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);
107 static tree next_initializable_field (tree);
109 /* The following symbols are subsumed in the cp_global_trees array, and
110 listed here individually for documentation purposes.
113 tree wchar_decl_node;
115 tree vtable_entry_type;
116 tree delta_type_node;
117 tree __t_desc_type_node;
119 tree class_type_node;
120 tree unknown_type_node;
122 Array type `vtable_entry_type[]'
125 tree vtbl_ptr_type_node;
132 A FUNCTION_DECL which can call `abort'. Not necessarily the
133 one that the user will declare, but sufficient to be called
134 by routines that want to abort the program.
138 The FUNCTION_DECL for the default `::operator delete'.
140 tree global_delete_fndecl;
143 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
144 tree tinfo_var_id; */
146 tree cp_global_trees[CPTI_MAX];
148 /* Indicates that there is a type value in some namespace, although
149 that is not necessarily in scope at the moment. */
151 tree global_type_node;
153 /* The node that holds the "name" of the global scope. */
154 tree global_scope_name;
156 #define local_names cp_function_chain->x_local_names
158 /* A list of objects which have constructors or destructors
159 which reside in the global scope. The decl is stored in
160 the TREE_VALUE slot and the initializer is stored
161 in the TREE_PURPOSE slot. */
162 tree static_aggregates;
166 /* A node for the integer constants 2, and 3. */
168 tree integer_two_node, integer_three_node;
170 /* Used only for jumps to as-yet undefined labels, since jumps to
171 defined labels can have their validity checked immediately. */
173 struct GTY(()) named_label_use_entry {
174 struct named_label_use_entry *next;
175 /* The binding level to which this entry is *currently* attached.
176 This is initially the binding level in which the goto appeared,
177 but is modified as scopes are closed. */
178 struct cp_binding_level *binding_level;
179 /* The head of the names list that was current when the goto appeared,
180 or the inner scope popped. These are the decls that will *not* be
181 skipped when jumping to the label. */
183 /* The location of the goto, for error reporting. */
184 location_t o_goto_locus;
185 /* True if an OpenMP structured block scope has been closed since
186 the goto appeared. This means that the branch from the label will
187 illegally exit an OpenMP scope. */
191 /* A list of all LABEL_DECLs in the function that have names. Here so
192 we can clear out their names' definitions at the end of the
193 function, and so we can check the validity of jumps to these labels. */
195 struct GTY(()) named_label_entry {
196 /* The decl itself. */
199 /* The binding level to which the label is *currently* attached.
200 This is initially set to the binding level in which the label
201 is defined, but is modified as scopes are closed. */
202 struct cp_binding_level *binding_level;
203 /* The head of the names list that was current when the label was
204 defined, or the inner scope popped. These are the decls that will
205 be skipped when jumping to the label. */
207 /* A tree list of all decls from all binding levels that would be
208 crossed by a backward branch to the label. */
211 /* A list of uses of the label, before the label is defined. */
212 struct named_label_use_entry *uses;
214 /* The following bits are set after the label is defined, and are
215 updated as scopes are popped. They indicate that a backward jump
216 to the label will illegally enter a scope of the given flavor. */
222 #define named_labels cp_function_chain->x_named_labels
224 /* The number of function bodies which we are currently processing.
225 (Zero if we are at namespace scope, one inside the body of a
226 function, two inside the body of a function in a local class, etc.) */
229 /* To avoid unwanted recursion, finish_function defers all mark_used calls
230 encountered during its execution until it finishes. */
231 bool defer_mark_used_calls;
232 VEC(tree, gc) *deferred_mark_used_calls;
234 /* States indicating how grokdeclarator() should handle declspecs marked
235 with __attribute__((deprecated)). An object declared as
236 __attribute__((deprecated)) suppresses warnings of uses of other
238 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
241 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
242 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
243 time the VAR_DECL was declared, the type was incomplete. */
245 static GTY(()) tree incomplete_vars;
247 /* Returns the kind of template specialization we are currently
248 processing, given that it's declaration contained N_CLASS_SCOPES
249 explicit scope qualifications. */
252 current_tmpl_spec_kind (int n_class_scopes)
254 int n_template_parm_scopes = 0;
255 int seen_specialization_p = 0;
256 int innermost_specialization_p = 0;
257 struct cp_binding_level *b;
259 /* Scan through the template parameter scopes. */
260 for (b = current_binding_level;
261 b->kind == sk_template_parms;
264 /* If we see a specialization scope inside a parameter scope,
265 then something is wrong. That corresponds to a declaration
268 template <class T> template <> ...
270 which is always invalid since [temp.expl.spec] forbids the
271 specialization of a class member template if the enclosing
272 class templates are not explicitly specialized as well. */
273 if (b->explicit_spec_p)
275 if (n_template_parm_scopes == 0)
276 innermost_specialization_p = 1;
278 seen_specialization_p = 1;
280 else if (seen_specialization_p == 1)
281 return tsk_invalid_member_spec;
283 ++n_template_parm_scopes;
286 /* Handle explicit instantiations. */
287 if (processing_explicit_instantiation)
289 if (n_template_parm_scopes != 0)
290 /* We've seen a template parameter list during an explicit
291 instantiation. For example:
293 template <class T> template void f(int);
295 This is erroneous. */
296 return tsk_invalid_expl_inst;
298 return tsk_expl_inst;
301 if (n_template_parm_scopes < n_class_scopes)
302 /* We've not seen enough template headers to match all the
303 specialized classes present. For example:
305 template <class T> void R<T>::S<T>::f(int);
307 This is invalid; there needs to be one set of template
308 parameters for each class. */
309 return tsk_insufficient_parms;
310 else if (n_template_parm_scopes == n_class_scopes)
311 /* We're processing a non-template declaration (even though it may
312 be a member of a template class.) For example:
314 template <class T> void S<T>::f(int);
316 The `class T' matches the `S<T>', leaving no template headers
317 corresponding to the `f'. */
319 else if (n_template_parm_scopes > n_class_scopes + 1)
320 /* We've got too many template headers. For example:
322 template <> template <class T> void f (T);
324 There need to be more enclosing classes. */
325 return tsk_excessive_parms;
327 /* This must be a template. It's of the form:
329 template <class T> template <class U> void S<T>::f(U);
331 This is a specialization if the innermost level was a
332 specialization; otherwise it's just a definition of the
334 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
337 /* Exit the current scope. */
345 /* When a label goes out of scope, check to see if that label was used
346 in a valid manner, and issue any appropriate warnings or errors. */
349 pop_label (tree label, tree old_value)
351 if (!processing_template_decl)
353 if (DECL_INITIAL (label) == NULL_TREE)
357 error ("label %q+D used but not defined", label);
358 location = input_location; /* FIXME want (input_filename, (line)0) */
359 /* Avoid crashing later. */
360 define_label (location, DECL_NAME (label));
363 warn_for_unused_label (label);
366 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
369 /* At the end of a function, all labels declared within the function
370 go out of scope. BLOCK is the top-level block for the
374 pop_labels_1 (void **slot, void *data)
376 struct named_label_entry *ent = (struct named_label_entry *) *slot;
377 tree block = (tree) data;
379 pop_label (ent->label_decl, NULL_TREE);
381 /* Put the labels into the "variables" of the top-level block,
382 so debugger can see them. */
383 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
384 BLOCK_VARS (block) = ent->label_decl;
386 htab_clear_slot (named_labels, slot);
392 pop_labels (tree block)
396 htab_traverse (named_labels, pop_labels_1, block);
401 /* At the end of a block with local labels, restore the outer definition. */
404 pop_local_label (tree label, tree old_value)
406 struct named_label_entry dummy;
409 pop_label (label, old_value);
411 dummy.label_decl = label;
412 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
413 htab_clear_slot (named_labels, slot);
416 /* The following two routines are used to interface to Objective-C++.
417 The binding level is purposely treated as an opaque type. */
420 objc_get_current_scope (void)
422 return current_binding_level;
425 /* The following routine is used by the NeXT-style SJLJ exceptions;
426 variables get marked 'volatile' so as to not be clobbered by
427 _setjmp()/_longjmp() calls. All variables in the current scope,
428 as well as parent scopes up to (but not including) ENCLOSING_BLK
429 shall be thusly marked. */
432 objc_mark_locals_volatile (void *enclosing_blk)
434 struct cp_binding_level *scope;
436 for (scope = current_binding_level;
437 scope && scope != enclosing_blk;
438 scope = scope->level_chain)
442 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
443 objc_volatilize_decl (decl);
445 /* Do not climb up past the current function. */
446 if (scope->kind == sk_function_parms)
451 /* Update data for defined and undefined labels when leaving a scope. */
454 poplevel_named_label_1 (void **slot, void *data)
456 struct named_label_entry *ent = (struct named_label_entry *) *slot;
457 struct cp_binding_level *bl = (struct cp_binding_level *) data;
458 struct cp_binding_level *obl = bl->level_chain;
460 if (ent->binding_level == bl)
464 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
465 if (decl_jump_unsafe (decl))
466 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
468 ent->binding_level = obl;
469 ent->names_in_scope = obl->names;
473 ent->in_try_scope = true;
476 ent->in_catch_scope = true;
479 ent->in_omp_scope = true;
487 struct named_label_use_entry *use;
489 for (use = ent->uses; use ; use = use->next)
490 if (use->binding_level == bl)
492 use->binding_level = obl;
493 use->names_in_scope = obl->names;
494 if (bl->kind == sk_omp)
495 use->in_omp_scope = true;
502 /* Exit a binding level.
503 Pop the level off, and restore the state of the identifier-decl mappings
504 that were in effect when this level was entered.
506 If KEEP == 1, this level had explicit declarations, so
507 and create a "block" (a BLOCK node) for the level
508 to record its declarations and subblocks for symbol table output.
510 If FUNCTIONBODY is nonzero, this level is the body of a function,
511 so create a block as if KEEP were set and also clear out all
514 If REVERSE is nonzero, reverse the order of decls before putting
515 them into the BLOCK. */
518 poplevel (int keep, int reverse, int functionbody)
521 /* The chain of decls was accumulated in reverse order.
522 Put it into forward order, just for cleanliness. */
527 int leaving_for_scope;
530 timevar_push (TV_NAME_LOOKUP);
535 gcc_assert (current_binding_level->kind != sk_class);
537 if (current_binding_level->kind == sk_cleanup)
539 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
541 gcc_assert (!VEC_length(cp_class_binding,
542 current_binding_level->class_shadowed));
544 /* We used to use KEEP == 2 to indicate that the new block should go
545 at the beginning of the list of blocks at this binding level,
546 rather than the end. This hack is no longer used. */
547 gcc_assert (keep == 0 || keep == 1);
549 if (current_binding_level->keep)
552 /* Any uses of undefined labels, and any defined labels, now operate
553 under constraints of next binding contour. */
554 if (cfun && !functionbody && named_labels)
555 htab_traverse (named_labels, poplevel_named_label_1,
556 current_binding_level);
558 /* Get the decls in the order they were written.
559 Usually current_binding_level->names is in reverse order.
560 But parameter decls were previously put in forward order. */
563 current_binding_level->names
564 = decls = nreverse (current_binding_level->names);
566 decls = current_binding_level->names;
568 /* If there were any declarations or structure tags in that level,
569 or if this level is a function body,
570 create a BLOCK to record them for the life of this function. */
572 if (keep == 1 || functionbody)
573 block = make_node (BLOCK);
574 if (block != NULL_TREE)
576 BLOCK_VARS (block) = decls;
577 BLOCK_SUBBLOCKS (block) = subblocks;
580 /* In each subblock, record that this is its superior. */
582 for (link = subblocks; link; link = BLOCK_CHAIN (link))
583 BLOCK_SUPERCONTEXT (link) = block;
585 /* We still support the old for-scope rules, whereby the variables
586 in a for-init statement were in scope after the for-statement
587 ended. We only use the new rules if flag_new_for_scope is
590 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
592 /* Before we remove the declarations first check for unused variables. */
593 if (warn_unused_variable
594 && !processing_template_decl)
595 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
596 if (TREE_CODE (decl) == VAR_DECL
597 && ! TREE_USED (decl)
598 && ! DECL_IN_SYSTEM_HEADER (decl)
599 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
600 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
602 /* Remove declarations for all the DECLs in this level. */
603 for (link = decls; link; link = TREE_CHAIN (link))
605 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
608 tree name = DECL_NAME (link);
612 ob = outer_binding (name,
613 IDENTIFIER_BINDING (name),
616 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
618 ns_binding = NULL_TREE;
620 if (ob && ob->scope == current_binding_level->level_chain)
621 /* We have something like:
626 and we are leaving the `for' scope. There's no reason to
627 keep the binding of the inner `i' in this case. */
628 pop_binding (name, link);
629 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
630 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
631 /* Here, we have something like:
639 We must pop the for-scope binding so we know what's a
640 type and what isn't. */
641 pop_binding (name, link);
644 /* Mark this VAR_DECL as dead so that we can tell we left it
645 there only for backward compatibility. */
646 DECL_DEAD_FOR_LOCAL (link) = 1;
648 /* Keep track of what should have happened when we
649 popped the binding. */
652 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
653 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
656 /* Add it to the list of dead variables in the next
657 outermost binding to that we can remove these when we
658 leave that binding. */
659 current_binding_level->level_chain->dead_vars_from_for
660 = tree_cons (NULL_TREE, link,
661 current_binding_level->level_chain->
664 /* Although we don't pop the cxx_binding, we do clear
665 its SCOPE since the scope is going away now. */
666 IDENTIFIER_BINDING (name)->scope
667 = current_binding_level->level_chain;
674 /* Remove the binding. */
677 if (TREE_CODE (decl) == TREE_LIST)
678 decl = TREE_VALUE (decl);
681 if (TREE_CODE (name) == OVERLOAD)
682 name = OVL_FUNCTION (name);
684 gcc_assert (DECL_P (name));
685 pop_binding (DECL_NAME (name), decl);
689 /* Remove declarations for any `for' variables from inner scopes
690 that we kept around. */
691 for (link = current_binding_level->dead_vars_from_for;
692 link; link = TREE_CHAIN (link))
693 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
695 /* Restore the IDENTIFIER_TYPE_VALUEs. */
696 for (link = current_binding_level->type_shadowed;
697 link; link = TREE_CHAIN (link))
698 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
700 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
701 for (link = current_binding_level->shadowed_labels;
703 link = TREE_CHAIN (link))
704 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
706 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
707 list if a `using' declaration put them there. The debugging
708 back ends won't understand OVERLOAD, so we remove them here.
709 Because the BLOCK_VARS are (temporarily) shared with
710 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
711 popped all the bindings. */
716 for (d = &BLOCK_VARS (block); *d; )
718 if (TREE_CODE (*d) == TREE_LIST)
719 *d = TREE_CHAIN (*d);
721 d = &TREE_CHAIN (*d);
725 /* If the level being exited is the top level of a function,
726 check over all the labels. */
729 /* Since this is the top level block of a function, the vars are
730 the function's parameters. Don't leave them in the BLOCK
731 because they are found in the FUNCTION_DECL instead. */
732 BLOCK_VARS (block) = 0;
736 kind = current_binding_level->kind;
737 if (kind == sk_cleanup)
741 /* If this is a temporary binding created for a cleanup, then we'll
742 have pushed a statement list level. Pop that, create a new
743 BIND_EXPR for the block, and insert it into the stream. */
744 stmt = pop_stmt_list (current_binding_level->statement_list);
745 stmt = c_build_bind_expr (input_location, block, stmt);
752 /* The current function is being defined, so its DECL_INITIAL
753 should be error_mark_node. */
754 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
755 DECL_INITIAL (current_function_decl) = block;
758 current_binding_level->blocks
759 = chainon (current_binding_level->blocks, block);
761 /* If we did not make a block for the level just exited,
762 any blocks made for inner levels
763 (since they cannot be recorded as subblocks in that level)
764 must be carried forward so they will later become subblocks
765 of something else. */
767 current_binding_level->blocks
768 = chainon (current_binding_level->blocks, subblocks);
770 /* Each and every BLOCK node created here in `poplevel' is important
771 (e.g. for proper debugging information) so if we created one
772 earlier, mark it as "used". */
774 TREE_USED (block) = 1;
776 /* All temporary bindings created for cleanups are popped silently. */
777 if (kind == sk_cleanup)
780 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
783 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
784 itself, calling F for each. The DATA is passed to F as well. */
787 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
790 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
792 result |= (*f) (name_space, data);
794 for (; current; current = TREE_CHAIN (current))
795 result |= walk_namespaces_r (current, f, data);
800 /* Walk all the namespaces, calling F for each. The DATA is passed to
804 walk_namespaces (walk_namespaces_fn f, void* data)
806 return walk_namespaces_r (global_namespace, f, data);
809 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
810 DATA is non-NULL, this is the last time we will call
811 wrapup_global_declarations for this NAMESPACE. */
814 wrapup_globals_for_namespace (tree name_space, void* data)
816 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
817 VEC(tree,gc) *statics = level->static_decls;
818 tree *vec = VEC_address (tree, statics);
819 int len = VEC_length (tree, statics);
820 int last_time = (data != 0);
824 check_global_declarations (vec, len);
825 emit_debug_global_declarations (vec, len);
829 /* Write out any globals that need to be output. */
830 return wrapup_global_declarations (vec, len);
834 /* In C++, you don't have to write `struct S' to refer to `S'; you
835 can just use `S'. We accomplish this by creating a TYPE_DECL as
836 if the user had written `typedef struct S S'. Create and return
837 the TYPE_DECL for TYPE. */
840 create_implicit_typedef (tree name, tree type)
844 decl = build_decl (input_location, TYPE_DECL, name, type);
845 DECL_ARTIFICIAL (decl) = 1;
846 /* There are other implicit type declarations, like the one *within*
847 a class that allows you to write `S::S'. We must distinguish
849 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
850 TYPE_NAME (type) = decl;
851 TYPE_STUB_DECL (type) = decl;
856 /* Remember a local name for name-mangling purposes. */
859 push_local_name (tree decl)
864 timevar_push (TV_NAME_LOOKUP);
866 name = DECL_NAME (decl);
868 nelts = VEC_length (tree, local_names);
869 for (i = 0; i < nelts; i++)
871 t = VEC_index (tree, local_names, i);
872 if (DECL_NAME (t) == name)
874 if (!DECL_LANG_SPECIFIC (decl))
875 retrofit_lang_decl (decl);
876 DECL_LANG_SPECIFIC (decl)->u.base.u2sel = 1;
877 if (DECL_LANG_SPECIFIC (t))
878 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
880 DECL_DISCRIMINATOR (decl) = 1;
882 VEC_replace (tree, local_names, i, decl);
883 timevar_pop (TV_NAME_LOOKUP);
888 VEC_safe_push (tree, gc, local_names, decl);
889 timevar_pop (TV_NAME_LOOKUP);
892 /* Subroutine of duplicate_decls: return truthvalue of whether
893 or not types of these decls match.
895 For C++, we must compare the parameter list so that `int' can match
896 `int&' in a parameter position, but `int&' is not confused with
900 decls_match (tree newdecl, tree olddecl)
904 if (newdecl == olddecl)
907 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
908 /* If the two DECLs are not even the same kind of thing, we're not
909 interested in their types. */
912 if (TREE_CODE (newdecl) == FUNCTION_DECL)
914 tree f1 = TREE_TYPE (newdecl);
915 tree f2 = TREE_TYPE (olddecl);
916 tree p1 = TYPE_ARG_TYPES (f1);
917 tree p2 = TYPE_ARG_TYPES (f2);
919 /* Specializations of different templates are different functions
920 even if they have the same type. */
921 tree t1 = (DECL_USE_TEMPLATE (newdecl)
922 ? DECL_TI_TEMPLATE (newdecl)
924 tree t2 = (DECL_USE_TEMPLATE (olddecl)
925 ? DECL_TI_TEMPLATE (olddecl)
930 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
931 && ! (DECL_EXTERN_C_P (newdecl)
932 && DECL_EXTERN_C_P (olddecl)))
935 #ifdef NO_IMPLICIT_EXTERN_C
936 /* A new declaration doesn't match a built-in one unless it
937 is also extern "C". */
938 if (DECL_IS_BUILTIN (olddecl)
939 && DECL_EXTERN_C_P (olddecl) && !DECL_EXTERN_C_P (newdecl))
943 if (TREE_CODE (f1) != TREE_CODE (f2))
946 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
948 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
949 && (DECL_BUILT_IN (olddecl)
950 #ifndef NO_IMPLICIT_EXTERN_C
951 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
952 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
956 types_match = self_promoting_args_p (p1);
957 if (p1 == void_list_node)
958 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
960 #ifndef NO_IMPLICIT_EXTERN_C
961 else if (p1 == NULL_TREE
962 && (DECL_EXTERN_C_P (olddecl)
963 && DECL_IN_SYSTEM_HEADER (olddecl)
964 && !DECL_CLASS_SCOPE_P (olddecl))
965 && (DECL_EXTERN_C_P (newdecl)
966 && DECL_IN_SYSTEM_HEADER (newdecl)
967 && !DECL_CLASS_SCOPE_P (newdecl)))
969 types_match = self_promoting_args_p (p2);
970 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
974 types_match = compparms (p1, p2);
979 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
981 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
982 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
985 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
986 DECL_TEMPLATE_PARMS (olddecl)))
989 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
990 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
991 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
993 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
994 DECL_TEMPLATE_RESULT (newdecl));
998 /* Need to check scope for variable declaration (VAR_DECL).
999 For typedef (TYPE_DECL), scope is ignored. */
1000 if (TREE_CODE (newdecl) == VAR_DECL
1001 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1003 Two declarations for an object with C language linkage
1004 with the same name (ignoring the namespace that qualify
1005 it) that appear in different namespace scopes refer to
1007 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1010 if (TREE_TYPE (newdecl) == error_mark_node)
1011 types_match = TREE_TYPE (olddecl) == error_mark_node;
1012 else if (TREE_TYPE (olddecl) == NULL_TREE)
1013 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1014 else if (TREE_TYPE (newdecl) == NULL_TREE)
1017 types_match = comptypes (TREE_TYPE (newdecl),
1018 TREE_TYPE (olddecl),
1019 COMPARE_REDECLARATION);
1025 /* If NEWDECL is `static' and an `extern' was seen previously,
1026 warn about it. OLDDECL is the previous declaration.
1028 Note that this does not apply to the C++ case of declaring
1029 a variable `extern const' and then later `const'.
1031 Don't complain about built-in functions, since they are beyond
1032 the user's control. */
1035 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1037 if (TREE_CODE (newdecl) == TYPE_DECL
1038 || TREE_CODE (newdecl) == TEMPLATE_DECL
1039 || TREE_CODE (newdecl) == CONST_DECL
1040 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1043 /* Don't get confused by static member functions; that's a different
1045 if (TREE_CODE (newdecl) == FUNCTION_DECL
1046 && DECL_STATIC_FUNCTION_P (newdecl))
1049 /* If the old declaration was `static', or the new one isn't, then
1050 then everything is OK. */
1051 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1054 /* It's OK to declare a builtin function as `static'. */
1055 if (TREE_CODE (olddecl) == FUNCTION_DECL
1056 && DECL_ARTIFICIAL (olddecl))
1059 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1060 permerror (input_location, "previous declaration of %q+D", olddecl);
1063 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1064 function templates. If their exception specifications do not
1065 match, issue a diagnostic. */
1068 check_redeclaration_exception_specification (tree new_decl,
1073 tree new_exceptions;
1074 tree old_exceptions;
1076 new_type = TREE_TYPE (new_decl);
1077 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1078 old_type = TREE_TYPE (old_decl);
1079 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1083 If any declaration of a function has an exception-specification,
1084 all declarations, including the definition and an explicit
1085 specialization, of that function shall have an
1086 exception-specification with the same set of type-ids. */
1087 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1088 && ! DECL_IS_BUILTIN (old_decl)
1090 && !comp_except_specs (new_exceptions, old_exceptions,
1093 error ("declaration of %qF throws different exceptions", new_decl);
1094 error ("from previous declaration %q+F", old_decl);
1098 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1099 && lookup_attribute ("gnu_inline", \
1100 DECL_ATTRIBUTES (fn)))
1102 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1103 If the redeclaration is invalid, a diagnostic is issued, and the
1104 error_mark_node is returned. Otherwise, OLDDECL is returned.
1106 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1109 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1112 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1114 unsigned olddecl_uid = DECL_UID (olddecl);
1115 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1116 int new_defines_function = 0;
1117 tree new_template_info;
1119 if (newdecl == olddecl)
1122 types_match = decls_match (newdecl, olddecl);
1124 /* If either the type of the new decl or the type of the old decl is an
1125 error_mark_node, then that implies that we have already issued an
1126 error (earlier) for some bogus type specification, and in that case,
1127 it is rather pointless to harass the user with yet more error message
1128 about the same declaration, so just pretend the types match here. */
1129 if (TREE_TYPE (newdecl) == error_mark_node
1130 || TREE_TYPE (olddecl) == error_mark_node)
1131 return error_mark_node;
1133 if (DECL_P (olddecl)
1134 && TREE_CODE (newdecl) == FUNCTION_DECL
1135 && TREE_CODE (olddecl) == FUNCTION_DECL
1136 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1138 if (DECL_DECLARED_INLINE_P (newdecl)
1139 && DECL_UNINLINABLE (newdecl)
1140 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1141 /* Already warned elsewhere. */;
1142 else if (DECL_DECLARED_INLINE_P (olddecl)
1143 && DECL_UNINLINABLE (olddecl)
1144 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1145 /* Already warned. */;
1146 else if (DECL_DECLARED_INLINE_P (newdecl)
1147 && DECL_UNINLINABLE (olddecl)
1148 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1150 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1152 warning (OPT_Wattributes, "previous declaration of %q+D "
1153 "with attribute noinline", olddecl);
1155 else if (DECL_DECLARED_INLINE_P (olddecl)
1156 && DECL_UNINLINABLE (newdecl)
1157 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1159 warning (OPT_Wattributes, "function %q+D redeclared with "
1160 "attribute noinline", newdecl);
1161 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1166 /* Check for redeclaration and other discrepancies. */
1167 if (TREE_CODE (olddecl) == FUNCTION_DECL
1168 && DECL_ARTIFICIAL (olddecl))
1170 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1171 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1173 /* Avoid warnings redeclaring built-ins which have not been
1174 explicitly declared. */
1175 if (DECL_ANTICIPATED (olddecl))
1178 /* If you declare a built-in or predefined function name as static,
1179 the old definition is overridden, but optionally warn this was a
1180 bad choice of name. */
1181 if (! TREE_PUBLIC (newdecl))
1183 warning (OPT_Wshadow,
1184 DECL_BUILT_IN (olddecl)
1185 ? G_("shadowing built-in function %q#D")
1186 : G_("shadowing library function %q#D"), olddecl);
1187 /* Discard the old built-in function. */
1190 /* If the built-in is not ansi, then programs can override
1191 it even globally without an error. */
1192 else if (! DECL_BUILT_IN (olddecl))
1193 warning (0, "library function %q#D redeclared as non-function %q#D",
1197 error ("declaration of %q#D", newdecl);
1198 error ("conflicts with built-in declaration %q#D",
1203 else if (!types_match)
1205 /* Avoid warnings redeclaring built-ins which have not been
1206 explicitly declared. */
1207 if (DECL_ANTICIPATED (olddecl))
1209 /* Deal with fileptr_type_node. FILE type is not known
1210 at the time we create the builtins. */
1213 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1214 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1216 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1219 else if (TREE_VALUE (t2) == fileptr_type_node)
1221 tree t = TREE_VALUE (t1);
1223 if (TREE_CODE (t) == POINTER_TYPE
1224 && TYPE_NAME (TREE_TYPE (t))
1225 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1226 == get_identifier ("FILE")
1227 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1229 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1231 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1232 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1233 types_match = decls_match (newdecl, olddecl);
1235 return duplicate_decls (newdecl, olddecl,
1237 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1240 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1243 else if ((DECL_EXTERN_C_P (newdecl)
1244 && DECL_EXTERN_C_P (olddecl))
1245 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1246 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1248 /* A near match; override the builtin. */
1250 if (TREE_PUBLIC (newdecl))
1252 warning (0, "new declaration %q#D", newdecl);
1253 warning (0, "ambiguates built-in declaration %q#D",
1257 warning (OPT_Wshadow,
1258 DECL_BUILT_IN (olddecl)
1259 ? G_("shadowing built-in function %q#D")
1260 : G_("shadowing library function %q#D"), olddecl);
1263 /* Discard the old built-in function. */
1266 /* Replace the old RTL to avoid problems with inlining. */
1267 COPY_DECL_RTL (newdecl, olddecl);
1269 /* Even if the types match, prefer the new declarations type for
1270 built-ins which have not been explicitly declared, for
1271 exception lists, etc... */
1272 else if (DECL_ANTICIPATED (olddecl))
1274 tree type = TREE_TYPE (newdecl);
1275 tree attribs = (*targetm.merge_type_attributes)
1276 (TREE_TYPE (olddecl), type);
1278 type = cp_build_type_attribute_variant (type, attribs);
1279 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1282 /* If a function is explicitly declared "throw ()", propagate that to
1283 the corresponding builtin. */
1284 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1285 && DECL_ANTICIPATED (olddecl)
1286 && TREE_NOTHROW (newdecl)
1287 && !TREE_NOTHROW (olddecl)
1288 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1289 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1291 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1293 /* Whether or not the builtin can throw exceptions has no
1294 bearing on this declarator. */
1295 TREE_NOTHROW (olddecl) = 0;
1297 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1299 /* If a builtin function is redeclared as `static', merge
1300 the declarations, but make the original one static. */
1301 DECL_THIS_STATIC (olddecl) = 1;
1302 TREE_PUBLIC (olddecl) = 0;
1304 /* Make the old declaration consistent with the new one so
1305 that all remnants of the builtin-ness of this function
1306 will be banished. */
1307 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1308 COPY_DECL_RTL (newdecl, olddecl);
1311 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1313 /* C++ Standard, 3.3, clause 4:
1314 "[Note: a namespace name or a class template name must be unique
1315 in its declarative region (7.3.2, clause 14). ]" */
1316 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1317 && TREE_CODE (newdecl) != NAMESPACE_DECL
1318 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1319 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1320 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1321 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1323 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1324 && TREE_CODE (newdecl) != TYPE_DECL)
1325 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1326 && TREE_CODE (olddecl) != TYPE_DECL))
1328 /* We do nothing special here, because C++ does such nasty
1329 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1330 get shadowed, and know that if we need to find a TYPE_DECL
1331 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1332 slot of the identifier. */
1336 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1337 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1338 || (TREE_CODE (olddecl) == FUNCTION_DECL
1339 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1343 error ("%q#D redeclared as different kind of symbol", newdecl);
1344 if (TREE_CODE (olddecl) == TREE_LIST)
1345 olddecl = TREE_VALUE (olddecl);
1346 error ("previous declaration of %q+#D", olddecl);
1348 return error_mark_node;
1350 else if (!types_match)
1352 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1353 /* These are certainly not duplicate declarations; they're
1354 from different scopes. */
1357 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1359 /* The name of a class template may not be declared to refer to
1360 any other template, class, function, object, namespace, value,
1361 or type in the same scope. */
1362 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1363 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1365 error ("declaration of template %q#D", newdecl);
1366 error ("conflicts with previous declaration %q+#D", olddecl);
1368 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1369 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1370 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1371 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1372 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1373 DECL_TEMPLATE_PARMS (olddecl))
1374 /* Template functions can be disambiguated by
1376 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1377 TREE_TYPE (TREE_TYPE (olddecl))))
1379 error ("new declaration %q#D", newdecl);
1380 error ("ambiguates old declaration %q+#D", olddecl);
1384 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1386 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1388 error ("declaration of C function %q#D conflicts with",
1390 error ("previous declaration %q+#D here", olddecl);
1392 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1393 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1395 error ("new declaration %q#D", newdecl);
1396 error ("ambiguates old declaration %q+#D", olddecl);
1397 return error_mark_node;
1404 error ("conflicting declaration %q#D", newdecl);
1405 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1406 return error_mark_node;
1409 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1410 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1411 && (!DECL_TEMPLATE_INFO (newdecl)
1412 || (DECL_TI_TEMPLATE (newdecl)
1413 != DECL_TI_TEMPLATE (olddecl))))
1414 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1415 && (!DECL_TEMPLATE_INFO (olddecl)
1416 || (DECL_TI_TEMPLATE (olddecl)
1417 != DECL_TI_TEMPLATE (newdecl))))))
1418 /* It's OK to have a template specialization and a non-template
1419 with the same type, or to have specializations of two
1420 different templates with the same type. Note that if one is a
1421 specialization, and the other is an instantiation of the same
1422 template, that we do not exit at this point. That situation
1423 can occur if we instantiate a template class, and then
1424 specialize one of its methods. This situation is valid, but
1425 the declarations must be merged in the usual way. */
1427 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1428 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1429 && !DECL_USE_TEMPLATE (newdecl))
1430 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1431 && !DECL_USE_TEMPLATE (olddecl))))
1432 /* One of the declarations is a template instantiation, and the
1433 other is not a template at all. That's OK. */
1435 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1437 /* In [namespace.alias] we have:
1439 In a declarative region, a namespace-alias-definition can be
1440 used to redefine a namespace-alias declared in that declarative
1441 region to refer only to the namespace to which it already
1444 Therefore, if we encounter a second alias directive for the same
1445 alias, we can just ignore the second directive. */
1446 if (DECL_NAMESPACE_ALIAS (newdecl)
1447 && (DECL_NAMESPACE_ALIAS (newdecl)
1448 == DECL_NAMESPACE_ALIAS (olddecl)))
1450 /* [namespace.alias]
1452 A namespace-name or namespace-alias shall not be declared as
1453 the name of any other entity in the same declarative region.
1454 A namespace-name defined at global scope shall not be
1455 declared as the name of any other entity in any global scope
1457 error ("declaration of namespace %qD conflicts with", newdecl);
1458 error ("previous declaration of namespace %q+D here", olddecl);
1459 return error_mark_node;
1463 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1466 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1467 if (DECL_NAME (olddecl) != NULL_TREE)
1468 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1469 ? "%q+#D previously defined here"
1470 : "%q+#D previously declared here", olddecl);
1471 return error_mark_node;
1473 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1474 && DECL_INITIAL (olddecl) != NULL_TREE
1475 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1476 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1478 /* Prototype decl follows defn w/o prototype. */
1479 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1480 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1481 "follows non-prototype definition here");
1483 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1484 || TREE_CODE (olddecl) == VAR_DECL)
1485 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1488 If two declarations of the same function or object
1489 specify different linkage-specifications ..., the program
1490 is ill-formed.... Except for functions with C++ linkage,
1491 a function declaration without a linkage specification
1492 shall not precede the first linkage specification for
1493 that function. A function can be declared without a
1494 linkage specification after an explicit linkage
1495 specification has been seen; the linkage explicitly
1496 specified in the earlier declaration is not affected by
1497 such a function declaration.
1499 DR 563 raises the question why the restrictions on
1500 functions should not also apply to objects. Older
1501 versions of G++ silently ignore the linkage-specification
1509 which is clearly wrong. Therefore, we now treat objects
1511 if (current_lang_depth () == 0)
1513 /* There is no explicit linkage-specification, so we use
1514 the linkage from the previous declaration. */
1515 if (!DECL_LANG_SPECIFIC (newdecl))
1516 retrofit_lang_decl (newdecl);
1517 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1521 error ("previous declaration of %q+#D with %qL linkage",
1522 olddecl, DECL_LANGUAGE (olddecl));
1523 error ("conflicts with new declaration with %qL linkage",
1524 DECL_LANGUAGE (newdecl));
1528 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1530 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1532 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1533 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1536 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1537 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1539 for (; t1 && t1 != void_list_node;
1540 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1541 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1543 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1546 permerror (input_location, "default argument given for parameter %d of %q#D",
1548 permerror (input_location, "after previous specification in %q+#D", olddecl);
1552 error ("default argument given for parameter %d of %q#D",
1554 error ("after previous specification in %q+#D",
1561 /* Do not merge an implicit typedef with an explicit one. In:
1565 typedef class A A __attribute__ ((foo));
1567 the attribute should apply only to the typedef. */
1568 if (TREE_CODE (olddecl) == TYPE_DECL
1569 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1570 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1573 /* If new decl is `static' and an `extern' was seen previously,
1575 warn_extern_redeclared_static (newdecl, olddecl);
1577 /* We have committed to returning 1 at this point. */
1578 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1580 /* Now that functions must hold information normally held
1581 by field decls, there is extra work to do so that
1582 declaration information does not get destroyed during
1584 if (DECL_VINDEX (olddecl))
1585 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1586 if (DECL_CONTEXT (olddecl))
1587 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1588 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1589 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1590 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1591 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1592 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1593 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1594 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1595 SET_OVERLOADED_OPERATOR_CODE
1596 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1597 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1599 /* Optionally warn about more than one declaration for the same
1600 name, but don't warn about a function declaration followed by a
1602 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1603 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1604 /* Don't warn about extern decl followed by definition. */
1605 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1606 /* Don't warn about friends, let add_friend take care of it. */
1607 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1609 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1610 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1613 if (DECL_DELETED_FN (newdecl))
1615 error ("deleted definition of %qD", newdecl);
1616 error ("after previous declaration %q+D", olddecl);
1620 /* Deal with C++: must preserve virtual function table size. */
1621 if (TREE_CODE (olddecl) == TYPE_DECL)
1623 tree newtype = TREE_TYPE (newdecl);
1624 tree oldtype = TREE_TYPE (olddecl);
1626 if (newtype != error_mark_node && oldtype != error_mark_node
1627 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1628 CLASSTYPE_FRIEND_CLASSES (newtype)
1629 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1631 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1634 /* Copy all the DECL_... slots specified in the new decl
1635 except for any that we copy here from the old type. */
1636 DECL_ATTRIBUTES (newdecl)
1637 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1639 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1643 old_result = DECL_TEMPLATE_RESULT (olddecl);
1644 new_result = DECL_TEMPLATE_RESULT (newdecl);
1645 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1646 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1647 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1648 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1650 DECL_ATTRIBUTES (old_result)
1651 = (*targetm.merge_decl_attributes) (old_result, new_result);
1653 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1655 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1656 && DECL_INITIAL (new_result))
1658 if (DECL_INITIAL (old_result))
1659 DECL_UNINLINABLE (old_result) = 1;
1661 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1662 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1663 DECL_NOT_REALLY_EXTERN (old_result)
1664 = DECL_NOT_REALLY_EXTERN (new_result);
1665 DECL_INTERFACE_KNOWN (old_result)
1666 = DECL_INTERFACE_KNOWN (new_result);
1667 DECL_DECLARED_INLINE_P (old_result)
1668 = DECL_DECLARED_INLINE_P (new_result);
1669 DECL_DISREGARD_INLINE_LIMITS (old_result)
1670 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1675 DECL_DECLARED_INLINE_P (old_result)
1676 |= DECL_DECLARED_INLINE_P (new_result);
1677 DECL_DISREGARD_INLINE_LIMITS (old_result)
1678 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1679 check_redeclaration_exception_specification (newdecl, olddecl);
1683 /* If the new declaration is a definition, update the file and
1684 line information on the declaration, and also make
1685 the old declaration the same definition. */
1686 if (DECL_INITIAL (new_result) != NULL_TREE)
1688 DECL_SOURCE_LOCATION (olddecl)
1689 = DECL_SOURCE_LOCATION (old_result)
1690 = DECL_SOURCE_LOCATION (newdecl);
1691 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1692 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1695 DECL_ARGUMENTS (old_result)
1696 = DECL_ARGUMENTS (new_result);
1697 for (parm = DECL_ARGUMENTS (old_result); parm;
1698 parm = TREE_CHAIN (parm))
1699 DECL_CONTEXT (parm) = old_result;
1708 /* Automatically handles default parameters. */
1709 tree oldtype = TREE_TYPE (olddecl);
1712 /* Merge the data types specified in the two decls. */
1713 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1715 /* If merge_types produces a non-typedef type, just use the old type. */
1716 if (TREE_CODE (newdecl) == TYPE_DECL
1717 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1720 if (TREE_CODE (newdecl) == VAR_DECL)
1722 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1723 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1724 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1725 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1726 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1727 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1729 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1730 if (DECL_LANG_SPECIFIC (olddecl)
1731 && CP_DECL_THREADPRIVATE_P (olddecl))
1733 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1734 if (!DECL_LANG_SPECIFIC (newdecl))
1735 retrofit_lang_decl (newdecl);
1737 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1738 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1742 /* Do this after calling `merge_types' so that default
1743 parameters don't confuse us. */
1744 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1745 check_redeclaration_exception_specification (newdecl, olddecl);
1746 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1748 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1749 check_default_args (newdecl);
1751 /* Lay the type out, unless already done. */
1752 if (! same_type_p (newtype, oldtype)
1753 && TREE_TYPE (newdecl) != error_mark_node
1754 && !(processing_template_decl && uses_template_parms (newdecl)))
1755 layout_type (TREE_TYPE (newdecl));
1757 if ((TREE_CODE (newdecl) == VAR_DECL
1758 || TREE_CODE (newdecl) == PARM_DECL
1759 || TREE_CODE (newdecl) == RESULT_DECL
1760 || TREE_CODE (newdecl) == FIELD_DECL
1761 || TREE_CODE (newdecl) == TYPE_DECL)
1762 && !(processing_template_decl && uses_template_parms (newdecl)))
1763 layout_decl (newdecl, 0);
1765 /* Merge the type qualifiers. */
1766 if (TREE_READONLY (newdecl))
1767 TREE_READONLY (olddecl) = 1;
1768 if (TREE_THIS_VOLATILE (newdecl))
1769 TREE_THIS_VOLATILE (olddecl) = 1;
1770 if (TREE_NOTHROW (newdecl))
1771 TREE_NOTHROW (olddecl) = 1;
1773 /* Merge deprecatedness. */
1774 if (TREE_DEPRECATED (newdecl))
1775 TREE_DEPRECATED (olddecl) = 1;
1777 /* Preserve function specific target and optimization options */
1778 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1780 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1781 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1782 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1783 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1785 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1786 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1787 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1788 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1791 /* Merge the initialization information. */
1792 if (DECL_INITIAL (newdecl) == NULL_TREE
1793 && DECL_INITIAL (olddecl) != NULL_TREE)
1795 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1796 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1797 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1799 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1800 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1804 /* Merge the section attribute.
1805 We want to issue an error if the sections conflict but that must be
1806 done later in decl_attributes since we are called before attributes
1808 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1809 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1811 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1813 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1814 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1815 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1816 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1817 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1818 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1819 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1820 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1821 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1822 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1823 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1824 /* Keep the old RTL. */
1825 COPY_DECL_RTL (olddecl, newdecl);
1827 else if (TREE_CODE (newdecl) == VAR_DECL
1828 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1830 /* Keep the old RTL. We cannot keep the old RTL if the old
1831 declaration was for an incomplete object and the new
1832 declaration is not since many attributes of the RTL will
1834 COPY_DECL_RTL (olddecl, newdecl);
1837 /* If cannot merge, then use the new type and qualifiers,
1838 and don't preserve the old rtl. */
1841 /* Clean out any memory we had of the old declaration. */
1842 tree oldstatic = value_member (olddecl, static_aggregates);
1844 TREE_VALUE (oldstatic) = error_mark_node;
1846 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1847 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1848 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1849 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1852 /* Merge the storage class information. */
1853 merge_weak (newdecl, olddecl);
1855 if (DECL_ONE_ONLY (olddecl))
1856 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1858 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1859 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1860 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1861 if (! DECL_EXTERNAL (olddecl))
1862 DECL_EXTERNAL (newdecl) = 0;
1864 new_template_info = NULL_TREE;
1865 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1867 bool new_redefines_gnu_inline = false;
1869 if (new_defines_function
1870 && ((DECL_INTERFACE_KNOWN (olddecl)
1871 && TREE_CODE (olddecl) == FUNCTION_DECL)
1872 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1873 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1874 == FUNCTION_DECL))))
1878 if (TREE_CODE (fn) == TEMPLATE_DECL)
1879 fn = DECL_TEMPLATE_RESULT (olddecl);
1881 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1884 if (!new_redefines_gnu_inline)
1886 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1887 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1888 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1890 DECL_TEMPLATE_INSTANTIATED (newdecl)
1891 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1892 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1894 /* If the OLDDECL is an instantiation and/or specialization,
1895 then the NEWDECL must be too. But, it may not yet be marked
1896 as such if the caller has created NEWDECL, but has not yet
1897 figured out that it is a redeclaration. */
1898 if (!DECL_USE_TEMPLATE (newdecl))
1899 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1901 /* Don't really know how much of the language-specific
1902 values we should copy from old to new. */
1903 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1904 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1905 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1906 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1908 if (LANG_DECL_HAS_MIN (newdecl))
1910 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1911 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1912 if (DECL_TEMPLATE_INFO (newdecl))
1913 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1914 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1916 /* Only functions have these fields. */
1917 if (TREE_CODE (newdecl) == FUNCTION_DECL
1918 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1920 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1921 olddecl_friend = DECL_FRIEND_P (olddecl);
1922 hidden_friend = (DECL_ANTICIPATED (olddecl)
1923 && DECL_HIDDEN_FRIEND_P (olddecl)
1924 && newdecl_is_friend);
1925 DECL_BEFRIENDING_CLASSES (newdecl)
1926 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1927 DECL_BEFRIENDING_CLASSES (olddecl));
1928 /* DECL_THUNKS is only valid for virtual functions,
1929 otherwise it is a DECL_FRIEND_CONTEXT. */
1930 if (DECL_VIRTUAL_P (newdecl))
1931 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1935 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1939 /* Merge parameter attributes. */
1940 tree oldarg, newarg;
1941 for (oldarg = DECL_ARGUMENTS(olddecl),
1942 newarg = DECL_ARGUMENTS(newdecl);
1944 oldarg = TREE_CHAIN(oldarg), newarg = TREE_CHAIN(newarg)) {
1945 DECL_ATTRIBUTES (newarg)
1946 = (*targetm.merge_decl_attributes) (oldarg, newarg);
1947 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
1950 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1951 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1953 /* If newdecl is not a specialization, then it is not a
1954 template-related function at all. And that means that we
1955 should have exited above, returning 0. */
1956 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1958 if (DECL_ODR_USED (olddecl))
1959 /* From [temp.expl.spec]:
1961 If a template, a member template or the member of a class
1962 template is explicitly specialized then that
1963 specialization shall be declared before the first use of
1964 that specialization that would cause an implicit
1965 instantiation to take place, in every translation unit in
1966 which such a use occurs. */
1967 error ("explicit specialization of %qD after first use",
1970 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1972 /* Don't propagate visibility from the template to the
1973 specialization here. We'll do that in determine_visibility if
1975 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1977 /* [temp.expl.spec/14] We don't inline explicit specialization
1978 just because the primary template says so. */
1980 else if (new_defines_function && DECL_INITIAL (olddecl))
1982 /* Never inline re-defined extern inline functions.
1983 FIXME: this could be better handled by keeping both
1984 function as separate declarations. */
1985 DECL_UNINLINABLE (newdecl) = 1;
1989 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1990 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1992 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1994 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1995 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1997 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1998 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1999 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
2000 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2003 /* Preserve abstractness on cloned [cd]tors. */
2004 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2006 /* Update newdecl's parms to point at olddecl. */
2007 for (parm = DECL_ARGUMENTS (newdecl); parm;
2008 parm = TREE_CHAIN (parm))
2009 DECL_CONTEXT (parm) = olddecl;
2013 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2014 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2015 COPY_DECL_RTL (newdecl, olddecl);
2017 if (! types_match || new_defines_function)
2019 /* These need to be copied so that the names are available.
2020 Note that if the types do match, we'll preserve inline
2021 info and other bits, but if not, we won't. */
2022 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2023 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2025 if (new_defines_function)
2026 /* If defining a function declared with other language
2027 linkage, use the previously declared language linkage. */
2028 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2029 else if (types_match)
2031 /* If redeclaring a builtin function, and not a definition,
2032 it stays built in. */
2033 if (DECL_BUILT_IN (olddecl))
2035 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2036 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2037 /* If we're keeping the built-in definition, keep the rtl,
2038 regardless of declaration matches. */
2039 COPY_DECL_RTL (olddecl, newdecl);
2042 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2043 /* Don't clear out the arguments if we're just redeclaring a
2045 if (DECL_ARGUMENTS (olddecl))
2046 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2049 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2050 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2052 /* Now preserve various other info from the definition. */
2053 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2054 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2055 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2056 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2058 /* Warn about conflicting visibility specifications. */
2059 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2060 && DECL_VISIBILITY_SPECIFIED (newdecl)
2061 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2063 warning_at (input_location, OPT_Wattributes,
2064 "%q+D: visibility attribute ignored because it", newdecl);
2065 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2066 "conflicts with previous declaration here");
2068 /* Choose the declaration which specified visibility. */
2069 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2071 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2072 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2074 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2075 so keep this behavior. */
2076 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2078 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2079 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2082 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2083 with that from NEWDECL below. */
2084 if (DECL_LANG_SPECIFIC (olddecl))
2086 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2087 != DECL_LANG_SPECIFIC (newdecl));
2088 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2091 /* Merge the USED information. */
2092 if (TREE_USED (olddecl))
2093 TREE_USED (newdecl) = 1;
2094 else if (TREE_USED (newdecl))
2095 TREE_USED (olddecl) = 1;
2097 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2101 function_size = sizeof (struct tree_decl_common);
2103 memcpy ((char *) olddecl + sizeof (struct tree_common),
2104 (char *) newdecl + sizeof (struct tree_common),
2105 function_size - sizeof (struct tree_common));
2107 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2108 (char *) newdecl + sizeof (struct tree_decl_common),
2109 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2110 if (new_template_info)
2111 /* If newdecl is a template instantiation, it is possible that
2112 the following sequence of events has occurred:
2114 o A friend function was declared in a class template. The
2115 class template was instantiated.
2117 o The instantiation of the friend declaration was
2118 recorded on the instantiation list, and is newdecl.
2120 o Later, however, instantiate_class_template called pushdecl
2121 on the newdecl to perform name injection. But, pushdecl in
2122 turn called duplicate_decls when it discovered that another
2123 declaration of a global function with the same name already
2126 o Here, in duplicate_decls, we decided to clobber newdecl.
2128 If we're going to do that, we'd better make sure that
2129 olddecl, and not newdecl, is on the list of
2130 instantiations so that if we try to do the instantiation
2131 again we won't get the clobbered declaration. */
2132 reregister_specialization (newdecl,
2138 size_t size = tree_code_size (TREE_CODE (olddecl));
2139 memcpy ((char *) olddecl + sizeof (struct tree_common),
2140 (char *) newdecl + sizeof (struct tree_common),
2141 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2142 switch (TREE_CODE (olddecl))
2152 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2153 (char *) newdecl + sizeof (struct tree_decl_common),
2154 size - sizeof (struct tree_decl_common)
2155 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2159 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2160 (char *) newdecl + sizeof (struct tree_decl_common),
2161 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2162 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2166 DECL_UID (olddecl) = olddecl_uid;
2168 DECL_FRIEND_P (olddecl) = 1;
2171 DECL_ANTICIPATED (olddecl) = 1;
2172 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2175 /* NEWDECL contains the merged attribute lists.
2176 Update OLDDECL to be the same. */
2177 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2179 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2180 so that encode_section_info has a chance to look at the new decl
2181 flags and attributes. */
2182 if (DECL_RTL_SET_P (olddecl)
2183 && (TREE_CODE (olddecl) == FUNCTION_DECL
2184 || (TREE_CODE (olddecl) == VAR_DECL
2185 && TREE_STATIC (olddecl))))
2186 make_decl_rtl (olddecl);
2188 /* The NEWDECL will no longer be needed. Because every out-of-class
2189 declaration of a member results in a call to duplicate_decls,
2190 freeing these nodes represents in a significant savings. */
2196 /* Return zero if the declaration NEWDECL is valid
2197 when the declaration OLDDECL (assumed to be for the same name)
2198 has already been seen.
2199 Otherwise return an error message format string with a %s
2200 where the identifier should go. */
2203 redeclaration_error_message (tree newdecl, tree olddecl)
2205 if (TREE_CODE (newdecl) == TYPE_DECL)
2207 /* Because C++ can put things into name space for free,
2208 constructs like "typedef struct foo { ... } foo"
2209 would look like an erroneous redeclaration. */
2210 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2213 return G_("redefinition of %q#D");
2215 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2217 /* If this is a pure function, its olddecl will actually be
2218 the original initialization to `0' (which we force to call
2219 abort()). Don't complain about redefinition in this case. */
2220 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2221 && DECL_INITIAL (olddecl) == NULL_TREE)
2224 /* If both functions come from different namespaces, this is not
2225 a redeclaration - this is a conflict with a used function. */
2226 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2227 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2228 && ! decls_match (olddecl, newdecl))
2229 return G_("%qD conflicts with used function");
2231 /* We'll complain about linkage mismatches in
2232 warn_extern_redeclared_static. */
2234 /* Defining the same name twice is no good. */
2235 if (DECL_INITIAL (olddecl) != NULL_TREE
2236 && DECL_INITIAL (newdecl) != NULL_TREE)
2238 if (DECL_NAME (olddecl) == NULL_TREE)
2239 return G_("%q#D not declared in class");
2240 else if (!GNU_INLINE_P (olddecl)
2241 || GNU_INLINE_P (newdecl))
2242 return G_("redefinition of %q#D");
2245 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2247 bool olda = GNU_INLINE_P (olddecl);
2248 bool newa = GNU_INLINE_P (newdecl);
2253 return G_("%q+D redeclared inline with "
2254 "%<gnu_inline%> attribute");
2256 return G_("%q+D redeclared inline without "
2257 "%<gnu_inline%> attribute");
2263 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2267 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2269 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2270 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2271 return G_("redefinition of %q#D");
2275 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2276 || (DECL_TEMPLATE_RESULT (newdecl)
2277 == DECL_TEMPLATE_RESULT (olddecl)))
2280 nt = DECL_TEMPLATE_RESULT (newdecl);
2281 if (DECL_TEMPLATE_INFO (nt))
2282 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2283 ot = DECL_TEMPLATE_RESULT (olddecl);
2284 if (DECL_TEMPLATE_INFO (ot))
2285 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2286 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2287 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2288 return G_("redefinition of %q#D");
2290 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2292 bool olda = GNU_INLINE_P (ot);
2293 bool newa = GNU_INLINE_P (nt);
2298 return G_("%q+D redeclared inline with "
2299 "%<gnu_inline%> attribute");
2301 return G_("%q+D redeclared inline without "
2302 "%<gnu_inline%> attribute");
2306 /* Core issue #226 (C++0x):
2308 If a friend function template declaration specifies a
2309 default template-argument, that declaration shall be a
2310 definition and shall be the only declaration of the
2311 function template in the translation unit. */
2312 if ((cxx_dialect != cxx98)
2313 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2314 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2315 /*is_primary=*/1, /*is_partial=*/0,
2316 /*is_friend_decl=*/2))
2317 return G_("redeclaration of friend %q#D "
2318 "may not have default template arguments");
2322 else if (TREE_CODE (newdecl) == VAR_DECL
2323 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2324 && (! DECL_LANG_SPECIFIC (olddecl)
2325 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2326 || DECL_THREAD_LOCAL_P (newdecl)))
2328 /* Only variables can be thread-local, and all declarations must
2329 agree on this property. */
2330 if (DECL_THREAD_LOCAL_P (newdecl))
2331 return G_("thread-local declaration of %q#D follows "
2332 "non-thread-local declaration");
2334 return G_("non-thread-local declaration of %q#D follows "
2335 "thread-local declaration");
2337 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2339 /* The objects have been declared at namespace scope. If either
2340 is a member of an anonymous union, then this is an invalid
2341 redeclaration. For example:
2347 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2348 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2349 return G_("redeclaration of %q#D");
2350 /* If at least one declaration is a reference, there is no
2351 conflict. For example:
2357 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2359 /* Reject two definitions. */
2360 return G_("redefinition of %q#D");
2364 /* Objects declared with block scope: */
2365 /* Reject two definitions, and reject a definition
2366 together with an external reference. */
2367 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2368 return G_("redeclaration of %q#D");
2373 /* Hash and equality functions for the named_label table. */
2376 named_label_entry_hash (const void *data)
2378 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2379 return DECL_UID (ent->label_decl);
2383 named_label_entry_eq (const void *a, const void *b)
2385 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2386 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2387 return ent_a->label_decl == ent_b->label_decl;
2390 /* Create a new label, named ID. */
2393 make_label_decl (tree id, int local_p)
2395 struct named_label_entry *ent;
2399 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2401 DECL_CONTEXT (decl) = current_function_decl;
2402 DECL_MODE (decl) = VOIDmode;
2403 C_DECLARED_LABEL_FLAG (decl) = local_p;
2405 /* Say where one reference is to the label, for the sake of the
2406 error if it is not defined. */
2407 DECL_SOURCE_LOCATION (decl) = input_location;
2409 /* Record the fact that this identifier is bound to this label. */
2410 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2412 /* Create the label htab for the function on demand. */
2414 named_labels = htab_create_ggc (13, named_label_entry_hash,
2415 named_label_entry_eq, NULL);
2417 /* Record this label on the list of labels used in this function.
2418 We do this before calling make_label_decl so that we get the
2419 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2420 ent = GGC_CNEW (struct named_label_entry);
2421 ent->label_decl = decl;
2423 slot = htab_find_slot (named_labels, ent, INSERT);
2424 gcc_assert (*slot == NULL);
2430 /* Look for a label named ID in the current function. If one cannot
2431 be found, create one. (We keep track of used, but undefined,
2432 labels, and complain about them at the end of a function.) */
2435 lookup_label (tree id)
2439 timevar_push (TV_NAME_LOOKUP);
2440 /* You can't use labels at global scope. */
2441 if (current_function_decl == NULL_TREE)
2443 error ("label %qE referenced outside of any function", id);
2444 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2447 /* See if we've already got this label. */
2448 decl = IDENTIFIER_LABEL_VALUE (id);
2449 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2450 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2452 decl = make_label_decl (id, /*local_p=*/0);
2453 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2456 /* Declare a local label named ID. */
2459 declare_local_label (tree id)
2463 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2464 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2465 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2466 current_binding_level->shadowed_labels);
2467 current_binding_level->shadowed_labels = shadow;
2469 decl = make_label_decl (id, /*local_p=*/1);
2470 TREE_VALUE (shadow) = decl;
2475 /* Returns nonzero if it is ill-formed to jump past the declaration of
2476 DECL. Returns 2 if it's also a real problem. */
2479 decl_jump_unsafe (tree decl)
2481 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2482 with automatic storage duration is not in scope to a point where it is
2483 in scope is ill-formed unless the variable has scalar type, class type
2484 with a trivial default constructor and a trivial destructor, a
2485 cv-qualified version of one of these types, or an array of one of the
2486 preceding types and is declared without an initializer (8.5). */
2487 tree type = TREE_TYPE (decl);
2489 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2490 || type == error_mark_node)
2493 type = strip_array_types (type);
2495 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2496 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2499 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2505 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2508 identify_goto (tree decl, const location_t *locus)
2511 permerror (input_location, "jump to label %qD", decl);
2513 permerror (input_location, "jump to case label");
2515 permerror (*locus, " from here");
2518 /* Check that a single previously seen jump to a newly defined label
2519 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2520 the jump context; NAMES are the names in scope in LEVEL at the jump
2521 context; LOCUS is the source position of the jump or 0. Returns
2522 true if all is well. */
2525 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2526 bool exited_omp, const location_t *locus)
2528 struct cp_binding_level *b;
2529 bool identified = false, saw_eh = false, saw_omp = false;
2533 identify_goto (decl, locus);
2534 error (" exits OpenMP structured block");
2535 identified = saw_omp = true;
2538 for (b = current_binding_level; b ; b = b->level_chain)
2540 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2542 for (new_decls = b->names; new_decls != old_decls;
2543 new_decls = TREE_CHAIN (new_decls))
2545 int problem = decl_jump_unsafe (new_decls);
2551 identify_goto (decl, locus);
2555 error (" crosses initialization of %q+#D", new_decls);
2557 permerror (input_location, " enters scope of %q+#D which has "
2558 "non-trivial destructor", new_decls);
2563 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2567 identify_goto (decl, locus);
2570 if (b->kind == sk_try)
2571 error (" enters try block");
2573 error (" enters catch block");
2576 if (b->kind == sk_omp && !saw_omp)
2580 identify_goto (decl, locus);
2583 error (" enters OpenMP structured block");
2592 check_previous_goto (tree decl, struct named_label_use_entry *use)
2594 check_previous_goto_1 (decl, use->binding_level,
2595 use->names_in_scope, use->in_omp_scope,
2596 &use->o_goto_locus);
2600 check_switch_goto (struct cp_binding_level* level)
2602 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2605 /* Check that a new jump to a label DECL is OK. Called by
2606 finish_goto_stmt. */
2609 check_goto (tree decl)
2611 struct named_label_entry *ent, dummy;
2612 bool saw_catch = false, identified = false;
2615 /* We can't know where a computed goto is jumping.
2616 So we assume that it's OK. */
2617 if (TREE_CODE (decl) != LABEL_DECL)
2620 /* We didn't record any information about this label when we created it,
2621 and there's not much point since it's trivial to analyze as a return. */
2622 if (decl == cdtor_label)
2625 dummy.label_decl = decl;
2626 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2627 gcc_assert (ent != NULL);
2629 /* If the label hasn't been defined yet, defer checking. */
2630 if (! DECL_INITIAL (decl))
2632 struct named_label_use_entry *new_use;
2634 /* Don't bother creating another use if the last goto had the
2635 same data, and will therefore create the same set of errors. */
2637 && ent->uses->names_in_scope == current_binding_level->names)
2640 new_use = GGC_NEW (struct named_label_use_entry);
2641 new_use->binding_level = current_binding_level;
2642 new_use->names_in_scope = current_binding_level->names;
2643 new_use->o_goto_locus = input_location;
2644 new_use->in_omp_scope = false;
2646 new_use->next = ent->uses;
2647 ent->uses = new_use;
2651 if (ent->in_try_scope || ent->in_catch_scope
2652 || ent->in_omp_scope || ent->bad_decls)
2654 permerror (input_location, "jump to label %q+D", decl);
2655 permerror (input_location, " from here");
2659 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2661 tree b = TREE_VALUE (bad);
2662 int u = decl_jump_unsafe (b);
2664 if (u > 1 && DECL_ARTIFICIAL (b))
2666 /* Can't skip init of __exception_info. */
2667 error_at (DECL_SOURCE_LOCATION (b), " enters catch block");
2671 error (" skips initialization of %q+#D", b);
2673 permerror (input_location, " enters scope of %q+#D which has "
2674 "non-trivial destructor", b);
2677 if (ent->in_try_scope)
2678 error (" enters try block");
2679 else if (ent->in_catch_scope && !saw_catch)
2680 error (" enters catch block");
2682 if (ent->in_omp_scope)
2683 error (" enters OpenMP structured block");
2684 else if (flag_openmp)
2686 struct cp_binding_level *b;
2687 for (b = current_binding_level; b ; b = b->level_chain)
2689 if (b == ent->binding_level)
2691 if (b->kind == sk_omp)
2695 permerror (input_location, "jump to label %q+D", decl);
2696 permerror (input_location, " from here");
2699 error (" exits OpenMP structured block");
2706 /* Check that a return is ok wrt OpenMP structured blocks.
2707 Called by finish_return_stmt. Returns true if all is well. */
2710 check_omp_return (void)
2712 struct cp_binding_level *b;
2713 for (b = current_binding_level; b ; b = b->level_chain)
2714 if (b->kind == sk_omp)
2716 error ("invalid exit from OpenMP structured block");
2722 /* Define a label, specifying the location in the source file.
2723 Return the LABEL_DECL node for the label. */
2726 define_label (location_t location, tree name)
2728 struct named_label_entry *ent, dummy;
2729 struct cp_binding_level *p;
2732 timevar_push (TV_NAME_LOOKUP);
2734 decl = lookup_label (name);
2736 dummy.label_decl = decl;
2737 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2738 gcc_assert (ent != NULL);
2740 /* After labels, make any new cleanups in the function go into their
2741 own new (temporary) binding contour. */
2742 for (p = current_binding_level;
2743 p->kind != sk_function_parms;
2745 p->more_cleanups_ok = 0;
2747 if (name == get_identifier ("wchar_t"))
2748 permerror (input_location, "label named wchar_t");
2750 if (DECL_INITIAL (decl) != NULL_TREE)
2752 error ("duplicate label %qD", decl);
2753 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2757 struct named_label_use_entry *use;
2759 /* Mark label as having been defined. */
2760 DECL_INITIAL (decl) = error_mark_node;
2761 /* Say where in the source. */
2762 DECL_SOURCE_LOCATION (decl) = location;
2764 ent->binding_level = current_binding_level;
2765 ent->names_in_scope = current_binding_level->names;
2767 for (use = ent->uses; use ; use = use->next)
2768 check_previous_goto (decl, use);
2772 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2777 struct cp_binding_level *level;
2778 struct cp_switch *next;
2779 /* The SWITCH_STMT being built. */
2781 /* A splay-tree mapping the low element of a case range to the high
2782 element, or NULL_TREE if there is no high element. Used to
2783 determine whether or not a new case label duplicates an old case
2784 label. We need a tree, rather than simply a hash table, because
2785 of the GNU case range extension. */
2789 /* A stack of the currently active switch statements. The innermost
2790 switch statement is on the top of the stack. There is no need to
2791 mark the stack for garbage collection because it is only active
2792 during the processing of the body of a function, and we never
2793 collect at that point. */
2795 static struct cp_switch *switch_stack;
2797 /* Called right after a switch-statement condition is parsed.
2798 SWITCH_STMT is the switch statement being parsed. */
2801 push_switch (tree switch_stmt)
2803 struct cp_switch *p = XNEW (struct cp_switch);
2804 p->level = current_binding_level;
2805 p->next = switch_stack;
2806 p->switch_stmt = switch_stmt;
2807 p->cases = splay_tree_new (case_compare, NULL, NULL);
2814 struct cp_switch *cs = switch_stack;
2815 location_t switch_location;
2817 /* Emit warnings as needed. */
2818 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2819 switch_location = EXPR_LOCATION (cs->switch_stmt);
2821 switch_location = input_location;
2822 if (!processing_template_decl)
2823 c_do_switch_warnings (cs->cases, switch_location,
2824 SWITCH_STMT_TYPE (cs->switch_stmt),
2825 SWITCH_STMT_COND (cs->switch_stmt));
2827 splay_tree_delete (cs->cases);
2828 switch_stack = switch_stack->next;
2832 /* Note that we've seen a definition of a case label, and complain if this
2833 is a bad place for one. */
2836 finish_case_label (location_t loc, tree low_value, tree high_value)
2839 struct cp_binding_level *p;
2841 if (processing_template_decl)
2845 /* For templates, just add the case label; we'll do semantic
2846 analysis at instantiation-time. */
2847 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2848 return add_stmt (build_case_label (loc, low_value, high_value, label));
2851 /* Find the condition on which this switch statement depends. */
2852 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2853 if (cond && TREE_CODE (cond) == TREE_LIST)
2854 cond = TREE_VALUE (cond);
2856 if (!check_switch_goto (switch_stack->level))
2857 return error_mark_node;
2859 r = c_add_case_label (loc, switch_stack->cases, cond,
2860 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2861 low_value, high_value);
2863 /* After labels, make any new cleanups in the function go into their
2864 own new (temporary) binding contour. */
2865 for (p = current_binding_level;
2866 p->kind != sk_function_parms;
2868 p->more_cleanups_ok = 0;
2873 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2876 typename_hash (const void* k)
2879 const_tree const t = (const_tree) k;
2881 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2882 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2887 typedef struct typename_info {
2895 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2896 really of type `typename_info*' */
2899 typename_compare (const void * k1, const void * k2)
2901 const_tree const t1 = (const_tree) k1;
2902 const typename_info *const t2 = (const typename_info *) k2;
2904 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2905 && TYPE_CONTEXT (t1) == t2->scope
2906 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2907 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2908 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2911 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2912 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2914 Returns the new TYPENAME_TYPE. */
2916 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2919 build_typename_type (tree context, tree name, tree fullname,
2920 enum tag_types tag_type)
2928 if (typename_htab == NULL)
2929 typename_htab = htab_create_ggc (61, &typename_hash,
2930 &typename_compare, NULL);
2932 ti.scope = FROB_CONTEXT (context);
2934 ti.template_id = fullname;
2935 ti.enum_p = tag_type == enum_type;
2936 ti.class_p = (tag_type == class_type
2937 || tag_type == record_type
2938 || tag_type == union_type);
2939 hash = (htab_hash_pointer (ti.scope)
2940 ^ htab_hash_pointer (ti.name));
2942 /* See if we already have this type. */
2943 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2948 /* Build the TYPENAME_TYPE. */
2949 t = cxx_make_type (TYPENAME_TYPE);
2950 TYPE_CONTEXT (t) = ti.scope;
2951 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2952 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2953 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2955 /* Build the corresponding TYPE_DECL. */
2956 d = build_decl (input_location, TYPE_DECL, name, t);
2957 TYPE_NAME (TREE_TYPE (d)) = d;
2958 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2959 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2960 DECL_ARTIFICIAL (d) = 1;
2962 /* Store it in the hash table. */
2965 /* TYPENAME_TYPEs must always be compared structurally, because
2966 they may or may not resolve down to another type depending on
2967 the currently open classes. */
2968 SET_TYPE_STRUCTURAL_EQUALITY (t);
2974 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2975 provided to name the type. Returns an appropriate type, unless an
2976 error occurs, in which case error_mark_node is returned. If we
2977 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2978 return that, rather than the _TYPE it corresponds to, in other
2979 cases we look through the type decl. If TF_ERROR is set, complain
2980 about errors, otherwise be quiet. */
2983 make_typename_type (tree context, tree name, enum tag_types tag_type,
2984 tsubst_flags_t complain)
2990 if (name == error_mark_node
2991 || context == NULL_TREE
2992 || context == error_mark_node)
2993 return error_mark_node;
2997 if (!(TYPE_LANG_SPECIFIC (name)
2998 && (CLASSTYPE_IS_TEMPLATE (name)
2999 || CLASSTYPE_USE_TEMPLATE (name))))
3000 name = TYPE_IDENTIFIER (name);
3002 /* Create a TEMPLATE_ID_EXPR for the type. */
3003 name = build_nt (TEMPLATE_ID_EXPR,
3004 CLASSTYPE_TI_TEMPLATE (name),
3005 CLASSTYPE_TI_ARGS (name));
3007 else if (TREE_CODE (name) == TYPE_DECL)
3008 name = DECL_NAME (name);
3012 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3014 name = TREE_OPERAND (name, 0);
3015 if (TREE_CODE (name) == TEMPLATE_DECL)
3016 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3017 else if (TREE_CODE (name) == OVERLOAD)
3019 error ("%qD is not a type", name);
3020 return error_mark_node;
3023 if (TREE_CODE (name) == TEMPLATE_DECL)
3025 error ("%qD used without template parameters", name);
3026 return error_mark_node;
3028 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3029 gcc_assert (TYPE_P (context));
3031 if (!MAYBE_CLASS_TYPE_P (context))
3033 if (complain & tf_error)
3034 error ("%q#T is not a class", context);
3035 return error_mark_node;
3038 /* When the CONTEXT is a dependent type, NAME could refer to a
3039 dependent base class of CONTEXT. But look inside it anyway
3040 if CONTEXT is a currently open scope, in case it refers to a
3041 member of the current instantiation or a non-dependent base;
3042 lookup will stop when we hit a dependent base. */
3043 if (!dependent_scope_p (context))
3044 /* We should only set WANT_TYPE when we're a nested typename type.
3045 Then we can give better diagnostics if we find a non-type. */
3046 t = lookup_field (context, name, 2, /*want_type=*/true);
3050 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3051 return build_typename_type (context, name, fullname, tag_type);
3053 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3057 if (complain & tf_error)
3058 error (want_template ? "no class template named %q#T in %q#T"
3059 : "no type named %q#T in %q#T", name, context);
3060 return error_mark_node;
3063 /* Pull out the template from an injected-class-name (or multiple). */
3065 t = maybe_get_template_decl_from_type_decl (t);
3067 if (TREE_CODE (t) == TREE_LIST)
3069 if (complain & tf_error)
3071 error ("lookup of %qT in %qT is ambiguous", name, context);
3072 print_candidates (t);
3074 return error_mark_node;
3077 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3079 if (complain & tf_error)
3080 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3082 return error_mark_node;
3084 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3086 if (complain & tf_error)
3087 error ("%<typename %T::%D%> names %q#T, which is not a type",
3089 return error_mark_node;
3092 if (complain & tf_error)
3093 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3095 /* If we are currently parsing a template and if T is a typedef accessed
3096 through CONTEXT then we need to remember and check access of T at
3097 template instantiation time. */
3098 add_typedef_to_current_template_for_access_check (t, context, input_location);
3101 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3103 /*entering_scope=*/0,
3104 tf_warning_or_error | tf_user);
3106 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3112 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3113 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3114 in which case error_mark_node is returned.
3116 If PARM_LIST is non-NULL, also make sure that the template parameter
3117 list of TEMPLATE_DECL matches.
3119 If COMPLAIN zero, don't complain about any errors that occur. */
3122 make_unbound_class_template (tree context, tree name, tree parm_list,
3123 tsubst_flags_t complain)
3129 name = TYPE_IDENTIFIER (name);
3130 else if (DECL_P (name))
3131 name = DECL_NAME (name);
3132 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3134 if (!dependent_type_p (context)
3135 || currently_open_class (context))
3137 tree tmpl = NULL_TREE;
3139 if (MAYBE_CLASS_TYPE_P (context))
3140 tmpl = lookup_field (context, name, 0, false);
3142 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3144 if (complain & tf_error)
3145 error ("no class template named %q#T in %q#T", name, context);
3146 return error_mark_node;
3150 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3152 if (complain & tf_error)
3154 error ("template parameters do not match template");
3155 error ("%q+D declared here", tmpl);
3157 return error_mark_node;
3160 if (complain & tf_error)
3161 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3166 /* Build the UNBOUND_CLASS_TEMPLATE. */
3167 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3168 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3169 TREE_TYPE (t) = NULL_TREE;
3170 SET_TYPE_STRUCTURAL_EQUALITY (t);
3172 /* Build the corresponding TEMPLATE_DECL. */
3173 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3174 TYPE_NAME (TREE_TYPE (d)) = d;
3175 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3176 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3177 DECL_ARTIFICIAL (d) = 1;
3178 DECL_TEMPLATE_PARMS (d) = parm_list;
3185 /* Push the declarations of builtin types into the namespace.
3186 RID_INDEX is the index of the builtin type in the array
3187 RID_POINTERS. NAME is the name used when looking up the builtin
3188 type. TYPE is the _TYPE node for the builtin type. */
3191 record_builtin_type (enum rid rid_index,
3195 tree rname = NULL_TREE, tname = NULL_TREE;
3196 tree tdecl = NULL_TREE;
3198 if ((int) rid_index < (int) RID_MAX)
3199 rname = ridpointers[(int) rid_index];
3201 tname = get_identifier (name);
3203 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3204 eliminated. Built-in types should not be looked up name; their
3205 names are keywords that the parser can recognize. However, there
3206 is code in c-common.c that uses identifier_global_value to look
3207 up built-in types by name. */
3210 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3211 DECL_ARTIFICIAL (tdecl) = 1;
3212 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3218 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3219 DECL_ARTIFICIAL (tdecl) = 1;
3221 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3224 if (!TYPE_NAME (type))
3225 TYPE_NAME (type) = tdecl;
3228 debug_hooks->type_decl (tdecl, 0);
3231 /* Record one of the standard Java types.
3232 * Declare it as having the given NAME.
3233 * If SIZE > 0, it is the size of one of the integral types;
3234 * otherwise it is the negative of the size of one of the other types. */
3237 record_builtin_java_type (const char* name, int size)
3241 type = build_nonstandard_integer_type (size, 0);
3242 else if (size > -32)
3245 /* "__java_char" or ""__java_boolean". */
3246 type = build_nonstandard_integer_type (-size, 1);
3247 /* Get the signed type cached and attached to the unsigned type,
3248 so it doesn't get garbage-collected at "random" times,
3249 causing potential codegen differences out of different UIDs
3250 and different alias set numbers. */
3251 stype = build_nonstandard_integer_type (-size, 0);
3252 TREE_CHAIN (type) = stype;
3253 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3256 { /* "__java_float" or ""__java_double". */
3257 type = make_node (REAL_TYPE);
3258 TYPE_PRECISION (type) = - size;
3261 record_builtin_type (RID_MAX, name, type);
3262 decl = TYPE_NAME (type);
3264 /* Suppress generate debug symbol entries for these types,
3265 since for normal C++ they are just clutter.
3266 However, push_lang_context undoes this if extern "Java" is seen. */
3267 DECL_IGNORED_P (decl) = 1;
3269 TYPE_FOR_JAVA (type) = 1;
3273 /* Push a type into the namespace so that the back ends ignore it. */
3276 record_unknown_type (tree type, const char* name)
3278 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3279 TYPE_DECL, get_identifier (name), type));
3280 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3281 DECL_IGNORED_P (decl) = 1;
3282 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3283 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3284 TYPE_ALIGN (type) = 1;
3285 TYPE_USER_ALIGN (type) = 0;
3286 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3289 /* A string for which we should create an IDENTIFIER_NODE at
3292 typedef struct predefined_identifier
3294 /* The name of the identifier. */
3295 const char *const name;
3296 /* The place where the IDENTIFIER_NODE should be stored. */
3298 /* Nonzero if this is the name of a constructor or destructor. */
3299 const int ctor_or_dtor_p;
3300 } predefined_identifier;
3302 /* Create all the predefined identifiers. */
3305 initialize_predefined_identifiers (void)
3307 const predefined_identifier *pid;
3309 /* A table of identifiers to create at startup. */
3310 static const predefined_identifier predefined_identifiers[] = {
3311 { "C++", &lang_name_cplusplus, 0 },
3312 { "C", &lang_name_c, 0 },
3313 { "Java", &lang_name_java, 0 },
3314 /* Some of these names have a trailing space so that it is
3315 impossible for them to conflict with names written by users. */
3316 { "__ct ", &ctor_identifier, 1 },
3317 { "__base_ctor ", &base_ctor_identifier, 1 },
3318 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3319 { "__dt ", &dtor_identifier, 1 },
3320 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3321 { "__base_dtor ", &base_dtor_identifier, 1 },
3322 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3323 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3324 { "nelts", &nelts_identifier, 0 },
3325 { THIS_NAME, &this_identifier, 0 },
3326 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3327 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3328 { "_vptr", &vptr_identifier, 0 },
3329 { "__vtt_parm", &vtt_parm_identifier, 0 },
3330 { "::", &global_scope_name, 0 },
3331 { "std", &std_identifier, 0 },
3335 for (pid = predefined_identifiers; pid->name; ++pid)
3337 *pid->node = get_identifier (pid->name);
3338 if (pid->ctor_or_dtor_p)
3339 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3343 /* Create the predefined scalar types of C,
3344 and some nodes representing standard constants (0, 1, (void *)0).
3345 Initialize the global binding level.
3346 Make definitions for built-in primitive functions. */
3349 cxx_init_decl_processing (void)
3352 tree void_ftype_ptr;
3354 build_common_tree_nodes (flag_signed_char, false);
3356 /* Create all the identifiers we need. */
3357 initialize_predefined_identifiers ();
3359 /* Create the global variables. */
3360 push_to_top_level ();
3362 current_function_decl = NULL_TREE;
3363 current_binding_level = NULL;
3364 /* Enter the global namespace. */
3365 gcc_assert (global_namespace == NULL_TREE);
3366 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3368 TREE_PUBLIC (global_namespace) = 1;
3369 begin_scope (sk_namespace, global_namespace);
3371 current_lang_name = NULL_TREE;
3373 if (flag_visibility_ms_compat)
3374 default_visibility = VISIBILITY_HIDDEN;
3377 current_lang_name = lang_name_c;
3379 /* Create the `std' namespace. */
3380 push_namespace (std_identifier);
3381 std_node = current_namespace;
3384 c_common_nodes_and_builtins ();
3386 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3387 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3388 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3389 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3390 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3391 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3392 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3393 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3395 integer_two_node = build_int_cst (NULL_TREE, 2);
3396 integer_three_node = build_int_cst (NULL_TREE, 3);
3398 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3399 truthvalue_type_node = boolean_type_node;
3400 truthvalue_false_node = boolean_false_node;
3401 truthvalue_true_node = boolean_true_node;
3403 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3406 record_builtin_type (RID_MAX, NULL, string_type_node);
3409 delta_type_node = ptrdiff_type_node;
3410 vtable_index_type = ptrdiff_type_node;
3412 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3413 void_ftype = build_function_type (void_type_node, void_list_node);
3414 void_ftype_ptr = build_function_type (void_type_node,
3415 tree_cons (NULL_TREE,
3419 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3421 /* C++ extensions */
3423 unknown_type_node = make_node (UNKNOWN_TYPE);
3424 record_unknown_type (unknown_type_node, "unknown type");
3426 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3427 TREE_TYPE (unknown_type_node) = unknown_type_node;
3429 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3431 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3432 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3434 init_list_type_node = make_node (UNKNOWN_TYPE);
3435 record_unknown_type (init_list_type_node, "init list");
3438 /* Make sure we get a unique function type, so we can give
3439 its pointer type a name. (This wins for gdb.) */
3440 tree vfunc_type = make_node (FUNCTION_TYPE);
3441 TREE_TYPE (vfunc_type) = integer_type_node;
3442 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3443 layout_type (vfunc_type);
3445 vtable_entry_type = build_pointer_type (vfunc_type);
3447 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3450 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3451 layout_type (vtbl_type_node);
3452 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3453 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3454 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3455 layout_type (vtbl_ptr_type_node);
3456 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3458 push_namespace (get_identifier ("__cxxabiv1"));
3459 abi_node = current_namespace;
3462 global_type_node = make_node (LANG_TYPE);
3463 record_unknown_type (global_type_node, "global type");
3466 current_lang_name = lang_name_cplusplus;
3470 tree bad_alloc_type_node;
3471 tree bad_alloc_decl;
3472 tree newtype, deltype;
3473 tree ptr_ftype_sizetype;
3475 push_namespace (std_identifier);
3476 bad_alloc_id = get_identifier ("bad_alloc");
3477 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3478 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3480 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3481 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3485 = build_function_type (ptr_type_node,
3486 tree_cons (NULL_TREE,
3489 newtype = build_exception_variant
3490 (ptr_ftype_sizetype, add_exception_specifier
3491 (NULL_TREE, bad_alloc_type_node, -1));
3492 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3493 push_cp_library_fn (NEW_EXPR, newtype);
3494 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3495 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3496 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3500 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3502 /* Perform other language dependent initializations. */
3503 init_class_processing ();
3504 init_rtti_processing ();
3505 init_template_processing ();
3507 if (flag_exceptions)
3508 init_exception_processing ();
3510 if (! supports_one_only ())
3513 make_fname_decl = cp_make_fname_decl;
3514 start_fname_decls ();
3516 /* Show we use EH for cleanups. */
3517 if (flag_exceptions)
3518 using_eh_for_cleanups ();
3521 /* Generate an initializer for a function naming variable from
3522 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3523 filled in with the type of the init. */
3526 cp_fname_init (const char* name, tree *type_p)
3528 tree domain = NULL_TREE;
3530 tree init = NULL_TREE;
3535 length = strlen (name);
3536 domain = build_index_type (size_int (length));
3537 init = build_string (length + 1, name);
3540 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3541 type = build_cplus_array_type (type, domain);
3546 TREE_TYPE (init) = type;
3548 init = error_mark_node;
3553 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3554 the decl, LOC is the location to give the decl, NAME is the
3555 initialization string and TYPE_DEP indicates whether NAME depended
3556 on the type of the function. We make use of that to detect
3557 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3558 at the point of first use, so we mustn't push the decl now. */
3561 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3563 const char *const name = (type_dep && processing_template_decl
3564 ? NULL : fname_as_string (type_dep));
3566 tree init = cp_fname_init (name, &type);
3567 tree decl = build_decl (loc, VAR_DECL, id, type);
3570 free (CONST_CAST (char *, name));
3572 /* As we're using pushdecl_with_scope, we must set the context. */
3573 DECL_CONTEXT (decl) = current_function_decl;
3574 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3576 TREE_STATIC (decl) = 1;
3577 TREE_READONLY (decl) = 1;
3578 DECL_ARTIFICIAL (decl) = 1;
3580 TREE_USED (decl) = 1;
3582 if (current_function_decl)
3584 struct cp_binding_level *b = current_binding_level;
3585 while (b->level_chain->kind != sk_function_parms)
3587 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3588 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3589 LOOKUP_ONLYCONVERTING);
3592 pushdecl_top_level_and_finish (decl, init);
3598 builtin_function_1 (tree decl, tree context, bool is_global)
3600 tree id = DECL_NAME (decl);
3601 const char *name = IDENTIFIER_POINTER (id);
3603 retrofit_lang_decl (decl);
3605 DECL_ARTIFICIAL (decl) = 1;
3606 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3607 SET_DECL_LANGUAGE (decl, lang_c);
3608 /* Runtime library routines are, by definition, available in an
3609 external shared object. */
3610 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3611 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3613 DECL_CONTEXT (decl) = context;
3616 pushdecl_top_level (decl);
3620 /* A function in the user's namespace should have an explicit
3621 declaration before it is used. Mark the built-in function as
3622 anticipated but not actually declared. */
3623 if (name[0] != '_' || name[1] != '_')
3624 DECL_ANTICIPATED (decl) = 1;
3625 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3627 size_t len = strlen (name);
3629 /* Treat __*_chk fortification functions as anticipated as well,
3630 unless they are __builtin_*. */
3631 if (len > strlen ("___chk")
3632 && memcmp (name + len - strlen ("_chk"),
3633 "_chk", strlen ("_chk") + 1) == 0)
3634 DECL_ANTICIPATED (decl) = 1;
3641 cxx_builtin_function (tree decl)
3643 tree id = DECL_NAME (decl);
3644 const char *name = IDENTIFIER_POINTER (id);
3645 /* All builtins that don't begin with an '_' should additionally
3646 go in the 'std' namespace. */
3649 tree decl2 = copy_node(decl);
3650 push_namespace (std_identifier);
3651 builtin_function_1 (decl2, std_node, false);
3655 return builtin_function_1 (decl, NULL_TREE, false);
3658 /* Like cxx_builtin_function, but guarantee the function is added to the global
3659 scope. This is to allow function specific options to add new machine
3660 dependent builtins when the target ISA changes via attribute((target(...)))
3661 which saves space on program startup if the program does not use non-generic
3665 cxx_builtin_function_ext_scope (tree decl)
3668 tree id = DECL_NAME (decl);
3669 const char *name = IDENTIFIER_POINTER (id);
3670 /* All builtins that don't begin with an '_' should additionally
3671 go in the 'std' namespace. */
3674 tree decl2 = copy_node(decl);
3675 push_namespace (std_identifier);
3676 builtin_function_1 (decl2, std_node, true);
3680 return builtin_function_1 (decl, NULL_TREE, true);
3683 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3684 function. Not called directly. */
3687 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3689 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3690 DECL_EXTERNAL (fn) = 1;
3691 TREE_PUBLIC (fn) = 1;
3692 DECL_ARTIFICIAL (fn) = 1;
3693 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3694 SET_DECL_LANGUAGE (fn, lang_c);
3695 /* Runtime library routines are, by definition, available in an
3696 external shared object. */
3697 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3698 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3702 /* Returns the _DECL for a library function with C linkage.
3703 We assume that such functions never throw; if this is incorrect,
3704 callers should unset TREE_NOTHROW. */
3707 build_library_fn (tree name, tree type)
3709 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3710 TREE_NOTHROW (fn) = 1;
3714 /* Returns the _DECL for a library function with C++ linkage. */
3717 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3719 tree fn = build_library_fn_1 (name, operator_code, type);
3720 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3721 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3722 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3726 /* Like build_library_fn, but takes a C string instead of an
3730 build_library_fn_ptr (const char* name, tree type)
3732 return build_library_fn (get_identifier (name), type);
3735 /* Like build_cp_library_fn, but takes a C string instead of an
3739 build_cp_library_fn_ptr (const char* name, tree type)
3741 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3744 /* Like build_library_fn, but also pushes the function so that we will
3745 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3746 may throw exceptions listed in RAISES. */
3749 push_library_fn (tree name, tree type, tree raises)
3754 type = build_exception_variant (type, raises);
3756 fn = build_library_fn (name, type);
3757 pushdecl_top_level (fn);
3761 /* Like build_cp_library_fn, but also pushes the function so that it
3762 will be found by normal lookup. */
3765 push_cp_library_fn (enum tree_code operator_code, tree type)
3767 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3774 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3778 push_void_library_fn (tree name, tree parmtypes)
3780 tree type = build_function_type (void_type_node, parmtypes);
3781 return push_library_fn (name, type, NULL_TREE);
3784 /* Like push_library_fn, but also note that this function throws
3785 and does not return. Used for __throw_foo and the like. */
3788 push_throw_library_fn (tree name, tree type)
3790 tree fn = push_library_fn (name, type, NULL_TREE);
3791 TREE_THIS_VOLATILE (fn) = 1;
3792 TREE_NOTHROW (fn) = 0;
3796 /* When we call finish_struct for an anonymous union, we create
3797 default copy constructors and such. But, an anonymous union
3798 shouldn't have such things; this function undoes the damage to the
3799 anonymous union type T.
3801 (The reason that we create the synthesized methods is that we don't
3802 distinguish `union { int i; }' from `typedef union { int i; } U'.
3803 The first is an anonymous union; the second is just an ordinary
3807 fixup_anonymous_aggr (tree t)
3811 /* Wipe out memory of synthesized methods. */
3812 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3813 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3814 TYPE_HAS_INIT_REF (t) = 0;
3815 TYPE_HAS_CONST_INIT_REF (t) = 0;
3816 TYPE_HAS_ASSIGN_REF (t) = 0;
3817 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3819 /* Splice the implicitly generated functions out of the TYPE_METHODS
3821 q = &TYPE_METHODS (t);
3824 if (DECL_ARTIFICIAL (*q))
3825 *q = TREE_CHAIN (*q);
3827 q = &TREE_CHAIN (*q);
3830 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3831 if (TYPE_METHODS (t))
3833 tree decl = TYPE_MAIN_DECL (t);
3835 if (TREE_CODE (t) != UNION_TYPE)
3836 error_at (DECL_SOURCE_LOCATION (decl),
3837 "an anonymous struct cannot have function members");
3839 error_at (DECL_SOURCE_LOCATION (decl),
3840 "an anonymous union cannot have function members");
3843 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3844 assignment operators (because they cannot have these methods themselves).
3845 For anonymous unions this is already checked because they are not allowed
3846 in any union, otherwise we have to check it. */
3847 if (TREE_CODE (t) != UNION_TYPE)
3851 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3852 if (TREE_CODE (field) == FIELD_DECL)
3854 type = TREE_TYPE (field);
3855 if (CLASS_TYPE_P (type))
3857 if (TYPE_NEEDS_CONSTRUCTING (type))
3858 error ("member %q+#D with constructor not allowed "
3859 "in anonymous aggregate", field);
3860 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3861 error ("member %q+#D with destructor not allowed "
3862 "in anonymous aggregate", field);
3863 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3864 error ("member %q+#D with copy assignment operator "
3865 "not allowed in anonymous aggregate", field);
3871 /* Make sure that a declaration with no declarator is well-formed, i.e.
3872 just declares a tagged type or anonymous union.
3874 Returns the type declared; or NULL_TREE if none. */
3877 check_tag_decl (cp_decl_specifier_seq *declspecs)
3879 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3880 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3881 /* If a class, struct, or enum type is declared by the DECLSPECS
3882 (i.e, if a class-specifier, enum-specifier, or non-typename
3883 elaborated-type-specifier appears in the DECLSPECS),
3884 DECLARED_TYPE is set to the corresponding type. */
3885 tree declared_type = NULL_TREE;
3886 bool error_p = false;
3888 if (declspecs->multiple_types_p)
3889 error ("multiple types in one declaration");
3890 else if (declspecs->redefined_builtin_type)
3892 if (!in_system_header)
3893 permerror (input_location, "redeclaration of C++ built-in type %qT",
3894 declspecs->redefined_builtin_type);
3899 && TYPE_P (declspecs->type)
3900 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3901 && MAYBE_CLASS_TYPE_P (declspecs->type))
3902 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3903 declared_type = declspecs->type;
3904 else if (declspecs->type == error_mark_node)
3906 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3907 permerror (input_location, "declaration does not declare anything");
3908 /* Check for an anonymous union. */
3909 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3910 && TYPE_ANONYMOUS_P (declared_type))
3912 /* 7/3 In a simple-declaration, the optional init-declarator-list
3913 can be omitted only when declaring a class (clause 9) or
3914 enumeration (7.2), that is, when the decl-specifier-seq contains
3915 either a class-specifier, an elaborated-type-specifier with
3916 a class-key (9.1), or an enum-specifier. In these cases and
3917 whenever a class-specifier or enum-specifier is present in the
3918 decl-specifier-seq, the identifiers in these specifiers are among
3919 the names being declared by the declaration (as class-name,
3920 enum-names, or enumerators, depending on the syntax). In such
3921 cases, and except for the declaration of an unnamed bit-field (9.6),
3922 the decl-specifier-seq shall introduce one or more names into the
3923 program, or shall redeclare a name introduced by a previous
3924 declaration. [Example:
3925 enum { }; // ill-formed
3926 typedef class { }; // ill-formed
3930 error ("missing type-name in typedef-declaration");
3933 /* Anonymous unions are objects, so they can have specifiers. */;
3934 SET_ANON_AGGR_TYPE_P (declared_type);
3936 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3937 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3942 if (declspecs->specs[(int)ds_inline]
3943 || declspecs->specs[(int)ds_virtual])
3944 error ("%qs can only be specified for functions",
3945 declspecs->specs[(int)ds_inline]
3946 ? "inline" : "virtual");
3948 && (!current_class_type
3949 || current_scope () != current_class_type))
3950 error ("%<friend%> can only be specified inside a class");
3951 else if (declspecs->specs[(int)ds_explicit])
3952 error ("%<explicit%> can only be specified for constructors");
3953 else if (declspecs->storage_class)
3954 error ("a storage class can only be specified for objects "
3956 else if (declspecs->specs[(int)ds_const]
3957 || declspecs->specs[(int)ds_volatile]
3958 || declspecs->specs[(int)ds_restrict]
3959 || declspecs->specs[(int)ds_thread])
3960 error ("qualifiers can only be specified for objects "
3962 else if (saw_typedef)
3963 warning (0, "%<typedef%> was ignored in this declaration");
3964 else if (declspecs->specs[(int) ds_constexpr])
3965 error ("%<constexpr> cannot be used for type declarations");
3968 return declared_type;
3971 /* Called when a declaration is seen that contains no names to declare.
3972 If its type is a reference to a structure, union or enum inherited
3973 from a containing scope, shadow that tag name for the current scope
3974 with a forward reference.
3975 If its type defines a new named structure or union
3976 or defines an enum, it is valid but we need not do anything here.
3977 Otherwise, it is an error.
3979 C++: may have to grok the declspecs to learn about static,
3980 complain for anonymous unions.
3982 Returns the TYPE declared -- or NULL_TREE if none. */
3985 shadow_tag (cp_decl_specifier_seq *declspecs)
3987 tree t = check_tag_decl (declspecs);
3992 if (declspecs->attributes)
3994 warning (0, "attribute ignored in declaration of %q+#T", t);
3995 warning (0, "attribute for %q+#T must follow the %qs keyword",
3996 t, class_key_or_enum_as_string (t));
4000 if (maybe_process_partial_specialization (t) == error_mark_node)
4003 /* This is where the variables in an anonymous union are
4004 declared. An anonymous union declaration looks like:
4006 because there is no declarator after the union, the parser
4007 sends that declaration here. */
4008 if (ANON_AGGR_TYPE_P (t))
4010 fixup_anonymous_aggr (t);
4012 if (TYPE_FIELDS (t))
4014 tree decl = grokdeclarator (/*declarator=*/NULL,
4015 declspecs, NORMAL, 0, NULL);
4016 finish_anon_union (decl);
4023 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4026 groktypename (cp_decl_specifier_seq *type_specifiers,
4027 const cp_declarator *declarator,
4028 bool is_template_arg)
4032 enum decl_context context
4033 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4034 attrs = type_specifiers->attributes;
4035 type_specifiers->attributes = NULL_TREE;
4036 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4037 if (attrs && type != error_mark_node)
4039 if (CLASS_TYPE_P (type))
4040 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4041 "outside of definition", type);
4042 else if (MAYBE_CLASS_TYPE_P (type))
4043 /* A template type parameter or other dependent type. */
4044 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4045 "type %qT without an associated declaration", type);
4047 cplus_decl_attributes (&type, attrs, 0);
4052 /* Process a DECLARATOR for a function-scope variable declaration,
4053 namespace-scope variable declaration, or function declaration.
4054 (Function definitions go through start_function; class member
4055 declarations appearing in the body of the class go through
4056 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4057 If an error occurs, the error_mark_node is returned instead.
4059 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4060 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4061 for an explicitly defaulted function, or SD_DELETED for an explicitly
4062 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4063 implicitly initialized via a default constructor. ATTRIBUTES and
4064 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4065 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4066 set, the caller is responsible for calling pop_scope. */
4069 start_decl (const cp_declarator *declarator,
4070 cp_decl_specifier_seq *declspecs,
4073 tree prefix_attributes,
4074 tree *pushed_scope_p)
4081 *pushed_scope_p = NULL_TREE;
4083 /* An object declared as __attribute__((deprecated)) suppresses
4084 warnings of uses of other deprecated items. */
4085 if (lookup_attribute ("deprecated", attributes))
4086 deprecated_state = DEPRECATED_SUPPRESS;
4088 attributes = chainon (attributes, prefix_attributes);
4090 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4093 deprecated_state = DEPRECATED_NORMAL;
4095 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4096 || decl == error_mark_node)
4097 return error_mark_node;
4099 context = DECL_CONTEXT (decl);
4103 *pushed_scope_p = push_scope (context);
4105 /* We are only interested in class contexts, later. */
4106 if (TREE_CODE (context) == NAMESPACE_DECL)
4107 context = NULL_TREE;
4111 /* Is it valid for this decl to have an initializer at all?
4112 If not, set INITIALIZED to zero, which will indirectly
4113 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4114 switch (TREE_CODE (decl))
4117 error ("typedef %qD is initialized (use decltype instead)", decl);
4118 return error_mark_node;
4121 if (initialized == SD_DELETED)
4122 /* We'll handle the rest of the semantics later, but we need to
4123 set this now so it's visible to duplicate_decls. */
4124 DECL_DELETED_FN (decl) = 1;
4133 if (! toplevel_bindings_p ()
4134 && DECL_EXTERNAL (decl))
4135 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4137 DECL_EXTERNAL (decl) = 0;
4138 if (toplevel_bindings_p ())
4139 TREE_STATIC (decl) = 1;
4142 /* If this is a typedef that names the class for linkage purposes
4143 (7.1.3p8), apply any attributes directly to the type. */
4144 if (TREE_CODE (decl) == TYPE_DECL
4145 && TAGGED_TYPE_P (TREE_TYPE (decl))
4146 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4147 flags = ATTR_FLAG_TYPE_IN_PLACE;
4151 /* Set attributes here so if duplicate decl, will have proper attributes. */
4152 cplus_decl_attributes (&decl, attributes, flags);
4154 /* Dllimported symbols cannot be defined. Static data members (which
4155 can be initialized in-class and dllimported) go through grokfield,
4156 not here, so we don't need to exclude those decls when checking for
4158 if (initialized && DECL_DLLIMPORT_P (decl))
4160 error ("definition of %q#D is marked %<dllimport%>", decl);
4161 DECL_DLLIMPORT_P (decl) = 0;
4164 /* If #pragma weak was used, mark the decl weak now. */
4165 maybe_apply_pragma_weak (decl);
4167 if (TREE_CODE (decl) == FUNCTION_DECL
4168 && DECL_DECLARED_INLINE_P (decl)
4169 && DECL_UNINLINABLE (decl)
4170 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4171 warning (0, "inline function %q+D given attribute noinline", decl);
4173 if (context && COMPLETE_TYPE_P (complete_type (context)))
4175 if (TREE_CODE (decl) == VAR_DECL)
4177 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4178 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4179 error ("%q#D is not a static member of %q#T", decl, context);
4182 if (DECL_CONTEXT (field) != context)
4184 if (!same_type_p (DECL_CONTEXT (field), context))
4185 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4186 "to be defined as %<%T::%D%>",
4187 DECL_CONTEXT (field), DECL_NAME (decl),
4188 context, DECL_NAME (decl));
4189 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4191 if (processing_specialization
4192 && template_class_depth (context) == 0
4193 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4194 error ("template header not allowed in member definition "
4195 "of explicitly specialized class");
4196 /* Static data member are tricky; an in-class initialization
4197 still doesn't provide a definition, so the in-class
4198 declaration will have DECL_EXTERNAL set, but will have an
4199 initialization. Thus, duplicate_decls won't warn
4200 about this situation, and so we check here. */
4201 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4202 error ("duplicate initialization of %qD", decl);
4203 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4205 if (declspecs->specs[(int) ds_constexpr]
4206 && !DECL_DECLARED_CONSTEXPR_P (field))
4207 error ("%qD declared %<constexpr%> outside its class", field);
4212 tree field = check_classfn (context, decl,
4213 (processing_template_decl
4214 > template_class_depth (context))
4215 ? current_template_parms
4217 if (field && field != error_mark_node
4218 && duplicate_decls (decl, field,
4219 /*newdecl_is_friend=*/false))
4223 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4224 DECL_IN_AGGR_P (decl) = 0;
4225 /* Do not mark DECL as an explicit specialization if it was not
4226 already marked as an instantiation; a declaration should
4227 never be marked as a specialization unless we know what
4228 template is being specialized. */
4229 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4231 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4233 /* [temp.expl.spec] An explicit specialization of a static data
4234 member of a template is a definition if the declaration
4235 includes an initializer; otherwise, it is a declaration.
4237 We check for processing_specialization so this only applies
4238 to the new specialization syntax. */
4239 if (!initialized && processing_specialization)
4240 DECL_EXTERNAL (decl) = 1;
4243 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4244 permerror (input_location, "declaration of %q#D outside of class is not definition",
4247 if (!ensure_literal_type_for_constexpr_object (decl))
4248 return error_mark_node;
4251 was_public = TREE_PUBLIC (decl);
4253 /* Enter this declaration into the symbol table. */
4254 decl = maybe_push_decl (decl);
4256 if (processing_template_decl)
4257 decl = push_template_decl (decl);
4258 if (decl == error_mark_node)
4259 return error_mark_node;
4261 /* Tell the back end to use or not use .common as appropriate. If we say
4262 -fconserve-space, we want this to save .data space, at the expense of
4263 wrong semantics. If we say -fno-conserve-space, we want this to
4264 produce errors about redefs; to do this we force variables into the
4266 if (flag_conserve_space
4267 && TREE_CODE (decl) == VAR_DECL
4268 && TREE_PUBLIC (decl)
4269 && !DECL_THREAD_LOCAL_P (decl)
4270 && !have_global_bss_p ())
4271 DECL_COMMON (decl) = 1;
4273 if (TREE_CODE (decl) == VAR_DECL
4274 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4275 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4277 /* This is a const variable with implicit 'static'. Set
4278 DECL_THIS_STATIC so we can tell it from variables that are
4279 !TREE_PUBLIC because of the anonymous namespace. */
4280 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4281 DECL_THIS_STATIC (decl) = 1;
4284 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4285 start_decl_1 (decl, initialized);
4290 /* Process the declaration of a variable DECL. INITIALIZED is true
4291 iff DECL is explicitly initialized. (INITIALIZED is false if the
4292 variable is initialized via an implicitly-called constructor.)
4293 This function must be called for ordinary variables (including, for
4294 example, implicit instantiations of templates), but must not be
4295 called for template declarations. */
4298 start_decl_1 (tree decl, bool initialized)
4302 bool aggregate_definition_p;
4304 gcc_assert (!processing_template_decl);
4306 if (error_operand_p (decl))
4309 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4311 type = TREE_TYPE (decl);
4312 complete_p = COMPLETE_TYPE_P (type);
4313 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4315 /* If an explicit initializer is present, or if this is a definition
4316 of an aggregate, then we need a complete type at this point.
4317 (Scalars are always complete types, so there is nothing to
4318 check.) This code just sets COMPLETE_P; errors (if necessary)
4319 are issued below. */
4320 if ((initialized || aggregate_definition_p)
4322 && COMPLETE_TYPE_P (complete_type (type)))
4325 /* We will not yet have set TREE_READONLY on DECL if the type
4326 was "const", but incomplete, before this point. But, now, we
4327 have a complete type, so we can try again. */
4328 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4332 /* Is it valid for this decl to have an initializer at all? */
4334 /* Don't allow initializations for incomplete types except for
4335 arrays which might be completed by the initialization. */
4337 ; /* A complete type is ok. */
4338 else if (type_uses_auto (type))
4339 ; /* An auto type is ok. */
4340 else if (TREE_CODE (type) != ARRAY_TYPE)
4342 error ("variable %q#D has initializer but incomplete type", decl);
4343 type = TREE_TYPE (decl) = error_mark_node;
4345 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4347 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4348 error ("elements of array %q#D have incomplete type", decl);
4349 /* else we already gave an error in start_decl. */
4352 else if (aggregate_definition_p && !complete_p)
4354 if (type_uses_auto (type))
4355 error ("declaration of %q#D has no initializer", decl);
4357 error ("aggregate %q#D has incomplete type and cannot be defined",
4359 /* Change the type so that assemble_variable will give
4360 DECL an rtl we can live with: (mem (const_int 0)). */
4361 type = TREE_TYPE (decl) = error_mark_node;
4364 /* Create a new scope to hold this declaration if necessary.
4365 Whether or not a new scope is necessary cannot be determined
4366 until after the type has been completed; if the type is a
4367 specialization of a class template it is not until after
4368 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4369 will be set correctly. */
4370 maybe_push_cleanup_level (type);
4373 /* Handle initialization of references. DECL, TYPE, and INIT have the
4374 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4375 but will be set to a new CLEANUP_STMT if a temporary is created
4376 that must be destroyed subsequently.
4378 Returns an initializer expression to use to initialize DECL, or
4379 NULL if the initialization can be performed statically.
4381 Quotes on semantics can be found in ARM 8.4.3. */
4384 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4388 if (init == NULL_TREE)
4390 if ((DECL_LANG_SPECIFIC (decl) == 0
4391 || DECL_IN_AGGR_P (decl) == 0)
4392 && ! DECL_THIS_EXTERN (decl))
4393 error ("%qD declared as reference but not initialized", decl);
4397 if (TREE_CODE (init) == TREE_LIST)
4398 init = build_x_compound_expr_from_list (init, "initializer");
4400 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4401 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4402 /* Note: default conversion is only called in very special cases. */
4403 init = decay_conversion (init);
4405 /* Convert INIT to the reference type TYPE. This may involve the
4406 creation of a temporary, whose lifetime must be the same as that
4407 of the reference. If so, a DECL_EXPR for the temporary will be
4408 added just after the DECL_EXPR for DECL. That's why we don't set
4409 DECL_INITIAL for local references (instead assigning to them
4410 explicitly); we need to allow the temporary to be initialized
4412 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4414 if (tmp == error_mark_node)
4416 else if (tmp == NULL_TREE)
4418 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4422 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4425 DECL_INITIAL (decl) = tmp;
4430 /* Subroutine of check_initializer. We're initializing a DECL of
4431 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4432 extend the lifetime of the underlying array to match that of the decl,
4433 just like for reference initialization. CLEANUP is as for
4434 grok_reference_init. */
4437 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4439 tree aggr_init, array, arrtype;
4440 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4441 if (error_operand_p (init))
4442 return error_mark_node;
4444 aggr_init = TARGET_EXPR_INITIAL (init);
4445 init = build2 (INIT_EXPR, type, decl, init);
4447 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4448 arrtype = TREE_TYPE (array);
4450 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4451 array = TREE_OPERAND (array, 0);
4452 /* If the array is constant, finish_compound_literal already made it a
4453 static variable and we don't need to do anything here. */
4454 if (decl && TREE_CODE (array) == TARGET_EXPR)
4457 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4458 var = build_address (var);
4459 var = convert (arrtype, var);
4460 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4461 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4466 /* Designated initializers in arrays are not supported in GNU C++.
4467 The parser cannot detect this error since it does not know whether
4468 a given brace-enclosed initializer is for a class type or for an
4469 array. This function checks that CE does not use a designated
4470 initializer. If it does, an error is issued. Returns true if CE
4471 is valid, i.e., does not have a designated initializer. */
4474 check_array_designated_initializer (const constructor_elt *ce)
4476 /* Designated initializers for array elements are not supported. */
4479 /* The parser only allows identifiers as designated
4481 if (ce->index == error_mark_node)
4482 error ("name used in a GNU-style designated "
4483 "initializer for an array");
4486 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4487 error ("name %qD used in a GNU-style designated "
4488 "initializer for an array", ce->index);
4496 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4497 array until we finish parsing the initializer. If that's the
4498 situation we're in, update DECL accordingly. */
4501 maybe_deduce_size_from_array_init (tree decl, tree init)
4503 tree type = TREE_TYPE (decl);
4505 if (TREE_CODE (type) == ARRAY_TYPE
4506 && TYPE_DOMAIN (type) == NULL_TREE
4507 && TREE_CODE (decl) != TYPE_DECL)
4509 /* do_default is really a C-ism to deal with tentative definitions.
4510 But let's leave it here to ease the eventual merge. */
4511 int do_default = !DECL_EXTERNAL (decl);
4512 tree initializer = init ? init : DECL_INITIAL (decl);
4515 /* Check that there are no designated initializers in INIT, as
4516 those are not supported in GNU C++, and as the middle-end
4517 will crash if presented with a non-numeric designated
4519 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4521 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4522 constructor_elt *ce;
4525 VEC_iterate (constructor_elt, v, i, ce);
4527 if (!check_array_designated_initializer (ce))
4533 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4537 error ("initializer fails to determine size of %qD", decl);
4538 TREE_TYPE (decl) = error_mark_node;
4540 else if (failure == 2)
4544 error ("array size missing in %qD", decl);
4545 TREE_TYPE (decl) = error_mark_node;
4547 /* If a `static' var's size isn't known, make it extern as
4548 well as static, so it does not get allocated. If it's not
4549 `static', then don't mark it extern; finish_incomplete_decl
4550 will give it a default size and it will get allocated. */
4551 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4552 DECL_EXTERNAL (decl) = 1;
4554 else if (failure == 3)
4556 error ("zero-size array %qD", decl);
4557 TREE_TYPE (decl) = error_mark_node;
4561 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4563 relayout_decl (decl);
4567 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4568 any appropriate error messages regarding the layout. */
4571 layout_var_decl (tree decl)
4575 type = TREE_TYPE (decl);
4576 if (type == error_mark_node)
4579 /* If we haven't already layed out this declaration, do so now.
4580 Note that we must not call complete type for an external object
4581 because it's type might involve templates that we are not
4582 supposed to instantiate yet. (And it's perfectly valid to say
4583 `extern X x' for some incomplete type `X'.) */
4584 if (!DECL_EXTERNAL (decl))
4585 complete_type (type);
4586 if (!DECL_SIZE (decl)
4587 && TREE_TYPE (decl) != error_mark_node
4588 && (COMPLETE_TYPE_P (type)
4589 || (TREE_CODE (type) == ARRAY_TYPE
4590 && !TYPE_DOMAIN (type)
4591 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4592 layout_decl (decl, 0);
4594 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4596 /* An automatic variable with an incomplete type: that is an error.
4597 Don't talk about array types here, since we took care of that
4598 message in grokdeclarator. */
4599 error ("storage size of %qD isn't known", decl);
4600 TREE_TYPE (decl) = error_mark_node;
4603 /* Keep this code around in case we later want to control debug info
4604 based on whether a type is "used". (jason 1999-11-11) */
4606 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4607 /* Let debugger know it should output info for this type. */
4608 note_debug_info_needed (ttype);
4610 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4611 note_debug_info_needed (DECL_CONTEXT (decl));
4614 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4615 && DECL_SIZE (decl) != NULL_TREE
4616 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4618 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4619 constant_expression_warning (DECL_SIZE (decl));
4622 error ("storage size of %qD isn't constant", decl);
4623 TREE_TYPE (decl) = error_mark_node;
4628 /* If a local static variable is declared in an inline function, or if
4629 we have a weak definition, we must endeavor to create only one
4630 instance of the variable at link-time. */
4633 maybe_commonize_var (tree decl)
4635 /* Static data in a function with comdat linkage also has comdat
4637 if (TREE_STATIC (decl)
4638 /* Don't mess with __FUNCTION__. */
4639 && ! DECL_ARTIFICIAL (decl)
4640 && DECL_FUNCTION_SCOPE_P (decl)
4641 && vague_linkage_fn_p (DECL_CONTEXT (decl)))
4645 /* With weak symbols, we simply make the variable COMDAT;
4646 that will cause copies in multiple translations units to
4648 comdat_linkage (decl);
4652 if (DECL_INITIAL (decl) == NULL_TREE
4653 || DECL_INITIAL (decl) == error_mark_node)
4655 /* Without weak symbols, we can use COMMON to merge
4656 uninitialized variables. */
4657 TREE_PUBLIC (decl) = 1;
4658 DECL_COMMON (decl) = 1;
4662 /* While for initialized variables, we must use internal
4663 linkage -- which means that multiple copies will not
4665 TREE_PUBLIC (decl) = 0;
4666 DECL_COMMON (decl) = 0;
4667 warning_at (input_location, 0,
4668 "sorry: semantics of inline function static "
4669 "data %q+#D are wrong (you'll wind up "
4670 "with multiple copies)", decl);
4671 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4672 " you can work around this by removing "
4677 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4678 /* Set it up again; we might have set DECL_INITIAL since the last
4680 comdat_linkage (decl);
4683 /* Issue an error message if DECL is an uninitialized const variable. */
4686 check_for_uninitialized_const_var (tree decl)
4688 tree type = TREE_TYPE (decl);
4690 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
4691 && DECL_INITIAL (decl) == NULL)
4692 error ("missing initializer for constexpr %qD", decl);
4694 /* ``Unless explicitly declared extern, a const object does not have
4695 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4697 else if (TREE_CODE (decl) == VAR_DECL
4698 && TREE_CODE (type) != REFERENCE_TYPE
4699 && CP_TYPE_CONST_P (type)
4700 && !TYPE_NEEDS_CONSTRUCTING (type)
4701 && !DECL_INITIAL (decl))
4702 error ("uninitialized const %qD", decl);
4706 /* Structure holding the current initializer being processed by reshape_init.
4707 CUR is a pointer to the current element being processed, END is a pointer
4708 after the last element present in the initializer. */
4709 typedef struct reshape_iterator_t
4711 constructor_elt *cur;
4712 constructor_elt *end;
4715 static tree reshape_init_r (tree, reshape_iter *, bool);
4717 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4718 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4719 initialized. If there are no more such fields, the return value
4723 next_initializable_field (tree field)
4726 && (TREE_CODE (field) != FIELD_DECL
4727 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4728 || DECL_ARTIFICIAL (field)))
4729 field = TREE_CHAIN (field);
4734 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4735 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4736 INTEGER_CST representing the size of the array minus one (the maximum index),
4737 or NULL_TREE if the array was declared without specifying the size. D is
4738 the iterator within the constructor. */
4741 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4744 bool sized_array_p = (max_index != NULL_TREE);
4745 unsigned HOST_WIDE_INT max_index_cst = 0;
4746 unsigned HOST_WIDE_INT index;
4748 /* The initializer for an array is always a CONSTRUCTOR. */
4749 new_init = build_constructor (init_list_type_node, NULL);
4753 /* Minus 1 is used for zero sized arrays. */
4754 if (integer_all_onesp (max_index))
4757 if (host_integerp (max_index, 1))
4758 max_index_cst = tree_low_cst (max_index, 1);
4759 /* sizetype is sign extended, not zero extended. */
4761 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4765 /* Loop until there are no more initializers. */
4767 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4772 check_array_designated_initializer (d->cur);
4773 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4774 if (elt_init == error_mark_node)
4775 return error_mark_node;
4776 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4782 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4783 Parameters are the same of reshape_init_r. */
4786 reshape_init_array (tree type, reshape_iter *d)
4788 tree max_index = NULL_TREE;
4790 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4792 if (TYPE_DOMAIN (type))
4793 max_index = array_type_nelts (type);
4795 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4798 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4799 Parameters are the same of reshape_init_r. */
4802 reshape_init_vector (tree type, reshape_iter *d)
4804 tree max_index = NULL_TREE;
4807 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4809 if (COMPOUND_LITERAL_P (d->cur->value))
4811 tree value = d->cur->value;
4812 if (!same_type_p (TREE_TYPE (value), type))
4814 error ("invalid type %qT as initializer for a vector of type %qT",
4815 TREE_TYPE (d->cur->value), type);
4816 value = error_mark_node;
4822 /* For a vector, the representation type is a struct
4823 containing a single member which is an array of the
4824 appropriate size. */
4825 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4826 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4827 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4829 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4832 /* Subroutine of reshape_init_r, processes the initializers for classes
4833 or union. Parameters are the same of reshape_init_r. */
4836 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4841 gcc_assert (CLASS_TYPE_P (type));
4843 /* The initializer for a class is always a CONSTRUCTOR. */
4844 new_init = build_constructor (init_list_type_node, NULL);
4845 field = next_initializable_field (TYPE_FIELDS (type));
4851 An initializer for an aggregate member that is an
4852 empty class shall have the form of an empty
4853 initializer-list {}. */
4854 if (!first_initializer_p)
4856 error ("initializer for %qT must be brace-enclosed", type);
4857 return error_mark_node;
4862 /* Loop through the initializable fields, gathering initializers. */
4863 while (d->cur != d->end)
4867 /* Handle designated initializers, as an extension. */
4870 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4872 if (!field || TREE_CODE (field) != FIELD_DECL)
4874 error ("%qT has no non-static data member named %qD", type,
4876 return error_mark_node;
4880 /* If we processed all the member of the class, we are done. */
4884 field_init = reshape_init_r (TREE_TYPE (field), d,
4885 /*first_initializer_p=*/false);
4886 if (field_init == error_mark_node)
4887 return error_mark_node;
4889 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4893 When a union is initialized with a brace-enclosed
4894 initializer, the braces shall only contain an
4895 initializer for the first member of the union. */
4896 if (TREE_CODE (type) == UNION_TYPE)
4899 field = next_initializable_field (TREE_CHAIN (field));
4905 /* Subroutine of reshape_init, which processes a single initializer (part of
4906 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4907 iterator within the CONSTRUCTOR which points to the initializer to process.
4908 FIRST_INITIALIZER_P is true if this is the first initializer of the
4909 outermost CONSTRUCTOR node. */
4912 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4914 tree init = d->cur->value;
4916 if (error_operand_p (init))
4917 return error_mark_node;
4919 /* A non-aggregate type is always initialized with a single
4921 if (!CP_AGGREGATE_TYPE_P (type))
4923 /* It is invalid to initialize a non-aggregate type with a
4924 brace-enclosed initializer before C++0x.
4925 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4926 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4927 a CONSTRUCTOR (with a record type). */
4928 if (TREE_CODE (init) == CONSTRUCTOR
4929 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4931 if (SCALAR_TYPE_P (type))
4933 error ("braces around scalar initializer for type %qT", type);
4934 init = error_mark_node;
4937 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
4946 All implicit type conversions (clause _conv_) are considered when
4947 initializing the aggregate member with an initializer from an
4948 initializer-list. If the initializer can initialize a member,
4949 the member is initialized. Otherwise, if the member is itself a
4950 non-empty subaggregate, brace elision is assumed and the
4951 initializer is considered for the initialization of the first
4952 member of the subaggregate. */
4953 if (TREE_CODE (init) != CONSTRUCTOR
4954 /* But don't try this for the first initializer, since that would be
4955 looking through the outermost braces; A a2 = { a1 }; is not a
4956 valid aggregate initialization. */
4957 && !first_initializer_p
4958 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
4959 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
4965 /* [dcl.init.string]
4967 A char array (whether plain char, signed char, or unsigned char)
4968 can be initialized by a string-literal (optionally enclosed in
4969 braces); a wchar_t array can be initialized by a wide
4970 string-literal (optionally enclosed in braces). */
4971 if (TREE_CODE (type) == ARRAY_TYPE
4972 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4974 tree str_init = init;
4976 /* Strip one level of braces if and only if they enclose a single
4977 element (as allowed by [dcl.init.string]). */
4978 if (!first_initializer_p
4979 && TREE_CODE (str_init) == CONSTRUCTOR
4980 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4982 str_init = VEC_index (constructor_elt,
4983 CONSTRUCTOR_ELTS (str_init), 0)->value;
4986 /* If it's a string literal, then it's the initializer for the array
4987 as a whole. Otherwise, continue with normal initialization for
4988 array types (one value per array element). */
4989 if (TREE_CODE (str_init) == STRING_CST)
4996 /* The following cases are about aggregates. If we are not within a full
4997 initializer already, and there is not a CONSTRUCTOR, it means that there
4998 is a missing set of braces (that is, we are processing the case for
4999 which reshape_init exists). */
5000 if (!first_initializer_p)
5002 if (TREE_CODE (init) == CONSTRUCTOR)
5004 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
5005 /* There is no need to reshape pointer-to-member function
5006 initializers, as they are always constructed correctly
5007 by the front end. */
5009 else if (COMPOUND_LITERAL_P (init))
5010 /* For a nested compound literal, there is no need to reshape since
5011 brace elision is not allowed. Even if we decided to allow it,
5012 we should add a call to reshape_init in finish_compound_literal,
5013 before calling digest_init, so changing this code would still
5014 not be necessary. */
5015 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5019 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5020 return reshape_init (type, init);
5024 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5028 /* Dispatch to specialized routines. */
5029 if (CLASS_TYPE_P (type))
5030 return reshape_init_class (type, d, first_initializer_p);
5031 else if (TREE_CODE (type) == ARRAY_TYPE)
5032 return reshape_init_array (type, d);
5033 else if (TREE_CODE (type) == VECTOR_TYPE)
5034 return reshape_init_vector (type, d);
5039 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5040 brace-enclosed aggregate initializer.
5042 INIT is the CONSTRUCTOR containing the list of initializers describing
5043 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5044 It may not presently match the shape of the TYPE; for example:
5046 struct S { int a; int b; };
5047 struct S a[] = { 1, 2, 3, 4 };
5049 Here INIT will hold a VEC of four elements, rather than a
5050 VEC of two elements, each itself a VEC of two elements. This
5051 routine transforms INIT from the former form into the latter. The
5052 revised CONSTRUCTOR node is returned. */
5055 reshape_init (tree type, tree init)
5057 VEC(constructor_elt, gc) *v;
5061 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5063 v = CONSTRUCTOR_ELTS (init);
5065 /* An empty constructor does not need reshaping, and it is always a valid
5067 if (VEC_empty (constructor_elt, v))
5070 /* Recurse on this CONSTRUCTOR. */
5071 d.cur = VEC_index (constructor_elt, v, 0);
5072 d.end = d.cur + VEC_length (constructor_elt, v);
5074 new_init = reshape_init_r (type, &d, true);
5075 if (new_init == error_mark_node)
5076 return error_mark_node;
5078 /* Make sure all the element of the constructor were used. Otherwise,
5079 issue an error about exceeding initializers. */
5081 error ("too many initializers for %qT", type);
5086 /* Verify array initializer. Returns true if errors have been reported. */
5089 check_array_initializer (tree decl, tree type, tree init)
5091 tree element_type = TREE_TYPE (type);
5093 /* The array type itself need not be complete, because the
5094 initializer may tell us how many elements are in the array.
5095 But, the elements of the array must be complete. */
5096 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5099 error ("elements of array %q#D have incomplete type", decl);
5101 error ("elements of array %q#T have incomplete type", type);
5104 /* It is not valid to initialize a VLA. */
5106 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5107 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5110 error ("variable-sized object %qD may not be initialized", decl);
5112 error ("variable-sized compound literal");
5118 /* Subroutine of check_initializer; args are passed down from that function.
5119 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5122 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5125 int saved_stmts_are_full_exprs_p = 0;
5126 if (building_stmt_tree ())
5128 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5129 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5131 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5132 if (building_stmt_tree ())
5133 current_stmt_tree ()->stmts_are_full_exprs_p =
5134 saved_stmts_are_full_exprs_p;
5138 /* Verify INIT (the initializer for DECL), and record the
5139 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5140 grok_reference_init.
5142 If the return value is non-NULL, it is an expression that must be
5143 evaluated dynamically to initialize DECL. */
5146 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5148 tree type = TREE_TYPE (decl);
5149 tree init_code = NULL;
5151 /* Things that are going to be initialized need to have complete
5153 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5155 if (type == error_mark_node)
5156 /* We will have already complained. */
5159 if (TREE_CODE (type) == ARRAY_TYPE)
5161 if (check_array_initializer (decl, type, init))
5164 else if (!COMPLETE_TYPE_P (type))
5166 error ("%qD has incomplete type", decl);
5167 TREE_TYPE (decl) = error_mark_node;
5171 /* There is no way to make a variable-sized class type in GNU C++. */
5172 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5174 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5176 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5177 if (SCALAR_TYPE_P (type))
5181 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5182 init = build_zero_init (type, NULL_TREE, false);
5184 else if (init_len != 1)
5186 error ("scalar object %qD requires one element in initializer",
5188 TREE_TYPE (decl) = error_mark_node;
5194 if (TREE_CODE (decl) == CONST_DECL)
5196 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5198 DECL_INITIAL (decl) = init;
5200 gcc_assert (init != NULL_TREE);
5203 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5204 init = grok_reference_init (decl, type, init, cleanup);
5207 /* Do not reshape constructors of vectors (they don't need to be
5209 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5211 if (is_std_init_list (type))
5212 return build_init_list_var_init (decl, type, init, cleanup);
5213 else if (TYPE_NON_AGGREGATE_CLASS (type))
5215 /* Don't reshape if the class has constructors. */
5216 if (cxx_dialect == cxx98)
5217 error ("in C++98 %qD must be initialized by constructor, "
5220 init = build_tree_list (NULL_TREE, init);
5222 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5224 error ("opaque vector types cannot be initialized");
5225 init = error_mark_node;
5228 init = reshape_init (type, init);
5231 /* If DECL has an array type without a specific bound, deduce the
5232 array size from the initializer. */
5233 maybe_deduce_size_from_array_init (decl, init);
5234 type = TREE_TYPE (decl);
5235 if (type == error_mark_node)
5238 if (TYPE_NEEDS_CONSTRUCTING (type)
5239 || (CLASS_TYPE_P (type)
5240 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5241 return build_aggr_init_full_exprs (decl, init, flags);
5242 else if (TREE_CODE (init) != TREE_VEC)
5244 init_code = store_init_value (decl, init, flags);
5245 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5246 && DECL_INITIAL (decl)
5247 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5248 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5249 warning (0, "array %qD initialized by parenthesized string literal %qE",
5250 decl, DECL_INITIAL (decl));
5254 else if (DECL_EXTERNAL (decl))
5256 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5257 return build_aggr_init_full_exprs (decl, init, flags);
5258 else if (MAYBE_CLASS_TYPE_P (type))
5260 tree core_type = strip_array_types (type);
5262 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5263 error ("structure %qD with uninitialized const members", decl);
5264 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5265 error ("structure %qD with uninitialized reference members", decl);
5267 check_for_uninitialized_const_var (decl);
5270 check_for_uninitialized_const_var (decl);
5272 if (init && init != error_mark_node)
5273 init_code = build2 (INIT_EXPR, type, decl, init);
5278 /* If DECL is not a local variable, give it RTL. */
5281 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5283 int toplev = toplevel_bindings_p ();
5285 const char *filename;
5287 /* Set the DECL_ASSEMBLER_NAME for the object. */
5290 /* The `register' keyword, when used together with an
5291 asm-specification, indicates that the variable should be
5292 placed in a particular register. */
5293 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5295 set_user_assembler_name (decl, asmspec);
5296 DECL_HARD_REGISTER (decl) = 1;
5300 if (TREE_CODE (decl) == FUNCTION_DECL
5301 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5302 set_builtin_user_assembler_name (decl, asmspec);
5303 set_user_assembler_name (decl, asmspec);
5307 /* Handle non-variables up front. */
5308 if (TREE_CODE (decl) != VAR_DECL)
5310 rest_of_decl_compilation (decl, toplev, at_eof);
5314 /* If we see a class member here, it should be a static data
5316 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5318 gcc_assert (TREE_STATIC (decl));
5319 /* An in-class declaration of a static data member should be
5320 external; it is only a declaration, and not a definition. */
5321 if (init == NULL_TREE)
5322 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5325 /* We don't create any RTL for local variables. */
5326 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5329 /* We defer emission of local statics until the corresponding
5330 DECL_EXPR is expanded. */
5331 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5333 /* We try to defer namespace-scope static constants so that they are
5334 not emitted into the object file unnecessarily. */
5335 filename = input_filename;
5336 if (!DECL_VIRTUAL_P (decl)
5337 && TREE_READONLY (decl)
5338 && DECL_INITIAL (decl) != NULL_TREE
5339 && DECL_INITIAL (decl) != error_mark_node
5341 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5343 && !TREE_PUBLIC (decl))
5345 /* Fool with the linkage of static consts according to #pragma
5347 struct c_fileinfo *finfo = get_fileinfo (filename);
5348 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5350 TREE_PUBLIC (decl) = 1;
5351 DECL_EXTERNAL (decl) = finfo->interface_only;
5356 /* Likewise for template instantiations. */
5357 else if (DECL_LANG_SPECIFIC (decl)
5358 && DECL_IMPLICIT_INSTANTIATION (decl))
5361 /* If we're not deferring, go ahead and assemble the variable. */
5363 rest_of_decl_compilation (decl, toplev, at_eof);
5366 /* walk_tree helper for wrap_temporary_cleanups, below. */
5369 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5371 if (TYPE_P (*stmt_p))
5377 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5379 tree guard = (tree)data;
5380 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5382 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5383 /* Tell honor_protect_cleanup_actions to handle this as a separate
5385 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5387 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5393 /* We're initializing a local variable which has a cleanup GUARD. If there
5394 are any temporaries used in the initializer INIT of this variable, we
5395 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5396 variable will be cleaned up properly if one of them throws.
5398 Unfortunately, there's no way to express this properly in terms of
5399 nesting, as the regions for the temporaries overlap the region for the
5400 variable itself; if there are two temporaries, the variable needs to be
5401 the first thing destroyed if either of them throws. However, we only
5402 want to run the variable's cleanup if it actually got constructed. So
5403 we need to guard the temporary cleanups with the variable's cleanup if
5404 they are run on the normal path, but not if they are run on the
5405 exceptional path. We implement this by telling
5406 honor_protect_cleanup_actions to strip the variable cleanup from the
5407 exceptional path. */
5410 wrap_temporary_cleanups (tree init, tree guard)
5412 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5415 /* Generate code to initialize DECL (a local variable). */
5418 initialize_local_var (tree decl, tree init)
5420 tree type = TREE_TYPE (decl);
5424 gcc_assert (TREE_CODE (decl) == VAR_DECL
5425 || TREE_CODE (decl) == RESULT_DECL);
5426 gcc_assert (!TREE_STATIC (decl));
5428 if (DECL_SIZE (decl) == NULL_TREE)
5430 /* If we used it already as memory, it must stay in memory. */
5431 DECL_INITIAL (decl) = NULL_TREE;
5432 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5436 if (type == error_mark_node)
5439 /* Compute and store the initial value. */
5440 already_used = TREE_USED (decl) || TREE_USED (type);
5442 /* Generate a cleanup, if necessary. */
5443 cleanup = cxx_maybe_build_cleanup (decl);
5445 /* Perform the initialization. */
5448 int saved_stmts_are_full_exprs_p;
5450 /* If we're only initializing a single object, guard the destructors
5451 of any temporaries used in its initializer with its destructor.
5452 This isn't right for arrays because each element initialization is
5453 a full-expression. */
5454 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5455 wrap_temporary_cleanups (init, cleanup);
5457 gcc_assert (building_stmt_tree ());
5458 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5459 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5460 finish_expr_stmt (init);
5461 current_stmt_tree ()->stmts_are_full_exprs_p =
5462 saved_stmts_are_full_exprs_p;
5465 /* Set this to 0 so we can tell whether an aggregate which was
5466 initialized was ever used. Don't do this if it has a
5467 destructor, so we don't complain about the 'resource
5468 allocation is initialization' idiom. Now set
5469 attribute((unused)) on types so decls of that type will be
5470 marked used. (see TREE_USED, above.) */
5471 if (TYPE_NEEDS_CONSTRUCTING (type)
5473 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5474 && DECL_NAME (decl))
5475 TREE_USED (decl) = 0;
5476 else if (already_used)
5477 TREE_USED (decl) = 1;
5480 finish_decl_cleanup (decl, cleanup);
5483 /* DECL is a VAR_DECL for a compiler-generated variable with static
5484 storage duration (like a virtual table) whose initializer is a
5485 compile-time constant. INIT must be either a TREE_LIST of values,
5486 or a CONSTRUCTOR. Initialize the variable and provide it to the
5490 initialize_artificial_var (tree decl, tree init)
5492 gcc_assert (DECL_ARTIFICIAL (decl));
5493 if (TREE_CODE (init) == TREE_LIST)
5494 init = build_constructor_from_list (TREE_TYPE (decl), init);
5495 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5496 DECL_INITIAL (decl) = init;
5497 DECL_INITIALIZED_P (decl) = 1;
5498 determine_visibility (decl);
5499 layout_var_decl (decl);
5500 maybe_commonize_var (decl);
5501 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5504 /* INIT is the initializer for a variable, as represented by the
5505 parser. Returns true iff INIT is value-dependent. */
5508 value_dependent_init_p (tree init)
5510 if (TREE_CODE (init) == TREE_LIST)
5511 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5512 return any_value_dependent_elements_p (init);
5513 else if (TREE_CODE (init) == CONSTRUCTOR)
5514 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5516 VEC(constructor_elt, gc) *elts;
5520 elts = CONSTRUCTOR_ELTS (init);
5521 nelts = VEC_length (constructor_elt, elts);
5522 for (i = 0; i < nelts; ++i)
5523 if (value_dependent_init_p (VEC_index (constructor_elt,
5528 /* It must be a simple expression, e.g., int i = 3; */
5529 return value_dependent_expression_p (init);
5534 /* Finish processing of a declaration;
5535 install its line number and initial value.
5536 If the length of an array type is not known before,
5537 it must be determined now, from the initial value, or it is an error.
5539 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5540 true, then INIT is an integral constant expression.
5542 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5543 if the (init) syntax was used. */
5546 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5547 tree asmspec_tree, int flags)
5551 const char *asmspec = NULL;
5552 int was_readonly = 0;
5553 bool var_definition_p = false;
5554 int saved_processing_template_decl;
5557 if (decl == error_mark_node)
5562 error ("assignment (not initialization) in declaration");
5566 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5567 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5568 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5570 type = TREE_TYPE (decl);
5571 if (type == error_mark_node)
5574 /* Assume no cleanup is required. */
5575 cleanup = NULL_TREE;
5576 saved_processing_template_decl = processing_template_decl;
5578 /* If a name was specified, get the string. */
5579 if (global_scope_p (current_binding_level))
5580 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5581 if (asmspec_tree && asmspec_tree != error_mark_node)
5582 asmspec = TREE_STRING_POINTER (asmspec_tree);
5584 if (current_class_type
5585 && CP_DECL_CONTEXT (decl) == current_class_type
5586 && TYPE_BEING_DEFINED (current_class_type)
5587 && (DECL_INITIAL (decl) || init))
5588 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5590 auto_node = type_uses_auto (type);
5593 if (init == NULL_TREE)
5595 error ("declaration of %q#D has no initializer", decl);
5596 TREE_TYPE (decl) = error_mark_node;
5599 if (TREE_CODE (init) == TREE_LIST)
5600 init = build_x_compound_expr_from_list (init, "initializer");
5601 if (describable_type (init))
5603 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5604 if (type == error_mark_node)
5609 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5612 if (init == ridpointers[(int)RID_DELETE])
5614 /* FIXME check this is 1st decl. */
5615 DECL_DELETED_FN (decl) = 1;
5616 DECL_DECLARED_INLINE_P (decl) = 1;
5617 DECL_INITIAL (decl) = error_mark_node;
5618 FOR_EACH_CLONE (clone, decl)
5620 DECL_DELETED_FN (clone) = 1;
5621 DECL_DECLARED_INLINE_P (clone) = 1;
5622 DECL_INITIAL (clone) = error_mark_node;
5626 else if (init == ridpointers[(int)RID_DEFAULT])
5628 if (defaultable_fn_check (decl))
5629 DECL_DEFAULTED_FN (decl) = 1;
5631 DECL_INITIAL (decl) = NULL_TREE;
5635 if (processing_template_decl)
5637 bool type_dependent_p;
5639 /* Add this declaration to the statement-tree. */
5640 if (at_function_scope_p ())
5641 add_decl_expr (decl);
5643 type_dependent_p = dependent_type_p (type);
5645 if (check_for_bare_parameter_packs (init))
5648 DECL_INITIAL (decl) = NULL_TREE;
5651 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5653 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5654 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5655 TREE_CONSTANT (decl) = 1;
5658 /* Generally, initializers in templates are expanded when the
5659 template is instantiated. But, if DECL is an integral
5660 constant static data member, then it can be used in future
5661 integral constant expressions, and its value must be
5664 && DECL_CLASS_SCOPE_P (decl)
5665 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5666 && !type_dependent_p
5667 && !value_dependent_init_p (init)))
5670 DECL_INITIAL (decl) = init;
5671 if (TREE_CODE (decl) == VAR_DECL
5672 && !DECL_PRETTY_FUNCTION_P (decl)
5673 && !type_dependent_p)
5674 maybe_deduce_size_from_array_init (decl, init);
5678 if (TREE_CODE (init) == TREE_LIST)
5680 /* If the parenthesized-initializer form was used (e.g.,
5681 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5682 arguments. (There is generally only one.) We convert them
5685 for (; list; list = TREE_CHAIN (list))
5687 tree elt = TREE_VALUE (list);
5688 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5692 init = fold_non_dependent_expr (init);
5693 processing_template_decl = 0;
5696 /* Take care of TYPE_DECLs up front. */
5697 if (TREE_CODE (decl) == TYPE_DECL)
5699 if (type != error_mark_node
5700 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5702 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5703 warning (0, "shadowing previous type declaration of %q#D", decl);
5704 set_identifier_type_value (DECL_NAME (decl), decl);
5707 /* If we have installed this as the canonical typedef for this
5708 type, and that type has not been defined yet, delay emitting
5709 the debug information for it, as we will emit it later. */
5710 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5711 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5712 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5714 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5719 /* A reference will be modified here, as it is initialized. */
5720 if (! DECL_EXTERNAL (decl)
5721 && TREE_READONLY (decl)
5722 && TREE_CODE (type) == REFERENCE_TYPE)
5725 TREE_READONLY (decl) = 0;
5728 if (TREE_CODE (decl) == VAR_DECL)
5730 /* Only variables with trivial initialization and destruction can
5731 have thread-local storage. */
5732 if (DECL_THREAD_LOCAL_P (decl)
5733 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5734 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5735 error ("%qD cannot be thread-local because it has non-trivial "
5736 "type %qT", decl, TREE_TYPE (decl));
5737 /* If this is a local variable that will need a mangled name,
5738 register it now. We must do this before processing the
5739 initializer for the variable, since the initialization might
5740 require a guard variable, and since the mangled name of the
5741 guard variable will depend on the mangled name of this
5743 if (DECL_FUNCTION_SCOPE_P (decl)
5744 && TREE_STATIC (decl)
5745 && !DECL_ARTIFICIAL (decl))
5747 push_local_name (decl);
5748 if (DECL_CONSTRUCTOR_P (current_function_decl)
5749 || DECL_DESTRUCTOR_P (current_function_decl))
5750 /* Normally local_decls is populated during GIMPLE lowering,
5751 but [cd]tors are never actually compiled directly. We need
5752 to put statics on the list so we can deal with the label
5753 address extension. */
5754 cfun->local_decls = tree_cons (NULL_TREE, decl,
5758 /* Convert the initializer to the type of DECL, if we have not
5759 already initialized DECL. */
5760 if (!DECL_INITIALIZED_P (decl)
5761 /* If !DECL_EXTERNAL then DECL is being defined. In the
5762 case of a static data member initialized inside the
5763 class-specifier, there can be an initializer even if DECL
5764 is *not* defined. */
5765 && (!DECL_EXTERNAL (decl) || init))
5767 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5770 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5771 /* Allow libjava/prims.cc define primitive classes. */
5772 if (init != NULL_TREE
5773 || jclass == NULL_TREE
5774 || TREE_CODE (jclass) != TYPE_DECL
5775 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5776 || !same_type_ignoring_top_level_qualifiers_p
5777 (type, TREE_TYPE (TREE_TYPE (jclass))))
5778 error ("Java object %qD not allocated with %<new%>", decl);
5783 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5784 if (init_const_expr_p)
5786 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5787 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5788 TREE_CONSTANT (decl) = 1;
5791 init = check_initializer (decl, init, flags, &cleanup);
5792 /* Thread-local storage cannot be dynamically initialized. */
5793 if (DECL_THREAD_LOCAL_P (decl) && init)
5795 error ("%qD is thread-local and so cannot be dynamically "
5796 "initialized", decl);
5800 /* Check that the initializer for a static data member was a
5801 constant. Although we check in the parser that the
5802 initializer is an integral constant expression, we do not
5803 simplify division-by-zero at the point at which it
5804 occurs. Therefore, in:
5806 struct S { static const int i = 7 / 0; };
5808 we issue an error at this point. It would
5809 probably be better to forbid division by zero in
5810 integral constant expressions. */
5811 if (DECL_EXTERNAL (decl) && init)
5813 error ("%qD cannot be initialized by a non-constant expression"
5814 " when being declared", decl);
5815 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5823 The memory occupied by any object of static storage
5824 duration is zero-initialized at program startup before
5825 any other initialization takes place.
5827 We cannot create an appropriate initializer until after
5828 the type of DECL is finalized. If DECL_INITIAL is set,
5829 then the DECL is statically initialized, and any
5830 necessary zero-initialization has already been performed. */
5831 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5832 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5833 /*nelts=*/NULL_TREE,
5834 /*static_storage_p=*/true);
5835 /* Remember that the initialization for this variable has
5837 DECL_INITIALIZED_P (decl) = 1;
5838 /* This declaration is the definition of this variable,
5839 unless we are initializing a static data member within
5840 the class specifier. */
5841 if (!DECL_EXTERNAL (decl))
5842 var_definition_p = true;
5844 /* If the variable has an array type, lay out the type, even if
5845 there is no initializer. It is valid to index through the
5846 array, and we must get TYPE_ALIGN set correctly on the array
5848 else if (TREE_CODE (type) == ARRAY_TYPE)
5851 if (!processing_template_decl
5852 && TREE_STATIC (decl)
5853 && !at_function_scope_p ()
5854 && current_function_decl == NULL)
5855 /* So decl is a global variable or a static member of a
5856 non local class. Record the types it uses
5857 so that we can decide later to emit debug info for them. */
5858 record_types_used_by_current_var_decl (decl);
5860 else if (TREE_CODE (decl) == FIELD_DECL
5861 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5862 error ("non-static data member %qD has Java class type", decl);
5864 /* Add this declaration to the statement-tree. This needs to happen
5865 after the call to check_initializer so that the DECL_EXPR for a
5866 reference temp is added before the DECL_EXPR for the reference itself. */
5867 if (at_function_scope_p ())
5868 add_decl_expr (decl);
5870 /* Let the middle end know about variables and functions -- but not
5871 static data members in uninstantiated class templates. */
5872 if (!saved_processing_template_decl
5873 && (TREE_CODE (decl) == VAR_DECL
5874 || TREE_CODE (decl) == FUNCTION_DECL))
5876 if (TREE_CODE (decl) == VAR_DECL)
5878 layout_var_decl (decl);
5879 maybe_commonize_var (decl);
5882 /* This needs to happen after the linkage is set. */
5883 determine_visibility (decl);
5885 if (var_definition_p && TREE_STATIC (decl))
5887 /* If a TREE_READONLY variable needs initialization
5888 at runtime, it is no longer readonly and we need to
5889 avoid MEM_READONLY_P being set on RTL created for it. */
5892 if (TREE_READONLY (decl))
5893 TREE_READONLY (decl) = 0;
5896 else if (was_readonly)
5897 TREE_READONLY (decl) = 1;
5900 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5902 /* Check for abstractness of the type. Notice that there is no
5903 need to strip array types here since the check for those types
5904 is already done within create_array_type_for_decl. */
5905 if (TREE_CODE (type) == FUNCTION_TYPE
5906 || TREE_CODE (type) == METHOD_TYPE)
5907 abstract_virtuals_error (decl, TREE_TYPE (type));
5909 abstract_virtuals_error (decl, type);
5911 if (TREE_TYPE (decl) == error_mark_node)
5912 /* No initialization required. */
5914 else if (TREE_CODE (decl) == FUNCTION_DECL)
5918 if (init == ridpointers[(int)RID_DEFAULT])
5920 /* An out-of-class default definition is defined at
5921 the point where it is explicitly defaulted. */
5922 if (DECL_INITIAL (decl) == error_mark_node)
5923 synthesize_method (decl);
5926 error ("function %q#D is initialized like a variable", decl);
5928 /* else no initialization required. */
5930 else if (DECL_EXTERNAL (decl)
5931 && ! (DECL_LANG_SPECIFIC (decl)
5932 && DECL_NOT_REALLY_EXTERN (decl)))
5935 DECL_INITIAL (decl) = init;
5937 /* A variable definition. */
5938 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5939 /* Initialize the local variable. */
5940 initialize_local_var (decl, init);
5942 /* If a variable is defined, and then a subsequent
5943 definition with external linkage is encountered, we will
5944 get here twice for the same variable. We want to avoid
5945 calling expand_static_init more than once. For variables
5946 that are not static data members, we can call
5947 expand_static_init only when we actually process the
5948 initializer. It is not legal to redeclare a static data
5949 member, so this issue does not arise in that case. */
5950 else if (var_definition_p && TREE_STATIC (decl))
5951 expand_static_init (decl, init);
5954 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5955 reference, insert it in the statement-tree now. */
5957 push_cleanup (decl, cleanup, false);
5960 processing_template_decl = saved_processing_template_decl;
5963 TREE_READONLY (decl) = 1;
5965 /* If this was marked 'used', be sure it will be output. */
5966 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5967 mark_decl_referenced (decl);
5970 /* Returns a declaration for a VAR_DECL as if:
5972 extern "C" TYPE NAME;
5974 had been seen. Used to create compiler-generated global
5978 declare_global_var (tree name, tree type)
5982 push_to_top_level ();
5983 decl = build_decl (input_location, VAR_DECL, name, type);
5984 TREE_PUBLIC (decl) = 1;
5985 DECL_EXTERNAL (decl) = 1;
5986 DECL_ARTIFICIAL (decl) = 1;
5987 /* If the user has explicitly declared this variable (perhaps
5988 because the code we are compiling is part of a low-level runtime
5989 library), then it is possible that our declaration will be merged
5990 with theirs by pushdecl. */
5991 decl = pushdecl (decl);
5992 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
5993 pop_from_top_level ();
5998 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5999 if "__cxa_atexit" is not being used) corresponding to the function
6000 to be called when the program exits. */
6003 get_atexit_fn_ptr_type (void)
6008 if (!atexit_fn_ptr_type_node)
6010 if (flag_use_cxa_atexit
6011 && !targetm.cxx.use_atexit_for_cxa_atexit ())
6012 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
6013 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6015 /* The parameter to "atexit" is "void (*)(void)". */
6016 arg_types = void_list_node;
6018 fn_type = build_function_type (void_type_node, arg_types);
6019 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6022 return atexit_fn_ptr_type_node;
6025 /* Returns a pointer to the `atexit' function. Note that if
6026 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6027 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6030 get_atexit_node (void)
6037 bool use_aeabi_atexit;
6042 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6044 /* The declaration for `__cxa_atexit' is:
6046 int __cxa_atexit (void (*)(void *), void *, void *)
6048 We build up the argument types and then then function type
6051 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6052 /* First, build the pointer-to-function type for the first
6054 fn_ptr_type = get_atexit_fn_ptr_type ();
6055 /* Then, build the rest of the argument types. */
6056 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6057 if (use_aeabi_atexit)
6059 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6060 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6064 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6065 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6067 /* And the final __cxa_atexit type. */
6068 fn_type = build_function_type (integer_type_node, arg_types);
6069 fn_ptr_type = build_pointer_type (fn_type);
6070 if (use_aeabi_atexit)
6071 name = "__aeabi_atexit";
6073 name = "__cxa_atexit";
6077 /* The declaration for `atexit' is:
6079 int atexit (void (*)());
6081 We build up the argument types and then then function type
6083 fn_ptr_type = get_atexit_fn_ptr_type ();
6084 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
6085 /* Build the final atexit type. */
6086 fn_type = build_function_type (integer_type_node, arg_types);
6090 /* Now, build the function declaration. */
6091 push_lang_context (lang_name_c);
6092 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6093 mark_used (atexit_fndecl);
6094 pop_lang_context ();
6095 atexit_node = decay_conversion (atexit_fndecl);
6100 /* Returns the __dso_handle VAR_DECL. */
6103 get_dso_handle_node (void)
6105 if (dso_handle_node)
6106 return dso_handle_node;
6108 /* Declare the variable. */
6109 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6112 return dso_handle_node;
6115 /* Begin a new function with internal linkage whose job will be simply
6116 to destroy some particular variable. */
6118 static GTY(()) int start_cleanup_cnt;
6121 start_cleanup_fn (void)
6126 bool use_cxa_atexit = flag_use_cxa_atexit
6127 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6129 push_to_top_level ();
6131 /* No need to mangle this. */
6132 push_lang_context (lang_name_c);
6134 /* Build the name of the function. */
6135 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6136 /* Build the function declaration. */
6137 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6138 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6139 /* It's a function with internal linkage, generated by the
6141 TREE_PUBLIC (fndecl) = 0;
6142 DECL_ARTIFICIAL (fndecl) = 1;
6143 /* Make the function `inline' so that it is only emitted if it is
6144 actually needed. It is unlikely that it will be inlined, since
6145 it is only called via a function pointer, but we avoid unnecessary
6146 emissions this way. */
6147 DECL_DECLARED_INLINE_P (fndecl) = 1;
6148 DECL_INTERFACE_KNOWN (fndecl) = 1;
6149 /* Build the parameter. */
6154 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6155 DECL_CONTEXT (parmdecl) = fndecl;
6156 TREE_USED (parmdecl) = 1;
6157 DECL_ARGUMENTS (fndecl) = parmdecl;
6161 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6163 pop_lang_context ();
6165 return current_function_decl;
6168 /* Finish the cleanup function begun by start_cleanup_fn. */
6171 end_cleanup_fn (void)
6173 expand_or_defer_fn (finish_function (0));
6175 pop_from_top_level ();
6178 /* Generate code to handle the destruction of DECL, an object with
6179 static storage duration. */
6182 register_dtor_fn (tree decl)
6191 type = TREE_TYPE (decl);
6192 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6193 return void_zero_node;
6195 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6196 a class object, we can just pass the destructor to
6197 "__cxa_atexit"; we don't have to build a temporary function to do
6199 use_dtor = (flag_use_cxa_atexit
6200 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6201 && CLASS_TYPE_P (type));
6206 /* Find the destructor. */
6207 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6208 gcc_assert (idx >= 0);
6209 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6210 /* Make sure it is accessible. */
6211 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6215 /* Call build_cleanup before we enter the anonymous function so
6216 that any access checks will be done relative to the current
6217 scope, rather than the scope of the anonymous function. */
6218 build_cleanup (decl);
6220 /* Now start the function. */
6221 cleanup = start_cleanup_fn ();
6223 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6224 to the original function, rather than the anonymous one. That
6225 will make the back end think that nested functions are in use,
6226 which causes confusion. */
6227 push_deferring_access_checks (dk_no_check);
6228 fcall = build_cleanup (decl);
6229 pop_deferring_access_checks ();
6231 /* Create the body of the anonymous function. */
6232 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6233 finish_expr_stmt (fcall);
6234 finish_compound_stmt (compound_stmt);
6238 /* Call atexit with the cleanup function. */
6239 mark_used (cleanup);
6240 cleanup = build_address (cleanup);
6241 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6247 /* We must convert CLEANUP to the type that "__cxa_atexit"
6249 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6250 /* "__cxa_atexit" will pass the address of DECL to the
6251 cleanup function. */
6253 addr = build_address (decl);
6254 /* The declared type of the parameter to "__cxa_atexit" is
6255 "void *". For plain "T*", we could just let the
6256 machinery in cp_build_function_call convert it -- but if the
6257 type is "cv-qualified T *", then we need to convert it
6258 before passing it in, to avoid spurious errors. */
6259 addr = build_nop (ptr_type_node, addr);
6262 /* Since the cleanup functions we build ignore the address
6263 they're given, there's no reason to pass the actual address
6264 in, and, in general, it's cheaper to pass NULL than any
6266 addr = null_pointer_node;
6267 args = tree_cons (NULL_TREE,
6268 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6269 tf_warning_or_error),
6271 if (targetm.cxx.use_aeabi_atexit ())
6273 args = tree_cons (NULL_TREE, cleanup, args);
6274 args = tree_cons (NULL_TREE, addr, args);
6278 args = tree_cons (NULL_TREE, addr, args);
6279 args = tree_cons (NULL_TREE, cleanup, args);
6283 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6284 return cp_build_function_call (get_atexit_node (), args,
6285 tf_warning_or_error);
6288 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6289 is its initializer. Generate code to handle the construction
6290 and destruction of DECL. */
6293 expand_static_init (tree decl, tree init)
6295 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6296 gcc_assert (TREE_STATIC (decl));
6298 /* Some variables require no initialization. */
6300 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6301 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6304 if (DECL_FUNCTION_SCOPE_P (decl))
6306 /* Emit code to perform this initialization but once. */
6307 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6308 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6309 tree guard, guard_addr;
6310 tree acquire_fn, release_fn, abort_fn;
6313 /* Emit code to perform this initialization but once. This code
6316 static <type> guard;
6317 if (!guard.first_byte) {
6318 if (__cxa_guard_acquire (&guard)) {
6321 // Do initialization.
6322 flag = true; __cxa_guard_release (&guard);
6323 // Register variable for destruction at end of program.
6325 if (!flag) __cxa_guard_abort (&guard);
6329 Note that the `flag' variable is only set to 1 *after* the
6330 initialization is complete. This ensures that an exception,
6331 thrown during the construction, will cause the variable to
6332 reinitialized when we pass through this code again, as per:
6336 If the initialization exits by throwing an exception, the
6337 initialization is not complete, so it will be tried again
6338 the next time control enters the declaration.
6340 This process should be thread-safe, too; multiple threads
6341 should not be able to initialize the variable more than
6344 /* Create the guard variable. */
6345 guard = get_guard (decl);
6347 /* This optimization isn't safe on targets with relaxed memory
6348 consistency. On such targets we force synchronization in
6349 __cxa_guard_acquire. */
6350 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6352 /* Begin the conditional initialization. */
6353 if_stmt = begin_if_stmt ();
6354 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6355 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6358 if (flag_threadsafe_statics)
6360 guard_addr = build_address (guard);
6362 acquire_fn = get_identifier ("__cxa_guard_acquire");
6363 release_fn = get_identifier ("__cxa_guard_release");
6364 abort_fn = get_identifier ("__cxa_guard_abort");
6365 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6367 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6369 tree vfntype = build_function_type (void_type_node, argtypes);
6370 acquire_fn = push_library_fn
6371 (acquire_fn, build_function_type (integer_type_node, argtypes),
6373 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6374 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6378 release_fn = identifier_global_value (release_fn);
6379 abort_fn = identifier_global_value (abort_fn);
6382 inner_if_stmt = begin_if_stmt ();
6383 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6386 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6387 begin = get_target_expr (boolean_false_node);
6388 flag = TARGET_EXPR_SLOT (begin);
6390 TARGET_EXPR_CLEANUP (begin)
6391 = build3 (COND_EXPR, void_type_node, flag,
6393 build_call_n (abort_fn, 1, guard_addr));
6394 CLEANUP_EH_ONLY (begin) = 1;
6396 /* Do the initialization itself. */
6397 init = add_stmt_to_compound (begin, init);
6398 init = add_stmt_to_compound
6399 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6400 init = add_stmt_to_compound
6401 (init, build_call_n (release_fn, 1, guard_addr));
6404 init = add_stmt_to_compound (init, set_guard (guard));
6406 /* Use atexit to register a function for destroying this static
6408 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6410 finish_expr_stmt (init);
6412 if (flag_threadsafe_statics)
6414 finish_compound_stmt (inner_then_clause);
6415 finish_then_clause (inner_if_stmt);
6416 finish_if_stmt (inner_if_stmt);
6419 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6421 finish_compound_stmt (then_clause);
6422 finish_then_clause (if_stmt);
6423 finish_if_stmt (if_stmt);
6427 static_aggregates = tree_cons (init, decl, static_aggregates);
6431 /* Make TYPE a complete type based on INITIAL_VALUE.
6432 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6433 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6434 3 if the initializer list is empty (in pedantic mode). */
6437 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6440 tree type, elt_type;
6444 unsigned HOST_WIDE_INT i;
6447 /* An array of character type can be initialized from a
6448 brace-enclosed string constant.
6450 FIXME: this code is duplicated from reshape_init. Probably
6451 we should just call reshape_init here? */
6452 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6453 && TREE_CODE (initial_value) == CONSTRUCTOR
6454 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6456 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6457 tree value = VEC_index (constructor_elt, v, 0)->value;
6459 if (TREE_CODE (value) == STRING_CST
6460 && VEC_length (constructor_elt, v) == 1)
6461 initial_value = value;
6464 /* If any of the elements are parameter packs, we can't actually
6465 complete this type now because the array size is dependent. */
6466 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6468 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6471 if (PACK_EXPANSION_P (value))
6477 failure = complete_array_type (ptype, initial_value, do_default);
6479 /* We can create the array before the element type is complete, which
6480 means that we didn't have these two bits set in the original type
6481 either. In completing the type, we are expected to propagate these
6482 bits. See also complete_type which does the same thing for arrays
6485 if (TYPE_DOMAIN (type))
6487 elt_type = TREE_TYPE (type);
6488 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6489 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6490 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6496 /* Return zero if something is declared to be a member of type
6497 CTYPE when in the context of CUR_TYPE. STRING is the error
6498 message to print in that case. Otherwise, quietly return 1. */
6501 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6503 if (ctype && ctype != cur_type)
6505 if (flags == DTOR_FLAG)
6506 error ("destructor for alien class %qT cannot be a member", ctype);
6508 error ("constructor for alien class %qT cannot be a member", ctype);
6514 /* Subroutine of `grokdeclarator'. */
6516 /* Generate errors possibly applicable for a given set of specifiers.
6517 This is for ARM $7.1.2. */
6520 bad_specifiers (tree object,
6529 error ("%qD declared as a %<virtual%> %s", object, type);
6531 error ("%qD declared as an %<inline%> %s", object, type);
6533 error ("%<const%> and %<volatile%> function specifiers on "
6534 "%qD invalid in %s declaration",
6537 error ("%q+D declared as a friend", object);
6539 && (TREE_CODE (object) == TYPE_DECL
6540 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6541 && !TYPE_REFFN_P (TREE_TYPE (object))
6542 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6543 error ("%q+D declared with an exception specification", object);
6546 /* DECL is a member function or static data member and is presently
6547 being defined. Check that the definition is taking place in a
6551 check_class_member_definition_namespace (tree decl)
6553 /* These checks only apply to member functions and static data
6555 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6556 || TREE_CODE (decl) == VAR_DECL);
6557 /* We check for problems with specializations in pt.c in
6558 check_specialization_namespace, where we can issue better
6560 if (processing_specialization)
6562 /* There are no restrictions on the placement of
6563 explicit instantiations. */
6564 if (processing_explicit_instantiation)
6568 A member function definition that appears outside of the
6569 class definition shall appear in a namespace scope enclosing
6570 the class definition.
6574 The definition for a static data member shall appear in a
6575 namespace scope enclosing the member's class definition. */
6576 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6577 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6578 decl, DECL_CONTEXT (decl));
6581 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6582 METHOD_TYPE for a non-static member function; QUALS are the
6583 cv-qualifiers that apply to the function. */
6586 build_this_parm (tree type, cp_cv_quals quals)
6591 cp_cv_quals this_quals;
6593 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6594 /* The `this' parameter is implicitly `const'; it cannot be
6596 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6597 qual_type = cp_build_qualified_type (this_type, this_quals);
6598 parm = build_artificial_parm (this_identifier, qual_type);
6599 cp_apply_type_quals_to_decl (this_quals, parm);
6603 /* CTYPE is class type, or null if non-class.
6604 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6606 DECLARATOR is the function's name.
6607 PARMS is a chain of PARM_DECLs for the function.
6608 VIRTUALP is truthvalue of whether the function is virtual or not.
6609 FLAGS are to be passed through to `grokclassfn'.
6610 QUALS are qualifiers indicating whether the function is `const'
6612 RAISES is a list of exceptions that this function can raise.
6613 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6614 not look, and -1 if we should not call `grokclassfn' at all.
6616 SFK is the kind of special function (if any) for the new function.
6618 Returns `NULL_TREE' if something goes wrong, after issuing
6619 applicable error messages. */
6622 grokfndecl (tree ctype,
6626 tree orig_declarator,
6628 enum overload_flags flags,
6635 special_function_kind sfk,
6640 location_t location)
6643 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6647 type = build_exception_variant (type, raises);
6649 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6651 /* If we have an explicit location, use it, otherwise use whatever
6652 build_lang_decl used (probably input_location). */
6653 if (location != UNKNOWN_LOCATION)
6654 DECL_SOURCE_LOCATION (decl) = location;
6656 if (TREE_CODE (type) == METHOD_TYPE)
6659 parm = build_this_parm (type, quals);
6660 TREE_CHAIN (parm) = parms;
6663 DECL_ARGUMENTS (decl) = parms;
6664 for (t = parms; t; t = TREE_CHAIN (t))
6665 DECL_CONTEXT (t) = decl;
6666 /* Propagate volatile out from type to decl. */
6667 if (TYPE_VOLATILE (type))
6668 TREE_THIS_VOLATILE (decl) = 1;
6670 /* Setup decl according to sfk. */
6673 case sfk_constructor:
6674 case sfk_copy_constructor:
6675 case sfk_move_constructor:
6676 DECL_CONSTRUCTOR_P (decl) = 1;
6678 case sfk_destructor:
6679 DECL_DESTRUCTOR_P (decl) = 1;
6685 /* If pointers to member functions use the least significant bit to
6686 indicate whether a function is virtual, ensure a pointer
6687 to this function will have that bit clear. */
6688 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6689 && TREE_CODE (type) == METHOD_TYPE
6690 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6691 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6694 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6698 ("defining explicit specialization %qD in friend declaration",
6702 tree fns = TREE_OPERAND (orig_declarator, 0);
6703 tree args = TREE_OPERAND (orig_declarator, 1);
6705 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6707 /* Something like `template <class T> friend void f<T>()'. */
6708 error ("invalid use of template-id %qD in declaration "
6709 "of primary template",
6715 /* A friend declaration of the form friend void f<>(). Record
6716 the information in the TEMPLATE_ID_EXPR. */
6717 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6719 if (TREE_CODE (fns) == COMPONENT_REF)
6721 /* Due to bison parser ickiness, we will have already looked
6722 up an operator_name or PFUNCNAME within the current class
6723 (see template_id in parse.y). If the current class contains
6724 such a name, we'll get a COMPONENT_REF here. Undo that. */
6726 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6727 == current_class_type);
6728 fns = TREE_OPERAND (fns, 1);
6730 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6731 || TREE_CODE (fns) == OVERLOAD);
6732 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6734 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6735 if (TREE_PURPOSE (t)
6736 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6738 error ("default arguments are not allowed in declaration "
6739 "of friend template specialization %qD",
6746 error ("%<inline%> is not allowed in declaration of friend "
6747 "template specialization %qD",
6754 /* If this decl has namespace scope, set that up. */
6756 set_decl_namespace (decl, in_namespace, friendp);
6758 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6760 /* `main' and builtins have implicit 'C' linkage. */
6761 if ((MAIN_NAME_P (declarator)
6762 || (IDENTIFIER_LENGTH (declarator) > 10
6763 && IDENTIFIER_POINTER (declarator)[0] == '_'
6764 && IDENTIFIER_POINTER (declarator)[1] == '_'
6765 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6766 && current_lang_name == lang_name_cplusplus
6767 && ctype == NULL_TREE
6768 /* NULL_TREE means global namespace. */
6769 && DECL_CONTEXT (decl) == NULL_TREE)
6770 SET_DECL_LANGUAGE (decl, lang_c);
6772 /* Should probably propagate const out from type to decl I bet (mrs). */
6775 DECL_STATIC_FUNCTION_P (decl) = 1;
6776 DECL_CONTEXT (decl) = ctype;
6781 DECL_CONTEXT (decl) = ctype;
6783 check_class_member_definition_namespace (decl);
6786 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6788 if (processing_template_decl)
6789 error ("cannot declare %<::main%> to be a template");
6791 error ("cannot declare %<::main%> to be inline");
6793 error ("cannot declare %<::main%> to be static");
6798 /* Members of anonymous types and local classes have no linkage; make
6799 them internal. If a typedef is made later, this will be changed. */
6800 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6801 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6804 if (publicp && cxx_dialect == cxx98)
6806 /* [basic.link]: A name with no linkage (notably, the name of a class
6807 or enumeration declared in a local scope) shall not be used to
6808 declare an entity with linkage.
6810 DR 757 relaxes this restriction for C++0x. */
6811 t = no_linkage_check (TREE_TYPE (decl),
6812 /*relaxed_p=*/false);
6815 if (TYPE_ANONYMOUS_P (t))
6817 if (DECL_EXTERN_C_P (decl))
6818 /* Allow this; it's pretty common in C. */;
6821 permerror (input_location, "non-local function %q#D uses anonymous type",
6823 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6824 permerror (input_location, "%q+#D does not refer to the unqualified "
6825 "type, so it is not used for linkage",
6830 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6834 TREE_PUBLIC (decl) = publicp;
6837 DECL_INTERFACE_KNOWN (decl) = 1;
6838 DECL_NOT_REALLY_EXTERN (decl) = 1;
6841 /* If the declaration was declared inline, mark it as such. */
6843 DECL_DECLARED_INLINE_P (decl) = 1;
6845 DECL_EXTERNAL (decl) = 1;
6846 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6849 ? G_("static member function %qD cannot have cv-qualifier")
6850 : G_("non-member function %qD cannot have cv-qualifier"),
6852 quals = TYPE_UNQUALIFIED;
6855 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6856 && !grok_op_properties (decl, /*complain=*/true))
6860 /* Make the init_value nonzero so pushdecl knows this is not
6861 tentative. error_mark_node is replaced later with the BLOCK. */
6862 DECL_INITIAL (decl) = error_mark_node;
6864 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6865 TREE_NOTHROW (decl) = 1;
6867 /* Caller will do the rest of this. */
6871 if (ctype != NULL_TREE)
6872 grokclassfn (ctype, decl, flags);
6874 decl = check_explicit_specialization (orig_declarator, decl,
6877 4 * (friendp != 0));
6878 if (decl == error_mark_node)
6883 cplus_decl_attributes (&decl, *attrlist, 0);
6884 *attrlist = NULL_TREE;
6887 /* Check main's type after attributes have been applied. */
6888 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6890 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6893 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6895 error ("%<::main%> must return %<int%>");
6896 newtype = build_function_type (integer_type_node, oldtypeargs);
6897 TREE_TYPE (decl) = newtype;
6900 check_main_parameter_types (decl);
6903 if (ctype != NULL_TREE
6904 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6907 tree old_decl = check_classfn (ctype, decl,
6908 (processing_template_decl
6909 > template_class_depth (ctype))
6910 ? current_template_parms
6913 if (old_decl == error_mark_node)
6921 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6922 /* Because grokfndecl is always supposed to return a
6923 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6924 here. We depend on our callers to figure out that its
6925 really a template that's being returned. */
6926 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6928 if (DECL_STATIC_FUNCTION_P (old_decl)
6929 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6930 /* Remove the `this' parm added by grokclassfn.
6931 XXX Isn't this done in start_function, too? */
6932 revert_static_member_fn (decl);
6933 if (DECL_ARTIFICIAL (old_decl))
6935 error ("definition of implicitly-declared %qD", old_decl);
6939 /* Since we've smashed OLD_DECL to its
6940 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6941 if (TREE_CODE (decl) == TEMPLATE_DECL)
6942 decl = DECL_TEMPLATE_RESULT (decl);
6944 /* Attempt to merge the declarations. This can fail, in
6945 the case of some invalid specialization declarations. */
6946 pushed_scope = push_scope (ctype);
6947 ok = duplicate_decls (decl, old_decl, friendp);
6949 pop_scope (pushed_scope);
6952 error ("no %q#D member function declared in class %qT",
6960 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6963 if (ctype == NULL_TREE || check)
6967 DECL_VIRTUAL_P (decl) = 1;
6972 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6973 the linkage that DECL will receive in the object file. */
6976 set_linkage_for_static_data_member (tree decl)
6978 /* A static data member always has static storage duration and
6979 external linkage. Note that static data members are forbidden in
6980 local classes -- the only situation in which a class has
6981 non-external linkage. */
6982 TREE_PUBLIC (decl) = 1;
6983 TREE_STATIC (decl) = 1;
6984 /* For non-template classes, static data members are always put
6985 out in exactly those files where they are defined, just as
6986 with ordinary namespace-scope variables. */
6987 if (!processing_template_decl)
6988 DECL_INTERFACE_KNOWN (decl) = 1;
6991 /* Create a VAR_DECL named NAME with the indicated TYPE.
6993 If SCOPE is non-NULL, it is the class type or namespace containing
6994 the variable. If SCOPE is NULL, the variable should is created in
6995 the innermost enclosings scope. */
6998 grokvardecl (tree type,
7000 const cp_decl_specifier_seq *declspecs,
7006 tree explicit_scope;
7008 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
7010 /* Compute the scope in which to place the variable, but remember
7011 whether or not that scope was explicitly specified by the user. */
7012 explicit_scope = scope;
7015 /* An explicit "extern" specifier indicates a namespace-scope
7017 if (declspecs->storage_class == sc_extern)
7018 scope = current_namespace;
7019 else if (!at_function_scope_p ())
7020 scope = current_scope ();
7024 && (/* If the variable is a namespace-scope variable declared in a
7025 template, we need DECL_LANG_SPECIFIC. */
7026 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7027 /* Similarly for namespace-scope variables with language linkage
7029 || (TREE_CODE (scope) == NAMESPACE_DECL
7030 && current_lang_name != lang_name_cplusplus)
7031 /* Similarly for static data members. */
7033 decl = build_lang_decl (VAR_DECL, name, type);
7035 decl = build_decl (input_location, VAR_DECL, name, type);
7037 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7038 set_decl_namespace (decl, explicit_scope, 0);
7040 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7042 if (declspecs->storage_class == sc_extern)
7044 DECL_THIS_EXTERN (decl) = 1;
7045 DECL_EXTERNAL (decl) = !initialized;
7048 if (DECL_CLASS_SCOPE_P (decl))
7050 set_linkage_for_static_data_member (decl);
7051 /* This function is only called with out-of-class definitions. */
7052 DECL_EXTERNAL (decl) = 0;
7053 check_class_member_definition_namespace (decl);
7055 /* At top level, either `static' or no s.c. makes a definition
7056 (perhaps tentative), and absence of `static' makes it public. */
7057 else if (toplevel_bindings_p ())
7059 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7060 && (DECL_THIS_EXTERN (decl) || ! constp));
7061 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7063 /* Not at top level, only `static' makes a static definition. */
7066 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7067 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7070 if (declspecs->specs[(int)ds_thread])
7071 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7073 /* If the type of the decl has no linkage, make sure that we'll
7074 notice that in mark_used. */
7075 if (cxx_dialect > cxx98
7076 && decl_linkage (decl) != lk_none
7077 && DECL_LANG_SPECIFIC (decl) == NULL
7078 && !DECL_EXTERN_C_P (decl)
7079 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7080 retrofit_lang_decl (decl);
7082 if (TREE_PUBLIC (decl))
7084 /* [basic.link]: A name with no linkage (notably, the name of a class
7085 or enumeration declared in a local scope) shall not be used to
7086 declare an entity with linkage.
7088 DR 757 relaxes this restriction for C++0x. */
7089 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7090 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7093 if (TYPE_ANONYMOUS_P (t))
7095 if (DECL_EXTERN_C_P (decl))
7096 /* Allow this; it's pretty common in C. */
7100 /* DRs 132, 319 and 389 seem to indicate types with
7101 no linkage can only be used to declare extern "C"
7102 entities. Since it's not always an error in the
7103 ISO C++ 90 Standard, we only issue a warning. */
7104 warning (0, "non-local variable %q#D uses anonymous type",
7106 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7107 warning (0, "%q+#D does not refer to the unqualified "
7108 "type, so it is not used for linkage",
7113 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
7117 DECL_INTERFACE_KNOWN (decl) = 1;
7122 /* Create and return a canonical pointer to member function type, for
7123 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7126 build_ptrmemfunc_type (tree type)
7130 tree unqualified_variant = NULL_TREE;
7132 if (type == error_mark_node)
7135 /* If a canonical type already exists for this type, use it. We use
7136 this method instead of type_hash_canon, because it only does a
7137 simple equality check on the list of field members. */
7139 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7142 /* Make sure that we always have the unqualified pointer-to-member
7144 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7146 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7148 t = make_class_type (RECORD_TYPE);
7149 xref_basetypes (t, NULL_TREE);
7151 /* Let the front end know this is a pointer to member function... */
7152 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7153 /* ... and not really a class type. */
7154 SET_CLASS_TYPE_P (t, 0);
7156 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7159 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7161 TREE_CHAIN (field) = fields;
7164 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7166 /* Zap out the name so that the back end will give us the debugging
7167 information for this anonymous RECORD_TYPE. */
7168 TYPE_NAME (t) = NULL_TREE;
7170 /* If this is not the unqualified form of this pointer-to-member
7171 type, set the TYPE_MAIN_VARIANT for this type to be the
7172 unqualified type. Since they are actually RECORD_TYPEs that are
7173 not variants of each other, we must do this manually.
7174 As we just built a new type there is no need to do yet another copy. */
7175 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7177 int type_quals = cp_type_quals (type);
7178 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7179 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7180 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7181 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7182 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7183 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7184 TREE_TYPE (TYPE_BINFO (t)) = t;
7187 /* Cache this pointer-to-member type so that we can find it again
7189 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7191 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7192 SET_TYPE_STRUCTURAL_EQUALITY (t);
7193 else if (TYPE_CANONICAL (type) != type)
7194 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7199 /* Create and return a pointer to data member type. */
7202 build_ptrmem_type (tree class_type, tree member_type)
7204 if (TREE_CODE (member_type) == METHOD_TYPE)
7206 tree arg_types = TYPE_ARG_TYPES (member_type);
7207 cp_cv_quals quals = cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)));
7208 member_type = build_memfn_type (member_type, class_type, quals);
7209 return build_ptrmemfunc_type (build_pointer_type (member_type));
7213 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7214 return build_offset_type (class_type, member_type);
7218 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7219 Check to see that the definition is valid. Issue appropriate error
7220 messages. Return 1 if the definition is particularly bad, or 0
7224 check_static_variable_definition (tree decl, tree type)
7226 /* Motion 10 at San Diego: If a static const integral data member is
7227 initialized with an integral constant expression, the initializer
7228 may appear either in the declaration (within the class), or in
7229 the definition, but not both. If it appears in the class, the
7230 member is a member constant. The file-scope definition is always
7232 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7234 error ("invalid in-class initialization of static data member "
7235 "of non-integral type %qT",
7237 /* If we just return the declaration, crashes will sometimes
7238 occur. We therefore return void_type_node, as if this were a
7239 friend declaration, to cause callers to completely ignore
7240 this declaration. */
7243 else if (!CP_TYPE_CONST_P (type))
7244 error ("ISO C++ forbids in-class initialization of non-const "
7245 "static member %qD",
7247 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7248 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7249 "%qD of non-integral type %qT", decl, type);
7254 /* Given the SIZE (i.e., number of elements) in an array, compute an
7255 appropriate index type for the array. If non-NULL, NAME is the
7256 name of the thing being declared. */
7259 compute_array_index_type (tree name, tree size)
7263 tree abi_1_itype = NULL_TREE;
7265 if (error_operand_p (size))
7266 return error_mark_node;
7268 type = TREE_TYPE (size);
7269 /* The array bound must be an integer type. */
7270 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7273 error ("size of array %qD has non-integral type %qT", name, type);
7275 error ("size of array has non-integral type %qT", type);
7276 size = integer_one_node;
7277 type = TREE_TYPE (size);
7280 /* We can only call value_dependent_expression_p on integral constant
7281 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7282 set if this isn't one. */
7283 if (processing_template_decl
7284 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7286 /* We cannot do any checking for a SIZE that isn't known to be
7287 constant. Just build the index type and mark that it requires
7288 structural equality checks. */
7289 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7290 size, integer_one_node));
7291 TYPE_DEPENDENT_P (itype) = 1;
7292 TYPE_DEPENDENT_P_VALID (itype) = 1;
7293 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7297 if (!abi_version_at_least (2) && processing_template_decl)
7298 /* For abi-1, we handled all instances in templates the same way,
7299 even when they were non-dependent. This affects the manglings
7300 produced. So, we do the normal checking for non-dependent
7301 sizes, but at the end we'll return the same type that abi-1
7302 would have, but with TYPE_CANONICAL set to the "right"
7303 value that the current ABI would provide. */
7304 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7305 size, integer_one_node));
7307 /* The size might be the result of a cast. */
7308 STRIP_TYPE_NOPS (size);
7310 /* It might be a const variable or enumeration constant. */
7311 size = integral_constant_value (size);
7313 /* Normally, the array-bound will be a constant. */
7314 if (TREE_CODE (size) == INTEGER_CST)
7316 /* Check to see if the array bound overflowed. Make that an
7317 error, no matter how generous we're being. */
7318 constant_expression_error (size);
7320 /* An array must have a positive number of elements. */
7321 if (INT_CST_LT (size, integer_zero_node))
7324 error ("size of array %qD is negative", name);
7326 error ("size of array is negative");
7327 size = integer_one_node;
7329 /* As an extension we allow zero-sized arrays. We always allow
7330 them in system headers because glibc uses them. */
7331 else if (integer_zerop (size) && !in_system_header)
7334 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7336 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7339 else if (TREE_CONSTANT (size))
7341 /* `(int) &fn' is not a valid array bound. */
7343 error ("size of array %qD is not an integral constant-expression",
7346 error ("size of array is not an integral constant-expression");
7347 size = integer_one_node;
7349 else if (pedantic && warn_vla != 0)
7352 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7354 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7356 else if (warn_vla > 0)
7360 "variable length array %qD is used", name);
7363 "variable length array is used");
7366 if (processing_template_decl && !TREE_CONSTANT (size))
7367 /* A variable sized array. */
7368 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7371 HOST_WIDE_INT saved_processing_template_decl;
7373 /* Compute the index of the largest element in the array. It is
7374 one less than the number of elements in the array. We save
7375 and restore PROCESSING_TEMPLATE_DECL so that computations in
7376 cp_build_binary_op will be appropriately folded. */
7377 saved_processing_template_decl = processing_template_decl;
7378 processing_template_decl = 0;
7379 itype = cp_build_binary_op (input_location,
7381 cp_convert (ssizetype, size),
7382 cp_convert (ssizetype, integer_one_node),
7383 tf_warning_or_error);
7384 itype = fold (itype);
7385 processing_template_decl = saved_processing_template_decl;
7387 if (!TREE_CONSTANT (itype))
7388 /* A variable sized array. */
7389 itype = variable_size (itype);
7390 /* Make sure that there was no overflow when creating to a signed
7391 index type. (For example, on a 32-bit machine, an array with
7392 size 2^32 - 1 is too big.) */
7393 else if (TREE_CODE (itype) == INTEGER_CST
7394 && TREE_OVERFLOW (itype))
7396 error ("overflow in array dimension");
7397 TREE_OVERFLOW (itype) = 0;
7401 /* Create and return the appropriate index type. */
7404 tree t = build_index_type (itype);
7405 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7409 return build_index_type (itype);
7412 /* Returns the scope (if any) in which the entity declared by
7413 DECLARATOR will be located. If the entity was declared with an
7414 unqualified name, NULL_TREE is returned. */
7417 get_scope_of_declarator (const cp_declarator *declarator)
7419 while (declarator && declarator->kind != cdk_id)
7420 declarator = declarator->declarator;
7422 /* If the declarator-id is a SCOPE_REF, the scope in which the
7423 declaration occurs is the first operand. */
7425 && declarator->u.id.qualifying_scope)
7426 return declarator->u.id.qualifying_scope;
7428 /* Otherwise, the declarator is not a qualified name; the entity will
7429 be declared in the current scope. */
7433 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7434 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7438 create_array_type_for_decl (tree name, tree type, tree size)
7440 tree itype = NULL_TREE;
7442 /* If things have already gone awry, bail now. */
7443 if (type == error_mark_node || size == error_mark_node)
7444 return error_mark_node;
7446 /* If there are some types which cannot be array elements,
7447 issue an error-message and return. */
7448 switch (TREE_CODE (type))
7452 error ("declaration of %qD as array of void", name);
7454 error ("creating array of void");
7455 return error_mark_node;
7459 error ("declaration of %qD as array of functions", name);
7461 error ("creating array of functions");
7462 return error_mark_node;
7464 case REFERENCE_TYPE:
7466 error ("declaration of %qD as array of references", name);
7468 error ("creating array of references");
7469 return error_mark_node;
7473 error ("declaration of %qD as array of function members", name);
7475 error ("creating array of function members");
7476 return error_mark_node;
7484 The constant expressions that specify the bounds of the arrays
7485 can be omitted only for the first member of the sequence. */
7486 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7489 error ("declaration of %qD as multidimensional array must "
7490 "have bounds for all dimensions except the first",
7493 error ("multidimensional array must have bounds for all "
7494 "dimensions except the first");
7496 return error_mark_node;
7499 /* Figure out the index type for the array. */
7501 itype = compute_array_index_type (name, size);
7504 T is called the array element type; this type shall not be [...] an
7505 abstract class type. */
7506 abstract_virtuals_error (name, type);
7508 return build_cplus_array_type (type, itype);
7511 /* Check that it's OK to declare a function with the indicated TYPE.
7512 SFK indicates the kind of special function (if any) that this
7513 function is. OPTYPE is the type given in a conversion operator
7514 declaration, or the class type for a constructor/destructor.
7515 Returns the actual return type of the function; that
7516 may be different than TYPE if an error occurs, or for certain
7517 special functions. */
7520 check_special_function_return_type (special_function_kind sfk,
7526 case sfk_constructor:
7528 error ("return type specification for constructor invalid");
7530 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7531 type = build_pointer_type (optype);
7533 type = void_type_node;
7536 case sfk_destructor:
7538 error ("return type specification for destructor invalid");
7539 /* We can't use the proper return type here because we run into
7540 problems with ambiguous bases and covariant returns.
7541 Java classes are left unchanged because (void *) isn't a valid
7542 Java type, and we don't want to change the Java ABI. */
7543 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7544 type = build_pointer_type (void_type_node);
7546 type = void_type_node;
7549 case sfk_conversion:
7551 error ("return type specified for %<operator %T%>", optype);
7562 /* A variable or data member (whose unqualified name is IDENTIFIER)
7563 has been declared with the indicated TYPE. If the TYPE is not
7564 acceptable, issue an error message and return a type to use for
7565 error-recovery purposes. */
7568 check_var_type (tree identifier, tree type)
7570 if (VOID_TYPE_P (type))
7573 error ("unnamed variable or field declared void");
7574 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7576 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7577 error ("variable or field %qE declared void", identifier);
7580 error ("variable or field declared void");
7581 type = error_mark_node;
7587 /* Given declspecs and a declarator (abstract or otherwise), determine
7588 the name and type of the object declared and construct a DECL node
7591 DECLSPECS points to the representation of declaration-specifier
7592 sequence that precedes declarator.
7594 DECL_CONTEXT says which syntactic context this declaration is in:
7595 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7596 FUNCDEF for a function definition. Like NORMAL but a few different
7597 error messages in each case. Return value may be zero meaning
7598 this definition is too screwy to try to parse.
7599 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7600 handle member functions (which have FIELD context).
7601 Return value may be zero meaning this definition is too screwy to
7603 PARM for a parameter declaration (either within a function prototype
7604 or before a function body). Make a PARM_DECL, or return void_type_node.
7605 TPARM for a template parameter declaration.
7606 CATCHPARM for a parameter declaration before a catch clause.
7607 TYPENAME if for a typename (in a cast or sizeof).
7608 Don't make a DECL node; just return the ..._TYPE node.
7609 FIELD for a struct or union field; make a FIELD_DECL.
7610 BITFIELD for a field with specified width.
7612 INITIALIZED is as for start_decl.
7614 ATTRLIST is a pointer to the list of attributes, which may be NULL
7615 if there are none; *ATTRLIST may be modified if attributes from inside
7616 the declarator should be applied to the declaration.
7618 When this function is called, scoping variables (such as
7619 CURRENT_CLASS_TYPE) should reflect the scope in which the
7620 declaration occurs, not the scope in which the new declaration will
7621 be placed. For example, on:
7625 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7628 Returns a DECL (if a declarator is present), a TYPE (if there is no
7629 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7633 grokdeclarator (const cp_declarator *declarator,
7634 const cp_decl_specifier_seq *declspecs,
7635 enum decl_context decl_context,
7639 tree type = NULL_TREE;
7641 int virtualp, explicitp, friendp, inlinep, staticp;
7642 int explicit_int = 0;
7643 int explicit_char = 0;
7644 int defaulted_int = 0;
7645 tree dependent_name = NULL_TREE;
7647 tree typedef_decl = NULL_TREE;
7648 const char *name = NULL;
7649 tree typedef_type = NULL_TREE;
7650 /* True if this declarator is a function definition. */
7651 bool funcdef_flag = false;
7652 cp_declarator_kind innermost_code = cdk_error;
7655 /* See the code below that used this. */
7656 tree decl_attr = NULL_TREE;
7659 /* Keep track of what sort of function is being processed
7660 so that we can warn about default return values, or explicit
7661 return values which do not match prescribed defaults. */
7662 special_function_kind sfk = sfk_none;
7664 tree dname = NULL_TREE;
7665 tree ctor_return_type = NULL_TREE;
7666 enum overload_flags flags = NO_SPECIAL;
7667 /* cv-qualifiers that apply to the declarator, for a declaration of
7668 a member function. */
7669 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7670 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7672 tree raises = NULL_TREE;
7673 int template_count = 0;
7674 tree returned_attrs = NULL_TREE;
7675 tree parms = NULL_TREE;
7676 const cp_declarator *id_declarator;
7677 /* The unqualified name of the declarator; either an
7678 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7679 tree unqualified_id;
7680 /* The class type, if any, in which this entity is located,
7681 or NULL_TREE if none. Note that this value may be different from
7682 the current class type; for example if an attempt is made to declare
7683 "A::f" inside "B", this value will be "A". */
7684 tree ctype = current_class_type;
7685 /* The NAMESPACE_DECL for the namespace in which this entity is
7686 located. If an unqualified name is used to declare the entity,
7687 this value will be NULL_TREE, even if the entity is located at
7689 tree in_namespace = NULL_TREE;
7690 cp_storage_class storage_class;
7691 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7692 bool type_was_error_mark_node = false;
7693 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7694 bool template_type_arg = false;
7695 bool template_parm_flag = false;
7696 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7699 signed_p = declspecs->specs[(int)ds_signed];
7700 unsigned_p = declspecs->specs[(int)ds_unsigned];
7701 short_p = declspecs->specs[(int)ds_short];
7702 long_p = declspecs->specs[(int)ds_long];
7703 longlong = declspecs->specs[(int)ds_long] >= 2;
7704 thread_p = declspecs->specs[(int)ds_thread];
7706 if (decl_context == FUNCDEF)
7707 funcdef_flag = true, decl_context = NORMAL;
7708 else if (decl_context == MEMFUNCDEF)
7709 funcdef_flag = true, decl_context = FIELD;
7710 else if (decl_context == BITFIELD)
7711 bitfield = 1, decl_context = FIELD;
7712 else if (decl_context == TEMPLATE_TYPE_ARG)
7713 template_type_arg = true, decl_context = TYPENAME;
7714 else if (decl_context == TPARM)
7715 template_parm_flag = true, decl_context = PARM;
7717 if (initialized > 1)
7718 funcdef_flag = true;
7720 /* Look inside a declarator for the name being declared
7721 and get it as a string, for an error message. */
7722 for (id_declarator = declarator;
7724 id_declarator = id_declarator->declarator)
7726 if (id_declarator->kind != cdk_id)
7727 innermost_code = id_declarator->kind;
7729 switch (id_declarator->kind)
7732 if (id_declarator->declarator
7733 && id_declarator->declarator->kind == cdk_id)
7735 sfk = id_declarator->declarator->u.id.sfk;
7736 if (sfk == sfk_destructor)
7743 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7744 tree decl = id_declarator->u.id.unqualified_name;
7747 if (qualifying_scope)
7749 if (at_function_scope_p ())
7753 A declarator-id shall not be qualified except
7756 None of the cases are permitted in block
7758 if (qualifying_scope == global_namespace)
7759 error ("invalid use of qualified-name %<::%D%>",
7761 else if (TYPE_P (qualifying_scope))
7762 error ("invalid use of qualified-name %<%T::%D%>",
7763 qualifying_scope, decl);
7765 error ("invalid use of qualified-name %<%D::%D%>",
7766 qualifying_scope, decl);
7767 return error_mark_node;
7769 else if (TYPE_P (qualifying_scope))
7771 ctype = qualifying_scope;
7772 if (innermost_code != cdk_function
7773 && current_class_type
7774 && !UNIQUELY_DERIVED_FROM_P (ctype,
7775 current_class_type))
7777 error ("type %qT is not derived from type %qT",
7778 ctype, current_class_type);
7779 return error_mark_node;
7782 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7783 in_namespace = qualifying_scope;
7785 switch (TREE_CODE (decl))
7791 if (innermost_code != cdk_function)
7793 error ("declaration of %qD as non-function", decl);
7794 return error_mark_node;
7796 else if (!qualifying_scope
7797 && !(current_class_type && at_class_scope_p ()))
7799 error ("declaration of %qD as non-member", decl);
7800 return error_mark_node;
7803 type = TREE_OPERAND (decl, 0);
7805 type = constructor_name (type);
7806 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7811 case TEMPLATE_ID_EXPR:
7813 tree fns = TREE_OPERAND (decl, 0);
7816 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7818 gcc_assert (is_overloaded_fn (dname));
7819 dname = DECL_NAME (get_first_fn (dname));
7824 case IDENTIFIER_NODE:
7825 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7828 if (C_IS_RESERVED_WORD (dname))
7830 error ("declarator-id missing; using reserved word %qD",
7832 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7834 else if (!IDENTIFIER_TYPENAME_P (dname))
7835 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7838 gcc_assert (flags == NO_SPECIAL);
7839 flags = TYPENAME_FLAG;
7840 ctor_return_type = TREE_TYPE (dname);
7841 sfk = sfk_conversion;
7842 if (is_typename_at_global_scope (dname))
7843 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7845 name = "<invalid operator>";
7862 return error_mark_node;
7867 if (id_declarator->kind == cdk_id)
7873 The declarator in a function-definition shall have the form
7874 D1 ( parameter-declaration-clause) ... */
7875 if (funcdef_flag && innermost_code != cdk_function)
7877 error ("function definition does not declare parameters");
7878 return error_mark_node;
7881 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7882 && innermost_code != cdk_function
7883 && ! (ctype && !declspecs->any_specifiers_p))
7885 error ("declaration of %qD as non-function", dname);
7886 return error_mark_node;
7889 /* Anything declared one level down from the top level
7890 must be one of the parameters of a function
7891 (because the body is at least two levels down). */
7893 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7894 by not allowing C++ class definitions to specify their parameters
7895 with xdecls (must be spec.d in the parmlist).
7897 Since we now wait to push a class scope until we are sure that
7898 we are in a legitimate method context, we must set oldcname
7899 explicitly (since current_class_name is not yet alive).
7901 We also want to avoid calling this a PARM if it is in a namespace. */
7903 if (decl_context == NORMAL && !toplevel_bindings_p ())
7905 struct cp_binding_level *b = current_binding_level;
7906 current_binding_level = b->level_chain;
7907 if (current_binding_level != 0 && toplevel_bindings_p ())
7908 decl_context = PARM;
7909 current_binding_level = b;
7913 name = decl_context == PARM ? "parameter" : "type name";
7915 /* If there were multiple types specified in the decl-specifier-seq,
7916 issue an error message. */
7917 if (declspecs->multiple_types_p)
7919 error ("two or more data types in declaration of %qs", name);
7920 return error_mark_node;
7923 if (declspecs->conflicting_specifiers_p)
7925 error ("conflicting specifiers in declaration of %qs", name);
7926 return error_mark_node;
7929 /* Extract the basic type from the decl-specifier-seq. */
7930 type = declspecs->type;
7931 if (type == error_mark_node)
7934 type_was_error_mark_node = true;
7936 /* If the entire declaration is itself tagged as deprecated then
7937 suppress reports of deprecated items. */
7938 if (type && TREE_DEPRECATED (type)
7939 && deprecated_state != DEPRECATED_SUPPRESS)
7940 warn_deprecated_use (type, NULL_TREE);
7941 if (type && TREE_CODE (type) == TYPE_DECL)
7943 typedef_decl = type;
7944 type = TREE_TYPE (typedef_decl);
7945 if (TREE_DEPRECATED (type)
7946 && DECL_ARTIFICIAL (typedef_decl)
7947 && deprecated_state != DEPRECATED_SUPPRESS)
7948 warn_deprecated_use (type, NULL_TREE);
7950 /* No type at all: default to `int', and set DEFAULTED_INT
7951 because it was not a user-defined typedef. */
7952 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7954 /* These imply 'int'. */
7955 type = integer_type_node;
7959 explicit_int = declspecs->explicit_int_p;
7960 explicit_char = declspecs->explicit_char_p;
7963 /* See the code below that used this. */
7965 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7967 typedef_type = type;
7970 if (sfk != sfk_conversion)
7971 ctor_return_type = ctype;
7973 if (sfk != sfk_none)
7974 type = check_special_function_return_type (sfk, type,
7976 else if (type == NULL_TREE)
7982 /* We handle `main' specially here, because 'main () { }' is so
7983 common. With no options, it is allowed. With -Wreturn-type,
7984 it is a warning. It is only an error with -pedantic-errors. */
7985 is_main = (funcdef_flag
7986 && dname && MAIN_NAME_P (dname)
7987 && ctype == NULL_TREE
7988 && in_namespace == NULL_TREE
7989 && current_namespace == global_namespace);
7991 if (type_was_error_mark_node)
7992 /* We've already issued an error, don't complain more. */;
7993 else if (in_system_header || flag_ms_extensions)
7994 /* Allow it, sigh. */;
7996 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7998 pedwarn (input_location, OPT_pedantic,
7999 "ISO C++ forbids declaration of %qs with no type", name);
8001 warning (OPT_Wreturn_type,
8002 "ISO C++ forbids declaration of %qs with no type", name);
8004 type = integer_type_node;
8009 /* Now process the modifiers that were specified
8010 and check for invalid combinations. */
8012 /* Long double is a special combination. */
8013 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8016 type = build_qualified_type (long_double_type_node,
8017 cp_type_quals (type));
8020 /* Check all other uses of type modifiers. */
8022 if (unsigned_p || signed_p || long_p || short_p)
8026 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8027 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8028 else if (signed_p && unsigned_p)
8029 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8030 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8031 error ("%<long long%> invalid for %qs", name);
8032 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8033 error ("%<long%> invalid for %qs", name);
8034 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8035 error ("%<short%> invalid for %qs", name);
8036 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8037 error ("%<long%> or %<short%> invalid for %qs", name);
8038 else if ((long_p || short_p) && explicit_char)
8039 error ("%<long%> or %<short%> specified with char for %qs", name);
8040 else if (long_p && short_p)
8041 error ("%<long%> and %<short%> specified together for %qs", name);
8042 else if (type == char16_type_node || type == char32_type_node)
8044 if (signed_p || unsigned_p)
8045 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8046 else if (short_p || long_p)
8047 error ("%<short%> or %<long%> invalid for %qs", name);
8052 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
8054 pedwarn (input_location, OPT_pedantic,
8055 "long, short, signed or unsigned used invalidly for %qs",
8057 if (flag_pedantic_errors)
8062 /* Discard the type modifiers if they are invalid. */
8073 /* Decide whether an integer type is signed or not.
8074 Optionally treat bitfields as signed by default. */
8078 It is implementation-defined whether a plain (neither
8079 explicitly signed or unsigned) char, short, int, or long
8080 bit-field is signed or unsigned.
8082 Naturally, we extend this to long long as well. Note that
8083 this does not include wchar_t. */
8084 || (bitfield && !flag_signed_bitfields
8086 /* A typedef for plain `int' without `signed' can be
8087 controlled just like plain `int', but a typedef for
8088 `signed int' cannot be so controlled. */
8090 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8091 && TREE_CODE (type) == INTEGER_TYPE
8092 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8095 type = long_long_unsigned_type_node;
8097 type = long_unsigned_type_node;
8099 type = short_unsigned_type_node;
8100 else if (type == char_type_node)
8101 type = unsigned_char_type_node;
8102 else if (typedef_decl)
8103 type = unsigned_type_for (type);
8105 type = unsigned_type_node;
8107 else if (signed_p && type == char_type_node)
8108 type = signed_char_type_node;
8110 type = long_long_integer_type_node;
8112 type = long_integer_type_node;
8114 type = short_integer_type_node;
8116 if (declspecs->specs[(int)ds_complex])
8118 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8119 error ("complex invalid for %qs", name);
8120 /* If we just have "complex", it is equivalent to
8121 "complex double", but if any modifiers at all are specified it is
8122 the complex form of TYPE. E.g, "complex short" is
8123 "complex short int". */
8125 else if (defaulted_int && ! longlong
8126 && ! (long_p || short_p || signed_p || unsigned_p))
8127 type = complex_double_type_node;
8128 else if (type == integer_type_node)
8129 type = complex_integer_type_node;
8130 else if (type == float_type_node)
8131 type = complex_float_type_node;
8132 else if (type == double_type_node)
8133 type = complex_double_type_node;
8134 else if (type == long_double_type_node)
8135 type = complex_long_double_type_node;
8137 type = build_complex_type (type);
8140 type_quals = TYPE_UNQUALIFIED;
8141 if (declspecs->specs[(int)ds_const])
8142 type_quals |= TYPE_QUAL_CONST;
8143 /* A `constexpr' specifier used in an object declaration declares
8144 the object as `const'. */
8147 if (innermost_code == cdk_function)
8149 else if (declspecs->specs[(int)ds_const] != 0)
8150 error ("both %<const%> and %<constexpr%> cannot be used here");
8152 type_quals |= TYPE_QUAL_CONST;
8154 if (declspecs->specs[(int)ds_volatile])
8155 type_quals |= TYPE_QUAL_VOLATILE;
8156 if (declspecs->specs[(int)ds_restrict])
8157 type_quals |= TYPE_QUAL_RESTRICT;
8158 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8159 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8162 if (TREE_CODE (type) == FUNCTION_TYPE
8163 && type_quals != TYPE_UNQUALIFIED)
8165 /* This was an error in C++98 (cv-qualifiers cannot be added to
8166 a function type), but DR 295 makes the code well-formed by
8167 dropping the extra qualifiers. */
8168 if (pedantic && cxx_dialect == cxx98)
8170 tree bad_type = build_qualified_type (type, type_quals);
8171 pedwarn (input_location, OPT_pedantic,
8172 "ignoring %qV qualifiers added to function type %qT",
8175 type_quals = TYPE_UNQUALIFIED;
8177 type_quals |= cp_type_quals (type);
8178 type = cp_build_qualified_type_real
8179 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8180 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8181 /* We might have ignored or rejected some of the qualifiers. */
8182 type_quals = cp_type_quals (type);
8185 inlinep = !! declspecs->specs[(int)ds_inline];
8186 virtualp = !! declspecs->specs[(int)ds_virtual];
8187 explicitp = !! declspecs->specs[(int)ds_explicit];
8189 storage_class = declspecs->storage_class;
8190 if (storage_class == sc_static)
8191 staticp = 1 + (decl_context == FIELD);
8193 if (virtualp && staticp == 2)
8195 error ("member %qD cannot be declared both virtual and static", dname);
8196 storage_class = sc_none;
8199 friendp = !! declspecs->specs[(int)ds_friend];
8201 if (dependent_name && !friendp)
8203 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8204 return error_mark_node;
8207 /* Issue errors about use of storage classes for parameters. */
8208 if (decl_context == PARM)
8210 if (declspecs->specs[(int)ds_typedef])
8212 error ("typedef declaration invalid in parameter declaration");
8213 return error_mark_node;
8215 else if (template_parm_flag && storage_class != sc_none)
8217 error ("storage class specified for template parameter %qs", name);
8218 return error_mark_node;
8220 else if (storage_class == sc_static
8221 || storage_class == sc_extern
8223 error ("storage class specifiers invalid in parameter declarations");
8225 if (type_uses_auto (type))
8227 error ("parameter declared %<auto%>");
8228 type = error_mark_node;
8231 /* Function parameters cannot be constexpr. If we saw one, moan
8232 and pretend it wasn't there. */
8235 error ("a parameter cannot be declared %<constexpr%>");
8240 /* Give error if `virtual' is used outside of class declaration. */
8242 && (current_class_name == NULL_TREE || decl_context != FIELD))
8244 error ("%<virtual%> outside class declaration");
8248 /* Static anonymous unions are dealt with here. */
8249 if (staticp && decl_context == TYPENAME
8251 && ANON_AGGR_TYPE_P (declspecs->type))
8252 decl_context = FIELD;
8254 /* Warn about storage classes that are invalid for certain
8255 kinds of declarations (parameters, typenames, etc.). */
8258 && storage_class != sc_extern
8259 && storage_class != sc_static)
8260 || declspecs->specs[(int)ds_typedef]))
8262 error ("multiple storage classes in declaration of %qs", name);
8265 if (decl_context != NORMAL
8266 && ((storage_class != sc_none
8267 && storage_class != sc_mutable)
8270 if ((decl_context == PARM || decl_context == CATCHPARM)
8271 && (storage_class == sc_register
8272 || storage_class == sc_auto))
8274 else if (declspecs->specs[(int)ds_typedef])
8276 else if (decl_context == FIELD
8277 /* C++ allows static class elements. */
8278 && storage_class == sc_static)
8279 /* C++ also allows inlines and signed and unsigned elements,
8280 but in those cases we don't come in here. */
8284 if (decl_context == FIELD)
8285 error ("storage class specified for %qs", name);
8288 if (decl_context == PARM || decl_context == CATCHPARM)
8289 error ("storage class specified for parameter %qs", name);
8291 error ("storage class specified for typename");
8293 if (storage_class == sc_register
8294 || storage_class == sc_auto
8295 || storage_class == sc_extern
8297 storage_class = sc_none;
8300 else if (storage_class == sc_extern && funcdef_flag
8301 && ! toplevel_bindings_p ())
8302 error ("nested function %qs declared %<extern%>", name);
8303 else if (toplevel_bindings_p ())
8305 if (storage_class == sc_auto)
8306 error ("top-level declaration of %qs specifies %<auto%>", name);
8309 && storage_class != sc_extern
8310 && storage_class != sc_static)
8312 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8317 if (storage_class && friendp)
8319 error ("storage class specifiers invalid in friend function declarations");
8320 storage_class = sc_none;
8325 unqualified_id = NULL_TREE;
8328 unqualified_id = id_declarator->u.id.unqualified_name;
8329 switch (TREE_CODE (unqualified_id))
8332 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8333 if (TYPE_P (unqualified_id))
8334 unqualified_id = constructor_name (unqualified_id);
8337 case IDENTIFIER_NODE:
8338 case TEMPLATE_ID_EXPR:
8346 /* Determine the type of the entity declared by recurring on the
8348 for (; declarator; declarator = declarator->declarator)
8350 const cp_declarator *inner_declarator;
8353 if (type == error_mark_node)
8354 return error_mark_node;
8356 attrs = declarator->attributes;
8362 if (declarator == NULL || declarator->kind == cdk_id)
8363 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8364 if (declarator->kind == cdk_function)
8365 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8366 if (declarator->kind == cdk_array)
8367 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8368 returned_attrs = decl_attributes (&type,
8369 chainon (returned_attrs, attrs),
8373 if (declarator->kind == cdk_id)
8376 inner_declarator = declarator->declarator;
8378 switch (declarator->kind)
8381 type = create_array_type_for_decl (dname, type,
8382 declarator->u.array.bounds);
8390 /* Declaring a function type.
8391 Make sure we have a valid type for the function to return. */
8393 if (type_quals != TYPE_UNQUALIFIED)
8395 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8396 warning (OPT_Wignored_qualifiers,
8397 "type qualifiers ignored on function return type");
8398 /* We now know that the TYPE_QUALS don't apply to the
8399 decl, but to its return type. */
8400 type_quals = TYPE_UNQUALIFIED;
8402 errmsg = targetm.invalid_return_type (type);
8406 type = integer_type_node;
8409 /* Error about some types functions can't return. */
8411 if (TREE_CODE (type) == FUNCTION_TYPE)
8413 error ("%qs declared as function returning a function", name);
8414 return error_mark_node;
8416 if (TREE_CODE (type) == ARRAY_TYPE)
8418 error ("%qs declared as function returning an array", name);
8419 return error_mark_node;
8422 /* Pick up type qualifiers which should be applied to `this'. */
8423 memfn_quals = declarator->u.function.qualifiers;
8425 /* Pick up the exception specifications. */
8426 raises = declarator->u.function.exception_specification;
8428 /* Say it's a definition only for the CALL_EXPR
8429 closest to the identifier. */
8430 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8432 /* Handle a late-specified return type. */
8435 if (type_uses_auto (type))
8437 if (!declarator->u.function.late_return_type)
8439 error ("%qs function uses %<auto%> type specifier without"
8440 " late return type", name);
8441 return error_mark_node;
8443 else if (!is_auto (type))
8445 error ("%qs function with late return type has"
8446 " %qT as its type rather than plain %<auto%>",
8448 return error_mark_node;
8451 else if (declarator->u.function.late_return_type)
8453 error ("%qs function with late return type not declared"
8454 " with %<auto%> type specifier", name);
8455 return error_mark_node;
8458 type = splice_late_return_type
8459 (type, declarator->u.function.late_return_type);
8460 if (type == error_mark_node)
8461 return error_mark_node;
8463 if (ctype == NULL_TREE
8464 && decl_context == FIELD
8466 && (friendp == 0 || dname == current_class_name))
8467 ctype = current_class_type;
8469 if (ctype && (sfk == sfk_constructor
8470 || sfk == sfk_destructor))
8472 /* We are within a class's scope. If our declarator name
8473 is the same as the class name, and we are defining
8474 a function, then it is a constructor/destructor, and
8475 therefore returns a void type. */
8477 /* ISO C++ 12.4/2. A destructor may not be declared
8478 const or volatile. A destructor may not be
8481 ISO C++ 12.1. A constructor may not be declared
8482 const or volatile. A constructor may not be
8483 virtual. A constructor may not be static. */
8485 error ((flags == DTOR_FLAG)
8486 ? "destructor cannot be static member function"
8487 : "constructor cannot be static member function");
8490 error ((flags == DTOR_FLAG)
8491 ? "destructors may not be cv-qualified"
8492 : "constructors may not be cv-qualified");
8493 memfn_quals = TYPE_UNQUALIFIED;
8496 if (decl_context == FIELD
8497 && !member_function_or_else (ctype,
8500 return error_mark_node;
8502 if (flags != DTOR_FLAG)
8504 /* It's a constructor. */
8509 permerror (input_location, "constructors cannot be declared virtual");
8512 if (decl_context == FIELD
8513 && sfk != sfk_constructor)
8514 return error_mark_node;
8516 if (decl_context == FIELD)
8522 error ("can't initialize friend function %qs", name);
8525 /* Cannot be both friend and virtual. */
8526 error ("virtual functions cannot be friends");
8529 if (decl_context == NORMAL)
8530 error ("friend declaration not in class definition");
8531 if (current_function_decl && funcdef_flag)
8532 error ("can't define friend function %qs in a local "
8536 else if (ctype && sfk == sfk_conversion)
8540 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8545 /* It is not allowed to use `constexpr' in a function
8546 declaration that is not a definition.
8547 That is too strict, though. */
8548 if (constexpr_p && !funcdef_flag)
8550 error ("the %<constexpr%> specifier cannot be used in "
8551 "a function declaration that is not a definition");
8552 constexpr_p = false;
8555 /* A constexpr non-static member function is implicitly const. */
8556 if (constexpr_p && decl_context == FIELD && staticp == 0
8557 && sfk != sfk_constructor && sfk != sfk_destructor)
8558 memfn_quals |= TYPE_QUAL_CONST;
8560 arg_types = grokparms (declarator->u.function.parameters,
8563 if (inner_declarator
8564 && inner_declarator->kind == cdk_id
8565 && inner_declarator->u.id.sfk == sfk_destructor
8566 && arg_types != void_list_node)
8568 error ("destructors may not have parameters");
8569 arg_types = void_list_node;
8573 type = build_function_type (type, arg_types);
8580 /* Filter out pointers-to-references and references-to-references.
8581 We can get these if a TYPE_DECL is used. */
8583 if (TREE_CODE (type) == REFERENCE_TYPE)
8585 if (declarator->kind != cdk_reference)
8587 error ("cannot declare pointer to %q#T", type);
8588 type = TREE_TYPE (type);
8591 /* In C++0x, we allow reference to reference declarations
8592 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8593 and template type arguments [14.3.1/4 temp.arg.type]. The
8594 check for direct reference to reference declarations, which
8595 are still forbidden, occurs below. Reasoning behind the change
8596 can be found in DR106, DR540, and the rvalue reference
8598 else if (cxx_dialect == cxx98)
8600 error ("cannot declare reference to %q#T", type);
8601 type = TREE_TYPE (type);
8604 else if (VOID_TYPE_P (type))
8606 if (declarator->kind == cdk_reference)
8607 error ("cannot declare reference to %q#T", type);
8608 else if (declarator->kind == cdk_ptrmem)
8609 error ("cannot declare pointer to %q#T member", type);
8612 /* We now know that the TYPE_QUALS don't apply to the decl,
8613 but to the target of the pointer. */
8614 type_quals = TYPE_UNQUALIFIED;
8616 if (declarator->kind == cdk_ptrmem
8617 && (TREE_CODE (type) == FUNCTION_TYPE
8618 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8620 memfn_quals |= cp_type_quals (type);
8621 type = build_memfn_type (type,
8622 declarator->u.pointer.class_type,
8624 memfn_quals = TYPE_UNQUALIFIED;
8627 if (TREE_CODE (type) == FUNCTION_TYPE
8628 && cp_type_quals (type) != TYPE_UNQUALIFIED)
8629 error (declarator->kind == cdk_reference
8630 ? G_("cannot declare reference to qualified function type %qT")
8631 : G_("cannot declare pointer to qualified function type %qT"),
8634 if (declarator->kind == cdk_reference)
8636 /* In C++0x, the type we are creating a reference to might be
8637 a typedef which is itself a reference type. In that case,
8638 we follow the reference collapsing rules in
8639 [7.1.3/8 dcl.typedef] to create the final reference type:
8641 "If a typedef TD names a type that is a reference to a type
8642 T, an attempt to create the type 'lvalue reference to cv TD'
8643 creates the type 'lvalue reference to T,' while an attempt
8644 to create the type "rvalue reference to cv TD' creates the
8647 if (!VOID_TYPE_P (type))
8648 type = cp_build_reference_type
8649 ((TREE_CODE (type) == REFERENCE_TYPE
8650 ? TREE_TYPE (type) : type),
8651 (declarator->u.reference.rvalue_ref
8652 && (TREE_CODE(type) != REFERENCE_TYPE
8653 || TYPE_REF_IS_RVALUE (type))));
8655 /* In C++0x, we need this check for direct reference to
8656 reference declarations, which are forbidden by
8657 [8.3.2/5 dcl.ref]. Reference to reference declarations
8658 are only allowed indirectly through typedefs and template
8659 type arguments. Example:
8661 void foo(int & &); // invalid ref-to-ref decl
8663 typedef int & int_ref;
8664 void foo(int_ref &); // valid ref-to-ref decl
8666 if (inner_declarator && inner_declarator->kind == cdk_reference)
8667 error ("cannot declare reference to %q#T, which is not "
8668 "a typedef or a template type argument", type);
8670 else if (TREE_CODE (type) == METHOD_TYPE)
8671 type = build_ptrmemfunc_type (build_pointer_type (type));
8672 else if (declarator->kind == cdk_ptrmem)
8674 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8676 if (declarator->u.pointer.class_type == error_mark_node)
8677 /* We will already have complained. */
8678 type = error_mark_node;
8680 type = build_ptrmem_type (declarator->u.pointer.class_type,
8684 type = build_pointer_type (type);
8686 /* Process a list of type modifier keywords (such as
8687 const or volatile) that were given inside the `*' or `&'. */
8689 if (declarator->u.pointer.qualifiers)
8692 = cp_build_qualified_type (type,
8693 declarator->u.pointer.qualifiers);
8694 type_quals = cp_type_quals (type);
8707 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8708 && TREE_CODE (type) != FUNCTION_TYPE
8709 && TREE_CODE (type) != METHOD_TYPE)
8711 error ("template-id %qD used as a declarator",
8713 unqualified_id = dname;
8716 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8717 qualified with a class-name, turn it into a METHOD_TYPE, unless
8718 we know that the function is static. We take advantage of this
8719 opportunity to do other processing that pertains to entities
8720 explicitly declared to be class members. Note that if DECLARATOR
8721 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8722 would not have exited the loop above. */
8724 && declarator->u.id.qualifying_scope
8725 && TYPE_P (declarator->u.id.qualifying_scope))
8729 ctype = declarator->u.id.qualifying_scope;
8730 ctype = TYPE_MAIN_VARIANT (ctype);
8732 while (t != NULL_TREE && CLASS_TYPE_P (t))
8734 /* You're supposed to have one `template <...>' for every
8735 template class, but you don't need one for a full
8736 specialization. For example:
8738 template <class T> struct S{};
8739 template <> struct S<int> { void f(); };
8740 void S<int>::f () {}
8742 is correct; there shouldn't be a `template <>' for the
8743 definition of `S<int>::f'. */
8744 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8745 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8746 /* T is an explicit (not partial) specialization. All
8747 containing classes must therefore also be explicitly
8750 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8751 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8752 template_count += 1;
8754 t = TYPE_MAIN_DECL (t);
8755 t = DECL_CONTEXT (t);
8758 if (ctype == current_class_type)
8762 permerror (input_location, "member functions are implicitly friends of their class");
8766 permerror (declarator->id_loc,
8767 "extra qualification %<%T::%> on member %qs",
8770 else if (/* If the qualifying type is already complete, then we
8771 can skip the following checks. */
8772 !COMPLETE_TYPE_P (ctype)
8773 && (/* If the function is being defined, then
8774 qualifying type must certainly be complete. */
8776 /* A friend declaration of "T::f" is OK, even if
8777 "T" is a template parameter. But, if this
8778 function is not a friend, the qualifying type
8780 || (!friendp && !CLASS_TYPE_P (ctype))
8781 /* For a declaration, the type need not be
8782 complete, if either it is dependent (since there
8783 is no meaningful definition of complete in that
8784 case) or the qualifying class is currently being
8786 || !(dependent_type_p (ctype)
8787 || currently_open_class (ctype)))
8788 /* Check that the qualifying type is complete. */
8789 && !complete_type_or_else (ctype, NULL_TREE))
8790 return error_mark_node;
8791 else if (TREE_CODE (type) == FUNCTION_TYPE)
8793 tree sname = declarator->u.id.unqualified_name;
8795 if (current_class_type
8796 && (!friendp || funcdef_flag))
8799 ? "cannot define member function %<%T::%s%> within %<%T%>"
8800 : "cannot declare member function %<%T::%s%> within %<%T%>",
8801 ctype, name, current_class_type);
8802 return error_mark_node;
8805 /* It is not permitted to define a member function outside ist
8806 membership class as `constexpr'. */
8808 error ("a constexpr function cannot be defined "
8809 "outside of its class");
8811 if (TREE_CODE (sname) == IDENTIFIER_NODE
8812 && NEW_DELETE_OPNAME_P (sname))
8813 /* Overloaded operator new and operator delete
8814 are always static functions. */
8817 type = build_memfn_type (type, ctype, memfn_quals);
8819 else if (declspecs->specs[(int)ds_typedef]
8820 && current_class_type)
8822 error ("cannot declare member %<%T::%s%> within %qT",
8823 ctype, name, current_class_type);
8824 return error_mark_node;
8828 /* Now TYPE has the actual type. */
8833 *attrlist = chainon (returned_attrs, *attrlist);
8835 attrlist = &returned_attrs;
8838 /* Handle parameter packs. */
8839 if (parameter_pack_p)
8841 if (decl_context == PARM)
8842 /* Turn the type into a pack expansion.*/
8843 type = make_pack_expansion (type);
8845 error ("non-parameter %qs cannot be a parameter pack", name);
8848 /* Did array size calculations overflow? */
8850 if (TREE_CODE (type) == ARRAY_TYPE
8851 && COMPLETE_TYPE_P (type)
8852 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8853 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8855 error ("size of array %qs is too large", name);
8856 /* If we proceed with the array type as it is, we'll eventually
8857 crash in tree_low_cst(). */
8858 type = error_mark_node;
8861 if ((decl_context == FIELD || decl_context == PARM)
8862 && !processing_template_decl
8863 && variably_modified_type_p (type, NULL_TREE))
8865 if (decl_context == FIELD)
8866 error ("data member may not have variably modified type %qT", type);
8868 error ("parameter may not have variably modified type %qT", type);
8869 type = error_mark_node;
8872 if (explicitp == 1 || (explicitp && friendp))
8874 /* [dcl.fct.spec] The explicit specifier shall only be used in
8875 declarations of constructors within a class definition. */
8876 error ("only declarations of constructors can be %<explicit%>");
8880 if (storage_class == sc_mutable)
8882 if (decl_context != FIELD || friendp)
8884 error ("non-member %qs cannot be declared %<mutable%>", name);
8885 storage_class = sc_none;
8887 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8889 error ("non-object member %qs cannot be declared %<mutable%>", name);
8890 storage_class = sc_none;
8892 else if (TREE_CODE (type) == FUNCTION_TYPE
8893 || TREE_CODE (type) == METHOD_TYPE)
8895 error ("function %qs cannot be declared %<mutable%>", name);
8896 storage_class = sc_none;
8900 error ("static %qs cannot be declared %<mutable%>", name);
8901 storage_class = sc_none;
8903 else if (type_quals & TYPE_QUAL_CONST)
8905 error ("const %qs cannot be declared %<mutable%>", name);
8906 storage_class = sc_none;
8910 /* If this is declaring a typedef name, return a TYPE_DECL. */
8911 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8915 /* Note that the grammar rejects storage classes
8916 in typenames, fields or parameters. */
8917 if (current_lang_name == lang_name_java)
8918 TYPE_FOR_JAVA (type) = 1;
8920 /* This declaration:
8922 typedef void f(int) const;
8924 declares a function type which is not a member of any
8925 particular class, but which is cv-qualified; for
8926 example "f S::*" declares a pointer to a const-qualified
8927 member function of S. We record the cv-qualification in the
8929 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8931 type = cp_build_qualified_type (type, memfn_quals);
8933 /* We have now dealt with these qualifiers. */
8934 memfn_quals = TYPE_UNQUALIFIED;
8937 if (decl_context == FIELD)
8938 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8940 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
8941 if (id_declarator && declarator->u.id.qualifying_scope) {
8942 error_at (DECL_SOURCE_LOCATION (decl),
8943 "typedef name may not be a nested-name-specifier");
8944 TREE_TYPE (decl) = error_mark_node;
8947 if (decl_context != FIELD)
8949 if (!current_function_decl)
8950 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8951 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8952 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8953 (current_function_decl)))
8954 /* The TYPE_DECL is "abstract" because there will be
8955 clones of this constructor/destructor, and there will
8956 be copies of this TYPE_DECL generated in those
8958 DECL_ABSTRACT (decl) = 1;
8960 else if (constructor_name_p (unqualified_id, current_class_type))
8961 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8962 "as enclosing class",
8965 /* If the user declares "typedef struct {...} foo" then the
8966 struct will have an anonymous name. Fill that name in now.
8967 Nothing can refer to it, so nothing needs know about the name
8969 if (type != error_mark_node
8972 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8973 && TYPE_ANONYMOUS_P (type)
8974 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8978 /* Replace the anonymous name with the real name everywhere. */
8979 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8981 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
8983 debug_hooks->set_name (t, decl);
8984 TYPE_NAME (t) = decl;
8988 if (TYPE_LANG_SPECIFIC (type))
8989 TYPE_WAS_ANONYMOUS (type) = 1;
8991 /* If this is a typedef within a template class, the nested
8992 type is a (non-primary) template. The name for the
8993 template needs updating as well. */
8994 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8995 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8996 = TYPE_IDENTIFIER (type);
8998 /* Adjust linkage now that we aren't anonymous anymore. */
8999 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
9000 determine_visibility (TYPE_MAIN_DECL (type));
9002 /* FIXME remangle member functions; member functions of a
9003 type with external linkage have external linkage. */
9007 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9008 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9010 bad_specifiers (decl, "type", virtualp,
9011 memfn_quals != TYPE_UNQUALIFIED,
9012 inlinep, friendp, raises != NULL_TREE);
9017 /* Detect the case of an array type of unspecified size
9018 which came, as such, direct from a typedef name.
9019 We must copy the type, so that the array's domain can be
9020 individually set by the object's initializer. */
9022 if (type && typedef_type
9023 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9024 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9025 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9027 /* Detect where we're using a typedef of function type to declare a
9028 function. PARMS will not be set, so we must create it now. */
9030 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9032 tree decls = NULL_TREE;
9035 for (args = TYPE_ARG_TYPES (type);
9036 args && args != void_list_node;
9037 args = TREE_CHAIN (args))
9039 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9041 TREE_CHAIN (decl) = decls;
9045 parms = nreverse (decls);
9047 if (decl_context != TYPENAME)
9049 /* A cv-qualifier-seq shall only be part of the function type
9050 for a non-static member function. [8.3.5/4 dcl.fct] */
9051 if (cp_type_quals (type) != TYPE_UNQUALIFIED
9052 && (current_class_type == NULL_TREE || staticp) )
9055 ? G_("qualified function types cannot be used to "
9056 "declare static member functions")
9057 : G_("qualified function types cannot be used to "
9058 "declare free functions"));
9059 type = TYPE_MAIN_VARIANT (type);
9062 /* The qualifiers on the function type become the qualifiers on
9063 the non-static member function. */
9064 memfn_quals |= cp_type_quals (type);
9065 type_quals = TYPE_UNQUALIFIED;
9069 /* If this is a type name (such as, in a cast or sizeof),
9070 compute the type and return it now. */
9072 if (decl_context == TYPENAME)
9074 /* Note that the grammar rejects storage classes
9075 in typenames, fields or parameters. */
9076 if (type_quals != TYPE_UNQUALIFIED)
9077 type_quals = TYPE_UNQUALIFIED;
9079 /* Special case: "friend class foo" looks like a TYPENAME context. */
9082 if (type_quals != TYPE_UNQUALIFIED)
9084 error ("type qualifiers specified for friend class declaration");
9085 type_quals = TYPE_UNQUALIFIED;
9089 error ("%<inline%> specified for friend class declaration");
9095 /* Don't allow friend declaration without a class-key. */
9096 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9097 permerror (input_location, "template parameters cannot be friends");
9098 else if (TREE_CODE (type) == TYPENAME_TYPE)
9099 permerror (input_location, "friend declaration requires class-key, "
9100 "i.e. %<friend class %T::%D%>",
9101 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9103 permerror (input_location, "friend declaration requires class-key, "
9104 "i.e. %<friend %#T%>",
9108 /* Only try to do this stuff if we didn't already give up. */
9109 if (type != integer_type_node)
9111 /* A friendly class? */
9112 if (current_class_type)
9113 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9116 error ("trying to make class %qT a friend of global scope",
9119 type = void_type_node;
9122 else if (memfn_quals)
9124 if (ctype == NULL_TREE
9125 && TREE_CODE (type) == METHOD_TYPE)
9126 ctype = TYPE_METHOD_BASETYPE (type);
9129 type = build_memfn_type (type, ctype, memfn_quals);
9130 /* Core issue #547: need to allow this in template type args. */
9131 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9132 type = cp_build_qualified_type (type, memfn_quals);
9134 error ("invalid qualifiers on non-member function type");
9139 else if (unqualified_id == NULL_TREE && decl_context != PARM
9140 && decl_context != CATCHPARM
9141 && TREE_CODE (type) != UNION_TYPE
9144 error ("abstract declarator %qT used as declaration", type);
9145 return error_mark_node;
9148 /* Only functions may be declared using an operator-function-id. */
9150 && IDENTIFIER_OPNAME_P (unqualified_id)
9151 && TREE_CODE (type) != FUNCTION_TYPE
9152 && TREE_CODE (type) != METHOD_TYPE)
9154 error ("declaration of %qD as non-function", unqualified_id);
9155 return error_mark_node;
9158 /* We don't check parameter types here because we can emit a better
9159 error message later. */
9160 if (decl_context != PARM)
9162 type = check_var_type (unqualified_id, type);
9163 if (type == error_mark_node)
9164 return error_mark_node;
9167 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9168 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9170 if (decl_context == PARM || decl_context == CATCHPARM)
9172 if (ctype || in_namespace)
9173 error ("cannot use %<::%> in parameter declaration");
9175 /* A parameter declared as an array of T is really a pointer to T.
9176 One declared as a function is really a pointer to a function.
9177 One declared as a member is really a pointer to member. */
9179 if (TREE_CODE (type) == ARRAY_TYPE)
9181 /* Transfer const-ness of array into that of type pointed to. */
9182 type = build_pointer_type (TREE_TYPE (type));
9183 type_quals = TYPE_UNQUALIFIED;
9185 else if (TREE_CODE (type) == FUNCTION_TYPE)
9186 type = build_pointer_type (type);
9192 if (decl_context == PARM)
9194 decl = cp_build_parm_decl (unqualified_id, type);
9196 bad_specifiers (decl, "parameter", virtualp,
9197 memfn_quals != TYPE_UNQUALIFIED,
9198 inlinep, friendp, raises != NULL_TREE);
9200 else if (decl_context == FIELD)
9202 /* The C99 flexible array extension. */
9203 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9204 && TYPE_DOMAIN (type) == NULL_TREE)
9206 tree itype = compute_array_index_type (dname, integer_zero_node);
9207 type = build_cplus_array_type (TREE_TYPE (type), itype);
9210 if (type == error_mark_node)
9212 /* Happens when declaring arrays of sizes which
9213 are error_mark_node, for example. */
9216 else if (in_namespace && !friendp)
9218 /* Something like struct S { int N::j; }; */
9219 error ("invalid use of %<::%>");
9220 return error_mark_node;
9222 else if (TREE_CODE (type) == FUNCTION_TYPE)
9225 tree function_context;
9229 if (ctype == NULL_TREE)
9230 ctype = current_class_type;
9232 if (ctype == NULL_TREE)
9234 error ("can't make %qD into a method -- not in a class",
9236 return error_mark_node;
9239 /* ``A union may [ ... ] not [ have ] virtual functions.''
9241 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9243 error ("function %qD declared virtual inside a union",
9245 return error_mark_node;
9248 if (NEW_DELETE_OPNAME_P (unqualified_id))
9252 error ("%qD cannot be declared virtual, since it "
9258 else if (staticp < 2)
9259 type = build_memfn_type (type, ctype, memfn_quals);
9262 /* Check that the name used for a destructor makes sense. */
9263 if (sfk == sfk_destructor)
9265 tree uqname = id_declarator->u.id.unqualified_name;
9269 gcc_assert (friendp);
9270 error ("expected qualified name in friend declaration "
9271 "for destructor %qD", uqname);
9272 return error_mark_node;
9275 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9277 error ("declaration of %qD as member of %qT",
9279 return error_mark_node;
9282 error ("a destructor cannot be %<constexpr%>");
9284 else if (sfk == sfk_constructor && friendp)
9286 error ("expected qualified name in friend declaration "
9287 "for constructor %qD",
9288 id_declarator->u.id.unqualified_name);
9289 return error_mark_node;
9292 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9293 function_context = (ctype != NULL_TREE) ?
9294 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9295 publicp = (! friendp || ! staticp)
9296 && function_context == NULL_TREE;
9297 decl = grokfndecl (ctype, type,
9298 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9299 ? unqualified_id : dname,
9302 virtualp, flags, memfn_quals, raises,
9303 friendp ? -1 : 0, friendp, publicp,
9304 inlinep || constexpr_p,
9306 funcdef_flag, template_count, in_namespace,
9307 attrlist, declarator->id_loc);
9308 if (decl == NULL_TREE)
9309 return error_mark_node;
9311 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9312 /* The decl and setting of decl_attr is also turned off. */
9313 decl = build_decl_attribute_variant (decl, decl_attr);
9316 /* [class.conv.ctor]
9318 A constructor declared without the function-specifier
9319 explicit that can be called with a single parameter
9320 specifies a conversion from the type of its first
9321 parameter to the type of its class. Such a constructor
9322 is called a converting constructor. */
9324 DECL_NONCONVERTING_P (decl) = 1;
9326 else if (TREE_CODE (type) == METHOD_TYPE)
9328 /* We only get here for friend declarations of
9329 members of other classes. */
9330 /* All method decls are public, so tell grokfndecl to set
9331 TREE_PUBLIC, also. */
9332 decl = grokfndecl (ctype, type,
9333 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9334 ? unqualified_id : dname,
9337 virtualp, flags, memfn_quals, raises,
9338 friendp ? -1 : 0, friendp, 1, 0, sfk,
9339 funcdef_flag, template_count, in_namespace,
9341 declarator->id_loc);
9342 if (decl == NULL_TREE)
9343 return error_mark_node;
9345 else if (!staticp && !dependent_type_p (type)
9346 && !COMPLETE_TYPE_P (complete_type (type))
9347 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9350 error ("field %qD has incomplete type", unqualified_id);
9352 error ("name %qT has incomplete type", type);
9354 /* If we're instantiating a template, tell them which
9355 instantiation made the field's type be incomplete. */
9356 if (current_class_type
9357 && TYPE_NAME (current_class_type)
9358 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9360 && declspecs->type == type)
9361 error (" in instantiation of template %qT",
9362 current_class_type);
9364 return error_mark_node;
9370 error ("%qE is neither function nor member function; "
9371 "cannot be declared friend", unqualified_id);
9379 /* Friends are treated specially. */
9380 if (ctype == current_class_type)
9381 ; /* We already issued a permerror. */
9382 else if (decl && DECL_NAME (decl))
9384 if (template_class_depth (current_class_type) == 0)
9386 decl = check_explicit_specialization
9387 (unqualified_id, decl, template_count,
9388 2 * funcdef_flag + 4);
9389 if (decl == error_mark_node)
9390 return error_mark_node;
9393 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9394 decl = do_friend (ctype, unqualified_id, decl,
9400 return error_mark_node;
9403 /* Structure field. It may not be a function, except for C++. */
9405 if (decl == NULL_TREE)
9411 /* An attempt is being made to initialize a non-static
9412 member. But, from [class.mem]:
9414 4 A member-declarator can contain a
9415 constant-initializer only if it declares a static
9416 member (_class.static_) of integral or enumeration
9417 type, see _class.static.data_.
9419 This used to be relatively common practice, but
9420 the rest of the compiler does not correctly
9421 handle the initialization unless the member is
9422 static so we make it static below. */
9423 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9425 permerror (input_location, "making %qD static", unqualified_id);
9429 if (uses_template_parms (type))
9430 /* We'll check at instantiation time. */
9432 else if (check_static_variable_definition (unqualified_id,
9434 /* If we just return the declaration, crashes
9435 will sometimes occur. We therefore return
9436 void_type_node, as if this was a friend
9437 declaration, to cause callers to completely
9438 ignore this declaration. */
9439 return error_mark_node;
9444 /* C++ allows static class members. All other work
9445 for this is done by grokfield. */
9446 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9447 set_linkage_for_static_data_member (decl);
9448 /* Even if there is an in-class initialization, DECL
9449 is considered undefined until an out-of-class
9450 definition is provided. */
9451 DECL_EXTERNAL (decl) = 1;
9454 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9459 error ("non-static data member %qE declared %<constexpr%>",
9461 decl = build_decl (input_location,
9462 FIELD_DECL, unqualified_id, type);
9463 DECL_NONADDRESSABLE_P (decl) = bitfield;
9464 if (bitfield && !unqualified_id)
9465 TREE_NO_WARNING (decl) = 1;
9467 if (storage_class == sc_mutable)
9469 DECL_MUTABLE_P (decl) = 1;
9470 storage_class = sc_none;
9474 bad_specifiers (decl, "field", virtualp,
9475 memfn_quals != TYPE_UNQUALIFIED,
9476 inlinep, friendp, raises != NULL_TREE);
9479 else if (TREE_CODE (type) == FUNCTION_TYPE
9480 || TREE_CODE (type) == METHOD_TYPE)
9485 if (!unqualified_id)
9486 return error_mark_node;
9488 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9489 original_name = dname;
9491 original_name = unqualified_id;
9493 if (storage_class == sc_auto)
9494 error ("storage class %<auto%> invalid for function %qs", name);
9495 else if (storage_class == sc_register)
9496 error ("storage class %<register%> invalid for function %qs", name);
9498 error ("storage class %<__thread%> invalid for function %qs", name);
9500 /* Function declaration not at top level.
9501 Storage classes other than `extern' are not allowed
9502 and `extern' makes no difference. */
9503 if (! toplevel_bindings_p ()
9504 && (storage_class == sc_static
9505 || declspecs->specs[(int)ds_inline])
9508 if (storage_class == sc_static)
9509 pedwarn (input_location, OPT_pedantic,
9510 "%<static%> specified invalid for function %qs "
9511 "declared out of global scope", name);
9513 pedwarn (input_location, OPT_pedantic,
9514 "%<inline%> specifier invalid for function %qs "
9515 "declared out of global scope", name);
9518 if (ctype != NULL_TREE
9519 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9521 error ("%q#T is not a class or a namespace", ctype);
9525 if (ctype == NULL_TREE)
9529 error ("virtual non-class function %qs", name);
9532 else if (sfk == sfk_constructor
9533 || sfk == sfk_destructor)
9536 ? "%qs defined in a non-class scope"
9537 : "%qs declared in a non-class scope", name);
9541 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9542 && !NEW_DELETE_OPNAME_P (original_name))
9543 type = build_method_type_directly (ctype,
9545 TYPE_ARG_TYPES (type));
9547 /* Record presence of `static'. */
9548 publicp = (ctype != NULL_TREE
9549 || storage_class == sc_extern
9550 || storage_class != sc_static);
9552 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9553 virtualp, flags, memfn_quals, raises,
9555 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9556 template_count, in_namespace, attrlist,
9557 declarator->id_loc);
9558 if (decl == NULL_TREE)
9559 return error_mark_node;
9563 int invalid_static = 0;
9565 /* Don't allow a static member function in a class, and forbid
9566 declaring main to be static. */
9567 if (TREE_CODE (type) == METHOD_TYPE)
9569 permerror (input_location, "cannot declare member function %qD to have "
9570 "static linkage", decl);
9573 else if (current_function_decl)
9575 /* FIXME need arm citation */
9576 error ("cannot declare static function inside another function");
9583 storage_class = sc_none;
9589 /* It's a variable. */
9591 /* An uninitialized decl with `extern' is a reference. */
9592 decl = grokvardecl (type, unqualified_id,
9595 (type_quals & TYPE_QUAL_CONST) != 0,
9596 ctype ? ctype : in_namespace);
9597 bad_specifiers (decl, "variable", virtualp,
9598 memfn_quals != TYPE_UNQUALIFIED,
9599 inlinep, friendp, raises != NULL_TREE);
9603 DECL_CONTEXT (decl) = ctype;
9606 permerror (input_location, "%<static%> may not be used when defining "
9607 "(as opposed to declaring) a static data member");
9609 storage_class = sc_none;
9611 if (storage_class == sc_register && TREE_STATIC (decl))
9613 error ("static member %qD declared %<register%>", decl);
9614 storage_class = sc_none;
9616 if (storage_class == sc_extern && pedantic)
9618 pedwarn (input_location, OPT_pedantic,
9619 "cannot explicitly declare member %q#D to have "
9620 "extern linkage", decl);
9621 storage_class = sc_none;
9626 if (storage_class == sc_extern && initialized && !funcdef_flag)
9628 if (toplevel_bindings_p ())
9630 /* It's common practice (and completely valid) to have a const
9631 be initialized and declared extern. */
9632 if (!(type_quals & TYPE_QUAL_CONST))
9633 warning (0, "%qs initialized and declared %<extern%>", name);
9637 error ("%qs has both %<extern%> and initializer", name);
9638 return error_mark_node;
9642 /* Record `register' declaration for warnings on &
9643 and in case doing stupid register allocation. */
9645 if (storage_class == sc_register)
9646 DECL_REGISTER (decl) = 1;
9647 else if (storage_class == sc_extern)
9648 DECL_THIS_EXTERN (decl) = 1;
9649 else if (storage_class == sc_static)
9650 DECL_THIS_STATIC (decl) = 1;
9652 /* Don't forget constexprness. */
9653 if (VAR_OR_FUNCTION_DECL_P (decl))
9654 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9656 /* Record constancy and volatility on the DECL itself . There's
9657 no need to do this when processing a template; we'll do this
9658 for the instantiated declaration based on the type of DECL. */
9659 if (!processing_template_decl)
9660 cp_apply_type_quals_to_decl (type_quals, decl);
9666 /* Subroutine of start_function. Ensure that each of the parameter
9667 types (as listed in PARMS) is complete, as is required for a
9668 function definition. */
9671 require_complete_types_for_parms (tree parms)
9673 for (; parms; parms = TREE_CHAIN (parms))
9675 if (dependent_type_p (TREE_TYPE (parms)))
9677 if (!VOID_TYPE_P (TREE_TYPE (parms))
9678 && complete_type_or_else (TREE_TYPE (parms), parms))
9680 relayout_decl (parms);
9681 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9684 /* grokparms or complete_type_or_else will have already issued
9686 TREE_TYPE (parms) = error_mark_node;
9690 /* Returns nonzero if T is a local variable. */
9693 local_variable_p (const_tree t)
9695 if ((TREE_CODE (t) == VAR_DECL
9696 /* A VAR_DECL with a context that is a _TYPE is a static data
9698 && !TYPE_P (CP_DECL_CONTEXT (t))
9699 /* Any other non-local variable must be at namespace scope. */
9700 && !DECL_NAMESPACE_SCOPE_P (t))
9701 || (TREE_CODE (t) == PARM_DECL))
9707 /* Like local_variable_p, but suitable for use as a tree-walking
9711 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9712 void *data ATTRIBUTE_UNUSED)
9714 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9716 else if (TYPE_P (*tp))
9723 /* Check that ARG, which is a default-argument expression for a
9724 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9725 something goes wrong. DECL may also be a _TYPE node, rather than a
9726 DECL, if there is no DECL available. */
9729 check_default_argument (tree decl, tree arg)
9734 if (TREE_CODE (arg) == DEFAULT_ARG)
9735 /* We get a DEFAULT_ARG when looking at an in-class declaration
9736 with a default argument. Ignore the argument for now; we'll
9737 deal with it after the class is complete. */
9746 decl_type = TREE_TYPE (decl);
9748 if (arg == error_mark_node
9749 || decl == error_mark_node
9750 || TREE_TYPE (arg) == error_mark_node
9751 || decl_type == error_mark_node)
9752 /* Something already went wrong. There's no need to check
9754 return error_mark_node;
9756 /* [dcl.fct.default]
9758 A default argument expression is implicitly converted to the
9760 if (!TREE_TYPE (arg)
9761 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9764 error ("default argument for %q#D has type %qT",
9765 decl, TREE_TYPE (arg));
9767 error ("default argument for parameter of type %qT has type %qT",
9768 decl_type, TREE_TYPE (arg));
9770 return error_mark_node;
9773 /* [dcl.fct.default]
9775 Local variables shall not be used in default argument
9778 The keyword `this' shall not be used in a default argument of a
9780 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9783 error ("default argument %qE uses local variable %qD", arg, var);
9784 return error_mark_node;
9791 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9794 type_is_deprecated (tree type)
9796 enum tree_code code;
9797 if (TREE_DEPRECATED (type))
9799 if (TYPE_NAME (type)
9800 && TREE_DEPRECATED (TYPE_NAME (type)))
9803 /* Do warn about using typedefs to a deprecated class. */
9804 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
9805 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
9807 code = TREE_CODE (type);
9809 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9810 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9811 || code == METHOD_TYPE || code == ARRAY_TYPE)
9812 return type_is_deprecated (TREE_TYPE (type));
9814 if (TYPE_PTRMEMFUNC_P (type))
9815 return type_is_deprecated
9816 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9821 /* Decode the list of parameter types for a function type.
9822 Given the list of things declared inside the parens,
9823 return a list of types.
9825 If this parameter does not end with an ellipsis, we append
9828 *PARMS is set to the chain of PARM_DECLs created. */
9831 grokparms (tree parmlist, tree *parms)
9833 tree result = NULL_TREE;
9834 tree decls = NULL_TREE;
9838 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9840 tree type = NULL_TREE;
9841 tree init = TREE_PURPOSE (parm);
9842 tree decl = TREE_VALUE (parm);
9845 if (parm == void_list_node)
9848 if (! decl || TREE_TYPE (decl) == error_mark_node)
9851 type = TREE_TYPE (decl);
9852 if (VOID_TYPE_P (type))
9854 if (same_type_p (type, void_type_node)
9855 && DECL_SELF_REFERENCE_P (type)
9856 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9857 /* this is a parmlist of `(void)', which is ok. */
9859 cxx_incomplete_type_error (decl, type);
9860 /* It's not a good idea to actually create parameters of
9861 type `void'; other parts of the compiler assume that a
9862 void type terminates the parameter list. */
9863 type = error_mark_node;
9864 TREE_TYPE (decl) = error_mark_node;
9867 if (type != error_mark_node
9868 && TYPE_FOR_JAVA (type)
9869 && MAYBE_CLASS_TYPE_P (type))
9871 error ("parameter %qD has Java class type", decl);
9872 type = error_mark_node;
9873 TREE_TYPE (decl) = error_mark_node;
9877 if (type != error_mark_node
9878 && (errmsg = targetm.invalid_parameter_type (type)))
9881 type = error_mark_node;
9882 TREE_TYPE (decl) = error_mark_node;
9885 if (type != error_mark_node)
9887 if (deprecated_state != DEPRECATED_SUPPRESS)
9889 tree deptype = type_is_deprecated (type);
9891 warn_deprecated_use (deptype, NULL_TREE);
9894 /* Top-level qualifiers on the parameters are
9895 ignored for function types. */
9896 type = cp_build_qualified_type (type, 0);
9897 if (TREE_CODE (type) == METHOD_TYPE)
9899 error ("parameter %qD invalidly declared method type", decl);
9900 type = build_pointer_type (type);
9901 TREE_TYPE (decl) = type;
9903 else if (abstract_virtuals_error (decl, type))
9904 any_error = 1; /* Seems like a good idea. */
9905 else if (POINTER_TYPE_P (type))
9907 /* [dcl.fct]/6, parameter types cannot contain pointers
9908 (references) to arrays of unknown bound. */
9909 tree t = TREE_TYPE (type);
9910 int ptr = TYPE_PTR_P (type);
9916 else if (TREE_CODE (t) != ARRAY_TYPE)
9918 else if (!TYPE_DOMAIN (t))
9922 if (TREE_CODE (t) == ARRAY_TYPE)
9924 ? G_("parameter %qD includes pointer to array of "
9925 "unknown bound %qT")
9926 : G_("parameter %qD includes reference to array of "
9927 "unknown bound %qT"),
9933 else if (init && !processing_template_decl)
9934 init = check_default_argument (decl, init);
9937 if (TREE_CODE (decl) == PARM_DECL
9938 && FUNCTION_PARAMETER_PACK_P (decl)
9939 && TREE_CHAIN (parm)
9940 && TREE_CHAIN (parm) != void_list_node)
9941 error ("parameter packs must be at the end of the parameter list");
9943 TREE_CHAIN (decl) = decls;
9945 result = tree_cons (init, type, result);
9947 decls = nreverse (decls);
9948 result = nreverse (result);
9950 result = chainon (result, void_list_node);
9957 /* D is a constructor or overloaded `operator='.
9959 Let T be the class in which D is declared. Then, this function
9962 -1 if D's is an ill-formed constructor or copy assignment operator
9963 whose first parameter is of type `T'.
9964 0 if D is not a copy constructor or copy assignment
9966 1 if D is a copy constructor or copy assignment operator whose
9967 first parameter is a reference to non-const qualified T.
9968 2 if D is a copy constructor or copy assignment operator whose
9969 first parameter is a reference to const qualified T.
9971 This function can be used as a predicate. Positive values indicate
9972 a copy constructor and nonzero values indicate a copy assignment
9976 copy_fn_p (const_tree d)
9982 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9984 if (TREE_CODE (d) == TEMPLATE_DECL
9985 || (DECL_TEMPLATE_INFO (d)
9986 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9987 /* Instantiations of template member functions are never copy
9988 functions. Note that member functions of templated classes are
9989 represented as template functions internally, and we must
9990 accept those as copy functions. */
9993 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9997 arg_type = TREE_VALUE (args);
9998 if (arg_type == error_mark_node)
10001 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
10003 /* Pass by value copy assignment operator. */
10006 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
10007 && !TYPE_REF_IS_RVALUE (arg_type)
10008 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10010 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10016 args = TREE_CHAIN (args);
10018 if (args && args != void_list_node && !TREE_PURPOSE (args))
10019 /* There are more non-optional args. */
10025 /* D is a constructor or overloaded `operator='.
10027 Let T be the class in which D is declared. Then, this function
10028 returns true when D is a move constructor or move assignment
10029 operator, false otherwise. */
10032 move_fn_p (const_tree d)
10036 bool result = false;
10038 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10040 if (cxx_dialect == cxx98)
10041 /* There are no move constructors if we are in C++98 mode. */
10044 if (TREE_CODE (d) == TEMPLATE_DECL
10045 || (DECL_TEMPLATE_INFO (d)
10046 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10047 /* Instantiations of template member functions are never copy
10048 functions. Note that member functions of templated classes are
10049 represented as template functions internally, and we must
10050 accept those as copy functions. */
10053 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10057 arg_type = TREE_VALUE (args);
10058 if (arg_type == error_mark_node)
10061 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10062 && TYPE_REF_IS_RVALUE (arg_type)
10063 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10067 args = TREE_CHAIN (args);
10069 if (args && args != void_list_node && !TREE_PURPOSE (args))
10070 /* There are more non-optional args. */
10076 /* Remember any special properties of member function DECL. */
10079 grok_special_member_properties (tree decl)
10083 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10086 class_type = DECL_CONTEXT (decl);
10087 if (DECL_CONSTRUCTOR_P (decl))
10089 int ctor = copy_fn_p (decl);
10091 if (!DECL_ARTIFICIAL (decl))
10092 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10098 A non-template constructor for class X is a copy
10099 constructor if its first parameter is of type X&, const
10100 X&, volatile X& or const volatile X&, and either there
10101 are no other parameters or else all other parameters have
10102 default arguments. */
10103 TYPE_HAS_INIT_REF (class_type) = 1;
10104 if (user_provided_p (decl))
10105 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
10107 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
10109 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10111 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10112 if (user_provided_p (decl))
10113 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10115 else if (is_list_ctor (decl))
10116 TYPE_HAS_LIST_CTOR (class_type) = 1;
10118 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10122 A non-template assignment operator for class X is a copy
10123 assignment operator if its parameter is of type X, X&, const
10124 X&, volatile X& or const volatile X&. */
10126 int assop = copy_fn_p (decl);
10130 TYPE_HAS_ASSIGN_REF (class_type) = 1;
10131 if (user_provided_p (decl))
10132 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
10134 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
10139 /* Check a constructor DECL has the correct form. Complains
10140 if the class has a constructor of the form X(X). */
10143 grok_ctor_properties (const_tree ctype, const_tree decl)
10145 int ctor_parm = copy_fn_p (decl);
10151 A declaration of a constructor for a class X is ill-formed if
10152 its first parameter is of type (optionally cv-qualified) X
10153 and either there are no other parameters or else all other
10154 parameters have default arguments.
10156 We *don't* complain about member template instantiations that
10157 have this form, though; they can occur as we try to decide
10158 what constructor to use during overload resolution. Since
10159 overload resolution will never prefer such a constructor to
10160 the non-template copy constructor (which is either explicitly
10161 or implicitly defined), there's no need to worry about their
10162 existence. Theoretically, they should never even be
10163 instantiated, but that's hard to forestall. */
10164 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10172 /* An operator with this code is unary, but can also be binary. */
10175 ambi_op_p (enum tree_code code)
10177 return (code == INDIRECT_REF
10178 || code == ADDR_EXPR
10179 || code == UNARY_PLUS_EXPR
10180 || code == NEGATE_EXPR
10181 || code == PREINCREMENT_EXPR
10182 || code == PREDECREMENT_EXPR);
10185 /* An operator with this name can only be unary. */
10188 unary_op_p (enum tree_code code)
10190 return (code == TRUTH_NOT_EXPR
10191 || code == BIT_NOT_EXPR
10192 || code == COMPONENT_REF
10193 || code == TYPE_EXPR);
10196 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10197 errors are issued for invalid declarations. */
10200 grok_op_properties (tree decl, bool complain)
10202 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10204 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10205 tree name = DECL_NAME (decl);
10206 enum tree_code operator_code;
10211 /* Count the number of arguments and check for ellipsis. */
10212 for (argtype = argtypes, arity = 0;
10213 argtype && argtype != void_list_node;
10214 argtype = TREE_CHAIN (argtype))
10216 ellipsis_p = !argtype;
10218 class_type = DECL_CONTEXT (decl);
10219 if (class_type && !CLASS_TYPE_P (class_type))
10220 class_type = NULL_TREE;
10222 if (DECL_CONV_FN_P (decl))
10223 operator_code = TYPE_EXPR;
10227 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10228 if (ansi_opname (CODE) == name) \
10230 operator_code = (CODE); \
10233 else if (ansi_assopname (CODE) == name) \
10235 operator_code = (CODE); \
10236 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10240 #include "operators.def"
10241 #undef DEF_OPERATOR
10243 gcc_unreachable ();
10246 gcc_assert (operator_code != MAX_TREE_CODES);
10247 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10250 switch (operator_code)
10253 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10257 TYPE_GETS_DELETE (class_type) |= 1;
10261 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10264 case VEC_DELETE_EXPR:
10265 TYPE_GETS_DELETE (class_type) |= 2;
10272 /* [basic.std.dynamic.allocation]/1:
10274 A program is ill-formed if an allocation function is declared
10275 in a namespace scope other than global scope or declared static
10278 The same also holds true for deallocation functions. */
10279 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10280 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10282 if (DECL_NAMESPACE_SCOPE_P (decl))
10284 if (CP_DECL_CONTEXT (decl) != global_namespace)
10286 error ("%qD may not be declared within a namespace", decl);
10289 else if (!TREE_PUBLIC (decl))
10291 error ("%qD may not be declared as static", decl);
10297 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10299 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10300 DECL_IS_OPERATOR_NEW (decl) = 1;
10302 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10303 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10306 /* An operator function must either be a non-static member function
10307 or have at least one parameter of a class, a reference to a class,
10308 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10309 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10311 if (operator_code == TYPE_EXPR
10312 || operator_code == CALL_EXPR
10313 || operator_code == COMPONENT_REF
10314 || operator_code == ARRAY_REF
10315 || operator_code == NOP_EXPR)
10317 if (class_type && LAMBDA_TYPE_P (class_type))
10318 /* Lambdas can have static op() and conv ops. */;
10321 error ("%qD must be a nonstatic member function", decl);
10329 if (DECL_STATIC_FUNCTION_P (decl))
10331 error ("%qD must be either a non-static member "
10332 "function or a non-member function", decl);
10336 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10338 tree arg = non_reference (TREE_VALUE (p));
10339 if (arg == error_mark_node)
10342 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10343 because these checks are performed even on
10344 template functions. */
10345 if (MAYBE_CLASS_TYPE_P (arg)
10346 || TREE_CODE (arg) == ENUMERAL_TYPE)
10350 if (!p || p == void_list_node)
10353 error ("%qD must have an argument of class or "
10354 "enumerated type", decl);
10360 /* There are no restrictions on the arguments to an overloaded
10362 if (operator_code == CALL_EXPR)
10365 /* Warn about conversion operators that will never be used. */
10366 if (IDENTIFIER_TYPENAME_P (name)
10367 && ! DECL_TEMPLATE_INFO (decl)
10369 /* Warn only declaring the function; there is no need to
10370 warn again about out-of-class definitions. */
10371 && class_type == current_class_type)
10373 tree t = TREE_TYPE (name);
10374 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10377 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10379 if (TREE_CODE (t) == VOID_TYPE)
10380 warning (OPT_Wconversion,
10382 ? G_("conversion to a reference to void "
10383 "will never use a type conversion operator")
10384 : G_("conversion to void "
10385 "will never use a type conversion operator"));
10386 else if (class_type)
10388 if (t == class_type)
10389 warning (OPT_Wconversion,
10391 ? G_("conversion to a reference to the same type "
10392 "will never use a type conversion operator")
10393 : G_("conversion to the same type "
10394 "will never use a type conversion operator"));
10395 /* Don't force t to be complete here. */
10396 else if (MAYBE_CLASS_TYPE_P (t)
10397 && COMPLETE_TYPE_P (t)
10398 && DERIVED_FROM_P (t, class_type))
10399 warning (OPT_Wconversion,
10401 ? G_("conversion to a reference to a base class "
10402 "will never use a type conversion operator")
10403 : G_("conversion to a base class "
10404 "will never use a type conversion operator"));
10409 if (operator_code == COND_EXPR)
10412 error ("ISO C++ prohibits overloading operator ?:");
10415 else if (ellipsis_p)
10417 error ("%qD must not have variable number of arguments", decl);
10420 else if (ambi_op_p (operator_code))
10423 /* We pick the one-argument operator codes by default, so
10424 we don't have to change anything. */
10426 else if (arity == 2)
10428 /* If we thought this was a unary operator, we now know
10429 it to be a binary operator. */
10430 switch (operator_code)
10433 operator_code = MULT_EXPR;
10437 operator_code = BIT_AND_EXPR;
10440 case UNARY_PLUS_EXPR:
10441 operator_code = PLUS_EXPR;
10445 operator_code = MINUS_EXPR;
10448 case PREINCREMENT_EXPR:
10449 operator_code = POSTINCREMENT_EXPR;
10452 case PREDECREMENT_EXPR:
10453 operator_code = POSTDECREMENT_EXPR;
10457 gcc_unreachable ();
10460 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10462 if ((operator_code == POSTINCREMENT_EXPR
10463 || operator_code == POSTDECREMENT_EXPR)
10464 && ! processing_template_decl
10465 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10468 error ("postfix %qD must take %<int%> as its argument",
10471 error ("postfix %qD must take %<int%> as its second "
10479 error ("%qD must take either zero or one argument", decl);
10481 error ("%qD must take either one or two arguments", decl);
10485 /* More Effective C++ rule 6. */
10487 && (operator_code == POSTINCREMENT_EXPR
10488 || operator_code == POSTDECREMENT_EXPR
10489 || operator_code == PREINCREMENT_EXPR
10490 || operator_code == PREDECREMENT_EXPR))
10492 tree arg = TREE_VALUE (argtypes);
10493 tree ret = TREE_TYPE (TREE_TYPE (decl));
10494 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10495 arg = TREE_TYPE (arg);
10496 arg = TYPE_MAIN_VARIANT (arg);
10497 if (operator_code == PREINCREMENT_EXPR
10498 || operator_code == PREDECREMENT_EXPR)
10500 if (TREE_CODE (ret) != REFERENCE_TYPE
10501 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10503 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10504 build_reference_type (arg));
10508 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10509 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10513 else if (unary_op_p (operator_code))
10518 error ("%qD must take %<void%>", decl);
10520 error ("%qD must take exactly one argument", decl);
10524 else /* if (binary_op_p (operator_code)) */
10529 error ("%qD must take exactly one argument", decl);
10531 error ("%qD must take exactly two arguments", decl);
10535 /* More Effective C++ rule 7. */
10537 && (operator_code == TRUTH_ANDIF_EXPR
10538 || operator_code == TRUTH_ORIF_EXPR
10539 || operator_code == COMPOUND_EXPR))
10540 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10544 /* Effective C++ rule 23. */
10547 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10548 && (operator_code == PLUS_EXPR
10549 || operator_code == MINUS_EXPR
10550 || operator_code == TRUNC_DIV_EXPR
10551 || operator_code == MULT_EXPR
10552 || operator_code == TRUNC_MOD_EXPR)
10553 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10554 warning (OPT_Weffc__, "%qD should return by value", decl);
10556 /* [over.oper]/8 */
10557 for (; argtypes && argtypes != void_list_node;
10558 argtypes = TREE_CHAIN (argtypes))
10559 if (TREE_PURPOSE (argtypes))
10561 TREE_PURPOSE (argtypes) = NULL_TREE;
10562 if (operator_code == POSTINCREMENT_EXPR
10563 || operator_code == POSTDECREMENT_EXPR)
10565 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10570 error ("%qD cannot have default arguments", decl);
10578 /* Return a string giving the keyword associate with CODE. */
10580 static const char *
10581 tag_name (enum tag_types code)
10593 case typename_type:
10596 gcc_unreachable ();
10600 /* Name lookup in an elaborated-type-specifier (after the keyword
10601 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10602 elaborated-type-specifier is invalid, issue a diagnostic and return
10603 error_mark_node; otherwise, return the *_TYPE to which it referred.
10604 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10607 check_elaborated_type_specifier (enum tag_types tag_code,
10609 bool allow_template_p)
10615 struct S { struct S *p; };
10617 name lookup will find the TYPE_DECL for the implicit "S::S"
10618 typedef. Adjust for that here. */
10619 if (DECL_SELF_REFERENCE_P (decl))
10620 decl = TYPE_NAME (TREE_TYPE (decl));
10622 type = TREE_TYPE (decl);
10624 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10625 is false for this case as well. */
10626 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10628 error ("using template type parameter %qT after %qs",
10629 type, tag_name (tag_code));
10630 return error_mark_node;
10634 If the identifier resolves to a typedef-name or a template
10635 type-parameter, the elaborated-type-specifier is ill-formed.
10637 In other words, the only legitimate declaration to use in the
10638 elaborated type specifier is the implicit typedef created when
10639 the type is declared. */
10640 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10641 && !DECL_SELF_REFERENCE_P (decl)
10642 && tag_code != typename_type)
10644 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10645 error ("%q+D has a previous declaration here", decl);
10646 return error_mark_node;
10648 else if (TREE_CODE (type) != RECORD_TYPE
10649 && TREE_CODE (type) != UNION_TYPE
10650 && tag_code != enum_type
10651 && tag_code != typename_type)
10653 error ("%qT referred to as %qs", type, tag_name (tag_code));
10654 error ("%q+T has a previous declaration here", type);
10655 return error_mark_node;
10657 else if (TREE_CODE (type) != ENUMERAL_TYPE
10658 && tag_code == enum_type)
10660 error ("%qT referred to as enum", type);
10661 error ("%q+T has a previous declaration here", type);
10662 return error_mark_node;
10664 else if (!allow_template_p
10665 && TREE_CODE (type) == RECORD_TYPE
10666 && CLASSTYPE_IS_TEMPLATE (type))
10668 /* If a class template appears as elaborated type specifier
10669 without a template header such as:
10671 template <class T> class C {};
10672 void f(class C); // No template header here
10674 then the required template argument is missing. */
10675 error ("template argument required for %<%s %T%>",
10676 tag_name (tag_code),
10677 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10678 return error_mark_node;
10684 /* Lookup NAME in elaborate type specifier in scope according to
10685 SCOPE and issue diagnostics if necessary.
10686 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10687 found, and ERROR_MARK_NODE for type error. */
10690 lookup_and_check_tag (enum tag_types tag_code, tree name,
10691 tag_scope scope, bool template_header_p)
10695 if (scope == ts_global)
10697 /* First try ordinary name lookup, ignoring hidden class name
10698 injected via friend declaration. */
10699 decl = lookup_name_prefer_type (name, 2);
10700 /* If that fails, the name will be placed in the smallest
10701 non-class, non-function-prototype scope according to 3.3.1/5.
10702 We may already have a hidden name declared as friend in this
10703 scope. So lookup again but not ignoring hidden names.
10704 If we find one, that name will be made visible rather than
10705 creating a new tag. */
10707 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10710 decl = lookup_type_scope (name, scope);
10712 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10713 decl = DECL_TEMPLATE_RESULT (decl);
10715 if (decl && TREE_CODE (decl) == TYPE_DECL)
10717 /* Look for invalid nested type:
10721 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10723 error ("%qD has the same name as the class in which it is "
10726 return error_mark_node;
10729 /* Two cases we need to consider when deciding if a class
10730 template is allowed as an elaborated type specifier:
10731 1. It is a self reference to its own class.
10732 2. It comes with a template header.
10736 template <class T> class C {
10737 class C *c1; // DECL_SELF_REFERENCE_P is true
10740 template <class U> class C; // template_header_p is true
10741 template <class T> class C<T>::D {
10742 class C *c2; // DECL_SELF_REFERENCE_P is true
10745 t = check_elaborated_type_specifier (tag_code,
10748 | DECL_SELF_REFERENCE_P (decl));
10751 else if (decl && TREE_CODE (decl) == TREE_LIST)
10753 error ("reference to %qD is ambiguous", name);
10754 print_candidates (decl);
10755 return error_mark_node;
10761 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10762 Define the tag as a forward-reference if it is not defined.
10764 If a declaration is given, process it here, and report an error if
10765 multiple declarations are not identical.
10767 SCOPE is TS_CURRENT when this is also a definition. Only look in
10768 the current frame for the name (since C++ allows new names in any
10769 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10770 declaration. Only look beginning from the current scope outward up
10771 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10773 TEMPLATE_HEADER_P is true when this declaration is preceded by
10774 a set of template parameters. */
10777 xref_tag (enum tag_types tag_code, tree name,
10778 tag_scope scope, bool template_header_p)
10780 enum tree_code code;
10782 tree context = NULL_TREE;
10784 timevar_push (TV_NAME_LOOKUP);
10786 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10792 code = RECORD_TYPE;
10798 code = ENUMERAL_TYPE;
10801 gcc_unreachable ();
10804 /* In case of anonymous name, xref_tag is only called to
10805 make type node and push name. Name lookup is not required. */
10806 if (ANON_AGGRNAME_P (name))
10809 t = lookup_and_check_tag (tag_code, name,
10810 scope, template_header_p);
10812 if (t == error_mark_node)
10813 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10815 if (scope != ts_current && t && current_class_type
10816 && template_class_depth (current_class_type)
10817 && template_header_p)
10819 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10820 definition of this tag. Since, in addition, we are currently
10821 processing a (member) template declaration of a template
10822 class, we must be very careful; consider:
10829 { template <class V>
10830 friend struct S1; };
10832 Here, the S2::S1 declaration should not be confused with the
10833 outer declaration. In particular, the inner version should
10834 have a template parameter of level 2, not level 1. This
10835 would be particularly important if the member declaration
10838 template <class V = U> friend struct S1;
10840 say, when we should tsubst into `U' when instantiating
10841 S2. On the other hand, when presented with:
10851 we must find the inner binding eventually. We
10852 accomplish this by making sure that the new type we
10853 create to represent this declaration has the right
10855 context = TYPE_CONTEXT (t);
10861 /* If no such tag is yet defined, create a forward-reference node
10862 and record it as the "definition".
10863 When a real declaration of this type is found,
10864 the forward-reference will be altered into a real type. */
10865 if (code == ENUMERAL_TYPE)
10867 error ("use of enum %q#D without previous declaration", name);
10868 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10872 t = make_class_type (code);
10873 TYPE_CONTEXT (t) = context;
10874 t = pushtag (name, t, scope);
10879 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10881 if (!redeclare_class_template (t, current_template_parms))
10882 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10884 else if (!processing_template_decl
10885 && CLASS_TYPE_P (t)
10886 && CLASSTYPE_IS_TEMPLATE (t))
10888 error ("redeclaration of %qT as a non-template", t);
10889 error ("previous declaration %q+D", t);
10890 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10893 /* Make injected friend class visible. */
10894 if (scope != ts_within_enclosing_non_class
10895 && hidden_name_p (TYPE_NAME (t)))
10897 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10898 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10900 if (TYPE_TEMPLATE_INFO (t))
10902 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10903 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10908 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10912 xref_tag_from_type (tree old, tree id, tag_scope scope)
10914 enum tag_types tag_kind;
10916 if (TREE_CODE (old) == RECORD_TYPE)
10917 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10919 tag_kind = union_type;
10921 if (id == NULL_TREE)
10922 id = TYPE_IDENTIFIER (old);
10924 return xref_tag (tag_kind, id, scope, false);
10927 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10928 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10929 access_* node, and the TREE_VALUE is the type of the base-class.
10930 Non-NULL TREE_TYPE indicates virtual inheritance.
10932 Returns true if the binfo hierarchy was successfully created,
10933 false if an error was detected. */
10936 xref_basetypes (tree ref, tree base_list)
10939 tree binfo, base_binfo;
10940 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10941 unsigned max_bases = 0; /* Maximum direct bases. */
10943 tree default_access;
10944 tree igo_prev; /* Track Inheritance Graph Order. */
10946 if (ref == error_mark_node)
10949 /* The base of a derived class is private by default, all others are
10951 default_access = (TREE_CODE (ref) == RECORD_TYPE
10952 && CLASSTYPE_DECLARED_CLASS (ref)
10953 ? access_private_node : access_public_node);
10955 /* First, make sure that any templates in base-classes are
10956 instantiated. This ensures that if we call ourselves recursively
10957 we do not get confused about which classes are marked and which
10959 basep = &base_list;
10962 tree basetype = TREE_VALUE (*basep);
10964 if (!(processing_template_decl && uses_template_parms (basetype))
10965 && !complete_type_or_else (basetype, NULL))
10966 /* An incomplete type. Remove it from the list. */
10967 *basep = TREE_CHAIN (*basep);
10971 if (TREE_TYPE (*basep))
10973 if (CLASS_TYPE_P (basetype))
10974 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10975 basep = &TREE_CHAIN (*basep);
10979 TYPE_MARKED_P (ref) = 1;
10981 /* The binfo slot should be empty, unless this is an (ill-formed)
10983 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10984 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10986 binfo = make_tree_binfo (max_bases);
10988 TYPE_BINFO (ref) = binfo;
10989 BINFO_OFFSET (binfo) = size_zero_node;
10990 BINFO_TYPE (binfo) = ref;
10992 /* Apply base-class info set up to the variants of this type. */
10993 fixup_type_variants (ref);
10997 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10998 /* An aggregate cannot have baseclasses. */
10999 CLASSTYPE_NON_AGGREGATE (ref) = 1;
11001 if (TREE_CODE (ref) == UNION_TYPE)
11003 error ("derived union %qT invalid", ref);
11010 if (TYPE_FOR_JAVA (ref))
11012 error ("Java class %qT cannot have multiple bases", ref);
11019 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11021 if (TYPE_FOR_JAVA (ref))
11023 error ("Java class %qT cannot have virtual bases", ref);
11028 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11030 tree access = TREE_PURPOSE (base_list);
11031 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11032 tree basetype = TREE_VALUE (base_list);
11034 if (access == access_default_node)
11035 access = default_access;
11037 if (PACK_EXPANSION_P (basetype))
11038 basetype = PACK_EXPANSION_PATTERN (basetype);
11039 if (TREE_CODE (basetype) == TYPE_DECL)
11040 basetype = TREE_TYPE (basetype);
11041 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11043 error ("base type %qT fails to be a struct or class type",
11048 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11049 TYPE_FOR_JAVA (ref) = 1;
11051 base_binfo = NULL_TREE;
11052 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11054 base_binfo = TYPE_BINFO (basetype);
11055 /* The original basetype could have been a typedef'd type. */
11056 basetype = BINFO_TYPE (base_binfo);
11058 /* Inherit flags from the base. */
11059 TYPE_HAS_NEW_OPERATOR (ref)
11060 |= TYPE_HAS_NEW_OPERATOR (basetype);
11061 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11062 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11063 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11064 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11065 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11066 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11067 CLASSTYPE_REPEATED_BASE_P (ref)
11068 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11071 /* We must do this test after we've seen through a typedef
11073 if (TYPE_MARKED_P (basetype))
11075 if (basetype == ref)
11076 error ("recursive type %qT undefined", basetype);
11078 error ("duplicate base type %qT invalid", basetype);
11082 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11083 /* Regenerate the pack expansion for the bases. */
11084 basetype = make_pack_expansion (basetype);
11086 TYPE_MARKED_P (basetype) = 1;
11088 base_binfo = copy_binfo (base_binfo, basetype, ref,
11089 &igo_prev, via_virtual);
11090 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11091 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11093 BINFO_BASE_APPEND (binfo, base_binfo);
11094 BINFO_BASE_ACCESS_APPEND (binfo, access);
11097 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11098 /* If we have space in the vbase vector, we must have shared at
11099 least one of them, and are therefore diamond shaped. */
11100 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11102 /* Unmark all the types. */
11103 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11104 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11105 TYPE_MARKED_P (ref) = 0;
11107 /* Now see if we have a repeated base type. */
11108 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11110 for (base_binfo = binfo; base_binfo;
11111 base_binfo = TREE_CHAIN (base_binfo))
11113 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11115 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11118 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11120 for (base_binfo = binfo; base_binfo;
11121 base_binfo = TREE_CHAIN (base_binfo))
11122 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11123 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11132 /* Begin compiling the definition of an enumeration type.
11135 UNDERLYING_TYPE is the type that will be used as the storage for
11136 the enumeration type. This should be NULL_TREE if no storage type
11139 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11141 Returns the type object, as yet incomplete.
11142 Also records info about it so that build_enumerator
11143 may be used to declare the individual values as they are read. */
11146 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
11150 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11152 /* If this is the real definition for a previous forward reference,
11153 fill in the contents in the same object that used to be the
11154 forward reference. */
11156 enumtype = lookup_and_check_tag (enum_type, name,
11157 /*tag_scope=*/ts_current,
11158 /*template_header_p=*/false);
11160 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11162 error_at (input_location, "multiple definition of %q#T", enumtype);
11163 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11164 "previous definition here");
11165 /* Clear out TYPE_VALUES, and start again. */
11166 TYPE_VALUES (enumtype) = NULL_TREE;
11170 /* In case of error, make a dummy enum to allow parsing to
11172 if (enumtype == error_mark_node)
11173 name = make_anon_name ();
11175 enumtype = cxx_make_type (ENUMERAL_TYPE);
11176 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11179 if (enumtype == error_mark_node)
11184 SET_SCOPED_ENUM_P (enumtype, 1);
11185 begin_scope (sk_scoped_enum, enumtype);
11187 /* [C++0x dcl.enum]p5:
11189 If not explicitly specified, the underlying type of a scoped
11190 enumeration type is int. */
11191 if (!underlying_type)
11192 underlying_type = integer_type_node;
11195 if (underlying_type)
11197 if (CP_INTEGRAL_TYPE_P (underlying_type))
11199 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11200 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11201 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11202 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11203 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11204 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11205 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11206 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11207 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11208 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11210 else if (!dependent_type_p (underlying_type))
11211 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11212 underlying_type, enumtype);
11218 /* After processing and defining all the values of an enumeration type,
11219 install their decls in the enumeration type and finish it off.
11220 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11223 finish_enum (tree enumtype)
11232 bool use_short_enum;
11237 tree underlying_type = NULL_TREE;
11238 bool fixed_underlying_type_p
11239 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11241 /* We built up the VALUES in reverse order. */
11242 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11244 /* For an enum defined in a template, just set the type of the values;
11245 all further processing is postponed until the template is
11246 instantiated. We need to set the type so that tsubst of a CONST_DECL
11248 if (processing_template_decl)
11250 for (values = TYPE_VALUES (enumtype);
11252 values = TREE_CHAIN (values))
11253 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11254 if (at_function_scope_p ())
11255 add_stmt (build_min (TAG_DEFN, enumtype));
11256 if (SCOPED_ENUM_P (enumtype))
11261 /* Determine the minimum and maximum values of the enumerators. */
11262 if (TYPE_VALUES (enumtype))
11264 minnode = maxnode = NULL_TREE;
11266 for (values = TYPE_VALUES (enumtype);
11268 values = TREE_CHAIN (values))
11270 decl = TREE_VALUE (values);
11272 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11273 each enumerator has the type of its enumeration. Prior to the
11274 closing brace, the type of each enumerator is the type of its
11275 initializing value. */
11276 TREE_TYPE (decl) = enumtype;
11278 /* Update the minimum and maximum values, if appropriate. */
11279 value = DECL_INITIAL (decl);
11280 if (value == error_mark_node)
11281 value = integer_zero_node;
11282 /* Figure out what the minimum and maximum values of the
11283 enumerators are. */
11285 minnode = maxnode = value;
11286 else if (tree_int_cst_lt (maxnode, value))
11288 else if (tree_int_cst_lt (value, minnode))
11295 If the enumerator-list is empty, the underlying type is as if
11296 the enumeration had a single enumerator with value 0. */
11297 minnode = maxnode = integer_zero_node;
11299 /* Compute the number of bits require to represent all values of the
11300 enumeration. We must do this before the type of MINNODE and
11301 MAXNODE are transformed, since tree_int_cst_min_precision relies
11302 on the TREE_TYPE of the value it is passed. */
11303 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11304 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11305 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11306 precision = MAX (lowprec, highprec);
11308 if (!fixed_underlying_type_p)
11310 /* Determine the underlying type of the enumeration.
11314 The underlying type of an enumeration is an integral type that
11315 can represent all the enumerator values defined in the
11316 enumeration. It is implementation-defined which integral type is
11317 used as the underlying type for an enumeration except that the
11318 underlying type shall not be larger than int unless the value of
11319 an enumerator cannot fit in an int or unsigned int.
11321 We use "int" or an "unsigned int" as the underlying type, even if
11322 a smaller integral type would work, unless the user has
11323 explicitly requested that we use the smallest possible type. The
11324 user can request that for all enumerations with a command line
11325 flag, or for just one enumeration with an attribute. */
11327 use_short_enum = flag_short_enums
11328 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11330 for (itk = (use_short_enum ? itk_char : itk_int);
11334 underlying_type = integer_types[itk];
11335 if (TYPE_PRECISION (underlying_type) >= precision
11336 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11339 if (itk == itk_none)
11343 IF no integral type can represent all the enumerator values, the
11344 enumeration is ill-formed. */
11345 error ("no integral type can represent all of the enumerator values "
11346 "for %qT", enumtype);
11347 precision = TYPE_PRECISION (long_long_integer_type_node);
11348 underlying_type = integer_types[itk_unsigned_long_long];
11353 The value of sizeof() applied to an enumeration type, an object
11354 of an enumeration type, or an enumerator, is the value of sizeof()
11355 applied to the underlying type. */
11356 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11357 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11358 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11359 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11360 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11361 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11363 /* Set the underlying type of the enumeration type to the
11364 computed enumeration type, restricted to the enumerator
11366 ENUM_UNDERLYING_TYPE (enumtype)
11367 = build_distinct_type_copy (underlying_type);
11368 set_min_and_max_values_for_integral_type
11369 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11372 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11374 /* Compute the minimum and maximum values for the type.
11378 For an enumeration where emin is the smallest enumerator and emax
11379 is the largest, the values of the enumeration are the values of the
11380 underlying type in the range bmin to bmax, where bmin and bmax are,
11381 respectively, the smallest and largest values of the smallest bit-
11382 field that can store emin and emax. */
11384 /* The middle-end currently assumes that types with TYPE_PRECISION
11385 narrower than their underlying type are suitably zero or sign
11386 extended to fill their mode. g++ doesn't make these guarantees.
11387 Until the middle-end can represent such paradoxical types, we
11388 set the TYPE_PRECISION to the width of the underlying type. */
11389 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11391 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11393 /* Convert each of the enumerators to the type of the underlying
11394 type of the enumeration. */
11395 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11397 location_t saved_location;
11399 decl = TREE_VALUE (values);
11400 saved_location = input_location;
11401 input_location = DECL_SOURCE_LOCATION (decl);
11402 if (fixed_underlying_type_p)
11403 /* If the enumeration type has a fixed underlying type, we
11404 already checked all of the enumerator values. */
11405 value = DECL_INITIAL (decl);
11407 value = perform_implicit_conversion (underlying_type,
11408 DECL_INITIAL (decl),
11409 tf_warning_or_error);
11410 input_location = saved_location;
11412 /* Do not clobber shared ints. */
11413 value = copy_node (value);
11415 TREE_TYPE (value) = enumtype;
11416 DECL_INITIAL (decl) = value;
11419 /* Fix up all variant types of this enum type. */
11420 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11422 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11423 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11424 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11425 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11426 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11427 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11428 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11429 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11430 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11431 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11432 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11435 /* Finish up the scope of a scoped enumeration. */
11436 if (SCOPED_ENUM_P (enumtype))
11439 /* Finish debugging output for this type. */
11440 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11443 /* Build and install a CONST_DECL for an enumeration constant of the
11444 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11445 Assignment of sequential values by default is handled here. */
11448 build_enumerator (tree name, tree value, tree enumtype)
11454 /* If the VALUE was erroneous, pretend it wasn't there; that will
11455 result in the enum being assigned the next value in sequence. */
11456 if (value == error_mark_node)
11459 /* Remove no-op casts from the value. */
11461 STRIP_TYPE_NOPS (value);
11463 if (! processing_template_decl)
11465 /* Validate and default VALUE. */
11466 if (value != NULL_TREE)
11468 value = integral_constant_value (value);
11470 if (TREE_CODE (value) == INTEGER_CST)
11472 value = perform_integral_promotions (value);
11473 constant_expression_warning (value);
11477 error ("enumerator value for %qD is not an integer constant", name);
11482 /* Default based on previous value. */
11483 if (value == NULL_TREE)
11485 if (TYPE_VALUES (enumtype))
11488 unsigned HOST_WIDE_INT lo;
11492 /* The next value is the previous value plus one.
11493 add_double doesn't know the type of the target expression,
11494 so we must check with int_fits_type_p as well. */
11495 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11496 if (error_operand_p (prev_value))
11497 value = error_mark_node;
11500 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11501 TREE_INT_CST_HIGH (prev_value),
11503 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11505 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11509 error ("overflow in enumeration values at %qD", name);
11510 value = error_mark_node;
11515 value = integer_zero_node;
11518 /* Remove no-op casts from the value. */
11519 STRIP_TYPE_NOPS (value);
11521 /* If the underlying type of the enum is fixed, check whether
11522 the enumerator values fits in the underlying type. If it
11523 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11524 if (ENUM_UNDERLYING_TYPE (enumtype)
11526 && TREE_CODE (value) == INTEGER_CST
11527 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11529 error ("enumerator value %E is too large for underlying type %<%T%>",
11530 value, ENUM_UNDERLYING_TYPE (enumtype));
11532 /* Silently convert the value so that we can continue. */
11533 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11538 /* C++ associates enums with global, function, or class declarations. */
11539 context = current_scope ();
11541 /* Build the actual enumeration constant. Note that the enumeration
11542 constants have the underlying type of the enum (if it is fixed)
11543 or the type of their initializer (if the underlying type of the
11544 enum is not fixed):
11548 If the underlying type is fixed, the type of each enumerator
11549 prior to the closing brace is the underlying type; if the
11550 initializing value of an enumerator cannot be represented by
11551 the underlying type, the program is ill-formed. If the
11552 underlying type is not fixed, the type of each enumerator is
11553 the type of its initializing value.
11555 If the underlying type is not fixed, it will be computed by
11556 finish_enum and we will reset the type of this enumerator. Of
11557 course, if we're processing a template, there may be no value. */
11558 type = value ? TREE_TYPE (value) : NULL_TREE;
11560 if (context && context == current_class_type)
11561 /* This enum declaration is local to the class. We need the full
11562 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11563 decl = build_lang_decl (CONST_DECL, name, type);
11565 /* It's a global enum, or it's local to a function. (Note local to
11566 a function could mean local to a class method. */
11567 decl = build_decl (input_location, CONST_DECL, name, type);
11569 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11570 TREE_CONSTANT (decl) = 1;
11571 TREE_READONLY (decl) = 1;
11572 DECL_INITIAL (decl) = value;
11574 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11575 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11576 on the TYPE_FIELDS list for `S'. (That's so that you can say
11577 things like `S::i' later.) */
11578 finish_member_declaration (decl);
11582 /* Add this enumeration constant to the list for this type. */
11583 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11586 /* Look for an enumerator with the given NAME within the enumeration
11587 type ENUMTYPE. This routine is used primarily for qualified name
11588 lookup into an enumerator in C++0x, e.g.,
11590 enum class Color { Red, Green, Blue };
11592 Color color = Color::Red;
11594 Returns the value corresponding to the enumerator, or
11595 NULL_TREE if no such enumerator was found. */
11597 lookup_enumerator (tree enumtype, tree name)
11600 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11602 e = purpose_member (name, TYPE_VALUES (enumtype));
11603 return e? TREE_VALUE (e) : NULL_TREE;
11607 /* We're defining DECL. Make sure that its type is OK. */
11610 check_function_type (tree decl, tree current_function_parms)
11612 tree fntype = TREE_TYPE (decl);
11613 tree return_type = complete_type (TREE_TYPE (fntype));
11615 /* In a function definition, arg types must be complete. */
11616 require_complete_types_for_parms (current_function_parms);
11618 /* constexpr functions must have literal argument types and
11619 literal return type. */
11620 validate_constexpr_fundecl (decl);
11622 if (dependent_type_p (return_type))
11624 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11625 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11627 tree args = TYPE_ARG_TYPES (fntype);
11629 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11630 error ("return type %q#T is incomplete", return_type);
11632 error ("return type has Java class type %q#T", return_type);
11634 /* Make it return void instead. */
11635 if (TREE_CODE (fntype) == METHOD_TYPE)
11636 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11638 TREE_CHAIN (args));
11640 fntype = build_function_type (void_type_node, args);
11642 = build_exception_variant (fntype,
11643 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11644 fntype = (cp_build_type_attribute_variant
11645 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11646 TREE_TYPE (decl) = fntype;
11649 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11652 /* Create the FUNCTION_DECL for a function definition.
11653 DECLSPECS and DECLARATOR are the parts of the declaration;
11654 they describe the function's name and the type it returns,
11655 but twisted together in a fashion that parallels the syntax of C.
11657 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11658 DECLARATOR is really the DECL for the function we are about to
11659 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11660 indicating that the function is an inline defined in-class.
11662 This function creates a binding context for the function body
11663 as well as setting up the FUNCTION_DECL in current_function_decl.
11665 For C++, we must first check whether that datum makes any sense.
11666 For example, "class A local_a(1,2);" means that variable local_a
11667 is an aggregate of type A, which should have a constructor
11668 applied to it with the argument list [1, 2].
11670 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11671 or may be a BLOCK if the function has been defined previously
11672 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11673 error_mark_node if the function has never been defined, or
11674 a BLOCK if the function has been defined somewhere. */
11677 start_preparsed_function (tree decl1, tree attrs, int flags)
11679 tree ctype = NULL_TREE;
11682 int doing_friend = 0;
11683 struct cp_binding_level *bl;
11684 tree current_function_parms;
11685 struct c_fileinfo *finfo
11686 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11687 bool honor_interface;
11689 /* Sanity check. */
11690 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11691 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11693 fntype = TREE_TYPE (decl1);
11694 if (TREE_CODE (fntype) == METHOD_TYPE)
11695 ctype = TYPE_METHOD_BASETYPE (fntype);
11697 /* ISO C++ 11.4/5. A friend function defined in a class is in
11698 the (lexical) scope of the class in which it is defined. */
11699 if (!ctype && DECL_FRIEND_P (decl1))
11701 ctype = DECL_FRIEND_CONTEXT (decl1);
11703 /* CTYPE could be null here if we're dealing with a template;
11704 for example, `inline friend float foo()' inside a template
11705 will have no CTYPE set. */
11706 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11712 if (DECL_DECLARED_INLINE_P (decl1)
11713 && lookup_attribute ("noinline", attrs))
11714 warning (0, "inline function %q+D given attribute noinline", decl1);
11716 /* Handle gnu_inline attribute. */
11717 if (GNU_INLINE_P (decl1))
11719 DECL_EXTERNAL (decl1) = 1;
11720 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11721 DECL_INTERFACE_KNOWN (decl1) = 1;
11722 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11725 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11726 /* This is a constructor, we must ensure that any default args
11727 introduced by this definition are propagated to the clones
11728 now. The clones are used directly in overload resolution. */
11729 adjust_clone_args (decl1);
11731 /* Sometimes we don't notice that a function is a static member, and
11732 build a METHOD_TYPE for it. Fix that up now. */
11733 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11734 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11736 revert_static_member_fn (decl1);
11740 /* Set up current_class_type, and enter the scope of the class, if
11743 push_nested_class (ctype);
11744 else if (DECL_STATIC_FUNCTION_P (decl1))
11745 push_nested_class (DECL_CONTEXT (decl1));
11747 /* Now that we have entered the scope of the class, we must restore
11748 the bindings for any template parameters surrounding DECL1, if it
11749 is an inline member template. (Order is important; consider the
11750 case where a template parameter has the same name as a field of
11751 the class.) It is not until after this point that
11752 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11753 if (flags & SF_INCLASS_INLINE)
11754 maybe_begin_member_template_processing (decl1);
11756 /* Effective C++ rule 15. */
11758 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11759 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11760 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11762 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11763 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11764 if (!DECL_INITIAL (decl1))
11765 DECL_INITIAL (decl1) = error_mark_node;
11767 /* This function exists in static storage.
11768 (This does not mean `static' in the C sense!) */
11769 TREE_STATIC (decl1) = 1;
11771 /* We must call push_template_decl after current_class_type is set
11772 up. (If we are processing inline definitions after exiting a
11773 class scope, current_class_type will be NULL_TREE until set above
11774 by push_nested_class.) */
11775 if (processing_template_decl)
11777 /* FIXME: Handle error_mark_node more gracefully. */
11778 tree newdecl1 = push_template_decl (decl1);
11779 if (newdecl1 != error_mark_node)
11783 /* We are now in the scope of the function being defined. */
11784 current_function_decl = decl1;
11786 /* Save the parm names or decls from this function's declarator
11787 where store_parm_decls will find them. */
11788 current_function_parms = DECL_ARGUMENTS (decl1);
11790 /* Make sure the parameter and return types are reasonable. When
11791 you declare a function, these types can be incomplete, but they
11792 must be complete when you define the function. */
11793 check_function_type (decl1, current_function_parms);
11795 /* Build the return declaration for the function. */
11796 restype = TREE_TYPE (fntype);
11797 if (DECL_RESULT (decl1) == NULL_TREE)
11801 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11802 DECL_ARTIFICIAL (resdecl) = 1;
11803 DECL_IGNORED_P (resdecl) = 1;
11804 DECL_RESULT (decl1) = resdecl;
11806 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11809 /* Let the user know we're compiling this function. */
11810 announce_function (decl1);
11812 /* Record the decl so that the function name is defined.
11813 If we already have a decl for this name, and it is a FUNCTION_DECL,
11814 use the old decl. */
11815 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11817 /* A specialization is not used to guide overload resolution. */
11818 if (!DECL_FUNCTION_MEMBER_P (decl1)
11819 && !(DECL_USE_TEMPLATE (decl1) &&
11820 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11822 tree olddecl = pushdecl (decl1);
11824 if (olddecl == error_mark_node)
11825 /* If something went wrong when registering the declaration,
11826 use DECL1; we have to have a FUNCTION_DECL to use when
11827 parsing the body of the function. */
11831 /* Otherwise, OLDDECL is either a previous declaration
11832 of the same function or DECL1 itself. */
11834 if (warn_missing_declarations
11835 && olddecl == decl1
11836 && !DECL_MAIN_P (decl1)
11837 && TREE_PUBLIC (decl1)
11838 && !DECL_DECLARED_INLINE_P (decl1))
11842 /* Check whether DECL1 is in an anonymous
11844 for (context = DECL_CONTEXT (decl1);
11846 context = DECL_CONTEXT (context))
11848 if (TREE_CODE (context) == NAMESPACE_DECL
11849 && DECL_NAME (context) == NULL_TREE)
11853 if (context == NULL)
11854 warning (OPT_Wmissing_declarations,
11855 "no previous declaration for %q+D", decl1);
11863 /* We need to set the DECL_CONTEXT. */
11864 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11865 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11867 fntype = TREE_TYPE (decl1);
11869 /* If #pragma weak applies, mark the decl appropriately now.
11870 The pragma only applies to global functions. Because
11871 determining whether or not the #pragma applies involves
11872 computing the mangled name for the declaration, we cannot
11873 apply the pragma until after we have merged this declaration
11874 with any previous declarations; if the original declaration
11875 has a linkage specification, that specification applies to
11876 the definition as well, and may affect the mangled name. */
11877 if (!DECL_CONTEXT (decl1))
11878 maybe_apply_pragma_weak (decl1);
11881 /* Reset this in case the call to pushdecl changed it. */
11882 current_function_decl = decl1;
11884 gcc_assert (DECL_INITIAL (decl1));
11886 /* This function may already have been parsed, in which case just
11887 return; our caller will skip over the body without parsing. */
11888 if (DECL_INITIAL (decl1) != error_mark_node)
11891 /* Initialize RTL machinery. We cannot do this until
11892 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11893 even when processing a template; this is how we get
11894 CFUN set up, and our per-function variables initialized.
11895 FIXME factor out the non-RTL stuff. */
11896 bl = current_binding_level;
11897 allocate_struct_function (decl1, processing_template_decl);
11899 /* Initialize the language data structures. Whenever we start
11900 a new function, we destroy temporaries in the usual way. */
11901 cfun->language = GGC_CNEW (struct language_function);
11902 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11903 current_binding_level = bl;
11905 /* Even though we're inside a function body, we still don't want to
11906 call expand_expr to calculate the size of a variable-sized array.
11907 We haven't necessarily assigned RTL to all variables yet, so it's
11908 not safe to try to expand expressions involving them. */
11909 cfun->dont_save_pending_sizes_p = 1;
11911 /* Start the statement-tree, start the tree now. */
11912 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11914 /* If we are (erroneously) defining a function that we have already
11915 defined before, wipe out what we knew before. */
11916 if (!DECL_PENDING_INLINE_P (decl1))
11917 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11919 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11921 /* We know that this was set up by `grokclassfn'. We do not
11922 wait until `store_parm_decls', since evil parse errors may
11923 never get us to that point. Here we keep the consistency
11924 between `current_class_type' and `current_class_ptr'. */
11925 tree t = DECL_ARGUMENTS (decl1);
11927 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11928 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11930 cp_function_chain->x_current_class_ref
11931 = cp_build_indirect_ref (t, RO_NULL, tf_warning_or_error);
11932 cp_function_chain->x_current_class_ptr = t;
11934 /* Constructors and destructors need to know whether they're "in
11935 charge" of initializing virtual base classes. */
11936 t = TREE_CHAIN (t);
11937 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11939 current_in_charge_parm = t;
11940 t = TREE_CHAIN (t);
11942 if (DECL_HAS_VTT_PARM_P (decl1))
11944 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11945 current_vtt_parm = t;
11949 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11950 /* Implicitly-defined methods (like the
11951 destructor for a class in which no destructor
11952 is explicitly declared) must not be defined
11953 until their definition is needed. So, we
11954 ignore interface specifications for
11955 compiler-generated functions. */
11956 && !DECL_ARTIFICIAL (decl1));
11958 if (DECL_INTERFACE_KNOWN (decl1))
11960 tree ctx = decl_function_context (decl1);
11962 if (DECL_NOT_REALLY_EXTERN (decl1))
11963 DECL_EXTERNAL (decl1) = 0;
11965 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11966 && TREE_PUBLIC (ctx))
11967 /* This is a function in a local class in an extern inline
11969 comdat_linkage (decl1);
11971 /* If this function belongs to an interface, it is public.
11972 If it belongs to someone else's interface, it is also external.
11973 This only affects inlines and template instantiations. */
11974 else if (!finfo->interface_unknown && honor_interface)
11976 if (DECL_DECLARED_INLINE_P (decl1)
11977 || DECL_TEMPLATE_INSTANTIATION (decl1)
11978 || processing_template_decl)
11980 DECL_EXTERNAL (decl1)
11981 = (finfo->interface_only
11982 || (DECL_DECLARED_INLINE_P (decl1)
11983 && ! flag_implement_inlines
11984 && !DECL_VINDEX (decl1)));
11986 /* For WIN32 we also want to put these in linkonce sections. */
11987 maybe_make_one_only (decl1);
11990 DECL_EXTERNAL (decl1) = 0;
11991 DECL_INTERFACE_KNOWN (decl1) = 1;
11992 /* If this function is in an interface implemented in this file,
11993 make sure that the back end knows to emit this function
11995 if (!DECL_EXTERNAL (decl1))
11996 mark_needed (decl1);
11998 else if (finfo->interface_unknown && finfo->interface_only
11999 && honor_interface)
12001 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
12002 interface, we will have both finfo->interface_unknown and
12003 finfo->interface_only set. In that case, we don't want to
12004 use the normal heuristics because someone will supply a
12005 #pragma implementation elsewhere, and deducing it here would
12006 produce a conflict. */
12007 comdat_linkage (decl1);
12008 DECL_EXTERNAL (decl1) = 0;
12009 DECL_INTERFACE_KNOWN (decl1) = 1;
12010 DECL_DEFER_OUTPUT (decl1) = 1;
12014 /* This is a definition, not a reference.
12015 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12016 if (!GNU_INLINE_P (decl1))
12017 DECL_EXTERNAL (decl1) = 0;
12019 if ((DECL_DECLARED_INLINE_P (decl1)
12020 || DECL_TEMPLATE_INSTANTIATION (decl1))
12021 && ! DECL_INTERFACE_KNOWN (decl1)
12022 /* Don't try to defer nested functions for now. */
12023 && ! decl_function_context (decl1))
12024 DECL_DEFER_OUTPUT (decl1) = 1;
12026 DECL_INTERFACE_KNOWN (decl1) = 1;
12029 /* Determine the ELF visibility attribute for the function. We must not
12030 do this before calling "pushdecl", as we must allow "duplicate_decls"
12031 to merge any attributes appropriately. We also need to wait until
12033 if (!DECL_CLONED_FUNCTION_P (decl1))
12034 determine_visibility (decl1);
12036 begin_scope (sk_function_parms, decl1);
12040 if (DECL_DESTRUCTOR_P (decl1)
12041 || (DECL_CONSTRUCTOR_P (decl1)
12042 && targetm.cxx.cdtor_returns_this ()))
12044 cdtor_label = build_decl (input_location,
12045 LABEL_DECL, NULL_TREE, NULL_TREE);
12046 DECL_CONTEXT (cdtor_label) = current_function_decl;
12049 start_fname_decls ();
12051 store_parm_decls (current_function_parms);
12055 /* Like start_preparsed_function, except that instead of a
12056 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12058 Returns 1 on success. If the DECLARATOR is not suitable for a function
12059 (it defines a datum instead), we return 0, which tells
12060 yyparse to report a parse error. */
12063 start_function (cp_decl_specifier_seq *declspecs,
12064 const cp_declarator *declarator,
12069 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12070 if (decl1 == error_mark_node)
12072 /* If the declarator is not suitable for a function definition,
12073 cause a syntax error. */
12074 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12076 error ("invalid function declaration");
12080 if (DECL_MAIN_P (decl1))
12081 /* main must return int. grokfndecl should have corrected it
12082 (and issued a diagnostic) if the user got it wrong. */
12083 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12084 integer_type_node));
12086 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12091 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12095 use_eh_spec_block (tree fn)
12097 return (flag_exceptions && flag_enforce_eh_specs
12098 && !processing_template_decl
12099 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
12100 /* We insert the EH_SPEC_BLOCK only in the original
12101 function; then, it is copied automatically to the
12103 && !DECL_CLONED_FUNCTION_P (fn)
12104 /* Implicitly-generated constructors and destructors have
12105 exception specifications. However, those specifications
12106 are the union of the possible exceptions specified by the
12107 constructors/destructors for bases and members, so no
12108 unallowed exception will ever reach this function. By
12109 not creating the EH_SPEC_BLOCK we save a little memory,
12110 and we avoid spurious warnings about unreachable
12112 && !DECL_ARTIFICIAL (fn));
12115 /* Store the parameter declarations into the current function declaration.
12116 This is called after parsing the parameter declarations, before
12117 digesting the body of the function.
12119 Also install to binding contour return value identifier, if any. */
12122 store_parm_decls (tree current_function_parms)
12124 tree fndecl = current_function_decl;
12127 /* This is a chain of any other decls that came in among the parm
12128 declarations. If a parm is declared with enum {foo, bar} x;
12129 then CONST_DECLs for foo and bar are put here. */
12130 tree nonparms = NULL_TREE;
12132 if (current_function_parms)
12134 /* This case is when the function was defined with an ANSI prototype.
12135 The parms already have decls, so we need not do anything here
12136 except record them as in effect
12137 and complain if any redundant old-style parm decls were written. */
12139 tree specparms = current_function_parms;
12142 /* Must clear this because it might contain TYPE_DECLs declared
12144 current_binding_level->names = NULL;
12146 /* If we're doing semantic analysis, then we'll call pushdecl
12147 for each of these. We must do them in reverse order so that
12148 they end in the correct forward order. */
12149 specparms = nreverse (specparms);
12151 for (parm = specparms; parm; parm = next)
12153 next = TREE_CHAIN (parm);
12154 if (TREE_CODE (parm) == PARM_DECL)
12156 if (DECL_NAME (parm) == NULL_TREE
12157 || TREE_CODE (parm) != VOID_TYPE)
12160 error ("parameter %qD declared void", parm);
12164 /* If we find an enum constant or a type tag,
12165 put it aside for the moment. */
12166 TREE_CHAIN (parm) = NULL_TREE;
12167 nonparms = chainon (nonparms, parm);
12171 /* Get the decls in their original chain order and record in the
12172 function. This is all and only the PARM_DECLs that were
12173 pushed into scope by the loop above. */
12174 DECL_ARGUMENTS (fndecl) = getdecls ();
12177 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12179 /* Now store the final chain of decls for the arguments
12180 as the decl-chain of the current lexical scope.
12181 Put the enumerators in as well, at the front so that
12182 DECL_ARGUMENTS is not modified. */
12183 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12185 if (use_eh_spec_block (current_function_decl))
12186 current_eh_spec_block = begin_eh_spec_block ();
12190 /* We have finished doing semantic analysis on DECL, but have not yet
12191 generated RTL for its body. Save away our current state, so that
12192 when we want to generate RTL later we know what to do. */
12195 save_function_data (tree decl)
12197 struct language_function *f;
12199 /* Save the language-specific per-function data so that we can
12200 get it back when we really expand this function. */
12201 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12204 f = GGC_NEW (struct language_function);
12205 memcpy (f, cp_function_chain, sizeof (struct language_function));
12206 DECL_SAVED_FUNCTION_DATA (decl) = f;
12208 /* Clear out the bits we don't need. */
12209 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12210 f->bindings = NULL;
12211 f->x_local_names = NULL;
12215 /* Set the return value of the constructor (if present). */
12218 finish_constructor_body (void)
12223 if (targetm.cxx.cdtor_returns_this ()
12224 && (! TYPE_FOR_JAVA (current_class_type)))
12226 /* Any return from a constructor will end up here. */
12227 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12229 val = DECL_ARGUMENTS (current_function_decl);
12230 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12231 DECL_RESULT (current_function_decl), val);
12232 /* Return the address of the object. */
12233 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12234 add_stmt (exprstmt);
12238 /* Do all the processing for the beginning of a destructor; set up the
12239 vtable pointers and cleanups for bases and members. */
12242 begin_destructor_body (void)
12244 tree compound_stmt;
12246 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12247 issued an error message. We still want to try to process the
12248 body of the function, but initialize_vtbl_ptrs will crash if
12249 TYPE_BINFO is NULL. */
12250 if (COMPLETE_TYPE_P (current_class_type))
12252 compound_stmt = begin_compound_stmt (0);
12253 /* Make all virtual function table pointers in non-virtual base
12254 classes point to CURRENT_CLASS_TYPE's virtual function
12256 initialize_vtbl_ptrs (current_class_ptr);
12257 finish_compound_stmt (compound_stmt);
12259 /* And insert cleanups for our bases and members so that they
12260 will be properly destroyed if we throw. */
12261 push_base_cleanups ();
12265 /* At the end of every destructor we generate code to delete the object if
12266 necessary. Do that now. */
12269 finish_destructor_body (void)
12273 /* Any return from a destructor will end up here; that way all base
12274 and member cleanups will be run when the function returns. */
12275 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12277 /* In a virtual destructor, we must call delete. */
12278 if (DECL_VIRTUAL_P (current_function_decl))
12281 tree virtual_size = cxx_sizeof (current_class_type);
12285 At the point of definition of a virtual destructor (including
12286 an implicit definition), non-placement operator delete shall
12287 be looked up in the scope of the destructor's class and if
12288 found shall be accessible and unambiguous. */
12289 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12291 /*global_p=*/false,
12292 /*placement=*/NULL_TREE,
12293 /*alloc_fn=*/NULL_TREE);
12295 if_stmt = begin_if_stmt ();
12296 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12297 current_in_charge_parm,
12300 finish_expr_stmt (exprstmt);
12301 finish_then_clause (if_stmt);
12302 finish_if_stmt (if_stmt);
12305 if (targetm.cxx.cdtor_returns_this ())
12309 val = DECL_ARGUMENTS (current_function_decl);
12310 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12311 DECL_RESULT (current_function_decl), val);
12312 /* Return the address of the object. */
12313 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12314 add_stmt (exprstmt);
12318 /* Do the necessary processing for the beginning of a function body, which
12319 in this case includes member-initializers, but not the catch clauses of
12320 a function-try-block. Currently, this means opening a binding level
12321 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12324 begin_function_body (void)
12328 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12331 if (processing_template_decl)
12332 /* Do nothing now. */;
12334 /* Always keep the BLOCK node associated with the outermost pair of
12335 curly braces of a function. These are needed for correct
12336 operation of dwarfout.c. */
12337 keep_next_level (true);
12339 stmt = begin_compound_stmt (BCS_FN_BODY);
12341 if (processing_template_decl)
12342 /* Do nothing now. */;
12343 else if (DECL_DESTRUCTOR_P (current_function_decl))
12344 begin_destructor_body ();
12349 /* Do the processing for the end of a function body. Currently, this means
12350 closing out the cleanups for fully-constructed bases and members, and in
12351 the case of the destructor, deleting the object if desired. Again, this
12352 is only meaningful for [cd]tors, since they are the only functions where
12353 there is a significant distinction between the main body and any
12354 function catch clauses. Handling, say, main() return semantics here
12355 would be wrong, as flowing off the end of a function catch clause for
12356 main() would also need to return 0. */
12359 finish_function_body (tree compstmt)
12361 if (compstmt == NULL_TREE)
12364 /* Close the block. */
12365 finish_compound_stmt (compstmt);
12367 if (processing_template_decl)
12368 /* Do nothing now. */;
12369 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12370 finish_constructor_body ();
12371 else if (DECL_DESTRUCTOR_P (current_function_decl))
12372 finish_destructor_body ();
12375 /* Given a function, returns the BLOCK corresponding to the outermost level
12376 of curly braces, skipping the artificial block created for constructor
12380 outer_curly_brace_block (tree fndecl)
12382 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12383 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12384 /* Skip the artificial function body block. */
12385 block = BLOCK_SUBBLOCKS (block);
12389 /* Finish up a function declaration and compile that function
12390 all the way to assembler language output. The free the storage
12391 for the function definition.
12393 FLAGS is a bitwise or of the following values:
12395 We just finished processing the body of an in-class inline
12396 function definition. (This processing will have taken place
12397 after the class definition is complete.) */
12400 finish_function (int flags)
12402 tree fndecl = current_function_decl;
12403 tree fntype, ctype = NULL_TREE;
12404 int inclass_inline = (flags & 2) != 0;
12407 /* When we get some parse errors, we can end up without a
12408 current_function_decl, so cope. */
12409 if (fndecl == NULL_TREE)
12410 return error_mark_node;
12412 gcc_assert (!defer_mark_used_calls);
12413 defer_mark_used_calls = true;
12415 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12416 && DECL_VIRTUAL_P (fndecl)
12417 && !processing_template_decl)
12419 tree fnclass = DECL_CONTEXT (fndecl);
12420 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12421 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12424 nested = function_depth > 1;
12425 fntype = TREE_TYPE (fndecl);
12427 /* TREE_READONLY (fndecl) = 1;
12428 This caused &foo to be of type ptr-to-const-function
12429 which then got a warning when stored in a ptr-to-function variable. */
12431 gcc_assert (building_stmt_tree ());
12432 /* The current function is being defined, so its DECL_INITIAL should
12433 be set, and unless there's a multiple definition, it should be
12434 error_mark_node. */
12435 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12437 /* For a cloned function, we've already got all the code we need;
12438 there's no need to add any extra bits. */
12439 if (!DECL_CLONED_FUNCTION_P (fndecl))
12441 if (DECL_MAIN_P (current_function_decl))
12445 /* Make it so that `main' always returns 0 by default (or
12448 stmt = finish_return_stmt (integer_one_node);
12450 stmt = finish_return_stmt (integer_zero_node);
12452 /* Hack. We don't want the middle-end to warn that this
12453 return is unreachable, so put the statement on the
12456 location_t linezero = linemap_line_start (line_table, 0, 1);
12457 SET_EXPR_LOCATION (stmt, linezero);
12461 if (use_eh_spec_block (current_function_decl))
12462 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12463 (TREE_TYPE (current_function_decl)),
12464 current_eh_spec_block);
12467 /* If we're saving up tree structure, tie off the function now. */
12468 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12470 finish_fname_decls ();
12472 /* If this function can't throw any exceptions, remember that. */
12473 if (!processing_template_decl
12474 && !cp_function_chain->can_throw
12475 && !flag_non_call_exceptions
12476 && !DECL_REPLACEABLE_P (fndecl))
12477 TREE_NOTHROW (fndecl) = 1;
12479 /* This must come after expand_function_end because cleanups might
12480 have declarations (from inline functions) that need to go into
12481 this function's blocks. */
12483 /* If the current binding level isn't the outermost binding level
12484 for this function, either there is a bug, or we have experienced
12485 syntax errors and the statement tree is malformed. */
12486 if (current_binding_level->kind != sk_function_parms)
12488 /* Make sure we have already experienced errors. */
12489 gcc_assert (errorcount);
12491 /* Throw away the broken statement tree and extra binding
12493 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12495 while (current_binding_level->kind != sk_function_parms)
12497 if (current_binding_level->kind == sk_class)
12498 pop_nested_class ();
12500 poplevel (0, 0, 0);
12503 poplevel (1, 0, 1);
12505 /* Statements should always be full-expressions at the outermost set
12506 of curly braces for a function. */
12507 gcc_assert (stmts_are_full_exprs_p ());
12509 /* Set up the named return value optimization, if we can. Candidate
12510 variables are selected in check_return_expr. */
12511 if (current_function_return_value)
12513 tree r = current_function_return_value;
12516 if (r != error_mark_node
12517 /* This is only worth doing for fns that return in memory--and
12518 simpler, since we don't have to worry about promoted modes. */
12519 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12520 /* Only allow this for variables declared in the outer scope of
12521 the function so we know that their lifetime always ends with a
12522 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12523 we were to do this optimization in tree-ssa. */
12524 && (outer = outer_curly_brace_block (fndecl))
12525 && chain_member (r, BLOCK_VARS (outer)))
12526 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12528 current_function_return_value = NULL_TREE;
12531 /* Remember that we were in class scope. */
12532 if (current_class_name)
12533 ctype = current_class_type;
12535 /* Must mark the RESULT_DECL as being in this function. */
12536 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12538 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12539 to the FUNCTION_DECL node itself. */
12540 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12542 /* Save away current state, if appropriate. */
12543 if (!processing_template_decl)
12544 save_function_data (fndecl);
12546 /* Complain if there's just no return statement. */
12547 if (warn_return_type
12548 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12549 && !dependent_type_p (TREE_TYPE (fntype))
12550 && !current_function_returns_value && !current_function_returns_null
12551 /* Don't complain if we abort or throw. */
12552 && !current_function_returns_abnormally
12553 /* Don't complain if we are declared noreturn. */
12554 && !TREE_THIS_VOLATILE (fndecl)
12555 && !DECL_NAME (DECL_RESULT (fndecl))
12556 && !TREE_NO_WARNING (fndecl)
12557 /* Structor return values (if any) are set by the compiler. */
12558 && !DECL_CONSTRUCTOR_P (fndecl)
12559 && !DECL_DESTRUCTOR_P (fndecl))
12561 warning (OPT_Wreturn_type,
12562 "no return statement in function returning non-void");
12563 TREE_NO_WARNING (fndecl) = 1;
12566 /* Store the end of the function, so that we get good line number
12567 info for the epilogue. */
12568 cfun->function_end_locus = input_location;
12570 /* Genericize before inlining. */
12571 if (!processing_template_decl)
12573 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12574 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE, fndecl);
12575 cp_genericize (fndecl);
12576 /* Clear out the bits we don't need. */
12577 f->x_current_class_ptr = NULL;
12578 f->x_current_class_ref = NULL;
12579 f->x_eh_spec_block = NULL;
12580 f->x_in_charge_parm = NULL;
12581 f->x_vtt_parm = NULL;
12582 f->x_return_value = NULL;
12583 f->bindings = NULL;
12584 f->extern_decl_map = NULL;
12586 /* Clear out the bits we don't need. */
12587 local_names = NULL;
12589 /* We're leaving the context of this function, so zap cfun. It's still in
12590 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12592 current_function_decl = NULL;
12594 /* If this is an in-class inline definition, we may have to pop the
12595 bindings for the template parameters that we added in
12596 maybe_begin_member_template_processing when start_function was
12598 if (inclass_inline)
12599 maybe_end_member_template_processing ();
12601 /* Leave the scope of the class. */
12603 pop_nested_class ();
12609 /* Let the error reporting routines know that we're outside a
12610 function. For a nested function, this value is used in
12611 cxx_pop_function_context and then reset via pop_function_context. */
12612 current_function_decl = NULL_TREE;
12614 defer_mark_used_calls = false;
12615 if (deferred_mark_used_calls)
12620 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12622 VEC_free (tree, gc, deferred_mark_used_calls);
12628 /* Create the FUNCTION_DECL for a function definition.
12629 DECLSPECS and DECLARATOR are the parts of the declaration;
12630 they describe the return type and the name of the function,
12631 but twisted together in a fashion that parallels the syntax of C.
12633 This function creates a binding context for the function body
12634 as well as setting up the FUNCTION_DECL in current_function_decl.
12636 Returns a FUNCTION_DECL on success.
12638 If the DECLARATOR is not suitable for a function (it defines a datum
12639 instead), we return 0, which tells yyparse to report a parse error.
12641 May return void_type_node indicating that this method is actually
12642 a friend. See grokfield for more details.
12644 Came here with a `.pushlevel' .
12646 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12647 CHANGES TO CODE IN `grokfield'. */
12650 grokmethod (cp_decl_specifier_seq *declspecs,
12651 const cp_declarator *declarator, tree attrlist)
12653 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12656 if (fndecl == error_mark_node)
12657 return error_mark_node;
12659 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12661 error ("invalid member function declaration");
12662 return error_mark_node;
12666 cplus_decl_attributes (&fndecl, attrlist, 0);
12668 /* Pass friends other than inline friend functions back. */
12669 if (fndecl == void_type_node)
12672 if (DECL_IN_AGGR_P (fndecl))
12674 if (DECL_CONTEXT (fndecl)
12675 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12676 error ("%qD is already defined in class %qT", fndecl,
12677 DECL_CONTEXT (fndecl));
12678 return error_mark_node;
12681 check_template_shadow (fndecl);
12683 DECL_DECLARED_INLINE_P (fndecl) = 1;
12684 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12686 /* We process method specializations in finish_struct_1. */
12687 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12689 fndecl = push_template_decl (fndecl);
12690 if (fndecl == error_mark_node)
12694 if (! DECL_FRIEND_P (fndecl))
12696 if (TREE_CHAIN (fndecl))
12698 fndecl = copy_node (fndecl);
12699 TREE_CHAIN (fndecl) = NULL_TREE;
12703 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12705 DECL_IN_AGGR_P (fndecl) = 1;
12710 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12711 we can lay it out later, when and if its type becomes complete. */
12714 maybe_register_incomplete_var (tree var)
12716 gcc_assert (TREE_CODE (var) == VAR_DECL);
12718 /* Keep track of variables with incomplete types. */
12719 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12720 && DECL_EXTERNAL (var))
12722 tree inner_type = TREE_TYPE (var);
12724 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12725 inner_type = TREE_TYPE (inner_type);
12726 inner_type = TYPE_MAIN_VARIANT (inner_type);
12728 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12729 /* RTTI TD entries are created while defining the type_info. */
12730 || (TYPE_LANG_SPECIFIC (inner_type)
12731 && TYPE_BEING_DEFINED (inner_type)))
12732 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12736 /* Called when a class type (given by TYPE) is defined. If there are
12737 any existing VAR_DECLs whose type has been completed by this
12738 declaration, update them now. */
12741 complete_vars (tree type)
12743 tree *list = &incomplete_vars;
12745 gcc_assert (CLASS_TYPE_P (type));
12748 if (same_type_p (type, TREE_PURPOSE (*list)))
12750 tree var = TREE_VALUE (*list);
12751 tree type = TREE_TYPE (var);
12752 /* Complete the type of the variable. The VAR_DECL itself
12753 will be laid out in expand_expr. */
12754 complete_type (type);
12755 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12756 /* Remove this entry from the list. */
12757 *list = TREE_CHAIN (*list);
12760 list = &TREE_CHAIN (*list);
12763 /* Check for pending declarations which may have abstract type. */
12764 complete_type_check_abstract (type);
12767 /* If DECL is of a type which needs a cleanup, build and return an
12768 expression to perform that cleanup here. Return NULL_TREE if no
12769 cleanup need be done. */
12772 cxx_maybe_build_cleanup (tree decl)
12778 /* Assume no cleanup is required. */
12779 cleanup = NULL_TREE;
12781 if (error_operand_p (decl))
12784 /* Handle "__attribute__((cleanup))". We run the cleanup function
12785 before the destructor since the destructor is what actually
12786 terminates the lifetime of the object. */
12787 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12794 /* Get the name specified by the user for the cleanup function. */
12795 id = TREE_VALUE (TREE_VALUE (attr));
12796 /* Look up the name to find the cleanup function to call. It is
12797 important to use lookup_name here because that is what is
12798 used in c-common.c:handle_cleanup_attribute when performing
12799 initial checks on the attribute. Note that those checks
12800 include ensuring that the function found is not an overloaded
12801 function, or an object with an overloaded call operator,
12802 etc.; we can rely on the fact that the function found is an
12803 ordinary FUNCTION_DECL. */
12804 fn = lookup_name (id);
12805 arg = build_address (decl);
12807 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12809 tf_warning_or_error);
12811 /* Handle ordinary C++ destructors. */
12812 type = TREE_TYPE (decl);
12813 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12815 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12816 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12817 && CLASSTYPE_VBASECLASSES (type));
12821 if (TREE_CODE (type) == ARRAY_TYPE)
12824 addr = build_address (decl);
12826 /* Optimize for space over speed here. */
12827 if (!has_vbases || flag_expensive_optimizations)
12828 flags |= LOOKUP_NONVIRTUAL;
12830 call = build_delete (TREE_TYPE (addr), addr,
12831 sfk_complete_destructor, flags, 0);
12833 cleanup = build_compound_expr (input_location, cleanup, call);
12841 /* When a stmt has been parsed, this function is called. */
12848 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
12849 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
12850 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
12853 static_fn_type (tree memfntype)
12859 if (TYPE_PTRMEMFUNC_P (memfntype))
12860 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
12861 if (POINTER_TYPE_P (memfntype)
12862 || TREE_CODE (memfntype) == FUNCTION_DECL)
12863 memfntype = TREE_TYPE (memfntype);
12864 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
12866 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
12867 args = TYPE_ARG_TYPES (memfntype);
12868 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
12869 quals = cp_type_quals (TREE_TYPE (TREE_VALUE (args)));
12870 fntype = build_qualified_type (fntype, quals);
12871 fntype = (cp_build_type_attribute_variant
12872 (fntype, TYPE_ATTRIBUTES (memfntype)));
12873 fntype = (build_exception_variant
12874 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
12878 /* DECL was originally constructed as a non-static member function,
12879 but turned out to be static. Update it accordingly. */
12882 revert_static_member_fn (tree decl)
12884 TREE_TYPE (decl) = static_fn_type (decl);
12886 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
12887 error ("static member function %q#D declared with type qualifiers", decl);
12889 if (DECL_ARGUMENTS (decl))
12890 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12891 DECL_STATIC_FUNCTION_P (decl) = 1;
12894 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12895 one of the language-independent trees. */
12897 enum cp_tree_node_structure_enum
12898 cp_tree_node_structure (union lang_tree_node * t)
12900 switch (TREE_CODE (&t->generic))
12902 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12903 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12904 case OVERLOAD: return TS_CP_OVERLOAD;
12905 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12906 case PTRMEM_CST: return TS_CP_PTRMEM;
12907 case BASELINK: return TS_CP_BASELINK;
12908 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12909 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12910 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12911 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
12912 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
12913 default: return TS_CP_GENERIC;
12917 /* Build the void_list_node (void_type_node having been created). */
12919 build_void_list_node (void)
12921 tree t = build_tree_list (NULL_TREE, void_type_node);
12926 cp_missing_noreturn_ok_p (tree decl)
12928 /* A missing noreturn is ok for the `main' function. */
12929 return DECL_MAIN_P (decl);
12932 /* Return the COMDAT group into which DECL should be placed. */
12935 cxx_comdat_group (tree decl)
12939 /* Virtual tables, construction virtual tables, and virtual table
12940 tables all go in a single COMDAT group, named after the primary
12942 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12943 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12944 /* For all other DECLs, the COMDAT group is the mangled name of the
12945 declaration itself. */
12948 while (DECL_THUNK_P (decl))
12950 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12951 into the same section as the target function. In that case
12952 we must return target's name. */
12953 tree target = THUNK_TARGET (decl);
12954 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12955 && DECL_SECTION_NAME (target) != NULL
12956 && DECL_ONE_ONLY (target))
12961 name = DECL_ASSEMBLER_NAME (decl);
12967 #include "gt-cp-decl.h"