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"
51 #include "diagnostic.h"
55 #include "tree-flow.h"
56 #include "pointer-set.h"
59 static tree grokparms (tree parmlist, tree *);
60 static const char *redeclaration_error_message (tree, tree);
62 static int decl_jump_unsafe (tree);
63 static void require_complete_types_for_parms (tree);
64 static int ambi_op_p (enum tree_code);
65 static int unary_op_p (enum tree_code);
66 static void push_local_name (tree);
67 static tree grok_reference_init (tree, tree, tree, tree *);
68 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
70 static void record_unknown_type (tree, const char *);
71 static tree builtin_function_1 (tree, tree, bool);
72 static tree build_library_fn_1 (tree, enum tree_code, tree);
73 static int member_function_or_else (tree, tree, enum overload_flags);
74 static void bad_specifiers (tree, const char *, int, int, int, int,
76 static void check_for_uninitialized_const_var (tree);
77 static hashval_t typename_hash (const void *);
78 static int typename_compare (const void *, const void *);
79 static tree local_variable_p_walkfn (tree *, int *, void *);
80 static tree record_builtin_java_type (const char *, int);
81 static const char *tag_name (enum tag_types);
82 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
83 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
84 static void maybe_deduce_size_from_array_init (tree, tree);
85 static void layout_var_decl (tree);
86 static tree check_initializer (tree, tree, int, tree *);
87 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
88 static void save_function_data (tree);
89 static void check_function_type (tree, tree);
90 static void finish_constructor_body (void);
91 static void begin_destructor_body (void);
92 static void finish_destructor_body (void);
93 static tree create_array_type_for_decl (tree, tree, tree);
94 static tree get_atexit_node (void);
95 static tree get_dso_handle_node (void);
96 static tree start_cleanup_fn (void);
97 static void end_cleanup_fn (void);
98 static tree cp_make_fname_decl (location_t, tree, int);
99 static void initialize_predefined_identifiers (void);
100 static tree check_special_function_return_type
101 (special_function_kind, tree, tree);
102 static tree push_cp_library_fn (enum tree_code, tree);
103 static tree build_cp_library_fn (tree, enum tree_code, tree);
104 static void store_parm_decls (tree);
105 static void initialize_local_var (tree, tree);
106 static void expand_static_init (tree, 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. */
526 int leaving_for_scope;
529 timevar_push (TV_NAME_LOOKUP);
534 gcc_assert (current_binding_level->kind != sk_class);
536 if (current_binding_level->kind == sk_cleanup)
538 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
540 gcc_assert (!VEC_length(cp_class_binding,
541 current_binding_level->class_shadowed));
543 /* We used to use KEEP == 2 to indicate that the new block should go
544 at the beginning of the list of blocks at this binding level,
545 rather than the end. This hack is no longer used. */
546 gcc_assert (keep == 0 || keep == 1);
548 if (current_binding_level->keep)
551 /* Any uses of undefined labels, and any defined labels, now operate
552 under constraints of next binding contour. */
553 if (cfun && !functionbody && named_labels)
554 htab_traverse (named_labels, poplevel_named_label_1,
555 current_binding_level);
557 /* Get the decls in the order they were written.
558 Usually current_binding_level->names is in reverse order.
559 But parameter decls were previously put in forward order. */
562 current_binding_level->names
563 = decls = nreverse (current_binding_level->names);
565 decls = current_binding_level->names;
567 /* If there were any declarations or structure tags in that level,
568 or if this level is a function body,
569 create a BLOCK to record them for the life of this function. */
571 if (keep == 1 || functionbody)
572 block = make_node (BLOCK);
573 if (block != NULL_TREE)
575 BLOCK_VARS (block) = decls;
576 BLOCK_SUBBLOCKS (block) = subblocks;
579 /* In each subblock, record that this is its superior. */
581 for (link = subblocks; link; link = BLOCK_CHAIN (link))
582 BLOCK_SUPERCONTEXT (link) = block;
584 /* We still support the old for-scope rules, whereby the variables
585 in a for-init statement were in scope after the for-statement
586 ended. We only use the new rules if flag_new_for_scope is
589 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
591 /* Before we remove the declarations first check for unused variables. */
592 if (warn_unused_variable
593 && !processing_template_decl)
594 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
595 if (TREE_CODE (decl) == VAR_DECL
596 && ! TREE_USED (decl)
597 && ! DECL_IN_SYSTEM_HEADER (decl)
598 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
599 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
601 /* Remove declarations for all the DECLs in this level. */
602 for (link = decls; link; link = TREE_CHAIN (link))
604 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
607 tree name = DECL_NAME (link);
611 ob = outer_binding (name,
612 IDENTIFIER_BINDING (name),
615 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
617 ns_binding = NULL_TREE;
619 if (ob && ob->scope == current_binding_level->level_chain)
620 /* We have something like:
625 and we are leaving the `for' scope. There's no reason to
626 keep the binding of the inner `i' in this case. */
627 pop_binding (name, link);
628 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
629 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
630 /* Here, we have something like:
638 We must pop the for-scope binding so we know what's a
639 type and what isn't. */
640 pop_binding (name, link);
643 /* Mark this VAR_DECL as dead so that we can tell we left it
644 there only for backward compatibility. */
645 DECL_DEAD_FOR_LOCAL (link) = 1;
647 /* Keep track of what should have happened when we
648 popped the binding. */
651 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
652 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
655 /* Add it to the list of dead variables in the next
656 outermost binding to that we can remove these when we
657 leave that binding. */
658 current_binding_level->level_chain->dead_vars_from_for
659 = tree_cons (NULL_TREE, link,
660 current_binding_level->level_chain->
663 /* Although we don't pop the cxx_binding, we do clear
664 its SCOPE since the scope is going away now. */
665 IDENTIFIER_BINDING (name)->scope
666 = current_binding_level->level_chain;
673 /* Remove the binding. */
676 if (TREE_CODE (decl) == TREE_LIST)
677 decl = TREE_VALUE (decl);
680 if (TREE_CODE (name) == OVERLOAD)
681 name = OVL_FUNCTION (name);
683 gcc_assert (DECL_P (name));
684 pop_binding (DECL_NAME (name), decl);
688 /* Remove declarations for any `for' variables from inner scopes
689 that we kept around. */
690 for (link = current_binding_level->dead_vars_from_for;
691 link; link = TREE_CHAIN (link))
692 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
694 /* Restore the IDENTIFIER_TYPE_VALUEs. */
695 for (link = current_binding_level->type_shadowed;
696 link; link = TREE_CHAIN (link))
697 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
699 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
700 for (link = current_binding_level->shadowed_labels;
702 link = TREE_CHAIN (link))
703 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
705 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
706 list if a `using' declaration put them there. The debugging
707 back ends won't understand OVERLOAD, so we remove them here.
708 Because the BLOCK_VARS are (temporarily) shared with
709 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
710 popped all the bindings. */
715 for (d = &BLOCK_VARS (block); *d; )
717 if (TREE_CODE (*d) == TREE_LIST)
718 *d = TREE_CHAIN (*d);
720 d = &TREE_CHAIN (*d);
724 /* If the level being exited is the top level of a function,
725 check over all the labels. */
728 /* Since this is the top level block of a function, the vars are
729 the function's parameters. Don't leave them in the BLOCK
730 because they are found in the FUNCTION_DECL instead. */
731 BLOCK_VARS (block) = 0;
735 kind = current_binding_level->kind;
736 if (kind == sk_cleanup)
740 /* If this is a temporary binding created for a cleanup, then we'll
741 have pushed a statement list level. Pop that, create a new
742 BIND_EXPR for the block, and insert it into the stream. */
743 stmt = pop_stmt_list (current_binding_level->statement_list);
744 stmt = c_build_bind_expr (input_location, block, stmt);
751 /* The current function is being defined, so its DECL_INITIAL
752 should be error_mark_node. */
753 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
754 DECL_INITIAL (current_function_decl) = block;
757 current_binding_level->blocks
758 = chainon (current_binding_level->blocks, block);
760 /* If we did not make a block for the level just exited,
761 any blocks made for inner levels
762 (since they cannot be recorded as subblocks in that level)
763 must be carried forward so they will later become subblocks
764 of something else. */
766 current_binding_level->blocks
767 = chainon (current_binding_level->blocks, subblocks);
769 /* Each and every BLOCK node created here in `poplevel' is important
770 (e.g. for proper debugging information) so if we created one
771 earlier, mark it as "used". */
773 TREE_USED (block) = 1;
775 /* All temporary bindings created for cleanups are popped silently. */
776 if (kind == sk_cleanup)
779 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
782 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
783 itself, calling F for each. The DATA is passed to F as well. */
786 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
789 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
791 result |= (*f) (name_space, data);
793 for (; current; current = TREE_CHAIN (current))
794 result |= walk_namespaces_r (current, f, data);
799 /* Walk all the namespaces, calling F for each. The DATA is passed to
803 walk_namespaces (walk_namespaces_fn f, void* data)
805 return walk_namespaces_r (global_namespace, f, data);
808 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
809 DATA is non-NULL, this is the last time we will call
810 wrapup_global_declarations for this NAMESPACE. */
813 wrapup_globals_for_namespace (tree name_space, void* data)
815 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
816 VEC(tree,gc) *statics = level->static_decls;
817 tree *vec = VEC_address (tree, statics);
818 int len = VEC_length (tree, statics);
819 int last_time = (data != 0);
823 check_global_declarations (vec, len);
824 emit_debug_global_declarations (vec, len);
828 /* Write out any globals that need to be output. */
829 return wrapup_global_declarations (vec, len);
833 /* In C++, you don't have to write `struct S' to refer to `S'; you
834 can just use `S'. We accomplish this by creating a TYPE_DECL as
835 if the user had written `typedef struct S S'. Create and return
836 the TYPE_DECL for TYPE. */
839 create_implicit_typedef (tree name, tree type)
843 decl = build_decl (input_location, TYPE_DECL, name, type);
844 DECL_ARTIFICIAL (decl) = 1;
845 /* There are other implicit type declarations, like the one *within*
846 a class that allows you to write `S::S'. We must distinguish
848 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
849 TYPE_NAME (type) = decl;
850 TYPE_STUB_DECL (type) = decl;
855 /* Remember a local name for name-mangling purposes. */
858 push_local_name (tree decl)
863 timevar_push (TV_NAME_LOOKUP);
865 name = DECL_NAME (decl);
867 nelts = VEC_length (tree, local_names);
868 for (i = 0; i < nelts; i++)
870 t = VEC_index (tree, local_names, i);
871 if (DECL_NAME (t) == name)
873 if (!DECL_LANG_SPECIFIC (decl))
874 retrofit_lang_decl (decl);
875 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
876 if (DECL_LANG_SPECIFIC (t))
877 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
879 DECL_DISCRIMINATOR (decl) = 1;
881 VEC_replace (tree, local_names, i, decl);
882 timevar_pop (TV_NAME_LOOKUP);
887 VEC_safe_push (tree, gc, local_names, decl);
888 timevar_pop (TV_NAME_LOOKUP);
891 /* Subroutine of duplicate_decls: return truthvalue of whether
892 or not types of these decls match.
894 For C++, we must compare the parameter list so that `int' can match
895 `int&' in a parameter position, but `int&' is not confused with
899 decls_match (tree newdecl, tree olddecl)
903 if (newdecl == olddecl)
906 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
907 /* If the two DECLs are not even the same kind of thing, we're not
908 interested in their types. */
911 if (TREE_CODE (newdecl) == FUNCTION_DECL)
913 tree f1 = TREE_TYPE (newdecl);
914 tree f2 = TREE_TYPE (olddecl);
915 tree p1 = TYPE_ARG_TYPES (f1);
916 tree p2 = TYPE_ARG_TYPES (f2);
918 /* Specializations of different templates are different functions
919 even if they have the same type. */
920 tree t1 = (DECL_USE_TEMPLATE (newdecl)
921 ? DECL_TI_TEMPLATE (newdecl)
923 tree t2 = (DECL_USE_TEMPLATE (olddecl)
924 ? DECL_TI_TEMPLATE (olddecl)
929 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
930 && ! (DECL_EXTERN_C_P (newdecl)
931 && DECL_EXTERN_C_P (olddecl)))
934 #ifdef NO_IMPLICIT_EXTERN_C
935 /* A new declaration doesn't match a built-in one unless it
936 is also extern "C". */
937 if (DECL_IS_BUILTIN (olddecl)
938 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
942 if (TREE_CODE (f1) != TREE_CODE (f2))
945 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
947 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
948 && (DECL_BUILT_IN (olddecl)
949 #ifndef NO_IMPLICIT_EXTERN_C
950 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
951 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
955 types_match = self_promoting_args_p (p1);
956 if (p1 == void_list_node)
957 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
959 #ifndef NO_IMPLICIT_EXTERN_C
960 else if (p1 == NULL_TREE
961 && (DECL_EXTERN_C_P (olddecl)
962 && DECL_IN_SYSTEM_HEADER (olddecl)
963 && !DECL_CLASS_SCOPE_P (olddecl))
964 && (DECL_EXTERN_C_P (newdecl)
965 && DECL_IN_SYSTEM_HEADER (newdecl)
966 && !DECL_CLASS_SCOPE_P (newdecl)))
968 types_match = self_promoting_args_p (p2);
969 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
973 types_match = compparms (p1, p2);
978 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
980 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
981 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
984 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
985 DECL_TEMPLATE_PARMS (olddecl)))
988 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
989 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
990 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
992 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
993 DECL_TEMPLATE_RESULT (newdecl));
997 /* Need to check scope for variable declaration (VAR_DECL).
998 For typedef (TYPE_DECL), scope is ignored. */
999 if (TREE_CODE (newdecl) == VAR_DECL
1000 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1002 Two declarations for an object with C language linkage
1003 with the same name (ignoring the namespace that qualify
1004 it) that appear in different namespace scopes refer to
1006 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1009 if (TREE_TYPE (newdecl) == error_mark_node)
1010 types_match = TREE_TYPE (olddecl) == error_mark_node;
1011 else if (TREE_TYPE (olddecl) == NULL_TREE)
1012 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1013 else if (TREE_TYPE (newdecl) == NULL_TREE)
1016 types_match = comptypes (TREE_TYPE (newdecl),
1017 TREE_TYPE (olddecl),
1018 COMPARE_REDECLARATION);
1024 /* If NEWDECL is `static' and an `extern' was seen previously,
1025 warn about it. OLDDECL is the previous declaration.
1027 Note that this does not apply to the C++ case of declaring
1028 a variable `extern const' and then later `const'.
1030 Don't complain about built-in functions, since they are beyond
1031 the user's control. */
1034 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1036 if (TREE_CODE (newdecl) == TYPE_DECL
1037 || TREE_CODE (newdecl) == TEMPLATE_DECL
1038 || TREE_CODE (newdecl) == CONST_DECL
1039 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1042 /* Don't get confused by static member functions; that's a different
1044 if (TREE_CODE (newdecl) == FUNCTION_DECL
1045 && DECL_STATIC_FUNCTION_P (newdecl))
1048 /* If the old declaration was `static', or the new one isn't, then
1049 then everything is OK. */
1050 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1053 /* It's OK to declare a builtin function as `static'. */
1054 if (TREE_CODE (olddecl) == FUNCTION_DECL
1055 && DECL_ARTIFICIAL (olddecl))
1058 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1059 permerror (input_location, "previous declaration of %q+D", olddecl);
1062 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1063 function templates. If their exception specifications do not
1064 match, issue a diagnostic. */
1067 check_redeclaration_exception_specification (tree new_decl,
1072 tree new_exceptions;
1073 tree old_exceptions;
1075 new_type = TREE_TYPE (new_decl);
1076 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1077 old_type = TREE_TYPE (old_decl);
1078 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1082 If any declaration of a function has an exception-specification,
1083 all declarations, including the definition and an explicit
1084 specialization, of that function shall have an
1085 exception-specification with the same set of type-ids. */
1086 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1087 && ! DECL_IS_BUILTIN (old_decl)
1089 && !comp_except_specs (new_exceptions, old_exceptions,
1092 error ("declaration of %qF throws different exceptions", new_decl);
1093 error ("from previous declaration %q+F", old_decl);
1097 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1098 && lookup_attribute ("gnu_inline", \
1099 DECL_ATTRIBUTES (fn)))
1101 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1102 If the redeclaration is invalid, a diagnostic is issued, and the
1103 error_mark_node is returned. Otherwise, OLDDECL is returned.
1105 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1108 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1111 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1113 unsigned olddecl_uid = DECL_UID (olddecl);
1114 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1115 int new_defines_function = 0;
1116 tree new_template_info;
1118 if (newdecl == olddecl)
1121 types_match = decls_match (newdecl, olddecl);
1123 /* If either the type of the new decl or the type of the old decl is an
1124 error_mark_node, then that implies that we have already issued an
1125 error (earlier) for some bogus type specification, and in that case,
1126 it is rather pointless to harass the user with yet more error message
1127 about the same declaration, so just pretend the types match here. */
1128 if (TREE_TYPE (newdecl) == error_mark_node
1129 || TREE_TYPE (olddecl) == error_mark_node)
1130 return error_mark_node;
1132 if (DECL_P (olddecl)
1133 && TREE_CODE (newdecl) == FUNCTION_DECL
1134 && TREE_CODE (olddecl) == FUNCTION_DECL
1135 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1137 if (DECL_DECLARED_INLINE_P (newdecl)
1138 && DECL_UNINLINABLE (newdecl)
1139 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1140 /* Already warned elsewhere. */;
1141 else if (DECL_DECLARED_INLINE_P (olddecl)
1142 && DECL_UNINLINABLE (olddecl)
1143 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1144 /* Already warned. */;
1145 else if (DECL_DECLARED_INLINE_P (newdecl)
1146 && DECL_UNINLINABLE (olddecl)
1147 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1149 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1151 warning (OPT_Wattributes, "previous declaration of %q+D "
1152 "with attribute noinline", olddecl);
1154 else if (DECL_DECLARED_INLINE_P (olddecl)
1155 && DECL_UNINLINABLE (newdecl)
1156 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1158 warning (OPT_Wattributes, "function %q+D redeclared with "
1159 "attribute noinline", newdecl);
1160 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1165 /* Check for redeclaration and other discrepancies. */
1166 if (TREE_CODE (olddecl) == FUNCTION_DECL
1167 && DECL_ARTIFICIAL (olddecl))
1169 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1170 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1172 /* Avoid warnings redeclaring built-ins which have not been
1173 explicitly declared. */
1174 if (DECL_ANTICIPATED (olddecl))
1177 /* If you declare a built-in or predefined function name as static,
1178 the old definition is overridden, but optionally warn this was a
1179 bad choice of name. */
1180 if (! TREE_PUBLIC (newdecl))
1182 warning (OPT_Wshadow,
1183 DECL_BUILT_IN (olddecl)
1184 ? G_("shadowing built-in function %q#D")
1185 : G_("shadowing library function %q#D"), olddecl);
1186 /* Discard the old built-in function. */
1189 /* If the built-in is not ansi, then programs can override
1190 it even globally without an error. */
1191 else if (! DECL_BUILT_IN (olddecl))
1192 warning (0, "library function %q#D redeclared as non-function %q#D",
1196 error ("declaration of %q#D", newdecl);
1197 error ("conflicts with built-in declaration %q#D",
1202 else if (!types_match)
1204 /* Avoid warnings redeclaring built-ins which have not been
1205 explicitly declared. */
1206 if (DECL_ANTICIPATED (olddecl))
1208 /* Deal with fileptr_type_node. FILE type is not known
1209 at the time we create the builtins. */
1212 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1213 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1215 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1218 else if (TREE_VALUE (t2) == fileptr_type_node)
1220 tree t = TREE_VALUE (t1);
1222 if (TREE_CODE (t) == POINTER_TYPE
1223 && TYPE_NAME (TREE_TYPE (t))
1224 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1225 == get_identifier ("FILE")
1226 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1228 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1230 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1231 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1232 types_match = decls_match (newdecl, olddecl);
1234 return duplicate_decls (newdecl, olddecl,
1236 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1239 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1242 else if ((DECL_EXTERN_C_P (newdecl)
1243 && DECL_EXTERN_C_P (olddecl))
1244 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1245 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1247 /* A near match; override the builtin. */
1249 if (TREE_PUBLIC (newdecl))
1251 warning (0, "new declaration %q#D", newdecl);
1252 warning (0, "ambiguates built-in declaration %q#D",
1256 warning (OPT_Wshadow,
1257 DECL_BUILT_IN (olddecl)
1258 ? G_("shadowing built-in function %q#D")
1259 : G_("shadowing library function %q#D"), olddecl);
1262 /* Discard the old built-in function. */
1265 /* Replace the old RTL to avoid problems with inlining. */
1266 COPY_DECL_RTL (newdecl, olddecl);
1268 /* Even if the types match, prefer the new declarations type for
1269 built-ins which have not been explicitly declared, for
1270 exception lists, etc... */
1271 else if (DECL_ANTICIPATED (olddecl))
1273 tree type = TREE_TYPE (newdecl);
1274 tree attribs = (*targetm.merge_type_attributes)
1275 (TREE_TYPE (olddecl), type);
1277 type = cp_build_type_attribute_variant (type, attribs);
1278 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1281 /* If a function is explicitly declared "throw ()", propagate that to
1282 the corresponding builtin. */
1283 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1284 && DECL_ANTICIPATED (olddecl)
1285 && TREE_NOTHROW (newdecl)
1286 && !TREE_NOTHROW (olddecl)
1287 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1288 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1290 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1292 /* Whether or not the builtin can throw exceptions has no
1293 bearing on this declarator. */
1294 TREE_NOTHROW (olddecl) = 0;
1296 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1298 /* If a builtin function is redeclared as `static', merge
1299 the declarations, but make the original one static. */
1300 DECL_THIS_STATIC (olddecl) = 1;
1301 TREE_PUBLIC (olddecl) = 0;
1303 /* Make the old declaration consistent with the new one so
1304 that all remnants of the builtin-ness of this function
1305 will be banished. */
1306 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1307 COPY_DECL_RTL (newdecl, olddecl);
1310 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1312 /* C++ Standard, 3.3, clause 4:
1313 "[Note: a namespace name or a class template name must be unique
1314 in its declarative region (7.3.2, clause 14). ]" */
1315 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1316 && TREE_CODE (newdecl) != NAMESPACE_DECL
1317 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1318 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1319 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1320 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1322 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1323 && TREE_CODE (newdecl) != TYPE_DECL)
1324 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1325 && TREE_CODE (olddecl) != TYPE_DECL))
1327 /* We do nothing special here, because C++ does such nasty
1328 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1329 get shadowed, and know that if we need to find a TYPE_DECL
1330 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1331 slot of the identifier. */
1335 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1336 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1337 || (TREE_CODE (olddecl) == FUNCTION_DECL
1338 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1342 error ("%q#D redeclared as different kind of symbol", newdecl);
1343 if (TREE_CODE (olddecl) == TREE_LIST)
1344 olddecl = TREE_VALUE (olddecl);
1345 error ("previous declaration of %q+#D", olddecl);
1347 return error_mark_node;
1349 else if (!types_match)
1351 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1352 /* These are certainly not duplicate declarations; they're
1353 from different scopes. */
1356 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1358 /* The name of a class template may not be declared to refer to
1359 any other template, class, function, object, namespace, value,
1360 or type in the same scope. */
1361 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1362 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1364 error ("declaration of template %q#D", newdecl);
1365 error ("conflicts with previous declaration %q+#D", olddecl);
1367 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1368 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1369 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1370 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1371 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1372 DECL_TEMPLATE_PARMS (olddecl))
1373 /* Template functions can be disambiguated by
1375 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1376 TREE_TYPE (TREE_TYPE (olddecl))))
1378 error ("new declaration %q#D", newdecl);
1379 error ("ambiguates old declaration %q+#D", olddecl);
1383 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1385 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1387 error ("declaration of C function %q#D conflicts with",
1389 error ("previous declaration %q+#D here", olddecl);
1391 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1392 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1394 error ("new declaration %q#D", newdecl);
1395 error ("ambiguates old declaration %q+#D", olddecl);
1396 return error_mark_node;
1403 error ("conflicting declaration %q#D", newdecl);
1404 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1405 return error_mark_node;
1408 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1409 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1410 && (!DECL_TEMPLATE_INFO (newdecl)
1411 || (DECL_TI_TEMPLATE (newdecl)
1412 != DECL_TI_TEMPLATE (olddecl))))
1413 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1414 && (!DECL_TEMPLATE_INFO (olddecl)
1415 || (DECL_TI_TEMPLATE (olddecl)
1416 != DECL_TI_TEMPLATE (newdecl))))))
1417 /* It's OK to have a template specialization and a non-template
1418 with the same type, or to have specializations of two
1419 different templates with the same type. Note that if one is a
1420 specialization, and the other is an instantiation of the same
1421 template, that we do not exit at this point. That situation
1422 can occur if we instantiate a template class, and then
1423 specialize one of its methods. This situation is valid, but
1424 the declarations must be merged in the usual way. */
1426 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1427 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1428 && !DECL_USE_TEMPLATE (newdecl))
1429 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1430 && !DECL_USE_TEMPLATE (olddecl))))
1431 /* One of the declarations is a template instantiation, and the
1432 other is not a template at all. That's OK. */
1434 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1436 /* In [namespace.alias] we have:
1438 In a declarative region, a namespace-alias-definition can be
1439 used to redefine a namespace-alias declared in that declarative
1440 region to refer only to the namespace to which it already
1443 Therefore, if we encounter a second alias directive for the same
1444 alias, we can just ignore the second directive. */
1445 if (DECL_NAMESPACE_ALIAS (newdecl)
1446 && (DECL_NAMESPACE_ALIAS (newdecl)
1447 == DECL_NAMESPACE_ALIAS (olddecl)))
1449 /* [namespace.alias]
1451 A namespace-name or namespace-alias shall not be declared as
1452 the name of any other entity in the same declarative region.
1453 A namespace-name defined at global scope shall not be
1454 declared as the name of any other entity in any global scope
1456 error ("declaration of namespace %qD conflicts with", newdecl);
1457 error ("previous declaration of namespace %q+D here", olddecl);
1458 return error_mark_node;
1462 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1465 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1466 if (DECL_NAME (olddecl) != NULL_TREE)
1467 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1468 ? "%q+#D previously defined here"
1469 : "%q+#D previously declared here", olddecl);
1470 return error_mark_node;
1472 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1473 && DECL_INITIAL (olddecl) != NULL_TREE
1474 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1475 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1477 /* Prototype decl follows defn w/o prototype. */
1478 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1479 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1480 "follows non-prototype definition here");
1482 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1483 || TREE_CODE (olddecl) == VAR_DECL)
1484 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1487 If two declarations of the same function or object
1488 specify different linkage-specifications ..., the program
1489 is ill-formed.... Except for functions with C++ linkage,
1490 a function declaration without a linkage specification
1491 shall not precede the first linkage specification for
1492 that function. A function can be declared without a
1493 linkage specification after an explicit linkage
1494 specification has been seen; the linkage explicitly
1495 specified in the earlier declaration is not affected by
1496 such a function declaration.
1498 DR 563 raises the question why the restrictions on
1499 functions should not also apply to objects. Older
1500 versions of G++ silently ignore the linkage-specification
1508 which is clearly wrong. Therefore, we now treat objects
1510 if (current_lang_depth () == 0)
1512 /* There is no explicit linkage-specification, so we use
1513 the linkage from the previous declaration. */
1514 if (!DECL_LANG_SPECIFIC (newdecl))
1515 retrofit_lang_decl (newdecl);
1516 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1520 error ("previous declaration of %q+#D with %qL linkage",
1521 olddecl, DECL_LANGUAGE (olddecl));
1522 error ("conflicts with new declaration with %qL linkage",
1523 DECL_LANGUAGE (newdecl));
1527 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1529 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1531 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1532 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1535 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1536 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1538 for (; t1 && t1 != void_list_node;
1539 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1540 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1542 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1545 permerror (input_location, "default argument given for parameter %d of %q#D",
1547 permerror (input_location, "after previous specification in %q+#D", olddecl);
1551 error ("default argument given for parameter %d of %q#D",
1553 error ("after previous specification in %q+#D",
1560 /* Do not merge an implicit typedef with an explicit one. In:
1564 typedef class A A __attribute__ ((foo));
1566 the attribute should apply only to the typedef. */
1567 if (TREE_CODE (olddecl) == TYPE_DECL
1568 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1569 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1572 /* If new decl is `static' and an `extern' was seen previously,
1574 warn_extern_redeclared_static (newdecl, olddecl);
1576 /* We have committed to returning 1 at this point. */
1577 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1579 /* Now that functions must hold information normally held
1580 by field decls, there is extra work to do so that
1581 declaration information does not get destroyed during
1583 if (DECL_VINDEX (olddecl))
1584 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1585 if (DECL_CONTEXT (olddecl))
1586 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1587 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1588 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1589 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1590 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1591 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1592 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1593 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1594 SET_OVERLOADED_OPERATOR_CODE
1595 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1596 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1598 /* Optionally warn about more than one declaration for the same
1599 name, but don't warn about a function declaration followed by a
1601 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1602 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1603 /* Don't warn about extern decl followed by definition. */
1604 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1605 /* Don't warn about friends, let add_friend take care of it. */
1606 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1608 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1609 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1612 if (DECL_DELETED_FN (newdecl))
1614 error ("deleted definition of %qD", newdecl);
1615 error ("after previous declaration %q+D", olddecl);
1619 /* Deal with C++: must preserve virtual function table size. */
1620 if (TREE_CODE (olddecl) == TYPE_DECL)
1622 tree newtype = TREE_TYPE (newdecl);
1623 tree oldtype = TREE_TYPE (olddecl);
1625 if (newtype != error_mark_node && oldtype != error_mark_node
1626 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1627 CLASSTYPE_FRIEND_CLASSES (newtype)
1628 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1630 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1633 /* Copy all the DECL_... slots specified in the new decl
1634 except for any that we copy here from the old type. */
1635 DECL_ATTRIBUTES (newdecl)
1636 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1638 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1642 old_result = DECL_TEMPLATE_RESULT (olddecl);
1643 new_result = DECL_TEMPLATE_RESULT (newdecl);
1644 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1645 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1646 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1647 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1649 DECL_ATTRIBUTES (old_result)
1650 = (*targetm.merge_decl_attributes) (old_result, new_result);
1652 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1654 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1655 && DECL_INITIAL (new_result))
1657 if (DECL_INITIAL (old_result))
1658 DECL_UNINLINABLE (old_result) = 1;
1660 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1661 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1662 DECL_NOT_REALLY_EXTERN (old_result)
1663 = DECL_NOT_REALLY_EXTERN (new_result);
1664 DECL_INTERFACE_KNOWN (old_result)
1665 = DECL_INTERFACE_KNOWN (new_result);
1666 DECL_DECLARED_INLINE_P (old_result)
1667 = DECL_DECLARED_INLINE_P (new_result);
1668 DECL_DISREGARD_INLINE_LIMITS (old_result)
1669 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1674 DECL_DECLARED_INLINE_P (old_result)
1675 |= DECL_DECLARED_INLINE_P (new_result);
1676 DECL_DISREGARD_INLINE_LIMITS (old_result)
1677 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1678 check_redeclaration_exception_specification (newdecl, olddecl);
1682 /* If the new declaration is a definition, update the file and
1683 line information on the declaration, and also make
1684 the old declaration the same definition. */
1685 if (DECL_INITIAL (new_result) != NULL_TREE)
1687 DECL_SOURCE_LOCATION (olddecl)
1688 = DECL_SOURCE_LOCATION (old_result)
1689 = DECL_SOURCE_LOCATION (newdecl);
1690 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1691 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1694 DECL_ARGUMENTS (old_result)
1695 = DECL_ARGUMENTS (new_result);
1696 for (parm = DECL_ARGUMENTS (old_result); parm;
1697 parm = TREE_CHAIN (parm))
1698 DECL_CONTEXT (parm) = old_result;
1707 /* Automatically handles default parameters. */
1708 tree oldtype = TREE_TYPE (olddecl);
1711 /* Merge the data types specified in the two decls. */
1712 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1714 /* If merge_types produces a non-typedef type, just use the old type. */
1715 if (TREE_CODE (newdecl) == TYPE_DECL
1716 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1719 if (TREE_CODE (newdecl) == VAR_DECL)
1721 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1722 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1723 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1724 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1725 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1726 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1728 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1729 if (DECL_LANG_SPECIFIC (olddecl)
1730 && CP_DECL_THREADPRIVATE_P (olddecl))
1732 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1733 if (!DECL_LANG_SPECIFIC (newdecl))
1734 retrofit_lang_decl (newdecl);
1736 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1737 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1741 /* Do this after calling `merge_types' so that default
1742 parameters don't confuse us. */
1743 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1744 check_redeclaration_exception_specification (newdecl, olddecl);
1745 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1747 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1748 check_default_args (newdecl);
1750 /* Lay the type out, unless already done. */
1751 if (! same_type_p (newtype, oldtype)
1752 && TREE_TYPE (newdecl) != error_mark_node
1753 && !(processing_template_decl && uses_template_parms (newdecl)))
1754 layout_type (TREE_TYPE (newdecl));
1756 if ((TREE_CODE (newdecl) == VAR_DECL
1757 || TREE_CODE (newdecl) == PARM_DECL
1758 || TREE_CODE (newdecl) == RESULT_DECL
1759 || TREE_CODE (newdecl) == FIELD_DECL
1760 || TREE_CODE (newdecl) == TYPE_DECL)
1761 && !(processing_template_decl && uses_template_parms (newdecl)))
1762 layout_decl (newdecl, 0);
1764 /* Merge the type qualifiers. */
1765 if (TREE_READONLY (newdecl))
1766 TREE_READONLY (olddecl) = 1;
1767 if (TREE_THIS_VOLATILE (newdecl))
1768 TREE_THIS_VOLATILE (olddecl) = 1;
1769 if (TREE_NOTHROW (newdecl))
1770 TREE_NOTHROW (olddecl) = 1;
1772 /* Merge deprecatedness. */
1773 if (TREE_DEPRECATED (newdecl))
1774 TREE_DEPRECATED (olddecl) = 1;
1776 /* Preserve function specific target and optimization options */
1777 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1779 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1780 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1781 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1782 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1784 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1785 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1786 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1787 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1790 /* Merge the initialization information. */
1791 if (DECL_INITIAL (newdecl) == NULL_TREE
1792 && DECL_INITIAL (olddecl) != NULL_TREE)
1794 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1795 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1796 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1798 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1799 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1803 /* Merge the section attribute.
1804 We want to issue an error if the sections conflict but that must be
1805 done later in decl_attributes since we are called before attributes
1807 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1808 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1810 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1812 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1813 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1814 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1815 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1816 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1817 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1818 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1819 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1820 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1821 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1822 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1823 /* Keep the old RTL. */
1824 COPY_DECL_RTL (olddecl, newdecl);
1826 else if (TREE_CODE (newdecl) == VAR_DECL
1827 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1829 /* Keep the old RTL. We cannot keep the old RTL if the old
1830 declaration was for an incomplete object and the new
1831 declaration is not since many attributes of the RTL will
1833 COPY_DECL_RTL (olddecl, newdecl);
1836 /* If cannot merge, then use the new type and qualifiers,
1837 and don't preserve the old rtl. */
1840 /* Clean out any memory we had of the old declaration. */
1841 tree oldstatic = value_member (olddecl, static_aggregates);
1843 TREE_VALUE (oldstatic) = error_mark_node;
1845 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1846 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1847 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1848 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1851 /* Merge the storage class information. */
1852 merge_weak (newdecl, olddecl);
1854 if (DECL_ONE_ONLY (olddecl))
1855 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1857 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1858 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1859 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1860 if (! DECL_EXTERNAL (olddecl))
1861 DECL_EXTERNAL (newdecl) = 0;
1863 new_template_info = NULL_TREE;
1864 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1866 bool new_redefines_gnu_inline = false;
1868 if (new_defines_function
1869 && ((DECL_INTERFACE_KNOWN (olddecl)
1870 && TREE_CODE (olddecl) == FUNCTION_DECL)
1871 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1872 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1873 == FUNCTION_DECL))))
1877 if (TREE_CODE (fn) == TEMPLATE_DECL)
1878 fn = DECL_TEMPLATE_RESULT (olddecl);
1880 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1883 if (!new_redefines_gnu_inline)
1885 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1886 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1887 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1889 DECL_TEMPLATE_INSTANTIATED (newdecl)
1890 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1891 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1893 /* If the OLDDECL is an instantiation and/or specialization,
1894 then the NEWDECL must be too. But, it may not yet be marked
1895 as such if the caller has created NEWDECL, but has not yet
1896 figured out that it is a redeclaration. */
1897 if (!DECL_USE_TEMPLATE (newdecl))
1898 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1900 /* Don't really know how much of the language-specific
1901 values we should copy from old to new. */
1902 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1903 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1904 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1905 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1907 if (LANG_DECL_HAS_MIN (newdecl))
1909 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1910 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1911 if (DECL_TEMPLATE_INFO (newdecl))
1912 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1913 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1915 /* Only functions have these fields. */
1916 if (TREE_CODE (newdecl) == FUNCTION_DECL
1917 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1919 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1920 olddecl_friend = DECL_FRIEND_P (olddecl);
1921 hidden_friend = (DECL_ANTICIPATED (olddecl)
1922 && DECL_HIDDEN_FRIEND_P (olddecl)
1923 && newdecl_is_friend);
1924 DECL_BEFRIENDING_CLASSES (newdecl)
1925 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1926 DECL_BEFRIENDING_CLASSES (olddecl));
1927 /* DECL_THUNKS is only valid for virtual functions,
1928 otherwise it is a DECL_FRIEND_CONTEXT. */
1929 if (DECL_VIRTUAL_P (newdecl))
1930 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1932 /* Only variables have this field. */
1933 else if (TREE_CODE (newdecl) == VAR_DECL
1934 && VAR_HAD_UNKNOWN_BOUND (olddecl))
1935 SET_VAR_HAD_UNKNOWN_BOUND (newdecl);
1938 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1942 /* Merge parameter attributes. */
1943 tree oldarg, newarg;
1944 for (oldarg = DECL_ARGUMENTS(olddecl),
1945 newarg = DECL_ARGUMENTS(newdecl);
1947 oldarg = TREE_CHAIN(oldarg), newarg = TREE_CHAIN(newarg)) {
1948 DECL_ATTRIBUTES (newarg)
1949 = (*targetm.merge_decl_attributes) (oldarg, newarg);
1950 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
1953 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1954 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1956 /* If newdecl is not a specialization, then it is not a
1957 template-related function at all. And that means that we
1958 should have exited above, returning 0. */
1959 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1961 if (DECL_ODR_USED (olddecl))
1962 /* From [temp.expl.spec]:
1964 If a template, a member template or the member of a class
1965 template is explicitly specialized then that
1966 specialization shall be declared before the first use of
1967 that specialization that would cause an implicit
1968 instantiation to take place, in every translation unit in
1969 which such a use occurs. */
1970 error ("explicit specialization of %qD after first use",
1973 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1975 /* Don't propagate visibility from the template to the
1976 specialization here. We'll do that in determine_visibility if
1978 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1980 /* [temp.expl.spec/14] We don't inline explicit specialization
1981 just because the primary template says so. */
1983 else if (new_defines_function && DECL_INITIAL (olddecl))
1985 /* Never inline re-defined extern inline functions.
1986 FIXME: this could be better handled by keeping both
1987 function as separate declarations. */
1988 DECL_UNINLINABLE (newdecl) = 1;
1992 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1993 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1995 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1997 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1998 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2000 DECL_DISREGARD_INLINE_LIMITS (newdecl)
2001 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
2002 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2003 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2006 /* Preserve abstractness on cloned [cd]tors. */
2007 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2009 /* Update newdecl's parms to point at olddecl. */
2010 for (parm = DECL_ARGUMENTS (newdecl); parm;
2011 parm = TREE_CHAIN (parm))
2012 DECL_CONTEXT (parm) = olddecl;
2016 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2017 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2018 COPY_DECL_RTL (newdecl, olddecl);
2020 if (! types_match || new_defines_function)
2022 /* These need to be copied so that the names are available.
2023 Note that if the types do match, we'll preserve inline
2024 info and other bits, but if not, we won't. */
2025 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2026 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2028 if (new_defines_function)
2029 /* If defining a function declared with other language
2030 linkage, use the previously declared language linkage. */
2031 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2032 else if (types_match)
2034 /* If redeclaring a builtin function, and not a definition,
2035 it stays built in. */
2036 if (DECL_BUILT_IN (olddecl))
2038 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2039 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2040 /* If we're keeping the built-in definition, keep the rtl,
2041 regardless of declaration matches. */
2042 COPY_DECL_RTL (olddecl, newdecl);
2045 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2046 /* Don't clear out the arguments if we're just redeclaring a
2048 if (DECL_ARGUMENTS (olddecl))
2049 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2052 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2053 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2055 /* Now preserve various other info from the definition. */
2056 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2057 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2058 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2059 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2061 /* Warn about conflicting visibility specifications. */
2062 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2063 && DECL_VISIBILITY_SPECIFIED (newdecl)
2064 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2066 warning_at (input_location, OPT_Wattributes,
2067 "%q+D: visibility attribute ignored because it", newdecl);
2068 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2069 "conflicts with previous declaration here");
2071 /* Choose the declaration which specified visibility. */
2072 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2074 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2075 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2077 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2078 so keep this behavior. */
2079 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2081 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2082 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2085 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2086 with that from NEWDECL below. */
2087 if (DECL_LANG_SPECIFIC (olddecl))
2089 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2090 != DECL_LANG_SPECIFIC (newdecl));
2091 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2094 /* Merge the USED information. */
2095 if (TREE_USED (olddecl))
2096 TREE_USED (newdecl) = 1;
2097 else if (TREE_USED (newdecl))
2098 TREE_USED (olddecl) = 1;
2099 if (DECL_PRESERVE_P (olddecl))
2100 DECL_PRESERVE_P (newdecl) = 1;
2101 else if (DECL_PRESERVE_P (newdecl))
2102 DECL_PRESERVE_P (olddecl) = 1;
2104 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2108 function_size = sizeof (struct tree_decl_common);
2110 memcpy ((char *) olddecl + sizeof (struct tree_common),
2111 (char *) newdecl + sizeof (struct tree_common),
2112 function_size - sizeof (struct tree_common));
2114 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2115 (char *) newdecl + sizeof (struct tree_decl_common),
2116 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2117 if (new_template_info)
2118 /* If newdecl is a template instantiation, it is possible that
2119 the following sequence of events has occurred:
2121 o A friend function was declared in a class template. The
2122 class template was instantiated.
2124 o The instantiation of the friend declaration was
2125 recorded on the instantiation list, and is newdecl.
2127 o Later, however, instantiate_class_template called pushdecl
2128 on the newdecl to perform name injection. But, pushdecl in
2129 turn called duplicate_decls when it discovered that another
2130 declaration of a global function with the same name already
2133 o Here, in duplicate_decls, we decided to clobber newdecl.
2135 If we're going to do that, we'd better make sure that
2136 olddecl, and not newdecl, is on the list of
2137 instantiations so that if we try to do the instantiation
2138 again we won't get the clobbered declaration. */
2139 reregister_specialization (newdecl,
2145 size_t size = tree_code_size (TREE_CODE (olddecl));
2146 memcpy ((char *) olddecl + sizeof (struct tree_common),
2147 (char *) newdecl + sizeof (struct tree_common),
2148 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2149 switch (TREE_CODE (olddecl))
2159 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2160 (char *) newdecl + sizeof (struct tree_decl_common),
2161 size - sizeof (struct tree_decl_common)
2162 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2166 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2167 (char *) newdecl + sizeof (struct tree_decl_common),
2168 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2169 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2173 DECL_UID (olddecl) = olddecl_uid;
2175 DECL_FRIEND_P (olddecl) = 1;
2178 DECL_ANTICIPATED (olddecl) = 1;
2179 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2182 /* NEWDECL contains the merged attribute lists.
2183 Update OLDDECL to be the same. */
2184 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2186 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2187 so that encode_section_info has a chance to look at the new decl
2188 flags and attributes. */
2189 if (DECL_RTL_SET_P (olddecl)
2190 && (TREE_CODE (olddecl) == FUNCTION_DECL
2191 || (TREE_CODE (olddecl) == VAR_DECL
2192 && TREE_STATIC (olddecl))))
2193 make_decl_rtl (olddecl);
2195 /* The NEWDECL will no longer be needed. Because every out-of-class
2196 declaration of a member results in a call to duplicate_decls,
2197 freeing these nodes represents in a significant savings. */
2203 /* Return zero if the declaration NEWDECL is valid
2204 when the declaration OLDDECL (assumed to be for the same name)
2205 has already been seen.
2206 Otherwise return an error message format string with a %s
2207 where the identifier should go. */
2210 redeclaration_error_message (tree newdecl, tree olddecl)
2212 if (TREE_CODE (newdecl) == TYPE_DECL)
2214 /* Because C++ can put things into name space for free,
2215 constructs like "typedef struct foo { ... } foo"
2216 would look like an erroneous redeclaration. */
2217 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2220 return G_("redefinition of %q#D");
2222 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2224 /* If this is a pure function, its olddecl will actually be
2225 the original initialization to `0' (which we force to call
2226 abort()). Don't complain about redefinition in this case. */
2227 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2228 && DECL_INITIAL (olddecl) == NULL_TREE)
2231 /* If both functions come from different namespaces, this is not
2232 a redeclaration - this is a conflict with a used function. */
2233 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2234 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2235 && ! decls_match (olddecl, newdecl))
2236 return G_("%qD conflicts with used function");
2238 /* We'll complain about linkage mismatches in
2239 warn_extern_redeclared_static. */
2241 /* Defining the same name twice is no good. */
2242 if (DECL_INITIAL (olddecl) != NULL_TREE
2243 && DECL_INITIAL (newdecl) != NULL_TREE)
2245 if (DECL_NAME (olddecl) == NULL_TREE)
2246 return G_("%q#D not declared in class");
2247 else if (!GNU_INLINE_P (olddecl)
2248 || GNU_INLINE_P (newdecl))
2249 return G_("redefinition of %q#D");
2252 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2254 bool olda = GNU_INLINE_P (olddecl);
2255 bool newa = GNU_INLINE_P (newdecl);
2260 return G_("%q+D redeclared inline with "
2261 "%<gnu_inline%> attribute");
2263 return G_("%q+D redeclared inline without "
2264 "%<gnu_inline%> attribute");
2270 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2274 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2276 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2277 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2278 return G_("redefinition of %q#D");
2282 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2283 || (DECL_TEMPLATE_RESULT (newdecl)
2284 == DECL_TEMPLATE_RESULT (olddecl)))
2287 nt = DECL_TEMPLATE_RESULT (newdecl);
2288 if (DECL_TEMPLATE_INFO (nt))
2289 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2290 ot = DECL_TEMPLATE_RESULT (olddecl);
2291 if (DECL_TEMPLATE_INFO (ot))
2292 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2293 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2294 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2295 return G_("redefinition of %q#D");
2297 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2299 bool olda = GNU_INLINE_P (ot);
2300 bool newa = GNU_INLINE_P (nt);
2305 return G_("%q+D redeclared inline with "
2306 "%<gnu_inline%> attribute");
2308 return G_("%q+D redeclared inline without "
2309 "%<gnu_inline%> attribute");
2313 /* Core issue #226 (C++0x):
2315 If a friend function template declaration specifies a
2316 default template-argument, that declaration shall be a
2317 definition and shall be the only declaration of the
2318 function template in the translation unit. */
2319 if ((cxx_dialect != cxx98)
2320 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2321 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2322 /*is_primary=*/1, /*is_partial=*/0,
2323 /*is_friend_decl=*/2))
2324 return G_("redeclaration of friend %q#D "
2325 "may not have default template arguments");
2329 else if (TREE_CODE (newdecl) == VAR_DECL
2330 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2331 && (! DECL_LANG_SPECIFIC (olddecl)
2332 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2333 || DECL_THREAD_LOCAL_P (newdecl)))
2335 /* Only variables can be thread-local, and all declarations must
2336 agree on this property. */
2337 if (DECL_THREAD_LOCAL_P (newdecl))
2338 return G_("thread-local declaration of %q#D follows "
2339 "non-thread-local declaration");
2341 return G_("non-thread-local declaration of %q#D follows "
2342 "thread-local declaration");
2344 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2346 /* The objects have been declared at namespace scope. If either
2347 is a member of an anonymous union, then this is an invalid
2348 redeclaration. For example:
2354 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2355 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2356 return G_("redeclaration of %q#D");
2357 /* If at least one declaration is a reference, there is no
2358 conflict. For example:
2364 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2366 /* Reject two definitions. */
2367 return G_("redefinition of %q#D");
2371 /* Objects declared with block scope: */
2372 /* Reject two definitions, and reject a definition
2373 together with an external reference. */
2374 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2375 return G_("redeclaration of %q#D");
2380 /* Hash and equality functions for the named_label table. */
2383 named_label_entry_hash (const void *data)
2385 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2386 return DECL_UID (ent->label_decl);
2390 named_label_entry_eq (const void *a, const void *b)
2392 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2393 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2394 return ent_a->label_decl == ent_b->label_decl;
2397 /* Create a new label, named ID. */
2400 make_label_decl (tree id, int local_p)
2402 struct named_label_entry *ent;
2406 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2408 DECL_CONTEXT (decl) = current_function_decl;
2409 DECL_MODE (decl) = VOIDmode;
2410 C_DECLARED_LABEL_FLAG (decl) = local_p;
2412 /* Say where one reference is to the label, for the sake of the
2413 error if it is not defined. */
2414 DECL_SOURCE_LOCATION (decl) = input_location;
2416 /* Record the fact that this identifier is bound to this label. */
2417 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2419 /* Create the label htab for the function on demand. */
2421 named_labels = htab_create_ggc (13, named_label_entry_hash,
2422 named_label_entry_eq, NULL);
2424 /* Record this label on the list of labels used in this function.
2425 We do this before calling make_label_decl so that we get the
2426 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2427 ent = GGC_CNEW (struct named_label_entry);
2428 ent->label_decl = decl;
2430 slot = htab_find_slot (named_labels, ent, INSERT);
2431 gcc_assert (*slot == NULL);
2437 /* Look for a label named ID in the current function. If one cannot
2438 be found, create one. (We keep track of used, but undefined,
2439 labels, and complain about them at the end of a function.) */
2442 lookup_label (tree id)
2446 timevar_push (TV_NAME_LOOKUP);
2447 /* You can't use labels at global scope. */
2448 if (current_function_decl == NULL_TREE)
2450 error ("label %qE referenced outside of any function", id);
2451 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2454 /* See if we've already got this label. */
2455 decl = IDENTIFIER_LABEL_VALUE (id);
2456 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2457 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2459 decl = make_label_decl (id, /*local_p=*/0);
2460 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2463 /* Declare a local label named ID. */
2466 declare_local_label (tree id)
2470 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2471 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2472 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2473 current_binding_level->shadowed_labels);
2474 current_binding_level->shadowed_labels = shadow;
2476 decl = make_label_decl (id, /*local_p=*/1);
2477 TREE_VALUE (shadow) = decl;
2482 /* Returns nonzero if it is ill-formed to jump past the declaration of
2483 DECL. Returns 2 if it's also a real problem. */
2486 decl_jump_unsafe (tree decl)
2488 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2489 with automatic storage duration is not in scope to a point where it is
2490 in scope is ill-formed unless the variable has scalar type, class type
2491 with a trivial default constructor and a trivial destructor, a
2492 cv-qualified version of one of these types, or an array of one of the
2493 preceding types and is declared without an initializer (8.5). */
2494 tree type = TREE_TYPE (decl);
2496 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2497 || type == error_mark_node)
2500 type = strip_array_types (type);
2502 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2503 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2506 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2512 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2515 identify_goto (tree decl, const location_t *locus)
2518 permerror (input_location, "jump to label %qD", decl);
2520 permerror (input_location, "jump to case label");
2522 permerror (*locus, " from here");
2525 /* Check that a single previously seen jump to a newly defined label
2526 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2527 the jump context; NAMES are the names in scope in LEVEL at the jump
2528 context; LOCUS is the source position of the jump or 0. Returns
2529 true if all is well. */
2532 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2533 bool exited_omp, const location_t *locus)
2535 struct cp_binding_level *b;
2536 bool identified = false, saw_eh = false, saw_omp = false;
2540 identify_goto (decl, locus);
2541 error (" exits OpenMP structured block");
2542 identified = saw_omp = true;
2545 for (b = current_binding_level; b ; b = b->level_chain)
2547 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2549 for (new_decls = b->names; new_decls != old_decls;
2550 new_decls = TREE_CHAIN (new_decls))
2552 int problem = decl_jump_unsafe (new_decls);
2558 identify_goto (decl, locus);
2562 error (" crosses initialization of %q+#D", new_decls);
2564 permerror (input_location, " enters scope of %q+#D which has "
2565 "non-trivial destructor", new_decls);
2570 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2574 identify_goto (decl, locus);
2577 if (b->kind == sk_try)
2578 error (" enters try block");
2580 error (" enters catch block");
2583 if (b->kind == sk_omp && !saw_omp)
2587 identify_goto (decl, locus);
2590 error (" enters OpenMP structured block");
2599 check_previous_goto (tree decl, struct named_label_use_entry *use)
2601 check_previous_goto_1 (decl, use->binding_level,
2602 use->names_in_scope, use->in_omp_scope,
2603 &use->o_goto_locus);
2607 check_switch_goto (struct cp_binding_level* level)
2609 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2612 /* Check that a new jump to a label DECL is OK. Called by
2613 finish_goto_stmt. */
2616 check_goto (tree decl)
2618 struct named_label_entry *ent, dummy;
2619 bool saw_catch = false, identified = false;
2622 /* We can't know where a computed goto is jumping.
2623 So we assume that it's OK. */
2624 if (TREE_CODE (decl) != LABEL_DECL)
2627 /* We didn't record any information about this label when we created it,
2628 and there's not much point since it's trivial to analyze as a return. */
2629 if (decl == cdtor_label)
2632 dummy.label_decl = decl;
2633 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2634 gcc_assert (ent != NULL);
2636 /* If the label hasn't been defined yet, defer checking. */
2637 if (! DECL_INITIAL (decl))
2639 struct named_label_use_entry *new_use;
2641 /* Don't bother creating another use if the last goto had the
2642 same data, and will therefore create the same set of errors. */
2644 && ent->uses->names_in_scope == current_binding_level->names)
2647 new_use = GGC_NEW (struct named_label_use_entry);
2648 new_use->binding_level = current_binding_level;
2649 new_use->names_in_scope = current_binding_level->names;
2650 new_use->o_goto_locus = input_location;
2651 new_use->in_omp_scope = false;
2653 new_use->next = ent->uses;
2654 ent->uses = new_use;
2658 if (ent->in_try_scope || ent->in_catch_scope
2659 || ent->in_omp_scope || ent->bad_decls)
2661 permerror (input_location, "jump to label %q+D", decl);
2662 permerror (input_location, " from here");
2666 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2668 tree b = TREE_VALUE (bad);
2669 int u = decl_jump_unsafe (b);
2671 if (u > 1 && DECL_ARTIFICIAL (b))
2673 /* Can't skip init of __exception_info. */
2674 error_at (DECL_SOURCE_LOCATION (b), " enters catch block");
2678 error (" skips initialization of %q+#D", b);
2680 permerror (input_location, " enters scope of %q+#D which has "
2681 "non-trivial destructor", b);
2684 if (ent->in_try_scope)
2685 error (" enters try block");
2686 else if (ent->in_catch_scope && !saw_catch)
2687 error (" enters catch block");
2689 if (ent->in_omp_scope)
2690 error (" enters OpenMP structured block");
2691 else if (flag_openmp)
2693 struct cp_binding_level *b;
2694 for (b = current_binding_level; b ; b = b->level_chain)
2696 if (b == ent->binding_level)
2698 if (b->kind == sk_omp)
2702 permerror (input_location, "jump to label %q+D", decl);
2703 permerror (input_location, " from here");
2706 error (" exits OpenMP structured block");
2713 /* Check that a return is ok wrt OpenMP structured blocks.
2714 Called by finish_return_stmt. Returns true if all is well. */
2717 check_omp_return (void)
2719 struct cp_binding_level *b;
2720 for (b = current_binding_level; b ; b = b->level_chain)
2721 if (b->kind == sk_omp)
2723 error ("invalid exit from OpenMP structured block");
2729 /* Define a label, specifying the location in the source file.
2730 Return the LABEL_DECL node for the label. */
2733 define_label (location_t location, tree name)
2735 struct named_label_entry *ent, dummy;
2736 struct cp_binding_level *p;
2739 timevar_push (TV_NAME_LOOKUP);
2741 decl = lookup_label (name);
2743 dummy.label_decl = decl;
2744 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2745 gcc_assert (ent != NULL);
2747 /* After labels, make any new cleanups in the function go into their
2748 own new (temporary) binding contour. */
2749 for (p = current_binding_level;
2750 p->kind != sk_function_parms;
2752 p->more_cleanups_ok = 0;
2754 if (name == get_identifier ("wchar_t"))
2755 permerror (input_location, "label named wchar_t");
2757 if (DECL_INITIAL (decl) != NULL_TREE)
2759 error ("duplicate label %qD", decl);
2760 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2764 struct named_label_use_entry *use;
2766 /* Mark label as having been defined. */
2767 DECL_INITIAL (decl) = error_mark_node;
2768 /* Say where in the source. */
2769 DECL_SOURCE_LOCATION (decl) = location;
2771 ent->binding_level = current_binding_level;
2772 ent->names_in_scope = current_binding_level->names;
2774 for (use = ent->uses; use ; use = use->next)
2775 check_previous_goto (decl, use);
2779 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2784 struct cp_binding_level *level;
2785 struct cp_switch *next;
2786 /* The SWITCH_STMT being built. */
2788 /* A splay-tree mapping the low element of a case range to the high
2789 element, or NULL_TREE if there is no high element. Used to
2790 determine whether or not a new case label duplicates an old case
2791 label. We need a tree, rather than simply a hash table, because
2792 of the GNU case range extension. */
2796 /* A stack of the currently active switch statements. The innermost
2797 switch statement is on the top of the stack. There is no need to
2798 mark the stack for garbage collection because it is only active
2799 during the processing of the body of a function, and we never
2800 collect at that point. */
2802 static struct cp_switch *switch_stack;
2804 /* Called right after a switch-statement condition is parsed.
2805 SWITCH_STMT is the switch statement being parsed. */
2808 push_switch (tree switch_stmt)
2810 struct cp_switch *p = XNEW (struct cp_switch);
2811 p->level = current_binding_level;
2812 p->next = switch_stack;
2813 p->switch_stmt = switch_stmt;
2814 p->cases = splay_tree_new (case_compare, NULL, NULL);
2821 struct cp_switch *cs = switch_stack;
2822 location_t switch_location;
2824 /* Emit warnings as needed. */
2825 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2826 switch_location = EXPR_LOCATION (cs->switch_stmt);
2828 switch_location = input_location;
2829 if (!processing_template_decl)
2830 c_do_switch_warnings (cs->cases, switch_location,
2831 SWITCH_STMT_TYPE (cs->switch_stmt),
2832 SWITCH_STMT_COND (cs->switch_stmt));
2834 splay_tree_delete (cs->cases);
2835 switch_stack = switch_stack->next;
2839 /* Note that we've seen a definition of a case label, and complain if this
2840 is a bad place for one. */
2843 finish_case_label (location_t loc, tree low_value, tree high_value)
2846 struct cp_binding_level *p;
2848 if (processing_template_decl)
2852 /* For templates, just add the case label; we'll do semantic
2853 analysis at instantiation-time. */
2854 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2855 return add_stmt (build_case_label (loc, low_value, high_value, label));
2858 /* Find the condition on which this switch statement depends. */
2859 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2860 if (cond && TREE_CODE (cond) == TREE_LIST)
2861 cond = TREE_VALUE (cond);
2863 if (!check_switch_goto (switch_stack->level))
2864 return error_mark_node;
2866 r = c_add_case_label (loc, switch_stack->cases, cond,
2867 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2868 low_value, high_value);
2870 /* After labels, make any new cleanups in the function go into their
2871 own new (temporary) binding contour. */
2872 for (p = current_binding_level;
2873 p->kind != sk_function_parms;
2875 p->more_cleanups_ok = 0;
2880 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2883 typename_hash (const void* k)
2886 const_tree const t = (const_tree) k;
2888 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2889 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2894 typedef struct typename_info {
2902 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2903 really of type `typename_info*' */
2906 typename_compare (const void * k1, const void * k2)
2908 const_tree const t1 = (const_tree) k1;
2909 const typename_info *const t2 = (const typename_info *) k2;
2911 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2912 && TYPE_CONTEXT (t1) == t2->scope
2913 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2914 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2915 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2918 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2919 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2921 Returns the new TYPENAME_TYPE. */
2923 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2926 build_typename_type (tree context, tree name, tree fullname,
2927 enum tag_types tag_type)
2935 if (typename_htab == NULL)
2936 typename_htab = htab_create_ggc (61, &typename_hash,
2937 &typename_compare, NULL);
2939 ti.scope = FROB_CONTEXT (context);
2941 ti.template_id = fullname;
2942 ti.enum_p = tag_type == enum_type;
2943 ti.class_p = (tag_type == class_type
2944 || tag_type == record_type
2945 || tag_type == union_type);
2946 hash = (htab_hash_pointer (ti.scope)
2947 ^ htab_hash_pointer (ti.name));
2949 /* See if we already have this type. */
2950 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2955 /* Build the TYPENAME_TYPE. */
2956 t = cxx_make_type (TYPENAME_TYPE);
2957 TYPE_CONTEXT (t) = ti.scope;
2958 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2959 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2960 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2962 /* Build the corresponding TYPE_DECL. */
2963 d = build_decl (input_location, TYPE_DECL, name, t);
2964 TYPE_NAME (TREE_TYPE (d)) = d;
2965 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2966 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2967 DECL_ARTIFICIAL (d) = 1;
2969 /* Store it in the hash table. */
2972 /* TYPENAME_TYPEs must always be compared structurally, because
2973 they may or may not resolve down to another type depending on
2974 the currently open classes. */
2975 SET_TYPE_STRUCTURAL_EQUALITY (t);
2981 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2982 provided to name the type. Returns an appropriate type, unless an
2983 error occurs, in which case error_mark_node is returned. If we
2984 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2985 return that, rather than the _TYPE it corresponds to, in other
2986 cases we look through the type decl. If TF_ERROR is set, complain
2987 about errors, otherwise be quiet. */
2990 make_typename_type (tree context, tree name, enum tag_types tag_type,
2991 tsubst_flags_t complain)
2997 if (name == error_mark_node
2998 || context == NULL_TREE
2999 || context == error_mark_node)
3000 return error_mark_node;
3004 if (!(TYPE_LANG_SPECIFIC (name)
3005 && (CLASSTYPE_IS_TEMPLATE (name)
3006 || CLASSTYPE_USE_TEMPLATE (name))))
3007 name = TYPE_IDENTIFIER (name);
3009 /* Create a TEMPLATE_ID_EXPR for the type. */
3010 name = build_nt (TEMPLATE_ID_EXPR,
3011 CLASSTYPE_TI_TEMPLATE (name),
3012 CLASSTYPE_TI_ARGS (name));
3014 else if (TREE_CODE (name) == TYPE_DECL)
3015 name = DECL_NAME (name);
3019 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3021 name = TREE_OPERAND (name, 0);
3022 if (TREE_CODE (name) == TEMPLATE_DECL)
3023 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3024 else if (TREE_CODE (name) == OVERLOAD)
3026 error ("%qD is not a type", name);
3027 return error_mark_node;
3030 if (TREE_CODE (name) == TEMPLATE_DECL)
3032 error ("%qD used without template parameters", name);
3033 return error_mark_node;
3035 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3036 gcc_assert (TYPE_P (context));
3038 if (!MAYBE_CLASS_TYPE_P (context))
3040 if (complain & tf_error)
3041 error ("%q#T is not a class", context);
3042 return error_mark_node;
3045 /* When the CONTEXT is a dependent type, NAME could refer to a
3046 dependent base class of CONTEXT. But look inside it anyway
3047 if CONTEXT is a currently open scope, in case it refers to a
3048 member of the current instantiation or a non-dependent base;
3049 lookup will stop when we hit a dependent base. */
3050 if (!dependent_scope_p (context))
3051 /* We should only set WANT_TYPE when we're a nested typename type.
3052 Then we can give better diagnostics if we find a non-type. */
3053 t = lookup_field (context, name, 2, /*want_type=*/true);
3057 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3058 return build_typename_type (context, name, fullname, tag_type);
3060 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3064 if (complain & tf_error)
3065 error (want_template ? "no class template named %q#T in %q#T"
3066 : "no type named %q#T in %q#T", name, context);
3067 return error_mark_node;
3070 /* Pull out the template from an injected-class-name (or multiple). */
3072 t = maybe_get_template_decl_from_type_decl (t);
3074 if (TREE_CODE (t) == TREE_LIST)
3076 if (complain & tf_error)
3078 error ("lookup of %qT in %qT is ambiguous", name, context);
3079 print_candidates (t);
3081 return error_mark_node;
3084 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3086 if (complain & tf_error)
3087 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3089 return error_mark_node;
3091 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3093 if (complain & tf_error)
3094 error ("%<typename %T::%D%> names %q#T, which is not a type",
3096 return error_mark_node;
3099 if (complain & tf_error)
3100 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3102 /* If we are currently parsing a template and if T is a typedef accessed
3103 through CONTEXT then we need to remember and check access of T at
3104 template instantiation time. */
3105 add_typedef_to_current_template_for_access_check (t, context, input_location);
3108 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3110 /*entering_scope=*/0,
3111 tf_warning_or_error | tf_user);
3113 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3119 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3120 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3121 in which case error_mark_node is returned.
3123 If PARM_LIST is non-NULL, also make sure that the template parameter
3124 list of TEMPLATE_DECL matches.
3126 If COMPLAIN zero, don't complain about any errors that occur. */
3129 make_unbound_class_template (tree context, tree name, tree parm_list,
3130 tsubst_flags_t complain)
3136 name = TYPE_IDENTIFIER (name);
3137 else if (DECL_P (name))
3138 name = DECL_NAME (name);
3139 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3141 if (!dependent_type_p (context)
3142 || currently_open_class (context))
3144 tree tmpl = NULL_TREE;
3146 if (MAYBE_CLASS_TYPE_P (context))
3147 tmpl = lookup_field (context, name, 0, false);
3149 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3151 if (complain & tf_error)
3152 error ("no class template named %q#T in %q#T", name, context);
3153 return error_mark_node;
3157 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3159 if (complain & tf_error)
3161 error ("template parameters do not match template");
3162 error ("%q+D declared here", tmpl);
3164 return error_mark_node;
3167 if (complain & tf_error)
3168 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3173 /* Build the UNBOUND_CLASS_TEMPLATE. */
3174 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3175 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3176 TREE_TYPE (t) = NULL_TREE;
3177 SET_TYPE_STRUCTURAL_EQUALITY (t);
3179 /* Build the corresponding TEMPLATE_DECL. */
3180 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3181 TYPE_NAME (TREE_TYPE (d)) = d;
3182 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3183 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3184 DECL_ARTIFICIAL (d) = 1;
3185 DECL_TEMPLATE_PARMS (d) = parm_list;
3192 /* Push the declarations of builtin types into the namespace.
3193 RID_INDEX is the index of the builtin type in the array
3194 RID_POINTERS. NAME is the name used when looking up the builtin
3195 type. TYPE is the _TYPE node for the builtin type. */
3198 record_builtin_type (enum rid rid_index,
3202 tree rname = NULL_TREE, tname = NULL_TREE;
3203 tree tdecl = NULL_TREE;
3205 if ((int) rid_index < (int) RID_MAX)
3206 rname = ridpointers[(int) rid_index];
3208 tname = get_identifier (name);
3210 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3211 eliminated. Built-in types should not be looked up name; their
3212 names are keywords that the parser can recognize. However, there
3213 is code in c-common.c that uses identifier_global_value to look
3214 up built-in types by name. */
3217 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3218 DECL_ARTIFICIAL (tdecl) = 1;
3219 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3225 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3226 DECL_ARTIFICIAL (tdecl) = 1;
3228 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3231 if (!TYPE_NAME (type))
3232 TYPE_NAME (type) = tdecl;
3235 debug_hooks->type_decl (tdecl, 0);
3238 /* Record one of the standard Java types.
3239 * Declare it as having the given NAME.
3240 * If SIZE > 0, it is the size of one of the integral types;
3241 * otherwise it is the negative of the size of one of the other types. */
3244 record_builtin_java_type (const char* name, int size)
3248 type = build_nonstandard_integer_type (size, 0);
3249 else if (size > -32)
3252 /* "__java_char" or ""__java_boolean". */
3253 type = build_nonstandard_integer_type (-size, 1);
3254 /* Get the signed type cached and attached to the unsigned type,
3255 so it doesn't get garbage-collected at "random" times,
3256 causing potential codegen differences out of different UIDs
3257 and different alias set numbers. */
3258 stype = build_nonstandard_integer_type (-size, 0);
3259 TREE_CHAIN (type) = stype;
3260 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3263 { /* "__java_float" or ""__java_double". */
3264 type = make_node (REAL_TYPE);
3265 TYPE_PRECISION (type) = - size;
3268 record_builtin_type (RID_MAX, name, type);
3269 decl = TYPE_NAME (type);
3271 /* Suppress generate debug symbol entries for these types,
3272 since for normal C++ they are just clutter.
3273 However, push_lang_context undoes this if extern "Java" is seen. */
3274 DECL_IGNORED_P (decl) = 1;
3276 TYPE_FOR_JAVA (type) = 1;
3280 /* Push a type into the namespace so that the back ends ignore it. */
3283 record_unknown_type (tree type, const char* name)
3285 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3286 TYPE_DECL, get_identifier (name), type));
3287 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3288 DECL_IGNORED_P (decl) = 1;
3289 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3290 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3291 TYPE_ALIGN (type) = 1;
3292 TYPE_USER_ALIGN (type) = 0;
3293 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3296 /* A string for which we should create an IDENTIFIER_NODE at
3299 typedef struct predefined_identifier
3301 /* The name of the identifier. */
3302 const char *const name;
3303 /* The place where the IDENTIFIER_NODE should be stored. */
3305 /* Nonzero if this is the name of a constructor or destructor. */
3306 const int ctor_or_dtor_p;
3307 } predefined_identifier;
3309 /* Create all the predefined identifiers. */
3312 initialize_predefined_identifiers (void)
3314 const predefined_identifier *pid;
3316 /* A table of identifiers to create at startup. */
3317 static const predefined_identifier predefined_identifiers[] = {
3318 { "C++", &lang_name_cplusplus, 0 },
3319 { "C", &lang_name_c, 0 },
3320 { "Java", &lang_name_java, 0 },
3321 /* Some of these names have a trailing space so that it is
3322 impossible for them to conflict with names written by users. */
3323 { "__ct ", &ctor_identifier, 1 },
3324 { "__base_ctor ", &base_ctor_identifier, 1 },
3325 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3326 { "__dt ", &dtor_identifier, 1 },
3327 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3328 { "__base_dtor ", &base_dtor_identifier, 1 },
3329 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3330 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3331 { "nelts", &nelts_identifier, 0 },
3332 { THIS_NAME, &this_identifier, 0 },
3333 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3334 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3335 { "_vptr", &vptr_identifier, 0 },
3336 { "__vtt_parm", &vtt_parm_identifier, 0 },
3337 { "::", &global_scope_name, 0 },
3338 { "std", &std_identifier, 0 },
3342 for (pid = predefined_identifiers; pid->name; ++pid)
3344 *pid->node = get_identifier (pid->name);
3345 if (pid->ctor_or_dtor_p)
3346 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3350 /* Create the predefined scalar types of C,
3351 and some nodes representing standard constants (0, 1, (void *)0).
3352 Initialize the global binding level.
3353 Make definitions for built-in primitive functions. */
3356 cxx_init_decl_processing (void)
3359 tree void_ftype_ptr;
3361 build_common_tree_nodes (flag_signed_char);
3363 /* Create all the identifiers we need. */
3364 initialize_predefined_identifiers ();
3366 /* Create the global variables. */
3367 push_to_top_level ();
3369 current_function_decl = NULL_TREE;
3370 current_binding_level = NULL;
3371 /* Enter the global namespace. */
3372 gcc_assert (global_namespace == NULL_TREE);
3373 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3375 TREE_PUBLIC (global_namespace) = 1;
3376 begin_scope (sk_namespace, global_namespace);
3378 current_lang_name = NULL_TREE;
3380 if (flag_visibility_ms_compat)
3381 default_visibility = VISIBILITY_HIDDEN;
3384 current_lang_name = lang_name_c;
3386 /* Create the `std' namespace. */
3387 push_namespace (std_identifier);
3388 std_node = current_namespace;
3391 c_common_nodes_and_builtins ();
3393 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3394 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3395 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3396 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3397 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3398 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3399 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3400 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3402 integer_two_node = build_int_cst (NULL_TREE, 2);
3403 integer_three_node = build_int_cst (NULL_TREE, 3);
3405 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3406 truthvalue_type_node = boolean_type_node;
3407 truthvalue_false_node = boolean_false_node;
3408 truthvalue_true_node = boolean_true_node;
3410 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3413 record_builtin_type (RID_MAX, NULL, string_type_node);
3416 delta_type_node = ptrdiff_type_node;
3417 vtable_index_type = ptrdiff_type_node;
3419 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3420 void_ftype = build_function_type (void_type_node, void_list_node);
3421 void_ftype_ptr = build_function_type (void_type_node,
3422 tree_cons (NULL_TREE,
3426 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3428 /* C++ extensions */
3430 unknown_type_node = make_node (UNKNOWN_TYPE);
3431 record_unknown_type (unknown_type_node, "unknown type");
3433 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3434 TREE_TYPE (unknown_type_node) = unknown_type_node;
3436 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3438 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3439 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3441 init_list_type_node = make_node (UNKNOWN_TYPE);
3442 record_unknown_type (init_list_type_node, "init list");
3445 /* Make sure we get a unique function type, so we can give
3446 its pointer type a name. (This wins for gdb.) */
3447 tree vfunc_type = make_node (FUNCTION_TYPE);
3448 TREE_TYPE (vfunc_type) = integer_type_node;
3449 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3450 layout_type (vfunc_type);
3452 vtable_entry_type = build_pointer_type (vfunc_type);
3454 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3457 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3458 layout_type (vtbl_type_node);
3459 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3460 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3461 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3462 layout_type (vtbl_ptr_type_node);
3463 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3465 push_namespace (get_identifier ("__cxxabiv1"));
3466 abi_node = current_namespace;
3469 global_type_node = make_node (LANG_TYPE);
3470 record_unknown_type (global_type_node, "global type");
3473 current_lang_name = lang_name_cplusplus;
3477 tree bad_alloc_type_node;
3478 tree bad_alloc_decl;
3479 tree newtype, deltype;
3480 tree ptr_ftype_sizetype;
3482 push_namespace (std_identifier);
3483 bad_alloc_id = get_identifier ("bad_alloc");
3484 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3485 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3487 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3488 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3492 = build_function_type (ptr_type_node,
3493 tree_cons (NULL_TREE,
3496 newtype = build_exception_variant
3497 (ptr_ftype_sizetype, add_exception_specifier
3498 (NULL_TREE, bad_alloc_type_node, -1));
3499 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3500 push_cp_library_fn (NEW_EXPR, newtype);
3501 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3502 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3503 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3507 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3509 /* Perform other language dependent initializations. */
3510 init_class_processing ();
3511 init_rtti_processing ();
3512 init_template_processing ();
3514 if (flag_exceptions)
3515 init_exception_processing ();
3517 if (! supports_one_only ())
3520 make_fname_decl = cp_make_fname_decl;
3521 start_fname_decls ();
3523 /* Show we use EH for cleanups. */
3524 if (flag_exceptions)
3525 using_eh_for_cleanups ();
3528 /* Generate an initializer for a function naming variable from
3529 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3530 filled in with the type of the init. */
3533 cp_fname_init (const char* name, tree *type_p)
3535 tree domain = NULL_TREE;
3537 tree init = NULL_TREE;
3542 length = strlen (name);
3543 domain = build_index_type (size_int (length));
3544 init = build_string (length + 1, name);
3547 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3548 type = build_cplus_array_type (type, domain);
3553 TREE_TYPE (init) = type;
3555 init = error_mark_node;
3560 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3561 the decl, LOC is the location to give the decl, NAME is the
3562 initialization string and TYPE_DEP indicates whether NAME depended
3563 on the type of the function. We make use of that to detect
3564 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3565 at the point of first use, so we mustn't push the decl now. */
3568 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3570 const char *const name = (type_dep && processing_template_decl
3571 ? NULL : fname_as_string (type_dep));
3573 tree init = cp_fname_init (name, &type);
3574 tree decl = build_decl (loc, VAR_DECL, id, type);
3577 free (CONST_CAST (char *, name));
3579 /* As we're using pushdecl_with_scope, we must set the context. */
3580 DECL_CONTEXT (decl) = current_function_decl;
3581 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3583 TREE_STATIC (decl) = 1;
3584 TREE_READONLY (decl) = 1;
3585 DECL_ARTIFICIAL (decl) = 1;
3587 TREE_USED (decl) = 1;
3589 if (current_function_decl)
3591 struct cp_binding_level *b = current_binding_level;
3592 while (b->level_chain->kind != sk_function_parms)
3594 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3595 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3596 LOOKUP_ONLYCONVERTING);
3599 pushdecl_top_level_and_finish (decl, init);
3605 builtin_function_1 (tree decl, tree context, bool is_global)
3607 tree id = DECL_NAME (decl);
3608 const char *name = IDENTIFIER_POINTER (id);
3610 retrofit_lang_decl (decl);
3612 DECL_ARTIFICIAL (decl) = 1;
3613 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3614 SET_DECL_LANGUAGE (decl, lang_c);
3615 /* Runtime library routines are, by definition, available in an
3616 external shared object. */
3617 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3618 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3620 DECL_CONTEXT (decl) = context;
3623 pushdecl_top_level (decl);
3627 /* A function in the user's namespace should have an explicit
3628 declaration before it is used. Mark the built-in function as
3629 anticipated but not actually declared. */
3630 if (name[0] != '_' || name[1] != '_')
3631 DECL_ANTICIPATED (decl) = 1;
3632 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3634 size_t len = strlen (name);
3636 /* Treat __*_chk fortification functions as anticipated as well,
3637 unless they are __builtin_*. */
3638 if (len > strlen ("___chk")
3639 && memcmp (name + len - strlen ("_chk"),
3640 "_chk", strlen ("_chk") + 1) == 0)
3641 DECL_ANTICIPATED (decl) = 1;
3648 cxx_builtin_function (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, false);
3662 return builtin_function_1 (decl, NULL_TREE, false);
3665 /* Like cxx_builtin_function, but guarantee the function is added to the global
3666 scope. This is to allow function specific options to add new machine
3667 dependent builtins when the target ISA changes via attribute((target(...)))
3668 which saves space on program startup if the program does not use non-generic
3672 cxx_builtin_function_ext_scope (tree decl)
3675 tree id = DECL_NAME (decl);
3676 const char *name = IDENTIFIER_POINTER (id);
3677 /* All builtins that don't begin with an '_' should additionally
3678 go in the 'std' namespace. */
3681 tree decl2 = copy_node(decl);
3682 push_namespace (std_identifier);
3683 builtin_function_1 (decl2, std_node, true);
3687 return builtin_function_1 (decl, NULL_TREE, true);
3690 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3691 function. Not called directly. */
3694 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3696 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3697 DECL_EXTERNAL (fn) = 1;
3698 TREE_PUBLIC (fn) = 1;
3699 DECL_ARTIFICIAL (fn) = 1;
3700 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3701 SET_DECL_LANGUAGE (fn, lang_c);
3702 /* Runtime library routines are, by definition, available in an
3703 external shared object. */
3704 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3705 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3709 /* Returns the _DECL for a library function with C linkage.
3710 We assume that such functions never throw; if this is incorrect,
3711 callers should unset TREE_NOTHROW. */
3714 build_library_fn (tree name, tree type)
3716 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3717 TREE_NOTHROW (fn) = 1;
3721 /* Returns the _DECL for a library function with C++ linkage. */
3724 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3726 tree fn = build_library_fn_1 (name, operator_code, type);
3727 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3728 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3729 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3733 /* Like build_library_fn, but takes a C string instead of an
3737 build_library_fn_ptr (const char* name, tree type)
3739 return build_library_fn (get_identifier (name), type);
3742 /* Like build_cp_library_fn, but takes a C string instead of an
3746 build_cp_library_fn_ptr (const char* name, tree type)
3748 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3751 /* Like build_library_fn, but also pushes the function so that we will
3752 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3753 may throw exceptions listed in RAISES. */
3756 push_library_fn (tree name, tree type, tree raises)
3761 type = build_exception_variant (type, raises);
3763 fn = build_library_fn (name, type);
3764 pushdecl_top_level (fn);
3768 /* Like build_cp_library_fn, but also pushes the function so that it
3769 will be found by normal lookup. */
3772 push_cp_library_fn (enum tree_code operator_code, tree type)
3774 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3781 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3785 push_void_library_fn (tree name, tree parmtypes)
3787 tree type = build_function_type (void_type_node, parmtypes);
3788 return push_library_fn (name, type, NULL_TREE);
3791 /* Like push_library_fn, but also note that this function throws
3792 and does not return. Used for __throw_foo and the like. */
3795 push_throw_library_fn (tree name, tree type)
3797 tree fn = push_library_fn (name, type, NULL_TREE);
3798 TREE_THIS_VOLATILE (fn) = 1;
3799 TREE_NOTHROW (fn) = 0;
3803 /* When we call finish_struct for an anonymous union, we create
3804 default copy constructors and such. But, an anonymous union
3805 shouldn't have such things; this function undoes the damage to the
3806 anonymous union type T.
3808 (The reason that we create the synthesized methods is that we don't
3809 distinguish `union { int i; }' from `typedef union { int i; } U'.
3810 The first is an anonymous union; the second is just an ordinary
3814 fixup_anonymous_aggr (tree t)
3818 /* Wipe out memory of synthesized methods. */
3819 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3820 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3821 TYPE_HAS_INIT_REF (t) = 0;
3822 TYPE_HAS_CONST_INIT_REF (t) = 0;
3823 TYPE_HAS_ASSIGN_REF (t) = 0;
3824 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3826 /* Splice the implicitly generated functions out of the TYPE_METHODS
3828 q = &TYPE_METHODS (t);
3831 if (DECL_ARTIFICIAL (*q))
3832 *q = TREE_CHAIN (*q);
3834 q = &TREE_CHAIN (*q);
3837 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3838 if (TYPE_METHODS (t))
3840 tree decl = TYPE_MAIN_DECL (t);
3842 if (TREE_CODE (t) != UNION_TYPE)
3843 error_at (DECL_SOURCE_LOCATION (decl),
3844 "an anonymous struct cannot have function members");
3846 error_at (DECL_SOURCE_LOCATION (decl),
3847 "an anonymous union cannot have function members");
3850 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3851 assignment operators (because they cannot have these methods themselves).
3852 For anonymous unions this is already checked because they are not allowed
3853 in any union, otherwise we have to check it. */
3854 if (TREE_CODE (t) != UNION_TYPE)
3858 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3859 if (TREE_CODE (field) == FIELD_DECL)
3861 type = TREE_TYPE (field);
3862 if (CLASS_TYPE_P (type))
3864 if (TYPE_NEEDS_CONSTRUCTING (type))
3865 error ("member %q+#D with constructor not allowed "
3866 "in anonymous aggregate", field);
3867 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3868 error ("member %q+#D with destructor not allowed "
3869 "in anonymous aggregate", field);
3870 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3871 error ("member %q+#D with copy assignment operator "
3872 "not allowed in anonymous aggregate", field);
3878 /* Make sure that a declaration with no declarator is well-formed, i.e.
3879 just declares a tagged type or anonymous union.
3881 Returns the type declared; or NULL_TREE if none. */
3884 check_tag_decl (cp_decl_specifier_seq *declspecs)
3886 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3887 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3888 /* If a class, struct, or enum type is declared by the DECLSPECS
3889 (i.e, if a class-specifier, enum-specifier, or non-typename
3890 elaborated-type-specifier appears in the DECLSPECS),
3891 DECLARED_TYPE is set to the corresponding type. */
3892 tree declared_type = NULL_TREE;
3893 bool error_p = false;
3895 if (declspecs->multiple_types_p)
3896 error ("multiple types in one declaration");
3897 else if (declspecs->redefined_builtin_type)
3899 if (!in_system_header)
3900 permerror (input_location, "redeclaration of C++ built-in type %qT",
3901 declspecs->redefined_builtin_type);
3906 && TYPE_P (declspecs->type)
3907 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3908 && MAYBE_CLASS_TYPE_P (declspecs->type))
3909 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3910 declared_type = declspecs->type;
3911 else if (declspecs->type == error_mark_node)
3913 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3914 permerror (input_location, "declaration does not declare anything");
3915 /* Check for an anonymous union. */
3916 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3917 && TYPE_ANONYMOUS_P (declared_type))
3919 /* 7/3 In a simple-declaration, the optional init-declarator-list
3920 can be omitted only when declaring a class (clause 9) or
3921 enumeration (7.2), that is, when the decl-specifier-seq contains
3922 either a class-specifier, an elaborated-type-specifier with
3923 a class-key (9.1), or an enum-specifier. In these cases and
3924 whenever a class-specifier or enum-specifier is present in the
3925 decl-specifier-seq, the identifiers in these specifiers are among
3926 the names being declared by the declaration (as class-name,
3927 enum-names, or enumerators, depending on the syntax). In such
3928 cases, and except for the declaration of an unnamed bit-field (9.6),
3929 the decl-specifier-seq shall introduce one or more names into the
3930 program, or shall redeclare a name introduced by a previous
3931 declaration. [Example:
3932 enum { }; // ill-formed
3933 typedef class { }; // ill-formed
3937 error ("missing type-name in typedef-declaration");
3940 /* Anonymous unions are objects, so they can have specifiers. */;
3941 SET_ANON_AGGR_TYPE_P (declared_type);
3943 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3944 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3949 if (declspecs->specs[(int)ds_inline]
3950 || declspecs->specs[(int)ds_virtual])
3951 error ("%qs can only be specified for functions",
3952 declspecs->specs[(int)ds_inline]
3953 ? "inline" : "virtual");
3955 && (!current_class_type
3956 || current_scope () != current_class_type))
3957 error ("%<friend%> can only be specified inside a class");
3958 else if (declspecs->specs[(int)ds_explicit])
3959 error ("%<explicit%> can only be specified for constructors");
3960 else if (declspecs->storage_class)
3961 error ("a storage class can only be specified for objects "
3963 else if (declspecs->specs[(int)ds_const]
3964 || declspecs->specs[(int)ds_volatile]
3965 || declspecs->specs[(int)ds_restrict]
3966 || declspecs->specs[(int)ds_thread])
3967 error ("qualifiers can only be specified for objects "
3969 else if (saw_typedef)
3970 warning (0, "%<typedef%> was ignored in this declaration");
3971 else if (declspecs->specs[(int) ds_constexpr])
3972 error ("%<constexpr> cannot be used for type declarations");
3975 return declared_type;
3978 /* Called when a declaration is seen that contains no names to declare.
3979 If its type is a reference to a structure, union or enum inherited
3980 from a containing scope, shadow that tag name for the current scope
3981 with a forward reference.
3982 If its type defines a new named structure or union
3983 or defines an enum, it is valid but we need not do anything here.
3984 Otherwise, it is an error.
3986 C++: may have to grok the declspecs to learn about static,
3987 complain for anonymous unions.
3989 Returns the TYPE declared -- or NULL_TREE if none. */
3992 shadow_tag (cp_decl_specifier_seq *declspecs)
3994 tree t = check_tag_decl (declspecs);
3999 if (declspecs->attributes)
4001 warning (0, "attribute ignored in declaration of %q+#T", t);
4002 warning (0, "attribute for %q+#T must follow the %qs keyword",
4003 t, class_key_or_enum_as_string (t));
4007 if (maybe_process_partial_specialization (t) == error_mark_node)
4010 /* This is where the variables in an anonymous union are
4011 declared. An anonymous union declaration looks like:
4013 because there is no declarator after the union, the parser
4014 sends that declaration here. */
4015 if (ANON_AGGR_TYPE_P (t))
4017 fixup_anonymous_aggr (t);
4019 if (TYPE_FIELDS (t))
4021 tree decl = grokdeclarator (/*declarator=*/NULL,
4022 declspecs, NORMAL, 0, NULL);
4023 finish_anon_union (decl);
4030 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4033 groktypename (cp_decl_specifier_seq *type_specifiers,
4034 const cp_declarator *declarator,
4035 bool is_template_arg)
4039 enum decl_context context
4040 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4041 attrs = type_specifiers->attributes;
4042 type_specifiers->attributes = NULL_TREE;
4043 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4044 if (attrs && type != error_mark_node)
4046 if (CLASS_TYPE_P (type))
4047 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4048 "outside of definition", type);
4049 else if (MAYBE_CLASS_TYPE_P (type))
4050 /* A template type parameter or other dependent type. */
4051 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4052 "type %qT without an associated declaration", type);
4054 cplus_decl_attributes (&type, attrs, 0);
4059 /* Process a DECLARATOR for a function-scope variable declaration,
4060 namespace-scope variable declaration, or function declaration.
4061 (Function definitions go through start_function; class member
4062 declarations appearing in the body of the class go through
4063 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4064 If an error occurs, the error_mark_node is returned instead.
4066 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4067 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4068 for an explicitly defaulted function, or SD_DELETED for an explicitly
4069 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4070 implicitly initialized via a default constructor. ATTRIBUTES and
4071 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4072 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4073 set, the caller is responsible for calling pop_scope. */
4076 start_decl (const cp_declarator *declarator,
4077 cp_decl_specifier_seq *declspecs,
4080 tree prefix_attributes,
4081 tree *pushed_scope_p)
4088 *pushed_scope_p = NULL_TREE;
4090 /* An object declared as __attribute__((deprecated)) suppresses
4091 warnings of uses of other deprecated items. */
4092 if (lookup_attribute ("deprecated", attributes))
4093 deprecated_state = DEPRECATED_SUPPRESS;
4095 attributes = chainon (attributes, prefix_attributes);
4097 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4100 deprecated_state = DEPRECATED_NORMAL;
4102 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4103 || decl == error_mark_node)
4104 return error_mark_node;
4106 context = DECL_CONTEXT (decl);
4110 *pushed_scope_p = push_scope (context);
4112 /* We are only interested in class contexts, later. */
4113 if (TREE_CODE (context) == NAMESPACE_DECL)
4114 context = NULL_TREE;
4118 /* Is it valid for this decl to have an initializer at all?
4119 If not, set INITIALIZED to zero, which will indirectly
4120 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4121 switch (TREE_CODE (decl))
4124 error ("typedef %qD is initialized (use decltype instead)", decl);
4125 return error_mark_node;
4128 if (initialized == SD_DELETED)
4129 /* We'll handle the rest of the semantics later, but we need to
4130 set this now so it's visible to duplicate_decls. */
4131 DECL_DELETED_FN (decl) = 1;
4140 if (! toplevel_bindings_p ()
4141 && DECL_EXTERNAL (decl))
4142 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4144 DECL_EXTERNAL (decl) = 0;
4145 if (toplevel_bindings_p ())
4146 TREE_STATIC (decl) = 1;
4149 /* If this is a typedef that names the class for linkage purposes
4150 (7.1.3p8), apply any attributes directly to the type. */
4151 if (TREE_CODE (decl) == TYPE_DECL
4152 && TAGGED_TYPE_P (TREE_TYPE (decl))
4153 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4154 flags = ATTR_FLAG_TYPE_IN_PLACE;
4158 /* Set attributes here so if duplicate decl, will have proper attributes. */
4159 cplus_decl_attributes (&decl, attributes, flags);
4161 /* Dllimported symbols cannot be defined. Static data members (which
4162 can be initialized in-class and dllimported) go through grokfield,
4163 not here, so we don't need to exclude those decls when checking for
4165 if (initialized && DECL_DLLIMPORT_P (decl))
4167 error ("definition of %q#D is marked %<dllimport%>", decl);
4168 DECL_DLLIMPORT_P (decl) = 0;
4171 /* If #pragma weak was used, mark the decl weak now. */
4172 maybe_apply_pragma_weak (decl);
4174 if (TREE_CODE (decl) == FUNCTION_DECL
4175 && DECL_DECLARED_INLINE_P (decl)
4176 && DECL_UNINLINABLE (decl)
4177 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4178 warning (0, "inline function %q+D given attribute noinline", decl);
4180 if (context && COMPLETE_TYPE_P (complete_type (context)))
4182 if (TREE_CODE (decl) == VAR_DECL)
4184 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4185 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4186 error ("%q#D is not a static member of %q#T", decl, context);
4189 if (DECL_CONTEXT (field) != context)
4191 if (!same_type_p (DECL_CONTEXT (field), context))
4192 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4193 "to be defined as %<%T::%D%>",
4194 DECL_CONTEXT (field), DECL_NAME (decl),
4195 context, DECL_NAME (decl));
4196 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4198 if (processing_specialization
4199 && template_class_depth (context) == 0
4200 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4201 error ("template header not allowed in member definition "
4202 "of explicitly specialized class");
4203 /* Static data member are tricky; an in-class initialization
4204 still doesn't provide a definition, so the in-class
4205 declaration will have DECL_EXTERNAL set, but will have an
4206 initialization. Thus, duplicate_decls won't warn
4207 about this situation, and so we check here. */
4208 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4209 error ("duplicate initialization of %qD", decl);
4210 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4212 if (declspecs->specs[(int) ds_constexpr]
4213 && !DECL_DECLARED_CONSTEXPR_P (field))
4214 error ("%qD declared %<constexpr%> outside its class", field);
4219 tree field = check_classfn (context, decl,
4220 (processing_template_decl
4221 > template_class_depth (context))
4222 ? current_template_parms
4224 if (field && field != error_mark_node
4225 && duplicate_decls (decl, field,
4226 /*newdecl_is_friend=*/false))
4230 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4231 DECL_IN_AGGR_P (decl) = 0;
4232 /* Do not mark DECL as an explicit specialization if it was not
4233 already marked as an instantiation; a declaration should
4234 never be marked as a specialization unless we know what
4235 template is being specialized. */
4236 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4238 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4240 /* [temp.expl.spec] An explicit specialization of a static data
4241 member of a template is a definition if the declaration
4242 includes an initializer; otherwise, it is a declaration.
4244 We check for processing_specialization so this only applies
4245 to the new specialization syntax. */
4246 if (!initialized && processing_specialization)
4247 DECL_EXTERNAL (decl) = 1;
4250 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4251 permerror (input_location, "declaration of %q#D outside of class is not definition",
4254 if (!ensure_literal_type_for_constexpr_object (decl))
4255 return error_mark_node;
4258 was_public = TREE_PUBLIC (decl);
4260 /* Enter this declaration into the symbol table. */
4261 decl = maybe_push_decl (decl);
4263 if (processing_template_decl)
4264 decl = push_template_decl (decl);
4265 if (decl == error_mark_node)
4266 return error_mark_node;
4268 /* Tell the back end to use or not use .common as appropriate. If we say
4269 -fconserve-space, we want this to save .data space, at the expense of
4270 wrong semantics. If we say -fno-conserve-space, we want this to
4271 produce errors about redefs; to do this we force variables into the
4273 if (flag_conserve_space
4274 && TREE_CODE (decl) == VAR_DECL
4275 && TREE_PUBLIC (decl)
4276 && !DECL_THREAD_LOCAL_P (decl)
4277 && !have_global_bss_p ())
4278 DECL_COMMON (decl) = 1;
4280 if (TREE_CODE (decl) == VAR_DECL
4281 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4282 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4284 /* This is a const variable with implicit 'static'. Set
4285 DECL_THIS_STATIC so we can tell it from variables that are
4286 !TREE_PUBLIC because of the anonymous namespace. */
4287 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4288 DECL_THIS_STATIC (decl) = 1;
4291 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4292 start_decl_1 (decl, initialized);
4297 /* Process the declaration of a variable DECL. INITIALIZED is true
4298 iff DECL is explicitly initialized. (INITIALIZED is false if the
4299 variable is initialized via an implicitly-called constructor.)
4300 This function must be called for ordinary variables (including, for
4301 example, implicit instantiations of templates), but must not be
4302 called for template declarations. */
4305 start_decl_1 (tree decl, bool initialized)
4309 bool aggregate_definition_p;
4311 gcc_assert (!processing_template_decl);
4313 if (error_operand_p (decl))
4316 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4318 type = TREE_TYPE (decl);
4319 complete_p = COMPLETE_TYPE_P (type);
4320 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4322 /* If an explicit initializer is present, or if this is a definition
4323 of an aggregate, then we need a complete type at this point.
4324 (Scalars are always complete types, so there is nothing to
4325 check.) This code just sets COMPLETE_P; errors (if necessary)
4326 are issued below. */
4327 if ((initialized || aggregate_definition_p)
4329 && COMPLETE_TYPE_P (complete_type (type)))
4332 /* We will not yet have set TREE_READONLY on DECL if the type
4333 was "const", but incomplete, before this point. But, now, we
4334 have a complete type, so we can try again. */
4335 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4339 /* Is it valid for this decl to have an initializer at all? */
4341 /* Don't allow initializations for incomplete types except for
4342 arrays which might be completed by the initialization. */
4344 ; /* A complete type is ok. */
4345 else if (type_uses_auto (type))
4346 ; /* An auto type is ok. */
4347 else if (TREE_CODE (type) != ARRAY_TYPE)
4349 error ("variable %q#D has initializer but incomplete type", decl);
4350 type = TREE_TYPE (decl) = error_mark_node;
4352 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4354 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4355 error ("elements of array %q#D have incomplete type", decl);
4356 /* else we already gave an error in start_decl. */
4359 else if (aggregate_definition_p && !complete_p)
4361 if (type_uses_auto (type))
4362 error ("declaration of %q#D has no initializer", decl);
4364 error ("aggregate %q#D has incomplete type and cannot be defined",
4366 /* Change the type so that assemble_variable will give
4367 DECL an rtl we can live with: (mem (const_int 0)). */
4368 type = TREE_TYPE (decl) = error_mark_node;
4371 /* Create a new scope to hold this declaration if necessary.
4372 Whether or not a new scope is necessary cannot be determined
4373 until after the type has been completed; if the type is a
4374 specialization of a class template it is not until after
4375 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4376 will be set correctly. */
4377 maybe_push_cleanup_level (type);
4380 /* Handle initialization of references. DECL, TYPE, and INIT have the
4381 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4382 but will be set to a new CLEANUP_STMT if a temporary is created
4383 that must be destroyed subsequently.
4385 Returns an initializer expression to use to initialize DECL, or
4386 NULL if the initialization can be performed statically.
4388 Quotes on semantics can be found in ARM 8.4.3. */
4391 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4395 if (init == NULL_TREE)
4397 if ((DECL_LANG_SPECIFIC (decl) == 0
4398 || DECL_IN_AGGR_P (decl) == 0)
4399 && ! DECL_THIS_EXTERN (decl))
4400 error ("%qD declared as reference but not initialized", decl);
4404 if (TREE_CODE (init) == TREE_LIST)
4405 init = build_x_compound_expr_from_list (init, "initializer");
4407 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4408 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4409 /* Note: default conversion is only called in very special cases. */
4410 init = decay_conversion (init);
4412 /* Convert INIT to the reference type TYPE. This may involve the
4413 creation of a temporary, whose lifetime must be the same as that
4414 of the reference. If so, a DECL_EXPR for the temporary will be
4415 added just after the DECL_EXPR for DECL. That's why we don't set
4416 DECL_INITIAL for local references (instead assigning to them
4417 explicitly); we need to allow the temporary to be initialized
4419 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4421 if (tmp == error_mark_node)
4423 else if (tmp == NULL_TREE)
4425 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4429 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4432 DECL_INITIAL (decl) = tmp;
4437 /* Subroutine of check_initializer. We're initializing a DECL of
4438 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4439 extend the lifetime of the underlying array to match that of the decl,
4440 just like for reference initialization. CLEANUP is as for
4441 grok_reference_init. */
4444 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4446 tree aggr_init, array, arrtype;
4447 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4448 if (error_operand_p (init))
4449 return error_mark_node;
4451 aggr_init = TARGET_EXPR_INITIAL (init);
4452 init = build2 (INIT_EXPR, type, decl, init);
4454 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4455 arrtype = TREE_TYPE (array);
4457 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4458 array = TREE_OPERAND (array, 0);
4459 /* If the array is constant, finish_compound_literal already made it a
4460 static variable and we don't need to do anything here. */
4461 if (decl && TREE_CODE (array) == TARGET_EXPR)
4464 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4465 var = build_address (var);
4466 var = convert (arrtype, var);
4467 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4468 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4473 /* Designated initializers in arrays are not supported in GNU C++.
4474 The parser cannot detect this error since it does not know whether
4475 a given brace-enclosed initializer is for a class type or for an
4476 array. This function checks that CE does not use a designated
4477 initializer. If it does, an error is issued. Returns true if CE
4478 is valid, i.e., does not have a designated initializer. */
4481 check_array_designated_initializer (const constructor_elt *ce)
4483 /* Designated initializers for array elements are not supported. */
4486 /* The parser only allows identifiers as designated
4488 if (ce->index == error_mark_node)
4489 error ("name used in a GNU-style designated "
4490 "initializer for an array");
4493 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4494 error ("name %qD used in a GNU-style designated "
4495 "initializer for an array", ce->index);
4503 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4504 array until we finish parsing the initializer. If that's the
4505 situation we're in, update DECL accordingly. */
4508 maybe_deduce_size_from_array_init (tree decl, tree init)
4510 tree type = TREE_TYPE (decl);
4512 if (TREE_CODE (type) == ARRAY_TYPE
4513 && TYPE_DOMAIN (type) == NULL_TREE
4514 && TREE_CODE (decl) != TYPE_DECL)
4516 /* do_default is really a C-ism to deal with tentative definitions.
4517 But let's leave it here to ease the eventual merge. */
4518 int do_default = !DECL_EXTERNAL (decl);
4519 tree initializer = init ? init : DECL_INITIAL (decl);
4522 /* Check that there are no designated initializers in INIT, as
4523 those are not supported in GNU C++, and as the middle-end
4524 will crash if presented with a non-numeric designated
4526 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4528 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4529 constructor_elt *ce;
4532 VEC_iterate (constructor_elt, v, i, ce);
4534 if (!check_array_designated_initializer (ce))
4540 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4544 error ("initializer fails to determine size of %qD", decl);
4545 TREE_TYPE (decl) = error_mark_node;
4547 else if (failure == 2)
4551 error ("array size missing in %qD", decl);
4552 TREE_TYPE (decl) = error_mark_node;
4554 /* If a `static' var's size isn't known, make it extern as
4555 well as static, so it does not get allocated. If it's not
4556 `static', then don't mark it extern; finish_incomplete_decl
4557 will give it a default size and it will get allocated. */
4558 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4559 DECL_EXTERNAL (decl) = 1;
4561 else if (failure == 3)
4563 error ("zero-size array %qD", decl);
4564 TREE_TYPE (decl) = error_mark_node;
4568 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4570 relayout_decl (decl);
4574 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4575 any appropriate error messages regarding the layout. */
4578 layout_var_decl (tree decl)
4582 type = TREE_TYPE (decl);
4583 if (type == error_mark_node)
4586 /* If we haven't already layed out this declaration, do so now.
4587 Note that we must not call complete type for an external object
4588 because it's type might involve templates that we are not
4589 supposed to instantiate yet. (And it's perfectly valid to say
4590 `extern X x' for some incomplete type `X'.) */
4591 if (!DECL_EXTERNAL (decl))
4592 complete_type (type);
4593 if (!DECL_SIZE (decl)
4594 && TREE_TYPE (decl) != error_mark_node
4595 && (COMPLETE_TYPE_P (type)
4596 || (TREE_CODE (type) == ARRAY_TYPE
4597 && !TYPE_DOMAIN (type)
4598 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4599 layout_decl (decl, 0);
4601 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4603 /* An automatic variable with an incomplete type: that is an error.
4604 Don't talk about array types here, since we took care of that
4605 message in grokdeclarator. */
4606 error ("storage size of %qD isn't known", decl);
4607 TREE_TYPE (decl) = error_mark_node;
4610 /* Keep this code around in case we later want to control debug info
4611 based on whether a type is "used". (jason 1999-11-11) */
4613 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4614 /* Let debugger know it should output info for this type. */
4615 note_debug_info_needed (ttype);
4617 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4618 note_debug_info_needed (DECL_CONTEXT (decl));
4621 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4622 && DECL_SIZE (decl) != NULL_TREE
4623 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4625 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4626 constant_expression_warning (DECL_SIZE (decl));
4629 error ("storage size of %qD isn't constant", decl);
4630 TREE_TYPE (decl) = error_mark_node;
4635 /* If a local static variable is declared in an inline function, or if
4636 we have a weak definition, we must endeavor to create only one
4637 instance of the variable at link-time. */
4640 maybe_commonize_var (tree decl)
4642 /* Static data in a function with comdat linkage also has comdat
4644 if (TREE_STATIC (decl)
4645 /* Don't mess with __FUNCTION__. */
4646 && ! DECL_ARTIFICIAL (decl)
4647 && DECL_FUNCTION_SCOPE_P (decl)
4648 && vague_linkage_p (DECL_CONTEXT (decl)))
4652 /* With weak symbols, we simply make the variable COMDAT;
4653 that will cause copies in multiple translations units to
4655 comdat_linkage (decl);
4659 if (DECL_INITIAL (decl) == NULL_TREE
4660 || DECL_INITIAL (decl) == error_mark_node)
4662 /* Without weak symbols, we can use COMMON to merge
4663 uninitialized variables. */
4664 TREE_PUBLIC (decl) = 1;
4665 DECL_COMMON (decl) = 1;
4669 /* While for initialized variables, we must use internal
4670 linkage -- which means that multiple copies will not
4672 TREE_PUBLIC (decl) = 0;
4673 DECL_COMMON (decl) = 0;
4674 warning_at (input_location, 0,
4675 "sorry: semantics of inline function static "
4676 "data %q+#D are wrong (you'll wind up "
4677 "with multiple copies)", decl);
4678 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4679 " you can work around this by removing "
4684 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4685 /* Set it up again; we might have set DECL_INITIAL since the last
4687 comdat_linkage (decl);
4690 /* Issue an error message if DECL is an uninitialized const variable. */
4693 check_for_uninitialized_const_var (tree decl)
4695 tree type = TREE_TYPE (decl);
4697 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
4698 && DECL_INITIAL (decl) == NULL)
4699 error ("missing initializer for constexpr %qD", decl);
4701 /* ``Unless explicitly declared extern, a const object does not have
4702 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4704 else if (TREE_CODE (decl) == VAR_DECL
4705 && TREE_CODE (type) != REFERENCE_TYPE
4706 && CP_TYPE_CONST_P (type)
4707 && !TYPE_NEEDS_CONSTRUCTING (type)
4708 && !DECL_INITIAL (decl))
4709 error ("uninitialized const %qD", decl);
4713 /* Structure holding the current initializer being processed by reshape_init.
4714 CUR is a pointer to the current element being processed, END is a pointer
4715 after the last element present in the initializer. */
4716 typedef struct reshape_iterator_t
4718 constructor_elt *cur;
4719 constructor_elt *end;
4722 static tree reshape_init_r (tree, reshape_iter *, bool);
4724 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4725 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4726 initialized. If there are no more such fields, the return value
4730 next_initializable_field (tree field)
4733 && (TREE_CODE (field) != FIELD_DECL
4734 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4735 || DECL_ARTIFICIAL (field)))
4736 field = TREE_CHAIN (field);
4741 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4742 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4743 INTEGER_CST representing the size of the array minus one (the maximum index),
4744 or NULL_TREE if the array was declared without specifying the size. D is
4745 the iterator within the constructor. */
4748 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4751 bool sized_array_p = (max_index != NULL_TREE);
4752 unsigned HOST_WIDE_INT max_index_cst = 0;
4753 unsigned HOST_WIDE_INT index;
4755 /* The initializer for an array is always a CONSTRUCTOR. */
4756 new_init = build_constructor (init_list_type_node, NULL);
4760 /* Minus 1 is used for zero sized arrays. */
4761 if (integer_all_onesp (max_index))
4764 if (host_integerp (max_index, 1))
4765 max_index_cst = tree_low_cst (max_index, 1);
4766 /* sizetype is sign extended, not zero extended. */
4768 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4772 /* Loop until there are no more initializers. */
4774 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4779 check_array_designated_initializer (d->cur);
4780 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4781 if (elt_init == error_mark_node)
4782 return error_mark_node;
4783 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4789 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4790 Parameters are the same of reshape_init_r. */
4793 reshape_init_array (tree type, reshape_iter *d)
4795 tree max_index = NULL_TREE;
4797 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4799 if (TYPE_DOMAIN (type))
4800 max_index = array_type_nelts (type);
4802 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4805 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4806 Parameters are the same of reshape_init_r. */
4809 reshape_init_vector (tree type, reshape_iter *d)
4811 tree max_index = NULL_TREE;
4814 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4816 if (COMPOUND_LITERAL_P (d->cur->value))
4818 tree value = d->cur->value;
4819 if (!same_type_p (TREE_TYPE (value), type))
4821 error ("invalid type %qT as initializer for a vector of type %qT",
4822 TREE_TYPE (d->cur->value), type);
4823 value = error_mark_node;
4829 /* For a vector, the representation type is a struct
4830 containing a single member which is an array of the
4831 appropriate size. */
4832 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4833 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4834 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4836 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4839 /* Subroutine of reshape_init_r, processes the initializers for classes
4840 or union. Parameters are the same of reshape_init_r. */
4843 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4848 gcc_assert (CLASS_TYPE_P (type));
4850 /* The initializer for a class is always a CONSTRUCTOR. */
4851 new_init = build_constructor (init_list_type_node, NULL);
4852 field = next_initializable_field (TYPE_FIELDS (type));
4858 An initializer for an aggregate member that is an
4859 empty class shall have the form of an empty
4860 initializer-list {}. */
4861 if (!first_initializer_p)
4863 error ("initializer for %qT must be brace-enclosed", type);
4864 return error_mark_node;
4869 /* Loop through the initializable fields, gathering initializers. */
4870 while (d->cur != d->end)
4874 /* Handle designated initializers, as an extension. */
4877 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4879 if (!field || TREE_CODE (field) != FIELD_DECL)
4881 error ("%qT has no non-static data member named %qD", type,
4883 return error_mark_node;
4887 /* If we processed all the member of the class, we are done. */
4891 field_init = reshape_init_r (TREE_TYPE (field), d,
4892 /*first_initializer_p=*/false);
4893 if (field_init == error_mark_node)
4894 return error_mark_node;
4896 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4900 When a union is initialized with a brace-enclosed
4901 initializer, the braces shall only contain an
4902 initializer for the first member of the union. */
4903 if (TREE_CODE (type) == UNION_TYPE)
4906 field = next_initializable_field (TREE_CHAIN (field));
4912 /* Subroutine of reshape_init, which processes a single initializer (part of
4913 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4914 iterator within the CONSTRUCTOR which points to the initializer to process.
4915 FIRST_INITIALIZER_P is true if this is the first initializer of the
4916 outermost CONSTRUCTOR node. */
4919 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4921 tree init = d->cur->value;
4923 if (error_operand_p (init))
4924 return error_mark_node;
4926 /* A non-aggregate type is always initialized with a single
4928 if (!CP_AGGREGATE_TYPE_P (type))
4930 /* It is invalid to initialize a non-aggregate type with a
4931 brace-enclosed initializer before C++0x.
4932 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4933 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4934 a CONSTRUCTOR (with a record type). */
4935 if (TREE_CODE (init) == CONSTRUCTOR
4936 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4938 if (SCALAR_TYPE_P (type))
4940 error ("braces around scalar initializer for type %qT", type);
4941 init = error_mark_node;
4944 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
4953 All implicit type conversions (clause _conv_) are considered when
4954 initializing the aggregate member with an initializer from an
4955 initializer-list. If the initializer can initialize a member,
4956 the member is initialized. Otherwise, if the member is itself a
4957 non-empty subaggregate, brace elision is assumed and the
4958 initializer is considered for the initialization of the first
4959 member of the subaggregate. */
4960 if (TREE_CODE (init) != CONSTRUCTOR
4961 /* But don't try this for the first initializer, since that would be
4962 looking through the outermost braces; A a2 = { a1 }; is not a
4963 valid aggregate initialization. */
4964 && !first_initializer_p
4965 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
4966 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
4972 /* [dcl.init.string]
4974 A char array (whether plain char, signed char, or unsigned char)
4975 can be initialized by a string-literal (optionally enclosed in
4976 braces); a wchar_t array can be initialized by a wide
4977 string-literal (optionally enclosed in braces). */
4978 if (TREE_CODE (type) == ARRAY_TYPE
4979 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4981 tree str_init = init;
4983 /* Strip one level of braces if and only if they enclose a single
4984 element (as allowed by [dcl.init.string]). */
4985 if (!first_initializer_p
4986 && TREE_CODE (str_init) == CONSTRUCTOR
4987 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4989 str_init = VEC_index (constructor_elt,
4990 CONSTRUCTOR_ELTS (str_init), 0)->value;
4993 /* If it's a string literal, then it's the initializer for the array
4994 as a whole. Otherwise, continue with normal initialization for
4995 array types (one value per array element). */
4996 if (TREE_CODE (str_init) == STRING_CST)
5003 /* The following cases are about aggregates. If we are not within a full
5004 initializer already, and there is not a CONSTRUCTOR, it means that there
5005 is a missing set of braces (that is, we are processing the case for
5006 which reshape_init exists). */
5007 if (!first_initializer_p)
5009 if (TREE_CODE (init) == CONSTRUCTOR)
5011 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5012 /* There is no need to reshape pointer-to-member function
5013 initializers, as they are always constructed correctly
5014 by the front end. */
5016 else if (COMPOUND_LITERAL_P (init))
5017 /* For a nested compound literal, there is no need to reshape since
5018 brace elision is not allowed. Even if we decided to allow it,
5019 we should add a call to reshape_init in finish_compound_literal,
5020 before calling digest_init, so changing this code would still
5021 not be necessary. */
5022 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5026 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5027 return reshape_init (type, init);
5031 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5035 /* Dispatch to specialized routines. */
5036 if (CLASS_TYPE_P (type))
5037 return reshape_init_class (type, d, first_initializer_p);
5038 else if (TREE_CODE (type) == ARRAY_TYPE)
5039 return reshape_init_array (type, d);
5040 else if (TREE_CODE (type) == VECTOR_TYPE)
5041 return reshape_init_vector (type, d);
5046 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5047 brace-enclosed aggregate initializer.
5049 INIT is the CONSTRUCTOR containing the list of initializers describing
5050 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5051 It may not presently match the shape of the TYPE; for example:
5053 struct S { int a; int b; };
5054 struct S a[] = { 1, 2, 3, 4 };
5056 Here INIT will hold a VEC of four elements, rather than a
5057 VEC of two elements, each itself a VEC of two elements. This
5058 routine transforms INIT from the former form into the latter. The
5059 revised CONSTRUCTOR node is returned. */
5062 reshape_init (tree type, tree init)
5064 VEC(constructor_elt, gc) *v;
5068 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5070 v = CONSTRUCTOR_ELTS (init);
5072 /* An empty constructor does not need reshaping, and it is always a valid
5074 if (VEC_empty (constructor_elt, v))
5077 /* Recurse on this CONSTRUCTOR. */
5078 d.cur = VEC_index (constructor_elt, v, 0);
5079 d.end = d.cur + VEC_length (constructor_elt, v);
5081 new_init = reshape_init_r (type, &d, true);
5082 if (new_init == error_mark_node)
5083 return error_mark_node;
5085 /* Make sure all the element of the constructor were used. Otherwise,
5086 issue an error about exceeding initializers. */
5088 error ("too many initializers for %qT", type);
5093 /* Verify array initializer. Returns true if errors have been reported. */
5096 check_array_initializer (tree decl, tree type, tree init)
5098 tree element_type = TREE_TYPE (type);
5100 /* The array type itself need not be complete, because the
5101 initializer may tell us how many elements are in the array.
5102 But, the elements of the array must be complete. */
5103 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5106 error ("elements of array %q#D have incomplete type", decl);
5108 error ("elements of array %q#T have incomplete type", type);
5111 /* It is not valid to initialize a VLA. */
5113 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5114 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5117 error ("variable-sized object %qD may not be initialized", decl);
5119 error ("variable-sized compound literal");
5125 /* Subroutine of check_initializer; args are passed down from that function.
5126 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5129 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5132 int saved_stmts_are_full_exprs_p = 0;
5133 if (building_stmt_tree ())
5135 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5136 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5138 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5139 if (building_stmt_tree ())
5140 current_stmt_tree ()->stmts_are_full_exprs_p =
5141 saved_stmts_are_full_exprs_p;
5145 /* Verify INIT (the initializer for DECL), and record the
5146 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5147 grok_reference_init.
5149 If the return value is non-NULL, it is an expression that must be
5150 evaluated dynamically to initialize DECL. */
5153 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5155 tree type = TREE_TYPE (decl);
5156 tree init_code = NULL;
5158 /* Things that are going to be initialized need to have complete
5160 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5162 if (type == error_mark_node)
5163 /* We will have already complained. */
5166 if (TREE_CODE (type) == ARRAY_TYPE)
5168 if (check_array_initializer (decl, type, init))
5171 else if (!COMPLETE_TYPE_P (type))
5173 error ("%qD has incomplete type", decl);
5174 TREE_TYPE (decl) = error_mark_node;
5178 /* There is no way to make a variable-sized class type in GNU C++. */
5179 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5181 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5183 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5184 if (SCALAR_TYPE_P (type))
5188 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5189 init = build_zero_init (type, NULL_TREE, false);
5191 else if (init_len != 1)
5193 error ("scalar object %qD requires one element in initializer",
5195 TREE_TYPE (decl) = error_mark_node;
5201 if (TREE_CODE (decl) == CONST_DECL)
5203 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5205 DECL_INITIAL (decl) = init;
5207 gcc_assert (init != NULL_TREE);
5210 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5211 init = grok_reference_init (decl, type, init, cleanup);
5214 /* Do not reshape constructors of vectors (they don't need to be
5216 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5218 if (is_std_init_list (type))
5219 return build_init_list_var_init (decl, type, init, cleanup);
5220 else if (TYPE_NON_AGGREGATE_CLASS (type))
5222 /* Don't reshape if the class has constructors. */
5223 if (cxx_dialect == cxx98)
5224 error ("in C++98 %qD must be initialized by constructor, "
5227 init = build_tree_list (NULL_TREE, init);
5229 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5231 error ("opaque vector types cannot be initialized");
5232 init = error_mark_node;
5235 init = reshape_init (type, init);
5238 /* If DECL has an array type without a specific bound, deduce the
5239 array size from the initializer. */
5240 maybe_deduce_size_from_array_init (decl, init);
5241 type = TREE_TYPE (decl);
5242 if (type == error_mark_node)
5245 if (TYPE_NEEDS_CONSTRUCTING (type)
5246 || (CLASS_TYPE_P (type)
5247 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5248 return build_aggr_init_full_exprs (decl, init, flags);
5249 else if (TREE_CODE (init) != TREE_VEC)
5251 init_code = store_init_value (decl, init, flags);
5252 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5253 && DECL_INITIAL (decl)
5254 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5255 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5256 warning (0, "array %qD initialized by parenthesized string literal %qE",
5257 decl, DECL_INITIAL (decl));
5261 else if (DECL_EXTERNAL (decl))
5263 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5264 return build_aggr_init_full_exprs (decl, init, flags);
5265 else if (MAYBE_CLASS_TYPE_P (type))
5267 tree core_type = strip_array_types (type);
5269 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5270 error ("structure %qD with uninitialized const members", decl);
5271 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5272 error ("structure %qD with uninitialized reference members", decl);
5274 check_for_uninitialized_const_var (decl);
5277 check_for_uninitialized_const_var (decl);
5279 if (init && init != error_mark_node)
5280 init_code = build2 (INIT_EXPR, type, decl, init);
5285 /* If DECL is not a local variable, give it RTL. */
5288 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5290 int toplev = toplevel_bindings_p ();
5292 const char *filename;
5294 /* Set the DECL_ASSEMBLER_NAME for the object. */
5297 /* The `register' keyword, when used together with an
5298 asm-specification, indicates that the variable should be
5299 placed in a particular register. */
5300 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5302 set_user_assembler_name (decl, asmspec);
5303 DECL_HARD_REGISTER (decl) = 1;
5307 if (TREE_CODE (decl) == FUNCTION_DECL
5308 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5309 set_builtin_user_assembler_name (decl, asmspec);
5310 set_user_assembler_name (decl, asmspec);
5314 /* Handle non-variables up front. */
5315 if (TREE_CODE (decl) != VAR_DECL)
5317 rest_of_decl_compilation (decl, toplev, at_eof);
5321 /* If we see a class member here, it should be a static data
5323 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5325 gcc_assert (TREE_STATIC (decl));
5326 /* An in-class declaration of a static data member should be
5327 external; it is only a declaration, and not a definition. */
5328 if (init == NULL_TREE)
5329 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5332 /* We don't create any RTL for local variables. */
5333 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5336 /* We defer emission of local statics until the corresponding
5337 DECL_EXPR is expanded. */
5338 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5340 /* We try to defer namespace-scope static constants so that they are
5341 not emitted into the object file unnecessarily. */
5342 filename = input_filename;
5343 if (!DECL_VIRTUAL_P (decl)
5344 && TREE_READONLY (decl)
5345 && DECL_INITIAL (decl) != NULL_TREE
5346 && DECL_INITIAL (decl) != error_mark_node
5348 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5350 && !TREE_PUBLIC (decl))
5352 /* Fool with the linkage of static consts according to #pragma
5354 struct c_fileinfo *finfo = get_fileinfo (filename);
5355 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5357 TREE_PUBLIC (decl) = 1;
5358 DECL_EXTERNAL (decl) = finfo->interface_only;
5363 /* Likewise for template instantiations. */
5364 else if (DECL_LANG_SPECIFIC (decl)
5365 && DECL_IMPLICIT_INSTANTIATION (decl))
5368 /* If we're not deferring, go ahead and assemble the variable. */
5370 rest_of_decl_compilation (decl, toplev, at_eof);
5373 /* walk_tree helper for wrap_temporary_cleanups, below. */
5376 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5378 if (TYPE_P (*stmt_p))
5384 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5386 tree guard = (tree)data;
5387 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5389 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5390 /* Tell honor_protect_cleanup_actions to handle this as a separate
5392 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5394 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5400 /* We're initializing a local variable which has a cleanup GUARD. If there
5401 are any temporaries used in the initializer INIT of this variable, we
5402 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5403 variable will be cleaned up properly if one of them throws.
5405 Unfortunately, there's no way to express this properly in terms of
5406 nesting, as the regions for the temporaries overlap the region for the
5407 variable itself; if there are two temporaries, the variable needs to be
5408 the first thing destroyed if either of them throws. However, we only
5409 want to run the variable's cleanup if it actually got constructed. So
5410 we need to guard the temporary cleanups with the variable's cleanup if
5411 they are run on the normal path, but not if they are run on the
5412 exceptional path. We implement this by telling
5413 honor_protect_cleanup_actions to strip the variable cleanup from the
5414 exceptional path. */
5417 wrap_temporary_cleanups (tree init, tree guard)
5419 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5422 /* Generate code to initialize DECL (a local variable). */
5425 initialize_local_var (tree decl, tree init)
5427 tree type = TREE_TYPE (decl);
5431 gcc_assert (TREE_CODE (decl) == VAR_DECL
5432 || TREE_CODE (decl) == RESULT_DECL);
5433 gcc_assert (!TREE_STATIC (decl));
5435 if (DECL_SIZE (decl) == NULL_TREE)
5437 /* If we used it already as memory, it must stay in memory. */
5438 DECL_INITIAL (decl) = NULL_TREE;
5439 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5443 if (type == error_mark_node)
5446 /* Compute and store the initial value. */
5447 already_used = TREE_USED (decl) || TREE_USED (type);
5449 /* Generate a cleanup, if necessary. */
5450 cleanup = cxx_maybe_build_cleanup (decl);
5452 /* Perform the initialization. */
5455 int saved_stmts_are_full_exprs_p;
5457 /* If we're only initializing a single object, guard the destructors
5458 of any temporaries used in its initializer with its destructor.
5459 This isn't right for arrays because each element initialization is
5460 a full-expression. */
5461 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5462 wrap_temporary_cleanups (init, cleanup);
5464 gcc_assert (building_stmt_tree ());
5465 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5466 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5467 finish_expr_stmt (init);
5468 current_stmt_tree ()->stmts_are_full_exprs_p =
5469 saved_stmts_are_full_exprs_p;
5472 /* Set this to 0 so we can tell whether an aggregate which was
5473 initialized was ever used. Don't do this if it has a
5474 destructor, so we don't complain about the 'resource
5475 allocation is initialization' idiom. Now set
5476 attribute((unused)) on types so decls of that type will be
5477 marked used. (see TREE_USED, above.) */
5478 if (TYPE_NEEDS_CONSTRUCTING (type)
5480 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5481 && DECL_NAME (decl))
5482 TREE_USED (decl) = 0;
5483 else if (already_used)
5484 TREE_USED (decl) = 1;
5487 finish_decl_cleanup (decl, cleanup);
5490 /* DECL is a VAR_DECL for a compiler-generated variable with static
5491 storage duration (like a virtual table) whose initializer is a
5492 compile-time constant. INIT must be either a TREE_LIST of values,
5493 or a CONSTRUCTOR. Initialize the variable and provide it to the
5497 initialize_artificial_var (tree decl, tree init)
5499 gcc_assert (DECL_ARTIFICIAL (decl));
5500 if (TREE_CODE (init) == TREE_LIST)
5501 init = build_constructor_from_list (TREE_TYPE (decl), init);
5502 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5503 DECL_INITIAL (decl) = init;
5504 DECL_INITIALIZED_P (decl) = 1;
5505 determine_visibility (decl);
5506 layout_var_decl (decl);
5507 maybe_commonize_var (decl);
5508 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5511 /* INIT is the initializer for a variable, as represented by the
5512 parser. Returns true iff INIT is value-dependent. */
5515 value_dependent_init_p (tree init)
5517 if (TREE_CODE (init) == TREE_LIST)
5518 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5519 return any_value_dependent_elements_p (init);
5520 else if (TREE_CODE (init) == CONSTRUCTOR)
5521 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5523 VEC(constructor_elt, gc) *elts;
5527 elts = CONSTRUCTOR_ELTS (init);
5528 nelts = VEC_length (constructor_elt, elts);
5529 for (i = 0; i < nelts; ++i)
5530 if (value_dependent_init_p (VEC_index (constructor_elt,
5535 /* It must be a simple expression, e.g., int i = 3; */
5536 return value_dependent_expression_p (init);
5541 /* Finish processing of a declaration;
5542 install its line number and initial value.
5543 If the length of an array type is not known before,
5544 it must be determined now, from the initial value, or it is an error.
5546 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5547 true, then INIT is an integral constant expression.
5549 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5550 if the (init) syntax was used. */
5553 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5554 tree asmspec_tree, int flags)
5558 const char *asmspec = NULL;
5559 int was_readonly = 0;
5560 bool var_definition_p = false;
5561 int saved_processing_template_decl;
5564 if (decl == error_mark_node)
5569 error ("assignment (not initialization) in declaration");
5573 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5574 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5575 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5577 type = TREE_TYPE (decl);
5578 if (type == error_mark_node)
5581 /* Assume no cleanup is required. */
5582 cleanup = NULL_TREE;
5583 saved_processing_template_decl = processing_template_decl;
5585 /* If a name was specified, get the string. */
5586 if (global_scope_p (current_binding_level))
5587 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5588 if (asmspec_tree && asmspec_tree != error_mark_node)
5589 asmspec = TREE_STRING_POINTER (asmspec_tree);
5591 if (current_class_type
5592 && CP_DECL_CONTEXT (decl) == current_class_type
5593 && TYPE_BEING_DEFINED (current_class_type)
5594 && (DECL_INITIAL (decl) || init))
5595 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5597 auto_node = type_uses_auto (type);
5600 if (init == NULL_TREE)
5602 error ("declaration of %q#D has no initializer", decl);
5603 TREE_TYPE (decl) = error_mark_node;
5606 if (TREE_CODE (init) == TREE_LIST)
5607 init = build_x_compound_expr_from_list (init, "initializer");
5608 if (describable_type (init))
5610 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5611 if (type == error_mark_node)
5616 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5619 if (init == ridpointers[(int)RID_DELETE])
5621 /* FIXME check this is 1st decl. */
5622 DECL_DELETED_FN (decl) = 1;
5623 DECL_DECLARED_INLINE_P (decl) = 1;
5624 DECL_INITIAL (decl) = error_mark_node;
5625 FOR_EACH_CLONE (clone, decl)
5627 DECL_DELETED_FN (clone) = 1;
5628 DECL_DECLARED_INLINE_P (clone) = 1;
5629 DECL_INITIAL (clone) = error_mark_node;
5633 else if (init == ridpointers[(int)RID_DEFAULT])
5635 if (defaultable_fn_check (decl))
5636 DECL_DEFAULTED_FN (decl) = 1;
5638 DECL_INITIAL (decl) = NULL_TREE;
5642 if (processing_template_decl)
5644 bool type_dependent_p;
5646 /* Add this declaration to the statement-tree. */
5647 if (at_function_scope_p ())
5648 add_decl_expr (decl);
5650 type_dependent_p = dependent_type_p (type);
5652 if (check_for_bare_parameter_packs (init))
5655 DECL_INITIAL (decl) = NULL_TREE;
5658 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5660 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5661 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5662 TREE_CONSTANT (decl) = 1;
5665 /* Generally, initializers in templates are expanded when the
5666 template is instantiated. But, if DECL is an integral
5667 constant static data member, then it can be used in future
5668 integral constant expressions, and its value must be
5671 && DECL_CLASS_SCOPE_P (decl)
5672 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5673 && !type_dependent_p
5674 && !value_dependent_init_p (init)))
5677 DECL_INITIAL (decl) = init;
5678 if (TREE_CODE (decl) == VAR_DECL
5679 && !DECL_PRETTY_FUNCTION_P (decl)
5680 && !type_dependent_p)
5681 maybe_deduce_size_from_array_init (decl, init);
5685 if (TREE_CODE (init) == TREE_LIST)
5687 /* If the parenthesized-initializer form was used (e.g.,
5688 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5689 arguments. (There is generally only one.) We convert them
5692 for (; list; list = TREE_CHAIN (list))
5694 tree elt = TREE_VALUE (list);
5695 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5699 init = fold_non_dependent_expr (init);
5700 processing_template_decl = 0;
5703 /* Take care of TYPE_DECLs up front. */
5704 if (TREE_CODE (decl) == TYPE_DECL)
5706 if (type != error_mark_node
5707 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5709 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5710 warning (0, "shadowing previous type declaration of %q#D", decl);
5711 set_identifier_type_value (DECL_NAME (decl), decl);
5714 /* If we have installed this as the canonical typedef for this
5715 type, and that type has not been defined yet, delay emitting
5716 the debug information for it, as we will emit it later. */
5717 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5718 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5719 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5721 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5726 /* A reference will be modified here, as it is initialized. */
5727 if (! DECL_EXTERNAL (decl)
5728 && TREE_READONLY (decl)
5729 && TREE_CODE (type) == REFERENCE_TYPE)
5732 TREE_READONLY (decl) = 0;
5735 if (TREE_CODE (decl) == VAR_DECL)
5737 /* Only variables with trivial initialization and destruction can
5738 have thread-local storage. */
5739 if (DECL_THREAD_LOCAL_P (decl)
5740 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5741 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5742 error ("%qD cannot be thread-local because it has non-trivial "
5743 "type %qT", decl, TREE_TYPE (decl));
5744 /* If this is a local variable that will need a mangled name,
5745 register it now. We must do this before processing the
5746 initializer for the variable, since the initialization might
5747 require a guard variable, and since the mangled name of the
5748 guard variable will depend on the mangled name of this
5750 if (DECL_FUNCTION_SCOPE_P (decl)
5751 && TREE_STATIC (decl)
5752 && !DECL_ARTIFICIAL (decl))
5754 push_local_name (decl);
5755 if (DECL_CONSTRUCTOR_P (current_function_decl)
5756 || DECL_DESTRUCTOR_P (current_function_decl))
5757 /* Normally local_decls is populated during GIMPLE lowering,
5758 but [cd]tors are never actually compiled directly. We need
5759 to put statics on the list so we can deal with the label
5760 address extension. */
5761 cfun->local_decls = tree_cons (NULL_TREE, decl,
5765 /* Convert the initializer to the type of DECL, if we have not
5766 already initialized DECL. */
5767 if (!DECL_INITIALIZED_P (decl)
5768 /* If !DECL_EXTERNAL then DECL is being defined. In the
5769 case of a static data member initialized inside the
5770 class-specifier, there can be an initializer even if DECL
5771 is *not* defined. */
5772 && (!DECL_EXTERNAL (decl) || init))
5774 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5777 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5778 /* Allow libjava/prims.cc define primitive classes. */
5779 if (init != NULL_TREE
5780 || jclass == NULL_TREE
5781 || TREE_CODE (jclass) != TYPE_DECL
5782 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5783 || !same_type_ignoring_top_level_qualifiers_p
5784 (type, TREE_TYPE (TREE_TYPE (jclass))))
5785 error ("Java object %qD not allocated with %<new%>", decl);
5790 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5791 if (init_const_expr_p)
5793 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5794 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5795 TREE_CONSTANT (decl) = 1;
5798 init = check_initializer (decl, init, flags, &cleanup);
5799 /* Thread-local storage cannot be dynamically initialized. */
5800 if (DECL_THREAD_LOCAL_P (decl) && init)
5802 error ("%qD is thread-local and so cannot be dynamically "
5803 "initialized", decl);
5807 /* Check that the initializer for a static data member was a
5808 constant. Although we check in the parser that the
5809 initializer is an integral constant expression, we do not
5810 simplify division-by-zero at the point at which it
5811 occurs. Therefore, in:
5813 struct S { static const int i = 7 / 0; };
5815 we issue an error at this point. It would
5816 probably be better to forbid division by zero in
5817 integral constant expressions. */
5818 if (DECL_EXTERNAL (decl) && init)
5820 error ("%qD cannot be initialized by a non-constant expression"
5821 " when being declared", decl);
5822 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5830 The memory occupied by any object of static storage
5831 duration is zero-initialized at program startup before
5832 any other initialization takes place.
5834 We cannot create an appropriate initializer until after
5835 the type of DECL is finalized. If DECL_INITIAL is set,
5836 then the DECL is statically initialized, and any
5837 necessary zero-initialization has already been performed. */
5838 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5839 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5840 /*nelts=*/NULL_TREE,
5841 /*static_storage_p=*/true);
5842 /* Remember that the initialization for this variable has
5844 DECL_INITIALIZED_P (decl) = 1;
5845 /* This declaration is the definition of this variable,
5846 unless we are initializing a static data member within
5847 the class specifier. */
5848 if (!DECL_EXTERNAL (decl))
5849 var_definition_p = true;
5851 /* If the variable has an array type, lay out the type, even if
5852 there is no initializer. It is valid to index through the
5853 array, and we must get TYPE_ALIGN set correctly on the array
5855 else if (TREE_CODE (type) == ARRAY_TYPE)
5858 if (!processing_template_decl
5859 && TREE_STATIC (decl)
5860 && !at_function_scope_p ()
5861 && current_function_decl == NULL)
5862 /* So decl is a global variable or a static member of a
5863 non local class. Record the types it uses
5864 so that we can decide later to emit debug info for them. */
5865 record_types_used_by_current_var_decl (decl);
5867 else if (TREE_CODE (decl) == FIELD_DECL
5868 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5869 error ("non-static data member %qD has Java class type", decl);
5871 /* Add this declaration to the statement-tree. This needs to happen
5872 after the call to check_initializer so that the DECL_EXPR for a
5873 reference temp is added before the DECL_EXPR for the reference itself. */
5874 if (at_function_scope_p ())
5875 add_decl_expr (decl);
5877 /* Let the middle end know about variables and functions -- but not
5878 static data members in uninstantiated class templates. */
5879 if (!saved_processing_template_decl
5880 && (TREE_CODE (decl) == VAR_DECL
5881 || TREE_CODE (decl) == FUNCTION_DECL))
5883 if (TREE_CODE (decl) == VAR_DECL)
5885 layout_var_decl (decl);
5886 maybe_commonize_var (decl);
5889 /* This needs to happen after the linkage is set. */
5890 determine_visibility (decl);
5892 if (var_definition_p && TREE_STATIC (decl))
5894 /* If a TREE_READONLY variable needs initialization
5895 at runtime, it is no longer readonly and we need to
5896 avoid MEM_READONLY_P being set on RTL created for it. */
5899 if (TREE_READONLY (decl))
5900 TREE_READONLY (decl) = 0;
5903 else if (was_readonly)
5904 TREE_READONLY (decl) = 1;
5907 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5909 /* Check for abstractness of the type. Notice that there is no
5910 need to strip array types here since the check for those types
5911 is already done within create_array_type_for_decl. */
5912 if (TREE_CODE (type) == FUNCTION_TYPE
5913 || TREE_CODE (type) == METHOD_TYPE)
5914 abstract_virtuals_error (decl, TREE_TYPE (type));
5916 abstract_virtuals_error (decl, type);
5918 if (TREE_TYPE (decl) == error_mark_node)
5919 /* No initialization required. */
5921 else if (TREE_CODE (decl) == FUNCTION_DECL)
5925 if (init == ridpointers[(int)RID_DEFAULT])
5927 /* An out-of-class default definition is defined at
5928 the point where it is explicitly defaulted. */
5929 if (DECL_INITIAL (decl) == error_mark_node)
5930 synthesize_method (decl);
5933 error ("function %q#D is initialized like a variable", decl);
5935 /* else no initialization required. */
5937 else if (DECL_EXTERNAL (decl)
5938 && ! (DECL_LANG_SPECIFIC (decl)
5939 && DECL_NOT_REALLY_EXTERN (decl)))
5942 DECL_INITIAL (decl) = init;
5944 /* A variable definition. */
5945 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5946 /* Initialize the local variable. */
5947 initialize_local_var (decl, init);
5949 /* If a variable is defined, and then a subsequent
5950 definition with external linkage is encountered, we will
5951 get here twice for the same variable. We want to avoid
5952 calling expand_static_init more than once. For variables
5953 that are not static data members, we can call
5954 expand_static_init only when we actually process the
5955 initializer. It is not legal to redeclare a static data
5956 member, so this issue does not arise in that case. */
5957 else if (var_definition_p && TREE_STATIC (decl))
5958 expand_static_init (decl, init);
5961 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5962 reference, insert it in the statement-tree now. */
5964 push_cleanup (decl, cleanup, false);
5967 processing_template_decl = saved_processing_template_decl;
5970 TREE_READONLY (decl) = 1;
5972 /* If this was marked 'used', be sure it will be output. */
5973 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5974 mark_decl_referenced (decl);
5977 /* Returns a declaration for a VAR_DECL as if:
5979 extern "C" TYPE NAME;
5981 had been seen. Used to create compiler-generated global
5985 declare_global_var (tree name, tree type)
5989 push_to_top_level ();
5990 decl = build_decl (input_location, VAR_DECL, name, type);
5991 TREE_PUBLIC (decl) = 1;
5992 DECL_EXTERNAL (decl) = 1;
5993 DECL_ARTIFICIAL (decl) = 1;
5994 /* If the user has explicitly declared this variable (perhaps
5995 because the code we are compiling is part of a low-level runtime
5996 library), then it is possible that our declaration will be merged
5997 with theirs by pushdecl. */
5998 decl = pushdecl (decl);
5999 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
6000 pop_from_top_level ();
6005 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
6006 if "__cxa_atexit" is not being used) corresponding to the function
6007 to be called when the program exits. */
6010 get_atexit_fn_ptr_type (void)
6015 if (!atexit_fn_ptr_type_node)
6017 if (flag_use_cxa_atexit
6018 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6019 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6020 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6022 /* The parameter to "atexit" is "void (*)(void)". */
6023 arg_types = void_list_node;
6025 fn_type = build_function_type (void_type_node, arg_types);
6026 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6029 return atexit_fn_ptr_type_node;
6032 /* Returns a pointer to the `atexit' function. Note that if
6033 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6034 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6037 get_atexit_node (void)
6044 bool use_aeabi_atexit;
6049 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6051 /* The declaration for `__cxa_atexit' is:
6053 int __cxa_atexit (void (*)(void *), void *, void *)
6055 We build up the argument types and then then function type
6058 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6059 /* First, build the pointer-to-function type for the first
6061 fn_ptr_type = get_atexit_fn_ptr_type ();
6062 /* Then, build the rest of the argument types. */
6063 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6064 if (use_aeabi_atexit)
6066 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6067 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6071 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6072 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6074 /* And the final __cxa_atexit type. */
6075 fn_type = build_function_type (integer_type_node, arg_types);
6076 fn_ptr_type = build_pointer_type (fn_type);
6077 if (use_aeabi_atexit)
6078 name = "__aeabi_atexit";
6080 name = "__cxa_atexit";
6084 /* The declaration for `atexit' is:
6086 int atexit (void (*)());
6088 We build up the argument types and then then function type
6090 fn_ptr_type = get_atexit_fn_ptr_type ();
6091 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
6092 /* Build the final atexit type. */
6093 fn_type = build_function_type (integer_type_node, arg_types);
6097 /* Now, build the function declaration. */
6098 push_lang_context (lang_name_c);
6099 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6100 mark_used (atexit_fndecl);
6101 pop_lang_context ();
6102 atexit_node = decay_conversion (atexit_fndecl);
6107 /* Returns the __dso_handle VAR_DECL. */
6110 get_dso_handle_node (void)
6112 if (dso_handle_node)
6113 return dso_handle_node;
6115 /* Declare the variable. */
6116 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6119 return dso_handle_node;
6122 /* Begin a new function with internal linkage whose job will be simply
6123 to destroy some particular variable. */
6125 static GTY(()) int start_cleanup_cnt;
6128 start_cleanup_fn (void)
6133 bool use_cxa_atexit = flag_use_cxa_atexit
6134 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6136 push_to_top_level ();
6138 /* No need to mangle this. */
6139 push_lang_context (lang_name_c);
6141 /* Build the name of the function. */
6142 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6143 /* Build the function declaration. */
6144 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6145 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6146 /* It's a function with internal linkage, generated by the
6148 TREE_PUBLIC (fndecl) = 0;
6149 DECL_ARTIFICIAL (fndecl) = 1;
6150 /* Make the function `inline' so that it is only emitted if it is
6151 actually needed. It is unlikely that it will be inlined, since
6152 it is only called via a function pointer, but we avoid unnecessary
6153 emissions this way. */
6154 DECL_DECLARED_INLINE_P (fndecl) = 1;
6155 DECL_INTERFACE_KNOWN (fndecl) = 1;
6156 /* Build the parameter. */
6161 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6162 DECL_CONTEXT (parmdecl) = fndecl;
6163 TREE_USED (parmdecl) = 1;
6164 DECL_ARGUMENTS (fndecl) = parmdecl;
6168 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6170 pop_lang_context ();
6172 return current_function_decl;
6175 /* Finish the cleanup function begun by start_cleanup_fn. */
6178 end_cleanup_fn (void)
6180 expand_or_defer_fn (finish_function (0));
6182 pop_from_top_level ();
6185 /* Generate code to handle the destruction of DECL, an object with
6186 static storage duration. */
6189 register_dtor_fn (tree decl)
6198 type = TREE_TYPE (decl);
6199 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6200 return void_zero_node;
6202 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6203 a class object, we can just pass the destructor to
6204 "__cxa_atexit"; we don't have to build a temporary function to do
6206 use_dtor = (flag_use_cxa_atexit
6207 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6208 && CLASS_TYPE_P (type));
6213 /* Find the destructor. */
6214 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6215 gcc_assert (idx >= 0);
6216 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6217 /* Make sure it is accessible. */
6218 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6222 /* Call build_cleanup before we enter the anonymous function so
6223 that any access checks will be done relative to the current
6224 scope, rather than the scope of the anonymous function. */
6225 build_cleanup (decl);
6227 /* Now start the function. */
6228 cleanup = start_cleanup_fn ();
6230 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6231 to the original function, rather than the anonymous one. That
6232 will make the back end think that nested functions are in use,
6233 which causes confusion. */
6234 push_deferring_access_checks (dk_no_check);
6235 fcall = build_cleanup (decl);
6236 pop_deferring_access_checks ();
6238 /* Create the body of the anonymous function. */
6239 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6240 finish_expr_stmt (fcall);
6241 finish_compound_stmt (compound_stmt);
6245 /* Call atexit with the cleanup function. */
6246 mark_used (cleanup);
6247 cleanup = build_address (cleanup);
6248 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6254 /* We must convert CLEANUP to the type that "__cxa_atexit"
6256 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6257 /* "__cxa_atexit" will pass the address of DECL to the
6258 cleanup function. */
6260 addr = build_address (decl);
6261 /* The declared type of the parameter to "__cxa_atexit" is
6262 "void *". For plain "T*", we could just let the
6263 machinery in cp_build_function_call convert it -- but if the
6264 type is "cv-qualified T *", then we need to convert it
6265 before passing it in, to avoid spurious errors. */
6266 addr = build_nop (ptr_type_node, addr);
6269 /* Since the cleanup functions we build ignore the address
6270 they're given, there's no reason to pass the actual address
6271 in, and, in general, it's cheaper to pass NULL than any
6273 addr = null_pointer_node;
6274 args = tree_cons (NULL_TREE,
6275 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6276 tf_warning_or_error),
6278 if (targetm.cxx.use_aeabi_atexit ())
6280 args = tree_cons (NULL_TREE, cleanup, args);
6281 args = tree_cons (NULL_TREE, addr, args);
6285 args = tree_cons (NULL_TREE, addr, args);
6286 args = tree_cons (NULL_TREE, cleanup, args);
6290 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6291 return cp_build_function_call (get_atexit_node (), args,
6292 tf_warning_or_error);
6295 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6296 is its initializer. Generate code to handle the construction
6297 and destruction of DECL. */
6300 expand_static_init (tree decl, tree init)
6302 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6303 gcc_assert (TREE_STATIC (decl));
6305 /* Some variables require no initialization. */
6307 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6308 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6311 if (DECL_FUNCTION_SCOPE_P (decl))
6313 /* Emit code to perform this initialization but once. */
6314 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6315 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6316 tree guard, guard_addr;
6317 tree acquire_fn, release_fn, abort_fn;
6320 /* Emit code to perform this initialization but once. This code
6323 static <type> guard;
6324 if (!guard.first_byte) {
6325 if (__cxa_guard_acquire (&guard)) {
6328 // Do initialization.
6329 flag = true; __cxa_guard_release (&guard);
6330 // Register variable for destruction at end of program.
6332 if (!flag) __cxa_guard_abort (&guard);
6336 Note that the `flag' variable is only set to 1 *after* the
6337 initialization is complete. This ensures that an exception,
6338 thrown during the construction, will cause the variable to
6339 reinitialized when we pass through this code again, as per:
6343 If the initialization exits by throwing an exception, the
6344 initialization is not complete, so it will be tried again
6345 the next time control enters the declaration.
6347 This process should be thread-safe, too; multiple threads
6348 should not be able to initialize the variable more than
6351 /* Create the guard variable. */
6352 guard = get_guard (decl);
6354 /* This optimization isn't safe on targets with relaxed memory
6355 consistency. On such targets we force synchronization in
6356 __cxa_guard_acquire. */
6357 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6359 /* Begin the conditional initialization. */
6360 if_stmt = begin_if_stmt ();
6361 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6362 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6365 if (flag_threadsafe_statics)
6367 guard_addr = build_address (guard);
6369 acquire_fn = get_identifier ("__cxa_guard_acquire");
6370 release_fn = get_identifier ("__cxa_guard_release");
6371 abort_fn = get_identifier ("__cxa_guard_abort");
6372 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6374 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6376 tree vfntype = build_function_type (void_type_node, argtypes);
6377 acquire_fn = push_library_fn
6378 (acquire_fn, build_function_type (integer_type_node, argtypes),
6380 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6381 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6385 release_fn = identifier_global_value (release_fn);
6386 abort_fn = identifier_global_value (abort_fn);
6389 inner_if_stmt = begin_if_stmt ();
6390 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6393 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6394 begin = get_target_expr (boolean_false_node);
6395 flag = TARGET_EXPR_SLOT (begin);
6397 TARGET_EXPR_CLEANUP (begin)
6398 = build3 (COND_EXPR, void_type_node, flag,
6400 build_call_n (abort_fn, 1, guard_addr));
6401 CLEANUP_EH_ONLY (begin) = 1;
6403 /* Do the initialization itself. */
6404 init = add_stmt_to_compound (begin, init);
6405 init = add_stmt_to_compound
6406 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6407 init = add_stmt_to_compound
6408 (init, build_call_n (release_fn, 1, guard_addr));
6411 init = add_stmt_to_compound (init, set_guard (guard));
6413 /* Use atexit to register a function for destroying this static
6415 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6417 finish_expr_stmt (init);
6419 if (flag_threadsafe_statics)
6421 finish_compound_stmt (inner_then_clause);
6422 finish_then_clause (inner_if_stmt);
6423 finish_if_stmt (inner_if_stmt);
6426 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6428 finish_compound_stmt (then_clause);
6429 finish_then_clause (if_stmt);
6430 finish_if_stmt (if_stmt);
6434 static_aggregates = tree_cons (init, decl, static_aggregates);
6438 /* Make TYPE a complete type based on INITIAL_VALUE.
6439 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6440 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6441 3 if the initializer list is empty (in pedantic mode). */
6444 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6447 tree type, elt_type;
6451 unsigned HOST_WIDE_INT i;
6454 /* An array of character type can be initialized from a
6455 brace-enclosed string constant.
6457 FIXME: this code is duplicated from reshape_init. Probably
6458 we should just call reshape_init here? */
6459 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6460 && TREE_CODE (initial_value) == CONSTRUCTOR
6461 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6463 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6464 tree value = VEC_index (constructor_elt, v, 0)->value;
6466 if (TREE_CODE (value) == STRING_CST
6467 && VEC_length (constructor_elt, v) == 1)
6468 initial_value = value;
6471 /* If any of the elements are parameter packs, we can't actually
6472 complete this type now because the array size is dependent. */
6473 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6475 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6478 if (PACK_EXPANSION_P (value))
6484 failure = complete_array_type (ptype, initial_value, do_default);
6486 /* We can create the array before the element type is complete, which
6487 means that we didn't have these two bits set in the original type
6488 either. In completing the type, we are expected to propagate these
6489 bits. See also complete_type which does the same thing for arrays
6492 if (TYPE_DOMAIN (type))
6494 elt_type = TREE_TYPE (type);
6495 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6496 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6497 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6503 /* Return zero if something is declared to be a member of type
6504 CTYPE when in the context of CUR_TYPE. STRING is the error
6505 message to print in that case. Otherwise, quietly return 1. */
6508 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6510 if (ctype && ctype != cur_type)
6512 if (flags == DTOR_FLAG)
6513 error ("destructor for alien class %qT cannot be a member", ctype);
6515 error ("constructor for alien class %qT cannot be a member", ctype);
6521 /* Subroutine of `grokdeclarator'. */
6523 /* Generate errors possibly applicable for a given set of specifiers.
6524 This is for ARM $7.1.2. */
6527 bad_specifiers (tree object,
6536 error ("%qD declared as a %<virtual%> %s", object, type);
6538 error ("%qD declared as an %<inline%> %s", object, type);
6540 error ("%<const%> and %<volatile%> function specifiers on "
6541 "%qD invalid in %s declaration",
6544 error ("%q+D declared as a friend", object);
6546 && (TREE_CODE (object) == TYPE_DECL
6547 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6548 && !TYPE_REFFN_P (TREE_TYPE (object))
6549 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6550 error ("%q+D declared with an exception specification", object);
6553 /* DECL is a member function or static data member and is presently
6554 being defined. Check that the definition is taking place in a
6558 check_class_member_definition_namespace (tree decl)
6560 /* These checks only apply to member functions and static data
6562 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6563 || TREE_CODE (decl) == VAR_DECL);
6564 /* We check for problems with specializations in pt.c in
6565 check_specialization_namespace, where we can issue better
6567 if (processing_specialization)
6569 /* There are no restrictions on the placement of
6570 explicit instantiations. */
6571 if (processing_explicit_instantiation)
6575 A member function definition that appears outside of the
6576 class definition shall appear in a namespace scope enclosing
6577 the class definition.
6581 The definition for a static data member shall appear in a
6582 namespace scope enclosing the member's class definition. */
6583 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6584 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6585 decl, DECL_CONTEXT (decl));
6588 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6589 METHOD_TYPE for a non-static member function; QUALS are the
6590 cv-qualifiers that apply to the function. */
6593 build_this_parm (tree type, cp_cv_quals quals)
6598 cp_cv_quals this_quals;
6600 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6601 /* The `this' parameter is implicitly `const'; it cannot be
6603 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6604 qual_type = cp_build_qualified_type (this_type, this_quals);
6605 parm = build_artificial_parm (this_identifier, qual_type);
6606 cp_apply_type_quals_to_decl (this_quals, parm);
6610 /* CTYPE is class type, or null if non-class.
6611 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6613 DECLARATOR is the function's name.
6614 PARMS is a chain of PARM_DECLs for the function.
6615 VIRTUALP is truthvalue of whether the function is virtual or not.
6616 FLAGS are to be passed through to `grokclassfn'.
6617 QUALS are qualifiers indicating whether the function is `const'
6619 RAISES is a list of exceptions that this function can raise.
6620 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6621 not look, and -1 if we should not call `grokclassfn' at all.
6623 SFK is the kind of special function (if any) for the new function.
6625 Returns `NULL_TREE' if something goes wrong, after issuing
6626 applicable error messages. */
6629 grokfndecl (tree ctype,
6633 tree orig_declarator,
6635 enum overload_flags flags,
6642 special_function_kind sfk,
6647 location_t location)
6650 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6654 type = build_exception_variant (type, raises);
6656 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6658 /* If we have an explicit location, use it, otherwise use whatever
6659 build_lang_decl used (probably input_location). */
6660 if (location != UNKNOWN_LOCATION)
6661 DECL_SOURCE_LOCATION (decl) = location;
6663 if (TREE_CODE (type) == METHOD_TYPE)
6666 parm = build_this_parm (type, quals);
6667 TREE_CHAIN (parm) = parms;
6670 DECL_ARGUMENTS (decl) = parms;
6671 for (t = parms; t; t = TREE_CHAIN (t))
6672 DECL_CONTEXT (t) = decl;
6673 /* Propagate volatile out from type to decl. */
6674 if (TYPE_VOLATILE (type))
6675 TREE_THIS_VOLATILE (decl) = 1;
6677 /* Setup decl according to sfk. */
6680 case sfk_constructor:
6681 case sfk_copy_constructor:
6682 case sfk_move_constructor:
6683 DECL_CONSTRUCTOR_P (decl) = 1;
6685 case sfk_destructor:
6686 DECL_DESTRUCTOR_P (decl) = 1;
6692 /* If pointers to member functions use the least significant bit to
6693 indicate whether a function is virtual, ensure a pointer
6694 to this function will have that bit clear. */
6695 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6696 && TREE_CODE (type) == METHOD_TYPE
6697 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6698 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6701 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6705 ("defining explicit specialization %qD in friend declaration",
6709 tree fns = TREE_OPERAND (orig_declarator, 0);
6710 tree args = TREE_OPERAND (orig_declarator, 1);
6712 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6714 /* Something like `template <class T> friend void f<T>()'. */
6715 error ("invalid use of template-id %qD in declaration "
6716 "of primary template",
6722 /* A friend declaration of the form friend void f<>(). Record
6723 the information in the TEMPLATE_ID_EXPR. */
6724 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6726 if (TREE_CODE (fns) == COMPONENT_REF)
6728 /* Due to bison parser ickiness, we will have already looked
6729 up an operator_name or PFUNCNAME within the current class
6730 (see template_id in parse.y). If the current class contains
6731 such a name, we'll get a COMPONENT_REF here. Undo that. */
6733 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6734 == current_class_type);
6735 fns = TREE_OPERAND (fns, 1);
6737 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6738 || TREE_CODE (fns) == OVERLOAD);
6739 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6741 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6742 if (TREE_PURPOSE (t)
6743 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6745 error ("default arguments are not allowed in declaration "
6746 "of friend template specialization %qD",
6753 error ("%<inline%> is not allowed in declaration of friend "
6754 "template specialization %qD",
6761 /* If this decl has namespace scope, set that up. */
6763 set_decl_namespace (decl, in_namespace, friendp);
6765 DECL_CONTEXT (decl) = FROB_CONTEXT (current_decl_namespace ());
6767 /* `main' and builtins have implicit 'C' linkage. */
6768 if ((MAIN_NAME_P (declarator)
6769 || (IDENTIFIER_LENGTH (declarator) > 10
6770 && IDENTIFIER_POINTER (declarator)[0] == '_'
6771 && IDENTIFIER_POINTER (declarator)[1] == '_'
6772 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6773 && current_lang_name == lang_name_cplusplus
6774 && ctype == NULL_TREE
6775 /* NULL_TREE means global namespace. */
6776 && DECL_CONTEXT (decl) == NULL_TREE)
6777 SET_DECL_LANGUAGE (decl, lang_c);
6779 /* Should probably propagate const out from type to decl I bet (mrs). */
6782 DECL_STATIC_FUNCTION_P (decl) = 1;
6783 DECL_CONTEXT (decl) = ctype;
6788 DECL_CONTEXT (decl) = ctype;
6790 check_class_member_definition_namespace (decl);
6793 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6795 if (processing_template_decl)
6796 error ("cannot declare %<::main%> to be a template");
6798 error ("cannot declare %<::main%> to be inline");
6800 error ("cannot declare %<::main%> to be static");
6805 /* Members of anonymous types and local classes have no linkage; make
6806 them internal. If a typedef is made later, this will be changed. */
6807 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6808 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6811 if (publicp && cxx_dialect == cxx98)
6813 /* [basic.link]: A name with no linkage (notably, the name of a class
6814 or enumeration declared in a local scope) shall not be used to
6815 declare an entity with linkage.
6817 DR 757 relaxes this restriction for C++0x. */
6818 t = no_linkage_check (TREE_TYPE (decl),
6819 /*relaxed_p=*/false);
6822 if (TYPE_ANONYMOUS_P (t))
6824 if (DECL_EXTERN_C_P (decl))
6825 /* Allow this; it's pretty common in C. */;
6828 permerror (input_location, "anonymous type with no linkage "
6829 "used to declare function %q#D with linkage",
6831 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6832 permerror (input_location, "%q+#D does not refer to the unqualified "
6833 "type, so it is not used for linkage",
6838 permerror (input_location, "type %qT with no linkage used to "
6839 "declare function %q#D with linkage", t, decl);
6843 TREE_PUBLIC (decl) = publicp;
6846 DECL_INTERFACE_KNOWN (decl) = 1;
6847 DECL_NOT_REALLY_EXTERN (decl) = 1;
6850 /* If the declaration was declared inline, mark it as such. */
6852 DECL_DECLARED_INLINE_P (decl) = 1;
6854 DECL_EXTERNAL (decl) = 1;
6855 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6858 ? G_("static member function %qD cannot have cv-qualifier")
6859 : G_("non-member function %qD cannot have cv-qualifier"),
6861 quals = TYPE_UNQUALIFIED;
6864 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6865 && !grok_op_properties (decl, /*complain=*/true))
6869 /* Make the init_value nonzero so pushdecl knows this is not
6870 tentative. error_mark_node is replaced later with the BLOCK. */
6871 DECL_INITIAL (decl) = error_mark_node;
6873 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6874 TREE_NOTHROW (decl) = 1;
6876 /* Caller will do the rest of this. */
6880 if (ctype != NULL_TREE)
6881 grokclassfn (ctype, decl, flags);
6883 decl = check_explicit_specialization (orig_declarator, decl,
6886 4 * (friendp != 0));
6887 if (decl == error_mark_node)
6892 cplus_decl_attributes (&decl, *attrlist, 0);
6893 *attrlist = NULL_TREE;
6896 /* Check main's type after attributes have been applied. */
6897 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6899 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6902 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6904 error ("%<::main%> must return %<int%>");
6905 newtype = build_function_type (integer_type_node, oldtypeargs);
6906 TREE_TYPE (decl) = newtype;
6909 check_main_parameter_types (decl);
6912 if (ctype != NULL_TREE
6913 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6916 tree old_decl = check_classfn (ctype, decl,
6917 (processing_template_decl
6918 > template_class_depth (ctype))
6919 ? current_template_parms
6922 if (old_decl == error_mark_node)
6930 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6931 /* Because grokfndecl is always supposed to return a
6932 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6933 here. We depend on our callers to figure out that its
6934 really a template that's being returned. */
6935 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6937 if (DECL_STATIC_FUNCTION_P (old_decl)
6938 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6939 /* Remove the `this' parm added by grokclassfn.
6940 XXX Isn't this done in start_function, too? */
6941 revert_static_member_fn (decl);
6942 if (DECL_ARTIFICIAL (old_decl))
6944 error ("definition of implicitly-declared %qD", old_decl);
6948 /* Since we've smashed OLD_DECL to its
6949 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6950 if (TREE_CODE (decl) == TEMPLATE_DECL)
6951 decl = DECL_TEMPLATE_RESULT (decl);
6953 /* Attempt to merge the declarations. This can fail, in
6954 the case of some invalid specialization declarations. */
6955 pushed_scope = push_scope (ctype);
6956 ok = duplicate_decls (decl, old_decl, friendp);
6958 pop_scope (pushed_scope);
6961 error ("no %q#D member function declared in class %qT",
6969 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6972 if (ctype == NULL_TREE || check)
6976 DECL_VIRTUAL_P (decl) = 1;
6981 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6982 the linkage that DECL will receive in the object file. */
6985 set_linkage_for_static_data_member (tree decl)
6987 /* A static data member always has static storage duration and
6988 external linkage. Note that static data members are forbidden in
6989 local classes -- the only situation in which a class has
6990 non-external linkage. */
6991 TREE_PUBLIC (decl) = 1;
6992 TREE_STATIC (decl) = 1;
6993 /* For non-template classes, static data members are always put
6994 out in exactly those files where they are defined, just as
6995 with ordinary namespace-scope variables. */
6996 if (!processing_template_decl)
6997 DECL_INTERFACE_KNOWN (decl) = 1;
7000 /* Create a VAR_DECL named NAME with the indicated TYPE.
7002 If SCOPE is non-NULL, it is the class type or namespace containing
7003 the variable. If SCOPE is NULL, the variable should is created in
7004 the innermost enclosings scope. */
7007 grokvardecl (tree type,
7009 const cp_decl_specifier_seq *declspecs,
7015 tree explicit_scope;
7017 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7019 /* Compute the scope in which to place the variable, but remember
7020 whether or not that scope was explicitly specified by the user. */
7021 explicit_scope = scope;
7024 /* An explicit "extern" specifier indicates a namespace-scope
7026 if (declspecs->storage_class == sc_extern)
7027 scope = current_decl_namespace ();
7028 else if (!at_function_scope_p ())
7029 scope = current_scope ();
7033 && (/* If the variable is a namespace-scope variable declared in a
7034 template, we need DECL_LANG_SPECIFIC. */
7035 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7036 /* Similarly for namespace-scope variables with language linkage
7038 || (TREE_CODE (scope) == NAMESPACE_DECL
7039 && current_lang_name != lang_name_cplusplus)
7040 /* Similarly for static data members. */
7042 decl = build_lang_decl (VAR_DECL, name, type);
7044 decl = build_decl (input_location, VAR_DECL, name, type);
7046 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7047 set_decl_namespace (decl, explicit_scope, 0);
7049 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7051 if (declspecs->storage_class == sc_extern)
7053 DECL_THIS_EXTERN (decl) = 1;
7054 DECL_EXTERNAL (decl) = !initialized;
7057 if (DECL_CLASS_SCOPE_P (decl))
7059 set_linkage_for_static_data_member (decl);
7060 /* This function is only called with out-of-class definitions. */
7061 DECL_EXTERNAL (decl) = 0;
7062 check_class_member_definition_namespace (decl);
7064 /* At top level, either `static' or no s.c. makes a definition
7065 (perhaps tentative), and absence of `static' makes it public. */
7066 else if (toplevel_bindings_p ())
7068 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7069 && (DECL_THIS_EXTERN (decl) || ! constp));
7070 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7072 /* Not at top level, only `static' makes a static definition. */
7075 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7076 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7079 if (declspecs->specs[(int)ds_thread])
7080 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7082 /* If the type of the decl has no linkage, make sure that we'll
7083 notice that in mark_used. */
7084 if (cxx_dialect > cxx98
7085 && decl_linkage (decl) != lk_none
7086 && DECL_LANG_SPECIFIC (decl) == NULL
7087 && !DECL_EXTERN_C_P (decl)
7088 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7089 retrofit_lang_decl (decl);
7091 if (TREE_PUBLIC (decl))
7093 /* [basic.link]: A name with no linkage (notably, the name of a class
7094 or enumeration declared in a local scope) shall not be used to
7095 declare an entity with linkage.
7097 DR 757 relaxes this restriction for C++0x. */
7098 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7099 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7102 if (TYPE_ANONYMOUS_P (t))
7104 if (DECL_EXTERN_C_P (decl))
7105 /* Allow this; it's pretty common in C. */
7109 /* DRs 132, 319 and 389 seem to indicate types with
7110 no linkage can only be used to declare extern "C"
7111 entities. Since it's not always an error in the
7112 ISO C++ 90 Standard, we only issue a warning. */
7113 warning (0, "anonymous type with no linkage used to declare "
7114 "variable %q#D with linkage", decl);
7115 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7116 warning (0, "%q+#D does not refer to the unqualified "
7117 "type, so it is not used for linkage",
7122 warning (0, "type %qT with no linkage used to declare variable "
7123 "%q#D with linkage", t, decl);
7127 DECL_INTERFACE_KNOWN (decl) = 1;
7132 /* Create and return a canonical pointer to member function type, for
7133 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7136 build_ptrmemfunc_type (tree type)
7140 tree unqualified_variant = NULL_TREE;
7142 if (type == error_mark_node)
7145 /* If a canonical type already exists for this type, use it. We use
7146 this method instead of type_hash_canon, because it only does a
7147 simple equality check on the list of field members. */
7149 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7152 /* Make sure that we always have the unqualified pointer-to-member
7154 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7156 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7158 t = make_class_type (RECORD_TYPE);
7159 xref_basetypes (t, NULL_TREE);
7161 /* Let the front end know this is a pointer to member function... */
7162 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7163 /* ... and not really a class type. */
7164 SET_CLASS_TYPE_P (t, 0);
7166 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7169 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7171 TREE_CHAIN (field) = fields;
7174 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7176 /* Zap out the name so that the back end will give us the debugging
7177 information for this anonymous RECORD_TYPE. */
7178 TYPE_NAME (t) = NULL_TREE;
7180 /* If this is not the unqualified form of this pointer-to-member
7181 type, set the TYPE_MAIN_VARIANT for this type to be the
7182 unqualified type. Since they are actually RECORD_TYPEs that are
7183 not variants of each other, we must do this manually.
7184 As we just built a new type there is no need to do yet another copy. */
7185 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7187 int type_quals = cp_type_quals (type);
7188 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7189 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7190 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7191 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7192 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7193 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7194 TREE_TYPE (TYPE_BINFO (t)) = t;
7197 /* Cache this pointer-to-member type so that we can find it again
7199 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7201 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7202 SET_TYPE_STRUCTURAL_EQUALITY (t);
7203 else if (TYPE_CANONICAL (type) != type)
7204 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7209 /* Create and return a pointer to data member type. */
7212 build_ptrmem_type (tree class_type, tree member_type)
7214 if (TREE_CODE (member_type) == METHOD_TYPE)
7216 tree arg_types = TYPE_ARG_TYPES (member_type);
7217 cp_cv_quals quals = cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)));
7218 member_type = build_memfn_type (member_type, class_type, quals);
7219 return build_ptrmemfunc_type (build_pointer_type (member_type));
7223 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7224 return build_offset_type (class_type, member_type);
7228 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7229 Check to see that the definition is valid. Issue appropriate error
7230 messages. Return 1 if the definition is particularly bad, or 0
7234 check_static_variable_definition (tree decl, tree type)
7236 /* Motion 10 at San Diego: If a static const integral data member is
7237 initialized with an integral constant expression, the initializer
7238 may appear either in the declaration (within the class), or in
7239 the definition, but not both. If it appears in the class, the
7240 member is a member constant. The file-scope definition is always
7242 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7244 error ("invalid in-class initialization of static data member "
7245 "of non-integral type %qT",
7247 /* If we just return the declaration, crashes will sometimes
7248 occur. We therefore return void_type_node, as if this were a
7249 friend declaration, to cause callers to completely ignore
7250 this declaration. */
7253 else if (!CP_TYPE_CONST_P (type))
7254 error ("ISO C++ forbids in-class initialization of non-const "
7255 "static member %qD",
7257 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7258 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7259 "%qD of non-integral type %qT", decl, type);
7264 /* Given the SIZE (i.e., number of elements) in an array, compute an
7265 appropriate index type for the array. If non-NULL, NAME is the
7266 name of the thing being declared. */
7269 compute_array_index_type (tree name, tree size)
7273 tree abi_1_itype = NULL_TREE;
7275 if (error_operand_p (size))
7276 return error_mark_node;
7278 type = TREE_TYPE (size);
7279 /* The array bound must be an integer type. */
7280 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7283 error ("size of array %qD has non-integral type %qT", name, type);
7285 error ("size of array has non-integral type %qT", type);
7286 size = integer_one_node;
7287 type = TREE_TYPE (size);
7290 /* We can only call value_dependent_expression_p on integral constant
7291 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7292 set if this isn't one. */
7293 if (processing_template_decl
7294 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7296 /* We cannot do any checking for a SIZE that isn't known to be
7297 constant. Just build the index type and mark that it requires
7298 structural equality checks. */
7299 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7300 size, integer_one_node));
7301 TYPE_DEPENDENT_P (itype) = 1;
7302 TYPE_DEPENDENT_P_VALID (itype) = 1;
7303 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7307 if (!abi_version_at_least (2) && processing_template_decl)
7308 /* For abi-1, we handled all instances in templates the same way,
7309 even when they were non-dependent. This affects the manglings
7310 produced. So, we do the normal checking for non-dependent
7311 sizes, but at the end we'll return the same type that abi-1
7312 would have, but with TYPE_CANONICAL set to the "right"
7313 value that the current ABI would provide. */
7314 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7315 size, integer_one_node));
7317 /* The size might be the result of a cast. */
7318 STRIP_TYPE_NOPS (size);
7320 /* It might be a const variable or enumeration constant. */
7321 size = integral_constant_value (size);
7322 if (error_operand_p (size))
7323 return error_mark_node;
7325 /* Normally, the array-bound will be a constant. */
7326 if (TREE_CODE (size) == INTEGER_CST)
7328 /* Check to see if the array bound overflowed. Make that an
7329 error, no matter how generous we're being. */
7330 constant_expression_error (size);
7332 /* An array must have a positive number of elements. */
7333 if (INT_CST_LT (size, integer_zero_node))
7336 error ("size of array %qD is negative", name);
7338 error ("size of array is negative");
7339 size = integer_one_node;
7341 /* As an extension we allow zero-sized arrays. We always allow
7342 them in system headers because glibc uses them. */
7343 else if (integer_zerop (size) && !in_system_header)
7346 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7348 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7351 else if (TREE_CONSTANT (size))
7353 /* `(int) &fn' is not a valid array bound. */
7355 error ("size of array %qD is not an integral constant-expression",
7358 error ("size of array is not an integral constant-expression");
7359 size = integer_one_node;
7361 else if (pedantic && warn_vla != 0)
7364 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7366 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7368 else if (warn_vla > 0)
7372 "variable length array %qD is used", name);
7375 "variable length array is used");
7378 if (processing_template_decl && !TREE_CONSTANT (size))
7379 /* A variable sized array. */
7380 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7383 HOST_WIDE_INT saved_processing_template_decl;
7385 /* Compute the index of the largest element in the array. It is
7386 one less than the number of elements in the array. We save
7387 and restore PROCESSING_TEMPLATE_DECL so that computations in
7388 cp_build_binary_op will be appropriately folded. */
7389 saved_processing_template_decl = processing_template_decl;
7390 processing_template_decl = 0;
7391 itype = cp_build_binary_op (input_location,
7393 cp_convert (ssizetype, size),
7394 cp_convert (ssizetype, integer_one_node),
7395 tf_warning_or_error);
7396 itype = fold (itype);
7397 processing_template_decl = saved_processing_template_decl;
7399 if (!TREE_CONSTANT (itype))
7400 /* A variable sized array. */
7401 itype = variable_size (itype);
7402 /* Make sure that there was no overflow when creating to a signed
7403 index type. (For example, on a 32-bit machine, an array with
7404 size 2^32 - 1 is too big.) */
7405 else if (TREE_CODE (itype) == INTEGER_CST
7406 && TREE_OVERFLOW (itype))
7408 error ("overflow in array dimension");
7409 TREE_OVERFLOW (itype) = 0;
7413 /* Create and return the appropriate index type. */
7416 tree t = build_index_type (itype);
7417 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7421 return build_index_type (itype);
7424 /* Returns the scope (if any) in which the entity declared by
7425 DECLARATOR will be located. If the entity was declared with an
7426 unqualified name, NULL_TREE is returned. */
7429 get_scope_of_declarator (const cp_declarator *declarator)
7431 while (declarator && declarator->kind != cdk_id)
7432 declarator = declarator->declarator;
7434 /* If the declarator-id is a SCOPE_REF, the scope in which the
7435 declaration occurs is the first operand. */
7437 && declarator->u.id.qualifying_scope)
7438 return declarator->u.id.qualifying_scope;
7440 /* Otherwise, the declarator is not a qualified name; the entity will
7441 be declared in the current scope. */
7445 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7446 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7450 create_array_type_for_decl (tree name, tree type, tree size)
7452 tree itype = NULL_TREE;
7454 /* If things have already gone awry, bail now. */
7455 if (type == error_mark_node || size == error_mark_node)
7456 return error_mark_node;
7458 /* If there are some types which cannot be array elements,
7459 issue an error-message and return. */
7460 switch (TREE_CODE (type))
7464 error ("declaration of %qD as array of void", name);
7466 error ("creating array of void");
7467 return error_mark_node;
7471 error ("declaration of %qD as array of functions", name);
7473 error ("creating array of functions");
7474 return error_mark_node;
7476 case REFERENCE_TYPE:
7478 error ("declaration of %qD as array of references", name);
7480 error ("creating array of references");
7481 return error_mark_node;
7485 error ("declaration of %qD as array of function members", name);
7487 error ("creating array of function members");
7488 return error_mark_node;
7496 The constant expressions that specify the bounds of the arrays
7497 can be omitted only for the first member of the sequence. */
7498 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7501 error ("declaration of %qD as multidimensional array must "
7502 "have bounds for all dimensions except the first",
7505 error ("multidimensional array must have bounds for all "
7506 "dimensions except the first");
7508 return error_mark_node;
7511 /* Figure out the index type for the array. */
7513 itype = compute_array_index_type (name, size);
7516 T is called the array element type; this type shall not be [...] an
7517 abstract class type. */
7518 abstract_virtuals_error (name, type);
7520 return build_cplus_array_type (type, itype);
7523 /* Check that it's OK to declare a function with the indicated TYPE.
7524 SFK indicates the kind of special function (if any) that this
7525 function is. OPTYPE is the type given in a conversion operator
7526 declaration, or the class type for a constructor/destructor.
7527 Returns the actual return type of the function; that
7528 may be different than TYPE if an error occurs, or for certain
7529 special functions. */
7532 check_special_function_return_type (special_function_kind sfk,
7538 case sfk_constructor:
7540 error ("return type specification for constructor invalid");
7542 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7543 type = build_pointer_type (optype);
7545 type = void_type_node;
7548 case sfk_destructor:
7550 error ("return type specification for destructor invalid");
7551 /* We can't use the proper return type here because we run into
7552 problems with ambiguous bases and covariant returns.
7553 Java classes are left unchanged because (void *) isn't a valid
7554 Java type, and we don't want to change the Java ABI. */
7555 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7556 type = build_pointer_type (void_type_node);
7558 type = void_type_node;
7561 case sfk_conversion:
7563 error ("return type specified for %<operator %T%>", optype);
7574 /* A variable or data member (whose unqualified name is IDENTIFIER)
7575 has been declared with the indicated TYPE. If the TYPE is not
7576 acceptable, issue an error message and return a type to use for
7577 error-recovery purposes. */
7580 check_var_type (tree identifier, tree type)
7582 if (VOID_TYPE_P (type))
7585 error ("unnamed variable or field declared void");
7586 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7588 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7589 error ("variable or field %qE declared void", identifier);
7592 error ("variable or field declared void");
7593 type = error_mark_node;
7599 /* Given declspecs and a declarator (abstract or otherwise), determine
7600 the name and type of the object declared and construct a DECL node
7603 DECLSPECS points to the representation of declaration-specifier
7604 sequence that precedes declarator.
7606 DECL_CONTEXT says which syntactic context this declaration is in:
7607 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7608 FUNCDEF for a function definition. Like NORMAL but a few different
7609 error messages in each case. Return value may be zero meaning
7610 this definition is too screwy to try to parse.
7611 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7612 handle member functions (which have FIELD context).
7613 Return value may be zero meaning this definition is too screwy to
7615 PARM for a parameter declaration (either within a function prototype
7616 or before a function body). Make a PARM_DECL, or return void_type_node.
7617 TPARM for a template parameter declaration.
7618 CATCHPARM for a parameter declaration before a catch clause.
7619 TYPENAME if for a typename (in a cast or sizeof).
7620 Don't make a DECL node; just return the ..._TYPE node.
7621 FIELD for a struct or union field; make a FIELD_DECL.
7622 BITFIELD for a field with specified width.
7624 INITIALIZED is as for start_decl.
7626 ATTRLIST is a pointer to the list of attributes, which may be NULL
7627 if there are none; *ATTRLIST may be modified if attributes from inside
7628 the declarator should be applied to the declaration.
7630 When this function is called, scoping variables (such as
7631 CURRENT_CLASS_TYPE) should reflect the scope in which the
7632 declaration occurs, not the scope in which the new declaration will
7633 be placed. For example, on:
7637 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7640 Returns a DECL (if a declarator is present), a TYPE (if there is no
7641 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7645 grokdeclarator (const cp_declarator *declarator,
7646 const cp_decl_specifier_seq *declspecs,
7647 enum decl_context decl_context,
7651 tree type = NULL_TREE;
7653 int virtualp, explicitp, friendp, inlinep, staticp;
7654 int explicit_int = 0;
7655 int explicit_char = 0;
7656 int defaulted_int = 0;
7657 tree dependent_name = NULL_TREE;
7659 tree typedef_decl = NULL_TREE;
7660 const char *name = NULL;
7661 tree typedef_type = NULL_TREE;
7662 /* True if this declarator is a function definition. */
7663 bool funcdef_flag = false;
7664 cp_declarator_kind innermost_code = cdk_error;
7667 /* See the code below that used this. */
7668 tree decl_attr = NULL_TREE;
7671 /* Keep track of what sort of function is being processed
7672 so that we can warn about default return values, or explicit
7673 return values which do not match prescribed defaults. */
7674 special_function_kind sfk = sfk_none;
7676 tree dname = NULL_TREE;
7677 tree ctor_return_type = NULL_TREE;
7678 enum overload_flags flags = NO_SPECIAL;
7679 /* cv-qualifiers that apply to the declarator, for a declaration of
7680 a member function. */
7681 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7682 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7684 tree raises = NULL_TREE;
7685 int template_count = 0;
7686 tree returned_attrs = NULL_TREE;
7687 tree parms = NULL_TREE;
7688 const cp_declarator *id_declarator;
7689 /* The unqualified name of the declarator; either an
7690 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7691 tree unqualified_id;
7692 /* The class type, if any, in which this entity is located,
7693 or NULL_TREE if none. Note that this value may be different from
7694 the current class type; for example if an attempt is made to declare
7695 "A::f" inside "B", this value will be "A". */
7696 tree ctype = current_class_type;
7697 /* The NAMESPACE_DECL for the namespace in which this entity is
7698 located. If an unqualified name is used to declare the entity,
7699 this value will be NULL_TREE, even if the entity is located at
7701 tree in_namespace = NULL_TREE;
7702 cp_storage_class storage_class;
7703 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7704 bool type_was_error_mark_node = false;
7705 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7706 bool template_type_arg = false;
7707 bool template_parm_flag = false;
7708 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7711 signed_p = declspecs->specs[(int)ds_signed];
7712 unsigned_p = declspecs->specs[(int)ds_unsigned];
7713 short_p = declspecs->specs[(int)ds_short];
7714 long_p = declspecs->specs[(int)ds_long];
7715 longlong = declspecs->specs[(int)ds_long] >= 2;
7716 thread_p = declspecs->specs[(int)ds_thread];
7718 if (decl_context == FUNCDEF)
7719 funcdef_flag = true, decl_context = NORMAL;
7720 else if (decl_context == MEMFUNCDEF)
7721 funcdef_flag = true, decl_context = FIELD;
7722 else if (decl_context == BITFIELD)
7723 bitfield = 1, decl_context = FIELD;
7724 else if (decl_context == TEMPLATE_TYPE_ARG)
7725 template_type_arg = true, decl_context = TYPENAME;
7726 else if (decl_context == TPARM)
7727 template_parm_flag = true, decl_context = PARM;
7729 if (initialized > 1)
7730 funcdef_flag = true;
7732 /* Look inside a declarator for the name being declared
7733 and get it as a string, for an error message. */
7734 for (id_declarator = declarator;
7736 id_declarator = id_declarator->declarator)
7738 if (id_declarator->kind != cdk_id)
7739 innermost_code = id_declarator->kind;
7741 switch (id_declarator->kind)
7744 if (id_declarator->declarator
7745 && id_declarator->declarator->kind == cdk_id)
7747 sfk = id_declarator->declarator->u.id.sfk;
7748 if (sfk == sfk_destructor)
7755 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7756 tree decl = id_declarator->u.id.unqualified_name;
7759 if (qualifying_scope)
7761 if (at_function_scope_p ())
7765 A declarator-id shall not be qualified except
7768 None of the cases are permitted in block
7770 if (qualifying_scope == global_namespace)
7771 error ("invalid use of qualified-name %<::%D%>",
7773 else if (TYPE_P (qualifying_scope))
7774 error ("invalid use of qualified-name %<%T::%D%>",
7775 qualifying_scope, decl);
7777 error ("invalid use of qualified-name %<%D::%D%>",
7778 qualifying_scope, decl);
7779 return error_mark_node;
7781 else if (TYPE_P (qualifying_scope))
7783 ctype = qualifying_scope;
7784 if (innermost_code != cdk_function
7785 && current_class_type
7786 && !UNIQUELY_DERIVED_FROM_P (ctype,
7787 current_class_type))
7789 error ("type %qT is not derived from type %qT",
7790 ctype, current_class_type);
7791 return error_mark_node;
7794 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7795 in_namespace = qualifying_scope;
7797 switch (TREE_CODE (decl))
7803 if (innermost_code != cdk_function)
7805 error ("declaration of %qD as non-function", decl);
7806 return error_mark_node;
7808 else if (!qualifying_scope
7809 && !(current_class_type && at_class_scope_p ()))
7811 error ("declaration of %qD as non-member", decl);
7812 return error_mark_node;
7815 type = TREE_OPERAND (decl, 0);
7817 type = constructor_name (type);
7818 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7823 case TEMPLATE_ID_EXPR:
7825 tree fns = TREE_OPERAND (decl, 0);
7828 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7830 gcc_assert (is_overloaded_fn (dname));
7831 dname = DECL_NAME (get_first_fn (dname));
7836 case IDENTIFIER_NODE:
7837 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7840 if (C_IS_RESERVED_WORD (dname))
7842 error ("declarator-id missing; using reserved word %qD",
7844 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7846 else if (!IDENTIFIER_TYPENAME_P (dname))
7847 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7850 gcc_assert (flags == NO_SPECIAL);
7851 flags = TYPENAME_FLAG;
7852 ctor_return_type = TREE_TYPE (dname);
7853 sfk = sfk_conversion;
7854 if (is_typename_at_global_scope (dname))
7855 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7857 name = "<invalid operator>";
7874 return error_mark_node;
7879 if (id_declarator->kind == cdk_id)
7885 The declarator in a function-definition shall have the form
7886 D1 ( parameter-declaration-clause) ... */
7887 if (funcdef_flag && innermost_code != cdk_function)
7889 error ("function definition does not declare parameters");
7890 return error_mark_node;
7893 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7894 && innermost_code != cdk_function
7895 && ! (ctype && !declspecs->any_specifiers_p))
7897 error ("declaration of %qD as non-function", dname);
7898 return error_mark_node;
7901 /* Anything declared one level down from the top level
7902 must be one of the parameters of a function
7903 (because the body is at least two levels down). */
7905 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7906 by not allowing C++ class definitions to specify their parameters
7907 with xdecls (must be spec.d in the parmlist).
7909 Since we now wait to push a class scope until we are sure that
7910 we are in a legitimate method context, we must set oldcname
7911 explicitly (since current_class_name is not yet alive).
7913 We also want to avoid calling this a PARM if it is in a namespace. */
7915 if (decl_context == NORMAL && !toplevel_bindings_p ())
7917 struct cp_binding_level *b = current_binding_level;
7918 current_binding_level = b->level_chain;
7919 if (current_binding_level != 0 && toplevel_bindings_p ())
7920 decl_context = PARM;
7921 current_binding_level = b;
7925 name = decl_context == PARM ? "parameter" : "type name";
7927 /* If there were multiple types specified in the decl-specifier-seq,
7928 issue an error message. */
7929 if (declspecs->multiple_types_p)
7931 error ("two or more data types in declaration of %qs", name);
7932 return error_mark_node;
7935 if (declspecs->conflicting_specifiers_p)
7937 error ("conflicting specifiers in declaration of %qs", name);
7938 return error_mark_node;
7941 /* Extract the basic type from the decl-specifier-seq. */
7942 type = declspecs->type;
7943 if (type == error_mark_node)
7946 type_was_error_mark_node = true;
7948 /* If the entire declaration is itself tagged as deprecated then
7949 suppress reports of deprecated items. */
7950 if (type && TREE_DEPRECATED (type)
7951 && deprecated_state != DEPRECATED_SUPPRESS)
7952 warn_deprecated_use (type, NULL_TREE);
7953 if (type && TREE_CODE (type) == TYPE_DECL)
7955 typedef_decl = type;
7956 type = TREE_TYPE (typedef_decl);
7957 if (TREE_DEPRECATED (type)
7958 && DECL_ARTIFICIAL (typedef_decl)
7959 && deprecated_state != DEPRECATED_SUPPRESS)
7960 warn_deprecated_use (type, NULL_TREE);
7962 /* No type at all: default to `int', and set DEFAULTED_INT
7963 because it was not a user-defined typedef. */
7964 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7966 /* These imply 'int'. */
7967 type = integer_type_node;
7971 explicit_int = declspecs->explicit_int_p;
7972 explicit_char = declspecs->explicit_char_p;
7975 /* See the code below that used this. */
7977 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7979 typedef_type = type;
7982 if (sfk != sfk_conversion)
7983 ctor_return_type = ctype;
7985 if (sfk != sfk_none)
7986 type = check_special_function_return_type (sfk, type,
7988 else if (type == NULL_TREE)
7994 /* We handle `main' specially here, because 'main () { }' is so
7995 common. With no options, it is allowed. With -Wreturn-type,
7996 it is a warning. It is only an error with -pedantic-errors. */
7997 is_main = (funcdef_flag
7998 && dname && MAIN_NAME_P (dname)
7999 && ctype == NULL_TREE
8000 && in_namespace == NULL_TREE
8001 && current_namespace == global_namespace);
8003 if (type_was_error_mark_node)
8004 /* We've already issued an error, don't complain more. */;
8005 else if (in_system_header || flag_ms_extensions)
8006 /* Allow it, sigh. */;
8008 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
8010 pedwarn (input_location, OPT_pedantic,
8011 "ISO C++ forbids declaration of %qs with no type", name);
8013 warning (OPT_Wreturn_type,
8014 "ISO C++ forbids declaration of %qs with no type", name);
8016 type = integer_type_node;
8021 /* Now process the modifiers that were specified
8022 and check for invalid combinations. */
8024 /* Long double is a special combination. */
8025 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8028 type = build_qualified_type (long_double_type_node,
8029 cp_type_quals (type));
8032 /* Check all other uses of type modifiers. */
8034 if (unsigned_p || signed_p || long_p || short_p)
8038 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8039 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8040 else if (signed_p && unsigned_p)
8041 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8042 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8043 error ("%<long long%> invalid for %qs", name);
8044 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8045 error ("%<long%> invalid for %qs", name);
8046 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8047 error ("%<short%> invalid for %qs", name);
8048 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8049 error ("%<long%> or %<short%> invalid for %qs", name);
8050 else if ((long_p || short_p) && explicit_char)
8051 error ("%<long%> or %<short%> specified with char for %qs", name);
8052 else if (long_p && short_p)
8053 error ("%<long%> and %<short%> specified together for %qs", name);
8054 else if (type == char16_type_node || type == char32_type_node)
8056 if (signed_p || unsigned_p)
8057 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8058 else if (short_p || long_p)
8059 error ("%<short%> or %<long%> invalid for %qs", name);
8064 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
8066 pedwarn (input_location, OPT_pedantic,
8067 "long, short, signed or unsigned used invalidly for %qs",
8069 if (flag_pedantic_errors)
8074 /* Discard the type modifiers if they are invalid. */
8085 /* Decide whether an integer type is signed or not.
8086 Optionally treat bitfields as signed by default. */
8090 It is implementation-defined whether a plain (neither
8091 explicitly signed or unsigned) char, short, int, or long
8092 bit-field is signed or unsigned.
8094 Naturally, we extend this to long long as well. Note that
8095 this does not include wchar_t. */
8096 || (bitfield && !flag_signed_bitfields
8098 /* A typedef for plain `int' without `signed' can be
8099 controlled just like plain `int', but a typedef for
8100 `signed int' cannot be so controlled. */
8102 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8103 && TREE_CODE (type) == INTEGER_TYPE
8104 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8107 type = long_long_unsigned_type_node;
8109 type = long_unsigned_type_node;
8111 type = short_unsigned_type_node;
8112 else if (type == char_type_node)
8113 type = unsigned_char_type_node;
8114 else if (typedef_decl)
8115 type = unsigned_type_for (type);
8117 type = unsigned_type_node;
8119 else if (signed_p && type == char_type_node)
8120 type = signed_char_type_node;
8122 type = long_long_integer_type_node;
8124 type = long_integer_type_node;
8126 type = short_integer_type_node;
8128 if (declspecs->specs[(int)ds_complex])
8130 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8131 error ("complex invalid for %qs", name);
8132 /* If we just have "complex", it is equivalent to
8133 "complex double", but if any modifiers at all are specified it is
8134 the complex form of TYPE. E.g, "complex short" is
8135 "complex short int". */
8137 else if (defaulted_int && ! longlong
8138 && ! (long_p || short_p || signed_p || unsigned_p))
8139 type = complex_double_type_node;
8140 else if (type == integer_type_node)
8141 type = complex_integer_type_node;
8142 else if (type == float_type_node)
8143 type = complex_float_type_node;
8144 else if (type == double_type_node)
8145 type = complex_double_type_node;
8146 else if (type == long_double_type_node)
8147 type = complex_long_double_type_node;
8149 type = build_complex_type (type);
8152 type_quals = TYPE_UNQUALIFIED;
8153 if (declspecs->specs[(int)ds_const])
8154 type_quals |= TYPE_QUAL_CONST;
8155 /* A `constexpr' specifier used in an object declaration declares
8156 the object as `const'. */
8159 if (innermost_code == cdk_function)
8161 else if (declspecs->specs[(int)ds_const] != 0)
8162 error ("both %<const%> and %<constexpr%> cannot be used here");
8164 type_quals |= TYPE_QUAL_CONST;
8166 if (declspecs->specs[(int)ds_volatile])
8167 type_quals |= TYPE_QUAL_VOLATILE;
8168 if (declspecs->specs[(int)ds_restrict])
8169 type_quals |= TYPE_QUAL_RESTRICT;
8170 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8171 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8174 if (TREE_CODE (type) == FUNCTION_TYPE
8175 && type_quals != TYPE_UNQUALIFIED)
8177 /* This was an error in C++98 (cv-qualifiers cannot be added to
8178 a function type), but DR 295 makes the code well-formed by
8179 dropping the extra qualifiers. */
8180 if (pedantic && cxx_dialect == cxx98)
8182 tree bad_type = build_qualified_type (type, type_quals);
8183 pedwarn (input_location, OPT_pedantic,
8184 "ignoring %qV qualifiers added to function type %qT",
8187 type_quals = TYPE_UNQUALIFIED;
8189 type_quals |= cp_type_quals (type);
8190 type = cp_build_qualified_type_real
8191 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8192 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8193 /* We might have ignored or rejected some of the qualifiers. */
8194 type_quals = cp_type_quals (type);
8197 inlinep = !! declspecs->specs[(int)ds_inline];
8198 virtualp = !! declspecs->specs[(int)ds_virtual];
8199 explicitp = !! declspecs->specs[(int)ds_explicit];
8201 storage_class = declspecs->storage_class;
8202 if (storage_class == sc_static)
8203 staticp = 1 + (decl_context == FIELD);
8205 if (virtualp && staticp == 2)
8207 error ("member %qD cannot be declared both virtual and static", dname);
8208 storage_class = sc_none;
8211 friendp = !! declspecs->specs[(int)ds_friend];
8213 if (dependent_name && !friendp)
8215 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8216 return error_mark_node;
8219 /* Issue errors about use of storage classes for parameters. */
8220 if (decl_context == PARM)
8222 if (declspecs->specs[(int)ds_typedef])
8224 error ("typedef declaration invalid in parameter declaration");
8225 return error_mark_node;
8227 else if (template_parm_flag && storage_class != sc_none)
8229 error ("storage class specified for template parameter %qs", name);
8230 return error_mark_node;
8232 else if (storage_class == sc_static
8233 || storage_class == sc_extern
8235 error ("storage class specifiers invalid in parameter declarations");
8237 if (type_uses_auto (type))
8239 error ("parameter declared %<auto%>");
8240 type = error_mark_node;
8243 /* Function parameters cannot be constexpr. If we saw one, moan
8244 and pretend it wasn't there. */
8247 error ("a parameter cannot be declared %<constexpr%>");
8252 /* Give error if `virtual' is used outside of class declaration. */
8254 && (current_class_name == NULL_TREE || decl_context != FIELD))
8256 error ("%<virtual%> outside class declaration");
8260 /* Static anonymous unions are dealt with here. */
8261 if (staticp && decl_context == TYPENAME
8263 && ANON_AGGR_TYPE_P (declspecs->type))
8264 decl_context = FIELD;
8266 /* Warn about storage classes that are invalid for certain
8267 kinds of declarations (parameters, typenames, etc.). */
8270 && storage_class != sc_extern
8271 && storage_class != sc_static)
8272 || declspecs->specs[(int)ds_typedef]))
8274 error ("multiple storage classes in declaration of %qs", name);
8277 if (decl_context != NORMAL
8278 && ((storage_class != sc_none
8279 && storage_class != sc_mutable)
8282 if ((decl_context == PARM || decl_context == CATCHPARM)
8283 && (storage_class == sc_register
8284 || storage_class == sc_auto))
8286 else if (declspecs->specs[(int)ds_typedef])
8288 else if (decl_context == FIELD
8289 /* C++ allows static class elements. */
8290 && storage_class == sc_static)
8291 /* C++ also allows inlines and signed and unsigned elements,
8292 but in those cases we don't come in here. */
8296 if (decl_context == FIELD)
8297 error ("storage class specified for %qs", name);
8300 if (decl_context == PARM || decl_context == CATCHPARM)
8301 error ("storage class specified for parameter %qs", name);
8303 error ("storage class specified for typename");
8305 if (storage_class == sc_register
8306 || storage_class == sc_auto
8307 || storage_class == sc_extern
8309 storage_class = sc_none;
8312 else if (storage_class == sc_extern && funcdef_flag
8313 && ! toplevel_bindings_p ())
8314 error ("nested function %qs declared %<extern%>", name);
8315 else if (toplevel_bindings_p ())
8317 if (storage_class == sc_auto)
8318 error ("top-level declaration of %qs specifies %<auto%>", name);
8321 && storage_class != sc_extern
8322 && storage_class != sc_static)
8324 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8329 if (storage_class && friendp)
8331 error ("storage class specifiers invalid in friend function declarations");
8332 storage_class = sc_none;
8337 unqualified_id = NULL_TREE;
8340 unqualified_id = id_declarator->u.id.unqualified_name;
8341 switch (TREE_CODE (unqualified_id))
8344 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8345 if (TYPE_P (unqualified_id))
8346 unqualified_id = constructor_name (unqualified_id);
8349 case IDENTIFIER_NODE:
8350 case TEMPLATE_ID_EXPR:
8358 /* Determine the type of the entity declared by recurring on the
8360 for (; declarator; declarator = declarator->declarator)
8362 const cp_declarator *inner_declarator;
8365 if (type == error_mark_node)
8366 return error_mark_node;
8368 attrs = declarator->attributes;
8374 if (declarator == NULL || declarator->kind == cdk_id)
8375 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8376 if (declarator->kind == cdk_function)
8377 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8378 if (declarator->kind == cdk_array)
8379 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8380 returned_attrs = decl_attributes (&type,
8381 chainon (returned_attrs, attrs),
8385 if (declarator->kind == cdk_id)
8388 inner_declarator = declarator->declarator;
8390 switch (declarator->kind)
8393 type = create_array_type_for_decl (dname, type,
8394 declarator->u.array.bounds);
8402 /* Declaring a function type.
8403 Make sure we have a valid type for the function to return. */
8405 if (type_quals != TYPE_UNQUALIFIED)
8407 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8408 warning (OPT_Wignored_qualifiers,
8409 "type qualifiers ignored on function return type");
8410 /* We now know that the TYPE_QUALS don't apply to the
8411 decl, but to its return type. */
8412 type_quals = TYPE_UNQUALIFIED;
8414 errmsg = targetm.invalid_return_type (type);
8418 type = integer_type_node;
8421 /* Error about some types functions can't return. */
8423 if (TREE_CODE (type) == FUNCTION_TYPE)
8425 error ("%qs declared as function returning a function", name);
8426 return error_mark_node;
8428 if (TREE_CODE (type) == ARRAY_TYPE)
8430 error ("%qs declared as function returning an array", name);
8431 return error_mark_node;
8434 /* Pick up type qualifiers which should be applied to `this'. */
8435 memfn_quals = declarator->u.function.qualifiers;
8437 /* Pick up the exception specifications. */
8438 raises = declarator->u.function.exception_specification;
8440 /* Say it's a definition only for the CALL_EXPR
8441 closest to the identifier. */
8442 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8444 /* Handle a late-specified return type. */
8447 if (type_uses_auto (type))
8449 if (!declarator->u.function.late_return_type)
8451 error ("%qs function uses %<auto%> type specifier without"
8452 " late return type", name);
8453 return error_mark_node;
8455 else if (!is_auto (type))
8457 error ("%qs function with late return type has"
8458 " %qT as its type rather than plain %<auto%>",
8460 return error_mark_node;
8463 else if (declarator->u.function.late_return_type)
8465 error ("%qs function with late return type not declared"
8466 " with %<auto%> type specifier", name);
8467 return error_mark_node;
8470 type = splice_late_return_type
8471 (type, declarator->u.function.late_return_type);
8472 if (type == error_mark_node)
8473 return error_mark_node;
8475 if (ctype == NULL_TREE
8476 && decl_context == FIELD
8478 && (friendp == 0 || dname == current_class_name))
8479 ctype = current_class_type;
8481 if (ctype && (sfk == sfk_constructor
8482 || sfk == sfk_destructor))
8484 /* We are within a class's scope. If our declarator name
8485 is the same as the class name, and we are defining
8486 a function, then it is a constructor/destructor, and
8487 therefore returns a void type. */
8489 /* ISO C++ 12.4/2. A destructor may not be declared
8490 const or volatile. A destructor may not be
8493 ISO C++ 12.1. A constructor may not be declared
8494 const or volatile. A constructor may not be
8495 virtual. A constructor may not be static. */
8497 error ((flags == DTOR_FLAG)
8498 ? "destructor cannot be static member function"
8499 : "constructor cannot be static member function");
8502 error ((flags == DTOR_FLAG)
8503 ? "destructors may not be cv-qualified"
8504 : "constructors may not be cv-qualified");
8505 memfn_quals = TYPE_UNQUALIFIED;
8508 if (decl_context == FIELD
8509 && !member_function_or_else (ctype,
8512 return error_mark_node;
8514 if (flags != DTOR_FLAG)
8516 /* It's a constructor. */
8521 permerror (input_location, "constructors cannot be declared virtual");
8524 if (decl_context == FIELD
8525 && sfk != sfk_constructor)
8526 return error_mark_node;
8528 if (decl_context == FIELD)
8534 error ("can't initialize friend function %qs", name);
8537 /* Cannot be both friend and virtual. */
8538 error ("virtual functions cannot be friends");
8541 if (decl_context == NORMAL)
8542 error ("friend declaration not in class definition");
8543 if (current_function_decl && funcdef_flag)
8544 error ("can't define friend function %qs in a local "
8548 else if (ctype && sfk == sfk_conversion)
8552 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8557 /* It is not allowed to use `constexpr' in a function
8558 declaration that is not a definition.
8559 That is too strict, though. */
8560 if (constexpr_p && !funcdef_flag)
8562 error ("the %<constexpr%> specifier cannot be used in "
8563 "a function declaration that is not a definition");
8564 constexpr_p = false;
8567 /* A constexpr non-static member function is implicitly const. */
8568 if (constexpr_p && decl_context == FIELD && staticp == 0
8569 && sfk != sfk_constructor && sfk != sfk_destructor)
8570 memfn_quals |= TYPE_QUAL_CONST;
8572 arg_types = grokparms (declarator->u.function.parameters,
8575 if (inner_declarator
8576 && inner_declarator->kind == cdk_id
8577 && inner_declarator->u.id.sfk == sfk_destructor
8578 && arg_types != void_list_node)
8580 error ("destructors may not have parameters");
8581 arg_types = void_list_node;
8585 type = build_function_type (type, arg_types);
8592 /* Filter out pointers-to-references and references-to-references.
8593 We can get these if a TYPE_DECL is used. */
8595 if (TREE_CODE (type) == REFERENCE_TYPE)
8597 if (declarator->kind != cdk_reference)
8599 error ("cannot declare pointer to %q#T", type);
8600 type = TREE_TYPE (type);
8603 /* In C++0x, we allow reference to reference declarations
8604 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8605 and template type arguments [14.3.1/4 temp.arg.type]. The
8606 check for direct reference to reference declarations, which
8607 are still forbidden, occurs below. Reasoning behind the change
8608 can be found in DR106, DR540, and the rvalue reference
8610 else if (cxx_dialect == cxx98)
8612 error ("cannot declare reference to %q#T", type);
8613 type = TREE_TYPE (type);
8616 else if (VOID_TYPE_P (type))
8618 if (declarator->kind == cdk_reference)
8619 error ("cannot declare reference to %q#T", type);
8620 else if (declarator->kind == cdk_ptrmem)
8621 error ("cannot declare pointer to %q#T member", type);
8624 /* We now know that the TYPE_QUALS don't apply to the decl,
8625 but to the target of the pointer. */
8626 type_quals = TYPE_UNQUALIFIED;
8628 if (declarator->kind == cdk_ptrmem
8629 && (TREE_CODE (type) == FUNCTION_TYPE
8630 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8632 memfn_quals |= cp_type_quals (type);
8633 type = build_memfn_type (type,
8634 declarator->u.pointer.class_type,
8636 memfn_quals = TYPE_UNQUALIFIED;
8639 if (TREE_CODE (type) == FUNCTION_TYPE
8640 && cp_type_quals (type) != TYPE_UNQUALIFIED)
8641 error (declarator->kind == cdk_reference
8642 ? G_("cannot declare reference to qualified function type %qT")
8643 : G_("cannot declare pointer to qualified function type %qT"),
8646 if (declarator->kind == cdk_reference)
8648 /* In C++0x, the type we are creating a reference to might be
8649 a typedef which is itself a reference type. In that case,
8650 we follow the reference collapsing rules in
8651 [7.1.3/8 dcl.typedef] to create the final reference type:
8653 "If a typedef TD names a type that is a reference to a type
8654 T, an attempt to create the type 'lvalue reference to cv TD'
8655 creates the type 'lvalue reference to T,' while an attempt
8656 to create the type "rvalue reference to cv TD' creates the
8659 if (!VOID_TYPE_P (type))
8660 type = cp_build_reference_type
8661 ((TREE_CODE (type) == REFERENCE_TYPE
8662 ? TREE_TYPE (type) : type),
8663 (declarator->u.reference.rvalue_ref
8664 && (TREE_CODE(type) != REFERENCE_TYPE
8665 || TYPE_REF_IS_RVALUE (type))));
8667 /* In C++0x, we need this check for direct reference to
8668 reference declarations, which are forbidden by
8669 [8.3.2/5 dcl.ref]. Reference to reference declarations
8670 are only allowed indirectly through typedefs and template
8671 type arguments. Example:
8673 void foo(int & &); // invalid ref-to-ref decl
8675 typedef int & int_ref;
8676 void foo(int_ref &); // valid ref-to-ref decl
8678 if (inner_declarator && inner_declarator->kind == cdk_reference)
8679 error ("cannot declare reference to %q#T, which is not "
8680 "a typedef or a template type argument", type);
8682 else if (TREE_CODE (type) == METHOD_TYPE)
8683 type = build_ptrmemfunc_type (build_pointer_type (type));
8684 else if (declarator->kind == cdk_ptrmem)
8686 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8688 if (declarator->u.pointer.class_type == error_mark_node)
8689 /* We will already have complained. */
8690 type = error_mark_node;
8692 type = build_ptrmem_type (declarator->u.pointer.class_type,
8696 type = build_pointer_type (type);
8698 /* Process a list of type modifier keywords (such as
8699 const or volatile) that were given inside the `*' or `&'. */
8701 if (declarator->u.pointer.qualifiers)
8704 = cp_build_qualified_type (type,
8705 declarator->u.pointer.qualifiers);
8706 type_quals = cp_type_quals (type);
8719 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8720 && TREE_CODE (type) != FUNCTION_TYPE
8721 && TREE_CODE (type) != METHOD_TYPE)
8723 error ("template-id %qD used as a declarator",
8725 unqualified_id = dname;
8728 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8729 qualified with a class-name, turn it into a METHOD_TYPE, unless
8730 we know that the function is static. We take advantage of this
8731 opportunity to do other processing that pertains to entities
8732 explicitly declared to be class members. Note that if DECLARATOR
8733 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8734 would not have exited the loop above. */
8736 && declarator->u.id.qualifying_scope
8737 && TYPE_P (declarator->u.id.qualifying_scope))
8741 ctype = declarator->u.id.qualifying_scope;
8742 ctype = TYPE_MAIN_VARIANT (ctype);
8744 while (t != NULL_TREE && CLASS_TYPE_P (t))
8746 /* You're supposed to have one `template <...>' for every
8747 template class, but you don't need one for a full
8748 specialization. For example:
8750 template <class T> struct S{};
8751 template <> struct S<int> { void f(); };
8752 void S<int>::f () {}
8754 is correct; there shouldn't be a `template <>' for the
8755 definition of `S<int>::f'. */
8756 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8757 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8758 /* T is an explicit (not partial) specialization. All
8759 containing classes must therefore also be explicitly
8762 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8763 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8764 template_count += 1;
8766 t = TYPE_MAIN_DECL (t);
8767 t = DECL_CONTEXT (t);
8770 if (ctype == current_class_type)
8774 permerror (input_location, "member functions are implicitly friends of their class");
8778 permerror (declarator->id_loc,
8779 "extra qualification %<%T::%> on member %qs",
8782 else if (/* If the qualifying type is already complete, then we
8783 can skip the following checks. */
8784 !COMPLETE_TYPE_P (ctype)
8785 && (/* If the function is being defined, then
8786 qualifying type must certainly be complete. */
8788 /* A friend declaration of "T::f" is OK, even if
8789 "T" is a template parameter. But, if this
8790 function is not a friend, the qualifying type
8792 || (!friendp && !CLASS_TYPE_P (ctype))
8793 /* For a declaration, the type need not be
8794 complete, if either it is dependent (since there
8795 is no meaningful definition of complete in that
8796 case) or the qualifying class is currently being
8798 || !(dependent_type_p (ctype)
8799 || currently_open_class (ctype)))
8800 /* Check that the qualifying type is complete. */
8801 && !complete_type_or_else (ctype, NULL_TREE))
8802 return error_mark_node;
8803 else if (TREE_CODE (type) == FUNCTION_TYPE)
8805 tree sname = declarator->u.id.unqualified_name;
8807 if (current_class_type
8808 && (!friendp || funcdef_flag))
8811 ? "cannot define member function %<%T::%s%> within %<%T%>"
8812 : "cannot declare member function %<%T::%s%> within %<%T%>",
8813 ctype, name, current_class_type);
8814 return error_mark_node;
8817 /* It is not permitted to define a member function outside ist
8818 membership class as `constexpr'. */
8820 error ("a constexpr function cannot be defined "
8821 "outside of its class");
8823 if (TREE_CODE (sname) == IDENTIFIER_NODE
8824 && NEW_DELETE_OPNAME_P (sname))
8825 /* Overloaded operator new and operator delete
8826 are always static functions. */
8829 type = build_memfn_type (type, ctype, memfn_quals);
8831 else if (declspecs->specs[(int)ds_typedef]
8832 && current_class_type)
8834 error ("cannot declare member %<%T::%s%> within %qT",
8835 ctype, name, current_class_type);
8836 return error_mark_node;
8840 /* Now TYPE has the actual type. */
8845 *attrlist = chainon (returned_attrs, *attrlist);
8847 attrlist = &returned_attrs;
8850 /* Handle parameter packs. */
8851 if (parameter_pack_p)
8853 if (decl_context == PARM)
8854 /* Turn the type into a pack expansion.*/
8855 type = make_pack_expansion (type);
8857 error ("non-parameter %qs cannot be a parameter pack", name);
8860 /* Did array size calculations overflow? */
8862 if (TREE_CODE (type) == ARRAY_TYPE
8863 && COMPLETE_TYPE_P (type)
8864 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8865 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8867 error ("size of array %qs is too large", name);
8868 /* If we proceed with the array type as it is, we'll eventually
8869 crash in tree_low_cst(). */
8870 type = error_mark_node;
8873 if ((decl_context == FIELD || decl_context == PARM)
8874 && !processing_template_decl
8875 && variably_modified_type_p (type, NULL_TREE))
8877 if (decl_context == FIELD)
8878 error ("data member may not have variably modified type %qT", type);
8880 error ("parameter may not have variably modified type %qT", type);
8881 type = error_mark_node;
8884 if (explicitp == 1 || (explicitp && friendp))
8886 /* [dcl.fct.spec] The explicit specifier shall only be used in
8887 declarations of constructors within a class definition. */
8888 error ("only declarations of constructors can be %<explicit%>");
8892 if (storage_class == sc_mutable)
8894 if (decl_context != FIELD || friendp)
8896 error ("non-member %qs cannot be declared %<mutable%>", name);
8897 storage_class = sc_none;
8899 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8901 error ("non-object member %qs cannot be declared %<mutable%>", name);
8902 storage_class = sc_none;
8904 else if (TREE_CODE (type) == FUNCTION_TYPE
8905 || TREE_CODE (type) == METHOD_TYPE)
8907 error ("function %qs cannot be declared %<mutable%>", name);
8908 storage_class = sc_none;
8912 error ("static %qs cannot be declared %<mutable%>", name);
8913 storage_class = sc_none;
8915 else if (type_quals & TYPE_QUAL_CONST)
8917 error ("const %qs cannot be declared %<mutable%>", name);
8918 storage_class = sc_none;
8922 /* If this is declaring a typedef name, return a TYPE_DECL. */
8923 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8927 /* Note that the grammar rejects storage classes
8928 in typenames, fields or parameters. */
8929 if (current_lang_name == lang_name_java)
8930 TYPE_FOR_JAVA (type) = 1;
8932 /* This declaration:
8934 typedef void f(int) const;
8936 declares a function type which is not a member of any
8937 particular class, but which is cv-qualified; for
8938 example "f S::*" declares a pointer to a const-qualified
8939 member function of S. We record the cv-qualification in the
8941 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8943 type = cp_build_qualified_type (type, memfn_quals);
8945 /* We have now dealt with these qualifiers. */
8946 memfn_quals = TYPE_UNQUALIFIED;
8949 if (decl_context == FIELD)
8950 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8952 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
8953 if (id_declarator && declarator->u.id.qualifying_scope) {
8954 error_at (DECL_SOURCE_LOCATION (decl),
8955 "typedef name may not be a nested-name-specifier");
8956 TREE_TYPE (decl) = error_mark_node;
8959 if (decl_context != FIELD)
8961 if (!current_function_decl)
8962 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8963 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8964 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8965 (current_function_decl)))
8966 /* The TYPE_DECL is "abstract" because there will be
8967 clones of this constructor/destructor, and there will
8968 be copies of this TYPE_DECL generated in those
8970 DECL_ABSTRACT (decl) = 1;
8972 else if (constructor_name_p (unqualified_id, current_class_type))
8973 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8974 "as enclosing class",
8977 /* If the user declares "typedef struct {...} foo" then the
8978 struct will have an anonymous name. Fill that name in now.
8979 Nothing can refer to it, so nothing needs know about the name
8981 if (type != error_mark_node
8984 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8985 && TYPE_ANONYMOUS_P (type)
8986 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8990 /* Replace the anonymous name with the real name everywhere. */
8991 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8993 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
8995 debug_hooks->set_name (t, decl);
8996 TYPE_NAME (t) = decl;
9000 if (TYPE_LANG_SPECIFIC (type))
9001 TYPE_WAS_ANONYMOUS (type) = 1;
9003 /* If this is a typedef within a template class, the nested
9004 type is a (non-primary) template. The name for the
9005 template needs updating as well. */
9006 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
9007 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
9008 = TYPE_IDENTIFIER (type);
9010 /* Adjust linkage now that we aren't anonymous anymore. */
9011 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9012 determine_visibility (TYPE_MAIN_DECL (type));
9014 /* FIXME remangle member functions; member functions of a
9015 type with external linkage have external linkage. */
9019 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9020 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9022 bad_specifiers (decl, "type", virtualp,
9023 memfn_quals != TYPE_UNQUALIFIED,
9024 inlinep, friendp, raises != NULL_TREE);
9029 /* Detect the case of an array type of unspecified size
9030 which came, as such, direct from a typedef name.
9031 We must copy the type, so that the array's domain can be
9032 individually set by the object's initializer. */
9034 if (type && typedef_type
9035 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9036 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9037 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9039 /* Detect where we're using a typedef of function type to declare a
9040 function. PARMS will not be set, so we must create it now. */
9042 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9044 tree decls = NULL_TREE;
9047 for (args = TYPE_ARG_TYPES (type);
9048 args && args != void_list_node;
9049 args = TREE_CHAIN (args))
9051 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9053 TREE_CHAIN (decl) = decls;
9057 parms = nreverse (decls);
9059 if (decl_context != TYPENAME)
9061 /* A cv-qualifier-seq shall only be part of the function type
9062 for a non-static member function. [8.3.5/4 dcl.fct] */
9063 if (cp_type_quals (type) != TYPE_UNQUALIFIED
9064 && (current_class_type == NULL_TREE || staticp) )
9067 ? G_("qualified function types cannot be used to "
9068 "declare static member functions")
9069 : G_("qualified function types cannot be used to "
9070 "declare free functions"));
9071 type = TYPE_MAIN_VARIANT (type);
9074 /* The qualifiers on the function type become the qualifiers on
9075 the non-static member function. */
9076 memfn_quals |= cp_type_quals (type);
9077 type_quals = TYPE_UNQUALIFIED;
9081 /* If this is a type name (such as, in a cast or sizeof),
9082 compute the type and return it now. */
9084 if (decl_context == TYPENAME)
9086 /* Note that the grammar rejects storage classes
9087 in typenames, fields or parameters. */
9088 if (type_quals != TYPE_UNQUALIFIED)
9089 type_quals = TYPE_UNQUALIFIED;
9091 /* Special case: "friend class foo" looks like a TYPENAME context. */
9094 if (type_quals != TYPE_UNQUALIFIED)
9096 error ("type qualifiers specified for friend class declaration");
9097 type_quals = TYPE_UNQUALIFIED;
9101 error ("%<inline%> specified for friend class declaration");
9107 /* Don't allow friend declaration without a class-key. */
9108 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9109 permerror (input_location, "template parameters cannot be friends");
9110 else if (TREE_CODE (type) == TYPENAME_TYPE)
9111 permerror (input_location, "friend declaration requires class-key, "
9112 "i.e. %<friend class %T::%D%>",
9113 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9115 permerror (input_location, "friend declaration requires class-key, "
9116 "i.e. %<friend %#T%>",
9120 /* Only try to do this stuff if we didn't already give up. */
9121 if (type != integer_type_node)
9123 /* A friendly class? */
9124 if (current_class_type)
9125 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9128 error ("trying to make class %qT a friend of global scope",
9131 type = void_type_node;
9134 else if (memfn_quals)
9136 if (ctype == NULL_TREE
9137 && TREE_CODE (type) == METHOD_TYPE)
9138 ctype = TYPE_METHOD_BASETYPE (type);
9141 type = build_memfn_type (type, ctype, memfn_quals);
9142 /* Core issue #547: need to allow this in template type args. */
9143 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9144 type = cp_build_qualified_type (type, memfn_quals);
9146 error ("invalid qualifiers on non-member function type");
9151 else if (unqualified_id == NULL_TREE && decl_context != PARM
9152 && decl_context != CATCHPARM
9153 && TREE_CODE (type) != UNION_TYPE
9156 error ("abstract declarator %qT used as declaration", type);
9157 return error_mark_node;
9160 /* Only functions may be declared using an operator-function-id. */
9162 && IDENTIFIER_OPNAME_P (unqualified_id)
9163 && TREE_CODE (type) != FUNCTION_TYPE
9164 && TREE_CODE (type) != METHOD_TYPE)
9166 error ("declaration of %qD as non-function", unqualified_id);
9167 return error_mark_node;
9170 /* We don't check parameter types here because we can emit a better
9171 error message later. */
9172 if (decl_context != PARM)
9174 type = check_var_type (unqualified_id, type);
9175 if (type == error_mark_node)
9176 return error_mark_node;
9179 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9180 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9182 if (decl_context == PARM || decl_context == CATCHPARM)
9184 if (ctype || in_namespace)
9185 error ("cannot use %<::%> in parameter declaration");
9187 /* A parameter declared as an array of T is really a pointer to T.
9188 One declared as a function is really a pointer to a function.
9189 One declared as a member is really a pointer to member. */
9191 if (TREE_CODE (type) == ARRAY_TYPE)
9193 /* Transfer const-ness of array into that of type pointed to. */
9194 type = build_pointer_type (TREE_TYPE (type));
9195 type_quals = TYPE_UNQUALIFIED;
9197 else if (TREE_CODE (type) == FUNCTION_TYPE)
9198 type = build_pointer_type (type);
9204 if (decl_context == PARM)
9206 decl = cp_build_parm_decl (unqualified_id, type);
9208 bad_specifiers (decl, "parameter", virtualp,
9209 memfn_quals != TYPE_UNQUALIFIED,
9210 inlinep, friendp, raises != NULL_TREE);
9212 else if (decl_context == FIELD)
9214 /* The C99 flexible array extension. */
9215 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9216 && TYPE_DOMAIN (type) == NULL_TREE)
9218 tree itype = compute_array_index_type (dname, integer_zero_node);
9219 type = build_cplus_array_type (TREE_TYPE (type), itype);
9222 if (type == error_mark_node)
9224 /* Happens when declaring arrays of sizes which
9225 are error_mark_node, for example. */
9228 else if (in_namespace && !friendp)
9230 /* Something like struct S { int N::j; }; */
9231 error ("invalid use of %<::%>");
9232 return error_mark_node;
9234 else if (TREE_CODE (type) == FUNCTION_TYPE)
9237 tree function_context;
9241 if (ctype == NULL_TREE)
9242 ctype = current_class_type;
9244 if (ctype == NULL_TREE)
9246 error ("can't make %qD into a method -- not in a class",
9248 return error_mark_node;
9251 /* ``A union may [ ... ] not [ have ] virtual functions.''
9253 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9255 error ("function %qD declared virtual inside a union",
9257 return error_mark_node;
9260 if (NEW_DELETE_OPNAME_P (unqualified_id))
9264 error ("%qD cannot be declared virtual, since it "
9270 else if (staticp < 2)
9271 type = build_memfn_type (type, ctype, memfn_quals);
9274 /* Check that the name used for a destructor makes sense. */
9275 if (sfk == sfk_destructor)
9277 tree uqname = id_declarator->u.id.unqualified_name;
9281 gcc_assert (friendp);
9282 error ("expected qualified name in friend declaration "
9283 "for destructor %qD", uqname);
9284 return error_mark_node;
9287 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9289 error ("declaration of %qD as member of %qT",
9291 return error_mark_node;
9294 error ("a destructor cannot be %<constexpr%>");
9296 else if (sfk == sfk_constructor && friendp)
9298 error ("expected qualified name in friend declaration "
9299 "for constructor %qD",
9300 id_declarator->u.id.unqualified_name);
9301 return error_mark_node;
9304 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9305 function_context = (ctype != NULL_TREE) ?
9306 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9307 publicp = (! friendp || ! staticp)
9308 && function_context == NULL_TREE;
9309 decl = grokfndecl (ctype, type,
9310 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9311 ? unqualified_id : dname,
9314 virtualp, flags, memfn_quals, raises,
9315 friendp ? -1 : 0, friendp, publicp,
9316 inlinep || constexpr_p,
9318 funcdef_flag, template_count, in_namespace,
9319 attrlist, declarator->id_loc);
9320 if (decl == NULL_TREE)
9321 return error_mark_node;
9323 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9324 /* The decl and setting of decl_attr is also turned off. */
9325 decl = build_decl_attribute_variant (decl, decl_attr);
9328 /* [class.conv.ctor]
9330 A constructor declared without the function-specifier
9331 explicit that can be called with a single parameter
9332 specifies a conversion from the type of its first
9333 parameter to the type of its class. Such a constructor
9334 is called a converting constructor. */
9336 DECL_NONCONVERTING_P (decl) = 1;
9338 else if (TREE_CODE (type) == METHOD_TYPE)
9340 /* We only get here for friend declarations of
9341 members of other classes. */
9342 /* All method decls are public, so tell grokfndecl to set
9343 TREE_PUBLIC, also. */
9344 decl = grokfndecl (ctype, type,
9345 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9346 ? unqualified_id : dname,
9349 virtualp, flags, memfn_quals, raises,
9350 friendp ? -1 : 0, friendp, 1, 0, sfk,
9351 funcdef_flag, template_count, in_namespace,
9353 declarator->id_loc);
9354 if (decl == NULL_TREE)
9355 return error_mark_node;
9357 else if (!staticp && !dependent_type_p (type)
9358 && !COMPLETE_TYPE_P (complete_type (type))
9359 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9362 error ("field %qD has incomplete type", unqualified_id);
9364 error ("name %qT has incomplete type", type);
9366 /* If we're instantiating a template, tell them which
9367 instantiation made the field's type be incomplete. */
9368 if (current_class_type
9369 && TYPE_NAME (current_class_type)
9370 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9372 && declspecs->type == type)
9373 error (" in instantiation of template %qT",
9374 current_class_type);
9376 return error_mark_node;
9382 error ("%qE is neither function nor member function; "
9383 "cannot be declared friend", unqualified_id);
9391 /* Friends are treated specially. */
9392 if (ctype == current_class_type)
9393 ; /* We already issued a permerror. */
9394 else if (decl && DECL_NAME (decl))
9396 if (template_class_depth (current_class_type) == 0)
9398 decl = check_explicit_specialization
9399 (unqualified_id, decl, template_count,
9400 2 * funcdef_flag + 4);
9401 if (decl == error_mark_node)
9402 return error_mark_node;
9405 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9406 decl = do_friend (ctype, unqualified_id, decl,
9412 return error_mark_node;
9415 /* Structure field. It may not be a function, except for C++. */
9417 if (decl == NULL_TREE)
9423 /* An attempt is being made to initialize a non-static
9424 member. But, from [class.mem]:
9426 4 A member-declarator can contain a
9427 constant-initializer only if it declares a static
9428 member (_class.static_) of integral or enumeration
9429 type, see _class.static.data_.
9431 This used to be relatively common practice, but
9432 the rest of the compiler does not correctly
9433 handle the initialization unless the member is
9434 static so we make it static below. */
9435 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9437 permerror (input_location, "making %qD static", unqualified_id);
9441 if (uses_template_parms (type))
9442 /* We'll check at instantiation time. */
9444 else if (check_static_variable_definition (unqualified_id,
9446 /* If we just return the declaration, crashes
9447 will sometimes occur. We therefore return
9448 void_type_node, as if this was a friend
9449 declaration, to cause callers to completely
9450 ignore this declaration. */
9451 return error_mark_node;
9456 /* C++ allows static class members. All other work
9457 for this is done by grokfield. */
9458 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9459 set_linkage_for_static_data_member (decl);
9460 /* Even if there is an in-class initialization, DECL
9461 is considered undefined until an out-of-class
9462 definition is provided. */
9463 DECL_EXTERNAL (decl) = 1;
9466 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9471 error ("non-static data member %qE declared %<constexpr%>",
9473 decl = build_decl (input_location,
9474 FIELD_DECL, unqualified_id, type);
9475 DECL_NONADDRESSABLE_P (decl) = bitfield;
9476 if (bitfield && !unqualified_id)
9477 TREE_NO_WARNING (decl) = 1;
9479 if (storage_class == sc_mutable)
9481 DECL_MUTABLE_P (decl) = 1;
9482 storage_class = sc_none;
9486 bad_specifiers (decl, "field", virtualp,
9487 memfn_quals != TYPE_UNQUALIFIED,
9488 inlinep, friendp, raises != NULL_TREE);
9491 else if (TREE_CODE (type) == FUNCTION_TYPE
9492 || TREE_CODE (type) == METHOD_TYPE)
9497 if (!unqualified_id)
9498 return error_mark_node;
9500 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9501 original_name = dname;
9503 original_name = unqualified_id;
9505 if (storage_class == sc_auto)
9506 error ("storage class %<auto%> invalid for function %qs", name);
9507 else if (storage_class == sc_register)
9508 error ("storage class %<register%> invalid for function %qs", name);
9510 error ("storage class %<__thread%> invalid for function %qs", name);
9512 /* Function declaration not at top level.
9513 Storage classes other than `extern' are not allowed
9514 and `extern' makes no difference. */
9515 if (! toplevel_bindings_p ()
9516 && (storage_class == sc_static
9517 || declspecs->specs[(int)ds_inline])
9520 if (storage_class == sc_static)
9521 pedwarn (input_location, OPT_pedantic,
9522 "%<static%> specified invalid for function %qs "
9523 "declared out of global scope", name);
9525 pedwarn (input_location, OPT_pedantic,
9526 "%<inline%> specifier invalid for function %qs "
9527 "declared out of global scope", name);
9530 if (ctype != NULL_TREE
9531 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9533 error ("%q#T is not a class or a namespace", ctype);
9537 if (ctype == NULL_TREE)
9541 error ("virtual non-class function %qs", name);
9544 else if (sfk == sfk_constructor
9545 || sfk == sfk_destructor)
9548 ? "%qs defined in a non-class scope"
9549 : "%qs declared in a non-class scope", name);
9553 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9554 && !NEW_DELETE_OPNAME_P (original_name))
9555 type = build_method_type_directly (ctype,
9557 TYPE_ARG_TYPES (type));
9559 /* Record presence of `static'. */
9560 publicp = (ctype != NULL_TREE
9561 || storage_class == sc_extern
9562 || storage_class != sc_static);
9564 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9565 virtualp, flags, memfn_quals, raises,
9567 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9568 template_count, in_namespace, attrlist,
9569 declarator->id_loc);
9570 if (decl == NULL_TREE)
9571 return error_mark_node;
9575 int invalid_static = 0;
9577 /* Don't allow a static member function in a class, and forbid
9578 declaring main to be static. */
9579 if (TREE_CODE (type) == METHOD_TYPE)
9581 permerror (input_location, "cannot declare member function %qD to have "
9582 "static linkage", decl);
9585 else if (current_function_decl)
9587 /* FIXME need arm citation */
9588 error ("cannot declare static function inside another function");
9595 storage_class = sc_none;
9601 /* It's a variable. */
9603 /* An uninitialized decl with `extern' is a reference. */
9604 decl = grokvardecl (type, unqualified_id,
9607 (type_quals & TYPE_QUAL_CONST) != 0,
9608 ctype ? ctype : in_namespace);
9609 bad_specifiers (decl, "variable", virtualp,
9610 memfn_quals != TYPE_UNQUALIFIED,
9611 inlinep, friendp, raises != NULL_TREE);
9615 DECL_CONTEXT (decl) = ctype;
9618 permerror (input_location, "%<static%> may not be used when defining "
9619 "(as opposed to declaring) a static data member");
9621 storage_class = sc_none;
9623 if (storage_class == sc_register && TREE_STATIC (decl))
9625 error ("static member %qD declared %<register%>", decl);
9626 storage_class = sc_none;
9628 if (storage_class == sc_extern && pedantic)
9630 pedwarn (input_location, OPT_pedantic,
9631 "cannot explicitly declare member %q#D to have "
9632 "extern linkage", decl);
9633 storage_class = sc_none;
9638 if (storage_class == sc_extern && initialized && !funcdef_flag)
9640 if (toplevel_bindings_p ())
9642 /* It's common practice (and completely valid) to have a const
9643 be initialized and declared extern. */
9644 if (!(type_quals & TYPE_QUAL_CONST))
9645 warning (0, "%qs initialized and declared %<extern%>", name);
9649 error ("%qs has both %<extern%> and initializer", name);
9650 return error_mark_node;
9654 /* Record `register' declaration for warnings on &
9655 and in case doing stupid register allocation. */
9657 if (storage_class == sc_register)
9658 DECL_REGISTER (decl) = 1;
9659 else if (storage_class == sc_extern)
9660 DECL_THIS_EXTERN (decl) = 1;
9661 else if (storage_class == sc_static)
9662 DECL_THIS_STATIC (decl) = 1;
9664 /* Don't forget constexprness. */
9665 if (VAR_OR_FUNCTION_DECL_P (decl))
9666 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9668 /* Record constancy and volatility on the DECL itself . There's
9669 no need to do this when processing a template; we'll do this
9670 for the instantiated declaration based on the type of DECL. */
9671 if (!processing_template_decl)
9672 cp_apply_type_quals_to_decl (type_quals, decl);
9678 /* Subroutine of start_function. Ensure that each of the parameter
9679 types (as listed in PARMS) is complete, as is required for a
9680 function definition. */
9683 require_complete_types_for_parms (tree parms)
9685 for (; parms; parms = TREE_CHAIN (parms))
9687 if (dependent_type_p (TREE_TYPE (parms)))
9689 if (!VOID_TYPE_P (TREE_TYPE (parms))
9690 && complete_type_or_else (TREE_TYPE (parms), parms))
9692 relayout_decl (parms);
9693 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9696 /* grokparms or complete_type_or_else will have already issued
9698 TREE_TYPE (parms) = error_mark_node;
9702 /* Returns nonzero if T is a local variable. */
9705 local_variable_p (const_tree t)
9707 if ((TREE_CODE (t) == VAR_DECL
9708 /* A VAR_DECL with a context that is a _TYPE is a static data
9710 && !TYPE_P (CP_DECL_CONTEXT (t))
9711 /* Any other non-local variable must be at namespace scope. */
9712 && !DECL_NAMESPACE_SCOPE_P (t))
9713 || (TREE_CODE (t) == PARM_DECL))
9719 /* Like local_variable_p, but suitable for use as a tree-walking
9723 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9724 void *data ATTRIBUTE_UNUSED)
9726 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9728 else if (TYPE_P (*tp))
9735 /* Check that ARG, which is a default-argument expression for a
9736 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9737 something goes wrong. DECL may also be a _TYPE node, rather than a
9738 DECL, if there is no DECL available. */
9741 check_default_argument (tree decl, tree arg)
9746 if (TREE_CODE (arg) == DEFAULT_ARG)
9747 /* We get a DEFAULT_ARG when looking at an in-class declaration
9748 with a default argument. Ignore the argument for now; we'll
9749 deal with it after the class is complete. */
9758 decl_type = TREE_TYPE (decl);
9760 if (arg == error_mark_node
9761 || decl == error_mark_node
9762 || TREE_TYPE (arg) == error_mark_node
9763 || decl_type == error_mark_node)
9764 /* Something already went wrong. There's no need to check
9766 return error_mark_node;
9768 /* [dcl.fct.default]
9770 A default argument expression is implicitly converted to the
9772 if (!TREE_TYPE (arg)
9773 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9776 error ("default argument for %q#D has type %qT",
9777 decl, TREE_TYPE (arg));
9779 error ("default argument for parameter of type %qT has type %qT",
9780 decl_type, TREE_TYPE (arg));
9782 return error_mark_node;
9785 /* [dcl.fct.default]
9787 Local variables shall not be used in default argument
9790 The keyword `this' shall not be used in a default argument of a
9792 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9795 error ("default argument %qE uses local variable %qD", arg, var);
9796 return error_mark_node;
9803 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9806 type_is_deprecated (tree type)
9808 enum tree_code code;
9809 if (TREE_DEPRECATED (type))
9811 if (TYPE_NAME (type)
9812 && TREE_DEPRECATED (TYPE_NAME (type)))
9815 /* Do warn about using typedefs to a deprecated class. */
9816 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
9817 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
9819 code = TREE_CODE (type);
9821 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9822 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9823 || code == METHOD_TYPE || code == ARRAY_TYPE)
9824 return type_is_deprecated (TREE_TYPE (type));
9826 if (TYPE_PTRMEMFUNC_P (type))
9827 return type_is_deprecated
9828 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9833 /* Decode the list of parameter types for a function type.
9834 Given the list of things declared inside the parens,
9835 return a list of types.
9837 If this parameter does not end with an ellipsis, we append
9840 *PARMS is set to the chain of PARM_DECLs created. */
9843 grokparms (tree parmlist, tree *parms)
9845 tree result = NULL_TREE;
9846 tree decls = NULL_TREE;
9850 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9852 tree type = NULL_TREE;
9853 tree init = TREE_PURPOSE (parm);
9854 tree decl = TREE_VALUE (parm);
9857 if (parm == void_list_node)
9860 if (! decl || TREE_TYPE (decl) == error_mark_node)
9863 type = TREE_TYPE (decl);
9864 if (VOID_TYPE_P (type))
9866 if (same_type_p (type, void_type_node)
9867 && DECL_SELF_REFERENCE_P (type)
9868 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9869 /* this is a parmlist of `(void)', which is ok. */
9871 cxx_incomplete_type_error (decl, type);
9872 /* It's not a good idea to actually create parameters of
9873 type `void'; other parts of the compiler assume that a
9874 void type terminates the parameter list. */
9875 type = error_mark_node;
9876 TREE_TYPE (decl) = error_mark_node;
9879 if (type != error_mark_node
9880 && TYPE_FOR_JAVA (type)
9881 && MAYBE_CLASS_TYPE_P (type))
9883 error ("parameter %qD has Java class type", decl);
9884 type = error_mark_node;
9885 TREE_TYPE (decl) = error_mark_node;
9889 if (type != error_mark_node
9890 && (errmsg = targetm.invalid_parameter_type (type)))
9893 type = error_mark_node;
9894 TREE_TYPE (decl) = error_mark_node;
9897 if (type != error_mark_node)
9899 if (deprecated_state != DEPRECATED_SUPPRESS)
9901 tree deptype = type_is_deprecated (type);
9903 warn_deprecated_use (deptype, NULL_TREE);
9906 /* Top-level qualifiers on the parameters are
9907 ignored for function types. */
9908 type = cp_build_qualified_type (type, 0);
9909 if (TREE_CODE (type) == METHOD_TYPE)
9911 error ("parameter %qD invalidly declared method type", decl);
9912 type = build_pointer_type (type);
9913 TREE_TYPE (decl) = type;
9915 else if (abstract_virtuals_error (decl, type))
9916 any_error = 1; /* Seems like a good idea. */
9917 else if (POINTER_TYPE_P (type))
9919 /* [dcl.fct]/6, parameter types cannot contain pointers
9920 (references) to arrays of unknown bound. */
9921 tree t = TREE_TYPE (type);
9922 int ptr = TYPE_PTR_P (type);
9928 else if (TREE_CODE (t) != ARRAY_TYPE)
9930 else if (!TYPE_DOMAIN (t))
9934 if (TREE_CODE (t) == ARRAY_TYPE)
9936 ? G_("parameter %qD includes pointer to array of "
9937 "unknown bound %qT")
9938 : G_("parameter %qD includes reference to array of "
9939 "unknown bound %qT"),
9945 else if (init && !processing_template_decl)
9946 init = check_default_argument (decl, init);
9949 if (TREE_CODE (decl) == PARM_DECL
9950 && FUNCTION_PARAMETER_PACK_P (decl)
9951 && TREE_CHAIN (parm)
9952 && TREE_CHAIN (parm) != void_list_node)
9953 error ("parameter packs must be at the end of the parameter list");
9955 TREE_CHAIN (decl) = decls;
9957 result = tree_cons (init, type, result);
9959 decls = nreverse (decls);
9960 result = nreverse (result);
9962 result = chainon (result, void_list_node);
9969 /* D is a constructor or overloaded `operator='.
9971 Let T be the class in which D is declared. Then, this function
9974 -1 if D's is an ill-formed constructor or copy assignment operator
9975 whose first parameter is of type `T'.
9976 0 if D is not a copy constructor or copy assignment
9978 1 if D is a copy constructor or copy assignment operator whose
9979 first parameter is a reference to non-const qualified T.
9980 2 if D is a copy constructor or copy assignment operator whose
9981 first parameter is a reference to const qualified T.
9983 This function can be used as a predicate. Positive values indicate
9984 a copy constructor and nonzero values indicate a copy assignment
9988 copy_fn_p (const_tree d)
9994 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9996 if (TREE_CODE (d) == TEMPLATE_DECL
9997 || (DECL_TEMPLATE_INFO (d)
9998 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9999 /* Instantiations of template member functions are never copy
10000 functions. Note that member functions of templated classes are
10001 represented as template functions internally, and we must
10002 accept those as copy functions. */
10005 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10009 arg_type = TREE_VALUE (args);
10010 if (arg_type == error_mark_node)
10013 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10015 /* Pass by value copy assignment operator. */
10018 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10019 && !TYPE_REF_IS_RVALUE (arg_type)
10020 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10022 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10028 args = TREE_CHAIN (args);
10030 if (args && args != void_list_node && !TREE_PURPOSE (args))
10031 /* There are more non-optional args. */
10037 /* D is a constructor or overloaded `operator='.
10039 Let T be the class in which D is declared. Then, this function
10040 returns true when D is a move constructor or move assignment
10041 operator, false otherwise. */
10044 move_fn_p (const_tree d)
10048 bool result = false;
10050 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10052 if (cxx_dialect == cxx98)
10053 /* There are no move constructors if we are in C++98 mode. */
10056 if (TREE_CODE (d) == TEMPLATE_DECL
10057 || (DECL_TEMPLATE_INFO (d)
10058 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10059 /* Instantiations of template member functions are never copy
10060 functions. Note that member functions of templated classes are
10061 represented as template functions internally, and we must
10062 accept those as copy functions. */
10065 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10069 arg_type = TREE_VALUE (args);
10070 if (arg_type == error_mark_node)
10073 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10074 && TYPE_REF_IS_RVALUE (arg_type)
10075 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10079 args = TREE_CHAIN (args);
10081 if (args && args != void_list_node && !TREE_PURPOSE (args))
10082 /* There are more non-optional args. */
10088 /* Remember any special properties of member function DECL. */
10091 grok_special_member_properties (tree decl)
10095 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10098 class_type = DECL_CONTEXT (decl);
10099 if (DECL_CONSTRUCTOR_P (decl))
10101 int ctor = copy_fn_p (decl);
10103 if (!DECL_ARTIFICIAL (decl))
10104 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10110 A non-template constructor for class X is a copy
10111 constructor if its first parameter is of type X&, const
10112 X&, volatile X& or const volatile X&, and either there
10113 are no other parameters or else all other parameters have
10114 default arguments. */
10115 TYPE_HAS_INIT_REF (class_type) = 1;
10116 if (user_provided_p (decl))
10117 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
10119 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
10121 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10123 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10124 if (user_provided_p (decl))
10125 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10127 else if (is_list_ctor (decl))
10128 TYPE_HAS_LIST_CTOR (class_type) = 1;
10130 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10134 A non-template assignment operator for class X is a copy
10135 assignment operator if its parameter is of type X, X&, const
10136 X&, volatile X& or const volatile X&. */
10138 int assop = copy_fn_p (decl);
10142 TYPE_HAS_ASSIGN_REF (class_type) = 1;
10143 if (user_provided_p (decl))
10144 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
10146 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
10151 /* Check a constructor DECL has the correct form. Complains
10152 if the class has a constructor of the form X(X). */
10155 grok_ctor_properties (const_tree ctype, const_tree decl)
10157 int ctor_parm = copy_fn_p (decl);
10163 A declaration of a constructor for a class X is ill-formed if
10164 its first parameter is of type (optionally cv-qualified) X
10165 and either there are no other parameters or else all other
10166 parameters have default arguments.
10168 We *don't* complain about member template instantiations that
10169 have this form, though; they can occur as we try to decide
10170 what constructor to use during overload resolution. Since
10171 overload resolution will never prefer such a constructor to
10172 the non-template copy constructor (which is either explicitly
10173 or implicitly defined), there's no need to worry about their
10174 existence. Theoretically, they should never even be
10175 instantiated, but that's hard to forestall. */
10176 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10184 /* An operator with this code is unary, but can also be binary. */
10187 ambi_op_p (enum tree_code code)
10189 return (code == INDIRECT_REF
10190 || code == ADDR_EXPR
10191 || code == UNARY_PLUS_EXPR
10192 || code == NEGATE_EXPR
10193 || code == PREINCREMENT_EXPR
10194 || code == PREDECREMENT_EXPR);
10197 /* An operator with this name can only be unary. */
10200 unary_op_p (enum tree_code code)
10202 return (code == TRUTH_NOT_EXPR
10203 || code == BIT_NOT_EXPR
10204 || code == COMPONENT_REF
10205 || code == TYPE_EXPR);
10208 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10209 errors are issued for invalid declarations. */
10212 grok_op_properties (tree decl, bool complain)
10214 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10216 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10217 tree name = DECL_NAME (decl);
10218 enum tree_code operator_code;
10223 /* Count the number of arguments and check for ellipsis. */
10224 for (argtype = argtypes, arity = 0;
10225 argtype && argtype != void_list_node;
10226 argtype = TREE_CHAIN (argtype))
10228 ellipsis_p = !argtype;
10230 class_type = DECL_CONTEXT (decl);
10231 if (class_type && !CLASS_TYPE_P (class_type))
10232 class_type = NULL_TREE;
10234 if (DECL_CONV_FN_P (decl))
10235 operator_code = TYPE_EXPR;
10239 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10240 if (ansi_opname (CODE) == name) \
10242 operator_code = (CODE); \
10245 else if (ansi_assopname (CODE) == name) \
10247 operator_code = (CODE); \
10248 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10252 #include "operators.def"
10253 #undef DEF_OPERATOR
10255 gcc_unreachable ();
10258 gcc_assert (operator_code != MAX_TREE_CODES);
10259 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10262 switch (operator_code)
10265 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10269 TYPE_GETS_DELETE (class_type) |= 1;
10273 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10276 case VEC_DELETE_EXPR:
10277 TYPE_GETS_DELETE (class_type) |= 2;
10284 /* [basic.std.dynamic.allocation]/1:
10286 A program is ill-formed if an allocation function is declared
10287 in a namespace scope other than global scope or declared static
10290 The same also holds true for deallocation functions. */
10291 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10292 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10294 if (DECL_NAMESPACE_SCOPE_P (decl))
10296 if (CP_DECL_CONTEXT (decl) != global_namespace)
10298 error ("%qD may not be declared within a namespace", decl);
10301 else if (!TREE_PUBLIC (decl))
10303 error ("%qD may not be declared as static", decl);
10309 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10311 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10312 DECL_IS_OPERATOR_NEW (decl) = 1;
10314 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10315 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10318 /* An operator function must either be a non-static member function
10319 or have at least one parameter of a class, a reference to a class,
10320 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10321 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10323 if (operator_code == TYPE_EXPR
10324 || operator_code == CALL_EXPR
10325 || operator_code == COMPONENT_REF
10326 || operator_code == ARRAY_REF
10327 || operator_code == NOP_EXPR)
10329 error ("%qD must be a nonstatic member function", decl);
10336 if (DECL_STATIC_FUNCTION_P (decl))
10338 error ("%qD must be either a non-static member "
10339 "function or a non-member function", decl);
10343 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10345 tree arg = non_reference (TREE_VALUE (p));
10346 if (arg == error_mark_node)
10349 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10350 because these checks are performed even on
10351 template functions. */
10352 if (MAYBE_CLASS_TYPE_P (arg)
10353 || TREE_CODE (arg) == ENUMERAL_TYPE)
10357 if (!p || p == void_list_node)
10360 error ("%qD must have an argument of class or "
10361 "enumerated type", decl);
10367 /* There are no restrictions on the arguments to an overloaded
10369 if (operator_code == CALL_EXPR)
10372 /* Warn about conversion operators that will never be used. */
10373 if (IDENTIFIER_TYPENAME_P (name)
10374 && ! DECL_TEMPLATE_INFO (decl)
10376 /* Warn only declaring the function; there is no need to
10377 warn again about out-of-class definitions. */
10378 && class_type == current_class_type)
10380 tree t = TREE_TYPE (name);
10381 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10384 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10386 if (TREE_CODE (t) == VOID_TYPE)
10387 warning (OPT_Wconversion,
10389 ? G_("conversion to a reference to void "
10390 "will never use a type conversion operator")
10391 : G_("conversion to void "
10392 "will never use a type conversion operator"));
10393 else if (class_type)
10395 if (t == class_type)
10396 warning (OPT_Wconversion,
10398 ? G_("conversion to a reference to the same type "
10399 "will never use a type conversion operator")
10400 : G_("conversion to the same type "
10401 "will never use a type conversion operator"));
10402 /* Don't force t to be complete here. */
10403 else if (MAYBE_CLASS_TYPE_P (t)
10404 && COMPLETE_TYPE_P (t)
10405 && DERIVED_FROM_P (t, class_type))
10406 warning (OPT_Wconversion,
10408 ? G_("conversion to a reference to a base class "
10409 "will never use a type conversion operator")
10410 : G_("conversion to a base class "
10411 "will never use a type conversion operator"));
10416 if (operator_code == COND_EXPR)
10419 error ("ISO C++ prohibits overloading operator ?:");
10422 else if (ellipsis_p)
10424 error ("%qD must not have variable number of arguments", decl);
10427 else if (ambi_op_p (operator_code))
10430 /* We pick the one-argument operator codes by default, so
10431 we don't have to change anything. */
10433 else if (arity == 2)
10435 /* If we thought this was a unary operator, we now know
10436 it to be a binary operator. */
10437 switch (operator_code)
10440 operator_code = MULT_EXPR;
10444 operator_code = BIT_AND_EXPR;
10447 case UNARY_PLUS_EXPR:
10448 operator_code = PLUS_EXPR;
10452 operator_code = MINUS_EXPR;
10455 case PREINCREMENT_EXPR:
10456 operator_code = POSTINCREMENT_EXPR;
10459 case PREDECREMENT_EXPR:
10460 operator_code = POSTDECREMENT_EXPR;
10464 gcc_unreachable ();
10467 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10469 if ((operator_code == POSTINCREMENT_EXPR
10470 || operator_code == POSTDECREMENT_EXPR)
10471 && ! processing_template_decl
10472 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10475 error ("postfix %qD must take %<int%> as its argument",
10478 error ("postfix %qD must take %<int%> as its second "
10486 error ("%qD must take either zero or one argument", decl);
10488 error ("%qD must take either one or two arguments", decl);
10492 /* More Effective C++ rule 6. */
10494 && (operator_code == POSTINCREMENT_EXPR
10495 || operator_code == POSTDECREMENT_EXPR
10496 || operator_code == PREINCREMENT_EXPR
10497 || operator_code == PREDECREMENT_EXPR))
10499 tree arg = TREE_VALUE (argtypes);
10500 tree ret = TREE_TYPE (TREE_TYPE (decl));
10501 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10502 arg = TREE_TYPE (arg);
10503 arg = TYPE_MAIN_VARIANT (arg);
10504 if (operator_code == PREINCREMENT_EXPR
10505 || operator_code == PREDECREMENT_EXPR)
10507 if (TREE_CODE (ret) != REFERENCE_TYPE
10508 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10510 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10511 build_reference_type (arg));
10515 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10516 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10520 else if (unary_op_p (operator_code))
10525 error ("%qD must take %<void%>", decl);
10527 error ("%qD must take exactly one argument", decl);
10531 else /* if (binary_op_p (operator_code)) */
10536 error ("%qD must take exactly one argument", decl);
10538 error ("%qD must take exactly two arguments", decl);
10542 /* More Effective C++ rule 7. */
10544 && (operator_code == TRUTH_ANDIF_EXPR
10545 || operator_code == TRUTH_ORIF_EXPR
10546 || operator_code == COMPOUND_EXPR))
10547 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10551 /* Effective C++ rule 23. */
10554 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10555 && (operator_code == PLUS_EXPR
10556 || operator_code == MINUS_EXPR
10557 || operator_code == TRUNC_DIV_EXPR
10558 || operator_code == MULT_EXPR
10559 || operator_code == TRUNC_MOD_EXPR)
10560 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10561 warning (OPT_Weffc__, "%qD should return by value", decl);
10563 /* [over.oper]/8 */
10564 for (; argtypes && argtypes != void_list_node;
10565 argtypes = TREE_CHAIN (argtypes))
10566 if (TREE_PURPOSE (argtypes))
10568 TREE_PURPOSE (argtypes) = NULL_TREE;
10569 if (operator_code == POSTINCREMENT_EXPR
10570 || operator_code == POSTDECREMENT_EXPR)
10572 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10577 error ("%qD cannot have default arguments", decl);
10585 /* Return a string giving the keyword associate with CODE. */
10587 static const char *
10588 tag_name (enum tag_types code)
10600 case typename_type:
10603 gcc_unreachable ();
10607 /* Name lookup in an elaborated-type-specifier (after the keyword
10608 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10609 elaborated-type-specifier is invalid, issue a diagnostic and return
10610 error_mark_node; otherwise, return the *_TYPE to which it referred.
10611 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10614 check_elaborated_type_specifier (enum tag_types tag_code,
10616 bool allow_template_p)
10622 struct S { struct S *p; };
10624 name lookup will find the TYPE_DECL for the implicit "S::S"
10625 typedef. Adjust for that here. */
10626 if (DECL_SELF_REFERENCE_P (decl))
10627 decl = TYPE_NAME (TREE_TYPE (decl));
10629 type = TREE_TYPE (decl);
10631 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10632 is false for this case as well. */
10633 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10635 error ("using template type parameter %qT after %qs",
10636 type, tag_name (tag_code));
10637 return error_mark_node;
10641 If the identifier resolves to a typedef-name or a template
10642 type-parameter, the elaborated-type-specifier is ill-formed.
10644 In other words, the only legitimate declaration to use in the
10645 elaborated type specifier is the implicit typedef created when
10646 the type is declared. */
10647 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10648 && !DECL_SELF_REFERENCE_P (decl)
10649 && tag_code != typename_type)
10651 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10652 error ("%q+D has a previous declaration here", decl);
10653 return error_mark_node;
10655 else if (TREE_CODE (type) != RECORD_TYPE
10656 && TREE_CODE (type) != UNION_TYPE
10657 && tag_code != enum_type
10658 && tag_code != typename_type)
10660 error ("%qT referred to as %qs", type, tag_name (tag_code));
10661 error ("%q+T has a previous declaration here", type);
10662 return error_mark_node;
10664 else if (TREE_CODE (type) != ENUMERAL_TYPE
10665 && tag_code == enum_type)
10667 error ("%qT referred to as enum", type);
10668 error ("%q+T has a previous declaration here", type);
10669 return error_mark_node;
10671 else if (!allow_template_p
10672 && TREE_CODE (type) == RECORD_TYPE
10673 && CLASSTYPE_IS_TEMPLATE (type))
10675 /* If a class template appears as elaborated type specifier
10676 without a template header such as:
10678 template <class T> class C {};
10679 void f(class C); // No template header here
10681 then the required template argument is missing. */
10682 error ("template argument required for %<%s %T%>",
10683 tag_name (tag_code),
10684 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10685 return error_mark_node;
10691 /* Lookup NAME in elaborate type specifier in scope according to
10692 SCOPE and issue diagnostics if necessary.
10693 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10694 found, and ERROR_MARK_NODE for type error. */
10697 lookup_and_check_tag (enum tag_types tag_code, tree name,
10698 tag_scope scope, bool template_header_p)
10702 if (scope == ts_global)
10704 /* First try ordinary name lookup, ignoring hidden class name
10705 injected via friend declaration. */
10706 decl = lookup_name_prefer_type (name, 2);
10707 /* If that fails, the name will be placed in the smallest
10708 non-class, non-function-prototype scope according to 3.3.1/5.
10709 We may already have a hidden name declared as friend in this
10710 scope. So lookup again but not ignoring hidden names.
10711 If we find one, that name will be made visible rather than
10712 creating a new tag. */
10714 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10717 decl = lookup_type_scope (name, scope);
10719 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10720 decl = DECL_TEMPLATE_RESULT (decl);
10722 if (decl && TREE_CODE (decl) == TYPE_DECL)
10724 /* Look for invalid nested type:
10728 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10730 error ("%qD has the same name as the class in which it is "
10733 return error_mark_node;
10736 /* Two cases we need to consider when deciding if a class
10737 template is allowed as an elaborated type specifier:
10738 1. It is a self reference to its own class.
10739 2. It comes with a template header.
10743 template <class T> class C {
10744 class C *c1; // DECL_SELF_REFERENCE_P is true
10747 template <class U> class C; // template_header_p is true
10748 template <class T> class C<T>::D {
10749 class C *c2; // DECL_SELF_REFERENCE_P is true
10752 t = check_elaborated_type_specifier (tag_code,
10755 | DECL_SELF_REFERENCE_P (decl));
10758 else if (decl && TREE_CODE (decl) == TREE_LIST)
10760 error ("reference to %qD is ambiguous", name);
10761 print_candidates (decl);
10762 return error_mark_node;
10768 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10769 Define the tag as a forward-reference if it is not defined.
10771 If a declaration is given, process it here, and report an error if
10772 multiple declarations are not identical.
10774 SCOPE is TS_CURRENT when this is also a definition. Only look in
10775 the current frame for the name (since C++ allows new names in any
10776 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10777 declaration. Only look beginning from the current scope outward up
10778 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10780 TEMPLATE_HEADER_P is true when this declaration is preceded by
10781 a set of template parameters. */
10784 xref_tag (enum tag_types tag_code, tree name,
10785 tag_scope scope, bool template_header_p)
10787 enum tree_code code;
10789 tree context = NULL_TREE;
10791 timevar_push (TV_NAME_LOOKUP);
10793 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10799 code = RECORD_TYPE;
10805 code = ENUMERAL_TYPE;
10808 gcc_unreachable ();
10811 /* In case of anonymous name, xref_tag is only called to
10812 make type node and push name. Name lookup is not required. */
10813 if (ANON_AGGRNAME_P (name))
10816 t = lookup_and_check_tag (tag_code, name,
10817 scope, template_header_p);
10819 if (t == error_mark_node)
10820 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10822 if (scope != ts_current && t && current_class_type
10823 && template_class_depth (current_class_type)
10824 && template_header_p)
10826 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10827 definition of this tag. Since, in addition, we are currently
10828 processing a (member) template declaration of a template
10829 class, we must be very careful; consider:
10836 { template <class V>
10837 friend struct S1; };
10839 Here, the S2::S1 declaration should not be confused with the
10840 outer declaration. In particular, the inner version should
10841 have a template parameter of level 2, not level 1. This
10842 would be particularly important if the member declaration
10845 template <class V = U> friend struct S1;
10847 say, when we should tsubst into `U' when instantiating
10848 S2. On the other hand, when presented with:
10858 we must find the inner binding eventually. We
10859 accomplish this by making sure that the new type we
10860 create to represent this declaration has the right
10862 context = TYPE_CONTEXT (t);
10868 /* If no such tag is yet defined, create a forward-reference node
10869 and record it as the "definition".
10870 When a real declaration of this type is found,
10871 the forward-reference will be altered into a real type. */
10872 if (code == ENUMERAL_TYPE)
10874 error ("use of enum %q#D without previous declaration", name);
10875 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10879 t = make_class_type (code);
10880 TYPE_CONTEXT (t) = context;
10881 t = pushtag (name, t, scope);
10886 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10888 if (!redeclare_class_template (t, current_template_parms))
10889 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10891 else if (!processing_template_decl
10892 && CLASS_TYPE_P (t)
10893 && CLASSTYPE_IS_TEMPLATE (t))
10895 error ("redeclaration of %qT as a non-template", t);
10896 error ("previous declaration %q+D", t);
10897 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10900 /* Make injected friend class visible. */
10901 if (scope != ts_within_enclosing_non_class
10902 && hidden_name_p (TYPE_NAME (t)))
10904 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10905 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10907 if (TYPE_TEMPLATE_INFO (t))
10909 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10910 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10915 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10919 xref_tag_from_type (tree old, tree id, tag_scope scope)
10921 enum tag_types tag_kind;
10923 if (TREE_CODE (old) == RECORD_TYPE)
10924 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10926 tag_kind = union_type;
10928 if (id == NULL_TREE)
10929 id = TYPE_IDENTIFIER (old);
10931 return xref_tag (tag_kind, id, scope, false);
10934 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10935 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10936 access_* node, and the TREE_VALUE is the type of the base-class.
10937 Non-NULL TREE_TYPE indicates virtual inheritance.
10939 Returns true if the binfo hierarchy was successfully created,
10940 false if an error was detected. */
10943 xref_basetypes (tree ref, tree base_list)
10946 tree binfo, base_binfo;
10947 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10948 unsigned max_bases = 0; /* Maximum direct bases. */
10950 tree default_access;
10951 tree igo_prev; /* Track Inheritance Graph Order. */
10953 if (ref == error_mark_node)
10956 /* The base of a derived class is private by default, all others are
10958 default_access = (TREE_CODE (ref) == RECORD_TYPE
10959 && CLASSTYPE_DECLARED_CLASS (ref)
10960 ? access_private_node : access_public_node);
10962 /* First, make sure that any templates in base-classes are
10963 instantiated. This ensures that if we call ourselves recursively
10964 we do not get confused about which classes are marked and which
10966 basep = &base_list;
10969 tree basetype = TREE_VALUE (*basep);
10971 if (!(processing_template_decl && uses_template_parms (basetype))
10972 && !complete_type_or_else (basetype, NULL))
10973 /* An incomplete type. Remove it from the list. */
10974 *basep = TREE_CHAIN (*basep);
10978 if (TREE_TYPE (*basep))
10980 if (CLASS_TYPE_P (basetype))
10981 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10982 basep = &TREE_CHAIN (*basep);
10986 TYPE_MARKED_P (ref) = 1;
10988 /* The binfo slot should be empty, unless this is an (ill-formed)
10990 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10991 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10993 binfo = make_tree_binfo (max_bases);
10995 TYPE_BINFO (ref) = binfo;
10996 BINFO_OFFSET (binfo) = size_zero_node;
10997 BINFO_TYPE (binfo) = ref;
10999 /* Apply base-class info set up to the variants of this type. */
11000 fixup_type_variants (ref);
11004 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
11005 /* An aggregate cannot have baseclasses. */
11006 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11008 if (TREE_CODE (ref) == UNION_TYPE)
11010 error ("derived union %qT invalid", ref);
11017 if (TYPE_FOR_JAVA (ref))
11019 error ("Java class %qT cannot have multiple bases", ref);
11026 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11028 if (TYPE_FOR_JAVA (ref))
11030 error ("Java class %qT cannot have virtual bases", ref);
11035 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11037 tree access = TREE_PURPOSE (base_list);
11038 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11039 tree basetype = TREE_VALUE (base_list);
11041 if (access == access_default_node)
11042 access = default_access;
11044 if (PACK_EXPANSION_P (basetype))
11045 basetype = PACK_EXPANSION_PATTERN (basetype);
11046 if (TREE_CODE (basetype) == TYPE_DECL)
11047 basetype = TREE_TYPE (basetype);
11048 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11050 error ("base type %qT fails to be a struct or class type",
11055 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11056 TYPE_FOR_JAVA (ref) = 1;
11058 base_binfo = NULL_TREE;
11059 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11061 base_binfo = TYPE_BINFO (basetype);
11062 /* The original basetype could have been a typedef'd type. */
11063 basetype = BINFO_TYPE (base_binfo);
11065 /* Inherit flags from the base. */
11066 TYPE_HAS_NEW_OPERATOR (ref)
11067 |= TYPE_HAS_NEW_OPERATOR (basetype);
11068 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11069 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11070 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11071 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11072 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11073 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11074 CLASSTYPE_REPEATED_BASE_P (ref)
11075 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11078 /* We must do this test after we've seen through a typedef
11080 if (TYPE_MARKED_P (basetype))
11082 if (basetype == ref)
11083 error ("recursive type %qT undefined", basetype);
11085 error ("duplicate base type %qT invalid", basetype);
11089 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11090 /* Regenerate the pack expansion for the bases. */
11091 basetype = make_pack_expansion (basetype);
11093 TYPE_MARKED_P (basetype) = 1;
11095 base_binfo = copy_binfo (base_binfo, basetype, ref,
11096 &igo_prev, via_virtual);
11097 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11098 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11100 BINFO_BASE_APPEND (binfo, base_binfo);
11101 BINFO_BASE_ACCESS_APPEND (binfo, access);
11104 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11105 /* If we have space in the vbase vector, we must have shared at
11106 least one of them, and are therefore diamond shaped. */
11107 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11109 /* Unmark all the types. */
11110 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11111 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11112 TYPE_MARKED_P (ref) = 0;
11114 /* Now see if we have a repeated base type. */
11115 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11117 for (base_binfo = binfo; base_binfo;
11118 base_binfo = TREE_CHAIN (base_binfo))
11120 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11122 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11125 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11127 for (base_binfo = binfo; base_binfo;
11128 base_binfo = TREE_CHAIN (base_binfo))
11129 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11130 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11139 /* Begin compiling the definition of an enumeration type.
11142 UNDERLYING_TYPE is the type that will be used as the storage for
11143 the enumeration type. This should be NULL_TREE if no storage type
11146 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11148 Returns the type object, as yet incomplete.
11149 Also records info about it so that build_enumerator
11150 may be used to declare the individual values as they are read. */
11153 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
11157 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11159 /* If this is the real definition for a previous forward reference,
11160 fill in the contents in the same object that used to be the
11161 forward reference. */
11163 enumtype = lookup_and_check_tag (enum_type, name,
11164 /*tag_scope=*/ts_current,
11165 /*template_header_p=*/false);
11167 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11169 error_at (input_location, "multiple definition of %q#T", enumtype);
11170 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11171 "previous definition here");
11172 /* Clear out TYPE_VALUES, and start again. */
11173 TYPE_VALUES (enumtype) = NULL_TREE;
11177 /* In case of error, make a dummy enum to allow parsing to
11179 if (enumtype == error_mark_node)
11180 name = make_anon_name ();
11182 enumtype = cxx_make_type (ENUMERAL_TYPE);
11183 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11186 if (enumtype == error_mark_node)
11191 SET_SCOPED_ENUM_P (enumtype, 1);
11192 begin_scope (sk_scoped_enum, enumtype);
11194 /* [C++0x dcl.enum]p5:
11196 If not explicitly specified, the underlying type of a scoped
11197 enumeration type is int. */
11198 if (!underlying_type)
11199 underlying_type = integer_type_node;
11202 if (underlying_type)
11204 if (CP_INTEGRAL_TYPE_P (underlying_type))
11206 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11207 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11208 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11209 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11210 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11211 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11212 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11213 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11214 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11215 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11217 else if (!dependent_type_p (underlying_type))
11218 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11219 underlying_type, enumtype);
11225 /* After processing and defining all the values of an enumeration type,
11226 install their decls in the enumeration type and finish it off.
11227 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11230 finish_enum (tree enumtype)
11239 bool use_short_enum;
11244 tree underlying_type = NULL_TREE;
11245 bool fixed_underlying_type_p
11246 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11248 /* We built up the VALUES in reverse order. */
11249 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11251 /* For an enum defined in a template, just set the type of the values;
11252 all further processing is postponed until the template is
11253 instantiated. We need to set the type so that tsubst of a CONST_DECL
11255 if (processing_template_decl)
11257 for (values = TYPE_VALUES (enumtype);
11259 values = TREE_CHAIN (values))
11260 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11261 if (at_function_scope_p ())
11262 add_stmt (build_min (TAG_DEFN, enumtype));
11263 if (SCOPED_ENUM_P (enumtype))
11268 /* Determine the minimum and maximum values of the enumerators. */
11269 if (TYPE_VALUES (enumtype))
11271 minnode = maxnode = NULL_TREE;
11273 for (values = TYPE_VALUES (enumtype);
11275 values = TREE_CHAIN (values))
11277 decl = TREE_VALUE (values);
11279 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11280 each enumerator has the type of its enumeration. Prior to the
11281 closing brace, the type of each enumerator is the type of its
11282 initializing value. */
11283 TREE_TYPE (decl) = enumtype;
11285 /* Update the minimum and maximum values, if appropriate. */
11286 value = DECL_INITIAL (decl);
11287 if (value == error_mark_node)
11288 value = integer_zero_node;
11289 /* Figure out what the minimum and maximum values of the
11290 enumerators are. */
11292 minnode = maxnode = value;
11293 else if (tree_int_cst_lt (maxnode, value))
11295 else if (tree_int_cst_lt (value, minnode))
11302 If the enumerator-list is empty, the underlying type is as if
11303 the enumeration had a single enumerator with value 0. */
11304 minnode = maxnode = integer_zero_node;
11306 /* Compute the number of bits require to represent all values of the
11307 enumeration. We must do this before the type of MINNODE and
11308 MAXNODE are transformed, since tree_int_cst_min_precision relies
11309 on the TREE_TYPE of the value it is passed. */
11310 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11311 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11312 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11313 precision = MAX (lowprec, highprec);
11315 if (!fixed_underlying_type_p)
11317 /* Determine the underlying type of the enumeration.
11321 The underlying type of an enumeration is an integral type that
11322 can represent all the enumerator values defined in the
11323 enumeration. It is implementation-defined which integral type is
11324 used as the underlying type for an enumeration except that the
11325 underlying type shall not be larger than int unless the value of
11326 an enumerator cannot fit in an int or unsigned int.
11328 We use "int" or an "unsigned int" as the underlying type, even if
11329 a smaller integral type would work, unless the user has
11330 explicitly requested that we use the smallest possible type. The
11331 user can request that for all enumerations with a command line
11332 flag, or for just one enumeration with an attribute. */
11334 use_short_enum = flag_short_enums
11335 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11337 for (itk = (use_short_enum ? itk_char : itk_int);
11341 underlying_type = integer_types[itk];
11342 if (TYPE_PRECISION (underlying_type) >= precision
11343 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11346 if (itk == itk_none)
11350 IF no integral type can represent all the enumerator values, the
11351 enumeration is ill-formed. */
11352 error ("no integral type can represent all of the enumerator values "
11353 "for %qT", enumtype);
11354 precision = TYPE_PRECISION (long_long_integer_type_node);
11355 underlying_type = integer_types[itk_unsigned_long_long];
11360 The value of sizeof() applied to an enumeration type, an object
11361 of an enumeration type, or an enumerator, is the value of sizeof()
11362 applied to the underlying type. */
11363 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11364 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11365 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11366 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11367 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11368 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11370 /* Set the underlying type of the enumeration type to the
11371 computed enumeration type, restricted to the enumerator
11373 ENUM_UNDERLYING_TYPE (enumtype)
11374 = build_distinct_type_copy (underlying_type);
11375 set_min_and_max_values_for_integral_type
11376 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11379 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11381 /* Compute the minimum and maximum values for the type.
11385 For an enumeration where emin is the smallest enumerator and emax
11386 is the largest, the values of the enumeration are the values of the
11387 underlying type in the range bmin to bmax, where bmin and bmax are,
11388 respectively, the smallest and largest values of the smallest bit-
11389 field that can store emin and emax. */
11391 /* The middle-end currently assumes that types with TYPE_PRECISION
11392 narrower than their underlying type are suitably zero or sign
11393 extended to fill their mode. g++ doesn't make these guarantees.
11394 Until the middle-end can represent such paradoxical types, we
11395 set the TYPE_PRECISION to the width of the underlying type. */
11396 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11398 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11400 /* Convert each of the enumerators to the type of the underlying
11401 type of the enumeration. */
11402 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11404 location_t saved_location;
11406 decl = TREE_VALUE (values);
11407 saved_location = input_location;
11408 input_location = DECL_SOURCE_LOCATION (decl);
11409 if (fixed_underlying_type_p)
11410 /* If the enumeration type has a fixed underlying type, we
11411 already checked all of the enumerator values. */
11412 value = DECL_INITIAL (decl);
11414 value = perform_implicit_conversion (underlying_type,
11415 DECL_INITIAL (decl),
11416 tf_warning_or_error);
11417 input_location = saved_location;
11419 /* Do not clobber shared ints. */
11420 value = copy_node (value);
11422 TREE_TYPE (value) = enumtype;
11423 DECL_INITIAL (decl) = value;
11426 /* Fix up all variant types of this enum type. */
11427 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11429 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11430 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11431 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11432 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11433 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11434 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11435 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11436 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11437 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11438 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11439 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11442 /* Finish up the scope of a scoped enumeration. */
11443 if (SCOPED_ENUM_P (enumtype))
11446 /* Finish debugging output for this type. */
11447 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11450 /* Build and install a CONST_DECL for an enumeration constant of the
11451 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11452 Assignment of sequential values by default is handled here. */
11455 build_enumerator (tree name, tree value, tree enumtype)
11461 /* If the VALUE was erroneous, pretend it wasn't there; that will
11462 result in the enum being assigned the next value in sequence. */
11463 if (value == error_mark_node)
11466 /* Remove no-op casts from the value. */
11468 STRIP_TYPE_NOPS (value);
11470 if (! processing_template_decl)
11472 /* Validate and default VALUE. */
11473 if (value != NULL_TREE)
11475 value = integral_constant_value (value);
11477 if (TREE_CODE (value) == INTEGER_CST)
11479 value = perform_integral_promotions (value);
11480 constant_expression_warning (value);
11484 error ("enumerator value for %qD is not an integer constant", name);
11489 /* Default based on previous value. */
11490 if (value == NULL_TREE)
11492 if (TYPE_VALUES (enumtype))
11495 unsigned HOST_WIDE_INT lo;
11499 /* The next value is the previous value plus one.
11500 add_double doesn't know the type of the target expression,
11501 so we must check with int_fits_type_p as well. */
11502 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11503 if (error_operand_p (prev_value))
11504 value = error_mark_node;
11507 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11508 TREE_INT_CST_HIGH (prev_value),
11510 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11512 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11516 error ("overflow in enumeration values at %qD", name);
11517 value = error_mark_node;
11522 value = integer_zero_node;
11525 /* Remove no-op casts from the value. */
11526 STRIP_TYPE_NOPS (value);
11528 /* If the underlying type of the enum is fixed, check whether
11529 the enumerator values fits in the underlying type. If it
11530 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11531 if (ENUM_UNDERLYING_TYPE (enumtype)
11533 && TREE_CODE (value) == INTEGER_CST
11534 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11536 error ("enumerator value %E is too large for underlying type %<%T%>",
11537 value, ENUM_UNDERLYING_TYPE (enumtype));
11539 /* Silently convert the value so that we can continue. */
11540 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11545 /* C++ associates enums with global, function, or class declarations. */
11546 context = current_scope ();
11548 /* Build the actual enumeration constant. Note that the enumeration
11549 constants have the underlying type of the enum (if it is fixed)
11550 or the type of their initializer (if the underlying type of the
11551 enum is not fixed):
11555 If the underlying type is fixed, the type of each enumerator
11556 prior to the closing brace is the underlying type; if the
11557 initializing value of an enumerator cannot be represented by
11558 the underlying type, the program is ill-formed. If the
11559 underlying type is not fixed, the type of each enumerator is
11560 the type of its initializing value.
11562 If the underlying type is not fixed, it will be computed by
11563 finish_enum and we will reset the type of this enumerator. Of
11564 course, if we're processing a template, there may be no value. */
11565 type = value ? TREE_TYPE (value) : NULL_TREE;
11567 if (context && context == current_class_type)
11568 /* This enum declaration is local to the class. We need the full
11569 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11570 decl = build_lang_decl (CONST_DECL, name, type);
11572 /* It's a global enum, or it's local to a function. (Note local to
11573 a function could mean local to a class method. */
11574 decl = build_decl (input_location, CONST_DECL, name, type);
11576 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11577 TREE_CONSTANT (decl) = 1;
11578 TREE_READONLY (decl) = 1;
11579 DECL_INITIAL (decl) = value;
11581 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11582 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11583 on the TYPE_FIELDS list for `S'. (That's so that you can say
11584 things like `S::i' later.) */
11585 finish_member_declaration (decl);
11589 /* Add this enumeration constant to the list for this type. */
11590 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11593 /* Look for an enumerator with the given NAME within the enumeration
11594 type ENUMTYPE. This routine is used primarily for qualified name
11595 lookup into an enumerator in C++0x, e.g.,
11597 enum class Color { Red, Green, Blue };
11599 Color color = Color::Red;
11601 Returns the value corresponding to the enumerator, or
11602 NULL_TREE if no such enumerator was found. */
11604 lookup_enumerator (tree enumtype, tree name)
11607 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11609 e = purpose_member (name, TYPE_VALUES (enumtype));
11610 return e? TREE_VALUE (e) : NULL_TREE;
11614 /* We're defining DECL. Make sure that its type is OK. */
11617 check_function_type (tree decl, tree current_function_parms)
11619 tree fntype = TREE_TYPE (decl);
11620 tree return_type = complete_type (TREE_TYPE (fntype));
11622 /* In a function definition, arg types must be complete. */
11623 require_complete_types_for_parms (current_function_parms);
11625 /* constexpr functions must have literal argument types and
11626 literal return type. */
11627 validate_constexpr_fundecl (decl);
11629 if (dependent_type_p (return_type))
11631 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11632 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11634 tree args = TYPE_ARG_TYPES (fntype);
11636 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11637 error ("return type %q#T is incomplete", return_type);
11639 error ("return type has Java class type %q#T", return_type);
11641 /* Make it return void instead. */
11642 if (TREE_CODE (fntype) == METHOD_TYPE)
11643 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11645 TREE_CHAIN (args));
11647 fntype = build_function_type (void_type_node, args);
11649 = build_exception_variant (fntype,
11650 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11651 fntype = (cp_build_type_attribute_variant
11652 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11653 TREE_TYPE (decl) = fntype;
11656 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11659 /* Create the FUNCTION_DECL for a function definition.
11660 DECLSPECS and DECLARATOR are the parts of the declaration;
11661 they describe the function's name and the type it returns,
11662 but twisted together in a fashion that parallels the syntax of C.
11664 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11665 DECLARATOR is really the DECL for the function we are about to
11666 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11667 indicating that the function is an inline defined in-class.
11669 This function creates a binding context for the function body
11670 as well as setting up the FUNCTION_DECL in current_function_decl.
11672 For C++, we must first check whether that datum makes any sense.
11673 For example, "class A local_a(1,2);" means that variable local_a
11674 is an aggregate of type A, which should have a constructor
11675 applied to it with the argument list [1, 2].
11677 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11678 or may be a BLOCK if the function has been defined previously
11679 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11680 error_mark_node if the function has never been defined, or
11681 a BLOCK if the function has been defined somewhere. */
11684 start_preparsed_function (tree decl1, tree attrs, int flags)
11686 tree ctype = NULL_TREE;
11689 int doing_friend = 0;
11690 struct cp_binding_level *bl;
11691 tree current_function_parms;
11692 struct c_fileinfo *finfo
11693 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11694 bool honor_interface;
11696 /* Sanity check. */
11697 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11698 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11700 fntype = TREE_TYPE (decl1);
11701 if (TREE_CODE (fntype) == METHOD_TYPE)
11702 ctype = TYPE_METHOD_BASETYPE (fntype);
11704 /* ISO C++ 11.4/5. A friend function defined in a class is in
11705 the (lexical) scope of the class in which it is defined. */
11706 if (!ctype && DECL_FRIEND_P (decl1))
11708 ctype = DECL_FRIEND_CONTEXT (decl1);
11710 /* CTYPE could be null here if we're dealing with a template;
11711 for example, `inline friend float foo()' inside a template
11712 will have no CTYPE set. */
11713 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11719 if (DECL_DECLARED_INLINE_P (decl1)
11720 && lookup_attribute ("noinline", attrs))
11721 warning (0, "inline function %q+D given attribute noinline", decl1);
11723 /* Handle gnu_inline attribute. */
11724 if (GNU_INLINE_P (decl1))
11726 DECL_EXTERNAL (decl1) = 1;
11727 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11728 DECL_INTERFACE_KNOWN (decl1) = 1;
11729 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11732 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11733 /* This is a constructor, we must ensure that any default args
11734 introduced by this definition are propagated to the clones
11735 now. The clones are used directly in overload resolution. */
11736 adjust_clone_args (decl1);
11738 /* Sometimes we don't notice that a function is a static member, and
11739 build a METHOD_TYPE for it. Fix that up now. */
11740 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11741 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11743 revert_static_member_fn (decl1);
11747 /* Set up current_class_type, and enter the scope of the class, if
11750 push_nested_class (ctype);
11751 else if (DECL_STATIC_FUNCTION_P (decl1))
11752 push_nested_class (DECL_CONTEXT (decl1));
11754 /* Now that we have entered the scope of the class, we must restore
11755 the bindings for any template parameters surrounding DECL1, if it
11756 is an inline member template. (Order is important; consider the
11757 case where a template parameter has the same name as a field of
11758 the class.) It is not until after this point that
11759 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11760 if (flags & SF_INCLASS_INLINE)
11761 maybe_begin_member_template_processing (decl1);
11763 /* Effective C++ rule 15. */
11765 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11766 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11767 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11769 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11770 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11771 if (!DECL_INITIAL (decl1))
11772 DECL_INITIAL (decl1) = error_mark_node;
11774 /* This function exists in static storage.
11775 (This does not mean `static' in the C sense!) */
11776 TREE_STATIC (decl1) = 1;
11778 /* We must call push_template_decl after current_class_type is set
11779 up. (If we are processing inline definitions after exiting a
11780 class scope, current_class_type will be NULL_TREE until set above
11781 by push_nested_class.) */
11782 if (processing_template_decl)
11784 /* FIXME: Handle error_mark_node more gracefully. */
11785 tree newdecl1 = push_template_decl (decl1);
11786 if (newdecl1 != error_mark_node)
11790 /* We are now in the scope of the function being defined. */
11791 current_function_decl = decl1;
11793 /* Save the parm names or decls from this function's declarator
11794 where store_parm_decls will find them. */
11795 current_function_parms = DECL_ARGUMENTS (decl1);
11797 /* Make sure the parameter and return types are reasonable. When
11798 you declare a function, these types can be incomplete, but they
11799 must be complete when you define the function. */
11800 check_function_type (decl1, current_function_parms);
11802 /* Build the return declaration for the function. */
11803 restype = TREE_TYPE (fntype);
11804 if (DECL_RESULT (decl1) == NULL_TREE)
11808 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11809 DECL_ARTIFICIAL (resdecl) = 1;
11810 DECL_IGNORED_P (resdecl) = 1;
11811 DECL_RESULT (decl1) = resdecl;
11813 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11816 /* Let the user know we're compiling this function. */
11817 announce_function (decl1);
11819 /* Record the decl so that the function name is defined.
11820 If we already have a decl for this name, and it is a FUNCTION_DECL,
11821 use the old decl. */
11822 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11824 /* A specialization is not used to guide overload resolution. */
11825 if (!DECL_FUNCTION_MEMBER_P (decl1)
11826 && !(DECL_USE_TEMPLATE (decl1) &&
11827 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11829 tree olddecl = pushdecl (decl1);
11831 if (olddecl == error_mark_node)
11832 /* If something went wrong when registering the declaration,
11833 use DECL1; we have to have a FUNCTION_DECL to use when
11834 parsing the body of the function. */
11838 /* Otherwise, OLDDECL is either a previous declaration
11839 of the same function or DECL1 itself. */
11841 if (warn_missing_declarations
11842 && olddecl == decl1
11843 && !DECL_MAIN_P (decl1)
11844 && TREE_PUBLIC (decl1)
11845 && !DECL_DECLARED_INLINE_P (decl1))
11849 /* Check whether DECL1 is in an anonymous
11851 for (context = DECL_CONTEXT (decl1);
11853 context = DECL_CONTEXT (context))
11855 if (TREE_CODE (context) == NAMESPACE_DECL
11856 && DECL_NAME (context) == NULL_TREE)
11860 if (context == NULL)
11861 warning (OPT_Wmissing_declarations,
11862 "no previous declaration for %q+D", decl1);
11870 /* We need to set the DECL_CONTEXT. */
11871 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11872 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11874 fntype = TREE_TYPE (decl1);
11876 /* If #pragma weak applies, mark the decl appropriately now.
11877 The pragma only applies to global functions. Because
11878 determining whether or not the #pragma applies involves
11879 computing the mangled name for the declaration, we cannot
11880 apply the pragma until after we have merged this declaration
11881 with any previous declarations; if the original declaration
11882 has a linkage specification, that specification applies to
11883 the definition as well, and may affect the mangled name. */
11884 if (!DECL_CONTEXT (decl1))
11885 maybe_apply_pragma_weak (decl1);
11888 /* Reset this in case the call to pushdecl changed it. */
11889 current_function_decl = decl1;
11891 gcc_assert (DECL_INITIAL (decl1));
11893 /* This function may already have been parsed, in which case just
11894 return; our caller will skip over the body without parsing. */
11895 if (DECL_INITIAL (decl1) != error_mark_node)
11898 /* Initialize RTL machinery. We cannot do this until
11899 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11900 even when processing a template; this is how we get
11901 CFUN set up, and our per-function variables initialized.
11902 FIXME factor out the non-RTL stuff. */
11903 bl = current_binding_level;
11904 allocate_struct_function (decl1, processing_template_decl);
11906 /* Initialize the language data structures. Whenever we start
11907 a new function, we destroy temporaries in the usual way. */
11908 cfun->language = GGC_CNEW (struct language_function);
11909 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11910 current_binding_level = bl;
11912 /* Even though we're inside a function body, we still don't want to
11913 call expand_expr to calculate the size of a variable-sized array.
11914 We haven't necessarily assigned RTL to all variables yet, so it's
11915 not safe to try to expand expressions involving them. */
11916 cfun->dont_save_pending_sizes_p = 1;
11918 /* Start the statement-tree, start the tree now. */
11919 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11921 /* If we are (erroneously) defining a function that we have already
11922 defined before, wipe out what we knew before. */
11923 if (!DECL_PENDING_INLINE_P (decl1))
11924 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11926 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11928 /* We know that this was set up by `grokclassfn'. We do not
11929 wait until `store_parm_decls', since evil parse errors may
11930 never get us to that point. Here we keep the consistency
11931 between `current_class_type' and `current_class_ptr'. */
11932 tree t = DECL_ARGUMENTS (decl1);
11934 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11935 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11937 cp_function_chain->x_current_class_ref
11938 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
11939 cp_function_chain->x_current_class_ptr = t;
11941 /* Constructors and destructors need to know whether they're "in
11942 charge" of initializing virtual base classes. */
11943 t = TREE_CHAIN (t);
11944 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11946 current_in_charge_parm = t;
11947 t = TREE_CHAIN (t);
11949 if (DECL_HAS_VTT_PARM_P (decl1))
11951 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11952 current_vtt_parm = t;
11956 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11957 /* Implicitly-defined methods (like the
11958 destructor for a class in which no destructor
11959 is explicitly declared) must not be defined
11960 until their definition is needed. So, we
11961 ignore interface specifications for
11962 compiler-generated functions. */
11963 && !DECL_ARTIFICIAL (decl1));
11965 if (DECL_INTERFACE_KNOWN (decl1))
11967 tree ctx = decl_function_context (decl1);
11969 if (DECL_NOT_REALLY_EXTERN (decl1))
11970 DECL_EXTERNAL (decl1) = 0;
11972 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11973 && TREE_PUBLIC (ctx))
11974 /* This is a function in a local class in an extern inline
11976 comdat_linkage (decl1);
11978 /* If this function belongs to an interface, it is public.
11979 If it belongs to someone else's interface, it is also external.
11980 This only affects inlines and template instantiations. */
11981 else if (!finfo->interface_unknown && honor_interface)
11983 if (DECL_DECLARED_INLINE_P (decl1)
11984 || DECL_TEMPLATE_INSTANTIATION (decl1)
11985 || processing_template_decl)
11987 DECL_EXTERNAL (decl1)
11988 = (finfo->interface_only
11989 || (DECL_DECLARED_INLINE_P (decl1)
11990 && ! flag_implement_inlines
11991 && !DECL_VINDEX (decl1)));
11993 /* For WIN32 we also want to put these in linkonce sections. */
11994 maybe_make_one_only (decl1);
11997 DECL_EXTERNAL (decl1) = 0;
11998 DECL_INTERFACE_KNOWN (decl1) = 1;
11999 /* If this function is in an interface implemented in this file,
12000 make sure that the back end knows to emit this function
12002 if (!DECL_EXTERNAL (decl1))
12003 mark_needed (decl1);
12005 else if (finfo->interface_unknown && finfo->interface_only
12006 && honor_interface)
12008 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12009 interface, we will have both finfo->interface_unknown and
12010 finfo->interface_only set. In that case, we don't want to
12011 use the normal heuristics because someone will supply a
12012 #pragma implementation elsewhere, and deducing it here would
12013 produce a conflict. */
12014 comdat_linkage (decl1);
12015 DECL_EXTERNAL (decl1) = 0;
12016 DECL_INTERFACE_KNOWN (decl1) = 1;
12017 DECL_DEFER_OUTPUT (decl1) = 1;
12021 /* This is a definition, not a reference.
12022 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12023 if (!GNU_INLINE_P (decl1))
12024 DECL_EXTERNAL (decl1) = 0;
12026 if ((DECL_DECLARED_INLINE_P (decl1)
12027 || DECL_TEMPLATE_INSTANTIATION (decl1))
12028 && ! DECL_INTERFACE_KNOWN (decl1))
12029 DECL_DEFER_OUTPUT (decl1) = 1;
12031 DECL_INTERFACE_KNOWN (decl1) = 1;
12034 /* Determine the ELF visibility attribute for the function. We must not
12035 do this before calling "pushdecl", as we must allow "duplicate_decls"
12036 to merge any attributes appropriately. We also need to wait until
12038 if (!DECL_CLONED_FUNCTION_P (decl1))
12039 determine_visibility (decl1);
12041 begin_scope (sk_function_parms, decl1);
12045 if (DECL_DESTRUCTOR_P (decl1)
12046 || (DECL_CONSTRUCTOR_P (decl1)
12047 && targetm.cxx.cdtor_returns_this ()))
12049 cdtor_label = build_decl (input_location,
12050 LABEL_DECL, NULL_TREE, NULL_TREE);
12051 DECL_CONTEXT (cdtor_label) = current_function_decl;
12054 start_fname_decls ();
12056 store_parm_decls (current_function_parms);
12060 /* Like start_preparsed_function, except that instead of a
12061 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12063 Returns 1 on success. If the DECLARATOR is not suitable for a function
12064 (it defines a datum instead), we return 0, which tells
12065 yyparse to report a parse error. */
12068 start_function (cp_decl_specifier_seq *declspecs,
12069 const cp_declarator *declarator,
12074 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12075 if (decl1 == error_mark_node)
12077 /* If the declarator is not suitable for a function definition,
12078 cause a syntax error. */
12079 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12081 error ("invalid function declaration");
12085 if (DECL_MAIN_P (decl1))
12086 /* main must return int. grokfndecl should have corrected it
12087 (and issued a diagnostic) if the user got it wrong. */
12088 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12089 integer_type_node));
12091 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12096 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12100 use_eh_spec_block (tree fn)
12102 return (flag_exceptions && flag_enforce_eh_specs
12103 && !processing_template_decl
12104 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
12105 /* We insert the EH_SPEC_BLOCK only in the original
12106 function; then, it is copied automatically to the
12108 && !DECL_CLONED_FUNCTION_P (fn)
12109 /* Implicitly-generated constructors and destructors have
12110 exception specifications. However, those specifications
12111 are the union of the possible exceptions specified by the
12112 constructors/destructors for bases and members, so no
12113 unallowed exception will ever reach this function. By
12114 not creating the EH_SPEC_BLOCK we save a little memory,
12115 and we avoid spurious warnings about unreachable
12117 && !DECL_ARTIFICIAL (fn));
12120 /* Store the parameter declarations into the current function declaration.
12121 This is called after parsing the parameter declarations, before
12122 digesting the body of the function.
12124 Also install to binding contour return value identifier, if any. */
12127 store_parm_decls (tree current_function_parms)
12129 tree fndecl = current_function_decl;
12132 /* This is a chain of any other decls that came in among the parm
12133 declarations. If a parm is declared with enum {foo, bar} x;
12134 then CONST_DECLs for foo and bar are put here. */
12135 tree nonparms = NULL_TREE;
12137 if (current_function_parms)
12139 /* This case is when the function was defined with an ANSI prototype.
12140 The parms already have decls, so we need not do anything here
12141 except record them as in effect
12142 and complain if any redundant old-style parm decls were written. */
12144 tree specparms = current_function_parms;
12147 /* Must clear this because it might contain TYPE_DECLs declared
12149 current_binding_level->names = NULL;
12151 /* If we're doing semantic analysis, then we'll call pushdecl
12152 for each of these. We must do them in reverse order so that
12153 they end in the correct forward order. */
12154 specparms = nreverse (specparms);
12156 for (parm = specparms; parm; parm = next)
12158 next = TREE_CHAIN (parm);
12159 if (TREE_CODE (parm) == PARM_DECL)
12161 if (DECL_NAME (parm) == NULL_TREE
12162 || TREE_CODE (parm) != VOID_TYPE)
12165 error ("parameter %qD declared void", parm);
12169 /* If we find an enum constant or a type tag,
12170 put it aside for the moment. */
12171 TREE_CHAIN (parm) = NULL_TREE;
12172 nonparms = chainon (nonparms, parm);
12176 /* Get the decls in their original chain order and record in the
12177 function. This is all and only the PARM_DECLs that were
12178 pushed into scope by the loop above. */
12179 DECL_ARGUMENTS (fndecl) = getdecls ();
12182 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12184 /* Now store the final chain of decls for the arguments
12185 as the decl-chain of the current lexical scope.
12186 Put the enumerators in as well, at the front so that
12187 DECL_ARGUMENTS is not modified. */
12188 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12190 if (use_eh_spec_block (current_function_decl))
12191 current_eh_spec_block = begin_eh_spec_block ();
12195 /* We have finished doing semantic analysis on DECL, but have not yet
12196 generated RTL for its body. Save away our current state, so that
12197 when we want to generate RTL later we know what to do. */
12200 save_function_data (tree decl)
12202 struct language_function *f;
12204 /* Save the language-specific per-function data so that we can
12205 get it back when we really expand this function. */
12206 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12209 f = GGC_NEW (struct language_function);
12210 memcpy (f, cp_function_chain, sizeof (struct language_function));
12211 DECL_SAVED_FUNCTION_DATA (decl) = f;
12213 /* Clear out the bits we don't need. */
12214 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12215 f->bindings = NULL;
12216 f->x_local_names = NULL;
12220 /* Set the return value of the constructor (if present). */
12223 finish_constructor_body (void)
12228 if (targetm.cxx.cdtor_returns_this ()
12229 && (! TYPE_FOR_JAVA (current_class_type)))
12231 /* Any return from a constructor will end up here. */
12232 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12234 val = DECL_ARGUMENTS (current_function_decl);
12235 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12236 DECL_RESULT (current_function_decl), val);
12237 /* Return the address of the object. */
12238 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12239 add_stmt (exprstmt);
12243 /* Do all the processing for the beginning of a destructor; set up the
12244 vtable pointers and cleanups for bases and members. */
12247 begin_destructor_body (void)
12249 tree compound_stmt;
12251 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12252 issued an error message. We still want to try to process the
12253 body of the function, but initialize_vtbl_ptrs will crash if
12254 TYPE_BINFO is NULL. */
12255 if (COMPLETE_TYPE_P (current_class_type))
12257 compound_stmt = begin_compound_stmt (0);
12258 /* Make all virtual function table pointers in non-virtual base
12259 classes point to CURRENT_CLASS_TYPE's virtual function
12261 initialize_vtbl_ptrs (current_class_ptr);
12262 finish_compound_stmt (compound_stmt);
12264 /* And insert cleanups for our bases and members so that they
12265 will be properly destroyed if we throw. */
12266 push_base_cleanups ();
12270 /* At the end of every destructor we generate code to delete the object if
12271 necessary. Do that now. */
12274 finish_destructor_body (void)
12278 /* Any return from a destructor will end up here; that way all base
12279 and member cleanups will be run when the function returns. */
12280 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12282 /* In a virtual destructor, we must call delete. */
12283 if (DECL_VIRTUAL_P (current_function_decl))
12286 tree virtual_size = cxx_sizeof (current_class_type);
12290 At the point of definition of a virtual destructor (including
12291 an implicit definition), non-placement operator delete shall
12292 be looked up in the scope of the destructor's class and if
12293 found shall be accessible and unambiguous. */
12294 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12296 /*global_p=*/false,
12297 /*placement=*/NULL_TREE,
12298 /*alloc_fn=*/NULL_TREE);
12300 if_stmt = begin_if_stmt ();
12301 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12302 current_in_charge_parm,
12305 finish_expr_stmt (exprstmt);
12306 finish_then_clause (if_stmt);
12307 finish_if_stmt (if_stmt);
12310 if (targetm.cxx.cdtor_returns_this ())
12314 val = DECL_ARGUMENTS (current_function_decl);
12315 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12316 DECL_RESULT (current_function_decl), val);
12317 /* Return the address of the object. */
12318 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12319 add_stmt (exprstmt);
12323 /* Do the necessary processing for the beginning of a function body, which
12324 in this case includes member-initializers, but not the catch clauses of
12325 a function-try-block. Currently, this means opening a binding level
12326 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12329 begin_function_body (void)
12333 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12336 if (processing_template_decl)
12337 /* Do nothing now. */;
12339 /* Always keep the BLOCK node associated with the outermost pair of
12340 curly braces of a function. These are needed for correct
12341 operation of dwarfout.c. */
12342 keep_next_level (true);
12344 stmt = begin_compound_stmt (BCS_FN_BODY);
12346 if (processing_template_decl)
12347 /* Do nothing now. */;
12348 else if (DECL_DESTRUCTOR_P (current_function_decl))
12349 begin_destructor_body ();
12354 /* Do the processing for the end of a function body. Currently, this means
12355 closing out the cleanups for fully-constructed bases and members, and in
12356 the case of the destructor, deleting the object if desired. Again, this
12357 is only meaningful for [cd]tors, since they are the only functions where
12358 there is a significant distinction between the main body and any
12359 function catch clauses. Handling, say, main() return semantics here
12360 would be wrong, as flowing off the end of a function catch clause for
12361 main() would also need to return 0. */
12364 finish_function_body (tree compstmt)
12366 if (compstmt == NULL_TREE)
12369 /* Close the block. */
12370 finish_compound_stmt (compstmt);
12372 if (processing_template_decl)
12373 /* Do nothing now. */;
12374 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12375 finish_constructor_body ();
12376 else if (DECL_DESTRUCTOR_P (current_function_decl))
12377 finish_destructor_body ();
12380 /* Given a function, returns the BLOCK corresponding to the outermost level
12381 of curly braces, skipping the artificial block created for constructor
12385 outer_curly_brace_block (tree fndecl)
12387 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12388 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12389 /* Skip the artificial function body block. */
12390 block = BLOCK_SUBBLOCKS (block);
12394 /* Finish up a function declaration and compile that function
12395 all the way to assembler language output. The free the storage
12396 for the function definition.
12398 FLAGS is a bitwise or of the following values:
12400 We just finished processing the body of an in-class inline
12401 function definition. (This processing will have taken place
12402 after the class definition is complete.) */
12405 finish_function (int flags)
12407 tree fndecl = current_function_decl;
12408 tree fntype, ctype = NULL_TREE;
12409 int inclass_inline = (flags & 2) != 0;
12412 /* When we get some parse errors, we can end up without a
12413 current_function_decl, so cope. */
12414 if (fndecl == NULL_TREE)
12415 return error_mark_node;
12417 gcc_assert (!defer_mark_used_calls);
12418 defer_mark_used_calls = true;
12420 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12421 && DECL_VIRTUAL_P (fndecl)
12422 && !processing_template_decl)
12424 tree fnclass = DECL_CONTEXT (fndecl);
12425 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12426 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12429 nested = function_depth > 1;
12430 fntype = TREE_TYPE (fndecl);
12432 /* TREE_READONLY (fndecl) = 1;
12433 This caused &foo to be of type ptr-to-const-function
12434 which then got a warning when stored in a ptr-to-function variable. */
12436 gcc_assert (building_stmt_tree ());
12437 /* The current function is being defined, so its DECL_INITIAL should
12438 be set, and unless there's a multiple definition, it should be
12439 error_mark_node. */
12440 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12442 /* For a cloned function, we've already got all the code we need;
12443 there's no need to add any extra bits. */
12444 if (!DECL_CLONED_FUNCTION_P (fndecl))
12446 if (DECL_MAIN_P (current_function_decl))
12450 /* Make it so that `main' always returns 0 by default (or
12453 stmt = finish_return_stmt (integer_one_node);
12455 stmt = finish_return_stmt (integer_zero_node);
12457 /* Hack. We don't want the middle-end to warn that this
12458 return is unreachable, so put the statement on the
12461 location_t linezero = linemap_line_start (line_table, 0, 1);
12462 SET_EXPR_LOCATION (stmt, linezero);
12466 if (use_eh_spec_block (current_function_decl))
12467 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12468 (TREE_TYPE (current_function_decl)),
12469 current_eh_spec_block);
12472 /* If we're saving up tree structure, tie off the function now. */
12473 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12475 finish_fname_decls ();
12477 /* If this function can't throw any exceptions, remember that. */
12478 if (!processing_template_decl
12479 && !cp_function_chain->can_throw
12480 && !flag_non_call_exceptions
12481 && !DECL_REPLACEABLE_P (fndecl))
12482 TREE_NOTHROW (fndecl) = 1;
12484 /* This must come after expand_function_end because cleanups might
12485 have declarations (from inline functions) that need to go into
12486 this function's blocks. */
12488 /* If the current binding level isn't the outermost binding level
12489 for this function, either there is a bug, or we have experienced
12490 syntax errors and the statement tree is malformed. */
12491 if (current_binding_level->kind != sk_function_parms)
12493 /* Make sure we have already experienced errors. */
12494 gcc_assert (errorcount);
12496 /* Throw away the broken statement tree and extra binding
12498 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12500 while (current_binding_level->kind != sk_function_parms)
12502 if (current_binding_level->kind == sk_class)
12503 pop_nested_class ();
12505 poplevel (0, 0, 0);
12508 poplevel (1, 0, 1);
12510 /* Statements should always be full-expressions at the outermost set
12511 of curly braces for a function. */
12512 gcc_assert (stmts_are_full_exprs_p ());
12514 /* Set up the named return value optimization, if we can. Candidate
12515 variables are selected in check_return_expr. */
12516 if (current_function_return_value)
12518 tree r = current_function_return_value;
12521 if (r != error_mark_node
12522 /* This is only worth doing for fns that return in memory--and
12523 simpler, since we don't have to worry about promoted modes. */
12524 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12525 /* Only allow this for variables declared in the outer scope of
12526 the function so we know that their lifetime always ends with a
12527 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12528 we were to do this optimization in tree-ssa. */
12529 && (outer = outer_curly_brace_block (fndecl))
12530 && chain_member (r, BLOCK_VARS (outer)))
12531 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12533 current_function_return_value = NULL_TREE;
12536 /* Remember that we were in class scope. */
12537 if (current_class_name)
12538 ctype = current_class_type;
12540 /* Must mark the RESULT_DECL as being in this function. */
12541 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12543 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12544 to the FUNCTION_DECL node itself. */
12545 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12547 /* Save away current state, if appropriate. */
12548 if (!processing_template_decl)
12549 save_function_data (fndecl);
12551 /* Complain if there's just no return statement. */
12552 if (warn_return_type
12553 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12554 && !dependent_type_p (TREE_TYPE (fntype))
12555 && !current_function_returns_value && !current_function_returns_null
12556 /* Don't complain if we abort or throw. */
12557 && !current_function_returns_abnormally
12558 /* Don't complain if we are declared noreturn. */
12559 && !TREE_THIS_VOLATILE (fndecl)
12560 && !DECL_NAME (DECL_RESULT (fndecl))
12561 && !TREE_NO_WARNING (fndecl)
12562 /* Structor return values (if any) are set by the compiler. */
12563 && !DECL_CONSTRUCTOR_P (fndecl)
12564 && !DECL_DESTRUCTOR_P (fndecl))
12566 warning (OPT_Wreturn_type,
12567 "no return statement in function returning non-void");
12568 TREE_NO_WARNING (fndecl) = 1;
12571 /* Store the end of the function, so that we get good line number
12572 info for the epilogue. */
12573 cfun->function_end_locus = input_location;
12575 /* Genericize before inlining. */
12576 if (!processing_template_decl)
12578 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12579 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
12580 cp_genericize (fndecl);
12581 /* Clear out the bits we don't need. */
12582 f->x_current_class_ptr = NULL;
12583 f->x_current_class_ref = NULL;
12584 f->x_eh_spec_block = NULL;
12585 f->x_in_charge_parm = NULL;
12586 f->x_vtt_parm = NULL;
12587 f->x_return_value = NULL;
12588 f->bindings = NULL;
12589 f->extern_decl_map = NULL;
12591 /* Clear out the bits we don't need. */
12592 local_names = NULL;
12594 /* We're leaving the context of this function, so zap cfun. It's still in
12595 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12597 current_function_decl = NULL;
12599 /* If this is an in-class inline definition, we may have to pop the
12600 bindings for the template parameters that we added in
12601 maybe_begin_member_template_processing when start_function was
12603 if (inclass_inline)
12604 maybe_end_member_template_processing ();
12606 /* Leave the scope of the class. */
12608 pop_nested_class ();
12614 /* Let the error reporting routines know that we're outside a
12615 function. For a nested function, this value is used in
12616 cxx_pop_function_context and then reset via pop_function_context. */
12617 current_function_decl = NULL_TREE;
12619 defer_mark_used_calls = false;
12620 if (deferred_mark_used_calls)
12625 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12627 VEC_free (tree, gc, deferred_mark_used_calls);
12633 /* Create the FUNCTION_DECL for a function definition.
12634 DECLSPECS and DECLARATOR are the parts of the declaration;
12635 they describe the return type and the name of the function,
12636 but twisted together in a fashion that parallels the syntax of C.
12638 This function creates a binding context for the function body
12639 as well as setting up the FUNCTION_DECL in current_function_decl.
12641 Returns a FUNCTION_DECL on success.
12643 If the DECLARATOR is not suitable for a function (it defines a datum
12644 instead), we return 0, which tells yyparse to report a parse error.
12646 May return void_type_node indicating that this method is actually
12647 a friend. See grokfield for more details.
12649 Came here with a `.pushlevel' .
12651 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12652 CHANGES TO CODE IN `grokfield'. */
12655 grokmethod (cp_decl_specifier_seq *declspecs,
12656 const cp_declarator *declarator, tree attrlist)
12658 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12661 if (fndecl == error_mark_node)
12662 return error_mark_node;
12664 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12666 error ("invalid member function declaration");
12667 return error_mark_node;
12671 cplus_decl_attributes (&fndecl, attrlist, 0);
12673 /* Pass friends other than inline friend functions back. */
12674 if (fndecl == void_type_node)
12677 if (DECL_IN_AGGR_P (fndecl))
12679 if (DECL_CONTEXT (fndecl)
12680 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12681 error ("%qD is already defined in class %qT", fndecl,
12682 DECL_CONTEXT (fndecl));
12683 return error_mark_node;
12686 check_template_shadow (fndecl);
12688 DECL_DECLARED_INLINE_P (fndecl) = 1;
12689 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12691 /* We process method specializations in finish_struct_1. */
12692 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12694 fndecl = push_template_decl (fndecl);
12695 if (fndecl == error_mark_node)
12699 if (! DECL_FRIEND_P (fndecl))
12701 if (TREE_CHAIN (fndecl))
12703 fndecl = copy_node (fndecl);
12704 TREE_CHAIN (fndecl) = NULL_TREE;
12708 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12710 DECL_IN_AGGR_P (fndecl) = 1;
12715 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12716 we can lay it out later, when and if its type becomes complete. */
12719 maybe_register_incomplete_var (tree var)
12721 gcc_assert (TREE_CODE (var) == VAR_DECL);
12723 /* Keep track of variables with incomplete types. */
12724 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12725 && DECL_EXTERNAL (var))
12727 tree inner_type = TREE_TYPE (var);
12729 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12730 inner_type = TREE_TYPE (inner_type);
12731 inner_type = TYPE_MAIN_VARIANT (inner_type);
12733 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12734 /* RTTI TD entries are created while defining the type_info. */
12735 || (TYPE_LANG_SPECIFIC (inner_type)
12736 && TYPE_BEING_DEFINED (inner_type)))
12737 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12741 /* Called when a class type (given by TYPE) is defined. If there are
12742 any existing VAR_DECLs whose type has been completed by this
12743 declaration, update them now. */
12746 complete_vars (tree type)
12748 tree *list = &incomplete_vars;
12750 gcc_assert (CLASS_TYPE_P (type));
12753 if (same_type_p (type, TREE_PURPOSE (*list)))
12755 tree var = TREE_VALUE (*list);
12756 tree type = TREE_TYPE (var);
12757 /* Complete the type of the variable. The VAR_DECL itself
12758 will be laid out in expand_expr. */
12759 complete_type (type);
12760 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12761 /* Remove this entry from the list. */
12762 *list = TREE_CHAIN (*list);
12765 list = &TREE_CHAIN (*list);
12768 /* Check for pending declarations which may have abstract type. */
12769 complete_type_check_abstract (type);
12772 /* If DECL is of a type which needs a cleanup, build and return an
12773 expression to perform that cleanup here. Return NULL_TREE if no
12774 cleanup need be done. */
12777 cxx_maybe_build_cleanup (tree decl)
12783 /* Assume no cleanup is required. */
12784 cleanup = NULL_TREE;
12786 if (error_operand_p (decl))
12789 /* Handle "__attribute__((cleanup))". We run the cleanup function
12790 before the destructor since the destructor is what actually
12791 terminates the lifetime of the object. */
12792 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12799 /* Get the name specified by the user for the cleanup function. */
12800 id = TREE_VALUE (TREE_VALUE (attr));
12801 /* Look up the name to find the cleanup function to call. It is
12802 important to use lookup_name here because that is what is
12803 used in c-common.c:handle_cleanup_attribute when performing
12804 initial checks on the attribute. Note that those checks
12805 include ensuring that the function found is not an overloaded
12806 function, or an object with an overloaded call operator,
12807 etc.; we can rely on the fact that the function found is an
12808 ordinary FUNCTION_DECL. */
12809 fn = lookup_name (id);
12810 arg = build_address (decl);
12812 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12814 tf_warning_or_error);
12816 /* Handle ordinary C++ destructors. */
12817 type = TREE_TYPE (decl);
12818 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12820 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12821 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12822 && CLASSTYPE_VBASECLASSES (type));
12826 if (TREE_CODE (type) == ARRAY_TYPE)
12829 addr = build_address (decl);
12831 /* Optimize for space over speed here. */
12832 if (!has_vbases || flag_expensive_optimizations)
12833 flags |= LOOKUP_NONVIRTUAL;
12835 call = build_delete (TREE_TYPE (addr), addr,
12836 sfk_complete_destructor, flags, 0);
12838 cleanup = build_compound_expr (input_location, cleanup, call);
12846 /* When a stmt has been parsed, this function is called. */
12853 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
12854 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
12855 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
12858 static_fn_type (tree memfntype)
12864 if (TYPE_PTRMEMFUNC_P (memfntype))
12865 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
12866 if (POINTER_TYPE_P (memfntype)
12867 || TREE_CODE (memfntype) == FUNCTION_DECL)
12868 memfntype = TREE_TYPE (memfntype);
12869 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
12871 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
12872 args = TYPE_ARG_TYPES (memfntype);
12873 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
12874 quals = cp_type_quals (TREE_TYPE (TREE_VALUE (args)));
12875 fntype = build_qualified_type (fntype, quals);
12876 fntype = (cp_build_type_attribute_variant
12877 (fntype, TYPE_ATTRIBUTES (memfntype)));
12878 fntype = (build_exception_variant
12879 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
12883 /* DECL was originally constructed as a non-static member function,
12884 but turned out to be static. Update it accordingly. */
12887 revert_static_member_fn (tree decl)
12889 TREE_TYPE (decl) = static_fn_type (decl);
12891 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
12892 error ("static member function %q#D declared with type qualifiers", decl);
12894 if (DECL_ARGUMENTS (decl))
12895 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12896 DECL_STATIC_FUNCTION_P (decl) = 1;
12899 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12900 one of the language-independent trees. */
12902 enum cp_tree_node_structure_enum
12903 cp_tree_node_structure (union lang_tree_node * t)
12905 switch (TREE_CODE (&t->generic))
12907 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12908 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12909 case OVERLOAD: return TS_CP_OVERLOAD;
12910 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12911 case PTRMEM_CST: return TS_CP_PTRMEM;
12912 case BASELINK: return TS_CP_BASELINK;
12913 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12914 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12915 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12916 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
12917 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
12918 default: return TS_CP_GENERIC;
12922 /* Build the void_list_node (void_type_node having been created). */
12924 build_void_list_node (void)
12926 tree t = build_tree_list (NULL_TREE, void_type_node);
12931 cp_missing_noreturn_ok_p (tree decl)
12933 /* A missing noreturn is ok for the `main' function. */
12934 return DECL_MAIN_P (decl);
12937 /* Return the COMDAT group into which DECL should be placed. */
12940 cxx_comdat_group (tree decl)
12944 /* Virtual tables, construction virtual tables, and virtual table
12945 tables all go in a single COMDAT group, named after the primary
12947 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12948 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12949 /* For all other DECLs, the COMDAT group is the mangled name of the
12950 declaration itself. */
12953 while (DECL_THUNK_P (decl))
12955 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12956 into the same section as the target function. In that case
12957 we must return target's name. */
12958 tree target = THUNK_TARGET (decl);
12959 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12960 && DECL_SECTION_NAME (target) != NULL
12961 && DECL_ONE_ONLY (target))
12966 name = DECL_ASSEMBLER_NAME (decl);
12972 #include "gt-cp-decl.h"