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
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
57 static tree grokparms (cp_parameter_declarator *, tree *);
58 static const char *redeclaration_error_message (tree, tree);
60 static int decl_jump_unsafe (tree);
61 static void require_complete_types_for_parms (tree);
62 static int ambi_op_p (enum tree_code);
63 static int unary_op_p (enum tree_code);
64 static void push_local_name (tree);
65 static tree grok_reference_init (tree, tree, tree, tree *);
66 static tree grokvardecl (tree, tree, const cp_decl_specifier_seq *,
68 static void record_unknown_type (tree, const char *);
69 static tree builtin_function_1 (tree, tree);
70 static tree build_library_fn_1 (tree, enum tree_code, tree);
71 static int member_function_or_else (tree, tree, enum overload_flags);
72 static void bad_specifiers (tree, const char *, int, int, int, int,
74 static void check_for_uninitialized_const_var (tree);
75 static hashval_t typename_hash (const void *);
76 static int typename_compare (const void *, const void *);
77 static tree local_variable_p_walkfn (tree *, int *, void *);
78 static tree record_builtin_java_type (const char *, int);
79 static const char *tag_name (enum tag_types);
80 static tree lookup_and_check_tag (enum tag_types, tree, tag_scope, bool);
81 static int walk_namespaces_r (tree, walk_namespaces_fn, void *);
82 static void maybe_deduce_size_from_array_init (tree, tree);
83 static void layout_var_decl (tree);
84 static void maybe_commonize_var (tree);
85 static tree check_initializer (tree, tree, int, tree *);
86 static void make_rtl_for_nonlocal_decl (tree, tree, const char *);
87 static void save_function_data (tree);
88 static void check_function_type (tree, tree);
89 static void finish_constructor_body (void);
90 static void begin_destructor_body (void);
91 static void finish_destructor_body (void);
92 static tree create_array_type_for_decl (tree, tree, tree);
93 static tree get_atexit_node (void);
94 static tree get_dso_handle_node (void);
95 static tree start_cleanup_fn (void);
96 static void end_cleanup_fn (void);
97 static tree cp_make_fname_decl (tree, int);
98 static void initialize_predefined_identifiers (void);
99 static tree check_special_function_return_type
100 (special_function_kind, tree, tree);
101 static tree push_cp_library_fn (enum tree_code, tree);
102 static tree build_cp_library_fn (tree, enum tree_code, tree);
103 static void store_parm_decls (tree);
104 static void initialize_local_var (tree, tree);
105 static void expand_static_init (tree, tree);
106 static tree next_initializable_field (tree);
108 /* The following symbols are subsumed in the cp_global_trees array, and
109 listed here individually for documentation purposes.
112 tree wchar_decl_node;
114 tree vtable_entry_type;
115 tree delta_type_node;
116 tree __t_desc_type_node;
118 tree class_type_node;
119 tree unknown_type_node;
121 Array type `vtable_entry_type[]'
124 tree vtbl_ptr_type_node;
131 A FUNCTION_DECL which can call `abort'. Not necessarily the
132 one that the user will declare, but sufficient to be called
133 by routines that want to abort the program.
137 The FUNCTION_DECL for the default `::operator delete'.
139 tree global_delete_fndecl;
142 tree type_info_type_node, tinfo_decl_id, tinfo_decl_type;
143 tree tinfo_var_id; */
145 tree cp_global_trees[CPTI_MAX];
147 /* Indicates that there is a type value in some namespace, although
148 that is not necessarily in scope at the moment. */
150 tree global_type_node;
152 /* The node that holds the "name" of the global scope. */
153 tree global_scope_name;
155 #define local_names cp_function_chain->x_local_names
157 /* A list of objects which have constructors or destructors
158 which reside in the global scope. The decl is stored in
159 the TREE_VALUE slot and the initializer is stored
160 in the TREE_PURPOSE slot. */
161 tree static_aggregates;
165 /* A node for the integer constants 2, and 3. */
167 tree integer_two_node, integer_three_node;
169 /* Used only for jumps to as-yet undefined labels, since jumps to
170 defined labels can have their validity checked immediately. */
172 struct named_label_use_entry GTY(())
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 named_label_entry GTY(())
197 /* The decl itself. */
200 /* The binding level to which the label is *currently* attached.
201 This is initially set to the binding level in which the label
202 is defined, but is modified as scopes are closed. */
203 struct cp_binding_level *binding_level;
204 /* The head of the names list that was current when the label was
205 defined, or the inner scope popped. These are the decls that will
206 be skipped when jumping to the label. */
208 /* A tree list of all decls from all binding levels that would be
209 crossed by a backward branch to the label. */
212 /* A list of uses of the label, before the label is defined. */
213 struct named_label_use_entry *uses;
215 /* The following bits are set after the label is defined, and are
216 updated as scopes are popped. They indicate that a backward jump
217 to the label will illegally enter a scope of the given flavor. */
223 #define named_labels cp_function_chain->x_named_labels
225 /* The number of function bodies which we are currently processing.
226 (Zero if we are at namespace scope, one inside the body of a
227 function, two inside the body of a function in a local class, etc.) */
230 /* States indicating how grokdeclarator() should handle declspecs marked
231 with __attribute__((deprecated)). An object declared as
232 __attribute__((deprecated)) suppresses warnings of uses of other
235 enum deprecated_states {
240 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
243 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
244 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
245 time the VAR_DECL was declared, the type was incomplete. */
247 static GTY(()) tree incomplete_vars;
249 /* Returns the kind of template specialization we are currently
250 processing, given that it's declaration contained N_CLASS_SCOPES
251 explicit scope qualifications. */
254 current_tmpl_spec_kind (int n_class_scopes)
256 int n_template_parm_scopes = 0;
257 int seen_specialization_p = 0;
258 int innermost_specialization_p = 0;
259 struct cp_binding_level *b;
261 /* Scan through the template parameter scopes. */
262 for (b = current_binding_level;
263 b->kind == sk_template_parms;
266 /* If we see a specialization scope inside a parameter scope,
267 then something is wrong. That corresponds to a declaration
270 template <class T> template <> ...
272 which is always invalid since [temp.expl.spec] forbids the
273 specialization of a class member template if the enclosing
274 class templates are not explicitly specialized as well. */
275 if (b->explicit_spec_p)
277 if (n_template_parm_scopes == 0)
278 innermost_specialization_p = 1;
280 seen_specialization_p = 1;
282 else if (seen_specialization_p == 1)
283 return tsk_invalid_member_spec;
285 ++n_template_parm_scopes;
288 /* Handle explicit instantiations. */
289 if (processing_explicit_instantiation)
291 if (n_template_parm_scopes != 0)
292 /* We've seen a template parameter list during an explicit
293 instantiation. For example:
295 template <class T> template void f(int);
297 This is erroneous. */
298 return tsk_invalid_expl_inst;
300 return tsk_expl_inst;
303 if (n_template_parm_scopes < n_class_scopes)
304 /* We've not seen enough template headers to match all the
305 specialized classes present. For example:
307 template <class T> void R<T>::S<T>::f(int);
309 This is invalid; there needs to be one set of template
310 parameters for each class. */
311 return tsk_insufficient_parms;
312 else if (n_template_parm_scopes == n_class_scopes)
313 /* We're processing a non-template declaration (even though it may
314 be a member of a template class.) For example:
316 template <class T> void S<T>::f(int);
318 The `class T' maches the `S<T>', leaving no template headers
319 corresponding to the `f'. */
321 else if (n_template_parm_scopes > n_class_scopes + 1)
322 /* We've got too many template headers. For example:
324 template <> template <class T> void f (T);
326 There need to be more enclosing classes. */
327 return tsk_excessive_parms;
329 /* This must be a template. It's of the form:
331 template <class T> template <class U> void S<T>::f(U);
333 This is a specialization if the innermost level was a
334 specialization; otherwise it's just a definition of the
336 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
339 /* Exit the current scope. */
347 /* When a label goes out of scope, check to see if that label was used
348 in a valid manner, and issue any appropriate warnings or errors. */
351 pop_label (tree label, tree old_value)
353 if (!processing_template_decl)
355 if (DECL_INITIAL (label) == NULL_TREE)
359 error ("label %q+D used but not defined", label);
360 #ifdef USE_MAPPED_LOCATION
361 location = input_location; /* FIXME want (input_filename, (line)0) */
363 location.file = input_filename;
366 /* Avoid crashing later. */
367 define_label (location, DECL_NAME (label));
370 warn_for_unused_label (label);
373 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
376 /* At the end of a function, all labels declared within the function
377 go out of scope. BLOCK is the top-level block for the
381 pop_labels_1 (void **slot, void *data)
383 struct named_label_entry *ent = (struct named_label_entry *) *slot;
384 tree block = (tree) data;
386 pop_label (ent->label_decl, NULL_TREE);
388 /* Put the labels into the "variables" of the top-level block,
389 so debugger can see them. */
390 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
391 BLOCK_VARS (block) = ent->label_decl;
393 htab_clear_slot (named_labels, slot);
399 pop_labels (tree block)
403 htab_traverse (named_labels, pop_labels_1, block);
408 /* At the end of a block with local labels, restore the outer definition. */
411 pop_local_label (tree label, tree old_value)
413 struct named_label_entry dummy;
416 pop_label (label, old_value);
418 dummy.label_decl = label;
419 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
420 htab_clear_slot (named_labels, slot);
423 /* The following two routines are used to interface to Objective-C++.
424 The binding level is purposely treated as an opaque type. */
427 objc_get_current_scope (void)
429 return current_binding_level;
432 /* The following routine is used by the NeXT-style SJLJ exceptions;
433 variables get marked 'volatile' so as to not be clobbered by
434 _setjmp()/_longjmp() calls. All variables in the current scope,
435 as well as parent scopes up to (but not including) ENCLOSING_BLK
436 shall be thusly marked. */
439 objc_mark_locals_volatile (void *enclosing_blk)
441 struct cp_binding_level *scope;
443 for (scope = current_binding_level;
444 scope && scope != enclosing_blk;
445 scope = scope->level_chain)
449 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
450 objc_volatilize_decl (decl);
452 /* Do not climb up past the current function. */
453 if (scope->kind == sk_function_parms)
458 /* Update data for defined and undefined labels when leaving a scope. */
461 poplevel_named_label_1 (void **slot, void *data)
463 struct named_label_entry *ent = (struct named_label_entry *) *slot;
464 struct cp_binding_level *bl = (struct cp_binding_level *) data;
465 struct cp_binding_level *obl = bl->level_chain;
467 if (ent->binding_level == bl)
471 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
472 if (decl_jump_unsafe (decl))
473 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
475 ent->binding_level = obl;
476 ent->names_in_scope = obl->names;
480 ent->in_try_scope = true;
483 ent->in_catch_scope = true;
486 ent->in_omp_scope = true;
494 struct named_label_use_entry *use;
496 for (use = ent->uses; use ; use = use->next)
497 if (use->binding_level == bl)
499 use->binding_level = obl;
500 use->names_in_scope = obl->names;
501 if (bl->kind == sk_omp)
502 use->in_omp_scope = true;
509 /* Exit a binding level.
510 Pop the level off, and restore the state of the identifier-decl mappings
511 that were in effect when this level was entered.
513 If KEEP == 1, this level had explicit declarations, so
514 and create a "block" (a BLOCK node) for the level
515 to record its declarations and subblocks for symbol table output.
517 If FUNCTIONBODY is nonzero, this level is the body of a function,
518 so create a block as if KEEP were set and also clear out all
521 If REVERSE is nonzero, reverse the order of decls before putting
522 them into the BLOCK. */
525 poplevel (int keep, int reverse, int functionbody)
528 /* The chain of decls was accumulated in reverse order.
529 Put it into forward order, just for cleanliness. */
531 int tmp = functionbody;
532 int real_functionbody;
536 int leaving_for_scope;
539 timevar_push (TV_NAME_LOOKUP);
544 gcc_assert (current_binding_level->kind != sk_class);
546 real_functionbody = (current_binding_level->kind == sk_cleanup
547 ? ((functionbody = 0), tmp) : functionbody);
548 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
550 gcc_assert (!VEC_length(cp_class_binding,
551 current_binding_level->class_shadowed));
553 /* We used to use KEEP == 2 to indicate that the new block should go
554 at the beginning of the list of blocks at this binding level,
555 rather than the end. This hack is no longer used. */
556 gcc_assert (keep == 0 || keep == 1);
558 if (current_binding_level->keep)
561 /* Any uses of undefined labels, and any defined labels, now operate
562 under constraints of next binding contour. */
563 if (cfun && !functionbody && named_labels)
564 htab_traverse (named_labels, poplevel_named_label_1,
565 current_binding_level);
567 /* Get the decls in the order they were written.
568 Usually current_binding_level->names is in reverse order.
569 But parameter decls were previously put in forward order. */
572 current_binding_level->names
573 = decls = nreverse (current_binding_level->names);
575 decls = current_binding_level->names;
577 /* If there were any declarations or structure tags in that level,
578 or if this level is a function body,
579 create a BLOCK to record them for the life of this function. */
581 if (keep == 1 || functionbody)
582 block = make_node (BLOCK);
583 if (block != NULL_TREE)
585 BLOCK_VARS (block) = decls;
586 BLOCK_SUBBLOCKS (block) = subblocks;
589 /* In each subblock, record that this is its superior. */
591 for (link = subblocks; link; link = BLOCK_CHAIN (link))
592 BLOCK_SUPERCONTEXT (link) = block;
594 /* We still support the old for-scope rules, whereby the variables
595 in a for-init statement were in scope after the for-statement
596 ended. We only use the new rules if flag_new_for_scope is
599 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
601 /* Before we remove the declarations first check for unused variables. */
602 if (warn_unused_variable
603 && !processing_template_decl)
604 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
605 if (TREE_CODE (decl) == VAR_DECL
606 && ! TREE_USED (decl)
607 && ! DECL_IN_SYSTEM_HEADER (decl)
608 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
609 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
611 /* Remove declarations for all the DECLs in this level. */
612 for (link = decls; link; link = TREE_CHAIN (link))
614 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
617 tree name = DECL_NAME (link);
621 ob = outer_binding (name,
622 IDENTIFIER_BINDING (name),
625 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
627 ns_binding = NULL_TREE;
629 if (ob && ob->scope == current_binding_level->level_chain)
630 /* We have something like:
635 and we are leaving the `for' scope. There's no reason to
636 keep the binding of the inner `i' in this case. */
637 pop_binding (name, link);
638 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
639 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
640 /* Here, we have something like:
648 We must pop the for-scope binding so we know what's a
649 type and what isn't. */
650 pop_binding (name, link);
653 /* Mark this VAR_DECL as dead so that we can tell we left it
654 there only for backward compatibility. */
655 DECL_DEAD_FOR_LOCAL (link) = 1;
657 /* Keep track of what should have happened when we
658 popped the binding. */
661 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
662 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
665 /* Add it to the list of dead variables in the next
666 outermost binding to that we can remove these when we
667 leave that binding. */
668 current_binding_level->level_chain->dead_vars_from_for
669 = tree_cons (NULL_TREE, link,
670 current_binding_level->level_chain->
673 /* Although we don't pop the cxx_binding, we do clear
674 its SCOPE since the scope is going away now. */
675 IDENTIFIER_BINDING (name)->scope
676 = current_binding_level->level_chain;
683 /* Remove the binding. */
686 if (TREE_CODE (decl) == TREE_LIST)
687 decl = TREE_VALUE (decl);
690 if (TREE_CODE (name) == OVERLOAD)
691 name = OVL_FUNCTION (name);
693 gcc_assert (DECL_P (name));
694 pop_binding (DECL_NAME (name), decl);
698 /* Remove declarations for any `for' variables from inner scopes
699 that we kept around. */
700 for (link = current_binding_level->dead_vars_from_for;
701 link; link = TREE_CHAIN (link))
702 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
704 /* Restore the IDENTIFIER_TYPE_VALUEs. */
705 for (link = current_binding_level->type_shadowed;
706 link; link = TREE_CHAIN (link))
707 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
709 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
710 for (link = current_binding_level->shadowed_labels;
712 link = TREE_CHAIN (link))
713 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
715 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
716 list if a `using' declaration put them there. The debugging
717 back ends won't understand OVERLOAD, so we remove them here.
718 Because the BLOCK_VARS are (temporarily) shared with
719 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
720 popped all the bindings. */
725 for (d = &BLOCK_VARS (block); *d; )
727 if (TREE_CODE (*d) == TREE_LIST)
728 *d = TREE_CHAIN (*d);
730 d = &TREE_CHAIN (*d);
734 /* If the level being exited is the top level of a function,
735 check over all the labels. */
738 /* Since this is the top level block of a function, the vars are
739 the function's parameters. Don't leave them in the BLOCK
740 because they are found in the FUNCTION_DECL instead. */
741 BLOCK_VARS (block) = 0;
745 kind = current_binding_level->kind;
746 if (kind == sk_cleanup)
750 /* If this is a temporary binding created for a cleanup, then we'll
751 have pushed a statement list level. Pop that, create a new
752 BIND_EXPR for the block, and insert it into the stream. */
753 stmt = pop_stmt_list (current_binding_level->statement_list);
754 stmt = c_build_bind_expr (block, stmt);
761 /* The current function is being defined, so its DECL_INITIAL
762 should be error_mark_node. */
763 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
764 DECL_INITIAL (current_function_decl) = block;
767 current_binding_level->blocks
768 = chainon (current_binding_level->blocks, block);
770 /* If we did not make a block for the level just exited,
771 any blocks made for inner levels
772 (since they cannot be recorded as subblocks in that level)
773 must be carried forward so they will later become subblocks
774 of something else. */
776 current_binding_level->blocks
777 = chainon (current_binding_level->blocks, subblocks);
779 /* Each and every BLOCK node created here in `poplevel' is important
780 (e.g. for proper debugging information) so if we created one
781 earlier, mark it as "used". */
783 TREE_USED (block) = 1;
785 /* All temporary bindings created for cleanups are popped silently. */
786 if (kind == sk_cleanup)
789 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
792 /* Insert BLOCK at the end of the list of subblocks of the
793 current binding level. This is used when a BIND_EXPR is expanded,
794 to handle the BLOCK node inside the BIND_EXPR. */
797 insert_block (tree block)
799 TREE_USED (block) = 1;
800 current_binding_level->blocks
801 = chainon (current_binding_level->blocks, block);
804 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
805 itself, calling F for each. The DATA is passed to F as well. */
808 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
811 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
813 result |= (*f) (namespace, data);
815 for (; current; current = TREE_CHAIN (current))
816 result |= walk_namespaces_r (current, f, data);
821 /* Walk all the namespaces, calling F for each. The DATA is passed to
825 walk_namespaces (walk_namespaces_fn f, void* data)
827 return walk_namespaces_r (global_namespace, f, data);
830 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
831 DATA is non-NULL, this is the last time we will call
832 wrapup_global_declarations for this NAMESPACE. */
835 wrapup_globals_for_namespace (tree namespace, void* data)
837 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
838 VEC(tree,gc) *statics = level->static_decls;
839 tree *vec = VEC_address (tree, statics);
840 int len = VEC_length (tree, statics);
841 int last_time = (data != 0);
845 check_global_declarations (vec, len);
846 emit_debug_global_declarations (vec, len);
850 /* Write out any globals that need to be output. */
851 return wrapup_global_declarations (vec, len);
855 /* In C++, you don't have to write `struct S' to refer to `S'; you
856 can just use `S'. We accomplish this by creating a TYPE_DECL as
857 if the user had written `typedef struct S S'. Create and return
858 the TYPE_DECL for TYPE. */
861 create_implicit_typedef (tree name, tree type)
865 decl = build_decl (TYPE_DECL, name, type);
866 DECL_ARTIFICIAL (decl) = 1;
867 /* There are other implicit type declarations, like the one *within*
868 a class that allows you to write `S::S'. We must distinguish
870 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
871 TYPE_NAME (type) = decl;
876 /* Remember a local name for name-mangling purposes. */
879 push_local_name (tree decl)
884 timevar_push (TV_NAME_LOOKUP);
886 name = DECL_NAME (decl);
888 nelts = VEC_length (tree, local_names);
889 for (i = 0; i < nelts; i++)
891 t = VEC_index (tree, local_names, i);
892 if (DECL_NAME (t) == name)
894 if (!DECL_LANG_SPECIFIC (decl))
895 retrofit_lang_decl (decl);
896 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
897 if (DECL_LANG_SPECIFIC (t))
898 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
900 DECL_DISCRIMINATOR (decl) = 1;
902 VEC_replace (tree, local_names, i, decl);
903 timevar_pop (TV_NAME_LOOKUP);
908 VEC_safe_push (tree, gc, local_names, decl);
909 timevar_pop (TV_NAME_LOOKUP);
912 /* Subroutine of duplicate_decls: return truthvalue of whether
913 or not types of these decls match.
915 For C++, we must compare the parameter list so that `int' can match
916 `int&' in a parameter position, but `int&' is not confused with
920 decls_match (tree newdecl, tree olddecl)
924 if (newdecl == olddecl)
927 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
928 /* If the two DECLs are not even the same kind of thing, we're not
929 interested in their types. */
932 if (TREE_CODE (newdecl) == FUNCTION_DECL)
934 tree f1 = TREE_TYPE (newdecl);
935 tree f2 = TREE_TYPE (olddecl);
936 tree p1 = TYPE_ARG_TYPES (f1);
937 tree p2 = TYPE_ARG_TYPES (f2);
939 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
940 && ! (DECL_EXTERN_C_P (newdecl)
941 && DECL_EXTERN_C_P (olddecl)))
944 if (TREE_CODE (f1) != TREE_CODE (f2))
947 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
949 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
950 && (DECL_BUILT_IN (olddecl)
951 #ifndef NO_IMPLICIT_EXTERN_C
952 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
953 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
957 types_match = self_promoting_args_p (p1);
958 if (p1 == void_list_node)
959 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
961 #ifndef NO_IMPLICIT_EXTERN_C
962 else if (p1 == NULL_TREE
963 && (DECL_EXTERN_C_P (olddecl)
964 && DECL_IN_SYSTEM_HEADER (olddecl)
965 && !DECL_CLASS_SCOPE_P (olddecl))
966 && (DECL_EXTERN_C_P (newdecl)
967 && DECL_IN_SYSTEM_HEADER (newdecl)
968 && !DECL_CLASS_SCOPE_P (newdecl)))
970 types_match = self_promoting_args_p (p2);
971 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
975 types_match = compparms (p1, p2);
980 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
982 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
983 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
986 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
987 DECL_TEMPLATE_PARMS (olddecl)))
990 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
991 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
992 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
994 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
995 DECL_TEMPLATE_RESULT (newdecl));
999 /* Need to check scope for variable declaration (VAR_DECL).
1000 For typedef (TYPE_DECL), scope is ignored. */
1001 if (TREE_CODE (newdecl) == VAR_DECL
1002 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
1004 Two declarations for an object with C language linkage
1005 with the same name (ignoring the namespace that qualify
1006 it) that appear in different namespace scopes refer to
1008 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1011 if (TREE_TYPE (newdecl) == error_mark_node)
1012 types_match = TREE_TYPE (olddecl) == error_mark_node;
1013 else if (TREE_TYPE (olddecl) == NULL_TREE)
1014 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1015 else if (TREE_TYPE (newdecl) == NULL_TREE)
1018 types_match = cp_comptypes (TREE_TYPE (newdecl),
1019 TREE_TYPE (olddecl),
1020 COMPARE_REDECLARATION);
1026 /* If NEWDECL is `static' and an `extern' was seen previously,
1027 warn about it. OLDDECL is the previous declaration.
1029 Note that this does not apply to the C++ case of declaring
1030 a variable `extern const' and then later `const'.
1032 Don't complain about built-in functions, since they are beyond
1033 the user's control. */
1036 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1040 if (TREE_CODE (newdecl) == TYPE_DECL
1041 || TREE_CODE (newdecl) == TEMPLATE_DECL
1042 || TREE_CODE (newdecl) == CONST_DECL
1043 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1046 /* Don't get confused by static member functions; that's a different
1048 if (TREE_CODE (newdecl) == FUNCTION_DECL
1049 && DECL_STATIC_FUNCTION_P (newdecl))
1052 /* If the old declaration was `static', or the new one isn't, then
1053 then everything is OK. */
1054 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1057 /* It's OK to declare a builtin function as `static'. */
1058 if (TREE_CODE (olddecl) == FUNCTION_DECL
1059 && DECL_ARTIFICIAL (olddecl))
1062 name = DECL_ASSEMBLER_NAME (newdecl);
1063 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1064 pedwarn ("previous declaration of %q+D", olddecl);
1067 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1068 function templates. If their exception specifications do not
1069 match, issue a diagnostic. */
1072 check_redeclaration_exception_specification (tree new_decl,
1077 tree new_exceptions;
1078 tree old_exceptions;
1080 new_type = TREE_TYPE (new_decl);
1081 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1082 old_type = TREE_TYPE (old_decl);
1083 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1087 If any declaration of a function has an exception-specification,
1088 all declarations, including the definition and an explicit
1089 specialization, of that function shall have an
1090 exception-specification with the same set of type-ids. */
1091 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1092 && ! DECL_IS_BUILTIN (old_decl)
1094 && !comp_except_specs (new_exceptions, old_exceptions,
1097 error ("declaration of %qF throws different exceptions", new_decl);
1098 error ("from previous declaration %q+F", old_decl);
1102 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1103 && lookup_attribute ("gnu_inline", \
1104 DECL_ATTRIBUTES (fn)))
1106 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1107 If the redeclaration is invalid, a diagnostic is issued, and the
1108 error_mark_node is returned. Otherwise, OLDDECL is returned.
1110 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1113 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1116 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1118 unsigned olddecl_uid = DECL_UID (olddecl);
1119 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1120 int new_defines_function = 0;
1123 if (newdecl == olddecl)
1126 types_match = decls_match (newdecl, olddecl);
1128 /* If either the type of the new decl or the type of the old decl is an
1129 error_mark_node, then that implies that we have already issued an
1130 error (earlier) for some bogus type specification, and in that case,
1131 it is rather pointless to harass the user with yet more error message
1132 about the same declaration, so just pretend the types match here. */
1133 if (TREE_TYPE (newdecl) == error_mark_node
1134 || TREE_TYPE (olddecl) == error_mark_node)
1135 return error_mark_node;
1137 if (DECL_P (olddecl)
1138 && TREE_CODE (newdecl) == FUNCTION_DECL
1139 && TREE_CODE (olddecl) == FUNCTION_DECL
1140 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1142 if (DECL_DECLARED_INLINE_P (newdecl)
1143 && DECL_UNINLINABLE (newdecl)
1144 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1145 /* Already warned elsewhere. */;
1146 else if (DECL_DECLARED_INLINE_P (olddecl)
1147 && DECL_UNINLINABLE (olddecl)
1148 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1149 /* Already warned. */;
1150 else if (DECL_DECLARED_INLINE_P (newdecl)
1151 && DECL_UNINLINABLE (olddecl)
1152 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1154 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1156 warning (OPT_Wattributes, "previous declaration of %q+D "
1157 "with attribute noinline", olddecl);
1159 else if (DECL_DECLARED_INLINE_P (olddecl)
1160 && DECL_UNINLINABLE (newdecl)
1161 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1163 warning (OPT_Wattributes, "function %q+D redeclared with "
1164 "attribute noinline", newdecl);
1165 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1170 /* Check for redeclaration and other discrepancies. */
1171 if (TREE_CODE (olddecl) == FUNCTION_DECL
1172 && DECL_ARTIFICIAL (olddecl))
1174 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1175 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1177 /* Avoid warnings redeclaring built-ins which have not been
1178 explicitly declared. */
1179 if (DECL_ANTICIPATED (olddecl))
1182 /* If you declare a built-in or predefined function name as static,
1183 the old definition is overridden, but optionally warn this was a
1184 bad choice of name. */
1185 if (! TREE_PUBLIC (newdecl))
1187 warning (OPT_Wshadow, "shadowing %s function %q#D",
1188 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1190 /* Discard the old built-in function. */
1193 /* If the built-in is not ansi, then programs can override
1194 it even globally without an error. */
1195 else if (! DECL_BUILT_IN (olddecl))
1196 warning (0, "library function %q#D redeclared as non-function %q#D",
1200 error ("declaration of %q#D", newdecl);
1201 error ("conflicts with built-in declaration %q#D",
1206 else if (!types_match)
1208 /* Avoid warnings redeclaring built-ins which have not been
1209 explicitly declared. */
1210 if (DECL_ANTICIPATED (olddecl))
1212 /* Deal with fileptr_type_node. FILE type is not known
1213 at the time we create the builtins. */
1216 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1217 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1219 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1222 else if (TREE_VALUE (t2) == fileptr_type_node)
1224 tree t = TREE_VALUE (t1);
1226 if (TREE_CODE (t) == POINTER_TYPE
1227 && TYPE_NAME (TREE_TYPE (t))
1228 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1229 == get_identifier ("FILE")
1230 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1232 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1234 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1235 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1236 types_match = decls_match (newdecl, olddecl);
1238 return duplicate_decls (newdecl, olddecl,
1240 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1243 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1246 else if ((DECL_EXTERN_C_P (newdecl)
1247 && DECL_EXTERN_C_P (olddecl))
1248 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1249 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1251 /* A near match; override the builtin. */
1253 if (TREE_PUBLIC (newdecl))
1255 warning (0, "new declaration %q#D", newdecl);
1256 warning (0, "ambiguates built-in declaration %q#D",
1260 warning (OPT_Wshadow, "shadowing %s function %q#D",
1261 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1265 /* Discard the old built-in function. */
1268 /* Replace the old RTL to avoid problems with inlining. */
1269 COPY_DECL_RTL (newdecl, olddecl);
1271 /* Even if the types match, prefer the new declarations type for
1272 built-ins which have not been explicitly declared, for
1273 exception lists, etc... */
1274 else if (DECL_ANTICIPATED (olddecl))
1276 tree type = TREE_TYPE (newdecl);
1277 tree attribs = (*targetm.merge_type_attributes)
1278 (TREE_TYPE (olddecl), type);
1280 type = cp_build_type_attribute_variant (type, attribs);
1281 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1284 /* If a function is explicitly declared "throw ()", propagate that to
1285 the corresponding builtin. */
1286 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1287 && DECL_ANTICIPATED (olddecl)
1288 && TREE_NOTHROW (newdecl)
1289 && !TREE_NOTHROW (olddecl)
1290 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1291 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1293 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1295 /* Whether or not the builtin can throw exceptions has no
1296 bearing on this declarator. */
1297 TREE_NOTHROW (olddecl) = 0;
1299 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1301 /* If a builtin function is redeclared as `static', merge
1302 the declarations, but make the original one static. */
1303 DECL_THIS_STATIC (olddecl) = 1;
1304 TREE_PUBLIC (olddecl) = 0;
1306 /* Make the old declaration consistent with the new one so
1307 that all remnants of the builtin-ness of this function
1308 will be banished. */
1309 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1310 COPY_DECL_RTL (newdecl, olddecl);
1313 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1315 /* C++ Standard, 3.3, clause 4:
1316 "[Note: a namespace name or a class template name must be unique
1317 in its declarative region (7.3.2, clause 14). ]" */
1318 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1319 && TREE_CODE (newdecl) != NAMESPACE_DECL
1320 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1321 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1322 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1323 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1325 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1326 && TREE_CODE (newdecl) != TYPE_DECL)
1327 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1328 && TREE_CODE (olddecl) != TYPE_DECL))
1330 /* We do nothing special here, because C++ does such nasty
1331 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1332 get shadowed, and know that if we need to find a TYPE_DECL
1333 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1334 slot of the identifier. */
1338 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1339 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1340 || (TREE_CODE (olddecl) == FUNCTION_DECL
1341 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1345 error ("%q#D redeclared as different kind of symbol", newdecl);
1346 if (TREE_CODE (olddecl) == TREE_LIST)
1347 olddecl = TREE_VALUE (olddecl);
1348 error ("previous declaration of %q+#D", olddecl);
1350 return error_mark_node;
1352 else if (!types_match)
1354 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1355 /* These are certainly not duplicate declarations; they're
1356 from different scopes. */
1359 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1361 /* The name of a class template may not be declared to refer to
1362 any other template, class, function, object, namespace, value,
1363 or type in the same scope. */
1364 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1365 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1367 error ("declaration of template %q#D", newdecl);
1368 error ("conflicts with previous declaration %q+#D", olddecl);
1370 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1371 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1372 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1373 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1374 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1375 DECL_TEMPLATE_PARMS (olddecl))
1376 /* Template functions can be disambiguated by
1378 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1379 TREE_TYPE (TREE_TYPE (olddecl))))
1381 error ("new declaration %q#D", newdecl);
1382 error ("ambiguates old declaration %q+#D", olddecl);
1386 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1388 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1390 error ("declaration of C function %q#D conflicts with",
1392 error ("previous declaration %q+#D here", olddecl);
1394 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1395 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1397 error ("new declaration %q#D", newdecl);
1398 error ("ambiguates old declaration %q+#D", olddecl);
1399 return error_mark_node;
1406 error ("conflicting declaration %q#D", newdecl);
1407 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1408 return error_mark_node;
1411 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1412 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1413 && (!DECL_TEMPLATE_INFO (newdecl)
1414 || (DECL_TI_TEMPLATE (newdecl)
1415 != DECL_TI_TEMPLATE (olddecl))))
1416 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1417 && (!DECL_TEMPLATE_INFO (olddecl)
1418 || (DECL_TI_TEMPLATE (olddecl)
1419 != DECL_TI_TEMPLATE (newdecl))))))
1420 /* It's OK to have a template specialization and a non-template
1421 with the same type, or to have specializations of two
1422 different templates with the same type. Note that if one is a
1423 specialization, and the other is an instantiation of the same
1424 template, that we do not exit at this point. That situation
1425 can occur if we instantiate a template class, and then
1426 specialize one of its methods. This situation is valid, but
1427 the declarations must be merged in the usual way. */
1429 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1430 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1431 && !DECL_USE_TEMPLATE (newdecl))
1432 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1433 && !DECL_USE_TEMPLATE (olddecl))))
1434 /* One of the declarations is a template instantiation, and the
1435 other is not a template at all. That's OK. */
1437 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1439 /* In [namespace.alias] we have:
1441 In a declarative region, a namespace-alias-definition can be
1442 used to redefine a namespace-alias declared in that declarative
1443 region to refer only to the namespace to which it already
1446 Therefore, if we encounter a second alias directive for the same
1447 alias, we can just ignore the second directive. */
1448 if (DECL_NAMESPACE_ALIAS (newdecl)
1449 && (DECL_NAMESPACE_ALIAS (newdecl)
1450 == DECL_NAMESPACE_ALIAS (olddecl)))
1452 /* [namespace.alias]
1454 A namespace-name or namespace-alias shall not be declared as
1455 the name of any other entity in the same declarative region.
1456 A namespace-name defined at global scope shall not be
1457 declared as the name of any other entity in any global scope
1459 error ("declaration of namespace %qD conflicts with", newdecl);
1460 error ("previous declaration of namespace %q+D here", olddecl);
1461 return error_mark_node;
1465 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1468 error (errmsg, newdecl);
1469 if (DECL_NAME (olddecl) != NULL_TREE)
1470 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1471 ? "%q+#D previously defined here"
1472 : "%q+#D previously declared here", olddecl);
1473 return error_mark_node;
1475 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1476 && DECL_INITIAL (olddecl) != NULL_TREE
1477 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1478 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1480 /* Prototype decl follows defn w/o prototype. */
1481 warning (0, "prototype for %q+#D", newdecl);
1482 warning (0, "%Jfollows non-prototype definition here", olddecl);
1484 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1485 || TREE_CODE (olddecl) == VAR_DECL)
1486 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1489 If two declarations of the same function or object
1490 specify different linkage-specifications ..., the program
1491 is ill-formed.... Except for functions with C++ linkage,
1492 a function declaration without a linkage specification
1493 shall not precede the first linkage specification for
1494 that function. A function can be declared without a
1495 linkage specification after an explicit linkage
1496 specification has been seen; the linkage explicitly
1497 specified in the earlier declaration is not affected by
1498 such a function declaration.
1500 DR 563 raises the question why the restrictions on
1501 functions should not also apply to objects. Older
1502 versions of G++ silently ignore the linkage-specification
1510 which is clearly wrong. Therefore, we now treat objects
1512 if (current_lang_depth () == 0)
1514 /* There is no explicit linkage-specification, so we use
1515 the linkage from the previous declaration. */
1516 if (!DECL_LANG_SPECIFIC (newdecl))
1517 retrofit_lang_decl (newdecl);
1518 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1522 error ("previous declaration of %q+#D with %qL linkage",
1523 olddecl, DECL_LANGUAGE (olddecl));
1524 error ("conflicts with new declaration with %qL linkage",
1525 DECL_LANGUAGE (newdecl));
1529 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1531 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1533 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1534 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1537 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1538 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1540 for (; t1 && t1 != void_list_node;
1541 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1542 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1544 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1547 pedwarn ("default argument given for parameter %d of %q#D",
1549 pedwarn ("after previous specification in %q+#D", olddecl);
1553 error ("default argument given for parameter %d of %q#D",
1555 error ("after previous specification in %q+#D",
1560 if (DECL_DECLARED_INLINE_P (newdecl)
1561 && ! DECL_DECLARED_INLINE_P (olddecl)
1562 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1564 warning (0, "%q#D was used before it was declared inline", newdecl);
1565 warning (0, "%Jprevious non-inline declaration here", olddecl);
1570 /* Do not merge an implicit typedef with an explicit one. In:
1574 typedef class A A __attribute__ ((foo));
1576 the attribute should apply only to the typedef. */
1577 if (TREE_CODE (olddecl) == TYPE_DECL
1578 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1579 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1582 /* If new decl is `static' and an `extern' was seen previously,
1584 warn_extern_redeclared_static (newdecl, olddecl);
1586 /* We have committed to returning 1 at this point. */
1587 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1589 /* Now that functions must hold information normally held
1590 by field decls, there is extra work to do so that
1591 declaration information does not get destroyed during
1593 if (DECL_VINDEX (olddecl))
1594 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1595 if (DECL_CONTEXT (olddecl))
1596 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1597 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1598 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1599 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1600 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1601 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1602 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1603 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1604 SET_OVERLOADED_OPERATOR_CODE
1605 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1606 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1608 /* Optionally warn about more than one declaration for the same
1609 name, but don't warn about a function declaration followed by a
1611 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1612 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1613 /* Don't warn about extern decl followed by definition. */
1614 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1615 /* Don't warn about friends, let add_friend take care of it. */
1616 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1618 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1619 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1623 /* Deal with C++: must preserve virtual function table size. */
1624 if (TREE_CODE (olddecl) == TYPE_DECL)
1626 tree newtype = TREE_TYPE (newdecl);
1627 tree oldtype = TREE_TYPE (olddecl);
1629 if (newtype != error_mark_node && oldtype != error_mark_node
1630 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1631 CLASSTYPE_FRIEND_CLASSES (newtype)
1632 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1634 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1637 /* Copy all the DECL_... slots specified in the new decl
1638 except for any that we copy here from the old type. */
1639 DECL_ATTRIBUTES (newdecl)
1640 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1642 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1646 old_result = DECL_TEMPLATE_RESULT (olddecl);
1647 new_result = DECL_TEMPLATE_RESULT (newdecl);
1648 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1649 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1650 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1651 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1653 DECL_ATTRIBUTES (old_result)
1654 = (*targetm.merge_decl_attributes) (old_result, new_result);
1656 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1658 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1659 && DECL_INITIAL (new_result))
1661 if (DECL_INITIAL (old_result))
1663 DECL_INLINE (old_result) = 0;
1664 DECL_UNINLINABLE (old_result) = 1;
1668 DECL_INLINE (old_result) = DECL_INLINE (new_result);
1669 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1671 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1672 DECL_NOT_REALLY_EXTERN (old_result)
1673 = DECL_NOT_REALLY_EXTERN (new_result);
1674 DECL_INTERFACE_KNOWN (old_result)
1675 = DECL_INTERFACE_KNOWN (new_result);
1676 DECL_DECLARED_INLINE_P (old_result)
1677 = DECL_DECLARED_INLINE_P (new_result);
1678 DECL_DISREGARD_INLINE_LIMITS (old_result)
1679 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1684 DECL_INLINE (old_result)
1685 |= DECL_INLINE (new_result);
1686 DECL_DECLARED_INLINE_P (old_result)
1687 |= DECL_DECLARED_INLINE_P (new_result);
1688 DECL_DISREGARD_INLINE_LIMITS (old_result)
1689 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1690 check_redeclaration_exception_specification (newdecl, olddecl);
1694 /* If the new declaration is a definition, update the file and
1695 line information on the declaration, and also make
1696 the old declaration the same definition. */
1697 if (DECL_INITIAL (new_result) != NULL_TREE)
1699 DECL_SOURCE_LOCATION (olddecl)
1700 = DECL_SOURCE_LOCATION (old_result)
1701 = DECL_SOURCE_LOCATION (newdecl);
1702 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1703 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1704 DECL_ARGUMENTS (old_result)
1705 = DECL_ARGUMENTS (new_result);
1713 /* Automatically handles default parameters. */
1714 tree oldtype = TREE_TYPE (olddecl);
1717 /* Merge the data types specified in the two decls. */
1718 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1720 /* If merge_types produces a non-typedef type, just use the old type. */
1721 if (TREE_CODE (newdecl) == TYPE_DECL
1722 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1725 if (TREE_CODE (newdecl) == VAR_DECL)
1727 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1728 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1729 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1730 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1731 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1732 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1734 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1735 if (DECL_LANG_SPECIFIC (olddecl)
1736 && CP_DECL_THREADPRIVATE_P (olddecl))
1738 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1739 if (!DECL_LANG_SPECIFIC (newdecl))
1740 retrofit_lang_decl (newdecl);
1742 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1743 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1747 /* Do this after calling `merge_types' so that default
1748 parameters don't confuse us. */
1749 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1750 check_redeclaration_exception_specification (newdecl, olddecl);
1751 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1753 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1754 check_default_args (newdecl);
1756 /* Lay the type out, unless already done. */
1757 if (! same_type_p (newtype, oldtype)
1758 && TREE_TYPE (newdecl) != error_mark_node
1759 && !(processing_template_decl && uses_template_parms (newdecl)))
1760 layout_type (TREE_TYPE (newdecl));
1762 if ((TREE_CODE (newdecl) == VAR_DECL
1763 || TREE_CODE (newdecl) == PARM_DECL
1764 || TREE_CODE (newdecl) == RESULT_DECL
1765 || TREE_CODE (newdecl) == FIELD_DECL
1766 || TREE_CODE (newdecl) == TYPE_DECL)
1767 && !(processing_template_decl && uses_template_parms (newdecl)))
1768 layout_decl (newdecl, 0);
1770 /* Merge the type qualifiers. */
1771 if (TREE_READONLY (newdecl))
1772 TREE_READONLY (olddecl) = 1;
1773 if (TREE_THIS_VOLATILE (newdecl))
1774 TREE_THIS_VOLATILE (olddecl) = 1;
1775 if (TREE_NOTHROW (newdecl))
1776 TREE_NOTHROW (olddecl) = 1;
1778 /* Merge deprecatedness. */
1779 if (TREE_DEPRECATED (newdecl))
1780 TREE_DEPRECATED (olddecl) = 1;
1782 /* Merge the initialization information. */
1783 if (DECL_INITIAL (newdecl) == NULL_TREE
1784 && DECL_INITIAL (olddecl) != NULL_TREE)
1786 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1787 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1788 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1789 && DECL_LANG_SPECIFIC (newdecl)
1790 && DECL_LANG_SPECIFIC (olddecl))
1792 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1793 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1797 /* Merge the section attribute.
1798 We want to issue an error if the sections conflict but that must be
1799 done later in decl_attributes since we are called before attributes
1801 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1802 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1804 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1806 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1807 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1808 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1809 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1810 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1811 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1812 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1813 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1814 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1815 /* Keep the old RTL. */
1816 COPY_DECL_RTL (olddecl, newdecl);
1818 else if (TREE_CODE (newdecl) == VAR_DECL
1819 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1821 /* Keep the old RTL. We cannot keep the old RTL if the old
1822 declaration was for an incomplete object and the new
1823 declaration is not since many attributes of the RTL will
1825 COPY_DECL_RTL (olddecl, newdecl);
1828 /* If cannot merge, then use the new type and qualifiers,
1829 and don't preserve the old rtl. */
1832 /* Clean out any memory we had of the old declaration. */
1833 tree oldstatic = value_member (olddecl, static_aggregates);
1835 TREE_VALUE (oldstatic) = error_mark_node;
1837 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1838 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1839 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1840 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1843 /* Merge the storage class information. */
1844 merge_weak (newdecl, olddecl);
1846 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1847 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1848 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1849 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1850 if (! DECL_EXTERNAL (olddecl))
1851 DECL_EXTERNAL (newdecl) = 0;
1853 new_template = NULL_TREE;
1854 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1856 bool new_redefines_gnu_inline = false;
1858 if (new_defines_function
1859 && ((DECL_INTERFACE_KNOWN (olddecl)
1860 && TREE_CODE (olddecl) == FUNCTION_DECL)
1861 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1862 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1863 == FUNCTION_DECL))))
1867 if (TREE_CODE (fn) == TEMPLATE_DECL)
1868 fn = DECL_TEMPLATE_RESULT (olddecl);
1870 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1873 if (!new_redefines_gnu_inline)
1875 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1876 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1877 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1879 DECL_TEMPLATE_INSTANTIATED (newdecl)
1880 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1882 /* If the OLDDECL is an instantiation and/or specialization,
1883 then the NEWDECL must be too. But, it may not yet be marked
1884 as such if the caller has created NEWDECL, but has not yet
1885 figured out that it is a redeclaration. */
1886 if (!DECL_USE_TEMPLATE (newdecl))
1887 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1889 /* Don't really know how much of the language-specific
1890 values we should copy from old to new. */
1891 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1892 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1893 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1894 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1895 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1896 if (DECL_TEMPLATE_INFO (newdecl))
1897 new_template = DECL_TI_TEMPLATE (newdecl);
1898 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1899 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1900 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1901 olddecl_friend = DECL_FRIEND_P (olddecl);
1902 hidden_friend = (DECL_ANTICIPATED (olddecl)
1903 && DECL_HIDDEN_FRIEND_P (olddecl)
1904 && newdecl_is_friend);
1906 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1907 if (TREE_CODE (newdecl) == FUNCTION_DECL
1908 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1910 DECL_BEFRIENDING_CLASSES (newdecl)
1911 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1912 DECL_BEFRIENDING_CLASSES (olddecl));
1913 /* DECL_THUNKS is only valid for virtual functions,
1914 otherwise it is a DECL_FRIEND_CONTEXT. */
1915 if (DECL_VIRTUAL_P (newdecl))
1916 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1920 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1922 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1923 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1925 /* If newdecl is not a specialization, then it is not a
1926 template-related function at all. And that means that we
1927 should have exited above, returning 0. */
1928 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1930 if (TREE_USED (olddecl))
1931 /* From [temp.expl.spec]:
1933 If a template, a member template or the member of a class
1934 template is explicitly specialized then that
1935 specialization shall be declared before the first use of
1936 that specialization that would cause an implicit
1937 instantiation to take place, in every translation unit in
1938 which such a use occurs. */
1939 error ("explicit specialization of %qD after first use",
1942 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1944 /* Don't propagate visibility from the template to the
1945 specialization here. We'll do that in determine_visibility if
1947 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1949 /* [temp.expl.spec/14] We don't inline explicit specialization
1950 just because the primary template says so. */
1952 else if (new_defines_function && DECL_INITIAL (olddecl))
1954 /* C++ is always in in unit-at-a-time mode, so we never
1955 inline re-defined extern inline functions. */
1956 DECL_INLINE (newdecl) = 0;
1957 DECL_UNINLINABLE (newdecl) = 1;
1961 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1962 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1964 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1966 /* If either decl says `inline', this fn is inline, unless
1967 its definition was passed already. */
1968 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1969 DECL_INLINE (olddecl) = 1;
1970 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1972 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1973 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1975 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1976 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1977 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1978 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1981 /* Preserve abstractness on cloned [cd]tors. */
1982 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1986 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1987 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1988 COPY_DECL_RTL (newdecl, olddecl);
1990 if (! types_match || new_defines_function)
1992 /* These need to be copied so that the names are available.
1993 Note that if the types do match, we'll preserve inline
1994 info and other bits, but if not, we won't. */
1995 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1996 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1998 if (new_defines_function)
1999 /* If defining a function declared with other language
2000 linkage, use the previously declared language linkage. */
2001 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
2002 else if (types_match)
2004 /* If redeclaring a builtin function, and not a definition,
2005 it stays built in. */
2006 if (DECL_BUILT_IN (olddecl))
2008 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2009 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2010 /* If we're keeping the built-in definition, keep the rtl,
2011 regardless of declaration matches. */
2012 COPY_DECL_RTL (olddecl, newdecl);
2015 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2016 /* Don't clear out the arguments if we're redefining a function. */
2017 if (DECL_ARGUMENTS (olddecl))
2018 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2021 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2022 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2024 /* Now preserve various other info from the definition. */
2025 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2026 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2027 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2028 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2030 /* Warn about conflicting visibility specifications. */
2031 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2032 && DECL_VISIBILITY_SPECIFIED (newdecl)
2033 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2035 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2036 "because it", newdecl);
2037 warning (OPT_Wattributes, "%Jconflicts with previous "
2038 "declaration here", olddecl);
2040 /* Choose the declaration which specified visibility. */
2041 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2043 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2044 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2046 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2047 so keep this behavior. */
2048 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2050 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2051 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2054 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2055 with that from NEWDECL below. */
2056 if (DECL_LANG_SPECIFIC (olddecl))
2058 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2059 != DECL_LANG_SPECIFIC (newdecl));
2060 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2063 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2067 function_size = sizeof (struct tree_decl_common);
2069 memcpy ((char *) olddecl + sizeof (struct tree_common),
2070 (char *) newdecl + sizeof (struct tree_common),
2071 function_size - sizeof (struct tree_common));
2073 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2074 (char *) newdecl + sizeof (struct tree_decl_common),
2075 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2077 /* If newdecl is a template instantiation, it is possible that
2078 the following sequence of events has occurred:
2080 o A friend function was declared in a class template. The
2081 class template was instantiated.
2083 o The instantiation of the friend declaration was
2084 recorded on the instantiation list, and is newdecl.
2086 o Later, however, instantiate_class_template called pushdecl
2087 on the newdecl to perform name injection. But, pushdecl in
2088 turn called duplicate_decls when it discovered that another
2089 declaration of a global function with the same name already
2092 o Here, in duplicate_decls, we decided to clobber newdecl.
2094 If we're going to do that, we'd better make sure that
2095 olddecl, and not newdecl, is on the list of
2096 instantiations so that if we try to do the instantiation
2097 again we won't get the clobbered declaration. */
2098 reregister_specialization (newdecl,
2104 size_t size = tree_code_size (TREE_CODE (olddecl));
2105 memcpy ((char *) olddecl + sizeof (struct tree_common),
2106 (char *) newdecl + sizeof (struct tree_common),
2107 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2108 switch (TREE_CODE (olddecl))
2118 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2119 (char *) newdecl + sizeof (struct tree_decl_common),
2120 size - sizeof (struct tree_decl_common)
2121 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2125 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2126 (char *) newdecl + sizeof (struct tree_decl_common),
2127 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2128 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2132 DECL_UID (olddecl) = olddecl_uid;
2134 DECL_FRIEND_P (olddecl) = 1;
2137 DECL_ANTICIPATED (olddecl) = 1;
2138 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2141 /* NEWDECL contains the merged attribute lists.
2142 Update OLDDECL to be the same. */
2143 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2145 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2146 so that encode_section_info has a chance to look at the new decl
2147 flags and attributes. */
2148 if (DECL_RTL_SET_P (olddecl)
2149 && (TREE_CODE (olddecl) == FUNCTION_DECL
2150 || (TREE_CODE (olddecl) == VAR_DECL
2151 && TREE_STATIC (olddecl))))
2152 make_decl_rtl (olddecl);
2154 /* The NEWDECL will no longer be needed. Because every out-of-class
2155 declaration of a member results in a call to duplicate_decls,
2156 freeing these nodes represents in a significant savings. */
2157 remove_decl_from_map (newdecl);
2163 /* Return zero if the declaration NEWDECL is valid
2164 when the declaration OLDDECL (assumed to be for the same name)
2165 has already been seen.
2166 Otherwise return an error message format string with a %s
2167 where the identifier should go. */
2170 redeclaration_error_message (tree newdecl, tree olddecl)
2172 if (TREE_CODE (newdecl) == TYPE_DECL)
2174 /* Because C++ can put things into name space for free,
2175 constructs like "typedef struct foo { ... } foo"
2176 would look like an erroneous redeclaration. */
2177 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2180 return "redefinition of %q#D";
2182 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2184 /* If this is a pure function, its olddecl will actually be
2185 the original initialization to `0' (which we force to call
2186 abort()). Don't complain about redefinition in this case. */
2187 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2188 && DECL_INITIAL (olddecl) == NULL_TREE)
2191 /* If both functions come from different namespaces, this is not
2192 a redeclaration - this is a conflict with a used function. */
2193 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2194 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2195 && ! decls_match (olddecl, newdecl))
2196 return "%qD conflicts with used function";
2198 /* We'll complain about linkage mismatches in
2199 warn_extern_redeclared_static. */
2201 /* Defining the same name twice is no good. */
2202 if (DECL_INITIAL (olddecl) != NULL_TREE
2203 && DECL_INITIAL (newdecl) != NULL_TREE)
2205 if (DECL_NAME (olddecl) == NULL_TREE)
2206 return "%q#D not declared in class";
2207 else if (!GNU_INLINE_P (olddecl)
2208 || GNU_INLINE_P (newdecl))
2209 return "redefinition of %q#D";
2212 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2214 bool olda = GNU_INLINE_P (olddecl);
2215 bool newa = GNU_INLINE_P (newdecl);
2220 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2222 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2228 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2232 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2234 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2235 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2236 return "redefinition of %q#D";
2240 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2241 || (DECL_TEMPLATE_RESULT (newdecl)
2242 == DECL_TEMPLATE_RESULT (olddecl)))
2245 nt = DECL_TEMPLATE_RESULT (newdecl);
2246 if (DECL_TEMPLATE_INFO (nt))
2247 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2248 ot = DECL_TEMPLATE_RESULT (olddecl);
2249 if (DECL_TEMPLATE_INFO (ot))
2250 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2251 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2252 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2253 return "redefinition of %q#D";
2255 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2257 bool olda = GNU_INLINE_P (ot);
2258 bool newa = GNU_INLINE_P (nt);
2263 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2265 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2269 /* Core issue #226 (C++0x):
2271 If a friend function template declaration specifies a
2272 default template-argument, that declaration shall be a
2273 definition and shall be the only declaration of the
2274 function template in the translation unit. */
2275 if ((cxx_dialect != cxx98)
2276 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2277 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2278 /*is_primary=*/1, /*is_partial=*/0,
2279 /*is_friend_decl=*/2))
2280 return "redeclaration of friend %q#D may not have default template arguments";
2284 else if (TREE_CODE (newdecl) == VAR_DECL
2285 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2286 && (! DECL_LANG_SPECIFIC (olddecl)
2287 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2288 || DECL_THREAD_LOCAL_P (newdecl)))
2290 /* Only variables can be thread-local, and all declarations must
2291 agree on this property. */
2292 if (DECL_THREAD_LOCAL_P (newdecl))
2293 return "thread-local declaration of %q#D follows "
2294 "non-thread-local declaration";
2296 return "non-thread-local declaration of %q#D follows "
2297 "thread-local declaration";
2299 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2301 /* The objects have been declared at namespace scope. If either
2302 is a member of an anonymous union, then this is an invalid
2303 redeclaration. For example:
2309 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2310 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2311 return "redeclaration of %q#D";
2312 /* If at least one declaration is a reference, there is no
2313 conflict. For example:
2319 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2321 /* Reject two definitions. */
2322 return "redefinition of %q#D";
2326 /* Objects declared with block scope: */
2327 /* Reject two definitions, and reject a definition
2328 together with an external reference. */
2329 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2330 return "redeclaration of %q#D";
2335 /* Hash and equality functions for the named_label table. */
2338 named_label_entry_hash (const void *data)
2340 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2341 return DECL_UID (ent->label_decl);
2345 named_label_entry_eq (const void *a, const void *b)
2347 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2348 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2349 return ent_a->label_decl == ent_b->label_decl;
2352 /* Create a new label, named ID. */
2355 make_label_decl (tree id, int local_p)
2357 struct named_label_entry *ent;
2361 decl = build_decl (LABEL_DECL, id, void_type_node);
2363 DECL_CONTEXT (decl) = current_function_decl;
2364 DECL_MODE (decl) = VOIDmode;
2365 C_DECLARED_LABEL_FLAG (decl) = local_p;
2367 /* Say where one reference is to the label, for the sake of the
2368 error if it is not defined. */
2369 DECL_SOURCE_LOCATION (decl) = input_location;
2371 /* Record the fact that this identifier is bound to this label. */
2372 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2374 /* Create the label htab for the function on demand. */
2376 named_labels = htab_create_ggc (13, named_label_entry_hash,
2377 named_label_entry_eq, NULL);
2379 /* Record this label on the list of labels used in this function.
2380 We do this before calling make_label_decl so that we get the
2381 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2382 ent = GGC_CNEW (struct named_label_entry);
2383 ent->label_decl = decl;
2385 slot = htab_find_slot (named_labels, ent, INSERT);
2386 gcc_assert (*slot == NULL);
2392 /* Look for a label named ID in the current function. If one cannot
2393 be found, create one. (We keep track of used, but undefined,
2394 labels, and complain about them at the end of a function.) */
2397 lookup_label (tree id)
2401 timevar_push (TV_NAME_LOOKUP);
2402 /* You can't use labels at global scope. */
2403 if (current_function_decl == NULL_TREE)
2405 error ("label %qE referenced outside of any function", id);
2406 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2409 /* See if we've already got this label. */
2410 decl = IDENTIFIER_LABEL_VALUE (id);
2411 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2412 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2414 decl = make_label_decl (id, /*local_p=*/0);
2415 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2418 /* Declare a local label named ID. */
2421 declare_local_label (tree id)
2425 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2426 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2427 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2428 current_binding_level->shadowed_labels);
2429 current_binding_level->shadowed_labels = shadow;
2431 decl = make_label_decl (id, /*local_p=*/1);
2432 TREE_VALUE (shadow) = decl;
2437 /* Returns nonzero if it is ill-formed to jump past the declaration of
2438 DECL. Returns 2 if it's also a real problem. */
2441 decl_jump_unsafe (tree decl)
2443 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2444 || TREE_TYPE (decl) == error_mark_node)
2447 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2448 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2451 if (pod_type_p (TREE_TYPE (decl)))
2454 /* The POD stuff is just pedantry; why should it matter if the class
2455 contains a field of pointer to member type? */
2459 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2462 identify_goto (tree decl, const location_t *locus)
2465 pedwarn ("jump to label %qD", decl);
2467 pedwarn ("jump to case label");
2469 pedwarn ("%H from here", locus);
2472 /* Check that a single previously seen jump to a newly defined label
2473 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2474 the jump context; NAMES are the names in scope in LEVEL at the jump
2475 context; LOCUS is the source position of the jump or 0. Returns
2476 true if all is well. */
2479 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2480 bool exited_omp, const location_t *locus)
2482 struct cp_binding_level *b;
2483 bool identified = false, saw_eh = false, saw_omp = false;
2487 identify_goto (decl, locus);
2488 error (" exits OpenMP structured block");
2489 identified = saw_omp = true;
2492 for (b = current_binding_level; b ; b = b->level_chain)
2494 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2496 for (new_decls = b->names; new_decls != old_decls;
2497 new_decls = TREE_CHAIN (new_decls))
2499 int problem = decl_jump_unsafe (new_decls);
2505 identify_goto (decl, locus);
2509 error (" crosses initialization of %q+#D", new_decls);
2511 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2516 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2520 identify_goto (decl, locus);
2523 if (b->kind == sk_try)
2524 error (" enters try block");
2526 error (" enters catch block");
2529 if (b->kind == sk_omp && !saw_omp)
2533 identify_goto (decl, locus);
2536 error (" enters OpenMP structured block");
2545 check_previous_goto (tree decl, struct named_label_use_entry *use)
2547 check_previous_goto_1 (decl, use->binding_level,
2548 use->names_in_scope, use->in_omp_scope,
2549 &use->o_goto_locus);
2553 check_switch_goto (struct cp_binding_level* level)
2555 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2558 /* Check that a new jump to a label DECL is OK. Called by
2559 finish_goto_stmt. */
2562 check_goto (tree decl)
2564 struct named_label_entry *ent, dummy;
2565 bool saw_catch = false, identified = false;
2568 /* We can't know where a computed goto is jumping.
2569 So we assume that it's OK. */
2570 if (TREE_CODE (decl) != LABEL_DECL)
2573 /* We didn't record any information about this label when we created it,
2574 and there's not much point since it's trivial to analyze as a return. */
2575 if (decl == cdtor_label)
2578 dummy.label_decl = decl;
2579 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2580 gcc_assert (ent != NULL);
2582 /* If the label hasn't been defined yet, defer checking. */
2583 if (! DECL_INITIAL (decl))
2585 struct named_label_use_entry *new_use;
2587 /* Don't bother creating another use if the last goto had the
2588 same data, and will therefore create the same set of errors. */
2590 && ent->uses->names_in_scope == current_binding_level->names)
2593 new_use = GGC_NEW (struct named_label_use_entry);
2594 new_use->binding_level = current_binding_level;
2595 new_use->names_in_scope = current_binding_level->names;
2596 new_use->o_goto_locus = input_location;
2597 new_use->in_omp_scope = false;
2599 new_use->next = ent->uses;
2600 ent->uses = new_use;
2604 if (ent->in_try_scope || ent->in_catch_scope
2605 || ent->in_omp_scope || ent->bad_decls)
2607 pedwarn ("jump to label %q+D", decl);
2608 pedwarn (" from here");
2612 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2614 tree b = TREE_VALUE (bad);
2615 int u = decl_jump_unsafe (b);
2617 if (u > 1 && DECL_ARTIFICIAL (b))
2619 /* Can't skip init of __exception_info. */
2620 error ("%J enters catch block", b);
2624 error (" skips initialization of %q+#D", b);
2626 pedwarn (" enters scope of non-POD %q+#D", b);
2629 if (ent->in_try_scope)
2630 error (" enters try block");
2631 else if (ent->in_catch_scope && !saw_catch)
2632 error (" enters catch block");
2634 if (ent->in_omp_scope)
2635 error (" enters OpenMP structured block");
2636 else if (flag_openmp)
2638 struct cp_binding_level *b;
2639 for (b = current_binding_level; b ; b = b->level_chain)
2641 if (b == ent->binding_level)
2643 if (b->kind == sk_omp)
2647 pedwarn ("jump to label %q+D", decl);
2648 pedwarn (" from here");
2651 error (" exits OpenMP structured block");
2658 /* Check that a return is ok wrt OpenMP structured blocks.
2659 Called by finish_return_stmt. Returns true if all is well. */
2662 check_omp_return (void)
2664 struct cp_binding_level *b;
2665 for (b = current_binding_level; b ; b = b->level_chain)
2666 if (b->kind == sk_omp)
2668 error ("invalid exit from OpenMP structured block");
2674 /* Define a label, specifying the location in the source file.
2675 Return the LABEL_DECL node for the label. */
2678 define_label (location_t location, tree name)
2680 struct named_label_entry *ent, dummy;
2681 struct cp_binding_level *p;
2684 timevar_push (TV_NAME_LOOKUP);
2686 decl = lookup_label (name);
2688 dummy.label_decl = decl;
2689 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2690 gcc_assert (ent != NULL);
2692 /* After labels, make any new cleanups in the function go into their
2693 own new (temporary) binding contour. */
2694 for (p = current_binding_level;
2695 p->kind != sk_function_parms;
2697 p->more_cleanups_ok = 0;
2699 if (name == get_identifier ("wchar_t"))
2700 pedwarn ("label named wchar_t");
2702 if (DECL_INITIAL (decl) != NULL_TREE)
2704 error ("duplicate label %qD", decl);
2705 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2709 struct named_label_use_entry *use;
2711 /* Mark label as having been defined. */
2712 DECL_INITIAL (decl) = error_mark_node;
2713 /* Say where in the source. */
2714 DECL_SOURCE_LOCATION (decl) = location;
2716 ent->binding_level = current_binding_level;
2717 ent->names_in_scope = current_binding_level->names;
2719 for (use = ent->uses; use ; use = use->next)
2720 check_previous_goto (decl, use);
2724 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2729 struct cp_binding_level *level;
2730 struct cp_switch *next;
2731 /* The SWITCH_STMT being built. */
2733 /* A splay-tree mapping the low element of a case range to the high
2734 element, or NULL_TREE if there is no high element. Used to
2735 determine whether or not a new case label duplicates an old case
2736 label. We need a tree, rather than simply a hash table, because
2737 of the GNU case range extension. */
2741 /* A stack of the currently active switch statements. The innermost
2742 switch statement is on the top of the stack. There is no need to
2743 mark the stack for garbage collection because it is only active
2744 during the processing of the body of a function, and we never
2745 collect at that point. */
2747 static struct cp_switch *switch_stack;
2749 /* Called right after a switch-statement condition is parsed.
2750 SWITCH_STMT is the switch statement being parsed. */
2753 push_switch (tree switch_stmt)
2755 struct cp_switch *p = XNEW (struct cp_switch);
2756 p->level = current_binding_level;
2757 p->next = switch_stack;
2758 p->switch_stmt = switch_stmt;
2759 p->cases = splay_tree_new (case_compare, NULL, NULL);
2766 struct cp_switch *cs = switch_stack;
2767 location_t switch_location;
2769 /* Emit warnings as needed. */
2770 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2771 switch_location = EXPR_LOCATION (cs->switch_stmt);
2773 switch_location = input_location;
2774 if (!processing_template_decl)
2775 c_do_switch_warnings (cs->cases, switch_location,
2776 SWITCH_STMT_TYPE (cs->switch_stmt),
2777 SWITCH_STMT_COND (cs->switch_stmt));
2779 splay_tree_delete (cs->cases);
2780 switch_stack = switch_stack->next;
2784 /* Note that we've seen a definition of a case label, and complain if this
2785 is a bad place for one. */
2788 finish_case_label (tree low_value, tree high_value)
2791 struct cp_binding_level *p;
2793 if (processing_template_decl)
2797 /* For templates, just add the case label; we'll do semantic
2798 analysis at instantiation-time. */
2799 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2800 return add_stmt (build_case_label (low_value, high_value, label));
2803 /* Find the condition on which this switch statement depends. */
2804 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2805 if (cond && TREE_CODE (cond) == TREE_LIST)
2806 cond = TREE_VALUE (cond);
2808 if (!check_switch_goto (switch_stack->level))
2809 return error_mark_node;
2811 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2812 low_value, high_value);
2814 /* After labels, make any new cleanups in the function go into their
2815 own new (temporary) binding contour. */
2816 for (p = current_binding_level;
2817 p->kind != sk_function_parms;
2819 p->more_cleanups_ok = 0;
2824 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2827 typename_hash (const void* k)
2830 const_tree const t = (const_tree) k;
2832 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2833 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2838 typedef struct typename_info {
2846 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2847 really of type `typename_info*' */
2850 typename_compare (const void * k1, const void * k2)
2852 const_tree const t1 = (const_tree) k1;
2853 const typename_info *const t2 = (const typename_info *) k2;
2855 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2856 && TYPE_CONTEXT (t1) == t2->scope
2857 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2858 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2859 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2862 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2863 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2865 Returns the new TYPENAME_TYPE. */
2867 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2870 build_typename_type (tree context, tree name, tree fullname,
2871 enum tag_types tag_type)
2879 if (typename_htab == NULL)
2880 typename_htab = htab_create_ggc (61, &typename_hash,
2881 &typename_compare, NULL);
2883 ti.scope = FROB_CONTEXT (context);
2885 ti.template_id = fullname;
2886 ti.enum_p = tag_type == enum_type;
2887 ti.class_p = (tag_type == class_type
2888 || tag_type == record_type
2889 || tag_type == union_type);
2890 hash = (htab_hash_pointer (ti.scope)
2891 ^ htab_hash_pointer (ti.name));
2893 /* See if we already have this type. */
2894 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2899 /* Build the TYPENAME_TYPE. */
2900 t = make_aggr_type (TYPENAME_TYPE);
2901 TYPE_CONTEXT (t) = ti.scope;
2902 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2903 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2904 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2906 /* Build the corresponding TYPE_DECL. */
2907 d = build_decl (TYPE_DECL, name, t);
2908 TYPE_NAME (TREE_TYPE (d)) = d;
2909 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2910 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2911 DECL_ARTIFICIAL (d) = 1;
2913 /* Store it in the hash table. */
2916 /* TYPENAME_TYPEs must always be compared structurally, because
2917 they may or may not resolve down to another type depending on
2918 the currently open classes. */
2919 SET_TYPE_STRUCTURAL_EQUALITY (t);
2925 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2926 provided to name the type. Returns an appropriate type, unless an
2927 error occurs, in which case error_mark_node is returned. If we
2928 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2929 return that, rather than the _TYPE it corresponds to, in other
2930 cases we look through the type decl. If TF_ERROR is set, complain
2931 about errors, otherwise be quiet. */
2934 make_typename_type (tree context, tree name, enum tag_types tag_type,
2935 tsubst_flags_t complain)
2941 if (name == error_mark_node
2942 || context == NULL_TREE
2943 || context == error_mark_node)
2944 return error_mark_node;
2948 if (!(TYPE_LANG_SPECIFIC (name)
2949 && (CLASSTYPE_IS_TEMPLATE (name)
2950 || CLASSTYPE_USE_TEMPLATE (name))))
2951 name = TYPE_IDENTIFIER (name);
2953 /* Create a TEMPLATE_ID_EXPR for the type. */
2954 name = build_nt (TEMPLATE_ID_EXPR,
2955 CLASSTYPE_TI_TEMPLATE (name),
2956 CLASSTYPE_TI_ARGS (name));
2958 else if (TREE_CODE (name) == TYPE_DECL)
2959 name = DECL_NAME (name);
2963 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2965 name = TREE_OPERAND (name, 0);
2966 if (TREE_CODE (name) == TEMPLATE_DECL)
2967 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2968 else if (TREE_CODE (name) == OVERLOAD)
2970 error ("%qD is not a type", name);
2971 return error_mark_node;
2974 if (TREE_CODE (name) == TEMPLATE_DECL)
2976 error ("%qD used without template parameters", name);
2977 return error_mark_node;
2979 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2980 gcc_assert (TYPE_P (context));
2982 /* When the CONTEXT is a dependent type, NAME could refer to a
2983 dependent base class of CONTEXT. So we cannot peek inside it,
2984 even if CONTEXT is a currently open scope. */
2985 if (dependent_type_p (context))
2986 return build_typename_type (context, name, fullname, tag_type);
2988 if (!IS_AGGR_TYPE (context))
2990 if (complain & tf_error)
2991 error ("%q#T is not a class", context);
2992 return error_mark_node;
2995 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2997 /* We should only set WANT_TYPE when we're a nested typename type.
2998 Then we can give better diagnostics if we find a non-type. */
2999 t = lookup_field (context, name, 0, /*want_type=*/true);
3002 if (complain & tf_error)
3003 error (want_template ? "no class template named %q#T in %q#T"
3004 : "no type named %q#T in %q#T", name, context);
3005 return error_mark_node;
3008 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3010 if (complain & tf_error)
3011 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3013 return error_mark_node;
3015 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3017 if (complain & tf_error)
3018 error ("%<typename %T::%D%> names %q#T, which is not a type",
3020 return error_mark_node;
3023 if (complain & tf_error)
3024 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3027 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3029 /*entering_scope=*/0,
3030 tf_warning_or_error | tf_user);
3032 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3038 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3039 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3040 in which case error_mark_node is returned.
3042 If PARM_LIST is non-NULL, also make sure that the template parameter
3043 list of TEMPLATE_DECL matches.
3045 If COMPLAIN zero, don't complain about any errors that occur. */
3048 make_unbound_class_template (tree context, tree name, tree parm_list,
3049 tsubst_flags_t complain)
3055 name = TYPE_IDENTIFIER (name);
3056 else if (DECL_P (name))
3057 name = DECL_NAME (name);
3058 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3060 if (!dependent_type_p (context)
3061 || currently_open_class (context))
3063 tree tmpl = NULL_TREE;
3065 if (IS_AGGR_TYPE (context))
3066 tmpl = lookup_field (context, name, 0, false);
3068 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3070 if (complain & tf_error)
3071 error ("no class template named %q#T in %q#T", name, context);
3072 return error_mark_node;
3076 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3078 if (complain & tf_error)
3080 error ("template parameters do not match template");
3081 error ("%q+D declared here", tmpl);
3083 return error_mark_node;
3086 if (complain & tf_error)
3087 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3092 /* Build the UNBOUND_CLASS_TEMPLATE. */
3093 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
3094 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3095 TREE_TYPE (t) = NULL_TREE;
3096 SET_TYPE_STRUCTURAL_EQUALITY (t);
3098 /* Build the corresponding TEMPLATE_DECL. */
3099 d = build_decl (TEMPLATE_DECL, name, t);
3100 TYPE_NAME (TREE_TYPE (d)) = d;
3101 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3102 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3103 DECL_ARTIFICIAL (d) = 1;
3104 DECL_TEMPLATE_PARMS (d) = parm_list;
3111 /* Push the declarations of builtin types into the namespace.
3112 RID_INDEX is the index of the builtin type in the array
3113 RID_POINTERS. NAME is the name used when looking up the builtin
3114 type. TYPE is the _TYPE node for the builtin type. */
3117 record_builtin_type (enum rid rid_index,
3121 tree rname = NULL_TREE, tname = NULL_TREE;
3122 tree tdecl = NULL_TREE;
3124 if ((int) rid_index < (int) RID_MAX)
3125 rname = ridpointers[(int) rid_index];
3127 tname = get_identifier (name);
3129 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3130 eliminated. Built-in types should not be looked up name; their
3131 names are keywords that the parser can recognize. However, there
3132 is code in c-common.c that uses identifier_global_value to look
3133 up built-in types by name. */
3136 tdecl = build_decl (TYPE_DECL, tname, type);
3137 DECL_ARTIFICIAL (tdecl) = 1;
3138 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3144 tdecl = build_decl (TYPE_DECL, rname, type);
3145 DECL_ARTIFICIAL (tdecl) = 1;
3147 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3150 if (!TYPE_NAME (type))
3151 TYPE_NAME (type) = tdecl;
3154 debug_hooks->type_decl (tdecl, 0);
3157 /* Record one of the standard Java types.
3158 * Declare it as having the given NAME.
3159 * If SIZE > 0, it is the size of one of the integral types;
3160 * otherwise it is the negative of the size of one of the other types. */
3163 record_builtin_java_type (const char* name, int size)
3167 type = make_signed_type (size);
3168 else if (size == -1)
3169 { /* "__java_boolean". */
3170 if ((TYPE_MODE (boolean_type_node)
3171 == smallest_mode_for_size (1, MODE_INT)))
3172 type = build_variant_type_copy (boolean_type_node);
3174 /* ppc-darwin has SImode bool, make jboolean a 1-bit
3175 integer type without boolean semantics there. */
3176 type = make_unsigned_type (1);
3178 else if (size > -32)
3179 { /* "__java_char". */
3180 type = make_unsigned_type (-size);
3183 { /* "__java_float" or ""__java_double". */
3184 type = make_node (REAL_TYPE);
3185 TYPE_PRECISION (type) = - size;
3188 record_builtin_type (RID_MAX, name, type);
3189 decl = TYPE_NAME (type);
3191 /* Suppress generate debug symbol entries for these types,
3192 since for normal C++ they are just clutter.
3193 However, push_lang_context undoes this if extern "Java" is seen. */
3194 DECL_IGNORED_P (decl) = 1;
3196 TYPE_FOR_JAVA (type) = 1;
3200 /* Push a type into the namespace so that the back ends ignore it. */
3203 record_unknown_type (tree type, const char* name)
3205 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3206 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3207 DECL_IGNORED_P (decl) = 1;
3208 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3209 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3210 TYPE_ALIGN (type) = 1;
3211 TYPE_USER_ALIGN (type) = 0;
3212 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3215 /* A string for which we should create an IDENTIFIER_NODE at
3218 typedef struct predefined_identifier
3220 /* The name of the identifier. */
3221 const char *const name;
3222 /* The place where the IDENTIFIER_NODE should be stored. */
3224 /* Nonzero if this is the name of a constructor or destructor. */
3225 const int ctor_or_dtor_p;
3226 } predefined_identifier;
3228 /* Create all the predefined identifiers. */
3231 initialize_predefined_identifiers (void)
3233 const predefined_identifier *pid;
3235 /* A table of identifiers to create at startup. */
3236 static const predefined_identifier predefined_identifiers[] = {
3237 { "C++", &lang_name_cplusplus, 0 },
3238 { "C", &lang_name_c, 0 },
3239 { "Java", &lang_name_java, 0 },
3240 /* Some of these names have a trailing space so that it is
3241 impossible for them to conflict with names written by users. */
3242 { "__ct ", &ctor_identifier, 1 },
3243 { "__base_ctor ", &base_ctor_identifier, 1 },
3244 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3245 { "__dt ", &dtor_identifier, 1 },
3246 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3247 { "__base_dtor ", &base_dtor_identifier, 1 },
3248 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3249 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3250 { "nelts", &nelts_identifier, 0 },
3251 { THIS_NAME, &this_identifier, 0 },
3252 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3253 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3254 { "_vptr", &vptr_identifier, 0 },
3255 { "__vtt_parm", &vtt_parm_identifier, 0 },
3256 { "::", &global_scope_name, 0 },
3257 { "std", &std_identifier, 0 },
3261 for (pid = predefined_identifiers; pid->name; ++pid)
3263 *pid->node = get_identifier (pid->name);
3264 if (pid->ctor_or_dtor_p)
3265 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3269 /* Create the predefined scalar types of C,
3270 and some nodes representing standard constants (0, 1, (void *)0).
3271 Initialize the global binding level.
3272 Make definitions for built-in primitive functions. */
3275 cxx_init_decl_processing (void)
3278 tree void_ftype_ptr;
3280 build_common_tree_nodes (flag_signed_char, false);
3282 /* Create all the identifiers we need. */
3283 initialize_predefined_identifiers ();
3285 /* Create the global variables. */
3286 push_to_top_level ();
3288 current_function_decl = NULL_TREE;
3289 current_binding_level = NULL;
3290 /* Enter the global namespace. */
3291 gcc_assert (global_namespace == NULL_TREE);
3292 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3294 TREE_PUBLIC (global_namespace) = 1;
3295 begin_scope (sk_namespace, global_namespace);
3297 current_lang_name = NULL_TREE;
3299 if (flag_visibility_ms_compat)
3300 default_visibility = VISIBILITY_HIDDEN;
3303 current_lang_name = lang_name_c;
3305 /* Create the `std' namespace. */
3306 push_namespace (std_identifier);
3307 std_node = current_namespace;
3310 c_common_nodes_and_builtins ();
3312 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3313 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3314 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3315 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3316 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3317 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3318 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3319 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3321 integer_two_node = build_int_cst (NULL_TREE, 2);
3322 integer_three_node = build_int_cst (NULL_TREE, 3);
3324 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3325 truthvalue_type_node = boolean_type_node;
3326 truthvalue_false_node = boolean_false_node;
3327 truthvalue_true_node = boolean_true_node;
3329 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3332 record_builtin_type (RID_MAX, NULL, string_type_node);
3335 delta_type_node = ptrdiff_type_node;
3336 vtable_index_type = ptrdiff_type_node;
3338 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3339 void_ftype = build_function_type (void_type_node, void_list_node);
3340 void_ftype_ptr = build_function_type (void_type_node,
3341 tree_cons (NULL_TREE,
3345 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3347 /* C++ extensions */
3349 unknown_type_node = make_node (UNKNOWN_TYPE);
3350 record_unknown_type (unknown_type_node, "unknown type");
3352 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3353 TREE_TYPE (unknown_type_node) = unknown_type_node;
3355 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3357 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3358 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3361 /* Make sure we get a unique function type, so we can give
3362 its pointer type a name. (This wins for gdb.) */
3363 tree vfunc_type = make_node (FUNCTION_TYPE);
3364 TREE_TYPE (vfunc_type) = integer_type_node;
3365 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3366 layout_type (vfunc_type);
3368 vtable_entry_type = build_pointer_type (vfunc_type);
3370 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3373 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3374 layout_type (vtbl_type_node);
3375 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3376 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3377 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3378 layout_type (vtbl_ptr_type_node);
3379 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3381 push_namespace (get_identifier ("__cxxabiv1"));
3382 abi_node = current_namespace;
3385 global_type_node = make_node (LANG_TYPE);
3386 record_unknown_type (global_type_node, "global type");
3389 current_lang_name = lang_name_cplusplus;
3393 tree bad_alloc_type_node;
3394 tree bad_alloc_decl;
3395 tree newtype, deltype;
3396 tree ptr_ftype_sizetype;
3398 push_namespace (std_identifier);
3399 bad_alloc_id = get_identifier ("bad_alloc");
3400 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3401 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3403 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3404 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3405 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3409 = build_function_type (ptr_type_node,
3410 tree_cons (NULL_TREE,
3413 newtype = build_exception_variant
3414 (ptr_ftype_sizetype, add_exception_specifier
3415 (NULL_TREE, bad_alloc_type_node, -1));
3416 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3417 push_cp_library_fn (NEW_EXPR, newtype);
3418 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3419 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3420 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3424 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3426 /* Perform other language dependent initializations. */
3427 init_class_processing ();
3428 init_rtti_processing ();
3430 if (flag_exceptions)
3431 init_exception_processing ();
3433 if (! supports_one_only ())
3436 make_fname_decl = cp_make_fname_decl;
3437 start_fname_decls ();
3439 /* Show we use EH for cleanups. */
3440 if (flag_exceptions)
3441 using_eh_for_cleanups ();
3444 /* Generate an initializer for a function naming variable from
3445 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3446 filled in with the type of the init. */
3449 cp_fname_init (const char* name, tree *type_p)
3451 tree domain = NULL_TREE;
3453 tree init = NULL_TREE;
3458 length = strlen (name);
3459 domain = build_index_type (size_int (length));
3460 init = build_string (length + 1, name);
3463 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3464 type = build_cplus_array_type (type, domain);
3469 TREE_TYPE (init) = type;
3471 init = error_mark_node;
3476 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3477 decl, NAME is the initialization string and TYPE_DEP indicates whether
3478 NAME depended on the type of the function. We make use of that to detect
3479 __PRETTY_FUNCTION__ inside a template fn. This is being done
3480 lazily at the point of first use, so we mustn't push the decl now. */
3483 cp_make_fname_decl (tree id, int type_dep)
3485 const char *const name = (type_dep && processing_template_decl
3486 ? NULL : fname_as_string (type_dep));
3488 tree init = cp_fname_init (name, &type);
3489 tree decl = build_decl (VAR_DECL, id, type);
3492 free (CONST_CAST (char *, name));
3494 /* As we're using pushdecl_with_scope, we must set the context. */
3495 DECL_CONTEXT (decl) = current_function_decl;
3496 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3498 TREE_STATIC (decl) = 1;
3499 TREE_READONLY (decl) = 1;
3500 DECL_ARTIFICIAL (decl) = 1;
3502 TREE_USED (decl) = 1;
3504 if (current_function_decl)
3506 struct cp_binding_level *b = current_binding_level;
3507 while (b->level_chain->kind != sk_function_parms)
3509 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3510 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3511 LOOKUP_ONLYCONVERTING);
3514 pushdecl_top_level_and_finish (decl, init);
3520 builtin_function_1 (tree decl, tree context)
3522 tree id = DECL_NAME (decl);
3523 const char *name = IDENTIFIER_POINTER (id);
3525 retrofit_lang_decl (decl);
3527 /* All nesting of C++ functions is lexical; there is never a "static
3528 chain" in the sense of GNU C nested functions. */
3529 DECL_NO_STATIC_CHAIN (decl) = 1;
3531 DECL_ARTIFICIAL (decl) = 1;
3532 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3533 SET_DECL_LANGUAGE (decl, lang_c);
3534 /* Runtime library routines are, by definition, available in an
3535 external shared object. */
3536 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3537 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3539 DECL_CONTEXT (decl) = context;
3543 /* A function in the user's namespace should have an explicit
3544 declaration before it is used. Mark the built-in function as
3545 anticipated but not actually declared. */
3546 if (name[0] != '_' || name[1] != '_')
3547 DECL_ANTICIPATED (decl) = 1;
3548 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3550 size_t len = strlen (name);
3552 /* Treat __*_chk fortification functions as anticipated as well,
3553 unless they are __builtin_*. */
3554 if (len > strlen ("___chk")
3555 && memcmp (name + len - strlen ("_chk"),
3556 "_chk", strlen ("_chk") + 1) == 0)
3557 DECL_ANTICIPATED (decl) = 1;
3564 cxx_builtin_function (tree decl)
3566 tree id = DECL_NAME (decl);
3567 const char *name = IDENTIFIER_POINTER (id);
3568 /* All builtins that don't begin with an '_' should additionally
3569 go in the 'std' namespace. */
3572 tree decl2 = copy_node(decl);
3573 push_namespace (std_identifier);
3574 builtin_function_1 (decl2, std_node);
3578 return builtin_function_1 (decl, NULL_TREE);
3581 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3582 function. Not called directly. */
3585 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3587 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3588 DECL_EXTERNAL (fn) = 1;
3589 TREE_PUBLIC (fn) = 1;
3590 DECL_ARTIFICIAL (fn) = 1;
3591 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3592 SET_DECL_LANGUAGE (fn, lang_c);
3593 /* Runtime library routines are, by definition, available in an
3594 external shared object. */
3595 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3596 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3600 /* Returns the _DECL for a library function with C linkage.
3601 We assume that such functions never throw; if this is incorrect,
3602 callers should unset TREE_NOTHROW. */
3605 build_library_fn (tree name, tree type)
3607 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3608 TREE_NOTHROW (fn) = 1;
3612 /* Returns the _DECL for a library function with C++ linkage. */
3615 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3617 tree fn = build_library_fn_1 (name, operator_code, type);
3618 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3619 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3620 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3624 /* Like build_library_fn, but takes a C string instead of an
3628 build_library_fn_ptr (const char* name, tree type)
3630 return build_library_fn (get_identifier (name), type);
3633 /* Like build_cp_library_fn, but takes a C string instead of an
3637 build_cp_library_fn_ptr (const char* name, tree type)
3639 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3642 /* Like build_library_fn, but also pushes the function so that we will
3643 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3646 push_library_fn (tree name, tree type)
3648 tree fn = build_library_fn (name, type);
3649 pushdecl_top_level (fn);
3653 /* Like build_cp_library_fn, but also pushes the function so that it
3654 will be found by normal lookup. */
3657 push_cp_library_fn (enum tree_code operator_code, tree type)
3659 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3666 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3670 push_void_library_fn (tree name, tree parmtypes)
3672 tree type = build_function_type (void_type_node, parmtypes);
3673 return push_library_fn (name, type);
3676 /* Like push_library_fn, but also note that this function throws
3677 and does not return. Used for __throw_foo and the like. */
3680 push_throw_library_fn (tree name, tree type)
3682 tree fn = push_library_fn (name, type);
3683 TREE_THIS_VOLATILE (fn) = 1;
3684 TREE_NOTHROW (fn) = 0;
3688 /* When we call finish_struct for an anonymous union, we create
3689 default copy constructors and such. But, an anonymous union
3690 shouldn't have such things; this function undoes the damage to the
3691 anonymous union type T.
3693 (The reason that we create the synthesized methods is that we don't
3694 distinguish `union { int i; }' from `typedef union { int i; } U'.
3695 The first is an anonymous union; the second is just an ordinary
3699 fixup_anonymous_aggr (tree t)
3703 /* Wipe out memory of synthesized methods. */
3704 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3705 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3706 TYPE_HAS_INIT_REF (t) = 0;
3707 TYPE_HAS_CONST_INIT_REF (t) = 0;
3708 TYPE_HAS_ASSIGN_REF (t) = 0;
3709 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3711 /* Splice the implicitly generated functions out of the TYPE_METHODS
3713 q = &TYPE_METHODS (t);
3716 if (DECL_ARTIFICIAL (*q))
3717 *q = TREE_CHAIN (*q);
3719 q = &TREE_CHAIN (*q);
3722 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3723 if (TYPE_METHODS (t))
3725 tree decl = TYPE_MAIN_DECL (t);
3727 if (TREE_CODE (t) != UNION_TYPE)
3728 error ("%Jan anonymous struct cannot have function members", decl);
3730 error ("%Jan anonymous union cannot have function members", decl);
3733 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3734 assignment operators (because they cannot have these methods themselves).
3735 For anonymous unions this is already checked because they are not allowed
3736 in any union, otherwise we have to check it. */
3737 if (TREE_CODE (t) != UNION_TYPE)
3741 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3742 if (TREE_CODE (field) == FIELD_DECL)
3744 type = TREE_TYPE (field);
3745 if (CLASS_TYPE_P (type))
3747 if (TYPE_NEEDS_CONSTRUCTING (type))
3748 error ("member %q+#D with constructor not allowed "
3749 "in anonymous aggregate", field);
3750 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3751 error ("member %q+#D with destructor not allowed "
3752 "in anonymous aggregate", field);
3753 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3754 error ("member %q+#D with copy assignment operator "
3755 "not allowed in anonymous aggregate", field);
3761 /* Make sure that a declaration with no declarator is well-formed, i.e.
3762 just declares a tagged type or anonymous union.
3764 Returns the type declared; or NULL_TREE if none. */
3767 check_tag_decl (cp_decl_specifier_seq *declspecs)
3769 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3770 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3771 /* If a class, struct, or enum type is declared by the DECLSPECS
3772 (i.e, if a class-specifier, enum-specifier, or non-typename
3773 elaborated-type-specifier appears in the DECLSPECS),
3774 DECLARED_TYPE is set to the corresponding type. */
3775 tree declared_type = NULL_TREE;
3776 bool error_p = false;
3778 if (declspecs->multiple_types_p)
3779 error ("multiple types in one declaration");
3780 else if (declspecs->redefined_builtin_type)
3782 if (!in_system_header)
3783 pedwarn ("redeclaration of C++ built-in type %qT",
3784 declspecs->redefined_builtin_type);
3789 && TYPE_P (declspecs->type)
3790 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3791 && IS_AGGR_TYPE (declspecs->type))
3792 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3793 declared_type = declspecs->type;
3794 else if (declspecs->type == error_mark_node)
3796 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3797 pedwarn ("declaration does not declare anything");
3798 /* Check for an anonymous union. */
3799 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3800 && TYPE_ANONYMOUS_P (declared_type))
3802 /* 7/3 In a simple-declaration, the optional init-declarator-list
3803 can be omitted only when declaring a class (clause 9) or
3804 enumeration (7.2), that is, when the decl-specifier-seq contains
3805 either a class-specifier, an elaborated-type-specifier with
3806 a class-key (9.1), or an enum-specifier. In these cases and
3807 whenever a class-specifier or enum-specifier is present in the
3808 decl-specifier-seq, the identifiers in these specifiers are among
3809 the names being declared by the declaration (as class-name,
3810 enum-names, or enumerators, depending on the syntax). In such
3811 cases, and except for the declaration of an unnamed bit-field (9.6),
3812 the decl-specifier-seq shall introduce one or more names into the
3813 program, or shall redeclare a name introduced by a previous
3814 declaration. [Example:
3815 enum { }; // ill-formed
3816 typedef class { }; // ill-formed
3820 error ("missing type-name in typedef-declaration");
3823 /* Anonymous unions are objects, so they can have specifiers. */;
3824 SET_ANON_AGGR_TYPE_P (declared_type);
3826 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3827 && !in_system_header)
3828 pedwarn ("ISO C++ prohibits anonymous structs");
3833 if (declspecs->specs[(int)ds_inline]
3834 || declspecs->specs[(int)ds_virtual])
3835 error ("%qs can only be specified for functions",
3836 declspecs->specs[(int)ds_inline]
3837 ? "inline" : "virtual");
3839 && (!current_class_type
3840 || current_scope () != current_class_type))
3841 error ("%<friend%> can only be specified inside a class");
3842 else if (declspecs->specs[(int)ds_explicit])
3843 error ("%<explicit%> can only be specified for constructors");
3844 else if (declspecs->storage_class)
3845 error ("a storage class can only be specified for objects "
3847 else if (declspecs->specs[(int)ds_const]
3848 || declspecs->specs[(int)ds_volatile]
3849 || declspecs->specs[(int)ds_restrict]
3850 || declspecs->specs[(int)ds_thread])
3851 error ("qualifiers can only be specified for objects "
3853 else if (saw_typedef)
3854 warning (0, "%<typedef%> was ignored in this declaration");
3857 return declared_type;
3860 /* Called when a declaration is seen that contains no names to declare.
3861 If its type is a reference to a structure, union or enum inherited
3862 from a containing scope, shadow that tag name for the current scope
3863 with a forward reference.
3864 If its type defines a new named structure or union
3865 or defines an enum, it is valid but we need not do anything here.
3866 Otherwise, it is an error.
3868 C++: may have to grok the declspecs to learn about static,
3869 complain for anonymous unions.
3871 Returns the TYPE declared -- or NULL_TREE if none. */
3874 shadow_tag (cp_decl_specifier_seq *declspecs)
3876 tree t = check_tag_decl (declspecs);
3881 if (declspecs->attributes)
3883 warning (0, "attribute ignored in declaration of %q+#T", t);
3884 warning (0, "attribute for %q+#T must follow the %qs keyword",
3885 t, class_key_or_enum_as_string (t));
3889 if (maybe_process_partial_specialization (t) == error_mark_node)
3892 /* This is where the variables in an anonymous union are
3893 declared. An anonymous union declaration looks like:
3895 because there is no declarator after the union, the parser
3896 sends that declaration here. */
3897 if (ANON_AGGR_TYPE_P (t))
3899 fixup_anonymous_aggr (t);
3901 if (TYPE_FIELDS (t))
3903 tree decl = grokdeclarator (/*declarator=*/NULL,
3904 declspecs, NORMAL, 0, NULL);
3905 finish_anon_union (decl);
3912 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3915 groktypename (cp_decl_specifier_seq *type_specifiers,
3916 const cp_declarator *declarator)
3920 attrs = type_specifiers->attributes;
3921 type_specifiers->attributes = NULL_TREE;
3922 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3923 if (attrs && type != error_mark_node)
3925 if (CLASS_TYPE_P (type))
3926 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3927 "outside of definition", type);
3928 else if (IS_AGGR_TYPE (type))
3929 /* A template type parameter or other dependent type. */
3930 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3931 "type %qT without an associated declaration", type);
3933 cplus_decl_attributes (&type, attrs, 0);
3938 /* Process a DECLARATOR for a function-scope variable declaration,
3939 namespace-scope variable declaration, or function declaration.
3940 (Function definitions go through start_function; class member
3941 declarations appearing in the body of the class go through
3942 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3943 If an error occurs, the error_mark_node is returned instead.
3945 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED
3946 is true if an explicit initializer is present, but false if this is
3947 a variable implicitly initialized via a default constructor.
3948 ATTRIBUTES and PREFIX_ATTRIBUTES are GNU attributes associated with
3949 this declaration. *PUSHED_SCOPE_P is set to the scope entered in
3950 this function, if any; if set, the caller is responsible for
3951 calling pop_scope. */
3954 start_decl (const cp_declarator *declarator,
3955 cp_decl_specifier_seq *declspecs,
3958 tree prefix_attributes,
3959 tree *pushed_scope_p)
3966 *pushed_scope_p = NULL_TREE;
3968 /* An object declared as __attribute__((deprecated)) suppresses
3969 warnings of uses of other deprecated items. */
3970 if (lookup_attribute ("deprecated", attributes))
3971 deprecated_state = DEPRECATED_SUPPRESS;
3973 attributes = chainon (attributes, prefix_attributes);
3975 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3978 deprecated_state = DEPRECATED_NORMAL;
3980 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3981 || decl == error_mark_node)
3982 return error_mark_node;
3984 type = TREE_TYPE (decl);
3986 context = DECL_CONTEXT (decl);
3990 *pushed_scope_p = push_scope (context);
3992 /* We are only interested in class contexts, later. */
3993 if (TREE_CODE (context) == NAMESPACE_DECL)
3994 context = NULL_TREE;
3998 /* Is it valid for this decl to have an initializer at all?
3999 If not, set INITIALIZED to zero, which will indirectly
4000 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4001 switch (TREE_CODE (decl))
4004 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4005 return error_mark_node;
4008 error ("function %q#D is initialized like a variable", decl);
4009 return error_mark_node;
4017 if (! toplevel_bindings_p ()
4018 && DECL_EXTERNAL (decl))
4019 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4021 DECL_EXTERNAL (decl) = 0;
4022 if (toplevel_bindings_p ())
4023 TREE_STATIC (decl) = 1;
4026 /* Set attributes here so if duplicate decl, will have proper attributes. */
4027 cplus_decl_attributes (&decl, attributes, 0);
4029 /* Dllimported symbols cannot be defined. Static data members (which
4030 can be initialized in-class and dllimported) go through grokfield,
4031 not here, so we don't need to exclude those decls when checking for
4033 if (initialized && DECL_DLLIMPORT_P (decl))
4035 error ("definition of %q#D is marked %<dllimport%>", decl);
4036 DECL_DLLIMPORT_P (decl) = 0;
4039 /* If #pragma weak was used, mark the decl weak now. */
4040 maybe_apply_pragma_weak (decl);
4042 if (TREE_CODE (decl) == FUNCTION_DECL
4043 && DECL_DECLARED_INLINE_P (decl)
4044 && DECL_UNINLINABLE (decl)
4045 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4046 warning (0, "inline function %q+D given attribute noinline", decl);
4048 if (context && COMPLETE_TYPE_P (complete_type (context)))
4050 if (TREE_CODE (decl) == VAR_DECL)
4052 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4053 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4054 error ("%q#D is not a static member of %q#T", decl, context);
4057 if (DECL_CONTEXT (field) != context)
4059 if (!same_type_p (DECL_CONTEXT (field), context))
4060 pedwarn ("ISO C++ does not permit %<%T::%D%> "
4061 "to be defined as %<%T::%D%>",
4062 DECL_CONTEXT (field), DECL_NAME (decl),
4063 context, DECL_NAME (decl));
4064 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4066 if (processing_specialization
4067 && template_class_depth (context) == 0
4068 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4069 error ("template header not allowed in member definition "
4070 "of explicitly specialized class");
4071 /* Static data member are tricky; an in-class initialization
4072 still doesn't provide a definition, so the in-class
4073 declaration will have DECL_EXTERNAL set, but will have an
4074 initialization. Thus, duplicate_decls won't warn
4075 about this situation, and so we check here. */
4076 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4077 error ("duplicate initialization of %qD", decl);
4078 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4084 tree field = check_classfn (context, decl,
4085 (processing_template_decl
4086 > template_class_depth (context))
4087 ? current_template_parms
4089 if (field && field != error_mark_node
4090 && duplicate_decls (decl, field,
4091 /*newdecl_is_friend=*/false))
4095 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4096 DECL_IN_AGGR_P (decl) = 0;
4097 /* Do not mark DECL as an explicit specialization if it was not
4098 already marked as an instantiation; a declaration should
4099 never be marked as a specialization unless we know what
4100 template is being specialized. */
4101 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4103 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4105 /* [temp.expl.spec] An explicit specialization of a static data
4106 member of a template is a definition if the declaration
4107 includes an initializer; otherwise, it is a declaration.
4109 We check for processing_specialization so this only applies
4110 to the new specialization syntax. */
4111 if (!initialized && processing_specialization)
4112 DECL_EXTERNAL (decl) = 1;
4115 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4116 pedwarn ("declaration of %q#D outside of class is not definition",
4120 was_public = TREE_PUBLIC (decl);
4122 /* Enter this declaration into the symbol table. */
4123 decl = maybe_push_decl (decl);
4125 if (processing_template_decl)
4126 decl = push_template_decl (decl);
4127 if (decl == error_mark_node)
4128 return error_mark_node;
4130 /* Tell the back end to use or not use .common as appropriate. If we say
4131 -fconserve-space, we want this to save .data space, at the expense of
4132 wrong semantics. If we say -fno-conserve-space, we want this to
4133 produce errors about redefs; to do this we force variables into the
4135 if (flag_conserve_space
4136 && TREE_CODE (decl) == VAR_DECL
4137 && TREE_PUBLIC (decl)
4138 && !DECL_THREAD_LOCAL_P (decl)
4139 && !have_global_bss_p ())
4140 DECL_COMMON (decl) = 1;
4142 if (TREE_CODE (decl) == VAR_DECL
4143 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4144 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4146 /* This is a const variable with implicit 'static'. Set
4147 DECL_THIS_STATIC so we can tell it from variables that are
4148 !TREE_PUBLIC because of the anonymous namespace. */
4149 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4150 DECL_THIS_STATIC (decl) = 1;
4153 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4154 start_decl_1 (decl, initialized);
4159 /* Process the declaration of a variable DECL. INITIALIZED is true
4160 iff DECL is explicitly initialized. (INITIALIZED is false if the
4161 variable is initialized via an implicitly-called constructor.)
4162 This function must be called for ordinary variables (including, for
4163 example, implicit instantiations of templates), but must not be
4164 called for template declarations. */
4167 start_decl_1 (tree decl, bool initialized)
4171 bool aggregate_definition_p;
4173 gcc_assert (!processing_template_decl);
4175 if (error_operand_p (decl))
4178 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4180 type = TREE_TYPE (decl);
4181 complete_p = COMPLETE_TYPE_P (type);
4182 aggregate_definition_p = IS_AGGR_TYPE (type) && !DECL_EXTERNAL (decl);
4184 /* If an explicit initializer is present, or if this is a definition
4185 of an aggregate, then we need a complete type at this point.
4186 (Scalars are always complete types, so there is nothing to
4187 check.) This code just sets COMPLETE_P; errors (if necessary)
4188 are issued below. */
4189 if ((initialized || aggregate_definition_p)
4191 && COMPLETE_TYPE_P (complete_type (type)))
4194 /* We will not yet have set TREE_READONLY on DECL if the type
4195 was "const", but incomplete, before this point. But, now, we
4196 have a complete type, so we can try again. */
4197 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4201 /* Is it valid for this decl to have an initializer at all? */
4203 /* Don't allow initializations for incomplete types except for
4204 arrays which might be completed by the initialization. */
4206 ; /* A complete type is ok. */
4207 else if (TREE_CODE (type) != ARRAY_TYPE)
4209 error ("variable %q#D has initializer but incomplete type", decl);
4210 type = TREE_TYPE (decl) = error_mark_node;
4212 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4214 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4215 error ("elements of array %q#D have incomplete type", decl);
4216 /* else we already gave an error in start_decl. */
4219 else if (aggregate_definition_p && !complete_p)
4221 error ("aggregate %q#D has incomplete type and cannot be defined",
4223 /* Change the type so that assemble_variable will give
4224 DECL an rtl we can live with: (mem (const_int 0)). */
4225 type = TREE_TYPE (decl) = error_mark_node;
4228 /* Create a new scope to hold this declaration if necessary.
4229 Whether or not a new scope is necessary cannot be determined
4230 until after the type has been completed; if the type is a
4231 specialization of a class template it is not until after
4232 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4233 will be set correctly. */
4234 maybe_push_cleanup_level (type);
4237 /* Handle initialization of references. DECL, TYPE, and INIT have the
4238 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4239 but will be set to a new CLEANUP_STMT if a temporary is created
4240 that must be destroyed subsequently.
4242 Returns an initializer expression to use to initialize DECL, or
4243 NULL if the initialization can be performed statically.
4245 Quotes on semantics can be found in ARM 8.4.3. */
4248 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4252 if (init == NULL_TREE)
4254 if ((DECL_LANG_SPECIFIC (decl) == 0
4255 || DECL_IN_AGGR_P (decl) == 0)
4256 && ! DECL_THIS_EXTERN (decl))
4257 error ("%qD declared as reference but not initialized", decl);
4261 if (TREE_CODE (init) == CONSTRUCTOR)
4263 error ("ISO C++ forbids use of initializer list to "
4264 "initialize reference %qD", decl);
4268 if (TREE_CODE (init) == TREE_LIST)
4269 init = build_x_compound_expr_from_list (init, "initializer");
4271 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4272 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4273 /* Note: default conversion is only called in very special cases. */
4274 init = decay_conversion (init);
4276 /* Convert INIT to the reference type TYPE. This may involve the
4277 creation of a temporary, whose lifetime must be the same as that
4278 of the reference. If so, a DECL_EXPR for the temporary will be
4279 added just after the DECL_EXPR for DECL. That's why we don't set
4280 DECL_INITIAL for local references (instead assigning to them
4281 explicitly); we need to allow the temporary to be initialized
4283 tmp = initialize_reference (type, init, decl, cleanup);
4285 if (tmp == error_mark_node)
4287 else if (tmp == NULL_TREE)
4289 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4293 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4296 DECL_INITIAL (decl) = tmp;
4301 /* Designated initializers in arrays are not supported in GNU C++.
4302 The parser cannot detect this error since it does not know whether
4303 a given brace-enclosed initializer is for a class type or for an
4304 array. This function checks that CE does not use a designated
4305 initializer. If it does, an error is issued. Returns true if CE
4306 is valid, i.e., does not have a designated initializer. */
4309 check_array_designated_initializer (const constructor_elt *ce)
4311 /* Designated initializers for array elements are not supported. */
4314 /* The parser only allows identifiers as designated
4316 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4317 error ("name %qD used in a GNU-style designated "
4318 "initializer for an array", ce->index);
4325 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4326 array until we finish parsing the initializer. If that's the
4327 situation we're in, update DECL accordingly. */
4330 maybe_deduce_size_from_array_init (tree decl, tree init)
4332 tree type = TREE_TYPE (decl);
4334 if (TREE_CODE (type) == ARRAY_TYPE
4335 && TYPE_DOMAIN (type) == NULL_TREE
4336 && TREE_CODE (decl) != TYPE_DECL)
4338 /* do_default is really a C-ism to deal with tentative definitions.
4339 But let's leave it here to ease the eventual merge. */
4340 int do_default = !DECL_EXTERNAL (decl);
4341 tree initializer = init ? init : DECL_INITIAL (decl);
4344 /* Check that there are no designated initializers in INIT, as
4345 those are not supported in GNU C++, and as the middle-end
4346 will crash if presented with a non-numeric designated
4348 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4350 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4351 constructor_elt *ce;
4354 VEC_iterate (constructor_elt, v, i, ce);
4356 if (!check_array_designated_initializer (ce))
4362 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4366 error ("initializer fails to determine size of %qD", decl);
4367 TREE_TYPE (decl) = error_mark_node;
4369 else if (failure == 2)
4373 error ("array size missing in %qD", decl);
4374 TREE_TYPE (decl) = error_mark_node;
4376 /* If a `static' var's size isn't known, make it extern as
4377 well as static, so it does not get allocated. If it's not
4378 `static', then don't mark it extern; finish_incomplete_decl
4379 will give it a default size and it will get allocated. */
4380 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4381 DECL_EXTERNAL (decl) = 1;
4383 else if (failure == 3)
4385 error ("zero-size array %qD", decl);
4386 TREE_TYPE (decl) = error_mark_node;
4390 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4392 layout_decl (decl, 0);
4396 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4397 any appropriate error messages regarding the layout. */
4400 layout_var_decl (tree decl)
4404 type = TREE_TYPE (decl);
4405 if (type == error_mark_node)
4408 /* If we haven't already layed out this declaration, do so now.
4409 Note that we must not call complete type for an external object
4410 because it's type might involve templates that we are not
4411 supposed to instantiate yet. (And it's perfectly valid to say
4412 `extern X x' for some incomplete type `X'.) */
4413 if (!DECL_EXTERNAL (decl))
4414 complete_type (type);
4415 if (!DECL_SIZE (decl)
4416 && TREE_TYPE (decl) != error_mark_node
4417 && (COMPLETE_TYPE_P (type)
4418 || (TREE_CODE (type) == ARRAY_TYPE
4419 && !TYPE_DOMAIN (type)
4420 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4421 layout_decl (decl, 0);
4423 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4425 /* An automatic variable with an incomplete type: that is an error.
4426 Don't talk about array types here, since we took care of that
4427 message in grokdeclarator. */
4428 error ("storage size of %qD isn't known", decl);
4429 TREE_TYPE (decl) = error_mark_node;
4432 /* Keep this code around in case we later want to control debug info
4433 based on whether a type is "used". (jason 1999-11-11) */
4435 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4436 /* Let debugger know it should output info for this type. */
4437 note_debug_info_needed (ttype);
4439 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4440 note_debug_info_needed (DECL_CONTEXT (decl));
4443 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4444 && DECL_SIZE (decl) != NULL_TREE
4445 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4447 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4448 constant_expression_warning (DECL_SIZE (decl));
4450 error ("storage size of %qD isn't constant", decl);
4454 /* If a local static variable is declared in an inline function, or if
4455 we have a weak definition, we must endeavor to create only one
4456 instance of the variable at link-time. */
4459 maybe_commonize_var (tree decl)
4461 /* Static data in a function with comdat linkage also has comdat
4463 if (TREE_STATIC (decl)
4464 /* Don't mess with __FUNCTION__. */
4465 && ! DECL_ARTIFICIAL (decl)
4466 && DECL_FUNCTION_SCOPE_P (decl)
4467 /* Unfortunately, import_export_decl has not always been called
4468 before the function is processed, so we cannot simply check
4470 && (DECL_COMDAT (DECL_CONTEXT (decl))
4471 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4472 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4473 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4477 /* With weak symbols, we simply make the variable COMDAT;
4478 that will cause copies in multiple translations units to
4480 comdat_linkage (decl);
4484 if (DECL_INITIAL (decl) == NULL_TREE
4485 || DECL_INITIAL (decl) == error_mark_node)
4487 /* Without weak symbols, we can use COMMON to merge
4488 uninitialized variables. */
4489 TREE_PUBLIC (decl) = 1;
4490 DECL_COMMON (decl) = 1;
4494 /* While for initialized variables, we must use internal
4495 linkage -- which means that multiple copies will not
4497 TREE_PUBLIC (decl) = 0;
4498 DECL_COMMON (decl) = 0;
4499 warning (0, "sorry: semantics of inline function static "
4500 "data %q+#D are wrong (you'll wind up "
4501 "with multiple copies)", decl);
4502 warning (0, "%J you can work around this by removing "
4508 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4509 /* Set it up again; we might have set DECL_INITIAL since the last
4511 comdat_linkage (decl);
4514 /* Issue an error message if DECL is an uninitialized const variable. */
4517 check_for_uninitialized_const_var (tree decl)
4519 tree type = TREE_TYPE (decl);
4521 /* ``Unless explicitly declared extern, a const object does not have
4522 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4524 if (TREE_CODE (decl) == VAR_DECL
4525 && TREE_CODE (type) != REFERENCE_TYPE
4526 && CP_TYPE_CONST_P (type)
4527 && !TYPE_NEEDS_CONSTRUCTING (type)
4528 && !DECL_INITIAL (decl))
4529 error ("uninitialized const %qD", decl);
4533 /* Structure holding the current initializer being processed by reshape_init.
4534 CUR is a pointer to the current element being processed, END is a pointer
4535 after the last element present in the initializer. */
4536 typedef struct reshape_iterator_t
4538 constructor_elt *cur;
4539 constructor_elt *end;
4542 static tree reshape_init_r (tree, reshape_iter *, bool);
4544 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4545 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4546 initialized. If there are no more such fields, the return value
4550 next_initializable_field (tree field)
4553 && (TREE_CODE (field) != FIELD_DECL
4554 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4555 || DECL_ARTIFICIAL (field)))
4556 field = TREE_CHAIN (field);
4561 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4562 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4563 INTEGER_CST representing the size of the array minus one (the maximum index),
4564 or NULL_TREE if the array was declared without specifying the size. D is
4565 the iterator within the constructor. */
4568 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4571 bool sized_array_p = (max_index != NULL_TREE);
4572 unsigned HOST_WIDE_INT max_index_cst = 0;
4573 unsigned HOST_WIDE_INT index;
4575 /* The initializer for an array is always a CONSTRUCTOR. */
4576 new_init = build_constructor (NULL_TREE, NULL);
4580 /* Minus 1 is used for zero sized arrays. */
4581 if (integer_all_onesp (max_index))
4584 if (host_integerp (max_index, 1))
4585 max_index_cst = tree_low_cst (max_index, 1);
4586 /* sizetype is sign extended, not zero extended. */
4588 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4592 /* Loop until there are no more initializers. */
4594 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4599 check_array_designated_initializer (d->cur);
4600 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4601 if (elt_init == error_mark_node)
4602 return error_mark_node;
4603 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4609 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4610 Parameters are the same of reshape_init_r. */
4613 reshape_init_array (tree type, reshape_iter *d)
4615 tree max_index = NULL_TREE;
4617 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4619 if (TYPE_DOMAIN (type))
4620 max_index = array_type_nelts (type);
4622 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4625 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4626 Parameters are the same of reshape_init_r. */
4629 reshape_init_vector (tree type, reshape_iter *d)
4631 tree max_index = NULL_TREE;
4634 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4636 if (COMPOUND_LITERAL_P (d->cur->value))
4638 tree value = d->cur->value;
4639 if (!same_type_p (TREE_TYPE (value), type))
4641 error ("invalid type %qT as initializer for a vector of type %qT",
4642 TREE_TYPE (d->cur->value), type);
4643 value = error_mark_node;
4649 /* For a vector, the representation type is a struct
4650 containing a single member which is an array of the
4651 appropriate size. */
4652 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4653 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4654 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4656 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4659 /* Subroutine of reshape_init_r, processes the initializers for classes
4660 or union. Parameters are the same of reshape_init_r. */
4663 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4668 gcc_assert (CLASS_TYPE_P (type));
4670 /* The initializer for a class is always a CONSTRUCTOR. */
4671 new_init = build_constructor (NULL_TREE, NULL);
4672 field = next_initializable_field (TYPE_FIELDS (type));
4678 An initializer for an aggregate member that is an
4679 empty class shall have the form of an empty
4680 initializer-list {}. */
4681 if (!first_initializer_p)
4683 error ("initializer for %qT must be brace-enclosed", type);
4684 return error_mark_node;
4689 /* Loop through the initializable fields, gathering initializers. */
4690 while (d->cur != d->end)
4694 /* Handle designated initializers, as an extension. */
4697 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4699 if (!field || TREE_CODE (field) != FIELD_DECL)
4701 error ("%qT has no non-static data member named %qD", type,
4703 return error_mark_node;
4707 /* If we processed all the member of the class, we are done. */
4711 field_init = reshape_init_r (TREE_TYPE (field), d,
4712 /*first_initializer_p=*/false);
4713 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4717 When a union is initialized with a brace-enclosed
4718 initializer, the braces shall only contain an
4719 initializer for the first member of the union. */
4720 if (TREE_CODE (type) == UNION_TYPE)
4723 field = next_initializable_field (TREE_CHAIN (field));
4729 /* Subroutine of reshape_init, which processes a single initializer (part of
4730 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4731 iterator within the CONSTRUCTOR which points to the initializer to process.
4732 FIRST_INITIALIZER_P is true if this is the first initializer of the
4733 CONSTRUCTOR node. */
4736 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4738 tree init = d->cur->value;
4740 /* A non-aggregate type is always initialized with a single
4742 if (!CP_AGGREGATE_TYPE_P (type))
4744 /* It is invalid to initialize a non-aggregate type with a
4745 brace-enclosed initializer.
4746 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4747 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4748 a CONSTRUCTOR (with a record type). */
4749 if (TREE_CODE (init) == CONSTRUCTOR
4750 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4752 error ("braces around scalar initializer for type %qT", type);
4753 init = error_mark_node;
4762 All implicit type conversions (clause _conv_) are considered when
4763 initializing the aggregate member with an initializer from an
4764 initializer-list. If the initializer can initialize a member,
4765 the member is initialized. Otherwise, if the member is itself a
4766 non-empty subaggregate, brace elision is assumed and the
4767 initializer is considered for the initialization of the first
4768 member of the subaggregate. */
4769 if (TREE_CODE (init) != CONSTRUCTOR
4770 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4776 /* [dcl.init.string]
4778 A char array (whether plain char, signed char, or unsigned char)
4779 can be initialized by a string-literal (optionally enclosed in
4780 braces); a wchar_t array can be initialized by a wide
4781 string-literal (optionally enclosed in braces). */
4782 if (TREE_CODE (type) == ARRAY_TYPE
4783 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4785 tree str_init = init;
4787 /* Strip one level of braces if and only if they enclose a single
4788 element (as allowed by [dcl.init.string]). */
4789 if (!first_initializer_p
4790 && TREE_CODE (str_init) == CONSTRUCTOR
4791 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4793 str_init = VEC_index (constructor_elt,
4794 CONSTRUCTOR_ELTS (str_init), 0)->value;
4797 /* If it's a string literal, then it's the initializer for the array
4798 as a whole. Otherwise, continue with normal initialization for
4799 array types (one value per array element). */
4800 if (TREE_CODE (str_init) == STRING_CST)
4807 /* The following cases are about aggregates. If we are not within a full
4808 initializer already, and there is not a CONSTRUCTOR, it means that there
4809 is a missing set of braces (that is, we are processing the case for
4810 which reshape_init exists). */
4811 if (!first_initializer_p)
4813 if (TREE_CODE (init) == CONSTRUCTOR)
4815 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4816 /* There is no need to reshape pointer-to-member function
4817 initializers, as they are always constructed correctly
4818 by the front end. */
4820 else if (COMPOUND_LITERAL_P (init))
4821 /* For a nested compound literal, there is no need to reshape since
4822 brace elision is not allowed. Even if we decided to allow it,
4823 we should add a call to reshape_init in finish_compound_literal,
4824 before calling digest_init, so changing this code would still
4825 not be necessary. */
4826 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4830 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4831 return reshape_init (type, init);
4835 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4839 /* Dispatch to specialized routines. */
4840 if (CLASS_TYPE_P (type))
4841 return reshape_init_class (type, d, first_initializer_p);
4842 else if (TREE_CODE (type) == ARRAY_TYPE)
4843 return reshape_init_array (type, d);
4844 else if (TREE_CODE (type) == VECTOR_TYPE)
4845 return reshape_init_vector (type, d);
4850 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4851 brace-enclosed aggregate initializer.
4853 INIT is the CONSTRUCTOR containing the list of initializers describing
4854 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4855 It may not presently match the shape of the TYPE; for example:
4857 struct S { int a; int b; };
4858 struct S a[] = { 1, 2, 3, 4 };
4860 Here INIT will hold a VEC of four elements, rather than a
4861 VEC of two elements, each itself a VEC of two elements. This
4862 routine transforms INIT from the former form into the latter. The
4863 revised CONSTRUCTOR node is returned. */
4866 reshape_init (tree type, tree init)
4868 VEC(constructor_elt, gc) *v;
4872 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4874 v = CONSTRUCTOR_ELTS (init);
4876 /* An empty constructor does not need reshaping, and it is always a valid
4878 if (VEC_empty (constructor_elt, v))
4881 /* Recurse on this CONSTRUCTOR. */
4882 d.cur = VEC_index (constructor_elt, v, 0);
4883 d.end = d.cur + VEC_length (constructor_elt, v);
4885 new_init = reshape_init_r (type, &d, true);
4886 if (new_init == error_mark_node)
4887 return error_mark_node;
4889 /* Make sure all the element of the constructor were used. Otherwise,
4890 issue an error about exceeding initializers. */
4892 error ("too many initializers for %qT", type);
4897 /* Verify INIT (the initializer for DECL), and record the
4898 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4899 grok_reference_init.
4901 If the return value is non-NULL, it is an expression that must be
4902 evaluated dynamically to initialize DECL. */
4905 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4907 tree type = TREE_TYPE (decl);
4908 tree init_code = NULL;
4910 /* Things that are going to be initialized need to have complete
4912 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4914 if (type == error_mark_node)
4915 /* We will have already complained. */
4918 if (TREE_CODE (type) == ARRAY_TYPE)
4920 tree element_type = TREE_TYPE (type);
4922 /* The array type itself need not be complete, because the
4923 initializer may tell us how many elements are in the array.
4924 But, the elements of the array must be complete. */
4925 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4927 error ("elements of array %q#D have incomplete type", decl);
4930 /* It is not valid to initialize a VLA. */
4932 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4933 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4935 error ("variable-sized object %qD may not be initialized", decl);
4939 else if (!COMPLETE_TYPE_P (type))
4941 error ("%qD has incomplete type", decl);
4942 TREE_TYPE (decl) = error_mark_node;
4946 /* There is no way to make a variable-sized class type in GNU C++. */
4947 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4949 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4951 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4952 if (SCALAR_TYPE_P (type))
4956 error ("scalar object %qD requires one element in initializer",
4958 TREE_TYPE (decl) = error_mark_node;
4962 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4964 /* A non-aggregate that is not a scalar cannot be initialized
4965 via an initializer-list in C++98. */
4966 error ("braces around initializer for non-aggregate type %qT",
4968 TREE_TYPE (decl) = error_mark_node;
4973 if (TREE_CODE (decl) == CONST_DECL)
4975 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4977 DECL_INITIAL (decl) = init;
4979 gcc_assert (init != NULL_TREE);
4982 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4983 init = grok_reference_init (decl, type, init, cleanup);
4986 /* Do not reshape constructors of vectors (they don't need to be
4988 if (TREE_CODE (init) == CONSTRUCTOR
4989 && !COMPOUND_LITERAL_P (init)
4990 && !TREE_TYPE (init)) /* ptrmemfunc */
4992 init = reshape_init (type, init);
4994 if ((*targetm.vector_opaque_p) (type))
4996 error ("opaque vector types cannot be initialized");
4997 init = error_mark_node;
5001 /* If DECL has an array type without a specific bound, deduce the
5002 array size from the initializer. */
5003 maybe_deduce_size_from_array_init (decl, init);
5004 type = TREE_TYPE (decl);
5005 if (type == error_mark_node)
5008 if (TREE_CODE (type) == ARRAY_TYPE && TYPE_NEEDS_CONSTRUCTING (type))
5009 goto initialize_aggr;
5010 else if (CLASS_TYPE_P (type))
5012 if (TREE_CODE (init) == CONSTRUCTOR)
5014 if (TYPE_NON_AGGREGATE_CLASS (type))
5016 error ("%qD must be initialized by constructor, "
5019 init = error_mark_node;
5022 goto dont_use_constructor;
5026 int saved_stmts_are_full_exprs_p;
5029 saved_stmts_are_full_exprs_p = 0;
5030 if (building_stmt_tree ())
5032 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5033 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5035 init = build_aggr_init (decl, init, flags);
5036 if (building_stmt_tree ())
5037 current_stmt_tree ()->stmts_are_full_exprs_p =
5038 saved_stmts_are_full_exprs_p;
5044 dont_use_constructor:
5045 if (TREE_CODE (init) != TREE_VEC)
5047 init_code = store_init_value (decl, init);
5048 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5049 && DECL_INITIAL (decl)
5050 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5051 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5052 warning (0, "array %qD initialized by parenthesized string literal %qE",
5053 decl, DECL_INITIAL (decl));
5058 else if (DECL_EXTERNAL (decl))
5060 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5061 goto initialize_aggr;
5062 else if (IS_AGGR_TYPE (type))
5064 tree core_type = strip_array_types (type);
5066 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5067 error ("structure %qD with uninitialized const members", decl);
5068 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5069 error ("structure %qD with uninitialized reference members", decl);
5071 check_for_uninitialized_const_var (decl);
5074 check_for_uninitialized_const_var (decl);
5076 if (init && init != error_mark_node)
5077 init_code = build2 (INIT_EXPR, type, decl, init);
5082 /* If DECL is not a local variable, give it RTL. */
5085 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5087 int toplev = toplevel_bindings_p ();
5089 const char *filename;
5091 /* Set the DECL_ASSEMBLER_NAME for the object. */
5094 /* The `register' keyword, when used together with an
5095 asm-specification, indicates that the variable should be
5096 placed in a particular register. */
5097 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5099 set_user_assembler_name (decl, asmspec);
5100 DECL_HARD_REGISTER (decl) = 1;
5104 if (TREE_CODE (decl) == FUNCTION_DECL
5105 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5106 set_builtin_user_assembler_name (decl, asmspec);
5107 set_user_assembler_name (decl, asmspec);
5111 /* Handle non-variables up front. */
5112 if (TREE_CODE (decl) != VAR_DECL)
5114 rest_of_decl_compilation (decl, toplev, at_eof);
5118 /* If we see a class member here, it should be a static data
5120 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5122 gcc_assert (TREE_STATIC (decl));
5123 /* An in-class declaration of a static data member should be
5124 external; it is only a declaration, and not a definition. */
5125 if (init == NULL_TREE)
5126 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5129 /* We don't create any RTL for local variables. */
5130 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5133 /* We defer emission of local statics until the corresponding
5134 DECL_EXPR is expanded. */
5135 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5137 /* We try to defer namespace-scope static constants so that they are
5138 not emitted into the object file unnecessarily. */
5139 filename = input_filename;
5140 if (!DECL_VIRTUAL_P (decl)
5141 && TREE_READONLY (decl)
5142 && DECL_INITIAL (decl) != NULL_TREE
5143 && DECL_INITIAL (decl) != error_mark_node
5145 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5147 && !TREE_PUBLIC (decl))
5149 /* Fool with the linkage of static consts according to #pragma
5151 struct c_fileinfo *finfo = get_fileinfo (filename);
5152 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5154 TREE_PUBLIC (decl) = 1;
5155 DECL_EXTERNAL (decl) = finfo->interface_only;
5160 /* Likewise for template instantiations. */
5161 else if (DECL_LANG_SPECIFIC (decl)
5162 && DECL_IMPLICIT_INSTANTIATION (decl))
5165 /* If we're not deferring, go ahead and assemble the variable. */
5167 rest_of_decl_compilation (decl, toplev, at_eof);
5170 /* walk_tree helper for wrap_temporary_cleanups, below. */
5173 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5175 if (TYPE_P (*stmt_p))
5181 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5183 tree guard = (tree)data;
5184 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5186 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5187 /* Tell honor_protect_cleanup_actions to handle this as a separate
5189 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5191 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5197 /* We're initializing a local variable which has a cleanup GUARD. If there
5198 are any temporaries used in the initializer INIT of this variable, we
5199 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5200 variable will be cleaned up properly if one of them throws.
5202 Unfortunately, there's no way to express this properly in terms of
5203 nesting, as the regions for the temporaries overlap the region for the
5204 variable itself; if there are two temporaries, the variable needs to be
5205 the first thing destroyed if either of them throws. However, we only
5206 want to run the variable's cleanup if it actually got constructed. So
5207 we need to guard the temporary cleanups with the variable's cleanup if
5208 they are run on the normal path, but not if they are run on the
5209 exceptional path. We implement this by telling
5210 honor_protect_cleanup_actions to strip the variable cleanup from the
5211 exceptional path. */
5214 wrap_temporary_cleanups (tree init, tree guard)
5216 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5219 /* Generate code to initialize DECL (a local variable). */
5222 initialize_local_var (tree decl, tree init)
5224 tree type = TREE_TYPE (decl);
5228 gcc_assert (TREE_CODE (decl) == VAR_DECL
5229 || TREE_CODE (decl) == RESULT_DECL);
5230 gcc_assert (!TREE_STATIC (decl));
5232 if (DECL_SIZE (decl) == NULL_TREE)
5234 /* If we used it already as memory, it must stay in memory. */
5235 DECL_INITIAL (decl) = NULL_TREE;
5236 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5240 if (type == error_mark_node)
5243 /* Compute and store the initial value. */
5244 already_used = TREE_USED (decl) || TREE_USED (type);
5246 /* Generate a cleanup, if necessary. */
5247 cleanup = cxx_maybe_build_cleanup (decl);
5249 /* Perform the initialization. */
5252 int saved_stmts_are_full_exprs_p;
5254 /* If we're only initializing a single object, guard the destructors
5255 of any temporaries used in its initializer with its destructor.
5256 This isn't right for arrays because each element initialization is
5257 a full-expression. */
5258 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5259 wrap_temporary_cleanups (init, cleanup);
5261 gcc_assert (building_stmt_tree ());
5262 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5263 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5264 finish_expr_stmt (init);
5265 current_stmt_tree ()->stmts_are_full_exprs_p =
5266 saved_stmts_are_full_exprs_p;
5269 /* Set this to 0 so we can tell whether an aggregate which was
5270 initialized was ever used. Don't do this if it has a
5271 destructor, so we don't complain about the 'resource
5272 allocation is initialization' idiom. Now set
5273 attribute((unused)) on types so decls of that type will be
5274 marked used. (see TREE_USED, above.) */
5275 if (TYPE_NEEDS_CONSTRUCTING (type)
5277 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5278 && DECL_NAME (decl))
5279 TREE_USED (decl) = 0;
5280 else if (already_used)
5281 TREE_USED (decl) = 1;
5284 finish_decl_cleanup (decl, cleanup);
5287 /* DECL is a VAR_DECL for a compiler-generated variable with static
5288 storage duration (like a virtual table) whose initializer is a
5289 compile-time constant. INIT must be either a TREE_LIST of values,
5290 or a CONSTRUCTOR. Initialize the variable and provide it to the
5294 initialize_artificial_var (tree decl, tree init)
5296 gcc_assert (DECL_ARTIFICIAL (decl));
5297 if (TREE_CODE (init) == TREE_LIST)
5298 init = build_constructor_from_list (NULL_TREE, init);
5299 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5300 DECL_INITIAL (decl) = init;
5301 DECL_INITIALIZED_P (decl) = 1;
5302 determine_visibility (decl);
5303 layout_var_decl (decl);
5304 maybe_commonize_var (decl);
5305 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5308 /* INIT is the initializer for a variable, as represented by the
5309 parser. Returns true iff INIT is value-dependent. */
5312 value_dependent_init_p (tree init)
5314 if (TREE_CODE (init) == TREE_LIST)
5315 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5316 return any_value_dependent_elements_p (init);
5317 else if (TREE_CODE (init) == CONSTRUCTOR)
5318 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5320 VEC(constructor_elt, gc) *elts;
5324 elts = CONSTRUCTOR_ELTS (init);
5325 nelts = VEC_length (constructor_elt, elts);
5326 for (i = 0; i < nelts; ++i)
5327 if (value_dependent_init_p (VEC_index (constructor_elt,
5332 /* It must be a simple expression, e.g., int i = 3; */
5333 return value_dependent_expression_p (init);
5338 /* Finish processing of a declaration;
5339 install its line number and initial value.
5340 If the length of an array type is not known before,
5341 it must be determined now, from the initial value, or it is an error.
5343 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5344 true, then INIT is an integral constant expression.
5346 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5347 if the (init) syntax was used. */
5350 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5351 tree asmspec_tree, int flags)
5355 const char *asmspec = NULL;
5356 int was_readonly = 0;
5357 bool var_definition_p = false;
5358 int saved_processing_template_decl;
5360 if (decl == error_mark_node)
5365 error ("assignment (not initialization) in declaration");
5369 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5370 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5371 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5373 type = TREE_TYPE (decl);
5374 if (type == error_mark_node)
5377 /* Assume no cleanup is required. */
5378 cleanup = NULL_TREE;
5379 saved_processing_template_decl = processing_template_decl;
5381 /* If a name was specified, get the string. */
5382 if (global_scope_p (current_binding_level))
5383 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5384 if (asmspec_tree && asmspec_tree != error_mark_node)
5385 asmspec = TREE_STRING_POINTER (asmspec_tree);
5387 if (current_class_type
5388 && CP_DECL_CONTEXT (decl) == current_class_type
5389 && TYPE_BEING_DEFINED (current_class_type)
5390 && (DECL_INITIAL (decl) || init))
5391 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5393 if (processing_template_decl)
5395 bool type_dependent_p;
5397 /* Add this declaration to the statement-tree. */
5398 if (at_function_scope_p ())
5399 add_decl_expr (decl);
5401 type_dependent_p = dependent_type_p (type);
5403 if (check_for_bare_parameter_packs (init))
5406 DECL_INITIAL (decl) = NULL_TREE;
5409 if (init && init_const_expr_p)
5411 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5412 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5413 TREE_CONSTANT (decl) = 1;
5416 /* Generally, initializers in templates are expanded when the
5417 template is instantiated. But, if DECL is an integral
5418 constant static data member, then it can be used in future
5419 integral constant expressions, and its value must be
5422 && DECL_CLASS_SCOPE_P (decl)
5423 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5424 && !type_dependent_p
5425 && !value_dependent_init_p (init)))
5428 DECL_INITIAL (decl) = init;
5429 if (TREE_CODE (decl) == VAR_DECL
5430 && !DECL_PRETTY_FUNCTION_P (decl)
5431 && !type_dependent_p)
5432 maybe_deduce_size_from_array_init (decl, init);
5436 if (TREE_CODE (init) == TREE_LIST)
5438 /* If the parenthesized-initializer form was used (e.g.,
5439 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5440 arguments. (There is generally only one.) We convert them
5443 for (; list; list = TREE_CHAIN (list))
5445 tree elt = TREE_VALUE (list);
5446 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5450 init = fold_non_dependent_expr (init);
5451 processing_template_decl = 0;
5454 /* Take care of TYPE_DECLs up front. */
5455 if (TREE_CODE (decl) == TYPE_DECL)
5457 if (type != error_mark_node
5458 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5460 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5461 warning (0, "shadowing previous type declaration of %q#D", decl);
5462 set_identifier_type_value (DECL_NAME (decl), decl);
5465 /* If we have installed this as the canonical typedef for this
5466 type, and that type has not been defined yet, delay emitting
5467 the debug information for it, as we will emit it later. */
5468 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5469 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5470 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5472 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5477 /* A reference will be modified here, as it is initialized. */
5478 if (! DECL_EXTERNAL (decl)
5479 && TREE_READONLY (decl)
5480 && TREE_CODE (type) == REFERENCE_TYPE)
5483 TREE_READONLY (decl) = 0;
5486 if (TREE_CODE (decl) == VAR_DECL)
5488 /* Only PODs can have thread-local storage. Other types may require
5489 various kinds of non-trivial initialization. */
5490 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5491 error ("%qD cannot be thread-local because it has non-POD type %qT",
5492 decl, TREE_TYPE (decl));
5493 /* If this is a local variable that will need a mangled name,
5494 register it now. We must do this before processing the
5495 initializer for the variable, since the initialization might
5496 require a guard variable, and since the mangled name of the
5497 guard variable will depend on the mangled name of this
5499 if (DECL_FUNCTION_SCOPE_P (decl)
5500 && TREE_STATIC (decl)
5501 && !DECL_ARTIFICIAL (decl))
5502 push_local_name (decl);
5503 /* Convert the initializer to the type of DECL, if we have not
5504 already initialized DECL. */
5505 if (!DECL_INITIALIZED_P (decl)
5506 /* If !DECL_EXTERNAL then DECL is being defined. In the
5507 case of a static data member initialized inside the
5508 class-specifier, there can be an initializer even if DECL
5509 is *not* defined. */
5510 && (!DECL_EXTERNAL (decl) || init))
5512 if (TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5515 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5516 /* Allow libjava/prims.cc define primitive classes. */
5517 if (init != NULL_TREE
5518 || jclass == NULL_TREE
5519 || TREE_CODE (jclass) != TYPE_DECL
5520 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5521 || !same_type_ignoring_top_level_qualifiers_p
5522 (type, TREE_TYPE (TREE_TYPE (jclass))))
5523 error ("Java object %qD not allocated with %<new%>", decl);
5528 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5529 if (init_const_expr_p)
5531 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5532 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5533 TREE_CONSTANT (decl) = 1;
5536 init = check_initializer (decl, init, flags, &cleanup);
5537 /* Thread-local storage cannot be dynamically initialized. */
5538 if (DECL_THREAD_LOCAL_P (decl) && init)
5540 error ("%qD is thread-local and so cannot be dynamically "
5541 "initialized", decl);
5545 /* Check that the initializer for a static data member was a
5546 constant. Although we check in the parser that the
5547 initializer is an integral constant expression, we do not
5548 simplify division-by-zero at the point at which it
5549 occurs. Therefore, in:
5551 struct S { static const int i = 7 / 0; };
5553 we issue an error at this point. It would
5554 probably be better to forbid division by zero in
5555 integral constant expressions. */
5556 if (DECL_EXTERNAL (decl) && init)
5558 error ("%qD cannot be initialized by a non-constant expression"
5559 " when being declared", decl);
5560 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5568 The memory occupied by any object of static storage
5569 duration is zero-initialized at program startup before
5570 any other initialization takes place.
5572 We cannot create an appropriate initializer until after
5573 the type of DECL is finalized. If DECL_INITIAL is set,
5574 then the DECL is statically initialized, and any
5575 necessary zero-initialization has already been performed. */
5576 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5577 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5578 /*nelts=*/NULL_TREE,
5579 /*static_storage_p=*/true);
5580 /* Remember that the initialization for this variable has
5582 DECL_INITIALIZED_P (decl) = 1;
5583 /* This declaration is the definition of this variable,
5584 unless we are initializing a static data member within
5585 the class specifier. */
5586 if (!DECL_EXTERNAL (decl))
5587 var_definition_p = true;
5589 /* If the variable has an array type, lay out the type, even if
5590 there is no initializer. It is valid to index through the
5591 array, and we must get TYPE_ALIGN set correctly on the array
5593 else if (TREE_CODE (type) == ARRAY_TYPE)
5596 else if (TREE_CODE (decl) == FIELD_DECL
5597 && TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5598 error ("non-static data member %qD has Java class type", decl);
5600 /* Add this declaration to the statement-tree. This needs to happen
5601 after the call to check_initializer so that the DECL_EXPR for a
5602 reference temp is added before the DECL_EXPR for the reference itself. */
5603 if (at_function_scope_p ())
5604 add_decl_expr (decl);
5606 /* Let the middle end know about variables and functions -- but not
5607 static data members in uninstantiated class templates. */
5608 if (!saved_processing_template_decl
5609 && (TREE_CODE (decl) == VAR_DECL
5610 || TREE_CODE (decl) == FUNCTION_DECL))
5612 if (TREE_CODE (decl) == VAR_DECL)
5614 layout_var_decl (decl);
5615 maybe_commonize_var (decl);
5618 /* This needs to happen after the linkage is set. */
5619 determine_visibility (decl);
5621 if (var_definition_p && TREE_STATIC (decl))
5623 /* If a TREE_READONLY variable needs initialization
5624 at runtime, it is no longer readonly and we need to
5625 avoid MEM_READONLY_P being set on RTL created for it. */
5628 if (TREE_READONLY (decl))
5629 TREE_READONLY (decl) = 0;
5632 else if (was_readonly)
5633 TREE_READONLY (decl) = 1;
5636 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5638 /* Check for abstractness of the type. Notice that there is no
5639 need to strip array types here since the check for those types
5640 is already done within create_array_type_for_decl. */
5641 if (TREE_CODE (type) == FUNCTION_TYPE
5642 || TREE_CODE (type) == METHOD_TYPE)
5643 abstract_virtuals_error (decl, TREE_TYPE (type));
5645 abstract_virtuals_error (decl, type);
5647 if (TREE_CODE (decl) == FUNCTION_DECL
5648 || TREE_TYPE (decl) == error_mark_node)
5649 /* No initialization required. */
5651 else if (DECL_EXTERNAL (decl)
5652 && ! (DECL_LANG_SPECIFIC (decl)
5653 && DECL_NOT_REALLY_EXTERN (decl)))
5656 DECL_INITIAL (decl) = init;
5658 /* A variable definition. */
5659 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5660 /* Initialize the local variable. */
5661 initialize_local_var (decl, init);
5663 /* If a variable is defined, and then a subsequent
5664 definition with external linkage is encountered, we will
5665 get here twice for the same variable. We want to avoid
5666 calling expand_static_init more than once. For variables
5667 that are not static data members, we can call
5668 expand_static_init only when we actually process the
5669 initializer. It is not legal to redeclare a static data
5670 member, so this issue does not arise in that case. */
5671 else if (var_definition_p && TREE_STATIC (decl))
5672 expand_static_init (decl, init);
5675 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5676 reference, insert it in the statement-tree now. */
5678 push_cleanup (decl, cleanup, false);
5681 processing_template_decl = saved_processing_template_decl;
5684 TREE_READONLY (decl) = 1;
5686 /* If this was marked 'used', be sure it will be output. */
5687 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5688 mark_decl_referenced (decl);
5691 /* This is here for a midend callback from c-common.c. */
5694 finish_decl (tree decl, tree init, tree asmspec_tree)
5696 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5699 /* Returns a declaration for a VAR_DECL as if:
5701 extern "C" TYPE NAME;
5703 had been seen. Used to create compiler-generated global
5707 declare_global_var (tree name, tree type)
5711 push_to_top_level ();
5712 decl = build_decl (VAR_DECL, name, type);
5713 TREE_PUBLIC (decl) = 1;
5714 DECL_EXTERNAL (decl) = 1;
5715 DECL_ARTIFICIAL (decl) = 1;
5716 /* If the user has explicitly declared this variable (perhaps
5717 because the code we are compiling is part of a low-level runtime
5718 library), then it is possible that our declaration will be merged
5719 with theirs by pushdecl. */
5720 decl = pushdecl (decl);
5721 finish_decl (decl, NULL_TREE, NULL_TREE);
5722 pop_from_top_level ();
5727 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5728 if "__cxa_atexit" is not being used) corresponding to the function
5729 to be called when the program exits. */
5732 get_atexit_fn_ptr_type (void)
5737 if (!atexit_fn_ptr_type_node)
5739 if (flag_use_cxa_atexit
5740 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5741 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5742 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5744 /* The parameter to "atexit" is "void (*)(void)". */
5745 arg_types = void_list_node;
5747 fn_type = build_function_type (void_type_node, arg_types);
5748 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5751 return atexit_fn_ptr_type_node;
5754 /* Returns a pointer to the `atexit' function. Note that if
5755 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5756 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5759 get_atexit_node (void)
5766 bool use_aeabi_atexit;
5771 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5773 /* The declaration for `__cxa_atexit' is:
5775 int __cxa_atexit (void (*)(void *), void *, void *)
5777 We build up the argument types and then then function type
5780 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5781 /* First, build the pointer-to-function type for the first
5783 fn_ptr_type = get_atexit_fn_ptr_type ();
5784 /* Then, build the rest of the argument types. */
5785 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5786 if (use_aeabi_atexit)
5788 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5789 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5793 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5794 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5796 /* And the final __cxa_atexit type. */
5797 fn_type = build_function_type (integer_type_node, arg_types);
5798 fn_ptr_type = build_pointer_type (fn_type);
5799 if (use_aeabi_atexit)
5800 name = "__aeabi_atexit";
5802 name = "__cxa_atexit";
5806 /* The declaration for `atexit' is:
5808 int atexit (void (*)());
5810 We build up the argument types and then then function type
5812 fn_ptr_type = get_atexit_fn_ptr_type ();
5813 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5814 /* Build the final atexit type. */
5815 fn_type = build_function_type (integer_type_node, arg_types);
5819 /* Now, build the function declaration. */
5820 push_lang_context (lang_name_c);
5821 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5822 mark_used (atexit_fndecl);
5823 pop_lang_context ();
5824 atexit_node = decay_conversion (atexit_fndecl);
5829 /* Returns the __dso_handle VAR_DECL. */
5832 get_dso_handle_node (void)
5834 if (dso_handle_node)
5835 return dso_handle_node;
5837 /* Declare the variable. */
5838 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5841 return dso_handle_node;
5844 /* Begin a new function with internal linkage whose job will be simply
5845 to destroy some particular variable. */
5847 static GTY(()) int start_cleanup_cnt;
5850 start_cleanup_fn (void)
5855 bool use_cxa_atexit = flag_use_cxa_atexit
5856 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5858 push_to_top_level ();
5860 /* No need to mangle this. */
5861 push_lang_context (lang_name_c);
5863 /* Build the name of the function. */
5864 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5865 /* Build the function declaration. */
5866 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5867 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5868 /* It's a function with internal linkage, generated by the
5870 TREE_PUBLIC (fndecl) = 0;
5871 DECL_ARTIFICIAL (fndecl) = 1;
5872 /* Make the function `inline' so that it is only emitted if it is
5873 actually needed. It is unlikely that it will be inlined, since
5874 it is only called via a function pointer, but we avoid unnecessary
5875 emissions this way. */
5876 DECL_INLINE (fndecl) = 1;
5877 DECL_DECLARED_INLINE_P (fndecl) = 1;
5878 DECL_INTERFACE_KNOWN (fndecl) = 1;
5879 /* Build the parameter. */
5884 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5885 DECL_CONTEXT (parmdecl) = fndecl;
5886 TREE_USED (parmdecl) = 1;
5887 DECL_ARGUMENTS (fndecl) = parmdecl;
5891 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5893 pop_lang_context ();
5895 return current_function_decl;
5898 /* Finish the cleanup function begun by start_cleanup_fn. */
5901 end_cleanup_fn (void)
5903 expand_or_defer_fn (finish_function (0));
5905 pop_from_top_level ();
5908 /* Generate code to handle the destruction of DECL, an object with
5909 static storage duration. */
5912 register_dtor_fn (tree decl)
5921 type = TREE_TYPE (decl);
5922 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5923 return void_zero_node;
5925 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5926 a class object, we can just pass the destructor to
5927 "__cxa_atexit"; we don't have to build a temporary function to do
5929 use_dtor = (flag_use_cxa_atexit
5930 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5931 && CLASS_TYPE_P (type));
5936 /* Find the destructor. */
5937 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5938 gcc_assert (idx >= 0);
5939 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5940 /* Make sure it is accessible. */
5941 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5945 /* Call build_cleanup before we enter the anonymous function so
5946 that any access checks will be done relative to the current
5947 scope, rather than the scope of the anonymous function. */
5948 build_cleanup (decl);
5950 /* Now start the function. */
5951 cleanup = start_cleanup_fn ();
5953 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5954 to the original function, rather than the anonymous one. That
5955 will make the back end think that nested functions are in use,
5956 which causes confusion. */
5957 push_deferring_access_checks (dk_no_check);
5958 fcall = build_cleanup (decl);
5959 pop_deferring_access_checks ();
5961 /* Create the body of the anonymous function. */
5962 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5963 finish_expr_stmt (fcall);
5964 finish_compound_stmt (compound_stmt);
5968 /* Call atexit with the cleanup function. */
5969 mark_used (cleanup);
5970 cleanup = build_address (cleanup);
5971 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5977 /* We must convert CLEANUP to the type that "__cxa_atexit"
5979 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5980 /* "__cxa_atexit" will pass the address of DECL to the
5981 cleanup function. */
5983 addr = build_address (decl);
5984 /* The declared type of the parameter to "__cxa_atexit" is
5985 "void *". For plain "T*", we could just let the
5986 machinery in build_function_call convert it -- but if the
5987 type is "cv-qualified T *", then we need to convert it
5988 before passing it in, to avoid spurious errors. */
5989 addr = build_nop (ptr_type_node, addr);
5992 /* Since the cleanup functions we build ignore the address
5993 they're given, there's no reason to pass the actual address
5994 in, and, in general, it's cheaper to pass NULL than any
5996 addr = null_pointer_node;
5997 args = tree_cons (NULL_TREE,
5998 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
6000 if (targetm.cxx.use_aeabi_atexit ())
6002 args = tree_cons (NULL_TREE, cleanup, args);
6003 args = tree_cons (NULL_TREE, addr, args);
6007 args = tree_cons (NULL_TREE, addr, args);
6008 args = tree_cons (NULL_TREE, cleanup, args);
6012 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6013 return build_function_call (get_atexit_node (), args);
6016 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6017 is its initializer. Generate code to handle the construction
6018 and destruction of DECL. */
6021 expand_static_init (tree decl, tree init)
6023 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6024 gcc_assert (TREE_STATIC (decl));
6026 /* Some variables require no initialization. */
6028 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6029 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6032 if (DECL_FUNCTION_SCOPE_P (decl))
6034 /* Emit code to perform this initialization but once. */
6035 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6036 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6037 tree guard, guard_addr;
6038 tree acquire_fn, release_fn, abort_fn;
6041 /* Emit code to perform this initialization but once. This code
6044 static <type> guard;
6045 if (!guard.first_byte) {
6046 if (__cxa_guard_acquire (&guard)) {
6049 // Do initialization.
6050 flag = true; __cxa_guard_release (&guard);
6051 // Register variable for destruction at end of program.
6053 if (!flag) __cxa_guard_abort (&guard);
6057 Note that the `flag' variable is only set to 1 *after* the
6058 initialization is complete. This ensures that an exception,
6059 thrown during the construction, will cause the variable to
6060 reinitialized when we pass through this code again, as per:
6064 If the initialization exits by throwing an exception, the
6065 initialization is not complete, so it will be tried again
6066 the next time control enters the declaration.
6068 This process should be thread-safe, too; multiple threads
6069 should not be able to initialize the variable more than
6072 /* Create the guard variable. */
6073 guard = get_guard (decl);
6075 /* This optimization isn't safe on targets with relaxed memory
6076 consistency. On such targets we force synchronization in
6077 __cxa_guard_acquire. */
6078 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6080 /* Begin the conditional initialization. */
6081 if_stmt = begin_if_stmt ();
6082 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6083 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6086 if (flag_threadsafe_statics)
6088 guard_addr = build_address (guard);
6090 acquire_fn = get_identifier ("__cxa_guard_acquire");
6091 release_fn = get_identifier ("__cxa_guard_release");
6092 abort_fn = get_identifier ("__cxa_guard_abort");
6093 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6095 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6097 tree vfntype = build_function_type (void_type_node, argtypes);
6098 acquire_fn = push_library_fn
6099 (acquire_fn, build_function_type (integer_type_node, argtypes));
6100 release_fn = push_library_fn (release_fn, vfntype);
6101 abort_fn = push_library_fn (abort_fn, vfntype);
6105 release_fn = identifier_global_value (release_fn);
6106 abort_fn = identifier_global_value (abort_fn);
6109 inner_if_stmt = begin_if_stmt ();
6110 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6113 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6114 begin = get_target_expr (boolean_false_node);
6115 flag = TARGET_EXPR_SLOT (begin);
6117 TARGET_EXPR_CLEANUP (begin)
6118 = build3 (COND_EXPR, void_type_node, flag,
6120 build_call_n (abort_fn, 1, guard_addr));
6121 CLEANUP_EH_ONLY (begin) = 1;
6123 /* Do the initialization itself. */
6124 init = add_stmt_to_compound (begin, init);
6125 init = add_stmt_to_compound
6126 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6127 init = add_stmt_to_compound
6128 (init, build_call_n (release_fn, 1, guard_addr));
6131 init = add_stmt_to_compound (init, set_guard (guard));
6133 /* Use atexit to register a function for destroying this static
6135 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6137 finish_expr_stmt (init);
6139 if (flag_threadsafe_statics)
6141 finish_compound_stmt (inner_then_clause);
6142 finish_then_clause (inner_if_stmt);
6143 finish_if_stmt (inner_if_stmt);
6146 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6148 finish_compound_stmt (then_clause);
6149 finish_then_clause (if_stmt);
6150 finish_if_stmt (if_stmt);
6154 static_aggregates = tree_cons (init, decl, static_aggregates);
6158 /* Make TYPE a complete type based on INITIAL_VALUE.
6159 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6160 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6161 3 if the initializer list is empty (in pedantic mode). */
6164 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6167 tree type, elt_type;
6171 unsigned HOST_WIDE_INT i;
6174 /* An array of character type can be initialized from a
6175 brace-enclosed string constant.
6177 FIXME: this code is duplicated from reshape_init. Probably
6178 we should just call reshape_init here? */
6179 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6180 && TREE_CODE (initial_value) == CONSTRUCTOR
6181 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6183 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6184 tree value = VEC_index (constructor_elt, v, 0)->value;
6186 if (TREE_CODE (value) == STRING_CST
6187 && VEC_length (constructor_elt, v) == 1)
6188 initial_value = value;
6191 /* If any of the elements are parameter packs, we can't actually
6192 complete this type now because the array size is dependent. */
6193 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6195 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6198 if (PACK_EXPANSION_P (value))
6204 failure = complete_array_type (ptype, initial_value, do_default);
6206 /* We can create the array before the element type is complete, which
6207 means that we didn't have these two bits set in the original type
6208 either. In completing the type, we are expected to propagate these
6209 bits. See also complete_type which does the same thing for arrays
6212 if (TYPE_DOMAIN (type))
6214 elt_type = TREE_TYPE (type);
6215 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6216 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6217 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6223 /* Return zero if something is declared to be a member of type
6224 CTYPE when in the context of CUR_TYPE. STRING is the error
6225 message to print in that case. Otherwise, quietly return 1. */
6228 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6230 if (ctype && ctype != cur_type)
6232 if (flags == DTOR_FLAG)
6233 error ("destructor for alien class %qT cannot be a member", ctype);
6235 error ("constructor for alien class %qT cannot be a member", ctype);
6241 /* Subroutine of `grokdeclarator'. */
6243 /* Generate errors possibly applicable for a given set of specifiers.
6244 This is for ARM $7.1.2. */
6247 bad_specifiers (tree object,
6256 error ("%qD declared as a %<virtual%> %s", object, type);
6258 error ("%qD declared as an %<inline%> %s", object, type);
6260 error ("%<const%> and %<volatile%> function specifiers on "
6261 "%qD invalid in %s declaration",
6264 error ("%q+D declared as a friend", object);
6266 && (TREE_CODE (object) == TYPE_DECL
6267 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6268 && !TYPE_REFFN_P (TREE_TYPE (object))
6269 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6270 error ("%q+D declared with an exception specification", object);
6273 /* DECL is a member function or static data member and is presently
6274 being defined. Check that the definition is taking place in a
6278 check_class_member_definition_namespace (tree decl)
6280 /* These checks only apply to member functions and static data
6282 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6283 || TREE_CODE (decl) == VAR_DECL);
6284 /* We check for problems with specializations in pt.c in
6285 check_specialization_namespace, where we can issue better
6287 if (processing_specialization)
6289 /* There are no restrictions on the placement of
6290 explicit instantiations. */
6291 if (processing_explicit_instantiation)
6295 A member function definition that appears outside of the
6296 class definition shall appear in a namespace scope enclosing
6297 the class definition.
6301 The definition for a static data member shall appear in a
6302 namespace scope enclosing the member's class definition. */
6303 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6304 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6305 decl, DECL_CONTEXT (decl));
6308 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6309 METHOD_TYPE for a non-static member function; QUALS are the
6310 cv-qualifiers that apply to the function. */
6313 build_this_parm (tree type, cp_cv_quals quals)
6318 cp_cv_quals this_quals;
6320 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6321 /* The `this' parameter is implicitly `const'; it cannot be
6323 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6324 qual_type = cp_build_qualified_type (this_type, this_quals);
6325 parm = build_artificial_parm (this_identifier, qual_type);
6326 cp_apply_type_quals_to_decl (this_quals, parm);
6330 /* CTYPE is class type, or null if non-class.
6331 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6333 DECLARATOR is the function's name.
6334 PARMS is a chain of PARM_DECLs for the function.
6335 VIRTUALP is truthvalue of whether the function is virtual or not.
6336 FLAGS are to be passed through to `grokclassfn'.
6337 QUALS are qualifiers indicating whether the function is `const'
6339 RAISES is a list of exceptions that this function can raise.
6340 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6341 not look, and -1 if we should not call `grokclassfn' at all.
6343 SFK is the kind of special function (if any) for the new function.
6345 Returns `NULL_TREE' if something goes wrong, after issuing
6346 applicable error messages. */
6349 grokfndecl (tree ctype,
6353 tree orig_declarator,
6355 enum overload_flags flags,
6362 special_function_kind sfk,
6369 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6373 type = build_exception_variant (type, raises);
6375 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6376 if (TREE_CODE (type) == METHOD_TYPE)
6379 parm = build_this_parm (type, quals);
6380 TREE_CHAIN (parm) = parms;
6383 DECL_ARGUMENTS (decl) = parms;
6384 /* Propagate volatile out from type to decl. */
6385 if (TYPE_VOLATILE (type))
6386 TREE_THIS_VOLATILE (decl) = 1;
6388 /* Setup decl according to sfk. */
6391 case sfk_constructor:
6392 case sfk_copy_constructor:
6393 DECL_CONSTRUCTOR_P (decl) = 1;
6395 case sfk_destructor:
6396 DECL_DESTRUCTOR_P (decl) = 1;
6402 /* If pointers to member functions use the least significant bit to
6403 indicate whether a function is virtual, ensure a pointer
6404 to this function will have that bit clear. */
6405 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6406 && TREE_CODE (type) == METHOD_TYPE
6407 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6408 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6411 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6415 ("defining explicit specialization %qD in friend declaration",
6419 tree fns = TREE_OPERAND (orig_declarator, 0);
6420 tree args = TREE_OPERAND (orig_declarator, 1);
6422 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6424 /* Something like `template <class T> friend void f<T>()'. */
6425 error ("invalid use of template-id %qD in declaration "
6426 "of primary template",
6432 /* A friend declaration of the form friend void f<>(). Record
6433 the information in the TEMPLATE_ID_EXPR. */
6434 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6436 if (TREE_CODE (fns) == COMPONENT_REF)
6438 /* Due to bison parser ickiness, we will have already looked
6439 up an operator_name or PFUNCNAME within the current class
6440 (see template_id in parse.y). If the current class contains
6441 such a name, we'll get a COMPONENT_REF here. Undo that. */
6443 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6444 == current_class_type);
6445 fns = TREE_OPERAND (fns, 1);
6447 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6448 || TREE_CODE (fns) == OVERLOAD);
6449 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6451 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6452 if (TREE_PURPOSE (t)
6453 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6455 error ("default arguments are not allowed in declaration "
6456 "of friend template specialization %qD",
6463 error ("%<inline%> is not allowed in declaration of friend "
6464 "template specialization %qD",
6471 /* If this decl has namespace scope, set that up. */
6473 set_decl_namespace (decl, in_namespace, friendp);
6475 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6477 /* `main' and builtins have implicit 'C' linkage. */
6478 if ((MAIN_NAME_P (declarator)
6479 || (IDENTIFIER_LENGTH (declarator) > 10
6480 && IDENTIFIER_POINTER (declarator)[0] == '_'
6481 && IDENTIFIER_POINTER (declarator)[1] == '_'
6482 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6483 && current_lang_name == lang_name_cplusplus
6484 && ctype == NULL_TREE
6485 /* NULL_TREE means global namespace. */
6486 && DECL_CONTEXT (decl) == NULL_TREE)
6487 SET_DECL_LANGUAGE (decl, lang_c);
6489 /* Should probably propagate const out from type to decl I bet (mrs). */
6492 DECL_STATIC_FUNCTION_P (decl) = 1;
6493 DECL_CONTEXT (decl) = ctype;
6498 DECL_CONTEXT (decl) = ctype;
6500 check_class_member_definition_namespace (decl);
6503 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6505 if (processing_template_decl)
6506 error ("cannot declare %<::main%> to be a template");
6508 error ("cannot declare %<::main%> to be inline");
6510 error ("cannot declare %<::main%> to be static");
6515 /* Members of anonymous types and local classes have no linkage; make
6516 them internal. If a typedef is made later, this will be changed. */
6517 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6518 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6523 /* [basic.link]: A name with no linkage (notably, the name of a class
6524 or enumeration declared in a local scope) shall not be used to
6525 declare an entity with linkage.
6527 Only check this for public decls for now. See core 319, 389. */
6528 t = no_linkage_check (TREE_TYPE (decl),
6529 /*relaxed_p=*/false);
6532 if (TYPE_ANONYMOUS_P (t))
6534 if (DECL_EXTERN_C_P (decl))
6535 /* Allow this; it's pretty common in C. */;
6538 pedwarn ("non-local function %q#D uses anonymous type",
6540 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6541 pedwarn ("%q+#D does not refer to the unqualified "
6542 "type, so it is not used for linkage",
6547 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6551 TREE_PUBLIC (decl) = publicp;
6554 DECL_INTERFACE_KNOWN (decl) = 1;
6555 DECL_NOT_REALLY_EXTERN (decl) = 1;
6558 /* If the declaration was declared inline, mark it as such. */
6560 DECL_DECLARED_INLINE_P (decl) = 1;
6561 /* We inline functions that are explicitly declared inline, or, when
6562 the user explicitly asks us to, all functions. */
6563 if (DECL_DECLARED_INLINE_P (decl)
6564 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6565 DECL_INLINE (decl) = 1;
6567 DECL_EXTERNAL (decl) = 1;
6568 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6571 ? G_("static member function %qD cannot have cv-qualifier")
6572 : G_("non-member function %qD cannot have cv-qualifier"),
6574 quals = TYPE_UNQUALIFIED;
6577 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6578 && !grok_op_properties (decl, /*complain=*/true))
6581 if (ctype && decl_function_context (decl))
6582 DECL_NO_STATIC_CHAIN (decl) = 1;
6585 /* Make the init_value nonzero so pushdecl knows this is not
6586 tentative. error_mark_node is replaced later with the BLOCK. */
6587 DECL_INITIAL (decl) = error_mark_node;
6589 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6590 TREE_NOTHROW (decl) = 1;
6592 /* Caller will do the rest of this. */
6596 if (ctype != NULL_TREE)
6597 grokclassfn (ctype, decl, flags);
6599 decl = check_explicit_specialization (orig_declarator, decl,
6602 4 * (friendp != 0));
6603 if (decl == error_mark_node)
6608 cplus_decl_attributes (&decl, *attrlist, 0);
6609 *attrlist = NULL_TREE;
6612 /* Check main's type after attributes have been applied. */
6613 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6615 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6618 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6620 error ("%<::main%> must return %<int%>");
6621 newtype = build_function_type (integer_type_node, oldtypeargs);
6622 TREE_TYPE (decl) = newtype;
6624 check_main_parameter_types (decl);
6627 if (ctype != NULL_TREE
6628 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6631 tree old_decl = check_classfn (ctype, decl,
6632 (processing_template_decl
6633 > template_class_depth (ctype))
6634 ? current_template_parms
6637 if (old_decl == error_mark_node)
6645 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6646 /* Because grokfndecl is always supposed to return a
6647 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6648 here. We depend on our callers to figure out that its
6649 really a template that's being returned. */
6650 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6652 if (DECL_STATIC_FUNCTION_P (old_decl)
6653 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6654 /* Remove the `this' parm added by grokclassfn.
6655 XXX Isn't this done in start_function, too? */
6656 revert_static_member_fn (decl);
6657 if (DECL_ARTIFICIAL (old_decl))
6659 error ("definition of implicitly-declared %qD", old_decl);
6663 /* Since we've smashed OLD_DECL to its
6664 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6665 if (TREE_CODE (decl) == TEMPLATE_DECL)
6666 decl = DECL_TEMPLATE_RESULT (decl);
6668 /* Attempt to merge the declarations. This can fail, in
6669 the case of some invalid specialization declarations. */
6670 pushed_scope = push_scope (ctype);
6671 ok = duplicate_decls (decl, old_decl, friendp);
6673 pop_scope (pushed_scope);
6676 error ("no %q#D member function declared in class %qT",
6684 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6687 if (ctype == NULL_TREE || check)
6691 DECL_VIRTUAL_P (decl) = 1;
6696 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6697 the linkage that DECL will receive in the object file. */
6700 set_linkage_for_static_data_member (tree decl)
6702 /* A static data member always has static storage duration and
6703 external linkage. Note that static data members are forbidden in
6704 local classes -- the only situation in which a class has
6705 non-external linkage. */
6706 TREE_PUBLIC (decl) = 1;
6707 TREE_STATIC (decl) = 1;
6708 /* For non-template classes, static data members are always put
6709 out in exactly those files where they are defined, just as
6710 with ordinary namespace-scope variables. */
6711 if (!processing_template_decl)
6712 DECL_INTERFACE_KNOWN (decl) = 1;
6715 /* Create a VAR_DECL named NAME with the indicated TYPE.
6717 If SCOPE is non-NULL, it is the class type or namespace containing
6718 the variable. If SCOPE is NULL, the variable should is created in
6719 the innermost enclosings scope. */
6722 grokvardecl (tree type,
6724 const cp_decl_specifier_seq *declspecs,
6730 tree explicit_scope;
6732 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6734 /* Compute the scope in which to place the variable, but remember
6735 whether or not that scope was explicitly specified by the user. */
6736 explicit_scope = scope;
6739 /* An explicit "extern" specifier indicates a namespace-scope
6741 if (declspecs->storage_class == sc_extern)
6742 scope = current_namespace;
6743 else if (!at_function_scope_p ())
6744 scope = current_scope ();
6748 && (/* If the variable is a namespace-scope variable declared in a
6749 template, we need DECL_LANG_SPECIFIC. */
6750 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6751 /* Similarly for namespace-scope variables with language linkage
6753 || (TREE_CODE (scope) == NAMESPACE_DECL
6754 && current_lang_name != lang_name_cplusplus)
6755 /* Similarly for static data members. */
6757 decl = build_lang_decl (VAR_DECL, name, type);
6759 decl = build_decl (VAR_DECL, name, type);
6761 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6762 set_decl_namespace (decl, explicit_scope, 0);
6764 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6766 if (declspecs->storage_class == sc_extern)
6768 DECL_THIS_EXTERN (decl) = 1;
6769 DECL_EXTERNAL (decl) = !initialized;
6772 if (DECL_CLASS_SCOPE_P (decl))
6774 set_linkage_for_static_data_member (decl);
6775 /* This function is only called with out-of-class definitions. */
6776 DECL_EXTERNAL (decl) = 0;
6777 check_class_member_definition_namespace (decl);
6779 /* At top level, either `static' or no s.c. makes a definition
6780 (perhaps tentative), and absence of `static' makes it public. */
6781 else if (toplevel_bindings_p ())
6783 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6784 && (DECL_THIS_EXTERN (decl) || ! constp));
6785 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6787 /* Not at top level, only `static' makes a static definition. */
6790 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6791 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6794 if (declspecs->specs[(int)ds_thread])
6795 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6797 if (TREE_PUBLIC (decl))
6799 /* [basic.link]: A name with no linkage (notably, the name of a class
6800 or enumeration declared in a local scope) shall not be used to
6801 declare an entity with linkage.
6803 Only check this for public decls for now. */
6804 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6807 if (TYPE_ANONYMOUS_P (t))
6809 if (DECL_EXTERN_C_P (decl))
6810 /* Allow this; it's pretty common in C. */
6814 /* DRs 132, 319 and 389 seem to indicate types with
6815 no linkage can only be used to declare extern "C"
6816 entities. Since it's not always an error in the
6817 ISO C++ 90 Standard, we only issue a warning. */
6818 warning (0, "non-local variable %q#D uses anonymous type",
6820 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6821 warning (0, "%q+#D does not refer to the unqualified "
6822 "type, so it is not used for linkage",
6827 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6831 DECL_INTERFACE_KNOWN (decl) = 1;
6836 /* Create and return a canonical pointer to member function type, for
6837 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6840 build_ptrmemfunc_type (tree type)
6844 tree unqualified_variant = NULL_TREE;
6846 if (type == error_mark_node)
6849 /* If a canonical type already exists for this type, use it. We use
6850 this method instead of type_hash_canon, because it only does a
6851 simple equality check on the list of field members. */
6853 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6856 /* Make sure that we always have the unqualified pointer-to-member
6858 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6860 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6862 t = make_aggr_type (RECORD_TYPE);
6863 xref_basetypes (t, NULL_TREE);
6865 /* Let the front end know this is a pointer to member function... */
6866 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6867 /* ... and not really an aggregate. */
6868 SET_IS_AGGR_TYPE (t, 0);
6870 field = build_decl (FIELD_DECL, pfn_identifier, type);
6873 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6874 TREE_CHAIN (field) = fields;
6877 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6879 /* Zap out the name so that the back end will give us the debugging
6880 information for this anonymous RECORD_TYPE. */
6881 TYPE_NAME (t) = NULL_TREE;
6883 /* If this is not the unqualified form of this pointer-to-member
6884 type, set the TYPE_MAIN_VARIANT for this type to be the
6885 unqualified type. Since they are actually RECORD_TYPEs that are
6886 not variants of each other, we must do this manually. */
6887 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6889 t = build_qualified_type (t, cp_type_quals (type));
6890 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6891 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6892 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6895 /* Cache this pointer-to-member type so that we can find it again
6897 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6899 /* Managing canonical types for the RECORD_TYPE behind a
6900 pointer-to-member function is a nightmare, so use structural
6901 equality for now. */
6902 SET_TYPE_STRUCTURAL_EQUALITY (t);
6907 /* Create and return a pointer to data member type. */
6910 build_ptrmem_type (tree class_type, tree member_type)
6912 if (TREE_CODE (member_type) == METHOD_TYPE)
6916 arg_types = TYPE_ARG_TYPES (member_type);
6917 class_type = (cp_build_qualified_type
6919 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6921 = build_method_type_directly (class_type,
6922 TREE_TYPE (member_type),
6923 TREE_CHAIN (arg_types));
6924 return build_ptrmemfunc_type (build_pointer_type (member_type));
6928 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6929 return build_offset_type (class_type, member_type);
6933 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6934 Check to see that the definition is valid. Issue appropriate error
6935 messages. Return 1 if the definition is particularly bad, or 0
6939 check_static_variable_definition (tree decl, tree type)
6941 /* Motion 10 at San Diego: If a static const integral data member is
6942 initialized with an integral constant expression, the initializer
6943 may appear either in the declaration (within the class), or in
6944 the definition, but not both. If it appears in the class, the
6945 member is a member constant. The file-scope definition is always
6947 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6949 error ("invalid in-class initialization of static data member "
6950 "of non-integral type %qT",
6952 /* If we just return the declaration, crashes will sometimes
6953 occur. We therefore return void_type_node, as if this were a
6954 friend declaration, to cause callers to completely ignore
6955 this declaration. */
6958 else if (!CP_TYPE_CONST_P (type))
6959 error ("ISO C++ forbids in-class initialization of non-const "
6960 "static member %qD",
6962 else if (pedantic && !INTEGRAL_TYPE_P (type))
6963 pedwarn ("ISO C++ forbids initialization of member constant "
6964 "%qD of non-integral type %qT", decl, type);
6969 /* Given the SIZE (i.e., number of elements) in an array, compute an
6970 appropriate index type for the array. If non-NULL, NAME is the
6971 name of the thing being declared. */
6974 compute_array_index_type (tree name, tree size)
6978 tree abi_1_itype = NULL_TREE;
6980 if (error_operand_p (size))
6981 return error_mark_node;
6983 type = TREE_TYPE (size);
6984 /* The array bound must be an integer type. */
6985 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6988 error ("size of array %qD has non-integral type %qT", name, type);
6990 error ("size of array has non-integral type %qT", type);
6991 size = integer_one_node;
6992 type = TREE_TYPE (size);
6995 if (value_dependent_expression_p (size))
6997 /* We cannot do any checking for a value-dependent SIZE. Just
6998 build the index type and mark that it requires structural
7000 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7001 size, integer_one_node));
7002 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7006 if (!abi_version_at_least (2) && processing_template_decl)
7007 /* For abi-1, we handled all instances in templates the same way,
7008 even when they were non-dependent. This effects the manglings
7009 produced. So, we do the normal checking for non-dependent
7010 sizes, but at the end we'll return the same type that abi-1
7011 would have, but with TYPE_CANONICAL set to the "right"
7012 value that the current ABI would provide. */
7013 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7014 size, integer_one_node));
7016 /* The size might be the result of a cast. */
7017 STRIP_TYPE_NOPS (size);
7019 /* It might be a const variable or enumeration constant. */
7020 size = integral_constant_value (size);
7022 /* Normally, the array-bound will be a constant. */
7023 if (TREE_CODE (size) == INTEGER_CST)
7025 /* Check to see if the array bound overflowed. Make that an
7026 error, no matter how generous we're being. */
7027 int old_flag_pedantic_errors = flag_pedantic_errors;
7028 int old_pedantic = pedantic;
7029 pedantic = flag_pedantic_errors = 1;
7030 constant_expression_warning (size);
7031 pedantic = old_pedantic;
7032 flag_pedantic_errors = old_flag_pedantic_errors;
7034 /* An array must have a positive number of elements. */
7035 if (INT_CST_LT (size, integer_zero_node))
7038 error ("size of array %qD is negative", name);
7040 error ("size of array is negative");
7041 size = integer_one_node;
7043 /* As an extension we allow zero-sized arrays. We always allow
7044 them in system headers because glibc uses them. */
7045 else if (integer_zerop (size) && pedantic && !in_system_header)
7048 pedwarn ("ISO C++ forbids zero-size array %qD", name);
7050 pedwarn ("ISO C++ forbids zero-size array");
7053 else if (TREE_CONSTANT (size))
7055 /* `(int) &fn' is not a valid array bound. */
7057 error ("size of array %qD is not an integral constant-expression",
7060 error ("size of array is not an integral constant-expression");
7061 size = integer_one_node;
7063 else if (pedantic && warn_vla != 0)
7066 pedwarn ("ISO C++ forbids variable length array %qD", name);
7068 pedwarn ("ISO C++ forbids variable length array");
7070 else if (warn_vla > 0)
7074 "variable length array %qD is used", name);
7077 "variable length array is used");
7080 if (processing_template_decl && !TREE_CONSTANT (size))
7081 /* A variable sized array. */
7082 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7085 HOST_WIDE_INT saved_processing_template_decl;
7087 /* Compute the index of the largest element in the array. It is
7088 one less than the number of elements in the array. We save
7089 and restore PROCESSING_TEMPLATE_DECL so that computations in
7090 cp_build_binary_op will be appropriately folded. */
7091 saved_processing_template_decl = processing_template_decl;
7092 processing_template_decl = 0;
7093 itype = cp_build_binary_op (MINUS_EXPR,
7094 cp_convert (ssizetype, size),
7095 cp_convert (ssizetype, integer_one_node));
7096 itype = fold (itype);
7097 processing_template_decl = saved_processing_template_decl;
7099 if (!TREE_CONSTANT (itype))
7100 /* A variable sized array. */
7101 itype = variable_size (itype);
7102 /* Make sure that there was no overflow when creating to a signed
7103 index type. (For example, on a 32-bit machine, an array with
7104 size 2^32 - 1 is too big.) */
7105 else if (TREE_CODE (itype) == INTEGER_CST
7106 && TREE_OVERFLOW (itype))
7108 error ("overflow in array dimension");
7109 TREE_OVERFLOW (itype) = 0;
7113 /* Create and return the appropriate index type. */
7116 tree t = build_index_type (itype);
7117 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7121 return build_index_type (itype);
7124 /* Returns the scope (if any) in which the entity declared by
7125 DECLARATOR will be located. If the entity was declared with an
7126 unqualified name, NULL_TREE is returned. */
7129 get_scope_of_declarator (const cp_declarator *declarator)
7131 while (declarator && declarator->kind != cdk_id)
7132 declarator = declarator->declarator;
7134 /* If the declarator-id is a SCOPE_REF, the scope in which the
7135 declaration occurs is the first operand. */
7137 && declarator->u.id.qualifying_scope)
7138 return declarator->u.id.qualifying_scope;
7140 /* Otherwise, the declarator is not a qualified name; the entity will
7141 be declared in the current scope. */
7145 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7146 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7150 create_array_type_for_decl (tree name, tree type, tree size)
7152 tree itype = NULL_TREE;
7153 const char* error_msg;
7155 /* If things have already gone awry, bail now. */
7156 if (type == error_mark_node || size == error_mark_node)
7157 return error_mark_node;
7159 /* Assume that everything will go OK. */
7162 /* There are some types which cannot be array elements. */
7163 switch (TREE_CODE (type))
7166 error_msg = "array of void";
7170 error_msg = "array of functions";
7173 case REFERENCE_TYPE:
7174 error_msg = "array of references";
7178 error_msg = "array of function members";
7185 /* If something went wrong, issue an error-message and return. */
7189 error ("declaration of %qD as %s", name, error_msg);
7191 error ("creating %s", error_msg);
7193 return error_mark_node;
7198 The constant expressions that specify the bounds of the arrays
7199 can be omitted only for the first member of the sequence. */
7200 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7203 error ("declaration of %qD as multidimensional array must "
7204 "have bounds for all dimensions except the first",
7207 error ("multidimensional array must have bounds for all "
7208 "dimensions except the first");
7210 return error_mark_node;
7213 /* Figure out the index type for the array. */
7215 itype = compute_array_index_type (name, size);
7218 T is called the array element type; this type shall not be [...] an
7219 abstract class type. */
7220 abstract_virtuals_error (name, type);
7222 return build_cplus_array_type (type, itype);
7225 /* Check that it's OK to declare a function with the indicated TYPE.
7226 SFK indicates the kind of special function (if any) that this
7227 function is. OPTYPE is the type given in a conversion operator
7228 declaration, or the class type for a constructor/destructor.
7229 Returns the actual return type of the function; that
7230 may be different than TYPE if an error occurs, or for certain
7231 special functions. */
7234 check_special_function_return_type (special_function_kind sfk,
7240 case sfk_constructor:
7242 error ("return type specification for constructor invalid");
7244 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7245 type = build_pointer_type (optype);
7247 type = void_type_node;
7250 case sfk_destructor:
7252 error ("return type specification for destructor invalid");
7253 /* We can't use the proper return type here because we run into
7254 problems with ambiguous bases and covariant returns.
7255 Java classes are left unchanged because (void *) isn't a valid
7256 Java type, and we don't want to change the Java ABI. */
7257 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7258 type = build_pointer_type (void_type_node);
7260 type = void_type_node;
7263 case sfk_conversion:
7265 error ("return type specified for %<operator %T%>", optype);
7276 /* A variable or data member (whose unqualified name is IDENTIFIER)
7277 has been declared with the indicated TYPE. If the TYPE is not
7278 acceptable, issue an error message and return a type to use for
7279 error-recovery purposes. */
7282 check_var_type (tree identifier, tree type)
7284 if (VOID_TYPE_P (type))
7287 error ("unnamed variable or field declared void");
7288 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7290 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7291 error ("variable or field %qE declared void", identifier);
7294 error ("variable or field declared void");
7295 type = error_mark_node;
7301 /* Given declspecs and a declarator (abstract or otherwise), determine
7302 the name and type of the object declared and construct a DECL node
7305 DECLSPECS points to the representation of declaration-specifier
7306 sequence that precedes declarator.
7308 DECL_CONTEXT says which syntactic context this declaration is in:
7309 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7310 FUNCDEF for a function definition. Like NORMAL but a few different
7311 error messages in each case. Return value may be zero meaning
7312 this definition is too screwy to try to parse.
7313 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7314 handle member functions (which have FIELD context).
7315 Return value may be zero meaning this definition is too screwy to
7317 PARM for a parameter declaration (either within a function prototype
7318 or before a function body). Make a PARM_DECL, or return void_type_node.
7319 CATCHPARM for a parameter declaration before a catch clause.
7320 TYPENAME if for a typename (in a cast or sizeof).
7321 Don't make a DECL node; just return the ..._TYPE node.
7322 FIELD for a struct or union field; make a FIELD_DECL.
7323 BITFIELD for a field with specified width.
7324 INITIALIZED is 1 if the decl has an initializer.
7326 ATTRLIST is a pointer to the list of attributes, which may be NULL
7327 if there are none; *ATTRLIST may be modified if attributes from inside
7328 the declarator should be applied to the declaration.
7330 When this function is called, scoping variables (such as
7331 CURRENT_CLASS_TYPE) should reflect the scope in which the
7332 declaration occurs, not the scope in which the new declaration will
7333 be placed. For example, on:
7337 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7340 Returns a DECL (if a declarator is present), a TYPE (if there is no
7341 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7345 grokdeclarator (const cp_declarator *declarator,
7346 const cp_decl_specifier_seq *declspecs,
7347 enum decl_context decl_context,
7351 tree type = NULL_TREE;
7353 int virtualp, explicitp, friendp, inlinep, staticp;
7354 int explicit_int = 0;
7355 int explicit_char = 0;
7356 int defaulted_int = 0;
7357 tree dependent_name = NULL_TREE;
7359 tree typedef_decl = NULL_TREE;
7360 const char *name = NULL;
7361 tree typedef_type = NULL_TREE;
7362 /* True if this declarator is a function definition. */
7363 bool funcdef_flag = false;
7364 cp_declarator_kind innermost_code = cdk_error;
7367 /* See the code below that used this. */
7368 tree decl_attr = NULL_TREE;
7371 /* Keep track of what sort of function is being processed
7372 so that we can warn about default return values, or explicit
7373 return values which do not match prescribed defaults. */
7374 special_function_kind sfk = sfk_none;
7376 tree dname = NULL_TREE;
7377 tree ctor_return_type = NULL_TREE;
7378 enum overload_flags flags = NO_SPECIAL;
7379 /* cv-qualifiers that apply to the declarator, for a declaration of
7380 a member function. */
7381 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7382 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7384 tree raises = NULL_TREE;
7385 int template_count = 0;
7386 tree returned_attrs = NULL_TREE;
7387 tree parms = NULL_TREE;
7388 const cp_declarator *id_declarator;
7389 /* The unqualified name of the declarator; either an
7390 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7391 tree unqualified_id;
7392 /* The class type, if any, in which this entity is located,
7393 or NULL_TREE if none. Note that this value may be different from
7394 the current class type; for example if an attempt is made to declare
7395 "A::f" inside "B", this value will be "A". */
7396 tree ctype = current_class_type;
7397 /* The NAMESPACE_DECL for the namespace in which this entity is
7398 located. If an unqualified name is used to declare the entity,
7399 this value will be NULL_TREE, even if the entity is located at
7401 tree in_namespace = NULL_TREE;
7402 cp_storage_class storage_class;
7403 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7404 bool type_was_error_mark_node = false;
7405 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7406 bool set_no_warning = false;
7408 signed_p = declspecs->specs[(int)ds_signed];
7409 unsigned_p = declspecs->specs[(int)ds_unsigned];
7410 short_p = declspecs->specs[(int)ds_short];
7411 long_p = declspecs->specs[(int)ds_long];
7412 longlong = declspecs->specs[(int)ds_long] >= 2;
7413 thread_p = declspecs->specs[(int)ds_thread];
7415 if (decl_context == FUNCDEF)
7416 funcdef_flag = true, decl_context = NORMAL;
7417 else if (decl_context == MEMFUNCDEF)
7418 funcdef_flag = true, decl_context = FIELD;
7419 else if (decl_context == BITFIELD)
7420 bitfield = 1, decl_context = FIELD;
7422 /* Look inside a declarator for the name being declared
7423 and get it as a string, for an error message. */
7424 for (id_declarator = declarator;
7426 id_declarator = id_declarator->declarator)
7428 if (id_declarator->kind != cdk_id)
7429 innermost_code = id_declarator->kind;
7431 switch (id_declarator->kind)
7434 if (id_declarator->declarator
7435 && id_declarator->declarator->kind == cdk_id)
7437 sfk = id_declarator->declarator->u.id.sfk;
7438 if (sfk == sfk_destructor)
7445 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7446 tree decl = id_declarator->u.id.unqualified_name;
7449 if (qualifying_scope)
7451 if (at_function_scope_p ())
7455 A declarator-id shall not be qualified except
7458 None of the cases are permitted in block
7460 if (qualifying_scope == global_namespace)
7461 error ("invalid use of qualified-name %<::%D%>",
7463 else if (TYPE_P (qualifying_scope))
7464 error ("invalid use of qualified-name %<%T::%D%>",
7465 qualifying_scope, decl);
7467 error ("invalid use of qualified-name %<%D::%D%>",
7468 qualifying_scope, decl);
7469 return error_mark_node;
7471 else if (TYPE_P (qualifying_scope))
7473 ctype = qualifying_scope;
7474 if (innermost_code != cdk_function
7475 && current_class_type
7476 && !UNIQUELY_DERIVED_FROM_P (ctype,
7477 current_class_type))
7479 error ("type %qT is not derived from type %qT",
7480 ctype, current_class_type);
7481 return error_mark_node;
7484 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7485 in_namespace = qualifying_scope;
7487 switch (TREE_CODE (decl))
7493 if (innermost_code != cdk_function)
7495 error ("declaration of %qD as non-function", decl);
7496 return error_mark_node;
7498 else if (!qualifying_scope
7499 && !(current_class_type && at_class_scope_p ()))
7501 error ("declaration of %qD as non-member", decl);
7502 return error_mark_node;
7505 type = TREE_OPERAND (decl, 0);
7506 name = IDENTIFIER_POINTER (constructor_name (type));
7511 case TEMPLATE_ID_EXPR:
7513 tree fns = TREE_OPERAND (decl, 0);
7516 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7518 gcc_assert (is_overloaded_fn (dname));
7519 dname = DECL_NAME (get_first_fn (dname));
7524 case IDENTIFIER_NODE:
7525 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7528 if (C_IS_RESERVED_WORD (dname))
7530 error ("declarator-id missing; using reserved word %qD",
7532 name = IDENTIFIER_POINTER (dname);
7534 else if (!IDENTIFIER_TYPENAME_P (dname))
7535 name = IDENTIFIER_POINTER (dname);
7538 gcc_assert (flags == NO_SPECIAL);
7539 flags = TYPENAME_FLAG;
7540 ctor_return_type = TREE_TYPE (dname);
7541 sfk = sfk_conversion;
7542 if (is_typename_at_global_scope (dname))
7543 name = IDENTIFIER_POINTER (dname);
7545 name = "<invalid operator>";
7562 return error_mark_node;
7567 if (id_declarator->kind == cdk_id)
7573 The declarator in a function-definition shall have the form
7574 D1 ( parameter-declaration-clause) ... */
7575 if (funcdef_flag && innermost_code != cdk_function)
7577 error ("function definition does not declare parameters");
7578 return error_mark_node;
7581 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7582 && innermost_code != cdk_function
7583 && ! (ctype && !declspecs->any_specifiers_p))
7585 error ("declaration of %qD as non-function", dname);
7586 return error_mark_node;
7589 /* Anything declared one level down from the top level
7590 must be one of the parameters of a function
7591 (because the body is at least two levels down). */
7593 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7594 by not allowing C++ class definitions to specify their parameters
7595 with xdecls (must be spec.d in the parmlist).
7597 Since we now wait to push a class scope until we are sure that
7598 we are in a legitimate method context, we must set oldcname
7599 explicitly (since current_class_name is not yet alive).
7601 We also want to avoid calling this a PARM if it is in a namespace. */
7603 if (decl_context == NORMAL && !toplevel_bindings_p ())
7605 struct cp_binding_level *b = current_binding_level;
7606 current_binding_level = b->level_chain;
7607 if (current_binding_level != 0 && toplevel_bindings_p ())
7608 decl_context = PARM;
7609 current_binding_level = b;
7613 name = decl_context == PARM ? "parameter" : "type name";
7615 /* If there were multiple types specified in the decl-specifier-seq,
7616 issue an error message. */
7617 if (declspecs->multiple_types_p)
7619 error ("two or more data types in declaration of %qs", name);
7620 return error_mark_node;
7623 if (declspecs->conflicting_specifiers_p)
7625 error ("conflicting specifiers in declaration of %qs", name);
7626 return error_mark_node;
7629 /* Extract the basic type from the decl-specifier-seq. */
7630 type = declspecs->type;
7631 if (type == error_mark_node)
7634 type_was_error_mark_node = true;
7636 /* If the entire declaration is itself tagged as deprecated then
7637 suppress reports of deprecated items. */
7638 if (type && TREE_DEPRECATED (type)
7639 && deprecated_state != DEPRECATED_SUPPRESS)
7640 warn_deprecated_use (type);
7641 if (type && TREE_CODE (type) == TYPE_DECL)
7643 typedef_decl = type;
7644 type = TREE_TYPE (typedef_decl);
7645 if (TREE_DEPRECATED (type)
7646 && DECL_ARTIFICIAL (typedef_decl)
7647 && deprecated_state != DEPRECATED_SUPPRESS)
7648 warn_deprecated_use (type);
7650 /* No type at all: default to `int', and set DEFAULTED_INT
7651 because it was not a user-defined typedef. */
7652 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7654 /* These imply 'int'. */
7655 type = integer_type_node;
7659 explicit_int = declspecs->explicit_int_p;
7660 explicit_char = declspecs->explicit_char_p;
7663 /* See the code below that used this. */
7665 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7667 typedef_type = type;
7670 if (sfk != sfk_conversion)
7671 ctor_return_type = ctype;
7673 if (sfk != sfk_none)
7674 type = check_special_function_return_type (sfk, type,
7676 else if (type == NULL_TREE)
7682 /* We handle `main' specially here, because 'main () { }' is so
7683 common. With no options, it is allowed. With -Wreturn-type,
7684 it is a warning. It is only an error with -pedantic-errors. */
7685 is_main = (funcdef_flag
7686 && dname && MAIN_NAME_P (dname)
7687 && ctype == NULL_TREE
7688 && in_namespace == NULL_TREE
7689 && current_namespace == global_namespace);
7691 if (type_was_error_mark_node)
7692 /* We've already issued an error, don't complain more. */;
7693 else if (in_system_header || flag_ms_extensions)
7694 /* Allow it, sigh. */;
7695 else if (pedantic || ! is_main)
7696 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7698 warning (OPT_Wreturn_type,
7699 "ISO C++ forbids declaration of %qs with no type", name);
7701 type = integer_type_node;
7706 /* Now process the modifiers that were specified
7707 and check for invalid combinations. */
7709 /* Long double is a special combination. */
7710 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7713 type = build_qualified_type (long_double_type_node,
7714 cp_type_quals (type));
7717 /* Check all other uses of type modifiers. */
7719 if (unsigned_p || signed_p || long_p || short_p)
7723 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7724 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7725 else if (signed_p && unsigned_p)
7726 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7727 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7728 error ("%<long long%> invalid for %qs", name);
7729 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7730 error ("%<long%> invalid for %qs", name);
7731 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7732 error ("%<short%> invalid for %qs", name);
7733 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7734 error ("%<long%> or %<short%> invalid for %qs", name);
7735 else if ((long_p || short_p) && explicit_char)
7736 error ("%<long%> or %<short%> specified with char for %qs", name);
7737 else if (long_p && short_p)
7738 error ("%<long%> and %<short%> specified together for %qs", name);
7742 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7744 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7746 if (flag_pedantic_errors)
7751 /* Discard the type modifiers if they are invalid. */
7762 /* Decide whether an integer type is signed or not.
7763 Optionally treat bitfields as signed by default. */
7767 It is implementation-defined whether a plain (neither
7768 explicitly signed or unsigned) char, short, int, or long
7769 bit-field is signed or unsigned.
7771 Naturally, we extend this to long long as well. Note that
7772 this does not include wchar_t. */
7773 || (bitfield && !flag_signed_bitfields
7775 /* A typedef for plain `int' without `signed' can be
7776 controlled just like plain `int', but a typedef for
7777 `signed int' cannot be so controlled. */
7779 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7780 && TREE_CODE (type) == INTEGER_TYPE
7781 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7784 type = long_long_unsigned_type_node;
7786 type = long_unsigned_type_node;
7788 type = short_unsigned_type_node;
7789 else if (type == char_type_node)
7790 type = unsigned_char_type_node;
7791 else if (typedef_decl)
7792 type = unsigned_type_for (type);
7794 type = unsigned_type_node;
7796 else if (signed_p && type == char_type_node)
7797 type = signed_char_type_node;
7799 type = long_long_integer_type_node;
7801 type = long_integer_type_node;
7803 type = short_integer_type_node;
7805 if (declspecs->specs[(int)ds_complex])
7807 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7808 error ("complex invalid for %qs", name);
7809 /* If we just have "complex", it is equivalent to
7810 "complex double", but if any modifiers at all are specified it is
7811 the complex form of TYPE. E.g, "complex short" is
7812 "complex short int". */
7814 else if (defaulted_int && ! longlong
7815 && ! (long_p || short_p || signed_p || unsigned_p))
7816 type = complex_double_type_node;
7817 else if (type == integer_type_node)
7818 type = complex_integer_type_node;
7819 else if (type == float_type_node)
7820 type = complex_float_type_node;
7821 else if (type == double_type_node)
7822 type = complex_double_type_node;
7823 else if (type == long_double_type_node)
7824 type = complex_long_double_type_node;
7826 type = build_complex_type (type);
7829 type_quals = TYPE_UNQUALIFIED;
7830 if (declspecs->specs[(int)ds_const])
7831 type_quals |= TYPE_QUAL_CONST;
7832 if (declspecs->specs[(int)ds_volatile])
7833 type_quals |= TYPE_QUAL_VOLATILE;
7834 if (declspecs->specs[(int)ds_restrict])
7835 type_quals |= TYPE_QUAL_RESTRICT;
7836 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7837 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7840 if (TREE_CODE (type) == FUNCTION_TYPE
7841 && type_quals != TYPE_UNQUALIFIED)
7843 /* This was an error in C++98 (cv-qualifiers cannot be added to
7844 a function type), but DR 295 makes the code well-formed by
7845 dropping the extra qualifiers. */
7848 tree bad_type = build_qualified_type (type, type_quals);
7849 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7852 type_quals = TYPE_UNQUALIFIED;
7854 type_quals |= cp_type_quals (type);
7855 type = cp_build_qualified_type_real
7856 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7857 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7858 /* We might have ignored or rejected some of the qualifiers. */
7859 type_quals = cp_type_quals (type);
7862 inlinep = !! declspecs->specs[(int)ds_inline];
7863 virtualp = !! declspecs->specs[(int)ds_virtual];
7864 explicitp = !! declspecs->specs[(int)ds_explicit];
7866 storage_class = declspecs->storage_class;
7867 if (storage_class == sc_static)
7868 staticp = 1 + (decl_context == FIELD);
7870 if (virtualp && staticp == 2)
7872 error ("member %qD cannot be declared both virtual and static", dname);
7873 storage_class = sc_none;
7876 friendp = !! declspecs->specs[(int)ds_friend];
7878 if (dependent_name && !friendp)
7880 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7881 return error_mark_node;
7884 /* Issue errors about use of storage classes for parameters. */
7885 if (decl_context == PARM)
7887 if (declspecs->specs[(int)ds_typedef])
7889 error ("typedef declaration invalid in parameter declaration");
7890 return error_mark_node;
7892 else if (storage_class == sc_static
7893 || storage_class == sc_extern
7895 error ("storage class specifiers invalid in parameter declarations");
7898 /* Give error if `virtual' is used outside of class declaration. */
7900 && (current_class_name == NULL_TREE || decl_context != FIELD))
7902 error ("virtual outside class declaration");
7906 /* Static anonymous unions are dealt with here. */
7907 if (staticp && decl_context == TYPENAME
7909 && ANON_AGGR_TYPE_P (declspecs->type))
7910 decl_context = FIELD;
7912 /* Warn about storage classes that are invalid for certain
7913 kinds of declarations (parameters, typenames, etc.). */
7916 && storage_class != sc_extern
7917 && storage_class != sc_static)
7918 || declspecs->specs[(int)ds_typedef]))
7920 error ("multiple storage classes in declaration of %qs", name);
7923 if (decl_context != NORMAL
7924 && ((storage_class != sc_none
7925 && storage_class != sc_mutable)
7928 if ((decl_context == PARM || decl_context == CATCHPARM)
7929 && (storage_class == sc_register
7930 || storage_class == sc_auto))
7932 else if (declspecs->specs[(int)ds_typedef])
7934 else if (decl_context == FIELD
7935 /* C++ allows static class elements. */
7936 && storage_class == sc_static)
7937 /* C++ also allows inlines and signed and unsigned elements,
7938 but in those cases we don't come in here. */
7942 if (decl_context == FIELD)
7943 error ("storage class specified for %qs", name);
7946 if (decl_context == PARM || decl_context == CATCHPARM)
7947 error ("storage class specified for parameter %qs", name);
7949 error ("storage class specified for typename");
7951 if (storage_class == sc_register
7952 || storage_class == sc_auto
7953 || storage_class == sc_extern
7955 storage_class = sc_none;
7958 else if (storage_class == sc_extern && initialized
7961 if (toplevel_bindings_p ())
7963 /* It's common practice (and completely valid) to have a const
7964 be initialized and declared extern. */
7965 if (!(type_quals & TYPE_QUAL_CONST))
7966 warning (0, "%qs initialized and declared %<extern%>", name);
7969 error ("%qs has both %<extern%> and initializer", name);
7971 else if (storage_class == sc_extern && funcdef_flag
7972 && ! toplevel_bindings_p ())
7973 error ("nested function %qs declared %<extern%>", name);
7974 else if (toplevel_bindings_p ())
7976 if (storage_class == sc_auto)
7977 error ("top-level declaration of %qs specifies %<auto%>", name);
7980 && storage_class != sc_extern
7981 && storage_class != sc_static)
7983 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7988 if (storage_class && friendp)
7989 error ("storage class specifiers invalid in friend function declarations");
7992 unqualified_id = NULL_TREE;
7995 unqualified_id = id_declarator->u.id.unqualified_name;
7996 switch (TREE_CODE (unqualified_id))
8000 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8003 case IDENTIFIER_NODE:
8004 case TEMPLATE_ID_EXPR:
8012 /* Determine the type of the entity declared by recurring on the
8014 for (; declarator; declarator = declarator->declarator)
8016 const cp_declarator *inner_declarator;
8019 if (type == error_mark_node)
8020 return error_mark_node;
8022 attrs = declarator->attributes;
8028 if (declarator == NULL || declarator->kind == cdk_id)
8029 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8030 if (declarator->kind == cdk_function)
8031 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8032 if (declarator->kind == cdk_array)
8033 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8034 returned_attrs = decl_attributes (&type,
8035 chainon (returned_attrs, attrs),
8039 if (declarator->kind == cdk_id)
8042 inner_declarator = declarator->declarator;
8044 switch (declarator->kind)
8047 type = create_array_type_for_decl (dname, type,
8048 declarator->u.array.bounds);
8056 /* Declaring a function type.
8057 Make sure we have a valid type for the function to return. */
8059 if (type_quals != TYPE_UNQUALIFIED)
8061 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8062 warning (OPT_Wignored_qualifiers,
8063 "type qualifiers ignored on function return type");
8064 /* We now know that the TYPE_QUALS don't apply to the
8065 decl, but to its return type. */
8066 type_quals = TYPE_UNQUALIFIED;
8067 set_no_warning = true;
8070 /* Warn about some types functions can't return. */
8072 if (TREE_CODE (type) == FUNCTION_TYPE)
8074 error ("%qs declared as function returning a function", name);
8075 type = integer_type_node;
8077 if (TREE_CODE (type) == ARRAY_TYPE)
8079 error ("%qs declared as function returning an array", name);
8080 type = integer_type_node;
8083 /* Pick up type qualifiers which should be applied to `this'. */
8084 memfn_quals = declarator->u.function.qualifiers;
8086 /* Pick up the exception specifications. */
8087 raises = declarator->u.function.exception_specification;
8089 /* Say it's a definition only for the CALL_EXPR
8090 closest to the identifier. */
8091 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8093 if (ctype == NULL_TREE
8094 && decl_context == FIELD
8096 && (friendp == 0 || dname == current_class_name))
8097 ctype = current_class_type;
8099 if (ctype && (sfk == sfk_constructor
8100 || sfk == sfk_destructor))
8102 /* We are within a class's scope. If our declarator name
8103 is the same as the class name, and we are defining
8104 a function, then it is a constructor/destructor, and
8105 therefore returns a void type. */
8107 /* ISO C++ 12.4/2. A destructor may not be declared
8108 const or volatile. A destructor may not be
8111 ISO C++ 12.1. A constructor may not be declared
8112 const or volatile. A constructor may not be
8113 virtual. A constructor may not be static. */
8115 error ((flags == DTOR_FLAG)
8116 ? "destructor cannot be static member function"
8117 : "constructor cannot be static member function");
8120 error ((flags == DTOR_FLAG)
8121 ? "destructors may not be cv-qualified"
8122 : "constructors may not be cv-qualified");
8123 memfn_quals = TYPE_UNQUALIFIED;
8126 if (decl_context == FIELD
8127 && !member_function_or_else (ctype,
8130 return error_mark_node;
8132 if (flags != DTOR_FLAG)
8134 /* It's a constructor. */
8139 pedwarn ("constructors cannot be declared virtual");
8142 if (decl_context == FIELD
8143 && sfk != sfk_constructor)
8144 return error_mark_node;
8146 if (decl_context == FIELD)
8152 error ("can't initialize friend function %qs", name);
8155 /* Cannot be both friend and virtual. */
8156 error ("virtual functions cannot be friends");
8159 if (decl_context == NORMAL)
8160 error ("friend declaration not in class definition");
8161 if (current_function_decl && funcdef_flag)
8162 error ("can't define friend function %qs in a local "
8167 arg_types = grokparms (declarator->u.function.parameters,
8170 if (inner_declarator
8171 && inner_declarator->kind == cdk_id
8172 && inner_declarator->u.id.sfk == sfk_destructor
8173 && arg_types != void_list_node)
8175 error ("destructors may not have parameters");
8176 arg_types = void_list_node;
8180 type = build_function_type (type, arg_types);
8187 /* Filter out pointers-to-references and references-to-references.
8188 We can get these if a TYPE_DECL is used. */
8190 if (TREE_CODE (type) == REFERENCE_TYPE)
8192 if (declarator->kind != cdk_reference)
8194 error ("cannot declare pointer to %q#T", type);
8195 type = TREE_TYPE (type);
8198 /* In C++0x, we allow reference to reference declarations
8199 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8200 and template type arguments [14.3.1/4 temp.arg.type]. The
8201 check for direct reference to reference declarations, which
8202 are still forbidden, occurs below. Reasoning behind the change
8203 can be found in DR106, DR540, and the rvalue reference
8205 else if (cxx_dialect == cxx98)
8207 error ("cannot declare reference to %q#T", type);
8208 type = TREE_TYPE (type);
8211 else if (VOID_TYPE_P (type))
8213 if (declarator->kind == cdk_reference)
8214 error ("cannot declare reference to %q#T", type);
8215 else if (declarator->kind == cdk_ptrmem)
8216 error ("cannot declare pointer to %q#T member", type);
8219 /* We now know that the TYPE_QUALS don't apply to the decl,
8220 but to the target of the pointer. */
8221 type_quals = TYPE_UNQUALIFIED;
8223 if (declarator->kind == cdk_ptrmem
8224 && (TREE_CODE (type) == FUNCTION_TYPE
8225 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8227 memfn_quals |= cp_type_quals (type);
8228 type = build_memfn_type (type,
8229 declarator->u.pointer.class_type,
8231 memfn_quals = TYPE_UNQUALIFIED;
8234 if (declarator->kind == cdk_reference)
8236 /* In C++0x, the type we are creating a reference to might be
8237 a typedef which is itself a reference type. In that case,
8238 we follow the reference collapsing rules in
8239 [7.1.3/8 dcl.typedef] to create the final reference type:
8241 "If a typedef TD names a type that is a reference to a type
8242 T, an attempt to create the type 'lvalue reference to cv TD'
8243 creates the type 'lvalue reference to T,' while an attempt
8244 to create the type "rvalue reference to cv TD' creates the
8247 if (!VOID_TYPE_P (type))
8248 type = cp_build_reference_type
8249 ((TREE_CODE (type) == REFERENCE_TYPE
8250 ? TREE_TYPE (type) : type),
8251 (declarator->u.reference.rvalue_ref
8252 && (TREE_CODE(type) != REFERENCE_TYPE
8253 || TYPE_REF_IS_RVALUE (type))));
8255 /* In C++0x, we need this check for direct reference to
8256 reference declarations, which are forbidden by
8257 [8.3.2/5 dcl.ref]. Reference to reference declarations
8258 are only allowed indirectly through typedefs and template
8259 type arguments. Example:
8261 void foo(int & &); // invalid ref-to-ref decl
8263 typedef int & int_ref;
8264 void foo(int_ref &); // valid ref-to-ref decl
8266 if (inner_declarator && inner_declarator->kind == cdk_reference)
8267 error ("cannot declare reference to %q#T, which is not "
8268 "a typedef or a template type argument", type);
8270 else if (TREE_CODE (type) == METHOD_TYPE)
8271 type = build_ptrmemfunc_type (build_pointer_type (type));
8272 else if (declarator->kind == cdk_ptrmem)
8274 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8276 if (declarator->u.pointer.class_type == error_mark_node)
8277 /* We will already have complained. */
8278 type = error_mark_node;
8280 type = build_ptrmem_type (declarator->u.pointer.class_type,
8284 type = build_pointer_type (type);
8286 /* Process a list of type modifier keywords (such as
8287 const or volatile) that were given inside the `*' or `&'. */
8289 if (declarator->u.pointer.qualifiers)
8292 = cp_build_qualified_type (type,
8293 declarator->u.pointer.qualifiers);
8294 type_quals = cp_type_quals (type);
8307 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8308 && TREE_CODE (type) != FUNCTION_TYPE
8309 && TREE_CODE (type) != METHOD_TYPE)
8311 error ("template-id %qD used as a declarator",
8313 unqualified_id = dname;
8316 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8317 qualified with a class-name, turn it into a METHOD_TYPE, unless
8318 we know that the function is static. We take advantage of this
8319 opportunity to do other processing that pertains to entities
8320 explicitly declared to be class members. Note that if DECLARATOR
8321 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8322 would not have exited the loop above. */
8324 && declarator->u.id.qualifying_scope
8325 && TYPE_P (declarator->u.id.qualifying_scope))
8329 ctype = declarator->u.id.qualifying_scope;
8330 ctype = TYPE_MAIN_VARIANT (ctype);
8332 while (t != NULL_TREE && CLASS_TYPE_P (t))
8334 /* You're supposed to have one `template <...>' for every
8335 template class, but you don't need one for a full
8336 specialization. For example:
8338 template <class T> struct S{};
8339 template <> struct S<int> { void f(); };
8340 void S<int>::f () {}
8342 is correct; there shouldn't be a `template <>' for the
8343 definition of `S<int>::f'. */
8344 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8345 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8346 /* T is an explicit (not partial) specialization. All
8347 containing classes must therefore also be explicitly
8350 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8351 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8352 template_count += 1;
8354 t = TYPE_MAIN_DECL (t);
8355 t = DECL_CONTEXT (t);
8358 if (ctype == current_class_type)
8362 pedwarn ("member functions are implicitly friends of their class");
8366 pedwarn ("extra qualification %<%T::%> on member %qs",
8369 else if (/* If the qualifying type is already complete, then we
8370 can skip the following checks. */
8371 !COMPLETE_TYPE_P (ctype)
8372 && (/* If the function is being defined, then
8373 qualifying type must certainly be complete. */
8375 /* A friend declaration of "T::f" is OK, even if
8376 "T" is a template parameter. But, if this
8377 function is not a friend, the qualifying type
8379 || (!friendp && !CLASS_TYPE_P (ctype))
8380 /* For a declaration, the type need not be
8381 complete, if either it is dependent (since there
8382 is no meaningful definition of complete in that
8383 case) or the qualifying class is currently being
8385 || !(dependent_type_p (ctype)
8386 || currently_open_class (ctype)))
8387 /* Check that the qualifying type is complete. */
8388 && !complete_type_or_else (ctype, NULL_TREE))
8389 return error_mark_node;
8390 else if (TREE_CODE (type) == FUNCTION_TYPE)
8392 tree sname = declarator->u.id.unqualified_name;
8394 if (current_class_type
8395 && (!friendp || funcdef_flag))
8398 ? "cannot define member function %<%T::%s%> within %<%T%>"
8399 : "cannot declare member function %<%T::%s%> within %<%T%>",
8400 ctype, name, current_class_type);
8401 return error_mark_node;
8404 if (TREE_CODE (sname) == IDENTIFIER_NODE
8405 && NEW_DELETE_OPNAME_P (sname))
8406 /* Overloaded operator new and operator delete
8407 are always static functions. */
8410 type = build_memfn_type (type, ctype, memfn_quals);
8412 else if (declspecs->specs[(int)ds_typedef]
8413 && current_class_type)
8415 error ("cannot declare member %<%T::%s%> within %qT",
8416 ctype, name, current_class_type);
8417 return error_mark_node;
8421 /* Now TYPE has the actual type. */
8426 *attrlist = chainon (returned_attrs, *attrlist);
8428 attrlist = &returned_attrs;
8431 /* Handle parameter packs. */
8432 if (parameter_pack_p)
8434 if (decl_context == PARM)
8435 /* Turn the type into a pack expansion.*/
8436 type = make_pack_expansion (type);
8438 error ("non-parameter %qs cannot be a parameter pack", name);
8441 /* Did array size calculations overflow? */
8443 if (TREE_CODE (type) == ARRAY_TYPE
8444 && COMPLETE_TYPE_P (type)
8445 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8446 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8448 error ("size of array %qs is too large", name);
8449 /* If we proceed with the array type as it is, we'll eventually
8450 crash in tree_low_cst(). */
8451 type = error_mark_node;
8454 if ((decl_context == FIELD || decl_context == PARM)
8455 && !processing_template_decl
8456 && variably_modified_type_p (type, NULL_TREE))
8458 if (decl_context == FIELD)
8459 error ("data member may not have variably modified type %qT", type);
8461 error ("parameter may not have variably modified type %qT", type);
8462 type = error_mark_node;
8465 if (explicitp == 1 || (explicitp && friendp))
8467 /* [dcl.fct.spec] The explicit specifier shall only be used in
8468 declarations of constructors within a class definition. */
8469 error ("only declarations of constructors can be %<explicit%>");
8473 if (storage_class == sc_mutable)
8475 if (decl_context != FIELD || friendp)
8477 error ("non-member %qs cannot be declared %<mutable%>", name);
8478 storage_class = sc_none;
8480 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8482 error ("non-object member %qs cannot be declared %<mutable%>", name);
8483 storage_class = sc_none;
8485 else if (TREE_CODE (type) == FUNCTION_TYPE
8486 || TREE_CODE (type) == METHOD_TYPE)
8488 error ("function %qs cannot be declared %<mutable%>", name);
8489 storage_class = sc_none;
8493 error ("static %qs cannot be declared %<mutable%>", name);
8494 storage_class = sc_none;
8496 else if (type_quals & TYPE_QUAL_CONST)
8498 error ("const %qs cannot be declared %<mutable%>", name);
8499 storage_class = sc_none;
8503 /* If this is declaring a typedef name, return a TYPE_DECL. */
8504 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8508 /* Note that the grammar rejects storage classes
8509 in typenames, fields or parameters. */
8510 if (current_lang_name == lang_name_java)
8511 TYPE_FOR_JAVA (type) = 1;
8513 /* This declaration:
8515 typedef void f(int) const;
8517 declares a function type which is not a member of any
8518 particular class, but which is cv-qualified; for
8519 example "f S::*" declares a pointer to a const-qualified
8520 member function of S. We record the cv-qualification in the
8522 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8524 type = cp_build_qualified_type (type, memfn_quals);
8526 /* We have now dealt with these qualifiers. */
8527 memfn_quals = TYPE_UNQUALIFIED;
8530 if (decl_context == FIELD)
8531 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8533 decl = build_decl (TYPE_DECL, unqualified_id, type);
8534 if (id_declarator && declarator->u.id.qualifying_scope)
8535 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8537 if (decl_context != FIELD)
8539 if (!current_function_decl)
8540 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8541 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8542 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8543 (current_function_decl)))
8544 /* The TYPE_DECL is "abstract" because there will be
8545 clones of this constructor/destructor, and there will
8546 be copies of this TYPE_DECL generated in those
8548 DECL_ABSTRACT (decl) = 1;
8550 else if (constructor_name_p (unqualified_id, current_class_type))
8551 pedwarn ("ISO C++ forbids nested type %qD with same name "
8552 "as enclosing class",
8555 /* If the user declares "typedef struct {...} foo" then the
8556 struct will have an anonymous name. Fill that name in now.
8557 Nothing can refer to it, so nothing needs know about the name
8559 if (type != error_mark_node
8562 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8563 && TYPE_ANONYMOUS_P (type)
8564 /* Don't do this if there are attributes. */
8565 && (!attrlist || !*attrlist)
8566 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8568 tree oldname = TYPE_NAME (type);
8571 /* Replace the anonymous name with the real name everywhere. */
8572 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8573 if (TYPE_NAME (t) == oldname)
8574 TYPE_NAME (t) = decl;
8576 if (TYPE_LANG_SPECIFIC (type))
8577 TYPE_WAS_ANONYMOUS (type) = 1;
8579 /* If this is a typedef within a template class, the nested
8580 type is a (non-primary) template. The name for the
8581 template needs updating as well. */
8582 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8583 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8584 = TYPE_IDENTIFIER (type);
8586 /* FIXME remangle member functions; member functions of a
8587 type with external linkage have external linkage. */
8591 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8592 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8594 bad_specifiers (decl, "type", virtualp,
8595 memfn_quals != TYPE_UNQUALIFIED,
8596 inlinep, friendp, raises != NULL_TREE);
8601 /* Detect the case of an array type of unspecified size
8602 which came, as such, direct from a typedef name.
8603 We must copy the type, so that the array's domain can be
8604 individually set by the object's initializer. */
8606 if (type && typedef_type
8607 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8608 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8609 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8611 /* Detect where we're using a typedef of function type to declare a
8612 function. PARMS will not be set, so we must create it now. */
8614 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8616 tree decls = NULL_TREE;
8619 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8621 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8623 TREE_CHAIN (decl) = decls;
8627 parms = nreverse (decls);
8629 if (decl_context != TYPENAME)
8631 /* A cv-qualifier-seq shall only be part of the function type
8632 for a non-static member function. [8.3.5/4 dcl.fct] */
8633 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8634 && (current_class_type == NULL_TREE || staticp) )
8637 ? G_("qualified function types cannot be used to "
8638 "declare static member functions")
8639 : G_("qualified function types cannot be used to "
8640 "declare free functions"));
8641 type = TYPE_MAIN_VARIANT (type);
8644 /* The qualifiers on the function type become the qualifiers on
8645 the non-static member function. */
8646 memfn_quals |= cp_type_quals (type);
8650 /* If this is a type name (such as, in a cast or sizeof),
8651 compute the type and return it now. */
8653 if (decl_context == TYPENAME)
8655 /* Note that the grammar rejects storage classes
8656 in typenames, fields or parameters. */
8657 if (type_quals != TYPE_UNQUALIFIED)
8658 type_quals = TYPE_UNQUALIFIED;
8660 /* Special case: "friend class foo" looks like a TYPENAME context. */
8663 if (type_quals != TYPE_UNQUALIFIED)
8665 error ("type qualifiers specified for friend class declaration");
8666 type_quals = TYPE_UNQUALIFIED;
8670 error ("%<inline%> specified for friend class declaration");
8676 /* Don't allow friend declaration without a class-key. */
8677 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8678 pedwarn ("template parameters cannot be friends");
8679 else if (TREE_CODE (type) == TYPENAME_TYPE)
8680 pedwarn ("friend declaration requires class-key, "
8681 "i.e. %<friend class %T::%D%>",
8682 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8684 pedwarn ("friend declaration requires class-key, "
8685 "i.e. %<friend %#T%>",
8689 /* Only try to do this stuff if we didn't already give up. */
8690 if (type != integer_type_node)
8692 /* A friendly class? */
8693 if (current_class_type)
8694 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8697 error ("trying to make class %qT a friend of global scope",
8700 type = void_type_node;
8703 else if (memfn_quals)
8705 if (ctype == NULL_TREE)
8707 if (TREE_CODE (type) != METHOD_TYPE)
8708 error ("invalid qualifiers on non-member function type");
8710 ctype = TYPE_METHOD_BASETYPE (type);
8713 type = build_memfn_type (type, ctype, memfn_quals);
8718 else if (unqualified_id == NULL_TREE && decl_context != PARM
8719 && decl_context != CATCHPARM
8720 && TREE_CODE (type) != UNION_TYPE
8723 error ("abstract declarator %qT used as declaration", type);
8724 return error_mark_node;
8727 /* Only functions may be declared using an operator-function-id. */
8729 && IDENTIFIER_OPNAME_P (unqualified_id)
8730 && TREE_CODE (type) != FUNCTION_TYPE
8731 && TREE_CODE (type) != METHOD_TYPE)
8733 error ("declaration of %qD as non-function", unqualified_id);
8734 return error_mark_node;
8737 /* We don't check parameter types here because we can emit a better
8738 error message later. */
8739 if (decl_context != PARM)
8741 type = check_var_type (unqualified_id, type);
8742 if (type == error_mark_node)
8743 return error_mark_node;
8746 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8747 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8749 if (decl_context == PARM || decl_context == CATCHPARM)
8751 if (ctype || in_namespace)
8752 error ("cannot use %<::%> in parameter declaration");
8754 /* A parameter declared as an array of T is really a pointer to T.
8755 One declared as a function is really a pointer to a function.
8756 One declared as a member is really a pointer to member. */
8758 if (TREE_CODE (type) == ARRAY_TYPE)
8760 /* Transfer const-ness of array into that of type pointed to. */
8761 type = build_pointer_type (TREE_TYPE (type));
8762 type_quals = TYPE_UNQUALIFIED;
8764 else if (TREE_CODE (type) == FUNCTION_TYPE)
8765 type = build_pointer_type (type);
8771 if (decl_context == PARM)
8773 decl = cp_build_parm_decl (unqualified_id, type);
8775 bad_specifiers (decl, "parameter", virtualp,
8776 memfn_quals != TYPE_UNQUALIFIED,
8777 inlinep, friendp, raises != NULL_TREE);
8779 else if (decl_context == FIELD)
8781 /* The C99 flexible array extension. */
8782 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8783 && TYPE_DOMAIN (type) == NULL_TREE)
8785 tree itype = compute_array_index_type (dname, integer_zero_node);
8786 type = build_cplus_array_type (TREE_TYPE (type), itype);
8789 if (type == error_mark_node)
8791 /* Happens when declaring arrays of sizes which
8792 are error_mark_node, for example. */
8795 else if (in_namespace && !friendp)
8797 /* Something like struct S { int N::j; }; */
8798 error ("invalid use of %<::%>");
8799 return error_mark_node;
8801 else if (TREE_CODE (type) == FUNCTION_TYPE)
8804 tree function_context;
8808 if (ctype == NULL_TREE)
8809 ctype = current_class_type;
8811 if (ctype == NULL_TREE)
8813 error ("can't make %qD into a method -- not in a class",
8815 return error_mark_node;
8818 /* ``A union may [ ... ] not [ have ] virtual functions.''
8820 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8822 error ("function %qD declared virtual inside a union",
8824 return error_mark_node;
8827 if (NEW_DELETE_OPNAME_P (unqualified_id))
8831 error ("%qD cannot be declared virtual, since it "
8837 else if (staticp < 2)
8838 type = build_memfn_type (type, ctype, memfn_quals);
8841 /* Check that the name used for a destructor makes sense. */
8842 if (sfk == sfk_destructor)
8846 gcc_assert (friendp);
8847 error ("expected qualified name in friend declaration "
8848 "for destructor %qD",
8849 id_declarator->u.id.unqualified_name);
8850 return error_mark_node;
8853 if (!same_type_p (TREE_OPERAND
8854 (id_declarator->u.id.unqualified_name, 0),
8857 error ("declaration of %qD as member of %qT",
8858 id_declarator->u.id.unqualified_name, ctype);
8859 return error_mark_node;
8862 else if (sfk == sfk_constructor && friendp)
8864 error ("expected qualified name in friend declaration "
8865 "for constructor %qD",
8866 id_declarator->u.id.unqualified_name);
8867 return error_mark_node;
8870 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8871 function_context = (ctype != NULL_TREE) ?
8872 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8873 publicp = (! friendp || ! staticp)
8874 && function_context == NULL_TREE;
8875 decl = grokfndecl (ctype, type,
8876 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8877 ? unqualified_id : dname,
8880 virtualp, flags, memfn_quals, raises,
8881 friendp ? -1 : 0, friendp, publicp, inlinep,
8883 funcdef_flag, template_count, in_namespace, attrlist);
8884 if (decl == NULL_TREE)
8885 return error_mark_node;
8887 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8888 /* The decl and setting of decl_attr is also turned off. */
8889 decl = build_decl_attribute_variant (decl, decl_attr);
8892 /* [class.conv.ctor]
8894 A constructor declared without the function-specifier
8895 explicit that can be called with a single parameter
8896 specifies a conversion from the type of its first
8897 parameter to the type of its class. Such a constructor
8898 is called a converting constructor. */
8900 DECL_NONCONVERTING_P (decl) = 1;
8901 else if (DECL_CONSTRUCTOR_P (decl))
8903 /* The constructor can be called with exactly one
8904 parameter if there is at least one parameter, and
8905 any subsequent parameters have default arguments.
8906 Ignore any compiler-added parms. */
8907 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8909 if (arg_types == void_list_node
8911 && TREE_CHAIN (arg_types)
8912 && TREE_CHAIN (arg_types) != void_list_node
8913 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8914 DECL_NONCONVERTING_P (decl) = 1;
8917 else if (TREE_CODE (type) == METHOD_TYPE)
8919 /* We only get here for friend declarations of
8920 members of other classes. */
8921 /* All method decls are public, so tell grokfndecl to set
8922 TREE_PUBLIC, also. */
8923 decl = grokfndecl (ctype, type,
8924 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8925 ? unqualified_id : dname,
8928 virtualp, flags, memfn_quals, raises,
8929 friendp ? -1 : 0, friendp, 1, 0, sfk,
8930 funcdef_flag, template_count, in_namespace,
8932 if (decl == NULL_TREE)
8933 return error_mark_node;
8935 else if (!staticp && !dependent_type_p (type)
8936 && !COMPLETE_TYPE_P (complete_type (type))
8937 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8940 error ("field %qD has incomplete type", unqualified_id);
8942 error ("name %qT has incomplete type", type);
8944 /* If we're instantiating a template, tell them which
8945 instantiation made the field's type be incomplete. */
8946 if (current_class_type
8947 && TYPE_NAME (current_class_type)
8948 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8950 && declspecs->type == type)
8951 error (" in instantiation of template %qT",
8952 current_class_type);
8954 return error_mark_node;
8960 error ("%qE is neither function nor member function; "
8961 "cannot be declared friend", unqualified_id);
8969 /* Friends are treated specially. */
8970 if (ctype == current_class_type)
8971 ; /* We already issued a pedwarn. */
8972 else if (decl && DECL_NAME (decl))
8974 if (template_class_depth (current_class_type) == 0)
8976 decl = check_explicit_specialization
8977 (unqualified_id, decl, template_count,
8978 2 * funcdef_flag + 4);
8979 if (decl == error_mark_node)
8980 return error_mark_node;
8983 decl = do_friend (ctype, unqualified_id, decl,
8989 return error_mark_node;
8992 /* Structure field. It may not be a function, except for C++. */
8994 if (decl == NULL_TREE)
9000 /* An attempt is being made to initialize a non-static
9001 member. But, from [class.mem]:
9003 4 A member-declarator can contain a
9004 constant-initializer only if it declares a static
9005 member (_class.static_) of integral or enumeration
9006 type, see _class.static.data_.
9008 This used to be relatively common practice, but
9009 the rest of the compiler does not correctly
9010 handle the initialization unless the member is
9011 static so we make it static below. */
9012 pedwarn ("ISO C++ forbids initialization of member %qD",
9014 pedwarn ("making %qD static", unqualified_id);
9018 if (uses_template_parms (type))
9019 /* We'll check at instantiation time. */
9021 else if (check_static_variable_definition (unqualified_id,
9023 /* If we just return the declaration, crashes
9024 will sometimes occur. We therefore return
9025 void_type_node, as if this was a friend
9026 declaration, to cause callers to completely
9027 ignore this declaration. */
9028 return error_mark_node;
9033 /* C++ allows static class members. All other work
9034 for this is done by grokfield. */
9035 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9036 set_linkage_for_static_data_member (decl);
9037 /* Even if there is an in-class initialization, DECL
9038 is considered undefined until an out-of-class
9039 definition is provided. */
9040 DECL_EXTERNAL (decl) = 1;
9043 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9047 decl = build_decl (FIELD_DECL, unqualified_id, type);
9048 DECL_NONADDRESSABLE_P (decl) = bitfield;
9049 if (bitfield && !unqualified_id)
9050 TREE_NO_WARNING (decl) = 1;
9052 if (storage_class == sc_mutable)
9054 DECL_MUTABLE_P (decl) = 1;
9055 storage_class = sc_none;
9059 bad_specifiers (decl, "field", virtualp,
9060 memfn_quals != TYPE_UNQUALIFIED,
9061 inlinep, friendp, raises != NULL_TREE);
9064 else if (TREE_CODE (type) == FUNCTION_TYPE
9065 || TREE_CODE (type) == METHOD_TYPE)
9070 if (!unqualified_id)
9071 return error_mark_node;
9073 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9074 original_name = dname;
9076 original_name = unqualified_id;
9078 if (storage_class == sc_auto)
9079 error ("storage class %<auto%> invalid for function %qs", name);
9080 else if (storage_class == sc_register)
9081 error ("storage class %<register%> invalid for function %qs", name);
9083 error ("storage class %<__thread%> invalid for function %qs", name);
9085 /* Function declaration not at top level.
9086 Storage classes other than `extern' are not allowed
9087 and `extern' makes no difference. */
9088 if (! toplevel_bindings_p ()
9089 && (storage_class == sc_static
9090 || declspecs->specs[(int)ds_inline])
9093 if (storage_class == sc_static)
9094 pedwarn ("%<static%> specified invalid for function %qs "
9095 "declared out of global scope", name);
9097 pedwarn ("%<inline%> specifier invalid for function %qs "
9098 "declared out of global scope", name);
9101 if (ctype == NULL_TREE)
9105 error ("virtual non-class function %qs", name);
9109 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9110 && !NEW_DELETE_OPNAME_P (original_name))
9111 type = build_method_type_directly (ctype,
9113 TYPE_ARG_TYPES (type));
9115 /* Record presence of `static'. */
9116 publicp = (ctype != NULL_TREE
9117 || storage_class == sc_extern
9118 || storage_class != sc_static);
9120 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9121 virtualp, flags, memfn_quals, raises,
9123 publicp, inlinep, sfk, funcdef_flag,
9124 template_count, in_namespace, attrlist);
9125 if (decl == NULL_TREE)
9126 return error_mark_node;
9130 int invalid_static = 0;
9132 /* Don't allow a static member function in a class, and forbid
9133 declaring main to be static. */
9134 if (TREE_CODE (type) == METHOD_TYPE)
9136 pedwarn ("cannot declare member function %qD to have "
9137 "static linkage", decl);
9140 else if (current_function_decl)
9142 /* FIXME need arm citation */
9143 error ("cannot declare static function inside another function");
9150 storage_class = sc_none;
9156 /* It's a variable. */
9158 /* An uninitialized decl with `extern' is a reference. */
9159 decl = grokvardecl (type, unqualified_id,
9162 (type_quals & TYPE_QUAL_CONST) != 0,
9163 ctype ? ctype : in_namespace);
9164 bad_specifiers (decl, "variable", virtualp,
9165 memfn_quals != TYPE_UNQUALIFIED,
9166 inlinep, friendp, raises != NULL_TREE);
9170 DECL_CONTEXT (decl) = ctype;
9173 pedwarn ("%<static%> may not be used when defining "
9174 "(as opposed to declaring) a static data member");
9176 storage_class = sc_none;
9178 if (storage_class == sc_register && TREE_STATIC (decl))
9180 error ("static member %qD declared %<register%>", decl);
9181 storage_class = sc_none;
9183 if (storage_class == sc_extern && pedantic)
9185 pedwarn ("cannot explicitly declare member %q#D to have "
9188 storage_class = sc_none;
9193 /* Record `register' declaration for warnings on &
9194 and in case doing stupid register allocation. */
9196 if (storage_class == sc_register)
9197 DECL_REGISTER (decl) = 1;
9198 else if (storage_class == sc_extern)
9199 DECL_THIS_EXTERN (decl) = 1;
9200 else if (storage_class == sc_static)
9201 DECL_THIS_STATIC (decl) = 1;
9203 /* Record constancy and volatility on the DECL itself . There's
9204 no need to do this when processing a template; we'll do this
9205 for the instantiated declaration based on the type of DECL. */
9206 if (!processing_template_decl)
9207 cp_apply_type_quals_to_decl (type_quals, decl);
9210 TREE_NO_WARNING (decl) = 1;
9216 /* Subroutine of start_function. Ensure that each of the parameter
9217 types (as listed in PARMS) is complete, as is required for a
9218 function definition. */
9221 require_complete_types_for_parms (tree parms)
9223 for (; parms; parms = TREE_CHAIN (parms))
9225 if (dependent_type_p (TREE_TYPE (parms)))
9227 if (!VOID_TYPE_P (TREE_TYPE (parms))
9228 && complete_type_or_else (TREE_TYPE (parms), parms))
9230 relayout_decl (parms);
9231 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9234 /* grokparms or complete_type_or_else will have already issued
9236 TREE_TYPE (parms) = error_mark_node;
9240 /* Returns nonzero if T is a local variable. */
9243 local_variable_p (const_tree t)
9245 if ((TREE_CODE (t) == VAR_DECL
9246 /* A VAR_DECL with a context that is a _TYPE is a static data
9248 && !TYPE_P (CP_DECL_CONTEXT (t))
9249 /* Any other non-local variable must be at namespace scope. */
9250 && !DECL_NAMESPACE_SCOPE_P (t))
9251 || (TREE_CODE (t) == PARM_DECL))
9257 /* Like local_variable_p, but suitable for use as a tree-walking
9261 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9262 void *data ATTRIBUTE_UNUSED)
9264 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9266 else if (TYPE_P (*tp))
9273 /* Check that ARG, which is a default-argument expression for a
9274 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9275 something goes wrong. DECL may also be a _TYPE node, rather than a
9276 DECL, if there is no DECL available. */
9279 check_default_argument (tree decl, tree arg)
9284 if (TREE_CODE (arg) == DEFAULT_ARG)
9285 /* We get a DEFAULT_ARG when looking at an in-class declaration
9286 with a default argument. Ignore the argument for now; we'll
9287 deal with it after the class is complete. */
9296 decl_type = TREE_TYPE (decl);
9298 if (arg == error_mark_node
9299 || decl == error_mark_node
9300 || TREE_TYPE (arg) == error_mark_node
9301 || decl_type == error_mark_node)
9302 /* Something already went wrong. There's no need to check
9304 return error_mark_node;
9306 /* [dcl.fct.default]
9308 A default argument expression is implicitly converted to the
9310 if (!TREE_TYPE (arg)
9311 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9314 error ("default argument for %q#D has type %qT",
9315 decl, TREE_TYPE (arg));
9317 error ("default argument for parameter of type %qT has type %qT",
9318 decl_type, TREE_TYPE (arg));
9320 return error_mark_node;
9323 /* [dcl.fct.default]
9325 Local variables shall not be used in default argument
9328 The keyword `this' shall not be used in a default argument of a
9330 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9333 error ("default argument %qE uses local variable %qD", arg, var);
9334 return error_mark_node;
9341 /* Decode the list of parameter types for a function type.
9342 Given the list of things declared inside the parens,
9343 return a list of types.
9345 If this parameter does not end with an ellipsis, we append
9348 *PARMS is set to the chain of PARM_DECLs created. */
9351 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9353 tree result = NULL_TREE;
9354 tree decls = NULL_TREE;
9355 int ellipsis = !first_parm || first_parm->ellipsis_p;
9356 cp_parameter_declarator *parm;
9358 struct pointer_set_t *unique_decls = pointer_set_create ();
9360 for (parm = first_parm; parm != NULL; parm = parm->next)
9362 tree type = NULL_TREE;
9363 tree init = parm->default_argument;
9367 if (parm == no_parameters)
9370 attrs = parm->decl_specifiers.attributes;
9371 parm->decl_specifiers.attributes = NULL_TREE;
9372 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9373 PARM, init != NULL_TREE, &attrs);
9374 if (! decl || TREE_TYPE (decl) == error_mark_node)
9378 cplus_decl_attributes (&decl, attrs, 0);
9380 type = TREE_TYPE (decl);
9381 if (VOID_TYPE_P (type))
9383 if (same_type_p (type, void_type_node)
9384 && DECL_SELF_REFERENCE_P (type)
9385 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9386 /* this is a parmlist of `(void)', which is ok. */
9388 cxx_incomplete_type_error (decl, type);
9389 /* It's not a good idea to actually create parameters of
9390 type `void'; other parts of the compiler assume that a
9391 void type terminates the parameter list. */
9392 type = error_mark_node;
9393 TREE_TYPE (decl) = error_mark_node;
9396 if (type != error_mark_node
9397 && TYPE_FOR_JAVA (type)
9398 && IS_AGGR_TYPE (type))
9400 error ("parameter %qD has Java class type", decl);
9401 type = error_mark_node;
9402 TREE_TYPE (decl) = error_mark_node;
9406 if (type != error_mark_node)
9408 /* Top-level qualifiers on the parameters are
9409 ignored for function types. */
9410 type = cp_build_qualified_type (type, 0);
9411 if (TREE_CODE (type) == METHOD_TYPE)
9413 error ("parameter %qD invalidly declared method type", decl);
9414 type = build_pointer_type (type);
9415 TREE_TYPE (decl) = type;
9417 else if (abstract_virtuals_error (decl, type))
9418 any_error = 1; /* Seems like a good idea. */
9419 else if (POINTER_TYPE_P (type))
9421 /* [dcl.fct]/6, parameter types cannot contain pointers
9422 (references) to arrays of unknown bound. */
9423 tree t = TREE_TYPE (type);
9424 int ptr = TYPE_PTR_P (type);
9430 else if (TREE_CODE (t) != ARRAY_TYPE)
9432 else if (!TYPE_DOMAIN (t))
9436 if (TREE_CODE (t) == ARRAY_TYPE)
9437 error ("parameter %qD includes %s to array of unknown "
9439 decl, ptr ? "pointer" : "reference", t);
9444 else if (init && !processing_template_decl)
9445 init = check_default_argument (decl, init);
9448 if (TREE_CODE (decl) == PARM_DECL
9449 && FUNCTION_PARAMETER_PACK_P (decl)
9451 error ("parameter packs must be at the end of the parameter list");
9453 if (DECL_NAME (decl))
9455 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9456 error ("multiple parameters named %qE", DECL_NAME (decl));
9458 pointer_set_insert (unique_decls, DECL_NAME (decl));
9461 TREE_CHAIN (decl) = decls;
9463 result = tree_cons (init, type, result);
9465 decls = nreverse (decls);
9466 result = nreverse (result);
9468 result = chainon (result, void_list_node);
9471 pointer_set_destroy (unique_decls);
9476 /* D is a constructor or overloaded `operator='.
9478 Let T be the class in which D is declared. Then, this function
9481 -1 if D's is an ill-formed constructor or copy assignment operator
9482 whose first parameter is of type `T'.
9483 0 if D is not a copy constructor or copy assignment
9485 1 if D is a copy constructor or copy assignment operator whose
9486 first parameter is a reference to const qualified T.
9487 2 if D is a copy constructor or copy assignment operator whose
9488 first parameter is a reference to non-const qualified T.
9490 This function can be used as a predicate. Positive values indicate
9491 a copy constructor and nonzero values indicate a copy assignment
9495 copy_fn_p (const_tree d)
9501 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9503 if (TREE_CODE (d) == TEMPLATE_DECL
9504 || (DECL_TEMPLATE_INFO (d)
9505 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9506 /* Instantiations of template member functions are never copy
9507 functions. Note that member functions of templated classes are
9508 represented as template functions internally, and we must
9509 accept those as copy functions. */
9512 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9516 arg_type = TREE_VALUE (args);
9517 if (arg_type == error_mark_node)
9520 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9522 /* Pass by value copy assignment operator. */
9525 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9526 && !TYPE_REF_IS_RVALUE (arg_type)
9527 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9529 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9535 args = TREE_CHAIN (args);
9537 if (args && args != void_list_node && !TREE_PURPOSE (args))
9538 /* There are more non-optional args. */
9544 /* D is a constructor or overloaded `operator='.
9546 Let T be the class in which D is declared. Then, this function
9547 returns true when D is a move constructor or move assignment
9548 operator, false otherwise. */
9551 move_fn_p (const_tree d)
9555 bool result = false;
9557 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9559 if (cxx_dialect == cxx98)
9560 /* There are no move constructors if we are in C++98 mode. */
9563 if (TREE_CODE (d) == TEMPLATE_DECL
9564 || (DECL_TEMPLATE_INFO (d)
9565 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9566 /* Instantiations of template member functions are never copy
9567 functions. Note that member functions of templated classes are
9568 represented as template functions internally, and we must
9569 accept those as copy functions. */
9572 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9576 arg_type = TREE_VALUE (args);
9577 if (arg_type == error_mark_node)
9580 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9581 && TYPE_REF_IS_RVALUE (arg_type)
9582 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9586 args = TREE_CHAIN (args);
9588 if (args && args != void_list_node && !TREE_PURPOSE (args))
9589 /* There are more non-optional args. */
9595 /* Remember any special properties of member function DECL. */
9598 grok_special_member_properties (tree decl)
9602 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9605 class_type = DECL_CONTEXT (decl);
9606 if (DECL_CONSTRUCTOR_P (decl))
9608 int ctor = copy_fn_p (decl);
9610 if (!DECL_ARTIFICIAL (decl))
9611 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9617 A non-template constructor for class X is a copy
9618 constructor if its first parameter is of type X&, const
9619 X&, volatile X& or const volatile X&, and either there
9620 are no other parameters or else all other parameters have
9621 default arguments. */
9622 TYPE_HAS_INIT_REF (class_type) = 1;
9624 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9626 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9627 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9629 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9633 A non-template assignment operator for class X is a copy
9634 assignment operator if its parameter is of type X, X&, const
9635 X&, volatile X& or const volatile X&. */
9637 int assop = copy_fn_p (decl);
9641 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9643 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9648 /* Check a constructor DECL has the correct form. Complains
9649 if the class has a constructor of the form X(X). */
9652 grok_ctor_properties (const_tree ctype, const_tree decl)
9654 int ctor_parm = copy_fn_p (decl);
9660 A declaration of a constructor for a class X is ill-formed if
9661 its first parameter is of type (optionally cv-qualified) X
9662 and either there are no other parameters or else all other
9663 parameters have default arguments.
9665 We *don't* complain about member template instantiations that
9666 have this form, though; they can occur as we try to decide
9667 what constructor to use during overload resolution. Since
9668 overload resolution will never prefer such a constructor to
9669 the non-template copy constructor (which is either explicitly
9670 or implicitly defined), there's no need to worry about their
9671 existence. Theoretically, they should never even be
9672 instantiated, but that's hard to forestall. */
9673 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9681 /* An operator with this code is unary, but can also be binary. */
9684 ambi_op_p (enum tree_code code)
9686 return (code == INDIRECT_REF
9687 || code == ADDR_EXPR
9688 || code == UNARY_PLUS_EXPR
9689 || code == NEGATE_EXPR
9690 || code == PREINCREMENT_EXPR
9691 || code == PREDECREMENT_EXPR);
9694 /* An operator with this name can only be unary. */
9697 unary_op_p (enum tree_code code)
9699 return (code == TRUTH_NOT_EXPR
9700 || code == BIT_NOT_EXPR
9701 || code == COMPONENT_REF
9702 || code == TYPE_EXPR);
9705 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9706 errors are issued for invalid declarations. */
9709 grok_op_properties (tree decl, bool complain)
9711 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9713 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9714 tree name = DECL_NAME (decl);
9715 enum tree_code operator_code;
9720 /* Count the number of arguments and check for ellipsis. */
9721 for (argtype = argtypes, arity = 0;
9722 argtype && argtype != void_list_node;
9723 argtype = TREE_CHAIN (argtype))
9725 ellipsis_p = !argtype;
9727 class_type = DECL_CONTEXT (decl);
9728 if (class_type && !CLASS_TYPE_P (class_type))
9729 class_type = NULL_TREE;
9731 if (DECL_CONV_FN_P (decl))
9732 operator_code = TYPE_EXPR;
9736 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9737 if (ansi_opname (CODE) == name) \
9739 operator_code = (CODE); \
9742 else if (ansi_assopname (CODE) == name) \
9744 operator_code = (CODE); \
9745 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9749 #include "operators.def"
9755 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9756 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9759 switch (operator_code)
9762 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9766 TYPE_GETS_DELETE (class_type) |= 1;
9770 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9773 case VEC_DELETE_EXPR:
9774 TYPE_GETS_DELETE (class_type) |= 2;
9781 /* [basic.std.dynamic.allocation]/1:
9783 A program is ill-formed if an allocation function is declared
9784 in a namespace scope other than global scope or declared static
9787 The same also holds true for deallocation functions. */
9788 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9789 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9791 if (DECL_NAMESPACE_SCOPE_P (decl))
9793 if (CP_DECL_CONTEXT (decl) != global_namespace)
9795 error ("%qD may not be declared within a namespace", decl);
9798 else if (!TREE_PUBLIC (decl))
9800 error ("%qD may not be declared as static", decl);
9806 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9808 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9809 DECL_IS_OPERATOR_NEW (decl) = 1;
9811 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9812 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9815 /* An operator function must either be a non-static member function
9816 or have at least one parameter of a class, a reference to a class,
9817 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9818 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9820 if (operator_code == TYPE_EXPR
9821 || operator_code == CALL_EXPR
9822 || operator_code == COMPONENT_REF
9823 || operator_code == ARRAY_REF
9824 || operator_code == NOP_EXPR)
9826 error ("%qD must be a nonstatic member function", decl);
9833 if (DECL_STATIC_FUNCTION_P (decl))
9835 error ("%qD must be either a non-static member "
9836 "function or a non-member function", decl);
9840 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9842 tree arg = non_reference (TREE_VALUE (p));
9843 if (arg == error_mark_node)
9846 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9847 because these checks are performed even on
9848 template functions. */
9849 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9853 if (!p || p == void_list_node)
9856 error ("%qD must have an argument of class or "
9857 "enumerated type", decl);
9863 /* There are no restrictions on the arguments to an overloaded
9865 if (operator_code == CALL_EXPR)
9868 /* Warn about conversion operators that will never be used. */
9869 if (IDENTIFIER_TYPENAME_P (name)
9870 && ! DECL_TEMPLATE_INFO (decl)
9872 /* Warn only declaring the function; there is no need to
9873 warn again about out-of-class definitions. */
9874 && class_type == current_class_type)
9876 tree t = TREE_TYPE (name);
9877 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9878 const char *what = 0;
9881 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9883 if (TREE_CODE (t) == VOID_TYPE)
9885 else if (class_type)
9887 if (t == class_type)
9888 what = "the same type";
9889 /* Don't force t to be complete here. */
9890 else if (IS_AGGR_TYPE (t)
9891 && COMPLETE_TYPE_P (t)
9892 && DERIVED_FROM_P (t, class_type))
9893 what = "a base class";
9897 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9898 "conversion operator",
9899 ref ? "a reference to " : "", what);
9902 if (operator_code == COND_EXPR)
9905 error ("ISO C++ prohibits overloading operator ?:");
9908 else if (ellipsis_p)
9910 error ("%qD must not have variable number of arguments", decl);
9913 else if (ambi_op_p (operator_code))
9916 /* We pick the one-argument operator codes by default, so
9917 we don't have to change anything. */
9919 else if (arity == 2)
9921 /* If we thought this was a unary operator, we now know
9922 it to be a binary operator. */
9923 switch (operator_code)
9926 operator_code = MULT_EXPR;
9930 operator_code = BIT_AND_EXPR;
9933 case UNARY_PLUS_EXPR:
9934 operator_code = PLUS_EXPR;
9938 operator_code = MINUS_EXPR;
9941 case PREINCREMENT_EXPR:
9942 operator_code = POSTINCREMENT_EXPR;
9945 case PREDECREMENT_EXPR:
9946 operator_code = POSTDECREMENT_EXPR;
9953 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9955 if ((operator_code == POSTINCREMENT_EXPR
9956 || operator_code == POSTDECREMENT_EXPR)
9957 && ! processing_template_decl
9958 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9961 error ("postfix %qD must take %<int%> as its argument",
9964 error ("postfix %qD must take %<int%> as its second "
9972 error ("%qD must take either zero or one argument", decl);
9974 error ("%qD must take either one or two arguments", decl);
9978 /* More Effective C++ rule 6. */
9980 && (operator_code == POSTINCREMENT_EXPR
9981 || operator_code == POSTDECREMENT_EXPR
9982 || operator_code == PREINCREMENT_EXPR
9983 || operator_code == PREDECREMENT_EXPR))
9985 tree arg = TREE_VALUE (argtypes);
9986 tree ret = TREE_TYPE (TREE_TYPE (decl));
9987 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9988 arg = TREE_TYPE (arg);
9989 arg = TYPE_MAIN_VARIANT (arg);
9990 if (operator_code == PREINCREMENT_EXPR
9991 || operator_code == PREDECREMENT_EXPR)
9993 if (TREE_CODE (ret) != REFERENCE_TYPE
9994 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9996 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9997 build_reference_type (arg));
10001 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10002 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10006 else if (unary_op_p (operator_code))
10011 error ("%qD must take %<void%>", decl);
10013 error ("%qD must take exactly one argument", decl);
10017 else /* if (binary_op_p (operator_code)) */
10022 error ("%qD must take exactly one argument", decl);
10024 error ("%qD must take exactly two arguments", decl);
10028 /* More Effective C++ rule 7. */
10030 && (operator_code == TRUTH_ANDIF_EXPR
10031 || operator_code == TRUTH_ORIF_EXPR
10032 || operator_code == COMPOUND_EXPR))
10033 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10037 /* Effective C++ rule 23. */
10040 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10041 && (operator_code == PLUS_EXPR
10042 || operator_code == MINUS_EXPR
10043 || operator_code == TRUNC_DIV_EXPR
10044 || operator_code == MULT_EXPR
10045 || operator_code == TRUNC_MOD_EXPR)
10046 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10047 warning (OPT_Weffc__, "%qD should return by value", decl);
10049 /* [over.oper]/8 */
10050 for (; argtypes && argtypes != void_list_node;
10051 argtypes = TREE_CHAIN (argtypes))
10052 if (TREE_PURPOSE (argtypes))
10054 TREE_PURPOSE (argtypes) = NULL_TREE;
10055 if (operator_code == POSTINCREMENT_EXPR
10056 || operator_code == POSTDECREMENT_EXPR)
10059 pedwarn ("%qD cannot have default arguments", decl);
10063 error ("%qD cannot have default arguments", decl);
10071 /* Return a string giving the keyword associate with CODE. */
10073 static const char *
10074 tag_name (enum tag_types code)
10086 case typename_type:
10089 gcc_unreachable ();
10093 /* Name lookup in an elaborated-type-specifier (after the keyword
10094 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10095 elaborated-type-specifier is invalid, issue a diagnostic and return
10096 error_mark_node; otherwise, return the *_TYPE to which it referred.
10097 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10100 check_elaborated_type_specifier (enum tag_types tag_code,
10102 bool allow_template_p)
10108 struct S { struct S *p; };
10110 name lookup will find the TYPE_DECL for the implicit "S::S"
10111 typedef. Adjust for that here. */
10112 if (DECL_SELF_REFERENCE_P (decl))
10113 decl = TYPE_NAME (TREE_TYPE (decl));
10115 type = TREE_TYPE (decl);
10117 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10118 is false for this case as well. */
10119 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10121 error ("using template type parameter %qT after %qs",
10122 type, tag_name (tag_code));
10123 return error_mark_node;
10127 If the identifier resolves to a typedef-name or a template
10128 type-parameter, the elaborated-type-specifier is ill-formed.
10130 In other words, the only legitimate declaration to use in the
10131 elaborated type specifier is the implicit typedef created when
10132 the type is declared. */
10133 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10134 && tag_code != typename_type)
10136 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10137 error ("%q+D has a previous declaration here", decl);
10138 return error_mark_node;
10140 else if (TREE_CODE (type) != RECORD_TYPE
10141 && TREE_CODE (type) != UNION_TYPE
10142 && tag_code != enum_type
10143 && tag_code != typename_type)
10145 error ("%qT referred to as %qs", type, tag_name (tag_code));
10146 error ("%q+T has a previous declaration here", type);
10147 return error_mark_node;
10149 else if (TREE_CODE (type) != ENUMERAL_TYPE
10150 && tag_code == enum_type)
10152 error ("%qT referred to as enum", type);
10153 error ("%q+T has a previous declaration here", type);
10154 return error_mark_node;
10156 else if (!allow_template_p
10157 && TREE_CODE (type) == RECORD_TYPE
10158 && CLASSTYPE_IS_TEMPLATE (type))
10160 /* If a class template appears as elaborated type specifier
10161 without a template header such as:
10163 template <class T> class C {};
10164 void f(class C); // No template header here
10166 then the required template argument is missing. */
10167 error ("template argument required for %<%s %T%>",
10168 tag_name (tag_code),
10169 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10170 return error_mark_node;
10176 /* Lookup NAME in elaborate type specifier in scope according to
10177 SCOPE and issue diagnostics if necessary.
10178 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10179 found, and ERROR_MARK_NODE for type error. */
10182 lookup_and_check_tag (enum tag_types tag_code, tree name,
10183 tag_scope scope, bool template_header_p)
10187 if (scope == ts_global)
10189 /* First try ordinary name lookup, ignoring hidden class name
10190 injected via friend declaration. */
10191 decl = lookup_name_prefer_type (name, 2);
10192 /* If that fails, the name will be placed in the smallest
10193 non-class, non-function-prototype scope according to 3.3.1/5.
10194 We may already have a hidden name declared as friend in this
10195 scope. So lookup again but not ignoring hidden names.
10196 If we find one, that name will be made visible rather than
10197 creating a new tag. */
10199 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10202 decl = lookup_type_scope (name, scope);
10204 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10205 decl = DECL_TEMPLATE_RESULT (decl);
10207 if (decl && TREE_CODE (decl) == TYPE_DECL)
10209 /* Look for invalid nested type:
10213 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10215 error ("%qD has the same name as the class in which it is "
10218 return error_mark_node;
10221 /* Two cases we need to consider when deciding if a class
10222 template is allowed as an elaborated type specifier:
10223 1. It is a self reference to its own class.
10224 2. It comes with a template header.
10228 template <class T> class C {
10229 class C *c1; // DECL_SELF_REFERENCE_P is true
10232 template <class U> class C; // template_header_p is true
10233 template <class T> class C<T>::D {
10234 class C *c2; // DECL_SELF_REFERENCE_P is true
10237 t = check_elaborated_type_specifier (tag_code,
10240 | DECL_SELF_REFERENCE_P (decl));
10243 else if (decl && TREE_CODE (decl) == TREE_LIST)
10245 error ("reference to %qD is ambiguous", name);
10246 print_candidates (decl);
10247 return error_mark_node;
10253 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10254 Define the tag as a forward-reference if it is not defined.
10256 If a declaration is given, process it here, and report an error if
10257 multiple declarations are not identical.
10259 SCOPE is TS_CURRENT when this is also a definition. Only look in
10260 the current frame for the name (since C++ allows new names in any
10261 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10262 declaration. Only look beginning from the current scope outward up
10263 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10265 TEMPLATE_HEADER_P is true when this declaration is preceded by
10266 a set of template parameters. */
10269 xref_tag (enum tag_types tag_code, tree name,
10270 tag_scope scope, bool template_header_p)
10272 enum tree_code code;
10274 tree context = NULL_TREE;
10276 timevar_push (TV_NAME_LOOKUP);
10278 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10284 code = RECORD_TYPE;
10290 code = ENUMERAL_TYPE;
10293 gcc_unreachable ();
10296 /* In case of anonymous name, xref_tag is only called to
10297 make type node and push name. Name lookup is not required. */
10298 if (ANON_AGGRNAME_P (name))
10301 t = lookup_and_check_tag (tag_code, name,
10302 scope, template_header_p);
10304 if (t == error_mark_node)
10305 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10307 if (scope != ts_current && t && current_class_type
10308 && template_class_depth (current_class_type)
10309 && template_header_p)
10311 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10312 definition of this tag. Since, in addition, we are currently
10313 processing a (member) template declaration of a template
10314 class, we must be very careful; consider:
10321 { template <class V>
10322 friend struct S1; };
10324 Here, the S2::S1 declaration should not be confused with the
10325 outer declaration. In particular, the inner version should
10326 have a template parameter of level 2, not level 1. This
10327 would be particularly important if the member declaration
10330 template <class V = U> friend struct S1;
10332 say, when we should tsubst into `U' when instantiating
10333 S2. On the other hand, when presented with:
10343 we must find the inner binding eventually. We
10344 accomplish this by making sure that the new type we
10345 create to represent this declaration has the right
10347 context = TYPE_CONTEXT (t);
10353 /* If no such tag is yet defined, create a forward-reference node
10354 and record it as the "definition".
10355 When a real declaration of this type is found,
10356 the forward-reference will be altered into a real type. */
10357 if (code == ENUMERAL_TYPE)
10359 error ("use of enum %q#D without previous declaration", name);
10360 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10364 t = make_aggr_type (code);
10365 TYPE_CONTEXT (t) = context;
10366 t = pushtag (name, t, scope);
10371 if (template_header_p && IS_AGGR_TYPE (t))
10373 if (!redeclare_class_template (t, current_template_parms))
10374 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10376 else if (!processing_template_decl
10377 && CLASS_TYPE_P (t)
10378 && CLASSTYPE_IS_TEMPLATE (t))
10380 error ("redeclaration of %qT as a non-template", t);
10381 error ("previous declaration %q+D", t);
10382 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10385 /* Make injected friend class visible. */
10386 if (scope != ts_within_enclosing_non_class
10387 && hidden_name_p (TYPE_NAME (t)))
10389 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10390 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10392 if (TYPE_TEMPLATE_INFO (t))
10394 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10395 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10400 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10404 xref_tag_from_type (tree old, tree id, tag_scope scope)
10406 enum tag_types tag_kind;
10408 if (TREE_CODE (old) == RECORD_TYPE)
10409 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10411 tag_kind = union_type;
10413 if (id == NULL_TREE)
10414 id = TYPE_IDENTIFIER (old);
10416 return xref_tag (tag_kind, id, scope, false);
10419 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10420 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10421 access_* node, and the TREE_VALUE is the type of the base-class.
10422 Non-NULL TREE_TYPE indicates virtual inheritance.
10424 Returns true if the binfo hierarchy was successfully created,
10425 false if an error was detected. */
10428 xref_basetypes (tree ref, tree base_list)
10431 tree binfo, base_binfo;
10432 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10433 unsigned max_bases = 0; /* Maximum direct bases. */
10435 tree default_access;
10436 tree igo_prev; /* Track Inheritance Graph Order. */
10438 if (ref == error_mark_node)
10441 /* The base of a derived class is private by default, all others are
10443 default_access = (TREE_CODE (ref) == RECORD_TYPE
10444 && CLASSTYPE_DECLARED_CLASS (ref)
10445 ? access_private_node : access_public_node);
10447 /* First, make sure that any templates in base-classes are
10448 instantiated. This ensures that if we call ourselves recursively
10449 we do not get confused about which classes are marked and which
10451 basep = &base_list;
10454 tree basetype = TREE_VALUE (*basep);
10456 if (!(processing_template_decl && uses_template_parms (basetype))
10457 && !complete_type_or_else (basetype, NULL))
10458 /* An incomplete type. Remove it from the list. */
10459 *basep = TREE_CHAIN (*basep);
10463 if (TREE_TYPE (*basep))
10465 if (CLASS_TYPE_P (basetype))
10466 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10467 basep = &TREE_CHAIN (*basep);
10471 TYPE_MARKED_P (ref) = 1;
10473 /* The binfo slot should be empty, unless this is an (ill-formed)
10475 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10476 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10478 binfo = make_tree_binfo (max_bases);
10480 TYPE_BINFO (ref) = binfo;
10481 BINFO_OFFSET (binfo) = size_zero_node;
10482 BINFO_TYPE (binfo) = ref;
10486 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10487 /* An aggregate cannot have baseclasses. */
10488 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10490 if (TREE_CODE (ref) == UNION_TYPE)
10492 error ("derived union %qT invalid", ref);
10499 if (TYPE_FOR_JAVA (ref))
10501 error ("Java class %qT cannot have multiple bases", ref);
10508 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10510 if (TYPE_FOR_JAVA (ref))
10512 error ("Java class %qT cannot have virtual bases", ref);
10517 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10519 tree access = TREE_PURPOSE (base_list);
10520 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10521 tree basetype = TREE_VALUE (base_list);
10523 if (access == access_default_node)
10524 access = default_access;
10526 if (PACK_EXPANSION_P (basetype))
10527 basetype = PACK_EXPANSION_PATTERN (basetype);
10528 if (TREE_CODE (basetype) == TYPE_DECL)
10529 basetype = TREE_TYPE (basetype);
10530 if (TREE_CODE (basetype) != RECORD_TYPE
10531 && TREE_CODE (basetype) != TYPENAME_TYPE
10532 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10533 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10535 error ("base type %qT fails to be a struct or class type",
10540 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10541 TYPE_FOR_JAVA (ref) = 1;
10543 base_binfo = NULL_TREE;
10544 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10546 base_binfo = TYPE_BINFO (basetype);
10547 /* The original basetype could have been a typedef'd type. */
10548 basetype = BINFO_TYPE (base_binfo);
10550 /* Inherit flags from the base. */
10551 TYPE_HAS_NEW_OPERATOR (ref)
10552 |= TYPE_HAS_NEW_OPERATOR (basetype);
10553 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10554 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10555 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10556 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10557 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10558 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10559 CLASSTYPE_REPEATED_BASE_P (ref)
10560 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10563 /* We must do this test after we've seen through a typedef
10565 if (TYPE_MARKED_P (basetype))
10567 if (basetype == ref)
10568 error ("recursive type %qT undefined", basetype);
10570 error ("duplicate base type %qT invalid", basetype);
10574 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10575 /* Regenerate the pack expansion for the bases. */
10576 basetype = make_pack_expansion (basetype);
10578 TYPE_MARKED_P (basetype) = 1;
10580 base_binfo = copy_binfo (base_binfo, basetype, ref,
10581 &igo_prev, via_virtual);
10582 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10583 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10585 BINFO_BASE_APPEND (binfo, base_binfo);
10586 BINFO_BASE_ACCESS_APPEND (binfo, access);
10589 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10590 /* If we have space in the vbase vector, we must have shared at
10591 least one of them, and are therefore diamond shaped. */
10592 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10594 /* Unmark all the types. */
10595 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10596 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10597 TYPE_MARKED_P (ref) = 0;
10599 /* Now see if we have a repeated base type. */
10600 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10602 for (base_binfo = binfo; base_binfo;
10603 base_binfo = TREE_CHAIN (base_binfo))
10605 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10607 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10610 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10612 for (base_binfo = binfo; base_binfo;
10613 base_binfo = TREE_CHAIN (base_binfo))
10614 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10615 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10624 /* Begin compiling the definition of an enumeration type.
10626 Returns the type object, as yet incomplete.
10627 Also records info about it so that build_enumerator
10628 may be used to declare the individual values as they are read. */
10631 start_enum (tree name)
10635 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10637 /* If this is the real definition for a previous forward reference,
10638 fill in the contents in the same object that used to be the
10639 forward reference. */
10641 enumtype = lookup_and_check_tag (enum_type, name,
10642 /*tag_scope=*/ts_current,
10643 /*template_header_p=*/false);
10645 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10647 error ("multiple definition of %q#T", enumtype);
10648 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10649 /* Clear out TYPE_VALUES, and start again. */
10650 TYPE_VALUES (enumtype) = NULL_TREE;
10654 /* In case of error, make a dummy enum to allow parsing to
10656 if (enumtype == error_mark_node)
10657 name = make_anon_name ();
10659 enumtype = make_node (ENUMERAL_TYPE);
10660 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10666 /* After processing and defining all the values of an enumeration type,
10667 install their decls in the enumeration type and finish it off.
10668 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10671 finish_enum (tree enumtype)
10680 bool use_short_enum;
10684 integer_type_kind itk;
10685 tree underlying_type = NULL_TREE;
10687 /* We built up the VALUES in reverse order. */
10688 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10690 /* For an enum defined in a template, just set the type of the values;
10691 all further processing is postponed until the template is
10692 instantiated. We need to set the type so that tsubst of a CONST_DECL
10694 if (processing_template_decl)
10696 for (values = TYPE_VALUES (enumtype);
10698 values = TREE_CHAIN (values))
10699 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10700 if (at_function_scope_p ())
10701 add_stmt (build_min (TAG_DEFN, enumtype));
10705 /* Determine the minimum and maximum values of the enumerators. */
10706 if (TYPE_VALUES (enumtype))
10708 minnode = maxnode = NULL_TREE;
10710 for (values = TYPE_VALUES (enumtype);
10712 values = TREE_CHAIN (values))
10714 decl = TREE_VALUE (values);
10716 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10717 each enumerator has the type of its enumeration. Prior to the
10718 closing brace, the type of each enumerator is the type of its
10719 initializing value. */
10720 TREE_TYPE (decl) = enumtype;
10722 /* Update the minimum and maximum values, if appropriate. */
10723 value = DECL_INITIAL (decl);
10724 if (value == error_mark_node)
10725 value = integer_zero_node;
10726 /* Figure out what the minimum and maximum values of the
10727 enumerators are. */
10729 minnode = maxnode = value;
10730 else if (tree_int_cst_lt (maxnode, value))
10732 else if (tree_int_cst_lt (value, minnode))
10739 If the enumerator-list is empty, the underlying type is as if
10740 the enumeration had a single enumerator with value 0. */
10741 minnode = maxnode = integer_zero_node;
10743 /* Compute the number of bits require to represent all values of the
10744 enumeration. We must do this before the type of MINNODE and
10745 MAXNODE are transformed, since min_precision relies on the
10746 TREE_TYPE of the value it is passed. */
10747 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10748 lowprec = min_precision (minnode, unsignedp);
10749 highprec = min_precision (maxnode, unsignedp);
10750 precision = MAX (lowprec, highprec);
10752 /* Determine the underlying type of the enumeration.
10756 The underlying type of an enumeration is an integral type that
10757 can represent all the enumerator values defined in the
10758 enumeration. It is implementation-defined which integral type is
10759 used as the underlying type for an enumeration except that the
10760 underlying type shall not be larger than int unless the value of
10761 an enumerator cannot fit in an int or unsigned int.
10763 We use "int" or an "unsigned int" as the underlying type, even if
10764 a smaller integral type would work, unless the user has
10765 explicitly requested that we use the smallest possible type. The
10766 user can request that for all enumerations with a command line
10767 flag, or for just one enumeration with an attribute. */
10769 use_short_enum = flag_short_enums
10770 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10772 for (itk = (use_short_enum ? itk_char : itk_int);
10776 underlying_type = integer_types[itk];
10777 if (TYPE_PRECISION (underlying_type) >= precision
10778 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10781 if (itk == itk_none)
10785 IF no integral type can represent all the enumerator values, the
10786 enumeration is ill-formed. */
10787 error ("no integral type can represent all of the enumerator values "
10788 "for %qT", enumtype);
10789 precision = TYPE_PRECISION (long_long_integer_type_node);
10790 underlying_type = integer_types[itk_unsigned_long_long];
10793 /* Compute the minium and maximum values for the type.
10797 For an enumeration where emin is the smallest enumerator and emax
10798 is the largest, the values of the enumeration are the values of the
10799 underlying type in the range bmin to bmax, where bmin and bmax are,
10800 respectively, the smallest and largest values of the smallest bit-
10801 field that can store emin and emax. */
10803 /* The middle-end currently assumes that types with TYPE_PRECISION
10804 narrower than their underlying type are suitably zero or sign
10805 extended to fill their mode. g++ doesn't make these guarantees.
10806 Until the middle-end can represent such paradoxical types, we
10807 set the TYPE_PRECISION to the width of the underlying type. */
10808 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10810 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10814 The value of sizeof() applied to an enumeration type, an object
10815 of an enumeration type, or an enumerator, is the value of sizeof()
10816 applied to the underlying type. */
10817 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10818 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10819 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10820 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10821 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10822 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10824 /* Convert each of the enumerators to the type of the underlying
10825 type of the enumeration. */
10826 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10828 location_t saved_location;
10830 decl = TREE_VALUE (values);
10831 saved_location = input_location;
10832 input_location = DECL_SOURCE_LOCATION (decl);
10833 value = perform_implicit_conversion (underlying_type,
10834 DECL_INITIAL (decl));
10835 input_location = saved_location;
10837 /* Do not clobber shared ints. */
10838 value = copy_node (value);
10840 TREE_TYPE (value) = enumtype;
10841 DECL_INITIAL (decl) = value;
10842 TREE_VALUE (values) = value;
10845 /* Fix up all variant types of this enum type. */
10846 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10848 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10849 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10850 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10851 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10852 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10853 TYPE_MODE (t) = TYPE_MODE (enumtype);
10854 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10855 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10856 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10857 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10860 /* Finish debugging output for this type. */
10861 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10864 /* Build and install a CONST_DECL for an enumeration constant of the
10865 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10866 Assignment of sequential values by default is handled here. */
10869 build_enumerator (tree name, tree value, tree enumtype)
10875 /* If the VALUE was erroneous, pretend it wasn't there; that will
10876 result in the enum being assigned the next value in sequence. */
10877 if (value == error_mark_node)
10880 /* Remove no-op casts from the value. */
10882 STRIP_TYPE_NOPS (value);
10884 if (! processing_template_decl)
10886 /* Validate and default VALUE. */
10887 if (value != NULL_TREE)
10889 value = integral_constant_value (value);
10891 if (TREE_CODE (value) == INTEGER_CST)
10893 value = perform_integral_promotions (value);
10894 constant_expression_warning (value);
10898 error ("enumerator value for %qD is not an integer constant", name);
10903 /* Default based on previous value. */
10904 if (value == NULL_TREE)
10906 if (TYPE_VALUES (enumtype))
10909 unsigned HOST_WIDE_INT lo;
10913 /* The next value is the previous value plus one. We can
10914 safely assume that the previous value is an INTEGER_CST.
10915 add_double doesn't know the type of the target expression,
10916 so we must check with int_fits_type_p as well. */
10917 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10918 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10919 TREE_INT_CST_HIGH (prev_value),
10921 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10922 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10926 error ("overflow in enumeration values at %qD", name);
10927 value = error_mark_node;
10931 value = integer_zero_node;
10934 /* Remove no-op casts from the value. */
10935 STRIP_TYPE_NOPS (value);
10938 /* C++ associates enums with global, function, or class declarations. */
10939 context = current_scope ();
10941 /* Build the actual enumeration constant. Note that the enumeration
10942 constants have the type of their initializers until the
10943 enumeration is complete:
10947 Following the closing brace of an enum-specifier, each enumer-
10948 ator has the type of its enumeration. Prior to the closing
10949 brace, the type of each enumerator is the type of its
10950 initializing value.
10952 In finish_enum we will reset the type. Of course, if we're
10953 processing a template, there may be no value. */
10954 type = value ? TREE_TYPE (value) : NULL_TREE;
10956 if (context && context == current_class_type)
10957 /* This enum declaration is local to the class. We need the full
10958 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10959 decl = build_lang_decl (CONST_DECL, name, type);
10961 /* It's a global enum, or it's local to a function. (Note local to
10962 a function could mean local to a class method. */
10963 decl = build_decl (CONST_DECL, name, type);
10965 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10966 TREE_CONSTANT (decl) = 1;
10967 TREE_INVARIANT (decl) = 1;
10968 TREE_READONLY (decl) = 1;
10969 DECL_INITIAL (decl) = value;
10971 if (context && context == current_class_type)
10972 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10973 on the TYPE_FIELDS list for `S'. (That's so that you can say
10974 things like `S::i' later.) */
10975 finish_member_declaration (decl);
10979 /* Add this enumeration constant to the list for this type. */
10980 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10984 /* We're defining DECL. Make sure that it's type is OK. */
10987 check_function_type (tree decl, tree current_function_parms)
10989 tree fntype = TREE_TYPE (decl);
10990 tree return_type = complete_type (TREE_TYPE (fntype));
10992 /* In a function definition, arg types must be complete. */
10993 require_complete_types_for_parms (current_function_parms);
10995 if (dependent_type_p (return_type))
10997 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
10998 || (TYPE_FOR_JAVA (return_type) && IS_AGGR_TYPE (return_type)))
11000 tree args = TYPE_ARG_TYPES (fntype);
11002 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11003 error ("return type %q#T is incomplete", return_type);
11005 error ("return type has Java class type %q#T", return_type);
11007 /* Make it return void instead. */
11008 if (TREE_CODE (fntype) == METHOD_TYPE)
11009 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11011 TREE_CHAIN (args));
11013 fntype = build_function_type (void_type_node, args);
11015 = build_exception_variant (fntype,
11016 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11019 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11022 /* Create the FUNCTION_DECL for a function definition.
11023 DECLSPECS and DECLARATOR are the parts of the declaration;
11024 they describe the function's name and the type it returns,
11025 but twisted together in a fashion that parallels the syntax of C.
11027 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11028 DECLARATOR is really the DECL for the function we are about to
11029 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11030 indicating that the function is an inline defined in-class.
11032 This function creates a binding context for the function body
11033 as well as setting up the FUNCTION_DECL in current_function_decl.
11035 For C++, we must first check whether that datum makes any sense.
11036 For example, "class A local_a(1,2);" means that variable local_a
11037 is an aggregate of type A, which should have a constructor
11038 applied to it with the argument list [1, 2].
11040 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11041 or may be a BLOCK if the function has been defined previously
11042 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11043 error_mark_node if the function has never been defined, or
11044 a BLOCK if the function has been defined somewhere. */
11047 start_preparsed_function (tree decl1, tree attrs, int flags)
11049 tree ctype = NULL_TREE;
11052 int doing_friend = 0;
11053 struct cp_binding_level *bl;
11054 tree current_function_parms;
11055 struct c_fileinfo *finfo
11056 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11057 bool honor_interface;
11059 /* Sanity check. */
11060 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11061 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11063 fntype = TREE_TYPE (decl1);
11064 if (TREE_CODE (fntype) == METHOD_TYPE)
11065 ctype = TYPE_METHOD_BASETYPE (fntype);
11067 /* ISO C++ 11.4/5. A friend function defined in a class is in
11068 the (lexical) scope of the class in which it is defined. */
11069 if (!ctype && DECL_FRIEND_P (decl1))
11071 ctype = DECL_FRIEND_CONTEXT (decl1);
11073 /* CTYPE could be null here if we're dealing with a template;
11074 for example, `inline friend float foo()' inside a template
11075 will have no CTYPE set. */
11076 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11082 if (DECL_DECLARED_INLINE_P (decl1)
11083 && lookup_attribute ("noinline", attrs))
11084 warning (0, "inline function %q+D given attribute noinline", decl1);
11086 /* Handle gnu_inline attribute. */
11087 if (GNU_INLINE_P (decl1))
11089 DECL_EXTERNAL (decl1) = 1;
11090 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11091 DECL_INTERFACE_KNOWN (decl1) = 1;
11092 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11095 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11096 /* This is a constructor, we must ensure that any default args
11097 introduced by this definition are propagated to the clones
11098 now. The clones are used directly in overload resolution. */
11099 adjust_clone_args (decl1);
11101 /* Sometimes we don't notice that a function is a static member, and
11102 build a METHOD_TYPE for it. Fix that up now. */
11103 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11104 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11106 revert_static_member_fn (decl1);
11110 /* Set up current_class_type, and enter the scope of the class, if
11113 push_nested_class (ctype);
11114 else if (DECL_STATIC_FUNCTION_P (decl1))
11115 push_nested_class (DECL_CONTEXT (decl1));
11117 /* Now that we have entered the scope of the class, we must restore
11118 the bindings for any template parameters surrounding DECL1, if it
11119 is an inline member template. (Order is important; consider the
11120 case where a template parameter has the same name as a field of
11121 the class.) It is not until after this point that
11122 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11123 if (flags & SF_INCLASS_INLINE)
11124 maybe_begin_member_template_processing (decl1);
11126 /* Effective C++ rule 15. */
11128 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11129 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11130 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11132 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11133 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11134 if (!DECL_INITIAL (decl1))
11135 DECL_INITIAL (decl1) = error_mark_node;
11137 /* This function exists in static storage.
11138 (This does not mean `static' in the C sense!) */
11139 TREE_STATIC (decl1) = 1;
11141 /* We must call push_template_decl after current_class_type is set
11142 up. (If we are processing inline definitions after exiting a
11143 class scope, current_class_type will be NULL_TREE until set above
11144 by push_nested_class.) */
11145 if (processing_template_decl)
11147 /* FIXME: Handle error_mark_node more gracefully. */
11148 tree newdecl1 = push_template_decl (decl1);
11149 if (newdecl1 != error_mark_node)
11153 /* We are now in the scope of the function being defined. */
11154 current_function_decl = decl1;
11156 /* Save the parm names or decls from this function's declarator
11157 where store_parm_decls will find them. */
11158 current_function_parms = DECL_ARGUMENTS (decl1);
11160 /* Make sure the parameter and return types are reasonable. When
11161 you declare a function, these types can be incomplete, but they
11162 must be complete when you define the function. */
11163 check_function_type (decl1, current_function_parms);
11165 /* Build the return declaration for the function. */
11166 restype = TREE_TYPE (fntype);
11167 if (DECL_RESULT (decl1) == NULL_TREE)
11171 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11172 DECL_ARTIFICIAL (resdecl) = 1;
11173 DECL_IGNORED_P (resdecl) = 1;
11174 DECL_RESULT (decl1) = resdecl;
11176 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11179 /* Let the user know we're compiling this function. */
11180 announce_function (decl1);
11182 /* Record the decl so that the function name is defined.
11183 If we already have a decl for this name, and it is a FUNCTION_DECL,
11184 use the old decl. */
11185 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11187 /* A specialization is not used to guide overload resolution. */
11188 if (!DECL_FUNCTION_MEMBER_P (decl1)
11189 && !(DECL_USE_TEMPLATE (decl1) &&
11190 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11192 tree olddecl = pushdecl (decl1);
11194 if (olddecl == error_mark_node)
11195 /* If something went wrong when registering the declaration,
11196 use DECL1; we have to have a FUNCTION_DECL to use when
11197 parsing the body of the function. */
11201 /* Otherwise, OLDDECL is either a previous declaration
11202 of the same function or DECL1 itself. */
11204 if (warn_missing_declarations
11205 && olddecl == decl1
11206 && !DECL_MAIN_P (decl1)
11207 && TREE_PUBLIC (decl1)
11208 && !DECL_DECLARED_INLINE_P (decl1))
11212 /* Check whether DECL1 is in an anonymous
11214 for (context = DECL_CONTEXT (decl1);
11216 context = DECL_CONTEXT (context))
11218 if (TREE_CODE (context) == NAMESPACE_DECL
11219 && DECL_NAME (context) == NULL_TREE)
11223 if (context == NULL)
11224 warning (OPT_Wmissing_declarations,
11225 "no previous declaration for %q+D", decl1);
11233 /* We need to set the DECL_CONTEXT. */
11234 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11235 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11237 fntype = TREE_TYPE (decl1);
11239 /* If #pragma weak applies, mark the decl appropriately now.
11240 The pragma only applies to global functions. Because
11241 determining whether or not the #pragma applies involves
11242 computing the mangled name for the declaration, we cannot
11243 apply the pragma until after we have merged this declaration
11244 with any previous declarations; if the original declaration
11245 has a linkage specification, that specification applies to
11246 the definition as well, and may affect the mangled name. */
11247 if (!DECL_CONTEXT (decl1))
11248 maybe_apply_pragma_weak (decl1);
11251 /* Reset this in case the call to pushdecl changed it. */
11252 current_function_decl = decl1;
11254 gcc_assert (DECL_INITIAL (decl1));
11256 /* This function may already have been parsed, in which case just
11257 return; our caller will skip over the body without parsing. */
11258 if (DECL_INITIAL (decl1) != error_mark_node)
11261 /* Initialize RTL machinery. We cannot do this until
11262 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11263 even when processing a template; this is how we get
11264 CFUN set up, and our per-function variables initialized.
11265 FIXME factor out the non-RTL stuff. */
11266 bl = current_binding_level;
11267 allocate_struct_function (decl1, processing_template_decl);
11268 current_binding_level = bl;
11270 /* Even though we're inside a function body, we still don't want to
11271 call expand_expr to calculate the size of a variable-sized array.
11272 We haven't necessarily assigned RTL to all variables yet, so it's
11273 not safe to try to expand expressions involving them. */
11274 cfun->x_dont_save_pending_sizes_p = 1;
11276 /* Start the statement-tree, start the tree now. */
11277 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11279 /* If we are (erroneously) defining a function that we have already
11280 defined before, wipe out what we knew before. */
11281 if (!DECL_PENDING_INLINE_P (decl1))
11282 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11284 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11286 /* We know that this was set up by `grokclassfn'. We do not
11287 wait until `store_parm_decls', since evil parse errors may
11288 never get us to that point. Here we keep the consistency
11289 between `current_class_type' and `current_class_ptr'. */
11290 tree t = DECL_ARGUMENTS (decl1);
11292 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11293 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11295 cp_function_chain->x_current_class_ref
11296 = build_indirect_ref (t, NULL);
11297 cp_function_chain->x_current_class_ptr = t;
11299 /* Constructors and destructors need to know whether they're "in
11300 charge" of initializing virtual base classes. */
11301 t = TREE_CHAIN (t);
11302 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11304 current_in_charge_parm = t;
11305 t = TREE_CHAIN (t);
11307 if (DECL_HAS_VTT_PARM_P (decl1))
11309 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11310 current_vtt_parm = t;
11314 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11315 /* Implicitly-defined methods (like the
11316 destructor for a class in which no destructor
11317 is explicitly declared) must not be defined
11318 until their definition is needed. So, we
11319 ignore interface specifications for
11320 compiler-generated functions. */
11321 && !DECL_ARTIFICIAL (decl1));
11323 if (DECL_INTERFACE_KNOWN (decl1))
11325 tree ctx = decl_function_context (decl1);
11327 if (DECL_NOT_REALLY_EXTERN (decl1))
11328 DECL_EXTERNAL (decl1) = 0;
11330 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11331 && TREE_PUBLIC (ctx))
11332 /* This is a function in a local class in an extern inline
11334 comdat_linkage (decl1);
11336 /* If this function belongs to an interface, it is public.
11337 If it belongs to someone else's interface, it is also external.
11338 This only affects inlines and template instantiations. */
11339 else if (!finfo->interface_unknown && honor_interface)
11341 if (DECL_DECLARED_INLINE_P (decl1)
11342 || DECL_TEMPLATE_INSTANTIATION (decl1)
11343 || processing_template_decl)
11345 DECL_EXTERNAL (decl1)
11346 = (finfo->interface_only
11347 || (DECL_DECLARED_INLINE_P (decl1)
11348 && ! flag_implement_inlines
11349 && !DECL_VINDEX (decl1)));
11351 /* For WIN32 we also want to put these in linkonce sections. */
11352 maybe_make_one_only (decl1);
11355 DECL_EXTERNAL (decl1) = 0;
11356 DECL_INTERFACE_KNOWN (decl1) = 1;
11357 /* If this function is in an interface implemented in this file,
11358 make sure that the back end knows to emit this function
11360 if (!DECL_EXTERNAL (decl1))
11361 mark_needed (decl1);
11363 else if (finfo->interface_unknown && finfo->interface_only
11364 && honor_interface)
11366 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11367 interface, we will have both finfo->interface_unknown and
11368 finfo->interface_only set. In that case, we don't want to
11369 use the normal heuristics because someone will supply a
11370 #pragma implementation elsewhere, and deducing it here would
11371 produce a conflict. */
11372 comdat_linkage (decl1);
11373 DECL_EXTERNAL (decl1) = 0;
11374 DECL_INTERFACE_KNOWN (decl1) = 1;
11375 DECL_DEFER_OUTPUT (decl1) = 1;
11379 /* This is a definition, not a reference.
11380 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11381 if (!GNU_INLINE_P (decl1))
11382 DECL_EXTERNAL (decl1) = 0;
11384 if ((DECL_DECLARED_INLINE_P (decl1)
11385 || DECL_TEMPLATE_INSTANTIATION (decl1))
11386 && ! DECL_INTERFACE_KNOWN (decl1)
11387 /* Don't try to defer nested functions for now. */
11388 && ! decl_function_context (decl1))
11389 DECL_DEFER_OUTPUT (decl1) = 1;
11391 DECL_INTERFACE_KNOWN (decl1) = 1;
11394 /* Determine the ELF visibility attribute for the function. We must not
11395 do this before calling "pushdecl", as we must allow "duplicate_decls"
11396 to merge any attributes appropriately. We also need to wait until
11398 if (!DECL_CLONED_FUNCTION_P (decl1))
11399 determine_visibility (decl1);
11401 begin_scope (sk_function_parms, decl1);
11405 if (DECL_DESTRUCTOR_P (decl1)
11406 || (DECL_CONSTRUCTOR_P (decl1)
11407 && targetm.cxx.cdtor_returns_this ()))
11409 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11410 DECL_CONTEXT (cdtor_label) = current_function_decl;
11413 start_fname_decls ();
11415 store_parm_decls (current_function_parms);
11419 /* Like start_preparsed_function, except that instead of a
11420 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11422 Returns 1 on success. If the DECLARATOR is not suitable for a function
11423 (it defines a datum instead), we return 0, which tells
11424 yyparse to report a parse error. */
11427 start_function (cp_decl_specifier_seq *declspecs,
11428 const cp_declarator *declarator,
11433 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11434 /* If the declarator is not suitable for a function definition,
11435 cause a syntax error. */
11436 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11439 if (DECL_MAIN_P (decl1))
11440 /* main must return int. grokfndecl should have corrected it
11441 (and issued a diagnostic) if the user got it wrong. */
11442 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11443 integer_type_node));
11445 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11450 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11454 use_eh_spec_block (tree fn)
11456 return (flag_exceptions && flag_enforce_eh_specs
11457 && !processing_template_decl
11458 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11459 /* We insert the EH_SPEC_BLOCK only in the original
11460 function; then, it is copied automatically to the
11462 && !DECL_CLONED_FUNCTION_P (fn)
11463 /* Implicitly-generated constructors and destructors have
11464 exception specifications. However, those specifications
11465 are the union of the possible exceptions specified by the
11466 constructors/destructors for bases and members, so no
11467 unallowed exception will ever reach this function. By
11468 not creating the EH_SPEC_BLOCK we save a little memory,
11469 and we avoid spurious warnings about unreachable
11471 && !DECL_ARTIFICIAL (fn));
11474 /* Store the parameter declarations into the current function declaration.
11475 This is called after parsing the parameter declarations, before
11476 digesting the body of the function.
11478 Also install to binding contour return value identifier, if any. */
11481 store_parm_decls (tree current_function_parms)
11483 tree fndecl = current_function_decl;
11486 /* This is a chain of any other decls that came in among the parm
11487 declarations. If a parm is declared with enum {foo, bar} x;
11488 then CONST_DECLs for foo and bar are put here. */
11489 tree nonparms = NULL_TREE;
11491 if (current_function_parms)
11493 /* This case is when the function was defined with an ANSI prototype.
11494 The parms already have decls, so we need not do anything here
11495 except record them as in effect
11496 and complain if any redundant old-style parm decls were written. */
11498 tree specparms = current_function_parms;
11501 /* Must clear this because it might contain TYPE_DECLs declared
11503 current_binding_level->names = NULL;
11505 /* If we're doing semantic analysis, then we'll call pushdecl
11506 for each of these. We must do them in reverse order so that
11507 they end in the correct forward order. */
11508 specparms = nreverse (specparms);
11510 for (parm = specparms; parm; parm = next)
11512 next = TREE_CHAIN (parm);
11513 if (TREE_CODE (parm) == PARM_DECL)
11515 if (DECL_NAME (parm) == NULL_TREE
11516 || TREE_CODE (parm) != VOID_TYPE)
11519 error ("parameter %qD declared void", parm);
11523 /* If we find an enum constant or a type tag,
11524 put it aside for the moment. */
11525 TREE_CHAIN (parm) = NULL_TREE;
11526 nonparms = chainon (nonparms, parm);
11530 /* Get the decls in their original chain order and record in the
11531 function. This is all and only the PARM_DECLs that were
11532 pushed into scope by the loop above. */
11533 DECL_ARGUMENTS (fndecl) = getdecls ();
11536 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11538 /* Now store the final chain of decls for the arguments
11539 as the decl-chain of the current lexical scope.
11540 Put the enumerators in as well, at the front so that
11541 DECL_ARGUMENTS is not modified. */
11542 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11544 if (use_eh_spec_block (current_function_decl))
11545 current_eh_spec_block = begin_eh_spec_block ();
11549 /* We have finished doing semantic analysis on DECL, but have not yet
11550 generated RTL for its body. Save away our current state, so that
11551 when we want to generate RTL later we know what to do. */
11554 save_function_data (tree decl)
11556 struct language_function *f;
11558 /* Save the language-specific per-function data so that we can
11559 get it back when we really expand this function. */
11560 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11563 f = GGC_NEW (struct language_function);
11564 memcpy (f, cp_function_chain, sizeof (struct language_function));
11565 DECL_SAVED_FUNCTION_DATA (decl) = f;
11567 /* Clear out the bits we don't need. */
11568 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11569 f->bindings = NULL;
11570 f->x_local_names = NULL;
11574 /* Set the return value of the constructor (if present). */
11577 finish_constructor_body (void)
11582 if (targetm.cxx.cdtor_returns_this ())
11584 /* Any return from a constructor will end up here. */
11585 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11587 val = DECL_ARGUMENTS (current_function_decl);
11588 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11589 DECL_RESULT (current_function_decl), val);
11590 /* Return the address of the object. */
11591 exprstmt = build_stmt (RETURN_EXPR, val);
11592 add_stmt (exprstmt);
11596 /* Do all the processing for the beginning of a destructor; set up the
11597 vtable pointers and cleanups for bases and members. */
11600 begin_destructor_body (void)
11602 tree compound_stmt;
11604 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11605 issued an error message. We still want to try to process the
11606 body of the function, but initialize_vtbl_ptrs will crash if
11607 TYPE_BINFO is NULL. */
11608 if (COMPLETE_TYPE_P (current_class_type))
11610 compound_stmt = begin_compound_stmt (0);
11611 /* Make all virtual function table pointers in non-virtual base
11612 classes point to CURRENT_CLASS_TYPE's virtual function
11614 initialize_vtbl_ptrs (current_class_ptr);
11615 finish_compound_stmt (compound_stmt);
11617 /* And insert cleanups for our bases and members so that they
11618 will be properly destroyed if we throw. */
11619 push_base_cleanups ();
11623 /* At the end of every destructor we generate code to delete the object if
11624 necessary. Do that now. */
11627 finish_destructor_body (void)
11631 /* Any return from a destructor will end up here; that way all base
11632 and member cleanups will be run when the function returns. */
11633 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11635 /* In a virtual destructor, we must call delete. */
11636 if (DECL_VIRTUAL_P (current_function_decl))
11639 tree virtual_size = cxx_sizeof (current_class_type);
11643 At the point of definition of a virtual destructor (including
11644 an implicit definition), non-placement operator delete shall
11645 be looked up in the scope of the destructor's class and if
11646 found shall be accessible and unambiguous. */
11647 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11649 /*global_p=*/false,
11650 /*placement=*/NULL_TREE,
11651 /*alloc_fn=*/NULL_TREE);
11653 if_stmt = begin_if_stmt ();
11654 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11655 current_in_charge_parm,
11658 finish_expr_stmt (exprstmt);
11659 finish_then_clause (if_stmt);
11660 finish_if_stmt (if_stmt);
11663 if (targetm.cxx.cdtor_returns_this ())
11667 val = DECL_ARGUMENTS (current_function_decl);
11668 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11669 DECL_RESULT (current_function_decl), val);
11670 /* Return the address of the object. */
11671 exprstmt = build_stmt (RETURN_EXPR, val);
11672 add_stmt (exprstmt);
11676 /* Do the necessary processing for the beginning of a function body, which
11677 in this case includes member-initializers, but not the catch clauses of
11678 a function-try-block. Currently, this means opening a binding level
11679 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11682 begin_function_body (void)
11686 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11689 if (processing_template_decl)
11690 /* Do nothing now. */;
11692 /* Always keep the BLOCK node associated with the outermost pair of
11693 curly braces of a function. These are needed for correct
11694 operation of dwarfout.c. */
11695 keep_next_level (true);
11697 stmt = begin_compound_stmt (BCS_FN_BODY);
11699 if (processing_template_decl)
11700 /* Do nothing now. */;
11701 else if (DECL_DESTRUCTOR_P (current_function_decl))
11702 begin_destructor_body ();
11707 /* Do the processing for the end of a function body. Currently, this means
11708 closing out the cleanups for fully-constructed bases and members, and in
11709 the case of the destructor, deleting the object if desired. Again, this
11710 is only meaningful for [cd]tors, since they are the only functions where
11711 there is a significant distinction between the main body and any
11712 function catch clauses. Handling, say, main() return semantics here
11713 would be wrong, as flowing off the end of a function catch clause for
11714 main() would also need to return 0. */
11717 finish_function_body (tree compstmt)
11719 if (compstmt == NULL_TREE)
11722 /* Close the block. */
11723 finish_compound_stmt (compstmt);
11725 if (processing_template_decl)
11726 /* Do nothing now. */;
11727 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11728 finish_constructor_body ();
11729 else if (DECL_DESTRUCTOR_P (current_function_decl))
11730 finish_destructor_body ();
11733 /* Given a function, returns the BLOCK corresponding to the outermost level
11734 of curly braces, skipping the artificial block created for constructor
11738 outer_curly_brace_block (tree fndecl)
11740 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11741 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11742 /* Skip the artificial function body block. */
11743 block = BLOCK_SUBBLOCKS (block);
11747 /* Finish up a function declaration and compile that function
11748 all the way to assembler language output. The free the storage
11749 for the function definition.
11751 FLAGS is a bitwise or of the following values:
11753 We just finished processing the body of an in-class inline
11754 function definition. (This processing will have taken place
11755 after the class definition is complete.) */
11758 finish_function (int flags)
11760 tree fndecl = current_function_decl;
11761 tree fntype, ctype = NULL_TREE;
11762 int inclass_inline = (flags & 2) != 0;
11765 /* When we get some parse errors, we can end up without a
11766 current_function_decl, so cope. */
11767 if (fndecl == NULL_TREE)
11768 return error_mark_node;
11770 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11771 && DECL_VIRTUAL_P (fndecl)
11772 && !processing_template_decl)
11774 tree fnclass = DECL_CONTEXT (fndecl);
11775 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11776 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11779 nested = function_depth > 1;
11780 fntype = TREE_TYPE (fndecl);
11782 /* TREE_READONLY (fndecl) = 1;
11783 This caused &foo to be of type ptr-to-const-function
11784 which then got a warning when stored in a ptr-to-function variable. */
11786 gcc_assert (building_stmt_tree ());
11787 /* The current function is being defined, so its DECL_INITIAL should
11788 be set, and unless there's a multiple definition, it should be
11789 error_mark_node. */
11790 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11792 /* For a cloned function, we've already got all the code we need;
11793 there's no need to add any extra bits. */
11794 if (!DECL_CLONED_FUNCTION_P (fndecl))
11796 if (DECL_MAIN_P (current_function_decl))
11800 /* Make it so that `main' always returns 0 by default (or
11803 stmt = finish_return_stmt (integer_one_node);
11805 stmt = finish_return_stmt (integer_zero_node);
11807 /* Hack. We don't want the middle-end to warn that this
11808 return is unreachable, so put the statement on the
11810 #ifdef USE_MAPPED_LOCATION
11812 location_t linezero = linemap_line_start (line_table, 0, 1);
11813 SET_EXPR_LOCATION (stmt, linezero);
11816 annotate_with_file_line (stmt, input_filename, 0);
11820 if (use_eh_spec_block (current_function_decl))
11821 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11822 (TREE_TYPE (current_function_decl)),
11823 current_eh_spec_block);
11826 /* If we're saving up tree structure, tie off the function now. */
11827 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11829 finish_fname_decls ();
11831 /* If this function can't throw any exceptions, remember that. */
11832 if (!processing_template_decl
11833 && !cp_function_chain->can_throw
11834 && !flag_non_call_exceptions
11835 && !DECL_REPLACEABLE_P (fndecl))
11836 TREE_NOTHROW (fndecl) = 1;
11838 /* This must come after expand_function_end because cleanups might
11839 have declarations (from inline functions) that need to go into
11840 this function's blocks. */
11842 /* If the current binding level isn't the outermost binding level
11843 for this function, either there is a bug, or we have experienced
11844 syntax errors and the statement tree is malformed. */
11845 if (current_binding_level->kind != sk_function_parms)
11847 /* Make sure we have already experienced errors. */
11848 gcc_assert (errorcount);
11850 /* Throw away the broken statement tree and extra binding
11852 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11854 while (current_binding_level->kind != sk_function_parms)
11856 if (current_binding_level->kind == sk_class)
11857 pop_nested_class ();
11859 poplevel (0, 0, 0);
11862 poplevel (1, 0, 1);
11864 /* Statements should always be full-expressions at the outermost set
11865 of curly braces for a function. */
11866 gcc_assert (stmts_are_full_exprs_p ());
11868 /* Set up the named return value optimization, if we can. Candidate
11869 variables are selected in check_return_expr. */
11870 if (current_function_return_value)
11872 tree r = current_function_return_value;
11875 if (r != error_mark_node
11876 /* This is only worth doing for fns that return in memory--and
11877 simpler, since we don't have to worry about promoted modes. */
11878 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11879 /* Only allow this for variables declared in the outer scope of
11880 the function so we know that their lifetime always ends with a
11881 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11882 we were to do this optimization in tree-ssa. */
11883 && (outer = outer_curly_brace_block (fndecl))
11884 && chain_member (r, BLOCK_VARS (outer)))
11885 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11887 current_function_return_value = NULL_TREE;
11890 /* Remember that we were in class scope. */
11891 if (current_class_name)
11892 ctype = current_class_type;
11894 /* Must mark the RESULT_DECL as being in this function. */
11895 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11897 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11898 to the FUNCTION_DECL node itself. */
11899 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11901 /* Save away current state, if appropriate. */
11902 if (!processing_template_decl)
11903 save_function_data (fndecl);
11905 /* Complain if there's just no return statement. */
11906 if (warn_return_type
11907 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11908 && !dependent_type_p (TREE_TYPE (fntype))
11909 && !current_function_returns_value && !current_function_returns_null
11910 /* Don't complain if we abort or throw. */
11911 && !current_function_returns_abnormally
11912 && !DECL_NAME (DECL_RESULT (fndecl))
11913 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11914 inline function, as we might never be compiled separately. */
11915 && (DECL_INLINE (fndecl) || processing_template_decl)
11916 /* Structor return values (if any) are set by the compiler. */
11917 && !DECL_CONSTRUCTOR_P (fndecl)
11918 && !DECL_DESTRUCTOR_P (fndecl))
11919 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11921 /* Store the end of the function, so that we get good line number
11922 info for the epilogue. */
11923 cfun->function_end_locus = input_location;
11925 /* Genericize before inlining. */
11926 if (!processing_template_decl)
11928 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11929 cp_genericize (fndecl);
11930 /* Clear out the bits we don't need. */
11931 f->x_current_class_ptr = NULL;
11932 f->x_current_class_ref = NULL;
11933 f->x_eh_spec_block = NULL;
11934 f->x_in_charge_parm = NULL;
11935 f->x_vtt_parm = NULL;
11936 f->x_return_value = NULL;
11937 f->bindings = NULL;
11938 f->extern_decl_map = NULL;
11940 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11941 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11943 /* Clear out the bits we don't need. */
11944 local_names = NULL;
11946 /* We're leaving the context of this function, so zap cfun. It's still in
11947 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11949 current_function_decl = NULL;
11951 /* If this is an in-class inline definition, we may have to pop the
11952 bindings for the template parameters that we added in
11953 maybe_begin_member_template_processing when start_function was
11955 if (inclass_inline)
11956 maybe_end_member_template_processing ();
11958 /* Leave the scope of the class. */
11960 pop_nested_class ();
11966 /* Let the error reporting routines know that we're outside a
11967 function. For a nested function, this value is used in
11968 cxx_pop_function_context and then reset via pop_function_context. */
11969 current_function_decl = NULL_TREE;
11974 /* Create the FUNCTION_DECL for a function definition.
11975 DECLSPECS and DECLARATOR are the parts of the declaration;
11976 they describe the return type and the name of the function,
11977 but twisted together in a fashion that parallels the syntax of C.
11979 This function creates a binding context for the function body
11980 as well as setting up the FUNCTION_DECL in current_function_decl.
11982 Returns a FUNCTION_DECL on success.
11984 If the DECLARATOR is not suitable for a function (it defines a datum
11985 instead), we return 0, which tells yyparse to report a parse error.
11987 May return void_type_node indicating that this method is actually
11988 a friend. See grokfield for more details.
11990 Came here with a `.pushlevel' .
11992 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11993 CHANGES TO CODE IN `grokfield'. */
11996 start_method (cp_decl_specifier_seq *declspecs,
11997 const cp_declarator *declarator, tree attrlist)
11999 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12002 if (fndecl == error_mark_node)
12003 return error_mark_node;
12005 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12007 error ("invalid member function declaration");
12008 return error_mark_node;
12012 cplus_decl_attributes (&fndecl, attrlist, 0);
12014 /* Pass friends other than inline friend functions back. */
12015 if (fndecl == void_type_node)
12018 if (DECL_IN_AGGR_P (fndecl))
12020 if (DECL_CONTEXT (fndecl)
12021 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12022 error ("%qD is already defined in class %qT", fndecl,
12023 DECL_CONTEXT (fndecl));
12024 return error_mark_node;
12027 check_template_shadow (fndecl);
12029 DECL_DECLARED_INLINE_P (fndecl) = 1;
12030 if (flag_default_inline)
12031 DECL_INLINE (fndecl) = 1;
12033 /* We process method specializations in finish_struct_1. */
12034 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12036 fndecl = push_template_decl (fndecl);
12037 if (fndecl == error_mark_node)
12041 if (! DECL_FRIEND_P (fndecl))
12043 if (TREE_CHAIN (fndecl))
12045 fndecl = copy_node (fndecl);
12046 TREE_CHAIN (fndecl) = NULL_TREE;
12050 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12052 /* Make a place for the parms. */
12053 begin_scope (sk_function_parms, fndecl);
12055 DECL_IN_AGGR_P (fndecl) = 1;
12059 /* Go through the motions of finishing a function definition.
12060 We don't compile this method until after the whole class has
12063 FINISH_METHOD must return something that looks as though it
12064 came from GROKFIELD (since we are defining a method, after all).
12066 This is called after parsing the body of the function definition.
12067 STMTS is the chain of statements that makes up the function body.
12069 DECL is the ..._DECL that `start_method' provided. */
12072 finish_method (tree decl)
12074 tree fndecl = decl;
12079 if (decl == void_type_node)
12082 old_initial = DECL_INITIAL (fndecl);
12084 /* Undo the level for the parms (from start_method).
12085 This is like poplevel, but it causes nothing to be
12086 saved. Saving information here confuses symbol-table
12087 output routines. Besides, this information will
12088 be correctly output when this method is actually
12091 /* Clear out the meanings of the local variables of this level;
12092 also record in each decl which block it belongs to. */
12094 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12096 if (DECL_NAME (link) != NULL_TREE)
12097 pop_binding (DECL_NAME (link), link);
12098 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12099 DECL_CONTEXT (link) = NULL_TREE;
12102 poplevel (0, 0, 0);
12104 DECL_INITIAL (fndecl) = old_initial;
12106 /* We used to check if the context of FNDECL was different from
12107 current_class_type as another way to get inside here. This didn't work
12108 for String.cc in libg++. */
12109 if (DECL_FRIEND_P (fndecl))
12111 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12113 decl = void_type_node;
12120 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12121 we can lay it out later, when and if its type becomes complete. */
12124 maybe_register_incomplete_var (tree var)
12126 gcc_assert (TREE_CODE (var) == VAR_DECL);
12128 /* Keep track of variables with incomplete types. */
12129 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12130 && DECL_EXTERNAL (var))
12132 tree inner_type = TREE_TYPE (var);
12134 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12135 inner_type = TREE_TYPE (inner_type);
12136 inner_type = TYPE_MAIN_VARIANT (inner_type);
12138 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12139 /* RTTI TD entries are created while defining the type_info. */
12140 || (TYPE_LANG_SPECIFIC (inner_type)
12141 && TYPE_BEING_DEFINED (inner_type)))
12142 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12146 /* Called when a class type (given by TYPE) is defined. If there are
12147 any existing VAR_DECLs whose type hsa been completed by this
12148 declaration, update them now. */
12151 complete_vars (tree type)
12153 tree *list = &incomplete_vars;
12155 gcc_assert (CLASS_TYPE_P (type));
12158 if (same_type_p (type, TREE_PURPOSE (*list)))
12160 tree var = TREE_VALUE (*list);
12161 tree type = TREE_TYPE (var);
12162 /* Complete the type of the variable. The VAR_DECL itself
12163 will be laid out in expand_expr. */
12164 complete_type (type);
12165 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12166 /* Remove this entry from the list. */
12167 *list = TREE_CHAIN (*list);
12170 list = &TREE_CHAIN (*list);
12173 /* Check for pending declarations which may have abstract type. */
12174 complete_type_check_abstract (type);
12177 /* If DECL is of a type which needs a cleanup, build and return an
12178 expression to perform that cleanup here. Return NULL_TREE if no
12179 cleanup need be done. */
12182 cxx_maybe_build_cleanup (tree decl)
12188 /* Assume no cleanup is required. */
12189 cleanup = NULL_TREE;
12191 if (error_operand_p (decl))
12194 /* Handle "__attribute__((cleanup))". We run the cleanup function
12195 before the destructor since the destructor is what actually
12196 terminates the lifetime of the object. */
12197 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12204 /* Get the name specified by the user for the cleanup function. */
12205 id = TREE_VALUE (TREE_VALUE (attr));
12206 /* Look up the name to find the cleanup function to call. It is
12207 important to use lookup_name here because that is what is
12208 used in c-common.c:handle_cleanup_attribute when performing
12209 initial checks on the attribute. Note that those checks
12210 include ensuring that the function found is not an overloaded
12211 function, or an object with an overloaded call operator,
12212 etc.; we can rely on the fact that the functionfound is an
12213 ordinary FUNCTION_DECL. */
12214 fn = lookup_name (id);
12215 arg = build_address (decl);
12217 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
12220 /* Handle ordinary C++ destructors. */
12221 type = TREE_TYPE (decl);
12222 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12224 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12225 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12226 && CLASSTYPE_VBASECLASSES (type));
12230 if (TREE_CODE (type) == ARRAY_TYPE)
12233 addr = build_address (decl);
12235 /* Optimize for space over speed here. */
12236 if (!has_vbases || flag_expensive_optimizations)
12237 flags |= LOOKUP_NONVIRTUAL;
12239 call = build_delete (TREE_TYPE (addr), addr,
12240 sfk_complete_destructor, flags, 0);
12242 cleanup = build_compound_expr (cleanup, call);
12250 /* When a stmt has been parsed, this function is called. */
12257 /* DECL was originally constructed as a non-static member function,
12258 but turned out to be static. Update it accordingly. */
12261 revert_static_member_fn (tree decl)
12264 tree function = TREE_TYPE (decl);
12265 tree args = TYPE_ARG_TYPES (function);
12267 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12268 != TYPE_UNQUALIFIED)
12269 error ("static member function %q#D declared with type qualifiers", decl);
12271 args = TREE_CHAIN (args);
12272 tmp = build_function_type (TREE_TYPE (function), args);
12273 tmp = build_qualified_type (tmp, cp_type_quals (function));
12274 tmp = build_exception_variant (tmp,
12275 TYPE_RAISES_EXCEPTIONS (function));
12276 TREE_TYPE (decl) = tmp;
12277 if (DECL_ARGUMENTS (decl))
12278 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12279 DECL_STATIC_FUNCTION_P (decl) = 1;
12282 /* Initialize the variables used during compilation of a C++
12286 cxx_push_function_context (struct function * f)
12288 struct language_function *p = GGC_CNEW (struct language_function);
12291 /* Whenever we start a new function, we destroy temporaries in the
12293 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12299 if (DECL_SAVED_FUNCTION_DATA (fn))
12301 /* If we already parsed this function, and we're just expanding it
12302 now, restore saved state. */
12303 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
12305 /* We don't need the saved data anymore. Unless this is an inline
12306 function; we need the named return value info for
12307 declare_return_variable. */
12308 if (! DECL_INLINE (fn))
12309 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
12314 /* Free the language-specific parts of F, now that we've finished
12315 compiling the function. */
12318 cxx_pop_function_context (struct function * f)
12323 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12324 one of the language-independent trees. */
12326 enum cp_tree_node_structure_enum
12327 cp_tree_node_structure (union lang_tree_node * t)
12329 switch (TREE_CODE (&t->generic))
12331 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12332 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12333 case OVERLOAD: return TS_CP_OVERLOAD;
12334 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12335 case PTRMEM_CST: return TS_CP_PTRMEM;
12336 case BASELINK: return TS_CP_BASELINK;
12337 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12338 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12339 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12340 default: return TS_CP_GENERIC;
12344 /* Build the void_list_node (void_type_node having been created). */
12346 build_void_list_node (void)
12348 tree t = build_tree_list (NULL_TREE, void_type_node);
12353 cp_missing_noreturn_ok_p (tree decl)
12355 /* A missing noreturn is ok for the `main' function. */
12356 return DECL_MAIN_P (decl);
12359 /* Return the COMDAT group into which DECL should be placed. */
12362 cxx_comdat_group (tree decl)
12366 /* Virtual tables, construction virtual tables, and virtual table
12367 tables all go in a single COMDAT group, named after the primary
12369 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12370 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12371 /* For all other DECLs, the COMDAT group is the mangled name of the
12372 declaration itself. */
12375 while (DECL_THUNK_P (decl))
12377 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12378 into the same section as the target function. In that case
12379 we must return target's name. */
12380 tree target = THUNK_TARGET (decl);
12381 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12382 && DECL_SECTION_NAME (target) != NULL
12383 && DECL_ONE_ONLY (target))
12388 name = DECL_ASSEMBLER_NAME (decl);
12391 return IDENTIFIER_POINTER (name);
12394 #include "gt-cp-decl.h"