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)
7173 tree arg_types = TYPE_ARG_TYPES (member_type);
7174 cp_cv_quals quals = cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)));
7175 member_type = build_memfn_type (member_type, class_type, quals);
7176 return build_ptrmemfunc_type (build_pointer_type (member_type));
7180 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7181 return build_offset_type (class_type, member_type);
7185 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7186 Check to see that the definition is valid. Issue appropriate error
7187 messages. Return 1 if the definition is particularly bad, or 0
7191 check_static_variable_definition (tree decl, tree type)
7193 /* Motion 10 at San Diego: If a static const integral data member is
7194 initialized with an integral constant expression, the initializer
7195 may appear either in the declaration (within the class), or in
7196 the definition, but not both. If it appears in the class, the
7197 member is a member constant. The file-scope definition is always
7199 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7201 error ("invalid in-class initialization of static data member "
7202 "of non-integral type %qT",
7204 /* If we just return the declaration, crashes will sometimes
7205 occur. We therefore return void_type_node, as if this were a
7206 friend declaration, to cause callers to completely ignore
7207 this declaration. */
7210 else if (!CP_TYPE_CONST_P (type))
7211 error ("ISO C++ forbids in-class initialization of non-const "
7212 "static member %qD",
7214 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7215 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7216 "%qD of non-integral type %qT", decl, type);
7221 /* Given the SIZE (i.e., number of elements) in an array, compute an
7222 appropriate index type for the array. If non-NULL, NAME is the
7223 name of the thing being declared. */
7226 compute_array_index_type (tree name, tree size)
7230 tree abi_1_itype = NULL_TREE;
7232 if (error_operand_p (size))
7233 return error_mark_node;
7235 type = TREE_TYPE (size);
7236 /* The array bound must be an integer type. */
7237 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7240 error ("size of array %qD has non-integral type %qT", name, type);
7242 error ("size of array has non-integral type %qT", type);
7243 size = integer_one_node;
7244 type = TREE_TYPE (size);
7247 /* We can only call value_dependent_expression_p on integral constant
7248 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7249 set if this isn't one. */
7250 if (processing_template_decl
7251 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7253 /* We cannot do any checking for a SIZE that isn't known to be
7254 constant. Just build the index type and mark that it requires
7255 structural equality checks. */
7256 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7257 size, integer_one_node));
7258 if (!TREE_SIDE_EFFECTS (size))
7260 TYPE_DEPENDENT_P (itype) = 1;
7261 TYPE_DEPENDENT_P_VALID (itype) = 1;
7263 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7267 if (!abi_version_at_least (2) && processing_template_decl)
7268 /* For abi-1, we handled all instances in templates the same way,
7269 even when they were non-dependent. This affects the manglings
7270 produced. So, we do the normal checking for non-dependent
7271 sizes, but at the end we'll return the same type that abi-1
7272 would have, but with TYPE_CANONICAL set to the "right"
7273 value that the current ABI would provide. */
7274 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7275 size, integer_one_node));
7277 /* The size might be the result of a cast. */
7278 STRIP_TYPE_NOPS (size);
7280 /* It might be a const variable or enumeration constant. */
7281 size = integral_constant_value (size);
7283 /* Normally, the array-bound will be a constant. */
7284 if (TREE_CODE (size) == INTEGER_CST)
7286 /* Check to see if the array bound overflowed. Make that an
7287 error, no matter how generous we're being. */
7288 constant_expression_error (size);
7290 /* An array must have a positive number of elements. */
7291 if (INT_CST_LT (size, integer_zero_node))
7294 error ("size of array %qD is negative", name);
7296 error ("size of array is negative");
7297 size = integer_one_node;
7299 /* As an extension we allow zero-sized arrays. We always allow
7300 them in system headers because glibc uses them. */
7301 else if (integer_zerop (size) && !in_system_header)
7304 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7306 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7309 else if (TREE_CONSTANT (size))
7311 /* `(int) &fn' is not a valid array bound. */
7313 error ("size of array %qD is not an integral constant-expression",
7316 error ("size of array is not an integral constant-expression");
7317 size = integer_one_node;
7319 else if (pedantic && warn_vla != 0)
7322 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7324 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7326 else if (warn_vla > 0)
7330 "variable length array %qD is used", name);
7333 "variable length array is used");
7336 if (processing_template_decl && !TREE_CONSTANT (size))
7337 /* A variable sized array. */
7338 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7341 HOST_WIDE_INT saved_processing_template_decl;
7343 /* Compute the index of the largest element in the array. It is
7344 one less than the number of elements in the array. We save
7345 and restore PROCESSING_TEMPLATE_DECL so that computations in
7346 cp_build_binary_op will be appropriately folded. */
7347 saved_processing_template_decl = processing_template_decl;
7348 processing_template_decl = 0;
7349 itype = cp_build_binary_op (input_location,
7351 cp_convert (ssizetype, size),
7352 cp_convert (ssizetype, integer_one_node),
7353 tf_warning_or_error);
7354 itype = fold (itype);
7355 processing_template_decl = saved_processing_template_decl;
7357 if (!TREE_CONSTANT (itype))
7358 /* A variable sized array. */
7359 itype = variable_size (itype);
7360 /* Make sure that there was no overflow when creating to a signed
7361 index type. (For example, on a 32-bit machine, an array with
7362 size 2^32 - 1 is too big.) */
7363 else if (TREE_CODE (itype) == INTEGER_CST
7364 && TREE_OVERFLOW (itype))
7366 error ("overflow in array dimension");
7367 TREE_OVERFLOW (itype) = 0;
7371 /* Create and return the appropriate index type. */
7374 tree t = build_index_type (itype);
7375 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7379 return build_index_type (itype);
7382 /* Returns the scope (if any) in which the entity declared by
7383 DECLARATOR will be located. If the entity was declared with an
7384 unqualified name, NULL_TREE is returned. */
7387 get_scope_of_declarator (const cp_declarator *declarator)
7389 while (declarator && declarator->kind != cdk_id)
7390 declarator = declarator->declarator;
7392 /* If the declarator-id is a SCOPE_REF, the scope in which the
7393 declaration occurs is the first operand. */
7395 && declarator->u.id.qualifying_scope)
7396 return declarator->u.id.qualifying_scope;
7398 /* Otherwise, the declarator is not a qualified name; the entity will
7399 be declared in the current scope. */
7403 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7404 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7408 create_array_type_for_decl (tree name, tree type, tree size)
7410 tree itype = NULL_TREE;
7411 const char* error_msg;
7413 /* If things have already gone awry, bail now. */
7414 if (type == error_mark_node || size == error_mark_node)
7415 return error_mark_node;
7417 /* Assume that everything will go OK. */
7420 /* There are some types which cannot be array elements. */
7421 switch (TREE_CODE (type))
7424 error_msg = "array of void";
7428 error_msg = "array of functions";
7431 case REFERENCE_TYPE:
7432 error_msg = "array of references";
7436 error_msg = "array of function members";
7443 /* If something went wrong, issue an error-message and return. */
7447 error ("declaration of %qD as %s", name, error_msg);
7449 error ("creating %s", error_msg);
7451 return error_mark_node;
7456 The constant expressions that specify the bounds of the arrays
7457 can be omitted only for the first member of the sequence. */
7458 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7461 error ("declaration of %qD as multidimensional array must "
7462 "have bounds for all dimensions except the first",
7465 error ("multidimensional array must have bounds for all "
7466 "dimensions except the first");
7468 return error_mark_node;
7471 /* Figure out the index type for the array. */
7473 itype = compute_array_index_type (name, size);
7476 T is called the array element type; this type shall not be [...] an
7477 abstract class type. */
7478 abstract_virtuals_error (name, type);
7480 return build_cplus_array_type (type, itype);
7483 /* Check that it's OK to declare a function with the indicated TYPE.
7484 SFK indicates the kind of special function (if any) that this
7485 function is. OPTYPE is the type given in a conversion operator
7486 declaration, or the class type for a constructor/destructor.
7487 Returns the actual return type of the function; that
7488 may be different than TYPE if an error occurs, or for certain
7489 special functions. */
7492 check_special_function_return_type (special_function_kind sfk,
7498 case sfk_constructor:
7500 error ("return type specification for constructor invalid");
7502 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7503 type = build_pointer_type (optype);
7505 type = void_type_node;
7508 case sfk_destructor:
7510 error ("return type specification for destructor invalid");
7511 /* We can't use the proper return type here because we run into
7512 problems with ambiguous bases and covariant returns.
7513 Java classes are left unchanged because (void *) isn't a valid
7514 Java type, and we don't want to change the Java ABI. */
7515 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7516 type = build_pointer_type (void_type_node);
7518 type = void_type_node;
7521 case sfk_conversion:
7523 error ("return type specified for %<operator %T%>", optype);
7534 /* A variable or data member (whose unqualified name is IDENTIFIER)
7535 has been declared with the indicated TYPE. If the TYPE is not
7536 acceptable, issue an error message and return a type to use for
7537 error-recovery purposes. */
7540 check_var_type (tree identifier, tree type)
7542 if (VOID_TYPE_P (type))
7545 error ("unnamed variable or field declared void");
7546 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7548 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7549 error ("variable or field %qE declared void", identifier);
7552 error ("variable or field declared void");
7553 type = error_mark_node;
7559 /* Given declspecs and a declarator (abstract or otherwise), determine
7560 the name and type of the object declared and construct a DECL node
7563 DECLSPECS points to the representation of declaration-specifier
7564 sequence that precedes declarator.
7566 DECL_CONTEXT says which syntactic context this declaration is in:
7567 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7568 FUNCDEF for a function definition. Like NORMAL but a few different
7569 error messages in each case. Return value may be zero meaning
7570 this definition is too screwy to try to parse.
7571 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7572 handle member functions (which have FIELD context).
7573 Return value may be zero meaning this definition is too screwy to
7575 PARM for a parameter declaration (either within a function prototype
7576 or before a function body). Make a PARM_DECL, or return void_type_node.
7577 CATCHPARM for a parameter declaration before a catch clause.
7578 TYPENAME if for a typename (in a cast or sizeof).
7579 Don't make a DECL node; just return the ..._TYPE node.
7580 FIELD for a struct or union field; make a FIELD_DECL.
7581 BITFIELD for a field with specified width.
7582 INITIALIZED is as for start_decl.
7584 ATTRLIST is a pointer to the list of attributes, which may be NULL
7585 if there are none; *ATTRLIST may be modified if attributes from inside
7586 the declarator should be applied to the declaration.
7588 When this function is called, scoping variables (such as
7589 CURRENT_CLASS_TYPE) should reflect the scope in which the
7590 declaration occurs, not the scope in which the new declaration will
7591 be placed. For example, on:
7595 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7598 Returns a DECL (if a declarator is present), a TYPE (if there is no
7599 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7603 grokdeclarator (const cp_declarator *declarator,
7604 const cp_decl_specifier_seq *declspecs,
7605 enum decl_context decl_context,
7609 tree type = NULL_TREE;
7611 int virtualp, explicitp, friendp, inlinep, staticp;
7612 int explicit_int = 0;
7613 int explicit_char = 0;
7614 int defaulted_int = 0;
7615 tree dependent_name = NULL_TREE;
7617 tree typedef_decl = NULL_TREE;
7618 const char *name = NULL;
7619 tree typedef_type = NULL_TREE;
7620 /* True if this declarator is a function definition. */
7621 bool funcdef_flag = false;
7622 cp_declarator_kind innermost_code = cdk_error;
7625 /* See the code below that used this. */
7626 tree decl_attr = NULL_TREE;
7629 /* Keep track of what sort of function is being processed
7630 so that we can warn about default return values, or explicit
7631 return values which do not match prescribed defaults. */
7632 special_function_kind sfk = sfk_none;
7634 tree dname = NULL_TREE;
7635 tree ctor_return_type = NULL_TREE;
7636 enum overload_flags flags = NO_SPECIAL;
7637 /* cv-qualifiers that apply to the declarator, for a declaration of
7638 a member function. */
7639 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7640 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7642 tree raises = NULL_TREE;
7643 int template_count = 0;
7644 tree returned_attrs = NULL_TREE;
7645 tree parms = NULL_TREE;
7646 const cp_declarator *id_declarator;
7647 /* The unqualified name of the declarator; either an
7648 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7649 tree unqualified_id;
7650 /* The class type, if any, in which this entity is located,
7651 or NULL_TREE if none. Note that this value may be different from
7652 the current class type; for example if an attempt is made to declare
7653 "A::f" inside "B", this value will be "A". */
7654 tree ctype = current_class_type;
7655 /* The NAMESPACE_DECL for the namespace in which this entity is
7656 located. If an unqualified name is used to declare the entity,
7657 this value will be NULL_TREE, even if the entity is located at
7659 tree in_namespace = NULL_TREE;
7660 cp_storage_class storage_class;
7661 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7662 bool type_was_error_mark_node = false;
7663 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7664 bool template_type_arg = false;
7665 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7668 signed_p = declspecs->specs[(int)ds_signed];
7669 unsigned_p = declspecs->specs[(int)ds_unsigned];
7670 short_p = declspecs->specs[(int)ds_short];
7671 long_p = declspecs->specs[(int)ds_long];
7672 longlong = declspecs->specs[(int)ds_long] >= 2;
7673 thread_p = declspecs->specs[(int)ds_thread];
7675 if (decl_context == FUNCDEF)
7676 funcdef_flag = true, decl_context = NORMAL;
7677 else if (decl_context == MEMFUNCDEF)
7678 funcdef_flag = true, decl_context = FIELD;
7679 else if (decl_context == BITFIELD)
7680 bitfield = 1, decl_context = FIELD;
7681 else if (decl_context == TEMPLATE_TYPE_ARG)
7682 template_type_arg = true, decl_context = TYPENAME;
7684 if (initialized > 1)
7685 funcdef_flag = true;
7687 /* Look inside a declarator for the name being declared
7688 and get it as a string, for an error message. */
7689 for (id_declarator = declarator;
7691 id_declarator = id_declarator->declarator)
7693 if (id_declarator->kind != cdk_id)
7694 innermost_code = id_declarator->kind;
7696 switch (id_declarator->kind)
7699 if (id_declarator->declarator
7700 && id_declarator->declarator->kind == cdk_id)
7702 sfk = id_declarator->declarator->u.id.sfk;
7703 if (sfk == sfk_destructor)
7710 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7711 tree decl = id_declarator->u.id.unqualified_name;
7714 if (qualifying_scope)
7716 if (at_function_scope_p ())
7720 A declarator-id shall not be qualified except
7723 None of the cases are permitted in block
7725 if (qualifying_scope == global_namespace)
7726 error ("invalid use of qualified-name %<::%D%>",
7728 else if (TYPE_P (qualifying_scope))
7729 error ("invalid use of qualified-name %<%T::%D%>",
7730 qualifying_scope, decl);
7732 error ("invalid use of qualified-name %<%D::%D%>",
7733 qualifying_scope, decl);
7734 return error_mark_node;
7736 else if (TYPE_P (qualifying_scope))
7738 ctype = qualifying_scope;
7739 if (innermost_code != cdk_function
7740 && current_class_type
7741 && !UNIQUELY_DERIVED_FROM_P (ctype,
7742 current_class_type))
7744 error ("type %qT is not derived from type %qT",
7745 ctype, current_class_type);
7746 return error_mark_node;
7749 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7750 in_namespace = qualifying_scope;
7752 switch (TREE_CODE (decl))
7758 if (innermost_code != cdk_function)
7760 error ("declaration of %qD as non-function", decl);
7761 return error_mark_node;
7763 else if (!qualifying_scope
7764 && !(current_class_type && at_class_scope_p ()))
7766 error ("declaration of %qD as non-member", decl);
7767 return error_mark_node;
7770 type = TREE_OPERAND (decl, 0);
7772 type = constructor_name (type);
7773 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7778 case TEMPLATE_ID_EXPR:
7780 tree fns = TREE_OPERAND (decl, 0);
7783 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7785 gcc_assert (is_overloaded_fn (dname));
7786 dname = DECL_NAME (get_first_fn (dname));
7791 case IDENTIFIER_NODE:
7792 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7795 if (C_IS_RESERVED_WORD (dname))
7797 error ("declarator-id missing; using reserved word %qD",
7799 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7801 else if (!IDENTIFIER_TYPENAME_P (dname))
7802 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7805 gcc_assert (flags == NO_SPECIAL);
7806 flags = TYPENAME_FLAG;
7807 ctor_return_type = TREE_TYPE (dname);
7808 sfk = sfk_conversion;
7809 if (is_typename_at_global_scope (dname))
7810 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7812 name = "<invalid operator>";
7829 return error_mark_node;
7834 if (id_declarator->kind == cdk_id)
7840 The declarator in a function-definition shall have the form
7841 D1 ( parameter-declaration-clause) ... */
7842 if (funcdef_flag && innermost_code != cdk_function)
7844 error ("function definition does not declare parameters");
7845 return error_mark_node;
7848 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7849 && innermost_code != cdk_function
7850 && ! (ctype && !declspecs->any_specifiers_p))
7852 error ("declaration of %qD as non-function", dname);
7853 return error_mark_node;
7856 /* Anything declared one level down from the top level
7857 must be one of the parameters of a function
7858 (because the body is at least two levels down). */
7860 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7861 by not allowing C++ class definitions to specify their parameters
7862 with xdecls (must be spec.d in the parmlist).
7864 Since we now wait to push a class scope until we are sure that
7865 we are in a legitimate method context, we must set oldcname
7866 explicitly (since current_class_name is not yet alive).
7868 We also want to avoid calling this a PARM if it is in a namespace. */
7870 if (decl_context == NORMAL && !toplevel_bindings_p ())
7872 struct cp_binding_level *b = current_binding_level;
7873 current_binding_level = b->level_chain;
7874 if (current_binding_level != 0 && toplevel_bindings_p ())
7875 decl_context = PARM;
7876 current_binding_level = b;
7880 name = decl_context == PARM ? "parameter" : "type name";
7882 /* If there were multiple types specified in the decl-specifier-seq,
7883 issue an error message. */
7884 if (declspecs->multiple_types_p)
7886 error ("two or more data types in declaration of %qs", name);
7887 return error_mark_node;
7890 if (declspecs->conflicting_specifiers_p)
7892 error ("conflicting specifiers in declaration of %qs", name);
7893 return error_mark_node;
7896 /* Extract the basic type from the decl-specifier-seq. */
7897 type = declspecs->type;
7898 if (type == error_mark_node)
7901 type_was_error_mark_node = true;
7903 /* If the entire declaration is itself tagged as deprecated then
7904 suppress reports of deprecated items. */
7905 if (type && TREE_DEPRECATED (type)
7906 && deprecated_state != DEPRECATED_SUPPRESS)
7907 warn_deprecated_use (type, NULL_TREE);
7908 if (type && TREE_CODE (type) == TYPE_DECL)
7910 typedef_decl = type;
7911 type = TREE_TYPE (typedef_decl);
7912 if (TREE_DEPRECATED (type)
7913 && DECL_ARTIFICIAL (typedef_decl)
7914 && deprecated_state != DEPRECATED_SUPPRESS)
7915 warn_deprecated_use (type, NULL_TREE);
7917 /* No type at all: default to `int', and set DEFAULTED_INT
7918 because it was not a user-defined typedef. */
7919 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7921 /* These imply 'int'. */
7922 type = integer_type_node;
7926 explicit_int = declspecs->explicit_int_p;
7927 explicit_char = declspecs->explicit_char_p;
7930 /* See the code below that used this. */
7932 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7934 typedef_type = type;
7937 if (sfk != sfk_conversion)
7938 ctor_return_type = ctype;
7940 if (sfk != sfk_none)
7941 type = check_special_function_return_type (sfk, type,
7943 else if (type == NULL_TREE)
7949 /* We handle `main' specially here, because 'main () { }' is so
7950 common. With no options, it is allowed. With -Wreturn-type,
7951 it is a warning. It is only an error with -pedantic-errors. */
7952 is_main = (funcdef_flag
7953 && dname && MAIN_NAME_P (dname)
7954 && ctype == NULL_TREE
7955 && in_namespace == NULL_TREE
7956 && current_namespace == global_namespace);
7958 if (type_was_error_mark_node)
7959 /* We've already issued an error, don't complain more. */;
7960 else if (in_system_header || flag_ms_extensions)
7961 /* Allow it, sigh. */;
7963 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7965 pedwarn (input_location, OPT_pedantic,
7966 "ISO C++ forbids declaration of %qs with no type", name);
7968 warning (OPT_Wreturn_type,
7969 "ISO C++ forbids declaration of %qs with no type", name);
7971 type = integer_type_node;
7976 /* Now process the modifiers that were specified
7977 and check for invalid combinations. */
7979 /* Long double is a special combination. */
7980 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7983 type = build_qualified_type (long_double_type_node,
7984 cp_type_quals (type));
7987 /* Check all other uses of type modifiers. */
7989 if (unsigned_p || signed_p || long_p || short_p)
7993 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7994 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7995 else if (signed_p && unsigned_p)
7996 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7997 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7998 error ("%<long long%> invalid for %qs", name);
7999 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8000 error ("%<long%> invalid for %qs", name);
8001 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8002 error ("%<short%> invalid for %qs", name);
8003 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8004 error ("%<long%> or %<short%> invalid for %qs", name);
8005 else if ((long_p || short_p) && explicit_char)
8006 error ("%<long%> or %<short%> specified with char for %qs", name);
8007 else if (long_p && short_p)
8008 error ("%<long%> and %<short%> specified together for %qs", name);
8009 else if (type == char16_type_node || type == char32_type_node)
8011 if (signed_p || unsigned_p)
8012 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8013 else if (short_p || long_p)
8014 error ("%<short%> or %<long%> invalid for %qs", name);
8019 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
8021 pedwarn (input_location, OPT_pedantic,
8022 "long, short, signed or unsigned used invalidly for %qs",
8024 if (flag_pedantic_errors)
8029 /* Discard the type modifiers if they are invalid. */
8040 /* Decide whether an integer type is signed or not.
8041 Optionally treat bitfields as signed by default. */
8045 It is implementation-defined whether a plain (neither
8046 explicitly signed or unsigned) char, short, int, or long
8047 bit-field is signed or unsigned.
8049 Naturally, we extend this to long long as well. Note that
8050 this does not include wchar_t. */
8051 || (bitfield && !flag_signed_bitfields
8053 /* A typedef for plain `int' without `signed' can be
8054 controlled just like plain `int', but a typedef for
8055 `signed int' cannot be so controlled. */
8057 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8058 && TREE_CODE (type) == INTEGER_TYPE
8059 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8062 type = long_long_unsigned_type_node;
8064 type = long_unsigned_type_node;
8066 type = short_unsigned_type_node;
8067 else if (type == char_type_node)
8068 type = unsigned_char_type_node;
8069 else if (typedef_decl)
8070 type = unsigned_type_for (type);
8072 type = unsigned_type_node;
8074 else if (signed_p && type == char_type_node)
8075 type = signed_char_type_node;
8077 type = long_long_integer_type_node;
8079 type = long_integer_type_node;
8081 type = short_integer_type_node;
8083 if (declspecs->specs[(int)ds_complex])
8085 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8086 error ("complex invalid for %qs", name);
8087 /* If we just have "complex", it is equivalent to
8088 "complex double", but if any modifiers at all are specified it is
8089 the complex form of TYPE. E.g, "complex short" is
8090 "complex short int". */
8092 else if (defaulted_int && ! longlong
8093 && ! (long_p || short_p || signed_p || unsigned_p))
8094 type = complex_double_type_node;
8095 else if (type == integer_type_node)
8096 type = complex_integer_type_node;
8097 else if (type == float_type_node)
8098 type = complex_float_type_node;
8099 else if (type == double_type_node)
8100 type = complex_double_type_node;
8101 else if (type == long_double_type_node)
8102 type = complex_long_double_type_node;
8104 type = build_complex_type (type);
8107 type_quals = TYPE_UNQUALIFIED;
8108 if (declspecs->specs[(int)ds_const])
8109 type_quals |= TYPE_QUAL_CONST;
8110 /* A `constexpr' specifier used in an object declaration declares
8111 the object as `const'. */
8114 if (innermost_code == cdk_function)
8116 else if (declspecs->specs[(int)ds_const] != 0)
8117 error ("both %<const%> and %<constexpr%> cannot be used here");
8119 type_quals |= TYPE_QUAL_CONST;
8121 if (declspecs->specs[(int)ds_volatile])
8122 type_quals |= TYPE_QUAL_VOLATILE;
8123 if (declspecs->specs[(int)ds_restrict])
8124 type_quals |= TYPE_QUAL_RESTRICT;
8125 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8126 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8129 if (TREE_CODE (type) == FUNCTION_TYPE
8130 && type_quals != TYPE_UNQUALIFIED)
8132 /* This was an error in C++98 (cv-qualifiers cannot be added to
8133 a function type), but DR 295 makes the code well-formed by
8134 dropping the extra qualifiers. */
8137 tree bad_type = build_qualified_type (type, type_quals);
8138 pedwarn (input_location, OPT_pedantic,
8139 "ignoring %qV qualifiers added to function type %qT",
8142 type_quals = TYPE_UNQUALIFIED;
8144 type_quals |= cp_type_quals (type);
8145 type = cp_build_qualified_type_real
8146 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8147 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8148 /* We might have ignored or rejected some of the qualifiers. */
8149 type_quals = cp_type_quals (type);
8152 inlinep = !! declspecs->specs[(int)ds_inline];
8153 virtualp = !! declspecs->specs[(int)ds_virtual];
8154 explicitp = !! declspecs->specs[(int)ds_explicit];
8156 storage_class = declspecs->storage_class;
8157 if (storage_class == sc_static)
8158 staticp = 1 + (decl_context == FIELD);
8160 if (virtualp && staticp == 2)
8162 error ("member %qD cannot be declared both virtual and static", dname);
8163 storage_class = sc_none;
8166 friendp = !! declspecs->specs[(int)ds_friend];
8168 if (dependent_name && !friendp)
8170 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8171 return error_mark_node;
8174 /* Issue errors about use of storage classes for parameters. */
8175 if (decl_context == PARM)
8177 if (declspecs->specs[(int)ds_typedef])
8179 error ("typedef declaration invalid in parameter declaration");
8180 return error_mark_node;
8182 else if (storage_class == sc_static
8183 || storage_class == sc_extern
8185 error ("storage class specifiers invalid in parameter declarations");
8187 if (type_uses_auto (type))
8189 error ("parameter declared %<auto%>");
8190 type = error_mark_node;
8193 /* Function parameters cannot be constexpr. If we saw one, moan
8194 and pretend it wasn't there. */
8197 error ("a parameter cannot be declared %<constexpr%>");
8202 /* Give error if `virtual' is used outside of class declaration. */
8204 && (current_class_name == NULL_TREE || decl_context != FIELD))
8206 error ("%<virtual%> outside class declaration");
8210 /* Static anonymous unions are dealt with here. */
8211 if (staticp && decl_context == TYPENAME
8213 && ANON_AGGR_TYPE_P (declspecs->type))
8214 decl_context = FIELD;
8216 /* Warn about storage classes that are invalid for certain
8217 kinds of declarations (parameters, typenames, etc.). */
8220 && storage_class != sc_extern
8221 && storage_class != sc_static)
8222 || declspecs->specs[(int)ds_typedef]))
8224 error ("multiple storage classes in declaration of %qs", name);
8227 if (decl_context != NORMAL
8228 && ((storage_class != sc_none
8229 && storage_class != sc_mutable)
8232 if ((decl_context == PARM || decl_context == CATCHPARM)
8233 && (storage_class == sc_register
8234 || storage_class == sc_auto))
8236 else if (declspecs->specs[(int)ds_typedef])
8238 else if (decl_context == FIELD
8239 /* C++ allows static class elements. */
8240 && storage_class == sc_static)
8241 /* C++ also allows inlines and signed and unsigned elements,
8242 but in those cases we don't come in here. */
8246 if (decl_context == FIELD)
8247 error ("storage class specified for %qs", name);
8250 if (decl_context == PARM || decl_context == CATCHPARM)
8251 error ("storage class specified for parameter %qs", name);
8253 error ("storage class specified for typename");
8255 if (storage_class == sc_register
8256 || storage_class == sc_auto
8257 || storage_class == sc_extern
8259 storage_class = sc_none;
8262 else if (storage_class == sc_extern && funcdef_flag
8263 && ! toplevel_bindings_p ())
8264 error ("nested function %qs declared %<extern%>", name);
8265 else if (toplevel_bindings_p ())
8267 if (storage_class == sc_auto)
8268 error ("top-level declaration of %qs specifies %<auto%>", name);
8271 && storage_class != sc_extern
8272 && storage_class != sc_static)
8274 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8279 if (storage_class && friendp)
8281 error ("storage class specifiers invalid in friend function declarations");
8282 storage_class = sc_none;
8287 unqualified_id = NULL_TREE;
8290 unqualified_id = id_declarator->u.id.unqualified_name;
8291 switch (TREE_CODE (unqualified_id))
8294 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8295 if (TYPE_P (unqualified_id))
8296 unqualified_id = constructor_name (unqualified_id);
8299 case IDENTIFIER_NODE:
8300 case TEMPLATE_ID_EXPR:
8308 /* Determine the type of the entity declared by recurring on the
8310 for (; declarator; declarator = declarator->declarator)
8312 const cp_declarator *inner_declarator;
8315 if (type == error_mark_node)
8316 return error_mark_node;
8318 attrs = declarator->attributes;
8324 if (declarator == NULL || declarator->kind == cdk_id)
8325 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8326 if (declarator->kind == cdk_function)
8327 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8328 if (declarator->kind == cdk_array)
8329 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8330 returned_attrs = decl_attributes (&type,
8331 chainon (returned_attrs, attrs),
8335 if (declarator->kind == cdk_id)
8338 inner_declarator = declarator->declarator;
8340 switch (declarator->kind)
8343 type = create_array_type_for_decl (dname, type,
8344 declarator->u.array.bounds);
8352 /* Declaring a function type.
8353 Make sure we have a valid type for the function to return. */
8355 if (type_quals != TYPE_UNQUALIFIED)
8357 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8358 warning (OPT_Wignored_qualifiers,
8359 "type qualifiers ignored on function return type");
8360 /* We now know that the TYPE_QUALS don't apply to the
8361 decl, but to its return type. */
8362 type_quals = TYPE_UNQUALIFIED;
8364 errmsg = targetm.invalid_return_type (type);
8368 type = integer_type_node;
8371 /* Error about some types functions can't return. */
8373 if (TREE_CODE (type) == FUNCTION_TYPE)
8375 error ("%qs declared as function returning a function", name);
8376 return error_mark_node;
8378 if (TREE_CODE (type) == ARRAY_TYPE)
8380 error ("%qs declared as function returning an array", name);
8381 return error_mark_node;
8384 /* Pick up type qualifiers which should be applied to `this'. */
8385 memfn_quals = declarator->u.function.qualifiers;
8387 /* Pick up the exception specifications. */
8388 raises = declarator->u.function.exception_specification;
8390 /* Say it's a definition only for the CALL_EXPR
8391 closest to the identifier. */
8392 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8394 /* Handle a late-specified return type. */
8397 if (type_uses_auto (type))
8399 if (!declarator->u.function.late_return_type)
8401 error ("%qs function uses %<auto%> type specifier without"
8402 " late return type", name);
8403 return error_mark_node;
8405 else if (!is_auto (type))
8407 error ("%qs function with late return type has"
8408 " %qT as its type rather than plain %<auto%>",
8410 return error_mark_node;
8413 else if (declarator->u.function.late_return_type)
8415 error ("%qs function with late return type not declared"
8416 " with %<auto%> type specifier", name);
8417 return error_mark_node;
8420 type = splice_late_return_type
8421 (type, declarator->u.function.late_return_type);
8422 if (type == error_mark_node)
8423 return error_mark_node;
8425 if (ctype == NULL_TREE
8426 && decl_context == FIELD
8428 && (friendp == 0 || dname == current_class_name))
8429 ctype = current_class_type;
8431 if (ctype && (sfk == sfk_constructor
8432 || sfk == sfk_destructor))
8434 /* We are within a class's scope. If our declarator name
8435 is the same as the class name, and we are defining
8436 a function, then it is a constructor/destructor, and
8437 therefore returns a void type. */
8439 /* ISO C++ 12.4/2. A destructor may not be declared
8440 const or volatile. A destructor may not be
8443 ISO C++ 12.1. A constructor may not be declared
8444 const or volatile. A constructor may not be
8445 virtual. A constructor may not be static. */
8447 error ((flags == DTOR_FLAG)
8448 ? "destructor cannot be static member function"
8449 : "constructor cannot be static member function");
8452 error ((flags == DTOR_FLAG)
8453 ? "destructors may not be cv-qualified"
8454 : "constructors may not be cv-qualified");
8455 memfn_quals = TYPE_UNQUALIFIED;
8458 if (decl_context == FIELD
8459 && !member_function_or_else (ctype,
8462 return error_mark_node;
8464 if (flags != DTOR_FLAG)
8466 /* It's a constructor. */
8471 permerror (input_location, "constructors cannot be declared virtual");
8474 if (decl_context == FIELD
8475 && sfk != sfk_constructor)
8476 return error_mark_node;
8478 if (decl_context == FIELD)
8484 error ("can't initialize friend function %qs", name);
8487 /* Cannot be both friend and virtual. */
8488 error ("virtual functions cannot be friends");
8491 if (decl_context == NORMAL)
8492 error ("friend declaration not in class definition");
8493 if (current_function_decl && funcdef_flag)
8494 error ("can't define friend function %qs in a local "
8498 else if (ctype && sfk == sfk_conversion)
8502 maybe_warn_cpp0x ("explicit conversion operators");
8507 /* It is not allowed to use `constexpr' in a function
8508 declaration that is not a definition.
8509 That is too strict, though. */
8510 if (constexpr_p && !funcdef_flag)
8512 error ("the %<constexpr%> specifier cannot be used in "
8513 "a function declaration that is not a definition");
8514 constexpr_p = false;
8517 /* A constexpr non-static member function is implicitly const. */
8518 if (constexpr_p && decl_context == FIELD && staticp == 0
8519 && sfk != sfk_constructor && sfk != sfk_destructor)
8520 memfn_quals |= TYPE_QUAL_CONST;
8522 arg_types = grokparms (declarator->u.function.parameters,
8525 if (inner_declarator
8526 && inner_declarator->kind == cdk_id
8527 && inner_declarator->u.id.sfk == sfk_destructor
8528 && arg_types != void_list_node)
8530 error ("destructors may not have parameters");
8531 arg_types = void_list_node;
8535 type = build_function_type (type, arg_types);
8542 /* Filter out pointers-to-references and references-to-references.
8543 We can get these if a TYPE_DECL is used. */
8545 if (TREE_CODE (type) == REFERENCE_TYPE)
8547 if (declarator->kind != cdk_reference)
8549 error ("cannot declare pointer to %q#T", type);
8550 type = TREE_TYPE (type);
8553 /* In C++0x, we allow reference to reference declarations
8554 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8555 and template type arguments [14.3.1/4 temp.arg.type]. The
8556 check for direct reference to reference declarations, which
8557 are still forbidden, occurs below. Reasoning behind the change
8558 can be found in DR106, DR540, and the rvalue reference
8560 else if (cxx_dialect == cxx98)
8562 error ("cannot declare reference to %q#T", type);
8563 type = TREE_TYPE (type);
8566 else if (VOID_TYPE_P (type))
8568 if (declarator->kind == cdk_reference)
8569 error ("cannot declare reference to %q#T", type);
8570 else if (declarator->kind == cdk_ptrmem)
8571 error ("cannot declare pointer to %q#T member", type);
8574 /* We now know that the TYPE_QUALS don't apply to the decl,
8575 but to the target of the pointer. */
8576 type_quals = TYPE_UNQUALIFIED;
8578 if (declarator->kind == cdk_ptrmem
8579 && (TREE_CODE (type) == FUNCTION_TYPE
8580 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8582 memfn_quals |= cp_type_quals (type);
8583 type = build_memfn_type (type,
8584 declarator->u.pointer.class_type,
8586 memfn_quals = TYPE_UNQUALIFIED;
8589 if (TREE_CODE (type) == FUNCTION_TYPE
8590 && cp_type_quals (type) != TYPE_UNQUALIFIED)
8591 error ("cannot declare %s to qualified function type %qT",
8592 declarator->kind == cdk_reference ? "reference" : "pointer",
8595 if (declarator->kind == cdk_reference)
8597 /* In C++0x, the type we are creating a reference to might be
8598 a typedef which is itself a reference type. In that case,
8599 we follow the reference collapsing rules in
8600 [7.1.3/8 dcl.typedef] to create the final reference type:
8602 "If a typedef TD names a type that is a reference to a type
8603 T, an attempt to create the type 'lvalue reference to cv TD'
8604 creates the type 'lvalue reference to T,' while an attempt
8605 to create the type "rvalue reference to cv TD' creates the
8608 if (!VOID_TYPE_P (type))
8609 type = cp_build_reference_type
8610 ((TREE_CODE (type) == REFERENCE_TYPE
8611 ? TREE_TYPE (type) : type),
8612 (declarator->u.reference.rvalue_ref
8613 && (TREE_CODE(type) != REFERENCE_TYPE
8614 || TYPE_REF_IS_RVALUE (type))));
8616 /* In C++0x, we need this check for direct reference to
8617 reference declarations, which are forbidden by
8618 [8.3.2/5 dcl.ref]. Reference to reference declarations
8619 are only allowed indirectly through typedefs and template
8620 type arguments. Example:
8622 void foo(int & &); // invalid ref-to-ref decl
8624 typedef int & int_ref;
8625 void foo(int_ref &); // valid ref-to-ref decl
8627 if (inner_declarator && inner_declarator->kind == cdk_reference)
8628 error ("cannot declare reference to %q#T, which is not "
8629 "a typedef or a template type argument", type);
8631 else if (TREE_CODE (type) == METHOD_TYPE)
8632 type = build_ptrmemfunc_type (build_pointer_type (type));
8633 else if (declarator->kind == cdk_ptrmem)
8635 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8637 if (declarator->u.pointer.class_type == error_mark_node)
8638 /* We will already have complained. */
8639 type = error_mark_node;
8641 type = build_ptrmem_type (declarator->u.pointer.class_type,
8645 type = build_pointer_type (type);
8647 /* Process a list of type modifier keywords (such as
8648 const or volatile) that were given inside the `*' or `&'. */
8650 if (declarator->u.pointer.qualifiers)
8653 = cp_build_qualified_type (type,
8654 declarator->u.pointer.qualifiers);
8655 type_quals = cp_type_quals (type);
8668 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8669 && TREE_CODE (type) != FUNCTION_TYPE
8670 && TREE_CODE (type) != METHOD_TYPE)
8672 error ("template-id %qD used as a declarator",
8674 unqualified_id = dname;
8677 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8678 qualified with a class-name, turn it into a METHOD_TYPE, unless
8679 we know that the function is static. We take advantage of this
8680 opportunity to do other processing that pertains to entities
8681 explicitly declared to be class members. Note that if DECLARATOR
8682 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8683 would not have exited the loop above. */
8685 && declarator->u.id.qualifying_scope
8686 && TYPE_P (declarator->u.id.qualifying_scope))
8690 ctype = declarator->u.id.qualifying_scope;
8691 ctype = TYPE_MAIN_VARIANT (ctype);
8693 while (t != NULL_TREE && CLASS_TYPE_P (t))
8695 /* You're supposed to have one `template <...>' for every
8696 template class, but you don't need one for a full
8697 specialization. For example:
8699 template <class T> struct S{};
8700 template <> struct S<int> { void f(); };
8701 void S<int>::f () {}
8703 is correct; there shouldn't be a `template <>' for the
8704 definition of `S<int>::f'. */
8705 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8706 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8707 /* T is an explicit (not partial) specialization. All
8708 containing classes must therefore also be explicitly
8711 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8712 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8713 template_count += 1;
8715 t = TYPE_MAIN_DECL (t);
8716 t = DECL_CONTEXT (t);
8719 if (ctype == current_class_type)
8723 permerror (input_location, "member functions are implicitly friends of their class");
8727 permerror (declarator->id_loc,
8728 "extra qualification %<%T::%> on member %qs",
8731 else if (/* If the qualifying type is already complete, then we
8732 can skip the following checks. */
8733 !COMPLETE_TYPE_P (ctype)
8734 && (/* If the function is being defined, then
8735 qualifying type must certainly be complete. */
8737 /* A friend declaration of "T::f" is OK, even if
8738 "T" is a template parameter. But, if this
8739 function is not a friend, the qualifying type
8741 || (!friendp && !CLASS_TYPE_P (ctype))
8742 /* For a declaration, the type need not be
8743 complete, if either it is dependent (since there
8744 is no meaningful definition of complete in that
8745 case) or the qualifying class is currently being
8747 || !(dependent_type_p (ctype)
8748 || currently_open_class (ctype)))
8749 /* Check that the qualifying type is complete. */
8750 && !complete_type_or_else (ctype, NULL_TREE))
8751 return error_mark_node;
8752 else if (TREE_CODE (type) == FUNCTION_TYPE)
8754 tree sname = declarator->u.id.unqualified_name;
8756 if (current_class_type
8757 && (!friendp || funcdef_flag))
8760 ? "cannot define member function %<%T::%s%> within %<%T%>"
8761 : "cannot declare member function %<%T::%s%> within %<%T%>",
8762 ctype, name, current_class_type);
8763 return error_mark_node;
8766 /* It is not permitted to define a member function outside ist
8767 membership class as `constexpr'. */
8769 error ("a constexpr function cannot be defined "
8770 "outside of its class.");
8772 if (TREE_CODE (sname) == IDENTIFIER_NODE
8773 && NEW_DELETE_OPNAME_P (sname))
8774 /* Overloaded operator new and operator delete
8775 are always static functions. */
8778 type = build_memfn_type (type, ctype, memfn_quals);
8780 else if (declspecs->specs[(int)ds_typedef]
8781 && current_class_type)
8783 error ("cannot declare member %<%T::%s%> within %qT",
8784 ctype, name, current_class_type);
8785 return error_mark_node;
8789 /* Now TYPE has the actual type. */
8794 *attrlist = chainon (returned_attrs, *attrlist);
8796 attrlist = &returned_attrs;
8799 /* Handle parameter packs. */
8800 if (parameter_pack_p)
8802 if (decl_context == PARM)
8803 /* Turn the type into a pack expansion.*/
8804 type = make_pack_expansion (type);
8806 error ("non-parameter %qs cannot be a parameter pack", name);
8809 /* Did array size calculations overflow? */
8811 if (TREE_CODE (type) == ARRAY_TYPE
8812 && COMPLETE_TYPE_P (type)
8813 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8814 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8816 error ("size of array %qs is too large", name);
8817 /* If we proceed with the array type as it is, we'll eventually
8818 crash in tree_low_cst(). */
8819 type = error_mark_node;
8822 if ((decl_context == FIELD || decl_context == PARM)
8823 && !processing_template_decl
8824 && variably_modified_type_p (type, NULL_TREE))
8826 if (decl_context == FIELD)
8827 error ("data member may not have variably modified type %qT", type);
8829 error ("parameter may not have variably modified type %qT", type);
8830 type = error_mark_node;
8833 if (explicitp == 1 || (explicitp && friendp))
8835 /* [dcl.fct.spec] The explicit specifier shall only be used in
8836 declarations of constructors within a class definition. */
8837 error ("only declarations of constructors can be %<explicit%>");
8841 if (storage_class == sc_mutable)
8843 if (decl_context != FIELD || friendp)
8845 error ("non-member %qs cannot be declared %<mutable%>", name);
8846 storage_class = sc_none;
8848 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8850 error ("non-object member %qs cannot be declared %<mutable%>", name);
8851 storage_class = sc_none;
8853 else if (TREE_CODE (type) == FUNCTION_TYPE
8854 || TREE_CODE (type) == METHOD_TYPE)
8856 error ("function %qs cannot be declared %<mutable%>", name);
8857 storage_class = sc_none;
8861 error ("static %qs cannot be declared %<mutable%>", name);
8862 storage_class = sc_none;
8864 else if (type_quals & TYPE_QUAL_CONST)
8866 error ("const %qs cannot be declared %<mutable%>", name);
8867 storage_class = sc_none;
8871 /* If this is declaring a typedef name, return a TYPE_DECL. */
8872 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8876 /* Note that the grammar rejects storage classes
8877 in typenames, fields or parameters. */
8878 if (current_lang_name == lang_name_java)
8879 TYPE_FOR_JAVA (type) = 1;
8881 /* This declaration:
8883 typedef void f(int) const;
8885 declares a function type which is not a member of any
8886 particular class, but which is cv-qualified; for
8887 example "f S::*" declares a pointer to a const-qualified
8888 member function of S. We record the cv-qualification in the
8890 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8892 type = cp_build_qualified_type (type, memfn_quals);
8894 /* We have now dealt with these qualifiers. */
8895 memfn_quals = TYPE_UNQUALIFIED;
8898 if (decl_context == FIELD)
8899 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8901 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
8902 if (id_declarator && declarator->u.id.qualifying_scope) {
8903 error_at (DECL_SOURCE_LOCATION (decl),
8904 "typedef name may not be a nested-name-specifier");
8905 TREE_TYPE (decl) = error_mark_node;
8908 if (decl_context != FIELD)
8910 if (!current_function_decl)
8911 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8912 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8913 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8914 (current_function_decl)))
8915 /* The TYPE_DECL is "abstract" because there will be
8916 clones of this constructor/destructor, and there will
8917 be copies of this TYPE_DECL generated in those
8919 DECL_ABSTRACT (decl) = 1;
8921 else if (constructor_name_p (unqualified_id, current_class_type))
8922 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8923 "as enclosing class",
8926 /* If the user declares "typedef struct {...} foo" then the
8927 struct will have an anonymous name. Fill that name in now.
8928 Nothing can refer to it, so nothing needs know about the name
8930 if (type != error_mark_node
8933 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8934 && TYPE_ANONYMOUS_P (type)
8935 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8939 /* Replace the anonymous name with the real name everywhere. */
8940 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8942 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
8944 debug_hooks->set_name (t, decl);
8945 TYPE_NAME (t) = decl;
8949 if (TYPE_LANG_SPECIFIC (type))
8950 TYPE_WAS_ANONYMOUS (type) = 1;
8952 /* If this is a typedef within a template class, the nested
8953 type is a (non-primary) template. The name for the
8954 template needs updating as well. */
8955 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8956 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8957 = TYPE_IDENTIFIER (type);
8959 /* Adjust linkage now that we aren't anonymous anymore. */
8960 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
8961 determine_visibility (TYPE_MAIN_DECL (type));
8963 /* FIXME remangle member functions; member functions of a
8964 type with external linkage have external linkage. */
8968 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8969 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8971 bad_specifiers (decl, "type", virtualp,
8972 memfn_quals != TYPE_UNQUALIFIED,
8973 inlinep, friendp, raises != NULL_TREE);
8978 /* Detect the case of an array type of unspecified size
8979 which came, as such, direct from a typedef name.
8980 We must copy the type, so that the array's domain can be
8981 individually set by the object's initializer. */
8983 if (type && typedef_type
8984 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8985 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8986 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8988 /* Detect where we're using a typedef of function type to declare a
8989 function. PARMS will not be set, so we must create it now. */
8991 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8993 tree decls = NULL_TREE;
8996 for (args = TYPE_ARG_TYPES (type);
8997 args && args != void_list_node;
8998 args = TREE_CHAIN (args))
9000 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9002 TREE_CHAIN (decl) = decls;
9006 parms = nreverse (decls);
9008 if (decl_context != TYPENAME)
9010 /* A cv-qualifier-seq shall only be part of the function type
9011 for a non-static member function. [8.3.5/4 dcl.fct] */
9012 if (cp_type_quals (type) != TYPE_UNQUALIFIED
9013 && (current_class_type == NULL_TREE || staticp) )
9016 ? G_("qualified function types cannot be used to "
9017 "declare static member functions")
9018 : G_("qualified function types cannot be used to "
9019 "declare free functions"));
9020 type = TYPE_MAIN_VARIANT (type);
9023 /* The qualifiers on the function type become the qualifiers on
9024 the non-static member function. */
9025 memfn_quals |= cp_type_quals (type);
9029 /* If this is a type name (such as, in a cast or sizeof),
9030 compute the type and return it now. */
9032 if (decl_context == TYPENAME)
9034 /* Note that the grammar rejects storage classes
9035 in typenames, fields or parameters. */
9036 if (type_quals != TYPE_UNQUALIFIED)
9037 type_quals = TYPE_UNQUALIFIED;
9039 /* Special case: "friend class foo" looks like a TYPENAME context. */
9042 if (type_quals != TYPE_UNQUALIFIED)
9044 error ("type qualifiers specified for friend class declaration");
9045 type_quals = TYPE_UNQUALIFIED;
9049 error ("%<inline%> specified for friend class declaration");
9055 /* Don't allow friend declaration without a class-key. */
9056 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9057 permerror (input_location, "template parameters cannot be friends");
9058 else if (TREE_CODE (type) == TYPENAME_TYPE)
9059 permerror (input_location, "friend declaration requires class-key, "
9060 "i.e. %<friend class %T::%D%>",
9061 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9063 permerror (input_location, "friend declaration requires class-key, "
9064 "i.e. %<friend %#T%>",
9068 /* Only try to do this stuff if we didn't already give up. */
9069 if (type != integer_type_node)
9071 /* A friendly class? */
9072 if (current_class_type)
9073 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9076 error ("trying to make class %qT a friend of global scope",
9079 type = void_type_node;
9082 else if (memfn_quals)
9084 if (ctype == NULL_TREE
9085 && TREE_CODE (type) == METHOD_TYPE)
9086 ctype = TYPE_METHOD_BASETYPE (type);
9089 type = build_memfn_type (type, ctype, memfn_quals);
9090 /* Core issue #547: need to allow this in template type args. */
9091 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9092 type = cp_build_qualified_type (type, memfn_quals);
9094 error ("invalid qualifiers on non-member function type");
9099 else if (unqualified_id == NULL_TREE && decl_context != PARM
9100 && decl_context != CATCHPARM
9101 && TREE_CODE (type) != UNION_TYPE
9104 error ("abstract declarator %qT used as declaration", type);
9105 return error_mark_node;
9108 /* Only functions may be declared using an operator-function-id. */
9110 && IDENTIFIER_OPNAME_P (unqualified_id)
9111 && TREE_CODE (type) != FUNCTION_TYPE
9112 && TREE_CODE (type) != METHOD_TYPE)
9114 error ("declaration of %qD as non-function", unqualified_id);
9115 return error_mark_node;
9118 /* We don't check parameter types here because we can emit a better
9119 error message later. */
9120 if (decl_context != PARM)
9122 type = check_var_type (unqualified_id, type);
9123 if (type == error_mark_node)
9124 return error_mark_node;
9127 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9128 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9130 if (decl_context == PARM || decl_context == CATCHPARM)
9132 if (ctype || in_namespace)
9133 error ("cannot use %<::%> in parameter declaration");
9135 /* A parameter declared as an array of T is really a pointer to T.
9136 One declared as a function is really a pointer to a function.
9137 One declared as a member is really a pointer to member. */
9139 if (TREE_CODE (type) == ARRAY_TYPE)
9141 /* Transfer const-ness of array into that of type pointed to. */
9142 type = build_pointer_type (TREE_TYPE (type));
9143 type_quals = TYPE_UNQUALIFIED;
9145 else if (TREE_CODE (type) == FUNCTION_TYPE)
9146 type = build_pointer_type (type);
9152 if (decl_context == PARM)
9154 decl = cp_build_parm_decl (unqualified_id, type);
9156 bad_specifiers (decl, "parameter", virtualp,
9157 memfn_quals != TYPE_UNQUALIFIED,
9158 inlinep, friendp, raises != NULL_TREE);
9160 else if (decl_context == FIELD)
9162 /* The C99 flexible array extension. */
9163 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9164 && TYPE_DOMAIN (type) == NULL_TREE)
9166 tree itype = compute_array_index_type (dname, integer_zero_node);
9167 type = build_cplus_array_type (TREE_TYPE (type), itype);
9170 if (type == error_mark_node)
9172 /* Happens when declaring arrays of sizes which
9173 are error_mark_node, for example. */
9176 else if (in_namespace && !friendp)
9178 /* Something like struct S { int N::j; }; */
9179 error ("invalid use of %<::%>");
9180 return error_mark_node;
9182 else if (TREE_CODE (type) == FUNCTION_TYPE)
9185 tree function_context;
9189 if (ctype == NULL_TREE)
9190 ctype = current_class_type;
9192 if (ctype == NULL_TREE)
9194 error ("can't make %qD into a method -- not in a class",
9196 return error_mark_node;
9199 /* ``A union may [ ... ] not [ have ] virtual functions.''
9201 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9203 error ("function %qD declared virtual inside a union",
9205 return error_mark_node;
9208 if (NEW_DELETE_OPNAME_P (unqualified_id))
9212 error ("%qD cannot be declared virtual, since it "
9218 else if (staticp < 2)
9219 type = build_memfn_type (type, ctype, memfn_quals);
9222 /* Check that the name used for a destructor makes sense. */
9223 if (sfk == sfk_destructor)
9225 tree uqname = id_declarator->u.id.unqualified_name;
9229 gcc_assert (friendp);
9230 error ("expected qualified name in friend declaration "
9231 "for destructor %qD", uqname);
9232 return error_mark_node;
9235 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9237 error ("declaration of %qD as member of %qT",
9239 return error_mark_node;
9242 error ("a destructor cannot be %<constexpr%>");
9244 else if (sfk == sfk_constructor && friendp)
9246 error ("expected qualified name in friend declaration "
9247 "for constructor %qD",
9248 id_declarator->u.id.unqualified_name);
9249 return error_mark_node;
9252 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9253 function_context = (ctype != NULL_TREE) ?
9254 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9255 publicp = (! friendp || ! staticp)
9256 && function_context == NULL_TREE;
9257 decl = grokfndecl (ctype, type,
9258 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9259 ? unqualified_id : dname,
9262 virtualp, flags, memfn_quals, raises,
9263 friendp ? -1 : 0, friendp, publicp,
9264 inlinep || constexpr_p,
9266 funcdef_flag, template_count, in_namespace,
9267 attrlist, declarator->id_loc);
9268 if (decl == NULL_TREE)
9269 return error_mark_node;
9271 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9272 /* The decl and setting of decl_attr is also turned off. */
9273 decl = build_decl_attribute_variant (decl, decl_attr);
9276 /* [class.conv.ctor]
9278 A constructor declared without the function-specifier
9279 explicit that can be called with a single parameter
9280 specifies a conversion from the type of its first
9281 parameter to the type of its class. Such a constructor
9282 is called a converting constructor. */
9284 DECL_NONCONVERTING_P (decl) = 1;
9286 else if (TREE_CODE (type) == METHOD_TYPE)
9288 /* We only get here for friend declarations of
9289 members of other classes. */
9290 /* All method decls are public, so tell grokfndecl to set
9291 TREE_PUBLIC, also. */
9292 decl = grokfndecl (ctype, type,
9293 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9294 ? unqualified_id : dname,
9297 virtualp, flags, memfn_quals, raises,
9298 friendp ? -1 : 0, friendp, 1, 0, sfk,
9299 funcdef_flag, template_count, in_namespace,
9301 declarator->id_loc);
9302 if (decl == NULL_TREE)
9303 return error_mark_node;
9305 else if (!staticp && !dependent_type_p (type)
9306 && !COMPLETE_TYPE_P (complete_type (type))
9307 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9310 error ("field %qD has incomplete type", unqualified_id);
9312 error ("name %qT has incomplete type", type);
9314 /* If we're instantiating a template, tell them which
9315 instantiation made the field's type be incomplete. */
9316 if (current_class_type
9317 && TYPE_NAME (current_class_type)
9318 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9320 && declspecs->type == type)
9321 error (" in instantiation of template %qT",
9322 current_class_type);
9324 return error_mark_node;
9330 error ("%qE is neither function nor member function; "
9331 "cannot be declared friend", unqualified_id);
9339 /* Friends are treated specially. */
9340 if (ctype == current_class_type)
9341 ; /* We already issued a permerror. */
9342 else if (decl && DECL_NAME (decl))
9344 if (template_class_depth (current_class_type) == 0)
9346 decl = check_explicit_specialization
9347 (unqualified_id, decl, template_count,
9348 2 * funcdef_flag + 4);
9349 if (decl == error_mark_node)
9350 return error_mark_node;
9353 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9354 decl = do_friend (ctype, unqualified_id, decl,
9360 return error_mark_node;
9363 /* Structure field. It may not be a function, except for C++. */
9365 if (decl == NULL_TREE)
9371 /* An attempt is being made to initialize a non-static
9372 member. But, from [class.mem]:
9374 4 A member-declarator can contain a
9375 constant-initializer only if it declares a static
9376 member (_class.static_) of integral or enumeration
9377 type, see _class.static.data_.
9379 This used to be relatively common practice, but
9380 the rest of the compiler does not correctly
9381 handle the initialization unless the member is
9382 static so we make it static below. */
9383 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9385 permerror (input_location, "making %qD static", unqualified_id);
9389 if (uses_template_parms (type))
9390 /* We'll check at instantiation time. */
9392 else if (check_static_variable_definition (unqualified_id,
9394 /* If we just return the declaration, crashes
9395 will sometimes occur. We therefore return
9396 void_type_node, as if this was a friend
9397 declaration, to cause callers to completely
9398 ignore this declaration. */
9399 return error_mark_node;
9404 /* C++ allows static class members. All other work
9405 for this is done by grokfield. */
9406 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9407 set_linkage_for_static_data_member (decl);
9408 /* Even if there is an in-class initialization, DECL
9409 is considered undefined until an out-of-class
9410 definition is provided. */
9411 DECL_EXTERNAL (decl) = 1;
9414 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9419 error ("non-static data member %qE declared %<constexpr%>",
9421 decl = build_decl (input_location,
9422 FIELD_DECL, unqualified_id, type);
9423 DECL_NONADDRESSABLE_P (decl) = bitfield;
9424 if (bitfield && !unqualified_id)
9425 TREE_NO_WARNING (decl) = 1;
9427 if (storage_class == sc_mutable)
9429 DECL_MUTABLE_P (decl) = 1;
9430 storage_class = sc_none;
9434 bad_specifiers (decl, "field", virtualp,
9435 memfn_quals != TYPE_UNQUALIFIED,
9436 inlinep, friendp, raises != NULL_TREE);
9439 else if (TREE_CODE (type) == FUNCTION_TYPE
9440 || TREE_CODE (type) == METHOD_TYPE)
9445 if (!unqualified_id)
9446 return error_mark_node;
9448 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9449 original_name = dname;
9451 original_name = unqualified_id;
9453 if (storage_class == sc_auto)
9454 error ("storage class %<auto%> invalid for function %qs", name);
9455 else if (storage_class == sc_register)
9456 error ("storage class %<register%> invalid for function %qs", name);
9458 error ("storage class %<__thread%> invalid for function %qs", name);
9460 /* Function declaration not at top level.
9461 Storage classes other than `extern' are not allowed
9462 and `extern' makes no difference. */
9463 if (! toplevel_bindings_p ()
9464 && (storage_class == sc_static
9465 || declspecs->specs[(int)ds_inline])
9468 if (storage_class == sc_static)
9469 pedwarn (input_location, OPT_pedantic,
9470 "%<static%> specified invalid for function %qs "
9471 "declared out of global scope", name);
9473 pedwarn (input_location, OPT_pedantic,
9474 "%<inline%> specifier invalid for function %qs "
9475 "declared out of global scope", name);
9478 if (ctype != NULL_TREE
9479 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9481 error ("%q#T is not a class or a namespace", ctype);
9485 if (ctype == NULL_TREE)
9489 error ("virtual non-class function %qs", name);
9492 else if (sfk == sfk_constructor
9493 || sfk == sfk_destructor)
9496 ? "%qs defined in a non-class scope"
9497 : "%qs declared in a non-class scope", name);
9501 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9502 && !NEW_DELETE_OPNAME_P (original_name))
9503 type = build_method_type_directly (ctype,
9505 TYPE_ARG_TYPES (type));
9507 /* Record presence of `static'. */
9508 publicp = (ctype != NULL_TREE
9509 || storage_class == sc_extern
9510 || storage_class != sc_static);
9512 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9513 virtualp, flags, memfn_quals, raises,
9515 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9516 template_count, in_namespace, attrlist,
9517 declarator->id_loc);
9518 if (decl == NULL_TREE)
9519 return error_mark_node;
9523 int invalid_static = 0;
9525 /* Don't allow a static member function in a class, and forbid
9526 declaring main to be static. */
9527 if (TREE_CODE (type) == METHOD_TYPE)
9529 permerror (input_location, "cannot declare member function %qD to have "
9530 "static linkage", decl);
9533 else if (current_function_decl)
9535 /* FIXME need arm citation */
9536 error ("cannot declare static function inside another function");
9543 storage_class = sc_none;
9549 /* It's a variable. */
9551 /* An uninitialized decl with `extern' is a reference. */
9552 decl = grokvardecl (type, unqualified_id,
9555 (type_quals & TYPE_QUAL_CONST) != 0,
9556 ctype ? ctype : in_namespace);
9557 bad_specifiers (decl, "variable", virtualp,
9558 memfn_quals != TYPE_UNQUALIFIED,
9559 inlinep, friendp, raises != NULL_TREE);
9563 DECL_CONTEXT (decl) = ctype;
9566 permerror (input_location, "%<static%> may not be used when defining "
9567 "(as opposed to declaring) a static data member");
9569 storage_class = sc_none;
9571 if (storage_class == sc_register && TREE_STATIC (decl))
9573 error ("static member %qD declared %<register%>", decl);
9574 storage_class = sc_none;
9576 if (storage_class == sc_extern && pedantic)
9578 pedwarn (input_location, OPT_pedantic,
9579 "cannot explicitly declare member %q#D to have "
9580 "extern linkage", decl);
9581 storage_class = sc_none;
9586 if (storage_class == sc_extern && initialized && !funcdef_flag)
9588 if (toplevel_bindings_p ())
9590 /* It's common practice (and completely valid) to have a const
9591 be initialized and declared extern. */
9592 if (!(type_quals & TYPE_QUAL_CONST))
9593 warning (0, "%qs initialized and declared %<extern%>", name);
9597 error ("%qs has both %<extern%> and initializer", name);
9598 return error_mark_node;
9602 /* Record `register' declaration for warnings on &
9603 and in case doing stupid register allocation. */
9605 if (storage_class == sc_register)
9606 DECL_REGISTER (decl) = 1;
9607 else if (storage_class == sc_extern)
9608 DECL_THIS_EXTERN (decl) = 1;
9609 else if (storage_class == sc_static)
9610 DECL_THIS_STATIC (decl) = 1;
9612 /* Don't forget constexprness. */
9613 if (VAR_OR_FUNCTION_DECL_P (decl))
9614 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9616 /* Record constancy and volatility on the DECL itself . There's
9617 no need to do this when processing a template; we'll do this
9618 for the instantiated declaration based on the type of DECL. */
9619 if (!processing_template_decl)
9620 cp_apply_type_quals_to_decl (type_quals, decl);
9626 /* Subroutine of start_function. Ensure that each of the parameter
9627 types (as listed in PARMS) is complete, as is required for a
9628 function definition. */
9631 require_complete_types_for_parms (tree parms)
9633 for (; parms; parms = TREE_CHAIN (parms))
9635 if (dependent_type_p (TREE_TYPE (parms)))
9637 if (!VOID_TYPE_P (TREE_TYPE (parms))
9638 && complete_type_or_else (TREE_TYPE (parms), parms))
9640 relayout_decl (parms);
9641 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9644 /* grokparms or complete_type_or_else will have already issued
9646 TREE_TYPE (parms) = error_mark_node;
9650 /* Returns nonzero if T is a local variable. */
9653 local_variable_p (const_tree t)
9655 if ((TREE_CODE (t) == VAR_DECL
9656 /* A VAR_DECL with a context that is a _TYPE is a static data
9658 && !TYPE_P (CP_DECL_CONTEXT (t))
9659 /* Any other non-local variable must be at namespace scope. */
9660 && !DECL_NAMESPACE_SCOPE_P (t))
9661 || (TREE_CODE (t) == PARM_DECL))
9667 /* Like local_variable_p, but suitable for use as a tree-walking
9671 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9672 void *data ATTRIBUTE_UNUSED)
9674 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9676 else if (TYPE_P (*tp))
9683 /* Check that ARG, which is a default-argument expression for a
9684 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9685 something goes wrong. DECL may also be a _TYPE node, rather than a
9686 DECL, if there is no DECL available. */
9689 check_default_argument (tree decl, tree arg)
9694 if (TREE_CODE (arg) == DEFAULT_ARG)
9695 /* We get a DEFAULT_ARG when looking at an in-class declaration
9696 with a default argument. Ignore the argument for now; we'll
9697 deal with it after the class is complete. */
9706 decl_type = TREE_TYPE (decl);
9708 if (arg == error_mark_node
9709 || decl == error_mark_node
9710 || TREE_TYPE (arg) == error_mark_node
9711 || decl_type == error_mark_node)
9712 /* Something already went wrong. There's no need to check
9714 return error_mark_node;
9716 /* [dcl.fct.default]
9718 A default argument expression is implicitly converted to the
9720 if (!TREE_TYPE (arg)
9721 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9724 error ("default argument for %q#D has type %qT",
9725 decl, TREE_TYPE (arg));
9727 error ("default argument for parameter of type %qT has type %qT",
9728 decl_type, TREE_TYPE (arg));
9730 return error_mark_node;
9733 /* [dcl.fct.default]
9735 Local variables shall not be used in default argument
9738 The keyword `this' shall not be used in a default argument of a
9740 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9743 error ("default argument %qE uses local variable %qD", arg, var);
9744 return error_mark_node;
9751 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9754 type_is_deprecated (tree type)
9756 enum tree_code code;
9757 if (TREE_DEPRECATED (type))
9759 if (TYPE_NAME (type)
9760 && TREE_DEPRECATED (TYPE_NAME (type)))
9763 code = TREE_CODE (type);
9765 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9766 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9767 || code == METHOD_TYPE || code == ARRAY_TYPE)
9768 return type_is_deprecated (TREE_TYPE (type));
9770 if (TYPE_PTRMEMFUNC_P (type))
9771 return type_is_deprecated
9772 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9777 /* Decode the list of parameter types for a function type.
9778 Given the list of things declared inside the parens,
9779 return a list of types.
9781 If this parameter does not end with an ellipsis, we append
9784 *PARMS is set to the chain of PARM_DECLs created. */
9787 grokparms (tree parmlist, tree *parms)
9789 tree result = NULL_TREE;
9790 tree decls = NULL_TREE;
9794 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9796 tree type = NULL_TREE;
9797 tree init = TREE_PURPOSE (parm);
9798 tree decl = TREE_VALUE (parm);
9801 if (parm == void_list_node)
9804 if (! decl || TREE_TYPE (decl) == error_mark_node)
9807 type = TREE_TYPE (decl);
9808 if (VOID_TYPE_P (type))
9810 if (same_type_p (type, void_type_node)
9811 && DECL_SELF_REFERENCE_P (type)
9812 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9813 /* this is a parmlist of `(void)', which is ok. */
9815 cxx_incomplete_type_error (decl, type);
9816 /* It's not a good idea to actually create parameters of
9817 type `void'; other parts of the compiler assume that a
9818 void type terminates the parameter list. */
9819 type = error_mark_node;
9820 TREE_TYPE (decl) = error_mark_node;
9823 if (type != error_mark_node
9824 && TYPE_FOR_JAVA (type)
9825 && MAYBE_CLASS_TYPE_P (type))
9827 error ("parameter %qD has Java class type", decl);
9828 type = error_mark_node;
9829 TREE_TYPE (decl) = error_mark_node;
9833 if (type != error_mark_node
9834 && (errmsg = targetm.invalid_parameter_type (type)))
9837 type = error_mark_node;
9838 TREE_TYPE (decl) = error_mark_node;
9841 if (type != error_mark_node)
9843 if (deprecated_state != DEPRECATED_SUPPRESS)
9845 tree deptype = type_is_deprecated (type);
9847 warn_deprecated_use (deptype, NULL_TREE);
9850 /* Top-level qualifiers on the parameters are
9851 ignored for function types. */
9852 type = cp_build_qualified_type (type, 0);
9853 if (TREE_CODE (type) == METHOD_TYPE)
9855 error ("parameter %qD invalidly declared method type", decl);
9856 type = build_pointer_type (type);
9857 TREE_TYPE (decl) = type;
9859 else if (abstract_virtuals_error (decl, type))
9860 any_error = 1; /* Seems like a good idea. */
9861 else if (POINTER_TYPE_P (type))
9863 /* [dcl.fct]/6, parameter types cannot contain pointers
9864 (references) to arrays of unknown bound. */
9865 tree t = TREE_TYPE (type);
9866 int ptr = TYPE_PTR_P (type);
9872 else if (TREE_CODE (t) != ARRAY_TYPE)
9874 else if (!TYPE_DOMAIN (t))
9878 if (TREE_CODE (t) == ARRAY_TYPE)
9879 error ("parameter %qD includes %s to array of unknown "
9881 decl, ptr ? "pointer" : "reference", t);
9886 else if (init && !processing_template_decl)
9887 init = check_default_argument (decl, init);
9890 if (TREE_CODE (decl) == PARM_DECL
9891 && FUNCTION_PARAMETER_PACK_P (decl)
9892 && TREE_CHAIN (parm)
9893 && TREE_CHAIN (parm) != void_list_node)
9894 error ("parameter packs must be at the end of the parameter list");
9896 TREE_CHAIN (decl) = decls;
9898 result = tree_cons (init, type, result);
9900 decls = nreverse (decls);
9901 result = nreverse (result);
9903 result = chainon (result, void_list_node);
9910 /* D is a constructor or overloaded `operator='.
9912 Let T be the class in which D is declared. Then, this function
9915 -1 if D's is an ill-formed constructor or copy assignment operator
9916 whose first parameter is of type `T'.
9917 0 if D is not a copy constructor or copy assignment
9919 1 if D is a copy constructor or copy assignment operator whose
9920 first parameter is a reference to non-const qualified T.
9921 2 if D is a copy constructor or copy assignment operator whose
9922 first parameter is a reference to const qualified T.
9924 This function can be used as a predicate. Positive values indicate
9925 a copy constructor and nonzero values indicate a copy assignment
9929 copy_fn_p (const_tree d)
9935 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9937 if (TREE_CODE (d) == TEMPLATE_DECL
9938 || (DECL_TEMPLATE_INFO (d)
9939 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9940 /* Instantiations of template member functions are never copy
9941 functions. Note that member functions of templated classes are
9942 represented as template functions internally, and we must
9943 accept those as copy functions. */
9946 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9950 arg_type = TREE_VALUE (args);
9951 if (arg_type == error_mark_node)
9954 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9956 /* Pass by value copy assignment operator. */
9959 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9960 && !TYPE_REF_IS_RVALUE (arg_type)
9961 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9963 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9969 args = TREE_CHAIN (args);
9971 if (args && args != void_list_node && !TREE_PURPOSE (args))
9972 /* There are more non-optional args. */
9978 /* D is a constructor or overloaded `operator='.
9980 Let T be the class in which D is declared. Then, this function
9981 returns true when D is a move constructor or move assignment
9982 operator, false otherwise. */
9985 move_fn_p (const_tree d)
9989 bool result = false;
9991 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9993 if (cxx_dialect == cxx98)
9994 /* There are no move constructors if we are in C++98 mode. */
9997 if (TREE_CODE (d) == TEMPLATE_DECL
9998 || (DECL_TEMPLATE_INFO (d)
9999 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10000 /* Instantiations of template member functions are never copy
10001 functions. Note that member functions of templated classes are
10002 represented as template functions internally, and we must
10003 accept those as copy functions. */
10006 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10010 arg_type = TREE_VALUE (args);
10011 if (arg_type == error_mark_node)
10014 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10015 && TYPE_REF_IS_RVALUE (arg_type)
10016 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10020 args = TREE_CHAIN (args);
10022 if (args && args != void_list_node && !TREE_PURPOSE (args))
10023 /* There are more non-optional args. */
10029 /* Remember any special properties of member function DECL. */
10032 grok_special_member_properties (tree decl)
10036 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10039 class_type = DECL_CONTEXT (decl);
10040 if (DECL_CONSTRUCTOR_P (decl))
10042 int ctor = copy_fn_p (decl);
10044 if (!DECL_ARTIFICIAL (decl))
10045 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10051 A non-template constructor for class X is a copy
10052 constructor if its first parameter is of type X&, const
10053 X&, volatile X& or const volatile X&, and either there
10054 are no other parameters or else all other parameters have
10055 default arguments. */
10056 TYPE_HAS_INIT_REF (class_type) = 1;
10057 if (user_provided_p (decl))
10058 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
10060 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
10062 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10064 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10065 if (user_provided_p (decl))
10066 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10068 else if (is_list_ctor (decl))
10069 TYPE_HAS_LIST_CTOR (class_type) = 1;
10071 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10075 A non-template assignment operator for class X is a copy
10076 assignment operator if its parameter is of type X, X&, const
10077 X&, volatile X& or const volatile X&. */
10079 int assop = copy_fn_p (decl);
10083 TYPE_HAS_ASSIGN_REF (class_type) = 1;
10084 if (user_provided_p (decl))
10085 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
10087 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
10092 /* Check a constructor DECL has the correct form. Complains
10093 if the class has a constructor of the form X(X). */
10096 grok_ctor_properties (const_tree ctype, const_tree decl)
10098 int ctor_parm = copy_fn_p (decl);
10104 A declaration of a constructor for a class X is ill-formed if
10105 its first parameter is of type (optionally cv-qualified) X
10106 and either there are no other parameters or else all other
10107 parameters have default arguments.
10109 We *don't* complain about member template instantiations that
10110 have this form, though; they can occur as we try to decide
10111 what constructor to use during overload resolution. Since
10112 overload resolution will never prefer such a constructor to
10113 the non-template copy constructor (which is either explicitly
10114 or implicitly defined), there's no need to worry about their
10115 existence. Theoretically, they should never even be
10116 instantiated, but that's hard to forestall. */
10117 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10125 /* An operator with this code is unary, but can also be binary. */
10128 ambi_op_p (enum tree_code code)
10130 return (code == INDIRECT_REF
10131 || code == ADDR_EXPR
10132 || code == UNARY_PLUS_EXPR
10133 || code == NEGATE_EXPR
10134 || code == PREINCREMENT_EXPR
10135 || code == PREDECREMENT_EXPR);
10138 /* An operator with this name can only be unary. */
10141 unary_op_p (enum tree_code code)
10143 return (code == TRUTH_NOT_EXPR
10144 || code == BIT_NOT_EXPR
10145 || code == COMPONENT_REF
10146 || code == TYPE_EXPR);
10149 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10150 errors are issued for invalid declarations. */
10153 grok_op_properties (tree decl, bool complain)
10155 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10157 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10158 tree name = DECL_NAME (decl);
10159 enum tree_code operator_code;
10164 /* Count the number of arguments and check for ellipsis. */
10165 for (argtype = argtypes, arity = 0;
10166 argtype && argtype != void_list_node;
10167 argtype = TREE_CHAIN (argtype))
10169 ellipsis_p = !argtype;
10171 class_type = DECL_CONTEXT (decl);
10172 if (class_type && !CLASS_TYPE_P (class_type))
10173 class_type = NULL_TREE;
10175 if (DECL_CONV_FN_P (decl))
10176 operator_code = TYPE_EXPR;
10180 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10181 if (ansi_opname (CODE) == name) \
10183 operator_code = (CODE); \
10186 else if (ansi_assopname (CODE) == name) \
10188 operator_code = (CODE); \
10189 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10193 #include "operators.def"
10194 #undef DEF_OPERATOR
10196 gcc_unreachable ();
10199 gcc_assert (operator_code != MAX_TREE_CODES);
10200 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10203 switch (operator_code)
10206 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10210 TYPE_GETS_DELETE (class_type) |= 1;
10214 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10217 case VEC_DELETE_EXPR:
10218 TYPE_GETS_DELETE (class_type) |= 2;
10225 /* [basic.std.dynamic.allocation]/1:
10227 A program is ill-formed if an allocation function is declared
10228 in a namespace scope other than global scope or declared static
10231 The same also holds true for deallocation functions. */
10232 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10233 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10235 if (DECL_NAMESPACE_SCOPE_P (decl))
10237 if (CP_DECL_CONTEXT (decl) != global_namespace)
10239 error ("%qD may not be declared within a namespace", decl);
10242 else if (!TREE_PUBLIC (decl))
10244 error ("%qD may not be declared as static", decl);
10250 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10252 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10253 DECL_IS_OPERATOR_NEW (decl) = 1;
10255 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10256 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10259 /* An operator function must either be a non-static member function
10260 or have at least one parameter of a class, a reference to a class,
10261 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10262 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10264 if (operator_code == TYPE_EXPR
10265 || operator_code == CALL_EXPR
10266 || operator_code == COMPONENT_REF
10267 || operator_code == ARRAY_REF
10268 || operator_code == NOP_EXPR)
10270 if (class_type && LAMBDA_TYPE_P (class_type))
10271 /* Lambdas can have static op() and conv ops. */;
10274 error ("%qD must be a nonstatic member function", decl);
10282 if (DECL_STATIC_FUNCTION_P (decl))
10284 error ("%qD must be either a non-static member "
10285 "function or a non-member function", decl);
10289 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10291 tree arg = non_reference (TREE_VALUE (p));
10292 if (arg == error_mark_node)
10295 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10296 because these checks are performed even on
10297 template functions. */
10298 if (MAYBE_CLASS_TYPE_P (arg)
10299 || TREE_CODE (arg) == ENUMERAL_TYPE)
10303 if (!p || p == void_list_node)
10306 error ("%qD must have an argument of class or "
10307 "enumerated type", decl);
10313 /* There are no restrictions on the arguments to an overloaded
10315 if (operator_code == CALL_EXPR)
10318 /* Warn about conversion operators that will never be used. */
10319 if (IDENTIFIER_TYPENAME_P (name)
10320 && ! DECL_TEMPLATE_INFO (decl)
10322 /* Warn only declaring the function; there is no need to
10323 warn again about out-of-class definitions. */
10324 && class_type == current_class_type)
10326 tree t = TREE_TYPE (name);
10327 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10328 const char *what = 0;
10331 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10333 if (TREE_CODE (t) == VOID_TYPE)
10335 else if (class_type)
10337 if (t == class_type)
10338 what = "the same type";
10339 /* Don't force t to be complete here. */
10340 else if (MAYBE_CLASS_TYPE_P (t)
10341 && COMPLETE_TYPE_P (t)
10342 && DERIVED_FROM_P (t, class_type))
10343 what = "a base class";
10347 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10348 "conversion operator",
10349 ref ? "a reference to " : "", what);
10352 if (operator_code == COND_EXPR)
10355 error ("ISO C++ prohibits overloading operator ?:");
10358 else if (ellipsis_p)
10360 error ("%qD must not have variable number of arguments", decl);
10363 else if (ambi_op_p (operator_code))
10366 /* We pick the one-argument operator codes by default, so
10367 we don't have to change anything. */
10369 else if (arity == 2)
10371 /* If we thought this was a unary operator, we now know
10372 it to be a binary operator. */
10373 switch (operator_code)
10376 operator_code = MULT_EXPR;
10380 operator_code = BIT_AND_EXPR;
10383 case UNARY_PLUS_EXPR:
10384 operator_code = PLUS_EXPR;
10388 operator_code = MINUS_EXPR;
10391 case PREINCREMENT_EXPR:
10392 operator_code = POSTINCREMENT_EXPR;
10395 case PREDECREMENT_EXPR:
10396 operator_code = POSTDECREMENT_EXPR;
10400 gcc_unreachable ();
10403 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10405 if ((operator_code == POSTINCREMENT_EXPR
10406 || operator_code == POSTDECREMENT_EXPR)
10407 && ! processing_template_decl
10408 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10411 error ("postfix %qD must take %<int%> as its argument",
10414 error ("postfix %qD must take %<int%> as its second "
10422 error ("%qD must take either zero or one argument", decl);
10424 error ("%qD must take either one or two arguments", decl);
10428 /* More Effective C++ rule 6. */
10430 && (operator_code == POSTINCREMENT_EXPR
10431 || operator_code == POSTDECREMENT_EXPR
10432 || operator_code == PREINCREMENT_EXPR
10433 || operator_code == PREDECREMENT_EXPR))
10435 tree arg = TREE_VALUE (argtypes);
10436 tree ret = TREE_TYPE (TREE_TYPE (decl));
10437 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10438 arg = TREE_TYPE (arg);
10439 arg = TYPE_MAIN_VARIANT (arg);
10440 if (operator_code == PREINCREMENT_EXPR
10441 || operator_code == PREDECREMENT_EXPR)
10443 if (TREE_CODE (ret) != REFERENCE_TYPE
10444 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10446 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10447 build_reference_type (arg));
10451 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10452 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10456 else if (unary_op_p (operator_code))
10461 error ("%qD must take %<void%>", decl);
10463 error ("%qD must take exactly one argument", decl);
10467 else /* if (binary_op_p (operator_code)) */
10472 error ("%qD must take exactly one argument", decl);
10474 error ("%qD must take exactly two arguments", decl);
10478 /* More Effective C++ rule 7. */
10480 && (operator_code == TRUTH_ANDIF_EXPR
10481 || operator_code == TRUTH_ORIF_EXPR
10482 || operator_code == COMPOUND_EXPR))
10483 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10487 /* Effective C++ rule 23. */
10490 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10491 && (operator_code == PLUS_EXPR
10492 || operator_code == MINUS_EXPR
10493 || operator_code == TRUNC_DIV_EXPR
10494 || operator_code == MULT_EXPR
10495 || operator_code == TRUNC_MOD_EXPR)
10496 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10497 warning (OPT_Weffc__, "%qD should return by value", decl);
10499 /* [over.oper]/8 */
10500 for (; argtypes && argtypes != void_list_node;
10501 argtypes = TREE_CHAIN (argtypes))
10502 if (TREE_PURPOSE (argtypes))
10504 TREE_PURPOSE (argtypes) = NULL_TREE;
10505 if (operator_code == POSTINCREMENT_EXPR
10506 || operator_code == POSTDECREMENT_EXPR)
10508 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10513 error ("%qD cannot have default arguments", decl);
10521 /* Return a string giving the keyword associate with CODE. */
10523 static const char *
10524 tag_name (enum tag_types code)
10536 case typename_type:
10539 gcc_unreachable ();
10543 /* Name lookup in an elaborated-type-specifier (after the keyword
10544 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10545 elaborated-type-specifier is invalid, issue a diagnostic and return
10546 error_mark_node; otherwise, return the *_TYPE to which it referred.
10547 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10550 check_elaborated_type_specifier (enum tag_types tag_code,
10552 bool allow_template_p)
10558 struct S { struct S *p; };
10560 name lookup will find the TYPE_DECL for the implicit "S::S"
10561 typedef. Adjust for that here. */
10562 if (DECL_SELF_REFERENCE_P (decl))
10563 decl = TYPE_NAME (TREE_TYPE (decl));
10565 type = TREE_TYPE (decl);
10567 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10568 is false for this case as well. */
10569 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10571 error ("using template type parameter %qT after %qs",
10572 type, tag_name (tag_code));
10573 return error_mark_node;
10577 If the identifier resolves to a typedef-name or a template
10578 type-parameter, the elaborated-type-specifier is ill-formed.
10580 In other words, the only legitimate declaration to use in the
10581 elaborated type specifier is the implicit typedef created when
10582 the type is declared. */
10583 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10584 && tag_code != typename_type)
10586 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10587 error ("%q+D has a previous declaration here", decl);
10588 return error_mark_node;
10590 else if (TREE_CODE (type) != RECORD_TYPE
10591 && TREE_CODE (type) != UNION_TYPE
10592 && tag_code != enum_type
10593 && tag_code != typename_type)
10595 error ("%qT referred to as %qs", type, tag_name (tag_code));
10596 error ("%q+T has a previous declaration here", type);
10597 return error_mark_node;
10599 else if (TREE_CODE (type) != ENUMERAL_TYPE
10600 && tag_code == enum_type)
10602 error ("%qT referred to as enum", type);
10603 error ("%q+T has a previous declaration here", type);
10604 return error_mark_node;
10606 else if (!allow_template_p
10607 && TREE_CODE (type) == RECORD_TYPE
10608 && CLASSTYPE_IS_TEMPLATE (type))
10610 /* If a class template appears as elaborated type specifier
10611 without a template header such as:
10613 template <class T> class C {};
10614 void f(class C); // No template header here
10616 then the required template argument is missing. */
10617 error ("template argument required for %<%s %T%>",
10618 tag_name (tag_code),
10619 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10620 return error_mark_node;
10626 /* Lookup NAME in elaborate type specifier in scope according to
10627 SCOPE and issue diagnostics if necessary.
10628 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10629 found, and ERROR_MARK_NODE for type error. */
10632 lookup_and_check_tag (enum tag_types tag_code, tree name,
10633 tag_scope scope, bool template_header_p)
10637 if (scope == ts_global)
10639 /* First try ordinary name lookup, ignoring hidden class name
10640 injected via friend declaration. */
10641 decl = lookup_name_prefer_type (name, 2);
10642 /* If that fails, the name will be placed in the smallest
10643 non-class, non-function-prototype scope according to 3.3.1/5.
10644 We may already have a hidden name declared as friend in this
10645 scope. So lookup again but not ignoring hidden names.
10646 If we find one, that name will be made visible rather than
10647 creating a new tag. */
10649 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10652 decl = lookup_type_scope (name, scope);
10654 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10655 decl = DECL_TEMPLATE_RESULT (decl);
10657 if (decl && TREE_CODE (decl) == TYPE_DECL)
10659 /* Look for invalid nested type:
10663 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10665 error ("%qD has the same name as the class in which it is "
10668 return error_mark_node;
10671 /* Two cases we need to consider when deciding if a class
10672 template is allowed as an elaborated type specifier:
10673 1. It is a self reference to its own class.
10674 2. It comes with a template header.
10678 template <class T> class C {
10679 class C *c1; // DECL_SELF_REFERENCE_P is true
10682 template <class U> class C; // template_header_p is true
10683 template <class T> class C<T>::D {
10684 class C *c2; // DECL_SELF_REFERENCE_P is true
10687 t = check_elaborated_type_specifier (tag_code,
10690 | DECL_SELF_REFERENCE_P (decl));
10693 else if (decl && TREE_CODE (decl) == TREE_LIST)
10695 error ("reference to %qD is ambiguous", name);
10696 print_candidates (decl);
10697 return error_mark_node;
10703 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10704 Define the tag as a forward-reference if it is not defined.
10706 If a declaration is given, process it here, and report an error if
10707 multiple declarations are not identical.
10709 SCOPE is TS_CURRENT when this is also a definition. Only look in
10710 the current frame for the name (since C++ allows new names in any
10711 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10712 declaration. Only look beginning from the current scope outward up
10713 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10715 TEMPLATE_HEADER_P is true when this declaration is preceded by
10716 a set of template parameters. */
10719 xref_tag (enum tag_types tag_code, tree name,
10720 tag_scope scope, bool template_header_p)
10722 enum tree_code code;
10724 tree context = NULL_TREE;
10726 timevar_push (TV_NAME_LOOKUP);
10728 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10734 code = RECORD_TYPE;
10740 code = ENUMERAL_TYPE;
10743 gcc_unreachable ();
10746 /* In case of anonymous name, xref_tag is only called to
10747 make type node and push name. Name lookup is not required. */
10748 if (ANON_AGGRNAME_P (name))
10751 t = lookup_and_check_tag (tag_code, name,
10752 scope, template_header_p);
10754 if (t == error_mark_node)
10755 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10757 if (scope != ts_current && t && current_class_type
10758 && template_class_depth (current_class_type)
10759 && template_header_p)
10761 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10762 definition of this tag. Since, in addition, we are currently
10763 processing a (member) template declaration of a template
10764 class, we must be very careful; consider:
10771 { template <class V>
10772 friend struct S1; };
10774 Here, the S2::S1 declaration should not be confused with the
10775 outer declaration. In particular, the inner version should
10776 have a template parameter of level 2, not level 1. This
10777 would be particularly important if the member declaration
10780 template <class V = U> friend struct S1;
10782 say, when we should tsubst into `U' when instantiating
10783 S2. On the other hand, when presented with:
10793 we must find the inner binding eventually. We
10794 accomplish this by making sure that the new type we
10795 create to represent this declaration has the right
10797 context = TYPE_CONTEXT (t);
10803 /* If no such tag is yet defined, create a forward-reference node
10804 and record it as the "definition".
10805 When a real declaration of this type is found,
10806 the forward-reference will be altered into a real type. */
10807 if (code == ENUMERAL_TYPE)
10809 error ("use of enum %q#D without previous declaration", name);
10810 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10814 t = make_class_type (code);
10815 TYPE_CONTEXT (t) = context;
10816 t = pushtag (name, t, scope);
10821 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10823 if (!redeclare_class_template (t, current_template_parms))
10824 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10826 else if (!processing_template_decl
10827 && CLASS_TYPE_P (t)
10828 && CLASSTYPE_IS_TEMPLATE (t))
10830 error ("redeclaration of %qT as a non-template", t);
10831 error ("previous declaration %q+D", t);
10832 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10835 /* Make injected friend class visible. */
10836 if (scope != ts_within_enclosing_non_class
10837 && hidden_name_p (TYPE_NAME (t)))
10839 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10840 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10842 if (TYPE_TEMPLATE_INFO (t))
10844 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10845 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10850 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10854 xref_tag_from_type (tree old, tree id, tag_scope scope)
10856 enum tag_types tag_kind;
10858 if (TREE_CODE (old) == RECORD_TYPE)
10859 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10861 tag_kind = union_type;
10863 if (id == NULL_TREE)
10864 id = TYPE_IDENTIFIER (old);
10866 return xref_tag (tag_kind, id, scope, false);
10869 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10870 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10871 access_* node, and the TREE_VALUE is the type of the base-class.
10872 Non-NULL TREE_TYPE indicates virtual inheritance.
10874 Returns true if the binfo hierarchy was successfully created,
10875 false if an error was detected. */
10878 xref_basetypes (tree ref, tree base_list)
10881 tree binfo, base_binfo;
10882 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10883 unsigned max_bases = 0; /* Maximum direct bases. */
10885 tree default_access;
10886 tree igo_prev; /* Track Inheritance Graph Order. */
10888 if (ref == error_mark_node)
10891 /* The base of a derived class is private by default, all others are
10893 default_access = (TREE_CODE (ref) == RECORD_TYPE
10894 && CLASSTYPE_DECLARED_CLASS (ref)
10895 ? access_private_node : access_public_node);
10897 /* First, make sure that any templates in base-classes are
10898 instantiated. This ensures that if we call ourselves recursively
10899 we do not get confused about which classes are marked and which
10901 basep = &base_list;
10904 tree basetype = TREE_VALUE (*basep);
10906 if (!(processing_template_decl && uses_template_parms (basetype))
10907 && !complete_type_or_else (basetype, NULL))
10908 /* An incomplete type. Remove it from the list. */
10909 *basep = TREE_CHAIN (*basep);
10913 if (TREE_TYPE (*basep))
10915 if (CLASS_TYPE_P (basetype))
10916 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10917 basep = &TREE_CHAIN (*basep);
10921 TYPE_MARKED_P (ref) = 1;
10923 /* The binfo slot should be empty, unless this is an (ill-formed)
10925 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10926 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10928 binfo = make_tree_binfo (max_bases);
10930 TYPE_BINFO (ref) = binfo;
10931 BINFO_OFFSET (binfo) = size_zero_node;
10932 BINFO_TYPE (binfo) = ref;
10934 /* Apply base-class info set up to the variants of this type. */
10935 fixup_type_variants (ref);
10939 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10940 /* An aggregate cannot have baseclasses. */
10941 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10943 if (TREE_CODE (ref) == UNION_TYPE)
10945 error ("derived union %qT invalid", ref);
10952 if (TYPE_FOR_JAVA (ref))
10954 error ("Java class %qT cannot have multiple bases", ref);
10961 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10963 if (TYPE_FOR_JAVA (ref))
10965 error ("Java class %qT cannot have virtual bases", ref);
10970 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10972 tree access = TREE_PURPOSE (base_list);
10973 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10974 tree basetype = TREE_VALUE (base_list);
10976 if (access == access_default_node)
10977 access = default_access;
10979 if (PACK_EXPANSION_P (basetype))
10980 basetype = PACK_EXPANSION_PATTERN (basetype);
10981 if (TREE_CODE (basetype) == TYPE_DECL)
10982 basetype = TREE_TYPE (basetype);
10983 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10985 error ("base type %qT fails to be a struct or class type",
10990 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10991 TYPE_FOR_JAVA (ref) = 1;
10993 base_binfo = NULL_TREE;
10994 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10996 base_binfo = TYPE_BINFO (basetype);
10997 /* The original basetype could have been a typedef'd type. */
10998 basetype = BINFO_TYPE (base_binfo);
11000 /* Inherit flags from the base. */
11001 TYPE_HAS_NEW_OPERATOR (ref)
11002 |= TYPE_HAS_NEW_OPERATOR (basetype);
11003 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11004 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11005 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11006 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11007 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11008 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11009 CLASSTYPE_REPEATED_BASE_P (ref)
11010 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11013 /* We must do this test after we've seen through a typedef
11015 if (TYPE_MARKED_P (basetype))
11017 if (basetype == ref)
11018 error ("recursive type %qT undefined", basetype);
11020 error ("duplicate base type %qT invalid", basetype);
11024 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11025 /* Regenerate the pack expansion for the bases. */
11026 basetype = make_pack_expansion (basetype);
11028 TYPE_MARKED_P (basetype) = 1;
11030 base_binfo = copy_binfo (base_binfo, basetype, ref,
11031 &igo_prev, via_virtual);
11032 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11033 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11035 BINFO_BASE_APPEND (binfo, base_binfo);
11036 BINFO_BASE_ACCESS_APPEND (binfo, access);
11039 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11040 /* If we have space in the vbase vector, we must have shared at
11041 least one of them, and are therefore diamond shaped. */
11042 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11044 /* Unmark all the types. */
11045 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11046 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11047 TYPE_MARKED_P (ref) = 0;
11049 /* Now see if we have a repeated base type. */
11050 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11052 for (base_binfo = binfo; base_binfo;
11053 base_binfo = TREE_CHAIN (base_binfo))
11055 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11057 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11060 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11062 for (base_binfo = binfo; base_binfo;
11063 base_binfo = TREE_CHAIN (base_binfo))
11064 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11065 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11074 /* Begin compiling the definition of an enumeration type.
11077 UNDERLYING_TYPE is the type that will be used as the storage for
11078 the enumeration type. This should be NULL_TREE if no storage type
11081 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11083 Returns the type object, as yet incomplete.
11084 Also records info about it so that build_enumerator
11085 may be used to declare the individual values as they are read. */
11088 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
11092 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11094 /* If this is the real definition for a previous forward reference,
11095 fill in the contents in the same object that used to be the
11096 forward reference. */
11098 enumtype = lookup_and_check_tag (enum_type, name,
11099 /*tag_scope=*/ts_current,
11100 /*template_header_p=*/false);
11102 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11104 error_at (input_location, "multiple definition of %q#T", enumtype);
11105 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11106 "previous definition here");
11107 /* Clear out TYPE_VALUES, and start again. */
11108 TYPE_VALUES (enumtype) = NULL_TREE;
11112 /* In case of error, make a dummy enum to allow parsing to
11114 if (enumtype == error_mark_node)
11115 name = make_anon_name ();
11117 enumtype = cxx_make_type (ENUMERAL_TYPE);
11118 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11121 if (enumtype == error_mark_node)
11126 SET_SCOPED_ENUM_P (enumtype, 1);
11127 begin_scope (sk_scoped_enum, enumtype);
11129 /* [C++0x dcl.enum]p5:
11131 If not explicitly specified, the underlying type of a scoped
11132 enumeration type is int. */
11133 if (!underlying_type)
11134 underlying_type = integer_type_node;
11137 if (underlying_type)
11139 if (CP_INTEGRAL_TYPE_P (underlying_type))
11141 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11142 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11143 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11144 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11145 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11146 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11147 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11148 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11149 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11150 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11152 else if (!dependent_type_p (underlying_type))
11153 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11154 underlying_type, enumtype);
11160 /* After processing and defining all the values of an enumeration type,
11161 install their decls in the enumeration type and finish it off.
11162 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11165 finish_enum (tree enumtype)
11174 bool use_short_enum;
11179 tree underlying_type = NULL_TREE;
11180 bool fixed_underlying_type_p
11181 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11183 /* We built up the VALUES in reverse order. */
11184 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11186 /* For an enum defined in a template, just set the type of the values;
11187 all further processing is postponed until the template is
11188 instantiated. We need to set the type so that tsubst of a CONST_DECL
11190 if (processing_template_decl)
11192 for (values = TYPE_VALUES (enumtype);
11194 values = TREE_CHAIN (values))
11195 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11196 if (at_function_scope_p ())
11197 add_stmt (build_min (TAG_DEFN, enumtype));
11198 if (SCOPED_ENUM_P (enumtype))
11203 /* Determine the minimum and maximum values of the enumerators. */
11204 if (TYPE_VALUES (enumtype))
11206 minnode = maxnode = NULL_TREE;
11208 for (values = TYPE_VALUES (enumtype);
11210 values = TREE_CHAIN (values))
11212 decl = TREE_VALUE (values);
11214 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11215 each enumerator has the type of its enumeration. Prior to the
11216 closing brace, the type of each enumerator is the type of its
11217 initializing value. */
11218 TREE_TYPE (decl) = enumtype;
11220 /* Update the minimum and maximum values, if appropriate. */
11221 value = DECL_INITIAL (decl);
11222 if (value == error_mark_node)
11223 value = integer_zero_node;
11224 /* Figure out what the minimum and maximum values of the
11225 enumerators are. */
11227 minnode = maxnode = value;
11228 else if (tree_int_cst_lt (maxnode, value))
11230 else if (tree_int_cst_lt (value, minnode))
11237 If the enumerator-list is empty, the underlying type is as if
11238 the enumeration had a single enumerator with value 0. */
11239 minnode = maxnode = integer_zero_node;
11241 /* Compute the number of bits require to represent all values of the
11242 enumeration. We must do this before the type of MINNODE and
11243 MAXNODE are transformed, since tree_int_cst_min_precision relies
11244 on the TREE_TYPE of the value it is passed. */
11245 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11246 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11247 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11248 precision = MAX (lowprec, highprec);
11250 if (!fixed_underlying_type_p)
11252 /* Determine the underlying type of the enumeration.
11256 The underlying type of an enumeration is an integral type that
11257 can represent all the enumerator values defined in the
11258 enumeration. It is implementation-defined which integral type is
11259 used as the underlying type for an enumeration except that the
11260 underlying type shall not be larger than int unless the value of
11261 an enumerator cannot fit in an int or unsigned int.
11263 We use "int" or an "unsigned int" as the underlying type, even if
11264 a smaller integral type would work, unless the user has
11265 explicitly requested that we use the smallest possible type. The
11266 user can request that for all enumerations with a command line
11267 flag, or for just one enumeration with an attribute. */
11269 use_short_enum = flag_short_enums
11270 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11272 for (itk = (use_short_enum ? itk_char : itk_int);
11276 underlying_type = integer_types[itk];
11277 if (TYPE_PRECISION (underlying_type) >= precision
11278 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11281 if (itk == itk_none)
11285 IF no integral type can represent all the enumerator values, the
11286 enumeration is ill-formed. */
11287 error ("no integral type can represent all of the enumerator values "
11288 "for %qT", enumtype);
11289 precision = TYPE_PRECISION (long_long_integer_type_node);
11290 underlying_type = integer_types[itk_unsigned_long_long];
11295 The value of sizeof() applied to an enumeration type, an object
11296 of an enumeration type, or an enumerator, is the value of sizeof()
11297 applied to the underlying type. */
11298 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11299 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11300 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11301 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11302 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11303 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11305 /* Set the underlying type of the enumeration type to the
11306 computed enumeration type, restricted to the enumerator
11308 ENUM_UNDERLYING_TYPE (enumtype)
11309 = build_distinct_type_copy (underlying_type);
11310 set_min_and_max_values_for_integral_type
11311 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11314 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11316 /* Compute the minimum and maximum values for the type.
11320 For an enumeration where emin is the smallest enumerator and emax
11321 is the largest, the values of the enumeration are the values of the
11322 underlying type in the range bmin to bmax, where bmin and bmax are,
11323 respectively, the smallest and largest values of the smallest bit-
11324 field that can store emin and emax. */
11326 /* The middle-end currently assumes that types with TYPE_PRECISION
11327 narrower than their underlying type are suitably zero or sign
11328 extended to fill their mode. g++ doesn't make these guarantees.
11329 Until the middle-end can represent such paradoxical types, we
11330 set the TYPE_PRECISION to the width of the underlying type. */
11331 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11333 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11335 /* Convert each of the enumerators to the type of the underlying
11336 type of the enumeration. */
11337 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11339 location_t saved_location;
11341 decl = TREE_VALUE (values);
11342 saved_location = input_location;
11343 input_location = DECL_SOURCE_LOCATION (decl);
11344 if (fixed_underlying_type_p)
11345 /* If the enumeration type has a fixed underlying type, we
11346 already checked all of the enumerator values. */
11347 value = DECL_INITIAL (decl);
11349 value = perform_implicit_conversion (underlying_type,
11350 DECL_INITIAL (decl),
11351 tf_warning_or_error);
11352 input_location = saved_location;
11354 /* Do not clobber shared ints. */
11355 value = copy_node (value);
11357 TREE_TYPE (value) = enumtype;
11358 DECL_INITIAL (decl) = value;
11361 /* Fix up all variant types of this enum type. */
11362 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11364 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11365 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11366 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11367 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11368 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11369 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11370 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11371 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11372 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11373 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11374 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11377 /* Finish up the scope of a scoped enumeration. */
11378 if (SCOPED_ENUM_P (enumtype))
11381 /* Finish debugging output for this type. */
11382 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11385 /* Build and install a CONST_DECL for an enumeration constant of the
11386 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11387 Assignment of sequential values by default is handled here. */
11390 build_enumerator (tree name, tree value, tree enumtype)
11396 /* If the VALUE was erroneous, pretend it wasn't there; that will
11397 result in the enum being assigned the next value in sequence. */
11398 if (value == error_mark_node)
11401 /* Remove no-op casts from the value. */
11403 STRIP_TYPE_NOPS (value);
11405 if (! processing_template_decl)
11407 /* Validate and default VALUE. */
11408 if (value != NULL_TREE)
11410 value = integral_constant_value (value);
11412 if (TREE_CODE (value) == INTEGER_CST)
11414 value = perform_integral_promotions (value);
11415 constant_expression_warning (value);
11419 error ("enumerator value for %qD is not an integer constant", name);
11424 /* Default based on previous value. */
11425 if (value == NULL_TREE)
11427 if (TYPE_VALUES (enumtype))
11430 unsigned HOST_WIDE_INT lo;
11434 /* The next value is the previous value plus one.
11435 add_double doesn't know the type of the target expression,
11436 so we must check with int_fits_type_p as well. */
11437 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11438 if (error_operand_p (prev_value))
11439 value = error_mark_node;
11442 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11443 TREE_INT_CST_HIGH (prev_value),
11445 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11447 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11451 error ("overflow in enumeration values at %qD", name);
11452 value = error_mark_node;
11457 value = integer_zero_node;
11460 /* Remove no-op casts from the value. */
11461 STRIP_TYPE_NOPS (value);
11463 /* If the underlying type of the enum is fixed, check whether
11464 the enumerator values fits in the underlying type. If it
11465 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11466 if (ENUM_UNDERLYING_TYPE (enumtype)
11468 && TREE_CODE (value) == INTEGER_CST
11469 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11471 error ("enumerator value %E is too large for underlying type %<%T%>",
11472 value, ENUM_UNDERLYING_TYPE (enumtype));
11474 /* Silently convert the value so that we can continue. */
11475 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11480 /* C++ associates enums with global, function, or class declarations. */
11481 context = current_scope ();
11483 /* Build the actual enumeration constant. Note that the enumeration
11484 constants have the underlying type of the enum (if it is fixed)
11485 or the type of their initializer (if the underlying type of the
11486 enum is not fixed):
11490 If the underlying type is fixed, the type of each enumerator
11491 prior to the closing brace is the underlying type; if the
11492 initializing value of an enumerator cannot be represented by
11493 the underlying type, the program is ill-formed. If the
11494 underlying type is not fixed, the type of each enumerator is
11495 the type of its initializing value.
11497 If the underlying type is not fixed, it will be computed by
11498 finish_enum and we will reset the type of this enumerator. Of
11499 course, if we're processing a template, there may be no value. */
11500 type = value ? TREE_TYPE (value) : NULL_TREE;
11502 if (context && context == current_class_type)
11503 /* This enum declaration is local to the class. We need the full
11504 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11505 decl = build_lang_decl (CONST_DECL, name, type);
11507 /* It's a global enum, or it's local to a function. (Note local to
11508 a function could mean local to a class method. */
11509 decl = build_decl (input_location, CONST_DECL, name, type);
11511 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11512 TREE_CONSTANT (decl) = 1;
11513 TREE_READONLY (decl) = 1;
11514 DECL_INITIAL (decl) = value;
11516 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11517 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11518 on the TYPE_FIELDS list for `S'. (That's so that you can say
11519 things like `S::i' later.) */
11520 finish_member_declaration (decl);
11524 /* Add this enumeration constant to the list for this type. */
11525 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11528 /* Look for an enumerator with the given NAME within the enumeration
11529 type ENUMTYPE. This routine is used primarily for qualified name
11530 lookup into an enumerator in C++0x, e.g.,
11532 enum class Color { Red, Green, Blue };
11534 Color color = Color::Red;
11536 Returns the value corresponding to the enumerator, or
11537 NULL_TREE if no such enumerator was found. */
11539 lookup_enumerator (tree enumtype, tree name)
11542 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11544 e = purpose_member (name, TYPE_VALUES (enumtype));
11545 return e? TREE_VALUE (e) : NULL_TREE;
11549 /* We're defining DECL. Make sure that its type is OK. */
11552 check_function_type (tree decl, tree current_function_parms)
11554 tree fntype = TREE_TYPE (decl);
11555 tree return_type = complete_type (TREE_TYPE (fntype));
11557 /* In a function definition, arg types must be complete. */
11558 require_complete_types_for_parms (current_function_parms);
11560 /* constexpr functions must have literal argument types and
11561 literal return type. */
11562 validate_constexpr_fundecl (decl);
11564 if (dependent_type_p (return_type))
11566 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11567 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11569 tree args = TYPE_ARG_TYPES (fntype);
11571 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11572 error ("return type %q#T is incomplete", return_type);
11574 error ("return type has Java class type %q#T", return_type);
11576 /* Make it return void instead. */
11577 if (TREE_CODE (fntype) == METHOD_TYPE)
11578 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11580 TREE_CHAIN (args));
11582 fntype = build_function_type (void_type_node, args);
11584 = build_exception_variant (fntype,
11585 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11586 fntype = (cp_build_type_attribute_variant
11587 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11588 TREE_TYPE (decl) = fntype;
11591 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11594 /* Create the FUNCTION_DECL for a function definition.
11595 DECLSPECS and DECLARATOR are the parts of the declaration;
11596 they describe the function's name and the type it returns,
11597 but twisted together in a fashion that parallels the syntax of C.
11599 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11600 DECLARATOR is really the DECL for the function we are about to
11601 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11602 indicating that the function is an inline defined in-class.
11604 This function creates a binding context for the function body
11605 as well as setting up the FUNCTION_DECL in current_function_decl.
11607 For C++, we must first check whether that datum makes any sense.
11608 For example, "class A local_a(1,2);" means that variable local_a
11609 is an aggregate of type A, which should have a constructor
11610 applied to it with the argument list [1, 2].
11612 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11613 or may be a BLOCK if the function has been defined previously
11614 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11615 error_mark_node if the function has never been defined, or
11616 a BLOCK if the function has been defined somewhere. */
11619 start_preparsed_function (tree decl1, tree attrs, int flags)
11621 tree ctype = NULL_TREE;
11624 int doing_friend = 0;
11625 struct cp_binding_level *bl;
11626 tree current_function_parms;
11627 struct c_fileinfo *finfo
11628 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11629 bool honor_interface;
11631 /* Sanity check. */
11632 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11633 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11635 fntype = TREE_TYPE (decl1);
11636 if (TREE_CODE (fntype) == METHOD_TYPE)
11637 ctype = TYPE_METHOD_BASETYPE (fntype);
11639 /* ISO C++ 11.4/5. A friend function defined in a class is in
11640 the (lexical) scope of the class in which it is defined. */
11641 if (!ctype && DECL_FRIEND_P (decl1))
11643 ctype = DECL_FRIEND_CONTEXT (decl1);
11645 /* CTYPE could be null here if we're dealing with a template;
11646 for example, `inline friend float foo()' inside a template
11647 will have no CTYPE set. */
11648 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11654 if (DECL_DECLARED_INLINE_P (decl1)
11655 && lookup_attribute ("noinline", attrs))
11656 warning (0, "inline function %q+D given attribute noinline", decl1);
11658 /* Handle gnu_inline attribute. */
11659 if (GNU_INLINE_P (decl1))
11661 DECL_EXTERNAL (decl1) = 1;
11662 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11663 DECL_INTERFACE_KNOWN (decl1) = 1;
11664 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11667 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11668 /* This is a constructor, we must ensure that any default args
11669 introduced by this definition are propagated to the clones
11670 now. The clones are used directly in overload resolution. */
11671 adjust_clone_args (decl1);
11673 /* Sometimes we don't notice that a function is a static member, and
11674 build a METHOD_TYPE for it. Fix that up now. */
11675 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11676 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11678 revert_static_member_fn (decl1);
11682 /* Set up current_class_type, and enter the scope of the class, if
11685 push_nested_class (ctype);
11686 else if (DECL_STATIC_FUNCTION_P (decl1))
11687 push_nested_class (DECL_CONTEXT (decl1));
11689 /* Now that we have entered the scope of the class, we must restore
11690 the bindings for any template parameters surrounding DECL1, if it
11691 is an inline member template. (Order is important; consider the
11692 case where a template parameter has the same name as a field of
11693 the class.) It is not until after this point that
11694 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11695 if (flags & SF_INCLASS_INLINE)
11696 maybe_begin_member_template_processing (decl1);
11698 /* Effective C++ rule 15. */
11700 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11701 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11702 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11704 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11705 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11706 if (!DECL_INITIAL (decl1))
11707 DECL_INITIAL (decl1) = error_mark_node;
11709 /* This function exists in static storage.
11710 (This does not mean `static' in the C sense!) */
11711 TREE_STATIC (decl1) = 1;
11713 /* We must call push_template_decl after current_class_type is set
11714 up. (If we are processing inline definitions after exiting a
11715 class scope, current_class_type will be NULL_TREE until set above
11716 by push_nested_class.) */
11717 if (processing_template_decl)
11719 /* FIXME: Handle error_mark_node more gracefully. */
11720 tree newdecl1 = push_template_decl (decl1);
11721 if (newdecl1 != error_mark_node)
11725 /* We are now in the scope of the function being defined. */
11726 current_function_decl = decl1;
11728 /* Save the parm names or decls from this function's declarator
11729 where store_parm_decls will find them. */
11730 current_function_parms = DECL_ARGUMENTS (decl1);
11732 /* Make sure the parameter and return types are reasonable. When
11733 you declare a function, these types can be incomplete, but they
11734 must be complete when you define the function. */
11735 check_function_type (decl1, current_function_parms);
11737 /* Build the return declaration for the function. */
11738 restype = TREE_TYPE (fntype);
11739 if (DECL_RESULT (decl1) == NULL_TREE)
11743 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11744 DECL_ARTIFICIAL (resdecl) = 1;
11745 DECL_IGNORED_P (resdecl) = 1;
11746 DECL_RESULT (decl1) = resdecl;
11748 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11751 /* Let the user know we're compiling this function. */
11752 announce_function (decl1);
11754 /* Record the decl so that the function name is defined.
11755 If we already have a decl for this name, and it is a FUNCTION_DECL,
11756 use the old decl. */
11757 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11759 /* A specialization is not used to guide overload resolution. */
11760 if (!DECL_FUNCTION_MEMBER_P (decl1)
11761 && !(DECL_USE_TEMPLATE (decl1) &&
11762 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11764 tree olddecl = pushdecl (decl1);
11766 if (olddecl == error_mark_node)
11767 /* If something went wrong when registering the declaration,
11768 use DECL1; we have to have a FUNCTION_DECL to use when
11769 parsing the body of the function. */
11773 /* Otherwise, OLDDECL is either a previous declaration
11774 of the same function or DECL1 itself. */
11776 if (warn_missing_declarations
11777 && olddecl == decl1
11778 && !DECL_MAIN_P (decl1)
11779 && TREE_PUBLIC (decl1)
11780 && !DECL_DECLARED_INLINE_P (decl1))
11784 /* Check whether DECL1 is in an anonymous
11786 for (context = DECL_CONTEXT (decl1);
11788 context = DECL_CONTEXT (context))
11790 if (TREE_CODE (context) == NAMESPACE_DECL
11791 && DECL_NAME (context) == NULL_TREE)
11795 if (context == NULL)
11796 warning (OPT_Wmissing_declarations,
11797 "no previous declaration for %q+D", decl1);
11805 /* We need to set the DECL_CONTEXT. */
11806 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11807 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11809 fntype = TREE_TYPE (decl1);
11811 /* If #pragma weak applies, mark the decl appropriately now.
11812 The pragma only applies to global functions. Because
11813 determining whether or not the #pragma applies involves
11814 computing the mangled name for the declaration, we cannot
11815 apply the pragma until after we have merged this declaration
11816 with any previous declarations; if the original declaration
11817 has a linkage specification, that specification applies to
11818 the definition as well, and may affect the mangled name. */
11819 if (!DECL_CONTEXT (decl1))
11820 maybe_apply_pragma_weak (decl1);
11823 /* Reset this in case the call to pushdecl changed it. */
11824 current_function_decl = decl1;
11826 gcc_assert (DECL_INITIAL (decl1));
11828 /* This function may already have been parsed, in which case just
11829 return; our caller will skip over the body without parsing. */
11830 if (DECL_INITIAL (decl1) != error_mark_node)
11833 /* Initialize RTL machinery. We cannot do this until
11834 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11835 even when processing a template; this is how we get
11836 CFUN set up, and our per-function variables initialized.
11837 FIXME factor out the non-RTL stuff. */
11838 bl = current_binding_level;
11839 allocate_struct_function (decl1, processing_template_decl);
11841 /* Initialize the language data structures. Whenever we start
11842 a new function, we destroy temporaries in the usual way. */
11843 cfun->language = GGC_CNEW (struct language_function);
11844 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11845 current_binding_level = bl;
11847 /* Even though we're inside a function body, we still don't want to
11848 call expand_expr to calculate the size of a variable-sized array.
11849 We haven't necessarily assigned RTL to all variables yet, so it's
11850 not safe to try to expand expressions involving them. */
11851 cfun->dont_save_pending_sizes_p = 1;
11853 /* Start the statement-tree, start the tree now. */
11854 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11856 /* If we are (erroneously) defining a function that we have already
11857 defined before, wipe out what we knew before. */
11858 if (!DECL_PENDING_INLINE_P (decl1))
11859 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11861 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11863 /* We know that this was set up by `grokclassfn'. We do not
11864 wait until `store_parm_decls', since evil parse errors may
11865 never get us to that point. Here we keep the consistency
11866 between `current_class_type' and `current_class_ptr'. */
11867 tree t = DECL_ARGUMENTS (decl1);
11869 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11870 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11872 cp_function_chain->x_current_class_ref
11873 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11874 cp_function_chain->x_current_class_ptr = t;
11876 /* Constructors and destructors need to know whether they're "in
11877 charge" of initializing virtual base classes. */
11878 t = TREE_CHAIN (t);
11879 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11881 current_in_charge_parm = t;
11882 t = TREE_CHAIN (t);
11884 if (DECL_HAS_VTT_PARM_P (decl1))
11886 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11887 current_vtt_parm = t;
11891 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11892 /* Implicitly-defined methods (like the
11893 destructor for a class in which no destructor
11894 is explicitly declared) must not be defined
11895 until their definition is needed. So, we
11896 ignore interface specifications for
11897 compiler-generated functions. */
11898 && !DECL_ARTIFICIAL (decl1));
11900 if (DECL_INTERFACE_KNOWN (decl1))
11902 tree ctx = decl_function_context (decl1);
11904 if (DECL_NOT_REALLY_EXTERN (decl1))
11905 DECL_EXTERNAL (decl1) = 0;
11907 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11908 && TREE_PUBLIC (ctx))
11909 /* This is a function in a local class in an extern inline
11911 comdat_linkage (decl1);
11913 /* If this function belongs to an interface, it is public.
11914 If it belongs to someone else's interface, it is also external.
11915 This only affects inlines and template instantiations. */
11916 else if (!finfo->interface_unknown && honor_interface)
11918 if (DECL_DECLARED_INLINE_P (decl1)
11919 || DECL_TEMPLATE_INSTANTIATION (decl1)
11920 || processing_template_decl)
11922 DECL_EXTERNAL (decl1)
11923 = (finfo->interface_only
11924 || (DECL_DECLARED_INLINE_P (decl1)
11925 && ! flag_implement_inlines
11926 && !DECL_VINDEX (decl1)));
11928 /* For WIN32 we also want to put these in linkonce sections. */
11929 maybe_make_one_only (decl1);
11932 DECL_EXTERNAL (decl1) = 0;
11933 DECL_INTERFACE_KNOWN (decl1) = 1;
11934 /* If this function is in an interface implemented in this file,
11935 make sure that the back end knows to emit this function
11937 if (!DECL_EXTERNAL (decl1))
11938 mark_needed (decl1);
11940 else if (finfo->interface_unknown && finfo->interface_only
11941 && honor_interface)
11943 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11944 interface, we will have both finfo->interface_unknown and
11945 finfo->interface_only set. In that case, we don't want to
11946 use the normal heuristics because someone will supply a
11947 #pragma implementation elsewhere, and deducing it here would
11948 produce a conflict. */
11949 comdat_linkage (decl1);
11950 DECL_EXTERNAL (decl1) = 0;
11951 DECL_INTERFACE_KNOWN (decl1) = 1;
11952 DECL_DEFER_OUTPUT (decl1) = 1;
11956 /* This is a definition, not a reference.
11957 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11958 if (!GNU_INLINE_P (decl1))
11959 DECL_EXTERNAL (decl1) = 0;
11961 if ((DECL_DECLARED_INLINE_P (decl1)
11962 || DECL_TEMPLATE_INSTANTIATION (decl1))
11963 && ! DECL_INTERFACE_KNOWN (decl1)
11964 /* Don't try to defer nested functions for now. */
11965 && ! decl_function_context (decl1))
11966 DECL_DEFER_OUTPUT (decl1) = 1;
11968 DECL_INTERFACE_KNOWN (decl1) = 1;
11971 /* Determine the ELF visibility attribute for the function. We must not
11972 do this before calling "pushdecl", as we must allow "duplicate_decls"
11973 to merge any attributes appropriately. We also need to wait until
11975 if (!DECL_CLONED_FUNCTION_P (decl1))
11976 determine_visibility (decl1);
11978 begin_scope (sk_function_parms, decl1);
11982 if (DECL_DESTRUCTOR_P (decl1)
11983 || (DECL_CONSTRUCTOR_P (decl1)
11984 && targetm.cxx.cdtor_returns_this ()))
11986 cdtor_label = build_decl (input_location,
11987 LABEL_DECL, NULL_TREE, NULL_TREE);
11988 DECL_CONTEXT (cdtor_label) = current_function_decl;
11991 start_fname_decls ();
11993 store_parm_decls (current_function_parms);
11997 /* Like start_preparsed_function, except that instead of a
11998 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12000 Returns 1 on success. If the DECLARATOR is not suitable for a function
12001 (it defines a datum instead), we return 0, which tells
12002 yyparse to report a parse error. */
12005 start_function (cp_decl_specifier_seq *declspecs,
12006 const cp_declarator *declarator,
12011 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12012 if (decl1 == error_mark_node)
12014 /* If the declarator is not suitable for a function definition,
12015 cause a syntax error. */
12016 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12018 error ("invalid function declaration");
12022 if (DECL_MAIN_P (decl1))
12023 /* main must return int. grokfndecl should have corrected it
12024 (and issued a diagnostic) if the user got it wrong. */
12025 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12026 integer_type_node));
12028 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12033 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12037 use_eh_spec_block (tree fn)
12039 return (flag_exceptions && flag_enforce_eh_specs
12040 && !processing_template_decl
12041 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
12042 /* We insert the EH_SPEC_BLOCK only in the original
12043 function; then, it is copied automatically to the
12045 && !DECL_CLONED_FUNCTION_P (fn)
12046 /* Implicitly-generated constructors and destructors have
12047 exception specifications. However, those specifications
12048 are the union of the possible exceptions specified by the
12049 constructors/destructors for bases and members, so no
12050 unallowed exception will ever reach this function. By
12051 not creating the EH_SPEC_BLOCK we save a little memory,
12052 and we avoid spurious warnings about unreachable
12054 && !DECL_ARTIFICIAL (fn));
12057 /* Store the parameter declarations into the current function declaration.
12058 This is called after parsing the parameter declarations, before
12059 digesting the body of the function.
12061 Also install to binding contour return value identifier, if any. */
12064 store_parm_decls (tree current_function_parms)
12066 tree fndecl = current_function_decl;
12069 /* This is a chain of any other decls that came in among the parm
12070 declarations. If a parm is declared with enum {foo, bar} x;
12071 then CONST_DECLs for foo and bar are put here. */
12072 tree nonparms = NULL_TREE;
12074 if (current_function_parms)
12076 /* This case is when the function was defined with an ANSI prototype.
12077 The parms already have decls, so we need not do anything here
12078 except record them as in effect
12079 and complain if any redundant old-style parm decls were written. */
12081 tree specparms = current_function_parms;
12084 /* Must clear this because it might contain TYPE_DECLs declared
12086 current_binding_level->names = NULL;
12088 /* If we're doing semantic analysis, then we'll call pushdecl
12089 for each of these. We must do them in reverse order so that
12090 they end in the correct forward order. */
12091 specparms = nreverse (specparms);
12093 for (parm = specparms; parm; parm = next)
12095 next = TREE_CHAIN (parm);
12096 if (TREE_CODE (parm) == PARM_DECL)
12098 if (DECL_NAME (parm) == NULL_TREE
12099 || TREE_CODE (parm) != VOID_TYPE)
12102 error ("parameter %qD declared void", parm);
12106 /* If we find an enum constant or a type tag,
12107 put it aside for the moment. */
12108 TREE_CHAIN (parm) = NULL_TREE;
12109 nonparms = chainon (nonparms, parm);
12113 /* Get the decls in their original chain order and record in the
12114 function. This is all and only the PARM_DECLs that were
12115 pushed into scope by the loop above. */
12116 DECL_ARGUMENTS (fndecl) = getdecls ();
12119 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12121 /* Now store the final chain of decls for the arguments
12122 as the decl-chain of the current lexical scope.
12123 Put the enumerators in as well, at the front so that
12124 DECL_ARGUMENTS is not modified. */
12125 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12127 if (use_eh_spec_block (current_function_decl))
12128 current_eh_spec_block = begin_eh_spec_block ();
12132 /* We have finished doing semantic analysis on DECL, but have not yet
12133 generated RTL for its body. Save away our current state, so that
12134 when we want to generate RTL later we know what to do. */
12137 save_function_data (tree decl)
12139 struct language_function *f;
12141 /* Save the language-specific per-function data so that we can
12142 get it back when we really expand this function. */
12143 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12146 f = GGC_NEW (struct language_function);
12147 memcpy (f, cp_function_chain, sizeof (struct language_function));
12148 DECL_SAVED_FUNCTION_DATA (decl) = f;
12150 /* Clear out the bits we don't need. */
12151 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12152 f->bindings = NULL;
12153 f->x_local_names = NULL;
12157 /* Set the return value of the constructor (if present). */
12160 finish_constructor_body (void)
12165 if (targetm.cxx.cdtor_returns_this ()
12166 && (! TYPE_FOR_JAVA (current_class_type)))
12168 /* Any return from a constructor will end up here. */
12169 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12171 val = DECL_ARGUMENTS (current_function_decl);
12172 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12173 DECL_RESULT (current_function_decl), val);
12174 /* Return the address of the object. */
12175 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12176 add_stmt (exprstmt);
12180 /* Do all the processing for the beginning of a destructor; set up the
12181 vtable pointers and cleanups for bases and members. */
12184 begin_destructor_body (void)
12186 tree compound_stmt;
12188 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12189 issued an error message. We still want to try to process the
12190 body of the function, but initialize_vtbl_ptrs will crash if
12191 TYPE_BINFO is NULL. */
12192 if (COMPLETE_TYPE_P (current_class_type))
12194 compound_stmt = begin_compound_stmt (0);
12195 /* Make all virtual function table pointers in non-virtual base
12196 classes point to CURRENT_CLASS_TYPE's virtual function
12198 initialize_vtbl_ptrs (current_class_ptr);
12199 finish_compound_stmt (compound_stmt);
12201 /* And insert cleanups for our bases and members so that they
12202 will be properly destroyed if we throw. */
12203 push_base_cleanups ();
12207 /* At the end of every destructor we generate code to delete the object if
12208 necessary. Do that now. */
12211 finish_destructor_body (void)
12215 /* Any return from a destructor will end up here; that way all base
12216 and member cleanups will be run when the function returns. */
12217 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12219 /* In a virtual destructor, we must call delete. */
12220 if (DECL_VIRTUAL_P (current_function_decl))
12223 tree virtual_size = cxx_sizeof (current_class_type);
12227 At the point of definition of a virtual destructor (including
12228 an implicit definition), non-placement operator delete shall
12229 be looked up in the scope of the destructor's class and if
12230 found shall be accessible and unambiguous. */
12231 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12233 /*global_p=*/false,
12234 /*placement=*/NULL_TREE,
12235 /*alloc_fn=*/NULL_TREE);
12237 if_stmt = begin_if_stmt ();
12238 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12239 current_in_charge_parm,
12242 finish_expr_stmt (exprstmt);
12243 finish_then_clause (if_stmt);
12244 finish_if_stmt (if_stmt);
12247 if (targetm.cxx.cdtor_returns_this ())
12251 val = DECL_ARGUMENTS (current_function_decl);
12252 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12253 DECL_RESULT (current_function_decl), val);
12254 /* Return the address of the object. */
12255 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12256 add_stmt (exprstmt);
12260 /* Do the necessary processing for the beginning of a function body, which
12261 in this case includes member-initializers, but not the catch clauses of
12262 a function-try-block. Currently, this means opening a binding level
12263 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12266 begin_function_body (void)
12270 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12273 if (processing_template_decl)
12274 /* Do nothing now. */;
12276 /* Always keep the BLOCK node associated with the outermost pair of
12277 curly braces of a function. These are needed for correct
12278 operation of dwarfout.c. */
12279 keep_next_level (true);
12281 stmt = begin_compound_stmt (BCS_FN_BODY);
12283 if (processing_template_decl)
12284 /* Do nothing now. */;
12285 else if (DECL_DESTRUCTOR_P (current_function_decl))
12286 begin_destructor_body ();
12291 /* Do the processing for the end of a function body. Currently, this means
12292 closing out the cleanups for fully-constructed bases and members, and in
12293 the case of the destructor, deleting the object if desired. Again, this
12294 is only meaningful for [cd]tors, since they are the only functions where
12295 there is a significant distinction between the main body and any
12296 function catch clauses. Handling, say, main() return semantics here
12297 would be wrong, as flowing off the end of a function catch clause for
12298 main() would also need to return 0. */
12301 finish_function_body (tree compstmt)
12303 if (compstmt == NULL_TREE)
12306 /* Close the block. */
12307 finish_compound_stmt (compstmt);
12309 if (processing_template_decl)
12310 /* Do nothing now. */;
12311 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12312 finish_constructor_body ();
12313 else if (DECL_DESTRUCTOR_P (current_function_decl))
12314 finish_destructor_body ();
12317 /* Given a function, returns the BLOCK corresponding to the outermost level
12318 of curly braces, skipping the artificial block created for constructor
12322 outer_curly_brace_block (tree fndecl)
12324 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12325 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12326 /* Skip the artificial function body block. */
12327 block = BLOCK_SUBBLOCKS (block);
12331 /* Finish up a function declaration and compile that function
12332 all the way to assembler language output. The free the storage
12333 for the function definition.
12335 FLAGS is a bitwise or of the following values:
12337 We just finished processing the body of an in-class inline
12338 function definition. (This processing will have taken place
12339 after the class definition is complete.) */
12342 finish_function (int flags)
12344 tree fndecl = current_function_decl;
12345 tree fntype, ctype = NULL_TREE;
12346 int inclass_inline = (flags & 2) != 0;
12349 /* When we get some parse errors, we can end up without a
12350 current_function_decl, so cope. */
12351 if (fndecl == NULL_TREE)
12352 return error_mark_node;
12354 gcc_assert (!defer_mark_used_calls);
12355 defer_mark_used_calls = true;
12357 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12358 && DECL_VIRTUAL_P (fndecl)
12359 && !processing_template_decl)
12361 tree fnclass = DECL_CONTEXT (fndecl);
12362 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12363 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12366 nested = function_depth > 1;
12367 fntype = TREE_TYPE (fndecl);
12369 /* TREE_READONLY (fndecl) = 1;
12370 This caused &foo to be of type ptr-to-const-function
12371 which then got a warning when stored in a ptr-to-function variable. */
12373 gcc_assert (building_stmt_tree ());
12374 /* The current function is being defined, so its DECL_INITIAL should
12375 be set, and unless there's a multiple definition, it should be
12376 error_mark_node. */
12377 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12379 /* For a cloned function, we've already got all the code we need;
12380 there's no need to add any extra bits. */
12381 if (!DECL_CLONED_FUNCTION_P (fndecl))
12383 if (DECL_MAIN_P (current_function_decl))
12387 /* Make it so that `main' always returns 0 by default (or
12390 stmt = finish_return_stmt (integer_one_node);
12392 stmt = finish_return_stmt (integer_zero_node);
12394 /* Hack. We don't want the middle-end to warn that this
12395 return is unreachable, so put the statement on the
12398 location_t linezero = linemap_line_start (line_table, 0, 1);
12399 SET_EXPR_LOCATION (stmt, linezero);
12403 if (use_eh_spec_block (current_function_decl))
12404 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12405 (TREE_TYPE (current_function_decl)),
12406 current_eh_spec_block);
12409 /* If we're saving up tree structure, tie off the function now. */
12410 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12412 finish_fname_decls ();
12414 /* If this function can't throw any exceptions, remember that. */
12415 if (!processing_template_decl
12416 && !cp_function_chain->can_throw
12417 && !flag_non_call_exceptions
12418 && !DECL_REPLACEABLE_P (fndecl))
12419 TREE_NOTHROW (fndecl) = 1;
12421 /* This must come after expand_function_end because cleanups might
12422 have declarations (from inline functions) that need to go into
12423 this function's blocks. */
12425 /* If the current binding level isn't the outermost binding level
12426 for this function, either there is a bug, or we have experienced
12427 syntax errors and the statement tree is malformed. */
12428 if (current_binding_level->kind != sk_function_parms)
12430 /* Make sure we have already experienced errors. */
12431 gcc_assert (errorcount);
12433 /* Throw away the broken statement tree and extra binding
12435 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12437 while (current_binding_level->kind != sk_function_parms)
12439 if (current_binding_level->kind == sk_class)
12440 pop_nested_class ();
12442 poplevel (0, 0, 0);
12445 poplevel (1, 0, 1);
12447 /* Statements should always be full-expressions at the outermost set
12448 of curly braces for a function. */
12449 gcc_assert (stmts_are_full_exprs_p ());
12451 /* Set up the named return value optimization, if we can. Candidate
12452 variables are selected in check_return_expr. */
12453 if (current_function_return_value)
12455 tree r = current_function_return_value;
12458 if (r != error_mark_node
12459 /* This is only worth doing for fns that return in memory--and
12460 simpler, since we don't have to worry about promoted modes. */
12461 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12462 /* Only allow this for variables declared in the outer scope of
12463 the function so we know that their lifetime always ends with a
12464 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12465 we were to do this optimization in tree-ssa. */
12466 && (outer = outer_curly_brace_block (fndecl))
12467 && chain_member (r, BLOCK_VARS (outer)))
12468 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12470 current_function_return_value = NULL_TREE;
12473 /* Remember that we were in class scope. */
12474 if (current_class_name)
12475 ctype = current_class_type;
12477 /* Must mark the RESULT_DECL as being in this function. */
12478 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12480 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12481 to the FUNCTION_DECL node itself. */
12482 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12484 /* Save away current state, if appropriate. */
12485 if (!processing_template_decl)
12486 save_function_data (fndecl);
12488 /* Complain if there's just no return statement. */
12489 if (warn_return_type
12490 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12491 && !dependent_type_p (TREE_TYPE (fntype))
12492 && !current_function_returns_value && !current_function_returns_null
12493 /* Don't complain if we abort or throw. */
12494 && !current_function_returns_abnormally
12495 && !DECL_NAME (DECL_RESULT (fndecl))
12496 && !TREE_NO_WARNING (fndecl)
12497 /* Structor return values (if any) are set by the compiler. */
12498 && !DECL_CONSTRUCTOR_P (fndecl)
12499 && !DECL_DESTRUCTOR_P (fndecl))
12501 warning (OPT_Wreturn_type,
12502 "no return statement in function returning non-void");
12503 TREE_NO_WARNING (fndecl) = 1;
12506 /* Store the end of the function, so that we get good line number
12507 info for the epilogue. */
12508 cfun->function_end_locus = input_location;
12510 /* Genericize before inlining. */
12511 if (!processing_template_decl)
12513 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12514 invoke_plugin_callbacks (PLUGIN_CXX_CP_PRE_GENERICIZE, fndecl);
12515 cp_genericize (fndecl);
12516 /* Clear out the bits we don't need. */
12517 f->x_current_class_ptr = NULL;
12518 f->x_current_class_ref = NULL;
12519 f->x_eh_spec_block = NULL;
12520 f->x_in_charge_parm = NULL;
12521 f->x_vtt_parm = NULL;
12522 f->x_return_value = NULL;
12523 f->bindings = NULL;
12524 f->extern_decl_map = NULL;
12526 /* Clear out the bits we don't need. */
12527 local_names = NULL;
12529 /* We're leaving the context of this function, so zap cfun. It's still in
12530 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12532 current_function_decl = NULL;
12534 /* If this is an in-class inline definition, we may have to pop the
12535 bindings for the template parameters that we added in
12536 maybe_begin_member_template_processing when start_function was
12538 if (inclass_inline)
12539 maybe_end_member_template_processing ();
12541 /* Leave the scope of the class. */
12543 pop_nested_class ();
12549 /* Let the error reporting routines know that we're outside a
12550 function. For a nested function, this value is used in
12551 cxx_pop_function_context and then reset via pop_function_context. */
12552 current_function_decl = NULL_TREE;
12554 defer_mark_used_calls = false;
12555 if (deferred_mark_used_calls)
12560 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12562 VEC_free (tree, gc, deferred_mark_used_calls);
12568 /* Create the FUNCTION_DECL for a function definition.
12569 DECLSPECS and DECLARATOR are the parts of the declaration;
12570 they describe the return type and the name of the function,
12571 but twisted together in a fashion that parallels the syntax of C.
12573 This function creates a binding context for the function body
12574 as well as setting up the FUNCTION_DECL in current_function_decl.
12576 Returns a FUNCTION_DECL on success.
12578 If the DECLARATOR is not suitable for a function (it defines a datum
12579 instead), we return 0, which tells yyparse to report a parse error.
12581 May return void_type_node indicating that this method is actually
12582 a friend. See grokfield for more details.
12584 Came here with a `.pushlevel' .
12586 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12587 CHANGES TO CODE IN `grokfield'. */
12590 grokmethod (cp_decl_specifier_seq *declspecs,
12591 const cp_declarator *declarator, tree attrlist)
12593 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12596 if (fndecl == error_mark_node)
12597 return error_mark_node;
12599 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12601 error ("invalid member function declaration");
12602 return error_mark_node;
12606 cplus_decl_attributes (&fndecl, attrlist, 0);
12608 /* Pass friends other than inline friend functions back. */
12609 if (fndecl == void_type_node)
12612 if (DECL_IN_AGGR_P (fndecl))
12614 if (DECL_CONTEXT (fndecl)
12615 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12616 error ("%qD is already defined in class %qT", fndecl,
12617 DECL_CONTEXT (fndecl));
12618 return error_mark_node;
12621 check_template_shadow (fndecl);
12623 DECL_DECLARED_INLINE_P (fndecl) = 1;
12624 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12626 /* We process method specializations in finish_struct_1. */
12627 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12629 fndecl = push_template_decl (fndecl);
12630 if (fndecl == error_mark_node)
12634 if (! DECL_FRIEND_P (fndecl))
12636 if (TREE_CHAIN (fndecl))
12638 fndecl = copy_node (fndecl);
12639 TREE_CHAIN (fndecl) = NULL_TREE;
12643 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12645 DECL_IN_AGGR_P (fndecl) = 1;
12650 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12651 we can lay it out later, when and if its type becomes complete. */
12654 maybe_register_incomplete_var (tree var)
12656 gcc_assert (TREE_CODE (var) == VAR_DECL);
12658 /* Keep track of variables with incomplete types. */
12659 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12660 && DECL_EXTERNAL (var))
12662 tree inner_type = TREE_TYPE (var);
12664 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12665 inner_type = TREE_TYPE (inner_type);
12666 inner_type = TYPE_MAIN_VARIANT (inner_type);
12668 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12669 /* RTTI TD entries are created while defining the type_info. */
12670 || (TYPE_LANG_SPECIFIC (inner_type)
12671 && TYPE_BEING_DEFINED (inner_type)))
12672 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12676 /* Called when a class type (given by TYPE) is defined. If there are
12677 any existing VAR_DECLs whose type has been completed by this
12678 declaration, update them now. */
12681 complete_vars (tree type)
12683 tree *list = &incomplete_vars;
12685 gcc_assert (CLASS_TYPE_P (type));
12688 if (same_type_p (type, TREE_PURPOSE (*list)))
12690 tree var = TREE_VALUE (*list);
12691 tree type = TREE_TYPE (var);
12692 /* Complete the type of the variable. The VAR_DECL itself
12693 will be laid out in expand_expr. */
12694 complete_type (type);
12695 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12696 /* Remove this entry from the list. */
12697 *list = TREE_CHAIN (*list);
12700 list = &TREE_CHAIN (*list);
12703 /* Check for pending declarations which may have abstract type. */
12704 complete_type_check_abstract (type);
12707 /* If DECL is of a type which needs a cleanup, build and return an
12708 expression to perform that cleanup here. Return NULL_TREE if no
12709 cleanup need be done. */
12712 cxx_maybe_build_cleanup (tree decl)
12718 /* Assume no cleanup is required. */
12719 cleanup = NULL_TREE;
12721 if (error_operand_p (decl))
12724 /* Handle "__attribute__((cleanup))". We run the cleanup function
12725 before the destructor since the destructor is what actually
12726 terminates the lifetime of the object. */
12727 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12734 /* Get the name specified by the user for the cleanup function. */
12735 id = TREE_VALUE (TREE_VALUE (attr));
12736 /* Look up the name to find the cleanup function to call. It is
12737 important to use lookup_name here because that is what is
12738 used in c-common.c:handle_cleanup_attribute when performing
12739 initial checks on the attribute. Note that those checks
12740 include ensuring that the function found is not an overloaded
12741 function, or an object with an overloaded call operator,
12742 etc.; we can rely on the fact that the function found is an
12743 ordinary FUNCTION_DECL. */
12744 fn = lookup_name (id);
12745 arg = build_address (decl);
12747 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12749 tf_warning_or_error);
12751 /* Handle ordinary C++ destructors. */
12752 type = TREE_TYPE (decl);
12753 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12755 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12756 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12757 && CLASSTYPE_VBASECLASSES (type));
12761 if (TREE_CODE (type) == ARRAY_TYPE)
12764 addr = build_address (decl);
12766 /* Optimize for space over speed here. */
12767 if (!has_vbases || flag_expensive_optimizations)
12768 flags |= LOOKUP_NONVIRTUAL;
12770 call = build_delete (TREE_TYPE (addr), addr,
12771 sfk_complete_destructor, flags, 0);
12773 cleanup = build_compound_expr (input_location, cleanup, call);
12781 /* When a stmt has been parsed, this function is called. */
12788 /* DECL was originally constructed as a non-static member function,
12789 but turned out to be static. Update it accordingly. */
12792 revert_static_member_fn (tree decl)
12795 tree function = TREE_TYPE (decl);
12796 tree args = TYPE_ARG_TYPES (function);
12798 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12799 != TYPE_UNQUALIFIED)
12800 error ("static member function %q#D declared with type qualifiers", decl);
12802 args = TREE_CHAIN (args);
12803 tmp = build_function_type (TREE_TYPE (function), args);
12804 tmp = build_qualified_type (tmp, cp_type_quals (function));
12805 tmp = build_exception_variant (tmp,
12806 TYPE_RAISES_EXCEPTIONS (function));
12807 TREE_TYPE (decl) = tmp;
12808 if (DECL_ARGUMENTS (decl))
12809 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12810 DECL_STATIC_FUNCTION_P (decl) = 1;
12813 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12814 one of the language-independent trees. */
12816 enum cp_tree_node_structure_enum
12817 cp_tree_node_structure (union lang_tree_node * t)
12819 switch (TREE_CODE (&t->generic))
12821 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12822 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12823 case OVERLOAD: return TS_CP_OVERLOAD;
12824 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12825 case PTRMEM_CST: return TS_CP_PTRMEM;
12826 case BASELINK: return TS_CP_BASELINK;
12827 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12828 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12829 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12830 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
12831 default: return TS_CP_GENERIC;
12835 /* Build the void_list_node (void_type_node having been created). */
12837 build_void_list_node (void)
12839 tree t = build_tree_list (NULL_TREE, void_type_node);
12844 cp_missing_noreturn_ok_p (tree decl)
12846 /* A missing noreturn is ok for the `main' function. */
12847 return DECL_MAIN_P (decl);
12850 /* Return the COMDAT group into which DECL should be placed. */
12853 cxx_comdat_group (tree decl)
12857 /* Virtual tables, construction virtual tables, and virtual table
12858 tables all go in a single COMDAT group, named after the primary
12860 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12861 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12862 /* For all other DECLs, the COMDAT group is the mangled name of the
12863 declaration itself. */
12866 while (DECL_THUNK_P (decl))
12868 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12869 into the same section as the target function. In that case
12870 we must return target's name. */
12871 tree target = THUNK_TARGET (decl);
12872 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12873 && DECL_SECTION_NAME (target) != NULL
12874 && DECL_ONE_ONLY (target))
12879 name = DECL_ASSEMBLER_NAME (decl);
12885 #include "gt-cp-decl.h"