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, "shadowing %s function %q#D",
1184 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1186 /* Discard the old built-in function. */
1189 /* If the built-in is not ansi, then programs can override
1190 it even globally without an error. */
1191 else if (! DECL_BUILT_IN (olddecl))
1192 warning (0, "library function %q#D redeclared as non-function %q#D",
1196 error ("declaration of %q#D", newdecl);
1197 error ("conflicts with built-in declaration %q#D",
1202 else if (!types_match)
1204 /* Avoid warnings redeclaring built-ins which have not been
1205 explicitly declared. */
1206 if (DECL_ANTICIPATED (olddecl))
1208 /* Deal with fileptr_type_node. FILE type is not known
1209 at the time we create the builtins. */
1212 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1213 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1215 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1218 else if (TREE_VALUE (t2) == fileptr_type_node)
1220 tree t = TREE_VALUE (t1);
1222 if (TREE_CODE (t) == POINTER_TYPE
1223 && TYPE_NAME (TREE_TYPE (t))
1224 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1225 == get_identifier ("FILE")
1226 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1228 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1230 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1231 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1232 types_match = decls_match (newdecl, olddecl);
1234 return duplicate_decls (newdecl, olddecl,
1236 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1239 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1242 else if ((DECL_EXTERN_C_P (newdecl)
1243 && DECL_EXTERN_C_P (olddecl))
1244 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1245 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1247 /* A near match; override the builtin. */
1249 if (TREE_PUBLIC (newdecl))
1251 warning (0, "new declaration %q#D", newdecl);
1252 warning (0, "ambiguates built-in declaration %q#D",
1256 warning (OPT_Wshadow, "shadowing %s function %q#D",
1257 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1261 /* Discard the old built-in function. */
1264 /* Replace the old RTL to avoid problems with inlining. */
1265 COPY_DECL_RTL (newdecl, olddecl);
1267 /* Even if the types match, prefer the new declarations type for
1268 built-ins which have not been explicitly declared, for
1269 exception lists, etc... */
1270 else if (DECL_ANTICIPATED (olddecl))
1272 tree type = TREE_TYPE (newdecl);
1273 tree attribs = (*targetm.merge_type_attributes)
1274 (TREE_TYPE (olddecl), type);
1276 type = cp_build_type_attribute_variant (type, attribs);
1277 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1280 /* If a function is explicitly declared "throw ()", propagate that to
1281 the corresponding builtin. */
1282 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1283 && DECL_ANTICIPATED (olddecl)
1284 && TREE_NOTHROW (newdecl)
1285 && !TREE_NOTHROW (olddecl)
1286 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1287 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1289 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1291 /* Whether or not the builtin can throw exceptions has no
1292 bearing on this declarator. */
1293 TREE_NOTHROW (olddecl) = 0;
1295 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1297 /* If a builtin function is redeclared as `static', merge
1298 the declarations, but make the original one static. */
1299 DECL_THIS_STATIC (olddecl) = 1;
1300 TREE_PUBLIC (olddecl) = 0;
1302 /* Make the old declaration consistent with the new one so
1303 that all remnants of the builtin-ness of this function
1304 will be banished. */
1305 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1306 COPY_DECL_RTL (newdecl, olddecl);
1309 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1311 /* C++ Standard, 3.3, clause 4:
1312 "[Note: a namespace name or a class template name must be unique
1313 in its declarative region (7.3.2, clause 14). ]" */
1314 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1315 && TREE_CODE (newdecl) != NAMESPACE_DECL
1316 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1317 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1318 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1319 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1321 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1322 && TREE_CODE (newdecl) != TYPE_DECL)
1323 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1324 && TREE_CODE (olddecl) != TYPE_DECL))
1326 /* We do nothing special here, because C++ does such nasty
1327 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1328 get shadowed, and know that if we need to find a TYPE_DECL
1329 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1330 slot of the identifier. */
1334 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1335 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1336 || (TREE_CODE (olddecl) == FUNCTION_DECL
1337 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1341 error ("%q#D redeclared as different kind of symbol", newdecl);
1342 if (TREE_CODE (olddecl) == TREE_LIST)
1343 olddecl = TREE_VALUE (olddecl);
1344 error ("previous declaration of %q+#D", olddecl);
1346 return error_mark_node;
1348 else if (!types_match)
1350 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1351 /* These are certainly not duplicate declarations; they're
1352 from different scopes. */
1355 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1357 /* The name of a class template may not be declared to refer to
1358 any other template, class, function, object, namespace, value,
1359 or type in the same scope. */
1360 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1361 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1363 error ("declaration of template %q#D", newdecl);
1364 error ("conflicts with previous declaration %q+#D", olddecl);
1366 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1367 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1368 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1369 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1370 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1371 DECL_TEMPLATE_PARMS (olddecl))
1372 /* Template functions can be disambiguated by
1374 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1375 TREE_TYPE (TREE_TYPE (olddecl))))
1377 error ("new declaration %q#D", newdecl);
1378 error ("ambiguates old declaration %q+#D", olddecl);
1382 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1384 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1386 error ("declaration of C function %q#D conflicts with",
1388 error ("previous declaration %q+#D here", olddecl);
1390 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1391 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1393 error ("new declaration %q#D", newdecl);
1394 error ("ambiguates old declaration %q+#D", olddecl);
1395 return error_mark_node;
1402 error ("conflicting declaration %q#D", newdecl);
1403 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1404 return error_mark_node;
1407 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1408 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1409 && (!DECL_TEMPLATE_INFO (newdecl)
1410 || (DECL_TI_TEMPLATE (newdecl)
1411 != DECL_TI_TEMPLATE (olddecl))))
1412 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1413 && (!DECL_TEMPLATE_INFO (olddecl)
1414 || (DECL_TI_TEMPLATE (olddecl)
1415 != DECL_TI_TEMPLATE (newdecl))))))
1416 /* It's OK to have a template specialization and a non-template
1417 with the same type, or to have specializations of two
1418 different templates with the same type. Note that if one is a
1419 specialization, and the other is an instantiation of the same
1420 template, that we do not exit at this point. That situation
1421 can occur if we instantiate a template class, and then
1422 specialize one of its methods. This situation is valid, but
1423 the declarations must be merged in the usual way. */
1425 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1426 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1427 && !DECL_USE_TEMPLATE (newdecl))
1428 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1429 && !DECL_USE_TEMPLATE (olddecl))))
1430 /* One of the declarations is a template instantiation, and the
1431 other is not a template at all. That's OK. */
1433 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1435 /* In [namespace.alias] we have:
1437 In a declarative region, a namespace-alias-definition can be
1438 used to redefine a namespace-alias declared in that declarative
1439 region to refer only to the namespace to which it already
1442 Therefore, if we encounter a second alias directive for the same
1443 alias, we can just ignore the second directive. */
1444 if (DECL_NAMESPACE_ALIAS (newdecl)
1445 && (DECL_NAMESPACE_ALIAS (newdecl)
1446 == DECL_NAMESPACE_ALIAS (olddecl)))
1448 /* [namespace.alias]
1450 A namespace-name or namespace-alias shall not be declared as
1451 the name of any other entity in the same declarative region.
1452 A namespace-name defined at global scope shall not be
1453 declared as the name of any other entity in any global scope
1455 error ("declaration of namespace %qD conflicts with", newdecl);
1456 error ("previous declaration of namespace %q+D here", olddecl);
1457 return error_mark_node;
1461 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1464 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1465 if (DECL_NAME (olddecl) != NULL_TREE)
1466 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1467 ? "%q+#D previously defined here"
1468 : "%q+#D previously declared here", olddecl);
1469 return error_mark_node;
1471 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1472 && DECL_INITIAL (olddecl) != NULL_TREE
1473 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1474 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1476 /* Prototype decl follows defn w/o prototype. */
1477 warning_at (input_location, 0, "prototype for %q+#D", newdecl);
1478 warning_at (DECL_SOURCE_LOCATION (olddecl), 0,
1479 "follows non-prototype definition here");
1481 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1482 || TREE_CODE (olddecl) == VAR_DECL)
1483 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1486 If two declarations of the same function or object
1487 specify different linkage-specifications ..., the program
1488 is ill-formed.... Except for functions with C++ linkage,
1489 a function declaration without a linkage specification
1490 shall not precede the first linkage specification for
1491 that function. A function can be declared without a
1492 linkage specification after an explicit linkage
1493 specification has been seen; the linkage explicitly
1494 specified in the earlier declaration is not affected by
1495 such a function declaration.
1497 DR 563 raises the question why the restrictions on
1498 functions should not also apply to objects. Older
1499 versions of G++ silently ignore the linkage-specification
1507 which is clearly wrong. Therefore, we now treat objects
1509 if (current_lang_depth () == 0)
1511 /* There is no explicit linkage-specification, so we use
1512 the linkage from the previous declaration. */
1513 if (!DECL_LANG_SPECIFIC (newdecl))
1514 retrofit_lang_decl (newdecl);
1515 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1519 error ("previous declaration of %q+#D with %qL linkage",
1520 olddecl, DECL_LANGUAGE (olddecl));
1521 error ("conflicts with new declaration with %qL linkage",
1522 DECL_LANGUAGE (newdecl));
1526 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1528 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1530 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1531 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1534 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1535 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1537 for (; t1 && t1 != void_list_node;
1538 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1539 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1541 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1544 permerror (input_location, "default argument given for parameter %d of %q#D",
1546 permerror (input_location, "after previous specification in %q+#D", olddecl);
1550 error ("default argument given for parameter %d of %q#D",
1552 error ("after previous specification in %q+#D",
1559 /* Do not merge an implicit typedef with an explicit one. In:
1563 typedef class A A __attribute__ ((foo));
1565 the attribute should apply only to the typedef. */
1566 if (TREE_CODE (olddecl) == TYPE_DECL
1567 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1568 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1571 /* If new decl is `static' and an `extern' was seen previously,
1573 warn_extern_redeclared_static (newdecl, olddecl);
1575 /* We have committed to returning 1 at this point. */
1576 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1578 /* Now that functions must hold information normally held
1579 by field decls, there is extra work to do so that
1580 declaration information does not get destroyed during
1582 if (DECL_VINDEX (olddecl))
1583 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1584 if (DECL_CONTEXT (olddecl))
1585 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1586 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1587 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1588 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1589 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1590 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1591 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1592 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1593 SET_OVERLOADED_OPERATOR_CODE
1594 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1595 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1597 /* Optionally warn about more than one declaration for the same
1598 name, but don't warn about a function declaration followed by a
1600 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1601 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1602 /* Don't warn about extern decl followed by definition. */
1603 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1604 /* Don't warn about friends, let add_friend take care of it. */
1605 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1607 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1608 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1611 if (DECL_DELETED_FN (newdecl))
1613 error ("deleted definition of %qD", newdecl);
1614 error ("after previous declaration %q+D", olddecl);
1618 /* Deal with C++: must preserve virtual function table size. */
1619 if (TREE_CODE (olddecl) == TYPE_DECL)
1621 tree newtype = TREE_TYPE (newdecl);
1622 tree oldtype = TREE_TYPE (olddecl);
1624 if (newtype != error_mark_node && oldtype != error_mark_node
1625 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1626 CLASSTYPE_FRIEND_CLASSES (newtype)
1627 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1629 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1632 /* Copy all the DECL_... slots specified in the new decl
1633 except for any that we copy here from the old type. */
1634 DECL_ATTRIBUTES (newdecl)
1635 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1637 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1641 old_result = DECL_TEMPLATE_RESULT (olddecl);
1642 new_result = DECL_TEMPLATE_RESULT (newdecl);
1643 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1644 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1645 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1646 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1648 DECL_ATTRIBUTES (old_result)
1649 = (*targetm.merge_decl_attributes) (old_result, new_result);
1651 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1653 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1654 && DECL_INITIAL (new_result))
1656 if (DECL_INITIAL (old_result))
1657 DECL_UNINLINABLE (old_result) = 1;
1659 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1660 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1661 DECL_NOT_REALLY_EXTERN (old_result)
1662 = DECL_NOT_REALLY_EXTERN (new_result);
1663 DECL_INTERFACE_KNOWN (old_result)
1664 = DECL_INTERFACE_KNOWN (new_result);
1665 DECL_DECLARED_INLINE_P (old_result)
1666 = DECL_DECLARED_INLINE_P (new_result);
1667 DECL_DISREGARD_INLINE_LIMITS (old_result)
1668 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1673 DECL_DECLARED_INLINE_P (old_result)
1674 |= DECL_DECLARED_INLINE_P (new_result);
1675 DECL_DISREGARD_INLINE_LIMITS (old_result)
1676 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1677 check_redeclaration_exception_specification (newdecl, olddecl);
1681 /* If the new declaration is a definition, update the file and
1682 line information on the declaration, and also make
1683 the old declaration the same definition. */
1684 if (DECL_INITIAL (new_result) != NULL_TREE)
1686 DECL_SOURCE_LOCATION (olddecl)
1687 = DECL_SOURCE_LOCATION (old_result)
1688 = DECL_SOURCE_LOCATION (newdecl);
1689 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1690 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1693 DECL_ARGUMENTS (old_result)
1694 = DECL_ARGUMENTS (new_result);
1695 for (parm = DECL_ARGUMENTS (old_result); parm;
1696 parm = TREE_CHAIN (parm))
1697 DECL_CONTEXT (parm) = old_result;
1706 /* Automatically handles default parameters. */
1707 tree oldtype = TREE_TYPE (olddecl);
1710 /* Merge the data types specified in the two decls. */
1711 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1713 /* If merge_types produces a non-typedef type, just use the old type. */
1714 if (TREE_CODE (newdecl) == TYPE_DECL
1715 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1718 if (TREE_CODE (newdecl) == VAR_DECL)
1720 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1721 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1722 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1723 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1724 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1725 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1727 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1728 if (DECL_LANG_SPECIFIC (olddecl)
1729 && CP_DECL_THREADPRIVATE_P (olddecl))
1731 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1732 if (!DECL_LANG_SPECIFIC (newdecl))
1733 retrofit_lang_decl (newdecl);
1735 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1736 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1740 /* Do this after calling `merge_types' so that default
1741 parameters don't confuse us. */
1742 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1743 check_redeclaration_exception_specification (newdecl, olddecl);
1744 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1746 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1747 check_default_args (newdecl);
1749 /* Lay the type out, unless already done. */
1750 if (! same_type_p (newtype, oldtype)
1751 && TREE_TYPE (newdecl) != error_mark_node
1752 && !(processing_template_decl && uses_template_parms (newdecl)))
1753 layout_type (TREE_TYPE (newdecl));
1755 if ((TREE_CODE (newdecl) == VAR_DECL
1756 || TREE_CODE (newdecl) == PARM_DECL
1757 || TREE_CODE (newdecl) == RESULT_DECL
1758 || TREE_CODE (newdecl) == FIELD_DECL
1759 || TREE_CODE (newdecl) == TYPE_DECL)
1760 && !(processing_template_decl && uses_template_parms (newdecl)))
1761 layout_decl (newdecl, 0);
1763 /* Merge the type qualifiers. */
1764 if (TREE_READONLY (newdecl))
1765 TREE_READONLY (olddecl) = 1;
1766 if (TREE_THIS_VOLATILE (newdecl))
1767 TREE_THIS_VOLATILE (olddecl) = 1;
1768 if (TREE_NOTHROW (newdecl))
1769 TREE_NOTHROW (olddecl) = 1;
1771 /* Merge deprecatedness. */
1772 if (TREE_DEPRECATED (newdecl))
1773 TREE_DEPRECATED (olddecl) = 1;
1775 /* Preserve function specific target and optimization options */
1776 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1778 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1779 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1780 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1781 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1783 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1784 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1785 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1786 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1789 /* Merge the initialization information. */
1790 if (DECL_INITIAL (newdecl) == NULL_TREE
1791 && DECL_INITIAL (olddecl) != NULL_TREE)
1793 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1794 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1795 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1797 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1798 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1802 /* Merge the section attribute.
1803 We want to issue an error if the sections conflict but that must be
1804 done later in decl_attributes since we are called before attributes
1806 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1807 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1809 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1811 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1812 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1813 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1814 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1815 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1816 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1817 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1818 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1819 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1820 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1821 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1822 /* Keep the old RTL. */
1823 COPY_DECL_RTL (olddecl, newdecl);
1825 else if (TREE_CODE (newdecl) == VAR_DECL
1826 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1828 /* Keep the old RTL. We cannot keep the old RTL if the old
1829 declaration was for an incomplete object and the new
1830 declaration is not since many attributes of the RTL will
1832 COPY_DECL_RTL (olddecl, newdecl);
1835 /* If cannot merge, then use the new type and qualifiers,
1836 and don't preserve the old rtl. */
1839 /* Clean out any memory we had of the old declaration. */
1840 tree oldstatic = value_member (olddecl, static_aggregates);
1842 TREE_VALUE (oldstatic) = error_mark_node;
1844 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1845 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1846 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1847 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1850 /* Merge the storage class information. */
1851 merge_weak (newdecl, olddecl);
1853 if (DECL_ONE_ONLY (olddecl))
1854 DECL_COMDAT_GROUP (newdecl) = DECL_COMDAT_GROUP (olddecl);
1856 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1857 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1858 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1859 if (! DECL_EXTERNAL (olddecl))
1860 DECL_EXTERNAL (newdecl) = 0;
1862 new_template_info = NULL_TREE;
1863 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1865 bool new_redefines_gnu_inline = false;
1867 if (new_defines_function
1868 && ((DECL_INTERFACE_KNOWN (olddecl)
1869 && TREE_CODE (olddecl) == FUNCTION_DECL)
1870 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1871 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1872 == FUNCTION_DECL))))
1876 if (TREE_CODE (fn) == TEMPLATE_DECL)
1877 fn = DECL_TEMPLATE_RESULT (olddecl);
1879 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1882 if (!new_redefines_gnu_inline)
1884 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1885 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1886 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1888 DECL_TEMPLATE_INSTANTIATED (newdecl)
1889 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1890 DECL_ODR_USED (newdecl) |= DECL_ODR_USED (olddecl);
1892 /* If the OLDDECL is an instantiation and/or specialization,
1893 then the NEWDECL must be too. But, it may not yet be marked
1894 as such if the caller has created NEWDECL, but has not yet
1895 figured out that it is a redeclaration. */
1896 if (!DECL_USE_TEMPLATE (newdecl))
1897 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1899 /* Don't really know how much of the language-specific
1900 values we should copy from old to new. */
1901 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1902 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1903 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1904 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1906 if (LANG_DECL_HAS_MIN (newdecl))
1908 DECL_LANG_SPECIFIC (newdecl)->u.min.u2 =
1909 DECL_LANG_SPECIFIC (olddecl)->u.min.u2;
1910 if (DECL_TEMPLATE_INFO (newdecl))
1911 new_template_info = DECL_TEMPLATE_INFO (newdecl);
1912 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1914 /* Only functions have these fields. */
1915 if (TREE_CODE (newdecl) == FUNCTION_DECL
1916 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1918 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1919 olddecl_friend = DECL_FRIEND_P (olddecl);
1920 hidden_friend = (DECL_ANTICIPATED (olddecl)
1921 && DECL_HIDDEN_FRIEND_P (olddecl)
1922 && newdecl_is_friend);
1923 DECL_BEFRIENDING_CLASSES (newdecl)
1924 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1925 DECL_BEFRIENDING_CLASSES (olddecl));
1926 /* DECL_THUNKS is only valid for virtual functions,
1927 otherwise it is a DECL_FRIEND_CONTEXT. */
1928 if (DECL_VIRTUAL_P (newdecl))
1929 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1933 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1937 /* Merge parameter attributes. */
1938 tree oldarg, newarg;
1939 for (oldarg = DECL_ARGUMENTS(olddecl),
1940 newarg = DECL_ARGUMENTS(newdecl);
1942 oldarg = TREE_CHAIN(oldarg), newarg = TREE_CHAIN(newarg)) {
1943 DECL_ATTRIBUTES (newarg)
1944 = (*targetm.merge_decl_attributes) (oldarg, newarg);
1945 DECL_ATTRIBUTES (oldarg) = DECL_ATTRIBUTES (newarg);
1948 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1949 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1951 /* If newdecl is not a specialization, then it is not a
1952 template-related function at all. And that means that we
1953 should have exited above, returning 0. */
1954 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1956 if (DECL_ODR_USED (olddecl))
1957 /* From [temp.expl.spec]:
1959 If a template, a member template or the member of a class
1960 template is explicitly specialized then that
1961 specialization shall be declared before the first use of
1962 that specialization that would cause an implicit
1963 instantiation to take place, in every translation unit in
1964 which such a use occurs. */
1965 error ("explicit specialization of %qD after first use",
1968 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1970 /* Don't propagate visibility from the template to the
1971 specialization here. We'll do that in determine_visibility if
1973 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1975 /* [temp.expl.spec/14] We don't inline explicit specialization
1976 just because the primary template says so. */
1978 else if (new_defines_function && DECL_INITIAL (olddecl))
1980 /* Never inline re-defined extern inline functions.
1981 FIXME: this could be better handled by keeping both
1982 function as separate declarations. */
1983 DECL_UNINLINABLE (newdecl) = 1;
1987 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1988 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1990 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1992 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1993 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1995 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1996 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1997 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1998 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
2001 /* Preserve abstractness on cloned [cd]tors. */
2002 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
2004 /* Update newdecl's parms to point at olddecl. */
2005 for (parm = DECL_ARGUMENTS (newdecl); parm;
2006 parm = TREE_CHAIN (parm))
2007 DECL_CONTEXT (parm) = olddecl;
2011 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
2012 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
2013 COPY_DECL_RTL (newdecl, olddecl);
2015 if (! types_match || new_defines_function)
2017 /* These need to be copied so that the names are available.
2018 Note that if the types do match, we'll preserve inline
2019 info and other bits, but if not, we won't. */
2020 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
2021 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
2023 if (new_defines_function)
2024 /* If defining a function declared with other language
2025 linkage, use the previously declared language linkage. */
2026 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2027 else if (types_match)
2029 /* If redeclaring a builtin function, and not a definition,
2030 it stays built in. */
2031 if (DECL_BUILT_IN (olddecl))
2033 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2034 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2035 /* If we're keeping the built-in definition, keep the rtl,
2036 regardless of declaration matches. */
2037 COPY_DECL_RTL (olddecl, newdecl);
2040 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2041 /* Don't clear out the arguments if we're just redeclaring a
2043 if (DECL_ARGUMENTS (olddecl))
2044 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2047 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2048 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2050 /* Now preserve various other info from the definition. */
2051 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2052 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2053 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2054 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2056 /* Warn about conflicting visibility specifications. */
2057 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2058 && DECL_VISIBILITY_SPECIFIED (newdecl)
2059 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2061 warning_at (input_location, OPT_Wattributes,
2062 "%q+D: visibility attribute ignored because it", newdecl);
2063 warning_at (DECL_SOURCE_LOCATION (olddecl), OPT_Wattributes,
2064 "conflicts with previous declaration here");
2066 /* Choose the declaration which specified visibility. */
2067 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2069 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2070 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2072 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2073 so keep this behavior. */
2074 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2076 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2077 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2080 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2081 with that from NEWDECL below. */
2082 if (DECL_LANG_SPECIFIC (olddecl))
2084 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2085 != DECL_LANG_SPECIFIC (newdecl));
2086 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2089 /* Merge the USED information. */
2090 if (TREE_USED (olddecl))
2091 TREE_USED (newdecl) = 1;
2092 else if (TREE_USED (newdecl))
2093 TREE_USED (olddecl) = 1;
2095 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2099 function_size = sizeof (struct tree_decl_common);
2101 memcpy ((char *) olddecl + sizeof (struct tree_common),
2102 (char *) newdecl + sizeof (struct tree_common),
2103 function_size - sizeof (struct tree_common));
2105 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2106 (char *) newdecl + sizeof (struct tree_decl_common),
2107 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2108 if (new_template_info)
2109 /* If newdecl is a template instantiation, it is possible that
2110 the following sequence of events has occurred:
2112 o A friend function was declared in a class template. The
2113 class template was instantiated.
2115 o The instantiation of the friend declaration was
2116 recorded on the instantiation list, and is newdecl.
2118 o Later, however, instantiate_class_template called pushdecl
2119 on the newdecl to perform name injection. But, pushdecl in
2120 turn called duplicate_decls when it discovered that another
2121 declaration of a global function with the same name already
2124 o Here, in duplicate_decls, we decided to clobber newdecl.
2126 If we're going to do that, we'd better make sure that
2127 olddecl, and not newdecl, is on the list of
2128 instantiations so that if we try to do the instantiation
2129 again we won't get the clobbered declaration. */
2130 reregister_specialization (newdecl,
2136 size_t size = tree_code_size (TREE_CODE (olddecl));
2137 memcpy ((char *) olddecl + sizeof (struct tree_common),
2138 (char *) newdecl + sizeof (struct tree_common),
2139 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2140 switch (TREE_CODE (olddecl))
2150 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2151 (char *) newdecl + sizeof (struct tree_decl_common),
2152 size - sizeof (struct tree_decl_common)
2153 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2157 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2158 (char *) newdecl + sizeof (struct tree_decl_common),
2159 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2160 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2164 DECL_UID (olddecl) = olddecl_uid;
2166 DECL_FRIEND_P (olddecl) = 1;
2169 DECL_ANTICIPATED (olddecl) = 1;
2170 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2173 /* NEWDECL contains the merged attribute lists.
2174 Update OLDDECL to be the same. */
2175 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2177 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2178 so that encode_section_info has a chance to look at the new decl
2179 flags and attributes. */
2180 if (DECL_RTL_SET_P (olddecl)
2181 && (TREE_CODE (olddecl) == FUNCTION_DECL
2182 || (TREE_CODE (olddecl) == VAR_DECL
2183 && TREE_STATIC (olddecl))))
2184 make_decl_rtl (olddecl);
2186 /* The NEWDECL will no longer be needed. Because every out-of-class
2187 declaration of a member results in a call to duplicate_decls,
2188 freeing these nodes represents in a significant savings. */
2194 /* Return zero if the declaration NEWDECL is valid
2195 when the declaration OLDDECL (assumed to be for the same name)
2196 has already been seen.
2197 Otherwise return an error message format string with a %s
2198 where the identifier should go. */
2201 redeclaration_error_message (tree newdecl, tree olddecl)
2203 if (TREE_CODE (newdecl) == TYPE_DECL)
2205 /* Because C++ can put things into name space for free,
2206 constructs like "typedef struct foo { ... } foo"
2207 would look like an erroneous redeclaration. */
2208 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2211 return "redefinition of %q#D";
2213 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2215 /* If this is a pure function, its olddecl will actually be
2216 the original initialization to `0' (which we force to call
2217 abort()). Don't complain about redefinition in this case. */
2218 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2219 && DECL_INITIAL (olddecl) == NULL_TREE)
2222 /* If both functions come from different namespaces, this is not
2223 a redeclaration - this is a conflict with a used function. */
2224 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2225 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2226 && ! decls_match (olddecl, newdecl))
2227 return "%qD conflicts with used function";
2229 /* We'll complain about linkage mismatches in
2230 warn_extern_redeclared_static. */
2232 /* Defining the same name twice is no good. */
2233 if (DECL_INITIAL (olddecl) != NULL_TREE
2234 && DECL_INITIAL (newdecl) != NULL_TREE)
2236 if (DECL_NAME (olddecl) == NULL_TREE)
2237 return "%q#D not declared in class";
2238 else if (!GNU_INLINE_P (olddecl)
2239 || GNU_INLINE_P (newdecl))
2240 return "redefinition of %q#D";
2243 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2245 bool olda = GNU_INLINE_P (olddecl);
2246 bool newa = GNU_INLINE_P (newdecl);
2251 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2253 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2259 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2263 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2265 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2266 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2267 return "redefinition of %q#D";
2271 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2272 || (DECL_TEMPLATE_RESULT (newdecl)
2273 == DECL_TEMPLATE_RESULT (olddecl)))
2276 nt = DECL_TEMPLATE_RESULT (newdecl);
2277 if (DECL_TEMPLATE_INFO (nt))
2278 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2279 ot = DECL_TEMPLATE_RESULT (olddecl);
2280 if (DECL_TEMPLATE_INFO (ot))
2281 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2282 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2283 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2284 return "redefinition of %q#D";
2286 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2288 bool olda = GNU_INLINE_P (ot);
2289 bool newa = GNU_INLINE_P (nt);
2294 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2296 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2300 /* Core issue #226 (C++0x):
2302 If a friend function template declaration specifies a
2303 default template-argument, that declaration shall be a
2304 definition and shall be the only declaration of the
2305 function template in the translation unit. */
2306 if ((cxx_dialect != cxx98)
2307 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2308 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2309 /*is_primary=*/1, /*is_partial=*/0,
2310 /*is_friend_decl=*/2))
2311 return "redeclaration of friend %q#D may not have default template arguments";
2315 else if (TREE_CODE (newdecl) == VAR_DECL
2316 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2317 && (! DECL_LANG_SPECIFIC (olddecl)
2318 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2319 || DECL_THREAD_LOCAL_P (newdecl)))
2321 /* Only variables can be thread-local, and all declarations must
2322 agree on this property. */
2323 if (DECL_THREAD_LOCAL_P (newdecl))
2324 return "thread-local declaration of %q#D follows "
2325 "non-thread-local declaration";
2327 return "non-thread-local declaration of %q#D follows "
2328 "thread-local declaration";
2330 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2332 /* The objects have been declared at namespace scope. If either
2333 is a member of an anonymous union, then this is an invalid
2334 redeclaration. For example:
2340 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2341 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2342 return "redeclaration of %q#D";
2343 /* If at least one declaration is a reference, there is no
2344 conflict. For example:
2350 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2352 /* Reject two definitions. */
2353 return "redefinition of %q#D";
2357 /* Objects declared with block scope: */
2358 /* Reject two definitions, and reject a definition
2359 together with an external reference. */
2360 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2361 return "redeclaration of %q#D";
2366 /* Hash and equality functions for the named_label table. */
2369 named_label_entry_hash (const void *data)
2371 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2372 return DECL_UID (ent->label_decl);
2376 named_label_entry_eq (const void *a, const void *b)
2378 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2379 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2380 return ent_a->label_decl == ent_b->label_decl;
2383 /* Create a new label, named ID. */
2386 make_label_decl (tree id, int local_p)
2388 struct named_label_entry *ent;
2392 decl = build_decl (input_location, LABEL_DECL, id, void_type_node);
2394 DECL_CONTEXT (decl) = current_function_decl;
2395 DECL_MODE (decl) = VOIDmode;
2396 C_DECLARED_LABEL_FLAG (decl) = local_p;
2398 /* Say where one reference is to the label, for the sake of the
2399 error if it is not defined. */
2400 DECL_SOURCE_LOCATION (decl) = input_location;
2402 /* Record the fact that this identifier is bound to this label. */
2403 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2405 /* Create the label htab for the function on demand. */
2407 named_labels = htab_create_ggc (13, named_label_entry_hash,
2408 named_label_entry_eq, NULL);
2410 /* Record this label on the list of labels used in this function.
2411 We do this before calling make_label_decl so that we get the
2412 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2413 ent = GGC_CNEW (struct named_label_entry);
2414 ent->label_decl = decl;
2416 slot = htab_find_slot (named_labels, ent, INSERT);
2417 gcc_assert (*slot == NULL);
2423 /* Look for a label named ID in the current function. If one cannot
2424 be found, create one. (We keep track of used, but undefined,
2425 labels, and complain about them at the end of a function.) */
2428 lookup_label (tree id)
2432 timevar_push (TV_NAME_LOOKUP);
2433 /* You can't use labels at global scope. */
2434 if (current_function_decl == NULL_TREE)
2436 error ("label %qE referenced outside of any function", id);
2437 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2440 /* See if we've already got this label. */
2441 decl = IDENTIFIER_LABEL_VALUE (id);
2442 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2443 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2445 decl = make_label_decl (id, /*local_p=*/0);
2446 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2449 /* Declare a local label named ID. */
2452 declare_local_label (tree id)
2456 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2457 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2458 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2459 current_binding_level->shadowed_labels);
2460 current_binding_level->shadowed_labels = shadow;
2462 decl = make_label_decl (id, /*local_p=*/1);
2463 TREE_VALUE (shadow) = decl;
2468 /* Returns nonzero if it is ill-formed to jump past the declaration of
2469 DECL. Returns 2 if it's also a real problem. */
2472 decl_jump_unsafe (tree decl)
2474 /* [stmt.dcl]/3: A program that jumps from a point where a local variable
2475 with automatic storage duration is not in scope to a point where it is
2476 in scope is ill-formed unless the variable has scalar type, class type
2477 with a trivial default constructor and a trivial destructor, a
2478 cv-qualified version of one of these types, or an array of one of the
2479 preceding types and is declared without an initializer (8.5). */
2480 tree type = TREE_TYPE (decl);
2482 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2483 || type == error_mark_node)
2486 type = strip_array_types (type);
2488 if (type_has_nontrivial_default_init (TREE_TYPE (decl))
2489 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2492 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2498 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2501 identify_goto (tree decl, const location_t *locus)
2504 permerror (input_location, "jump to label %qD", decl);
2506 permerror (input_location, "jump to case label");
2508 permerror (*locus, " from here");
2511 /* Check that a single previously seen jump to a newly defined label
2512 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2513 the jump context; NAMES are the names in scope in LEVEL at the jump
2514 context; LOCUS is the source position of the jump or 0. Returns
2515 true if all is well. */
2518 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2519 bool exited_omp, const location_t *locus)
2521 struct cp_binding_level *b;
2522 bool identified = false, saw_eh = false, saw_omp = false;
2526 identify_goto (decl, locus);
2527 error (" exits OpenMP structured block");
2528 identified = saw_omp = true;
2531 for (b = current_binding_level; b ; b = b->level_chain)
2533 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2535 for (new_decls = b->names; new_decls != old_decls;
2536 new_decls = TREE_CHAIN (new_decls))
2538 int problem = decl_jump_unsafe (new_decls);
2544 identify_goto (decl, locus);
2548 error (" crosses initialization of %q+#D", new_decls);
2550 permerror (input_location, " enters scope of %q+#D which has "
2551 "non-trivial destructor", new_decls);
2556 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2560 identify_goto (decl, locus);
2563 if (b->kind == sk_try)
2564 error (" enters try block");
2566 error (" enters catch block");
2569 if (b->kind == sk_omp && !saw_omp)
2573 identify_goto (decl, locus);
2576 error (" enters OpenMP structured block");
2585 check_previous_goto (tree decl, struct named_label_use_entry *use)
2587 check_previous_goto_1 (decl, use->binding_level,
2588 use->names_in_scope, use->in_omp_scope,
2589 &use->o_goto_locus);
2593 check_switch_goto (struct cp_binding_level* level)
2595 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2598 /* Check that a new jump to a label DECL is OK. Called by
2599 finish_goto_stmt. */
2602 check_goto (tree decl)
2604 struct named_label_entry *ent, dummy;
2605 bool saw_catch = false, identified = false;
2608 /* We can't know where a computed goto is jumping.
2609 So we assume that it's OK. */
2610 if (TREE_CODE (decl) != LABEL_DECL)
2613 /* We didn't record any information about this label when we created it,
2614 and there's not much point since it's trivial to analyze as a return. */
2615 if (decl == cdtor_label)
2618 dummy.label_decl = decl;
2619 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2620 gcc_assert (ent != NULL);
2622 /* If the label hasn't been defined yet, defer checking. */
2623 if (! DECL_INITIAL (decl))
2625 struct named_label_use_entry *new_use;
2627 /* Don't bother creating another use if the last goto had the
2628 same data, and will therefore create the same set of errors. */
2630 && ent->uses->names_in_scope == current_binding_level->names)
2633 new_use = GGC_NEW (struct named_label_use_entry);
2634 new_use->binding_level = current_binding_level;
2635 new_use->names_in_scope = current_binding_level->names;
2636 new_use->o_goto_locus = input_location;
2637 new_use->in_omp_scope = false;
2639 new_use->next = ent->uses;
2640 ent->uses = new_use;
2644 if (ent->in_try_scope || ent->in_catch_scope
2645 || ent->in_omp_scope || ent->bad_decls)
2647 permerror (input_location, "jump to label %q+D", decl);
2648 permerror (input_location, " from here");
2652 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2654 tree b = TREE_VALUE (bad);
2655 int u = decl_jump_unsafe (b);
2657 if (u > 1 && DECL_ARTIFICIAL (b))
2659 /* Can't skip init of __exception_info. */
2660 error_at (DECL_SOURCE_LOCATION (b), " enters catch block");
2664 error (" skips initialization of %q+#D", b);
2666 permerror (input_location, " enters scope of %q+#D which has "
2667 "non-trivial destructor", b);
2670 if (ent->in_try_scope)
2671 error (" enters try block");
2672 else if (ent->in_catch_scope && !saw_catch)
2673 error (" enters catch block");
2675 if (ent->in_omp_scope)
2676 error (" enters OpenMP structured block");
2677 else if (flag_openmp)
2679 struct cp_binding_level *b;
2680 for (b = current_binding_level; b ; b = b->level_chain)
2682 if (b == ent->binding_level)
2684 if (b->kind == sk_omp)
2688 permerror (input_location, "jump to label %q+D", decl);
2689 permerror (input_location, " from here");
2692 error (" exits OpenMP structured block");
2699 /* Check that a return is ok wrt OpenMP structured blocks.
2700 Called by finish_return_stmt. Returns true if all is well. */
2703 check_omp_return (void)
2705 struct cp_binding_level *b;
2706 for (b = current_binding_level; b ; b = b->level_chain)
2707 if (b->kind == sk_omp)
2709 error ("invalid exit from OpenMP structured block");
2715 /* Define a label, specifying the location in the source file.
2716 Return the LABEL_DECL node for the label. */
2719 define_label (location_t location, tree name)
2721 struct named_label_entry *ent, dummy;
2722 struct cp_binding_level *p;
2725 timevar_push (TV_NAME_LOOKUP);
2727 decl = lookup_label (name);
2729 dummy.label_decl = decl;
2730 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2731 gcc_assert (ent != NULL);
2733 /* After labels, make any new cleanups in the function go into their
2734 own new (temporary) binding contour. */
2735 for (p = current_binding_level;
2736 p->kind != sk_function_parms;
2738 p->more_cleanups_ok = 0;
2740 if (name == get_identifier ("wchar_t"))
2741 permerror (input_location, "label named wchar_t");
2743 if (DECL_INITIAL (decl) != NULL_TREE)
2745 error ("duplicate label %qD", decl);
2746 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2750 struct named_label_use_entry *use;
2752 /* Mark label as having been defined. */
2753 DECL_INITIAL (decl) = error_mark_node;
2754 /* Say where in the source. */
2755 DECL_SOURCE_LOCATION (decl) = location;
2757 ent->binding_level = current_binding_level;
2758 ent->names_in_scope = current_binding_level->names;
2760 for (use = ent->uses; use ; use = use->next)
2761 check_previous_goto (decl, use);
2765 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2770 struct cp_binding_level *level;
2771 struct cp_switch *next;
2772 /* The SWITCH_STMT being built. */
2774 /* A splay-tree mapping the low element of a case range to the high
2775 element, or NULL_TREE if there is no high element. Used to
2776 determine whether or not a new case label duplicates an old case
2777 label. We need a tree, rather than simply a hash table, because
2778 of the GNU case range extension. */
2782 /* A stack of the currently active switch statements. The innermost
2783 switch statement is on the top of the stack. There is no need to
2784 mark the stack for garbage collection because it is only active
2785 during the processing of the body of a function, and we never
2786 collect at that point. */
2788 static struct cp_switch *switch_stack;
2790 /* Called right after a switch-statement condition is parsed.
2791 SWITCH_STMT is the switch statement being parsed. */
2794 push_switch (tree switch_stmt)
2796 struct cp_switch *p = XNEW (struct cp_switch);
2797 p->level = current_binding_level;
2798 p->next = switch_stack;
2799 p->switch_stmt = switch_stmt;
2800 p->cases = splay_tree_new (case_compare, NULL, NULL);
2807 struct cp_switch *cs = switch_stack;
2808 location_t switch_location;
2810 /* Emit warnings as needed. */
2811 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2812 switch_location = EXPR_LOCATION (cs->switch_stmt);
2814 switch_location = input_location;
2815 if (!processing_template_decl)
2816 c_do_switch_warnings (cs->cases, switch_location,
2817 SWITCH_STMT_TYPE (cs->switch_stmt),
2818 SWITCH_STMT_COND (cs->switch_stmt));
2820 splay_tree_delete (cs->cases);
2821 switch_stack = switch_stack->next;
2825 /* Note that we've seen a definition of a case label, and complain if this
2826 is a bad place for one. */
2829 finish_case_label (location_t loc, tree low_value, tree high_value)
2832 struct cp_binding_level *p;
2834 if (processing_template_decl)
2838 /* For templates, just add the case label; we'll do semantic
2839 analysis at instantiation-time. */
2840 label = build_decl (loc, LABEL_DECL, NULL_TREE, NULL_TREE);
2841 return add_stmt (build_case_label (loc, low_value, high_value, label));
2844 /* Find the condition on which this switch statement depends. */
2845 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2846 if (cond && TREE_CODE (cond) == TREE_LIST)
2847 cond = TREE_VALUE (cond);
2849 if (!check_switch_goto (switch_stack->level))
2850 return error_mark_node;
2852 r = c_add_case_label (loc, switch_stack->cases, cond,
2853 SWITCH_STMT_TYPE (switch_stack->switch_stmt),
2854 low_value, high_value);
2856 /* After labels, make any new cleanups in the function go into their
2857 own new (temporary) binding contour. */
2858 for (p = current_binding_level;
2859 p->kind != sk_function_parms;
2861 p->more_cleanups_ok = 0;
2866 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2869 typename_hash (const void* k)
2872 const_tree const t = (const_tree) k;
2874 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2875 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2880 typedef struct typename_info {
2888 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2889 really of type `typename_info*' */
2892 typename_compare (const void * k1, const void * k2)
2894 const_tree const t1 = (const_tree) k1;
2895 const typename_info *const t2 = (const typename_info *) k2;
2897 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2898 && TYPE_CONTEXT (t1) == t2->scope
2899 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2900 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2901 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2904 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2905 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2907 Returns the new TYPENAME_TYPE. */
2909 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2912 build_typename_type (tree context, tree name, tree fullname,
2913 enum tag_types tag_type)
2921 if (typename_htab == NULL)
2922 typename_htab = htab_create_ggc (61, &typename_hash,
2923 &typename_compare, NULL);
2925 ti.scope = FROB_CONTEXT (context);
2927 ti.template_id = fullname;
2928 ti.enum_p = tag_type == enum_type;
2929 ti.class_p = (tag_type == class_type
2930 || tag_type == record_type
2931 || tag_type == union_type);
2932 hash = (htab_hash_pointer (ti.scope)
2933 ^ htab_hash_pointer (ti.name));
2935 /* See if we already have this type. */
2936 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2941 /* Build the TYPENAME_TYPE. */
2942 t = cxx_make_type (TYPENAME_TYPE);
2943 TYPE_CONTEXT (t) = ti.scope;
2944 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2945 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2946 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2948 /* Build the corresponding TYPE_DECL. */
2949 d = build_decl (input_location, TYPE_DECL, name, t);
2950 TYPE_NAME (TREE_TYPE (d)) = d;
2951 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2952 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2953 DECL_ARTIFICIAL (d) = 1;
2955 /* Store it in the hash table. */
2958 /* TYPENAME_TYPEs must always be compared structurally, because
2959 they may or may not resolve down to another type depending on
2960 the currently open classes. */
2961 SET_TYPE_STRUCTURAL_EQUALITY (t);
2967 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2968 provided to name the type. Returns an appropriate type, unless an
2969 error occurs, in which case error_mark_node is returned. If we
2970 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2971 return that, rather than the _TYPE it corresponds to, in other
2972 cases we look through the type decl. If TF_ERROR is set, complain
2973 about errors, otherwise be quiet. */
2976 make_typename_type (tree context, tree name, enum tag_types tag_type,
2977 tsubst_flags_t complain)
2983 if (name == error_mark_node
2984 || context == NULL_TREE
2985 || context == error_mark_node)
2986 return error_mark_node;
2990 if (!(TYPE_LANG_SPECIFIC (name)
2991 && (CLASSTYPE_IS_TEMPLATE (name)
2992 || CLASSTYPE_USE_TEMPLATE (name))))
2993 name = TYPE_IDENTIFIER (name);
2995 /* Create a TEMPLATE_ID_EXPR for the type. */
2996 name = build_nt (TEMPLATE_ID_EXPR,
2997 CLASSTYPE_TI_TEMPLATE (name),
2998 CLASSTYPE_TI_ARGS (name));
3000 else if (TREE_CODE (name) == TYPE_DECL)
3001 name = DECL_NAME (name);
3005 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
3007 name = TREE_OPERAND (name, 0);
3008 if (TREE_CODE (name) == TEMPLATE_DECL)
3009 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
3010 else if (TREE_CODE (name) == OVERLOAD)
3012 error ("%qD is not a type", name);
3013 return error_mark_node;
3016 if (TREE_CODE (name) == TEMPLATE_DECL)
3018 error ("%qD used without template parameters", name);
3019 return error_mark_node;
3021 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3022 gcc_assert (TYPE_P (context));
3024 if (!MAYBE_CLASS_TYPE_P (context))
3026 if (complain & tf_error)
3027 error ("%q#T is not a class", context);
3028 return error_mark_node;
3031 /* When the CONTEXT is a dependent type, NAME could refer to a
3032 dependent base class of CONTEXT. But look inside it anyway
3033 if CONTEXT is a currently open scope, in case it refers to a
3034 member of the current instantiation or a non-dependent base;
3035 lookup will stop when we hit a dependent base. */
3036 if (!dependent_scope_p (context))
3037 /* We should only set WANT_TYPE when we're a nested typename type.
3038 Then we can give better diagnostics if we find a non-type. */
3039 t = lookup_field (context, name, 2, /*want_type=*/true);
3043 if ((!t || TREE_CODE (t) == TREE_LIST) && dependent_type_p (context))
3044 return build_typename_type (context, name, fullname, tag_type);
3046 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
3050 if (complain & tf_error)
3051 error (want_template ? "no class template named %q#T in %q#T"
3052 : "no type named %q#T in %q#T", name, context);
3053 return error_mark_node;
3056 /* Pull out the template from an injected-class-name (or multiple). */
3058 t = maybe_get_template_decl_from_type_decl (t);
3060 if (TREE_CODE (t) == TREE_LIST)
3062 if (complain & tf_error)
3064 error ("lookup of %qT in %qT is ambiguous", name, context);
3065 print_candidates (t);
3067 return error_mark_node;
3070 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3072 if (complain & tf_error)
3073 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3075 return error_mark_node;
3077 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3079 if (complain & tf_error)
3080 error ("%<typename %T::%D%> names %q#T, which is not a type",
3082 return error_mark_node;
3085 if (complain & tf_error)
3086 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3088 /* If we are currently parsing a template and if T is a typedef accessed
3089 through CONTEXT then we need to remember and check access of T at
3090 template instantiation time. */
3091 add_typedef_to_current_template_for_access_check (t, context, input_location);
3094 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3096 /*entering_scope=*/0,
3097 tf_warning_or_error | tf_user);
3099 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3105 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3106 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3107 in which case error_mark_node is returned.
3109 If PARM_LIST is non-NULL, also make sure that the template parameter
3110 list of TEMPLATE_DECL matches.
3112 If COMPLAIN zero, don't complain about any errors that occur. */
3115 make_unbound_class_template (tree context, tree name, tree parm_list,
3116 tsubst_flags_t complain)
3122 name = TYPE_IDENTIFIER (name);
3123 else if (DECL_P (name))
3124 name = DECL_NAME (name);
3125 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3127 if (!dependent_type_p (context)
3128 || currently_open_class (context))
3130 tree tmpl = NULL_TREE;
3132 if (MAYBE_CLASS_TYPE_P (context))
3133 tmpl = lookup_field (context, name, 0, false);
3135 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3137 if (complain & tf_error)
3138 error ("no class template named %q#T in %q#T", name, context);
3139 return error_mark_node;
3143 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3145 if (complain & tf_error)
3147 error ("template parameters do not match template");
3148 error ("%q+D declared here", tmpl);
3150 return error_mark_node;
3153 if (complain & tf_error)
3154 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3159 /* Build the UNBOUND_CLASS_TEMPLATE. */
3160 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3161 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3162 TREE_TYPE (t) = NULL_TREE;
3163 SET_TYPE_STRUCTURAL_EQUALITY (t);
3165 /* Build the corresponding TEMPLATE_DECL. */
3166 d = build_decl (input_location, TEMPLATE_DECL, name, t);
3167 TYPE_NAME (TREE_TYPE (d)) = d;
3168 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3169 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3170 DECL_ARTIFICIAL (d) = 1;
3171 DECL_TEMPLATE_PARMS (d) = parm_list;
3178 /* Push the declarations of builtin types into the namespace.
3179 RID_INDEX is the index of the builtin type in the array
3180 RID_POINTERS. NAME is the name used when looking up the builtin
3181 type. TYPE is the _TYPE node for the builtin type. */
3184 record_builtin_type (enum rid rid_index,
3188 tree rname = NULL_TREE, tname = NULL_TREE;
3189 tree tdecl = NULL_TREE;
3191 if ((int) rid_index < (int) RID_MAX)
3192 rname = ridpointers[(int) rid_index];
3194 tname = get_identifier (name);
3196 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3197 eliminated. Built-in types should not be looked up name; their
3198 names are keywords that the parser can recognize. However, there
3199 is code in c-common.c that uses identifier_global_value to look
3200 up built-in types by name. */
3203 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, tname, type);
3204 DECL_ARTIFICIAL (tdecl) = 1;
3205 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3211 tdecl = build_decl (BUILTINS_LOCATION, TYPE_DECL, rname, type);
3212 DECL_ARTIFICIAL (tdecl) = 1;
3214 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3217 if (!TYPE_NAME (type))
3218 TYPE_NAME (type) = tdecl;
3221 debug_hooks->type_decl (tdecl, 0);
3224 /* Record one of the standard Java types.
3225 * Declare it as having the given NAME.
3226 * If SIZE > 0, it is the size of one of the integral types;
3227 * otherwise it is the negative of the size of one of the other types. */
3230 record_builtin_java_type (const char* name, int size)
3234 type = build_nonstandard_integer_type (size, 0);
3235 else if (size > -32)
3238 /* "__java_char" or ""__java_boolean". */
3239 type = build_nonstandard_integer_type (-size, 1);
3240 /* Get the signed type cached and attached to the unsigned type,
3241 so it doesn't get garbage-collected at "random" times,
3242 causing potential codegen differences out of different UIDs
3243 and different alias set numbers. */
3244 stype = build_nonstandard_integer_type (-size, 0);
3245 TREE_CHAIN (type) = stype;
3246 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3249 { /* "__java_float" or ""__java_double". */
3250 type = make_node (REAL_TYPE);
3251 TYPE_PRECISION (type) = - size;
3254 record_builtin_type (RID_MAX, name, type);
3255 decl = TYPE_NAME (type);
3257 /* Suppress generate debug symbol entries for these types,
3258 since for normal C++ they are just clutter.
3259 However, push_lang_context undoes this if extern "Java" is seen. */
3260 DECL_IGNORED_P (decl) = 1;
3262 TYPE_FOR_JAVA (type) = 1;
3266 /* Push a type into the namespace so that the back ends ignore it. */
3269 record_unknown_type (tree type, const char* name)
3271 tree decl = pushdecl (build_decl (UNKNOWN_LOCATION,
3272 TYPE_DECL, get_identifier (name), type));
3273 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3274 DECL_IGNORED_P (decl) = 1;
3275 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3276 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3277 TYPE_ALIGN (type) = 1;
3278 TYPE_USER_ALIGN (type) = 0;
3279 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3282 /* A string for which we should create an IDENTIFIER_NODE at
3285 typedef struct predefined_identifier
3287 /* The name of the identifier. */
3288 const char *const name;
3289 /* The place where the IDENTIFIER_NODE should be stored. */
3291 /* Nonzero if this is the name of a constructor or destructor. */
3292 const int ctor_or_dtor_p;
3293 } predefined_identifier;
3295 /* Create all the predefined identifiers. */
3298 initialize_predefined_identifiers (void)
3300 const predefined_identifier *pid;
3302 /* A table of identifiers to create at startup. */
3303 static const predefined_identifier predefined_identifiers[] = {
3304 { "C++", &lang_name_cplusplus, 0 },
3305 { "C", &lang_name_c, 0 },
3306 { "Java", &lang_name_java, 0 },
3307 /* Some of these names have a trailing space so that it is
3308 impossible for them to conflict with names written by users. */
3309 { "__ct ", &ctor_identifier, 1 },
3310 { "__base_ctor ", &base_ctor_identifier, 1 },
3311 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3312 { "__dt ", &dtor_identifier, 1 },
3313 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3314 { "__base_dtor ", &base_dtor_identifier, 1 },
3315 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3316 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3317 { "nelts", &nelts_identifier, 0 },
3318 { THIS_NAME, &this_identifier, 0 },
3319 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3320 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3321 { "_vptr", &vptr_identifier, 0 },
3322 { "__vtt_parm", &vtt_parm_identifier, 0 },
3323 { "::", &global_scope_name, 0 },
3324 { "std", &std_identifier, 0 },
3328 for (pid = predefined_identifiers; pid->name; ++pid)
3330 *pid->node = get_identifier (pid->name);
3331 if (pid->ctor_or_dtor_p)
3332 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3336 /* Create the predefined scalar types of C,
3337 and some nodes representing standard constants (0, 1, (void *)0).
3338 Initialize the global binding level.
3339 Make definitions for built-in primitive functions. */
3342 cxx_init_decl_processing (void)
3345 tree void_ftype_ptr;
3347 build_common_tree_nodes (flag_signed_char, false);
3349 /* Create all the identifiers we need. */
3350 initialize_predefined_identifiers ();
3352 /* Create the global variables. */
3353 push_to_top_level ();
3355 current_function_decl = NULL_TREE;
3356 current_binding_level = NULL;
3357 /* Enter the global namespace. */
3358 gcc_assert (global_namespace == NULL_TREE);
3359 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3361 TREE_PUBLIC (global_namespace) = 1;
3362 begin_scope (sk_namespace, global_namespace);
3364 current_lang_name = NULL_TREE;
3366 if (flag_visibility_ms_compat)
3367 default_visibility = VISIBILITY_HIDDEN;
3370 current_lang_name = lang_name_c;
3372 /* Create the `std' namespace. */
3373 push_namespace (std_identifier);
3374 std_node = current_namespace;
3377 c_common_nodes_and_builtins ();
3379 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3380 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3381 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3382 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3383 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3384 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3385 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3386 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3388 integer_two_node = build_int_cst (NULL_TREE, 2);
3389 integer_three_node = build_int_cst (NULL_TREE, 3);
3391 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3392 truthvalue_type_node = boolean_type_node;
3393 truthvalue_false_node = boolean_false_node;
3394 truthvalue_true_node = boolean_true_node;
3396 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3399 record_builtin_type (RID_MAX, NULL, string_type_node);
3402 delta_type_node = ptrdiff_type_node;
3403 vtable_index_type = ptrdiff_type_node;
3405 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3406 void_ftype = build_function_type (void_type_node, void_list_node);
3407 void_ftype_ptr = build_function_type (void_type_node,
3408 tree_cons (NULL_TREE,
3412 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3414 /* C++ extensions */
3416 unknown_type_node = make_node (UNKNOWN_TYPE);
3417 record_unknown_type (unknown_type_node, "unknown type");
3419 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3420 TREE_TYPE (unknown_type_node) = unknown_type_node;
3422 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3424 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3425 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3427 init_list_type_node = make_node (UNKNOWN_TYPE);
3428 record_unknown_type (init_list_type_node, "init list");
3431 /* Make sure we get a unique function type, so we can give
3432 its pointer type a name. (This wins for gdb.) */
3433 tree vfunc_type = make_node (FUNCTION_TYPE);
3434 TREE_TYPE (vfunc_type) = integer_type_node;
3435 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3436 layout_type (vfunc_type);
3438 vtable_entry_type = build_pointer_type (vfunc_type);
3440 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3443 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3444 layout_type (vtbl_type_node);
3445 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3446 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3447 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3448 layout_type (vtbl_ptr_type_node);
3449 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3451 push_namespace (get_identifier ("__cxxabiv1"));
3452 abi_node = current_namespace;
3455 global_type_node = make_node (LANG_TYPE);
3456 record_unknown_type (global_type_node, "global type");
3459 current_lang_name = lang_name_cplusplus;
3463 tree bad_alloc_type_node;
3464 tree bad_alloc_decl;
3465 tree newtype, deltype;
3466 tree ptr_ftype_sizetype;
3468 push_namespace (std_identifier);
3469 bad_alloc_id = get_identifier ("bad_alloc");
3470 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3471 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3473 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3474 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3478 = build_function_type (ptr_type_node,
3479 tree_cons (NULL_TREE,
3482 newtype = build_exception_variant
3483 (ptr_ftype_sizetype, add_exception_specifier
3484 (NULL_TREE, bad_alloc_type_node, -1));
3485 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3486 push_cp_library_fn (NEW_EXPR, newtype);
3487 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3488 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3489 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3493 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3495 /* Perform other language dependent initializations. */
3496 init_class_processing ();
3497 init_rtti_processing ();
3498 init_template_processing ();
3500 if (flag_exceptions)
3501 init_exception_processing ();
3503 if (! supports_one_only ())
3506 make_fname_decl = cp_make_fname_decl;
3507 start_fname_decls ();
3509 /* Show we use EH for cleanups. */
3510 if (flag_exceptions)
3511 using_eh_for_cleanups ();
3514 /* Generate an initializer for a function naming variable from
3515 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3516 filled in with the type of the init. */
3519 cp_fname_init (const char* name, tree *type_p)
3521 tree domain = NULL_TREE;
3523 tree init = NULL_TREE;
3528 length = strlen (name);
3529 domain = build_index_type (size_int (length));
3530 init = build_string (length + 1, name);
3533 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3534 type = build_cplus_array_type (type, domain);
3539 TREE_TYPE (init) = type;
3541 init = error_mark_node;
3546 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give
3547 the decl, LOC is the location to give the decl, NAME is the
3548 initialization string and TYPE_DEP indicates whether NAME depended
3549 on the type of the function. We make use of that to detect
3550 __PRETTY_FUNCTION__ inside a template fn. This is being done lazily
3551 at the point of first use, so we mustn't push the decl now. */
3554 cp_make_fname_decl (location_t loc, tree id, int type_dep)
3556 const char *const name = (type_dep && processing_template_decl
3557 ? NULL : fname_as_string (type_dep));
3559 tree init = cp_fname_init (name, &type);
3560 tree decl = build_decl (loc, VAR_DECL, id, type);
3563 free (CONST_CAST (char *, name));
3565 /* As we're using pushdecl_with_scope, we must set the context. */
3566 DECL_CONTEXT (decl) = current_function_decl;
3567 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3569 TREE_STATIC (decl) = 1;
3570 TREE_READONLY (decl) = 1;
3571 DECL_ARTIFICIAL (decl) = 1;
3573 TREE_USED (decl) = 1;
3575 if (current_function_decl)
3577 struct cp_binding_level *b = current_binding_level;
3578 while (b->level_chain->kind != sk_function_parms)
3580 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3581 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3582 LOOKUP_ONLYCONVERTING);
3585 pushdecl_top_level_and_finish (decl, init);
3591 builtin_function_1 (tree decl, tree context, bool is_global)
3593 tree id = DECL_NAME (decl);
3594 const char *name = IDENTIFIER_POINTER (id);
3596 retrofit_lang_decl (decl);
3598 DECL_ARTIFICIAL (decl) = 1;
3599 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3600 SET_DECL_LANGUAGE (decl, lang_c);
3601 /* Runtime library routines are, by definition, available in an
3602 external shared object. */
3603 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3604 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3606 DECL_CONTEXT (decl) = context;
3609 pushdecl_top_level (decl);
3613 /* A function in the user's namespace should have an explicit
3614 declaration before it is used. Mark the built-in function as
3615 anticipated but not actually declared. */
3616 if (name[0] != '_' || name[1] != '_')
3617 DECL_ANTICIPATED (decl) = 1;
3618 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3620 size_t len = strlen (name);
3622 /* Treat __*_chk fortification functions as anticipated as well,
3623 unless they are __builtin_*. */
3624 if (len > strlen ("___chk")
3625 && memcmp (name + len - strlen ("_chk"),
3626 "_chk", strlen ("_chk") + 1) == 0)
3627 DECL_ANTICIPATED (decl) = 1;
3634 cxx_builtin_function (tree decl)
3636 tree id = DECL_NAME (decl);
3637 const char *name = IDENTIFIER_POINTER (id);
3638 /* All builtins that don't begin with an '_' should additionally
3639 go in the 'std' namespace. */
3642 tree decl2 = copy_node(decl);
3643 push_namespace (std_identifier);
3644 builtin_function_1 (decl2, std_node, false);
3648 return builtin_function_1 (decl, NULL_TREE, false);
3651 /* Like cxx_builtin_function, but guarantee the function is added to the global
3652 scope. This is to allow function specific options to add new machine
3653 dependent builtins when the target ISA changes via attribute((target(...)))
3654 which saves space on program startup if the program does not use non-generic
3658 cxx_builtin_function_ext_scope (tree decl)
3661 tree id = DECL_NAME (decl);
3662 const char *name = IDENTIFIER_POINTER (id);
3663 /* All builtins that don't begin with an '_' should additionally
3664 go in the 'std' namespace. */
3667 tree decl2 = copy_node(decl);
3668 push_namespace (std_identifier);
3669 builtin_function_1 (decl2, std_node, true);
3673 return builtin_function_1 (decl, NULL_TREE, true);
3676 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3677 function. Not called directly. */
3680 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3682 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3683 DECL_EXTERNAL (fn) = 1;
3684 TREE_PUBLIC (fn) = 1;
3685 DECL_ARTIFICIAL (fn) = 1;
3686 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3687 SET_DECL_LANGUAGE (fn, lang_c);
3688 /* Runtime library routines are, by definition, available in an
3689 external shared object. */
3690 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3691 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3695 /* Returns the _DECL for a library function with C linkage.
3696 We assume that such functions never throw; if this is incorrect,
3697 callers should unset TREE_NOTHROW. */
3700 build_library_fn (tree name, tree type)
3702 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3703 TREE_NOTHROW (fn) = 1;
3707 /* Returns the _DECL for a library function with C++ linkage. */
3710 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3712 tree fn = build_library_fn_1 (name, operator_code, type);
3713 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3714 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3715 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3719 /* Like build_library_fn, but takes a C string instead of an
3723 build_library_fn_ptr (const char* name, tree type)
3725 return build_library_fn (get_identifier (name), type);
3728 /* Like build_cp_library_fn, but takes a C string instead of an
3732 build_cp_library_fn_ptr (const char* name, tree type)
3734 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3737 /* Like build_library_fn, but also pushes the function so that we will
3738 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3739 may throw exceptions listed in RAISES. */
3742 push_library_fn (tree name, tree type, tree raises)
3747 type = build_exception_variant (type, raises);
3749 fn = build_library_fn (name, type);
3750 pushdecl_top_level (fn);
3754 /* Like build_cp_library_fn, but also pushes the function so that it
3755 will be found by normal lookup. */
3758 push_cp_library_fn (enum tree_code operator_code, tree type)
3760 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3767 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3771 push_void_library_fn (tree name, tree parmtypes)
3773 tree type = build_function_type (void_type_node, parmtypes);
3774 return push_library_fn (name, type, NULL_TREE);
3777 /* Like push_library_fn, but also note that this function throws
3778 and does not return. Used for __throw_foo and the like. */
3781 push_throw_library_fn (tree name, tree type)
3783 tree fn = push_library_fn (name, type, NULL_TREE);
3784 TREE_THIS_VOLATILE (fn) = 1;
3785 TREE_NOTHROW (fn) = 0;
3789 /* When we call finish_struct for an anonymous union, we create
3790 default copy constructors and such. But, an anonymous union
3791 shouldn't have such things; this function undoes the damage to the
3792 anonymous union type T.
3794 (The reason that we create the synthesized methods is that we don't
3795 distinguish `union { int i; }' from `typedef union { int i; } U'.
3796 The first is an anonymous union; the second is just an ordinary
3800 fixup_anonymous_aggr (tree t)
3804 /* Wipe out memory of synthesized methods. */
3805 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3806 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3807 TYPE_HAS_INIT_REF (t) = 0;
3808 TYPE_HAS_CONST_INIT_REF (t) = 0;
3809 TYPE_HAS_ASSIGN_REF (t) = 0;
3810 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3812 /* Splice the implicitly generated functions out of the TYPE_METHODS
3814 q = &TYPE_METHODS (t);
3817 if (DECL_ARTIFICIAL (*q))
3818 *q = TREE_CHAIN (*q);
3820 q = &TREE_CHAIN (*q);
3823 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3824 if (TYPE_METHODS (t))
3826 tree decl = TYPE_MAIN_DECL (t);
3828 if (TREE_CODE (t) != UNION_TYPE)
3829 error_at (DECL_SOURCE_LOCATION (decl),
3830 "an anonymous struct cannot have function members");
3832 error_at (DECL_SOURCE_LOCATION (decl),
3833 "an anonymous union cannot have function members");
3836 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3837 assignment operators (because they cannot have these methods themselves).
3838 For anonymous unions this is already checked because they are not allowed
3839 in any union, otherwise we have to check it. */
3840 if (TREE_CODE (t) != UNION_TYPE)
3844 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3845 if (TREE_CODE (field) == FIELD_DECL)
3847 type = TREE_TYPE (field);
3848 if (CLASS_TYPE_P (type))
3850 if (TYPE_NEEDS_CONSTRUCTING (type))
3851 error ("member %q+#D with constructor not allowed "
3852 "in anonymous aggregate", field);
3853 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3854 error ("member %q+#D with destructor not allowed "
3855 "in anonymous aggregate", field);
3856 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3857 error ("member %q+#D with copy assignment operator "
3858 "not allowed in anonymous aggregate", field);
3864 /* Make sure that a declaration with no declarator is well-formed, i.e.
3865 just declares a tagged type or anonymous union.
3867 Returns the type declared; or NULL_TREE if none. */
3870 check_tag_decl (cp_decl_specifier_seq *declspecs)
3872 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3873 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3874 /* If a class, struct, or enum type is declared by the DECLSPECS
3875 (i.e, if a class-specifier, enum-specifier, or non-typename
3876 elaborated-type-specifier appears in the DECLSPECS),
3877 DECLARED_TYPE is set to the corresponding type. */
3878 tree declared_type = NULL_TREE;
3879 bool error_p = false;
3881 if (declspecs->multiple_types_p)
3882 error ("multiple types in one declaration");
3883 else if (declspecs->redefined_builtin_type)
3885 if (!in_system_header)
3886 permerror (input_location, "redeclaration of C++ built-in type %qT",
3887 declspecs->redefined_builtin_type);
3892 && TYPE_P (declspecs->type)
3893 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3894 && MAYBE_CLASS_TYPE_P (declspecs->type))
3895 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3896 declared_type = declspecs->type;
3897 else if (declspecs->type == error_mark_node)
3899 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3900 permerror (input_location, "declaration does not declare anything");
3901 /* Check for an anonymous union. */
3902 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3903 && TYPE_ANONYMOUS_P (declared_type))
3905 /* 7/3 In a simple-declaration, the optional init-declarator-list
3906 can be omitted only when declaring a class (clause 9) or
3907 enumeration (7.2), that is, when the decl-specifier-seq contains
3908 either a class-specifier, an elaborated-type-specifier with
3909 a class-key (9.1), or an enum-specifier. In these cases and
3910 whenever a class-specifier or enum-specifier is present in the
3911 decl-specifier-seq, the identifiers in these specifiers are among
3912 the names being declared by the declaration (as class-name,
3913 enum-names, or enumerators, depending on the syntax). In such
3914 cases, and except for the declaration of an unnamed bit-field (9.6),
3915 the decl-specifier-seq shall introduce one or more names into the
3916 program, or shall redeclare a name introduced by a previous
3917 declaration. [Example:
3918 enum { }; // ill-formed
3919 typedef class { }; // ill-formed
3923 error ("missing type-name in typedef-declaration");
3926 /* Anonymous unions are objects, so they can have specifiers. */;
3927 SET_ANON_AGGR_TYPE_P (declared_type);
3929 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3930 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3935 if (declspecs->specs[(int)ds_inline]
3936 || declspecs->specs[(int)ds_virtual])
3937 error ("%qs can only be specified for functions",
3938 declspecs->specs[(int)ds_inline]
3939 ? "inline" : "virtual");
3941 && (!current_class_type
3942 || current_scope () != current_class_type))
3943 error ("%<friend%> can only be specified inside a class");
3944 else if (declspecs->specs[(int)ds_explicit])
3945 error ("%<explicit%> can only be specified for constructors");
3946 else if (declspecs->storage_class)
3947 error ("a storage class can only be specified for objects "
3949 else if (declspecs->specs[(int)ds_const]
3950 || declspecs->specs[(int)ds_volatile]
3951 || declspecs->specs[(int)ds_restrict]
3952 || declspecs->specs[(int)ds_thread])
3953 error ("qualifiers can only be specified for objects "
3955 else if (saw_typedef)
3956 warning (0, "%<typedef%> was ignored in this declaration");
3957 else if (declspecs->specs[(int) ds_constexpr])
3958 error ("%<constexpr> cannot be used for type declarations");
3961 return declared_type;
3964 /* Called when a declaration is seen that contains no names to declare.
3965 If its type is a reference to a structure, union or enum inherited
3966 from a containing scope, shadow that tag name for the current scope
3967 with a forward reference.
3968 If its type defines a new named structure or union
3969 or defines an enum, it is valid but we need not do anything here.
3970 Otherwise, it is an error.
3972 C++: may have to grok the declspecs to learn about static,
3973 complain for anonymous unions.
3975 Returns the TYPE declared -- or NULL_TREE if none. */
3978 shadow_tag (cp_decl_specifier_seq *declspecs)
3980 tree t = check_tag_decl (declspecs);
3985 if (declspecs->attributes)
3987 warning (0, "attribute ignored in declaration of %q+#T", t);
3988 warning (0, "attribute for %q+#T must follow the %qs keyword",
3989 t, class_key_or_enum_as_string (t));
3993 if (maybe_process_partial_specialization (t) == error_mark_node)
3996 /* This is where the variables in an anonymous union are
3997 declared. An anonymous union declaration looks like:
3999 because there is no declarator after the union, the parser
4000 sends that declaration here. */
4001 if (ANON_AGGR_TYPE_P (t))
4003 fixup_anonymous_aggr (t);
4005 if (TYPE_FIELDS (t))
4007 tree decl = grokdeclarator (/*declarator=*/NULL,
4008 declspecs, NORMAL, 0, NULL);
4009 finish_anon_union (decl);
4016 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
4019 groktypename (cp_decl_specifier_seq *type_specifiers,
4020 const cp_declarator *declarator,
4021 bool is_template_arg)
4025 enum decl_context context
4026 = is_template_arg ? TEMPLATE_TYPE_ARG : TYPENAME;
4027 attrs = type_specifiers->attributes;
4028 type_specifiers->attributes = NULL_TREE;
4029 type = grokdeclarator (declarator, type_specifiers, context, 0, &attrs);
4030 if (attrs && type != error_mark_node)
4032 if (CLASS_TYPE_P (type))
4033 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
4034 "outside of definition", type);
4035 else if (MAYBE_CLASS_TYPE_P (type))
4036 /* A template type parameter or other dependent type. */
4037 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
4038 "type %qT without an associated declaration", type);
4040 cplus_decl_attributes (&type, attrs, 0);
4045 /* Process a DECLARATOR for a function-scope variable declaration,
4046 namespace-scope variable declaration, or function declaration.
4047 (Function definitions go through start_function; class member
4048 declarations appearing in the body of the class go through
4049 grokfield.) The DECL corresponding to the DECLARATOR is returned.
4050 If an error occurs, the error_mark_node is returned instead.
4052 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
4053 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
4054 for an explicitly defaulted function, or SD_DELETED for an explicitly
4055 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
4056 implicitly initialized via a default constructor. ATTRIBUTES and
4057 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
4058 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
4059 set, the caller is responsible for calling pop_scope. */
4062 start_decl (const cp_declarator *declarator,
4063 cp_decl_specifier_seq *declspecs,
4066 tree prefix_attributes,
4067 tree *pushed_scope_p)
4074 *pushed_scope_p = NULL_TREE;
4076 /* An object declared as __attribute__((deprecated)) suppresses
4077 warnings of uses of other deprecated items. */
4078 if (lookup_attribute ("deprecated", attributes))
4079 deprecated_state = DEPRECATED_SUPPRESS;
4081 attributes = chainon (attributes, prefix_attributes);
4083 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4086 deprecated_state = DEPRECATED_NORMAL;
4088 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4089 || decl == error_mark_node)
4090 return error_mark_node;
4092 context = DECL_CONTEXT (decl);
4096 *pushed_scope_p = push_scope (context);
4098 /* We are only interested in class contexts, later. */
4099 if (TREE_CODE (context) == NAMESPACE_DECL)
4100 context = NULL_TREE;
4104 /* Is it valid for this decl to have an initializer at all?
4105 If not, set INITIALIZED to zero, which will indirectly
4106 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4107 switch (TREE_CODE (decl))
4110 error ("typedef %qD is initialized (use decltype instead)", decl);
4111 return error_mark_node;
4114 if (initialized == SD_DELETED)
4115 /* We'll handle the rest of the semantics later, but we need to
4116 set this now so it's visible to duplicate_decls. */
4117 DECL_DELETED_FN (decl) = 1;
4126 if (! toplevel_bindings_p ()
4127 && DECL_EXTERNAL (decl))
4128 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4130 DECL_EXTERNAL (decl) = 0;
4131 if (toplevel_bindings_p ())
4132 TREE_STATIC (decl) = 1;
4135 /* If this is a typedef that names the class for linkage purposes
4136 (7.1.3p8), apply any attributes directly to the type. */
4137 if (TREE_CODE (decl) == TYPE_DECL
4138 && TAGGED_TYPE_P (TREE_TYPE (decl))
4139 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4140 flags = ATTR_FLAG_TYPE_IN_PLACE;
4144 /* Set attributes here so if duplicate decl, will have proper attributes. */
4145 cplus_decl_attributes (&decl, attributes, flags);
4147 /* Dllimported symbols cannot be defined. Static data members (which
4148 can be initialized in-class and dllimported) go through grokfield,
4149 not here, so we don't need to exclude those decls when checking for
4151 if (initialized && DECL_DLLIMPORT_P (decl))
4153 error ("definition of %q#D is marked %<dllimport%>", decl);
4154 DECL_DLLIMPORT_P (decl) = 0;
4157 /* If #pragma weak was used, mark the decl weak now. */
4158 maybe_apply_pragma_weak (decl);
4160 if (TREE_CODE (decl) == FUNCTION_DECL
4161 && DECL_DECLARED_INLINE_P (decl)
4162 && DECL_UNINLINABLE (decl)
4163 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4164 warning (0, "inline function %q+D given attribute noinline", decl);
4166 if (context && COMPLETE_TYPE_P (complete_type (context)))
4168 if (TREE_CODE (decl) == VAR_DECL)
4170 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4171 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4172 error ("%q#D is not a static member of %q#T", decl, context);
4175 if (DECL_CONTEXT (field) != context)
4177 if (!same_type_p (DECL_CONTEXT (field), context))
4178 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4179 "to be defined as %<%T::%D%>",
4180 DECL_CONTEXT (field), DECL_NAME (decl),
4181 context, DECL_NAME (decl));
4182 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4184 if (processing_specialization
4185 && template_class_depth (context) == 0
4186 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4187 error ("template header not allowed in member definition "
4188 "of explicitly specialized class");
4189 /* Static data member are tricky; an in-class initialization
4190 still doesn't provide a definition, so the in-class
4191 declaration will have DECL_EXTERNAL set, but will have an
4192 initialization. Thus, duplicate_decls won't warn
4193 about this situation, and so we check here. */
4194 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4195 error ("duplicate initialization of %qD", decl);
4196 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4198 if (declspecs->specs[(int) ds_constexpr]
4199 && !DECL_DECLARED_CONSTEXPR_P (field))
4200 error ("%qD declared %<constexpr%> outside its class", field);
4205 tree field = check_classfn (context, decl,
4206 (processing_template_decl
4207 > template_class_depth (context))
4208 ? current_template_parms
4210 if (field && field != error_mark_node
4211 && duplicate_decls (decl, field,
4212 /*newdecl_is_friend=*/false))
4216 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4217 DECL_IN_AGGR_P (decl) = 0;
4218 /* Do not mark DECL as an explicit specialization if it was not
4219 already marked as an instantiation; a declaration should
4220 never be marked as a specialization unless we know what
4221 template is being specialized. */
4222 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4224 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4226 /* [temp.expl.spec] An explicit specialization of a static data
4227 member of a template is a definition if the declaration
4228 includes an initializer; otherwise, it is a declaration.
4230 We check for processing_specialization so this only applies
4231 to the new specialization syntax. */
4232 if (!initialized && processing_specialization)
4233 DECL_EXTERNAL (decl) = 1;
4236 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4237 permerror (input_location, "declaration of %q#D outside of class is not definition",
4240 if (!ensure_literal_type_for_constexpr_object (decl))
4241 return error_mark_node;
4244 was_public = TREE_PUBLIC (decl);
4246 /* Enter this declaration into the symbol table. */
4247 decl = maybe_push_decl (decl);
4249 if (processing_template_decl)
4250 decl = push_template_decl (decl);
4251 if (decl == error_mark_node)
4252 return error_mark_node;
4254 /* Tell the back end to use or not use .common as appropriate. If we say
4255 -fconserve-space, we want this to save .data space, at the expense of
4256 wrong semantics. If we say -fno-conserve-space, we want this to
4257 produce errors about redefs; to do this we force variables into the
4259 if (flag_conserve_space
4260 && TREE_CODE (decl) == VAR_DECL
4261 && TREE_PUBLIC (decl)
4262 && !DECL_THREAD_LOCAL_P (decl)
4263 && !have_global_bss_p ())
4264 DECL_COMMON (decl) = 1;
4266 if (TREE_CODE (decl) == VAR_DECL
4267 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4268 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4270 /* This is a const variable with implicit 'static'. Set
4271 DECL_THIS_STATIC so we can tell it from variables that are
4272 !TREE_PUBLIC because of the anonymous namespace. */
4273 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4274 DECL_THIS_STATIC (decl) = 1;
4277 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4278 start_decl_1 (decl, initialized);
4283 /* Process the declaration of a variable DECL. INITIALIZED is true
4284 iff DECL is explicitly initialized. (INITIALIZED is false if the
4285 variable is initialized via an implicitly-called constructor.)
4286 This function must be called for ordinary variables (including, for
4287 example, implicit instantiations of templates), but must not be
4288 called for template declarations. */
4291 start_decl_1 (tree decl, bool initialized)
4295 bool aggregate_definition_p;
4297 gcc_assert (!processing_template_decl);
4299 if (error_operand_p (decl))
4302 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4304 type = TREE_TYPE (decl);
4305 complete_p = COMPLETE_TYPE_P (type);
4306 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4308 /* If an explicit initializer is present, or if this is a definition
4309 of an aggregate, then we need a complete type at this point.
4310 (Scalars are always complete types, so there is nothing to
4311 check.) This code just sets COMPLETE_P; errors (if necessary)
4312 are issued below. */
4313 if ((initialized || aggregate_definition_p)
4315 && COMPLETE_TYPE_P (complete_type (type)))
4318 /* We will not yet have set TREE_READONLY on DECL if the type
4319 was "const", but incomplete, before this point. But, now, we
4320 have a complete type, so we can try again. */
4321 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4325 /* Is it valid for this decl to have an initializer at all? */
4327 /* Don't allow initializations for incomplete types except for
4328 arrays which might be completed by the initialization. */
4330 ; /* A complete type is ok. */
4331 else if (type_uses_auto (type))
4332 ; /* An auto type is ok. */
4333 else if (TREE_CODE (type) != ARRAY_TYPE)
4335 error ("variable %q#D has initializer but incomplete type", decl);
4336 type = TREE_TYPE (decl) = error_mark_node;
4338 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4340 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4341 error ("elements of array %q#D have incomplete type", decl);
4342 /* else we already gave an error in start_decl. */
4345 else if (aggregate_definition_p && !complete_p)
4347 if (type_uses_auto (type))
4348 error ("declaration of %q#D has no initializer", decl);
4350 error ("aggregate %q#D has incomplete type and cannot be defined",
4352 /* Change the type so that assemble_variable will give
4353 DECL an rtl we can live with: (mem (const_int 0)). */
4354 type = TREE_TYPE (decl) = error_mark_node;
4357 /* Create a new scope to hold this declaration if necessary.
4358 Whether or not a new scope is necessary cannot be determined
4359 until after the type has been completed; if the type is a
4360 specialization of a class template it is not until after
4361 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4362 will be set correctly. */
4363 maybe_push_cleanup_level (type);
4366 /* Handle initialization of references. DECL, TYPE, and INIT have the
4367 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4368 but will be set to a new CLEANUP_STMT if a temporary is created
4369 that must be destroyed subsequently.
4371 Returns an initializer expression to use to initialize DECL, or
4372 NULL if the initialization can be performed statically.
4374 Quotes on semantics can be found in ARM 8.4.3. */
4377 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4381 if (init == NULL_TREE)
4383 if ((DECL_LANG_SPECIFIC (decl) == 0
4384 || DECL_IN_AGGR_P (decl) == 0)
4385 && ! DECL_THIS_EXTERN (decl))
4386 error ("%qD declared as reference but not initialized", decl);
4390 if (TREE_CODE (init) == TREE_LIST)
4391 init = build_x_compound_expr_from_list (init, "initializer");
4393 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4394 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4395 /* Note: default conversion is only called in very special cases. */
4396 init = decay_conversion (init);
4398 /* Convert INIT to the reference type TYPE. This may involve the
4399 creation of a temporary, whose lifetime must be the same as that
4400 of the reference. If so, a DECL_EXPR for the temporary will be
4401 added just after the DECL_EXPR for DECL. That's why we don't set
4402 DECL_INITIAL for local references (instead assigning to them
4403 explicitly); we need to allow the temporary to be initialized
4405 tmp = initialize_reference (type, init, decl, cleanup, tf_warning_or_error);
4407 if (tmp == error_mark_node)
4409 else if (tmp == NULL_TREE)
4411 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4415 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4418 DECL_INITIAL (decl) = tmp;
4423 /* Subroutine of check_initializer. We're initializing a DECL of
4424 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4425 extend the lifetime of the underlying array to match that of the decl,
4426 just like for reference initialization. CLEANUP is as for
4427 grok_reference_init. */
4430 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4432 tree aggr_init, array, arrtype;
4433 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4434 if (error_operand_p (init))
4435 return error_mark_node;
4437 aggr_init = TARGET_EXPR_INITIAL (init);
4438 init = build2 (INIT_EXPR, type, decl, init);
4440 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4441 arrtype = TREE_TYPE (array);
4443 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4444 array = TREE_OPERAND (array, 0);
4445 /* If the array is constant, finish_compound_literal already made it a
4446 static variable and we don't need to do anything here. */
4447 if (decl && TREE_CODE (array) == TARGET_EXPR)
4450 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4451 var = build_address (var);
4452 var = convert (arrtype, var);
4453 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4454 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4459 /* Designated initializers in arrays are not supported in GNU C++.
4460 The parser cannot detect this error since it does not know whether
4461 a given brace-enclosed initializer is for a class type or for an
4462 array. This function checks that CE does not use a designated
4463 initializer. If it does, an error is issued. Returns true if CE
4464 is valid, i.e., does not have a designated initializer. */
4467 check_array_designated_initializer (const constructor_elt *ce)
4469 /* Designated initializers for array elements are not supported. */
4472 /* The parser only allows identifiers as designated
4474 if (ce->index == error_mark_node)
4475 error ("name used in a GNU-style designated "
4476 "initializer for an array");
4479 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4480 error ("name %qD used in a GNU-style designated "
4481 "initializer for an array", ce->index);
4489 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4490 array until we finish parsing the initializer. If that's the
4491 situation we're in, update DECL accordingly. */
4494 maybe_deduce_size_from_array_init (tree decl, tree init)
4496 tree type = TREE_TYPE (decl);
4498 if (TREE_CODE (type) == ARRAY_TYPE
4499 && TYPE_DOMAIN (type) == NULL_TREE
4500 && TREE_CODE (decl) != TYPE_DECL)
4502 /* do_default is really a C-ism to deal with tentative definitions.
4503 But let's leave it here to ease the eventual merge. */
4504 int do_default = !DECL_EXTERNAL (decl);
4505 tree initializer = init ? init : DECL_INITIAL (decl);
4508 /* Check that there are no designated initializers in INIT, as
4509 those are not supported in GNU C++, and as the middle-end
4510 will crash if presented with a non-numeric designated
4512 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4514 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4515 constructor_elt *ce;
4518 VEC_iterate (constructor_elt, v, i, ce);
4520 if (!check_array_designated_initializer (ce))
4526 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4530 error ("initializer fails to determine size of %qD", decl);
4531 TREE_TYPE (decl) = error_mark_node;
4533 else if (failure == 2)
4537 error ("array size missing in %qD", decl);
4538 TREE_TYPE (decl) = error_mark_node;
4540 /* If a `static' var's size isn't known, make it extern as
4541 well as static, so it does not get allocated. If it's not
4542 `static', then don't mark it extern; finish_incomplete_decl
4543 will give it a default size and it will get allocated. */
4544 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4545 DECL_EXTERNAL (decl) = 1;
4547 else if (failure == 3)
4549 error ("zero-size array %qD", decl);
4550 TREE_TYPE (decl) = error_mark_node;
4554 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4556 relayout_decl (decl);
4560 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4561 any appropriate error messages regarding the layout. */
4564 layout_var_decl (tree decl)
4568 type = TREE_TYPE (decl);
4569 if (type == error_mark_node)
4572 /* If we haven't already layed out this declaration, do so now.
4573 Note that we must not call complete type for an external object
4574 because it's type might involve templates that we are not
4575 supposed to instantiate yet. (And it's perfectly valid to say
4576 `extern X x' for some incomplete type `X'.) */
4577 if (!DECL_EXTERNAL (decl))
4578 complete_type (type);
4579 if (!DECL_SIZE (decl)
4580 && TREE_TYPE (decl) != error_mark_node
4581 && (COMPLETE_TYPE_P (type)
4582 || (TREE_CODE (type) == ARRAY_TYPE
4583 && !TYPE_DOMAIN (type)
4584 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4585 layout_decl (decl, 0);
4587 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4589 /* An automatic variable with an incomplete type: that is an error.
4590 Don't talk about array types here, since we took care of that
4591 message in grokdeclarator. */
4592 error ("storage size of %qD isn't known", decl);
4593 TREE_TYPE (decl) = error_mark_node;
4596 /* Keep this code around in case we later want to control debug info
4597 based on whether a type is "used". (jason 1999-11-11) */
4599 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4600 /* Let debugger know it should output info for this type. */
4601 note_debug_info_needed (ttype);
4603 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4604 note_debug_info_needed (DECL_CONTEXT (decl));
4607 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4608 && DECL_SIZE (decl) != NULL_TREE
4609 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4611 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4612 constant_expression_warning (DECL_SIZE (decl));
4615 error ("storage size of %qD isn't constant", decl);
4616 TREE_TYPE (decl) = error_mark_node;
4621 /* If a local static variable is declared in an inline function, or if
4622 we have a weak definition, we must endeavor to create only one
4623 instance of the variable at link-time. */
4626 maybe_commonize_var (tree decl)
4628 /* Static data in a function with comdat linkage also has comdat
4630 if (TREE_STATIC (decl)
4631 /* Don't mess with __FUNCTION__. */
4632 && ! DECL_ARTIFICIAL (decl)
4633 && DECL_FUNCTION_SCOPE_P (decl)
4634 && vague_linkage_fn_p (DECL_CONTEXT (decl)))
4638 /* With weak symbols, we simply make the variable COMDAT;
4639 that will cause copies in multiple translations units to
4641 comdat_linkage (decl);
4645 if (DECL_INITIAL (decl) == NULL_TREE
4646 || DECL_INITIAL (decl) == error_mark_node)
4648 /* Without weak symbols, we can use COMMON to merge
4649 uninitialized variables. */
4650 TREE_PUBLIC (decl) = 1;
4651 DECL_COMMON (decl) = 1;
4655 /* While for initialized variables, we must use internal
4656 linkage -- which means that multiple copies will not
4658 TREE_PUBLIC (decl) = 0;
4659 DECL_COMMON (decl) = 0;
4660 warning_at (input_location, 0,
4661 "sorry: semantics of inline function static "
4662 "data %q+#D are wrong (you'll wind up "
4663 "with multiple copies)", decl);
4664 warning_at (DECL_SOURCE_LOCATION (decl), 0,
4665 " you can work around this by removing "
4670 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4671 /* Set it up again; we might have set DECL_INITIAL since the last
4673 comdat_linkage (decl);
4676 /* Issue an error message if DECL is an uninitialized const variable. */
4679 check_for_uninitialized_const_var (tree decl)
4681 tree type = TREE_TYPE (decl);
4683 if (TREE_CODE (decl) == VAR_DECL && DECL_DECLARED_CONSTEXPR_P (decl)
4684 && DECL_INITIAL (decl) == NULL)
4685 error ("missing initializer for constexpr %qD", decl);
4687 /* ``Unless explicitly declared extern, a const object does not have
4688 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4690 else if (TREE_CODE (decl) == VAR_DECL
4691 && TREE_CODE (type) != REFERENCE_TYPE
4692 && CP_TYPE_CONST_P (type)
4693 && !TYPE_NEEDS_CONSTRUCTING (type)
4694 && !DECL_INITIAL (decl))
4695 error ("uninitialized const %qD", decl);
4699 /* Structure holding the current initializer being processed by reshape_init.
4700 CUR is a pointer to the current element being processed, END is a pointer
4701 after the last element present in the initializer. */
4702 typedef struct reshape_iterator_t
4704 constructor_elt *cur;
4705 constructor_elt *end;
4708 static tree reshape_init_r (tree, reshape_iter *, bool);
4710 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4711 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4712 initialized. If there are no more such fields, the return value
4716 next_initializable_field (tree field)
4719 && (TREE_CODE (field) != FIELD_DECL
4720 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4721 || DECL_ARTIFICIAL (field)))
4722 field = TREE_CHAIN (field);
4727 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4728 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4729 INTEGER_CST representing the size of the array minus one (the maximum index),
4730 or NULL_TREE if the array was declared without specifying the size. D is
4731 the iterator within the constructor. */
4734 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4737 bool sized_array_p = (max_index != NULL_TREE);
4738 unsigned HOST_WIDE_INT max_index_cst = 0;
4739 unsigned HOST_WIDE_INT index;
4741 /* The initializer for an array is always a CONSTRUCTOR. */
4742 new_init = build_constructor (init_list_type_node, NULL);
4746 /* Minus 1 is used for zero sized arrays. */
4747 if (integer_all_onesp (max_index))
4750 if (host_integerp (max_index, 1))
4751 max_index_cst = tree_low_cst (max_index, 1);
4752 /* sizetype is sign extended, not zero extended. */
4754 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4758 /* Loop until there are no more initializers. */
4760 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4765 check_array_designated_initializer (d->cur);
4766 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4767 if (elt_init == error_mark_node)
4768 return error_mark_node;
4769 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4775 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4776 Parameters are the same of reshape_init_r. */
4779 reshape_init_array (tree type, reshape_iter *d)
4781 tree max_index = NULL_TREE;
4783 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4785 if (TYPE_DOMAIN (type))
4786 max_index = array_type_nelts (type);
4788 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4791 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4792 Parameters are the same of reshape_init_r. */
4795 reshape_init_vector (tree type, reshape_iter *d)
4797 tree max_index = NULL_TREE;
4800 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4802 if (COMPOUND_LITERAL_P (d->cur->value))
4804 tree value = d->cur->value;
4805 if (!same_type_p (TREE_TYPE (value), type))
4807 error ("invalid type %qT as initializer for a vector of type %qT",
4808 TREE_TYPE (d->cur->value), type);
4809 value = error_mark_node;
4815 /* For a vector, the representation type is a struct
4816 containing a single member which is an array of the
4817 appropriate size. */
4818 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4819 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4820 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4822 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4825 /* Subroutine of reshape_init_r, processes the initializers for classes
4826 or union. Parameters are the same of reshape_init_r. */
4829 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4834 gcc_assert (CLASS_TYPE_P (type));
4836 /* The initializer for a class is always a CONSTRUCTOR. */
4837 new_init = build_constructor (init_list_type_node, NULL);
4838 field = next_initializable_field (TYPE_FIELDS (type));
4844 An initializer for an aggregate member that is an
4845 empty class shall have the form of an empty
4846 initializer-list {}. */
4847 if (!first_initializer_p)
4849 error ("initializer for %qT must be brace-enclosed", type);
4850 return error_mark_node;
4855 /* Loop through the initializable fields, gathering initializers. */
4856 while (d->cur != d->end)
4860 /* Handle designated initializers, as an extension. */
4863 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4865 if (!field || TREE_CODE (field) != FIELD_DECL)
4867 error ("%qT has no non-static data member named %qD", type,
4869 return error_mark_node;
4873 /* If we processed all the member of the class, we are done. */
4877 field_init = reshape_init_r (TREE_TYPE (field), d,
4878 /*first_initializer_p=*/false);
4879 if (field_init == error_mark_node)
4880 return error_mark_node;
4882 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4886 When a union is initialized with a brace-enclosed
4887 initializer, the braces shall only contain an
4888 initializer for the first member of the union. */
4889 if (TREE_CODE (type) == UNION_TYPE)
4892 field = next_initializable_field (TREE_CHAIN (field));
4898 /* Subroutine of reshape_init, which processes a single initializer (part of
4899 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4900 iterator within the CONSTRUCTOR which points to the initializer to process.
4901 FIRST_INITIALIZER_P is true if this is the first initializer of the
4902 outermost CONSTRUCTOR node. */
4905 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4907 tree init = d->cur->value;
4909 if (error_operand_p (init))
4910 return error_mark_node;
4912 /* A non-aggregate type is always initialized with a single
4914 if (!CP_AGGREGATE_TYPE_P (type))
4916 /* It is invalid to initialize a non-aggregate type with a
4917 brace-enclosed initializer before C++0x.
4918 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4919 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4920 a CONSTRUCTOR (with a record type). */
4921 if (TREE_CODE (init) == CONSTRUCTOR
4922 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4924 if (SCALAR_TYPE_P (type))
4926 error ("braces around scalar initializer for type %qT", type);
4927 init = error_mark_node;
4930 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
4939 All implicit type conversions (clause _conv_) are considered when
4940 initializing the aggregate member with an initializer from an
4941 initializer-list. If the initializer can initialize a member,
4942 the member is initialized. Otherwise, if the member is itself a
4943 non-empty subaggregate, brace elision is assumed and the
4944 initializer is considered for the initialization of the first
4945 member of the subaggregate. */
4946 if (TREE_CODE (init) != CONSTRUCTOR
4947 /* But don't try this for the first initializer, since that would be
4948 looking through the outermost braces; A a2 = { a1 }; is not a
4949 valid aggregate initialization. */
4950 && !first_initializer_p
4951 && (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (init))
4952 || can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL)))
4958 /* [dcl.init.string]
4960 A char array (whether plain char, signed char, or unsigned char)
4961 can be initialized by a string-literal (optionally enclosed in
4962 braces); a wchar_t array can be initialized by a wide
4963 string-literal (optionally enclosed in braces). */
4964 if (TREE_CODE (type) == ARRAY_TYPE
4965 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4967 tree str_init = init;
4969 /* Strip one level of braces if and only if they enclose a single
4970 element (as allowed by [dcl.init.string]). */
4971 if (!first_initializer_p
4972 && TREE_CODE (str_init) == CONSTRUCTOR
4973 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4975 str_init = VEC_index (constructor_elt,
4976 CONSTRUCTOR_ELTS (str_init), 0)->value;
4979 /* If it's a string literal, then it's the initializer for the array
4980 as a whole. Otherwise, continue with normal initialization for
4981 array types (one value per array element). */
4982 if (TREE_CODE (str_init) == STRING_CST)
4989 /* The following cases are about aggregates. If we are not within a full
4990 initializer already, and there is not a CONSTRUCTOR, it means that there
4991 is a missing set of braces (that is, we are processing the case for
4992 which reshape_init exists). */
4993 if (!first_initializer_p)
4995 if (TREE_CODE (init) == CONSTRUCTOR)
4997 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4998 /* There is no need to reshape pointer-to-member function
4999 initializers, as they are always constructed correctly
5000 by the front end. */
5002 else if (COMPOUND_LITERAL_P (init))
5003 /* For a nested compound literal, there is no need to reshape since
5004 brace elision is not allowed. Even if we decided to allow it,
5005 we should add a call to reshape_init in finish_compound_literal,
5006 before calling digest_init, so changing this code would still
5007 not be necessary. */
5008 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
5012 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5013 return reshape_init (type, init);
5017 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
5021 /* Dispatch to specialized routines. */
5022 if (CLASS_TYPE_P (type))
5023 return reshape_init_class (type, d, first_initializer_p);
5024 else if (TREE_CODE (type) == ARRAY_TYPE)
5025 return reshape_init_array (type, d);
5026 else if (TREE_CODE (type) == VECTOR_TYPE)
5027 return reshape_init_vector (type, d);
5032 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
5033 brace-enclosed aggregate initializer.
5035 INIT is the CONSTRUCTOR containing the list of initializers describing
5036 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
5037 It may not presently match the shape of the TYPE; for example:
5039 struct S { int a; int b; };
5040 struct S a[] = { 1, 2, 3, 4 };
5042 Here INIT will hold a VEC of four elements, rather than a
5043 VEC of two elements, each itself a VEC of two elements. This
5044 routine transforms INIT from the former form into the latter. The
5045 revised CONSTRUCTOR node is returned. */
5048 reshape_init (tree type, tree init)
5050 VEC(constructor_elt, gc) *v;
5054 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
5056 v = CONSTRUCTOR_ELTS (init);
5058 /* An empty constructor does not need reshaping, and it is always a valid
5060 if (VEC_empty (constructor_elt, v))
5063 /* Recurse on this CONSTRUCTOR. */
5064 d.cur = VEC_index (constructor_elt, v, 0);
5065 d.end = d.cur + VEC_length (constructor_elt, v);
5067 new_init = reshape_init_r (type, &d, true);
5068 if (new_init == error_mark_node)
5069 return error_mark_node;
5071 /* Make sure all the element of the constructor were used. Otherwise,
5072 issue an error about exceeding initializers. */
5074 error ("too many initializers for %qT", type);
5079 /* Verify array initializer. Returns true if errors have been reported. */
5082 check_array_initializer (tree decl, tree type, tree init)
5084 tree element_type = TREE_TYPE (type);
5086 /* The array type itself need not be complete, because the
5087 initializer may tell us how many elements are in the array.
5088 But, the elements of the array must be complete. */
5089 if (!COMPLETE_TYPE_P (complete_type (element_type)))
5092 error ("elements of array %q#D have incomplete type", decl);
5094 error ("elements of array %q#T have incomplete type", type);
5097 /* It is not valid to initialize a VLA. */
5099 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5100 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5103 error ("variable-sized object %qD may not be initialized", decl);
5105 error ("variable-sized compound literal");
5111 /* Subroutine of check_initializer; args are passed down from that function.
5112 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5115 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5118 int saved_stmts_are_full_exprs_p = 0;
5119 if (building_stmt_tree ())
5121 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5122 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5124 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5125 if (building_stmt_tree ())
5126 current_stmt_tree ()->stmts_are_full_exprs_p =
5127 saved_stmts_are_full_exprs_p;
5131 /* Verify INIT (the initializer for DECL), and record the
5132 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5133 grok_reference_init.
5135 If the return value is non-NULL, it is an expression that must be
5136 evaluated dynamically to initialize DECL. */
5139 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5141 tree type = TREE_TYPE (decl);
5142 tree init_code = NULL;
5144 /* Things that are going to be initialized need to have complete
5146 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5148 if (type == error_mark_node)
5149 /* We will have already complained. */
5152 if (TREE_CODE (type) == ARRAY_TYPE)
5154 if (check_array_initializer (decl, type, init))
5157 else if (!COMPLETE_TYPE_P (type))
5159 error ("%qD has incomplete type", decl);
5160 TREE_TYPE (decl) = error_mark_node;
5164 /* There is no way to make a variable-sized class type in GNU C++. */
5165 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5167 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5169 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5170 if (SCALAR_TYPE_P (type))
5174 maybe_warn_cpp0x (CPP0X_INITIALIZER_LISTS);
5175 init = build_zero_init (type, NULL_TREE, false);
5177 else if (init_len != 1)
5179 error ("scalar object %qD requires one element in initializer",
5181 TREE_TYPE (decl) = error_mark_node;
5187 if (TREE_CODE (decl) == CONST_DECL)
5189 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5191 DECL_INITIAL (decl) = init;
5193 gcc_assert (init != NULL_TREE);
5196 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5197 init = grok_reference_init (decl, type, init, cleanup);
5200 /* Do not reshape constructors of vectors (they don't need to be
5202 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5204 if (is_std_init_list (type))
5205 return build_init_list_var_init (decl, type, init, cleanup);
5206 else if (TYPE_NON_AGGREGATE_CLASS (type))
5208 /* Don't reshape if the class has constructors. */
5209 if (cxx_dialect == cxx98)
5210 error ("in C++98 %qD must be initialized by constructor, "
5213 init = build_tree_list (NULL_TREE, init);
5215 else if (TREE_CODE (type) == VECTOR_TYPE && TYPE_VECTOR_OPAQUE (type))
5217 error ("opaque vector types cannot be initialized");
5218 init = error_mark_node;
5221 init = reshape_init (type, init);
5224 /* If DECL has an array type without a specific bound, deduce the
5225 array size from the initializer. */
5226 maybe_deduce_size_from_array_init (decl, init);
5227 type = TREE_TYPE (decl);
5228 if (type == error_mark_node)
5231 if (TYPE_NEEDS_CONSTRUCTING (type)
5232 || (CLASS_TYPE_P (type)
5233 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5234 return build_aggr_init_full_exprs (decl, init, flags);
5235 else if (TREE_CODE (init) != TREE_VEC)
5237 init_code = store_init_value (decl, init, flags);
5238 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5239 && DECL_INITIAL (decl)
5240 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5241 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5242 warning (0, "array %qD initialized by parenthesized string literal %qE",
5243 decl, DECL_INITIAL (decl));
5247 else if (DECL_EXTERNAL (decl))
5249 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5250 return build_aggr_init_full_exprs (decl, init, flags);
5251 else if (MAYBE_CLASS_TYPE_P (type))
5253 tree core_type = strip_array_types (type);
5255 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5256 error ("structure %qD with uninitialized const members", decl);
5257 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5258 error ("structure %qD with uninitialized reference members", decl);
5260 check_for_uninitialized_const_var (decl);
5263 check_for_uninitialized_const_var (decl);
5265 if (init && init != error_mark_node)
5266 init_code = build2 (INIT_EXPR, type, decl, init);
5271 /* If DECL is not a local variable, give it RTL. */
5274 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5276 int toplev = toplevel_bindings_p ();
5278 const char *filename;
5280 /* Set the DECL_ASSEMBLER_NAME for the object. */
5283 /* The `register' keyword, when used together with an
5284 asm-specification, indicates that the variable should be
5285 placed in a particular register. */
5286 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5288 set_user_assembler_name (decl, asmspec);
5289 DECL_HARD_REGISTER (decl) = 1;
5293 if (TREE_CODE (decl) == FUNCTION_DECL
5294 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5295 set_builtin_user_assembler_name (decl, asmspec);
5296 set_user_assembler_name (decl, asmspec);
5300 /* Handle non-variables up front. */
5301 if (TREE_CODE (decl) != VAR_DECL)
5303 rest_of_decl_compilation (decl, toplev, at_eof);
5307 /* If we see a class member here, it should be a static data
5309 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5311 gcc_assert (TREE_STATIC (decl));
5312 /* An in-class declaration of a static data member should be
5313 external; it is only a declaration, and not a definition. */
5314 if (init == NULL_TREE)
5315 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5318 /* We don't create any RTL for local variables. */
5319 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5322 /* We defer emission of local statics until the corresponding
5323 DECL_EXPR is expanded. */
5324 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5326 /* We try to defer namespace-scope static constants so that they are
5327 not emitted into the object file unnecessarily. */
5328 filename = input_filename;
5329 if (!DECL_VIRTUAL_P (decl)
5330 && TREE_READONLY (decl)
5331 && DECL_INITIAL (decl) != NULL_TREE
5332 && DECL_INITIAL (decl) != error_mark_node
5334 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5336 && !TREE_PUBLIC (decl))
5338 /* Fool with the linkage of static consts according to #pragma
5340 struct c_fileinfo *finfo = get_fileinfo (filename);
5341 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5343 TREE_PUBLIC (decl) = 1;
5344 DECL_EXTERNAL (decl) = finfo->interface_only;
5349 /* Likewise for template instantiations. */
5350 else if (DECL_LANG_SPECIFIC (decl)
5351 && DECL_IMPLICIT_INSTANTIATION (decl))
5354 /* If we're not deferring, go ahead and assemble the variable. */
5356 rest_of_decl_compilation (decl, toplev, at_eof);
5359 /* walk_tree helper for wrap_temporary_cleanups, below. */
5362 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5364 if (TYPE_P (*stmt_p))
5370 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5372 tree guard = (tree)data;
5373 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5375 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5376 /* Tell honor_protect_cleanup_actions to handle this as a separate
5378 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5380 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5386 /* We're initializing a local variable which has a cleanup GUARD. If there
5387 are any temporaries used in the initializer INIT of this variable, we
5388 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5389 variable will be cleaned up properly if one of them throws.
5391 Unfortunately, there's no way to express this properly in terms of
5392 nesting, as the regions for the temporaries overlap the region for the
5393 variable itself; if there are two temporaries, the variable needs to be
5394 the first thing destroyed if either of them throws. However, we only
5395 want to run the variable's cleanup if it actually got constructed. So
5396 we need to guard the temporary cleanups with the variable's cleanup if
5397 they are run on the normal path, but not if they are run on the
5398 exceptional path. We implement this by telling
5399 honor_protect_cleanup_actions to strip the variable cleanup from the
5400 exceptional path. */
5403 wrap_temporary_cleanups (tree init, tree guard)
5405 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5408 /* Generate code to initialize DECL (a local variable). */
5411 initialize_local_var (tree decl, tree init)
5413 tree type = TREE_TYPE (decl);
5417 gcc_assert (TREE_CODE (decl) == VAR_DECL
5418 || TREE_CODE (decl) == RESULT_DECL);
5419 gcc_assert (!TREE_STATIC (decl));
5421 if (DECL_SIZE (decl) == NULL_TREE)
5423 /* If we used it already as memory, it must stay in memory. */
5424 DECL_INITIAL (decl) = NULL_TREE;
5425 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5429 if (type == error_mark_node)
5432 /* Compute and store the initial value. */
5433 already_used = TREE_USED (decl) || TREE_USED (type);
5435 /* Generate a cleanup, if necessary. */
5436 cleanup = cxx_maybe_build_cleanup (decl);
5438 /* Perform the initialization. */
5441 int saved_stmts_are_full_exprs_p;
5443 /* If we're only initializing a single object, guard the destructors
5444 of any temporaries used in its initializer with its destructor.
5445 This isn't right for arrays because each element initialization is
5446 a full-expression. */
5447 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5448 wrap_temporary_cleanups (init, cleanup);
5450 gcc_assert (building_stmt_tree ());
5451 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5452 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5453 finish_expr_stmt (init);
5454 current_stmt_tree ()->stmts_are_full_exprs_p =
5455 saved_stmts_are_full_exprs_p;
5458 /* Set this to 0 so we can tell whether an aggregate which was
5459 initialized was ever used. Don't do this if it has a
5460 destructor, so we don't complain about the 'resource
5461 allocation is initialization' idiom. Now set
5462 attribute((unused)) on types so decls of that type will be
5463 marked used. (see TREE_USED, above.) */
5464 if (TYPE_NEEDS_CONSTRUCTING (type)
5466 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5467 && DECL_NAME (decl))
5468 TREE_USED (decl) = 0;
5469 else if (already_used)
5470 TREE_USED (decl) = 1;
5473 finish_decl_cleanup (decl, cleanup);
5476 /* DECL is a VAR_DECL for a compiler-generated variable with static
5477 storage duration (like a virtual table) whose initializer is a
5478 compile-time constant. INIT must be either a TREE_LIST of values,
5479 or a CONSTRUCTOR. Initialize the variable and provide it to the
5483 initialize_artificial_var (tree decl, tree init)
5485 gcc_assert (DECL_ARTIFICIAL (decl));
5486 if (TREE_CODE (init) == TREE_LIST)
5487 init = build_constructor_from_list (TREE_TYPE (decl), init);
5488 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5489 DECL_INITIAL (decl) = init;
5490 DECL_INITIALIZED_P (decl) = 1;
5491 determine_visibility (decl);
5492 layout_var_decl (decl);
5493 maybe_commonize_var (decl);
5494 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5497 /* INIT is the initializer for a variable, as represented by the
5498 parser. Returns true iff INIT is value-dependent. */
5501 value_dependent_init_p (tree init)
5503 if (TREE_CODE (init) == TREE_LIST)
5504 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5505 return any_value_dependent_elements_p (init);
5506 else if (TREE_CODE (init) == CONSTRUCTOR)
5507 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5509 VEC(constructor_elt, gc) *elts;
5513 elts = CONSTRUCTOR_ELTS (init);
5514 nelts = VEC_length (constructor_elt, elts);
5515 for (i = 0; i < nelts; ++i)
5516 if (value_dependent_init_p (VEC_index (constructor_elt,
5521 /* It must be a simple expression, e.g., int i = 3; */
5522 return value_dependent_expression_p (init);
5527 /* Finish processing of a declaration;
5528 install its line number and initial value.
5529 If the length of an array type is not known before,
5530 it must be determined now, from the initial value, or it is an error.
5532 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5533 true, then INIT is an integral constant expression.
5535 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5536 if the (init) syntax was used. */
5539 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5540 tree asmspec_tree, int flags)
5544 const char *asmspec = NULL;
5545 int was_readonly = 0;
5546 bool var_definition_p = false;
5547 int saved_processing_template_decl;
5550 if (decl == error_mark_node)
5555 error ("assignment (not initialization) in declaration");
5559 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5560 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5561 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5563 type = TREE_TYPE (decl);
5564 if (type == error_mark_node)
5567 /* Assume no cleanup is required. */
5568 cleanup = NULL_TREE;
5569 saved_processing_template_decl = processing_template_decl;
5571 /* If a name was specified, get the string. */
5572 if (global_scope_p (current_binding_level))
5573 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5574 if (asmspec_tree && asmspec_tree != error_mark_node)
5575 asmspec = TREE_STRING_POINTER (asmspec_tree);
5577 if (current_class_type
5578 && CP_DECL_CONTEXT (decl) == current_class_type
5579 && TYPE_BEING_DEFINED (current_class_type)
5580 && (DECL_INITIAL (decl) || init))
5581 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5583 auto_node = type_uses_auto (type);
5586 if (init == NULL_TREE)
5588 error ("declaration of %q#D has no initializer", decl);
5589 TREE_TYPE (decl) = error_mark_node;
5592 if (TREE_CODE (init) == TREE_LIST)
5593 init = build_x_compound_expr_from_list (init, "initializer");
5594 if (describable_type (init))
5596 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5597 if (type == error_mark_node)
5602 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5605 if (init == ridpointers[(int)RID_DELETE])
5607 /* FIXME check this is 1st decl. */
5608 DECL_DELETED_FN (decl) = 1;
5609 DECL_DECLARED_INLINE_P (decl) = 1;
5610 DECL_INITIAL (decl) = error_mark_node;
5611 FOR_EACH_CLONE (clone, decl)
5613 DECL_DELETED_FN (clone) = 1;
5614 DECL_DECLARED_INLINE_P (clone) = 1;
5615 DECL_INITIAL (clone) = error_mark_node;
5619 else if (init == ridpointers[(int)RID_DEFAULT])
5621 if (defaultable_fn_check (decl))
5622 DECL_DEFAULTED_FN (decl) = 1;
5624 DECL_INITIAL (decl) = NULL_TREE;
5628 if (processing_template_decl)
5630 bool type_dependent_p;
5632 /* Add this declaration to the statement-tree. */
5633 if (at_function_scope_p ())
5634 add_decl_expr (decl);
5636 type_dependent_p = dependent_type_p (type);
5638 if (check_for_bare_parameter_packs (init))
5641 DECL_INITIAL (decl) = NULL_TREE;
5644 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5646 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5647 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5648 TREE_CONSTANT (decl) = 1;
5651 /* Generally, initializers in templates are expanded when the
5652 template is instantiated. But, if DECL is an integral
5653 constant static data member, then it can be used in future
5654 integral constant expressions, and its value must be
5657 && DECL_CLASS_SCOPE_P (decl)
5658 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5659 && !type_dependent_p
5660 && !value_dependent_init_p (init)))
5663 DECL_INITIAL (decl) = init;
5664 if (TREE_CODE (decl) == VAR_DECL
5665 && !DECL_PRETTY_FUNCTION_P (decl)
5666 && !type_dependent_p)
5667 maybe_deduce_size_from_array_init (decl, init);
5671 if (TREE_CODE (init) == TREE_LIST)
5673 /* If the parenthesized-initializer form was used (e.g.,
5674 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5675 arguments. (There is generally only one.) We convert them
5678 for (; list; list = TREE_CHAIN (list))
5680 tree elt = TREE_VALUE (list);
5681 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5685 init = fold_non_dependent_expr (init);
5686 processing_template_decl = 0;
5689 /* Take care of TYPE_DECLs up front. */
5690 if (TREE_CODE (decl) == TYPE_DECL)
5692 if (type != error_mark_node
5693 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5695 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5696 warning (0, "shadowing previous type declaration of %q#D", decl);
5697 set_identifier_type_value (DECL_NAME (decl), decl);
5700 /* If we have installed this as the canonical typedef for this
5701 type, and that type has not been defined yet, delay emitting
5702 the debug information for it, as we will emit it later. */
5703 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5704 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5705 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5707 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5712 /* A reference will be modified here, as it is initialized. */
5713 if (! DECL_EXTERNAL (decl)
5714 && TREE_READONLY (decl)
5715 && TREE_CODE (type) == REFERENCE_TYPE)
5718 TREE_READONLY (decl) = 0;
5721 if (TREE_CODE (decl) == VAR_DECL)
5723 /* Only variables with trivial initialization and destruction can
5724 have thread-local storage. */
5725 if (DECL_THREAD_LOCAL_P (decl)
5726 && (type_has_nontrivial_default_init (TREE_TYPE (decl))
5727 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl))))
5728 error ("%qD cannot be thread-local because it has non-trivial "
5729 "type %qT", decl, TREE_TYPE (decl));
5730 /* If this is a local variable that will need a mangled name,
5731 register it now. We must do this before processing the
5732 initializer for the variable, since the initialization might
5733 require a guard variable, and since the mangled name of the
5734 guard variable will depend on the mangled name of this
5736 if (DECL_FUNCTION_SCOPE_P (decl)
5737 && TREE_STATIC (decl)
5738 && !DECL_ARTIFICIAL (decl))
5739 push_local_name (decl);
5740 /* Convert the initializer to the type of DECL, if we have not
5741 already initialized DECL. */
5742 if (!DECL_INITIALIZED_P (decl)
5743 /* If !DECL_EXTERNAL then DECL is being defined. In the
5744 case of a static data member initialized inside the
5745 class-specifier, there can be an initializer even if DECL
5746 is *not* defined. */
5747 && (!DECL_EXTERNAL (decl) || init))
5749 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5752 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5753 /* Allow libjava/prims.cc define primitive classes. */
5754 if (init != NULL_TREE
5755 || jclass == NULL_TREE
5756 || TREE_CODE (jclass) != TYPE_DECL
5757 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5758 || !same_type_ignoring_top_level_qualifiers_p
5759 (type, TREE_TYPE (TREE_TYPE (jclass))))
5760 error ("Java object %qD not allocated with %<new%>", decl);
5765 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5766 if (init_const_expr_p)
5768 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5769 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5770 TREE_CONSTANT (decl) = 1;
5773 init = check_initializer (decl, init, flags, &cleanup);
5774 /* Thread-local storage cannot be dynamically initialized. */
5775 if (DECL_THREAD_LOCAL_P (decl) && init)
5777 error ("%qD is thread-local and so cannot be dynamically "
5778 "initialized", decl);
5782 /* Check that the initializer for a static data member was a
5783 constant. Although we check in the parser that the
5784 initializer is an integral constant expression, we do not
5785 simplify division-by-zero at the point at which it
5786 occurs. Therefore, in:
5788 struct S { static const int i = 7 / 0; };
5790 we issue an error at this point. It would
5791 probably be better to forbid division by zero in
5792 integral constant expressions. */
5793 if (DECL_EXTERNAL (decl) && init)
5795 error ("%qD cannot be initialized by a non-constant expression"
5796 " when being declared", decl);
5797 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5805 The memory occupied by any object of static storage
5806 duration is zero-initialized at program startup before
5807 any other initialization takes place.
5809 We cannot create an appropriate initializer until after
5810 the type of DECL is finalized. If DECL_INITIAL is set,
5811 then the DECL is statically initialized, and any
5812 necessary zero-initialization has already been performed. */
5813 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5814 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5815 /*nelts=*/NULL_TREE,
5816 /*static_storage_p=*/true);
5817 /* Remember that the initialization for this variable has
5819 DECL_INITIALIZED_P (decl) = 1;
5820 /* This declaration is the definition of this variable,
5821 unless we are initializing a static data member within
5822 the class specifier. */
5823 if (!DECL_EXTERNAL (decl))
5824 var_definition_p = true;
5826 /* If the variable has an array type, lay out the type, even if
5827 there is no initializer. It is valid to index through the
5828 array, and we must get TYPE_ALIGN set correctly on the array
5830 else if (TREE_CODE (type) == ARRAY_TYPE)
5833 if (!processing_template_decl
5834 && TREE_STATIC (decl)
5835 && !at_function_scope_p ()
5836 && current_function_decl == NULL)
5837 /* So decl is a global variable or a static member of a
5838 non local class. Record the types it uses
5839 so that we can decide later to emit debug info for them. */
5840 record_types_used_by_current_var_decl (decl);
5842 else if (TREE_CODE (decl) == FIELD_DECL
5843 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5844 error ("non-static data member %qD has Java class type", decl);
5846 /* Add this declaration to the statement-tree. This needs to happen
5847 after the call to check_initializer so that the DECL_EXPR for a
5848 reference temp is added before the DECL_EXPR for the reference itself. */
5849 if (at_function_scope_p ())
5850 add_decl_expr (decl);
5852 /* Let the middle end know about variables and functions -- but not
5853 static data members in uninstantiated class templates. */
5854 if (!saved_processing_template_decl
5855 && (TREE_CODE (decl) == VAR_DECL
5856 || TREE_CODE (decl) == FUNCTION_DECL))
5858 if (TREE_CODE (decl) == VAR_DECL)
5860 layout_var_decl (decl);
5861 maybe_commonize_var (decl);
5864 /* This needs to happen after the linkage is set. */
5865 determine_visibility (decl);
5867 if (var_definition_p && TREE_STATIC (decl))
5869 /* If a TREE_READONLY variable needs initialization
5870 at runtime, it is no longer readonly and we need to
5871 avoid MEM_READONLY_P being set on RTL created for it. */
5874 if (TREE_READONLY (decl))
5875 TREE_READONLY (decl) = 0;
5878 else if (was_readonly)
5879 TREE_READONLY (decl) = 1;
5882 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5884 /* Check for abstractness of the type. Notice that there is no
5885 need to strip array types here since the check for those types
5886 is already done within create_array_type_for_decl. */
5887 if (TREE_CODE (type) == FUNCTION_TYPE
5888 || TREE_CODE (type) == METHOD_TYPE)
5889 abstract_virtuals_error (decl, TREE_TYPE (type));
5891 abstract_virtuals_error (decl, type);
5893 if (TREE_TYPE (decl) == error_mark_node)
5894 /* No initialization required. */
5896 else if (TREE_CODE (decl) == FUNCTION_DECL)
5900 if (init == ridpointers[(int)RID_DEFAULT])
5902 /* An out-of-class default definition is defined at
5903 the point where it is explicitly defaulted. */
5904 if (DECL_INITIAL (decl) == error_mark_node)
5905 synthesize_method (decl);
5908 error ("function %q#D is initialized like a variable", decl);
5910 /* else no initialization required. */
5912 else if (DECL_EXTERNAL (decl)
5913 && ! (DECL_LANG_SPECIFIC (decl)
5914 && DECL_NOT_REALLY_EXTERN (decl)))
5917 DECL_INITIAL (decl) = init;
5919 /* A variable definition. */
5920 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5921 /* Initialize the local variable. */
5922 initialize_local_var (decl, init);
5924 /* If a variable is defined, and then a subsequent
5925 definition with external linkage is encountered, we will
5926 get here twice for the same variable. We want to avoid
5927 calling expand_static_init more than once. For variables
5928 that are not static data members, we can call
5929 expand_static_init only when we actually process the
5930 initializer. It is not legal to redeclare a static data
5931 member, so this issue does not arise in that case. */
5932 else if (var_definition_p && TREE_STATIC (decl))
5933 expand_static_init (decl, init);
5936 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5937 reference, insert it in the statement-tree now. */
5939 push_cleanup (decl, cleanup, false);
5942 processing_template_decl = saved_processing_template_decl;
5945 TREE_READONLY (decl) = 1;
5947 /* If this was marked 'used', be sure it will be output. */
5948 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5949 mark_decl_referenced (decl);
5952 /* Returns a declaration for a VAR_DECL as if:
5954 extern "C" TYPE NAME;
5956 had been seen. Used to create compiler-generated global
5960 declare_global_var (tree name, tree type)
5964 push_to_top_level ();
5965 decl = build_decl (input_location, VAR_DECL, name, type);
5966 TREE_PUBLIC (decl) = 1;
5967 DECL_EXTERNAL (decl) = 1;
5968 DECL_ARTIFICIAL (decl) = 1;
5969 /* If the user has explicitly declared this variable (perhaps
5970 because the code we are compiling is part of a low-level runtime
5971 library), then it is possible that our declaration will be merged
5972 with theirs by pushdecl. */
5973 decl = pushdecl (decl);
5974 cp_finish_decl (decl, NULL_TREE, false, NULL_TREE, 0);
5975 pop_from_top_level ();
5980 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5981 if "__cxa_atexit" is not being used) corresponding to the function
5982 to be called when the program exits. */
5985 get_atexit_fn_ptr_type (void)
5990 if (!atexit_fn_ptr_type_node)
5992 if (flag_use_cxa_atexit
5993 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5994 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5995 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5997 /* The parameter to "atexit" is "void (*)(void)". */
5998 arg_types = void_list_node;
6000 fn_type = build_function_type (void_type_node, arg_types);
6001 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
6004 return atexit_fn_ptr_type_node;
6007 /* Returns a pointer to the `atexit' function. Note that if
6008 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
6009 `__cxa_atexit' function specified in the IA64 C++ ABI. */
6012 get_atexit_node (void)
6019 bool use_aeabi_atexit;
6024 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6026 /* The declaration for `__cxa_atexit' is:
6028 int __cxa_atexit (void (*)(void *), void *, void *)
6030 We build up the argument types and then then function type
6033 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
6034 /* First, build the pointer-to-function type for the first
6036 fn_ptr_type = get_atexit_fn_ptr_type ();
6037 /* Then, build the rest of the argument types. */
6038 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
6039 if (use_aeabi_atexit)
6041 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6042 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6046 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
6047 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
6049 /* And the final __cxa_atexit type. */
6050 fn_type = build_function_type (integer_type_node, arg_types);
6051 fn_ptr_type = build_pointer_type (fn_type);
6052 if (use_aeabi_atexit)
6053 name = "__aeabi_atexit";
6055 name = "__cxa_atexit";
6059 /* The declaration for `atexit' is:
6061 int atexit (void (*)());
6063 We build up the argument types and then then function type
6065 fn_ptr_type = get_atexit_fn_ptr_type ();
6066 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
6067 /* Build the final atexit type. */
6068 fn_type = build_function_type (integer_type_node, arg_types);
6072 /* Now, build the function declaration. */
6073 push_lang_context (lang_name_c);
6074 atexit_fndecl = build_library_fn_ptr (name, fn_type);
6075 mark_used (atexit_fndecl);
6076 pop_lang_context ();
6077 atexit_node = decay_conversion (atexit_fndecl);
6082 /* Returns the __dso_handle VAR_DECL. */
6085 get_dso_handle_node (void)
6087 if (dso_handle_node)
6088 return dso_handle_node;
6090 /* Declare the variable. */
6091 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
6094 return dso_handle_node;
6097 /* Begin a new function with internal linkage whose job will be simply
6098 to destroy some particular variable. */
6100 static GTY(()) int start_cleanup_cnt;
6103 start_cleanup_fn (void)
6108 bool use_cxa_atexit = flag_use_cxa_atexit
6109 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6111 push_to_top_level ();
6113 /* No need to mangle this. */
6114 push_lang_context (lang_name_c);
6116 /* Build the name of the function. */
6117 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6118 /* Build the function declaration. */
6119 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6120 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6121 /* It's a function with internal linkage, generated by the
6123 TREE_PUBLIC (fndecl) = 0;
6124 DECL_ARTIFICIAL (fndecl) = 1;
6125 /* Make the function `inline' so that it is only emitted if it is
6126 actually needed. It is unlikely that it will be inlined, since
6127 it is only called via a function pointer, but we avoid unnecessary
6128 emissions this way. */
6129 DECL_DECLARED_INLINE_P (fndecl) = 1;
6130 DECL_INTERFACE_KNOWN (fndecl) = 1;
6131 /* Build the parameter. */
6136 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6137 DECL_CONTEXT (parmdecl) = fndecl;
6138 TREE_USED (parmdecl) = 1;
6139 DECL_ARGUMENTS (fndecl) = parmdecl;
6143 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6145 pop_lang_context ();
6147 return current_function_decl;
6150 /* Finish the cleanup function begun by start_cleanup_fn. */
6153 end_cleanup_fn (void)
6155 expand_or_defer_fn (finish_function (0));
6157 pop_from_top_level ();
6160 /* Generate code to handle the destruction of DECL, an object with
6161 static storage duration. */
6164 register_dtor_fn (tree decl)
6173 type = TREE_TYPE (decl);
6174 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6175 return void_zero_node;
6177 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6178 a class object, we can just pass the destructor to
6179 "__cxa_atexit"; we don't have to build a temporary function to do
6181 use_dtor = (flag_use_cxa_atexit
6182 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6183 && CLASS_TYPE_P (type));
6188 /* Find the destructor. */
6189 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6190 gcc_assert (idx >= 0);
6191 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6192 /* Make sure it is accessible. */
6193 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6197 /* Call build_cleanup before we enter the anonymous function so
6198 that any access checks will be done relative to the current
6199 scope, rather than the scope of the anonymous function. */
6200 build_cleanup (decl);
6202 /* Now start the function. */
6203 cleanup = start_cleanup_fn ();
6205 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6206 to the original function, rather than the anonymous one. That
6207 will make the back end think that nested functions are in use,
6208 which causes confusion. */
6209 push_deferring_access_checks (dk_no_check);
6210 fcall = build_cleanup (decl);
6211 pop_deferring_access_checks ();
6213 /* Create the body of the anonymous function. */
6214 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6215 finish_expr_stmt (fcall);
6216 finish_compound_stmt (compound_stmt);
6220 /* Call atexit with the cleanup function. */
6221 mark_used (cleanup);
6222 cleanup = build_address (cleanup);
6223 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6229 /* We must convert CLEANUP to the type that "__cxa_atexit"
6231 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6232 /* "__cxa_atexit" will pass the address of DECL to the
6233 cleanup function. */
6235 addr = build_address (decl);
6236 /* The declared type of the parameter to "__cxa_atexit" is
6237 "void *". For plain "T*", we could just let the
6238 machinery in cp_build_function_call convert it -- but if the
6239 type is "cv-qualified T *", then we need to convert it
6240 before passing it in, to avoid spurious errors. */
6241 addr = build_nop (ptr_type_node, addr);
6244 /* Since the cleanup functions we build ignore the address
6245 they're given, there's no reason to pass the actual address
6246 in, and, in general, it's cheaper to pass NULL than any
6248 addr = null_pointer_node;
6249 args = tree_cons (NULL_TREE,
6250 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6251 tf_warning_or_error),
6253 if (targetm.cxx.use_aeabi_atexit ())
6255 args = tree_cons (NULL_TREE, cleanup, args);
6256 args = tree_cons (NULL_TREE, addr, args);
6260 args = tree_cons (NULL_TREE, addr, args);
6261 args = tree_cons (NULL_TREE, cleanup, args);
6265 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6266 return cp_build_function_call (get_atexit_node (), args,
6267 tf_warning_or_error);
6270 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6271 is its initializer. Generate code to handle the construction
6272 and destruction of DECL. */
6275 expand_static_init (tree decl, tree init)
6277 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6278 gcc_assert (TREE_STATIC (decl));
6280 /* Some variables require no initialization. */
6282 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6283 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6286 if (DECL_FUNCTION_SCOPE_P (decl))
6288 /* Emit code to perform this initialization but once. */
6289 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6290 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6291 tree guard, guard_addr;
6292 tree acquire_fn, release_fn, abort_fn;
6295 /* Emit code to perform this initialization but once. This code
6298 static <type> guard;
6299 if (!guard.first_byte) {
6300 if (__cxa_guard_acquire (&guard)) {
6303 // Do initialization.
6304 flag = true; __cxa_guard_release (&guard);
6305 // Register variable for destruction at end of program.
6307 if (!flag) __cxa_guard_abort (&guard);
6311 Note that the `flag' variable is only set to 1 *after* the
6312 initialization is complete. This ensures that an exception,
6313 thrown during the construction, will cause the variable to
6314 reinitialized when we pass through this code again, as per:
6318 If the initialization exits by throwing an exception, the
6319 initialization is not complete, so it will be tried again
6320 the next time control enters the declaration.
6322 This process should be thread-safe, too; multiple threads
6323 should not be able to initialize the variable more than
6326 /* Create the guard variable. */
6327 guard = get_guard (decl);
6329 /* This optimization isn't safe on targets with relaxed memory
6330 consistency. On such targets we force synchronization in
6331 __cxa_guard_acquire. */
6332 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6334 /* Begin the conditional initialization. */
6335 if_stmt = begin_if_stmt ();
6336 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6337 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6340 if (flag_threadsafe_statics)
6342 guard_addr = build_address (guard);
6344 acquire_fn = get_identifier ("__cxa_guard_acquire");
6345 release_fn = get_identifier ("__cxa_guard_release");
6346 abort_fn = get_identifier ("__cxa_guard_abort");
6347 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6349 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6351 tree vfntype = build_function_type (void_type_node, argtypes);
6352 acquire_fn = push_library_fn
6353 (acquire_fn, build_function_type (integer_type_node, argtypes),
6355 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6356 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6360 release_fn = identifier_global_value (release_fn);
6361 abort_fn = identifier_global_value (abort_fn);
6364 inner_if_stmt = begin_if_stmt ();
6365 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6368 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6369 begin = get_target_expr (boolean_false_node);
6370 flag = TARGET_EXPR_SLOT (begin);
6372 TARGET_EXPR_CLEANUP (begin)
6373 = build3 (COND_EXPR, void_type_node, flag,
6375 build_call_n (abort_fn, 1, guard_addr));
6376 CLEANUP_EH_ONLY (begin) = 1;
6378 /* Do the initialization itself. */
6379 init = add_stmt_to_compound (begin, init);
6380 init = add_stmt_to_compound
6381 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6382 init = add_stmt_to_compound
6383 (init, build_call_n (release_fn, 1, guard_addr));
6386 init = add_stmt_to_compound (init, set_guard (guard));
6388 /* Use atexit to register a function for destroying this static
6390 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6392 finish_expr_stmt (init);
6394 if (flag_threadsafe_statics)
6396 finish_compound_stmt (inner_then_clause);
6397 finish_then_clause (inner_if_stmt);
6398 finish_if_stmt (inner_if_stmt);
6401 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6403 finish_compound_stmt (then_clause);
6404 finish_then_clause (if_stmt);
6405 finish_if_stmt (if_stmt);
6409 static_aggregates = tree_cons (init, decl, static_aggregates);
6413 /* Make TYPE a complete type based on INITIAL_VALUE.
6414 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6415 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6416 3 if the initializer list is empty (in pedantic mode). */
6419 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6422 tree type, elt_type;
6426 unsigned HOST_WIDE_INT i;
6429 /* An array of character type can be initialized from a
6430 brace-enclosed string constant.
6432 FIXME: this code is duplicated from reshape_init. Probably
6433 we should just call reshape_init here? */
6434 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6435 && TREE_CODE (initial_value) == CONSTRUCTOR
6436 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6438 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6439 tree value = VEC_index (constructor_elt, v, 0)->value;
6441 if (TREE_CODE (value) == STRING_CST
6442 && VEC_length (constructor_elt, v) == 1)
6443 initial_value = value;
6446 /* If any of the elements are parameter packs, we can't actually
6447 complete this type now because the array size is dependent. */
6448 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6450 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6453 if (PACK_EXPANSION_P (value))
6459 failure = complete_array_type (ptype, initial_value, do_default);
6461 /* We can create the array before the element type is complete, which
6462 means that we didn't have these two bits set in the original type
6463 either. In completing the type, we are expected to propagate these
6464 bits. See also complete_type which does the same thing for arrays
6467 if (TYPE_DOMAIN (type))
6469 elt_type = TREE_TYPE (type);
6470 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6471 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6472 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6478 /* Return zero if something is declared to be a member of type
6479 CTYPE when in the context of CUR_TYPE. STRING is the error
6480 message to print in that case. Otherwise, quietly return 1. */
6483 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6485 if (ctype && ctype != cur_type)
6487 if (flags == DTOR_FLAG)
6488 error ("destructor for alien class %qT cannot be a member", ctype);
6490 error ("constructor for alien class %qT cannot be a member", ctype);
6496 /* Subroutine of `grokdeclarator'. */
6498 /* Generate errors possibly applicable for a given set of specifiers.
6499 This is for ARM $7.1.2. */
6502 bad_specifiers (tree object,
6511 error ("%qD declared as a %<virtual%> %s", object, type);
6513 error ("%qD declared as an %<inline%> %s", object, type);
6515 error ("%<const%> and %<volatile%> function specifiers on "
6516 "%qD invalid in %s declaration",
6519 error ("%q+D declared as a friend", object);
6521 && (TREE_CODE (object) == TYPE_DECL
6522 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6523 && !TYPE_REFFN_P (TREE_TYPE (object))
6524 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6525 error ("%q+D declared with an exception specification", object);
6528 /* DECL is a member function or static data member and is presently
6529 being defined. Check that the definition is taking place in a
6533 check_class_member_definition_namespace (tree decl)
6535 /* These checks only apply to member functions and static data
6537 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6538 || TREE_CODE (decl) == VAR_DECL);
6539 /* We check for problems with specializations in pt.c in
6540 check_specialization_namespace, where we can issue better
6542 if (processing_specialization)
6544 /* There are no restrictions on the placement of
6545 explicit instantiations. */
6546 if (processing_explicit_instantiation)
6550 A member function definition that appears outside of the
6551 class definition shall appear in a namespace scope enclosing
6552 the class definition.
6556 The definition for a static data member shall appear in a
6557 namespace scope enclosing the member's class definition. */
6558 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6559 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6560 decl, DECL_CONTEXT (decl));
6563 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6564 METHOD_TYPE for a non-static member function; QUALS are the
6565 cv-qualifiers that apply to the function. */
6568 build_this_parm (tree type, cp_cv_quals quals)
6573 cp_cv_quals this_quals;
6575 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6576 /* The `this' parameter is implicitly `const'; it cannot be
6578 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6579 qual_type = cp_build_qualified_type (this_type, this_quals);
6580 parm = build_artificial_parm (this_identifier, qual_type);
6581 cp_apply_type_quals_to_decl (this_quals, parm);
6585 /* CTYPE is class type, or null if non-class.
6586 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6588 DECLARATOR is the function's name.
6589 PARMS is a chain of PARM_DECLs for the function.
6590 VIRTUALP is truthvalue of whether the function is virtual or not.
6591 FLAGS are to be passed through to `grokclassfn'.
6592 QUALS are qualifiers indicating whether the function is `const'
6594 RAISES is a list of exceptions that this function can raise.
6595 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6596 not look, and -1 if we should not call `grokclassfn' at all.
6598 SFK is the kind of special function (if any) for the new function.
6600 Returns `NULL_TREE' if something goes wrong, after issuing
6601 applicable error messages. */
6604 grokfndecl (tree ctype,
6608 tree orig_declarator,
6610 enum overload_flags flags,
6617 special_function_kind sfk,
6622 location_t location)
6625 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6629 type = build_exception_variant (type, raises);
6631 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6633 /* If we have an explicit location, use it, otherwise use whatever
6634 build_lang_decl used (probably input_location). */
6635 if (location != UNKNOWN_LOCATION)
6636 DECL_SOURCE_LOCATION (decl) = location;
6638 if (TREE_CODE (type) == METHOD_TYPE)
6641 parm = build_this_parm (type, quals);
6642 TREE_CHAIN (parm) = parms;
6645 DECL_ARGUMENTS (decl) = parms;
6646 for (t = parms; t; t = TREE_CHAIN (t))
6647 DECL_CONTEXT (t) = decl;
6648 /* Propagate volatile out from type to decl. */
6649 if (TYPE_VOLATILE (type))
6650 TREE_THIS_VOLATILE (decl) = 1;
6652 /* Setup decl according to sfk. */
6655 case sfk_constructor:
6656 case sfk_copy_constructor:
6657 case sfk_move_constructor:
6658 DECL_CONSTRUCTOR_P (decl) = 1;
6660 case sfk_destructor:
6661 DECL_DESTRUCTOR_P (decl) = 1;
6667 /* If pointers to member functions use the least significant bit to
6668 indicate whether a function is virtual, ensure a pointer
6669 to this function will have that bit clear. */
6670 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6671 && TREE_CODE (type) == METHOD_TYPE
6672 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6673 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6676 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6680 ("defining explicit specialization %qD in friend declaration",
6684 tree fns = TREE_OPERAND (orig_declarator, 0);
6685 tree args = TREE_OPERAND (orig_declarator, 1);
6687 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6689 /* Something like `template <class T> friend void f<T>()'. */
6690 error ("invalid use of template-id %qD in declaration "
6691 "of primary template",
6697 /* A friend declaration of the form friend void f<>(). Record
6698 the information in the TEMPLATE_ID_EXPR. */
6699 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6701 if (TREE_CODE (fns) == COMPONENT_REF)
6703 /* Due to bison parser ickiness, we will have already looked
6704 up an operator_name or PFUNCNAME within the current class
6705 (see template_id in parse.y). If the current class contains
6706 such a name, we'll get a COMPONENT_REF here. Undo that. */
6708 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6709 == current_class_type);
6710 fns = TREE_OPERAND (fns, 1);
6712 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6713 || TREE_CODE (fns) == OVERLOAD);
6714 DECL_TEMPLATE_INFO (decl) = build_template_info (fns, args);
6716 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6717 if (TREE_PURPOSE (t)
6718 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6720 error ("default arguments are not allowed in declaration "
6721 "of friend template specialization %qD",
6728 error ("%<inline%> is not allowed in declaration of friend "
6729 "template specialization %qD",
6736 /* If this decl has namespace scope, set that up. */
6738 set_decl_namespace (decl, in_namespace, friendp);
6740 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6742 /* `main' and builtins have implicit 'C' linkage. */
6743 if ((MAIN_NAME_P (declarator)
6744 || (IDENTIFIER_LENGTH (declarator) > 10
6745 && IDENTIFIER_POINTER (declarator)[0] == '_'
6746 && IDENTIFIER_POINTER (declarator)[1] == '_'
6747 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6748 && current_lang_name == lang_name_cplusplus
6749 && ctype == NULL_TREE
6750 /* NULL_TREE means global namespace. */
6751 && DECL_CONTEXT (decl) == NULL_TREE)
6752 SET_DECL_LANGUAGE (decl, lang_c);
6754 /* Should probably propagate const out from type to decl I bet (mrs). */
6757 DECL_STATIC_FUNCTION_P (decl) = 1;
6758 DECL_CONTEXT (decl) = ctype;
6763 DECL_CONTEXT (decl) = ctype;
6765 check_class_member_definition_namespace (decl);
6768 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6770 if (processing_template_decl)
6771 error ("cannot declare %<::main%> to be a template");
6773 error ("cannot declare %<::main%> to be inline");
6775 error ("cannot declare %<::main%> to be static");
6780 /* Members of anonymous types and local classes have no linkage; make
6781 them internal. If a typedef is made later, this will be changed. */
6782 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6783 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6786 if (publicp && cxx_dialect == cxx98)
6788 /* [basic.link]: A name with no linkage (notably, the name of a class
6789 or enumeration declared in a local scope) shall not be used to
6790 declare an entity with linkage.
6792 DR 757 relaxes this restriction for C++0x. */
6793 t = no_linkage_check (TREE_TYPE (decl),
6794 /*relaxed_p=*/false);
6797 if (TYPE_ANONYMOUS_P (t))
6799 if (DECL_EXTERN_C_P (decl))
6800 /* Allow this; it's pretty common in C. */;
6803 permerror (input_location, "non-local function %q#D uses anonymous type",
6805 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6806 permerror (input_location, "%q+#D does not refer to the unqualified "
6807 "type, so it is not used for linkage",
6812 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6816 TREE_PUBLIC (decl) = publicp;
6819 DECL_INTERFACE_KNOWN (decl) = 1;
6820 DECL_NOT_REALLY_EXTERN (decl) = 1;
6823 /* If the declaration was declared inline, mark it as such. */
6825 DECL_DECLARED_INLINE_P (decl) = 1;
6827 DECL_EXTERNAL (decl) = 1;
6828 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6831 ? G_("static member function %qD cannot have cv-qualifier")
6832 : G_("non-member function %qD cannot have cv-qualifier"),
6834 quals = TYPE_UNQUALIFIED;
6837 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6838 && !grok_op_properties (decl, /*complain=*/true))
6842 /* Make the init_value nonzero so pushdecl knows this is not
6843 tentative. error_mark_node is replaced later with the BLOCK. */
6844 DECL_INITIAL (decl) = error_mark_node;
6846 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6847 TREE_NOTHROW (decl) = 1;
6849 /* Caller will do the rest of this. */
6853 if (ctype != NULL_TREE)
6854 grokclassfn (ctype, decl, flags);
6856 decl = check_explicit_specialization (orig_declarator, decl,
6859 4 * (friendp != 0));
6860 if (decl == error_mark_node)
6865 cplus_decl_attributes (&decl, *attrlist, 0);
6866 *attrlist = NULL_TREE;
6869 /* Check main's type after attributes have been applied. */
6870 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6872 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6875 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6877 error ("%<::main%> must return %<int%>");
6878 newtype = build_function_type (integer_type_node, oldtypeargs);
6879 TREE_TYPE (decl) = newtype;
6882 check_main_parameter_types (decl);
6885 if (ctype != NULL_TREE
6886 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6889 tree old_decl = check_classfn (ctype, decl,
6890 (processing_template_decl
6891 > template_class_depth (ctype))
6892 ? current_template_parms
6895 if (old_decl == error_mark_node)
6903 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6904 /* Because grokfndecl is always supposed to return a
6905 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6906 here. We depend on our callers to figure out that its
6907 really a template that's being returned. */
6908 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6910 if (DECL_STATIC_FUNCTION_P (old_decl)
6911 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6912 /* Remove the `this' parm added by grokclassfn.
6913 XXX Isn't this done in start_function, too? */
6914 revert_static_member_fn (decl);
6915 if (DECL_ARTIFICIAL (old_decl))
6917 error ("definition of implicitly-declared %qD", old_decl);
6921 /* Since we've smashed OLD_DECL to its
6922 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6923 if (TREE_CODE (decl) == TEMPLATE_DECL)
6924 decl = DECL_TEMPLATE_RESULT (decl);
6926 /* Attempt to merge the declarations. This can fail, in
6927 the case of some invalid specialization declarations. */
6928 pushed_scope = push_scope (ctype);
6929 ok = duplicate_decls (decl, old_decl, friendp);
6931 pop_scope (pushed_scope);
6934 error ("no %q#D member function declared in class %qT",
6942 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6945 if (ctype == NULL_TREE || check)
6949 DECL_VIRTUAL_P (decl) = 1;
6954 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6955 the linkage that DECL will receive in the object file. */
6958 set_linkage_for_static_data_member (tree decl)
6960 /* A static data member always has static storage duration and
6961 external linkage. Note that static data members are forbidden in
6962 local classes -- the only situation in which a class has
6963 non-external linkage. */
6964 TREE_PUBLIC (decl) = 1;
6965 TREE_STATIC (decl) = 1;
6966 /* For non-template classes, static data members are always put
6967 out in exactly those files where they are defined, just as
6968 with ordinary namespace-scope variables. */
6969 if (!processing_template_decl)
6970 DECL_INTERFACE_KNOWN (decl) = 1;
6973 /* Create a VAR_DECL named NAME with the indicated TYPE.
6975 If SCOPE is non-NULL, it is the class type or namespace containing
6976 the variable. If SCOPE is NULL, the variable should is created in
6977 the innermost enclosings scope. */
6980 grokvardecl (tree type,
6982 const cp_decl_specifier_seq *declspecs,
6988 tree explicit_scope;
6990 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6992 /* Compute the scope in which to place the variable, but remember
6993 whether or not that scope was explicitly specified by the user. */
6994 explicit_scope = scope;
6997 /* An explicit "extern" specifier indicates a namespace-scope
6999 if (declspecs->storage_class == sc_extern)
7000 scope = current_namespace;
7001 else if (!at_function_scope_p ())
7002 scope = current_scope ();
7006 && (/* If the variable is a namespace-scope variable declared in a
7007 template, we need DECL_LANG_SPECIFIC. */
7008 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
7009 /* Similarly for namespace-scope variables with language linkage
7011 || (TREE_CODE (scope) == NAMESPACE_DECL
7012 && current_lang_name != lang_name_cplusplus)
7013 /* Similarly for static data members. */
7015 decl = build_lang_decl (VAR_DECL, name, type);
7017 decl = build_decl (input_location, VAR_DECL, name, type);
7019 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
7020 set_decl_namespace (decl, explicit_scope, 0);
7022 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
7024 if (declspecs->storage_class == sc_extern)
7026 DECL_THIS_EXTERN (decl) = 1;
7027 DECL_EXTERNAL (decl) = !initialized;
7030 if (DECL_CLASS_SCOPE_P (decl))
7032 set_linkage_for_static_data_member (decl);
7033 /* This function is only called with out-of-class definitions. */
7034 DECL_EXTERNAL (decl) = 0;
7035 check_class_member_definition_namespace (decl);
7037 /* At top level, either `static' or no s.c. makes a definition
7038 (perhaps tentative), and absence of `static' makes it public. */
7039 else if (toplevel_bindings_p ())
7041 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
7042 && (DECL_THIS_EXTERN (decl) || ! constp));
7043 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
7045 /* Not at top level, only `static' makes a static definition. */
7048 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
7049 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
7052 if (declspecs->specs[(int)ds_thread])
7053 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
7055 /* If the type of the decl has no linkage, make sure that we'll
7056 notice that in mark_used. */
7057 if (cxx_dialect > cxx98
7058 && decl_linkage (decl) != lk_none
7059 && DECL_LANG_SPECIFIC (decl) == NULL
7060 && !DECL_EXTERN_C_P (decl)
7061 && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
7062 retrofit_lang_decl (decl);
7064 if (TREE_PUBLIC (decl))
7066 /* [basic.link]: A name with no linkage (notably, the name of a class
7067 or enumeration declared in a local scope) shall not be used to
7068 declare an entity with linkage.
7070 DR 757 relaxes this restriction for C++0x. */
7071 tree t = (cxx_dialect > cxx98 ? NULL_TREE
7072 : no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false));
7075 if (TYPE_ANONYMOUS_P (t))
7077 if (DECL_EXTERN_C_P (decl))
7078 /* Allow this; it's pretty common in C. */
7082 /* DRs 132, 319 and 389 seem to indicate types with
7083 no linkage can only be used to declare extern "C"
7084 entities. Since it's not always an error in the
7085 ISO C++ 90 Standard, we only issue a warning. */
7086 warning (0, "non-local variable %q#D uses anonymous type",
7088 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
7089 warning (0, "%q+#D does not refer to the unqualified "
7090 "type, so it is not used for linkage",
7095 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
7099 DECL_INTERFACE_KNOWN (decl) = 1;
7104 /* Create and return a canonical pointer to member function type, for
7105 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
7108 build_ptrmemfunc_type (tree type)
7112 tree unqualified_variant = NULL_TREE;
7114 if (type == error_mark_node)
7117 /* If a canonical type already exists for this type, use it. We use
7118 this method instead of type_hash_canon, because it only does a
7119 simple equality check on the list of field members. */
7121 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7124 /* Make sure that we always have the unqualified pointer-to-member
7126 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7128 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7130 t = make_class_type (RECORD_TYPE);
7131 xref_basetypes (t, NULL_TREE);
7133 /* Let the front end know this is a pointer to member function... */
7134 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7135 /* ... and not really a class type. */
7136 SET_CLASS_TYPE_P (t, 0);
7138 field = build_decl (input_location, FIELD_DECL, pfn_identifier, type);
7141 field = build_decl (input_location, FIELD_DECL, delta_identifier,
7143 TREE_CHAIN (field) = fields;
7146 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7148 /* Zap out the name so that the back end will give us the debugging
7149 information for this anonymous RECORD_TYPE. */
7150 TYPE_NAME (t) = NULL_TREE;
7152 /* If this is not the unqualified form of this pointer-to-member
7153 type, set the TYPE_MAIN_VARIANT for this type to be the
7154 unqualified type. Since they are actually RECORD_TYPEs that are
7155 not variants of each other, we must do this manually.
7156 As we just built a new type there is no need to do yet another copy. */
7157 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7159 int type_quals = cp_type_quals (type);
7160 TYPE_READONLY (t) = (type_quals & TYPE_QUAL_CONST) != 0;
7161 TYPE_VOLATILE (t) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
7162 TYPE_RESTRICT (t) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
7163 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7164 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7165 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7166 TREE_TYPE (TYPE_BINFO (t)) = t;
7169 /* Cache this pointer-to-member type so that we can find it again
7171 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7173 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7174 SET_TYPE_STRUCTURAL_EQUALITY (t);
7175 else if (TYPE_CANONICAL (type) != type)
7176 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7181 /* Create and return a pointer to data member type. */
7184 build_ptrmem_type (tree class_type, tree member_type)
7186 if (TREE_CODE (member_type) == METHOD_TYPE)
7188 tree arg_types = TYPE_ARG_TYPES (member_type);
7189 cp_cv_quals quals = cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)));
7190 member_type = build_memfn_type (member_type, class_type, quals);
7191 return build_ptrmemfunc_type (build_pointer_type (member_type));
7195 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7196 return build_offset_type (class_type, member_type);
7200 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7201 Check to see that the definition is valid. Issue appropriate error
7202 messages. Return 1 if the definition is particularly bad, or 0
7206 check_static_variable_definition (tree decl, tree type)
7208 /* Motion 10 at San Diego: If a static const integral data member is
7209 initialized with an integral constant expression, the initializer
7210 may appear either in the declaration (within the class), or in
7211 the definition, but not both. If it appears in the class, the
7212 member is a member constant. The file-scope definition is always
7214 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7216 error ("invalid in-class initialization of static data member "
7217 "of non-integral type %qT",
7219 /* If we just return the declaration, crashes will sometimes
7220 occur. We therefore return void_type_node, as if this were a
7221 friend declaration, to cause callers to completely ignore
7222 this declaration. */
7225 else if (!CP_TYPE_CONST_P (type))
7226 error ("ISO C++ forbids in-class initialization of non-const "
7227 "static member %qD",
7229 else if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type))
7230 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7231 "%qD of non-integral type %qT", decl, type);
7236 /* Given the SIZE (i.e., number of elements) in an array, compute an
7237 appropriate index type for the array. If non-NULL, NAME is the
7238 name of the thing being declared. */
7241 compute_array_index_type (tree name, tree size)
7245 tree abi_1_itype = NULL_TREE;
7247 if (error_operand_p (size))
7248 return error_mark_node;
7250 type = TREE_TYPE (size);
7251 /* The array bound must be an integer type. */
7252 if (!dependent_type_p (type) && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (type))
7255 error ("size of array %qD has non-integral type %qT", name, type);
7257 error ("size of array has non-integral type %qT", type);
7258 size = integer_one_node;
7259 type = TREE_TYPE (size);
7262 /* We can only call value_dependent_expression_p on integral constant
7263 expressions; the parser adds a dummy NOP_EXPR with TREE_SIDE_EFFECTS
7264 set if this isn't one. */
7265 if (processing_template_decl
7266 && (TREE_SIDE_EFFECTS (size) || value_dependent_expression_p (size)))
7268 /* We cannot do any checking for a SIZE that isn't known to be
7269 constant. Just build the index type and mark that it requires
7270 structural equality checks. */
7271 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7272 size, integer_one_node));
7273 if (!TREE_SIDE_EFFECTS (size))
7275 TYPE_DEPENDENT_P (itype) = 1;
7276 TYPE_DEPENDENT_P_VALID (itype) = 1;
7278 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7282 if (!abi_version_at_least (2) && processing_template_decl)
7283 /* For abi-1, we handled all instances in templates the same way,
7284 even when they were non-dependent. This affects the manglings
7285 produced. So, we do the normal checking for non-dependent
7286 sizes, but at the end we'll return the same type that abi-1
7287 would have, but with TYPE_CANONICAL set to the "right"
7288 value that the current ABI would provide. */
7289 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7290 size, integer_one_node));
7292 /* The size might be the result of a cast. */
7293 STRIP_TYPE_NOPS (size);
7295 /* It might be a const variable or enumeration constant. */
7296 size = integral_constant_value (size);
7298 /* Normally, the array-bound will be a constant. */
7299 if (TREE_CODE (size) == INTEGER_CST)
7301 /* Check to see if the array bound overflowed. Make that an
7302 error, no matter how generous we're being. */
7303 constant_expression_error (size);
7305 /* An array must have a positive number of elements. */
7306 if (INT_CST_LT (size, integer_zero_node))
7309 error ("size of array %qD is negative", name);
7311 error ("size of array is negative");
7312 size = integer_one_node;
7314 /* As an extension we allow zero-sized arrays. We always allow
7315 them in system headers because glibc uses them. */
7316 else if (integer_zerop (size) && !in_system_header)
7319 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7321 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7324 else if (TREE_CONSTANT (size))
7326 /* `(int) &fn' is not a valid array bound. */
7328 error ("size of array %qD is not an integral constant-expression",
7331 error ("size of array is not an integral constant-expression");
7332 size = integer_one_node;
7334 else if (pedantic && warn_vla != 0)
7337 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7339 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7341 else if (warn_vla > 0)
7345 "variable length array %qD is used", name);
7348 "variable length array is used");
7351 if (processing_template_decl && !TREE_CONSTANT (size))
7352 /* A variable sized array. */
7353 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7356 HOST_WIDE_INT saved_processing_template_decl;
7358 /* Compute the index of the largest element in the array. It is
7359 one less than the number of elements in the array. We save
7360 and restore PROCESSING_TEMPLATE_DECL so that computations in
7361 cp_build_binary_op will be appropriately folded. */
7362 saved_processing_template_decl = processing_template_decl;
7363 processing_template_decl = 0;
7364 itype = cp_build_binary_op (input_location,
7366 cp_convert (ssizetype, size),
7367 cp_convert (ssizetype, integer_one_node),
7368 tf_warning_or_error);
7369 itype = fold (itype);
7370 processing_template_decl = saved_processing_template_decl;
7372 if (!TREE_CONSTANT (itype))
7373 /* A variable sized array. */
7374 itype = variable_size (itype);
7375 /* Make sure that there was no overflow when creating to a signed
7376 index type. (For example, on a 32-bit machine, an array with
7377 size 2^32 - 1 is too big.) */
7378 else if (TREE_CODE (itype) == INTEGER_CST
7379 && TREE_OVERFLOW (itype))
7381 error ("overflow in array dimension");
7382 TREE_OVERFLOW (itype) = 0;
7386 /* Create and return the appropriate index type. */
7389 tree t = build_index_type (itype);
7390 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7394 return build_index_type (itype);
7397 /* Returns the scope (if any) in which the entity declared by
7398 DECLARATOR will be located. If the entity was declared with an
7399 unqualified name, NULL_TREE is returned. */
7402 get_scope_of_declarator (const cp_declarator *declarator)
7404 while (declarator && declarator->kind != cdk_id)
7405 declarator = declarator->declarator;
7407 /* If the declarator-id is a SCOPE_REF, the scope in which the
7408 declaration occurs is the first operand. */
7410 && declarator->u.id.qualifying_scope)
7411 return declarator->u.id.qualifying_scope;
7413 /* Otherwise, the declarator is not a qualified name; the entity will
7414 be declared in the current scope. */
7418 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7419 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7423 create_array_type_for_decl (tree name, tree type, tree size)
7425 tree itype = NULL_TREE;
7426 const char* error_msg;
7428 /* If things have already gone awry, bail now. */
7429 if (type == error_mark_node || size == error_mark_node)
7430 return error_mark_node;
7432 /* Assume that everything will go OK. */
7435 /* If there are some types which cannot be array elements,
7436 issue an error-message and return. */
7437 switch (TREE_CODE (type))
7441 error ("declaration of %qD as array of void", name);
7443 error ("creating array of void");
7444 return error_mark_node;
7449 error ("declaration of %qD as array of functions", name);
7451 error ("creating array of functions");
7452 return error_mark_node;
7455 case REFERENCE_TYPE:
7457 error ("declaration of %qD as array of references", name);
7459 error ("creating array of references");
7460 return error_mark_node;
7465 error ("declaration of %qD as array of function members", name);
7467 error ("creating array of function members");
7468 return error_mark_node;
7477 The constant expressions that specify the bounds of the arrays
7478 can be omitted only for the first member of the sequence. */
7479 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7482 error ("declaration of %qD as multidimensional array must "
7483 "have bounds for all dimensions except the first",
7486 error ("multidimensional array must have bounds for all "
7487 "dimensions except the first");
7489 return error_mark_node;
7492 /* Figure out the index type for the array. */
7494 itype = compute_array_index_type (name, size);
7497 T is called the array element type; this type shall not be [...] an
7498 abstract class type. */
7499 abstract_virtuals_error (name, type);
7501 return build_cplus_array_type (type, itype);
7504 /* Check that it's OK to declare a function with the indicated TYPE.
7505 SFK indicates the kind of special function (if any) that this
7506 function is. OPTYPE is the type given in a conversion operator
7507 declaration, or the class type for a constructor/destructor.
7508 Returns the actual return type of the function; that
7509 may be different than TYPE if an error occurs, or for certain
7510 special functions. */
7513 check_special_function_return_type (special_function_kind sfk,
7519 case sfk_constructor:
7521 error ("return type specification for constructor invalid");
7523 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7524 type = build_pointer_type (optype);
7526 type = void_type_node;
7529 case sfk_destructor:
7531 error ("return type specification for destructor invalid");
7532 /* We can't use the proper return type here because we run into
7533 problems with ambiguous bases and covariant returns.
7534 Java classes are left unchanged because (void *) isn't a valid
7535 Java type, and we don't want to change the Java ABI. */
7536 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7537 type = build_pointer_type (void_type_node);
7539 type = void_type_node;
7542 case sfk_conversion:
7544 error ("return type specified for %<operator %T%>", optype);
7555 /* A variable or data member (whose unqualified name is IDENTIFIER)
7556 has been declared with the indicated TYPE. If the TYPE is not
7557 acceptable, issue an error message and return a type to use for
7558 error-recovery purposes. */
7561 check_var_type (tree identifier, tree type)
7563 if (VOID_TYPE_P (type))
7566 error ("unnamed variable or field declared void");
7567 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7569 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7570 error ("variable or field %qE declared void", identifier);
7573 error ("variable or field declared void");
7574 type = error_mark_node;
7580 /* Given declspecs and a declarator (abstract or otherwise), determine
7581 the name and type of the object declared and construct a DECL node
7584 DECLSPECS points to the representation of declaration-specifier
7585 sequence that precedes declarator.
7587 DECL_CONTEXT says which syntactic context this declaration is in:
7588 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7589 FUNCDEF for a function definition. Like NORMAL but a few different
7590 error messages in each case. Return value may be zero meaning
7591 this definition is too screwy to try to parse.
7592 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7593 handle member functions (which have FIELD context).
7594 Return value may be zero meaning this definition is too screwy to
7596 PARM for a parameter declaration (either within a function prototype
7597 or before a function body). Make a PARM_DECL, or return void_type_node.
7598 TPARM for a template parameter declaration.
7599 CATCHPARM for a parameter declaration before a catch clause.
7600 TYPENAME if for a typename (in a cast or sizeof).
7601 Don't make a DECL node; just return the ..._TYPE node.
7602 FIELD for a struct or union field; make a FIELD_DECL.
7603 BITFIELD for a field with specified width.
7605 INITIALIZED is as for start_decl.
7607 ATTRLIST is a pointer to the list of attributes, which may be NULL
7608 if there are none; *ATTRLIST may be modified if attributes from inside
7609 the declarator should be applied to the declaration.
7611 When this function is called, scoping variables (such as
7612 CURRENT_CLASS_TYPE) should reflect the scope in which the
7613 declaration occurs, not the scope in which the new declaration will
7614 be placed. For example, on:
7618 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7621 Returns a DECL (if a declarator is present), a TYPE (if there is no
7622 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7626 grokdeclarator (const cp_declarator *declarator,
7627 const cp_decl_specifier_seq *declspecs,
7628 enum decl_context decl_context,
7632 tree type = NULL_TREE;
7634 int virtualp, explicitp, friendp, inlinep, staticp;
7635 int explicit_int = 0;
7636 int explicit_char = 0;
7637 int defaulted_int = 0;
7638 tree dependent_name = NULL_TREE;
7640 tree typedef_decl = NULL_TREE;
7641 const char *name = NULL;
7642 tree typedef_type = NULL_TREE;
7643 /* True if this declarator is a function definition. */
7644 bool funcdef_flag = false;
7645 cp_declarator_kind innermost_code = cdk_error;
7648 /* See the code below that used this. */
7649 tree decl_attr = NULL_TREE;
7652 /* Keep track of what sort of function is being processed
7653 so that we can warn about default return values, or explicit
7654 return values which do not match prescribed defaults. */
7655 special_function_kind sfk = sfk_none;
7657 tree dname = NULL_TREE;
7658 tree ctor_return_type = NULL_TREE;
7659 enum overload_flags flags = NO_SPECIAL;
7660 /* cv-qualifiers that apply to the declarator, for a declaration of
7661 a member function. */
7662 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7663 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7665 tree raises = NULL_TREE;
7666 int template_count = 0;
7667 tree returned_attrs = NULL_TREE;
7668 tree parms = NULL_TREE;
7669 const cp_declarator *id_declarator;
7670 /* The unqualified name of the declarator; either an
7671 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7672 tree unqualified_id;
7673 /* The class type, if any, in which this entity is located,
7674 or NULL_TREE if none. Note that this value may be different from
7675 the current class type; for example if an attempt is made to declare
7676 "A::f" inside "B", this value will be "A". */
7677 tree ctype = current_class_type;
7678 /* The NAMESPACE_DECL for the namespace in which this entity is
7679 located. If an unqualified name is used to declare the entity,
7680 this value will be NULL_TREE, even if the entity is located at
7682 tree in_namespace = NULL_TREE;
7683 cp_storage_class storage_class;
7684 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7685 bool type_was_error_mark_node = false;
7686 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7687 bool template_type_arg = false;
7688 bool template_parm_flag = false;
7689 bool constexpr_p = declspecs->specs[(int) ds_constexpr];
7692 signed_p = declspecs->specs[(int)ds_signed];
7693 unsigned_p = declspecs->specs[(int)ds_unsigned];
7694 short_p = declspecs->specs[(int)ds_short];
7695 long_p = declspecs->specs[(int)ds_long];
7696 longlong = declspecs->specs[(int)ds_long] >= 2;
7697 thread_p = declspecs->specs[(int)ds_thread];
7699 if (decl_context == FUNCDEF)
7700 funcdef_flag = true, decl_context = NORMAL;
7701 else if (decl_context == MEMFUNCDEF)
7702 funcdef_flag = true, decl_context = FIELD;
7703 else if (decl_context == BITFIELD)
7704 bitfield = 1, decl_context = FIELD;
7705 else if (decl_context == TEMPLATE_TYPE_ARG)
7706 template_type_arg = true, decl_context = TYPENAME;
7707 else if (decl_context == TPARM)
7708 template_parm_flag = true, decl_context = PARM;
7710 if (initialized > 1)
7711 funcdef_flag = true;
7713 /* Look inside a declarator for the name being declared
7714 and get it as a string, for an error message. */
7715 for (id_declarator = declarator;
7717 id_declarator = id_declarator->declarator)
7719 if (id_declarator->kind != cdk_id)
7720 innermost_code = id_declarator->kind;
7722 switch (id_declarator->kind)
7725 if (id_declarator->declarator
7726 && id_declarator->declarator->kind == cdk_id)
7728 sfk = id_declarator->declarator->u.id.sfk;
7729 if (sfk == sfk_destructor)
7736 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7737 tree decl = id_declarator->u.id.unqualified_name;
7740 if (qualifying_scope)
7742 if (at_function_scope_p ())
7746 A declarator-id shall not be qualified except
7749 None of the cases are permitted in block
7751 if (qualifying_scope == global_namespace)
7752 error ("invalid use of qualified-name %<::%D%>",
7754 else if (TYPE_P (qualifying_scope))
7755 error ("invalid use of qualified-name %<%T::%D%>",
7756 qualifying_scope, decl);
7758 error ("invalid use of qualified-name %<%D::%D%>",
7759 qualifying_scope, decl);
7760 return error_mark_node;
7762 else if (TYPE_P (qualifying_scope))
7764 ctype = qualifying_scope;
7765 if (innermost_code != cdk_function
7766 && current_class_type
7767 && !UNIQUELY_DERIVED_FROM_P (ctype,
7768 current_class_type))
7770 error ("type %qT is not derived from type %qT",
7771 ctype, current_class_type);
7772 return error_mark_node;
7775 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7776 in_namespace = qualifying_scope;
7778 switch (TREE_CODE (decl))
7784 if (innermost_code != cdk_function)
7786 error ("declaration of %qD as non-function", decl);
7787 return error_mark_node;
7789 else if (!qualifying_scope
7790 && !(current_class_type && at_class_scope_p ()))
7792 error ("declaration of %qD as non-member", decl);
7793 return error_mark_node;
7796 type = TREE_OPERAND (decl, 0);
7798 type = constructor_name (type);
7799 name = identifier_to_locale (IDENTIFIER_POINTER (type));
7804 case TEMPLATE_ID_EXPR:
7806 tree fns = TREE_OPERAND (decl, 0);
7809 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7811 gcc_assert (is_overloaded_fn (dname));
7812 dname = DECL_NAME (get_first_fn (dname));
7817 case IDENTIFIER_NODE:
7818 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7821 if (C_IS_RESERVED_WORD (dname))
7823 error ("declarator-id missing; using reserved word %qD",
7825 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7827 else if (!IDENTIFIER_TYPENAME_P (dname))
7828 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7831 gcc_assert (flags == NO_SPECIAL);
7832 flags = TYPENAME_FLAG;
7833 ctor_return_type = TREE_TYPE (dname);
7834 sfk = sfk_conversion;
7835 if (is_typename_at_global_scope (dname))
7836 name = identifier_to_locale (IDENTIFIER_POINTER (dname));
7838 name = "<invalid operator>";
7855 return error_mark_node;
7860 if (id_declarator->kind == cdk_id)
7866 The declarator in a function-definition shall have the form
7867 D1 ( parameter-declaration-clause) ... */
7868 if (funcdef_flag && innermost_code != cdk_function)
7870 error ("function definition does not declare parameters");
7871 return error_mark_node;
7874 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7875 && innermost_code != cdk_function
7876 && ! (ctype && !declspecs->any_specifiers_p))
7878 error ("declaration of %qD as non-function", dname);
7879 return error_mark_node;
7882 /* Anything declared one level down from the top level
7883 must be one of the parameters of a function
7884 (because the body is at least two levels down). */
7886 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7887 by not allowing C++ class definitions to specify their parameters
7888 with xdecls (must be spec.d in the parmlist).
7890 Since we now wait to push a class scope until we are sure that
7891 we are in a legitimate method context, we must set oldcname
7892 explicitly (since current_class_name is not yet alive).
7894 We also want to avoid calling this a PARM if it is in a namespace. */
7896 if (decl_context == NORMAL && !toplevel_bindings_p ())
7898 struct cp_binding_level *b = current_binding_level;
7899 current_binding_level = b->level_chain;
7900 if (current_binding_level != 0 && toplevel_bindings_p ())
7901 decl_context = PARM;
7902 current_binding_level = b;
7906 name = decl_context == PARM ? "parameter" : "type name";
7908 /* If there were multiple types specified in the decl-specifier-seq,
7909 issue an error message. */
7910 if (declspecs->multiple_types_p)
7912 error ("two or more data types in declaration of %qs", name);
7913 return error_mark_node;
7916 if (declspecs->conflicting_specifiers_p)
7918 error ("conflicting specifiers in declaration of %qs", name);
7919 return error_mark_node;
7922 /* Extract the basic type from the decl-specifier-seq. */
7923 type = declspecs->type;
7924 if (type == error_mark_node)
7927 type_was_error_mark_node = true;
7929 /* If the entire declaration is itself tagged as deprecated then
7930 suppress reports of deprecated items. */
7931 if (type && TREE_DEPRECATED (type)
7932 && deprecated_state != DEPRECATED_SUPPRESS)
7933 warn_deprecated_use (type, NULL_TREE);
7934 if (type && TREE_CODE (type) == TYPE_DECL)
7936 typedef_decl = type;
7937 type = TREE_TYPE (typedef_decl);
7938 if (TREE_DEPRECATED (type)
7939 && DECL_ARTIFICIAL (typedef_decl)
7940 && deprecated_state != DEPRECATED_SUPPRESS)
7941 warn_deprecated_use (type, NULL_TREE);
7943 /* No type at all: default to `int', and set DEFAULTED_INT
7944 because it was not a user-defined typedef. */
7945 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7947 /* These imply 'int'. */
7948 type = integer_type_node;
7952 explicit_int = declspecs->explicit_int_p;
7953 explicit_char = declspecs->explicit_char_p;
7956 /* See the code below that used this. */
7958 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7960 typedef_type = type;
7963 if (sfk != sfk_conversion)
7964 ctor_return_type = ctype;
7966 if (sfk != sfk_none)
7967 type = check_special_function_return_type (sfk, type,
7969 else if (type == NULL_TREE)
7975 /* We handle `main' specially here, because 'main () { }' is so
7976 common. With no options, it is allowed. With -Wreturn-type,
7977 it is a warning. It is only an error with -pedantic-errors. */
7978 is_main = (funcdef_flag
7979 && dname && MAIN_NAME_P (dname)
7980 && ctype == NULL_TREE
7981 && in_namespace == NULL_TREE
7982 && current_namespace == global_namespace);
7984 if (type_was_error_mark_node)
7985 /* We've already issued an error, don't complain more. */;
7986 else if (in_system_header || flag_ms_extensions)
7987 /* Allow it, sigh. */;
7989 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7991 pedwarn (input_location, OPT_pedantic,
7992 "ISO C++ forbids declaration of %qs with no type", name);
7994 warning (OPT_Wreturn_type,
7995 "ISO C++ forbids declaration of %qs with no type", name);
7997 type = integer_type_node;
8002 /* Now process the modifiers that were specified
8003 and check for invalid combinations. */
8005 /* Long double is a special combination. */
8006 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
8009 type = build_qualified_type (long_double_type_node,
8010 cp_type_quals (type));
8013 /* Check all other uses of type modifiers. */
8015 if (unsigned_p || signed_p || long_p || short_p)
8019 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
8020 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8021 else if (signed_p && unsigned_p)
8022 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
8023 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
8024 error ("%<long long%> invalid for %qs", name);
8025 else if (long_p && TREE_CODE (type) == REAL_TYPE)
8026 error ("%<long%> invalid for %qs", name);
8027 else if (short_p && TREE_CODE (type) == REAL_TYPE)
8028 error ("%<short%> invalid for %qs", name);
8029 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
8030 error ("%<long%> or %<short%> invalid for %qs", name);
8031 else if ((long_p || short_p) && explicit_char)
8032 error ("%<long%> or %<short%> specified with char for %qs", name);
8033 else if (long_p && short_p)
8034 error ("%<long%> and %<short%> specified together for %qs", name);
8035 else if (type == char16_type_node || type == char32_type_node)
8037 if (signed_p || unsigned_p)
8038 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
8039 else if (short_p || long_p)
8040 error ("%<short%> or %<long%> invalid for %qs", name);
8045 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
8047 pedwarn (input_location, OPT_pedantic,
8048 "long, short, signed or unsigned used invalidly for %qs",
8050 if (flag_pedantic_errors)
8055 /* Discard the type modifiers if they are invalid. */
8066 /* Decide whether an integer type is signed or not.
8067 Optionally treat bitfields as signed by default. */
8071 It is implementation-defined whether a plain (neither
8072 explicitly signed or unsigned) char, short, int, or long
8073 bit-field is signed or unsigned.
8075 Naturally, we extend this to long long as well. Note that
8076 this does not include wchar_t. */
8077 || (bitfield && !flag_signed_bitfields
8079 /* A typedef for plain `int' without `signed' can be
8080 controlled just like plain `int', but a typedef for
8081 `signed int' cannot be so controlled. */
8083 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
8084 && TREE_CODE (type) == INTEGER_TYPE
8085 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
8088 type = long_long_unsigned_type_node;
8090 type = long_unsigned_type_node;
8092 type = short_unsigned_type_node;
8093 else if (type == char_type_node)
8094 type = unsigned_char_type_node;
8095 else if (typedef_decl)
8096 type = unsigned_type_for (type);
8098 type = unsigned_type_node;
8100 else if (signed_p && type == char_type_node)
8101 type = signed_char_type_node;
8103 type = long_long_integer_type_node;
8105 type = long_integer_type_node;
8107 type = short_integer_type_node;
8109 if (declspecs->specs[(int)ds_complex])
8111 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
8112 error ("complex invalid for %qs", name);
8113 /* If we just have "complex", it is equivalent to
8114 "complex double", but if any modifiers at all are specified it is
8115 the complex form of TYPE. E.g, "complex short" is
8116 "complex short int". */
8118 else if (defaulted_int && ! longlong
8119 && ! (long_p || short_p || signed_p || unsigned_p))
8120 type = complex_double_type_node;
8121 else if (type == integer_type_node)
8122 type = complex_integer_type_node;
8123 else if (type == float_type_node)
8124 type = complex_float_type_node;
8125 else if (type == double_type_node)
8126 type = complex_double_type_node;
8127 else if (type == long_double_type_node)
8128 type = complex_long_double_type_node;
8130 type = build_complex_type (type);
8133 type_quals = TYPE_UNQUALIFIED;
8134 if (declspecs->specs[(int)ds_const])
8135 type_quals |= TYPE_QUAL_CONST;
8136 /* A `constexpr' specifier used in an object declaration declares
8137 the object as `const'. */
8140 if (innermost_code == cdk_function)
8142 else if (declspecs->specs[(int)ds_const] != 0)
8143 error ("both %<const%> and %<constexpr%> cannot be used here");
8145 type_quals |= TYPE_QUAL_CONST;
8147 if (declspecs->specs[(int)ds_volatile])
8148 type_quals |= TYPE_QUAL_VOLATILE;
8149 if (declspecs->specs[(int)ds_restrict])
8150 type_quals |= TYPE_QUAL_RESTRICT;
8151 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8152 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8155 if (TREE_CODE (type) == FUNCTION_TYPE
8156 && type_quals != TYPE_UNQUALIFIED)
8158 /* This was an error in C++98 (cv-qualifiers cannot be added to
8159 a function type), but DR 295 makes the code well-formed by
8160 dropping the extra qualifiers. */
8163 tree bad_type = build_qualified_type (type, type_quals);
8164 pedwarn (input_location, OPT_pedantic,
8165 "ignoring %qV qualifiers added to function type %qT",
8168 type_quals = TYPE_UNQUALIFIED;
8170 type_quals |= cp_type_quals (type);
8171 type = cp_build_qualified_type_real
8172 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8173 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8174 /* We might have ignored or rejected some of the qualifiers. */
8175 type_quals = cp_type_quals (type);
8178 inlinep = !! declspecs->specs[(int)ds_inline];
8179 virtualp = !! declspecs->specs[(int)ds_virtual];
8180 explicitp = !! declspecs->specs[(int)ds_explicit];
8182 storage_class = declspecs->storage_class;
8183 if (storage_class == sc_static)
8184 staticp = 1 + (decl_context == FIELD);
8186 if (virtualp && staticp == 2)
8188 error ("member %qD cannot be declared both virtual and static", dname);
8189 storage_class = sc_none;
8192 friendp = !! declspecs->specs[(int)ds_friend];
8194 if (dependent_name && !friendp)
8196 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8197 return error_mark_node;
8200 /* Issue errors about use of storage classes for parameters. */
8201 if (decl_context == PARM)
8203 if (declspecs->specs[(int)ds_typedef])
8205 error ("typedef declaration invalid in parameter declaration");
8206 return error_mark_node;
8208 else if (template_parm_flag && storage_class != sc_none)
8210 error ("storage class specified for template parameter %qs", name);
8211 return error_mark_node;
8213 else if (storage_class == sc_static
8214 || storage_class == sc_extern
8216 error ("storage class specifiers invalid in parameter declarations");
8218 if (type_uses_auto (type))
8220 error ("parameter declared %<auto%>");
8221 type = error_mark_node;
8224 /* Function parameters cannot be constexpr. If we saw one, moan
8225 and pretend it wasn't there. */
8228 error ("a parameter cannot be declared %<constexpr%>");
8233 /* Give error if `virtual' is used outside of class declaration. */
8235 && (current_class_name == NULL_TREE || decl_context != FIELD))
8237 error ("%<virtual%> outside class declaration");
8241 /* Static anonymous unions are dealt with here. */
8242 if (staticp && decl_context == TYPENAME
8244 && ANON_AGGR_TYPE_P (declspecs->type))
8245 decl_context = FIELD;
8247 /* Warn about storage classes that are invalid for certain
8248 kinds of declarations (parameters, typenames, etc.). */
8251 && storage_class != sc_extern
8252 && storage_class != sc_static)
8253 || declspecs->specs[(int)ds_typedef]))
8255 error ("multiple storage classes in declaration of %qs", name);
8258 if (decl_context != NORMAL
8259 && ((storage_class != sc_none
8260 && storage_class != sc_mutable)
8263 if ((decl_context == PARM || decl_context == CATCHPARM)
8264 && (storage_class == sc_register
8265 || storage_class == sc_auto))
8267 else if (declspecs->specs[(int)ds_typedef])
8269 else if (decl_context == FIELD
8270 /* C++ allows static class elements. */
8271 && storage_class == sc_static)
8272 /* C++ also allows inlines and signed and unsigned elements,
8273 but in those cases we don't come in here. */
8277 if (decl_context == FIELD)
8278 error ("storage class specified for %qs", name);
8281 if (decl_context == PARM || decl_context == CATCHPARM)
8282 error ("storage class specified for parameter %qs", name);
8284 error ("storage class specified for typename");
8286 if (storage_class == sc_register
8287 || storage_class == sc_auto
8288 || storage_class == sc_extern
8290 storage_class = sc_none;
8293 else if (storage_class == sc_extern && funcdef_flag
8294 && ! toplevel_bindings_p ())
8295 error ("nested function %qs declared %<extern%>", name);
8296 else if (toplevel_bindings_p ())
8298 if (storage_class == sc_auto)
8299 error ("top-level declaration of %qs specifies %<auto%>", name);
8302 && storage_class != sc_extern
8303 && storage_class != sc_static)
8305 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8310 if (storage_class && friendp)
8312 error ("storage class specifiers invalid in friend function declarations");
8313 storage_class = sc_none;
8318 unqualified_id = NULL_TREE;
8321 unqualified_id = id_declarator->u.id.unqualified_name;
8322 switch (TREE_CODE (unqualified_id))
8325 unqualified_id = TREE_OPERAND (unqualified_id, 0);
8326 if (TYPE_P (unqualified_id))
8327 unqualified_id = constructor_name (unqualified_id);
8330 case IDENTIFIER_NODE:
8331 case TEMPLATE_ID_EXPR:
8339 /* Determine the type of the entity declared by recurring on the
8341 for (; declarator; declarator = declarator->declarator)
8343 const cp_declarator *inner_declarator;
8346 if (type == error_mark_node)
8347 return error_mark_node;
8349 attrs = declarator->attributes;
8355 if (declarator == NULL || declarator->kind == cdk_id)
8356 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8357 if (declarator->kind == cdk_function)
8358 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8359 if (declarator->kind == cdk_array)
8360 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8361 returned_attrs = decl_attributes (&type,
8362 chainon (returned_attrs, attrs),
8366 if (declarator->kind == cdk_id)
8369 inner_declarator = declarator->declarator;
8371 switch (declarator->kind)
8374 type = create_array_type_for_decl (dname, type,
8375 declarator->u.array.bounds);
8383 /* Declaring a function type.
8384 Make sure we have a valid type for the function to return. */
8386 if (type_quals != TYPE_UNQUALIFIED)
8388 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8389 warning (OPT_Wignored_qualifiers,
8390 "type qualifiers ignored on function return type");
8391 /* We now know that the TYPE_QUALS don't apply to the
8392 decl, but to its return type. */
8393 type_quals = TYPE_UNQUALIFIED;
8395 errmsg = targetm.invalid_return_type (type);
8399 type = integer_type_node;
8402 /* Error about some types functions can't return. */
8404 if (TREE_CODE (type) == FUNCTION_TYPE)
8406 error ("%qs declared as function returning a function", name);
8407 return error_mark_node;
8409 if (TREE_CODE (type) == ARRAY_TYPE)
8411 error ("%qs declared as function returning an array", name);
8412 return error_mark_node;
8415 /* Pick up type qualifiers which should be applied to `this'. */
8416 memfn_quals = declarator->u.function.qualifiers;
8418 /* Pick up the exception specifications. */
8419 raises = declarator->u.function.exception_specification;
8421 /* Say it's a definition only for the CALL_EXPR
8422 closest to the identifier. */
8423 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8425 /* Handle a late-specified return type. */
8428 if (type_uses_auto (type))
8430 if (!declarator->u.function.late_return_type)
8432 error ("%qs function uses %<auto%> type specifier without"
8433 " late return type", name);
8434 return error_mark_node;
8436 else if (!is_auto (type))
8438 error ("%qs function with late return type has"
8439 " %qT as its type rather than plain %<auto%>",
8441 return error_mark_node;
8444 else if (declarator->u.function.late_return_type)
8446 error ("%qs function with late return type not declared"
8447 " with %<auto%> type specifier", name);
8448 return error_mark_node;
8451 type = splice_late_return_type
8452 (type, declarator->u.function.late_return_type);
8453 if (type == error_mark_node)
8454 return error_mark_node;
8456 if (ctype == NULL_TREE
8457 && decl_context == FIELD
8459 && (friendp == 0 || dname == current_class_name))
8460 ctype = current_class_type;
8462 if (ctype && (sfk == sfk_constructor
8463 || sfk == sfk_destructor))
8465 /* We are within a class's scope. If our declarator name
8466 is the same as the class name, and we are defining
8467 a function, then it is a constructor/destructor, and
8468 therefore returns a void type. */
8470 /* ISO C++ 12.4/2. A destructor may not be declared
8471 const or volatile. A destructor may not be
8474 ISO C++ 12.1. A constructor may not be declared
8475 const or volatile. A constructor may not be
8476 virtual. A constructor may not be static. */
8478 error ((flags == DTOR_FLAG)
8479 ? "destructor cannot be static member function"
8480 : "constructor cannot be static member function");
8483 error ((flags == DTOR_FLAG)
8484 ? "destructors may not be cv-qualified"
8485 : "constructors may not be cv-qualified");
8486 memfn_quals = TYPE_UNQUALIFIED;
8489 if (decl_context == FIELD
8490 && !member_function_or_else (ctype,
8493 return error_mark_node;
8495 if (flags != DTOR_FLAG)
8497 /* It's a constructor. */
8502 permerror (input_location, "constructors cannot be declared virtual");
8505 if (decl_context == FIELD
8506 && sfk != sfk_constructor)
8507 return error_mark_node;
8509 if (decl_context == FIELD)
8515 error ("can't initialize friend function %qs", name);
8518 /* Cannot be both friend and virtual. */
8519 error ("virtual functions cannot be friends");
8522 if (decl_context == NORMAL)
8523 error ("friend declaration not in class definition");
8524 if (current_function_decl && funcdef_flag)
8525 error ("can't define friend function %qs in a local "
8529 else if (ctype && sfk == sfk_conversion)
8533 maybe_warn_cpp0x (CPP0X_EXPLICIT_CONVERSION);
8538 /* It is not allowed to use `constexpr' in a function
8539 declaration that is not a definition.
8540 That is too strict, though. */
8541 if (constexpr_p && !funcdef_flag)
8543 error ("the %<constexpr%> specifier cannot be used in "
8544 "a function declaration that is not a definition");
8545 constexpr_p = false;
8548 /* A constexpr non-static member function is implicitly const. */
8549 if (constexpr_p && decl_context == FIELD && staticp == 0
8550 && sfk != sfk_constructor && sfk != sfk_destructor)
8551 memfn_quals |= TYPE_QUAL_CONST;
8553 arg_types = grokparms (declarator->u.function.parameters,
8556 if (inner_declarator
8557 && inner_declarator->kind == cdk_id
8558 && inner_declarator->u.id.sfk == sfk_destructor
8559 && arg_types != void_list_node)
8561 error ("destructors may not have parameters");
8562 arg_types = void_list_node;
8566 type = build_function_type (type, arg_types);
8573 /* Filter out pointers-to-references and references-to-references.
8574 We can get these if a TYPE_DECL is used. */
8576 if (TREE_CODE (type) == REFERENCE_TYPE)
8578 if (declarator->kind != cdk_reference)
8580 error ("cannot declare pointer to %q#T", type);
8581 type = TREE_TYPE (type);
8584 /* In C++0x, we allow reference to reference declarations
8585 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8586 and template type arguments [14.3.1/4 temp.arg.type]. The
8587 check for direct reference to reference declarations, which
8588 are still forbidden, occurs below. Reasoning behind the change
8589 can be found in DR106, DR540, and the rvalue reference
8591 else if (cxx_dialect == cxx98)
8593 error ("cannot declare reference to %q#T", type);
8594 type = TREE_TYPE (type);
8597 else if (VOID_TYPE_P (type))
8599 if (declarator->kind == cdk_reference)
8600 error ("cannot declare reference to %q#T", type);
8601 else if (declarator->kind == cdk_ptrmem)
8602 error ("cannot declare pointer to %q#T member", type);
8605 /* We now know that the TYPE_QUALS don't apply to the decl,
8606 but to the target of the pointer. */
8607 type_quals = TYPE_UNQUALIFIED;
8609 if (declarator->kind == cdk_ptrmem
8610 && (TREE_CODE (type) == FUNCTION_TYPE
8611 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8613 memfn_quals |= cp_type_quals (type);
8614 type = build_memfn_type (type,
8615 declarator->u.pointer.class_type,
8617 memfn_quals = TYPE_UNQUALIFIED;
8620 if (TREE_CODE (type) == FUNCTION_TYPE
8621 && cp_type_quals (type) != TYPE_UNQUALIFIED)
8622 error ("cannot declare %s to qualified function type %qT",
8623 declarator->kind == cdk_reference ? "reference" : "pointer",
8626 if (declarator->kind == cdk_reference)
8628 /* In C++0x, the type we are creating a reference to might be
8629 a typedef which is itself a reference type. In that case,
8630 we follow the reference collapsing rules in
8631 [7.1.3/8 dcl.typedef] to create the final reference type:
8633 "If a typedef TD names a type that is a reference to a type
8634 T, an attempt to create the type 'lvalue reference to cv TD'
8635 creates the type 'lvalue reference to T,' while an attempt
8636 to create the type "rvalue reference to cv TD' creates the
8639 if (!VOID_TYPE_P (type))
8640 type = cp_build_reference_type
8641 ((TREE_CODE (type) == REFERENCE_TYPE
8642 ? TREE_TYPE (type) : type),
8643 (declarator->u.reference.rvalue_ref
8644 && (TREE_CODE(type) != REFERENCE_TYPE
8645 || TYPE_REF_IS_RVALUE (type))));
8647 /* In C++0x, we need this check for direct reference to
8648 reference declarations, which are forbidden by
8649 [8.3.2/5 dcl.ref]. Reference to reference declarations
8650 are only allowed indirectly through typedefs and template
8651 type arguments. Example:
8653 void foo(int & &); // invalid ref-to-ref decl
8655 typedef int & int_ref;
8656 void foo(int_ref &); // valid ref-to-ref decl
8658 if (inner_declarator && inner_declarator->kind == cdk_reference)
8659 error ("cannot declare reference to %q#T, which is not "
8660 "a typedef or a template type argument", type);
8662 else if (TREE_CODE (type) == METHOD_TYPE)
8663 type = build_ptrmemfunc_type (build_pointer_type (type));
8664 else if (declarator->kind == cdk_ptrmem)
8666 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8668 if (declarator->u.pointer.class_type == error_mark_node)
8669 /* We will already have complained. */
8670 type = error_mark_node;
8672 type = build_ptrmem_type (declarator->u.pointer.class_type,
8676 type = build_pointer_type (type);
8678 /* Process a list of type modifier keywords (such as
8679 const or volatile) that were given inside the `*' or `&'. */
8681 if (declarator->u.pointer.qualifiers)
8684 = cp_build_qualified_type (type,
8685 declarator->u.pointer.qualifiers);
8686 type_quals = cp_type_quals (type);
8699 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8700 && TREE_CODE (type) != FUNCTION_TYPE
8701 && TREE_CODE (type) != METHOD_TYPE)
8703 error ("template-id %qD used as a declarator",
8705 unqualified_id = dname;
8708 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8709 qualified with a class-name, turn it into a METHOD_TYPE, unless
8710 we know that the function is static. We take advantage of this
8711 opportunity to do other processing that pertains to entities
8712 explicitly declared to be class members. Note that if DECLARATOR
8713 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8714 would not have exited the loop above. */
8716 && declarator->u.id.qualifying_scope
8717 && TYPE_P (declarator->u.id.qualifying_scope))
8721 ctype = declarator->u.id.qualifying_scope;
8722 ctype = TYPE_MAIN_VARIANT (ctype);
8724 while (t != NULL_TREE && CLASS_TYPE_P (t))
8726 /* You're supposed to have one `template <...>' for every
8727 template class, but you don't need one for a full
8728 specialization. For example:
8730 template <class T> struct S{};
8731 template <> struct S<int> { void f(); };
8732 void S<int>::f () {}
8734 is correct; there shouldn't be a `template <>' for the
8735 definition of `S<int>::f'. */
8736 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8737 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8738 /* T is an explicit (not partial) specialization. All
8739 containing classes must therefore also be explicitly
8742 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8743 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8744 template_count += 1;
8746 t = TYPE_MAIN_DECL (t);
8747 t = DECL_CONTEXT (t);
8750 if (ctype == current_class_type)
8754 permerror (input_location, "member functions are implicitly friends of their class");
8758 permerror (declarator->id_loc,
8759 "extra qualification %<%T::%> on member %qs",
8762 else if (/* If the qualifying type is already complete, then we
8763 can skip the following checks. */
8764 !COMPLETE_TYPE_P (ctype)
8765 && (/* If the function is being defined, then
8766 qualifying type must certainly be complete. */
8768 /* A friend declaration of "T::f" is OK, even if
8769 "T" is a template parameter. But, if this
8770 function is not a friend, the qualifying type
8772 || (!friendp && !CLASS_TYPE_P (ctype))
8773 /* For a declaration, the type need not be
8774 complete, if either it is dependent (since there
8775 is no meaningful definition of complete in that
8776 case) or the qualifying class is currently being
8778 || !(dependent_type_p (ctype)
8779 || currently_open_class (ctype)))
8780 /* Check that the qualifying type is complete. */
8781 && !complete_type_or_else (ctype, NULL_TREE))
8782 return error_mark_node;
8783 else if (TREE_CODE (type) == FUNCTION_TYPE)
8785 tree sname = declarator->u.id.unqualified_name;
8787 if (current_class_type
8788 && (!friendp || funcdef_flag))
8791 ? "cannot define member function %<%T::%s%> within %<%T%>"
8792 : "cannot declare member function %<%T::%s%> within %<%T%>",
8793 ctype, name, current_class_type);
8794 return error_mark_node;
8797 /* It is not permitted to define a member function outside ist
8798 membership class as `constexpr'. */
8800 error ("a constexpr function cannot be defined "
8801 "outside of its class");
8803 if (TREE_CODE (sname) == IDENTIFIER_NODE
8804 && NEW_DELETE_OPNAME_P (sname))
8805 /* Overloaded operator new and operator delete
8806 are always static functions. */
8809 type = build_memfn_type (type, ctype, memfn_quals);
8811 else if (declspecs->specs[(int)ds_typedef]
8812 && current_class_type)
8814 error ("cannot declare member %<%T::%s%> within %qT",
8815 ctype, name, current_class_type);
8816 return error_mark_node;
8820 /* Now TYPE has the actual type. */
8825 *attrlist = chainon (returned_attrs, *attrlist);
8827 attrlist = &returned_attrs;
8830 /* Handle parameter packs. */
8831 if (parameter_pack_p)
8833 if (decl_context == PARM)
8834 /* Turn the type into a pack expansion.*/
8835 type = make_pack_expansion (type);
8837 error ("non-parameter %qs cannot be a parameter pack", name);
8840 /* Did array size calculations overflow? */
8842 if (TREE_CODE (type) == ARRAY_TYPE
8843 && COMPLETE_TYPE_P (type)
8844 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8845 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8847 error ("size of array %qs is too large", name);
8848 /* If we proceed with the array type as it is, we'll eventually
8849 crash in tree_low_cst(). */
8850 type = error_mark_node;
8853 if ((decl_context == FIELD || decl_context == PARM)
8854 && !processing_template_decl
8855 && variably_modified_type_p (type, NULL_TREE))
8857 if (decl_context == FIELD)
8858 error ("data member may not have variably modified type %qT", type);
8860 error ("parameter may not have variably modified type %qT", type);
8861 type = error_mark_node;
8864 if (explicitp == 1 || (explicitp && friendp))
8866 /* [dcl.fct.spec] The explicit specifier shall only be used in
8867 declarations of constructors within a class definition. */
8868 error ("only declarations of constructors can be %<explicit%>");
8872 if (storage_class == sc_mutable)
8874 if (decl_context != FIELD || friendp)
8876 error ("non-member %qs cannot be declared %<mutable%>", name);
8877 storage_class = sc_none;
8879 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8881 error ("non-object member %qs cannot be declared %<mutable%>", name);
8882 storage_class = sc_none;
8884 else if (TREE_CODE (type) == FUNCTION_TYPE
8885 || TREE_CODE (type) == METHOD_TYPE)
8887 error ("function %qs cannot be declared %<mutable%>", name);
8888 storage_class = sc_none;
8892 error ("static %qs cannot be declared %<mutable%>", name);
8893 storage_class = sc_none;
8895 else if (type_quals & TYPE_QUAL_CONST)
8897 error ("const %qs cannot be declared %<mutable%>", name);
8898 storage_class = sc_none;
8902 /* If this is declaring a typedef name, return a TYPE_DECL. */
8903 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8907 /* Note that the grammar rejects storage classes
8908 in typenames, fields or parameters. */
8909 if (current_lang_name == lang_name_java)
8910 TYPE_FOR_JAVA (type) = 1;
8912 /* This declaration:
8914 typedef void f(int) const;
8916 declares a function type which is not a member of any
8917 particular class, but which is cv-qualified; for
8918 example "f S::*" declares a pointer to a const-qualified
8919 member function of S. We record the cv-qualification in the
8921 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8923 type = cp_build_qualified_type (type, memfn_quals);
8925 /* We have now dealt with these qualifiers. */
8926 memfn_quals = TYPE_UNQUALIFIED;
8929 if (decl_context == FIELD)
8930 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8932 decl = build_decl (input_location, TYPE_DECL, unqualified_id, type);
8933 if (id_declarator && declarator->u.id.qualifying_scope) {
8934 error_at (DECL_SOURCE_LOCATION (decl),
8935 "typedef name may not be a nested-name-specifier");
8936 TREE_TYPE (decl) = error_mark_node;
8939 if (decl_context != FIELD)
8941 if (!current_function_decl)
8942 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8943 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8944 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8945 (current_function_decl)))
8946 /* The TYPE_DECL is "abstract" because there will be
8947 clones of this constructor/destructor, and there will
8948 be copies of this TYPE_DECL generated in those
8950 DECL_ABSTRACT (decl) = 1;
8952 else if (constructor_name_p (unqualified_id, current_class_type))
8953 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8954 "as enclosing class",
8957 /* If the user declares "typedef struct {...} foo" then the
8958 struct will have an anonymous name. Fill that name in now.
8959 Nothing can refer to it, so nothing needs know about the name
8961 if (type != error_mark_node
8964 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8965 && TYPE_ANONYMOUS_P (type)
8966 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8970 /* Replace the anonymous name with the real name everywhere. */
8971 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8973 if (ANON_AGGRNAME_P (TYPE_IDENTIFIER (t)))
8975 debug_hooks->set_name (t, decl);
8976 TYPE_NAME (t) = decl;
8980 if (TYPE_LANG_SPECIFIC (type))
8981 TYPE_WAS_ANONYMOUS (type) = 1;
8983 /* If this is a typedef within a template class, the nested
8984 type is a (non-primary) template. The name for the
8985 template needs updating as well. */
8986 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8987 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8988 = TYPE_IDENTIFIER (type);
8990 /* Adjust linkage now that we aren't anonymous anymore. */
8991 set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
8992 determine_visibility (TYPE_MAIN_DECL (type));
8994 /* FIXME remangle member functions; member functions of a
8995 type with external linkage have external linkage. */
8999 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
9000 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
9002 bad_specifiers (decl, "type", virtualp,
9003 memfn_quals != TYPE_UNQUALIFIED,
9004 inlinep, friendp, raises != NULL_TREE);
9009 /* Detect the case of an array type of unspecified size
9010 which came, as such, direct from a typedef name.
9011 We must copy the type, so that the array's domain can be
9012 individually set by the object's initializer. */
9014 if (type && typedef_type
9015 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
9016 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
9017 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
9019 /* Detect where we're using a typedef of function type to declare a
9020 function. PARMS will not be set, so we must create it now. */
9022 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
9024 tree decls = NULL_TREE;
9027 for (args = TYPE_ARG_TYPES (type);
9028 args && args != void_list_node;
9029 args = TREE_CHAIN (args))
9031 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
9033 TREE_CHAIN (decl) = decls;
9037 parms = nreverse (decls);
9039 if (decl_context != TYPENAME)
9041 /* A cv-qualifier-seq shall only be part of the function type
9042 for a non-static member function. [8.3.5/4 dcl.fct] */
9043 if (cp_type_quals (type) != TYPE_UNQUALIFIED
9044 && (current_class_type == NULL_TREE || staticp) )
9047 ? G_("qualified function types cannot be used to "
9048 "declare static member functions")
9049 : G_("qualified function types cannot be used to "
9050 "declare free functions"));
9051 type = TYPE_MAIN_VARIANT (type);
9054 /* The qualifiers on the function type become the qualifiers on
9055 the non-static member function. */
9056 memfn_quals |= cp_type_quals (type);
9060 /* If this is a type name (such as, in a cast or sizeof),
9061 compute the type and return it now. */
9063 if (decl_context == TYPENAME)
9065 /* Note that the grammar rejects storage classes
9066 in typenames, fields or parameters. */
9067 if (type_quals != TYPE_UNQUALIFIED)
9068 type_quals = TYPE_UNQUALIFIED;
9070 /* Special case: "friend class foo" looks like a TYPENAME context. */
9073 if (type_quals != TYPE_UNQUALIFIED)
9075 error ("type qualifiers specified for friend class declaration");
9076 type_quals = TYPE_UNQUALIFIED;
9080 error ("%<inline%> specified for friend class declaration");
9086 /* Don't allow friend declaration without a class-key. */
9087 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
9088 permerror (input_location, "template parameters cannot be friends");
9089 else if (TREE_CODE (type) == TYPENAME_TYPE)
9090 permerror (input_location, "friend declaration requires class-key, "
9091 "i.e. %<friend class %T::%D%>",
9092 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
9094 permerror (input_location, "friend declaration requires class-key, "
9095 "i.e. %<friend %#T%>",
9099 /* Only try to do this stuff if we didn't already give up. */
9100 if (type != integer_type_node)
9102 /* A friendly class? */
9103 if (current_class_type)
9104 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
9107 error ("trying to make class %qT a friend of global scope",
9110 type = void_type_node;
9113 else if (memfn_quals)
9115 if (ctype == NULL_TREE
9116 && TREE_CODE (type) == METHOD_TYPE)
9117 ctype = TYPE_METHOD_BASETYPE (type);
9120 type = build_memfn_type (type, ctype, memfn_quals);
9121 /* Core issue #547: need to allow this in template type args. */
9122 else if (template_type_arg && TREE_CODE (type) == FUNCTION_TYPE)
9123 type = cp_build_qualified_type (type, memfn_quals);
9125 error ("invalid qualifiers on non-member function type");
9130 else if (unqualified_id == NULL_TREE && decl_context != PARM
9131 && decl_context != CATCHPARM
9132 && TREE_CODE (type) != UNION_TYPE
9135 error ("abstract declarator %qT used as declaration", type);
9136 return error_mark_node;
9139 /* Only functions may be declared using an operator-function-id. */
9141 && IDENTIFIER_OPNAME_P (unqualified_id)
9142 && TREE_CODE (type) != FUNCTION_TYPE
9143 && TREE_CODE (type) != METHOD_TYPE)
9145 error ("declaration of %qD as non-function", unqualified_id);
9146 return error_mark_node;
9149 /* We don't check parameter types here because we can emit a better
9150 error message later. */
9151 if (decl_context != PARM)
9153 type = check_var_type (unqualified_id, type);
9154 if (type == error_mark_node)
9155 return error_mark_node;
9158 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
9159 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
9161 if (decl_context == PARM || decl_context == CATCHPARM)
9163 if (ctype || in_namespace)
9164 error ("cannot use %<::%> in parameter declaration");
9166 /* A parameter declared as an array of T is really a pointer to T.
9167 One declared as a function is really a pointer to a function.
9168 One declared as a member is really a pointer to member. */
9170 if (TREE_CODE (type) == ARRAY_TYPE)
9172 /* Transfer const-ness of array into that of type pointed to. */
9173 type = build_pointer_type (TREE_TYPE (type));
9174 type_quals = TYPE_UNQUALIFIED;
9176 else if (TREE_CODE (type) == FUNCTION_TYPE)
9177 type = build_pointer_type (type);
9183 if (decl_context == PARM)
9185 decl = cp_build_parm_decl (unqualified_id, type);
9187 bad_specifiers (decl, "parameter", virtualp,
9188 memfn_quals != TYPE_UNQUALIFIED,
9189 inlinep, friendp, raises != NULL_TREE);
9191 else if (decl_context == FIELD)
9193 /* The C99 flexible array extension. */
9194 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
9195 && TYPE_DOMAIN (type) == NULL_TREE)
9197 tree itype = compute_array_index_type (dname, integer_zero_node);
9198 type = build_cplus_array_type (TREE_TYPE (type), itype);
9201 if (type == error_mark_node)
9203 /* Happens when declaring arrays of sizes which
9204 are error_mark_node, for example. */
9207 else if (in_namespace && !friendp)
9209 /* Something like struct S { int N::j; }; */
9210 error ("invalid use of %<::%>");
9211 return error_mark_node;
9213 else if (TREE_CODE (type) == FUNCTION_TYPE)
9216 tree function_context;
9220 if (ctype == NULL_TREE)
9221 ctype = current_class_type;
9223 if (ctype == NULL_TREE)
9225 error ("can't make %qD into a method -- not in a class",
9227 return error_mark_node;
9230 /* ``A union may [ ... ] not [ have ] virtual functions.''
9232 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9234 error ("function %qD declared virtual inside a union",
9236 return error_mark_node;
9239 if (NEW_DELETE_OPNAME_P (unqualified_id))
9243 error ("%qD cannot be declared virtual, since it "
9249 else if (staticp < 2)
9250 type = build_memfn_type (type, ctype, memfn_quals);
9253 /* Check that the name used for a destructor makes sense. */
9254 if (sfk == sfk_destructor)
9256 tree uqname = id_declarator->u.id.unqualified_name;
9260 gcc_assert (friendp);
9261 error ("expected qualified name in friend declaration "
9262 "for destructor %qD", uqname);
9263 return error_mark_node;
9266 if (!check_dtor_name (ctype, TREE_OPERAND (uqname, 0)))
9268 error ("declaration of %qD as member of %qT",
9270 return error_mark_node;
9273 error ("a destructor cannot be %<constexpr%>");
9275 else if (sfk == sfk_constructor && friendp)
9277 error ("expected qualified name in friend declaration "
9278 "for constructor %qD",
9279 id_declarator->u.id.unqualified_name);
9280 return error_mark_node;
9283 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9284 function_context = (ctype != NULL_TREE) ?
9285 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9286 publicp = (! friendp || ! staticp)
9287 && function_context == NULL_TREE;
9288 decl = grokfndecl (ctype, type,
9289 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9290 ? unqualified_id : dname,
9293 virtualp, flags, memfn_quals, raises,
9294 friendp ? -1 : 0, friendp, publicp,
9295 inlinep || constexpr_p,
9297 funcdef_flag, template_count, in_namespace,
9298 attrlist, declarator->id_loc);
9299 if (decl == NULL_TREE)
9300 return error_mark_node;
9302 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9303 /* The decl and setting of decl_attr is also turned off. */
9304 decl = build_decl_attribute_variant (decl, decl_attr);
9307 /* [class.conv.ctor]
9309 A constructor declared without the function-specifier
9310 explicit that can be called with a single parameter
9311 specifies a conversion from the type of its first
9312 parameter to the type of its class. Such a constructor
9313 is called a converting constructor. */
9315 DECL_NONCONVERTING_P (decl) = 1;
9317 else if (TREE_CODE (type) == METHOD_TYPE)
9319 /* We only get here for friend declarations of
9320 members of other classes. */
9321 /* All method decls are public, so tell grokfndecl to set
9322 TREE_PUBLIC, also. */
9323 decl = grokfndecl (ctype, type,
9324 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9325 ? unqualified_id : dname,
9328 virtualp, flags, memfn_quals, raises,
9329 friendp ? -1 : 0, friendp, 1, 0, sfk,
9330 funcdef_flag, template_count, in_namespace,
9332 declarator->id_loc);
9333 if (decl == NULL_TREE)
9334 return error_mark_node;
9336 else if (!staticp && !dependent_type_p (type)
9337 && !COMPLETE_TYPE_P (complete_type (type))
9338 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9341 error ("field %qD has incomplete type", unqualified_id);
9343 error ("name %qT has incomplete type", type);
9345 /* If we're instantiating a template, tell them which
9346 instantiation made the field's type be incomplete. */
9347 if (current_class_type
9348 && TYPE_NAME (current_class_type)
9349 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9351 && declspecs->type == type)
9352 error (" in instantiation of template %qT",
9353 current_class_type);
9355 return error_mark_node;
9361 error ("%qE is neither function nor member function; "
9362 "cannot be declared friend", unqualified_id);
9370 /* Friends are treated specially. */
9371 if (ctype == current_class_type)
9372 ; /* We already issued a permerror. */
9373 else if (decl && DECL_NAME (decl))
9375 if (template_class_depth (current_class_type) == 0)
9377 decl = check_explicit_specialization
9378 (unqualified_id, decl, template_count,
9379 2 * funcdef_flag + 4);
9380 if (decl == error_mark_node)
9381 return error_mark_node;
9384 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9385 decl = do_friend (ctype, unqualified_id, decl,
9391 return error_mark_node;
9394 /* Structure field. It may not be a function, except for C++. */
9396 if (decl == NULL_TREE)
9402 /* An attempt is being made to initialize a non-static
9403 member. But, from [class.mem]:
9405 4 A member-declarator can contain a
9406 constant-initializer only if it declares a static
9407 member (_class.static_) of integral or enumeration
9408 type, see _class.static.data_.
9410 This used to be relatively common practice, but
9411 the rest of the compiler does not correctly
9412 handle the initialization unless the member is
9413 static so we make it static below. */
9414 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9416 permerror (input_location, "making %qD static", unqualified_id);
9420 if (uses_template_parms (type))
9421 /* We'll check at instantiation time. */
9423 else if (check_static_variable_definition (unqualified_id,
9425 /* If we just return the declaration, crashes
9426 will sometimes occur. We therefore return
9427 void_type_node, as if this was a friend
9428 declaration, to cause callers to completely
9429 ignore this declaration. */
9430 return error_mark_node;
9435 /* C++ allows static class members. All other work
9436 for this is done by grokfield. */
9437 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9438 set_linkage_for_static_data_member (decl);
9439 /* Even if there is an in-class initialization, DECL
9440 is considered undefined until an out-of-class
9441 definition is provided. */
9442 DECL_EXTERNAL (decl) = 1;
9445 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9450 error ("non-static data member %qE declared %<constexpr%>",
9452 decl = build_decl (input_location,
9453 FIELD_DECL, unqualified_id, type);
9454 DECL_NONADDRESSABLE_P (decl) = bitfield;
9455 if (bitfield && !unqualified_id)
9456 TREE_NO_WARNING (decl) = 1;
9458 if (storage_class == sc_mutable)
9460 DECL_MUTABLE_P (decl) = 1;
9461 storage_class = sc_none;
9465 bad_specifiers (decl, "field", virtualp,
9466 memfn_quals != TYPE_UNQUALIFIED,
9467 inlinep, friendp, raises != NULL_TREE);
9470 else if (TREE_CODE (type) == FUNCTION_TYPE
9471 || TREE_CODE (type) == METHOD_TYPE)
9476 if (!unqualified_id)
9477 return error_mark_node;
9479 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9480 original_name = dname;
9482 original_name = unqualified_id;
9484 if (storage_class == sc_auto)
9485 error ("storage class %<auto%> invalid for function %qs", name);
9486 else if (storage_class == sc_register)
9487 error ("storage class %<register%> invalid for function %qs", name);
9489 error ("storage class %<__thread%> invalid for function %qs", name);
9491 /* Function declaration not at top level.
9492 Storage classes other than `extern' are not allowed
9493 and `extern' makes no difference. */
9494 if (! toplevel_bindings_p ()
9495 && (storage_class == sc_static
9496 || declspecs->specs[(int)ds_inline])
9499 if (storage_class == sc_static)
9500 pedwarn (input_location, OPT_pedantic,
9501 "%<static%> specified invalid for function %qs "
9502 "declared out of global scope", name);
9504 pedwarn (input_location, OPT_pedantic,
9505 "%<inline%> specifier invalid for function %qs "
9506 "declared out of global scope", name);
9509 if (ctype != NULL_TREE
9510 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9512 error ("%q#T is not a class or a namespace", ctype);
9516 if (ctype == NULL_TREE)
9520 error ("virtual non-class function %qs", name);
9523 else if (sfk == sfk_constructor
9524 || sfk == sfk_destructor)
9527 ? "%qs defined in a non-class scope"
9528 : "%qs declared in a non-class scope", name);
9532 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9533 && !NEW_DELETE_OPNAME_P (original_name))
9534 type = build_method_type_directly (ctype,
9536 TYPE_ARG_TYPES (type));
9538 /* Record presence of `static'. */
9539 publicp = (ctype != NULL_TREE
9540 || storage_class == sc_extern
9541 || storage_class != sc_static);
9543 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9544 virtualp, flags, memfn_quals, raises,
9546 publicp, inlinep || constexpr_p, sfk, funcdef_flag,
9547 template_count, in_namespace, attrlist,
9548 declarator->id_loc);
9549 if (decl == NULL_TREE)
9550 return error_mark_node;
9554 int invalid_static = 0;
9556 /* Don't allow a static member function in a class, and forbid
9557 declaring main to be static. */
9558 if (TREE_CODE (type) == METHOD_TYPE)
9560 permerror (input_location, "cannot declare member function %qD to have "
9561 "static linkage", decl);
9564 else if (current_function_decl)
9566 /* FIXME need arm citation */
9567 error ("cannot declare static function inside another function");
9574 storage_class = sc_none;
9580 /* It's a variable. */
9582 /* An uninitialized decl with `extern' is a reference. */
9583 decl = grokvardecl (type, unqualified_id,
9586 (type_quals & TYPE_QUAL_CONST) != 0,
9587 ctype ? ctype : in_namespace);
9588 bad_specifiers (decl, "variable", virtualp,
9589 memfn_quals != TYPE_UNQUALIFIED,
9590 inlinep, friendp, raises != NULL_TREE);
9594 DECL_CONTEXT (decl) = ctype;
9597 permerror (input_location, "%<static%> may not be used when defining "
9598 "(as opposed to declaring) a static data member");
9600 storage_class = sc_none;
9602 if (storage_class == sc_register && TREE_STATIC (decl))
9604 error ("static member %qD declared %<register%>", decl);
9605 storage_class = sc_none;
9607 if (storage_class == sc_extern && pedantic)
9609 pedwarn (input_location, OPT_pedantic,
9610 "cannot explicitly declare member %q#D to have "
9611 "extern linkage", decl);
9612 storage_class = sc_none;
9617 if (storage_class == sc_extern && initialized && !funcdef_flag)
9619 if (toplevel_bindings_p ())
9621 /* It's common practice (and completely valid) to have a const
9622 be initialized and declared extern. */
9623 if (!(type_quals & TYPE_QUAL_CONST))
9624 warning (0, "%qs initialized and declared %<extern%>", name);
9628 error ("%qs has both %<extern%> and initializer", name);
9629 return error_mark_node;
9633 /* Record `register' declaration for warnings on &
9634 and in case doing stupid register allocation. */
9636 if (storage_class == sc_register)
9637 DECL_REGISTER (decl) = 1;
9638 else if (storage_class == sc_extern)
9639 DECL_THIS_EXTERN (decl) = 1;
9640 else if (storage_class == sc_static)
9641 DECL_THIS_STATIC (decl) = 1;
9643 /* Don't forget constexprness. */
9644 if (VAR_OR_FUNCTION_DECL_P (decl))
9645 DECL_DECLARED_CONSTEXPR_P (decl) = constexpr_p;
9647 /* Record constancy and volatility on the DECL itself . There's
9648 no need to do this when processing a template; we'll do this
9649 for the instantiated declaration based on the type of DECL. */
9650 if (!processing_template_decl)
9651 cp_apply_type_quals_to_decl (type_quals, decl);
9657 /* Subroutine of start_function. Ensure that each of the parameter
9658 types (as listed in PARMS) is complete, as is required for a
9659 function definition. */
9662 require_complete_types_for_parms (tree parms)
9664 for (; parms; parms = TREE_CHAIN (parms))
9666 if (dependent_type_p (TREE_TYPE (parms)))
9668 if (!VOID_TYPE_P (TREE_TYPE (parms))
9669 && complete_type_or_else (TREE_TYPE (parms), parms))
9671 relayout_decl (parms);
9672 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9675 /* grokparms or complete_type_or_else will have already issued
9677 TREE_TYPE (parms) = error_mark_node;
9681 /* Returns nonzero if T is a local variable. */
9684 local_variable_p (const_tree t)
9686 if ((TREE_CODE (t) == VAR_DECL
9687 /* A VAR_DECL with a context that is a _TYPE is a static data
9689 && !TYPE_P (CP_DECL_CONTEXT (t))
9690 /* Any other non-local variable must be at namespace scope. */
9691 && !DECL_NAMESPACE_SCOPE_P (t))
9692 || (TREE_CODE (t) == PARM_DECL))
9698 /* Like local_variable_p, but suitable for use as a tree-walking
9702 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9703 void *data ATTRIBUTE_UNUSED)
9705 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9707 else if (TYPE_P (*tp))
9714 /* Check that ARG, which is a default-argument expression for a
9715 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9716 something goes wrong. DECL may also be a _TYPE node, rather than a
9717 DECL, if there is no DECL available. */
9720 check_default_argument (tree decl, tree arg)
9725 if (TREE_CODE (arg) == DEFAULT_ARG)
9726 /* We get a DEFAULT_ARG when looking at an in-class declaration
9727 with a default argument. Ignore the argument for now; we'll
9728 deal with it after the class is complete. */
9737 decl_type = TREE_TYPE (decl);
9739 if (arg == error_mark_node
9740 || decl == error_mark_node
9741 || TREE_TYPE (arg) == error_mark_node
9742 || decl_type == error_mark_node)
9743 /* Something already went wrong. There's no need to check
9745 return error_mark_node;
9747 /* [dcl.fct.default]
9749 A default argument expression is implicitly converted to the
9751 if (!TREE_TYPE (arg)
9752 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9755 error ("default argument for %q#D has type %qT",
9756 decl, TREE_TYPE (arg));
9758 error ("default argument for parameter of type %qT has type %qT",
9759 decl_type, TREE_TYPE (arg));
9761 return error_mark_node;
9764 /* [dcl.fct.default]
9766 Local variables shall not be used in default argument
9769 The keyword `this' shall not be used in a default argument of a
9771 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9774 error ("default argument %qE uses local variable %qD", arg, var);
9775 return error_mark_node;
9782 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9785 type_is_deprecated (tree type)
9787 enum tree_code code;
9788 if (TREE_DEPRECATED (type))
9790 if (TYPE_NAME (type)
9791 && TREE_DEPRECATED (TYPE_NAME (type)))
9794 /* Do warn about using typedefs to a deprecated class. */
9795 if (TAGGED_TYPE_P (type) && type != TYPE_MAIN_VARIANT (type))
9796 return type_is_deprecated (TYPE_MAIN_VARIANT (type));
9798 code = TREE_CODE (type);
9800 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9801 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9802 || code == METHOD_TYPE || code == ARRAY_TYPE)
9803 return type_is_deprecated (TREE_TYPE (type));
9805 if (TYPE_PTRMEMFUNC_P (type))
9806 return type_is_deprecated
9807 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9812 /* Decode the list of parameter types for a function type.
9813 Given the list of things declared inside the parens,
9814 return a list of types.
9816 If this parameter does not end with an ellipsis, we append
9819 *PARMS is set to the chain of PARM_DECLs created. */
9822 grokparms (tree parmlist, tree *parms)
9824 tree result = NULL_TREE;
9825 tree decls = NULL_TREE;
9829 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9831 tree type = NULL_TREE;
9832 tree init = TREE_PURPOSE (parm);
9833 tree decl = TREE_VALUE (parm);
9836 if (parm == void_list_node)
9839 if (! decl || TREE_TYPE (decl) == error_mark_node)
9842 type = TREE_TYPE (decl);
9843 if (VOID_TYPE_P (type))
9845 if (same_type_p (type, void_type_node)
9846 && DECL_SELF_REFERENCE_P (type)
9847 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9848 /* this is a parmlist of `(void)', which is ok. */
9850 cxx_incomplete_type_error (decl, type);
9851 /* It's not a good idea to actually create parameters of
9852 type `void'; other parts of the compiler assume that a
9853 void type terminates the parameter list. */
9854 type = error_mark_node;
9855 TREE_TYPE (decl) = error_mark_node;
9858 if (type != error_mark_node
9859 && TYPE_FOR_JAVA (type)
9860 && MAYBE_CLASS_TYPE_P (type))
9862 error ("parameter %qD has Java class type", decl);
9863 type = error_mark_node;
9864 TREE_TYPE (decl) = error_mark_node;
9868 if (type != error_mark_node
9869 && (errmsg = targetm.invalid_parameter_type (type)))
9872 type = error_mark_node;
9873 TREE_TYPE (decl) = error_mark_node;
9876 if (type != error_mark_node)
9878 if (deprecated_state != DEPRECATED_SUPPRESS)
9880 tree deptype = type_is_deprecated (type);
9882 warn_deprecated_use (deptype, NULL_TREE);
9885 /* Top-level qualifiers on the parameters are
9886 ignored for function types. */
9887 type = cp_build_qualified_type (type, 0);
9888 if (TREE_CODE (type) == METHOD_TYPE)
9890 error ("parameter %qD invalidly declared method type", decl);
9891 type = build_pointer_type (type);
9892 TREE_TYPE (decl) = type;
9894 else if (abstract_virtuals_error (decl, type))
9895 any_error = 1; /* Seems like a good idea. */
9896 else if (POINTER_TYPE_P (type))
9898 /* [dcl.fct]/6, parameter types cannot contain pointers
9899 (references) to arrays of unknown bound. */
9900 tree t = TREE_TYPE (type);
9901 int ptr = TYPE_PTR_P (type);
9907 else if (TREE_CODE (t) != ARRAY_TYPE)
9909 else if (!TYPE_DOMAIN (t))
9913 if (TREE_CODE (t) == ARRAY_TYPE)
9915 ? G_("parameter %qD includes pointer to array of "
9916 "unknown bound %qT")
9917 : G_("parameter %qD includes reference to array of "
9918 "unknown bound %qT"),
9924 else if (init && !processing_template_decl)
9925 init = check_default_argument (decl, init);
9928 if (TREE_CODE (decl) == PARM_DECL
9929 && FUNCTION_PARAMETER_PACK_P (decl)
9930 && TREE_CHAIN (parm)
9931 && TREE_CHAIN (parm) != void_list_node)
9932 error ("parameter packs must be at the end of the parameter list");
9934 TREE_CHAIN (decl) = decls;
9936 result = tree_cons (init, type, result);
9938 decls = nreverse (decls);
9939 result = nreverse (result);
9941 result = chainon (result, void_list_node);
9948 /* D is a constructor or overloaded `operator='.
9950 Let T be the class in which D is declared. Then, this function
9953 -1 if D's is an ill-formed constructor or copy assignment operator
9954 whose first parameter is of type `T'.
9955 0 if D is not a copy constructor or copy assignment
9957 1 if D is a copy constructor or copy assignment operator whose
9958 first parameter is a reference to non-const qualified T.
9959 2 if D is a copy constructor or copy assignment operator whose
9960 first parameter is a reference to const qualified T.
9962 This function can be used as a predicate. Positive values indicate
9963 a copy constructor and nonzero values indicate a copy assignment
9967 copy_fn_p (const_tree d)
9973 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9975 if (TREE_CODE (d) == TEMPLATE_DECL
9976 || (DECL_TEMPLATE_INFO (d)
9977 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9978 /* Instantiations of template member functions are never copy
9979 functions. Note that member functions of templated classes are
9980 represented as template functions internally, and we must
9981 accept those as copy functions. */
9984 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9988 arg_type = TREE_VALUE (args);
9989 if (arg_type == error_mark_node)
9992 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9994 /* Pass by value copy assignment operator. */
9997 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9998 && !TYPE_REF_IS_RVALUE (arg_type)
9999 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
10001 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
10007 args = TREE_CHAIN (args);
10009 if (args && args != void_list_node && !TREE_PURPOSE (args))
10010 /* There are more non-optional args. */
10016 /* D is a constructor or overloaded `operator='.
10018 Let T be the class in which D is declared. Then, this function
10019 returns true when D is a move constructor or move assignment
10020 operator, false otherwise. */
10023 move_fn_p (const_tree d)
10027 bool result = false;
10029 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
10031 if (cxx_dialect == cxx98)
10032 /* There are no move constructors if we are in C++98 mode. */
10035 if (TREE_CODE (d) == TEMPLATE_DECL
10036 || (DECL_TEMPLATE_INFO (d)
10037 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
10038 /* Instantiations of template member functions are never copy
10039 functions. Note that member functions of templated classes are
10040 represented as template functions internally, and we must
10041 accept those as copy functions. */
10044 args = FUNCTION_FIRST_USER_PARMTYPE (d);
10048 arg_type = TREE_VALUE (args);
10049 if (arg_type == error_mark_node)
10052 if (TREE_CODE (arg_type) == REFERENCE_TYPE
10053 && TYPE_REF_IS_RVALUE (arg_type)
10054 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
10058 args = TREE_CHAIN (args);
10060 if (args && args != void_list_node && !TREE_PURPOSE (args))
10061 /* There are more non-optional args. */
10067 /* Remember any special properties of member function DECL. */
10070 grok_special_member_properties (tree decl)
10074 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
10077 class_type = DECL_CONTEXT (decl);
10078 if (DECL_CONSTRUCTOR_P (decl))
10080 int ctor = copy_fn_p (decl);
10082 if (!DECL_ARTIFICIAL (decl))
10083 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
10089 A non-template constructor for class X is a copy
10090 constructor if its first parameter is of type X&, const
10091 X&, volatile X& or const volatile X&, and either there
10092 are no other parameters or else all other parameters have
10093 default arguments. */
10094 TYPE_HAS_INIT_REF (class_type) = 1;
10095 if (user_provided_p (decl))
10096 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
10098 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
10100 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
10102 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
10103 if (user_provided_p (decl))
10104 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
10106 else if (is_list_ctor (decl))
10107 TYPE_HAS_LIST_CTOR (class_type) = 1;
10109 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
10113 A non-template assignment operator for class X is a copy
10114 assignment operator if its parameter is of type X, X&, const
10115 X&, volatile X& or const volatile X&. */
10117 int assop = copy_fn_p (decl);
10121 TYPE_HAS_ASSIGN_REF (class_type) = 1;
10122 if (user_provided_p (decl))
10123 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
10125 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
10130 /* Check a constructor DECL has the correct form. Complains
10131 if the class has a constructor of the form X(X). */
10134 grok_ctor_properties (const_tree ctype, const_tree decl)
10136 int ctor_parm = copy_fn_p (decl);
10142 A declaration of a constructor for a class X is ill-formed if
10143 its first parameter is of type (optionally cv-qualified) X
10144 and either there are no other parameters or else all other
10145 parameters have default arguments.
10147 We *don't* complain about member template instantiations that
10148 have this form, though; they can occur as we try to decide
10149 what constructor to use during overload resolution. Since
10150 overload resolution will never prefer such a constructor to
10151 the non-template copy constructor (which is either explicitly
10152 or implicitly defined), there's no need to worry about their
10153 existence. Theoretically, they should never even be
10154 instantiated, but that's hard to forestall. */
10155 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
10163 /* An operator with this code is unary, but can also be binary. */
10166 ambi_op_p (enum tree_code code)
10168 return (code == INDIRECT_REF
10169 || code == ADDR_EXPR
10170 || code == UNARY_PLUS_EXPR
10171 || code == NEGATE_EXPR
10172 || code == PREINCREMENT_EXPR
10173 || code == PREDECREMENT_EXPR);
10176 /* An operator with this name can only be unary. */
10179 unary_op_p (enum tree_code code)
10181 return (code == TRUTH_NOT_EXPR
10182 || code == BIT_NOT_EXPR
10183 || code == COMPONENT_REF
10184 || code == TYPE_EXPR);
10187 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
10188 errors are issued for invalid declarations. */
10191 grok_op_properties (tree decl, bool complain)
10193 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
10195 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
10196 tree name = DECL_NAME (decl);
10197 enum tree_code operator_code;
10202 /* Count the number of arguments and check for ellipsis. */
10203 for (argtype = argtypes, arity = 0;
10204 argtype && argtype != void_list_node;
10205 argtype = TREE_CHAIN (argtype))
10207 ellipsis_p = !argtype;
10209 class_type = DECL_CONTEXT (decl);
10210 if (class_type && !CLASS_TYPE_P (class_type))
10211 class_type = NULL_TREE;
10213 if (DECL_CONV_FN_P (decl))
10214 operator_code = TYPE_EXPR;
10218 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
10219 if (ansi_opname (CODE) == name) \
10221 operator_code = (CODE); \
10224 else if (ansi_assopname (CODE) == name) \
10226 operator_code = (CODE); \
10227 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
10231 #include "operators.def"
10232 #undef DEF_OPERATOR
10234 gcc_unreachable ();
10237 gcc_assert (operator_code != MAX_TREE_CODES);
10238 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10241 switch (operator_code)
10244 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10248 TYPE_GETS_DELETE (class_type) |= 1;
10252 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10255 case VEC_DELETE_EXPR:
10256 TYPE_GETS_DELETE (class_type) |= 2;
10263 /* [basic.std.dynamic.allocation]/1:
10265 A program is ill-formed if an allocation function is declared
10266 in a namespace scope other than global scope or declared static
10269 The same also holds true for deallocation functions. */
10270 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10271 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10273 if (DECL_NAMESPACE_SCOPE_P (decl))
10275 if (CP_DECL_CONTEXT (decl) != global_namespace)
10277 error ("%qD may not be declared within a namespace", decl);
10280 else if (!TREE_PUBLIC (decl))
10282 error ("%qD may not be declared as static", decl);
10288 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10290 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10291 DECL_IS_OPERATOR_NEW (decl) = 1;
10293 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10294 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10297 /* An operator function must either be a non-static member function
10298 or have at least one parameter of a class, a reference to a class,
10299 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10300 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10302 if (operator_code == TYPE_EXPR
10303 || operator_code == CALL_EXPR
10304 || operator_code == COMPONENT_REF
10305 || operator_code == ARRAY_REF
10306 || operator_code == NOP_EXPR)
10308 if (class_type && LAMBDA_TYPE_P (class_type))
10309 /* Lambdas can have static op() and conv ops. */;
10312 error ("%qD must be a nonstatic member function", decl);
10320 if (DECL_STATIC_FUNCTION_P (decl))
10322 error ("%qD must be either a non-static member "
10323 "function or a non-member function", decl);
10327 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10329 tree arg = non_reference (TREE_VALUE (p));
10330 if (arg == error_mark_node)
10333 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10334 because these checks are performed even on
10335 template functions. */
10336 if (MAYBE_CLASS_TYPE_P (arg)
10337 || TREE_CODE (arg) == ENUMERAL_TYPE)
10341 if (!p || p == void_list_node)
10344 error ("%qD must have an argument of class or "
10345 "enumerated type", decl);
10351 /* There are no restrictions on the arguments to an overloaded
10353 if (operator_code == CALL_EXPR)
10356 /* Warn about conversion operators that will never be used. */
10357 if (IDENTIFIER_TYPENAME_P (name)
10358 && ! DECL_TEMPLATE_INFO (decl)
10360 /* Warn only declaring the function; there is no need to
10361 warn again about out-of-class definitions. */
10362 && class_type == current_class_type)
10364 tree t = TREE_TYPE (name);
10365 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10368 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10370 if (TREE_CODE (t) == VOID_TYPE)
10371 warning (OPT_Wconversion,
10373 ? G_("conversion to a reference to void "
10374 "will never use a type conversion operator")
10375 : G_("conversion to void "
10376 "will never use a type conversion operator"));
10377 else if (class_type)
10379 if (t == class_type)
10380 warning (OPT_Wconversion,
10382 ? G_("conversion to a reference to the same type "
10383 "will never use a type conversion operator")
10384 : G_("conversion to the same type "
10385 "will never use a type conversion operator"));
10386 /* Don't force t to be complete here. */
10387 else if (MAYBE_CLASS_TYPE_P (t)
10388 && COMPLETE_TYPE_P (t)
10389 && DERIVED_FROM_P (t, class_type))
10390 warning (OPT_Wconversion,
10392 ? G_("conversion to a reference to a base class "
10393 "will never use a type conversion operator")
10394 : G_("conversion to a base class "
10395 "will never use a type conversion operator"));
10400 if (operator_code == COND_EXPR)
10403 error ("ISO C++ prohibits overloading operator ?:");
10406 else if (ellipsis_p)
10408 error ("%qD must not have variable number of arguments", decl);
10411 else if (ambi_op_p (operator_code))
10414 /* We pick the one-argument operator codes by default, so
10415 we don't have to change anything. */
10417 else if (arity == 2)
10419 /* If we thought this was a unary operator, we now know
10420 it to be a binary operator. */
10421 switch (operator_code)
10424 operator_code = MULT_EXPR;
10428 operator_code = BIT_AND_EXPR;
10431 case UNARY_PLUS_EXPR:
10432 operator_code = PLUS_EXPR;
10436 operator_code = MINUS_EXPR;
10439 case PREINCREMENT_EXPR:
10440 operator_code = POSTINCREMENT_EXPR;
10443 case PREDECREMENT_EXPR:
10444 operator_code = POSTDECREMENT_EXPR;
10448 gcc_unreachable ();
10451 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10453 if ((operator_code == POSTINCREMENT_EXPR
10454 || operator_code == POSTDECREMENT_EXPR)
10455 && ! processing_template_decl
10456 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10459 error ("postfix %qD must take %<int%> as its argument",
10462 error ("postfix %qD must take %<int%> as its second "
10470 error ("%qD must take either zero or one argument", decl);
10472 error ("%qD must take either one or two arguments", decl);
10476 /* More Effective C++ rule 6. */
10478 && (operator_code == POSTINCREMENT_EXPR
10479 || operator_code == POSTDECREMENT_EXPR
10480 || operator_code == PREINCREMENT_EXPR
10481 || operator_code == PREDECREMENT_EXPR))
10483 tree arg = TREE_VALUE (argtypes);
10484 tree ret = TREE_TYPE (TREE_TYPE (decl));
10485 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10486 arg = TREE_TYPE (arg);
10487 arg = TYPE_MAIN_VARIANT (arg);
10488 if (operator_code == PREINCREMENT_EXPR
10489 || operator_code == PREDECREMENT_EXPR)
10491 if (TREE_CODE (ret) != REFERENCE_TYPE
10492 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10494 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10495 build_reference_type (arg));
10499 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10500 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10504 else if (unary_op_p (operator_code))
10509 error ("%qD must take %<void%>", decl);
10511 error ("%qD must take exactly one argument", decl);
10515 else /* if (binary_op_p (operator_code)) */
10520 error ("%qD must take exactly one argument", decl);
10522 error ("%qD must take exactly two arguments", decl);
10526 /* More Effective C++ rule 7. */
10528 && (operator_code == TRUTH_ANDIF_EXPR
10529 || operator_code == TRUTH_ORIF_EXPR
10530 || operator_code == COMPOUND_EXPR))
10531 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10535 /* Effective C++ rule 23. */
10538 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10539 && (operator_code == PLUS_EXPR
10540 || operator_code == MINUS_EXPR
10541 || operator_code == TRUNC_DIV_EXPR
10542 || operator_code == MULT_EXPR
10543 || operator_code == TRUNC_MOD_EXPR)
10544 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10545 warning (OPT_Weffc__, "%qD should return by value", decl);
10547 /* [over.oper]/8 */
10548 for (; argtypes && argtypes != void_list_node;
10549 argtypes = TREE_CHAIN (argtypes))
10550 if (TREE_PURPOSE (argtypes))
10552 TREE_PURPOSE (argtypes) = NULL_TREE;
10553 if (operator_code == POSTINCREMENT_EXPR
10554 || operator_code == POSTDECREMENT_EXPR)
10556 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10561 error ("%qD cannot have default arguments", decl);
10569 /* Return a string giving the keyword associate with CODE. */
10571 static const char *
10572 tag_name (enum tag_types code)
10584 case typename_type:
10587 gcc_unreachable ();
10591 /* Name lookup in an elaborated-type-specifier (after the keyword
10592 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10593 elaborated-type-specifier is invalid, issue a diagnostic and return
10594 error_mark_node; otherwise, return the *_TYPE to which it referred.
10595 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10598 check_elaborated_type_specifier (enum tag_types tag_code,
10600 bool allow_template_p)
10606 struct S { struct S *p; };
10608 name lookup will find the TYPE_DECL for the implicit "S::S"
10609 typedef. Adjust for that here. */
10610 if (DECL_SELF_REFERENCE_P (decl))
10611 decl = TYPE_NAME (TREE_TYPE (decl));
10613 type = TREE_TYPE (decl);
10615 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10616 is false for this case as well. */
10617 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10619 error ("using template type parameter %qT after %qs",
10620 type, tag_name (tag_code));
10621 return error_mark_node;
10625 If the identifier resolves to a typedef-name or a template
10626 type-parameter, the elaborated-type-specifier is ill-formed.
10628 In other words, the only legitimate declaration to use in the
10629 elaborated type specifier is the implicit typedef created when
10630 the type is declared. */
10631 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10632 && !DECL_SELF_REFERENCE_P (decl)
10633 && tag_code != typename_type)
10635 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10636 error ("%q+D has a previous declaration here", decl);
10637 return error_mark_node;
10639 else if (TREE_CODE (type) != RECORD_TYPE
10640 && TREE_CODE (type) != UNION_TYPE
10641 && tag_code != enum_type
10642 && tag_code != typename_type)
10644 error ("%qT referred to as %qs", type, tag_name (tag_code));
10645 error ("%q+T has a previous declaration here", type);
10646 return error_mark_node;
10648 else if (TREE_CODE (type) != ENUMERAL_TYPE
10649 && tag_code == enum_type)
10651 error ("%qT referred to as enum", type);
10652 error ("%q+T has a previous declaration here", type);
10653 return error_mark_node;
10655 else if (!allow_template_p
10656 && TREE_CODE (type) == RECORD_TYPE
10657 && CLASSTYPE_IS_TEMPLATE (type))
10659 /* If a class template appears as elaborated type specifier
10660 without a template header such as:
10662 template <class T> class C {};
10663 void f(class C); // No template header here
10665 then the required template argument is missing. */
10666 error ("template argument required for %<%s %T%>",
10667 tag_name (tag_code),
10668 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10669 return error_mark_node;
10675 /* Lookup NAME in elaborate type specifier in scope according to
10676 SCOPE and issue diagnostics if necessary.
10677 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10678 found, and ERROR_MARK_NODE for type error. */
10681 lookup_and_check_tag (enum tag_types tag_code, tree name,
10682 tag_scope scope, bool template_header_p)
10686 if (scope == ts_global)
10688 /* First try ordinary name lookup, ignoring hidden class name
10689 injected via friend declaration. */
10690 decl = lookup_name_prefer_type (name, 2);
10691 /* If that fails, the name will be placed in the smallest
10692 non-class, non-function-prototype scope according to 3.3.1/5.
10693 We may already have a hidden name declared as friend in this
10694 scope. So lookup again but not ignoring hidden names.
10695 If we find one, that name will be made visible rather than
10696 creating a new tag. */
10698 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10701 decl = lookup_type_scope (name, scope);
10703 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10704 decl = DECL_TEMPLATE_RESULT (decl);
10706 if (decl && TREE_CODE (decl) == TYPE_DECL)
10708 /* Look for invalid nested type:
10712 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10714 error ("%qD has the same name as the class in which it is "
10717 return error_mark_node;
10720 /* Two cases we need to consider when deciding if a class
10721 template is allowed as an elaborated type specifier:
10722 1. It is a self reference to its own class.
10723 2. It comes with a template header.
10727 template <class T> class C {
10728 class C *c1; // DECL_SELF_REFERENCE_P is true
10731 template <class U> class C; // template_header_p is true
10732 template <class T> class C<T>::D {
10733 class C *c2; // DECL_SELF_REFERENCE_P is true
10736 t = check_elaborated_type_specifier (tag_code,
10739 | DECL_SELF_REFERENCE_P (decl));
10742 else if (decl && TREE_CODE (decl) == TREE_LIST)
10744 error ("reference to %qD is ambiguous", name);
10745 print_candidates (decl);
10746 return error_mark_node;
10752 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10753 Define the tag as a forward-reference if it is not defined.
10755 If a declaration is given, process it here, and report an error if
10756 multiple declarations are not identical.
10758 SCOPE is TS_CURRENT when this is also a definition. Only look in
10759 the current frame for the name (since C++ allows new names in any
10760 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10761 declaration. Only look beginning from the current scope outward up
10762 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10764 TEMPLATE_HEADER_P is true when this declaration is preceded by
10765 a set of template parameters. */
10768 xref_tag (enum tag_types tag_code, tree name,
10769 tag_scope scope, bool template_header_p)
10771 enum tree_code code;
10773 tree context = NULL_TREE;
10775 timevar_push (TV_NAME_LOOKUP);
10777 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10783 code = RECORD_TYPE;
10789 code = ENUMERAL_TYPE;
10792 gcc_unreachable ();
10795 /* In case of anonymous name, xref_tag is only called to
10796 make type node and push name. Name lookup is not required. */
10797 if (ANON_AGGRNAME_P (name))
10800 t = lookup_and_check_tag (tag_code, name,
10801 scope, template_header_p);
10803 if (t == error_mark_node)
10804 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10806 if (scope != ts_current && t && current_class_type
10807 && template_class_depth (current_class_type)
10808 && template_header_p)
10810 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10811 definition of this tag. Since, in addition, we are currently
10812 processing a (member) template declaration of a template
10813 class, we must be very careful; consider:
10820 { template <class V>
10821 friend struct S1; };
10823 Here, the S2::S1 declaration should not be confused with the
10824 outer declaration. In particular, the inner version should
10825 have a template parameter of level 2, not level 1. This
10826 would be particularly important if the member declaration
10829 template <class V = U> friend struct S1;
10831 say, when we should tsubst into `U' when instantiating
10832 S2. On the other hand, when presented with:
10842 we must find the inner binding eventually. We
10843 accomplish this by making sure that the new type we
10844 create to represent this declaration has the right
10846 context = TYPE_CONTEXT (t);
10852 /* If no such tag is yet defined, create a forward-reference node
10853 and record it as the "definition".
10854 When a real declaration of this type is found,
10855 the forward-reference will be altered into a real type. */
10856 if (code == ENUMERAL_TYPE)
10858 error ("use of enum %q#D without previous declaration", name);
10859 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10863 t = make_class_type (code);
10864 TYPE_CONTEXT (t) = context;
10865 t = pushtag (name, t, scope);
10870 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10872 if (!redeclare_class_template (t, current_template_parms))
10873 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10875 else if (!processing_template_decl
10876 && CLASS_TYPE_P (t)
10877 && CLASSTYPE_IS_TEMPLATE (t))
10879 error ("redeclaration of %qT as a non-template", t);
10880 error ("previous declaration %q+D", t);
10881 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10884 /* Make injected friend class visible. */
10885 if (scope != ts_within_enclosing_non_class
10886 && hidden_name_p (TYPE_NAME (t)))
10888 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10889 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10891 if (TYPE_TEMPLATE_INFO (t))
10893 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10894 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10899 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10903 xref_tag_from_type (tree old, tree id, tag_scope scope)
10905 enum tag_types tag_kind;
10907 if (TREE_CODE (old) == RECORD_TYPE)
10908 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10910 tag_kind = union_type;
10912 if (id == NULL_TREE)
10913 id = TYPE_IDENTIFIER (old);
10915 return xref_tag (tag_kind, id, scope, false);
10918 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10919 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10920 access_* node, and the TREE_VALUE is the type of the base-class.
10921 Non-NULL TREE_TYPE indicates virtual inheritance.
10923 Returns true if the binfo hierarchy was successfully created,
10924 false if an error was detected. */
10927 xref_basetypes (tree ref, tree base_list)
10930 tree binfo, base_binfo;
10931 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10932 unsigned max_bases = 0; /* Maximum direct bases. */
10934 tree default_access;
10935 tree igo_prev; /* Track Inheritance Graph Order. */
10937 if (ref == error_mark_node)
10940 /* The base of a derived class is private by default, all others are
10942 default_access = (TREE_CODE (ref) == RECORD_TYPE
10943 && CLASSTYPE_DECLARED_CLASS (ref)
10944 ? access_private_node : access_public_node);
10946 /* First, make sure that any templates in base-classes are
10947 instantiated. This ensures that if we call ourselves recursively
10948 we do not get confused about which classes are marked and which
10950 basep = &base_list;
10953 tree basetype = TREE_VALUE (*basep);
10955 if (!(processing_template_decl && uses_template_parms (basetype))
10956 && !complete_type_or_else (basetype, NULL))
10957 /* An incomplete type. Remove it from the list. */
10958 *basep = TREE_CHAIN (*basep);
10962 if (TREE_TYPE (*basep))
10964 if (CLASS_TYPE_P (basetype))
10965 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10966 basep = &TREE_CHAIN (*basep);
10970 TYPE_MARKED_P (ref) = 1;
10972 /* The binfo slot should be empty, unless this is an (ill-formed)
10974 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10975 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10977 binfo = make_tree_binfo (max_bases);
10979 TYPE_BINFO (ref) = binfo;
10980 BINFO_OFFSET (binfo) = size_zero_node;
10981 BINFO_TYPE (binfo) = ref;
10983 /* Apply base-class info set up to the variants of this type. */
10984 fixup_type_variants (ref);
10988 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10989 /* An aggregate cannot have baseclasses. */
10990 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10992 if (TREE_CODE (ref) == UNION_TYPE)
10994 error ("derived union %qT invalid", ref);
11001 if (TYPE_FOR_JAVA (ref))
11003 error ("Java class %qT cannot have multiple bases", ref);
11010 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
11012 if (TYPE_FOR_JAVA (ref))
11014 error ("Java class %qT cannot have virtual bases", ref);
11019 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
11021 tree access = TREE_PURPOSE (base_list);
11022 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
11023 tree basetype = TREE_VALUE (base_list);
11025 if (access == access_default_node)
11026 access = default_access;
11028 if (PACK_EXPANSION_P (basetype))
11029 basetype = PACK_EXPANSION_PATTERN (basetype);
11030 if (TREE_CODE (basetype) == TYPE_DECL)
11031 basetype = TREE_TYPE (basetype);
11032 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
11034 error ("base type %qT fails to be a struct or class type",
11039 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
11040 TYPE_FOR_JAVA (ref) = 1;
11042 base_binfo = NULL_TREE;
11043 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
11045 base_binfo = TYPE_BINFO (basetype);
11046 /* The original basetype could have been a typedef'd type. */
11047 basetype = BINFO_TYPE (base_binfo);
11049 /* Inherit flags from the base. */
11050 TYPE_HAS_NEW_OPERATOR (ref)
11051 |= TYPE_HAS_NEW_OPERATOR (basetype);
11052 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
11053 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
11054 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
11055 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
11056 CLASSTYPE_DIAMOND_SHAPED_P (ref)
11057 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
11058 CLASSTYPE_REPEATED_BASE_P (ref)
11059 |= CLASSTYPE_REPEATED_BASE_P (basetype);
11062 /* We must do this test after we've seen through a typedef
11064 if (TYPE_MARKED_P (basetype))
11066 if (basetype == ref)
11067 error ("recursive type %qT undefined", basetype);
11069 error ("duplicate base type %qT invalid", basetype);
11073 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
11074 /* Regenerate the pack expansion for the bases. */
11075 basetype = make_pack_expansion (basetype);
11077 TYPE_MARKED_P (basetype) = 1;
11079 base_binfo = copy_binfo (base_binfo, basetype, ref,
11080 &igo_prev, via_virtual);
11081 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
11082 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
11084 BINFO_BASE_APPEND (binfo, base_binfo);
11085 BINFO_BASE_ACCESS_APPEND (binfo, access);
11088 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
11089 /* If we have space in the vbase vector, we must have shared at
11090 least one of them, and are therefore diamond shaped. */
11091 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
11093 /* Unmark all the types. */
11094 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11095 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11096 TYPE_MARKED_P (ref) = 0;
11098 /* Now see if we have a repeated base type. */
11099 if (!CLASSTYPE_REPEATED_BASE_P (ref))
11101 for (base_binfo = binfo; base_binfo;
11102 base_binfo = TREE_CHAIN (base_binfo))
11104 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11106 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
11109 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
11111 for (base_binfo = binfo; base_binfo;
11112 base_binfo = TREE_CHAIN (base_binfo))
11113 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
11114 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
11123 /* Begin compiling the definition of an enumeration type.
11126 UNDERLYING_TYPE is the type that will be used as the storage for
11127 the enumeration type. This should be NULL_TREE if no storage type
11130 SCOPED_ENUM_P is true if this is a scoped enumeration type.
11132 Returns the type object, as yet incomplete.
11133 Also records info about it so that build_enumerator
11134 may be used to declare the individual values as they are read. */
11137 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
11141 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
11143 /* If this is the real definition for a previous forward reference,
11144 fill in the contents in the same object that used to be the
11145 forward reference. */
11147 enumtype = lookup_and_check_tag (enum_type, name,
11148 /*tag_scope=*/ts_current,
11149 /*template_header_p=*/false);
11151 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
11153 error_at (input_location, "multiple definition of %q#T", enumtype);
11154 error_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (enumtype)),
11155 "previous definition here");
11156 /* Clear out TYPE_VALUES, and start again. */
11157 TYPE_VALUES (enumtype) = NULL_TREE;
11161 /* In case of error, make a dummy enum to allow parsing to
11163 if (enumtype == error_mark_node)
11164 name = make_anon_name ();
11166 enumtype = cxx_make_type (ENUMERAL_TYPE);
11167 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
11170 if (enumtype == error_mark_node)
11175 SET_SCOPED_ENUM_P (enumtype, 1);
11176 begin_scope (sk_scoped_enum, enumtype);
11178 /* [C++0x dcl.enum]p5:
11180 If not explicitly specified, the underlying type of a scoped
11181 enumeration type is int. */
11182 if (!underlying_type)
11183 underlying_type = integer_type_node;
11186 if (underlying_type)
11188 if (CP_INTEGRAL_TYPE_P (underlying_type))
11190 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
11191 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
11192 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11193 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11194 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11195 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11196 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11197 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11198 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11199 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
11201 else if (!dependent_type_p (underlying_type))
11202 error ("underlying type %<%T%> of %<%T%> must be an integral type",
11203 underlying_type, enumtype);
11209 /* After processing and defining all the values of an enumeration type,
11210 install their decls in the enumeration type and finish it off.
11211 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
11214 finish_enum (tree enumtype)
11223 bool use_short_enum;
11228 tree underlying_type = NULL_TREE;
11229 bool fixed_underlying_type_p
11230 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
11232 /* We built up the VALUES in reverse order. */
11233 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
11235 /* For an enum defined in a template, just set the type of the values;
11236 all further processing is postponed until the template is
11237 instantiated. We need to set the type so that tsubst of a CONST_DECL
11239 if (processing_template_decl)
11241 for (values = TYPE_VALUES (enumtype);
11243 values = TREE_CHAIN (values))
11244 TREE_TYPE (TREE_VALUE (values)) = enumtype;
11245 if (at_function_scope_p ())
11246 add_stmt (build_min (TAG_DEFN, enumtype));
11247 if (SCOPED_ENUM_P (enumtype))
11252 /* Determine the minimum and maximum values of the enumerators. */
11253 if (TYPE_VALUES (enumtype))
11255 minnode = maxnode = NULL_TREE;
11257 for (values = TYPE_VALUES (enumtype);
11259 values = TREE_CHAIN (values))
11261 decl = TREE_VALUE (values);
11263 /* [dcl.enum]: Following the closing brace of an enum-specifier,
11264 each enumerator has the type of its enumeration. Prior to the
11265 closing brace, the type of each enumerator is the type of its
11266 initializing value. */
11267 TREE_TYPE (decl) = enumtype;
11269 /* Update the minimum and maximum values, if appropriate. */
11270 value = DECL_INITIAL (decl);
11271 if (value == error_mark_node)
11272 value = integer_zero_node;
11273 /* Figure out what the minimum and maximum values of the
11274 enumerators are. */
11276 minnode = maxnode = value;
11277 else if (tree_int_cst_lt (maxnode, value))
11279 else if (tree_int_cst_lt (value, minnode))
11286 If the enumerator-list is empty, the underlying type is as if
11287 the enumeration had a single enumerator with value 0. */
11288 minnode = maxnode = integer_zero_node;
11290 /* Compute the number of bits require to represent all values of the
11291 enumeration. We must do this before the type of MINNODE and
11292 MAXNODE are transformed, since tree_int_cst_min_precision relies
11293 on the TREE_TYPE of the value it is passed. */
11294 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11295 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11296 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11297 precision = MAX (lowprec, highprec);
11299 if (!fixed_underlying_type_p)
11301 /* Determine the underlying type of the enumeration.
11305 The underlying type of an enumeration is an integral type that
11306 can represent all the enumerator values defined in the
11307 enumeration. It is implementation-defined which integral type is
11308 used as the underlying type for an enumeration except that the
11309 underlying type shall not be larger than int unless the value of
11310 an enumerator cannot fit in an int or unsigned int.
11312 We use "int" or an "unsigned int" as the underlying type, even if
11313 a smaller integral type would work, unless the user has
11314 explicitly requested that we use the smallest possible type. The
11315 user can request that for all enumerations with a command line
11316 flag, or for just one enumeration with an attribute. */
11318 use_short_enum = flag_short_enums
11319 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11321 for (itk = (use_short_enum ? itk_char : itk_int);
11325 underlying_type = integer_types[itk];
11326 if (TYPE_PRECISION (underlying_type) >= precision
11327 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11330 if (itk == itk_none)
11334 IF no integral type can represent all the enumerator values, the
11335 enumeration is ill-formed. */
11336 error ("no integral type can represent all of the enumerator values "
11337 "for %qT", enumtype);
11338 precision = TYPE_PRECISION (long_long_integer_type_node);
11339 underlying_type = integer_types[itk_unsigned_long_long];
11344 The value of sizeof() applied to an enumeration type, an object
11345 of an enumeration type, or an enumerator, is the value of sizeof()
11346 applied to the underlying type. */
11347 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11348 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11349 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11350 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11351 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11352 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11354 /* Set the underlying type of the enumeration type to the
11355 computed enumeration type, restricted to the enumerator
11357 ENUM_UNDERLYING_TYPE (enumtype)
11358 = build_distinct_type_copy (underlying_type);
11359 set_min_and_max_values_for_integral_type
11360 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11363 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11365 /* Compute the minimum and maximum values for the type.
11369 For an enumeration where emin is the smallest enumerator and emax
11370 is the largest, the values of the enumeration are the values of the
11371 underlying type in the range bmin to bmax, where bmin and bmax are,
11372 respectively, the smallest and largest values of the smallest bit-
11373 field that can store emin and emax. */
11375 /* The middle-end currently assumes that types with TYPE_PRECISION
11376 narrower than their underlying type are suitably zero or sign
11377 extended to fill their mode. g++ doesn't make these guarantees.
11378 Until the middle-end can represent such paradoxical types, we
11379 set the TYPE_PRECISION to the width of the underlying type. */
11380 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11382 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11384 /* Convert each of the enumerators to the type of the underlying
11385 type of the enumeration. */
11386 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11388 location_t saved_location;
11390 decl = TREE_VALUE (values);
11391 saved_location = input_location;
11392 input_location = DECL_SOURCE_LOCATION (decl);
11393 if (fixed_underlying_type_p)
11394 /* If the enumeration type has a fixed underlying type, we
11395 already checked all of the enumerator values. */
11396 value = DECL_INITIAL (decl);
11398 value = perform_implicit_conversion (underlying_type,
11399 DECL_INITIAL (decl),
11400 tf_warning_or_error);
11401 input_location = saved_location;
11403 /* Do not clobber shared ints. */
11404 value = copy_node (value);
11406 TREE_TYPE (value) = enumtype;
11407 DECL_INITIAL (decl) = value;
11410 /* Fix up all variant types of this enum type. */
11411 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11413 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11414 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11415 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11416 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11417 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11418 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11419 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11420 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11421 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11422 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11423 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11426 /* Finish up the scope of a scoped enumeration. */
11427 if (SCOPED_ENUM_P (enumtype))
11430 /* Finish debugging output for this type. */
11431 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11434 /* Build and install a CONST_DECL for an enumeration constant of the
11435 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11436 Assignment of sequential values by default is handled here. */
11439 build_enumerator (tree name, tree value, tree enumtype)
11445 /* If the VALUE was erroneous, pretend it wasn't there; that will
11446 result in the enum being assigned the next value in sequence. */
11447 if (value == error_mark_node)
11450 /* Remove no-op casts from the value. */
11452 STRIP_TYPE_NOPS (value);
11454 if (! processing_template_decl)
11456 /* Validate and default VALUE. */
11457 if (value != NULL_TREE)
11459 value = integral_constant_value (value);
11461 if (TREE_CODE (value) == INTEGER_CST)
11463 value = perform_integral_promotions (value);
11464 constant_expression_warning (value);
11468 error ("enumerator value for %qD is not an integer constant", name);
11473 /* Default based on previous value. */
11474 if (value == NULL_TREE)
11476 if (TYPE_VALUES (enumtype))
11479 unsigned HOST_WIDE_INT lo;
11483 /* The next value is the previous value plus one.
11484 add_double doesn't know the type of the target expression,
11485 so we must check with int_fits_type_p as well. */
11486 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11487 if (error_operand_p (prev_value))
11488 value = error_mark_node;
11491 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11492 TREE_INT_CST_HIGH (prev_value),
11494 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11496 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11500 error ("overflow in enumeration values at %qD", name);
11501 value = error_mark_node;
11506 value = integer_zero_node;
11509 /* Remove no-op casts from the value. */
11510 STRIP_TYPE_NOPS (value);
11512 /* If the underlying type of the enum is fixed, check whether
11513 the enumerator values fits in the underlying type. If it
11514 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11515 if (ENUM_UNDERLYING_TYPE (enumtype)
11517 && TREE_CODE (value) == INTEGER_CST
11518 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11520 error ("enumerator value %E is too large for underlying type %<%T%>",
11521 value, ENUM_UNDERLYING_TYPE (enumtype));
11523 /* Silently convert the value so that we can continue. */
11524 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11529 /* C++ associates enums with global, function, or class declarations. */
11530 context = current_scope ();
11532 /* Build the actual enumeration constant. Note that the enumeration
11533 constants have the underlying type of the enum (if it is fixed)
11534 or the type of their initializer (if the underlying type of the
11535 enum is not fixed):
11539 If the underlying type is fixed, the type of each enumerator
11540 prior to the closing brace is the underlying type; if the
11541 initializing value of an enumerator cannot be represented by
11542 the underlying type, the program is ill-formed. If the
11543 underlying type is not fixed, the type of each enumerator is
11544 the type of its initializing value.
11546 If the underlying type is not fixed, it will be computed by
11547 finish_enum and we will reset the type of this enumerator. Of
11548 course, if we're processing a template, there may be no value. */
11549 type = value ? TREE_TYPE (value) : NULL_TREE;
11551 if (context && context == current_class_type)
11552 /* This enum declaration is local to the class. We need the full
11553 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11554 decl = build_lang_decl (CONST_DECL, name, type);
11556 /* It's a global enum, or it's local to a function. (Note local to
11557 a function could mean local to a class method. */
11558 decl = build_decl (input_location, CONST_DECL, name, type);
11560 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11561 TREE_CONSTANT (decl) = 1;
11562 TREE_READONLY (decl) = 1;
11563 DECL_INITIAL (decl) = value;
11565 if (context && context == current_class_type && !SCOPED_ENUM_P (enumtype))
11566 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11567 on the TYPE_FIELDS list for `S'. (That's so that you can say
11568 things like `S::i' later.) */
11569 finish_member_declaration (decl);
11573 /* Add this enumeration constant to the list for this type. */
11574 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11577 /* Look for an enumerator with the given NAME within the enumeration
11578 type ENUMTYPE. This routine is used primarily for qualified name
11579 lookup into an enumerator in C++0x, e.g.,
11581 enum class Color { Red, Green, Blue };
11583 Color color = Color::Red;
11585 Returns the value corresponding to the enumerator, or
11586 NULL_TREE if no such enumerator was found. */
11588 lookup_enumerator (tree enumtype, tree name)
11591 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11593 e = purpose_member (name, TYPE_VALUES (enumtype));
11594 return e? TREE_VALUE (e) : NULL_TREE;
11598 /* We're defining DECL. Make sure that its type is OK. */
11601 check_function_type (tree decl, tree current_function_parms)
11603 tree fntype = TREE_TYPE (decl);
11604 tree return_type = complete_type (TREE_TYPE (fntype));
11606 /* In a function definition, arg types must be complete. */
11607 require_complete_types_for_parms (current_function_parms);
11609 /* constexpr functions must have literal argument types and
11610 literal return type. */
11611 validate_constexpr_fundecl (decl);
11613 if (dependent_type_p (return_type))
11615 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11616 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11618 tree args = TYPE_ARG_TYPES (fntype);
11620 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11621 error ("return type %q#T is incomplete", return_type);
11623 error ("return type has Java class type %q#T", return_type);
11625 /* Make it return void instead. */
11626 if (TREE_CODE (fntype) == METHOD_TYPE)
11627 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11629 TREE_CHAIN (args));
11631 fntype = build_function_type (void_type_node, args);
11633 = build_exception_variant (fntype,
11634 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11635 fntype = (cp_build_type_attribute_variant
11636 (fntype, TYPE_ATTRIBUTES (TREE_TYPE (decl))));
11637 TREE_TYPE (decl) = fntype;
11640 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11643 /* Create the FUNCTION_DECL for a function definition.
11644 DECLSPECS and DECLARATOR are the parts of the declaration;
11645 they describe the function's name and the type it returns,
11646 but twisted together in a fashion that parallels the syntax of C.
11648 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11649 DECLARATOR is really the DECL for the function we are about to
11650 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11651 indicating that the function is an inline defined in-class.
11653 This function creates a binding context for the function body
11654 as well as setting up the FUNCTION_DECL in current_function_decl.
11656 For C++, we must first check whether that datum makes any sense.
11657 For example, "class A local_a(1,2);" means that variable local_a
11658 is an aggregate of type A, which should have a constructor
11659 applied to it with the argument list [1, 2].
11661 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11662 or may be a BLOCK if the function has been defined previously
11663 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11664 error_mark_node if the function has never been defined, or
11665 a BLOCK if the function has been defined somewhere. */
11668 start_preparsed_function (tree decl1, tree attrs, int flags)
11670 tree ctype = NULL_TREE;
11673 int doing_friend = 0;
11674 struct cp_binding_level *bl;
11675 tree current_function_parms;
11676 struct c_fileinfo *finfo
11677 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11678 bool honor_interface;
11680 /* Sanity check. */
11681 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11682 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11684 fntype = TREE_TYPE (decl1);
11685 if (TREE_CODE (fntype) == METHOD_TYPE)
11686 ctype = TYPE_METHOD_BASETYPE (fntype);
11688 /* ISO C++ 11.4/5. A friend function defined in a class is in
11689 the (lexical) scope of the class in which it is defined. */
11690 if (!ctype && DECL_FRIEND_P (decl1))
11692 ctype = DECL_FRIEND_CONTEXT (decl1);
11694 /* CTYPE could be null here if we're dealing with a template;
11695 for example, `inline friend float foo()' inside a template
11696 will have no CTYPE set. */
11697 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11703 if (DECL_DECLARED_INLINE_P (decl1)
11704 && lookup_attribute ("noinline", attrs))
11705 warning (0, "inline function %q+D given attribute noinline", decl1);
11707 /* Handle gnu_inline attribute. */
11708 if (GNU_INLINE_P (decl1))
11710 DECL_EXTERNAL (decl1) = 1;
11711 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11712 DECL_INTERFACE_KNOWN (decl1) = 1;
11713 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11716 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11717 /* This is a constructor, we must ensure that any default args
11718 introduced by this definition are propagated to the clones
11719 now. The clones are used directly in overload resolution. */
11720 adjust_clone_args (decl1);
11722 /* Sometimes we don't notice that a function is a static member, and
11723 build a METHOD_TYPE for it. Fix that up now. */
11724 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11725 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11727 revert_static_member_fn (decl1);
11731 /* Set up current_class_type, and enter the scope of the class, if
11734 push_nested_class (ctype);
11735 else if (DECL_STATIC_FUNCTION_P (decl1))
11736 push_nested_class (DECL_CONTEXT (decl1));
11738 /* Now that we have entered the scope of the class, we must restore
11739 the bindings for any template parameters surrounding DECL1, if it
11740 is an inline member template. (Order is important; consider the
11741 case where a template parameter has the same name as a field of
11742 the class.) It is not until after this point that
11743 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11744 if (flags & SF_INCLASS_INLINE)
11745 maybe_begin_member_template_processing (decl1);
11747 /* Effective C++ rule 15. */
11749 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11750 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11751 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11753 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11754 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11755 if (!DECL_INITIAL (decl1))
11756 DECL_INITIAL (decl1) = error_mark_node;
11758 /* This function exists in static storage.
11759 (This does not mean `static' in the C sense!) */
11760 TREE_STATIC (decl1) = 1;
11762 /* We must call push_template_decl after current_class_type is set
11763 up. (If we are processing inline definitions after exiting a
11764 class scope, current_class_type will be NULL_TREE until set above
11765 by push_nested_class.) */
11766 if (processing_template_decl)
11768 /* FIXME: Handle error_mark_node more gracefully. */
11769 tree newdecl1 = push_template_decl (decl1);
11770 if (newdecl1 != error_mark_node)
11774 /* We are now in the scope of the function being defined. */
11775 current_function_decl = decl1;
11777 /* Save the parm names or decls from this function's declarator
11778 where store_parm_decls will find them. */
11779 current_function_parms = DECL_ARGUMENTS (decl1);
11781 /* Make sure the parameter and return types are reasonable. When
11782 you declare a function, these types can be incomplete, but they
11783 must be complete when you define the function. */
11784 check_function_type (decl1, current_function_parms);
11786 /* Build the return declaration for the function. */
11787 restype = TREE_TYPE (fntype);
11788 if (DECL_RESULT (decl1) == NULL_TREE)
11792 resdecl = build_decl (input_location, RESULT_DECL, 0, restype);
11793 DECL_ARTIFICIAL (resdecl) = 1;
11794 DECL_IGNORED_P (resdecl) = 1;
11795 DECL_RESULT (decl1) = resdecl;
11797 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11800 /* Let the user know we're compiling this function. */
11801 announce_function (decl1);
11803 /* Record the decl so that the function name is defined.
11804 If we already have a decl for this name, and it is a FUNCTION_DECL,
11805 use the old decl. */
11806 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11808 /* A specialization is not used to guide overload resolution. */
11809 if (!DECL_FUNCTION_MEMBER_P (decl1)
11810 && !(DECL_USE_TEMPLATE (decl1) &&
11811 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11813 tree olddecl = pushdecl (decl1);
11815 if (olddecl == error_mark_node)
11816 /* If something went wrong when registering the declaration,
11817 use DECL1; we have to have a FUNCTION_DECL to use when
11818 parsing the body of the function. */
11822 /* Otherwise, OLDDECL is either a previous declaration
11823 of the same function or DECL1 itself. */
11825 if (warn_missing_declarations
11826 && olddecl == decl1
11827 && !DECL_MAIN_P (decl1)
11828 && TREE_PUBLIC (decl1)
11829 && !DECL_DECLARED_INLINE_P (decl1))
11833 /* Check whether DECL1 is in an anonymous
11835 for (context = DECL_CONTEXT (decl1);
11837 context = DECL_CONTEXT (context))
11839 if (TREE_CODE (context) == NAMESPACE_DECL
11840 && DECL_NAME (context) == NULL_TREE)
11844 if (context == NULL)
11845 warning (OPT_Wmissing_declarations,
11846 "no previous declaration for %q+D", decl1);
11854 /* We need to set the DECL_CONTEXT. */
11855 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11856 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11858 fntype = TREE_TYPE (decl1);
11860 /* If #pragma weak applies, mark the decl appropriately now.
11861 The pragma only applies to global functions. Because
11862 determining whether or not the #pragma applies involves
11863 computing the mangled name for the declaration, we cannot
11864 apply the pragma until after we have merged this declaration
11865 with any previous declarations; if the original declaration
11866 has a linkage specification, that specification applies to
11867 the definition as well, and may affect the mangled name. */
11868 if (!DECL_CONTEXT (decl1))
11869 maybe_apply_pragma_weak (decl1);
11872 /* Reset this in case the call to pushdecl changed it. */
11873 current_function_decl = decl1;
11875 gcc_assert (DECL_INITIAL (decl1));
11877 /* This function may already have been parsed, in which case just
11878 return; our caller will skip over the body without parsing. */
11879 if (DECL_INITIAL (decl1) != error_mark_node)
11882 /* Initialize RTL machinery. We cannot do this until
11883 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11884 even when processing a template; this is how we get
11885 CFUN set up, and our per-function variables initialized.
11886 FIXME factor out the non-RTL stuff. */
11887 bl = current_binding_level;
11888 allocate_struct_function (decl1, processing_template_decl);
11890 /* Initialize the language data structures. Whenever we start
11891 a new function, we destroy temporaries in the usual way. */
11892 cfun->language = GGC_CNEW (struct language_function);
11893 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11894 current_binding_level = bl;
11896 /* Even though we're inside a function body, we still don't want to
11897 call expand_expr to calculate the size of a variable-sized array.
11898 We haven't necessarily assigned RTL to all variables yet, so it's
11899 not safe to try to expand expressions involving them. */
11900 cfun->dont_save_pending_sizes_p = 1;
11902 /* Start the statement-tree, start the tree now. */
11903 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11905 /* If we are (erroneously) defining a function that we have already
11906 defined before, wipe out what we knew before. */
11907 if (!DECL_PENDING_INLINE_P (decl1))
11908 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11910 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11912 /* We know that this was set up by `grokclassfn'. We do not
11913 wait until `store_parm_decls', since evil parse errors may
11914 never get us to that point. Here we keep the consistency
11915 between `current_class_type' and `current_class_ptr'. */
11916 tree t = DECL_ARGUMENTS (decl1);
11918 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11919 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11921 cp_function_chain->x_current_class_ref
11922 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11923 cp_function_chain->x_current_class_ptr = t;
11925 /* Constructors and destructors need to know whether they're "in
11926 charge" of initializing virtual base classes. */
11927 t = TREE_CHAIN (t);
11928 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11930 current_in_charge_parm = t;
11931 t = TREE_CHAIN (t);
11933 if (DECL_HAS_VTT_PARM_P (decl1))
11935 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11936 current_vtt_parm = t;
11940 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11941 /* Implicitly-defined methods (like the
11942 destructor for a class in which no destructor
11943 is explicitly declared) must not be defined
11944 until their definition is needed. So, we
11945 ignore interface specifications for
11946 compiler-generated functions. */
11947 && !DECL_ARTIFICIAL (decl1));
11949 if (DECL_INTERFACE_KNOWN (decl1))
11951 tree ctx = decl_function_context (decl1);
11953 if (DECL_NOT_REALLY_EXTERN (decl1))
11954 DECL_EXTERNAL (decl1) = 0;
11956 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11957 && TREE_PUBLIC (ctx))
11958 /* This is a function in a local class in an extern inline
11960 comdat_linkage (decl1);
11962 /* If this function belongs to an interface, it is public.
11963 If it belongs to someone else's interface, it is also external.
11964 This only affects inlines and template instantiations. */
11965 else if (!finfo->interface_unknown && honor_interface)
11967 if (DECL_DECLARED_INLINE_P (decl1)
11968 || DECL_TEMPLATE_INSTANTIATION (decl1)
11969 || processing_template_decl)
11971 DECL_EXTERNAL (decl1)
11972 = (finfo->interface_only
11973 || (DECL_DECLARED_INLINE_P (decl1)
11974 && ! flag_implement_inlines
11975 && !DECL_VINDEX (decl1)));
11977 /* For WIN32 we also want to put these in linkonce sections. */
11978 maybe_make_one_only (decl1);
11981 DECL_EXTERNAL (decl1) = 0;
11982 DECL_INTERFACE_KNOWN (decl1) = 1;
11983 /* If this function is in an interface implemented in this file,
11984 make sure that the back end knows to emit this function
11986 if (!DECL_EXTERNAL (decl1))
11987 mark_needed (decl1);
11989 else if (finfo->interface_unknown && finfo->interface_only
11990 && honor_interface)
11992 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11993 interface, we will have both finfo->interface_unknown and
11994 finfo->interface_only set. In that case, we don't want to
11995 use the normal heuristics because someone will supply a
11996 #pragma implementation elsewhere, and deducing it here would
11997 produce a conflict. */
11998 comdat_linkage (decl1);
11999 DECL_EXTERNAL (decl1) = 0;
12000 DECL_INTERFACE_KNOWN (decl1) = 1;
12001 DECL_DEFER_OUTPUT (decl1) = 1;
12005 /* This is a definition, not a reference.
12006 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
12007 if (!GNU_INLINE_P (decl1))
12008 DECL_EXTERNAL (decl1) = 0;
12010 if ((DECL_DECLARED_INLINE_P (decl1)
12011 || DECL_TEMPLATE_INSTANTIATION (decl1))
12012 && ! DECL_INTERFACE_KNOWN (decl1)
12013 /* Don't try to defer nested functions for now. */
12014 && ! decl_function_context (decl1))
12015 DECL_DEFER_OUTPUT (decl1) = 1;
12017 DECL_INTERFACE_KNOWN (decl1) = 1;
12020 /* Determine the ELF visibility attribute for the function. We must not
12021 do this before calling "pushdecl", as we must allow "duplicate_decls"
12022 to merge any attributes appropriately. We also need to wait until
12024 if (!DECL_CLONED_FUNCTION_P (decl1))
12025 determine_visibility (decl1);
12027 begin_scope (sk_function_parms, decl1);
12031 if (DECL_DESTRUCTOR_P (decl1)
12032 || (DECL_CONSTRUCTOR_P (decl1)
12033 && targetm.cxx.cdtor_returns_this ()))
12035 cdtor_label = build_decl (input_location,
12036 LABEL_DECL, NULL_TREE, NULL_TREE);
12037 DECL_CONTEXT (cdtor_label) = current_function_decl;
12040 start_fname_decls ();
12042 store_parm_decls (current_function_parms);
12046 /* Like start_preparsed_function, except that instead of a
12047 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
12049 Returns 1 on success. If the DECLARATOR is not suitable for a function
12050 (it defines a datum instead), we return 0, which tells
12051 yyparse to report a parse error. */
12054 start_function (cp_decl_specifier_seq *declspecs,
12055 const cp_declarator *declarator,
12060 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
12061 if (decl1 == error_mark_node)
12063 /* If the declarator is not suitable for a function definition,
12064 cause a syntax error. */
12065 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
12067 error ("invalid function declaration");
12071 if (DECL_MAIN_P (decl1))
12072 /* main must return int. grokfndecl should have corrected it
12073 (and issued a diagnostic) if the user got it wrong. */
12074 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
12075 integer_type_node));
12077 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
12082 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
12086 use_eh_spec_block (tree fn)
12088 return (flag_exceptions && flag_enforce_eh_specs
12089 && !processing_template_decl
12090 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
12091 /* We insert the EH_SPEC_BLOCK only in the original
12092 function; then, it is copied automatically to the
12094 && !DECL_CLONED_FUNCTION_P (fn)
12095 /* Implicitly-generated constructors and destructors have
12096 exception specifications. However, those specifications
12097 are the union of the possible exceptions specified by the
12098 constructors/destructors for bases and members, so no
12099 unallowed exception will ever reach this function. By
12100 not creating the EH_SPEC_BLOCK we save a little memory,
12101 and we avoid spurious warnings about unreachable
12103 && !DECL_ARTIFICIAL (fn));
12106 /* Store the parameter declarations into the current function declaration.
12107 This is called after parsing the parameter declarations, before
12108 digesting the body of the function.
12110 Also install to binding contour return value identifier, if any. */
12113 store_parm_decls (tree current_function_parms)
12115 tree fndecl = current_function_decl;
12118 /* This is a chain of any other decls that came in among the parm
12119 declarations. If a parm is declared with enum {foo, bar} x;
12120 then CONST_DECLs for foo and bar are put here. */
12121 tree nonparms = NULL_TREE;
12123 if (current_function_parms)
12125 /* This case is when the function was defined with an ANSI prototype.
12126 The parms already have decls, so we need not do anything here
12127 except record them as in effect
12128 and complain if any redundant old-style parm decls were written. */
12130 tree specparms = current_function_parms;
12133 /* Must clear this because it might contain TYPE_DECLs declared
12135 current_binding_level->names = NULL;
12137 /* If we're doing semantic analysis, then we'll call pushdecl
12138 for each of these. We must do them in reverse order so that
12139 they end in the correct forward order. */
12140 specparms = nreverse (specparms);
12142 for (parm = specparms; parm; parm = next)
12144 next = TREE_CHAIN (parm);
12145 if (TREE_CODE (parm) == PARM_DECL)
12147 if (DECL_NAME (parm) == NULL_TREE
12148 || TREE_CODE (parm) != VOID_TYPE)
12151 error ("parameter %qD declared void", parm);
12155 /* If we find an enum constant or a type tag,
12156 put it aside for the moment. */
12157 TREE_CHAIN (parm) = NULL_TREE;
12158 nonparms = chainon (nonparms, parm);
12162 /* Get the decls in their original chain order and record in the
12163 function. This is all and only the PARM_DECLs that were
12164 pushed into scope by the loop above. */
12165 DECL_ARGUMENTS (fndecl) = getdecls ();
12168 DECL_ARGUMENTS (fndecl) = NULL_TREE;
12170 /* Now store the final chain of decls for the arguments
12171 as the decl-chain of the current lexical scope.
12172 Put the enumerators in as well, at the front so that
12173 DECL_ARGUMENTS is not modified. */
12174 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
12176 if (use_eh_spec_block (current_function_decl))
12177 current_eh_spec_block = begin_eh_spec_block ();
12181 /* We have finished doing semantic analysis on DECL, but have not yet
12182 generated RTL for its body. Save away our current state, so that
12183 when we want to generate RTL later we know what to do. */
12186 save_function_data (tree decl)
12188 struct language_function *f;
12190 /* Save the language-specific per-function data so that we can
12191 get it back when we really expand this function. */
12192 gcc_assert (!DECL_PENDING_INLINE_P (decl));
12195 f = GGC_NEW (struct language_function);
12196 memcpy (f, cp_function_chain, sizeof (struct language_function));
12197 DECL_SAVED_FUNCTION_DATA (decl) = f;
12199 /* Clear out the bits we don't need. */
12200 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
12201 f->bindings = NULL;
12202 f->x_local_names = NULL;
12206 /* Set the return value of the constructor (if present). */
12209 finish_constructor_body (void)
12214 if (targetm.cxx.cdtor_returns_this ()
12215 && (! TYPE_FOR_JAVA (current_class_type)))
12217 /* Any return from a constructor will end up here. */
12218 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12220 val = DECL_ARGUMENTS (current_function_decl);
12221 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12222 DECL_RESULT (current_function_decl), val);
12223 /* Return the address of the object. */
12224 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12225 add_stmt (exprstmt);
12229 /* Do all the processing for the beginning of a destructor; set up the
12230 vtable pointers and cleanups for bases and members. */
12233 begin_destructor_body (void)
12235 tree compound_stmt;
12237 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
12238 issued an error message. We still want to try to process the
12239 body of the function, but initialize_vtbl_ptrs will crash if
12240 TYPE_BINFO is NULL. */
12241 if (COMPLETE_TYPE_P (current_class_type))
12243 compound_stmt = begin_compound_stmt (0);
12244 /* Make all virtual function table pointers in non-virtual base
12245 classes point to CURRENT_CLASS_TYPE's virtual function
12247 initialize_vtbl_ptrs (current_class_ptr);
12248 finish_compound_stmt (compound_stmt);
12250 /* And insert cleanups for our bases and members so that they
12251 will be properly destroyed if we throw. */
12252 push_base_cleanups ();
12256 /* At the end of every destructor we generate code to delete the object if
12257 necessary. Do that now. */
12260 finish_destructor_body (void)
12264 /* Any return from a destructor will end up here; that way all base
12265 and member cleanups will be run when the function returns. */
12266 add_stmt (build_stmt (input_location, LABEL_EXPR, cdtor_label));
12268 /* In a virtual destructor, we must call delete. */
12269 if (DECL_VIRTUAL_P (current_function_decl))
12272 tree virtual_size = cxx_sizeof (current_class_type);
12276 At the point of definition of a virtual destructor (including
12277 an implicit definition), non-placement operator delete shall
12278 be looked up in the scope of the destructor's class and if
12279 found shall be accessible and unambiguous. */
12280 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12282 /*global_p=*/false,
12283 /*placement=*/NULL_TREE,
12284 /*alloc_fn=*/NULL_TREE);
12286 if_stmt = begin_if_stmt ();
12287 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12288 current_in_charge_parm,
12291 finish_expr_stmt (exprstmt);
12292 finish_then_clause (if_stmt);
12293 finish_if_stmt (if_stmt);
12296 if (targetm.cxx.cdtor_returns_this ())
12300 val = DECL_ARGUMENTS (current_function_decl);
12301 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12302 DECL_RESULT (current_function_decl), val);
12303 /* Return the address of the object. */
12304 exprstmt = build_stmt (input_location, RETURN_EXPR, val);
12305 add_stmt (exprstmt);
12309 /* Do the necessary processing for the beginning of a function body, which
12310 in this case includes member-initializers, but not the catch clauses of
12311 a function-try-block. Currently, this means opening a binding level
12312 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12315 begin_function_body (void)
12319 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12322 if (processing_template_decl)
12323 /* Do nothing now. */;
12325 /* Always keep the BLOCK node associated with the outermost pair of
12326 curly braces of a function. These are needed for correct
12327 operation of dwarfout.c. */
12328 keep_next_level (true);
12330 stmt = begin_compound_stmt (BCS_FN_BODY);
12332 if (processing_template_decl)
12333 /* Do nothing now. */;
12334 else if (DECL_DESTRUCTOR_P (current_function_decl))
12335 begin_destructor_body ();
12340 /* Do the processing for the end of a function body. Currently, this means
12341 closing out the cleanups for fully-constructed bases and members, and in
12342 the case of the destructor, deleting the object if desired. Again, this
12343 is only meaningful for [cd]tors, since they are the only functions where
12344 there is a significant distinction between the main body and any
12345 function catch clauses. Handling, say, main() return semantics here
12346 would be wrong, as flowing off the end of a function catch clause for
12347 main() would also need to return 0. */
12350 finish_function_body (tree compstmt)
12352 if (compstmt == NULL_TREE)
12355 /* Close the block. */
12356 finish_compound_stmt (compstmt);
12358 if (processing_template_decl)
12359 /* Do nothing now. */;
12360 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12361 finish_constructor_body ();
12362 else if (DECL_DESTRUCTOR_P (current_function_decl))
12363 finish_destructor_body ();
12366 /* Given a function, returns the BLOCK corresponding to the outermost level
12367 of curly braces, skipping the artificial block created for constructor
12371 outer_curly_brace_block (tree fndecl)
12373 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12374 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12375 /* Skip the artificial function body block. */
12376 block = BLOCK_SUBBLOCKS (block);
12380 /* Finish up a function declaration and compile that function
12381 all the way to assembler language output. The free the storage
12382 for the function definition.
12384 FLAGS is a bitwise or of the following values:
12386 We just finished processing the body of an in-class inline
12387 function definition. (This processing will have taken place
12388 after the class definition is complete.) */
12391 finish_function (int flags)
12393 tree fndecl = current_function_decl;
12394 tree fntype, ctype = NULL_TREE;
12395 int inclass_inline = (flags & 2) != 0;
12398 /* When we get some parse errors, we can end up without a
12399 current_function_decl, so cope. */
12400 if (fndecl == NULL_TREE)
12401 return error_mark_node;
12403 gcc_assert (!defer_mark_used_calls);
12404 defer_mark_used_calls = true;
12406 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12407 && DECL_VIRTUAL_P (fndecl)
12408 && !processing_template_decl)
12410 tree fnclass = DECL_CONTEXT (fndecl);
12411 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12412 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12415 nested = function_depth > 1;
12416 fntype = TREE_TYPE (fndecl);
12418 /* TREE_READONLY (fndecl) = 1;
12419 This caused &foo to be of type ptr-to-const-function
12420 which then got a warning when stored in a ptr-to-function variable. */
12422 gcc_assert (building_stmt_tree ());
12423 /* The current function is being defined, so its DECL_INITIAL should
12424 be set, and unless there's a multiple definition, it should be
12425 error_mark_node. */
12426 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12428 /* For a cloned function, we've already got all the code we need;
12429 there's no need to add any extra bits. */
12430 if (!DECL_CLONED_FUNCTION_P (fndecl))
12432 if (DECL_MAIN_P (current_function_decl))
12436 /* Make it so that `main' always returns 0 by default (or
12439 stmt = finish_return_stmt (integer_one_node);
12441 stmt = finish_return_stmt (integer_zero_node);
12443 /* Hack. We don't want the middle-end to warn that this
12444 return is unreachable, so put the statement on the
12447 location_t linezero = linemap_line_start (line_table, 0, 1);
12448 SET_EXPR_LOCATION (stmt, linezero);
12452 if (use_eh_spec_block (current_function_decl))
12453 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12454 (TREE_TYPE (current_function_decl)),
12455 current_eh_spec_block);
12458 /* If we're saving up tree structure, tie off the function now. */
12459 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12461 finish_fname_decls ();
12463 /* If this function can't throw any exceptions, remember that. */
12464 if (!processing_template_decl
12465 && !cp_function_chain->can_throw
12466 && !flag_non_call_exceptions
12467 && !DECL_REPLACEABLE_P (fndecl))
12468 TREE_NOTHROW (fndecl) = 1;
12470 /* This must come after expand_function_end because cleanups might
12471 have declarations (from inline functions) that need to go into
12472 this function's blocks. */
12474 /* If the current binding level isn't the outermost binding level
12475 for this function, either there is a bug, or we have experienced
12476 syntax errors and the statement tree is malformed. */
12477 if (current_binding_level->kind != sk_function_parms)
12479 /* Make sure we have already experienced errors. */
12480 gcc_assert (errorcount);
12482 /* Throw away the broken statement tree and extra binding
12484 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12486 while (current_binding_level->kind != sk_function_parms)
12488 if (current_binding_level->kind == sk_class)
12489 pop_nested_class ();
12491 poplevel (0, 0, 0);
12494 poplevel (1, 0, 1);
12496 /* Statements should always be full-expressions at the outermost set
12497 of curly braces for a function. */
12498 gcc_assert (stmts_are_full_exprs_p ());
12500 /* Set up the named return value optimization, if we can. Candidate
12501 variables are selected in check_return_expr. */
12502 if (current_function_return_value)
12504 tree r = current_function_return_value;
12507 if (r != error_mark_node
12508 /* This is only worth doing for fns that return in memory--and
12509 simpler, since we don't have to worry about promoted modes. */
12510 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12511 /* Only allow this for variables declared in the outer scope of
12512 the function so we know that their lifetime always ends with a
12513 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12514 we were to do this optimization in tree-ssa. */
12515 && (outer = outer_curly_brace_block (fndecl))
12516 && chain_member (r, BLOCK_VARS (outer)))
12517 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12519 current_function_return_value = NULL_TREE;
12522 /* Remember that we were in class scope. */
12523 if (current_class_name)
12524 ctype = current_class_type;
12526 /* Must mark the RESULT_DECL as being in this function. */
12527 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12529 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12530 to the FUNCTION_DECL node itself. */
12531 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12533 /* Save away current state, if appropriate. */
12534 if (!processing_template_decl)
12535 save_function_data (fndecl);
12537 /* Complain if there's just no return statement. */
12538 if (warn_return_type
12539 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12540 && !dependent_type_p (TREE_TYPE (fntype))
12541 && !current_function_returns_value && !current_function_returns_null
12542 /* Don't complain if we abort or throw. */
12543 && !current_function_returns_abnormally
12544 && !DECL_NAME (DECL_RESULT (fndecl))
12545 && !TREE_NO_WARNING (fndecl)
12546 /* Structor return values (if any) are set by the compiler. */
12547 && !DECL_CONSTRUCTOR_P (fndecl)
12548 && !DECL_DESTRUCTOR_P (fndecl))
12550 warning (OPT_Wreturn_type,
12551 "no return statement in function returning non-void");
12552 TREE_NO_WARNING (fndecl) = 1;
12555 /* Store the end of the function, so that we get good line number
12556 info for the epilogue. */
12557 cfun->function_end_locus = input_location;
12559 /* Genericize before inlining. */
12560 if (!processing_template_decl)
12562 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12563 invoke_plugin_callbacks (PLUGIN_CXX_CP_PRE_GENERICIZE, fndecl);
12564 cp_genericize (fndecl);
12565 /* Clear out the bits we don't need. */
12566 f->x_current_class_ptr = NULL;
12567 f->x_current_class_ref = NULL;
12568 f->x_eh_spec_block = NULL;
12569 f->x_in_charge_parm = NULL;
12570 f->x_vtt_parm = NULL;
12571 f->x_return_value = NULL;
12572 f->bindings = NULL;
12573 f->extern_decl_map = NULL;
12575 /* Clear out the bits we don't need. */
12576 local_names = NULL;
12578 /* We're leaving the context of this function, so zap cfun. It's still in
12579 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12581 current_function_decl = NULL;
12583 /* If this is an in-class inline definition, we may have to pop the
12584 bindings for the template parameters that we added in
12585 maybe_begin_member_template_processing when start_function was
12587 if (inclass_inline)
12588 maybe_end_member_template_processing ();
12590 /* Leave the scope of the class. */
12592 pop_nested_class ();
12598 /* Let the error reporting routines know that we're outside a
12599 function. For a nested function, this value is used in
12600 cxx_pop_function_context and then reset via pop_function_context. */
12601 current_function_decl = NULL_TREE;
12603 defer_mark_used_calls = false;
12604 if (deferred_mark_used_calls)
12609 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12611 VEC_free (tree, gc, deferred_mark_used_calls);
12617 /* Create the FUNCTION_DECL for a function definition.
12618 DECLSPECS and DECLARATOR are the parts of the declaration;
12619 they describe the return type and the name of the function,
12620 but twisted together in a fashion that parallels the syntax of C.
12622 This function creates a binding context for the function body
12623 as well as setting up the FUNCTION_DECL in current_function_decl.
12625 Returns a FUNCTION_DECL on success.
12627 If the DECLARATOR is not suitable for a function (it defines a datum
12628 instead), we return 0, which tells yyparse to report a parse error.
12630 May return void_type_node indicating that this method is actually
12631 a friend. See grokfield for more details.
12633 Came here with a `.pushlevel' .
12635 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12636 CHANGES TO CODE IN `grokfield'. */
12639 grokmethod (cp_decl_specifier_seq *declspecs,
12640 const cp_declarator *declarator, tree attrlist)
12642 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12645 if (fndecl == error_mark_node)
12646 return error_mark_node;
12648 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12650 error ("invalid member function declaration");
12651 return error_mark_node;
12655 cplus_decl_attributes (&fndecl, attrlist, 0);
12657 /* Pass friends other than inline friend functions back. */
12658 if (fndecl == void_type_node)
12661 if (DECL_IN_AGGR_P (fndecl))
12663 if (DECL_CONTEXT (fndecl)
12664 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12665 error ("%qD is already defined in class %qT", fndecl,
12666 DECL_CONTEXT (fndecl));
12667 return error_mark_node;
12670 check_template_shadow (fndecl);
12672 DECL_DECLARED_INLINE_P (fndecl) = 1;
12673 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12675 /* We process method specializations in finish_struct_1. */
12676 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12678 fndecl = push_template_decl (fndecl);
12679 if (fndecl == error_mark_node)
12683 if (! DECL_FRIEND_P (fndecl))
12685 if (TREE_CHAIN (fndecl))
12687 fndecl = copy_node (fndecl);
12688 TREE_CHAIN (fndecl) = NULL_TREE;
12692 cp_finish_decl (fndecl, NULL_TREE, false, NULL_TREE, 0);
12694 DECL_IN_AGGR_P (fndecl) = 1;
12699 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12700 we can lay it out later, when and if its type becomes complete. */
12703 maybe_register_incomplete_var (tree var)
12705 gcc_assert (TREE_CODE (var) == VAR_DECL);
12707 /* Keep track of variables with incomplete types. */
12708 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12709 && DECL_EXTERNAL (var))
12711 tree inner_type = TREE_TYPE (var);
12713 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12714 inner_type = TREE_TYPE (inner_type);
12715 inner_type = TYPE_MAIN_VARIANT (inner_type);
12717 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12718 /* RTTI TD entries are created while defining the type_info. */
12719 || (TYPE_LANG_SPECIFIC (inner_type)
12720 && TYPE_BEING_DEFINED (inner_type)))
12721 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12725 /* Called when a class type (given by TYPE) is defined. If there are
12726 any existing VAR_DECLs whose type has been completed by this
12727 declaration, update them now. */
12730 complete_vars (tree type)
12732 tree *list = &incomplete_vars;
12734 gcc_assert (CLASS_TYPE_P (type));
12737 if (same_type_p (type, TREE_PURPOSE (*list)))
12739 tree var = TREE_VALUE (*list);
12740 tree type = TREE_TYPE (var);
12741 /* Complete the type of the variable. The VAR_DECL itself
12742 will be laid out in expand_expr. */
12743 complete_type (type);
12744 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12745 /* Remove this entry from the list. */
12746 *list = TREE_CHAIN (*list);
12749 list = &TREE_CHAIN (*list);
12752 /* Check for pending declarations which may have abstract type. */
12753 complete_type_check_abstract (type);
12756 /* If DECL is of a type which needs a cleanup, build and return an
12757 expression to perform that cleanup here. Return NULL_TREE if no
12758 cleanup need be done. */
12761 cxx_maybe_build_cleanup (tree decl)
12767 /* Assume no cleanup is required. */
12768 cleanup = NULL_TREE;
12770 if (error_operand_p (decl))
12773 /* Handle "__attribute__((cleanup))". We run the cleanup function
12774 before the destructor since the destructor is what actually
12775 terminates the lifetime of the object. */
12776 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12783 /* Get the name specified by the user for the cleanup function. */
12784 id = TREE_VALUE (TREE_VALUE (attr));
12785 /* Look up the name to find the cleanup function to call. It is
12786 important to use lookup_name here because that is what is
12787 used in c-common.c:handle_cleanup_attribute when performing
12788 initial checks on the attribute. Note that those checks
12789 include ensuring that the function found is not an overloaded
12790 function, or an object with an overloaded call operator,
12791 etc.; we can rely on the fact that the function found is an
12792 ordinary FUNCTION_DECL. */
12793 fn = lookup_name (id);
12794 arg = build_address (decl);
12796 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12798 tf_warning_or_error);
12800 /* Handle ordinary C++ destructors. */
12801 type = TREE_TYPE (decl);
12802 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12804 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12805 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12806 && CLASSTYPE_VBASECLASSES (type));
12810 if (TREE_CODE (type) == ARRAY_TYPE)
12813 addr = build_address (decl);
12815 /* Optimize for space over speed here. */
12816 if (!has_vbases || flag_expensive_optimizations)
12817 flags |= LOOKUP_NONVIRTUAL;
12819 call = build_delete (TREE_TYPE (addr), addr,
12820 sfk_complete_destructor, flags, 0);
12822 cleanup = build_compound_expr (input_location, cleanup, call);
12830 /* When a stmt has been parsed, this function is called. */
12837 /* Return the FUNCTION_TYPE that corresponds to MEMFNTYPE, which can be a
12838 FUNCTION_DECL, METHOD_TYPE, FUNCTION_TYPE, pointer or reference to
12839 METHOD_TYPE or FUNCTION_TYPE, or pointer to member function. */
12842 static_fn_type (tree memfntype)
12848 if (TYPE_PTRMEMFUNC_P (memfntype))
12849 memfntype = TYPE_PTRMEMFUNC_FN_TYPE (memfntype);
12850 if (POINTER_TYPE_P (memfntype)
12851 || TREE_CODE (memfntype) == FUNCTION_DECL)
12852 memfntype = TREE_TYPE (memfntype);
12853 if (TREE_CODE (memfntype) == FUNCTION_TYPE)
12855 gcc_assert (TREE_CODE (memfntype) == METHOD_TYPE);
12856 args = TYPE_ARG_TYPES (memfntype);
12857 fntype = build_function_type (TREE_TYPE (memfntype), TREE_CHAIN (args));
12858 quals = cp_type_quals (TREE_TYPE (TREE_VALUE (args)));
12859 fntype = build_qualified_type (fntype, quals);
12860 fntype = (cp_build_type_attribute_variant
12861 (fntype, TYPE_ATTRIBUTES (memfntype)));
12862 fntype = (build_exception_variant
12863 (fntype, TYPE_RAISES_EXCEPTIONS (memfntype)));
12867 /* DECL was originally constructed as a non-static member function,
12868 but turned out to be static. Update it accordingly. */
12871 revert_static_member_fn (tree decl)
12873 TREE_TYPE (decl) = static_fn_type (decl);
12875 if (cp_type_quals (TREE_TYPE (decl)) != TYPE_UNQUALIFIED)
12876 error ("static member function %q#D declared with type qualifiers", decl);
12878 if (DECL_ARGUMENTS (decl))
12879 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12880 DECL_STATIC_FUNCTION_P (decl) = 1;
12883 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12884 one of the language-independent trees. */
12886 enum cp_tree_node_structure_enum
12887 cp_tree_node_structure (union lang_tree_node * t)
12889 switch (TREE_CODE (&t->generic))
12891 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12892 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12893 case OVERLOAD: return TS_CP_OVERLOAD;
12894 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12895 case PTRMEM_CST: return TS_CP_PTRMEM;
12896 case BASELINK: return TS_CP_BASELINK;
12897 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12898 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12899 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12900 case LAMBDA_EXPR: return TS_CP_LAMBDA_EXPR;
12901 case TEMPLATE_INFO: return TS_CP_TEMPLATE_INFO;
12902 default: return TS_CP_GENERIC;
12906 /* Build the void_list_node (void_type_node having been created). */
12908 build_void_list_node (void)
12910 tree t = build_tree_list (NULL_TREE, void_type_node);
12915 cp_missing_noreturn_ok_p (tree decl)
12917 /* A missing noreturn is ok for the `main' function. */
12918 return DECL_MAIN_P (decl);
12921 /* Return the COMDAT group into which DECL should be placed. */
12924 cxx_comdat_group (tree decl)
12928 /* Virtual tables, construction virtual tables, and virtual table
12929 tables all go in a single COMDAT group, named after the primary
12931 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12932 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12933 /* For all other DECLs, the COMDAT group is the mangled name of the
12934 declaration itself. */
12937 while (DECL_THUNK_P (decl))
12939 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12940 into the same section as the target function. In that case
12941 we must return target's name. */
12942 tree target = THUNK_TARGET (decl);
12943 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12944 && DECL_SECTION_NAME (target) != NULL
12945 && DECL_ONE_ONLY (target))
12950 name = DECL_ASSEMBLER_NAME (decl);
12956 #include "gt-cp-decl.h"