1 /* Handle initialization things in C++.
2 Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 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/>. */
23 /* High-level class interface. */
27 #include "coretypes.h"
39 static bool begin_init_stmts (tree *, tree *);
40 static tree finish_init_stmts (bool, tree, tree);
41 static void construct_virtual_base (tree, tree);
42 static void expand_aggr_init_1 (tree, tree, tree, tree, int, tsubst_flags_t);
43 static void expand_default_init (tree, tree, tree, tree, int, tsubst_flags_t);
44 static tree build_vec_delete_1 (tree, tree, tree, special_function_kind, int);
45 static void perform_member_init (tree, tree);
46 static tree build_builtin_delete_call (tree);
47 static int member_init_ok_or_else (tree, tree, tree);
48 static void expand_virtual_init (tree, tree);
49 static tree sort_mem_initializers (tree, tree);
50 static tree initializing_context (tree);
51 static void expand_cleanup_for_base (tree, tree);
52 static tree get_temp_regvar (tree, tree);
53 static tree dfs_initialize_vtbl_ptrs (tree, void *);
54 static tree build_dtor_call (tree, special_function_kind, int);
55 static tree build_field_list (tree, tree, int *);
56 static tree build_vtbl_address (tree);
58 /* We are about to generate some complex initialization code.
59 Conceptually, it is all a single expression. However, we may want
60 to include conditionals, loops, and other such statement-level
61 constructs. Therefore, we build the initialization code inside a
62 statement-expression. This function starts such an expression.
63 STMT_EXPR_P and COMPOUND_STMT_P are filled in by this function;
64 pass them back to finish_init_stmts when the expression is
68 begin_init_stmts (tree *stmt_expr_p, tree *compound_stmt_p)
70 bool is_global = !building_stmt_tree ();
72 *stmt_expr_p = begin_stmt_expr ();
73 *compound_stmt_p = begin_compound_stmt (BCS_NO_SCOPE);
78 /* Finish out the statement-expression begun by the previous call to
79 begin_init_stmts. Returns the statement-expression itself. */
82 finish_init_stmts (bool is_global, tree stmt_expr, tree compound_stmt)
84 finish_compound_stmt (compound_stmt);
86 stmt_expr = finish_stmt_expr (stmt_expr, true);
88 gcc_assert (!building_stmt_tree () == is_global);
95 /* Called from initialize_vtbl_ptrs via dfs_walk. BINFO is the base
96 which we want to initialize the vtable pointer for, DATA is
97 TREE_LIST whose TREE_VALUE is the this ptr expression. */
100 dfs_initialize_vtbl_ptrs (tree binfo, void *data)
102 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
103 return dfs_skip_bases;
105 if (!BINFO_PRIMARY_P (binfo) || BINFO_VIRTUAL_P (binfo))
107 tree base_ptr = TREE_VALUE ((tree) data);
109 base_ptr = build_base_path (PLUS_EXPR, base_ptr, binfo, /*nonnull=*/1);
111 expand_virtual_init (binfo, base_ptr);
117 /* Initialize all the vtable pointers in the object pointed to by
121 initialize_vtbl_ptrs (tree addr)
126 type = TREE_TYPE (TREE_TYPE (addr));
127 list = build_tree_list (type, addr);
129 /* Walk through the hierarchy, initializing the vptr in each base
130 class. We do these in pre-order because we can't find the virtual
131 bases for a class until we've initialized the vtbl for that
133 dfs_walk_once (TYPE_BINFO (type), dfs_initialize_vtbl_ptrs, NULL, list);
136 /* Return an expression for the zero-initialization of an object with
137 type T. This expression will either be a constant (in the case
138 that T is a scalar), or a CONSTRUCTOR (in the case that T is an
139 aggregate), or NULL (in the case that T does not require
140 initialization). In either case, the value can be used as
141 DECL_INITIAL for a decl of the indicated TYPE; it is a valid static
142 initializer. If NELTS is non-NULL, and TYPE is an ARRAY_TYPE, NELTS
143 is the number of elements in the array. If STATIC_STORAGE_P is
144 TRUE, initializers are only generated for entities for which
145 zero-initialization does not simply mean filling the storage with
149 build_zero_init (tree type, tree nelts, bool static_storage_p)
151 tree init = NULL_TREE;
155 To zero-initialize an object of type T means:
157 -- if T is a scalar type, the storage is set to the value of zero
160 -- if T is a non-union class type, the storage for each nonstatic
161 data member and each base-class subobject is zero-initialized.
163 -- if T is a union type, the storage for its first data member is
166 -- if T is an array type, the storage for each element is
169 -- if T is a reference type, no initialization is performed. */
171 gcc_assert (nelts == NULL_TREE || TREE_CODE (nelts) == INTEGER_CST);
173 if (type == error_mark_node)
175 else if (static_storage_p && zero_init_p (type))
176 /* In order to save space, we do not explicitly build initializers
177 for items that do not need them. GCC's semantics are that
178 items with static storage duration that are not otherwise
179 initialized are initialized to zero. */
181 else if (SCALAR_TYPE_P (type))
182 init = convert (type, integer_zero_node);
183 else if (CLASS_TYPE_P (type))
186 VEC(constructor_elt,gc) *v = NULL;
188 /* Iterate over the fields, building initializations. */
189 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
191 if (TREE_CODE (field) != FIELD_DECL)
194 /* Note that for class types there will be FIELD_DECLs
195 corresponding to base classes as well. Thus, iterating
196 over TYPE_FIELDs will result in correct initialization of
197 all of the subobjects. */
198 if (!static_storage_p || !zero_init_p (TREE_TYPE (field)))
200 tree value = build_zero_init (TREE_TYPE (field),
204 CONSTRUCTOR_APPEND_ELT(v, field, value);
207 /* For unions, only the first field is initialized. */
208 if (TREE_CODE (type) == UNION_TYPE)
212 /* Build a constructor to contain the initializations. */
213 init = build_constructor (type, v);
215 else if (TREE_CODE (type) == ARRAY_TYPE)
218 VEC(constructor_elt,gc) *v = NULL;
220 /* Iterate over the array elements, building initializations. */
222 max_index = fold_build2 (MINUS_EXPR, TREE_TYPE (nelts),
223 nelts, integer_one_node);
225 max_index = array_type_nelts (type);
227 /* If we have an error_mark here, we should just return error mark
228 as we don't know the size of the array yet. */
229 if (max_index == error_mark_node)
230 return error_mark_node;
231 gcc_assert (TREE_CODE (max_index) == INTEGER_CST);
233 /* A zero-sized array, which is accepted as an extension, will
234 have an upper bound of -1. */
235 if (!tree_int_cst_equal (max_index, integer_minus_one_node))
239 v = VEC_alloc (constructor_elt, gc, 1);
240 ce = VEC_quick_push (constructor_elt, v, NULL);
242 /* If this is a one element array, we just use a regular init. */
243 if (tree_int_cst_equal (size_zero_node, max_index))
244 ce->index = size_zero_node;
246 ce->index = build2 (RANGE_EXPR, sizetype, size_zero_node,
249 ce->value = build_zero_init (TREE_TYPE (type),
254 /* Build a constructor to contain the initializations. */
255 init = build_constructor (type, v);
257 else if (TREE_CODE (type) == VECTOR_TYPE)
258 init = fold_convert (type, integer_zero_node);
260 gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
262 /* In all cases, the initializer is a constant. */
264 TREE_CONSTANT (init) = 1;
269 /* Return a suitable initializer for value-initializing an object of type
270 TYPE, as described in [dcl.init]. */
273 build_value_init (tree type)
277 To value-initialize an object of type T means:
279 - if T is a class type (clause 9) with a user-provided constructor
280 (12.1), then the default constructor for T is called (and the
281 initialization is ill-formed if T has no accessible default
284 - if T is a non-union class type without a user-provided constructor,
285 then every non-static data member and base-class component of T is
286 value-initialized;92)
288 - if T is an array type, then each element is value-initialized;
290 - otherwise, the object is zero-initialized.
292 A program that calls for default-initialization or
293 value-initialization of an entity of reference type is ill-formed.
295 92) Value-initialization for such a class object may be implemented by
296 zero-initializing the object and then calling the default
299 if (CLASS_TYPE_P (type))
301 if (type_has_user_provided_constructor (type))
302 return build_aggr_init_expr
304 build_special_member_call (NULL_TREE, complete_ctor_identifier,
305 NULL_TREE, type, LOOKUP_NORMAL,
306 tf_warning_or_error));
307 else if (TREE_CODE (type) != UNION_TYPE && TYPE_NEEDS_CONSTRUCTING (type))
309 /* This is a class that needs constructing, but doesn't have
310 a user-provided constructor. So we need to zero-initialize
311 the object and then call the implicitly defined ctor.
312 This will be handled in simplify_aggr_init_expr. */
313 tree ctor = build_special_member_call
314 (NULL_TREE, complete_ctor_identifier,
315 NULL_TREE, type, LOOKUP_NORMAL, tf_warning_or_error);
317 ctor = build_aggr_init_expr (type, ctor);
318 AGGR_INIT_ZERO_FIRST (ctor) = 1;
322 return build_value_init_noctor (type);
325 /* Like build_value_init, but don't call the constructor for TYPE. Used
326 for base initializers. */
329 build_value_init_noctor (tree type)
331 if (CLASS_TYPE_P (type))
333 gcc_assert (!TYPE_NEEDS_CONSTRUCTING (type));
335 if (TREE_CODE (type) != UNION_TYPE)
338 VEC(constructor_elt,gc) *v = NULL;
340 /* Iterate over the fields, building initializations. */
341 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
345 if (TREE_CODE (field) != FIELD_DECL)
348 ftype = TREE_TYPE (field);
350 if (TREE_CODE (ftype) == REFERENCE_TYPE)
351 error ("value-initialization of reference");
353 /* We could skip vfields and fields of types with
354 user-defined constructors, but I think that won't improve
355 performance at all; it should be simpler in general just
356 to zero out the entire object than try to only zero the
357 bits that actually need it. */
359 /* Note that for class types there will be FIELD_DECLs
360 corresponding to base classes as well. Thus, iterating
361 over TYPE_FIELDs will result in correct initialization of
362 all of the subobjects. */
363 value = build_value_init (ftype);
366 CONSTRUCTOR_APPEND_ELT(v, field, value);
369 /* Build a constructor to contain the zero- initializations. */
370 return build_constructor (type, v);
373 else if (TREE_CODE (type) == ARRAY_TYPE)
375 VEC(constructor_elt,gc) *v = NULL;
377 /* Iterate over the array elements, building initializations. */
378 tree max_index = array_type_nelts (type);
380 /* If we have an error_mark here, we should just return error mark
381 as we don't know the size of the array yet. */
382 if (max_index == error_mark_node)
383 return error_mark_node;
384 gcc_assert (TREE_CODE (max_index) == INTEGER_CST);
386 /* A zero-sized array, which is accepted as an extension, will
387 have an upper bound of -1. */
388 if (!tree_int_cst_equal (max_index, integer_minus_one_node))
392 v = VEC_alloc (constructor_elt, gc, 1);
393 ce = VEC_quick_push (constructor_elt, v, NULL);
395 /* If this is a one element array, we just use a regular init. */
396 if (tree_int_cst_equal (size_zero_node, max_index))
397 ce->index = size_zero_node;
399 ce->index = build2 (RANGE_EXPR, sizetype, size_zero_node,
402 ce->value = build_value_init (TREE_TYPE (type));
404 /* The gimplifier can't deal with a RANGE_EXPR of TARGET_EXPRs. */
405 gcc_assert (TREE_CODE (ce->value) != TARGET_EXPR
406 && TREE_CODE (ce->value) != AGGR_INIT_EXPR);
409 /* Build a constructor to contain the initializations. */
410 return build_constructor (type, v);
413 return build_zero_init (type, NULL_TREE, /*static_storage_p=*/false);
416 /* Initialize MEMBER, a FIELD_DECL, with INIT, a TREE_LIST of
417 arguments. If TREE_LIST is void_type_node, an empty initializer
418 list was given; if NULL_TREE no initializer was given. */
421 perform_member_init (tree member, tree init)
424 tree type = TREE_TYPE (member);
426 /* Effective C++ rule 12 requires that all data members be
428 if (warn_ecpp && init == NULL_TREE && TREE_CODE (type) != ARRAY_TYPE)
429 warning (OPT_Weffc__, "%J%qD should be initialized in the member initialization "
430 "list", current_function_decl, member);
432 /* Get an lvalue for the data member. */
433 decl = build_class_member_access_expr (current_class_ref, member,
434 /*access_path=*/NULL_TREE,
435 /*preserve_reference=*/true,
436 tf_warning_or_error);
437 if (decl == error_mark_node)
440 if (init == void_type_node)
442 /* mem() means value-initialization. */
443 if (TREE_CODE (type) == ARRAY_TYPE)
445 init = build_vec_init (decl, NULL_TREE, NULL_TREE,
446 /*explicit_value_init_p=*/true,
448 tf_warning_or_error);
449 finish_expr_stmt (init);
453 if (TREE_CODE (type) == REFERENCE_TYPE)
454 permerror (input_location, "%Jvalue-initialization of %q#D, "
455 "which has reference type",
456 current_function_decl, member);
459 init = build2 (INIT_EXPR, type, decl, build_value_init (type));
460 finish_expr_stmt (init);
464 /* Deal with this here, as we will get confused if we try to call the
465 assignment op for an anonymous union. This can happen in a
466 synthesized copy constructor. */
467 else if (ANON_AGGR_TYPE_P (type))
471 init = build2 (INIT_EXPR, type, decl, TREE_VALUE (init));
472 finish_expr_stmt (init);
475 else if (TYPE_NEEDS_CONSTRUCTING (type))
477 if (init != NULL_TREE
478 && TREE_CODE (type) == ARRAY_TYPE
479 && TREE_CHAIN (init) == NULL_TREE
480 && TREE_CODE (TREE_TYPE (TREE_VALUE (init))) == ARRAY_TYPE)
482 /* Initialization of one array from another. */
483 finish_expr_stmt (build_vec_init (decl, NULL_TREE, TREE_VALUE (init),
484 /*explicit_value_init_p=*/false,
486 tf_warning_or_error));
490 if (CP_TYPE_CONST_P (type)
492 && !type_has_user_provided_default_constructor (type))
493 /* TYPE_NEEDS_CONSTRUCTING can be set just because we have a
494 vtable; still give this diagnostic. */
495 permerror (input_location, "%Juninitialized member %qD with %<const%> type %qT",
496 current_function_decl, member, type);
497 finish_expr_stmt (build_aggr_init (decl, init, 0,
498 tf_warning_or_error));
503 if (init == NULL_TREE)
505 /* member traversal: note it leaves init NULL */
506 if (TREE_CODE (type) == REFERENCE_TYPE)
507 permerror (input_location, "%Juninitialized reference member %qD",
508 current_function_decl, member);
509 else if (CP_TYPE_CONST_P (type))
510 permerror (input_location, "%Juninitialized member %qD with %<const%> type %qT",
511 current_function_decl, member, type);
513 else if (TREE_CODE (init) == TREE_LIST)
514 /* There was an explicit member initialization. Do some work
516 init = build_x_compound_expr_from_list (init, "member initializer");
519 finish_expr_stmt (cp_build_modify_expr (decl, INIT_EXPR, init,
520 tf_warning_or_error));
523 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
527 expr = build_class_member_access_expr (current_class_ref, member,
528 /*access_path=*/NULL_TREE,
529 /*preserve_reference=*/false,
530 tf_warning_or_error);
531 expr = build_delete (type, expr, sfk_complete_destructor,
532 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
534 if (expr != error_mark_node)
535 finish_eh_cleanup (expr);
539 /* Returns a TREE_LIST containing (as the TREE_PURPOSE of each node) all
540 the FIELD_DECLs on the TYPE_FIELDS list for T, in reverse order. */
543 build_field_list (tree t, tree list, int *uses_unions_p)
549 /* Note whether or not T is a union. */
550 if (TREE_CODE (t) == UNION_TYPE)
553 for (fields = TYPE_FIELDS (t); fields; fields = TREE_CHAIN (fields))
555 /* Skip CONST_DECLs for enumeration constants and so forth. */
556 if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields))
559 /* Keep track of whether or not any fields are unions. */
560 if (TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE)
563 /* For an anonymous struct or union, we must recursively
564 consider the fields of the anonymous type. They can be
565 directly initialized from the constructor. */
566 if (ANON_AGGR_TYPE_P (TREE_TYPE (fields)))
568 /* Add this field itself. Synthesized copy constructors
569 initialize the entire aggregate. */
570 list = tree_cons (fields, NULL_TREE, list);
571 /* And now add the fields in the anonymous aggregate. */
572 list = build_field_list (TREE_TYPE (fields), list,
575 /* Add this field. */
576 else if (DECL_NAME (fields))
577 list = tree_cons (fields, NULL_TREE, list);
583 /* The MEM_INITS are a TREE_LIST. The TREE_PURPOSE of each list gives
584 a FIELD_DECL or BINFO in T that needs initialization. The
585 TREE_VALUE gives the initializer, or list of initializer arguments.
587 Return a TREE_LIST containing all of the initializations required
588 for T, in the order in which they should be performed. The output
589 list has the same format as the input. */
592 sort_mem_initializers (tree t, tree mem_inits)
595 tree base, binfo, base_binfo;
598 VEC(tree,gc) *vbases;
602 /* Build up a list of initializations. The TREE_PURPOSE of entry
603 will be the subobject (a FIELD_DECL or BINFO) to initialize. The
604 TREE_VALUE will be the constructor arguments, or NULL if no
605 explicit initialization was provided. */
606 sorted_inits = NULL_TREE;
608 /* Process the virtual bases. */
609 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
610 VEC_iterate (tree, vbases, i, base); i++)
611 sorted_inits = tree_cons (base, NULL_TREE, sorted_inits);
613 /* Process the direct bases. */
614 for (binfo = TYPE_BINFO (t), i = 0;
615 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
616 if (!BINFO_VIRTUAL_P (base_binfo))
617 sorted_inits = tree_cons (base_binfo, NULL_TREE, sorted_inits);
619 /* Process the non-static data members. */
620 sorted_inits = build_field_list (t, sorted_inits, &uses_unions_p);
621 /* Reverse the entire list of initializations, so that they are in
622 the order that they will actually be performed. */
623 sorted_inits = nreverse (sorted_inits);
625 /* If the user presented the initializers in an order different from
626 that in which they will actually occur, we issue a warning. Keep
627 track of the next subobject which can be explicitly initialized
628 without issuing a warning. */
629 next_subobject = sorted_inits;
631 /* Go through the explicit initializers, filling in TREE_PURPOSE in
633 for (init = mem_inits; init; init = TREE_CHAIN (init))
638 subobject = TREE_PURPOSE (init);
640 /* If the explicit initializers are in sorted order, then
641 SUBOBJECT will be NEXT_SUBOBJECT, or something following
643 for (subobject_init = next_subobject;
645 subobject_init = TREE_CHAIN (subobject_init))
646 if (TREE_PURPOSE (subobject_init) == subobject)
649 /* Issue a warning if the explicit initializer order does not
650 match that which will actually occur.
651 ??? Are all these on the correct lines? */
652 if (warn_reorder && !subobject_init)
654 if (TREE_CODE (TREE_PURPOSE (next_subobject)) == FIELD_DECL)
655 warning (OPT_Wreorder, "%q+D will be initialized after",
656 TREE_PURPOSE (next_subobject));
658 warning (OPT_Wreorder, "base %qT will be initialized after",
659 TREE_PURPOSE (next_subobject));
660 if (TREE_CODE (subobject) == FIELD_DECL)
661 warning (OPT_Wreorder, " %q+#D", subobject);
663 warning (OPT_Wreorder, " base %qT", subobject);
664 warning (OPT_Wreorder, "%J when initialized here", current_function_decl);
667 /* Look again, from the beginning of the list. */
670 subobject_init = sorted_inits;
671 while (TREE_PURPOSE (subobject_init) != subobject)
672 subobject_init = TREE_CHAIN (subobject_init);
675 /* It is invalid to initialize the same subobject more than
677 if (TREE_VALUE (subobject_init))
679 if (TREE_CODE (subobject) == FIELD_DECL)
680 error ("%Jmultiple initializations given for %qD",
681 current_function_decl, subobject);
683 error ("%Jmultiple initializations given for base %qT",
684 current_function_decl, subobject);
687 /* Record the initialization. */
688 TREE_VALUE (subobject_init) = TREE_VALUE (init);
689 next_subobject = subobject_init;
694 If a ctor-initializer specifies more than one mem-initializer for
695 multiple members of the same union (including members of
696 anonymous unions), the ctor-initializer is ill-formed. */
699 tree last_field = NULL_TREE;
700 for (init = sorted_inits; init; init = TREE_CHAIN (init))
706 /* Skip uninitialized members and base classes. */
707 if (!TREE_VALUE (init)
708 || TREE_CODE (TREE_PURPOSE (init)) != FIELD_DECL)
710 /* See if this field is a member of a union, or a member of a
711 structure contained in a union, etc. */
712 field = TREE_PURPOSE (init);
713 for (field_type = DECL_CONTEXT (field);
714 !same_type_p (field_type, t);
715 field_type = TYPE_CONTEXT (field_type))
716 if (TREE_CODE (field_type) == UNION_TYPE)
718 /* If this field is not a member of a union, skip it. */
719 if (TREE_CODE (field_type) != UNION_TYPE)
722 /* It's only an error if we have two initializers for the same
730 /* See if LAST_FIELD and the field initialized by INIT are
731 members of the same union. If so, there's a problem,
732 unless they're actually members of the same structure
733 which is itself a member of a union. For example, given:
735 union { struct { int i; int j; }; };
737 initializing both `i' and `j' makes sense. */
738 field_type = DECL_CONTEXT (field);
742 tree last_field_type;
744 last_field_type = DECL_CONTEXT (last_field);
747 if (same_type_p (last_field_type, field_type))
749 if (TREE_CODE (field_type) == UNION_TYPE)
750 error ("%Jinitializations for multiple members of %qT",
751 current_function_decl, last_field_type);
756 if (same_type_p (last_field_type, t))
759 last_field_type = TYPE_CONTEXT (last_field_type);
762 /* If we've reached the outermost class, then we're
764 if (same_type_p (field_type, t))
767 field_type = TYPE_CONTEXT (field_type);
778 /* Initialize all bases and members of CURRENT_CLASS_TYPE. MEM_INITS
779 is a TREE_LIST giving the explicit mem-initializer-list for the
780 constructor. The TREE_PURPOSE of each entry is a subobject (a
781 FIELD_DECL or a BINFO) of the CURRENT_CLASS_TYPE. The TREE_VALUE
782 is a TREE_LIST giving the arguments to the constructor or
783 void_type_node for an empty list of arguments. */
786 emit_mem_initializers (tree mem_inits)
788 /* We will already have issued an error message about the fact that
789 the type is incomplete. */
790 if (!COMPLETE_TYPE_P (current_class_type))
793 /* Sort the mem-initializers into the order in which the
794 initializations should be performed. */
795 mem_inits = sort_mem_initializers (current_class_type, mem_inits);
797 in_base_initializer = 1;
799 /* Initialize base classes. */
801 && TREE_CODE (TREE_PURPOSE (mem_inits)) != FIELD_DECL)
803 tree subobject = TREE_PURPOSE (mem_inits);
804 tree arguments = TREE_VALUE (mem_inits);
806 /* If these initializations are taking place in a copy constructor,
807 the base class should probably be explicitly initialized if there
808 is a user-defined constructor in the base class (other than the
809 default constructor, which will be called anyway). */
810 if (extra_warnings && !arguments
811 && DECL_COPY_CONSTRUCTOR_P (current_function_decl)
812 && type_has_user_nondefault_constructor (BINFO_TYPE (subobject)))
813 warning (OPT_Wextra, "%Jbase class %q#T should be explicitly initialized in the "
815 current_function_decl, BINFO_TYPE (subobject));
817 /* Initialize the base. */
818 if (BINFO_VIRTUAL_P (subobject))
819 construct_virtual_base (subobject, arguments);
824 base_addr = build_base_path (PLUS_EXPR, current_class_ptr,
826 expand_aggr_init_1 (subobject, NULL_TREE,
827 cp_build_indirect_ref (base_addr, NULL,
828 tf_warning_or_error),
831 tf_warning_or_error);
832 expand_cleanup_for_base (subobject, NULL_TREE);
835 mem_inits = TREE_CHAIN (mem_inits);
837 in_base_initializer = 0;
839 /* Initialize the vptrs. */
840 initialize_vtbl_ptrs (current_class_ptr);
842 /* Initialize the data members. */
845 perform_member_init (TREE_PURPOSE (mem_inits),
846 TREE_VALUE (mem_inits));
847 mem_inits = TREE_CHAIN (mem_inits);
851 /* Returns the address of the vtable (i.e., the value that should be
852 assigned to the vptr) for BINFO. */
855 build_vtbl_address (tree binfo)
857 tree binfo_for = binfo;
860 if (BINFO_VPTR_INDEX (binfo) && BINFO_VIRTUAL_P (binfo))
861 /* If this is a virtual primary base, then the vtable we want to store
862 is that for the base this is being used as the primary base of. We
863 can't simply skip the initialization, because we may be expanding the
864 inits of a subobject constructor where the virtual base layout
866 while (BINFO_PRIMARY_P (binfo_for))
867 binfo_for = BINFO_INHERITANCE_CHAIN (binfo_for);
869 /* Figure out what vtable BINFO's vtable is based on, and mark it as
871 vtbl = get_vtbl_decl_for_binfo (binfo_for);
872 assemble_external (vtbl);
873 TREE_USED (vtbl) = 1;
875 /* Now compute the address to use when initializing the vptr. */
876 vtbl = unshare_expr (BINFO_VTABLE (binfo_for));
877 if (TREE_CODE (vtbl) == VAR_DECL)
878 vtbl = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (vtbl)), vtbl);
883 /* This code sets up the virtual function tables appropriate for
884 the pointer DECL. It is a one-ply initialization.
886 BINFO is the exact type that DECL is supposed to be. In
887 multiple inheritance, this might mean "C's A" if C : A, B. */
890 expand_virtual_init (tree binfo, tree decl)
895 /* Compute the initializer for vptr. */
896 vtbl = build_vtbl_address (binfo);
898 /* We may get this vptr from a VTT, if this is a subobject
899 constructor or subobject destructor. */
900 vtt_index = BINFO_VPTR_INDEX (binfo);
906 /* Compute the value to use, when there's a VTT. */
907 vtt_parm = current_vtt_parm;
908 vtbl2 = build2 (POINTER_PLUS_EXPR,
909 TREE_TYPE (vtt_parm),
912 vtbl2 = cp_build_indirect_ref (vtbl2, NULL, tf_warning_or_error);
913 vtbl2 = convert (TREE_TYPE (vtbl), vtbl2);
915 /* The actual initializer is the VTT value only in the subobject
916 constructor. In maybe_clone_body we'll substitute NULL for
917 the vtt_parm in the case of the non-subobject constructor. */
918 vtbl = build3 (COND_EXPR,
920 build2 (EQ_EXPR, boolean_type_node,
921 current_in_charge_parm, integer_zero_node),
926 /* Compute the location of the vtpr. */
927 vtbl_ptr = build_vfield_ref (cp_build_indirect_ref (decl, NULL,
928 tf_warning_or_error),
930 gcc_assert (vtbl_ptr != error_mark_node);
932 /* Assign the vtable to the vptr. */
933 vtbl = convert_force (TREE_TYPE (vtbl_ptr), vtbl, 0);
934 finish_expr_stmt (cp_build_modify_expr (vtbl_ptr, NOP_EXPR, vtbl,
935 tf_warning_or_error));
938 /* If an exception is thrown in a constructor, those base classes already
939 constructed must be destroyed. This function creates the cleanup
940 for BINFO, which has just been constructed. If FLAG is non-NULL,
941 it is a DECL which is nonzero when this base needs to be
945 expand_cleanup_for_base (tree binfo, tree flag)
949 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (binfo)))
952 /* Call the destructor. */
953 expr = build_special_member_call (current_class_ref,
954 base_dtor_identifier,
957 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL,
958 tf_warning_or_error);
960 expr = fold_build3 (COND_EXPR, void_type_node,
961 c_common_truthvalue_conversion (input_location, flag),
962 expr, integer_zero_node);
964 finish_eh_cleanup (expr);
967 /* Construct the virtual base-class VBASE passing the ARGUMENTS to its
971 construct_virtual_base (tree vbase, tree arguments)
977 /* If there are virtual base classes with destructors, we need to
978 emit cleanups to destroy them if an exception is thrown during
979 the construction process. These exception regions (i.e., the
980 period during which the cleanups must occur) begin from the time
981 the construction is complete to the end of the function. If we
982 create a conditional block in which to initialize the
983 base-classes, then the cleanup region for the virtual base begins
984 inside a block, and ends outside of that block. This situation
985 confuses the sjlj exception-handling code. Therefore, we do not
986 create a single conditional block, but one for each
987 initialization. (That way the cleanup regions always begin
988 in the outer block.) We trust the back end to figure out
989 that the FLAG will not change across initializations, and
990 avoid doing multiple tests. */
991 flag = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl));
992 inner_if_stmt = begin_if_stmt ();
993 finish_if_stmt_cond (flag, inner_if_stmt);
995 /* Compute the location of the virtual base. If we're
996 constructing virtual bases, then we must be the most derived
997 class. Therefore, we don't have to look up the virtual base;
998 we already know where it is. */
999 exp = convert_to_base_statically (current_class_ref, vbase);
1001 expand_aggr_init_1 (vbase, current_class_ref, exp, arguments,
1002 LOOKUP_COMPLAIN, tf_warning_or_error);
1003 finish_then_clause (inner_if_stmt);
1004 finish_if_stmt (inner_if_stmt);
1006 expand_cleanup_for_base (vbase, flag);
1009 /* Find the context in which this FIELD can be initialized. */
1012 initializing_context (tree field)
1014 tree t = DECL_CONTEXT (field);
1016 /* Anonymous union members can be initialized in the first enclosing
1017 non-anonymous union context. */
1018 while (t && ANON_AGGR_TYPE_P (t))
1019 t = TYPE_CONTEXT (t);
1023 /* Function to give error message if member initialization specification
1024 is erroneous. FIELD is the member we decided to initialize.
1025 TYPE is the type for which the initialization is being performed.
1026 FIELD must be a member of TYPE.
1028 MEMBER_NAME is the name of the member. */
1031 member_init_ok_or_else (tree field, tree type, tree member_name)
1033 if (field == error_mark_node)
1037 error ("class %qT does not have any field named %qD", type,
1041 if (TREE_CODE (field) == VAR_DECL)
1043 error ("%q#D is a static data member; it can only be "
1044 "initialized at its definition",
1048 if (TREE_CODE (field) != FIELD_DECL)
1050 error ("%q#D is not a non-static data member of %qT",
1054 if (initializing_context (field) != type)
1056 error ("class %qT does not have any field named %qD", type,
1064 /* NAME is a FIELD_DECL, an IDENTIFIER_NODE which names a field, or it
1065 is a _TYPE node or TYPE_DECL which names a base for that type.
1066 Check the validity of NAME, and return either the base _TYPE, base
1067 binfo, or the FIELD_DECL of the member. If NAME is invalid, return
1068 NULL_TREE and issue a diagnostic.
1070 An old style unnamed direct single base construction is permitted,
1071 where NAME is NULL. */
1074 expand_member_init (tree name)
1079 if (!current_class_ref)
1084 /* This is an obsolete unnamed base class initializer. The
1085 parser will already have warned about its use. */
1086 switch (BINFO_N_BASE_BINFOS (TYPE_BINFO (current_class_type)))
1089 error ("unnamed initializer for %qT, which has no base classes",
1090 current_class_type);
1093 basetype = BINFO_TYPE
1094 (BINFO_BASE_BINFO (TYPE_BINFO (current_class_type), 0));
1097 error ("unnamed initializer for %qT, which uses multiple inheritance",
1098 current_class_type);
1102 else if (TYPE_P (name))
1104 basetype = TYPE_MAIN_VARIANT (name);
1105 name = TYPE_NAME (name);
1107 else if (TREE_CODE (name) == TYPE_DECL)
1108 basetype = TYPE_MAIN_VARIANT (TREE_TYPE (name));
1110 basetype = NULL_TREE;
1119 if (current_template_parms)
1122 class_binfo = TYPE_BINFO (current_class_type);
1123 direct_binfo = NULL_TREE;
1124 virtual_binfo = NULL_TREE;
1126 /* Look for a direct base. */
1127 for (i = 0; BINFO_BASE_ITERATE (class_binfo, i, direct_binfo); ++i)
1128 if (SAME_BINFO_TYPE_P (BINFO_TYPE (direct_binfo), basetype))
1131 /* Look for a virtual base -- unless the direct base is itself
1133 if (!direct_binfo || !BINFO_VIRTUAL_P (direct_binfo))
1134 virtual_binfo = binfo_for_vbase (basetype, current_class_type);
1136 /* [class.base.init]
1138 If a mem-initializer-id is ambiguous because it designates
1139 both a direct non-virtual base class and an inherited virtual
1140 base class, the mem-initializer is ill-formed. */
1141 if (direct_binfo && virtual_binfo)
1143 error ("%qD is both a direct base and an indirect virtual base",
1148 if (!direct_binfo && !virtual_binfo)
1150 if (CLASSTYPE_VBASECLASSES (current_class_type))
1151 error ("type %qT is not a direct or virtual base of %qT",
1152 basetype, current_class_type);
1154 error ("type %qT is not a direct base of %qT",
1155 basetype, current_class_type);
1159 return direct_binfo ? direct_binfo : virtual_binfo;
1163 if (TREE_CODE (name) == IDENTIFIER_NODE)
1164 field = lookup_field (current_class_type, name, 1, false);
1168 if (member_init_ok_or_else (field, current_class_type, name))
1175 /* This is like `expand_member_init', only it stores one aggregate
1178 INIT comes in two flavors: it is either a value which
1179 is to be stored in EXP, or it is a parameter list
1180 to go to a constructor, which will operate on EXP.
1181 If INIT is not a parameter list for a constructor, then set
1182 LOOKUP_ONLYCONVERTING.
1183 If FLAGS is LOOKUP_ONLYCONVERTING then it is the = init form of
1184 the initializer, if FLAGS is 0, then it is the (init) form.
1185 If `init' is a CONSTRUCTOR, then we emit a warning message,
1186 explaining that such initializations are invalid.
1188 If INIT resolves to a CALL_EXPR which happens to return
1189 something of the type we are looking for, then we know
1190 that we can safely use that call to perform the
1193 The virtual function table pointer cannot be set up here, because
1194 we do not really know its type.
1196 This never calls operator=().
1198 When initializing, nothing is CONST.
1200 A default copy constructor may have to be used to perform the
1203 A constructor or a conversion operator may have to be used to
1204 perform the initialization, but not both, as it would be ambiguous. */
1207 build_aggr_init (tree exp, tree init, int flags, tsubst_flags_t complain)
1212 tree type = TREE_TYPE (exp);
1213 int was_const = TREE_READONLY (exp);
1214 int was_volatile = TREE_THIS_VOLATILE (exp);
1217 if (init == error_mark_node)
1218 return error_mark_node;
1220 TREE_READONLY (exp) = 0;
1221 TREE_THIS_VOLATILE (exp) = 0;
1223 if (init && TREE_CODE (init) != TREE_LIST)
1224 flags |= LOOKUP_ONLYCONVERTING;
1226 if (TREE_CODE (type) == ARRAY_TYPE)
1230 /* An array may not be initialized use the parenthesized
1231 initialization form -- unless the initializer is "()". */
1232 if (init && TREE_CODE (init) == TREE_LIST)
1234 if (complain & tf_error)
1235 error ("bad array initializer");
1236 return error_mark_node;
1238 /* Must arrange to initialize each element of EXP
1239 from elements of INIT. */
1240 itype = init ? TREE_TYPE (init) : NULL_TREE;
1241 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
1242 TREE_TYPE (exp) = TYPE_MAIN_VARIANT (type);
1243 if (itype && cp_type_quals (itype) != TYPE_UNQUALIFIED)
1244 itype = TREE_TYPE (init) = TYPE_MAIN_VARIANT (itype);
1245 stmt_expr = build_vec_init (exp, NULL_TREE, init,
1246 /*explicit_value_init_p=*/false,
1247 itype && same_type_p (itype,
1250 TREE_READONLY (exp) = was_const;
1251 TREE_THIS_VOLATILE (exp) = was_volatile;
1252 TREE_TYPE (exp) = type;
1254 TREE_TYPE (init) = itype;
1258 if (TREE_CODE (exp) == VAR_DECL || TREE_CODE (exp) == PARM_DECL)
1259 /* Just know that we've seen something for this node. */
1260 TREE_USED (exp) = 1;
1262 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
1263 destroy_temps = stmts_are_full_exprs_p ();
1264 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
1265 expand_aggr_init_1 (TYPE_BINFO (type), exp, exp,
1266 init, LOOKUP_NORMAL|flags, complain);
1267 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
1268 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
1269 TREE_READONLY (exp) = was_const;
1270 TREE_THIS_VOLATILE (exp) = was_volatile;
1276 expand_default_init (tree binfo, tree true_exp, tree exp, tree init, int flags,
1277 tsubst_flags_t complain)
1279 tree type = TREE_TYPE (exp);
1282 /* It fails because there may not be a constructor which takes
1283 its own type as the first (or only parameter), but which does
1284 take other types via a conversion. So, if the thing initializing
1285 the expression is a unit element of type X, first try X(X&),
1286 followed by initialization by X. If neither of these work
1287 out, then look hard. */
1291 if (init && TREE_CODE (init) != TREE_LIST
1292 && (flags & LOOKUP_ONLYCONVERTING))
1294 /* Base subobjects should only get direct-initialization. */
1295 gcc_assert (true_exp == exp);
1297 if (flags & DIRECT_BIND)
1298 /* Do nothing. We hit this in two cases: Reference initialization,
1299 where we aren't initializing a real variable, so we don't want
1300 to run a new constructor; and catching an exception, where we
1301 have already built up the constructor call so we could wrap it
1302 in an exception region. */;
1303 else if (BRACE_ENCLOSED_INITIALIZER_P (init)
1304 && CP_AGGREGATE_TYPE_P (type))
1306 /* A brace-enclosed initializer for an aggregate. */
1307 init = digest_init (type, init);
1310 init = ocp_convert (type, init, CONV_IMPLICIT|CONV_FORCE_TEMP, flags);
1312 if (TREE_CODE (init) == MUST_NOT_THROW_EXPR)
1313 /* We need to protect the initialization of a catch parm with a
1314 call to terminate(), which shows up as a MUST_NOT_THROW_EXPR
1315 around the TARGET_EXPR for the copy constructor. See
1316 initialize_handler_parm. */
1318 TREE_OPERAND (init, 0) = build2 (INIT_EXPR, TREE_TYPE (exp), exp,
1319 TREE_OPERAND (init, 0));
1320 TREE_TYPE (init) = void_type_node;
1323 init = build2 (INIT_EXPR, TREE_TYPE (exp), exp, init);
1324 TREE_SIDE_EFFECTS (init) = 1;
1325 finish_expr_stmt (init);
1329 if (init == NULL_TREE
1330 || (TREE_CODE (init) == TREE_LIST && ! TREE_TYPE (init)))
1334 init = TREE_VALUE (parms);
1337 parms = build_tree_list (NULL_TREE, init);
1339 if (true_exp == exp)
1340 ctor_name = complete_ctor_identifier;
1342 ctor_name = base_ctor_identifier;
1344 rval = build_special_member_call (exp, ctor_name, parms, binfo, flags,
1346 if (TREE_SIDE_EFFECTS (rval))
1347 finish_expr_stmt (convert_to_void (rval, NULL, complain));
1350 /* This function is responsible for initializing EXP with INIT
1353 BINFO is the binfo of the type for who we are performing the
1354 initialization. For example, if W is a virtual base class of A and B,
1356 If we are initializing B, then W must contain B's W vtable, whereas
1357 were we initializing C, W must contain C's W vtable.
1359 TRUE_EXP is nonzero if it is the true expression being initialized.
1360 In this case, it may be EXP, or may just contain EXP. The reason we
1361 need this is because if EXP is a base element of TRUE_EXP, we
1362 don't necessarily know by looking at EXP where its virtual
1363 baseclass fields should really be pointing. But we do know
1364 from TRUE_EXP. In constructors, we don't know anything about
1365 the value being initialized.
1367 FLAGS is just passed to `build_new_method_call'. See that function
1368 for its description. */
1371 expand_aggr_init_1 (tree binfo, tree true_exp, tree exp, tree init, int flags,
1372 tsubst_flags_t complain)
1374 tree type = TREE_TYPE (exp);
1376 gcc_assert (init != error_mark_node && type != error_mark_node);
1377 gcc_assert (building_stmt_tree ());
1379 /* Use a function returning the desired type to initialize EXP for us.
1380 If the function is a constructor, and its first argument is
1381 NULL_TREE, know that it was meant for us--just slide exp on
1382 in and expand the constructor. Constructors now come
1385 if (init && TREE_CODE (exp) == VAR_DECL
1386 && COMPOUND_LITERAL_P (init))
1388 /* If store_init_value returns NULL_TREE, the INIT has been
1389 recorded as the DECL_INITIAL for EXP. That means there's
1390 nothing more we have to do. */
1391 init = store_init_value (exp, init);
1393 finish_expr_stmt (init);
1397 /* If an explicit -- but empty -- initializer list was present,
1398 that's value-initialization. */
1399 if (init == void_type_node)
1401 /* If there's a user-provided constructor, we just call that. */
1402 if (type_has_user_provided_constructor (type))
1403 /* Fall through. */;
1404 /* If there isn't, but we still need to call the constructor,
1405 zero out the object first. */
1406 else if (TYPE_NEEDS_CONSTRUCTING (type))
1408 init = build_zero_init (type, NULL_TREE, /*static_storage_p=*/false);
1409 init = build2 (INIT_EXPR, type, exp, init);
1410 finish_expr_stmt (init);
1411 /* And then call the constructor. */
1413 /* If we don't need to mess with the constructor at all,
1414 then just zero out the object and we're done. */
1417 init = build2 (INIT_EXPR, type, exp, build_value_init_noctor (type));
1418 finish_expr_stmt (init);
1424 /* We know that expand_default_init can handle everything we want
1426 expand_default_init (binfo, true_exp, exp, init, flags, complain);
1429 /* Report an error if TYPE is not a user-defined, class type. If
1430 OR_ELSE is nonzero, give an error message. */
1433 is_class_type (tree type, int or_else)
1435 if (type == error_mark_node)
1438 if (! CLASS_TYPE_P (type))
1441 error ("%qT is not a class type", type);
1448 get_type_value (tree name)
1450 if (name == error_mark_node)
1453 if (IDENTIFIER_HAS_TYPE_VALUE (name))
1454 return IDENTIFIER_TYPE_VALUE (name);
1459 /* Build a reference to a member of an aggregate. This is not a C++
1460 `&', but really something which can have its address taken, and
1461 then act as a pointer to member, for example TYPE :: FIELD can have
1462 its address taken by saying & TYPE :: FIELD. ADDRESS_P is true if
1463 this expression is the operand of "&".
1465 @@ Prints out lousy diagnostics for operator <typename>
1468 @@ This function should be rewritten and placed in search.c. */
1471 build_offset_ref (tree type, tree member, bool address_p)
1474 tree basebinfo = NULL_TREE;
1476 /* class templates can come in as TEMPLATE_DECLs here. */
1477 if (TREE_CODE (member) == TEMPLATE_DECL)
1480 if (dependent_type_p (type) || type_dependent_expression_p (member))
1481 return build_qualified_name (NULL_TREE, type, member,
1482 /*template_p=*/false);
1484 gcc_assert (TYPE_P (type));
1485 if (! is_class_type (type, 1))
1486 return error_mark_node;
1488 gcc_assert (DECL_P (member) || BASELINK_P (member));
1489 /* Callers should call mark_used before this point. */
1490 gcc_assert (!DECL_P (member) || TREE_USED (member));
1492 if (!COMPLETE_TYPE_P (complete_type (type))
1493 && !TYPE_BEING_DEFINED (type))
1495 error ("incomplete type %qT does not have member %qD", type, member);
1496 return error_mark_node;
1499 /* Entities other than non-static members need no further
1501 if (TREE_CODE (member) == TYPE_DECL)
1503 if (TREE_CODE (member) == VAR_DECL || TREE_CODE (member) == CONST_DECL)
1504 return convert_from_reference (member);
1506 if (TREE_CODE (member) == FIELD_DECL && DECL_C_BIT_FIELD (member))
1508 error ("invalid pointer to bit-field %qD", member);
1509 return error_mark_node;
1512 /* Set up BASEBINFO for member lookup. */
1513 decl = maybe_dummy_object (type, &basebinfo);
1515 /* A lot of this logic is now handled in lookup_member. */
1516 if (BASELINK_P (member))
1518 /* Go from the TREE_BASELINK to the member function info. */
1519 tree t = BASELINK_FUNCTIONS (member);
1521 if (TREE_CODE (t) != TEMPLATE_ID_EXPR && !really_overloaded_fn (t))
1523 /* Get rid of a potential OVERLOAD around it. */
1524 t = OVL_CURRENT (t);
1526 /* Unique functions are handled easily. */
1528 /* For non-static member of base class, we need a special rule
1529 for access checking [class.protected]:
1531 If the access is to form a pointer to member, the
1532 nested-name-specifier shall name the derived class
1533 (or any class derived from that class). */
1534 if (address_p && DECL_P (t)
1535 && DECL_NONSTATIC_MEMBER_P (t))
1536 perform_or_defer_access_check (TYPE_BINFO (type), t, t);
1538 perform_or_defer_access_check (basebinfo, t, t);
1540 if (DECL_STATIC_FUNCTION_P (t))
1545 TREE_TYPE (member) = unknown_type_node;
1547 else if (address_p && TREE_CODE (member) == FIELD_DECL)
1548 /* We need additional test besides the one in
1549 check_accessibility_of_qualified_id in case it is
1550 a pointer to non-static member. */
1551 perform_or_defer_access_check (TYPE_BINFO (type), member, member);
1555 /* If MEMBER is non-static, then the program has fallen afoul of
1558 An id-expression that denotes a nonstatic data member or
1559 nonstatic member function of a class can only be used:
1561 -- as part of a class member access (_expr.ref_) in which the
1562 object-expression refers to the member's class or a class
1563 derived from that class, or
1565 -- to form a pointer to member (_expr.unary.op_), or
1567 -- in the body of a nonstatic member function of that class or
1568 of a class derived from that class (_class.mfct.nonstatic_), or
1570 -- in a mem-initializer for a constructor for that class or for
1571 a class derived from that class (_class.base.init_). */
1572 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (member))
1574 /* Build a representation of the qualified name suitable
1575 for use as the operand to "&" -- even though the "&" is
1576 not actually present. */
1577 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1578 /* In Microsoft mode, treat a non-static member function as if
1579 it were a pointer-to-member. */
1580 if (flag_ms_extensions)
1582 PTRMEM_OK_P (member) = 1;
1583 return cp_build_unary_op (ADDR_EXPR, member, 0,
1584 tf_warning_or_error);
1586 error ("invalid use of non-static member function %qD",
1587 TREE_OPERAND (member, 1));
1588 return error_mark_node;
1590 else if (TREE_CODE (member) == FIELD_DECL)
1592 error ("invalid use of non-static data member %qD", member);
1593 return error_mark_node;
1598 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1599 PTRMEM_OK_P (member) = 1;
1603 /* If DECL is a scalar enumeration constant or variable with a
1604 constant initializer, return the initializer (or, its initializers,
1605 recursively); otherwise, return DECL. If INTEGRAL_P, the
1606 initializer is only returned if DECL is an integral
1607 constant-expression. */
1610 constant_value_1 (tree decl, bool integral_p)
1612 while (TREE_CODE (decl) == CONST_DECL
1614 ? DECL_INTEGRAL_CONSTANT_VAR_P (decl)
1615 : (TREE_CODE (decl) == VAR_DECL
1616 && CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (decl)))))
1619 /* Static data members in template classes may have
1620 non-dependent initializers. References to such non-static
1621 data members are not value-dependent, so we must retrieve the
1622 initializer here. The DECL_INITIAL will have the right type,
1623 but will not have been folded because that would prevent us
1624 from performing all appropriate semantic checks at
1625 instantiation time. */
1626 if (DECL_CLASS_SCOPE_P (decl)
1627 && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (decl))
1628 && uses_template_parms (CLASSTYPE_TI_ARGS
1629 (DECL_CONTEXT (decl))))
1631 ++processing_template_decl;
1632 init = fold_non_dependent_expr (DECL_INITIAL (decl));
1633 --processing_template_decl;
1637 /* If DECL is a static data member in a template
1638 specialization, we must instantiate it here. The
1639 initializer for the static data member is not processed
1640 until needed; we need it now. */
1642 init = DECL_INITIAL (decl);
1644 if (init == error_mark_node)
1646 /* Initializers in templates are generally expanded during
1647 instantiation, so before that for const int i(2)
1648 INIT is a TREE_LIST with the actual initializer as
1650 if (processing_template_decl
1652 && TREE_CODE (init) == TREE_LIST
1653 && TREE_CHAIN (init) == NULL_TREE)
1654 init = TREE_VALUE (init);
1656 || !TREE_TYPE (init)
1658 ? !INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (init))
1659 : (!TREE_CONSTANT (init)
1660 /* Do not return an aggregate constant (of which
1661 string literals are a special case), as we do not
1662 want to make inadvertent copies of such entities,
1663 and we must be sure that their addresses are the
1665 || TREE_CODE (init) == CONSTRUCTOR
1666 || TREE_CODE (init) == STRING_CST)))
1668 decl = unshare_expr (init);
1673 /* If DECL is a CONST_DECL, or a constant VAR_DECL initialized by
1674 constant of integral or enumeration type, then return that value.
1675 These are those variables permitted in constant expressions by
1679 integral_constant_value (tree decl)
1681 return constant_value_1 (decl, /*integral_p=*/true);
1684 /* A more relaxed version of integral_constant_value, used by the
1685 common C/C++ code and by the C++ front end for optimization
1689 decl_constant_value (tree decl)
1691 return constant_value_1 (decl,
1692 /*integral_p=*/processing_template_decl);
1695 /* Common subroutines of build_new and build_vec_delete. */
1697 /* Call the global __builtin_delete to delete ADDR. */
1700 build_builtin_delete_call (tree addr)
1702 mark_used (global_delete_fndecl);
1703 return build_call_n (global_delete_fndecl, 1, addr);
1706 /* Build and return a NEW_EXPR. If NELTS is non-NULL, TYPE[NELTS] is
1707 the type of the object being allocated; otherwise, it's just TYPE.
1708 INIT is the initializer, if any. USE_GLOBAL_NEW is true if the
1709 user explicitly wrote "::operator new". PLACEMENT, if non-NULL, is
1710 the TREE_LIST of arguments to be provided as arguments to a
1711 placement new operator. This routine performs no semantic checks;
1712 it just creates and returns a NEW_EXPR. */
1715 build_raw_new_expr (tree placement, tree type, tree nelts, tree init,
1720 new_expr = build4 (NEW_EXPR, build_pointer_type (type), placement, type,
1722 NEW_EXPR_USE_GLOBAL (new_expr) = use_global_new;
1723 TREE_SIDE_EFFECTS (new_expr) = 1;
1728 /* Make sure that there are no aliasing issues with T, a placement new
1729 expression applied to PLACEMENT, by recording the change in dynamic
1730 type. If placement new is inlined, as it is with libstdc++, and if
1731 the type of the placement new differs from the type of the
1732 placement location itself, then alias analysis may think it is OK
1733 to interchange writes to the location from before the placement new
1734 and from after the placement new. We have to prevent type-based
1735 alias analysis from applying. PLACEMENT may be NULL, which means
1736 that we couldn't capture it in a temporary variable, in which case
1737 we use a memory clobber. */
1740 avoid_placement_new_aliasing (tree t, tree placement)
1744 if (processing_template_decl)
1747 /* If we are not using type based aliasing, we don't have to do
1749 if (!flag_strict_aliasing)
1752 /* If we have a pointer and a location, record the change in dynamic
1753 type. Otherwise we need a general memory clobber. */
1754 if (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE
1755 && placement != NULL_TREE
1756 && TREE_CODE (TREE_TYPE (placement)) == POINTER_TYPE)
1757 type_change = build_stmt (CHANGE_DYNAMIC_TYPE_EXPR,
1762 /* Build a memory clobber. */
1763 type_change = build_stmt (ASM_EXPR,
1764 build_string (0, ""),
1767 tree_cons (NULL_TREE,
1768 build_string (6, "memory"),
1771 ASM_VOLATILE_P (type_change) = 1;
1774 return build2 (COMPOUND_EXPR, TREE_TYPE (t), type_change, t);
1777 /* Generate code for a new-expression, including calling the "operator
1778 new" function, initializing the object, and, if an exception occurs
1779 during construction, cleaning up. The arguments are as for
1780 build_raw_new_expr. */
1783 build_new_1 (tree placement, tree type, tree nelts, tree init,
1784 bool globally_qualified_p, tsubst_flags_t complain)
1787 /* True iff this is a call to "operator new[]" instead of just
1789 bool array_p = false;
1790 /* If ARRAY_P is true, the element type of the array. This is never
1791 an ARRAY_TYPE; for something like "new int[3][4]", the
1792 ELT_TYPE is "int". If ARRAY_P is false, this is the same type as
1795 /* The type of the new-expression. (This type is always a pointer
1798 tree outer_nelts = NULL_TREE;
1799 tree alloc_call, alloc_expr;
1800 /* The address returned by the call to "operator new". This node is
1801 a VAR_DECL and is therefore reusable. */
1804 tree cookie_expr, init_expr;
1805 int nothrow, check_new;
1806 int use_java_new = 0;
1807 /* If non-NULL, the number of extra bytes to allocate at the
1808 beginning of the storage allocated for an array-new expression in
1809 order to store the number of elements. */
1810 tree cookie_size = NULL_TREE;
1811 tree placement_expr = NULL_TREE;
1812 /* True if the function we are calling is a placement allocation
1814 bool placement_allocation_fn_p;
1815 tree args = NULL_TREE;
1816 /* True if the storage must be initialized, either by a constructor
1817 or due to an explicit new-initializer. */
1818 bool is_initialized;
1819 /* The address of the thing allocated, not including any cookie. In
1820 particular, if an array cookie is in use, DATA_ADDR is the
1821 address of the first array element. This node is a VAR_DECL, and
1822 is therefore reusable. */
1824 tree init_preeval_expr = NULL_TREE;
1828 outer_nelts = nelts;
1831 else if (TREE_CODE (type) == ARRAY_TYPE)
1834 nelts = array_type_nelts_top (type);
1835 outer_nelts = nelts;
1836 type = TREE_TYPE (type);
1839 /* If our base type is an array, then make sure we know how many elements
1841 for (elt_type = type;
1842 TREE_CODE (elt_type) == ARRAY_TYPE;
1843 elt_type = TREE_TYPE (elt_type))
1844 nelts = cp_build_binary_op (input_location,
1846 array_type_nelts_top (elt_type),
1849 if (TREE_CODE (elt_type) == VOID_TYPE)
1851 if (complain & tf_error)
1852 error ("invalid type %<void%> for new");
1853 return error_mark_node;
1856 if (abstract_virtuals_error (NULL_TREE, elt_type))
1857 return error_mark_node;
1859 is_initialized = (TYPE_NEEDS_CONSTRUCTING (elt_type) || init);
1861 if (CP_TYPE_CONST_P (elt_type) && !init
1862 && !type_has_user_provided_default_constructor (elt_type))
1864 if (complain & tf_error)
1865 error ("uninitialized const in %<new%> of %q#T", elt_type);
1866 return error_mark_node;
1869 size = size_in_bytes (elt_type);
1871 size = size_binop (MULT_EXPR, size, convert (sizetype, nelts));
1873 alloc_fn = NULL_TREE;
1875 /* Allocate the object. */
1876 if (! placement && TYPE_FOR_JAVA (elt_type))
1879 tree class_decl = build_java_class_ref (elt_type);
1880 static const char alloc_name[] = "_Jv_AllocObject";
1882 if (class_decl == error_mark_node)
1883 return error_mark_node;
1886 if (!get_global_value_if_present (get_identifier (alloc_name),
1889 if (complain & tf_error)
1890 error ("call to Java constructor with %qs undefined", alloc_name);
1891 return error_mark_node;
1893 else if (really_overloaded_fn (alloc_fn))
1895 if (complain & tf_error)
1896 error ("%qD should never be overloaded", alloc_fn);
1897 return error_mark_node;
1899 alloc_fn = OVL_CURRENT (alloc_fn);
1900 class_addr = build1 (ADDR_EXPR, jclass_node, class_decl);
1901 alloc_call = (cp_build_function_call
1903 build_tree_list (NULL_TREE, class_addr),
1906 else if (TYPE_FOR_JAVA (elt_type) && MAYBE_CLASS_TYPE_P (elt_type))
1908 error ("Java class %q#T object allocated using placement new", elt_type);
1909 return error_mark_node;
1916 fnname = ansi_opname (array_p ? VEC_NEW_EXPR : NEW_EXPR);
1918 if (!globally_qualified_p
1919 && CLASS_TYPE_P (elt_type)
1921 ? TYPE_HAS_ARRAY_NEW_OPERATOR (elt_type)
1922 : TYPE_HAS_NEW_OPERATOR (elt_type)))
1924 /* Use a class-specific operator new. */
1925 /* If a cookie is required, add some extra space. */
1926 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1928 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1929 size = size_binop (PLUS_EXPR, size, cookie_size);
1931 /* Create the argument list. */
1932 args = tree_cons (NULL_TREE, size, placement);
1933 /* Do name-lookup to find the appropriate operator. */
1934 fns = lookup_fnfields (elt_type, fnname, /*protect=*/2);
1935 if (fns == NULL_TREE)
1937 if (complain & tf_error)
1938 error ("no suitable %qD found in class %qT", fnname, elt_type);
1939 return error_mark_node;
1941 if (TREE_CODE (fns) == TREE_LIST)
1943 if (complain & tf_error)
1945 error ("request for member %qD is ambiguous", fnname);
1946 print_candidates (fns);
1948 return error_mark_node;
1950 alloc_call = build_new_method_call (build_dummy_object (elt_type),
1952 /*conversion_path=*/NULL_TREE,
1959 /* Use a global operator new. */
1960 /* See if a cookie might be required. */
1961 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1962 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1964 cookie_size = NULL_TREE;
1966 alloc_call = build_operator_new_call (fnname, placement,
1967 &size, &cookie_size,
1972 if (alloc_call == error_mark_node)
1973 return error_mark_node;
1975 gcc_assert (alloc_fn != NULL_TREE);
1977 /* If PLACEMENT is a simple pointer type and is not passed by reference,
1978 then copy it into PLACEMENT_EXPR. */
1979 if (!processing_template_decl
1980 && placement != NULL_TREE
1981 && TREE_CHAIN (placement) == NULL_TREE
1982 && TREE_CODE (TREE_TYPE (TREE_VALUE (placement))) == POINTER_TYPE
1983 && TREE_CODE (alloc_call) == CALL_EXPR
1984 && call_expr_nargs (alloc_call) == 2
1985 && TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (alloc_call, 0))) == INTEGER_TYPE
1986 && TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (alloc_call, 1))) == POINTER_TYPE)
1988 tree placement_arg = CALL_EXPR_ARG (alloc_call, 1);
1990 if (INTEGRAL_TYPE_P (TREE_TYPE (TREE_TYPE (placement_arg)))
1991 || VOID_TYPE_P (TREE_TYPE (TREE_TYPE (placement_arg))))
1993 placement_expr = get_target_expr (TREE_VALUE (placement));
1994 CALL_EXPR_ARG (alloc_call, 1)
1995 = convert (TREE_TYPE (placement_arg), placement_expr);
1999 /* In the simple case, we can stop now. */
2000 pointer_type = build_pointer_type (type);
2001 if (!cookie_size && !is_initialized)
2003 rval = build_nop (pointer_type, alloc_call);
2004 if (placement != NULL)
2005 rval = avoid_placement_new_aliasing (rval, placement_expr);
2009 /* Store the result of the allocation call in a variable so that we can
2010 use it more than once. */
2011 alloc_expr = get_target_expr (alloc_call);
2012 alloc_node = TARGET_EXPR_SLOT (alloc_expr);
2014 /* Strip any COMPOUND_EXPRs from ALLOC_CALL. */
2015 while (TREE_CODE (alloc_call) == COMPOUND_EXPR)
2016 alloc_call = TREE_OPERAND (alloc_call, 1);
2018 /* Now, check to see if this function is actually a placement
2019 allocation function. This can happen even when PLACEMENT is NULL
2020 because we might have something like:
2022 struct S { void* operator new (size_t, int i = 0); };
2024 A call to `new S' will get this allocation function, even though
2025 there is no explicit placement argument. If there is more than
2026 one argument, or there are variable arguments, then this is a
2027 placement allocation function. */
2028 placement_allocation_fn_p
2029 = (type_num_arguments (TREE_TYPE (alloc_fn)) > 1
2030 || varargs_function_p (alloc_fn));
2032 /* Preevaluate the placement args so that we don't reevaluate them for a
2033 placement delete. */
2034 if (placement_allocation_fn_p)
2037 stabilize_call (alloc_call, &inits);
2039 alloc_expr = build2 (COMPOUND_EXPR, TREE_TYPE (alloc_expr), inits,
2043 /* unless an allocation function is declared with an empty excep-
2044 tion-specification (_except.spec_), throw(), it indicates failure to
2045 allocate storage by throwing a bad_alloc exception (clause _except_,
2046 _lib.bad.alloc_); it returns a non-null pointer otherwise If the allo-
2047 cation function is declared with an empty exception-specification,
2048 throw(), it returns null to indicate failure to allocate storage and a
2049 non-null pointer otherwise.
2051 So check for a null exception spec on the op new we just called. */
2053 nothrow = TYPE_NOTHROW_P (TREE_TYPE (alloc_fn));
2054 check_new = (flag_check_new || nothrow) && ! use_java_new;
2062 /* Adjust so we're pointing to the start of the object. */
2063 data_addr = build2 (POINTER_PLUS_EXPR, TREE_TYPE (alloc_node),
2064 alloc_node, cookie_size);
2066 /* Store the number of bytes allocated so that we can know how
2067 many elements to destroy later. We use the last sizeof
2068 (size_t) bytes to store the number of elements. */
2069 cookie_ptr = size_binop (MINUS_EXPR, cookie_size, size_in_bytes (sizetype));
2070 cookie_ptr = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (alloc_node),
2071 alloc_node, cookie_ptr);
2072 size_ptr_type = build_pointer_type (sizetype);
2073 cookie_ptr = fold_convert (size_ptr_type, cookie_ptr);
2074 cookie = cp_build_indirect_ref (cookie_ptr, NULL, complain);
2076 cookie_expr = build2 (MODIFY_EXPR, sizetype, cookie, nelts);
2078 if (targetm.cxx.cookie_has_size ())
2080 /* Also store the element size. */
2081 cookie_ptr = build2 (POINTER_PLUS_EXPR, size_ptr_type, cookie_ptr,
2082 fold_build1 (NEGATE_EXPR, sizetype,
2083 size_in_bytes (sizetype)));
2085 cookie = cp_build_indirect_ref (cookie_ptr, NULL, complain);
2086 cookie = build2 (MODIFY_EXPR, sizetype, cookie,
2087 size_in_bytes (elt_type));
2088 cookie_expr = build2 (COMPOUND_EXPR, TREE_TYPE (cookie_expr),
2089 cookie, cookie_expr);
2094 cookie_expr = NULL_TREE;
2095 data_addr = alloc_node;
2098 /* Now use a pointer to the type we've actually allocated. */
2099 data_addr = fold_convert (pointer_type, data_addr);
2100 /* Any further uses of alloc_node will want this type, too. */
2101 alloc_node = fold_convert (pointer_type, alloc_node);
2103 /* Now initialize the allocated object. Note that we preevaluate the
2104 initialization expression, apart from the actual constructor call or
2105 assignment--we do this because we want to delay the allocation as long
2106 as possible in order to minimize the size of the exception region for
2107 placement delete. */
2111 bool explicit_value_init_p = false;
2113 if (init == void_zero_node)
2116 explicit_value_init_p = true;
2121 tree non_const_pointer_type = build_pointer_type
2122 (cp_build_qualified_type (type, TYPE_QUALS (type) & ~TYPE_QUAL_CONST));
2124 if (init && TREE_CHAIN (init) == NULL_TREE
2125 && BRACE_ENCLOSED_INITIALIZER_P (TREE_VALUE (init))
2126 && CONSTRUCTOR_IS_DIRECT_INIT (TREE_VALUE (init)))
2128 tree arraytype, domain;
2129 init = TREE_VALUE (init);
2130 if (TREE_CONSTANT (nelts))
2131 domain = compute_array_index_type (NULL_TREE, nelts);
2135 if (CONSTRUCTOR_NELTS (init) > 0)
2136 warning (0, "non-constant array size in new, unable to "
2137 "verify length of initializer-list");
2139 arraytype = build_cplus_array_type (type, domain);
2140 init = digest_init (arraytype, init);
2144 if (complain & tf_error)
2145 permerror (input_location, "ISO C++ forbids initialization in array new");
2147 return error_mark_node;
2150 = build_vec_init (fold_convert (non_const_pointer_type, data_addr),
2151 cp_build_binary_op (input_location,
2152 MINUS_EXPR, outer_nelts,
2156 explicit_value_init_p,
2160 /* An array initialization is stable because the initialization
2161 of each element is a full-expression, so the temporaries don't
2167 init_expr = cp_build_indirect_ref (data_addr, NULL, complain);
2169 if (TYPE_NEEDS_CONSTRUCTING (type)
2170 && (!explicit_value_init_p || processing_template_decl))
2172 init_expr = build_special_member_call (init_expr,
2173 complete_ctor_identifier,
2178 else if (explicit_value_init_p)
2180 if (processing_template_decl)
2181 /* Don't worry about it, we'll handle this properly at
2182 instantiation time. */;
2184 /* Something like `new int()'. */
2185 init_expr = build2 (INIT_EXPR, type,
2186 init_expr, build_value_init (type));
2190 /* We are processing something like `new int (10)', which
2191 means allocate an int, and initialize it with 10. */
2193 if (TREE_CODE (init) == TREE_LIST)
2194 init = build_x_compound_expr_from_list (init,
2197 gcc_assert (TREE_CODE (init) != CONSTRUCTOR
2198 || TREE_TYPE (init) != NULL_TREE);
2200 init_expr = cp_build_modify_expr (init_expr, INIT_EXPR, init,
2203 stable = stabilize_init (init_expr, &init_preeval_expr);
2206 if (init_expr == error_mark_node)
2207 return error_mark_node;
2209 /* If any part of the object initialization terminates by throwing an
2210 exception and a suitable deallocation function can be found, the
2211 deallocation function is called to free the memory in which the
2212 object was being constructed, after which the exception continues
2213 to propagate in the context of the new-expression. If no
2214 unambiguous matching deallocation function can be found,
2215 propagating the exception does not cause the object's memory to be
2217 if (flag_exceptions && ! use_java_new)
2219 enum tree_code dcode = array_p ? VEC_DELETE_EXPR : DELETE_EXPR;
2222 /* The Standard is unclear here, but the right thing to do
2223 is to use the same method for finding deallocation
2224 functions that we use for finding allocation functions. */
2225 cleanup = (build_op_delete_call
2229 globally_qualified_p,
2230 placement_allocation_fn_p ? alloc_call : NULL_TREE,
2236 /* This is much simpler if we were able to preevaluate all of
2237 the arguments to the constructor call. */
2238 init_expr = build2 (TRY_CATCH_EXPR, void_type_node,
2239 init_expr, cleanup);
2241 /* Ack! First we allocate the memory. Then we set our sentry
2242 variable to true, and expand a cleanup that deletes the
2243 memory if sentry is true. Then we run the constructor, and
2244 finally clear the sentry.
2246 We need to do this because we allocate the space first, so
2247 if there are any temporaries with cleanups in the
2248 constructor args and we weren't able to preevaluate them, we
2249 need this EH region to extend until end of full-expression
2250 to preserve nesting. */
2252 tree end, sentry, begin;
2254 begin = get_target_expr (boolean_true_node);
2255 CLEANUP_EH_ONLY (begin) = 1;
2257 sentry = TARGET_EXPR_SLOT (begin);
2259 TARGET_EXPR_CLEANUP (begin)
2260 = build3 (COND_EXPR, void_type_node, sentry,
2261 cleanup, void_zero_node);
2263 end = build2 (MODIFY_EXPR, TREE_TYPE (sentry),
2264 sentry, boolean_false_node);
2267 = build2 (COMPOUND_EXPR, void_type_node, begin,
2268 build2 (COMPOUND_EXPR, void_type_node, init_expr,
2275 init_expr = NULL_TREE;
2277 /* Now build up the return value in reverse order. */
2282 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_expr, rval);
2284 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), cookie_expr, rval);
2286 if (rval == data_addr)
2287 /* If we don't have an initializer or a cookie, strip the TARGET_EXPR
2288 and return the call (which doesn't need to be adjusted). */
2289 rval = TARGET_EXPR_INITIAL (alloc_expr);
2294 tree ifexp = cp_build_binary_op (input_location,
2295 NE_EXPR, alloc_node,
2298 rval = build_conditional_expr (ifexp, rval, alloc_node,
2302 /* Perform the allocation before anything else, so that ALLOC_NODE
2303 has been initialized before we start using it. */
2304 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), alloc_expr, rval);
2307 if (init_preeval_expr)
2308 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_preeval_expr, rval);
2310 /* A new-expression is never an lvalue. */
2311 gcc_assert (!lvalue_p (rval));
2313 if (placement != NULL)
2314 rval = avoid_placement_new_aliasing (rval, placement_expr);
2319 /* Generate a representation for a C++ "new" expression. PLACEMENT is
2320 a TREE_LIST of placement-new arguments (or NULL_TREE if none). If
2321 NELTS is NULL, TYPE is the type of the storage to be allocated. If
2322 NELTS is not NULL, then this is an array-new allocation; TYPE is
2323 the type of the elements in the array and NELTS is the number of
2324 elements in the array. INIT, if non-NULL, is the initializer for
2325 the new object, or void_zero_node to indicate an initializer of
2326 "()". If USE_GLOBAL_NEW is true, then the user explicitly wrote
2327 "::new" rather than just "new". */
2330 build_new (tree placement, tree type, tree nelts, tree init,
2331 int use_global_new, tsubst_flags_t complain)
2334 tree orig_placement;
2338 if (placement == error_mark_node || type == error_mark_node
2339 || init == error_mark_node)
2340 return error_mark_node;
2342 orig_placement = placement;
2346 if (nelts == NULL_TREE && init != void_zero_node && list_length (init) == 1)
2348 tree auto_node = type_uses_auto (type);
2349 if (auto_node && describable_type (TREE_VALUE (init)))
2350 type = do_auto_deduction (type, TREE_VALUE (init), auto_node);
2353 if (processing_template_decl)
2355 if (dependent_type_p (type)
2356 || any_type_dependent_arguments_p (placement)
2357 || (nelts && type_dependent_expression_p (nelts))
2358 || (init != void_zero_node
2359 && any_type_dependent_arguments_p (init)))
2360 return build_raw_new_expr (placement, type, nelts, init,
2362 placement = build_non_dependent_args (placement);
2364 nelts = build_non_dependent_expr (nelts);
2365 if (init != void_zero_node)
2366 init = build_non_dependent_args (init);
2371 if (!build_expr_type_conversion (WANT_INT | WANT_ENUM, nelts, false))
2373 if (complain & tf_error)
2374 permerror (input_location, "size in array new must have integral type");
2376 return error_mark_node;
2378 nelts = cp_save_expr (cp_convert (sizetype, nelts));
2381 /* ``A reference cannot be created by the new operator. A reference
2382 is not an object (8.2.2, 8.4.3), so a pointer to it could not be
2383 returned by new.'' ARM 5.3.3 */
2384 if (TREE_CODE (type) == REFERENCE_TYPE)
2386 if (complain & tf_error)
2387 error ("new cannot be applied to a reference type");
2389 return error_mark_node;
2390 type = TREE_TYPE (type);
2393 if (TREE_CODE (type) == FUNCTION_TYPE)
2395 if (complain & tf_error)
2396 error ("new cannot be applied to a function type");
2397 return error_mark_node;
2400 /* The type allocated must be complete. If the new-type-id was
2401 "T[N]" then we are just checking that "T" is complete here, but
2402 that is equivalent, since the value of "N" doesn't matter. */
2403 if (!complete_type_or_else (type, NULL_TREE))
2404 return error_mark_node;
2406 rval = build_new_1 (placement, type, nelts, init, use_global_new, complain);
2407 if (rval == error_mark_node)
2408 return error_mark_node;
2410 if (processing_template_decl)
2411 return build_raw_new_expr (orig_placement, type, orig_nelts, orig_init,
2414 /* Wrap it in a NOP_EXPR so warn_if_unused_value doesn't complain. */
2415 rval = build1 (NOP_EXPR, TREE_TYPE (rval), rval);
2416 TREE_NO_WARNING (rval) = 1;
2421 /* Given a Java class, return a decl for the corresponding java.lang.Class. */
2424 build_java_class_ref (tree type)
2426 tree name = NULL_TREE, class_decl;
2427 static tree CL_suffix = NULL_TREE;
2428 if (CL_suffix == NULL_TREE)
2429 CL_suffix = get_identifier("class$");
2430 if (jclass_node == NULL_TREE)
2432 jclass_node = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
2433 if (jclass_node == NULL_TREE)
2435 error ("call to Java constructor, while %<jclass%> undefined");
2436 return error_mark_node;
2438 jclass_node = TREE_TYPE (jclass_node);
2441 /* Mangle the class$ field. */
2444 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
2445 if (DECL_NAME (field) == CL_suffix)
2447 mangle_decl (field);
2448 name = DECL_ASSEMBLER_NAME (field);
2453 error ("can't find %<class$%> in %qT", type);
2454 return error_mark_node;
2458 class_decl = IDENTIFIER_GLOBAL_VALUE (name);
2459 if (class_decl == NULL_TREE)
2461 class_decl = build_decl (VAR_DECL, name, TREE_TYPE (jclass_node));
2462 TREE_STATIC (class_decl) = 1;
2463 DECL_EXTERNAL (class_decl) = 1;
2464 TREE_PUBLIC (class_decl) = 1;
2465 DECL_ARTIFICIAL (class_decl) = 1;
2466 DECL_IGNORED_P (class_decl) = 1;
2467 pushdecl_top_level (class_decl);
2468 make_decl_rtl (class_decl);
2474 build_vec_delete_1 (tree base, tree maxindex, tree type,
2475 special_function_kind auto_delete_vec, int use_global_delete)
2478 tree ptype = build_pointer_type (type = complete_type (type));
2479 tree size_exp = size_in_bytes (type);
2481 /* Temporary variables used by the loop. */
2482 tree tbase, tbase_init;
2484 /* This is the body of the loop that implements the deletion of a
2485 single element, and moves temp variables to next elements. */
2488 /* This is the LOOP_EXPR that governs the deletion of the elements. */
2491 /* This is the thing that governs what to do after the loop has run. */
2492 tree deallocate_expr = 0;
2494 /* This is the BIND_EXPR which holds the outermost iterator of the
2495 loop. It is convenient to set this variable up and test it before
2496 executing any other code in the loop.
2497 This is also the containing expression returned by this function. */
2498 tree controller = NULL_TREE;
2501 /* We should only have 1-D arrays here. */
2502 gcc_assert (TREE_CODE (type) != ARRAY_TYPE);
2504 if (! MAYBE_CLASS_TYPE_P (type) || TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
2507 /* The below is short by the cookie size. */
2508 virtual_size = size_binop (MULT_EXPR, size_exp,
2509 convert (sizetype, maxindex));
2511 tbase = create_temporary_var (ptype);
2512 tbase_init = cp_build_modify_expr (tbase, NOP_EXPR,
2513 fold_build2 (POINTER_PLUS_EXPR, ptype,
2514 fold_convert (ptype, base),
2516 tf_warning_or_error);
2517 DECL_REGISTER (tbase) = 1;
2518 controller = build3 (BIND_EXPR, void_type_node, tbase,
2519 NULL_TREE, NULL_TREE);
2520 TREE_SIDE_EFFECTS (controller) = 1;
2522 body = build1 (EXIT_EXPR, void_type_node,
2523 build2 (EQ_EXPR, boolean_type_node, tbase,
2524 fold_convert (ptype, base)));
2525 tmp = fold_build1 (NEGATE_EXPR, sizetype, size_exp);
2526 body = build_compound_expr
2527 (body, cp_build_modify_expr (tbase, NOP_EXPR,
2528 build2 (POINTER_PLUS_EXPR, ptype, tbase, tmp),
2529 tf_warning_or_error));
2530 body = build_compound_expr
2531 (body, build_delete (ptype, tbase, sfk_complete_destructor,
2532 LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 1));
2534 loop = build1 (LOOP_EXPR, void_type_node, body);
2535 loop = build_compound_expr (tbase_init, loop);
2538 /* If the delete flag is one, or anything else with the low bit set,
2539 delete the storage. */
2540 if (auto_delete_vec != sfk_base_destructor)
2544 /* The below is short by the cookie size. */
2545 virtual_size = size_binop (MULT_EXPR, size_exp,
2546 convert (sizetype, maxindex));
2548 if (! TYPE_VEC_NEW_USES_COOKIE (type))
2555 cookie_size = targetm.cxx.get_cookie_size (type);
2557 = cp_convert (ptype,
2558 cp_build_binary_op (input_location,
2560 cp_convert (string_type_node,
2563 tf_warning_or_error));
2564 /* True size with header. */
2565 virtual_size = size_binop (PLUS_EXPR, virtual_size, cookie_size);
2568 if (auto_delete_vec == sfk_deleting_destructor)
2569 deallocate_expr = build_op_delete_call (VEC_DELETE_EXPR,
2570 base_tbd, virtual_size,
2571 use_global_delete & 1,
2572 /*placement=*/NULL_TREE,
2573 /*alloc_fn=*/NULL_TREE);
2577 if (!deallocate_expr)
2580 body = deallocate_expr;
2582 body = build_compound_expr (body, deallocate_expr);
2585 body = integer_zero_node;
2587 /* Outermost wrapper: If pointer is null, punt. */
2588 body = fold_build3 (COND_EXPR, void_type_node,
2589 fold_build2 (NE_EXPR, boolean_type_node, base,
2590 convert (TREE_TYPE (base),
2591 integer_zero_node)),
2592 body, integer_zero_node);
2593 body = build1 (NOP_EXPR, void_type_node, body);
2597 TREE_OPERAND (controller, 1) = body;
2601 if (TREE_CODE (base) == SAVE_EXPR)
2602 /* Pre-evaluate the SAVE_EXPR outside of the BIND_EXPR. */
2603 body = build2 (COMPOUND_EXPR, void_type_node, base, body);
2605 return convert_to_void (body, /*implicit=*/NULL, tf_warning_or_error);
2608 /* Create an unnamed variable of the indicated TYPE. */
2611 create_temporary_var (tree type)
2615 decl = build_decl (VAR_DECL, NULL_TREE, type);
2616 TREE_USED (decl) = 1;
2617 DECL_ARTIFICIAL (decl) = 1;
2618 DECL_IGNORED_P (decl) = 1;
2619 DECL_SOURCE_LOCATION (decl) = input_location;
2620 DECL_CONTEXT (decl) = current_function_decl;
2625 /* Create a new temporary variable of the indicated TYPE, initialized
2628 It is not entered into current_binding_level, because that breaks
2629 things when it comes time to do final cleanups (which take place
2630 "outside" the binding contour of the function). */
2633 get_temp_regvar (tree type, tree init)
2637 decl = create_temporary_var (type);
2638 add_decl_expr (decl);
2640 finish_expr_stmt (cp_build_modify_expr (decl, INIT_EXPR, init,
2641 tf_warning_or_error));
2646 /* `build_vec_init' returns tree structure that performs
2647 initialization of a vector of aggregate types.
2649 BASE is a reference to the vector, of ARRAY_TYPE, or a pointer
2650 to the first element, of POINTER_TYPE.
2651 MAXINDEX is the maximum index of the array (one less than the
2652 number of elements). It is only used if BASE is a pointer or
2653 TYPE_DOMAIN (TREE_TYPE (BASE)) == NULL_TREE.
2655 INIT is the (possibly NULL) initializer.
2657 If EXPLICIT_VALUE_INIT_P is true, then INIT must be NULL. All
2658 elements in the array are value-initialized.
2660 FROM_ARRAY is 0 if we should init everything with INIT
2661 (i.e., every element initialized from INIT).
2662 FROM_ARRAY is 1 if we should index into INIT in parallel
2663 with initialization of DECL.
2664 FROM_ARRAY is 2 if we should index into INIT in parallel,
2665 but use assignment instead of initialization. */
2668 build_vec_init (tree base, tree maxindex, tree init,
2669 bool explicit_value_init_p,
2670 int from_array, tsubst_flags_t complain)
2673 tree base2 = NULL_TREE;
2675 tree itype = NULL_TREE;
2677 /* The type of BASE. */
2678 tree atype = TREE_TYPE (base);
2679 /* The type of an element in the array. */
2680 tree type = TREE_TYPE (atype);
2681 /* The element type reached after removing all outer array
2683 tree inner_elt_type;
2684 /* The type of a pointer to an element in the array. */
2689 tree try_block = NULL_TREE;
2690 int num_initialized_elts = 0;
2693 if (TREE_CODE (atype) == ARRAY_TYPE && TYPE_DOMAIN (atype))
2694 maxindex = array_type_nelts (atype);
2696 if (maxindex == NULL_TREE || maxindex == error_mark_node)
2697 return error_mark_node;
2699 if (explicit_value_init_p)
2702 inner_elt_type = strip_array_types (type);
2704 /* Look through the TARGET_EXPR around a compound literal. */
2705 if (init && TREE_CODE (init) == TARGET_EXPR
2706 && TREE_CODE (TARGET_EXPR_INITIAL (init)) == CONSTRUCTOR
2708 init = TARGET_EXPR_INITIAL (init);
2711 && TREE_CODE (atype) == ARRAY_TYPE
2713 ? (!CLASS_TYPE_P (inner_elt_type)
2714 || !TYPE_HAS_COMPLEX_ASSIGN_REF (inner_elt_type))
2715 : !TYPE_NEEDS_CONSTRUCTING (type))
2716 && ((TREE_CODE (init) == CONSTRUCTOR
2717 /* Don't do this if the CONSTRUCTOR might contain something
2718 that might throw and require us to clean up. */
2719 && (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init))
2720 || ! TYPE_HAS_NONTRIVIAL_DESTRUCTOR (inner_elt_type)))
2723 /* Do non-default initialization of POD arrays resulting from
2724 brace-enclosed initializers. In this case, digest_init and
2725 store_constructor will handle the semantics for us. */
2727 stmt_expr = build2 (INIT_EXPR, atype, base, init);
2731 maxindex = cp_convert (ptrdiff_type_node, maxindex);
2732 size = size_in_bytes (type);
2733 if (TREE_CODE (atype) == ARRAY_TYPE)
2735 ptype = build_pointer_type (type);
2736 base = cp_convert (ptype, decay_conversion (base));
2741 /* The code we are generating looks like:
2745 ptrdiff_t iterator = maxindex;
2747 for (; iterator != -1; --iterator) {
2748 ... initialize *t1 ...
2752 ... destroy elements that were constructed ...
2757 We can omit the try and catch blocks if we know that the
2758 initialization will never throw an exception, or if the array
2759 elements do not have destructors. We can omit the loop completely if
2760 the elements of the array do not have constructors.
2762 We actually wrap the entire body of the above in a STMT_EXPR, for
2765 When copying from array to another, when the array elements have
2766 only trivial copy constructors, we should use __builtin_memcpy
2767 rather than generating a loop. That way, we could take advantage
2768 of whatever cleverness the back end has for dealing with copies
2769 of blocks of memory. */
2771 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
2772 destroy_temps = stmts_are_full_exprs_p ();
2773 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2774 rval = get_temp_regvar (ptype, base);
2775 base = get_temp_regvar (ptype, rval);
2776 iterator = get_temp_regvar (ptrdiff_type_node, maxindex);
2778 /* If initializing one array from another, initialize element by
2779 element. We rely upon the below calls to do the argument
2780 checking. Evaluate the initializer before entering the try block. */
2781 if (from_array && init && TREE_CODE (init) != CONSTRUCTOR)
2783 base2 = decay_conversion (init);
2784 itype = TREE_TYPE (base2);
2785 base2 = get_temp_regvar (itype, base2);
2786 itype = TREE_TYPE (itype);
2789 /* Protect the entire array initialization so that we can destroy
2790 the partially constructed array if an exception is thrown.
2791 But don't do this if we're assigning. */
2792 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2795 try_block = begin_try_block ();
2798 if (init != NULL_TREE && TREE_CODE (init) == CONSTRUCTOR)
2800 /* Do non-default initialization of non-POD arrays resulting from
2801 brace-enclosed initializers. */
2802 unsigned HOST_WIDE_INT idx;
2806 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init), idx, elt)
2808 tree baseref = build1 (INDIRECT_REF, type, base);
2810 num_initialized_elts++;
2812 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2813 if (MAYBE_CLASS_TYPE_P (type) || TREE_CODE (type) == ARRAY_TYPE)
2814 finish_expr_stmt (build_aggr_init (baseref, elt, 0, complain));
2816 finish_expr_stmt (cp_build_modify_expr (baseref, NOP_EXPR,
2818 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2820 finish_expr_stmt (cp_build_unary_op (PREINCREMENT_EXPR, base, 0,
2822 finish_expr_stmt (cp_build_unary_op (PREDECREMENT_EXPR, iterator, 0,
2826 /* Clear out INIT so that we don't get confused below. */
2829 else if (from_array)
2832 /* OK, we set base2 above. */;
2833 else if (TYPE_LANG_SPECIFIC (type)
2834 && TYPE_NEEDS_CONSTRUCTING (type)
2835 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
2837 if (complain & tf_error)
2838 error ("initializer ends prematurely");
2839 return error_mark_node;
2843 /* Now, default-initialize any remaining elements. We don't need to
2844 do that if a) the type does not need constructing, or b) we've
2845 already initialized all the elements.
2847 We do need to keep going if we're copying an array. */
2850 || ((TYPE_NEEDS_CONSTRUCTING (type) || explicit_value_init_p)
2851 && ! (host_integerp (maxindex, 0)
2852 && (num_initialized_elts
2853 == tree_low_cst (maxindex, 0) + 1))))
2855 /* If the ITERATOR is equal to -1, then we don't have to loop;
2856 we've already initialized all the elements. */
2861 for_stmt = begin_for_stmt ();
2862 finish_for_init_stmt (for_stmt);
2863 finish_for_cond (build2 (NE_EXPR, boolean_type_node, iterator,
2864 build_int_cst (TREE_TYPE (iterator), -1)),
2866 finish_for_expr (cp_build_unary_op (PREDECREMENT_EXPR, iterator, 0,
2870 to = build1 (INDIRECT_REF, type, base);
2877 from = build1 (INDIRECT_REF, itype, base2);
2881 if (from_array == 2)
2882 elt_init = cp_build_modify_expr (to, NOP_EXPR, from,
2884 else if (TYPE_NEEDS_CONSTRUCTING (type))
2885 elt_init = build_aggr_init (to, from, 0, complain);
2887 elt_init = cp_build_modify_expr (to, NOP_EXPR, from,
2892 else if (TREE_CODE (type) == ARRAY_TYPE)
2896 ("cannot initialize multi-dimensional array with initializer");
2897 elt_init = build_vec_init (build1 (INDIRECT_REF, type, base),
2899 explicit_value_init_p,
2902 else if (explicit_value_init_p)
2903 elt_init = build2 (INIT_EXPR, type, to,
2904 build_value_init (type));
2907 gcc_assert (TYPE_NEEDS_CONSTRUCTING (type));
2908 elt_init = build_aggr_init (to, init, 0, complain);
2911 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2912 finish_expr_stmt (elt_init);
2913 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2915 finish_expr_stmt (cp_build_unary_op (PREINCREMENT_EXPR, base, 0,
2918 finish_expr_stmt (cp_build_unary_op (PREINCREMENT_EXPR, base2, 0,
2921 finish_for_stmt (for_stmt);
2924 /* Make sure to cleanup any partially constructed elements. */
2925 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2929 tree m = cp_build_binary_op (input_location,
2930 MINUS_EXPR, maxindex, iterator,
2933 /* Flatten multi-dimensional array since build_vec_delete only
2934 expects one-dimensional array. */
2935 if (TREE_CODE (type) == ARRAY_TYPE)
2936 m = cp_build_binary_op (input_location,
2938 array_type_nelts_total (type),
2941 finish_cleanup_try_block (try_block);
2942 e = build_vec_delete_1 (rval, m,
2943 inner_elt_type, sfk_base_destructor,
2944 /*use_global_delete=*/0);
2945 finish_cleanup (e, try_block);
2948 /* The value of the array initialization is the array itself, RVAL
2949 is a pointer to the first element. */
2950 finish_stmt_expr_expr (rval, stmt_expr);
2952 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
2954 /* Now make the result have the correct type. */
2955 if (TREE_CODE (atype) == ARRAY_TYPE)
2957 atype = build_pointer_type (atype);
2958 stmt_expr = build1 (NOP_EXPR, atype, stmt_expr);
2959 stmt_expr = cp_build_indirect_ref (stmt_expr, NULL, complain);
2962 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
2966 /* Call the DTOR_KIND destructor for EXP. FLAGS are as for
2970 build_dtor_call (tree exp, special_function_kind dtor_kind, int flags)
2976 case sfk_complete_destructor:
2977 name = complete_dtor_identifier;
2980 case sfk_base_destructor:
2981 name = base_dtor_identifier;
2984 case sfk_deleting_destructor:
2985 name = deleting_dtor_identifier;
2991 fn = lookup_fnfields (TREE_TYPE (exp), name, /*protect=*/2);
2992 return build_new_method_call (exp, fn,
2994 /*conversion_path=*/NULL_TREE,
2997 tf_warning_or_error);
3000 /* Generate a call to a destructor. TYPE is the type to cast ADDR to.
3001 ADDR is an expression which yields the store to be destroyed.
3002 AUTO_DELETE is the name of the destructor to call, i.e., either
3003 sfk_complete_destructor, sfk_base_destructor, or
3004 sfk_deleting_destructor.
3006 FLAGS is the logical disjunction of zero or more LOOKUP_
3007 flags. See cp-tree.h for more info. */
3010 build_delete (tree type, tree addr, special_function_kind auto_delete,
3011 int flags, int use_global_delete)
3015 if (addr == error_mark_node)
3016 return error_mark_node;
3018 /* Can happen when CURRENT_EXCEPTION_OBJECT gets its type
3019 set to `error_mark_node' before it gets properly cleaned up. */
3020 if (type == error_mark_node)
3021 return error_mark_node;
3023 type = TYPE_MAIN_VARIANT (type);
3025 if (TREE_CODE (type) == POINTER_TYPE)
3027 bool complete_p = true;
3029 type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
3030 if (TREE_CODE (type) == ARRAY_TYPE)
3033 /* We don't want to warn about delete of void*, only other
3034 incomplete types. Deleting other incomplete types
3035 invokes undefined behavior, but it is not ill-formed, so
3036 compile to something that would even do The Right Thing
3037 (TM) should the type have a trivial dtor and no delete
3039 if (!VOID_TYPE_P (type))
3041 complete_type (type);
3042 if (!COMPLETE_TYPE_P (type))
3044 if (warning (0, "possible problem detected in invocation of "
3045 "delete operator:"))
3047 cxx_incomplete_type_diagnostic (addr, type, DK_WARNING);
3048 inform (input_location, "neither the destructor nor the class-specific "
3049 "operator delete will be called, even if they are "
3050 "declared when the class is defined.");
3055 if (VOID_TYPE_P (type) || !complete_p || !MAYBE_CLASS_TYPE_P (type))
3056 /* Call the builtin operator delete. */
3057 return build_builtin_delete_call (addr);
3058 if (TREE_SIDE_EFFECTS (addr))
3059 addr = save_expr (addr);
3061 /* Throw away const and volatile on target type of addr. */
3062 addr = convert_force (build_pointer_type (type), addr, 0);
3064 else if (TREE_CODE (type) == ARRAY_TYPE)
3068 if (TYPE_DOMAIN (type) == NULL_TREE)
3070 error ("unknown array size in delete");
3071 return error_mark_node;
3073 return build_vec_delete (addr, array_type_nelts (type),
3074 auto_delete, use_global_delete);
3078 /* Don't check PROTECT here; leave that decision to the
3079 destructor. If the destructor is accessible, call it,
3080 else report error. */
3081 addr = cp_build_unary_op (ADDR_EXPR, addr, 0, tf_warning_or_error);
3082 if (TREE_SIDE_EFFECTS (addr))
3083 addr = save_expr (addr);
3085 addr = convert_force (build_pointer_type (type), addr, 0);
3088 gcc_assert (MAYBE_CLASS_TYPE_P (type));
3090 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
3092 if (auto_delete != sfk_deleting_destructor)
3093 return void_zero_node;
3095 return build_op_delete_call (DELETE_EXPR, addr,
3096 cxx_sizeof_nowarn (type),
3098 /*placement=*/NULL_TREE,
3099 /*alloc_fn=*/NULL_TREE);
3103 tree head = NULL_TREE;
3104 tree do_delete = NULL_TREE;
3107 if (CLASSTYPE_LAZY_DESTRUCTOR (type))
3108 lazily_declare_fn (sfk_destructor, type);
3110 /* For `::delete x', we must not use the deleting destructor
3111 since then we would not be sure to get the global `operator
3113 if (use_global_delete && auto_delete == sfk_deleting_destructor)
3115 /* We will use ADDR multiple times so we must save it. */
3116 addr = save_expr (addr);
3117 head = get_target_expr (build_headof (addr));
3118 /* Delete the object. */
3119 do_delete = build_builtin_delete_call (head);
3120 /* Otherwise, treat this like a complete object destructor
3122 auto_delete = sfk_complete_destructor;
3124 /* If the destructor is non-virtual, there is no deleting
3125 variant. Instead, we must explicitly call the appropriate
3126 `operator delete' here. */
3127 else if (!DECL_VIRTUAL_P (CLASSTYPE_DESTRUCTORS (type))
3128 && auto_delete == sfk_deleting_destructor)
3130 /* We will use ADDR multiple times so we must save it. */
3131 addr = save_expr (addr);
3132 /* Build the call. */
3133 do_delete = build_op_delete_call (DELETE_EXPR,
3135 cxx_sizeof_nowarn (type),
3137 /*placement=*/NULL_TREE,
3138 /*alloc_fn=*/NULL_TREE);
3139 /* Call the complete object destructor. */
3140 auto_delete = sfk_complete_destructor;
3142 else if (auto_delete == sfk_deleting_destructor
3143 && TYPE_GETS_REG_DELETE (type))
3145 /* Make sure we have access to the member op delete, even though
3146 we'll actually be calling it from the destructor. */
3147 build_op_delete_call (DELETE_EXPR, addr, cxx_sizeof_nowarn (type),
3149 /*placement=*/NULL_TREE,
3150 /*alloc_fn=*/NULL_TREE);
3153 expr = build_dtor_call (cp_build_indirect_ref (addr, NULL,
3154 tf_warning_or_error),
3155 auto_delete, flags);
3157 expr = build2 (COMPOUND_EXPR, void_type_node, expr, do_delete);
3159 /* We need to calculate this before the dtor changes the vptr. */
3161 expr = build2 (COMPOUND_EXPR, void_type_node, head, expr);
3163 if (flags & LOOKUP_DESTRUCTOR)
3164 /* Explicit destructor call; don't check for null pointer. */
3165 ifexp = integer_one_node;
3167 /* Handle deleting a null pointer. */
3168 ifexp = fold (cp_build_binary_op (input_location,
3169 NE_EXPR, addr, integer_zero_node,
3170 tf_warning_or_error));
3172 if (ifexp != integer_one_node)
3173 expr = build3 (COND_EXPR, void_type_node,
3174 ifexp, expr, void_zero_node);
3180 /* At the beginning of a destructor, push cleanups that will call the
3181 destructors for our base classes and members.
3183 Called from begin_destructor_body. */
3186 push_base_cleanups (void)
3188 tree binfo, base_binfo;
3192 VEC(tree,gc) *vbases;
3194 /* Run destructors for all virtual baseclasses. */
3195 if (CLASSTYPE_VBASECLASSES (current_class_type))
3197 tree cond = (condition_conversion
3198 (build2 (BIT_AND_EXPR, integer_type_node,
3199 current_in_charge_parm,
3200 integer_two_node)));
3202 /* The CLASSTYPE_VBASECLASSES vector is in initialization
3203 order, which is also the right order for pushing cleanups. */
3204 for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;
3205 VEC_iterate (tree, vbases, i, base_binfo); i++)
3207 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo)))
3209 expr = build_special_member_call (current_class_ref,
3210 base_dtor_identifier,
3214 | LOOKUP_NONVIRTUAL),
3215 tf_warning_or_error);
3216 expr = build3 (COND_EXPR, void_type_node, cond,
3217 expr, void_zero_node);
3218 finish_decl_cleanup (NULL_TREE, expr);
3223 /* Take care of the remaining baseclasses. */
3224 for (binfo = TYPE_BINFO (current_class_type), i = 0;
3225 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
3227 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo))
3228 || BINFO_VIRTUAL_P (base_binfo))
3231 expr = build_special_member_call (current_class_ref,
3232 base_dtor_identifier,
3233 NULL_TREE, base_binfo,
3234 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL,
3235 tf_warning_or_error);
3236 finish_decl_cleanup (NULL_TREE, expr);
3239 for (member = TYPE_FIELDS (current_class_type); member;
3240 member = TREE_CHAIN (member))
3242 if (TREE_TYPE (member) == error_mark_node
3243 || TREE_CODE (member) != FIELD_DECL
3244 || DECL_ARTIFICIAL (member))
3246 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (member)))
3248 tree this_member = (build_class_member_access_expr
3249 (current_class_ref, member,
3250 /*access_path=*/NULL_TREE,
3251 /*preserve_reference=*/false,
3252 tf_warning_or_error));
3253 tree this_type = TREE_TYPE (member);
3254 expr = build_delete (this_type, this_member,
3255 sfk_complete_destructor,
3256 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR|LOOKUP_NORMAL,
3258 finish_decl_cleanup (NULL_TREE, expr);
3263 /* Build a C++ vector delete expression.
3264 MAXINDEX is the number of elements to be deleted.
3265 ELT_SIZE is the nominal size of each element in the vector.
3266 BASE is the expression that should yield the store to be deleted.
3267 This function expands (or synthesizes) these calls itself.
3268 AUTO_DELETE_VEC says whether the container (vector) should be deallocated.
3270 This also calls delete for virtual baseclasses of elements of the vector.
3272 Update: MAXINDEX is no longer needed. The size can be extracted from the
3273 start of the vector for pointers, and from the type for arrays. We still
3274 use MAXINDEX for arrays because it happens to already have one of the
3275 values we'd have to extract. (We could use MAXINDEX with pointers to
3276 confirm the size, and trap if the numbers differ; not clear that it'd
3277 be worth bothering.) */
3280 build_vec_delete (tree base, tree maxindex,
3281 special_function_kind auto_delete_vec, int use_global_delete)
3285 tree base_init = NULL_TREE;
3287 type = TREE_TYPE (base);
3289 if (TREE_CODE (type) == POINTER_TYPE)
3291 /* Step back one from start of vector, and read dimension. */
3293 tree size_ptr_type = build_pointer_type (sizetype);
3295 if (TREE_SIDE_EFFECTS (base))
3297 base_init = get_target_expr (base);
3298 base = TARGET_EXPR_SLOT (base_init);
3300 type = strip_array_types (TREE_TYPE (type));
3301 cookie_addr = fold_build1 (NEGATE_EXPR, sizetype, TYPE_SIZE_UNIT (sizetype));
3302 cookie_addr = build2 (POINTER_PLUS_EXPR,
3304 fold_convert (size_ptr_type, base),
3306 maxindex = cp_build_indirect_ref (cookie_addr, NULL, tf_warning_or_error);
3308 else if (TREE_CODE (type) == ARRAY_TYPE)
3310 /* Get the total number of things in the array, maxindex is a
3312 maxindex = array_type_nelts_total (type);
3313 type = strip_array_types (type);
3314 base = cp_build_unary_op (ADDR_EXPR, base, 1, tf_warning_or_error);
3315 if (TREE_SIDE_EFFECTS (base))
3317 base_init = get_target_expr (base);
3318 base = TARGET_EXPR_SLOT (base_init);
3323 if (base != error_mark_node)
3324 error ("type to vector delete is neither pointer or array type");
3325 return error_mark_node;
3328 rval = build_vec_delete_1 (base, maxindex, type, auto_delete_vec,
3331 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), base_init, rval);