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. */
2152 remove_decl_from_map (newdecl);
2158 /* Return zero if the declaration NEWDECL is valid
2159 when the declaration OLDDECL (assumed to be for the same name)
2160 has already been seen.
2161 Otherwise return an error message format string with a %s
2162 where the identifier should go. */
2165 redeclaration_error_message (tree newdecl, tree olddecl)
2167 if (TREE_CODE (newdecl) == TYPE_DECL)
2169 /* Because C++ can put things into name space for free,
2170 constructs like "typedef struct foo { ... } foo"
2171 would look like an erroneous redeclaration. */
2172 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2175 return "redefinition of %q#D";
2177 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2179 /* If this is a pure function, its olddecl will actually be
2180 the original initialization to `0' (which we force to call
2181 abort()). Don't complain about redefinition in this case. */
2182 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2183 && DECL_INITIAL (olddecl) == NULL_TREE)
2186 /* If both functions come from different namespaces, this is not
2187 a redeclaration - this is a conflict with a used function. */
2188 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2189 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2190 && ! decls_match (olddecl, newdecl))
2191 return "%qD conflicts with used function";
2193 /* We'll complain about linkage mismatches in
2194 warn_extern_redeclared_static. */
2196 /* Defining the same name twice is no good. */
2197 if (DECL_INITIAL (olddecl) != NULL_TREE
2198 && DECL_INITIAL (newdecl) != NULL_TREE)
2200 if (DECL_NAME (olddecl) == NULL_TREE)
2201 return "%q#D not declared in class";
2202 else if (!GNU_INLINE_P (olddecl)
2203 || GNU_INLINE_P (newdecl))
2204 return "redefinition of %q#D";
2207 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2209 bool olda = GNU_INLINE_P (olddecl);
2210 bool newa = GNU_INLINE_P (newdecl);
2215 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2217 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2223 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2227 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2229 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2230 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2231 return "redefinition of %q#D";
2235 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2236 || (DECL_TEMPLATE_RESULT (newdecl)
2237 == DECL_TEMPLATE_RESULT (olddecl)))
2240 nt = DECL_TEMPLATE_RESULT (newdecl);
2241 if (DECL_TEMPLATE_INFO (nt))
2242 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2243 ot = DECL_TEMPLATE_RESULT (olddecl);
2244 if (DECL_TEMPLATE_INFO (ot))
2245 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2246 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2247 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2248 return "redefinition of %q#D";
2250 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2252 bool olda = GNU_INLINE_P (ot);
2253 bool newa = GNU_INLINE_P (nt);
2258 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2260 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2264 /* Core issue #226 (C++0x):
2266 If a friend function template declaration specifies a
2267 default template-argument, that declaration shall be a
2268 definition and shall be the only declaration of the
2269 function template in the translation unit. */
2270 if ((cxx_dialect != cxx98)
2271 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2272 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2273 /*is_primary=*/1, /*is_partial=*/0,
2274 /*is_friend_decl=*/2))
2275 return "redeclaration of friend %q#D may not have default template arguments";
2279 else if (TREE_CODE (newdecl) == VAR_DECL
2280 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2281 && (! DECL_LANG_SPECIFIC (olddecl)
2282 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2283 || DECL_THREAD_LOCAL_P (newdecl)))
2285 /* Only variables can be thread-local, and all declarations must
2286 agree on this property. */
2287 if (DECL_THREAD_LOCAL_P (newdecl))
2288 return "thread-local declaration of %q#D follows "
2289 "non-thread-local declaration";
2291 return "non-thread-local declaration of %q#D follows "
2292 "thread-local declaration";
2294 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2296 /* The objects have been declared at namespace scope. If either
2297 is a member of an anonymous union, then this is an invalid
2298 redeclaration. For example:
2304 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2305 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2306 return "redeclaration of %q#D";
2307 /* If at least one declaration is a reference, there is no
2308 conflict. For example:
2314 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2316 /* Reject two definitions. */
2317 return "redefinition of %q#D";
2321 /* Objects declared with block scope: */
2322 /* Reject two definitions, and reject a definition
2323 together with an external reference. */
2324 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2325 return "redeclaration of %q#D";
2330 /* Hash and equality functions for the named_label table. */
2333 named_label_entry_hash (const void *data)
2335 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2336 return DECL_UID (ent->label_decl);
2340 named_label_entry_eq (const void *a, const void *b)
2342 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2343 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2344 return ent_a->label_decl == ent_b->label_decl;
2347 /* Create a new label, named ID. */
2350 make_label_decl (tree id, int local_p)
2352 struct named_label_entry *ent;
2356 decl = build_decl (LABEL_DECL, id, void_type_node);
2358 DECL_CONTEXT (decl) = current_function_decl;
2359 DECL_MODE (decl) = VOIDmode;
2360 C_DECLARED_LABEL_FLAG (decl) = local_p;
2362 /* Say where one reference is to the label, for the sake of the
2363 error if it is not defined. */
2364 DECL_SOURCE_LOCATION (decl) = input_location;
2366 /* Record the fact that this identifier is bound to this label. */
2367 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2369 /* Create the label htab for the function on demand. */
2371 named_labels = htab_create_ggc (13, named_label_entry_hash,
2372 named_label_entry_eq, NULL);
2374 /* Record this label on the list of labels used in this function.
2375 We do this before calling make_label_decl so that we get the
2376 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2377 ent = GGC_CNEW (struct named_label_entry);
2378 ent->label_decl = decl;
2380 slot = htab_find_slot (named_labels, ent, INSERT);
2381 gcc_assert (*slot == NULL);
2387 /* Look for a label named ID in the current function. If one cannot
2388 be found, create one. (We keep track of used, but undefined,
2389 labels, and complain about them at the end of a function.) */
2392 lookup_label (tree id)
2396 timevar_push (TV_NAME_LOOKUP);
2397 /* You can't use labels at global scope. */
2398 if (current_function_decl == NULL_TREE)
2400 error ("label %qE referenced outside of any function", id);
2401 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2404 /* See if we've already got this label. */
2405 decl = IDENTIFIER_LABEL_VALUE (id);
2406 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2407 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2409 decl = make_label_decl (id, /*local_p=*/0);
2410 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2413 /* Declare a local label named ID. */
2416 declare_local_label (tree id)
2420 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2421 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2422 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2423 current_binding_level->shadowed_labels);
2424 current_binding_level->shadowed_labels = shadow;
2426 decl = make_label_decl (id, /*local_p=*/1);
2427 TREE_VALUE (shadow) = decl;
2432 /* Returns nonzero if it is ill-formed to jump past the declaration of
2433 DECL. Returns 2 if it's also a real problem. */
2436 decl_jump_unsafe (tree decl)
2438 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2439 || TREE_TYPE (decl) == error_mark_node)
2442 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2443 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2446 if (pod_type_p (TREE_TYPE (decl)))
2449 /* The POD stuff is just pedantry; why should it matter if the class
2450 contains a field of pointer to member type? */
2454 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2457 identify_goto (tree decl, const location_t *locus)
2460 pedwarn ("jump to label %qD", decl);
2462 pedwarn ("jump to case label");
2464 pedwarn ("%H from here", locus);
2467 /* Check that a single previously seen jump to a newly defined label
2468 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2469 the jump context; NAMES are the names in scope in LEVEL at the jump
2470 context; LOCUS is the source position of the jump or 0. Returns
2471 true if all is well. */
2474 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2475 bool exited_omp, const location_t *locus)
2477 struct cp_binding_level *b;
2478 bool identified = false, saw_eh = false, saw_omp = false;
2482 identify_goto (decl, locus);
2483 error (" exits OpenMP structured block");
2484 identified = saw_omp = true;
2487 for (b = current_binding_level; b ; b = b->level_chain)
2489 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2491 for (new_decls = b->names; new_decls != old_decls;
2492 new_decls = TREE_CHAIN (new_decls))
2494 int problem = decl_jump_unsafe (new_decls);
2500 identify_goto (decl, locus);
2504 error (" crosses initialization of %q+#D", new_decls);
2506 pedwarn (" enters scope of non-POD %q+#D", new_decls);
2511 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2515 identify_goto (decl, locus);
2518 if (b->kind == sk_try)
2519 error (" enters try block");
2521 error (" enters catch block");
2524 if (b->kind == sk_omp && !saw_omp)
2528 identify_goto (decl, locus);
2531 error (" enters OpenMP structured block");
2540 check_previous_goto (tree decl, struct named_label_use_entry *use)
2542 check_previous_goto_1 (decl, use->binding_level,
2543 use->names_in_scope, use->in_omp_scope,
2544 &use->o_goto_locus);
2548 check_switch_goto (struct cp_binding_level* level)
2550 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2553 /* Check that a new jump to a label DECL is OK. Called by
2554 finish_goto_stmt. */
2557 check_goto (tree decl)
2559 struct named_label_entry *ent, dummy;
2560 bool saw_catch = false, identified = false;
2563 /* We can't know where a computed goto is jumping.
2564 So we assume that it's OK. */
2565 if (TREE_CODE (decl) != LABEL_DECL)
2568 /* We didn't record any information about this label when we created it,
2569 and there's not much point since it's trivial to analyze as a return. */
2570 if (decl == cdtor_label)
2573 dummy.label_decl = decl;
2574 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2575 gcc_assert (ent != NULL);
2577 /* If the label hasn't been defined yet, defer checking. */
2578 if (! DECL_INITIAL (decl))
2580 struct named_label_use_entry *new_use;
2582 /* Don't bother creating another use if the last goto had the
2583 same data, and will therefore create the same set of errors. */
2585 && ent->uses->names_in_scope == current_binding_level->names)
2588 new_use = GGC_NEW (struct named_label_use_entry);
2589 new_use->binding_level = current_binding_level;
2590 new_use->names_in_scope = current_binding_level->names;
2591 new_use->o_goto_locus = input_location;
2592 new_use->in_omp_scope = false;
2594 new_use->next = ent->uses;
2595 ent->uses = new_use;
2599 if (ent->in_try_scope || ent->in_catch_scope
2600 || ent->in_omp_scope || ent->bad_decls)
2602 pedwarn ("jump to label %q+D", decl);
2603 pedwarn (" from here");
2607 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2609 tree b = TREE_VALUE (bad);
2610 int u = decl_jump_unsafe (b);
2612 if (u > 1 && DECL_ARTIFICIAL (b))
2614 /* Can't skip init of __exception_info. */
2615 error ("%J enters catch block", b);
2619 error (" skips initialization of %q+#D", b);
2621 pedwarn (" enters scope of non-POD %q+#D", b);
2624 if (ent->in_try_scope)
2625 error (" enters try block");
2626 else if (ent->in_catch_scope && !saw_catch)
2627 error (" enters catch block");
2629 if (ent->in_omp_scope)
2630 error (" enters OpenMP structured block");
2631 else if (flag_openmp)
2633 struct cp_binding_level *b;
2634 for (b = current_binding_level; b ; b = b->level_chain)
2636 if (b == ent->binding_level)
2638 if (b->kind == sk_omp)
2642 pedwarn ("jump to label %q+D", decl);
2643 pedwarn (" from here");
2646 error (" exits OpenMP structured block");
2653 /* Check that a return is ok wrt OpenMP structured blocks.
2654 Called by finish_return_stmt. Returns true if all is well. */
2657 check_omp_return (void)
2659 struct cp_binding_level *b;
2660 for (b = current_binding_level; b ; b = b->level_chain)
2661 if (b->kind == sk_omp)
2663 error ("invalid exit from OpenMP structured block");
2669 /* Define a label, specifying the location in the source file.
2670 Return the LABEL_DECL node for the label. */
2673 define_label (location_t location, tree name)
2675 struct named_label_entry *ent, dummy;
2676 struct cp_binding_level *p;
2679 timevar_push (TV_NAME_LOOKUP);
2681 decl = lookup_label (name);
2683 dummy.label_decl = decl;
2684 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2685 gcc_assert (ent != NULL);
2687 /* After labels, make any new cleanups in the function go into their
2688 own new (temporary) binding contour. */
2689 for (p = current_binding_level;
2690 p->kind != sk_function_parms;
2692 p->more_cleanups_ok = 0;
2694 if (name == get_identifier ("wchar_t"))
2695 pedwarn ("label named wchar_t");
2697 if (DECL_INITIAL (decl) != NULL_TREE)
2699 error ("duplicate label %qD", decl);
2700 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2704 struct named_label_use_entry *use;
2706 /* Mark label as having been defined. */
2707 DECL_INITIAL (decl) = error_mark_node;
2708 /* Say where in the source. */
2709 DECL_SOURCE_LOCATION (decl) = location;
2711 ent->binding_level = current_binding_level;
2712 ent->names_in_scope = current_binding_level->names;
2714 for (use = ent->uses; use ; use = use->next)
2715 check_previous_goto (decl, use);
2719 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2724 struct cp_binding_level *level;
2725 struct cp_switch *next;
2726 /* The SWITCH_STMT being built. */
2728 /* A splay-tree mapping the low element of a case range to the high
2729 element, or NULL_TREE if there is no high element. Used to
2730 determine whether or not a new case label duplicates an old case
2731 label. We need a tree, rather than simply a hash table, because
2732 of the GNU case range extension. */
2736 /* A stack of the currently active switch statements. The innermost
2737 switch statement is on the top of the stack. There is no need to
2738 mark the stack for garbage collection because it is only active
2739 during the processing of the body of a function, and we never
2740 collect at that point. */
2742 static struct cp_switch *switch_stack;
2744 /* Called right after a switch-statement condition is parsed.
2745 SWITCH_STMT is the switch statement being parsed. */
2748 push_switch (tree switch_stmt)
2750 struct cp_switch *p = XNEW (struct cp_switch);
2751 p->level = current_binding_level;
2752 p->next = switch_stack;
2753 p->switch_stmt = switch_stmt;
2754 p->cases = splay_tree_new (case_compare, NULL, NULL);
2761 struct cp_switch *cs = switch_stack;
2762 location_t switch_location;
2764 /* Emit warnings as needed. */
2765 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2766 switch_location = EXPR_LOCATION (cs->switch_stmt);
2768 switch_location = input_location;
2769 if (!processing_template_decl)
2770 c_do_switch_warnings (cs->cases, switch_location,
2771 SWITCH_STMT_TYPE (cs->switch_stmt),
2772 SWITCH_STMT_COND (cs->switch_stmt));
2774 splay_tree_delete (cs->cases);
2775 switch_stack = switch_stack->next;
2779 /* Note that we've seen a definition of a case label, and complain if this
2780 is a bad place for one. */
2783 finish_case_label (tree low_value, tree high_value)
2786 struct cp_binding_level *p;
2788 if (processing_template_decl)
2792 /* For templates, just add the case label; we'll do semantic
2793 analysis at instantiation-time. */
2794 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2795 return add_stmt (build_case_label (low_value, high_value, label));
2798 /* Find the condition on which this switch statement depends. */
2799 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2800 if (cond && TREE_CODE (cond) == TREE_LIST)
2801 cond = TREE_VALUE (cond);
2803 if (!check_switch_goto (switch_stack->level))
2804 return error_mark_node;
2806 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2807 low_value, high_value);
2809 /* After labels, make any new cleanups in the function go into their
2810 own new (temporary) binding contour. */
2811 for (p = current_binding_level;
2812 p->kind != sk_function_parms;
2814 p->more_cleanups_ok = 0;
2819 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2822 typename_hash (const void* k)
2825 const_tree const t = (const_tree) k;
2827 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2828 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2833 typedef struct typename_info {
2841 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2842 really of type `typename_info*' */
2845 typename_compare (const void * k1, const void * k2)
2847 const_tree const t1 = (const_tree) k1;
2848 const typename_info *const t2 = (const typename_info *) k2;
2850 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2851 && TYPE_CONTEXT (t1) == t2->scope
2852 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2853 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2854 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2857 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2858 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2860 Returns the new TYPENAME_TYPE. */
2862 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2865 build_typename_type (tree context, tree name, tree fullname,
2866 enum tag_types tag_type)
2874 if (typename_htab == NULL)
2875 typename_htab = htab_create_ggc (61, &typename_hash,
2876 &typename_compare, NULL);
2878 ti.scope = FROB_CONTEXT (context);
2880 ti.template_id = fullname;
2881 ti.enum_p = tag_type == enum_type;
2882 ti.class_p = (tag_type == class_type
2883 || tag_type == record_type
2884 || tag_type == union_type);
2885 hash = (htab_hash_pointer (ti.scope)
2886 ^ htab_hash_pointer (ti.name));
2888 /* See if we already have this type. */
2889 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2894 /* Build the TYPENAME_TYPE. */
2895 t = make_aggr_type (TYPENAME_TYPE);
2896 TYPE_CONTEXT (t) = ti.scope;
2897 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2898 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2899 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2901 /* Build the corresponding TYPE_DECL. */
2902 d = build_decl (TYPE_DECL, name, t);
2903 TYPE_NAME (TREE_TYPE (d)) = d;
2904 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2905 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2906 DECL_ARTIFICIAL (d) = 1;
2908 /* Store it in the hash table. */
2911 /* TYPENAME_TYPEs must always be compared structurally, because
2912 they may or may not resolve down to another type depending on
2913 the currently open classes. */
2914 SET_TYPE_STRUCTURAL_EQUALITY (t);
2920 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2921 provided to name the type. Returns an appropriate type, unless an
2922 error occurs, in which case error_mark_node is returned. If we
2923 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2924 return that, rather than the _TYPE it corresponds to, in other
2925 cases we look through the type decl. If TF_ERROR is set, complain
2926 about errors, otherwise be quiet. */
2929 make_typename_type (tree context, tree name, enum tag_types tag_type,
2930 tsubst_flags_t complain)
2936 if (name == error_mark_node
2937 || context == NULL_TREE
2938 || context == error_mark_node)
2939 return error_mark_node;
2943 if (!(TYPE_LANG_SPECIFIC (name)
2944 && (CLASSTYPE_IS_TEMPLATE (name)
2945 || CLASSTYPE_USE_TEMPLATE (name))))
2946 name = TYPE_IDENTIFIER (name);
2948 /* Create a TEMPLATE_ID_EXPR for the type. */
2949 name = build_nt (TEMPLATE_ID_EXPR,
2950 CLASSTYPE_TI_TEMPLATE (name),
2951 CLASSTYPE_TI_ARGS (name));
2953 else if (TREE_CODE (name) == TYPE_DECL)
2954 name = DECL_NAME (name);
2958 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2960 name = TREE_OPERAND (name, 0);
2961 if (TREE_CODE (name) == TEMPLATE_DECL)
2962 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2963 else if (TREE_CODE (name) == OVERLOAD)
2965 error ("%qD is not a type", name);
2966 return error_mark_node;
2969 if (TREE_CODE (name) == TEMPLATE_DECL)
2971 error ("%qD used without template parameters", name);
2972 return error_mark_node;
2974 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2975 gcc_assert (TYPE_P (context));
2977 /* When the CONTEXT is a dependent type, NAME could refer to a
2978 dependent base class of CONTEXT. So we cannot peek inside it,
2979 even if CONTEXT is a currently open scope. */
2980 if (dependent_type_p (context))
2981 return build_typename_type (context, name, fullname, tag_type);
2983 if (!IS_AGGR_TYPE (context))
2985 if (complain & tf_error)
2986 error ("%q#T is not a class", context);
2987 return error_mark_node;
2990 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2992 /* We should only set WANT_TYPE when we're a nested typename type.
2993 Then we can give better diagnostics if we find a non-type. */
2994 t = lookup_field (context, name, 0, /*want_type=*/true);
2997 if (complain & tf_error)
2998 error (want_template ? "no class template named %q#T in %q#T"
2999 : "no type named %q#T in %q#T", name, context);
3000 return error_mark_node;
3003 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3005 if (complain & tf_error)
3006 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3008 return error_mark_node;
3010 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3012 if (complain & tf_error)
3013 error ("%<typename %T::%D%> names %q#T, which is not a type",
3015 return error_mark_node;
3018 if (complain & tf_error)
3019 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3022 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3024 /*entering_scope=*/0,
3025 tf_warning_or_error | tf_user);
3027 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3033 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3034 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3035 in which case error_mark_node is returned.
3037 If PARM_LIST is non-NULL, also make sure that the template parameter
3038 list of TEMPLATE_DECL matches.
3040 If COMPLAIN zero, don't complain about any errors that occur. */
3043 make_unbound_class_template (tree context, tree name, tree parm_list,
3044 tsubst_flags_t complain)
3050 name = TYPE_IDENTIFIER (name);
3051 else if (DECL_P (name))
3052 name = DECL_NAME (name);
3053 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3055 if (!dependent_type_p (context)
3056 || currently_open_class (context))
3058 tree tmpl = NULL_TREE;
3060 if (IS_AGGR_TYPE (context))
3061 tmpl = lookup_field (context, name, 0, false);
3063 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3065 if (complain & tf_error)
3066 error ("no class template named %q#T in %q#T", name, context);
3067 return error_mark_node;
3071 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3073 if (complain & tf_error)
3075 error ("template parameters do not match template");
3076 error ("%q+D declared here", tmpl);
3078 return error_mark_node;
3081 if (complain & tf_error)
3082 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3087 /* Build the UNBOUND_CLASS_TEMPLATE. */
3088 t = make_aggr_type (UNBOUND_CLASS_TEMPLATE);
3089 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3090 TREE_TYPE (t) = NULL_TREE;
3091 SET_TYPE_STRUCTURAL_EQUALITY (t);
3093 /* Build the corresponding TEMPLATE_DECL. */
3094 d = build_decl (TEMPLATE_DECL, name, t);
3095 TYPE_NAME (TREE_TYPE (d)) = d;
3096 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3097 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3098 DECL_ARTIFICIAL (d) = 1;
3099 DECL_TEMPLATE_PARMS (d) = parm_list;
3106 /* Push the declarations of builtin types into the namespace.
3107 RID_INDEX is the index of the builtin type in the array
3108 RID_POINTERS. NAME is the name used when looking up the builtin
3109 type. TYPE is the _TYPE node for the builtin type. */
3112 record_builtin_type (enum rid rid_index,
3116 tree rname = NULL_TREE, tname = NULL_TREE;
3117 tree tdecl = NULL_TREE;
3119 if ((int) rid_index < (int) RID_MAX)
3120 rname = ridpointers[(int) rid_index];
3122 tname = get_identifier (name);
3124 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3125 eliminated. Built-in types should not be looked up name; their
3126 names are keywords that the parser can recognize. However, there
3127 is code in c-common.c that uses identifier_global_value to look
3128 up built-in types by name. */
3131 tdecl = build_decl (TYPE_DECL, tname, type);
3132 DECL_ARTIFICIAL (tdecl) = 1;
3133 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3139 tdecl = build_decl (TYPE_DECL, rname, type);
3140 DECL_ARTIFICIAL (tdecl) = 1;
3142 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3145 if (!TYPE_NAME (type))
3146 TYPE_NAME (type) = tdecl;
3149 debug_hooks->type_decl (tdecl, 0);
3152 /* Record one of the standard Java types.
3153 * Declare it as having the given NAME.
3154 * If SIZE > 0, it is the size of one of the integral types;
3155 * otherwise it is the negative of the size of one of the other types. */
3158 record_builtin_java_type (const char* name, int size)
3162 type = make_signed_type (size);
3163 else if (size == -1)
3164 { /* "__java_boolean". */
3165 if ((TYPE_MODE (boolean_type_node)
3166 == smallest_mode_for_size (1, MODE_INT)))
3167 type = build_variant_type_copy (boolean_type_node);
3169 /* ppc-darwin has SImode bool, make jboolean a 1-bit
3170 integer type without boolean semantics there. */
3171 type = make_unsigned_type (1);
3173 else if (size > -32)
3174 { /* "__java_char". */
3175 type = make_unsigned_type (-size);
3178 { /* "__java_float" or ""__java_double". */
3179 type = make_node (REAL_TYPE);
3180 TYPE_PRECISION (type) = - size;
3183 record_builtin_type (RID_MAX, name, type);
3184 decl = TYPE_NAME (type);
3186 /* Suppress generate debug symbol entries for these types,
3187 since for normal C++ they are just clutter.
3188 However, push_lang_context undoes this if extern "Java" is seen. */
3189 DECL_IGNORED_P (decl) = 1;
3191 TYPE_FOR_JAVA (type) = 1;
3195 /* Push a type into the namespace so that the back ends ignore it. */
3198 record_unknown_type (tree type, const char* name)
3200 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3201 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3202 DECL_IGNORED_P (decl) = 1;
3203 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3204 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3205 TYPE_ALIGN (type) = 1;
3206 TYPE_USER_ALIGN (type) = 0;
3207 TYPE_MODE (type) = TYPE_MODE (void_type_node);
3210 /* A string for which we should create an IDENTIFIER_NODE at
3213 typedef struct predefined_identifier
3215 /* The name of the identifier. */
3216 const char *const name;
3217 /* The place where the IDENTIFIER_NODE should be stored. */
3219 /* Nonzero if this is the name of a constructor or destructor. */
3220 const int ctor_or_dtor_p;
3221 } predefined_identifier;
3223 /* Create all the predefined identifiers. */
3226 initialize_predefined_identifiers (void)
3228 const predefined_identifier *pid;
3230 /* A table of identifiers to create at startup. */
3231 static const predefined_identifier predefined_identifiers[] = {
3232 { "C++", &lang_name_cplusplus, 0 },
3233 { "C", &lang_name_c, 0 },
3234 { "Java", &lang_name_java, 0 },
3235 /* Some of these names have a trailing space so that it is
3236 impossible for them to conflict with names written by users. */
3237 { "__ct ", &ctor_identifier, 1 },
3238 { "__base_ctor ", &base_ctor_identifier, 1 },
3239 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3240 { "__dt ", &dtor_identifier, 1 },
3241 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3242 { "__base_dtor ", &base_dtor_identifier, 1 },
3243 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3244 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3245 { "nelts", &nelts_identifier, 0 },
3246 { THIS_NAME, &this_identifier, 0 },
3247 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3248 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3249 { "_vptr", &vptr_identifier, 0 },
3250 { "__vtt_parm", &vtt_parm_identifier, 0 },
3251 { "::", &global_scope_name, 0 },
3252 { "std", &std_identifier, 0 },
3256 for (pid = predefined_identifiers; pid->name; ++pid)
3258 *pid->node = get_identifier (pid->name);
3259 if (pid->ctor_or_dtor_p)
3260 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3264 /* Create the predefined scalar types of C,
3265 and some nodes representing standard constants (0, 1, (void *)0).
3266 Initialize the global binding level.
3267 Make definitions for built-in primitive functions. */
3270 cxx_init_decl_processing (void)
3273 tree void_ftype_ptr;
3275 build_common_tree_nodes (flag_signed_char, false);
3277 /* Create all the identifiers we need. */
3278 initialize_predefined_identifiers ();
3280 /* Create the global variables. */
3281 push_to_top_level ();
3283 current_function_decl = NULL_TREE;
3284 current_binding_level = NULL;
3285 /* Enter the global namespace. */
3286 gcc_assert (global_namespace == NULL_TREE);
3287 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3289 TREE_PUBLIC (global_namespace) = 1;
3290 begin_scope (sk_namespace, global_namespace);
3292 current_lang_name = NULL_TREE;
3294 if (flag_visibility_ms_compat)
3295 default_visibility = VISIBILITY_HIDDEN;
3298 current_lang_name = lang_name_c;
3300 /* Create the `std' namespace. */
3301 push_namespace (std_identifier);
3302 std_node = current_namespace;
3305 c_common_nodes_and_builtins ();
3307 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3308 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3309 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3310 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3311 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3312 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3313 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3314 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3316 integer_two_node = build_int_cst (NULL_TREE, 2);
3317 integer_three_node = build_int_cst (NULL_TREE, 3);
3319 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3320 truthvalue_type_node = boolean_type_node;
3321 truthvalue_false_node = boolean_false_node;
3322 truthvalue_true_node = boolean_true_node;
3324 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3327 record_builtin_type (RID_MAX, NULL, string_type_node);
3330 delta_type_node = ptrdiff_type_node;
3331 vtable_index_type = ptrdiff_type_node;
3333 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3334 void_ftype = build_function_type (void_type_node, void_list_node);
3335 void_ftype_ptr = build_function_type (void_type_node,
3336 tree_cons (NULL_TREE,
3340 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3342 /* C++ extensions */
3344 unknown_type_node = make_node (UNKNOWN_TYPE);
3345 record_unknown_type (unknown_type_node, "unknown type");
3347 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3348 TREE_TYPE (unknown_type_node) = unknown_type_node;
3350 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3352 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3353 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3356 /* Make sure we get a unique function type, so we can give
3357 its pointer type a name. (This wins for gdb.) */
3358 tree vfunc_type = make_node (FUNCTION_TYPE);
3359 TREE_TYPE (vfunc_type) = integer_type_node;
3360 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3361 layout_type (vfunc_type);
3363 vtable_entry_type = build_pointer_type (vfunc_type);
3365 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3368 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3369 layout_type (vtbl_type_node);
3370 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3371 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3372 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3373 layout_type (vtbl_ptr_type_node);
3374 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3376 push_namespace (get_identifier ("__cxxabiv1"));
3377 abi_node = current_namespace;
3380 global_type_node = make_node (LANG_TYPE);
3381 record_unknown_type (global_type_node, "global type");
3384 current_lang_name = lang_name_cplusplus;
3388 tree bad_alloc_type_node;
3389 tree bad_alloc_decl;
3390 tree newtype, deltype;
3391 tree ptr_ftype_sizetype;
3393 push_namespace (std_identifier);
3394 bad_alloc_id = get_identifier ("bad_alloc");
3395 bad_alloc_type_node = make_aggr_type (RECORD_TYPE);
3396 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3398 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3399 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3400 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3404 = build_function_type (ptr_type_node,
3405 tree_cons (NULL_TREE,
3408 newtype = build_exception_variant
3409 (ptr_ftype_sizetype, add_exception_specifier
3410 (NULL_TREE, bad_alloc_type_node, -1));
3411 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3412 push_cp_library_fn (NEW_EXPR, newtype);
3413 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3414 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3415 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3419 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3421 /* Perform other language dependent initializations. */
3422 init_class_processing ();
3423 init_rtti_processing ();
3425 if (flag_exceptions)
3426 init_exception_processing ();
3428 if (! supports_one_only ())
3431 make_fname_decl = cp_make_fname_decl;
3432 start_fname_decls ();
3434 /* Show we use EH for cleanups. */
3435 if (flag_exceptions)
3436 using_eh_for_cleanups ();
3439 /* Generate an initializer for a function naming variable from
3440 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3441 filled in with the type of the init. */
3444 cp_fname_init (const char* name, tree *type_p)
3446 tree domain = NULL_TREE;
3448 tree init = NULL_TREE;
3453 length = strlen (name);
3454 domain = build_index_type (size_int (length));
3455 init = build_string (length + 1, name);
3458 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3459 type = build_cplus_array_type (type, domain);
3464 TREE_TYPE (init) = type;
3466 init = error_mark_node;
3471 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3472 decl, NAME is the initialization string and TYPE_DEP indicates whether
3473 NAME depended on the type of the function. We make use of that to detect
3474 __PRETTY_FUNCTION__ inside a template fn. This is being done
3475 lazily at the point of first use, so we mustn't push the decl now. */
3478 cp_make_fname_decl (tree id, int type_dep)
3480 const char *const name = (type_dep && processing_template_decl
3481 ? NULL : fname_as_string (type_dep));
3483 tree init = cp_fname_init (name, &type);
3484 tree decl = build_decl (VAR_DECL, id, type);
3487 free (CONST_CAST (char *, name));
3489 /* As we're using pushdecl_with_scope, we must set the context. */
3490 DECL_CONTEXT (decl) = current_function_decl;
3491 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3493 TREE_STATIC (decl) = 1;
3494 TREE_READONLY (decl) = 1;
3495 DECL_ARTIFICIAL (decl) = 1;
3497 TREE_USED (decl) = 1;
3499 if (current_function_decl)
3501 struct cp_binding_level *b = current_binding_level;
3502 while (b->level_chain->kind != sk_function_parms)
3504 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3505 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3506 LOOKUP_ONLYCONVERTING);
3509 pushdecl_top_level_and_finish (decl, init);
3515 builtin_function_1 (tree decl, tree context)
3517 tree id = DECL_NAME (decl);
3518 const char *name = IDENTIFIER_POINTER (id);
3520 retrofit_lang_decl (decl);
3522 /* All nesting of C++ functions is lexical; there is never a "static
3523 chain" in the sense of GNU C nested functions. */
3524 DECL_NO_STATIC_CHAIN (decl) = 1;
3526 DECL_ARTIFICIAL (decl) = 1;
3527 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3528 SET_DECL_LANGUAGE (decl, lang_c);
3529 /* Runtime library routines are, by definition, available in an
3530 external shared object. */
3531 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3532 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3534 DECL_CONTEXT (decl) = context;
3538 /* A function in the user's namespace should have an explicit
3539 declaration before it is used. Mark the built-in function as
3540 anticipated but not actually declared. */
3541 if (name[0] != '_' || name[1] != '_')
3542 DECL_ANTICIPATED (decl) = 1;
3543 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3545 size_t len = strlen (name);
3547 /* Treat __*_chk fortification functions as anticipated as well,
3548 unless they are __builtin_*. */
3549 if (len > strlen ("___chk")
3550 && memcmp (name + len - strlen ("_chk"),
3551 "_chk", strlen ("_chk") + 1) == 0)
3552 DECL_ANTICIPATED (decl) = 1;
3559 cxx_builtin_function (tree decl)
3561 tree id = DECL_NAME (decl);
3562 const char *name = IDENTIFIER_POINTER (id);
3563 /* All builtins that don't begin with an '_' should additionally
3564 go in the 'std' namespace. */
3567 tree decl2 = copy_node(decl);
3568 push_namespace (std_identifier);
3569 builtin_function_1 (decl2, std_node);
3573 return builtin_function_1 (decl, NULL_TREE);
3576 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3577 function. Not called directly. */
3580 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3582 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3583 DECL_EXTERNAL (fn) = 1;
3584 TREE_PUBLIC (fn) = 1;
3585 DECL_ARTIFICIAL (fn) = 1;
3586 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3587 SET_DECL_LANGUAGE (fn, lang_c);
3588 /* Runtime library routines are, by definition, available in an
3589 external shared object. */
3590 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3591 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3595 /* Returns the _DECL for a library function with C linkage.
3596 We assume that such functions never throw; if this is incorrect,
3597 callers should unset TREE_NOTHROW. */
3600 build_library_fn (tree name, tree type)
3602 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3603 TREE_NOTHROW (fn) = 1;
3607 /* Returns the _DECL for a library function with C++ linkage. */
3610 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3612 tree fn = build_library_fn_1 (name, operator_code, type);
3613 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3614 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3615 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3619 /* Like build_library_fn, but takes a C string instead of an
3623 build_library_fn_ptr (const char* name, tree type)
3625 return build_library_fn (get_identifier (name), type);
3628 /* Like build_cp_library_fn, but takes a C string instead of an
3632 build_cp_library_fn_ptr (const char* name, tree type)
3634 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3637 /* Like build_library_fn, but also pushes the function so that we will
3638 be able to find it via IDENTIFIER_GLOBAL_VALUE. */
3641 push_library_fn (tree name, tree type)
3643 tree fn = build_library_fn (name, type);
3644 pushdecl_top_level (fn);
3648 /* Like build_cp_library_fn, but also pushes the function so that it
3649 will be found by normal lookup. */
3652 push_cp_library_fn (enum tree_code operator_code, tree type)
3654 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3661 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3665 push_void_library_fn (tree name, tree parmtypes)
3667 tree type = build_function_type (void_type_node, parmtypes);
3668 return push_library_fn (name, type);
3671 /* Like push_library_fn, but also note that this function throws
3672 and does not return. Used for __throw_foo and the like. */
3675 push_throw_library_fn (tree name, tree type)
3677 tree fn = push_library_fn (name, type);
3678 TREE_THIS_VOLATILE (fn) = 1;
3679 TREE_NOTHROW (fn) = 0;
3683 /* When we call finish_struct for an anonymous union, we create
3684 default copy constructors and such. But, an anonymous union
3685 shouldn't have such things; this function undoes the damage to the
3686 anonymous union type T.
3688 (The reason that we create the synthesized methods is that we don't
3689 distinguish `union { int i; }' from `typedef union { int i; } U'.
3690 The first is an anonymous union; the second is just an ordinary
3694 fixup_anonymous_aggr (tree t)
3698 /* Wipe out memory of synthesized methods. */
3699 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3700 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3701 TYPE_HAS_INIT_REF (t) = 0;
3702 TYPE_HAS_CONST_INIT_REF (t) = 0;
3703 TYPE_HAS_ASSIGN_REF (t) = 0;
3704 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3706 /* Splice the implicitly generated functions out of the TYPE_METHODS
3708 q = &TYPE_METHODS (t);
3711 if (DECL_ARTIFICIAL (*q))
3712 *q = TREE_CHAIN (*q);
3714 q = &TREE_CHAIN (*q);
3717 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3718 if (TYPE_METHODS (t))
3720 tree decl = TYPE_MAIN_DECL (t);
3722 if (TREE_CODE (t) != UNION_TYPE)
3723 error ("%Jan anonymous struct cannot have function members", decl);
3725 error ("%Jan anonymous union cannot have function members", decl);
3728 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3729 assignment operators (because they cannot have these methods themselves).
3730 For anonymous unions this is already checked because they are not allowed
3731 in any union, otherwise we have to check it. */
3732 if (TREE_CODE (t) != UNION_TYPE)
3736 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3737 if (TREE_CODE (field) == FIELD_DECL)
3739 type = TREE_TYPE (field);
3740 if (CLASS_TYPE_P (type))
3742 if (TYPE_NEEDS_CONSTRUCTING (type))
3743 error ("member %q+#D with constructor not allowed "
3744 "in anonymous aggregate", field);
3745 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3746 error ("member %q+#D with destructor not allowed "
3747 "in anonymous aggregate", field);
3748 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3749 error ("member %q+#D with copy assignment operator "
3750 "not allowed in anonymous aggregate", field);
3756 /* Make sure that a declaration with no declarator is well-formed, i.e.
3757 just declares a tagged type or anonymous union.
3759 Returns the type declared; or NULL_TREE if none. */
3762 check_tag_decl (cp_decl_specifier_seq *declspecs)
3764 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3765 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3766 /* If a class, struct, or enum type is declared by the DECLSPECS
3767 (i.e, if a class-specifier, enum-specifier, or non-typename
3768 elaborated-type-specifier appears in the DECLSPECS),
3769 DECLARED_TYPE is set to the corresponding type. */
3770 tree declared_type = NULL_TREE;
3771 bool error_p = false;
3773 if (declspecs->multiple_types_p)
3774 error ("multiple types in one declaration");
3775 else if (declspecs->redefined_builtin_type)
3777 if (!in_system_header)
3778 pedwarn ("redeclaration of C++ built-in type %qT",
3779 declspecs->redefined_builtin_type);
3784 && TYPE_P (declspecs->type)
3785 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3786 && IS_AGGR_TYPE (declspecs->type))
3787 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3788 declared_type = declspecs->type;
3789 else if (declspecs->type == error_mark_node)
3791 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3792 pedwarn ("declaration does not declare anything");
3793 /* Check for an anonymous union. */
3794 else if (declared_type && IS_AGGR_TYPE_CODE (TREE_CODE (declared_type))
3795 && TYPE_ANONYMOUS_P (declared_type))
3797 /* 7/3 In a simple-declaration, the optional init-declarator-list
3798 can be omitted only when declaring a class (clause 9) or
3799 enumeration (7.2), that is, when the decl-specifier-seq contains
3800 either a class-specifier, an elaborated-type-specifier with
3801 a class-key (9.1), or an enum-specifier. In these cases and
3802 whenever a class-specifier or enum-specifier is present in the
3803 decl-specifier-seq, the identifiers in these specifiers are among
3804 the names being declared by the declaration (as class-name,
3805 enum-names, or enumerators, depending on the syntax). In such
3806 cases, and except for the declaration of an unnamed bit-field (9.6),
3807 the decl-specifier-seq shall introduce one or more names into the
3808 program, or shall redeclare a name introduced by a previous
3809 declaration. [Example:
3810 enum { }; // ill-formed
3811 typedef class { }; // ill-formed
3815 error ("missing type-name in typedef-declaration");
3818 /* Anonymous unions are objects, so they can have specifiers. */;
3819 SET_ANON_AGGR_TYPE_P (declared_type);
3821 if (TREE_CODE (declared_type) != UNION_TYPE && pedantic
3822 && !in_system_header)
3823 pedwarn ("ISO C++ prohibits anonymous structs");
3828 if (declspecs->specs[(int)ds_inline]
3829 || declspecs->specs[(int)ds_virtual])
3830 error ("%qs can only be specified for functions",
3831 declspecs->specs[(int)ds_inline]
3832 ? "inline" : "virtual");
3834 && (!current_class_type
3835 || current_scope () != current_class_type))
3836 error ("%<friend%> can only be specified inside a class");
3837 else if (declspecs->specs[(int)ds_explicit])
3838 error ("%<explicit%> can only be specified for constructors");
3839 else if (declspecs->storage_class)
3840 error ("a storage class can only be specified for objects "
3842 else if (declspecs->specs[(int)ds_const]
3843 || declspecs->specs[(int)ds_volatile]
3844 || declspecs->specs[(int)ds_restrict]
3845 || declspecs->specs[(int)ds_thread])
3846 error ("qualifiers can only be specified for objects "
3848 else if (saw_typedef)
3849 warning (0, "%<typedef%> was ignored in this declaration");
3852 return declared_type;
3855 /* Called when a declaration is seen that contains no names to declare.
3856 If its type is a reference to a structure, union or enum inherited
3857 from a containing scope, shadow that tag name for the current scope
3858 with a forward reference.
3859 If its type defines a new named structure or union
3860 or defines an enum, it is valid but we need not do anything here.
3861 Otherwise, it is an error.
3863 C++: may have to grok the declspecs to learn about static,
3864 complain for anonymous unions.
3866 Returns the TYPE declared -- or NULL_TREE if none. */
3869 shadow_tag (cp_decl_specifier_seq *declspecs)
3871 tree t = check_tag_decl (declspecs);
3876 if (declspecs->attributes)
3878 warning (0, "attribute ignored in declaration of %q+#T", t);
3879 warning (0, "attribute for %q+#T must follow the %qs keyword",
3880 t, class_key_or_enum_as_string (t));
3884 if (maybe_process_partial_specialization (t) == error_mark_node)
3887 /* This is where the variables in an anonymous union are
3888 declared. An anonymous union declaration looks like:
3890 because there is no declarator after the union, the parser
3891 sends that declaration here. */
3892 if (ANON_AGGR_TYPE_P (t))
3894 fixup_anonymous_aggr (t);
3896 if (TYPE_FIELDS (t))
3898 tree decl = grokdeclarator (/*declarator=*/NULL,
3899 declspecs, NORMAL, 0, NULL);
3900 finish_anon_union (decl);
3907 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3910 groktypename (cp_decl_specifier_seq *type_specifiers,
3911 const cp_declarator *declarator)
3915 attrs = type_specifiers->attributes;
3916 type_specifiers->attributes = NULL_TREE;
3917 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3918 if (attrs && type != error_mark_node)
3920 if (CLASS_TYPE_P (type))
3921 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3922 "outside of definition", type);
3923 else if (IS_AGGR_TYPE (type))
3924 /* A template type parameter or other dependent type. */
3925 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3926 "type %qT without an associated declaration", type);
3928 cplus_decl_attributes (&type, attrs, 0);
3933 /* Process a DECLARATOR for a function-scope variable declaration,
3934 namespace-scope variable declaration, or function declaration.
3935 (Function definitions go through start_function; class member
3936 declarations appearing in the body of the class go through
3937 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3938 If an error occurs, the error_mark_node is returned instead.
3940 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED
3941 is true if an explicit initializer is present, but false if this is
3942 a variable implicitly initialized via a default constructor.
3943 ATTRIBUTES and PREFIX_ATTRIBUTES are GNU attributes associated with
3944 this declaration. *PUSHED_SCOPE_P is set to the scope entered in
3945 this function, if any; if set, the caller is responsible for
3946 calling pop_scope. */
3949 start_decl (const cp_declarator *declarator,
3950 cp_decl_specifier_seq *declspecs,
3953 tree prefix_attributes,
3954 tree *pushed_scope_p)
3962 *pushed_scope_p = NULL_TREE;
3964 /* An object declared as __attribute__((deprecated)) suppresses
3965 warnings of uses of other deprecated items. */
3966 if (lookup_attribute ("deprecated", attributes))
3967 deprecated_state = DEPRECATED_SUPPRESS;
3969 attributes = chainon (attributes, prefix_attributes);
3971 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
3974 deprecated_state = DEPRECATED_NORMAL;
3976 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
3977 || decl == error_mark_node)
3978 return error_mark_node;
3980 type = TREE_TYPE (decl);
3982 context = DECL_CONTEXT (decl);
3986 *pushed_scope_p = push_scope (context);
3988 /* We are only interested in class contexts, later. */
3989 if (TREE_CODE (context) == NAMESPACE_DECL)
3990 context = NULL_TREE;
3994 /* Is it valid for this decl to have an initializer at all?
3995 If not, set INITIALIZED to zero, which will indirectly
3996 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
3997 switch (TREE_CODE (decl))
4000 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
4001 return error_mark_node;
4004 error ("function %q#D is initialized like a variable", decl);
4005 return error_mark_node;
4013 if (! toplevel_bindings_p ()
4014 && DECL_EXTERNAL (decl))
4015 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4017 DECL_EXTERNAL (decl) = 0;
4018 if (toplevel_bindings_p ())
4019 TREE_STATIC (decl) = 1;
4022 /* If this is a typedef that names the class for linkage purposes
4023 (7.1.3p8), apply any attributes directly to the type. */
4024 if (TREE_CODE (decl) == TYPE_DECL
4025 && TAGGED_TYPE_P (TREE_TYPE (decl))
4026 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4027 flags = ATTR_FLAG_TYPE_IN_PLACE;
4031 /* Set attributes here so if duplicate decl, will have proper attributes. */
4032 cplus_decl_attributes (&decl, attributes, flags);
4034 /* Dllimported symbols cannot be defined. Static data members (which
4035 can be initialized in-class and dllimported) go through grokfield,
4036 not here, so we don't need to exclude those decls when checking for
4038 if (initialized && DECL_DLLIMPORT_P (decl))
4040 error ("definition of %q#D is marked %<dllimport%>", decl);
4041 DECL_DLLIMPORT_P (decl) = 0;
4044 /* If #pragma weak was used, mark the decl weak now. */
4045 maybe_apply_pragma_weak (decl);
4047 if (TREE_CODE (decl) == FUNCTION_DECL
4048 && DECL_DECLARED_INLINE_P (decl)
4049 && DECL_UNINLINABLE (decl)
4050 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4051 warning (0, "inline function %q+D given attribute noinline", decl);
4053 if (context && COMPLETE_TYPE_P (complete_type (context)))
4055 if (TREE_CODE (decl) == VAR_DECL)
4057 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4058 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4059 error ("%q#D is not a static member of %q#T", decl, context);
4062 if (DECL_CONTEXT (field) != context)
4064 if (!same_type_p (DECL_CONTEXT (field), context))
4065 pedwarn ("ISO C++ does not permit %<%T::%D%> "
4066 "to be defined as %<%T::%D%>",
4067 DECL_CONTEXT (field), DECL_NAME (decl),
4068 context, DECL_NAME (decl));
4069 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4071 if (processing_specialization
4072 && template_class_depth (context) == 0
4073 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4074 error ("template header not allowed in member definition "
4075 "of explicitly specialized class");
4076 /* Static data member are tricky; an in-class initialization
4077 still doesn't provide a definition, so the in-class
4078 declaration will have DECL_EXTERNAL set, but will have an
4079 initialization. Thus, duplicate_decls won't warn
4080 about this situation, and so we check here. */
4081 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4082 error ("duplicate initialization of %qD", decl);
4083 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4089 tree field = check_classfn (context, decl,
4090 (processing_template_decl
4091 > template_class_depth (context))
4092 ? current_template_parms
4094 if (field && field != error_mark_node
4095 && duplicate_decls (decl, field,
4096 /*newdecl_is_friend=*/false))
4100 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4101 DECL_IN_AGGR_P (decl) = 0;
4102 /* Do not mark DECL as an explicit specialization if it was not
4103 already marked as an instantiation; a declaration should
4104 never be marked as a specialization unless we know what
4105 template is being specialized. */
4106 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4108 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4110 /* [temp.expl.spec] An explicit specialization of a static data
4111 member of a template is a definition if the declaration
4112 includes an initializer; otherwise, it is a declaration.
4114 We check for processing_specialization so this only applies
4115 to the new specialization syntax. */
4116 if (!initialized && processing_specialization)
4117 DECL_EXTERNAL (decl) = 1;
4120 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4121 pedwarn ("declaration of %q#D outside of class is not definition",
4125 was_public = TREE_PUBLIC (decl);
4127 /* Enter this declaration into the symbol table. */
4128 decl = maybe_push_decl (decl);
4130 if (processing_template_decl)
4131 decl = push_template_decl (decl);
4132 if (decl == error_mark_node)
4133 return error_mark_node;
4135 /* Tell the back end to use or not use .common as appropriate. If we say
4136 -fconserve-space, we want this to save .data space, at the expense of
4137 wrong semantics. If we say -fno-conserve-space, we want this to
4138 produce errors about redefs; to do this we force variables into the
4140 if (flag_conserve_space
4141 && TREE_CODE (decl) == VAR_DECL
4142 && TREE_PUBLIC (decl)
4143 && !DECL_THREAD_LOCAL_P (decl)
4144 && !have_global_bss_p ())
4145 DECL_COMMON (decl) = 1;
4147 if (TREE_CODE (decl) == VAR_DECL
4148 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4149 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4151 /* This is a const variable with implicit 'static'. Set
4152 DECL_THIS_STATIC so we can tell it from variables that are
4153 !TREE_PUBLIC because of the anonymous namespace. */
4154 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4155 DECL_THIS_STATIC (decl) = 1;
4158 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4159 start_decl_1 (decl, initialized);
4164 /* Process the declaration of a variable DECL. INITIALIZED is true
4165 iff DECL is explicitly initialized. (INITIALIZED is false if the
4166 variable is initialized via an implicitly-called constructor.)
4167 This function must be called for ordinary variables (including, for
4168 example, implicit instantiations of templates), but must not be
4169 called for template declarations. */
4172 start_decl_1 (tree decl, bool initialized)
4176 bool aggregate_definition_p;
4178 gcc_assert (!processing_template_decl);
4180 if (error_operand_p (decl))
4183 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4185 type = TREE_TYPE (decl);
4186 complete_p = COMPLETE_TYPE_P (type);
4187 aggregate_definition_p = IS_AGGR_TYPE (type) && !DECL_EXTERNAL (decl);
4189 /* If an explicit initializer is present, or if this is a definition
4190 of an aggregate, then we need a complete type at this point.
4191 (Scalars are always complete types, so there is nothing to
4192 check.) This code just sets COMPLETE_P; errors (if necessary)
4193 are issued below. */
4194 if ((initialized || aggregate_definition_p)
4196 && COMPLETE_TYPE_P (complete_type (type)))
4199 /* We will not yet have set TREE_READONLY on DECL if the type
4200 was "const", but incomplete, before this point. But, now, we
4201 have a complete type, so we can try again. */
4202 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4206 /* Is it valid for this decl to have an initializer at all? */
4208 /* Don't allow initializations for incomplete types except for
4209 arrays which might be completed by the initialization. */
4211 ; /* A complete type is ok. */
4212 else if (TREE_CODE (type) != ARRAY_TYPE)
4214 error ("variable %q#D has initializer but incomplete type", decl);
4215 type = TREE_TYPE (decl) = error_mark_node;
4217 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4219 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4220 error ("elements of array %q#D have incomplete type", decl);
4221 /* else we already gave an error in start_decl. */
4224 else if (aggregate_definition_p && !complete_p)
4226 error ("aggregate %q#D has incomplete type and cannot be defined",
4228 /* Change the type so that assemble_variable will give
4229 DECL an rtl we can live with: (mem (const_int 0)). */
4230 type = TREE_TYPE (decl) = error_mark_node;
4233 /* Create a new scope to hold this declaration if necessary.
4234 Whether or not a new scope is necessary cannot be determined
4235 until after the type has been completed; if the type is a
4236 specialization of a class template it is not until after
4237 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4238 will be set correctly. */
4239 maybe_push_cleanup_level (type);
4242 /* Handle initialization of references. DECL, TYPE, and INIT have the
4243 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4244 but will be set to a new CLEANUP_STMT if a temporary is created
4245 that must be destroyed subsequently.
4247 Returns an initializer expression to use to initialize DECL, or
4248 NULL if the initialization can be performed statically.
4250 Quotes on semantics can be found in ARM 8.4.3. */
4253 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4257 if (init == NULL_TREE)
4259 if ((DECL_LANG_SPECIFIC (decl) == 0
4260 || DECL_IN_AGGR_P (decl) == 0)
4261 && ! DECL_THIS_EXTERN (decl))
4262 error ("%qD declared as reference but not initialized", decl);
4266 if (TREE_CODE (init) == CONSTRUCTOR)
4268 error ("ISO C++ forbids use of initializer list to "
4269 "initialize reference %qD", decl);
4273 if (TREE_CODE (init) == TREE_LIST)
4274 init = build_x_compound_expr_from_list (init, "initializer");
4276 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4277 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4278 /* Note: default conversion is only called in very special cases. */
4279 init = decay_conversion (init);
4281 /* Convert INIT to the reference type TYPE. This may involve the
4282 creation of a temporary, whose lifetime must be the same as that
4283 of the reference. If so, a DECL_EXPR for the temporary will be
4284 added just after the DECL_EXPR for DECL. That's why we don't set
4285 DECL_INITIAL for local references (instead assigning to them
4286 explicitly); we need to allow the temporary to be initialized
4288 tmp = initialize_reference (type, init, decl, cleanup);
4290 if (tmp == error_mark_node)
4292 else if (tmp == NULL_TREE)
4294 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4298 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4301 DECL_INITIAL (decl) = tmp;
4306 /* Designated initializers in arrays are not supported in GNU C++.
4307 The parser cannot detect this error since it does not know whether
4308 a given brace-enclosed initializer is for a class type or for an
4309 array. This function checks that CE does not use a designated
4310 initializer. If it does, an error is issued. Returns true if CE
4311 is valid, i.e., does not have a designated initializer. */
4314 check_array_designated_initializer (const constructor_elt *ce)
4316 /* Designated initializers for array elements are not supported. */
4319 /* The parser only allows identifiers as designated
4321 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4322 error ("name %qD used in a GNU-style designated "
4323 "initializer for an array", ce->index);
4330 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4331 array until we finish parsing the initializer. If that's the
4332 situation we're in, update DECL accordingly. */
4335 maybe_deduce_size_from_array_init (tree decl, tree init)
4337 tree type = TREE_TYPE (decl);
4339 if (TREE_CODE (type) == ARRAY_TYPE
4340 && TYPE_DOMAIN (type) == NULL_TREE
4341 && TREE_CODE (decl) != TYPE_DECL)
4343 /* do_default is really a C-ism to deal with tentative definitions.
4344 But let's leave it here to ease the eventual merge. */
4345 int do_default = !DECL_EXTERNAL (decl);
4346 tree initializer = init ? init : DECL_INITIAL (decl);
4349 /* Check that there are no designated initializers in INIT, as
4350 those are not supported in GNU C++, and as the middle-end
4351 will crash if presented with a non-numeric designated
4353 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4355 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4356 constructor_elt *ce;
4359 VEC_iterate (constructor_elt, v, i, ce);
4361 if (!check_array_designated_initializer (ce))
4367 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4371 error ("initializer fails to determine size of %qD", decl);
4372 TREE_TYPE (decl) = error_mark_node;
4374 else if (failure == 2)
4378 error ("array size missing in %qD", decl);
4379 TREE_TYPE (decl) = error_mark_node;
4381 /* If a `static' var's size isn't known, make it extern as
4382 well as static, so it does not get allocated. If it's not
4383 `static', then don't mark it extern; finish_incomplete_decl
4384 will give it a default size and it will get allocated. */
4385 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4386 DECL_EXTERNAL (decl) = 1;
4388 else if (failure == 3)
4390 error ("zero-size array %qD", decl);
4391 TREE_TYPE (decl) = error_mark_node;
4395 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4397 layout_decl (decl, 0);
4401 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4402 any appropriate error messages regarding the layout. */
4405 layout_var_decl (tree decl)
4409 type = TREE_TYPE (decl);
4410 if (type == error_mark_node)
4413 /* If we haven't already layed out this declaration, do so now.
4414 Note that we must not call complete type for an external object
4415 because it's type might involve templates that we are not
4416 supposed to instantiate yet. (And it's perfectly valid to say
4417 `extern X x' for some incomplete type `X'.) */
4418 if (!DECL_EXTERNAL (decl))
4419 complete_type (type);
4420 if (!DECL_SIZE (decl)
4421 && TREE_TYPE (decl) != error_mark_node
4422 && (COMPLETE_TYPE_P (type)
4423 || (TREE_CODE (type) == ARRAY_TYPE
4424 && !TYPE_DOMAIN (type)
4425 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4426 layout_decl (decl, 0);
4428 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4430 /* An automatic variable with an incomplete type: that is an error.
4431 Don't talk about array types here, since we took care of that
4432 message in grokdeclarator. */
4433 error ("storage size of %qD isn't known", decl);
4434 TREE_TYPE (decl) = error_mark_node;
4437 /* Keep this code around in case we later want to control debug info
4438 based on whether a type is "used". (jason 1999-11-11) */
4440 else if (!DECL_EXTERNAL (decl) && IS_AGGR_TYPE (ttype))
4441 /* Let debugger know it should output info for this type. */
4442 note_debug_info_needed (ttype);
4444 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4445 note_debug_info_needed (DECL_CONTEXT (decl));
4448 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4449 && DECL_SIZE (decl) != NULL_TREE
4450 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4452 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4453 constant_expression_warning (DECL_SIZE (decl));
4455 error ("storage size of %qD isn't constant", decl);
4459 /* If a local static variable is declared in an inline function, or if
4460 we have a weak definition, we must endeavor to create only one
4461 instance of the variable at link-time. */
4464 maybe_commonize_var (tree decl)
4466 /* Static data in a function with comdat linkage also has comdat
4468 if (TREE_STATIC (decl)
4469 /* Don't mess with __FUNCTION__. */
4470 && ! DECL_ARTIFICIAL (decl)
4471 && DECL_FUNCTION_SCOPE_P (decl)
4472 /* Unfortunately, import_export_decl has not always been called
4473 before the function is processed, so we cannot simply check
4475 && (DECL_COMDAT (DECL_CONTEXT (decl))
4476 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4477 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4478 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4482 /* With weak symbols, we simply make the variable COMDAT;
4483 that will cause copies in multiple translations units to
4485 comdat_linkage (decl);
4489 if (DECL_INITIAL (decl) == NULL_TREE
4490 || DECL_INITIAL (decl) == error_mark_node)
4492 /* Without weak symbols, we can use COMMON to merge
4493 uninitialized variables. */
4494 TREE_PUBLIC (decl) = 1;
4495 DECL_COMMON (decl) = 1;
4499 /* While for initialized variables, we must use internal
4500 linkage -- which means that multiple copies will not
4502 TREE_PUBLIC (decl) = 0;
4503 DECL_COMMON (decl) = 0;
4504 warning (0, "sorry: semantics of inline function static "
4505 "data %q+#D are wrong (you'll wind up "
4506 "with multiple copies)", decl);
4507 warning (0, "%J you can work around this by removing "
4513 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4514 /* Set it up again; we might have set DECL_INITIAL since the last
4516 comdat_linkage (decl);
4519 /* Issue an error message if DECL is an uninitialized const variable. */
4522 check_for_uninitialized_const_var (tree decl)
4524 tree type = TREE_TYPE (decl);
4526 /* ``Unless explicitly declared extern, a const object does not have
4527 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4529 if (TREE_CODE (decl) == VAR_DECL
4530 && TREE_CODE (type) != REFERENCE_TYPE
4531 && CP_TYPE_CONST_P (type)
4532 && !TYPE_NEEDS_CONSTRUCTING (type)
4533 && !DECL_INITIAL (decl))
4534 error ("uninitialized const %qD", decl);
4538 /* Structure holding the current initializer being processed by reshape_init.
4539 CUR is a pointer to the current element being processed, END is a pointer
4540 after the last element present in the initializer. */
4541 typedef struct reshape_iterator_t
4543 constructor_elt *cur;
4544 constructor_elt *end;
4547 static tree reshape_init_r (tree, reshape_iter *, bool);
4549 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4550 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4551 initialized. If there are no more such fields, the return value
4555 next_initializable_field (tree field)
4558 && (TREE_CODE (field) != FIELD_DECL
4559 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4560 || DECL_ARTIFICIAL (field)))
4561 field = TREE_CHAIN (field);
4566 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4567 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4568 INTEGER_CST representing the size of the array minus one (the maximum index),
4569 or NULL_TREE if the array was declared without specifying the size. D is
4570 the iterator within the constructor. */
4573 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4576 bool sized_array_p = (max_index != NULL_TREE);
4577 unsigned HOST_WIDE_INT max_index_cst = 0;
4578 unsigned HOST_WIDE_INT index;
4580 /* The initializer for an array is always a CONSTRUCTOR. */
4581 new_init = build_constructor (NULL_TREE, NULL);
4585 /* Minus 1 is used for zero sized arrays. */
4586 if (integer_all_onesp (max_index))
4589 if (host_integerp (max_index, 1))
4590 max_index_cst = tree_low_cst (max_index, 1);
4591 /* sizetype is sign extended, not zero extended. */
4593 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4597 /* Loop until there are no more initializers. */
4599 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4604 check_array_designated_initializer (d->cur);
4605 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4606 if (elt_init == error_mark_node)
4607 return error_mark_node;
4608 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4614 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4615 Parameters are the same of reshape_init_r. */
4618 reshape_init_array (tree type, reshape_iter *d)
4620 tree max_index = NULL_TREE;
4622 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4624 if (TYPE_DOMAIN (type))
4625 max_index = array_type_nelts (type);
4627 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4630 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4631 Parameters are the same of reshape_init_r. */
4634 reshape_init_vector (tree type, reshape_iter *d)
4636 tree max_index = NULL_TREE;
4639 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4641 if (COMPOUND_LITERAL_P (d->cur->value))
4643 tree value = d->cur->value;
4644 if (!same_type_p (TREE_TYPE (value), type))
4646 error ("invalid type %qT as initializer for a vector of type %qT",
4647 TREE_TYPE (d->cur->value), type);
4648 value = error_mark_node;
4654 /* For a vector, the representation type is a struct
4655 containing a single member which is an array of the
4656 appropriate size. */
4657 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4658 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4659 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4661 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4664 /* Subroutine of reshape_init_r, processes the initializers for classes
4665 or union. Parameters are the same of reshape_init_r. */
4668 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4673 gcc_assert (CLASS_TYPE_P (type));
4675 /* The initializer for a class is always a CONSTRUCTOR. */
4676 new_init = build_constructor (NULL_TREE, NULL);
4677 field = next_initializable_field (TYPE_FIELDS (type));
4683 An initializer for an aggregate member that is an
4684 empty class shall have the form of an empty
4685 initializer-list {}. */
4686 if (!first_initializer_p)
4688 error ("initializer for %qT must be brace-enclosed", type);
4689 return error_mark_node;
4694 /* Loop through the initializable fields, gathering initializers. */
4695 while (d->cur != d->end)
4699 /* Handle designated initializers, as an extension. */
4702 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4704 if (!field || TREE_CODE (field) != FIELD_DECL)
4706 error ("%qT has no non-static data member named %qD", type,
4708 return error_mark_node;
4712 /* If we processed all the member of the class, we are done. */
4716 field_init = reshape_init_r (TREE_TYPE (field), d,
4717 /*first_initializer_p=*/false);
4718 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4722 When a union is initialized with a brace-enclosed
4723 initializer, the braces shall only contain an
4724 initializer for the first member of the union. */
4725 if (TREE_CODE (type) == UNION_TYPE)
4728 field = next_initializable_field (TREE_CHAIN (field));
4734 /* Subroutine of reshape_init, which processes a single initializer (part of
4735 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4736 iterator within the CONSTRUCTOR which points to the initializer to process.
4737 FIRST_INITIALIZER_P is true if this is the first initializer of the
4738 CONSTRUCTOR node. */
4741 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4743 tree init = d->cur->value;
4745 /* A non-aggregate type is always initialized with a single
4747 if (!CP_AGGREGATE_TYPE_P (type))
4749 /* It is invalid to initialize a non-aggregate type with a
4750 brace-enclosed initializer.
4751 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4752 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4753 a CONSTRUCTOR (with a record type). */
4754 if (TREE_CODE (init) == CONSTRUCTOR
4755 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4757 error ("braces around scalar initializer for type %qT", type);
4758 init = error_mark_node;
4767 All implicit type conversions (clause _conv_) are considered when
4768 initializing the aggregate member with an initializer from an
4769 initializer-list. If the initializer can initialize a member,
4770 the member is initialized. Otherwise, if the member is itself a
4771 non-empty subaggregate, brace elision is assumed and the
4772 initializer is considered for the initialization of the first
4773 member of the subaggregate. */
4774 if (TREE_CODE (init) != CONSTRUCTOR
4775 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4781 /* [dcl.init.string]
4783 A char array (whether plain char, signed char, or unsigned char)
4784 can be initialized by a string-literal (optionally enclosed in
4785 braces); a wchar_t array can be initialized by a wide
4786 string-literal (optionally enclosed in braces). */
4787 if (TREE_CODE (type) == ARRAY_TYPE
4788 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4790 tree str_init = init;
4792 /* Strip one level of braces if and only if they enclose a single
4793 element (as allowed by [dcl.init.string]). */
4794 if (!first_initializer_p
4795 && TREE_CODE (str_init) == CONSTRUCTOR
4796 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4798 str_init = VEC_index (constructor_elt,
4799 CONSTRUCTOR_ELTS (str_init), 0)->value;
4802 /* If it's a string literal, then it's the initializer for the array
4803 as a whole. Otherwise, continue with normal initialization for
4804 array types (one value per array element). */
4805 if (TREE_CODE (str_init) == STRING_CST)
4812 /* The following cases are about aggregates. If we are not within a full
4813 initializer already, and there is not a CONSTRUCTOR, it means that there
4814 is a missing set of braces (that is, we are processing the case for
4815 which reshape_init exists). */
4816 if (!first_initializer_p)
4818 if (TREE_CODE (init) == CONSTRUCTOR)
4820 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4821 /* There is no need to reshape pointer-to-member function
4822 initializers, as they are always constructed correctly
4823 by the front end. */
4825 else if (COMPOUND_LITERAL_P (init))
4826 /* For a nested compound literal, there is no need to reshape since
4827 brace elision is not allowed. Even if we decided to allow it,
4828 we should add a call to reshape_init in finish_compound_literal,
4829 before calling digest_init, so changing this code would still
4830 not be necessary. */
4831 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4835 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4836 return reshape_init (type, init);
4840 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4844 /* Dispatch to specialized routines. */
4845 if (CLASS_TYPE_P (type))
4846 return reshape_init_class (type, d, first_initializer_p);
4847 else if (TREE_CODE (type) == ARRAY_TYPE)
4848 return reshape_init_array (type, d);
4849 else if (TREE_CODE (type) == VECTOR_TYPE)
4850 return reshape_init_vector (type, d);
4855 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4856 brace-enclosed aggregate initializer.
4858 INIT is the CONSTRUCTOR containing the list of initializers describing
4859 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4860 It may not presently match the shape of the TYPE; for example:
4862 struct S { int a; int b; };
4863 struct S a[] = { 1, 2, 3, 4 };
4865 Here INIT will hold a VEC of four elements, rather than a
4866 VEC of two elements, each itself a VEC of two elements. This
4867 routine transforms INIT from the former form into the latter. The
4868 revised CONSTRUCTOR node is returned. */
4871 reshape_init (tree type, tree init)
4873 VEC(constructor_elt, gc) *v;
4877 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4879 v = CONSTRUCTOR_ELTS (init);
4881 /* An empty constructor does not need reshaping, and it is always a valid
4883 if (VEC_empty (constructor_elt, v))
4886 /* Recurse on this CONSTRUCTOR. */
4887 d.cur = VEC_index (constructor_elt, v, 0);
4888 d.end = d.cur + VEC_length (constructor_elt, v);
4890 new_init = reshape_init_r (type, &d, true);
4891 if (new_init == error_mark_node)
4892 return error_mark_node;
4894 /* Make sure all the element of the constructor were used. Otherwise,
4895 issue an error about exceeding initializers. */
4897 error ("too many initializers for %qT", type);
4902 /* Verify INIT (the initializer for DECL), and record the
4903 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
4904 grok_reference_init.
4906 If the return value is non-NULL, it is an expression that must be
4907 evaluated dynamically to initialize DECL. */
4910 check_initializer (tree decl, tree init, int flags, tree *cleanup)
4912 tree type = TREE_TYPE (decl);
4913 tree init_code = NULL;
4915 /* Things that are going to be initialized need to have complete
4917 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
4919 if (type == error_mark_node)
4920 /* We will have already complained. */
4923 if (TREE_CODE (type) == ARRAY_TYPE)
4925 tree element_type = TREE_TYPE (type);
4927 /* The array type itself need not be complete, because the
4928 initializer may tell us how many elements are in the array.
4929 But, the elements of the array must be complete. */
4930 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4932 error ("elements of array %q#D have incomplete type", decl);
4935 /* It is not valid to initialize a VLA. */
4937 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
4938 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
4940 error ("variable-sized object %qD may not be initialized", decl);
4944 else if (!COMPLETE_TYPE_P (type))
4946 error ("%qD has incomplete type", decl);
4947 TREE_TYPE (decl) = error_mark_node;
4951 /* There is no way to make a variable-sized class type in GNU C++. */
4952 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
4954 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
4956 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
4957 if (SCALAR_TYPE_P (type))
4961 error ("scalar object %qD requires one element in initializer",
4963 TREE_TYPE (decl) = error_mark_node;
4967 else if ((cxx_dialect == cxx98) && !CP_AGGREGATE_TYPE_P (type))
4969 /* A non-aggregate that is not a scalar cannot be initialized
4970 via an initializer-list in C++98. */
4971 error ("braces around initializer for non-aggregate type %qT",
4973 TREE_TYPE (decl) = error_mark_node;
4978 if (TREE_CODE (decl) == CONST_DECL)
4980 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
4982 DECL_INITIAL (decl) = init;
4984 gcc_assert (init != NULL_TREE);
4987 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
4988 init = grok_reference_init (decl, type, init, cleanup);
4991 /* Do not reshape constructors of vectors (they don't need to be
4993 if (TREE_CODE (init) == CONSTRUCTOR
4994 && !COMPOUND_LITERAL_P (init)
4995 && !TREE_TYPE (init)) /* ptrmemfunc */
4997 init = reshape_init (type, init);
4999 if ((*targetm.vector_opaque_p) (type))
5001 error ("opaque vector types cannot be initialized");
5002 init = error_mark_node;
5006 /* If DECL has an array type without a specific bound, deduce the
5007 array size from the initializer. */
5008 maybe_deduce_size_from_array_init (decl, init);
5009 type = TREE_TYPE (decl);
5010 if (type == error_mark_node)
5013 if (TREE_CODE (type) == ARRAY_TYPE && TYPE_NEEDS_CONSTRUCTING (type))
5014 goto initialize_aggr;
5015 else if (CLASS_TYPE_P (type))
5017 if (TREE_CODE (init) == CONSTRUCTOR)
5019 if (TYPE_NON_AGGREGATE_CLASS (type))
5021 error ("%qD must be initialized by constructor, "
5024 init = error_mark_node;
5027 goto dont_use_constructor;
5031 int saved_stmts_are_full_exprs_p;
5034 saved_stmts_are_full_exprs_p = 0;
5035 if (building_stmt_tree ())
5037 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5038 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5040 init = build_aggr_init (decl, init, flags);
5041 if (building_stmt_tree ())
5042 current_stmt_tree ()->stmts_are_full_exprs_p =
5043 saved_stmts_are_full_exprs_p;
5049 dont_use_constructor:
5050 if (TREE_CODE (init) != TREE_VEC)
5052 init_code = store_init_value (decl, init);
5053 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5054 && DECL_INITIAL (decl)
5055 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5056 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5057 warning (0, "array %qD initialized by parenthesized string literal %qE",
5058 decl, DECL_INITIAL (decl));
5063 else if (DECL_EXTERNAL (decl))
5065 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5066 goto initialize_aggr;
5067 else if (IS_AGGR_TYPE (type))
5069 tree core_type = strip_array_types (type);
5071 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5072 error ("structure %qD with uninitialized const members", decl);
5073 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5074 error ("structure %qD with uninitialized reference members", decl);
5076 check_for_uninitialized_const_var (decl);
5079 check_for_uninitialized_const_var (decl);
5081 if (init && init != error_mark_node)
5082 init_code = build2 (INIT_EXPR, type, decl, init);
5087 /* If DECL is not a local variable, give it RTL. */
5090 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5092 int toplev = toplevel_bindings_p ();
5094 const char *filename;
5096 /* Set the DECL_ASSEMBLER_NAME for the object. */
5099 /* The `register' keyword, when used together with an
5100 asm-specification, indicates that the variable should be
5101 placed in a particular register. */
5102 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5104 set_user_assembler_name (decl, asmspec);
5105 DECL_HARD_REGISTER (decl) = 1;
5109 if (TREE_CODE (decl) == FUNCTION_DECL
5110 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5111 set_builtin_user_assembler_name (decl, asmspec);
5112 set_user_assembler_name (decl, asmspec);
5116 /* Handle non-variables up front. */
5117 if (TREE_CODE (decl) != VAR_DECL)
5119 rest_of_decl_compilation (decl, toplev, at_eof);
5123 /* If we see a class member here, it should be a static data
5125 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5127 gcc_assert (TREE_STATIC (decl));
5128 /* An in-class declaration of a static data member should be
5129 external; it is only a declaration, and not a definition. */
5130 if (init == NULL_TREE)
5131 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5134 /* We don't create any RTL for local variables. */
5135 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5138 /* We defer emission of local statics until the corresponding
5139 DECL_EXPR is expanded. */
5140 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5142 /* We try to defer namespace-scope static constants so that they are
5143 not emitted into the object file unnecessarily. */
5144 filename = input_filename;
5145 if (!DECL_VIRTUAL_P (decl)
5146 && TREE_READONLY (decl)
5147 && DECL_INITIAL (decl) != NULL_TREE
5148 && DECL_INITIAL (decl) != error_mark_node
5150 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5152 && !TREE_PUBLIC (decl))
5154 /* Fool with the linkage of static consts according to #pragma
5156 struct c_fileinfo *finfo = get_fileinfo (filename);
5157 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5159 TREE_PUBLIC (decl) = 1;
5160 DECL_EXTERNAL (decl) = finfo->interface_only;
5165 /* Likewise for template instantiations. */
5166 else if (DECL_LANG_SPECIFIC (decl)
5167 && DECL_IMPLICIT_INSTANTIATION (decl))
5170 /* If we're not deferring, go ahead and assemble the variable. */
5172 rest_of_decl_compilation (decl, toplev, at_eof);
5175 /* walk_tree helper for wrap_temporary_cleanups, below. */
5178 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5180 if (TYPE_P (*stmt_p))
5186 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5188 tree guard = (tree)data;
5189 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5191 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5192 /* Tell honor_protect_cleanup_actions to handle this as a separate
5194 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5196 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5202 /* We're initializing a local variable which has a cleanup GUARD. If there
5203 are any temporaries used in the initializer INIT of this variable, we
5204 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5205 variable will be cleaned up properly if one of them throws.
5207 Unfortunately, there's no way to express this properly in terms of
5208 nesting, as the regions for the temporaries overlap the region for the
5209 variable itself; if there are two temporaries, the variable needs to be
5210 the first thing destroyed if either of them throws. However, we only
5211 want to run the variable's cleanup if it actually got constructed. So
5212 we need to guard the temporary cleanups with the variable's cleanup if
5213 they are run on the normal path, but not if they are run on the
5214 exceptional path. We implement this by telling
5215 honor_protect_cleanup_actions to strip the variable cleanup from the
5216 exceptional path. */
5219 wrap_temporary_cleanups (tree init, tree guard)
5221 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5224 /* Generate code to initialize DECL (a local variable). */
5227 initialize_local_var (tree decl, tree init)
5229 tree type = TREE_TYPE (decl);
5233 gcc_assert (TREE_CODE (decl) == VAR_DECL
5234 || TREE_CODE (decl) == RESULT_DECL);
5235 gcc_assert (!TREE_STATIC (decl));
5237 if (DECL_SIZE (decl) == NULL_TREE)
5239 /* If we used it already as memory, it must stay in memory. */
5240 DECL_INITIAL (decl) = NULL_TREE;
5241 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5245 if (type == error_mark_node)
5248 /* Compute and store the initial value. */
5249 already_used = TREE_USED (decl) || TREE_USED (type);
5251 /* Generate a cleanup, if necessary. */
5252 cleanup = cxx_maybe_build_cleanup (decl);
5254 /* Perform the initialization. */
5257 int saved_stmts_are_full_exprs_p;
5259 /* If we're only initializing a single object, guard the destructors
5260 of any temporaries used in its initializer with its destructor.
5261 This isn't right for arrays because each element initialization is
5262 a full-expression. */
5263 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5264 wrap_temporary_cleanups (init, cleanup);
5266 gcc_assert (building_stmt_tree ());
5267 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5268 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5269 finish_expr_stmt (init);
5270 current_stmt_tree ()->stmts_are_full_exprs_p =
5271 saved_stmts_are_full_exprs_p;
5274 /* Set this to 0 so we can tell whether an aggregate which was
5275 initialized was ever used. Don't do this if it has a
5276 destructor, so we don't complain about the 'resource
5277 allocation is initialization' idiom. Now set
5278 attribute((unused)) on types so decls of that type will be
5279 marked used. (see TREE_USED, above.) */
5280 if (TYPE_NEEDS_CONSTRUCTING (type)
5282 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5283 && DECL_NAME (decl))
5284 TREE_USED (decl) = 0;
5285 else if (already_used)
5286 TREE_USED (decl) = 1;
5289 finish_decl_cleanup (decl, cleanup);
5292 /* DECL is a VAR_DECL for a compiler-generated variable with static
5293 storage duration (like a virtual table) whose initializer is a
5294 compile-time constant. INIT must be either a TREE_LIST of values,
5295 or a CONSTRUCTOR. Initialize the variable and provide it to the
5299 initialize_artificial_var (tree decl, tree init)
5301 gcc_assert (DECL_ARTIFICIAL (decl));
5302 if (TREE_CODE (init) == TREE_LIST)
5303 init = build_constructor_from_list (NULL_TREE, init);
5304 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5305 DECL_INITIAL (decl) = init;
5306 DECL_INITIALIZED_P (decl) = 1;
5307 determine_visibility (decl);
5308 layout_var_decl (decl);
5309 maybe_commonize_var (decl);
5310 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5313 /* INIT is the initializer for a variable, as represented by the
5314 parser. Returns true iff INIT is value-dependent. */
5317 value_dependent_init_p (tree init)
5319 if (TREE_CODE (init) == TREE_LIST)
5320 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5321 return any_value_dependent_elements_p (init);
5322 else if (TREE_CODE (init) == CONSTRUCTOR)
5323 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5325 VEC(constructor_elt, gc) *elts;
5329 elts = CONSTRUCTOR_ELTS (init);
5330 nelts = VEC_length (constructor_elt, elts);
5331 for (i = 0; i < nelts; ++i)
5332 if (value_dependent_init_p (VEC_index (constructor_elt,
5337 /* It must be a simple expression, e.g., int i = 3; */
5338 return value_dependent_expression_p (init);
5343 /* Finish processing of a declaration;
5344 install its line number and initial value.
5345 If the length of an array type is not known before,
5346 it must be determined now, from the initial value, or it is an error.
5348 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5349 true, then INIT is an integral constant expression.
5351 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5352 if the (init) syntax was used. */
5355 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5356 tree asmspec_tree, int flags)
5360 const char *asmspec = NULL;
5361 int was_readonly = 0;
5362 bool var_definition_p = false;
5363 int saved_processing_template_decl;
5365 if (decl == error_mark_node)
5370 error ("assignment (not initialization) in declaration");
5374 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5375 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5376 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5378 type = TREE_TYPE (decl);
5379 if (type == error_mark_node)
5382 /* Assume no cleanup is required. */
5383 cleanup = NULL_TREE;
5384 saved_processing_template_decl = processing_template_decl;
5386 /* If a name was specified, get the string. */
5387 if (global_scope_p (current_binding_level))
5388 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5389 if (asmspec_tree && asmspec_tree != error_mark_node)
5390 asmspec = TREE_STRING_POINTER (asmspec_tree);
5392 if (current_class_type
5393 && CP_DECL_CONTEXT (decl) == current_class_type
5394 && TYPE_BEING_DEFINED (current_class_type)
5395 && (DECL_INITIAL (decl) || init))
5396 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5398 if (processing_template_decl)
5400 bool type_dependent_p;
5402 /* Add this declaration to the statement-tree. */
5403 if (at_function_scope_p ())
5404 add_decl_expr (decl);
5406 type_dependent_p = dependent_type_p (type);
5408 if (check_for_bare_parameter_packs (init))
5411 DECL_INITIAL (decl) = NULL_TREE;
5414 if (init && init_const_expr_p)
5416 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5417 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5418 TREE_CONSTANT (decl) = 1;
5421 /* Generally, initializers in templates are expanded when the
5422 template is instantiated. But, if DECL is an integral
5423 constant static data member, then it can be used in future
5424 integral constant expressions, and its value must be
5427 && DECL_CLASS_SCOPE_P (decl)
5428 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5429 && !type_dependent_p
5430 && !value_dependent_init_p (init)))
5433 DECL_INITIAL (decl) = init;
5434 if (TREE_CODE (decl) == VAR_DECL
5435 && !DECL_PRETTY_FUNCTION_P (decl)
5436 && !type_dependent_p)
5437 maybe_deduce_size_from_array_init (decl, init);
5441 if (TREE_CODE (init) == TREE_LIST)
5443 /* If the parenthesized-initializer form was used (e.g.,
5444 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5445 arguments. (There is generally only one.) We convert them
5448 for (; list; list = TREE_CHAIN (list))
5450 tree elt = TREE_VALUE (list);
5451 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5455 init = fold_non_dependent_expr (init);
5456 processing_template_decl = 0;
5459 /* Take care of TYPE_DECLs up front. */
5460 if (TREE_CODE (decl) == TYPE_DECL)
5462 if (type != error_mark_node
5463 && IS_AGGR_TYPE (type) && DECL_NAME (decl))
5465 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5466 warning (0, "shadowing previous type declaration of %q#D", decl);
5467 set_identifier_type_value (DECL_NAME (decl), decl);
5470 /* If we have installed this as the canonical typedef for this
5471 type, and that type has not been defined yet, delay emitting
5472 the debug information for it, as we will emit it later. */
5473 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5474 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5475 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5477 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5482 /* A reference will be modified here, as it is initialized. */
5483 if (! DECL_EXTERNAL (decl)
5484 && TREE_READONLY (decl)
5485 && TREE_CODE (type) == REFERENCE_TYPE)
5488 TREE_READONLY (decl) = 0;
5491 if (TREE_CODE (decl) == VAR_DECL)
5493 /* Only PODs can have thread-local storage. Other types may require
5494 various kinds of non-trivial initialization. */
5495 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5496 error ("%qD cannot be thread-local because it has non-POD type %qT",
5497 decl, TREE_TYPE (decl));
5498 /* If this is a local variable that will need a mangled name,
5499 register it now. We must do this before processing the
5500 initializer for the variable, since the initialization might
5501 require a guard variable, and since the mangled name of the
5502 guard variable will depend on the mangled name of this
5504 if (DECL_FUNCTION_SCOPE_P (decl)
5505 && TREE_STATIC (decl)
5506 && !DECL_ARTIFICIAL (decl))
5507 push_local_name (decl);
5508 /* Convert the initializer to the type of DECL, if we have not
5509 already initialized DECL. */
5510 if (!DECL_INITIALIZED_P (decl)
5511 /* If !DECL_EXTERNAL then DECL is being defined. In the
5512 case of a static data member initialized inside the
5513 class-specifier, there can be an initializer even if DECL
5514 is *not* defined. */
5515 && (!DECL_EXTERNAL (decl) || init))
5517 if (TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5520 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5521 /* Allow libjava/prims.cc define primitive classes. */
5522 if (init != NULL_TREE
5523 || jclass == NULL_TREE
5524 || TREE_CODE (jclass) != TYPE_DECL
5525 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5526 || !same_type_ignoring_top_level_qualifiers_p
5527 (type, TREE_TYPE (TREE_TYPE (jclass))))
5528 error ("Java object %qD not allocated with %<new%>", decl);
5533 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5534 if (init_const_expr_p)
5536 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5537 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5538 TREE_CONSTANT (decl) = 1;
5541 init = check_initializer (decl, init, flags, &cleanup);
5542 /* Thread-local storage cannot be dynamically initialized. */
5543 if (DECL_THREAD_LOCAL_P (decl) && init)
5545 error ("%qD is thread-local and so cannot be dynamically "
5546 "initialized", decl);
5550 /* Check that the initializer for a static data member was a
5551 constant. Although we check in the parser that the
5552 initializer is an integral constant expression, we do not
5553 simplify division-by-zero at the point at which it
5554 occurs. Therefore, in:
5556 struct S { static const int i = 7 / 0; };
5558 we issue an error at this point. It would
5559 probably be better to forbid division by zero in
5560 integral constant expressions. */
5561 if (DECL_EXTERNAL (decl) && init)
5563 error ("%qD cannot be initialized by a non-constant expression"
5564 " when being declared", decl);
5565 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5573 The memory occupied by any object of static storage
5574 duration is zero-initialized at program startup before
5575 any other initialization takes place.
5577 We cannot create an appropriate initializer until after
5578 the type of DECL is finalized. If DECL_INITIAL is set,
5579 then the DECL is statically initialized, and any
5580 necessary zero-initialization has already been performed. */
5581 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5582 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5583 /*nelts=*/NULL_TREE,
5584 /*static_storage_p=*/true);
5585 /* Remember that the initialization for this variable has
5587 DECL_INITIALIZED_P (decl) = 1;
5588 /* This declaration is the definition of this variable,
5589 unless we are initializing a static data member within
5590 the class specifier. */
5591 if (!DECL_EXTERNAL (decl))
5592 var_definition_p = true;
5594 /* If the variable has an array type, lay out the type, even if
5595 there is no initializer. It is valid to index through the
5596 array, and we must get TYPE_ALIGN set correctly on the array
5598 else if (TREE_CODE (type) == ARRAY_TYPE)
5601 else if (TREE_CODE (decl) == FIELD_DECL
5602 && TYPE_FOR_JAVA (type) && IS_AGGR_TYPE (type))
5603 error ("non-static data member %qD has Java class type", decl);
5605 /* Add this declaration to the statement-tree. This needs to happen
5606 after the call to check_initializer so that the DECL_EXPR for a
5607 reference temp is added before the DECL_EXPR for the reference itself. */
5608 if (at_function_scope_p ())
5609 add_decl_expr (decl);
5611 /* Let the middle end know about variables and functions -- but not
5612 static data members in uninstantiated class templates. */
5613 if (!saved_processing_template_decl
5614 && (TREE_CODE (decl) == VAR_DECL
5615 || TREE_CODE (decl) == FUNCTION_DECL))
5617 if (TREE_CODE (decl) == VAR_DECL)
5619 layout_var_decl (decl);
5620 maybe_commonize_var (decl);
5623 /* This needs to happen after the linkage is set. */
5624 determine_visibility (decl);
5626 if (var_definition_p && TREE_STATIC (decl))
5628 /* If a TREE_READONLY variable needs initialization
5629 at runtime, it is no longer readonly and we need to
5630 avoid MEM_READONLY_P being set on RTL created for it. */
5633 if (TREE_READONLY (decl))
5634 TREE_READONLY (decl) = 0;
5637 else if (was_readonly)
5638 TREE_READONLY (decl) = 1;
5641 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5643 /* Check for abstractness of the type. Notice that there is no
5644 need to strip array types here since the check for those types
5645 is already done within create_array_type_for_decl. */
5646 if (TREE_CODE (type) == FUNCTION_TYPE
5647 || TREE_CODE (type) == METHOD_TYPE)
5648 abstract_virtuals_error (decl, TREE_TYPE (type));
5650 abstract_virtuals_error (decl, type);
5652 if (TREE_CODE (decl) == FUNCTION_DECL
5653 || TREE_TYPE (decl) == error_mark_node)
5654 /* No initialization required. */
5656 else if (DECL_EXTERNAL (decl)
5657 && ! (DECL_LANG_SPECIFIC (decl)
5658 && DECL_NOT_REALLY_EXTERN (decl)))
5661 DECL_INITIAL (decl) = init;
5663 /* A variable definition. */
5664 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5665 /* Initialize the local variable. */
5666 initialize_local_var (decl, init);
5668 /* If a variable is defined, and then a subsequent
5669 definition with external linkage is encountered, we will
5670 get here twice for the same variable. We want to avoid
5671 calling expand_static_init more than once. For variables
5672 that are not static data members, we can call
5673 expand_static_init only when we actually process the
5674 initializer. It is not legal to redeclare a static data
5675 member, so this issue does not arise in that case. */
5676 else if (var_definition_p && TREE_STATIC (decl))
5677 expand_static_init (decl, init);
5680 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5681 reference, insert it in the statement-tree now. */
5683 push_cleanup (decl, cleanup, false);
5686 processing_template_decl = saved_processing_template_decl;
5689 TREE_READONLY (decl) = 1;
5691 /* If this was marked 'used', be sure it will be output. */
5692 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5693 mark_decl_referenced (decl);
5696 /* This is here for a midend callback from c-common.c. */
5699 finish_decl (tree decl, tree init, tree asmspec_tree)
5701 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5704 /* Returns a declaration for a VAR_DECL as if:
5706 extern "C" TYPE NAME;
5708 had been seen. Used to create compiler-generated global
5712 declare_global_var (tree name, tree type)
5716 push_to_top_level ();
5717 decl = build_decl (VAR_DECL, name, type);
5718 TREE_PUBLIC (decl) = 1;
5719 DECL_EXTERNAL (decl) = 1;
5720 DECL_ARTIFICIAL (decl) = 1;
5721 /* If the user has explicitly declared this variable (perhaps
5722 because the code we are compiling is part of a low-level runtime
5723 library), then it is possible that our declaration will be merged
5724 with theirs by pushdecl. */
5725 decl = pushdecl (decl);
5726 finish_decl (decl, NULL_TREE, NULL_TREE);
5727 pop_from_top_level ();
5732 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5733 if "__cxa_atexit" is not being used) corresponding to the function
5734 to be called when the program exits. */
5737 get_atexit_fn_ptr_type (void)
5742 if (!atexit_fn_ptr_type_node)
5744 if (flag_use_cxa_atexit
5745 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5746 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5747 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5749 /* The parameter to "atexit" is "void (*)(void)". */
5750 arg_types = void_list_node;
5752 fn_type = build_function_type (void_type_node, arg_types);
5753 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5756 return atexit_fn_ptr_type_node;
5759 /* Returns a pointer to the `atexit' function. Note that if
5760 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5761 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5764 get_atexit_node (void)
5771 bool use_aeabi_atexit;
5776 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5778 /* The declaration for `__cxa_atexit' is:
5780 int __cxa_atexit (void (*)(void *), void *, void *)
5782 We build up the argument types and then then function type
5785 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5786 /* First, build the pointer-to-function type for the first
5788 fn_ptr_type = get_atexit_fn_ptr_type ();
5789 /* Then, build the rest of the argument types. */
5790 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5791 if (use_aeabi_atexit)
5793 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5794 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5798 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5799 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5801 /* And the final __cxa_atexit type. */
5802 fn_type = build_function_type (integer_type_node, arg_types);
5803 fn_ptr_type = build_pointer_type (fn_type);
5804 if (use_aeabi_atexit)
5805 name = "__aeabi_atexit";
5807 name = "__cxa_atexit";
5811 /* The declaration for `atexit' is:
5813 int atexit (void (*)());
5815 We build up the argument types and then then function type
5817 fn_ptr_type = get_atexit_fn_ptr_type ();
5818 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5819 /* Build the final atexit type. */
5820 fn_type = build_function_type (integer_type_node, arg_types);
5824 /* Now, build the function declaration. */
5825 push_lang_context (lang_name_c);
5826 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5827 mark_used (atexit_fndecl);
5828 pop_lang_context ();
5829 atexit_node = decay_conversion (atexit_fndecl);
5834 /* Returns the __dso_handle VAR_DECL. */
5837 get_dso_handle_node (void)
5839 if (dso_handle_node)
5840 return dso_handle_node;
5842 /* Declare the variable. */
5843 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5846 return dso_handle_node;
5849 /* Begin a new function with internal linkage whose job will be simply
5850 to destroy some particular variable. */
5852 static GTY(()) int start_cleanup_cnt;
5855 start_cleanup_fn (void)
5860 bool use_cxa_atexit = flag_use_cxa_atexit
5861 && !targetm.cxx.use_atexit_for_cxa_atexit ();
5863 push_to_top_level ();
5865 /* No need to mangle this. */
5866 push_lang_context (lang_name_c);
5868 /* Build the name of the function. */
5869 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
5870 /* Build the function declaration. */
5871 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
5872 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
5873 /* It's a function with internal linkage, generated by the
5875 TREE_PUBLIC (fndecl) = 0;
5876 DECL_ARTIFICIAL (fndecl) = 1;
5877 /* Make the function `inline' so that it is only emitted if it is
5878 actually needed. It is unlikely that it will be inlined, since
5879 it is only called via a function pointer, but we avoid unnecessary
5880 emissions this way. */
5881 DECL_INLINE (fndecl) = 1;
5882 DECL_DECLARED_INLINE_P (fndecl) = 1;
5883 DECL_INTERFACE_KNOWN (fndecl) = 1;
5884 /* Build the parameter. */
5889 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
5890 DECL_CONTEXT (parmdecl) = fndecl;
5891 TREE_USED (parmdecl) = 1;
5892 DECL_ARGUMENTS (fndecl) = parmdecl;
5896 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
5898 pop_lang_context ();
5900 return current_function_decl;
5903 /* Finish the cleanup function begun by start_cleanup_fn. */
5906 end_cleanup_fn (void)
5908 expand_or_defer_fn (finish_function (0));
5910 pop_from_top_level ();
5913 /* Generate code to handle the destruction of DECL, an object with
5914 static storage duration. */
5917 register_dtor_fn (tree decl)
5926 type = TREE_TYPE (decl);
5927 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
5928 return void_zero_node;
5930 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
5931 a class object, we can just pass the destructor to
5932 "__cxa_atexit"; we don't have to build a temporary function to do
5934 use_dtor = (flag_use_cxa_atexit
5935 && !targetm.cxx.use_atexit_for_cxa_atexit ()
5936 && CLASS_TYPE_P (type));
5941 /* Find the destructor. */
5942 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
5943 gcc_assert (idx >= 0);
5944 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
5945 /* Make sure it is accessible. */
5946 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
5950 /* Call build_cleanup before we enter the anonymous function so
5951 that any access checks will be done relative to the current
5952 scope, rather than the scope of the anonymous function. */
5953 build_cleanup (decl);
5955 /* Now start the function. */
5956 cleanup = start_cleanup_fn ();
5958 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
5959 to the original function, rather than the anonymous one. That
5960 will make the back end think that nested functions are in use,
5961 which causes confusion. */
5962 push_deferring_access_checks (dk_no_check);
5963 fcall = build_cleanup (decl);
5964 pop_deferring_access_checks ();
5966 /* Create the body of the anonymous function. */
5967 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
5968 finish_expr_stmt (fcall);
5969 finish_compound_stmt (compound_stmt);
5973 /* Call atexit with the cleanup function. */
5974 mark_used (cleanup);
5975 cleanup = build_address (cleanup);
5976 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5982 /* We must convert CLEANUP to the type that "__cxa_atexit"
5984 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
5985 /* "__cxa_atexit" will pass the address of DECL to the
5986 cleanup function. */
5988 addr = build_address (decl);
5989 /* The declared type of the parameter to "__cxa_atexit" is
5990 "void *". For plain "T*", we could just let the
5991 machinery in build_function_call convert it -- but if the
5992 type is "cv-qualified T *", then we need to convert it
5993 before passing it in, to avoid spurious errors. */
5994 addr = build_nop (ptr_type_node, addr);
5997 /* Since the cleanup functions we build ignore the address
5998 they're given, there's no reason to pass the actual address
5999 in, and, in general, it's cheaper to pass NULL than any
6001 addr = null_pointer_node;
6002 args = tree_cons (NULL_TREE,
6003 build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0),
6005 if (targetm.cxx.use_aeabi_atexit ())
6007 args = tree_cons (NULL_TREE, cleanup, args);
6008 args = tree_cons (NULL_TREE, addr, args);
6012 args = tree_cons (NULL_TREE, addr, args);
6013 args = tree_cons (NULL_TREE, cleanup, args);
6017 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6018 return build_function_call (get_atexit_node (), args);
6021 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6022 is its initializer. Generate code to handle the construction
6023 and destruction of DECL. */
6026 expand_static_init (tree decl, tree init)
6028 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6029 gcc_assert (TREE_STATIC (decl));
6031 /* Some variables require no initialization. */
6033 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6034 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6037 if (DECL_FUNCTION_SCOPE_P (decl))
6039 /* Emit code to perform this initialization but once. */
6040 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6041 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6042 tree guard, guard_addr;
6043 tree acquire_fn, release_fn, abort_fn;
6046 /* Emit code to perform this initialization but once. This code
6049 static <type> guard;
6050 if (!guard.first_byte) {
6051 if (__cxa_guard_acquire (&guard)) {
6054 // Do initialization.
6055 flag = true; __cxa_guard_release (&guard);
6056 // Register variable for destruction at end of program.
6058 if (!flag) __cxa_guard_abort (&guard);
6062 Note that the `flag' variable is only set to 1 *after* the
6063 initialization is complete. This ensures that an exception,
6064 thrown during the construction, will cause the variable to
6065 reinitialized when we pass through this code again, as per:
6069 If the initialization exits by throwing an exception, the
6070 initialization is not complete, so it will be tried again
6071 the next time control enters the declaration.
6073 This process should be thread-safe, too; multiple threads
6074 should not be able to initialize the variable more than
6077 /* Create the guard variable. */
6078 guard = get_guard (decl);
6080 /* This optimization isn't safe on targets with relaxed memory
6081 consistency. On such targets we force synchronization in
6082 __cxa_guard_acquire. */
6083 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6085 /* Begin the conditional initialization. */
6086 if_stmt = begin_if_stmt ();
6087 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6088 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6091 if (flag_threadsafe_statics)
6093 guard_addr = build_address (guard);
6095 acquire_fn = get_identifier ("__cxa_guard_acquire");
6096 release_fn = get_identifier ("__cxa_guard_release");
6097 abort_fn = get_identifier ("__cxa_guard_abort");
6098 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6100 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6102 tree vfntype = build_function_type (void_type_node, argtypes);
6103 acquire_fn = push_library_fn
6104 (acquire_fn, build_function_type (integer_type_node, argtypes));
6105 release_fn = push_library_fn (release_fn, vfntype);
6106 abort_fn = push_library_fn (abort_fn, vfntype);
6110 release_fn = identifier_global_value (release_fn);
6111 abort_fn = identifier_global_value (abort_fn);
6114 inner_if_stmt = begin_if_stmt ();
6115 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6118 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6119 begin = get_target_expr (boolean_false_node);
6120 flag = TARGET_EXPR_SLOT (begin);
6122 TARGET_EXPR_CLEANUP (begin)
6123 = build3 (COND_EXPR, void_type_node, flag,
6125 build_call_n (abort_fn, 1, guard_addr));
6126 CLEANUP_EH_ONLY (begin) = 1;
6128 /* Do the initialization itself. */
6129 init = add_stmt_to_compound (begin, init);
6130 init = add_stmt_to_compound
6131 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6132 init = add_stmt_to_compound
6133 (init, build_call_n (release_fn, 1, guard_addr));
6136 init = add_stmt_to_compound (init, set_guard (guard));
6138 /* Use atexit to register a function for destroying this static
6140 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6142 finish_expr_stmt (init);
6144 if (flag_threadsafe_statics)
6146 finish_compound_stmt (inner_then_clause);
6147 finish_then_clause (inner_if_stmt);
6148 finish_if_stmt (inner_if_stmt);
6151 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6153 finish_compound_stmt (then_clause);
6154 finish_then_clause (if_stmt);
6155 finish_if_stmt (if_stmt);
6159 static_aggregates = tree_cons (init, decl, static_aggregates);
6163 /* Make TYPE a complete type based on INITIAL_VALUE.
6164 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6165 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6166 3 if the initializer list is empty (in pedantic mode). */
6169 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6172 tree type, elt_type;
6176 unsigned HOST_WIDE_INT i;
6179 /* An array of character type can be initialized from a
6180 brace-enclosed string constant.
6182 FIXME: this code is duplicated from reshape_init. Probably
6183 we should just call reshape_init here? */
6184 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6185 && TREE_CODE (initial_value) == CONSTRUCTOR
6186 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6188 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6189 tree value = VEC_index (constructor_elt, v, 0)->value;
6191 if (TREE_CODE (value) == STRING_CST
6192 && VEC_length (constructor_elt, v) == 1)
6193 initial_value = value;
6196 /* If any of the elements are parameter packs, we can't actually
6197 complete this type now because the array size is dependent. */
6198 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6200 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6203 if (PACK_EXPANSION_P (value))
6209 failure = complete_array_type (ptype, initial_value, do_default);
6211 /* We can create the array before the element type is complete, which
6212 means that we didn't have these two bits set in the original type
6213 either. In completing the type, we are expected to propagate these
6214 bits. See also complete_type which does the same thing for arrays
6217 if (TYPE_DOMAIN (type))
6219 elt_type = TREE_TYPE (type);
6220 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6221 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6222 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6228 /* Return zero if something is declared to be a member of type
6229 CTYPE when in the context of CUR_TYPE. STRING is the error
6230 message to print in that case. Otherwise, quietly return 1. */
6233 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6235 if (ctype && ctype != cur_type)
6237 if (flags == DTOR_FLAG)
6238 error ("destructor for alien class %qT cannot be a member", ctype);
6240 error ("constructor for alien class %qT cannot be a member", ctype);
6246 /* Subroutine of `grokdeclarator'. */
6248 /* Generate errors possibly applicable for a given set of specifiers.
6249 This is for ARM $7.1.2. */
6252 bad_specifiers (tree object,
6261 error ("%qD declared as a %<virtual%> %s", object, type);
6263 error ("%qD declared as an %<inline%> %s", object, type);
6265 error ("%<const%> and %<volatile%> function specifiers on "
6266 "%qD invalid in %s declaration",
6269 error ("%q+D declared as a friend", object);
6271 && (TREE_CODE (object) == TYPE_DECL
6272 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6273 && !TYPE_REFFN_P (TREE_TYPE (object))
6274 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6275 error ("%q+D declared with an exception specification", object);
6278 /* DECL is a member function or static data member and is presently
6279 being defined. Check that the definition is taking place in a
6283 check_class_member_definition_namespace (tree decl)
6285 /* These checks only apply to member functions and static data
6287 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6288 || TREE_CODE (decl) == VAR_DECL);
6289 /* We check for problems with specializations in pt.c in
6290 check_specialization_namespace, where we can issue better
6292 if (processing_specialization)
6294 /* There are no restrictions on the placement of
6295 explicit instantiations. */
6296 if (processing_explicit_instantiation)
6300 A member function definition that appears outside of the
6301 class definition shall appear in a namespace scope enclosing
6302 the class definition.
6306 The definition for a static data member shall appear in a
6307 namespace scope enclosing the member's class definition. */
6308 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6309 pedwarn ("definition of %qD is not in namespace enclosing %qT",
6310 decl, DECL_CONTEXT (decl));
6313 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6314 METHOD_TYPE for a non-static member function; QUALS are the
6315 cv-qualifiers that apply to the function. */
6318 build_this_parm (tree type, cp_cv_quals quals)
6323 cp_cv_quals this_quals;
6325 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6326 /* The `this' parameter is implicitly `const'; it cannot be
6328 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6329 qual_type = cp_build_qualified_type (this_type, this_quals);
6330 parm = build_artificial_parm (this_identifier, qual_type);
6331 cp_apply_type_quals_to_decl (this_quals, parm);
6335 /* CTYPE is class type, or null if non-class.
6336 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6338 DECLARATOR is the function's name.
6339 PARMS is a chain of PARM_DECLs for the function.
6340 VIRTUALP is truthvalue of whether the function is virtual or not.
6341 FLAGS are to be passed through to `grokclassfn'.
6342 QUALS are qualifiers indicating whether the function is `const'
6344 RAISES is a list of exceptions that this function can raise.
6345 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6346 not look, and -1 if we should not call `grokclassfn' at all.
6348 SFK is the kind of special function (if any) for the new function.
6350 Returns `NULL_TREE' if something goes wrong, after issuing
6351 applicable error messages. */
6354 grokfndecl (tree ctype,
6358 tree orig_declarator,
6360 enum overload_flags flags,
6367 special_function_kind sfk,
6374 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6378 type = build_exception_variant (type, raises);
6380 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6381 if (TREE_CODE (type) == METHOD_TYPE)
6384 parm = build_this_parm (type, quals);
6385 TREE_CHAIN (parm) = parms;
6388 DECL_ARGUMENTS (decl) = parms;
6389 /* Propagate volatile out from type to decl. */
6390 if (TYPE_VOLATILE (type))
6391 TREE_THIS_VOLATILE (decl) = 1;
6393 /* Setup decl according to sfk. */
6396 case sfk_constructor:
6397 case sfk_copy_constructor:
6398 DECL_CONSTRUCTOR_P (decl) = 1;
6400 case sfk_destructor:
6401 DECL_DESTRUCTOR_P (decl) = 1;
6407 /* If pointers to member functions use the least significant bit to
6408 indicate whether a function is virtual, ensure a pointer
6409 to this function will have that bit clear. */
6410 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6411 && TREE_CODE (type) == METHOD_TYPE
6412 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6413 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6416 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6420 ("defining explicit specialization %qD in friend declaration",
6424 tree fns = TREE_OPERAND (orig_declarator, 0);
6425 tree args = TREE_OPERAND (orig_declarator, 1);
6427 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6429 /* Something like `template <class T> friend void f<T>()'. */
6430 error ("invalid use of template-id %qD in declaration "
6431 "of primary template",
6437 /* A friend declaration of the form friend void f<>(). Record
6438 the information in the TEMPLATE_ID_EXPR. */
6439 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6441 if (TREE_CODE (fns) == COMPONENT_REF)
6443 /* Due to bison parser ickiness, we will have already looked
6444 up an operator_name or PFUNCNAME within the current class
6445 (see template_id in parse.y). If the current class contains
6446 such a name, we'll get a COMPONENT_REF here. Undo that. */
6448 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6449 == current_class_type);
6450 fns = TREE_OPERAND (fns, 1);
6452 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6453 || TREE_CODE (fns) == OVERLOAD);
6454 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6456 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6457 if (TREE_PURPOSE (t)
6458 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6460 error ("default arguments are not allowed in declaration "
6461 "of friend template specialization %qD",
6468 error ("%<inline%> is not allowed in declaration of friend "
6469 "template specialization %qD",
6476 /* If this decl has namespace scope, set that up. */
6478 set_decl_namespace (decl, in_namespace, friendp);
6480 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6482 /* `main' and builtins have implicit 'C' linkage. */
6483 if ((MAIN_NAME_P (declarator)
6484 || (IDENTIFIER_LENGTH (declarator) > 10
6485 && IDENTIFIER_POINTER (declarator)[0] == '_'
6486 && IDENTIFIER_POINTER (declarator)[1] == '_'
6487 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6488 && current_lang_name == lang_name_cplusplus
6489 && ctype == NULL_TREE
6490 /* NULL_TREE means global namespace. */
6491 && DECL_CONTEXT (decl) == NULL_TREE)
6492 SET_DECL_LANGUAGE (decl, lang_c);
6494 /* Should probably propagate const out from type to decl I bet (mrs). */
6497 DECL_STATIC_FUNCTION_P (decl) = 1;
6498 DECL_CONTEXT (decl) = ctype;
6503 DECL_CONTEXT (decl) = ctype;
6505 check_class_member_definition_namespace (decl);
6508 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6510 if (processing_template_decl)
6511 error ("cannot declare %<::main%> to be a template");
6513 error ("cannot declare %<::main%> to be inline");
6515 error ("cannot declare %<::main%> to be static");
6520 /* Members of anonymous types and local classes have no linkage; make
6521 them internal. If a typedef is made later, this will be changed. */
6522 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6523 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6528 /* [basic.link]: A name with no linkage (notably, the name of a class
6529 or enumeration declared in a local scope) shall not be used to
6530 declare an entity with linkage.
6532 Only check this for public decls for now. See core 319, 389. */
6533 t = no_linkage_check (TREE_TYPE (decl),
6534 /*relaxed_p=*/false);
6537 if (TYPE_ANONYMOUS_P (t))
6539 if (DECL_EXTERN_C_P (decl))
6540 /* Allow this; it's pretty common in C. */;
6543 pedwarn ("non-local function %q#D uses anonymous type",
6545 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6546 pedwarn ("%q+#D does not refer to the unqualified "
6547 "type, so it is not used for linkage",
6552 pedwarn ("non-local function %q#D uses local type %qT", decl, t);
6556 TREE_PUBLIC (decl) = publicp;
6559 DECL_INTERFACE_KNOWN (decl) = 1;
6560 DECL_NOT_REALLY_EXTERN (decl) = 1;
6563 /* If the declaration was declared inline, mark it as such. */
6565 DECL_DECLARED_INLINE_P (decl) = 1;
6566 /* We inline functions that are explicitly declared inline, or, when
6567 the user explicitly asks us to, all functions. */
6568 if (DECL_DECLARED_INLINE_P (decl)
6569 || (flag_inline_trees == 2 && !DECL_INLINE (decl) && funcdef_flag))
6570 DECL_INLINE (decl) = 1;
6572 DECL_EXTERNAL (decl) = 1;
6573 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6576 ? G_("static member function %qD cannot have cv-qualifier")
6577 : G_("non-member function %qD cannot have cv-qualifier"),
6579 quals = TYPE_UNQUALIFIED;
6582 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6583 && !grok_op_properties (decl, /*complain=*/true))
6586 if (ctype && decl_function_context (decl))
6587 DECL_NO_STATIC_CHAIN (decl) = 1;
6590 /* Make the init_value nonzero so pushdecl knows this is not
6591 tentative. error_mark_node is replaced later with the BLOCK. */
6592 DECL_INITIAL (decl) = error_mark_node;
6594 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6595 TREE_NOTHROW (decl) = 1;
6597 /* Caller will do the rest of this. */
6601 if (ctype != NULL_TREE)
6602 grokclassfn (ctype, decl, flags);
6604 decl = check_explicit_specialization (orig_declarator, decl,
6607 4 * (friendp != 0));
6608 if (decl == error_mark_node)
6613 cplus_decl_attributes (&decl, *attrlist, 0);
6614 *attrlist = NULL_TREE;
6617 /* Check main's type after attributes have been applied. */
6618 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6620 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6623 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6625 error ("%<::main%> must return %<int%>");
6626 newtype = build_function_type (integer_type_node, oldtypeargs);
6627 TREE_TYPE (decl) = newtype;
6629 check_main_parameter_types (decl);
6632 if (ctype != NULL_TREE
6633 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6636 tree old_decl = check_classfn (ctype, decl,
6637 (processing_template_decl
6638 > template_class_depth (ctype))
6639 ? current_template_parms
6642 if (old_decl == error_mark_node)
6650 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6651 /* Because grokfndecl is always supposed to return a
6652 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6653 here. We depend on our callers to figure out that its
6654 really a template that's being returned. */
6655 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6657 if (DECL_STATIC_FUNCTION_P (old_decl)
6658 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6659 /* Remove the `this' parm added by grokclassfn.
6660 XXX Isn't this done in start_function, too? */
6661 revert_static_member_fn (decl);
6662 if (DECL_ARTIFICIAL (old_decl))
6664 error ("definition of implicitly-declared %qD", old_decl);
6668 /* Since we've smashed OLD_DECL to its
6669 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6670 if (TREE_CODE (decl) == TEMPLATE_DECL)
6671 decl = DECL_TEMPLATE_RESULT (decl);
6673 /* Attempt to merge the declarations. This can fail, in
6674 the case of some invalid specialization declarations. */
6675 pushed_scope = push_scope (ctype);
6676 ok = duplicate_decls (decl, old_decl, friendp);
6678 pop_scope (pushed_scope);
6681 error ("no %q#D member function declared in class %qT",
6689 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6692 if (ctype == NULL_TREE || check)
6696 DECL_VIRTUAL_P (decl) = 1;
6701 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6702 the linkage that DECL will receive in the object file. */
6705 set_linkage_for_static_data_member (tree decl)
6707 /* A static data member always has static storage duration and
6708 external linkage. Note that static data members are forbidden in
6709 local classes -- the only situation in which a class has
6710 non-external linkage. */
6711 TREE_PUBLIC (decl) = 1;
6712 TREE_STATIC (decl) = 1;
6713 /* For non-template classes, static data members are always put
6714 out in exactly those files where they are defined, just as
6715 with ordinary namespace-scope variables. */
6716 if (!processing_template_decl)
6717 DECL_INTERFACE_KNOWN (decl) = 1;
6720 /* Create a VAR_DECL named NAME with the indicated TYPE.
6722 If SCOPE is non-NULL, it is the class type or namespace containing
6723 the variable. If SCOPE is NULL, the variable should is created in
6724 the innermost enclosings scope. */
6727 grokvardecl (tree type,
6729 const cp_decl_specifier_seq *declspecs,
6735 tree explicit_scope;
6737 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6739 /* Compute the scope in which to place the variable, but remember
6740 whether or not that scope was explicitly specified by the user. */
6741 explicit_scope = scope;
6744 /* An explicit "extern" specifier indicates a namespace-scope
6746 if (declspecs->storage_class == sc_extern)
6747 scope = current_namespace;
6748 else if (!at_function_scope_p ())
6749 scope = current_scope ();
6753 && (/* If the variable is a namespace-scope variable declared in a
6754 template, we need DECL_LANG_SPECIFIC. */
6755 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6756 /* Similarly for namespace-scope variables with language linkage
6758 || (TREE_CODE (scope) == NAMESPACE_DECL
6759 && current_lang_name != lang_name_cplusplus)
6760 /* Similarly for static data members. */
6762 decl = build_lang_decl (VAR_DECL, name, type);
6764 decl = build_decl (VAR_DECL, name, type);
6766 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6767 set_decl_namespace (decl, explicit_scope, 0);
6769 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6771 if (declspecs->storage_class == sc_extern)
6773 DECL_THIS_EXTERN (decl) = 1;
6774 DECL_EXTERNAL (decl) = !initialized;
6777 if (DECL_CLASS_SCOPE_P (decl))
6779 set_linkage_for_static_data_member (decl);
6780 /* This function is only called with out-of-class definitions. */
6781 DECL_EXTERNAL (decl) = 0;
6782 check_class_member_definition_namespace (decl);
6784 /* At top level, either `static' or no s.c. makes a definition
6785 (perhaps tentative), and absence of `static' makes it public. */
6786 else if (toplevel_bindings_p ())
6788 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6789 && (DECL_THIS_EXTERN (decl) || ! constp));
6790 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6792 /* Not at top level, only `static' makes a static definition. */
6795 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6796 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6799 if (declspecs->specs[(int)ds_thread])
6800 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6802 if (TREE_PUBLIC (decl))
6804 /* [basic.link]: A name with no linkage (notably, the name of a class
6805 or enumeration declared in a local scope) shall not be used to
6806 declare an entity with linkage.
6808 Only check this for public decls for now. */
6809 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6812 if (TYPE_ANONYMOUS_P (t))
6814 if (DECL_EXTERN_C_P (decl))
6815 /* Allow this; it's pretty common in C. */
6819 /* DRs 132, 319 and 389 seem to indicate types with
6820 no linkage can only be used to declare extern "C"
6821 entities. Since it's not always an error in the
6822 ISO C++ 90 Standard, we only issue a warning. */
6823 warning (0, "non-local variable %q#D uses anonymous type",
6825 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6826 warning (0, "%q+#D does not refer to the unqualified "
6827 "type, so it is not used for linkage",
6832 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6836 DECL_INTERFACE_KNOWN (decl) = 1;
6841 /* Create and return a canonical pointer to member function type, for
6842 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6845 build_ptrmemfunc_type (tree type)
6849 tree unqualified_variant = NULL_TREE;
6851 if (type == error_mark_node)
6854 /* If a canonical type already exists for this type, use it. We use
6855 this method instead of type_hash_canon, because it only does a
6856 simple equality check on the list of field members. */
6858 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
6861 /* Make sure that we always have the unqualified pointer-to-member
6863 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6865 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
6867 t = make_aggr_type (RECORD_TYPE);
6868 xref_basetypes (t, NULL_TREE);
6870 /* Let the front end know this is a pointer to member function... */
6871 TYPE_PTRMEMFUNC_FLAG (t) = 1;
6872 /* ... and not really an aggregate. */
6873 SET_IS_AGGR_TYPE (t, 0);
6875 field = build_decl (FIELD_DECL, pfn_identifier, type);
6878 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
6879 TREE_CHAIN (field) = fields;
6882 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
6884 /* Zap out the name so that the back end will give us the debugging
6885 information for this anonymous RECORD_TYPE. */
6886 TYPE_NAME (t) = NULL_TREE;
6888 /* If this is not the unqualified form of this pointer-to-member
6889 type, set the TYPE_MAIN_VARIANT for this type to be the
6890 unqualified type. Since they are actually RECORD_TYPEs that are
6891 not variants of each other, we must do this manually. */
6892 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
6894 t = build_qualified_type (t, cp_type_quals (type));
6895 TYPE_MAIN_VARIANT (t) = unqualified_variant;
6896 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
6897 TYPE_NEXT_VARIANT (unqualified_variant) = t;
6900 /* Cache this pointer-to-member type so that we can find it again
6902 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
6904 /* Managing canonical types for the RECORD_TYPE behind a
6905 pointer-to-member function is a nightmare, so use structural
6906 equality for now. */
6907 SET_TYPE_STRUCTURAL_EQUALITY (t);
6912 /* Create and return a pointer to data member type. */
6915 build_ptrmem_type (tree class_type, tree member_type)
6917 if (TREE_CODE (member_type) == METHOD_TYPE)
6921 arg_types = TYPE_ARG_TYPES (member_type);
6922 class_type = (cp_build_qualified_type
6924 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
6926 = build_method_type_directly (class_type,
6927 TREE_TYPE (member_type),
6928 TREE_CHAIN (arg_types));
6929 return build_ptrmemfunc_type (build_pointer_type (member_type));
6933 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
6934 return build_offset_type (class_type, member_type);
6938 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
6939 Check to see that the definition is valid. Issue appropriate error
6940 messages. Return 1 if the definition is particularly bad, or 0
6944 check_static_variable_definition (tree decl, tree type)
6946 /* Motion 10 at San Diego: If a static const integral data member is
6947 initialized with an integral constant expression, the initializer
6948 may appear either in the declaration (within the class), or in
6949 the definition, but not both. If it appears in the class, the
6950 member is a member constant. The file-scope definition is always
6952 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
6954 error ("invalid in-class initialization of static data member "
6955 "of non-integral type %qT",
6957 /* If we just return the declaration, crashes will sometimes
6958 occur. We therefore return void_type_node, as if this were a
6959 friend declaration, to cause callers to completely ignore
6960 this declaration. */
6963 else if (!CP_TYPE_CONST_P (type))
6964 error ("ISO C++ forbids in-class initialization of non-const "
6965 "static member %qD",
6967 else if (pedantic && !INTEGRAL_TYPE_P (type))
6968 pedwarn ("ISO C++ forbids initialization of member constant "
6969 "%qD of non-integral type %qT", decl, type);
6974 /* Given the SIZE (i.e., number of elements) in an array, compute an
6975 appropriate index type for the array. If non-NULL, NAME is the
6976 name of the thing being declared. */
6979 compute_array_index_type (tree name, tree size)
6983 tree abi_1_itype = NULL_TREE;
6985 if (error_operand_p (size))
6986 return error_mark_node;
6988 type = TREE_TYPE (size);
6989 /* The array bound must be an integer type. */
6990 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
6993 error ("size of array %qD has non-integral type %qT", name, type);
6995 error ("size of array has non-integral type %qT", type);
6996 size = integer_one_node;
6997 type = TREE_TYPE (size);
7000 if (value_dependent_expression_p (size))
7002 /* We cannot do any checking for a value-dependent SIZE. Just
7003 build the index type and mark that it requires structural
7005 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7006 size, integer_one_node));
7007 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7011 if (!abi_version_at_least (2) && processing_template_decl)
7012 /* For abi-1, we handled all instances in templates the same way,
7013 even when they were non-dependent. This effects the manglings
7014 produced. So, we do the normal checking for non-dependent
7015 sizes, but at the end we'll return the same type that abi-1
7016 would have, but with TYPE_CANONICAL set to the "right"
7017 value that the current ABI would provide. */
7018 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7019 size, integer_one_node));
7021 /* The size might be the result of a cast. */
7022 STRIP_TYPE_NOPS (size);
7024 /* It might be a const variable or enumeration constant. */
7025 size = integral_constant_value (size);
7027 /* Normally, the array-bound will be a constant. */
7028 if (TREE_CODE (size) == INTEGER_CST)
7030 /* Check to see if the array bound overflowed. Make that an
7031 error, no matter how generous we're being. */
7032 int old_flag_pedantic_errors = flag_pedantic_errors;
7033 int old_pedantic = pedantic;
7034 pedantic = flag_pedantic_errors = 1;
7035 constant_expression_warning (size);
7036 pedantic = old_pedantic;
7037 flag_pedantic_errors = old_flag_pedantic_errors;
7039 /* An array must have a positive number of elements. */
7040 if (INT_CST_LT (size, integer_zero_node))
7043 error ("size of array %qD is negative", name);
7045 error ("size of array is negative");
7046 size = integer_one_node;
7048 /* As an extension we allow zero-sized arrays. We always allow
7049 them in system headers because glibc uses them. */
7050 else if (integer_zerop (size) && pedantic && !in_system_header)
7053 pedwarn ("ISO C++ forbids zero-size array %qD", name);
7055 pedwarn ("ISO C++ forbids zero-size array");
7058 else if (TREE_CONSTANT (size))
7060 /* `(int) &fn' is not a valid array bound. */
7062 error ("size of array %qD is not an integral constant-expression",
7065 error ("size of array is not an integral constant-expression");
7066 size = integer_one_node;
7068 else if (pedantic && warn_vla != 0)
7071 pedwarn ("ISO C++ forbids variable length array %qD", name);
7073 pedwarn ("ISO C++ forbids variable length array");
7075 else if (warn_vla > 0)
7079 "variable length array %qD is used", name);
7082 "variable length array is used");
7085 if (processing_template_decl && !TREE_CONSTANT (size))
7086 /* A variable sized array. */
7087 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7090 HOST_WIDE_INT saved_processing_template_decl;
7092 /* Compute the index of the largest element in the array. It is
7093 one less than the number of elements in the array. We save
7094 and restore PROCESSING_TEMPLATE_DECL so that computations in
7095 cp_build_binary_op will be appropriately folded. */
7096 saved_processing_template_decl = processing_template_decl;
7097 processing_template_decl = 0;
7098 itype = cp_build_binary_op (MINUS_EXPR,
7099 cp_convert (ssizetype, size),
7100 cp_convert (ssizetype, integer_one_node));
7101 itype = fold (itype);
7102 processing_template_decl = saved_processing_template_decl;
7104 if (!TREE_CONSTANT (itype))
7105 /* A variable sized array. */
7106 itype = variable_size (itype);
7107 /* Make sure that there was no overflow when creating to a signed
7108 index type. (For example, on a 32-bit machine, an array with
7109 size 2^32 - 1 is too big.) */
7110 else if (TREE_CODE (itype) == INTEGER_CST
7111 && TREE_OVERFLOW (itype))
7113 error ("overflow in array dimension");
7114 TREE_OVERFLOW (itype) = 0;
7118 /* Create and return the appropriate index type. */
7121 tree t = build_index_type (itype);
7122 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7126 return build_index_type (itype);
7129 /* Returns the scope (if any) in which the entity declared by
7130 DECLARATOR will be located. If the entity was declared with an
7131 unqualified name, NULL_TREE is returned. */
7134 get_scope_of_declarator (const cp_declarator *declarator)
7136 while (declarator && declarator->kind != cdk_id)
7137 declarator = declarator->declarator;
7139 /* If the declarator-id is a SCOPE_REF, the scope in which the
7140 declaration occurs is the first operand. */
7142 && declarator->u.id.qualifying_scope)
7143 return declarator->u.id.qualifying_scope;
7145 /* Otherwise, the declarator is not a qualified name; the entity will
7146 be declared in the current scope. */
7150 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7151 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7155 create_array_type_for_decl (tree name, tree type, tree size)
7157 tree itype = NULL_TREE;
7158 const char* error_msg;
7160 /* If things have already gone awry, bail now. */
7161 if (type == error_mark_node || size == error_mark_node)
7162 return error_mark_node;
7164 /* Assume that everything will go OK. */
7167 /* There are some types which cannot be array elements. */
7168 switch (TREE_CODE (type))
7171 error_msg = "array of void";
7175 error_msg = "array of functions";
7178 case REFERENCE_TYPE:
7179 error_msg = "array of references";
7183 error_msg = "array of function members";
7190 /* If something went wrong, issue an error-message and return. */
7194 error ("declaration of %qD as %s", name, error_msg);
7196 error ("creating %s", error_msg);
7198 return error_mark_node;
7203 The constant expressions that specify the bounds of the arrays
7204 can be omitted only for the first member of the sequence. */
7205 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7208 error ("declaration of %qD as multidimensional array must "
7209 "have bounds for all dimensions except the first",
7212 error ("multidimensional array must have bounds for all "
7213 "dimensions except the first");
7215 return error_mark_node;
7218 /* Figure out the index type for the array. */
7220 itype = compute_array_index_type (name, size);
7223 T is called the array element type; this type shall not be [...] an
7224 abstract class type. */
7225 abstract_virtuals_error (name, type);
7227 return build_cplus_array_type (type, itype);
7230 /* Check that it's OK to declare a function with the indicated TYPE.
7231 SFK indicates the kind of special function (if any) that this
7232 function is. OPTYPE is the type given in a conversion operator
7233 declaration, or the class type for a constructor/destructor.
7234 Returns the actual return type of the function; that
7235 may be different than TYPE if an error occurs, or for certain
7236 special functions. */
7239 check_special_function_return_type (special_function_kind sfk,
7245 case sfk_constructor:
7247 error ("return type specification for constructor invalid");
7249 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7250 type = build_pointer_type (optype);
7252 type = void_type_node;
7255 case sfk_destructor:
7257 error ("return type specification for destructor invalid");
7258 /* We can't use the proper return type here because we run into
7259 problems with ambiguous bases and covariant returns.
7260 Java classes are left unchanged because (void *) isn't a valid
7261 Java type, and we don't want to change the Java ABI. */
7262 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7263 type = build_pointer_type (void_type_node);
7265 type = void_type_node;
7268 case sfk_conversion:
7270 error ("return type specified for %<operator %T%>", optype);
7281 /* A variable or data member (whose unqualified name is IDENTIFIER)
7282 has been declared with the indicated TYPE. If the TYPE is not
7283 acceptable, issue an error message and return a type to use for
7284 error-recovery purposes. */
7287 check_var_type (tree identifier, tree type)
7289 if (VOID_TYPE_P (type))
7292 error ("unnamed variable or field declared void");
7293 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7295 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7296 error ("variable or field %qE declared void", identifier);
7299 error ("variable or field declared void");
7300 type = error_mark_node;
7306 /* Given declspecs and a declarator (abstract or otherwise), determine
7307 the name and type of the object declared and construct a DECL node
7310 DECLSPECS points to the representation of declaration-specifier
7311 sequence that precedes declarator.
7313 DECL_CONTEXT says which syntactic context this declaration is in:
7314 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7315 FUNCDEF for a function definition. Like NORMAL but a few different
7316 error messages in each case. Return value may be zero meaning
7317 this definition is too screwy to try to parse.
7318 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7319 handle member functions (which have FIELD context).
7320 Return value may be zero meaning this definition is too screwy to
7322 PARM for a parameter declaration (either within a function prototype
7323 or before a function body). Make a PARM_DECL, or return void_type_node.
7324 CATCHPARM for a parameter declaration before a catch clause.
7325 TYPENAME if for a typename (in a cast or sizeof).
7326 Don't make a DECL node; just return the ..._TYPE node.
7327 FIELD for a struct or union field; make a FIELD_DECL.
7328 BITFIELD for a field with specified width.
7329 INITIALIZED is 1 if the decl has an initializer.
7331 ATTRLIST is a pointer to the list of attributes, which may be NULL
7332 if there are none; *ATTRLIST may be modified if attributes from inside
7333 the declarator should be applied to the declaration.
7335 When this function is called, scoping variables (such as
7336 CURRENT_CLASS_TYPE) should reflect the scope in which the
7337 declaration occurs, not the scope in which the new declaration will
7338 be placed. For example, on:
7342 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7345 Returns a DECL (if a declarator is present), a TYPE (if there is no
7346 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7350 grokdeclarator (const cp_declarator *declarator,
7351 const cp_decl_specifier_seq *declspecs,
7352 enum decl_context decl_context,
7356 tree type = NULL_TREE;
7358 int virtualp, explicitp, friendp, inlinep, staticp;
7359 int explicit_int = 0;
7360 int explicit_char = 0;
7361 int defaulted_int = 0;
7362 tree dependent_name = NULL_TREE;
7364 tree typedef_decl = NULL_TREE;
7365 const char *name = NULL;
7366 tree typedef_type = NULL_TREE;
7367 /* True if this declarator is a function definition. */
7368 bool funcdef_flag = false;
7369 cp_declarator_kind innermost_code = cdk_error;
7372 /* See the code below that used this. */
7373 tree decl_attr = NULL_TREE;
7376 /* Keep track of what sort of function is being processed
7377 so that we can warn about default return values, or explicit
7378 return values which do not match prescribed defaults. */
7379 special_function_kind sfk = sfk_none;
7381 tree dname = NULL_TREE;
7382 tree ctor_return_type = NULL_TREE;
7383 enum overload_flags flags = NO_SPECIAL;
7384 /* cv-qualifiers that apply to the declarator, for a declaration of
7385 a member function. */
7386 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7387 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7389 tree raises = NULL_TREE;
7390 int template_count = 0;
7391 tree returned_attrs = NULL_TREE;
7392 tree parms = NULL_TREE;
7393 const cp_declarator *id_declarator;
7394 /* The unqualified name of the declarator; either an
7395 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7396 tree unqualified_id;
7397 /* The class type, if any, in which this entity is located,
7398 or NULL_TREE if none. Note that this value may be different from
7399 the current class type; for example if an attempt is made to declare
7400 "A::f" inside "B", this value will be "A". */
7401 tree ctype = current_class_type;
7402 /* The NAMESPACE_DECL for the namespace in which this entity is
7403 located. If an unqualified name is used to declare the entity,
7404 this value will be NULL_TREE, even if the entity is located at
7406 tree in_namespace = NULL_TREE;
7407 cp_storage_class storage_class;
7408 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7409 bool type_was_error_mark_node = false;
7410 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7411 bool set_no_warning = false;
7413 signed_p = declspecs->specs[(int)ds_signed];
7414 unsigned_p = declspecs->specs[(int)ds_unsigned];
7415 short_p = declspecs->specs[(int)ds_short];
7416 long_p = declspecs->specs[(int)ds_long];
7417 longlong = declspecs->specs[(int)ds_long] >= 2;
7418 thread_p = declspecs->specs[(int)ds_thread];
7420 if (decl_context == FUNCDEF)
7421 funcdef_flag = true, decl_context = NORMAL;
7422 else if (decl_context == MEMFUNCDEF)
7423 funcdef_flag = true, decl_context = FIELD;
7424 else if (decl_context == BITFIELD)
7425 bitfield = 1, decl_context = FIELD;
7427 /* Look inside a declarator for the name being declared
7428 and get it as a string, for an error message. */
7429 for (id_declarator = declarator;
7431 id_declarator = id_declarator->declarator)
7433 if (id_declarator->kind != cdk_id)
7434 innermost_code = id_declarator->kind;
7436 switch (id_declarator->kind)
7439 if (id_declarator->declarator
7440 && id_declarator->declarator->kind == cdk_id)
7442 sfk = id_declarator->declarator->u.id.sfk;
7443 if (sfk == sfk_destructor)
7450 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7451 tree decl = id_declarator->u.id.unqualified_name;
7454 if (qualifying_scope)
7456 if (at_function_scope_p ())
7460 A declarator-id shall not be qualified except
7463 None of the cases are permitted in block
7465 if (qualifying_scope == global_namespace)
7466 error ("invalid use of qualified-name %<::%D%>",
7468 else if (TYPE_P (qualifying_scope))
7469 error ("invalid use of qualified-name %<%T::%D%>",
7470 qualifying_scope, decl);
7472 error ("invalid use of qualified-name %<%D::%D%>",
7473 qualifying_scope, decl);
7474 return error_mark_node;
7476 else if (TYPE_P (qualifying_scope))
7478 ctype = qualifying_scope;
7479 if (innermost_code != cdk_function
7480 && current_class_type
7481 && !UNIQUELY_DERIVED_FROM_P (ctype,
7482 current_class_type))
7484 error ("type %qT is not derived from type %qT",
7485 ctype, current_class_type);
7486 return error_mark_node;
7489 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7490 in_namespace = qualifying_scope;
7492 switch (TREE_CODE (decl))
7498 if (innermost_code != cdk_function)
7500 error ("declaration of %qD as non-function", decl);
7501 return error_mark_node;
7503 else if (!qualifying_scope
7504 && !(current_class_type && at_class_scope_p ()))
7506 error ("declaration of %qD as non-member", decl);
7507 return error_mark_node;
7510 type = TREE_OPERAND (decl, 0);
7511 name = IDENTIFIER_POINTER (constructor_name (type));
7516 case TEMPLATE_ID_EXPR:
7518 tree fns = TREE_OPERAND (decl, 0);
7521 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7523 gcc_assert (is_overloaded_fn (dname));
7524 dname = DECL_NAME (get_first_fn (dname));
7529 case IDENTIFIER_NODE:
7530 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7533 if (C_IS_RESERVED_WORD (dname))
7535 error ("declarator-id missing; using reserved word %qD",
7537 name = IDENTIFIER_POINTER (dname);
7539 else if (!IDENTIFIER_TYPENAME_P (dname))
7540 name = IDENTIFIER_POINTER (dname);
7543 gcc_assert (flags == NO_SPECIAL);
7544 flags = TYPENAME_FLAG;
7545 ctor_return_type = TREE_TYPE (dname);
7546 sfk = sfk_conversion;
7547 if (is_typename_at_global_scope (dname))
7548 name = IDENTIFIER_POINTER (dname);
7550 name = "<invalid operator>";
7567 return error_mark_node;
7572 if (id_declarator->kind == cdk_id)
7578 The declarator in a function-definition shall have the form
7579 D1 ( parameter-declaration-clause) ... */
7580 if (funcdef_flag && innermost_code != cdk_function)
7582 error ("function definition does not declare parameters");
7583 return error_mark_node;
7586 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7587 && innermost_code != cdk_function
7588 && ! (ctype && !declspecs->any_specifiers_p))
7590 error ("declaration of %qD as non-function", dname);
7591 return error_mark_node;
7594 /* Anything declared one level down from the top level
7595 must be one of the parameters of a function
7596 (because the body is at least two levels down). */
7598 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7599 by not allowing C++ class definitions to specify their parameters
7600 with xdecls (must be spec.d in the parmlist).
7602 Since we now wait to push a class scope until we are sure that
7603 we are in a legitimate method context, we must set oldcname
7604 explicitly (since current_class_name is not yet alive).
7606 We also want to avoid calling this a PARM if it is in a namespace. */
7608 if (decl_context == NORMAL && !toplevel_bindings_p ())
7610 struct cp_binding_level *b = current_binding_level;
7611 current_binding_level = b->level_chain;
7612 if (current_binding_level != 0 && toplevel_bindings_p ())
7613 decl_context = PARM;
7614 current_binding_level = b;
7618 name = decl_context == PARM ? "parameter" : "type name";
7620 /* If there were multiple types specified in the decl-specifier-seq,
7621 issue an error message. */
7622 if (declspecs->multiple_types_p)
7624 error ("two or more data types in declaration of %qs", name);
7625 return error_mark_node;
7628 if (declspecs->conflicting_specifiers_p)
7630 error ("conflicting specifiers in declaration of %qs", name);
7631 return error_mark_node;
7634 /* Extract the basic type from the decl-specifier-seq. */
7635 type = declspecs->type;
7636 if (type == error_mark_node)
7639 type_was_error_mark_node = true;
7641 /* If the entire declaration is itself tagged as deprecated then
7642 suppress reports of deprecated items. */
7643 if (type && TREE_DEPRECATED (type)
7644 && deprecated_state != DEPRECATED_SUPPRESS)
7645 warn_deprecated_use (type);
7646 if (type && TREE_CODE (type) == TYPE_DECL)
7648 typedef_decl = type;
7649 type = TREE_TYPE (typedef_decl);
7650 if (TREE_DEPRECATED (type)
7651 && DECL_ARTIFICIAL (typedef_decl)
7652 && deprecated_state != DEPRECATED_SUPPRESS)
7653 warn_deprecated_use (type);
7655 /* No type at all: default to `int', and set DEFAULTED_INT
7656 because it was not a user-defined typedef. */
7657 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7659 /* These imply 'int'. */
7660 type = integer_type_node;
7664 explicit_int = declspecs->explicit_int_p;
7665 explicit_char = declspecs->explicit_char_p;
7668 /* See the code below that used this. */
7670 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7672 typedef_type = type;
7675 if (sfk != sfk_conversion)
7676 ctor_return_type = ctype;
7678 if (sfk != sfk_none)
7679 type = check_special_function_return_type (sfk, type,
7681 else if (type == NULL_TREE)
7687 /* We handle `main' specially here, because 'main () { }' is so
7688 common. With no options, it is allowed. With -Wreturn-type,
7689 it is a warning. It is only an error with -pedantic-errors. */
7690 is_main = (funcdef_flag
7691 && dname && MAIN_NAME_P (dname)
7692 && ctype == NULL_TREE
7693 && in_namespace == NULL_TREE
7694 && current_namespace == global_namespace);
7696 if (type_was_error_mark_node)
7697 /* We've already issued an error, don't complain more. */;
7698 else if (in_system_header || flag_ms_extensions)
7699 /* Allow it, sigh. */;
7700 else if (pedantic || ! is_main)
7701 pedwarn ("ISO C++ forbids declaration of %qs with no type", name);
7703 warning (OPT_Wreturn_type,
7704 "ISO C++ forbids declaration of %qs with no type", name);
7706 type = integer_type_node;
7711 /* Now process the modifiers that were specified
7712 and check for invalid combinations. */
7714 /* Long double is a special combination. */
7715 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7718 type = build_qualified_type (long_double_type_node,
7719 cp_type_quals (type));
7722 /* Check all other uses of type modifiers. */
7724 if (unsigned_p || signed_p || long_p || short_p)
7728 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7729 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7730 else if (signed_p && unsigned_p)
7731 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7732 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7733 error ("%<long long%> invalid for %qs", name);
7734 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7735 error ("%<long%> invalid for %qs", name);
7736 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7737 error ("%<short%> invalid for %qs", name);
7738 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7739 error ("%<long%> or %<short%> invalid for %qs", name);
7740 else if ((long_p || short_p) && explicit_char)
7741 error ("%<long%> or %<short%> specified with char for %qs", name);
7742 else if (long_p && short_p)
7743 error ("%<long%> and %<short%> specified together for %qs", name);
7747 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7749 pedwarn ("long, short, signed or unsigned used invalidly for %qs",
7751 if (flag_pedantic_errors)
7756 /* Discard the type modifiers if they are invalid. */
7767 /* Decide whether an integer type is signed or not.
7768 Optionally treat bitfields as signed by default. */
7772 It is implementation-defined whether a plain (neither
7773 explicitly signed or unsigned) char, short, int, or long
7774 bit-field is signed or unsigned.
7776 Naturally, we extend this to long long as well. Note that
7777 this does not include wchar_t. */
7778 || (bitfield && !flag_signed_bitfields
7780 /* A typedef for plain `int' without `signed' can be
7781 controlled just like plain `int', but a typedef for
7782 `signed int' cannot be so controlled. */
7784 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7785 && TREE_CODE (type) == INTEGER_TYPE
7786 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7789 type = long_long_unsigned_type_node;
7791 type = long_unsigned_type_node;
7793 type = short_unsigned_type_node;
7794 else if (type == char_type_node)
7795 type = unsigned_char_type_node;
7796 else if (typedef_decl)
7797 type = unsigned_type_for (type);
7799 type = unsigned_type_node;
7801 else if (signed_p && type == char_type_node)
7802 type = signed_char_type_node;
7804 type = long_long_integer_type_node;
7806 type = long_integer_type_node;
7808 type = short_integer_type_node;
7810 if (declspecs->specs[(int)ds_complex])
7812 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7813 error ("complex invalid for %qs", name);
7814 /* If we just have "complex", it is equivalent to
7815 "complex double", but if any modifiers at all are specified it is
7816 the complex form of TYPE. E.g, "complex short" is
7817 "complex short int". */
7819 else if (defaulted_int && ! longlong
7820 && ! (long_p || short_p || signed_p || unsigned_p))
7821 type = complex_double_type_node;
7822 else if (type == integer_type_node)
7823 type = complex_integer_type_node;
7824 else if (type == float_type_node)
7825 type = complex_float_type_node;
7826 else if (type == double_type_node)
7827 type = complex_double_type_node;
7828 else if (type == long_double_type_node)
7829 type = complex_long_double_type_node;
7831 type = build_complex_type (type);
7834 type_quals = TYPE_UNQUALIFIED;
7835 if (declspecs->specs[(int)ds_const])
7836 type_quals |= TYPE_QUAL_CONST;
7837 if (declspecs->specs[(int)ds_volatile])
7838 type_quals |= TYPE_QUAL_VOLATILE;
7839 if (declspecs->specs[(int)ds_restrict])
7840 type_quals |= TYPE_QUAL_RESTRICT;
7841 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
7842 error ("qualifiers are not allowed on declaration of %<operator %T%>",
7845 if (TREE_CODE (type) == FUNCTION_TYPE
7846 && type_quals != TYPE_UNQUALIFIED)
7848 /* This was an error in C++98 (cv-qualifiers cannot be added to
7849 a function type), but DR 295 makes the code well-formed by
7850 dropping the extra qualifiers. */
7853 tree bad_type = build_qualified_type (type, type_quals);
7854 pedwarn ("ignoring %qV qualifiers added to function type %qT",
7857 type_quals = TYPE_UNQUALIFIED;
7859 type_quals |= cp_type_quals (type);
7860 type = cp_build_qualified_type_real
7861 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
7862 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
7863 /* We might have ignored or rejected some of the qualifiers. */
7864 type_quals = cp_type_quals (type);
7867 inlinep = !! declspecs->specs[(int)ds_inline];
7868 virtualp = !! declspecs->specs[(int)ds_virtual];
7869 explicitp = !! declspecs->specs[(int)ds_explicit];
7871 storage_class = declspecs->storage_class;
7872 if (storage_class == sc_static)
7873 staticp = 1 + (decl_context == FIELD);
7875 if (virtualp && staticp == 2)
7877 error ("member %qD cannot be declared both virtual and static", dname);
7878 storage_class = sc_none;
7881 friendp = !! declspecs->specs[(int)ds_friend];
7883 if (dependent_name && !friendp)
7885 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
7886 return error_mark_node;
7889 /* Issue errors about use of storage classes for parameters. */
7890 if (decl_context == PARM)
7892 if (declspecs->specs[(int)ds_typedef])
7894 error ("typedef declaration invalid in parameter declaration");
7895 return error_mark_node;
7897 else if (storage_class == sc_static
7898 || storage_class == sc_extern
7900 error ("storage class specifiers invalid in parameter declarations");
7903 /* Give error if `virtual' is used outside of class declaration. */
7905 && (current_class_name == NULL_TREE || decl_context != FIELD))
7907 error ("virtual outside class declaration");
7911 /* Static anonymous unions are dealt with here. */
7912 if (staticp && decl_context == TYPENAME
7914 && ANON_AGGR_TYPE_P (declspecs->type))
7915 decl_context = FIELD;
7917 /* Warn about storage classes that are invalid for certain
7918 kinds of declarations (parameters, typenames, etc.). */
7921 && storage_class != sc_extern
7922 && storage_class != sc_static)
7923 || declspecs->specs[(int)ds_typedef]))
7925 error ("multiple storage classes in declaration of %qs", name);
7928 if (decl_context != NORMAL
7929 && ((storage_class != sc_none
7930 && storage_class != sc_mutable)
7933 if ((decl_context == PARM || decl_context == CATCHPARM)
7934 && (storage_class == sc_register
7935 || storage_class == sc_auto))
7937 else if (declspecs->specs[(int)ds_typedef])
7939 else if (decl_context == FIELD
7940 /* C++ allows static class elements. */
7941 && storage_class == sc_static)
7942 /* C++ also allows inlines and signed and unsigned elements,
7943 but in those cases we don't come in here. */
7947 if (decl_context == FIELD)
7948 error ("storage class specified for %qs", name);
7951 if (decl_context == PARM || decl_context == CATCHPARM)
7952 error ("storage class specified for parameter %qs", name);
7954 error ("storage class specified for typename");
7956 if (storage_class == sc_register
7957 || storage_class == sc_auto
7958 || storage_class == sc_extern
7960 storage_class = sc_none;
7963 else if (storage_class == sc_extern && initialized
7966 if (toplevel_bindings_p ())
7968 /* It's common practice (and completely valid) to have a const
7969 be initialized and declared extern. */
7970 if (!(type_quals & TYPE_QUAL_CONST))
7971 warning (0, "%qs initialized and declared %<extern%>", name);
7974 error ("%qs has both %<extern%> and initializer", name);
7976 else if (storage_class == sc_extern && funcdef_flag
7977 && ! toplevel_bindings_p ())
7978 error ("nested function %qs declared %<extern%>", name);
7979 else if (toplevel_bindings_p ())
7981 if (storage_class == sc_auto)
7982 error ("top-level declaration of %qs specifies %<auto%>", name);
7985 && storage_class != sc_extern
7986 && storage_class != sc_static)
7988 error ("function-scope %qs implicitly auto and declared %<__thread%>",
7993 if (storage_class && friendp)
7994 error ("storage class specifiers invalid in friend function declarations");
7997 unqualified_id = NULL_TREE;
8000 unqualified_id = id_declarator->u.id.unqualified_name;
8001 switch (TREE_CODE (unqualified_id))
8005 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8008 case IDENTIFIER_NODE:
8009 case TEMPLATE_ID_EXPR:
8017 /* Determine the type of the entity declared by recurring on the
8019 for (; declarator; declarator = declarator->declarator)
8021 const cp_declarator *inner_declarator;
8024 if (type == error_mark_node)
8025 return error_mark_node;
8027 attrs = declarator->attributes;
8033 if (declarator == NULL || declarator->kind == cdk_id)
8034 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8035 if (declarator->kind == cdk_function)
8036 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8037 if (declarator->kind == cdk_array)
8038 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8039 returned_attrs = decl_attributes (&type,
8040 chainon (returned_attrs, attrs),
8044 if (declarator->kind == cdk_id)
8047 inner_declarator = declarator->declarator;
8049 switch (declarator->kind)
8052 type = create_array_type_for_decl (dname, type,
8053 declarator->u.array.bounds);
8061 /* Declaring a function type.
8062 Make sure we have a valid type for the function to return. */
8064 if (type_quals != TYPE_UNQUALIFIED)
8066 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8067 warning (OPT_Wignored_qualifiers,
8068 "type qualifiers ignored on function return type");
8069 /* We now know that the TYPE_QUALS don't apply to the
8070 decl, but to its return type. */
8071 type_quals = TYPE_UNQUALIFIED;
8072 set_no_warning = true;
8075 /* Warn about some types functions can't return. */
8077 if (TREE_CODE (type) == FUNCTION_TYPE)
8079 error ("%qs declared as function returning a function", name);
8080 type = integer_type_node;
8082 if (TREE_CODE (type) == ARRAY_TYPE)
8084 error ("%qs declared as function returning an array", name);
8085 type = integer_type_node;
8088 /* Pick up type qualifiers which should be applied to `this'. */
8089 memfn_quals = declarator->u.function.qualifiers;
8091 /* Pick up the exception specifications. */
8092 raises = declarator->u.function.exception_specification;
8094 /* Say it's a definition only for the CALL_EXPR
8095 closest to the identifier. */
8096 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8098 if (ctype == NULL_TREE
8099 && decl_context == FIELD
8101 && (friendp == 0 || dname == current_class_name))
8102 ctype = current_class_type;
8104 if (ctype && (sfk == sfk_constructor
8105 || sfk == sfk_destructor))
8107 /* We are within a class's scope. If our declarator name
8108 is the same as the class name, and we are defining
8109 a function, then it is a constructor/destructor, and
8110 therefore returns a void type. */
8112 /* ISO C++ 12.4/2. A destructor may not be declared
8113 const or volatile. A destructor may not be
8116 ISO C++ 12.1. A constructor may not be declared
8117 const or volatile. A constructor may not be
8118 virtual. A constructor may not be static. */
8120 error ((flags == DTOR_FLAG)
8121 ? "destructor cannot be static member function"
8122 : "constructor cannot be static member function");
8125 error ((flags == DTOR_FLAG)
8126 ? "destructors may not be cv-qualified"
8127 : "constructors may not be cv-qualified");
8128 memfn_quals = TYPE_UNQUALIFIED;
8131 if (decl_context == FIELD
8132 && !member_function_or_else (ctype,
8135 return error_mark_node;
8137 if (flags != DTOR_FLAG)
8139 /* It's a constructor. */
8144 pedwarn ("constructors cannot be declared virtual");
8147 if (decl_context == FIELD
8148 && sfk != sfk_constructor)
8149 return error_mark_node;
8151 if (decl_context == FIELD)
8157 error ("can't initialize friend function %qs", name);
8160 /* Cannot be both friend and virtual. */
8161 error ("virtual functions cannot be friends");
8164 if (decl_context == NORMAL)
8165 error ("friend declaration not in class definition");
8166 if (current_function_decl && funcdef_flag)
8167 error ("can't define friend function %qs in a local "
8172 arg_types = grokparms (declarator->u.function.parameters,
8175 if (inner_declarator
8176 && inner_declarator->kind == cdk_id
8177 && inner_declarator->u.id.sfk == sfk_destructor
8178 && arg_types != void_list_node)
8180 error ("destructors may not have parameters");
8181 arg_types = void_list_node;
8185 type = build_function_type (type, arg_types);
8192 /* Filter out pointers-to-references and references-to-references.
8193 We can get these if a TYPE_DECL is used. */
8195 if (TREE_CODE (type) == REFERENCE_TYPE)
8197 if (declarator->kind != cdk_reference)
8199 error ("cannot declare pointer to %q#T", type);
8200 type = TREE_TYPE (type);
8203 /* In C++0x, we allow reference to reference declarations
8204 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8205 and template type arguments [14.3.1/4 temp.arg.type]. The
8206 check for direct reference to reference declarations, which
8207 are still forbidden, occurs below. Reasoning behind the change
8208 can be found in DR106, DR540, and the rvalue reference
8210 else if (cxx_dialect == cxx98)
8212 error ("cannot declare reference to %q#T", type);
8213 type = TREE_TYPE (type);
8216 else if (VOID_TYPE_P (type))
8218 if (declarator->kind == cdk_reference)
8219 error ("cannot declare reference to %q#T", type);
8220 else if (declarator->kind == cdk_ptrmem)
8221 error ("cannot declare pointer to %q#T member", type);
8224 /* We now know that the TYPE_QUALS don't apply to the decl,
8225 but to the target of the pointer. */
8226 type_quals = TYPE_UNQUALIFIED;
8228 if (declarator->kind == cdk_ptrmem
8229 && (TREE_CODE (type) == FUNCTION_TYPE
8230 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8232 memfn_quals |= cp_type_quals (type);
8233 type = build_memfn_type (type,
8234 declarator->u.pointer.class_type,
8236 memfn_quals = TYPE_UNQUALIFIED;
8239 if (declarator->kind == cdk_reference)
8241 /* In C++0x, the type we are creating a reference to might be
8242 a typedef which is itself a reference type. In that case,
8243 we follow the reference collapsing rules in
8244 [7.1.3/8 dcl.typedef] to create the final reference type:
8246 "If a typedef TD names a type that is a reference to a type
8247 T, an attempt to create the type 'lvalue reference to cv TD'
8248 creates the type 'lvalue reference to T,' while an attempt
8249 to create the type "rvalue reference to cv TD' creates the
8252 if (!VOID_TYPE_P (type))
8253 type = cp_build_reference_type
8254 ((TREE_CODE (type) == REFERENCE_TYPE
8255 ? TREE_TYPE (type) : type),
8256 (declarator->u.reference.rvalue_ref
8257 && (TREE_CODE(type) != REFERENCE_TYPE
8258 || TYPE_REF_IS_RVALUE (type))));
8260 /* In C++0x, we need this check for direct reference to
8261 reference declarations, which are forbidden by
8262 [8.3.2/5 dcl.ref]. Reference to reference declarations
8263 are only allowed indirectly through typedefs and template
8264 type arguments. Example:
8266 void foo(int & &); // invalid ref-to-ref decl
8268 typedef int & int_ref;
8269 void foo(int_ref &); // valid ref-to-ref decl
8271 if (inner_declarator && inner_declarator->kind == cdk_reference)
8272 error ("cannot declare reference to %q#T, which is not "
8273 "a typedef or a template type argument", type);
8275 else if (TREE_CODE (type) == METHOD_TYPE)
8276 type = build_ptrmemfunc_type (build_pointer_type (type));
8277 else if (declarator->kind == cdk_ptrmem)
8279 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8281 if (declarator->u.pointer.class_type == error_mark_node)
8282 /* We will already have complained. */
8283 type = error_mark_node;
8285 type = build_ptrmem_type (declarator->u.pointer.class_type,
8289 type = build_pointer_type (type);
8291 /* Process a list of type modifier keywords (such as
8292 const or volatile) that were given inside the `*' or `&'. */
8294 if (declarator->u.pointer.qualifiers)
8297 = cp_build_qualified_type (type,
8298 declarator->u.pointer.qualifiers);
8299 type_quals = cp_type_quals (type);
8312 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8313 && TREE_CODE (type) != FUNCTION_TYPE
8314 && TREE_CODE (type) != METHOD_TYPE)
8316 error ("template-id %qD used as a declarator",
8318 unqualified_id = dname;
8321 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8322 qualified with a class-name, turn it into a METHOD_TYPE, unless
8323 we know that the function is static. We take advantage of this
8324 opportunity to do other processing that pertains to entities
8325 explicitly declared to be class members. Note that if DECLARATOR
8326 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8327 would not have exited the loop above. */
8329 && declarator->u.id.qualifying_scope
8330 && TYPE_P (declarator->u.id.qualifying_scope))
8334 ctype = declarator->u.id.qualifying_scope;
8335 ctype = TYPE_MAIN_VARIANT (ctype);
8337 while (t != NULL_TREE && CLASS_TYPE_P (t))
8339 /* You're supposed to have one `template <...>' for every
8340 template class, but you don't need one for a full
8341 specialization. For example:
8343 template <class T> struct S{};
8344 template <> struct S<int> { void f(); };
8345 void S<int>::f () {}
8347 is correct; there shouldn't be a `template <>' for the
8348 definition of `S<int>::f'. */
8349 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8350 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8351 /* T is an explicit (not partial) specialization. All
8352 containing classes must therefore also be explicitly
8355 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8356 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8357 template_count += 1;
8359 t = TYPE_MAIN_DECL (t);
8360 t = DECL_CONTEXT (t);
8363 if (ctype == current_class_type)
8367 pedwarn ("member functions are implicitly friends of their class");
8371 pedwarn ("extra qualification %<%T::%> on member %qs",
8374 else if (/* If the qualifying type is already complete, then we
8375 can skip the following checks. */
8376 !COMPLETE_TYPE_P (ctype)
8377 && (/* If the function is being defined, then
8378 qualifying type must certainly be complete. */
8380 /* A friend declaration of "T::f" is OK, even if
8381 "T" is a template parameter. But, if this
8382 function is not a friend, the qualifying type
8384 || (!friendp && !CLASS_TYPE_P (ctype))
8385 /* For a declaration, the type need not be
8386 complete, if either it is dependent (since there
8387 is no meaningful definition of complete in that
8388 case) or the qualifying class is currently being
8390 || !(dependent_type_p (ctype)
8391 || currently_open_class (ctype)))
8392 /* Check that the qualifying type is complete. */
8393 && !complete_type_or_else (ctype, NULL_TREE))
8394 return error_mark_node;
8395 else if (TREE_CODE (type) == FUNCTION_TYPE)
8397 tree sname = declarator->u.id.unqualified_name;
8399 if (current_class_type
8400 && (!friendp || funcdef_flag))
8403 ? "cannot define member function %<%T::%s%> within %<%T%>"
8404 : "cannot declare member function %<%T::%s%> within %<%T%>",
8405 ctype, name, current_class_type);
8406 return error_mark_node;
8409 if (TREE_CODE (sname) == IDENTIFIER_NODE
8410 && NEW_DELETE_OPNAME_P (sname))
8411 /* Overloaded operator new and operator delete
8412 are always static functions. */
8415 type = build_memfn_type (type, ctype, memfn_quals);
8417 else if (declspecs->specs[(int)ds_typedef]
8418 && current_class_type)
8420 error ("cannot declare member %<%T::%s%> within %qT",
8421 ctype, name, current_class_type);
8422 return error_mark_node;
8426 /* Now TYPE has the actual type. */
8431 *attrlist = chainon (returned_attrs, *attrlist);
8433 attrlist = &returned_attrs;
8436 /* Handle parameter packs. */
8437 if (parameter_pack_p)
8439 if (decl_context == PARM)
8440 /* Turn the type into a pack expansion.*/
8441 type = make_pack_expansion (type);
8443 error ("non-parameter %qs cannot be a parameter pack", name);
8446 /* Did array size calculations overflow? */
8448 if (TREE_CODE (type) == ARRAY_TYPE
8449 && COMPLETE_TYPE_P (type)
8450 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8451 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8453 error ("size of array %qs is too large", name);
8454 /* If we proceed with the array type as it is, we'll eventually
8455 crash in tree_low_cst(). */
8456 type = error_mark_node;
8459 if ((decl_context == FIELD || decl_context == PARM)
8460 && !processing_template_decl
8461 && variably_modified_type_p (type, NULL_TREE))
8463 if (decl_context == FIELD)
8464 error ("data member may not have variably modified type %qT", type);
8466 error ("parameter may not have variably modified type %qT", type);
8467 type = error_mark_node;
8470 if (explicitp == 1 || (explicitp && friendp))
8472 /* [dcl.fct.spec] The explicit specifier shall only be used in
8473 declarations of constructors within a class definition. */
8474 error ("only declarations of constructors can be %<explicit%>");
8478 if (storage_class == sc_mutable)
8480 if (decl_context != FIELD || friendp)
8482 error ("non-member %qs cannot be declared %<mutable%>", name);
8483 storage_class = sc_none;
8485 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8487 error ("non-object member %qs cannot be declared %<mutable%>", name);
8488 storage_class = sc_none;
8490 else if (TREE_CODE (type) == FUNCTION_TYPE
8491 || TREE_CODE (type) == METHOD_TYPE)
8493 error ("function %qs cannot be declared %<mutable%>", name);
8494 storage_class = sc_none;
8498 error ("static %qs cannot be declared %<mutable%>", name);
8499 storage_class = sc_none;
8501 else if (type_quals & TYPE_QUAL_CONST)
8503 error ("const %qs cannot be declared %<mutable%>", name);
8504 storage_class = sc_none;
8508 /* If this is declaring a typedef name, return a TYPE_DECL. */
8509 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8513 /* Note that the grammar rejects storage classes
8514 in typenames, fields or parameters. */
8515 if (current_lang_name == lang_name_java)
8516 TYPE_FOR_JAVA (type) = 1;
8518 /* This declaration:
8520 typedef void f(int) const;
8522 declares a function type which is not a member of any
8523 particular class, but which is cv-qualified; for
8524 example "f S::*" declares a pointer to a const-qualified
8525 member function of S. We record the cv-qualification in the
8527 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8529 type = cp_build_qualified_type (type, memfn_quals);
8531 /* We have now dealt with these qualifiers. */
8532 memfn_quals = TYPE_UNQUALIFIED;
8535 if (decl_context == FIELD)
8536 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8538 decl = build_decl (TYPE_DECL, unqualified_id, type);
8539 if (id_declarator && declarator->u.id.qualifying_scope)
8540 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8542 if (decl_context != FIELD)
8544 if (!current_function_decl)
8545 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8546 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8547 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8548 (current_function_decl)))
8549 /* The TYPE_DECL is "abstract" because there will be
8550 clones of this constructor/destructor, and there will
8551 be copies of this TYPE_DECL generated in those
8553 DECL_ABSTRACT (decl) = 1;
8555 else if (constructor_name_p (unqualified_id, current_class_type))
8556 pedwarn ("ISO C++ forbids nested type %qD with same name "
8557 "as enclosing class",
8560 /* If the user declares "typedef struct {...} foo" then the
8561 struct will have an anonymous name. Fill that name in now.
8562 Nothing can refer to it, so nothing needs know about the name
8564 if (type != error_mark_node
8567 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8568 && TYPE_ANONYMOUS_P (type)
8569 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8571 tree oldname = TYPE_NAME (type);
8574 /* Replace the anonymous name with the real name everywhere. */
8575 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8576 if (TYPE_NAME (t) == oldname)
8577 TYPE_NAME (t) = decl;
8579 if (TYPE_LANG_SPECIFIC (type))
8580 TYPE_WAS_ANONYMOUS (type) = 1;
8582 /* If this is a typedef within a template class, the nested
8583 type is a (non-primary) template. The name for the
8584 template needs updating as well. */
8585 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8586 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8587 = TYPE_IDENTIFIER (type);
8589 /* FIXME remangle member functions; member functions of a
8590 type with external linkage have external linkage. */
8594 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8595 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8597 bad_specifiers (decl, "type", virtualp,
8598 memfn_quals != TYPE_UNQUALIFIED,
8599 inlinep, friendp, raises != NULL_TREE);
8604 /* Detect the case of an array type of unspecified size
8605 which came, as such, direct from a typedef name.
8606 We must copy the type, so that the array's domain can be
8607 individually set by the object's initializer. */
8609 if (type && typedef_type
8610 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8611 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8612 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8614 /* Detect where we're using a typedef of function type to declare a
8615 function. PARMS will not be set, so we must create it now. */
8617 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8619 tree decls = NULL_TREE;
8622 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8624 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8626 TREE_CHAIN (decl) = decls;
8630 parms = nreverse (decls);
8632 if (decl_context != TYPENAME)
8634 /* A cv-qualifier-seq shall only be part of the function type
8635 for a non-static member function. [8.3.5/4 dcl.fct] */
8636 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8637 && (current_class_type == NULL_TREE || staticp) )
8640 ? G_("qualified function types cannot be used to "
8641 "declare static member functions")
8642 : G_("qualified function types cannot be used to "
8643 "declare free functions"));
8644 type = TYPE_MAIN_VARIANT (type);
8647 /* The qualifiers on the function type become the qualifiers on
8648 the non-static member function. */
8649 memfn_quals |= cp_type_quals (type);
8653 /* If this is a type name (such as, in a cast or sizeof),
8654 compute the type and return it now. */
8656 if (decl_context == TYPENAME)
8658 /* Note that the grammar rejects storage classes
8659 in typenames, fields or parameters. */
8660 if (type_quals != TYPE_UNQUALIFIED)
8661 type_quals = TYPE_UNQUALIFIED;
8663 /* Special case: "friend class foo" looks like a TYPENAME context. */
8666 if (type_quals != TYPE_UNQUALIFIED)
8668 error ("type qualifiers specified for friend class declaration");
8669 type_quals = TYPE_UNQUALIFIED;
8673 error ("%<inline%> specified for friend class declaration");
8679 /* Don't allow friend declaration without a class-key. */
8680 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8681 pedwarn ("template parameters cannot be friends");
8682 else if (TREE_CODE (type) == TYPENAME_TYPE)
8683 pedwarn ("friend declaration requires class-key, "
8684 "i.e. %<friend class %T::%D%>",
8685 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8687 pedwarn ("friend declaration requires class-key, "
8688 "i.e. %<friend %#T%>",
8692 /* Only try to do this stuff if we didn't already give up. */
8693 if (type != integer_type_node)
8695 /* A friendly class? */
8696 if (current_class_type)
8697 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8700 error ("trying to make class %qT a friend of global scope",
8703 type = void_type_node;
8706 else if (memfn_quals)
8708 if (ctype == NULL_TREE)
8710 if (TREE_CODE (type) != METHOD_TYPE)
8711 error ("invalid qualifiers on non-member function type");
8713 ctype = TYPE_METHOD_BASETYPE (type);
8716 type = build_memfn_type (type, ctype, memfn_quals);
8721 else if (unqualified_id == NULL_TREE && decl_context != PARM
8722 && decl_context != CATCHPARM
8723 && TREE_CODE (type) != UNION_TYPE
8726 error ("abstract declarator %qT used as declaration", type);
8727 return error_mark_node;
8730 /* Only functions may be declared using an operator-function-id. */
8732 && IDENTIFIER_OPNAME_P (unqualified_id)
8733 && TREE_CODE (type) != FUNCTION_TYPE
8734 && TREE_CODE (type) != METHOD_TYPE)
8736 error ("declaration of %qD as non-function", unqualified_id);
8737 return error_mark_node;
8740 /* We don't check parameter types here because we can emit a better
8741 error message later. */
8742 if (decl_context != PARM)
8744 type = check_var_type (unqualified_id, type);
8745 if (type == error_mark_node)
8746 return error_mark_node;
8749 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8750 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8752 if (decl_context == PARM || decl_context == CATCHPARM)
8754 if (ctype || in_namespace)
8755 error ("cannot use %<::%> in parameter declaration");
8757 /* A parameter declared as an array of T is really a pointer to T.
8758 One declared as a function is really a pointer to a function.
8759 One declared as a member is really a pointer to member. */
8761 if (TREE_CODE (type) == ARRAY_TYPE)
8763 /* Transfer const-ness of array into that of type pointed to. */
8764 type = build_pointer_type (TREE_TYPE (type));
8765 type_quals = TYPE_UNQUALIFIED;
8767 else if (TREE_CODE (type) == FUNCTION_TYPE)
8768 type = build_pointer_type (type);
8774 if (decl_context == PARM)
8776 decl = cp_build_parm_decl (unqualified_id, type);
8778 bad_specifiers (decl, "parameter", virtualp,
8779 memfn_quals != TYPE_UNQUALIFIED,
8780 inlinep, friendp, raises != NULL_TREE);
8782 else if (decl_context == FIELD)
8784 /* The C99 flexible array extension. */
8785 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8786 && TYPE_DOMAIN (type) == NULL_TREE)
8788 tree itype = compute_array_index_type (dname, integer_zero_node);
8789 type = build_cplus_array_type (TREE_TYPE (type), itype);
8792 if (type == error_mark_node)
8794 /* Happens when declaring arrays of sizes which
8795 are error_mark_node, for example. */
8798 else if (in_namespace && !friendp)
8800 /* Something like struct S { int N::j; }; */
8801 error ("invalid use of %<::%>");
8802 return error_mark_node;
8804 else if (TREE_CODE (type) == FUNCTION_TYPE)
8807 tree function_context;
8811 if (ctype == NULL_TREE)
8812 ctype = current_class_type;
8814 if (ctype == NULL_TREE)
8816 error ("can't make %qD into a method -- not in a class",
8818 return error_mark_node;
8821 /* ``A union may [ ... ] not [ have ] virtual functions.''
8823 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
8825 error ("function %qD declared virtual inside a union",
8827 return error_mark_node;
8830 if (NEW_DELETE_OPNAME_P (unqualified_id))
8834 error ("%qD cannot be declared virtual, since it "
8840 else if (staticp < 2)
8841 type = build_memfn_type (type, ctype, memfn_quals);
8844 /* Check that the name used for a destructor makes sense. */
8845 if (sfk == sfk_destructor)
8849 gcc_assert (friendp);
8850 error ("expected qualified name in friend declaration "
8851 "for destructor %qD",
8852 id_declarator->u.id.unqualified_name);
8853 return error_mark_node;
8856 if (!same_type_p (TREE_OPERAND
8857 (id_declarator->u.id.unqualified_name, 0),
8860 error ("declaration of %qD as member of %qT",
8861 id_declarator->u.id.unqualified_name, ctype);
8862 return error_mark_node;
8865 else if (sfk == sfk_constructor && friendp)
8867 error ("expected qualified name in friend declaration "
8868 "for constructor %qD",
8869 id_declarator->u.id.unqualified_name);
8870 return error_mark_node;
8873 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
8874 function_context = (ctype != NULL_TREE) ?
8875 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
8876 publicp = (! friendp || ! staticp)
8877 && function_context == NULL_TREE;
8878 decl = grokfndecl (ctype, type,
8879 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8880 ? unqualified_id : dname,
8883 virtualp, flags, memfn_quals, raises,
8884 friendp ? -1 : 0, friendp, publicp, inlinep,
8886 funcdef_flag, template_count, in_namespace, attrlist);
8887 if (decl == NULL_TREE)
8888 return error_mark_node;
8890 /* This clobbers the attrs stored in `decl' from `attrlist'. */
8891 /* The decl and setting of decl_attr is also turned off. */
8892 decl = build_decl_attribute_variant (decl, decl_attr);
8895 /* [class.conv.ctor]
8897 A constructor declared without the function-specifier
8898 explicit that can be called with a single parameter
8899 specifies a conversion from the type of its first
8900 parameter to the type of its class. Such a constructor
8901 is called a converting constructor. */
8903 DECL_NONCONVERTING_P (decl) = 1;
8904 else if (DECL_CONSTRUCTOR_P (decl))
8906 /* The constructor can be called with exactly one
8907 parameter if there is at least one parameter, and
8908 any subsequent parameters have default arguments.
8909 Ignore any compiler-added parms. */
8910 tree arg_types = FUNCTION_FIRST_USER_PARMTYPE (decl);
8912 if (arg_types == void_list_node
8914 && TREE_CHAIN (arg_types)
8915 && TREE_CHAIN (arg_types) != void_list_node
8916 && !TREE_PURPOSE (TREE_CHAIN (arg_types))))
8917 DECL_NONCONVERTING_P (decl) = 1;
8920 else if (TREE_CODE (type) == METHOD_TYPE)
8922 /* We only get here for friend declarations of
8923 members of other classes. */
8924 /* All method decls are public, so tell grokfndecl to set
8925 TREE_PUBLIC, also. */
8926 decl = grokfndecl (ctype, type,
8927 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
8928 ? unqualified_id : dname,
8931 virtualp, flags, memfn_quals, raises,
8932 friendp ? -1 : 0, friendp, 1, 0, sfk,
8933 funcdef_flag, template_count, in_namespace,
8935 if (decl == NULL_TREE)
8936 return error_mark_node;
8938 else if (!staticp && !dependent_type_p (type)
8939 && !COMPLETE_TYPE_P (complete_type (type))
8940 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
8943 error ("field %qD has incomplete type", unqualified_id);
8945 error ("name %qT has incomplete type", type);
8947 /* If we're instantiating a template, tell them which
8948 instantiation made the field's type be incomplete. */
8949 if (current_class_type
8950 && TYPE_NAME (current_class_type)
8951 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
8953 && declspecs->type == type)
8954 error (" in instantiation of template %qT",
8955 current_class_type);
8957 return error_mark_node;
8963 error ("%qE is neither function nor member function; "
8964 "cannot be declared friend", unqualified_id);
8972 /* Friends are treated specially. */
8973 if (ctype == current_class_type)
8974 ; /* We already issued a pedwarn. */
8975 else if (decl && DECL_NAME (decl))
8977 if (template_class_depth (current_class_type) == 0)
8979 decl = check_explicit_specialization
8980 (unqualified_id, decl, template_count,
8981 2 * funcdef_flag + 4);
8982 if (decl == error_mark_node)
8983 return error_mark_node;
8986 decl = do_friend (ctype, unqualified_id, decl,
8992 return error_mark_node;
8995 /* Structure field. It may not be a function, except for C++. */
8997 if (decl == NULL_TREE)
9003 /* An attempt is being made to initialize a non-static
9004 member. But, from [class.mem]:
9006 4 A member-declarator can contain a
9007 constant-initializer only if it declares a static
9008 member (_class.static_) of integral or enumeration
9009 type, see _class.static.data_.
9011 This used to be relatively common practice, but
9012 the rest of the compiler does not correctly
9013 handle the initialization unless the member is
9014 static so we make it static below. */
9015 pedwarn ("ISO C++ forbids initialization of member %qD",
9017 pedwarn ("making %qD static", unqualified_id);
9021 if (uses_template_parms (type))
9022 /* We'll check at instantiation time. */
9024 else if (check_static_variable_definition (unqualified_id,
9026 /* If we just return the declaration, crashes
9027 will sometimes occur. We therefore return
9028 void_type_node, as if this was a friend
9029 declaration, to cause callers to completely
9030 ignore this declaration. */
9031 return error_mark_node;
9036 /* C++ allows static class members. All other work
9037 for this is done by grokfield. */
9038 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9039 set_linkage_for_static_data_member (decl);
9040 /* Even if there is an in-class initialization, DECL
9041 is considered undefined until an out-of-class
9042 definition is provided. */
9043 DECL_EXTERNAL (decl) = 1;
9046 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9050 decl = build_decl (FIELD_DECL, unqualified_id, type);
9051 DECL_NONADDRESSABLE_P (decl) = bitfield;
9052 if (bitfield && !unqualified_id)
9053 TREE_NO_WARNING (decl) = 1;
9055 if (storage_class == sc_mutable)
9057 DECL_MUTABLE_P (decl) = 1;
9058 storage_class = sc_none;
9062 bad_specifiers (decl, "field", virtualp,
9063 memfn_quals != TYPE_UNQUALIFIED,
9064 inlinep, friendp, raises != NULL_TREE);
9067 else if (TREE_CODE (type) == FUNCTION_TYPE
9068 || TREE_CODE (type) == METHOD_TYPE)
9073 if (!unqualified_id)
9074 return error_mark_node;
9076 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9077 original_name = dname;
9079 original_name = unqualified_id;
9081 if (storage_class == sc_auto)
9082 error ("storage class %<auto%> invalid for function %qs", name);
9083 else if (storage_class == sc_register)
9084 error ("storage class %<register%> invalid for function %qs", name);
9086 error ("storage class %<__thread%> invalid for function %qs", name);
9088 /* Function declaration not at top level.
9089 Storage classes other than `extern' are not allowed
9090 and `extern' makes no difference. */
9091 if (! toplevel_bindings_p ()
9092 && (storage_class == sc_static
9093 || declspecs->specs[(int)ds_inline])
9096 if (storage_class == sc_static)
9097 pedwarn ("%<static%> specified invalid for function %qs "
9098 "declared out of global scope", name);
9100 pedwarn ("%<inline%> specifier invalid for function %qs "
9101 "declared out of global scope", name);
9104 if (ctype == NULL_TREE)
9108 error ("virtual non-class function %qs", name);
9112 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9113 && !NEW_DELETE_OPNAME_P (original_name))
9114 type = build_method_type_directly (ctype,
9116 TYPE_ARG_TYPES (type));
9118 /* Record presence of `static'. */
9119 publicp = (ctype != NULL_TREE
9120 || storage_class == sc_extern
9121 || storage_class != sc_static);
9123 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9124 virtualp, flags, memfn_quals, raises,
9126 publicp, inlinep, sfk, funcdef_flag,
9127 template_count, in_namespace, attrlist);
9128 if (decl == NULL_TREE)
9129 return error_mark_node;
9133 int invalid_static = 0;
9135 /* Don't allow a static member function in a class, and forbid
9136 declaring main to be static. */
9137 if (TREE_CODE (type) == METHOD_TYPE)
9139 pedwarn ("cannot declare member function %qD to have "
9140 "static linkage", decl);
9143 else if (current_function_decl)
9145 /* FIXME need arm citation */
9146 error ("cannot declare static function inside another function");
9153 storage_class = sc_none;
9159 /* It's a variable. */
9161 /* An uninitialized decl with `extern' is a reference. */
9162 decl = grokvardecl (type, unqualified_id,
9165 (type_quals & TYPE_QUAL_CONST) != 0,
9166 ctype ? ctype : in_namespace);
9167 bad_specifiers (decl, "variable", virtualp,
9168 memfn_quals != TYPE_UNQUALIFIED,
9169 inlinep, friendp, raises != NULL_TREE);
9173 DECL_CONTEXT (decl) = ctype;
9176 pedwarn ("%<static%> may not be used when defining "
9177 "(as opposed to declaring) a static data member");
9179 storage_class = sc_none;
9181 if (storage_class == sc_register && TREE_STATIC (decl))
9183 error ("static member %qD declared %<register%>", decl);
9184 storage_class = sc_none;
9186 if (storage_class == sc_extern && pedantic)
9188 pedwarn ("cannot explicitly declare member %q#D to have "
9191 storage_class = sc_none;
9196 /* Record `register' declaration for warnings on &
9197 and in case doing stupid register allocation. */
9199 if (storage_class == sc_register)
9200 DECL_REGISTER (decl) = 1;
9201 else if (storage_class == sc_extern)
9202 DECL_THIS_EXTERN (decl) = 1;
9203 else if (storage_class == sc_static)
9204 DECL_THIS_STATIC (decl) = 1;
9206 /* Record constancy and volatility on the DECL itself . There's
9207 no need to do this when processing a template; we'll do this
9208 for the instantiated declaration based on the type of DECL. */
9209 if (!processing_template_decl)
9210 cp_apply_type_quals_to_decl (type_quals, decl);
9213 TREE_NO_WARNING (decl) = 1;
9219 /* Subroutine of start_function. Ensure that each of the parameter
9220 types (as listed in PARMS) is complete, as is required for a
9221 function definition. */
9224 require_complete_types_for_parms (tree parms)
9226 for (; parms; parms = TREE_CHAIN (parms))
9228 if (dependent_type_p (TREE_TYPE (parms)))
9230 if (!VOID_TYPE_P (TREE_TYPE (parms))
9231 && complete_type_or_else (TREE_TYPE (parms), parms))
9233 relayout_decl (parms);
9234 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9237 /* grokparms or complete_type_or_else will have already issued
9239 TREE_TYPE (parms) = error_mark_node;
9243 /* Returns nonzero if T is a local variable. */
9246 local_variable_p (const_tree t)
9248 if ((TREE_CODE (t) == VAR_DECL
9249 /* A VAR_DECL with a context that is a _TYPE is a static data
9251 && !TYPE_P (CP_DECL_CONTEXT (t))
9252 /* Any other non-local variable must be at namespace scope. */
9253 && !DECL_NAMESPACE_SCOPE_P (t))
9254 || (TREE_CODE (t) == PARM_DECL))
9260 /* Like local_variable_p, but suitable for use as a tree-walking
9264 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9265 void *data ATTRIBUTE_UNUSED)
9267 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9269 else if (TYPE_P (*tp))
9276 /* Check that ARG, which is a default-argument expression for a
9277 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9278 something goes wrong. DECL may also be a _TYPE node, rather than a
9279 DECL, if there is no DECL available. */
9282 check_default_argument (tree decl, tree arg)
9287 if (TREE_CODE (arg) == DEFAULT_ARG)
9288 /* We get a DEFAULT_ARG when looking at an in-class declaration
9289 with a default argument. Ignore the argument for now; we'll
9290 deal with it after the class is complete. */
9299 decl_type = TREE_TYPE (decl);
9301 if (arg == error_mark_node
9302 || decl == error_mark_node
9303 || TREE_TYPE (arg) == error_mark_node
9304 || decl_type == error_mark_node)
9305 /* Something already went wrong. There's no need to check
9307 return error_mark_node;
9309 /* [dcl.fct.default]
9311 A default argument expression is implicitly converted to the
9313 if (!TREE_TYPE (arg)
9314 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9317 error ("default argument for %q#D has type %qT",
9318 decl, TREE_TYPE (arg));
9320 error ("default argument for parameter of type %qT has type %qT",
9321 decl_type, TREE_TYPE (arg));
9323 return error_mark_node;
9326 /* [dcl.fct.default]
9328 Local variables shall not be used in default argument
9331 The keyword `this' shall not be used in a default argument of a
9333 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9336 error ("default argument %qE uses local variable %qD", arg, var);
9337 return error_mark_node;
9344 /* Decode the list of parameter types for a function type.
9345 Given the list of things declared inside the parens,
9346 return a list of types.
9348 If this parameter does not end with an ellipsis, we append
9351 *PARMS is set to the chain of PARM_DECLs created. */
9354 grokparms (cp_parameter_declarator *first_parm, tree *parms)
9356 tree result = NULL_TREE;
9357 tree decls = NULL_TREE;
9358 int ellipsis = !first_parm || first_parm->ellipsis_p;
9359 cp_parameter_declarator *parm;
9361 struct pointer_set_t *unique_decls = pointer_set_create ();
9363 for (parm = first_parm; parm != NULL; parm = parm->next)
9365 tree type = NULL_TREE;
9366 tree init = parm->default_argument;
9370 if (parm == no_parameters)
9373 attrs = parm->decl_specifiers.attributes;
9374 parm->decl_specifiers.attributes = NULL_TREE;
9375 decl = grokdeclarator (parm->declarator, &parm->decl_specifiers,
9376 PARM, init != NULL_TREE, &attrs);
9377 if (! decl || TREE_TYPE (decl) == error_mark_node)
9381 cplus_decl_attributes (&decl, attrs, 0);
9383 type = TREE_TYPE (decl);
9384 if (VOID_TYPE_P (type))
9386 if (same_type_p (type, void_type_node)
9387 && DECL_SELF_REFERENCE_P (type)
9388 && !DECL_NAME (decl) && !result && !parm->next && !ellipsis)
9389 /* this is a parmlist of `(void)', which is ok. */
9391 cxx_incomplete_type_error (decl, type);
9392 /* It's not a good idea to actually create parameters of
9393 type `void'; other parts of the compiler assume that a
9394 void type terminates the parameter list. */
9395 type = error_mark_node;
9396 TREE_TYPE (decl) = error_mark_node;
9399 if (type != error_mark_node
9400 && TYPE_FOR_JAVA (type)
9401 && IS_AGGR_TYPE (type))
9403 error ("parameter %qD has Java class type", decl);
9404 type = error_mark_node;
9405 TREE_TYPE (decl) = error_mark_node;
9409 if (type != error_mark_node)
9411 /* Top-level qualifiers on the parameters are
9412 ignored for function types. */
9413 type = cp_build_qualified_type (type, 0);
9414 if (TREE_CODE (type) == METHOD_TYPE)
9416 error ("parameter %qD invalidly declared method type", decl);
9417 type = build_pointer_type (type);
9418 TREE_TYPE (decl) = type;
9420 else if (abstract_virtuals_error (decl, type))
9421 any_error = 1; /* Seems like a good idea. */
9422 else if (POINTER_TYPE_P (type))
9424 /* [dcl.fct]/6, parameter types cannot contain pointers
9425 (references) to arrays of unknown bound. */
9426 tree t = TREE_TYPE (type);
9427 int ptr = TYPE_PTR_P (type);
9433 else if (TREE_CODE (t) != ARRAY_TYPE)
9435 else if (!TYPE_DOMAIN (t))
9439 if (TREE_CODE (t) == ARRAY_TYPE)
9440 error ("parameter %qD includes %s to array of unknown "
9442 decl, ptr ? "pointer" : "reference", t);
9447 else if (init && !processing_template_decl)
9448 init = check_default_argument (decl, init);
9451 if (TREE_CODE (decl) == PARM_DECL
9452 && FUNCTION_PARAMETER_PACK_P (decl)
9454 error ("parameter packs must be at the end of the parameter list");
9456 if (DECL_NAME (decl))
9458 if (pointer_set_contains (unique_decls, DECL_NAME (decl)))
9459 error ("multiple parameters named %qE", DECL_NAME (decl));
9461 pointer_set_insert (unique_decls, DECL_NAME (decl));
9464 TREE_CHAIN (decl) = decls;
9466 result = tree_cons (init, type, result);
9468 decls = nreverse (decls);
9469 result = nreverse (result);
9471 result = chainon (result, void_list_node);
9474 pointer_set_destroy (unique_decls);
9479 /* D is a constructor or overloaded `operator='.
9481 Let T be the class in which D is declared. Then, this function
9484 -1 if D's is an ill-formed constructor or copy assignment operator
9485 whose first parameter is of type `T'.
9486 0 if D is not a copy constructor or copy assignment
9488 1 if D is a copy constructor or copy assignment operator whose
9489 first parameter is a reference to const qualified T.
9490 2 if D is a copy constructor or copy assignment operator whose
9491 first parameter is a reference to non-const qualified T.
9493 This function can be used as a predicate. Positive values indicate
9494 a copy constructor and nonzero values indicate a copy assignment
9498 copy_fn_p (const_tree d)
9504 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9506 if (TREE_CODE (d) == TEMPLATE_DECL
9507 || (DECL_TEMPLATE_INFO (d)
9508 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9509 /* Instantiations of template member functions are never copy
9510 functions. Note that member functions of templated classes are
9511 represented as template functions internally, and we must
9512 accept those as copy functions. */
9515 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9519 arg_type = TREE_VALUE (args);
9520 if (arg_type == error_mark_node)
9523 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9525 /* Pass by value copy assignment operator. */
9528 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9529 && !TYPE_REF_IS_RVALUE (arg_type)
9530 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9532 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9538 args = TREE_CHAIN (args);
9540 if (args && args != void_list_node && !TREE_PURPOSE (args))
9541 /* There are more non-optional args. */
9547 /* D is a constructor or overloaded `operator='.
9549 Let T be the class in which D is declared. Then, this function
9550 returns true when D is a move constructor or move assignment
9551 operator, false otherwise. */
9554 move_fn_p (const_tree d)
9558 bool result = false;
9560 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9562 if (cxx_dialect == cxx98)
9563 /* There are no move constructors if we are in C++98 mode. */
9566 if (TREE_CODE (d) == TEMPLATE_DECL
9567 || (DECL_TEMPLATE_INFO (d)
9568 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9569 /* Instantiations of template member functions are never copy
9570 functions. Note that member functions of templated classes are
9571 represented as template functions internally, and we must
9572 accept those as copy functions. */
9575 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9579 arg_type = TREE_VALUE (args);
9580 if (arg_type == error_mark_node)
9583 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9584 && TYPE_REF_IS_RVALUE (arg_type)
9585 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9589 args = TREE_CHAIN (args);
9591 if (args && args != void_list_node && !TREE_PURPOSE (args))
9592 /* There are more non-optional args. */
9598 /* Remember any special properties of member function DECL. */
9601 grok_special_member_properties (tree decl)
9605 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9608 class_type = DECL_CONTEXT (decl);
9609 if (DECL_CONSTRUCTOR_P (decl))
9611 int ctor = copy_fn_p (decl);
9613 if (!DECL_ARTIFICIAL (decl))
9614 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9620 A non-template constructor for class X is a copy
9621 constructor if its first parameter is of type X&, const
9622 X&, volatile X& or const volatile X&, and either there
9623 are no other parameters or else all other parameters have
9624 default arguments. */
9625 TYPE_HAS_INIT_REF (class_type) = 1;
9627 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9629 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9630 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9632 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9636 A non-template assignment operator for class X is a copy
9637 assignment operator if its parameter is of type X, X&, const
9638 X&, volatile X& or const volatile X&. */
9640 int assop = copy_fn_p (decl);
9644 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9646 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9651 /* Check a constructor DECL has the correct form. Complains
9652 if the class has a constructor of the form X(X). */
9655 grok_ctor_properties (const_tree ctype, const_tree decl)
9657 int ctor_parm = copy_fn_p (decl);
9663 A declaration of a constructor for a class X is ill-formed if
9664 its first parameter is of type (optionally cv-qualified) X
9665 and either there are no other parameters or else all other
9666 parameters have default arguments.
9668 We *don't* complain about member template instantiations that
9669 have this form, though; they can occur as we try to decide
9670 what constructor to use during overload resolution. Since
9671 overload resolution will never prefer such a constructor to
9672 the non-template copy constructor (which is either explicitly
9673 or implicitly defined), there's no need to worry about their
9674 existence. Theoretically, they should never even be
9675 instantiated, but that's hard to forestall. */
9676 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9684 /* An operator with this code is unary, but can also be binary. */
9687 ambi_op_p (enum tree_code code)
9689 return (code == INDIRECT_REF
9690 || code == ADDR_EXPR
9691 || code == UNARY_PLUS_EXPR
9692 || code == NEGATE_EXPR
9693 || code == PREINCREMENT_EXPR
9694 || code == PREDECREMENT_EXPR);
9697 /* An operator with this name can only be unary. */
9700 unary_op_p (enum tree_code code)
9702 return (code == TRUTH_NOT_EXPR
9703 || code == BIT_NOT_EXPR
9704 || code == COMPONENT_REF
9705 || code == TYPE_EXPR);
9708 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9709 errors are issued for invalid declarations. */
9712 grok_op_properties (tree decl, bool complain)
9714 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9716 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9717 tree name = DECL_NAME (decl);
9718 enum tree_code operator_code;
9723 /* Count the number of arguments and check for ellipsis. */
9724 for (argtype = argtypes, arity = 0;
9725 argtype && argtype != void_list_node;
9726 argtype = TREE_CHAIN (argtype))
9728 ellipsis_p = !argtype;
9730 class_type = DECL_CONTEXT (decl);
9731 if (class_type && !CLASS_TYPE_P (class_type))
9732 class_type = NULL_TREE;
9734 if (DECL_CONV_FN_P (decl))
9735 operator_code = TYPE_EXPR;
9739 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9740 if (ansi_opname (CODE) == name) \
9742 operator_code = (CODE); \
9745 else if (ansi_assopname (CODE) == name) \
9747 operator_code = (CODE); \
9748 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9752 #include "operators.def"
9758 gcc_assert (operator_code != LAST_CPLUS_TREE_CODE);
9759 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9762 switch (operator_code)
9765 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
9769 TYPE_GETS_DELETE (class_type) |= 1;
9773 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
9776 case VEC_DELETE_EXPR:
9777 TYPE_GETS_DELETE (class_type) |= 2;
9784 /* [basic.std.dynamic.allocation]/1:
9786 A program is ill-formed if an allocation function is declared
9787 in a namespace scope other than global scope or declared static
9790 The same also holds true for deallocation functions. */
9791 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
9792 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9794 if (DECL_NAMESPACE_SCOPE_P (decl))
9796 if (CP_DECL_CONTEXT (decl) != global_namespace)
9798 error ("%qD may not be declared within a namespace", decl);
9801 else if (!TREE_PUBLIC (decl))
9803 error ("%qD may not be declared as static", decl);
9809 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
9811 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
9812 DECL_IS_OPERATOR_NEW (decl) = 1;
9814 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
9815 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
9818 /* An operator function must either be a non-static member function
9819 or have at least one parameter of a class, a reference to a class,
9820 an enumeration, or a reference to an enumeration. 13.4.0.6 */
9821 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
9823 if (operator_code == TYPE_EXPR
9824 || operator_code == CALL_EXPR
9825 || operator_code == COMPONENT_REF
9826 || operator_code == ARRAY_REF
9827 || operator_code == NOP_EXPR)
9829 error ("%qD must be a nonstatic member function", decl);
9836 if (DECL_STATIC_FUNCTION_P (decl))
9838 error ("%qD must be either a non-static member "
9839 "function or a non-member function", decl);
9843 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
9845 tree arg = non_reference (TREE_VALUE (p));
9846 if (arg == error_mark_node)
9849 /* IS_AGGR_TYPE, rather than CLASS_TYPE_P, is used
9850 because these checks are performed even on
9851 template functions. */
9852 if (IS_AGGR_TYPE (arg) || TREE_CODE (arg) == ENUMERAL_TYPE)
9856 if (!p || p == void_list_node)
9859 error ("%qD must have an argument of class or "
9860 "enumerated type", decl);
9866 /* There are no restrictions on the arguments to an overloaded
9868 if (operator_code == CALL_EXPR)
9871 /* Warn about conversion operators that will never be used. */
9872 if (IDENTIFIER_TYPENAME_P (name)
9873 && ! DECL_TEMPLATE_INFO (decl)
9875 /* Warn only declaring the function; there is no need to
9876 warn again about out-of-class definitions. */
9877 && class_type == current_class_type)
9879 tree t = TREE_TYPE (name);
9880 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
9881 const char *what = 0;
9884 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
9886 if (TREE_CODE (t) == VOID_TYPE)
9888 else if (class_type)
9890 if (t == class_type)
9891 what = "the same type";
9892 /* Don't force t to be complete here. */
9893 else if (IS_AGGR_TYPE (t)
9894 && COMPLETE_TYPE_P (t)
9895 && DERIVED_FROM_P (t, class_type))
9896 what = "a base class";
9900 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
9901 "conversion operator",
9902 ref ? "a reference to " : "", what);
9905 if (operator_code == COND_EXPR)
9908 error ("ISO C++ prohibits overloading operator ?:");
9911 else if (ellipsis_p)
9913 error ("%qD must not have variable number of arguments", decl);
9916 else if (ambi_op_p (operator_code))
9919 /* We pick the one-argument operator codes by default, so
9920 we don't have to change anything. */
9922 else if (arity == 2)
9924 /* If we thought this was a unary operator, we now know
9925 it to be a binary operator. */
9926 switch (operator_code)
9929 operator_code = MULT_EXPR;
9933 operator_code = BIT_AND_EXPR;
9936 case UNARY_PLUS_EXPR:
9937 operator_code = PLUS_EXPR;
9941 operator_code = MINUS_EXPR;
9944 case PREINCREMENT_EXPR:
9945 operator_code = POSTINCREMENT_EXPR;
9948 case PREDECREMENT_EXPR:
9949 operator_code = POSTDECREMENT_EXPR;
9956 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9958 if ((operator_code == POSTINCREMENT_EXPR
9959 || operator_code == POSTDECREMENT_EXPR)
9960 && ! processing_template_decl
9961 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
9964 error ("postfix %qD must take %<int%> as its argument",
9967 error ("postfix %qD must take %<int%> as its second "
9975 error ("%qD must take either zero or one argument", decl);
9977 error ("%qD must take either one or two arguments", decl);
9981 /* More Effective C++ rule 6. */
9983 && (operator_code == POSTINCREMENT_EXPR
9984 || operator_code == POSTDECREMENT_EXPR
9985 || operator_code == PREINCREMENT_EXPR
9986 || operator_code == PREDECREMENT_EXPR))
9988 tree arg = TREE_VALUE (argtypes);
9989 tree ret = TREE_TYPE (TREE_TYPE (decl));
9990 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
9991 arg = TREE_TYPE (arg);
9992 arg = TYPE_MAIN_VARIANT (arg);
9993 if (operator_code == PREINCREMENT_EXPR
9994 || operator_code == PREDECREMENT_EXPR)
9996 if (TREE_CODE (ret) != REFERENCE_TYPE
9997 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
9999 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10000 build_reference_type (arg));
10004 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10005 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10009 else if (unary_op_p (operator_code))
10014 error ("%qD must take %<void%>", decl);
10016 error ("%qD must take exactly one argument", decl);
10020 else /* if (binary_op_p (operator_code)) */
10025 error ("%qD must take exactly one argument", decl);
10027 error ("%qD must take exactly two arguments", decl);
10031 /* More Effective C++ rule 7. */
10033 && (operator_code == TRUTH_ANDIF_EXPR
10034 || operator_code == TRUTH_ORIF_EXPR
10035 || operator_code == COMPOUND_EXPR))
10036 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10040 /* Effective C++ rule 23. */
10043 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10044 && (operator_code == PLUS_EXPR
10045 || operator_code == MINUS_EXPR
10046 || operator_code == TRUNC_DIV_EXPR
10047 || operator_code == MULT_EXPR
10048 || operator_code == TRUNC_MOD_EXPR)
10049 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10050 warning (OPT_Weffc__, "%qD should return by value", decl);
10052 /* [over.oper]/8 */
10053 for (; argtypes && argtypes != void_list_node;
10054 argtypes = TREE_CHAIN (argtypes))
10055 if (TREE_PURPOSE (argtypes))
10057 TREE_PURPOSE (argtypes) = NULL_TREE;
10058 if (operator_code == POSTINCREMENT_EXPR
10059 || operator_code == POSTDECREMENT_EXPR)
10062 pedwarn ("%qD cannot have default arguments", decl);
10066 error ("%qD cannot have default arguments", decl);
10074 /* Return a string giving the keyword associate with CODE. */
10076 static const char *
10077 tag_name (enum tag_types code)
10089 case typename_type:
10092 gcc_unreachable ();
10096 /* Name lookup in an elaborated-type-specifier (after the keyword
10097 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10098 elaborated-type-specifier is invalid, issue a diagnostic and return
10099 error_mark_node; otherwise, return the *_TYPE to which it referred.
10100 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10103 check_elaborated_type_specifier (enum tag_types tag_code,
10105 bool allow_template_p)
10111 struct S { struct S *p; };
10113 name lookup will find the TYPE_DECL for the implicit "S::S"
10114 typedef. Adjust for that here. */
10115 if (DECL_SELF_REFERENCE_P (decl))
10116 decl = TYPE_NAME (TREE_TYPE (decl));
10118 type = TREE_TYPE (decl);
10120 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10121 is false for this case as well. */
10122 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10124 error ("using template type parameter %qT after %qs",
10125 type, tag_name (tag_code));
10126 return error_mark_node;
10130 If the identifier resolves to a typedef-name or a template
10131 type-parameter, the elaborated-type-specifier is ill-formed.
10133 In other words, the only legitimate declaration to use in the
10134 elaborated type specifier is the implicit typedef created when
10135 the type is declared. */
10136 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10137 && tag_code != typename_type)
10139 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10140 error ("%q+D has a previous declaration here", decl);
10141 return error_mark_node;
10143 else if (TREE_CODE (type) != RECORD_TYPE
10144 && TREE_CODE (type) != UNION_TYPE
10145 && tag_code != enum_type
10146 && tag_code != typename_type)
10148 error ("%qT referred to as %qs", type, tag_name (tag_code));
10149 error ("%q+T has a previous declaration here", type);
10150 return error_mark_node;
10152 else if (TREE_CODE (type) != ENUMERAL_TYPE
10153 && tag_code == enum_type)
10155 error ("%qT referred to as enum", type);
10156 error ("%q+T has a previous declaration here", type);
10157 return error_mark_node;
10159 else if (!allow_template_p
10160 && TREE_CODE (type) == RECORD_TYPE
10161 && CLASSTYPE_IS_TEMPLATE (type))
10163 /* If a class template appears as elaborated type specifier
10164 without a template header such as:
10166 template <class T> class C {};
10167 void f(class C); // No template header here
10169 then the required template argument is missing. */
10170 error ("template argument required for %<%s %T%>",
10171 tag_name (tag_code),
10172 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10173 return error_mark_node;
10179 /* Lookup NAME in elaborate type specifier in scope according to
10180 SCOPE and issue diagnostics if necessary.
10181 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10182 found, and ERROR_MARK_NODE for type error. */
10185 lookup_and_check_tag (enum tag_types tag_code, tree name,
10186 tag_scope scope, bool template_header_p)
10190 if (scope == ts_global)
10192 /* First try ordinary name lookup, ignoring hidden class name
10193 injected via friend declaration. */
10194 decl = lookup_name_prefer_type (name, 2);
10195 /* If that fails, the name will be placed in the smallest
10196 non-class, non-function-prototype scope according to 3.3.1/5.
10197 We may already have a hidden name declared as friend in this
10198 scope. So lookup again but not ignoring hidden names.
10199 If we find one, that name will be made visible rather than
10200 creating a new tag. */
10202 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10205 decl = lookup_type_scope (name, scope);
10207 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10208 decl = DECL_TEMPLATE_RESULT (decl);
10210 if (decl && TREE_CODE (decl) == TYPE_DECL)
10212 /* Look for invalid nested type:
10216 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10218 error ("%qD has the same name as the class in which it is "
10221 return error_mark_node;
10224 /* Two cases we need to consider when deciding if a class
10225 template is allowed as an elaborated type specifier:
10226 1. It is a self reference to its own class.
10227 2. It comes with a template header.
10231 template <class T> class C {
10232 class C *c1; // DECL_SELF_REFERENCE_P is true
10235 template <class U> class C; // template_header_p is true
10236 template <class T> class C<T>::D {
10237 class C *c2; // DECL_SELF_REFERENCE_P is true
10240 t = check_elaborated_type_specifier (tag_code,
10243 | DECL_SELF_REFERENCE_P (decl));
10246 else if (decl && TREE_CODE (decl) == TREE_LIST)
10248 error ("reference to %qD is ambiguous", name);
10249 print_candidates (decl);
10250 return error_mark_node;
10256 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10257 Define the tag as a forward-reference if it is not defined.
10259 If a declaration is given, process it here, and report an error if
10260 multiple declarations are not identical.
10262 SCOPE is TS_CURRENT when this is also a definition. Only look in
10263 the current frame for the name (since C++ allows new names in any
10264 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10265 declaration. Only look beginning from the current scope outward up
10266 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10268 TEMPLATE_HEADER_P is true when this declaration is preceded by
10269 a set of template parameters. */
10272 xref_tag (enum tag_types tag_code, tree name,
10273 tag_scope scope, bool template_header_p)
10275 enum tree_code code;
10277 tree context = NULL_TREE;
10279 timevar_push (TV_NAME_LOOKUP);
10281 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10287 code = RECORD_TYPE;
10293 code = ENUMERAL_TYPE;
10296 gcc_unreachable ();
10299 /* In case of anonymous name, xref_tag is only called to
10300 make type node and push name. Name lookup is not required. */
10301 if (ANON_AGGRNAME_P (name))
10304 t = lookup_and_check_tag (tag_code, name,
10305 scope, template_header_p);
10307 if (t == error_mark_node)
10308 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10310 if (scope != ts_current && t && current_class_type
10311 && template_class_depth (current_class_type)
10312 && template_header_p)
10314 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10315 definition of this tag. Since, in addition, we are currently
10316 processing a (member) template declaration of a template
10317 class, we must be very careful; consider:
10324 { template <class V>
10325 friend struct S1; };
10327 Here, the S2::S1 declaration should not be confused with the
10328 outer declaration. In particular, the inner version should
10329 have a template parameter of level 2, not level 1. This
10330 would be particularly important if the member declaration
10333 template <class V = U> friend struct S1;
10335 say, when we should tsubst into `U' when instantiating
10336 S2. On the other hand, when presented with:
10346 we must find the inner binding eventually. We
10347 accomplish this by making sure that the new type we
10348 create to represent this declaration has the right
10350 context = TYPE_CONTEXT (t);
10356 /* If no such tag is yet defined, create a forward-reference node
10357 and record it as the "definition".
10358 When a real declaration of this type is found,
10359 the forward-reference will be altered into a real type. */
10360 if (code == ENUMERAL_TYPE)
10362 error ("use of enum %q#D without previous declaration", name);
10363 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10367 t = make_aggr_type (code);
10368 TYPE_CONTEXT (t) = context;
10369 t = pushtag (name, t, scope);
10374 if (template_header_p && IS_AGGR_TYPE (t))
10376 if (!redeclare_class_template (t, current_template_parms))
10377 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10379 else if (!processing_template_decl
10380 && CLASS_TYPE_P (t)
10381 && CLASSTYPE_IS_TEMPLATE (t))
10383 error ("redeclaration of %qT as a non-template", t);
10384 error ("previous declaration %q+D", t);
10385 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10388 /* Make injected friend class visible. */
10389 if (scope != ts_within_enclosing_non_class
10390 && hidden_name_p (TYPE_NAME (t)))
10392 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10393 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10395 if (TYPE_TEMPLATE_INFO (t))
10397 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10398 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10403 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10407 xref_tag_from_type (tree old, tree id, tag_scope scope)
10409 enum tag_types tag_kind;
10411 if (TREE_CODE (old) == RECORD_TYPE)
10412 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10414 tag_kind = union_type;
10416 if (id == NULL_TREE)
10417 id = TYPE_IDENTIFIER (old);
10419 return xref_tag (tag_kind, id, scope, false);
10422 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10423 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10424 access_* node, and the TREE_VALUE is the type of the base-class.
10425 Non-NULL TREE_TYPE indicates virtual inheritance.
10427 Returns true if the binfo hierarchy was successfully created,
10428 false if an error was detected. */
10431 xref_basetypes (tree ref, tree base_list)
10434 tree binfo, base_binfo;
10435 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10436 unsigned max_bases = 0; /* Maximum direct bases. */
10438 tree default_access;
10439 tree igo_prev; /* Track Inheritance Graph Order. */
10441 if (ref == error_mark_node)
10444 /* The base of a derived class is private by default, all others are
10446 default_access = (TREE_CODE (ref) == RECORD_TYPE
10447 && CLASSTYPE_DECLARED_CLASS (ref)
10448 ? access_private_node : access_public_node);
10450 /* First, make sure that any templates in base-classes are
10451 instantiated. This ensures that if we call ourselves recursively
10452 we do not get confused about which classes are marked and which
10454 basep = &base_list;
10457 tree basetype = TREE_VALUE (*basep);
10459 if (!(processing_template_decl && uses_template_parms (basetype))
10460 && !complete_type_or_else (basetype, NULL))
10461 /* An incomplete type. Remove it from the list. */
10462 *basep = TREE_CHAIN (*basep);
10466 if (TREE_TYPE (*basep))
10468 if (CLASS_TYPE_P (basetype))
10469 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10470 basep = &TREE_CHAIN (*basep);
10474 TYPE_MARKED_P (ref) = 1;
10476 /* The binfo slot should be empty, unless this is an (ill-formed)
10478 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10479 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10481 binfo = make_tree_binfo (max_bases);
10483 TYPE_BINFO (ref) = binfo;
10484 BINFO_OFFSET (binfo) = size_zero_node;
10485 BINFO_TYPE (binfo) = ref;
10489 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10490 /* An aggregate cannot have baseclasses. */
10491 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10493 if (TREE_CODE (ref) == UNION_TYPE)
10495 error ("derived union %qT invalid", ref);
10502 if (TYPE_FOR_JAVA (ref))
10504 error ("Java class %qT cannot have multiple bases", ref);
10511 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10513 if (TYPE_FOR_JAVA (ref))
10515 error ("Java class %qT cannot have virtual bases", ref);
10520 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10522 tree access = TREE_PURPOSE (base_list);
10523 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10524 tree basetype = TREE_VALUE (base_list);
10526 if (access == access_default_node)
10527 access = default_access;
10529 if (PACK_EXPANSION_P (basetype))
10530 basetype = PACK_EXPANSION_PATTERN (basetype);
10531 if (TREE_CODE (basetype) == TYPE_DECL)
10532 basetype = TREE_TYPE (basetype);
10533 if (TREE_CODE (basetype) != RECORD_TYPE
10534 && TREE_CODE (basetype) != TYPENAME_TYPE
10535 && TREE_CODE (basetype) != TEMPLATE_TYPE_PARM
10536 && TREE_CODE (basetype) != BOUND_TEMPLATE_TEMPLATE_PARM)
10538 error ("base type %qT fails to be a struct or class type",
10543 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10544 TYPE_FOR_JAVA (ref) = 1;
10546 base_binfo = NULL_TREE;
10547 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10549 base_binfo = TYPE_BINFO (basetype);
10550 /* The original basetype could have been a typedef'd type. */
10551 basetype = BINFO_TYPE (base_binfo);
10553 /* Inherit flags from the base. */
10554 TYPE_HAS_NEW_OPERATOR (ref)
10555 |= TYPE_HAS_NEW_OPERATOR (basetype);
10556 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10557 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10558 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10559 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10560 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10561 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10562 CLASSTYPE_REPEATED_BASE_P (ref)
10563 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10566 /* We must do this test after we've seen through a typedef
10568 if (TYPE_MARKED_P (basetype))
10570 if (basetype == ref)
10571 error ("recursive type %qT undefined", basetype);
10573 error ("duplicate base type %qT invalid", basetype);
10577 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10578 /* Regenerate the pack expansion for the bases. */
10579 basetype = make_pack_expansion (basetype);
10581 TYPE_MARKED_P (basetype) = 1;
10583 base_binfo = copy_binfo (base_binfo, basetype, ref,
10584 &igo_prev, via_virtual);
10585 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10586 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10588 BINFO_BASE_APPEND (binfo, base_binfo);
10589 BINFO_BASE_ACCESS_APPEND (binfo, access);
10592 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10593 /* If we have space in the vbase vector, we must have shared at
10594 least one of them, and are therefore diamond shaped. */
10595 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10597 /* Unmark all the types. */
10598 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10599 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10600 TYPE_MARKED_P (ref) = 0;
10602 /* Now see if we have a repeated base type. */
10603 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10605 for (base_binfo = binfo; base_binfo;
10606 base_binfo = TREE_CHAIN (base_binfo))
10608 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10610 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10613 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10615 for (base_binfo = binfo; base_binfo;
10616 base_binfo = TREE_CHAIN (base_binfo))
10617 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10618 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10627 /* Begin compiling the definition of an enumeration type.
10629 Returns the type object, as yet incomplete.
10630 Also records info about it so that build_enumerator
10631 may be used to declare the individual values as they are read. */
10634 start_enum (tree name)
10638 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10640 /* If this is the real definition for a previous forward reference,
10641 fill in the contents in the same object that used to be the
10642 forward reference. */
10644 enumtype = lookup_and_check_tag (enum_type, name,
10645 /*tag_scope=*/ts_current,
10646 /*template_header_p=*/false);
10648 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10650 error ("multiple definition of %q#T", enumtype);
10651 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10652 /* Clear out TYPE_VALUES, and start again. */
10653 TYPE_VALUES (enumtype) = NULL_TREE;
10657 /* In case of error, make a dummy enum to allow parsing to
10659 if (enumtype == error_mark_node)
10660 name = make_anon_name ();
10662 enumtype = make_node (ENUMERAL_TYPE);
10663 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10669 /* After processing and defining all the values of an enumeration type,
10670 install their decls in the enumeration type and finish it off.
10671 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10674 finish_enum (tree enumtype)
10683 bool use_short_enum;
10687 integer_type_kind itk;
10688 tree underlying_type = NULL_TREE;
10690 /* We built up the VALUES in reverse order. */
10691 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10693 /* For an enum defined in a template, just set the type of the values;
10694 all further processing is postponed until the template is
10695 instantiated. We need to set the type so that tsubst of a CONST_DECL
10697 if (processing_template_decl)
10699 for (values = TYPE_VALUES (enumtype);
10701 values = TREE_CHAIN (values))
10702 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10703 if (at_function_scope_p ())
10704 add_stmt (build_min (TAG_DEFN, enumtype));
10708 /* Determine the minimum and maximum values of the enumerators. */
10709 if (TYPE_VALUES (enumtype))
10711 minnode = maxnode = NULL_TREE;
10713 for (values = TYPE_VALUES (enumtype);
10715 values = TREE_CHAIN (values))
10717 decl = TREE_VALUE (values);
10719 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10720 each enumerator has the type of its enumeration. Prior to the
10721 closing brace, the type of each enumerator is the type of its
10722 initializing value. */
10723 TREE_TYPE (decl) = enumtype;
10725 /* Update the minimum and maximum values, if appropriate. */
10726 value = DECL_INITIAL (decl);
10727 if (value == error_mark_node)
10728 value = integer_zero_node;
10729 /* Figure out what the minimum and maximum values of the
10730 enumerators are. */
10732 minnode = maxnode = value;
10733 else if (tree_int_cst_lt (maxnode, value))
10735 else if (tree_int_cst_lt (value, minnode))
10742 If the enumerator-list is empty, the underlying type is as if
10743 the enumeration had a single enumerator with value 0. */
10744 minnode = maxnode = integer_zero_node;
10746 /* Compute the number of bits require to represent all values of the
10747 enumeration. We must do this before the type of MINNODE and
10748 MAXNODE are transformed, since min_precision relies on the
10749 TREE_TYPE of the value it is passed. */
10750 unsignedp = tree_int_cst_sgn (minnode) >= 0;
10751 lowprec = min_precision (minnode, unsignedp);
10752 highprec = min_precision (maxnode, unsignedp);
10753 precision = MAX (lowprec, highprec);
10755 /* Determine the underlying type of the enumeration.
10759 The underlying type of an enumeration is an integral type that
10760 can represent all the enumerator values defined in the
10761 enumeration. It is implementation-defined which integral type is
10762 used as the underlying type for an enumeration except that the
10763 underlying type shall not be larger than int unless the value of
10764 an enumerator cannot fit in an int or unsigned int.
10766 We use "int" or an "unsigned int" as the underlying type, even if
10767 a smaller integral type would work, unless the user has
10768 explicitly requested that we use the smallest possible type. The
10769 user can request that for all enumerations with a command line
10770 flag, or for just one enumeration with an attribute. */
10772 use_short_enum = flag_short_enums
10773 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
10775 for (itk = (use_short_enum ? itk_char : itk_int);
10779 underlying_type = integer_types[itk];
10780 if (TYPE_PRECISION (underlying_type) >= precision
10781 && TYPE_UNSIGNED (underlying_type) == unsignedp)
10784 if (itk == itk_none)
10788 IF no integral type can represent all the enumerator values, the
10789 enumeration is ill-formed. */
10790 error ("no integral type can represent all of the enumerator values "
10791 "for %qT", enumtype);
10792 precision = TYPE_PRECISION (long_long_integer_type_node);
10793 underlying_type = integer_types[itk_unsigned_long_long];
10796 /* Compute the minium and maximum values for the type.
10800 For an enumeration where emin is the smallest enumerator and emax
10801 is the largest, the values of the enumeration are the values of the
10802 underlying type in the range bmin to bmax, where bmin and bmax are,
10803 respectively, the smallest and largest values of the smallest bit-
10804 field that can store emin and emax. */
10806 /* The middle-end currently assumes that types with TYPE_PRECISION
10807 narrower than their underlying type are suitably zero or sign
10808 extended to fill their mode. g++ doesn't make these guarantees.
10809 Until the middle-end can represent such paradoxical types, we
10810 set the TYPE_PRECISION to the width of the underlying type. */
10811 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10813 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
10817 The value of sizeof() applied to an enumeration type, an object
10818 of an enumeration type, or an enumerator, is the value of sizeof()
10819 applied to the underlying type. */
10820 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10821 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10822 TYPE_MODE (enumtype) = TYPE_MODE (underlying_type);
10823 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10824 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10825 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10827 /* Convert each of the enumerators to the type of the underlying
10828 type of the enumeration. */
10829 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
10831 location_t saved_location;
10833 decl = TREE_VALUE (values);
10834 saved_location = input_location;
10835 input_location = DECL_SOURCE_LOCATION (decl);
10836 value = perform_implicit_conversion (underlying_type,
10837 DECL_INITIAL (decl));
10838 input_location = saved_location;
10840 /* Do not clobber shared ints. */
10841 value = copy_node (value);
10843 TREE_TYPE (value) = enumtype;
10844 DECL_INITIAL (decl) = value;
10845 TREE_VALUE (values) = value;
10848 /* Fix up all variant types of this enum type. */
10849 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
10851 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
10852 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
10853 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
10854 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
10855 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
10856 TYPE_MODE (t) = TYPE_MODE (enumtype);
10857 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
10858 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
10859 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
10860 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
10863 /* Finish debugging output for this type. */
10864 rest_of_type_compilation (enumtype, namespace_bindings_p ());
10867 /* Build and install a CONST_DECL for an enumeration constant of the
10868 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
10869 Assignment of sequential values by default is handled here. */
10872 build_enumerator (tree name, tree value, tree enumtype)
10878 /* If the VALUE was erroneous, pretend it wasn't there; that will
10879 result in the enum being assigned the next value in sequence. */
10880 if (value == error_mark_node)
10883 /* Remove no-op casts from the value. */
10885 STRIP_TYPE_NOPS (value);
10887 if (! processing_template_decl)
10889 /* Validate and default VALUE. */
10890 if (value != NULL_TREE)
10892 value = integral_constant_value (value);
10894 if (TREE_CODE (value) == INTEGER_CST)
10896 value = perform_integral_promotions (value);
10897 constant_expression_warning (value);
10901 error ("enumerator value for %qD is not an integer constant", name);
10906 /* Default based on previous value. */
10907 if (value == NULL_TREE)
10909 if (TYPE_VALUES (enumtype))
10912 unsigned HOST_WIDE_INT lo;
10916 /* The next value is the previous value plus one. We can
10917 safely assume that the previous value is an INTEGER_CST.
10918 add_double doesn't know the type of the target expression,
10919 so we must check with int_fits_type_p as well. */
10920 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
10921 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
10922 TREE_INT_CST_HIGH (prev_value),
10924 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
10925 overflowed |= !int_fits_type_p (value, TREE_TYPE (prev_value));
10929 error ("overflow in enumeration values at %qD", name);
10930 value = error_mark_node;
10934 value = integer_zero_node;
10937 /* Remove no-op casts from the value. */
10938 STRIP_TYPE_NOPS (value);
10941 /* C++ associates enums with global, function, or class declarations. */
10942 context = current_scope ();
10944 /* Build the actual enumeration constant. Note that the enumeration
10945 constants have the type of their initializers until the
10946 enumeration is complete:
10950 Following the closing brace of an enum-specifier, each enumer-
10951 ator has the type of its enumeration. Prior to the closing
10952 brace, the type of each enumerator is the type of its
10953 initializing value.
10955 In finish_enum we will reset the type. Of course, if we're
10956 processing a template, there may be no value. */
10957 type = value ? TREE_TYPE (value) : NULL_TREE;
10959 if (context && context == current_class_type)
10960 /* This enum declaration is local to the class. We need the full
10961 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
10962 decl = build_lang_decl (CONST_DECL, name, type);
10964 /* It's a global enum, or it's local to a function. (Note local to
10965 a function could mean local to a class method. */
10966 decl = build_decl (CONST_DECL, name, type);
10968 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
10969 TREE_CONSTANT (decl) = 1;
10970 TREE_INVARIANT (decl) = 1;
10971 TREE_READONLY (decl) = 1;
10972 DECL_INITIAL (decl) = value;
10974 if (context && context == current_class_type)
10975 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
10976 on the TYPE_FIELDS list for `S'. (That's so that you can say
10977 things like `S::i' later.) */
10978 finish_member_declaration (decl);
10982 /* Add this enumeration constant to the list for this type. */
10983 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
10987 /* We're defining DECL. Make sure that it's type is OK. */
10990 check_function_type (tree decl, tree current_function_parms)
10992 tree fntype = TREE_TYPE (decl);
10993 tree return_type = complete_type (TREE_TYPE (fntype));
10995 /* In a function definition, arg types must be complete. */
10996 require_complete_types_for_parms (current_function_parms);
10998 if (dependent_type_p (return_type))
11000 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11001 || (TYPE_FOR_JAVA (return_type) && IS_AGGR_TYPE (return_type)))
11003 tree args = TYPE_ARG_TYPES (fntype);
11005 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11006 error ("return type %q#T is incomplete", return_type);
11008 error ("return type has Java class type %q#T", return_type);
11010 /* Make it return void instead. */
11011 if (TREE_CODE (fntype) == METHOD_TYPE)
11012 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11014 TREE_CHAIN (args));
11016 fntype = build_function_type (void_type_node, args);
11018 = build_exception_variant (fntype,
11019 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11022 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11025 /* Create the FUNCTION_DECL for a function definition.
11026 DECLSPECS and DECLARATOR are the parts of the declaration;
11027 they describe the function's name and the type it returns,
11028 but twisted together in a fashion that parallels the syntax of C.
11030 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11031 DECLARATOR is really the DECL for the function we are about to
11032 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11033 indicating that the function is an inline defined in-class.
11035 This function creates a binding context for the function body
11036 as well as setting up the FUNCTION_DECL in current_function_decl.
11038 For C++, we must first check whether that datum makes any sense.
11039 For example, "class A local_a(1,2);" means that variable local_a
11040 is an aggregate of type A, which should have a constructor
11041 applied to it with the argument list [1, 2].
11043 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11044 or may be a BLOCK if the function has been defined previously
11045 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11046 error_mark_node if the function has never been defined, or
11047 a BLOCK if the function has been defined somewhere. */
11050 start_preparsed_function (tree decl1, tree attrs, int flags)
11052 tree ctype = NULL_TREE;
11055 int doing_friend = 0;
11056 struct cp_binding_level *bl;
11057 tree current_function_parms;
11058 struct c_fileinfo *finfo
11059 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11060 bool honor_interface;
11062 /* Sanity check. */
11063 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11064 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11066 fntype = TREE_TYPE (decl1);
11067 if (TREE_CODE (fntype) == METHOD_TYPE)
11068 ctype = TYPE_METHOD_BASETYPE (fntype);
11070 /* ISO C++ 11.4/5. A friend function defined in a class is in
11071 the (lexical) scope of the class in which it is defined. */
11072 if (!ctype && DECL_FRIEND_P (decl1))
11074 ctype = DECL_FRIEND_CONTEXT (decl1);
11076 /* CTYPE could be null here if we're dealing with a template;
11077 for example, `inline friend float foo()' inside a template
11078 will have no CTYPE set. */
11079 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11085 if (DECL_DECLARED_INLINE_P (decl1)
11086 && lookup_attribute ("noinline", attrs))
11087 warning (0, "inline function %q+D given attribute noinline", decl1);
11089 /* Handle gnu_inline attribute. */
11090 if (GNU_INLINE_P (decl1))
11092 DECL_EXTERNAL (decl1) = 1;
11093 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11094 DECL_INTERFACE_KNOWN (decl1) = 1;
11095 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11098 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11099 /* This is a constructor, we must ensure that any default args
11100 introduced by this definition are propagated to the clones
11101 now. The clones are used directly in overload resolution. */
11102 adjust_clone_args (decl1);
11104 /* Sometimes we don't notice that a function is a static member, and
11105 build a METHOD_TYPE for it. Fix that up now. */
11106 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11107 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11109 revert_static_member_fn (decl1);
11113 /* Set up current_class_type, and enter the scope of the class, if
11116 push_nested_class (ctype);
11117 else if (DECL_STATIC_FUNCTION_P (decl1))
11118 push_nested_class (DECL_CONTEXT (decl1));
11120 /* Now that we have entered the scope of the class, we must restore
11121 the bindings for any template parameters surrounding DECL1, if it
11122 is an inline member template. (Order is important; consider the
11123 case where a template parameter has the same name as a field of
11124 the class.) It is not until after this point that
11125 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11126 if (flags & SF_INCLASS_INLINE)
11127 maybe_begin_member_template_processing (decl1);
11129 /* Effective C++ rule 15. */
11131 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11132 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11133 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11135 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11136 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11137 if (!DECL_INITIAL (decl1))
11138 DECL_INITIAL (decl1) = error_mark_node;
11140 /* This function exists in static storage.
11141 (This does not mean `static' in the C sense!) */
11142 TREE_STATIC (decl1) = 1;
11144 /* We must call push_template_decl after current_class_type is set
11145 up. (If we are processing inline definitions after exiting a
11146 class scope, current_class_type will be NULL_TREE until set above
11147 by push_nested_class.) */
11148 if (processing_template_decl)
11150 /* FIXME: Handle error_mark_node more gracefully. */
11151 tree newdecl1 = push_template_decl (decl1);
11152 if (newdecl1 != error_mark_node)
11156 /* We are now in the scope of the function being defined. */
11157 current_function_decl = decl1;
11159 /* Save the parm names or decls from this function's declarator
11160 where store_parm_decls will find them. */
11161 current_function_parms = DECL_ARGUMENTS (decl1);
11163 /* Make sure the parameter and return types are reasonable. When
11164 you declare a function, these types can be incomplete, but they
11165 must be complete when you define the function. */
11166 check_function_type (decl1, current_function_parms);
11168 /* Build the return declaration for the function. */
11169 restype = TREE_TYPE (fntype);
11170 if (DECL_RESULT (decl1) == NULL_TREE)
11174 resdecl = build_decl (RESULT_DECL, 0, TYPE_MAIN_VARIANT (restype));
11175 DECL_ARTIFICIAL (resdecl) = 1;
11176 DECL_IGNORED_P (resdecl) = 1;
11177 DECL_RESULT (decl1) = resdecl;
11179 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11182 /* Let the user know we're compiling this function. */
11183 announce_function (decl1);
11185 /* Record the decl so that the function name is defined.
11186 If we already have a decl for this name, and it is a FUNCTION_DECL,
11187 use the old decl. */
11188 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11190 /* A specialization is not used to guide overload resolution. */
11191 if (!DECL_FUNCTION_MEMBER_P (decl1)
11192 && !(DECL_USE_TEMPLATE (decl1) &&
11193 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11195 tree olddecl = pushdecl (decl1);
11197 if (olddecl == error_mark_node)
11198 /* If something went wrong when registering the declaration,
11199 use DECL1; we have to have a FUNCTION_DECL to use when
11200 parsing the body of the function. */
11204 /* Otherwise, OLDDECL is either a previous declaration
11205 of the same function or DECL1 itself. */
11207 if (warn_missing_declarations
11208 && olddecl == decl1
11209 && !DECL_MAIN_P (decl1)
11210 && TREE_PUBLIC (decl1)
11211 && !DECL_DECLARED_INLINE_P (decl1))
11215 /* Check whether DECL1 is in an anonymous
11217 for (context = DECL_CONTEXT (decl1);
11219 context = DECL_CONTEXT (context))
11221 if (TREE_CODE (context) == NAMESPACE_DECL
11222 && DECL_NAME (context) == NULL_TREE)
11226 if (context == NULL)
11227 warning (OPT_Wmissing_declarations,
11228 "no previous declaration for %q+D", decl1);
11236 /* We need to set the DECL_CONTEXT. */
11237 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11238 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11240 fntype = TREE_TYPE (decl1);
11242 /* If #pragma weak applies, mark the decl appropriately now.
11243 The pragma only applies to global functions. Because
11244 determining whether or not the #pragma applies involves
11245 computing the mangled name for the declaration, we cannot
11246 apply the pragma until after we have merged this declaration
11247 with any previous declarations; if the original declaration
11248 has a linkage specification, that specification applies to
11249 the definition as well, and may affect the mangled name. */
11250 if (!DECL_CONTEXT (decl1))
11251 maybe_apply_pragma_weak (decl1);
11254 /* Reset this in case the call to pushdecl changed it. */
11255 current_function_decl = decl1;
11257 gcc_assert (DECL_INITIAL (decl1));
11259 /* This function may already have been parsed, in which case just
11260 return; our caller will skip over the body without parsing. */
11261 if (DECL_INITIAL (decl1) != error_mark_node)
11264 /* Initialize RTL machinery. We cannot do this until
11265 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11266 even when processing a template; this is how we get
11267 CFUN set up, and our per-function variables initialized.
11268 FIXME factor out the non-RTL stuff. */
11269 bl = current_binding_level;
11270 allocate_struct_function (decl1, processing_template_decl);
11271 current_binding_level = bl;
11273 /* Even though we're inside a function body, we still don't want to
11274 call expand_expr to calculate the size of a variable-sized array.
11275 We haven't necessarily assigned RTL to all variables yet, so it's
11276 not safe to try to expand expressions involving them. */
11277 cfun->x_dont_save_pending_sizes_p = 1;
11279 /* Start the statement-tree, start the tree now. */
11280 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11282 /* If we are (erroneously) defining a function that we have already
11283 defined before, wipe out what we knew before. */
11284 if (!DECL_PENDING_INLINE_P (decl1))
11285 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11287 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11289 /* We know that this was set up by `grokclassfn'. We do not
11290 wait until `store_parm_decls', since evil parse errors may
11291 never get us to that point. Here we keep the consistency
11292 between `current_class_type' and `current_class_ptr'. */
11293 tree t = DECL_ARGUMENTS (decl1);
11295 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11296 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11298 cp_function_chain->x_current_class_ref
11299 = build_indirect_ref (t, NULL);
11300 cp_function_chain->x_current_class_ptr = t;
11302 /* Constructors and destructors need to know whether they're "in
11303 charge" of initializing virtual base classes. */
11304 t = TREE_CHAIN (t);
11305 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11307 current_in_charge_parm = t;
11308 t = TREE_CHAIN (t);
11310 if (DECL_HAS_VTT_PARM_P (decl1))
11312 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11313 current_vtt_parm = t;
11317 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11318 /* Implicitly-defined methods (like the
11319 destructor for a class in which no destructor
11320 is explicitly declared) must not be defined
11321 until their definition is needed. So, we
11322 ignore interface specifications for
11323 compiler-generated functions. */
11324 && !DECL_ARTIFICIAL (decl1));
11326 if (DECL_INTERFACE_KNOWN (decl1))
11328 tree ctx = decl_function_context (decl1);
11330 if (DECL_NOT_REALLY_EXTERN (decl1))
11331 DECL_EXTERNAL (decl1) = 0;
11333 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11334 && TREE_PUBLIC (ctx))
11335 /* This is a function in a local class in an extern inline
11337 comdat_linkage (decl1);
11339 /* If this function belongs to an interface, it is public.
11340 If it belongs to someone else's interface, it is also external.
11341 This only affects inlines and template instantiations. */
11342 else if (!finfo->interface_unknown && honor_interface)
11344 if (DECL_DECLARED_INLINE_P (decl1)
11345 || DECL_TEMPLATE_INSTANTIATION (decl1)
11346 || processing_template_decl)
11348 DECL_EXTERNAL (decl1)
11349 = (finfo->interface_only
11350 || (DECL_DECLARED_INLINE_P (decl1)
11351 && ! flag_implement_inlines
11352 && !DECL_VINDEX (decl1)));
11354 /* For WIN32 we also want to put these in linkonce sections. */
11355 maybe_make_one_only (decl1);
11358 DECL_EXTERNAL (decl1) = 0;
11359 DECL_INTERFACE_KNOWN (decl1) = 1;
11360 /* If this function is in an interface implemented in this file,
11361 make sure that the back end knows to emit this function
11363 if (!DECL_EXTERNAL (decl1))
11364 mark_needed (decl1);
11366 else if (finfo->interface_unknown && finfo->interface_only
11367 && honor_interface)
11369 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11370 interface, we will have both finfo->interface_unknown and
11371 finfo->interface_only set. In that case, we don't want to
11372 use the normal heuristics because someone will supply a
11373 #pragma implementation elsewhere, and deducing it here would
11374 produce a conflict. */
11375 comdat_linkage (decl1);
11376 DECL_EXTERNAL (decl1) = 0;
11377 DECL_INTERFACE_KNOWN (decl1) = 1;
11378 DECL_DEFER_OUTPUT (decl1) = 1;
11382 /* This is a definition, not a reference.
11383 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11384 if (!GNU_INLINE_P (decl1))
11385 DECL_EXTERNAL (decl1) = 0;
11387 if ((DECL_DECLARED_INLINE_P (decl1)
11388 || DECL_TEMPLATE_INSTANTIATION (decl1))
11389 && ! DECL_INTERFACE_KNOWN (decl1)
11390 /* Don't try to defer nested functions for now. */
11391 && ! decl_function_context (decl1))
11392 DECL_DEFER_OUTPUT (decl1) = 1;
11394 DECL_INTERFACE_KNOWN (decl1) = 1;
11397 /* Determine the ELF visibility attribute for the function. We must not
11398 do this before calling "pushdecl", as we must allow "duplicate_decls"
11399 to merge any attributes appropriately. We also need to wait until
11401 if (!DECL_CLONED_FUNCTION_P (decl1))
11402 determine_visibility (decl1);
11404 begin_scope (sk_function_parms, decl1);
11408 if (DECL_DESTRUCTOR_P (decl1)
11409 || (DECL_CONSTRUCTOR_P (decl1)
11410 && targetm.cxx.cdtor_returns_this ()))
11412 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11413 DECL_CONTEXT (cdtor_label) = current_function_decl;
11416 start_fname_decls ();
11418 store_parm_decls (current_function_parms);
11422 /* Like start_preparsed_function, except that instead of a
11423 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11425 Returns 1 on success. If the DECLARATOR is not suitable for a function
11426 (it defines a datum instead), we return 0, which tells
11427 yyparse to report a parse error. */
11430 start_function (cp_decl_specifier_seq *declspecs,
11431 const cp_declarator *declarator,
11436 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11437 /* If the declarator is not suitable for a function definition,
11438 cause a syntax error. */
11439 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11442 if (DECL_MAIN_P (decl1))
11443 /* main must return int. grokfndecl should have corrected it
11444 (and issued a diagnostic) if the user got it wrong. */
11445 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11446 integer_type_node));
11448 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11453 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11457 use_eh_spec_block (tree fn)
11459 return (flag_exceptions && flag_enforce_eh_specs
11460 && !processing_template_decl
11461 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11462 /* We insert the EH_SPEC_BLOCK only in the original
11463 function; then, it is copied automatically to the
11465 && !DECL_CLONED_FUNCTION_P (fn)
11466 /* Implicitly-generated constructors and destructors have
11467 exception specifications. However, those specifications
11468 are the union of the possible exceptions specified by the
11469 constructors/destructors for bases and members, so no
11470 unallowed exception will ever reach this function. By
11471 not creating the EH_SPEC_BLOCK we save a little memory,
11472 and we avoid spurious warnings about unreachable
11474 && !DECL_ARTIFICIAL (fn));
11477 /* Store the parameter declarations into the current function declaration.
11478 This is called after parsing the parameter declarations, before
11479 digesting the body of the function.
11481 Also install to binding contour return value identifier, if any. */
11484 store_parm_decls (tree current_function_parms)
11486 tree fndecl = current_function_decl;
11489 /* This is a chain of any other decls that came in among the parm
11490 declarations. If a parm is declared with enum {foo, bar} x;
11491 then CONST_DECLs for foo and bar are put here. */
11492 tree nonparms = NULL_TREE;
11494 if (current_function_parms)
11496 /* This case is when the function was defined with an ANSI prototype.
11497 The parms already have decls, so we need not do anything here
11498 except record them as in effect
11499 and complain if any redundant old-style parm decls were written. */
11501 tree specparms = current_function_parms;
11504 /* Must clear this because it might contain TYPE_DECLs declared
11506 current_binding_level->names = NULL;
11508 /* If we're doing semantic analysis, then we'll call pushdecl
11509 for each of these. We must do them in reverse order so that
11510 they end in the correct forward order. */
11511 specparms = nreverse (specparms);
11513 for (parm = specparms; parm; parm = next)
11515 next = TREE_CHAIN (parm);
11516 if (TREE_CODE (parm) == PARM_DECL)
11518 if (DECL_NAME (parm) == NULL_TREE
11519 || TREE_CODE (parm) != VOID_TYPE)
11522 error ("parameter %qD declared void", parm);
11526 /* If we find an enum constant or a type tag,
11527 put it aside for the moment. */
11528 TREE_CHAIN (parm) = NULL_TREE;
11529 nonparms = chainon (nonparms, parm);
11533 /* Get the decls in their original chain order and record in the
11534 function. This is all and only the PARM_DECLs that were
11535 pushed into scope by the loop above. */
11536 DECL_ARGUMENTS (fndecl) = getdecls ();
11539 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11541 /* Now store the final chain of decls for the arguments
11542 as the decl-chain of the current lexical scope.
11543 Put the enumerators in as well, at the front so that
11544 DECL_ARGUMENTS is not modified. */
11545 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11547 if (use_eh_spec_block (current_function_decl))
11548 current_eh_spec_block = begin_eh_spec_block ();
11552 /* We have finished doing semantic analysis on DECL, but have not yet
11553 generated RTL for its body. Save away our current state, so that
11554 when we want to generate RTL later we know what to do. */
11557 save_function_data (tree decl)
11559 struct language_function *f;
11561 /* Save the language-specific per-function data so that we can
11562 get it back when we really expand this function. */
11563 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11566 f = GGC_NEW (struct language_function);
11567 memcpy (f, cp_function_chain, sizeof (struct language_function));
11568 DECL_SAVED_FUNCTION_DATA (decl) = f;
11570 /* Clear out the bits we don't need. */
11571 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11572 f->bindings = NULL;
11573 f->x_local_names = NULL;
11577 /* Set the return value of the constructor (if present). */
11580 finish_constructor_body (void)
11585 if (targetm.cxx.cdtor_returns_this ())
11587 /* Any return from a constructor will end up here. */
11588 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11590 val = DECL_ARGUMENTS (current_function_decl);
11591 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11592 DECL_RESULT (current_function_decl), val);
11593 /* Return the address of the object. */
11594 exprstmt = build_stmt (RETURN_EXPR, val);
11595 add_stmt (exprstmt);
11599 /* Do all the processing for the beginning of a destructor; set up the
11600 vtable pointers and cleanups for bases and members. */
11603 begin_destructor_body (void)
11605 tree compound_stmt;
11607 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11608 issued an error message. We still want to try to process the
11609 body of the function, but initialize_vtbl_ptrs will crash if
11610 TYPE_BINFO is NULL. */
11611 if (COMPLETE_TYPE_P (current_class_type))
11613 compound_stmt = begin_compound_stmt (0);
11614 /* Make all virtual function table pointers in non-virtual base
11615 classes point to CURRENT_CLASS_TYPE's virtual function
11617 initialize_vtbl_ptrs (current_class_ptr);
11618 finish_compound_stmt (compound_stmt);
11620 /* And insert cleanups for our bases and members so that they
11621 will be properly destroyed if we throw. */
11622 push_base_cleanups ();
11626 /* At the end of every destructor we generate code to delete the object if
11627 necessary. Do that now. */
11630 finish_destructor_body (void)
11634 /* Any return from a destructor will end up here; that way all base
11635 and member cleanups will be run when the function returns. */
11636 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11638 /* In a virtual destructor, we must call delete. */
11639 if (DECL_VIRTUAL_P (current_function_decl))
11642 tree virtual_size = cxx_sizeof (current_class_type);
11646 At the point of definition of a virtual destructor (including
11647 an implicit definition), non-placement operator delete shall
11648 be looked up in the scope of the destructor's class and if
11649 found shall be accessible and unambiguous. */
11650 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
11652 /*global_p=*/false,
11653 /*placement=*/NULL_TREE,
11654 /*alloc_fn=*/NULL_TREE);
11656 if_stmt = begin_if_stmt ();
11657 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
11658 current_in_charge_parm,
11661 finish_expr_stmt (exprstmt);
11662 finish_then_clause (if_stmt);
11663 finish_if_stmt (if_stmt);
11666 if (targetm.cxx.cdtor_returns_this ())
11670 val = DECL_ARGUMENTS (current_function_decl);
11671 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11672 DECL_RESULT (current_function_decl), val);
11673 /* Return the address of the object. */
11674 exprstmt = build_stmt (RETURN_EXPR, val);
11675 add_stmt (exprstmt);
11679 /* Do the necessary processing for the beginning of a function body, which
11680 in this case includes member-initializers, but not the catch clauses of
11681 a function-try-block. Currently, this means opening a binding level
11682 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
11685 begin_function_body (void)
11689 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11692 if (processing_template_decl)
11693 /* Do nothing now. */;
11695 /* Always keep the BLOCK node associated with the outermost pair of
11696 curly braces of a function. These are needed for correct
11697 operation of dwarfout.c. */
11698 keep_next_level (true);
11700 stmt = begin_compound_stmt (BCS_FN_BODY);
11702 if (processing_template_decl)
11703 /* Do nothing now. */;
11704 else if (DECL_DESTRUCTOR_P (current_function_decl))
11705 begin_destructor_body ();
11710 /* Do the processing for the end of a function body. Currently, this means
11711 closing out the cleanups for fully-constructed bases and members, and in
11712 the case of the destructor, deleting the object if desired. Again, this
11713 is only meaningful for [cd]tors, since they are the only functions where
11714 there is a significant distinction between the main body and any
11715 function catch clauses. Handling, say, main() return semantics here
11716 would be wrong, as flowing off the end of a function catch clause for
11717 main() would also need to return 0. */
11720 finish_function_body (tree compstmt)
11722 if (compstmt == NULL_TREE)
11725 /* Close the block. */
11726 finish_compound_stmt (compstmt);
11728 if (processing_template_decl)
11729 /* Do nothing now. */;
11730 else if (DECL_CONSTRUCTOR_P (current_function_decl))
11731 finish_constructor_body ();
11732 else if (DECL_DESTRUCTOR_P (current_function_decl))
11733 finish_destructor_body ();
11736 /* Given a function, returns the BLOCK corresponding to the outermost level
11737 of curly braces, skipping the artificial block created for constructor
11741 outer_curly_brace_block (tree fndecl)
11743 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
11744 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
11745 /* Skip the artificial function body block. */
11746 block = BLOCK_SUBBLOCKS (block);
11750 /* Finish up a function declaration and compile that function
11751 all the way to assembler language output. The free the storage
11752 for the function definition.
11754 FLAGS is a bitwise or of the following values:
11756 We just finished processing the body of an in-class inline
11757 function definition. (This processing will have taken place
11758 after the class definition is complete.) */
11761 finish_function (int flags)
11763 tree fndecl = current_function_decl;
11764 tree fntype, ctype = NULL_TREE;
11765 int inclass_inline = (flags & 2) != 0;
11768 /* When we get some parse errors, we can end up without a
11769 current_function_decl, so cope. */
11770 if (fndecl == NULL_TREE)
11771 return error_mark_node;
11773 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
11774 && DECL_VIRTUAL_P (fndecl)
11775 && !processing_template_decl)
11777 tree fnclass = DECL_CONTEXT (fndecl);
11778 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
11779 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
11782 nested = function_depth > 1;
11783 fntype = TREE_TYPE (fndecl);
11785 /* TREE_READONLY (fndecl) = 1;
11786 This caused &foo to be of type ptr-to-const-function
11787 which then got a warning when stored in a ptr-to-function variable. */
11789 gcc_assert (building_stmt_tree ());
11790 /* The current function is being defined, so its DECL_INITIAL should
11791 be set, and unless there's a multiple definition, it should be
11792 error_mark_node. */
11793 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
11795 /* For a cloned function, we've already got all the code we need;
11796 there's no need to add any extra bits. */
11797 if (!DECL_CLONED_FUNCTION_P (fndecl))
11799 if (DECL_MAIN_P (current_function_decl))
11803 /* Make it so that `main' always returns 0 by default (or
11806 stmt = finish_return_stmt (integer_one_node);
11808 stmt = finish_return_stmt (integer_zero_node);
11810 /* Hack. We don't want the middle-end to warn that this
11811 return is unreachable, so put the statement on the
11814 location_t linezero = linemap_line_start (line_table, 0, 1);
11815 SET_EXPR_LOCATION (stmt, linezero);
11819 if (use_eh_spec_block (current_function_decl))
11820 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
11821 (TREE_TYPE (current_function_decl)),
11822 current_eh_spec_block);
11825 /* If we're saving up tree structure, tie off the function now. */
11826 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
11828 finish_fname_decls ();
11830 /* If this function can't throw any exceptions, remember that. */
11831 if (!processing_template_decl
11832 && !cp_function_chain->can_throw
11833 && !flag_non_call_exceptions
11834 && !DECL_REPLACEABLE_P (fndecl))
11835 TREE_NOTHROW (fndecl) = 1;
11837 /* This must come after expand_function_end because cleanups might
11838 have declarations (from inline functions) that need to go into
11839 this function's blocks. */
11841 /* If the current binding level isn't the outermost binding level
11842 for this function, either there is a bug, or we have experienced
11843 syntax errors and the statement tree is malformed. */
11844 if (current_binding_level->kind != sk_function_parms)
11846 /* Make sure we have already experienced errors. */
11847 gcc_assert (errorcount);
11849 /* Throw away the broken statement tree and extra binding
11851 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
11853 while (current_binding_level->kind != sk_function_parms)
11855 if (current_binding_level->kind == sk_class)
11856 pop_nested_class ();
11858 poplevel (0, 0, 0);
11861 poplevel (1, 0, 1);
11863 /* Statements should always be full-expressions at the outermost set
11864 of curly braces for a function. */
11865 gcc_assert (stmts_are_full_exprs_p ());
11867 /* Set up the named return value optimization, if we can. Candidate
11868 variables are selected in check_return_expr. */
11869 if (current_function_return_value)
11871 tree r = current_function_return_value;
11874 if (r != error_mark_node
11875 /* This is only worth doing for fns that return in memory--and
11876 simpler, since we don't have to worry about promoted modes. */
11877 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
11878 /* Only allow this for variables declared in the outer scope of
11879 the function so we know that their lifetime always ends with a
11880 return; see g++.dg/opt/nrv6.C. We could be more flexible if
11881 we were to do this optimization in tree-ssa. */
11882 && (outer = outer_curly_brace_block (fndecl))
11883 && chain_member (r, BLOCK_VARS (outer)))
11884 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
11886 current_function_return_value = NULL_TREE;
11889 /* Remember that we were in class scope. */
11890 if (current_class_name)
11891 ctype = current_class_type;
11893 /* Must mark the RESULT_DECL as being in this function. */
11894 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
11896 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
11897 to the FUNCTION_DECL node itself. */
11898 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
11900 /* Save away current state, if appropriate. */
11901 if (!processing_template_decl)
11902 save_function_data (fndecl);
11904 /* Complain if there's just no return statement. */
11905 if (warn_return_type
11906 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
11907 && !dependent_type_p (TREE_TYPE (fntype))
11908 && !current_function_returns_value && !current_function_returns_null
11909 /* Don't complain if we abort or throw. */
11910 && !current_function_returns_abnormally
11911 && !DECL_NAME (DECL_RESULT (fndecl))
11912 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
11913 inline function, as we might never be compiled separately. */
11914 && (DECL_INLINE (fndecl) || processing_template_decl)
11915 /* Structor return values (if any) are set by the compiler. */
11916 && !DECL_CONSTRUCTOR_P (fndecl)
11917 && !DECL_DESTRUCTOR_P (fndecl))
11918 warning (OPT_Wreturn_type, "no return statement in function returning non-void");
11920 /* Store the end of the function, so that we get good line number
11921 info for the epilogue. */
11922 cfun->function_end_locus = input_location;
11924 /* Genericize before inlining. */
11925 if (!processing_template_decl)
11927 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
11928 cp_genericize (fndecl);
11929 /* Clear out the bits we don't need. */
11930 f->x_current_class_ptr = NULL;
11931 f->x_current_class_ref = NULL;
11932 f->x_eh_spec_block = NULL;
11933 f->x_in_charge_parm = NULL;
11934 f->x_vtt_parm = NULL;
11935 f->x_return_value = NULL;
11936 f->bindings = NULL;
11937 f->extern_decl_map = NULL;
11939 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
11940 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
11942 /* Clear out the bits we don't need. */
11943 local_names = NULL;
11945 /* We're leaving the context of this function, so zap cfun. It's still in
11946 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
11948 current_function_decl = NULL;
11950 /* If this is an in-class inline definition, we may have to pop the
11951 bindings for the template parameters that we added in
11952 maybe_begin_member_template_processing when start_function was
11954 if (inclass_inline)
11955 maybe_end_member_template_processing ();
11957 /* Leave the scope of the class. */
11959 pop_nested_class ();
11965 /* Let the error reporting routines know that we're outside a
11966 function. For a nested function, this value is used in
11967 cxx_pop_function_context and then reset via pop_function_context. */
11968 current_function_decl = NULL_TREE;
11973 /* Create the FUNCTION_DECL for a function definition.
11974 DECLSPECS and DECLARATOR are the parts of the declaration;
11975 they describe the return type and the name of the function,
11976 but twisted together in a fashion that parallels the syntax of C.
11978 This function creates a binding context for the function body
11979 as well as setting up the FUNCTION_DECL in current_function_decl.
11981 Returns a FUNCTION_DECL on success.
11983 If the DECLARATOR is not suitable for a function (it defines a datum
11984 instead), we return 0, which tells yyparse to report a parse error.
11986 May return void_type_node indicating that this method is actually
11987 a friend. See grokfield for more details.
11989 Came here with a `.pushlevel' .
11991 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
11992 CHANGES TO CODE IN `grokfield'. */
11995 start_method (cp_decl_specifier_seq *declspecs,
11996 const cp_declarator *declarator, tree attrlist)
11998 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12001 if (fndecl == error_mark_node)
12002 return error_mark_node;
12004 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12006 error ("invalid member function declaration");
12007 return error_mark_node;
12011 cplus_decl_attributes (&fndecl, attrlist, 0);
12013 /* Pass friends other than inline friend functions back. */
12014 if (fndecl == void_type_node)
12017 if (DECL_IN_AGGR_P (fndecl))
12019 if (DECL_CONTEXT (fndecl)
12020 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12021 error ("%qD is already defined in class %qT", fndecl,
12022 DECL_CONTEXT (fndecl));
12023 return error_mark_node;
12026 check_template_shadow (fndecl);
12028 DECL_DECLARED_INLINE_P (fndecl) = 1;
12029 if (flag_default_inline)
12030 DECL_INLINE (fndecl) = 1;
12032 /* We process method specializations in finish_struct_1. */
12033 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12035 fndecl = push_template_decl (fndecl);
12036 if (fndecl == error_mark_node)
12040 if (! DECL_FRIEND_P (fndecl))
12042 if (TREE_CHAIN (fndecl))
12044 fndecl = copy_node (fndecl);
12045 TREE_CHAIN (fndecl) = NULL_TREE;
12049 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12051 /* Make a place for the parms. */
12052 begin_scope (sk_function_parms, fndecl);
12054 DECL_IN_AGGR_P (fndecl) = 1;
12058 /* Go through the motions of finishing a function definition.
12059 We don't compile this method until after the whole class has
12062 FINISH_METHOD must return something that looks as though it
12063 came from GROKFIELD (since we are defining a method, after all).
12065 This is called after parsing the body of the function definition.
12066 STMTS is the chain of statements that makes up the function body.
12068 DECL is the ..._DECL that `start_method' provided. */
12071 finish_method (tree decl)
12073 tree fndecl = decl;
12078 if (decl == void_type_node)
12081 old_initial = DECL_INITIAL (fndecl);
12083 /* Undo the level for the parms (from start_method).
12084 This is like poplevel, but it causes nothing to be
12085 saved. Saving information here confuses symbol-table
12086 output routines. Besides, this information will
12087 be correctly output when this method is actually
12090 /* Clear out the meanings of the local variables of this level;
12091 also record in each decl which block it belongs to. */
12093 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12095 if (DECL_NAME (link) != NULL_TREE)
12096 pop_binding (DECL_NAME (link), link);
12097 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12098 DECL_CONTEXT (link) = NULL_TREE;
12101 poplevel (0, 0, 0);
12103 DECL_INITIAL (fndecl) = old_initial;
12105 /* We used to check if the context of FNDECL was different from
12106 current_class_type as another way to get inside here. This didn't work
12107 for String.cc in libg++. */
12108 if (DECL_FRIEND_P (fndecl))
12110 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12112 decl = void_type_node;
12119 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12120 we can lay it out later, when and if its type becomes complete. */
12123 maybe_register_incomplete_var (tree var)
12125 gcc_assert (TREE_CODE (var) == VAR_DECL);
12127 /* Keep track of variables with incomplete types. */
12128 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12129 && DECL_EXTERNAL (var))
12131 tree inner_type = TREE_TYPE (var);
12133 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12134 inner_type = TREE_TYPE (inner_type);
12135 inner_type = TYPE_MAIN_VARIANT (inner_type);
12137 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12138 /* RTTI TD entries are created while defining the type_info. */
12139 || (TYPE_LANG_SPECIFIC (inner_type)
12140 && TYPE_BEING_DEFINED (inner_type)))
12141 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12145 /* Called when a class type (given by TYPE) is defined. If there are
12146 any existing VAR_DECLs whose type hsa been completed by this
12147 declaration, update them now. */
12150 complete_vars (tree type)
12152 tree *list = &incomplete_vars;
12154 gcc_assert (CLASS_TYPE_P (type));
12157 if (same_type_p (type, TREE_PURPOSE (*list)))
12159 tree var = TREE_VALUE (*list);
12160 tree type = TREE_TYPE (var);
12161 /* Complete the type of the variable. The VAR_DECL itself
12162 will be laid out in expand_expr. */
12163 complete_type (type);
12164 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12165 /* Remove this entry from the list. */
12166 *list = TREE_CHAIN (*list);
12169 list = &TREE_CHAIN (*list);
12172 /* Check for pending declarations which may have abstract type. */
12173 complete_type_check_abstract (type);
12176 /* If DECL is of a type which needs a cleanup, build and return an
12177 expression to perform that cleanup here. Return NULL_TREE if no
12178 cleanup need be done. */
12181 cxx_maybe_build_cleanup (tree decl)
12187 /* Assume no cleanup is required. */
12188 cleanup = NULL_TREE;
12190 if (error_operand_p (decl))
12193 /* Handle "__attribute__((cleanup))". We run the cleanup function
12194 before the destructor since the destructor is what actually
12195 terminates the lifetime of the object. */
12196 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12203 /* Get the name specified by the user for the cleanup function. */
12204 id = TREE_VALUE (TREE_VALUE (attr));
12205 /* Look up the name to find the cleanup function to call. It is
12206 important to use lookup_name here because that is what is
12207 used in c-common.c:handle_cleanup_attribute when performing
12208 initial checks on the attribute. Note that those checks
12209 include ensuring that the function found is not an overloaded
12210 function, or an object with an overloaded call operator,
12211 etc.; we can rely on the fact that the functionfound is an
12212 ordinary FUNCTION_DECL. */
12213 fn = lookup_name (id);
12214 arg = build_address (decl);
12216 cleanup = build_function_call (fn, build_tree_list (NULL_TREE,
12219 /* Handle ordinary C++ destructors. */
12220 type = TREE_TYPE (decl);
12221 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12223 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12224 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12225 && CLASSTYPE_VBASECLASSES (type));
12229 if (TREE_CODE (type) == ARRAY_TYPE)
12232 addr = build_address (decl);
12234 /* Optimize for space over speed here. */
12235 if (!has_vbases || flag_expensive_optimizations)
12236 flags |= LOOKUP_NONVIRTUAL;
12238 call = build_delete (TREE_TYPE (addr), addr,
12239 sfk_complete_destructor, flags, 0);
12241 cleanup = build_compound_expr (cleanup, call);
12249 /* When a stmt has been parsed, this function is called. */
12256 /* DECL was originally constructed as a non-static member function,
12257 but turned out to be static. Update it accordingly. */
12260 revert_static_member_fn (tree decl)
12263 tree function = TREE_TYPE (decl);
12264 tree args = TYPE_ARG_TYPES (function);
12266 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12267 != TYPE_UNQUALIFIED)
12268 error ("static member function %q#D declared with type qualifiers", decl);
12270 args = TREE_CHAIN (args);
12271 tmp = build_function_type (TREE_TYPE (function), args);
12272 tmp = build_qualified_type (tmp, cp_type_quals (function));
12273 tmp = build_exception_variant (tmp,
12274 TYPE_RAISES_EXCEPTIONS (function));
12275 TREE_TYPE (decl) = tmp;
12276 if (DECL_ARGUMENTS (decl))
12277 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12278 DECL_STATIC_FUNCTION_P (decl) = 1;
12281 /* Initialize the variables used during compilation of a C++
12285 cxx_push_function_context (struct function * f)
12287 struct language_function *p = GGC_CNEW (struct language_function);
12290 /* Whenever we start a new function, we destroy temporaries in the
12292 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
12298 if (DECL_SAVED_FUNCTION_DATA (fn))
12300 /* If we already parsed this function, and we're just expanding it
12301 now, restore saved state. */
12302 *cp_function_chain = *DECL_SAVED_FUNCTION_DATA (fn);
12304 /* We don't need the saved data anymore. Unless this is an inline
12305 function; we need the named return value info for
12306 declare_return_variable. */
12307 if (! DECL_INLINE (fn))
12308 DECL_SAVED_FUNCTION_DATA (fn) = NULL;
12313 /* Free the language-specific parts of F, now that we've finished
12314 compiling the function. */
12317 cxx_pop_function_context (struct function * f)
12322 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12323 one of the language-independent trees. */
12325 enum cp_tree_node_structure_enum
12326 cp_tree_node_structure (union lang_tree_node * t)
12328 switch (TREE_CODE (&t->generic))
12330 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12331 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12332 case OVERLOAD: return TS_CP_OVERLOAD;
12333 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12334 case PTRMEM_CST: return TS_CP_PTRMEM;
12335 case BASELINK: return TS_CP_BASELINK;
12336 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12337 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12338 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12339 default: return TS_CP_GENERIC;
12343 /* Build the void_list_node (void_type_node having been created). */
12345 build_void_list_node (void)
12347 tree t = build_tree_list (NULL_TREE, void_type_node);
12352 cp_missing_noreturn_ok_p (tree decl)
12354 /* A missing noreturn is ok for the `main' function. */
12355 return DECL_MAIN_P (decl);
12358 /* Return the COMDAT group into which DECL should be placed. */
12361 cxx_comdat_group (tree decl)
12365 /* Virtual tables, construction virtual tables, and virtual table
12366 tables all go in a single COMDAT group, named after the primary
12368 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12369 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12370 /* For all other DECLs, the COMDAT group is the mangled name of the
12371 declaration itself. */
12374 while (DECL_THUNK_P (decl))
12376 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12377 into the same section as the target function. In that case
12378 we must return target's name. */
12379 tree target = THUNK_TARGET (decl);
12380 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12381 && DECL_SECTION_NAME (target) != NULL
12382 && DECL_ONE_ONLY (target))
12387 name = DECL_ASSEMBLER_NAME (decl);
12390 return IDENTIFIER_POINTER (name);
12393 #include "gt-cp-decl.h"