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_BUILT_IN (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 /* All nesting of C++ functions is lexical; there is never a "static
3584 chain" in the sense of GNU C nested functions. */
3585 DECL_NO_STATIC_CHAIN (decl) = 1;
3587 DECL_ARTIFICIAL (decl) = 1;
3588 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3589 SET_DECL_LANGUAGE (decl, lang_c);
3590 /* Runtime library routines are, by definition, available in an
3591 external shared object. */
3592 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3593 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3595 DECL_CONTEXT (decl) = context;
3598 pushdecl_top_level (decl);
3602 /* A function in the user's namespace should have an explicit
3603 declaration before it is used. Mark the built-in function as
3604 anticipated but not actually declared. */
3605 if (name[0] != '_' || name[1] != '_')
3606 DECL_ANTICIPATED (decl) = 1;
3607 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3609 size_t len = strlen (name);
3611 /* Treat __*_chk fortification functions as anticipated as well,
3612 unless they are __builtin_*. */
3613 if (len > strlen ("___chk")
3614 && memcmp (name + len - strlen ("_chk"),
3615 "_chk", strlen ("_chk") + 1) == 0)
3616 DECL_ANTICIPATED (decl) = 1;
3623 cxx_builtin_function (tree decl)
3625 tree id = DECL_NAME (decl);
3626 const char *name = IDENTIFIER_POINTER (id);
3627 /* All builtins that don't begin with an '_' should additionally
3628 go in the 'std' namespace. */
3631 tree decl2 = copy_node(decl);
3632 push_namespace (std_identifier);
3633 builtin_function_1 (decl2, std_node, false);
3637 return builtin_function_1 (decl, NULL_TREE, false);
3640 /* Like cxx_builtin_function, but guarantee the function is added to the global
3641 scope. This is to allow function specific options to add new machine
3642 dependent builtins when the target ISA changes via attribute((target(...)))
3643 which saves space on program startup if the program does not use non-generic
3647 cxx_builtin_function_ext_scope (tree decl)
3650 tree id = DECL_NAME (decl);
3651 const char *name = IDENTIFIER_POINTER (id);
3652 /* All builtins that don't begin with an '_' should additionally
3653 go in the 'std' namespace. */
3656 tree decl2 = copy_node(decl);
3657 push_namespace (std_identifier);
3658 builtin_function_1 (decl2, std_node, true);
3662 return builtin_function_1 (decl, NULL_TREE, true);
3665 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3666 function. Not called directly. */
3669 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3671 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3672 DECL_EXTERNAL (fn) = 1;
3673 TREE_PUBLIC (fn) = 1;
3674 DECL_ARTIFICIAL (fn) = 1;
3675 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3676 SET_DECL_LANGUAGE (fn, lang_c);
3677 /* Runtime library routines are, by definition, available in an
3678 external shared object. */
3679 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3680 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3684 /* Returns the _DECL for a library function with C linkage.
3685 We assume that such functions never throw; if this is incorrect,
3686 callers should unset TREE_NOTHROW. */
3689 build_library_fn (tree name, tree type)
3691 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3692 TREE_NOTHROW (fn) = 1;
3696 /* Returns the _DECL for a library function with C++ linkage. */
3699 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3701 tree fn = build_library_fn_1 (name, operator_code, type);
3702 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3703 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3704 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3708 /* Like build_library_fn, but takes a C string instead of an
3712 build_library_fn_ptr (const char* name, tree type)
3714 return build_library_fn (get_identifier (name), type);
3717 /* Like build_cp_library_fn, but takes a C string instead of an
3721 build_cp_library_fn_ptr (const char* name, tree type)
3723 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3726 /* Like build_library_fn, but also pushes the function so that we will
3727 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3728 may throw exceptions listed in RAISES. */
3731 push_library_fn (tree name, tree type, tree raises)
3736 type = build_exception_variant (type, raises);
3738 fn = build_library_fn (name, type);
3739 pushdecl_top_level (fn);
3743 /* Like build_cp_library_fn, but also pushes the function so that it
3744 will be found by normal lookup. */
3747 push_cp_library_fn (enum tree_code operator_code, tree type)
3749 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3756 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3760 push_void_library_fn (tree name, tree parmtypes)
3762 tree type = build_function_type (void_type_node, parmtypes);
3763 return push_library_fn (name, type, NULL_TREE);
3766 /* Like push_library_fn, but also note that this function throws
3767 and does not return. Used for __throw_foo and the like. */
3770 push_throw_library_fn (tree name, tree type)
3772 tree fn = push_library_fn (name, type, NULL_TREE);
3773 TREE_THIS_VOLATILE (fn) = 1;
3774 TREE_NOTHROW (fn) = 0;
3778 /* When we call finish_struct for an anonymous union, we create
3779 default copy constructors and such. But, an anonymous union
3780 shouldn't have such things; this function undoes the damage to the
3781 anonymous union type T.
3783 (The reason that we create the synthesized methods is that we don't
3784 distinguish `union { int i; }' from `typedef union { int i; } U'.
3785 The first is an anonymous union; the second is just an ordinary
3789 fixup_anonymous_aggr (tree t)
3793 /* Wipe out memory of synthesized methods. */
3794 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3795 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3796 TYPE_HAS_INIT_REF (t) = 0;
3797 TYPE_HAS_CONST_INIT_REF (t) = 0;
3798 TYPE_HAS_ASSIGN_REF (t) = 0;
3799 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3801 /* Splice the implicitly generated functions out of the TYPE_METHODS
3803 q = &TYPE_METHODS (t);
3806 if (DECL_ARTIFICIAL (*q))
3807 *q = TREE_CHAIN (*q);
3809 q = &TREE_CHAIN (*q);
3812 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3813 if (TYPE_METHODS (t))
3815 tree decl = TYPE_MAIN_DECL (t);
3817 if (TREE_CODE (t) != UNION_TYPE)
3818 error_at (DECL_SOURCE_LOCATION (decl),
3819 "an anonymous struct cannot have function members");
3821 error_at (DECL_SOURCE_LOCATION (decl),
3822 "an anonymous union cannot have function members");
3825 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3826 assignment operators (because they cannot have these methods themselves).
3827 For anonymous unions this is already checked because they are not allowed
3828 in any union, otherwise we have to check it. */
3829 if (TREE_CODE (t) != UNION_TYPE)
3833 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3834 if (TREE_CODE (field) == FIELD_DECL)
3836 type = TREE_TYPE (field);
3837 if (CLASS_TYPE_P (type))
3839 if (TYPE_NEEDS_CONSTRUCTING (type))
3840 error ("member %q+#D with constructor not allowed "
3841 "in anonymous aggregate", field);
3842 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3843 error ("member %q+#D with destructor not allowed "
3844 "in anonymous aggregate", field);
3845 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3846 error ("member %q+#D with copy assignment operator "
3847 "not allowed in anonymous aggregate", field);
3853 /* Make sure that a declaration with no declarator is well-formed, i.e.
3854 just declares a tagged type or anonymous union.
3856 Returns the type declared; or NULL_TREE if none. */
3859 check_tag_decl (cp_decl_specifier_seq *declspecs)
3861 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3862 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3863 /* If a class, struct, or enum type is declared by the DECLSPECS
3864 (i.e, if a class-specifier, enum-specifier, or non-typename
3865 elaborated-type-specifier appears in the DECLSPECS),
3866 DECLARED_TYPE is set to the corresponding type. */
3867 tree declared_type = NULL_TREE;
3868 bool error_p = false;
3870 if (declspecs->multiple_types_p)
3871 error ("multiple types in one declaration");
3872 else if (declspecs->redefined_builtin_type)
3874 if (!in_system_header)
3875 permerror (input_location, "redeclaration of C++ built-in type %qT",
3876 declspecs->redefined_builtin_type);
3881 && TYPE_P (declspecs->type)
3882 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3883 && MAYBE_CLASS_TYPE_P (declspecs->type))
3884 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3885 declared_type = declspecs->type;
3886 else if (declspecs->type == error_mark_node)
3888 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3889 permerror (input_location, "declaration does not declare anything");
3890 /* Check for an anonymous union. */
3891 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3892 && TYPE_ANONYMOUS_P (declared_type))
3894 /* 7/3 In a simple-declaration, the optional init-declarator-list
3895 can be omitted only when declaring a class (clause 9) or
3896 enumeration (7.2), that is, when the decl-specifier-seq contains
3897 either a class-specifier, an elaborated-type-specifier with
3898 a class-key (9.1), or an enum-specifier. In these cases and
3899 whenever a class-specifier or enum-specifier is present in the
3900 decl-specifier-seq, the identifiers in these specifiers are among
3901 the names being declared by the declaration (as class-name,
3902 enum-names, or enumerators, depending on the syntax). In such
3903 cases, and except for the declaration of an unnamed bit-field (9.6),
3904 the decl-specifier-seq shall introduce one or more names into the
3905 program, or shall redeclare a name introduced by a previous
3906 declaration. [Example:
3907 enum { }; // ill-formed
3908 typedef class { }; // ill-formed
3912 error ("missing type-name in typedef-declaration");
3915 /* Anonymous unions are objects, so they can have specifiers. */;
3916 SET_ANON_AGGR_TYPE_P (declared_type);
3918 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3919 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3924 if (declspecs->specs[(int)ds_inline]
3925 || declspecs->specs[(int)ds_virtual])
3926 error ("%qs can only be specified for functions",
3927 declspecs->specs[(int)ds_inline]
3928 ? "inline" : "virtual");
3930 && (!current_class_type
3931 || current_scope () != current_class_type))
3932 error ("%<friend%> can only be specified inside a class");
3933 else if (declspecs->specs[(int)ds_explicit])
3934 error ("%<explicit%> can only be specified for constructors");
3935 else if (declspecs->storage_class)
3936 error ("a storage class can only be specified for objects "
3938 else if (declspecs->specs[(int)ds_const]
3939 || declspecs->specs[(int)ds_volatile]
3940 || declspecs->specs[(int)ds_restrict]
3941 || declspecs->specs[(int)ds_thread])
3942 error ("qualifiers can only be specified for objects "
3944 else if (saw_typedef)
3945 warning (0, "%<typedef%> was ignored in this declaration");
3948 return declared_type;
3951 /* Called when a declaration is seen that contains no names to declare.
3952 If its type is a reference to a structure, union or enum inherited
3953 from a containing scope, shadow that tag name for the current scope
3954 with a forward reference.
3955 If its type defines a new named structure or union
3956 or defines an enum, it is valid but we need not do anything here.
3957 Otherwise, it is an error.
3959 C++: may have to grok the declspecs to learn about static,
3960 complain for anonymous unions.
3962 Returns the TYPE declared -- or NULL_TREE if none. */
3965 shadow_tag (cp_decl_specifier_seq *declspecs)
3967 tree t = check_tag_decl (declspecs);
3972 if (declspecs->attributes)
3974 warning (0, "attribute ignored in declaration of %q+#T", t);
3975 warning (0, "attribute for %q+#T must follow the %qs keyword",
3976 t, class_key_or_enum_as_string (t));
3980 if (maybe_process_partial_specialization (t) == error_mark_node)
3983 /* This is where the variables in an anonymous union are
3984 declared. An anonymous union declaration looks like:
3986 because there is no declarator after the union, the parser
3987 sends that declaration here. */
3988 if (ANON_AGGR_TYPE_P (t))
3990 fixup_anonymous_aggr (t);
3992 if (TYPE_FIELDS (t))
3994 tree decl = grokdeclarator (/*declarator=*/NULL,
3995 declspecs, NORMAL, 0, NULL);
3996 finish_anon_union (decl);
4003 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4006 groktypename (cp_decl_specifier_seq *type_specifiers,
4007 const cp_declarator *declarator,
4008 bool is_template_arg)
4012 enum decl_context context
4013 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4014 attrs = type_specifiers->attributes;
4015 type_specifiers->attributes = NULL_TREE;
4016 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4017 if (attrs && type != error_mark_node)
4019 if (CLASS_TYPE_P (type))
4020 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4021 "outside of definition", type);
4022 else if (MAYBE_CLASS_TYPE_P (type))
4023 /* A template type parameter or other dependent type. */
4024 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4025 "type %qT without an associated declaration", type);
4027 cplus_decl_attributes (&type, attrs, 0);
4032 /* Process a DECLARATOR for a function-scope variable declaration,
4033 namespace-scope variable declaration, or function declaration.
4034 (Function definitions go through start_function; class member
4035 declarations appearing in the body of the class go through
4036 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4037 If an error occurs, the error_mark_node is returned instead.
4039 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4040 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4041 for an explicitly defaulted function, or SD_DELETED for an explicitly
4042 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4043 implicitly initialized via a default constructor. ATTRIBUTES and
4044 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4045 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4046 set, the caller is responsible for calling pop_scope. */
4049 start_decl (const cp_declarator *declarator,
4050 cp_decl_specifier_seq *declspecs,
4053 tree prefix_attributes,
4054 tree *pushed_scope_p)
4062 *pushed_scope_p = NULL_TREE;
4064 /* An object declared as __attribute__((deprecated)) suppresses
4065 warnings of uses of other deprecated items. */
4066 if (lookup_attribute ("deprecated", attributes))
4067 deprecated_state = DEPRECATED_SUPPRESS;
4069 attributes = chainon (attributes, prefix_attributes);
4071 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4074 deprecated_state = DEPRECATED_NORMAL;
4076 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4077 || decl == error_mark_node)
4078 return error_mark_node;
4080 type = TREE_TYPE (decl);
4082 context = DECL_CONTEXT (decl);
4086 *pushed_scope_p = push_scope (context);
4088 /* We are only interested in class contexts, later. */
4089 if (TREE_CODE (context) == NAMESPACE_DECL)
4090 context = NULL_TREE;
4094 /* Is it valid for this decl to have an initializer at all?
4095 If not, set INITIALIZED to zero, which will indirectly
4096 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4097 switch (TREE_CODE (decl))
4100 error ("typedef %qD is initialized (use decltype instead)", decl);
4101 return error_mark_node;
4104 if (initialized == SD_DELETED)
4105 /* We'll handle the rest of the semantics later, but we need to
4106 set this now so it's visible to duplicate_decls. */
4107 DECL_DELETED_FN (decl) = 1;
4116 if (! toplevel_bindings_p ()
4117 && DECL_EXTERNAL (decl))
4118 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4120 DECL_EXTERNAL (decl) = 0;
4121 if (toplevel_bindings_p ())
4122 TREE_STATIC (decl) = 1;
4125 /* If this is a typedef that names the class for linkage purposes
4126 (7.1.3p8), apply any attributes directly to the type. */
4127 if (TREE_CODE (decl) == TYPE_DECL
4128 && TAGGED_TYPE_P (TREE_TYPE (decl))
4129 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4130 flags = ATTR_FLAG_TYPE_IN_PLACE;
4134 /* Set attributes here so if duplicate decl, will have proper attributes. */
4135 cplus_decl_attributes (&decl, attributes, flags);
4137 /* Dllimported symbols cannot be defined. Static data members (which
4138 can be initialized in-class and dllimported) go through grokfield,
4139 not here, so we don't need to exclude those decls when checking for
4141 if (initialized && DECL_DLLIMPORT_P (decl))
4143 error ("definition of %q#D is marked %<dllimport%>", decl);
4144 DECL_DLLIMPORT_P (decl) = 0;
4147 /* If #pragma weak was used, mark the decl weak now. */
4148 maybe_apply_pragma_weak (decl);
4150 if (TREE_CODE (decl) == FUNCTION_DECL
4151 && DECL_DECLARED_INLINE_P (decl)
4152 && DECL_UNINLINABLE (decl)
4153 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4154 warning (0, "inline function %q+D given attribute noinline", decl);
4156 if (context && COMPLETE_TYPE_P (complete_type (context)))
4158 if (TREE_CODE (decl) == VAR_DECL)
4160 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4161 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4162 error ("%q#D is not a static member of %q#T", decl, context);
4165 if (DECL_CONTEXT (field) != context)
4167 if (!same_type_p (DECL_CONTEXT (field), context))
4168 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4169 "to be defined as %<%T::%D%>",
4170 DECL_CONTEXT (field), DECL_NAME (decl),
4171 context, DECL_NAME (decl));
4172 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4174 if (processing_specialization
4175 && template_class_depth (context) == 0
4176 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4177 error ("template header not allowed in member definition "
4178 "of explicitly specialized class");
4179 /* Static data member are tricky; an in-class initialization
4180 still doesn't provide a definition, so the in-class
4181 declaration will have DECL_EXTERNAL set, but will have an
4182 initialization. Thus, duplicate_decls won't warn
4183 about this situation, and so we check here. */
4184 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4185 error ("duplicate initialization of %qD", decl);
4186 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4192 tree field = check_classfn (context, decl,
4193 (processing_template_decl
4194 > template_class_depth (context))
4195 ? current_template_parms
4197 if (field && field != error_mark_node
4198 && duplicate_decls (decl, field,
4199 /*newdecl_is_friend=*/false))
4203 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4204 DECL_IN_AGGR_P (decl) = 0;
4205 /* Do not mark DECL as an explicit specialization if it was not
4206 already marked as an instantiation; a declaration should
4207 never be marked as a specialization unless we know what
4208 template is being specialized. */
4209 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4211 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4213 /* [temp.expl.spec] An explicit specialization of a static data
4214 member of a template is a definition if the declaration
4215 includes an initializer; otherwise, it is a declaration.
4217 We check for processing_specialization so this only applies
4218 to the new specialization syntax. */
4219 if (!initialized && processing_specialization)
4220 DECL_EXTERNAL (decl) = 1;
4223 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4224 permerror (input_location, "declaration of %q#D outside of class is not definition",
4228 was_public = TREE_PUBLIC (decl);
4230 /* Enter this declaration into the symbol table. */
4231 decl = maybe_push_decl (decl);
4233 if (processing_template_decl)
4234 decl = push_template_decl (decl);
4235 if (decl == error_mark_node)
4236 return error_mark_node;
4238 /* Tell the back end to use or not use .common as appropriate. If we say
4239 -fconserve-space, we want this to save .data space, at the expense of
4240 wrong semantics. If we say -fno-conserve-space, we want this to
4241 produce errors about redefs; to do this we force variables into the
4243 if (flag_conserve_space
4244 && TREE_CODE (decl) == VAR_DECL
4245 && TREE_PUBLIC (decl)
4246 && !DECL_THREAD_LOCAL_P (decl)
4247 && !have_global_bss_p ())
4248 DECL_COMMON (decl) = 1;
4250 if (TREE_CODE (decl) == VAR_DECL
4251 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4252 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4254 /* This is a const variable with implicit 'static'. Set
4255 DECL_THIS_STATIC so we can tell it from variables that are
4256 !TREE_PUBLIC because of the anonymous namespace. */
4257 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4258 DECL_THIS_STATIC (decl) = 1;
4261 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4262 start_decl_1 (decl, initialized);
4267 /* Process the declaration of a variable DECL. INITIALIZED is true
4268 iff DECL is explicitly initialized. (INITIALIZED is false if the
4269 variable is initialized via an implicitly-called constructor.)
4270 This function must be called for ordinary variables (including, for
4271 example, implicit instantiations of templates), but must not be
4272 called for template declarations. */
4275 start_decl_1 (tree decl, bool initialized)
4279 bool aggregate_definition_p;
4281 gcc_assert (!processing_template_decl);
4283 if (error_operand_p (decl))
4286 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4288 type = TREE_TYPE (decl);
4289 complete_p = COMPLETE_TYPE_P (type);
4290 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4292 /* If an explicit initializer is present, or if this is a definition
4293 of an aggregate, then we need a complete type at this point.
4294 (Scalars are always complete types, so there is nothing to
4295 check.) This code just sets COMPLETE_P; errors (if necessary)
4296 are issued below. */
4297 if ((initialized || aggregate_definition_p)
4299 && COMPLETE_TYPE_P (complete_type (type)))
4302 /* We will not yet have set TREE_READONLY on DECL if the type
4303 was "const", but incomplete, before this point. But, now, we
4304 have a complete type, so we can try again. */
4305 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4309 /* Is it valid for this decl to have an initializer at all? */
4311 /* Don't allow initializations for incomplete types except for
4312 arrays which might be completed by the initialization. */
4314 ; /* A complete type is ok. */
4315 else if (type_uses_auto (type))
4316 ; /* An auto type is ok. */
4317 else if (TREE_CODE (type) != ARRAY_TYPE)
4319 error ("variable %q#D has initializer but incomplete type", decl);
4320 type = TREE_TYPE (decl) = error_mark_node;
4322 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4324 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4325 error ("elements of array %q#D have incomplete type", decl);
4326 /* else we already gave an error in start_decl. */
4329 else if (aggregate_definition_p && !complete_p)
4331 if (type_uses_auto (type))
4332 error ("declaration of %q#D has no initializer", decl);
4334 error ("aggregate %q#D has incomplete type and cannot be defined",
4336 /* Change the type so that assemble_variable will give
4337 DECL an rtl we can live with: (mem (const_int 0)). */
4338 type = TREE_TYPE (decl) = error_mark_node;
4341 /* Create a new scope to hold this declaration if necessary.
4342 Whether or not a new scope is necessary cannot be determined
4343 until after the type has been completed; if the type is a
4344 specialization of a class template it is not until after
4345 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4346 will be set correctly. */
4347 maybe_push_cleanup_level (type);
4350 /* Handle initialization of references. DECL, TYPE, and INIT have the
4351 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4352 but will be set to a new CLEANUP_STMT if a temporary is created
4353 that must be destroyed subsequently.
4355 Returns an initializer expression to use to initialize DECL, or
4356 NULL if the initialization can be performed statically.
4358 Quotes on semantics can be found in ARM 8.4.3. */
4361 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4365 if (init == NULL_TREE)
4367 if ((DECL_LANG_SPECIFIC (decl) == 0
4368 || DECL_IN_AGGR_P (decl) == 0)
4369 && ! DECL_THIS_EXTERN (decl))
4370 error ("%qD declared as reference but not initialized", decl);
4374 if (TREE_CODE (init) == TREE_LIST)
4375 init = build_x_compound_expr_from_list (init, "initializer");
4377 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4378 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4379 /* Note: default conversion is only called in very special cases. */
4380 init = decay_conversion (init);
4382 /* Convert INIT to the reference type TYPE. This may involve the
4383 creation of a temporary, whose lifetime must be the same as that
4384 of the reference. If so, a DECL_EXPR for the temporary will be
4385 added just after the DECL_EXPR for DECL. That's why we don't set
4386 DECL_INITIAL for local references (instead assigning to them
4387 explicitly); we need to allow the temporary to be initialized
4389 tmp = initialize_reference (type, init, decl, cleanup);
4391 if (tmp == error_mark_node)
4393 else if (tmp == NULL_TREE)
4395 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4399 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4402 DECL_INITIAL (decl) = tmp;
4407 /* Subroutine of check_initializer. We're initializing a DECL of
4408 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4409 extend the lifetime of the underlying array to match that of the decl,
4410 just like for reference initialization. CLEANUP is as for
4411 grok_reference_init. */
4414 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4416 tree aggr_init, array, arrtype;
4417 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4418 if (error_operand_p (init))
4419 return error_mark_node;
4421 aggr_init = TARGET_EXPR_INITIAL (init);
4422 init = build2 (INIT_EXPR, type, decl, init);
4424 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4425 arrtype = TREE_TYPE (array);
4427 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4428 array = TREE_OPERAND (array, 0);
4429 /* If the array is constant, finish_compound_literal already made it a
4430 static variable and we don't need to do anything here. */
4431 if (decl && TREE_CODE (array) == TARGET_EXPR)
4434 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4435 var = build_address (var);
4436 var = convert (arrtype, var);
4437 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4438 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4443 /* Designated initializers in arrays are not supported in GNU C++.
4444 The parser cannot detect this error since it does not know whether
4445 a given brace-enclosed initializer is for a class type or for an
4446 array. This function checks that CE does not use a designated
4447 initializer. If it does, an error is issued. Returns true if CE
4448 is valid, i.e., does not have a designated initializer. */
4451 check_array_designated_initializer (const constructor_elt *ce)
4453 /* Designated initializers for array elements are not supported. */
4456 /* The parser only allows identifiers as designated
4458 if (ce->index == error_mark_node)
4459 error ("name used in a GNU-style designated "
4460 "initializer for an array");
4463 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4464 error ("name %qD used in a GNU-style designated "
4465 "initializer for an array", ce->index);
4473 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4474 array until we finish parsing the initializer. If that's the
4475 situation we're in, update DECL accordingly. */
4478 maybe_deduce_size_from_array_init (tree decl, tree init)
4480 tree type = TREE_TYPE (decl);
4482 if (TREE_CODE (type) == ARRAY_TYPE
4483 && TYPE_DOMAIN (type) == NULL_TREE
4484 && TREE_CODE (decl) != TYPE_DECL)
4486 /* do_default is really a C-ism to deal with tentative definitions.
4487 But let's leave it here to ease the eventual merge. */
4488 int do_default = !DECL_EXTERNAL (decl);
4489 tree initializer = init ? init : DECL_INITIAL (decl);
4492 /* Check that there are no designated initializers in INIT, as
4493 those are not supported in GNU C++, and as the middle-end
4494 will crash if presented with a non-numeric designated
4496 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4498 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4499 constructor_elt *ce;
4502 VEC_iterate (constructor_elt, v, i, ce);
4504 if (!check_array_designated_initializer (ce))
4510 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4514 error ("initializer fails to determine size of %qD", decl);
4515 TREE_TYPE (decl) = error_mark_node;
4517 else if (failure == 2)
4521 error ("array size missing in %qD", decl);
4522 TREE_TYPE (decl) = error_mark_node;
4524 /* If a `static' var's size isn't known, make it extern as
4525 well as static, so it does not get allocated. If it's not
4526 `static', then don't mark it extern; finish_incomplete_decl
4527 will give it a default size and it will get allocated. */
4528 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4529 DECL_EXTERNAL (decl) = 1;
4531 else if (failure == 3)
4533 error ("zero-size array %qD", decl);
4534 TREE_TYPE (decl) = error_mark_node;
4538 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4540 relayout_decl (decl);
4544 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4545 any appropriate error messages regarding the layout. */
4548 layout_var_decl (tree decl)
4552 type = TREE_TYPE (decl);
4553 if (type == error_mark_node)
4556 /* If we haven't already layed out this declaration, do so now.
4557 Note that we must not call complete type for an external object
4558 because it's type might involve templates that we are not
4559 supposed to instantiate yet. (And it's perfectly valid to say
4560 `extern X x' for some incomplete type `X'.) */
4561 if (!DECL_EXTERNAL (decl))
4562 complete_type (type);
4563 if (!DECL_SIZE (decl)
4564 && TREE_TYPE (decl) != error_mark_node
4565 && (COMPLETE_TYPE_P (type)
4566 || (TREE_CODE (type) == ARRAY_TYPE
4567 && !TYPE_DOMAIN (type)
4568 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4569 layout_decl (decl, 0);
4571 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4573 /* An automatic variable with an incomplete type: that is an error.
4574 Don't talk about array types here, since we took care of that
4575 message in grokdeclarator. */
4576 error ("storage size of %qD isn't known", decl);
4577 TREE_TYPE (decl) = error_mark_node;
4580 /* Keep this code around in case we later want to control debug info
4581 based on whether a type is "used". (jason 1999-11-11) */
4583 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4584 /* Let debugger know it should output info for this type. */
4585 note_debug_info_needed (ttype);
4587 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4588 note_debug_info_needed (DECL_CONTEXT (decl));
4591 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4592 && DECL_SIZE (decl) != NULL_TREE
4593 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4595 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4596 constant_expression_warning (DECL_SIZE (decl));
4599 error ("storage size of %qD isn't constant", decl);
4600 TREE_TYPE (decl) = error_mark_node;
4605 /* If a local static variable is declared in an inline function, or if
4606 we have a weak definition, we must endeavor to create only one
4607 instance of the variable at link-time. */
4610 maybe_commonize_var (tree decl)
4612 /* Static data in a function with comdat linkage also has comdat
4614 if (TREE_STATIC (decl)
4615 /* Don't mess with __FUNCTION__. */
4616 && ! DECL_ARTIFICIAL (decl)
4617 && DECL_FUNCTION_SCOPE_P (decl)
4618 && vague_linkage_fn_p (DECL_CONTEXT (decl)))
4622 /* With weak symbols, we simply make the variable COMDAT;
4623 that will cause copies in multiple translations units to
4625 comdat_linkage (decl);
4629 if (DECL_INITIAL (decl) == NULL_TREE
4630 || DECL_INITIAL (decl) == error_mark_node)
4632 /* Without weak symbols, we can use COMMON to merge
4633 uninitialized variables. */
4634 TREE_PUBLIC (decl) = 1;
4635 DECL_COMMON (decl) = 1;
4639 /* While for initialized variables, we must use internal
4640 linkage -- which means that multiple copies will not
4642 TREE_PUBLIC (decl) = 0;
4643 DECL_COMMON (decl) = 0;
4644 warning_at (input_location, 0,
4645 "sorry: semantics of inline function static "
4646 "data %q+#D are wrong (you'll wind up "
4647 "with multiple copies)", decl);
4648 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4649 " you can work around this by removing "
4654 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4655 /* Set it up again; we might have set DECL_INITIAL since the last
4657 comdat_linkage (decl);
4660 /* Issue an error message if DECL is an uninitialized const variable. */
4663 check_for_uninitialized_const_var (tree decl)
4665 tree type = TREE_TYPE (decl);
4667 /* ``Unless explicitly declared extern, a const object does not have
4668 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4670 if (TREE_CODE (decl) == VAR_DECL
4671 && TREE_CODE (type) != REFERENCE_TYPE
4672 && CP_TYPE_CONST_P (type)
4673 && !TYPE_NEEDS_CONSTRUCTING (type)
4674 && !DECL_INITIAL (decl))
4675 error ("uninitialized const %qD", decl);
4679 /* Structure holding the current initializer being processed by reshape_init.
4680 CUR is a pointer to the current element being processed, END is a pointer
4681 after the last element present in the initializer. */
4682 typedef struct reshape_iterator_t
4684 constructor_elt *cur;
4685 constructor_elt *end;
4688 static tree reshape_init_r (tree, reshape_iter *, bool);
4690 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4691 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4692 initialized. If there are no more such fields, the return value
4696 next_initializable_field (tree field)
4699 && (TREE_CODE (field) != FIELD_DECL
4700 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4701 || DECL_ARTIFICIAL (field)))
4702 field = TREE_CHAIN (field);
4707 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4708 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4709 INTEGER_CST representing the size of the array minus one (the maximum index),
4710 or NULL_TREE if the array was declared without specifying the size. D is
4711 the iterator within the constructor. */
4714 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4717 bool sized_array_p = (max_index != NULL_TREE);
4718 unsigned HOST_WIDE_INT max_index_cst = 0;
4719 unsigned HOST_WIDE_INT index;
4721 /* The initializer for an array is always a CONSTRUCTOR. */
4722 new_init = build_constructor (init_list_type_node, NULL);
4726 /* Minus 1 is used for zero sized arrays. */
4727 if (integer_all_onesp (max_index))
4730 if (host_integerp (max_index, 1))
4731 max_index_cst = tree_low_cst (max_index, 1);
4732 /* sizetype is sign extended, not zero extended. */
4734 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4738 /* Loop until there are no more initializers. */
4740 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4745 check_array_designated_initializer (d->cur);
4746 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4747 if (elt_init == error_mark_node)
4748 return error_mark_node;
4749 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4755 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4756 Parameters are the same of reshape_init_r. */
4759 reshape_init_array (tree type, reshape_iter *d)
4761 tree max_index = NULL_TREE;
4763 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4765 if (TYPE_DOMAIN (type))
4766 max_index = array_type_nelts (type);
4768 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4771 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4772 Parameters are the same of reshape_init_r. */
4775 reshape_init_vector (tree type, reshape_iter *d)
4777 tree max_index = NULL_TREE;
4780 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4782 if (COMPOUND_LITERAL_P (d->cur->value))
4784 tree value = d->cur->value;
4785 if (!same_type_p (TREE_TYPE (value), type))
4787 error ("invalid type %qT as initializer for a vector of type %qT",
4788 TREE_TYPE (d->cur->value), type);
4789 value = error_mark_node;
4795 /* For a vector, the representation type is a struct
4796 containing a single member which is an array of the
4797 appropriate size. */
4798 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4799 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4800 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4802 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4805 /* Subroutine of reshape_init_r, processes the initializers for classes
4806 or union. Parameters are the same of reshape_init_r. */
4809 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4814 gcc_assert (CLASS_TYPE_P (type));
4816 /* The initializer for a class is always a CONSTRUCTOR. */
4817 new_init = build_constructor (init_list_type_node, NULL);
4818 field = next_initializable_field (TYPE_FIELDS (type));
4824 An initializer for an aggregate member that is an
4825 empty class shall have the form of an empty
4826 initializer-list {}. */
4827 if (!first_initializer_p)
4829 error ("initializer for %qT must be brace-enclosed", type);
4830 return error_mark_node;
4835 /* Loop through the initializable fields, gathering initializers. */
4836 while (d->cur != d->end)
4840 /* Handle designated initializers, as an extension. */
4843 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4845 if (!field || TREE_CODE (field) != FIELD_DECL)
4847 error ("%qT has no non-static data member named %qD", type,
4849 return error_mark_node;
4853 /* If we processed all the member of the class, we are done. */
4857 field_init = reshape_init_r (TREE_TYPE (field), d,
4858 /*first_initializer_p=*/false);
4859 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4863 When a union is initialized with a brace-enclosed
4864 initializer, the braces shall only contain an
4865 initializer for the first member of the union. */
4866 if (TREE_CODE (type) == UNION_TYPE)
4869 field = next_initializable_field (TREE_CHAIN (field));
4875 /* Subroutine of reshape_init, which processes a single initializer (part of
4876 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4877 iterator within the CONSTRUCTOR which points to the initializer to process.
4878 FIRST_INITIALIZER_P is true if this is the first initializer of the
4879 outermost CONSTRUCTOR node. */
4882 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4884 tree init = d->cur->value;
4886 if (error_operand_p (init))
4887 return error_mark_node;
4889 /* A non-aggregate type is always initialized with a single
4891 if (!CP_AGGREGATE_TYPE_P (type))
4893 /* It is invalid to initialize a non-aggregate type with a
4894 brace-enclosed initializer before C++0x.
4895 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4896 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4897 a CONSTRUCTOR (with a record type). */
4898 if (TREE_CODE (init) == CONSTRUCTOR
4899 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4901 if (SCALAR_TYPE_P (type))
4903 error ("braces around scalar initializer for type %qT", type);
4904 init = error_mark_node;
4907 maybe_warn_cpp0x ("extended initializer lists");
4916 All implicit type conversions (clause _conv_) are considered when
4917 initializing the aggregate member with an initializer from an
4918 initializer-list. If the initializer can initialize a member,
4919 the member is initialized. Otherwise, if the member is itself a
4920 non-empty subaggregate, brace elision is assumed and the
4921 initializer is considered for the initialization of the first
4922 member of the subaggregate. */
4923 if (TREE_CODE (init) != CONSTRUCTOR
4924 /* But don't try this for the first initializer, since that would be
4925 looking through the outermost braces; A a2 = { a1 }; is not a
4926 valid aggregate initialization. */
4927 && !first_initializer_p
4928 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4934 /* [dcl.init.string]
4936 A char array (whether plain char, signed char, or unsigned char)
4937 can be initialized by a string-literal (optionally enclosed in
4938 braces); a wchar_t array can be initialized by a wide
4939 string-literal (optionally enclosed in braces). */
4940 if (TREE_CODE (type) == ARRAY_TYPE
4941 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4943 tree str_init = init;
4945 /* Strip one level of braces if and only if they enclose a single
4946 element (as allowed by [dcl.init.string]). */
4947 if (!first_initializer_p
4948 && TREE_CODE (str_init) == CONSTRUCTOR
4949 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4951 str_init = VEC_index (constructor_elt,
4952 CONSTRUCTOR_ELTS (str_init), 0)->value;
4955 /* If it's a string literal, then it's the initializer for the array
4956 as a whole. Otherwise, continue with normal initialization for
4957 array types (one value per array element). */
4958 if (TREE_CODE (str_init) == STRING_CST)
4965 /* The following cases are about aggregates. If we are not within a full
4966 initializer already, and there is not a CONSTRUCTOR, it means that there
4967 is a missing set of braces (that is, we are processing the case for
4968 which reshape_init exists). */
4969 if (!first_initializer_p)
4971 if (TREE_CODE (init) == CONSTRUCTOR)
4973 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4974 /* There is no need to reshape pointer-to-member function
4975 initializers, as they are always constructed correctly
4976 by the front end. */
4978 else if (COMPOUND_LITERAL_P (init))
4979 /* For a nested compound literal, there is no need to reshape since
4980 brace elision is not allowed. Even if we decided to allow it,
4981 we should add a call to reshape_init in finish_compound_literal,
4982 before calling digest_init, so changing this code would still
4983 not be necessary. */
4984 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4988 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4989 return reshape_init (type, init);
4993 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4997 /* Dispatch to specialized routines. */
4998 if (CLASS_TYPE_P (type))
4999 return reshape_init_class (type, d, first_initializer_p);
5000 else if (TREE_CODE (type) == ARRAY_TYPE)
5001 return reshape_init_array (type, d);
5002 else if (TREE_CODE (type) == VECTOR_TYPE)
5003 return reshape_init_vector (type, d);
5008 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5009 brace-enclosed aggregate initializer.
5011 INIT is the CONSTRUCTOR containing the list of initializers describing
5012 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5013 It may not presently match the shape of the TYPE; for example:
5015 struct S { int a; int b; };
5016 struct S a[] = { 1, 2, 3, 4 };
5018 Here INIT will hold a VEC of four elements, rather than a
5019 VEC of two elements, each itself a VEC of two elements. This
5020 routine transforms INIT from the former form into the latter. The
5021 revised CONSTRUCTOR node is returned. */
5024 reshape_init (tree type, tree init)
5026 VEC(constructor_elt, gc) *v;
5030 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5032 v = CONSTRUCTOR_ELTS (init);
5034 /* An empty constructor does not need reshaping, and it is always a valid
5036 if (VEC_empty (constructor_elt, v))
5039 /* Recurse on this CONSTRUCTOR. */
5040 d.cur = VEC_index (constructor_elt, v, 0);
5041 d.end = d.cur + VEC_length (constructor_elt, v);
5043 new_init = reshape_init_r (type, &d, true);
5044 if (new_init == error_mark_node)
5045 return error_mark_node;
5047 /* Make sure all the element of the constructor were used. Otherwise,
5048 issue an error about exceeding initializers. */
5050 error ("too many initializers for %qT", type);
5055 /* Verify array initializer. Returns true if errors have been reported. */
5058 check_array_initializer (tree decl, tree type, tree init)
5060 tree element_type = TREE_TYPE (type);
5062 /* The array type itself need not be complete, because the
5063 initializer may tell us how many elements are in the array.
5064 But, the elements of the array must be complete. */
5065 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5068 error ("elements of array %q#D have incomplete type", decl);
5070 error ("elements of array %q#T have incomplete type", type);
5073 /* It is not valid to initialize a VLA. */
5075 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5076 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5079 error ("variable-sized object %qD may not be initialized", decl);
5081 error ("variable-sized compound literal");
5087 /* Subroutine of check_initializer; args are passed down from that function.
5088 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5091 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5094 int saved_stmts_are_full_exprs_p = 0;
5095 if (building_stmt_tree ())
5097 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5098 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5100 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5101 if (building_stmt_tree ())
5102 current_stmt_tree ()->stmts_are_full_exprs_p =
5103 saved_stmts_are_full_exprs_p;
5107 /* Verify INIT (the initializer for DECL), and record the
5108 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5109 grok_reference_init.
5111 If the return value is non-NULL, it is an expression that must be
5112 evaluated dynamically to initialize DECL. */
5115 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5117 tree type = TREE_TYPE (decl);
5118 tree init_code = NULL;
5120 /* Things that are going to be initialized need to have complete
5122 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5124 if (type == error_mark_node)
5125 /* We will have already complained. */
5128 if (TREE_CODE (type) == ARRAY_TYPE)
5130 if (check_array_initializer (decl, type, init))
5133 else if (!COMPLETE_TYPE_P (type))
5135 error ("%qD has incomplete type", decl);
5136 TREE_TYPE (decl) = error_mark_node;
5140 /* There is no way to make a variable-sized class type in GNU C++. */
5141 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5143 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5145 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5146 if (SCALAR_TYPE_P (type))
5150 maybe_warn_cpp0x ("extended initializer lists");
5151 init = build_zero_init (type, NULL_TREE, false);
5153 else if (init_len != 1)
5155 error ("scalar object %qD requires one element in initializer",
5157 TREE_TYPE (decl) = error_mark_node;
5163 if (TREE_CODE (decl) == CONST_DECL)
5165 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5167 DECL_INITIAL (decl) = init;
5169 gcc_assert (init != NULL_TREE);
5172 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5173 init = grok_reference_init (decl, type, init, cleanup);
5176 /* Do not reshape constructors of vectors (they don't need to be
5178 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5180 if (is_std_init_list (type))
5181 return build_init_list_var_init (decl, type, init, cleanup);
5182 else if (TYPE_NON_AGGREGATE_CLASS (type))
5184 /* Don't reshape if the class has constructors. */
5185 if (cxx_dialect == cxx98)
5186 error ("in C++98 %qD must be initialized by constructor, "
5189 init = build_tree_list (NULL_TREE, init);
5191 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5193 error ("opaque vector types cannot be initialized");
5194 init = error_mark_node;
5197 init = reshape_init (type, init);
5200 /* If DECL has an array type without a specific bound, deduce the
5201 array size from the initializer. */
5202 maybe_deduce_size_from_array_init (decl, init);
5203 type = TREE_TYPE (decl);
5204 if (type == error_mark_node)
5207 if (TYPE_NEEDS_CONSTRUCTING (type)
5208 || (CLASS_TYPE_P (type)
5209 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5210 return build_aggr_init_full_exprs (decl, init, flags);
5211 else if (TREE_CODE (init) != TREE_VEC)
5213 init_code = store_init_value (decl, init, flags);
5214 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5215 && DECL_INITIAL (decl)
5216 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5217 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5218 warning (0, "array %qD initialized by parenthesized string literal %qE",
5219 decl, DECL_INITIAL (decl));
5223 else if (DECL_EXTERNAL (decl))
5225 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5226 return build_aggr_init_full_exprs (decl, init, flags);
5227 else if (MAYBE_CLASS_TYPE_P (type))
5229 tree core_type = strip_array_types (type);
5231 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5232 error ("structure %qD with uninitialized const members", decl);
5233 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5234 error ("structure %qD with uninitialized reference members", decl);
5236 check_for_uninitialized_const_var (decl);
5239 check_for_uninitialized_const_var (decl);
5241 if (init && init != error_mark_node)
5242 init_code = build2 (INIT_EXPR, type, decl, init);
5247 /* If DECL is not a local variable, give it RTL. */
5250 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5252 int toplev = toplevel_bindings_p ();
5254 const char *filename;
5256 /* Set the DECL_ASSEMBLER_NAME for the object. */
5259 /* The `register' keyword, when used together with an
5260 asm-specification, indicates that the variable should be
5261 placed in a particular register. */
5262 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5264 set_user_assembler_name (decl, asmspec);
5265 DECL_HARD_REGISTER (decl) = 1;
5269 if (TREE_CODE (decl) == FUNCTION_DECL
5270 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5271 set_builtin_user_assembler_name (decl, asmspec);
5272 set_user_assembler_name (decl, asmspec);
5276 /* Handle non-variables up front. */
5277 if (TREE_CODE (decl) != VAR_DECL)
5279 rest_of_decl_compilation (decl, toplev, at_eof);
5283 /* If we see a class member here, it should be a static data
5285 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5287 gcc_assert (TREE_STATIC (decl));
5288 /* An in-class declaration of a static data member should be
5289 external; it is only a declaration, and not a definition. */
5290 if (init == NULL_TREE)
5291 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5294 /* We don't create any RTL for local variables. */
5295 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5298 /* We defer emission of local statics until the corresponding
5299 DECL_EXPR is expanded. */
5300 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5302 /* We try to defer namespace-scope static constants so that they are
5303 not emitted into the object file unnecessarily. */
5304 filename = input_filename;
5305 if (!DECL_VIRTUAL_P (decl)
5306 && TREE_READONLY (decl)
5307 && DECL_INITIAL (decl) != NULL_TREE
5308 && DECL_INITIAL (decl) != error_mark_node
5310 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5312 && !TREE_PUBLIC (decl))
5314 /* Fool with the linkage of static consts according to #pragma
5316 struct c_fileinfo *finfo = get_fileinfo (filename);
5317 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5319 TREE_PUBLIC (decl) = 1;
5320 DECL_EXTERNAL (decl) = finfo->interface_only;
5325 /* Likewise for template instantiations. */
5326 else if (DECL_LANG_SPECIFIC (decl)
5327 && DECL_IMPLICIT_INSTANTIATION (decl))
5330 /* If we're not deferring, go ahead and assemble the variable. */
5332 rest_of_decl_compilation (decl, toplev, at_eof);
5335 /* walk_tree helper for wrap_temporary_cleanups, below. */
5338 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5340 if (TYPE_P (*stmt_p))
5346 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5348 tree guard = (tree)data;
5349 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5351 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5352 /* Tell honor_protect_cleanup_actions to handle this as a separate
5354 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5356 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5362 /* We're initializing a local variable which has a cleanup GUARD. If there
5363 are any temporaries used in the initializer INIT of this variable, we
5364 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5365 variable will be cleaned up properly if one of them throws.
5367 Unfortunately, there's no way to express this properly in terms of
5368 nesting, as the regions for the temporaries overlap the region for the
5369 variable itself; if there are two temporaries, the variable needs to be
5370 the first thing destroyed if either of them throws. However, we only
5371 want to run the variable's cleanup if it actually got constructed. So
5372 we need to guard the temporary cleanups with the variable's cleanup if
5373 they are run on the normal path, but not if they are run on the
5374 exceptional path. We implement this by telling
5375 honor_protect_cleanup_actions to strip the variable cleanup from the
5376 exceptional path. */
5379 wrap_temporary_cleanups (tree init, tree guard)
5381 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5384 /* Generate code to initialize DECL (a local variable). */
5387 initialize_local_var (tree decl, tree init)
5389 tree type = TREE_TYPE (decl);
5393 gcc_assert (TREE_CODE (decl) == VAR_DECL
5394 || TREE_CODE (decl) == RESULT_DECL);
5395 gcc_assert (!TREE_STATIC (decl));
5397 if (DECL_SIZE (decl) == NULL_TREE)
5399 /* If we used it already as memory, it must stay in memory. */
5400 DECL_INITIAL (decl) = NULL_TREE;
5401 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5405 if (type == error_mark_node)
5408 /* Compute and store the initial value. */
5409 already_used = TREE_USED (decl) || TREE_USED (type);
5411 /* Generate a cleanup, if necessary. */
5412 cleanup = cxx_maybe_build_cleanup (decl);
5414 /* Perform the initialization. */
5417 int saved_stmts_are_full_exprs_p;
5419 /* If we're only initializing a single object, guard the destructors
5420 of any temporaries used in its initializer with its destructor.
5421 This isn't right for arrays because each element initialization is
5422 a full-expression. */
5423 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5424 wrap_temporary_cleanups (init, cleanup);
5426 gcc_assert (building_stmt_tree ());
5427 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5428 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5429 finish_expr_stmt (init);
5430 current_stmt_tree ()->stmts_are_full_exprs_p =
5431 saved_stmts_are_full_exprs_p;
5434 /* Set this to 0 so we can tell whether an aggregate which was
5435 initialized was ever used. Don't do this if it has a
5436 destructor, so we don't complain about the 'resource
5437 allocation is initialization' idiom. Now set
5438 attribute((unused)) on types so decls of that type will be
5439 marked used. (see TREE_USED, above.) */
5440 if (TYPE_NEEDS_CONSTRUCTING (type)
5442 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5443 && DECL_NAME (decl))
5444 TREE_USED (decl) = 0;
5445 else if (already_used)
5446 TREE_USED (decl) = 1;
5449 finish_decl_cleanup (decl, cleanup);
5452 /* DECL is a VAR_DECL for a compiler-generated variable with static
5453 storage duration (like a virtual table) whose initializer is a
5454 compile-time constant. INIT must be either a TREE_LIST of values,
5455 or a CONSTRUCTOR. Initialize the variable and provide it to the
5459 initialize_artificial_var (tree decl, tree init)
5461 gcc_assert (DECL_ARTIFICIAL (decl));
5462 if (TREE_CODE (init) == TREE_LIST)
5463 init = build_constructor_from_list (TREE_TYPE (decl), init);
5464 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5465 DECL_INITIAL (decl) = init;
5466 DECL_INITIALIZED_P (decl) = 1;
5467 determine_visibility (decl);
5468 layout_var_decl (decl);
5469 maybe_commonize_var (decl);
5470 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5473 /* INIT is the initializer for a variable, as represented by the
5474 parser. Returns true iff INIT is value-dependent. */
5477 value_dependent_init_p (tree init)
5479 if (TREE_CODE (init) == TREE_LIST)
5480 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5481 return any_value_dependent_elements_p (init);
5482 else if (TREE_CODE (init) == CONSTRUCTOR)
5483 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5485 VEC(constructor_elt, gc) *elts;
5489 elts = CONSTRUCTOR_ELTS (init);
5490 nelts = VEC_length (constructor_elt, elts);
5491 for (i = 0; i < nelts; ++i)
5492 if (value_dependent_init_p (VEC_index (constructor_elt,
5497 /* It must be a simple expression, e.g., int i = 3; */
5498 return value_dependent_expression_p (init);
5503 /* Finish processing of a declaration;
5504 install its line number and initial value.
5505 If the length of an array type is not known before,
5506 it must be determined now, from the initial value, or it is an error.
5508 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5509 true, then INIT is an integral constant expression.
5511 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5512 if the (init) syntax was used. */
5515 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5516 tree asmspec_tree, int flags)
5520 const char *asmspec = NULL;
5521 int was_readonly = 0;
5522 bool var_definition_p = false;
5523 int saved_processing_template_decl;
5526 if (decl == error_mark_node)
5531 error ("assignment (not initialization) in declaration");
5535 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5536 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5537 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5539 type = TREE_TYPE (decl);
5540 if (type == error_mark_node)
5543 /* Assume no cleanup is required. */
5544 cleanup = NULL_TREE;
5545 saved_processing_template_decl = processing_template_decl;
5547 /* If a name was specified, get the string. */
5548 if (global_scope_p (current_binding_level))
5549 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5550 if (asmspec_tree && asmspec_tree != error_mark_node)
5551 asmspec = TREE_STRING_POINTER (asmspec_tree);
5553 if (current_class_type
5554 && CP_DECL_CONTEXT (decl) == current_class_type
5555 && TYPE_BEING_DEFINED (current_class_type)
5556 && (DECL_INITIAL (decl) || init))
5557 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5559 auto_node = type_uses_auto (type);
5562 if (init == NULL_TREE)
5564 error ("declaration of %q#D has no initializer", decl);
5565 TREE_TYPE (decl) = error_mark_node;
5568 if (TREE_CODE (init) == TREE_LIST)
5569 init = build_x_compound_expr_from_list (init, "initializer");
5570 if (describable_type (init))
5572 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5573 if (type == error_mark_node)
5578 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5580 if (init == ridpointers[(int)RID_DELETE])
5582 /* FIXME check this is 1st decl. */
5583 DECL_DELETED_FN (decl) = 1;
5584 DECL_DECLARED_INLINE_P (decl) = 1;
5585 DECL_INITIAL (decl) = error_mark_node;
5588 else if (init == ridpointers[(int)RID_DEFAULT])
5590 if (!defaultable_fn_p (decl))
5592 error ("%qD cannot be defaulted", decl);
5593 DECL_INITIAL (decl) = NULL_TREE;
5596 DECL_DEFAULTED_FN (decl) = 1;
5600 if (processing_template_decl)
5602 bool type_dependent_p;
5604 /* Add this declaration to the statement-tree. */
5605 if (at_function_scope_p ())
5606 add_decl_expr (decl);
5608 type_dependent_p = dependent_type_p (type);
5610 if (check_for_bare_parameter_packs (init))
5613 DECL_INITIAL (decl) = NULL_TREE;
5616 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5618 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5619 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5620 TREE_CONSTANT (decl) = 1;
5623 /* Generally, initializers in templates are expanded when the
5624 template is instantiated. But, if DECL is an integral
5625 constant static data member, then it can be used in future
5626 integral constant expressions, and its value must be
5629 && DECL_CLASS_SCOPE_P (decl)
5630 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5631 && !type_dependent_p
5632 && !value_dependent_init_p (init)))
5635 DECL_INITIAL (decl) = init;
5636 if (TREE_CODE (decl) == VAR_DECL
5637 && !DECL_PRETTY_FUNCTION_P (decl)
5638 && !type_dependent_p)
5639 maybe_deduce_size_from_array_init (decl, init);
5643 if (TREE_CODE (init) == TREE_LIST)
5645 /* If the parenthesized-initializer form was used (e.g.,
5646 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5647 arguments. (There is generally only one.) We convert them
5650 for (; list; list = TREE_CHAIN (list))
5652 tree elt = TREE_VALUE (list);
5653 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5657 init = fold_non_dependent_expr (init);
5658 processing_template_decl = 0;
5661 /* Take care of TYPE_DECLs up front. */
5662 if (TREE_CODE (decl) == TYPE_DECL)
5664 if (type != error_mark_node
5665 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5667 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5668 warning (0, "shadowing previous type declaration of %q#D", decl);
5669 set_identifier_type_value (DECL_NAME (decl), decl);
5672 /* If we have installed this as the canonical typedef for this
5673 type, and that type has not been defined yet, delay emitting
5674 the debug information for it, as we will emit it later. */
5675 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5676 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5677 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5679 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5684 /* A reference will be modified here, as it is initialized. */
5685 if (! DECL_EXTERNAL (decl)
5686 && TREE_READONLY (decl)
5687 && TREE_CODE (type) == REFERENCE_TYPE)
5690 TREE_READONLY (decl) = 0;
5693 if (TREE_CODE (decl) == VAR_DECL)
5695 /* Only variables with trivial initialization and destruction can
5696 have thread-local storage. */
5697 if (DECL_THREAD_LOCAL_P (decl)
5698 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5699 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5700 error ("%qD cannot be thread-local because it has non-trivial "
5701 "type %qT", decl, TREE_TYPE (decl));
5702 /* If this is a local variable that will need a mangled name,
5703 register it now. We must do this before processing the
5704 initializer for the variable, since the initialization might
5705 require a guard variable, and since the mangled name of the
5706 guard variable will depend on the mangled name of this
5708 if (DECL_FUNCTION_SCOPE_P (decl)
5709 && TREE_STATIC (decl)
5710 && !DECL_ARTIFICIAL (decl))
5711 push_local_name (decl);
5712 /* Convert the initializer to the type of DECL, if we have not
5713 already initialized DECL. */
5714 if (!DECL_INITIALIZED_P (decl)
5715 /* If !DECL_EXTERNAL then DECL is being defined. In the
5716 case of a static data member initialized inside the
5717 class-specifier, there can be an initializer even if DECL
5718 is *not* defined. */
5719 && (!DECL_EXTERNAL (decl) || init))
5721 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5724 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5725 /* Allow libjava/prims.cc define primitive classes. */
5726 if (init != NULL_TREE
5727 || jclass == NULL_TREE
5728 || TREE_CODE (jclass) != TYPE_DECL
5729 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5730 || !same_type_ignoring_top_level_qualifiers_p
5731 (type, TREE_TYPE (TREE_TYPE (jclass))))
5732 error ("Java object %qD not allocated with %<new%>", decl);
5737 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5738 if (init_const_expr_p)
5740 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5741 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5742 TREE_CONSTANT (decl) = 1;
5745 init = check_initializer (decl, init, flags, &cleanup);
5746 /* Thread-local storage cannot be dynamically initialized. */
5747 if (DECL_THREAD_LOCAL_P (decl) && init)
5749 error ("%qD is thread-local and so cannot be dynamically "
5750 "initialized", decl);
5754 /* Check that the initializer for a static data member was a
5755 constant. Although we check in the parser that the
5756 initializer is an integral constant expression, we do not
5757 simplify division-by-zero at the point at which it
5758 occurs. Therefore, in:
5760 struct S { static const int i = 7 / 0; };
5762 we issue an error at this point. It would
5763 probably be better to forbid division by zero in
5764 integral constant expressions. */
5765 if (DECL_EXTERNAL (decl) && init)
5767 error ("%qD cannot be initialized by a non-constant expression"
5768 " when being declared", decl);
5769 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5777 The memory occupied by any object of static storage
5778 duration is zero-initialized at program startup before
5779 any other initialization takes place.
5781 We cannot create an appropriate initializer until after
5782 the type of DECL is finalized. If DECL_INITIAL is set,
5783 then the DECL is statically initialized, and any
5784 necessary zero-initialization has already been performed. */
5785 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5786 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5787 /*nelts=*/NULL_TREE,
5788 /*static_storage_p=*/true);
5789 /* Remember that the initialization for this variable has
5791 DECL_INITIALIZED_P (decl) = 1;
5792 /* This declaration is the definition of this variable,
5793 unless we are initializing a static data member within
5794 the class specifier. */
5795 if (!DECL_EXTERNAL (decl))
5796 var_definition_p = true;
5798 /* If the variable has an array type, lay out the type, even if
5799 there is no initializer. It is valid to index through the
5800 array, and we must get TYPE_ALIGN set correctly on the array
5802 else if (TREE_CODE (type) == ARRAY_TYPE)
5805 else if (TREE_CODE (decl) == FIELD_DECL
5806 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5807 error ("non-static data member %qD has Java class type", decl);
5809 /* Add this declaration to the statement-tree. This needs to happen
5810 after the call to check_initializer so that the DECL_EXPR for a
5811 reference temp is added before the DECL_EXPR for the reference itself. */
5812 if (at_function_scope_p ())
5813 add_decl_expr (decl);
5815 /* Let the middle end know about variables and functions -- but not
5816 static data members in uninstantiated class templates. */
5817 if (!saved_processing_template_decl
5818 && (TREE_CODE (decl) == VAR_DECL
5819 || TREE_CODE (decl) == FUNCTION_DECL))
5821 if (TREE_CODE (decl) == VAR_DECL)
5823 layout_var_decl (decl);
5824 maybe_commonize_var (decl);
5827 /* This needs to happen after the linkage is set. */
5828 determine_visibility (decl);
5830 if (var_definition_p && TREE_STATIC (decl))
5832 /* If a TREE_READONLY variable needs initialization
5833 at runtime, it is no longer readonly and we need to
5834 avoid MEM_READONLY_P being set on RTL created for it. */
5837 if (TREE_READONLY (decl))
5838 TREE_READONLY (decl) = 0;
5841 else if (was_readonly)
5842 TREE_READONLY (decl) = 1;
5845 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5847 /* Check for abstractness of the type. Notice that there is no
5848 need to strip array types here since the check for those types
5849 is already done within create_array_type_for_decl. */
5850 if (TREE_CODE (type) == FUNCTION_TYPE
5851 || TREE_CODE (type) == METHOD_TYPE)
5852 abstract_virtuals_error (decl, TREE_TYPE (type));
5854 abstract_virtuals_error (decl, type);
5856 if (TREE_TYPE (decl) == error_mark_node)
5857 /* No initialization required. */
5859 else if (TREE_CODE (decl) == FUNCTION_DECL)
5863 if (init == ridpointers[(int)RID_DEFAULT])
5865 /* An out-of-class default definition is defined at
5866 the point where it is explicitly defaulted. */
5867 if (DECL_INITIAL (decl) == error_mark_node)
5868 synthesize_method (decl);
5871 error ("function %q#D is initialized like a variable", decl);
5873 /* else no initialization required. */
5875 else if (DECL_EXTERNAL (decl)
5876 && ! (DECL_LANG_SPECIFIC (decl)
5877 && DECL_NOT_REALLY_EXTERN (decl)))
5880 DECL_INITIAL (decl) = init;
5882 /* A variable definition. */
5883 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5884 /* Initialize the local variable. */
5885 initialize_local_var (decl, init);
5887 /* If a variable is defined, and then a subsequent
5888 definition with external linkage is encountered, we will
5889 get here twice for the same variable. We want to avoid
5890 calling expand_static_init more than once. For variables
5891 that are not static data members, we can call
5892 expand_static_init only when we actually process the
5893 initializer. It is not legal to redeclare a static data
5894 member, so this issue does not arise in that case. */
5895 else if (var_definition_p && TREE_STATIC (decl))
5896 expand_static_init (decl, init);
5899 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5900 reference, insert it in the statement-tree now. */
5902 push_cleanup (decl, cleanup, false);
5905 processing_template_decl = saved_processing_template_decl;
5908 TREE_READONLY (decl) = 1;
5910 /* If this was marked 'used', be sure it will be output. */
5911 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5912 mark_decl_referenced (decl);
5915 /* Returns a declaration for a VAR_DECL as if:
5917 extern "C" TYPE NAME;
5919 had been seen. Used to create compiler-generated global
5923 declare_global_var (tree name, tree type)
5927 push_to_top_level ();
5928 decl = build_decl (input_location, VAR_DECL, name, type);
5929 TREE_PUBLIC (decl) = 1;
5930 DECL_EXTERNAL (decl) = 1;
5931 DECL_ARTIFICIAL (decl) = 1;
5932 /* If the user has explicitly declared this variable (perhaps
5933 because the code we are compiling is part of a low-level runtime
5934 library), then it is possible that our declaration will be merged
5935 with theirs by pushdecl. */
5936 decl = pushdecl (decl);
5937 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
5938 pop_from_top_level ();
5943 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5944 if "__cxa_atexit" is not being used) corresponding to the function
5945 to be called when the program exits. */
5948 get_atexit_fn_ptr_type (void)
5953 if (!atexit_fn_ptr_type_node)
5955 if (flag_use_cxa_atexit
5956 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5957 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5958 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5960 /* The parameter to "atexit" is "void (*)(void)". */
5961 arg_types = void_list_node;
5963 fn_type = build_function_type (void_type_node, arg_types);
5964 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5967 return atexit_fn_ptr_type_node;
5970 /* Returns a pointer to the `atexit' function. Note that if
5971 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5972 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5975 get_atexit_node (void)
5982 bool use_aeabi_atexit;
5987 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5989 /* The declaration for `__cxa_atexit' is:
5991 int __cxa_atexit (void (*)(void *), void *, void *)
5993 We build up the argument types and then then function type
5996 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5997 /* First, build the pointer-to-function type for the first
5999 fn_ptr_type = get_atexit_fn_ptr_type ();
6000 /* Then, build the rest of the argument types. */
6001 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6002 if (use_aeabi_atexit)
6004 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6005 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6009 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6010 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6012 /* And the final __cxa_atexit type. */
6013 fn_type = build_function_type (integer_type_node, arg_types);
6014 fn_ptr_type = build_pointer_type (fn_type);
6015 if (use_aeabi_atexit)
6016 name = "__aeabi_atexit";
6018 name = "__cxa_atexit";
6022 /* The declaration for `atexit' is:
6024 int atexit (void (*)());
6026 We build up the argument types and then then function type
6028 fn_ptr_type = get_atexit_fn_ptr_type ();
6029 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
6030 /* Build the final atexit type. */
6031 fn_type = build_function_type (integer_type_node, arg_types);
6035 /* Now, build the function declaration. */
6036 push_lang_context (lang_name_c);
6037 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6038 mark_used (atexit_fndecl);
6039 pop_lang_context ();
6040 atexit_node = decay_conversion (atexit_fndecl);
6045 /* Returns the __dso_handle VAR_DECL. */
6048 get_dso_handle_node (void)
6050 if (dso_handle_node)
6051 return dso_handle_node;
6053 /* Declare the variable. */
6054 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6057 return dso_handle_node;
6060 /* Begin a new function with internal linkage whose job will be simply
6061 to destroy some particular variable. */
6063 static GTY(()) int start_cleanup_cnt;
6066 start_cleanup_fn (void)
6071 bool use_cxa_atexit = flag_use_cxa_atexit
6072 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6074 push_to_top_level ();
6076 /* No need to mangle this. */
6077 push_lang_context (lang_name_c);
6079 /* Build the name of the function. */
6080 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6081 /* Build the function declaration. */
6082 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6083 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6084 /* It's a function with internal linkage, generated by the
6086 TREE_PUBLIC (fndecl) = 0;
6087 DECL_ARTIFICIAL (fndecl) = 1;
6088 /* Make the function `inline' so that it is only emitted if it is
6089 actually needed. It is unlikely that it will be inlined, since
6090 it is only called via a function pointer, but we avoid unnecessary
6091 emissions this way. */
6092 DECL_DECLARED_INLINE_P (fndecl) = 1;
6093 DECL_INTERFACE_KNOWN (fndecl) = 1;
6094 /* Build the parameter. */
6099 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6100 DECL_CONTEXT (parmdecl) = fndecl;
6101 TREE_USED (parmdecl) = 1;
6102 DECL_ARGUMENTS (fndecl) = parmdecl;
6106 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6108 pop_lang_context ();
6110 return current_function_decl;
6113 /* Finish the cleanup function begun by start_cleanup_fn. */
6116 end_cleanup_fn (void)
6118 expand_or_defer_fn (finish_function (0));
6120 pop_from_top_level ();
6123 /* Generate code to handle the destruction of DECL, an object with
6124 static storage duration. */
6127 register_dtor_fn (tree decl)
6136 type = TREE_TYPE (decl);
6137 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6138 return void_zero_node;
6140 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6141 a class object, we can just pass the destructor to
6142 "__cxa_atexit"; we don't have to build a temporary function to do
6144 use_dtor = (flag_use_cxa_atexit
6145 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6146 && CLASS_TYPE_P (type));
6151 /* Find the destructor. */
6152 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6153 gcc_assert (idx >= 0);
6154 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6155 /* Make sure it is accessible. */
6156 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6160 /* Call build_cleanup before we enter the anonymous function so
6161 that any access checks will be done relative to the current
6162 scope, rather than the scope of the anonymous function. */
6163 build_cleanup (decl);
6165 /* Now start the function. */
6166 cleanup = start_cleanup_fn ();
6168 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6169 to the original function, rather than the anonymous one. That
6170 will make the back end think that nested functions are in use,
6171 which causes confusion. */
6172 push_deferring_access_checks (dk_no_check);
6173 fcall = build_cleanup (decl);
6174 pop_deferring_access_checks ();
6176 /* Create the body of the anonymous function. */
6177 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6178 finish_expr_stmt (fcall);
6179 finish_compound_stmt (compound_stmt);
6183 /* Call atexit with the cleanup function. */
6184 mark_used (cleanup);
6185 cleanup = build_address (cleanup);
6186 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6192 /* We must convert CLEANUP to the type that "__cxa_atexit"
6194 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6195 /* "__cxa_atexit" will pass the address of DECL to the
6196 cleanup function. */
6198 addr = build_address (decl);
6199 /* The declared type of the parameter to "__cxa_atexit" is
6200 "void *". For plain "T*", we could just let the
6201 machinery in cp_build_function_call convert it -- but if the
6202 type is "cv-qualified T *", then we need to convert it
6203 before passing it in, to avoid spurious errors. */
6204 addr = build_nop (ptr_type_node, addr);
6207 /* Since the cleanup functions we build ignore the address
6208 they're given, there's no reason to pass the actual address
6209 in, and, in general, it's cheaper to pass NULL than any
6211 addr = null_pointer_node;
6212 args = tree_cons (NULL_TREE,
6213 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6214 tf_warning_or_error),
6216 if (targetm.cxx.use_aeabi_atexit ())
6218 args = tree_cons (NULL_TREE, cleanup, args);
6219 args = tree_cons (NULL_TREE, addr, args);
6223 args = tree_cons (NULL_TREE, addr, args);
6224 args = tree_cons (NULL_TREE, cleanup, args);
6228 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6229 return cp_build_function_call (get_atexit_node (), args,
6230 tf_warning_or_error);
6233 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6234 is its initializer. Generate code to handle the construction
6235 and destruction of DECL. */
6238 expand_static_init (tree decl, tree init)
6240 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6241 gcc_assert (TREE_STATIC (decl));
6243 /* Some variables require no initialization. */
6245 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6246 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6249 if (DECL_FUNCTION_SCOPE_P (decl))
6251 /* Emit code to perform this initialization but once. */
6252 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6253 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6254 tree guard, guard_addr;
6255 tree acquire_fn, release_fn, abort_fn;
6258 /* Emit code to perform this initialization but once. This code
6261 static <type> guard;
6262 if (!guard.first_byte) {
6263 if (__cxa_guard_acquire (&guard)) {
6266 // Do initialization.
6267 flag = true; __cxa_guard_release (&guard);
6268 // Register variable for destruction at end of program.
6270 if (!flag) __cxa_guard_abort (&guard);
6274 Note that the `flag' variable is only set to 1 *after* the
6275 initialization is complete. This ensures that an exception,
6276 thrown during the construction, will cause the variable to
6277 reinitialized when we pass through this code again, as per:
6281 If the initialization exits by throwing an exception, the
6282 initialization is not complete, so it will be tried again
6283 the next time control enters the declaration.
6285 This process should be thread-safe, too; multiple threads
6286 should not be able to initialize the variable more than
6289 /* Create the guard variable. */
6290 guard = get_guard (decl);
6292 /* This optimization isn't safe on targets with relaxed memory
6293 consistency. On such targets we force synchronization in
6294 __cxa_guard_acquire. */
6295 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6297 /* Begin the conditional initialization. */
6298 if_stmt = begin_if_stmt ();
6299 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6300 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6303 if (flag_threadsafe_statics)
6305 guard_addr = build_address (guard);
6307 acquire_fn = get_identifier ("__cxa_guard_acquire");
6308 release_fn = get_identifier ("__cxa_guard_release");
6309 abort_fn = get_identifier ("__cxa_guard_abort");
6310 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6312 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6314 tree vfntype = build_function_type (void_type_node, argtypes);
6315 acquire_fn = push_library_fn
6316 (acquire_fn, build_function_type (integer_type_node, argtypes),
6318 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6319 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6323 release_fn = identifier_global_value (release_fn);
6324 abort_fn = identifier_global_value (abort_fn);
6327 inner_if_stmt = begin_if_stmt ();
6328 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6331 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6332 begin = get_target_expr (boolean_false_node);
6333 flag = TARGET_EXPR_SLOT (begin);
6335 TARGET_EXPR_CLEANUP (begin)
6336 = build3 (COND_EXPR, void_type_node, flag,
6338 build_call_n (abort_fn, 1, guard_addr));
6339 CLEANUP_EH_ONLY (begin) = 1;
6341 /* Do the initialization itself. */
6342 init = add_stmt_to_compound (begin, init);
6343 init = add_stmt_to_compound
6344 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6345 init = add_stmt_to_compound
6346 (init, build_call_n (release_fn, 1, guard_addr));
6349 init = add_stmt_to_compound (init, set_guard (guard));
6351 /* Use atexit to register a function for destroying this static
6353 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6355 finish_expr_stmt (init);
6357 if (flag_threadsafe_statics)
6359 finish_compound_stmt (inner_then_clause);
6360 finish_then_clause (inner_if_stmt);
6361 finish_if_stmt (inner_if_stmt);
6364 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6366 finish_compound_stmt (then_clause);
6367 finish_then_clause (if_stmt);
6368 finish_if_stmt (if_stmt);
6372 static_aggregates = tree_cons (init, decl, static_aggregates);
6376 /* Make TYPE a complete type based on INITIAL_VALUE.
6377 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6378 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6379 3 if the initializer list is empty (in pedantic mode). */
6382 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6385 tree type, elt_type;
6389 unsigned HOST_WIDE_INT i;
6392 /* An array of character type can be initialized from a
6393 brace-enclosed string constant.
6395 FIXME: this code is duplicated from reshape_init. Probably
6396 we should just call reshape_init here? */
6397 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6398 && TREE_CODE (initial_value) == CONSTRUCTOR
6399 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6401 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6402 tree value = VEC_index (constructor_elt, v, 0)->value;
6404 if (TREE_CODE (value) == STRING_CST
6405 && VEC_length (constructor_elt, v) == 1)
6406 initial_value = value;
6409 /* If any of the elements are parameter packs, we can't actually
6410 complete this type now because the array size is dependent. */
6411 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6413 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6416 if (PACK_EXPANSION_P (value))
6422 failure = complete_array_type (ptype, initial_value, do_default);
6424 /* We can create the array before the element type is complete, which
6425 means that we didn't have these two bits set in the original type
6426 either. In completing the type, we are expected to propagate these
6427 bits. See also complete_type which does the same thing for arrays
6430 if (TYPE_DOMAIN (type))
6432 elt_type = TREE_TYPE (type);
6433 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6434 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6435 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6441 /* Return zero if something is declared to be a member of type
6442 CTYPE when in the context of CUR_TYPE. STRING is the error
6443 message to print in that case. Otherwise, quietly return 1. */
6446 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6448 if (ctype && ctype != cur_type)
6450 if (flags == DTOR_FLAG)
6451 error ("destructor for alien class %qT cannot be a member", ctype);
6453 error ("constructor for alien class %qT cannot be a member", ctype);
6459 /* Subroutine of `grokdeclarator'. */
6461 /* Generate errors possibly applicable for a given set of specifiers.
6462 This is for ARM $7.1.2. */
6465 bad_specifiers (tree object,
6474 error ("%qD declared as a %<virtual%> %s", object, type);
6476 error ("%qD declared as an %<inline%> %s", object, type);
6478 error ("%<const%> and %<volatile%> function specifiers on "
6479 "%qD invalid in %s declaration",
6482 error ("%q+D declared as a friend", object);
6484 && (TREE_CODE (object) == TYPE_DECL
6485 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6486 && !TYPE_REFFN_P (TREE_TYPE (object))
6487 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6488 error ("%q+D declared with an exception specification", object);
6491 /* DECL is a member function or static data member and is presently
6492 being defined. Check that the definition is taking place in a
6496 check_class_member_definition_namespace (tree decl)
6498 /* These checks only apply to member functions and static data
6500 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6501 || TREE_CODE (decl) == VAR_DECL);
6502 /* We check for problems with specializations in pt.c in
6503 check_specialization_namespace, where we can issue better
6505 if (processing_specialization)
6507 /* There are no restrictions on the placement of
6508 explicit instantiations. */
6509 if (processing_explicit_instantiation)
6513 A member function definition that appears outside of the
6514 class definition shall appear in a namespace scope enclosing
6515 the class definition.
6519 The definition for a static data member shall appear in a
6520 namespace scope enclosing the member's class definition. */
6521 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6522 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6523 decl, DECL_CONTEXT (decl));
6526 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6527 METHOD_TYPE for a non-static member function; QUALS are the
6528 cv-qualifiers that apply to the function. */
6531 build_this_parm (tree type, cp_cv_quals quals)
6536 cp_cv_quals this_quals;
6538 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6539 /* The `this' parameter is implicitly `const'; it cannot be
6541 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6542 qual_type = cp_build_qualified_type (this_type, this_quals);
6543 parm = build_artificial_parm (this_identifier, qual_type);
6544 cp_apply_type_quals_to_decl (this_quals, parm);
6548 /* CTYPE is class type, or null if non-class.
6549 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6551 DECLARATOR is the function's name.
6552 PARMS is a chain of PARM_DECLs for the function.
6553 VIRTUALP is truthvalue of whether the function is virtual or not.
6554 FLAGS are to be passed through to `grokclassfn'.
6555 QUALS are qualifiers indicating whether the function is `const'
6557 RAISES is a list of exceptions that this function can raise.
6558 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6559 not look, and -1 if we should not call `grokclassfn' at all.
6561 SFK is the kind of special function (if any) for the new function.
6563 Returns `NULL_TREE' if something goes wrong, after issuing
6564 applicable error messages. */
6567 grokfndecl (tree ctype,
6571 tree orig_declarator,
6573 enum overload_flags flags,
6580 special_function_kind sfk,
6585 location_t location)
6588 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6592 type = build_exception_variant (type, raises);
6594 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6596 /* If we have an explicit location, use it, otherwise use whatever
6597 build_lang_decl used (probably input_location). */
6598 if (location != UNKNOWN_LOCATION)
6599 DECL_SOURCE_LOCATION (decl) = location;
6601 if (TREE_CODE (type) == METHOD_TYPE)
6604 parm = build_this_parm (type, quals);
6605 TREE_CHAIN (parm) = parms;
6608 DECL_ARGUMENTS (decl) = parms;
6609 for (t = parms; t; t = TREE_CHAIN (t))
6610 DECL_CONTEXT (t) = decl;
6611 /* Propagate volatile out from type to decl. */
6612 if (TYPE_VOLATILE (type))
6613 TREE_THIS_VOLATILE (decl) = 1;
6615 /* Setup decl according to sfk. */
6618 case sfk_constructor:
6619 case sfk_copy_constructor:
6620 DECL_CONSTRUCTOR_P (decl) = 1;
6622 case sfk_destructor:
6623 DECL_DESTRUCTOR_P (decl) = 1;
6629 /* If pointers to member functions use the least significant bit to
6630 indicate whether a function is virtual, ensure a pointer
6631 to this function will have that bit clear. */
6632 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6633 && TREE_CODE (type) == METHOD_TYPE
6634 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6635 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6638 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6642 ("defining explicit specialization %qD in friend declaration",
6646 tree fns = TREE_OPERAND (orig_declarator, 0);
6647 tree args = TREE_OPERAND (orig_declarator, 1);
6649 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6651 /* Something like `template <class T> friend void f<T>()'. */
6652 error ("invalid use of template-id %qD in declaration "
6653 "of primary template",
6659 /* A friend declaration of the form friend void f<>(). Record
6660 the information in the TEMPLATE_ID_EXPR. */
6661 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6663 if (TREE_CODE (fns) == COMPONENT_REF)
6665 /* Due to bison parser ickiness, we will have already looked
6666 up an operator_name or PFUNCNAME within the current class
6667 (see template_id in parse.y). If the current class contains
6668 such a name, we'll get a COMPONENT_REF here. Undo that. */
6670 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6671 == current_class_type);
6672 fns = TREE_OPERAND (fns, 1);
6674 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6675 || TREE_CODE (fns) == OVERLOAD);
6676 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6678 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6679 if (TREE_PURPOSE (t)
6680 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6682 error ("default arguments are not allowed in declaration "
6683 "of friend template specialization %qD",
6690 error ("%<inline%> is not allowed in declaration of friend "
6691 "template specialization %qD",
6698 /* If this decl has namespace scope, set that up. */
6700 set_decl_namespace (decl, in_namespace, friendp);
6702 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6704 /* `main' and builtins have implicit 'C' linkage. */
6705 if ((MAIN_NAME_P (declarator)
6706 || (IDENTIFIER_LENGTH (declarator) > 10
6707 && IDENTIFIER_POINTER (declarator)[0] == '_'
6708 && IDENTIFIER_POINTER (declarator)[1] == '_'
6709 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6710 && current_lang_name == lang_name_cplusplus
6711 && ctype == NULL_TREE
6712 /* NULL_TREE means global namespace. */
6713 && DECL_CONTEXT (decl) == NULL_TREE)
6714 SET_DECL_LANGUAGE (decl, lang_c);
6716 /* Should probably propagate const out from type to decl I bet (mrs). */
6719 DECL_STATIC_FUNCTION_P (decl) = 1;
6720 DECL_CONTEXT (decl) = ctype;
6725 DECL_CONTEXT (decl) = ctype;
6727 check_class_member_definition_namespace (decl);
6730 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6732 if (processing_template_decl)
6733 error ("cannot declare %<::main%> to be a template");
6735 error ("cannot declare %<::main%> to be inline");
6737 error ("cannot declare %<::main%> to be static");
6742 /* Members of anonymous types and local classes have no linkage; make
6743 them internal. If a typedef is made later, this will be changed. */
6744 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6745 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6748 TREE_PUBLIC (decl) = publicp;
6751 DECL_INTERFACE_KNOWN (decl) = 1;
6752 DECL_NOT_REALLY_EXTERN (decl) = 1;
6755 /* If the declaration was declared inline, mark it as such. */
6757 DECL_DECLARED_INLINE_P (decl) = 1;
6759 DECL_EXTERNAL (decl) = 1;
6760 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6763 ? G_("static member function %qD cannot have cv-qualifier")
6764 : G_("non-member function %qD cannot have cv-qualifier"),
6766 quals = TYPE_UNQUALIFIED;
6769 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6770 && !grok_op_properties (decl, /*complain=*/true))
6773 if (ctype && decl_function_context (decl))
6774 DECL_NO_STATIC_CHAIN (decl) = 1;
6777 /* Make the init_value nonzero so pushdecl knows this is not
6778 tentative. error_mark_node is replaced later with the BLOCK. */
6779 DECL_INITIAL (decl) = error_mark_node;
6781 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6782 TREE_NOTHROW (decl) = 1;
6784 /* Caller will do the rest of this. */
6788 if (ctype != NULL_TREE)
6789 grokclassfn (ctype, decl, flags);
6791 decl = check_explicit_specialization (orig_declarator, decl,
6794 4 * (friendp != 0));
6795 if (decl == error_mark_node)
6800 cplus_decl_attributes (&decl, *attrlist, 0);
6801 *attrlist = NULL_TREE;
6804 /* Check main's type after attributes have been applied. */
6805 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6807 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6810 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6812 error ("%<::main%> must return %<int%>");
6813 newtype = build_function_type (integer_type_node, oldtypeargs);
6814 TREE_TYPE (decl) = newtype;
6817 check_main_parameter_types (decl);
6820 if (ctype != NULL_TREE
6821 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6824 tree old_decl = check_classfn (ctype, decl,
6825 (processing_template_decl
6826 > template_class_depth (ctype))
6827 ? current_template_parms
6830 if (old_decl == error_mark_node)
6838 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6839 /* Because grokfndecl is always supposed to return a
6840 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6841 here. We depend on our callers to figure out that its
6842 really a template that's being returned. */
6843 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6845 if (DECL_STATIC_FUNCTION_P (old_decl)
6846 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6847 /* Remove the `this' parm added by grokclassfn.
6848 XXX Isn't this done in start_function, too? */
6849 revert_static_member_fn (decl);
6850 if (DECL_ARTIFICIAL (old_decl))
6852 error ("definition of implicitly-declared %qD", old_decl);
6856 /* Since we've smashed OLD_DECL to its
6857 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6858 if (TREE_CODE (decl) == TEMPLATE_DECL)
6859 decl = DECL_TEMPLATE_RESULT (decl);
6861 /* Attempt to merge the declarations. This can fail, in
6862 the case of some invalid specialization declarations. */
6863 pushed_scope = push_scope (ctype);
6864 ok = duplicate_decls (decl, old_decl, friendp);
6866 pop_scope (pushed_scope);
6869 error ("no %q#D member function declared in class %qT",
6877 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6880 if (ctype == NULL_TREE || check)
6884 DECL_VIRTUAL_P (decl) = 1;
6889 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6890 the linkage that DECL will receive in the object file. */
6893 set_linkage_for_static_data_member (tree decl)
6895 /* A static data member always has static storage duration and
6896 external linkage. Note that static data members are forbidden in
6897 local classes -- the only situation in which a class has
6898 non-external linkage. */
6899 TREE_PUBLIC (decl) = 1;
6900 TREE_STATIC (decl) = 1;
6901 /* For non-template classes, static data members are always put
6902 out in exactly those files where they are defined, just as
6903 with ordinary namespace-scope variables. */
6904 if (!processing_template_decl)
6905 DECL_INTERFACE_KNOWN (decl) = 1;
6908 /* Create a VAR_DECL named NAME with the indicated TYPE.
6910 If SCOPE is non-NULL, it is the class type or namespace containing
6911 the variable. If SCOPE is NULL, the variable should is created in
6912 the innermost enclosings scope. */
6915 grokvardecl (tree type,
6917 const cp_decl_specifier_seq *declspecs,
6923 tree explicit_scope;
6925 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6927 /* Compute the scope in which to place the variable, but remember
6928 whether or not that scope was explicitly specified by the user. */
6929 explicit_scope = scope;
6932 /* An explicit "extern" specifier indicates a namespace-scope
6934 if (declspecs->storage_class == sc_extern)
6935 scope = current_namespace;
6936 else if (!at_function_scope_p ())
6937 scope = current_scope ();
6941 && (/* If the variable is a namespace-scope variable declared in a
6942 template, we need DECL_LANG_SPECIFIC. */
6943 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6944 /* Similarly for namespace-scope variables with language linkage
6946 || (TREE_CODE (scope) == NAMESPACE_DECL
6947 && current_lang_name != lang_name_cplusplus)
6948 /* Similarly for static data members. */
6950 decl = build_lang_decl (VAR_DECL, name, type);
6952 decl = build_decl (input_location, VAR_DECL, name, type);
6954 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6955 set_decl_namespace (decl, explicit_scope, 0);
6957 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6959 if (declspecs->storage_class == sc_extern)
6961 DECL_THIS_EXTERN (decl) = 1;
6962 DECL_EXTERNAL (decl) = !initialized;
6965 if (DECL_CLASS_SCOPE_P (decl))
6967 set_linkage_for_static_data_member (decl);
6968 /* This function is only called with out-of-class definitions. */
6969 DECL_EXTERNAL (decl) = 0;
6970 check_class_member_definition_namespace (decl);
6972 /* At top level, either `static' or no s.c. makes a definition
6973 (perhaps tentative), and absence of `static' makes it public. */
6974 else if (toplevel_bindings_p ())
6976 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6977 && (DECL_THIS_EXTERN (decl) || ! constp));
6978 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6980 /* Not at top level, only `static' makes a static definition. */
6983 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6984 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6987 if (declspecs->specs[(int)ds_thread])
6988 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6990 if (TREE_PUBLIC (decl))
6992 /* If the type of the decl has no linkage, make sure that we'll
6993 notice that in mark_used. */
6994 if (DECL_LANG_SPECIFIC (decl) == NULL
6995 && TREE_PUBLIC (decl)
6996 && !DECL_EXTERN_C_P (decl)
6997 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
6998 retrofit_lang_decl (decl);
7001 DECL_INTERFACE_KNOWN (decl) = 1;
7006 /* Create and return a canonical pointer to member function type, for
7007 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7010 build_ptrmemfunc_type (tree type)
7014 tree unqualified_variant = NULL_TREE;
7016 if (type == error_mark_node)
7019 /* If a canonical type already exists for this type, use it. We use
7020 this method instead of type_hash_canon, because it only does a
7021 simple equality check on the list of field members. */
7023 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7026 /* Make sure that we always have the unqualified pointer-to-member
7028 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7030 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7032 t = make_class_type (RECORD_TYPE);
7033 xref_basetypes (t, NULL_TREE);
7035 /* Let the front end know this is a pointer to member function... */
7036 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7037 /* ... and not really a class type. */
7038 SET_CLASS_TYPE_P (t, 0);
7040 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7043 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7045 TREE_CHAIN (field) = fields;
7048 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7050 /* Zap out the name so that the back end will give us the debugging
7051 information for this anonymous RECORD_TYPE. */
7052 TYPE_NAME (t) = NULL_TREE;
7054 /* If this is not the unqualified form of this pointer-to-member
7055 type, set the TYPE_MAIN_VARIANT for this type to be the
7056 unqualified type. Since they are actually RECORD_TYPEs that are
7057 not variants of each other, we must do this manually.
7058 As we just built a new type there is no need to do yet another copy. */
7059 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7061 int type_quals = cp_type_quals (type);
7062 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7063 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7064 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7065 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7066 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7067 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7068 TREE_TYPE (TYPE_BINFO (t)) = t;
7071 /* Cache this pointer-to-member type so that we can find it again
7073 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7075 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7076 SET_TYPE_STRUCTURAL_EQUALITY (t);
7077 else if (TYPE_CANONICAL (type) != type)
7078 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7083 /* Create and return a pointer to data member type. */
7086 build_ptrmem_type (tree class_type, tree member_type)
7088 if (TREE_CODE (member_type) == METHOD_TYPE)
7092 arg_types = TYPE_ARG_TYPES (member_type);
7093 class_type = (cp_build_qualified_type
7095 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7097 = build_method_type_directly (class_type,
7098 TREE_TYPE (member_type),
7099 TREE_CHAIN (arg_types));
7100 return build_ptrmemfunc_type (build_pointer_type (member_type));
7104 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7105 return build_offset_type (class_type, member_type);
7109 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7110 Check to see that the definition is valid. Issue appropriate error
7111 messages. Return 1 if the definition is particularly bad, or 0
7115 check_static_variable_definition (tree decl, tree type)
7117 /* Motion 10 at San Diego: If a static const integral data member is
7118 initialized with an integral constant expression, the initializer
7119 may appear either in the declaration (within the class), or in
7120 the definition, but not both. If it appears in the class, the
7121 member is a member constant. The file-scope definition is always
7123 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7125 error ("invalid in-class initialization of static data member "
7126 "of non-integral type %qT",
7128 /* If we just return the declaration, crashes will sometimes
7129 occur. We therefore return void_type_node, as if this were a
7130 friend declaration, to cause callers to completely ignore
7131 this declaration. */
7134 else if (!CP_TYPE_CONST_P (type))
7135 error ("ISO C++ forbids in-class initialization of non-const "
7136 "static member %qD",
7138 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7139 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7140 "%qD of non-integral type %qT", decl, type);
7145 /* Given the SIZE (i.e., number of elements) in an array, compute an
7146 appropriate index type for the array. If non-NULL, NAME is the
7147 name of the thing being declared. */
7150 compute_array_index_type (tree name, tree size)
7154 tree abi_1_itype = NULL_TREE;
7156 if (error_operand_p (size))
7157 return error_mark_node;
7159 type = TREE_TYPE (size);
7160 /* The array bound must be an integer type. */
7161 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7164 error ("size of array %qD has non-integral type %qT", name, type);
7166 error ("size of array has non-integral type %qT", type);
7167 size = integer_one_node;
7168 type = TREE_TYPE (size);
7171 /* We can only call value_dependent_expression_p on integral constant
7172 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7173 set if this isn't one. */
7174 if (processing_template_decl
7175 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7177 /* We cannot do any checking for a SIZE that isn't known to be
7178 constant. Just build the index type and mark that it requires
7179 structural equality checks. */
7180 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7181 size, integer_one_node));
7182 if (!TREE_SIDE_EFFECTS (size))
7184 TYPE_DEPENDENT_P (itype) = 1;
7185 TYPE_DEPENDENT_P_VALID (itype) = 1;
7187 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7191 if (!abi_version_at_least (2) && processing_template_decl)
7192 /* For abi-1, we handled all instances in templates the same way,
7193 even when they were non-dependent. This affects the manglings
7194 produced. So, we do the normal checking for non-dependent
7195 sizes, but at the end we'll return the same type that abi-1
7196 would have, but with TYPE_CANONICAL set to the "right"
7197 value that the current ABI would provide. */
7198 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7199 size, integer_one_node));
7201 /* The size might be the result of a cast. */
7202 STRIP_TYPE_NOPS (size);
7204 /* It might be a const variable or enumeration constant. */
7205 size = integral_constant_value (size);
7207 /* Normally, the array-bound will be a constant. */
7208 if (TREE_CODE (size) == INTEGER_CST)
7210 /* Check to see if the array bound overflowed. Make that an
7211 error, no matter how generous we're being. */
7212 constant_expression_error (size);
7214 /* An array must have a positive number of elements. */
7215 if (INT_CST_LT (size, integer_zero_node))
7218 error ("size of array %qD is negative", name);
7220 error ("size of array is negative");
7221 size = integer_one_node;
7223 /* As an extension we allow zero-sized arrays. We always allow
7224 them in system headers because glibc uses them. */
7225 else if (integer_zerop (size) && !in_system_header)
7228 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7230 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7233 else if (TREE_CONSTANT (size))
7235 /* `(int) &fn' is not a valid array bound. */
7237 error ("size of array %qD is not an integral constant-expression",
7240 error ("size of array is not an integral constant-expression");
7241 size = integer_one_node;
7243 else if (pedantic && warn_vla != 0)
7246 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7248 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7250 else if (warn_vla > 0)
7254 "variable length array %qD is used", name);
7257 "variable length array is used");
7260 if (processing_template_decl && !TREE_CONSTANT (size))
7261 /* A variable sized array. */
7262 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7265 HOST_WIDE_INT saved_processing_template_decl;
7267 /* Compute the index of the largest element in the array. It is
7268 one less than the number of elements in the array. We save
7269 and restore PROCESSING_TEMPLATE_DECL so that computations in
7270 cp_build_binary_op will be appropriately folded. */
7271 saved_processing_template_decl = processing_template_decl;
7272 processing_template_decl = 0;
7273 itype = cp_build_binary_op (input_location,
7275 cp_convert (ssizetype, size),
7276 cp_convert (ssizetype, integer_one_node),
7277 tf_warning_or_error);
7278 itype = fold (itype);
7279 processing_template_decl = saved_processing_template_decl;
7281 if (!TREE_CONSTANT (itype))
7282 /* A variable sized array. */
7283 itype = variable_size (itype);
7284 /* Make sure that there was no overflow when creating to a signed
7285 index type. (For example, on a 32-bit machine, an array with
7286 size 2^32 - 1 is too big.) */
7287 else if (TREE_CODE (itype) == INTEGER_CST
7288 && TREE_OVERFLOW (itype))
7290 error ("overflow in array dimension");
7291 TREE_OVERFLOW (itype) = 0;
7295 /* Create and return the appropriate index type. */
7298 tree t = build_index_type (itype);
7299 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7303 return build_index_type (itype);
7306 /* Returns the scope (if any) in which the entity declared by
7307 DECLARATOR will be located. If the entity was declared with an
7308 unqualified name, NULL_TREE is returned. */
7311 get_scope_of_declarator (const cp_declarator *declarator)
7313 while (declarator && declarator->kind != cdk_id)
7314 declarator = declarator->declarator;
7316 /* If the declarator-id is a SCOPE_REF, the scope in which the
7317 declaration occurs is the first operand. */
7319 && declarator->u.id.qualifying_scope)
7320 return declarator->u.id.qualifying_scope;
7322 /* Otherwise, the declarator is not a qualified name; the entity will
7323 be declared in the current scope. */
7327 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7328 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7332 create_array_type_for_decl (tree name, tree type, tree size)
7334 tree itype = NULL_TREE;
7335 const char* error_msg;
7337 /* If things have already gone awry, bail now. */
7338 if (type == error_mark_node || size == error_mark_node)
7339 return error_mark_node;
7341 /* Assume that everything will go OK. */
7344 /* There are some types which cannot be array elements. */
7345 switch (TREE_CODE (type))
7348 error_msg = "array of void";
7352 error_msg = "array of functions";
7355 case REFERENCE_TYPE:
7356 error_msg = "array of references";
7360 error_msg = "array of function members";
7367 /* If something went wrong, issue an error-message and return. */
7371 error ("declaration of %qD as %s", name, error_msg);
7373 error ("creating %s", error_msg);
7375 return error_mark_node;
7380 The constant expressions that specify the bounds of the arrays
7381 can be omitted only for the first member of the sequence. */
7382 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7385 error ("declaration of %qD as multidimensional array must "
7386 "have bounds for all dimensions except the first",
7389 error ("multidimensional array must have bounds for all "
7390 "dimensions except the first");
7392 return error_mark_node;
7395 /* Figure out the index type for the array. */
7397 itype = compute_array_index_type (name, size);
7400 T is called the array element type; this type shall not be [...] an
7401 abstract class type. */
7402 abstract_virtuals_error (name, type);
7404 return build_cplus_array_type (type, itype);
7407 /* Check that it's OK to declare a function with the indicated TYPE.
7408 SFK indicates the kind of special function (if any) that this
7409 function is. OPTYPE is the type given in a conversion operator
7410 declaration, or the class type for a constructor/destructor.
7411 Returns the actual return type of the function; that
7412 may be different than TYPE if an error occurs, or for certain
7413 special functions. */
7416 check_special_function_return_type (special_function_kind sfk,
7422 case sfk_constructor:
7424 error ("return type specification for constructor invalid");
7426 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7427 type = build_pointer_type (optype);
7429 type = void_type_node;
7432 case sfk_destructor:
7434 error ("return type specification for destructor invalid");
7435 /* We can't use the proper return type here because we run into
7436 problems with ambiguous bases and covariant returns.
7437 Java classes are left unchanged because (void *) isn't a valid
7438 Java type, and we don't want to change the Java ABI. */
7439 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7440 type = build_pointer_type (void_type_node);
7442 type = void_type_node;
7445 case sfk_conversion:
7447 error ("return type specified for %<operator %T%>", optype);
7458 /* A variable or data member (whose unqualified name is IDENTIFIER)
7459 has been declared with the indicated TYPE. If the TYPE is not
7460 acceptable, issue an error message and return a type to use for
7461 error-recovery purposes. */
7464 check_var_type (tree identifier, tree type)
7466 if (VOID_TYPE_P (type))
7469 error ("unnamed variable or field declared void");
7470 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7472 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7473 error ("variable or field %qE declared void", identifier);
7476 error ("variable or field declared void");
7477 type = error_mark_node;
7483 /* Given declspecs and a declarator (abstract or otherwise), determine
7484 the name and type of the object declared and construct a DECL node
7487 DECLSPECS points to the representation of declaration-specifier
7488 sequence that precedes declarator.
7490 DECL_CONTEXT says which syntactic context this declaration is in:
7491 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7492 FUNCDEF for a function definition. Like NORMAL but a few different
7493 error messages in each case. Return value may be zero meaning
7494 this definition is too screwy to try to parse.
7495 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7496 handle member functions (which have FIELD context).
7497 Return value may be zero meaning this definition is too screwy to
7499 PARM for a parameter declaration (either within a function prototype
7500 or before a function body). Make a PARM_DECL, or return void_type_node.
7501 CATCHPARM for a parameter declaration before a catch clause.
7502 TYPENAME if for a typename (in a cast or sizeof).
7503 Don't make a DECL node; just return the ..._TYPE node.
7504 FIELD for a struct or union field; make a FIELD_DECL.
7505 BITFIELD for a field with specified width.
7506 INITIALIZED is as for start_decl.
7508 ATTRLIST is a pointer to the list of attributes, which may be NULL
7509 if there are none; *ATTRLIST may be modified if attributes from inside
7510 the declarator should be applied to the declaration.
7512 When this function is called, scoping variables (such as
7513 CURRENT_CLASS_TYPE) should reflect the scope in which the
7514 declaration occurs, not the scope in which the new declaration will
7515 be placed. For example, on:
7519 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7522 Returns a DECL (if a declarator is present), a TYPE (if there is no
7523 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7527 grokdeclarator (const cp_declarator *declarator,
7528 const cp_decl_specifier_seq *declspecs,
7529 enum decl_context decl_context,
7533 tree type = NULL_TREE;
7535 int virtualp, explicitp, friendp, inlinep, staticp;
7536 int explicit_int = 0;
7537 int explicit_char = 0;
7538 int defaulted_int = 0;
7539 tree dependent_name = NULL_TREE;
7541 tree typedef_decl = NULL_TREE;
7542 const char *name = NULL;
7543 tree typedef_type = NULL_TREE;
7544 /* True if this declarator is a function definition. */
7545 bool funcdef_flag = false;
7546 cp_declarator_kind innermost_code = cdk_error;
7549 /* See the code below that used this. */
7550 tree decl_attr = NULL_TREE;
7553 /* Keep track of what sort of function is being processed
7554 so that we can warn about default return values, or explicit
7555 return values which do not match prescribed defaults. */
7556 special_function_kind sfk = sfk_none;
7558 tree dname = NULL_TREE;
7559 tree ctor_return_type = NULL_TREE;
7560 enum overload_flags flags = NO_SPECIAL;
7561 /* cv-qualifiers that apply to the declarator, for a declaration of
7562 a member function. */
7563 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7564 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7566 tree raises = NULL_TREE;
7567 int template_count = 0;
7568 tree returned_attrs = NULL_TREE;
7569 tree parms = NULL_TREE;
7570 const cp_declarator *id_declarator;
7571 /* The unqualified name of the declarator; either an
7572 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7573 tree unqualified_id;
7574 /* The class type, if any, in which this entity is located,
7575 or NULL_TREE if none. Note that this value may be different from
7576 the current class type; for example if an attempt is made to declare
7577 "A::f" inside "B", this value will be "A". */
7578 tree ctype = current_class_type;
7579 /* The NAMESPACE_DECL for the namespace in which this entity is
7580 located. If an unqualified name is used to declare the entity,
7581 this value will be NULL_TREE, even if the entity is located at
7583 tree in_namespace = NULL_TREE;
7584 cp_storage_class storage_class;
7585 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7586 bool type_was_error_mark_node = false;
7587 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7588 bool template_type_arg = false;
7591 signed_p = declspecs->specs[(int)ds_signed];
7592 unsigned_p = declspecs->specs[(int)ds_unsigned];
7593 short_p = declspecs->specs[(int)ds_short];
7594 long_p = declspecs->specs[(int)ds_long];
7595 longlong = declspecs->specs[(int)ds_long] >= 2;
7596 thread_p = declspecs->specs[(int)ds_thread];
7598 if (decl_context == FUNCDEF)
7599 funcdef_flag = true, decl_context = NORMAL;
7600 else if (decl_context == MEMFUNCDEF)
7601 funcdef_flag = true, decl_context = FIELD;
7602 else if (decl_context == BITFIELD)
7603 bitfield = 1, decl_context = FIELD;
7604 else if (decl_context == TEMPLATE_TYPE_ARG)
7605 template_type_arg = true, decl_context = TYPENAME;
7607 if (initialized > 1)
7608 funcdef_flag = true;
7610 /* Look inside a declarator for the name being declared
7611 and get it as a string, for an error message. */
7612 for (id_declarator = declarator;
7614 id_declarator = id_declarator->declarator)
7616 if (id_declarator->kind != cdk_id)
7617 innermost_code = id_declarator->kind;
7619 switch (id_declarator->kind)
7622 if (id_declarator->declarator
7623 && id_declarator->declarator->kind == cdk_id)
7625 sfk = id_declarator->declarator->u.id.sfk;
7626 if (sfk == sfk_destructor)
7633 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7634 tree decl = id_declarator->u.id.unqualified_name;
7637 if (qualifying_scope)
7639 if (at_function_scope_p ())
7643 A declarator-id shall not be qualified except
7646 None of the cases are permitted in block
7648 if (qualifying_scope == global_namespace)
7649 error ("invalid use of qualified-name %<::%D%>",
7651 else if (TYPE_P (qualifying_scope))
7652 error ("invalid use of qualified-name %<%T::%D%>",
7653 qualifying_scope, decl);
7655 error ("invalid use of qualified-name %<%D::%D%>",
7656 qualifying_scope, decl);
7657 return error_mark_node;
7659 else if (TYPE_P (qualifying_scope))
7661 ctype = qualifying_scope;
7662 if (innermost_code != cdk_function
7663 && current_class_type
7664 && !UNIQUELY_DERIVED_FROM_P (ctype,
7665 current_class_type))
7667 error ("type %qT is not derived from type %qT",
7668 ctype, current_class_type);
7669 return error_mark_node;
7672 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7673 in_namespace = qualifying_scope;
7675 switch (TREE_CODE (decl))
7681 if (innermost_code != cdk_function)
7683 error ("declaration of %qD as non-function", decl);
7684 return error_mark_node;
7686 else if (!qualifying_scope
7687 && !(current_class_type && at_class_scope_p ()))
7689 error ("declaration of %qD as non-member", decl);
7690 return error_mark_node;
7693 type = TREE_OPERAND (decl, 0);
7695 type = constructor_name (type);
7696 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7701 case TEMPLATE_ID_EXPR:
7703 tree fns = TREE_OPERAND (decl, 0);
7706 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7708 gcc_assert (is_overloaded_fn (dname));
7709 dname = DECL_NAME (get_first_fn (dname));
7714 case IDENTIFIER_NODE:
7715 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7718 if (C_IS_RESERVED_WORD (dname))
7720 error ("declarator-id missing; using reserved word %qD",
7722 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7724 else if (!IDENTIFIER_TYPENAME_P (dname))
7725 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7728 gcc_assert (flags == NO_SPECIAL);
7729 flags = TYPENAME_FLAG;
7730 ctor_return_type = TREE_TYPE (dname);
7731 sfk = sfk_conversion;
7732 if (is_typename_at_global_scope (dname))
7733 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7735 name = "<invalid operator>";
7752 return error_mark_node;
7757 if (id_declarator->kind == cdk_id)
7763 The declarator in a function-definition shall have the form
7764 D1 ( parameter-declaration-clause) ... */
7765 if (funcdef_flag && innermost_code != cdk_function)
7767 error ("function definition does not declare parameters");
7768 return error_mark_node;
7771 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7772 && innermost_code != cdk_function
7773 && ! (ctype && !declspecs->any_specifiers_p))
7775 error ("declaration of %qD as non-function", dname);
7776 return error_mark_node;
7779 /* Anything declared one level down from the top level
7780 must be one of the parameters of a function
7781 (because the body is at least two levels down). */
7783 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7784 by not allowing C++ class definitions to specify their parameters
7785 with xdecls (must be spec.d in the parmlist).
7787 Since we now wait to push a class scope until we are sure that
7788 we are in a legitimate method context, we must set oldcname
7789 explicitly (since current_class_name is not yet alive).
7791 We also want to avoid calling this a PARM if it is in a namespace. */
7793 if (decl_context == NORMAL && !toplevel_bindings_p ())
7795 struct cp_binding_level *b = current_binding_level;
7796 current_binding_level = b->level_chain;
7797 if (current_binding_level != 0 && toplevel_bindings_p ())
7798 decl_context = PARM;
7799 current_binding_level = b;
7803 name = decl_context == PARM ? "parameter" : "type name";
7805 /* If there were multiple types specified in the decl-specifier-seq,
7806 issue an error message. */
7807 if (declspecs->multiple_types_p)
7809 error ("two or more data types in declaration of %qs", name);
7810 return error_mark_node;
7813 if (declspecs->conflicting_specifiers_p)
7815 error ("conflicting specifiers in declaration of %qs", name);
7816 return error_mark_node;
7819 /* Extract the basic type from the decl-specifier-seq. */
7820 type = declspecs->type;
7821 if (type == error_mark_node)
7824 type_was_error_mark_node = true;
7826 /* If the entire declaration is itself tagged as deprecated then
7827 suppress reports of deprecated items. */
7828 if (type && TREE_DEPRECATED (type)
7829 && deprecated_state != DEPRECATED_SUPPRESS)
7830 warn_deprecated_use (type, NULL_TREE);
7831 if (type && TREE_CODE (type) == TYPE_DECL)
7833 typedef_decl = type;
7834 type = TREE_TYPE (typedef_decl);
7835 if (TREE_DEPRECATED (type)
7836 && DECL_ARTIFICIAL (typedef_decl)
7837 && deprecated_state != DEPRECATED_SUPPRESS)
7838 warn_deprecated_use (type, NULL_TREE);
7840 /* No type at all: default to `int', and set DEFAULTED_INT
7841 because it was not a user-defined typedef. */
7842 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7844 /* These imply 'int'. */
7845 type = integer_type_node;
7849 explicit_int = declspecs->explicit_int_p;
7850 explicit_char = declspecs->explicit_char_p;
7853 /* See the code below that used this. */
7855 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7857 typedef_type = type;
7860 if (sfk != sfk_conversion)
7861 ctor_return_type = ctype;
7863 if (sfk != sfk_none)
7864 type = check_special_function_return_type (sfk, type,
7866 else if (type == NULL_TREE)
7872 /* We handle `main' specially here, because 'main () { }' is so
7873 common. With no options, it is allowed. With -Wreturn-type,
7874 it is a warning. It is only an error with -pedantic-errors. */
7875 is_main = (funcdef_flag
7876 && dname && MAIN_NAME_P (dname)
7877 && ctype == NULL_TREE
7878 && in_namespace == NULL_TREE
7879 && current_namespace == global_namespace);
7881 if (type_was_error_mark_node)
7882 /* We've already issued an error, don't complain more. */;
7883 else if (in_system_header || flag_ms_extensions)
7884 /* Allow it, sigh. */;
7886 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7888 pedwarn (input_location, OPT_pedantic,
7889 "ISO C++ forbids declaration of %qs with no type", name);
7891 warning (OPT_Wreturn_type,
7892 "ISO C++ forbids declaration of %qs with no type", name);
7894 type = integer_type_node;
7899 /* Now process the modifiers that were specified
7900 and check for invalid combinations. */
7902 /* Long double is a special combination. */
7903 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7906 type = build_qualified_type (long_double_type_node,
7907 cp_type_quals (type));
7910 /* Check all other uses of type modifiers. */
7912 if (unsigned_p || signed_p || long_p || short_p)
7916 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7917 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7918 else if (signed_p && unsigned_p)
7919 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7920 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7921 error ("%<long long%> invalid for %qs", name);
7922 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7923 error ("%<long%> invalid for %qs", name);
7924 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7925 error ("%<short%> invalid for %qs", name);
7926 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7927 error ("%<long%> or %<short%> invalid for %qs", name);
7928 else if ((long_p || short_p) && explicit_char)
7929 error ("%<long%> or %<short%> specified with char for %qs", name);
7930 else if (long_p && short_p)
7931 error ("%<long%> and %<short%> specified together for %qs", name);
7932 else if (type == char16_type_node || type == char32_type_node)
7934 if (signed_p || unsigned_p)
7935 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7936 else if (short_p || long_p)
7937 error ("%<short%> or %<long%> invalid for %qs", name);
7942 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7944 pedwarn (input_location, OPT_pedantic,
7945 "long, short, signed or unsigned used invalidly for %qs",
7947 if (flag_pedantic_errors)
7952 /* Discard the type modifiers if they are invalid. */
7963 /* Decide whether an integer type is signed or not.
7964 Optionally treat bitfields as signed by default. */
7968 It is implementation-defined whether a plain (neither
7969 explicitly signed or unsigned) char, short, int, or long
7970 bit-field is signed or unsigned.
7972 Naturally, we extend this to long long as well. Note that
7973 this does not include wchar_t. */
7974 || (bitfield && !flag_signed_bitfields
7976 /* A typedef for plain `int' without `signed' can be
7977 controlled just like plain `int', but a typedef for
7978 `signed int' cannot be so controlled. */
7980 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7981 && TREE_CODE (type) == INTEGER_TYPE
7982 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7985 type = long_long_unsigned_type_node;
7987 type = long_unsigned_type_node;
7989 type = short_unsigned_type_node;
7990 else if (type == char_type_node)
7991 type = unsigned_char_type_node;
7992 else if (typedef_decl)
7993 type = unsigned_type_for (type);
7995 type = unsigned_type_node;
7997 else if (signed_p && type == char_type_node)
7998 type = signed_char_type_node;
8000 type = long_long_integer_type_node;
8002 type = long_integer_type_node;
8004 type = short_integer_type_node;
8006 if (declspecs->specs[(int)ds_complex])
8008 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8009 error ("complex invalid for %qs", name);
8010 /* If we just have "complex", it is equivalent to
8011 "complex double", but if any modifiers at all are specified it is
8012 the complex form of TYPE. E.g, "complex short" is
8013 "complex short int". */
8015 else if (defaulted_int && ! longlong
8016 && ! (long_p || short_p || signed_p || unsigned_p))
8017 type = complex_double_type_node;
8018 else if (type == integer_type_node)
8019 type = complex_integer_type_node;
8020 else if (type == float_type_node)
8021 type = complex_float_type_node;
8022 else if (type == double_type_node)
8023 type = complex_double_type_node;
8024 else if (type == long_double_type_node)
8025 type = complex_long_double_type_node;
8027 type = build_complex_type (type);
8030 type_quals = TYPE_UNQUALIFIED;
8031 if (declspecs->specs[(int)ds_const])
8032 type_quals |= TYPE_QUAL_CONST;
8033 if (declspecs->specs[(int)ds_volatile])
8034 type_quals |= TYPE_QUAL_VOLATILE;
8035 if (declspecs->specs[(int)ds_restrict])
8036 type_quals |= TYPE_QUAL_RESTRICT;
8037 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8038 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8041 if (TREE_CODE (type) == FUNCTION_TYPE
8042 && type_quals != TYPE_UNQUALIFIED)
8044 /* This was an error in C++98 (cv-qualifiers cannot be added to
8045 a function type), but DR 295 makes the code well-formed by
8046 dropping the extra qualifiers. */
8049 tree bad_type = build_qualified_type (type, type_quals);
8050 pedwarn (input_location, OPT_pedantic,
8051 "ignoring %qV qualifiers added to function type %qT",
8054 type_quals = TYPE_UNQUALIFIED;
8056 type_quals |= cp_type_quals (type);
8057 type = cp_build_qualified_type_real
8058 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8059 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8060 /* We might have ignored or rejected some of the qualifiers. */
8061 type_quals = cp_type_quals (type);
8064 inlinep = !! declspecs->specs[(int)ds_inline];
8065 virtualp = !! declspecs->specs[(int)ds_virtual];
8066 explicitp = !! declspecs->specs[(int)ds_explicit];
8068 storage_class = declspecs->storage_class;
8069 if (storage_class == sc_static)
8070 staticp = 1 + (decl_context == FIELD);
8072 if (virtualp && staticp == 2)
8074 error ("member %qD cannot be declared both virtual and static", dname);
8075 storage_class = sc_none;
8078 friendp = !! declspecs->specs[(int)ds_friend];
8080 if (dependent_name && !friendp)
8082 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8083 return error_mark_node;
8086 /* Issue errors about use of storage classes for parameters. */
8087 if (decl_context == PARM)
8089 if (declspecs->specs[(int)ds_typedef])
8091 error ("typedef declaration invalid in parameter declaration");
8092 return error_mark_node;
8094 else if (storage_class == sc_static
8095 || storage_class == sc_extern
8097 error ("storage class specifiers invalid in parameter declarations");
8099 if (type_uses_auto (type))
8101 error ("parameter declared %<auto%>");
8102 type = error_mark_node;
8106 /* Give error if `virtual' is used outside of class declaration. */
8108 && (current_class_name == NULL_TREE || decl_context != FIELD))
8110 error ("%<virtual%> outside class declaration");
8114 /* Static anonymous unions are dealt with here. */
8115 if (staticp && decl_context == TYPENAME
8117 && ANON_AGGR_TYPE_P (declspecs->type))
8118 decl_context = FIELD;
8120 /* Warn about storage classes that are invalid for certain
8121 kinds of declarations (parameters, typenames, etc.). */
8124 && storage_class != sc_extern
8125 && storage_class != sc_static)
8126 || declspecs->specs[(int)ds_typedef]))
8128 error ("multiple storage classes in declaration of %qs", name);
8131 if (decl_context != NORMAL
8132 && ((storage_class != sc_none
8133 && storage_class != sc_mutable)
8136 if ((decl_context == PARM || decl_context == CATCHPARM)
8137 && (storage_class == sc_register
8138 || storage_class == sc_auto))
8140 else if (declspecs->specs[(int)ds_typedef])
8142 else if (decl_context == FIELD
8143 /* C++ allows static class elements. */
8144 && storage_class == sc_static)
8145 /* C++ also allows inlines and signed and unsigned elements,
8146 but in those cases we don't come in here. */
8150 if (decl_context == FIELD)
8151 error ("storage class specified for %qs", name);
8154 if (decl_context == PARM || decl_context == CATCHPARM)
8155 error ("storage class specified for parameter %qs", name);
8157 error ("storage class specified for typename");
8159 if (storage_class == sc_register
8160 || storage_class == sc_auto
8161 || storage_class == sc_extern
8163 storage_class = sc_none;
8166 else if (storage_class == sc_extern && funcdef_flag
8167 && ! toplevel_bindings_p ())
8168 error ("nested function %qs declared %<extern%>", name);
8169 else if (toplevel_bindings_p ())
8171 if (storage_class == sc_auto)
8172 error ("top-level declaration of %qs specifies %<auto%>", name);
8175 && storage_class != sc_extern
8176 && storage_class != sc_static)
8178 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8183 if (storage_class && friendp)
8185 error ("storage class specifiers invalid in friend function declarations");
8186 storage_class = sc_none;
8191 unqualified_id = NULL_TREE;
8194 unqualified_id = id_declarator->u.id.unqualified_name;
8195 switch (TREE_CODE (unqualified_id))
8198 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8199 if (TYPE_P (unqualified_id))
8200 unqualified_id = constructor_name (unqualified_id);
8203 case IDENTIFIER_NODE:
8204 case TEMPLATE_ID_EXPR:
8212 /* Determine the type of the entity declared by recurring on the
8214 for (; declarator; declarator = declarator->declarator)
8216 const cp_declarator *inner_declarator;
8219 if (type == error_mark_node)
8220 return error_mark_node;
8222 attrs = declarator->attributes;
8228 if (declarator == NULL || declarator->kind == cdk_id)
8229 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8230 if (declarator->kind == cdk_function)
8231 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8232 if (declarator->kind == cdk_array)
8233 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8234 returned_attrs = decl_attributes (&type,
8235 chainon (returned_attrs, attrs),
8239 if (declarator->kind == cdk_id)
8242 inner_declarator = declarator->declarator;
8244 switch (declarator->kind)
8247 type = create_array_type_for_decl (dname, type,
8248 declarator->u.array.bounds);
8256 /* Declaring a function type.
8257 Make sure we have a valid type for the function to return. */
8259 if (type_quals != TYPE_UNQUALIFIED)
8261 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8262 warning (OPT_Wignored_qualifiers,
8263 "type qualifiers ignored on function return type");
8264 /* We now know that the TYPE_QUALS don't apply to the
8265 decl, but to its return type. */
8266 type_quals = TYPE_UNQUALIFIED;
8268 errmsg = targetm.invalid_return_type (type);
8272 type = integer_type_node;
8275 /* Error about some types functions can't return. */
8277 if (TREE_CODE (type) == FUNCTION_TYPE)
8279 error ("%qs declared as function returning a function", name);
8280 return error_mark_node;
8282 if (TREE_CODE (type) == ARRAY_TYPE)
8284 error ("%qs declared as function returning an array", name);
8285 return error_mark_node;
8288 /* Pick up type qualifiers which should be applied to `this'. */
8289 memfn_quals = declarator->u.function.qualifiers;
8291 /* Pick up the exception specifications. */
8292 raises = declarator->u.function.exception_specification;
8294 /* Say it's a definition only for the CALL_EXPR
8295 closest to the identifier. */
8296 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8298 /* Handle a late-specified return type. */
8301 if (type_uses_auto (type))
8303 if (!declarator->u.function.late_return_type)
8305 error ("%qs function uses %<auto%> type specifier without"
8306 " late return type", name);
8307 return error_mark_node;
8309 else if (!is_auto (type))
8311 error ("%qs function with late return type has"
8312 " %qT as its type rather than plain %<auto%>",
8314 return error_mark_node;
8317 else if (declarator->u.function.late_return_type)
8319 error ("%qs function with late return type not declared"
8320 " with %<auto%> type specifier", name);
8321 return error_mark_node;
8324 type = splice_late_return_type
8325 (type, declarator->u.function.late_return_type);
8326 if (type == error_mark_node)
8327 return error_mark_node;
8329 if (ctype == NULL_TREE
8330 && decl_context == FIELD
8332 && (friendp == 0 || dname == current_class_name))
8333 ctype = current_class_type;
8335 if (ctype && (sfk == sfk_constructor
8336 || sfk == sfk_destructor))
8338 /* We are within a class's scope. If our declarator name
8339 is the same as the class name, and we are defining
8340 a function, then it is a constructor/destructor, and
8341 therefore returns a void type. */
8343 /* ISO C++ 12.4/2. A destructor may not be declared
8344 const or volatile. A destructor may not be
8347 ISO C++ 12.1. A constructor may not be declared
8348 const or volatile. A constructor may not be
8349 virtual. A constructor may not be static. */
8351 error ((flags == DTOR_FLAG)
8352 ? "destructor cannot be static member function"
8353 : "constructor cannot be static member function");
8356 error ((flags == DTOR_FLAG)
8357 ? "destructors may not be cv-qualified"
8358 : "constructors may not be cv-qualified");
8359 memfn_quals = TYPE_UNQUALIFIED;
8362 if (decl_context == FIELD
8363 && !member_function_or_else (ctype,
8366 return error_mark_node;
8368 if (flags != DTOR_FLAG)
8370 /* It's a constructor. */
8375 permerror (input_location, "constructors cannot be declared virtual");
8378 if (decl_context == FIELD
8379 && sfk != sfk_constructor)
8380 return error_mark_node;
8382 if (decl_context == FIELD)
8388 error ("can't initialize friend function %qs", name);
8391 /* Cannot be both friend and virtual. */
8392 error ("virtual functions cannot be friends");
8395 if (decl_context == NORMAL)
8396 error ("friend declaration not in class definition");
8397 if (current_function_decl && funcdef_flag)
8398 error ("can't define friend function %qs in a local "
8402 else if (ctype && sfk == sfk_conversion)
8406 maybe_warn_cpp0x ("explicit conversion operators");
8411 arg_types = grokparms (declarator->u.function.parameters,
8414 if (inner_declarator
8415 && inner_declarator->kind == cdk_id
8416 && inner_declarator->u.id.sfk == sfk_destructor
8417 && arg_types != void_list_node)
8419 error ("destructors may not have parameters");
8420 arg_types = void_list_node;
8424 type = build_function_type (type, arg_types);
8431 /* Filter out pointers-to-references and references-to-references.
8432 We can get these if a TYPE_DECL is used. */
8434 if (TREE_CODE (type) == REFERENCE_TYPE)
8436 if (declarator->kind != cdk_reference)
8438 error ("cannot declare pointer to %q#T", type);
8439 type = TREE_TYPE (type);
8442 /* In C++0x, we allow reference to reference declarations
8443 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8444 and template type arguments [14.3.1/4 temp.arg.type]. The
8445 check for direct reference to reference declarations, which
8446 are still forbidden, occurs below. Reasoning behind the change
8447 can be found in DR106, DR540, and the rvalue reference
8449 else if (cxx_dialect == cxx98)
8451 error ("cannot declare reference to %q#T", type);
8452 type = TREE_TYPE (type);
8455 else if (VOID_TYPE_P (type))
8457 if (declarator->kind == cdk_reference)
8458 error ("cannot declare reference to %q#T", type);
8459 else if (declarator->kind == cdk_ptrmem)
8460 error ("cannot declare pointer to %q#T member", type);
8463 /* We now know that the TYPE_QUALS don't apply to the decl,
8464 but to the target of the pointer. */
8465 type_quals = TYPE_UNQUALIFIED;
8467 if (declarator->kind == cdk_ptrmem
8468 && (TREE_CODE (type) == FUNCTION_TYPE
8469 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8471 memfn_quals |= cp_type_quals (type);
8472 type = build_memfn_type (type,
8473 declarator->u.pointer.class_type,
8475 memfn_quals = TYPE_UNQUALIFIED;
8478 if (TREE_CODE (type) == FUNCTION_TYPE
8479 && cp_type_quals (type) != TYPE_UNQUALIFIED)
8480 error ("cannot declare %s to qualified function type %qT",
8481 declarator->kind == cdk_reference ? "reference" : "pointer",
8484 if (declarator->kind == cdk_reference)
8486 /* In C++0x, the type we are creating a reference to might be
8487 a typedef which is itself a reference type. In that case,
8488 we follow the reference collapsing rules in
8489 [7.1.3/8 dcl.typedef] to create the final reference type:
8491 "If a typedef TD names a type that is a reference to a type
8492 T, an attempt to create the type 'lvalue reference to cv TD'
8493 creates the type 'lvalue reference to T,' while an attempt
8494 to create the type "rvalue reference to cv TD' creates the
8497 if (!VOID_TYPE_P (type))
8498 type = cp_build_reference_type
8499 ((TREE_CODE (type) == REFERENCE_TYPE
8500 ? TREE_TYPE (type) : type),
8501 (declarator->u.reference.rvalue_ref
8502 && (TREE_CODE(type) != REFERENCE_TYPE
8503 || TYPE_REF_IS_RVALUE (type))));
8505 /* In C++0x, we need this check for direct reference to
8506 reference declarations, which are forbidden by
8507 [8.3.2/5 dcl.ref]. Reference to reference declarations
8508 are only allowed indirectly through typedefs and template
8509 type arguments. Example:
8511 void foo(int & &); // invalid ref-to-ref decl
8513 typedef int & int_ref;
8514 void foo(int_ref &); // valid ref-to-ref decl
8516 if (inner_declarator && inner_declarator->kind == cdk_reference)
8517 error ("cannot declare reference to %q#T, which is not "
8518 "a typedef or a template type argument", type);
8520 else if (TREE_CODE (type) == METHOD_TYPE)
8521 type = build_ptrmemfunc_type (build_pointer_type (type));
8522 else if (declarator->kind == cdk_ptrmem)
8524 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8526 if (declarator->u.pointer.class_type == error_mark_node)
8527 /* We will already have complained. */
8528 type = error_mark_node;
8530 type = build_ptrmem_type (declarator->u.pointer.class_type,
8534 type = build_pointer_type (type);
8536 /* Process a list of type modifier keywords (such as
8537 const or volatile) that were given inside the `*' or `&'. */
8539 if (declarator->u.pointer.qualifiers)
8542 = cp_build_qualified_type (type,
8543 declarator->u.pointer.qualifiers);
8544 type_quals = cp_type_quals (type);
8557 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8558 && TREE_CODE (type) != FUNCTION_TYPE
8559 && TREE_CODE (type) != METHOD_TYPE)
8561 error ("template-id %qD used as a declarator",
8563 unqualified_id = dname;
8566 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8567 qualified with a class-name, turn it into a METHOD_TYPE, unless
8568 we know that the function is static. We take advantage of this
8569 opportunity to do other processing that pertains to entities
8570 explicitly declared to be class members. Note that if DECLARATOR
8571 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8572 would not have exited the loop above. */
8574 && declarator->u.id.qualifying_scope
8575 && TYPE_P (declarator->u.id.qualifying_scope))
8579 ctype = declarator->u.id.qualifying_scope;
8580 ctype = TYPE_MAIN_VARIANT (ctype);
8582 while (t != NULL_TREE && CLASS_TYPE_P (t))
8584 /* You're supposed to have one `template <...>' for every
8585 template class, but you don't need one for a full
8586 specialization. For example:
8588 template <class T> struct S{};
8589 template <> struct S<int> { void f(); };
8590 void S<int>::f () {}
8592 is correct; there shouldn't be a `template <>' for the
8593 definition of `S<int>::f'. */
8594 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8595 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8596 /* T is an explicit (not partial) specialization. All
8597 containing classes must therefore also be explicitly
8600 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8601 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8602 template_count += 1;
8604 t = TYPE_MAIN_DECL (t);
8605 t = DECL_CONTEXT (t);
8608 if (ctype == current_class_type)
8612 permerror (input_location, "member functions are implicitly friends of their class");
8616 permerror (declarator->id_loc,
8617 "extra qualification %<%T::%> on member %qs",
8620 else if (/* If the qualifying type is already complete, then we
8621 can skip the following checks. */
8622 !COMPLETE_TYPE_P (ctype)
8623 && (/* If the function is being defined, then
8624 qualifying type must certainly be complete. */
8626 /* A friend declaration of "T::f" is OK, even if
8627 "T" is a template parameter. But, if this
8628 function is not a friend, the qualifying type
8630 || (!friendp && !CLASS_TYPE_P (ctype))
8631 /* For a declaration, the type need not be
8632 complete, if either it is dependent (since there
8633 is no meaningful definition of complete in that
8634 case) or the qualifying class is currently being
8636 || !(dependent_type_p (ctype)
8637 || currently_open_class (ctype)))
8638 /* Check that the qualifying type is complete. */
8639 && !complete_type_or_else (ctype, NULL_TREE))
8640 return error_mark_node;
8641 else if (TREE_CODE (type) == FUNCTION_TYPE)
8643 tree sname = declarator->u.id.unqualified_name;
8645 if (current_class_type
8646 && (!friendp || funcdef_flag))
8649 ? "cannot define member function %<%T::%s%> within %<%T%>"
8650 : "cannot declare member function %<%T::%s%> within %<%T%>",
8651 ctype, name, current_class_type);
8652 return error_mark_node;
8655 if (TREE_CODE (sname) == IDENTIFIER_NODE
8656 && NEW_DELETE_OPNAME_P (sname))
8657 /* Overloaded operator new and operator delete
8658 are always static functions. */
8661 type = build_memfn_type (type, ctype, memfn_quals);
8663 else if (declspecs->specs[(int)ds_typedef]
8664 && current_class_type)
8666 error ("cannot declare member %<%T::%s%> within %qT",
8667 ctype, name, current_class_type);
8668 return error_mark_node;
8672 /* Now TYPE has the actual type. */
8677 *attrlist = chainon (returned_attrs, *attrlist);
8679 attrlist = &returned_attrs;
8682 /* Handle parameter packs. */
8683 if (parameter_pack_p)
8685 if (decl_context == PARM)
8686 /* Turn the type into a pack expansion.*/
8687 type = make_pack_expansion (type);
8689 error ("non-parameter %qs cannot be a parameter pack", name);
8692 /* Did array size calculations overflow? */
8694 if (TREE_CODE (type) == ARRAY_TYPE
8695 && COMPLETE_TYPE_P (type)
8696 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8697 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8699 error ("size of array %qs is too large", name);
8700 /* If we proceed with the array type as it is, we'll eventually
8701 crash in tree_low_cst(). */
8702 type = error_mark_node;
8705 if ((decl_context == FIELD || decl_context == PARM)
8706 && !processing_template_decl
8707 && variably_modified_type_p (type, NULL_TREE))
8709 if (decl_context == FIELD)
8710 error ("data member may not have variably modified type %qT", type);
8712 error ("parameter may not have variably modified type %qT", type);
8713 type = error_mark_node;
8716 if (explicitp == 1 || (explicitp && friendp))
8718 /* [dcl.fct.spec] The explicit specifier shall only be used in
8719 declarations of constructors within a class definition. */
8720 error ("only declarations of constructors can be %<explicit%>");
8724 if (storage_class == sc_mutable)
8726 if (decl_context != FIELD || friendp)
8728 error ("non-member %qs cannot be declared %<mutable%>", name);
8729 storage_class = sc_none;
8731 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8733 error ("non-object member %qs cannot be declared %<mutable%>", name);
8734 storage_class = sc_none;
8736 else if (TREE_CODE (type) == FUNCTION_TYPE
8737 || TREE_CODE (type) == METHOD_TYPE)
8739 error ("function %qs cannot be declared %<mutable%>", name);
8740 storage_class = sc_none;
8744 error ("static %qs cannot be declared %<mutable%>", name);
8745 storage_class = sc_none;
8747 else if (type_quals & TYPE_QUAL_CONST)
8749 error ("const %qs cannot be declared %<mutable%>", name);
8750 storage_class = sc_none;
8754 /* If this is declaring a typedef name, return a TYPE_DECL. */
8755 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8759 /* Note that the grammar rejects storage classes
8760 in typenames, fields or parameters. */
8761 if (current_lang_name == lang_name_java)
8762 TYPE_FOR_JAVA (type) = 1;
8764 /* This declaration:
8766 typedef void f(int) const;
8768 declares a function type which is not a member of any
8769 particular class, but which is cv-qualified; for
8770 example "f S::*" declares a pointer to a const-qualified
8771 member function of S. We record the cv-qualification in the
8773 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8775 type = cp_build_qualified_type (type, memfn_quals);
8777 /* We have now dealt with these qualifiers. */
8778 memfn_quals = TYPE_UNQUALIFIED;
8781 if (decl_context == FIELD)
8782 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8784 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
8785 if (id_declarator && declarator->u.id.qualifying_scope) {
8786 error_at (DECL_SOURCE_LOCATION (decl),
8787 "typedef name may not be a nested-name-specifier");
8788 TREE_TYPE (decl) = error_mark_node;
8791 if (decl_context != FIELD)
8793 if (!current_function_decl)
8794 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8795 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8796 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8797 (current_function_decl)))
8798 /* The TYPE_DECL is "abstract" because there will be
8799 clones of this constructor/destructor, and there will
8800 be copies of this TYPE_DECL generated in those
8802 DECL_ABSTRACT (decl) = 1;
8804 else if (constructor_name_p (unqualified_id, current_class_type))
8805 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8806 "as enclosing class",
8809 /* If the user declares "typedef struct {...} foo" then the
8810 struct will have an anonymous name. Fill that name in now.
8811 Nothing can refer to it, so nothing needs know about the name
8813 if (type != error_mark_node
8816 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8817 && TYPE_ANONYMOUS_P (type)
8818 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8822 /* Replace the anonymous name with the real name everywhere. */
8823 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8825 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
8827 debug_hooks->set_name (t, decl);
8828 TYPE_NAME (t) = decl;
8832 if (TYPE_LANG_SPECIFIC (type))
8833 TYPE_WAS_ANONYMOUS (type) = 1;
8835 /* If this is a typedef within a template class, the nested
8836 type is a (non-primary) template. The name for the
8837 template needs updating as well. */
8838 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8839 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8840 = TYPE_IDENTIFIER (type);
8842 /* Adjust linkage now that we aren't anonymous anymore. */
8843 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
8844 determine_visibility (TYPE_MAIN_DECL (type));
8846 /* FIXME remangle member functions; member functions of a
8847 type with external linkage have external linkage. */
8851 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8852 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8854 bad_specifiers (decl, "type", virtualp,
8855 memfn_quals != TYPE_UNQUALIFIED,
8856 inlinep, friendp, raises != NULL_TREE);
8861 /* Detect the case of an array type of unspecified size
8862 which came, as such, direct from a typedef name.
8863 We must copy the type, so that the array's domain can be
8864 individually set by the object's initializer. */
8866 if (type && typedef_type
8867 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8868 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8869 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8871 /* Detect where we're using a typedef of function type to declare a
8872 function. PARMS will not be set, so we must create it now. */
8874 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8876 tree decls = NULL_TREE;
8879 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8881 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8883 TREE_CHAIN (decl) = decls;
8887 parms = nreverse (decls);
8889 if (decl_context != TYPENAME)
8891 /* A cv-qualifier-seq shall only be part of the function type
8892 for a non-static member function. [8.3.5/4 dcl.fct] */
8893 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8894 && (current_class_type == NULL_TREE || staticp) )
8897 ? G_("qualified function types cannot be used to "
8898 "declare static member functions")
8899 : G_("qualified function types cannot be used to "
8900 "declare free functions"));
8901 type = TYPE_MAIN_VARIANT (type);
8904 /* The qualifiers on the function type become the qualifiers on
8905 the non-static member function. */
8906 memfn_quals |= cp_type_quals (type);
8910 /* If this is a type name (such as, in a cast or sizeof),
8911 compute the type and return it now. */
8913 if (decl_context == TYPENAME)
8915 /* Note that the grammar rejects storage classes
8916 in typenames, fields or parameters. */
8917 if (type_quals != TYPE_UNQUALIFIED)
8918 type_quals = TYPE_UNQUALIFIED;
8920 /* Special case: "friend class foo" looks like a TYPENAME context. */
8923 if (type_quals != TYPE_UNQUALIFIED)
8925 error ("type qualifiers specified for friend class declaration");
8926 type_quals = TYPE_UNQUALIFIED;
8930 error ("%<inline%> specified for friend class declaration");
8936 /* Don't allow friend declaration without a class-key. */
8937 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8938 permerror (input_location, "template parameters cannot be friends");
8939 else if (TREE_CODE (type) == TYPENAME_TYPE)
8940 permerror (input_location, "friend declaration requires class-key, "
8941 "i.e. %<friend class %T::%D%>",
8942 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8944 permerror (input_location, "friend declaration requires class-key, "
8945 "i.e. %<friend %#T%>",
8949 /* Only try to do this stuff if we didn't already give up. */
8950 if (type != integer_type_node)
8952 /* A friendly class? */
8953 if (current_class_type)
8954 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8957 error ("trying to make class %qT a friend of global scope",
8960 type = void_type_node;
8963 else if (memfn_quals)
8965 if (ctype == NULL_TREE
8966 && TREE_CODE (type) == METHOD_TYPE)
8967 ctype = TYPE_METHOD_BASETYPE (type);
8970 type = build_memfn_type (type, ctype, memfn_quals);
8971 /* Core issue #547: need to allow this in template type args. */
8972 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
8973 type = cp_build_qualified_type (type, memfn_quals);
8975 error ("invalid qualifiers on non-member function type");
8980 else if (unqualified_id == NULL_TREE && decl_context != PARM
8981 && decl_context != CATCHPARM
8982 && TREE_CODE (type) != UNION_TYPE
8985 error ("abstract declarator %qT used as declaration", type);
8986 return error_mark_node;
8989 /* Only functions may be declared using an operator-function-id. */
8991 && IDENTIFIER_OPNAME_P (unqualified_id)
8992 && TREE_CODE (type) != FUNCTION_TYPE
8993 && TREE_CODE (type) != METHOD_TYPE)
8995 error ("declaration of %qD as non-function", unqualified_id);
8996 return error_mark_node;
8999 /* We don't check parameter types here because we can emit a better
9000 error message later. */
9001 if (decl_context != PARM)
9003 type = check_var_type (unqualified_id, type);
9004 if (type == error_mark_node)
9005 return error_mark_node;
9008 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9009 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9011 if (decl_context == PARM || decl_context == CATCHPARM)
9013 if (ctype || in_namespace)
9014 error ("cannot use %<::%> in parameter declaration");
9016 /* A parameter declared as an array of T is really a pointer to T.
9017 One declared as a function is really a pointer to a function.
9018 One declared as a member is really a pointer to member. */
9020 if (TREE_CODE (type) == ARRAY_TYPE)
9022 /* Transfer const-ness of array into that of type pointed to. */
9023 type = build_pointer_type (TREE_TYPE (type));
9024 type_quals = TYPE_UNQUALIFIED;
9026 else if (TREE_CODE (type) == FUNCTION_TYPE)
9027 type = build_pointer_type (type);
9033 if (decl_context == PARM)
9035 decl = cp_build_parm_decl (unqualified_id, type);
9037 bad_specifiers (decl, "parameter", virtualp,
9038 memfn_quals != TYPE_UNQUALIFIED,
9039 inlinep, friendp, raises != NULL_TREE);
9041 else if (decl_context == FIELD)
9043 /* The C99 flexible array extension. */
9044 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9045 && TYPE_DOMAIN (type) == NULL_TREE)
9047 tree itype = compute_array_index_type (dname, integer_zero_node);
9048 type = build_cplus_array_type (TREE_TYPE (type), itype);
9051 if (type == error_mark_node)
9053 /* Happens when declaring arrays of sizes which
9054 are error_mark_node, for example. */
9057 else if (in_namespace && !friendp)
9059 /* Something like struct S { int N::j; }; */
9060 error ("invalid use of %<::%>");
9061 return error_mark_node;
9063 else if (TREE_CODE (type) == FUNCTION_TYPE)
9066 tree function_context;
9070 if (ctype == NULL_TREE)
9071 ctype = current_class_type;
9073 if (ctype == NULL_TREE)
9075 error ("can't make %qD into a method -- not in a class",
9077 return error_mark_node;
9080 /* ``A union may [ ... ] not [ have ] virtual functions.''
9082 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9084 error ("function %qD declared virtual inside a union",
9086 return error_mark_node;
9089 if (NEW_DELETE_OPNAME_P (unqualified_id))
9093 error ("%qD cannot be declared virtual, since it "
9099 else if (staticp < 2)
9100 type = build_memfn_type (type, ctype, memfn_quals);
9103 /* Check that the name used for a destructor makes sense. */
9104 if (sfk == sfk_destructor)
9106 tree uqname = id_declarator->u.id.unqualified_name;
9110 gcc_assert (friendp);
9111 error ("expected qualified name in friend declaration "
9112 "for destructor %qD", uqname);
9113 return error_mark_node;
9116 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9118 error ("declaration of %qD as member of %qT",
9120 return error_mark_node;
9123 else if (sfk == sfk_constructor && friendp)
9125 error ("expected qualified name in friend declaration "
9126 "for constructor %qD",
9127 id_declarator->u.id.unqualified_name);
9128 return error_mark_node;
9131 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9132 function_context = (ctype != NULL_TREE) ?
9133 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9134 publicp = (! friendp || ! staticp)
9135 && function_context == NULL_TREE;
9136 decl = grokfndecl (ctype, type,
9137 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9138 ? unqualified_id : dname,
9141 virtualp, flags, memfn_quals, raises,
9142 friendp ? -1 : 0, friendp, publicp, inlinep,
9144 funcdef_flag, template_count, in_namespace,
9145 attrlist, declarator->id_loc);
9146 if (decl == NULL_TREE)
9147 return error_mark_node;
9149 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9150 /* The decl and setting of decl_attr is also turned off. */
9151 decl = build_decl_attribute_variant (decl, decl_attr);
9154 /* [class.conv.ctor]
9156 A constructor declared without the function-specifier
9157 explicit that can be called with a single parameter
9158 specifies a conversion from the type of its first
9159 parameter to the type of its class. Such a constructor
9160 is called a converting constructor. */
9162 DECL_NONCONVERTING_P (decl) = 1;
9164 else if (TREE_CODE (type) == METHOD_TYPE)
9166 /* We only get here for friend declarations of
9167 members of other classes. */
9168 /* All method decls are public, so tell grokfndecl to set
9169 TREE_PUBLIC, also. */
9170 decl = grokfndecl (ctype, type,
9171 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9172 ? unqualified_id : dname,
9175 virtualp, flags, memfn_quals, raises,
9176 friendp ? -1 : 0, friendp, 1, 0, sfk,
9177 funcdef_flag, template_count, in_namespace,
9179 declarator->id_loc);
9180 if (decl == NULL_TREE)
9181 return error_mark_node;
9183 else if (!staticp && !dependent_type_p (type)
9184 && !COMPLETE_TYPE_P (complete_type (type))
9185 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9188 error ("field %qD has incomplete type", unqualified_id);
9190 error ("name %qT has incomplete type", type);
9192 /* If we're instantiating a template, tell them which
9193 instantiation made the field's type be incomplete. */
9194 if (current_class_type
9195 && TYPE_NAME (current_class_type)
9196 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9198 && declspecs->type == type)
9199 error (" in instantiation of template %qT",
9200 current_class_type);
9202 return error_mark_node;
9208 error ("%qE is neither function nor member function; "
9209 "cannot be declared friend", unqualified_id);
9217 /* Friends are treated specially. */
9218 if (ctype == current_class_type)
9219 ; /* We already issued a permerror. */
9220 else if (decl && DECL_NAME (decl))
9222 if (template_class_depth (current_class_type) == 0)
9224 decl = check_explicit_specialization
9225 (unqualified_id, decl, template_count,
9226 2 * funcdef_flag + 4);
9227 if (decl == error_mark_node)
9228 return error_mark_node;
9231 decl = do_friend (ctype, unqualified_id, decl,
9237 return error_mark_node;
9240 /* Structure field. It may not be a function, except for C++. */
9242 if (decl == NULL_TREE)
9248 /* An attempt is being made to initialize a non-static
9249 member. But, from [class.mem]:
9251 4 A member-declarator can contain a
9252 constant-initializer only if it declares a static
9253 member (_class.static_) of integral or enumeration
9254 type, see _class.static.data_.
9256 This used to be relatively common practice, but
9257 the rest of the compiler does not correctly
9258 handle the initialization unless the member is
9259 static so we make it static below. */
9260 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9262 permerror (input_location, "making %qD static", unqualified_id);
9266 if (uses_template_parms (type))
9267 /* We'll check at instantiation time. */
9269 else if (check_static_variable_definition (unqualified_id,
9271 /* If we just return the declaration, crashes
9272 will sometimes occur. We therefore return
9273 void_type_node, as if this was a friend
9274 declaration, to cause callers to completely
9275 ignore this declaration. */
9276 return error_mark_node;
9281 /* C++ allows static class members. All other work
9282 for this is done by grokfield. */
9283 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9284 set_linkage_for_static_data_member (decl);
9285 /* Even if there is an in-class initialization, DECL
9286 is considered undefined until an out-of-class
9287 definition is provided. */
9288 DECL_EXTERNAL (decl) = 1;
9291 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9295 decl = build_decl (input_location,
9296 FIELD_DECL, unqualified_id, type);
9297 DECL_NONADDRESSABLE_P (decl) = bitfield;
9298 if (bitfield && !unqualified_id)
9299 TREE_NO_WARNING (decl) = 1;
9301 if (storage_class == sc_mutable)
9303 DECL_MUTABLE_P (decl) = 1;
9304 storage_class = sc_none;
9308 bad_specifiers (decl, "field", virtualp,
9309 memfn_quals != TYPE_UNQUALIFIED,
9310 inlinep, friendp, raises != NULL_TREE);
9313 else if (TREE_CODE (type) == FUNCTION_TYPE
9314 || TREE_CODE (type) == METHOD_TYPE)
9319 if (!unqualified_id)
9320 return error_mark_node;
9322 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9323 original_name = dname;
9325 original_name = unqualified_id;
9327 if (storage_class == sc_auto)
9328 error ("storage class %<auto%> invalid for function %qs", name);
9329 else if (storage_class == sc_register)
9330 error ("storage class %<register%> invalid for function %qs", name);
9332 error ("storage class %<__thread%> invalid for function %qs", name);
9334 /* Function declaration not at top level.
9335 Storage classes other than `extern' are not allowed
9336 and `extern' makes no difference. */
9337 if (! toplevel_bindings_p ()
9338 && (storage_class == sc_static
9339 || declspecs->specs[(int)ds_inline])
9342 if (storage_class == sc_static)
9343 pedwarn (input_location, OPT_pedantic,
9344 "%<static%> specified invalid for function %qs "
9345 "declared out of global scope", name);
9347 pedwarn (input_location, OPT_pedantic,
9348 "%<inline%> specifier invalid for function %qs "
9349 "declared out of global scope", name);
9352 if (ctype != NULL_TREE
9353 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9355 error ("%q#T is not a class or a namespace", ctype);
9359 if (ctype == NULL_TREE)
9363 error ("virtual non-class function %qs", name);
9366 else if (sfk == sfk_constructor
9367 || sfk == sfk_destructor)
9370 ? "%qs defined in a non-class scope"
9371 : "%qs declared in a non-class scope", name);
9375 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9376 && !NEW_DELETE_OPNAME_P (original_name))
9377 type = build_method_type_directly (ctype,
9379 TYPE_ARG_TYPES (type));
9381 /* Record presence of `static'. */
9382 publicp = (ctype != NULL_TREE
9383 || storage_class == sc_extern
9384 || storage_class != sc_static);
9386 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9387 virtualp, flags, memfn_quals, raises,
9389 publicp, inlinep, sfk, funcdef_flag,
9390 template_count, in_namespace, attrlist,
9391 declarator->id_loc);
9392 if (decl == NULL_TREE)
9393 return error_mark_node;
9397 int invalid_static = 0;
9399 /* Don't allow a static member function in a class, and forbid
9400 declaring main to be static. */
9401 if (TREE_CODE (type) == METHOD_TYPE)
9403 permerror (input_location, "cannot declare member function %qD to have "
9404 "static linkage", decl);
9407 else if (current_function_decl)
9409 /* FIXME need arm citation */
9410 error ("cannot declare static function inside another function");
9417 storage_class = sc_none;
9423 /* It's a variable. */
9425 /* An uninitialized decl with `extern' is a reference. */
9426 decl = grokvardecl (type, unqualified_id,
9429 (type_quals & TYPE_QUAL_CONST) != 0,
9430 ctype ? ctype : in_namespace);
9431 bad_specifiers (decl, "variable", virtualp,
9432 memfn_quals != TYPE_UNQUALIFIED,
9433 inlinep, friendp, raises != NULL_TREE);
9437 DECL_CONTEXT (decl) = ctype;
9440 permerror (input_location, "%<static%> may not be used when defining "
9441 "(as opposed to declaring) a static data member");
9443 storage_class = sc_none;
9445 if (storage_class == sc_register && TREE_STATIC (decl))
9447 error ("static member %qD declared %<register%>", decl);
9448 storage_class = sc_none;
9450 if (storage_class == sc_extern && pedantic)
9452 pedwarn (input_location, OPT_pedantic,
9453 "cannot explicitly declare member %q#D to have "
9454 "extern linkage", decl);
9455 storage_class = sc_none;
9460 if (storage_class == sc_extern && initialized && !funcdef_flag)
9462 if (toplevel_bindings_p ())
9464 /* It's common practice (and completely valid) to have a const
9465 be initialized and declared extern. */
9466 if (!(type_quals & TYPE_QUAL_CONST))
9467 warning (0, "%qs initialized and declared %<extern%>", name);
9471 error ("%qs has both %<extern%> and initializer", name);
9472 return error_mark_node;
9476 /* Record `register' declaration for warnings on &
9477 and in case doing stupid register allocation. */
9479 if (storage_class == sc_register)
9480 DECL_REGISTER (decl) = 1;
9481 else if (storage_class == sc_extern)
9482 DECL_THIS_EXTERN (decl) = 1;
9483 else if (storage_class == sc_static)
9484 DECL_THIS_STATIC (decl) = 1;
9486 /* Record constancy and volatility on the DECL itself . There's
9487 no need to do this when processing a template; we'll do this
9488 for the instantiated declaration based on the type of DECL. */
9489 if (!processing_template_decl)
9490 cp_apply_type_quals_to_decl (type_quals, decl);
9496 /* Subroutine of start_function. Ensure that each of the parameter
9497 types (as listed in PARMS) is complete, as is required for a
9498 function definition. */
9501 require_complete_types_for_parms (tree parms)
9503 for (; parms; parms = TREE_CHAIN (parms))
9505 if (dependent_type_p (TREE_TYPE (parms)))
9507 if (!VOID_TYPE_P (TREE_TYPE (parms))
9508 && complete_type_or_else (TREE_TYPE (parms), parms))
9510 relayout_decl (parms);
9511 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9514 /* grokparms or complete_type_or_else will have already issued
9516 TREE_TYPE (parms) = error_mark_node;
9520 /* Returns nonzero if T is a local variable. */
9523 local_variable_p (const_tree t)
9525 if ((TREE_CODE (t) == VAR_DECL
9526 /* A VAR_DECL with a context that is a _TYPE is a static data
9528 && !TYPE_P (CP_DECL_CONTEXT (t))
9529 /* Any other non-local variable must be at namespace scope. */
9530 && !DECL_NAMESPACE_SCOPE_P (t))
9531 || (TREE_CODE (t) == PARM_DECL))
9537 /* Like local_variable_p, but suitable for use as a tree-walking
9541 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9542 void *data ATTRIBUTE_UNUSED)
9544 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9546 else if (TYPE_P (*tp))
9553 /* Check that ARG, which is a default-argument expression for a
9554 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9555 something goes wrong. DECL may also be a _TYPE node, rather than a
9556 DECL, if there is no DECL available. */
9559 check_default_argument (tree decl, tree arg)
9564 if (TREE_CODE (arg) == DEFAULT_ARG)
9565 /* We get a DEFAULT_ARG when looking at an in-class declaration
9566 with a default argument. Ignore the argument for now; we'll
9567 deal with it after the class is complete. */
9576 decl_type = TREE_TYPE (decl);
9578 if (arg == error_mark_node
9579 || decl == error_mark_node
9580 || TREE_TYPE (arg) == error_mark_node
9581 || decl_type == error_mark_node)
9582 /* Something already went wrong. There's no need to check
9584 return error_mark_node;
9586 /* [dcl.fct.default]
9588 A default argument expression is implicitly converted to the
9590 if (!TREE_TYPE (arg)
9591 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9594 error ("default argument for %q#D has type %qT",
9595 decl, TREE_TYPE (arg));
9597 error ("default argument for parameter of type %qT has type %qT",
9598 decl_type, TREE_TYPE (arg));
9600 return error_mark_node;
9603 /* [dcl.fct.default]
9605 Local variables shall not be used in default argument
9608 The keyword `this' shall not be used in a default argument of a
9610 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9613 error ("default argument %qE uses local variable %qD", arg, var);
9614 return error_mark_node;
9621 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9624 type_is_deprecated (tree type)
9626 enum tree_code code;
9627 if (TREE_DEPRECATED (type))
9629 if (TYPE_NAME (type)
9630 && TREE_DEPRECATED (TYPE_NAME (type)))
9633 code = TREE_CODE (type);
9635 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9636 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9637 || code == METHOD_TYPE || code == ARRAY_TYPE)
9638 return type_is_deprecated (TREE_TYPE (type));
9640 if (TYPE_PTRMEMFUNC_P (type))
9641 return type_is_deprecated
9642 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9647 /* Decode the list of parameter types for a function type.
9648 Given the list of things declared inside the parens,
9649 return a list of types.
9651 If this parameter does not end with an ellipsis, we append
9654 *PARMS is set to the chain of PARM_DECLs created. */
9657 grokparms (tree parmlist, tree *parms)
9659 tree result = NULL_TREE;
9660 tree decls = NULL_TREE;
9664 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9666 tree type = NULL_TREE;
9667 tree init = TREE_PURPOSE (parm);
9668 tree decl = TREE_VALUE (parm);
9671 if (parm == void_list_node)
9674 if (! decl || TREE_TYPE (decl) == error_mark_node)
9677 type = TREE_TYPE (decl);
9678 if (VOID_TYPE_P (type))
9680 if (same_type_p (type, void_type_node)
9681 && DECL_SELF_REFERENCE_P (type)
9682 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9683 /* this is a parmlist of `(void)', which is ok. */
9685 cxx_incomplete_type_error (decl, type);
9686 /* It's not a good idea to actually create parameters of
9687 type `void'; other parts of the compiler assume that a
9688 void type terminates the parameter list. */
9689 type = error_mark_node;
9690 TREE_TYPE (decl) = error_mark_node;
9693 if (type != error_mark_node
9694 && TYPE_FOR_JAVA (type)
9695 && MAYBE_CLASS_TYPE_P (type))
9697 error ("parameter %qD has Java class type", decl);
9698 type = error_mark_node;
9699 TREE_TYPE (decl) = error_mark_node;
9703 if (type != error_mark_node
9704 && (errmsg = targetm.invalid_parameter_type (type)))
9707 type = error_mark_node;
9708 TREE_TYPE (decl) = error_mark_node;
9711 if (type != error_mark_node)
9713 if (deprecated_state != DEPRECATED_SUPPRESS)
9715 tree deptype = type_is_deprecated (type);
9717 warn_deprecated_use (deptype, NULL_TREE);
9720 /* Top-level qualifiers on the parameters are
9721 ignored for function types. */
9722 type = cp_build_qualified_type (type, 0);
9723 if (TREE_CODE (type) == METHOD_TYPE)
9725 error ("parameter %qD invalidly declared method type", decl);
9726 type = build_pointer_type (type);
9727 TREE_TYPE (decl) = type;
9729 else if (abstract_virtuals_error (decl, type))
9730 any_error = 1; /* Seems like a good idea. */
9731 else if (POINTER_TYPE_P (type))
9733 /* [dcl.fct]/6, parameter types cannot contain pointers
9734 (references) to arrays of unknown bound. */
9735 tree t = TREE_TYPE (type);
9736 int ptr = TYPE_PTR_P (type);
9742 else if (TREE_CODE (t) != ARRAY_TYPE)
9744 else if (!TYPE_DOMAIN (t))
9748 if (TREE_CODE (t) == ARRAY_TYPE)
9749 error ("parameter %qD includes %s to array of unknown "
9751 decl, ptr ? "pointer" : "reference", t);
9756 else if (init && !processing_template_decl)
9757 init = check_default_argument (decl, init);
9760 if (TREE_CODE (decl) == PARM_DECL
9761 && FUNCTION_PARAMETER_PACK_P (decl)
9762 && TREE_CHAIN (parm)
9763 && TREE_CHAIN (parm) != void_list_node)
9764 error ("parameter packs must be at the end of the parameter list");
9766 TREE_CHAIN (decl) = decls;
9768 result = tree_cons (init, type, result);
9770 decls = nreverse (decls);
9771 result = nreverse (result);
9773 result = chainon (result, void_list_node);
9780 /* D is a constructor or overloaded `operator='.
9782 Let T be the class in which D is declared. Then, this function
9785 -1 if D's is an ill-formed constructor or copy assignment operator
9786 whose first parameter is of type `T'.
9787 0 if D is not a copy constructor or copy assignment
9789 1 if D is a copy constructor or copy assignment operator whose
9790 first parameter is a reference to const qualified T.
9791 2 if D is a copy constructor or copy assignment operator whose
9792 first parameter is a reference to non-const qualified T.
9794 This function can be used as a predicate. Positive values indicate
9795 a copy constructor and nonzero values indicate a copy assignment
9799 copy_fn_p (const_tree d)
9805 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9807 if (TREE_CODE (d) == TEMPLATE_DECL
9808 || (DECL_TEMPLATE_INFO (d)
9809 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9810 /* Instantiations of template member functions are never copy
9811 functions. Note that member functions of templated classes are
9812 represented as template functions internally, and we must
9813 accept those as copy functions. */
9816 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9820 arg_type = TREE_VALUE (args);
9821 if (arg_type == error_mark_node)
9824 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9826 /* Pass by value copy assignment operator. */
9829 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9830 && !TYPE_REF_IS_RVALUE (arg_type)
9831 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9833 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9839 args = TREE_CHAIN (args);
9841 if (args && args != void_list_node && !TREE_PURPOSE (args))
9842 /* There are more non-optional args. */
9848 /* D is a constructor or overloaded `operator='.
9850 Let T be the class in which D is declared. Then, this function
9851 returns true when D is a move constructor or move assignment
9852 operator, false otherwise. */
9855 move_fn_p (const_tree d)
9859 bool result = false;
9861 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9863 if (cxx_dialect == cxx98)
9864 /* There are no move constructors if we are in C++98 mode. */
9867 if (TREE_CODE (d) == TEMPLATE_DECL
9868 || (DECL_TEMPLATE_INFO (d)
9869 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9870 /* Instantiations of template member functions are never copy
9871 functions. Note that member functions of templated classes are
9872 represented as template functions internally, and we must
9873 accept those as copy functions. */
9876 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9880 arg_type = TREE_VALUE (args);
9881 if (arg_type == error_mark_node)
9884 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9885 && TYPE_REF_IS_RVALUE (arg_type)
9886 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9890 args = TREE_CHAIN (args);
9892 if (args && args != void_list_node && !TREE_PURPOSE (args))
9893 /* There are more non-optional args. */
9899 /* Remember any special properties of member function DECL. */
9902 grok_special_member_properties (tree decl)
9906 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9909 class_type = DECL_CONTEXT (decl);
9910 if (DECL_CONSTRUCTOR_P (decl))
9912 int ctor = copy_fn_p (decl);
9914 if (!DECL_ARTIFICIAL (decl))
9915 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9921 A non-template constructor for class X is a copy
9922 constructor if its first parameter is of type X&, const
9923 X&, volatile X& or const volatile X&, and either there
9924 are no other parameters or else all other parameters have
9925 default arguments. */
9926 TYPE_HAS_INIT_REF (class_type) = 1;
9927 if (!DECL_DEFAULTED_FN (decl))
9928 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9930 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9932 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9934 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9935 if (TREE_CODE (decl) == TEMPLATE_DECL || !DECL_DEFAULTED_FN (decl))
9936 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
9938 else if (is_list_ctor (decl))
9939 TYPE_HAS_LIST_CTOR (class_type) = 1;
9941 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9945 A non-template assignment operator for class X is a copy
9946 assignment operator if its parameter is of type X, X&, const
9947 X&, volatile X& or const volatile X&. */
9949 int assop = copy_fn_p (decl);
9953 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9954 if (!DECL_DEFAULTED_FN (decl))
9955 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9957 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9962 /* Check a constructor DECL has the correct form. Complains
9963 if the class has a constructor of the form X(X). */
9966 grok_ctor_properties (const_tree ctype, const_tree decl)
9968 int ctor_parm = copy_fn_p (decl);
9974 A declaration of a constructor for a class X is ill-formed if
9975 its first parameter is of type (optionally cv-qualified) X
9976 and either there are no other parameters or else all other
9977 parameters have default arguments.
9979 We *don't* complain about member template instantiations that
9980 have this form, though; they can occur as we try to decide
9981 what constructor to use during overload resolution. Since
9982 overload resolution will never prefer such a constructor to
9983 the non-template copy constructor (which is either explicitly
9984 or implicitly defined), there's no need to worry about their
9985 existence. Theoretically, they should never even be
9986 instantiated, but that's hard to forestall. */
9987 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9995 /* An operator with this code is unary, but can also be binary. */
9998 ambi_op_p (enum tree_code code)
10000 return (code == INDIRECT_REF
10001 || code == ADDR_EXPR
10002 || code == UNARY_PLUS_EXPR
10003 || code == NEGATE_EXPR
10004 || code == PREINCREMENT_EXPR
10005 || code == PREDECREMENT_EXPR);
10008 /* An operator with this name can only be unary. */
10011 unary_op_p (enum tree_code code)
10013 return (code == TRUTH_NOT_EXPR
10014 || code == BIT_NOT_EXPR
10015 || code == COMPONENT_REF
10016 || code == TYPE_EXPR);
10019 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10020 errors are issued for invalid declarations. */
10023 grok_op_properties (tree decl, bool complain)
10025 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10027 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10028 tree name = DECL_NAME (decl);
10029 enum tree_code operator_code;
10034 /* Count the number of arguments and check for ellipsis. */
10035 for (argtype = argtypes, arity = 0;
10036 argtype && argtype != void_list_node;
10037 argtype = TREE_CHAIN (argtype))
10039 ellipsis_p = !argtype;
10041 class_type = DECL_CONTEXT (decl);
10042 if (class_type && !CLASS_TYPE_P (class_type))
10043 class_type = NULL_TREE;
10045 if (DECL_CONV_FN_P (decl))
10046 operator_code = TYPE_EXPR;
10050 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10051 if (ansi_opname (CODE) == name) \
10053 operator_code = (CODE); \
10056 else if (ansi_assopname (CODE) == name) \
10058 operator_code = (CODE); \
10059 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10063 #include "operators.def"
10064 #undef DEF_OPERATOR
10066 gcc_unreachable ();
10069 gcc_assert (operator_code != MAX_TREE_CODES);
10070 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10073 switch (operator_code)
10076 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10080 TYPE_GETS_DELETE (class_type) |= 1;
10084 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10087 case VEC_DELETE_EXPR:
10088 TYPE_GETS_DELETE (class_type) |= 2;
10095 /* [basic.std.dynamic.allocation]/1:
10097 A program is ill-formed if an allocation function is declared
10098 in a namespace scope other than global scope or declared static
10101 The same also holds true for deallocation functions. */
10102 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10103 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10105 if (DECL_NAMESPACE_SCOPE_P (decl))
10107 if (CP_DECL_CONTEXT (decl) != global_namespace)
10109 error ("%qD may not be declared within a namespace", decl);
10112 else if (!TREE_PUBLIC (decl))
10114 error ("%qD may not be declared as static", decl);
10120 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10122 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10123 DECL_IS_OPERATOR_NEW (decl) = 1;
10125 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10126 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10129 /* An operator function must either be a non-static member function
10130 or have at least one parameter of a class, a reference to a class,
10131 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10132 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10134 if (operator_code == TYPE_EXPR
10135 || operator_code == CALL_EXPR
10136 || operator_code == COMPONENT_REF
10137 || operator_code == ARRAY_REF
10138 || operator_code == NOP_EXPR)
10140 error ("%qD must be a nonstatic member function", decl);
10147 if (DECL_STATIC_FUNCTION_P (decl))
10149 error ("%qD must be either a non-static member "
10150 "function or a non-member function", decl);
10154 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10156 tree arg = non_reference (TREE_VALUE (p));
10157 if (arg == error_mark_node)
10160 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10161 because these checks are performed even on
10162 template functions. */
10163 if (MAYBE_CLASS_TYPE_P (arg)
10164 || TREE_CODE (arg) == ENUMERAL_TYPE)
10168 if (!p || p == void_list_node)
10171 error ("%qD must have an argument of class or "
10172 "enumerated type", decl);
10178 /* There are no restrictions on the arguments to an overloaded
10180 if (operator_code == CALL_EXPR)
10183 /* Warn about conversion operators that will never be used. */
10184 if (IDENTIFIER_TYPENAME_P (name)
10185 && ! DECL_TEMPLATE_INFO (decl)
10187 /* Warn only declaring the function; there is no need to
10188 warn again about out-of-class definitions. */
10189 && class_type == current_class_type)
10191 tree t = TREE_TYPE (name);
10192 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10193 const char *what = 0;
10196 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10198 if (TREE_CODE (t) == VOID_TYPE)
10200 else if (class_type)
10202 if (t == class_type)
10203 what = "the same type";
10204 /* Don't force t to be complete here. */
10205 else if (MAYBE_CLASS_TYPE_P (t)
10206 && COMPLETE_TYPE_P (t)
10207 && DERIVED_FROM_P (t, class_type))
10208 what = "a base class";
10212 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10213 "conversion operator",
10214 ref ? "a reference to " : "", what);
10217 if (operator_code == COND_EXPR)
10220 error ("ISO C++ prohibits overloading operator ?:");
10223 else if (ellipsis_p)
10225 error ("%qD must not have variable number of arguments", decl);
10228 else if (ambi_op_p (operator_code))
10231 /* We pick the one-argument operator codes by default, so
10232 we don't have to change anything. */
10234 else if (arity == 2)
10236 /* If we thought this was a unary operator, we now know
10237 it to be a binary operator. */
10238 switch (operator_code)
10241 operator_code = MULT_EXPR;
10245 operator_code = BIT_AND_EXPR;
10248 case UNARY_PLUS_EXPR:
10249 operator_code = PLUS_EXPR;
10253 operator_code = MINUS_EXPR;
10256 case PREINCREMENT_EXPR:
10257 operator_code = POSTINCREMENT_EXPR;
10260 case PREDECREMENT_EXPR:
10261 operator_code = POSTDECREMENT_EXPR;
10265 gcc_unreachable ();
10268 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10270 if ((operator_code == POSTINCREMENT_EXPR
10271 || operator_code == POSTDECREMENT_EXPR)
10272 && ! processing_template_decl
10273 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10276 error ("postfix %qD must take %<int%> as its argument",
10279 error ("postfix %qD must take %<int%> as its second "
10287 error ("%qD must take either zero or one argument", decl);
10289 error ("%qD must take either one or two arguments", decl);
10293 /* More Effective C++ rule 6. */
10295 && (operator_code == POSTINCREMENT_EXPR
10296 || operator_code == POSTDECREMENT_EXPR
10297 || operator_code == PREINCREMENT_EXPR
10298 || operator_code == PREDECREMENT_EXPR))
10300 tree arg = TREE_VALUE (argtypes);
10301 tree ret = TREE_TYPE (TREE_TYPE (decl));
10302 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10303 arg = TREE_TYPE (arg);
10304 arg = TYPE_MAIN_VARIANT (arg);
10305 if (operator_code == PREINCREMENT_EXPR
10306 || operator_code == PREDECREMENT_EXPR)
10308 if (TREE_CODE (ret) != REFERENCE_TYPE
10309 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10311 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10312 build_reference_type (arg));
10316 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10317 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10321 else if (unary_op_p (operator_code))
10326 error ("%qD must take %<void%>", decl);
10328 error ("%qD must take exactly one argument", decl);
10332 else /* if (binary_op_p (operator_code)) */
10337 error ("%qD must take exactly one argument", decl);
10339 error ("%qD must take exactly two arguments", decl);
10343 /* More Effective C++ rule 7. */
10345 && (operator_code == TRUTH_ANDIF_EXPR
10346 || operator_code == TRUTH_ORIF_EXPR
10347 || operator_code == COMPOUND_EXPR))
10348 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10352 /* Effective C++ rule 23. */
10355 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10356 && (operator_code == PLUS_EXPR
10357 || operator_code == MINUS_EXPR
10358 || operator_code == TRUNC_DIV_EXPR
10359 || operator_code == MULT_EXPR
10360 || operator_code == TRUNC_MOD_EXPR)
10361 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10362 warning (OPT_Weffc__, "%qD should return by value", decl);
10364 /* [over.oper]/8 */
10365 for (; argtypes && argtypes != void_list_node;
10366 argtypes = TREE_CHAIN (argtypes))
10367 if (TREE_PURPOSE (argtypes))
10369 TREE_PURPOSE (argtypes) = NULL_TREE;
10370 if (operator_code == POSTINCREMENT_EXPR
10371 || operator_code == POSTDECREMENT_EXPR)
10373 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10378 error ("%qD cannot have default arguments", decl);
10386 /* Return a string giving the keyword associate with CODE. */
10388 static const char *
10389 tag_name (enum tag_types code)
10401 case typename_type:
10404 gcc_unreachable ();
10408 /* Name lookup in an elaborated-type-specifier (after the keyword
10409 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10410 elaborated-type-specifier is invalid, issue a diagnostic and return
10411 error_mark_node; otherwise, return the *_TYPE to which it referred.
10412 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10415 check_elaborated_type_specifier (enum tag_types tag_code,
10417 bool allow_template_p)
10423 struct S { struct S *p; };
10425 name lookup will find the TYPE_DECL for the implicit "S::S"
10426 typedef. Adjust for that here. */
10427 if (DECL_SELF_REFERENCE_P (decl))
10428 decl = TYPE_NAME (TREE_TYPE (decl));
10430 type = TREE_TYPE (decl);
10432 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10433 is false for this case as well. */
10434 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10436 error ("using template type parameter %qT after %qs",
10437 type, tag_name (tag_code));
10438 return error_mark_node;
10442 If the identifier resolves to a typedef-name or a template
10443 type-parameter, the elaborated-type-specifier is ill-formed.
10445 In other words, the only legitimate declaration to use in the
10446 elaborated type specifier is the implicit typedef created when
10447 the type is declared. */
10448 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10449 && tag_code != typename_type)
10451 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10452 error ("%q+D has a previous declaration here", decl);
10453 return error_mark_node;
10455 else if (TREE_CODE (type) != RECORD_TYPE
10456 && TREE_CODE (type) != UNION_TYPE
10457 && tag_code != enum_type
10458 && tag_code != typename_type)
10460 error ("%qT referred to as %qs", type, tag_name (tag_code));
10461 error ("%q+T has a previous declaration here", type);
10462 return error_mark_node;
10464 else if (TREE_CODE (type) != ENUMERAL_TYPE
10465 && tag_code == enum_type)
10467 error ("%qT referred to as enum", type);
10468 error ("%q+T has a previous declaration here", type);
10469 return error_mark_node;
10471 else if (!allow_template_p
10472 && TREE_CODE (type) == RECORD_TYPE
10473 && CLASSTYPE_IS_TEMPLATE (type))
10475 /* If a class template appears as elaborated type specifier
10476 without a template header such as:
10478 template <class T> class C {};
10479 void f(class C); // No template header here
10481 then the required template argument is missing. */
10482 error ("template argument required for %<%s %T%>",
10483 tag_name (tag_code),
10484 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10485 return error_mark_node;
10491 /* Lookup NAME in elaborate type specifier in scope according to
10492 SCOPE and issue diagnostics if necessary.
10493 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10494 found, and ERROR_MARK_NODE for type error. */
10497 lookup_and_check_tag (enum tag_types tag_code, tree name,
10498 tag_scope scope, bool template_header_p)
10502 if (scope == ts_global)
10504 /* First try ordinary name lookup, ignoring hidden class name
10505 injected via friend declaration. */
10506 decl = lookup_name_prefer_type (name, 2);
10507 /* If that fails, the name will be placed in the smallest
10508 non-class, non-function-prototype scope according to 3.3.1/5.
10509 We may already have a hidden name declared as friend in this
10510 scope. So lookup again but not ignoring hidden names.
10511 If we find one, that name will be made visible rather than
10512 creating a new tag. */
10514 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10517 decl = lookup_type_scope (name, scope);
10519 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10520 decl = DECL_TEMPLATE_RESULT (decl);
10522 if (decl && TREE_CODE (decl) == TYPE_DECL)
10524 /* Look for invalid nested type:
10528 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10530 error ("%qD has the same name as the class in which it is "
10533 return error_mark_node;
10536 /* Two cases we need to consider when deciding if a class
10537 template is allowed as an elaborated type specifier:
10538 1. It is a self reference to its own class.
10539 2. It comes with a template header.
10543 template <class T> class C {
10544 class C *c1; // DECL_SELF_REFERENCE_P is true
10547 template <class U> class C; // template_header_p is true
10548 template <class T> class C<T>::D {
10549 class C *c2; // DECL_SELF_REFERENCE_P is true
10552 t = check_elaborated_type_specifier (tag_code,
10555 | DECL_SELF_REFERENCE_P (decl));
10558 else if (decl && TREE_CODE (decl) == TREE_LIST)
10560 error ("reference to %qD is ambiguous", name);
10561 print_candidates (decl);
10562 return error_mark_node;
10568 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10569 Define the tag as a forward-reference if it is not defined.
10571 If a declaration is given, process it here, and report an error if
10572 multiple declarations are not identical.
10574 SCOPE is TS_CURRENT when this is also a definition. Only look in
10575 the current frame for the name (since C++ allows new names in any
10576 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10577 declaration. Only look beginning from the current scope outward up
10578 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10580 TEMPLATE_HEADER_P is true when this declaration is preceded by
10581 a set of template parameters. */
10584 xref_tag (enum tag_types tag_code, tree name,
10585 tag_scope scope, bool template_header_p)
10587 enum tree_code code;
10589 tree context = NULL_TREE;
10591 timevar_push (TV_NAME_LOOKUP);
10593 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10599 code = RECORD_TYPE;
10605 code = ENUMERAL_TYPE;
10608 gcc_unreachable ();
10611 /* In case of anonymous name, xref_tag is only called to
10612 make type node and push name. Name lookup is not required. */
10613 if (ANON_AGGRNAME_P (name))
10616 t = lookup_and_check_tag (tag_code, name,
10617 scope, template_header_p);
10619 if (t == error_mark_node)
10620 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10622 if (scope != ts_current && t && current_class_type
10623 && template_class_depth (current_class_type)
10624 && template_header_p)
10626 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10627 definition of this tag. Since, in addition, we are currently
10628 processing a (member) template declaration of a template
10629 class, we must be very careful; consider:
10636 { template <class V>
10637 friend struct S1; };
10639 Here, the S2::S1 declaration should not be confused with the
10640 outer declaration. In particular, the inner version should
10641 have a template parameter of level 2, not level 1. This
10642 would be particularly important if the member declaration
10645 template <class V = U> friend struct S1;
10647 say, when we should tsubst into `U' when instantiating
10648 S2. On the other hand, when presented with:
10658 we must find the inner binding eventually. We
10659 accomplish this by making sure that the new type we
10660 create to represent this declaration has the right
10662 context = TYPE_CONTEXT (t);
10668 /* If no such tag is yet defined, create a forward-reference node
10669 and record it as the "definition".
10670 When a real declaration of this type is found,
10671 the forward-reference will be altered into a real type. */
10672 if (code == ENUMERAL_TYPE)
10674 error ("use of enum %q#D without previous declaration", name);
10675 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10679 t = make_class_type (code);
10680 TYPE_CONTEXT (t) = context;
10681 t = pushtag (name, t, scope);
10686 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10688 if (!redeclare_class_template (t, current_template_parms))
10689 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10691 else if (!processing_template_decl
10692 && CLASS_TYPE_P (t)
10693 && CLASSTYPE_IS_TEMPLATE (t))
10695 error ("redeclaration of %qT as a non-template", t);
10696 error ("previous declaration %q+D", t);
10697 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10700 /* Make injected friend class visible. */
10701 if (scope != ts_within_enclosing_non_class
10702 && hidden_name_p (TYPE_NAME (t)))
10704 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10705 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10707 if (TYPE_TEMPLATE_INFO (t))
10709 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10710 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10715 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10719 xref_tag_from_type (tree old, tree id, tag_scope scope)
10721 enum tag_types tag_kind;
10723 if (TREE_CODE (old) == RECORD_TYPE)
10724 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10726 tag_kind = union_type;
10728 if (id == NULL_TREE)
10729 id = TYPE_IDENTIFIER (old);
10731 return xref_tag (tag_kind, id, scope, false);
10734 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10735 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10736 access_* node, and the TREE_VALUE is the type of the base-class.
10737 Non-NULL TREE_TYPE indicates virtual inheritance.
10739 Returns true if the binfo hierarchy was successfully created,
10740 false if an error was detected. */
10743 xref_basetypes (tree ref, tree base_list)
10746 tree binfo, base_binfo;
10747 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10748 unsigned max_bases = 0; /* Maximum direct bases. */
10750 tree default_access;
10751 tree igo_prev; /* Track Inheritance Graph Order. */
10753 if (ref == error_mark_node)
10756 /* The base of a derived class is private by default, all others are
10758 default_access = (TREE_CODE (ref) == RECORD_TYPE
10759 && CLASSTYPE_DECLARED_CLASS (ref)
10760 ? access_private_node : access_public_node);
10762 /* First, make sure that any templates in base-classes are
10763 instantiated. This ensures that if we call ourselves recursively
10764 we do not get confused about which classes are marked and which
10766 basep = &base_list;
10769 tree basetype = TREE_VALUE (*basep);
10771 if (!(processing_template_decl && uses_template_parms (basetype))
10772 && !complete_type_or_else (basetype, NULL))
10773 /* An incomplete type. Remove it from the list. */
10774 *basep = TREE_CHAIN (*basep);
10778 if (TREE_TYPE (*basep))
10780 if (CLASS_TYPE_P (basetype))
10781 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10782 basep = &TREE_CHAIN (*basep);
10786 TYPE_MARKED_P (ref) = 1;
10788 /* The binfo slot should be empty, unless this is an (ill-formed)
10790 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10791 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10793 binfo = make_tree_binfo (max_bases);
10795 TYPE_BINFO (ref) = binfo;
10796 BINFO_OFFSET (binfo) = size_zero_node;
10797 BINFO_TYPE (binfo) = ref;
10799 /* Apply base-class info set up to the variants of this type. */
10800 fixup_type_variants (ref);
10804 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10805 /* An aggregate cannot have baseclasses. */
10806 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10808 if (TREE_CODE (ref) == UNION_TYPE)
10810 error ("derived union %qT invalid", ref);
10817 if (TYPE_FOR_JAVA (ref))
10819 error ("Java class %qT cannot have multiple bases", ref);
10826 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10828 if (TYPE_FOR_JAVA (ref))
10830 error ("Java class %qT cannot have virtual bases", ref);
10835 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10837 tree access = TREE_PURPOSE (base_list);
10838 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10839 tree basetype = TREE_VALUE (base_list);
10841 if (access == access_default_node)
10842 access = default_access;
10844 if (PACK_EXPANSION_P (basetype))
10845 basetype = PACK_EXPANSION_PATTERN (basetype);
10846 if (TREE_CODE (basetype) == TYPE_DECL)
10847 basetype = TREE_TYPE (basetype);
10848 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10850 error ("base type %qT fails to be a struct or class type",
10855 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10856 TYPE_FOR_JAVA (ref) = 1;
10858 base_binfo = NULL_TREE;
10859 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10861 base_binfo = TYPE_BINFO (basetype);
10862 /* The original basetype could have been a typedef'd type. */
10863 basetype = BINFO_TYPE (base_binfo);
10865 /* Inherit flags from the base. */
10866 TYPE_HAS_NEW_OPERATOR (ref)
10867 |= TYPE_HAS_NEW_OPERATOR (basetype);
10868 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10869 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10870 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10871 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10872 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10873 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10874 CLASSTYPE_REPEATED_BASE_P (ref)
10875 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10878 /* We must do this test after we've seen through a typedef
10880 if (TYPE_MARKED_P (basetype))
10882 if (basetype == ref)
10883 error ("recursive type %qT undefined", basetype);
10885 error ("duplicate base type %qT invalid", basetype);
10889 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10890 /* Regenerate the pack expansion for the bases. */
10891 basetype = make_pack_expansion (basetype);
10893 TYPE_MARKED_P (basetype) = 1;
10895 base_binfo = copy_binfo (base_binfo, basetype, ref,
10896 &igo_prev, via_virtual);
10897 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10898 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10900 BINFO_BASE_APPEND (binfo, base_binfo);
10901 BINFO_BASE_ACCESS_APPEND (binfo, access);
10904 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10905 /* If we have space in the vbase vector, we must have shared at
10906 least one of them, and are therefore diamond shaped. */
10907 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10909 /* Unmark all the types. */
10910 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10911 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10912 TYPE_MARKED_P (ref) = 0;
10914 /* Now see if we have a repeated base type. */
10915 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10917 for (base_binfo = binfo; base_binfo;
10918 base_binfo = TREE_CHAIN (base_binfo))
10920 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10922 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10925 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10927 for (base_binfo = binfo; base_binfo;
10928 base_binfo = TREE_CHAIN (base_binfo))
10929 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10930 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10939 /* Begin compiling the definition of an enumeration type.
10942 UNDERLYING_TYPE is the type that will be used as the storage for
10943 the enumeration type. This should be NULL_TREE if no storage type
10946 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10948 Returns the type object, as yet incomplete.
10949 Also records info about it so that build_enumerator
10950 may be used to declare the individual values as they are read. */
10953 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10957 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10959 /* If this is the real definition for a previous forward reference,
10960 fill in the contents in the same object that used to be the
10961 forward reference. */
10963 enumtype = lookup_and_check_tag (enum_type, name,
10964 /*tag_scope=*/ts_current,
10965 /*template_header_p=*/false);
10967 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10969 error_at (input_location, "multiple definition of %q#T", enumtype);
10970 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
10971 "previous definition here");
10972 /* Clear out TYPE_VALUES, and start again. */
10973 TYPE_VALUES (enumtype) = NULL_TREE;
10977 /* In case of error, make a dummy enum to allow parsing to
10979 if (enumtype == error_mark_node)
10980 name = make_anon_name ();
10982 enumtype = make_node (ENUMERAL_TYPE);
10983 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10986 if (enumtype == error_mark_node)
10991 SET_SCOPED_ENUM_P (enumtype, 1);
10992 begin_scope (sk_scoped_enum, enumtype);
10994 /* [C++0x dcl.enum]p5:
10996 If not explicitly specified, the underlying type of a scoped
10997 enumeration type is int. */
10998 if (!underlying_type)
10999 underlying_type = integer_type_node;
11002 if (underlying_type)
11004 if (CP_INTEGRAL_TYPE_P (underlying_type))
11006 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11007 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11008 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11009 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11010 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11011 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11012 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11013 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11014 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11015 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11017 else if (!dependent_type_p (underlying_type))
11018 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11019 underlying_type, enumtype);
11025 /* After processing and defining all the values of an enumeration type,
11026 install their decls in the enumeration type and finish it off.
11027 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11030 finish_enum (tree enumtype)
11039 bool use_short_enum;
11044 tree underlying_type = NULL_TREE;
11045 bool fixed_underlying_type_p
11046 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11048 /* We built up the VALUES in reverse order. */
11049 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11051 /* For an enum defined in a template, just set the type of the values;
11052 all further processing is postponed until the template is
11053 instantiated. We need to set the type so that tsubst of a CONST_DECL
11055 if (processing_template_decl)
11057 for (values = TYPE_VALUES (enumtype);
11059 values = TREE_CHAIN (values))
11060 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11061 if (at_function_scope_p ())
11062 add_stmt (build_min (TAG_DEFN, enumtype));
11063 if (SCOPED_ENUM_P (enumtype))
11068 /* Determine the minimum and maximum values of the enumerators. */
11069 if (TYPE_VALUES (enumtype))
11071 minnode = maxnode = NULL_TREE;
11073 for (values = TYPE_VALUES (enumtype);
11075 values = TREE_CHAIN (values))
11077 decl = TREE_VALUE (values);
11079 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11080 each enumerator has the type of its enumeration. Prior to the
11081 closing brace, the type of each enumerator is the type of its
11082 initializing value. */
11083 TREE_TYPE (decl) = enumtype;
11085 /* Update the minimum and maximum values, if appropriate. */
11086 value = DECL_INITIAL (decl);
11087 if (value == error_mark_node)
11088 value = integer_zero_node;
11089 /* Figure out what the minimum and maximum values of the
11090 enumerators are. */
11092 minnode = maxnode = value;
11093 else if (tree_int_cst_lt (maxnode, value))
11095 else if (tree_int_cst_lt (value, minnode))
11102 If the enumerator-list is empty, the underlying type is as if
11103 the enumeration had a single enumerator with value 0. */
11104 minnode = maxnode = integer_zero_node;
11106 /* Compute the number of bits require to represent all values of the
11107 enumeration. We must do this before the type of MINNODE and
11108 MAXNODE are transformed, since tree_int_cst_min_precision relies
11109 on the TREE_TYPE of the value it is passed. */
11110 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11111 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11112 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11113 precision = MAX (lowprec, highprec);
11115 if (!fixed_underlying_type_p)
11117 /* Determine the underlying type of the enumeration.
11121 The underlying type of an enumeration is an integral type that
11122 can represent all the enumerator values defined in the
11123 enumeration. It is implementation-defined which integral type is
11124 used as the underlying type for an enumeration except that the
11125 underlying type shall not be larger than int unless the value of
11126 an enumerator cannot fit in an int or unsigned int.
11128 We use "int" or an "unsigned int" as the underlying type, even if
11129 a smaller integral type would work, unless the user has
11130 explicitly requested that we use the smallest possible type. The
11131 user can request that for all enumerations with a command line
11132 flag, or for just one enumeration with an attribute. */
11134 use_short_enum = flag_short_enums
11135 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11137 for (itk = (use_short_enum ? itk_char : itk_int);
11141 underlying_type = integer_types[itk];
11142 if (TYPE_PRECISION (underlying_type) >= precision
11143 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11146 if (itk == itk_none)
11150 IF no integral type can represent all the enumerator values, the
11151 enumeration is ill-formed. */
11152 error ("no integral type can represent all of the enumerator values "
11153 "for %qT", enumtype);
11154 precision = TYPE_PRECISION (long_long_integer_type_node);
11155 underlying_type = integer_types[itk_unsigned_long_long];
11160 The value of sizeof() applied to an enumeration type, an object
11161 of an enumeration type, or an enumerator, is the value of sizeof()
11162 applied to the underlying type. */
11163 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11164 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11165 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11166 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11167 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11168 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11170 /* Set the underlying type of the enumeration type to the
11171 computed enumeration type, restricted to the enumerator
11173 ENUM_UNDERLYING_TYPE (enumtype)
11174 = build_distinct_type_copy (underlying_type);
11175 set_min_and_max_values_for_integral_type
11176 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11179 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11181 /* Compute the minimum and maximum values for the type.
11185 For an enumeration where emin is the smallest enumerator and emax
11186 is the largest, the values of the enumeration are the values of the
11187 underlying type in the range bmin to bmax, where bmin and bmax are,
11188 respectively, the smallest and largest values of the smallest bit-
11189 field that can store emin and emax. */
11191 /* The middle-end currently assumes that types with TYPE_PRECISION
11192 narrower than their underlying type are suitably zero or sign
11193 extended to fill their mode. g++ doesn't make these guarantees.
11194 Until the middle-end can represent such paradoxical types, we
11195 set the TYPE_PRECISION to the width of the underlying type. */
11196 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11198 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11200 /* Convert each of the enumerators to the type of the underlying
11201 type of the enumeration. */
11202 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11204 location_t saved_location;
11206 decl = TREE_VALUE (values);
11207 saved_location = input_location;
11208 input_location = DECL_SOURCE_LOCATION (decl);
11209 if (fixed_underlying_type_p)
11210 /* If the enumeration type has a fixed underlying type, we
11211 already checked all of the enumerator values. */
11212 value = DECL_INITIAL (decl);
11214 value = perform_implicit_conversion (underlying_type,
11215 DECL_INITIAL (decl),
11216 tf_warning_or_error);
11217 input_location = saved_location;
11219 /* Do not clobber shared ints. */
11220 value = copy_node (value);
11222 TREE_TYPE (value) = enumtype;
11223 DECL_INITIAL (decl) = value;
11226 /* Fix up all variant types of this enum type. */
11227 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11229 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11230 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11231 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11232 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11233 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11234 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11235 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11236 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11237 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11238 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11239 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11242 /* Finish up the scope of a scoped enumeration. */
11243 if (SCOPED_ENUM_P (enumtype))
11246 /* Finish debugging output for this type. */
11247 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11250 /* Build and install a CONST_DECL for an enumeration constant of the
11251 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11252 Assignment of sequential values by default is handled here. */
11255 build_enumerator (tree name, tree value, tree enumtype)
11261 /* If the VALUE was erroneous, pretend it wasn't there; that will
11262 result in the enum being assigned the next value in sequence. */
11263 if (value == error_mark_node)
11266 /* Remove no-op casts from the value. */
11268 STRIP_TYPE_NOPS (value);
11270 if (! processing_template_decl)
11272 /* Validate and default VALUE. */
11273 if (value != NULL_TREE)
11275 value = integral_constant_value (value);
11277 if (TREE_CODE (value) == INTEGER_CST)
11279 value = perform_integral_promotions (value);
11280 constant_expression_warning (value);
11284 error ("enumerator value for %qD is not an integer constant", name);
11289 /* Default based on previous value. */
11290 if (value == NULL_TREE)
11292 if (TYPE_VALUES (enumtype))
11295 unsigned HOST_WIDE_INT lo;
11299 /* The next value is the previous value plus one.
11300 add_double doesn't know the type of the target expression,
11301 so we must check with int_fits_type_p as well. */
11302 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11303 if (error_operand_p (prev_value))
11304 value = error_mark_node;
11307 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11308 TREE_INT_CST_HIGH (prev_value),
11310 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11312 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11316 error ("overflow in enumeration values at %qD", name);
11317 value = error_mark_node;
11322 value = integer_zero_node;
11325 /* Remove no-op casts from the value. */
11326 STRIP_TYPE_NOPS (value);
11328 /* If the underlying type of the enum is fixed, check whether
11329 the enumerator values fits in the underlying type. If it
11330 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11331 if (ENUM_UNDERLYING_TYPE (enumtype)
11333 && TREE_CODE (value) == INTEGER_CST
11334 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11336 error ("enumerator value %E is too large for underlying type %<%T%>",
11337 value, ENUM_UNDERLYING_TYPE (enumtype));
11339 /* Silently convert the value so that we can continue. */
11340 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11345 /* C++ associates enums with global, function, or class declarations. */
11346 context = current_scope ();
11348 /* Build the actual enumeration constant. Note that the enumeration
11349 constants have the underlying type of the enum (if it is fixed)
11350 or the type of their initializer (if the underlying type of the
11351 enum is not fixed):
11355 If the underlying type is fixed, the type of each enumerator
11356 prior to the closing brace is the underlying type; if the
11357 initializing value of an enumerator cannot be represented by
11358 the underlying type, the program is ill-formed. If the
11359 underlying type is not fixed, the type of each enumerator is
11360 the type of its initializing value.
11362 If the underlying type is not fixed, it will be computed by
11363 finish_enum and we will reset the type of this enumerator. Of
11364 course, if we're processing a template, there may be no value. */
11365 type = value ? TREE_TYPE (value) : NULL_TREE;
11367 if (context && context == current_class_type)
11368 /* This enum declaration is local to the class. We need the full
11369 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11370 decl = build_lang_decl (CONST_DECL, name, type);
11372 /* It's a global enum, or it's local to a function. (Note local to
11373 a function could mean local to a class method. */
11374 decl = build_decl (input_location, CONST_DECL, name, type);
11376 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11377 TREE_CONSTANT (decl) = 1;
11378 TREE_READONLY (decl) = 1;
11379 DECL_INITIAL (decl) = value;
11381 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11382 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11383 on the TYPE_FIELDS list for `S'. (That's so that you can say
11384 things like `S::i' later.) */
11385 finish_member_declaration (decl);
11389 /* Add this enumeration constant to the list for this type. */
11390 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11393 /* Look for an enumerator with the given NAME within the enumeration
11394 type ENUMTYPE. This routine is used primarily for qualified name
11395 lookup into an enumerator in C++0x, e.g.,
11397 enum class Color { Red, Green, Blue };
11399 Color color = Color::Red;
11401 Returns the value corresponding to the enumerator, or
11402 NULL_TREE if no such enumerator was found. */
11404 lookup_enumerator (tree enumtype, tree name)
11407 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11409 e = purpose_member (name, TYPE_VALUES (enumtype));
11410 return e? TREE_VALUE (e) : NULL_TREE;
11414 /* We're defining DECL. Make sure that it's type is OK. */
11417 check_function_type (tree decl, tree current_function_parms)
11419 tree fntype = TREE_TYPE (decl);
11420 tree return_type = complete_type (TREE_TYPE (fntype));
11422 /* In a function definition, arg types must be complete. */
11423 require_complete_types_for_parms (current_function_parms);
11425 if (dependent_type_p (return_type))
11427 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11428 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11430 tree args = TYPE_ARG_TYPES (fntype);
11432 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11433 error ("return type %q#T is incomplete", return_type);
11435 error ("return type has Java class type %q#T", return_type);
11437 /* Make it return void instead. */
11438 if (TREE_CODE (fntype) == METHOD_TYPE)
11439 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11441 TREE_CHAIN (args));
11443 fntype = build_function_type (void_type_node, args);
11445 = build_exception_variant (fntype,
11446 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11449 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11452 /* Create the FUNCTION_DECL for a function definition.
11453 DECLSPECS and DECLARATOR are the parts of the declaration;
11454 they describe the function's name and the type it returns,
11455 but twisted together in a fashion that parallels the syntax of C.
11457 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11458 DECLARATOR is really the DECL for the function we are about to
11459 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11460 indicating that the function is an inline defined in-class.
11462 This function creates a binding context for the function body
11463 as well as setting up the FUNCTION_DECL in current_function_decl.
11465 For C++, we must first check whether that datum makes any sense.
11466 For example, "class A local_a(1,2);" means that variable local_a
11467 is an aggregate of type A, which should have a constructor
11468 applied to it with the argument list [1, 2].
11470 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11471 or may be a BLOCK if the function has been defined previously
11472 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11473 error_mark_node if the function has never been defined, or
11474 a BLOCK if the function has been defined somewhere. */
11477 start_preparsed_function (tree decl1, tree attrs, int flags)
11479 tree ctype = NULL_TREE;
11482 int doing_friend = 0;
11483 struct cp_binding_level *bl;
11484 tree current_function_parms;
11485 struct c_fileinfo *finfo
11486 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11487 bool honor_interface;
11489 /* Sanity check. */
11490 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11491 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11493 fntype = TREE_TYPE (decl1);
11494 if (TREE_CODE (fntype) == METHOD_TYPE)
11495 ctype = TYPE_METHOD_BASETYPE (fntype);
11497 /* ISO C++ 11.4/5. A friend function defined in a class is in
11498 the (lexical) scope of the class in which it is defined. */
11499 if (!ctype && DECL_FRIEND_P (decl1))
11501 ctype = DECL_FRIEND_CONTEXT (decl1);
11503 /* CTYPE could be null here if we're dealing with a template;
11504 for example, `inline friend float foo()' inside a template
11505 will have no CTYPE set. */
11506 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11512 if (DECL_DECLARED_INLINE_P (decl1)
11513 && lookup_attribute ("noinline", attrs))
11514 warning (0, "inline function %q+D given attribute noinline", decl1);
11516 /* Handle gnu_inline attribute. */
11517 if (GNU_INLINE_P (decl1))
11519 DECL_EXTERNAL (decl1) = 1;
11520 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11521 DECL_INTERFACE_KNOWN (decl1) = 1;
11522 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11525 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11526 /* This is a constructor, we must ensure that any default args
11527 introduced by this definition are propagated to the clones
11528 now. The clones are used directly in overload resolution. */
11529 adjust_clone_args (decl1);
11531 /* Sometimes we don't notice that a function is a static member, and
11532 build a METHOD_TYPE for it. Fix that up now. */
11533 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11534 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11536 revert_static_member_fn (decl1);
11540 /* Set up current_class_type, and enter the scope of the class, if
11543 push_nested_class (ctype);
11544 else if (DECL_STATIC_FUNCTION_P (decl1))
11545 push_nested_class (DECL_CONTEXT (decl1));
11547 /* Now that we have entered the scope of the class, we must restore
11548 the bindings for any template parameters surrounding DECL1, if it
11549 is an inline member template. (Order is important; consider the
11550 case where a template parameter has the same name as a field of
11551 the class.) It is not until after this point that
11552 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11553 if (flags & SF_INCLASS_INLINE)
11554 maybe_begin_member_template_processing (decl1);
11556 /* Effective C++ rule 15. */
11558 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11559 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11560 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11562 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11563 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11564 if (!DECL_INITIAL (decl1))
11565 DECL_INITIAL (decl1) = error_mark_node;
11567 /* This function exists in static storage.
11568 (This does not mean `static' in the C sense!) */
11569 TREE_STATIC (decl1) = 1;
11571 /* We must call push_template_decl after current_class_type is set
11572 up. (If we are processing inline definitions after exiting a
11573 class scope, current_class_type will be NULL_TREE until set above
11574 by push_nested_class.) */
11575 if (processing_template_decl)
11577 /* FIXME: Handle error_mark_node more gracefully. */
11578 tree newdecl1 = push_template_decl (decl1);
11579 if (newdecl1 != error_mark_node)
11583 /* We are now in the scope of the function being defined. */
11584 current_function_decl = decl1;
11586 /* Save the parm names or decls from this function's declarator
11587 where store_parm_decls will find them. */
11588 current_function_parms = DECL_ARGUMENTS (decl1);
11590 /* Make sure the parameter and return types are reasonable. When
11591 you declare a function, these types can be incomplete, but they
11592 must be complete when you define the function. */
11593 check_function_type (decl1, current_function_parms);
11595 /* Build the return declaration for the function. */
11596 restype = TREE_TYPE (fntype);
11597 if (DECL_RESULT (decl1) == NULL_TREE)
11601 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11602 DECL_ARTIFICIAL (resdecl) = 1;
11603 DECL_IGNORED_P (resdecl) = 1;
11604 DECL_RESULT (decl1) = resdecl;
11606 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11609 /* Let the user know we're compiling this function. */
11610 announce_function (decl1);
11612 /* Record the decl so that the function name is defined.
11613 If we already have a decl for this name, and it is a FUNCTION_DECL,
11614 use the old decl. */
11615 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11617 /* A specialization is not used to guide overload resolution. */
11618 if (!DECL_FUNCTION_MEMBER_P (decl1)
11619 && !(DECL_USE_TEMPLATE (decl1) &&
11620 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11622 tree olddecl = pushdecl (decl1);
11624 if (olddecl == error_mark_node)
11625 /* If something went wrong when registering the declaration,
11626 use DECL1; we have to have a FUNCTION_DECL to use when
11627 parsing the body of the function. */
11631 /* Otherwise, OLDDECL is either a previous declaration
11632 of the same function or DECL1 itself. */
11634 if (warn_missing_declarations
11635 && olddecl == decl1
11636 && !DECL_MAIN_P (decl1)
11637 && TREE_PUBLIC (decl1)
11638 && !DECL_DECLARED_INLINE_P (decl1))
11642 /* Check whether DECL1 is in an anonymous
11644 for (context = DECL_CONTEXT (decl1);
11646 context = DECL_CONTEXT (context))
11648 if (TREE_CODE (context) == NAMESPACE_DECL
11649 && DECL_NAME (context) == NULL_TREE)
11653 if (context == NULL)
11654 warning (OPT_Wmissing_declarations,
11655 "no previous declaration for %q+D", decl1);
11663 /* We need to set the DECL_CONTEXT. */
11664 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11665 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11667 fntype = TREE_TYPE (decl1);
11669 /* If #pragma weak applies, mark the decl appropriately now.
11670 The pragma only applies to global functions. Because
11671 determining whether or not the #pragma applies involves
11672 computing the mangled name for the declaration, we cannot
11673 apply the pragma until after we have merged this declaration
11674 with any previous declarations; if the original declaration
11675 has a linkage specification, that specification applies to
11676 the definition as well, and may affect the mangled name. */
11677 if (!DECL_CONTEXT (decl1))
11678 maybe_apply_pragma_weak (decl1);
11681 /* Reset this in case the call to pushdecl changed it. */
11682 current_function_decl = decl1;
11684 gcc_assert (DECL_INITIAL (decl1));
11686 /* This function may already have been parsed, in which case just
11687 return; our caller will skip over the body without parsing. */
11688 if (DECL_INITIAL (decl1) != error_mark_node)
11691 /* Initialize RTL machinery. We cannot do this until
11692 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11693 even when processing a template; this is how we get
11694 CFUN set up, and our per-function variables initialized.
11695 FIXME factor out the non-RTL stuff. */
11696 bl = current_binding_level;
11697 allocate_struct_function (decl1, processing_template_decl);
11699 /* Initialize the language data structures. Whenever we start
11700 a new function, we destroy temporaries in the usual way. */
11701 cfun->language = GGC_CNEW (struct language_function);
11702 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11703 current_binding_level = bl;
11705 /* Even though we're inside a function body, we still don't want to
11706 call expand_expr to calculate the size of a variable-sized array.
11707 We haven't necessarily assigned RTL to all variables yet, so it's
11708 not safe to try to expand expressions involving them. */
11709 cfun->dont_save_pending_sizes_p = 1;
11711 /* Start the statement-tree, start the tree now. */
11712 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11714 /* If we are (erroneously) defining a function that we have already
11715 defined before, wipe out what we knew before. */
11716 if (!DECL_PENDING_INLINE_P (decl1))
11717 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11719 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11721 /* We know that this was set up by `grokclassfn'. We do not
11722 wait until `store_parm_decls', since evil parse errors may
11723 never get us to that point. Here we keep the consistency
11724 between `current_class_type' and `current_class_ptr'. */
11725 tree t = DECL_ARGUMENTS (decl1);
11727 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11728 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11730 cp_function_chain->x_current_class_ref
11731 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11732 cp_function_chain->x_current_class_ptr = t;
11734 /* Constructors and destructors need to know whether they're "in
11735 charge" of initializing virtual base classes. */
11736 t = TREE_CHAIN (t);
11737 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11739 current_in_charge_parm = t;
11740 t = TREE_CHAIN (t);
11742 if (DECL_HAS_VTT_PARM_P (decl1))
11744 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11745 current_vtt_parm = t;
11749 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11750 /* Implicitly-defined methods (like the
11751 destructor for a class in which no destructor
11752 is explicitly declared) must not be defined
11753 until their definition is needed. So, we
11754 ignore interface specifications for
11755 compiler-generated functions. */
11756 && !DECL_ARTIFICIAL (decl1));
11758 if (DECL_INTERFACE_KNOWN (decl1))
11760 tree ctx = decl_function_context (decl1);
11762 if (DECL_NOT_REALLY_EXTERN (decl1))
11763 DECL_EXTERNAL (decl1) = 0;
11765 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11766 && TREE_PUBLIC (ctx))
11767 /* This is a function in a local class in an extern inline
11769 comdat_linkage (decl1);
11771 /* If this function belongs to an interface, it is public.
11772 If it belongs to someone else's interface, it is also external.
11773 This only affects inlines and template instantiations. */
11774 else if (!finfo->interface_unknown && honor_interface)
11776 if (DECL_DECLARED_INLINE_P (decl1)
11777 || DECL_TEMPLATE_INSTANTIATION (decl1)
11778 || processing_template_decl)
11780 DECL_EXTERNAL (decl1)
11781 = (finfo->interface_only
11782 || (DECL_DECLARED_INLINE_P (decl1)
11783 && ! flag_implement_inlines
11784 && !DECL_VINDEX (decl1)));
11786 /* For WIN32 we also want to put these in linkonce sections. */
11787 maybe_make_one_only (decl1);
11790 DECL_EXTERNAL (decl1) = 0;
11791 DECL_INTERFACE_KNOWN (decl1) = 1;
11792 /* If this function is in an interface implemented in this file,
11793 make sure that the back end knows to emit this function
11795 if (!DECL_EXTERNAL (decl1))
11796 mark_needed (decl1);
11798 else if (finfo->interface_unknown && finfo->interface_only
11799 && honor_interface)
11801 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11802 interface, we will have both finfo->interface_unknown and
11803 finfo->interface_only set. In that case, we don't want to
11804 use the normal heuristics because someone will supply a
11805 #pragma implementation elsewhere, and deducing it here would
11806 produce a conflict. */
11807 comdat_linkage (decl1);
11808 DECL_EXTERNAL (decl1) = 0;
11809 DECL_INTERFACE_KNOWN (decl1) = 1;
11810 DECL_DEFER_OUTPUT (decl1) = 1;
11814 /* This is a definition, not a reference.
11815 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11816 if (!GNU_INLINE_P (decl1))
11817 DECL_EXTERNAL (decl1) = 0;
11819 if ((DECL_DECLARED_INLINE_P (decl1)
11820 || DECL_TEMPLATE_INSTANTIATION (decl1))
11821 && ! DECL_INTERFACE_KNOWN (decl1)
11822 /* Don't try to defer nested functions for now. */
11823 && ! decl_function_context (decl1))
11824 DECL_DEFER_OUTPUT (decl1) = 1;
11826 DECL_INTERFACE_KNOWN (decl1) = 1;
11829 /* Determine the ELF visibility attribute for the function. We must not
11830 do this before calling "pushdecl", as we must allow "duplicate_decls"
11831 to merge any attributes appropriately. We also need to wait until
11833 if (!DECL_CLONED_FUNCTION_P (decl1))
11834 determine_visibility (decl1);
11836 begin_scope (sk_function_parms, decl1);
11840 if (DECL_DESTRUCTOR_P (decl1)
11841 || (DECL_CONSTRUCTOR_P (decl1)
11842 && targetm.cxx.cdtor_returns_this ()))
11844 cdtor_label = build_decl (input_location,
11845 LABEL_DECL, NULL_TREE, NULL_TREE);
11846 DECL_CONTEXT (cdtor_label) = current_function_decl;
11849 start_fname_decls ();
11851 store_parm_decls (current_function_parms);
11855 /* Like start_preparsed_function, except that instead of a
11856 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11858 Returns 1 on success. If the DECLARATOR is not suitable for a function
11859 (it defines a datum instead), we return 0, which tells
11860 yyparse to report a parse error. */
11863 start_function (cp_decl_specifier_seq *declspecs,
11864 const cp_declarator *declarator,
11869 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11870 if (decl1 == error_mark_node)
11872 /* If the declarator is not suitable for a function definition,
11873 cause a syntax error. */
11874 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11876 error ("invalid function declaration");
11880 if (DECL_MAIN_P (decl1))
11881 /* main must return int. grokfndecl should have corrected it
11882 (and issued a diagnostic) if the user got it wrong. */
11883 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11884 integer_type_node));
11886 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11891 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11895 use_eh_spec_block (tree fn)
11897 return (flag_exceptions && flag_enforce_eh_specs
11898 && !processing_template_decl
11899 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11900 /* We insert the EH_SPEC_BLOCK only in the original
11901 function; then, it is copied automatically to the
11903 && !DECL_CLONED_FUNCTION_P (fn)
11904 /* Implicitly-generated constructors and destructors have
11905 exception specifications. However, those specifications
11906 are the union of the possible exceptions specified by the
11907 constructors/destructors for bases and members, so no
11908 unallowed exception will ever reach this function. By
11909 not creating the EH_SPEC_BLOCK we save a little memory,
11910 and we avoid spurious warnings about unreachable
11912 && !DECL_ARTIFICIAL (fn));
11915 /* Store the parameter declarations into the current function declaration.
11916 This is called after parsing the parameter declarations, before
11917 digesting the body of the function.
11919 Also install to binding contour return value identifier, if any. */
11922 store_parm_decls (tree current_function_parms)
11924 tree fndecl = current_function_decl;
11927 /* This is a chain of any other decls that came in among the parm
11928 declarations. If a parm is declared with enum {foo, bar} x;
11929 then CONST_DECLs for foo and bar are put here. */
11930 tree nonparms = NULL_TREE;
11932 if (current_function_parms)
11934 /* This case is when the function was defined with an ANSI prototype.
11935 The parms already have decls, so we need not do anything here
11936 except record them as in effect
11937 and complain if any redundant old-style parm decls were written. */
11939 tree specparms = current_function_parms;
11942 /* Must clear this because it might contain TYPE_DECLs declared
11944 current_binding_level->names = NULL;
11946 /* If we're doing semantic analysis, then we'll call pushdecl
11947 for each of these. We must do them in reverse order so that
11948 they end in the correct forward order. */
11949 specparms = nreverse (specparms);
11951 for (parm = specparms; parm; parm = next)
11953 next = TREE_CHAIN (parm);
11954 if (TREE_CODE (parm) == PARM_DECL)
11956 if (DECL_NAME (parm) == NULL_TREE
11957 || TREE_CODE (parm) != VOID_TYPE)
11960 error ("parameter %qD declared void", parm);
11964 /* If we find an enum constant or a type tag,
11965 put it aside for the moment. */
11966 TREE_CHAIN (parm) = NULL_TREE;
11967 nonparms = chainon (nonparms, parm);
11971 /* Get the decls in their original chain order and record in the
11972 function. This is all and only the PARM_DECLs that were
11973 pushed into scope by the loop above. */
11974 DECL_ARGUMENTS (fndecl) = getdecls ();
11977 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11979 /* Now store the final chain of decls for the arguments
11980 as the decl-chain of the current lexical scope.
11981 Put the enumerators in as well, at the front so that
11982 DECL_ARGUMENTS is not modified. */
11983 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11985 if (use_eh_spec_block (current_function_decl))
11986 current_eh_spec_block = begin_eh_spec_block ();
11990 /* We have finished doing semantic analysis on DECL, but have not yet
11991 generated RTL for its body. Save away our current state, so that
11992 when we want to generate RTL later we know what to do. */
11995 save_function_data (tree decl)
11997 struct language_function *f;
11999 /* Save the language-specific per-function data so that we can
12000 get it back when we really expand this function. */
12001 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12004 f = GGC_NEW (struct language_function);
12005 memcpy (f, cp_function_chain, sizeof (struct language_function));
12006 DECL_SAVED_FUNCTION_DATA (decl) = f;
12008 /* Clear out the bits we don't need. */
12009 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12010 f->bindings = NULL;
12011 f->x_local_names = NULL;
12015 /* Set the return value of the constructor (if present). */
12018 finish_constructor_body (void)
12023 if (targetm.cxx.cdtor_returns_this ()
12024 && (! TYPE_FOR_JAVA (current_class_type)))
12026 /* Any return from a constructor will end up here. */
12027 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12029 val = DECL_ARGUMENTS (current_function_decl);
12030 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12031 DECL_RESULT (current_function_decl), val);
12032 /* Return the address of the object. */
12033 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12034 add_stmt (exprstmt);
12038 /* Do all the processing for the beginning of a destructor; set up the
12039 vtable pointers and cleanups for bases and members. */
12042 begin_destructor_body (void)
12044 tree compound_stmt;
12046 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12047 issued an error message. We still want to try to process the
12048 body of the function, but initialize_vtbl_ptrs will crash if
12049 TYPE_BINFO is NULL. */
12050 if (COMPLETE_TYPE_P (current_class_type))
12052 compound_stmt = begin_compound_stmt (0);
12053 /* Make all virtual function table pointers in non-virtual base
12054 classes point to CURRENT_CLASS_TYPE's virtual function
12056 initialize_vtbl_ptrs (current_class_ptr);
12057 finish_compound_stmt (compound_stmt);
12059 /* And insert cleanups for our bases and members so that they
12060 will be properly destroyed if we throw. */
12061 push_base_cleanups ();
12065 /* At the end of every destructor we generate code to delete the object if
12066 necessary. Do that now. */
12069 finish_destructor_body (void)
12073 /* Any return from a destructor will end up here; that way all base
12074 and member cleanups will be run when the function returns. */
12075 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12077 /* In a virtual destructor, we must call delete. */
12078 if (DECL_VIRTUAL_P (current_function_decl))
12081 tree virtual_size = cxx_sizeof (current_class_type);
12085 At the point of definition of a virtual destructor (including
12086 an implicit definition), non-placement operator delete shall
12087 be looked up in the scope of the destructor's class and if
12088 found shall be accessible and unambiguous. */
12089 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12091 /*global_p=*/false,
12092 /*placement=*/NULL_TREE,
12093 /*alloc_fn=*/NULL_TREE);
12095 if_stmt = begin_if_stmt ();
12096 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12097 current_in_charge_parm,
12100 finish_expr_stmt (exprstmt);
12101 finish_then_clause (if_stmt);
12102 finish_if_stmt (if_stmt);
12105 if (targetm.cxx.cdtor_returns_this ())
12109 val = DECL_ARGUMENTS (current_function_decl);
12110 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12111 DECL_RESULT (current_function_decl), val);
12112 /* Return the address of the object. */
12113 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12114 add_stmt (exprstmt);
12118 /* Do the necessary processing for the beginning of a function body, which
12119 in this case includes member-initializers, but not the catch clauses of
12120 a function-try-block. Currently, this means opening a binding level
12121 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12124 begin_function_body (void)
12128 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12131 if (processing_template_decl)
12132 /* Do nothing now. */;
12134 /* Always keep the BLOCK node associated with the outermost pair of
12135 curly braces of a function. These are needed for correct
12136 operation of dwarfout.c. */
12137 keep_next_level (true);
12139 stmt = begin_compound_stmt (BCS_FN_BODY);
12141 if (processing_template_decl)
12142 /* Do nothing now. */;
12143 else if (DECL_DESTRUCTOR_P (current_function_decl))
12144 begin_destructor_body ();
12149 /* Do the processing for the end of a function body. Currently, this means
12150 closing out the cleanups for fully-constructed bases and members, and in
12151 the case of the destructor, deleting the object if desired. Again, this
12152 is only meaningful for [cd]tors, since they are the only functions where
12153 there is a significant distinction between the main body and any
12154 function catch clauses. Handling, say, main() return semantics here
12155 would be wrong, as flowing off the end of a function catch clause for
12156 main() would also need to return 0. */
12159 finish_function_body (tree compstmt)
12161 if (compstmt == NULL_TREE)
12164 /* Close the block. */
12165 finish_compound_stmt (compstmt);
12167 if (processing_template_decl)
12168 /* Do nothing now. */;
12169 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12170 finish_constructor_body ();
12171 else if (DECL_DESTRUCTOR_P (current_function_decl))
12172 finish_destructor_body ();
12175 /* Given a function, returns the BLOCK corresponding to the outermost level
12176 of curly braces, skipping the artificial block created for constructor
12180 outer_curly_brace_block (tree fndecl)
12182 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12183 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12184 /* Skip the artificial function body block. */
12185 block = BLOCK_SUBBLOCKS (block);
12189 /* Finish up a function declaration and compile that function
12190 all the way to assembler language output. The free the storage
12191 for the function definition.
12193 FLAGS is a bitwise or of the following values:
12195 We just finished processing the body of an in-class inline
12196 function definition. (This processing will have taken place
12197 after the class definition is complete.) */
12200 finish_function (int flags)
12202 tree fndecl = current_function_decl;
12203 tree fntype, ctype = NULL_TREE;
12204 int inclass_inline = (flags & 2) != 0;
12207 /* When we get some parse errors, we can end up without a
12208 current_function_decl, so cope. */
12209 if (fndecl == NULL_TREE)
12210 return error_mark_node;
12212 gcc_assert (!defer_mark_used_calls);
12213 defer_mark_used_calls = true;
12215 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12216 && DECL_VIRTUAL_P (fndecl)
12217 && !processing_template_decl)
12219 tree fnclass = DECL_CONTEXT (fndecl);
12220 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12221 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12224 nested = function_depth > 1;
12225 fntype = TREE_TYPE (fndecl);
12227 /* TREE_READONLY (fndecl) = 1;
12228 This caused &foo to be of type ptr-to-const-function
12229 which then got a warning when stored in a ptr-to-function variable. */
12231 gcc_assert (building_stmt_tree ());
12232 /* The current function is being defined, so its DECL_INITIAL should
12233 be set, and unless there's a multiple definition, it should be
12234 error_mark_node. */
12235 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12237 /* For a cloned function, we've already got all the code we need;
12238 there's no need to add any extra bits. */
12239 if (!DECL_CLONED_FUNCTION_P (fndecl))
12241 if (DECL_MAIN_P (current_function_decl))
12245 /* Make it so that `main' always returns 0 by default (or
12248 stmt = finish_return_stmt (integer_one_node);
12250 stmt = finish_return_stmt (integer_zero_node);
12252 /* Hack. We don't want the middle-end to warn that this
12253 return is unreachable, so put the statement on the
12256 location_t linezero = linemap_line_start (line_table, 0, 1);
12257 SET_EXPR_LOCATION (stmt, linezero);
12261 if (use_eh_spec_block (current_function_decl))
12262 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12263 (TREE_TYPE (current_function_decl)),
12264 current_eh_spec_block);
12267 /* If we're saving up tree structure, tie off the function now. */
12268 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12270 finish_fname_decls ();
12272 /* If this function can't throw any exceptions, remember that. */
12273 if (!processing_template_decl
12274 && !cp_function_chain->can_throw
12275 && !flag_non_call_exceptions
12276 && !DECL_REPLACEABLE_P (fndecl))
12277 TREE_NOTHROW (fndecl) = 1;
12279 /* This must come after expand_function_end because cleanups might
12280 have declarations (from inline functions) that need to go into
12281 this function's blocks. */
12283 /* If the current binding level isn't the outermost binding level
12284 for this function, either there is a bug, or we have experienced
12285 syntax errors and the statement tree is malformed. */
12286 if (current_binding_level->kind != sk_function_parms)
12288 /* Make sure we have already experienced errors. */
12289 gcc_assert (errorcount);
12291 /* Throw away the broken statement tree and extra binding
12293 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12295 while (current_binding_level->kind != sk_function_parms)
12297 if (current_binding_level->kind == sk_class)
12298 pop_nested_class ();
12300 poplevel (0, 0, 0);
12303 poplevel (1, 0, 1);
12305 /* Statements should always be full-expressions at the outermost set
12306 of curly braces for a function. */
12307 gcc_assert (stmts_are_full_exprs_p ());
12309 /* Set up the named return value optimization, if we can. Candidate
12310 variables are selected in check_return_expr. */
12311 if (current_function_return_value)
12313 tree r = current_function_return_value;
12316 if (r != error_mark_node
12317 /* This is only worth doing for fns that return in memory--and
12318 simpler, since we don't have to worry about promoted modes. */
12319 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12320 /* Only allow this for variables declared in the outer scope of
12321 the function so we know that their lifetime always ends with a
12322 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12323 we were to do this optimization in tree-ssa. */
12324 && (outer = outer_curly_brace_block (fndecl))
12325 && chain_member (r, BLOCK_VARS (outer)))
12326 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12328 current_function_return_value = NULL_TREE;
12331 /* Remember that we were in class scope. */
12332 if (current_class_name)
12333 ctype = current_class_type;
12335 /* Must mark the RESULT_DECL as being in this function. */
12336 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12338 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12339 to the FUNCTION_DECL node itself. */
12340 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12342 /* Save away current state, if appropriate. */
12343 if (!processing_template_decl)
12344 save_function_data (fndecl);
12346 /* Complain if there's just no return statement. */
12347 if (warn_return_type
12348 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12349 && !dependent_type_p (TREE_TYPE (fntype))
12350 && !current_function_returns_value && !current_function_returns_null
12351 /* Don't complain if we abort or throw. */
12352 && !current_function_returns_abnormally
12353 && !DECL_NAME (DECL_RESULT (fndecl))
12354 && !TREE_NO_WARNING (fndecl)
12355 /* Structor return values (if any) are set by the compiler. */
12356 && !DECL_CONSTRUCTOR_P (fndecl)
12357 && !DECL_DESTRUCTOR_P (fndecl))
12359 warning (OPT_Wreturn_type,
12360 "no return statement in function returning non-void");
12361 TREE_NO_WARNING (fndecl) = 1;
12364 /* Store the end of the function, so that we get good line number
12365 info for the epilogue. */
12366 cfun->function_end_locus = input_location;
12368 /* Genericize before inlining. */
12369 if (!processing_template_decl)
12371 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12372 invoke_plugin_callbacks (PLUGIN_CXX_CP_PRE_GENERICIZE, fndecl);
12373 cp_genericize (fndecl);
12374 /* Clear out the bits we don't need. */
12375 f->x_current_class_ptr = NULL;
12376 f->x_current_class_ref = NULL;
12377 f->x_eh_spec_block = NULL;
12378 f->x_in_charge_parm = NULL;
12379 f->x_vtt_parm = NULL;
12380 f->x_return_value = NULL;
12381 f->bindings = NULL;
12382 f->extern_decl_map = NULL;
12384 /* Clear out the bits we don't need. */
12385 local_names = NULL;
12387 /* We're leaving the context of this function, so zap cfun. It's still in
12388 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12390 current_function_decl = NULL;
12392 /* If this is an in-class inline definition, we may have to pop the
12393 bindings for the template parameters that we added in
12394 maybe_begin_member_template_processing when start_function was
12396 if (inclass_inline)
12397 maybe_end_member_template_processing ();
12399 /* Leave the scope of the class. */
12401 pop_nested_class ();
12407 /* Let the error reporting routines know that we're outside a
12408 function. For a nested function, this value is used in
12409 cxx_pop_function_context and then reset via pop_function_context. */
12410 current_function_decl = NULL_TREE;
12412 defer_mark_used_calls = false;
12413 if (deferred_mark_used_calls)
12418 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12420 VEC_free (tree, gc, deferred_mark_used_calls);
12426 /* Create the FUNCTION_DECL for a function definition.
12427 DECLSPECS and DECLARATOR are the parts of the declaration;
12428 they describe the return type and the name of the function,
12429 but twisted together in a fashion that parallels the syntax of C.
12431 This function creates a binding context for the function body
12432 as well as setting up the FUNCTION_DECL in current_function_decl.
12434 Returns a FUNCTION_DECL on success.
12436 If the DECLARATOR is not suitable for a function (it defines a datum
12437 instead), we return 0, which tells yyparse to report a parse error.
12439 May return void_type_node indicating that this method is actually
12440 a friend. See grokfield for more details.
12442 Came here with a `.pushlevel' .
12444 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12445 CHANGES TO CODE IN `grokfield'. */
12448 grokmethod (cp_decl_specifier_seq *declspecs,
12449 const cp_declarator *declarator, tree attrlist)
12451 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12454 if (fndecl == error_mark_node)
12455 return error_mark_node;
12457 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12459 error ("invalid member function declaration");
12460 return error_mark_node;
12464 cplus_decl_attributes (&fndecl, attrlist, 0);
12466 /* Pass friends other than inline friend functions back. */
12467 if (fndecl == void_type_node)
12470 if (DECL_IN_AGGR_P (fndecl))
12472 if (DECL_CONTEXT (fndecl)
12473 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12474 error ("%qD is already defined in class %qT", fndecl,
12475 DECL_CONTEXT (fndecl));
12476 return error_mark_node;
12479 check_template_shadow (fndecl);
12481 DECL_DECLARED_INLINE_P (fndecl) = 1;
12482 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12484 /* We process method specializations in finish_struct_1. */
12485 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12487 fndecl = push_template_decl (fndecl);
12488 if (fndecl == error_mark_node)
12492 if (! DECL_FRIEND_P (fndecl))
12494 if (TREE_CHAIN (fndecl))
12496 fndecl = copy_node (fndecl);
12497 TREE_CHAIN (fndecl) = NULL_TREE;
12501 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12503 DECL_IN_AGGR_P (fndecl) = 1;
12508 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12509 we can lay it out later, when and if its type becomes complete. */
12512 maybe_register_incomplete_var (tree var)
12514 gcc_assert (TREE_CODE (var) == VAR_DECL);
12516 /* Keep track of variables with incomplete types. */
12517 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12518 && DECL_EXTERNAL (var))
12520 tree inner_type = TREE_TYPE (var);
12522 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12523 inner_type = TREE_TYPE (inner_type);
12524 inner_type = TYPE_MAIN_VARIANT (inner_type);
12526 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12527 /* RTTI TD entries are created while defining the type_info. */
12528 || (TYPE_LANG_SPECIFIC (inner_type)
12529 && TYPE_BEING_DEFINED (inner_type)))
12530 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12534 /* Called when a class type (given by TYPE) is defined. If there are
12535 any existing VAR_DECLs whose type has been completed by this
12536 declaration, update them now. */
12539 complete_vars (tree type)
12541 tree *list = &incomplete_vars;
12543 gcc_assert (CLASS_TYPE_P (type));
12546 if (same_type_p (type, TREE_PURPOSE (*list)))
12548 tree var = TREE_VALUE (*list);
12549 tree type = TREE_TYPE (var);
12550 /* Complete the type of the variable. The VAR_DECL itself
12551 will be laid out in expand_expr. */
12552 complete_type (type);
12553 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12554 /* Remove this entry from the list. */
12555 *list = TREE_CHAIN (*list);
12558 list = &TREE_CHAIN (*list);
12561 /* Check for pending declarations which may have abstract type. */
12562 complete_type_check_abstract (type);
12565 /* If DECL is of a type which needs a cleanup, build and return an
12566 expression to perform that cleanup here. Return NULL_TREE if no
12567 cleanup need be done. */
12570 cxx_maybe_build_cleanup (tree decl)
12576 /* Assume no cleanup is required. */
12577 cleanup = NULL_TREE;
12579 if (error_operand_p (decl))
12582 /* Handle "__attribute__((cleanup))". We run the cleanup function
12583 before the destructor since the destructor is what actually
12584 terminates the lifetime of the object. */
12585 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12592 /* Get the name specified by the user for the cleanup function. */
12593 id = TREE_VALUE (TREE_VALUE (attr));
12594 /* Look up the name to find the cleanup function to call. It is
12595 important to use lookup_name here because that is what is
12596 used in c-common.c:handle_cleanup_attribute when performing
12597 initial checks on the attribute. Note that those checks
12598 include ensuring that the function found is not an overloaded
12599 function, or an object with an overloaded call operator,
12600 etc.; we can rely on the fact that the function found is an
12601 ordinary FUNCTION_DECL. */
12602 fn = lookup_name (id);
12603 arg = build_address (decl);
12605 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12607 tf_warning_or_error);
12609 /* Handle ordinary C++ destructors. */
12610 type = TREE_TYPE (decl);
12611 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12613 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12614 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12615 && CLASSTYPE_VBASECLASSES (type));
12619 if (TREE_CODE (type) == ARRAY_TYPE)
12622 addr = build_address (decl);
12624 /* Optimize for space over speed here. */
12625 if (!has_vbases || flag_expensive_optimizations)
12626 flags |= LOOKUP_NONVIRTUAL;
12628 call = build_delete (TREE_TYPE (addr), addr,
12629 sfk_complete_destructor, flags, 0);
12631 cleanup = build_compound_expr (input_location, cleanup, call);
12639 /* When a stmt has been parsed, this function is called. */
12646 /* DECL was originally constructed as a non-static member function,
12647 but turned out to be static. Update it accordingly. */
12650 revert_static_member_fn (tree decl)
12653 tree function = TREE_TYPE (decl);
12654 tree args = TYPE_ARG_TYPES (function);
12656 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12657 != TYPE_UNQUALIFIED)
12658 error ("static member function %q#D declared with type qualifiers", decl);
12660 args = TREE_CHAIN (args);
12661 tmp = build_function_type (TREE_TYPE (function), args);
12662 tmp = build_qualified_type (tmp, cp_type_quals (function));
12663 tmp = build_exception_variant (tmp,
12664 TYPE_RAISES_EXCEPTIONS (function));
12665 TREE_TYPE (decl) = tmp;
12666 if (DECL_ARGUMENTS (decl))
12667 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12668 DECL_STATIC_FUNCTION_P (decl) = 1;
12671 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12672 one of the language-independent trees. */
12674 enum cp_tree_node_structure_enum
12675 cp_tree_node_structure (union lang_tree_node * t)
12677 switch (TREE_CODE (&t->generic))
12679 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12680 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12681 case OVERLOAD: return TS_CP_OVERLOAD;
12682 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12683 case PTRMEM_CST: return TS_CP_PTRMEM;
12684 case BASELINK: return TS_CP_BASELINK;
12685 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12686 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12687 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12688 default: return TS_CP_GENERIC;
12692 /* Build the void_list_node (void_type_node having been created). */
12694 build_void_list_node (void)
12696 tree t = build_tree_list (NULL_TREE, void_type_node);
12701 cp_missing_noreturn_ok_p (tree decl)
12703 /* A missing noreturn is ok for the `main' function. */
12704 return DECL_MAIN_P (decl);
12707 /* Return the COMDAT group into which DECL should be placed. */
12710 cxx_comdat_group (tree decl)
12714 /* Virtual tables, construction virtual tables, and virtual table
12715 tables all go in a single COMDAT group, named after the primary
12717 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12718 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12719 /* For all other DECLs, the COMDAT group is the mangled name of the
12720 declaration itself. */
12723 while (DECL_THUNK_P (decl))
12725 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12726 into the same section as the target function. In that case
12727 we must return target's name. */
12728 tree target = THUNK_TARGET (decl);
12729 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12730 && DECL_SECTION_NAME (target) != NULL
12731 && DECL_ONE_ONLY (target))
12736 name = DECL_ASSEMBLER_NAME (decl);
12742 #include "gt-cp-decl.h"