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 location = input_location; /* FIXME want (input_filename, (line)0) */
361 /* Avoid crashing later. */
362 define_label (location, DECL_NAME (label));
365 warn_for_unused_label (label);
368 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
371 /* At the end of a function, all labels declared within the function
372 go out of scope. BLOCK is the top-level block for the
376 pop_labels_1 (void **slot, void *data)
378 struct named_label_entry *ent = (struct named_label_entry *) *slot;
379 tree block = (tree) data;
381 pop_label (ent->label_decl, NULL_TREE);
383 /* Put the labels into the "variables" of the top-level block,
384 so debugger can see them. */
385 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
386 BLOCK_VARS (block) = ent->label_decl;
388 htab_clear_slot (named_labels, slot);
394 pop_labels (tree block)
398 htab_traverse (named_labels, pop_labels_1, block);
403 /* At the end of a block with local labels, restore the outer definition. */
406 pop_local_label (tree label, tree old_value)
408 struct named_label_entry dummy;
411 pop_label (label, old_value);
413 dummy.label_decl = label;
414 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
415 htab_clear_slot (named_labels, slot);
418 /* The following two routines are used to interface to Objective-C++.
419 The binding level is purposely treated as an opaque type. */
422 objc_get_current_scope (void)
424 return current_binding_level;
427 /* The following routine is used by the NeXT-style SJLJ exceptions;
428 variables get marked 'volatile' so as to not be clobbered by
429 _setjmp()/_longjmp() calls. All variables in the current scope,
430 as well as parent scopes up to (but not including) ENCLOSING_BLK
431 shall be thusly marked. */
434 objc_mark_locals_volatile (void *enclosing_blk)
436 struct cp_binding_level *scope;
438 for (scope = current_binding_level;
439 scope && scope != enclosing_blk;
440 scope = scope->level_chain)
444 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
445 objc_volatilize_decl (decl);
447 /* Do not climb up past the current function. */
448 if (scope->kind == sk_function_parms)
453 /* Update data for defined and undefined labels when leaving a scope. */
456 poplevel_named_label_1 (void **slot, void *data)
458 struct named_label_entry *ent = (struct named_label_entry *) *slot;
459 struct cp_binding_level *bl = (struct cp_binding_level *) data;
460 struct cp_binding_level *obl = bl->level_chain;
462 if (ent->binding_level == bl)
466 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
467 if (decl_jump_unsafe (decl))
468 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
470 ent->binding_level = obl;
471 ent->names_in_scope = obl->names;
475 ent->in_try_scope = true;
478 ent->in_catch_scope = true;
481 ent->in_omp_scope = true;
489 struct named_label_use_entry *use;
491 for (use = ent->uses; use ; use = use->next)
492 if (use->binding_level == bl)
494 use->binding_level = obl;
495 use->names_in_scope = obl->names;
496 if (bl->kind == sk_omp)
497 use->in_omp_scope = true;
504 /* Exit a binding level.
505 Pop the level off, and restore the state of the identifier-decl mappings
506 that were in effect when this level was entered.
508 If KEEP == 1, this level had explicit declarations, so
509 and create a "block" (a BLOCK node) for the level
510 to record its declarations and subblocks for symbol table output.
512 If FUNCTIONBODY is nonzero, this level is the body of a function,
513 so create a block as if KEEP were set and also clear out all
516 If REVERSE is nonzero, reverse the order of decls before putting
517 them into the BLOCK. */
520 poplevel (int keep, int reverse, int functionbody)
523 /* The chain of decls was accumulated in reverse order.
524 Put it into forward order, just for cleanliness. */
526 int tmp = functionbody;
527 int real_functionbody;
531 int leaving_for_scope;
534 timevar_push (TV_NAME_LOOKUP);
539 gcc_assert (current_binding_level->kind != sk_class);
541 real_functionbody = (current_binding_level->kind == sk_cleanup
542 ? ((functionbody = 0), tmp) : functionbody);
543 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
545 gcc_assert (!VEC_length(cp_class_binding,
546 current_binding_level->class_shadowed));
548 /* We used to use KEEP == 2 to indicate that the new block should go
549 at the beginning of the list of blocks at this binding level,
550 rather than the end. This hack is no longer used. */
551 gcc_assert (keep == 0 || keep == 1);
553 if (current_binding_level->keep)
556 /* Any uses of undefined labels, and any defined labels, now operate
557 under constraints of next binding contour. */
558 if (cfun && !functionbody && named_labels)
559 htab_traverse (named_labels, poplevel_named_label_1,
560 current_binding_level);
562 /* Get the decls in the order they were written.
563 Usually current_binding_level->names is in reverse order.
564 But parameter decls were previously put in forward order. */
567 current_binding_level->names
568 = decls = nreverse (current_binding_level->names);
570 decls = current_binding_level->names;
572 /* If there were any declarations or structure tags in that level,
573 or if this level is a function body,
574 create a BLOCK to record them for the life of this function. */
576 if (keep == 1 || functionbody)
577 block = make_node (BLOCK);
578 if (block != NULL_TREE)
580 BLOCK_VARS (block) = decls;
581 BLOCK_SUBBLOCKS (block) = subblocks;
584 /* In each subblock, record that this is its superior. */
586 for (link = subblocks; link; link = BLOCK_CHAIN (link))
587 BLOCK_SUPERCONTEXT (link) = block;
589 /* We still support the old for-scope rules, whereby the variables
590 in a for-init statement were in scope after the for-statement
591 ended. We only use the new rules if flag_new_for_scope is
594 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
596 /* Before we remove the declarations first check for unused variables. */
597 if (warn_unused_variable
598 && !processing_template_decl)
599 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
600 if (TREE_CODE (decl) == VAR_DECL
601 && ! TREE_USED (decl)
602 && ! DECL_IN_SYSTEM_HEADER (decl)
603 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
604 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
606 /* Remove declarations for all the DECLs in this level. */
607 for (link = decls; link; link = TREE_CHAIN (link))
609 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
612 tree name = DECL_NAME (link);
616 ob = outer_binding (name,
617 IDENTIFIER_BINDING (name),
620 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
622 ns_binding = NULL_TREE;
624 if (ob && ob->scope == current_binding_level->level_chain)
625 /* We have something like:
630 and we are leaving the `for' scope. There's no reason to
631 keep the binding of the inner `i' in this case. */
632 pop_binding (name, link);
633 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
634 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
635 /* Here, we have something like:
643 We must pop the for-scope binding so we know what's a
644 type and what isn't. */
645 pop_binding (name, link);
648 /* Mark this VAR_DECL as dead so that we can tell we left it
649 there only for backward compatibility. */
650 DECL_DEAD_FOR_LOCAL (link) = 1;
652 /* Keep track of what should have happened when we
653 popped the binding. */
656 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
657 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
660 /* Add it to the list of dead variables in the next
661 outermost binding to that we can remove these when we
662 leave that binding. */
663 current_binding_level->level_chain->dead_vars_from_for
664 = tree_cons (NULL_TREE, link,
665 current_binding_level->level_chain->
668 /* Although we don't pop the cxx_binding, we do clear
669 its SCOPE since the scope is going away now. */
670 IDENTIFIER_BINDING (name)->scope
671 = current_binding_level->level_chain;
678 /* Remove the binding. */
681 if (TREE_CODE (decl) == TREE_LIST)
682 decl = TREE_VALUE (decl);
685 if (TREE_CODE (name) == OVERLOAD)
686 name = OVL_FUNCTION (name);
688 gcc_assert (DECL_P (name));
689 pop_binding (DECL_NAME (name), decl);
693 /* Remove declarations for any `for' variables from inner scopes
694 that we kept around. */
695 for (link = current_binding_level->dead_vars_from_for;
696 link; link = TREE_CHAIN (link))
697 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
699 /* Restore the IDENTIFIER_TYPE_VALUEs. */
700 for (link = current_binding_level->type_shadowed;
701 link; link = TREE_CHAIN (link))
702 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
704 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
705 for (link = current_binding_level->shadowed_labels;
707 link = TREE_CHAIN (link))
708 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
710 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
711 list if a `using' declaration put them there. The debugging
712 back ends won't understand OVERLOAD, so we remove them here.
713 Because the BLOCK_VARS are (temporarily) shared with
714 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
715 popped all the bindings. */
720 for (d = &BLOCK_VARS (block); *d; )
722 if (TREE_CODE (*d) == TREE_LIST)
723 *d = TREE_CHAIN (*d);
725 d = &TREE_CHAIN (*d);
729 /* If the level being exited is the top level of a function,
730 check over all the labels. */
733 /* Since this is the top level block of a function, the vars are
734 the function's parameters. Don't leave them in the BLOCK
735 because they are found in the FUNCTION_DECL instead. */
736 BLOCK_VARS (block) = 0;
740 kind = current_binding_level->kind;
741 if (kind == sk_cleanup)
745 /* If this is a temporary binding created for a cleanup, then we'll
746 have pushed a statement list level. Pop that, create a new
747 BIND_EXPR for the block, and insert it into the stream. */
748 stmt = pop_stmt_list (current_binding_level->statement_list);
749 stmt = c_build_bind_expr (block, stmt);
756 /* The current function is being defined, so its DECL_INITIAL
757 should be error_mark_node. */
758 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
759 DECL_INITIAL (current_function_decl) = block;
762 current_binding_level->blocks
763 = chainon (current_binding_level->blocks, block);
765 /* If we did not make a block for the level just exited,
766 any blocks made for inner levels
767 (since they cannot be recorded as subblocks in that level)
768 must be carried forward so they will later become subblocks
769 of something else. */
771 current_binding_level->blocks
772 = chainon (current_binding_level->blocks, subblocks);
774 /* Each and every BLOCK node created here in `poplevel' is important
775 (e.g. for proper debugging information) so if we created one
776 earlier, mark it as "used". */
778 TREE_USED (block) = 1;
780 /* All temporary bindings created for cleanups are popped silently. */
781 if (kind == sk_cleanup)
784 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
787 /* Insert BLOCK at the end of the list of subblocks of the
788 current binding level. This is used when a BIND_EXPR is expanded,
789 to handle the BLOCK node inside the BIND_EXPR. */
792 insert_block (tree block)
794 TREE_USED (block) = 1;
795 current_binding_level->blocks
796 = chainon (current_binding_level->blocks, block);
799 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
800 itself, calling F for each. The DATA is passed to F as well. */
803 walk_namespaces_r (tree namespace, walk_namespaces_fn f, void* data)
806 tree current = NAMESPACE_LEVEL (namespace)->namespaces;
808 result |= (*f) (namespace, data);
810 for (; current; current = TREE_CHAIN (current))
811 result |= walk_namespaces_r (current, f, data);
816 /* Walk all the namespaces, calling F for each. The DATA is passed to
820 walk_namespaces (walk_namespaces_fn f, void* data)
822 return walk_namespaces_r (global_namespace, f, data);
825 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
826 DATA is non-NULL, this is the last time we will call
827 wrapup_global_declarations for this NAMESPACE. */
830 wrapup_globals_for_namespace (tree namespace, void* data)
832 struct cp_binding_level *level = NAMESPACE_LEVEL (namespace);
833 VEC(tree,gc) *statics = level->static_decls;
834 tree *vec = VEC_address (tree, statics);
835 int len = VEC_length (tree, statics);
836 int last_time = (data != 0);
840 check_global_declarations (vec, len);
841 emit_debug_global_declarations (vec, len);
845 /* Write out any globals that need to be output. */
846 return wrapup_global_declarations (vec, len);
850 /* In C++, you don't have to write `struct S' to refer to `S'; you
851 can just use `S'. We accomplish this by creating a TYPE_DECL as
852 if the user had written `typedef struct S S'. Create and return
853 the TYPE_DECL for TYPE. */
856 create_implicit_typedef (tree name, tree type)
860 decl = build_decl (TYPE_DECL, name, type);
861 DECL_ARTIFICIAL (decl) = 1;
862 /* There are other implicit type declarations, like the one *within*
863 a class that allows you to write `S::S'. We must distinguish
865 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
866 TYPE_NAME (type) = decl;
871 /* Remember a local name for name-mangling purposes. */
874 push_local_name (tree decl)
879 timevar_push (TV_NAME_LOOKUP);
881 name = DECL_NAME (decl);
883 nelts = VEC_length (tree, local_names);
884 for (i = 0; i < nelts; i++)
886 t = VEC_index (tree, local_names, i);
887 if (DECL_NAME (t) == name)
889 if (!DECL_LANG_SPECIFIC (decl))
890 retrofit_lang_decl (decl);
891 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
892 if (DECL_LANG_SPECIFIC (t))
893 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
895 DECL_DISCRIMINATOR (decl) = 1;
897 VEC_replace (tree, local_names, i, decl);
898 timevar_pop (TV_NAME_LOOKUP);
903 VEC_safe_push (tree, gc, local_names, decl);
904 timevar_pop (TV_NAME_LOOKUP);
907 /* Subroutine of duplicate_decls: return truthvalue of whether
908 or not types of these decls match.
910 For C++, we must compare the parameter list so that `int' can match
911 `int&' in a parameter position, but `int&' is not confused with
915 decls_match (tree newdecl, tree olddecl)
919 if (newdecl == olddecl)
922 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
923 /* If the two DECLs are not even the same kind of thing, we're not
924 interested in their types. */
927 if (TREE_CODE (newdecl) == FUNCTION_DECL)
929 tree f1 = TREE_TYPE (newdecl);
930 tree f2 = TREE_TYPE (olddecl);
931 tree p1 = TYPE_ARG_TYPES (f1);
932 tree p2 = TYPE_ARG_TYPES (f2);
934 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
935 && ! (DECL_EXTERN_C_P (newdecl)
936 && DECL_EXTERN_C_P (olddecl)))
939 if (TREE_CODE (f1) != TREE_CODE (f2))
942 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
944 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
945 && (DECL_BUILT_IN (olddecl)
946 #ifndef NO_IMPLICIT_EXTERN_C
947 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
948 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
952 types_match = self_promoting_args_p (p1);
953 if (p1 == void_list_node)
954 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
956 #ifndef NO_IMPLICIT_EXTERN_C
957 else if (p1 == NULL_TREE
958 && (DECL_EXTERN_C_P (olddecl)
959 && DECL_IN_SYSTEM_HEADER (olddecl)
960 && !DECL_CLASS_SCOPE_P (olddecl))
961 && (DECL_EXTERN_C_P (newdecl)
962 && DECL_IN_SYSTEM_HEADER (newdecl)
963 && !DECL_CLASS_SCOPE_P (newdecl)))
965 types_match = self_promoting_args_p (p2);
966 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
970 types_match = compparms (p1, p2);
975 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
977 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
978 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
981 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
982 DECL_TEMPLATE_PARMS (olddecl)))
985 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
986 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
987 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
989 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
990 DECL_TEMPLATE_RESULT (newdecl));
994 /* Need to check scope for variable declaration (VAR_DECL).
995 For typedef (TYPE_DECL), scope is ignored. */
996 if (TREE_CODE (newdecl) == VAR_DECL
997 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
999 Two declarations for an object with C language linkage
1000 with the same name (ignoring the namespace that qualify
1001 it) that appear in different namespace scopes refer to
1003 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1006 if (TREE_TYPE (newdecl) == error_mark_node)
1007 types_match = TREE_TYPE (olddecl) == error_mark_node;
1008 else if (TREE_TYPE (olddecl) == NULL_TREE)
1009 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1010 else if (TREE_TYPE (newdecl) == NULL_TREE)
1013 types_match = cp_comptypes (TREE_TYPE (newdecl),
1014 TREE_TYPE (olddecl),
1015 COMPARE_REDECLARATION);
1021 /* If NEWDECL is `static' and an `extern' was seen previously,
1022 warn about it. OLDDECL is the previous declaration.
1024 Note that this does not apply to the C++ case of declaring
1025 a variable `extern const' and then later `const'.
1027 Don't complain about built-in functions, since they are beyond
1028 the user's control. */
1031 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1035 if (TREE_CODE (newdecl) == TYPE_DECL
1036 || TREE_CODE (newdecl) == TEMPLATE_DECL
1037 || TREE_CODE (newdecl) == CONST_DECL
1038 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1041 /* Don't get confused by static member functions; that's a different
1043 if (TREE_CODE (newdecl) == FUNCTION_DECL
1044 && DECL_STATIC_FUNCTION_P (newdecl))
1047 /* If the old declaration was `static', or the new one isn't, then
1048 then everything is OK. */
1049 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1052 /* It's OK to declare a builtin function as `static'. */
1053 if (TREE_CODE (olddecl) == FUNCTION_DECL
1054 && DECL_ARTIFICIAL (olddecl))
1057 name = DECL_ASSEMBLER_NAME (newdecl);
1058 pedwarn ("%qD was declared %<extern%> and later %<static%>", newdecl);
1059 pedwarn ("previous declaration of %q+D", olddecl);
1062 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1063 function templates. If their exception specifications do not
1064 match, issue a diagnostic. */
1067 check_redeclaration_exception_specification (tree new_decl,
1072 tree new_exceptions;
1073 tree old_exceptions;
1075 new_type = TREE_TYPE (new_decl);
1076 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1077 old_type = TREE_TYPE (old_decl);
1078 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1082 If any declaration of a function has an exception-specification,
1083 all declarations, including the definition and an explicit
1084 specialization, of that function shall have an
1085 exception-specification with the same set of type-ids. */
1086 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1087 && ! DECL_IS_BUILTIN (old_decl)
1089 && !comp_except_specs (new_exceptions, old_exceptions,
1092 error ("declaration of %qF throws different exceptions", new_decl);
1093 error ("from previous declaration %q+F", old_decl);
1097 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1098 && lookup_attribute ("gnu_inline", \
1099 DECL_ATTRIBUTES (fn)))
1101 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1102 If the redeclaration is invalid, a diagnostic is issued, and the
1103 error_mark_node is returned. Otherwise, OLDDECL is returned.
1105 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1108 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1111 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1113 unsigned olddecl_uid = DECL_UID (olddecl);
1114 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1115 int new_defines_function = 0;
1118 if (newdecl == olddecl)
1121 types_match = decls_match (newdecl, olddecl);
1123 /* If either the type of the new decl or the type of the old decl is an
1124 error_mark_node, then that implies that we have already issued an
1125 error (earlier) for some bogus type specification, and in that case,
1126 it is rather pointless to harass the user with yet more error message
1127 about the same declaration, so just pretend the types match here. */
1128 if (TREE_TYPE (newdecl) == error_mark_node
1129 || TREE_TYPE (olddecl) == error_mark_node)
1130 return error_mark_node;
1132 if (DECL_P (olddecl)
1133 && TREE_CODE (newdecl) == FUNCTION_DECL
1134 && TREE_CODE (olddecl) == FUNCTION_DECL
1135 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1137 if (DECL_DECLARED_INLINE_P (newdecl)
1138 && DECL_UNINLINABLE (newdecl)
1139 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1140 /* Already warned elsewhere. */;
1141 else if (DECL_DECLARED_INLINE_P (olddecl)
1142 && DECL_UNINLINABLE (olddecl)
1143 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1144 /* Already warned. */;
1145 else if (DECL_DECLARED_INLINE_P (newdecl)
1146 && DECL_UNINLINABLE (olddecl)
1147 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1149 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1151 warning (OPT_Wattributes, "previous declaration of %q+D "
1152 "with attribute noinline", olddecl);
1154 else if (DECL_DECLARED_INLINE_P (olddecl)
1155 && DECL_UNINLINABLE (newdecl)
1156 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1158 warning (OPT_Wattributes, "function %q+D redeclared with "
1159 "attribute noinline", newdecl);
1160 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1165 /* Check for redeclaration and other discrepancies. */
1166 if (TREE_CODE (olddecl) == FUNCTION_DECL
1167 && DECL_ARTIFICIAL (olddecl))
1169 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1170 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1172 /* Avoid warnings redeclaring built-ins which have not been
1173 explicitly declared. */
1174 if (DECL_ANTICIPATED (olddecl))
1177 /* If you declare a built-in or predefined function name as static,
1178 the old definition is overridden, but optionally warn this was a
1179 bad choice of name. */
1180 if (! TREE_PUBLIC (newdecl))
1182 warning (OPT_Wshadow, "shadowing %s function %q#D",
1183 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1185 /* Discard the old built-in function. */
1188 /* If the built-in is not ansi, then programs can override
1189 it even globally without an error. */
1190 else if (! DECL_BUILT_IN (olddecl))
1191 warning (0, "library function %q#D redeclared as non-function %q#D",
1195 error ("declaration of %q#D", newdecl);
1196 error ("conflicts with built-in declaration %q#D",
1201 else if (!types_match)
1203 /* Avoid warnings redeclaring built-ins which have not been
1204 explicitly declared. */
1205 if (DECL_ANTICIPATED (olddecl))
1207 /* Deal with fileptr_type_node. FILE type is not known
1208 at the time we create the builtins. */
1211 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1212 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1214 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1217 else if (TREE_VALUE (t2) == fileptr_type_node)
1219 tree t = TREE_VALUE (t1);
1221 if (TREE_CODE (t) == POINTER_TYPE
1222 && TYPE_NAME (TREE_TYPE (t))
1223 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1224 == get_identifier ("FILE")
1225 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1227 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1229 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1230 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1231 types_match = decls_match (newdecl, olddecl);
1233 return duplicate_decls (newdecl, olddecl,
1235 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1238 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1241 else if ((DECL_EXTERN_C_P (newdecl)
1242 && DECL_EXTERN_C_P (olddecl))
1243 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1244 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1246 /* A near match; override the builtin. */
1248 if (TREE_PUBLIC (newdecl))
1250 warning (0, "new declaration %q#D", newdecl);
1251 warning (0, "ambiguates built-in declaration %q#D",
1255 warning (OPT_Wshadow, "shadowing %s function %q#D",
1256 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1260 /* Discard the old built-in function. */
1263 /* Replace the old RTL to avoid problems with inlining. */
1264 COPY_DECL_RTL (newdecl, olddecl);
1266 /* Even if the types match, prefer the new declarations type for
1267 built-ins which have not been explicitly declared, for
1268 exception lists, etc... */
1269 else if (DECL_ANTICIPATED (olddecl))
1271 tree type = TREE_TYPE (newdecl);
1272 tree attribs = (*targetm.merge_type_attributes)
1273 (TREE_TYPE (olddecl), type);
1275 type = cp_build_type_attribute_variant (type, attribs);
1276 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1279 /* If a function is explicitly declared "throw ()", propagate that to
1280 the corresponding builtin. */
1281 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1282 && DECL_ANTICIPATED (olddecl)
1283 && TREE_NOTHROW (newdecl)
1284 && !TREE_NOTHROW (olddecl)
1285 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1286 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1288 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1290 /* Whether or not the builtin can throw exceptions has no
1291 bearing on this declarator. */
1292 TREE_NOTHROW (olddecl) = 0;
1294 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1296 /* If a builtin function is redeclared as `static', merge
1297 the declarations, but make the original one static. */
1298 DECL_THIS_STATIC (olddecl) = 1;
1299 TREE_PUBLIC (olddecl) = 0;
1301 /* Make the old declaration consistent with the new one so
1302 that all remnants of the builtin-ness of this function
1303 will be banished. */
1304 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1305 COPY_DECL_RTL (newdecl, olddecl);
1308 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1310 /* C++ Standard, 3.3, clause 4:
1311 "[Note: a namespace name or a class template name must be unique
1312 in its declarative region (7.3.2, clause 14). ]" */
1313 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1314 && TREE_CODE (newdecl) != NAMESPACE_DECL
1315 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1316 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1317 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1318 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1320 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1321 && TREE_CODE (newdecl) != TYPE_DECL)
1322 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1323 && TREE_CODE (olddecl) != TYPE_DECL))
1325 /* We do nothing special here, because C++ does such nasty
1326 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1327 get shadowed, and know that if we need to find a TYPE_DECL
1328 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1329 slot of the identifier. */
1333 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1334 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1335 || (TREE_CODE (olddecl) == FUNCTION_DECL
1336 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1340 error ("%q#D redeclared as different kind of symbol", newdecl);
1341 if (TREE_CODE (olddecl) == TREE_LIST)
1342 olddecl = TREE_VALUE (olddecl);
1343 error ("previous declaration of %q+#D", olddecl);
1345 return error_mark_node;
1347 else if (!types_match)
1349 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1350 /* These are certainly not duplicate declarations; they're
1351 from different scopes. */
1354 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1356 /* The name of a class template may not be declared to refer to
1357 any other template, class, function, object, namespace, value,
1358 or type in the same scope. */
1359 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1360 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1362 error ("declaration of template %q#D", newdecl);
1363 error ("conflicts with previous declaration %q+#D", olddecl);
1365 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1366 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1367 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1368 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1369 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1370 DECL_TEMPLATE_PARMS (olddecl))
1371 /* Template functions can be disambiguated by
1373 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1374 TREE_TYPE (TREE_TYPE (olddecl))))
1376 error ("new declaration %q#D", newdecl);
1377 error ("ambiguates old declaration %q+#D", olddecl);
1381 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1383 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1385 error ("declaration of C function %q#D conflicts with",
1387 error ("previous declaration %q+#D here", olddecl);
1389 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1390 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1392 error ("new declaration %q#D", newdecl);
1393 error ("ambiguates old declaration %q+#D", olddecl);
1394 return error_mark_node;
1401 error ("conflicting declaration %q#D", newdecl);
1402 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1403 return error_mark_node;
1406 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1407 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1408 && (!DECL_TEMPLATE_INFO (newdecl)
1409 || (DECL_TI_TEMPLATE (newdecl)
1410 != DECL_TI_TEMPLATE (olddecl))))
1411 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1412 && (!DECL_TEMPLATE_INFO (olddecl)
1413 || (DECL_TI_TEMPLATE (olddecl)
1414 != DECL_TI_TEMPLATE (newdecl))))))
1415 /* It's OK to have a template specialization and a non-template
1416 with the same type, or to have specializations of two
1417 different templates with the same type. Note that if one is a
1418 specialization, and the other is an instantiation of the same
1419 template, that we do not exit at this point. That situation
1420 can occur if we instantiate a template class, and then
1421 specialize one of its methods. This situation is valid, but
1422 the declarations must be merged in the usual way. */
1424 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1425 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1426 && !DECL_USE_TEMPLATE (newdecl))
1427 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1428 && !DECL_USE_TEMPLATE (olddecl))))
1429 /* One of the declarations is a template instantiation, and the
1430 other is not a template at all. That's OK. */
1432 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1434 /* In [namespace.alias] we have:
1436 In a declarative region, a namespace-alias-definition can be
1437 used to redefine a namespace-alias declared in that declarative
1438 region to refer only to the namespace to which it already
1441 Therefore, if we encounter a second alias directive for the same
1442 alias, we can just ignore the second directive. */
1443 if (DECL_NAMESPACE_ALIAS (newdecl)
1444 && (DECL_NAMESPACE_ALIAS (newdecl)
1445 == DECL_NAMESPACE_ALIAS (olddecl)))
1447 /* [namespace.alias]
1449 A namespace-name or namespace-alias shall not be declared as
1450 the name of any other entity in the same declarative region.
1451 A namespace-name defined at global scope shall not be
1452 declared as the name of any other entity in any global scope
1454 error ("declaration of namespace %qD conflicts with", newdecl);
1455 error ("previous declaration of namespace %q+D here", olddecl);
1456 return error_mark_node;
1460 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1463 error (errmsg, newdecl);
1464 if (DECL_NAME (olddecl) != NULL_TREE)
1465 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1466 ? "%q+#D previously defined here"
1467 : "%q+#D previously declared here", olddecl);
1468 return error_mark_node;
1470 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1471 && DECL_INITIAL (olddecl) != NULL_TREE
1472 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1473 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1475 /* Prototype decl follows defn w/o prototype. */
1476 warning (0, "prototype for %q+#D", newdecl);
1477 warning (0, "%Jfollows non-prototype definition here", olddecl);
1479 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1480 || TREE_CODE (olddecl) == VAR_DECL)
1481 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1484 If two declarations of the same function or object
1485 specify different linkage-specifications ..., the program
1486 is ill-formed.... Except for functions with C++ linkage,
1487 a function declaration without a linkage specification
1488 shall not precede the first linkage specification for
1489 that function. A function can be declared without a
1490 linkage specification after an explicit linkage
1491 specification has been seen; the linkage explicitly
1492 specified in the earlier declaration is not affected by
1493 such a function declaration.
1495 DR 563 raises the question why the restrictions on
1496 functions should not also apply to objects. Older
1497 versions of G++ silently ignore the linkage-specification
1505 which is clearly wrong. Therefore, we now treat objects
1507 if (current_lang_depth () == 0)
1509 /* There is no explicit linkage-specification, so we use
1510 the linkage from the previous declaration. */
1511 if (!DECL_LANG_SPECIFIC (newdecl))
1512 retrofit_lang_decl (newdecl);
1513 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1517 error ("previous declaration of %q+#D with %qL linkage",
1518 olddecl, DECL_LANGUAGE (olddecl));
1519 error ("conflicts with new declaration with %qL linkage",
1520 DECL_LANGUAGE (newdecl));
1524 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1526 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1528 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1529 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1532 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1533 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1535 for (; t1 && t1 != void_list_node;
1536 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1537 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1539 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1542 pedwarn ("default argument given for parameter %d of %q#D",
1544 pedwarn ("after previous specification in %q+#D", olddecl);
1548 error ("default argument given for parameter %d of %q#D",
1550 error ("after previous specification in %q+#D",
1555 if (DECL_DECLARED_INLINE_P (newdecl)
1556 && ! DECL_DECLARED_INLINE_P (olddecl)
1557 && TREE_ADDRESSABLE (olddecl) && warn_inline)
1559 warning (0, "%q#D was used before it was declared inline", newdecl);
1560 warning (0, "%Jprevious non-inline declaration here", olddecl);
1565 /* Do not merge an implicit typedef with an explicit one. In:
1569 typedef class A A __attribute__ ((foo));
1571 the attribute should apply only to the typedef. */
1572 if (TREE_CODE (olddecl) == TYPE_DECL
1573 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1574 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1577 /* If new decl is `static' and an `extern' was seen previously,
1579 warn_extern_redeclared_static (newdecl, olddecl);
1581 /* We have committed to returning 1 at this point. */
1582 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1584 /* Now that functions must hold information normally held
1585 by field decls, there is extra work to do so that
1586 declaration information does not get destroyed during
1588 if (DECL_VINDEX (olddecl))
1589 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1590 if (DECL_CONTEXT (olddecl))
1591 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1592 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1593 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1594 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1595 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1596 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1597 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1598 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1599 SET_OVERLOADED_OPERATOR_CODE
1600 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1601 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1603 /* Optionally warn about more than one declaration for the same
1604 name, but don't warn about a function declaration followed by a
1606 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1607 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1608 /* Don't warn about extern decl followed by definition. */
1609 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1610 /* Don't warn about friends, let add_friend take care of it. */
1611 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1613 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1614 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1618 /* Deal with C++: must preserve virtual function table size. */
1619 if (TREE_CODE (olddecl) == TYPE_DECL)
1621 tree newtype = TREE_TYPE (newdecl);
1622 tree oldtype = TREE_TYPE (olddecl);
1624 if (newtype != error_mark_node && oldtype != error_mark_node
1625 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1626 CLASSTYPE_FRIEND_CLASSES (newtype)
1627 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1629 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1632 /* Copy all the DECL_... slots specified in the new decl
1633 except for any that we copy here from the old type. */
1634 DECL_ATTRIBUTES (newdecl)
1635 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1637 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1641 old_result = DECL_TEMPLATE_RESULT (olddecl);
1642 new_result = DECL_TEMPLATE_RESULT (newdecl);
1643 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1644 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1645 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1646 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1648 DECL_ATTRIBUTES (old_result)
1649 = (*targetm.merge_decl_attributes) (old_result, new_result);
1651 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1653 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1654 && DECL_INITIAL (new_result))
1656 if (DECL_INITIAL (old_result))
1658 DECL_INLINE (old_result) = 0;
1659 DECL_UNINLINABLE (old_result) = 1;
1663 DECL_INLINE (old_result) = DECL_INLINE (new_result);
1664 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1666 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1667 DECL_NOT_REALLY_EXTERN (old_result)
1668 = DECL_NOT_REALLY_EXTERN (new_result);
1669 DECL_INTERFACE_KNOWN (old_result)
1670 = DECL_INTERFACE_KNOWN (new_result);
1671 DECL_DECLARED_INLINE_P (old_result)
1672 = DECL_DECLARED_INLINE_P (new_result);
1673 DECL_DISREGARD_INLINE_LIMITS (old_result)
1674 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1679 DECL_INLINE (old_result)
1680 |= DECL_INLINE (new_result);
1681 DECL_DECLARED_INLINE_P (old_result)
1682 |= DECL_DECLARED_INLINE_P (new_result);
1683 DECL_DISREGARD_INLINE_LIMITS (old_result)
1684 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1685 check_redeclaration_exception_specification (newdecl, olddecl);
1689 /* If the new declaration is a definition, update the file and
1690 line information on the declaration, and also make
1691 the old declaration the same definition. */
1692 if (DECL_INITIAL (new_result) != NULL_TREE)
1694 DECL_SOURCE_LOCATION (olddecl)
1695 = DECL_SOURCE_LOCATION (old_result)
1696 = DECL_SOURCE_LOCATION (newdecl);
1697 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1698 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1699 DECL_ARGUMENTS (old_result)
1700 = DECL_ARGUMENTS (new_result);
1708 /* Automatically handles default parameters. */
1709 tree oldtype = TREE_TYPE (olddecl);
1712 /* Merge the data types specified in the two decls. */
1713 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1715 /* If merge_types produces a non-typedef type, just use the old type. */
1716 if (TREE_CODE (newdecl) == TYPE_DECL
1717 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1720 if (TREE_CODE (newdecl) == VAR_DECL)
1722 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1723 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1724 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1725 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1726 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1727 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1729 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1730 if (DECL_LANG_SPECIFIC (olddecl)
1731 && CP_DECL_THREADPRIVATE_P (olddecl))
1733 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1734 if (!DECL_LANG_SPECIFIC (newdecl))
1735 retrofit_lang_decl (newdecl);
1737 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1738 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1742 /* Do this after calling `merge_types' so that default
1743 parameters don't confuse us. */
1744 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1745 check_redeclaration_exception_specification (newdecl, olddecl);
1746 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1748 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1749 check_default_args (newdecl);
1751 /* Lay the type out, unless already done. */
1752 if (! same_type_p (newtype, oldtype)
1753 && TREE_TYPE (newdecl) != error_mark_node
1754 && !(processing_template_decl && uses_template_parms (newdecl)))
1755 layout_type (TREE_TYPE (newdecl));
1757 if ((TREE_CODE (newdecl) == VAR_DECL
1758 || TREE_CODE (newdecl) == PARM_DECL
1759 || TREE_CODE (newdecl) == RESULT_DECL
1760 || TREE_CODE (newdecl) == FIELD_DECL
1761 || TREE_CODE (newdecl) == TYPE_DECL)
1762 && !(processing_template_decl && uses_template_parms (newdecl)))
1763 layout_decl (newdecl, 0);
1765 /* Merge the type qualifiers. */
1766 if (TREE_READONLY (newdecl))
1767 TREE_READONLY (olddecl) = 1;
1768 if (TREE_THIS_VOLATILE (newdecl))
1769 TREE_THIS_VOLATILE (olddecl) = 1;
1770 if (TREE_NOTHROW (newdecl))
1771 TREE_NOTHROW (olddecl) = 1;
1773 /* Merge deprecatedness. */
1774 if (TREE_DEPRECATED (newdecl))
1775 TREE_DEPRECATED (olddecl) = 1;
1777 /* Merge the initialization information. */
1778 if (DECL_INITIAL (newdecl) == NULL_TREE
1779 && DECL_INITIAL (olddecl) != NULL_TREE)
1781 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1782 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1783 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1784 && DECL_LANG_SPECIFIC (newdecl)
1785 && DECL_LANG_SPECIFIC (olddecl))
1787 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1788 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1792 /* Merge the section attribute.
1793 We want to issue an error if the sections conflict but that must be
1794 done later in decl_attributes since we are called before attributes
1796 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1797 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1799 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1801 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1802 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1803 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1804 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1805 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1806 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1807 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1808 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1809 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1810 /* Keep the old RTL. */
1811 COPY_DECL_RTL (olddecl, newdecl);
1813 else if (TREE_CODE (newdecl) == VAR_DECL
1814 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1816 /* Keep the old RTL. We cannot keep the old RTL if the old
1817 declaration was for an incomplete object and the new
1818 declaration is not since many attributes of the RTL will
1820 COPY_DECL_RTL (olddecl, newdecl);
1823 /* If cannot merge, then use the new type and qualifiers,
1824 and don't preserve the old rtl. */
1827 /* Clean out any memory we had of the old declaration. */
1828 tree oldstatic = value_member (olddecl, static_aggregates);
1830 TREE_VALUE (oldstatic) = error_mark_node;
1832 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1833 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1834 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1835 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1838 /* Merge the storage class information. */
1839 merge_weak (newdecl, olddecl);
1841 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1842 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1843 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1844 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1845 if (! DECL_EXTERNAL (olddecl))
1846 DECL_EXTERNAL (newdecl) = 0;
1848 new_template = NULL_TREE;
1849 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1851 bool new_redefines_gnu_inline = false;
1853 if (new_defines_function
1854 && ((DECL_INTERFACE_KNOWN (olddecl)
1855 && TREE_CODE (olddecl) == FUNCTION_DECL)
1856 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1857 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1858 == FUNCTION_DECL))))
1862 if (TREE_CODE (fn) == TEMPLATE_DECL)
1863 fn = DECL_TEMPLATE_RESULT (olddecl);
1865 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1868 if (!new_redefines_gnu_inline)
1870 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1871 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1872 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1874 DECL_TEMPLATE_INSTANTIATED (newdecl)
1875 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1877 /* If the OLDDECL is an instantiation and/or specialization,
1878 then the NEWDECL must be too. But, it may not yet be marked
1879 as such if the caller has created NEWDECL, but has not yet
1880 figured out that it is a redeclaration. */
1881 if (!DECL_USE_TEMPLATE (newdecl))
1882 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1884 /* Don't really know how much of the language-specific
1885 values we should copy from old to new. */
1886 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1887 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1888 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1889 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1890 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1891 if (DECL_TEMPLATE_INFO (newdecl))
1892 new_template = DECL_TI_TEMPLATE (newdecl);
1893 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1894 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1895 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1896 olddecl_friend = DECL_FRIEND_P (olddecl);
1897 hidden_friend = (DECL_ANTICIPATED (olddecl)
1898 && DECL_HIDDEN_FRIEND_P (olddecl)
1899 && newdecl_is_friend);
1901 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1902 if (TREE_CODE (newdecl) == FUNCTION_DECL
1903 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1905 DECL_BEFRIENDING_CLASSES (newdecl)
1906 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1907 DECL_BEFRIENDING_CLASSES (olddecl));
1908 /* DECL_THUNKS is only valid for virtual functions,
1909 otherwise it is a DECL_FRIEND_CONTEXT. */
1910 if (DECL_VIRTUAL_P (newdecl))
1911 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1915 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1917 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1918 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1920 /* If newdecl is not a specialization, then it is not a
1921 template-related function at all. And that means that we
1922 should have exited above, returning 0. */
1923 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1925 if (TREE_USED (olddecl))
1926 /* From [temp.expl.spec]:
1928 If a template, a member template or the member of a class
1929 template is explicitly specialized then that
1930 specialization shall be declared before the first use of
1931 that specialization that would cause an implicit
1932 instantiation to take place, in every translation unit in
1933 which such a use occurs. */
1934 error ("explicit specialization of %qD after first use",
1937 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1939 /* Don't propagate visibility from the template to the
1940 specialization here. We'll do that in determine_visibility if
1942 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1944 /* [temp.expl.spec/14] We don't inline explicit specialization
1945 just because the primary template says so. */
1947 else if (new_defines_function && DECL_INITIAL (olddecl))
1949 /* C++ is always in in unit-at-a-time mode, so we never
1950 inline re-defined extern inline functions. */
1951 DECL_INLINE (newdecl) = 0;
1952 DECL_UNINLINABLE (newdecl) = 1;
1956 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1957 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1959 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1961 /* If either decl says `inline', this fn is inline, unless
1962 its definition was passed already. */
1963 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == NULL_TREE)
1964 DECL_INLINE (olddecl) = 1;
1965 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1967 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1968 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1970 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1971 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1972 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1973 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1976 /* Preserve abstractness on cloned [cd]tors. */
1977 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1981 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1982 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1983 COPY_DECL_RTL (newdecl, olddecl);
1985 if (! types_match || new_defines_function)
1987 /* These need to be copied so that the names are available.
1988 Note that if the types do match, we'll preserve inline
1989 info and other bits, but if not, we won't. */
1990 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1991 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1993 if (new_defines_function)
1994 /* If defining a function declared with other language
1995 linkage, use the previously declared language linkage. */
1996 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1997 else if (types_match)
1999 /* If redeclaring a builtin function, and not a definition,
2000 it stays built in. */
2001 if (DECL_BUILT_IN (olddecl))
2003 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2004 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2005 /* If we're keeping the built-in definition, keep the rtl,
2006 regardless of declaration matches. */
2007 COPY_DECL_RTL (olddecl, newdecl);
2010 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2011 /* Don't clear out the arguments if we're redefining a function. */
2012 if (DECL_ARGUMENTS (olddecl))
2013 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2016 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2017 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2019 /* Now preserve various other info from the definition. */
2020 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2021 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2022 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2023 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2025 /* Warn about conflicting visibility specifications. */
2026 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2027 && DECL_VISIBILITY_SPECIFIED (newdecl)
2028 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2030 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2031 "because it", newdecl);
2032 warning (OPT_Wattributes, "%Jconflicts with previous "
2033 "declaration here", olddecl);
2035 /* Choose the declaration which specified visibility. */
2036 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2038 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2039 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2041 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2042 so keep this behavior. */
2043 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2045 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2046 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2049 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2050 with that from NEWDECL below. */
2051 if (DECL_LANG_SPECIFIC (olddecl))
2053 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2054 != DECL_LANG_SPECIFIC (newdecl));
2055 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2058 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2062 function_size = sizeof (struct tree_decl_common);
2064 memcpy ((char *) olddecl + sizeof (struct tree_common),
2065 (char *) newdecl + sizeof (struct tree_common),
2066 function_size - sizeof (struct tree_common));
2068 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2069 (char *) newdecl + sizeof (struct tree_decl_common),
2070 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2072 /* If newdecl is a template instantiation, it is possible that
2073 the following sequence of events has occurred:
2075 o A friend function was declared in a class template. The
2076 class template was instantiated.
2078 o The instantiation of the friend declaration was
2079 recorded on the instantiation list, and is newdecl.
2081 o Later, however, instantiate_class_template called pushdecl
2082 on the newdecl to perform name injection. But, pushdecl in
2083 turn called duplicate_decls when it discovered that another
2084 declaration of a global function with the same name already
2087 o Here, in duplicate_decls, we decided to clobber newdecl.
2089 If we're going to do that, we'd better make sure that
2090 olddecl, and not newdecl, is on the list of
2091 instantiations so that if we try to do the instantiation
2092 again we won't get the clobbered declaration. */
2093 reregister_specialization (newdecl,
2099 size_t size = tree_code_size (TREE_CODE (olddecl));
2100 memcpy ((char *) olddecl + sizeof (struct tree_common),
2101 (char *) newdecl + sizeof (struct tree_common),
2102 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2103 switch (TREE_CODE (olddecl))
2113 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2114 (char *) newdecl + sizeof (struct tree_decl_common),
2115 size - sizeof (struct tree_decl_common)
2116 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2120 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2121 (char *) newdecl + sizeof (struct tree_decl_common),
2122 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2123 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2127 DECL_UID (olddecl) = olddecl_uid;
2129 DECL_FRIEND_P (olddecl) = 1;
2132 DECL_ANTICIPATED (olddecl) = 1;
2133 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2136 /* NEWDECL contains the merged attribute lists.
2137 Update OLDDECL to be the same. */
2138 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2140 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2141 so that encode_section_info has a chance to look at the new decl
2142 flags and attributes. */
2143 if (DECL_RTL_SET_P (olddecl)
2144 && (TREE_CODE (olddecl) == FUNCTION_DECL
2145 || (TREE_CODE (olddecl) == VAR_DECL
2146 && TREE_STATIC (olddecl))))
2147 make_decl_rtl (olddecl);
2149 /* The NEWDECL will no longer be needed. Because every out-of-class
2150 declaration of a member results in a call to duplicate_decls,
2151 freeing these nodes represents in a significant savings. */
2157 /* Return zero if the declaration NEWDECL is valid
2158 when the declaration OLDDECL (assumed to be for the same name)
2159 has already been seen.
2160 Otherwise return an error message format string with a %s
2161 where the identifier should go. */
2164 redeclaration_error_message (tree newdecl, tree olddecl)
2166 if (TREE_CODE (newdecl) == TYPE_DECL)
2168 /* Because C++ can put things into name space for free,
2169 constructs like "typedef struct foo { ... } foo"
2170 would look like an erroneous redeclaration. */
2171 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2174 return "redefinition of %q#D";
2176 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2178 /* If this is a pure function, its olddecl will actually be
2179 the original initialization to `0' (which we force to call
2180 abort()). Don't complain about redefinition in this case. */
2181 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2182 && DECL_INITIAL (olddecl) == NULL_TREE)
2185 /* If both functions come from different namespaces, this is not
2186 a redeclaration - this is a conflict with a used function. */
2187 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2188 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2189 && ! decls_match (olddecl, newdecl))
2190 return "%qD conflicts with used function";
2192 /* We'll complain about linkage mismatches in
2193 warn_extern_redeclared_static. */
2195 /* Defining the same name twice is no good. */
2196 if (DECL_INITIAL (olddecl) != NULL_TREE
2197 && DECL_INITIAL (newdecl) != NULL_TREE)
2199 if (DECL_NAME (olddecl) == NULL_TREE)
2200 return "%q#D not declared in class";
2201 else if (!GNU_INLINE_P (olddecl)
2202 || GNU_INLINE_P (newdecl))
2203 return "redefinition of %q#D";
2206 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2208 bool olda = GNU_INLINE_P (olddecl);
2209 bool newa = GNU_INLINE_P (newdecl);
2214 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2216 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2222 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2226 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2228 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2229 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2230 return "redefinition of %q#D";
2234 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2235 || (DECL_TEMPLATE_RESULT (newdecl)
2236 == DECL_TEMPLATE_RESULT (olddecl)))
2239 nt = DECL_TEMPLATE_RESULT (newdecl);
2240 if (DECL_TEMPLATE_INFO (nt))
2241 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2242 ot = DECL_TEMPLATE_RESULT (olddecl);
2243 if (DECL_TEMPLATE_INFO (ot))
2244 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2245 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2246 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2247 return "redefinition of %q#D";
2249 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2251 bool olda = GNU_INLINE_P (ot);
2252 bool newa = GNU_INLINE_P (nt);
2257 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2259 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2263 /* Core issue #226 (C++0x):
2265 If a friend function template declaration specifies a
2266 default template-argument, that declaration shall be a
2267 definition and shall be the only declaration of the
2268 function template in the translation unit. */
2269 if ((cxx_dialect != cxx98)
2270 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2271 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2272 /*is_primary=*/1, /*is_partial=*/0,
2273 /*is_friend_decl=*/2))
2274 return "redeclaration of friend %q#D may not have default template arguments";
2278 else if (TREE_CODE (newdecl) == VAR_DECL
2279 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2280 && (! DECL_LANG_SPECIFIC (olddecl)
2281 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2282 || DECL_THREAD_LOCAL_P (newdecl)))
2284 /* Only variables can be thread-local, and all declarations must
2285 agree on this property. */
2286 if (DECL_THREAD_LOCAL_P (newdecl))
2287 return "thread-local declaration of %q#D follows "
2288 "non-thread-local declaration";
2290 return "non-thread-local declaration of %q#D follows "
2291 "thread-local declaration";
2293 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2295 /* The objects have been declared at namespace scope. If either
2296 is a member of an anonymous union, then this is an invalid
2297 redeclaration. For example:
2303 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2304 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2305 return "redeclaration of %q#D";
2306 /* If at least one declaration is a reference, there is no
2307 conflict. For example:
2313 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2315 /* Reject two definitions. */
2316 return "redefinition of %q#D";
2320 /* Objects declared with block scope: */
2321 /* Reject two definitions, and reject a definition
2322 together with an external reference. */
2323 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2324 return "redeclaration of %q#D";
2329 /* Hash and equality functions for the named_label table. */
2332 named_label_entry_hash (const void *data)
2334 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2335 return DECL_UID (ent->label_decl);
2339 named_label_entry_eq (const void *a, const void *b)
2341 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2342 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2343 return ent_a->label_decl == ent_b->label_decl;
2346 /* Create a new label, named ID. */
2349 make_label_decl (tree id, int local_p)
2351 struct named_label_entry *ent;
2355 decl = build_decl (LABEL_DECL, id, void_type_node);
2357 DECL_CONTEXT (decl) = current_function_decl;
2358 DECL_MODE (decl) = VOIDmode;
2359 C_DECLARED_LABEL_FLAG (decl) = local_p;
2361 /* Say where one reference is to the label, for the sake of the
2362 error if it is not defined. */
2363 DECL_SOURCE_LOCATION (decl) = input_location;
2365 /* Record the fact that this identifier is bound to this label. */
2366 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2368 /* Create the label htab for the function on demand. */
2370 named_labels = htab_create_ggc (13, named_label_entry_hash,
2371 named_label_entry_eq, NULL);
2373 /* Record this label on the list of labels used in this function.
2374 We do this before calling make_label_decl so that we get the
2375 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2376 ent = GGC_CNEW (struct named_label_entry);
2377 ent->label_decl = decl;
2379 slot = htab_find_slot (named_labels, ent, INSERT);
2380 gcc_assert (*slot == NULL);
2386 /* Look for a label named ID in the current function. If one cannot
2387 be found, create one. (We keep track of used, but undefined,
2388 labels, and complain about them at the end of a function.) */
2391 lookup_label (tree id)
2395 timevar_push (TV_NAME_LOOKUP);
2396 /* You can't use labels at global scope. */
2397 if (current_function_decl == NULL_TREE)
2399 error ("label %qE referenced outside of any function", id);
2400 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2403 /* See if we've already got this label. */
2404 decl = IDENTIFIER_LABEL_VALUE (id);
2405 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2406 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2408 decl = make_label_decl (id, /*local_p=*/0);
2409 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2412 /* Declare a local label named ID. */
2415 declare_local_label (tree id)
2419 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2420 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2421 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2422 current_binding_level->shadowed_labels);
2423 current_binding_level->shadowed_labels = shadow;
2425 decl = make_label_decl (id, /*local_p=*/1);
2426 TREE_VALUE (shadow) = decl;
2431 /* Returns nonzero if it is ill-formed to jump past the declaration of
2432 DECL. Returns 2 if it's also a real problem. */
2435 decl_jump_unsafe (tree decl)
2437 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2438 || TREE_TYPE (decl) == error_mark_node)
2441 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2442 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2445 if (pod_type_p (TREE_TYPE (decl)))
2448 /* The POD stuff is just pedantry; why should it matter if the class
2449 contains a field of pointer to member type? */
2453 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2456 identify_goto (tree decl, const location_t *locus)
2459 pedwarn ("jump to label %qD", decl);
2461 pedwarn ("jump to case label");
2463 pedwarn ("%H from here", locus);
2466 /* Check that a single previously seen jump to a newly defined label
2467 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2468 the jump context; NAMES are the names in scope in LEVEL at the jump
2469 context; LOCUS is the source position of the jump or 0. Returns
2470 true if all is well. */
2473 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2474 bool exited_omp, const location_t *locus)
2476 struct cp_binding_level *b;
2477 bool identified = false, saw_eh = false, saw_omp = false;
2481 identify_goto (decl, locus);
2482 error (" exits OpenMP structured block");
2483 identified = saw_omp = true;
2486 for (b = current_binding_level; b ; b = b->level_chain)
2488 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2490 for (new_decls = b->names; new_decls != old_decls;
2491 new_decls = TREE_CHAIN (new_decls))
2493 int problem = decl_jump_unsafe (new_decls);
2499 identify_goto (decl, locus);
2503 error (" crosses initialization of %q+#D", new_decls);
2505 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2510 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2514 identify_goto (decl, locus);
2517 if (b->kind == sk_try)
2518 error (" enters try block");
2520 error (" enters catch block");
2523 if (b->kind == sk_omp && !saw_omp)
2527 identify_goto (decl, locus);
2530 error (" enters OpenMP structured block");
2539 check_previous_goto (tree decl, struct named_label_use_entry *use)
2541 check_previous_goto_1 (decl, use->binding_level,
2542 use->names_in_scope, use->in_omp_scope,
2543 &use->o_goto_locus);
2547 check_switch_goto (struct cp_binding_level* level)
2549 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2552 /* Check that a new jump to a label DECL is OK. Called by
2553 finish_goto_stmt. */
2556 check_goto (tree decl)
2558 struct named_label_entry *ent, dummy;
2559 bool saw_catch = false, identified = false;
2562 /* We can't know where a computed goto is jumping.
2563 So we assume that it's OK. */
2564 if (TREE_CODE (decl) != LABEL_DECL)
2567 /* We didn't record any information about this label when we created it,
2568 and there's not much point since it's trivial to analyze as a return. */
2569 if (decl == cdtor_label)
2572 dummy.label_decl = decl;
2573 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2574 gcc_assert (ent != NULL);
2576 /* If the label hasn't been defined yet, defer checking. */
2577 if (! DECL_INITIAL (decl))
2579 struct named_label_use_entry *new_use;
2581 /* Don't bother creating another use if the last goto had the
2582 same data, and will therefore create the same set of errors. */
2584 && ent->uses->names_in_scope == current_binding_level->names)
2587 new_use = GGC_NEW (struct named_label_use_entry);
2588 new_use->binding_level = current_binding_level;
2589 new_use->names_in_scope = current_binding_level->names;
2590 new_use->o_goto_locus = input_location;
2591 new_use->in_omp_scope = false;
2593 new_use->next = ent->uses;
2594 ent->uses = new_use;
2598 if (ent->in_try_scope || ent->in_catch_scope
2599 || ent->in_omp_scope || ent->bad_decls)
2601 pedwarn ("jump to label %q+D", decl);
2602 pedwarn (" from here");
2606 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2608 tree b = TREE_VALUE (bad);
2609 int u = decl_jump_unsafe (b);
2611 if (u > 1 && DECL_ARTIFICIAL (b))
2613 /* Can't skip init of __exception_info. */
2614 error ("%J enters catch block", b);
2618 error (" skips initialization of %q+#D", b);
2620 pedwarn (" enters scope of non-POD %q+#D", b);
2623 if (ent->in_try_scope)
2624 error (" enters try block");
2625 else if (ent->in_catch_scope && !saw_catch)
2626 error (" enters catch block");
2628 if (ent->in_omp_scope)
2629 error (" enters OpenMP structured block");
2630 else if (flag_openmp)
2632 struct cp_binding_level *b;
2633 for (b = current_binding_level; b ; b = b->level_chain)
2635 if (b == ent->binding_level)
2637 if (b->kind == sk_omp)
2641 pedwarn ("jump to label %q+D", decl);
2642 pedwarn (" from here");
2645 error (" exits OpenMP structured block");
2652 /* Check that a return is ok wrt OpenMP structured blocks.
2653 Called by finish_return_stmt. Returns true if all is well. */
2656 check_omp_return (void)
2658 struct cp_binding_level *b;
2659 for (b = current_binding_level; b ; b = b->level_chain)
2660 if (b->kind == sk_omp)
2662 error ("invalid exit from OpenMP structured block");
2668 /* Define a label, specifying the location in the source file.
2669 Return the LABEL_DECL node for the label. */
2672 define_label (location_t location, tree name)
2674 struct named_label_entry *ent, dummy;
2675 struct cp_binding_level *p;
2678 timevar_push (TV_NAME_LOOKUP);
2680 decl = lookup_label (name);
2682 dummy.label_decl = decl;
2683 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2684 gcc_assert (ent != NULL);
2686 /* After labels, make any new cleanups in the function go into their
2687 own new (temporary) binding contour. */
2688 for (p = current_binding_level;
2689 p->kind != sk_function_parms;
2691 p->more_cleanups_ok = 0;
2693 if (name == get_identifier ("wchar_t"))
2694 pedwarn ("label named wchar_t");
2696 if (DECL_INITIAL (decl) != NULL_TREE)
2698 error ("duplicate label %qD", decl);
2699 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2703 struct named_label_use_entry *use;
2705 /* Mark label as having been defined. */
2706 DECL_INITIAL (decl) = error_mark_node;
2707 /* Say where in the source. */
2708 DECL_SOURCE_LOCATION (decl) = location;
2710 ent->binding_level = current_binding_level;
2711 ent->names_in_scope = current_binding_level->names;
2713 for (use = ent->uses; use ; use = use->next)
2714 check_previous_goto (decl, use);
2718 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2723 struct cp_binding_level *level;
2724 struct cp_switch *next;
2725 /* The SWITCH_STMT being built. */
2727 /* A splay-tree mapping the low element of a case range to the high
2728 element, or NULL_TREE if there is no high element. Used to
2729 determine whether or not a new case label duplicates an old case
2730 label. We need a tree, rather than simply a hash table, because
2731 of the GNU case range extension. */
2735 /* A stack of the currently active switch statements. The innermost
2736 switch statement is on the top of the stack. There is no need to
2737 mark the stack for garbage collection because it is only active
2738 during the processing of the body of a function, and we never
2739 collect at that point. */
2741 static struct cp_switch *switch_stack;
2743 /* Called right after a switch-statement condition is parsed.
2744 SWITCH_STMT is the switch statement being parsed. */
2747 push_switch (tree switch_stmt)
2749 struct cp_switch *p = XNEW (struct cp_switch);
2750 p->level = current_binding_level;
2751 p->next = switch_stack;
2752 p->switch_stmt = switch_stmt;
2753 p->cases = splay_tree_new (case_compare, NULL, NULL);
2760 struct cp_switch *cs = switch_stack;
2761 location_t switch_location;
2763 /* Emit warnings as needed. */
2764 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2765 switch_location = EXPR_LOCATION (cs->switch_stmt);
2767 switch_location = input_location;
2768 if (!processing_template_decl)
2769 c_do_switch_warnings (cs->cases, switch_location,
2770 SWITCH_STMT_TYPE (cs->switch_stmt),
2771 SWITCH_STMT_COND (cs->switch_stmt));
2773 splay_tree_delete (cs->cases);
2774 switch_stack = switch_stack->next;
2778 /* Note that we've seen a definition of a case label, and complain if this
2779 is a bad place for one. */
2782 finish_case_label (tree low_value, tree high_value)
2785 struct cp_binding_level *p;
2787 if (processing_template_decl)
2791 /* For templates, just add the case label; we'll do semantic
2792 analysis at instantiation-time. */
2793 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2794 return add_stmt (build_case_label (low_value, high_value, label));
2797 /* Find the condition on which this switch statement depends. */
2798 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2799 if (cond && TREE_CODE (cond) == TREE_LIST)
2800 cond = TREE_VALUE (cond);
2802 if (!check_switch_goto (switch_stack->level))
2803 return error_mark_node;
2805 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2806 low_value, high_value);
2808 /* After labels, make any new cleanups in the function go into their
2809 own new (temporary) binding contour. */
2810 for (p = current_binding_level;
2811 p->kind != sk_function_parms;
2813 p->more_cleanups_ok = 0;
2818 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2821 typename_hash (const void* k)
2824 const_tree const t = (const_tree) k;
2826 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2827 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2832 typedef struct typename_info {
2840 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2841 really of type `typename_info*' */
2844 typename_compare (const void * k1, const void * k2)
2846 const_tree const t1 = (const_tree) k1;
2847 const typename_info *const t2 = (const typename_info *) k2;
2849 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2850 && TYPE_CONTEXT (t1) == t2->scope
2851 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2852 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2853 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2856 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2857 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2859 Returns the new TYPENAME_TYPE. */
2861 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2864 build_typename_type (tree context, tree name, tree fullname,
2865 enum tag_types tag_type)
2873 if (typename_htab == NULL)
2874 typename_htab = htab_create_ggc (61, &typename_hash,
2875 &typename_compare, NULL);
2877 ti.scope = FROB_CONTEXT (context);
2879 ti.template_id = fullname;
2880 ti.enum_p = tag_type == enum_type;
2881 ti.class_p = (tag_type == class_type
2882 || tag_type == record_type
2883 || tag_type == union_type);
2884 hash = (htab_hash_pointer (ti.scope)
2885 ^ htab_hash_pointer (ti.name));
2887 /* See if we already have this type. */
2888 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2893 /* Build the TYPENAME_TYPE. */
2894 t = make_aggr_type (TYPENAME_TYPE);
2895 TYPE_CONTEXT (t) = ti.scope;
2896 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2897 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2898 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2900 /* Build the corresponding TYPE_DECL. */
2901 d = build_decl (TYPE_DECL, name, t);
2902 TYPE_NAME (TREE_TYPE (d)) = d;
2903 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2904 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2905 DECL_ARTIFICIAL (d) = 1;
2907 /* Store it in the hash table. */
2910 /* TYPENAME_TYPEs must always be compared structurally, because
2911 they may or may not resolve down to another type depending on
2912 the currently open classes. */
2913 SET_TYPE_STRUCTURAL_EQUALITY (t);
2919 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2920 provided to name the type. Returns an appropriate type, unless an
2921 error occurs, in which case error_mark_node is returned. If we
2922 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2923 return that, rather than the _TYPE it corresponds to, in other
2924 cases we look through the type decl. If TF_ERROR is set, complain
2925 about errors, otherwise be quiet. */
2928 make_typename_type (tree context, tree name, enum tag_types tag_type,
2929 tsubst_flags_t complain)
2935 if (name == error_mark_node
2936 || context == NULL_TREE
2937 || context == error_mark_node)
2938 return error_mark_node;
2942 if (!(TYPE_LANG_SPECIFIC (name)
2943 && (CLASSTYPE_IS_TEMPLATE (name)
2944 || CLASSTYPE_USE_TEMPLATE (name))))
2945 name = TYPE_IDENTIFIER (name);
2947 /* Create a TEMPLATE_ID_EXPR for the type. */
2948 name = build_nt (TEMPLATE_ID_EXPR,
2949 CLASSTYPE_TI_TEMPLATE (name),
2950 CLASSTYPE_TI_ARGS (name));
2952 else if (TREE_CODE (name) == TYPE_DECL)
2953 name = DECL_NAME (name);
2957 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2959 name = TREE_OPERAND (name, 0);
2960 if (TREE_CODE (name) == TEMPLATE_DECL)
2961 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2962 else if (TREE_CODE (name) == OVERLOAD)
2964 error ("%qD is not a type", name);
2965 return error_mark_node;
2968 if (TREE_CODE (name) == TEMPLATE_DECL)
2970 error ("%qD used without template parameters", name);
2971 return error_mark_node;
2973 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2974 gcc_assert (TYPE_P (context));
2976 /* When the CONTEXT is a dependent type, NAME could refer to a
2977 dependent base class of CONTEXT. So we cannot peek inside it,
2978 even if CONTEXT is a currently open scope. */
2979 if (dependent_type_p (context))
2980 return build_typename_type (context, name, fullname, tag_type);
2982 if (!IS_AGGR_TYPE (context))
2984 if (complain & tf_error)
2985 error ("%q#T is not a class", context);
2986 return error_mark_node;
2989 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2991 /* We should only set WANT_TYPE when we're a nested typename type.
2992 Then we can give better diagnostics if we find a non-type. */
2993 t = lookup_field (context, name, 0, /*want_type=*/true);
2996 if (complain & tf_error)
2997 error (want_template ? "no class template named %q#T in %q#T"
2998 : "no type named %q#T in %q#T", name, context);
2999 return error_mark_node;
3002 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3004 if (complain & tf_error)
3005 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3007 return error_mark_node;
3009 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3011 if (complain & tf_error)
3012 error ("%<typename %T::%D%> names %q#T, which is not a type",
3014 return error_mark_node;
3017 if (complain & tf_error)
3018 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3021 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3023 /*entering_scope=*/0,
3024 tf_warning_or_error | tf_user);
3026 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3032 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3033 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3034 in which case error_mark_node is returned.
3036 If PARM_LIST is non-NULL, also make sure that the template parameter
3037 list of TEMPLATE_DECL matches.
3039 If COMPLAIN zero, don't complain about any errors that occur. */
3042 make_unbound_class_template (tree context, tree name, tree parm_list,
3043 tsubst_flags_t complain)
3049 name = TYPE_IDENTIFIER (name);
3050 else if (DECL_P (name))
3051 name = DECL_NAME (name);
3052 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3054 if (!dependent_type_p (context)
3055 || currently_open_class (context))
3057 tree tmpl = NULL_TREE;
3059 if (IS_AGGR_TYPE (context))
3060 tmpl = lookup_field (context, name, 0, false);
3062 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3064 if (complain & tf_error)
3065 error ("no class template named %q#T in %q#T", name, context);
3066 return error_mark_node;
3070 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3072 if (complain & tf_error)
3074 error ("template parameters do not match template");
3075 error ("%q+D declared here", tmpl);
3077 return error_mark_node;
3080 if (complain & tf_error)
3081 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3086 /* Build the UNBOUND_CLASS_TEMPLATE. */
3087 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
3088 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3089 TREE_TYPE (t) = NULL_TREE;
3090 SET_TYPE_STRUCTURAL_EQUALITY (t);
3092 /* Build the corresponding TEMPLATE_DECL. */
3093 d = build_decl (TEMPLATE_DECL, name, t);
3094 TYPE_NAME (TREE_TYPE (d)) = d;
3095 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3096 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3097 DECL_ARTIFICIAL (d) = 1;
3098 DECL_TEMPLATE_PARMS (d) = parm_list;
3105 /* Push the declarations of builtin types into the namespace.
3106 RID_INDEX is the index of the builtin type in the array
3107 RID_POINTERS. NAME is the name used when looking up the builtin
3108 type. TYPE is the _TYPE node for the builtin type. */
3111 record_builtin_type (enum rid rid_index,
3115 tree rname = NULL_TREE, tname = NULL_TREE;
3116 tree tdecl = NULL_TREE;
3118 if ((int) rid_index < (int) RID_MAX)
3119 rname = ridpointers[(int) rid_index];
3121 tname = get_identifier (name);
3123 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3124 eliminated. Built-in types should not be looked up name; their
3125 names are keywords that the parser can recognize. However, there
3126 is code in c-common.c that uses identifier_global_value to look
3127 up built-in types by name. */
3130 tdecl = build_decl (TYPE_DECL, tname, type);
3131 DECL_ARTIFICIAL (tdecl) = 1;
3132 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3138 tdecl = build_decl (TYPE_DECL, rname, type);
3139 DECL_ARTIFICIAL (tdecl) = 1;
3141 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3144 if (!TYPE_NAME (type))
3145 TYPE_NAME (type) = tdecl;
3148 debug_hooks->type_decl (tdecl, 0);
3151 /* Record one of the standard Java types.
3152 * Declare it as having the given NAME.
3153 * If SIZE > 0, it is the size of one of the integral types;
3154 * otherwise it is the negative of the size of one of the other types. */
3157 record_builtin_java_type (const char* name, int size)
3161 type = make_signed_type (size);
3162 else if (size == -1)
3163 { /* "__java_boolean". */
3164 if ((TYPE_MODE (boolean_type_node)
3165 == smallest_mode_for_size (1, MODE_INT)))
3166 type = build_variant_type_copy (boolean_type_node);
3168 /* ppc-darwin has SImode bool, make jboolean a 1-bit
3169 integer type without boolean semantics there. */
3170 type = make_unsigned_type (1);
3172 else if (size > -32)
3173 { /* "__java_char". */
3174 type = make_unsigned_type (-size);
3177 { /* "__java_float" or ""__java_double". */
3178 type = make_node (REAL_TYPE);
3179 TYPE_PRECISION (type) = - size;
3182 record_builtin_type (RID_MAX, name, type);
3183 decl = TYPE_NAME (type);
3185 /* Suppress generate debug symbol entries for these types,
3186 since for normal C++ they are just clutter.
3187 However, push_lang_context undoes this if extern "Java" is seen. */
3188 DECL_IGNORED_P (decl) = 1;
3190 TYPE_FOR_JAVA (type) = 1;
3194 /* Push a type into the namespace so that the back ends ignore it. */
3197 record_unknown_type (tree type, const char* name)
3199 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3200 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3201 DECL_IGNORED_P (decl) = 1;
3202 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3203 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3204 TYPE_ALIGN (type) = 1;
3205 TYPE_USER_ALIGN (type) = 0;
3206 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3209 /* A string for which we should create an IDENTIFIER_NODE at
3212 typedef struct predefined_identifier
3214 /* The name of the identifier. */
3215 const char *const name;
3216 /* The place where the IDENTIFIER_NODE should be stored. */
3218 /* Nonzero if this is the name of a constructor or destructor. */
3219 const int ctor_or_dtor_p;
3220 } predefined_identifier;
3222 /* Create all the predefined identifiers. */
3225 initialize_predefined_identifiers (void)
3227 const predefined_identifier *pid;
3229 /* A table of identifiers to create at startup. */
3230 static const predefined_identifier predefined_identifiers[] = {
3231 { "C++", &lang_name_cplusplus, 0 },
3232 { "C", &lang_name_c, 0 },
3233 { "Java", &lang_name_java, 0 },
3234 /* Some of these names have a trailing space so that it is
3235 impossible for them to conflict with names written by users. */
3236 { "__ct ", &ctor_identifier, 1 },
3237 { "__base_ctor ", &base_ctor_identifier, 1 },
3238 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3239 { "__dt ", &dtor_identifier, 1 },
3240 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3241 { "__base_dtor ", &base_dtor_identifier, 1 },
3242 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3243 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3244 { "nelts", &nelts_identifier, 0 },
3245 { THIS_NAME, &this_identifier, 0 },
3246 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3247 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3248 { "_vptr", &vptr_identifier, 0 },
3249 { "__vtt_parm", &vtt_parm_identifier, 0 },
3250 { "::", &global_scope_name, 0 },
3251 { "std", &std_identifier, 0 },
3255 for (pid = predefined_identifiers; pid->name; ++pid)
3257 *pid->node = get_identifier (pid->name);
3258 if (pid->ctor_or_dtor_p)
3259 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3263 /* Create the predefined scalar types of C,
3264 and some nodes representing standard constants (0, 1, (void *)0).
3265 Initialize the global binding level.
3266 Make definitions for built-in primitive functions. */
3269 cxx_init_decl_processing (void)
3272 tree void_ftype_ptr;
3274 build_common_tree_nodes (flag_signed_char, false);
3276 /* Create all the identifiers we need. */
3277 initialize_predefined_identifiers ();
3279 /* Create the global variables. */
3280 push_to_top_level ();
3282 current_function_decl = NULL_TREE;
3283 current_binding_level = NULL;
3284 /* Enter the global namespace. */
3285 gcc_assert (global_namespace == NULL_TREE);
3286 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3288 TREE_PUBLIC (global_namespace) = 1;
3289 begin_scope (sk_namespace, global_namespace);
3291 current_lang_name = NULL_TREE;
3293 if (flag_visibility_ms_compat)
3294 default_visibility = VISIBILITY_HIDDEN;
3297 current_lang_name = lang_name_c;
3299 /* Create the `std' namespace. */
3300 push_namespace (std_identifier);
3301 std_node = current_namespace;
3304 c_common_nodes_and_builtins ();
3306 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3307 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3308 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3309 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3310 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3311 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3312 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3313 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3315 integer_two_node = build_int_cst (NULL_TREE, 2);
3316 integer_three_node = build_int_cst (NULL_TREE, 3);
3318 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3319 truthvalue_type_node = boolean_type_node;
3320 truthvalue_false_node = boolean_false_node;
3321 truthvalue_true_node = boolean_true_node;
3323 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3326 record_builtin_type (RID_MAX, NULL, string_type_node);
3329 delta_type_node = ptrdiff_type_node;
3330 vtable_index_type = ptrdiff_type_node;
3332 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3333 void_ftype = build_function_type (void_type_node, void_list_node);
3334 void_ftype_ptr = build_function_type (void_type_node,
3335 tree_cons (NULL_TREE,
3339 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3341 /* C++ extensions */
3343 unknown_type_node = make_node (UNKNOWN_TYPE);
3344 record_unknown_type (unknown_type_node, "unknown type");
3346 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3347 TREE_TYPE (unknown_type_node) = unknown_type_node;
3349 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3351 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3352 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3355 /* Make sure we get a unique function type, so we can give
3356 its pointer type a name. (This wins for gdb.) */
3357 tree vfunc_type = make_node (FUNCTION_TYPE);
3358 TREE_TYPE (vfunc_type) = integer_type_node;
3359 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3360 layout_type (vfunc_type);
3362 vtable_entry_type = build_pointer_type (vfunc_type);
3364 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3367 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3368 layout_type (vtbl_type_node);
3369 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3370 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3371 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3372 layout_type (vtbl_ptr_type_node);
3373 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3375 push_namespace (get_identifier ("__cxxabiv1"));
3376 abi_node = current_namespace;
3379 global_type_node = make_node (LANG_TYPE);
3380 record_unknown_type (global_type_node, "global type");
3383 current_lang_name = lang_name_cplusplus;
3387 tree bad_alloc_type_node;
3388 tree bad_alloc_decl;
3389 tree newtype, deltype;
3390 tree ptr_ftype_sizetype;
3392 push_namespace (std_identifier);
3393 bad_alloc_id = get_identifier ("bad_alloc");
3394 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3395 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3397 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3398 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3399 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3403 = build_function_type (ptr_type_node,
3404 tree_cons (NULL_TREE,
3407 newtype = build_exception_variant
3408 (ptr_ftype_sizetype, add_exception_specifier
3409 (NULL_TREE, bad_alloc_type_node, -1));
3410 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3411 push_cp_library_fn (NEW_EXPR, newtype);
3412 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3413 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3414 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3418 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3420 /* Perform other language dependent initializations. */
3421 init_class_processing ();
3422 init_rtti_processing ();
3424 if (flag_exceptions)
3425 init_exception_processing ();
3427 if (! supports_one_only ())
3430 make_fname_decl = cp_make_fname_decl;
3431 start_fname_decls ();
3433 /* Show we use EH for cleanups. */
3434 if (flag_exceptions)
3435 using_eh_for_cleanups ();
3438 /* Generate an initializer for a function naming variable from
3439 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3440 filled in with the type of the init. */
3443 cp_fname_init (const char* name, tree *type_p)
3445 tree domain = NULL_TREE;
3447 tree init = NULL_TREE;
3452 length = strlen (name);
3453 domain = build_index_type (size_int (length));
3454 init = build_string (length + 1, name);
3457 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3458 type = build_cplus_array_type (type, domain);
3463 TREE_TYPE (init) = type;
3465 init = error_mark_node;
3470 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3471 decl, NAME is the initialization string and TYPE_DEP indicates whether
3472 NAME depended on the type of the function. We make use of that to detect
3473 __PRETTY_FUNCTION__ inside a template fn. This is being done
3474 lazily at the point of first use, so we mustn't push the decl now. */
3477 cp_make_fname_decl (tree id, int type_dep)
3479 const char *const name = (type_dep && processing_template_decl
3480 ? NULL : fname_as_string (type_dep));
3482 tree init = cp_fname_init (name, &type);
3483 tree decl = build_decl (VAR_DECL, id, type);
3486 free (CONST_CAST (char *, name));
3488 /* As we're using pushdecl_with_scope, we must set the context. */
3489 DECL_CONTEXT (decl) = current_function_decl;
3490 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3492 TREE_STATIC (decl) = 1;
3493 TREE_READONLY (decl) = 1;
3494 DECL_ARTIFICIAL (decl) = 1;
3496 TREE_USED (decl) = 1;
3498 if (current_function_decl)
3500 struct cp_binding_level *b = current_binding_level;
3501 while (b->level_chain->kind != sk_function_parms)
3503 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3504 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3505 LOOKUP_ONLYCONVERTING);
3508 pushdecl_top_level_and_finish (decl, init);
3514 builtin_function_1 (tree decl, tree context)
3516 tree id = DECL_NAME (decl);
3517 const char *name = IDENTIFIER_POINTER (id);
3519 retrofit_lang_decl (decl);
3521 /* All nesting of C++ functions is lexical; there is never a "static
3522 chain" in the sense of GNU C nested functions. */
3523 DECL_NO_STATIC_CHAIN (decl) = 1;
3525 DECL_ARTIFICIAL (decl) = 1;
3526 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3527 SET_DECL_LANGUAGE (decl, lang_c);
3528 /* Runtime library routines are, by definition, available in an
3529 external shared object. */
3530 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3531 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3533 DECL_CONTEXT (decl) = context;
3537 /* A function in the user's namespace should have an explicit
3538 declaration before it is used. Mark the built-in function as
3539 anticipated but not actually declared. */
3540 if (name[0] != '_' || name[1] != '_')
3541 DECL_ANTICIPATED (decl) = 1;
3542 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3544 size_t len = strlen (name);
3546 /* Treat __*_chk fortification functions as anticipated as well,
3547 unless they are __builtin_*. */
3548 if (len > strlen ("___chk")
3549 && memcmp (name + len - strlen ("_chk"),
3550 "_chk", strlen ("_chk") + 1) == 0)
3551 DECL_ANTICIPATED (decl) = 1;
3558 cxx_builtin_function (tree decl)
3560 tree id = DECL_NAME (decl);
3561 const char *name = IDENTIFIER_POINTER (id);
3562 /* All builtins that don't begin with an '_' should additionally
3563 go in the 'std' namespace. */
3566 tree decl2 = copy_node(decl);
3567 push_namespace (std_identifier);
3568 builtin_function_1 (decl2, std_node);
3572 return builtin_function_1 (decl, NULL_TREE);
3575 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3576 function. Not called directly. */
3579 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3581 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3582 DECL_EXTERNAL (fn) = 1;
3583 TREE_PUBLIC (fn) = 1;
3584 DECL_ARTIFICIAL (fn) = 1;
3585 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3586 SET_DECL_LANGUAGE (fn, lang_c);
3587 /* Runtime library routines are, by definition, available in an
3588 external shared object. */
3589 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3590 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3594 /* Returns the _DECL for a library function with C linkage.
3595 We assume that such functions never throw; if this is incorrect,
3596 callers should unset TREE_NOTHROW. */
3599 build_library_fn (tree name, tree type)
3601 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3602 TREE_NOTHROW (fn) = 1;
3606 /* Returns the _DECL for a library function with C++ linkage. */
3609 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3611 tree fn = build_library_fn_1 (name, operator_code, type);
3612 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3613 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3614 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3618 /* Like build_library_fn, but takes a C string instead of an
3622 build_library_fn_ptr (const char* name, tree type)
3624 return build_library_fn (get_identifier (name), type);
3627 /* Like build_cp_library_fn, but takes a C string instead of an
3631 build_cp_library_fn_ptr (const char* name, tree type)
3633 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3636 /* Like build_library_fn, but also pushes the function so that we will
3637 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3640 push_library_fn (tree name, tree type)
3642 tree fn = build_library_fn (name, type);
3643 pushdecl_top_level (fn);
3647 /* Like build_cp_library_fn, but also pushes the function so that it
3648 will be found by normal lookup. */
3651 push_cp_library_fn (enum tree_code operator_code, tree type)
3653 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3660 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3664 push_void_library_fn (tree name, tree parmtypes)
3666 tree type = build_function_type (void_type_node, parmtypes);
3667 return push_library_fn (name, type);
3670 /* Like push_library_fn, but also note that this function throws
3671 and does not return. Used for __throw_foo and the like. */
3674 push_throw_library_fn (tree name, tree type)
3676 tree fn = push_library_fn (name, type);
3677 TREE_THIS_VOLATILE (fn) = 1;
3678 TREE_NOTHROW (fn) = 0;
3682 /* When we call finish_struct for an anonymous union, we create
3683 default copy constructors and such. But, an anonymous union
3684 shouldn't have such things; this function undoes the damage to the
3685 anonymous union type T.
3687 (The reason that we create the synthesized methods is that we don't
3688 distinguish `union { int i; }' from `typedef union { int i; } U'.
3689 The first is an anonymous union; the second is just an ordinary
3693 fixup_anonymous_aggr (tree t)
3697 /* Wipe out memory of synthesized methods. */
3698 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3699 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3700 TYPE_HAS_INIT_REF (t) = 0;
3701 TYPE_HAS_CONST_INIT_REF (t) = 0;
3702 TYPE_HAS_ASSIGN_REF (t) = 0;
3703 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3705 /* Splice the implicitly generated functions out of the TYPE_METHODS
3707 q = &TYPE_METHODS (t);
3710 if (DECL_ARTIFICIAL (*q))
3711 *q = TREE_CHAIN (*q);
3713 q = &TREE_CHAIN (*q);
3716 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3717 if (TYPE_METHODS (t))
3719 tree decl = TYPE_MAIN_DECL (t);
3721 if (TREE_CODE (t) != UNION_TYPE)
3722 error ("%Jan anonymous struct cannot have function members", decl);
3724 error ("%Jan anonymous union cannot have function members", decl);
3727 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3728 assignment operators (because they cannot have these methods themselves).
3729 For anonymous unions this is already checked because they are not allowed
3730 in any union, otherwise we have to check it. */
3731 if (TREE_CODE (t) != UNION_TYPE)
3735 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3736 if (TREE_CODE (field) == FIELD_DECL)
3738 type = TREE_TYPE (field);
3739 if (CLASS_TYPE_P (type))
3741 if (TYPE_NEEDS_CONSTRUCTING (type))
3742 error ("member %q+#D with constructor not allowed "
3743 "in anonymous aggregate", field);
3744 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3745 error ("member %q+#D with destructor not allowed "
3746 "in anonymous aggregate", field);
3747 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3748 error ("member %q+#D with copy assignment operator "
3749 "not allowed in anonymous aggregate", field);
3755 /* Make sure that a declaration with no declarator is well-formed, i.e.
3756 just declares a tagged type or anonymous union.
3758 Returns the type declared; or NULL_TREE if none. */
3761 check_tag_decl (cp_decl_specifier_seq *declspecs)
3763 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3764 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3765 /* If a class, struct, or enum type is declared by the DECLSPECS
3766 (i.e, if a class-specifier, enum-specifier, or non-typename
3767 elaborated-type-specifier appears in the DECLSPECS),
3768 DECLARED_TYPE is set to the corresponding type. */
3769 tree declared_type = NULL_TREE;
3770 bool error_p = false;
3772 if (declspecs->multiple_types_p)
3773 error ("multiple types in one declaration");
3774 else if (declspecs->redefined_builtin_type)
3776 if (!in_system_header)
3777 pedwarn ("redeclaration of C++ built-in type %qT",
3778 declspecs->redefined_builtin_type);
3783 && TYPE_P (declspecs->type)
3784 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3785 && IS_AGGR_TYPE (declspecs->type))
3786 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3787 declared_type = declspecs->type;
3788 else if (declspecs->type == error_mark_node)
3790 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3791 pedwarn ("declaration does not declare anything");
3792 /* Check for an anonymous union. */
3793 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3794 && TYPE_ANONYMOUS_P (declared_type))
3796 /* 7/3 In a simple-declaration, the optional init-declarator-list
3797 can be omitted only when declaring a class (clause 9) or
3798 enumeration (7.2), that is, when the decl-specifier-seq contains
3799 either a class-specifier, an elaborated-type-specifier with
3800 a class-key (9.1), or an enum-specifier. In these cases and
3801 whenever a class-specifier or enum-specifier is present in the
3802 decl-specifier-seq, the identifiers in these specifiers are among
3803 the names being declared by the declaration (as class-name,
3804 enum-names, or enumerators, depending on the syntax). In such
3805 cases, and except for the declaration of an unnamed bit-field (9.6),
3806 the decl-specifier-seq shall introduce one or more names into the
3807 program, or shall redeclare a name introduced by a previous
3808 declaration. [Example:
3809 enum { }; // ill-formed
3810 typedef class { }; // ill-formed
3814 error ("missing type-name in typedef-declaration");
3817 /* Anonymous unions are objects, so they can have specifiers. */;
3818 SET_ANON_AGGR_TYPE_P (declared_type);
3820 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3821 && !in_system_header)
3822 pedwarn ("ISO C++ prohibits anonymous structs");
3827 if (declspecs->specs[(int)ds_inline]
3828 || declspecs->specs[(int)ds_virtual])
3829 error ("%qs can only be specified for functions",
3830 declspecs->specs[(int)ds_inline]
3831 ? "inline" : "virtual");
3833 && (!current_class_type
3834 || current_scope () != current_class_type))
3835 error ("%<friend%> can only be specified inside a class");
3836 else if (declspecs->specs[(int)ds_explicit])
3837 error ("%<explicit%> can only be specified for constructors");
3838 else if (declspecs->storage_class)
3839 error ("a storage class can only be specified for objects "
3841 else if (declspecs->specs[(int)ds_const]
3842 || declspecs->specs[(int)ds_volatile]
3843 || declspecs->specs[(int)ds_restrict]
3844 || declspecs->specs[(int)ds_thread])
3845 error ("qualifiers can only be specified for objects "
3847 else if (saw_typedef)
3848 warning (0, "%<typedef%> was ignored in this declaration");
3851 return declared_type;
3854 /* Called when a declaration is seen that contains no names to declare.
3855 If its type is a reference to a structure, union or enum inherited
3856 from a containing scope, shadow that tag name for the current scope
3857 with a forward reference.
3858 If its type defines a new named structure or union
3859 or defines an enum, it is valid but we need not do anything here.
3860 Otherwise, it is an error.
3862 C++: may have to grok the declspecs to learn about static,
3863 complain for anonymous unions.
3865 Returns the TYPE declared -- or NULL_TREE if none. */
3868 shadow_tag (cp_decl_specifier_seq *declspecs)
3870 tree t = check_tag_decl (declspecs);
3875 if (declspecs->attributes)
3877 warning (0, "attribute ignored in declaration of %q+#T", t);
3878 warning (0, "attribute for %q+#T must follow the %qs keyword",
3879 t, class_key_or_enum_as_string (t));
3883 if (maybe_process_partial_specialization (t) == error_mark_node)
3886 /* This is where the variables in an anonymous union are
3887 declared. An anonymous union declaration looks like:
3889 because there is no declarator after the union, the parser
3890 sends that declaration here. */
3891 if (ANON_AGGR_TYPE_P (t))
3893 fixup_anonymous_aggr (t);
3895 if (TYPE_FIELDS (t))
3897 tree decl = grokdeclarator (/*declarator=*/NULL,
3898 declspecs, NORMAL, 0, NULL);
3899 finish_anon_union (decl);
3906 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3909 groktypename (cp_decl_specifier_seq *type_specifiers,
3910 const cp_declarator *declarator)
3914 attrs = type_specifiers->attributes;
3915 type_specifiers->attributes = NULL_TREE;
3916 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3917 if (attrs && type != error_mark_node)
3919 if (CLASS_TYPE_P (type))
3920 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3921 "outside of definition", type);
3922 else if (IS_AGGR_TYPE (type))
3923 /* A template type parameter or other dependent type. */
3924 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3925 "type %qT without an associated declaration", type);
3927 cplus_decl_attributes (&type, attrs, 0);
3932 /* Process a DECLARATOR for a function-scope variable declaration,
3933 namespace-scope variable declaration, or function declaration.
3934 (Function definitions go through start_function; class member
3935 declarations appearing in the body of the class go through
3936 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3937 If an error occurs, the error_mark_node is returned instead.
3939 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED
3940 is true if an explicit initializer is present, but false if this is
3941 a variable implicitly initialized via a default constructor.
3942 ATTRIBUTES and PREFIX_ATTRIBUTES are GNU attributes associated with
3943 this declaration. *PUSHED_SCOPE_P is set to the scope entered in
3944 this function, if any; if set, the caller is responsible for
3945 calling pop_scope. */
3948 start_decl (const cp_declarator *declarator,
3949 cp_decl_specifier_seq *declspecs,
3952 tree prefix_attributes,
3953 tree *pushed_scope_p)
3961 *pushed_scope_p = NULL_TREE;
3963 /* An object declared as __attribute__((deprecated)) suppresses
3964 warnings of uses of other deprecated items. */
3965 if (lookup_attribute ("deprecated", attributes))
3966 deprecated_state = DEPRECATED_SUPPRESS;
3968 attributes = chainon (attributes, prefix_attributes);
3970 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3973 deprecated_state = DEPRECATED_NORMAL;
3975 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3976 || decl == error_mark_node)
3977 return error_mark_node;
3979 type = TREE_TYPE (decl);
3981 context = DECL_CONTEXT (decl);
3985 *pushed_scope_p = push_scope (context);
3987 /* We are only interested in class contexts, later. */
3988 if (TREE_CODE (context) == NAMESPACE_DECL)
3989 context = NULL_TREE;
3993 /* Is it valid for this decl to have an initializer at all?
3994 If not, set INITIALIZED to zero, which will indirectly
3995 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3996 switch (TREE_CODE (decl))
3999 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4000 return error_mark_node;
4003 error ("function %q#D is initialized like a variable", decl);
4004 return error_mark_node;
4012 if (! toplevel_bindings_p ()
4013 && DECL_EXTERNAL (decl))
4014 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4016 DECL_EXTERNAL (decl) = 0;
4017 if (toplevel_bindings_p ())
4018 TREE_STATIC (decl) = 1;
4021 /* If this is a typedef that names the class for linkage purposes
4022 (7.1.3p8), apply any attributes directly to the type. */
4023 if (TREE_CODE (decl) == TYPE_DECL
4024 && TAGGED_TYPE_P (TREE_TYPE (decl))
4025 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4026 flags = ATTR_FLAG_TYPE_IN_PLACE;
4030 /* Set attributes here so if duplicate decl, will have proper attributes. */
4031 cplus_decl_attributes (&decl, attributes, flags);
4033 /* Dllimported symbols cannot be defined. Static data members (which
4034 can be initialized in-class and dllimported) go through grokfield,
4035 not here, so we don't need to exclude those decls when checking for
4037 if (initialized && DECL_DLLIMPORT_P (decl))
4039 error ("definition of %q#D is marked %<dllimport%>", decl);
4040 DECL_DLLIMPORT_P (decl) = 0;
4043 /* If #pragma weak was used, mark the decl weak now. */
4044 maybe_apply_pragma_weak (decl);
4046 if (TREE_CODE (decl) == FUNCTION_DECL
4047 && DECL_DECLARED_INLINE_P (decl)
4048 && DECL_UNINLINABLE (decl)
4049 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4050 warning (0, "inline function %q+D given attribute noinline", decl);
4052 if (context && COMPLETE_TYPE_P (complete_type (context)))
4054 if (TREE_CODE (decl) == VAR_DECL)
4056 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4057 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4058 error ("%q#D is not a static member of %q#T", decl, context);
4061 if (DECL_CONTEXT (field) != context)
4063 if (!same_type_p (DECL_CONTEXT (field), context))
4064 pedwarn ("ISO C++ does not permit %<%T::%D%> "
4065 "to be defined as %<%T::%D%>",
4066 DECL_CONTEXT (field), DECL_NAME (decl),
4067 context, DECL_NAME (decl));
4068 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4070 if (processing_specialization
4071 && template_class_depth (context) == 0
4072 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4073 error ("template header not allowed in member definition "
4074 "of explicitly specialized class");
4075 /* Static data member are tricky; an in-class initialization
4076 still doesn't provide a definition, so the in-class
4077 declaration will have DECL_EXTERNAL set, but will have an
4078 initialization. Thus, duplicate_decls won't warn
4079 about this situation, and so we check here. */
4080 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4081 error ("duplicate initialization of %qD", decl);
4082 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4088 tree field = check_classfn (context, decl,
4089 (processing_template_decl
4090 > template_class_depth (context))
4091 ? current_template_parms
4093 if (field && field != error_mark_node
4094 && duplicate_decls (decl, field,
4095 /*newdecl_is_friend=*/false))
4099 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4100 DECL_IN_AGGR_P (decl) = 0;
4101 /* Do not mark DECL as an explicit specialization if it was not
4102 already marked as an instantiation; a declaration should
4103 never be marked as a specialization unless we know what
4104 template is being specialized. */
4105 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4107 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4109 /* [temp.expl.spec] An explicit specialization of a static data
4110 member of a template is a definition if the declaration
4111 includes an initializer; otherwise, it is a declaration.
4113 We check for processing_specialization so this only applies
4114 to the new specialization syntax. */
4115 if (!initialized && processing_specialization)
4116 DECL_EXTERNAL (decl) = 1;
4119 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4120 pedwarn ("declaration of %q#D outside of class is not definition",
4124 was_public = TREE_PUBLIC (decl);
4126 /* Enter this declaration into the symbol table. */
4127 decl = maybe_push_decl (decl);
4129 if (processing_template_decl)
4130 decl = push_template_decl (decl);
4131 if (decl == error_mark_node)
4132 return error_mark_node;
4134 /* Tell the back end to use or not use .common as appropriate. If we say
4135 -fconserve-space, we want this to save .data space, at the expense of
4136 wrong semantics. If we say -fno-conserve-space, we want this to
4137 produce errors about redefs; to do this we force variables into the
4139 if (flag_conserve_space
4140 && TREE_CODE (decl) == VAR_DECL
4141 && TREE_PUBLIC (decl)
4142 && !DECL_THREAD_LOCAL_P (decl)
4143 && !have_global_bss_p ())
4144 DECL_COMMON (decl) = 1;
4146 if (TREE_CODE (decl) == VAR_DECL
4147 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4148 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4150 /* This is a const variable with implicit 'static'. Set
4151 DECL_THIS_STATIC so we can tell it from variables that are
4152 !TREE_PUBLIC because of the anonymous namespace. */
4153 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4154 DECL_THIS_STATIC (decl) = 1;
4157 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4158 start_decl_1 (decl, initialized);
4163 /* Process the declaration of a variable DECL. INITIALIZED is true
4164 iff DECL is explicitly initialized. (INITIALIZED is false if the
4165 variable is initialized via an implicitly-called constructor.)
4166 This function must be called for ordinary variables (including, for
4167 example, implicit instantiations of templates), but must not be
4168 called for template declarations. */
4171 start_decl_1 (tree decl, bool initialized)
4175 bool aggregate_definition_p;
4177 gcc_assert (!processing_template_decl);
4179 if (error_operand_p (decl))
4182 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4184 type = TREE_TYPE (decl);
4185 complete_p = COMPLETE_TYPE_P (type);
4186 aggregate_definition_p = IS_AGGR_TYPE (type) && !DECL_EXTERNAL (decl);
4188 /* If an explicit initializer is present, or if this is a definition
4189 of an aggregate, then we need a complete type at this point.
4190 (Scalars are always complete types, so there is nothing to
4191 check.) This code just sets COMPLETE_P; errors (if necessary)
4192 are issued below. */
4193 if ((initialized || aggregate_definition_p)
4195 && COMPLETE_TYPE_P (complete_type (type)))
4198 /* We will not yet have set TREE_READONLY on DECL if the type
4199 was "const", but incomplete, before this point. But, now, we
4200 have a complete type, so we can try again. */
4201 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4205 /* Is it valid for this decl to have an initializer at all? */
4207 /* Don't allow initializations for incomplete types except for
4208 arrays which might be completed by the initialization. */
4210 ; /* A complete type is ok. */
4211 else if (TREE_CODE (type) != ARRAY_TYPE)
4213 error ("variable %q#D has initializer but incomplete type", decl);
4214 type = TREE_TYPE (decl) = error_mark_node;
4216 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4218 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4219 error ("elements of array %q#D have incomplete type", decl);
4220 /* else we already gave an error in start_decl. */
4223 else if (aggregate_definition_p && !complete_p)
4225 error ("aggregate %q#D has incomplete type and cannot be defined",
4227 /* Change the type so that assemble_variable will give
4228 DECL an rtl we can live with: (mem (const_int 0)). */
4229 type = TREE_TYPE (decl) = error_mark_node;
4232 /* Create a new scope to hold this declaration if necessary.
4233 Whether or not a new scope is necessary cannot be determined
4234 until after the type has been completed; if the type is a
4235 specialization of a class template it is not until after
4236 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4237 will be set correctly. */
4238 maybe_push_cleanup_level (type);
4241 /* Handle initialization of references. DECL, TYPE, and INIT have the
4242 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4243 but will be set to a new CLEANUP_STMT if a temporary is created
4244 that must be destroyed subsequently.
4246 Returns an initializer expression to use to initialize DECL, or
4247 NULL if the initialization can be performed statically.
4249 Quotes on semantics can be found in ARM 8.4.3. */
4252 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4256 if (init == NULL_TREE)
4258 if ((DECL_LANG_SPECIFIC (decl) == 0
4259 || DECL_IN_AGGR_P (decl) == 0)
4260 && ! DECL_THIS_EXTERN (decl))
4261 error ("%qD declared as reference but not initialized", decl);
4265 if (TREE_CODE (init) == CONSTRUCTOR)
4267 error ("ISO C++ forbids use of initializer list to "
4268 "initialize reference %qD", decl);
4272 if (TREE_CODE (init) == TREE_LIST)
4273 init = build_x_compound_expr_from_list (init, "initializer");
4275 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4276 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4277 /* Note: default conversion is only called in very special cases. */
4278 init = decay_conversion (init);
4280 /* Convert INIT to the reference type TYPE. This may involve the
4281 creation of a temporary, whose lifetime must be the same as that
4282 of the reference. If so, a DECL_EXPR for the temporary will be
4283 added just after the DECL_EXPR for DECL. That's why we don't set
4284 DECL_INITIAL for local references (instead assigning to them
4285 explicitly); we need to allow the temporary to be initialized
4287 tmp = initialize_reference (type, init, decl, cleanup);
4289 if (tmp == error_mark_node)
4291 else if (tmp == NULL_TREE)
4293 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4297 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4300 DECL_INITIAL (decl) = tmp;
4305 /* Designated initializers in arrays are not supported in GNU C++.
4306 The parser cannot detect this error since it does not know whether
4307 a given brace-enclosed initializer is for a class type or for an
4308 array. This function checks that CE does not use a designated
4309 initializer. If it does, an error is issued. Returns true if CE
4310 is valid, i.e., does not have a designated initializer. */
4313 check_array_designated_initializer (const constructor_elt *ce)
4315 /* Designated initializers for array elements are not supported. */
4318 /* The parser only allows identifiers as designated
4320 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4321 error ("name %qD used in a GNU-style designated "
4322 "initializer for an array", ce->index);
4329 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4330 array until we finish parsing the initializer. If that's the
4331 situation we're in, update DECL accordingly. */
4334 maybe_deduce_size_from_array_init (tree decl, tree init)
4336 tree type = TREE_TYPE (decl);
4338 if (TREE_CODE (type) == ARRAY_TYPE
4339 && TYPE_DOMAIN (type) == NULL_TREE
4340 && TREE_CODE (decl) != TYPE_DECL)
4342 /* do_default is really a C-ism to deal with tentative definitions.
4343 But let's leave it here to ease the eventual merge. */
4344 int do_default = !DECL_EXTERNAL (decl);
4345 tree initializer = init ? init : DECL_INITIAL (decl);
4348 /* Check that there are no designated initializers in INIT, as
4349 those are not supported in GNU C++, and as the middle-end
4350 will crash if presented with a non-numeric designated
4352 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4354 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4355 constructor_elt *ce;
4358 VEC_iterate (constructor_elt, v, i, ce);
4360 if (!check_array_designated_initializer (ce))
4366 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4370 error ("initializer fails to determine size of %qD", decl);
4371 TREE_TYPE (decl) = error_mark_node;
4373 else if (failure == 2)
4377 error ("array size missing in %qD", decl);
4378 TREE_TYPE (decl) = error_mark_node;
4380 /* If a `static' var's size isn't known, make it extern as
4381 well as static, so it does not get allocated. If it's not
4382 `static', then don't mark it extern; finish_incomplete_decl
4383 will give it a default size and it will get allocated. */
4384 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4385 DECL_EXTERNAL (decl) = 1;
4387 else if (failure == 3)
4389 error ("zero-size array %qD", decl);
4390 TREE_TYPE (decl) = error_mark_node;
4394 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4396 layout_decl (decl, 0);
4400 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4401 any appropriate error messages regarding the layout. */
4404 layout_var_decl (tree decl)
4408 type = TREE_TYPE (decl);
4409 if (type == error_mark_node)
4412 /* If we haven't already layed out this declaration, do so now.
4413 Note that we must not call complete type for an external object
4414 because it's type might involve templates that we are not
4415 supposed to instantiate yet. (And it's perfectly valid to say
4416 `extern X x' for some incomplete type `X'.) */
4417 if (!DECL_EXTERNAL (decl))
4418 complete_type (type);
4419 if (!DECL_SIZE (decl)
4420 && TREE_TYPE (decl) != error_mark_node
4421 && (COMPLETE_TYPE_P (type)
4422 || (TREE_CODE (type) == ARRAY_TYPE
4423 && !TYPE_DOMAIN (type)
4424 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4425 layout_decl (decl, 0);
4427 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4429 /* An automatic variable with an incomplete type: that is an error.
4430 Don't talk about array types here, since we took care of that
4431 message in grokdeclarator. */
4432 error ("storage size of %qD isn't known", decl);
4433 TREE_TYPE (decl) = error_mark_node;
4436 /* Keep this code around in case we later want to control debug info
4437 based on whether a type is "used". (jason 1999-11-11) */
4439 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4440 /* Let debugger know it should output info for this type. */
4441 note_debug_info_needed (ttype);
4443 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4444 note_debug_info_needed (DECL_CONTEXT (decl));
4447 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4448 && DECL_SIZE (decl) != NULL_TREE
4449 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4451 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4452 constant_expression_warning (DECL_SIZE (decl));
4454 error ("storage size of %qD isn't constant", decl);
4458 /* If a local static variable is declared in an inline function, or if
4459 we have a weak definition, we must endeavor to create only one
4460 instance of the variable at link-time. */
4463 maybe_commonize_var (tree decl)
4465 /* Static data in a function with comdat linkage also has comdat
4467 if (TREE_STATIC (decl)
4468 /* Don't mess with __FUNCTION__. */
4469 && ! DECL_ARTIFICIAL (decl)
4470 && DECL_FUNCTION_SCOPE_P (decl)
4471 /* Unfortunately, import_export_decl has not always been called
4472 before the function is processed, so we cannot simply check
4474 && (DECL_COMDAT (DECL_CONTEXT (decl))
4475 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4476 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4477 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4481 /* With weak symbols, we simply make the variable COMDAT;
4482 that will cause copies in multiple translations units to
4484 comdat_linkage (decl);
4488 if (DECL_INITIAL (decl) == NULL_TREE
4489 || DECL_INITIAL (decl) == error_mark_node)
4491 /* Without weak symbols, we can use COMMON to merge
4492 uninitialized variables. */
4493 TREE_PUBLIC (decl) = 1;
4494 DECL_COMMON (decl) = 1;
4498 /* While for initialized variables, we must use internal
4499 linkage -- which means that multiple copies will not
4501 TREE_PUBLIC (decl) = 0;
4502 DECL_COMMON (decl) = 0;
4503 warning (0, "sorry: semantics of inline function static "
4504 "data %q+#D are wrong (you'll wind up "
4505 "with multiple copies)", decl);
4506 warning (0, "%J you can work around this by removing "
4512 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4513 /* Set it up again; we might have set DECL_INITIAL since the last
4515 comdat_linkage (decl);
4518 /* Issue an error message if DECL is an uninitialized const variable. */
4521 check_for_uninitialized_const_var (tree decl)
4523 tree type = TREE_TYPE (decl);
4525 /* ``Unless explicitly declared extern, a const object does not have
4526 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4528 if (TREE_CODE (decl) == VAR_DECL
4529 && TREE_CODE (type) != REFERENCE_TYPE
4530 && CP_TYPE_CONST_P (type)
4531 && !TYPE_NEEDS_CONSTRUCTING (type)
4532 && !DECL_INITIAL (decl))
4533 error ("uninitialized const %qD", decl);
4537 /* Structure holding the current initializer being processed by reshape_init.
4538 CUR is a pointer to the current element being processed, END is a pointer
4539 after the last element present in the initializer. */
4540 typedef struct reshape_iterator_t
4542 constructor_elt *cur;
4543 constructor_elt *end;
4546 static tree reshape_init_r (tree, reshape_iter *, bool);
4548 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4549 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4550 initialized. If there are no more such fields, the return value
4554 next_initializable_field (tree field)
4557 && (TREE_CODE (field) != FIELD_DECL
4558 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4559 || DECL_ARTIFICIAL (field)))
4560 field = TREE_CHAIN (field);
4565 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4566 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4567 INTEGER_CST representing the size of the array minus one (the maximum index),
4568 or NULL_TREE if the array was declared without specifying the size. D is
4569 the iterator within the constructor. */
4572 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4575 bool sized_array_p = (max_index != NULL_TREE);
4576 unsigned HOST_WIDE_INT max_index_cst = 0;
4577 unsigned HOST_WIDE_INT index;
4579 /* The initializer for an array is always a CONSTRUCTOR. */
4580 new_init = build_constructor (NULL_TREE, NULL);
4584 /* Minus 1 is used for zero sized arrays. */
4585 if (integer_all_onesp (max_index))
4588 if (host_integerp (max_index, 1))
4589 max_index_cst = tree_low_cst (max_index, 1);
4590 /* sizetype is sign extended, not zero extended. */
4592 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4596 /* Loop until there are no more initializers. */
4598 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4603 check_array_designated_initializer (d->cur);
4604 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4605 if (elt_init == error_mark_node)
4606 return error_mark_node;
4607 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4613 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4614 Parameters are the same of reshape_init_r. */
4617 reshape_init_array (tree type, reshape_iter *d)
4619 tree max_index = NULL_TREE;
4621 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4623 if (TYPE_DOMAIN (type))
4624 max_index = array_type_nelts (type);
4626 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4629 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4630 Parameters are the same of reshape_init_r. */
4633 reshape_init_vector (tree type, reshape_iter *d)
4635 tree max_index = NULL_TREE;
4638 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4640 if (COMPOUND_LITERAL_P (d->cur->value))
4642 tree value = d->cur->value;
4643 if (!same_type_p (TREE_TYPE (value), type))
4645 error ("invalid type %qT as initializer for a vector of type %qT",
4646 TREE_TYPE (d->cur->value), type);
4647 value = error_mark_node;
4653 /* For a vector, the representation type is a struct
4654 containing a single member which is an array of the
4655 appropriate size. */
4656 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4657 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4658 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4660 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4663 /* Subroutine of reshape_init_r, processes the initializers for classes
4664 or union. Parameters are the same of reshape_init_r. */
4667 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4672 gcc_assert (CLASS_TYPE_P (type));
4674 /* The initializer for a class is always a CONSTRUCTOR. */
4675 new_init = build_constructor (NULL_TREE, NULL);
4676 field = next_initializable_field (TYPE_FIELDS (type));
4682 An initializer for an aggregate member that is an
4683 empty class shall have the form of an empty
4684 initializer-list {}. */
4685 if (!first_initializer_p)
4687 error ("initializer for %qT must be brace-enclosed", type);
4688 return error_mark_node;
4693 /* Loop through the initializable fields, gathering initializers. */
4694 while (d->cur != d->end)
4698 /* Handle designated initializers, as an extension. */
4701 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4703 if (!field || TREE_CODE (field) != FIELD_DECL)
4705 error ("%qT has no non-static data member named %qD", type,
4707 return error_mark_node;
4711 /* If we processed all the member of the class, we are done. */
4715 field_init = reshape_init_r (TREE_TYPE (field), d,
4716 /*first_initializer_p=*/false);
4717 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4721 When a union is initialized with a brace-enclosed
4722 initializer, the braces shall only contain an
4723 initializer for the first member of the union. */
4724 if (TREE_CODE (type) == UNION_TYPE)
4727 field = next_initializable_field (TREE_CHAIN (field));
4733 /* Subroutine of reshape_init, which processes a single initializer (part of
4734 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4735 iterator within the CONSTRUCTOR which points to the initializer to process.
4736 FIRST_INITIALIZER_P is true if this is the first initializer of the
4737 CONSTRUCTOR node. */
4740 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4742 tree init = d->cur->value;
4744 /* A non-aggregate type is always initialized with a single
4746 if (!CP_AGGREGATE_TYPE_P (type))
4748 /* It is invalid to initialize a non-aggregate type with a
4749 brace-enclosed initializer.
4750 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4751 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4752 a CONSTRUCTOR (with a record type). */
4753 if (TREE_CODE (init) == CONSTRUCTOR
4754 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4756 error ("braces around scalar initializer for type %qT", type);
4757 init = error_mark_node;
4766 All implicit type conversions (clause _conv_) are considered when
4767 initializing the aggregate member with an initializer from an
4768 initializer-list. If the initializer can initialize a member,
4769 the member is initialized. Otherwise, if the member is itself a
4770 non-empty subaggregate, brace elision is assumed and the
4771 initializer is considered for the initialization of the first
4772 member of the subaggregate. */
4773 if (TREE_CODE (init) != CONSTRUCTOR
4774 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4780 /* [dcl.init.string]
4782 A char array (whether plain char, signed char, or unsigned char)
4783 can be initialized by a string-literal (optionally enclosed in
4784 braces); a wchar_t array can be initialized by a wide
4785 string-literal (optionally enclosed in braces). */
4786 if (TREE_CODE (type) == ARRAY_TYPE
4787 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4789 tree str_init = init;
4791 /* Strip one level of braces if and only if they enclose a single
4792 element (as allowed by [dcl.init.string]). */
4793 if (!first_initializer_p
4794 && TREE_CODE (str_init) == CONSTRUCTOR
4795 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4797 str_init = VEC_index (constructor_elt,
4798 CONSTRUCTOR_ELTS (str_init), 0)->value;
4801 /* If it's a string literal, then it's the initializer for the array
4802 as a whole. Otherwise, continue with normal initialization for
4803 array types (one value per array element). */
4804 if (TREE_CODE (str_init) == STRING_CST)
4811 /* The following cases are about aggregates. If we are not within a full
4812 initializer already, and there is not a CONSTRUCTOR, it means that there
4813 is a missing set of braces (that is, we are processing the case for
4814 which reshape_init exists). */
4815 if (!first_initializer_p)
4817 if (TREE_CODE (init) == CONSTRUCTOR)
4819 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4820 /* There is no need to reshape pointer-to-member function
4821 initializers, as they are always constructed correctly
4822 by the front end. */
4824 else if (COMPOUND_LITERAL_P (init))
4825 /* For a nested compound literal, there is no need to reshape since
4826 brace elision is not allowed. Even if we decided to allow it,
4827 we should add a call to reshape_init in finish_compound_literal,
4828 before calling digest_init, so changing this code would still
4829 not be necessary. */
4830 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4834 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4835 return reshape_init (type, init);
4839 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4843 /* Dispatch to specialized routines. */
4844 if (CLASS_TYPE_P (type))
4845 return reshape_init_class (type, d, first_initializer_p);
4846 else if (TREE_CODE (type) == ARRAY_TYPE)
4847 return reshape_init_array (type, d);
4848 else if (TREE_CODE (type) == VECTOR_TYPE)
4849 return reshape_init_vector (type, d);
4854 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4855 brace-enclosed aggregate initializer.
4857 INIT is the CONSTRUCTOR containing the list of initializers describing
4858 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4859 It may not presently match the shape of the TYPE; for example:
4861 struct S { int a; int b; };
4862 struct S a[] = { 1, 2, 3, 4 };
4864 Here INIT will hold a VEC of four elements, rather than a
4865 VEC of two elements, each itself a VEC of two elements. This
4866 routine transforms INIT from the former form into the latter. The
4867 revised CONSTRUCTOR node is returned. */
4870 reshape_init (tree type, tree init)
4872 VEC(constructor_elt, gc) *v;
4876 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4878 v = CONSTRUCTOR_ELTS (init);
4880 /* An empty constructor does not need reshaping, and it is always a valid
4882 if (VEC_empty (constructor_elt, v))
4885 /* Recurse on this CONSTRUCTOR. */
4886 d.cur = VEC_index (constructor_elt, v, 0);
4887 d.end = d.cur + VEC_length (constructor_elt, v);
4889 new_init = reshape_init_r (type, &d, true);
4890 if (new_init == error_mark_node)
4891 return error_mark_node;
4893 /* Make sure all the element of the constructor were used. Otherwise,
4894 issue an error about exceeding initializers. */
4896 error ("too many initializers for %qT", type);
4901 /* Verify INIT (the initializer for DECL), and record the
4902 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4903 grok_reference_init.
4905 If the return value is non-NULL, it is an expression that must be
4906 evaluated dynamically to initialize DECL. */
4909 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4911 tree type = TREE_TYPE (decl);
4912 tree init_code = NULL;
4914 /* Things that are going to be initialized need to have complete
4916 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4918 if (type == error_mark_node)
4919 /* We will have already complained. */
4922 if (TREE_CODE (type) == ARRAY_TYPE)
4924 tree element_type = TREE_TYPE (type);
4926 /* The array type itself need not be complete, because the
4927 initializer may tell us how many elements are in the array.
4928 But, the elements of the array must be complete. */
4929 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4931 error ("elements of array %q#D have incomplete type", decl);
4934 /* It is not valid to initialize a VLA. */
4936 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4937 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4939 error ("variable-sized object %qD may not be initialized", decl);
4943 else if (!COMPLETE_TYPE_P (type))
4945 error ("%qD has incomplete type", decl);
4946 TREE_TYPE (decl) = error_mark_node;
4950 /* There is no way to make a variable-sized class type in GNU C++. */
4951 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4953 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4955 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4956 if (SCALAR_TYPE_P (type))
4960 error ("scalar object %qD requires one element in initializer",
4962 TREE_TYPE (decl) = error_mark_node;
4966 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4968 /* A non-aggregate that is not a scalar cannot be initialized
4969 via an initializer-list in C++98. */
4970 error ("braces around initializer for non-aggregate type %qT",
4972 TREE_TYPE (decl) = error_mark_node;
4977 if (TREE_CODE (decl) == CONST_DECL)
4979 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4981 DECL_INITIAL (decl) = init;
4983 gcc_assert (init != NULL_TREE);
4986 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4987 init = grok_reference_init (decl, type, init, cleanup);
4990 /* Do not reshape constructors of vectors (they don't need to be
4992 if (TREE_CODE (init) == CONSTRUCTOR
4993 && !COMPOUND_LITERAL_P (init)
4994 && !TREE_TYPE (init)) /* ptrmemfunc */
4996 init = reshape_init (type, init);
4998 if ((*targetm.vector_opaque_p) (type))
5000 error ("opaque vector types cannot be initialized");
5001 init = error_mark_node;
5005 /* If DECL has an array type without a specific bound, deduce the
5006 array size from the initializer. */
5007 maybe_deduce_size_from_array_init (decl, init);
5008 type = TREE_TYPE (decl);
5009 if (type == error_mark_node)
5012 if (TREE_CODE (type) == ARRAY_TYPE && TYPE_NEEDS_CONSTRUCTING (type))
5013 goto initialize_aggr;
5014 else if (CLASS_TYPE_P (type))
5016 if (TREE_CODE (init) == CONSTRUCTOR)
5018 if (TYPE_NON_AGGREGATE_CLASS (type))
5020 error ("%qD must be initialized by constructor, "
5023 init = error_mark_node;
5026 goto dont_use_constructor;
5030 int saved_stmts_are_full_exprs_p;
5033 saved_stmts_are_full_exprs_p = 0;
5034 if (building_stmt_tree ())
5036 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5037 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5039 init = build_aggr_init (decl, init, flags);
5040 if (building_stmt_tree ())
5041 current_stmt_tree ()->stmts_are_full_exprs_p =
5042 saved_stmts_are_full_exprs_p;
5048 dont_use_constructor:
5049 if (TREE_CODE (init) != TREE_VEC)
5051 init_code = store_init_value (decl, init);
5052 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5053 && DECL_INITIAL (decl)
5054 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5055 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5056 warning (0, "array %qD initialized by parenthesized string literal %qE",
5057 decl, DECL_INITIAL (decl));
5062 else if (DECL_EXTERNAL (decl))
5064 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5065 goto initialize_aggr;
5066 else if (IS_AGGR_TYPE (type))
5068 tree core_type = strip_array_types (type);
5070 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5071 error ("structure %qD with uninitialized const members", decl);
5072 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5073 error ("structure %qD with uninitialized reference members", decl);
5075 check_for_uninitialized_const_var (decl);
5078 check_for_uninitialized_const_var (decl);
5080 if (init && init != error_mark_node)
5081 init_code = build2 (INIT_EXPR, type, decl, init);
5086 /* If DECL is not a local variable, give it RTL. */
5089 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5091 int toplev = toplevel_bindings_p ();
5093 const char *filename;
5095 /* Set the DECL_ASSEMBLER_NAME for the object. */
5098 /* The `register' keyword, when used together with an
5099 asm-specification, indicates that the variable should be
5100 placed in a particular register. */
5101 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5103 set_user_assembler_name (decl, asmspec);
5104 DECL_HARD_REGISTER (decl) = 1;
5108 if (TREE_CODE (decl) == FUNCTION_DECL
5109 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5110 set_builtin_user_assembler_name (decl, asmspec);
5111 set_user_assembler_name (decl, asmspec);
5115 /* Handle non-variables up front. */
5116 if (TREE_CODE (decl) != VAR_DECL)
5118 rest_of_decl_compilation (decl, toplev, at_eof);
5122 /* If we see a class member here, it should be a static data
5124 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5126 gcc_assert (TREE_STATIC (decl));
5127 /* An in-class declaration of a static data member should be
5128 external; it is only a declaration, and not a definition. */
5129 if (init == NULL_TREE)
5130 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5133 /* We don't create any RTL for local variables. */
5134 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5137 /* We defer emission of local statics until the corresponding
5138 DECL_EXPR is expanded. */
5139 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5141 /* We try to defer namespace-scope static constants so that they are
5142 not emitted into the object file unnecessarily. */
5143 filename = input_filename;
5144 if (!DECL_VIRTUAL_P (decl)
5145 && TREE_READONLY (decl)
5146 && DECL_INITIAL (decl) != NULL_TREE
5147 && DECL_INITIAL (decl) != error_mark_node
5149 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5151 && !TREE_PUBLIC (decl))
5153 /* Fool with the linkage of static consts according to #pragma
5155 struct c_fileinfo *finfo = get_fileinfo (filename);
5156 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5158 TREE_PUBLIC (decl) = 1;
5159 DECL_EXTERNAL (decl) = finfo->interface_only;
5164 /* Likewise for template instantiations. */
5165 else if (DECL_LANG_SPECIFIC (decl)
5166 && DECL_IMPLICIT_INSTANTIATION (decl))
5169 /* If we're not deferring, go ahead and assemble the variable. */
5171 rest_of_decl_compilation (decl, toplev, at_eof);
5174 /* walk_tree helper for wrap_temporary_cleanups, below. */
5177 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5179 if (TYPE_P (*stmt_p))
5185 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5187 tree guard = (tree)data;
5188 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5190 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5191 /* Tell honor_protect_cleanup_actions to handle this as a separate
5193 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5195 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5201 /* We're initializing a local variable which has a cleanup GUARD. If there
5202 are any temporaries used in the initializer INIT of this variable, we
5203 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5204 variable will be cleaned up properly if one of them throws.
5206 Unfortunately, there's no way to express this properly in terms of
5207 nesting, as the regions for the temporaries overlap the region for the
5208 variable itself; if there are two temporaries, the variable needs to be
5209 the first thing destroyed if either of them throws. However, we only
5210 want to run the variable's cleanup if it actually got constructed. So
5211 we need to guard the temporary cleanups with the variable's cleanup if
5212 they are run on the normal path, but not if they are run on the
5213 exceptional path. We implement this by telling
5214 honor_protect_cleanup_actions to strip the variable cleanup from the
5215 exceptional path. */
5218 wrap_temporary_cleanups (tree init, tree guard)
5220 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5223 /* Generate code to initialize DECL (a local variable). */
5226 initialize_local_var (tree decl, tree init)
5228 tree type = TREE_TYPE (decl);
5232 gcc_assert (TREE_CODE (decl) == VAR_DECL
5233 || TREE_CODE (decl) == RESULT_DECL);
5234 gcc_assert (!TREE_STATIC (decl));
5236 if (DECL_SIZE (decl) == NULL_TREE)
5238 /* If we used it already as memory, it must stay in memory. */
5239 DECL_INITIAL (decl) = NULL_TREE;
5240 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5244 if (type == error_mark_node)
5247 /* Compute and store the initial value. */
5248 already_used = TREE_USED (decl) || TREE_USED (type);
5250 /* Generate a cleanup, if necessary. */
5251 cleanup = cxx_maybe_build_cleanup (decl);
5253 /* Perform the initialization. */
5256 int saved_stmts_are_full_exprs_p;
5258 /* If we're only initializing a single object, guard the destructors
5259 of any temporaries used in its initializer with its destructor.
5260 This isn't right for arrays because each element initialization is
5261 a full-expression. */
5262 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5263 wrap_temporary_cleanups (init, cleanup);
5265 gcc_assert (building_stmt_tree ());
5266 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5267 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5268 finish_expr_stmt (init);
5269 current_stmt_tree ()->stmts_are_full_exprs_p =
5270 saved_stmts_are_full_exprs_p;
5273 /* Set this to 0 so we can tell whether an aggregate which was
5274 initialized was ever used. Don't do this if it has a
5275 destructor, so we don't complain about the 'resource
5276 allocation is initialization' idiom. Now set
5277 attribute((unused)) on types so decls of that type will be
5278 marked used. (see TREE_USED, above.) */
5279 if (TYPE_NEEDS_CONSTRUCTING (type)
5281 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5282 && DECL_NAME (decl))
5283 TREE_USED (decl) = 0;
5284 else if (already_used)
5285 TREE_USED (decl) = 1;
5288 finish_decl_cleanup (decl, cleanup);
5291 /* DECL is a VAR_DECL for a compiler-generated variable with static
5292 storage duration (like a virtual table) whose initializer is a
5293 compile-time constant. INIT must be either a TREE_LIST of values,
5294 or a CONSTRUCTOR. Initialize the variable and provide it to the
5298 initialize_artificial_var (tree decl, tree init)
5300 gcc_assert (DECL_ARTIFICIAL (decl));
5301 if (TREE_CODE (init) == TREE_LIST)
5302 init = build_constructor_from_list (NULL_TREE, init);
5303 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5304 DECL_INITIAL (decl) = init;
5305 DECL_INITIALIZED_P (decl) = 1;
5306 determine_visibility (decl);
5307 layout_var_decl (decl);
5308 maybe_commonize_var (decl);
5309 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5312 /* INIT is the initializer for a variable, as represented by the
5313 parser. Returns true iff INIT is value-dependent. */
5316 value_dependent_init_p (tree init)
5318 if (TREE_CODE (init) == TREE_LIST)
5319 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5320 return any_value_dependent_elements_p (init);
5321 else if (TREE_CODE (init) == CONSTRUCTOR)
5322 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5324 VEC(constructor_elt, gc) *elts;
5328 elts = CONSTRUCTOR_ELTS (init);
5329 nelts = VEC_length (constructor_elt, elts);
5330 for (i = 0; i < nelts; ++i)
5331 if (value_dependent_init_p (VEC_index (constructor_elt,
5336 /* It must be a simple expression, e.g., int i = 3; */
5337 return value_dependent_expression_p (init);
5342 /* Finish processing of a declaration;
5343 install its line number and initial value.
5344 If the length of an array type is not known before,
5345 it must be determined now, from the initial value, or it is an error.
5347 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5348 true, then INIT is an integral constant expression.
5350 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5351 if the (init) syntax was used. */
5354 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5355 tree asmspec_tree, int flags)
5359 const char *asmspec = NULL;
5360 int was_readonly = 0;
5361 bool var_definition_p = false;
5362 int saved_processing_template_decl;
5364 if (decl == error_mark_node)
5369 error ("assignment (not initialization) in declaration");
5373 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5374 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5375 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5377 type = TREE_TYPE (decl);
5378 if (type == error_mark_node)
5381 /* Assume no cleanup is required. */
5382 cleanup = NULL_TREE;
5383 saved_processing_template_decl = processing_template_decl;
5385 /* If a name was specified, get the string. */
5386 if (global_scope_p (current_binding_level))
5387 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5388 if (asmspec_tree && asmspec_tree != error_mark_node)
5389 asmspec = TREE_STRING_POINTER (asmspec_tree);
5391 if (current_class_type
5392 && CP_DECL_CONTEXT (decl) == current_class_type
5393 && TYPE_BEING_DEFINED (current_class_type)
5394 && (DECL_INITIAL (decl) || init))
5395 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5397 if (processing_template_decl)
5399 bool type_dependent_p;
5401 /* Add this declaration to the statement-tree. */
5402 if (at_function_scope_p ())
5403 add_decl_expr (decl);
5405 type_dependent_p = dependent_type_p (type);
5407 if (check_for_bare_parameter_packs (init))
5410 DECL_INITIAL (decl) = NULL_TREE;
5413 if (init && init_const_expr_p)
5415 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5416 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5417 TREE_CONSTANT (decl) = 1;
5420 /* Generally, initializers in templates are expanded when the
5421 template is instantiated. But, if DECL is an integral
5422 constant static data member, then it can be used in future
5423 integral constant expressions, and its value must be
5426 && DECL_CLASS_SCOPE_P (decl)
5427 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5428 && !type_dependent_p
5429 && !value_dependent_init_p (init)))
5432 DECL_INITIAL (decl) = init;
5433 if (TREE_CODE (decl) == VAR_DECL
5434 && !DECL_PRETTY_FUNCTION_P (decl)
5435 && !type_dependent_p)
5436 maybe_deduce_size_from_array_init (decl, init);
5440 if (TREE_CODE (init) == TREE_LIST)
5442 /* If the parenthesized-initializer form was used (e.g.,
5443 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5444 arguments. (There is generally only one.) We convert them
5447 for (; list; list = TREE_CHAIN (list))
5449 tree elt = TREE_VALUE (list);
5450 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5454 init = fold_non_dependent_expr (init);
5455 processing_template_decl = 0;
5458 /* Take care of TYPE_DECLs up front. */
5459 if (TREE_CODE (decl) == TYPE_DECL)
5461 if (type != error_mark_node
5462 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5464 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5465 warning (0, "shadowing previous type declaration of %q#D", decl);
5466 set_identifier_type_value (DECL_NAME (decl), decl);
5469 /* If we have installed this as the canonical typedef for this
5470 type, and that type has not been defined yet, delay emitting
5471 the debug information for it, as we will emit it later. */
5472 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5473 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5474 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5476 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5481 /* A reference will be modified here, as it is initialized. */
5482 if (! DECL_EXTERNAL (decl)
5483 && TREE_READONLY (decl)
5484 && TREE_CODE (type) == REFERENCE_TYPE)
5487 TREE_READONLY (decl) = 0;
5490 if (TREE_CODE (decl) == VAR_DECL)
5492 /* Only PODs can have thread-local storage. Other types may require
5493 various kinds of non-trivial initialization. */
5494 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5495 error ("%qD cannot be thread-local because it has non-POD type %qT",
5496 decl, TREE_TYPE (decl));
5497 /* If this is a local variable that will need a mangled name,
5498 register it now. We must do this before processing the
5499 initializer for the variable, since the initialization might
5500 require a guard variable, and since the mangled name of the
5501 guard variable will depend on the mangled name of this
5503 if (DECL_FUNCTION_SCOPE_P (decl)
5504 && TREE_STATIC (decl)
5505 && !DECL_ARTIFICIAL (decl))
5506 push_local_name (decl);
5507 /* Convert the initializer to the type of DECL, if we have not
5508 already initialized DECL. */
5509 if (!DECL_INITIALIZED_P (decl)
5510 /* If !DECL_EXTERNAL then DECL is being defined. In the
5511 case of a static data member initialized inside the
5512 class-specifier, there can be an initializer even if DECL
5513 is *not* defined. */
5514 && (!DECL_EXTERNAL (decl) || init))
5516 if (TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5519 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5520 /* Allow libjava/prims.cc define primitive classes. */
5521 if (init != NULL_TREE
5522 || jclass == NULL_TREE
5523 || TREE_CODE (jclass) != TYPE_DECL
5524 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5525 || !same_type_ignoring_top_level_qualifiers_p
5526 (type, TREE_TYPE (TREE_TYPE (jclass))))
5527 error ("Java object %qD not allocated with %<new%>", decl);
5532 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5533 if (init_const_expr_p)
5535 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5536 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5537 TREE_CONSTANT (decl) = 1;
5540 init = check_initializer (decl, init, flags, &cleanup);
5541 /* Thread-local storage cannot be dynamically initialized. */
5542 if (DECL_THREAD_LOCAL_P (decl) && init)
5544 error ("%qD is thread-local and so cannot be dynamically "
5545 "initialized", decl);
5549 /* Check that the initializer for a static data member was a
5550 constant. Although we check in the parser that the
5551 initializer is an integral constant expression, we do not
5552 simplify division-by-zero at the point at which it
5553 occurs. Therefore, in:
5555 struct S { static const int i = 7 / 0; };
5557 we issue an error at this point. It would
5558 probably be better to forbid division by zero in
5559 integral constant expressions. */
5560 if (DECL_EXTERNAL (decl) && init)
5562 error ("%qD cannot be initialized by a non-constant expression"
5563 " when being declared", decl);
5564 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5572 The memory occupied by any object of static storage
5573 duration is zero-initialized at program startup before
5574 any other initialization takes place.
5576 We cannot create an appropriate initializer until after
5577 the type of DECL is finalized. If DECL_INITIAL is set,
5578 then the DECL is statically initialized, and any
5579 necessary zero-initialization has already been performed. */
5580 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5581 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5582 /*nelts=*/NULL_TREE,
5583 /*static_storage_p=*/true);
5584 /* Remember that the initialization for this variable has
5586 DECL_INITIALIZED_P (decl) = 1;
5587 /* This declaration is the definition of this variable,
5588 unless we are initializing a static data member within
5589 the class specifier. */
5590 if (!DECL_EXTERNAL (decl))
5591 var_definition_p = true;
5593 /* If the variable has an array type, lay out the type, even if
5594 there is no initializer. It is valid to index through the
5595 array, and we must get TYPE_ALIGN set correctly on the array
5597 else if (TREE_CODE (type) == ARRAY_TYPE)
5600 else if (TREE_CODE (decl) == FIELD_DECL
5601 && TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5602 error ("non-static data member %qD has Java class type", decl);
5604 /* Add this declaration to the statement-tree. This needs to happen
5605 after the call to check_initializer so that the DECL_EXPR for a
5606 reference temp is added before the DECL_EXPR for the reference itself. */
5607 if (at_function_scope_p ())
5608 add_decl_expr (decl);
5610 /* Let the middle end know about variables and functions -- but not
5611 static data members in uninstantiated class templates. */
5612 if (!saved_processing_template_decl
5613 && (TREE_CODE (decl) == VAR_DECL
5614 || TREE_CODE (decl) == FUNCTION_DECL))
5616 if (TREE_CODE (decl) == VAR_DECL)
5618 layout_var_decl (decl);
5619 maybe_commonize_var (decl);
5622 /* This needs to happen after the linkage is set. */
5623 determine_visibility (decl);
5625 if (var_definition_p && TREE_STATIC (decl))
5627 /* If a TREE_READONLY variable needs initialization
5628 at runtime, it is no longer readonly and we need to
5629 avoid MEM_READONLY_P being set on RTL created for it. */
5632 if (TREE_READONLY (decl))
5633 TREE_READONLY (decl) = 0;
5636 else if (was_readonly)
5637 TREE_READONLY (decl) = 1;
5640 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5642 /* Check for abstractness of the type. Notice that there is no
5643 need to strip array types here since the check for those types
5644 is already done within create_array_type_for_decl. */
5645 if (TREE_CODE (type) == FUNCTION_TYPE
5646 || TREE_CODE (type) == METHOD_TYPE)
5647 abstract_virtuals_error (decl, TREE_TYPE (type));
5649 abstract_virtuals_error (decl, type);
5651 if (TREE_CODE (decl) == FUNCTION_DECL
5652 || TREE_TYPE (decl) == error_mark_node)
5653 /* No initialization required. */
5655 else if (DECL_EXTERNAL (decl)
5656 && ! (DECL_LANG_SPECIFIC (decl)
5657 && DECL_NOT_REALLY_EXTERN (decl)))
5660 DECL_INITIAL (decl) = init;
5662 /* A variable definition. */
5663 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5664 /* Initialize the local variable. */
5665 initialize_local_var (decl, init);
5667 /* If a variable is defined, and then a subsequent
5668 definition with external linkage is encountered, we will
5669 get here twice for the same variable. We want to avoid
5670 calling expand_static_init more than once. For variables
5671 that are not static data members, we can call
5672 expand_static_init only when we actually process the
5673 initializer. It is not legal to redeclare a static data
5674 member, so this issue does not arise in that case. */
5675 else if (var_definition_p && TREE_STATIC (decl))
5676 expand_static_init (decl, init);
5679 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5680 reference, insert it in the statement-tree now. */
5682 push_cleanup (decl, cleanup, false);
5685 processing_template_decl = saved_processing_template_decl;
5688 TREE_READONLY (decl) = 1;
5690 /* If this was marked 'used', be sure it will be output. */
5691 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5692 mark_decl_referenced (decl);
5695 /* This is here for a midend callback from c-common.c. */
5698 finish_decl (tree decl, tree init, tree asmspec_tree)
5700 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5703 /* Returns a declaration for a VAR_DECL as if:
5705 extern "C" TYPE NAME;
5707 had been seen. Used to create compiler-generated global
5711 declare_global_var (tree name, tree type)
5715 push_to_top_level ();
5716 decl = build_decl (VAR_DECL, name, type);
5717 TREE_PUBLIC (decl) = 1;
5718 DECL_EXTERNAL (decl) = 1;
5719 DECL_ARTIFICIAL (decl) = 1;
5720 /* If the user has explicitly declared this variable (perhaps
5721 because the code we are compiling is part of a low-level runtime
5722 library), then it is possible that our declaration will be merged
5723 with theirs by pushdecl. */
5724 decl = pushdecl (decl);
5725 finish_decl (decl, NULL_TREE, NULL_TREE);
5726 pop_from_top_level ();
5731 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5732 if "__cxa_atexit" is not being used) corresponding to the function
5733 to be called when the program exits. */
5736 get_atexit_fn_ptr_type (void)
5741 if (!atexit_fn_ptr_type_node)
5743 if (flag_use_cxa_atexit
5744 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5745 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5746 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5748 /* The parameter to "atexit" is "void (*)(void)". */
5749 arg_types = void_list_node;
5751 fn_type = build_function_type (void_type_node, arg_types);
5752 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5755 return atexit_fn_ptr_type_node;
5758 /* Returns a pointer to the `atexit' function. Note that if
5759 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5760 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5763 get_atexit_node (void)
5770 bool use_aeabi_atexit;
5775 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5777 /* The declaration for `__cxa_atexit' is:
5779 int __cxa_atexit (void (*)(void *), void *, void *)
5781 We build up the argument types and then then function type
5784 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5785 /* First, build the pointer-to-function type for the first
5787 fn_ptr_type = get_atexit_fn_ptr_type ();
5788 /* Then, build the rest of the argument types. */
5789 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5790 if (use_aeabi_atexit)
5792 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5793 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5797 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5798 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5800 /* And the final __cxa_atexit type. */
5801 fn_type = build_function_type (integer_type_node, arg_types);
5802 fn_ptr_type = build_pointer_type (fn_type);
5803 if (use_aeabi_atexit)
5804 name = "__aeabi_atexit";
5806 name = "__cxa_atexit";
5810 /* The declaration for `atexit' is:
5812 int atexit (void (*)());
5814 We build up the argument types and then then function type
5816 fn_ptr_type = get_atexit_fn_ptr_type ();
5817 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5818 /* Build the final atexit type. */
5819 fn_type = build_function_type (integer_type_node, arg_types);
5823 /* Now, build the function declaration. */
5824 push_lang_context (lang_name_c);
5825 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5826 mark_used (atexit_fndecl);
5827 pop_lang_context ();
5828 atexit_node = decay_conversion (atexit_fndecl);
5833 /* Returns the __dso_handle VAR_DECL. */
5836 get_dso_handle_node (void)
5838 if (dso_handle_node)
5839 return dso_handle_node;
5841 /* Declare the variable. */
5842 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5845 return dso_handle_node;
5848 /* Begin a new function with internal linkage whose job will be simply
5849 to destroy some particular variable. */
5851 static GTY(()) int start_cleanup_cnt;
5854 start_cleanup_fn (void)
5859 bool use_cxa_atexit = flag_use_cxa_atexit
5860 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5862 push_to_top_level ();
5864 /* No need to mangle this. */
5865 push_lang_context (lang_name_c);
5867 /* Build the name of the function. */
5868 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5869 /* Build the function declaration. */
5870 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5871 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5872 /* It's a function with internal linkage, generated by the
5874 TREE_PUBLIC (fndecl) = 0;
5875 DECL_ARTIFICIAL (fndecl) = 1;
5876 /* Make the function `inline' so that it is only emitted if it is
5877 actually needed. It is unlikely that it will be inlined, since
5878 it is only called via a function pointer, but we avoid unnecessary
5879 emissions this way. */
5880 DECL_INLINE (fndecl) = 1;
5881 DECL_DECLARED_INLINE_P (fndecl) = 1;
5882 DECL_INTERFACE_KNOWN (fndecl) = 1;
5883 /* Build the parameter. */
5888 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5889 DECL_CONTEXT (parmdecl) = fndecl;
5890 TREE_USED (parmdecl) = 1;
5891 DECL_ARGUMENTS (fndecl) = parmdecl;
5895 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5897 pop_lang_context ();
5899 return current_function_decl;
5902 /* Finish the cleanup function begun by start_cleanup_fn. */
5905 end_cleanup_fn (void)
5907 expand_or_defer_fn (finish_function (0));
5909 pop_from_top_level ();
5912 /* Generate code to handle the destruction of DECL, an object with
5913 static storage duration. */
5916 register_dtor_fn (tree decl)
5925 type = TREE_TYPE (decl);
5926 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5927 return void_zero_node;
5929 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5930 a class object, we can just pass the destructor to
5931 "__cxa_atexit"; we don't have to build a temporary function to do
5933 use_dtor = (flag_use_cxa_atexit
5934 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5935 && CLASS_TYPE_P (type));
5940 /* Find the destructor. */
5941 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5942 gcc_assert (idx >= 0);
5943 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5944 /* Make sure it is accessible. */
5945 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5949 /* Call build_cleanup before we enter the anonymous function so
5950 that any access checks will be done relative to the current
5951 scope, rather than the scope of the anonymous function. */
5952 build_cleanup (decl);
5954 /* Now start the function. */
5955 cleanup = start_cleanup_fn ();
5957 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5958 to the original function, rather than the anonymous one. That
5959 will make the back end think that nested functions are in use,
5960 which causes confusion. */
5961 push_deferring_access_checks (dk_no_check);
5962 fcall = build_cleanup (decl);
5963 pop_deferring_access_checks ();
5965 /* Create the body of the anonymous function. */
5966 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5967 finish_expr_stmt (fcall);
5968 finish_compound_stmt (compound_stmt);
5972 /* Call atexit with the cleanup function. */
5973 mark_used (cleanup);
5974 cleanup = build_address (cleanup);
5975 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5981 /* We must convert CLEANUP to the type that "__cxa_atexit"
5983 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5984 /* "__cxa_atexit" will pass the address of DECL to the
5985 cleanup function. */
5987 addr = build_address (decl);
5988 /* The declared type of the parameter to "__cxa_atexit" is
5989 "void *". For plain "T*", we could just let the
5990 machinery in build_function_call convert it -- but if the
5991 type is "cv-qualified T *", then we need to convert it
5992 before passing it in, to avoid spurious errors. */
5993 addr = build_nop (ptr_type_node, addr);
5996 /* Since the cleanup functions we build ignore the address
5997 they're given, there's no reason to pass the actual address
5998 in, and, in general, it's cheaper to pass NULL than any
6000 addr = null_pointer_node;
6001 args = tree_cons (NULL_TREE,
6002 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
6004 if (targetm.cxx.use_aeabi_atexit ())
6006 args = tree_cons (NULL_TREE, cleanup, args);
6007 args = tree_cons (NULL_TREE, addr, args);
6011 args = tree_cons (NULL_TREE, addr, args);
6012 args = tree_cons (NULL_TREE, cleanup, args);
6016 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6017 return build_function_call (get_atexit_node (), args);
6020 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6021 is its initializer. Generate code to handle the construction
6022 and destruction of DECL. */
6025 expand_static_init (tree decl, tree init)
6027 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6028 gcc_assert (TREE_STATIC (decl));
6030 /* Some variables require no initialization. */
6032 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6033 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6036 if (DECL_FUNCTION_SCOPE_P (decl))
6038 /* Emit code to perform this initialization but once. */
6039 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6040 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6041 tree guard, guard_addr;
6042 tree acquire_fn, release_fn, abort_fn;
6045 /* Emit code to perform this initialization but once. This code
6048 static <type> guard;
6049 if (!guard.first_byte) {
6050 if (__cxa_guard_acquire (&guard)) {
6053 // Do initialization.
6054 flag = true; __cxa_guard_release (&guard);
6055 // Register variable for destruction at end of program.
6057 if (!flag) __cxa_guard_abort (&guard);
6061 Note that the `flag' variable is only set to 1 *after* the
6062 initialization is complete. This ensures that an exception,
6063 thrown during the construction, will cause the variable to
6064 reinitialized when we pass through this code again, as per:
6068 If the initialization exits by throwing an exception, the
6069 initialization is not complete, so it will be tried again
6070 the next time control enters the declaration.
6072 This process should be thread-safe, too; multiple threads
6073 should not be able to initialize the variable more than
6076 /* Create the guard variable. */
6077 guard = get_guard (decl);
6079 /* This optimization isn't safe on targets with relaxed memory
6080 consistency. On such targets we force synchronization in
6081 __cxa_guard_acquire. */
6082 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6084 /* Begin the conditional initialization. */
6085 if_stmt = begin_if_stmt ();
6086 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6087 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6090 if (flag_threadsafe_statics)
6092 guard_addr = build_address (guard);
6094 acquire_fn = get_identifier ("__cxa_guard_acquire");
6095 release_fn = get_identifier ("__cxa_guard_release");
6096 abort_fn = get_identifier ("__cxa_guard_abort");
6097 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6099 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6101 tree vfntype = build_function_type (void_type_node, argtypes);
6102 acquire_fn = push_library_fn
6103 (acquire_fn, build_function_type (integer_type_node, argtypes));
6104 release_fn = push_library_fn (release_fn, vfntype);
6105 abort_fn = push_library_fn (abort_fn, vfntype);
6109 release_fn = identifier_global_value (release_fn);
6110 abort_fn = identifier_global_value (abort_fn);
6113 inner_if_stmt = begin_if_stmt ();
6114 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6117 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6118 begin = get_target_expr (boolean_false_node);
6119 flag = TARGET_EXPR_SLOT (begin);
6121 TARGET_EXPR_CLEANUP (begin)
6122 = build3 (COND_EXPR, void_type_node, flag,
6124 build_call_n (abort_fn, 1, guard_addr));
6125 CLEANUP_EH_ONLY (begin) = 1;
6127 /* Do the initialization itself. */
6128 init = add_stmt_to_compound (begin, init);
6129 init = add_stmt_to_compound
6130 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6131 init = add_stmt_to_compound
6132 (init, build_call_n (release_fn, 1, guard_addr));
6135 init = add_stmt_to_compound (init, set_guard (guard));
6137 /* Use atexit to register a function for destroying this static
6139 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6141 finish_expr_stmt (init);
6143 if (flag_threadsafe_statics)
6145 finish_compound_stmt (inner_then_clause);
6146 finish_then_clause (inner_if_stmt);
6147 finish_if_stmt (inner_if_stmt);
6150 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6152 finish_compound_stmt (then_clause);
6153 finish_then_clause (if_stmt);
6154 finish_if_stmt (if_stmt);
6158 static_aggregates = tree_cons (init, decl, static_aggregates);
6162 /* Make TYPE a complete type based on INITIAL_VALUE.
6163 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6164 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6165 3 if the initializer list is empty (in pedantic mode). */
6168 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6171 tree type, elt_type;
6175 unsigned HOST_WIDE_INT i;
6178 /* An array of character type can be initialized from a
6179 brace-enclosed string constant.
6181 FIXME: this code is duplicated from reshape_init. Probably
6182 we should just call reshape_init here? */
6183 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6184 && TREE_CODE (initial_value) == CONSTRUCTOR
6185 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6187 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6188 tree value = VEC_index (constructor_elt, v, 0)->value;
6190 if (TREE_CODE (value) == STRING_CST
6191 && VEC_length (constructor_elt, v) == 1)
6192 initial_value = value;
6195 /* If any of the elements are parameter packs, we can't actually
6196 complete this type now because the array size is dependent. */
6197 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6199 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6202 if (PACK_EXPANSION_P (value))
6208 failure = complete_array_type (ptype, initial_value, do_default);
6210 /* We can create the array before the element type is complete, which
6211 means that we didn't have these two bits set in the original type
6212 either. In completing the type, we are expected to propagate these
6213 bits. See also complete_type which does the same thing for arrays
6216 if (TYPE_DOMAIN (type))
6218 elt_type = TREE_TYPE (type);
6219 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6220 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6221 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6227 /* Return zero if something is declared to be a member of type
6228 CTYPE when in the context of CUR_TYPE. STRING is the error
6229 message to print in that case. Otherwise, quietly return 1. */
6232 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6234 if (ctype && ctype != cur_type)
6236 if (flags == DTOR_FLAG)
6237 error ("destructor for alien class %qT cannot be a member", ctype);
6239 error ("constructor for alien class %qT cannot be a member", ctype);
6245 /* Subroutine of `grokdeclarator'. */
6247 /* Generate errors possibly applicable for a given set of specifiers.
6248 This is for ARM $7.1.2. */
6251 bad_specifiers (tree object,
6260 error ("%qD declared as a %<virtual%> %s", object, type);
6262 error ("%qD declared as an %<inline%> %s", object, type);
6264 error ("%<const%> and %<volatile%> function specifiers on "
6265 "%qD invalid in %s declaration",
6268 error ("%q+D declared as a friend", object);
6270 && (TREE_CODE (object) == TYPE_DECL
6271 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6272 && !TYPE_REFFN_P (TREE_TYPE (object))
6273 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6274 error ("%q+D declared with an exception specification", object);
6277 /* DECL is a member function or static data member and is presently
6278 being defined. Check that the definition is taking place in a
6282 check_class_member_definition_namespace (tree decl)
6284 /* These checks only apply to member functions and static data
6286 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6287 || TREE_CODE (decl) == VAR_DECL);
6288 /* We check for problems with specializations in pt.c in
6289 check_specialization_namespace, where we can issue better
6291 if (processing_specialization)
6293 /* There are no restrictions on the placement of
6294 explicit instantiations. */
6295 if (processing_explicit_instantiation)
6299 A member function definition that appears outside of the
6300 class definition shall appear in a namespace scope enclosing
6301 the class definition.
6305 The definition for a static data member shall appear in a
6306 namespace scope enclosing the member's class definition. */
6307 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6308 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6309 decl, DECL_CONTEXT (decl));
6312 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6313 METHOD_TYPE for a non-static member function; QUALS are the
6314 cv-qualifiers that apply to the function. */
6317 build_this_parm (tree type, cp_cv_quals quals)
6322 cp_cv_quals this_quals;
6324 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6325 /* The `this' parameter is implicitly `const'; it cannot be
6327 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6328 qual_type = cp_build_qualified_type (this_type, this_quals);
6329 parm = build_artificial_parm (this_identifier, qual_type);
6330 cp_apply_type_quals_to_decl (this_quals, parm);
6334 /* CTYPE is class type, or null if non-class.
6335 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6337 DECLARATOR is the function's name.
6338 PARMS is a chain of PARM_DECLs for the function.
6339 VIRTUALP is truthvalue of whether the function is virtual or not.
6340 FLAGS are to be passed through to `grokclassfn'.
6341 QUALS are qualifiers indicating whether the function is `const'
6343 RAISES is a list of exceptions that this function can raise.
6344 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6345 not look, and -1 if we should not call `grokclassfn' at all.
6347 SFK is the kind of special function (if any) for the new function.
6349 Returns `NULL_TREE' if something goes wrong, after issuing
6350 applicable error messages. */
6353 grokfndecl (tree ctype,
6357 tree orig_declarator,
6359 enum overload_flags flags,
6366 special_function_kind sfk,
6373 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6377 type = build_exception_variant (type, raises);
6379 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6380 if (TREE_CODE (type) == METHOD_TYPE)
6383 parm = build_this_parm (type, quals);
6384 TREE_CHAIN (parm) = parms;
6387 DECL_ARGUMENTS (decl) = parms;
6388 /* Propagate volatile out from type to decl. */
6389 if (TYPE_VOLATILE (type))
6390 TREE_THIS_VOLATILE (decl) = 1;
6392 /* Setup decl according to sfk. */
6395 case sfk_constructor:
6396 case sfk_copy_constructor:
6397 DECL_CONSTRUCTOR_P (decl) = 1;
6399 case sfk_destructor:
6400 DECL_DESTRUCTOR_P (decl) = 1;
6406 /* If pointers to member functions use the least significant bit to
6407 indicate whether a function is virtual, ensure a pointer
6408 to this function will have that bit clear. */
6409 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6410 && TREE_CODE (type) == METHOD_TYPE
6411 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6412 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6415 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6419 ("defining explicit specialization %qD in friend declaration",
6423 tree fns = TREE_OPERAND (orig_declarator, 0);
6424 tree args = TREE_OPERAND (orig_declarator, 1);
6426 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6428 /* Something like `template <class T> friend void f<T>()'. */
6429 error ("invalid use of template-id %qD in declaration "
6430 "of primary template",
6436 /* A friend declaration of the form friend void f<>(). Record
6437 the information in the TEMPLATE_ID_EXPR. */
6438 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6440 if (TREE_CODE (fns) == COMPONENT_REF)
6442 /* Due to bison parser ickiness, we will have already looked
6443 up an operator_name or PFUNCNAME within the current class
6444 (see template_id in parse.y). If the current class contains
6445 such a name, we'll get a COMPONENT_REF here. Undo that. */
6447 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6448 == current_class_type);
6449 fns = TREE_OPERAND (fns, 1);
6451 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6452 || TREE_CODE (fns) == OVERLOAD);
6453 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6455 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6456 if (TREE_PURPOSE (t)
6457 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6459 error ("default arguments are not allowed in declaration "
6460 "of friend template specialization %qD",
6467 error ("%<inline%> is not allowed in declaration of friend "
6468 "template specialization %qD",
6475 /* If this decl has namespace scope, set that up. */
6477 set_decl_namespace (decl, in_namespace, friendp);
6479 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6481 /* `main' and builtins have implicit 'C' linkage. */
6482 if ((MAIN_NAME_P (declarator)
6483 || (IDENTIFIER_LENGTH (declarator) > 10
6484 && IDENTIFIER_POINTER (declarator)[0] == '_'
6485 && IDENTIFIER_POINTER (declarator)[1] == '_'
6486 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6487 && current_lang_name == lang_name_cplusplus
6488 && ctype == NULL_TREE
6489 /* NULL_TREE means global namespace. */
6490 && DECL_CONTEXT (decl) == NULL_TREE)
6491 SET_DECL_LANGUAGE (decl, lang_c);
6493 /* Should probably propagate const out from type to decl I bet (mrs). */
6496 DECL_STATIC_FUNCTION_P (decl) = 1;
6497 DECL_CONTEXT (decl) = ctype;
6502 DECL_CONTEXT (decl) = ctype;
6504 check_class_member_definition_namespace (decl);
6507 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6509 if (processing_template_decl)
6510 error ("cannot declare %<::main%> to be a template");
6512 error ("cannot declare %<::main%> to be inline");
6514 error ("cannot declare %<::main%> to be static");
6519 /* Members of anonymous types and local classes have no linkage; make
6520 them internal. If a typedef is made later, this will be changed. */
6521 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6522 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6527 /* [basic.link]: A name with no linkage (notably, the name of a class
6528 or enumeration declared in a local scope) shall not be used to
6529 declare an entity with linkage.
6531 Only check this for public decls for now. See core 319, 389. */
6532 t = no_linkage_check (TREE_TYPE (decl),
6533 /*relaxed_p=*/false);
6536 if (TYPE_ANONYMOUS_P (t))
6538 if (DECL_EXTERN_C_P (decl))
6539 /* Allow this; it's pretty common in C. */;
6542 pedwarn ("non-local function %q#D uses anonymous type",
6544 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6545 pedwarn ("%q+#D does not refer to the unqualified "
6546 "type, so it is not used for linkage",
6551 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6555 TREE_PUBLIC (decl) = publicp;
6558 DECL_INTERFACE_KNOWN (decl) = 1;
6559 DECL_NOT_REALLY_EXTERN (decl) = 1;
6562 /* If the declaration was declared inline, mark it as such. */
6564 DECL_DECLARED_INLINE_P (decl) = 1;
6565 /* We inline functions that are explicitly declared inline, or, when
6566 the user explicitly asks us to, all functions. */
6567 if (DECL_DECLARED_INLINE_P (decl)
6568 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6569 DECL_INLINE (decl) = 1;
6571 DECL_EXTERNAL (decl) = 1;
6572 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6575 ? G_("static member function %qD cannot have cv-qualifier")
6576 : G_("non-member function %qD cannot have cv-qualifier"),
6578 quals = TYPE_UNQUALIFIED;
6581 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6582 && !grok_op_properties (decl, /*complain=*/true))
6585 if (ctype && decl_function_context (decl))
6586 DECL_NO_STATIC_CHAIN (decl) = 1;
6589 /* Make the init_value nonzero so pushdecl knows this is not
6590 tentative. error_mark_node is replaced later with the BLOCK. */
6591 DECL_INITIAL (decl) = error_mark_node;
6593 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6594 TREE_NOTHROW (decl) = 1;
6596 /* Caller will do the rest of this. */
6600 if (ctype != NULL_TREE)
6601 grokclassfn (ctype, decl, flags);
6603 decl = check_explicit_specialization (orig_declarator, decl,
6606 4 * (friendp != 0));
6607 if (decl == error_mark_node)
6612 cplus_decl_attributes (&decl, *attrlist, 0);
6613 *attrlist = NULL_TREE;
6616 /* Check main's type after attributes have been applied. */
6617 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6619 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6622 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6624 error ("%<::main%> must return %<int%>");
6625 newtype = build_function_type (integer_type_node, oldtypeargs);
6626 TREE_TYPE (decl) = newtype;
6628 check_main_parameter_types (decl);
6631 if (ctype != NULL_TREE
6632 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6635 tree old_decl = check_classfn (ctype, decl,
6636 (processing_template_decl
6637 > template_class_depth (ctype))
6638 ? current_template_parms
6641 if (old_decl == error_mark_node)
6649 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6650 /* Because grokfndecl is always supposed to return a
6651 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6652 here. We depend on our callers to figure out that its
6653 really a template that's being returned. */
6654 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6656 if (DECL_STATIC_FUNCTION_P (old_decl)
6657 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6658 /* Remove the `this' parm added by grokclassfn.
6659 XXX Isn't this done in start_function, too? */
6660 revert_static_member_fn (decl);
6661 if (DECL_ARTIFICIAL (old_decl))
6663 error ("definition of implicitly-declared %qD", old_decl);
6667 /* Since we've smashed OLD_DECL to its
6668 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6669 if (TREE_CODE (decl) == TEMPLATE_DECL)
6670 decl = DECL_TEMPLATE_RESULT (decl);
6672 /* Attempt to merge the declarations. This can fail, in
6673 the case of some invalid specialization declarations. */
6674 pushed_scope = push_scope (ctype);
6675 ok = duplicate_decls (decl, old_decl, friendp);
6677 pop_scope (pushed_scope);
6680 error ("no %q#D member function declared in class %qT",
6688 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6691 if (ctype == NULL_TREE || check)
6695 DECL_VIRTUAL_P (decl) = 1;
6700 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6701 the linkage that DECL will receive in the object file. */
6704 set_linkage_for_static_data_member (tree decl)
6706 /* A static data member always has static storage duration and
6707 external linkage. Note that static data members are forbidden in
6708 local classes -- the only situation in which a class has
6709 non-external linkage. */
6710 TREE_PUBLIC (decl) = 1;
6711 TREE_STATIC (decl) = 1;
6712 /* For non-template classes, static data members are always put
6713 out in exactly those files where they are defined, just as
6714 with ordinary namespace-scope variables. */
6715 if (!processing_template_decl)
6716 DECL_INTERFACE_KNOWN (decl) = 1;
6719 /* Create a VAR_DECL named NAME with the indicated TYPE.
6721 If SCOPE is non-NULL, it is the class type or namespace containing
6722 the variable. If SCOPE is NULL, the variable should is created in
6723 the innermost enclosings scope. */
6726 grokvardecl (tree type,
6728 const cp_decl_specifier_seq *declspecs,
6734 tree explicit_scope;
6736 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6738 /* Compute the scope in which to place the variable, but remember
6739 whether or not that scope was explicitly specified by the user. */
6740 explicit_scope = scope;
6743 /* An explicit "extern" specifier indicates a namespace-scope
6745 if (declspecs->storage_class == sc_extern)
6746 scope = current_namespace;
6747 else if (!at_function_scope_p ())
6748 scope = current_scope ();
6752 && (/* If the variable is a namespace-scope variable declared in a
6753 template, we need DECL_LANG_SPECIFIC. */
6754 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6755 /* Similarly for namespace-scope variables with language linkage
6757 || (TREE_CODE (scope) == NAMESPACE_DECL
6758 && current_lang_name != lang_name_cplusplus)
6759 /* Similarly for static data members. */
6761 decl = build_lang_decl (VAR_DECL, name, type);
6763 decl = build_decl (VAR_DECL, name, type);
6765 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6766 set_decl_namespace (decl, explicit_scope, 0);
6768 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6770 if (declspecs->storage_class == sc_extern)
6772 DECL_THIS_EXTERN (decl) = 1;
6773 DECL_EXTERNAL (decl) = !initialized;
6776 if (DECL_CLASS_SCOPE_P (decl))
6778 set_linkage_for_static_data_member (decl);
6779 /* This function is only called with out-of-class definitions. */
6780 DECL_EXTERNAL (decl) = 0;
6781 check_class_member_definition_namespace (decl);
6783 /* At top level, either `static' or no s.c. makes a definition
6784 (perhaps tentative), and absence of `static' makes it public. */
6785 else if (toplevel_bindings_p ())
6787 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6788 && (DECL_THIS_EXTERN (decl) || ! constp));
6789 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6791 /* Not at top level, only `static' makes a static definition. */
6794 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6795 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6798 if (declspecs->specs[(int)ds_thread])
6799 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6801 if (TREE_PUBLIC (decl))
6803 /* [basic.link]: A name with no linkage (notably, the name of a class
6804 or enumeration declared in a local scope) shall not be used to
6805 declare an entity with linkage.
6807 Only check this for public decls for now. */
6808 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6811 if (TYPE_ANONYMOUS_P (t))
6813 if (DECL_EXTERN_C_P (decl))
6814 /* Allow this; it's pretty common in C. */
6818 /* DRs 132, 319 and 389 seem to indicate types with
6819 no linkage can only be used to declare extern "C"
6820 entities. Since it's not always an error in the
6821 ISO C++ 90 Standard, we only issue a warning. */
6822 warning (0, "non-local variable %q#D uses anonymous type",
6824 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6825 warning (0, "%q+#D does not refer to the unqualified "
6826 "type, so it is not used for linkage",
6831 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6835 DECL_INTERFACE_KNOWN (decl) = 1;
6840 /* Create and return a canonical pointer to member function type, for
6841 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6844 build_ptrmemfunc_type (tree type)
6848 tree unqualified_variant = NULL_TREE;
6850 if (type == error_mark_node)
6853 /* If a canonical type already exists for this type, use it. We use
6854 this method instead of type_hash_canon, because it only does a
6855 simple equality check on the list of field members. */
6857 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6860 /* Make sure that we always have the unqualified pointer-to-member
6862 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6864 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6866 t = make_aggr_type (RECORD_TYPE);
6867 xref_basetypes (t, NULL_TREE);
6869 /* Let the front end know this is a pointer to member function... */
6870 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6871 /* ... and not really an aggregate. */
6872 SET_IS_AGGR_TYPE (t, 0);
6874 field = build_decl (FIELD_DECL, pfn_identifier, type);
6877 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6878 TREE_CHAIN (field) = fields;
6881 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6883 /* Zap out the name so that the back end will give us the debugging
6884 information for this anonymous RECORD_TYPE. */
6885 TYPE_NAME (t) = NULL_TREE;
6887 /* If this is not the unqualified form of this pointer-to-member
6888 type, set the TYPE_MAIN_VARIANT for this type to be the
6889 unqualified type. Since they are actually RECORD_TYPEs that are
6890 not variants of each other, we must do this manually. */
6891 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6893 t = build_qualified_type (t, cp_type_quals (type));
6894 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6895 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6896 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6899 /* Cache this pointer-to-member type so that we can find it again
6901 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6903 /* Managing canonical types for the RECORD_TYPE behind a
6904 pointer-to-member function is a nightmare, so use structural
6905 equality for now. */
6906 SET_TYPE_STRUCTURAL_EQUALITY (t);
6911 /* Create and return a pointer to data member type. */
6914 build_ptrmem_type (tree class_type, tree member_type)
6916 if (TREE_CODE (member_type) == METHOD_TYPE)
6920 arg_types = TYPE_ARG_TYPES (member_type);
6921 class_type = (cp_build_qualified_type
6923 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6925 = build_method_type_directly (class_type,
6926 TREE_TYPE (member_type),
6927 TREE_CHAIN (arg_types));
6928 return build_ptrmemfunc_type (build_pointer_type (member_type));
6932 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6933 return build_offset_type (class_type, member_type);
6937 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6938 Check to see that the definition is valid. Issue appropriate error
6939 messages. Return 1 if the definition is particularly bad, or 0
6943 check_static_variable_definition (tree decl, tree type)
6945 /* Motion 10 at San Diego: If a static const integral data member is
6946 initialized with an integral constant expression, the initializer
6947 may appear either in the declaration (within the class), or in
6948 the definition, but not both. If it appears in the class, the
6949 member is a member constant. The file-scope definition is always
6951 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6953 error ("invalid in-class initialization of static data member "
6954 "of non-integral type %qT",
6956 /* If we just return the declaration, crashes will sometimes
6957 occur. We therefore return void_type_node, as if this were a
6958 friend declaration, to cause callers to completely ignore
6959 this declaration. */
6962 else if (!CP_TYPE_CONST_P (type))
6963 error ("ISO C++ forbids in-class initialization of non-const "
6964 "static member %qD",
6966 else if (pedantic && !INTEGRAL_TYPE_P (type))
6967 pedwarn ("ISO C++ forbids initialization of member constant "
6968 "%qD of non-integral type %qT", decl, type);
6973 /* Given the SIZE (i.e., number of elements) in an array, compute an
6974 appropriate index type for the array. If non-NULL, NAME is the
6975 name of the thing being declared. */
6978 compute_array_index_type (tree name, tree size)
6982 tree abi_1_itype = NULL_TREE;
6984 if (error_operand_p (size))
6985 return error_mark_node;
6987 type = TREE_TYPE (size);
6988 /* The array bound must be an integer type. */
6989 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6992 error ("size of array %qD has non-integral type %qT", name, type);
6994 error ("size of array has non-integral type %qT", type);
6995 size = integer_one_node;
6996 type = TREE_TYPE (size);
6999 if (value_dependent_expression_p (size))
7001 /* We cannot do any checking for a value-dependent SIZE. Just
7002 build the index type and mark that it requires structural
7004 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7005 size, integer_one_node));
7006 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7010 if (!abi_version_at_least (2) && processing_template_decl)
7011 /* For abi-1, we handled all instances in templates the same way,
7012 even when they were non-dependent. This effects the manglings
7013 produced. So, we do the normal checking for non-dependent
7014 sizes, but at the end we'll return the same type that abi-1
7015 would have, but with TYPE_CANONICAL set to the "right"
7016 value that the current ABI would provide. */
7017 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7018 size, integer_one_node));
7020 /* The size might be the result of a cast. */
7021 STRIP_TYPE_NOPS (size);
7023 /* It might be a const variable or enumeration constant. */
7024 size = integral_constant_value (size);
7026 /* Normally, the array-bound will be a constant. */
7027 if (TREE_CODE (size) == INTEGER_CST)
7029 /* Check to see if the array bound overflowed. Make that an
7030 error, no matter how generous we're being. */
7031 constant_expression_error (size);
7033 /* An array must have a positive number of elements. */
7034 if (INT_CST_LT (size, integer_zero_node))
7037 error ("size of array %qD is negative", name);
7039 error ("size of array is negative");
7040 size = integer_one_node;
7042 /* As an extension we allow zero-sized arrays. We always allow
7043 them in system headers because glibc uses them. */
7044 else if (integer_zerop (size) && pedantic && !in_system_header)
7047 pedwarn ("ISO C++ forbids zero-size array %qD", name);
7049 pedwarn ("ISO C++ forbids zero-size array");
7052 else if (TREE_CONSTANT (size))
7054 /* `(int) &fn' is not a valid array bound. */
7056 error ("size of array %qD is not an integral constant-expression",
7059 error ("size of array is not an integral constant-expression");
7060 size = integer_one_node;
7062 else if (pedantic && warn_vla != 0)
7065 pedwarn ("ISO C++ forbids variable length array %qD", name);
7067 pedwarn ("ISO C++ forbids variable length array");
7069 else if (warn_vla > 0)
7073 "variable length array %qD is used", name);
7076 "variable length array is used");
7079 if (processing_template_decl && !TREE_CONSTANT (size))
7080 /* A variable sized array. */
7081 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7084 HOST_WIDE_INT saved_processing_template_decl;
7086 /* Compute the index of the largest element in the array. It is
7087 one less than the number of elements in the array. We save
7088 and restore PROCESSING_TEMPLATE_DECL so that computations in
7089 cp_build_binary_op will be appropriately folded. */
7090 saved_processing_template_decl = processing_template_decl;
7091 processing_template_decl = 0;
7092 itype = cp_build_binary_op (MINUS_EXPR,
7093 cp_convert (ssizetype, size),
7094 cp_convert (ssizetype, integer_one_node));
7095 itype = fold (itype);
7096 processing_template_decl = saved_processing_template_decl;
7098 if (!TREE_CONSTANT (itype))
7099 /* A variable sized array. */
7100 itype = variable_size (itype);
7101 /* Make sure that there was no overflow when creating to a signed
7102 index type. (For example, on a 32-bit machine, an array with
7103 size 2^32 - 1 is too big.) */
7104 else if (TREE_CODE (itype) == INTEGER_CST
7105 && TREE_OVERFLOW (itype))
7107 error ("overflow in array dimension");
7108 TREE_OVERFLOW (itype) = 0;
7112 /* Create and return the appropriate index type. */
7115 tree t = build_index_type (itype);
7116 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7120 return build_index_type (itype);
7123 /* Returns the scope (if any) in which the entity declared by
7124 DECLARATOR will be located. If the entity was declared with an
7125 unqualified name, NULL_TREE is returned. */
7128 get_scope_of_declarator (const cp_declarator *declarator)
7130 while (declarator && declarator->kind != cdk_id)
7131 declarator = declarator->declarator;
7133 /* If the declarator-id is a SCOPE_REF, the scope in which the
7134 declaration occurs is the first operand. */
7136 && declarator->u.id.qualifying_scope)
7137 return declarator->u.id.qualifying_scope;
7139 /* Otherwise, the declarator is not a qualified name; the entity will
7140 be declared in the current scope. */
7144 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7145 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7149 create_array_type_for_decl (tree name, tree type, tree size)
7151 tree itype = NULL_TREE;
7152 const char* error_msg;
7154 /* If things have already gone awry, bail now. */
7155 if (type == error_mark_node || size == error_mark_node)
7156 return error_mark_node;
7158 /* Assume that everything will go OK. */
7161 /* There are some types which cannot be array elements. */
7162 switch (TREE_CODE (type))
7165 error_msg = "array of void";
7169 error_msg = "array of functions";
7172 case REFERENCE_TYPE:
7173 error_msg = "array of references";
7177 error_msg = "array of function members";
7184 /* If something went wrong, issue an error-message and return. */
7188 error ("declaration of %qD as %s", name, error_msg);
7190 error ("creating %s", error_msg);
7192 return error_mark_node;
7197 The constant expressions that specify the bounds of the arrays
7198 can be omitted only for the first member of the sequence. */
7199 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7202 error ("declaration of %qD as multidimensional array must "
7203 "have bounds for all dimensions except the first",
7206 error ("multidimensional array must have bounds for all "
7207 "dimensions except the first");
7209 return error_mark_node;
7212 /* Figure out the index type for the array. */
7214 itype = compute_array_index_type (name, size);
7217 T is called the array element type; this type shall not be [...] an
7218 abstract class type. */
7219 abstract_virtuals_error (name, type);
7221 return build_cplus_array_type (type, itype);
7224 /* Check that it's OK to declare a function with the indicated TYPE.
7225 SFK indicates the kind of special function (if any) that this
7226 function is. OPTYPE is the type given in a conversion operator
7227 declaration, or the class type for a constructor/destructor.
7228 Returns the actual return type of the function; that
7229 may be different than TYPE if an error occurs, or for certain
7230 special functions. */
7233 check_special_function_return_type (special_function_kind sfk,
7239 case sfk_constructor:
7241 error ("return type specification for constructor invalid");
7243 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7244 type = build_pointer_type (optype);
7246 type = void_type_node;
7249 case sfk_destructor:
7251 error ("return type specification for destructor invalid");
7252 /* We can't use the proper return type here because we run into
7253 problems with ambiguous bases and covariant returns.
7254 Java classes are left unchanged because (void *) isn't a valid
7255 Java type, and we don't want to change the Java ABI. */
7256 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7257 type = build_pointer_type (void_type_node);
7259 type = void_type_node;
7262 case sfk_conversion:
7264 error ("return type specified for %<operator %T%>", optype);
7275 /* A variable or data member (whose unqualified name is IDENTIFIER)
7276 has been declared with the indicated TYPE. If the TYPE is not
7277 acceptable, issue an error message and return a type to use for
7278 error-recovery purposes. */
7281 check_var_type (tree identifier, tree type)
7283 if (VOID_TYPE_P (type))
7286 error ("unnamed variable or field declared void");
7287 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7289 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7290 error ("variable or field %qE declared void", identifier);
7293 error ("variable or field declared void");
7294 type = error_mark_node;
7300 /* Given declspecs and a declarator (abstract or otherwise), determine
7301 the name and type of the object declared and construct a DECL node
7304 DECLSPECS points to the representation of declaration-specifier
7305 sequence that precedes declarator.
7307 DECL_CONTEXT says which syntactic context this declaration is in:
7308 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7309 FUNCDEF for a function definition. Like NORMAL but a few different
7310 error messages in each case. Return value may be zero meaning
7311 this definition is too screwy to try to parse.
7312 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7313 handle member functions (which have FIELD context).
7314 Return value may be zero meaning this definition is too screwy to
7316 PARM for a parameter declaration (either within a function prototype
7317 or before a function body). Make a PARM_DECL, or return void_type_node.
7318 CATCHPARM for a parameter declaration before a catch clause.
7319 TYPENAME if for a typename (in a cast or sizeof).
7320 Don't make a DECL node; just return the ..._TYPE node.
7321 FIELD for a struct or union field; make a FIELD_DECL.
7322 BITFIELD for a field with specified width.
7323 INITIALIZED is 1 if the decl has an initializer.
7325 ATTRLIST is a pointer to the list of attributes, which may be NULL
7326 if there are none; *ATTRLIST may be modified if attributes from inside
7327 the declarator should be applied to the declaration.
7329 When this function is called, scoping variables (such as
7330 CURRENT_CLASS_TYPE) should reflect the scope in which the
7331 declaration occurs, not the scope in which the new declaration will
7332 be placed. For example, on:
7336 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7339 Returns a DECL (if a declarator is present), a TYPE (if there is no
7340 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7344 grokdeclarator (const cp_declarator *declarator,
7345 const cp_decl_specifier_seq *declspecs,
7346 enum decl_context decl_context,
7350 tree type = NULL_TREE;
7352 int virtualp, explicitp, friendp, inlinep, staticp;
7353 int explicit_int = 0;
7354 int explicit_char = 0;
7355 int defaulted_int = 0;
7356 tree dependent_name = NULL_TREE;
7358 tree typedef_decl = NULL_TREE;
7359 const char *name = NULL;
7360 tree typedef_type = NULL_TREE;
7361 /* True if this declarator is a function definition. */
7362 bool funcdef_flag = false;
7363 cp_declarator_kind innermost_code = cdk_error;
7366 /* See the code below that used this. */
7367 tree decl_attr = NULL_TREE;
7370 /* Keep track of what sort of function is being processed
7371 so that we can warn about default return values, or explicit
7372 return values which do not match prescribed defaults. */
7373 special_function_kind sfk = sfk_none;
7375 tree dname = NULL_TREE;
7376 tree ctor_return_type = NULL_TREE;
7377 enum overload_flags flags = NO_SPECIAL;
7378 /* cv-qualifiers that apply to the declarator, for a declaration of
7379 a member function. */
7380 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7381 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7383 tree raises = NULL_TREE;
7384 int template_count = 0;
7385 tree returned_attrs = NULL_TREE;
7386 tree parms = NULL_TREE;
7387 const cp_declarator *id_declarator;
7388 /* The unqualified name of the declarator; either an
7389 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7390 tree unqualified_id;
7391 /* The class type, if any, in which this entity is located,
7392 or NULL_TREE if none. Note that this value may be different from
7393 the current class type; for example if an attempt is made to declare
7394 "A::f" inside "B", this value will be "A". */
7395 tree ctype = current_class_type;
7396 /* The NAMESPACE_DECL for the namespace in which this entity is
7397 located. If an unqualified name is used to declare the entity,
7398 this value will be NULL_TREE, even if the entity is located at
7400 tree in_namespace = NULL_TREE;
7401 cp_storage_class storage_class;
7402 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7403 bool type_was_error_mark_node = false;
7404 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7405 bool set_no_warning = false;
7407 signed_p = declspecs->specs[(int)ds_signed];
7408 unsigned_p = declspecs->specs[(int)ds_unsigned];
7409 short_p = declspecs->specs[(int)ds_short];
7410 long_p = declspecs->specs[(int)ds_long];
7411 longlong = declspecs->specs[(int)ds_long] >= 2;
7412 thread_p = declspecs->specs[(int)ds_thread];
7414 if (decl_context == FUNCDEF)
7415 funcdef_flag = true, decl_context = NORMAL;
7416 else if (decl_context == MEMFUNCDEF)
7417 funcdef_flag = true, decl_context = FIELD;
7418 else if (decl_context == BITFIELD)
7419 bitfield = 1, decl_context = FIELD;
7421 /* Look inside a declarator for the name being declared
7422 and get it as a string, for an error message. */
7423 for (id_declarator = declarator;
7425 id_declarator = id_declarator->declarator)
7427 if (id_declarator->kind != cdk_id)
7428 innermost_code = id_declarator->kind;
7430 switch (id_declarator->kind)
7433 if (id_declarator->declarator
7434 && id_declarator->declarator->kind == cdk_id)
7436 sfk = id_declarator->declarator->u.id.sfk;
7437 if (sfk == sfk_destructor)
7444 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7445 tree decl = id_declarator->u.id.unqualified_name;
7448 if (qualifying_scope)
7450 if (at_function_scope_p ())
7454 A declarator-id shall not be qualified except
7457 None of the cases are permitted in block
7459 if (qualifying_scope == global_namespace)
7460 error ("invalid use of qualified-name %<::%D%>",
7462 else if (TYPE_P (qualifying_scope))
7463 error ("invalid use of qualified-name %<%T::%D%>",
7464 qualifying_scope, decl);
7466 error ("invalid use of qualified-name %<%D::%D%>",
7467 qualifying_scope, decl);
7468 return error_mark_node;
7470 else if (TYPE_P (qualifying_scope))
7472 ctype = qualifying_scope;
7473 if (innermost_code != cdk_function
7474 && current_class_type
7475 && !UNIQUELY_DERIVED_FROM_P (ctype,
7476 current_class_type))
7478 error ("type %qT is not derived from type %qT",
7479 ctype, current_class_type);
7480 return error_mark_node;
7483 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7484 in_namespace = qualifying_scope;
7486 switch (TREE_CODE (decl))
7492 if (innermost_code != cdk_function)
7494 error ("declaration of %qD as non-function", decl);
7495 return error_mark_node;
7497 else if (!qualifying_scope
7498 && !(current_class_type && at_class_scope_p ()))
7500 error ("declaration of %qD as non-member", decl);
7501 return error_mark_node;
7504 type = TREE_OPERAND (decl, 0);
7505 name = IDENTIFIER_POINTER (constructor_name (type));
7510 case TEMPLATE_ID_EXPR:
7512 tree fns = TREE_OPERAND (decl, 0);
7515 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7517 gcc_assert (is_overloaded_fn (dname));
7518 dname = DECL_NAME (get_first_fn (dname));
7523 case IDENTIFIER_NODE:
7524 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7527 if (C_IS_RESERVED_WORD (dname))
7529 error ("declarator-id missing; using reserved word %qD",
7531 name = IDENTIFIER_POINTER (dname);
7533 else if (!IDENTIFIER_TYPENAME_P (dname))
7534 name = IDENTIFIER_POINTER (dname);
7537 gcc_assert (flags == NO_SPECIAL);
7538 flags = TYPENAME_FLAG;
7539 ctor_return_type = TREE_TYPE (dname);
7540 sfk = sfk_conversion;
7541 if (is_typename_at_global_scope (dname))
7542 name = IDENTIFIER_POINTER (dname);
7544 name = "<invalid operator>";
7561 return error_mark_node;
7566 if (id_declarator->kind == cdk_id)
7572 The declarator in a function-definition shall have the form
7573 D1 ( parameter-declaration-clause) ... */
7574 if (funcdef_flag && innermost_code != cdk_function)
7576 error ("function definition does not declare parameters");
7577 return error_mark_node;
7580 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7581 && innermost_code != cdk_function
7582 && ! (ctype && !declspecs->any_specifiers_p))
7584 error ("declaration of %qD as non-function", dname);
7585 return error_mark_node;
7588 /* Anything declared one level down from the top level
7589 must be one of the parameters of a function
7590 (because the body is at least two levels down). */
7592 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7593 by not allowing C++ class definitions to specify their parameters
7594 with xdecls (must be spec.d in the parmlist).
7596 Since we now wait to push a class scope until we are sure that
7597 we are in a legitimate method context, we must set oldcname
7598 explicitly (since current_class_name is not yet alive).
7600 We also want to avoid calling this a PARM if it is in a namespace. */
7602 if (decl_context == NORMAL && !toplevel_bindings_p ())
7604 struct cp_binding_level *b = current_binding_level;
7605 current_binding_level = b->level_chain;
7606 if (current_binding_level != 0 && toplevel_bindings_p ())
7607 decl_context = PARM;
7608 current_binding_level = b;
7612 name = decl_context == PARM ? "parameter" : "type name";
7614 /* If there were multiple types specified in the decl-specifier-seq,
7615 issue an error message. */
7616 if (declspecs->multiple_types_p)
7618 error ("two or more data types in declaration of %qs", name);
7619 return error_mark_node;
7622 if (declspecs->conflicting_specifiers_p)
7624 error ("conflicting specifiers in declaration of %qs", name);
7625 return error_mark_node;
7628 /* Extract the basic type from the decl-specifier-seq. */
7629 type = declspecs->type;
7630 if (type == error_mark_node)
7633 type_was_error_mark_node = true;
7635 /* If the entire declaration is itself tagged as deprecated then
7636 suppress reports of deprecated items. */
7637 if (type && TREE_DEPRECATED (type)
7638 && deprecated_state != DEPRECATED_SUPPRESS)
7639 warn_deprecated_use (type);
7640 if (type && TREE_CODE (type) == TYPE_DECL)
7642 typedef_decl = type;
7643 type = TREE_TYPE (typedef_decl);
7644 if (TREE_DEPRECATED (type)
7645 && DECL_ARTIFICIAL (typedef_decl)
7646 && deprecated_state != DEPRECATED_SUPPRESS)
7647 warn_deprecated_use (type);
7649 /* No type at all: default to `int', and set DEFAULTED_INT
7650 because it was not a user-defined typedef. */
7651 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7653 /* These imply 'int'. */
7654 type = integer_type_node;
7658 explicit_int = declspecs->explicit_int_p;
7659 explicit_char = declspecs->explicit_char_p;
7662 /* See the code below that used this. */
7664 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7666 typedef_type = type;
7669 if (sfk != sfk_conversion)
7670 ctor_return_type = ctype;
7672 if (sfk != sfk_none)
7673 type = check_special_function_return_type (sfk, type,
7675 else if (type == NULL_TREE)
7681 /* We handle `main' specially here, because 'main () { }' is so
7682 common. With no options, it is allowed. With -Wreturn-type,
7683 it is a warning. It is only an error with -pedantic-errors. */
7684 is_main = (funcdef_flag
7685 && dname && MAIN_NAME_P (dname)
7686 && ctype == NULL_TREE
7687 && in_namespace == NULL_TREE
7688 && current_namespace == global_namespace);
7690 if (type_was_error_mark_node)
7691 /* We've already issued an error, don't complain more. */;
7692 else if (in_system_header || flag_ms_extensions)
7693 /* Allow it, sigh. */;
7694 else if (pedantic || ! is_main)
7695 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7697 warning (OPT_Wreturn_type,
7698 "ISO C++ forbids declaration of %qs with no type", name);
7700 type = integer_type_node;
7705 /* Now process the modifiers that were specified
7706 and check for invalid combinations. */
7708 /* Long double is a special combination. */
7709 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7712 type = build_qualified_type (long_double_type_node,
7713 cp_type_quals (type));
7716 /* Check all other uses of type modifiers. */
7718 if (unsigned_p || signed_p || long_p || short_p)
7722 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7723 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7724 else if (signed_p && unsigned_p)
7725 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7726 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7727 error ("%<long long%> invalid for %qs", name);
7728 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7729 error ("%<long%> invalid for %qs", name);
7730 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7731 error ("%<short%> invalid for %qs", name);
7732 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7733 error ("%<long%> or %<short%> invalid for %qs", name);
7734 else if ((long_p || short_p) && explicit_char)
7735 error ("%<long%> or %<short%> specified with char for %qs", name);
7736 else if (long_p && short_p)
7737 error ("%<long%> and %<short%> specified together for %qs", name);
7741 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7743 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7745 if (flag_pedantic_errors)
7750 /* Discard the type modifiers if they are invalid. */
7761 /* Decide whether an integer type is signed or not.
7762 Optionally treat bitfields as signed by default. */
7766 It is implementation-defined whether a plain (neither
7767 explicitly signed or unsigned) char, short, int, or long
7768 bit-field is signed or unsigned.
7770 Naturally, we extend this to long long as well. Note that
7771 this does not include wchar_t. */
7772 || (bitfield && !flag_signed_bitfields
7774 /* A typedef for plain `int' without `signed' can be
7775 controlled just like plain `int', but a typedef for
7776 `signed int' cannot be so controlled. */
7778 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7779 && TREE_CODE (type) == INTEGER_TYPE
7780 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7783 type = long_long_unsigned_type_node;
7785 type = long_unsigned_type_node;
7787 type = short_unsigned_type_node;
7788 else if (type == char_type_node)
7789 type = unsigned_char_type_node;
7790 else if (typedef_decl)
7791 type = unsigned_type_for (type);
7793 type = unsigned_type_node;
7795 else if (signed_p && type == char_type_node)
7796 type = signed_char_type_node;
7798 type = long_long_integer_type_node;
7800 type = long_integer_type_node;
7802 type = short_integer_type_node;
7804 if (declspecs->specs[(int)ds_complex])
7806 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7807 error ("complex invalid for %qs", name);
7808 /* If we just have "complex", it is equivalent to
7809 "complex double", but if any modifiers at all are specified it is
7810 the complex form of TYPE. E.g, "complex short" is
7811 "complex short int". */
7813 else if (defaulted_int && ! longlong
7814 && ! (long_p || short_p || signed_p || unsigned_p))
7815 type = complex_double_type_node;
7816 else if (type == integer_type_node)
7817 type = complex_integer_type_node;
7818 else if (type == float_type_node)
7819 type = complex_float_type_node;
7820 else if (type == double_type_node)
7821 type = complex_double_type_node;
7822 else if (type == long_double_type_node)
7823 type = complex_long_double_type_node;
7825 type = build_complex_type (type);
7828 type_quals = TYPE_UNQUALIFIED;
7829 if (declspecs->specs[(int)ds_const])
7830 type_quals |= TYPE_QUAL_CONST;
7831 if (declspecs->specs[(int)ds_volatile])
7832 type_quals |= TYPE_QUAL_VOLATILE;
7833 if (declspecs->specs[(int)ds_restrict])
7834 type_quals |= TYPE_QUAL_RESTRICT;
7835 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7836 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7839 if (TREE_CODE (type) == FUNCTION_TYPE
7840 && type_quals != TYPE_UNQUALIFIED)
7842 /* This was an error in C++98 (cv-qualifiers cannot be added to
7843 a function type), but DR 295 makes the code well-formed by
7844 dropping the extra qualifiers. */
7847 tree bad_type = build_qualified_type (type, type_quals);
7848 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7851 type_quals = TYPE_UNQUALIFIED;
7853 type_quals |= cp_type_quals (type);
7854 type = cp_build_qualified_type_real
7855 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7856 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7857 /* We might have ignored or rejected some of the qualifiers. */
7858 type_quals = cp_type_quals (type);
7861 inlinep = !! declspecs->specs[(int)ds_inline];
7862 virtualp = !! declspecs->specs[(int)ds_virtual];
7863 explicitp = !! declspecs->specs[(int)ds_explicit];
7865 storage_class = declspecs->storage_class;
7866 if (storage_class == sc_static)
7867 staticp = 1 + (decl_context == FIELD);
7869 if (virtualp && staticp == 2)
7871 error ("member %qD cannot be declared both virtual and static", dname);
7872 storage_class = sc_none;
7875 friendp = !! declspecs->specs[(int)ds_friend];
7877 if (dependent_name && !friendp)
7879 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7880 return error_mark_node;
7883 /* Issue errors about use of storage classes for parameters. */
7884 if (decl_context == PARM)
7886 if (declspecs->specs[(int)ds_typedef])
7888 error ("typedef declaration invalid in parameter declaration");
7889 return error_mark_node;
7891 else if (storage_class == sc_static
7892 || storage_class == sc_extern
7894 error ("storage class specifiers invalid in parameter declarations");
7897 /* Give error if `virtual' is used outside of class declaration. */
7899 && (current_class_name == NULL_TREE || decl_context != FIELD))
7901 error ("virtual outside class declaration");
7905 /* Static anonymous unions are dealt with here. */
7906 if (staticp && decl_context == TYPENAME
7908 && ANON_AGGR_TYPE_P (declspecs->type))
7909 decl_context = FIELD;
7911 /* Warn about storage classes that are invalid for certain
7912 kinds of declarations (parameters, typenames, etc.). */
7915 && storage_class != sc_extern
7916 && storage_class != sc_static)
7917 || declspecs->specs[(int)ds_typedef]))
7919 error ("multiple storage classes in declaration of %qs", name);
7922 if (decl_context != NORMAL
7923 && ((storage_class != sc_none
7924 && storage_class != sc_mutable)
7927 if ((decl_context == PARM || decl_context == CATCHPARM)
7928 && (storage_class == sc_register
7929 || storage_class == sc_auto))
7931 else if (declspecs->specs[(int)ds_typedef])
7933 else if (decl_context == FIELD
7934 /* C++ allows static class elements. */
7935 && storage_class == sc_static)
7936 /* C++ also allows inlines and signed and unsigned elements,
7937 but in those cases we don't come in here. */
7941 if (decl_context == FIELD)
7942 error ("storage class specified for %qs", name);
7945 if (decl_context == PARM || decl_context == CATCHPARM)
7946 error ("storage class specified for parameter %qs", name);
7948 error ("storage class specified for typename");
7950 if (storage_class == sc_register
7951 || storage_class == sc_auto
7952 || storage_class == sc_extern
7954 storage_class = sc_none;
7957 else if (storage_class == sc_extern && initialized
7960 if (toplevel_bindings_p ())
7962 /* It's common practice (and completely valid) to have a const
7963 be initialized and declared extern. */
7964 if (!(type_quals & TYPE_QUAL_CONST))
7965 warning (0, "%qs initialized and declared %<extern%>", name);
7968 error ("%qs has both %<extern%> and initializer", name);
7970 else if (storage_class == sc_extern && funcdef_flag
7971 && ! toplevel_bindings_p ())
7972 error ("nested function %qs declared %<extern%>", name);
7973 else if (toplevel_bindings_p ())
7975 if (storage_class == sc_auto)
7976 error ("top-level declaration of %qs specifies %<auto%>", name);
7979 && storage_class != sc_extern
7980 && storage_class != sc_static)
7982 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7987 if (storage_class && friendp)
7988 error ("storage class specifiers invalid in friend function declarations");
7991 unqualified_id = NULL_TREE;
7994 unqualified_id = id_declarator->u.id.unqualified_name;
7995 switch (TREE_CODE (unqualified_id))
7999 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8002 case IDENTIFIER_NODE:
8003 case TEMPLATE_ID_EXPR:
8011 /* Determine the type of the entity declared by recurring on the
8013 for (; declarator; declarator = declarator->declarator)
8015 const cp_declarator *inner_declarator;
8018 if (type == error_mark_node)
8019 return error_mark_node;
8021 attrs = declarator->attributes;
8027 if (declarator == NULL || declarator->kind == cdk_id)
8028 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8029 if (declarator->kind == cdk_function)
8030 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8031 if (declarator->kind == cdk_array)
8032 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8033 returned_attrs = decl_attributes (&type,
8034 chainon (returned_attrs, attrs),
8038 if (declarator->kind == cdk_id)
8041 inner_declarator = declarator->declarator;
8043 switch (declarator->kind)
8046 type = create_array_type_for_decl (dname, type,
8047 declarator->u.array.bounds);
8055 /* Declaring a function type.
8056 Make sure we have a valid type for the function to return. */
8058 if (type_quals != TYPE_UNQUALIFIED)
8060 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8061 warning (OPT_Wignored_qualifiers,
8062 "type qualifiers ignored on function return type");
8063 /* We now know that the TYPE_QUALS don't apply to the
8064 decl, but to its return type. */
8065 type_quals = TYPE_UNQUALIFIED;
8066 set_no_warning = true;
8069 /* Warn about some types functions can't return. */
8071 if (TREE_CODE (type) == FUNCTION_TYPE)
8073 error ("%qs declared as function returning a function", name);
8074 type = integer_type_node;
8076 if (TREE_CODE (type) == ARRAY_TYPE)
8078 error ("%qs declared as function returning an array", name);
8079 type = integer_type_node;
8082 /* Pick up type qualifiers which should be applied to `this'. */
8083 memfn_quals = declarator->u.function.qualifiers;
8085 /* Pick up the exception specifications. */
8086 raises = declarator->u.function.exception_specification;
8088 /* Say it's a definition only for the CALL_EXPR
8089 closest to the identifier. */
8090 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8092 if (ctype == NULL_TREE
8093 && decl_context == FIELD
8095 && (friendp == 0 || dname == current_class_name))
8096 ctype = current_class_type;
8098 if (ctype && (sfk == sfk_constructor
8099 || sfk == sfk_destructor))
8101 /* We are within a class's scope. If our declarator name
8102 is the same as the class name, and we are defining
8103 a function, then it is a constructor/destructor, and
8104 therefore returns a void type. */
8106 /* ISO C++ 12.4/2. A destructor may not be declared
8107 const or volatile. A destructor may not be
8110 ISO C++ 12.1. A constructor may not be declared
8111 const or volatile. A constructor may not be
8112 virtual. A constructor may not be static. */
8114 error ((flags == DTOR_FLAG)
8115 ? "destructor cannot be static member function"
8116 : "constructor cannot be static member function");
8119 error ((flags == DTOR_FLAG)
8120 ? "destructors may not be cv-qualified"
8121 : "constructors may not be cv-qualified");
8122 memfn_quals = TYPE_UNQUALIFIED;
8125 if (decl_context == FIELD
8126 && !member_function_or_else (ctype,
8129 return error_mark_node;
8131 if (flags != DTOR_FLAG)
8133 /* It's a constructor. */
8138 pedwarn ("constructors cannot be declared virtual");
8141 if (decl_context == FIELD
8142 && sfk != sfk_constructor)
8143 return error_mark_node;
8145 if (decl_context == FIELD)
8151 error ("can't initialize friend function %qs", name);
8154 /* Cannot be both friend and virtual. */
8155 error ("virtual functions cannot be friends");
8158 if (decl_context == NORMAL)
8159 error ("friend declaration not in class definition");
8160 if (current_function_decl && funcdef_flag)
8161 error ("can't define friend function %qs in a local "
8166 arg_types = grokparms (declarator->u.function.parameters,
8169 if (inner_declarator
8170 && inner_declarator->kind == cdk_id
8171 && inner_declarator->u.id.sfk == sfk_destructor
8172 && arg_types != void_list_node)
8174 error ("destructors may not have parameters");
8175 arg_types = void_list_node;
8179 type = build_function_type (type, arg_types);
8186 /* Filter out pointers-to-references and references-to-references.
8187 We can get these if a TYPE_DECL is used. */
8189 if (TREE_CODE (type) == REFERENCE_TYPE)
8191 if (declarator->kind != cdk_reference)
8193 error ("cannot declare pointer to %q#T", type);
8194 type = TREE_TYPE (type);
8197 /* In C++0x, we allow reference to reference declarations
8198 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8199 and template type arguments [14.3.1/4 temp.arg.type]. The
8200 check for direct reference to reference declarations, which
8201 are still forbidden, occurs below. Reasoning behind the change
8202 can be found in DR106, DR540, and the rvalue reference
8204 else if (cxx_dialect == cxx98)
8206 error ("cannot declare reference to %q#T", type);
8207 type = TREE_TYPE (type);
8210 else if (VOID_TYPE_P (type))
8212 if (declarator->kind == cdk_reference)
8213 error ("cannot declare reference to %q#T", type);
8214 else if (declarator->kind == cdk_ptrmem)
8215 error ("cannot declare pointer to %q#T member", type);
8218 /* We now know that the TYPE_QUALS don't apply to the decl,
8219 but to the target of the pointer. */
8220 type_quals = TYPE_UNQUALIFIED;
8222 if (declarator->kind == cdk_ptrmem
8223 && (TREE_CODE (type) == FUNCTION_TYPE
8224 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8226 memfn_quals |= cp_type_quals (type);
8227 type = build_memfn_type (type,
8228 declarator->u.pointer.class_type,
8230 memfn_quals = TYPE_UNQUALIFIED;
8233 if (declarator->kind == cdk_reference)
8235 /* In C++0x, the type we are creating a reference to might be
8236 a typedef which is itself a reference type. In that case,
8237 we follow the reference collapsing rules in
8238 [7.1.3/8 dcl.typedef] to create the final reference type:
8240 "If a typedef TD names a type that is a reference to a type
8241 T, an attempt to create the type 'lvalue reference to cv TD'
8242 creates the type 'lvalue reference to T,' while an attempt
8243 to create the type "rvalue reference to cv TD' creates the
8246 if (!VOID_TYPE_P (type))
8247 type = cp_build_reference_type
8248 ((TREE_CODE (type) == REFERENCE_TYPE
8249 ? TREE_TYPE (type) : type),
8250 (declarator->u.reference.rvalue_ref
8251 && (TREE_CODE(type) != REFERENCE_TYPE
8252 || TYPE_REF_IS_RVALUE (type))));
8254 /* In C++0x, we need this check for direct reference to
8255 reference declarations, which are forbidden by
8256 [8.3.2/5 dcl.ref]. Reference to reference declarations
8257 are only allowed indirectly through typedefs and template
8258 type arguments. Example:
8260 void foo(int & &); // invalid ref-to-ref decl
8262 typedef int & int_ref;
8263 void foo(int_ref &); // valid ref-to-ref decl
8265 if (inner_declarator && inner_declarator->kind == cdk_reference)
8266 error ("cannot declare reference to %q#T, which is not "
8267 "a typedef or a template type argument", type);
8269 else if (TREE_CODE (type) == METHOD_TYPE)
8270 type = build_ptrmemfunc_type (build_pointer_type (type));
8271 else if (declarator->kind == cdk_ptrmem)
8273 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8275 if (declarator->u.pointer.class_type == error_mark_node)
8276 /* We will already have complained. */
8277 type = error_mark_node;
8279 type = build_ptrmem_type (declarator->u.pointer.class_type,
8283 type = build_pointer_type (type);
8285 /* Process a list of type modifier keywords (such as
8286 const or volatile) that were given inside the `*' or `&'. */
8288 if (declarator->u.pointer.qualifiers)
8291 = cp_build_qualified_type (type,
8292 declarator->u.pointer.qualifiers);
8293 type_quals = cp_type_quals (type);
8306 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8307 && TREE_CODE (type) != FUNCTION_TYPE
8308 && TREE_CODE (type) != METHOD_TYPE)
8310 error ("template-id %qD used as a declarator",
8312 unqualified_id = dname;
8315 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8316 qualified with a class-name, turn it into a METHOD_TYPE, unless
8317 we know that the function is static. We take advantage of this
8318 opportunity to do other processing that pertains to entities
8319 explicitly declared to be class members. Note that if DECLARATOR
8320 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8321 would not have exited the loop above. */
8323 && declarator->u.id.qualifying_scope
8324 && TYPE_P (declarator->u.id.qualifying_scope))
8328 ctype = declarator->u.id.qualifying_scope;
8329 ctype = TYPE_MAIN_VARIANT (ctype);
8331 while (t != NULL_TREE && CLASS_TYPE_P (t))
8333 /* You're supposed to have one `template <...>' for every
8334 template class, but you don't need one for a full
8335 specialization. For example:
8337 template <class T> struct S{};
8338 template <> struct S<int> { void f(); };
8339 void S<int>::f () {}
8341 is correct; there shouldn't be a `template <>' for the
8342 definition of `S<int>::f'. */
8343 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8344 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8345 /* T is an explicit (not partial) specialization. All
8346 containing classes must therefore also be explicitly
8349 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8350 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8351 template_count += 1;
8353 t = TYPE_MAIN_DECL (t);
8354 t = DECL_CONTEXT (t);
8357 if (ctype == current_class_type)
8361 pedwarn ("member functions are implicitly friends of their class");
8365 pedwarn ("extra qualification %<%T::%> on member %qs",
8368 else if (/* If the qualifying type is already complete, then we
8369 can skip the following checks. */
8370 !COMPLETE_TYPE_P (ctype)
8371 && (/* If the function is being defined, then
8372 qualifying type must certainly be complete. */
8374 /* A friend declaration of "T::f" is OK, even if
8375 "T" is a template parameter. But, if this
8376 function is not a friend, the qualifying type
8378 || (!friendp && !CLASS_TYPE_P (ctype))
8379 /* For a declaration, the type need not be
8380 complete, if either it is dependent (since there
8381 is no meaningful definition of complete in that
8382 case) or the qualifying class is currently being
8384 || !(dependent_type_p (ctype)
8385 || currently_open_class (ctype)))
8386 /* Check that the qualifying type is complete. */
8387 && !complete_type_or_else (ctype, NULL_TREE))
8388 return error_mark_node;
8389 else if (TREE_CODE (type) == FUNCTION_TYPE)
8391 tree sname = declarator->u.id.unqualified_name;
8393 if (current_class_type
8394 && (!friendp || funcdef_flag))
8397 ? "cannot define member function %<%T::%s%> within %<%T%>"
8398 : "cannot declare member function %<%T::%s%> within %<%T%>",
8399 ctype, name, current_class_type);
8400 return error_mark_node;
8403 if (TREE_CODE (sname) == IDENTIFIER_NODE
8404 && NEW_DELETE_OPNAME_P (sname))
8405 /* Overloaded operator new and operator delete
8406 are always static functions. */
8409 type = build_memfn_type (type, ctype, memfn_quals);
8411 else if (declspecs->specs[(int)ds_typedef]
8412 && current_class_type)
8414 error ("cannot declare member %<%T::%s%> within %qT",
8415 ctype, name, current_class_type);
8416 return error_mark_node;
8420 /* Now TYPE has the actual type. */
8425 *attrlist = chainon (returned_attrs, *attrlist);
8427 attrlist = &returned_attrs;
8430 /* Handle parameter packs. */
8431 if (parameter_pack_p)
8433 if (decl_context == PARM)
8434 /* Turn the type into a pack expansion.*/
8435 type = make_pack_expansion (type);
8437 error ("non-parameter %qs cannot be a parameter pack", name);
8440 /* Did array size calculations overflow? */
8442 if (TREE_CODE (type) == ARRAY_TYPE
8443 && COMPLETE_TYPE_P (type)
8444 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8445 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8447 error ("size of array %qs is too large", name);
8448 /* If we proceed with the array type as it is, we'll eventually
8449 crash in tree_low_cst(). */
8450 type = error_mark_node;
8453 if ((decl_context == FIELD || decl_context == PARM)
8454 && !processing_template_decl
8455 && variably_modified_type_p (type, NULL_TREE))
8457 if (decl_context == FIELD)
8458 error ("data member may not have variably modified type %qT", type);
8460 error ("parameter may not have variably modified type %qT", type);
8461 type = error_mark_node;
8464 if (explicitp == 1 || (explicitp && friendp))
8466 /* [dcl.fct.spec] The explicit specifier shall only be used in
8467 declarations of constructors within a class definition. */
8468 error ("only declarations of constructors can be %<explicit%>");
8472 if (storage_class == sc_mutable)
8474 if (decl_context != FIELD || friendp)
8476 error ("non-member %qs cannot be declared %<mutable%>", name);
8477 storage_class = sc_none;
8479 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8481 error ("non-object member %qs cannot be declared %<mutable%>", name);
8482 storage_class = sc_none;
8484 else if (TREE_CODE (type) == FUNCTION_TYPE
8485 || TREE_CODE (type) == METHOD_TYPE)
8487 error ("function %qs cannot be declared %<mutable%>", name);
8488 storage_class = sc_none;
8492 error ("static %qs cannot be declared %<mutable%>", name);
8493 storage_class = sc_none;
8495 else if (type_quals & TYPE_QUAL_CONST)
8497 error ("const %qs cannot be declared %<mutable%>", name);
8498 storage_class = sc_none;
8502 /* If this is declaring a typedef name, return a TYPE_DECL. */
8503 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8507 /* Note that the grammar rejects storage classes
8508 in typenames, fields or parameters. */
8509 if (current_lang_name == lang_name_java)
8510 TYPE_FOR_JAVA (type) = 1;
8512 /* This declaration:
8514 typedef void f(int) const;
8516 declares a function type which is not a member of any
8517 particular class, but which is cv-qualified; for
8518 example "f S::*" declares a pointer to a const-qualified
8519 member function of S. We record the cv-qualification in the
8521 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8523 type = cp_build_qualified_type (type, memfn_quals);
8525 /* We have now dealt with these qualifiers. */
8526 memfn_quals = TYPE_UNQUALIFIED;
8529 if (decl_context == FIELD)
8530 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8532 decl = build_decl (TYPE_DECL, unqualified_id, type);
8533 if (id_declarator && declarator->u.id.qualifying_scope)
8534 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8536 if (decl_context != FIELD)
8538 if (!current_function_decl)
8539 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8540 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8541 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8542 (current_function_decl)))
8543 /* The TYPE_DECL is "abstract" because there will be
8544 clones of this constructor/destructor, and there will
8545 be copies of this TYPE_DECL generated in those
8547 DECL_ABSTRACT (decl) = 1;
8549 else if (constructor_name_p (unqualified_id, current_class_type))
8550 pedwarn ("ISO C++ forbids nested type %qD with same name "
8551 "as enclosing class",
8554 /* If the user declares "typedef struct {...} foo" then the
8555 struct will have an anonymous name. Fill that name in now.
8556 Nothing can refer to it, so nothing needs know about the name
8558 if (type != error_mark_node
8561 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8562 && TYPE_ANONYMOUS_P (type)
8563 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8565 tree oldname = TYPE_NAME (type);
8568 /* Replace the anonymous name with the real name everywhere. */
8569 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8570 if (TYPE_NAME (t) == oldname)
8571 TYPE_NAME (t) = decl;
8573 if (TYPE_LANG_SPECIFIC (type))
8574 TYPE_WAS_ANONYMOUS (type) = 1;
8576 /* If this is a typedef within a template class, the nested
8577 type is a (non-primary) template. The name for the
8578 template needs updating as well. */
8579 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8580 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8581 = TYPE_IDENTIFIER (type);
8583 /* FIXME remangle member functions; member functions of a
8584 type with external linkage have external linkage. */
8588 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8589 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8591 bad_specifiers (decl, "type", virtualp,
8592 memfn_quals != TYPE_UNQUALIFIED,
8593 inlinep, friendp, raises != NULL_TREE);
8598 /* Detect the case of an array type of unspecified size
8599 which came, as such, direct from a typedef name.
8600 We must copy the type, so that the array's domain can be
8601 individually set by the object's initializer. */
8603 if (type && typedef_type
8604 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8605 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8606 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8608 /* Detect where we're using a typedef of function type to declare a
8609 function. PARMS will not be set, so we must create it now. */
8611 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8613 tree decls = NULL_TREE;
8616 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8618 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8620 TREE_CHAIN (decl) = decls;
8624 parms = nreverse (decls);
8626 if (decl_context != TYPENAME)
8628 /* A cv-qualifier-seq shall only be part of the function type
8629 for a non-static member function. [8.3.5/4 dcl.fct] */
8630 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8631 && (current_class_type == NULL_TREE || staticp) )
8634 ? G_("qualified function types cannot be used to "
8635 "declare static member functions")
8636 : G_("qualified function types cannot be used to "
8637 "declare free functions"));
8638 type = TYPE_MAIN_VARIANT (type);
8641 /* The qualifiers on the function type become the qualifiers on
8642 the non-static member function. */
8643 memfn_quals |= cp_type_quals (type);
8647 /* If this is a type name (such as, in a cast or sizeof),
8648 compute the type and return it now. */
8650 if (decl_context == TYPENAME)
8652 /* Note that the grammar rejects storage classes
8653 in typenames, fields or parameters. */
8654 if (type_quals != TYPE_UNQUALIFIED)
8655 type_quals = TYPE_UNQUALIFIED;
8657 /* Special case: "friend class foo" looks like a TYPENAME context. */
8660 if (type_quals != TYPE_UNQUALIFIED)
8662 error ("type qualifiers specified for friend class declaration");
8663 type_quals = TYPE_UNQUALIFIED;
8667 error ("%<inline%> specified for friend class declaration");
8673 /* Don't allow friend declaration without a class-key. */
8674 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8675 pedwarn ("template parameters cannot be friends");
8676 else if (TREE_CODE (type) == TYPENAME_TYPE)
8677 pedwarn ("friend declaration requires class-key, "
8678 "i.e. %<friend class %T::%D%>",
8679 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8681 pedwarn ("friend declaration requires class-key, "
8682 "i.e. %<friend %#T%>",
8686 /* Only try to do this stuff if we didn't already give up. */
8687 if (type != integer_type_node)
8689 /* A friendly class? */
8690 if (current_class_type)
8691 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8694 error ("trying to make class %qT a friend of global scope",
8697 type = void_type_node;
8700 else if (memfn_quals)
8702 if (ctype == NULL_TREE)
8704 if (TREE_CODE (type) != METHOD_TYPE)
8705 error ("invalid qualifiers on non-member function type");
8707 ctype = TYPE_METHOD_BASETYPE (type);
8710 type = build_memfn_type (type, ctype, memfn_quals);
8715 else if (unqualified_id == NULL_TREE && decl_context != PARM
8716 && decl_context != CATCHPARM
8717 && TREE_CODE (type) != UNION_TYPE
8720 error ("abstract declarator %qT used as declaration", type);
8721 return error_mark_node;
8724 /* Only functions may be declared using an operator-function-id. */
8726 && IDENTIFIER_OPNAME_P (unqualified_id)
8727 && TREE_CODE (type) != FUNCTION_TYPE
8728 && TREE_CODE (type) != METHOD_TYPE)
8730 error ("declaration of %qD as non-function", unqualified_id);
8731 return error_mark_node;
8734 /* We don't check parameter types here because we can emit a better
8735 error message later. */
8736 if (decl_context != PARM)
8738 type = check_var_type (unqualified_id, type);
8739 if (type == error_mark_node)
8740 return error_mark_node;
8743 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8744 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8746 if (decl_context == PARM || decl_context == CATCHPARM)
8748 if (ctype || in_namespace)
8749 error ("cannot use %<::%> in parameter declaration");
8751 /* A parameter declared as an array of T is really a pointer to T.
8752 One declared as a function is really a pointer to a function.
8753 One declared as a member is really a pointer to member. */
8755 if (TREE_CODE (type) == ARRAY_TYPE)
8757 /* Transfer const-ness of array into that of type pointed to. */
8758 type = build_pointer_type (TREE_TYPE (type));
8759 type_quals = TYPE_UNQUALIFIED;
8761 else if (TREE_CODE (type) == FUNCTION_TYPE)
8762 type = build_pointer_type (type);
8768 if (decl_context == PARM)
8770 decl = cp_build_parm_decl (unqualified_id, type);
8772 bad_specifiers (decl, "parameter", virtualp,
8773 memfn_quals != TYPE_UNQUALIFIED,
8774 inlinep, friendp, raises != NULL_TREE);
8776 else if (decl_context == FIELD)
8778 /* The C99 flexible array extension. */
8779 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8780 && TYPE_DOMAIN (type) == NULL_TREE)
8782 tree itype = compute_array_index_type (dname, integer_zero_node);
8783 type = build_cplus_array_type (TREE_TYPE (type), itype);
8786 if (type == error_mark_node)
8788 /* Happens when declaring arrays of sizes which
8789 are error_mark_node, for example. */
8792 else if (in_namespace && !friendp)
8794 /* Something like struct S { int N::j; }; */
8795 error ("invalid use of %<::%>");
8796 return error_mark_node;
8798 else if (TREE_CODE (type) == FUNCTION_TYPE)
8801 tree function_context;
8805 if (ctype == NULL_TREE)
8806 ctype = current_class_type;
8808 if (ctype == NULL_TREE)
8810 error ("can't make %qD into a method -- not in a class",
8812 return error_mark_node;
8815 /* ``A union may [ ... ] not [ have ] virtual functions.''
8817 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8819 error ("function %qD declared virtual inside a union",
8821 return error_mark_node;
8824 if (NEW_DELETE_OPNAME_P (unqualified_id))
8828 error ("%qD cannot be declared virtual, since it "
8834 else if (staticp < 2)
8835 type = build_memfn_type (type, ctype, memfn_quals);
8838 /* Check that the name used for a destructor makes sense. */
8839 if (sfk == sfk_destructor)
8843 gcc_assert (friendp);
8844 error ("expected qualified name in friend declaration "
8845 "for destructor %qD",
8846 id_declarator->u.id.unqualified_name);
8847 return error_mark_node;
8850 if (!same_type_p (TREE_OPERAND
8851 (id_declarator->u.id.unqualified_name, 0),
8854 error ("declaration of %qD as member of %qT",
8855 id_declarator->u.id.unqualified_name, ctype);
8856 return error_mark_node;
8859 else if (sfk == sfk_constructor && friendp)
8861 error ("expected qualified name in friend declaration "
8862 "for constructor %qD",
8863 id_declarator->u.id.unqualified_name);
8864 return error_mark_node;
8867 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8868 function_context = (ctype != NULL_TREE) ?
8869 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8870 publicp = (! friendp || ! staticp)
8871 && function_context == NULL_TREE;
8872 decl = grokfndecl (ctype, type,
8873 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8874 ? unqualified_id : dname,
8877 virtualp, flags, memfn_quals, raises,
8878 friendp ? -1 : 0, friendp, publicp, inlinep,
8880 funcdef_flag, template_count, in_namespace, attrlist);
8881 if (decl == NULL_TREE)
8882 return error_mark_node;
8884 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8885 /* The decl and setting of decl_attr is also turned off. */
8886 decl = build_decl_attribute_variant (decl, decl_attr);
8889 /* [class.conv.ctor]
8891 A constructor declared without the function-specifier
8892 explicit that can be called with a single parameter
8893 specifies a conversion from the type of its first
8894 parameter to the type of its class. Such a constructor
8895 is called a converting constructor. */
8897 DECL_NONCONVERTING_P (decl) = 1;
8898 else if (DECL_CONSTRUCTOR_P (decl))
8900 /* The constructor can be called with exactly one
8901 parameter if there is at least one parameter, and
8902 any subsequent parameters have default arguments.
8903 Ignore any compiler-added parms. */
8904 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8906 if (arg_types == void_list_node
8908 && TREE_CHAIN (arg_types)
8909 && TREE_CHAIN (arg_types) != void_list_node
8910 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8911 DECL_NONCONVERTING_P (decl) = 1;
8914 else if (TREE_CODE (type) == METHOD_TYPE)
8916 /* We only get here for friend declarations of
8917 members of other classes. */
8918 /* All method decls are public, so tell grokfndecl to set
8919 TREE_PUBLIC, also. */
8920 decl = grokfndecl (ctype, type,
8921 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8922 ? unqualified_id : dname,
8925 virtualp, flags, memfn_quals, raises,
8926 friendp ? -1 : 0, friendp, 1, 0, sfk,
8927 funcdef_flag, template_count, in_namespace,
8929 if (decl == NULL_TREE)
8930 return error_mark_node;
8932 else if (!staticp && !dependent_type_p (type)
8933 && !COMPLETE_TYPE_P (complete_type (type))
8934 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8937 error ("field %qD has incomplete type", unqualified_id);
8939 error ("name %qT has incomplete type", type);
8941 /* If we're instantiating a template, tell them which
8942 instantiation made the field's type be incomplete. */
8943 if (current_class_type
8944 && TYPE_NAME (current_class_type)
8945 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8947 && declspecs->type == type)
8948 error (" in instantiation of template %qT",
8949 current_class_type);
8951 return error_mark_node;
8957 error ("%qE is neither function nor member function; "
8958 "cannot be declared friend", unqualified_id);
8966 /* Friends are treated specially. */
8967 if (ctype == current_class_type)
8968 ; /* We already issued a pedwarn. */
8969 else if (decl && DECL_NAME (decl))
8971 if (template_class_depth (current_class_type) == 0)
8973 decl = check_explicit_specialization
8974 (unqualified_id, decl, template_count,
8975 2 * funcdef_flag + 4);
8976 if (decl == error_mark_node)
8977 return error_mark_node;
8980 decl = do_friend (ctype, unqualified_id, decl,
8986 return error_mark_node;
8989 /* Structure field. It may not be a function, except for C++. */
8991 if (decl == NULL_TREE)
8997 /* An attempt is being made to initialize a non-static
8998 member. But, from [class.mem]:
9000 4 A member-declarator can contain a
9001 constant-initializer only if it declares a static
9002 member (_class.static_) of integral or enumeration
9003 type, see _class.static.data_.
9005 This used to be relatively common practice, but
9006 the rest of the compiler does not correctly
9007 handle the initialization unless the member is
9008 static so we make it static below. */
9009 pedwarn ("ISO C++ forbids initialization of member %qD",
9011 pedwarn ("making %qD static", unqualified_id);
9015 if (uses_template_parms (type))
9016 /* We'll check at instantiation time. */
9018 else if (check_static_variable_definition (unqualified_id,
9020 /* If we just return the declaration, crashes
9021 will sometimes occur. We therefore return
9022 void_type_node, as if this was a friend
9023 declaration, to cause callers to completely
9024 ignore this declaration. */
9025 return error_mark_node;
9030 /* C++ allows static class members. All other work
9031 for this is done by grokfield. */
9032 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9033 set_linkage_for_static_data_member (decl);
9034 /* Even if there is an in-class initialization, DECL
9035 is considered undefined until an out-of-class
9036 definition is provided. */
9037 DECL_EXTERNAL (decl) = 1;
9040 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9044 decl = build_decl (FIELD_DECL, unqualified_id, type);
9045 DECL_NONADDRESSABLE_P (decl) = bitfield;
9046 if (bitfield && !unqualified_id)
9047 TREE_NO_WARNING (decl) = 1;
9049 if (storage_class == sc_mutable)
9051 DECL_MUTABLE_P (decl) = 1;
9052 storage_class = sc_none;
9056 bad_specifiers (decl, "field", virtualp,
9057 memfn_quals != TYPE_UNQUALIFIED,
9058 inlinep, friendp, raises != NULL_TREE);
9061 else if (TREE_CODE (type) == FUNCTION_TYPE
9062 || TREE_CODE (type) == METHOD_TYPE)
9067 if (!unqualified_id)
9068 return error_mark_node;
9070 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9071 original_name = dname;
9073 original_name = unqualified_id;
9075 if (storage_class == sc_auto)
9076 error ("storage class %<auto%> invalid for function %qs", name);
9077 else if (storage_class == sc_register)
9078 error ("storage class %<register%> invalid for function %qs", name);
9080 error ("storage class %<__thread%> invalid for function %qs", name);
9082 /* Function declaration not at top level.
9083 Storage classes other than `extern' are not allowed
9084 and `extern' makes no difference. */
9085 if (! toplevel_bindings_p ()
9086 && (storage_class == sc_static
9087 || declspecs->specs[(int)ds_inline])
9090 if (storage_class == sc_static)
9091 pedwarn ("%<static%> specified invalid for function %qs "
9092 "declared out of global scope", name);
9094 pedwarn ("%<inline%> specifier invalid for function %qs "
9095 "declared out of global scope", name);
9098 if (ctype == NULL_TREE)
9102 error ("virtual non-class function %qs", name);
9106 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9107 && !NEW_DELETE_OPNAME_P (original_name))
9108 type = build_method_type_directly (ctype,
9110 TYPE_ARG_TYPES (type));
9112 /* Record presence of `static'. */
9113 publicp = (ctype != NULL_TREE
9114 || storage_class == sc_extern
9115 || storage_class != sc_static);
9117 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9118 virtualp, flags, memfn_quals, raises,
9120 publicp, inlinep, sfk, funcdef_flag,
9121 template_count, in_namespace, attrlist);
9122 if (decl == NULL_TREE)
9123 return error_mark_node;
9127 int invalid_static = 0;
9129 /* Don't allow a static member function in a class, and forbid
9130 declaring main to be static. */
9131 if (TREE_CODE (type) == METHOD_TYPE)
9133 pedwarn ("cannot declare member function %qD to have "
9134 "static linkage", decl);
9137 else if (current_function_decl)
9139 /* FIXME need arm citation */
9140 error ("cannot declare static function inside another function");
9147 storage_class = sc_none;
9153 /* It's a variable. */
9155 /* An uninitialized decl with `extern' is a reference. */
9156 decl = grokvardecl (type, unqualified_id,
9159 (type_quals & TYPE_QUAL_CONST) != 0,
9160 ctype ? ctype : in_namespace);
9161 bad_specifiers (decl, "variable", virtualp,
9162 memfn_quals != TYPE_UNQUALIFIED,
9163 inlinep, friendp, raises != NULL_TREE);
9167 DECL_CONTEXT (decl) = ctype;
9170 pedwarn ("%<static%> may not be used when defining "
9171 "(as opposed to declaring) a static data member");
9173 storage_class = sc_none;
9175 if (storage_class == sc_register && TREE_STATIC (decl))
9177 error ("static member %qD declared %<register%>", decl);
9178 storage_class = sc_none;
9180 if (storage_class == sc_extern && pedantic)
9182 pedwarn ("cannot explicitly declare member %q#D to have "
9185 storage_class = sc_none;
9190 /* Record `register' declaration for warnings on &
9191 and in case doing stupid register allocation. */
9193 if (storage_class == sc_register)
9194 DECL_REGISTER (decl) = 1;
9195 else if (storage_class == sc_extern)
9196 DECL_THIS_EXTERN (decl) = 1;
9197 else if (storage_class == sc_static)
9198 DECL_THIS_STATIC (decl) = 1;
9200 /* Record constancy and volatility on the DECL itself . There's
9201 no need to do this when processing a template; we'll do this
9202 for the instantiated declaration based on the type of DECL. */
9203 if (!processing_template_decl)
9204 cp_apply_type_quals_to_decl (type_quals, decl);
9207 TREE_NO_WARNING (decl) = 1;
9213 /* Subroutine of start_function. Ensure that each of the parameter
9214 types (as listed in PARMS) is complete, as is required for a
9215 function definition. */
9218 require_complete_types_for_parms (tree parms)
9220 for (; parms; parms = TREE_CHAIN (parms))
9222 if (dependent_type_p (TREE_TYPE (parms)))
9224 if (!VOID_TYPE_P (TREE_TYPE (parms))
9225 && complete_type_or_else (TREE_TYPE (parms), parms))
9227 relayout_decl (parms);
9228 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9231 /* grokparms or complete_type_or_else will have already issued
9233 TREE_TYPE (parms) = error_mark_node;
9237 /* Returns nonzero if T is a local variable. */
9240 local_variable_p (const_tree t)
9242 if ((TREE_CODE (t) == VAR_DECL
9243 /* A VAR_DECL with a context that is a _TYPE is a static data
9245 && !TYPE_P (CP_DECL_CONTEXT (t))
9246 /* Any other non-local variable must be at namespace scope. */
9247 && !DECL_NAMESPACE_SCOPE_P (t))
9248 || (TREE_CODE (t) == PARM_DECL))
9254 /* Like local_variable_p, but suitable for use as a tree-walking
9258 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9259 void *data ATTRIBUTE_UNUSED)
9261 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9263 else if (TYPE_P (*tp))
9270 /* Check that ARG, which is a default-argument expression for a
9271 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9272 something goes wrong. DECL may also be a _TYPE node, rather than a
9273 DECL, if there is no DECL available. */
9276 check_default_argument (tree decl, tree arg)
9281 if (TREE_CODE (arg) == DEFAULT_ARG)
9282 /* We get a DEFAULT_ARG when looking at an in-class declaration
9283 with a default argument. Ignore the argument for now; we'll
9284 deal with it after the class is complete. */
9293 decl_type = TREE_TYPE (decl);
9295 if (arg == error_mark_node
9296 || decl == error_mark_node
9297 || TREE_TYPE (arg) == error_mark_node
9298 || decl_type == error_mark_node)
9299 /* Something already went wrong. There's no need to check
9301 return error_mark_node;
9303 /* [dcl.fct.default]
9305 A default argument expression is implicitly converted to the
9307 if (!TREE_TYPE (arg)
9308 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9311 error ("default argument for %q#D has type %qT",
9312 decl, TREE_TYPE (arg));
9314 error ("default argument for parameter of type %qT has type %qT",
9315 decl_type, TREE_TYPE (arg));
9317 return error_mark_node;
9320 /* [dcl.fct.default]
9322 Local variables shall not be used in default argument
9325 The keyword `this' shall not be used in a default argument of a
9327 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9330 error ("default argument %qE uses local variable %qD", arg, var);
9331 return error_mark_node;
9338 /* Decode the list of parameter types for a function type.
9339 Given the list of things declared inside the parens,
9340 return a list of types.
9342 If this parameter does not end with an ellipsis, we append
9345 *PARMS is set to the chain of PARM_DECLs created. */
9348 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9350 tree result = NULL_TREE;
9351 tree decls = NULL_TREE;
9352 int ellipsis = !first_parm || first_parm->ellipsis_p;
9353 cp_parameter_declarator *parm;
9355 struct pointer_set_t *unique_decls = pointer_set_create ();
9357 for (parm = first_parm; parm != NULL; parm = parm->next)
9359 tree type = NULL_TREE;
9360 tree init = parm->default_argument;
9364 if (parm == no_parameters)
9367 attrs = parm->decl_specifiers.attributes;
9368 parm->decl_specifiers.attributes = NULL_TREE;
9369 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9370 PARM, init != NULL_TREE, &attrs);
9371 if (! decl || TREE_TYPE (decl) == error_mark_node)
9375 cplus_decl_attributes (&decl, attrs, 0);
9377 type = TREE_TYPE (decl);
9378 if (VOID_TYPE_P (type))
9380 if (same_type_p (type, void_type_node)
9381 && DECL_SELF_REFERENCE_P (type)
9382 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9383 /* this is a parmlist of `(void)', which is ok. */
9385 cxx_incomplete_type_error (decl, type);
9386 /* It's not a good idea to actually create parameters of
9387 type `void'; other parts of the compiler assume that a
9388 void type terminates the parameter list. */
9389 type = error_mark_node;
9390 TREE_TYPE (decl) = error_mark_node;
9393 if (type != error_mark_node
9394 && TYPE_FOR_JAVA (type)
9395 && IS_AGGR_TYPE (type))
9397 error ("parameter %qD has Java class type", decl);
9398 type = error_mark_node;
9399 TREE_TYPE (decl) = error_mark_node;
9403 if (type != error_mark_node)
9405 /* Top-level qualifiers on the parameters are
9406 ignored for function types. */
9407 type = cp_build_qualified_type (type, 0);
9408 if (TREE_CODE (type) == METHOD_TYPE)
9410 error ("parameter %qD invalidly declared method type", decl);
9411 type = build_pointer_type (type);
9412 TREE_TYPE (decl) = type;
9414 else if (abstract_virtuals_error (decl, type))
9415 any_error = 1; /* Seems like a good idea. */
9416 else if (POINTER_TYPE_P (type))
9418 /* [dcl.fct]/6, parameter types cannot contain pointers
9419 (references) to arrays of unknown bound. */
9420 tree t = TREE_TYPE (type);
9421 int ptr = TYPE_PTR_P (type);
9427 else if (TREE_CODE (t) != ARRAY_TYPE)
9429 else if (!TYPE_DOMAIN (t))
9433 if (TREE_CODE (t) == ARRAY_TYPE)
9434 error ("parameter %qD includes %s to array of unknown "
9436 decl, ptr ? "pointer" : "reference", t);
9441 else if (init && !processing_template_decl)
9442 init = check_default_argument (decl, init);
9445 if (TREE_CODE (decl) == PARM_DECL
9446 && FUNCTION_PARAMETER_PACK_P (decl)
9448 error ("parameter packs must be at the end of the parameter list");
9450 if (DECL_NAME (decl))
9452 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9453 error ("multiple parameters named %qE", DECL_NAME (decl));
9455 pointer_set_insert (unique_decls, DECL_NAME (decl));
9458 TREE_CHAIN (decl) = decls;
9460 result = tree_cons (init, type, result);
9462 decls = nreverse (decls);
9463 result = nreverse (result);
9465 result = chainon (result, void_list_node);
9468 pointer_set_destroy (unique_decls);
9473 /* D is a constructor or overloaded `operator='.
9475 Let T be the class in which D is declared. Then, this function
9478 -1 if D's is an ill-formed constructor or copy assignment operator
9479 whose first parameter is of type `T'.
9480 0 if D is not a copy constructor or copy assignment
9482 1 if D is a copy constructor or copy assignment operator whose
9483 first parameter is a reference to const qualified T.
9484 2 if D is a copy constructor or copy assignment operator whose
9485 first parameter is a reference to non-const qualified T.
9487 This function can be used as a predicate. Positive values indicate
9488 a copy constructor and nonzero values indicate a copy assignment
9492 copy_fn_p (const_tree d)
9498 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9500 if (TREE_CODE (d) == TEMPLATE_DECL
9501 || (DECL_TEMPLATE_INFO (d)
9502 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9503 /* Instantiations of template member functions are never copy
9504 functions. Note that member functions of templated classes are
9505 represented as template functions internally, and we must
9506 accept those as copy functions. */
9509 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9513 arg_type = TREE_VALUE (args);
9514 if (arg_type == error_mark_node)
9517 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9519 /* Pass by value copy assignment operator. */
9522 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9523 && !TYPE_REF_IS_RVALUE (arg_type)
9524 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9526 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9532 args = TREE_CHAIN (args);
9534 if (args && args != void_list_node && !TREE_PURPOSE (args))
9535 /* There are more non-optional args. */
9541 /* D is a constructor or overloaded `operator='.
9543 Let T be the class in which D is declared. Then, this function
9544 returns true when D is a move constructor or move assignment
9545 operator, false otherwise. */
9548 move_fn_p (const_tree d)
9552 bool result = false;
9554 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9556 if (cxx_dialect == cxx98)
9557 /* There are no move constructors if we are in C++98 mode. */
9560 if (TREE_CODE (d) == TEMPLATE_DECL
9561 || (DECL_TEMPLATE_INFO (d)
9562 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9563 /* Instantiations of template member functions are never copy
9564 functions. Note that member functions of templated classes are
9565 represented as template functions internally, and we must
9566 accept those as copy functions. */
9569 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9573 arg_type = TREE_VALUE (args);
9574 if (arg_type == error_mark_node)
9577 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9578 && TYPE_REF_IS_RVALUE (arg_type)
9579 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9583 args = TREE_CHAIN (args);
9585 if (args && args != void_list_node && !TREE_PURPOSE (args))
9586 /* There are more non-optional args. */
9592 /* Remember any special properties of member function DECL. */
9595 grok_special_member_properties (tree decl)
9599 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9602 class_type = DECL_CONTEXT (decl);
9603 if (DECL_CONSTRUCTOR_P (decl))
9605 int ctor = copy_fn_p (decl);
9607 if (!DECL_ARTIFICIAL (decl))
9608 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9614 A non-template constructor for class X is a copy
9615 constructor if its first parameter is of type X&, const
9616 X&, volatile X& or const volatile X&, and either there
9617 are no other parameters or else all other parameters have
9618 default arguments. */
9619 TYPE_HAS_INIT_REF (class_type) = 1;
9621 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9623 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9624 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9626 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9630 A non-template assignment operator for class X is a copy
9631 assignment operator if its parameter is of type X, X&, const
9632 X&, volatile X& or const volatile X&. */
9634 int assop = copy_fn_p (decl);
9638 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9640 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9645 /* Check a constructor DECL has the correct form. Complains
9646 if the class has a constructor of the form X(X). */
9649 grok_ctor_properties (const_tree ctype, const_tree decl)
9651 int ctor_parm = copy_fn_p (decl);
9657 A declaration of a constructor for a class X is ill-formed if
9658 its first parameter is of type (optionally cv-qualified) X
9659 and either there are no other parameters or else all other
9660 parameters have default arguments.
9662 We *don't* complain about member template instantiations that
9663 have this form, though; they can occur as we try to decide
9664 what constructor to use during overload resolution. Since
9665 overload resolution will never prefer such a constructor to
9666 the non-template copy constructor (which is either explicitly
9667 or implicitly defined), there's no need to worry about their
9668 existence. Theoretically, they should never even be
9669 instantiated, but that's hard to forestall. */
9670 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9678 /* An operator with this code is unary, but can also be binary. */
9681 ambi_op_p (enum tree_code code)
9683 return (code == INDIRECT_REF
9684 || code == ADDR_EXPR
9685 || code == UNARY_PLUS_EXPR
9686 || code == NEGATE_EXPR
9687 || code == PREINCREMENT_EXPR
9688 || code == PREDECREMENT_EXPR);
9691 /* An operator with this name can only be unary. */
9694 unary_op_p (enum tree_code code)
9696 return (code == TRUTH_NOT_EXPR
9697 || code == BIT_NOT_EXPR
9698 || code == COMPONENT_REF
9699 || code == TYPE_EXPR);
9702 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9703 errors are issued for invalid declarations. */
9706 grok_op_properties (tree decl, bool complain)
9708 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9710 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9711 tree name = DECL_NAME (decl);
9712 enum tree_code operator_code;
9717 /* Count the number of arguments and check for ellipsis. */
9718 for (argtype = argtypes, arity = 0;
9719 argtype && argtype != void_list_node;
9720 argtype = TREE_CHAIN (argtype))
9722 ellipsis_p = !argtype;
9724 class_type = DECL_CONTEXT (decl);
9725 if (class_type && !CLASS_TYPE_P (class_type))
9726 class_type = NULL_TREE;
9728 if (DECL_CONV_FN_P (decl))
9729 operator_code = TYPE_EXPR;
9733 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9734 if (ansi_opname (CODE) == name) \
9736 operator_code = (CODE); \
9739 else if (ansi_assopname (CODE) == name) \
9741 operator_code = (CODE); \
9742 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9746 #include "operators.def"
9752 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9753 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9756 switch (operator_code)
9759 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9763 TYPE_GETS_DELETE (class_type) |= 1;
9767 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9770 case VEC_DELETE_EXPR:
9771 TYPE_GETS_DELETE (class_type) |= 2;
9778 /* [basic.std.dynamic.allocation]/1:
9780 A program is ill-formed if an allocation function is declared
9781 in a namespace scope other than global scope or declared static
9784 The same also holds true for deallocation functions. */
9785 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9786 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9788 if (DECL_NAMESPACE_SCOPE_P (decl))
9790 if (CP_DECL_CONTEXT (decl) != global_namespace)
9792 error ("%qD may not be declared within a namespace", decl);
9795 else if (!TREE_PUBLIC (decl))
9797 error ("%qD may not be declared as static", decl);
9803 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9805 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9806 DECL_IS_OPERATOR_NEW (decl) = 1;
9808 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9809 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9812 /* An operator function must either be a non-static member function
9813 or have at least one parameter of a class, a reference to a class,
9814 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9815 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9817 if (operator_code == TYPE_EXPR
9818 || operator_code == CALL_EXPR
9819 || operator_code == COMPONENT_REF
9820 || operator_code == ARRAY_REF
9821 || operator_code == NOP_EXPR)
9823 error ("%qD must be a nonstatic member function", decl);
9830 if (DECL_STATIC_FUNCTION_P (decl))
9832 error ("%qD must be either a non-static member "
9833 "function or a non-member function", decl);
9837 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9839 tree arg = non_reference (TREE_VALUE (p));
9840 if (arg == error_mark_node)
9843 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9844 because these checks are performed even on
9845 template functions. */
9846 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9850 if (!p || p == void_list_node)
9853 error ("%qD must have an argument of class or "
9854 "enumerated type", decl);
9860 /* There are no restrictions on the arguments to an overloaded
9862 if (operator_code == CALL_EXPR)
9865 /* Warn about conversion operators that will never be used. */
9866 if (IDENTIFIER_TYPENAME_P (name)
9867 && ! DECL_TEMPLATE_INFO (decl)
9869 /* Warn only declaring the function; there is no need to
9870 warn again about out-of-class definitions. */
9871 && class_type == current_class_type)
9873 tree t = TREE_TYPE (name);
9874 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9875 const char *what = 0;
9878 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9880 if (TREE_CODE (t) == VOID_TYPE)
9882 else if (class_type)
9884 if (t == class_type)
9885 what = "the same type";
9886 /* Don't force t to be complete here. */
9887 else if (IS_AGGR_TYPE (t)
9888 && COMPLETE_TYPE_P (t)
9889 && DERIVED_FROM_P (t, class_type))
9890 what = "a base class";
9894 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9895 "conversion operator",
9896 ref ? "a reference to " : "", what);
9899 if (operator_code == COND_EXPR)
9902 error ("ISO C++ prohibits overloading operator ?:");
9905 else if (ellipsis_p)
9907 error ("%qD must not have variable number of arguments", decl);
9910 else if (ambi_op_p (operator_code))
9913 /* We pick the one-argument operator codes by default, so
9914 we don't have to change anything. */
9916 else if (arity == 2)
9918 /* If we thought this was a unary operator, we now know
9919 it to be a binary operator. */
9920 switch (operator_code)
9923 operator_code = MULT_EXPR;
9927 operator_code = BIT_AND_EXPR;
9930 case UNARY_PLUS_EXPR:
9931 operator_code = PLUS_EXPR;
9935 operator_code = MINUS_EXPR;
9938 case PREINCREMENT_EXPR:
9939 operator_code = POSTINCREMENT_EXPR;
9942 case PREDECREMENT_EXPR:
9943 operator_code = POSTDECREMENT_EXPR;
9950 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9952 if ((operator_code == POSTINCREMENT_EXPR
9953 || operator_code == POSTDECREMENT_EXPR)
9954 && ! processing_template_decl
9955 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9958 error ("postfix %qD must take %<int%> as its argument",
9961 error ("postfix %qD must take %<int%> as its second "
9969 error ("%qD must take either zero or one argument", decl);
9971 error ("%qD must take either one or two arguments", decl);
9975 /* More Effective C++ rule 6. */
9977 && (operator_code == POSTINCREMENT_EXPR
9978 || operator_code == POSTDECREMENT_EXPR
9979 || operator_code == PREINCREMENT_EXPR
9980 || operator_code == PREDECREMENT_EXPR))
9982 tree arg = TREE_VALUE (argtypes);
9983 tree ret = TREE_TYPE (TREE_TYPE (decl));
9984 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9985 arg = TREE_TYPE (arg);
9986 arg = TYPE_MAIN_VARIANT (arg);
9987 if (operator_code == PREINCREMENT_EXPR
9988 || operator_code == PREDECREMENT_EXPR)
9990 if (TREE_CODE (ret) != REFERENCE_TYPE
9991 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9993 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
9994 build_reference_type (arg));
9998 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
9999 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10003 else if (unary_op_p (operator_code))
10008 error ("%qD must take %<void%>", decl);
10010 error ("%qD must take exactly one argument", decl);
10014 else /* if (binary_op_p (operator_code)) */
10019 error ("%qD must take exactly one argument", decl);
10021 error ("%qD must take exactly two arguments", decl);
10025 /* More Effective C++ rule 7. */
10027 && (operator_code == TRUTH_ANDIF_EXPR
10028 || operator_code == TRUTH_ORIF_EXPR
10029 || operator_code == COMPOUND_EXPR))
10030 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10034 /* Effective C++ rule 23. */
10037 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10038 && (operator_code == PLUS_EXPR
10039 || operator_code == MINUS_EXPR
10040 || operator_code == TRUNC_DIV_EXPR
10041 || operator_code == MULT_EXPR
10042 || operator_code == TRUNC_MOD_EXPR)
10043 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10044 warning (OPT_Weffc__, "%qD should return by value", decl);
10046 /* [over.oper]/8 */
10047 for (; argtypes && argtypes != void_list_node;
10048 argtypes = TREE_CHAIN (argtypes))
10049 if (TREE_PURPOSE (argtypes))
10051 TREE_PURPOSE (argtypes) = NULL_TREE;
10052 if (operator_code == POSTINCREMENT_EXPR
10053 || operator_code == POSTDECREMENT_EXPR)
10056 pedwarn ("%qD cannot have default arguments", decl);
10060 error ("%qD cannot have default arguments", decl);
10068 /* Return a string giving the keyword associate with CODE. */
10070 static const char *
10071 tag_name (enum tag_types code)
10083 case typename_type:
10086 gcc_unreachable ();
10090 /* Name lookup in an elaborated-type-specifier (after the keyword
10091 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10092 elaborated-type-specifier is invalid, issue a diagnostic and return
10093 error_mark_node; otherwise, return the *_TYPE to which it referred.
10094 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10097 check_elaborated_type_specifier (enum tag_types tag_code,
10099 bool allow_template_p)
10105 struct S { struct S *p; };
10107 name lookup will find the TYPE_DECL for the implicit "S::S"
10108 typedef. Adjust for that here. */
10109 if (DECL_SELF_REFERENCE_P (decl))
10110 decl = TYPE_NAME (TREE_TYPE (decl));
10112 type = TREE_TYPE (decl);
10114 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10115 is false for this case as well. */
10116 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10118 error ("using template type parameter %qT after %qs",
10119 type, tag_name (tag_code));
10120 return error_mark_node;
10124 If the identifier resolves to a typedef-name or a template
10125 type-parameter, the elaborated-type-specifier is ill-formed.
10127 In other words, the only legitimate declaration to use in the
10128 elaborated type specifier is the implicit typedef created when
10129 the type is declared. */
10130 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10131 && tag_code != typename_type)
10133 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10134 error ("%q+D has a previous declaration here", decl);
10135 return error_mark_node;
10137 else if (TREE_CODE (type) != RECORD_TYPE
10138 && TREE_CODE (type) != UNION_TYPE
10139 && tag_code != enum_type
10140 && tag_code != typename_type)
10142 error ("%qT referred to as %qs", type, tag_name (tag_code));
10143 error ("%q+T has a previous declaration here", type);
10144 return error_mark_node;
10146 else if (TREE_CODE (type) != ENUMERAL_TYPE
10147 && tag_code == enum_type)
10149 error ("%qT referred to as enum", type);
10150 error ("%q+T has a previous declaration here", type);
10151 return error_mark_node;
10153 else if (!allow_template_p
10154 && TREE_CODE (type) == RECORD_TYPE
10155 && CLASSTYPE_IS_TEMPLATE (type))
10157 /* If a class template appears as elaborated type specifier
10158 without a template header such as:
10160 template <class T> class C {};
10161 void f(class C); // No template header here
10163 then the required template argument is missing. */
10164 error ("template argument required for %<%s %T%>",
10165 tag_name (tag_code),
10166 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10167 return error_mark_node;
10173 /* Lookup NAME in elaborate type specifier in scope according to
10174 SCOPE and issue diagnostics if necessary.
10175 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10176 found, and ERROR_MARK_NODE for type error. */
10179 lookup_and_check_tag (enum tag_types tag_code, tree name,
10180 tag_scope scope, bool template_header_p)
10184 if (scope == ts_global)
10186 /* First try ordinary name lookup, ignoring hidden class name
10187 injected via friend declaration. */
10188 decl = lookup_name_prefer_type (name, 2);
10189 /* If that fails, the name will be placed in the smallest
10190 non-class, non-function-prototype scope according to 3.3.1/5.
10191 We may already have a hidden name declared as friend in this
10192 scope. So lookup again but not ignoring hidden names.
10193 If we find one, that name will be made visible rather than
10194 creating a new tag. */
10196 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10199 decl = lookup_type_scope (name, scope);
10201 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10202 decl = DECL_TEMPLATE_RESULT (decl);
10204 if (decl && TREE_CODE (decl) == TYPE_DECL)
10206 /* Look for invalid nested type:
10210 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10212 error ("%qD has the same name as the class in which it is "
10215 return error_mark_node;
10218 /* Two cases we need to consider when deciding if a class
10219 template is allowed as an elaborated type specifier:
10220 1. It is a self reference to its own class.
10221 2. It comes with a template header.
10225 template <class T> class C {
10226 class C *c1; // DECL_SELF_REFERENCE_P is true
10229 template <class U> class C; // template_header_p is true
10230 template <class T> class C<T>::D {
10231 class C *c2; // DECL_SELF_REFERENCE_P is true
10234 t = check_elaborated_type_specifier (tag_code,
10237 | DECL_SELF_REFERENCE_P (decl));
10240 else if (decl && TREE_CODE (decl) == TREE_LIST)
10242 error ("reference to %qD is ambiguous", name);
10243 print_candidates (decl);
10244 return error_mark_node;
10250 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10251 Define the tag as a forward-reference if it is not defined.
10253 If a declaration is given, process it here, and report an error if
10254 multiple declarations are not identical.
10256 SCOPE is TS_CURRENT when this is also a definition. Only look in
10257 the current frame for the name (since C++ allows new names in any
10258 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10259 declaration. Only look beginning from the current scope outward up
10260 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10262 TEMPLATE_HEADER_P is true when this declaration is preceded by
10263 a set of template parameters. */
10266 xref_tag (enum tag_types tag_code, tree name,
10267 tag_scope scope, bool template_header_p)
10269 enum tree_code code;
10271 tree context = NULL_TREE;
10273 timevar_push (TV_NAME_LOOKUP);
10275 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10281 code = RECORD_TYPE;
10287 code = ENUMERAL_TYPE;
10290 gcc_unreachable ();
10293 /* In case of anonymous name, xref_tag is only called to
10294 make type node and push name. Name lookup is not required. */
10295 if (ANON_AGGRNAME_P (name))
10298 t = lookup_and_check_tag (tag_code, name,
10299 scope, template_header_p);
10301 if (t == error_mark_node)
10302 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10304 if (scope != ts_current && t && current_class_type
10305 && template_class_depth (current_class_type)
10306 && template_header_p)
10308 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10309 definition of this tag. Since, in addition, we are currently
10310 processing a (member) template declaration of a template
10311 class, we must be very careful; consider:
10318 { template <class V>
10319 friend struct S1; };
10321 Here, the S2::S1 declaration should not be confused with the
10322 outer declaration. In particular, the inner version should
10323 have a template parameter of level 2, not level 1. This
10324 would be particularly important if the member declaration
10327 template <class V = U> friend struct S1;
10329 say, when we should tsubst into `U' when instantiating
10330 S2. On the other hand, when presented with:
10340 we must find the inner binding eventually. We
10341 accomplish this by making sure that the new type we
10342 create to represent this declaration has the right
10344 context = TYPE_CONTEXT (t);
10350 /* If no such tag is yet defined, create a forward-reference node
10351 and record it as the "definition".
10352 When a real declaration of this type is found,
10353 the forward-reference will be altered into a real type. */
10354 if (code == ENUMERAL_TYPE)
10356 error ("use of enum %q#D without previous declaration", name);
10357 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10361 t = make_aggr_type (code);
10362 TYPE_CONTEXT (t) = context;
10363 t = pushtag (name, t, scope);
10368 if (template_header_p && IS_AGGR_TYPE (t))
10370 if (!redeclare_class_template (t, current_template_parms))
10371 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10373 else if (!processing_template_decl
10374 && CLASS_TYPE_P (t)
10375 && CLASSTYPE_IS_TEMPLATE (t))
10377 error ("redeclaration of %qT as a non-template", t);
10378 error ("previous declaration %q+D", t);
10379 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10382 /* Make injected friend class visible. */
10383 if (scope != ts_within_enclosing_non_class
10384 && hidden_name_p (TYPE_NAME (t)))
10386 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10387 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10389 if (TYPE_TEMPLATE_INFO (t))
10391 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10392 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10397 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10401 xref_tag_from_type (tree old, tree id, tag_scope scope)
10403 enum tag_types tag_kind;
10405 if (TREE_CODE (old) == RECORD_TYPE)
10406 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10408 tag_kind = union_type;
10410 if (id == NULL_TREE)
10411 id = TYPE_IDENTIFIER (old);
10413 return xref_tag (tag_kind, id, scope, false);
10416 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10417 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10418 access_* node, and the TREE_VALUE is the type of the base-class.
10419 Non-NULL TREE_TYPE indicates virtual inheritance.
10421 Returns true if the binfo hierarchy was successfully created,
10422 false if an error was detected. */
10425 xref_basetypes (tree ref, tree base_list)
10428 tree binfo, base_binfo;
10429 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10430 unsigned max_bases = 0; /* Maximum direct bases. */
10432 tree default_access;
10433 tree igo_prev; /* Track Inheritance Graph Order. */
10435 if (ref == error_mark_node)
10438 /* The base of a derived class is private by default, all others are
10440 default_access = (TREE_CODE (ref) == RECORD_TYPE
10441 && CLASSTYPE_DECLARED_CLASS (ref)
10442 ? access_private_node : access_public_node);
10444 /* First, make sure that any templates in base-classes are
10445 instantiated. This ensures that if we call ourselves recursively
10446 we do not get confused about which classes are marked and which
10448 basep = &base_list;
10451 tree basetype = TREE_VALUE (*basep);
10453 if (!(processing_template_decl && uses_template_parms (basetype))
10454 && !complete_type_or_else (basetype, NULL))
10455 /* An incomplete type. Remove it from the list. */
10456 *basep = TREE_CHAIN (*basep);
10460 if (TREE_TYPE (*basep))
10462 if (CLASS_TYPE_P (basetype))
10463 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10464 basep = &TREE_CHAIN (*basep);
10468 TYPE_MARKED_P (ref) = 1;
10470 /* The binfo slot should be empty, unless this is an (ill-formed)
10472 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10473 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10475 binfo = make_tree_binfo (max_bases);
10477 TYPE_BINFO (ref) = binfo;
10478 BINFO_OFFSET (binfo) = size_zero_node;
10479 BINFO_TYPE (binfo) = ref;
10483 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10484 /* An aggregate cannot have baseclasses. */
10485 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10487 if (TREE_CODE (ref) == UNION_TYPE)
10489 error ("derived union %qT invalid", ref);
10496 if (TYPE_FOR_JAVA (ref))
10498 error ("Java class %qT cannot have multiple bases", ref);
10505 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10507 if (TYPE_FOR_JAVA (ref))
10509 error ("Java class %qT cannot have virtual bases", ref);
10514 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10516 tree access = TREE_PURPOSE (base_list);
10517 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10518 tree basetype = TREE_VALUE (base_list);
10520 if (access == access_default_node)
10521 access = default_access;
10523 if (PACK_EXPANSION_P (basetype))
10524 basetype = PACK_EXPANSION_PATTERN (basetype);
10525 if (TREE_CODE (basetype) == TYPE_DECL)
10526 basetype = TREE_TYPE (basetype);
10527 if (TREE_CODE (basetype) != RECORD_TYPE
10528 && TREE_CODE (basetype) != TYPENAME_TYPE
10529 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10530 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10532 error ("base type %qT fails to be a struct or class type",
10537 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10538 TYPE_FOR_JAVA (ref) = 1;
10540 base_binfo = NULL_TREE;
10541 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10543 base_binfo = TYPE_BINFO (basetype);
10544 /* The original basetype could have been a typedef'd type. */
10545 basetype = BINFO_TYPE (base_binfo);
10547 /* Inherit flags from the base. */
10548 TYPE_HAS_NEW_OPERATOR (ref)
10549 |= TYPE_HAS_NEW_OPERATOR (basetype);
10550 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10551 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10552 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10553 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10554 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10555 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10556 CLASSTYPE_REPEATED_BASE_P (ref)
10557 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10560 /* We must do this test after we've seen through a typedef
10562 if (TYPE_MARKED_P (basetype))
10564 if (basetype == ref)
10565 error ("recursive type %qT undefined", basetype);
10567 error ("duplicate base type %qT invalid", basetype);
10571 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10572 /* Regenerate the pack expansion for the bases. */
10573 basetype = make_pack_expansion (basetype);
10575 TYPE_MARKED_P (basetype) = 1;
10577 base_binfo = copy_binfo (base_binfo, basetype, ref,
10578 &igo_prev, via_virtual);
10579 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10580 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10582 BINFO_BASE_APPEND (binfo, base_binfo);
10583 BINFO_BASE_ACCESS_APPEND (binfo, access);
10586 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10587 /* If we have space in the vbase vector, we must have shared at
10588 least one of them, and are therefore diamond shaped. */
10589 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10591 /* Unmark all the types. */
10592 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10593 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10594 TYPE_MARKED_P (ref) = 0;
10596 /* Now see if we have a repeated base type. */
10597 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10599 for (base_binfo = binfo; base_binfo;
10600 base_binfo = TREE_CHAIN (base_binfo))
10602 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10604 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10607 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10609 for (base_binfo = binfo; base_binfo;
10610 base_binfo = TREE_CHAIN (base_binfo))
10611 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10612 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10621 /* Begin compiling the definition of an enumeration type.
10623 Returns the type object, as yet incomplete.
10624 Also records info about it so that build_enumerator
10625 may be used to declare the individual values as they are read. */
10628 start_enum (tree name)
10632 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10634 /* If this is the real definition for a previous forward reference,
10635 fill in the contents in the same object that used to be the
10636 forward reference. */
10638 enumtype = lookup_and_check_tag (enum_type, name,
10639 /*tag_scope=*/ts_current,
10640 /*template_header_p=*/false);
10642 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10644 error ("multiple definition of %q#T", enumtype);
10645 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10646 /* Clear out TYPE_VALUES, and start again. */
10647 TYPE_VALUES (enumtype) = NULL_TREE;
10651 /* In case of error, make a dummy enum to allow parsing to
10653 if (enumtype == error_mark_node)
10654 name = make_anon_name ();
10656 enumtype = make_node (ENUMERAL_TYPE);
10657 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10663 /* After processing and defining all the values of an enumeration type,
10664 install their decls in the enumeration type and finish it off.
10665 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10668 finish_enum (tree enumtype)
10677 bool use_short_enum;
10681 integer_type_kind itk;
10682 tree underlying_type = NULL_TREE;
10684 /* We built up the VALUES in reverse order. */
10685 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10687 /* For an enum defined in a template, just set the type of the values;
10688 all further processing is postponed until the template is
10689 instantiated. We need to set the type so that tsubst of a CONST_DECL
10691 if (processing_template_decl)
10693 for (values = TYPE_VALUES (enumtype);
10695 values = TREE_CHAIN (values))
10696 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10697 if (at_function_scope_p ())
10698 add_stmt (build_min (TAG_DEFN, enumtype));
10702 /* Determine the minimum and maximum values of the enumerators. */
10703 if (TYPE_VALUES (enumtype))
10705 minnode = maxnode = NULL_TREE;
10707 for (values = TYPE_VALUES (enumtype);
10709 values = TREE_CHAIN (values))
10711 decl = TREE_VALUE (values);
10713 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10714 each enumerator has the type of its enumeration. Prior to the
10715 closing brace, the type of each enumerator is the type of its
10716 initializing value. */
10717 TREE_TYPE (decl) = enumtype;
10719 /* Update the minimum and maximum values, if appropriate. */
10720 value = DECL_INITIAL (decl);
10721 if (value == error_mark_node)
10722 value = integer_zero_node;
10723 /* Figure out what the minimum and maximum values of the
10724 enumerators are. */
10726 minnode = maxnode = value;
10727 else if (tree_int_cst_lt (maxnode, value))
10729 else if (tree_int_cst_lt (value, minnode))
10736 If the enumerator-list is empty, the underlying type is as if
10737 the enumeration had a single enumerator with value 0. */
10738 minnode = maxnode = integer_zero_node;
10740 /* Compute the number of bits require to represent all values of the
10741 enumeration. We must do this before the type of MINNODE and
10742 MAXNODE are transformed, since min_precision relies on the
10743 TREE_TYPE of the value it is passed. */
10744 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10745 lowprec = min_precision (minnode, unsignedp);
10746 highprec = min_precision (maxnode, unsignedp);
10747 precision = MAX (lowprec, highprec);
10749 /* Determine the underlying type of the enumeration.
10753 The underlying type of an enumeration is an integral type that
10754 can represent all the enumerator values defined in the
10755 enumeration. It is implementation-defined which integral type is
10756 used as the underlying type for an enumeration except that the
10757 underlying type shall not be larger than int unless the value of
10758 an enumerator cannot fit in an int or unsigned int.
10760 We use "int" or an "unsigned int" as the underlying type, even if
10761 a smaller integral type would work, unless the user has
10762 explicitly requested that we use the smallest possible type. The
10763 user can request that for all enumerations with a command line
10764 flag, or for just one enumeration with an attribute. */
10766 use_short_enum = flag_short_enums
10767 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10769 for (itk = (use_short_enum ? itk_char : itk_int);
10773 underlying_type = integer_types[itk];
10774 if (TYPE_PRECISION (underlying_type) >= precision
10775 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10778 if (itk == itk_none)
10782 IF no integral type can represent all the enumerator values, the
10783 enumeration is ill-formed. */
10784 error ("no integral type can represent all of the enumerator values "
10785 "for %qT", enumtype);
10786 precision = TYPE_PRECISION (long_long_integer_type_node);
10787 underlying_type = integer_types[itk_unsigned_long_long];
10790 /* Compute the minium and maximum values for the type.
10794 For an enumeration where emin is the smallest enumerator and emax
10795 is the largest, the values of the enumeration are the values of the
10796 underlying type in the range bmin to bmax, where bmin and bmax are,
10797 respectively, the smallest and largest values of the smallest bit-
10798 field that can store emin and emax. */
10800 /* The middle-end currently assumes that types with TYPE_PRECISION
10801 narrower than their underlying type are suitably zero or sign
10802 extended to fill their mode. g++ doesn't make these guarantees.
10803 Until the middle-end can represent such paradoxical types, we
10804 set the TYPE_PRECISION to the width of the underlying type. */
10805 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10807 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10811 The value of sizeof() applied to an enumeration type, an object
10812 of an enumeration type, or an enumerator, is the value of sizeof()
10813 applied to the underlying type. */
10814 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10815 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10816 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10817 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10818 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10819 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10821 /* Convert each of the enumerators to the type of the underlying
10822 type of the enumeration. */
10823 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10825 location_t saved_location;
10827 decl = TREE_VALUE (values);
10828 saved_location = input_location;
10829 input_location = DECL_SOURCE_LOCATION (decl);
10830 value = perform_implicit_conversion (underlying_type,
10831 DECL_INITIAL (decl));
10832 input_location = saved_location;
10834 /* Do not clobber shared ints. */
10835 value = copy_node (value);
10837 TREE_TYPE (value) = enumtype;
10838 DECL_INITIAL (decl) = value;
10839 TREE_VALUE (values) = value;
10842 /* Fix up all variant types of this enum type. */
10843 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10845 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10846 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10847 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10848 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10849 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10850 TYPE_MODE (t) = TYPE_MODE (enumtype);
10851 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10852 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10853 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10854 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10857 /* Finish debugging output for this type. */
10858 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10861 /* Build and install a CONST_DECL for an enumeration constant of the
10862 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10863 Assignment of sequential values by default is handled here. */
10866 build_enumerator (tree name, tree value, tree enumtype)
10872 /* If the VALUE was erroneous, pretend it wasn't there; that will
10873 result in the enum being assigned the next value in sequence. */
10874 if (value == error_mark_node)
10877 /* Remove no-op casts from the value. */
10879 STRIP_TYPE_NOPS (value);
10881 if (! processing_template_decl)
10883 /* Validate and default VALUE. */
10884 if (value != NULL_TREE)
10886 value = integral_constant_value (value);
10888 if (TREE_CODE (value) == INTEGER_CST)
10890 value = perform_integral_promotions (value);
10891 constant_expression_warning (value);
10895 error ("enumerator value for %qD is not an integer constant", name);
10900 /* Default based on previous value. */
10901 if (value == NULL_TREE)
10903 if (TYPE_VALUES (enumtype))
10906 unsigned HOST_WIDE_INT lo;
10910 /* The next value is the previous value plus one. We can
10911 safely assume that the previous value is an INTEGER_CST.
10912 add_double doesn't know the type of the target expression,
10913 so we must check with int_fits_type_p as well. */
10914 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10915 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10916 TREE_INT_CST_HIGH (prev_value),
10918 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10919 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10923 error ("overflow in enumeration values at %qD", name);
10924 value = error_mark_node;
10928 value = integer_zero_node;
10931 /* Remove no-op casts from the value. */
10932 STRIP_TYPE_NOPS (value);
10935 /* C++ associates enums with global, function, or class declarations. */
10936 context = current_scope ();
10938 /* Build the actual enumeration constant. Note that the enumeration
10939 constants have the type of their initializers until the
10940 enumeration is complete:
10944 Following the closing brace of an enum-specifier, each enumer-
10945 ator has the type of its enumeration. Prior to the closing
10946 brace, the type of each enumerator is the type of its
10947 initializing value.
10949 In finish_enum we will reset the type. Of course, if we're
10950 processing a template, there may be no value. */
10951 type = value ? TREE_TYPE (value) : NULL_TREE;
10953 if (context && context == current_class_type)
10954 /* This enum declaration is local to the class. We need the full
10955 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10956 decl = build_lang_decl (CONST_DECL, name, type);
10958 /* It's a global enum, or it's local to a function. (Note local to
10959 a function could mean local to a class method. */
10960 decl = build_decl (CONST_DECL, name, type);
10962 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10963 TREE_CONSTANT (decl) = 1;
10964 TREE_INVARIANT (decl) = 1;
10965 TREE_READONLY (decl) = 1;
10966 DECL_INITIAL (decl) = value;
10968 if (context && context == current_class_type)
10969 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10970 on the TYPE_FIELDS list for `S'. (That's so that you can say
10971 things like `S::i' later.) */
10972 finish_member_declaration (decl);
10976 /* Add this enumeration constant to the list for this type. */
10977 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10981 /* We're defining DECL. Make sure that it's type is OK. */
10984 check_function_type (tree decl, tree current_function_parms)
10986 tree fntype = TREE_TYPE (decl);
10987 tree return_type = complete_type (TREE_TYPE (fntype));
10989 /* In a function definition, arg types must be complete. */
10990 require_complete_types_for_parms (current_function_parms);
10992 if (dependent_type_p (return_type))
10994 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
10995 || (TYPE_FOR_JAVA (return_type) && IS_AGGR_TYPE (return_type)))
10997 tree args = TYPE_ARG_TYPES (fntype);
10999 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11000 error ("return type %q#T is incomplete", return_type);
11002 error ("return type has Java class type %q#T", return_type);
11004 /* Make it return void instead. */
11005 if (TREE_CODE (fntype) == METHOD_TYPE)
11006 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11008 TREE_CHAIN (args));
11010 fntype = build_function_type (void_type_node, args);
11012 = build_exception_variant (fntype,
11013 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11016 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11019 /* Create the FUNCTION_DECL for a function definition.
11020 DECLSPECS and DECLARATOR are the parts of the declaration;
11021 they describe the function's name and the type it returns,
11022 but twisted together in a fashion that parallels the syntax of C.
11024 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11025 DECLARATOR is really the DECL for the function we are about to
11026 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11027 indicating that the function is an inline defined in-class.
11029 This function creates a binding context for the function body
11030 as well as setting up the FUNCTION_DECL in current_function_decl.
11032 For C++, we must first check whether that datum makes any sense.
11033 For example, "class A local_a(1,2);" means that variable local_a
11034 is an aggregate of type A, which should have a constructor
11035 applied to it with the argument list [1, 2].
11037 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11038 or may be a BLOCK if the function has been defined previously
11039 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11040 error_mark_node if the function has never been defined, or
11041 a BLOCK if the function has been defined somewhere. */
11044 start_preparsed_function (tree decl1, tree attrs, int flags)
11046 tree ctype = NULL_TREE;
11049 int doing_friend = 0;
11050 struct cp_binding_level *bl;
11051 tree current_function_parms;
11052 struct c_fileinfo *finfo
11053 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11054 bool honor_interface;
11056 /* Sanity check. */
11057 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11058 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11060 fntype = TREE_TYPE (decl1);
11061 if (TREE_CODE (fntype) == METHOD_TYPE)
11062 ctype = TYPE_METHOD_BASETYPE (fntype);
11064 /* ISO C++ 11.4/5. A friend function defined in a class is in
11065 the (lexical) scope of the class in which it is defined. */
11066 if (!ctype && DECL_FRIEND_P (decl1))
11068 ctype = DECL_FRIEND_CONTEXT (decl1);
11070 /* CTYPE could be null here if we're dealing with a template;
11071 for example, `inline friend float foo()' inside a template
11072 will have no CTYPE set. */
11073 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11079 if (DECL_DECLARED_INLINE_P (decl1)
11080 && lookup_attribute ("noinline", attrs))
11081 warning (0, "inline function %q+D given attribute noinline", decl1);
11083 /* Handle gnu_inline attribute. */
11084 if (GNU_INLINE_P (decl1))
11086 DECL_EXTERNAL (decl1) = 1;
11087 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11088 DECL_INTERFACE_KNOWN (decl1) = 1;
11089 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11092 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11093 /* This is a constructor, we must ensure that any default args
11094 introduced by this definition are propagated to the clones
11095 now. The clones are used directly in overload resolution. */
11096 adjust_clone_args (decl1);
11098 /* Sometimes we don't notice that a function is a static member, and
11099 build a METHOD_TYPE for it. Fix that up now. */
11100 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11101 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11103 revert_static_member_fn (decl1);
11107 /* Set up current_class_type, and enter the scope of the class, if
11110 push_nested_class (ctype);
11111 else if (DECL_STATIC_FUNCTION_P (decl1))
11112 push_nested_class (DECL_CONTEXT (decl1));
11114 /* Now that we have entered the scope of the class, we must restore
11115 the bindings for any template parameters surrounding DECL1, if it
11116 is an inline member template. (Order is important; consider the
11117 case where a template parameter has the same name as a field of
11118 the class.) It is not until after this point that
11119 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11120 if (flags & SF_INCLASS_INLINE)
11121 maybe_begin_member_template_processing (decl1);
11123 /* Effective C++ rule 15. */
11125 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11126 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11127 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11129 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11130 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11131 if (!DECL_INITIAL (decl1))
11132 DECL_INITIAL (decl1) = error_mark_node;
11134 /* This function exists in static storage.
11135 (This does not mean `static' in the C sense!) */
11136 TREE_STATIC (decl1) = 1;
11138 /* We must call push_template_decl after current_class_type is set
11139 up. (If we are processing inline definitions after exiting a
11140 class scope, current_class_type will be NULL_TREE until set above
11141 by push_nested_class.) */
11142 if (processing_template_decl)
11144 /* FIXME: Handle error_mark_node more gracefully. */
11145 tree newdecl1 = push_template_decl (decl1);
11146 if (newdecl1 != error_mark_node)
11150 /* We are now in the scope of the function being defined. */
11151 current_function_decl = decl1;
11153 /* Save the parm names or decls from this function's declarator
11154 where store_parm_decls will find them. */
11155 current_function_parms = DECL_ARGUMENTS (decl1);
11157 /* Make sure the parameter and return types are reasonable. When
11158 you declare a function, these types can be incomplete, but they
11159 must be complete when you define the function. */
11160 check_function_type (decl1, current_function_parms);
11162 /* Build the return declaration for the function. */
11163 restype = TREE_TYPE (fntype);
11164 if (DECL_RESULT (decl1) == NULL_TREE)
11168 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11169 DECL_ARTIFICIAL (resdecl) = 1;
11170 DECL_IGNORED_P (resdecl) = 1;
11171 DECL_RESULT (decl1) = resdecl;
11173 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11176 /* Let the user know we're compiling this function. */
11177 announce_function (decl1);
11179 /* Record the decl so that the function name is defined.
11180 If we already have a decl for this name, and it is a FUNCTION_DECL,
11181 use the old decl. */
11182 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11184 /* A specialization is not used to guide overload resolution. */
11185 if (!DECL_FUNCTION_MEMBER_P (decl1)
11186 && !(DECL_USE_TEMPLATE (decl1) &&
11187 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11189 tree olddecl = pushdecl (decl1);
11191 if (olddecl == error_mark_node)
11192 /* If something went wrong when registering the declaration,
11193 use DECL1; we have to have a FUNCTION_DECL to use when
11194 parsing the body of the function. */
11198 /* Otherwise, OLDDECL is either a previous declaration
11199 of the same function or DECL1 itself. */
11201 if (warn_missing_declarations
11202 && olddecl == decl1
11203 && !DECL_MAIN_P (decl1)
11204 && TREE_PUBLIC (decl1)
11205 && !DECL_DECLARED_INLINE_P (decl1))
11209 /* Check whether DECL1 is in an anonymous
11211 for (context = DECL_CONTEXT (decl1);
11213 context = DECL_CONTEXT (context))
11215 if (TREE_CODE (context) == NAMESPACE_DECL
11216 && DECL_NAME (context) == NULL_TREE)
11220 if (context == NULL)
11221 warning (OPT_Wmissing_declarations,
11222 "no previous declaration for %q+D", decl1);
11230 /* We need to set the DECL_CONTEXT. */
11231 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11232 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11234 fntype = TREE_TYPE (decl1);
11236 /* If #pragma weak applies, mark the decl appropriately now.
11237 The pragma only applies to global functions. Because
11238 determining whether or not the #pragma applies involves
11239 computing the mangled name for the declaration, we cannot
11240 apply the pragma until after we have merged this declaration
11241 with any previous declarations; if the original declaration
11242 has a linkage specification, that specification applies to
11243 the definition as well, and may affect the mangled name. */
11244 if (!DECL_CONTEXT (decl1))
11245 maybe_apply_pragma_weak (decl1);
11248 /* Reset this in case the call to pushdecl changed it. */
11249 current_function_decl = decl1;
11251 gcc_assert (DECL_INITIAL (decl1));
11253 /* This function may already have been parsed, in which case just
11254 return; our caller will skip over the body without parsing. */
11255 if (DECL_INITIAL (decl1) != error_mark_node)
11258 /* Initialize RTL machinery. We cannot do this until
11259 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11260 even when processing a template; this is how we get
11261 CFUN set up, and our per-function variables initialized.
11262 FIXME factor out the non-RTL stuff. */
11263 bl = current_binding_level;
11264 allocate_struct_function (decl1, processing_template_decl);
11265 current_binding_level = bl;
11267 /* Even though we're inside a function body, we still don't want to
11268 call expand_expr to calculate the size of a variable-sized array.
11269 We haven't necessarily assigned RTL to all variables yet, so it's
11270 not safe to try to expand expressions involving them. */
11271 cfun->x_dont_save_pending_sizes_p = 1;
11273 /* Start the statement-tree, start the tree now. */
11274 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11276 /* If we are (erroneously) defining a function that we have already
11277 defined before, wipe out what we knew before. */
11278 if (!DECL_PENDING_INLINE_P (decl1))
11279 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11281 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11283 /* We know that this was set up by `grokclassfn'. We do not
11284 wait until `store_parm_decls', since evil parse errors may
11285 never get us to that point. Here we keep the consistency
11286 between `current_class_type' and `current_class_ptr'. */
11287 tree t = DECL_ARGUMENTS (decl1);
11289 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11290 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11292 cp_function_chain->x_current_class_ref
11293 = build_indirect_ref (t, NULL);
11294 cp_function_chain->x_current_class_ptr = t;
11296 /* Constructors and destructors need to know whether they're "in
11297 charge" of initializing virtual base classes. */
11298 t = TREE_CHAIN (t);
11299 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11301 current_in_charge_parm = t;
11302 t = TREE_CHAIN (t);
11304 if (DECL_HAS_VTT_PARM_P (decl1))
11306 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11307 current_vtt_parm = t;
11311 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11312 /* Implicitly-defined methods (like the
11313 destructor for a class in which no destructor
11314 is explicitly declared) must not be defined
11315 until their definition is needed. So, we
11316 ignore interface specifications for
11317 compiler-generated functions. */
11318 && !DECL_ARTIFICIAL (decl1));
11320 if (DECL_INTERFACE_KNOWN (decl1))
11322 tree ctx = decl_function_context (decl1);
11324 if (DECL_NOT_REALLY_EXTERN (decl1))
11325 DECL_EXTERNAL (decl1) = 0;
11327 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11328 && TREE_PUBLIC (ctx))
11329 /* This is a function in a local class in an extern inline
11331 comdat_linkage (decl1);
11333 /* If this function belongs to an interface, it is public.
11334 If it belongs to someone else's interface, it is also external.
11335 This only affects inlines and template instantiations. */
11336 else if (!finfo->interface_unknown && honor_interface)
11338 if (DECL_DECLARED_INLINE_P (decl1)
11339 || DECL_TEMPLATE_INSTANTIATION (decl1)
11340 || processing_template_decl)
11342 DECL_EXTERNAL (decl1)
11343 = (finfo->interface_only
11344 || (DECL_DECLARED_INLINE_P (decl1)
11345 && ! flag_implement_inlines
11346 && !DECL_VINDEX (decl1)));
11348 /* For WIN32 we also want to put these in linkonce sections. */
11349 maybe_make_one_only (decl1);
11352 DECL_EXTERNAL (decl1) = 0;
11353 DECL_INTERFACE_KNOWN (decl1) = 1;
11354 /* If this function is in an interface implemented in this file,
11355 make sure that the back end knows to emit this function
11357 if (!DECL_EXTERNAL (decl1))
11358 mark_needed (decl1);
11360 else if (finfo->interface_unknown && finfo->interface_only
11361 && honor_interface)
11363 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11364 interface, we will have both finfo->interface_unknown and
11365 finfo->interface_only set. In that case, we don't want to
11366 use the normal heuristics because someone will supply a
11367 #pragma implementation elsewhere, and deducing it here would
11368 produce a conflict. */
11369 comdat_linkage (decl1);
11370 DECL_EXTERNAL (decl1) = 0;
11371 DECL_INTERFACE_KNOWN (decl1) = 1;
11372 DECL_DEFER_OUTPUT (decl1) = 1;
11376 /* This is a definition, not a reference.
11377 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11378 if (!GNU_INLINE_P (decl1))
11379 DECL_EXTERNAL (decl1) = 0;
11381 if ((DECL_DECLARED_INLINE_P (decl1)
11382 || DECL_TEMPLATE_INSTANTIATION (decl1))
11383 && ! DECL_INTERFACE_KNOWN (decl1)
11384 /* Don't try to defer nested functions for now. */
11385 && ! decl_function_context (decl1))
11386 DECL_DEFER_OUTPUT (decl1) = 1;
11388 DECL_INTERFACE_KNOWN (decl1) = 1;
11391 /* Determine the ELF visibility attribute for the function. We must not
11392 do this before calling "pushdecl", as we must allow "duplicate_decls"
11393 to merge any attributes appropriately. We also need to wait until
11395 if (!DECL_CLONED_FUNCTION_P (decl1))
11396 determine_visibility (decl1);
11398 begin_scope (sk_function_parms, decl1);
11402 if (DECL_DESTRUCTOR_P (decl1)
11403 || (DECL_CONSTRUCTOR_P (decl1)
11404 && targetm.cxx.cdtor_returns_this ()))
11406 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11407 DECL_CONTEXT (cdtor_label) = current_function_decl;
11410 start_fname_decls ();
11412 store_parm_decls (current_function_parms);
11416 /* Like start_preparsed_function, except that instead of a
11417 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11419 Returns 1 on success. If the DECLARATOR is not suitable for a function
11420 (it defines a datum instead), we return 0, which tells
11421 yyparse to report a parse error. */
11424 start_function (cp_decl_specifier_seq *declspecs,
11425 const cp_declarator *declarator,
11430 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11431 /* If the declarator is not suitable for a function definition,
11432 cause a syntax error. */
11433 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11436 if (DECL_MAIN_P (decl1))
11437 /* main must return int. grokfndecl should have corrected it
11438 (and issued a diagnostic) if the user got it wrong. */
11439 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11440 integer_type_node));
11442 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11447 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11451 use_eh_spec_block (tree fn)
11453 return (flag_exceptions && flag_enforce_eh_specs
11454 && !processing_template_decl
11455 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11456 /* We insert the EH_SPEC_BLOCK only in the original
11457 function; then, it is copied automatically to the
11459 && !DECL_CLONED_FUNCTION_P (fn)
11460 /* Implicitly-generated constructors and destructors have
11461 exception specifications. However, those specifications
11462 are the union of the possible exceptions specified by the
11463 constructors/destructors for bases and members, so no
11464 unallowed exception will ever reach this function. By
11465 not creating the EH_SPEC_BLOCK we save a little memory,
11466 and we avoid spurious warnings about unreachable
11468 && !DECL_ARTIFICIAL (fn));
11471 /* Store the parameter declarations into the current function declaration.
11472 This is called after parsing the parameter declarations, before
11473 digesting the body of the function.
11475 Also install to binding contour return value identifier, if any. */
11478 store_parm_decls (tree current_function_parms)
11480 tree fndecl = current_function_decl;
11483 /* This is a chain of any other decls that came in among the parm
11484 declarations. If a parm is declared with enum {foo, bar} x;
11485 then CONST_DECLs for foo and bar are put here. */
11486 tree nonparms = NULL_TREE;
11488 if (current_function_parms)
11490 /* This case is when the function was defined with an ANSI prototype.
11491 The parms already have decls, so we need not do anything here
11492 except record them as in effect
11493 and complain if any redundant old-style parm decls were written. */
11495 tree specparms = current_function_parms;
11498 /* Must clear this because it might contain TYPE_DECLs declared
11500 current_binding_level->names = NULL;
11502 /* If we're doing semantic analysis, then we'll call pushdecl
11503 for each of these. We must do them in reverse order so that
11504 they end in the correct forward order. */
11505 specparms = nreverse (specparms);
11507 for (parm = specparms; parm; parm = next)
11509 next = TREE_CHAIN (parm);
11510 if (TREE_CODE (parm) == PARM_DECL)
11512 if (DECL_NAME (parm) == NULL_TREE
11513 || TREE_CODE (parm) != VOID_TYPE)
11516 error ("parameter %qD declared void", parm);
11520 /* If we find an enum constant or a type tag,
11521 put it aside for the moment. */
11522 TREE_CHAIN (parm) = NULL_TREE;
11523 nonparms = chainon (nonparms, parm);
11527 /* Get the decls in their original chain order and record in the
11528 function. This is all and only the PARM_DECLs that were
11529 pushed into scope by the loop above. */
11530 DECL_ARGUMENTS (fndecl) = getdecls ();
11533 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11535 /* Now store the final chain of decls for the arguments
11536 as the decl-chain of the current lexical scope.
11537 Put the enumerators in as well, at the front so that
11538 DECL_ARGUMENTS is not modified. */
11539 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11541 if (use_eh_spec_block (current_function_decl))
11542 current_eh_spec_block = begin_eh_spec_block ();
11546 /* We have finished doing semantic analysis on DECL, but have not yet
11547 generated RTL for its body. Save away our current state, so that
11548 when we want to generate RTL later we know what to do. */
11551 save_function_data (tree decl)
11553 struct language_function *f;
11555 /* Save the language-specific per-function data so that we can
11556 get it back when we really expand this function. */
11557 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11560 f = GGC_NEW (struct language_function);
11561 memcpy (f, cp_function_chain, sizeof (struct language_function));
11562 DECL_SAVED_FUNCTION_DATA (decl) = f;
11564 /* Clear out the bits we don't need. */
11565 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11566 f->bindings = NULL;
11567 f->x_local_names = NULL;
11571 /* Set the return value of the constructor (if present). */
11574 finish_constructor_body (void)
11579 if (targetm.cxx.cdtor_returns_this ())
11581 /* Any return from a constructor will end up here. */
11582 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11584 val = DECL_ARGUMENTS (current_function_decl);
11585 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11586 DECL_RESULT (current_function_decl), val);
11587 /* Return the address of the object. */
11588 exprstmt = build_stmt (RETURN_EXPR, val);
11589 add_stmt (exprstmt);
11593 /* Do all the processing for the beginning of a destructor; set up the
11594 vtable pointers and cleanups for bases and members. */
11597 begin_destructor_body (void)
11599 tree compound_stmt;
11601 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11602 issued an error message. We still want to try to process the
11603 body of the function, but initialize_vtbl_ptrs will crash if
11604 TYPE_BINFO is NULL. */
11605 if (COMPLETE_TYPE_P (current_class_type))
11607 compound_stmt = begin_compound_stmt (0);
11608 /* Make all virtual function table pointers in non-virtual base
11609 classes point to CURRENT_CLASS_TYPE's virtual function
11611 initialize_vtbl_ptrs (current_class_ptr);
11612 finish_compound_stmt (compound_stmt);
11614 /* And insert cleanups for our bases and members so that they
11615 will be properly destroyed if we throw. */
11616 push_base_cleanups ();
11620 /* At the end of every destructor we generate code to delete the object if
11621 necessary. Do that now. */
11624 finish_destructor_body (void)
11628 /* Any return from a destructor will end up here; that way all base
11629 and member cleanups will be run when the function returns. */
11630 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11632 /* In a virtual destructor, we must call delete. */
11633 if (DECL_VIRTUAL_P (current_function_decl))
11636 tree virtual_size = cxx_sizeof (current_class_type);
11640 At the point of definition of a virtual destructor (including
11641 an implicit definition), non-placement operator delete shall
11642 be looked up in the scope of the destructor's class and if
11643 found shall be accessible and unambiguous. */
11644 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11646 /*global_p=*/false,
11647 /*placement=*/NULL_TREE,
11648 /*alloc_fn=*/NULL_TREE);
11650 if_stmt = begin_if_stmt ();
11651 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11652 current_in_charge_parm,
11655 finish_expr_stmt (exprstmt);
11656 finish_then_clause (if_stmt);
11657 finish_if_stmt (if_stmt);
11660 if (targetm.cxx.cdtor_returns_this ())
11664 val = DECL_ARGUMENTS (current_function_decl);
11665 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11666 DECL_RESULT (current_function_decl), val);
11667 /* Return the address of the object. */
11668 exprstmt = build_stmt (RETURN_EXPR, val);
11669 add_stmt (exprstmt);
11673 /* Do the necessary processing for the beginning of a function body, which
11674 in this case includes member-initializers, but not the catch clauses of
11675 a function-try-block. Currently, this means opening a binding level
11676 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11679 begin_function_body (void)
11683 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11686 if (processing_template_decl)
11687 /* Do nothing now. */;
11689 /* Always keep the BLOCK node associated with the outermost pair of
11690 curly braces of a function. These are needed for correct
11691 operation of dwarfout.c. */
11692 keep_next_level (true);
11694 stmt = begin_compound_stmt (BCS_FN_BODY);
11696 if (processing_template_decl)
11697 /* Do nothing now. */;
11698 else if (DECL_DESTRUCTOR_P (current_function_decl))
11699 begin_destructor_body ();
11704 /* Do the processing for the end of a function body. Currently, this means
11705 closing out the cleanups for fully-constructed bases and members, and in
11706 the case of the destructor, deleting the object if desired. Again, this
11707 is only meaningful for [cd]tors, since they are the only functions where
11708 there is a significant distinction between the main body and any
11709 function catch clauses. Handling, say, main() return semantics here
11710 would be wrong, as flowing off the end of a function catch clause for
11711 main() would also need to return 0. */
11714 finish_function_body (tree compstmt)
11716 if (compstmt == NULL_TREE)
11719 /* Close the block. */
11720 finish_compound_stmt (compstmt);
11722 if (processing_template_decl)
11723 /* Do nothing now. */;
11724 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11725 finish_constructor_body ();
11726 else if (DECL_DESTRUCTOR_P (current_function_decl))
11727 finish_destructor_body ();
11730 /* Given a function, returns the BLOCK corresponding to the outermost level
11731 of curly braces, skipping the artificial block created for constructor
11735 outer_curly_brace_block (tree fndecl)
11737 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11738 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11739 /* Skip the artificial function body block. */
11740 block = BLOCK_SUBBLOCKS (block);
11744 /* Finish up a function declaration and compile that function
11745 all the way to assembler language output. The free the storage
11746 for the function definition.
11748 FLAGS is a bitwise or of the following values:
11750 We just finished processing the body of an in-class inline
11751 function definition. (This processing will have taken place
11752 after the class definition is complete.) */
11755 finish_function (int flags)
11757 tree fndecl = current_function_decl;
11758 tree fntype, ctype = NULL_TREE;
11759 int inclass_inline = (flags & 2) != 0;
11762 /* When we get some parse errors, we can end up without a
11763 current_function_decl, so cope. */
11764 if (fndecl == NULL_TREE)
11765 return error_mark_node;
11767 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11768 && DECL_VIRTUAL_P (fndecl)
11769 && !processing_template_decl)
11771 tree fnclass = DECL_CONTEXT (fndecl);
11772 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11773 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11776 nested = function_depth > 1;
11777 fntype = TREE_TYPE (fndecl);
11779 /* TREE_READONLY (fndecl) = 1;
11780 This caused &foo to be of type ptr-to-const-function
11781 which then got a warning when stored in a ptr-to-function variable. */
11783 gcc_assert (building_stmt_tree ());
11784 /* The current function is being defined, so its DECL_INITIAL should
11785 be set, and unless there's a multiple definition, it should be
11786 error_mark_node. */
11787 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11789 /* For a cloned function, we've already got all the code we need;
11790 there's no need to add any extra bits. */
11791 if (!DECL_CLONED_FUNCTION_P (fndecl))
11793 if (DECL_MAIN_P (current_function_decl))
11797 /* Make it so that `main' always returns 0 by default (or
11800 stmt = finish_return_stmt (integer_one_node);
11802 stmt = finish_return_stmt (integer_zero_node);
11804 /* Hack. We don't want the middle-end to warn that this
11805 return is unreachable, so put the statement on the
11808 location_t linezero = linemap_line_start (line_table, 0, 1);
11809 SET_EXPR_LOCATION (stmt, linezero);
11813 if (use_eh_spec_block (current_function_decl))
11814 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11815 (TREE_TYPE (current_function_decl)),
11816 current_eh_spec_block);
11819 /* If we're saving up tree structure, tie off the function now. */
11820 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11822 finish_fname_decls ();
11824 /* If this function can't throw any exceptions, remember that. */
11825 if (!processing_template_decl
11826 && !cp_function_chain->can_throw
11827 && !flag_non_call_exceptions
11828 && !DECL_REPLACEABLE_P (fndecl))
11829 TREE_NOTHROW (fndecl) = 1;
11831 /* This must come after expand_function_end because cleanups might
11832 have declarations (from inline functions) that need to go into
11833 this function's blocks. */
11835 /* If the current binding level isn't the outermost binding level
11836 for this function, either there is a bug, or we have experienced
11837 syntax errors and the statement tree is malformed. */
11838 if (current_binding_level->kind != sk_function_parms)
11840 /* Make sure we have already experienced errors. */
11841 gcc_assert (errorcount);
11843 /* Throw away the broken statement tree and extra binding
11845 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11847 while (current_binding_level->kind != sk_function_parms)
11849 if (current_binding_level->kind == sk_class)
11850 pop_nested_class ();
11852 poplevel (0, 0, 0);
11855 poplevel (1, 0, 1);
11857 /* Statements should always be full-expressions at the outermost set
11858 of curly braces for a function. */
11859 gcc_assert (stmts_are_full_exprs_p ());
11861 /* Set up the named return value optimization, if we can. Candidate
11862 variables are selected in check_return_expr. */
11863 if (current_function_return_value)
11865 tree r = current_function_return_value;
11868 if (r != error_mark_node
11869 /* This is only worth doing for fns that return in memory--and
11870 simpler, since we don't have to worry about promoted modes. */
11871 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11872 /* Only allow this for variables declared in the outer scope of
11873 the function so we know that their lifetime always ends with a
11874 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11875 we were to do this optimization in tree-ssa. */
11876 && (outer = outer_curly_brace_block (fndecl))
11877 && chain_member (r, BLOCK_VARS (outer)))
11878 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11880 current_function_return_value = NULL_TREE;
11883 /* Remember that we were in class scope. */
11884 if (current_class_name)
11885 ctype = current_class_type;
11887 /* Must mark the RESULT_DECL as being in this function. */
11888 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11890 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11891 to the FUNCTION_DECL node itself. */
11892 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11894 /* Save away current state, if appropriate. */
11895 if (!processing_template_decl)
11896 save_function_data (fndecl);
11898 /* Complain if there's just no return statement. */
11899 if (warn_return_type
11900 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11901 && !dependent_type_p (TREE_TYPE (fntype))
11902 && !current_function_returns_value && !current_function_returns_null
11903 /* Don't complain if we abort or throw. */
11904 && !current_function_returns_abnormally
11905 && !DECL_NAME (DECL_RESULT (fndecl))
11906 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11907 inline function, as we might never be compiled separately. */
11908 && (DECL_INLINE (fndecl) || processing_template_decl)
11909 /* Structor return values (if any) are set by the compiler. */
11910 && !DECL_CONSTRUCTOR_P (fndecl)
11911 && !DECL_DESTRUCTOR_P (fndecl))
11912 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11914 /* Store the end of the function, so that we get good line number
11915 info for the epilogue. */
11916 cfun->function_end_locus = input_location;
11918 /* Genericize before inlining. */
11919 if (!processing_template_decl)
11921 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11922 cp_genericize (fndecl);
11923 /* Clear out the bits we don't need. */
11924 f->x_current_class_ptr = NULL;
11925 f->x_current_class_ref = NULL;
11926 f->x_eh_spec_block = NULL;
11927 f->x_in_charge_parm = NULL;
11928 f->x_vtt_parm = NULL;
11929 f->x_return_value = NULL;
11930 f->bindings = NULL;
11931 f->extern_decl_map = NULL;
11933 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11934 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11936 /* Clear out the bits we don't need. */
11937 local_names = NULL;
11939 /* We're leaving the context of this function, so zap cfun. It's still in
11940 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11942 current_function_decl = NULL;
11944 /* If this is an in-class inline definition, we may have to pop the
11945 bindings for the template parameters that we added in
11946 maybe_begin_member_template_processing when start_function was
11948 if (inclass_inline)
11949 maybe_end_member_template_processing ();
11951 /* Leave the scope of the class. */
11953 pop_nested_class ();
11959 /* Let the error reporting routines know that we're outside a
11960 function. For a nested function, this value is used in
11961 cxx_pop_function_context and then reset via pop_function_context. */
11962 current_function_decl = NULL_TREE;
11967 /* Create the FUNCTION_DECL for a function definition.
11968 DECLSPECS and DECLARATOR are the parts of the declaration;
11969 they describe the return type and the name of the function,
11970 but twisted together in a fashion that parallels the syntax of C.
11972 This function creates a binding context for the function body
11973 as well as setting up the FUNCTION_DECL in current_function_decl.
11975 Returns a FUNCTION_DECL on success.
11977 If the DECLARATOR is not suitable for a function (it defines a datum
11978 instead), we return 0, which tells yyparse to report a parse error.
11980 May return void_type_node indicating that this method is actually
11981 a friend. See grokfield for more details.
11983 Came here with a `.pushlevel' .
11985 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11986 CHANGES TO CODE IN `grokfield'. */
11989 start_method (cp_decl_specifier_seq *declspecs,
11990 const cp_declarator *declarator, tree attrlist)
11992 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
11995 if (fndecl == error_mark_node)
11996 return error_mark_node;
11998 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12000 error ("invalid member function declaration");
12001 return error_mark_node;
12005 cplus_decl_attributes (&fndecl, attrlist, 0);
12007 /* Pass friends other than inline friend functions back. */
12008 if (fndecl == void_type_node)
12011 if (DECL_IN_AGGR_P (fndecl))
12013 if (DECL_CONTEXT (fndecl)
12014 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12015 error ("%qD is already defined in class %qT", fndecl,
12016 DECL_CONTEXT (fndecl));
12017 return error_mark_node;
12020 check_template_shadow (fndecl);
12022 DECL_DECLARED_INLINE_P (fndecl) = 1;
12023 if (flag_default_inline)
12024 DECL_INLINE (fndecl) = 1;
12026 /* We process method specializations in finish_struct_1. */
12027 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12029 fndecl = push_template_decl (fndecl);
12030 if (fndecl == error_mark_node)
12034 if (! DECL_FRIEND_P (fndecl))
12036 if (TREE_CHAIN (fndecl))
12038 fndecl = copy_node (fndecl);
12039 TREE_CHAIN (fndecl) = NULL_TREE;
12043 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12045 /* Make a place for the parms. */
12046 begin_scope (sk_function_parms, fndecl);
12048 DECL_IN_AGGR_P (fndecl) = 1;
12052 /* Go through the motions of finishing a function definition.
12053 We don't compile this method until after the whole class has
12056 FINISH_METHOD must return something that looks as though it
12057 came from GROKFIELD (since we are defining a method, after all).
12059 This is called after parsing the body of the function definition.
12060 STMTS is the chain of statements that makes up the function body.
12062 DECL is the ..._DECL that `start_method' provided. */
12065 finish_method (tree decl)
12067 tree fndecl = decl;
12072 if (decl == void_type_node)
12075 old_initial = DECL_INITIAL (fndecl);
12077 /* Undo the level for the parms (from start_method).
12078 This is like poplevel, but it causes nothing to be
12079 saved. Saving information here confuses symbol-table
12080 output routines. Besides, this information will
12081 be correctly output when this method is actually
12084 /* Clear out the meanings of the local variables of this level;
12085 also record in each decl which block it belongs to. */
12087 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12089 if (DECL_NAME (link) != NULL_TREE)
12090 pop_binding (DECL_NAME (link), link);
12091 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12092 DECL_CONTEXT (link) = NULL_TREE;
12095 poplevel (0, 0, 0);
12097 DECL_INITIAL (fndecl) = old_initial;
12099 /* We used to check if the context of FNDECL was different from
12100 current_class_type as another way to get inside here. This didn't work
12101 for String.cc in libg++. */
12102 if (DECL_FRIEND_P (fndecl))
12104 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12106 decl = void_type_node;
12113 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12114 we can lay it out later, when and if its type becomes complete. */
12117 maybe_register_incomplete_var (tree var)
12119 gcc_assert (TREE_CODE (var) == VAR_DECL);
12121 /* Keep track of variables with incomplete types. */
12122 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12123 && DECL_EXTERNAL (var))
12125 tree inner_type = TREE_TYPE (var);
12127 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12128 inner_type = TREE_TYPE (inner_type);
12129 inner_type = TYPE_MAIN_VARIANT (inner_type);
12131 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12132 /* RTTI TD entries are created while defining the type_info. */
12133 || (TYPE_LANG_SPECIFIC (inner_type)
12134 && TYPE_BEING_DEFINED (inner_type)))
12135 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12139 /* Called when a class type (given by TYPE) is defined. If there are
12140 any existing VAR_DECLs whose type hsa been completed by this
12141 declaration, update them now. */
12144 complete_vars (tree type)
12146 tree *list = &incomplete_vars;
12148 gcc_assert (CLASS_TYPE_P (type));
12151 if (same_type_p (type, TREE_PURPOSE (*list)))
12153 tree var = TREE_VALUE (*list);
12154 tree type = TREE_TYPE (var);
12155 /* Complete the type of the variable. The VAR_DECL itself
12156 will be laid out in expand_expr. */
12157 complete_type (type);
12158 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12159 /* Remove this entry from the list. */
12160 *list = TREE_CHAIN (*list);
12163 list = &TREE_CHAIN (*list);
12166 /* Check for pending declarations which may have abstract type. */
12167 complete_type_check_abstract (type);
12170 /* If DECL is of a type which needs a cleanup, build and return an
12171 expression to perform that cleanup here. Return NULL_TREE if no
12172 cleanup need be done. */
12175 cxx_maybe_build_cleanup (tree decl)
12181 /* Assume no cleanup is required. */
12182 cleanup = NULL_TREE;
12184 if (error_operand_p (decl))
12187 /* Handle "__attribute__((cleanup))". We run the cleanup function
12188 before the destructor since the destructor is what actually
12189 terminates the lifetime of the object. */
12190 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12197 /* Get the name specified by the user for the cleanup function. */
12198 id = TREE_VALUE (TREE_VALUE (attr));
12199 /* Look up the name to find the cleanup function to call. It is
12200 important to use lookup_name here because that is what is
12201 used in c-common.c:handle_cleanup_attribute when performing
12202 initial checks on the attribute. Note that those checks
12203 include ensuring that the function found is not an overloaded
12204 function, or an object with an overloaded call operator,
12205 etc.; we can rely on the fact that the functionfound is an
12206 ordinary FUNCTION_DECL. */
12207 fn = lookup_name (id);
12208 arg = build_address (decl);
12210 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
12213 /* Handle ordinary C++ destructors. */
12214 type = TREE_TYPE (decl);
12215 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12217 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12218 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12219 && CLASSTYPE_VBASECLASSES (type));
12223 if (TREE_CODE (type) == ARRAY_TYPE)
12226 addr = build_address (decl);
12228 /* Optimize for space over speed here. */
12229 if (!has_vbases || flag_expensive_optimizations)
12230 flags |= LOOKUP_NONVIRTUAL;
12232 call = build_delete (TREE_TYPE (addr), addr,
12233 sfk_complete_destructor, flags, 0);
12235 cleanup = build_compound_expr (cleanup, call);
12243 /* When a stmt has been parsed, this function is called. */
12250 /* DECL was originally constructed as a non-static member function,
12251 but turned out to be static. Update it accordingly. */
12254 revert_static_member_fn (tree decl)
12257 tree function = TREE_TYPE (decl);
12258 tree args = TYPE_ARG_TYPES (function);
12260 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12261 != TYPE_UNQUALIFIED)
12262 error ("static member function %q#D declared with type qualifiers", decl);
12264 args = TREE_CHAIN (args);
12265 tmp = build_function_type (TREE_TYPE (function), args);
12266 tmp = build_qualified_type (tmp, cp_type_quals (function));
12267 tmp = build_exception_variant (tmp,
12268 TYPE_RAISES_EXCEPTIONS (function));
12269 TREE_TYPE (decl) = tmp;
12270 if (DECL_ARGUMENTS (decl))
12271 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12272 DECL_STATIC_FUNCTION_P (decl) = 1;
12275 /* Initialize the variables used during compilation of a C++
12279 cxx_push_function_context (struct function * f)
12281 struct language_function *p = GGC_CNEW (struct language_function);
12284 /* Whenever we start a new function, we destroy temporaries in the
12286 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12292 if (DECL_SAVED_FUNCTION_DATA (fn))
12294 /* If we already parsed this function, and we're just expanding it
12295 now, restore saved state. */
12296 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
12298 /* We don't need the saved data anymore. Unless this is an inline
12299 function; we need the named return value info for
12300 declare_return_variable. */
12301 if (! DECL_INLINE (fn))
12302 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
12307 /* Free the language-specific parts of F, now that we've finished
12308 compiling the function. */
12311 cxx_pop_function_context (struct function * f)
12316 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12317 one of the language-independent trees. */
12319 enum cp_tree_node_structure_enum
12320 cp_tree_node_structure (union lang_tree_node * t)
12322 switch (TREE_CODE (&t->generic))
12324 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12325 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12326 case OVERLOAD: return TS_CP_OVERLOAD;
12327 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12328 case PTRMEM_CST: return TS_CP_PTRMEM;
12329 case BASELINK: return TS_CP_BASELINK;
12330 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12331 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12332 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12333 default: return TS_CP_GENERIC;
12337 /* Build the void_list_node (void_type_node having been created). */
12339 build_void_list_node (void)
12341 tree t = build_tree_list (NULL_TREE, void_type_node);
12346 cp_missing_noreturn_ok_p (tree decl)
12348 /* A missing noreturn is ok for the `main' function. */
12349 return DECL_MAIN_P (decl);
12352 /* Return the COMDAT group into which DECL should be placed. */
12355 cxx_comdat_group (tree decl)
12359 /* Virtual tables, construction virtual tables, and virtual table
12360 tables all go in a single COMDAT group, named after the primary
12362 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12363 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12364 /* For all other DECLs, the COMDAT group is the mangled name of the
12365 declaration itself. */
12368 while (DECL_THUNK_P (decl))
12370 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12371 into the same section as the target function. In that case
12372 we must return target's name. */
12373 tree target = THUNK_TARGET (decl);
12374 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12375 && DECL_SECTION_NAME (target) != NULL
12376 && DECL_ONE_ONLY (target))
12381 name = DECL_ASSEMBLER_NAME (decl);
12384 return IDENTIFIER_POINTER (name);
12387 #include "gt-cp-decl.h"