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
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 2, 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 COPYING. If not, write to
21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
24 /* High-level class interface. */
28 #include "coretypes.h"
40 static bool begin_init_stmts (tree *, tree *);
41 static tree finish_init_stmts (bool, tree, tree);
42 static void construct_virtual_base (tree, tree);
43 static void expand_aggr_init_1 (tree, tree, tree, tree, int);
44 static void expand_default_init (tree, tree, tree, tree, int);
45 static tree build_vec_delete_1 (tree, tree, tree, special_function_kind, int);
46 static void perform_member_init (tree, tree);
47 static tree build_builtin_delete_call (tree);
48 static int member_init_ok_or_else (tree, tree, tree);
49 static void expand_virtual_init (tree, tree);
50 static tree sort_mem_initializers (tree, tree);
51 static tree initializing_context (tree);
52 static void expand_cleanup_for_base (tree, tree);
53 static tree get_temp_regvar (tree, tree);
54 static tree dfs_initialize_vtbl_ptrs (tree, void *);
55 static tree build_default_init (tree, tree);
56 static tree build_dtor_call (tree, special_function_kind, int);
57 static tree build_field_list (tree, tree, int *);
58 static tree build_vtbl_address (tree);
60 /* We are about to generate some complex initialization code.
61 Conceptually, it is all a single expression. However, we may want
62 to include conditionals, loops, and other such statement-level
63 constructs. Therefore, we build the initialization code inside a
64 statement-expression. This function starts such an expression.
65 STMT_EXPR_P and COMPOUND_STMT_P are filled in by this function;
66 pass them back to finish_init_stmts when the expression is
70 begin_init_stmts (tree *stmt_expr_p, tree *compound_stmt_p)
72 bool is_global = !building_stmt_tree ();
74 *stmt_expr_p = begin_stmt_expr ();
75 *compound_stmt_p = begin_compound_stmt (BCS_NO_SCOPE);
80 /* Finish out the statement-expression begun by the previous call to
81 begin_init_stmts. Returns the statement-expression itself. */
84 finish_init_stmts (bool is_global, tree stmt_expr, tree compound_stmt)
86 finish_compound_stmt (compound_stmt);
88 stmt_expr = finish_stmt_expr (stmt_expr, true);
90 gcc_assert (!building_stmt_tree () == is_global);
97 /* Called from initialize_vtbl_ptrs via dfs_walk. BINFO is the base
98 which we want to initialize the vtable pointer for, DATA is
99 TREE_LIST whose TREE_VALUE is the this ptr expression. */
102 dfs_initialize_vtbl_ptrs (tree binfo, void *data)
104 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
105 return dfs_skip_bases;
107 if (!BINFO_PRIMARY_P (binfo) || BINFO_VIRTUAL_P (binfo))
109 tree base_ptr = TREE_VALUE ((tree) data);
111 base_ptr = build_base_path (PLUS_EXPR, base_ptr, binfo, /*nonnull=*/1);
113 expand_virtual_init (binfo, base_ptr);
119 /* Initialize all the vtable pointers in the object pointed to by
123 initialize_vtbl_ptrs (tree addr)
128 type = TREE_TYPE (TREE_TYPE (addr));
129 list = build_tree_list (type, addr);
131 /* Walk through the hierarchy, initializing the vptr in each base
132 class. We do these in pre-order because we can't find the virtual
133 bases for a class until we've initialized the vtbl for that
135 dfs_walk_once (TYPE_BINFO (type), dfs_initialize_vtbl_ptrs, NULL, list);
138 /* Return an expression for the zero-initialization of an object with
139 type T. This expression will either be a constant (in the case
140 that T is a scalar), or a CONSTRUCTOR (in the case that T is an
141 aggregate). In either case, the value can be used as DECL_INITIAL
142 for a decl of the indicated TYPE; it is a valid static initializer.
143 If NELTS is non-NULL, and TYPE is an ARRAY_TYPE, NELTS is the
144 number of elements in the array. If STATIC_STORAGE_P is TRUE,
145 initializers are only generated for entities for which
146 zero-initialization does not simply mean filling the storage with
150 build_zero_init (tree type, tree nelts, bool static_storage_p)
152 tree init = NULL_TREE;
156 To zero-initialization storage for an object of type T means:
158 -- if T is a scalar type, the storage is set to the value of zero
161 -- if T is a non-union class type, the storage for each nonstatic
162 data member and each base-class subobject is zero-initialized.
164 -- if T is a union type, the storage for its first data member is
167 -- if T is an array type, the storage for each element is
170 -- if T is a reference type, no initialization is performed. */
172 gcc_assert (nelts == NULL_TREE || TREE_CODE (nelts) == INTEGER_CST);
174 if (type == error_mark_node)
176 else if (static_storage_p && zero_init_p (type))
177 /* In order to save space, we do not explicitly build initializers
178 for items that do not need them. GCC's semantics are that
179 items with static storage duration that are not otherwise
180 initialized are initialized to zero. */
182 else if (SCALAR_TYPE_P (type))
183 init = convert (type, integer_zero_node);
184 else if (CLASS_TYPE_P (type))
187 VEC(constructor_elt,gc) *v = NULL;
189 /* Iterate over the fields, building initializations. */
190 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
192 if (TREE_CODE (field) != FIELD_DECL)
195 /* Note that for class types there will be FIELD_DECLs
196 corresponding to base classes as well. Thus, iterating
197 over TYPE_FIELDs will result in correct initialization of
198 all of the subobjects. */
199 if (static_storage_p && !zero_init_p (TREE_TYPE (field)))
201 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. */
265 TREE_CONSTANT (init) = 1;
266 TREE_INVARIANT (init) = 1;
272 /* Build an expression for the default-initialization of an object of
273 the indicated TYPE. If NELTS is non-NULL, and TYPE is an
274 ARRAY_TYPE, NELTS is the number of elements in the array. If
275 initialization of TYPE requires calling constructors, this function
276 returns NULL_TREE; the caller is responsible for arranging for the
277 constructors to be called. */
280 build_default_init (tree type, tree nelts)
284 To default-initialize an object of type T means:
286 --if T is a non-POD class type (clause _class_), the default construc-
287 tor for T is called (and the initialization is ill-formed if T has
288 no accessible default constructor);
290 --if T is an array type, each element is default-initialized;
292 --otherwise, the storage for the object is zero-initialized.
294 A program that calls for default-initialization of an entity of refer-
295 ence type is ill-formed. */
297 /* If TYPE_NEEDS_CONSTRUCTING is true, the caller is responsible for
298 performing the initialization. This is confusing in that some
299 non-PODs do not have TYPE_NEEDS_CONSTRUCTING set. (For example,
300 a class with a pointer-to-data member as a non-static data member
301 does not have TYPE_NEEDS_CONSTRUCTING set.) Therefore, we end up
302 passing non-PODs to build_zero_init below, which is contrary to
303 the semantics quoted above from [dcl.init].
305 It happens, however, that the behavior of the constructor the
306 standard says we should have generated would be precisely the
307 same as that obtained by calling build_zero_init below, so things
309 if (TYPE_NEEDS_CONSTRUCTING (type)
310 || (nelts && TREE_CODE (nelts) != INTEGER_CST))
313 /* At this point, TYPE is either a POD class type, an array of POD
314 classes, or something even more innocuous. */
315 return build_zero_init (type, nelts, /*static_storage_p=*/false);
318 /* Initialize MEMBER, a FIELD_DECL, with INIT, a TREE_LIST of
319 arguments. If TREE_LIST is void_type_node, an empty initializer
320 list was given; if NULL_TREE no initializer was given. */
323 perform_member_init (tree member, tree init)
326 tree type = TREE_TYPE (member);
329 explicit = (init != NULL_TREE);
331 /* Effective C++ rule 12 requires that all data members be
333 if (warn_ecpp && !explicit && TREE_CODE (type) != ARRAY_TYPE)
334 warning (OPT_Weffc__, "%J%qD should be initialized in the member initialization "
335 "list", current_function_decl, member);
337 if (init == void_type_node)
340 /* Get an lvalue for the data member. */
341 decl = build_class_member_access_expr (current_class_ref, member,
342 /*access_path=*/NULL_TREE,
343 /*preserve_reference=*/true);
344 if (decl == error_mark_node)
347 /* Deal with this here, as we will get confused if we try to call the
348 assignment op for an anonymous union. This can happen in a
349 synthesized copy constructor. */
350 if (ANON_AGGR_TYPE_P (type))
354 init = build2 (INIT_EXPR, type, decl, TREE_VALUE (init));
355 finish_expr_stmt (init);
358 else if (TYPE_NEEDS_CONSTRUCTING (type))
361 && TREE_CODE (type) == ARRAY_TYPE
363 && TREE_CHAIN (init) == NULL_TREE
364 && TREE_CODE (TREE_TYPE (TREE_VALUE (init))) == ARRAY_TYPE)
366 /* Initialization of one array from another. */
367 finish_expr_stmt (build_vec_init (decl, NULL_TREE, TREE_VALUE (init),
368 /*explicit_default_init_p=*/false,
372 finish_expr_stmt (build_aggr_init (decl, init, 0));
376 if (init == NULL_TREE)
380 init = build_default_init (type, /*nelts=*/NULL_TREE);
381 if (TREE_CODE (type) == REFERENCE_TYPE)
382 warning (0, "%Jdefault-initialization of %q#D, "
383 "which has reference type",
384 current_function_decl, member);
386 /* member traversal: note it leaves init NULL */
387 else if (TREE_CODE (type) == REFERENCE_TYPE)
388 pedwarn ("%Juninitialized reference member %qD",
389 current_function_decl, member);
390 else if (CP_TYPE_CONST_P (type))
391 pedwarn ("%Juninitialized member %qD with %<const%> type %qT",
392 current_function_decl, member, type);
394 else if (TREE_CODE (init) == TREE_LIST)
395 /* There was an explicit member initialization. Do some work
397 init = build_x_compound_expr_from_list (init, "member initializer");
400 finish_expr_stmt (build_modify_expr (decl, INIT_EXPR, init));
403 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
407 expr = build_class_member_access_expr (current_class_ref, member,
408 /*access_path=*/NULL_TREE,
409 /*preserve_reference=*/false);
410 expr = build_delete (type, expr, sfk_complete_destructor,
411 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
413 if (expr != error_mark_node)
414 finish_eh_cleanup (expr);
418 /* Returns a TREE_LIST containing (as the TREE_PURPOSE of each node) all
419 the FIELD_DECLs on the TYPE_FIELDS list for T, in reverse order. */
422 build_field_list (tree t, tree list, int *uses_unions_p)
428 /* Note whether or not T is a union. */
429 if (TREE_CODE (t) == UNION_TYPE)
432 for (fields = TYPE_FIELDS (t); fields; fields = TREE_CHAIN (fields))
434 /* Skip CONST_DECLs for enumeration constants and so forth. */
435 if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields))
438 /* Keep track of whether or not any fields are unions. */
439 if (TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE)
442 /* For an anonymous struct or union, we must recursively
443 consider the fields of the anonymous type. They can be
444 directly initialized from the constructor. */
445 if (ANON_AGGR_TYPE_P (TREE_TYPE (fields)))
447 /* Add this field itself. Synthesized copy constructors
448 initialize the entire aggregate. */
449 list = tree_cons (fields, NULL_TREE, list);
450 /* And now add the fields in the anonymous aggregate. */
451 list = build_field_list (TREE_TYPE (fields), list,
454 /* Add this field. */
455 else if (DECL_NAME (fields))
456 list = tree_cons (fields, NULL_TREE, list);
462 /* The MEM_INITS are a TREE_LIST. The TREE_PURPOSE of each list gives
463 a FIELD_DECL or BINFO in T that needs initialization. The
464 TREE_VALUE gives the initializer, or list of initializer arguments.
466 Return a TREE_LIST containing all of the initializations required
467 for T, in the order in which they should be performed. The output
468 list has the same format as the input. */
471 sort_mem_initializers (tree t, tree mem_inits)
474 tree base, binfo, base_binfo;
477 VEC(tree,gc) *vbases;
481 /* Build up a list of initializations. The TREE_PURPOSE of entry
482 will be the subobject (a FIELD_DECL or BINFO) to initialize. The
483 TREE_VALUE will be the constructor arguments, or NULL if no
484 explicit initialization was provided. */
485 sorted_inits = NULL_TREE;
487 /* Process the virtual bases. */
488 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
489 VEC_iterate (tree, vbases, i, base); i++)
490 sorted_inits = tree_cons (base, NULL_TREE, sorted_inits);
492 /* Process the direct bases. */
493 for (binfo = TYPE_BINFO (t), i = 0;
494 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
495 if (!BINFO_VIRTUAL_P (base_binfo))
496 sorted_inits = tree_cons (base_binfo, NULL_TREE, sorted_inits);
498 /* Process the non-static data members. */
499 sorted_inits = build_field_list (t, sorted_inits, &uses_unions_p);
500 /* Reverse the entire list of initializations, so that they are in
501 the order that they will actually be performed. */
502 sorted_inits = nreverse (sorted_inits);
504 /* If the user presented the initializers in an order different from
505 that in which they will actually occur, we issue a warning. Keep
506 track of the next subobject which can be explicitly initialized
507 without issuing a warning. */
508 next_subobject = sorted_inits;
510 /* Go through the explicit initializers, filling in TREE_PURPOSE in
512 for (init = mem_inits; init; init = TREE_CHAIN (init))
517 subobject = TREE_PURPOSE (init);
519 /* If the explicit initializers are in sorted order, then
520 SUBOBJECT will be NEXT_SUBOBJECT, or something following
522 for (subobject_init = next_subobject;
524 subobject_init = TREE_CHAIN (subobject_init))
525 if (TREE_PURPOSE (subobject_init) == subobject)
528 /* Issue a warning if the explicit initializer order does not
529 match that which will actually occur.
530 ??? Are all these on the correct lines? */
531 if (warn_reorder && !subobject_init)
533 if (TREE_CODE (TREE_PURPOSE (next_subobject)) == FIELD_DECL)
534 warning (OPT_Wreorder, "%q+D will be initialized after",
535 TREE_PURPOSE (next_subobject));
537 warning (OPT_Wreorder, "base %qT will be initialized after",
538 TREE_PURPOSE (next_subobject));
539 if (TREE_CODE (subobject) == FIELD_DECL)
540 warning (OPT_Wreorder, " %q+#D", subobject);
542 warning (OPT_Wreorder, " base %qT", subobject);
543 warning (OPT_Wreorder, "%J when initialized here", current_function_decl);
546 /* Look again, from the beginning of the list. */
549 subobject_init = sorted_inits;
550 while (TREE_PURPOSE (subobject_init) != subobject)
551 subobject_init = TREE_CHAIN (subobject_init);
554 /* It is invalid to initialize the same subobject more than
556 if (TREE_VALUE (subobject_init))
558 if (TREE_CODE (subobject) == FIELD_DECL)
559 error ("%Jmultiple initializations given for %qD",
560 current_function_decl, subobject);
562 error ("%Jmultiple initializations given for base %qT",
563 current_function_decl, subobject);
566 /* Record the initialization. */
567 TREE_VALUE (subobject_init) = TREE_VALUE (init);
568 next_subobject = subobject_init;
573 If a ctor-initializer specifies more than one mem-initializer for
574 multiple members of the same union (including members of
575 anonymous unions), the ctor-initializer is ill-formed. */
578 tree last_field = NULL_TREE;
579 for (init = sorted_inits; init; init = TREE_CHAIN (init))
585 /* Skip uninitialized members and base classes. */
586 if (!TREE_VALUE (init)
587 || TREE_CODE (TREE_PURPOSE (init)) != FIELD_DECL)
589 /* See if this field is a member of a union, or a member of a
590 structure contained in a union, etc. */
591 field = TREE_PURPOSE (init);
592 for (field_type = DECL_CONTEXT (field);
593 !same_type_p (field_type, t);
594 field_type = TYPE_CONTEXT (field_type))
595 if (TREE_CODE (field_type) == UNION_TYPE)
597 /* If this field is not a member of a union, skip it. */
598 if (TREE_CODE (field_type) != UNION_TYPE)
601 /* It's only an error if we have two initializers for the same
609 /* See if LAST_FIELD and the field initialized by INIT are
610 members of the same union. If so, there's a problem,
611 unless they're actually members of the same structure
612 which is itself a member of a union. For example, given:
614 union { struct { int i; int j; }; };
616 initializing both `i' and `j' makes sense. */
617 field_type = DECL_CONTEXT (field);
621 tree last_field_type;
623 last_field_type = DECL_CONTEXT (last_field);
626 if (same_type_p (last_field_type, field_type))
628 if (TREE_CODE (field_type) == UNION_TYPE)
629 error ("%Jinitializations for multiple members of %qT",
630 current_function_decl, last_field_type);
635 if (same_type_p (last_field_type, t))
638 last_field_type = TYPE_CONTEXT (last_field_type);
641 /* If we've reached the outermost class, then we're
643 if (same_type_p (field_type, t))
646 field_type = TYPE_CONTEXT (field_type);
657 /* Initialize all bases and members of CURRENT_CLASS_TYPE. MEM_INITS
658 is a TREE_LIST giving the explicit mem-initializer-list for the
659 constructor. The TREE_PURPOSE of each entry is a subobject (a
660 FIELD_DECL or a BINFO) of the CURRENT_CLASS_TYPE. The TREE_VALUE
661 is a TREE_LIST giving the arguments to the constructor or
662 void_type_node for an empty list of arguments. */
665 emit_mem_initializers (tree mem_inits)
667 /* We will already have issued an error message about the fact that
668 the type is incomplete. */
669 if (!COMPLETE_TYPE_P (current_class_type))
672 /* Sort the mem-initializers into the order in which the
673 initializations should be performed. */
674 mem_inits = sort_mem_initializers (current_class_type, mem_inits);
676 in_base_initializer = 1;
678 /* Initialize base classes. */
680 && TREE_CODE (TREE_PURPOSE (mem_inits)) != FIELD_DECL)
682 tree subobject = TREE_PURPOSE (mem_inits);
683 tree arguments = TREE_VALUE (mem_inits);
685 /* If these initializations are taking place in a copy
686 constructor, the base class should probably be explicitly
688 if (extra_warnings && !arguments
689 && DECL_COPY_CONSTRUCTOR_P (current_function_decl)
690 && TYPE_NEEDS_CONSTRUCTING (BINFO_TYPE (subobject)))
691 warning (OPT_Wextra, "%Jbase class %q#T should be explicitly initialized in the "
693 current_function_decl, BINFO_TYPE (subobject));
695 /* If an explicit -- but empty -- initializer list was present,
696 treat it just like default initialization at this point. */
697 if (arguments == void_type_node)
698 arguments = NULL_TREE;
700 /* Initialize the base. */
701 if (BINFO_VIRTUAL_P (subobject))
702 construct_virtual_base (subobject, arguments);
707 base_addr = build_base_path (PLUS_EXPR, current_class_ptr,
709 expand_aggr_init_1 (subobject, NULL_TREE,
710 build_indirect_ref (base_addr, NULL),
713 expand_cleanup_for_base (subobject, NULL_TREE);
716 mem_inits = TREE_CHAIN (mem_inits);
718 in_base_initializer = 0;
720 /* Initialize the vptrs. */
721 initialize_vtbl_ptrs (current_class_ptr);
723 /* Initialize the data members. */
726 perform_member_init (TREE_PURPOSE (mem_inits),
727 TREE_VALUE (mem_inits));
728 mem_inits = TREE_CHAIN (mem_inits);
732 /* Returns the address of the vtable (i.e., the value that should be
733 assigned to the vptr) for BINFO. */
736 build_vtbl_address (tree binfo)
738 tree binfo_for = binfo;
741 if (BINFO_VPTR_INDEX (binfo) && BINFO_VIRTUAL_P (binfo))
742 /* If this is a virtual primary base, then the vtable we want to store
743 is that for the base this is being used as the primary base of. We
744 can't simply skip the initialization, because we may be expanding the
745 inits of a subobject constructor where the virtual base layout
747 while (BINFO_PRIMARY_P (binfo_for))
748 binfo_for = BINFO_INHERITANCE_CHAIN (binfo_for);
750 /* Figure out what vtable BINFO's vtable is based on, and mark it as
752 vtbl = get_vtbl_decl_for_binfo (binfo_for);
753 assemble_external (vtbl);
754 TREE_USED (vtbl) = 1;
756 /* Now compute the address to use when initializing the vptr. */
757 vtbl = unshare_expr (BINFO_VTABLE (binfo_for));
758 if (TREE_CODE (vtbl) == VAR_DECL)
759 vtbl = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (vtbl)), vtbl);
764 /* This code sets up the virtual function tables appropriate for
765 the pointer DECL. It is a one-ply initialization.
767 BINFO is the exact type that DECL is supposed to be. In
768 multiple inheritance, this might mean "C's A" if C : A, B. */
771 expand_virtual_init (tree binfo, tree decl)
776 /* Compute the initializer for vptr. */
777 vtbl = build_vtbl_address (binfo);
779 /* We may get this vptr from a VTT, if this is a subobject
780 constructor or subobject destructor. */
781 vtt_index = BINFO_VPTR_INDEX (binfo);
787 /* Compute the value to use, when there's a VTT. */
788 vtt_parm = current_vtt_parm;
789 vtbl2 = build2 (POINTER_PLUS_EXPR,
790 TREE_TYPE (vtt_parm),
793 vtbl2 = build_indirect_ref (vtbl2, NULL);
794 vtbl2 = convert (TREE_TYPE (vtbl), vtbl2);
796 /* The actual initializer is the VTT value only in the subobject
797 constructor. In maybe_clone_body we'll substitute NULL for
798 the vtt_parm in the case of the non-subobject constructor. */
799 vtbl = build3 (COND_EXPR,
801 build2 (EQ_EXPR, boolean_type_node,
802 current_in_charge_parm, integer_zero_node),
807 /* Compute the location of the vtpr. */
808 vtbl_ptr = build_vfield_ref (build_indirect_ref (decl, NULL),
810 gcc_assert (vtbl_ptr != error_mark_node);
812 /* Assign the vtable to the vptr. */
813 vtbl = convert_force (TREE_TYPE (vtbl_ptr), vtbl, 0);
814 finish_expr_stmt (build_modify_expr (vtbl_ptr, NOP_EXPR, vtbl));
817 /* If an exception is thrown in a constructor, those base classes already
818 constructed must be destroyed. This function creates the cleanup
819 for BINFO, which has just been constructed. If FLAG is non-NULL,
820 it is a DECL which is nonzero when this base needs to be
824 expand_cleanup_for_base (tree binfo, tree flag)
828 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (binfo)))
831 /* Call the destructor. */
832 expr = build_special_member_call (current_class_ref,
833 base_dtor_identifier,
836 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL);
838 expr = fold_build3 (COND_EXPR, void_type_node,
839 c_common_truthvalue_conversion (flag),
840 expr, integer_zero_node);
842 finish_eh_cleanup (expr);
845 /* Construct the virtual base-class VBASE passing the ARGUMENTS to its
849 construct_virtual_base (tree vbase, tree arguments)
855 /* If there are virtual base classes with destructors, we need to
856 emit cleanups to destroy them if an exception is thrown during
857 the construction process. These exception regions (i.e., the
858 period during which the cleanups must occur) begin from the time
859 the construction is complete to the end of the function. If we
860 create a conditional block in which to initialize the
861 base-classes, then the cleanup region for the virtual base begins
862 inside a block, and ends outside of that block. This situation
863 confuses the sjlj exception-handling code. Therefore, we do not
864 create a single conditional block, but one for each
865 initialization. (That way the cleanup regions always begin
866 in the outer block.) We trust the back end to figure out
867 that the FLAG will not change across initializations, and
868 avoid doing multiple tests. */
869 flag = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl));
870 inner_if_stmt = begin_if_stmt ();
871 finish_if_stmt_cond (flag, inner_if_stmt);
873 /* Compute the location of the virtual base. If we're
874 constructing virtual bases, then we must be the most derived
875 class. Therefore, we don't have to look up the virtual base;
876 we already know where it is. */
877 exp = convert_to_base_statically (current_class_ref, vbase);
879 expand_aggr_init_1 (vbase, current_class_ref, exp, arguments,
881 finish_then_clause (inner_if_stmt);
882 finish_if_stmt (inner_if_stmt);
884 expand_cleanup_for_base (vbase, flag);
887 /* Find the context in which this FIELD can be initialized. */
890 initializing_context (tree field)
892 tree t = DECL_CONTEXT (field);
894 /* Anonymous union members can be initialized in the first enclosing
895 non-anonymous union context. */
896 while (t && ANON_AGGR_TYPE_P (t))
897 t = TYPE_CONTEXT (t);
901 /* Function to give error message if member initialization specification
902 is erroneous. FIELD is the member we decided to initialize.
903 TYPE is the type for which the initialization is being performed.
904 FIELD must be a member of TYPE.
906 MEMBER_NAME is the name of the member. */
909 member_init_ok_or_else (tree field, tree type, tree member_name)
911 if (field == error_mark_node)
915 error ("class %qT does not have any field named %qD", type,
919 if (TREE_CODE (field) == VAR_DECL)
921 error ("%q#D is a static data member; it can only be "
922 "initialized at its definition",
926 if (TREE_CODE (field) != FIELD_DECL)
928 error ("%q#D is not a non-static data member of %qT",
932 if (initializing_context (field) != type)
934 error ("class %qT does not have any field named %qD", type,
942 /* NAME is a FIELD_DECL, an IDENTIFIER_NODE which names a field, or it
943 is a _TYPE node or TYPE_DECL which names a base for that type.
944 Check the validity of NAME, and return either the base _TYPE, base
945 binfo, or the FIELD_DECL of the member. If NAME is invalid, return
946 NULL_TREE and issue a diagnostic.
948 An old style unnamed direct single base construction is permitted,
949 where NAME is NULL. */
952 expand_member_init (tree name)
957 if (!current_class_ref)
962 /* This is an obsolete unnamed base class initializer. The
963 parser will already have warned about its use. */
964 switch (BINFO_N_BASE_BINFOS (TYPE_BINFO (current_class_type)))
967 error ("unnamed initializer for %qT, which has no base classes",
971 basetype = BINFO_TYPE
972 (BINFO_BASE_BINFO (TYPE_BINFO (current_class_type), 0));
975 error ("unnamed initializer for %qT, which uses multiple inheritance",
980 else if (TYPE_P (name))
982 basetype = TYPE_MAIN_VARIANT (name);
983 name = TYPE_NAME (name);
985 else if (TREE_CODE (name) == TYPE_DECL)
986 basetype = TYPE_MAIN_VARIANT (TREE_TYPE (name));
988 basetype = NULL_TREE;
997 if (current_template_parms)
1000 class_binfo = TYPE_BINFO (current_class_type);
1001 direct_binfo = NULL_TREE;
1002 virtual_binfo = NULL_TREE;
1004 /* Look for a direct base. */
1005 for (i = 0; BINFO_BASE_ITERATE (class_binfo, i, direct_binfo); ++i)
1006 if (SAME_BINFO_TYPE_P (BINFO_TYPE (direct_binfo), basetype))
1009 /* Look for a virtual base -- unless the direct base is itself
1011 if (!direct_binfo || !BINFO_VIRTUAL_P (direct_binfo))
1012 virtual_binfo = binfo_for_vbase (basetype, current_class_type);
1014 /* [class.base.init]
1016 If a mem-initializer-id is ambiguous because it designates
1017 both a direct non-virtual base class and an inherited virtual
1018 base class, the mem-initializer is ill-formed. */
1019 if (direct_binfo && virtual_binfo)
1021 error ("%qD is both a direct base and an indirect virtual base",
1026 if (!direct_binfo && !virtual_binfo)
1028 if (CLASSTYPE_VBASECLASSES (current_class_type))
1029 error ("type %qT is not a direct or virtual base of %qT",
1030 basetype, current_class_type);
1032 error ("type %qT is not a direct base of %qT",
1033 basetype, current_class_type);
1037 return direct_binfo ? direct_binfo : virtual_binfo;
1041 if (TREE_CODE (name) == IDENTIFIER_NODE)
1042 field = lookup_field (current_class_type, name, 1, false);
1046 if (member_init_ok_or_else (field, current_class_type, name))
1053 /* This is like `expand_member_init', only it stores one aggregate
1056 INIT comes in two flavors: it is either a value which
1057 is to be stored in EXP, or it is a parameter list
1058 to go to a constructor, which will operate on EXP.
1059 If INIT is not a parameter list for a constructor, then set
1060 LOOKUP_ONLYCONVERTING.
1061 If FLAGS is LOOKUP_ONLYCONVERTING then it is the = init form of
1062 the initializer, if FLAGS is 0, then it is the (init) form.
1063 If `init' is a CONSTRUCTOR, then we emit a warning message,
1064 explaining that such initializations are invalid.
1066 If INIT resolves to a CALL_EXPR which happens to return
1067 something of the type we are looking for, then we know
1068 that we can safely use that call to perform the
1071 The virtual function table pointer cannot be set up here, because
1072 we do not really know its type.
1074 This never calls operator=().
1076 When initializing, nothing is CONST.
1078 A default copy constructor may have to be used to perform the
1081 A constructor or a conversion operator may have to be used to
1082 perform the initialization, but not both, as it would be ambiguous. */
1085 build_aggr_init (tree exp, tree init, int flags)
1090 tree type = TREE_TYPE (exp);
1091 int was_const = TREE_READONLY (exp);
1092 int was_volatile = TREE_THIS_VOLATILE (exp);
1095 if (init == error_mark_node)
1096 return error_mark_node;
1098 TREE_READONLY (exp) = 0;
1099 TREE_THIS_VOLATILE (exp) = 0;
1101 if (init && TREE_CODE (init) != TREE_LIST)
1102 flags |= LOOKUP_ONLYCONVERTING;
1104 if (TREE_CODE (type) == ARRAY_TYPE)
1108 /* An array may not be initialized use the parenthesized
1109 initialization form -- unless the initializer is "()". */
1110 if (init && TREE_CODE (init) == TREE_LIST)
1112 error ("bad array initializer");
1113 return error_mark_node;
1115 /* Must arrange to initialize each element of EXP
1116 from elements of INIT. */
1117 itype = init ? TREE_TYPE (init) : NULL_TREE;
1118 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
1119 TREE_TYPE (exp) = TYPE_MAIN_VARIANT (type);
1120 if (itype && cp_type_quals (itype) != TYPE_UNQUALIFIED)
1121 itype = TREE_TYPE (init) = TYPE_MAIN_VARIANT (itype);
1122 stmt_expr = build_vec_init (exp, NULL_TREE, init,
1123 /*explicit_default_init_p=*/false,
1124 itype && same_type_p (itype,
1126 TREE_READONLY (exp) = was_const;
1127 TREE_THIS_VOLATILE (exp) = was_volatile;
1128 TREE_TYPE (exp) = type;
1130 TREE_TYPE (init) = itype;
1134 if (TREE_CODE (exp) == VAR_DECL || TREE_CODE (exp) == PARM_DECL)
1135 /* Just know that we've seen something for this node. */
1136 TREE_USED (exp) = 1;
1138 TREE_TYPE (exp) = TYPE_MAIN_VARIANT (type);
1139 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
1140 destroy_temps = stmts_are_full_exprs_p ();
1141 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
1142 expand_aggr_init_1 (TYPE_BINFO (type), exp, exp,
1143 init, LOOKUP_NORMAL|flags);
1144 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
1145 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
1146 TREE_TYPE (exp) = type;
1147 TREE_READONLY (exp) = was_const;
1148 TREE_THIS_VOLATILE (exp) = was_volatile;
1154 expand_default_init (tree binfo, tree true_exp, tree exp, tree init, int flags)
1156 tree type = TREE_TYPE (exp);
1159 /* It fails because there may not be a constructor which takes
1160 its own type as the first (or only parameter), but which does
1161 take other types via a conversion. So, if the thing initializing
1162 the expression is a unit element of type X, first try X(X&),
1163 followed by initialization by X. If neither of these work
1164 out, then look hard. */
1168 if (init && TREE_CODE (init) != TREE_LIST
1169 && (flags & LOOKUP_ONLYCONVERTING))
1171 /* Base subobjects should only get direct-initialization. */
1172 gcc_assert (true_exp == exp);
1174 if (flags & DIRECT_BIND)
1175 /* Do nothing. We hit this in two cases: Reference initialization,
1176 where we aren't initializing a real variable, so we don't want
1177 to run a new constructor; and catching an exception, where we
1178 have already built up the constructor call so we could wrap it
1179 in an exception region. */;
1180 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
1182 /* A brace-enclosed initializer for an aggregate. */
1183 gcc_assert (CP_AGGREGATE_TYPE_P (type));
1184 init = digest_init (type, init);
1187 init = ocp_convert (type, init, CONV_IMPLICIT|CONV_FORCE_TEMP, flags);
1189 if (TREE_CODE (init) == MUST_NOT_THROW_EXPR)
1190 /* We need to protect the initialization of a catch parm with a
1191 call to terminate(), which shows up as a MUST_NOT_THROW_EXPR
1192 around the TARGET_EXPR for the copy constructor. See
1193 initialize_handler_parm. */
1195 TREE_OPERAND (init, 0) = build2 (INIT_EXPR, TREE_TYPE (exp), exp,
1196 TREE_OPERAND (init, 0));
1197 TREE_TYPE (init) = void_type_node;
1200 init = build2 (INIT_EXPR, TREE_TYPE (exp), exp, init);
1201 TREE_SIDE_EFFECTS (init) = 1;
1202 finish_expr_stmt (init);
1206 if (init == NULL_TREE
1207 || (TREE_CODE (init) == TREE_LIST && ! TREE_TYPE (init)))
1211 init = TREE_VALUE (parms);
1214 parms = build_tree_list (NULL_TREE, init);
1216 if (true_exp == exp)
1217 ctor_name = complete_ctor_identifier;
1219 ctor_name = base_ctor_identifier;
1221 rval = build_special_member_call (exp, ctor_name, parms, binfo, flags);
1222 if (TREE_SIDE_EFFECTS (rval))
1223 finish_expr_stmt (convert_to_void (rval, NULL));
1226 /* This function is responsible for initializing EXP with INIT
1229 BINFO is the binfo of the type for who we are performing the
1230 initialization. For example, if W is a virtual base class of A and B,
1232 If we are initializing B, then W must contain B's W vtable, whereas
1233 were we initializing C, W must contain C's W vtable.
1235 TRUE_EXP is nonzero if it is the true expression being initialized.
1236 In this case, it may be EXP, or may just contain EXP. The reason we
1237 need this is because if EXP is a base element of TRUE_EXP, we
1238 don't necessarily know by looking at EXP where its virtual
1239 baseclass fields should really be pointing. But we do know
1240 from TRUE_EXP. In constructors, we don't know anything about
1241 the value being initialized.
1243 FLAGS is just passed to `build_new_method_call'. See that function
1244 for its description. */
1247 expand_aggr_init_1 (tree binfo, tree true_exp, tree exp, tree init, int flags)
1249 tree type = TREE_TYPE (exp);
1251 gcc_assert (init != error_mark_node && type != error_mark_node);
1252 gcc_assert (building_stmt_tree ());
1254 /* Use a function returning the desired type to initialize EXP for us.
1255 If the function is a constructor, and its first argument is
1256 NULL_TREE, know that it was meant for us--just slide exp on
1257 in and expand the constructor. Constructors now come
1260 if (init && TREE_CODE (exp) == VAR_DECL
1261 && COMPOUND_LITERAL_P (init))
1263 /* If store_init_value returns NULL_TREE, the INIT has been
1264 recorded as the DECL_INITIAL for EXP. That means there's
1265 nothing more we have to do. */
1266 init = store_init_value (exp, init);
1268 finish_expr_stmt (init);
1272 /* We know that expand_default_init can handle everything we want
1274 expand_default_init (binfo, true_exp, exp, init, flags);
1277 /* Report an error if TYPE is not a user-defined, aggregate type. If
1278 OR_ELSE is nonzero, give an error message. */
1281 is_aggr_type (tree type, int or_else)
1283 if (type == error_mark_node)
1286 if (! IS_AGGR_TYPE (type)
1287 && TREE_CODE (type) != TEMPLATE_TYPE_PARM
1288 && TREE_CODE (type) != BOUND_TEMPLATE_TEMPLATE_PARM)
1291 error ("%qT is not an aggregate type", type);
1298 get_type_value (tree name)
1300 if (name == error_mark_node)
1303 if (IDENTIFIER_HAS_TYPE_VALUE (name))
1304 return IDENTIFIER_TYPE_VALUE (name);
1309 /* Build a reference to a member of an aggregate. This is not a C++
1310 `&', but really something which can have its address taken, and
1311 then act as a pointer to member, for example TYPE :: FIELD can have
1312 its address taken by saying & TYPE :: FIELD. ADDRESS_P is true if
1313 this expression is the operand of "&".
1315 @@ Prints out lousy diagnostics for operator <typename>
1318 @@ This function should be rewritten and placed in search.c. */
1321 build_offset_ref (tree type, tree member, bool address_p)
1324 tree basebinfo = NULL_TREE;
1326 /* class templates can come in as TEMPLATE_DECLs here. */
1327 if (TREE_CODE (member) == TEMPLATE_DECL)
1330 if (dependent_type_p (type) || type_dependent_expression_p (member))
1331 return build_qualified_name (NULL_TREE, type, member,
1332 /*template_p=*/false);
1334 gcc_assert (TYPE_P (type));
1335 if (! is_aggr_type (type, 1))
1336 return error_mark_node;
1338 gcc_assert (DECL_P (member) || BASELINK_P (member));
1339 /* Callers should call mark_used before this point. */
1340 gcc_assert (!DECL_P (member) || TREE_USED (member));
1342 if (!COMPLETE_TYPE_P (complete_type (type))
1343 && !TYPE_BEING_DEFINED (type))
1345 error ("incomplete type %qT does not have member %qD", type, member);
1346 return error_mark_node;
1349 /* Entities other than non-static members need no further
1351 if (TREE_CODE (member) == TYPE_DECL)
1353 if (TREE_CODE (member) == VAR_DECL || TREE_CODE (member) == CONST_DECL)
1354 return convert_from_reference (member);
1356 if (TREE_CODE (member) == FIELD_DECL && DECL_C_BIT_FIELD (member))
1358 error ("invalid pointer to bit-field %qD", member);
1359 return error_mark_node;
1362 /* Set up BASEBINFO for member lookup. */
1363 decl = maybe_dummy_object (type, &basebinfo);
1365 /* A lot of this logic is now handled in lookup_member. */
1366 if (BASELINK_P (member))
1368 /* Go from the TREE_BASELINK to the member function info. */
1369 tree t = BASELINK_FUNCTIONS (member);
1371 if (TREE_CODE (t) != TEMPLATE_ID_EXPR && !really_overloaded_fn (t))
1373 /* Get rid of a potential OVERLOAD around it. */
1374 t = OVL_CURRENT (t);
1376 /* Unique functions are handled easily. */
1378 /* For non-static member of base class, we need a special rule
1379 for access checking [class.protected]:
1381 If the access is to form a pointer to member, the
1382 nested-name-specifier shall name the derived class
1383 (or any class derived from that class). */
1384 if (address_p && DECL_P (t)
1385 && DECL_NONSTATIC_MEMBER_P (t))
1386 perform_or_defer_access_check (TYPE_BINFO (type), t, t);
1388 perform_or_defer_access_check (basebinfo, t, t);
1390 if (DECL_STATIC_FUNCTION_P (t))
1395 TREE_TYPE (member) = unknown_type_node;
1397 else if (address_p && TREE_CODE (member) == FIELD_DECL)
1398 /* We need additional test besides the one in
1399 check_accessibility_of_qualified_id in case it is
1400 a pointer to non-static member. */
1401 perform_or_defer_access_check (TYPE_BINFO (type), member, member);
1405 /* If MEMBER is non-static, then the program has fallen afoul of
1408 An id-expression that denotes a nonstatic data member or
1409 nonstatic member function of a class can only be used:
1411 -- as part of a class member access (_expr.ref_) in which the
1412 object-expression refers to the member's class or a class
1413 derived from that class, or
1415 -- to form a pointer to member (_expr.unary.op_), or
1417 -- in the body of a nonstatic member function of that class or
1418 of a class derived from that class (_class.mfct.nonstatic_), or
1420 -- in a mem-initializer for a constructor for that class or for
1421 a class derived from that class (_class.base.init_). */
1422 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (member))
1424 /* Build a representation of a the qualified name suitable
1425 for use as the operand to "&" -- even though the "&" is
1426 not actually present. */
1427 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1428 /* In Microsoft mode, treat a non-static member function as if
1429 it were a pointer-to-member. */
1430 if (flag_ms_extensions)
1432 PTRMEM_OK_P (member) = 1;
1433 return build_unary_op (ADDR_EXPR, member, 0);
1435 error ("invalid use of non-static member function %qD",
1436 TREE_OPERAND (member, 1));
1437 return error_mark_node;
1439 else if (TREE_CODE (member) == FIELD_DECL)
1441 error ("invalid use of non-static data member %qD", member);
1442 return error_mark_node;
1447 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1448 PTRMEM_OK_P (member) = 1;
1452 /* If DECL is a scalar enumeration constant or variable with a
1453 constant initializer, return the initializer (or, its initializers,
1454 recursively); otherwise, return DECL. If INTEGRAL_P, the
1455 initializer is only returned if DECL is an integral
1456 constant-expression. */
1459 constant_value_1 (tree decl, bool integral_p)
1461 while (TREE_CODE (decl) == CONST_DECL
1463 ? DECL_INTEGRAL_CONSTANT_VAR_P (decl)
1464 : (TREE_CODE (decl) == VAR_DECL
1465 && CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (decl)))))
1468 /* Static data members in template classes may have
1469 non-dependent initializers. References to such non-static
1470 data members are not value-dependent, so we must retrieve the
1471 initializer here. The DECL_INITIAL will have the right type,
1472 but will not have been folded because that would prevent us
1473 from performing all appropriate semantic checks at
1474 instantiation time. */
1475 if (DECL_CLASS_SCOPE_P (decl)
1476 && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (decl))
1477 && uses_template_parms (CLASSTYPE_TI_ARGS
1478 (DECL_CONTEXT (decl))))
1480 ++processing_template_decl;
1481 init = fold_non_dependent_expr (DECL_INITIAL (decl));
1482 --processing_template_decl;
1486 /* If DECL is a static data member in a template
1487 specialization, we must instantiate it here. The
1488 initializer for the static data member is not processed
1489 until needed; we need it now. */
1491 init = DECL_INITIAL (decl);
1493 if (init == error_mark_node)
1496 || !TREE_TYPE (init)
1498 ? !INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (init))
1499 : (!TREE_CONSTANT (init)
1500 /* Do not return an aggregate constant (of which
1501 string literals are a special case), as we do not
1502 want to make inadvertent copies of such entities,
1503 and we must be sure that their addresses are the
1505 || TREE_CODE (init) == CONSTRUCTOR
1506 || TREE_CODE (init) == STRING_CST)))
1508 decl = unshare_expr (init);
1513 /* If DECL is a CONST_DECL, or a constant VAR_DECL initialized by
1514 constant of integral or enumeration type, then return that value.
1515 These are those variables permitted in constant expressions by
1519 integral_constant_value (tree decl)
1521 return constant_value_1 (decl, /*integral_p=*/true);
1524 /* A more relaxed version of integral_constant_value, used by the
1525 common C/C++ code and by the C++ front end for optimization
1529 decl_constant_value (tree decl)
1531 return constant_value_1 (decl,
1532 /*integral_p=*/processing_template_decl);
1535 /* Common subroutines of build_new and build_vec_delete. */
1537 /* Call the global __builtin_delete to delete ADDR. */
1540 build_builtin_delete_call (tree addr)
1542 mark_used (global_delete_fndecl);
1543 return build_call_n (global_delete_fndecl, 1, addr);
1546 /* Build and return a NEW_EXPR. If NELTS is non-NULL, TYPE[NELTS] is
1547 the type of the object being allocated; otherwise, it's just TYPE.
1548 INIT is the initializer, if any. USE_GLOBAL_NEW is true if the
1549 user explicitly wrote "::operator new". PLACEMENT, if non-NULL, is
1550 the TREE_LIST of arguments to be provided as arguments to a
1551 placement new operator. This routine performs no semantic checks;
1552 it just creates and returns a NEW_EXPR. */
1555 build_raw_new_expr (tree placement, tree type, tree nelts, tree init,
1560 new_expr = build4 (NEW_EXPR, build_pointer_type (type), placement, type,
1562 NEW_EXPR_USE_GLOBAL (new_expr) = use_global_new;
1563 TREE_SIDE_EFFECTS (new_expr) = 1;
1568 /* Make sure that there are no aliasing issues with T, a placement new
1569 expression applied to PLACEMENT, by recording the change in dynamic
1570 type. If placement new is inlined, as it is with libstdc++, and if
1571 the type of the placement new differs from the type of the
1572 placement location itself, then alias analysis may think it is OK
1573 to interchange writes to the location from before the placement new
1574 and from after the placement new. We have to prevent type-based
1575 alias analysis from applying. PLACEMENT may be NULL, which means
1576 that we couldn't capture it in a temporary variable, in which case
1577 we use a memory clobber. */
1580 avoid_placement_new_aliasing (tree t, tree placement)
1584 if (processing_template_decl)
1587 /* If we are not using type based aliasing, we don't have to do
1589 if (!flag_strict_aliasing)
1592 /* If we have a pointer and a location, record the change in dynamic
1593 type. Otherwise we need a general memory clobber. */
1594 if (TREE_CODE (TREE_TYPE (t)) == POINTER_TYPE
1595 && placement != NULL_TREE
1596 && TREE_CODE (TREE_TYPE (placement)) == POINTER_TYPE)
1597 type_change = build_stmt (CHANGE_DYNAMIC_TYPE_EXPR,
1602 /* Build a memory clobber. */
1603 type_change = build_stmt (ASM_EXPR,
1604 build_string (0, ""),
1607 tree_cons (NULL_TREE,
1608 build_string (6, "memory"),
1611 ASM_VOLATILE_P (type_change) = 1;
1614 return build2 (COMPOUND_EXPR, TREE_TYPE (t), type_change, t);
1617 /* Generate code for a new-expression, including calling the "operator
1618 new" function, initializing the object, and, if an exception occurs
1619 during construction, cleaning up. The arguments are as for
1620 build_raw_new_expr. */
1623 build_new_1 (tree placement, tree type, tree nelts, tree init,
1624 bool globally_qualified_p)
1627 /* True iff this is a call to "operator new[]" instead of just
1629 bool array_p = false;
1630 /* True iff ARRAY_P is true and the bound of the array type is
1631 not necessarily a compile time constant. For example, VLA_P is
1632 true for "new int[f()]". */
1634 /* The type being allocated. If ARRAY_P is true, this will be an
1637 /* If ARRAY_P is true, the element type of the array. This is an
1638 never ARRAY_TYPE; for something like "new int[3][4]", the
1639 ELT_TYPE is "int". If ARRAY_P is false, this is the same type as
1642 /* The type of the new-expression. (This type is always a pointer
1645 /* A pointer type pointing to the FULL_TYPE. */
1646 tree full_pointer_type;
1647 tree outer_nelts = NULL_TREE;
1648 tree alloc_call, alloc_expr;
1649 /* The address returned by the call to "operator new". This node is
1650 a VAR_DECL and is therefore reusable. */
1653 tree cookie_expr, init_expr;
1654 int nothrow, check_new;
1655 int use_java_new = 0;
1656 /* If non-NULL, the number of extra bytes to allocate at the
1657 beginning of the storage allocated for an array-new expression in
1658 order to store the number of elements. */
1659 tree cookie_size = NULL_TREE;
1661 /* True if the function we are calling is a placement allocation
1663 bool placement_allocation_fn_p;
1664 tree args = NULL_TREE;
1665 /* True if the storage must be initialized, either by a constructor
1666 or due to an explicit new-initializer. */
1667 bool is_initialized;
1668 /* The address of the thing allocated, not including any cookie. In
1669 particular, if an array cookie is in use, DATA_ADDR is the
1670 address of the first array element. This node is a VAR_DECL, and
1671 is therefore reusable. */
1673 tree init_preeval_expr = NULL_TREE;
1679 outer_nelts = nelts;
1682 /* ??? The middle-end will error on us for building a VLA outside a
1683 function context. Methinks that's not it's purvey. So we'll do
1684 our own VLA layout later. */
1686 index = convert (sizetype, nelts);
1687 index = size_binop (MINUS_EXPR, index, size_one_node);
1688 index = build_index_type (index);
1689 full_type = build_cplus_array_type (type, NULL_TREE);
1690 /* We need a copy of the type as build_array_type will return a shared copy
1691 of the incomplete array type. */
1692 full_type = build_distinct_type_copy (full_type);
1693 TYPE_DOMAIN (full_type) = index;
1698 if (TREE_CODE (type) == ARRAY_TYPE)
1701 nelts = array_type_nelts_top (type);
1702 outer_nelts = nelts;
1703 type = TREE_TYPE (type);
1707 if (!complete_type_or_else (type, NULL_TREE))
1708 return error_mark_node;
1710 /* If our base type is an array, then make sure we know how many elements
1712 for (elt_type = type;
1713 TREE_CODE (elt_type) == ARRAY_TYPE;
1714 elt_type = TREE_TYPE (elt_type))
1715 nelts = cp_build_binary_op (MULT_EXPR, nelts,
1716 array_type_nelts_top (elt_type));
1718 if (TREE_CODE (elt_type) == VOID_TYPE)
1720 error ("invalid type %<void%> for new");
1721 return error_mark_node;
1724 if (abstract_virtuals_error (NULL_TREE, elt_type))
1725 return error_mark_node;
1727 is_initialized = (TYPE_NEEDS_CONSTRUCTING (elt_type) || init);
1728 if (CP_TYPE_CONST_P (elt_type) && !is_initialized)
1730 error ("uninitialized const in %<new%> of %q#T", elt_type);
1731 return error_mark_node;
1734 size = size_in_bytes (elt_type);
1737 size = size_binop (MULT_EXPR, size, convert (sizetype, nelts));
1742 /* Do our own VLA layout. Setting TYPE_SIZE/_UNIT is
1743 necessary in order for the <INIT_EXPR <*foo> <CONSTRUCTOR
1744 ...>> to be valid. */
1745 TYPE_SIZE_UNIT (full_type) = size;
1746 n = convert (bitsizetype, nelts);
1747 bitsize = size_binop (MULT_EXPR, TYPE_SIZE (elt_type), n);
1748 TYPE_SIZE (full_type) = bitsize;
1752 alloc_fn = NULL_TREE;
1754 /* If PLACEMENT is a simple pointer type, then copy it into
1756 if (processing_template_decl
1757 || placement == NULL_TREE
1758 || TREE_CHAIN (placement) != NULL_TREE
1759 || TREE_CODE (TREE_TYPE (TREE_VALUE (placement))) != POINTER_TYPE)
1760 placement_var = NULL_TREE;
1763 placement_var = get_temp_regvar (TREE_TYPE (TREE_VALUE (placement)),
1764 TREE_VALUE (placement));
1765 placement = tree_cons (NULL_TREE, placement_var, NULL_TREE);
1768 /* Allocate the object. */
1769 if (! placement && TYPE_FOR_JAVA (elt_type))
1772 tree class_decl = build_java_class_ref (elt_type);
1773 static const char alloc_name[] = "_Jv_AllocObject";
1775 if (class_decl == error_mark_node)
1776 return error_mark_node;
1779 if (!get_global_value_if_present (get_identifier (alloc_name),
1782 error ("call to Java constructor with %qs undefined", alloc_name);
1783 return error_mark_node;
1785 else if (really_overloaded_fn (alloc_fn))
1787 error ("%qD should never be overloaded", alloc_fn);
1788 return error_mark_node;
1790 alloc_fn = OVL_CURRENT (alloc_fn);
1791 class_addr = build1 (ADDR_EXPR, jclass_node, class_decl);
1792 alloc_call = (build_function_call
1794 build_tree_list (NULL_TREE, class_addr)));
1801 fnname = ansi_opname (array_p ? VEC_NEW_EXPR : NEW_EXPR);
1803 if (!globally_qualified_p
1804 && CLASS_TYPE_P (elt_type)
1806 ? TYPE_HAS_ARRAY_NEW_OPERATOR (elt_type)
1807 : TYPE_HAS_NEW_OPERATOR (elt_type)))
1809 /* Use a class-specific operator new. */
1810 /* If a cookie is required, add some extra space. */
1811 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1813 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1814 size = size_binop (PLUS_EXPR, size, cookie_size);
1816 /* Create the argument list. */
1817 args = tree_cons (NULL_TREE, size, placement);
1818 /* Do name-lookup to find the appropriate operator. */
1819 fns = lookup_fnfields (elt_type, fnname, /*protect=*/2);
1820 if (fns == NULL_TREE)
1822 error ("no suitable %qD found in class %qT", fnname, elt_type);
1823 return error_mark_node;
1825 if (TREE_CODE (fns) == TREE_LIST)
1827 error ("request for member %qD is ambiguous", fnname);
1828 print_candidates (fns);
1829 return error_mark_node;
1831 alloc_call = build_new_method_call (build_dummy_object (elt_type),
1833 /*conversion_path=*/NULL_TREE,
1839 /* Use a global operator new. */
1840 /* See if a cookie might be required. */
1841 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1842 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1844 cookie_size = NULL_TREE;
1846 alloc_call = build_operator_new_call (fnname, placement,
1847 &size, &cookie_size,
1852 if (alloc_call == error_mark_node)
1853 return error_mark_node;
1855 gcc_assert (alloc_fn != NULL_TREE);
1857 /* In the simple case, we can stop now. */
1858 pointer_type = build_pointer_type (type);
1859 if (!cookie_size && !is_initialized)
1861 rval = build_nop (pointer_type, alloc_call);
1862 if (placement != NULL)
1863 rval = avoid_placement_new_aliasing (rval, placement_var);
1867 /* While we're working, use a pointer to the type we've actually
1868 allocated. Store the result of the call in a variable so that we
1869 can use it more than once. */
1870 full_pointer_type = build_pointer_type (full_type);
1871 alloc_expr = get_target_expr (build_nop (full_pointer_type, alloc_call));
1872 alloc_node = TARGET_EXPR_SLOT (alloc_expr);
1874 /* Strip any COMPOUND_EXPRs from ALLOC_CALL. */
1875 while (TREE_CODE (alloc_call) == COMPOUND_EXPR)
1876 alloc_call = TREE_OPERAND (alloc_call, 1);
1878 /* Now, check to see if this function is actually a placement
1879 allocation function. This can happen even when PLACEMENT is NULL
1880 because we might have something like:
1882 struct S { void* operator new (size_t, int i = 0); };
1884 A call to `new S' will get this allocation function, even though
1885 there is no explicit placement argument. If there is more than
1886 one argument, or there are variable arguments, then this is a
1887 placement allocation function. */
1888 placement_allocation_fn_p
1889 = (type_num_arguments (TREE_TYPE (alloc_fn)) > 1
1890 || varargs_function_p (alloc_fn));
1892 /* Preevaluate the placement args so that we don't reevaluate them for a
1893 placement delete. */
1894 if (placement_allocation_fn_p)
1897 stabilize_call (alloc_call, &inits);
1899 alloc_expr = build2 (COMPOUND_EXPR, TREE_TYPE (alloc_expr), inits,
1903 /* unless an allocation function is declared with an empty excep-
1904 tion-specification (_except.spec_), throw(), it indicates failure to
1905 allocate storage by throwing a bad_alloc exception (clause _except_,
1906 _lib.bad.alloc_); it returns a non-null pointer otherwise If the allo-
1907 cation function is declared with an empty exception-specification,
1908 throw(), it returns null to indicate failure to allocate storage and a
1909 non-null pointer otherwise.
1911 So check for a null exception spec on the op new we just called. */
1913 nothrow = TYPE_NOTHROW_P (TREE_TYPE (alloc_fn));
1914 check_new = (flag_check_new || nothrow) && ! use_java_new;
1921 /* Adjust so we're pointing to the start of the object. */
1922 data_addr = get_target_expr (build2 (POINTER_PLUS_EXPR, full_pointer_type,
1923 alloc_node, cookie_size));
1925 /* Store the number of bytes allocated so that we can know how
1926 many elements to destroy later. We use the last sizeof
1927 (size_t) bytes to store the number of elements. */
1928 cookie_ptr = fold_build1 (NEGATE_EXPR, sizetype, size_in_bytes (sizetype));
1929 cookie_ptr = build2 (POINTER_PLUS_EXPR, build_pointer_type (sizetype),
1930 data_addr, cookie_ptr);
1931 cookie = build_indirect_ref (cookie_ptr, NULL);
1933 cookie_expr = build2 (MODIFY_EXPR, sizetype, cookie, nelts);
1935 if (targetm.cxx.cookie_has_size ())
1937 /* Also store the element size. */
1938 cookie_ptr = build2 (MINUS_EXPR, build_pointer_type (sizetype),
1939 cookie_ptr, size_in_bytes (sizetype));
1940 cookie = build_indirect_ref (cookie_ptr, NULL);
1941 cookie = build2 (MODIFY_EXPR, sizetype, cookie,
1942 size_in_bytes(elt_type));
1943 cookie_expr = build2 (COMPOUND_EXPR, TREE_TYPE (cookie_expr),
1944 cookie, cookie_expr);
1946 data_addr = TARGET_EXPR_SLOT (data_addr);
1950 cookie_expr = NULL_TREE;
1951 data_addr = alloc_node;
1954 /* Now initialize the allocated object. Note that we preevaluate the
1955 initialization expression, apart from the actual constructor call or
1956 assignment--we do this because we want to delay the allocation as long
1957 as possible in order to minimize the size of the exception region for
1958 placement delete. */
1963 init_expr = build_indirect_ref (data_addr, NULL);
1967 bool explicit_default_init_p = false;
1969 if (init == void_zero_node)
1972 explicit_default_init_p = true;
1975 pedwarn ("ISO C++ forbids initialization in array new");
1978 = build_vec_init (init_expr,
1979 cp_build_binary_op (MINUS_EXPR, outer_nelts,
1982 explicit_default_init_p,
1985 /* An array initialization is stable because the initialization
1986 of each element is a full-expression, so the temporaries don't
1992 if (init == void_zero_node)
1993 init = build_default_init (full_type, nelts);
1995 if (TYPE_NEEDS_CONSTRUCTING (type))
1997 init_expr = build_special_member_call (init_expr,
1998 complete_ctor_identifier,
2001 stable = stabilize_init (init_expr, &init_preeval_expr);
2005 /* We are processing something like `new int (10)', which
2006 means allocate an int, and initialize it with 10. */
2008 if (TREE_CODE (init) == TREE_LIST)
2009 init = build_x_compound_expr_from_list (init,
2012 gcc_assert (TREE_CODE (init) != CONSTRUCTOR
2013 || TREE_TYPE (init) != NULL_TREE);
2015 init_expr = build_modify_expr (init_expr, INIT_EXPR, init);
2016 stable = stabilize_init (init_expr, &init_preeval_expr);
2020 if (init_expr == error_mark_node)
2021 return error_mark_node;
2023 /* If any part of the object initialization terminates by throwing an
2024 exception and a suitable deallocation function can be found, the
2025 deallocation function is called to free the memory in which the
2026 object was being constructed, after which the exception continues
2027 to propagate in the context of the new-expression. If no
2028 unambiguous matching deallocation function can be found,
2029 propagating the exception does not cause the object's memory to be
2031 if (flag_exceptions && ! use_java_new)
2033 enum tree_code dcode = array_p ? VEC_DELETE_EXPR : DELETE_EXPR;
2036 /* The Standard is unclear here, but the right thing to do
2037 is to use the same method for finding deallocation
2038 functions that we use for finding allocation functions. */
2039 cleanup = build_op_delete_call (dcode, alloc_node, size,
2040 globally_qualified_p,
2041 (placement_allocation_fn_p
2042 ? alloc_call : NULL_TREE),
2043 (placement_allocation_fn_p
2044 ? alloc_fn : NULL_TREE));
2049 /* This is much simpler if we were able to preevaluate all of
2050 the arguments to the constructor call. */
2051 init_expr = build2 (TRY_CATCH_EXPR, void_type_node,
2052 init_expr, cleanup);
2054 /* Ack! First we allocate the memory. Then we set our sentry
2055 variable to true, and expand a cleanup that deletes the
2056 memory if sentry is true. Then we run the constructor, and
2057 finally clear the sentry.
2059 We need to do this because we allocate the space first, so
2060 if there are any temporaries with cleanups in the
2061 constructor args and we weren't able to preevaluate them, we
2062 need this EH region to extend until end of full-expression
2063 to preserve nesting. */
2065 tree end, sentry, begin;
2067 begin = get_target_expr (boolean_true_node);
2068 CLEANUP_EH_ONLY (begin) = 1;
2070 sentry = TARGET_EXPR_SLOT (begin);
2072 TARGET_EXPR_CLEANUP (begin)
2073 = build3 (COND_EXPR, void_type_node, sentry,
2074 cleanup, void_zero_node);
2076 end = build2 (MODIFY_EXPR, TREE_TYPE (sentry),
2077 sentry, boolean_false_node);
2080 = build2 (COMPOUND_EXPR, void_type_node, begin,
2081 build2 (COMPOUND_EXPR, void_type_node, init_expr,
2088 init_expr = NULL_TREE;
2090 /* Now build up the return value in reverse order. */
2095 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_expr, rval);
2097 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), cookie_expr, rval);
2099 if (rval == alloc_node)
2100 /* If we don't have an initializer or a cookie, strip the TARGET_EXPR
2101 and return the call (which doesn't need to be adjusted). */
2102 rval = TARGET_EXPR_INITIAL (alloc_expr);
2107 tree ifexp = cp_build_binary_op (NE_EXPR, alloc_node,
2109 rval = build_conditional_expr (ifexp, rval, alloc_node);
2112 /* Perform the allocation before anything else, so that ALLOC_NODE
2113 has been initialized before we start using it. */
2114 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), alloc_expr, rval);
2117 if (init_preeval_expr)
2118 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_preeval_expr, rval);
2120 /* Convert to the final type. */
2121 rval = build_nop (pointer_type, rval);
2123 /* A new-expression is never an lvalue. */
2124 gcc_assert (!lvalue_p (rval));
2126 if (placement != NULL)
2127 rval = avoid_placement_new_aliasing (rval, placement_var);
2132 /* Generate a representation for a C++ "new" expression. PLACEMENT is
2133 a TREE_LIST of placement-new arguments (or NULL_TREE if none). If
2134 NELTS is NULL, TYPE is the type of the storage to be allocated. If
2135 NELTS is not NULL, then this is an array-new allocation; TYPE is
2136 the type of the elements in the array and NELTS is the number of
2137 elements in the array. INIT, if non-NULL, is the initializer for
2138 the new object, or void_zero_node to indicate an initializer of
2139 "()". If USE_GLOBAL_NEW is true, then the user explicitly wrote
2140 "::new" rather than just "new". */
2143 build_new (tree placement, tree type, tree nelts, tree init,
2147 tree orig_placement;
2151 if (placement == error_mark_node || type == error_mark_node
2152 || init == error_mark_node)
2153 return error_mark_node;
2155 orig_placement = placement;
2159 if (processing_template_decl)
2161 if (dependent_type_p (type)
2162 || any_type_dependent_arguments_p (placement)
2163 || (nelts && type_dependent_expression_p (nelts))
2164 || (init != void_zero_node
2165 && any_type_dependent_arguments_p (init)))
2166 return build_raw_new_expr (placement, type, nelts, init,
2168 placement = build_non_dependent_args (placement);
2170 nelts = build_non_dependent_expr (nelts);
2171 if (init != void_zero_node)
2172 init = build_non_dependent_args (init);
2177 if (!build_expr_type_conversion (WANT_INT | WANT_ENUM, nelts, false))
2178 pedwarn ("size in array new must have integral type");
2179 nelts = cp_save_expr (cp_convert (sizetype, nelts));
2180 /* It is valid to allocate a zero-element array:
2184 When the value of the expression in a direct-new-declarator
2185 is zero, the allocation function is called to allocate an
2186 array with no elements. The pointer returned by the
2187 new-expression is non-null. [Note: If the library allocation
2188 function is called, the pointer returned is distinct from the
2189 pointer to any other object.]
2191 However, that is not generally useful, so we issue a
2193 if (integer_zerop (nelts))
2194 warning (0, "allocating zero-element array");
2197 /* ``A reference cannot be created by the new operator. A reference
2198 is not an object (8.2.2, 8.4.3), so a pointer to it could not be
2199 returned by new.'' ARM 5.3.3 */
2200 if (TREE_CODE (type) == REFERENCE_TYPE)
2202 error ("new cannot be applied to a reference type");
2203 type = TREE_TYPE (type);
2206 if (TREE_CODE (type) == FUNCTION_TYPE)
2208 error ("new cannot be applied to a function type");
2209 return error_mark_node;
2212 rval = build_new_1 (placement, type, nelts, init, use_global_new);
2213 if (rval == error_mark_node)
2214 return error_mark_node;
2216 if (processing_template_decl)
2217 return build_raw_new_expr (orig_placement, type, orig_nelts, orig_init,
2220 /* Wrap it in a NOP_EXPR so warn_if_unused_value doesn't complain. */
2221 rval = build1 (NOP_EXPR, TREE_TYPE (rval), rval);
2222 TREE_NO_WARNING (rval) = 1;
2227 /* Given a Java class, return a decl for the corresponding java.lang.Class. */
2230 build_java_class_ref (tree type)
2232 tree name = NULL_TREE, class_decl;
2233 static tree CL_suffix = NULL_TREE;
2234 if (CL_suffix == NULL_TREE)
2235 CL_suffix = get_identifier("class$");
2236 if (jclass_node == NULL_TREE)
2238 jclass_node = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
2239 if (jclass_node == NULL_TREE)
2241 error ("call to Java constructor, while %<jclass%> undefined");
2242 return error_mark_node;
2244 jclass_node = TREE_TYPE (jclass_node);
2247 /* Mangle the class$ field. */
2250 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
2251 if (DECL_NAME (field) == CL_suffix)
2253 mangle_decl (field);
2254 name = DECL_ASSEMBLER_NAME (field);
2259 error ("can't find %<class$%> in %qT", type);
2260 return error_mark_node;
2264 class_decl = IDENTIFIER_GLOBAL_VALUE (name);
2265 if (class_decl == NULL_TREE)
2267 class_decl = build_decl (VAR_DECL, name, TREE_TYPE (jclass_node));
2268 TREE_STATIC (class_decl) = 1;
2269 DECL_EXTERNAL (class_decl) = 1;
2270 TREE_PUBLIC (class_decl) = 1;
2271 DECL_ARTIFICIAL (class_decl) = 1;
2272 DECL_IGNORED_P (class_decl) = 1;
2273 pushdecl_top_level (class_decl);
2274 make_decl_rtl (class_decl);
2280 build_vec_delete_1 (tree base, tree maxindex, tree type,
2281 special_function_kind auto_delete_vec, int use_global_delete)
2284 tree ptype = build_pointer_type (type = complete_type (type));
2285 tree size_exp = size_in_bytes (type);
2287 /* Temporary variables used by the loop. */
2288 tree tbase, tbase_init;
2290 /* This is the body of the loop that implements the deletion of a
2291 single element, and moves temp variables to next elements. */
2294 /* This is the LOOP_EXPR that governs the deletion of the elements. */
2297 /* This is the thing that governs what to do after the loop has run. */
2298 tree deallocate_expr = 0;
2300 /* This is the BIND_EXPR which holds the outermost iterator of the
2301 loop. It is convenient to set this variable up and test it before
2302 executing any other code in the loop.
2303 This is also the containing expression returned by this function. */
2304 tree controller = NULL_TREE;
2307 /* We should only have 1-D arrays here. */
2308 gcc_assert (TREE_CODE (type) != ARRAY_TYPE);
2310 if (! IS_AGGR_TYPE (type) || TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
2313 /* The below is short by the cookie size. */
2314 virtual_size = size_binop (MULT_EXPR, size_exp,
2315 convert (sizetype, maxindex));
2317 tbase = create_temporary_var (ptype);
2318 tbase_init = build_modify_expr (tbase, NOP_EXPR,
2319 fold_build2 (POINTER_PLUS_EXPR, ptype,
2322 DECL_REGISTER (tbase) = 1;
2323 controller = build3 (BIND_EXPR, void_type_node, tbase,
2324 NULL_TREE, NULL_TREE);
2325 TREE_SIDE_EFFECTS (controller) = 1;
2327 body = build1 (EXIT_EXPR, void_type_node,
2328 build2 (EQ_EXPR, boolean_type_node, tbase,
2329 fold_convert (ptype, base)));
2330 tmp = fold_build1 (NEGATE_EXPR, sizetype, size_exp);
2331 body = build_compound_expr
2332 (body, build_modify_expr (tbase, NOP_EXPR,
2333 build2 (POINTER_PLUS_EXPR, ptype, tbase, tmp)));
2334 body = build_compound_expr
2335 (body, build_delete (ptype, tbase, sfk_complete_destructor,
2336 LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 1));
2338 loop = build1 (LOOP_EXPR, void_type_node, body);
2339 loop = build_compound_expr (tbase_init, loop);
2342 /* If the delete flag is one, or anything else with the low bit set,
2343 delete the storage. */
2344 if (auto_delete_vec != sfk_base_destructor)
2348 /* The below is short by the cookie size. */
2349 virtual_size = size_binop (MULT_EXPR, size_exp,
2350 convert (sizetype, maxindex));
2352 if (! TYPE_VEC_NEW_USES_COOKIE (type))
2359 cookie_size = targetm.cxx.get_cookie_size (type);
2361 = cp_convert (ptype,
2362 cp_build_binary_op (MINUS_EXPR,
2363 cp_convert (string_type_node,
2366 /* True size with header. */
2367 virtual_size = size_binop (PLUS_EXPR, virtual_size, cookie_size);
2370 if (auto_delete_vec == sfk_deleting_destructor)
2371 deallocate_expr = build_op_delete_call (VEC_DELETE_EXPR,
2372 base_tbd, virtual_size,
2373 use_global_delete & 1,
2374 /*placement=*/NULL_TREE,
2375 /*alloc_fn=*/NULL_TREE);
2379 if (!deallocate_expr)
2382 body = deallocate_expr;
2384 body = build_compound_expr (body, deallocate_expr);
2387 body = integer_zero_node;
2389 /* Outermost wrapper: If pointer is null, punt. */
2390 body = fold_build3 (COND_EXPR, void_type_node,
2391 fold_build2 (NE_EXPR, boolean_type_node, base,
2392 convert (TREE_TYPE (base),
2393 integer_zero_node)),
2394 body, integer_zero_node);
2395 body = build1 (NOP_EXPR, void_type_node, body);
2399 TREE_OPERAND (controller, 1) = body;
2403 if (TREE_CODE (base) == SAVE_EXPR)
2404 /* Pre-evaluate the SAVE_EXPR outside of the BIND_EXPR. */
2405 body = build2 (COMPOUND_EXPR, void_type_node, base, body);
2407 return convert_to_void (body, /*implicit=*/NULL);
2410 /* Create an unnamed variable of the indicated TYPE. */
2413 create_temporary_var (tree type)
2417 decl = build_decl (VAR_DECL, NULL_TREE, type);
2418 TREE_USED (decl) = 1;
2419 DECL_ARTIFICIAL (decl) = 1;
2420 DECL_IGNORED_P (decl) = 1;
2421 DECL_SOURCE_LOCATION (decl) = input_location;
2422 DECL_CONTEXT (decl) = current_function_decl;
2427 /* Create a new temporary variable of the indicated TYPE, initialized
2430 It is not entered into current_binding_level, because that breaks
2431 things when it comes time to do final cleanups (which take place
2432 "outside" the binding contour of the function). */
2435 get_temp_regvar (tree type, tree init)
2439 decl = create_temporary_var (type);
2440 add_decl_expr (decl);
2442 finish_expr_stmt (build_modify_expr (decl, INIT_EXPR, init));
2447 /* `build_vec_init' returns tree structure that performs
2448 initialization of a vector of aggregate types.
2450 BASE is a reference to the vector, of ARRAY_TYPE.
2451 MAXINDEX is the maximum index of the array (one less than the
2452 number of elements). It is only used if
2453 TYPE_DOMAIN (TREE_TYPE (BASE)) == NULL_TREE.
2455 INIT is the (possibly NULL) initializer.
2457 If EXPLICIT_DEFAULT_INIT_P is true, then INIT must be NULL. All
2458 elements in the array are default-initialized.
2460 FROM_ARRAY is 0 if we should init everything with INIT
2461 (i.e., every element initialized from INIT).
2462 FROM_ARRAY is 1 if we should index into INIT in parallel
2463 with initialization of DECL.
2464 FROM_ARRAY is 2 if we should index into INIT in parallel,
2465 but use assignment instead of initialization. */
2468 build_vec_init (tree base, tree maxindex, tree init,
2469 bool explicit_default_init_p,
2473 tree base2 = NULL_TREE;
2475 tree itype = NULL_TREE;
2477 /* The type of the array. */
2478 tree atype = TREE_TYPE (base);
2479 /* The type of an element in the array. */
2480 tree type = TREE_TYPE (atype);
2481 /* The element type reached after removing all outer array
2483 tree inner_elt_type;
2484 /* The type of a pointer to an element in the array. */
2489 tree try_block = NULL_TREE;
2490 int num_initialized_elts = 0;
2493 if (TYPE_DOMAIN (atype))
2494 maxindex = array_type_nelts (atype);
2496 if (maxindex == NULL_TREE || maxindex == error_mark_node)
2497 return error_mark_node;
2499 if (explicit_default_init_p)
2502 inner_elt_type = strip_array_types (atype);
2505 ? (!CLASS_TYPE_P (inner_elt_type)
2506 || !TYPE_HAS_COMPLEX_ASSIGN_REF (inner_elt_type))
2507 : !TYPE_NEEDS_CONSTRUCTING (type))
2508 && ((TREE_CODE (init) == CONSTRUCTOR
2509 /* Don't do this if the CONSTRUCTOR might contain something
2510 that might throw and require us to clean up. */
2511 && (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init))
2512 || ! TYPE_HAS_NONTRIVIAL_DESTRUCTOR (inner_elt_type)))
2515 /* Do non-default initialization of POD arrays resulting from
2516 brace-enclosed initializers. In this case, digest_init and
2517 store_constructor will handle the semantics for us. */
2519 stmt_expr = build2 (INIT_EXPR, atype, base, init);
2523 maxindex = cp_convert (ptrdiff_type_node, maxindex);
2524 ptype = build_pointer_type (type);
2525 size = size_in_bytes (type);
2526 if (TREE_CODE (TREE_TYPE (base)) == ARRAY_TYPE)
2527 base = cp_convert (ptype, decay_conversion (base));
2529 /* The code we are generating looks like:
2533 ptrdiff_t iterator = maxindex;
2535 for (; iterator != -1; --iterator) {
2536 ... initialize *t1 ...
2540 ... destroy elements that were constructed ...
2545 We can omit the try and catch blocks if we know that the
2546 initialization will never throw an exception, or if the array
2547 elements do not have destructors. We can omit the loop completely if
2548 the elements of the array do not have constructors.
2550 We actually wrap the entire body of the above in a STMT_EXPR, for
2553 When copying from array to another, when the array elements have
2554 only trivial copy constructors, we should use __builtin_memcpy
2555 rather than generating a loop. That way, we could take advantage
2556 of whatever cleverness the back end has for dealing with copies
2557 of blocks of memory. */
2559 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
2560 destroy_temps = stmts_are_full_exprs_p ();
2561 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2562 rval = get_temp_regvar (ptype, base);
2563 base = get_temp_regvar (ptype, rval);
2564 iterator = get_temp_regvar (ptrdiff_type_node, maxindex);
2566 /* Protect the entire array initialization so that we can destroy
2567 the partially constructed array if an exception is thrown.
2568 But don't do this if we're assigning. */
2569 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2572 try_block = begin_try_block ();
2575 if (init != NULL_TREE && TREE_CODE (init) == CONSTRUCTOR)
2577 /* Do non-default initialization of non-POD arrays resulting from
2578 brace-enclosed initializers. */
2579 unsigned HOST_WIDE_INT idx;
2583 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init), idx, elt)
2585 tree baseref = build1 (INDIRECT_REF, type, base);
2587 num_initialized_elts++;
2589 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2590 if (IS_AGGR_TYPE (type) || TREE_CODE (type) == ARRAY_TYPE)
2591 finish_expr_stmt (build_aggr_init (baseref, elt, 0));
2593 finish_expr_stmt (build_modify_expr (baseref, NOP_EXPR,
2595 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2597 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base, 0));
2598 finish_expr_stmt (build_unary_op (PREDECREMENT_EXPR, iterator, 0));
2601 /* Clear out INIT so that we don't get confused below. */
2604 else if (from_array)
2606 /* If initializing one array from another, initialize element by
2607 element. We rely upon the below calls the do argument
2611 base2 = decay_conversion (init);
2612 itype = TREE_TYPE (base2);
2613 base2 = get_temp_regvar (itype, base2);
2614 itype = TREE_TYPE (itype);
2616 else if (TYPE_LANG_SPECIFIC (type)
2617 && TYPE_NEEDS_CONSTRUCTING (type)
2618 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
2620 error ("initializer ends prematurely");
2621 return error_mark_node;
2625 /* Now, default-initialize any remaining elements. We don't need to
2626 do that if a) the type does not need constructing, or b) we've
2627 already initialized all the elements.
2629 We do need to keep going if we're copying an array. */
2632 || ((TYPE_NEEDS_CONSTRUCTING (type) || explicit_default_init_p)
2633 && ! (host_integerp (maxindex, 0)
2634 && (num_initialized_elts
2635 == tree_low_cst (maxindex, 0) + 1))))
2637 /* If the ITERATOR is equal to -1, then we don't have to loop;
2638 we've already initialized all the elements. */
2643 for_stmt = begin_for_stmt ();
2644 finish_for_init_stmt (for_stmt);
2645 finish_for_cond (build2 (NE_EXPR, boolean_type_node, iterator,
2646 build_int_cst (TREE_TYPE (iterator), -1)),
2648 finish_for_expr (build_unary_op (PREDECREMENT_EXPR, iterator, 0),
2651 to = build1 (INDIRECT_REF, type, base);
2658 from = build1 (INDIRECT_REF, itype, base2);
2662 if (from_array == 2)
2663 elt_init = build_modify_expr (to, NOP_EXPR, from);
2664 else if (TYPE_NEEDS_CONSTRUCTING (type))
2665 elt_init = build_aggr_init (to, from, 0);
2667 elt_init = build_modify_expr (to, NOP_EXPR, from);
2671 else if (TREE_CODE (type) == ARRAY_TYPE)
2675 ("cannot initialize multi-dimensional array with initializer");
2676 elt_init = build_vec_init (build1 (INDIRECT_REF, type, base),
2678 /*explicit_default_init_p=*/false,
2681 else if (!TYPE_NEEDS_CONSTRUCTING (type))
2682 elt_init = (build_modify_expr
2684 build_zero_init (type, size_one_node,
2685 /*static_storage_p=*/false)));
2687 elt_init = build_aggr_init (to, init, 0);
2689 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2690 finish_expr_stmt (elt_init);
2691 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2693 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base, 0));
2695 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base2, 0));
2697 finish_for_stmt (for_stmt);
2700 /* Make sure to cleanup any partially constructed elements. */
2701 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2705 tree m = cp_build_binary_op (MINUS_EXPR, maxindex, iterator);
2707 /* Flatten multi-dimensional array since build_vec_delete only
2708 expects one-dimensional array. */
2709 if (TREE_CODE (type) == ARRAY_TYPE)
2710 m = cp_build_binary_op (MULT_EXPR, m,
2711 array_type_nelts_total (type));
2713 finish_cleanup_try_block (try_block);
2714 e = build_vec_delete_1 (rval, m,
2715 inner_elt_type, sfk_base_destructor,
2716 /*use_global_delete=*/0);
2717 finish_cleanup (e, try_block);
2720 /* The value of the array initialization is the array itself, RVAL
2721 is a pointer to the first element. */
2722 finish_stmt_expr_expr (rval, stmt_expr);
2724 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
2726 /* Now convert make the result have the correct type. */
2727 atype = build_pointer_type (atype);
2728 stmt_expr = build1 (NOP_EXPR, atype, stmt_expr);
2729 stmt_expr = build_indirect_ref (stmt_expr, NULL);
2731 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
2735 /* Call the DTOR_KIND destructor for EXP. FLAGS are as for
2739 build_dtor_call (tree exp, special_function_kind dtor_kind, int flags)
2745 case sfk_complete_destructor:
2746 name = complete_dtor_identifier;
2749 case sfk_base_destructor:
2750 name = base_dtor_identifier;
2753 case sfk_deleting_destructor:
2754 name = deleting_dtor_identifier;
2760 fn = lookup_fnfields (TREE_TYPE (exp), name, /*protect=*/2);
2761 return build_new_method_call (exp, fn,
2763 /*conversion_path=*/NULL_TREE,
2768 /* Generate a call to a destructor. TYPE is the type to cast ADDR to.
2769 ADDR is an expression which yields the store to be destroyed.
2770 AUTO_DELETE is the name of the destructor to call, i.e., either
2771 sfk_complete_destructor, sfk_base_destructor, or
2772 sfk_deleting_destructor.
2774 FLAGS is the logical disjunction of zero or more LOOKUP_
2775 flags. See cp-tree.h for more info. */
2778 build_delete (tree type, tree addr, special_function_kind auto_delete,
2779 int flags, int use_global_delete)
2783 if (addr == error_mark_node)
2784 return error_mark_node;
2786 /* Can happen when CURRENT_EXCEPTION_OBJECT gets its type
2787 set to `error_mark_node' before it gets properly cleaned up. */
2788 if (type == error_mark_node)
2789 return error_mark_node;
2791 type = TYPE_MAIN_VARIANT (type);
2793 if (TREE_CODE (type) == POINTER_TYPE)
2795 bool complete_p = true;
2797 type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
2798 if (TREE_CODE (type) == ARRAY_TYPE)
2801 /* We don't want to warn about delete of void*, only other
2802 incomplete types. Deleting other incomplete types
2803 invokes undefined behavior, but it is not ill-formed, so
2804 compile to something that would even do The Right Thing
2805 (TM) should the type have a trivial dtor and no delete
2807 if (!VOID_TYPE_P (type))
2809 complete_type (type);
2810 if (!COMPLETE_TYPE_P (type))
2812 warning (0, "possible problem detected in invocation of "
2813 "delete operator:");
2814 cxx_incomplete_type_diagnostic (addr, type, 1);
2815 inform ("neither the destructor nor the class-specific "
2816 "operator delete will be called, even if they are "
2817 "declared when the class is defined.");
2821 if (VOID_TYPE_P (type) || !complete_p || !IS_AGGR_TYPE (type))
2822 /* Call the builtin operator delete. */
2823 return build_builtin_delete_call (addr);
2824 if (TREE_SIDE_EFFECTS (addr))
2825 addr = save_expr (addr);
2827 /* Throw away const and volatile on target type of addr. */
2828 addr = convert_force (build_pointer_type (type), addr, 0);
2830 else if (TREE_CODE (type) == ARRAY_TYPE)
2834 if (TYPE_DOMAIN (type) == NULL_TREE)
2836 error ("unknown array size in delete");
2837 return error_mark_node;
2839 return build_vec_delete (addr, array_type_nelts (type),
2840 auto_delete, use_global_delete);
2844 /* Don't check PROTECT here; leave that decision to the
2845 destructor. If the destructor is accessible, call it,
2846 else report error. */
2847 addr = build_unary_op (ADDR_EXPR, addr, 0);
2848 if (TREE_SIDE_EFFECTS (addr))
2849 addr = save_expr (addr);
2851 addr = convert_force (build_pointer_type (type), addr, 0);
2854 gcc_assert (IS_AGGR_TYPE (type));
2856 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
2858 if (auto_delete != sfk_deleting_destructor)
2859 return void_zero_node;
2861 return build_op_delete_call (DELETE_EXPR, addr,
2862 cxx_sizeof_nowarn (type),
2864 /*placement=*/NULL_TREE,
2865 /*alloc_fn=*/NULL_TREE);
2869 tree do_delete = NULL_TREE;
2872 if (CLASSTYPE_LAZY_DESTRUCTOR (type))
2873 lazily_declare_fn (sfk_destructor, type);
2875 /* For `::delete x', we must not use the deleting destructor
2876 since then we would not be sure to get the global `operator
2878 if (use_global_delete && auto_delete == sfk_deleting_destructor)
2880 /* We will use ADDR multiple times so we must save it. */
2881 addr = save_expr (addr);
2882 /* Delete the object. */
2883 do_delete = build_builtin_delete_call (addr);
2884 /* Otherwise, treat this like a complete object destructor
2886 auto_delete = sfk_complete_destructor;
2888 /* If the destructor is non-virtual, there is no deleting
2889 variant. Instead, we must explicitly call the appropriate
2890 `operator delete' here. */
2891 else if (!DECL_VIRTUAL_P (CLASSTYPE_DESTRUCTORS (type))
2892 && auto_delete == sfk_deleting_destructor)
2894 /* We will use ADDR multiple times so we must save it. */
2895 addr = save_expr (addr);
2896 /* Build the call. */
2897 do_delete = build_op_delete_call (DELETE_EXPR,
2899 cxx_sizeof_nowarn (type),
2901 /*placement=*/NULL_TREE,
2902 /*alloc_fn=*/NULL_TREE);
2903 /* Call the complete object destructor. */
2904 auto_delete = sfk_complete_destructor;
2906 else if (auto_delete == sfk_deleting_destructor
2907 && TYPE_GETS_REG_DELETE (type))
2909 /* Make sure we have access to the member op delete, even though
2910 we'll actually be calling it from the destructor. */
2911 build_op_delete_call (DELETE_EXPR, addr, cxx_sizeof_nowarn (type),
2913 /*placement=*/NULL_TREE,
2914 /*alloc_fn=*/NULL_TREE);
2917 expr = build_dtor_call (build_indirect_ref (addr, NULL),
2918 auto_delete, flags);
2920 expr = build2 (COMPOUND_EXPR, void_type_node, expr, do_delete);
2922 if (flags & LOOKUP_DESTRUCTOR)
2923 /* Explicit destructor call; don't check for null pointer. */
2924 ifexp = integer_one_node;
2926 /* Handle deleting a null pointer. */
2927 ifexp = fold (cp_build_binary_op (NE_EXPR, addr, integer_zero_node));
2929 if (ifexp != integer_one_node)
2930 expr = build3 (COND_EXPR, void_type_node,
2931 ifexp, expr, void_zero_node);
2937 /* At the beginning of a destructor, push cleanups that will call the
2938 destructors for our base classes and members.
2940 Called from begin_destructor_body. */
2943 push_base_cleanups (void)
2945 tree binfo, base_binfo;
2949 VEC(tree,gc) *vbases;
2951 /* Run destructors for all virtual baseclasses. */
2952 if (CLASSTYPE_VBASECLASSES (current_class_type))
2954 tree cond = (condition_conversion
2955 (build2 (BIT_AND_EXPR, integer_type_node,
2956 current_in_charge_parm,
2957 integer_two_node)));
2959 /* The CLASSTYPE_VBASECLASSES vector is in initialization
2960 order, which is also the right order for pushing cleanups. */
2961 for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;
2962 VEC_iterate (tree, vbases, i, base_binfo); i++)
2964 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo)))
2966 expr = build_special_member_call (current_class_ref,
2967 base_dtor_identifier,
2971 | LOOKUP_NONVIRTUAL));
2972 expr = build3 (COND_EXPR, void_type_node, cond,
2973 expr, void_zero_node);
2974 finish_decl_cleanup (NULL_TREE, expr);
2979 /* Take care of the remaining baseclasses. */
2980 for (binfo = TYPE_BINFO (current_class_type), i = 0;
2981 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
2983 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo))
2984 || BINFO_VIRTUAL_P (base_binfo))
2987 expr = build_special_member_call (current_class_ref,
2988 base_dtor_identifier,
2989 NULL_TREE, base_binfo,
2990 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL);
2991 finish_decl_cleanup (NULL_TREE, expr);
2994 for (member = TYPE_FIELDS (current_class_type); member;
2995 member = TREE_CHAIN (member))
2997 if (TREE_TYPE (member) == error_mark_node
2998 || TREE_CODE (member) != FIELD_DECL
2999 || DECL_ARTIFICIAL (member))
3001 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (member)))
3003 tree this_member = (build_class_member_access_expr
3004 (current_class_ref, member,
3005 /*access_path=*/NULL_TREE,
3006 /*preserve_reference=*/false));
3007 tree this_type = TREE_TYPE (member);
3008 expr = build_delete (this_type, this_member,
3009 sfk_complete_destructor,
3010 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR|LOOKUP_NORMAL,
3012 finish_decl_cleanup (NULL_TREE, expr);
3017 /* Build a C++ vector delete expression.
3018 MAXINDEX is the number of elements to be deleted.
3019 ELT_SIZE is the nominal size of each element in the vector.
3020 BASE is the expression that should yield the store to be deleted.
3021 This function expands (or synthesizes) these calls itself.
3022 AUTO_DELETE_VEC says whether the container (vector) should be deallocated.
3024 This also calls delete for virtual baseclasses of elements of the vector.
3026 Update: MAXINDEX is no longer needed. The size can be extracted from the
3027 start of the vector for pointers, and from the type for arrays. We still
3028 use MAXINDEX for arrays because it happens to already have one of the
3029 values we'd have to extract. (We could use MAXINDEX with pointers to
3030 confirm the size, and trap if the numbers differ; not clear that it'd
3031 be worth bothering.) */
3034 build_vec_delete (tree base, tree maxindex,
3035 special_function_kind auto_delete_vec, int use_global_delete)
3039 tree base_init = NULL_TREE;
3041 type = TREE_TYPE (base);
3043 if (TREE_CODE (type) == POINTER_TYPE)
3045 /* Step back one from start of vector, and read dimension. */
3048 if (TREE_SIDE_EFFECTS (base))
3050 base_init = get_target_expr (base);
3051 base = TARGET_EXPR_SLOT (base_init);
3053 type = strip_array_types (TREE_TYPE (type));
3054 cookie_addr = fold_build1 (NEGATE_EXPR, sizetype, TYPE_SIZE_UNIT (sizetype));
3055 cookie_addr = build2 (POINTER_PLUS_EXPR,
3056 build_pointer_type (sizetype),
3059 maxindex = build_indirect_ref (cookie_addr, NULL);
3061 else if (TREE_CODE (type) == ARRAY_TYPE)
3063 /* Get the total number of things in the array, maxindex is a
3065 maxindex = array_type_nelts_total (type);
3066 type = strip_array_types (type);
3067 base = build_unary_op (ADDR_EXPR, base, 1);
3068 if (TREE_SIDE_EFFECTS (base))
3070 base_init = get_target_expr (base);
3071 base = TARGET_EXPR_SLOT (base_init);
3076 if (base != error_mark_node)
3077 error ("type to vector delete is neither pointer or array type");
3078 return error_mark_node;
3081 rval = build_vec_delete_1 (base, maxindex, type, auto_delete_vec,
3084 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), base_init, rval);