1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
40 #include "tree-inline.h"
50 #include "diagnostic.h"
54 #include "tree-flow.h"
55 #include "pointer-set.h"
57 static tree grokparms (tree parmlist, 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, bool);
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 /* To avoid unwanted recursion, finish_function defers all mark_used calls
231 encountered during its execution until it finishes. */
232 bool defer_mark_used_calls;
233 VEC(tree, gc) *deferred_mark_used_calls;
235 /* States indicating how grokdeclarator() should handle declspecs marked
236 with __attribute__((deprecated)). An object declared as
237 __attribute__((deprecated)) suppresses warnings of uses of other
239 enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
242 /* A TREE_LIST of VAR_DECLs. The TREE_PURPOSE is a RECORD_TYPE or
243 UNION_TYPE; the TREE_VALUE is a VAR_DECL with that type. At the
244 time the VAR_DECL was declared, the type was incomplete. */
246 static GTY(()) tree incomplete_vars;
248 /* Returns the kind of template specialization we are currently
249 processing, given that it's declaration contained N_CLASS_SCOPES
250 explicit scope qualifications. */
253 current_tmpl_spec_kind (int n_class_scopes)
255 int n_template_parm_scopes = 0;
256 int seen_specialization_p = 0;
257 int innermost_specialization_p = 0;
258 struct cp_binding_level *b;
260 /* Scan through the template parameter scopes. */
261 for (b = current_binding_level;
262 b->kind == sk_template_parms;
265 /* If we see a specialization scope inside a parameter scope,
266 then something is wrong. That corresponds to a declaration
269 template <class T> template <> ...
271 which is always invalid since [temp.expl.spec] forbids the
272 specialization of a class member template if the enclosing
273 class templates are not explicitly specialized as well. */
274 if (b->explicit_spec_p)
276 if (n_template_parm_scopes == 0)
277 innermost_specialization_p = 1;
279 seen_specialization_p = 1;
281 else if (seen_specialization_p == 1)
282 return tsk_invalid_member_spec;
284 ++n_template_parm_scopes;
287 /* Handle explicit instantiations. */
288 if (processing_explicit_instantiation)
290 if (n_template_parm_scopes != 0)
291 /* We've seen a template parameter list during an explicit
292 instantiation. For example:
294 template <class T> template void f(int);
296 This is erroneous. */
297 return tsk_invalid_expl_inst;
299 return tsk_expl_inst;
302 if (n_template_parm_scopes < n_class_scopes)
303 /* We've not seen enough template headers to match all the
304 specialized classes present. For example:
306 template <class T> void R<T>::S<T>::f(int);
308 This is invalid; there needs to be one set of template
309 parameters for each class. */
310 return tsk_insufficient_parms;
311 else if (n_template_parm_scopes == n_class_scopes)
312 /* We're processing a non-template declaration (even though it may
313 be a member of a template class.) For example:
315 template <class T> void S<T>::f(int);
317 The `class T' matches the `S<T>', leaving no template headers
318 corresponding to the `f'. */
320 else if (n_template_parm_scopes > n_class_scopes + 1)
321 /* We've got too many template headers. For example:
323 template <> template <class T> void f (T);
325 There need to be more enclosing classes. */
326 return tsk_excessive_parms;
328 /* This must be a template. It's of the form:
330 template <class T> template <class U> void S<T>::f(U);
332 This is a specialization if the innermost level was a
333 specialization; otherwise it's just a definition of the
335 return innermost_specialization_p ? tsk_expl_spec : tsk_template;
338 /* Exit the current scope. */
346 /* When a label goes out of scope, check to see if that label was used
347 in a valid manner, and issue any appropriate warnings or errors. */
350 pop_label (tree label, tree old_value)
352 if (!processing_template_decl)
354 if (DECL_INITIAL (label) == NULL_TREE)
358 error ("label %q+D used but not defined", label);
359 location = input_location; /* FIXME want (input_filename, (line)0) */
360 /* Avoid crashing later. */
361 define_label (location, DECL_NAME (label));
364 warn_for_unused_label (label);
367 SET_IDENTIFIER_LABEL_VALUE (DECL_NAME (label), old_value);
370 /* At the end of a function, all labels declared within the function
371 go out of scope. BLOCK is the top-level block for the
375 pop_labels_1 (void **slot, void *data)
377 struct named_label_entry *ent = (struct named_label_entry *) *slot;
378 tree block = (tree) data;
380 pop_label (ent->label_decl, NULL_TREE);
382 /* Put the labels into the "variables" of the top-level block,
383 so debugger can see them. */
384 TREE_CHAIN (ent->label_decl) = BLOCK_VARS (block);
385 BLOCK_VARS (block) = ent->label_decl;
387 htab_clear_slot (named_labels, slot);
393 pop_labels (tree block)
397 htab_traverse (named_labels, pop_labels_1, block);
402 /* At the end of a block with local labels, restore the outer definition. */
405 pop_local_label (tree label, tree old_value)
407 struct named_label_entry dummy;
410 pop_label (label, old_value);
412 dummy.label_decl = label;
413 slot = htab_find_slot (named_labels, &dummy, NO_INSERT);
414 htab_clear_slot (named_labels, slot);
417 /* The following two routines are used to interface to Objective-C++.
418 The binding level is purposely treated as an opaque type. */
421 objc_get_current_scope (void)
423 return current_binding_level;
426 /* The following routine is used by the NeXT-style SJLJ exceptions;
427 variables get marked 'volatile' so as to not be clobbered by
428 _setjmp()/_longjmp() calls. All variables in the current scope,
429 as well as parent scopes up to (but not including) ENCLOSING_BLK
430 shall be thusly marked. */
433 objc_mark_locals_volatile (void *enclosing_blk)
435 struct cp_binding_level *scope;
437 for (scope = current_binding_level;
438 scope && scope != enclosing_blk;
439 scope = scope->level_chain)
443 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
444 objc_volatilize_decl (decl);
446 /* Do not climb up past the current function. */
447 if (scope->kind == sk_function_parms)
452 /* Update data for defined and undefined labels when leaving a scope. */
455 poplevel_named_label_1 (void **slot, void *data)
457 struct named_label_entry *ent = (struct named_label_entry *) *slot;
458 struct cp_binding_level *bl = (struct cp_binding_level *) data;
459 struct cp_binding_level *obl = bl->level_chain;
461 if (ent->binding_level == bl)
465 for (decl = ent->names_in_scope; decl; decl = TREE_CHAIN (decl))
466 if (decl_jump_unsafe (decl))
467 ent->bad_decls = tree_cons (NULL, decl, ent->bad_decls);
469 ent->binding_level = obl;
470 ent->names_in_scope = obl->names;
474 ent->in_try_scope = true;
477 ent->in_catch_scope = true;
480 ent->in_omp_scope = true;
488 struct named_label_use_entry *use;
490 for (use = ent->uses; use ; use = use->next)
491 if (use->binding_level == bl)
493 use->binding_level = obl;
494 use->names_in_scope = obl->names;
495 if (bl->kind == sk_omp)
496 use->in_omp_scope = true;
503 /* Exit a binding level.
504 Pop the level off, and restore the state of the identifier-decl mappings
505 that were in effect when this level was entered.
507 If KEEP == 1, this level had explicit declarations, so
508 and create a "block" (a BLOCK node) for the level
509 to record its declarations and subblocks for symbol table output.
511 If FUNCTIONBODY is nonzero, this level is the body of a function,
512 so create a block as if KEEP were set and also clear out all
515 If REVERSE is nonzero, reverse the order of decls before putting
516 them into the BLOCK. */
519 poplevel (int keep, int reverse, int functionbody)
522 /* The chain of decls was accumulated in reverse order.
523 Put it into forward order, just for cleanliness. */
525 int tmp = functionbody;
526 int real_functionbody;
530 int leaving_for_scope;
533 timevar_push (TV_NAME_LOOKUP);
538 gcc_assert (current_binding_level->kind != sk_class);
540 real_functionbody = (current_binding_level->kind == sk_cleanup
541 ? ((functionbody = 0), tmp) : functionbody);
542 subblocks = functionbody >= 0 ? current_binding_level->blocks : 0;
544 gcc_assert (!VEC_length(cp_class_binding,
545 current_binding_level->class_shadowed));
547 /* We used to use KEEP == 2 to indicate that the new block should go
548 at the beginning of the list of blocks at this binding level,
549 rather than the end. This hack is no longer used. */
550 gcc_assert (keep == 0 || keep == 1);
552 if (current_binding_level->keep)
555 /* Any uses of undefined labels, and any defined labels, now operate
556 under constraints of next binding contour. */
557 if (cfun && !functionbody && named_labels)
558 htab_traverse (named_labels, poplevel_named_label_1,
559 current_binding_level);
561 /* Get the decls in the order they were written.
562 Usually current_binding_level->names is in reverse order.
563 But parameter decls were previously put in forward order. */
566 current_binding_level->names
567 = decls = nreverse (current_binding_level->names);
569 decls = current_binding_level->names;
571 /* If there were any declarations or structure tags in that level,
572 or if this level is a function body,
573 create a BLOCK to record them for the life of this function. */
575 if (keep == 1 || functionbody)
576 block = make_node (BLOCK);
577 if (block != NULL_TREE)
579 BLOCK_VARS (block) = decls;
580 BLOCK_SUBBLOCKS (block) = subblocks;
583 /* In each subblock, record that this is its superior. */
585 for (link = subblocks; link; link = BLOCK_CHAIN (link))
586 BLOCK_SUPERCONTEXT (link) = block;
588 /* We still support the old for-scope rules, whereby the variables
589 in a for-init statement were in scope after the for-statement
590 ended. We only use the new rules if flag_new_for_scope is
593 = current_binding_level->kind == sk_for && flag_new_for_scope == 1;
595 /* Before we remove the declarations first check for unused variables. */
596 if (warn_unused_variable
597 && !processing_template_decl)
598 for (decl = getdecls (); decl; decl = TREE_CHAIN (decl))
599 if (TREE_CODE (decl) == VAR_DECL
600 && ! TREE_USED (decl)
601 && ! DECL_IN_SYSTEM_HEADER (decl)
602 && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl))
603 warning (OPT_Wunused_variable, "unused variable %q+D", decl);
605 /* Remove declarations for all the DECLs in this level. */
606 for (link = decls; link; link = TREE_CHAIN (link))
608 if (leaving_for_scope && TREE_CODE (link) == VAR_DECL
611 tree name = DECL_NAME (link);
615 ob = outer_binding (name,
616 IDENTIFIER_BINDING (name),
619 ns_binding = IDENTIFIER_NAMESPACE_VALUE (name);
621 ns_binding = NULL_TREE;
623 if (ob && ob->scope == current_binding_level->level_chain)
624 /* We have something like:
629 and we are leaving the `for' scope. There's no reason to
630 keep the binding of the inner `i' in this case. */
631 pop_binding (name, link);
632 else if ((ob && (TREE_CODE (ob->value) == TYPE_DECL))
633 || (ns_binding && TREE_CODE (ns_binding) == TYPE_DECL))
634 /* Here, we have something like:
642 We must pop the for-scope binding so we know what's a
643 type and what isn't. */
644 pop_binding (name, link);
647 /* Mark this VAR_DECL as dead so that we can tell we left it
648 there only for backward compatibility. */
649 DECL_DEAD_FOR_LOCAL (link) = 1;
651 /* Keep track of what should have happened when we
652 popped the binding. */
655 SET_DECL_SHADOWED_FOR_VAR (link, ob->value);
656 DECL_HAS_SHADOWED_FOR_VAR_P (link) = 1;
659 /* Add it to the list of dead variables in the next
660 outermost binding to that we can remove these when we
661 leave that binding. */
662 current_binding_level->level_chain->dead_vars_from_for
663 = tree_cons (NULL_TREE, link,
664 current_binding_level->level_chain->
667 /* Although we don't pop the cxx_binding, we do clear
668 its SCOPE since the scope is going away now. */
669 IDENTIFIER_BINDING (name)->scope
670 = current_binding_level->level_chain;
677 /* Remove the binding. */
680 if (TREE_CODE (decl) == TREE_LIST)
681 decl = TREE_VALUE (decl);
684 if (TREE_CODE (name) == OVERLOAD)
685 name = OVL_FUNCTION (name);
687 gcc_assert (DECL_P (name));
688 pop_binding (DECL_NAME (name), decl);
692 /* Remove declarations for any `for' variables from inner scopes
693 that we kept around. */
694 for (link = current_binding_level->dead_vars_from_for;
695 link; link = TREE_CHAIN (link))
696 pop_binding (DECL_NAME (TREE_VALUE (link)), TREE_VALUE (link));
698 /* Restore the IDENTIFIER_TYPE_VALUEs. */
699 for (link = current_binding_level->type_shadowed;
700 link; link = TREE_CHAIN (link))
701 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (link), TREE_VALUE (link));
703 /* Restore the IDENTIFIER_LABEL_VALUEs for local labels. */
704 for (link = current_binding_level->shadowed_labels;
706 link = TREE_CHAIN (link))
707 pop_local_label (TREE_VALUE (link), TREE_PURPOSE (link));
709 /* There may be OVERLOADs (wrapped in TREE_LISTs) on the BLOCK_VARs
710 list if a `using' declaration put them there. The debugging
711 back ends won't understand OVERLOAD, so we remove them here.
712 Because the BLOCK_VARS are (temporarily) shared with
713 CURRENT_BINDING_LEVEL->NAMES we must do this fixup after we have
714 popped all the bindings. */
719 for (d = &BLOCK_VARS (block); *d; )
721 if (TREE_CODE (*d) == TREE_LIST)
722 *d = TREE_CHAIN (*d);
724 d = &TREE_CHAIN (*d);
728 /* If the level being exited is the top level of a function,
729 check over all the labels. */
732 /* Since this is the top level block of a function, the vars are
733 the function's parameters. Don't leave them in the BLOCK
734 because they are found in the FUNCTION_DECL instead. */
735 BLOCK_VARS (block) = 0;
739 kind = current_binding_level->kind;
740 if (kind == sk_cleanup)
744 /* If this is a temporary binding created for a cleanup, then we'll
745 have pushed a statement list level. Pop that, create a new
746 BIND_EXPR for the block, and insert it into the stream. */
747 stmt = pop_stmt_list (current_binding_level->statement_list);
748 stmt = c_build_bind_expr (block, stmt);
755 /* The current function is being defined, so its DECL_INITIAL
756 should be error_mark_node. */
757 gcc_assert (DECL_INITIAL (current_function_decl) == error_mark_node);
758 DECL_INITIAL (current_function_decl) = block;
761 current_binding_level->blocks
762 = chainon (current_binding_level->blocks, block);
764 /* If we did not make a block for the level just exited,
765 any blocks made for inner levels
766 (since they cannot be recorded as subblocks in that level)
767 must be carried forward so they will later become subblocks
768 of something else. */
770 current_binding_level->blocks
771 = chainon (current_binding_level->blocks, subblocks);
773 /* Each and every BLOCK node created here in `poplevel' is important
774 (e.g. for proper debugging information) so if we created one
775 earlier, mark it as "used". */
777 TREE_USED (block) = 1;
779 /* All temporary bindings created for cleanups are popped silently. */
780 if (kind == sk_cleanup)
783 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, block);
786 /* Insert BLOCK at the end of the list of subblocks of the
787 current binding level. This is used when a BIND_EXPR is expanded,
788 to handle the BLOCK node inside the BIND_EXPR. */
791 insert_block (tree block)
793 TREE_USED (block) = 1;
794 current_binding_level->blocks
795 = chainon (current_binding_level->blocks, block);
798 /* Walk all the namespaces contained NAMESPACE, including NAMESPACE
799 itself, calling F for each. The DATA is passed to F as well. */
802 walk_namespaces_r (tree name_space, walk_namespaces_fn f, void* data)
805 tree current = NAMESPACE_LEVEL (name_space)->namespaces;
807 result |= (*f) (name_space, data);
809 for (; current; current = TREE_CHAIN (current))
810 result |= walk_namespaces_r (current, f, data);
815 /* Walk all the namespaces, calling F for each. The DATA is passed to
819 walk_namespaces (walk_namespaces_fn f, void* data)
821 return walk_namespaces_r (global_namespace, f, data);
824 /* Call wrapup_globals_declarations for the globals in NAMESPACE. If
825 DATA is non-NULL, this is the last time we will call
826 wrapup_global_declarations for this NAMESPACE. */
829 wrapup_globals_for_namespace (tree name_space, void* data)
831 struct cp_binding_level *level = NAMESPACE_LEVEL (name_space);
832 VEC(tree,gc) *statics = level->static_decls;
833 tree *vec = VEC_address (tree, statics);
834 int len = VEC_length (tree, statics);
835 int last_time = (data != 0);
839 check_global_declarations (vec, len);
840 emit_debug_global_declarations (vec, len);
844 /* Write out any globals that need to be output. */
845 return wrapup_global_declarations (vec, len);
849 /* In C++, you don't have to write `struct S' to refer to `S'; you
850 can just use `S'. We accomplish this by creating a TYPE_DECL as
851 if the user had written `typedef struct S S'. Create and return
852 the TYPE_DECL for TYPE. */
855 create_implicit_typedef (tree name, tree type)
859 decl = build_decl (TYPE_DECL, name, type);
860 DECL_ARTIFICIAL (decl) = 1;
861 /* There are other implicit type declarations, like the one *within*
862 a class that allows you to write `S::S'. We must distinguish
864 SET_DECL_IMPLICIT_TYPEDEF_P (decl);
865 TYPE_NAME (type) = decl;
870 /* Remember a local name for name-mangling purposes. */
873 push_local_name (tree decl)
878 timevar_push (TV_NAME_LOOKUP);
880 name = DECL_NAME (decl);
882 nelts = VEC_length (tree, local_names);
883 for (i = 0; i < nelts; i++)
885 t = VEC_index (tree, local_names, i);
886 if (DECL_NAME (t) == name)
888 if (!DECL_LANG_SPECIFIC (decl))
889 retrofit_lang_decl (decl);
890 DECL_LANG_SPECIFIC (decl)->decl_flags.u2sel = 1;
891 if (DECL_LANG_SPECIFIC (t))
892 DECL_DISCRIMINATOR (decl) = DECL_DISCRIMINATOR (t) + 1;
894 DECL_DISCRIMINATOR (decl) = 1;
896 VEC_replace (tree, local_names, i, decl);
897 timevar_pop (TV_NAME_LOOKUP);
902 VEC_safe_push (tree, gc, local_names, decl);
903 timevar_pop (TV_NAME_LOOKUP);
906 /* Subroutine of duplicate_decls: return truthvalue of whether
907 or not types of these decls match.
909 For C++, we must compare the parameter list so that `int' can match
910 `int&' in a parameter position, but `int&' is not confused with
914 decls_match (tree newdecl, tree olddecl)
918 if (newdecl == olddecl)
921 if (TREE_CODE (newdecl) != TREE_CODE (olddecl))
922 /* If the two DECLs are not even the same kind of thing, we're not
923 interested in their types. */
926 if (TREE_CODE (newdecl) == FUNCTION_DECL)
928 tree f1 = TREE_TYPE (newdecl);
929 tree f2 = TREE_TYPE (olddecl);
930 tree p1 = TYPE_ARG_TYPES (f1);
931 tree p2 = TYPE_ARG_TYPES (f2);
933 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
934 && ! (DECL_EXTERN_C_P (newdecl)
935 && DECL_EXTERN_C_P (olddecl)))
938 if (TREE_CODE (f1) != TREE_CODE (f2))
941 if (same_type_p (TREE_TYPE (f1), TREE_TYPE (f2)))
943 if (p2 == NULL_TREE && DECL_EXTERN_C_P (olddecl)
944 && (DECL_BUILT_IN (olddecl)
945 #ifndef NO_IMPLICIT_EXTERN_C
946 || (DECL_IN_SYSTEM_HEADER (newdecl) && !DECL_CLASS_SCOPE_P (newdecl))
947 || (DECL_IN_SYSTEM_HEADER (olddecl) && !DECL_CLASS_SCOPE_P (olddecl))
951 types_match = self_promoting_args_p (p1);
952 if (p1 == void_list_node)
953 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
955 #ifndef NO_IMPLICIT_EXTERN_C
956 else if (p1 == NULL_TREE
957 && (DECL_EXTERN_C_P (olddecl)
958 && DECL_IN_SYSTEM_HEADER (olddecl)
959 && !DECL_CLASS_SCOPE_P (olddecl))
960 && (DECL_EXTERN_C_P (newdecl)
961 && DECL_IN_SYSTEM_HEADER (newdecl)
962 && !DECL_CLASS_SCOPE_P (newdecl)))
964 types_match = self_promoting_args_p (p2);
965 TREE_TYPE (newdecl) = TREE_TYPE (olddecl);
969 types_match = compparms (p1, p2);
974 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
976 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl))
977 != TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)))
980 if (!comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
981 DECL_TEMPLATE_PARMS (olddecl)))
984 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
985 types_match = same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl)),
986 TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl)));
988 types_match = decls_match (DECL_TEMPLATE_RESULT (olddecl),
989 DECL_TEMPLATE_RESULT (newdecl));
993 /* Need to check scope for variable declaration (VAR_DECL).
994 For typedef (TYPE_DECL), scope is ignored. */
995 if (TREE_CODE (newdecl) == VAR_DECL
996 && CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl)
998 Two declarations for an object with C language linkage
999 with the same name (ignoring the namespace that qualify
1000 it) that appear in different namespace scopes refer to
1002 && !(DECL_EXTERN_C_P (olddecl) && DECL_EXTERN_C_P (newdecl)))
1005 if (TREE_TYPE (newdecl) == error_mark_node)
1006 types_match = TREE_TYPE (olddecl) == error_mark_node;
1007 else if (TREE_TYPE (olddecl) == NULL_TREE)
1008 types_match = TREE_TYPE (newdecl) == NULL_TREE;
1009 else if (TREE_TYPE (newdecl) == NULL_TREE)
1012 types_match = comptypes (TREE_TYPE (newdecl),
1013 TREE_TYPE (olddecl),
1014 COMPARE_REDECLARATION);
1020 /* If NEWDECL is `static' and an `extern' was seen previously,
1021 warn about it. OLDDECL is the previous declaration.
1023 Note that this does not apply to the C++ case of declaring
1024 a variable `extern const' and then later `const'.
1026 Don't complain about built-in functions, since they are beyond
1027 the user's control. */
1030 warn_extern_redeclared_static (tree newdecl, tree olddecl)
1034 if (TREE_CODE (newdecl) == TYPE_DECL
1035 || TREE_CODE (newdecl) == TEMPLATE_DECL
1036 || TREE_CODE (newdecl) == CONST_DECL
1037 || TREE_CODE (newdecl) == NAMESPACE_DECL)
1040 /* Don't get confused by static member functions; that's a different
1042 if (TREE_CODE (newdecl) == FUNCTION_DECL
1043 && DECL_STATIC_FUNCTION_P (newdecl))
1046 /* If the old declaration was `static', or the new one isn't, then
1047 then everything is OK. */
1048 if (DECL_THIS_STATIC (olddecl) || !DECL_THIS_STATIC (newdecl))
1051 /* It's OK to declare a builtin function as `static'. */
1052 if (TREE_CODE (olddecl) == FUNCTION_DECL
1053 && DECL_ARTIFICIAL (olddecl))
1056 name = DECL_ASSEMBLER_NAME (newdecl);
1057 permerror (input_location, "%qD was declared %<extern%> and later %<static%>", newdecl);
1058 permerror (input_location, "previous declaration of %q+D", olddecl);
1061 /* NEW_DECL is a redeclaration of OLD_DECL; both are functions or
1062 function templates. If their exception specifications do not
1063 match, issue a diagnostic. */
1066 check_redeclaration_exception_specification (tree new_decl,
1071 tree new_exceptions;
1072 tree old_exceptions;
1074 new_type = TREE_TYPE (new_decl);
1075 new_exceptions = TYPE_RAISES_EXCEPTIONS (new_type);
1076 old_type = TREE_TYPE (old_decl);
1077 old_exceptions = TYPE_RAISES_EXCEPTIONS (old_type);
1081 If any declaration of a function has an exception-specification,
1082 all declarations, including the definition and an explicit
1083 specialization, of that function shall have an
1084 exception-specification with the same set of type-ids. */
1085 if ((pedantic || ! DECL_IN_SYSTEM_HEADER (old_decl))
1086 && ! DECL_IS_BUILTIN (old_decl)
1088 && !comp_except_specs (new_exceptions, old_exceptions,
1091 error ("declaration of %qF throws different exceptions", new_decl);
1092 error ("from previous declaration %q+F", old_decl);
1096 #define GNU_INLINE_P(fn) (DECL_DECLARED_INLINE_P (fn) \
1097 && lookup_attribute ("gnu_inline", \
1098 DECL_ATTRIBUTES (fn)))
1100 /* If NEWDECL is a redeclaration of OLDDECL, merge the declarations.
1101 If the redeclaration is invalid, a diagnostic is issued, and the
1102 error_mark_node is returned. Otherwise, OLDDECL is returned.
1104 If NEWDECL is not a redeclaration of OLDDECL, NULL_TREE is
1107 NEWDECL_IS_FRIEND is true if NEWDECL was declared as a friend. */
1110 duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
1112 unsigned olddecl_uid = DECL_UID (olddecl);
1113 int olddecl_friend = 0, types_match = 0, hidden_friend = 0;
1114 int new_defines_function = 0;
1117 if (newdecl == olddecl)
1120 types_match = decls_match (newdecl, olddecl);
1122 /* If either the type of the new decl or the type of the old decl is an
1123 error_mark_node, then that implies that we have already issued an
1124 error (earlier) for some bogus type specification, and in that case,
1125 it is rather pointless to harass the user with yet more error message
1126 about the same declaration, so just pretend the types match here. */
1127 if (TREE_TYPE (newdecl) == error_mark_node
1128 || TREE_TYPE (olddecl) == error_mark_node)
1129 return error_mark_node;
1131 if (DECL_P (olddecl)
1132 && TREE_CODE (newdecl) == FUNCTION_DECL
1133 && TREE_CODE (olddecl) == FUNCTION_DECL
1134 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1136 if (DECL_DECLARED_INLINE_P (newdecl)
1137 && DECL_UNINLINABLE (newdecl)
1138 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1139 /* Already warned elsewhere. */;
1140 else if (DECL_DECLARED_INLINE_P (olddecl)
1141 && DECL_UNINLINABLE (olddecl)
1142 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1143 /* Already warned. */;
1144 else if (DECL_DECLARED_INLINE_P (newdecl)
1145 && DECL_UNINLINABLE (olddecl)
1146 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1148 warning (OPT_Wattributes, "function %q+D redeclared as inline",
1150 warning (OPT_Wattributes, "previous declaration of %q+D "
1151 "with attribute noinline", olddecl);
1153 else if (DECL_DECLARED_INLINE_P (olddecl)
1154 && DECL_UNINLINABLE (newdecl)
1155 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1157 warning (OPT_Wattributes, "function %q+D redeclared with "
1158 "attribute noinline", newdecl);
1159 warning (OPT_Wattributes, "previous declaration of %q+D was inline",
1164 /* Check for redeclaration and other discrepancies. */
1165 if (TREE_CODE (olddecl) == FUNCTION_DECL
1166 && DECL_ARTIFICIAL (olddecl))
1168 gcc_assert (!DECL_HIDDEN_FRIEND_P (olddecl));
1169 if (TREE_CODE (newdecl) != FUNCTION_DECL)
1171 /* Avoid warnings redeclaring built-ins which have not been
1172 explicitly declared. */
1173 if (DECL_ANTICIPATED (olddecl))
1176 /* If you declare a built-in or predefined function name as static,
1177 the old definition is overridden, but optionally warn this was a
1178 bad choice of name. */
1179 if (! TREE_PUBLIC (newdecl))
1181 warning (OPT_Wshadow, "shadowing %s function %q#D",
1182 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1184 /* Discard the old built-in function. */
1187 /* If the built-in is not ansi, then programs can override
1188 it even globally without an error. */
1189 else if (! DECL_BUILT_IN (olddecl))
1190 warning (0, "library function %q#D redeclared as non-function %q#D",
1194 error ("declaration of %q#D", newdecl);
1195 error ("conflicts with built-in declaration %q#D",
1200 else if (!types_match)
1202 /* Avoid warnings redeclaring built-ins which have not been
1203 explicitly declared. */
1204 if (DECL_ANTICIPATED (olddecl))
1206 /* Deal with fileptr_type_node. FILE type is not known
1207 at the time we create the builtins. */
1210 for (t1 = TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1211 t2 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1213 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
1216 else if (TREE_VALUE (t2) == fileptr_type_node)
1218 tree t = TREE_VALUE (t1);
1220 if (TREE_CODE (t) == POINTER_TYPE
1221 && TYPE_NAME (TREE_TYPE (t))
1222 && DECL_NAME (TYPE_NAME (TREE_TYPE (t)))
1223 == get_identifier ("FILE")
1224 && compparms (TREE_CHAIN (t1), TREE_CHAIN (t2)))
1226 tree oldargs = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1228 TYPE_ARG_TYPES (TREE_TYPE (olddecl))
1229 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1230 types_match = decls_match (newdecl, olddecl);
1232 return duplicate_decls (newdecl, olddecl,
1234 TYPE_ARG_TYPES (TREE_TYPE (olddecl)) = oldargs;
1237 else if (! same_type_p (TREE_VALUE (t1), TREE_VALUE (t2)))
1240 else if ((DECL_EXTERN_C_P (newdecl)
1241 && DECL_EXTERN_C_P (olddecl))
1242 || compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1243 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1245 /* A near match; override the builtin. */
1247 if (TREE_PUBLIC (newdecl))
1249 warning (0, "new declaration %q#D", newdecl);
1250 warning (0, "ambiguates built-in declaration %q#D",
1254 warning (OPT_Wshadow, "shadowing %s function %q#D",
1255 DECL_BUILT_IN (olddecl) ? "built-in" : "library",
1259 /* Discard the old built-in function. */
1262 /* Replace the old RTL to avoid problems with inlining. */
1263 COPY_DECL_RTL (newdecl, olddecl);
1265 /* Even if the types match, prefer the new declarations type for
1266 built-ins which have not been explicitly declared, for
1267 exception lists, etc... */
1268 else if (DECL_ANTICIPATED (olddecl))
1270 tree type = TREE_TYPE (newdecl);
1271 tree attribs = (*targetm.merge_type_attributes)
1272 (TREE_TYPE (olddecl), type);
1274 type = cp_build_type_attribute_variant (type, attribs);
1275 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = type;
1278 /* If a function is explicitly declared "throw ()", propagate that to
1279 the corresponding builtin. */
1280 if (DECL_BUILT_IN_CLASS (olddecl) == BUILT_IN_NORMAL
1281 && DECL_ANTICIPATED (olddecl)
1282 && TREE_NOTHROW (newdecl)
1283 && !TREE_NOTHROW (olddecl)
1284 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != NULL_TREE
1285 && built_in_decls [DECL_FUNCTION_CODE (olddecl)] != olddecl
1287 TREE_NOTHROW (built_in_decls [DECL_FUNCTION_CODE (olddecl)]) = 1;
1289 /* Whether or not the builtin can throw exceptions has no
1290 bearing on this declarator. */
1291 TREE_NOTHROW (olddecl) = 0;
1293 if (DECL_THIS_STATIC (newdecl) && !DECL_THIS_STATIC (olddecl))
1295 /* If a builtin function is redeclared as `static', merge
1296 the declarations, but make the original one static. */
1297 DECL_THIS_STATIC (olddecl) = 1;
1298 TREE_PUBLIC (olddecl) = 0;
1300 /* Make the old declaration consistent with the new one so
1301 that all remnants of the builtin-ness of this function
1302 will be banished. */
1303 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1304 COPY_DECL_RTL (newdecl, olddecl);
1307 else if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1309 /* C++ Standard, 3.3, clause 4:
1310 "[Note: a namespace name or a class template name must be unique
1311 in its declarative region (7.3.2, clause 14). ]" */
1312 if (TREE_CODE (olddecl) != NAMESPACE_DECL
1313 && TREE_CODE (newdecl) != NAMESPACE_DECL
1314 && (TREE_CODE (olddecl) != TEMPLATE_DECL
1315 || TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) != TYPE_DECL)
1316 && (TREE_CODE (newdecl) != TEMPLATE_DECL
1317 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != TYPE_DECL))
1319 if ((TREE_CODE (olddecl) == TYPE_DECL && DECL_ARTIFICIAL (olddecl)
1320 && TREE_CODE (newdecl) != TYPE_DECL)
1321 || (TREE_CODE (newdecl) == TYPE_DECL && DECL_ARTIFICIAL (newdecl)
1322 && TREE_CODE (olddecl) != TYPE_DECL))
1324 /* We do nothing special here, because C++ does such nasty
1325 things with TYPE_DECLs. Instead, just let the TYPE_DECL
1326 get shadowed, and know that if we need to find a TYPE_DECL
1327 for a given name, we can look in the IDENTIFIER_TYPE_VALUE
1328 slot of the identifier. */
1332 if ((TREE_CODE (newdecl) == FUNCTION_DECL
1333 && DECL_FUNCTION_TEMPLATE_P (olddecl))
1334 || (TREE_CODE (olddecl) == FUNCTION_DECL
1335 && DECL_FUNCTION_TEMPLATE_P (newdecl)))
1339 error ("%q#D redeclared as different kind of symbol", newdecl);
1340 if (TREE_CODE (olddecl) == TREE_LIST)
1341 olddecl = TREE_VALUE (olddecl);
1342 error ("previous declaration of %q+#D", olddecl);
1344 return error_mark_node;
1346 else if (!types_match)
1348 if (CP_DECL_CONTEXT (newdecl) != CP_DECL_CONTEXT (olddecl))
1349 /* These are certainly not duplicate declarations; they're
1350 from different scopes. */
1353 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1355 /* The name of a class template may not be declared to refer to
1356 any other template, class, function, object, namespace, value,
1357 or type in the same scope. */
1358 if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == TYPE_DECL
1359 || TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
1361 error ("declaration of template %q#D", newdecl);
1362 error ("conflicts with previous declaration %q+#D", olddecl);
1364 else if (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl)) == FUNCTION_DECL
1365 && TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == FUNCTION_DECL
1366 && compparms (TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (olddecl))),
1367 TYPE_ARG_TYPES (TREE_TYPE (DECL_TEMPLATE_RESULT (newdecl))))
1368 && comp_template_parms (DECL_TEMPLATE_PARMS (newdecl),
1369 DECL_TEMPLATE_PARMS (olddecl))
1370 /* Template functions can be disambiguated by
1372 && same_type_p (TREE_TYPE (TREE_TYPE (newdecl)),
1373 TREE_TYPE (TREE_TYPE (olddecl))))
1375 error ("new declaration %q#D", newdecl);
1376 error ("ambiguates old declaration %q+#D", olddecl);
1380 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1382 if (DECL_EXTERN_C_P (newdecl) && DECL_EXTERN_C_P (olddecl))
1384 error ("declaration of C function %q#D conflicts with",
1386 error ("previous declaration %q+#D here", olddecl);
1388 else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
1389 TYPE_ARG_TYPES (TREE_TYPE (olddecl))))
1391 error ("new declaration %q#D", newdecl);
1392 error ("ambiguates old declaration %q+#D", olddecl);
1393 return error_mark_node;
1400 error ("conflicting declaration %q#D", newdecl);
1401 error ("%q+D has a previous declaration as %q#D", olddecl, olddecl);
1402 return error_mark_node;
1405 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1406 && ((DECL_TEMPLATE_SPECIALIZATION (olddecl)
1407 && (!DECL_TEMPLATE_INFO (newdecl)
1408 || (DECL_TI_TEMPLATE (newdecl)
1409 != DECL_TI_TEMPLATE (olddecl))))
1410 || (DECL_TEMPLATE_SPECIALIZATION (newdecl)
1411 && (!DECL_TEMPLATE_INFO (olddecl)
1412 || (DECL_TI_TEMPLATE (olddecl)
1413 != DECL_TI_TEMPLATE (newdecl))))))
1414 /* It's OK to have a template specialization and a non-template
1415 with the same type, or to have specializations of two
1416 different templates with the same type. Note that if one is a
1417 specialization, and the other is an instantiation of the same
1418 template, that we do not exit at this point. That situation
1419 can occur if we instantiate a template class, and then
1420 specialize one of its methods. This situation is valid, but
1421 the declarations must be merged in the usual way. */
1423 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1424 && ((DECL_TEMPLATE_INSTANTIATION (olddecl)
1425 && !DECL_USE_TEMPLATE (newdecl))
1426 || (DECL_TEMPLATE_INSTANTIATION (newdecl)
1427 && !DECL_USE_TEMPLATE (olddecl))))
1428 /* One of the declarations is a template instantiation, and the
1429 other is not a template at all. That's OK. */
1431 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
1433 /* In [namespace.alias] we have:
1435 In a declarative region, a namespace-alias-definition can be
1436 used to redefine a namespace-alias declared in that declarative
1437 region to refer only to the namespace to which it already
1440 Therefore, if we encounter a second alias directive for the same
1441 alias, we can just ignore the second directive. */
1442 if (DECL_NAMESPACE_ALIAS (newdecl)
1443 && (DECL_NAMESPACE_ALIAS (newdecl)
1444 == DECL_NAMESPACE_ALIAS (olddecl)))
1446 /* [namespace.alias]
1448 A namespace-name or namespace-alias shall not be declared as
1449 the name of any other entity in the same declarative region.
1450 A namespace-name defined at global scope shall not be
1451 declared as the name of any other entity in any global scope
1453 error ("declaration of namespace %qD conflicts with", newdecl);
1454 error ("previous declaration of namespace %q+D here", olddecl);
1455 return error_mark_node;
1459 const char *errmsg = redeclaration_error_message (newdecl, olddecl);
1462 error_at (DECL_SOURCE_LOCATION (newdecl), errmsg, newdecl);
1463 if (DECL_NAME (olddecl) != NULL_TREE)
1464 error ((DECL_INITIAL (olddecl) && namespace_bindings_p ())
1465 ? "%q+#D previously defined here"
1466 : "%q+#D previously declared here", olddecl);
1467 return error_mark_node;
1469 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1470 && DECL_INITIAL (olddecl) != NULL_TREE
1471 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) == NULL_TREE
1472 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != NULL_TREE)
1474 /* Prototype decl follows defn w/o prototype. */
1475 warning (0, "prototype for %q+#D", newdecl);
1476 warning (0, "%Jfollows non-prototype definition here", olddecl);
1478 else if ((TREE_CODE (olddecl) == FUNCTION_DECL
1479 || TREE_CODE (olddecl) == VAR_DECL)
1480 && DECL_LANGUAGE (newdecl) != DECL_LANGUAGE (olddecl))
1483 If two declarations of the same function or object
1484 specify different linkage-specifications ..., the program
1485 is ill-formed.... Except for functions with C++ linkage,
1486 a function declaration without a linkage specification
1487 shall not precede the first linkage specification for
1488 that function. A function can be declared without a
1489 linkage specification after an explicit linkage
1490 specification has been seen; the linkage explicitly
1491 specified in the earlier declaration is not affected by
1492 such a function declaration.
1494 DR 563 raises the question why the restrictions on
1495 functions should not also apply to objects. Older
1496 versions of G++ silently ignore the linkage-specification
1504 which is clearly wrong. Therefore, we now treat objects
1506 if (current_lang_depth () == 0)
1508 /* There is no explicit linkage-specification, so we use
1509 the linkage from the previous declaration. */
1510 if (!DECL_LANG_SPECIFIC (newdecl))
1511 retrofit_lang_decl (newdecl);
1512 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1516 error ("previous declaration of %q+#D with %qL linkage",
1517 olddecl, DECL_LANGUAGE (olddecl));
1518 error ("conflicts with new declaration with %qL linkage",
1519 DECL_LANGUAGE (newdecl));
1523 if (DECL_LANG_SPECIFIC (olddecl) && DECL_USE_TEMPLATE (olddecl))
1525 else if (TREE_CODE (olddecl) == FUNCTION_DECL)
1527 tree t1 = TYPE_ARG_TYPES (TREE_TYPE (olddecl));
1528 tree t2 = TYPE_ARG_TYPES (TREE_TYPE (newdecl));
1531 if (TREE_CODE (TREE_TYPE (newdecl)) == METHOD_TYPE)
1532 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2);
1534 for (; t1 && t1 != void_list_node;
1535 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2), i++)
1536 if (TREE_PURPOSE (t1) && TREE_PURPOSE (t2))
1538 if (1 == simple_cst_equal (TREE_PURPOSE (t1),
1541 permerror (input_location, "default argument given for parameter %d of %q#D",
1543 permerror (input_location, "after previous specification in %q+#D", olddecl);
1547 error ("default argument given for parameter %d of %q#D",
1549 error ("after previous specification in %q+#D",
1556 /* Do not merge an implicit typedef with an explicit one. In:
1560 typedef class A A __attribute__ ((foo));
1562 the attribute should apply only to the typedef. */
1563 if (TREE_CODE (olddecl) == TYPE_DECL
1564 && (DECL_IMPLICIT_TYPEDEF_P (olddecl)
1565 || DECL_IMPLICIT_TYPEDEF_P (newdecl)))
1568 /* If new decl is `static' and an `extern' was seen previously,
1570 warn_extern_redeclared_static (newdecl, olddecl);
1572 /* We have committed to returning 1 at this point. */
1573 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1575 /* Now that functions must hold information normally held
1576 by field decls, there is extra work to do so that
1577 declaration information does not get destroyed during
1579 if (DECL_VINDEX (olddecl))
1580 DECL_VINDEX (newdecl) = DECL_VINDEX (olddecl);
1581 if (DECL_CONTEXT (olddecl))
1582 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1583 DECL_STATIC_CONSTRUCTOR (newdecl) |= DECL_STATIC_CONSTRUCTOR (olddecl);
1584 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1585 DECL_PURE_VIRTUAL_P (newdecl) |= DECL_PURE_VIRTUAL_P (olddecl);
1586 DECL_VIRTUAL_P (newdecl) |= DECL_VIRTUAL_P (olddecl);
1587 DECL_INVALID_OVERRIDER_P (newdecl) |= DECL_INVALID_OVERRIDER_P (olddecl);
1588 DECL_THIS_STATIC (newdecl) |= DECL_THIS_STATIC (olddecl);
1589 if (DECL_OVERLOADED_OPERATOR_P (olddecl) != ERROR_MARK)
1590 SET_OVERLOADED_OPERATOR_CODE
1591 (newdecl, DECL_OVERLOADED_OPERATOR_P (olddecl));
1592 new_defines_function = DECL_INITIAL (newdecl) != NULL_TREE;
1594 /* Optionally warn about more than one declaration for the same
1595 name, but don't warn about a function declaration followed by a
1597 if (warn_redundant_decls && ! DECL_ARTIFICIAL (olddecl)
1598 && !(new_defines_function && DECL_INITIAL (olddecl) == NULL_TREE)
1599 /* Don't warn about extern decl followed by definition. */
1600 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl))
1601 /* Don't warn about friends, let add_friend take care of it. */
1602 && ! (newdecl_is_friend || DECL_FRIEND_P (olddecl)))
1604 warning (OPT_Wredundant_decls, "redundant redeclaration of %qD in same scope", newdecl);
1605 warning (OPT_Wredundant_decls, "previous declaration of %q+D", olddecl);
1608 if (DECL_DELETED_FN (newdecl))
1610 error ("deleted definition of %qD", newdecl);
1611 error ("after previous declaration %q+D", olddecl);
1615 /* Deal with C++: must preserve virtual function table size. */
1616 if (TREE_CODE (olddecl) == TYPE_DECL)
1618 tree newtype = TREE_TYPE (newdecl);
1619 tree oldtype = TREE_TYPE (olddecl);
1621 if (newtype != error_mark_node && oldtype != error_mark_node
1622 && TYPE_LANG_SPECIFIC (newtype) && TYPE_LANG_SPECIFIC (oldtype))
1623 CLASSTYPE_FRIEND_CLASSES (newtype)
1624 = CLASSTYPE_FRIEND_CLASSES (oldtype);
1626 DECL_ORIGINAL_TYPE (newdecl) = DECL_ORIGINAL_TYPE (olddecl);
1629 /* Copy all the DECL_... slots specified in the new decl
1630 except for any that we copy here from the old type. */
1631 DECL_ATTRIBUTES (newdecl)
1632 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1634 if (TREE_CODE (newdecl) == TEMPLATE_DECL)
1638 old_result = DECL_TEMPLATE_RESULT (olddecl);
1639 new_result = DECL_TEMPLATE_RESULT (newdecl);
1640 TREE_TYPE (olddecl) = TREE_TYPE (old_result);
1641 DECL_TEMPLATE_SPECIALIZATIONS (olddecl)
1642 = chainon (DECL_TEMPLATE_SPECIALIZATIONS (olddecl),
1643 DECL_TEMPLATE_SPECIALIZATIONS (newdecl));
1645 DECL_ATTRIBUTES (old_result)
1646 = (*targetm.merge_decl_attributes) (old_result, new_result);
1648 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1650 if (GNU_INLINE_P (old_result) != GNU_INLINE_P (new_result)
1651 && DECL_INITIAL (new_result))
1653 if (DECL_INITIAL (old_result))
1654 DECL_UNINLINABLE (old_result) = 1;
1656 DECL_UNINLINABLE (old_result) = DECL_UNINLINABLE (new_result);
1657 DECL_EXTERNAL (old_result) = DECL_EXTERNAL (new_result);
1658 DECL_NOT_REALLY_EXTERN (old_result)
1659 = DECL_NOT_REALLY_EXTERN (new_result);
1660 DECL_INTERFACE_KNOWN (old_result)
1661 = DECL_INTERFACE_KNOWN (new_result);
1662 DECL_DECLARED_INLINE_P (old_result)
1663 = DECL_DECLARED_INLINE_P (new_result);
1664 DECL_DISREGARD_INLINE_LIMITS (old_result)
1665 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1670 DECL_DECLARED_INLINE_P (old_result)
1671 |= DECL_DECLARED_INLINE_P (new_result);
1672 DECL_DISREGARD_INLINE_LIMITS (old_result)
1673 |= DECL_DISREGARD_INLINE_LIMITS (new_result);
1674 check_redeclaration_exception_specification (newdecl, olddecl);
1678 /* If the new declaration is a definition, update the file and
1679 line information on the declaration, and also make
1680 the old declaration the same definition. */
1681 if (DECL_INITIAL (new_result) != NULL_TREE)
1683 DECL_SOURCE_LOCATION (olddecl)
1684 = DECL_SOURCE_LOCATION (old_result)
1685 = DECL_SOURCE_LOCATION (newdecl);
1686 DECL_INITIAL (old_result) = DECL_INITIAL (new_result);
1687 if (DECL_FUNCTION_TEMPLATE_P (newdecl))
1688 DECL_ARGUMENTS (old_result)
1689 = DECL_ARGUMENTS (new_result);
1697 /* Automatically handles default parameters. */
1698 tree oldtype = TREE_TYPE (olddecl);
1701 /* Merge the data types specified in the two decls. */
1702 newtype = merge_types (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1704 /* If merge_types produces a non-typedef type, just use the old type. */
1705 if (TREE_CODE (newdecl) == TYPE_DECL
1706 && newtype == DECL_ORIGINAL_TYPE (newdecl))
1709 if (TREE_CODE (newdecl) == VAR_DECL)
1711 DECL_THIS_EXTERN (newdecl) |= DECL_THIS_EXTERN (olddecl);
1712 DECL_INITIALIZED_P (newdecl) |= DECL_INITIALIZED_P (olddecl);
1713 DECL_NONTRIVIALLY_INITIALIZED_P (newdecl)
1714 |= DECL_NONTRIVIALLY_INITIALIZED_P (olddecl);
1715 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (newdecl)
1716 |= DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (olddecl);
1718 /* Merge the threadprivate attribute from OLDDECL into NEWDECL. */
1719 if (DECL_LANG_SPECIFIC (olddecl)
1720 && CP_DECL_THREADPRIVATE_P (olddecl))
1722 /* Allocate a LANG_SPECIFIC structure for NEWDECL, if needed. */
1723 if (!DECL_LANG_SPECIFIC (newdecl))
1724 retrofit_lang_decl (newdecl);
1726 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1727 CP_DECL_THREADPRIVATE_P (newdecl) = 1;
1731 /* Do this after calling `merge_types' so that default
1732 parameters don't confuse us. */
1733 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1734 check_redeclaration_exception_specification (newdecl, olddecl);
1735 TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
1737 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1738 check_default_args (newdecl);
1740 /* Lay the type out, unless already done. */
1741 if (! same_type_p (newtype, oldtype)
1742 && TREE_TYPE (newdecl) != error_mark_node
1743 && !(processing_template_decl && uses_template_parms (newdecl)))
1744 layout_type (TREE_TYPE (newdecl));
1746 if ((TREE_CODE (newdecl) == VAR_DECL
1747 || TREE_CODE (newdecl) == PARM_DECL
1748 || TREE_CODE (newdecl) == RESULT_DECL
1749 || TREE_CODE (newdecl) == FIELD_DECL
1750 || TREE_CODE (newdecl) == TYPE_DECL)
1751 && !(processing_template_decl && uses_template_parms (newdecl)))
1752 layout_decl (newdecl, 0);
1754 /* Merge the type qualifiers. */
1755 if (TREE_READONLY (newdecl))
1756 TREE_READONLY (olddecl) = 1;
1757 if (TREE_THIS_VOLATILE (newdecl))
1758 TREE_THIS_VOLATILE (olddecl) = 1;
1759 if (TREE_NOTHROW (newdecl))
1760 TREE_NOTHROW (olddecl) = 1;
1762 /* Merge deprecatedness. */
1763 if (TREE_DEPRECATED (newdecl))
1764 TREE_DEPRECATED (olddecl) = 1;
1766 /* Preserve function specific target and optimization options */
1767 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1769 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl)
1770 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl))
1771 DECL_FUNCTION_SPECIFIC_TARGET (newdecl)
1772 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl);
1774 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl)
1775 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl))
1776 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl)
1777 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl);
1780 /* Merge the initialization information. */
1781 if (DECL_INITIAL (newdecl) == NULL_TREE
1782 && DECL_INITIAL (olddecl) != NULL_TREE)
1784 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1785 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1786 if (CAN_HAVE_FULL_LANG_DECL_P (newdecl)
1787 && DECL_LANG_SPECIFIC (newdecl)
1788 && DECL_LANG_SPECIFIC (olddecl))
1790 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1791 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1795 /* Merge the section attribute.
1796 We want to issue an error if the sections conflict but that must be
1797 done later in decl_attributes since we are called before attributes
1799 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1800 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1802 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1804 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1805 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1806 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1807 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1808 TREE_NOTHROW (newdecl) |= TREE_NOTHROW (olddecl);
1809 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1810 DECL_IS_OPERATOR_NEW (newdecl) |= DECL_IS_OPERATOR_NEW (olddecl);
1811 DECL_PURE_P (newdecl) |= DECL_PURE_P (olddecl);
1812 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1813 DECL_LOOPING_CONST_OR_PURE_P (newdecl)
1814 |= DECL_LOOPING_CONST_OR_PURE_P (olddecl);
1815 /* Keep the old RTL. */
1816 COPY_DECL_RTL (olddecl, newdecl);
1818 else if (TREE_CODE (newdecl) == VAR_DECL
1819 && (DECL_SIZE (olddecl) || !DECL_SIZE (newdecl)))
1821 /* Keep the old RTL. We cannot keep the old RTL if the old
1822 declaration was for an incomplete object and the new
1823 declaration is not since many attributes of the RTL will
1825 COPY_DECL_RTL (olddecl, newdecl);
1828 /* If cannot merge, then use the new type and qualifiers,
1829 and don't preserve the old rtl. */
1832 /* Clean out any memory we had of the old declaration. */
1833 tree oldstatic = value_member (olddecl, static_aggregates);
1835 TREE_VALUE (oldstatic) = error_mark_node;
1837 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1838 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1839 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1840 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1843 /* Merge the storage class information. */
1844 merge_weak (newdecl, olddecl);
1846 DECL_ONE_ONLY (newdecl) |= DECL_ONE_ONLY (olddecl);
1847 DECL_DEFER_OUTPUT (newdecl) |= DECL_DEFER_OUTPUT (olddecl);
1848 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1849 TREE_STATIC (olddecl) = TREE_STATIC (newdecl) |= TREE_STATIC (olddecl);
1850 if (! DECL_EXTERNAL (olddecl))
1851 DECL_EXTERNAL (newdecl) = 0;
1853 new_template = NULL_TREE;
1854 if (DECL_LANG_SPECIFIC (newdecl) && DECL_LANG_SPECIFIC (olddecl))
1856 bool new_redefines_gnu_inline = false;
1858 if (new_defines_function
1859 && ((DECL_INTERFACE_KNOWN (olddecl)
1860 && TREE_CODE (olddecl) == FUNCTION_DECL)
1861 || (TREE_CODE (olddecl) == TEMPLATE_DECL
1862 && (TREE_CODE (DECL_TEMPLATE_RESULT (olddecl))
1863 == FUNCTION_DECL))))
1867 if (TREE_CODE (fn) == TEMPLATE_DECL)
1868 fn = DECL_TEMPLATE_RESULT (olddecl);
1870 new_redefines_gnu_inline = GNU_INLINE_P (fn) && DECL_INITIAL (fn);
1873 if (!new_redefines_gnu_inline)
1875 DECL_INTERFACE_KNOWN (newdecl) |= DECL_INTERFACE_KNOWN (olddecl);
1876 DECL_NOT_REALLY_EXTERN (newdecl) |= DECL_NOT_REALLY_EXTERN (olddecl);
1877 DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
1879 DECL_TEMPLATE_INSTANTIATED (newdecl)
1880 |= DECL_TEMPLATE_INSTANTIATED (olddecl);
1882 /* If the OLDDECL is an instantiation and/or specialization,
1883 then the NEWDECL must be too. But, it may not yet be marked
1884 as such if the caller has created NEWDECL, but has not yet
1885 figured out that it is a redeclaration. */
1886 if (!DECL_USE_TEMPLATE (newdecl))
1887 DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
1889 /* Don't really know how much of the language-specific
1890 values we should copy from old to new. */
1891 DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);
1892 DECL_LANG_SPECIFIC (newdecl)->decl_flags.u2 =
1893 DECL_LANG_SPECIFIC (olddecl)->decl_flags.u2;
1894 DECL_NONCONVERTING_P (newdecl) = DECL_NONCONVERTING_P (olddecl);
1895 DECL_REPO_AVAILABLE_P (newdecl) = DECL_REPO_AVAILABLE_P (olddecl);
1896 if (DECL_TEMPLATE_INFO (newdecl))
1897 new_template = DECL_TI_TEMPLATE (newdecl);
1898 DECL_TEMPLATE_INFO (newdecl) = DECL_TEMPLATE_INFO (olddecl);
1899 DECL_INITIALIZED_IN_CLASS_P (newdecl)
1900 |= DECL_INITIALIZED_IN_CLASS_P (olddecl);
1901 olddecl_friend = DECL_FRIEND_P (olddecl);
1902 hidden_friend = (DECL_ANTICIPATED (olddecl)
1903 && DECL_HIDDEN_FRIEND_P (olddecl)
1904 && newdecl_is_friend);
1906 /* Only functions have DECL_BEFRIENDING_CLASSES. */
1907 if (TREE_CODE (newdecl) == FUNCTION_DECL
1908 || DECL_FUNCTION_TEMPLATE_P (newdecl))
1910 DECL_BEFRIENDING_CLASSES (newdecl)
1911 = chainon (DECL_BEFRIENDING_CLASSES (newdecl),
1912 DECL_BEFRIENDING_CLASSES (olddecl));
1913 /* DECL_THUNKS is only valid for virtual functions,
1914 otherwise it is a DECL_FRIEND_CONTEXT. */
1915 if (DECL_VIRTUAL_P (newdecl))
1916 DECL_THUNKS (newdecl) = DECL_THUNKS (olddecl);
1920 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1922 if (DECL_TEMPLATE_INSTANTIATION (olddecl)
1923 && !DECL_TEMPLATE_INSTANTIATION (newdecl))
1925 /* If newdecl is not a specialization, then it is not a
1926 template-related function at all. And that means that we
1927 should have exited above, returning 0. */
1928 gcc_assert (DECL_TEMPLATE_SPECIALIZATION (newdecl));
1930 if (TREE_USED (olddecl))
1931 /* From [temp.expl.spec]:
1933 If a template, a member template or the member of a class
1934 template is explicitly specialized then that
1935 specialization shall be declared before the first use of
1936 that specialization that would cause an implicit
1937 instantiation to take place, in every translation unit in
1938 which such a use occurs. */
1939 error ("explicit specialization of %qD after first use",
1942 SET_DECL_TEMPLATE_SPECIALIZATION (olddecl);
1944 /* Don't propagate visibility from the template to the
1945 specialization here. We'll do that in determine_visibility if
1947 DECL_VISIBILITY_SPECIFIED (olddecl) = 0;
1949 /* [temp.expl.spec/14] We don't inline explicit specialization
1950 just because the primary template says so. */
1952 else if (new_defines_function && DECL_INITIAL (olddecl))
1954 /* Never inline re-defined extern inline functions.
1955 FIXME: this could be better handled by keeping both
1956 function as separate declarations. */
1957 DECL_UNINLINABLE (newdecl) = 1;
1961 if (DECL_PENDING_INLINE_INFO (newdecl) == 0)
1962 DECL_PENDING_INLINE_INFO (newdecl) = DECL_PENDING_INLINE_INFO (olddecl);
1964 DECL_DECLARED_INLINE_P (newdecl) |= DECL_DECLARED_INLINE_P (olddecl);
1966 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1967 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1969 DECL_DISREGARD_INLINE_LIMITS (newdecl)
1970 = DECL_DISREGARD_INLINE_LIMITS (olddecl)
1971 = (DECL_DISREGARD_INLINE_LIMITS (newdecl)
1972 || DECL_DISREGARD_INLINE_LIMITS (olddecl));
1975 /* Preserve abstractness on cloned [cd]tors. */
1976 DECL_ABSTRACT (newdecl) = DECL_ABSTRACT (olddecl);
1980 SET_DECL_LANGUAGE (olddecl, DECL_LANGUAGE (newdecl));
1981 COPY_DECL_ASSEMBLER_NAME (newdecl, olddecl);
1982 COPY_DECL_RTL (newdecl, olddecl);
1984 if (! types_match || new_defines_function)
1986 /* These need to be copied so that the names are available.
1987 Note that if the types do match, we'll preserve inline
1988 info and other bits, but if not, we won't. */
1989 DECL_ARGUMENTS (olddecl) = DECL_ARGUMENTS (newdecl);
1990 DECL_RESULT (olddecl) = DECL_RESULT (newdecl);
1992 if (new_defines_function)
1993 /* If defining a function declared with other language
1994 linkage, use the previously declared language linkage. */
1995 SET_DECL_LANGUAGE (newdecl, DECL_LANGUAGE (olddecl));
1996 else if (types_match)
1998 /* If redeclaring a builtin function, and not a definition,
1999 it stays built in. */
2000 if (DECL_BUILT_IN (olddecl))
2002 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2003 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2004 /* If we're keeping the built-in definition, keep the rtl,
2005 regardless of declaration matches. */
2006 COPY_DECL_RTL (olddecl, newdecl);
2009 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2010 /* Don't clear out the arguments if we're redefining a function. */
2011 if (DECL_ARGUMENTS (olddecl))
2012 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2015 else if (TREE_CODE (newdecl) == NAMESPACE_DECL)
2016 NAMESPACE_LEVEL (newdecl) = NAMESPACE_LEVEL (olddecl);
2018 /* Now preserve various other info from the definition. */
2019 TREE_ADDRESSABLE (newdecl) = TREE_ADDRESSABLE (olddecl);
2020 TREE_ASM_WRITTEN (newdecl) = TREE_ASM_WRITTEN (olddecl);
2021 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
2022 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
2024 /* Warn about conflicting visibility specifications. */
2025 if (DECL_VISIBILITY_SPECIFIED (olddecl)
2026 && DECL_VISIBILITY_SPECIFIED (newdecl)
2027 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
2029 warning (OPT_Wattributes, "%q+D: visibility attribute ignored "
2030 "because it", newdecl);
2031 warning (OPT_Wattributes, "%Jconflicts with previous "
2032 "declaration here", olddecl);
2034 /* Choose the declaration which specified visibility. */
2035 if (DECL_VISIBILITY_SPECIFIED (olddecl))
2037 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
2038 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
2040 /* Init priority used to be merged from newdecl to olddecl by the memcpy,
2041 so keep this behavior. */
2042 if (TREE_CODE (newdecl) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (newdecl))
2044 SET_DECL_INIT_PRIORITY (olddecl, DECL_INIT_PRIORITY (newdecl));
2045 DECL_HAS_INIT_PRIORITY_P (olddecl) = 1;
2048 /* The DECL_LANG_SPECIFIC information in OLDDECL will be replaced
2049 with that from NEWDECL below. */
2050 if (DECL_LANG_SPECIFIC (olddecl))
2052 gcc_assert (DECL_LANG_SPECIFIC (olddecl)
2053 != DECL_LANG_SPECIFIC (newdecl));
2054 ggc_free (DECL_LANG_SPECIFIC (olddecl));
2057 /* Merge the USED information. */
2058 if (TREE_USED (olddecl))
2059 TREE_USED (newdecl) = 1;
2060 else if (TREE_USED (newdecl))
2061 TREE_USED (olddecl) = 1;
2063 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2067 function_size = sizeof (struct tree_decl_common);
2069 memcpy ((char *) olddecl + sizeof (struct tree_common),
2070 (char *) newdecl + sizeof (struct tree_common),
2071 function_size - sizeof (struct tree_common));
2073 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2074 (char *) newdecl + sizeof (struct tree_decl_common),
2075 sizeof (struct tree_function_decl) - sizeof (struct tree_decl_common));
2077 /* If newdecl is a template instantiation, it is possible that
2078 the following sequence of events has occurred:
2080 o A friend function was declared in a class template. The
2081 class template was instantiated.
2083 o The instantiation of the friend declaration was
2084 recorded on the instantiation list, and is newdecl.
2086 o Later, however, instantiate_class_template called pushdecl
2087 on the newdecl to perform name injection. But, pushdecl in
2088 turn called duplicate_decls when it discovered that another
2089 declaration of a global function with the same name already
2092 o Here, in duplicate_decls, we decided to clobber newdecl.
2094 If we're going to do that, we'd better make sure that
2095 olddecl, and not newdecl, is on the list of
2096 instantiations so that if we try to do the instantiation
2097 again we won't get the clobbered declaration. */
2098 reregister_specialization (newdecl,
2104 size_t size = tree_code_size (TREE_CODE (olddecl));
2105 memcpy ((char *) olddecl + sizeof (struct tree_common),
2106 (char *) newdecl + sizeof (struct tree_common),
2107 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
2108 switch (TREE_CODE (olddecl))
2118 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2119 (char *) newdecl + sizeof (struct tree_decl_common),
2120 size - sizeof (struct tree_decl_common)
2121 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2125 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
2126 (char *) newdecl + sizeof (struct tree_decl_common),
2127 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)
2128 + TREE_CODE_LENGTH (TREE_CODE (newdecl)) * sizeof (char *));
2132 DECL_UID (olddecl) = olddecl_uid;
2134 DECL_FRIEND_P (olddecl) = 1;
2137 DECL_ANTICIPATED (olddecl) = 1;
2138 DECL_HIDDEN_FRIEND_P (olddecl) = 1;
2141 /* NEWDECL contains the merged attribute lists.
2142 Update OLDDECL to be the same. */
2143 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2145 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2146 so that encode_section_info has a chance to look at the new decl
2147 flags and attributes. */
2148 if (DECL_RTL_SET_P (olddecl)
2149 && (TREE_CODE (olddecl) == FUNCTION_DECL
2150 || (TREE_CODE (olddecl) == VAR_DECL
2151 && TREE_STATIC (olddecl))))
2152 make_decl_rtl (olddecl);
2154 /* The NEWDECL will no longer be needed. Because every out-of-class
2155 declaration of a member results in a call to duplicate_decls,
2156 freeing these nodes represents in a significant savings. */
2162 /* Return zero if the declaration NEWDECL is valid
2163 when the declaration OLDDECL (assumed to be for the same name)
2164 has already been seen.
2165 Otherwise return an error message format string with a %s
2166 where the identifier should go. */
2169 redeclaration_error_message (tree newdecl, tree olddecl)
2171 if (TREE_CODE (newdecl) == TYPE_DECL)
2173 /* Because C++ can put things into name space for free,
2174 constructs like "typedef struct foo { ... } foo"
2175 would look like an erroneous redeclaration. */
2176 if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
2179 return "redefinition of %q#D";
2181 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2183 /* If this is a pure function, its olddecl will actually be
2184 the original initialization to `0' (which we force to call
2185 abort()). Don't complain about redefinition in this case. */
2186 if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
2187 && DECL_INITIAL (olddecl) == NULL_TREE)
2190 /* If both functions come from different namespaces, this is not
2191 a redeclaration - this is a conflict with a used function. */
2192 if (DECL_NAMESPACE_SCOPE_P (olddecl)
2193 && DECL_CONTEXT (olddecl) != DECL_CONTEXT (newdecl)
2194 && ! decls_match (olddecl, newdecl))
2195 return "%qD conflicts with used function";
2197 /* We'll complain about linkage mismatches in
2198 warn_extern_redeclared_static. */
2200 /* Defining the same name twice is no good. */
2201 if (DECL_INITIAL (olddecl) != NULL_TREE
2202 && DECL_INITIAL (newdecl) != NULL_TREE)
2204 if (DECL_NAME (olddecl) == NULL_TREE)
2205 return "%q#D not declared in class";
2206 else if (!GNU_INLINE_P (olddecl)
2207 || GNU_INLINE_P (newdecl))
2208 return "redefinition of %q#D";
2211 if (DECL_DECLARED_INLINE_P (olddecl) && DECL_DECLARED_INLINE_P (newdecl))
2213 bool olda = GNU_INLINE_P (olddecl);
2214 bool newa = GNU_INLINE_P (newdecl);
2219 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2221 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2227 else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
2231 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) == TYPE_DECL)
2233 if (COMPLETE_TYPE_P (TREE_TYPE (newdecl))
2234 && COMPLETE_TYPE_P (TREE_TYPE (olddecl)))
2235 return "redefinition of %q#D";
2239 if (TREE_CODE (DECL_TEMPLATE_RESULT (newdecl)) != FUNCTION_DECL
2240 || (DECL_TEMPLATE_RESULT (newdecl)
2241 == DECL_TEMPLATE_RESULT (olddecl)))
2244 nt = DECL_TEMPLATE_RESULT (newdecl);
2245 if (DECL_TEMPLATE_INFO (nt))
2246 nt = DECL_TEMPLATE_RESULT (template_for_substitution (nt));
2247 ot = DECL_TEMPLATE_RESULT (olddecl);
2248 if (DECL_TEMPLATE_INFO (ot))
2249 ot = DECL_TEMPLATE_RESULT (template_for_substitution (ot));
2250 if (DECL_INITIAL (nt) && DECL_INITIAL (ot)
2251 && (!GNU_INLINE_P (ot) || GNU_INLINE_P (nt)))
2252 return "redefinition of %q#D";
2254 if (DECL_DECLARED_INLINE_P (ot) && DECL_DECLARED_INLINE_P (nt))
2256 bool olda = GNU_INLINE_P (ot);
2257 bool newa = GNU_INLINE_P (nt);
2262 return "%q+D redeclared inline with %<gnu_inline%> attribute";
2264 return "%q+D redeclared inline without %<gnu_inline%> attribute";
2268 /* Core issue #226 (C++0x):
2270 If a friend function template declaration specifies a
2271 default template-argument, that declaration shall be a
2272 definition and shall be the only declaration of the
2273 function template in the translation unit. */
2274 if ((cxx_dialect != cxx98)
2275 && TREE_CODE (ot) == FUNCTION_DECL && DECL_FRIEND_P (ot)
2276 && !check_default_tmpl_args (nt, DECL_TEMPLATE_PARMS (newdecl),
2277 /*is_primary=*/1, /*is_partial=*/0,
2278 /*is_friend_decl=*/2))
2279 return "redeclaration of friend %q#D may not have default template arguments";
2283 else if (TREE_CODE (newdecl) == VAR_DECL
2284 && DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)
2285 && (! DECL_LANG_SPECIFIC (olddecl)
2286 || ! CP_DECL_THREADPRIVATE_P (olddecl)
2287 || DECL_THREAD_LOCAL_P (newdecl)))
2289 /* Only variables can be thread-local, and all declarations must
2290 agree on this property. */
2291 if (DECL_THREAD_LOCAL_P (newdecl))
2292 return "thread-local declaration of %q#D follows "
2293 "non-thread-local declaration";
2295 return "non-thread-local declaration of %q#D follows "
2296 "thread-local declaration";
2298 else if (toplevel_bindings_p () || DECL_NAMESPACE_SCOPE_P (newdecl))
2300 /* The objects have been declared at namespace scope. If either
2301 is a member of an anonymous union, then this is an invalid
2302 redeclaration. For example:
2308 if ((TREE_CODE (newdecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (newdecl))
2309 || (TREE_CODE (olddecl) == VAR_DECL && DECL_ANON_UNION_VAR_P (olddecl)))
2310 return "redeclaration of %q#D";
2311 /* If at least one declaration is a reference, there is no
2312 conflict. For example:
2318 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2320 /* Reject two definitions. */
2321 return "redefinition of %q#D";
2325 /* Objects declared with block scope: */
2326 /* Reject two definitions, and reject a definition
2327 together with an external reference. */
2328 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2329 return "redeclaration of %q#D";
2334 /* Hash and equality functions for the named_label table. */
2337 named_label_entry_hash (const void *data)
2339 const struct named_label_entry *ent = (const struct named_label_entry *) data;
2340 return DECL_UID (ent->label_decl);
2344 named_label_entry_eq (const void *a, const void *b)
2346 const struct named_label_entry *ent_a = (const struct named_label_entry *) a;
2347 const struct named_label_entry *ent_b = (const struct named_label_entry *) b;
2348 return ent_a->label_decl == ent_b->label_decl;
2351 /* Create a new label, named ID. */
2354 make_label_decl (tree id, int local_p)
2356 struct named_label_entry *ent;
2360 decl = build_decl (LABEL_DECL, id, void_type_node);
2362 DECL_CONTEXT (decl) = current_function_decl;
2363 DECL_MODE (decl) = VOIDmode;
2364 C_DECLARED_LABEL_FLAG (decl) = local_p;
2366 /* Say where one reference is to the label, for the sake of the
2367 error if it is not defined. */
2368 DECL_SOURCE_LOCATION (decl) = input_location;
2370 /* Record the fact that this identifier is bound to this label. */
2371 SET_IDENTIFIER_LABEL_VALUE (id, decl);
2373 /* Create the label htab for the function on demand. */
2375 named_labels = htab_create_ggc (13, named_label_entry_hash,
2376 named_label_entry_eq, NULL);
2378 /* Record this label on the list of labels used in this function.
2379 We do this before calling make_label_decl so that we get the
2380 IDENTIFIER_LABEL_VALUE before the new label is declared. */
2381 ent = GGC_CNEW (struct named_label_entry);
2382 ent->label_decl = decl;
2384 slot = htab_find_slot (named_labels, ent, INSERT);
2385 gcc_assert (*slot == NULL);
2391 /* Look for a label named ID in the current function. If one cannot
2392 be found, create one. (We keep track of used, but undefined,
2393 labels, and complain about them at the end of a function.) */
2396 lookup_label (tree id)
2400 timevar_push (TV_NAME_LOOKUP);
2401 /* You can't use labels at global scope. */
2402 if (current_function_decl == NULL_TREE)
2404 error ("label %qE referenced outside of any function", id);
2405 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, NULL_TREE);
2408 /* See if we've already got this label. */
2409 decl = IDENTIFIER_LABEL_VALUE (id);
2410 if (decl != NULL_TREE && DECL_CONTEXT (decl) == current_function_decl)
2411 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2413 decl = make_label_decl (id, /*local_p=*/0);
2414 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2417 /* Declare a local label named ID. */
2420 declare_local_label (tree id)
2424 /* Add a new entry to the SHADOWED_LABELS list so that when we leave
2425 this scope we can restore the old value of IDENTIFIER_TYPE_VALUE. */
2426 shadow = tree_cons (IDENTIFIER_LABEL_VALUE (id), NULL_TREE,
2427 current_binding_level->shadowed_labels);
2428 current_binding_level->shadowed_labels = shadow;
2430 decl = make_label_decl (id, /*local_p=*/1);
2431 TREE_VALUE (shadow) = decl;
2436 /* Returns nonzero if it is ill-formed to jump past the declaration of
2437 DECL. Returns 2 if it's also a real problem. */
2440 decl_jump_unsafe (tree decl)
2442 if (TREE_CODE (decl) != VAR_DECL || TREE_STATIC (decl)
2443 || TREE_TYPE (decl) == error_mark_node)
2446 if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
2447 || DECL_NONTRIVIALLY_INITIALIZED_P (decl))
2450 if (pod_type_p (TREE_TYPE (decl)))
2453 /* The POD stuff is just pedantry; why should it matter if the class
2454 contains a field of pointer to member type? */
2458 /* A subroutine of check_previous_goto_1 to identify a branch to the user. */
2461 identify_goto (tree decl, const location_t *locus)
2464 permerror (input_location, "jump to label %qD", decl);
2466 permerror (input_location, "jump to case label");
2468 permerror (input_location, "%H from here", locus);
2471 /* Check that a single previously seen jump to a newly defined label
2472 is OK. DECL is the LABEL_DECL or 0; LEVEL is the binding_level for
2473 the jump context; NAMES are the names in scope in LEVEL at the jump
2474 context; LOCUS is the source position of the jump or 0. Returns
2475 true if all is well. */
2478 check_previous_goto_1 (tree decl, struct cp_binding_level* level, tree names,
2479 bool exited_omp, const location_t *locus)
2481 struct cp_binding_level *b;
2482 bool identified = false, saw_eh = false, saw_omp = false;
2486 identify_goto (decl, locus);
2487 error (" exits OpenMP structured block");
2488 identified = saw_omp = true;
2491 for (b = current_binding_level; b ; b = b->level_chain)
2493 tree new_decls, old_decls = (b == level ? names : NULL_TREE);
2495 for (new_decls = b->names; new_decls != old_decls;
2496 new_decls = TREE_CHAIN (new_decls))
2498 int problem = decl_jump_unsafe (new_decls);
2504 identify_goto (decl, locus);
2508 error (" crosses initialization of %q+#D", new_decls);
2510 permerror (input_location, " enters scope of non-POD %q+#D", new_decls);
2515 if ((b->kind == sk_try || b->kind == sk_catch) && !saw_eh)
2519 identify_goto (decl, locus);
2522 if (b->kind == sk_try)
2523 error (" enters try block");
2525 error (" enters catch block");
2528 if (b->kind == sk_omp && !saw_omp)
2532 identify_goto (decl, locus);
2535 error (" enters OpenMP structured block");
2544 check_previous_goto (tree decl, struct named_label_use_entry *use)
2546 check_previous_goto_1 (decl, use->binding_level,
2547 use->names_in_scope, use->in_omp_scope,
2548 &use->o_goto_locus);
2552 check_switch_goto (struct cp_binding_level* level)
2554 return check_previous_goto_1 (NULL_TREE, level, level->names, false, NULL);
2557 /* Check that a new jump to a label DECL is OK. Called by
2558 finish_goto_stmt. */
2561 check_goto (tree decl)
2563 struct named_label_entry *ent, dummy;
2564 bool saw_catch = false, identified = false;
2567 /* We can't know where a computed goto is jumping.
2568 So we assume that it's OK. */
2569 if (TREE_CODE (decl) != LABEL_DECL)
2572 /* We didn't record any information about this label when we created it,
2573 and there's not much point since it's trivial to analyze as a return. */
2574 if (decl == cdtor_label)
2577 dummy.label_decl = decl;
2578 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2579 gcc_assert (ent != NULL);
2581 /* If the label hasn't been defined yet, defer checking. */
2582 if (! DECL_INITIAL (decl))
2584 struct named_label_use_entry *new_use;
2586 /* Don't bother creating another use if the last goto had the
2587 same data, and will therefore create the same set of errors. */
2589 && ent->uses->names_in_scope == current_binding_level->names)
2592 new_use = GGC_NEW (struct named_label_use_entry);
2593 new_use->binding_level = current_binding_level;
2594 new_use->names_in_scope = current_binding_level->names;
2595 new_use->o_goto_locus = input_location;
2596 new_use->in_omp_scope = false;
2598 new_use->next = ent->uses;
2599 ent->uses = new_use;
2603 if (ent->in_try_scope || ent->in_catch_scope
2604 || ent->in_omp_scope || ent->bad_decls)
2606 permerror (input_location, "jump to label %q+D", decl);
2607 permerror (input_location, " from here");
2611 for (bad = ent->bad_decls; bad; bad = TREE_CHAIN (bad))
2613 tree b = TREE_VALUE (bad);
2614 int u = decl_jump_unsafe (b);
2616 if (u > 1 && DECL_ARTIFICIAL (b))
2618 /* Can't skip init of __exception_info. */
2619 error ("%J enters catch block", b);
2623 error (" skips initialization of %q+#D", b);
2625 permerror (input_location, " enters scope of non-POD %q+#D", b);
2628 if (ent->in_try_scope)
2629 error (" enters try block");
2630 else if (ent->in_catch_scope && !saw_catch)
2631 error (" enters catch block");
2633 if (ent->in_omp_scope)
2634 error (" enters OpenMP structured block");
2635 else if (flag_openmp)
2637 struct cp_binding_level *b;
2638 for (b = current_binding_level; b ; b = b->level_chain)
2640 if (b == ent->binding_level)
2642 if (b->kind == sk_omp)
2646 permerror (input_location, "jump to label %q+D", decl);
2647 permerror (input_location, " from here");
2650 error (" exits OpenMP structured block");
2657 /* Check that a return is ok wrt OpenMP structured blocks.
2658 Called by finish_return_stmt. Returns true if all is well. */
2661 check_omp_return (void)
2663 struct cp_binding_level *b;
2664 for (b = current_binding_level; b ; b = b->level_chain)
2665 if (b->kind == sk_omp)
2667 error ("invalid exit from OpenMP structured block");
2673 /* Define a label, specifying the location in the source file.
2674 Return the LABEL_DECL node for the label. */
2677 define_label (location_t location, tree name)
2679 struct named_label_entry *ent, dummy;
2680 struct cp_binding_level *p;
2683 timevar_push (TV_NAME_LOOKUP);
2685 decl = lookup_label (name);
2687 dummy.label_decl = decl;
2688 ent = (struct named_label_entry *) htab_find (named_labels, &dummy);
2689 gcc_assert (ent != NULL);
2691 /* After labels, make any new cleanups in the function go into their
2692 own new (temporary) binding contour. */
2693 for (p = current_binding_level;
2694 p->kind != sk_function_parms;
2696 p->more_cleanups_ok = 0;
2698 if (name == get_identifier ("wchar_t"))
2699 permerror (input_location, "label named wchar_t");
2701 if (DECL_INITIAL (decl) != NULL_TREE)
2703 error ("duplicate label %qD", decl);
2704 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
2708 struct named_label_use_entry *use;
2710 /* Mark label as having been defined. */
2711 DECL_INITIAL (decl) = error_mark_node;
2712 /* Say where in the source. */
2713 DECL_SOURCE_LOCATION (decl) = location;
2715 ent->binding_level = current_binding_level;
2716 ent->names_in_scope = current_binding_level->names;
2718 for (use = ent->uses; use ; use = use->next)
2719 check_previous_goto (decl, use);
2723 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, decl);
2728 struct cp_binding_level *level;
2729 struct cp_switch *next;
2730 /* The SWITCH_STMT being built. */
2732 /* A splay-tree mapping the low element of a case range to the high
2733 element, or NULL_TREE if there is no high element. Used to
2734 determine whether or not a new case label duplicates an old case
2735 label. We need a tree, rather than simply a hash table, because
2736 of the GNU case range extension. */
2740 /* A stack of the currently active switch statements. The innermost
2741 switch statement is on the top of the stack. There is no need to
2742 mark the stack for garbage collection because it is only active
2743 during the processing of the body of a function, and we never
2744 collect at that point. */
2746 static struct cp_switch *switch_stack;
2748 /* Called right after a switch-statement condition is parsed.
2749 SWITCH_STMT is the switch statement being parsed. */
2752 push_switch (tree switch_stmt)
2754 struct cp_switch *p = XNEW (struct cp_switch);
2755 p->level = current_binding_level;
2756 p->next = switch_stack;
2757 p->switch_stmt = switch_stmt;
2758 p->cases = splay_tree_new (case_compare, NULL, NULL);
2765 struct cp_switch *cs = switch_stack;
2766 location_t switch_location;
2768 /* Emit warnings as needed. */
2769 if (EXPR_HAS_LOCATION (cs->switch_stmt))
2770 switch_location = EXPR_LOCATION (cs->switch_stmt);
2772 switch_location = input_location;
2773 if (!processing_template_decl)
2774 c_do_switch_warnings (cs->cases, switch_location,
2775 SWITCH_STMT_TYPE (cs->switch_stmt),
2776 SWITCH_STMT_COND (cs->switch_stmt));
2778 splay_tree_delete (cs->cases);
2779 switch_stack = switch_stack->next;
2783 /* Note that we've seen a definition of a case label, and complain if this
2784 is a bad place for one. */
2787 finish_case_label (tree low_value, tree high_value)
2790 struct cp_binding_level *p;
2792 if (processing_template_decl)
2796 /* For templates, just add the case label; we'll do semantic
2797 analysis at instantiation-time. */
2798 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2799 return add_stmt (build_case_label (low_value, high_value, label));
2802 /* Find the condition on which this switch statement depends. */
2803 cond = SWITCH_STMT_COND (switch_stack->switch_stmt);
2804 if (cond && TREE_CODE (cond) == TREE_LIST)
2805 cond = TREE_VALUE (cond);
2807 if (!check_switch_goto (switch_stack->level))
2808 return error_mark_node;
2810 r = c_add_case_label (switch_stack->cases, cond, TREE_TYPE (cond),
2811 low_value, high_value);
2813 /* After labels, make any new cleanups in the function go into their
2814 own new (temporary) binding contour. */
2815 for (p = current_binding_level;
2816 p->kind != sk_function_parms;
2818 p->more_cleanups_ok = 0;
2823 /* Hash a TYPENAME_TYPE. K is really of type `tree'. */
2826 typename_hash (const void* k)
2829 const_tree const t = (const_tree) k;
2831 hash = (htab_hash_pointer (TYPE_CONTEXT (t))
2832 ^ htab_hash_pointer (DECL_NAME (TYPE_NAME (t))));
2837 typedef struct typename_info {
2845 /* Compare two TYPENAME_TYPEs. K1 is really of type `tree', K2 is
2846 really of type `typename_info*' */
2849 typename_compare (const void * k1, const void * k2)
2851 const_tree const t1 = (const_tree) k1;
2852 const typename_info *const t2 = (const typename_info *) k2;
2854 return (DECL_NAME (TYPE_NAME (t1)) == t2->name
2855 && TYPE_CONTEXT (t1) == t2->scope
2856 && TYPENAME_TYPE_FULLNAME (t1) == t2->template_id
2857 && TYPENAME_IS_ENUM_P (t1) == t2->enum_p
2858 && TYPENAME_IS_CLASS_P (t1) == t2->class_p);
2861 /* Build a TYPENAME_TYPE. If the type is `typename T::t', CONTEXT is
2862 the type of `T', NAME is the IDENTIFIER_NODE for `t'.
2864 Returns the new TYPENAME_TYPE. */
2866 static GTY ((param_is (union tree_node))) htab_t typename_htab;
2869 build_typename_type (tree context, tree name, tree fullname,
2870 enum tag_types tag_type)
2878 if (typename_htab == NULL)
2879 typename_htab = htab_create_ggc (61, &typename_hash,
2880 &typename_compare, NULL);
2882 ti.scope = FROB_CONTEXT (context);
2884 ti.template_id = fullname;
2885 ti.enum_p = tag_type == enum_type;
2886 ti.class_p = (tag_type == class_type
2887 || tag_type == record_type
2888 || tag_type == union_type);
2889 hash = (htab_hash_pointer (ti.scope)
2890 ^ htab_hash_pointer (ti.name));
2892 /* See if we already have this type. */
2893 e = htab_find_slot_with_hash (typename_htab, &ti, hash, INSERT);
2898 /* Build the TYPENAME_TYPE. */
2899 t = cxx_make_type (TYPENAME_TYPE);
2900 TYPE_CONTEXT (t) = ti.scope;
2901 TYPENAME_TYPE_FULLNAME (t) = ti.template_id;
2902 TYPENAME_IS_ENUM_P (t) = ti.enum_p;
2903 TYPENAME_IS_CLASS_P (t) = ti.class_p;
2905 /* Build the corresponding TYPE_DECL. */
2906 d = build_decl (TYPE_DECL, name, t);
2907 TYPE_NAME (TREE_TYPE (d)) = d;
2908 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
2909 DECL_CONTEXT (d) = FROB_CONTEXT (context);
2910 DECL_ARTIFICIAL (d) = 1;
2912 /* Store it in the hash table. */
2915 /* TYPENAME_TYPEs must always be compared structurally, because
2916 they may or may not resolve down to another type depending on
2917 the currently open classes. */
2918 SET_TYPE_STRUCTURAL_EQUALITY (t);
2924 /* Resolve `typename CONTEXT::NAME'. TAG_TYPE indicates the tag
2925 provided to name the type. Returns an appropriate type, unless an
2926 error occurs, in which case error_mark_node is returned. If we
2927 locate a non-artificial TYPE_DECL and TF_KEEP_TYPE_DECL is set, we
2928 return that, rather than the _TYPE it corresponds to, in other
2929 cases we look through the type decl. If TF_ERROR is set, complain
2930 about errors, otherwise be quiet. */
2933 make_typename_type (tree context, tree name, enum tag_types tag_type,
2934 tsubst_flags_t complain)
2940 if (name == error_mark_node
2941 || context == NULL_TREE
2942 || context == error_mark_node)
2943 return error_mark_node;
2947 if (!(TYPE_LANG_SPECIFIC (name)
2948 && (CLASSTYPE_IS_TEMPLATE (name)
2949 || CLASSTYPE_USE_TEMPLATE (name))))
2950 name = TYPE_IDENTIFIER (name);
2952 /* Create a TEMPLATE_ID_EXPR for the type. */
2953 name = build_nt (TEMPLATE_ID_EXPR,
2954 CLASSTYPE_TI_TEMPLATE (name),
2955 CLASSTYPE_TI_ARGS (name));
2957 else if (TREE_CODE (name) == TYPE_DECL)
2958 name = DECL_NAME (name);
2962 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
2964 name = TREE_OPERAND (name, 0);
2965 if (TREE_CODE (name) == TEMPLATE_DECL)
2966 name = TREE_OPERAND (fullname, 0) = DECL_NAME (name);
2967 else if (TREE_CODE (name) == OVERLOAD)
2969 error ("%qD is not a type", name);
2970 return error_mark_node;
2973 if (TREE_CODE (name) == TEMPLATE_DECL)
2975 error ("%qD used without template parameters", name);
2976 return error_mark_node;
2978 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
2979 gcc_assert (TYPE_P (context));
2981 /* When the CONTEXT is a dependent type, NAME could refer to a
2982 dependent base class of CONTEXT. So we cannot peek inside it,
2983 even if CONTEXT is a currently open scope. */
2984 if (dependent_type_p (context))
2985 return build_typename_type (context, name, fullname, tag_type);
2987 if (!MAYBE_CLASS_TYPE_P (context))
2989 if (complain & tf_error)
2990 error ("%q#T is not a class", context);
2991 return error_mark_node;
2994 want_template = TREE_CODE (fullname) == TEMPLATE_ID_EXPR;
2996 /* We should only set WANT_TYPE when we're a nested typename type.
2997 Then we can give better diagnostics if we find a non-type. */
2998 t = lookup_field (context, name, 0, /*want_type=*/true);
3001 if (complain & tf_error)
3002 error (want_template ? "no class template named %q#T in %q#T"
3003 : "no type named %q#T in %q#T", name, context);
3004 return error_mark_node;
3007 if (want_template && !DECL_CLASS_TEMPLATE_P (t))
3009 if (complain & tf_error)
3010 error ("%<typename %T::%D%> names %q#T, which is not a class template",
3012 return error_mark_node;
3014 if (!want_template && TREE_CODE (t) != TYPE_DECL)
3016 if (complain & tf_error)
3017 error ("%<typename %T::%D%> names %q#T, which is not a type",
3019 return error_mark_node;
3022 if (complain & tf_error)
3023 perform_or_defer_access_check (TYPE_BINFO (context), t, t);
3026 return lookup_template_class (t, TREE_OPERAND (fullname, 1),
3028 /*entering_scope=*/0,
3029 tf_warning_or_error | tf_user);
3031 if (DECL_ARTIFICIAL (t) || !(complain & tf_keep_type_decl))
3037 /* Resolve `CONTEXT::template NAME'. Returns a TEMPLATE_DECL if the name
3038 can be resolved or an UNBOUND_CLASS_TEMPLATE, unless an error occurs,
3039 in which case error_mark_node is returned.
3041 If PARM_LIST is non-NULL, also make sure that the template parameter
3042 list of TEMPLATE_DECL matches.
3044 If COMPLAIN zero, don't complain about any errors that occur. */
3047 make_unbound_class_template (tree context, tree name, tree parm_list,
3048 tsubst_flags_t complain)
3054 name = TYPE_IDENTIFIER (name);
3055 else if (DECL_P (name))
3056 name = DECL_NAME (name);
3057 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
3059 if (!dependent_type_p (context)
3060 || currently_open_class (context))
3062 tree tmpl = NULL_TREE;
3064 if (MAYBE_CLASS_TYPE_P (context))
3065 tmpl = lookup_field (context, name, 0, false);
3067 if (!tmpl || !DECL_CLASS_TEMPLATE_P (tmpl))
3069 if (complain & tf_error)
3070 error ("no class template named %q#T in %q#T", name, context);
3071 return error_mark_node;
3075 && !comp_template_parms (DECL_TEMPLATE_PARMS (tmpl), parm_list))
3077 if (complain & tf_error)
3079 error ("template parameters do not match template");
3080 error ("%q+D declared here", tmpl);
3082 return error_mark_node;
3085 if (complain & tf_error)
3086 perform_or_defer_access_check (TYPE_BINFO (context), tmpl, tmpl);
3091 /* Build the UNBOUND_CLASS_TEMPLATE. */
3092 t = cxx_make_type (UNBOUND_CLASS_TEMPLATE);
3093 TYPE_CONTEXT (t) = FROB_CONTEXT (context);
3094 TREE_TYPE (t) = NULL_TREE;
3095 SET_TYPE_STRUCTURAL_EQUALITY (t);
3097 /* Build the corresponding TEMPLATE_DECL. */
3098 d = build_decl (TEMPLATE_DECL, name, t);
3099 TYPE_NAME (TREE_TYPE (d)) = d;
3100 TYPE_STUB_DECL (TREE_TYPE (d)) = d;
3101 DECL_CONTEXT (d) = FROB_CONTEXT (context);
3102 DECL_ARTIFICIAL (d) = 1;
3103 DECL_TEMPLATE_PARMS (d) = parm_list;
3110 /* Push the declarations of builtin types into the namespace.
3111 RID_INDEX is the index of the builtin type in the array
3112 RID_POINTERS. NAME is the name used when looking up the builtin
3113 type. TYPE is the _TYPE node for the builtin type. */
3116 record_builtin_type (enum rid rid_index,
3120 tree rname = NULL_TREE, tname = NULL_TREE;
3121 tree tdecl = NULL_TREE;
3123 if ((int) rid_index < (int) RID_MAX)
3124 rname = ridpointers[(int) rid_index];
3126 tname = get_identifier (name);
3128 /* The calls to SET_IDENTIFIER_GLOBAL_VALUE below should be
3129 eliminated. Built-in types should not be looked up name; their
3130 names are keywords that the parser can recognize. However, there
3131 is code in c-common.c that uses identifier_global_value to look
3132 up built-in types by name. */
3135 tdecl = build_decl (TYPE_DECL, tname, type);
3136 DECL_ARTIFICIAL (tdecl) = 1;
3137 SET_IDENTIFIER_GLOBAL_VALUE (tname, tdecl);
3143 tdecl = build_decl (TYPE_DECL, rname, type);
3144 DECL_ARTIFICIAL (tdecl) = 1;
3146 SET_IDENTIFIER_GLOBAL_VALUE (rname, tdecl);
3149 if (!TYPE_NAME (type))
3150 TYPE_NAME (type) = tdecl;
3153 debug_hooks->type_decl (tdecl, 0);
3156 /* Record one of the standard Java types.
3157 * Declare it as having the given NAME.
3158 * If SIZE > 0, it is the size of one of the integral types;
3159 * otherwise it is the negative of the size of one of the other types. */
3162 record_builtin_java_type (const char* name, int size)
3166 type = make_signed_type (size);
3167 else if (size > -32)
3168 { /* "__java_char" or ""__java_boolean". */
3169 type = make_unsigned_type (-size);
3170 /*if (size == -1) TREE_SET_CODE (type, BOOLEAN_TYPE);*/
3173 { /* "__java_float" or ""__java_double". */
3174 type = make_node (REAL_TYPE);
3175 TYPE_PRECISION (type) = - size;
3178 record_builtin_type (RID_MAX, name, type);
3179 decl = TYPE_NAME (type);
3181 /* Suppress generate debug symbol entries for these types,
3182 since for normal C++ they are just clutter.
3183 However, push_lang_context undoes this if extern "Java" is seen. */
3184 DECL_IGNORED_P (decl) = 1;
3186 TYPE_FOR_JAVA (type) = 1;
3190 /* Push a type into the namespace so that the back ends ignore it. */
3193 record_unknown_type (tree type, const char* name)
3195 tree decl = pushdecl (build_decl (TYPE_DECL, get_identifier (name), type));
3196 /* Make sure the "unknown type" typedecl gets ignored for debug info. */
3197 DECL_IGNORED_P (decl) = 1;
3198 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
3199 TYPE_SIZE (type) = TYPE_SIZE (void_type_node);
3200 TYPE_ALIGN (type) = 1;
3201 TYPE_USER_ALIGN (type) = 0;
3202 SET_TYPE_MODE (type, TYPE_MODE (void_type_node));
3205 /* A string for which we should create an IDENTIFIER_NODE at
3208 typedef struct predefined_identifier
3210 /* The name of the identifier. */
3211 const char *const name;
3212 /* The place where the IDENTIFIER_NODE should be stored. */
3214 /* Nonzero if this is the name of a constructor or destructor. */
3215 const int ctor_or_dtor_p;
3216 } predefined_identifier;
3218 /* Create all the predefined identifiers. */
3221 initialize_predefined_identifiers (void)
3223 const predefined_identifier *pid;
3225 /* A table of identifiers to create at startup. */
3226 static const predefined_identifier predefined_identifiers[] = {
3227 { "C++", &lang_name_cplusplus, 0 },
3228 { "C", &lang_name_c, 0 },
3229 { "Java", &lang_name_java, 0 },
3230 /* Some of these names have a trailing space so that it is
3231 impossible for them to conflict with names written by users. */
3232 { "__ct ", &ctor_identifier, 1 },
3233 { "__base_ctor ", &base_ctor_identifier, 1 },
3234 { "__comp_ctor ", &complete_ctor_identifier, 1 },
3235 { "__dt ", &dtor_identifier, 1 },
3236 { "__comp_dtor ", &complete_dtor_identifier, 1 },
3237 { "__base_dtor ", &base_dtor_identifier, 1 },
3238 { "__deleting_dtor ", &deleting_dtor_identifier, 1 },
3239 { IN_CHARGE_NAME, &in_charge_identifier, 0 },
3240 { "nelts", &nelts_identifier, 0 },
3241 { THIS_NAME, &this_identifier, 0 },
3242 { VTABLE_DELTA_NAME, &delta_identifier, 0 },
3243 { VTABLE_PFN_NAME, &pfn_identifier, 0 },
3244 { "_vptr", &vptr_identifier, 0 },
3245 { "__vtt_parm", &vtt_parm_identifier, 0 },
3246 { "::", &global_scope_name, 0 },
3247 { "std", &std_identifier, 0 },
3251 for (pid = predefined_identifiers; pid->name; ++pid)
3253 *pid->node = get_identifier (pid->name);
3254 if (pid->ctor_or_dtor_p)
3255 IDENTIFIER_CTOR_OR_DTOR_P (*pid->node) = 1;
3259 /* Create the predefined scalar types of C,
3260 and some nodes representing standard constants (0, 1, (void *)0).
3261 Initialize the global binding level.
3262 Make definitions for built-in primitive functions. */
3265 cxx_init_decl_processing (void)
3268 tree void_ftype_ptr;
3270 build_common_tree_nodes (flag_signed_char, false);
3272 /* Create all the identifiers we need. */
3273 initialize_predefined_identifiers ();
3275 /* Create the global variables. */
3276 push_to_top_level ();
3278 current_function_decl = NULL_TREE;
3279 current_binding_level = NULL;
3280 /* Enter the global namespace. */
3281 gcc_assert (global_namespace == NULL_TREE);
3282 global_namespace = build_lang_decl (NAMESPACE_DECL, global_scope_name,
3284 TREE_PUBLIC (global_namespace) = 1;
3285 begin_scope (sk_namespace, global_namespace);
3287 current_lang_name = NULL_TREE;
3289 if (flag_visibility_ms_compat)
3290 default_visibility = VISIBILITY_HIDDEN;
3293 current_lang_name = lang_name_c;
3295 /* Create the `std' namespace. */
3296 push_namespace (std_identifier);
3297 std_node = current_namespace;
3300 c_common_nodes_and_builtins ();
3302 java_byte_type_node = record_builtin_java_type ("__java_byte", 8);
3303 java_short_type_node = record_builtin_java_type ("__java_short", 16);
3304 java_int_type_node = record_builtin_java_type ("__java_int", 32);
3305 java_long_type_node = record_builtin_java_type ("__java_long", 64);
3306 java_float_type_node = record_builtin_java_type ("__java_float", -32);
3307 java_double_type_node = record_builtin_java_type ("__java_double", -64);
3308 java_char_type_node = record_builtin_java_type ("__java_char", -16);
3309 java_boolean_type_node = record_builtin_java_type ("__java_boolean", -1);
3311 integer_two_node = build_int_cst (NULL_TREE, 2);
3312 integer_three_node = build_int_cst (NULL_TREE, 3);
3314 record_builtin_type (RID_BOOL, "bool", boolean_type_node);
3315 truthvalue_type_node = boolean_type_node;
3316 truthvalue_false_node = boolean_false_node;
3317 truthvalue_true_node = boolean_true_node;
3319 empty_except_spec = build_tree_list (NULL_TREE, NULL_TREE);
3322 record_builtin_type (RID_MAX, NULL, string_type_node);
3325 delta_type_node = ptrdiff_type_node;
3326 vtable_index_type = ptrdiff_type_node;
3328 vtt_parm_type = build_pointer_type (const_ptr_type_node);
3329 void_ftype = build_function_type (void_type_node, void_list_node);
3330 void_ftype_ptr = build_function_type (void_type_node,
3331 tree_cons (NULL_TREE,
3335 = build_exception_variant (void_ftype_ptr, empty_except_spec);
3337 /* C++ extensions */
3339 unknown_type_node = make_node (UNKNOWN_TYPE);
3340 record_unknown_type (unknown_type_node, "unknown type");
3342 /* Indirecting an UNKNOWN_TYPE node yields an UNKNOWN_TYPE node. */
3343 TREE_TYPE (unknown_type_node) = unknown_type_node;
3345 /* Looking up TYPE_POINTER_TO and TYPE_REFERENCE_TO yield the same
3347 TYPE_POINTER_TO (unknown_type_node) = unknown_type_node;
3348 TYPE_REFERENCE_TO (unknown_type_node) = unknown_type_node;
3350 init_list_type_node = make_node (UNKNOWN_TYPE);
3351 record_unknown_type (init_list_type_node, "init list");
3354 /* Make sure we get a unique function type, so we can give
3355 its pointer type a name. (This wins for gdb.) */
3356 tree vfunc_type = make_node (FUNCTION_TYPE);
3357 TREE_TYPE (vfunc_type) = integer_type_node;
3358 TYPE_ARG_TYPES (vfunc_type) = NULL_TREE;
3359 layout_type (vfunc_type);
3361 vtable_entry_type = build_pointer_type (vfunc_type);
3363 record_builtin_type (RID_MAX, VTBL_PTR_TYPE, vtable_entry_type);
3366 = build_cplus_array_type (vtable_entry_type, NULL_TREE);
3367 layout_type (vtbl_type_node);
3368 vtbl_type_node = build_qualified_type (vtbl_type_node, TYPE_QUAL_CONST);
3369 record_builtin_type (RID_MAX, NULL, vtbl_type_node);
3370 vtbl_ptr_type_node = build_pointer_type (vtable_entry_type);
3371 layout_type (vtbl_ptr_type_node);
3372 record_builtin_type (RID_MAX, NULL, vtbl_ptr_type_node);
3374 push_namespace (get_identifier ("__cxxabiv1"));
3375 abi_node = current_namespace;
3378 global_type_node = make_node (LANG_TYPE);
3379 record_unknown_type (global_type_node, "global type");
3382 current_lang_name = lang_name_cplusplus;
3386 tree bad_alloc_type_node;
3387 tree bad_alloc_decl;
3388 tree newtype, deltype;
3389 tree ptr_ftype_sizetype;
3391 push_namespace (std_identifier);
3392 bad_alloc_id = get_identifier ("bad_alloc");
3393 bad_alloc_type_node = make_class_type (RECORD_TYPE);
3394 TYPE_CONTEXT (bad_alloc_type_node) = current_namespace;
3396 = create_implicit_typedef (bad_alloc_id, bad_alloc_type_node);
3397 DECL_CONTEXT (bad_alloc_decl) = current_namespace;
3398 TYPE_STUB_DECL (bad_alloc_type_node) = bad_alloc_decl;
3402 = build_function_type (ptr_type_node,
3403 tree_cons (NULL_TREE,
3406 newtype = build_exception_variant
3407 (ptr_ftype_sizetype, add_exception_specifier
3408 (NULL_TREE, bad_alloc_type_node, -1));
3409 deltype = build_exception_variant (void_ftype_ptr, empty_except_spec);
3410 push_cp_library_fn (NEW_EXPR, newtype);
3411 push_cp_library_fn (VEC_NEW_EXPR, newtype);
3412 global_delete_fndecl = push_cp_library_fn (DELETE_EXPR, deltype);
3413 push_cp_library_fn (VEC_DELETE_EXPR, deltype);
3417 = build_library_fn_ptr ("__cxa_pure_virtual", void_ftype);
3419 /* Perform other language dependent initializations. */
3420 init_class_processing ();
3421 init_rtti_processing ();
3423 if (flag_exceptions)
3424 init_exception_processing ();
3426 if (! supports_one_only ())
3429 make_fname_decl = cp_make_fname_decl;
3430 start_fname_decls ();
3432 /* Show we use EH for cleanups. */
3433 if (flag_exceptions)
3434 using_eh_for_cleanups ();
3437 /* Generate an initializer for a function naming variable from
3438 NAME. NAME may be NULL, to indicate a dependent name. TYPE_P is
3439 filled in with the type of the init. */
3442 cp_fname_init (const char* name, tree *type_p)
3444 tree domain = NULL_TREE;
3446 tree init = NULL_TREE;
3451 length = strlen (name);
3452 domain = build_index_type (size_int (length));
3453 init = build_string (length + 1, name);
3456 type = build_qualified_type (char_type_node, TYPE_QUAL_CONST);
3457 type = build_cplus_array_type (type, domain);
3462 TREE_TYPE (init) = type;
3464 init = error_mark_node;
3469 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3470 decl, NAME is the initialization string and TYPE_DEP indicates whether
3471 NAME depended on the type of the function. We make use of that to detect
3472 __PRETTY_FUNCTION__ inside a template fn. This is being done
3473 lazily at the point of first use, so we mustn't push the decl now. */
3476 cp_make_fname_decl (tree id, int type_dep)
3478 const char *const name = (type_dep && processing_template_decl
3479 ? NULL : fname_as_string (type_dep));
3481 tree init = cp_fname_init (name, &type);
3482 tree decl = build_decl (VAR_DECL, id, type);
3485 free (CONST_CAST (char *, name));
3487 /* As we're using pushdecl_with_scope, we must set the context. */
3488 DECL_CONTEXT (decl) = current_function_decl;
3489 DECL_PRETTY_FUNCTION_P (decl) = type_dep;
3491 TREE_STATIC (decl) = 1;
3492 TREE_READONLY (decl) = 1;
3493 DECL_ARTIFICIAL (decl) = 1;
3495 TREE_USED (decl) = 1;
3497 if (current_function_decl)
3499 struct cp_binding_level *b = current_binding_level;
3500 while (b->level_chain->kind != sk_function_parms)
3502 pushdecl_with_scope (decl, b, /*is_friend=*/false);
3503 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, NULL_TREE,
3504 LOOKUP_ONLYCONVERTING);
3507 pushdecl_top_level_and_finish (decl, init);
3513 builtin_function_1 (tree decl, tree context, bool is_global)
3515 tree id = DECL_NAME (decl);
3516 const char *name = IDENTIFIER_POINTER (id);
3518 retrofit_lang_decl (decl);
3520 /* All nesting of C++ functions is lexical; there is never a "static
3521 chain" in the sense of GNU C nested functions. */
3522 DECL_NO_STATIC_CHAIN (decl) = 1;
3524 DECL_ARTIFICIAL (decl) = 1;
3525 SET_OVERLOADED_OPERATOR_CODE (decl, ERROR_MARK);
3526 SET_DECL_LANGUAGE (decl, lang_c);
3527 /* Runtime library routines are, by definition, available in an
3528 external shared object. */
3529 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
3530 DECL_VISIBILITY_SPECIFIED (decl) = 1;
3532 DECL_CONTEXT (decl) = context;
3535 pushdecl_top_level (decl);
3539 /* A function in the user's namespace should have an explicit
3540 declaration before it is used. Mark the built-in function as
3541 anticipated but not actually declared. */
3542 if (name[0] != '_' || name[1] != '_')
3543 DECL_ANTICIPATED (decl) = 1;
3544 else if (strncmp (name + 2, "builtin_", strlen ("builtin_")) != 0)
3546 size_t len = strlen (name);
3548 /* Treat __*_chk fortification functions as anticipated as well,
3549 unless they are __builtin_*. */
3550 if (len > strlen ("___chk")
3551 && memcmp (name + len - strlen ("_chk"),
3552 "_chk", strlen ("_chk") + 1) == 0)
3553 DECL_ANTICIPATED (decl) = 1;
3560 cxx_builtin_function (tree decl)
3562 tree id = DECL_NAME (decl);
3563 const char *name = IDENTIFIER_POINTER (id);
3564 /* All builtins that don't begin with an '_' should additionally
3565 go in the 'std' namespace. */
3568 tree decl2 = copy_node(decl);
3569 push_namespace (std_identifier);
3570 builtin_function_1 (decl2, std_node, false);
3574 return builtin_function_1 (decl, NULL_TREE, false);
3577 /* Like cxx_builtin_function, but guarantee the function is added to the global
3578 scope. This is to allow function specific options to add new machine
3579 dependent builtins when the target ISA changes via attribute((target(...)))
3580 which saves space on program startup if the program does not use non-generic
3584 cxx_builtin_function_ext_scope (tree decl)
3587 tree id = DECL_NAME (decl);
3588 const char *name = IDENTIFIER_POINTER (id);
3589 /* All builtins that don't begin with an '_' should additionally
3590 go in the 'std' namespace. */
3593 tree decl2 = copy_node(decl);
3594 push_namespace (std_identifier);
3595 builtin_function_1 (decl2, std_node, true);
3599 return builtin_function_1 (decl, NULL_TREE, true);
3602 /* Generate a FUNCTION_DECL with the typical flags for a runtime library
3603 function. Not called directly. */
3606 build_library_fn_1 (tree name, enum tree_code operator_code, tree type)
3608 tree fn = build_lang_decl (FUNCTION_DECL, name, type);
3609 DECL_EXTERNAL (fn) = 1;
3610 TREE_PUBLIC (fn) = 1;
3611 DECL_ARTIFICIAL (fn) = 1;
3612 SET_OVERLOADED_OPERATOR_CODE (fn, operator_code);
3613 SET_DECL_LANGUAGE (fn, lang_c);
3614 /* Runtime library routines are, by definition, available in an
3615 external shared object. */
3616 DECL_VISIBILITY (fn) = VISIBILITY_DEFAULT;
3617 DECL_VISIBILITY_SPECIFIED (fn) = 1;
3621 /* Returns the _DECL for a library function with C linkage.
3622 We assume that such functions never throw; if this is incorrect,
3623 callers should unset TREE_NOTHROW. */
3626 build_library_fn (tree name, tree type)
3628 tree fn = build_library_fn_1 (name, ERROR_MARK, type);
3629 TREE_NOTHROW (fn) = 1;
3633 /* Returns the _DECL for a library function with C++ linkage. */
3636 build_cp_library_fn (tree name, enum tree_code operator_code, tree type)
3638 tree fn = build_library_fn_1 (name, operator_code, type);
3639 TREE_NOTHROW (fn) = TYPE_NOTHROW_P (type);
3640 DECL_CONTEXT (fn) = FROB_CONTEXT (current_namespace);
3641 SET_DECL_LANGUAGE (fn, lang_cplusplus);
3645 /* Like build_library_fn, but takes a C string instead of an
3649 build_library_fn_ptr (const char* name, tree type)
3651 return build_library_fn (get_identifier (name), type);
3654 /* Like build_cp_library_fn, but takes a C string instead of an
3658 build_cp_library_fn_ptr (const char* name, tree type)
3660 return build_cp_library_fn (get_identifier (name), ERROR_MARK, type);
3663 /* Like build_library_fn, but also pushes the function so that we will
3664 be able to find it via IDENTIFIER_GLOBAL_VALUE. Also, the function
3665 may throw exceptions listed in RAISES. */
3668 push_library_fn (tree name, tree type, tree raises)
3673 type = build_exception_variant (type, raises);
3675 fn = build_library_fn (name, type);
3676 pushdecl_top_level (fn);
3680 /* Like build_cp_library_fn, but also pushes the function so that it
3681 will be found by normal lookup. */
3684 push_cp_library_fn (enum tree_code operator_code, tree type)
3686 tree fn = build_cp_library_fn (ansi_opname (operator_code),
3693 /* Like push_library_fn, but takes a TREE_LIST of parm types rather than
3697 push_void_library_fn (tree name, tree parmtypes)
3699 tree type = build_function_type (void_type_node, parmtypes);
3700 return push_library_fn (name, type, NULL_TREE);
3703 /* Like push_library_fn, but also note that this function throws
3704 and does not return. Used for __throw_foo and the like. */
3707 push_throw_library_fn (tree name, tree type)
3709 tree fn = push_library_fn (name, type, NULL_TREE);
3710 TREE_THIS_VOLATILE (fn) = 1;
3711 TREE_NOTHROW (fn) = 0;
3715 /* When we call finish_struct for an anonymous union, we create
3716 default copy constructors and such. But, an anonymous union
3717 shouldn't have such things; this function undoes the damage to the
3718 anonymous union type T.
3720 (The reason that we create the synthesized methods is that we don't
3721 distinguish `union { int i; }' from `typedef union { int i; } U'.
3722 The first is an anonymous union; the second is just an ordinary
3726 fixup_anonymous_aggr (tree t)
3730 /* Wipe out memory of synthesized methods. */
3731 TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
3732 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
3733 TYPE_HAS_INIT_REF (t) = 0;
3734 TYPE_HAS_CONST_INIT_REF (t) = 0;
3735 TYPE_HAS_ASSIGN_REF (t) = 0;
3736 TYPE_HAS_CONST_ASSIGN_REF (t) = 0;
3738 /* Splice the implicitly generated functions out of the TYPE_METHODS
3740 q = &TYPE_METHODS (t);
3743 if (DECL_ARTIFICIAL (*q))
3744 *q = TREE_CHAIN (*q);
3746 q = &TREE_CHAIN (*q);
3749 /* ISO C++ 9.5.3. Anonymous unions may not have function members. */
3750 if (TYPE_METHODS (t))
3752 tree decl = TYPE_MAIN_DECL (t);
3754 if (TREE_CODE (t) != UNION_TYPE)
3755 error ("%Jan anonymous struct cannot have function members", decl);
3757 error ("%Jan anonymous union cannot have function members", decl);
3760 /* Anonymous aggregates cannot have fields with ctors, dtors or complex
3761 assignment operators (because they cannot have these methods themselves).
3762 For anonymous unions this is already checked because they are not allowed
3763 in any union, otherwise we have to check it. */
3764 if (TREE_CODE (t) != UNION_TYPE)
3768 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3769 if (TREE_CODE (field) == FIELD_DECL)
3771 type = TREE_TYPE (field);
3772 if (CLASS_TYPE_P (type))
3774 if (TYPE_NEEDS_CONSTRUCTING (type))
3775 error ("member %q+#D with constructor not allowed "
3776 "in anonymous aggregate", field);
3777 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3778 error ("member %q+#D with destructor not allowed "
3779 "in anonymous aggregate", field);
3780 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3781 error ("member %q+#D with copy assignment operator "
3782 "not allowed in anonymous aggregate", field);
3788 /* Make sure that a declaration with no declarator is well-formed, i.e.
3789 just declares a tagged type or anonymous union.
3791 Returns the type declared; or NULL_TREE if none. */
3794 check_tag_decl (cp_decl_specifier_seq *declspecs)
3796 int saw_friend = declspecs->specs[(int)ds_friend] != 0;
3797 int saw_typedef = declspecs->specs[(int)ds_typedef] != 0;
3798 /* If a class, struct, or enum type is declared by the DECLSPECS
3799 (i.e, if a class-specifier, enum-specifier, or non-typename
3800 elaborated-type-specifier appears in the DECLSPECS),
3801 DECLARED_TYPE is set to the corresponding type. */
3802 tree declared_type = NULL_TREE;
3803 bool error_p = false;
3805 if (declspecs->multiple_types_p)
3806 error ("multiple types in one declaration");
3807 else if (declspecs->redefined_builtin_type)
3809 if (!in_system_header)
3810 permerror (input_location, "redeclaration of C++ built-in type %qT",
3811 declspecs->redefined_builtin_type);
3816 && TYPE_P (declspecs->type)
3817 && ((TREE_CODE (declspecs->type) != TYPENAME_TYPE
3818 && MAYBE_CLASS_TYPE_P (declspecs->type))
3819 || TREE_CODE (declspecs->type) == ENUMERAL_TYPE))
3820 declared_type = declspecs->type;
3821 else if (declspecs->type == error_mark_node)
3823 if (declared_type == NULL_TREE && ! saw_friend && !error_p)
3824 permerror (input_location, "declaration does not declare anything");
3825 /* Check for an anonymous union. */
3826 else if (declared_type && RECORD_OR_UNION_CODE_P (TREE_CODE (declared_type))
3827 && TYPE_ANONYMOUS_P (declared_type))
3829 /* 7/3 In a simple-declaration, the optional init-declarator-list
3830 can be omitted only when declaring a class (clause 9) or
3831 enumeration (7.2), that is, when the decl-specifier-seq contains
3832 either a class-specifier, an elaborated-type-specifier with
3833 a class-key (9.1), or an enum-specifier. In these cases and
3834 whenever a class-specifier or enum-specifier is present in the
3835 decl-specifier-seq, the identifiers in these specifiers are among
3836 the names being declared by the declaration (as class-name,
3837 enum-names, or enumerators, depending on the syntax). In such
3838 cases, and except for the declaration of an unnamed bit-field (9.6),
3839 the decl-specifier-seq shall introduce one or more names into the
3840 program, or shall redeclare a name introduced by a previous
3841 declaration. [Example:
3842 enum { }; // ill-formed
3843 typedef class { }; // ill-formed
3847 error ("missing type-name in typedef-declaration");
3850 /* Anonymous unions are objects, so they can have specifiers. */;
3851 SET_ANON_AGGR_TYPE_P (declared_type);
3853 if (TREE_CODE (declared_type) != UNION_TYPE && !in_system_header)
3854 pedwarn (input_location, OPT_pedantic, "ISO C++ prohibits anonymous structs");
3859 if (declspecs->specs[(int)ds_inline]
3860 || declspecs->specs[(int)ds_virtual])
3861 error ("%qs can only be specified for functions",
3862 declspecs->specs[(int)ds_inline]
3863 ? "inline" : "virtual");
3865 && (!current_class_type
3866 || current_scope () != current_class_type))
3867 error ("%<friend%> can only be specified inside a class");
3868 else if (declspecs->specs[(int)ds_explicit])
3869 error ("%<explicit%> can only be specified for constructors");
3870 else if (declspecs->storage_class)
3871 error ("a storage class can only be specified for objects "
3873 else if (declspecs->specs[(int)ds_const]
3874 || declspecs->specs[(int)ds_volatile]
3875 || declspecs->specs[(int)ds_restrict]
3876 || declspecs->specs[(int)ds_thread])
3877 error ("qualifiers can only be specified for objects "
3879 else if (saw_typedef)
3880 warning (0, "%<typedef%> was ignored in this declaration");
3883 return declared_type;
3886 /* Called when a declaration is seen that contains no names to declare.
3887 If its type is a reference to a structure, union or enum inherited
3888 from a containing scope, shadow that tag name for the current scope
3889 with a forward reference.
3890 If its type defines a new named structure or union
3891 or defines an enum, it is valid but we need not do anything here.
3892 Otherwise, it is an error.
3894 C++: may have to grok the declspecs to learn about static,
3895 complain for anonymous unions.
3897 Returns the TYPE declared -- or NULL_TREE if none. */
3900 shadow_tag (cp_decl_specifier_seq *declspecs)
3902 tree t = check_tag_decl (declspecs);
3907 if (declspecs->attributes)
3909 warning (0, "attribute ignored in declaration of %q+#T", t);
3910 warning (0, "attribute for %q+#T must follow the %qs keyword",
3911 t, class_key_or_enum_as_string (t));
3915 if (maybe_process_partial_specialization (t) == error_mark_node)
3918 /* This is where the variables in an anonymous union are
3919 declared. An anonymous union declaration looks like:
3921 because there is no declarator after the union, the parser
3922 sends that declaration here. */
3923 if (ANON_AGGR_TYPE_P (t))
3925 fixup_anonymous_aggr (t);
3927 if (TYPE_FIELDS (t))
3929 tree decl = grokdeclarator (/*declarator=*/NULL,
3930 declspecs, NORMAL, 0, NULL);
3931 finish_anon_union (decl);
3938 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3941 groktypename (cp_decl_specifier_seq *type_specifiers,
3942 const cp_declarator *declarator)
3946 attrs = type_specifiers->attributes;
3947 type_specifiers->attributes = NULL_TREE;
3948 type = grokdeclarator (declarator, type_specifiers, TYPENAME, 0, &attrs);
3949 if (attrs && type != error_mark_node)
3951 if (CLASS_TYPE_P (type))
3952 warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
3953 "outside of definition", type);
3954 else if (MAYBE_CLASS_TYPE_P (type))
3955 /* A template type parameter or other dependent type. */
3956 warning (OPT_Wattributes, "ignoring attributes applied to dependent "
3957 "type %qT without an associated declaration", type);
3959 cplus_decl_attributes (&type, attrs, 0);
3964 /* Process a DECLARATOR for a function-scope variable declaration,
3965 namespace-scope variable declaration, or function declaration.
3966 (Function definitions go through start_function; class member
3967 declarations appearing in the body of the class go through
3968 grokfield.) The DECL corresponding to the DECLARATOR is returned.
3969 If an error occurs, the error_mark_node is returned instead.
3971 DECLSPECS are the decl-specifiers for the declaration. INITIALIZED is
3972 SD_INITIALIZED if an explicit initializer is present, or SD_DEFAULTED
3973 for an explicitly defaulted function, or SD_DELETED for an explicitly
3974 deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
3975 implicitly initialized via a default constructor. ATTRIBUTES and
3976 PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
3977 *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
3978 set, the caller is responsible for calling pop_scope. */
3981 start_decl (const cp_declarator *declarator,
3982 cp_decl_specifier_seq *declspecs,
3985 tree prefix_attributes,
3986 tree *pushed_scope_p)
3994 *pushed_scope_p = NULL_TREE;
3996 /* An object declared as __attribute__((deprecated)) suppresses
3997 warnings of uses of other deprecated items. */
3998 if (lookup_attribute ("deprecated", attributes))
3999 deprecated_state = DEPRECATED_SUPPRESS;
4001 attributes = chainon (attributes, prefix_attributes);
4003 decl = grokdeclarator (declarator, declspecs, NORMAL, initialized,
4006 deprecated_state = DEPRECATED_NORMAL;
4008 if (decl == NULL_TREE || TREE_CODE (decl) == VOID_TYPE
4009 || decl == error_mark_node)
4010 return error_mark_node;
4012 type = TREE_TYPE (decl);
4014 context = DECL_CONTEXT (decl);
4018 *pushed_scope_p = push_scope (context);
4020 /* We are only interested in class contexts, later. */
4021 if (TREE_CODE (context) == NAMESPACE_DECL)
4022 context = NULL_TREE;
4026 /* Is it valid for this decl to have an initializer at all?
4027 If not, set INITIALIZED to zero, which will indirectly
4028 tell `cp_finish_decl' to ignore the initializer once it is parsed. */
4029 switch (TREE_CODE (decl))
4032 error ("typedef %qD is initialized (use decltype instead)", decl);
4033 return error_mark_node;
4036 if (initialized == SD_DELETED)
4037 /* We'll handle the rest of the semantics later, but we need to
4038 set this now so it's visible to duplicate_decls. */
4039 DECL_DELETED_FN (decl) = 1;
4048 if (! toplevel_bindings_p ()
4049 && DECL_EXTERNAL (decl))
4050 warning (0, "declaration of %q#D has %<extern%> and is initialized",
4052 DECL_EXTERNAL (decl) = 0;
4053 if (toplevel_bindings_p ())
4054 TREE_STATIC (decl) = 1;
4057 /* If this is a typedef that names the class for linkage purposes
4058 (7.1.3p8), apply any attributes directly to the type. */
4059 if (TREE_CODE (decl) == TYPE_DECL
4060 && TAGGED_TYPE_P (TREE_TYPE (decl))
4061 && decl == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (decl))))
4062 flags = ATTR_FLAG_TYPE_IN_PLACE;
4066 /* Set attributes here so if duplicate decl, will have proper attributes. */
4067 cplus_decl_attributes (&decl, attributes, flags);
4069 /* Dllimported symbols cannot be defined. Static data members (which
4070 can be initialized in-class and dllimported) go through grokfield,
4071 not here, so we don't need to exclude those decls when checking for
4073 if (initialized && DECL_DLLIMPORT_P (decl))
4075 error ("definition of %q#D is marked %<dllimport%>", decl);
4076 DECL_DLLIMPORT_P (decl) = 0;
4079 /* If #pragma weak was used, mark the decl weak now. */
4080 maybe_apply_pragma_weak (decl);
4082 if (TREE_CODE (decl) == FUNCTION_DECL
4083 && DECL_DECLARED_INLINE_P (decl)
4084 && DECL_UNINLINABLE (decl)
4085 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
4086 warning (0, "inline function %q+D given attribute noinline", decl);
4088 if (context && COMPLETE_TYPE_P (complete_type (context)))
4090 if (TREE_CODE (decl) == VAR_DECL)
4092 tree field = lookup_field (context, DECL_NAME (decl), 0, false);
4093 if (field == NULL_TREE || TREE_CODE (field) != VAR_DECL)
4094 error ("%q#D is not a static member of %q#T", decl, context);
4097 if (DECL_CONTEXT (field) != context)
4099 if (!same_type_p (DECL_CONTEXT (field), context))
4100 permerror (input_location, "ISO C++ does not permit %<%T::%D%> "
4101 "to be defined as %<%T::%D%>",
4102 DECL_CONTEXT (field), DECL_NAME (decl),
4103 context, DECL_NAME (decl));
4104 DECL_CONTEXT (decl) = DECL_CONTEXT (field);
4106 if (processing_specialization
4107 && template_class_depth (context) == 0
4108 && CLASSTYPE_TEMPLATE_SPECIALIZATION (context))
4109 error ("template header not allowed in member definition "
4110 "of explicitly specialized class");
4111 /* Static data member are tricky; an in-class initialization
4112 still doesn't provide a definition, so the in-class
4113 declaration will have DECL_EXTERNAL set, but will have an
4114 initialization. Thus, duplicate_decls won't warn
4115 about this situation, and so we check here. */
4116 if (initialized && DECL_INITIALIZED_IN_CLASS_P (field))
4117 error ("duplicate initialization of %qD", decl);
4118 if (duplicate_decls (decl, field, /*newdecl_is_friend=*/false))
4124 tree field = check_classfn (context, decl,
4125 (processing_template_decl
4126 > template_class_depth (context))
4127 ? current_template_parms
4129 if (field && field != error_mark_node
4130 && duplicate_decls (decl, field,
4131 /*newdecl_is_friend=*/false))
4135 /* cp_finish_decl sets DECL_EXTERNAL if DECL_IN_AGGR_P is set. */
4136 DECL_IN_AGGR_P (decl) = 0;
4137 /* Do not mark DECL as an explicit specialization if it was not
4138 already marked as an instantiation; a declaration should
4139 never be marked as a specialization unless we know what
4140 template is being specialized. */
4141 if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
4143 SET_DECL_TEMPLATE_SPECIALIZATION (decl);
4145 /* [temp.expl.spec] An explicit specialization of a static data
4146 member of a template is a definition if the declaration
4147 includes an initializer; otherwise, it is a declaration.
4149 We check for processing_specialization so this only applies
4150 to the new specialization syntax. */
4151 if (!initialized && processing_specialization)
4152 DECL_EXTERNAL (decl) = 1;
4155 if (DECL_EXTERNAL (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))
4156 permerror (input_location, "declaration of %q#D outside of class is not definition",
4160 was_public = TREE_PUBLIC (decl);
4162 /* Enter this declaration into the symbol table. */
4163 decl = maybe_push_decl (decl);
4165 if (processing_template_decl)
4166 decl = push_template_decl (decl);
4167 if (decl == error_mark_node)
4168 return error_mark_node;
4170 /* Tell the back end to use or not use .common as appropriate. If we say
4171 -fconserve-space, we want this to save .data space, at the expense of
4172 wrong semantics. If we say -fno-conserve-space, we want this to
4173 produce errors about redefs; to do this we force variables into the
4175 if (flag_conserve_space
4176 && TREE_CODE (decl) == VAR_DECL
4177 && TREE_PUBLIC (decl)
4178 && !DECL_THREAD_LOCAL_P (decl)
4179 && !have_global_bss_p ())
4180 DECL_COMMON (decl) = 1;
4182 if (TREE_CODE (decl) == VAR_DECL
4183 && DECL_NAMESPACE_SCOPE_P (decl) && !TREE_PUBLIC (decl) && !was_public
4184 && !DECL_THIS_STATIC (decl) && !DECL_ARTIFICIAL (decl))
4186 /* This is a const variable with implicit 'static'. Set
4187 DECL_THIS_STATIC so we can tell it from variables that are
4188 !TREE_PUBLIC because of the anonymous namespace. */
4189 gcc_assert (cp_type_readonly (TREE_TYPE (decl)));
4190 DECL_THIS_STATIC (decl) = 1;
4193 if (!processing_template_decl && TREE_CODE (decl) == VAR_DECL)
4194 start_decl_1 (decl, initialized);
4199 /* Process the declaration of a variable DECL. INITIALIZED is true
4200 iff DECL is explicitly initialized. (INITIALIZED is false if the
4201 variable is initialized via an implicitly-called constructor.)
4202 This function must be called for ordinary variables (including, for
4203 example, implicit instantiations of templates), but must not be
4204 called for template declarations. */
4207 start_decl_1 (tree decl, bool initialized)
4211 bool aggregate_definition_p;
4213 gcc_assert (!processing_template_decl);
4215 if (error_operand_p (decl))
4218 gcc_assert (TREE_CODE (decl) == VAR_DECL);
4220 type = TREE_TYPE (decl);
4221 complete_p = COMPLETE_TYPE_P (type);
4222 aggregate_definition_p = MAYBE_CLASS_TYPE_P (type) && !DECL_EXTERNAL (decl);
4224 /* If an explicit initializer is present, or if this is a definition
4225 of an aggregate, then we need a complete type at this point.
4226 (Scalars are always complete types, so there is nothing to
4227 check.) This code just sets COMPLETE_P; errors (if necessary)
4228 are issued below. */
4229 if ((initialized || aggregate_definition_p)
4231 && COMPLETE_TYPE_P (complete_type (type)))
4234 /* We will not yet have set TREE_READONLY on DECL if the type
4235 was "const", but incomplete, before this point. But, now, we
4236 have a complete type, so we can try again. */
4237 cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
4241 /* Is it valid for this decl to have an initializer at all? */
4243 /* Don't allow initializations for incomplete types except for
4244 arrays which might be completed by the initialization. */
4246 ; /* A complete type is ok. */
4247 else if (type_uses_auto (type))
4248 ; /* An auto type is ok. */
4249 else if (TREE_CODE (type) != ARRAY_TYPE)
4251 error ("variable %q#D has initializer but incomplete type", decl);
4252 type = TREE_TYPE (decl) = error_mark_node;
4254 else if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
4256 if (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl))
4257 error ("elements of array %q#D have incomplete type", decl);
4258 /* else we already gave an error in start_decl. */
4261 else if (aggregate_definition_p && !complete_p)
4263 if (type_uses_auto (type))
4264 error ("declaration of %q#D has no initializer", decl);
4266 error ("aggregate %q#D has incomplete type and cannot be defined",
4268 /* Change the type so that assemble_variable will give
4269 DECL an rtl we can live with: (mem (const_int 0)). */
4270 type = TREE_TYPE (decl) = error_mark_node;
4273 /* Create a new scope to hold this declaration if necessary.
4274 Whether or not a new scope is necessary cannot be determined
4275 until after the type has been completed; if the type is a
4276 specialization of a class template it is not until after
4277 instantiation has occurred that TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4278 will be set correctly. */
4279 maybe_push_cleanup_level (type);
4282 /* Handle initialization of references. DECL, TYPE, and INIT have the
4283 same meaning as in cp_finish_decl. *CLEANUP must be NULL on entry,
4284 but will be set to a new CLEANUP_STMT if a temporary is created
4285 that must be destroyed subsequently.
4287 Returns an initializer expression to use to initialize DECL, or
4288 NULL if the initialization can be performed statically.
4290 Quotes on semantics can be found in ARM 8.4.3. */
4293 grok_reference_init (tree decl, tree type, tree init, tree *cleanup)
4297 if (init == NULL_TREE)
4299 if ((DECL_LANG_SPECIFIC (decl) == 0
4300 || DECL_IN_AGGR_P (decl) == 0)
4301 && ! DECL_THIS_EXTERN (decl))
4302 error ("%qD declared as reference but not initialized", decl);
4306 if (TREE_CODE (init) == CONSTRUCTOR)
4308 error ("ISO C++ forbids use of initializer list to "
4309 "initialize reference %qD", decl);
4313 if (TREE_CODE (init) == TREE_LIST)
4314 init = build_x_compound_expr_from_list (init, "initializer");
4316 if (TREE_CODE (TREE_TYPE (type)) != ARRAY_TYPE
4317 && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE)
4318 /* Note: default conversion is only called in very special cases. */
4319 init = decay_conversion (init);
4321 /* Convert INIT to the reference type TYPE. This may involve the
4322 creation of a temporary, whose lifetime must be the same as that
4323 of the reference. If so, a DECL_EXPR for the temporary will be
4324 added just after the DECL_EXPR for DECL. That's why we don't set
4325 DECL_INITIAL for local references (instead assigning to them
4326 explicitly); we need to allow the temporary to be initialized
4328 tmp = initialize_reference (type, init, decl, cleanup);
4330 if (tmp == error_mark_node)
4332 else if (tmp == NULL_TREE)
4334 error ("cannot initialize %qT from %qT", type, TREE_TYPE (init));
4338 if (TREE_STATIC (decl) && !TREE_CONSTANT (tmp))
4341 DECL_INITIAL (decl) = tmp;
4346 /* Subroutine of check_initializer. We're initializing a DECL of
4347 std::initializer_list<T> TYPE from a braced-init-list INIT, and need to
4348 extend the lifetime of the underlying array to match that of the decl,
4349 just like for reference initialization. CLEANUP is as for
4350 grok_reference_init. */
4353 build_init_list_var_init (tree decl, tree type, tree init, tree *cleanup)
4355 tree aggr_init, array, arrtype;
4356 init = perform_implicit_conversion (type, init, tf_warning_or_error);
4357 aggr_init = TARGET_EXPR_INITIAL (init);
4358 init = build2 (INIT_EXPR, type, decl, init);
4360 array = AGGR_INIT_EXPR_ARG (aggr_init, 1);
4361 arrtype = TREE_TYPE (array);
4363 gcc_assert (TREE_CODE (array) == ADDR_EXPR);
4364 array = TREE_OPERAND (array, 0);
4365 /* If the array is constant, finish_compound_literal already made it a
4366 static variable and we don't need to do anything here. */
4367 if (decl && TREE_CODE (array) == TARGET_EXPR)
4370 tree var = set_up_extended_ref_temp (decl, array, cleanup, &subinit);
4371 var = build_address (var);
4372 var = convert (arrtype, var);
4373 AGGR_INIT_EXPR_ARG (aggr_init, 1) = var;
4374 init = build2 (COMPOUND_EXPR, TREE_TYPE (init), subinit, init);
4379 /* Designated initializers in arrays are not supported in GNU C++.
4380 The parser cannot detect this error since it does not know whether
4381 a given brace-enclosed initializer is for a class type or for an
4382 array. This function checks that CE does not use a designated
4383 initializer. If it does, an error is issued. Returns true if CE
4384 is valid, i.e., does not have a designated initializer. */
4387 check_array_designated_initializer (const constructor_elt *ce)
4389 /* Designated initializers for array elements are not supported. */
4392 /* The parser only allows identifiers as designated
4394 gcc_assert (TREE_CODE (ce->index) == IDENTIFIER_NODE);
4395 error ("name %qD used in a GNU-style designated "
4396 "initializer for an array", ce->index);
4403 /* When parsing `int a[] = {1, 2};' we don't know the size of the
4404 array until we finish parsing the initializer. If that's the
4405 situation we're in, update DECL accordingly. */
4408 maybe_deduce_size_from_array_init (tree decl, tree init)
4410 tree type = TREE_TYPE (decl);
4412 if (TREE_CODE (type) == ARRAY_TYPE
4413 && TYPE_DOMAIN (type) == NULL_TREE
4414 && TREE_CODE (decl) != TYPE_DECL)
4416 /* do_default is really a C-ism to deal with tentative definitions.
4417 But let's leave it here to ease the eventual merge. */
4418 int do_default = !DECL_EXTERNAL (decl);
4419 tree initializer = init ? init : DECL_INITIAL (decl);
4422 /* Check that there are no designated initializers in INIT, as
4423 those are not supported in GNU C++, and as the middle-end
4424 will crash if presented with a non-numeric designated
4426 if (initializer && TREE_CODE (initializer) == CONSTRUCTOR)
4428 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initializer);
4429 constructor_elt *ce;
4432 VEC_iterate (constructor_elt, v, i, ce);
4434 if (!check_array_designated_initializer (ce))
4440 failure = cp_complete_array_type (&TREE_TYPE (decl), initializer,
4444 error ("initializer fails to determine size of %qD", decl);
4445 TREE_TYPE (decl) = error_mark_node;
4447 else if (failure == 2)
4451 error ("array size missing in %qD", decl);
4452 TREE_TYPE (decl) = error_mark_node;
4454 /* If a `static' var's size isn't known, make it extern as
4455 well as static, so it does not get allocated. If it's not
4456 `static', then don't mark it extern; finish_incomplete_decl
4457 will give it a default size and it will get allocated. */
4458 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
4459 DECL_EXTERNAL (decl) = 1;
4461 else if (failure == 3)
4463 error ("zero-size array %qD", decl);
4464 TREE_TYPE (decl) = error_mark_node;
4468 cp_apply_type_quals_to_decl (cp_type_quals (TREE_TYPE (decl)), decl);
4470 layout_decl (decl, 0);
4474 /* Set DECL_SIZE, DECL_ALIGN, etc. for DECL (a VAR_DECL), and issue
4475 any appropriate error messages regarding the layout. */
4478 layout_var_decl (tree decl)
4482 type = TREE_TYPE (decl);
4483 if (type == error_mark_node)
4486 /* If we haven't already layed out this declaration, do so now.
4487 Note that we must not call complete type for an external object
4488 because it's type might involve templates that we are not
4489 supposed to instantiate yet. (And it's perfectly valid to say
4490 `extern X x' for some incomplete type `X'.) */
4491 if (!DECL_EXTERNAL (decl))
4492 complete_type (type);
4493 if (!DECL_SIZE (decl)
4494 && TREE_TYPE (decl) != error_mark_node
4495 && (COMPLETE_TYPE_P (type)
4496 || (TREE_CODE (type) == ARRAY_TYPE
4497 && !TYPE_DOMAIN (type)
4498 && COMPLETE_TYPE_P (TREE_TYPE (type)))))
4499 layout_decl (decl, 0);
4501 if (!DECL_EXTERNAL (decl) && DECL_SIZE (decl) == NULL_TREE)
4503 /* An automatic variable with an incomplete type: that is an error.
4504 Don't talk about array types here, since we took care of that
4505 message in grokdeclarator. */
4506 error ("storage size of %qD isn't known", decl);
4507 TREE_TYPE (decl) = error_mark_node;
4510 /* Keep this code around in case we later want to control debug info
4511 based on whether a type is "used". (jason 1999-11-11) */
4513 else if (!DECL_EXTERNAL (decl) && MAYBE_CLASS_TYPE_P (ttype))
4514 /* Let debugger know it should output info for this type. */
4515 note_debug_info_needed (ttype);
4517 if (TREE_STATIC (decl) && DECL_CLASS_SCOPE_P (decl))
4518 note_debug_info_needed (DECL_CONTEXT (decl));
4521 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4522 && DECL_SIZE (decl) != NULL_TREE
4523 && ! TREE_CONSTANT (DECL_SIZE (decl)))
4525 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4526 constant_expression_warning (DECL_SIZE (decl));
4529 error ("storage size of %qD isn't constant", decl);
4530 TREE_TYPE (decl) = error_mark_node;
4535 /* If a local static variable is declared in an inline function, or if
4536 we have a weak definition, we must endeavor to create only one
4537 instance of the variable at link-time. */
4540 maybe_commonize_var (tree decl)
4542 /* Static data in a function with comdat linkage also has comdat
4544 if (TREE_STATIC (decl)
4545 /* Don't mess with __FUNCTION__. */
4546 && ! DECL_ARTIFICIAL (decl)
4547 && DECL_FUNCTION_SCOPE_P (decl)
4548 /* Unfortunately, import_export_decl has not always been called
4549 before the function is processed, so we cannot simply check
4551 && (DECL_COMDAT (DECL_CONTEXT (decl))
4552 || ((DECL_DECLARED_INLINE_P (DECL_CONTEXT (decl))
4553 || DECL_TEMPLATE_INSTANTIATION (DECL_CONTEXT (decl)))
4554 && TREE_PUBLIC (DECL_CONTEXT (decl)))))
4558 /* With weak symbols, we simply make the variable COMDAT;
4559 that will cause copies in multiple translations units to
4561 comdat_linkage (decl);
4565 if (DECL_INITIAL (decl) == NULL_TREE
4566 || DECL_INITIAL (decl) == error_mark_node)
4568 /* Without weak symbols, we can use COMMON to merge
4569 uninitialized variables. */
4570 TREE_PUBLIC (decl) = 1;
4571 DECL_COMMON (decl) = 1;
4575 /* While for initialized variables, we must use internal
4576 linkage -- which means that multiple copies will not
4578 TREE_PUBLIC (decl) = 0;
4579 DECL_COMMON (decl) = 0;
4580 warning (0, "sorry: semantics of inline function static "
4581 "data %q+#D are wrong (you'll wind up "
4582 "with multiple copies)", decl);
4583 warning (0, "%J you can work around this by removing "
4589 else if (DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
4590 /* Set it up again; we might have set DECL_INITIAL since the last
4592 comdat_linkage (decl);
4595 /* Issue an error message if DECL is an uninitialized const variable. */
4598 check_for_uninitialized_const_var (tree decl)
4600 tree type = TREE_TYPE (decl);
4602 /* ``Unless explicitly declared extern, a const object does not have
4603 external linkage and must be initialized. ($8.4; $12.1)'' ARM
4605 if (TREE_CODE (decl) == VAR_DECL
4606 && TREE_CODE (type) != REFERENCE_TYPE
4607 && CP_TYPE_CONST_P (type)
4608 && !TYPE_NEEDS_CONSTRUCTING (type)
4609 && !DECL_INITIAL (decl))
4610 error ("uninitialized const %qD", decl);
4614 /* Structure holding the current initializer being processed by reshape_init.
4615 CUR is a pointer to the current element being processed, END is a pointer
4616 after the last element present in the initializer. */
4617 typedef struct reshape_iterator_t
4619 constructor_elt *cur;
4620 constructor_elt *end;
4623 static tree reshape_init_r (tree, reshape_iter *, bool);
4625 /* FIELD is a FIELD_DECL or NULL. In the former case, the value
4626 returned is the next FIELD_DECL (possibly FIELD itself) that can be
4627 initialized. If there are no more such fields, the return value
4631 next_initializable_field (tree field)
4634 && (TREE_CODE (field) != FIELD_DECL
4635 || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))
4636 || DECL_ARTIFICIAL (field)))
4637 field = TREE_CHAIN (field);
4642 /* Subroutine of reshape_init_array and reshape_init_vector, which does
4643 the actual work. ELT_TYPE is the element type of the array. MAX_INDEX is an
4644 INTEGER_CST representing the size of the array minus one (the maximum index),
4645 or NULL_TREE if the array was declared without specifying the size. D is
4646 the iterator within the constructor. */
4649 reshape_init_array_1 (tree elt_type, tree max_index, reshape_iter *d)
4652 bool sized_array_p = (max_index != NULL_TREE);
4653 unsigned HOST_WIDE_INT max_index_cst = 0;
4654 unsigned HOST_WIDE_INT index;
4656 /* The initializer for an array is always a CONSTRUCTOR. */
4657 new_init = build_constructor (init_list_type_node, NULL);
4661 /* Minus 1 is used for zero sized arrays. */
4662 if (integer_all_onesp (max_index))
4665 if (host_integerp (max_index, 1))
4666 max_index_cst = tree_low_cst (max_index, 1);
4667 /* sizetype is sign extended, not zero extended. */
4669 max_index_cst = tree_low_cst (fold_convert (size_type_node, max_index),
4673 /* Loop until there are no more initializers. */
4675 d->cur != d->end && (!sized_array_p || index <= max_index_cst);
4680 check_array_designated_initializer (d->cur);
4681 elt_init = reshape_init_r (elt_type, d, /*first_initializer_p=*/false);
4682 if (elt_init == error_mark_node)
4683 return error_mark_node;
4684 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), NULL_TREE, elt_init);
4690 /* Subroutine of reshape_init_r, processes the initializers for arrays.
4691 Parameters are the same of reshape_init_r. */
4694 reshape_init_array (tree type, reshape_iter *d)
4696 tree max_index = NULL_TREE;
4698 gcc_assert (TREE_CODE (type) == ARRAY_TYPE);
4700 if (TYPE_DOMAIN (type))
4701 max_index = array_type_nelts (type);
4703 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4706 /* Subroutine of reshape_init_r, processes the initializers for vectors.
4707 Parameters are the same of reshape_init_r. */
4710 reshape_init_vector (tree type, reshape_iter *d)
4712 tree max_index = NULL_TREE;
4715 gcc_assert (TREE_CODE (type) == VECTOR_TYPE);
4717 if (COMPOUND_LITERAL_P (d->cur->value))
4719 tree value = d->cur->value;
4720 if (!same_type_p (TREE_TYPE (value), type))
4722 error ("invalid type %qT as initializer for a vector of type %qT",
4723 TREE_TYPE (d->cur->value), type);
4724 value = error_mark_node;
4730 /* For a vector, the representation type is a struct
4731 containing a single member which is an array of the
4732 appropriate size. */
4733 rtype = TYPE_DEBUG_REPRESENTATION_TYPE (type);
4734 if (rtype && TYPE_DOMAIN (TREE_TYPE (TYPE_FIELDS (rtype))))
4735 max_index = array_type_nelts (TREE_TYPE (TYPE_FIELDS (rtype)));
4737 return reshape_init_array_1 (TREE_TYPE (type), max_index, d);
4740 /* Subroutine of reshape_init_r, processes the initializers for classes
4741 or union. Parameters are the same of reshape_init_r. */
4744 reshape_init_class (tree type, reshape_iter *d, bool first_initializer_p)
4749 gcc_assert (CLASS_TYPE_P (type));
4751 /* The initializer for a class is always a CONSTRUCTOR. */
4752 new_init = build_constructor (init_list_type_node, NULL);
4753 field = next_initializable_field (TYPE_FIELDS (type));
4759 An initializer for an aggregate member that is an
4760 empty class shall have the form of an empty
4761 initializer-list {}. */
4762 if (!first_initializer_p)
4764 error ("initializer for %qT must be brace-enclosed", type);
4765 return error_mark_node;
4770 /* Loop through the initializable fields, gathering initializers. */
4771 while (d->cur != d->end)
4775 /* Handle designated initializers, as an extension. */
4778 field = lookup_field_1 (type, d->cur->index, /*want_type=*/false);
4780 if (!field || TREE_CODE (field) != FIELD_DECL)
4782 error ("%qT has no non-static data member named %qD", type,
4784 return error_mark_node;
4788 /* If we processed all the member of the class, we are done. */
4792 field_init = reshape_init_r (TREE_TYPE (field), d,
4793 /*first_initializer_p=*/false);
4794 CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (new_init), field, field_init);
4798 When a union is initialized with a brace-enclosed
4799 initializer, the braces shall only contain an
4800 initializer for the first member of the union. */
4801 if (TREE_CODE (type) == UNION_TYPE)
4804 field = next_initializable_field (TREE_CHAIN (field));
4810 /* Subroutine of reshape_init, which processes a single initializer (part of
4811 a CONSTRUCTOR). TYPE is the type of the variable being initialized, D is the
4812 iterator within the CONSTRUCTOR which points to the initializer to process.
4813 FIRST_INITIALIZER_P is true if this is the first initializer of the
4814 CONSTRUCTOR node. */
4817 reshape_init_r (tree type, reshape_iter *d, bool first_initializer_p)
4819 tree init = d->cur->value;
4821 if (error_operand_p (init))
4822 return error_mark_node;
4824 /* A non-aggregate type is always initialized with a single
4826 if (!CP_AGGREGATE_TYPE_P (type))
4828 /* It is invalid to initialize a non-aggregate type with a
4829 brace-enclosed initializer before C++0x.
4830 We need to check for BRACE_ENCLOSED_INITIALIZER_P here because
4831 of g++.old-deja/g++.mike/p7626.C: a pointer-to-member constant is
4832 a CONSTRUCTOR (with a record type). */
4833 if (TREE_CODE (init) == CONSTRUCTOR
4834 && BRACE_ENCLOSED_INITIALIZER_P (init)) /* p7626.C */
4836 if (SCALAR_TYPE_P (type))
4838 error ("braces around scalar initializer for type %qT", type);
4839 init = error_mark_node;
4842 maybe_warn_cpp0x ("extended initializer lists");
4851 All implicit type conversions (clause _conv_) are considered when
4852 initializing the aggregate member with an initializer from an
4853 initializer-list. If the initializer can initialize a member,
4854 the member is initialized. Otherwise, if the member is itself a
4855 non-empty subaggregate, brace elision is assumed and the
4856 initializer is considered for the initialization of the first
4857 member of the subaggregate. */
4858 if (TREE_CODE (init) != CONSTRUCTOR
4859 && can_convert_arg (type, TREE_TYPE (init), init, LOOKUP_NORMAL))
4865 /* [dcl.init.string]
4867 A char array (whether plain char, signed char, or unsigned char)
4868 can be initialized by a string-literal (optionally enclosed in
4869 braces); a wchar_t array can be initialized by a wide
4870 string-literal (optionally enclosed in braces). */
4871 if (TREE_CODE (type) == ARRAY_TYPE
4872 && char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (type))))
4874 tree str_init = init;
4876 /* Strip one level of braces if and only if they enclose a single
4877 element (as allowed by [dcl.init.string]). */
4878 if (!first_initializer_p
4879 && TREE_CODE (str_init) == CONSTRUCTOR
4880 && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (str_init)) == 1)
4882 str_init = VEC_index (constructor_elt,
4883 CONSTRUCTOR_ELTS (str_init), 0)->value;
4886 /* If it's a string literal, then it's the initializer for the array
4887 as a whole. Otherwise, continue with normal initialization for
4888 array types (one value per array element). */
4889 if (TREE_CODE (str_init) == STRING_CST)
4896 /* The following cases are about aggregates. If we are not within a full
4897 initializer already, and there is not a CONSTRUCTOR, it means that there
4898 is a missing set of braces (that is, we are processing the case for
4899 which reshape_init exists). */
4900 if (!first_initializer_p)
4902 if (TREE_CODE (init) == CONSTRUCTOR)
4904 if (TREE_TYPE (init) && TYPE_PTRMEMFUNC_P (TREE_TYPE (init)))
4905 /* There is no need to reshape pointer-to-member function
4906 initializers, as they are always constructed correctly
4907 by the front end. */
4909 else if (COMPOUND_LITERAL_P (init))
4910 /* For a nested compound literal, there is no need to reshape since
4911 brace elision is not allowed. Even if we decided to allow it,
4912 we should add a call to reshape_init in finish_compound_literal,
4913 before calling digest_init, so changing this code would still
4914 not be necessary. */
4915 gcc_assert (!BRACE_ENCLOSED_INITIALIZER_P (init));
4919 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4920 return reshape_init (type, init);
4924 warning (OPT_Wmissing_braces, "missing braces around initializer for %qT",
4928 /* Dispatch to specialized routines. */
4929 if (CLASS_TYPE_P (type))
4930 return reshape_init_class (type, d, first_initializer_p);
4931 else if (TREE_CODE (type) == ARRAY_TYPE)
4932 return reshape_init_array (type, d);
4933 else if (TREE_CODE (type) == VECTOR_TYPE)
4934 return reshape_init_vector (type, d);
4939 /* Undo the brace-elision allowed by [dcl.init.aggr] in a
4940 brace-enclosed aggregate initializer.
4942 INIT is the CONSTRUCTOR containing the list of initializers describing
4943 a brace-enclosed initializer for an entity of the indicated aggregate TYPE.
4944 It may not presently match the shape of the TYPE; for example:
4946 struct S { int a; int b; };
4947 struct S a[] = { 1, 2, 3, 4 };
4949 Here INIT will hold a VEC of four elements, rather than a
4950 VEC of two elements, each itself a VEC of two elements. This
4951 routine transforms INIT from the former form into the latter. The
4952 revised CONSTRUCTOR node is returned. */
4955 reshape_init (tree type, tree init)
4957 VEC(constructor_elt, gc) *v;
4961 gcc_assert (BRACE_ENCLOSED_INITIALIZER_P (init));
4963 v = CONSTRUCTOR_ELTS (init);
4965 /* An empty constructor does not need reshaping, and it is always a valid
4967 if (VEC_empty (constructor_elt, v))
4970 /* Recurse on this CONSTRUCTOR. */
4971 d.cur = VEC_index (constructor_elt, v, 0);
4972 d.end = d.cur + VEC_length (constructor_elt, v);
4974 new_init = reshape_init_r (type, &d, true);
4975 if (new_init == error_mark_node)
4976 return error_mark_node;
4978 /* Make sure all the element of the constructor were used. Otherwise,
4979 issue an error about exceeding initializers. */
4981 error ("too many initializers for %qT", type);
4986 /* Verify array initializer. Returns true if errors have been reported. */
4989 check_array_initializer (tree decl, tree type, tree init)
4991 tree element_type = TREE_TYPE (type);
4993 /* The array type itself need not be complete, because the
4994 initializer may tell us how many elements are in the array.
4995 But, the elements of the array must be complete. */
4996 if (!COMPLETE_TYPE_P (complete_type (element_type)))
4999 error ("elements of array %q#D have incomplete type", decl);
5001 error ("elements of array %q#T have incomplete type", type);
5004 /* It is not valid to initialize a VLA. */
5006 && ((COMPLETE_TYPE_P (type) && !TREE_CONSTANT (TYPE_SIZE (type)))
5007 || !TREE_CONSTANT (TYPE_SIZE (element_type))))
5010 error ("variable-sized object %qD may not be initialized", decl);
5012 error ("variable-sized compound literal");
5018 /* Subroutine of check_initializer; args are passed down from that function.
5019 Set stmts_are_full_exprs_p to 1 across a call to build_aggr_init. */
5022 build_aggr_init_full_exprs (tree decl, tree init, int flags)
5025 int saved_stmts_are_full_exprs_p = 0;
5026 if (building_stmt_tree ())
5028 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5029 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5031 init = build_aggr_init (decl, init, flags, tf_warning_or_error);
5032 if (building_stmt_tree ())
5033 current_stmt_tree ()->stmts_are_full_exprs_p =
5034 saved_stmts_are_full_exprs_p;
5038 /* Verify INIT (the initializer for DECL), and record the
5039 initialization in DECL_INITIAL, if appropriate. CLEANUP is as for
5040 grok_reference_init.
5042 If the return value is non-NULL, it is an expression that must be
5043 evaluated dynamically to initialize DECL. */
5046 check_initializer (tree decl, tree init, int flags, tree *cleanup)
5048 tree type = TREE_TYPE (decl);
5049 tree init_code = NULL;
5051 /* Things that are going to be initialized need to have complete
5053 TREE_TYPE (decl) = type = complete_type (TREE_TYPE (decl));
5055 if (type == error_mark_node)
5056 /* We will have already complained. */
5059 if (TREE_CODE (type) == ARRAY_TYPE)
5061 if (check_array_initializer (decl, type, init))
5064 else if (!COMPLETE_TYPE_P (type))
5066 error ("%qD has incomplete type", decl);
5067 TREE_TYPE (decl) = error_mark_node;
5071 /* There is no way to make a variable-sized class type in GNU C++. */
5072 gcc_assert (TREE_CONSTANT (TYPE_SIZE (type)));
5074 if (init && BRACE_ENCLOSED_INITIALIZER_P (init))
5076 int init_len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (init));
5077 if (SCALAR_TYPE_P (type))
5081 maybe_warn_cpp0x ("extended initializer lists");
5082 init = build_zero_init (type, NULL_TREE, false);
5084 else if (init_len != 1)
5086 error ("scalar object %qD requires one element in initializer",
5088 TREE_TYPE (decl) = error_mark_node;
5094 if (TREE_CODE (decl) == CONST_DECL)
5096 gcc_assert (TREE_CODE (type) != REFERENCE_TYPE);
5098 DECL_INITIAL (decl) = init;
5100 gcc_assert (init != NULL_TREE);
5103 else if (!DECL_EXTERNAL (decl) && TREE_CODE (type) == REFERENCE_TYPE)
5104 init = grok_reference_init (decl, type, init, cleanup);
5107 /* Do not reshape constructors of vectors (they don't need to be
5109 if (BRACE_ENCLOSED_INITIALIZER_P (init))
5111 if (is_std_init_list (type))
5112 return build_init_list_var_init (decl, type, init, cleanup);
5113 else if (TYPE_NON_AGGREGATE_CLASS (type))
5115 /* Don't reshape if the class has constructors. */
5116 if (cxx_dialect == cxx98)
5117 error ("in C++98 %qD must be initialized by constructor, "
5120 init = build_tree_list (NULL_TREE, init);
5122 else if ((*targetm.vector_opaque_p) (type))
5124 error ("opaque vector types cannot be initialized");
5125 init = error_mark_node;
5128 init = reshape_init (type, init);
5131 /* If DECL has an array type without a specific bound, deduce the
5132 array size from the initializer. */
5133 maybe_deduce_size_from_array_init (decl, init);
5134 type = TREE_TYPE (decl);
5135 if (type == error_mark_node)
5138 if (TYPE_NEEDS_CONSTRUCTING (type)
5139 || (CLASS_TYPE_P (type)
5140 && !BRACE_ENCLOSED_INITIALIZER_P (init)))
5141 return build_aggr_init_full_exprs (decl, init, flags);
5142 else if (TREE_CODE (init) != TREE_VEC)
5144 init_code = store_init_value (decl, init);
5145 if (pedantic && TREE_CODE (type) == ARRAY_TYPE
5146 && DECL_INITIAL (decl)
5147 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
5148 && PAREN_STRING_LITERAL_P (DECL_INITIAL (decl)))
5149 warning (0, "array %qD initialized by parenthesized string literal %qE",
5150 decl, DECL_INITIAL (decl));
5154 else if (DECL_EXTERNAL (decl))
5156 else if (TYPE_P (type) && TYPE_NEEDS_CONSTRUCTING (type))
5157 return build_aggr_init_full_exprs (decl, init, flags);
5158 else if (MAYBE_CLASS_TYPE_P (type))
5160 tree core_type = strip_array_types (type);
5162 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (core_type))
5163 error ("structure %qD with uninitialized const members", decl);
5164 if (CLASSTYPE_REF_FIELDS_NEED_INIT (core_type))
5165 error ("structure %qD with uninitialized reference members", decl);
5167 check_for_uninitialized_const_var (decl);
5170 check_for_uninitialized_const_var (decl);
5172 if (init && init != error_mark_node)
5173 init_code = build2 (INIT_EXPR, type, decl, init);
5178 /* If DECL is not a local variable, give it RTL. */
5181 make_rtl_for_nonlocal_decl (tree decl, tree init, const char* asmspec)
5183 int toplev = toplevel_bindings_p ();
5185 const char *filename;
5187 /* Set the DECL_ASSEMBLER_NAME for the object. */
5190 /* The `register' keyword, when used together with an
5191 asm-specification, indicates that the variable should be
5192 placed in a particular register. */
5193 if (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
5195 set_user_assembler_name (decl, asmspec);
5196 DECL_HARD_REGISTER (decl) = 1;
5200 if (TREE_CODE (decl) == FUNCTION_DECL
5201 && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
5202 set_builtin_user_assembler_name (decl, asmspec);
5203 set_user_assembler_name (decl, asmspec);
5207 /* Handle non-variables up front. */
5208 if (TREE_CODE (decl) != VAR_DECL)
5210 rest_of_decl_compilation (decl, toplev, at_eof);
5214 /* If we see a class member here, it should be a static data
5216 if (DECL_LANG_SPECIFIC (decl) && DECL_IN_AGGR_P (decl))
5218 gcc_assert (TREE_STATIC (decl));
5219 /* An in-class declaration of a static data member should be
5220 external; it is only a declaration, and not a definition. */
5221 if (init == NULL_TREE)
5222 gcc_assert (DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl));
5225 /* We don't create any RTL for local variables. */
5226 if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5229 /* We defer emission of local statics until the corresponding
5230 DECL_EXPR is expanded. */
5231 defer_p = DECL_FUNCTION_SCOPE_P (decl) || DECL_VIRTUAL_P (decl);
5233 /* We try to defer namespace-scope static constants so that they are
5234 not emitted into the object file unnecessarily. */
5235 filename = input_filename;
5236 if (!DECL_VIRTUAL_P (decl)
5237 && TREE_READONLY (decl)
5238 && DECL_INITIAL (decl) != NULL_TREE
5239 && DECL_INITIAL (decl) != error_mark_node
5241 && ! EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))
5243 && !TREE_PUBLIC (decl))
5245 /* Fool with the linkage of static consts according to #pragma
5247 struct c_fileinfo *finfo = get_fileinfo (filename);
5248 if (!finfo->interface_unknown && !TREE_PUBLIC (decl))
5250 TREE_PUBLIC (decl) = 1;
5251 DECL_EXTERNAL (decl) = finfo->interface_only;
5256 /* Likewise for template instantiations. */
5257 else if (DECL_LANG_SPECIFIC (decl)
5258 && DECL_IMPLICIT_INSTANTIATION (decl))
5261 /* If we're not deferring, go ahead and assemble the variable. */
5263 rest_of_decl_compilation (decl, toplev, at_eof);
5266 /* walk_tree helper for wrap_temporary_cleanups, below. */
5269 wrap_cleanups_r (tree *stmt_p, int *walk_subtrees, void *data)
5271 if (TYPE_P (*stmt_p))
5277 if (TREE_CODE (*stmt_p) == TARGET_EXPR)
5279 tree guard = (tree)data;
5280 tree tcleanup = TARGET_EXPR_CLEANUP (*stmt_p);
5282 tcleanup = build2 (TRY_CATCH_EXPR, void_type_node, tcleanup, guard);
5283 /* Tell honor_protect_cleanup_actions to handle this as a separate
5285 TRY_CATCH_IS_CLEANUP (tcleanup) = 1;
5287 TARGET_EXPR_CLEANUP (*stmt_p) = tcleanup;
5293 /* We're initializing a local variable which has a cleanup GUARD. If there
5294 are any temporaries used in the initializer INIT of this variable, we
5295 need to wrap their cleanups with TRY_CATCH_EXPR (, GUARD) so that the
5296 variable will be cleaned up properly if one of them throws.
5298 Unfortunately, there's no way to express this properly in terms of
5299 nesting, as the regions for the temporaries overlap the region for the
5300 variable itself; if there are two temporaries, the variable needs to be
5301 the first thing destroyed if either of them throws. However, we only
5302 want to run the variable's cleanup if it actually got constructed. So
5303 we need to guard the temporary cleanups with the variable's cleanup if
5304 they are run on the normal path, but not if they are run on the
5305 exceptional path. We implement this by telling
5306 honor_protect_cleanup_actions to strip the variable cleanup from the
5307 exceptional path. */
5310 wrap_temporary_cleanups (tree init, tree guard)
5312 cp_walk_tree_without_duplicates (&init, wrap_cleanups_r, (void *)guard);
5315 /* Generate code to initialize DECL (a local variable). */
5318 initialize_local_var (tree decl, tree init)
5320 tree type = TREE_TYPE (decl);
5324 gcc_assert (TREE_CODE (decl) == VAR_DECL
5325 || TREE_CODE (decl) == RESULT_DECL);
5326 gcc_assert (!TREE_STATIC (decl));
5328 if (DECL_SIZE (decl) == NULL_TREE)
5330 /* If we used it already as memory, it must stay in memory. */
5331 DECL_INITIAL (decl) = NULL_TREE;
5332 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
5336 if (type == error_mark_node)
5339 /* Compute and store the initial value. */
5340 already_used = TREE_USED (decl) || TREE_USED (type);
5342 /* Generate a cleanup, if necessary. */
5343 cleanup = cxx_maybe_build_cleanup (decl);
5345 /* Perform the initialization. */
5348 int saved_stmts_are_full_exprs_p;
5350 /* If we're only initializing a single object, guard the destructors
5351 of any temporaries used in its initializer with its destructor.
5352 This isn't right for arrays because each element initialization is
5353 a full-expression. */
5354 if (cleanup && TREE_CODE (type) != ARRAY_TYPE)
5355 wrap_temporary_cleanups (init, cleanup);
5357 gcc_assert (building_stmt_tree ());
5358 saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
5359 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
5360 finish_expr_stmt (init);
5361 current_stmt_tree ()->stmts_are_full_exprs_p =
5362 saved_stmts_are_full_exprs_p;
5365 /* Set this to 0 so we can tell whether an aggregate which was
5366 initialized was ever used. Don't do this if it has a
5367 destructor, so we don't complain about the 'resource
5368 allocation is initialization' idiom. Now set
5369 attribute((unused)) on types so decls of that type will be
5370 marked used. (see TREE_USED, above.) */
5371 if (TYPE_NEEDS_CONSTRUCTING (type)
5373 && TYPE_HAS_TRIVIAL_DESTRUCTOR (type)
5374 && DECL_NAME (decl))
5375 TREE_USED (decl) = 0;
5376 else if (already_used)
5377 TREE_USED (decl) = 1;
5380 finish_decl_cleanup (decl, cleanup);
5383 /* DECL is a VAR_DECL for a compiler-generated variable with static
5384 storage duration (like a virtual table) whose initializer is a
5385 compile-time constant. INIT must be either a TREE_LIST of values,
5386 or a CONSTRUCTOR. Initialize the variable and provide it to the
5390 initialize_artificial_var (tree decl, tree init)
5392 gcc_assert (DECL_ARTIFICIAL (decl));
5393 if (TREE_CODE (init) == TREE_LIST)
5394 init = build_constructor_from_list (TREE_TYPE (decl), init);
5395 gcc_assert (TREE_CODE (init) == CONSTRUCTOR);
5396 DECL_INITIAL (decl) = init;
5397 DECL_INITIALIZED_P (decl) = 1;
5398 determine_visibility (decl);
5399 layout_var_decl (decl);
5400 maybe_commonize_var (decl);
5401 make_rtl_for_nonlocal_decl (decl, init, /*asmspec=*/NULL);
5404 /* INIT is the initializer for a variable, as represented by the
5405 parser. Returns true iff INIT is value-dependent. */
5408 value_dependent_init_p (tree init)
5410 if (TREE_CODE (init) == TREE_LIST)
5411 /* A parenthesized initializer, e.g.: int i (3, 2); ? */
5412 return any_value_dependent_elements_p (init);
5413 else if (TREE_CODE (init) == CONSTRUCTOR)
5414 /* A brace-enclosed initializer, e.g.: int i = { 3 }; ? */
5416 VEC(constructor_elt, gc) *elts;
5420 elts = CONSTRUCTOR_ELTS (init);
5421 nelts = VEC_length (constructor_elt, elts);
5422 for (i = 0; i < nelts; ++i)
5423 if (value_dependent_init_p (VEC_index (constructor_elt,
5428 /* It must be a simple expression, e.g., int i = 3; */
5429 return value_dependent_expression_p (init);
5434 /* Finish processing of a declaration;
5435 install its line number and initial value.
5436 If the length of an array type is not known before,
5437 it must be determined now, from the initial value, or it is an error.
5439 INIT is the initializer (if any) for DECL. If INIT_CONST_EXPR_P is
5440 true, then INIT is an integral constant expression.
5442 FLAGS is LOOKUP_ONLYCONVERTING if the = init syntax was used, else 0
5443 if the (init) syntax was used. */
5446 cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
5447 tree asmspec_tree, int flags)
5451 const char *asmspec = NULL;
5452 int was_readonly = 0;
5453 bool var_definition_p = false;
5454 int saved_processing_template_decl;
5457 if (decl == error_mark_node)
5462 error ("assignment (not initialization) in declaration");
5466 gcc_assert (TREE_CODE (decl) != RESULT_DECL);
5467 /* Parameters are handled by store_parm_decls, not cp_finish_decl. */
5468 gcc_assert (TREE_CODE (decl) != PARM_DECL);
5470 type = TREE_TYPE (decl);
5471 if (type == error_mark_node)
5474 /* Assume no cleanup is required. */
5475 cleanup = NULL_TREE;
5476 saved_processing_template_decl = processing_template_decl;
5478 /* If a name was specified, get the string. */
5479 if (global_scope_p (current_binding_level))
5480 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
5481 if (asmspec_tree && asmspec_tree != error_mark_node)
5482 asmspec = TREE_STRING_POINTER (asmspec_tree);
5484 if (current_class_type
5485 && CP_DECL_CONTEXT (decl) == current_class_type
5486 && TYPE_BEING_DEFINED (current_class_type)
5487 && (DECL_INITIAL (decl) || init))
5488 DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
5490 auto_node = type_uses_auto (type);
5493 if (init == NULL_TREE)
5495 error ("declaration of %q#D has no initializer", decl);
5496 TREE_TYPE (decl) = error_mark_node;
5499 else if (describable_type (init))
5501 type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
5502 if (type == error_mark_node)
5507 if (init && TREE_CODE (decl) == FUNCTION_DECL)
5509 if (init == ridpointers[(int)RID_DELETE])
5511 /* FIXME check this is 1st decl. */
5512 DECL_DELETED_FN (decl) = 1;
5513 DECL_DECLARED_INLINE_P (decl) = 1;
5514 DECL_INITIAL (decl) = error_mark_node;
5517 else if (init == ridpointers[(int)RID_DEFAULT])
5519 if (!defaultable_fn_p (decl))
5521 error ("%qD cannot be defaulted", decl);
5522 DECL_INITIAL (decl) = NULL_TREE;
5525 DECL_DEFAULTED_FN (decl) = 1;
5529 if (processing_template_decl)
5531 bool type_dependent_p;
5533 /* Add this declaration to the statement-tree. */
5534 if (at_function_scope_p ())
5535 add_decl_expr (decl);
5537 type_dependent_p = dependent_type_p (type);
5539 if (check_for_bare_parameter_packs (init))
5542 DECL_INITIAL (decl) = NULL_TREE;
5545 if (init && init_const_expr_p && TREE_CODE (decl) == VAR_DECL)
5547 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5548 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5549 TREE_CONSTANT (decl) = 1;
5552 /* Generally, initializers in templates are expanded when the
5553 template is instantiated. But, if DECL is an integral
5554 constant static data member, then it can be used in future
5555 integral constant expressions, and its value must be
5558 && DECL_CLASS_SCOPE_P (decl)
5559 && DECL_INTEGRAL_CONSTANT_VAR_P (decl)
5560 && !type_dependent_p
5561 && !value_dependent_init_p (init)))
5564 DECL_INITIAL (decl) = init;
5565 if (TREE_CODE (decl) == VAR_DECL
5566 && !DECL_PRETTY_FUNCTION_P (decl)
5567 && !type_dependent_p)
5568 maybe_deduce_size_from_array_init (decl, init);
5572 if (TREE_CODE (init) == TREE_LIST)
5574 /* If the parenthesized-initializer form was used (e.g.,
5575 "int A<N>::i(X)"), then INIT will be a TREE_LIST of initializer
5576 arguments. (There is generally only one.) We convert them
5579 for (; list; list = TREE_CHAIN (list))
5581 tree elt = TREE_VALUE (list);
5582 TREE_VALUE (list) = fold_non_dependent_expr (elt);
5586 init = fold_non_dependent_expr (init);
5587 processing_template_decl = 0;
5590 /* Take care of TYPE_DECLs up front. */
5591 if (TREE_CODE (decl) == TYPE_DECL)
5593 if (type != error_mark_node
5594 && MAYBE_CLASS_TYPE_P (type) && DECL_NAME (decl))
5596 if (TREE_TYPE (DECL_NAME (decl)) && TREE_TYPE (decl) != type)
5597 warning (0, "shadowing previous type declaration of %q#D", decl);
5598 set_identifier_type_value (DECL_NAME (decl), decl);
5601 /* If we have installed this as the canonical typedef for this
5602 type, and that type has not been defined yet, delay emitting
5603 the debug information for it, as we will emit it later. */
5604 if (TYPE_MAIN_DECL (TREE_TYPE (decl)) == decl
5605 && !COMPLETE_TYPE_P (TREE_TYPE (decl)))
5606 TYPE_DECL_SUPPRESS_DEBUG (decl) = 1;
5608 rest_of_decl_compilation (decl, DECL_CONTEXT (decl) == NULL_TREE,
5613 /* A reference will be modified here, as it is initialized. */
5614 if (! DECL_EXTERNAL (decl)
5615 && TREE_READONLY (decl)
5616 && TREE_CODE (type) == REFERENCE_TYPE)
5619 TREE_READONLY (decl) = 0;
5622 if (TREE_CODE (decl) == VAR_DECL)
5624 /* Only PODs can have thread-local storage. Other types may require
5625 various kinds of non-trivial initialization. */
5626 if (DECL_THREAD_LOCAL_P (decl) && !pod_type_p (TREE_TYPE (decl)))
5627 error ("%qD cannot be thread-local because it has non-POD type %qT",
5628 decl, TREE_TYPE (decl));
5629 /* If this is a local variable that will need a mangled name,
5630 register it now. We must do this before processing the
5631 initializer for the variable, since the initialization might
5632 require a guard variable, and since the mangled name of the
5633 guard variable will depend on the mangled name of this
5635 if (DECL_FUNCTION_SCOPE_P (decl)
5636 && TREE_STATIC (decl)
5637 && !DECL_ARTIFICIAL (decl))
5638 push_local_name (decl);
5639 /* Convert the initializer to the type of DECL, if we have not
5640 already initialized DECL. */
5641 if (!DECL_INITIALIZED_P (decl)
5642 /* If !DECL_EXTERNAL then DECL is being defined. In the
5643 case of a static data member initialized inside the
5644 class-specifier, there can be an initializer even if DECL
5645 is *not* defined. */
5646 && (!DECL_EXTERNAL (decl) || init))
5648 if (TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5651 = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
5652 /* Allow libjava/prims.cc define primitive classes. */
5653 if (init != NULL_TREE
5654 || jclass == NULL_TREE
5655 || TREE_CODE (jclass) != TYPE_DECL
5656 || !POINTER_TYPE_P (TREE_TYPE (jclass))
5657 || !same_type_ignoring_top_level_qualifiers_p
5658 (type, TREE_TYPE (TREE_TYPE (jclass))))
5659 error ("Java object %qD not allocated with %<new%>", decl);
5664 DECL_NONTRIVIALLY_INITIALIZED_P (decl) = 1;
5665 if (init_const_expr_p)
5667 DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1;
5668 if (DECL_INTEGRAL_CONSTANT_VAR_P (decl))
5669 TREE_CONSTANT (decl) = 1;
5672 init = check_initializer (decl, init, flags, &cleanup);
5673 /* Thread-local storage cannot be dynamically initialized. */
5674 if (DECL_THREAD_LOCAL_P (decl) && init)
5676 error ("%qD is thread-local and so cannot be dynamically "
5677 "initialized", decl);
5681 /* Check that the initializer for a static data member was a
5682 constant. Although we check in the parser that the
5683 initializer is an integral constant expression, we do not
5684 simplify division-by-zero at the point at which it
5685 occurs. Therefore, in:
5687 struct S { static const int i = 7 / 0; };
5689 we issue an error at this point. It would
5690 probably be better to forbid division by zero in
5691 integral constant expressions. */
5692 if (DECL_EXTERNAL (decl) && init)
5694 error ("%qD cannot be initialized by a non-constant expression"
5695 " when being declared", decl);
5696 DECL_INITIALIZED_IN_CLASS_P (decl) = 0;
5704 The memory occupied by any object of static storage
5705 duration is zero-initialized at program startup before
5706 any other initialization takes place.
5708 We cannot create an appropriate initializer until after
5709 the type of DECL is finalized. If DECL_INITIAL is set,
5710 then the DECL is statically initialized, and any
5711 necessary zero-initialization has already been performed. */
5712 if (TREE_STATIC (decl) && !DECL_INITIAL (decl))
5713 DECL_INITIAL (decl) = build_zero_init (TREE_TYPE (decl),
5714 /*nelts=*/NULL_TREE,
5715 /*static_storage_p=*/true);
5716 /* Remember that the initialization for this variable has
5718 DECL_INITIALIZED_P (decl) = 1;
5719 /* This declaration is the definition of this variable,
5720 unless we are initializing a static data member within
5721 the class specifier. */
5722 if (!DECL_EXTERNAL (decl))
5723 var_definition_p = true;
5725 /* If the variable has an array type, lay out the type, even if
5726 there is no initializer. It is valid to index through the
5727 array, and we must get TYPE_ALIGN set correctly on the array
5729 else if (TREE_CODE (type) == ARRAY_TYPE)
5732 else if (TREE_CODE (decl) == FIELD_DECL
5733 && TYPE_FOR_JAVA (type) && MAYBE_CLASS_TYPE_P (type))
5734 error ("non-static data member %qD has Java class type", decl);
5736 /* Add this declaration to the statement-tree. This needs to happen
5737 after the call to check_initializer so that the DECL_EXPR for a
5738 reference temp is added before the DECL_EXPR for the reference itself. */
5739 if (at_function_scope_p ())
5740 add_decl_expr (decl);
5742 /* Let the middle end know about variables and functions -- but not
5743 static data members in uninstantiated class templates. */
5744 if (!saved_processing_template_decl
5745 && (TREE_CODE (decl) == VAR_DECL
5746 || TREE_CODE (decl) == FUNCTION_DECL))
5748 if (TREE_CODE (decl) == VAR_DECL)
5750 layout_var_decl (decl);
5751 maybe_commonize_var (decl);
5754 /* This needs to happen after the linkage is set. */
5755 determine_visibility (decl);
5757 if (var_definition_p && TREE_STATIC (decl))
5759 /* If a TREE_READONLY variable needs initialization
5760 at runtime, it is no longer readonly and we need to
5761 avoid MEM_READONLY_P being set on RTL created for it. */
5764 if (TREE_READONLY (decl))
5765 TREE_READONLY (decl) = 0;
5768 else if (was_readonly)
5769 TREE_READONLY (decl) = 1;
5772 make_rtl_for_nonlocal_decl (decl, init, asmspec);
5774 /* Check for abstractness of the type. Notice that there is no
5775 need to strip array types here since the check for those types
5776 is already done within create_array_type_for_decl. */
5777 if (TREE_CODE (type) == FUNCTION_TYPE
5778 || TREE_CODE (type) == METHOD_TYPE)
5779 abstract_virtuals_error (decl, TREE_TYPE (type));
5781 abstract_virtuals_error (decl, type);
5783 if (TREE_TYPE (decl) == error_mark_node)
5784 /* No initialization required. */
5786 else if (TREE_CODE (decl) == FUNCTION_DECL)
5790 if (init == ridpointers[(int)RID_DEFAULT])
5792 /* An out-of-class default definition is defined at
5793 the point where it is explicitly defaulted. */
5794 if (DECL_INITIAL (decl) == error_mark_node)
5795 synthesize_method (decl);
5798 error ("function %q#D is initialized like a variable", decl);
5800 /* else no initialization required. */
5802 else if (DECL_EXTERNAL (decl)
5803 && ! (DECL_LANG_SPECIFIC (decl)
5804 && DECL_NOT_REALLY_EXTERN (decl)))
5807 DECL_INITIAL (decl) = init;
5809 /* A variable definition. */
5810 else if (DECL_FUNCTION_SCOPE_P (decl) && !TREE_STATIC (decl))
5811 /* Initialize the local variable. */
5812 initialize_local_var (decl, init);
5814 /* If a variable is defined, and then a subsequent
5815 definition with external linkage is encountered, we will
5816 get here twice for the same variable. We want to avoid
5817 calling expand_static_init more than once. For variables
5818 that are not static data members, we can call
5819 expand_static_init only when we actually process the
5820 initializer. It is not legal to redeclare a static data
5821 member, so this issue does not arise in that case. */
5822 else if (var_definition_p && TREE_STATIC (decl))
5823 expand_static_init (decl, init);
5826 /* If a CLEANUP_STMT was created to destroy a temporary bound to a
5827 reference, insert it in the statement-tree now. */
5829 push_cleanup (decl, cleanup, false);
5832 processing_template_decl = saved_processing_template_decl;
5835 TREE_READONLY (decl) = 1;
5837 /* If this was marked 'used', be sure it will be output. */
5838 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
5839 mark_decl_referenced (decl);
5842 /* This is here for a midend callback from c-common.c. */
5845 finish_decl (tree decl, tree init, tree asmspec_tree)
5847 cp_finish_decl (decl, init, /*init_const_expr_p=*/false, asmspec_tree, 0);
5850 /* Returns a declaration for a VAR_DECL as if:
5852 extern "C" TYPE NAME;
5854 had been seen. Used to create compiler-generated global
5858 declare_global_var (tree name, tree type)
5862 push_to_top_level ();
5863 decl = build_decl (VAR_DECL, name, type);
5864 TREE_PUBLIC (decl) = 1;
5865 DECL_EXTERNAL (decl) = 1;
5866 DECL_ARTIFICIAL (decl) = 1;
5867 /* If the user has explicitly declared this variable (perhaps
5868 because the code we are compiling is part of a low-level runtime
5869 library), then it is possible that our declaration will be merged
5870 with theirs by pushdecl. */
5871 decl = pushdecl (decl);
5872 finish_decl (decl, NULL_TREE, NULL_TREE);
5873 pop_from_top_level ();
5878 /* Returns the type for the argument to "__cxa_atexit" (or "atexit",
5879 if "__cxa_atexit" is not being used) corresponding to the function
5880 to be called when the program exits. */
5883 get_atexit_fn_ptr_type (void)
5888 if (!atexit_fn_ptr_type_node)
5890 if (flag_use_cxa_atexit
5891 && !targetm.cxx.use_atexit_for_cxa_atexit ())
5892 /* The parameter to "__cxa_atexit" is "void (*)(void *)". */
5893 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5895 /* The parameter to "atexit" is "void (*)(void)". */
5896 arg_types = void_list_node;
5898 fn_type = build_function_type (void_type_node, arg_types);
5899 atexit_fn_ptr_type_node = build_pointer_type (fn_type);
5902 return atexit_fn_ptr_type_node;
5905 /* Returns a pointer to the `atexit' function. Note that if
5906 FLAG_USE_CXA_ATEXIT is nonzero, then this will actually be the new
5907 `__cxa_atexit' function specified in the IA64 C++ ABI. */
5910 get_atexit_node (void)
5917 bool use_aeabi_atexit;
5922 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
5924 /* The declaration for `__cxa_atexit' is:
5926 int __cxa_atexit (void (*)(void *), void *, void *)
5928 We build up the argument types and then then function type
5931 use_aeabi_atexit = targetm.cxx.use_aeabi_atexit ();
5932 /* First, build the pointer-to-function type for the first
5934 fn_ptr_type = get_atexit_fn_ptr_type ();
5935 /* Then, build the rest of the argument types. */
5936 arg_types = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
5937 if (use_aeabi_atexit)
5939 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5940 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5944 arg_types = tree_cons (NULL_TREE, ptr_type_node, arg_types);
5945 arg_types = tree_cons (NULL_TREE, fn_ptr_type, arg_types);
5947 /* And the final __cxa_atexit type. */
5948 fn_type = build_function_type (integer_type_node, arg_types);
5949 fn_ptr_type = build_pointer_type (fn_type);
5950 if (use_aeabi_atexit)
5951 name = "__aeabi_atexit";
5953 name = "__cxa_atexit";
5957 /* The declaration for `atexit' is:
5959 int atexit (void (*)());
5961 We build up the argument types and then then function type
5963 fn_ptr_type = get_atexit_fn_ptr_type ();
5964 arg_types = tree_cons (NULL_TREE, fn_ptr_type, void_list_node);
5965 /* Build the final atexit type. */
5966 fn_type = build_function_type (integer_type_node, arg_types);
5970 /* Now, build the function declaration. */
5971 push_lang_context (lang_name_c);
5972 atexit_fndecl = build_library_fn_ptr (name, fn_type);
5973 mark_used (atexit_fndecl);
5974 pop_lang_context ();
5975 atexit_node = decay_conversion (atexit_fndecl);
5980 /* Returns the __dso_handle VAR_DECL. */
5983 get_dso_handle_node (void)
5985 if (dso_handle_node)
5986 return dso_handle_node;
5988 /* Declare the variable. */
5989 dso_handle_node = declare_global_var (get_identifier ("__dso_handle"),
5992 return dso_handle_node;
5995 /* Begin a new function with internal linkage whose job will be simply
5996 to destroy some particular variable. */
5998 static GTY(()) int start_cleanup_cnt;
6001 start_cleanup_fn (void)
6006 bool use_cxa_atexit = flag_use_cxa_atexit
6007 && !targetm.cxx.use_atexit_for_cxa_atexit ();
6009 push_to_top_level ();
6011 /* No need to mangle this. */
6012 push_lang_context (lang_name_c);
6014 /* Build the name of the function. */
6015 sprintf (name, "__tcf_%d", start_cleanup_cnt++);
6016 /* Build the function declaration. */
6017 fntype = TREE_TYPE (get_atexit_fn_ptr_type ());
6018 fndecl = build_lang_decl (FUNCTION_DECL, get_identifier (name), fntype);
6019 /* It's a function with internal linkage, generated by the
6021 TREE_PUBLIC (fndecl) = 0;
6022 DECL_ARTIFICIAL (fndecl) = 1;
6023 /* Make the function `inline' so that it is only emitted if it is
6024 actually needed. It is unlikely that it will be inlined, since
6025 it is only called via a function pointer, but we avoid unnecessary
6026 emissions this way. */
6027 DECL_DECLARED_INLINE_P (fndecl) = 1;
6028 DECL_INTERFACE_KNOWN (fndecl) = 1;
6029 /* Build the parameter. */
6034 parmdecl = cp_build_parm_decl (NULL_TREE, ptr_type_node);
6035 DECL_CONTEXT (parmdecl) = fndecl;
6036 TREE_USED (parmdecl) = 1;
6037 DECL_ARGUMENTS (fndecl) = parmdecl;
6041 start_preparsed_function (fndecl, NULL_TREE, SF_PRE_PARSED);
6043 pop_lang_context ();
6045 return current_function_decl;
6048 /* Finish the cleanup function begun by start_cleanup_fn. */
6051 end_cleanup_fn (void)
6053 expand_or_defer_fn (finish_function (0));
6055 pop_from_top_level ();
6058 /* Generate code to handle the destruction of DECL, an object with
6059 static storage duration. */
6062 register_dtor_fn (tree decl)
6071 type = TREE_TYPE (decl);
6072 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
6073 return void_zero_node;
6075 /* If we're using "__cxa_atexit" (or "__aeabi_atexit"), and DECL is
6076 a class object, we can just pass the destructor to
6077 "__cxa_atexit"; we don't have to build a temporary function to do
6079 use_dtor = (flag_use_cxa_atexit
6080 && !targetm.cxx.use_atexit_for_cxa_atexit ()
6081 && CLASS_TYPE_P (type));
6086 /* Find the destructor. */
6087 idx = lookup_fnfields_1 (type, complete_dtor_identifier);
6088 gcc_assert (idx >= 0);
6089 cleanup = VEC_index (tree, CLASSTYPE_METHOD_VEC (type), idx);
6090 /* Make sure it is accessible. */
6091 perform_or_defer_access_check (TYPE_BINFO (type), cleanup, cleanup);
6095 /* Call build_cleanup before we enter the anonymous function so
6096 that any access checks will be done relative to the current
6097 scope, rather than the scope of the anonymous function. */
6098 build_cleanup (decl);
6100 /* Now start the function. */
6101 cleanup = start_cleanup_fn ();
6103 /* Now, recompute the cleanup. It may contain SAVE_EXPRs that refer
6104 to the original function, rather than the anonymous one. That
6105 will make the back end think that nested functions are in use,
6106 which causes confusion. */
6107 push_deferring_access_checks (dk_no_check);
6108 fcall = build_cleanup (decl);
6109 pop_deferring_access_checks ();
6111 /* Create the body of the anonymous function. */
6112 compound_stmt = begin_compound_stmt (BCS_FN_BODY);
6113 finish_expr_stmt (fcall);
6114 finish_compound_stmt (compound_stmt);
6118 /* Call atexit with the cleanup function. */
6119 mark_used (cleanup);
6120 cleanup = build_address (cleanup);
6121 if (flag_use_cxa_atexit && !targetm.cxx.use_atexit_for_cxa_atexit ())
6127 /* We must convert CLEANUP to the type that "__cxa_atexit"
6129 cleanup = build_nop (get_atexit_fn_ptr_type (), cleanup);
6130 /* "__cxa_atexit" will pass the address of DECL to the
6131 cleanup function. */
6133 addr = build_address (decl);
6134 /* The declared type of the parameter to "__cxa_atexit" is
6135 "void *". For plain "T*", we could just let the
6136 machinery in cp_build_function_call convert it -- but if the
6137 type is "cv-qualified T *", then we need to convert it
6138 before passing it in, to avoid spurious errors. */
6139 addr = build_nop (ptr_type_node, addr);
6142 /* Since the cleanup functions we build ignore the address
6143 they're given, there's no reason to pass the actual address
6144 in, and, in general, it's cheaper to pass NULL than any
6146 addr = null_pointer_node;
6147 args = tree_cons (NULL_TREE,
6148 cp_build_unary_op (ADDR_EXPR, get_dso_handle_node (), 0,
6149 tf_warning_or_error),
6151 if (targetm.cxx.use_aeabi_atexit ())
6153 args = tree_cons (NULL_TREE, cleanup, args);
6154 args = tree_cons (NULL_TREE, addr, args);
6158 args = tree_cons (NULL_TREE, addr, args);
6159 args = tree_cons (NULL_TREE, cleanup, args);
6163 args = tree_cons (NULL_TREE, cleanup, NULL_TREE);
6164 return cp_build_function_call (get_atexit_node (), args,
6165 tf_warning_or_error);
6168 /* DECL is a VAR_DECL with static storage duration. INIT, if present,
6169 is its initializer. Generate code to handle the construction
6170 and destruction of DECL. */
6173 expand_static_init (tree decl, tree init)
6175 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6176 gcc_assert (TREE_STATIC (decl));
6178 /* Some variables require no initialization. */
6180 && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))
6181 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
6184 if (DECL_FUNCTION_SCOPE_P (decl))
6186 /* Emit code to perform this initialization but once. */
6187 tree if_stmt = NULL_TREE, inner_if_stmt = NULL_TREE;
6188 tree then_clause = NULL_TREE, inner_then_clause = NULL_TREE;
6189 tree guard, guard_addr;
6190 tree acquire_fn, release_fn, abort_fn;
6193 /* Emit code to perform this initialization but once. This code
6196 static <type> guard;
6197 if (!guard.first_byte) {
6198 if (__cxa_guard_acquire (&guard)) {
6201 // Do initialization.
6202 flag = true; __cxa_guard_release (&guard);
6203 // Register variable for destruction at end of program.
6205 if (!flag) __cxa_guard_abort (&guard);
6209 Note that the `flag' variable is only set to 1 *after* the
6210 initialization is complete. This ensures that an exception,
6211 thrown during the construction, will cause the variable to
6212 reinitialized when we pass through this code again, as per:
6216 If the initialization exits by throwing an exception, the
6217 initialization is not complete, so it will be tried again
6218 the next time control enters the declaration.
6220 This process should be thread-safe, too; multiple threads
6221 should not be able to initialize the variable more than
6224 /* Create the guard variable. */
6225 guard = get_guard (decl);
6227 /* This optimization isn't safe on targets with relaxed memory
6228 consistency. On such targets we force synchronization in
6229 __cxa_guard_acquire. */
6230 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6232 /* Begin the conditional initialization. */
6233 if_stmt = begin_if_stmt ();
6234 finish_if_stmt_cond (get_guard_cond (guard), if_stmt);
6235 then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6238 if (flag_threadsafe_statics)
6240 guard_addr = build_address (guard);
6242 acquire_fn = get_identifier ("__cxa_guard_acquire");
6243 release_fn = get_identifier ("__cxa_guard_release");
6244 abort_fn = get_identifier ("__cxa_guard_abort");
6245 if (!get_global_value_if_present (acquire_fn, &acquire_fn))
6247 tree argtypes = tree_cons (NULL_TREE, TREE_TYPE (guard_addr),
6249 tree vfntype = build_function_type (void_type_node, argtypes);
6250 acquire_fn = push_library_fn
6251 (acquire_fn, build_function_type (integer_type_node, argtypes),
6253 release_fn = push_library_fn (release_fn, vfntype, NULL_TREE);
6254 abort_fn = push_library_fn (abort_fn, vfntype, NULL_TREE);
6258 release_fn = identifier_global_value (release_fn);
6259 abort_fn = identifier_global_value (abort_fn);
6262 inner_if_stmt = begin_if_stmt ();
6263 finish_if_stmt_cond (build_call_n (acquire_fn, 1, guard_addr),
6266 inner_then_clause = begin_compound_stmt (BCS_NO_SCOPE);
6267 begin = get_target_expr (boolean_false_node);
6268 flag = TARGET_EXPR_SLOT (begin);
6270 TARGET_EXPR_CLEANUP (begin)
6271 = build3 (COND_EXPR, void_type_node, flag,
6273 build_call_n (abort_fn, 1, guard_addr));
6274 CLEANUP_EH_ONLY (begin) = 1;
6276 /* Do the initialization itself. */
6277 init = add_stmt_to_compound (begin, init);
6278 init = add_stmt_to_compound
6279 (init, build2 (MODIFY_EXPR, void_type_node, flag, boolean_true_node));
6280 init = add_stmt_to_compound
6281 (init, build_call_n (release_fn, 1, guard_addr));
6284 init = add_stmt_to_compound (init, set_guard (guard));
6286 /* Use atexit to register a function for destroying this static
6288 init = add_stmt_to_compound (init, register_dtor_fn (decl));
6290 finish_expr_stmt (init);
6292 if (flag_threadsafe_statics)
6294 finish_compound_stmt (inner_then_clause);
6295 finish_then_clause (inner_if_stmt);
6296 finish_if_stmt (inner_if_stmt);
6299 if (!targetm.relaxed_ordering || !flag_threadsafe_statics)
6301 finish_compound_stmt (then_clause);
6302 finish_then_clause (if_stmt);
6303 finish_if_stmt (if_stmt);
6307 static_aggregates = tree_cons (init, decl, static_aggregates);
6311 /* Make TYPE a complete type based on INITIAL_VALUE.
6312 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
6313 2 if there was no information (in which case assume 0 if DO_DEFAULT),
6314 3 if the initializer list is empty (in pedantic mode). */
6317 cp_complete_array_type (tree *ptype, tree initial_value, bool do_default)
6320 tree type, elt_type;
6324 unsigned HOST_WIDE_INT i;
6327 /* An array of character type can be initialized from a
6328 brace-enclosed string constant.
6330 FIXME: this code is duplicated from reshape_init. Probably
6331 we should just call reshape_init here? */
6332 if (char_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (*ptype)))
6333 && TREE_CODE (initial_value) == CONSTRUCTOR
6334 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (initial_value)))
6336 VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (initial_value);
6337 tree value = VEC_index (constructor_elt, v, 0)->value;
6339 if (TREE_CODE (value) == STRING_CST
6340 && VEC_length (constructor_elt, v) == 1)
6341 initial_value = value;
6344 /* If any of the elements are parameter packs, we can't actually
6345 complete this type now because the array size is dependent. */
6346 if (TREE_CODE (initial_value) == CONSTRUCTOR)
6348 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (initial_value),
6351 if (PACK_EXPANSION_P (value))
6357 failure = complete_array_type (ptype, initial_value, do_default);
6359 /* We can create the array before the element type is complete, which
6360 means that we didn't have these two bits set in the original type
6361 either. In completing the type, we are expected to propagate these
6362 bits. See also complete_type which does the same thing for arrays
6365 if (TYPE_DOMAIN (type))
6367 elt_type = TREE_TYPE (type);
6368 TYPE_NEEDS_CONSTRUCTING (type) = TYPE_NEEDS_CONSTRUCTING (elt_type);
6369 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
6370 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (elt_type);
6376 /* Return zero if something is declared to be a member of type
6377 CTYPE when in the context of CUR_TYPE. STRING is the error
6378 message to print in that case. Otherwise, quietly return 1. */
6381 member_function_or_else (tree ctype, tree cur_type, enum overload_flags flags)
6383 if (ctype && ctype != cur_type)
6385 if (flags == DTOR_FLAG)
6386 error ("destructor for alien class %qT cannot be a member", ctype);
6388 error ("constructor for alien class %qT cannot be a member", ctype);
6394 /* Subroutine of `grokdeclarator'. */
6396 /* Generate errors possibly applicable for a given set of specifiers.
6397 This is for ARM $7.1.2. */
6400 bad_specifiers (tree object,
6409 error ("%qD declared as a %<virtual%> %s", object, type);
6411 error ("%qD declared as an %<inline%> %s", object, type);
6413 error ("%<const%> and %<volatile%> function specifiers on "
6414 "%qD invalid in %s declaration",
6417 error ("%q+D declared as a friend", object);
6419 && (TREE_CODE (object) == TYPE_DECL
6420 || (!TYPE_PTRFN_P (TREE_TYPE (object))
6421 && !TYPE_REFFN_P (TREE_TYPE (object))
6422 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (object)))))
6423 error ("%q+D declared with an exception specification", object);
6426 /* DECL is a member function or static data member and is presently
6427 being defined. Check that the definition is taking place in a
6431 check_class_member_definition_namespace (tree decl)
6433 /* These checks only apply to member functions and static data
6435 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
6436 || TREE_CODE (decl) == VAR_DECL);
6437 /* We check for problems with specializations in pt.c in
6438 check_specialization_namespace, where we can issue better
6440 if (processing_specialization)
6442 /* There are no restrictions on the placement of
6443 explicit instantiations. */
6444 if (processing_explicit_instantiation)
6448 A member function definition that appears outside of the
6449 class definition shall appear in a namespace scope enclosing
6450 the class definition.
6454 The definition for a static data member shall appear in a
6455 namespace scope enclosing the member's class definition. */
6456 if (!is_ancestor (current_namespace, DECL_CONTEXT (decl)))
6457 permerror (input_location, "definition of %qD is not in namespace enclosing %qT",
6458 decl, DECL_CONTEXT (decl));
6461 /* Build a PARM_DECL for the "this" parameter. TYPE is the
6462 METHOD_TYPE for a non-static member function; QUALS are the
6463 cv-qualifiers that apply to the function. */
6466 build_this_parm (tree type, cp_cv_quals quals)
6471 cp_cv_quals this_quals;
6473 this_type = TREE_VALUE (TYPE_ARG_TYPES (type));
6474 /* The `this' parameter is implicitly `const'; it cannot be
6476 this_quals = (quals & TYPE_QUAL_RESTRICT) | TYPE_QUAL_CONST;
6477 qual_type = cp_build_qualified_type (this_type, this_quals);
6478 parm = build_artificial_parm (this_identifier, qual_type);
6479 cp_apply_type_quals_to_decl (this_quals, parm);
6483 /* CTYPE is class type, or null if non-class.
6484 TYPE is type this FUNCTION_DECL should have, either FUNCTION_TYPE
6486 DECLARATOR is the function's name.
6487 PARMS is a chain of PARM_DECLs for the function.
6488 VIRTUALP is truthvalue of whether the function is virtual or not.
6489 FLAGS are to be passed through to `grokclassfn'.
6490 QUALS are qualifiers indicating whether the function is `const'
6492 RAISES is a list of exceptions that this function can raise.
6493 CHECK is 1 if we must find this method in CTYPE, 0 if we should
6494 not look, and -1 if we should not call `grokclassfn' at all.
6496 SFK is the kind of special function (if any) for the new function.
6498 Returns `NULL_TREE' if something goes wrong, after issuing
6499 applicable error messages. */
6502 grokfndecl (tree ctype,
6506 tree orig_declarator,
6508 enum overload_flags flags,
6515 special_function_kind sfk,
6520 location_t location)
6523 int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
6527 type = build_exception_variant (type, raises);
6529 decl = build_lang_decl (FUNCTION_DECL, declarator, type);
6531 /* If we have an explicit location, use it, otherwise use whatever
6532 build_lang_decl used (probably input_location). */
6533 if (location != UNKNOWN_LOCATION)
6534 DECL_SOURCE_LOCATION (decl) = location;
6536 if (TREE_CODE (type) == METHOD_TYPE)
6539 parm = build_this_parm (type, quals);
6540 TREE_CHAIN (parm) = parms;
6543 DECL_ARGUMENTS (decl) = parms;
6544 /* Propagate volatile out from type to decl. */
6545 if (TYPE_VOLATILE (type))
6546 TREE_THIS_VOLATILE (decl) = 1;
6548 /* Setup decl according to sfk. */
6551 case sfk_constructor:
6552 case sfk_copy_constructor:
6553 DECL_CONSTRUCTOR_P (decl) = 1;
6555 case sfk_destructor:
6556 DECL_DESTRUCTOR_P (decl) = 1;
6562 /* If pointers to member functions use the least significant bit to
6563 indicate whether a function is virtual, ensure a pointer
6564 to this function will have that bit clear. */
6565 if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn
6566 && TREE_CODE (type) == METHOD_TYPE
6567 && DECL_ALIGN (decl) < 2 * BITS_PER_UNIT)
6568 DECL_ALIGN (decl) = 2 * BITS_PER_UNIT;
6571 && TREE_CODE (orig_declarator) == TEMPLATE_ID_EXPR)
6575 ("defining explicit specialization %qD in friend declaration",
6579 tree fns = TREE_OPERAND (orig_declarator, 0);
6580 tree args = TREE_OPERAND (orig_declarator, 1);
6582 if (PROCESSING_REAL_TEMPLATE_DECL_P ())
6584 /* Something like `template <class T> friend void f<T>()'. */
6585 error ("invalid use of template-id %qD in declaration "
6586 "of primary template",
6592 /* A friend declaration of the form friend void f<>(). Record
6593 the information in the TEMPLATE_ID_EXPR. */
6594 SET_DECL_IMPLICIT_INSTANTIATION (decl);
6596 if (TREE_CODE (fns) == COMPONENT_REF)
6598 /* Due to bison parser ickiness, we will have already looked
6599 up an operator_name or PFUNCNAME within the current class
6600 (see template_id in parse.y). If the current class contains
6601 such a name, we'll get a COMPONENT_REF here. Undo that. */
6603 gcc_assert (TREE_TYPE (TREE_OPERAND (fns, 0))
6604 == current_class_type);
6605 fns = TREE_OPERAND (fns, 1);
6607 gcc_assert (TREE_CODE (fns) == IDENTIFIER_NODE
6608 || TREE_CODE (fns) == OVERLOAD);
6609 DECL_TEMPLATE_INFO (decl) = tree_cons (fns, args, NULL_TREE);
6611 for (t = TYPE_ARG_TYPES (TREE_TYPE (decl)); t; t = TREE_CHAIN (t))
6612 if (TREE_PURPOSE (t)
6613 && TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
6615 error ("default arguments are not allowed in declaration "
6616 "of friend template specialization %qD",
6623 error ("%<inline%> is not allowed in declaration of friend "
6624 "template specialization %qD",
6631 /* If this decl has namespace scope, set that up. */
6633 set_decl_namespace (decl, in_namespace, friendp);
6635 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
6637 /* `main' and builtins have implicit 'C' linkage. */
6638 if ((MAIN_NAME_P (declarator)
6639 || (IDENTIFIER_LENGTH (declarator) > 10
6640 && IDENTIFIER_POINTER (declarator)[0] == '_'
6641 && IDENTIFIER_POINTER (declarator)[1] == '_'
6642 && strncmp (IDENTIFIER_POINTER (declarator)+2, "builtin_", 8) == 0))
6643 && current_lang_name == lang_name_cplusplus
6644 && ctype == NULL_TREE
6645 /* NULL_TREE means global namespace. */
6646 && DECL_CONTEXT (decl) == NULL_TREE)
6647 SET_DECL_LANGUAGE (decl, lang_c);
6649 /* Should probably propagate const out from type to decl I bet (mrs). */
6652 DECL_STATIC_FUNCTION_P (decl) = 1;
6653 DECL_CONTEXT (decl) = ctype;
6658 DECL_CONTEXT (decl) = ctype;
6660 check_class_member_definition_namespace (decl);
6663 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6665 if (processing_template_decl)
6666 error ("cannot declare %<::main%> to be a template");
6668 error ("cannot declare %<::main%> to be inline");
6670 error ("cannot declare %<::main%> to be static");
6675 /* Members of anonymous types and local classes have no linkage; make
6676 them internal. If a typedef is made later, this will be changed. */
6677 if (ctype && (TYPE_ANONYMOUS_P (ctype)
6678 || decl_function_context (TYPE_MAIN_DECL (ctype))))
6683 /* [basic.link]: A name with no linkage (notably, the name of a class
6684 or enumeration declared in a local scope) shall not be used to
6685 declare an entity with linkage.
6687 Only check this for public decls for now. See core 319, 389. */
6688 t = no_linkage_check (TREE_TYPE (decl),
6689 /*relaxed_p=*/false);
6692 if (TYPE_ANONYMOUS_P (t))
6694 if (DECL_EXTERN_C_P (decl))
6695 /* Allow this; it's pretty common in C. */;
6698 permerror (input_location, "non-local function %q#D uses anonymous type",
6700 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6701 permerror (input_location, "%q+#D does not refer to the unqualified "
6702 "type, so it is not used for linkage",
6707 permerror (input_location, "non-local function %q#D uses local type %qT", decl, t);
6711 TREE_PUBLIC (decl) = publicp;
6714 DECL_INTERFACE_KNOWN (decl) = 1;
6715 DECL_NOT_REALLY_EXTERN (decl) = 1;
6718 /* If the declaration was declared inline, mark it as such. */
6720 DECL_DECLARED_INLINE_P (decl) = 1;
6722 DECL_EXTERNAL (decl) = 1;
6723 if (quals && TREE_CODE (type) == FUNCTION_TYPE)
6726 ? G_("static member function %qD cannot have cv-qualifier")
6727 : G_("non-member function %qD cannot have cv-qualifier"),
6729 quals = TYPE_UNQUALIFIED;
6732 if (IDENTIFIER_OPNAME_P (DECL_NAME (decl))
6733 && !grok_op_properties (decl, /*complain=*/true))
6736 if (ctype && decl_function_context (decl))
6737 DECL_NO_STATIC_CHAIN (decl) = 1;
6740 /* Make the init_value nonzero so pushdecl knows this is not
6741 tentative. error_mark_node is replaced later with the BLOCK. */
6742 DECL_INITIAL (decl) = error_mark_node;
6744 if (TYPE_NOTHROW_P (type) || nothrow_libfn_p (decl))
6745 TREE_NOTHROW (decl) = 1;
6747 /* Caller will do the rest of this. */
6751 if (ctype != NULL_TREE)
6752 grokclassfn (ctype, decl, flags);
6754 decl = check_explicit_specialization (orig_declarator, decl,
6757 4 * (friendp != 0));
6758 if (decl == error_mark_node)
6763 cplus_decl_attributes (&decl, *attrlist, 0);
6764 *attrlist = NULL_TREE;
6767 /* Check main's type after attributes have been applied. */
6768 if (ctype == NULL_TREE && DECL_MAIN_P (decl))
6770 if (!same_type_p (TREE_TYPE (TREE_TYPE (decl)),
6773 tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
6775 error ("%<::main%> must return %<int%>");
6776 newtype = build_function_type (integer_type_node, oldtypeargs);
6777 TREE_TYPE (decl) = newtype;
6780 check_main_parameter_types (decl);
6783 if (ctype != NULL_TREE
6784 && (! TYPE_FOR_JAVA (ctype) || check_java_method (decl))
6787 tree old_decl = check_classfn (ctype, decl,
6788 (processing_template_decl
6789 > template_class_depth (ctype))
6790 ? current_template_parms
6793 if (old_decl == error_mark_node)
6801 if (TREE_CODE (old_decl) == TEMPLATE_DECL)
6802 /* Because grokfndecl is always supposed to return a
6803 FUNCTION_DECL, we pull out the DECL_TEMPLATE_RESULT
6804 here. We depend on our callers to figure out that its
6805 really a template that's being returned. */
6806 old_decl = DECL_TEMPLATE_RESULT (old_decl);
6808 if (DECL_STATIC_FUNCTION_P (old_decl)
6809 && TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE)
6810 /* Remove the `this' parm added by grokclassfn.
6811 XXX Isn't this done in start_function, too? */
6812 revert_static_member_fn (decl);
6813 if (DECL_ARTIFICIAL (old_decl))
6815 error ("definition of implicitly-declared %qD", old_decl);
6819 /* Since we've smashed OLD_DECL to its
6820 DECL_TEMPLATE_RESULT, we must do the same to DECL. */
6821 if (TREE_CODE (decl) == TEMPLATE_DECL)
6822 decl = DECL_TEMPLATE_RESULT (decl);
6824 /* Attempt to merge the declarations. This can fail, in
6825 the case of some invalid specialization declarations. */
6826 pushed_scope = push_scope (ctype);
6827 ok = duplicate_decls (decl, old_decl, friendp);
6829 pop_scope (pushed_scope);
6832 error ("no %q#D member function declared in class %qT",
6840 if (DECL_CONSTRUCTOR_P (decl) && !grok_ctor_properties (ctype, decl))
6843 if (ctype == NULL_TREE || check)
6847 DECL_VIRTUAL_P (decl) = 1;
6852 /* DECL is a VAR_DECL for a static data member. Set flags to reflect
6853 the linkage that DECL will receive in the object file. */
6856 set_linkage_for_static_data_member (tree decl)
6858 /* A static data member always has static storage duration and
6859 external linkage. Note that static data members are forbidden in
6860 local classes -- the only situation in which a class has
6861 non-external linkage. */
6862 TREE_PUBLIC (decl) = 1;
6863 TREE_STATIC (decl) = 1;
6864 /* For non-template classes, static data members are always put
6865 out in exactly those files where they are defined, just as
6866 with ordinary namespace-scope variables. */
6867 if (!processing_template_decl)
6868 DECL_INTERFACE_KNOWN (decl) = 1;
6871 /* Create a VAR_DECL named NAME with the indicated TYPE.
6873 If SCOPE is non-NULL, it is the class type or namespace containing
6874 the variable. If SCOPE is NULL, the variable should is created in
6875 the innermost enclosings scope. */
6878 grokvardecl (tree type,
6880 const cp_decl_specifier_seq *declspecs,
6886 tree explicit_scope;
6888 gcc_assert (!name || TREE_CODE (name) == IDENTIFIER_NODE);
6890 /* Compute the scope in which to place the variable, but remember
6891 whether or not that scope was explicitly specified by the user. */
6892 explicit_scope = scope;
6895 /* An explicit "extern" specifier indicates a namespace-scope
6897 if (declspecs->storage_class == sc_extern)
6898 scope = current_namespace;
6899 else if (!at_function_scope_p ())
6900 scope = current_scope ();
6904 && (/* If the variable is a namespace-scope variable declared in a
6905 template, we need DECL_LANG_SPECIFIC. */
6906 (TREE_CODE (scope) == NAMESPACE_DECL && processing_template_decl)
6907 /* Similarly for namespace-scope variables with language linkage
6909 || (TREE_CODE (scope) == NAMESPACE_DECL
6910 && current_lang_name != lang_name_cplusplus)
6911 /* Similarly for static data members. */
6913 decl = build_lang_decl (VAR_DECL, name, type);
6915 decl = build_decl (VAR_DECL, name, type);
6917 if (explicit_scope && TREE_CODE (explicit_scope) == NAMESPACE_DECL)
6918 set_decl_namespace (decl, explicit_scope, 0);
6920 DECL_CONTEXT (decl) = FROB_CONTEXT (scope);
6922 if (declspecs->storage_class == sc_extern)
6924 DECL_THIS_EXTERN (decl) = 1;
6925 DECL_EXTERNAL (decl) = !initialized;
6928 if (DECL_CLASS_SCOPE_P (decl))
6930 set_linkage_for_static_data_member (decl);
6931 /* This function is only called with out-of-class definitions. */
6932 DECL_EXTERNAL (decl) = 0;
6933 check_class_member_definition_namespace (decl);
6935 /* At top level, either `static' or no s.c. makes a definition
6936 (perhaps tentative), and absence of `static' makes it public. */
6937 else if (toplevel_bindings_p ())
6939 TREE_PUBLIC (decl) = (declspecs->storage_class != sc_static
6940 && (DECL_THIS_EXTERN (decl) || ! constp));
6941 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
6943 /* Not at top level, only `static' makes a static definition. */
6946 TREE_STATIC (decl) = declspecs->storage_class == sc_static;
6947 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
6950 if (declspecs->specs[(int)ds_thread])
6951 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
6953 if (TREE_PUBLIC (decl))
6955 /* [basic.link]: A name with no linkage (notably, the name of a class
6956 or enumeration declared in a local scope) shall not be used to
6957 declare an entity with linkage.
6959 Only check this for public decls for now. */
6960 tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
6963 if (TYPE_ANONYMOUS_P (t))
6965 if (DECL_EXTERN_C_P (decl))
6966 /* Allow this; it's pretty common in C. */
6970 /* DRs 132, 319 and 389 seem to indicate types with
6971 no linkage can only be used to declare extern "C"
6972 entities. Since it's not always an error in the
6973 ISO C++ 90 Standard, we only issue a warning. */
6974 warning (0, "non-local variable %q#D uses anonymous type",
6976 if (DECL_ORIGINAL_TYPE (TYPE_NAME (t)))
6977 warning (0, "%q+#D does not refer to the unqualified "
6978 "type, so it is not used for linkage",
6983 warning (0, "non-local variable %q#D uses local type %qT", decl, t);
6987 DECL_INTERFACE_KNOWN (decl) = 1;
6992 /* Create and return a canonical pointer to member function type, for
6993 TYPE, which is a POINTER_TYPE to a METHOD_TYPE. */
6996 build_ptrmemfunc_type (tree type)
7000 tree unqualified_variant = NULL_TREE;
7002 if (type == error_mark_node)
7005 /* If a canonical type already exists for this type, use it. We use
7006 this method instead of type_hash_canon, because it only does a
7007 simple equality check on the list of field members. */
7009 if ((t = TYPE_GET_PTRMEMFUNC_TYPE (type)))
7012 /* Make sure that we always have the unqualified pointer-to-member
7014 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7016 = build_ptrmemfunc_type (TYPE_MAIN_VARIANT (type));
7018 t = make_class_type (RECORD_TYPE);
7019 xref_basetypes (t, NULL_TREE);
7021 /* Let the front end know this is a pointer to member function... */
7022 TYPE_PTRMEMFUNC_FLAG (t) = 1;
7023 /* ... and not really a class type. */
7024 SET_CLASS_TYPE_P (t, 0);
7026 field = build_decl (FIELD_DECL, pfn_identifier, type);
7029 field = build_decl (FIELD_DECL, delta_identifier, delta_type_node);
7030 TREE_CHAIN (field) = fields;
7033 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
7035 /* Zap out the name so that the back end will give us the debugging
7036 information for this anonymous RECORD_TYPE. */
7037 TYPE_NAME (t) = NULL_TREE;
7039 /* If this is not the unqualified form of this pointer-to-member
7040 type, set the TYPE_MAIN_VARIANT for this type to be the
7041 unqualified type. Since they are actually RECORD_TYPEs that are
7042 not variants of each other, we must do this manually. */
7043 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
7045 t = build_qualified_type (t, cp_type_quals (type));
7046 TYPE_MAIN_VARIANT (t) = unqualified_variant;
7047 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (unqualified_variant);
7048 TYPE_NEXT_VARIANT (unqualified_variant) = t;
7049 TREE_TYPE (TYPE_BINFO (t)) = t;
7052 /* Cache this pointer-to-member type so that we can find it again
7054 TYPE_SET_PTRMEMFUNC_TYPE (type, t);
7056 if (TYPE_STRUCTURAL_EQUALITY_P (type))
7057 SET_TYPE_STRUCTURAL_EQUALITY (t);
7058 else if (TYPE_CANONICAL (type) != type)
7059 TYPE_CANONICAL (t) = build_ptrmemfunc_type (TYPE_CANONICAL (type));
7064 /* Create and return a pointer to data member type. */
7067 build_ptrmem_type (tree class_type, tree member_type)
7069 if (TREE_CODE (member_type) == METHOD_TYPE)
7073 arg_types = TYPE_ARG_TYPES (member_type);
7074 class_type = (cp_build_qualified_type
7076 cp_type_quals (TREE_TYPE (TREE_VALUE (arg_types)))));
7078 = build_method_type_directly (class_type,
7079 TREE_TYPE (member_type),
7080 TREE_CHAIN (arg_types));
7081 return build_ptrmemfunc_type (build_pointer_type (member_type));
7085 gcc_assert (TREE_CODE (member_type) != FUNCTION_TYPE);
7086 return build_offset_type (class_type, member_type);
7090 /* DECL is a VAR_DECL defined in-class, whose TYPE is also given.
7091 Check to see that the definition is valid. Issue appropriate error
7092 messages. Return 1 if the definition is particularly bad, or 0
7096 check_static_variable_definition (tree decl, tree type)
7098 /* Motion 10 at San Diego: If a static const integral data member is
7099 initialized with an integral constant expression, the initializer
7100 may appear either in the declaration (within the class), or in
7101 the definition, but not both. If it appears in the class, the
7102 member is a member constant. The file-scope definition is always
7104 if (!ARITHMETIC_TYPE_P (type) && TREE_CODE (type) != ENUMERAL_TYPE)
7106 error ("invalid in-class initialization of static data member "
7107 "of non-integral type %qT",
7109 /* If we just return the declaration, crashes will sometimes
7110 occur. We therefore return void_type_node, as if this were a
7111 friend declaration, to cause callers to completely ignore
7112 this declaration. */
7115 else if (!CP_TYPE_CONST_P (type))
7116 error ("ISO C++ forbids in-class initialization of non-const "
7117 "static member %qD",
7119 else if (!INTEGRAL_TYPE_P (type))
7120 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids initialization of member constant "
7121 "%qD of non-integral type %qT", decl, type);
7126 /* Given the SIZE (i.e., number of elements) in an array, compute an
7127 appropriate index type for the array. If non-NULL, NAME is the
7128 name of the thing being declared. */
7131 compute_array_index_type (tree name, tree size)
7135 tree abi_1_itype = NULL_TREE;
7137 if (error_operand_p (size))
7138 return error_mark_node;
7140 type = TREE_TYPE (size);
7141 /* The array bound must be an integer type. */
7142 if (!dependent_type_p (type) && !INTEGRAL_TYPE_P (type))
7145 error ("size of array %qD has non-integral type %qT", name, type);
7147 error ("size of array has non-integral type %qT", type);
7148 size = integer_one_node;
7149 type = TREE_TYPE (size);
7152 if (value_dependent_expression_p (size))
7154 /* We cannot do any checking for a value-dependent SIZE. Just
7155 build the index type and mark that it requires structural
7157 itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7158 size, integer_one_node));
7159 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7163 if (!abi_version_at_least (2) && processing_template_decl)
7164 /* For abi-1, we handled all instances in templates the same way,
7165 even when they were non-dependent. This affects the manglings
7166 produced. So, we do the normal checking for non-dependent
7167 sizes, but at the end we'll return the same type that abi-1
7168 would have, but with TYPE_CANONICAL set to the "right"
7169 value that the current ABI would provide. */
7170 abi_1_itype = build_index_type (build_min (MINUS_EXPR, sizetype,
7171 size, integer_one_node));
7173 /* The size might be the result of a cast. */
7174 STRIP_TYPE_NOPS (size);
7176 /* It might be a const variable or enumeration constant. */
7177 size = integral_constant_value (size);
7179 /* Normally, the array-bound will be a constant. */
7180 if (TREE_CODE (size) == INTEGER_CST)
7182 /* Check to see if the array bound overflowed. Make that an
7183 error, no matter how generous we're being. */
7184 constant_expression_error (size);
7186 /* An array must have a positive number of elements. */
7187 if (INT_CST_LT (size, integer_zero_node))
7190 error ("size of array %qD is negative", name);
7192 error ("size of array is negative");
7193 size = integer_one_node;
7195 /* As an extension we allow zero-sized arrays. We always allow
7196 them in system headers because glibc uses them. */
7197 else if (integer_zerop (size) && !in_system_header)
7200 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array %qD", name);
7202 pedwarn (input_location, OPT_pedantic, "ISO C++ forbids zero-size array");
7205 else if (TREE_CONSTANT (size))
7207 /* `(int) &fn' is not a valid array bound. */
7209 error ("size of array %qD is not an integral constant-expression",
7212 error ("size of array is not an integral constant-expression");
7213 size = integer_one_node;
7215 else if (pedantic && warn_vla != 0)
7218 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array %qD", name);
7220 pedwarn (input_location, OPT_Wvla, "ISO C++ forbids variable length array");
7222 else if (warn_vla > 0)
7226 "variable length array %qD is used", name);
7229 "variable length array is used");
7232 if (processing_template_decl && !TREE_CONSTANT (size))
7233 /* A variable sized array. */
7234 itype = build_min (MINUS_EXPR, sizetype, size, integer_one_node);
7237 HOST_WIDE_INT saved_processing_template_decl;
7239 /* Compute the index of the largest element in the array. It is
7240 one less than the number of elements in the array. We save
7241 and restore PROCESSING_TEMPLATE_DECL so that computations in
7242 cp_build_binary_op will be appropriately folded. */
7243 saved_processing_template_decl = processing_template_decl;
7244 processing_template_decl = 0;
7245 itype = cp_build_binary_op (input_location,
7247 cp_convert (ssizetype, size),
7248 cp_convert (ssizetype, integer_one_node),
7249 tf_warning_or_error);
7250 itype = fold (itype);
7251 processing_template_decl = saved_processing_template_decl;
7253 if (!TREE_CONSTANT (itype))
7254 /* A variable sized array. */
7255 itype = variable_size (itype);
7256 /* Make sure that there was no overflow when creating to a signed
7257 index type. (For example, on a 32-bit machine, an array with
7258 size 2^32 - 1 is too big.) */
7259 else if (TREE_CODE (itype) == INTEGER_CST
7260 && TREE_OVERFLOW (itype))
7262 error ("overflow in array dimension");
7263 TREE_OVERFLOW (itype) = 0;
7267 /* Create and return the appropriate index type. */
7270 tree t = build_index_type (itype);
7271 TYPE_CANONICAL (abi_1_itype) = TYPE_CANONICAL (t);
7275 return build_index_type (itype);
7278 /* Returns the scope (if any) in which the entity declared by
7279 DECLARATOR will be located. If the entity was declared with an
7280 unqualified name, NULL_TREE is returned. */
7283 get_scope_of_declarator (const cp_declarator *declarator)
7285 while (declarator && declarator->kind != cdk_id)
7286 declarator = declarator->declarator;
7288 /* If the declarator-id is a SCOPE_REF, the scope in which the
7289 declaration occurs is the first operand. */
7291 && declarator->u.id.qualifying_scope)
7292 return declarator->u.id.qualifying_scope;
7294 /* Otherwise, the declarator is not a qualified name; the entity will
7295 be declared in the current scope. */
7299 /* Returns an ARRAY_TYPE for an array with SIZE elements of the
7300 indicated TYPE. If non-NULL, NAME is the NAME of the declaration
7304 create_array_type_for_decl (tree name, tree type, tree size)
7306 tree itype = NULL_TREE;
7307 const char* error_msg;
7309 /* If things have already gone awry, bail now. */
7310 if (type == error_mark_node || size == error_mark_node)
7311 return error_mark_node;
7313 /* Assume that everything will go OK. */
7316 /* There are some types which cannot be array elements. */
7317 switch (TREE_CODE (type))
7320 error_msg = "array of void";
7324 error_msg = "array of functions";
7327 case REFERENCE_TYPE:
7328 error_msg = "array of references";
7332 error_msg = "array of function members";
7339 /* If something went wrong, issue an error-message and return. */
7343 error ("declaration of %qD as %s", name, error_msg);
7345 error ("creating %s", error_msg);
7347 return error_mark_node;
7352 The constant expressions that specify the bounds of the arrays
7353 can be omitted only for the first member of the sequence. */
7354 if (TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
7357 error ("declaration of %qD as multidimensional array must "
7358 "have bounds for all dimensions except the first",
7361 error ("multidimensional array must have bounds for all "
7362 "dimensions except the first");
7364 return error_mark_node;
7367 /* Figure out the index type for the array. */
7369 itype = compute_array_index_type (name, size);
7372 T is called the array element type; this type shall not be [...] an
7373 abstract class type. */
7374 abstract_virtuals_error (name, type);
7376 return build_cplus_array_type (type, itype);
7379 /* Check that it's OK to declare a function with the indicated TYPE.
7380 SFK indicates the kind of special function (if any) that this
7381 function is. OPTYPE is the type given in a conversion operator
7382 declaration, or the class type for a constructor/destructor.
7383 Returns the actual return type of the function; that
7384 may be different than TYPE if an error occurs, or for certain
7385 special functions. */
7388 check_special_function_return_type (special_function_kind sfk,
7394 case sfk_constructor:
7396 error ("return type specification for constructor invalid");
7398 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7399 type = build_pointer_type (optype);
7401 type = void_type_node;
7404 case sfk_destructor:
7406 error ("return type specification for destructor invalid");
7407 /* We can't use the proper return type here because we run into
7408 problems with ambiguous bases and covariant returns.
7409 Java classes are left unchanged because (void *) isn't a valid
7410 Java type, and we don't want to change the Java ABI. */
7411 if (targetm.cxx.cdtor_returns_this () && !TYPE_FOR_JAVA (optype))
7412 type = build_pointer_type (void_type_node);
7414 type = void_type_node;
7417 case sfk_conversion:
7419 error ("return type specified for %<operator %T%>", optype);
7430 /* A variable or data member (whose unqualified name is IDENTIFIER)
7431 has been declared with the indicated TYPE. If the TYPE is not
7432 acceptable, issue an error message and return a type to use for
7433 error-recovery purposes. */
7436 check_var_type (tree identifier, tree type)
7438 if (VOID_TYPE_P (type))
7441 error ("unnamed variable or field declared void");
7442 else if (TREE_CODE (identifier) == IDENTIFIER_NODE)
7444 gcc_assert (!IDENTIFIER_OPNAME_P (identifier));
7445 error ("variable or field %qE declared void", identifier);
7448 error ("variable or field declared void");
7449 type = error_mark_node;
7455 /* Given declspecs and a declarator (abstract or otherwise), determine
7456 the name and type of the object declared and construct a DECL node
7459 DECLSPECS points to the representation of declaration-specifier
7460 sequence that precedes declarator.
7462 DECL_CONTEXT says which syntactic context this declaration is in:
7463 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
7464 FUNCDEF for a function definition. Like NORMAL but a few different
7465 error messages in each case. Return value may be zero meaning
7466 this definition is too screwy to try to parse.
7467 MEMFUNCDEF for a function definition. Like FUNCDEF but prepares to
7468 handle member functions (which have FIELD context).
7469 Return value may be zero meaning this definition is too screwy to
7471 PARM for a parameter declaration (either within a function prototype
7472 or before a function body). Make a PARM_DECL, or return void_type_node.
7473 CATCHPARM for a parameter declaration before a catch clause.
7474 TYPENAME if for a typename (in a cast or sizeof).
7475 Don't make a DECL node; just return the ..._TYPE node.
7476 FIELD for a struct or union field; make a FIELD_DECL.
7477 BITFIELD for a field with specified width.
7478 INITIALIZED is as for start_decl.
7480 ATTRLIST is a pointer to the list of attributes, which may be NULL
7481 if there are none; *ATTRLIST may be modified if attributes from inside
7482 the declarator should be applied to the declaration.
7484 When this function is called, scoping variables (such as
7485 CURRENT_CLASS_TYPE) should reflect the scope in which the
7486 declaration occurs, not the scope in which the new declaration will
7487 be placed. For example, on:
7491 when grokdeclarator is called for `S::f', the CURRENT_CLASS_TYPE
7494 Returns a DECL (if a declarator is present), a TYPE (if there is no
7495 declarator, in cases like "struct S;"), or the ERROR_MARK_NODE if an
7499 grokdeclarator (const cp_declarator *declarator,
7500 const cp_decl_specifier_seq *declspecs,
7501 enum decl_context decl_context,
7505 tree type = NULL_TREE;
7507 int virtualp, explicitp, friendp, inlinep, staticp;
7508 int explicit_int = 0;
7509 int explicit_char = 0;
7510 int defaulted_int = 0;
7511 tree dependent_name = NULL_TREE;
7513 tree typedef_decl = NULL_TREE;
7514 const char *name = NULL;
7515 tree typedef_type = NULL_TREE;
7516 /* True if this declarator is a function definition. */
7517 bool funcdef_flag = false;
7518 cp_declarator_kind innermost_code = cdk_error;
7521 /* See the code below that used this. */
7522 tree decl_attr = NULL_TREE;
7525 /* Keep track of what sort of function is being processed
7526 so that we can warn about default return values, or explicit
7527 return values which do not match prescribed defaults. */
7528 special_function_kind sfk = sfk_none;
7530 tree dname = NULL_TREE;
7531 tree ctor_return_type = NULL_TREE;
7532 enum overload_flags flags = NO_SPECIAL;
7533 /* cv-qualifiers that apply to the declarator, for a declaration of
7534 a member function. */
7535 cp_cv_quals memfn_quals = TYPE_UNQUALIFIED;
7536 /* cv-qualifiers that apply to the type specified by the DECLSPECS. */
7538 tree raises = NULL_TREE;
7539 int template_count = 0;
7540 tree returned_attrs = NULL_TREE;
7541 tree parms = NULL_TREE;
7542 const cp_declarator *id_declarator;
7543 /* The unqualified name of the declarator; either an
7544 IDENTIFIER_NODE, BIT_NOT_EXPR, or TEMPLATE_ID_EXPR. */
7545 tree unqualified_id;
7546 /* The class type, if any, in which this entity is located,
7547 or NULL_TREE if none. Note that this value may be different from
7548 the current class type; for example if an attempt is made to declare
7549 "A::f" inside "B", this value will be "A". */
7550 tree ctype = current_class_type;
7551 /* The NAMESPACE_DECL for the namespace in which this entity is
7552 located. If an unqualified name is used to declare the entity,
7553 this value will be NULL_TREE, even if the entity is located at
7555 tree in_namespace = NULL_TREE;
7556 cp_storage_class storage_class;
7557 bool unsigned_p, signed_p, short_p, long_p, thread_p;
7558 bool type_was_error_mark_node = false;
7559 bool parameter_pack_p = declarator? declarator->parameter_pack_p : false;
7560 bool set_no_warning = false;
7562 signed_p = declspecs->specs[(int)ds_signed];
7563 unsigned_p = declspecs->specs[(int)ds_unsigned];
7564 short_p = declspecs->specs[(int)ds_short];
7565 long_p = declspecs->specs[(int)ds_long];
7566 longlong = declspecs->specs[(int)ds_long] >= 2;
7567 thread_p = declspecs->specs[(int)ds_thread];
7569 if (decl_context == FUNCDEF)
7570 funcdef_flag = true, decl_context = NORMAL;
7571 else if (decl_context == MEMFUNCDEF)
7572 funcdef_flag = true, decl_context = FIELD;
7573 else if (decl_context == BITFIELD)
7574 bitfield = 1, decl_context = FIELD;
7576 if (initialized > 1)
7577 funcdef_flag = true;
7579 /* Look inside a declarator for the name being declared
7580 and get it as a string, for an error message. */
7581 for (id_declarator = declarator;
7583 id_declarator = id_declarator->declarator)
7585 if (id_declarator->kind != cdk_id)
7586 innermost_code = id_declarator->kind;
7588 switch (id_declarator->kind)
7591 if (id_declarator->declarator
7592 && id_declarator->declarator->kind == cdk_id)
7594 sfk = id_declarator->declarator->u.id.sfk;
7595 if (sfk == sfk_destructor)
7602 tree qualifying_scope = id_declarator->u.id.qualifying_scope;
7603 tree decl = id_declarator->u.id.unqualified_name;
7606 if (qualifying_scope)
7608 if (at_function_scope_p ())
7612 A declarator-id shall not be qualified except
7615 None of the cases are permitted in block
7617 if (qualifying_scope == global_namespace)
7618 error ("invalid use of qualified-name %<::%D%>",
7620 else if (TYPE_P (qualifying_scope))
7621 error ("invalid use of qualified-name %<%T::%D%>",
7622 qualifying_scope, decl);
7624 error ("invalid use of qualified-name %<%D::%D%>",
7625 qualifying_scope, decl);
7626 return error_mark_node;
7628 else if (TYPE_P (qualifying_scope))
7630 ctype = qualifying_scope;
7631 if (innermost_code != cdk_function
7632 && current_class_type
7633 && !UNIQUELY_DERIVED_FROM_P (ctype,
7634 current_class_type))
7636 error ("type %qT is not derived from type %qT",
7637 ctype, current_class_type);
7638 return error_mark_node;
7641 else if (TREE_CODE (qualifying_scope) == NAMESPACE_DECL)
7642 in_namespace = qualifying_scope;
7644 switch (TREE_CODE (decl))
7650 if (innermost_code != cdk_function)
7652 error ("declaration of %qD as non-function", decl);
7653 return error_mark_node;
7655 else if (!qualifying_scope
7656 && !(current_class_type && at_class_scope_p ()))
7658 error ("declaration of %qD as non-member", decl);
7659 return error_mark_node;
7662 type = TREE_OPERAND (decl, 0);
7663 name = IDENTIFIER_POINTER (constructor_name (type));
7668 case TEMPLATE_ID_EXPR:
7670 tree fns = TREE_OPERAND (decl, 0);
7673 if (TREE_CODE (dname) != IDENTIFIER_NODE)
7675 gcc_assert (is_overloaded_fn (dname));
7676 dname = DECL_NAME (get_first_fn (dname));
7681 case IDENTIFIER_NODE:
7682 if (TREE_CODE (decl) == IDENTIFIER_NODE)
7685 if (C_IS_RESERVED_WORD (dname))
7687 error ("declarator-id missing; using reserved word %qD",
7689 name = IDENTIFIER_POINTER (dname);
7691 else if (!IDENTIFIER_TYPENAME_P (dname))
7692 name = IDENTIFIER_POINTER (dname);
7695 gcc_assert (flags == NO_SPECIAL);
7696 flags = TYPENAME_FLAG;
7697 ctor_return_type = TREE_TYPE (dname);
7698 sfk = sfk_conversion;
7699 if (is_typename_at_global_scope (dname))
7700 name = IDENTIFIER_POINTER (dname);
7702 name = "<invalid operator>";
7719 return error_mark_node;
7724 if (id_declarator->kind == cdk_id)
7730 The declarator in a function-definition shall have the form
7731 D1 ( parameter-declaration-clause) ... */
7732 if (funcdef_flag && innermost_code != cdk_function)
7734 error ("function definition does not declare parameters");
7735 return error_mark_node;
7738 if (((dname && IDENTIFIER_OPNAME_P (dname)) || flags == TYPENAME_FLAG)
7739 && innermost_code != cdk_function
7740 && ! (ctype && !declspecs->any_specifiers_p))
7742 error ("declaration of %qD as non-function", dname);
7743 return error_mark_node;
7746 /* Anything declared one level down from the top level
7747 must be one of the parameters of a function
7748 (because the body is at least two levels down). */
7750 /* This heuristic cannot be applied to C++ nodes! Fixed, however,
7751 by not allowing C++ class definitions to specify their parameters
7752 with xdecls (must be spec.d in the parmlist).
7754 Since we now wait to push a class scope until we are sure that
7755 we are in a legitimate method context, we must set oldcname
7756 explicitly (since current_class_name is not yet alive).
7758 We also want to avoid calling this a PARM if it is in a namespace. */
7760 if (decl_context == NORMAL && !toplevel_bindings_p ())
7762 struct cp_binding_level *b = current_binding_level;
7763 current_binding_level = b->level_chain;
7764 if (current_binding_level != 0 && toplevel_bindings_p ())
7765 decl_context = PARM;
7766 current_binding_level = b;
7770 name = decl_context == PARM ? "parameter" : "type name";
7772 /* If there were multiple types specified in the decl-specifier-seq,
7773 issue an error message. */
7774 if (declspecs->multiple_types_p)
7776 error ("two or more data types in declaration of %qs", name);
7777 return error_mark_node;
7780 if (declspecs->conflicting_specifiers_p)
7782 error ("conflicting specifiers in declaration of %qs", name);
7783 return error_mark_node;
7786 /* Extract the basic type from the decl-specifier-seq. */
7787 type = declspecs->type;
7788 if (type == error_mark_node)
7791 type_was_error_mark_node = true;
7793 /* If the entire declaration is itself tagged as deprecated then
7794 suppress reports of deprecated items. */
7795 if (type && TREE_DEPRECATED (type)
7796 && deprecated_state != DEPRECATED_SUPPRESS)
7797 warn_deprecated_use (type);
7798 if (type && TREE_CODE (type) == TYPE_DECL)
7800 typedef_decl = type;
7801 type = TREE_TYPE (typedef_decl);
7802 if (TREE_DEPRECATED (type)
7803 && DECL_ARTIFICIAL (typedef_decl)
7804 && deprecated_state != DEPRECATED_SUPPRESS)
7805 warn_deprecated_use (type);
7807 /* No type at all: default to `int', and set DEFAULTED_INT
7808 because it was not a user-defined typedef. */
7809 if (type == NULL_TREE && (signed_p || unsigned_p || long_p || short_p))
7811 /* These imply 'int'. */
7812 type = integer_type_node;
7816 explicit_int = declspecs->explicit_int_p;
7817 explicit_char = declspecs->explicit_char_p;
7820 /* See the code below that used this. */
7822 decl_attr = DECL_ATTRIBUTES (typedef_decl);
7824 typedef_type = type;
7827 if (sfk != sfk_conversion)
7828 ctor_return_type = ctype;
7830 if (sfk != sfk_none)
7831 type = check_special_function_return_type (sfk, type,
7833 else if (type == NULL_TREE)
7839 /* We handle `main' specially here, because 'main () { }' is so
7840 common. With no options, it is allowed. With -Wreturn-type,
7841 it is a warning. It is only an error with -pedantic-errors. */
7842 is_main = (funcdef_flag
7843 && dname && MAIN_NAME_P (dname)
7844 && ctype == NULL_TREE
7845 && in_namespace == NULL_TREE
7846 && current_namespace == global_namespace);
7848 if (type_was_error_mark_node)
7849 /* We've already issued an error, don't complain more. */;
7850 else if (in_system_header || flag_ms_extensions)
7851 /* Allow it, sigh. */;
7853 permerror (input_location, "ISO C++ forbids declaration of %qs with no type", name);
7855 pedwarn (input_location, OPT_pedantic,
7856 "ISO C++ forbids declaration of %qs with no type", name);
7858 warning (OPT_Wreturn_type,
7859 "ISO C++ forbids declaration of %qs with no type", name);
7861 type = integer_type_node;
7866 /* Now process the modifiers that were specified
7867 and check for invalid combinations. */
7869 /* Long double is a special combination. */
7870 if (long_p && !longlong && TYPE_MAIN_VARIANT (type) == double_type_node)
7873 type = build_qualified_type (long_double_type_node,
7874 cp_type_quals (type));
7877 /* Check all other uses of type modifiers. */
7879 if (unsigned_p || signed_p || long_p || short_p)
7883 if ((signed_p || unsigned_p) && TREE_CODE (type) != INTEGER_TYPE)
7884 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7885 else if (signed_p && unsigned_p)
7886 error ("%<signed%> and %<unsigned%> specified together for %qs", name);
7887 else if (longlong && TREE_CODE (type) != INTEGER_TYPE)
7888 error ("%<long long%> invalid for %qs", name);
7889 else if (long_p && TREE_CODE (type) == REAL_TYPE)
7890 error ("%<long%> invalid for %qs", name);
7891 else if (short_p && TREE_CODE (type) == REAL_TYPE)
7892 error ("%<short%> invalid for %qs", name);
7893 else if ((long_p || short_p) && TREE_CODE (type) != INTEGER_TYPE)
7894 error ("%<long%> or %<short%> invalid for %qs", name);
7895 else if ((long_p || short_p) && explicit_char)
7896 error ("%<long%> or %<short%> specified with char for %qs", name);
7897 else if (long_p && short_p)
7898 error ("%<long%> and %<short%> specified together for %qs", name);
7899 else if (type == char16_type_node || type == char32_type_node)
7901 if (signed_p || unsigned_p)
7902 error ("%<signed%> or %<unsigned%> invalid for %qs", name);
7903 else if (short_p || long_p)
7904 error ("%<short%> or %<long%> invalid for %qs", name);
7909 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
7911 pedwarn (input_location, OPT_pedantic,
7912 "long, short, signed or unsigned used invalidly for %qs",
7914 if (flag_pedantic_errors)
7919 /* Discard the type modifiers if they are invalid. */
7930 /* Decide whether an integer type is signed or not.
7931 Optionally treat bitfields as signed by default. */
7935 It is implementation-defined whether a plain (neither
7936 explicitly signed or unsigned) char, short, int, or long
7937 bit-field is signed or unsigned.
7939 Naturally, we extend this to long long as well. Note that
7940 this does not include wchar_t. */
7941 || (bitfield && !flag_signed_bitfields
7943 /* A typedef for plain `int' without `signed' can be
7944 controlled just like plain `int', but a typedef for
7945 `signed int' cannot be so controlled. */
7947 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl))
7948 && TREE_CODE (type) == INTEGER_TYPE
7949 && !same_type_p (TYPE_MAIN_VARIANT (type), wchar_type_node)))
7952 type = long_long_unsigned_type_node;
7954 type = long_unsigned_type_node;
7956 type = short_unsigned_type_node;
7957 else if (type == char_type_node)
7958 type = unsigned_char_type_node;
7959 else if (typedef_decl)
7960 type = unsigned_type_for (type);
7962 type = unsigned_type_node;
7964 else if (signed_p && type == char_type_node)
7965 type = signed_char_type_node;
7967 type = long_long_integer_type_node;
7969 type = long_integer_type_node;
7971 type = short_integer_type_node;
7973 if (declspecs->specs[(int)ds_complex])
7975 if (TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
7976 error ("complex invalid for %qs", name);
7977 /* If we just have "complex", it is equivalent to
7978 "complex double", but if any modifiers at all are specified it is
7979 the complex form of TYPE. E.g, "complex short" is
7980 "complex short int". */
7982 else if (defaulted_int && ! longlong
7983 && ! (long_p || short_p || signed_p || unsigned_p))
7984 type = complex_double_type_node;
7985 else if (type == integer_type_node)
7986 type = complex_integer_type_node;
7987 else if (type == float_type_node)
7988 type = complex_float_type_node;
7989 else if (type == double_type_node)
7990 type = complex_double_type_node;
7991 else if (type == long_double_type_node)
7992 type = complex_long_double_type_node;
7994 type = build_complex_type (type);
7997 type_quals = TYPE_UNQUALIFIED;
7998 if (declspecs->specs[(int)ds_const])
7999 type_quals |= TYPE_QUAL_CONST;
8000 if (declspecs->specs[(int)ds_volatile])
8001 type_quals |= TYPE_QUAL_VOLATILE;
8002 if (declspecs->specs[(int)ds_restrict])
8003 type_quals |= TYPE_QUAL_RESTRICT;
8004 if (sfk == sfk_conversion && type_quals != TYPE_UNQUALIFIED)
8005 error ("qualifiers are not allowed on declaration of %<operator %T%>",
8008 if (TREE_CODE (type) == FUNCTION_TYPE
8009 && type_quals != TYPE_UNQUALIFIED)
8011 /* This was an error in C++98 (cv-qualifiers cannot be added to
8012 a function type), but DR 295 makes the code well-formed by
8013 dropping the extra qualifiers. */
8016 tree bad_type = build_qualified_type (type, type_quals);
8017 pedwarn (input_location, OPT_pedantic,
8018 "ignoring %qV qualifiers added to function type %qT",
8021 type_quals = TYPE_UNQUALIFIED;
8023 type_quals |= cp_type_quals (type);
8024 type = cp_build_qualified_type_real
8025 (type, type_quals, ((typedef_decl && !DECL_ARTIFICIAL (typedef_decl)
8026 ? tf_ignore_bad_quals : 0) | tf_warning_or_error));
8027 /* We might have ignored or rejected some of the qualifiers. */
8028 type_quals = cp_type_quals (type);
8031 inlinep = !! declspecs->specs[(int)ds_inline];
8032 virtualp = !! declspecs->specs[(int)ds_virtual];
8033 explicitp = !! declspecs->specs[(int)ds_explicit];
8035 storage_class = declspecs->storage_class;
8036 if (storage_class == sc_static)
8037 staticp = 1 + (decl_context == FIELD);
8039 if (virtualp && staticp == 2)
8041 error ("member %qD cannot be declared both virtual and static", dname);
8042 storage_class = sc_none;
8045 friendp = !! declspecs->specs[(int)ds_friend];
8047 if (dependent_name && !friendp)
8049 error ("%<%T::%D%> is not a valid declarator", ctype, dependent_name);
8050 return error_mark_node;
8053 /* Issue errors about use of storage classes for parameters. */
8054 if (decl_context == PARM)
8056 if (declspecs->specs[(int)ds_typedef])
8058 error ("typedef declaration invalid in parameter declaration");
8059 return error_mark_node;
8061 else if (storage_class == sc_static
8062 || storage_class == sc_extern
8064 error ("storage class specifiers invalid in parameter declarations");
8066 if (type_uses_auto (type))
8068 error ("parameter declared %<auto%>");
8069 type = error_mark_node;
8073 /* Give error if `virtual' is used outside of class declaration. */
8075 && (current_class_name == NULL_TREE || decl_context != FIELD))
8077 error ("%<virtual%> outside class declaration");
8081 /* Static anonymous unions are dealt with here. */
8082 if (staticp && decl_context == TYPENAME
8084 && ANON_AGGR_TYPE_P (declspecs->type))
8085 decl_context = FIELD;
8087 /* Warn about storage classes that are invalid for certain
8088 kinds of declarations (parameters, typenames, etc.). */
8091 && storage_class != sc_extern
8092 && storage_class != sc_static)
8093 || declspecs->specs[(int)ds_typedef]))
8095 error ("multiple storage classes in declaration of %qs", name);
8098 if (decl_context != NORMAL
8099 && ((storage_class != sc_none
8100 && storage_class != sc_mutable)
8103 if ((decl_context == PARM || decl_context == CATCHPARM)
8104 && (storage_class == sc_register
8105 || storage_class == sc_auto))
8107 else if (declspecs->specs[(int)ds_typedef])
8109 else if (decl_context == FIELD
8110 /* C++ allows static class elements. */
8111 && storage_class == sc_static)
8112 /* C++ also allows inlines and signed and unsigned elements,
8113 but in those cases we don't come in here. */
8117 if (decl_context == FIELD)
8118 error ("storage class specified for %qs", name);
8121 if (decl_context == PARM || decl_context == CATCHPARM)
8122 error ("storage class specified for parameter %qs", name);
8124 error ("storage class specified for typename");
8126 if (storage_class == sc_register
8127 || storage_class == sc_auto
8128 || storage_class == sc_extern
8130 storage_class = sc_none;
8133 else if (storage_class == sc_extern && funcdef_flag
8134 && ! toplevel_bindings_p ())
8135 error ("nested function %qs declared %<extern%>", name);
8136 else if (toplevel_bindings_p ())
8138 if (storage_class == sc_auto)
8139 error ("top-level declaration of %qs specifies %<auto%>", name);
8142 && storage_class != sc_extern
8143 && storage_class != sc_static)
8145 error ("function-scope %qs implicitly auto and declared %<__thread%>",
8150 if (storage_class && friendp)
8152 error ("storage class specifiers invalid in friend function declarations");
8153 storage_class = sc_none;
8158 unqualified_id = NULL_TREE;
8161 unqualified_id = id_declarator->u.id.unqualified_name;
8162 switch (TREE_CODE (unqualified_id))
8166 = constructor_name (TREE_OPERAND (unqualified_id, 0));
8169 case IDENTIFIER_NODE:
8170 case TEMPLATE_ID_EXPR:
8178 /* Determine the type of the entity declared by recurring on the
8180 for (; declarator; declarator = declarator->declarator)
8182 const cp_declarator *inner_declarator;
8185 if (type == error_mark_node)
8186 return error_mark_node;
8188 attrs = declarator->attributes;
8194 if (declarator == NULL || declarator->kind == cdk_id)
8195 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
8196 if (declarator->kind == cdk_function)
8197 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
8198 if (declarator->kind == cdk_array)
8199 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
8200 returned_attrs = decl_attributes (&type,
8201 chainon (returned_attrs, attrs),
8205 if (declarator->kind == cdk_id)
8208 inner_declarator = declarator->declarator;
8210 switch (declarator->kind)
8213 type = create_array_type_for_decl (dname, type,
8214 declarator->u.array.bounds);
8222 /* Declaring a function type.
8223 Make sure we have a valid type for the function to return. */
8225 if (type_quals != TYPE_UNQUALIFIED)
8227 if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
8228 warning (OPT_Wignored_qualifiers,
8229 "type qualifiers ignored on function return type");
8230 /* We now know that the TYPE_QUALS don't apply to the
8231 decl, but to its return type. */
8232 type_quals = TYPE_UNQUALIFIED;
8233 set_no_warning = true;
8236 /* Error about some types functions can't return. */
8238 if (TREE_CODE (type) == FUNCTION_TYPE)
8240 error ("%qs declared as function returning a function", name);
8241 return error_mark_node;
8243 if (TREE_CODE (type) == ARRAY_TYPE)
8245 error ("%qs declared as function returning an array", name);
8246 return error_mark_node;
8249 /* Pick up type qualifiers which should be applied to `this'. */
8250 memfn_quals = declarator->u.function.qualifiers;
8252 /* Pick up the exception specifications. */
8253 raises = declarator->u.function.exception_specification;
8255 /* Say it's a definition only for the CALL_EXPR
8256 closest to the identifier. */
8257 funcdecl_p = inner_declarator && inner_declarator->kind == cdk_id;
8259 /* Handle a late-specified return type. */
8262 if (type_uses_auto (type))
8264 if (!declarator->u.function.late_return_type)
8266 error ("%qs function uses %<auto%> type specifier without"
8267 " late return type", name);
8268 return error_mark_node;
8270 else if (!is_auto (type))
8272 error ("%qs function with late return type has"
8273 " %qT as its type rather than plain %<auto%>",
8275 return error_mark_node;
8278 else if (declarator->u.function.late_return_type)
8280 error ("%qs function with late return type not declared"
8281 " with %<auto%> type specifier", name);
8282 return error_mark_node;
8285 type = splice_late_return_type
8286 (type, declarator->u.function.late_return_type);
8287 if (type == error_mark_node)
8288 return error_mark_node;
8290 if (ctype == NULL_TREE
8291 && decl_context == FIELD
8293 && (friendp == 0 || dname == current_class_name))
8294 ctype = current_class_type;
8296 if (ctype && (sfk == sfk_constructor
8297 || sfk == sfk_destructor))
8299 /* We are within a class's scope. If our declarator name
8300 is the same as the class name, and we are defining
8301 a function, then it is a constructor/destructor, and
8302 therefore returns a void type. */
8304 /* ISO C++ 12.4/2. A destructor may not be declared
8305 const or volatile. A destructor may not be
8308 ISO C++ 12.1. A constructor may not be declared
8309 const or volatile. A constructor may not be
8310 virtual. A constructor may not be static. */
8312 error ((flags == DTOR_FLAG)
8313 ? "destructor cannot be static member function"
8314 : "constructor cannot be static member function");
8317 error ((flags == DTOR_FLAG)
8318 ? "destructors may not be cv-qualified"
8319 : "constructors may not be cv-qualified");
8320 memfn_quals = TYPE_UNQUALIFIED;
8323 if (decl_context == FIELD
8324 && !member_function_or_else (ctype,
8327 return error_mark_node;
8329 if (flags != DTOR_FLAG)
8331 /* It's a constructor. */
8336 permerror (input_location, "constructors cannot be declared virtual");
8339 if (decl_context == FIELD
8340 && sfk != sfk_constructor)
8341 return error_mark_node;
8343 if (decl_context == FIELD)
8349 error ("can't initialize friend function %qs", name);
8352 /* Cannot be both friend and virtual. */
8353 error ("virtual functions cannot be friends");
8356 if (decl_context == NORMAL)
8357 error ("friend declaration not in class definition");
8358 if (current_function_decl && funcdef_flag)
8359 error ("can't define friend function %qs in a local "
8364 arg_types = grokparms (declarator->u.function.parameters,
8367 if (inner_declarator
8368 && inner_declarator->kind == cdk_id
8369 && inner_declarator->u.id.sfk == sfk_destructor
8370 && arg_types != void_list_node)
8372 error ("destructors may not have parameters");
8373 arg_types = void_list_node;
8377 type = build_function_type (type, arg_types);
8384 /* Filter out pointers-to-references and references-to-references.
8385 We can get these if a TYPE_DECL is used. */
8387 if (TREE_CODE (type) == REFERENCE_TYPE)
8389 if (declarator->kind != cdk_reference)
8391 error ("cannot declare pointer to %q#T", type);
8392 type = TREE_TYPE (type);
8395 /* In C++0x, we allow reference to reference declarations
8396 that occur indirectly through typedefs [7.1.3/8 dcl.typedef]
8397 and template type arguments [14.3.1/4 temp.arg.type]. The
8398 check for direct reference to reference declarations, which
8399 are still forbidden, occurs below. Reasoning behind the change
8400 can be found in DR106, DR540, and the rvalue reference
8402 else if (cxx_dialect == cxx98)
8404 error ("cannot declare reference to %q#T", type);
8405 type = TREE_TYPE (type);
8408 else if (VOID_TYPE_P (type))
8410 if (declarator->kind == cdk_reference)
8411 error ("cannot declare reference to %q#T", type);
8412 else if (declarator->kind == cdk_ptrmem)
8413 error ("cannot declare pointer to %q#T member", type);
8416 /* We now know that the TYPE_QUALS don't apply to the decl,
8417 but to the target of the pointer. */
8418 type_quals = TYPE_UNQUALIFIED;
8420 if (declarator->kind == cdk_ptrmem
8421 && (TREE_CODE (type) == FUNCTION_TYPE
8422 || (memfn_quals && TREE_CODE (type) == METHOD_TYPE)))
8424 memfn_quals |= cp_type_quals (type);
8425 type = build_memfn_type (type,
8426 declarator->u.pointer.class_type,
8428 memfn_quals = TYPE_UNQUALIFIED;
8431 if (declarator->kind == cdk_reference)
8433 /* In C++0x, the type we are creating a reference to might be
8434 a typedef which is itself a reference type. In that case,
8435 we follow the reference collapsing rules in
8436 [7.1.3/8 dcl.typedef] to create the final reference type:
8438 "If a typedef TD names a type that is a reference to a type
8439 T, an attempt to create the type 'lvalue reference to cv TD'
8440 creates the type 'lvalue reference to T,' while an attempt
8441 to create the type "rvalue reference to cv TD' creates the
8444 if (!VOID_TYPE_P (type))
8445 type = cp_build_reference_type
8446 ((TREE_CODE (type) == REFERENCE_TYPE
8447 ? TREE_TYPE (type) : type),
8448 (declarator->u.reference.rvalue_ref
8449 && (TREE_CODE(type) != REFERENCE_TYPE
8450 || TYPE_REF_IS_RVALUE (type))));
8452 /* In C++0x, we need this check for direct reference to
8453 reference declarations, which are forbidden by
8454 [8.3.2/5 dcl.ref]. Reference to reference declarations
8455 are only allowed indirectly through typedefs and template
8456 type arguments. Example:
8458 void foo(int & &); // invalid ref-to-ref decl
8460 typedef int & int_ref;
8461 void foo(int_ref &); // valid ref-to-ref decl
8463 if (inner_declarator && inner_declarator->kind == cdk_reference)
8464 error ("cannot declare reference to %q#T, which is not "
8465 "a typedef or a template type argument", type);
8467 else if (TREE_CODE (type) == METHOD_TYPE)
8468 type = build_ptrmemfunc_type (build_pointer_type (type));
8469 else if (declarator->kind == cdk_ptrmem)
8471 gcc_assert (TREE_CODE (declarator->u.pointer.class_type)
8473 if (declarator->u.pointer.class_type == error_mark_node)
8474 /* We will already have complained. */
8475 type = error_mark_node;
8477 type = build_ptrmem_type (declarator->u.pointer.class_type,
8481 type = build_pointer_type (type);
8483 /* Process a list of type modifier keywords (such as
8484 const or volatile) that were given inside the `*' or `&'. */
8486 if (declarator->u.pointer.qualifiers)
8489 = cp_build_qualified_type (type,
8490 declarator->u.pointer.qualifiers);
8491 type_quals = cp_type_quals (type);
8504 if (unqualified_id && TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR
8505 && TREE_CODE (type) != FUNCTION_TYPE
8506 && TREE_CODE (type) != METHOD_TYPE)
8508 error ("template-id %qD used as a declarator",
8510 unqualified_id = dname;
8513 /* If TYPE is a FUNCTION_TYPE, but the function name was explicitly
8514 qualified with a class-name, turn it into a METHOD_TYPE, unless
8515 we know that the function is static. We take advantage of this
8516 opportunity to do other processing that pertains to entities
8517 explicitly declared to be class members. Note that if DECLARATOR
8518 is non-NULL, we know it is a cdk_id declarator; otherwise, we
8519 would not have exited the loop above. */
8521 && declarator->u.id.qualifying_scope
8522 && TYPE_P (declarator->u.id.qualifying_scope))
8526 ctype = declarator->u.id.qualifying_scope;
8527 ctype = TYPE_MAIN_VARIANT (ctype);
8529 while (t != NULL_TREE && CLASS_TYPE_P (t))
8531 /* You're supposed to have one `template <...>' for every
8532 template class, but you don't need one for a full
8533 specialization. For example:
8535 template <class T> struct S{};
8536 template <> struct S<int> { void f(); };
8537 void S<int>::f () {}
8539 is correct; there shouldn't be a `template <>' for the
8540 definition of `S<int>::f'. */
8541 if (CLASSTYPE_TEMPLATE_SPECIALIZATION (t)
8542 && !any_dependent_template_arguments_p (CLASSTYPE_TI_ARGS (t)))
8543 /* T is an explicit (not partial) specialization. All
8544 containing classes must therefore also be explicitly
8547 if ((CLASSTYPE_USE_TEMPLATE (t) || CLASSTYPE_IS_TEMPLATE (t))
8548 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (t)))
8549 template_count += 1;
8551 t = TYPE_MAIN_DECL (t);
8552 t = DECL_CONTEXT (t);
8555 if (ctype == current_class_type)
8559 permerror (input_location, "member functions are implicitly friends of their class");
8563 permerror (declarator->id_loc,
8564 "extra qualification %<%T::%> on member %qs",
8567 else if (/* If the qualifying type is already complete, then we
8568 can skip the following checks. */
8569 !COMPLETE_TYPE_P (ctype)
8570 && (/* If the function is being defined, then
8571 qualifying type must certainly be complete. */
8573 /* A friend declaration of "T::f" is OK, even if
8574 "T" is a template parameter. But, if this
8575 function is not a friend, the qualifying type
8577 || (!friendp && !CLASS_TYPE_P (ctype))
8578 /* For a declaration, the type need not be
8579 complete, if either it is dependent (since there
8580 is no meaningful definition of complete in that
8581 case) or the qualifying class is currently being
8583 || !(dependent_type_p (ctype)
8584 || currently_open_class (ctype)))
8585 /* Check that the qualifying type is complete. */
8586 && !complete_type_or_else (ctype, NULL_TREE))
8587 return error_mark_node;
8588 else if (TREE_CODE (type) == FUNCTION_TYPE)
8590 tree sname = declarator->u.id.unqualified_name;
8592 if (current_class_type
8593 && (!friendp || funcdef_flag))
8596 ? "cannot define member function %<%T::%s%> within %<%T%>"
8597 : "cannot declare member function %<%T::%s%> within %<%T%>",
8598 ctype, name, current_class_type);
8599 return error_mark_node;
8602 if (TREE_CODE (sname) == IDENTIFIER_NODE
8603 && NEW_DELETE_OPNAME_P (sname))
8604 /* Overloaded operator new and operator delete
8605 are always static functions. */
8608 type = build_memfn_type (type, ctype, memfn_quals);
8610 else if (declspecs->specs[(int)ds_typedef]
8611 && current_class_type)
8613 error ("cannot declare member %<%T::%s%> within %qT",
8614 ctype, name, current_class_type);
8615 return error_mark_node;
8619 /* Now TYPE has the actual type. */
8624 *attrlist = chainon (returned_attrs, *attrlist);
8626 attrlist = &returned_attrs;
8629 /* Handle parameter packs. */
8630 if (parameter_pack_p)
8632 if (decl_context == PARM)
8633 /* Turn the type into a pack expansion.*/
8634 type = make_pack_expansion (type);
8636 error ("non-parameter %qs cannot be a parameter pack", name);
8639 /* Did array size calculations overflow? */
8641 if (TREE_CODE (type) == ARRAY_TYPE
8642 && COMPLETE_TYPE_P (type)
8643 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
8644 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
8646 error ("size of array %qs is too large", name);
8647 /* If we proceed with the array type as it is, we'll eventually
8648 crash in tree_low_cst(). */
8649 type = error_mark_node;
8652 if ((decl_context == FIELD || decl_context == PARM)
8653 && !processing_template_decl
8654 && variably_modified_type_p (type, NULL_TREE))
8656 if (decl_context == FIELD)
8657 error ("data member may not have variably modified type %qT", type);
8659 error ("parameter may not have variably modified type %qT", type);
8660 type = error_mark_node;
8663 if (explicitp == 1 || (explicitp && friendp))
8665 /* [dcl.fct.spec] The explicit specifier shall only be used in
8666 declarations of constructors within a class definition. */
8667 error ("only declarations of constructors can be %<explicit%>");
8671 if (storage_class == sc_mutable)
8673 if (decl_context != FIELD || friendp)
8675 error ("non-member %qs cannot be declared %<mutable%>", name);
8676 storage_class = sc_none;
8678 else if (decl_context == TYPENAME || declspecs->specs[(int)ds_typedef])
8680 error ("non-object member %qs cannot be declared %<mutable%>", name);
8681 storage_class = sc_none;
8683 else if (TREE_CODE (type) == FUNCTION_TYPE
8684 || TREE_CODE (type) == METHOD_TYPE)
8686 error ("function %qs cannot be declared %<mutable%>", name);
8687 storage_class = sc_none;
8691 error ("static %qs cannot be declared %<mutable%>", name);
8692 storage_class = sc_none;
8694 else if (type_quals & TYPE_QUAL_CONST)
8696 error ("const %qs cannot be declared %<mutable%>", name);
8697 storage_class = sc_none;
8701 /* If this is declaring a typedef name, return a TYPE_DECL. */
8702 if (declspecs->specs[(int)ds_typedef] && decl_context != TYPENAME)
8706 /* Note that the grammar rejects storage classes
8707 in typenames, fields or parameters. */
8708 if (current_lang_name == lang_name_java)
8709 TYPE_FOR_JAVA (type) = 1;
8711 /* This declaration:
8713 typedef void f(int) const;
8715 declares a function type which is not a member of any
8716 particular class, but which is cv-qualified; for
8717 example "f S::*" declares a pointer to a const-qualified
8718 member function of S. We record the cv-qualification in the
8720 if (memfn_quals && TREE_CODE (type) == FUNCTION_TYPE)
8722 type = cp_build_qualified_type (type, memfn_quals);
8724 /* We have now dealt with these qualifiers. */
8725 memfn_quals = TYPE_UNQUALIFIED;
8728 if (decl_context == FIELD)
8729 decl = build_lang_decl (TYPE_DECL, unqualified_id, type);
8731 decl = build_decl (TYPE_DECL, unqualified_id, type);
8732 if (id_declarator && declarator->u.id.qualifying_scope) {
8733 error ("%Jtypedef name may not be a nested-name-specifier", decl);
8734 TREE_TYPE (decl) = error_mark_node;
8737 if (decl_context != FIELD)
8739 if (!current_function_decl)
8740 DECL_CONTEXT (decl) = FROB_CONTEXT (current_namespace);
8741 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (current_function_decl)
8742 || (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P
8743 (current_function_decl)))
8744 /* The TYPE_DECL is "abstract" because there will be
8745 clones of this constructor/destructor, and there will
8746 be copies of this TYPE_DECL generated in those
8748 DECL_ABSTRACT (decl) = 1;
8750 else if (constructor_name_p (unqualified_id, current_class_type))
8751 permerror (input_location, "ISO C++ forbids nested type %qD with same name "
8752 "as enclosing class",
8755 /* If the user declares "typedef struct {...} foo" then the
8756 struct will have an anonymous name. Fill that name in now.
8757 Nothing can refer to it, so nothing needs know about the name
8759 if (type != error_mark_node
8762 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
8763 && TYPE_ANONYMOUS_P (type)
8764 && cp_type_quals (type) == TYPE_UNQUALIFIED)
8766 tree oldname = TYPE_NAME (type);
8769 /* Replace the anonymous name with the real name everywhere. */
8770 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
8771 if (TYPE_NAME (t) == oldname)
8772 TYPE_NAME (t) = decl;
8774 if (TYPE_LANG_SPECIFIC (type))
8775 TYPE_WAS_ANONYMOUS (type) = 1;
8777 /* If this is a typedef within a template class, the nested
8778 type is a (non-primary) template. The name for the
8779 template needs updating as well. */
8780 if (TYPE_LANG_SPECIFIC (type) && CLASSTYPE_TEMPLATE_INFO (type))
8781 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type))
8782 = TYPE_IDENTIFIER (type);
8784 /* FIXME remangle member functions; member functions of a
8785 type with external linkage have external linkage. */
8789 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
8790 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
8792 bad_specifiers (decl, "type", virtualp,
8793 memfn_quals != TYPE_UNQUALIFIED,
8794 inlinep, friendp, raises != NULL_TREE);
8799 /* Detect the case of an array type of unspecified size
8800 which came, as such, direct from a typedef name.
8801 We must copy the type, so that the array's domain can be
8802 individually set by the object's initializer. */
8804 if (type && typedef_type
8805 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type)
8806 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
8807 type = build_cplus_array_type (TREE_TYPE (type), NULL_TREE);
8809 /* Detect where we're using a typedef of function type to declare a
8810 function. PARMS will not be set, so we must create it now. */
8812 if (type == typedef_type && TREE_CODE (type) == FUNCTION_TYPE)
8814 tree decls = NULL_TREE;
8817 for (args = TYPE_ARG_TYPES (type); args; args = TREE_CHAIN (args))
8819 tree decl = cp_build_parm_decl (NULL_TREE, TREE_VALUE (args));
8821 TREE_CHAIN (decl) = decls;
8825 parms = nreverse (decls);
8827 if (decl_context != TYPENAME)
8829 /* A cv-qualifier-seq shall only be part of the function type
8830 for a non-static member function. [8.3.5/4 dcl.fct] */
8831 if (cp_type_quals (type) != TYPE_UNQUALIFIED
8832 && (current_class_type == NULL_TREE || staticp) )
8835 ? G_("qualified function types cannot be used to "
8836 "declare static member functions")
8837 : G_("qualified function types cannot be used to "
8838 "declare free functions"));
8839 type = TYPE_MAIN_VARIANT (type);
8842 /* The qualifiers on the function type become the qualifiers on
8843 the non-static member function. */
8844 memfn_quals |= cp_type_quals (type);
8848 /* If this is a type name (such as, in a cast or sizeof),
8849 compute the type and return it now. */
8851 if (decl_context == TYPENAME)
8853 /* Note that the grammar rejects storage classes
8854 in typenames, fields or parameters. */
8855 if (type_quals != TYPE_UNQUALIFIED)
8856 type_quals = TYPE_UNQUALIFIED;
8858 /* Special case: "friend class foo" looks like a TYPENAME context. */
8861 if (type_quals != TYPE_UNQUALIFIED)
8863 error ("type qualifiers specified for friend class declaration");
8864 type_quals = TYPE_UNQUALIFIED;
8868 error ("%<inline%> specified for friend class declaration");
8874 /* Don't allow friend declaration without a class-key. */
8875 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
8876 permerror (input_location, "template parameters cannot be friends");
8877 else if (TREE_CODE (type) == TYPENAME_TYPE)
8878 permerror (input_location, "friend declaration requires class-key, "
8879 "i.e. %<friend class %T::%D%>",
8880 TYPE_CONTEXT (type), TYPENAME_TYPE_FULLNAME (type));
8882 permerror (input_location, "friend declaration requires class-key, "
8883 "i.e. %<friend %#T%>",
8887 /* Only try to do this stuff if we didn't already give up. */
8888 if (type != integer_type_node)
8890 /* A friendly class? */
8891 if (current_class_type)
8892 make_friend_class (current_class_type, TYPE_MAIN_VARIANT (type),
8895 error ("trying to make class %qT a friend of global scope",
8898 type = void_type_node;
8901 else if (memfn_quals)
8903 if (ctype == NULL_TREE)
8905 if (TREE_CODE (type) != METHOD_TYPE)
8906 error ("invalid qualifiers on non-member function type");
8908 ctype = TYPE_METHOD_BASETYPE (type);
8911 type = build_memfn_type (type, ctype, memfn_quals);
8916 else if (unqualified_id == NULL_TREE && decl_context != PARM
8917 && decl_context != CATCHPARM
8918 && TREE_CODE (type) != UNION_TYPE
8921 error ("abstract declarator %qT used as declaration", type);
8922 return error_mark_node;
8925 /* Only functions may be declared using an operator-function-id. */
8927 && IDENTIFIER_OPNAME_P (unqualified_id)
8928 && TREE_CODE (type) != FUNCTION_TYPE
8929 && TREE_CODE (type) != METHOD_TYPE)
8931 error ("declaration of %qD as non-function", unqualified_id);
8932 return error_mark_node;
8935 /* We don't check parameter types here because we can emit a better
8936 error message later. */
8937 if (decl_context != PARM)
8939 type = check_var_type (unqualified_id, type);
8940 if (type == error_mark_node)
8941 return error_mark_node;
8944 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
8945 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
8947 if (decl_context == PARM || decl_context == CATCHPARM)
8949 if (ctype || in_namespace)
8950 error ("cannot use %<::%> in parameter declaration");
8952 /* A parameter declared as an array of T is really a pointer to T.
8953 One declared as a function is really a pointer to a function.
8954 One declared as a member is really a pointer to member. */
8956 if (TREE_CODE (type) == ARRAY_TYPE)
8958 /* Transfer const-ness of array into that of type pointed to. */
8959 type = build_pointer_type (TREE_TYPE (type));
8960 type_quals = TYPE_UNQUALIFIED;
8962 else if (TREE_CODE (type) == FUNCTION_TYPE)
8963 type = build_pointer_type (type);
8969 if (decl_context == PARM)
8971 decl = cp_build_parm_decl (unqualified_id, type);
8973 bad_specifiers (decl, "parameter", virtualp,
8974 memfn_quals != TYPE_UNQUALIFIED,
8975 inlinep, friendp, raises != NULL_TREE);
8977 else if (decl_context == FIELD)
8979 /* The C99 flexible array extension. */
8980 if (!staticp && TREE_CODE (type) == ARRAY_TYPE
8981 && TYPE_DOMAIN (type) == NULL_TREE)
8983 tree itype = compute_array_index_type (dname, integer_zero_node);
8984 type = build_cplus_array_type (TREE_TYPE (type), itype);
8987 if (type == error_mark_node)
8989 /* Happens when declaring arrays of sizes which
8990 are error_mark_node, for example. */
8993 else if (in_namespace && !friendp)
8995 /* Something like struct S { int N::j; }; */
8996 error ("invalid use of %<::%>");
8997 return error_mark_node;
8999 else if (TREE_CODE (type) == FUNCTION_TYPE)
9002 tree function_context;
9006 if (ctype == NULL_TREE)
9007 ctype = current_class_type;
9009 if (ctype == NULL_TREE)
9011 error ("can't make %qD into a method -- not in a class",
9013 return error_mark_node;
9016 /* ``A union may [ ... ] not [ have ] virtual functions.''
9018 if (virtualp && TREE_CODE (ctype) == UNION_TYPE)
9020 error ("function %qD declared virtual inside a union",
9022 return error_mark_node;
9025 if (NEW_DELETE_OPNAME_P (unqualified_id))
9029 error ("%qD cannot be declared virtual, since it "
9035 else if (staticp < 2)
9036 type = build_memfn_type (type, ctype, memfn_quals);
9039 /* Check that the name used for a destructor makes sense. */
9040 if (sfk == sfk_destructor)
9044 gcc_assert (friendp);
9045 error ("expected qualified name in friend declaration "
9046 "for destructor %qD",
9047 id_declarator->u.id.unqualified_name);
9048 return error_mark_node;
9051 if (!same_type_p (TREE_OPERAND
9052 (id_declarator->u.id.unqualified_name, 0),
9055 error ("declaration of %qD as member of %qT",
9056 id_declarator->u.id.unqualified_name, ctype);
9057 return error_mark_node;
9060 else if (sfk == sfk_constructor && friendp)
9062 error ("expected qualified name in friend declaration "
9063 "for constructor %qD",
9064 id_declarator->u.id.unqualified_name);
9065 return error_mark_node;
9068 /* Tell grokfndecl if it needs to set TREE_PUBLIC on the node. */
9069 function_context = (ctype != NULL_TREE) ?
9070 decl_function_context (TYPE_MAIN_DECL (ctype)) : NULL_TREE;
9071 publicp = (! friendp || ! staticp)
9072 && function_context == NULL_TREE;
9073 decl = grokfndecl (ctype, type,
9074 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9075 ? unqualified_id : dname,
9078 virtualp, flags, memfn_quals, raises,
9079 friendp ? -1 : 0, friendp, publicp, inlinep,
9081 funcdef_flag, template_count, in_namespace,
9082 attrlist, declarator->id_loc);
9083 if (decl == NULL_TREE)
9084 return error_mark_node;
9086 /* This clobbers the attrs stored in `decl' from `attrlist'. */
9087 /* The decl and setting of decl_attr is also turned off. */
9088 decl = build_decl_attribute_variant (decl, decl_attr);
9091 /* [class.conv.ctor]
9093 A constructor declared without the function-specifier
9094 explicit that can be called with a single parameter
9095 specifies a conversion from the type of its first
9096 parameter to the type of its class. Such a constructor
9097 is called a converting constructor. */
9099 DECL_NONCONVERTING_P (decl) = 1;
9101 else if (TREE_CODE (type) == METHOD_TYPE)
9103 /* We only get here for friend declarations of
9104 members of other classes. */
9105 /* All method decls are public, so tell grokfndecl to set
9106 TREE_PUBLIC, also. */
9107 decl = grokfndecl (ctype, type,
9108 TREE_CODE (unqualified_id) != TEMPLATE_ID_EXPR
9109 ? unqualified_id : dname,
9112 virtualp, flags, memfn_quals, raises,
9113 friendp ? -1 : 0, friendp, 1, 0, sfk,
9114 funcdef_flag, template_count, in_namespace,
9116 declarator->id_loc);
9117 if (decl == NULL_TREE)
9118 return error_mark_node;
9120 else if (!staticp && !dependent_type_p (type)
9121 && !COMPLETE_TYPE_P (complete_type (type))
9122 && (TREE_CODE (type) != ARRAY_TYPE || initialized == 0))
9125 error ("field %qD has incomplete type", unqualified_id);
9127 error ("name %qT has incomplete type", type);
9129 /* If we're instantiating a template, tell them which
9130 instantiation made the field's type be incomplete. */
9131 if (current_class_type
9132 && TYPE_NAME (current_class_type)
9133 && IDENTIFIER_TEMPLATE (TYPE_IDENTIFIER (current_class_type))
9135 && declspecs->type == type)
9136 error (" in instantiation of template %qT",
9137 current_class_type);
9139 return error_mark_node;
9145 error ("%qE is neither function nor member function; "
9146 "cannot be declared friend", unqualified_id);
9154 /* Friends are treated specially. */
9155 if (ctype == current_class_type)
9156 ; /* We already issued a permerror. */
9157 else if (decl && DECL_NAME (decl))
9159 if (template_class_depth (current_class_type) == 0)
9161 decl = check_explicit_specialization
9162 (unqualified_id, decl, template_count,
9163 2 * funcdef_flag + 4);
9164 if (decl == error_mark_node)
9165 return error_mark_node;
9168 decl = do_friend (ctype, unqualified_id, decl,
9174 return error_mark_node;
9177 /* Structure field. It may not be a function, except for C++. */
9179 if (decl == NULL_TREE)
9185 /* An attempt is being made to initialize a non-static
9186 member. But, from [class.mem]:
9188 4 A member-declarator can contain a
9189 constant-initializer only if it declares a static
9190 member (_class.static_) of integral or enumeration
9191 type, see _class.static.data_.
9193 This used to be relatively common practice, but
9194 the rest of the compiler does not correctly
9195 handle the initialization unless the member is
9196 static so we make it static below. */
9197 permerror (input_location, "ISO C++ forbids initialization of member %qD",
9199 permerror (input_location, "making %qD static", unqualified_id);
9203 if (uses_template_parms (type))
9204 /* We'll check at instantiation time. */
9206 else if (check_static_variable_definition (unqualified_id,
9208 /* If we just return the declaration, crashes
9209 will sometimes occur. We therefore return
9210 void_type_node, as if this was a friend
9211 declaration, to cause callers to completely
9212 ignore this declaration. */
9213 return error_mark_node;
9218 /* C++ allows static class members. All other work
9219 for this is done by grokfield. */
9220 decl = build_lang_decl (VAR_DECL, unqualified_id, type);
9221 set_linkage_for_static_data_member (decl);
9222 /* Even if there is an in-class initialization, DECL
9223 is considered undefined until an out-of-class
9224 definition is provided. */
9225 DECL_EXTERNAL (decl) = 1;
9228 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
9232 decl = build_decl (FIELD_DECL, unqualified_id, type);
9233 DECL_NONADDRESSABLE_P (decl) = bitfield;
9234 if (bitfield && !unqualified_id)
9235 TREE_NO_WARNING (decl) = 1;
9237 if (storage_class == sc_mutable)
9239 DECL_MUTABLE_P (decl) = 1;
9240 storage_class = sc_none;
9244 bad_specifiers (decl, "field", virtualp,
9245 memfn_quals != TYPE_UNQUALIFIED,
9246 inlinep, friendp, raises != NULL_TREE);
9249 else if (TREE_CODE (type) == FUNCTION_TYPE
9250 || TREE_CODE (type) == METHOD_TYPE)
9255 if (!unqualified_id)
9256 return error_mark_node;
9258 if (TREE_CODE (unqualified_id) == TEMPLATE_ID_EXPR)
9259 original_name = dname;
9261 original_name = unqualified_id;
9263 if (storage_class == sc_auto)
9264 error ("storage class %<auto%> invalid for function %qs", name);
9265 else if (storage_class == sc_register)
9266 error ("storage class %<register%> invalid for function %qs", name);
9268 error ("storage class %<__thread%> invalid for function %qs", name);
9270 /* Function declaration not at top level.
9271 Storage classes other than `extern' are not allowed
9272 and `extern' makes no difference. */
9273 if (! toplevel_bindings_p ()
9274 && (storage_class == sc_static
9275 || declspecs->specs[(int)ds_inline])
9278 if (storage_class == sc_static)
9279 pedwarn (input_location, OPT_pedantic,
9280 "%<static%> specified invalid for function %qs "
9281 "declared out of global scope", name);
9283 pedwarn (input_location, OPT_pedantic,
9284 "%<inline%> specifier invalid for function %qs "
9285 "declared out of global scope", name);
9288 if (ctype != NULL_TREE
9289 && TREE_CODE (ctype) != NAMESPACE_DECL && !MAYBE_CLASS_TYPE_P (ctype))
9291 error ("%q#T is not a class or a namespace", ctype);
9295 if (ctype == NULL_TREE)
9299 error ("virtual non-class function %qs", name);
9303 else if (TREE_CODE (type) == FUNCTION_TYPE && staticp < 2
9304 && !NEW_DELETE_OPNAME_P (original_name))
9305 type = build_method_type_directly (ctype,
9307 TYPE_ARG_TYPES (type));
9309 /* Record presence of `static'. */
9310 publicp = (ctype != NULL_TREE
9311 || storage_class == sc_extern
9312 || storage_class != sc_static);
9314 decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
9315 virtualp, flags, memfn_quals, raises,
9317 publicp, inlinep, sfk, funcdef_flag,
9318 template_count, in_namespace, attrlist,
9319 declarator->id_loc);
9320 if (decl == NULL_TREE)
9321 return error_mark_node;
9325 int invalid_static = 0;
9327 /* Don't allow a static member function in a class, and forbid
9328 declaring main to be static. */
9329 if (TREE_CODE (type) == METHOD_TYPE)
9331 permerror (input_location, "cannot declare member function %qD to have "
9332 "static linkage", decl);
9335 else if (current_function_decl)
9337 /* FIXME need arm citation */
9338 error ("cannot declare static function inside another function");
9345 storage_class = sc_none;
9351 /* It's a variable. */
9353 /* An uninitialized decl with `extern' is a reference. */
9354 decl = grokvardecl (type, unqualified_id,
9357 (type_quals & TYPE_QUAL_CONST) != 0,
9358 ctype ? ctype : in_namespace);
9359 bad_specifiers (decl, "variable", virtualp,
9360 memfn_quals != TYPE_UNQUALIFIED,
9361 inlinep, friendp, raises != NULL_TREE);
9365 DECL_CONTEXT (decl) = ctype;
9368 permerror (input_location, "%<static%> may not be used when defining "
9369 "(as opposed to declaring) a static data member");
9371 storage_class = sc_none;
9373 if (storage_class == sc_register && TREE_STATIC (decl))
9375 error ("static member %qD declared %<register%>", decl);
9376 storage_class = sc_none;
9378 if (storage_class == sc_extern && pedantic)
9380 pedwarn (input_location, OPT_pedantic,
9381 "cannot explicitly declare member %q#D to have "
9382 "extern linkage", decl);
9383 storage_class = sc_none;
9388 if (storage_class == sc_extern && initialized && !funcdef_flag)
9390 if (toplevel_bindings_p ())
9392 /* It's common practice (and completely valid) to have a const
9393 be initialized and declared extern. */
9394 if (!(type_quals & TYPE_QUAL_CONST))
9395 warning (0, "%qs initialized and declared %<extern%>", name);
9399 error ("%qs has both %<extern%> and initializer", name);
9400 return error_mark_node;
9404 /* Record `register' declaration for warnings on &
9405 and in case doing stupid register allocation. */
9407 if (storage_class == sc_register)
9408 DECL_REGISTER (decl) = 1;
9409 else if (storage_class == sc_extern)
9410 DECL_THIS_EXTERN (decl) = 1;
9411 else if (storage_class == sc_static)
9412 DECL_THIS_STATIC (decl) = 1;
9414 /* Record constancy and volatility on the DECL itself . There's
9415 no need to do this when processing a template; we'll do this
9416 for the instantiated declaration based on the type of DECL. */
9417 if (!processing_template_decl)
9418 cp_apply_type_quals_to_decl (type_quals, decl);
9421 TREE_NO_WARNING (decl) = 1;
9427 /* Subroutine of start_function. Ensure that each of the parameter
9428 types (as listed in PARMS) is complete, as is required for a
9429 function definition. */
9432 require_complete_types_for_parms (tree parms)
9434 for (; parms; parms = TREE_CHAIN (parms))
9436 if (dependent_type_p (TREE_TYPE (parms)))
9438 if (!VOID_TYPE_P (TREE_TYPE (parms))
9439 && complete_type_or_else (TREE_TYPE (parms), parms))
9441 relayout_decl (parms);
9442 DECL_ARG_TYPE (parms) = type_passed_as (TREE_TYPE (parms));
9445 /* grokparms or complete_type_or_else will have already issued
9447 TREE_TYPE (parms) = error_mark_node;
9451 /* Returns nonzero if T is a local variable. */
9454 local_variable_p (const_tree t)
9456 if ((TREE_CODE (t) == VAR_DECL
9457 /* A VAR_DECL with a context that is a _TYPE is a static data
9459 && !TYPE_P (CP_DECL_CONTEXT (t))
9460 /* Any other non-local variable must be at namespace scope. */
9461 && !DECL_NAMESPACE_SCOPE_P (t))
9462 || (TREE_CODE (t) == PARM_DECL))
9468 /* Like local_variable_p, but suitable for use as a tree-walking
9472 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
9473 void *data ATTRIBUTE_UNUSED)
9475 if (local_variable_p (*tp) && !DECL_ARTIFICIAL (*tp))
9477 else if (TYPE_P (*tp))
9484 /* Check that ARG, which is a default-argument expression for a
9485 parameter DECL, is valid. Returns ARG, or ERROR_MARK_NODE, if
9486 something goes wrong. DECL may also be a _TYPE node, rather than a
9487 DECL, if there is no DECL available. */
9490 check_default_argument (tree decl, tree arg)
9495 if (TREE_CODE (arg) == DEFAULT_ARG)
9496 /* We get a DEFAULT_ARG when looking at an in-class declaration
9497 with a default argument. Ignore the argument for now; we'll
9498 deal with it after the class is complete. */
9507 decl_type = TREE_TYPE (decl);
9509 if (arg == error_mark_node
9510 || decl == error_mark_node
9511 || TREE_TYPE (arg) == error_mark_node
9512 || decl_type == error_mark_node)
9513 /* Something already went wrong. There's no need to check
9515 return error_mark_node;
9517 /* [dcl.fct.default]
9519 A default argument expression is implicitly converted to the
9521 if (!TREE_TYPE (arg)
9522 || !can_convert_arg (decl_type, TREE_TYPE (arg), arg, LOOKUP_NORMAL))
9525 error ("default argument for %q#D has type %qT",
9526 decl, TREE_TYPE (arg));
9528 error ("default argument for parameter of type %qT has type %qT",
9529 decl_type, TREE_TYPE (arg));
9531 return error_mark_node;
9534 /* [dcl.fct.default]
9536 Local variables shall not be used in default argument
9539 The keyword `this' shall not be used in a default argument of a
9541 var = cp_walk_tree_without_duplicates (&arg, local_variable_p_walkfn, NULL);
9544 error ("default argument %qE uses local variable %qD", arg, var);
9545 return error_mark_node;
9552 /* Returns a deprecated type used within TYPE, or NULL_TREE if none. */
9555 type_is_deprecated (tree type)
9557 enum tree_code code;
9558 if (TREE_DEPRECATED (type))
9560 if (TYPE_NAME (type)
9561 && TREE_DEPRECATED (TYPE_NAME (type)))
9564 code = TREE_CODE (type);
9566 if (code == POINTER_TYPE || code == REFERENCE_TYPE
9567 || code == OFFSET_TYPE || code == FUNCTION_TYPE
9568 || code == METHOD_TYPE || code == ARRAY_TYPE)
9569 return type_is_deprecated (TREE_TYPE (type));
9571 if (TYPE_PTRMEMFUNC_P (type))
9572 return type_is_deprecated
9573 (TREE_TYPE (TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (type))));
9578 /* Decode the list of parameter types for a function type.
9579 Given the list of things declared inside the parens,
9580 return a list of types.
9582 If this parameter does not end with an ellipsis, we append
9585 *PARMS is set to the chain of PARM_DECLs created. */
9588 grokparms (tree parmlist, tree *parms)
9590 tree result = NULL_TREE;
9591 tree decls = NULL_TREE;
9595 for (parm = parmlist; parm != NULL_TREE; parm = TREE_CHAIN (parm))
9597 tree type = NULL_TREE;
9598 tree init = TREE_PURPOSE (parm);
9599 tree decl = TREE_VALUE (parm);
9601 if (parm == void_list_node)
9604 if (! decl || TREE_TYPE (decl) == error_mark_node)
9607 type = TREE_TYPE (decl);
9608 if (VOID_TYPE_P (type))
9610 if (same_type_p (type, void_type_node)
9611 && DECL_SELF_REFERENCE_P (type)
9612 && !DECL_NAME (decl) && !result && TREE_CHAIN (parm) == void_list_node)
9613 /* this is a parmlist of `(void)', which is ok. */
9615 cxx_incomplete_type_error (decl, type);
9616 /* It's not a good idea to actually create parameters of
9617 type `void'; other parts of the compiler assume that a
9618 void type terminates the parameter list. */
9619 type = error_mark_node;
9620 TREE_TYPE (decl) = error_mark_node;
9623 if (type != error_mark_node
9624 && TYPE_FOR_JAVA (type)
9625 && MAYBE_CLASS_TYPE_P (type))
9627 error ("parameter %qD has Java class type", decl);
9628 type = error_mark_node;
9629 TREE_TYPE (decl) = error_mark_node;
9633 if (type != error_mark_node)
9635 if (deprecated_state != DEPRECATED_SUPPRESS)
9637 tree deptype = type_is_deprecated (type);
9639 warn_deprecated_use (deptype);
9642 /* Top-level qualifiers on the parameters are
9643 ignored for function types. */
9644 type = cp_build_qualified_type (type, 0);
9645 if (TREE_CODE (type) == METHOD_TYPE)
9647 error ("parameter %qD invalidly declared method type", decl);
9648 type = build_pointer_type (type);
9649 TREE_TYPE (decl) = type;
9651 else if (abstract_virtuals_error (decl, type))
9652 any_error = 1; /* Seems like a good idea. */
9653 else if (POINTER_TYPE_P (type))
9655 /* [dcl.fct]/6, parameter types cannot contain pointers
9656 (references) to arrays of unknown bound. */
9657 tree t = TREE_TYPE (type);
9658 int ptr = TYPE_PTR_P (type);
9664 else if (TREE_CODE (t) != ARRAY_TYPE)
9666 else if (!TYPE_DOMAIN (t))
9670 if (TREE_CODE (t) == ARRAY_TYPE)
9671 error ("parameter %qD includes %s to array of unknown "
9673 decl, ptr ? "pointer" : "reference", t);
9678 else if (init && !processing_template_decl)
9679 init = check_default_argument (decl, init);
9682 if (TREE_CODE (decl) == PARM_DECL
9683 && FUNCTION_PARAMETER_PACK_P (decl)
9684 && TREE_CHAIN (parm)
9685 && TREE_CHAIN (parm) != void_list_node)
9686 error ("parameter packs must be at the end of the parameter list");
9688 TREE_CHAIN (decl) = decls;
9690 result = tree_cons (init, type, result);
9692 decls = nreverse (decls);
9693 result = nreverse (result);
9695 result = chainon (result, void_list_node);
9702 /* D is a constructor or overloaded `operator='.
9704 Let T be the class in which D is declared. Then, this function
9707 -1 if D's is an ill-formed constructor or copy assignment operator
9708 whose first parameter is of type `T'.
9709 0 if D is not a copy constructor or copy assignment
9711 1 if D is a copy constructor or copy assignment operator whose
9712 first parameter is a reference to const qualified T.
9713 2 if D is a copy constructor or copy assignment operator whose
9714 first parameter is a reference to non-const qualified T.
9716 This function can be used as a predicate. Positive values indicate
9717 a copy constructor and nonzero values indicate a copy assignment
9721 copy_fn_p (const_tree d)
9727 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9729 if (TREE_CODE (d) == TEMPLATE_DECL
9730 || (DECL_TEMPLATE_INFO (d)
9731 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9732 /* Instantiations of template member functions are never copy
9733 functions. Note that member functions of templated classes are
9734 represented as template functions internally, and we must
9735 accept those as copy functions. */
9738 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9742 arg_type = TREE_VALUE (args);
9743 if (arg_type == error_mark_node)
9746 if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
9748 /* Pass by value copy assignment operator. */
9751 else if (TREE_CODE (arg_type) == REFERENCE_TYPE
9752 && !TYPE_REF_IS_RVALUE (arg_type)
9753 && TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
9755 if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
9761 args = TREE_CHAIN (args);
9763 if (args && args != void_list_node && !TREE_PURPOSE (args))
9764 /* There are more non-optional args. */
9770 /* D is a constructor or overloaded `operator='.
9772 Let T be the class in which D is declared. Then, this function
9773 returns true when D is a move constructor or move assignment
9774 operator, false otherwise. */
9777 move_fn_p (const_tree d)
9781 bool result = false;
9783 gcc_assert (DECL_FUNCTION_MEMBER_P (d));
9785 if (cxx_dialect == cxx98)
9786 /* There are no move constructors if we are in C++98 mode. */
9789 if (TREE_CODE (d) == TEMPLATE_DECL
9790 || (DECL_TEMPLATE_INFO (d)
9791 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (d))))
9792 /* Instantiations of template member functions are never copy
9793 functions. Note that member functions of templated classes are
9794 represented as template functions internally, and we must
9795 accept those as copy functions. */
9798 args = FUNCTION_FIRST_USER_PARMTYPE (d);
9802 arg_type = TREE_VALUE (args);
9803 if (arg_type == error_mark_node)
9806 if (TREE_CODE (arg_type) == REFERENCE_TYPE
9807 && TYPE_REF_IS_RVALUE (arg_type)
9808 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)),
9812 args = TREE_CHAIN (args);
9814 if (args && args != void_list_node && !TREE_PURPOSE (args))
9815 /* There are more non-optional args. */
9821 /* Remember any special properties of member function DECL. */
9824 grok_special_member_properties (tree decl)
9828 if (!DECL_NONSTATIC_MEMBER_FUNCTION_P (decl))
9831 class_type = DECL_CONTEXT (decl);
9832 if (DECL_CONSTRUCTOR_P (decl))
9834 int ctor = copy_fn_p (decl);
9836 if (!DECL_ARTIFICIAL (decl))
9837 TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
9843 A non-template constructor for class X is a copy
9844 constructor if its first parameter is of type X&, const
9845 X&, volatile X& or const volatile X&, and either there
9846 are no other parameters or else all other parameters have
9847 default arguments. */
9848 TYPE_HAS_INIT_REF (class_type) = 1;
9849 if (!DECL_DEFAULTED_FN (decl))
9850 TYPE_HAS_COMPLEX_INIT_REF (class_type) = 1;
9852 TYPE_HAS_CONST_INIT_REF (class_type) = 1;
9854 else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
9856 TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
9857 if (TREE_CODE (decl) == TEMPLATE_DECL || !DECL_DEFAULTED_FN (decl))
9858 TYPE_HAS_COMPLEX_DFLT (class_type) = 1;
9860 else if (is_list_ctor (decl))
9861 TYPE_HAS_LIST_CTOR (class_type) = 1;
9863 else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
9867 A non-template assignment operator for class X is a copy
9868 assignment operator if its parameter is of type X, X&, const
9869 X&, volatile X& or const volatile X&. */
9871 int assop = copy_fn_p (decl);
9875 TYPE_HAS_ASSIGN_REF (class_type) = 1;
9876 if (!DECL_DEFAULTED_FN (decl))
9877 TYPE_HAS_COMPLEX_ASSIGN_REF (class_type) = 1;
9879 TYPE_HAS_CONST_ASSIGN_REF (class_type) = 1;
9884 /* Check a constructor DECL has the correct form. Complains
9885 if the class has a constructor of the form X(X). */
9888 grok_ctor_properties (const_tree ctype, const_tree decl)
9890 int ctor_parm = copy_fn_p (decl);
9896 A declaration of a constructor for a class X is ill-formed if
9897 its first parameter is of type (optionally cv-qualified) X
9898 and either there are no other parameters or else all other
9899 parameters have default arguments.
9901 We *don't* complain about member template instantiations that
9902 have this form, though; they can occur as we try to decide
9903 what constructor to use during overload resolution. Since
9904 overload resolution will never prefer such a constructor to
9905 the non-template copy constructor (which is either explicitly
9906 or implicitly defined), there's no need to worry about their
9907 existence. Theoretically, they should never even be
9908 instantiated, but that's hard to forestall. */
9909 error ("invalid constructor; you probably meant %<%T (const %T&)%>",
9917 /* An operator with this code is unary, but can also be binary. */
9920 ambi_op_p (enum tree_code code)
9922 return (code == INDIRECT_REF
9923 || code == ADDR_EXPR
9924 || code == UNARY_PLUS_EXPR
9925 || code == NEGATE_EXPR
9926 || code == PREINCREMENT_EXPR
9927 || code == PREDECREMENT_EXPR);
9930 /* An operator with this name can only be unary. */
9933 unary_op_p (enum tree_code code)
9935 return (code == TRUTH_NOT_EXPR
9936 || code == BIT_NOT_EXPR
9937 || code == COMPONENT_REF
9938 || code == TYPE_EXPR);
9941 /* DECL is a declaration for an overloaded operator. If COMPLAIN is true,
9942 errors are issued for invalid declarations. */
9945 grok_op_properties (tree decl, bool complain)
9947 tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
9949 int methodp = (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
9950 tree name = DECL_NAME (decl);
9951 enum tree_code operator_code;
9956 /* Count the number of arguments and check for ellipsis. */
9957 for (argtype = argtypes, arity = 0;
9958 argtype && argtype != void_list_node;
9959 argtype = TREE_CHAIN (argtype))
9961 ellipsis_p = !argtype;
9963 class_type = DECL_CONTEXT (decl);
9964 if (class_type && !CLASS_TYPE_P (class_type))
9965 class_type = NULL_TREE;
9967 if (DECL_CONV_FN_P (decl))
9968 operator_code = TYPE_EXPR;
9972 #define DEF_OPERATOR(NAME, CODE, MANGLING, ARITY, ASSN_P) \
9973 if (ansi_opname (CODE) == name) \
9975 operator_code = (CODE); \
9978 else if (ansi_assopname (CODE) == name) \
9980 operator_code = (CODE); \
9981 DECL_ASSIGNMENT_OPERATOR_P (decl) = 1; \
9985 #include "operators.def"
9991 gcc_assert (operator_code != MAX_TREE_CODES);
9992 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
9995 switch (operator_code)
9998 TYPE_HAS_NEW_OPERATOR (class_type) = 1;
10002 TYPE_GETS_DELETE (class_type) |= 1;
10006 TYPE_HAS_ARRAY_NEW_OPERATOR (class_type) = 1;
10009 case VEC_DELETE_EXPR:
10010 TYPE_GETS_DELETE (class_type) |= 2;
10017 /* [basic.std.dynamic.allocation]/1:
10019 A program is ill-formed if an allocation function is declared
10020 in a namespace scope other than global scope or declared static
10023 The same also holds true for deallocation functions. */
10024 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR
10025 || operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10027 if (DECL_NAMESPACE_SCOPE_P (decl))
10029 if (CP_DECL_CONTEXT (decl) != global_namespace)
10031 error ("%qD may not be declared within a namespace", decl);
10034 else if (!TREE_PUBLIC (decl))
10036 error ("%qD may not be declared as static", decl);
10042 if (operator_code == NEW_EXPR || operator_code == VEC_NEW_EXPR)
10044 TREE_TYPE (decl) = coerce_new_type (TREE_TYPE (decl));
10045 DECL_IS_OPERATOR_NEW (decl) = 1;
10047 else if (operator_code == DELETE_EXPR || operator_code == VEC_DELETE_EXPR)
10048 TREE_TYPE (decl) = coerce_delete_type (TREE_TYPE (decl));
10051 /* An operator function must either be a non-static member function
10052 or have at least one parameter of a class, a reference to a class,
10053 an enumeration, or a reference to an enumeration. 13.4.0.6 */
10054 if (! methodp || DECL_STATIC_FUNCTION_P (decl))
10056 if (operator_code == TYPE_EXPR
10057 || operator_code == CALL_EXPR
10058 || operator_code == COMPONENT_REF
10059 || operator_code == ARRAY_REF
10060 || operator_code == NOP_EXPR)
10062 error ("%qD must be a nonstatic member function", decl);
10069 if (DECL_STATIC_FUNCTION_P (decl))
10071 error ("%qD must be either a non-static member "
10072 "function or a non-member function", decl);
10076 for (p = argtypes; p && p != void_list_node; p = TREE_CHAIN (p))
10078 tree arg = non_reference (TREE_VALUE (p));
10079 if (arg == error_mark_node)
10082 /* MAYBE_CLASS_TYPE_P, rather than CLASS_TYPE_P, is used
10083 because these checks are performed even on
10084 template functions. */
10085 if (MAYBE_CLASS_TYPE_P (arg)
10086 || TREE_CODE (arg) == ENUMERAL_TYPE)
10090 if (!p || p == void_list_node)
10093 error ("%qD must have an argument of class or "
10094 "enumerated type", decl);
10100 /* There are no restrictions on the arguments to an overloaded
10102 if (operator_code == CALL_EXPR)
10105 /* Warn about conversion operators that will never be used. */
10106 if (IDENTIFIER_TYPENAME_P (name)
10107 && ! DECL_TEMPLATE_INFO (decl)
10109 /* Warn only declaring the function; there is no need to
10110 warn again about out-of-class definitions. */
10111 && class_type == current_class_type)
10113 tree t = TREE_TYPE (name);
10114 int ref = (TREE_CODE (t) == REFERENCE_TYPE);
10115 const char *what = 0;
10118 t = TYPE_MAIN_VARIANT (TREE_TYPE (t));
10120 if (TREE_CODE (t) == VOID_TYPE)
10122 else if (class_type)
10124 if (t == class_type)
10125 what = "the same type";
10126 /* Don't force t to be complete here. */
10127 else if (MAYBE_CLASS_TYPE_P (t)
10128 && COMPLETE_TYPE_P (t)
10129 && DERIVED_FROM_P (t, class_type))
10130 what = "a base class";
10134 warning (OPT_Wconversion, "conversion to %s%s will never use a type "
10135 "conversion operator",
10136 ref ? "a reference to " : "", what);
10139 if (operator_code == COND_EXPR)
10142 error ("ISO C++ prohibits overloading operator ?:");
10145 else if (ellipsis_p)
10147 error ("%qD must not have variable number of arguments", decl);
10150 else if (ambi_op_p (operator_code))
10153 /* We pick the one-argument operator codes by default, so
10154 we don't have to change anything. */
10156 else if (arity == 2)
10158 /* If we thought this was a unary operator, we now know
10159 it to be a binary operator. */
10160 switch (operator_code)
10163 operator_code = MULT_EXPR;
10167 operator_code = BIT_AND_EXPR;
10170 case UNARY_PLUS_EXPR:
10171 operator_code = PLUS_EXPR;
10175 operator_code = MINUS_EXPR;
10178 case PREINCREMENT_EXPR:
10179 operator_code = POSTINCREMENT_EXPR;
10182 case PREDECREMENT_EXPR:
10183 operator_code = POSTDECREMENT_EXPR;
10187 gcc_unreachable ();
10190 SET_OVERLOADED_OPERATOR_CODE (decl, operator_code);
10192 if ((operator_code == POSTINCREMENT_EXPR
10193 || operator_code == POSTDECREMENT_EXPR)
10194 && ! processing_template_decl
10195 && ! same_type_p (TREE_VALUE (TREE_CHAIN (argtypes)), integer_type_node))
10198 error ("postfix %qD must take %<int%> as its argument",
10201 error ("postfix %qD must take %<int%> as its second "
10209 error ("%qD must take either zero or one argument", decl);
10211 error ("%qD must take either one or two arguments", decl);
10215 /* More Effective C++ rule 6. */
10217 && (operator_code == POSTINCREMENT_EXPR
10218 || operator_code == POSTDECREMENT_EXPR
10219 || operator_code == PREINCREMENT_EXPR
10220 || operator_code == PREDECREMENT_EXPR))
10222 tree arg = TREE_VALUE (argtypes);
10223 tree ret = TREE_TYPE (TREE_TYPE (decl));
10224 if (methodp || TREE_CODE (arg) == REFERENCE_TYPE)
10225 arg = TREE_TYPE (arg);
10226 arg = TYPE_MAIN_VARIANT (arg);
10227 if (operator_code == PREINCREMENT_EXPR
10228 || operator_code == PREDECREMENT_EXPR)
10230 if (TREE_CODE (ret) != REFERENCE_TYPE
10231 || !same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (ret)),
10233 warning (OPT_Weffc__, "prefix %qD should return %qT", decl,
10234 build_reference_type (arg));
10238 if (!same_type_p (TYPE_MAIN_VARIANT (ret), arg))
10239 warning (OPT_Weffc__, "postfix %qD should return %qT", decl, arg);
10243 else if (unary_op_p (operator_code))
10248 error ("%qD must take %<void%>", decl);
10250 error ("%qD must take exactly one argument", decl);
10254 else /* if (binary_op_p (operator_code)) */
10259 error ("%qD must take exactly one argument", decl);
10261 error ("%qD must take exactly two arguments", decl);
10265 /* More Effective C++ rule 7. */
10267 && (operator_code == TRUTH_ANDIF_EXPR
10268 || operator_code == TRUTH_ORIF_EXPR
10269 || operator_code == COMPOUND_EXPR))
10270 warning (OPT_Weffc__, "user-defined %qD always evaluates both arguments",
10274 /* Effective C++ rule 23. */
10277 && !DECL_ASSIGNMENT_OPERATOR_P (decl)
10278 && (operator_code == PLUS_EXPR
10279 || operator_code == MINUS_EXPR
10280 || operator_code == TRUNC_DIV_EXPR
10281 || operator_code == MULT_EXPR
10282 || operator_code == TRUNC_MOD_EXPR)
10283 && TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
10284 warning (OPT_Weffc__, "%qD should return by value", decl);
10286 /* [over.oper]/8 */
10287 for (; argtypes && argtypes != void_list_node;
10288 argtypes = TREE_CHAIN (argtypes))
10289 if (TREE_PURPOSE (argtypes))
10291 TREE_PURPOSE (argtypes) = NULL_TREE;
10292 if (operator_code == POSTINCREMENT_EXPR
10293 || operator_code == POSTDECREMENT_EXPR)
10295 pedwarn (input_location, OPT_pedantic, "%qD cannot have default arguments",
10300 error ("%qD cannot have default arguments", decl);
10308 /* Return a string giving the keyword associate with CODE. */
10310 static const char *
10311 tag_name (enum tag_types code)
10323 case typename_type:
10326 gcc_unreachable ();
10330 /* Name lookup in an elaborated-type-specifier (after the keyword
10331 indicated by TAG_CODE) has found the TYPE_DECL DECL. If the
10332 elaborated-type-specifier is invalid, issue a diagnostic and return
10333 error_mark_node; otherwise, return the *_TYPE to which it referred.
10334 If ALLOW_TEMPLATE_P is true, TYPE may be a class template. */
10337 check_elaborated_type_specifier (enum tag_types tag_code,
10339 bool allow_template_p)
10345 struct S { struct S *p; };
10347 name lookup will find the TYPE_DECL for the implicit "S::S"
10348 typedef. Adjust for that here. */
10349 if (DECL_SELF_REFERENCE_P (decl))
10350 decl = TYPE_NAME (TREE_TYPE (decl));
10352 type = TREE_TYPE (decl);
10354 /* Check TEMPLATE_TYPE_PARM first because DECL_IMPLICIT_TYPEDEF_P
10355 is false for this case as well. */
10356 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM)
10358 error ("using template type parameter %qT after %qs",
10359 type, tag_name (tag_code));
10360 return error_mark_node;
10364 If the identifier resolves to a typedef-name or a template
10365 type-parameter, the elaborated-type-specifier is ill-formed.
10367 In other words, the only legitimate declaration to use in the
10368 elaborated type specifier is the implicit typedef created when
10369 the type is declared. */
10370 else if (!DECL_IMPLICIT_TYPEDEF_P (decl)
10371 && tag_code != typename_type)
10373 error ("using typedef-name %qD after %qs", decl, tag_name (tag_code));
10374 error ("%q+D has a previous declaration here", decl);
10375 return error_mark_node;
10377 else if (TREE_CODE (type) != RECORD_TYPE
10378 && TREE_CODE (type) != UNION_TYPE
10379 && tag_code != enum_type
10380 && tag_code != typename_type)
10382 error ("%qT referred to as %qs", type, tag_name (tag_code));
10383 error ("%q+T has a previous declaration here", type);
10384 return error_mark_node;
10386 else if (TREE_CODE (type) != ENUMERAL_TYPE
10387 && tag_code == enum_type)
10389 error ("%qT referred to as enum", type);
10390 error ("%q+T has a previous declaration here", type);
10391 return error_mark_node;
10393 else if (!allow_template_p
10394 && TREE_CODE (type) == RECORD_TYPE
10395 && CLASSTYPE_IS_TEMPLATE (type))
10397 /* If a class template appears as elaborated type specifier
10398 without a template header such as:
10400 template <class T> class C {};
10401 void f(class C); // No template header here
10403 then the required template argument is missing. */
10404 error ("template argument required for %<%s %T%>",
10405 tag_name (tag_code),
10406 DECL_NAME (CLASSTYPE_TI_TEMPLATE (type)));
10407 return error_mark_node;
10413 /* Lookup NAME in elaborate type specifier in scope according to
10414 SCOPE and issue diagnostics if necessary.
10415 Return *_TYPE node upon success, NULL_TREE when the NAME is not
10416 found, and ERROR_MARK_NODE for type error. */
10419 lookup_and_check_tag (enum tag_types tag_code, tree name,
10420 tag_scope scope, bool template_header_p)
10424 if (scope == ts_global)
10426 /* First try ordinary name lookup, ignoring hidden class name
10427 injected via friend declaration. */
10428 decl = lookup_name_prefer_type (name, 2);
10429 /* If that fails, the name will be placed in the smallest
10430 non-class, non-function-prototype scope according to 3.3.1/5.
10431 We may already have a hidden name declared as friend in this
10432 scope. So lookup again but not ignoring hidden names.
10433 If we find one, that name will be made visible rather than
10434 creating a new tag. */
10436 decl = lookup_type_scope (name, ts_within_enclosing_non_class);
10439 decl = lookup_type_scope (name, scope);
10441 if (decl && DECL_CLASS_TEMPLATE_P (decl))
10442 decl = DECL_TEMPLATE_RESULT (decl);
10444 if (decl && TREE_CODE (decl) == TYPE_DECL)
10446 /* Look for invalid nested type:
10450 if (scope == ts_current && DECL_SELF_REFERENCE_P (decl))
10452 error ("%qD has the same name as the class in which it is "
10455 return error_mark_node;
10458 /* Two cases we need to consider when deciding if a class
10459 template is allowed as an elaborated type specifier:
10460 1. It is a self reference to its own class.
10461 2. It comes with a template header.
10465 template <class T> class C {
10466 class C *c1; // DECL_SELF_REFERENCE_P is true
10469 template <class U> class C; // template_header_p is true
10470 template <class T> class C<T>::D {
10471 class C *c2; // DECL_SELF_REFERENCE_P is true
10474 t = check_elaborated_type_specifier (tag_code,
10477 | DECL_SELF_REFERENCE_P (decl));
10480 else if (decl && TREE_CODE (decl) == TREE_LIST)
10482 error ("reference to %qD is ambiguous", name);
10483 print_candidates (decl);
10484 return error_mark_node;
10490 /* Get the struct, enum or union (TAG_CODE says which) with tag NAME.
10491 Define the tag as a forward-reference if it is not defined.
10493 If a declaration is given, process it here, and report an error if
10494 multiple declarations are not identical.
10496 SCOPE is TS_CURRENT when this is also a definition. Only look in
10497 the current frame for the name (since C++ allows new names in any
10498 scope.) It is TS_WITHIN_ENCLOSING_NON_CLASS if this is a friend
10499 declaration. Only look beginning from the current scope outward up
10500 till the nearest non-class scope. Otherwise it is TS_GLOBAL.
10502 TEMPLATE_HEADER_P is true when this declaration is preceded by
10503 a set of template parameters. */
10506 xref_tag (enum tag_types tag_code, tree name,
10507 tag_scope scope, bool template_header_p)
10509 enum tree_code code;
10511 tree context = NULL_TREE;
10513 timevar_push (TV_NAME_LOOKUP);
10515 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10521 code = RECORD_TYPE;
10527 code = ENUMERAL_TYPE;
10530 gcc_unreachable ();
10533 /* In case of anonymous name, xref_tag is only called to
10534 make type node and push name. Name lookup is not required. */
10535 if (ANON_AGGRNAME_P (name))
10538 t = lookup_and_check_tag (tag_code, name,
10539 scope, template_header_p);
10541 if (t == error_mark_node)
10542 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10544 if (scope != ts_current && t && current_class_type
10545 && template_class_depth (current_class_type)
10546 && template_header_p)
10548 /* Since SCOPE is not TS_CURRENT, we are not looking at a
10549 definition of this tag. Since, in addition, we are currently
10550 processing a (member) template declaration of a template
10551 class, we must be very careful; consider:
10558 { template <class V>
10559 friend struct S1; };
10561 Here, the S2::S1 declaration should not be confused with the
10562 outer declaration. In particular, the inner version should
10563 have a template parameter of level 2, not level 1. This
10564 would be particularly important if the member declaration
10567 template <class V = U> friend struct S1;
10569 say, when we should tsubst into `U' when instantiating
10570 S2. On the other hand, when presented with:
10580 we must find the inner binding eventually. We
10581 accomplish this by making sure that the new type we
10582 create to represent this declaration has the right
10584 context = TYPE_CONTEXT (t);
10590 /* If no such tag is yet defined, create a forward-reference node
10591 and record it as the "definition".
10592 When a real declaration of this type is found,
10593 the forward-reference will be altered into a real type. */
10594 if (code == ENUMERAL_TYPE)
10596 error ("use of enum %q#D without previous declaration", name);
10597 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10601 t = make_class_type (code);
10602 TYPE_CONTEXT (t) = context;
10603 t = pushtag (name, t, scope);
10608 if (template_header_p && MAYBE_CLASS_TYPE_P (t))
10610 if (!redeclare_class_template (t, current_template_parms))
10611 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10613 else if (!processing_template_decl
10614 && CLASS_TYPE_P (t)
10615 && CLASSTYPE_IS_TEMPLATE (t))
10617 error ("redeclaration of %qT as a non-template", t);
10618 error ("previous declaration %q+D", t);
10619 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, error_mark_node);
10622 /* Make injected friend class visible. */
10623 if (scope != ts_within_enclosing_non_class
10624 && hidden_name_p (TYPE_NAME (t)))
10626 DECL_ANTICIPATED (TYPE_NAME (t)) = 0;
10627 DECL_FRIEND_P (TYPE_NAME (t)) = 0;
10629 if (TYPE_TEMPLATE_INFO (t))
10631 DECL_ANTICIPATED (TYPE_TI_TEMPLATE (t)) = 0;
10632 DECL_FRIEND_P (TYPE_TI_TEMPLATE (t)) = 0;
10637 POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
10641 xref_tag_from_type (tree old, tree id, tag_scope scope)
10643 enum tag_types tag_kind;
10645 if (TREE_CODE (old) == RECORD_TYPE)
10646 tag_kind = (CLASSTYPE_DECLARED_CLASS (old) ? class_type : record_type);
10648 tag_kind = union_type;
10650 if (id == NULL_TREE)
10651 id = TYPE_IDENTIFIER (old);
10653 return xref_tag (tag_kind, id, scope, false);
10656 /* Create the binfo hierarchy for REF with (possibly NULL) base list
10657 BASE_LIST. For each element on BASE_LIST the TREE_PURPOSE is an
10658 access_* node, and the TREE_VALUE is the type of the base-class.
10659 Non-NULL TREE_TYPE indicates virtual inheritance.
10661 Returns true if the binfo hierarchy was successfully created,
10662 false if an error was detected. */
10665 xref_basetypes (tree ref, tree base_list)
10668 tree binfo, base_binfo;
10669 unsigned max_vbases = 0; /* Maximum direct & indirect virtual bases. */
10670 unsigned max_bases = 0; /* Maximum direct bases. */
10672 tree default_access;
10673 tree igo_prev; /* Track Inheritance Graph Order. */
10675 if (ref == error_mark_node)
10678 /* The base of a derived class is private by default, all others are
10680 default_access = (TREE_CODE (ref) == RECORD_TYPE
10681 && CLASSTYPE_DECLARED_CLASS (ref)
10682 ? access_private_node : access_public_node);
10684 /* First, make sure that any templates in base-classes are
10685 instantiated. This ensures that if we call ourselves recursively
10686 we do not get confused about which classes are marked and which
10688 basep = &base_list;
10691 tree basetype = TREE_VALUE (*basep);
10693 if (!(processing_template_decl && uses_template_parms (basetype))
10694 && !complete_type_or_else (basetype, NULL))
10695 /* An incomplete type. Remove it from the list. */
10696 *basep = TREE_CHAIN (*basep);
10700 if (TREE_TYPE (*basep))
10702 if (CLASS_TYPE_P (basetype))
10703 max_vbases += VEC_length (tree, CLASSTYPE_VBASECLASSES (basetype));
10704 basep = &TREE_CHAIN (*basep);
10708 TYPE_MARKED_P (ref) = 1;
10710 /* The binfo slot should be empty, unless this is an (ill-formed)
10712 gcc_assert (!TYPE_BINFO (ref) || TYPE_SIZE (ref));
10713 gcc_assert (TYPE_MAIN_VARIANT (ref) == ref);
10715 binfo = make_tree_binfo (max_bases);
10717 TYPE_BINFO (ref) = binfo;
10718 BINFO_OFFSET (binfo) = size_zero_node;
10719 BINFO_TYPE (binfo) = ref;
10723 BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, max_bases);
10724 /* An aggregate cannot have baseclasses. */
10725 CLASSTYPE_NON_AGGREGATE (ref) = 1;
10727 if (TREE_CODE (ref) == UNION_TYPE)
10729 error ("derived union %qT invalid", ref);
10736 if (TYPE_FOR_JAVA (ref))
10738 error ("Java class %qT cannot have multiple bases", ref);
10745 CLASSTYPE_VBASECLASSES (ref) = VEC_alloc (tree, gc, max_vbases);
10747 if (TYPE_FOR_JAVA (ref))
10749 error ("Java class %qT cannot have virtual bases", ref);
10754 for (igo_prev = binfo; base_list; base_list = TREE_CHAIN (base_list))
10756 tree access = TREE_PURPOSE (base_list);
10757 int via_virtual = TREE_TYPE (base_list) != NULL_TREE;
10758 tree basetype = TREE_VALUE (base_list);
10760 if (access == access_default_node)
10761 access = default_access;
10763 if (PACK_EXPANSION_P (basetype))
10764 basetype = PACK_EXPANSION_PATTERN (basetype);
10765 if (TREE_CODE (basetype) == TYPE_DECL)
10766 basetype = TREE_TYPE (basetype);
10767 if (!MAYBE_CLASS_TYPE_P (basetype) || TREE_CODE (basetype) == UNION_TYPE)
10769 error ("base type %qT fails to be a struct or class type",
10774 if (TYPE_FOR_JAVA (basetype) && (current_lang_depth () == 0))
10775 TYPE_FOR_JAVA (ref) = 1;
10777 base_binfo = NULL_TREE;
10778 if (CLASS_TYPE_P (basetype) && !dependent_type_p (basetype))
10780 base_binfo = TYPE_BINFO (basetype);
10781 /* The original basetype could have been a typedef'd type. */
10782 basetype = BINFO_TYPE (base_binfo);
10784 /* Inherit flags from the base. */
10785 TYPE_HAS_NEW_OPERATOR (ref)
10786 |= TYPE_HAS_NEW_OPERATOR (basetype);
10787 TYPE_HAS_ARRAY_NEW_OPERATOR (ref)
10788 |= TYPE_HAS_ARRAY_NEW_OPERATOR (basetype);
10789 TYPE_GETS_DELETE (ref) |= TYPE_GETS_DELETE (basetype);
10790 TYPE_HAS_CONVERSION (ref) |= TYPE_HAS_CONVERSION (basetype);
10791 CLASSTYPE_DIAMOND_SHAPED_P (ref)
10792 |= CLASSTYPE_DIAMOND_SHAPED_P (basetype);
10793 CLASSTYPE_REPEATED_BASE_P (ref)
10794 |= CLASSTYPE_REPEATED_BASE_P (basetype);
10797 /* We must do this test after we've seen through a typedef
10799 if (TYPE_MARKED_P (basetype))
10801 if (basetype == ref)
10802 error ("recursive type %qT undefined", basetype);
10804 error ("duplicate base type %qT invalid", basetype);
10808 if (PACK_EXPANSION_P (TREE_VALUE (base_list)))
10809 /* Regenerate the pack expansion for the bases. */
10810 basetype = make_pack_expansion (basetype);
10812 TYPE_MARKED_P (basetype) = 1;
10814 base_binfo = copy_binfo (base_binfo, basetype, ref,
10815 &igo_prev, via_virtual);
10816 if (!BINFO_INHERITANCE_CHAIN (base_binfo))
10817 BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
10819 BINFO_BASE_APPEND (binfo, base_binfo);
10820 BINFO_BASE_ACCESS_APPEND (binfo, access);
10823 if (VEC_space (tree, CLASSTYPE_VBASECLASSES (ref), 1))
10824 /* If we have space in the vbase vector, we must have shared at
10825 least one of them, and are therefore diamond shaped. */
10826 CLASSTYPE_DIAMOND_SHAPED_P (ref) = 1;
10828 /* Unmark all the types. */
10829 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10830 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10831 TYPE_MARKED_P (ref) = 0;
10833 /* Now see if we have a repeated base type. */
10834 if (!CLASSTYPE_REPEATED_BASE_P (ref))
10836 for (base_binfo = binfo; base_binfo;
10837 base_binfo = TREE_CHAIN (base_binfo))
10839 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10841 CLASSTYPE_REPEATED_BASE_P (ref) = 1;
10844 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 1;
10846 for (base_binfo = binfo; base_binfo;
10847 base_binfo = TREE_CHAIN (base_binfo))
10848 if (TYPE_MARKED_P (BINFO_TYPE (base_binfo)))
10849 TYPE_MARKED_P (BINFO_TYPE (base_binfo)) = 0;
10858 /* Begin compiling the definition of an enumeration type.
10861 UNDERLYING_TYPE is the type that will be used as the storage for
10862 the enumeration type. This should be NULL_TREE if no storage type
10865 SCOPED_ENUM_P is true if this is a scoped enumeration type.
10867 Returns the type object, as yet incomplete.
10868 Also records info about it so that build_enumerator
10869 may be used to declare the individual values as they are read. */
10872 start_enum (tree name, tree underlying_type, bool scoped_enum_p)
10876 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
10878 /* If this is the real definition for a previous forward reference,
10879 fill in the contents in the same object that used to be the
10880 forward reference. */
10882 enumtype = lookup_and_check_tag (enum_type, name,
10883 /*tag_scope=*/ts_current,
10884 /*template_header_p=*/false);
10886 if (enumtype != NULL_TREE && TREE_CODE (enumtype) == ENUMERAL_TYPE)
10888 error ("multiple definition of %q#T", enumtype);
10889 error ("%Jprevious definition here", TYPE_MAIN_DECL (enumtype));
10890 /* Clear out TYPE_VALUES, and start again. */
10891 TYPE_VALUES (enumtype) = NULL_TREE;
10895 /* In case of error, make a dummy enum to allow parsing to
10897 if (enumtype == error_mark_node)
10898 name = make_anon_name ();
10900 enumtype = make_node (ENUMERAL_TYPE);
10901 enumtype = pushtag (name, enumtype, /*tag_scope=*/ts_current);
10904 if (enumtype == error_mark_node)
10909 SET_SCOPED_ENUM_P (enumtype, 1);
10910 begin_scope (sk_scoped_enum, enumtype);
10912 /* [C++0x dcl.enum]p5:
10914 If not explicitly specified, the underlying type of a scoped
10915 enumeration type is int. */
10916 if (!underlying_type)
10917 underlying_type = integer_type_node;
10920 if (underlying_type)
10922 if (CP_INTEGRAL_TYPE_P (underlying_type))
10924 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (underlying_type);
10925 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (underlying_type);
10926 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
10927 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
10928 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
10929 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
10930 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
10931 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
10932 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
10933 ENUM_UNDERLYING_TYPE (enumtype) = underlying_type;
10936 error ("underlying type %<%T%> of %<%T%> must be an integral type",
10937 underlying_type, enumtype);
10943 /* After processing and defining all the values of an enumeration type,
10944 install their decls in the enumeration type and finish it off.
10945 ENUMTYPE is the type object and VALUES a list of name-value pairs. */
10948 finish_enum (tree enumtype)
10957 bool use_short_enum;
10961 integer_type_kind itk;
10962 tree underlying_type = NULL_TREE;
10963 bool fixed_underlying_type_p
10964 = ENUM_UNDERLYING_TYPE (enumtype) != NULL_TREE;
10966 /* We built up the VALUES in reverse order. */
10967 TYPE_VALUES (enumtype) = nreverse (TYPE_VALUES (enumtype));
10969 /* For an enum defined in a template, just set the type of the values;
10970 all further processing is postponed until the template is
10971 instantiated. We need to set the type so that tsubst of a CONST_DECL
10973 if (processing_template_decl)
10975 for (values = TYPE_VALUES (enumtype);
10977 values = TREE_CHAIN (values))
10978 TREE_TYPE (TREE_VALUE (values)) = enumtype;
10979 if (at_function_scope_p ())
10980 add_stmt (build_min (TAG_DEFN, enumtype));
10984 /* Determine the minimum and maximum values of the enumerators. */
10985 if (TYPE_VALUES (enumtype))
10987 minnode = maxnode = NULL_TREE;
10989 for (values = TYPE_VALUES (enumtype);
10991 values = TREE_CHAIN (values))
10993 decl = TREE_VALUE (values);
10995 /* [dcl.enum]: Following the closing brace of an enum-specifier,
10996 each enumerator has the type of its enumeration. Prior to the
10997 closing brace, the type of each enumerator is the type of its
10998 initializing value. */
10999 TREE_TYPE (decl) = enumtype;
11001 /* Update the minimum and maximum values, if appropriate. */
11002 value = DECL_INITIAL (decl);
11003 if (value == error_mark_node)
11004 value = integer_zero_node;
11005 /* Figure out what the minimum and maximum values of the
11006 enumerators are. */
11008 minnode = maxnode = value;
11009 else if (tree_int_cst_lt (maxnode, value))
11011 else if (tree_int_cst_lt (value, minnode))
11018 If the enumerator-list is empty, the underlying type is as if
11019 the enumeration had a single enumerator with value 0. */
11020 minnode = maxnode = integer_zero_node;
11022 /* Compute the number of bits require to represent all values of the
11023 enumeration. We must do this before the type of MINNODE and
11024 MAXNODE are transformed, since tree_int_cst_min_precision relies
11025 on the TREE_TYPE of the value it is passed. */
11026 unsignedp = tree_int_cst_sgn (minnode) >= 0;
11027 lowprec = tree_int_cst_min_precision (minnode, unsignedp);
11028 highprec = tree_int_cst_min_precision (maxnode, unsignedp);
11029 precision = MAX (lowprec, highprec);
11031 if (!fixed_underlying_type_p)
11033 /* Determine the underlying type of the enumeration.
11037 The underlying type of an enumeration is an integral type that
11038 can represent all the enumerator values defined in the
11039 enumeration. It is implementation-defined which integral type is
11040 used as the underlying type for an enumeration except that the
11041 underlying type shall not be larger than int unless the value of
11042 an enumerator cannot fit in an int or unsigned int.
11044 We use "int" or an "unsigned int" as the underlying type, even if
11045 a smaller integral type would work, unless the user has
11046 explicitly requested that we use the smallest possible type. The
11047 user can request that for all enumerations with a command line
11048 flag, or for just one enumeration with an attribute. */
11050 use_short_enum = flag_short_enums
11051 || lookup_attribute ("packed", TYPE_ATTRIBUTES (enumtype));
11053 for (itk = (use_short_enum ? itk_char : itk_int);
11057 underlying_type = integer_types[itk];
11058 if (TYPE_PRECISION (underlying_type) >= precision
11059 && TYPE_UNSIGNED (underlying_type) == unsignedp)
11062 if (itk == itk_none)
11066 IF no integral type can represent all the enumerator values, the
11067 enumeration is ill-formed. */
11068 error ("no integral type can represent all of the enumerator values "
11069 "for %qT", enumtype);
11070 precision = TYPE_PRECISION (long_long_integer_type_node);
11071 underlying_type = integer_types[itk_unsigned_long_long];
11076 The value of sizeof() applied to an enumeration type, an object
11077 of an enumeration type, or an enumerator, is the value of sizeof()
11078 applied to the underlying type. */
11079 TYPE_SIZE (enumtype) = TYPE_SIZE (underlying_type);
11080 TYPE_SIZE_UNIT (enumtype) = TYPE_SIZE_UNIT (underlying_type);
11081 SET_TYPE_MODE (enumtype, TYPE_MODE (underlying_type));
11082 TYPE_ALIGN (enumtype) = TYPE_ALIGN (underlying_type);
11083 TYPE_USER_ALIGN (enumtype) = TYPE_USER_ALIGN (underlying_type);
11084 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (underlying_type);
11086 /* Set the underlying type of the enumeration type to the
11087 computed enumeration type, restricted to the enumerator
11089 ENUM_UNDERLYING_TYPE (enumtype) = copy_node (underlying_type);
11090 set_min_and_max_values_for_integral_type
11091 (ENUM_UNDERLYING_TYPE (enumtype), precision, unsignedp);
11094 underlying_type = ENUM_UNDERLYING_TYPE (enumtype);
11096 /* Compute the minimum and maximum values for the type.
11100 For an enumeration where emin is the smallest enumerator and emax
11101 is the largest, the values of the enumeration are the values of the
11102 underlying type in the range bmin to bmax, where bmin and bmax are,
11103 respectively, the smallest and largest values of the smallest bit-
11104 field that can store emin and emax. */
11106 /* The middle-end currently assumes that types with TYPE_PRECISION
11107 narrower than their underlying type are suitably zero or sign
11108 extended to fill their mode. g++ doesn't make these guarantees.
11109 Until the middle-end can represent such paradoxical types, we
11110 set the TYPE_PRECISION to the width of the underlying type. */
11111 TYPE_PRECISION (enumtype) = TYPE_PRECISION (underlying_type);
11113 set_min_and_max_values_for_integral_type (enumtype, precision, unsignedp);
11115 /* Convert each of the enumerators to the type of the underlying
11116 type of the enumeration. */
11117 for (values = TYPE_VALUES (enumtype); values; values = TREE_CHAIN (values))
11119 location_t saved_location;
11121 decl = TREE_VALUE (values);
11122 saved_location = input_location;
11123 input_location = DECL_SOURCE_LOCATION (decl);
11124 if (fixed_underlying_type_p)
11125 /* If the enumeration type has a fixed underlying type, we
11126 already checked all of the enumerator values. */
11127 value = DECL_INITIAL (decl);
11129 value = perform_implicit_conversion (underlying_type,
11130 DECL_INITIAL (decl),
11131 tf_warning_or_error);
11132 input_location = saved_location;
11134 /* Do not clobber shared ints. */
11135 value = copy_node (value);
11137 TREE_TYPE (value) = enumtype;
11138 DECL_INITIAL (decl) = value;
11141 /* Fix up all variant types of this enum type. */
11142 for (t = TYPE_MAIN_VARIANT (enumtype); t; t = TYPE_NEXT_VARIANT (t))
11144 TYPE_VALUES (t) = TYPE_VALUES (enumtype);
11145 TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (enumtype);
11146 TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (enumtype);
11147 TYPE_SIZE (t) = TYPE_SIZE (enumtype);
11148 TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (enumtype);
11149 SET_TYPE_MODE (t, TYPE_MODE (enumtype));
11150 TYPE_PRECISION (t) = TYPE_PRECISION (enumtype);
11151 TYPE_ALIGN (t) = TYPE_ALIGN (enumtype);
11152 TYPE_USER_ALIGN (t) = TYPE_USER_ALIGN (enumtype);
11153 TYPE_UNSIGNED (t) = TYPE_UNSIGNED (enumtype);
11154 ENUM_UNDERLYING_TYPE (t) = ENUM_UNDERLYING_TYPE (enumtype);
11157 /* Finish up the scope of a scoped enumeration. */
11158 if (SCOPED_ENUM_P (enumtype))
11161 /* Finish debugging output for this type. */
11162 rest_of_type_compilation (enumtype, namespace_bindings_p ());
11165 /* Build and install a CONST_DECL for an enumeration constant of the
11166 enumeration type ENUMTYPE whose NAME and VALUE (if any) are provided.
11167 Assignment of sequential values by default is handled here. */
11170 build_enumerator (tree name, tree value, tree enumtype)
11176 /* If the VALUE was erroneous, pretend it wasn't there; that will
11177 result in the enum being assigned the next value in sequence. */
11178 if (value == error_mark_node)
11181 /* Remove no-op casts from the value. */
11183 STRIP_TYPE_NOPS (value);
11185 if (! processing_template_decl)
11187 /* Validate and default VALUE. */
11188 if (value != NULL_TREE)
11190 value = integral_constant_value (value);
11192 if (TREE_CODE (value) == INTEGER_CST)
11194 value = perform_integral_promotions (value);
11195 constant_expression_warning (value);
11199 error ("enumerator value for %qD is not an integer constant", name);
11204 /* Default based on previous value. */
11205 if (value == NULL_TREE)
11207 if (TYPE_VALUES (enumtype))
11210 unsigned HOST_WIDE_INT lo;
11214 /* The next value is the previous value plus one.
11215 add_double doesn't know the type of the target expression,
11216 so we must check with int_fits_type_p as well. */
11217 prev_value = DECL_INITIAL (TREE_VALUE (TYPE_VALUES (enumtype)));
11218 if (error_operand_p (prev_value))
11219 value = error_mark_node;
11222 overflowed = add_double (TREE_INT_CST_LOW (prev_value),
11223 TREE_INT_CST_HIGH (prev_value),
11225 value = build_int_cst_wide (TREE_TYPE (prev_value), lo, hi);
11227 |= !int_fits_type_p (value, TREE_TYPE (prev_value));
11231 error ("overflow in enumeration values at %qD", name);
11232 value = error_mark_node;
11237 value = integer_zero_node;
11240 /* Remove no-op casts from the value. */
11241 STRIP_TYPE_NOPS (value);
11243 /* If the underlying type of the enum is fixed, check whether
11244 the enumerator values fits in the underlying type. If it
11245 does not fit, the program is ill-formed [C++0x dcl.enum]. */
11246 if (ENUM_UNDERLYING_TYPE (enumtype)
11248 && TREE_CODE (value) == INTEGER_CST
11249 && !int_fits_type_p (value, ENUM_UNDERLYING_TYPE (enumtype)))
11251 error ("enumerator value %E is too large for underlying type %<%T%>",
11252 value, ENUM_UNDERLYING_TYPE (enumtype));
11254 /* Silently convert the value so that we can continue. */
11255 value = perform_implicit_conversion (ENUM_UNDERLYING_TYPE (enumtype),
11260 /* C++ associates enums with global, function, or class declarations. */
11261 context = current_scope ();
11263 /* Build the actual enumeration constant. Note that the enumeration
11264 constants have the underlying type of the enum (if it is fixed)
11265 or the type of their initializer (if the underlying type of the
11266 enum is not fixed):
11270 If the underlying type is fixed, the type of each enumerator
11271 prior to the closing brace is the underlying type; if the
11272 initializing value of an enumerator cannot be represented by
11273 the underlying type, the program is ill-formed. If the
11274 underlying type is not fixed, the type of each enumerator is
11275 the type of its initializing value.
11277 If the underlying type is not fixed, it will be computed by
11278 finish_enum and we will reset the type of this enumerator. Of
11279 course, if we're processing a template, there may be no value. */
11280 type = value ? TREE_TYPE (value) : NULL_TREE;
11282 if (context && context == current_class_type)
11283 /* This enum declaration is local to the class. We need the full
11284 lang_decl so that we can record DECL_CLASS_CONTEXT, for example. */
11285 decl = build_lang_decl (CONST_DECL, name, type);
11287 /* It's a global enum, or it's local to a function. (Note local to
11288 a function could mean local to a class method. */
11289 decl = build_decl (CONST_DECL, name, type);
11291 DECL_CONTEXT (decl) = FROB_CONTEXT (context);
11292 TREE_CONSTANT (decl) = 1;
11293 TREE_READONLY (decl) = 1;
11294 DECL_INITIAL (decl) = value;
11296 if (context && context == current_class_type)
11297 /* In something like `struct S { enum E { i = 7 }; };' we put `i'
11298 on the TYPE_FIELDS list for `S'. (That's so that you can say
11299 things like `S::i' later.) */
11300 finish_member_declaration (decl);
11304 /* Add this enumeration constant to the list for this type. */
11305 TYPE_VALUES (enumtype) = tree_cons (name, decl, TYPE_VALUES (enumtype));
11308 /* Look for an enumerator with the given NAME within the enumeration
11309 type ENUMTYPE. This routine is used primarily for qualified name
11310 lookup into an enumerator in C++0x, e.g.,
11312 enum class Color { Red, Green, Blue };
11314 Color color = Color::Red;
11316 Returns the value corresponding to the enumerator, or
11317 NULL_TREE if no such enumerator was found. */
11319 lookup_enumerator (tree enumtype, tree name)
11322 gcc_assert (enumtype && TREE_CODE (enumtype) == ENUMERAL_TYPE);
11324 e = purpose_member (name, TYPE_VALUES (enumtype));
11325 return e? TREE_VALUE (e) : NULL_TREE;
11329 /* We're defining DECL. Make sure that it's type is OK. */
11332 check_function_type (tree decl, tree current_function_parms)
11334 tree fntype = TREE_TYPE (decl);
11335 tree return_type = complete_type (TREE_TYPE (fntype));
11337 /* In a function definition, arg types must be complete. */
11338 require_complete_types_for_parms (current_function_parms);
11340 if (dependent_type_p (return_type))
11342 if (!COMPLETE_OR_VOID_TYPE_P (return_type)
11343 || (TYPE_FOR_JAVA (return_type) && MAYBE_CLASS_TYPE_P (return_type)))
11345 tree args = TYPE_ARG_TYPES (fntype);
11347 if (!COMPLETE_OR_VOID_TYPE_P (return_type))
11348 error ("return type %q#T is incomplete", return_type);
11350 error ("return type has Java class type %q#T", return_type);
11352 /* Make it return void instead. */
11353 if (TREE_CODE (fntype) == METHOD_TYPE)
11354 fntype = build_method_type_directly (TREE_TYPE (TREE_VALUE (args)),
11356 TREE_CHAIN (args));
11358 fntype = build_function_type (void_type_node, args);
11360 = build_exception_variant (fntype,
11361 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)));
11364 abstract_virtuals_error (decl, TREE_TYPE (fntype));
11367 /* Create the FUNCTION_DECL for a function definition.
11368 DECLSPECS and DECLARATOR are the parts of the declaration;
11369 they describe the function's name and the type it returns,
11370 but twisted together in a fashion that parallels the syntax of C.
11372 FLAGS is a bitwise or of SF_PRE_PARSED (indicating that the
11373 DECLARATOR is really the DECL for the function we are about to
11374 process and that DECLSPECS should be ignored), SF_INCLASS_INLINE
11375 indicating that the function is an inline defined in-class.
11377 This function creates a binding context for the function body
11378 as well as setting up the FUNCTION_DECL in current_function_decl.
11380 For C++, we must first check whether that datum makes any sense.
11381 For example, "class A local_a(1,2);" means that variable local_a
11382 is an aggregate of type A, which should have a constructor
11383 applied to it with the argument list [1, 2].
11385 On entry, DECL_INITIAL (decl1) should be NULL_TREE or error_mark_node,
11386 or may be a BLOCK if the function has been defined previously
11387 in this translation unit. On exit, DECL_INITIAL (decl1) will be
11388 error_mark_node if the function has never been defined, or
11389 a BLOCK if the function has been defined somewhere. */
11392 start_preparsed_function (tree decl1, tree attrs, int flags)
11394 tree ctype = NULL_TREE;
11397 int doing_friend = 0;
11398 struct cp_binding_level *bl;
11399 tree current_function_parms;
11400 struct c_fileinfo *finfo
11401 = get_fileinfo (LOCATION_FILE (DECL_SOURCE_LOCATION (decl1)));
11402 bool honor_interface;
11404 /* Sanity check. */
11405 gcc_assert (TREE_CODE (TREE_VALUE (void_list_node)) == VOID_TYPE);
11406 gcc_assert (TREE_CHAIN (void_list_node) == NULL_TREE);
11408 fntype = TREE_TYPE (decl1);
11409 if (TREE_CODE (fntype) == METHOD_TYPE)
11410 ctype = TYPE_METHOD_BASETYPE (fntype);
11412 /* ISO C++ 11.4/5. A friend function defined in a class is in
11413 the (lexical) scope of the class in which it is defined. */
11414 if (!ctype && DECL_FRIEND_P (decl1))
11416 ctype = DECL_FRIEND_CONTEXT (decl1);
11418 /* CTYPE could be null here if we're dealing with a template;
11419 for example, `inline friend float foo()' inside a template
11420 will have no CTYPE set. */
11421 if (ctype && TREE_CODE (ctype) != RECORD_TYPE)
11427 if (DECL_DECLARED_INLINE_P (decl1)
11428 && lookup_attribute ("noinline", attrs))
11429 warning (0, "inline function %q+D given attribute noinline", decl1);
11431 /* Handle gnu_inline attribute. */
11432 if (GNU_INLINE_P (decl1))
11434 DECL_EXTERNAL (decl1) = 1;
11435 DECL_NOT_REALLY_EXTERN (decl1) = 0;
11436 DECL_INTERFACE_KNOWN (decl1) = 1;
11437 DECL_DISREGARD_INLINE_LIMITS (decl1) = 1;
11440 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl1))
11441 /* This is a constructor, we must ensure that any default args
11442 introduced by this definition are propagated to the clones
11443 now. The clones are used directly in overload resolution. */
11444 adjust_clone_args (decl1);
11446 /* Sometimes we don't notice that a function is a static member, and
11447 build a METHOD_TYPE for it. Fix that up now. */
11448 if (ctype != NULL_TREE && DECL_STATIC_FUNCTION_P (decl1)
11449 && TREE_CODE (TREE_TYPE (decl1)) == METHOD_TYPE)
11451 revert_static_member_fn (decl1);
11455 /* Set up current_class_type, and enter the scope of the class, if
11458 push_nested_class (ctype);
11459 else if (DECL_STATIC_FUNCTION_P (decl1))
11460 push_nested_class (DECL_CONTEXT (decl1));
11462 /* Now that we have entered the scope of the class, we must restore
11463 the bindings for any template parameters surrounding DECL1, if it
11464 is an inline member template. (Order is important; consider the
11465 case where a template parameter has the same name as a field of
11466 the class.) It is not until after this point that
11467 PROCESSING_TEMPLATE_DECL is guaranteed to be set up correctly. */
11468 if (flags & SF_INCLASS_INLINE)
11469 maybe_begin_member_template_processing (decl1);
11471 /* Effective C++ rule 15. */
11473 && DECL_OVERLOADED_OPERATOR_P (decl1) == NOP_EXPR
11474 && TREE_CODE (TREE_TYPE (fntype)) == VOID_TYPE)
11475 warning (OPT_Weffc__, "%<operator=%> should return a reference to %<*this%>");
11477 /* Make the init_value nonzero so pushdecl knows this is not tentative.
11478 error_mark_node is replaced below (in poplevel) with the BLOCK. */
11479 if (!DECL_INITIAL (decl1))
11480 DECL_INITIAL (decl1) = error_mark_node;
11482 /* This function exists in static storage.
11483 (This does not mean `static' in the C sense!) */
11484 TREE_STATIC (decl1) = 1;
11486 /* We must call push_template_decl after current_class_type is set
11487 up. (If we are processing inline definitions after exiting a
11488 class scope, current_class_type will be NULL_TREE until set above
11489 by push_nested_class.) */
11490 if (processing_template_decl)
11492 /* FIXME: Handle error_mark_node more gracefully. */
11493 tree newdecl1 = push_template_decl (decl1);
11494 if (newdecl1 != error_mark_node)
11498 /* We are now in the scope of the function being defined. */
11499 current_function_decl = decl1;
11501 /* Save the parm names or decls from this function's declarator
11502 where store_parm_decls will find them. */
11503 current_function_parms = DECL_ARGUMENTS (decl1);
11505 /* Make sure the parameter and return types are reasonable. When
11506 you declare a function, these types can be incomplete, but they
11507 must be complete when you define the function. */
11508 check_function_type (decl1, current_function_parms);
11510 /* Build the return declaration for the function. */
11511 restype = TREE_TYPE (fntype);
11512 if (DECL_RESULT (decl1) == NULL_TREE)
11516 resdecl = build_decl (RESULT_DECL, 0, restype);
11517 DECL_ARTIFICIAL (resdecl) = 1;
11518 DECL_IGNORED_P (resdecl) = 1;
11519 DECL_RESULT (decl1) = resdecl;
11521 cp_apply_type_quals_to_decl (cp_type_quals (restype), resdecl);
11524 /* Let the user know we're compiling this function. */
11525 announce_function (decl1);
11527 /* Record the decl so that the function name is defined.
11528 If we already have a decl for this name, and it is a FUNCTION_DECL,
11529 use the old decl. */
11530 if (!processing_template_decl && !(flags & SF_PRE_PARSED))
11532 /* A specialization is not used to guide overload resolution. */
11533 if (!DECL_FUNCTION_MEMBER_P (decl1)
11534 && !(DECL_USE_TEMPLATE (decl1) &&
11535 PRIMARY_TEMPLATE_P (DECL_TI_TEMPLATE (decl1))))
11537 tree olddecl = pushdecl (decl1);
11539 if (olddecl == error_mark_node)
11540 /* If something went wrong when registering the declaration,
11541 use DECL1; we have to have a FUNCTION_DECL to use when
11542 parsing the body of the function. */
11546 /* Otherwise, OLDDECL is either a previous declaration
11547 of the same function or DECL1 itself. */
11549 if (warn_missing_declarations
11550 && olddecl == decl1
11551 && !DECL_MAIN_P (decl1)
11552 && TREE_PUBLIC (decl1)
11553 && !DECL_DECLARED_INLINE_P (decl1))
11557 /* Check whether DECL1 is in an anonymous
11559 for (context = DECL_CONTEXT (decl1);
11561 context = DECL_CONTEXT (context))
11563 if (TREE_CODE (context) == NAMESPACE_DECL
11564 && DECL_NAME (context) == NULL_TREE)
11568 if (context == NULL)
11569 warning (OPT_Wmissing_declarations,
11570 "no previous declaration for %q+D", decl1);
11578 /* We need to set the DECL_CONTEXT. */
11579 if (!DECL_CONTEXT (decl1) && DECL_TEMPLATE_INFO (decl1))
11580 DECL_CONTEXT (decl1) = DECL_CONTEXT (DECL_TI_TEMPLATE (decl1));
11582 fntype = TREE_TYPE (decl1);
11584 /* If #pragma weak applies, mark the decl appropriately now.
11585 The pragma only applies to global functions. Because
11586 determining whether or not the #pragma applies involves
11587 computing the mangled name for the declaration, we cannot
11588 apply the pragma until after we have merged this declaration
11589 with any previous declarations; if the original declaration
11590 has a linkage specification, that specification applies to
11591 the definition as well, and may affect the mangled name. */
11592 if (!DECL_CONTEXT (decl1))
11593 maybe_apply_pragma_weak (decl1);
11596 /* Reset this in case the call to pushdecl changed it. */
11597 current_function_decl = decl1;
11599 gcc_assert (DECL_INITIAL (decl1));
11601 /* This function may already have been parsed, in which case just
11602 return; our caller will skip over the body without parsing. */
11603 if (DECL_INITIAL (decl1) != error_mark_node)
11606 /* Initialize RTL machinery. We cannot do this until
11607 CURRENT_FUNCTION_DECL and DECL_RESULT are set up. We do this
11608 even when processing a template; this is how we get
11609 CFUN set up, and our per-function variables initialized.
11610 FIXME factor out the non-RTL stuff. */
11611 bl = current_binding_level;
11612 allocate_struct_function (decl1, processing_template_decl);
11614 /* Initialize the language data structures. Whenever we start
11615 a new function, we destroy temporaries in the usual way. */
11616 cfun->language = GGC_CNEW (struct language_function);
11617 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
11618 current_binding_level = bl;
11620 /* Even though we're inside a function body, we still don't want to
11621 call expand_expr to calculate the size of a variable-sized array.
11622 We haven't necessarily assigned RTL to all variables yet, so it's
11623 not safe to try to expand expressions involving them. */
11624 cfun->dont_save_pending_sizes_p = 1;
11626 /* Start the statement-tree, start the tree now. */
11627 DECL_SAVED_TREE (decl1) = push_stmt_list ();
11629 /* If we are (erroneously) defining a function that we have already
11630 defined before, wipe out what we knew before. */
11631 if (!DECL_PENDING_INLINE_P (decl1))
11632 DECL_SAVED_FUNCTION_DATA (decl1) = NULL;
11634 if (ctype && !doing_friend && !DECL_STATIC_FUNCTION_P (decl1))
11636 /* We know that this was set up by `grokclassfn'. We do not
11637 wait until `store_parm_decls', since evil parse errors may
11638 never get us to that point. Here we keep the consistency
11639 between `current_class_type' and `current_class_ptr'. */
11640 tree t = DECL_ARGUMENTS (decl1);
11642 gcc_assert (t != NULL_TREE && TREE_CODE (t) == PARM_DECL);
11643 gcc_assert (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE);
11645 cp_function_chain->x_current_class_ref
11646 = cp_build_indirect_ref (t, NULL, tf_warning_or_error);
11647 cp_function_chain->x_current_class_ptr = t;
11649 /* Constructors and destructors need to know whether they're "in
11650 charge" of initializing virtual base classes. */
11651 t = TREE_CHAIN (t);
11652 if (DECL_HAS_IN_CHARGE_PARM_P (decl1))
11654 current_in_charge_parm = t;
11655 t = TREE_CHAIN (t);
11657 if (DECL_HAS_VTT_PARM_P (decl1))
11659 gcc_assert (DECL_NAME (t) == vtt_parm_identifier);
11660 current_vtt_parm = t;
11664 honor_interface = (!DECL_TEMPLATE_INSTANTIATION (decl1)
11665 /* Implicitly-defined methods (like the
11666 destructor for a class in which no destructor
11667 is explicitly declared) must not be defined
11668 until their definition is needed. So, we
11669 ignore interface specifications for
11670 compiler-generated functions. */
11671 && !DECL_ARTIFICIAL (decl1));
11673 if (DECL_INTERFACE_KNOWN (decl1))
11675 tree ctx = decl_function_context (decl1);
11677 if (DECL_NOT_REALLY_EXTERN (decl1))
11678 DECL_EXTERNAL (decl1) = 0;
11680 if (ctx != NULL_TREE && DECL_DECLARED_INLINE_P (ctx)
11681 && TREE_PUBLIC (ctx))
11682 /* This is a function in a local class in an extern inline
11684 comdat_linkage (decl1);
11686 /* If this function belongs to an interface, it is public.
11687 If it belongs to someone else's interface, it is also external.
11688 This only affects inlines and template instantiations. */
11689 else if (!finfo->interface_unknown && honor_interface)
11691 if (DECL_DECLARED_INLINE_P (decl1)
11692 || DECL_TEMPLATE_INSTANTIATION (decl1)
11693 || processing_template_decl)
11695 DECL_EXTERNAL (decl1)
11696 = (finfo->interface_only
11697 || (DECL_DECLARED_INLINE_P (decl1)
11698 && ! flag_implement_inlines
11699 && !DECL_VINDEX (decl1)));
11701 /* For WIN32 we also want to put these in linkonce sections. */
11702 maybe_make_one_only (decl1);
11705 DECL_EXTERNAL (decl1) = 0;
11706 DECL_INTERFACE_KNOWN (decl1) = 1;
11707 /* If this function is in an interface implemented in this file,
11708 make sure that the back end knows to emit this function
11710 if (!DECL_EXTERNAL (decl1))
11711 mark_needed (decl1);
11713 else if (finfo->interface_unknown && finfo->interface_only
11714 && honor_interface)
11716 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma
11717 interface, we will have both finfo->interface_unknown and
11718 finfo->interface_only set. In that case, we don't want to
11719 use the normal heuristics because someone will supply a
11720 #pragma implementation elsewhere, and deducing it here would
11721 produce a conflict. */
11722 comdat_linkage (decl1);
11723 DECL_EXTERNAL (decl1) = 0;
11724 DECL_INTERFACE_KNOWN (decl1) = 1;
11725 DECL_DEFER_OUTPUT (decl1) = 1;
11729 /* This is a definition, not a reference.
11730 So clear DECL_EXTERNAL, unless this is a GNU extern inline. */
11731 if (!GNU_INLINE_P (decl1))
11732 DECL_EXTERNAL (decl1) = 0;
11734 if ((DECL_DECLARED_INLINE_P (decl1)
11735 || DECL_TEMPLATE_INSTANTIATION (decl1))
11736 && ! DECL_INTERFACE_KNOWN (decl1)
11737 /* Don't try to defer nested functions for now. */
11738 && ! decl_function_context (decl1))
11739 DECL_DEFER_OUTPUT (decl1) = 1;
11741 DECL_INTERFACE_KNOWN (decl1) = 1;
11744 /* Determine the ELF visibility attribute for the function. We must not
11745 do this before calling "pushdecl", as we must allow "duplicate_decls"
11746 to merge any attributes appropriately. We also need to wait until
11748 if (!DECL_CLONED_FUNCTION_P (decl1))
11749 determine_visibility (decl1);
11751 begin_scope (sk_function_parms, decl1);
11755 if (DECL_DESTRUCTOR_P (decl1)
11756 || (DECL_CONSTRUCTOR_P (decl1)
11757 && targetm.cxx.cdtor_returns_this ()))
11759 cdtor_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
11760 DECL_CONTEXT (cdtor_label) = current_function_decl;
11763 start_fname_decls ();
11765 store_parm_decls (current_function_parms);
11769 /* Like start_preparsed_function, except that instead of a
11770 FUNCTION_DECL, this function takes DECLSPECS and DECLARATOR.
11772 Returns 1 on success. If the DECLARATOR is not suitable for a function
11773 (it defines a datum instead), we return 0, which tells
11774 yyparse to report a parse error. */
11777 start_function (cp_decl_specifier_seq *declspecs,
11778 const cp_declarator *declarator,
11783 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, &attrs);
11784 if (decl1 == error_mark_node)
11786 /* If the declarator is not suitable for a function definition,
11787 cause a syntax error. */
11788 if (decl1 == NULL_TREE || TREE_CODE (decl1) != FUNCTION_DECL)
11790 error ("invalid function declaration");
11794 if (DECL_MAIN_P (decl1))
11795 /* main must return int. grokfndecl should have corrected it
11796 (and issued a diagnostic) if the user got it wrong. */
11797 gcc_assert (same_type_p (TREE_TYPE (TREE_TYPE (decl1)),
11798 integer_type_node));
11800 start_preparsed_function (decl1, attrs, /*flags=*/SF_DEFAULT);
11805 /* Returns true iff an EH_SPEC_BLOCK should be created in the body of
11809 use_eh_spec_block (tree fn)
11811 return (flag_exceptions && flag_enforce_eh_specs
11812 && !processing_template_decl
11813 && TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))
11814 /* We insert the EH_SPEC_BLOCK only in the original
11815 function; then, it is copied automatically to the
11817 && !DECL_CLONED_FUNCTION_P (fn)
11818 /* Implicitly-generated constructors and destructors have
11819 exception specifications. However, those specifications
11820 are the union of the possible exceptions specified by the
11821 constructors/destructors for bases and members, so no
11822 unallowed exception will ever reach this function. By
11823 not creating the EH_SPEC_BLOCK we save a little memory,
11824 and we avoid spurious warnings about unreachable
11826 && !DECL_ARTIFICIAL (fn));
11829 /* Store the parameter declarations into the current function declaration.
11830 This is called after parsing the parameter declarations, before
11831 digesting the body of the function.
11833 Also install to binding contour return value identifier, if any. */
11836 store_parm_decls (tree current_function_parms)
11838 tree fndecl = current_function_decl;
11841 /* This is a chain of any other decls that came in among the parm
11842 declarations. If a parm is declared with enum {foo, bar} x;
11843 then CONST_DECLs for foo and bar are put here. */
11844 tree nonparms = NULL_TREE;
11846 if (current_function_parms)
11848 /* This case is when the function was defined with an ANSI prototype.
11849 The parms already have decls, so we need not do anything here
11850 except record them as in effect
11851 and complain if any redundant old-style parm decls were written. */
11853 tree specparms = current_function_parms;
11856 /* Must clear this because it might contain TYPE_DECLs declared
11858 current_binding_level->names = NULL;
11860 /* If we're doing semantic analysis, then we'll call pushdecl
11861 for each of these. We must do them in reverse order so that
11862 they end in the correct forward order. */
11863 specparms = nreverse (specparms);
11865 for (parm = specparms; parm; parm = next)
11867 next = TREE_CHAIN (parm);
11868 if (TREE_CODE (parm) == PARM_DECL)
11870 if (DECL_NAME (parm) == NULL_TREE
11871 || TREE_CODE (parm) != VOID_TYPE)
11874 error ("parameter %qD declared void", parm);
11878 /* If we find an enum constant or a type tag,
11879 put it aside for the moment. */
11880 TREE_CHAIN (parm) = NULL_TREE;
11881 nonparms = chainon (nonparms, parm);
11885 /* Get the decls in their original chain order and record in the
11886 function. This is all and only the PARM_DECLs that were
11887 pushed into scope by the loop above. */
11888 DECL_ARGUMENTS (fndecl) = getdecls ();
11891 DECL_ARGUMENTS (fndecl) = NULL_TREE;
11893 /* Now store the final chain of decls for the arguments
11894 as the decl-chain of the current lexical scope.
11895 Put the enumerators in as well, at the front so that
11896 DECL_ARGUMENTS is not modified. */
11897 current_binding_level->names = chainon (nonparms, DECL_ARGUMENTS (fndecl));
11899 if (use_eh_spec_block (current_function_decl))
11900 current_eh_spec_block = begin_eh_spec_block ();
11904 /* We have finished doing semantic analysis on DECL, but have not yet
11905 generated RTL for its body. Save away our current state, so that
11906 when we want to generate RTL later we know what to do. */
11909 save_function_data (tree decl)
11911 struct language_function *f;
11913 /* Save the language-specific per-function data so that we can
11914 get it back when we really expand this function. */
11915 gcc_assert (!DECL_PENDING_INLINE_P (decl));
11918 f = GGC_NEW (struct language_function);
11919 memcpy (f, cp_function_chain, sizeof (struct language_function));
11920 DECL_SAVED_FUNCTION_DATA (decl) = f;
11922 /* Clear out the bits we don't need. */
11923 f->base.x_stmt_tree.x_cur_stmt_list = NULL_TREE;
11924 f->bindings = NULL;
11925 f->x_local_names = NULL;
11929 /* Set the return value of the constructor (if present). */
11932 finish_constructor_body (void)
11937 if (targetm.cxx.cdtor_returns_this ()
11938 && (! TYPE_FOR_JAVA (current_class_type)))
11940 /* Any return from a constructor will end up here. */
11941 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11943 val = DECL_ARGUMENTS (current_function_decl);
11944 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
11945 DECL_RESULT (current_function_decl), val);
11946 /* Return the address of the object. */
11947 exprstmt = build_stmt (RETURN_EXPR, val);
11948 add_stmt (exprstmt);
11952 /* Do all the processing for the beginning of a destructor; set up the
11953 vtable pointers and cleanups for bases and members. */
11956 begin_destructor_body (void)
11958 tree compound_stmt;
11960 /* If the CURRENT_CLASS_TYPE is incomplete, we will have already
11961 issued an error message. We still want to try to process the
11962 body of the function, but initialize_vtbl_ptrs will crash if
11963 TYPE_BINFO is NULL. */
11964 if (COMPLETE_TYPE_P (current_class_type))
11966 compound_stmt = begin_compound_stmt (0);
11967 /* Make all virtual function table pointers in non-virtual base
11968 classes point to CURRENT_CLASS_TYPE's virtual function
11970 initialize_vtbl_ptrs (current_class_ptr);
11971 finish_compound_stmt (compound_stmt);
11973 /* And insert cleanups for our bases and members so that they
11974 will be properly destroyed if we throw. */
11975 push_base_cleanups ();
11979 /* At the end of every destructor we generate code to delete the object if
11980 necessary. Do that now. */
11983 finish_destructor_body (void)
11987 /* Any return from a destructor will end up here; that way all base
11988 and member cleanups will be run when the function returns. */
11989 add_stmt (build_stmt (LABEL_EXPR, cdtor_label));
11991 /* In a virtual destructor, we must call delete. */
11992 if (DECL_VIRTUAL_P (current_function_decl))
11995 tree virtual_size = cxx_sizeof (current_class_type);
11999 At the point of definition of a virtual destructor (including
12000 an implicit definition), non-placement operator delete shall
12001 be looked up in the scope of the destructor's class and if
12002 found shall be accessible and unambiguous. */
12003 exprstmt = build_op_delete_call(DELETE_EXPR, current_class_ptr,
12005 /*global_p=*/false,
12006 /*placement=*/NULL_TREE,
12007 /*alloc_fn=*/NULL_TREE);
12009 if_stmt = begin_if_stmt ();
12010 finish_if_stmt_cond (build2 (BIT_AND_EXPR, integer_type_node,
12011 current_in_charge_parm,
12014 finish_expr_stmt (exprstmt);
12015 finish_then_clause (if_stmt);
12016 finish_if_stmt (if_stmt);
12019 if (targetm.cxx.cdtor_returns_this ())
12023 val = DECL_ARGUMENTS (current_function_decl);
12024 val = build2 (MODIFY_EXPR, TREE_TYPE (val),
12025 DECL_RESULT (current_function_decl), val);
12026 /* Return the address of the object. */
12027 exprstmt = build_stmt (RETURN_EXPR, val);
12028 add_stmt (exprstmt);
12032 /* Do the necessary processing for the beginning of a function body, which
12033 in this case includes member-initializers, but not the catch clauses of
12034 a function-try-block. Currently, this means opening a binding level
12035 for the member-initializers (in a ctor) and member cleanups (in a dtor). */
12038 begin_function_body (void)
12042 if (! FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12045 if (processing_template_decl)
12046 /* Do nothing now. */;
12048 /* Always keep the BLOCK node associated with the outermost pair of
12049 curly braces of a function. These are needed for correct
12050 operation of dwarfout.c. */
12051 keep_next_level (true);
12053 stmt = begin_compound_stmt (BCS_FN_BODY);
12055 if (processing_template_decl)
12056 /* Do nothing now. */;
12057 else if (DECL_DESTRUCTOR_P (current_function_decl))
12058 begin_destructor_body ();
12063 /* Do the processing for the end of a function body. Currently, this means
12064 closing out the cleanups for fully-constructed bases and members, and in
12065 the case of the destructor, deleting the object if desired. Again, this
12066 is only meaningful for [cd]tors, since they are the only functions where
12067 there is a significant distinction between the main body and any
12068 function catch clauses. Handling, say, main() return semantics here
12069 would be wrong, as flowing off the end of a function catch clause for
12070 main() would also need to return 0. */
12073 finish_function_body (tree compstmt)
12075 if (compstmt == NULL_TREE)
12078 /* Close the block. */
12079 finish_compound_stmt (compstmt);
12081 if (processing_template_decl)
12082 /* Do nothing now. */;
12083 else if (DECL_CONSTRUCTOR_P (current_function_decl))
12084 finish_constructor_body ();
12085 else if (DECL_DESTRUCTOR_P (current_function_decl))
12086 finish_destructor_body ();
12089 /* Given a function, returns the BLOCK corresponding to the outermost level
12090 of curly braces, skipping the artificial block created for constructor
12094 outer_curly_brace_block (tree fndecl)
12096 tree block = BLOCK_SUBBLOCKS (DECL_INITIAL (fndecl));
12097 if (FUNCTION_NEEDS_BODY_BLOCK (current_function_decl))
12098 /* Skip the artificial function body block. */
12099 block = BLOCK_SUBBLOCKS (block);
12103 /* Finish up a function declaration and compile that function
12104 all the way to assembler language output. The free the storage
12105 for the function definition.
12107 FLAGS is a bitwise or of the following values:
12109 We just finished processing the body of an in-class inline
12110 function definition. (This processing will have taken place
12111 after the class definition is complete.) */
12114 finish_function (int flags)
12116 tree fndecl = current_function_decl;
12117 tree fntype, ctype = NULL_TREE;
12118 int inclass_inline = (flags & 2) != 0;
12121 /* When we get some parse errors, we can end up without a
12122 current_function_decl, so cope. */
12123 if (fndecl == NULL_TREE)
12124 return error_mark_node;
12126 gcc_assert (!defer_mark_used_calls);
12127 defer_mark_used_calls = true;
12129 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fndecl)
12130 && DECL_VIRTUAL_P (fndecl)
12131 && !processing_template_decl)
12133 tree fnclass = DECL_CONTEXT (fndecl);
12134 if (fndecl == CLASSTYPE_KEY_METHOD (fnclass))
12135 keyed_classes = tree_cons (NULL_TREE, fnclass, keyed_classes);
12138 nested = function_depth > 1;
12139 fntype = TREE_TYPE (fndecl);
12141 /* TREE_READONLY (fndecl) = 1;
12142 This caused &foo to be of type ptr-to-const-function
12143 which then got a warning when stored in a ptr-to-function variable. */
12145 gcc_assert (building_stmt_tree ());
12146 /* The current function is being defined, so its DECL_INITIAL should
12147 be set, and unless there's a multiple definition, it should be
12148 error_mark_node. */
12149 gcc_assert (DECL_INITIAL (fndecl) == error_mark_node);
12151 /* For a cloned function, we've already got all the code we need;
12152 there's no need to add any extra bits. */
12153 if (!DECL_CLONED_FUNCTION_P (fndecl))
12155 if (DECL_MAIN_P (current_function_decl))
12159 /* Make it so that `main' always returns 0 by default (or
12162 stmt = finish_return_stmt (integer_one_node);
12164 stmt = finish_return_stmt (integer_zero_node);
12166 /* Hack. We don't want the middle-end to warn that this
12167 return is unreachable, so put the statement on the
12170 location_t linezero = linemap_line_start (line_table, 0, 1);
12171 SET_EXPR_LOCATION (stmt, linezero);
12175 if (use_eh_spec_block (current_function_decl))
12176 finish_eh_spec_block (TYPE_RAISES_EXCEPTIONS
12177 (TREE_TYPE (current_function_decl)),
12178 current_eh_spec_block);
12181 /* If we're saving up tree structure, tie off the function now. */
12182 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
12184 finish_fname_decls ();
12186 /* If this function can't throw any exceptions, remember that. */
12187 if (!processing_template_decl
12188 && !cp_function_chain->can_throw
12189 && !flag_non_call_exceptions
12190 && !DECL_REPLACEABLE_P (fndecl))
12191 TREE_NOTHROW (fndecl) = 1;
12193 /* This must come after expand_function_end because cleanups might
12194 have declarations (from inline functions) that need to go into
12195 this function's blocks. */
12197 /* If the current binding level isn't the outermost binding level
12198 for this function, either there is a bug, or we have experienced
12199 syntax errors and the statement tree is malformed. */
12200 if (current_binding_level->kind != sk_function_parms)
12202 /* Make sure we have already experienced errors. */
12203 gcc_assert (errorcount);
12205 /* Throw away the broken statement tree and extra binding
12207 DECL_SAVED_TREE (fndecl) = alloc_stmt_list ();
12209 while (current_binding_level->kind != sk_function_parms)
12211 if (current_binding_level->kind == sk_class)
12212 pop_nested_class ();
12214 poplevel (0, 0, 0);
12217 poplevel (1, 0, 1);
12219 /* Statements should always be full-expressions at the outermost set
12220 of curly braces for a function. */
12221 gcc_assert (stmts_are_full_exprs_p ());
12223 /* Set up the named return value optimization, if we can. Candidate
12224 variables are selected in check_return_expr. */
12225 if (current_function_return_value)
12227 tree r = current_function_return_value;
12230 if (r != error_mark_node
12231 /* This is only worth doing for fns that return in memory--and
12232 simpler, since we don't have to worry about promoted modes. */
12233 && aggregate_value_p (TREE_TYPE (TREE_TYPE (fndecl)), fndecl)
12234 /* Only allow this for variables declared in the outer scope of
12235 the function so we know that their lifetime always ends with a
12236 return; see g++.dg/opt/nrv6.C. We could be more flexible if
12237 we were to do this optimization in tree-ssa. */
12238 && (outer = outer_curly_brace_block (fndecl))
12239 && chain_member (r, BLOCK_VARS (outer)))
12240 finalize_nrv (&DECL_SAVED_TREE (fndecl), r, DECL_RESULT (fndecl));
12242 current_function_return_value = NULL_TREE;
12245 /* Remember that we were in class scope. */
12246 if (current_class_name)
12247 ctype = current_class_type;
12249 /* Must mark the RESULT_DECL as being in this function. */
12250 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
12252 /* Set the BLOCK_SUPERCONTEXT of the outermost function scope to point
12253 to the FUNCTION_DECL node itself. */
12254 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
12256 /* Save away current state, if appropriate. */
12257 if (!processing_template_decl)
12258 save_function_data (fndecl);
12260 /* Complain if there's just no return statement. */
12261 if (warn_return_type
12262 && TREE_CODE (TREE_TYPE (fntype)) != VOID_TYPE
12263 && !dependent_type_p (TREE_TYPE (fntype))
12264 && !current_function_returns_value && !current_function_returns_null
12265 /* Don't complain if we abort or throw. */
12266 && !current_function_returns_abnormally
12267 && !DECL_NAME (DECL_RESULT (fndecl))
12268 && !TREE_NO_WARNING (fndecl)
12269 /* Structor return values (if any) are set by the compiler. */
12270 && !DECL_CONSTRUCTOR_P (fndecl)
12271 && !DECL_DESTRUCTOR_P (fndecl))
12273 warning (OPT_Wreturn_type,
12274 "no return statement in function returning non-void");
12275 TREE_NO_WARNING (fndecl) = 1;
12278 /* Store the end of the function, so that we get good line number
12279 info for the epilogue. */
12280 cfun->function_end_locus = input_location;
12282 /* Genericize before inlining. */
12283 if (!processing_template_decl)
12285 struct language_function *f = DECL_SAVED_FUNCTION_DATA (fndecl);
12286 cp_genericize (fndecl);
12287 /* Clear out the bits we don't need. */
12288 f->x_current_class_ptr = NULL;
12289 f->x_current_class_ref = NULL;
12290 f->x_eh_spec_block = NULL;
12291 f->x_in_charge_parm = NULL;
12292 f->x_vtt_parm = NULL;
12293 f->x_return_value = NULL;
12294 f->bindings = NULL;
12295 f->extern_decl_map = NULL;
12297 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
12298 c_warn_unused_result (gimple_body (fndecl));
12300 /* Clear out the bits we don't need. */
12301 local_names = NULL;
12303 /* We're leaving the context of this function, so zap cfun. It's still in
12304 DECL_STRUCT_FUNCTION, and we'll restore it in tree_rest_of_compilation. */
12306 current_function_decl = NULL;
12308 /* If this is an in-class inline definition, we may have to pop the
12309 bindings for the template parameters that we added in
12310 maybe_begin_member_template_processing when start_function was
12312 if (inclass_inline)
12313 maybe_end_member_template_processing ();
12315 /* Leave the scope of the class. */
12317 pop_nested_class ();
12323 /* Let the error reporting routines know that we're outside a
12324 function. For a nested function, this value is used in
12325 cxx_pop_function_context and then reset via pop_function_context. */
12326 current_function_decl = NULL_TREE;
12328 defer_mark_used_calls = false;
12329 if (deferred_mark_used_calls)
12334 for (i = 0; VEC_iterate (tree, deferred_mark_used_calls, i, decl); i++)
12336 VEC_free (tree, gc, deferred_mark_used_calls);
12342 /* Create the FUNCTION_DECL for a function definition.
12343 DECLSPECS and DECLARATOR are the parts of the declaration;
12344 they describe the return type and the name of the function,
12345 but twisted together in a fashion that parallels the syntax of C.
12347 This function creates a binding context for the function body
12348 as well as setting up the FUNCTION_DECL in current_function_decl.
12350 Returns a FUNCTION_DECL on success.
12352 If the DECLARATOR is not suitable for a function (it defines a datum
12353 instead), we return 0, which tells yyparse to report a parse error.
12355 May return void_type_node indicating that this method is actually
12356 a friend. See grokfield for more details.
12358 Came here with a `.pushlevel' .
12360 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
12361 CHANGES TO CODE IN `grokfield'. */
12364 start_method (cp_decl_specifier_seq *declspecs,
12365 const cp_declarator *declarator, tree attrlist)
12367 tree fndecl = grokdeclarator (declarator, declspecs, MEMFUNCDEF, 0,
12370 if (fndecl == error_mark_node)
12371 return error_mark_node;
12373 if (fndecl == NULL || TREE_CODE (fndecl) != FUNCTION_DECL)
12375 error ("invalid member function declaration");
12376 return error_mark_node;
12380 cplus_decl_attributes (&fndecl, attrlist, 0);
12382 /* Pass friends other than inline friend functions back. */
12383 if (fndecl == void_type_node)
12386 if (DECL_IN_AGGR_P (fndecl))
12388 if (DECL_CONTEXT (fndecl)
12389 && TREE_CODE (DECL_CONTEXT (fndecl)) != NAMESPACE_DECL)
12390 error ("%qD is already defined in class %qT", fndecl,
12391 DECL_CONTEXT (fndecl));
12392 return error_mark_node;
12395 check_template_shadow (fndecl);
12397 DECL_DECLARED_INLINE_P (fndecl) = 1;
12398 DECL_NO_INLINE_WARNING_P (fndecl) = 1;
12400 /* We process method specializations in finish_struct_1. */
12401 if (processing_template_decl && !DECL_TEMPLATE_SPECIALIZATION (fndecl))
12403 fndecl = push_template_decl (fndecl);
12404 if (fndecl == error_mark_node)
12408 if (! DECL_FRIEND_P (fndecl))
12410 if (TREE_CHAIN (fndecl))
12412 fndecl = copy_node (fndecl);
12413 TREE_CHAIN (fndecl) = NULL_TREE;
12417 finish_decl (fndecl, NULL_TREE, NULL_TREE);
12419 /* Make a place for the parms. */
12420 begin_scope (sk_function_parms, fndecl);
12422 DECL_IN_AGGR_P (fndecl) = 1;
12426 /* Go through the motions of finishing a function definition.
12427 We don't compile this method until after the whole class has
12430 FINISH_METHOD must return something that looks as though it
12431 came from GROKFIELD (since we are defining a method, after all).
12433 This is called after parsing the body of the function definition.
12434 STMTS is the chain of statements that makes up the function body.
12436 DECL is the ..._DECL that `start_method' provided. */
12439 finish_method (tree decl)
12441 tree fndecl = decl;
12446 if (decl == void_type_node)
12449 old_initial = DECL_INITIAL (fndecl);
12451 /* Undo the level for the parms (from start_method).
12452 This is like poplevel, but it causes nothing to be
12453 saved. Saving information here confuses symbol-table
12454 output routines. Besides, this information will
12455 be correctly output when this method is actually
12458 /* Clear out the meanings of the local variables of this level;
12459 also record in each decl which block it belongs to. */
12461 for (link = current_binding_level->names; link; link = TREE_CHAIN (link))
12463 if (DECL_NAME (link) != NULL_TREE)
12464 pop_binding (DECL_NAME (link), link);
12465 gcc_assert (TREE_CODE (link) != FUNCTION_DECL);
12466 DECL_CONTEXT (link) = NULL_TREE;
12469 poplevel (0, 0, 0);
12471 DECL_INITIAL (fndecl) = old_initial;
12473 /* We used to check if the context of FNDECL was different from
12474 current_class_type as another way to get inside here. This didn't work
12475 for String.cc in libg++. */
12476 if (DECL_FRIEND_P (fndecl))
12478 VEC_safe_push (tree, gc, CLASSTYPE_INLINE_FRIENDS (current_class_type),
12480 decl = void_type_node;
12487 /* VAR is a VAR_DECL. If its type is incomplete, remember VAR so that
12488 we can lay it out later, when and if its type becomes complete. */
12491 maybe_register_incomplete_var (tree var)
12493 gcc_assert (TREE_CODE (var) == VAR_DECL);
12495 /* Keep track of variables with incomplete types. */
12496 if (!processing_template_decl && TREE_TYPE (var) != error_mark_node
12497 && DECL_EXTERNAL (var))
12499 tree inner_type = TREE_TYPE (var);
12501 while (TREE_CODE (inner_type) == ARRAY_TYPE)
12502 inner_type = TREE_TYPE (inner_type);
12503 inner_type = TYPE_MAIN_VARIANT (inner_type);
12505 if ((!COMPLETE_TYPE_P (inner_type) && CLASS_TYPE_P (inner_type))
12506 /* RTTI TD entries are created while defining the type_info. */
12507 || (TYPE_LANG_SPECIFIC (inner_type)
12508 && TYPE_BEING_DEFINED (inner_type)))
12509 incomplete_vars = tree_cons (inner_type, var, incomplete_vars);
12513 /* Called when a class type (given by TYPE) is defined. If there are
12514 any existing VAR_DECLs whose type has been completed by this
12515 declaration, update them now. */
12518 complete_vars (tree type)
12520 tree *list = &incomplete_vars;
12522 gcc_assert (CLASS_TYPE_P (type));
12525 if (same_type_p (type, TREE_PURPOSE (*list)))
12527 tree var = TREE_VALUE (*list);
12528 tree type = TREE_TYPE (var);
12529 /* Complete the type of the variable. The VAR_DECL itself
12530 will be laid out in expand_expr. */
12531 complete_type (type);
12532 cp_apply_type_quals_to_decl (cp_type_quals (type), var);
12533 /* Remove this entry from the list. */
12534 *list = TREE_CHAIN (*list);
12537 list = &TREE_CHAIN (*list);
12540 /* Check for pending declarations which may have abstract type. */
12541 complete_type_check_abstract (type);
12544 /* If DECL is of a type which needs a cleanup, build and return an
12545 expression to perform that cleanup here. Return NULL_TREE if no
12546 cleanup need be done. */
12549 cxx_maybe_build_cleanup (tree decl)
12555 /* Assume no cleanup is required. */
12556 cleanup = NULL_TREE;
12558 if (error_operand_p (decl))
12561 /* Handle "__attribute__((cleanup))". We run the cleanup function
12562 before the destructor since the destructor is what actually
12563 terminates the lifetime of the object. */
12564 attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
12571 /* Get the name specified by the user for the cleanup function. */
12572 id = TREE_VALUE (TREE_VALUE (attr));
12573 /* Look up the name to find the cleanup function to call. It is
12574 important to use lookup_name here because that is what is
12575 used in c-common.c:handle_cleanup_attribute when performing
12576 initial checks on the attribute. Note that those checks
12577 include ensuring that the function found is not an overloaded
12578 function, or an object with an overloaded call operator,
12579 etc.; we can rely on the fact that the function found is an
12580 ordinary FUNCTION_DECL. */
12581 fn = lookup_name (id);
12582 arg = build_address (decl);
12584 cleanup = cp_build_function_call (fn, build_tree_list (NULL_TREE,
12586 tf_warning_or_error);
12588 /* Handle ordinary C++ destructors. */
12589 type = TREE_TYPE (decl);
12590 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
12592 int flags = LOOKUP_NORMAL|LOOKUP_DESTRUCTOR;
12593 bool has_vbases = (TREE_CODE (type) == RECORD_TYPE
12594 && CLASSTYPE_VBASECLASSES (type));
12598 if (TREE_CODE (type) == ARRAY_TYPE)
12601 addr = build_address (decl);
12603 /* Optimize for space over speed here. */
12604 if (!has_vbases || flag_expensive_optimizations)
12605 flags |= LOOKUP_NONVIRTUAL;
12607 call = build_delete (TREE_TYPE (addr), addr,
12608 sfk_complete_destructor, flags, 0);
12610 cleanup = build_compound_expr (cleanup, call);
12618 /* When a stmt has been parsed, this function is called. */
12625 /* DECL was originally constructed as a non-static member function,
12626 but turned out to be static. Update it accordingly. */
12629 revert_static_member_fn (tree decl)
12632 tree function = TREE_TYPE (decl);
12633 tree args = TYPE_ARG_TYPES (function);
12635 if (cp_type_quals (TREE_TYPE (TREE_VALUE (args)))
12636 != TYPE_UNQUALIFIED)
12637 error ("static member function %q#D declared with type qualifiers", decl);
12639 args = TREE_CHAIN (args);
12640 tmp = build_function_type (TREE_TYPE (function), args);
12641 tmp = build_qualified_type (tmp, cp_type_quals (function));
12642 tmp = build_exception_variant (tmp,
12643 TYPE_RAISES_EXCEPTIONS (function));
12644 TREE_TYPE (decl) = tmp;
12645 if (DECL_ARGUMENTS (decl))
12646 DECL_ARGUMENTS (decl) = TREE_CHAIN (DECL_ARGUMENTS (decl));
12647 DECL_STATIC_FUNCTION_P (decl) = 1;
12650 /* Return which tree structure is used by T, or TS_CP_GENERIC if T is
12651 one of the language-independent trees. */
12653 enum cp_tree_node_structure_enum
12654 cp_tree_node_structure (union lang_tree_node * t)
12656 switch (TREE_CODE (&t->generic))
12658 case DEFAULT_ARG: return TS_CP_DEFAULT_ARG;
12659 case IDENTIFIER_NODE: return TS_CP_IDENTIFIER;
12660 case OVERLOAD: return TS_CP_OVERLOAD;
12661 case TEMPLATE_PARM_INDEX: return TS_CP_TPI;
12662 case PTRMEM_CST: return TS_CP_PTRMEM;
12663 case BASELINK: return TS_CP_BASELINK;
12664 case STATIC_ASSERT: return TS_CP_STATIC_ASSERT;
12665 case ARGUMENT_PACK_SELECT: return TS_CP_ARGUMENT_PACK_SELECT;
12666 case TRAIT_EXPR: return TS_CP_TRAIT_EXPR;
12667 default: return TS_CP_GENERIC;
12671 /* Build the void_list_node (void_type_node having been created). */
12673 build_void_list_node (void)
12675 tree t = build_tree_list (NULL_TREE, void_type_node);
12680 cp_missing_noreturn_ok_p (tree decl)
12682 /* A missing noreturn is ok for the `main' function. */
12683 return DECL_MAIN_P (decl);
12686 /* Return the COMDAT group into which DECL should be placed. */
12689 cxx_comdat_group (tree decl)
12693 /* Virtual tables, construction virtual tables, and virtual table
12694 tables all go in a single COMDAT group, named after the primary
12696 if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
12697 name = DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (DECL_CONTEXT (decl)));
12698 /* For all other DECLs, the COMDAT group is the mangled name of the
12699 declaration itself. */
12702 while (DECL_THUNK_P (decl))
12704 /* If TARGET_USE_LOCAL_THUNK_ALIAS_P, use_thunk puts the thunk
12705 into the same section as the target function. In that case
12706 we must return target's name. */
12707 tree target = THUNK_TARGET (decl);
12708 if (TARGET_USE_LOCAL_THUNK_ALIAS_P (target)
12709 && DECL_SECTION_NAME (target) != NULL
12710 && DECL_ONE_ONLY (target))
12715 name = DECL_ASSEMBLER_NAME (decl);
12718 return IDENTIFIER_POINTER (name);
12721 #include "gt-cp-decl.h"