1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
58 static tree grokparms (tree parmlist, tree *);
59 static const char *redeclaration_error_message (tree, tree);
61 static int decl_jump_unsafe (tree);
62 static void require_complete_types_for_parms (tree);
63 static int ambi_op_p (enum tree_code);
64 static int unary_op_p (enum tree_code);
65 static void push_local_name (tree);
66 static tree grok_reference_init (tree, tree, tree, tree *);
67 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
69 static void record_unknown_type (tree, const char *);
70 static tree builtin_function_1 (tree, tree, bool);
71 static tree build_library_fn_1 (tree, enum tree_code, tree);
72 static int member_function_or_else (tree, tree, enum overload_flags);
73 static void bad_specifiers (tree, const char *, int, int, int, int,
75 static void check_for_uninitialized_const_var (tree);
76 static hashval_t typename_hash (const void *);
77 static int typename_compare (const void *, const void *);
78 static tree local_variable_p_walkfn (tree *, int *, void *);
79 static tree record_builtin_java_type (const char *, int);
80 static const char *tag_name (enum tag_types);
81 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
82 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
83 static void maybe_deduce_size_from_array_init (tree, tree);
84 static void layout_var_decl (tree);
85 static tree check_initializer (tree, tree, int, tree *);
86 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
87 static void save_function_data (tree);
88 static void check_function_type (tree, tree);
89 static void finish_constructor_body (void);
90 static void begin_destructor_body (void);
91 static void finish_destructor_body (void);
92 static tree create_array_type_for_decl (tree, tree, tree);
93 static tree get_atexit_node (void);
94 static tree get_dso_handle_node (void);
95 static tree start_cleanup_fn (void);
96 static void end_cleanup_fn (void);
97 static tree cp_make_fname_decl (location_t, tree, int);
98 static void initialize_predefined_identifiers (void);
99 static tree check_special_function_return_type
100 (special_function_kind, tree, tree);
101 static tree push_cp_library_fn (enum tree_code, tree);
102 static tree build_cp_library_fn (tree, enum tree_code, tree);
103 static void store_parm_decls (tree);
104 static void initialize_local_var (tree, tree);
105 static void expand_static_init (tree, tree);
106 static tree next_initializable_field (tree);
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
124 tree vtbl_ptr_type_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
137 The FUNCTION_DECL for the default `::operator delete'.
139 tree global_delete_fndecl;
142 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
143 tree tinfo_var_id; */
145 tree cp_global_trees[CPTI_MAX];
147 /* Indicates that there is a type value in some namespace, although
148 that is not necessarily in scope at the moment. */
150 tree global_type_node;
152 /* The node that holds the "name" of the global scope. */
153 tree global_scope_name;
155 #define local_names cp_function_chain->x_local_names
157 /* A list of objects which have constructors or destructors
158 which reside in the global scope. The decl is stored in
159 the TREE_VALUE slot and the initializer is stored
160 in the TREE_PURPOSE slot. */
161 tree static_aggregates;
165 /* A node for the integer constants 2, and 3. */
167 tree integer_two_node, integer_three_node;
169 /* Used only for jumps to as-yet undefined labels, since jumps to
170 defined labels can have their validity checked immediately. */
172 struct GTY(()) named_label_use_entry {
173 struct named_label_use_entry *next;
174 /* The binding level to which this entry is *currently* attached.
175 This is initially the binding level in which the goto appeared,
176 but is modified as scopes are closed. */
177 struct cp_binding_level *binding_level;
178 /* The head of the names list that was current when the goto appeared,
179 or the inner scope popped. These are the decls that will *not* be
180 skipped when jumping to the label. */
182 /* The location of the goto, for error reporting. */
183 location_t o_goto_locus;
184 /* True if an OpenMP structured block scope has been closed since
185 the goto appeared. This means that the branch from the label will
186 illegally exit an OpenMP scope. */
190 /* A list of all LABEL_DECLs in the function that have names. Here so
191 we can clear out their names' definitions at the end of the
192 function, and so we can check the validity of jumps to these labels. */
194 struct GTY(()) named_label_entry {
195 /* The decl itself. */
198 /* The binding level to which the label is *currently* attached.
199 This is initially set to the binding level in which the label
200 is defined, but is modified as scopes are closed. */
201 struct cp_binding_level *binding_level;
202 /* The head of the names list that was current when the label was
203 defined, or the inner scope popped. These are the decls that will
204 be skipped when jumping to the label. */
206 /* A tree list of all decls from all binding levels that would be
207 crossed by a backward branch to the label. */
210 /* A list of uses of the label, before the label is defined. */
211 struct named_label_use_entry *uses;
213 /* The following bits are set after the label is defined, and are
214 updated as scopes are popped. They indicate that a backward jump
215 to the label will illegally enter a scope of the given flavor. */
221 #define named_labels cp_function_chain->x_named_labels
223 /* The number of function bodies which we are currently processing.
224 (Zero if we are at namespace scope, one inside the body of a
225 function, two inside the body of a function in a local class, etc.) */
228 /* To avoid unwanted recursion, finish_function defers all mark_used calls
229 encountered during its execution until it finishes. */
230 bool defer_mark_used_calls;
231 VEC(tree, gc) *deferred_mark_used_calls;
233 /* States indicating how grokdeclarator() should handle declspecs marked
234 with __attribute__((deprecated)). An object declared as
235 __attribute__((deprecated)) suppresses warnings of uses of other
237 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
240 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
241 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
242 time the VAR_DECL was declared, the type was incomplete. */
244 static GTY(()) tree incomplete_vars;
246 /* Returns the kind of template specialization we are currently
247 processing, given that it's declaration contained N_CLASS_SCOPES
248 explicit scope qualifications. */
251 current_tmpl_spec_kind (int n_class_scopes)
253 int n_template_parm_scopes = 0;
254 int seen_specialization_p = 0;
255 int innermost_specialization_p = 0;
256 struct cp_binding_level *b;
258 /* Scan through the template parameter scopes. */
259 for (b = current_binding_level;
260 b->kind == sk_template_parms;
263 /* If we see a specialization scope inside a parameter scope,
264 then something is wrong. That corresponds to a declaration
267 template <class T> template <> ...
269 which is always invalid since [temp.expl.spec] forbids the
270 specialization of a class member template if the enclosing
271 class templates are not explicitly specialized as well. */
272 if (b->explicit_spec_p)
274 if (n_template_parm_scopes == 0)
275 innermost_specialization_p = 1;
277 seen_specialization_p = 1;
279 else if (seen_specialization_p == 1)
280 return tsk_invalid_member_spec;
282 ++n_template_parm_scopes;
285 /* Handle explicit instantiations. */
286 if (processing_explicit_instantiation)
288 if (n_template_parm_scopes != 0)
289 /* We've seen a template parameter list during an explicit
290 instantiation. For example:
292 template <class T> template void f(int);
294 This is erroneous. */
295 return tsk_invalid_expl_inst;
297 return tsk_expl_inst;
300 if (n_template_parm_scopes < n_class_scopes)
301 /* We've not seen enough template headers to match all the
302 specialized classes present. For example:
304 template <class T> void R<T>::S<T>::f(int);
306 This is invalid; there needs to be one set of template
307 parameters for each class. */
308 return tsk_insufficient_parms;
309 else if (n_template_parm_scopes == n_class_scopes)
310 /* We're processing a non-template declaration (even though it may
311 be a member of a template class.) For example:
313 template <class T> void S<T>::f(int);
315 The `class T' matches the `S<T>', leaving no template headers
316 corresponding to the `f'. */
318 else if (n_template_parm_scopes > n_class_scopes + 1)
319 /* We've got too many template headers. For example:
321 template <> template <class T> void f (T);
323 There need to be more enclosing classes. */
324 return tsk_excessive_parms;
326 /* This must be a template. It's of the form:
328 template <class T> template <class U> void S<T>::f(U);
330 This is a specialization if the innermost level was a
331 specialization; otherwise it's just a definition of the
333 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
336 /* Exit the current scope. */
344 /* When a label goes out of scope, check to see if that label was used
345 in a valid manner, and issue any appropriate warnings or errors. */
348 pop_label (tree label, tree old_value)
350 if (!processing_template_decl)
352 if (DECL_INITIAL (label) == NULL_TREE)
356 error ("label %q+D used but not defined", label);
357 location = input_location; /* FIXME want (input_filename, (line)0) */
358 /* Avoid crashing later. */
359 define_label (location, DECL_NAME (label));
362 warn_for_unused_label (label);
365 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
368 /* At the end of a function, all labels declared within the function
369 go out of scope. BLOCK is the top-level block for the
373 pop_labels_1 (void **slot, void *data)
375 struct named_label_entry *ent = (struct named_label_entry *) *slot;
376 tree block = (tree) data;
378 pop_label (ent->label_decl, NULL_TREE);
380 /* Put the labels into the "variables" of the top-level block,
381 so debugger can see them. */
382 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
383 BLOCK_VARS (block) = ent->label_decl;
385 htab_clear_slot (named_labels, slot);
391 pop_labels (tree block)
395 htab_traverse (named_labels, pop_labels_1, block);
400 /* At the end of a block with local labels, restore the outer definition. */
403 pop_local_label (tree label, tree old_value)
405 struct named_label_entry dummy;
408 pop_label (label, old_value);
410 dummy.label_decl = label;
411 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
412 htab_clear_slot (named_labels, slot);
415 /* The following two routines are used to interface to Objective-C++.
416 The binding level is purposely treated as an opaque type. */
419 objc_get_current_scope (void)
421 return current_binding_level;
424 /* The following routine is used by the NeXT-style SJLJ exceptions;
425 variables get marked 'volatile' so as to not be clobbered by
426 _setjmp()/_longjmp() calls. All variables in the current scope,
427 as well as parent scopes up to (but not including) ENCLOSING_BLK
428 shall be thusly marked. */
431 objc_mark_locals_volatile (void *enclosing_blk)
433 struct cp_binding_level *scope;
435 for (scope = current_binding_level;
436 scope && scope != enclosing_blk;
437 scope = scope->level_chain)
441 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
442 objc_volatilize_decl (decl);
444 /* Do not climb up past the current function. */
445 if (scope->kind == sk_function_parms)
450 /* Update data for defined and undefined labels when leaving a scope. */
453 poplevel_named_label_1 (void **slot, void *data)
455 struct named_label_entry *ent = (struct named_label_entry *) *slot;
456 struct cp_binding_level *bl = (struct cp_binding_level *) data;
457 struct cp_binding_level *obl = bl->level_chain;
459 if (ent->binding_level == bl)
463 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
464 if (decl_jump_unsafe (decl))
465 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
467 ent->binding_level = obl;
468 ent->names_in_scope = obl->names;
472 ent->in_try_scope = true;
475 ent->in_catch_scope = true;
478 ent->in_omp_scope = true;
486 struct named_label_use_entry *use;
488 for (use = ent->uses; use ; use = use->next)
489 if (use->binding_level == bl)
491 use->binding_level = obl;
492 use->names_in_scope = obl->names;
493 if (bl->kind == sk_omp)
494 use->in_omp_scope = true;
501 /* Exit a binding level.
502 Pop the level off, and restore the state of the identifier-decl mappings
503 that were in effect when this level was entered.
505 If KEEP == 1, this level had explicit declarations, so
506 and create a "block" (a BLOCK node) for the level
507 to record its declarations and subblocks for symbol table output.
509 If FUNCTIONBODY is nonzero, this level is the body of a function,
510 so create a block as if KEEP were set and also clear out all
513 If REVERSE is nonzero, reverse the order of decls before putting
514 them into the BLOCK. */
517 poplevel (int keep, int reverse, int functionbody)
520 /* The chain of decls was accumulated in reverse order.
521 Put it into forward order, just for cleanliness. */
523 int tmp = functionbody;
524 int real_functionbody;
528 int leaving_for_scope;
531 timevar_push (TV_NAME_LOOKUP);
536 gcc_assert (current_binding_level->kind != sk_class);
538 real_functionbody = (current_binding_level->kind == sk_cleanup
539 ? ((functionbody = 0), tmp) : functionbody);
540 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
542 gcc_assert (!VEC_length(cp_class_binding,
543 current_binding_level->class_shadowed));
545 /* We used to use KEEP == 2 to indicate that the new block should go
546 at the beginning of the list of blocks at this binding level,
547 rather than the end. This hack is no longer used. */
548 gcc_assert (keep == 0 || keep == 1);
550 if (current_binding_level->keep)
553 /* Any uses of undefined labels, and any defined labels, now operate
554 under constraints of next binding contour. */
555 if (cfun && !functionbody && named_labels)
556 htab_traverse (named_labels, poplevel_named_label_1,
557 current_binding_level);
559 /* Get the decls in the order they were written.
560 Usually current_binding_level->names is in reverse order.
561 But parameter decls were previously put in forward order. */
564 current_binding_level->names
565 = decls = nreverse (current_binding_level->names);
567 decls = current_binding_level->names;
569 /* If there were any declarations or structure tags in that level,
570 or if this level is a function body,
571 create a BLOCK to record them for the life of this function. */
573 if (keep == 1 || functionbody)
574 block = make_node (BLOCK);
575 if (block != NULL_TREE)
577 BLOCK_VARS (block) = decls;
578 BLOCK_SUBBLOCKS (block) = subblocks;
581 /* In each subblock, record that this is its superior. */
583 for (link = subblocks; link; link = BLOCK_CHAIN (link))
584 BLOCK_SUPERCONTEXT (link) = block;
586 /* We still support the old for-scope rules, whereby the variables
587 in a for-init statement were in scope after the for-statement
588 ended. We only use the new rules if flag_new_for_scope is
591 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
593 /* Before we remove the declarations first check for unused variables. */
594 if (warn_unused_variable
595 && !processing_template_decl)
596 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
597 if (TREE_CODE (decl) == VAR_DECL
598 && ! TREE_USED (decl)
599 && ! DECL_IN_SYSTEM_HEADER (decl)
600 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
601 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
603 /* Remove declarations for all the DECLs in this level. */
604 for (link = decls; link; link = TREE_CHAIN (link))
606 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
609 tree name = DECL_NAME (link);
613 ob = outer_binding (name,
614 IDENTIFIER_BINDING (name),
617 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
619 ns_binding = NULL_TREE;
621 if (ob && ob->scope == current_binding_level->level_chain)
622 /* We have something like:
627 and we are leaving the `for' scope. There's no reason to
628 keep the binding of the inner `i' in this case. */
629 pop_binding (name, link);
630 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
631 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
632 /* Here, we have something like:
640 We must pop the for-scope binding so we know what's a
641 type and what isn't. */
642 pop_binding (name, link);
645 /* Mark this VAR_DECL as dead so that we can tell we left it
646 there only for backward compatibility. */
647 DECL_DEAD_FOR_LOCAL (link) = 1;
649 /* Keep track of what should have happened when we
650 popped the binding. */
653 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
654 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
657 /* Add it to the list of dead variables in the next
658 outermost binding to that we can remove these when we
659 leave that binding. */
660 current_binding_level->level_chain->dead_vars_from_for
661 = tree_cons (NULL_TREE, link,
662 current_binding_level->level_chain->
665 /* Although we don't pop the cxx_binding, we do clear
666 its SCOPE since the scope is going away now. */
667 IDENTIFIER_BINDING (name)->scope
668 = current_binding_level->level_chain;
675 /* Remove the binding. */
678 if (TREE_CODE (decl) == TREE_LIST)
679 decl = TREE_VALUE (decl);
682 if (TREE_CODE (name) == OVERLOAD)
683 name = OVL_FUNCTION (name);
685 gcc_assert (DECL_P (name));
686 pop_binding (DECL_NAME (name), decl);
690 /* Remove declarations for any `for' variables from inner scopes
691 that we kept around. */
692 for (link = current_binding_level->dead_vars_from_for;
693 link; link = TREE_CHAIN (link))
694 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
696 /* Restore the IDENTIFIER_TYPE_VALUEs. */
697 for (link = current_binding_level->type_shadowed;
698 link; link = TREE_CHAIN (link))
699 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
701 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
702 for (link = current_binding_level->shadowed_labels;
704 link = TREE_CHAIN (link))
705 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
707 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
708 list if a `using' declaration put them there. The debugging
709 back ends won't understand OVERLOAD, so we remove them here.
710 Because the BLOCK_VARS are (temporarily) shared with
711 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
712 popped all the bindings. */
717 for (d = &BLOCK_VARS (block); *d; )
719 if (TREE_CODE (*d) == TREE_LIST)
720 *d = TREE_CHAIN (*d);
722 d = &TREE_CHAIN (*d);
726 /* If the level being exited is the top level of a function,
727 check over all the labels. */
730 /* Since this is the top level block of a function, the vars are
731 the function's parameters. Don't leave them in the BLOCK
732 because they are found in the FUNCTION_DECL instead. */
733 BLOCK_VARS (block) = 0;
737 kind = current_binding_level->kind;
738 if (kind == sk_cleanup)
742 /* If this is a temporary binding created for a cleanup, then we'll
743 have pushed a statement list level. Pop that, create a new
744 BIND_EXPR for the block, and insert it into the stream. */
745 stmt = pop_stmt_list (current_binding_level->statement_list);
746 stmt = c_build_bind_expr (input_location, block, stmt);
753 /* The current function is being defined, so its DECL_INITIAL
754 should be error_mark_node. */
755 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
756 DECL_INITIAL (current_function_decl) = block;
759 current_binding_level->blocks
760 = chainon (current_binding_level->blocks, block);
762 /* If we did not make a block for the level just exited,
763 any blocks made for inner levels
764 (since they cannot be recorded as subblocks in that level)
765 must be carried forward so they will later become subblocks
766 of something else. */
768 current_binding_level->blocks
769 = chainon (current_binding_level->blocks, subblocks);
771 /* Each and every BLOCK node created here in `poplevel' is important
772 (e.g. for proper debugging information) so if we created one
773 earlier, mark it as "used". */
775 TREE_USED (block) = 1;
777 /* All temporary bindings created for cleanups are popped silently. */
778 if (kind == sk_cleanup)
781 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
784 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
785 itself, calling F for each. The DATA is passed to F as well. */
788 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
791 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
793 result |= (*f) (name_space, data);
795 for (; current; current = TREE_CHAIN (current))
796 result |= walk_namespaces_r (current, f, data);
801 /* Walk all the namespaces, calling F for each. The DATA is passed to
805 walk_namespaces (walk_namespaces_fn f, void* data)
807 return walk_namespaces_r (global_namespace, f, data);
810 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
811 DATA is non-NULL, this is the last time we will call
812 wrapup_global_declarations for this NAMESPACE. */
815 wrapup_globals_for_namespace (tree name_space, void* data)
817 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
818 VEC(tree,gc) *statics = level->static_decls;
819 tree *vec = VEC_address (tree, statics);
820 int len = VEC_length (tree, statics);
821 int last_time = (data != 0);
825 check_global_declarations (vec, len);
826 emit_debug_global_declarations (vec, len);
830 /* Write out any globals that need to be output. */
831 return wrapup_global_declarations (vec, len);
835 /* In C++, you don't have to write `struct S' to refer to `S'; you
836 can just use `S'. We accomplish this by creating a TYPE_DECL as
837 if the user had written `typedef struct S S'. Create and return
838 the TYPE_DECL for TYPE. */
841 create_implicit_typedef (tree name, tree type)
845 decl = build_decl (input_location, TYPE_DECL, name, type);
846 DECL_ARTIFICIAL (decl) = 1;
847 /* There are other implicit type declarations, like the one *within*
848 a class that allows you to write `S::S'. We must distinguish
850 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
851 TYPE_NAME (type) = decl;
856 /* Remember a local name for name-mangling purposes. */
859 push_local_name (tree decl)
864 timevar_push (TV_NAME_LOOKUP);
866 name = DECL_NAME (decl);
868 nelts = VEC_length (tree, local_names);
869 for (i = 0; i < nelts; i++)
871 t = VEC_index (tree, local_names, i);
872 if (DECL_NAME (t) == name)
874 if (!DECL_LANG_SPECIFIC (decl))
875 retrofit_lang_decl (decl);
876 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
877 if (DECL_LANG_SPECIFIC (t))
878 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
880 DECL_DISCRIMINATOR (decl) = 1;
882 VEC_replace (tree, local_names, i, decl);
883 timevar_pop (TV_NAME_LOOKUP);
888 VEC_safe_push (tree, gc, local_names, decl);
889 timevar_pop (TV_NAME_LOOKUP);
892 /* Subroutine of duplicate_decls: return truthvalue of whether
893 or not types of these decls match.
895 For C++, we must compare the parameter list so that `int' can match
896 `int&' in a parameter position, but `int&' is not confused with
900 decls_match (tree newdecl, tree olddecl)
904 if (newdecl == olddecl)
907 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
908 /* If the two DECLs are not even the same kind of thing, we're not
909 interested in their types. */
912 if (TREE_CODE (newdecl) == FUNCTION_DECL)
914 tree f1 = TREE_TYPE (newdecl);
915 tree f2 = TREE_TYPE (olddecl);
916 tree p1 = TYPE_ARG_TYPES (f1);
917 tree p2 = TYPE_ARG_TYPES (f2);
919 /* Specializations of different templates are different functions
920 even if they have the same type. */
921 tree t1 = (DECL_USE_TEMPLATE (newdecl)
922 ? DECL_TI_TEMPLATE (newdecl)
924 tree t2 = (DECL_USE_TEMPLATE (olddecl)
925 ? DECL_TI_TEMPLATE (olddecl)
930 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
931 && ! (DECL_EXTERN_C_P (newdecl)
932 && DECL_EXTERN_C_P (olddecl)))
935 #ifdef NO_IMPLICIT_EXTERN_C
936 /* A new declaration doesn't match a built-in one unless it
937 is also extern "C". */
938 if (DECL_IS_BUILTIN (olddecl)
939 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
943 if (TREE_CODE (f1) != TREE_CODE (f2))
946 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
948 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
949 && (DECL_BUILT_IN (olddecl)
950 #ifndef NO_IMPLICIT_EXTERN_C
951 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
952 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
956 types_match = self_promoting_args_p (p1);
957 if (p1 == void_list_node)
958 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
960 #ifndef NO_IMPLICIT_EXTERN_C
961 else if (p1 == NULL_TREE
962 && (DECL_EXTERN_C_P (olddecl)
963 && DECL_IN_SYSTEM_HEADER (olddecl)
964 && !DECL_CLASS_SCOPE_P (olddecl))
965 && (DECL_EXTERN_C_P (newdecl)
966 && DECL_IN_SYSTEM_HEADER (newdecl)
967 && !DECL_CLASS_SCOPE_P (newdecl)))
969 types_match = self_promoting_args_p (p2);
970 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
974 types_match = compparms (p1, p2);
979 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
981 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
982 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
985 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
986 DECL_TEMPLATE_PARMS (olddecl)))
989 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
990 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
991 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
993 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
994 DECL_TEMPLATE_RESULT (newdecl));
998 /* Need to check scope for variable declaration (VAR_DECL).
999 For typedef (TYPE_DECL), scope is ignored. */
1000 if (TREE_CODE (newdecl) == VAR_DECL
1001 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1003 Two declarations for an object with C language linkage
1004 with the same name (ignoring the namespace that qualify
1005 it) that appear in different namespace scopes refer to
1007 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1010 if (TREE_TYPE (newdecl) == error_mark_node)
1011 types_match = TREE_TYPE (olddecl) == error_mark_node;
1012 else if (TREE_TYPE (olddecl) == NULL_TREE)
1013 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1014 else if (TREE_TYPE (newdecl) == NULL_TREE)
1017 types_match = comptypes (TREE_TYPE (newdecl),
1018 TREE_TYPE (olddecl),
1019 COMPARE_REDECLARATION);
1025 /* If NEWDECL is `static' and an `extern' was seen previously,
1026 warn about it. OLDDECL is the previous declaration.
1028 Note that this does not apply to the C++ case of declaring
1029 a variable `extern const' and then later `const'.
1031 Don't complain about built-in functions, since they are beyond
1032 the user's control. */
1035 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1039 if (TREE_CODE (newdecl) == TYPE_DECL
1040 || TREE_CODE (newdecl) == TEMPLATE_DECL
1041 || TREE_CODE (newdecl) == CONST_DECL
1042 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1045 /* Don't get confused by static member functions; that's a different
1047 if (TREE_CODE (newdecl) == FUNCTION_DECL
1048 && DECL_STATIC_FUNCTION_P (newdecl))
1051 /* If the old declaration was `static', or the new one isn't, then
1052 then everything is OK. */
1053 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1056 /* It's OK to declare a builtin function as `static'. */
1057 if (TREE_CODE (olddecl) == FUNCTION_DECL
1058 && DECL_ARTIFICIAL (olddecl))
1061 name = DECL_ASSEMBLER_NAME (newdecl);
1062 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1063 permerror (input_location, "previous declaration of %q+D", olddecl);
1066 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1067 function templates. If their exception specifications do not
1068 match, issue a diagnostic. */
1071 check_redeclaration_exception_specification (tree new_decl,
1076 tree new_exceptions;
1077 tree old_exceptions;
1079 new_type = TREE_TYPE (new_decl);
1080 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1081 old_type = TREE_TYPE (old_decl);
1082 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1086 If any declaration of a function has an exception-specification,
1087 all declarations, including the definition and an explicit
1088 specialization, of that function shall have an
1089 exception-specification with the same set of type-ids. */
1090 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1091 && ! DECL_IS_BUILTIN (old_decl)
1093 && !comp_except_specs (new_exceptions, old_exceptions,
1096 error ("declaration of %qF throws different exceptions", new_decl);
1097 error ("from previous declaration %q+F", old_decl);
1101 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1102 && lookup_attribute ("gnu_inline", \
1103 DECL_ATTRIBUTES (fn)))
1105 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1106 If the redeclaration is invalid, a diagnostic is issued, and the
1107 error_mark_node is returned. Otherwise, OLDDECL is returned.
1109 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1112 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1115 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1117 unsigned olddecl_uid = DECL_UID (olddecl);
1118 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1119 int new_defines_function = 0;
1120 tree new_template_info;
1122 if (newdecl == olddecl)
1125 types_match = decls_match (newdecl, olddecl);
1127 /* If either the type of the new decl or the type of the old decl is an
1128 error_mark_node, then that implies that we have already issued an
1129 error (earlier) for some bogus type specification, and in that case,
1130 it is rather pointless to harass the user with yet more error message
1131 about the same declaration, so just pretend the types match here. */
1132 if (TREE_TYPE (newdecl) == error_mark_node
1133 || TREE_TYPE (olddecl) == error_mark_node)
1134 return error_mark_node;
1136 if (DECL_P (olddecl)
1137 && TREE_CODE (newdecl) == FUNCTION_DECL
1138 && TREE_CODE (olddecl) == FUNCTION_DECL
1139 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1141 if (DECL_DECLARED_INLINE_P (newdecl)
1142 && DECL_UNINLINABLE (newdecl)
1143 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1144 /* Already warned elsewhere. */;
1145 else if (DECL_DECLARED_INLINE_P (olddecl)
1146 && DECL_UNINLINABLE (olddecl)
1147 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1148 /* Already warned. */;
1149 else if (DECL_DECLARED_INLINE_P (newdecl)
1150 && DECL_UNINLINABLE (olddecl)
1151 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1153 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1155 warning (OPT_Wattributes, "previous declaration of %q+D "
1156 "with attribute noinline", olddecl);
1158 else if (DECL_DECLARED_INLINE_P (olddecl)
1159 && DECL_UNINLINABLE (newdecl)
1160 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1162 warning (OPT_Wattributes, "function %q+D redeclared with "
1163 "attribute noinline", newdecl);
1164 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1169 /* Check for redeclaration and other discrepancies. */
1170 if (TREE_CODE (olddecl) == FUNCTION_DECL
1171 && DECL_ARTIFICIAL (olddecl))
1173 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1174 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1176 /* Avoid warnings redeclaring built-ins which have not been
1177 explicitly declared. */
1178 if (DECL_ANTICIPATED (olddecl))
1181 /* If you declare a built-in or predefined function name as static,
1182 the old definition is overridden, but optionally warn this was a
1183 bad choice of name. */
1184 if (! TREE_PUBLIC (newdecl))
1186 warning (OPT_Wshadow, "shadowing %s function %q#D",
1187 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1189 /* Discard the old built-in function. */
1192 /* If the built-in is not ansi, then programs can override
1193 it even globally without an error. */
1194 else if (! DECL_BUILT_IN (olddecl))
1195 warning (0, "library function %q#D redeclared as non-function %q#D",
1199 error ("declaration of %q#D", newdecl);
1200 error ("conflicts with built-in declaration %q#D",
1205 else if (!types_match)
1207 /* Avoid warnings redeclaring built-ins which have not been
1208 explicitly declared. */
1209 if (DECL_ANTICIPATED (olddecl))
1211 /* Deal with fileptr_type_node. FILE type is not known
1212 at the time we create the builtins. */
1215 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1216 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1218 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1221 else if (TREE_VALUE (t2) == fileptr_type_node)
1223 tree t = TREE_VALUE (t1);
1225 if (TREE_CODE (t) == POINTER_TYPE
1226 && TYPE_NAME (TREE_TYPE (t))
1227 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1228 == get_identifier ("FILE")
1229 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1231 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1233 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1234 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1235 types_match = decls_match (newdecl, olddecl);
1237 return duplicate_decls (newdecl, olddecl,
1239 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1242 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1245 else if ((DECL_EXTERN_C_P (newdecl)
1246 && DECL_EXTERN_C_P (olddecl))
1247 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1248 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1250 /* A near match; override the builtin. */
1252 if (TREE_PUBLIC (newdecl))
1254 warning (0, "new declaration %q#D", newdecl);
1255 warning (0, "ambiguates built-in declaration %q#D",
1259 warning (OPT_Wshadow, "shadowing %s function %q#D",
1260 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1264 /* Discard the old built-in function. */
1267 /* Replace the old RTL to avoid problems with inlining. */
1268 COPY_DECL_RTL (newdecl, olddecl);
1270 /* Even if the types match, prefer the new declarations type for
1271 built-ins which have not been explicitly declared, for
1272 exception lists, etc... */
1273 else if (DECL_ANTICIPATED (olddecl))
1275 tree type = TREE_TYPE (newdecl);
1276 tree attribs = (*targetm.merge_type_attributes)
1277 (TREE_TYPE (olddecl), type);
1279 type = cp_build_type_attribute_variant (type, attribs);
1280 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1283 /* If a function is explicitly declared "throw ()", propagate that to
1284 the corresponding builtin. */
1285 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1286 && DECL_ANTICIPATED (olddecl)
1287 && TREE_NOTHROW (newdecl)
1288 && !TREE_NOTHROW (olddecl)
1289 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1290 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1292 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1294 /* Whether or not the builtin can throw exceptions has no
1295 bearing on this declarator. */
1296 TREE_NOTHROW (olddecl) = 0;
1298 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1300 /* If a builtin function is redeclared as `static', merge
1301 the declarations, but make the original one static. */
1302 DECL_THIS_STATIC (olddecl) = 1;
1303 TREE_PUBLIC (olddecl) = 0;
1305 /* Make the old declaration consistent with the new one so
1306 that all remnants of the builtin-ness of this function
1307 will be banished. */
1308 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1309 COPY_DECL_RTL (newdecl, olddecl);
1312 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1314 /* C++ Standard, 3.3, clause 4:
1315 "[Note: a namespace name or a class template name must be unique
1316 in its declarative region (7.3.2, clause 14). ]" */
1317 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1318 && TREE_CODE (newdecl) != NAMESPACE_DECL
1319 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1320 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1321 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1322 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1324 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1325 && TREE_CODE (newdecl) != TYPE_DECL)
1326 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1327 && TREE_CODE (olddecl) != TYPE_DECL))
1329 /* We do nothing special here, because C++ does such nasty
1330 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1331 get shadowed, and know that if we need to find a TYPE_DECL
1332 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1333 slot of the identifier. */
1337 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1338 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1339 || (TREE_CODE (olddecl) == FUNCTION_DECL
1340 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1344 error ("%q#D redeclared as different kind of symbol", newdecl);
1345 if (TREE_CODE (olddecl) == TREE_LIST)
1346 olddecl = TREE_VALUE (olddecl);
1347 error ("previous declaration of %q+#D", olddecl);
1349 return error_mark_node;
1351 else if (!types_match)
1353 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1354 /* These are certainly not duplicate declarations; they're
1355 from different scopes. */
1358 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1360 /* The name of a class template may not be declared to refer to
1361 any other template, class, function, object, namespace, value,
1362 or type in the same scope. */
1363 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1364 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1366 error ("declaration of template %q#D", newdecl);
1367 error ("conflicts with previous declaration %q+#D", olddecl);
1369 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1370 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1371 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1372 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1373 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1374 DECL_TEMPLATE_PARMS (olddecl))
1375 /* Template functions can be disambiguated by
1377 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1378 TREE_TYPE (TREE_TYPE (olddecl))))
1380 error ("new declaration %q#D", newdecl);
1381 error ("ambiguates old declaration %q+#D", olddecl);
1385 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1387 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1389 error ("declaration of C function %q#D conflicts with",
1391 error ("previous declaration %q+#D here", olddecl);
1393 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1394 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1396 error ("new declaration %q#D", newdecl);
1397 error ("ambiguates old declaration %q+#D", olddecl);
1398 return error_mark_node;
1405 error ("conflicting declaration %q#D", newdecl);
1406 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1407 return error_mark_node;
1410 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1411 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1412 && (!DECL_TEMPLATE_INFO (newdecl)
1413 || (DECL_TI_TEMPLATE (newdecl)
1414 != DECL_TI_TEMPLATE (olddecl))))
1415 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1416 && (!DECL_TEMPLATE_INFO (olddecl)
1417 || (DECL_TI_TEMPLATE (olddecl)
1418 != DECL_TI_TEMPLATE (newdecl))))))
1419 /* It's OK to have a template specialization and a non-template
1420 with the same type, or to have specializations of two
1421 different templates with the same type. Note that if one is a
1422 specialization, and the other is an instantiation of the same
1423 template, that we do not exit at this point. That situation
1424 can occur if we instantiate a template class, and then
1425 specialize one of its methods. This situation is valid, but
1426 the declarations must be merged in the usual way. */
1428 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1429 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1430 && !DECL_USE_TEMPLATE (newdecl))
1431 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1432 && !DECL_USE_TEMPLATE (olddecl))))
1433 /* One of the declarations is a template instantiation, and the
1434 other is not a template at all. That's OK. */
1436 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1438 /* In [namespace.alias] we have:
1440 In a declarative region, a namespace-alias-definition can be
1441 used to redefine a namespace-alias declared in that declarative
1442 region to refer only to the namespace to which it already
1445 Therefore, if we encounter a second alias directive for the same
1446 alias, we can just ignore the second directive. */
1447 if (DECL_NAMESPACE_ALIAS (newdecl)
1448 && (DECL_NAMESPACE_ALIAS (newdecl)
1449 == DECL_NAMESPACE_ALIAS (olddecl)))
1451 /* [namespace.alias]
1453 A namespace-name or namespace-alias shall not be declared as
1454 the name of any other entity in the same declarative region.
1455 A namespace-name defined at global scope shall not be
1456 declared as the name of any other entity in any global scope
1458 error ("declaration of namespace %qD conflicts with", newdecl);
1459 error ("previous declaration of namespace %q+D here", olddecl);
1460 return error_mark_node;
1464 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1467 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1468 if (DECL_NAME (olddecl) != NULL_TREE)
1469 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1470 ? "%q+#D previously defined here"
1471 : "%q+#D previously declared here", olddecl);
1472 return error_mark_node;
1474 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1475 && DECL_INITIAL (olddecl) != NULL_TREE
1476 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1477 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1479 /* Prototype decl follows defn w/o prototype. */
1480 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1481 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1482 "follows non-prototype definition here");
1484 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1485 || TREE_CODE (olddecl) == VAR_DECL)
1486 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1489 If two declarations of the same function or object
1490 specify different linkage-specifications ..., the program
1491 is ill-formed.... Except for functions with C++ linkage,
1492 a function declaration without a linkage specification
1493 shall not precede the first linkage specification for
1494 that function. A function can be declared without a
1495 linkage specification after an explicit linkage
1496 specification has been seen; the linkage explicitly
1497 specified in the earlier declaration is not affected by
1498 such a function declaration.
1500 DR 563 raises the question why the restrictions on
1501 functions should not also apply to objects. Older
1502 versions of G++ silently ignore the linkage-specification
1510 which is clearly wrong. Therefore, we now treat objects
1512 if (current_lang_depth () == 0)
1514 /* There is no explicit linkage-specification, so we use
1515 the linkage from the previous declaration. */
1516 if (!DECL_LANG_SPECIFIC (newdecl))
1517 retrofit_lang_decl (newdecl);
1518 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1522 error ("previous declaration of %q+#D with %qL linkage",
1523 olddecl, DECL_LANGUAGE (olddecl));
1524 error ("conflicts with new declaration with %qL linkage",
1525 DECL_LANGUAGE (newdecl));
1529 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1531 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1533 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1534 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1537 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1538 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1540 for (; t1 && t1 != void_list_node;
1541 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1542 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1544 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1547 permerror (input_location, "default argument given for parameter %d of %q#D",
1549 permerror (input_location, "after previous specification in %q+#D", olddecl);
1553 error ("default argument given for parameter %d of %q#D",
1555 error ("after previous specification in %q+#D",
1562 /* Do not merge an implicit typedef with an explicit one. In:
1566 typedef class A A __attribute__ ((foo));
1568 the attribute should apply only to the typedef. */
1569 if (TREE_CODE (olddecl) == TYPE_DECL
1570 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1571 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1574 /* If new decl is `static' and an `extern' was seen previously,
1576 warn_extern_redeclared_static (newdecl, olddecl);
1578 /* We have committed to returning 1 at this point. */
1579 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1581 /* Now that functions must hold information normally held
1582 by field decls, there is extra work to do so that
1583 declaration information does not get destroyed during
1585 if (DECL_VINDEX (olddecl))
1586 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1587 if (DECL_CONTEXT (olddecl))
1588 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1589 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1590 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1591 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1592 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1593 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1594 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1595 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1596 SET_OVERLOADED_OPERATOR_CODE
1597 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1598 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1600 /* Optionally warn about more than one declaration for the same
1601 name, but don't warn about a function declaration followed by a
1603 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1604 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1605 /* Don't warn about extern decl followed by definition. */
1606 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1607 /* Don't warn about friends, let add_friend take care of it. */
1608 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1610 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1611 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1614 if (DECL_DELETED_FN (newdecl))
1616 error ("deleted definition of %qD", newdecl);
1617 error ("after previous declaration %q+D", olddecl);
1621 /* Deal with C++: must preserve virtual function table size. */
1622 if (TREE_CODE (olddecl) == TYPE_DECL)
1624 tree newtype = TREE_TYPE (newdecl);
1625 tree oldtype = TREE_TYPE (olddecl);
1627 if (newtype != error_mark_node && oldtype != error_mark_node
1628 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1629 CLASSTYPE_FRIEND_CLASSES (newtype)
1630 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1632 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1635 /* Copy all the DECL_... slots specified in the new decl
1636 except for any that we copy here from the old type. */
1637 DECL_ATTRIBUTES (newdecl)
1638 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1640 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1644 old_result = DECL_TEMPLATE_RESULT (olddecl);
1645 new_result = DECL_TEMPLATE_RESULT (newdecl);
1646 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1647 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1648 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1649 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1651 DECL_ATTRIBUTES (old_result)
1652 = (*targetm.merge_decl_attributes) (old_result, new_result);
1654 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1656 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1657 && DECL_INITIAL (new_result))
1659 if (DECL_INITIAL (old_result))
1660 DECL_UNINLINABLE (old_result) = 1;
1662 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1663 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1664 DECL_NOT_REALLY_EXTERN (old_result)
1665 = DECL_NOT_REALLY_EXTERN (new_result);
1666 DECL_INTERFACE_KNOWN (old_result)
1667 = DECL_INTERFACE_KNOWN (new_result);
1668 DECL_DECLARED_INLINE_P (old_result)
1669 = DECL_DECLARED_INLINE_P (new_result);
1670 DECL_DISREGARD_INLINE_LIMITS (old_result)
1671 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1676 DECL_DECLARED_INLINE_P (old_result)
1677 |= DECL_DECLARED_INLINE_P (new_result);
1678 DECL_DISREGARD_INLINE_LIMITS (old_result)
1679 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1680 check_redeclaration_exception_specification (newdecl, olddecl);
1684 /* If the new declaration is a definition, update the file and
1685 line information on the declaration, and also make
1686 the old declaration the same definition. */
1687 if (DECL_INITIAL (new_result) != NULL_TREE)
1689 DECL_SOURCE_LOCATION (olddecl)
1690 = DECL_SOURCE_LOCATION (old_result)
1691 = DECL_SOURCE_LOCATION (newdecl);
1692 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1693 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1696 DECL_ARGUMENTS (old_result)
1697 = DECL_ARGUMENTS (new_result);
1698 for (parm = DECL_ARGUMENTS (old_result); parm;
1699 parm = TREE_CHAIN (parm))
1700 DECL_CONTEXT (parm) = old_result;
1709 /* Automatically handles default parameters. */
1710 tree oldtype = TREE_TYPE (olddecl);
1713 /* Merge the data types specified in the two decls. */
1714 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1716 /* If merge_types produces a non-typedef type, just use the old type. */
1717 if (TREE_CODE (newdecl) == TYPE_DECL
1718 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1721 if (TREE_CODE (newdecl) == VAR_DECL)
1723 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1724 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1725 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1726 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1727 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1728 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1730 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1731 if (DECL_LANG_SPECIFIC (olddecl)
1732 && CP_DECL_THREADPRIVATE_P (olddecl))
1734 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1735 if (!DECL_LANG_SPECIFIC (newdecl))
1736 retrofit_lang_decl (newdecl);
1738 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1739 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1743 /* Do this after calling `merge_types' so that default
1744 parameters don't confuse us. */
1745 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1746 check_redeclaration_exception_specification (newdecl, olddecl);
1747 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1749 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1750 check_default_args (newdecl);
1752 /* Lay the type out, unless already done. */
1753 if (! same_type_p (newtype, oldtype)
1754 && TREE_TYPE (newdecl) != error_mark_node
1755 && !(processing_template_decl && uses_template_parms (newdecl)))
1756 layout_type (TREE_TYPE (newdecl));
1758 if ((TREE_CODE (newdecl) == VAR_DECL
1759 || TREE_CODE (newdecl) == PARM_DECL
1760 || TREE_CODE (newdecl) == RESULT_DECL
1761 || TREE_CODE (newdecl) == FIELD_DECL
1762 || TREE_CODE (newdecl) == TYPE_DECL)
1763 && !(processing_template_decl && uses_template_parms (newdecl)))
1764 layout_decl (newdecl, 0);
1766 /* Merge the type qualifiers. */
1767 if (TREE_READONLY (newdecl))
1768 TREE_READONLY (olddecl) = 1;
1769 if (TREE_THIS_VOLATILE (newdecl))
1770 TREE_THIS_VOLATILE (olddecl) = 1;
1771 if (TREE_NOTHROW (newdecl))
1772 TREE_NOTHROW (olddecl) = 1;
1774 /* Merge deprecatedness. */
1775 if (TREE_DEPRECATED (newdecl))
1776 TREE_DEPRECATED (olddecl) = 1;
1778 /* Preserve function specific target and optimization options */
1779 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1781 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1782 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1783 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1784 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1786 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1787 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1788 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1789 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1792 /* Merge the initialization information. */
1793 if (DECL_INITIAL (newdecl) == NULL_TREE
1794 && DECL_INITIAL (olddecl) != NULL_TREE)
1796 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1797 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1798 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1800 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1801 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1805 /* Merge the section attribute.
1806 We want to issue an error if the sections conflict but that must be
1807 done later in decl_attributes since we are called before attributes
1809 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1810 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1812 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1814 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1815 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1816 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1817 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1818 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1819 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1820 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1821 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1822 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1823 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1824 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1825 /* Keep the old RTL. */
1826 COPY_DECL_RTL (olddecl, newdecl);
1828 else if (TREE_CODE (newdecl) == VAR_DECL
1829 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1831 /* Keep the old RTL. We cannot keep the old RTL if the old
1832 declaration was for an incomplete object and the new
1833 declaration is not since many attributes of the RTL will
1835 COPY_DECL_RTL (olddecl, newdecl);
1838 /* If cannot merge, then use the new type and qualifiers,
1839 and don't preserve the old rtl. */
1842 /* Clean out any memory we had of the old declaration. */
1843 tree oldstatic = value_member (olddecl, static_aggregates);
1845 TREE_VALUE (oldstatic) = error_mark_node;
1847 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1848 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1849 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1850 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1853 /* Merge the storage class information. */
1854 merge_weak (newdecl, olddecl);
1856 if (DECL_ONE_ONLY (olddecl))
1857 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1859 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1860 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1861 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1862 if (! DECL_EXTERNAL (olddecl))
1863 DECL_EXTERNAL (newdecl) = 0;
1865 new_template_info = NULL_TREE;
1866 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1868 bool new_redefines_gnu_inline = false;
1870 if (new_defines_function
1871 && ((DECL_INTERFACE_KNOWN (olddecl)
1872 && TREE_CODE (olddecl) == FUNCTION_DECL)
1873 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1874 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1875 == FUNCTION_DECL))))
1879 if (TREE_CODE (fn) == TEMPLATE_DECL)
1880 fn = DECL_TEMPLATE_RESULT (olddecl);
1882 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1885 if (!new_redefines_gnu_inline)
1887 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1888 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1889 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1891 DECL_TEMPLATE_INSTANTIATED (newdecl)
1892 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1893 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1895 /* If the OLDDECL is an instantiation and/or specialization,
1896 then the NEWDECL must be too. But, it may not yet be marked
1897 as such if the caller has created NEWDECL, but has not yet
1898 figured out that it is a redeclaration. */
1899 if (!DECL_USE_TEMPLATE (newdecl))
1900 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1902 /* Don't really know how much of the language-specific
1903 values we should copy from old to new. */
1904 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1905 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1906 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1907 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1909 if (LANG_DECL_HAS_MIN (newdecl))
1911 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1912 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1913 if (DECL_TEMPLATE_INFO (newdecl))
1914 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1915 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1917 /* Only functions have these fields. */
1918 if (TREE_CODE (newdecl) == FUNCTION_DECL
1919 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1921 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1922 olddecl_friend = DECL_FRIEND_P (olddecl);
1923 hidden_friend = (DECL_ANTICIPATED (olddecl)
1924 && DECL_HIDDEN_FRIEND_P (olddecl)
1925 && newdecl_is_friend);
1926 DECL_BEFRIENDING_CLASSES (newdecl)
1927 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1928 DECL_BEFRIENDING_CLASSES (olddecl));
1929 /* DECL_THUNKS is only valid for virtual functions,
1930 otherwise it is a DECL_FRIEND_CONTEXT. */
1931 if (DECL_VIRTUAL_P (newdecl))
1932 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1936 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1940 /* Merge parameter attributes. */
1941 tree oldarg, newarg;
1942 for (oldarg = DECL_ARGUMENTS(olddecl),
1943 newarg = DECL_ARGUMENTS(newdecl);
1945 oldarg = TREE_CHAIN(oldarg), newarg = TREE_CHAIN(newarg)) {
1946 DECL_ATTRIBUTES (newarg)
1947 = (*targetm.merge_decl_attributes) (oldarg, newarg);
1948 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
1951 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1952 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1954 /* If newdecl is not a specialization, then it is not a
1955 template-related function at all. And that means that we
1956 should have exited above, returning 0. */
1957 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1959 if (DECL_ODR_USED (olddecl))
1960 /* From [temp.expl.spec]:
1962 If a template, a member template or the member of a class
1963 template is explicitly specialized then that
1964 specialization shall be declared before the first use of
1965 that specialization that would cause an implicit
1966 instantiation to take place, in every translation unit in
1967 which such a use occurs. */
1968 error ("explicit specialization of %qD after first use",
1971 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1973 /* Don't propagate visibility from the template to the
1974 specialization here. We'll do that in determine_visibility if
1976 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1978 /* [temp.expl.spec/14] We don't inline explicit specialization
1979 just because the primary template says so. */
1981 else if (new_defines_function && DECL_INITIAL (olddecl))
1983 /* Never inline re-defined extern inline functions.
1984 FIXME: this could be better handled by keeping both
1985 function as separate declarations. */
1986 DECL_UNINLINABLE (newdecl) = 1;
1990 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1991 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1993 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1995 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1996 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1998 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1999 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2000 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2001 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2004 /* Preserve abstractness on cloned [cd]tors. */
2005 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2007 /* Update newdecl's parms to point at olddecl. */
2008 for (parm = DECL_ARGUMENTS (newdecl); parm;
2009 parm = TREE_CHAIN (parm))
2010 DECL_CONTEXT (parm) = olddecl;
2014 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2015 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2016 COPY_DECL_RTL (newdecl, olddecl);
2018 if (! types_match || new_defines_function)
2020 /* These need to be copied so that the names are available.
2021 Note that if the types do match, we'll preserve inline
2022 info and other bits, but if not, we won't. */
2023 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2024 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2026 if (new_defines_function)
2027 /* If defining a function declared with other language
2028 linkage, use the previously declared language linkage. */
2029 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2030 else if (types_match)
2032 /* If redeclaring a builtin function, and not a definition,
2033 it stays built in. */
2034 if (DECL_BUILT_IN (olddecl))
2036 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2037 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2038 /* If we're keeping the built-in definition, keep the rtl,
2039 regardless of declaration matches. */
2040 COPY_DECL_RTL (olddecl, newdecl);
2043 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2044 /* Don't clear out the arguments if we're just redeclaring a
2046 if (DECL_ARGUMENTS (olddecl))
2047 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2050 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2051 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2053 /* Now preserve various other info from the definition. */
2054 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2055 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2056 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2057 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2059 /* Warn about conflicting visibility specifications. */
2060 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2061 && DECL_VISIBILITY_SPECIFIED (newdecl)
2062 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2064 warning_at (input_location, OPT_Wattributes,
2065 "%q+D: visibility attribute ignored because it", newdecl);
2066 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2067 "conflicts with previous declaration here");
2069 /* Choose the declaration which specified visibility. */
2070 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2072 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2073 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2075 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2076 so keep this behavior. */
2077 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2079 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2080 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2083 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2084 with that from NEWDECL below. */
2085 if (DECL_LANG_SPECIFIC (olddecl))
2087 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2088 != DECL_LANG_SPECIFIC (newdecl));
2089 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2092 /* Merge the USED information. */
2093 if (TREE_USED (olddecl))
2094 TREE_USED (newdecl) = 1;
2095 else if (TREE_USED (newdecl))
2096 TREE_USED (olddecl) = 1;
2098 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2102 function_size = sizeof (struct tree_decl_common);
2104 memcpy ((char *) olddecl + sizeof (struct tree_common),
2105 (char *) newdecl + sizeof (struct tree_common),
2106 function_size - sizeof (struct tree_common));
2108 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2109 (char *) newdecl + sizeof (struct tree_decl_common),
2110 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2111 if (new_template_info)
2112 /* If newdecl is a template instantiation, it is possible that
2113 the following sequence of events has occurred:
2115 o A friend function was declared in a class template. The
2116 class template was instantiated.
2118 o The instantiation of the friend declaration was
2119 recorded on the instantiation list, and is newdecl.
2121 o Later, however, instantiate_class_template called pushdecl
2122 on the newdecl to perform name injection. But, pushdecl in
2123 turn called duplicate_decls when it discovered that another
2124 declaration of a global function with the same name already
2127 o Here, in duplicate_decls, we decided to clobber newdecl.
2129 If we're going to do that, we'd better make sure that
2130 olddecl, and not newdecl, is on the list of
2131 instantiations so that if we try to do the instantiation
2132 again we won't get the clobbered declaration. */
2133 reregister_specialization (newdecl,
2139 size_t size = tree_code_size (TREE_CODE (olddecl));
2140 memcpy ((char *) olddecl + sizeof (struct tree_common),
2141 (char *) newdecl + sizeof (struct tree_common),
2142 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2143 switch (TREE_CODE (olddecl))
2153 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2154 (char *) newdecl + sizeof (struct tree_decl_common),
2155 size - sizeof (struct tree_decl_common)
2156 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2160 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2161 (char *) newdecl + sizeof (struct tree_decl_common),
2162 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2163 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2167 DECL_UID (olddecl) = olddecl_uid;
2169 DECL_FRIEND_P (olddecl) = 1;
2172 DECL_ANTICIPATED (olddecl) = 1;
2173 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2176 /* NEWDECL contains the merged attribute lists.
2177 Update OLDDECL to be the same. */
2178 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2180 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2181 so that encode_section_info has a chance to look at the new decl
2182 flags and attributes. */
2183 if (DECL_RTL_SET_P (olddecl)
2184 && (TREE_CODE (olddecl) == FUNCTION_DECL
2185 || (TREE_CODE (olddecl) == VAR_DECL
2186 && TREE_STATIC (olddecl))))
2187 make_decl_rtl (olddecl);
2189 /* The NEWDECL will no longer be needed. Because every out-of-class
2190 declaration of a member results in a call to duplicate_decls,
2191 freeing these nodes represents in a significant savings. */
2197 /* Return zero if the declaration NEWDECL is valid
2198 when the declaration OLDDECL (assumed to be for the same name)
2199 has already been seen.
2200 Otherwise return an error message format string with a %s
2201 where the identifier should go. */
2204 redeclaration_error_message (tree newdecl, tree olddecl)
2206 if (TREE_CODE (newdecl) == TYPE_DECL)
2208 /* Because C++ can put things into name space for free,
2209 constructs like "typedef struct foo { ... } foo"
2210 would look like an erroneous redeclaration. */
2211 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2214 return "redefinition of %q#D";
2216 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2218 /* If this is a pure function, its olddecl will actually be
2219 the original initialization to `0' (which we force to call
2220 abort()). Don't complain about redefinition in this case. */
2221 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2222 && DECL_INITIAL (olddecl) == NULL_TREE)
2225 /* If both functions come from different namespaces, this is not
2226 a redeclaration - this is a conflict with a used function. */
2227 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2228 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2229 && ! decls_match (olddecl, newdecl))
2230 return "%qD conflicts with used function";
2232 /* We'll complain about linkage mismatches in
2233 warn_extern_redeclared_static. */
2235 /* Defining the same name twice is no good. */
2236 if (DECL_INITIAL (olddecl) != NULL_TREE
2237 && DECL_INITIAL (newdecl) != NULL_TREE)
2239 if (DECL_NAME (olddecl) == NULL_TREE)
2240 return "%q#D not declared in class";
2241 else if (!GNU_INLINE_P (olddecl)
2242 || GNU_INLINE_P (newdecl))
2243 return "redefinition of %q#D";
2246 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2248 bool olda = GNU_INLINE_P (olddecl);
2249 bool newa = GNU_INLINE_P (newdecl);
2254 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2256 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2262 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2266 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2268 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2269 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2270 return "redefinition of %q#D";
2274 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2275 || (DECL_TEMPLATE_RESULT (newdecl)
2276 == DECL_TEMPLATE_RESULT (olddecl)))
2279 nt = DECL_TEMPLATE_RESULT (newdecl);
2280 if (DECL_TEMPLATE_INFO (nt))
2281 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2282 ot = DECL_TEMPLATE_RESULT (olddecl);
2283 if (DECL_TEMPLATE_INFO (ot))
2284 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2285 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2286 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2287 return "redefinition of %q#D";
2289 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2291 bool olda = GNU_INLINE_P (ot);
2292 bool newa = GNU_INLINE_P (nt);
2297 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2299 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2303 /* Core issue #226 (C++0x):
2305 If a friend function template declaration specifies a
2306 default template-argument, that declaration shall be a
2307 definition and shall be the only declaration of the
2308 function template in the translation unit. */
2309 if ((cxx_dialect != cxx98)
2310 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2311 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2312 /*is_primary=*/1, /*is_partial=*/0,
2313 /*is_friend_decl=*/2))
2314 return "redeclaration of friend %q#D may not have default template arguments";
2318 else if (TREE_CODE (newdecl) == VAR_DECL
2319 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2320 && (! DECL_LANG_SPECIFIC (olddecl)
2321 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2322 || DECL_THREAD_LOCAL_P (newdecl)))
2324 /* Only variables can be thread-local, and all declarations must
2325 agree on this property. */
2326 if (DECL_THREAD_LOCAL_P (newdecl))
2327 return "thread-local declaration of %q#D follows "
2328 "non-thread-local declaration";
2330 return "non-thread-local declaration of %q#D follows "
2331 "thread-local declaration";
2333 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2335 /* The objects have been declared at namespace scope. If either
2336 is a member of an anonymous union, then this is an invalid
2337 redeclaration. For example:
2343 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2344 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2345 return "redeclaration of %q#D";
2346 /* If at least one declaration is a reference, there is no
2347 conflict. For example:
2353 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2355 /* Reject two definitions. */
2356 return "redefinition of %q#D";
2360 /* Objects declared with block scope: */
2361 /* Reject two definitions, and reject a definition
2362 together with an external reference. */
2363 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2364 return "redeclaration of %q#D";
2369 /* Hash and equality functions for the named_label table. */
2372 named_label_entry_hash (const void *data)
2374 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2375 return DECL_UID (ent->label_decl);
2379 named_label_entry_eq (const void *a, const void *b)
2381 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2382 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2383 return ent_a->label_decl == ent_b->label_decl;
2386 /* Create a new label, named ID. */
2389 make_label_decl (tree id, int local_p)
2391 struct named_label_entry *ent;
2395 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2397 DECL_CONTEXT (decl) = current_function_decl;
2398 DECL_MODE (decl) = VOIDmode;
2399 C_DECLARED_LABEL_FLAG (decl) = local_p;
2401 /* Say where one reference is to the label, for the sake of the
2402 error if it is not defined. */
2403 DECL_SOURCE_LOCATION (decl) = input_location;
2405 /* Record the fact that this identifier is bound to this label. */
2406 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2408 /* Create the label htab for the function on demand. */
2410 named_labels = htab_create_ggc (13, named_label_entry_hash,
2411 named_label_entry_eq, NULL);
2413 /* Record this label on the list of labels used in this function.
2414 We do this before calling make_label_decl so that we get the
2415 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2416 ent = GGC_CNEW (struct named_label_entry);
2417 ent->label_decl = decl;
2419 slot = htab_find_slot (named_labels, ent, INSERT);
2420 gcc_assert (*slot == NULL);
2426 /* Look for a label named ID in the current function. If one cannot
2427 be found, create one. (We keep track of used, but undefined,
2428 labels, and complain about them at the end of a function.) */
2431 lookup_label (tree id)
2435 timevar_push (TV_NAME_LOOKUP);
2436 /* You can't use labels at global scope. */
2437 if (current_function_decl == NULL_TREE)
2439 error ("label %qE referenced outside of any function", id);
2440 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2443 /* See if we've already got this label. */
2444 decl = IDENTIFIER_LABEL_VALUE (id);
2445 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2446 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2448 decl = make_label_decl (id, /*local_p=*/0);
2449 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2452 /* Declare a local label named ID. */
2455 declare_local_label (tree id)
2459 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2460 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2461 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2462 current_binding_level->shadowed_labels);
2463 current_binding_level->shadowed_labels = shadow;
2465 decl = make_label_decl (id, /*local_p=*/1);
2466 TREE_VALUE (shadow) = decl;
2471 /* Returns nonzero if it is ill-formed to jump past the declaration of
2472 DECL. Returns 2 if it's also a real problem. */
2475 decl_jump_unsafe (tree decl)
2477 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2478 with automatic storage duration is not in scope to a point where it is
2479 in scope is ill-formed unless the variable has scalar type, class type
2480 with a trivial default constructor and a trivial destructor, a
2481 cv-qualified version of one of these types, or an array of one of the
2482 preceding types and is declared without an initializer (8.5). */
2483 tree type = TREE_TYPE (decl);
2485 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2486 || type == error_mark_node)
2489 type = strip_array_types (type);
2491 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2492 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2495 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2501 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2504 identify_goto (tree decl, const location_t *locus)
2507 permerror (input_location, "jump to label %qD", decl);
2509 permerror (input_location, "jump to case label");
2511 permerror (*locus, " from here");
2514 /* Check that a single previously seen jump to a newly defined label
2515 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2516 the jump context; NAMES are the names in scope in LEVEL at the jump
2517 context; LOCUS is the source position of the jump or 0. Returns
2518 true if all is well. */
2521 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2522 bool exited_omp, const location_t *locus)
2524 struct cp_binding_level *b;
2525 bool identified = false, saw_eh = false, saw_omp = false;
2529 identify_goto (decl, locus);
2530 error (" exits OpenMP structured block");
2531 identified = saw_omp = true;
2534 for (b = current_binding_level; b ; b = b->level_chain)
2536 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2538 for (new_decls = b->names; new_decls != old_decls;
2539 new_decls = TREE_CHAIN (new_decls))
2541 int problem = decl_jump_unsafe (new_decls);
2547 identify_goto (decl, locus);
2551 error (" crosses initialization of %q+#D", new_decls);
2553 permerror (input_location, " enters scope of %q+#D which has "
2554 "non-trivial destructor", new_decls);
2559 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2563 identify_goto (decl, locus);
2566 if (b->kind == sk_try)
2567 error (" enters try block");
2569 error (" enters catch block");
2572 if (b->kind == sk_omp && !saw_omp)
2576 identify_goto (decl, locus);
2579 error (" enters OpenMP structured block");
2588 check_previous_goto (tree decl, struct named_label_use_entry *use)
2590 check_previous_goto_1 (decl, use->binding_level,
2591 use->names_in_scope, use->in_omp_scope,
2592 &use->o_goto_locus);
2596 check_switch_goto (struct cp_binding_level* level)
2598 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2601 /* Check that a new jump to a label DECL is OK. Called by
2602 finish_goto_stmt. */
2605 check_goto (tree decl)
2607 struct named_label_entry *ent, dummy;
2608 bool saw_catch = false, identified = false;
2611 /* We can't know where a computed goto is jumping.
2612 So we assume that it's OK. */
2613 if (TREE_CODE (decl) != LABEL_DECL)
2616 /* We didn't record any information about this label when we created it,
2617 and there's not much point since it's trivial to analyze as a return. */
2618 if (decl == cdtor_label)
2621 dummy.label_decl = decl;
2622 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2623 gcc_assert (ent != NULL);
2625 /* If the label hasn't been defined yet, defer checking. */
2626 if (! DECL_INITIAL (decl))
2628 struct named_label_use_entry *new_use;
2630 /* Don't bother creating another use if the last goto had the
2631 same data, and will therefore create the same set of errors. */
2633 && ent->uses->names_in_scope == current_binding_level->names)
2636 new_use = GGC_NEW (struct named_label_use_entry);
2637 new_use->binding_level = current_binding_level;
2638 new_use->names_in_scope = current_binding_level->names;
2639 new_use->o_goto_locus = input_location;
2640 new_use->in_omp_scope = false;
2642 new_use->next = ent->uses;
2643 ent->uses = new_use;
2647 if (ent->in_try_scope || ent->in_catch_scope
2648 || ent->in_omp_scope || ent->bad_decls)
2650 permerror (input_location, "jump to label %q+D", decl);
2651 permerror (input_location, " from here");
2655 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2657 tree b = TREE_VALUE (bad);
2658 int u = decl_jump_unsafe (b);
2660 if (u > 1 && DECL_ARTIFICIAL (b))
2662 /* Can't skip init of __exception_info. */
2663 error_at (DECL_SOURCE_LOCATION (b), " enters catch block");
2667 error (" skips initialization of %q+#D", b);
2669 permerror (input_location, " enters scope of %q+#D which has "
2670 "non-trivial destructor", b);
2673 if (ent->in_try_scope)
2674 error (" enters try block");
2675 else if (ent->in_catch_scope && !saw_catch)
2676 error (" enters catch block");
2678 if (ent->in_omp_scope)
2679 error (" enters OpenMP structured block");
2680 else if (flag_openmp)
2682 struct cp_binding_level *b;
2683 for (b = current_binding_level; b ; b = b->level_chain)
2685 if (b == ent->binding_level)
2687 if (b->kind == sk_omp)
2691 permerror (input_location, "jump to label %q+D", decl);
2692 permerror (input_location, " from here");
2695 error (" exits OpenMP structured block");
2702 /* Check that a return is ok wrt OpenMP structured blocks.
2703 Called by finish_return_stmt. Returns true if all is well. */
2706 check_omp_return (void)
2708 struct cp_binding_level *b;
2709 for (b = current_binding_level; b ; b = b->level_chain)
2710 if (b->kind == sk_omp)
2712 error ("invalid exit from OpenMP structured block");
2718 /* Define a label, specifying the location in the source file.
2719 Return the LABEL_DECL node for the label. */
2722 define_label (location_t location, tree name)
2724 struct named_label_entry *ent, dummy;
2725 struct cp_binding_level *p;
2728 timevar_push (TV_NAME_LOOKUP);
2730 decl = lookup_label (name);
2732 dummy.label_decl = decl;
2733 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2734 gcc_assert (ent != NULL);
2736 /* After labels, make any new cleanups in the function go into their
2737 own new (temporary) binding contour. */
2738 for (p = current_binding_level;
2739 p->kind != sk_function_parms;
2741 p->more_cleanups_ok = 0;
2743 if (name == get_identifier ("wchar_t"))
2744 permerror (input_location, "label named wchar_t");
2746 if (DECL_INITIAL (decl) != NULL_TREE)
2748 error ("duplicate label %qD", decl);
2749 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2753 struct named_label_use_entry *use;
2755 /* Mark label as having been defined. */
2756 DECL_INITIAL (decl) = error_mark_node;
2757 /* Say where in the source. */
2758 DECL_SOURCE_LOCATION (decl) = location;
2760 ent->binding_level = current_binding_level;
2761 ent->names_in_scope = current_binding_level->names;
2763 for (use = ent->uses; use ; use = use->next)
2764 check_previous_goto (decl, use);
2768 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2773 struct cp_binding_level *level;
2774 struct cp_switch *next;
2775 /* The SWITCH_STMT being built. */
2777 /* A splay-tree mapping the low element of a case range to the high
2778 element, or NULL_TREE if there is no high element. Used to
2779 determine whether or not a new case label duplicates an old case
2780 label. We need a tree, rather than simply a hash table, because
2781 of the GNU case range extension. */
2785 /* A stack of the currently active switch statements. The innermost
2786 switch statement is on the top of the stack. There is no need to
2787 mark the stack for garbage collection because it is only active
2788 during the processing of the body of a function, and we never
2789 collect at that point. */
2791 static struct cp_switch *switch_stack;
2793 /* Called right after a switch-statement condition is parsed.
2794 SWITCH_STMT is the switch statement being parsed. */
2797 push_switch (tree switch_stmt)
2799 struct cp_switch *p = XNEW (struct cp_switch);
2800 p->level = current_binding_level;
2801 p->next = switch_stack;
2802 p->switch_stmt = switch_stmt;
2803 p->cases = splay_tree_new (case_compare, NULL, NULL);
2810 struct cp_switch *cs = switch_stack;
2811 location_t switch_location;
2813 /* Emit warnings as needed. */
2814 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2815 switch_location = EXPR_LOCATION (cs->switch_stmt);
2817 switch_location = input_location;
2818 if (!processing_template_decl)
2819 c_do_switch_warnings (cs->cases, switch_location,
2820 SWITCH_STMT_TYPE (cs->switch_stmt),
2821 SWITCH_STMT_COND (cs->switch_stmt));
2823 splay_tree_delete (cs->cases);
2824 switch_stack = switch_stack->next;
2828 /* Note that we've seen a definition of a case label, and complain if this
2829 is a bad place for one. */
2832 finish_case_label (location_t loc, tree low_value, tree high_value)
2835 struct cp_binding_level *p;
2837 if (processing_template_decl)
2841 /* For templates, just add the case label; we'll do semantic
2842 analysis at instantiation-time. */
2843 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2844 return add_stmt (build_case_label (loc, low_value, high_value, label));
2847 /* Find the condition on which this switch statement depends. */
2848 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2849 if (cond && TREE_CODE (cond) == TREE_LIST)
2850 cond = TREE_VALUE (cond);
2852 if (!check_switch_goto (switch_stack->level))
2853 return error_mark_node;
2855 r = c_add_case_label (loc, switch_stack->cases, cond,
2856 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2857 low_value, high_value);
2859 /* After labels, make any new cleanups in the function go into their
2860 own new (temporary) binding contour. */
2861 for (p = current_binding_level;
2862 p->kind != sk_function_parms;
2864 p->more_cleanups_ok = 0;
2869 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2872 typename_hash (const void* k)
2875 const_tree const t = (const_tree) k;
2877 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2878 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2883 typedef struct typename_info {
2891 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2892 really of type `typename_info*' */
2895 typename_compare (const void * k1, const void * k2)
2897 const_tree const t1 = (const_tree) k1;
2898 const typename_info *const t2 = (const typename_info *) k2;
2900 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2901 && TYPE_CONTEXT (t1) == t2->scope
2902 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2903 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2904 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2907 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2908 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2910 Returns the new TYPENAME_TYPE. */
2912 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2915 build_typename_type (tree context, tree name, tree fullname,
2916 enum tag_types tag_type)
2924 if (typename_htab == NULL)
2925 typename_htab = htab_create_ggc (61, &typename_hash,
2926 &typename_compare, NULL);
2928 ti.scope = FROB_CONTEXT (context);
2930 ti.template_id = fullname;
2931 ti.enum_p = tag_type == enum_type;
2932 ti.class_p = (tag_type == class_type
2933 || tag_type == record_type
2934 || tag_type == union_type);
2935 hash = (htab_hash_pointer (ti.scope)
2936 ^ htab_hash_pointer (ti.name));
2938 /* See if we already have this type. */
2939 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2944 /* Build the TYPENAME_TYPE. */
2945 t = cxx_make_type (TYPENAME_TYPE);
2946 TYPE_CONTEXT (t) = ti.scope;
2947 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2948 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2949 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2951 /* Build the corresponding TYPE_DECL. */
2952 d = build_decl (input_location, TYPE_DECL, name, t);
2953 TYPE_NAME (TREE_TYPE (d)) = d;
2954 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2955 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2956 DECL_ARTIFICIAL (d) = 1;
2958 /* Store it in the hash table. */
2961 /* TYPENAME_TYPEs must always be compared structurally, because
2962 they may or may not resolve down to another type depending on
2963 the currently open classes. */
2964 SET_TYPE_STRUCTURAL_EQUALITY (t);
2970 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2971 provided to name the type. Returns an appropriate type, unless an
2972 error occurs, in which case error_mark_node is returned. If we
2973 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2974 return that, rather than the _TYPE it corresponds to, in other
2975 cases we look through the type decl. If TF_ERROR is set, complain
2976 about errors, otherwise be quiet. */
2979 make_typename_type (tree context, tree name, enum tag_types tag_type,
2980 tsubst_flags_t complain)
2986 if (name == error_mark_node
2987 || context == NULL_TREE
2988 || context == error_mark_node)
2989 return error_mark_node;
2993 if (!(TYPE_LANG_SPECIFIC (name)
2994 && (CLASSTYPE_IS_TEMPLATE (name)
2995 || CLASSTYPE_USE_TEMPLATE (name))))
2996 name = TYPE_IDENTIFIER (name);
2998 /* Create a TEMPLATE_ID_EXPR for the type. */
2999 name = build_nt (TEMPLATE_ID_EXPR,
3000 CLASSTYPE_TI_TEMPLATE (name),
3001 CLASSTYPE_TI_ARGS (name));
3003 else if (TREE_CODE (name) == TYPE_DECL)
3004 name = DECL_NAME (name);
3008 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3010 name = TREE_OPERAND (name, 0);
3011 if (TREE_CODE (name) == TEMPLATE_DECL)
3012 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3013 else if (TREE_CODE (name) == OVERLOAD)
3015 error ("%qD is not a type", name);
3016 return error_mark_node;
3019 if (TREE_CODE (name) == TEMPLATE_DECL)
3021 error ("%qD used without template parameters", name);
3022 return error_mark_node;
3024 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3025 gcc_assert (TYPE_P (context));
3027 if (!MAYBE_CLASS_TYPE_P (context))
3029 if (complain & tf_error)
3030 error ("%q#T is not a class", context);
3031 return error_mark_node;
3034 /* When the CONTEXT is a dependent type, NAME could refer to a
3035 dependent base class of CONTEXT. But look inside it anyway
3036 if CONTEXT is a currently open scope, in case it refers to a
3037 member of the current instantiation or a non-dependent base;
3038 lookup will stop when we hit a dependent base. */
3039 if (!dependent_scope_p (context))
3040 /* We should only set WANT_TYPE when we're a nested typename type.
3041 Then we can give better diagnostics if we find a non-type. */
3042 t = lookup_field (context, name, 0, /*want_type=*/true);
3046 if (!t && dependent_type_p (context))
3047 return build_typename_type (context, name, fullname, tag_type);
3049 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3053 if (complain & tf_error)
3054 error (want_template ? "no class template named %q#T in %q#T"
3055 : "no type named %q#T in %q#T", name, context);
3056 return error_mark_node;
3059 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3061 if (complain & tf_error)
3062 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3064 return error_mark_node;
3066 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3068 if (complain & tf_error)
3069 error ("%<typename %T::%D%> names %q#T, which is not a type",
3071 return error_mark_node;
3074 if (complain & tf_error)
3075 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3078 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3080 /*entering_scope=*/0,
3081 tf_warning_or_error | tf_user);
3083 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3089 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3090 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3091 in which case error_mark_node is returned.
3093 If PARM_LIST is non-NULL, also make sure that the template parameter
3094 list of TEMPLATE_DECL matches.
3096 If COMPLAIN zero, don't complain about any errors that occur. */
3099 make_unbound_class_template (tree context, tree name, tree parm_list,
3100 tsubst_flags_t complain)
3106 name = TYPE_IDENTIFIER (name);
3107 else if (DECL_P (name))
3108 name = DECL_NAME (name);
3109 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3111 if (!dependent_type_p (context)
3112 || currently_open_class (context))
3114 tree tmpl = NULL_TREE;
3116 if (MAYBE_CLASS_TYPE_P (context))
3117 tmpl = lookup_field (context, name, 0, false);
3119 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3121 if (complain & tf_error)
3122 error ("no class template named %q#T in %q#T", name, context);
3123 return error_mark_node;
3127 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3129 if (complain & tf_error)
3131 error ("template parameters do not match template");
3132 error ("%q+D declared here", tmpl);
3134 return error_mark_node;
3137 if (complain & tf_error)
3138 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3143 /* Build the UNBOUND_CLASS_TEMPLATE. */
3144 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3145 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3146 TREE_TYPE (t) = NULL_TREE;
3147 SET_TYPE_STRUCTURAL_EQUALITY (t);
3149 /* Build the corresponding TEMPLATE_DECL. */
3150 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3151 TYPE_NAME (TREE_TYPE (d)) = d;
3152 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3153 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3154 DECL_ARTIFICIAL (d) = 1;
3155 DECL_TEMPLATE_PARMS (d) = parm_list;
3162 /* Push the declarations of builtin types into the namespace.
3163 RID_INDEX is the index of the builtin type in the array
3164 RID_POINTERS. NAME is the name used when looking up the builtin
3165 type. TYPE is the _TYPE node for the builtin type. */
3168 record_builtin_type (enum rid rid_index,
3172 tree rname = NULL_TREE, tname = NULL_TREE;
3173 tree tdecl = NULL_TREE;
3175 if ((int) rid_index < (int) RID_MAX)
3176 rname = ridpointers[(int) rid_index];
3178 tname = get_identifier (name);
3180 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3181 eliminated. Built-in types should not be looked up name; their
3182 names are keywords that the parser can recognize. However, there
3183 is code in c-common.c that uses identifier_global_value to look
3184 up built-in types by name. */
3187 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3188 DECL_ARTIFICIAL (tdecl) = 1;
3189 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3195 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3196 DECL_ARTIFICIAL (tdecl) = 1;
3198 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3201 if (!TYPE_NAME (type))
3202 TYPE_NAME (type) = tdecl;
3205 debug_hooks->type_decl (tdecl, 0);
3208 /* Record one of the standard Java types.
3209 * Declare it as having the given NAME.
3210 * If SIZE > 0, it is the size of one of the integral types;
3211 * otherwise it is the negative of the size of one of the other types. */
3214 record_builtin_java_type (const char* name, int size)
3218 type = build_nonstandard_integer_type (size, 0);
3219 else if (size > -32)
3222 /* "__java_char" or ""__java_boolean". */
3223 type = build_nonstandard_integer_type (-size, 1);
3224 /* Get the signed type cached and attached to the unsigned type,
3225 so it doesn't get garbage-collected at "random" times,
3226 causing potential codegen differences out of different UIDs
3227 and different alias set numbers. */
3228 stype = build_nonstandard_integer_type (-size, 0);
3229 TREE_CHAIN (type) = stype;
3230 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3233 { /* "__java_float" or ""__java_double". */
3234 type = make_node (REAL_TYPE);
3235 TYPE_PRECISION (type) = - size;
3238 record_builtin_type (RID_MAX, name, type);
3239 decl = TYPE_NAME (type);
3241 /* Suppress generate debug symbol entries for these types,
3242 since for normal C++ they are just clutter.
3243 However, push_lang_context undoes this if extern "Java" is seen. */
3244 DECL_IGNORED_P (decl) = 1;
3246 TYPE_FOR_JAVA (type) = 1;
3250 /* Push a type into the namespace so that the back ends ignore it. */
3253 record_unknown_type (tree type, const char* name)
3255 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3256 TYPE_DECL, get_identifier (name), type));
3257 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3258 DECL_IGNORED_P (decl) = 1;
3259 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3260 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3261 TYPE_ALIGN (type) = 1;
3262 TYPE_USER_ALIGN (type) = 0;
3263 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3266 /* A string for which we should create an IDENTIFIER_NODE at
3269 typedef struct predefined_identifier
3271 /* The name of the identifier. */
3272 const char *const name;
3273 /* The place where the IDENTIFIER_NODE should be stored. */
3275 /* Nonzero if this is the name of a constructor or destructor. */
3276 const int ctor_or_dtor_p;
3277 } predefined_identifier;
3279 /* Create all the predefined identifiers. */
3282 initialize_predefined_identifiers (void)
3284 const predefined_identifier *pid;
3286 /* A table of identifiers to create at startup. */
3287 static const predefined_identifier predefined_identifiers[] = {
3288 { "C++", &lang_name_cplusplus, 0 },
3289 { "C", &lang_name_c, 0 },
3290 { "Java", &lang_name_java, 0 },
3291 /* Some of these names have a trailing space so that it is
3292 impossible for them to conflict with names written by users. */
3293 { "__ct ", &ctor_identifier, 1 },
3294 { "__base_ctor ", &base_ctor_identifier, 1 },
3295 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3296 { "__dt ", &dtor_identifier, 1 },
3297 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3298 { "__base_dtor ", &base_dtor_identifier, 1 },
3299 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3300 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3301 { "nelts", &nelts_identifier, 0 },
3302 { THIS_NAME, &this_identifier, 0 },
3303 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3304 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3305 { "_vptr", &vptr_identifier, 0 },
3306 { "__vtt_parm", &vtt_parm_identifier, 0 },
3307 { "::", &global_scope_name, 0 },
3308 { "std", &std_identifier, 0 },
3312 for (pid = predefined_identifiers; pid->name; ++pid)
3314 *pid->node = get_identifier (pid->name);
3315 if (pid->ctor_or_dtor_p)
3316 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3320 /* Create the predefined scalar types of C,
3321 and some nodes representing standard constants (0, 1, (void *)0).
3322 Initialize the global binding level.
3323 Make definitions for built-in primitive functions. */
3326 cxx_init_decl_processing (void)
3329 tree void_ftype_ptr;
3331 build_common_tree_nodes (flag_signed_char, false);
3333 /* Create all the identifiers we need. */
3334 initialize_predefined_identifiers ();
3336 /* Create the global variables. */
3337 push_to_top_level ();
3339 current_function_decl = NULL_TREE;
3340 current_binding_level = NULL;
3341 /* Enter the global namespace. */
3342 gcc_assert (global_namespace == NULL_TREE);
3343 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3345 TREE_PUBLIC (global_namespace) = 1;
3346 begin_scope (sk_namespace, global_namespace);
3348 current_lang_name = NULL_TREE;
3350 if (flag_visibility_ms_compat)
3351 default_visibility = VISIBILITY_HIDDEN;
3354 current_lang_name = lang_name_c;
3356 /* Create the `std' namespace. */
3357 push_namespace (std_identifier);
3358 std_node = current_namespace;
3361 c_common_nodes_and_builtins ();
3363 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3364 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3365 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3366 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3367 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3368 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3369 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3370 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3372 integer_two_node = build_int_cst (NULL_TREE, 2);
3373 integer_three_node = build_int_cst (NULL_TREE, 3);
3375 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3376 truthvalue_type_node = boolean_type_node;
3377 truthvalue_false_node = boolean_false_node;
3378 truthvalue_true_node = boolean_true_node;
3380 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3383 record_builtin_type (RID_MAX, NULL, string_type_node);
3386 delta_type_node = ptrdiff_type_node;
3387 vtable_index_type = ptrdiff_type_node;
3389 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3390 void_ftype = build_function_type (void_type_node, void_list_node);
3391 void_ftype_ptr = build_function_type (void_type_node,
3392 tree_cons (NULL_TREE,
3396 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3398 /* C++ extensions */
3400 unknown_type_node = make_node (UNKNOWN_TYPE);
3401 record_unknown_type (unknown_type_node, "unknown type");
3403 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3404 TREE_TYPE (unknown_type_node) = unknown_type_node;
3406 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3408 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3409 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3411 init_list_type_node = make_node (UNKNOWN_TYPE);
3412 record_unknown_type (init_list_type_node, "init list");
3415 /* Make sure we get a unique function type, so we can give
3416 its pointer type a name. (This wins for gdb.) */
3417 tree vfunc_type = make_node (FUNCTION_TYPE);
3418 TREE_TYPE (vfunc_type) = integer_type_node;
3419 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3420 layout_type (vfunc_type);
3422 vtable_entry_type = build_pointer_type (vfunc_type);
3424 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3427 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3428 layout_type (vtbl_type_node);
3429 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3430 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3431 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3432 layout_type (vtbl_ptr_type_node);
3433 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3435 push_namespace (get_identifier ("__cxxabiv1"));
3436 abi_node = current_namespace;
3439 global_type_node = make_node (LANG_TYPE);
3440 record_unknown_type (global_type_node, "global type");
3443 current_lang_name = lang_name_cplusplus;
3447 tree bad_alloc_type_node;
3448 tree bad_alloc_decl;
3449 tree newtype, deltype;
3450 tree ptr_ftype_sizetype;
3452 push_namespace (std_identifier);
3453 bad_alloc_id = get_identifier ("bad_alloc");
3454 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3455 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3457 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3458 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3459 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3463 = build_function_type (ptr_type_node,
3464 tree_cons (NULL_TREE,
3467 newtype = build_exception_variant
3468 (ptr_ftype_sizetype, add_exception_specifier
3469 (NULL_TREE, bad_alloc_type_node, -1));
3470 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3471 push_cp_library_fn (NEW_EXPR, newtype);
3472 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3473 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3474 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3478 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3480 /* Perform other language dependent initializations. */
3481 init_class_processing ();
3482 init_rtti_processing ();
3483 init_template_processing ();
3485 if (flag_exceptions)
3486 init_exception_processing ();
3488 if (! supports_one_only ())
3491 make_fname_decl = cp_make_fname_decl;
3492 start_fname_decls ();
3494 /* Show we use EH for cleanups. */
3495 if (flag_exceptions)
3496 using_eh_for_cleanups ();
3499 /* Generate an initializer for a function naming variable from
3500 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3501 filled in with the type of the init. */
3504 cp_fname_init (const char* name, tree *type_p)
3506 tree domain = NULL_TREE;
3508 tree init = NULL_TREE;
3513 length = strlen (name);
3514 domain = build_index_type (size_int (length));
3515 init = build_string (length + 1, name);
3518 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3519 type = build_cplus_array_type (type, domain);
3524 TREE_TYPE (init) = type;
3526 init = error_mark_node;
3531 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3532 the decl, LOC is the location to give the decl, NAME is the
3533 initialization string and TYPE_DEP indicates whether NAME depended
3534 on the type of the function. We make use of that to detect
3535 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3536 at the point of first use, so we mustn't push the decl now. */
3539 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3541 const char *const name = (type_dep && processing_template_decl
3542 ? NULL : fname_as_string (type_dep));
3544 tree init = cp_fname_init (name, &type);
3545 tree decl = build_decl (loc, VAR_DECL, id, type);
3548 free (CONST_CAST (char *, name));
3550 /* As we're using pushdecl_with_scope, we must set the context. */
3551 DECL_CONTEXT (decl) = current_function_decl;
3552 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3554 TREE_STATIC (decl) = 1;
3555 TREE_READONLY (decl) = 1;
3556 DECL_ARTIFICIAL (decl) = 1;
3558 TREE_USED (decl) = 1;
3560 if (current_function_decl)
3562 struct cp_binding_level *b = current_binding_level;
3563 while (b->level_chain->kind != sk_function_parms)
3565 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3566 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3567 LOOKUP_ONLYCONVERTING);
3570 pushdecl_top_level_and_finish (decl, init);
3576 builtin_function_1 (tree decl, tree context, bool is_global)
3578 tree id = DECL_NAME (decl);
3579 const char *name = IDENTIFIER_POINTER (id);
3581 retrofit_lang_decl (decl);
3583 DECL_ARTIFICIAL (decl) = 1;
3584 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3585 SET_DECL_LANGUAGE (decl, lang_c);
3586 /* Runtime library routines are, by definition, available in an
3587 external shared object. */
3588 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3589 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3591 DECL_CONTEXT (decl) = context;
3594 pushdecl_top_level (decl);
3598 /* A function in the user's namespace should have an explicit
3599 declaration before it is used. Mark the built-in function as
3600 anticipated but not actually declared. */
3601 if (name[0] != '_' || name[1] != '_')
3602 DECL_ANTICIPATED (decl) = 1;
3603 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3605 size_t len = strlen (name);
3607 /* Treat __*_chk fortification functions as anticipated as well,
3608 unless they are __builtin_*. */
3609 if (len > strlen ("___chk")
3610 && memcmp (name + len - strlen ("_chk"),
3611 "_chk", strlen ("_chk") + 1) == 0)
3612 DECL_ANTICIPATED (decl) = 1;
3619 cxx_builtin_function (tree decl)
3621 tree id = DECL_NAME (decl);
3622 const char *name = IDENTIFIER_POINTER (id);
3623 /* All builtins that don't begin with an '_' should additionally
3624 go in the 'std' namespace. */
3627 tree decl2 = copy_node(decl);
3628 push_namespace (std_identifier);
3629 builtin_function_1 (decl2, std_node, false);
3633 return builtin_function_1 (decl, NULL_TREE, false);
3636 /* Like cxx_builtin_function, but guarantee the function is added to the global
3637 scope. This is to allow function specific options to add new machine
3638 dependent builtins when the target ISA changes via attribute((target(...)))
3639 which saves space on program startup if the program does not use non-generic
3643 cxx_builtin_function_ext_scope (tree decl)
3646 tree id = DECL_NAME (decl);
3647 const char *name = IDENTIFIER_POINTER (id);
3648 /* All builtins that don't begin with an '_' should additionally
3649 go in the 'std' namespace. */
3652 tree decl2 = copy_node(decl);
3653 push_namespace (std_identifier);
3654 builtin_function_1 (decl2, std_node, true);
3658 return builtin_function_1 (decl, NULL_TREE, true);
3661 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3662 function. Not called directly. */
3665 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3667 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3668 DECL_EXTERNAL (fn) = 1;
3669 TREE_PUBLIC (fn) = 1;
3670 DECL_ARTIFICIAL (fn) = 1;
3671 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3672 SET_DECL_LANGUAGE (fn, lang_c);
3673 /* Runtime library routines are, by definition, available in an
3674 external shared object. */
3675 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3676 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3680 /* Returns the _DECL for a library function with C linkage.
3681 We assume that such functions never throw; if this is incorrect,
3682 callers should unset TREE_NOTHROW. */
3685 build_library_fn (tree name, tree type)
3687 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3688 TREE_NOTHROW (fn) = 1;
3692 /* Returns the _DECL for a library function with C++ linkage. */
3695 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3697 tree fn = build_library_fn_1 (name, operator_code, type);
3698 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3699 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3700 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3704 /* Like build_library_fn, but takes a C string instead of an
3708 build_library_fn_ptr (const char* name, tree type)
3710 return build_library_fn (get_identifier (name), type);
3713 /* Like build_cp_library_fn, but takes a C string instead of an
3717 build_cp_library_fn_ptr (const char* name, tree type)
3719 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3722 /* Like build_library_fn, but also pushes the function so that we will
3723 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3724 may throw exceptions listed in RAISES. */
3727 push_library_fn (tree name, tree type, tree raises)
3732 type = build_exception_variant (type, raises);
3734 fn = build_library_fn (name, type);
3735 pushdecl_top_level (fn);
3739 /* Like build_cp_library_fn, but also pushes the function so that it
3740 will be found by normal lookup. */
3743 push_cp_library_fn (enum tree_code operator_code, tree type)
3745 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3752 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3756 push_void_library_fn (tree name, tree parmtypes)
3758 tree type = build_function_type (void_type_node, parmtypes);
3759 return push_library_fn (name, type, NULL_TREE);
3762 /* Like push_library_fn, but also note that this function throws
3763 and does not return. Used for __throw_foo and the like. */
3766 push_throw_library_fn (tree name, tree type)
3768 tree fn = push_library_fn (name, type, NULL_TREE);
3769 TREE_THIS_VOLATILE (fn) = 1;
3770 TREE_NOTHROW (fn) = 0;
3774 /* When we call finish_struct for an anonymous union, we create
3775 default copy constructors and such. But, an anonymous union
3776 shouldn't have such things; this function undoes the damage to the
3777 anonymous union type T.
3779 (The reason that we create the synthesized methods is that we don't
3780 distinguish `union { int i; }' from `typedef union { int i; } U'.
3781 The first is an anonymous union; the second is just an ordinary
3785 fixup_anonymous_aggr (tree t)
3789 /* Wipe out memory of synthesized methods. */
3790 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3791 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3792 TYPE_HAS_INIT_REF (t) = 0;
3793 TYPE_HAS_CONST_INIT_REF (t) = 0;
3794 TYPE_HAS_ASSIGN_REF (t) = 0;
3795 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3797 /* Splice the implicitly generated functions out of the TYPE_METHODS
3799 q = &TYPE_METHODS (t);
3802 if (DECL_ARTIFICIAL (*q))
3803 *q = TREE_CHAIN (*q);
3805 q = &TREE_CHAIN (*q);
3808 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3809 if (TYPE_METHODS (t))
3811 tree decl = TYPE_MAIN_DECL (t);
3813 if (TREE_CODE (t) != UNION_TYPE)
3814 error_at (DECL_SOURCE_LOCATION (decl),
3815 "an anonymous struct cannot have function members");
3817 error_at (DECL_SOURCE_LOCATION (decl),
3818 "an anonymous union cannot have function members");
3821 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3822 assignment operators (because they cannot have these methods themselves).
3823 For anonymous unions this is already checked because they are not allowed
3824 in any union, otherwise we have to check it. */
3825 if (TREE_CODE (t) != UNION_TYPE)
3829 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3830 if (TREE_CODE (field) == FIELD_DECL)
3832 type = TREE_TYPE (field);
3833 if (CLASS_TYPE_P (type))
3835 if (TYPE_NEEDS_CONSTRUCTING (type))
3836 error ("member %q+#D with constructor not allowed "
3837 "in anonymous aggregate", field);
3838 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3839 error ("member %q+#D with destructor not allowed "
3840 "in anonymous aggregate", field);
3841 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3842 error ("member %q+#D with copy assignment operator "
3843 "not allowed in anonymous aggregate", field);
3849 /* Make sure that a declaration with no declarator is well-formed, i.e.
3850 just declares a tagged type or anonymous union.
3852 Returns the type declared; or NULL_TREE if none. */
3855 check_tag_decl (cp_decl_specifier_seq *declspecs)
3857 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3858 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3859 /* If a class, struct, or enum type is declared by the DECLSPECS
3860 (i.e, if a class-specifier, enum-specifier, or non-typename
3861 elaborated-type-specifier appears in the DECLSPECS),
3862 DECLARED_TYPE is set to the corresponding type. */
3863 tree declared_type = NULL_TREE;
3864 bool error_p = false;
3866 if (declspecs->multiple_types_p)
3867 error ("multiple types in one declaration");
3868 else if (declspecs->redefined_builtin_type)
3870 if (!in_system_header)
3871 permerror (input_location, "redeclaration of C++ built-in type %qT",
3872 declspecs->redefined_builtin_type);
3877 && TYPE_P (declspecs->type)
3878 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3879 && MAYBE_CLASS_TYPE_P (declspecs->type))
3880 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3881 declared_type = declspecs->type;
3882 else if (declspecs->type == error_mark_node)
3884 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3885 permerror (input_location, "declaration does not declare anything");
3886 /* Check for an anonymous union. */
3887 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3888 && TYPE_ANONYMOUS_P (declared_type))
3890 /* 7/3 In a simple-declaration, the optional init-declarator-list
3891 can be omitted only when declaring a class (clause 9) or
3892 enumeration (7.2), that is, when the decl-specifier-seq contains
3893 either a class-specifier, an elaborated-type-specifier with
3894 a class-key (9.1), or an enum-specifier. In these cases and
3895 whenever a class-specifier or enum-specifier is present in the
3896 decl-specifier-seq, the identifiers in these specifiers are among
3897 the names being declared by the declaration (as class-name,
3898 enum-names, or enumerators, depending on the syntax). In such
3899 cases, and except for the declaration of an unnamed bit-field (9.6),
3900 the decl-specifier-seq shall introduce one or more names into the
3901 program, or shall redeclare a name introduced by a previous
3902 declaration. [Example:
3903 enum { }; // ill-formed
3904 typedef class { }; // ill-formed
3908 error ("missing type-name in typedef-declaration");
3911 /* Anonymous unions are objects, so they can have specifiers. */;
3912 SET_ANON_AGGR_TYPE_P (declared_type);
3914 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3915 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3920 if (declspecs->specs[(int)ds_inline]
3921 || declspecs->specs[(int)ds_virtual])
3922 error ("%qs can only be specified for functions",
3923 declspecs->specs[(int)ds_inline]
3924 ? "inline" : "virtual");
3926 && (!current_class_type
3927 || current_scope () != current_class_type))
3928 error ("%<friend%> can only be specified inside a class");
3929 else if (declspecs->specs[(int)ds_explicit])
3930 error ("%<explicit%> can only be specified for constructors");
3931 else if (declspecs->storage_class)
3932 error ("a storage class can only be specified for objects "
3934 else if (declspecs->specs[(int)ds_const]
3935 || declspecs->specs[(int)ds_volatile]
3936 || declspecs->specs[(int)ds_restrict]
3937 || declspecs->specs[(int)ds_thread])
3938 error ("qualifiers can only be specified for objects "
3940 else if (saw_typedef)
3941 warning (0, "%<typedef%> was ignored in this declaration");
3942 else if (declspecs->specs[(int) ds_constexpr])
3943 error ("%<constexpr> cannot be used for type declarations");
3946 return declared_type;
3949 /* Called when a declaration is seen that contains no names to declare.
3950 If its type is a reference to a structure, union or enum inherited
3951 from a containing scope, shadow that tag name for the current scope
3952 with a forward reference.
3953 If its type defines a new named structure or union
3954 or defines an enum, it is valid but we need not do anything here.
3955 Otherwise, it is an error.
3957 C++: may have to grok the declspecs to learn about static,
3958 complain for anonymous unions.
3960 Returns the TYPE declared -- or NULL_TREE if none. */
3963 shadow_tag (cp_decl_specifier_seq *declspecs)
3965 tree t = check_tag_decl (declspecs);
3970 if (declspecs->attributes)
3972 warning (0, "attribute ignored in declaration of %q+#T", t);
3973 warning (0, "attribute for %q+#T must follow the %qs keyword",
3974 t, class_key_or_enum_as_string (t));
3978 if (maybe_process_partial_specialization (t) == error_mark_node)
3981 /* This is where the variables in an anonymous union are
3982 declared. An anonymous union declaration looks like:
3984 because there is no declarator after the union, the parser
3985 sends that declaration here. */
3986 if (ANON_AGGR_TYPE_P (t))
3988 fixup_anonymous_aggr (t);
3990 if (TYPE_FIELDS (t))
3992 tree decl = grokdeclarator (/*declarator=*/NULL,
3993 declspecs, NORMAL, 0, NULL);
3994 finish_anon_union (decl);
4001 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4004 groktypename (cp_decl_specifier_seq *type_specifiers,
4005 const cp_declarator *declarator,
4006 bool is_template_arg)
4010 enum decl_context context
4011 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4012 attrs = type_specifiers->attributes;
4013 type_specifiers->attributes = NULL_TREE;
4014 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4015 if (attrs && type != error_mark_node)
4017 if (CLASS_TYPE_P (type))
4018 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4019 "outside of definition", type);
4020 else if (MAYBE_CLASS_TYPE_P (type))
4021 /* A template type parameter or other dependent type. */
4022 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4023 "type %qT without an associated declaration", type);
4025 cplus_decl_attributes (&type, attrs, 0);
4030 /* Process a DECLARATOR for a function-scope variable declaration,
4031 namespace-scope variable declaration, or function declaration.
4032 (Function definitions go through start_function; class member
4033 declarations appearing in the body of the class go through
4034 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4035 If an error occurs, the error_mark_node is returned instead.
4037 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4038 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4039 for an explicitly defaulted function, or SD_DELETED for an explicitly
4040 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4041 implicitly initialized via a default constructor. ATTRIBUTES and
4042 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4043 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4044 set, the caller is responsible for calling pop_scope. */
4047 start_decl (const cp_declarator *declarator,
4048 cp_decl_specifier_seq *declspecs,
4051 tree prefix_attributes,
4052 tree *pushed_scope_p)
4060 *pushed_scope_p = NULL_TREE;
4062 /* An object declared as __attribute__((deprecated)) suppresses
4063 warnings of uses of other deprecated items. */
4064 if (lookup_attribute ("deprecated", attributes))
4065 deprecated_state = DEPRECATED_SUPPRESS;
4067 attributes = chainon (attributes, prefix_attributes);
4069 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4072 deprecated_state = DEPRECATED_NORMAL;
4074 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4075 || decl == error_mark_node)
4076 return error_mark_node;
4078 type = TREE_TYPE (decl);
4080 context = DECL_CONTEXT (decl);
4084 *pushed_scope_p = push_scope (context);
4086 /* We are only interested in class contexts, later. */
4087 if (TREE_CODE (context) == NAMESPACE_DECL)
4088 context = NULL_TREE;
4092 /* Is it valid for this decl to have an initializer at all?
4093 If not, set INITIALIZED to zero, which will indirectly
4094 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4095 switch (TREE_CODE (decl))
4098 error ("typedef %qD is initialized (use decltype instead)", decl);
4099 return error_mark_node;
4102 if (initialized == SD_DELETED)
4103 /* We'll handle the rest of the semantics later, but we need to
4104 set this now so it's visible to duplicate_decls. */
4105 DECL_DELETED_FN (decl) = 1;
4114 if (! toplevel_bindings_p ()
4115 && DECL_EXTERNAL (decl))
4116 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4118 DECL_EXTERNAL (decl) = 0;
4119 if (toplevel_bindings_p ())
4120 TREE_STATIC (decl) = 1;
4123 /* If this is a typedef that names the class for linkage purposes
4124 (7.1.3p8), apply any attributes directly to the type. */
4125 if (TREE_CODE (decl) == TYPE_DECL
4126 && TAGGED_TYPE_P (TREE_TYPE (decl))
4127 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4128 flags = ATTR_FLAG_TYPE_IN_PLACE;
4132 /* Set attributes here so if duplicate decl, will have proper attributes. */
4133 cplus_decl_attributes (&decl, attributes, flags);
4135 /* Dllimported symbols cannot be defined. Static data members (which
4136 can be initialized in-class and dllimported) go through grokfield,
4137 not here, so we don't need to exclude those decls when checking for
4139 if (initialized && DECL_DLLIMPORT_P (decl))
4141 error ("definition of %q#D is marked %<dllimport%>", decl);
4142 DECL_DLLIMPORT_P (decl) = 0;
4145 /* If #pragma weak was used, mark the decl weak now. */
4146 maybe_apply_pragma_weak (decl);
4148 if (TREE_CODE (decl) == FUNCTION_DECL
4149 && DECL_DECLARED_INLINE_P (decl)
4150 && DECL_UNINLINABLE (decl)
4151 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4152 warning (0, "inline function %q+D given attribute noinline", decl);
4154 if (context && COMPLETE_TYPE_P (complete_type (context)))
4156 if (TREE_CODE (decl) == VAR_DECL)
4158 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4159 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4160 error ("%q#D is not a static member of %q#T", decl, context);
4163 if (DECL_CONTEXT (field) != context)
4165 if (!same_type_p (DECL_CONTEXT (field), context))
4166 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4167 "to be defined as %<%T::%D%>",
4168 DECL_CONTEXT (field), DECL_NAME (decl),
4169 context, DECL_NAME (decl));
4170 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4172 if (processing_specialization
4173 && template_class_depth (context) == 0
4174 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4175 error ("template header not allowed in member definition "
4176 "of explicitly specialized class");
4177 /* Static data member are tricky; an in-class initialization
4178 still doesn't provide a definition, so the in-class
4179 declaration will have DECL_EXTERNAL set, but will have an
4180 initialization. Thus, duplicate_decls won't warn
4181 about this situation, and so we check here. */
4182 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4183 error ("duplicate initialization of %qD", decl);
4184 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4186 if (declspecs->specs[(int) ds_constexpr]
4187 && !DECL_DECLARED_CONSTEXPR_P (field))
4188 error ("%qD declared %<constexpr%> outside its class", field);
4193 tree field = check_classfn (context, decl,
4194 (processing_template_decl
4195 > template_class_depth (context))
4196 ? current_template_parms
4198 if (field && field != error_mark_node
4199 && duplicate_decls (decl, field,
4200 /*newdecl_is_friend=*/false))
4204 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4205 DECL_IN_AGGR_P (decl) = 0;
4206 /* Do not mark DECL as an explicit specialization if it was not
4207 already marked as an instantiation; a declaration should
4208 never be marked as a specialization unless we know what
4209 template is being specialized. */
4210 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4212 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4214 /* [temp.expl.spec] An explicit specialization of a static data
4215 member of a template is a definition if the declaration
4216 includes an initializer; otherwise, it is a declaration.
4218 We check for processing_specialization so this only applies
4219 to the new specialization syntax. */
4220 if (!initialized && processing_specialization)
4221 DECL_EXTERNAL (decl) = 1;
4224 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4225 permerror (input_location, "declaration of %q#D outside of class is not definition",
4228 if (!ensure_literal_type_for_constexpr_object (decl))
4229 return error_mark_node;
4232 was_public = TREE_PUBLIC (decl);
4234 /* Enter this declaration into the symbol table. */
4235 decl = maybe_push_decl (decl);
4237 if (processing_template_decl)
4238 decl = push_template_decl (decl);
4239 if (decl == error_mark_node)
4240 return error_mark_node;
4242 /* Tell the back end to use or not use .common as appropriate. If we say
4243 -fconserve-space, we want this to save .data space, at the expense of
4244 wrong semantics. If we say -fno-conserve-space, we want this to
4245 produce errors about redefs; to do this we force variables into the
4247 if (flag_conserve_space
4248 && TREE_CODE (decl) == VAR_DECL
4249 && TREE_PUBLIC (decl)
4250 && !DECL_THREAD_LOCAL_P (decl)
4251 && !have_global_bss_p ())
4252 DECL_COMMON (decl) = 1;
4254 if (TREE_CODE (decl) == VAR_DECL
4255 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4256 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4258 /* This is a const variable with implicit 'static'. Set
4259 DECL_THIS_STATIC so we can tell it from variables that are
4260 !TREE_PUBLIC because of the anonymous namespace. */
4261 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4262 DECL_THIS_STATIC (decl) = 1;
4265 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4266 start_decl_1 (decl, initialized);
4271 /* Process the declaration of a variable DECL. INITIALIZED is true
4272 iff DECL is explicitly initialized. (INITIALIZED is false if the
4273 variable is initialized via an implicitly-called constructor.)
4274 This function must be called for ordinary variables (including, for
4275 example, implicit instantiations of templates), but must not be
4276 called for template declarations. */
4279 start_decl_1 (tree decl, bool initialized)
4283 bool aggregate_definition_p;
4285 gcc_assert (!processing_template_decl);
4287 if (error_operand_p (decl))
4290 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4292 type = TREE_TYPE (decl);
4293 complete_p = COMPLETE_TYPE_P (type);
4294 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4296 /* If an explicit initializer is present, or if this is a definition
4297 of an aggregate, then we need a complete type at this point.
4298 (Scalars are always complete types, so there is nothing to
4299 check.) This code just sets COMPLETE_P; errors (if necessary)
4300 are issued below. */
4301 if ((initialized || aggregate_definition_p)
4303 && COMPLETE_TYPE_P (complete_type (type)))
4306 /* We will not yet have set TREE_READONLY on DECL if the type
4307 was "const", but incomplete, before this point. But, now, we
4308 have a complete type, so we can try again. */
4309 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4313 /* Is it valid for this decl to have an initializer at all? */
4315 /* Don't allow initializations for incomplete types except for
4316 arrays which might be completed by the initialization. */
4318 ; /* A complete type is ok. */
4319 else if (type_uses_auto (type))
4320 ; /* An auto type is ok. */
4321 else if (TREE_CODE (type) != ARRAY_TYPE)
4323 error ("variable %q#D has initializer but incomplete type", decl);
4324 type = TREE_TYPE (decl) = error_mark_node;
4326 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4328 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4329 error ("elements of array %q#D have incomplete type", decl);
4330 /* else we already gave an error in start_decl. */
4333 else if (aggregate_definition_p && !complete_p)
4335 if (type_uses_auto (type))
4336 error ("declaration of %q#D has no initializer", decl);
4338 error ("aggregate %q#D has incomplete type and cannot be defined",
4340 /* Change the type so that assemble_variable will give
4341 DECL an rtl we can live with: (mem (const_int 0)). */
4342 type = TREE_TYPE (decl) = error_mark_node;
4345 /* Create a new scope to hold this declaration if necessary.
4346 Whether or not a new scope is necessary cannot be determined
4347 until after the type has been completed; if the type is a
4348 specialization of a class template it is not until after
4349 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4350 will be set correctly. */
4351 maybe_push_cleanup_level (type);
4354 /* Handle initialization of references. DECL, TYPE, and INIT have the
4355 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4356 but will be set to a new CLEANUP_STMT if a temporary is created
4357 that must be destroyed subsequently.
4359 Returns an initializer expression to use to initialize DECL, or
4360 NULL if the initialization can be performed statically.
4362 Quotes on semantics can be found in ARM 8.4.3. */
4365 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4369 if (init == NULL_TREE)
4371 if ((DECL_LANG_SPECIFIC (decl) == 0
4372 || DECL_IN_AGGR_P (decl) == 0)
4373 && ! DECL_THIS_EXTERN (decl))
4374 error ("%qD declared as reference but not initialized", decl);
4378 if (TREE_CODE (init) == TREE_LIST)
4379 init = build_x_compound_expr_from_list (init, "initializer");
4381 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4382 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4383 /* Note: default conversion is only called in very special cases. */
4384 init = decay_conversion (init);
4386 /* Convert INIT to the reference type TYPE. This may involve the
4387 creation of a temporary, whose lifetime must be the same as that
4388 of the reference. If so, a DECL_EXPR for the temporary will be
4389 added just after the DECL_EXPR for DECL. That's why we don't set
4390 DECL_INITIAL for local references (instead assigning to them
4391 explicitly); we need to allow the temporary to be initialized
4393 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4395 if (tmp == error_mark_node)
4397 else if (tmp == NULL_TREE)
4399 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4403 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4406 DECL_INITIAL (decl) = tmp;
4411 /* Subroutine of check_initializer. We're initializing a DECL of
4412 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4413 extend the lifetime of the underlying array to match that of the decl,
4414 just like for reference initialization. CLEANUP is as for
4415 grok_reference_init. */
4418 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4420 tree aggr_init, array, arrtype;
4421 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4422 if (error_operand_p (init))
4423 return error_mark_node;
4425 aggr_init = TARGET_EXPR_INITIAL (init);
4426 init = build2 (INIT_EXPR, type, decl, init);
4428 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4429 arrtype = TREE_TYPE (array);
4431 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4432 array = TREE_OPERAND (array, 0);
4433 /* If the array is constant, finish_compound_literal already made it a
4434 static variable and we don't need to do anything here. */
4435 if (decl && TREE_CODE (array) == TARGET_EXPR)
4438 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4439 var = build_address (var);
4440 var = convert (arrtype, var);
4441 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4442 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4447 /* Designated initializers in arrays are not supported in GNU C++.
4448 The parser cannot detect this error since it does not know whether
4449 a given brace-enclosed initializer is for a class type or for an
4450 array. This function checks that CE does not use a designated
4451 initializer. If it does, an error is issued. Returns true if CE
4452 is valid, i.e., does not have a designated initializer. */
4455 check_array_designated_initializer (const constructor_elt *ce)
4457 /* Designated initializers for array elements are not supported. */
4460 /* The parser only allows identifiers as designated
4462 if (ce->index == error_mark_node)
4463 error ("name used in a GNU-style designated "
4464 "initializer for an array");
4467 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4468 error ("name %qD used in a GNU-style designated "
4469 "initializer for an array", ce->index);
4477 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4478 array until we finish parsing the initializer. If that's the
4479 situation we're in, update DECL accordingly. */
4482 maybe_deduce_size_from_array_init (tree decl, tree init)
4484 tree type = TREE_TYPE (decl);
4486 if (TREE_CODE (type) == ARRAY_TYPE
4487 && TYPE_DOMAIN (type) == NULL_TREE
4488 && TREE_CODE (decl) != TYPE_DECL)
4490 /* do_default is really a C-ism to deal with tentative definitions.
4491 But let's leave it here to ease the eventual merge. */
4492 int do_default = !DECL_EXTERNAL (decl);
4493 tree initializer = init ? init : DECL_INITIAL (decl);
4496 /* Check that there are no designated initializers in INIT, as
4497 those are not supported in GNU C++, and as the middle-end
4498 will crash if presented with a non-numeric designated
4500 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4502 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4503 constructor_elt *ce;
4506 VEC_iterate (constructor_elt, v, i, ce);
4508 if (!check_array_designated_initializer (ce))
4514 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4518 error ("initializer fails to determine size of %qD", decl);
4519 TREE_TYPE (decl) = error_mark_node;
4521 else if (failure == 2)
4525 error ("array size missing in %qD", decl);
4526 TREE_TYPE (decl) = error_mark_node;
4528 /* If a `static' var's size isn't known, make it extern as
4529 well as static, so it does not get allocated. If it's not
4530 `static', then don't mark it extern; finish_incomplete_decl
4531 will give it a default size and it will get allocated. */
4532 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4533 DECL_EXTERNAL (decl) = 1;
4535 else if (failure == 3)
4537 error ("zero-size array %qD", decl);
4538 TREE_TYPE (decl) = error_mark_node;
4542 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4544 relayout_decl (decl);
4548 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4549 any appropriate error messages regarding the layout. */
4552 layout_var_decl (tree decl)
4556 type = TREE_TYPE (decl);
4557 if (type == error_mark_node)
4560 /* If we haven't already layed out this declaration, do so now.
4561 Note that we must not call complete type for an external object
4562 because it's type might involve templates that we are not
4563 supposed to instantiate yet. (And it's perfectly valid to say
4564 `extern X x' for some incomplete type `X'.) */
4565 if (!DECL_EXTERNAL (decl))
4566 complete_type (type);
4567 if (!DECL_SIZE (decl)
4568 && TREE_TYPE (decl) != error_mark_node
4569 && (COMPLETE_TYPE_P (type)
4570 || (TREE_CODE (type) == ARRAY_TYPE
4571 && !TYPE_DOMAIN (type)
4572 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4573 layout_decl (decl, 0);
4575 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4577 /* An automatic variable with an incomplete type: that is an error.
4578 Don't talk about array types here, since we took care of that
4579 message in grokdeclarator. */
4580 error ("storage size of %qD isn't known", decl);
4581 TREE_TYPE (decl) = error_mark_node;
4584 /* Keep this code around in case we later want to control debug info
4585 based on whether a type is "used". (jason 1999-11-11) */
4587 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4588 /* Let debugger know it should output info for this type. */
4589 note_debug_info_needed (ttype);
4591 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4592 note_debug_info_needed (DECL_CONTEXT (decl));
4595 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4596 && DECL_SIZE (decl) != NULL_TREE
4597 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4599 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4600 constant_expression_warning (DECL_SIZE (decl));
4603 error ("storage size of %qD isn't constant", decl);
4604 TREE_TYPE (decl) = error_mark_node;
4609 /* If a local static variable is declared in an inline function, or if
4610 we have a weak definition, we must endeavor to create only one
4611 instance of the variable at link-time. */
4614 maybe_commonize_var (tree decl)
4616 /* Static data in a function with comdat linkage also has comdat
4618 if (TREE_STATIC (decl)
4619 /* Don't mess with __FUNCTION__. */
4620 && ! DECL_ARTIFICIAL (decl)
4621 && DECL_FUNCTION_SCOPE_P (decl)
4622 && vague_linkage_fn_p (DECL_CONTEXT (decl)))
4626 /* With weak symbols, we simply make the variable COMDAT;
4627 that will cause copies in multiple translations units to
4629 comdat_linkage (decl);
4633 if (DECL_INITIAL (decl) == NULL_TREE
4634 || DECL_INITIAL (decl) == error_mark_node)
4636 /* Without weak symbols, we can use COMMON to merge
4637 uninitialized variables. */
4638 TREE_PUBLIC (decl) = 1;
4639 DECL_COMMON (decl) = 1;
4643 /* While for initialized variables, we must use internal
4644 linkage -- which means that multiple copies will not
4646 TREE_PUBLIC (decl) = 0;
4647 DECL_COMMON (decl) = 0;
4648 warning_at (input_location, 0,
4649 "sorry: semantics of inline function static "
4650 "data %q+#D are wrong (you'll wind up "
4651 "with multiple copies)", decl);
4652 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4653 " you can work around this by removing "
4658 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4659 /* Set it up again; we might have set DECL_INITIAL since the last
4661 comdat_linkage (decl);
4664 /* Issue an error message if DECL is an uninitialized const variable. */
4667 check_for_uninitialized_const_var (tree decl)
4669 tree type = TREE_TYPE (decl);
4671 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
4672 && DECL_INITIAL (decl) == NULL)
4673 error ("missing initializer for constexpr %qD", decl);
4675 /* ``Unless explicitly declared extern, a const object does not have
4676 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4678 else if (TREE_CODE (decl) == VAR_DECL
4679 && TREE_CODE (type) != REFERENCE_TYPE
4680 && CP_TYPE_CONST_P (type)
4681 && !TYPE_NEEDS_CONSTRUCTING (type)
4682 && !DECL_INITIAL (decl))
4683 error ("uninitialized const %qD", decl);
4687 /* Structure holding the current initializer being processed by reshape_init.
4688 CUR is a pointer to the current element being processed, END is a pointer
4689 after the last element present in the initializer. */
4690 typedef struct reshape_iterator_t
4692 constructor_elt *cur;
4693 constructor_elt *end;
4696 static tree reshape_init_r (tree, reshape_iter *, bool);
4698 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4699 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4700 initialized. If there are no more such fields, the return value
4704 next_initializable_field (tree field)
4707 && (TREE_CODE (field) != FIELD_DECL
4708 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4709 || DECL_ARTIFICIAL (field)))
4710 field = TREE_CHAIN (field);
4715 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4716 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4717 INTEGER_CST representing the size of the array minus one (the maximum index),
4718 or NULL_TREE if the array was declared without specifying the size. D is
4719 the iterator within the constructor. */
4722 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4725 bool sized_array_p = (max_index != NULL_TREE);
4726 unsigned HOST_WIDE_INT max_index_cst = 0;
4727 unsigned HOST_WIDE_INT index;
4729 /* The initializer for an array is always a CONSTRUCTOR. */
4730 new_init = build_constructor (init_list_type_node, NULL);
4734 /* Minus 1 is used for zero sized arrays. */
4735 if (integer_all_onesp (max_index))
4738 if (host_integerp (max_index, 1))
4739 max_index_cst = tree_low_cst (max_index, 1);
4740 /* sizetype is sign extended, not zero extended. */
4742 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4746 /* Loop until there are no more initializers. */
4748 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4753 check_array_designated_initializer (d->cur);
4754 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4755 if (elt_init == error_mark_node)
4756 return error_mark_node;
4757 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4763 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4764 Parameters are the same of reshape_init_r. */
4767 reshape_init_array (tree type, reshape_iter *d)
4769 tree max_index = NULL_TREE;
4771 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4773 if (TYPE_DOMAIN (type))
4774 max_index = array_type_nelts (type);
4776 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4779 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4780 Parameters are the same of reshape_init_r. */
4783 reshape_init_vector (tree type, reshape_iter *d)
4785 tree max_index = NULL_TREE;
4788 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4790 if (COMPOUND_LITERAL_P (d->cur->value))
4792 tree value = d->cur->value;
4793 if (!same_type_p (TREE_TYPE (value), type))
4795 error ("invalid type %qT as initializer for a vector of type %qT",
4796 TREE_TYPE (d->cur->value), type);
4797 value = error_mark_node;
4803 /* For a vector, the representation type is a struct
4804 containing a single member which is an array of the
4805 appropriate size. */
4806 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4807 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4808 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4810 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4813 /* Subroutine of reshape_init_r, processes the initializers for classes
4814 or union. Parameters are the same of reshape_init_r. */
4817 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4822 gcc_assert (CLASS_TYPE_P (type));
4824 /* The initializer for a class is always a CONSTRUCTOR. */
4825 new_init = build_constructor (init_list_type_node, NULL);
4826 field = next_initializable_field (TYPE_FIELDS (type));
4832 An initializer for an aggregate member that is an
4833 empty class shall have the form of an empty
4834 initializer-list {}. */
4835 if (!first_initializer_p)
4837 error ("initializer for %qT must be brace-enclosed", type);
4838 return error_mark_node;
4843 /* Loop through the initializable fields, gathering initializers. */
4844 while (d->cur != d->end)
4848 /* Handle designated initializers, as an extension. */
4851 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4853 if (!field || TREE_CODE (field) != FIELD_DECL)
4855 error ("%qT has no non-static data member named %qD", type,
4857 return error_mark_node;
4861 /* If we processed all the member of the class, we are done. */
4865 field_init = reshape_init_r (TREE_TYPE (field), d,
4866 /*first_initializer_p=*/false);
4867 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4871 When a union is initialized with a brace-enclosed
4872 initializer, the braces shall only contain an
4873 initializer for the first member of the union. */
4874 if (TREE_CODE (type) == UNION_TYPE)
4877 field = next_initializable_field (TREE_CHAIN (field));
4883 /* Subroutine of reshape_init, which processes a single initializer (part of
4884 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4885 iterator within the CONSTRUCTOR which points to the initializer to process.
4886 FIRST_INITIALIZER_P is true if this is the first initializer of the
4887 outermost CONSTRUCTOR node. */
4890 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4892 tree init = d->cur->value;
4894 if (error_operand_p (init))
4895 return error_mark_node;
4897 /* A non-aggregate type is always initialized with a single
4899 if (!CP_AGGREGATE_TYPE_P (type))
4901 /* It is invalid to initialize a non-aggregate type with a
4902 brace-enclosed initializer before C++0x.
4903 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4904 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4905 a CONSTRUCTOR (with a record type). */
4906 if (TREE_CODE (init) == CONSTRUCTOR
4907 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4909 if (SCALAR_TYPE_P (type))
4911 error ("braces around scalar initializer for type %qT", type);
4912 init = error_mark_node;
4915 maybe_warn_cpp0x ("extended initializer lists");
4924 All implicit type conversions (clause _conv_) are considered when
4925 initializing the aggregate member with an initializer from an
4926 initializer-list. If the initializer can initialize a member,
4927 the member is initialized. Otherwise, if the member is itself a
4928 non-empty subaggregate, brace elision is assumed and the
4929 initializer is considered for the initialization of the first
4930 member of the subaggregate. */
4931 if (TREE_CODE (init) != CONSTRUCTOR
4932 /* But don't try this for the first initializer, since that would be
4933 looking through the outermost braces; A a2 = { a1 }; is not a
4934 valid aggregate initialization. */
4935 && !first_initializer_p
4936 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
4937 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
4943 /* [dcl.init.string]
4945 A char array (whether plain char, signed char, or unsigned char)
4946 can be initialized by a string-literal (optionally enclosed in
4947 braces); a wchar_t array can be initialized by a wide
4948 string-literal (optionally enclosed in braces). */
4949 if (TREE_CODE (type) == ARRAY_TYPE
4950 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4952 tree str_init = init;
4954 /* Strip one level of braces if and only if they enclose a single
4955 element (as allowed by [dcl.init.string]). */
4956 if (!first_initializer_p
4957 && TREE_CODE (str_init) == CONSTRUCTOR
4958 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4960 str_init = VEC_index (constructor_elt,
4961 CONSTRUCTOR_ELTS (str_init), 0)->value;
4964 /* If it's a string literal, then it's the initializer for the array
4965 as a whole. Otherwise, continue with normal initialization for
4966 array types (one value per array element). */
4967 if (TREE_CODE (str_init) == STRING_CST)
4974 /* The following cases are about aggregates. If we are not within a full
4975 initializer already, and there is not a CONSTRUCTOR, it means that there
4976 is a missing set of braces (that is, we are processing the case for
4977 which reshape_init exists). */
4978 if (!first_initializer_p)
4980 if (TREE_CODE (init) == CONSTRUCTOR)
4982 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4983 /* There is no need to reshape pointer-to-member function
4984 initializers, as they are always constructed correctly
4985 by the front end. */
4987 else if (COMPOUND_LITERAL_P (init))
4988 /* For a nested compound literal, there is no need to reshape since
4989 brace elision is not allowed. Even if we decided to allow it,
4990 we should add a call to reshape_init in finish_compound_literal,
4991 before calling digest_init, so changing this code would still
4992 not be necessary. */
4993 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4997 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4998 return reshape_init (type, init);
5002 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5006 /* Dispatch to specialized routines. */
5007 if (CLASS_TYPE_P (type))
5008 return reshape_init_class (type, d, first_initializer_p);
5009 else if (TREE_CODE (type) == ARRAY_TYPE)
5010 return reshape_init_array (type, d);
5011 else if (TREE_CODE (type) == VECTOR_TYPE)
5012 return reshape_init_vector (type, d);
5017 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5018 brace-enclosed aggregate initializer.
5020 INIT is the CONSTRUCTOR containing the list of initializers describing
5021 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5022 It may not presently match the shape of the TYPE; for example:
5024 struct S { int a; int b; };
5025 struct S a[] = { 1, 2, 3, 4 };
5027 Here INIT will hold a VEC of four elements, rather than a
5028 VEC of two elements, each itself a VEC of two elements. This
5029 routine transforms INIT from the former form into the latter. The
5030 revised CONSTRUCTOR node is returned. */
5033 reshape_init (tree type, tree init)
5035 VEC(constructor_elt, gc) *v;
5039 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5041 v = CONSTRUCTOR_ELTS (init);
5043 /* An empty constructor does not need reshaping, and it is always a valid
5045 if (VEC_empty (constructor_elt, v))
5048 /* Recurse on this CONSTRUCTOR. */
5049 d.cur = VEC_index (constructor_elt, v, 0);
5050 d.end = d.cur + VEC_length (constructor_elt, v);
5052 new_init = reshape_init_r (type, &d, true);
5053 if (new_init == error_mark_node)
5054 return error_mark_node;
5056 /* Make sure all the element of the constructor were used. Otherwise,
5057 issue an error about exceeding initializers. */
5059 error ("too many initializers for %qT", type);
5064 /* Verify array initializer. Returns true if errors have been reported. */
5067 check_array_initializer (tree decl, tree type, tree init)
5069 tree element_type = TREE_TYPE (type);
5071 /* The array type itself need not be complete, because the
5072 initializer may tell us how many elements are in the array.
5073 But, the elements of the array must be complete. */
5074 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5077 error ("elements of array %q#D have incomplete type", decl);
5079 error ("elements of array %q#T have incomplete type", type);
5082 /* It is not valid to initialize a VLA. */
5084 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5085 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5088 error ("variable-sized object %qD may not be initialized", decl);
5090 error ("variable-sized compound literal");
5096 /* Subroutine of check_initializer; args are passed down from that function.
5097 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5100 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5103 int saved_stmts_are_full_exprs_p = 0;
5104 if (building_stmt_tree ())
5106 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5107 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5109 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5110 if (building_stmt_tree ())
5111 current_stmt_tree ()->stmts_are_full_exprs_p =
5112 saved_stmts_are_full_exprs_p;
5116 /* Verify INIT (the initializer for DECL), and record the
5117 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5118 grok_reference_init.
5120 If the return value is non-NULL, it is an expression that must be
5121 evaluated dynamically to initialize DECL. */
5124 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5126 tree type = TREE_TYPE (decl);
5127 tree init_code = NULL;
5129 /* Things that are going to be initialized need to have complete
5131 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5133 if (type == error_mark_node)
5134 /* We will have already complained. */
5137 if (TREE_CODE (type) == ARRAY_TYPE)
5139 if (check_array_initializer (decl, type, init))
5142 else if (!COMPLETE_TYPE_P (type))
5144 error ("%qD has incomplete type", decl);
5145 TREE_TYPE (decl) = error_mark_node;
5149 /* There is no way to make a variable-sized class type in GNU C++. */
5150 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5152 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5154 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5155 if (SCALAR_TYPE_P (type))
5159 maybe_warn_cpp0x ("extended initializer lists");
5160 init = build_zero_init (type, NULL_TREE, false);
5162 else if (init_len != 1)
5164 error ("scalar object %qD requires one element in initializer",
5166 TREE_TYPE (decl) = error_mark_node;
5172 if (TREE_CODE (decl) == CONST_DECL)
5174 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5176 DECL_INITIAL (decl) = init;
5178 gcc_assert (init != NULL_TREE);
5181 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5182 init = grok_reference_init (decl, type, init, cleanup);
5185 /* Do not reshape constructors of vectors (they don't need to be
5187 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5189 if (is_std_init_list (type))
5190 return build_init_list_var_init (decl, type, init, cleanup);
5191 else if (TYPE_NON_AGGREGATE_CLASS (type))
5193 /* Don't reshape if the class has constructors. */
5194 if (cxx_dialect == cxx98)
5195 error ("in C++98 %qD must be initialized by constructor, "
5198 init = build_tree_list (NULL_TREE, init);
5200 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5202 error ("opaque vector types cannot be initialized");
5203 init = error_mark_node;
5206 init = reshape_init (type, init);
5209 /* If DECL has an array type without a specific bound, deduce the
5210 array size from the initializer. */
5211 maybe_deduce_size_from_array_init (decl, init);
5212 type = TREE_TYPE (decl);
5213 if (type == error_mark_node)
5216 if (TYPE_NEEDS_CONSTRUCTING (type)
5217 || (CLASS_TYPE_P (type)
5218 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5219 return build_aggr_init_full_exprs (decl, init, flags);
5220 else if (TREE_CODE (init) != TREE_VEC)
5222 init_code = store_init_value (decl, init, flags);
5223 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5224 && DECL_INITIAL (decl)
5225 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5226 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5227 warning (0, "array %qD initialized by parenthesized string literal %qE",
5228 decl, DECL_INITIAL (decl));
5232 else if (DECL_EXTERNAL (decl))
5234 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5235 return build_aggr_init_full_exprs (decl, init, flags);
5236 else if (MAYBE_CLASS_TYPE_P (type))
5238 tree core_type = strip_array_types (type);
5240 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5241 error ("structure %qD with uninitialized const members", decl);
5242 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5243 error ("structure %qD with uninitialized reference members", decl);
5245 check_for_uninitialized_const_var (decl);
5248 check_for_uninitialized_const_var (decl);
5250 if (init && init != error_mark_node)
5251 init_code = build2 (INIT_EXPR, type, decl, init);
5256 /* If DECL is not a local variable, give it RTL. */
5259 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5261 int toplev = toplevel_bindings_p ();
5263 const char *filename;
5265 /* Set the DECL_ASSEMBLER_NAME for the object. */
5268 /* The `register' keyword, when used together with an
5269 asm-specification, indicates that the variable should be
5270 placed in a particular register. */
5271 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5273 set_user_assembler_name (decl, asmspec);
5274 DECL_HARD_REGISTER (decl) = 1;
5278 if (TREE_CODE (decl) == FUNCTION_DECL
5279 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5280 set_builtin_user_assembler_name (decl, asmspec);
5281 set_user_assembler_name (decl, asmspec);
5285 /* Handle non-variables up front. */
5286 if (TREE_CODE (decl) != VAR_DECL)
5288 rest_of_decl_compilation (decl, toplev, at_eof);
5292 /* If we see a class member here, it should be a static data
5294 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5296 gcc_assert (TREE_STATIC (decl));
5297 /* An in-class declaration of a static data member should be
5298 external; it is only a declaration, and not a definition. */
5299 if (init == NULL_TREE)
5300 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5303 /* We don't create any RTL for local variables. */
5304 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5307 /* We defer emission of local statics until the corresponding
5308 DECL_EXPR is expanded. */
5309 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5311 /* We try to defer namespace-scope static constants so that they are
5312 not emitted into the object file unnecessarily. */
5313 filename = input_filename;
5314 if (!DECL_VIRTUAL_P (decl)
5315 && TREE_READONLY (decl)
5316 && DECL_INITIAL (decl) != NULL_TREE
5317 && DECL_INITIAL (decl) != error_mark_node
5319 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5321 && !TREE_PUBLIC (decl))
5323 /* Fool with the linkage of static consts according to #pragma
5325 struct c_fileinfo *finfo = get_fileinfo (filename);
5326 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5328 TREE_PUBLIC (decl) = 1;
5329 DECL_EXTERNAL (decl) = finfo->interface_only;
5334 /* Likewise for template instantiations. */
5335 else if (DECL_LANG_SPECIFIC (decl)
5336 && DECL_IMPLICIT_INSTANTIATION (decl))
5339 /* If we're not deferring, go ahead and assemble the variable. */
5341 rest_of_decl_compilation (decl, toplev, at_eof);
5344 /* walk_tree helper for wrap_temporary_cleanups, below. */
5347 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5349 if (TYPE_P (*stmt_p))
5355 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5357 tree guard = (tree)data;
5358 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5360 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5361 /* Tell honor_protect_cleanup_actions to handle this as a separate
5363 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5365 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5371 /* We're initializing a local variable which has a cleanup GUARD. If there
5372 are any temporaries used in the initializer INIT of this variable, we
5373 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5374 variable will be cleaned up properly if one of them throws.
5376 Unfortunately, there's no way to express this properly in terms of
5377 nesting, as the regions for the temporaries overlap the region for the
5378 variable itself; if there are two temporaries, the variable needs to be
5379 the first thing destroyed if either of them throws. However, we only
5380 want to run the variable's cleanup if it actually got constructed. So
5381 we need to guard the temporary cleanups with the variable's cleanup if
5382 they are run on the normal path, but not if they are run on the
5383 exceptional path. We implement this by telling
5384 honor_protect_cleanup_actions to strip the variable cleanup from the
5385 exceptional path. */
5388 wrap_temporary_cleanups (tree init, tree guard)
5390 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5393 /* Generate code to initialize DECL (a local variable). */
5396 initialize_local_var (tree decl, tree init)
5398 tree type = TREE_TYPE (decl);
5402 gcc_assert (TREE_CODE (decl) == VAR_DECL
5403 || TREE_CODE (decl) == RESULT_DECL);
5404 gcc_assert (!TREE_STATIC (decl));
5406 if (DECL_SIZE (decl) == NULL_TREE)
5408 /* If we used it already as memory, it must stay in memory. */
5409 DECL_INITIAL (decl) = NULL_TREE;
5410 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5414 if (type == error_mark_node)
5417 /* Compute and store the initial value. */
5418 already_used = TREE_USED (decl) || TREE_USED (type);
5420 /* Generate a cleanup, if necessary. */
5421 cleanup = cxx_maybe_build_cleanup (decl);
5423 /* Perform the initialization. */
5426 int saved_stmts_are_full_exprs_p;
5428 /* If we're only initializing a single object, guard the destructors
5429 of any temporaries used in its initializer with its destructor.
5430 This isn't right for arrays because each element initialization is
5431 a full-expression. */
5432 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5433 wrap_temporary_cleanups (init, cleanup);
5435 gcc_assert (building_stmt_tree ());
5436 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5437 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5438 finish_expr_stmt (init);
5439 current_stmt_tree ()->stmts_are_full_exprs_p =
5440 saved_stmts_are_full_exprs_p;
5443 /* Set this to 0 so we can tell whether an aggregate which was
5444 initialized was ever used. Don't do this if it has a
5445 destructor, so we don't complain about the 'resource
5446 allocation is initialization' idiom. Now set
5447 attribute((unused)) on types so decls of that type will be
5448 marked used. (see TREE_USED, above.) */
5449 if (TYPE_NEEDS_CONSTRUCTING (type)
5451 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5452 && DECL_NAME (decl))
5453 TREE_USED (decl) = 0;
5454 else if (already_used)
5455 TREE_USED (decl) = 1;
5458 finish_decl_cleanup (decl, cleanup);
5461 /* DECL is a VAR_DECL for a compiler-generated variable with static
5462 storage duration (like a virtual table) whose initializer is a
5463 compile-time constant. INIT must be either a TREE_LIST of values,
5464 or a CONSTRUCTOR. Initialize the variable and provide it to the
5468 initialize_artificial_var (tree decl, tree init)
5470 gcc_assert (DECL_ARTIFICIAL (decl));
5471 if (TREE_CODE (init) == TREE_LIST)
5472 init = build_constructor_from_list (TREE_TYPE (decl), init);
5473 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5474 DECL_INITIAL (decl) = init;
5475 DECL_INITIALIZED_P (decl) = 1;
5476 determine_visibility (decl);
5477 layout_var_decl (decl);
5478 maybe_commonize_var (decl);
5479 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5482 /* INIT is the initializer for a variable, as represented by the
5483 parser. Returns true iff INIT is value-dependent. */
5486 value_dependent_init_p (tree init)
5488 if (TREE_CODE (init) == TREE_LIST)
5489 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5490 return any_value_dependent_elements_p (init);
5491 else if (TREE_CODE (init) == CONSTRUCTOR)
5492 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5494 VEC(constructor_elt, gc) *elts;
5498 elts = CONSTRUCTOR_ELTS (init);
5499 nelts = VEC_length (constructor_elt, elts);
5500 for (i = 0; i < nelts; ++i)
5501 if (value_dependent_init_p (VEC_index (constructor_elt,
5506 /* It must be a simple expression, e.g., int i = 3; */
5507 return value_dependent_expression_p (init);
5512 /* Finish processing of a declaration;
5513 install its line number and initial value.
5514 If the length of an array type is not known before,
5515 it must be determined now, from the initial value, or it is an error.
5517 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5518 true, then INIT is an integral constant expression.
5520 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5521 if the (init) syntax was used. */
5524 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5525 tree asmspec_tree, int flags)
5529 const char *asmspec = NULL;
5530 int was_readonly = 0;
5531 bool var_definition_p = false;
5532 int saved_processing_template_decl;
5535 if (decl == error_mark_node)
5540 error ("assignment (not initialization) in declaration");
5544 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5545 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5546 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5548 type = TREE_TYPE (decl);
5549 if (type == error_mark_node)
5552 /* Assume no cleanup is required. */
5553 cleanup = NULL_TREE;
5554 saved_processing_template_decl = processing_template_decl;
5556 /* If a name was specified, get the string. */
5557 if (global_scope_p (current_binding_level))
5558 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5559 if (asmspec_tree && asmspec_tree != error_mark_node)
5560 asmspec = TREE_STRING_POINTER (asmspec_tree);
5562 if (current_class_type
5563 && CP_DECL_CONTEXT (decl) == current_class_type
5564 && TYPE_BEING_DEFINED (current_class_type)
5565 && (DECL_INITIAL (decl) || init))
5566 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5568 auto_node = type_uses_auto (type);
5571 if (init == NULL_TREE)
5573 error ("declaration of %q#D has no initializer", decl);
5574 TREE_TYPE (decl) = error_mark_node;
5577 if (TREE_CODE (init) == TREE_LIST)
5578 init = build_x_compound_expr_from_list (init, "initializer");
5579 if (describable_type (init))
5581 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5582 if (type == error_mark_node)
5587 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5590 if (init == ridpointers[(int)RID_DELETE])
5592 /* FIXME check this is 1st decl. */
5593 DECL_DELETED_FN (decl) = 1;
5594 DECL_DECLARED_INLINE_P (decl) = 1;
5595 DECL_INITIAL (decl) = error_mark_node;
5596 FOR_EACH_CLONE (clone, decl)
5598 DECL_DELETED_FN (clone) = 1;
5599 DECL_DECLARED_INLINE_P (clone) = 1;
5600 DECL_INITIAL (clone) = error_mark_node;
5604 else if (init == ridpointers[(int)RID_DEFAULT])
5606 if (defaultable_fn_check (decl))
5607 DECL_DEFAULTED_FN (decl) = 1;
5609 DECL_INITIAL (decl) = NULL_TREE;
5613 if (processing_template_decl)
5615 bool type_dependent_p;
5617 /* Add this declaration to the statement-tree. */
5618 if (at_function_scope_p ())
5619 add_decl_expr (decl);
5621 type_dependent_p = dependent_type_p (type);
5623 if (check_for_bare_parameter_packs (init))
5626 DECL_INITIAL (decl) = NULL_TREE;
5629 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5631 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5632 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5633 TREE_CONSTANT (decl) = 1;
5636 /* Generally, initializers in templates are expanded when the
5637 template is instantiated. But, if DECL is an integral
5638 constant static data member, then it can be used in future
5639 integral constant expressions, and its value must be
5642 && DECL_CLASS_SCOPE_P (decl)
5643 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5644 && !type_dependent_p
5645 && !value_dependent_init_p (init)))
5648 DECL_INITIAL (decl) = init;
5649 if (TREE_CODE (decl) == VAR_DECL
5650 && !DECL_PRETTY_FUNCTION_P (decl)
5651 && !type_dependent_p)
5652 maybe_deduce_size_from_array_init (decl, init);
5656 if (TREE_CODE (init) == TREE_LIST)
5658 /* If the parenthesized-initializer form was used (e.g.,
5659 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5660 arguments. (There is generally only one.) We convert them
5663 for (; list; list = TREE_CHAIN (list))
5665 tree elt = TREE_VALUE (list);
5666 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5670 init = fold_non_dependent_expr (init);
5671 processing_template_decl = 0;
5674 /* Take care of TYPE_DECLs up front. */
5675 if (TREE_CODE (decl) == TYPE_DECL)
5677 if (type != error_mark_node
5678 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5680 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5681 warning (0, "shadowing previous type declaration of %q#D", decl);
5682 set_identifier_type_value (DECL_NAME (decl), decl);
5685 /* If we have installed this as the canonical typedef for this
5686 type, and that type has not been defined yet, delay emitting
5687 the debug information for it, as we will emit it later. */
5688 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5689 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5690 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5692 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5697 /* A reference will be modified here, as it is initialized. */
5698 if (! DECL_EXTERNAL (decl)
5699 && TREE_READONLY (decl)
5700 && TREE_CODE (type) == REFERENCE_TYPE)
5703 TREE_READONLY (decl) = 0;
5706 if (TREE_CODE (decl) == VAR_DECL)
5708 /* Only variables with trivial initialization and destruction can
5709 have thread-local storage. */
5710 if (DECL_THREAD_LOCAL_P (decl)
5711 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5712 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5713 error ("%qD cannot be thread-local because it has non-trivial "
5714 "type %qT", decl, TREE_TYPE (decl));
5715 /* If this is a local variable that will need a mangled name,
5716 register it now. We must do this before processing the
5717 initializer for the variable, since the initialization might
5718 require a guard variable, and since the mangled name of the
5719 guard variable will depend on the mangled name of this
5721 if (DECL_FUNCTION_SCOPE_P (decl)
5722 && TREE_STATIC (decl)
5723 && !DECL_ARTIFICIAL (decl))
5724 push_local_name (decl);
5725 /* Convert the initializer to the type of DECL, if we have not
5726 already initialized DECL. */
5727 if (!DECL_INITIALIZED_P (decl)
5728 /* If !DECL_EXTERNAL then DECL is being defined. In the
5729 case of a static data member initialized inside the
5730 class-specifier, there can be an initializer even if DECL
5731 is *not* defined. */
5732 && (!DECL_EXTERNAL (decl) || init))
5734 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5737 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5738 /* Allow libjava/prims.cc define primitive classes. */
5739 if (init != NULL_TREE
5740 || jclass == NULL_TREE
5741 || TREE_CODE (jclass) != TYPE_DECL
5742 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5743 || !same_type_ignoring_top_level_qualifiers_p
5744 (type, TREE_TYPE (TREE_TYPE (jclass))))
5745 error ("Java object %qD not allocated with %<new%>", decl);
5750 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5751 if (init_const_expr_p)
5753 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5754 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5755 TREE_CONSTANT (decl) = 1;
5758 init = check_initializer (decl, init, flags, &cleanup);
5759 /* Thread-local storage cannot be dynamically initialized. */
5760 if (DECL_THREAD_LOCAL_P (decl) && init)
5762 error ("%qD is thread-local and so cannot be dynamically "
5763 "initialized", decl);
5767 /* Check that the initializer for a static data member was a
5768 constant. Although we check in the parser that the
5769 initializer is an integral constant expression, we do not
5770 simplify division-by-zero at the point at which it
5771 occurs. Therefore, in:
5773 struct S { static const int i = 7 / 0; };
5775 we issue an error at this point. It would
5776 probably be better to forbid division by zero in
5777 integral constant expressions. */
5778 if (DECL_EXTERNAL (decl) && init)
5780 error ("%qD cannot be initialized by a non-constant expression"
5781 " when being declared", decl);
5782 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5790 The memory occupied by any object of static storage
5791 duration is zero-initialized at program startup before
5792 any other initialization takes place.
5794 We cannot create an appropriate initializer until after
5795 the type of DECL is finalized. If DECL_INITIAL is set,
5796 then the DECL is statically initialized, and any
5797 necessary zero-initialization has already been performed. */
5798 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5799 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5800 /*nelts=*/NULL_TREE,
5801 /*static_storage_p=*/true);
5802 /* Remember that the initialization for this variable has
5804 DECL_INITIALIZED_P (decl) = 1;
5805 /* This declaration is the definition of this variable,
5806 unless we are initializing a static data member within
5807 the class specifier. */
5808 if (!DECL_EXTERNAL (decl))
5809 var_definition_p = true;
5811 /* If the variable has an array type, lay out the type, even if
5812 there is no initializer. It is valid to index through the
5813 array, and we must get TYPE_ALIGN set correctly on the array
5815 else if (TREE_CODE (type) == ARRAY_TYPE)
5818 if (!processing_template_decl
5819 && TREE_STATIC (decl)
5820 && !at_function_scope_p ()
5821 && current_function_decl == NULL)
5822 /* So decl is a global variable or a static member of a
5823 non local class. Record the types it uses
5824 so that we can decide later to emit debug info for them. */
5825 record_types_used_by_current_var_decl (decl);
5827 else if (TREE_CODE (decl) == FIELD_DECL
5828 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5829 error ("non-static data member %qD has Java class type", decl);
5831 /* Add this declaration to the statement-tree. This needs to happen
5832 after the call to check_initializer so that the DECL_EXPR for a
5833 reference temp is added before the DECL_EXPR for the reference itself. */
5834 if (at_function_scope_p ())
5835 add_decl_expr (decl);
5837 /* Let the middle end know about variables and functions -- but not
5838 static data members in uninstantiated class templates. */
5839 if (!saved_processing_template_decl
5840 && (TREE_CODE (decl) == VAR_DECL
5841 || TREE_CODE (decl) == FUNCTION_DECL))
5843 if (TREE_CODE (decl) == VAR_DECL)
5845 layout_var_decl (decl);
5846 maybe_commonize_var (decl);
5849 /* This needs to happen after the linkage is set. */
5850 determine_visibility (decl);
5852 if (var_definition_p && TREE_STATIC (decl))
5854 /* If a TREE_READONLY variable needs initialization
5855 at runtime, it is no longer readonly and we need to
5856 avoid MEM_READONLY_P being set on RTL created for it. */
5859 if (TREE_READONLY (decl))
5860 TREE_READONLY (decl) = 0;
5863 else if (was_readonly)
5864 TREE_READONLY (decl) = 1;
5867 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5869 /* Check for abstractness of the type. Notice that there is no
5870 need to strip array types here since the check for those types
5871 is already done within create_array_type_for_decl. */
5872 if (TREE_CODE (type) == FUNCTION_TYPE
5873 || TREE_CODE (type) == METHOD_TYPE)
5874 abstract_virtuals_error (decl, TREE_TYPE (type));
5876 abstract_virtuals_error (decl, type);
5878 if (TREE_TYPE (decl) == error_mark_node)
5879 /* No initialization required. */
5881 else if (TREE_CODE (decl) == FUNCTION_DECL)
5885 if (init == ridpointers[(int)RID_DEFAULT])
5887 /* An out-of-class default definition is defined at
5888 the point where it is explicitly defaulted. */
5889 if (DECL_INITIAL (decl) == error_mark_node)
5890 synthesize_method (decl);
5893 error ("function %q#D is initialized like a variable", decl);
5895 /* else no initialization required. */
5897 else if (DECL_EXTERNAL (decl)
5898 && ! (DECL_LANG_SPECIFIC (decl)
5899 && DECL_NOT_REALLY_EXTERN (decl)))
5902 DECL_INITIAL (decl) = init;
5904 /* A variable definition. */
5905 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5906 /* Initialize the local variable. */
5907 initialize_local_var (decl, init);
5909 /* If a variable is defined, and then a subsequent
5910 definition with external linkage is encountered, we will
5911 get here twice for the same variable. We want to avoid
5912 calling expand_static_init more than once. For variables
5913 that are not static data members, we can call
5914 expand_static_init only when we actually process the
5915 initializer. It is not legal to redeclare a static data
5916 member, so this issue does not arise in that case. */
5917 else if (var_definition_p && TREE_STATIC (decl))
5918 expand_static_init (decl, init);
5921 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5922 reference, insert it in the statement-tree now. */
5924 push_cleanup (decl, cleanup, false);
5927 processing_template_decl = saved_processing_template_decl;
5930 TREE_READONLY (decl) = 1;
5932 /* If this was marked 'used', be sure it will be output. */
5933 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5934 mark_decl_referenced (decl);
5937 /* Returns a declaration for a VAR_DECL as if:
5939 extern "C" TYPE NAME;
5941 had been seen. Used to create compiler-generated global
5945 declare_global_var (tree name, tree type)
5949 push_to_top_level ();
5950 decl = build_decl (input_location, VAR_DECL, name, type);
5951 TREE_PUBLIC (decl) = 1;
5952 DECL_EXTERNAL (decl) = 1;
5953 DECL_ARTIFICIAL (decl) = 1;
5954 /* If the user has explicitly declared this variable (perhaps
5955 because the code we are compiling is part of a low-level runtime
5956 library), then it is possible that our declaration will be merged
5957 with theirs by pushdecl. */
5958 decl = pushdecl (decl);
5959 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
5960 pop_from_top_level ();
5965 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5966 if "__cxa_atexit" is not being used) corresponding to the function
5967 to be called when the program exits. */
5970 get_atexit_fn_ptr_type (void)
5975 if (!atexit_fn_ptr_type_node)
5977 if (flag_use_cxa_atexit
5978 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5979 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5980 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5982 /* The parameter to "atexit" is "void (*)(void)". */
5983 arg_types = void_list_node;
5985 fn_type = build_function_type (void_type_node, arg_types);
5986 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5989 return atexit_fn_ptr_type_node;
5992 /* Returns a pointer to the `atexit' function. Note that if
5993 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5994 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5997 get_atexit_node (void)
6004 bool use_aeabi_atexit;
6009 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6011 /* The declaration for `__cxa_atexit' is:
6013 int __cxa_atexit (void (*)(void *), void *, void *)
6015 We build up the argument types and then then function type
6018 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6019 /* First, build the pointer-to-function type for the first
6021 fn_ptr_type = get_atexit_fn_ptr_type ();
6022 /* Then, build the rest of the argument types. */
6023 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6024 if (use_aeabi_atexit)
6026 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6027 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6031 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6032 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6034 /* And the final __cxa_atexit type. */
6035 fn_type = build_function_type (integer_type_node, arg_types);
6036 fn_ptr_type = build_pointer_type (fn_type);
6037 if (use_aeabi_atexit)
6038 name = "__aeabi_atexit";
6040 name = "__cxa_atexit";
6044 /* The declaration for `atexit' is:
6046 int atexit (void (*)());
6048 We build up the argument types and then then function type
6050 fn_ptr_type = get_atexit_fn_ptr_type ();
6051 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
6052 /* Build the final atexit type. */
6053 fn_type = build_function_type (integer_type_node, arg_types);
6057 /* Now, build the function declaration. */
6058 push_lang_context (lang_name_c);
6059 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6060 mark_used (atexit_fndecl);
6061 pop_lang_context ();
6062 atexit_node = decay_conversion (atexit_fndecl);
6067 /* Returns the __dso_handle VAR_DECL. */
6070 get_dso_handle_node (void)
6072 if (dso_handle_node)
6073 return dso_handle_node;
6075 /* Declare the variable. */
6076 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6079 return dso_handle_node;
6082 /* Begin a new function with internal linkage whose job will be simply
6083 to destroy some particular variable. */
6085 static GTY(()) int start_cleanup_cnt;
6088 start_cleanup_fn (void)
6093 bool use_cxa_atexit = flag_use_cxa_atexit
6094 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6096 push_to_top_level ();
6098 /* No need to mangle this. */
6099 push_lang_context (lang_name_c);
6101 /* Build the name of the function. */
6102 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6103 /* Build the function declaration. */
6104 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6105 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6106 /* It's a function with internal linkage, generated by the
6108 TREE_PUBLIC (fndecl) = 0;
6109 DECL_ARTIFICIAL (fndecl) = 1;
6110 /* Make the function `inline' so that it is only emitted if it is
6111 actually needed. It is unlikely that it will be inlined, since
6112 it is only called via a function pointer, but we avoid unnecessary
6113 emissions this way. */
6114 DECL_DECLARED_INLINE_P (fndecl) = 1;
6115 DECL_INTERFACE_KNOWN (fndecl) = 1;
6116 /* Build the parameter. */
6121 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6122 DECL_CONTEXT (parmdecl) = fndecl;
6123 TREE_USED (parmdecl) = 1;
6124 DECL_ARGUMENTS (fndecl) = parmdecl;
6128 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6130 pop_lang_context ();
6132 return current_function_decl;
6135 /* Finish the cleanup function begun by start_cleanup_fn. */
6138 end_cleanup_fn (void)
6140 expand_or_defer_fn (finish_function (0));
6142 pop_from_top_level ();
6145 /* Generate code to handle the destruction of DECL, an object with
6146 static storage duration. */
6149 register_dtor_fn (tree decl)
6158 type = TREE_TYPE (decl);
6159 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6160 return void_zero_node;
6162 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6163 a class object, we can just pass the destructor to
6164 "__cxa_atexit"; we don't have to build a temporary function to do
6166 use_dtor = (flag_use_cxa_atexit
6167 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6168 && CLASS_TYPE_P (type));
6173 /* Find the destructor. */
6174 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6175 gcc_assert (idx >= 0);
6176 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6177 /* Make sure it is accessible. */
6178 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6182 /* Call build_cleanup before we enter the anonymous function so
6183 that any access checks will be done relative to the current
6184 scope, rather than the scope of the anonymous function. */
6185 build_cleanup (decl);
6187 /* Now start the function. */
6188 cleanup = start_cleanup_fn ();
6190 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6191 to the original function, rather than the anonymous one. That
6192 will make the back end think that nested functions are in use,
6193 which causes confusion. */
6194 push_deferring_access_checks (dk_no_check);
6195 fcall = build_cleanup (decl);
6196 pop_deferring_access_checks ();
6198 /* Create the body of the anonymous function. */
6199 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6200 finish_expr_stmt (fcall);
6201 finish_compound_stmt (compound_stmt);
6205 /* Call atexit with the cleanup function. */
6206 mark_used (cleanup);
6207 cleanup = build_address (cleanup);
6208 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6214 /* We must convert CLEANUP to the type that "__cxa_atexit"
6216 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6217 /* "__cxa_atexit" will pass the address of DECL to the
6218 cleanup function. */
6220 addr = build_address (decl);
6221 /* The declared type of the parameter to "__cxa_atexit" is
6222 "void *". For plain "T*", we could just let the
6223 machinery in cp_build_function_call convert it -- but if the
6224 type is "cv-qualified T *", then we need to convert it
6225 before passing it in, to avoid spurious errors. */
6226 addr = build_nop (ptr_type_node, addr);
6229 /* Since the cleanup functions we build ignore the address
6230 they're given, there's no reason to pass the actual address
6231 in, and, in general, it's cheaper to pass NULL than any
6233 addr = null_pointer_node;
6234 args = tree_cons (NULL_TREE,
6235 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6236 tf_warning_or_error),
6238 if (targetm.cxx.use_aeabi_atexit ())
6240 args = tree_cons (NULL_TREE, cleanup, args);
6241 args = tree_cons (NULL_TREE, addr, args);
6245 args = tree_cons (NULL_TREE, addr, args);
6246 args = tree_cons (NULL_TREE, cleanup, args);
6250 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6251 return cp_build_function_call (get_atexit_node (), args,
6252 tf_warning_or_error);
6255 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6256 is its initializer. Generate code to handle the construction
6257 and destruction of DECL. */
6260 expand_static_init (tree decl, tree init)
6262 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6263 gcc_assert (TREE_STATIC (decl));
6265 /* Some variables require no initialization. */
6267 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6268 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6271 if (DECL_FUNCTION_SCOPE_P (decl))
6273 /* Emit code to perform this initialization but once. */
6274 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6275 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6276 tree guard, guard_addr;
6277 tree acquire_fn, release_fn, abort_fn;
6280 /* Emit code to perform this initialization but once. This code
6283 static <type> guard;
6284 if (!guard.first_byte) {
6285 if (__cxa_guard_acquire (&guard)) {
6288 // Do initialization.
6289 flag = true; __cxa_guard_release (&guard);
6290 // Register variable for destruction at end of program.
6292 if (!flag) __cxa_guard_abort (&guard);
6296 Note that the `flag' variable is only set to 1 *after* the
6297 initialization is complete. This ensures that an exception,
6298 thrown during the construction, will cause the variable to
6299 reinitialized when we pass through this code again, as per:
6303 If the initialization exits by throwing an exception, the
6304 initialization is not complete, so it will be tried again
6305 the next time control enters the declaration.
6307 This process should be thread-safe, too; multiple threads
6308 should not be able to initialize the variable more than
6311 /* Create the guard variable. */
6312 guard = get_guard (decl);
6314 /* This optimization isn't safe on targets with relaxed memory
6315 consistency. On such targets we force synchronization in
6316 __cxa_guard_acquire. */
6317 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6319 /* Begin the conditional initialization. */
6320 if_stmt = begin_if_stmt ();
6321 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6322 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6325 if (flag_threadsafe_statics)
6327 guard_addr = build_address (guard);
6329 acquire_fn = get_identifier ("__cxa_guard_acquire");
6330 release_fn = get_identifier ("__cxa_guard_release");
6331 abort_fn = get_identifier ("__cxa_guard_abort");
6332 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6334 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6336 tree vfntype = build_function_type (void_type_node, argtypes);
6337 acquire_fn = push_library_fn
6338 (acquire_fn, build_function_type (integer_type_node, argtypes),
6340 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6341 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6345 release_fn = identifier_global_value (release_fn);
6346 abort_fn = identifier_global_value (abort_fn);
6349 inner_if_stmt = begin_if_stmt ();
6350 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6353 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6354 begin = get_target_expr (boolean_false_node);
6355 flag = TARGET_EXPR_SLOT (begin);
6357 TARGET_EXPR_CLEANUP (begin)
6358 = build3 (COND_EXPR, void_type_node, flag,
6360 build_call_n (abort_fn, 1, guard_addr));
6361 CLEANUP_EH_ONLY (begin) = 1;
6363 /* Do the initialization itself. */
6364 init = add_stmt_to_compound (begin, init);
6365 init = add_stmt_to_compound
6366 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6367 init = add_stmt_to_compound
6368 (init, build_call_n (release_fn, 1, guard_addr));
6371 init = add_stmt_to_compound (init, set_guard (guard));
6373 /* Use atexit to register a function for destroying this static
6375 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6377 finish_expr_stmt (init);
6379 if (flag_threadsafe_statics)
6381 finish_compound_stmt (inner_then_clause);
6382 finish_then_clause (inner_if_stmt);
6383 finish_if_stmt (inner_if_stmt);
6386 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6388 finish_compound_stmt (then_clause);
6389 finish_then_clause (if_stmt);
6390 finish_if_stmt (if_stmt);
6394 static_aggregates = tree_cons (init, decl, static_aggregates);
6398 /* Make TYPE a complete type based on INITIAL_VALUE.
6399 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6400 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6401 3 if the initializer list is empty (in pedantic mode). */
6404 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6407 tree type, elt_type;
6411 unsigned HOST_WIDE_INT i;
6414 /* An array of character type can be initialized from a
6415 brace-enclosed string constant.
6417 FIXME: this code is duplicated from reshape_init. Probably
6418 we should just call reshape_init here? */
6419 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6420 && TREE_CODE (initial_value) == CONSTRUCTOR
6421 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6423 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6424 tree value = VEC_index (constructor_elt, v, 0)->value;
6426 if (TREE_CODE (value) == STRING_CST
6427 && VEC_length (constructor_elt, v) == 1)
6428 initial_value = value;
6431 /* If any of the elements are parameter packs, we can't actually
6432 complete this type now because the array size is dependent. */
6433 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6435 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6438 if (PACK_EXPANSION_P (value))
6444 failure = complete_array_type (ptype, initial_value, do_default);
6446 /* We can create the array before the element type is complete, which
6447 means that we didn't have these two bits set in the original type
6448 either. In completing the type, we are expected to propagate these
6449 bits. See also complete_type which does the same thing for arrays
6452 if (TYPE_DOMAIN (type))
6454 elt_type = TREE_TYPE (type);
6455 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6456 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6457 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6463 /* Return zero if something is declared to be a member of type
6464 CTYPE when in the context of CUR_TYPE. STRING is the error
6465 message to print in that case. Otherwise, quietly return 1. */
6468 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6470 if (ctype && ctype != cur_type)
6472 if (flags == DTOR_FLAG)
6473 error ("destructor for alien class %qT cannot be a member", ctype);
6475 error ("constructor for alien class %qT cannot be a member", ctype);
6481 /* Subroutine of `grokdeclarator'. */
6483 /* Generate errors possibly applicable for a given set of specifiers.
6484 This is for ARM $7.1.2. */
6487 bad_specifiers (tree object,
6496 error ("%qD declared as a %<virtual%> %s", object, type);
6498 error ("%qD declared as an %<inline%> %s", object, type);
6500 error ("%<const%> and %<volatile%> function specifiers on "
6501 "%qD invalid in %s declaration",
6504 error ("%q+D declared as a friend", object);
6506 && (TREE_CODE (object) == TYPE_DECL
6507 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6508 && !TYPE_REFFN_P (TREE_TYPE (object))
6509 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6510 error ("%q+D declared with an exception specification", object);
6513 /* DECL is a member function or static data member and is presently
6514 being defined. Check that the definition is taking place in a
6518 check_class_member_definition_namespace (tree decl)
6520 /* These checks only apply to member functions and static data
6522 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6523 || TREE_CODE (decl) == VAR_DECL);
6524 /* We check for problems with specializations in pt.c in
6525 check_specialization_namespace, where we can issue better
6527 if (processing_specialization)
6529 /* There are no restrictions on the placement of
6530 explicit instantiations. */
6531 if (processing_explicit_instantiation)
6535 A member function definition that appears outside of the
6536 class definition shall appear in a namespace scope enclosing
6537 the class definition.
6541 The definition for a static data member shall appear in a
6542 namespace scope enclosing the member's class definition. */
6543 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6544 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6545 decl, DECL_CONTEXT (decl));
6548 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6549 METHOD_TYPE for a non-static member function; QUALS are the
6550 cv-qualifiers that apply to the function. */
6553 build_this_parm (tree type, cp_cv_quals quals)
6558 cp_cv_quals this_quals;
6560 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6561 /* The `this' parameter is implicitly `const'; it cannot be
6563 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6564 qual_type = cp_build_qualified_type (this_type, this_quals);
6565 parm = build_artificial_parm (this_identifier, qual_type);
6566 cp_apply_type_quals_to_decl (this_quals, parm);
6570 /* CTYPE is class type, or null if non-class.
6571 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6573 DECLARATOR is the function's name.
6574 PARMS is a chain of PARM_DECLs for the function.
6575 VIRTUALP is truthvalue of whether the function is virtual or not.
6576 FLAGS are to be passed through to `grokclassfn'.
6577 QUALS are qualifiers indicating whether the function is `const'
6579 RAISES is a list of exceptions that this function can raise.
6580 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6581 not look, and -1 if we should not call `grokclassfn' at all.
6583 SFK is the kind of special function (if any) for the new function.
6585 Returns `NULL_TREE' if something goes wrong, after issuing
6586 applicable error messages. */
6589 grokfndecl (tree ctype,
6593 tree orig_declarator,
6595 enum overload_flags flags,
6602 special_function_kind sfk,
6607 location_t location)
6610 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6614 type = build_exception_variant (type, raises);
6616 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6618 /* If we have an explicit location, use it, otherwise use whatever
6619 build_lang_decl used (probably input_location). */
6620 if (location != UNKNOWN_LOCATION)
6621 DECL_SOURCE_LOCATION (decl) = location;
6623 if (TREE_CODE (type) == METHOD_TYPE)
6626 parm = build_this_parm (type, quals);
6627 TREE_CHAIN (parm) = parms;
6630 DECL_ARGUMENTS (decl) = parms;
6631 for (t = parms; t; t = TREE_CHAIN (t))
6632 DECL_CONTEXT (t) = decl;
6633 /* Propagate volatile out from type to decl. */
6634 if (TYPE_VOLATILE (type))
6635 TREE_THIS_VOLATILE (decl) = 1;
6637 /* Setup decl according to sfk. */
6640 case sfk_constructor:
6641 case sfk_copy_constructor:
6642 case sfk_move_constructor:
6643 DECL_CONSTRUCTOR_P (decl) = 1;
6645 case sfk_destructor:
6646 DECL_DESTRUCTOR_P (decl) = 1;
6652 /* If pointers to member functions use the least significant bit to
6653 indicate whether a function is virtual, ensure a pointer
6654 to this function will have that bit clear. */
6655 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6656 && TREE_CODE (type) == METHOD_TYPE
6657 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6658 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6661 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6665 ("defining explicit specialization %qD in friend declaration",
6669 tree fns = TREE_OPERAND (orig_declarator, 0);
6670 tree args = TREE_OPERAND (orig_declarator, 1);
6672 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6674 /* Something like `template <class T> friend void f<T>()'. */
6675 error ("invalid use of template-id %qD in declaration "
6676 "of primary template",
6682 /* A friend declaration of the form friend void f<>(). Record
6683 the information in the TEMPLATE_ID_EXPR. */
6684 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6686 if (TREE_CODE (fns) == COMPONENT_REF)
6688 /* Due to bison parser ickiness, we will have already looked
6689 up an operator_name or PFUNCNAME within the current class
6690 (see template_id in parse.y). If the current class contains
6691 such a name, we'll get a COMPONENT_REF here. Undo that. */
6693 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6694 == current_class_type);
6695 fns = TREE_OPERAND (fns, 1);
6697 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6698 || TREE_CODE (fns) == OVERLOAD);
6699 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6701 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6702 if (TREE_PURPOSE (t)
6703 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6705 error ("default arguments are not allowed in declaration "
6706 "of friend template specialization %qD",
6713 error ("%<inline%> is not allowed in declaration of friend "
6714 "template specialization %qD",
6721 /* If this decl has namespace scope, set that up. */
6723 set_decl_namespace (decl, in_namespace, friendp);
6725 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6727 /* `main' and builtins have implicit 'C' linkage. */
6728 if ((MAIN_NAME_P (declarator)
6729 || (IDENTIFIER_LENGTH (declarator) > 10
6730 && IDENTIFIER_POINTER (declarator)[0] == '_'
6731 && IDENTIFIER_POINTER (declarator)[1] == '_'
6732 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6733 && current_lang_name == lang_name_cplusplus
6734 && ctype == NULL_TREE
6735 /* NULL_TREE means global namespace. */
6736 && DECL_CONTEXT (decl) == NULL_TREE)
6737 SET_DECL_LANGUAGE (decl, lang_c);
6739 /* Should probably propagate const out from type to decl I bet (mrs). */
6742 DECL_STATIC_FUNCTION_P (decl) = 1;
6743 DECL_CONTEXT (decl) = ctype;
6748 DECL_CONTEXT (decl) = ctype;
6750 check_class_member_definition_namespace (decl);
6753 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6755 if (processing_template_decl)
6756 error ("cannot declare %<::main%> to be a template");
6758 error ("cannot declare %<::main%> to be inline");
6760 error ("cannot declare %<::main%> to be static");
6765 /* Members of anonymous types and local classes have no linkage; make
6766 them internal. If a typedef is made later, this will be changed. */
6767 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6768 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6771 if (publicp && cxx_dialect == cxx98)
6773 /* [basic.link]: A name with no linkage (notably, the name of a class
6774 or enumeration declared in a local scope) shall not be used to
6775 declare an entity with linkage.
6777 DR 757 relaxes this restriction for C++0x. */
6778 t = no_linkage_check (TREE_TYPE (decl),
6779 /*relaxed_p=*/false);
6782 if (TYPE_ANONYMOUS_P (t))
6784 if (DECL_EXTERN_C_P (decl))
6785 /* Allow this; it's pretty common in C. */;
6788 permerror (input_location, "non-local function %q#D uses anonymous type",
6790 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6791 permerror (input_location, "%q+#D does not refer to the unqualified "
6792 "type, so it is not used for linkage",
6797 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6801 TREE_PUBLIC (decl) = publicp;
6804 DECL_INTERFACE_KNOWN (decl) = 1;
6805 DECL_NOT_REALLY_EXTERN (decl) = 1;
6808 /* If the declaration was declared inline, mark it as such. */
6810 DECL_DECLARED_INLINE_P (decl) = 1;
6812 DECL_EXTERNAL (decl) = 1;
6813 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6816 ? G_("static member function %qD cannot have cv-qualifier")
6817 : G_("non-member function %qD cannot have cv-qualifier"),
6819 quals = TYPE_UNQUALIFIED;
6822 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6823 && !grok_op_properties (decl, /*complain=*/true))
6827 /* Make the init_value nonzero so pushdecl knows this is not
6828 tentative. error_mark_node is replaced later with the BLOCK. */
6829 DECL_INITIAL (decl) = error_mark_node;
6831 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6832 TREE_NOTHROW (decl) = 1;
6834 /* Caller will do the rest of this. */
6838 if (ctype != NULL_TREE)
6839 grokclassfn (ctype, decl, flags);
6841 decl = check_explicit_specialization (orig_declarator, decl,
6844 4 * (friendp != 0));
6845 if (decl == error_mark_node)
6850 cplus_decl_attributes (&decl, *attrlist, 0);
6851 *attrlist = NULL_TREE;
6854 /* Check main's type after attributes have been applied. */
6855 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6857 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6860 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6862 error ("%<::main%> must return %<int%>");
6863 newtype = build_function_type (integer_type_node, oldtypeargs);
6864 TREE_TYPE (decl) = newtype;
6867 check_main_parameter_types (decl);
6870 if (ctype != NULL_TREE
6871 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6874 tree old_decl = check_classfn (ctype, decl,
6875 (processing_template_decl
6876 > template_class_depth (ctype))
6877 ? current_template_parms
6880 if (old_decl == error_mark_node)
6888 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6889 /* Because grokfndecl is always supposed to return a
6890 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6891 here. We depend on our callers to figure out that its
6892 really a template that's being returned. */
6893 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6895 if (DECL_STATIC_FUNCTION_P (old_decl)
6896 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6897 /* Remove the `this' parm added by grokclassfn.
6898 XXX Isn't this done in start_function, too? */
6899 revert_static_member_fn (decl);
6900 if (DECL_ARTIFICIAL (old_decl))
6902 error ("definition of implicitly-declared %qD", old_decl);
6906 /* Since we've smashed OLD_DECL to its
6907 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6908 if (TREE_CODE (decl) == TEMPLATE_DECL)
6909 decl = DECL_TEMPLATE_RESULT (decl);
6911 /* Attempt to merge the declarations. This can fail, in
6912 the case of some invalid specialization declarations. */
6913 pushed_scope = push_scope (ctype);
6914 ok = duplicate_decls (decl, old_decl, friendp);
6916 pop_scope (pushed_scope);
6919 error ("no %q#D member function declared in class %qT",
6927 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6930 if (ctype == NULL_TREE || check)
6934 DECL_VIRTUAL_P (decl) = 1;
6939 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6940 the linkage that DECL will receive in the object file. */
6943 set_linkage_for_static_data_member (tree decl)
6945 /* A static data member always has static storage duration and
6946 external linkage. Note that static data members are forbidden in
6947 local classes -- the only situation in which a class has
6948 non-external linkage. */
6949 TREE_PUBLIC (decl) = 1;
6950 TREE_STATIC (decl) = 1;
6951 /* For non-template classes, static data members are always put
6952 out in exactly those files where they are defined, just as
6953 with ordinary namespace-scope variables. */
6954 if (!processing_template_decl)
6955 DECL_INTERFACE_KNOWN (decl) = 1;
6958 /* Create a VAR_DECL named NAME with the indicated TYPE.
6960 If SCOPE is non-NULL, it is the class type or namespace containing
6961 the variable. If SCOPE is NULL, the variable should is created in
6962 the innermost enclosings scope. */
6965 grokvardecl (tree type,
6967 const cp_decl_specifier_seq *declspecs,
6973 tree explicit_scope;
6975 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6977 /* Compute the scope in which to place the variable, but remember
6978 whether or not that scope was explicitly specified by the user. */
6979 explicit_scope = scope;
6982 /* An explicit "extern" specifier indicates a namespace-scope
6984 if (declspecs->storage_class == sc_extern)
6985 scope = current_namespace;
6986 else if (!at_function_scope_p ())
6987 scope = current_scope ();
6991 && (/* If the variable is a namespace-scope variable declared in a
6992 template, we need DECL_LANG_SPECIFIC. */
6993 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6994 /* Similarly for namespace-scope variables with language linkage
6996 || (TREE_CODE (scope) == NAMESPACE_DECL
6997 && current_lang_name != lang_name_cplusplus)
6998 /* Similarly for static data members. */
7000 decl = build_lang_decl (VAR_DECL, name, type);
7002 decl = build_decl (input_location, VAR_DECL, name, type);
7004 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7005 set_decl_namespace (decl, explicit_scope, 0);
7007 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7009 if (declspecs->storage_class == sc_extern)
7011 DECL_THIS_EXTERN (decl) = 1;
7012 DECL_EXTERNAL (decl) = !initialized;
7015 if (DECL_CLASS_SCOPE_P (decl))
7017 set_linkage_for_static_data_member (decl);
7018 /* This function is only called with out-of-class definitions. */
7019 DECL_EXTERNAL (decl) = 0;
7020 check_class_member_definition_namespace (decl);
7022 /* At top level, either `static' or no s.c. makes a definition
7023 (perhaps tentative), and absence of `static' makes it public. */
7024 else if (toplevel_bindings_p ())
7026 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7027 && (DECL_THIS_EXTERN (decl) || ! constp));
7028 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7030 /* Not at top level, only `static' makes a static definition. */
7033 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7034 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7037 if (declspecs->specs[(int)ds_thread])
7038 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7040 /* If the type of the decl has no linkage, make sure that we'll
7041 notice that in mark_used. */
7042 if (cxx_dialect > cxx98
7043 && decl_linkage (decl) != lk_none
7044 && DECL_LANG_SPECIFIC (decl) == NULL
7045 && !DECL_EXTERN_C_P (decl)
7046 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7047 retrofit_lang_decl (decl);
7049 if (TREE_PUBLIC (decl))
7051 /* [basic.link]: A name with no linkage (notably, the name of a class
7052 or enumeration declared in a local scope) shall not be used to
7053 declare an entity with linkage.
7055 DR 757 relaxes this restriction for C++0x. */
7056 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7057 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7060 if (TYPE_ANONYMOUS_P (t))
7062 if (DECL_EXTERN_C_P (decl))
7063 /* Allow this; it's pretty common in C. */
7067 /* DRs 132, 319 and 389 seem to indicate types with
7068 no linkage can only be used to declare extern "C"
7069 entities. Since it's not always an error in the
7070 ISO C++ 90 Standard, we only issue a warning. */
7071 warning (0, "non-local variable %q#D uses anonymous type",
7073 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7074 warning (0, "%q+#D does not refer to the unqualified "
7075 "type, so it is not used for linkage",
7080 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
7084 DECL_INTERFACE_KNOWN (decl) = 1;
7089 /* Create and return a canonical pointer to member function type, for
7090 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7093 build_ptrmemfunc_type (tree type)
7097 tree unqualified_variant = NULL_TREE;
7099 if (type == error_mark_node)
7102 /* If a canonical type already exists for this type, use it. We use
7103 this method instead of type_hash_canon, because it only does a
7104 simple equality check on the list of field members. */
7106 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7109 /* Make sure that we always have the unqualified pointer-to-member
7111 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7113 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7115 t = make_class_type (RECORD_TYPE);
7116 xref_basetypes (t, NULL_TREE);
7118 /* Let the front end know this is a pointer to member function... */
7119 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7120 /* ... and not really a class type. */
7121 SET_CLASS_TYPE_P (t, 0);
7123 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7126 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7128 TREE_CHAIN (field) = fields;
7131 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7133 /* Zap out the name so that the back end will give us the debugging
7134 information for this anonymous RECORD_TYPE. */
7135 TYPE_NAME (t) = NULL_TREE;
7137 /* If this is not the unqualified form of this pointer-to-member
7138 type, set the TYPE_MAIN_VARIANT for this type to be the
7139 unqualified type. Since they are actually RECORD_TYPEs that are
7140 not variants of each other, we must do this manually.
7141 As we just built a new type there is no need to do yet another copy. */
7142 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7144 int type_quals = cp_type_quals (type);
7145 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7146 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7147 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7148 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7149 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7150 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7151 TREE_TYPE (TYPE_BINFO (t)) = t;
7154 /* Cache this pointer-to-member type so that we can find it again
7156 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7158 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7159 SET_TYPE_STRUCTURAL_EQUALITY (t);
7160 else if (TYPE_CANONICAL (type) != type)
7161 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7166 /* Create and return a pointer to data member type. */
7169 build_ptrmem_type (tree class_type, tree member_type)
7171 if (TREE_CODE (member_type) == METHOD_TYPE)
7175 arg_types = TYPE_ARG_TYPES (member_type);
7176 class_type = (cp_build_qualified_type
7178 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7180 = build_method_type_directly (class_type,
7181 TREE_TYPE (member_type),
7182 TREE_CHAIN (arg_types));
7183 return build_ptrmemfunc_type (build_pointer_type (member_type));
7187 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7188 return build_offset_type (class_type, member_type);
7192 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7193 Check to see that the definition is valid. Issue appropriate error
7194 messages. Return 1 if the definition is particularly bad, or 0
7198 check_static_variable_definition (tree decl, tree type)
7200 /* Motion 10 at San Diego: If a static const integral data member is
7201 initialized with an integral constant expression, the initializer
7202 may appear either in the declaration (within the class), or in
7203 the definition, but not both. If it appears in the class, the
7204 member is a member constant. The file-scope definition is always
7206 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7208 error ("invalid in-class initialization of static data member "
7209 "of non-integral type %qT",
7211 /* If we just return the declaration, crashes will sometimes
7212 occur. We therefore return void_type_node, as if this were a
7213 friend declaration, to cause callers to completely ignore
7214 this declaration. */
7217 else if (!CP_TYPE_CONST_P (type))
7218 error ("ISO C++ forbids in-class initialization of non-const "
7219 "static member %qD",
7221 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7222 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7223 "%qD of non-integral type %qT", decl, type);
7228 /* Given the SIZE (i.e., number of elements) in an array, compute an
7229 appropriate index type for the array. If non-NULL, NAME is the
7230 name of the thing being declared. */
7233 compute_array_index_type (tree name, tree size)
7237 tree abi_1_itype = NULL_TREE;
7239 if (error_operand_p (size))
7240 return error_mark_node;
7242 type = TREE_TYPE (size);
7243 /* The array bound must be an integer type. */
7244 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7247 error ("size of array %qD has non-integral type %qT", name, type);
7249 error ("size of array has non-integral type %qT", type);
7250 size = integer_one_node;
7251 type = TREE_TYPE (size);
7254 /* We can only call value_dependent_expression_p on integral constant
7255 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7256 set if this isn't one. */
7257 if (processing_template_decl
7258 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7260 /* We cannot do any checking for a SIZE that isn't known to be
7261 constant. Just build the index type and mark that it requires
7262 structural equality checks. */
7263 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7264 size, integer_one_node));
7265 if (!TREE_SIDE_EFFECTS (size))
7267 TYPE_DEPENDENT_P (itype) = 1;
7268 TYPE_DEPENDENT_P_VALID (itype) = 1;
7270 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7274 if (!abi_version_at_least (2) && processing_template_decl)
7275 /* For abi-1, we handled all instances in templates the same way,
7276 even when they were non-dependent. This affects the manglings
7277 produced. So, we do the normal checking for non-dependent
7278 sizes, but at the end we'll return the same type that abi-1
7279 would have, but with TYPE_CANONICAL set to the "right"
7280 value that the current ABI would provide. */
7281 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7282 size, integer_one_node));
7284 /* The size might be the result of a cast. */
7285 STRIP_TYPE_NOPS (size);
7287 /* It might be a const variable or enumeration constant. */
7288 size = integral_constant_value (size);
7290 /* Normally, the array-bound will be a constant. */
7291 if (TREE_CODE (size) == INTEGER_CST)
7293 /* Check to see if the array bound overflowed. Make that an
7294 error, no matter how generous we're being. */
7295 constant_expression_error (size);
7297 /* An array must have a positive number of elements. */
7298 if (INT_CST_LT (size, integer_zero_node))
7301 error ("size of array %qD is negative", name);
7303 error ("size of array is negative");
7304 size = integer_one_node;
7306 /* As an extension we allow zero-sized arrays. We always allow
7307 them in system headers because glibc uses them. */
7308 else if (integer_zerop (size) && !in_system_header)
7311 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7313 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7316 else if (TREE_CONSTANT (size))
7318 /* `(int) &fn' is not a valid array bound. */
7320 error ("size of array %qD is not an integral constant-expression",
7323 error ("size of array is not an integral constant-expression");
7324 size = integer_one_node;
7326 else if (pedantic && warn_vla != 0)
7329 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7331 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7333 else if (warn_vla > 0)
7337 "variable length array %qD is used", name);
7340 "variable length array is used");
7343 if (processing_template_decl && !TREE_CONSTANT (size))
7344 /* A variable sized array. */
7345 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7348 HOST_WIDE_INT saved_processing_template_decl;
7350 /* Compute the index of the largest element in the array. It is
7351 one less than the number of elements in the array. We save
7352 and restore PROCESSING_TEMPLATE_DECL so that computations in
7353 cp_build_binary_op will be appropriately folded. */
7354 saved_processing_template_decl = processing_template_decl;
7355 processing_template_decl = 0;
7356 itype = cp_build_binary_op (input_location,
7358 cp_convert (ssizetype, size),
7359 cp_convert (ssizetype, integer_one_node),
7360 tf_warning_or_error);
7361 itype = fold (itype);
7362 processing_template_decl = saved_processing_template_decl;
7364 if (!TREE_CONSTANT (itype))
7365 /* A variable sized array. */
7366 itype = variable_size (itype);
7367 /* Make sure that there was no overflow when creating to a signed
7368 index type. (For example, on a 32-bit machine, an array with
7369 size 2^32 - 1 is too big.) */
7370 else if (TREE_CODE (itype) == INTEGER_CST
7371 && TREE_OVERFLOW (itype))
7373 error ("overflow in array dimension");
7374 TREE_OVERFLOW (itype) = 0;
7378 /* Create and return the appropriate index type. */
7381 tree t = build_index_type (itype);
7382 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7386 return build_index_type (itype);
7389 /* Returns the scope (if any) in which the entity declared by
7390 DECLARATOR will be located. If the entity was declared with an
7391 unqualified name, NULL_TREE is returned. */
7394 get_scope_of_declarator (const cp_declarator *declarator)
7396 while (declarator && declarator->kind != cdk_id)
7397 declarator = declarator->declarator;
7399 /* If the declarator-id is a SCOPE_REF, the scope in which the
7400 declaration occurs is the first operand. */
7402 && declarator->u.id.qualifying_scope)
7403 return declarator->u.id.qualifying_scope;
7405 /* Otherwise, the declarator is not a qualified name; the entity will
7406 be declared in the current scope. */
7410 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7411 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7415 create_array_type_for_decl (tree name, tree type, tree size)
7417 tree itype = NULL_TREE;
7418 const char* error_msg;
7420 /* If things have already gone awry, bail now. */
7421 if (type == error_mark_node || size == error_mark_node)
7422 return error_mark_node;
7424 /* Assume that everything will go OK. */
7427 /* There are some types which cannot be array elements. */
7428 switch (TREE_CODE (type))
7431 error_msg = "array of void";
7435 error_msg = "array of functions";
7438 case REFERENCE_TYPE:
7439 error_msg = "array of references";
7443 error_msg = "array of function members";
7450 /* If something went wrong, issue an error-message and return. */
7454 error ("declaration of %qD as %s", name, error_msg);
7456 error ("creating %s", error_msg);
7458 return error_mark_node;
7463 The constant expressions that specify the bounds of the arrays
7464 can be omitted only for the first member of the sequence. */
7465 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7468 error ("declaration of %qD as multidimensional array must "
7469 "have bounds for all dimensions except the first",
7472 error ("multidimensional array must have bounds for all "
7473 "dimensions except the first");
7475 return error_mark_node;
7478 /* Figure out the index type for the array. */
7480 itype = compute_array_index_type (name, size);
7483 T is called the array element type; this type shall not be [...] an
7484 abstract class type. */
7485 abstract_virtuals_error (name, type);
7487 return build_cplus_array_type (type, itype);
7490 /* Check that it's OK to declare a function with the indicated TYPE.
7491 SFK indicates the kind of special function (if any) that this
7492 function is. OPTYPE is the type given in a conversion operator
7493 declaration, or the class type for a constructor/destructor.
7494 Returns the actual return type of the function; that
7495 may be different than TYPE if an error occurs, or for certain
7496 special functions. */
7499 check_special_function_return_type (special_function_kind sfk,
7505 case sfk_constructor:
7507 error ("return type specification for constructor invalid");
7509 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7510 type = build_pointer_type (optype);
7512 type = void_type_node;
7515 case sfk_destructor:
7517 error ("return type specification for destructor invalid");
7518 /* We can't use the proper return type here because we run into
7519 problems with ambiguous bases and covariant returns.
7520 Java classes are left unchanged because (void *) isn't a valid
7521 Java type, and we don't want to change the Java ABI. */
7522 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7523 type = build_pointer_type (void_type_node);
7525 type = void_type_node;
7528 case sfk_conversion:
7530 error ("return type specified for %<operator %T%>", optype);
7541 /* A variable or data member (whose unqualified name is IDENTIFIER)
7542 has been declared with the indicated TYPE. If the TYPE is not
7543 acceptable, issue an error message and return a type to use for
7544 error-recovery purposes. */
7547 check_var_type (tree identifier, tree type)
7549 if (VOID_TYPE_P (type))
7552 error ("unnamed variable or field declared void");
7553 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7555 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7556 error ("variable or field %qE declared void", identifier);
7559 error ("variable or field declared void");
7560 type = error_mark_node;
7566 /* Given declspecs and a declarator (abstract or otherwise), determine
7567 the name and type of the object declared and construct a DECL node
7570 DECLSPECS points to the representation of declaration-specifier
7571 sequence that precedes declarator.
7573 DECL_CONTEXT says which syntactic context this declaration is in:
7574 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7575 FUNCDEF for a function definition. Like NORMAL but a few different
7576 error messages in each case. Return value may be zero meaning
7577 this definition is too screwy to try to parse.
7578 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7579 handle member functions (which have FIELD context).
7580 Return value may be zero meaning this definition is too screwy to
7582 PARM for a parameter declaration (either within a function prototype
7583 or before a function body). Make a PARM_DECL, or return void_type_node.
7584 CATCHPARM for a parameter declaration before a catch clause.
7585 TYPENAME if for a typename (in a cast or sizeof).
7586 Don't make a DECL node; just return the ..._TYPE node.
7587 FIELD for a struct or union field; make a FIELD_DECL.
7588 BITFIELD for a field with specified width.
7589 INITIALIZED is as for start_decl.
7591 ATTRLIST is a pointer to the list of attributes, which may be NULL
7592 if there are none; *ATTRLIST may be modified if attributes from inside
7593 the declarator should be applied to the declaration.
7595 When this function is called, scoping variables (such as
7596 CURRENT_CLASS_TYPE) should reflect the scope in which the
7597 declaration occurs, not the scope in which the new declaration will
7598 be placed. For example, on:
7602 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7605 Returns a DECL (if a declarator is present), a TYPE (if there is no
7606 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7610 grokdeclarator (const cp_declarator *declarator,
7611 const cp_decl_specifier_seq *declspecs,
7612 enum decl_context decl_context,
7616 tree type = NULL_TREE;
7618 int virtualp, explicitp, friendp, inlinep, staticp;
7619 int explicit_int = 0;
7620 int explicit_char = 0;
7621 int defaulted_int = 0;
7622 tree dependent_name = NULL_TREE;
7624 tree typedef_decl = NULL_TREE;
7625 const char *name = NULL;
7626 tree typedef_type = NULL_TREE;
7627 /* True if this declarator is a function definition. */
7628 bool funcdef_flag = false;
7629 cp_declarator_kind innermost_code = cdk_error;
7632 /* See the code below that used this. */
7633 tree decl_attr = NULL_TREE;
7636 /* Keep track of what sort of function is being processed
7637 so that we can warn about default return values, or explicit
7638 return values which do not match prescribed defaults. */
7639 special_function_kind sfk = sfk_none;
7641 tree dname = NULL_TREE;
7642 tree ctor_return_type = NULL_TREE;
7643 enum overload_flags flags = NO_SPECIAL;
7644 /* cv-qualifiers that apply to the declarator, for a declaration of
7645 a member function. */
7646 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7647 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7649 tree raises = NULL_TREE;
7650 int template_count = 0;
7651 tree returned_attrs = NULL_TREE;
7652 tree parms = NULL_TREE;
7653 const cp_declarator *id_declarator;
7654 /* The unqualified name of the declarator; either an
7655 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7656 tree unqualified_id;
7657 /* The class type, if any, in which this entity is located,
7658 or NULL_TREE if none. Note that this value may be different from
7659 the current class type; for example if an attempt is made to declare
7660 "A::f" inside "B", this value will be "A". */
7661 tree ctype = current_class_type;
7662 /* The NAMESPACE_DECL for the namespace in which this entity is
7663 located. If an unqualified name is used to declare the entity,
7664 this value will be NULL_TREE, even if the entity is located at
7666 tree in_namespace = NULL_TREE;
7667 cp_storage_class storage_class;
7668 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7669 bool type_was_error_mark_node = false;
7670 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7671 bool template_type_arg = false;
7672 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7675 signed_p = declspecs->specs[(int)ds_signed];
7676 unsigned_p = declspecs->specs[(int)ds_unsigned];
7677 short_p = declspecs->specs[(int)ds_short];
7678 long_p = declspecs->specs[(int)ds_long];
7679 longlong = declspecs->specs[(int)ds_long] >= 2;
7680 thread_p = declspecs->specs[(int)ds_thread];
7682 if (decl_context == FUNCDEF)
7683 funcdef_flag = true, decl_context = NORMAL;
7684 else if (decl_context == MEMFUNCDEF)
7685 funcdef_flag = true, decl_context = FIELD;
7686 else if (decl_context == BITFIELD)
7687 bitfield = 1, decl_context = FIELD;
7688 else if (decl_context == TEMPLATE_TYPE_ARG)
7689 template_type_arg = true, decl_context = TYPENAME;
7691 if (initialized > 1)
7692 funcdef_flag = true;
7694 /* Look inside a declarator for the name being declared
7695 and get it as a string, for an error message. */
7696 for (id_declarator = declarator;
7698 id_declarator = id_declarator->declarator)
7700 if (id_declarator->kind != cdk_id)
7701 innermost_code = id_declarator->kind;
7703 switch (id_declarator->kind)
7706 if (id_declarator->declarator
7707 && id_declarator->declarator->kind == cdk_id)
7709 sfk = id_declarator->declarator->u.id.sfk;
7710 if (sfk == sfk_destructor)
7717 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7718 tree decl = id_declarator->u.id.unqualified_name;
7721 if (qualifying_scope)
7723 if (at_function_scope_p ())
7727 A declarator-id shall not be qualified except
7730 None of the cases are permitted in block
7732 if (qualifying_scope == global_namespace)
7733 error ("invalid use of qualified-name %<::%D%>",
7735 else if (TYPE_P (qualifying_scope))
7736 error ("invalid use of qualified-name %<%T::%D%>",
7737 qualifying_scope, decl);
7739 error ("invalid use of qualified-name %<%D::%D%>",
7740 qualifying_scope, decl);
7741 return error_mark_node;
7743 else if (TYPE_P (qualifying_scope))
7745 ctype = qualifying_scope;
7746 if (innermost_code != cdk_function
7747 && current_class_type
7748 && !UNIQUELY_DERIVED_FROM_P (ctype,
7749 current_class_type))
7751 error ("type %qT is not derived from type %qT",
7752 ctype, current_class_type);
7753 return error_mark_node;
7756 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7757 in_namespace = qualifying_scope;
7759 switch (TREE_CODE (decl))
7765 if (innermost_code != cdk_function)
7767 error ("declaration of %qD as non-function", decl);
7768 return error_mark_node;
7770 else if (!qualifying_scope
7771 && !(current_class_type && at_class_scope_p ()))
7773 error ("declaration of %qD as non-member", decl);
7774 return error_mark_node;
7777 type = TREE_OPERAND (decl, 0);
7779 type = constructor_name (type);
7780 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7785 case TEMPLATE_ID_EXPR:
7787 tree fns = TREE_OPERAND (decl, 0);
7790 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7792 gcc_assert (is_overloaded_fn (dname));
7793 dname = DECL_NAME (get_first_fn (dname));
7798 case IDENTIFIER_NODE:
7799 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7802 if (C_IS_RESERVED_WORD (dname))
7804 error ("declarator-id missing; using reserved word %qD",
7806 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7808 else if (!IDENTIFIER_TYPENAME_P (dname))
7809 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7812 gcc_assert (flags == NO_SPECIAL);
7813 flags = TYPENAME_FLAG;
7814 ctor_return_type = TREE_TYPE (dname);
7815 sfk = sfk_conversion;
7816 if (is_typename_at_global_scope (dname))
7817 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7819 name = "<invalid operator>";
7836 return error_mark_node;
7841 if (id_declarator->kind == cdk_id)
7847 The declarator in a function-definition shall have the form
7848 D1 ( parameter-declaration-clause) ... */
7849 if (funcdef_flag && innermost_code != cdk_function)
7851 error ("function definition does not declare parameters");
7852 return error_mark_node;
7855 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7856 && innermost_code != cdk_function
7857 && ! (ctype && !declspecs->any_specifiers_p))
7859 error ("declaration of %qD as non-function", dname);
7860 return error_mark_node;
7863 /* Anything declared one level down from the top level
7864 must be one of the parameters of a function
7865 (because the body is at least two levels down). */
7867 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7868 by not allowing C++ class definitions to specify their parameters
7869 with xdecls (must be spec.d in the parmlist).
7871 Since we now wait to push a class scope until we are sure that
7872 we are in a legitimate method context, we must set oldcname
7873 explicitly (since current_class_name is not yet alive).
7875 We also want to avoid calling this a PARM if it is in a namespace. */
7877 if (decl_context == NORMAL && !toplevel_bindings_p ())
7879 struct cp_binding_level *b = current_binding_level;
7880 current_binding_level = b->level_chain;
7881 if (current_binding_level != 0 && toplevel_bindings_p ())
7882 decl_context = PARM;
7883 current_binding_level = b;
7887 name = decl_context == PARM ? "parameter" : "type name";
7889 /* If there were multiple types specified in the decl-specifier-seq,
7890 issue an error message. */
7891 if (declspecs->multiple_types_p)
7893 error ("two or more data types in declaration of %qs", name);
7894 return error_mark_node;
7897 if (declspecs->conflicting_specifiers_p)
7899 error ("conflicting specifiers in declaration of %qs", name);
7900 return error_mark_node;
7903 /* Extract the basic type from the decl-specifier-seq. */
7904 type = declspecs->type;
7905 if (type == error_mark_node)
7908 type_was_error_mark_node = true;
7910 /* If the entire declaration is itself tagged as deprecated then
7911 suppress reports of deprecated items. */
7912 if (type && TREE_DEPRECATED (type)
7913 && deprecated_state != DEPRECATED_SUPPRESS)
7914 warn_deprecated_use (type, NULL_TREE);
7915 if (type && TREE_CODE (type) == TYPE_DECL)
7917 typedef_decl = type;
7918 type = TREE_TYPE (typedef_decl);
7919 if (TREE_DEPRECATED (type)
7920 && DECL_ARTIFICIAL (typedef_decl)
7921 && deprecated_state != DEPRECATED_SUPPRESS)
7922 warn_deprecated_use (type, NULL_TREE);
7924 /* No type at all: default to `int', and set DEFAULTED_INT
7925 because it was not a user-defined typedef. */
7926 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7928 /* These imply 'int'. */
7929 type = integer_type_node;
7933 explicit_int = declspecs->explicit_int_p;
7934 explicit_char = declspecs->explicit_char_p;
7937 /* See the code below that used this. */
7939 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7941 typedef_type = type;
7944 if (sfk != sfk_conversion)
7945 ctor_return_type = ctype;
7947 if (sfk != sfk_none)
7948 type = check_special_function_return_type (sfk, type,
7950 else if (type == NULL_TREE)
7956 /* We handle `main' specially here, because 'main () { }' is so
7957 common. With no options, it is allowed. With -Wreturn-type,
7958 it is a warning. It is only an error with -pedantic-errors. */
7959 is_main = (funcdef_flag
7960 && dname && MAIN_NAME_P (dname)
7961 && ctype == NULL_TREE
7962 && in_namespace == NULL_TREE
7963 && current_namespace == global_namespace);
7965 if (type_was_error_mark_node)
7966 /* We've already issued an error, don't complain more. */;
7967 else if (in_system_header || flag_ms_extensions)
7968 /* Allow it, sigh. */;
7970 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7972 pedwarn (input_location, OPT_pedantic,
7973 "ISO C++ forbids declaration of %qs with no type", name);
7975 warning (OPT_Wreturn_type,
7976 "ISO C++ forbids declaration of %qs with no type", name);
7978 type = integer_type_node;
7983 /* Now process the modifiers that were specified
7984 and check for invalid combinations. */
7986 /* Long double is a special combination. */
7987 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7990 type = build_qualified_type (long_double_type_node,
7991 cp_type_quals (type));
7994 /* Check all other uses of type modifiers. */
7996 if (unsigned_p || signed_p || long_p || short_p)
8000 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8001 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8002 else if (signed_p && unsigned_p)
8003 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8004 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8005 error ("%<long long%> invalid for %qs", name);
8006 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8007 error ("%<long%> invalid for %qs", name);
8008 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8009 error ("%<short%> invalid for %qs", name);
8010 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8011 error ("%<long%> or %<short%> invalid for %qs", name);
8012 else if ((long_p || short_p) && explicit_char)
8013 error ("%<long%> or %<short%> specified with char for %qs", name);
8014 else if (long_p && short_p)
8015 error ("%<long%> and %<short%> specified together for %qs", name);
8016 else if (type == char16_type_node || type == char32_type_node)
8018 if (signed_p || unsigned_p)
8019 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8020 else if (short_p || long_p)
8021 error ("%<short%> or %<long%> invalid for %qs", name);
8026 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
8028 pedwarn (input_location, OPT_pedantic,
8029 "long, short, signed or unsigned used invalidly for %qs",
8031 if (flag_pedantic_errors)
8036 /* Discard the type modifiers if they are invalid. */
8047 /* Decide whether an integer type is signed or not.
8048 Optionally treat bitfields as signed by default. */
8052 It is implementation-defined whether a plain (neither
8053 explicitly signed or unsigned) char, short, int, or long
8054 bit-field is signed or unsigned.
8056 Naturally, we extend this to long long as well. Note that
8057 this does not include wchar_t. */
8058 || (bitfield && !flag_signed_bitfields
8060 /* A typedef for plain `int' without `signed' can be
8061 controlled just like plain `int', but a typedef for
8062 `signed int' cannot be so controlled. */
8064 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8065 && TREE_CODE (type) == INTEGER_TYPE
8066 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8069 type = long_long_unsigned_type_node;
8071 type = long_unsigned_type_node;
8073 type = short_unsigned_type_node;
8074 else if (type == char_type_node)
8075 type = unsigned_char_type_node;
8076 else if (typedef_decl)
8077 type = unsigned_type_for (type);
8079 type = unsigned_type_node;
8081 else if (signed_p && type == char_type_node)
8082 type = signed_char_type_node;
8084 type = long_long_integer_type_node;
8086 type = long_integer_type_node;
8088 type = short_integer_type_node;
8090 if (declspecs->specs[(int)ds_complex])
8092 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8093 error ("complex invalid for %qs", name);
8094 /* If we just have "complex", it is equivalent to
8095 "complex double", but if any modifiers at all are specified it is
8096 the complex form of TYPE. E.g, "complex short" is
8097 "complex short int". */
8099 else if (defaulted_int && ! longlong
8100 && ! (long_p || short_p || signed_p || unsigned_p))
8101 type = complex_double_type_node;
8102 else if (type == integer_type_node)
8103 type = complex_integer_type_node;
8104 else if (type == float_type_node)
8105 type = complex_float_type_node;
8106 else if (type == double_type_node)
8107 type = complex_double_type_node;
8108 else if (type == long_double_type_node)
8109 type = complex_long_double_type_node;
8111 type = build_complex_type (type);
8114 type_quals = TYPE_UNQUALIFIED;
8115 if (declspecs->specs[(int)ds_const])
8116 type_quals |= TYPE_QUAL_CONST;
8117 /* A `constexpr' specifier used in an object declaration declares
8118 the object as `const'. */
8121 if (innermost_code == cdk_function)
8123 else if (declspecs->specs[(int)ds_const] != 0)
8124 error ("both %<const%> and %<constexpr%> cannot be used here");
8126 type_quals |= TYPE_QUAL_CONST;
8128 if (declspecs->specs[(int)ds_volatile])
8129 type_quals |= TYPE_QUAL_VOLATILE;
8130 if (declspecs->specs[(int)ds_restrict])
8131 type_quals |= TYPE_QUAL_RESTRICT;
8132 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8133 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8136 if (TREE_CODE (type) == FUNCTION_TYPE
8137 && type_quals != TYPE_UNQUALIFIED)
8139 /* This was an error in C++98 (cv-qualifiers cannot be added to
8140 a function type), but DR 295 makes the code well-formed by
8141 dropping the extra qualifiers. */
8144 tree bad_type = build_qualified_type (type, type_quals);
8145 pedwarn (input_location, OPT_pedantic,
8146 "ignoring %qV qualifiers added to function type %qT",
8149 type_quals = TYPE_UNQUALIFIED;
8151 type_quals |= cp_type_quals (type);
8152 type = cp_build_qualified_type_real
8153 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8154 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8155 /* We might have ignored or rejected some of the qualifiers. */
8156 type_quals = cp_type_quals (type);
8159 inlinep = !! declspecs->specs[(int)ds_inline];
8160 virtualp = !! declspecs->specs[(int)ds_virtual];
8161 explicitp = !! declspecs->specs[(int)ds_explicit];
8163 storage_class = declspecs->storage_class;
8164 if (storage_class == sc_static)
8165 staticp = 1 + (decl_context == FIELD);
8167 if (virtualp && staticp == 2)
8169 error ("member %qD cannot be declared both virtual and static", dname);
8170 storage_class = sc_none;
8173 friendp = !! declspecs->specs[(int)ds_friend];
8175 if (dependent_name && !friendp)
8177 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8178 return error_mark_node;
8181 /* Issue errors about use of storage classes for parameters. */
8182 if (decl_context == PARM)
8184 if (declspecs->specs[(int)ds_typedef])
8186 error ("typedef declaration invalid in parameter declaration");
8187 return error_mark_node;
8189 else if (storage_class == sc_static
8190 || storage_class == sc_extern
8192 error ("storage class specifiers invalid in parameter declarations");
8194 if (type_uses_auto (type))
8196 error ("parameter declared %<auto%>");
8197 type = error_mark_node;
8200 /* Function parameters cannot be constexpr. If we saw one, moan
8201 and pretend it wasn't there. */
8204 error ("a parameter cannot be declared %<constexpr%>");
8209 /* Give error if `virtual' is used outside of class declaration. */
8211 && (current_class_name == NULL_TREE || decl_context != FIELD))
8213 error ("%<virtual%> outside class declaration");
8217 /* Static anonymous unions are dealt with here. */
8218 if (staticp && decl_context == TYPENAME
8220 && ANON_AGGR_TYPE_P (declspecs->type))
8221 decl_context = FIELD;
8223 /* Warn about storage classes that are invalid for certain
8224 kinds of declarations (parameters, typenames, etc.). */
8227 && storage_class != sc_extern
8228 && storage_class != sc_static)
8229 || declspecs->specs[(int)ds_typedef]))
8231 error ("multiple storage classes in declaration of %qs", name);
8234 if (decl_context != NORMAL
8235 && ((storage_class != sc_none
8236 && storage_class != sc_mutable)
8239 if ((decl_context == PARM || decl_context == CATCHPARM)
8240 && (storage_class == sc_register
8241 || storage_class == sc_auto))
8243 else if (declspecs->specs[(int)ds_typedef])
8245 else if (decl_context == FIELD
8246 /* C++ allows static class elements. */
8247 && storage_class == sc_static)
8248 /* C++ also allows inlines and signed and unsigned elements,
8249 but in those cases we don't come in here. */
8253 if (decl_context == FIELD)
8254 error ("storage class specified for %qs", name);
8257 if (decl_context == PARM || decl_context == CATCHPARM)
8258 error ("storage class specified for parameter %qs", name);
8260 error ("storage class specified for typename");
8262 if (storage_class == sc_register
8263 || storage_class == sc_auto
8264 || storage_class == sc_extern
8266 storage_class = sc_none;
8269 else if (storage_class == sc_extern && funcdef_flag
8270 && ! toplevel_bindings_p ())
8271 error ("nested function %qs declared %<extern%>", name);
8272 else if (toplevel_bindings_p ())
8274 if (storage_class == sc_auto)
8275 error ("top-level declaration of %qs specifies %<auto%>", name);
8278 && storage_class != sc_extern
8279 && storage_class != sc_static)
8281 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8286 if (storage_class && friendp)
8288 error ("storage class specifiers invalid in friend function declarations");
8289 storage_class = sc_none;
8294 unqualified_id = NULL_TREE;
8297 unqualified_id = id_declarator->u.id.unqualified_name;
8298 switch (TREE_CODE (unqualified_id))
8301 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8302 if (TYPE_P (unqualified_id))
8303 unqualified_id = constructor_name (unqualified_id);
8306 case IDENTIFIER_NODE:
8307 case TEMPLATE_ID_EXPR:
8315 /* Determine the type of the entity declared by recurring on the
8317 for (; declarator; declarator = declarator->declarator)
8319 const cp_declarator *inner_declarator;
8322 if (type == error_mark_node)
8323 return error_mark_node;
8325 attrs = declarator->attributes;
8331 if (declarator == NULL || declarator->kind == cdk_id)
8332 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8333 if (declarator->kind == cdk_function)
8334 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8335 if (declarator->kind == cdk_array)
8336 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8337 returned_attrs = decl_attributes (&type,
8338 chainon (returned_attrs, attrs),
8342 if (declarator->kind == cdk_id)
8345 inner_declarator = declarator->declarator;
8347 switch (declarator->kind)
8350 type = create_array_type_for_decl (dname, type,
8351 declarator->u.array.bounds);
8359 /* Declaring a function type.
8360 Make sure we have a valid type for the function to return. */
8362 if (type_quals != TYPE_UNQUALIFIED)
8364 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8365 warning (OPT_Wignored_qualifiers,
8366 "type qualifiers ignored on function return type");
8367 /* We now know that the TYPE_QUALS don't apply to the
8368 decl, but to its return type. */
8369 type_quals = TYPE_UNQUALIFIED;
8371 errmsg = targetm.invalid_return_type (type);
8375 type = integer_type_node;
8378 /* Error about some types functions can't return. */
8380 if (TREE_CODE (type) == FUNCTION_TYPE)
8382 error ("%qs declared as function returning a function", name);
8383 return error_mark_node;
8385 if (TREE_CODE (type) == ARRAY_TYPE)
8387 error ("%qs declared as function returning an array", name);
8388 return error_mark_node;
8391 /* Pick up type qualifiers which should be applied to `this'. */
8392 memfn_quals = declarator->u.function.qualifiers;
8394 /* Pick up the exception specifications. */
8395 raises = declarator->u.function.exception_specification;
8397 /* Say it's a definition only for the CALL_EXPR
8398 closest to the identifier. */
8399 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8401 /* Handle a late-specified return type. */
8404 if (type_uses_auto (type))
8406 if (!declarator->u.function.late_return_type)
8408 error ("%qs function uses %<auto%> type specifier without"
8409 " late return type", name);
8410 return error_mark_node;
8412 else if (!is_auto (type))
8414 error ("%qs function with late return type has"
8415 " %qT as its type rather than plain %<auto%>",
8417 return error_mark_node;
8420 else if (declarator->u.function.late_return_type)
8422 error ("%qs function with late return type not declared"
8423 " with %<auto%> type specifier", name);
8424 return error_mark_node;
8427 type = splice_late_return_type
8428 (type, declarator->u.function.late_return_type);
8429 if (type == error_mark_node)
8430 return error_mark_node;
8432 if (ctype == NULL_TREE
8433 && decl_context == FIELD
8435 && (friendp == 0 || dname == current_class_name))
8436 ctype = current_class_type;
8438 if (ctype && (sfk == sfk_constructor
8439 || sfk == sfk_destructor))
8441 /* We are within a class's scope. If our declarator name
8442 is the same as the class name, and we are defining
8443 a function, then it is a constructor/destructor, and
8444 therefore returns a void type. */
8446 /* ISO C++ 12.4/2. A destructor may not be declared
8447 const or volatile. A destructor may not be
8450 ISO C++ 12.1. A constructor may not be declared
8451 const or volatile. A constructor may not be
8452 virtual. A constructor may not be static. */
8454 error ((flags == DTOR_FLAG)
8455 ? "destructor cannot be static member function"
8456 : "constructor cannot be static member function");
8459 error ((flags == DTOR_FLAG)
8460 ? "destructors may not be cv-qualified"
8461 : "constructors may not be cv-qualified");
8462 memfn_quals = TYPE_UNQUALIFIED;
8465 if (decl_context == FIELD
8466 && !member_function_or_else (ctype,
8469 return error_mark_node;
8471 if (flags != DTOR_FLAG)
8473 /* It's a constructor. */
8478 permerror (input_location, "constructors cannot be declared virtual");
8481 if (decl_context == FIELD
8482 && sfk != sfk_constructor)
8483 return error_mark_node;
8485 if (decl_context == FIELD)
8491 error ("can't initialize friend function %qs", name);
8494 /* Cannot be both friend and virtual. */
8495 error ("virtual functions cannot be friends");
8498 if (decl_context == NORMAL)
8499 error ("friend declaration not in class definition");
8500 if (current_function_decl && funcdef_flag)
8501 error ("can't define friend function %qs in a local "
8505 else if (ctype && sfk == sfk_conversion)
8509 maybe_warn_cpp0x ("explicit conversion operators");
8514 /* It is not allowed to use `constexpr' in a function
8515 declaration that is not a definition.
8516 That is too strict, though. */
8517 if (constexpr_p && !funcdef_flag)
8519 error ("the %<constexpr%> specifier cannot be used in "
8520 "a function declaration that is not a definition");
8521 constexpr_p = false;
8524 /* A constexpr non-static member function is implicitly const. */
8525 if (constexpr_p && decl_context == FIELD && staticp == 0
8526 && sfk != sfk_constructor && sfk != sfk_destructor)
8527 memfn_quals |= TYPE_QUAL_CONST;
8529 arg_types = grokparms (declarator->u.function.parameters,
8532 if (inner_declarator
8533 && inner_declarator->kind == cdk_id
8534 && inner_declarator->u.id.sfk == sfk_destructor
8535 && arg_types != void_list_node)
8537 error ("destructors may not have parameters");
8538 arg_types = void_list_node;
8542 type = build_function_type (type, arg_types);
8549 /* Filter out pointers-to-references and references-to-references.
8550 We can get these if a TYPE_DECL is used. */
8552 if (TREE_CODE (type) == REFERENCE_TYPE)
8554 if (declarator->kind != cdk_reference)
8556 error ("cannot declare pointer to %q#T", type);
8557 type = TREE_TYPE (type);
8560 /* In C++0x, we allow reference to reference declarations
8561 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8562 and template type arguments [14.3.1/4 temp.arg.type]. The
8563 check for direct reference to reference declarations, which
8564 are still forbidden, occurs below. Reasoning behind the change
8565 can be found in DR106, DR540, and the rvalue reference
8567 else if (cxx_dialect == cxx98)
8569 error ("cannot declare reference to %q#T", type);
8570 type = TREE_TYPE (type);
8573 else if (VOID_TYPE_P (type))
8575 if (declarator->kind == cdk_reference)
8576 error ("cannot declare reference to %q#T", type);
8577 else if (declarator->kind == cdk_ptrmem)
8578 error ("cannot declare pointer to %q#T member", type);
8581 /* We now know that the TYPE_QUALS don't apply to the decl,
8582 but to the target of the pointer. */
8583 type_quals = TYPE_UNQUALIFIED;
8585 if (declarator->kind == cdk_ptrmem
8586 && (TREE_CODE (type) == FUNCTION_TYPE
8587 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8589 memfn_quals |= cp_type_quals (type);
8590 type = build_memfn_type (type,
8591 declarator->u.pointer.class_type,
8593 memfn_quals = TYPE_UNQUALIFIED;
8596 if (TREE_CODE (type) == FUNCTION_TYPE
8597 && cp_type_quals (type) != TYPE_UNQUALIFIED)
8598 error ("cannot declare %s to qualified function type %qT",
8599 declarator->kind == cdk_reference ? "reference" : "pointer",
8602 if (declarator->kind == cdk_reference)
8604 /* In C++0x, the type we are creating a reference to might be
8605 a typedef which is itself a reference type. In that case,
8606 we follow the reference collapsing rules in
8607 [7.1.3/8 dcl.typedef] to create the final reference type:
8609 "If a typedef TD names a type that is a reference to a type
8610 T, an attempt to create the type 'lvalue reference to cv TD'
8611 creates the type 'lvalue reference to T,' while an attempt
8612 to create the type "rvalue reference to cv TD' creates the
8615 if (!VOID_TYPE_P (type))
8616 type = cp_build_reference_type
8617 ((TREE_CODE (type) == REFERENCE_TYPE
8618 ? TREE_TYPE (type) : type),
8619 (declarator->u.reference.rvalue_ref
8620 && (TREE_CODE(type) != REFERENCE_TYPE
8621 || TYPE_REF_IS_RVALUE (type))));
8623 /* In C++0x, we need this check for direct reference to
8624 reference declarations, which are forbidden by
8625 [8.3.2/5 dcl.ref]. Reference to reference declarations
8626 are only allowed indirectly through typedefs and template
8627 type arguments. Example:
8629 void foo(int & &); // invalid ref-to-ref decl
8631 typedef int & int_ref;
8632 void foo(int_ref &); // valid ref-to-ref decl
8634 if (inner_declarator && inner_declarator->kind == cdk_reference)
8635 error ("cannot declare reference to %q#T, which is not "
8636 "a typedef or a template type argument", type);
8638 else if (TREE_CODE (type) == METHOD_TYPE)
8639 type = build_ptrmemfunc_type (build_pointer_type (type));
8640 else if (declarator->kind == cdk_ptrmem)
8642 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8644 if (declarator->u.pointer.class_type == error_mark_node)
8645 /* We will already have complained. */
8646 type = error_mark_node;
8648 type = build_ptrmem_type (declarator->u.pointer.class_type,
8652 type = build_pointer_type (type);
8654 /* Process a list of type modifier keywords (such as
8655 const or volatile) that were given inside the `*' or `&'. */
8657 if (declarator->u.pointer.qualifiers)
8660 = cp_build_qualified_type (type,
8661 declarator->u.pointer.qualifiers);
8662 type_quals = cp_type_quals (type);
8675 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8676 && TREE_CODE (type) != FUNCTION_TYPE
8677 && TREE_CODE (type) != METHOD_TYPE)
8679 error ("template-id %qD used as a declarator",
8681 unqualified_id = dname;
8684 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8685 qualified with a class-name, turn it into a METHOD_TYPE, unless
8686 we know that the function is static. We take advantage of this
8687 opportunity to do other processing that pertains to entities
8688 explicitly declared to be class members. Note that if DECLARATOR
8689 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8690 would not have exited the loop above. */
8692 && declarator->u.id.qualifying_scope
8693 && TYPE_P (declarator->u.id.qualifying_scope))
8697 ctype = declarator->u.id.qualifying_scope;
8698 ctype = TYPE_MAIN_VARIANT (ctype);
8700 while (t != NULL_TREE && CLASS_TYPE_P (t))
8702 /* You're supposed to have one `template <...>' for every
8703 template class, but you don't need one for a full
8704 specialization. For example:
8706 template <class T> struct S{};
8707 template <> struct S<int> { void f(); };
8708 void S<int>::f () {}
8710 is correct; there shouldn't be a `template <>' for the
8711 definition of `S<int>::f'. */
8712 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8713 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8714 /* T is an explicit (not partial) specialization. All
8715 containing classes must therefore also be explicitly
8718 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8719 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8720 template_count += 1;
8722 t = TYPE_MAIN_DECL (t);
8723 t = DECL_CONTEXT (t);
8726 if (ctype == current_class_type)
8730 permerror (input_location, "member functions are implicitly friends of their class");
8734 permerror (declarator->id_loc,
8735 "extra qualification %<%T::%> on member %qs",
8738 else if (/* If the qualifying type is already complete, then we
8739 can skip the following checks. */
8740 !COMPLETE_TYPE_P (ctype)
8741 && (/* If the function is being defined, then
8742 qualifying type must certainly be complete. */
8744 /* A friend declaration of "T::f" is OK, even if
8745 "T" is a template parameter. But, if this
8746 function is not a friend, the qualifying type
8748 || (!friendp && !CLASS_TYPE_P (ctype))
8749 /* For a declaration, the type need not be
8750 complete, if either it is dependent (since there
8751 is no meaningful definition of complete in that
8752 case) or the qualifying class is currently being
8754 || !(dependent_type_p (ctype)
8755 || currently_open_class (ctype)))
8756 /* Check that the qualifying type is complete. */
8757 && !complete_type_or_else (ctype, NULL_TREE))
8758 return error_mark_node;
8759 else if (TREE_CODE (type) == FUNCTION_TYPE)
8761 tree sname = declarator->u.id.unqualified_name;
8763 if (current_class_type
8764 && (!friendp || funcdef_flag))
8767 ? "cannot define member function %<%T::%s%> within %<%T%>"
8768 : "cannot declare member function %<%T::%s%> within %<%T%>",
8769 ctype, name, current_class_type);
8770 return error_mark_node;
8773 /* It is not permitted to define a member function outside ist
8774 membership class as `constexpr'. */
8776 error ("a constexpr function cannot be defined "
8777 "outside of its class.");
8779 if (TREE_CODE (sname) == IDENTIFIER_NODE
8780 && NEW_DELETE_OPNAME_P (sname))
8781 /* Overloaded operator new and operator delete
8782 are always static functions. */
8785 type = build_memfn_type (type, ctype, memfn_quals);
8787 else if (declspecs->specs[(int)ds_typedef]
8788 && current_class_type)
8790 error ("cannot declare member %<%T::%s%> within %qT",
8791 ctype, name, current_class_type);
8792 return error_mark_node;
8796 /* Now TYPE has the actual type. */
8801 *attrlist = chainon (returned_attrs, *attrlist);
8803 attrlist = &returned_attrs;
8806 /* Handle parameter packs. */
8807 if (parameter_pack_p)
8809 if (decl_context == PARM)
8810 /* Turn the type into a pack expansion.*/
8811 type = make_pack_expansion (type);
8813 error ("non-parameter %qs cannot be a parameter pack", name);
8816 /* Did array size calculations overflow? */
8818 if (TREE_CODE (type) == ARRAY_TYPE
8819 && COMPLETE_TYPE_P (type)
8820 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8821 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8823 error ("size of array %qs is too large", name);
8824 /* If we proceed with the array type as it is, we'll eventually
8825 crash in tree_low_cst(). */
8826 type = error_mark_node;
8829 if ((decl_context == FIELD || decl_context == PARM)
8830 && !processing_template_decl
8831 && variably_modified_type_p (type, NULL_TREE))
8833 if (decl_context == FIELD)
8834 error ("data member may not have variably modified type %qT", type);
8836 error ("parameter may not have variably modified type %qT", type);
8837 type = error_mark_node;
8840 if (explicitp == 1 || (explicitp && friendp))
8842 /* [dcl.fct.spec] The explicit specifier shall only be used in
8843 declarations of constructors within a class definition. */
8844 error ("only declarations of constructors can be %<explicit%>");
8848 if (storage_class == sc_mutable)
8850 if (decl_context != FIELD || friendp)
8852 error ("non-member %qs cannot be declared %<mutable%>", name);
8853 storage_class = sc_none;
8855 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8857 error ("non-object member %qs cannot be declared %<mutable%>", name);
8858 storage_class = sc_none;
8860 else if (TREE_CODE (type) == FUNCTION_TYPE
8861 || TREE_CODE (type) == METHOD_TYPE)
8863 error ("function %qs cannot be declared %<mutable%>", name);
8864 storage_class = sc_none;
8868 error ("static %qs cannot be declared %<mutable%>", name);
8869 storage_class = sc_none;
8871 else if (type_quals & TYPE_QUAL_CONST)
8873 error ("const %qs cannot be declared %<mutable%>", name);
8874 storage_class = sc_none;
8878 /* If this is declaring a typedef name, return a TYPE_DECL. */
8879 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8883 /* Note that the grammar rejects storage classes
8884 in typenames, fields or parameters. */
8885 if (current_lang_name == lang_name_java)
8886 TYPE_FOR_JAVA (type) = 1;
8888 /* This declaration:
8890 typedef void f(int) const;
8892 declares a function type which is not a member of any
8893 particular class, but which is cv-qualified; for
8894 example "f S::*" declares a pointer to a const-qualified
8895 member function of S. We record the cv-qualification in the
8897 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8899 type = cp_build_qualified_type (type, memfn_quals);
8901 /* We have now dealt with these qualifiers. */
8902 memfn_quals = TYPE_UNQUALIFIED;
8905 if (decl_context == FIELD)
8906 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8908 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
8909 if (id_declarator && declarator->u.id.qualifying_scope) {
8910 error_at (DECL_SOURCE_LOCATION (decl),
8911 "typedef name may not be a nested-name-specifier");
8912 TREE_TYPE (decl) = error_mark_node;
8915 if (decl_context != FIELD)
8917 if (!current_function_decl)
8918 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8919 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8920 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8921 (current_function_decl)))
8922 /* The TYPE_DECL is "abstract" because there will be
8923 clones of this constructor/destructor, and there will
8924 be copies of this TYPE_DECL generated in those
8926 DECL_ABSTRACT (decl) = 1;
8928 else if (constructor_name_p (unqualified_id, current_class_type))
8929 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8930 "as enclosing class",
8933 /* If the user declares "typedef struct {...} foo" then the
8934 struct will have an anonymous name. Fill that name in now.
8935 Nothing can refer to it, so nothing needs know about the name
8937 if (type != error_mark_node
8940 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8941 && TYPE_ANONYMOUS_P (type)
8942 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8946 /* Replace the anonymous name with the real name everywhere. */
8947 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8949 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
8951 debug_hooks->set_name (t, decl);
8952 TYPE_NAME (t) = decl;
8956 if (TYPE_LANG_SPECIFIC (type))
8957 TYPE_WAS_ANONYMOUS (type) = 1;
8959 /* If this is a typedef within a template class, the nested
8960 type is a (non-primary) template. The name for the
8961 template needs updating as well. */
8962 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8963 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8964 = TYPE_IDENTIFIER (type);
8966 /* Adjust linkage now that we aren't anonymous anymore. */
8967 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
8968 determine_visibility (TYPE_MAIN_DECL (type));
8970 /* FIXME remangle member functions; member functions of a
8971 type with external linkage have external linkage. */
8975 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8976 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8978 bad_specifiers (decl, "type", virtualp,
8979 memfn_quals != TYPE_UNQUALIFIED,
8980 inlinep, friendp, raises != NULL_TREE);
8985 /* Detect the case of an array type of unspecified size
8986 which came, as such, direct from a typedef name.
8987 We must copy the type, so that the array's domain can be
8988 individually set by the object's initializer. */
8990 if (type && typedef_type
8991 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8992 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8993 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8995 /* Detect where we're using a typedef of function type to declare a
8996 function. PARMS will not be set, so we must create it now. */
8998 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9000 tree decls = NULL_TREE;
9003 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
9005 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9007 TREE_CHAIN (decl) = decls;
9011 parms = nreverse (decls);
9013 if (decl_context != TYPENAME)
9015 /* A cv-qualifier-seq shall only be part of the function type
9016 for a non-static member function. [8.3.5/4 dcl.fct] */
9017 if (cp_type_quals (type) != TYPE_UNQUALIFIED
9018 && (current_class_type == NULL_TREE || staticp) )
9021 ? G_("qualified function types cannot be used to "
9022 "declare static member functions")
9023 : G_("qualified function types cannot be used to "
9024 "declare free functions"));
9025 type = TYPE_MAIN_VARIANT (type);
9028 /* The qualifiers on the function type become the qualifiers on
9029 the non-static member function. */
9030 memfn_quals |= cp_type_quals (type);
9034 /* If this is a type name (such as, in a cast or sizeof),
9035 compute the type and return it now. */
9037 if (decl_context == TYPENAME)
9039 /* Note that the grammar rejects storage classes
9040 in typenames, fields or parameters. */
9041 if (type_quals != TYPE_UNQUALIFIED)
9042 type_quals = TYPE_UNQUALIFIED;
9044 /* Special case: "friend class foo" looks like a TYPENAME context. */
9047 if (type_quals != TYPE_UNQUALIFIED)
9049 error ("type qualifiers specified for friend class declaration");
9050 type_quals = TYPE_UNQUALIFIED;
9054 error ("%<inline%> specified for friend class declaration");
9060 /* Don't allow friend declaration without a class-key. */
9061 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9062 permerror (input_location, "template parameters cannot be friends");
9063 else if (TREE_CODE (type) == TYPENAME_TYPE)
9064 permerror (input_location, "friend declaration requires class-key, "
9065 "i.e. %<friend class %T::%D%>",
9066 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9068 permerror (input_location, "friend declaration requires class-key, "
9069 "i.e. %<friend %#T%>",
9073 /* Only try to do this stuff if we didn't already give up. */
9074 if (type != integer_type_node)
9076 /* A friendly class? */
9077 if (current_class_type)
9078 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9081 error ("trying to make class %qT a friend of global scope",
9084 type = void_type_node;
9087 else if (memfn_quals)
9089 if (ctype == NULL_TREE
9090 && TREE_CODE (type) == METHOD_TYPE)
9091 ctype = TYPE_METHOD_BASETYPE (type);
9094 type = build_memfn_type (type, ctype, memfn_quals);
9095 /* Core issue #547: need to allow this in template type args. */
9096 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9097 type = cp_build_qualified_type (type, memfn_quals);
9099 error ("invalid qualifiers on non-member function type");
9104 else if (unqualified_id == NULL_TREE && decl_context != PARM
9105 && decl_context != CATCHPARM
9106 && TREE_CODE (type) != UNION_TYPE
9109 error ("abstract declarator %qT used as declaration", type);
9110 return error_mark_node;
9113 /* Only functions may be declared using an operator-function-id. */
9115 && IDENTIFIER_OPNAME_P (unqualified_id)
9116 && TREE_CODE (type) != FUNCTION_TYPE
9117 && TREE_CODE (type) != METHOD_TYPE)
9119 error ("declaration of %qD as non-function", unqualified_id);
9120 return error_mark_node;
9123 /* We don't check parameter types here because we can emit a better
9124 error message later. */
9125 if (decl_context != PARM)
9127 type = check_var_type (unqualified_id, type);
9128 if (type == error_mark_node)
9129 return error_mark_node;
9132 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9133 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9135 if (decl_context == PARM || decl_context == CATCHPARM)
9137 if (ctype || in_namespace)
9138 error ("cannot use %<::%> in parameter declaration");
9140 /* A parameter declared as an array of T is really a pointer to T.
9141 One declared as a function is really a pointer to a function.
9142 One declared as a member is really a pointer to member. */
9144 if (TREE_CODE (type) == ARRAY_TYPE)
9146 /* Transfer const-ness of array into that of type pointed to. */
9147 type = build_pointer_type (TREE_TYPE (type));
9148 type_quals = TYPE_UNQUALIFIED;
9150 else if (TREE_CODE (type) == FUNCTION_TYPE)
9151 type = build_pointer_type (type);
9157 if (decl_context == PARM)
9159 decl = cp_build_parm_decl (unqualified_id, type);
9161 bad_specifiers (decl, "parameter", virtualp,
9162 memfn_quals != TYPE_UNQUALIFIED,
9163 inlinep, friendp, raises != NULL_TREE);
9165 else if (decl_context == FIELD)
9167 /* The C99 flexible array extension. */
9168 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9169 && TYPE_DOMAIN (type) == NULL_TREE)
9171 tree itype = compute_array_index_type (dname, integer_zero_node);
9172 type = build_cplus_array_type (TREE_TYPE (type), itype);
9175 if (type == error_mark_node)
9177 /* Happens when declaring arrays of sizes which
9178 are error_mark_node, for example. */
9181 else if (in_namespace && !friendp)
9183 /* Something like struct S { int N::j; }; */
9184 error ("invalid use of %<::%>");
9185 return error_mark_node;
9187 else if (TREE_CODE (type) == FUNCTION_TYPE)
9190 tree function_context;
9194 if (ctype == NULL_TREE)
9195 ctype = current_class_type;
9197 if (ctype == NULL_TREE)
9199 error ("can't make %qD into a method -- not in a class",
9201 return error_mark_node;
9204 /* ``A union may [ ... ] not [ have ] virtual functions.''
9206 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9208 error ("function %qD declared virtual inside a union",
9210 return error_mark_node;
9213 if (NEW_DELETE_OPNAME_P (unqualified_id))
9217 error ("%qD cannot be declared virtual, since it "
9223 else if (staticp < 2)
9224 type = build_memfn_type (type, ctype, memfn_quals);
9227 /* Check that the name used for a destructor makes sense. */
9228 if (sfk == sfk_destructor)
9230 tree uqname = id_declarator->u.id.unqualified_name;
9234 gcc_assert (friendp);
9235 error ("expected qualified name in friend declaration "
9236 "for destructor %qD", uqname);
9237 return error_mark_node;
9240 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9242 error ("declaration of %qD as member of %qT",
9244 return error_mark_node;
9247 error ("a destructor cannot be %<constexpr%>");
9249 else if (sfk == sfk_constructor && friendp)
9251 error ("expected qualified name in friend declaration "
9252 "for constructor %qD",
9253 id_declarator->u.id.unqualified_name);
9254 return error_mark_node;
9257 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9258 function_context = (ctype != NULL_TREE) ?
9259 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9260 publicp = (! friendp || ! staticp)
9261 && function_context == NULL_TREE;
9262 decl = grokfndecl (ctype, type,
9263 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9264 ? unqualified_id : dname,
9267 virtualp, flags, memfn_quals, raises,
9268 friendp ? -1 : 0, friendp, publicp,
9269 inlinep || constexpr_p,
9271 funcdef_flag, template_count, in_namespace,
9272 attrlist, declarator->id_loc);
9273 if (decl == NULL_TREE)
9274 return error_mark_node;
9276 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9277 /* The decl and setting of decl_attr is also turned off. */
9278 decl = build_decl_attribute_variant (decl, decl_attr);
9281 /* [class.conv.ctor]
9283 A constructor declared without the function-specifier
9284 explicit that can be called with a single parameter
9285 specifies a conversion from the type of its first
9286 parameter to the type of its class. Such a constructor
9287 is called a converting constructor. */
9289 DECL_NONCONVERTING_P (decl) = 1;
9291 else if (TREE_CODE (type) == METHOD_TYPE)
9293 /* We only get here for friend declarations of
9294 members of other classes. */
9295 /* All method decls are public, so tell grokfndecl to set
9296 TREE_PUBLIC, also. */
9297 decl = grokfndecl (ctype, type,
9298 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9299 ? unqualified_id : dname,
9302 virtualp, flags, memfn_quals, raises,
9303 friendp ? -1 : 0, friendp, 1, 0, sfk,
9304 funcdef_flag, template_count, in_namespace,
9306 declarator->id_loc);
9307 if (decl == NULL_TREE)
9308 return error_mark_node;
9310 else if (!staticp && !dependent_type_p (type)
9311 && !COMPLETE_TYPE_P (complete_type (type))
9312 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9315 error ("field %qD has incomplete type", unqualified_id);
9317 error ("name %qT has incomplete type", type);
9319 /* If we're instantiating a template, tell them which
9320 instantiation made the field's type be incomplete. */
9321 if (current_class_type
9322 && TYPE_NAME (current_class_type)
9323 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9325 && declspecs->type == type)
9326 error (" in instantiation of template %qT",
9327 current_class_type);
9329 return error_mark_node;
9335 error ("%qE is neither function nor member function; "
9336 "cannot be declared friend", unqualified_id);
9344 /* Friends are treated specially. */
9345 if (ctype == current_class_type)
9346 ; /* We already issued a permerror. */
9347 else if (decl && DECL_NAME (decl))
9349 if (template_class_depth (current_class_type) == 0)
9351 decl = check_explicit_specialization
9352 (unqualified_id, decl, template_count,
9353 2 * funcdef_flag + 4);
9354 if (decl == error_mark_node)
9355 return error_mark_node;
9358 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9359 decl = do_friend (ctype, unqualified_id, decl,
9365 return error_mark_node;
9368 /* Structure field. It may not be a function, except for C++. */
9370 if (decl == NULL_TREE)
9376 /* An attempt is being made to initialize a non-static
9377 member. But, from [class.mem]:
9379 4 A member-declarator can contain a
9380 constant-initializer only if it declares a static
9381 member (_class.static_) of integral or enumeration
9382 type, see _class.static.data_.
9384 This used to be relatively common practice, but
9385 the rest of the compiler does not correctly
9386 handle the initialization unless the member is
9387 static so we make it static below. */
9388 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9390 permerror (input_location, "making %qD static", unqualified_id);
9394 if (uses_template_parms (type))
9395 /* We'll check at instantiation time. */
9397 else if (check_static_variable_definition (unqualified_id,
9399 /* If we just return the declaration, crashes
9400 will sometimes occur. We therefore return
9401 void_type_node, as if this was a friend
9402 declaration, to cause callers to completely
9403 ignore this declaration. */
9404 return error_mark_node;
9409 /* C++ allows static class members. All other work
9410 for this is done by grokfield. */
9411 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9412 set_linkage_for_static_data_member (decl);
9413 /* Even if there is an in-class initialization, DECL
9414 is considered undefined until an out-of-class
9415 definition is provided. */
9416 DECL_EXTERNAL (decl) = 1;
9419 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9424 error ("non-static data member %qE declared %<constexpr%>",
9426 decl = build_decl (input_location,
9427 FIELD_DECL, unqualified_id, type);
9428 DECL_NONADDRESSABLE_P (decl) = bitfield;
9429 if (bitfield && !unqualified_id)
9430 TREE_NO_WARNING (decl) = 1;
9432 if (storage_class == sc_mutable)
9434 DECL_MUTABLE_P (decl) = 1;
9435 storage_class = sc_none;
9439 bad_specifiers (decl, "field", virtualp,
9440 memfn_quals != TYPE_UNQUALIFIED,
9441 inlinep, friendp, raises != NULL_TREE);
9444 else if (TREE_CODE (type) == FUNCTION_TYPE
9445 || TREE_CODE (type) == METHOD_TYPE)
9450 if (!unqualified_id)
9451 return error_mark_node;
9453 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9454 original_name = dname;
9456 original_name = unqualified_id;
9458 if (storage_class == sc_auto)
9459 error ("storage class %<auto%> invalid for function %qs", name);
9460 else if (storage_class == sc_register)
9461 error ("storage class %<register%> invalid for function %qs", name);
9463 error ("storage class %<__thread%> invalid for function %qs", name);
9465 /* Function declaration not at top level.
9466 Storage classes other than `extern' are not allowed
9467 and `extern' makes no difference. */
9468 if (! toplevel_bindings_p ()
9469 && (storage_class == sc_static
9470 || declspecs->specs[(int)ds_inline])
9473 if (storage_class == sc_static)
9474 pedwarn (input_location, OPT_pedantic,
9475 "%<static%> specified invalid for function %qs "
9476 "declared out of global scope", name);
9478 pedwarn (input_location, OPT_pedantic,
9479 "%<inline%> specifier invalid for function %qs "
9480 "declared out of global scope", name);
9483 if (ctype != NULL_TREE
9484 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9486 error ("%q#T is not a class or a namespace", ctype);
9490 if (ctype == NULL_TREE)
9494 error ("virtual non-class function %qs", name);
9497 else if (sfk == sfk_constructor
9498 || sfk == sfk_destructor)
9501 ? "%qs defined in a non-class scope"
9502 : "%qs declared in a non-class scope", name);
9506 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9507 && !NEW_DELETE_OPNAME_P (original_name))
9508 type = build_method_type_directly (ctype,
9510 TYPE_ARG_TYPES (type));
9512 /* Record presence of `static'. */
9513 publicp = (ctype != NULL_TREE
9514 || storage_class == sc_extern
9515 || storage_class != sc_static);
9517 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9518 virtualp, flags, memfn_quals, raises,
9520 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9521 template_count, in_namespace, attrlist,
9522 declarator->id_loc);
9523 if (decl == NULL_TREE)
9524 return error_mark_node;
9528 int invalid_static = 0;
9530 /* Don't allow a static member function in a class, and forbid
9531 declaring main to be static. */
9532 if (TREE_CODE (type) == METHOD_TYPE)
9534 permerror (input_location, "cannot declare member function %qD to have "
9535 "static linkage", decl);
9538 else if (current_function_decl)
9540 /* FIXME need arm citation */
9541 error ("cannot declare static function inside another function");
9548 storage_class = sc_none;
9554 /* It's a variable. */
9556 /* An uninitialized decl with `extern' is a reference. */
9557 decl = grokvardecl (type, unqualified_id,
9560 (type_quals & TYPE_QUAL_CONST) != 0,
9561 ctype ? ctype : in_namespace);
9562 bad_specifiers (decl, "variable", virtualp,
9563 memfn_quals != TYPE_UNQUALIFIED,
9564 inlinep, friendp, raises != NULL_TREE);
9568 DECL_CONTEXT (decl) = ctype;
9571 permerror (input_location, "%<static%> may not be used when defining "
9572 "(as opposed to declaring) a static data member");
9574 storage_class = sc_none;
9576 if (storage_class == sc_register && TREE_STATIC (decl))
9578 error ("static member %qD declared %<register%>", decl);
9579 storage_class = sc_none;
9581 if (storage_class == sc_extern && pedantic)
9583 pedwarn (input_location, OPT_pedantic,
9584 "cannot explicitly declare member %q#D to have "
9585 "extern linkage", decl);
9586 storage_class = sc_none;
9591 if (storage_class == sc_extern && initialized && !funcdef_flag)
9593 if (toplevel_bindings_p ())
9595 /* It's common practice (and completely valid) to have a const
9596 be initialized and declared extern. */
9597 if (!(type_quals & TYPE_QUAL_CONST))
9598 warning (0, "%qs initialized and declared %<extern%>", name);
9602 error ("%qs has both %<extern%> and initializer", name);
9603 return error_mark_node;
9607 /* Record `register' declaration for warnings on &
9608 and in case doing stupid register allocation. */
9610 if (storage_class == sc_register)
9611 DECL_REGISTER (decl) = 1;
9612 else if (storage_class == sc_extern)
9613 DECL_THIS_EXTERN (decl) = 1;
9614 else if (storage_class == sc_static)
9615 DECL_THIS_STATIC (decl) = 1;
9617 /* Don't forget constexprness. */
9618 if (VAR_OR_FUNCTION_DECL_P (decl))
9619 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9621 /* Record constancy and volatility on the DECL itself . There's
9622 no need to do this when processing a template; we'll do this
9623 for the instantiated declaration based on the type of DECL. */
9624 if (!processing_template_decl)
9625 cp_apply_type_quals_to_decl (type_quals, decl);
9631 /* Subroutine of start_function. Ensure that each of the parameter
9632 types (as listed in PARMS) is complete, as is required for a
9633 function definition. */
9636 require_complete_types_for_parms (tree parms)
9638 for (; parms; parms = TREE_CHAIN (parms))
9640 if (dependent_type_p (TREE_TYPE (parms)))
9642 if (!VOID_TYPE_P (TREE_TYPE (parms))
9643 && complete_type_or_else (TREE_TYPE (parms), parms))
9645 relayout_decl (parms);
9646 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9649 /* grokparms or complete_type_or_else will have already issued
9651 TREE_TYPE (parms) = error_mark_node;
9655 /* Returns nonzero if T is a local variable. */
9658 local_variable_p (const_tree t)
9660 if ((TREE_CODE (t) == VAR_DECL
9661 /* A VAR_DECL with a context that is a _TYPE is a static data
9663 && !TYPE_P (CP_DECL_CONTEXT (t))
9664 /* Any other non-local variable must be at namespace scope. */
9665 && !DECL_NAMESPACE_SCOPE_P (t))
9666 || (TREE_CODE (t) == PARM_DECL))
9672 /* Like local_variable_p, but suitable for use as a tree-walking
9676 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9677 void *data ATTRIBUTE_UNUSED)
9679 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9681 else if (TYPE_P (*tp))
9688 /* Check that ARG, which is a default-argument expression for a
9689 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9690 something goes wrong. DECL may also be a _TYPE node, rather than a
9691 DECL, if there is no DECL available. */
9694 check_default_argument (tree decl, tree arg)
9699 if (TREE_CODE (arg) == DEFAULT_ARG)
9700 /* We get a DEFAULT_ARG when looking at an in-class declaration
9701 with a default argument. Ignore the argument for now; we'll
9702 deal with it after the class is complete. */
9711 decl_type = TREE_TYPE (decl);
9713 if (arg == error_mark_node
9714 || decl == error_mark_node
9715 || TREE_TYPE (arg) == error_mark_node
9716 || decl_type == error_mark_node)
9717 /* Something already went wrong. There's no need to check
9719 return error_mark_node;
9721 /* [dcl.fct.default]
9723 A default argument expression is implicitly converted to the
9725 if (!TREE_TYPE (arg)
9726 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9729 error ("default argument for %q#D has type %qT",
9730 decl, TREE_TYPE (arg));
9732 error ("default argument for parameter of type %qT has type %qT",
9733 decl_type, TREE_TYPE (arg));
9735 return error_mark_node;
9738 /* [dcl.fct.default]
9740 Local variables shall not be used in default argument
9743 The keyword `this' shall not be used in a default argument of a
9745 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9748 error ("default argument %qE uses local variable %qD", arg, var);
9749 return error_mark_node;
9756 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9759 type_is_deprecated (tree type)
9761 enum tree_code code;
9762 if (TREE_DEPRECATED (type))
9764 if (TYPE_NAME (type)
9765 && TREE_DEPRECATED (TYPE_NAME (type)))
9768 code = TREE_CODE (type);
9770 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9771 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9772 || code == METHOD_TYPE || code == ARRAY_TYPE)
9773 return type_is_deprecated (TREE_TYPE (type));
9775 if (TYPE_PTRMEMFUNC_P (type))
9776 return type_is_deprecated
9777 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9782 /* Decode the list of parameter types for a function type.
9783 Given the list of things declared inside the parens,
9784 return a list of types.
9786 If this parameter does not end with an ellipsis, we append
9789 *PARMS is set to the chain of PARM_DECLs created. */
9792 grokparms (tree parmlist, tree *parms)
9794 tree result = NULL_TREE;
9795 tree decls = NULL_TREE;
9799 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9801 tree type = NULL_TREE;
9802 tree init = TREE_PURPOSE (parm);
9803 tree decl = TREE_VALUE (parm);
9806 if (parm == void_list_node)
9809 if (! decl || TREE_TYPE (decl) == error_mark_node)
9812 type = TREE_TYPE (decl);
9813 if (VOID_TYPE_P (type))
9815 if (same_type_p (type, void_type_node)
9816 && DECL_SELF_REFERENCE_P (type)
9817 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9818 /* this is a parmlist of `(void)', which is ok. */
9820 cxx_incomplete_type_error (decl, type);
9821 /* It's not a good idea to actually create parameters of
9822 type `void'; other parts of the compiler assume that a
9823 void type terminates the parameter list. */
9824 type = error_mark_node;
9825 TREE_TYPE (decl) = error_mark_node;
9828 if (type != error_mark_node
9829 && TYPE_FOR_JAVA (type)
9830 && MAYBE_CLASS_TYPE_P (type))
9832 error ("parameter %qD has Java class type", decl);
9833 type = error_mark_node;
9834 TREE_TYPE (decl) = error_mark_node;
9838 if (type != error_mark_node
9839 && (errmsg = targetm.invalid_parameter_type (type)))
9842 type = error_mark_node;
9843 TREE_TYPE (decl) = error_mark_node;
9846 if (type != error_mark_node)
9848 if (deprecated_state != DEPRECATED_SUPPRESS)
9850 tree deptype = type_is_deprecated (type);
9852 warn_deprecated_use (deptype, NULL_TREE);
9855 /* Top-level qualifiers on the parameters are
9856 ignored for function types. */
9857 type = cp_build_qualified_type (type, 0);
9858 if (TREE_CODE (type) == METHOD_TYPE)
9860 error ("parameter %qD invalidly declared method type", decl);
9861 type = build_pointer_type (type);
9862 TREE_TYPE (decl) = type;
9864 else if (abstract_virtuals_error (decl, type))
9865 any_error = 1; /* Seems like a good idea. */
9866 else if (POINTER_TYPE_P (type))
9868 /* [dcl.fct]/6, parameter types cannot contain pointers
9869 (references) to arrays of unknown bound. */
9870 tree t = TREE_TYPE (type);
9871 int ptr = TYPE_PTR_P (type);
9877 else if (TREE_CODE (t) != ARRAY_TYPE)
9879 else if (!TYPE_DOMAIN (t))
9883 if (TREE_CODE (t) == ARRAY_TYPE)
9884 error ("parameter %qD includes %s to array of unknown "
9886 decl, ptr ? "pointer" : "reference", t);
9891 else if (init && !processing_template_decl)
9892 init = check_default_argument (decl, init);
9895 if (TREE_CODE (decl) == PARM_DECL
9896 && FUNCTION_PARAMETER_PACK_P (decl)
9897 && TREE_CHAIN (parm)
9898 && TREE_CHAIN (parm) != void_list_node)
9899 error ("parameter packs must be at the end of the parameter list");
9901 TREE_CHAIN (decl) = decls;
9903 result = tree_cons (init, type, result);
9905 decls = nreverse (decls);
9906 result = nreverse (result);
9908 result = chainon (result, void_list_node);
9915 /* D is a constructor or overloaded `operator='.
9917 Let T be the class in which D is declared. Then, this function
9920 -1 if D's is an ill-formed constructor or copy assignment operator
9921 whose first parameter is of type `T'.
9922 0 if D is not a copy constructor or copy assignment
9924 1 if D is a copy constructor or copy assignment operator whose
9925 first parameter is a reference to non-const qualified T.
9926 2 if D is a copy constructor or copy assignment operator whose
9927 first parameter is a reference to const qualified T.
9929 This function can be used as a predicate. Positive values indicate
9930 a copy constructor and nonzero values indicate a copy assignment
9934 copy_fn_p (const_tree d)
9940 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9942 if (TREE_CODE (d) == TEMPLATE_DECL
9943 || (DECL_TEMPLATE_INFO (d)
9944 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9945 /* Instantiations of template member functions are never copy
9946 functions. Note that member functions of templated classes are
9947 represented as template functions internally, and we must
9948 accept those as copy functions. */
9951 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9955 arg_type = TREE_VALUE (args);
9956 if (arg_type == error_mark_node)
9959 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9961 /* Pass by value copy assignment operator. */
9964 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9965 && !TYPE_REF_IS_RVALUE (arg_type)
9966 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9968 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9974 args = TREE_CHAIN (args);
9976 if (args && args != void_list_node && !TREE_PURPOSE (args))
9977 /* There are more non-optional args. */
9983 /* D is a constructor or overloaded `operator='.
9985 Let T be the class in which D is declared. Then, this function
9986 returns true when D is a move constructor or move assignment
9987 operator, false otherwise. */
9990 move_fn_p (const_tree d)
9994 bool result = false;
9996 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9998 if (cxx_dialect == cxx98)
9999 /* There are no move constructors if we are in C++98 mode. */
10002 if (TREE_CODE (d) == TEMPLATE_DECL
10003 || (DECL_TEMPLATE_INFO (d)
10004 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10005 /* Instantiations of template member functions are never copy
10006 functions. Note that member functions of templated classes are
10007 represented as template functions internally, and we must
10008 accept those as copy functions. */
10011 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10015 arg_type = TREE_VALUE (args);
10016 if (arg_type == error_mark_node)
10019 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10020 && TYPE_REF_IS_RVALUE (arg_type)
10021 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10025 args = TREE_CHAIN (args);
10027 if (args && args != void_list_node && !TREE_PURPOSE (args))
10028 /* There are more non-optional args. */
10034 /* Remember any special properties of member function DECL. */
10037 grok_special_member_properties (tree decl)
10041 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10044 class_type = DECL_CONTEXT (decl);
10045 if (DECL_CONSTRUCTOR_P (decl))
10047 int ctor = copy_fn_p (decl);
10049 if (!DECL_ARTIFICIAL (decl))
10050 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10056 A non-template constructor for class X is a copy
10057 constructor if its first parameter is of type X&, const
10058 X&, volatile X& or const volatile X&, and either there
10059 are no other parameters or else all other parameters have
10060 default arguments. */
10061 TYPE_HAS_INIT_REF (class_type) = 1;
10062 if (user_provided_p (decl))
10063 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
10065 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
10067 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10069 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10070 if (user_provided_p (decl))
10071 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10073 else if (is_list_ctor (decl))
10074 TYPE_HAS_LIST_CTOR (class_type) = 1;
10076 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10080 A non-template assignment operator for class X is a copy
10081 assignment operator if its parameter is of type X, X&, const
10082 X&, volatile X& or const volatile X&. */
10084 int assop = copy_fn_p (decl);
10088 TYPE_HAS_ASSIGN_REF (class_type) = 1;
10089 if (user_provided_p (decl))
10090 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
10092 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
10097 /* Check a constructor DECL has the correct form. Complains
10098 if the class has a constructor of the form X(X). */
10101 grok_ctor_properties (const_tree ctype, const_tree decl)
10103 int ctor_parm = copy_fn_p (decl);
10109 A declaration of a constructor for a class X is ill-formed if
10110 its first parameter is of type (optionally cv-qualified) X
10111 and either there are no other parameters or else all other
10112 parameters have default arguments.
10114 We *don't* complain about member template instantiations that
10115 have this form, though; they can occur as we try to decide
10116 what constructor to use during overload resolution. Since
10117 overload resolution will never prefer such a constructor to
10118 the non-template copy constructor (which is either explicitly
10119 or implicitly defined), there's no need to worry about their
10120 existence. Theoretically, they should never even be
10121 instantiated, but that's hard to forestall. */
10122 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10130 /* An operator with this code is unary, but can also be binary. */
10133 ambi_op_p (enum tree_code code)
10135 return (code == INDIRECT_REF
10136 || code == ADDR_EXPR
10137 || code == UNARY_PLUS_EXPR
10138 || code == NEGATE_EXPR
10139 || code == PREINCREMENT_EXPR
10140 || code == PREDECREMENT_EXPR);
10143 /* An operator with this name can only be unary. */
10146 unary_op_p (enum tree_code code)
10148 return (code == TRUTH_NOT_EXPR
10149 || code == BIT_NOT_EXPR
10150 || code == COMPONENT_REF
10151 || code == TYPE_EXPR);
10154 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10155 errors are issued for invalid declarations. */
10158 grok_op_properties (tree decl, bool complain)
10160 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10162 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10163 tree name = DECL_NAME (decl);
10164 enum tree_code operator_code;
10169 /* Count the number of arguments and check for ellipsis. */
10170 for (argtype = argtypes, arity = 0;
10171 argtype && argtype != void_list_node;
10172 argtype = TREE_CHAIN (argtype))
10174 ellipsis_p = !argtype;
10176 class_type = DECL_CONTEXT (decl);
10177 if (class_type && !CLASS_TYPE_P (class_type))
10178 class_type = NULL_TREE;
10180 if (DECL_CONV_FN_P (decl))
10181 operator_code = TYPE_EXPR;
10185 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10186 if (ansi_opname (CODE) == name) \
10188 operator_code = (CODE); \
10191 else if (ansi_assopname (CODE) == name) \
10193 operator_code = (CODE); \
10194 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10198 #include "operators.def"
10199 #undef DEF_OPERATOR
10201 gcc_unreachable ();
10204 gcc_assert (operator_code != MAX_TREE_CODES);
10205 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10208 switch (operator_code)
10211 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10215 TYPE_GETS_DELETE (class_type) |= 1;
10219 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10222 case VEC_DELETE_EXPR:
10223 TYPE_GETS_DELETE (class_type) |= 2;
10230 /* [basic.std.dynamic.allocation]/1:
10232 A program is ill-formed if an allocation function is declared
10233 in a namespace scope other than global scope or declared static
10236 The same also holds true for deallocation functions. */
10237 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10238 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10240 if (DECL_NAMESPACE_SCOPE_P (decl))
10242 if (CP_DECL_CONTEXT (decl) != global_namespace)
10244 error ("%qD may not be declared within a namespace", decl);
10247 else if (!TREE_PUBLIC (decl))
10249 error ("%qD may not be declared as static", decl);
10255 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10257 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10258 DECL_IS_OPERATOR_NEW (decl) = 1;
10260 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10261 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10264 /* An operator function must either be a non-static member function
10265 or have at least one parameter of a class, a reference to a class,
10266 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10267 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10269 if (operator_code == TYPE_EXPR
10270 || operator_code == CALL_EXPR
10271 || operator_code == COMPONENT_REF
10272 || operator_code == ARRAY_REF
10273 || operator_code == NOP_EXPR)
10275 if (class_type && LAMBDA_TYPE_P (class_type))
10276 /* Lambdas can have static op() and conv ops. */;
10279 error ("%qD must be a nonstatic member function", decl);
10287 if (DECL_STATIC_FUNCTION_P (decl))
10289 error ("%qD must be either a non-static member "
10290 "function or a non-member function", decl);
10294 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10296 tree arg = non_reference (TREE_VALUE (p));
10297 if (arg == error_mark_node)
10300 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10301 because these checks are performed even on
10302 template functions. */
10303 if (MAYBE_CLASS_TYPE_P (arg)
10304 || TREE_CODE (arg) == ENUMERAL_TYPE)
10308 if (!p || p == void_list_node)
10311 error ("%qD must have an argument of class or "
10312 "enumerated type", decl);
10318 /* There are no restrictions on the arguments to an overloaded
10320 if (operator_code == CALL_EXPR)
10323 /* Warn about conversion operators that will never be used. */
10324 if (IDENTIFIER_TYPENAME_P (name)
10325 && ! DECL_TEMPLATE_INFO (decl)
10327 /* Warn only declaring the function; there is no need to
10328 warn again about out-of-class definitions. */
10329 && class_type == current_class_type)
10331 tree t = TREE_TYPE (name);
10332 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10333 const char *what = 0;
10336 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10338 if (TREE_CODE (t) == VOID_TYPE)
10340 else if (class_type)
10342 if (t == class_type)
10343 what = "the same type";
10344 /* Don't force t to be complete here. */
10345 else if (MAYBE_CLASS_TYPE_P (t)
10346 && COMPLETE_TYPE_P (t)
10347 && DERIVED_FROM_P (t, class_type))
10348 what = "a base class";
10352 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10353 "conversion operator",
10354 ref ? "a reference to " : "", what);
10357 if (operator_code == COND_EXPR)
10360 error ("ISO C++ prohibits overloading operator ?:");
10363 else if (ellipsis_p)
10365 error ("%qD must not have variable number of arguments", decl);
10368 else if (ambi_op_p (operator_code))
10371 /* We pick the one-argument operator codes by default, so
10372 we don't have to change anything. */
10374 else if (arity == 2)
10376 /* If we thought this was a unary operator, we now know
10377 it to be a binary operator. */
10378 switch (operator_code)
10381 operator_code = MULT_EXPR;
10385 operator_code = BIT_AND_EXPR;
10388 case UNARY_PLUS_EXPR:
10389 operator_code = PLUS_EXPR;
10393 operator_code = MINUS_EXPR;
10396 case PREINCREMENT_EXPR:
10397 operator_code = POSTINCREMENT_EXPR;
10400 case PREDECREMENT_EXPR:
10401 operator_code = POSTDECREMENT_EXPR;
10405 gcc_unreachable ();
10408 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10410 if ((operator_code == POSTINCREMENT_EXPR
10411 || operator_code == POSTDECREMENT_EXPR)
10412 && ! processing_template_decl
10413 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10416 error ("postfix %qD must take %<int%> as its argument",
10419 error ("postfix %qD must take %<int%> as its second "
10427 error ("%qD must take either zero or one argument", decl);
10429 error ("%qD must take either one or two arguments", decl);
10433 /* More Effective C++ rule 6. */
10435 && (operator_code == POSTINCREMENT_EXPR
10436 || operator_code == POSTDECREMENT_EXPR
10437 || operator_code == PREINCREMENT_EXPR
10438 || operator_code == PREDECREMENT_EXPR))
10440 tree arg = TREE_VALUE (argtypes);
10441 tree ret = TREE_TYPE (TREE_TYPE (decl));
10442 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10443 arg = TREE_TYPE (arg);
10444 arg = TYPE_MAIN_VARIANT (arg);
10445 if (operator_code == PREINCREMENT_EXPR
10446 || operator_code == PREDECREMENT_EXPR)
10448 if (TREE_CODE (ret) != REFERENCE_TYPE
10449 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10451 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10452 build_reference_type (arg));
10456 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10457 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10461 else if (unary_op_p (operator_code))
10466 error ("%qD must take %<void%>", decl);
10468 error ("%qD must take exactly one argument", decl);
10472 else /* if (binary_op_p (operator_code)) */
10477 error ("%qD must take exactly one argument", decl);
10479 error ("%qD must take exactly two arguments", decl);
10483 /* More Effective C++ rule 7. */
10485 && (operator_code == TRUTH_ANDIF_EXPR
10486 || operator_code == TRUTH_ORIF_EXPR
10487 || operator_code == COMPOUND_EXPR))
10488 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10492 /* Effective C++ rule 23. */
10495 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10496 && (operator_code == PLUS_EXPR
10497 || operator_code == MINUS_EXPR
10498 || operator_code == TRUNC_DIV_EXPR
10499 || operator_code == MULT_EXPR
10500 || operator_code == TRUNC_MOD_EXPR)
10501 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10502 warning (OPT_Weffc__, "%qD should return by value", decl);
10504 /* [over.oper]/8 */
10505 for (; argtypes && argtypes != void_list_node;
10506 argtypes = TREE_CHAIN (argtypes))
10507 if (TREE_PURPOSE (argtypes))
10509 TREE_PURPOSE (argtypes) = NULL_TREE;
10510 if (operator_code == POSTINCREMENT_EXPR
10511 || operator_code == POSTDECREMENT_EXPR)
10513 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10518 error ("%qD cannot have default arguments", decl);
10526 /* Return a string giving the keyword associate with CODE. */
10528 static const char *
10529 tag_name (enum tag_types code)
10541 case typename_type:
10544 gcc_unreachable ();
10548 /* Name lookup in an elaborated-type-specifier (after the keyword
10549 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10550 elaborated-type-specifier is invalid, issue a diagnostic and return
10551 error_mark_node; otherwise, return the *_TYPE to which it referred.
10552 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10555 check_elaborated_type_specifier (enum tag_types tag_code,
10557 bool allow_template_p)
10563 struct S { struct S *p; };
10565 name lookup will find the TYPE_DECL for the implicit "S::S"
10566 typedef. Adjust for that here. */
10567 if (DECL_SELF_REFERENCE_P (decl))
10568 decl = TYPE_NAME (TREE_TYPE (decl));
10570 type = TREE_TYPE (decl);
10572 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10573 is false for this case as well. */
10574 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10576 error ("using template type parameter %qT after %qs",
10577 type, tag_name (tag_code));
10578 return error_mark_node;
10582 If the identifier resolves to a typedef-name or a template
10583 type-parameter, the elaborated-type-specifier is ill-formed.
10585 In other words, the only legitimate declaration to use in the
10586 elaborated type specifier is the implicit typedef created when
10587 the type is declared. */
10588 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10589 && tag_code != typename_type)
10591 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10592 error ("%q+D has a previous declaration here", decl);
10593 return error_mark_node;
10595 else if (TREE_CODE (type) != RECORD_TYPE
10596 && TREE_CODE (type) != UNION_TYPE
10597 && tag_code != enum_type
10598 && tag_code != typename_type)
10600 error ("%qT referred to as %qs", type, tag_name (tag_code));
10601 error ("%q+T has a previous declaration here", type);
10602 return error_mark_node;
10604 else if (TREE_CODE (type) != ENUMERAL_TYPE
10605 && tag_code == enum_type)
10607 error ("%qT referred to as enum", type);
10608 error ("%q+T has a previous declaration here", type);
10609 return error_mark_node;
10611 else if (!allow_template_p
10612 && TREE_CODE (type) == RECORD_TYPE
10613 && CLASSTYPE_IS_TEMPLATE (type))
10615 /* If a class template appears as elaborated type specifier
10616 without a template header such as:
10618 template <class T> class C {};
10619 void f(class C); // No template header here
10621 then the required template argument is missing. */
10622 error ("template argument required for %<%s %T%>",
10623 tag_name (tag_code),
10624 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10625 return error_mark_node;
10631 /* Lookup NAME in elaborate type specifier in scope according to
10632 SCOPE and issue diagnostics if necessary.
10633 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10634 found, and ERROR_MARK_NODE for type error. */
10637 lookup_and_check_tag (enum tag_types tag_code, tree name,
10638 tag_scope scope, bool template_header_p)
10642 if (scope == ts_global)
10644 /* First try ordinary name lookup, ignoring hidden class name
10645 injected via friend declaration. */
10646 decl = lookup_name_prefer_type (name, 2);
10647 /* If that fails, the name will be placed in the smallest
10648 non-class, non-function-prototype scope according to 3.3.1/5.
10649 We may already have a hidden name declared as friend in this
10650 scope. So lookup again but not ignoring hidden names.
10651 If we find one, that name will be made visible rather than
10652 creating a new tag. */
10654 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10657 decl = lookup_type_scope (name, scope);
10659 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10660 decl = DECL_TEMPLATE_RESULT (decl);
10662 if (decl && TREE_CODE (decl) == TYPE_DECL)
10664 /* Look for invalid nested type:
10668 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10670 error ("%qD has the same name as the class in which it is "
10673 return error_mark_node;
10676 /* Two cases we need to consider when deciding if a class
10677 template is allowed as an elaborated type specifier:
10678 1. It is a self reference to its own class.
10679 2. It comes with a template header.
10683 template <class T> class C {
10684 class C *c1; // DECL_SELF_REFERENCE_P is true
10687 template <class U> class C; // template_header_p is true
10688 template <class T> class C<T>::D {
10689 class C *c2; // DECL_SELF_REFERENCE_P is true
10692 t = check_elaborated_type_specifier (tag_code,
10695 | DECL_SELF_REFERENCE_P (decl));
10698 else if (decl && TREE_CODE (decl) == TREE_LIST)
10700 error ("reference to %qD is ambiguous", name);
10701 print_candidates (decl);
10702 return error_mark_node;
10708 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10709 Define the tag as a forward-reference if it is not defined.
10711 If a declaration is given, process it here, and report an error if
10712 multiple declarations are not identical.
10714 SCOPE is TS_CURRENT when this is also a definition. Only look in
10715 the current frame for the name (since C++ allows new names in any
10716 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10717 declaration. Only look beginning from the current scope outward up
10718 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10720 TEMPLATE_HEADER_P is true when this declaration is preceded by
10721 a set of template parameters. */
10724 xref_tag (enum tag_types tag_code, tree name,
10725 tag_scope scope, bool template_header_p)
10727 enum tree_code code;
10729 tree context = NULL_TREE;
10731 timevar_push (TV_NAME_LOOKUP);
10733 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10739 code = RECORD_TYPE;
10745 code = ENUMERAL_TYPE;
10748 gcc_unreachable ();
10751 /* In case of anonymous name, xref_tag is only called to
10752 make type node and push name. Name lookup is not required. */
10753 if (ANON_AGGRNAME_P (name))
10756 t = lookup_and_check_tag (tag_code, name,
10757 scope, template_header_p);
10759 if (t == error_mark_node)
10760 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10762 if (scope != ts_current && t && current_class_type
10763 && template_class_depth (current_class_type)
10764 && template_header_p)
10766 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10767 definition of this tag. Since, in addition, we are currently
10768 processing a (member) template declaration of a template
10769 class, we must be very careful; consider:
10776 { template <class V>
10777 friend struct S1; };
10779 Here, the S2::S1 declaration should not be confused with the
10780 outer declaration. In particular, the inner version should
10781 have a template parameter of level 2, not level 1. This
10782 would be particularly important if the member declaration
10785 template <class V = U> friend struct S1;
10787 say, when we should tsubst into `U' when instantiating
10788 S2. On the other hand, when presented with:
10798 we must find the inner binding eventually. We
10799 accomplish this by making sure that the new type we
10800 create to represent this declaration has the right
10802 context = TYPE_CONTEXT (t);
10808 /* If no such tag is yet defined, create a forward-reference node
10809 and record it as the "definition".
10810 When a real declaration of this type is found,
10811 the forward-reference will be altered into a real type. */
10812 if (code == ENUMERAL_TYPE)
10814 error ("use of enum %q#D without previous declaration", name);
10815 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10819 t = make_class_type (code);
10820 TYPE_CONTEXT (t) = context;
10821 t = pushtag (name, t, scope);
10826 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10828 if (!redeclare_class_template (t, current_template_parms))
10829 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10831 else if (!processing_template_decl
10832 && CLASS_TYPE_P (t)
10833 && CLASSTYPE_IS_TEMPLATE (t))
10835 error ("redeclaration of %qT as a non-template", t);
10836 error ("previous declaration %q+D", t);
10837 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10840 /* Make injected friend class visible. */
10841 if (scope != ts_within_enclosing_non_class
10842 && hidden_name_p (TYPE_NAME (t)))
10844 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10845 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10847 if (TYPE_TEMPLATE_INFO (t))
10849 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10850 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10855 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10859 xref_tag_from_type (tree old, tree id, tag_scope scope)
10861 enum tag_types tag_kind;
10863 if (TREE_CODE (old) == RECORD_TYPE)
10864 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10866 tag_kind = union_type;
10868 if (id == NULL_TREE)
10869 id = TYPE_IDENTIFIER (old);
10871 return xref_tag (tag_kind, id, scope, false);
10874 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10875 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10876 access_* node, and the TREE_VALUE is the type of the base-class.
10877 Non-NULL TREE_TYPE indicates virtual inheritance.
10879 Returns true if the binfo hierarchy was successfully created,
10880 false if an error was detected. */
10883 xref_basetypes (tree ref, tree base_list)
10886 tree binfo, base_binfo;
10887 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10888 unsigned max_bases = 0; /* Maximum direct bases. */
10890 tree default_access;
10891 tree igo_prev; /* Track Inheritance Graph Order. */
10893 if (ref == error_mark_node)
10896 /* The base of a derived class is private by default, all others are
10898 default_access = (TREE_CODE (ref) == RECORD_TYPE
10899 && CLASSTYPE_DECLARED_CLASS (ref)
10900 ? access_private_node : access_public_node);
10902 /* First, make sure that any templates in base-classes are
10903 instantiated. This ensures that if we call ourselves recursively
10904 we do not get confused about which classes are marked and which
10906 basep = &base_list;
10909 tree basetype = TREE_VALUE (*basep);
10911 if (!(processing_template_decl && uses_template_parms (basetype))
10912 && !complete_type_or_else (basetype, NULL))
10913 /* An incomplete type. Remove it from the list. */
10914 *basep = TREE_CHAIN (*basep);
10918 if (TREE_TYPE (*basep))
10920 if (CLASS_TYPE_P (basetype))
10921 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10922 basep = &TREE_CHAIN (*basep);
10926 TYPE_MARKED_P (ref) = 1;
10928 /* The binfo slot should be empty, unless this is an (ill-formed)
10930 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10931 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10933 binfo = make_tree_binfo (max_bases);
10935 TYPE_BINFO (ref) = binfo;
10936 BINFO_OFFSET (binfo) = size_zero_node;
10937 BINFO_TYPE (binfo) = ref;
10939 /* Apply base-class info set up to the variants of this type. */
10940 fixup_type_variants (ref);
10944 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10945 /* An aggregate cannot have baseclasses. */
10946 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10948 if (TREE_CODE (ref) == UNION_TYPE)
10950 error ("derived union %qT invalid", ref);
10957 if (TYPE_FOR_JAVA (ref))
10959 error ("Java class %qT cannot have multiple bases", ref);
10966 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10968 if (TYPE_FOR_JAVA (ref))
10970 error ("Java class %qT cannot have virtual bases", ref);
10975 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10977 tree access = TREE_PURPOSE (base_list);
10978 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10979 tree basetype = TREE_VALUE (base_list);
10981 if (access == access_default_node)
10982 access = default_access;
10984 if (PACK_EXPANSION_P (basetype))
10985 basetype = PACK_EXPANSION_PATTERN (basetype);
10986 if (TREE_CODE (basetype) == TYPE_DECL)
10987 basetype = TREE_TYPE (basetype);
10988 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10990 error ("base type %qT fails to be a struct or class type",
10995 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10996 TYPE_FOR_JAVA (ref) = 1;
10998 base_binfo = NULL_TREE;
10999 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11001 base_binfo = TYPE_BINFO (basetype);
11002 /* The original basetype could have been a typedef'd type. */
11003 basetype = BINFO_TYPE (base_binfo);
11005 /* Inherit flags from the base. */
11006 TYPE_HAS_NEW_OPERATOR (ref)
11007 |= TYPE_HAS_NEW_OPERATOR (basetype);
11008 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11009 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11010 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11011 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11012 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11013 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11014 CLASSTYPE_REPEATED_BASE_P (ref)
11015 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11018 /* We must do this test after we've seen through a typedef
11020 if (TYPE_MARKED_P (basetype))
11022 if (basetype == ref)
11023 error ("recursive type %qT undefined", basetype);
11025 error ("duplicate base type %qT invalid", basetype);
11029 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11030 /* Regenerate the pack expansion for the bases. */
11031 basetype = make_pack_expansion (basetype);
11033 TYPE_MARKED_P (basetype) = 1;
11035 base_binfo = copy_binfo (base_binfo, basetype, ref,
11036 &igo_prev, via_virtual);
11037 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11038 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11040 BINFO_BASE_APPEND (binfo, base_binfo);
11041 BINFO_BASE_ACCESS_APPEND (binfo, access);
11044 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11045 /* If we have space in the vbase vector, we must have shared at
11046 least one of them, and are therefore diamond shaped. */
11047 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11049 /* Unmark all the types. */
11050 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11051 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11052 TYPE_MARKED_P (ref) = 0;
11054 /* Now see if we have a repeated base type. */
11055 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11057 for (base_binfo = binfo; base_binfo;
11058 base_binfo = TREE_CHAIN (base_binfo))
11060 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11062 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11065 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11067 for (base_binfo = binfo; base_binfo;
11068 base_binfo = TREE_CHAIN (base_binfo))
11069 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11070 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11079 /* Begin compiling the definition of an enumeration type.
11082 UNDERLYING_TYPE is the type that will be used as the storage for
11083 the enumeration type. This should be NULL_TREE if no storage type
11086 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11088 Returns the type object, as yet incomplete.
11089 Also records info about it so that build_enumerator
11090 may be used to declare the individual values as they are read. */
11093 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
11097 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11099 /* If this is the real definition for a previous forward reference,
11100 fill in the contents in the same object that used to be the
11101 forward reference. */
11103 enumtype = lookup_and_check_tag (enum_type, name,
11104 /*tag_scope=*/ts_current,
11105 /*template_header_p=*/false);
11107 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11109 error_at (input_location, "multiple definition of %q#T", enumtype);
11110 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11111 "previous definition here");
11112 /* Clear out TYPE_VALUES, and start again. */
11113 TYPE_VALUES (enumtype) = NULL_TREE;
11117 /* In case of error, make a dummy enum to allow parsing to
11119 if (enumtype == error_mark_node)
11120 name = make_anon_name ();
11122 enumtype = cxx_make_type (ENUMERAL_TYPE);
11123 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11126 if (enumtype == error_mark_node)
11131 SET_SCOPED_ENUM_P (enumtype, 1);
11132 begin_scope (sk_scoped_enum, enumtype);
11134 /* [C++0x dcl.enum]p5:
11136 If not explicitly specified, the underlying type of a scoped
11137 enumeration type is int. */
11138 if (!underlying_type)
11139 underlying_type = integer_type_node;
11142 if (underlying_type)
11144 if (CP_INTEGRAL_TYPE_P (underlying_type))
11146 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11147 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11148 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11149 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11150 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11151 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11152 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11153 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11154 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11155 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11157 else if (!dependent_type_p (underlying_type))
11158 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11159 underlying_type, enumtype);
11165 /* After processing and defining all the values of an enumeration type,
11166 install their decls in the enumeration type and finish it off.
11167 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11170 finish_enum (tree enumtype)
11179 bool use_short_enum;
11184 tree underlying_type = NULL_TREE;
11185 bool fixed_underlying_type_p
11186 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11188 /* We built up the VALUES in reverse order. */
11189 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11191 /* For an enum defined in a template, just set the type of the values;
11192 all further processing is postponed until the template is
11193 instantiated. We need to set the type so that tsubst of a CONST_DECL
11195 if (processing_template_decl)
11197 for (values = TYPE_VALUES (enumtype);
11199 values = TREE_CHAIN (values))
11200 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11201 if (at_function_scope_p ())
11202 add_stmt (build_min (TAG_DEFN, enumtype));
11203 if (SCOPED_ENUM_P (enumtype))
11208 /* Determine the minimum and maximum values of the enumerators. */
11209 if (TYPE_VALUES (enumtype))
11211 minnode = maxnode = NULL_TREE;
11213 for (values = TYPE_VALUES (enumtype);
11215 values = TREE_CHAIN (values))
11217 decl = TREE_VALUE (values);
11219 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11220 each enumerator has the type of its enumeration. Prior to the
11221 closing brace, the type of each enumerator is the type of its
11222 initializing value. */
11223 TREE_TYPE (decl) = enumtype;
11225 /* Update the minimum and maximum values, if appropriate. */
11226 value = DECL_INITIAL (decl);
11227 if (value == error_mark_node)
11228 value = integer_zero_node;
11229 /* Figure out what the minimum and maximum values of the
11230 enumerators are. */
11232 minnode = maxnode = value;
11233 else if (tree_int_cst_lt (maxnode, value))
11235 else if (tree_int_cst_lt (value, minnode))
11242 If the enumerator-list is empty, the underlying type is as if
11243 the enumeration had a single enumerator with value 0. */
11244 minnode = maxnode = integer_zero_node;
11246 /* Compute the number of bits require to represent all values of the
11247 enumeration. We must do this before the type of MINNODE and
11248 MAXNODE are transformed, since tree_int_cst_min_precision relies
11249 on the TREE_TYPE of the value it is passed. */
11250 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11251 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11252 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11253 precision = MAX (lowprec, highprec);
11255 if (!fixed_underlying_type_p)
11257 /* Determine the underlying type of the enumeration.
11261 The underlying type of an enumeration is an integral type that
11262 can represent all the enumerator values defined in the
11263 enumeration. It is implementation-defined which integral type is
11264 used as the underlying type for an enumeration except that the
11265 underlying type shall not be larger than int unless the value of
11266 an enumerator cannot fit in an int or unsigned int.
11268 We use "int" or an "unsigned int" as the underlying type, even if
11269 a smaller integral type would work, unless the user has
11270 explicitly requested that we use the smallest possible type. The
11271 user can request that for all enumerations with a command line
11272 flag, or for just one enumeration with an attribute. */
11274 use_short_enum = flag_short_enums
11275 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11277 for (itk = (use_short_enum ? itk_char : itk_int);
11281 underlying_type = integer_types[itk];
11282 if (TYPE_PRECISION (underlying_type) >= precision
11283 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11286 if (itk == itk_none)
11290 IF no integral type can represent all the enumerator values, the
11291 enumeration is ill-formed. */
11292 error ("no integral type can represent all of the enumerator values "
11293 "for %qT", enumtype);
11294 precision = TYPE_PRECISION (long_long_integer_type_node);
11295 underlying_type = integer_types[itk_unsigned_long_long];
11300 The value of sizeof() applied to an enumeration type, an object
11301 of an enumeration type, or an enumerator, is the value of sizeof()
11302 applied to the underlying type. */
11303 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11304 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11305 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11306 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11307 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11308 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11310 /* Set the underlying type of the enumeration type to the
11311 computed enumeration type, restricted to the enumerator
11313 ENUM_UNDERLYING_TYPE (enumtype)
11314 = build_distinct_type_copy (underlying_type);
11315 set_min_and_max_values_for_integral_type
11316 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11319 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11321 /* Compute the minimum and maximum values for the type.
11325 For an enumeration where emin is the smallest enumerator and emax
11326 is the largest, the values of the enumeration are the values of the
11327 underlying type in the range bmin to bmax, where bmin and bmax are,
11328 respectively, the smallest and largest values of the smallest bit-
11329 field that can store emin and emax. */
11331 /* The middle-end currently assumes that types with TYPE_PRECISION
11332 narrower than their underlying type are suitably zero or sign
11333 extended to fill their mode. g++ doesn't make these guarantees.
11334 Until the middle-end can represent such paradoxical types, we
11335 set the TYPE_PRECISION to the width of the underlying type. */
11336 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11338 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11340 /* Convert each of the enumerators to the type of the underlying
11341 type of the enumeration. */
11342 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11344 location_t saved_location;
11346 decl = TREE_VALUE (values);
11347 saved_location = input_location;
11348 input_location = DECL_SOURCE_LOCATION (decl);
11349 if (fixed_underlying_type_p)
11350 /* If the enumeration type has a fixed underlying type, we
11351 already checked all of the enumerator values. */
11352 value = DECL_INITIAL (decl);
11354 value = perform_implicit_conversion (underlying_type,
11355 DECL_INITIAL (decl),
11356 tf_warning_or_error);
11357 input_location = saved_location;
11359 /* Do not clobber shared ints. */
11360 value = copy_node (value);
11362 TREE_TYPE (value) = enumtype;
11363 DECL_INITIAL (decl) = value;
11366 /* Fix up all variant types of this enum type. */
11367 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11369 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11370 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11371 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11372 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11373 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11374 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11375 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11376 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11377 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11378 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11379 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11382 /* Finish up the scope of a scoped enumeration. */
11383 if (SCOPED_ENUM_P (enumtype))
11386 /* Finish debugging output for this type. */
11387 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11390 /* Build and install a CONST_DECL for an enumeration constant of the
11391 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11392 Assignment of sequential values by default is handled here. */
11395 build_enumerator (tree name, tree value, tree enumtype)
11401 /* If the VALUE was erroneous, pretend it wasn't there; that will
11402 result in the enum being assigned the next value in sequence. */
11403 if (value == error_mark_node)
11406 /* Remove no-op casts from the value. */
11408 STRIP_TYPE_NOPS (value);
11410 if (! processing_template_decl)
11412 /* Validate and default VALUE. */
11413 if (value != NULL_TREE)
11415 value = integral_constant_value (value);
11417 if (TREE_CODE (value) == INTEGER_CST)
11419 value = perform_integral_promotions (value);
11420 constant_expression_warning (value);
11424 error ("enumerator value for %qD is not an integer constant", name);
11429 /* Default based on previous value. */
11430 if (value == NULL_TREE)
11432 if (TYPE_VALUES (enumtype))
11435 unsigned HOST_WIDE_INT lo;
11439 /* The next value is the previous value plus one.
11440 add_double doesn't know the type of the target expression,
11441 so we must check with int_fits_type_p as well. */
11442 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11443 if (error_operand_p (prev_value))
11444 value = error_mark_node;
11447 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11448 TREE_INT_CST_HIGH (prev_value),
11450 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11452 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11456 error ("overflow in enumeration values at %qD", name);
11457 value = error_mark_node;
11462 value = integer_zero_node;
11465 /* Remove no-op casts from the value. */
11466 STRIP_TYPE_NOPS (value);
11468 /* If the underlying type of the enum is fixed, check whether
11469 the enumerator values fits in the underlying type. If it
11470 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11471 if (ENUM_UNDERLYING_TYPE (enumtype)
11473 && TREE_CODE (value) == INTEGER_CST
11474 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11476 error ("enumerator value %E is too large for underlying type %<%T%>",
11477 value, ENUM_UNDERLYING_TYPE (enumtype));
11479 /* Silently convert the value so that we can continue. */
11480 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11485 /* C++ associates enums with global, function, or class declarations. */
11486 context = current_scope ();
11488 /* Build the actual enumeration constant. Note that the enumeration
11489 constants have the underlying type of the enum (if it is fixed)
11490 or the type of their initializer (if the underlying type of the
11491 enum is not fixed):
11495 If the underlying type is fixed, the type of each enumerator
11496 prior to the closing brace is the underlying type; if the
11497 initializing value of an enumerator cannot be represented by
11498 the underlying type, the program is ill-formed. If the
11499 underlying type is not fixed, the type of each enumerator is
11500 the type of its initializing value.
11502 If the underlying type is not fixed, it will be computed by
11503 finish_enum and we will reset the type of this enumerator. Of
11504 course, if we're processing a template, there may be no value. */
11505 type = value ? TREE_TYPE (value) : NULL_TREE;
11507 if (context && context == current_class_type)
11508 /* This enum declaration is local to the class. We need the full
11509 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11510 decl = build_lang_decl (CONST_DECL, name, type);
11512 /* It's a global enum, or it's local to a function. (Note local to
11513 a function could mean local to a class method. */
11514 decl = build_decl (input_location, CONST_DECL, name, type);
11516 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11517 TREE_CONSTANT (decl) = 1;
11518 TREE_READONLY (decl) = 1;
11519 DECL_INITIAL (decl) = value;
11521 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11522 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11523 on the TYPE_FIELDS list for `S'. (That's so that you can say
11524 things like `S::i' later.) */
11525 finish_member_declaration (decl);
11529 /* Add this enumeration constant to the list for this type. */
11530 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11533 /* Look for an enumerator with the given NAME within the enumeration
11534 type ENUMTYPE. This routine is used primarily for qualified name
11535 lookup into an enumerator in C++0x, e.g.,
11537 enum class Color { Red, Green, Blue };
11539 Color color = Color::Red;
11541 Returns the value corresponding to the enumerator, or
11542 NULL_TREE if no such enumerator was found. */
11544 lookup_enumerator (tree enumtype, tree name)
11547 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11549 e = purpose_member (name, TYPE_VALUES (enumtype));
11550 return e? TREE_VALUE (e) : NULL_TREE;
11554 /* We're defining DECL. Make sure that it's type is OK. */
11557 check_function_type (tree decl, tree current_function_parms)
11559 tree fntype = TREE_TYPE (decl);
11560 tree return_type = complete_type (TREE_TYPE (fntype));
11562 /* In a function definition, arg types must be complete. */
11563 require_complete_types_for_parms (current_function_parms);
11565 /* constexpr functions must have literal argument types and
11566 literal return type. */
11567 validate_constexpr_fundecl (decl);
11569 if (dependent_type_p (return_type))
11571 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11572 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11574 tree args = TYPE_ARG_TYPES (fntype);
11576 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11577 error ("return type %q#T is incomplete", return_type);
11579 error ("return type has Java class type %q#T", return_type);
11581 /* Make it return void instead. */
11582 if (TREE_CODE (fntype) == METHOD_TYPE)
11583 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11585 TREE_CHAIN (args));
11587 fntype = build_function_type (void_type_node, args);
11589 = build_exception_variant (fntype,
11590 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11593 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11596 /* Create the FUNCTION_DECL for a function definition.
11597 DECLSPECS and DECLARATOR are the parts of the declaration;
11598 they describe the function's name and the type it returns,
11599 but twisted together in a fashion that parallels the syntax of C.
11601 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11602 DECLARATOR is really the DECL for the function we are about to
11603 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11604 indicating that the function is an inline defined in-class.
11606 This function creates a binding context for the function body
11607 as well as setting up the FUNCTION_DECL in current_function_decl.
11609 For C++, we must first check whether that datum makes any sense.
11610 For example, "class A local_a(1,2);" means that variable local_a
11611 is an aggregate of type A, which should have a constructor
11612 applied to it with the argument list [1, 2].
11614 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11615 or may be a BLOCK if the function has been defined previously
11616 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11617 error_mark_node if the function has never been defined, or
11618 a BLOCK if the function has been defined somewhere. */
11621 start_preparsed_function (tree decl1, tree attrs, int flags)
11623 tree ctype = NULL_TREE;
11626 int doing_friend = 0;
11627 struct cp_binding_level *bl;
11628 tree current_function_parms;
11629 struct c_fileinfo *finfo
11630 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11631 bool honor_interface;
11633 /* Sanity check. */
11634 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11635 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11637 fntype = TREE_TYPE (decl1);
11638 if (TREE_CODE (fntype) == METHOD_TYPE)
11639 ctype = TYPE_METHOD_BASETYPE (fntype);
11641 /* ISO C++ 11.4/5. A friend function defined in a class is in
11642 the (lexical) scope of the class in which it is defined. */
11643 if (!ctype && DECL_FRIEND_P (decl1))
11645 ctype = DECL_FRIEND_CONTEXT (decl1);
11647 /* CTYPE could be null here if we're dealing with a template;
11648 for example, `inline friend float foo()' inside a template
11649 will have no CTYPE set. */
11650 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11656 if (DECL_DECLARED_INLINE_P (decl1)
11657 && lookup_attribute ("noinline", attrs))
11658 warning (0, "inline function %q+D given attribute noinline", decl1);
11660 /* Handle gnu_inline attribute. */
11661 if (GNU_INLINE_P (decl1))
11663 DECL_EXTERNAL (decl1) = 1;
11664 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11665 DECL_INTERFACE_KNOWN (decl1) = 1;
11666 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11669 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11670 /* This is a constructor, we must ensure that any default args
11671 introduced by this definition are propagated to the clones
11672 now. The clones are used directly in overload resolution. */
11673 adjust_clone_args (decl1);
11675 /* Sometimes we don't notice that a function is a static member, and
11676 build a METHOD_TYPE for it. Fix that up now. */
11677 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11678 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11680 revert_static_member_fn (decl1);
11684 /* Set up current_class_type, and enter the scope of the class, if
11687 push_nested_class (ctype);
11688 else if (DECL_STATIC_FUNCTION_P (decl1))
11689 push_nested_class (DECL_CONTEXT (decl1));
11691 /* Now that we have entered the scope of the class, we must restore
11692 the bindings for any template parameters surrounding DECL1, if it
11693 is an inline member template. (Order is important; consider the
11694 case where a template parameter has the same name as a field of
11695 the class.) It is not until after this point that
11696 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11697 if (flags & SF_INCLASS_INLINE)
11698 maybe_begin_member_template_processing (decl1);
11700 /* Effective C++ rule 15. */
11702 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11703 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11704 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11706 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11707 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11708 if (!DECL_INITIAL (decl1))
11709 DECL_INITIAL (decl1) = error_mark_node;
11711 /* This function exists in static storage.
11712 (This does not mean `static' in the C sense!) */
11713 TREE_STATIC (decl1) = 1;
11715 /* We must call push_template_decl after current_class_type is set
11716 up. (If we are processing inline definitions after exiting a
11717 class scope, current_class_type will be NULL_TREE until set above
11718 by push_nested_class.) */
11719 if (processing_template_decl)
11721 /* FIXME: Handle error_mark_node more gracefully. */
11722 tree newdecl1 = push_template_decl (decl1);
11723 if (newdecl1 != error_mark_node)
11727 /* We are now in the scope of the function being defined. */
11728 current_function_decl = decl1;
11730 /* Save the parm names or decls from this function's declarator
11731 where store_parm_decls will find them. */
11732 current_function_parms = DECL_ARGUMENTS (decl1);
11734 /* Make sure the parameter and return types are reasonable. When
11735 you declare a function, these types can be incomplete, but they
11736 must be complete when you define the function. */
11737 check_function_type (decl1, current_function_parms);
11739 /* Build the return declaration for the function. */
11740 restype = TREE_TYPE (fntype);
11741 if (DECL_RESULT (decl1) == NULL_TREE)
11745 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11746 DECL_ARTIFICIAL (resdecl) = 1;
11747 DECL_IGNORED_P (resdecl) = 1;
11748 DECL_RESULT (decl1) = resdecl;
11750 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11753 /* Let the user know we're compiling this function. */
11754 announce_function (decl1);
11756 /* Record the decl so that the function name is defined.
11757 If we already have a decl for this name, and it is a FUNCTION_DECL,
11758 use the old decl. */
11759 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11761 /* A specialization is not used to guide overload resolution. */
11762 if (!DECL_FUNCTION_MEMBER_P (decl1)
11763 && !(DECL_USE_TEMPLATE (decl1) &&
11764 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11766 tree olddecl = pushdecl (decl1);
11768 if (olddecl == error_mark_node)
11769 /* If something went wrong when registering the declaration,
11770 use DECL1; we have to have a FUNCTION_DECL to use when
11771 parsing the body of the function. */
11775 /* Otherwise, OLDDECL is either a previous declaration
11776 of the same function or DECL1 itself. */
11778 if (warn_missing_declarations
11779 && olddecl == decl1
11780 && !DECL_MAIN_P (decl1)
11781 && TREE_PUBLIC (decl1)
11782 && !DECL_DECLARED_INLINE_P (decl1))
11786 /* Check whether DECL1 is in an anonymous
11788 for (context = DECL_CONTEXT (decl1);
11790 context = DECL_CONTEXT (context))
11792 if (TREE_CODE (context) == NAMESPACE_DECL
11793 && DECL_NAME (context) == NULL_TREE)
11797 if (context == NULL)
11798 warning (OPT_Wmissing_declarations,
11799 "no previous declaration for %q+D", decl1);
11807 /* We need to set the DECL_CONTEXT. */
11808 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11809 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11811 fntype = TREE_TYPE (decl1);
11813 /* If #pragma weak applies, mark the decl appropriately now.
11814 The pragma only applies to global functions. Because
11815 determining whether or not the #pragma applies involves
11816 computing the mangled name for the declaration, we cannot
11817 apply the pragma until after we have merged this declaration
11818 with any previous declarations; if the original declaration
11819 has a linkage specification, that specification applies to
11820 the definition as well, and may affect the mangled name. */
11821 if (!DECL_CONTEXT (decl1))
11822 maybe_apply_pragma_weak (decl1);
11825 /* Reset this in case the call to pushdecl changed it. */
11826 current_function_decl = decl1;
11828 gcc_assert (DECL_INITIAL (decl1));
11830 /* This function may already have been parsed, in which case just
11831 return; our caller will skip over the body without parsing. */
11832 if (DECL_INITIAL (decl1) != error_mark_node)
11835 /* Initialize RTL machinery. We cannot do this until
11836 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11837 even when processing a template; this is how we get
11838 CFUN set up, and our per-function variables initialized.
11839 FIXME factor out the non-RTL stuff. */
11840 bl = current_binding_level;
11841 allocate_struct_function (decl1, processing_template_decl);
11843 /* Initialize the language data structures. Whenever we start
11844 a new function, we destroy temporaries in the usual way. */
11845 cfun->language = GGC_CNEW (struct language_function);
11846 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11847 current_binding_level = bl;
11849 /* Even though we're inside a function body, we still don't want to
11850 call expand_expr to calculate the size of a variable-sized array.
11851 We haven't necessarily assigned RTL to all variables yet, so it's
11852 not safe to try to expand expressions involving them. */
11853 cfun->dont_save_pending_sizes_p = 1;
11855 /* Start the statement-tree, start the tree now. */
11856 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11858 /* If we are (erroneously) defining a function that we have already
11859 defined before, wipe out what we knew before. */
11860 if (!DECL_PENDING_INLINE_P (decl1))
11861 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11863 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11865 /* We know that this was set up by `grokclassfn'. We do not
11866 wait until `store_parm_decls', since evil parse errors may
11867 never get us to that point. Here we keep the consistency
11868 between `current_class_type' and `current_class_ptr'. */
11869 tree t = DECL_ARGUMENTS (decl1);
11871 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11872 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11874 cp_function_chain->x_current_class_ref
11875 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11876 cp_function_chain->x_current_class_ptr = t;
11878 /* Constructors and destructors need to know whether they're "in
11879 charge" of initializing virtual base classes. */
11880 t = TREE_CHAIN (t);
11881 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11883 current_in_charge_parm = t;
11884 t = TREE_CHAIN (t);
11886 if (DECL_HAS_VTT_PARM_P (decl1))
11888 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11889 current_vtt_parm = t;
11893 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11894 /* Implicitly-defined methods (like the
11895 destructor for a class in which no destructor
11896 is explicitly declared) must not be defined
11897 until their definition is needed. So, we
11898 ignore interface specifications for
11899 compiler-generated functions. */
11900 && !DECL_ARTIFICIAL (decl1));
11902 if (DECL_INTERFACE_KNOWN (decl1))
11904 tree ctx = decl_function_context (decl1);
11906 if (DECL_NOT_REALLY_EXTERN (decl1))
11907 DECL_EXTERNAL (decl1) = 0;
11909 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11910 && TREE_PUBLIC (ctx))
11911 /* This is a function in a local class in an extern inline
11913 comdat_linkage (decl1);
11915 /* If this function belongs to an interface, it is public.
11916 If it belongs to someone else's interface, it is also external.
11917 This only affects inlines and template instantiations. */
11918 else if (!finfo->interface_unknown && honor_interface)
11920 if (DECL_DECLARED_INLINE_P (decl1)
11921 || DECL_TEMPLATE_INSTANTIATION (decl1)
11922 || processing_template_decl)
11924 DECL_EXTERNAL (decl1)
11925 = (finfo->interface_only
11926 || (DECL_DECLARED_INLINE_P (decl1)
11927 && ! flag_implement_inlines
11928 && !DECL_VINDEX (decl1)));
11930 /* For WIN32 we also want to put these in linkonce sections. */
11931 maybe_make_one_only (decl1);
11934 DECL_EXTERNAL (decl1) = 0;
11935 DECL_INTERFACE_KNOWN (decl1) = 1;
11936 /* If this function is in an interface implemented in this file,
11937 make sure that the back end knows to emit this function
11939 if (!DECL_EXTERNAL (decl1))
11940 mark_needed (decl1);
11942 else if (finfo->interface_unknown && finfo->interface_only
11943 && honor_interface)
11945 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11946 interface, we will have both finfo->interface_unknown and
11947 finfo->interface_only set. In that case, we don't want to
11948 use the normal heuristics because someone will supply a
11949 #pragma implementation elsewhere, and deducing it here would
11950 produce a conflict. */
11951 comdat_linkage (decl1);
11952 DECL_EXTERNAL (decl1) = 0;
11953 DECL_INTERFACE_KNOWN (decl1) = 1;
11954 DECL_DEFER_OUTPUT (decl1) = 1;
11958 /* This is a definition, not a reference.
11959 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11960 if (!GNU_INLINE_P (decl1))
11961 DECL_EXTERNAL (decl1) = 0;
11963 if ((DECL_DECLARED_INLINE_P (decl1)
11964 || DECL_TEMPLATE_INSTANTIATION (decl1))
11965 && ! DECL_INTERFACE_KNOWN (decl1)
11966 /* Don't try to defer nested functions for now. */
11967 && ! decl_function_context (decl1))
11968 DECL_DEFER_OUTPUT (decl1) = 1;
11970 DECL_INTERFACE_KNOWN (decl1) = 1;
11973 /* Determine the ELF visibility attribute for the function. We must not
11974 do this before calling "pushdecl", as we must allow "duplicate_decls"
11975 to merge any attributes appropriately. We also need to wait until
11977 if (!DECL_CLONED_FUNCTION_P (decl1))
11978 determine_visibility (decl1);
11980 begin_scope (sk_function_parms, decl1);
11984 if (DECL_DESTRUCTOR_P (decl1)
11985 || (DECL_CONSTRUCTOR_P (decl1)
11986 && targetm.cxx.cdtor_returns_this ()))
11988 cdtor_label = build_decl (input_location,
11989 LABEL_DECL, NULL_TREE, NULL_TREE);
11990 DECL_CONTEXT (cdtor_label) = current_function_decl;
11993 start_fname_decls ();
11995 store_parm_decls (current_function_parms);
11999 /* Like start_preparsed_function, except that instead of a
12000 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12002 Returns 1 on success. If the DECLARATOR is not suitable for a function
12003 (it defines a datum instead), we return 0, which tells
12004 yyparse to report a parse error. */
12007 start_function (cp_decl_specifier_seq *declspecs,
12008 const cp_declarator *declarator,
12013 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12014 if (decl1 == error_mark_node)
12016 /* If the declarator is not suitable for a function definition,
12017 cause a syntax error. */
12018 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12020 error ("invalid function declaration");
12024 if (DECL_MAIN_P (decl1))
12025 /* main must return int. grokfndecl should have corrected it
12026 (and issued a diagnostic) if the user got it wrong. */
12027 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12028 integer_type_node));
12030 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12035 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12039 use_eh_spec_block (tree fn)
12041 return (flag_exceptions && flag_enforce_eh_specs
12042 && !processing_template_decl
12043 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
12044 /* We insert the EH_SPEC_BLOCK only in the original
12045 function; then, it is copied automatically to the
12047 && !DECL_CLONED_FUNCTION_P (fn)
12048 /* Implicitly-generated constructors and destructors have
12049 exception specifications. However, those specifications
12050 are the union of the possible exceptions specified by the
12051 constructors/destructors for bases and members, so no
12052 unallowed exception will ever reach this function. By
12053 not creating the EH_SPEC_BLOCK we save a little memory,
12054 and we avoid spurious warnings about unreachable
12056 && !DECL_ARTIFICIAL (fn));
12059 /* Store the parameter declarations into the current function declaration.
12060 This is called after parsing the parameter declarations, before
12061 digesting the body of the function.
12063 Also install to binding contour return value identifier, if any. */
12066 store_parm_decls (tree current_function_parms)
12068 tree fndecl = current_function_decl;
12071 /* This is a chain of any other decls that came in among the parm
12072 declarations. If a parm is declared with enum {foo, bar} x;
12073 then CONST_DECLs for foo and bar are put here. */
12074 tree nonparms = NULL_TREE;
12076 if (current_function_parms)
12078 /* This case is when the function was defined with an ANSI prototype.
12079 The parms already have decls, so we need not do anything here
12080 except record them as in effect
12081 and complain if any redundant old-style parm decls were written. */
12083 tree specparms = current_function_parms;
12086 /* Must clear this because it might contain TYPE_DECLs declared
12088 current_binding_level->names = NULL;
12090 /* If we're doing semantic analysis, then we'll call pushdecl
12091 for each of these. We must do them in reverse order so that
12092 they end in the correct forward order. */
12093 specparms = nreverse (specparms);
12095 for (parm = specparms; parm; parm = next)
12097 next = TREE_CHAIN (parm);
12098 if (TREE_CODE (parm) == PARM_DECL)
12100 if (DECL_NAME (parm) == NULL_TREE
12101 || TREE_CODE (parm) != VOID_TYPE)
12104 error ("parameter %qD declared void", parm);
12108 /* If we find an enum constant or a type tag,
12109 put it aside for the moment. */
12110 TREE_CHAIN (parm) = NULL_TREE;
12111 nonparms = chainon (nonparms, parm);
12115 /* Get the decls in their original chain order and record in the
12116 function. This is all and only the PARM_DECLs that were
12117 pushed into scope by the loop above. */
12118 DECL_ARGUMENTS (fndecl) = getdecls ();
12121 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12123 /* Now store the final chain of decls for the arguments
12124 as the decl-chain of the current lexical scope.
12125 Put the enumerators in as well, at the front so that
12126 DECL_ARGUMENTS is not modified. */
12127 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12129 if (use_eh_spec_block (current_function_decl))
12130 current_eh_spec_block = begin_eh_spec_block ();
12134 /* We have finished doing semantic analysis on DECL, but have not yet
12135 generated RTL for its body. Save away our current state, so that
12136 when we want to generate RTL later we know what to do. */
12139 save_function_data (tree decl)
12141 struct language_function *f;
12143 /* Save the language-specific per-function data so that we can
12144 get it back when we really expand this function. */
12145 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12148 f = GGC_NEW (struct language_function);
12149 memcpy (f, cp_function_chain, sizeof (struct language_function));
12150 DECL_SAVED_FUNCTION_DATA (decl) = f;
12152 /* Clear out the bits we don't need. */
12153 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12154 f->bindings = NULL;
12155 f->x_local_names = NULL;
12159 /* Set the return value of the constructor (if present). */
12162 finish_constructor_body (void)
12167 if (targetm.cxx.cdtor_returns_this ()
12168 && (! TYPE_FOR_JAVA (current_class_type)))
12170 /* Any return from a constructor will end up here. */
12171 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12173 val = DECL_ARGUMENTS (current_function_decl);
12174 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12175 DECL_RESULT (current_function_decl), val);
12176 /* Return the address of the object. */
12177 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12178 add_stmt (exprstmt);
12182 /* Do all the processing for the beginning of a destructor; set up the
12183 vtable pointers and cleanups for bases and members. */
12186 begin_destructor_body (void)
12188 tree compound_stmt;
12190 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12191 issued an error message. We still want to try to process the
12192 body of the function, but initialize_vtbl_ptrs will crash if
12193 TYPE_BINFO is NULL. */
12194 if (COMPLETE_TYPE_P (current_class_type))
12196 compound_stmt = begin_compound_stmt (0);
12197 /* Make all virtual function table pointers in non-virtual base
12198 classes point to CURRENT_CLASS_TYPE's virtual function
12200 initialize_vtbl_ptrs (current_class_ptr);
12201 finish_compound_stmt (compound_stmt);
12203 /* And insert cleanups for our bases and members so that they
12204 will be properly destroyed if we throw. */
12205 push_base_cleanups ();
12209 /* At the end of every destructor we generate code to delete the object if
12210 necessary. Do that now. */
12213 finish_destructor_body (void)
12217 /* Any return from a destructor will end up here; that way all base
12218 and member cleanups will be run when the function returns. */
12219 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12221 /* In a virtual destructor, we must call delete. */
12222 if (DECL_VIRTUAL_P (current_function_decl))
12225 tree virtual_size = cxx_sizeof (current_class_type);
12229 At the point of definition of a virtual destructor (including
12230 an implicit definition), non-placement operator delete shall
12231 be looked up in the scope of the destructor's class and if
12232 found shall be accessible and unambiguous. */
12233 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12235 /*global_p=*/false,
12236 /*placement=*/NULL_TREE,
12237 /*alloc_fn=*/NULL_TREE);
12239 if_stmt = begin_if_stmt ();
12240 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12241 current_in_charge_parm,
12244 finish_expr_stmt (exprstmt);
12245 finish_then_clause (if_stmt);
12246 finish_if_stmt (if_stmt);
12249 if (targetm.cxx.cdtor_returns_this ())
12253 val = DECL_ARGUMENTS (current_function_decl);
12254 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12255 DECL_RESULT (current_function_decl), val);
12256 /* Return the address of the object. */
12257 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12258 add_stmt (exprstmt);
12262 /* Do the necessary processing for the beginning of a function body, which
12263 in this case includes member-initializers, but not the catch clauses of
12264 a function-try-block. Currently, this means opening a binding level
12265 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12268 begin_function_body (void)
12272 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12275 if (processing_template_decl)
12276 /* Do nothing now. */;
12278 /* Always keep the BLOCK node associated with the outermost pair of
12279 curly braces of a function. These are needed for correct
12280 operation of dwarfout.c. */
12281 keep_next_level (true);
12283 stmt = begin_compound_stmt (BCS_FN_BODY);
12285 if (processing_template_decl)
12286 /* Do nothing now. */;
12287 else if (DECL_DESTRUCTOR_P (current_function_decl))
12288 begin_destructor_body ();
12293 /* Do the processing for the end of a function body. Currently, this means
12294 closing out the cleanups for fully-constructed bases and members, and in
12295 the case of the destructor, deleting the object if desired. Again, this
12296 is only meaningful for [cd]tors, since they are the only functions where
12297 there is a significant distinction between the main body and any
12298 function catch clauses. Handling, say, main() return semantics here
12299 would be wrong, as flowing off the end of a function catch clause for
12300 main() would also need to return 0. */
12303 finish_function_body (tree compstmt)
12305 if (compstmt == NULL_TREE)
12308 /* Close the block. */
12309 finish_compound_stmt (compstmt);
12311 if (processing_template_decl)
12312 /* Do nothing now. */;
12313 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12314 finish_constructor_body ();
12315 else if (DECL_DESTRUCTOR_P (current_function_decl))
12316 finish_destructor_body ();
12319 /* Given a function, returns the BLOCK corresponding to the outermost level
12320 of curly braces, skipping the artificial block created for constructor
12324 outer_curly_brace_block (tree fndecl)
12326 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12327 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12328 /* Skip the artificial function body block. */
12329 block = BLOCK_SUBBLOCKS (block);
12333 /* Finish up a function declaration and compile that function
12334 all the way to assembler language output. The free the storage
12335 for the function definition.
12337 FLAGS is a bitwise or of the following values:
12339 We just finished processing the body of an in-class inline
12340 function definition. (This processing will have taken place
12341 after the class definition is complete.) */
12344 finish_function (int flags)
12346 tree fndecl = current_function_decl;
12347 tree fntype, ctype = NULL_TREE;
12348 int inclass_inline = (flags & 2) != 0;
12351 /* When we get some parse errors, we can end up without a
12352 current_function_decl, so cope. */
12353 if (fndecl == NULL_TREE)
12354 return error_mark_node;
12356 gcc_assert (!defer_mark_used_calls);
12357 defer_mark_used_calls = true;
12359 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12360 && DECL_VIRTUAL_P (fndecl)
12361 && !processing_template_decl)
12363 tree fnclass = DECL_CONTEXT (fndecl);
12364 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12365 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12368 nested = function_depth > 1;
12369 fntype = TREE_TYPE (fndecl);
12371 /* TREE_READONLY (fndecl) = 1;
12372 This caused &foo to be of type ptr-to-const-function
12373 which then got a warning when stored in a ptr-to-function variable. */
12375 gcc_assert (building_stmt_tree ());
12376 /* The current function is being defined, so its DECL_INITIAL should
12377 be set, and unless there's a multiple definition, it should be
12378 error_mark_node. */
12379 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12381 /* For a cloned function, we've already got all the code we need;
12382 there's no need to add any extra bits. */
12383 if (!DECL_CLONED_FUNCTION_P (fndecl))
12385 if (DECL_MAIN_P (current_function_decl))
12389 /* Make it so that `main' always returns 0 by default (or
12392 stmt = finish_return_stmt (integer_one_node);
12394 stmt = finish_return_stmt (integer_zero_node);
12396 /* Hack. We don't want the middle-end to warn that this
12397 return is unreachable, so put the statement on the
12400 location_t linezero = linemap_line_start (line_table, 0, 1);
12401 SET_EXPR_LOCATION (stmt, linezero);
12405 if (use_eh_spec_block (current_function_decl))
12406 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12407 (TREE_TYPE (current_function_decl)),
12408 current_eh_spec_block);
12411 /* If we're saving up tree structure, tie off the function now. */
12412 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12414 finish_fname_decls ();
12416 /* If this function can't throw any exceptions, remember that. */
12417 if (!processing_template_decl
12418 && !cp_function_chain->can_throw
12419 && !flag_non_call_exceptions
12420 && !DECL_REPLACEABLE_P (fndecl))
12421 TREE_NOTHROW (fndecl) = 1;
12423 /* This must come after expand_function_end because cleanups might
12424 have declarations (from inline functions) that need to go into
12425 this function's blocks. */
12427 /* If the current binding level isn't the outermost binding level
12428 for this function, either there is a bug, or we have experienced
12429 syntax errors and the statement tree is malformed. */
12430 if (current_binding_level->kind != sk_function_parms)
12432 /* Make sure we have already experienced errors. */
12433 gcc_assert (errorcount);
12435 /* Throw away the broken statement tree and extra binding
12437 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12439 while (current_binding_level->kind != sk_function_parms)
12441 if (current_binding_level->kind == sk_class)
12442 pop_nested_class ();
12444 poplevel (0, 0, 0);
12447 poplevel (1, 0, 1);
12449 /* Statements should always be full-expressions at the outermost set
12450 of curly braces for a function. */
12451 gcc_assert (stmts_are_full_exprs_p ());
12453 /* Set up the named return value optimization, if we can. Candidate
12454 variables are selected in check_return_expr. */
12455 if (current_function_return_value)
12457 tree r = current_function_return_value;
12460 if (r != error_mark_node
12461 /* This is only worth doing for fns that return in memory--and
12462 simpler, since we don't have to worry about promoted modes. */
12463 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12464 /* Only allow this for variables declared in the outer scope of
12465 the function so we know that their lifetime always ends with a
12466 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12467 we were to do this optimization in tree-ssa. */
12468 && (outer = outer_curly_brace_block (fndecl))
12469 && chain_member (r, BLOCK_VARS (outer)))
12470 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12472 current_function_return_value = NULL_TREE;
12475 /* Remember that we were in class scope. */
12476 if (current_class_name)
12477 ctype = current_class_type;
12479 /* Must mark the RESULT_DECL as being in this function. */
12480 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12482 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12483 to the FUNCTION_DECL node itself. */
12484 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12486 /* Save away current state, if appropriate. */
12487 if (!processing_template_decl)
12488 save_function_data (fndecl);
12490 /* Complain if there's just no return statement. */
12491 if (warn_return_type
12492 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12493 && !dependent_type_p (TREE_TYPE (fntype))
12494 && !current_function_returns_value && !current_function_returns_null
12495 /* Don't complain if we abort or throw. */
12496 && !current_function_returns_abnormally
12497 && !DECL_NAME (DECL_RESULT (fndecl))
12498 && !TREE_NO_WARNING (fndecl)
12499 /* Structor return values (if any) are set by the compiler. */
12500 && !DECL_CONSTRUCTOR_P (fndecl)
12501 && !DECL_DESTRUCTOR_P (fndecl))
12503 warning (OPT_Wreturn_type,
12504 "no return statement in function returning non-void");
12505 TREE_NO_WARNING (fndecl) = 1;
12508 /* Store the end of the function, so that we get good line number
12509 info for the epilogue. */
12510 cfun->function_end_locus = input_location;
12512 /* Genericize before inlining. */
12513 if (!processing_template_decl)
12515 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12516 invoke_plugin_callbacks (PLUGIN_CXX_CP_PRE_GENERICIZE, fndecl);
12517 cp_genericize (fndecl);
12518 /* Clear out the bits we don't need. */
12519 f->x_current_class_ptr = NULL;
12520 f->x_current_class_ref = NULL;
12521 f->x_eh_spec_block = NULL;
12522 f->x_in_charge_parm = NULL;
12523 f->x_vtt_parm = NULL;
12524 f->x_return_value = NULL;
12525 f->bindings = NULL;
12526 f->extern_decl_map = NULL;
12528 /* Clear out the bits we don't need. */
12529 local_names = NULL;
12531 /* We're leaving the context of this function, so zap cfun. It's still in
12532 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12534 current_function_decl = NULL;
12536 /* If this is an in-class inline definition, we may have to pop the
12537 bindings for the template parameters that we added in
12538 maybe_begin_member_template_processing when start_function was
12540 if (inclass_inline)
12541 maybe_end_member_template_processing ();
12543 /* Leave the scope of the class. */
12545 pop_nested_class ();
12551 /* Let the error reporting routines know that we're outside a
12552 function. For a nested function, this value is used in
12553 cxx_pop_function_context and then reset via pop_function_context. */
12554 current_function_decl = NULL_TREE;
12556 defer_mark_used_calls = false;
12557 if (deferred_mark_used_calls)
12562 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12564 VEC_free (tree, gc, deferred_mark_used_calls);
12570 /* Create the FUNCTION_DECL for a function definition.
12571 DECLSPECS and DECLARATOR are the parts of the declaration;
12572 they describe the return type and the name of the function,
12573 but twisted together in a fashion that parallels the syntax of C.
12575 This function creates a binding context for the function body
12576 as well as setting up the FUNCTION_DECL in current_function_decl.
12578 Returns a FUNCTION_DECL on success.
12580 If the DECLARATOR is not suitable for a function (it defines a datum
12581 instead), we return 0, which tells yyparse to report a parse error.
12583 May return void_type_node indicating that this method is actually
12584 a friend. See grokfield for more details.
12586 Came here with a `.pushlevel' .
12588 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12589 CHANGES TO CODE IN `grokfield'. */
12592 grokmethod (cp_decl_specifier_seq *declspecs,
12593 const cp_declarator *declarator, tree attrlist)
12595 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12598 if (fndecl == error_mark_node)
12599 return error_mark_node;
12601 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12603 error ("invalid member function declaration");
12604 return error_mark_node;
12608 cplus_decl_attributes (&fndecl, attrlist, 0);
12610 /* Pass friends other than inline friend functions back. */
12611 if (fndecl == void_type_node)
12614 if (DECL_IN_AGGR_P (fndecl))
12616 if (DECL_CONTEXT (fndecl)
12617 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12618 error ("%qD is already defined in class %qT", fndecl,
12619 DECL_CONTEXT (fndecl));
12620 return error_mark_node;
12623 check_template_shadow (fndecl);
12625 DECL_DECLARED_INLINE_P (fndecl) = 1;
12626 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12628 /* We process method specializations in finish_struct_1. */
12629 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12631 fndecl = push_template_decl (fndecl);
12632 if (fndecl == error_mark_node)
12636 if (! DECL_FRIEND_P (fndecl))
12638 if (TREE_CHAIN (fndecl))
12640 fndecl = copy_node (fndecl);
12641 TREE_CHAIN (fndecl) = NULL_TREE;
12645 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12647 DECL_IN_AGGR_P (fndecl) = 1;
12652 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12653 we can lay it out later, when and if its type becomes complete. */
12656 maybe_register_incomplete_var (tree var)
12658 gcc_assert (TREE_CODE (var) == VAR_DECL);
12660 /* Keep track of variables with incomplete types. */
12661 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12662 && DECL_EXTERNAL (var))
12664 tree inner_type = TREE_TYPE (var);
12666 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12667 inner_type = TREE_TYPE (inner_type);
12668 inner_type = TYPE_MAIN_VARIANT (inner_type);
12670 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12671 /* RTTI TD entries are created while defining the type_info. */
12672 || (TYPE_LANG_SPECIFIC (inner_type)
12673 && TYPE_BEING_DEFINED (inner_type)))
12674 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12678 /* Called when a class type (given by TYPE) is defined. If there are
12679 any existing VAR_DECLs whose type has been completed by this
12680 declaration, update them now. */
12683 complete_vars (tree type)
12685 tree *list = &incomplete_vars;
12687 gcc_assert (CLASS_TYPE_P (type));
12690 if (same_type_p (type, TREE_PURPOSE (*list)))
12692 tree var = TREE_VALUE (*list);
12693 tree type = TREE_TYPE (var);
12694 /* Complete the type of the variable. The VAR_DECL itself
12695 will be laid out in expand_expr. */
12696 complete_type (type);
12697 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12698 /* Remove this entry from the list. */
12699 *list = TREE_CHAIN (*list);
12702 list = &TREE_CHAIN (*list);
12705 /* Check for pending declarations which may have abstract type. */
12706 complete_type_check_abstract (type);
12709 /* If DECL is of a type which needs a cleanup, build and return an
12710 expression to perform that cleanup here. Return NULL_TREE if no
12711 cleanup need be done. */
12714 cxx_maybe_build_cleanup (tree decl)
12720 /* Assume no cleanup is required. */
12721 cleanup = NULL_TREE;
12723 if (error_operand_p (decl))
12726 /* Handle "__attribute__((cleanup))". We run the cleanup function
12727 before the destructor since the destructor is what actually
12728 terminates the lifetime of the object. */
12729 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12736 /* Get the name specified by the user for the cleanup function. */
12737 id = TREE_VALUE (TREE_VALUE (attr));
12738 /* Look up the name to find the cleanup function to call. It is
12739 important to use lookup_name here because that is what is
12740 used in c-common.c:handle_cleanup_attribute when performing
12741 initial checks on the attribute. Note that those checks
12742 include ensuring that the function found is not an overloaded
12743 function, or an object with an overloaded call operator,
12744 etc.; we can rely on the fact that the function found is an
12745 ordinary FUNCTION_DECL. */
12746 fn = lookup_name (id);
12747 arg = build_address (decl);
12749 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12751 tf_warning_or_error);
12753 /* Handle ordinary C++ destructors. */
12754 type = TREE_TYPE (decl);
12755 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12757 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12758 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12759 && CLASSTYPE_VBASECLASSES (type));
12763 if (TREE_CODE (type) == ARRAY_TYPE)
12766 addr = build_address (decl);
12768 /* Optimize for space over speed here. */
12769 if (!has_vbases || flag_expensive_optimizations)
12770 flags |= LOOKUP_NONVIRTUAL;
12772 call = build_delete (TREE_TYPE (addr), addr,
12773 sfk_complete_destructor, flags, 0);
12775 cleanup = build_compound_expr (input_location, cleanup, call);
12783 /* When a stmt has been parsed, this function is called. */
12790 /* DECL was originally constructed as a non-static member function,
12791 but turned out to be static. Update it accordingly. */
12794 revert_static_member_fn (tree decl)
12797 tree function = TREE_TYPE (decl);
12798 tree args = TYPE_ARG_TYPES (function);
12800 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12801 != TYPE_UNQUALIFIED)
12802 error ("static member function %q#D declared with type qualifiers", decl);
12804 args = TREE_CHAIN (args);
12805 tmp = build_function_type (TREE_TYPE (function), args);
12806 tmp = build_qualified_type (tmp, cp_type_quals (function));
12807 tmp = build_exception_variant (tmp,
12808 TYPE_RAISES_EXCEPTIONS (function));
12809 TREE_TYPE (decl) = tmp;
12810 if (DECL_ARGUMENTS (decl))
12811 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12812 DECL_STATIC_FUNCTION_P (decl) = 1;
12815 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12816 one of the language-independent trees. */
12818 enum cp_tree_node_structure_enum
12819 cp_tree_node_structure (union lang_tree_node * t)
12821 switch (TREE_CODE (&t->generic))
12823 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12824 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12825 case OVERLOAD: return TS_CP_OVERLOAD;
12826 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12827 case PTRMEM_CST: return TS_CP_PTRMEM;
12828 case BASELINK: return TS_CP_BASELINK;
12829 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12830 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12831 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12832 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
12833 default: return TS_CP_GENERIC;
12837 /* Build the void_list_node (void_type_node having been created). */
12839 build_void_list_node (void)
12841 tree t = build_tree_list (NULL_TREE, void_type_node);
12846 cp_missing_noreturn_ok_p (tree decl)
12848 /* A missing noreturn is ok for the `main' function. */
12849 return DECL_MAIN_P (decl);
12852 /* Return the COMDAT group into which DECL should be placed. */
12855 cxx_comdat_group (tree decl)
12859 /* Virtual tables, construction virtual tables, and virtual table
12860 tables all go in a single COMDAT group, named after the primary
12862 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12863 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12864 /* For all other DECLs, the COMDAT group is the mangled name of the
12865 declaration itself. */
12868 while (DECL_THUNK_P (decl))
12870 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12871 into the same section as the target function. In that case
12872 we must return target's name. */
12873 tree target = THUNK_TARGET (decl);
12874 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12875 && DECL_SECTION_NAME (target) != NULL
12876 && DECL_ONE_ONLY (target))
12881 name = DECL_ASSEMBLER_NAME (decl);
12887 #include "gt-cp-decl.h"