_node (fndecl);
12971 TREE_CHAIN (fndecl) = NULL_TREE;
12975 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12977 DECL_IN_AGGR_P (fndecl) = 1;
12982 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12983 we can lay it out later, when and if its type becomes complete. */
12986 maybe_register_incomplete_var (tree var)
12988 gcc_assert (TREE_CODE (var) == VAR_DECL);
12990 /* Keep track of variables with incomplete types. */
12991 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12992 && DECL_EXTERNAL (var))
12994 tree inner_type = TREE_TYPE (var);
12996 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12997 inner_type = TREE_TYPE (inner_type);
12998 inner_type = TYPE_MAIN_VARIANT (inner_type);
13000 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
13001 /* RTTI TD entries are created while defining the type_info. */
13002 || (TYPE_LANG_SPECIFIC (inner_type)
13003 && TYPE_BEING_DEFINED (inner_type)))
13006 = VEC_safe_push (incomplete_var, gc, incomplete_vars, NULL);
13008 iv->incomplete_type = inner_type;
13013 /* Called when a class type (given by TYPE) is defined. If there are
13014 any existing VAR_DECLs whose type has been completed by this
13015 declaration, update them now. */
13018 complete_vars (tree type)
13021 incomplete_var *iv;
13023 for (ix = 0; VEC_iterate (incomplete_var, incomplete_vars, ix, iv); )
13025 if (same_type_p (type, iv->incomplete_type))
13027 tree var = iv->decl;
13028 tree type = TREE_TYPE (var);
13029 /* Complete the type of the variable. The VAR_DECL itself
13030 will be laid out in expand_expr. */
13031 complete_type (type);
13032 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
13033 /* Remove this entry from the list. */
13034 VEC_unordered_remove (incomplete_var, incomplete_vars, ix);
13040 /* Check for pending declarations which may have abstract type. */
13041 complete_type_check_abstract (type);
13044 /* If DECL is of a type which needs a cleanup, build and return an
13045 expression to perform that cleanup here. Return NULL_TREE if no
13046 cleanup need be done. */
13049 cxx_maybe_build_cleanup (tree decl)
13055 /* Assume no cleanup is required. */
13056 cleanup = NULL_TREE;
13058 if (error_operand_p (decl))
13061 /* Handle "__attribute__((cleanup))". We run the cleanup function
13062 before the destructor since the destructor is what actually
13063 terminates the lifetime of the object. */
13064 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
13071 /* Get the name specified by the user for the cleanup function. */
13072 id = TREE_VALUE (TREE_VALUE (attr));
13073 /* Look up the name to find the cleanup function to call. It is
13074 important to use lookup_name here because that is what is
13075 used in c-common.c:handle_cleanup_attribute when performing
13076 initial checks on the attribute. Note that those checks
13077 include ensuring that the function found is not an overloaded
13078 function, or an object with an overloaded call operator,
13079 etc.; we can rely on the fact that the function found is an
13080 ordinary FUNCTION_DECL. */
13081 fn = lookup_name (id);
13082 arg = build_address (decl);
13084 cleanup = cp_build_function_call_nary (fn, tf_warning_or_error,
13087 /* Handle ordinary C++ destructors. */
13088 type = TREE_TYPE (decl);
13089 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
13091 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
13092 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
13093 && CLASSTYPE_VBASECLASSES (type));
13097 if (TREE_CODE (type) == ARRAY_TYPE)
13100 addr = build_address (decl);
13102 /* Optimize for space over speed here. */
13103 if (!has_vbases || flag_expensive_optimizations)
13104 flags |= LOOKUP_NONVIRTUAL;
13106 call = build_delete (TREE_TYPE (addr), addr,
13107 sfk_complete_destructor, flags, 0);
13109 cleanup = build_compound_expr (input_location, cleanup, call);
13117 /* When a stmt has been parsed, this function is called. */
13124 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
13125 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
13126 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
13129 static_fn_type (tree memfntype)
13134 if (TYPE_PTRMEMFUNC_P (memfntype))
13135 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
13136 if (POINTER_TYPE_P (memfntype)
13137 || TREE_CODE (memfntype) == FUNCTION_DECL)
13138 memfntype = TREE_TYPE (memfntype);
13139 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
13141 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
13142 args = TYPE_ARG_TYPES (memfntype);
13143 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
13144 fntype = apply_memfn_quals (fntype, type_memfn_quals (memfntype));
13145 fntype = (cp_build_type_attribute_variant
13146 (fntype, TYPE_ATTRIBUTES (memfntype)));
13147 fntype = (build_exception_variant
13148 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
13152 /* DECL was originally constructed as a non-static member function,
13153 but turned out to be static. Update it accordingly. */
13156 revert_static_member_fn (tree decl)
13158 TREE_TYPE (decl) = static_fn_type (decl);
13160 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
13161 error ("static member function %q#D declared with type qualifiers", decl);
13163 if (DECL_ARGUMENTS (decl))
13164 DECL_ARGUMENTS (decl) = DECL_CHAIN (DECL_ARGUMENTS (decl));
13165 DECL_STATIC_FUNCTION_P (decl) = 1;
13168 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
13169 one of the language-independent trees. */
13171 enum cp_tree_node_structure_enum
13172 cp_tree_node_structure (union lang_tree_node * t)
13174 switch (TREE_CODE (&t->generic))
13176 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
13177 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
13178 case OVERLOAD: return TS_CP_OVERLOAD;
13179 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
13180 case PTRMEM_CST: return TS_CP_PTRMEM;
13181 case BASELINK: return TS_CP_BASELINK;
13182 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
13183 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
13184 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
13185 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
13186 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
13187 default: return TS_CP_GENERIC;
13191 /* Build the void_list_node (void_type_node having been created). */
13193 build_void_list_node (void)
13195 tree t = build_tree_list (NULL_TREE, void_type_node);
13200 cp_missing_noreturn_ok_p (tree decl)
13202 /* A missing noreturn is ok for the `main' function. */
13203 return DECL_MAIN_P (decl);
13206 /* Return the COMDAT group into which DECL should be placed. */
13209 cxx_comdat_group (tree decl)
13213 /* Virtual tables, construction virtual tables, and virtual table
13214 tables all go in a single COMDAT group, named after the primary
13216 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
13217 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
13218 /* For all other DECLs, the COMDAT group is the mangled name of the
13219 declaration itself. */
13222 while (DECL_THUNK_P (decl))
13224 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
13225 into the same section as the target function. In that case
13226 we must return target's name. */
13227 tree target = THUNK_TARGET (decl);
13228 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
13229 && DECL_SECTION_NAME (target) != NULL
13230 && DECL_ONE_ONLY (target))
13235 name = DECL_ASSEMBLER_NAME (decl);
13241 #include "gt-cp-decl.h"