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 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
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);
43 static void expand_default_init (tree, tree, tree, tree, int);
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_default_init (tree, tree);
55 static tree build_new_1 (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))
189 /* Build a constructor to contain the initializations. */
190 init = build_constructor (type, NULL_TREE);
191 /* Iterate over the fields, building initializations. */
193 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
195 if (TREE_CODE (field) != FIELD_DECL)
198 /* Note that for class types there will be FIELD_DECLs
199 corresponding to base classes as well. Thus, iterating
200 over TYPE_FIELDs will result in correct initialization of
201 all of the subobjects. */
202 if (static_storage_p && !zero_init_p (TREE_TYPE (field)))
203 inits = tree_cons (field,
204 build_zero_init (TREE_TYPE (field),
209 /* For unions, only the first field is initialized. */
210 if (TREE_CODE (type) == UNION_TYPE)
213 CONSTRUCTOR_ELTS (init) = nreverse (inits);
215 else if (TREE_CODE (type) == ARRAY_TYPE)
221 /* Build a constructor to contain the initializations. */
222 init = build_constructor (type, NULL_TREE);
223 /* Iterate over the array elements, building initializations. */
225 max_index = nelts ? nelts : array_type_nelts (type);
226 gcc_assert (TREE_CODE (max_index) == INTEGER_CST);
228 /* A zero-sized array, which is accepted as an extension, will
229 have an upper bound of -1. */
230 if (!tree_int_cst_equal (max_index, integer_minus_one_node))
231 for (index = size_zero_node;
232 !tree_int_cst_lt (max_index, index);
233 index = size_binop (PLUS_EXPR, index, size_one_node))
234 inits = tree_cons (index,
235 build_zero_init (TREE_TYPE (type),
239 CONSTRUCTOR_ELTS (init) = nreverse (inits);
242 gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
244 /* In all cases, the initializer is a constant. */
247 TREE_CONSTANT (init) = 1;
248 TREE_INVARIANT (init) = 1;
254 /* Build an expression for the default-initialization of an object of
255 the indicated TYPE. If NELTS is non-NULL, and TYPE is an
256 ARRAY_TYPE, NELTS is the number of elements in the array. If
257 initialization of TYPE requires calling constructors, this function
258 returns NULL_TREE; the caller is responsible for arranging for the
259 constructors to be called. */
262 build_default_init (tree type, tree nelts)
266 To default-initialize an object of type T means:
268 --if T is a non-POD class type (clause _class_), the default construc-
269 tor for T is called (and the initialization is ill-formed if T has
270 no accessible default constructor);
272 --if T is an array type, each element is default-initialized;
274 --otherwise, the storage for the object is zero-initialized.
276 A program that calls for default-initialization of an entity of refer-
277 ence type is ill-formed. */
279 /* If TYPE_NEEDS_CONSTRUCTING is true, the caller is responsible for
280 performing the initialization. This is confusing in that some
281 non-PODs do not have TYPE_NEEDS_CONSTRUCTING set. (For example,
282 a class with a pointer-to-data member as a non-static data member
283 does not have TYPE_NEEDS_CONSTRUCTING set.) Therefore, we end up
284 passing non-PODs to build_zero_init below, which is contrary to
285 the semantics quoted above from [dcl.init].
287 It happens, however, that the behavior of the constructor the
288 standard says we should have generated would be precisely the
289 same as that obtained by calling build_zero_init below, so things
291 if (TYPE_NEEDS_CONSTRUCTING (type)
292 || (nelts && TREE_CODE (nelts) != INTEGER_CST))
295 /* At this point, TYPE is either a POD class type, an array of POD
296 classes, or something even more innocuous. */
297 return build_zero_init (type, nelts, /*static_storage_p=*/false);
300 /* Initialize MEMBER, a FIELD_DECL, with INIT, a TREE_LIST of
301 arguments. If TREE_LIST is void_type_node, an empty initializer
302 list was given; if NULL_TREE no initializer was given. */
305 perform_member_init (tree member, tree init)
308 tree type = TREE_TYPE (member);
311 explicit = (init != NULL_TREE);
313 /* Effective C++ rule 12 requires that all data members be
315 if (warn_ecpp && !explicit && TREE_CODE (type) != ARRAY_TYPE)
316 warning ("%J%qD should be initialized in the member initialization "
317 "list", current_function_decl, member);
319 if (init == void_type_node)
322 /* Get an lvalue for the data member. */
323 decl = build_class_member_access_expr (current_class_ref, member,
324 /*access_path=*/NULL_TREE,
325 /*preserve_reference=*/true);
326 if (decl == error_mark_node)
329 /* Deal with this here, as we will get confused if we try to call the
330 assignment op for an anonymous union. This can happen in a
331 synthesized copy constructor. */
332 if (ANON_AGGR_TYPE_P (type))
336 init = build2 (INIT_EXPR, type, decl, TREE_VALUE (init));
337 finish_expr_stmt (init);
340 else if (TYPE_NEEDS_CONSTRUCTING (type))
343 && TREE_CODE (type) == ARRAY_TYPE
345 && TREE_CHAIN (init) == NULL_TREE
346 && TREE_CODE (TREE_TYPE (TREE_VALUE (init))) == ARRAY_TYPE)
348 /* Initialization of one array from another. */
349 finish_expr_stmt (build_vec_init (decl, NULL_TREE, TREE_VALUE (init),
353 finish_expr_stmt (build_aggr_init (decl, init, 0));
357 if (init == NULL_TREE)
361 init = build_default_init (type, /*nelts=*/NULL_TREE);
362 if (TREE_CODE (type) == REFERENCE_TYPE)
363 warning ("%Jdefault-initialization of %q#D, "
364 "which has reference type",
365 current_function_decl, member);
367 /* member traversal: note it leaves init NULL */
368 else if (TREE_CODE (type) == REFERENCE_TYPE)
369 pedwarn ("%Juninitialized reference member %qD",
370 current_function_decl, member);
371 else if (CP_TYPE_CONST_P (type))
372 pedwarn ("%Juninitialized member %qD with %<const%> type %qT",
373 current_function_decl, member, type);
375 else if (TREE_CODE (init) == TREE_LIST)
376 /* There was an explicit member initialization. Do some work
378 init = build_x_compound_expr_from_list (init, "member initializer");
381 finish_expr_stmt (build_modify_expr (decl, INIT_EXPR, init));
384 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
388 expr = build_class_member_access_expr (current_class_ref, member,
389 /*access_path=*/NULL_TREE,
390 /*preserve_reference=*/false);
391 expr = build_delete (type, expr, sfk_complete_destructor,
392 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
394 if (expr != error_mark_node)
395 finish_eh_cleanup (expr);
399 /* Returns a TREE_LIST containing (as the TREE_PURPOSE of each node) all
400 the FIELD_DECLs on the TYPE_FIELDS list for T, in reverse order. */
403 build_field_list (tree t, tree list, int *uses_unions_p)
409 /* Note whether or not T is a union. */
410 if (TREE_CODE (t) == UNION_TYPE)
413 for (fields = TYPE_FIELDS (t); fields; fields = TREE_CHAIN (fields))
415 /* Skip CONST_DECLs for enumeration constants and so forth. */
416 if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields))
419 /* Keep track of whether or not any fields are unions. */
420 if (TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE)
423 /* For an anonymous struct or union, we must recursively
424 consider the fields of the anonymous type. They can be
425 directly initialized from the constructor. */
426 if (ANON_AGGR_TYPE_P (TREE_TYPE (fields)))
428 /* Add this field itself. Synthesized copy constructors
429 initialize the entire aggregate. */
430 list = tree_cons (fields, NULL_TREE, list);
431 /* And now add the fields in the anonymous aggregate. */
432 list = build_field_list (TREE_TYPE (fields), list,
435 /* Add this field. */
436 else if (DECL_NAME (fields))
437 list = tree_cons (fields, NULL_TREE, list);
443 /* The MEM_INITS are a TREE_LIST. The TREE_PURPOSE of each list gives
444 a FIELD_DECL or BINFO in T that needs initialization. The
445 TREE_VALUE gives the initializer, or list of initializer arguments.
447 Return a TREE_LIST containing all of the initializations required
448 for T, in the order in which they should be performed. The output
449 list has the same format as the input. */
452 sort_mem_initializers (tree t, tree mem_inits)
455 tree base, binfo, base_binfo;
462 /* Build up a list of initializations. The TREE_PURPOSE of entry
463 will be the subobject (a FIELD_DECL or BINFO) to initialize. The
464 TREE_VALUE will be the constructor arguments, or NULL if no
465 explicit initialization was provided. */
466 sorted_inits = NULL_TREE;
468 /* Process the virtual bases. */
469 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
470 VEC_iterate (tree, vbases, i, base); i++)
471 sorted_inits = tree_cons (base, NULL_TREE, sorted_inits);
473 /* Process the direct bases. */
474 for (binfo = TYPE_BINFO (t), i = 0;
475 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
476 if (!BINFO_VIRTUAL_P (base_binfo))
477 sorted_inits = tree_cons (base_binfo, NULL_TREE, sorted_inits);
479 /* Process the non-static data members. */
480 sorted_inits = build_field_list (t, sorted_inits, &uses_unions_p);
481 /* Reverse the entire list of initializations, so that they are in
482 the order that they will actually be performed. */
483 sorted_inits = nreverse (sorted_inits);
485 /* If the user presented the initializers in an order different from
486 that in which they will actually occur, we issue a warning. Keep
487 track of the next subobject which can be explicitly initialized
488 without issuing a warning. */
489 next_subobject = sorted_inits;
491 /* Go through the explicit initializers, filling in TREE_PURPOSE in
493 for (init = mem_inits; init; init = TREE_CHAIN (init))
498 subobject = TREE_PURPOSE (init);
500 /* If the explicit initializers are in sorted order, then
501 SUBOBJECT will be NEXT_SUBOBJECT, or something following
503 for (subobject_init = next_subobject;
505 subobject_init = TREE_CHAIN (subobject_init))
506 if (TREE_PURPOSE (subobject_init) == subobject)
509 /* Issue a warning if the explicit initializer order does not
510 match that which will actually occur.
511 ??? Are all these on the correct lines? */
512 if (warn_reorder && !subobject_init)
514 if (TREE_CODE (TREE_PURPOSE (next_subobject)) == FIELD_DECL)
515 cp_warning_at ("%qD will be initialized after",
516 TREE_PURPOSE (next_subobject));
518 warning ("base %qT will be initialized after",
519 TREE_PURPOSE (next_subobject));
520 if (TREE_CODE (subobject) == FIELD_DECL)
521 cp_warning_at (" %q#D", subobject);
523 warning (" base %qT", subobject);
524 warning ("%J when initialized here", current_function_decl);
527 /* Look again, from the beginning of the list. */
530 subobject_init = sorted_inits;
531 while (TREE_PURPOSE (subobject_init) != subobject)
532 subobject_init = TREE_CHAIN (subobject_init);
535 /* It is invalid to initialize the same subobject more than
537 if (TREE_VALUE (subobject_init))
539 if (TREE_CODE (subobject) == FIELD_DECL)
540 error ("%Jmultiple initializations given for %qD",
541 current_function_decl, subobject);
543 error ("%Jmultiple initializations given for base %qT",
544 current_function_decl, subobject);
547 /* Record the initialization. */
548 TREE_VALUE (subobject_init) = TREE_VALUE (init);
549 next_subobject = subobject_init;
554 If a ctor-initializer specifies more than one mem-initializer for
555 multiple members of the same union (including members of
556 anonymous unions), the ctor-initializer is ill-formed. */
559 tree last_field = NULL_TREE;
560 for (init = sorted_inits; init; init = TREE_CHAIN (init))
566 /* Skip uninitialized members and base classes. */
567 if (!TREE_VALUE (init)
568 || TREE_CODE (TREE_PURPOSE (init)) != FIELD_DECL)
570 /* See if this field is a member of a union, or a member of a
571 structure contained in a union, etc. */
572 field = TREE_PURPOSE (init);
573 for (field_type = DECL_CONTEXT (field);
574 !same_type_p (field_type, t);
575 field_type = TYPE_CONTEXT (field_type))
576 if (TREE_CODE (field_type) == UNION_TYPE)
578 /* If this field is not a member of a union, skip it. */
579 if (TREE_CODE (field_type) != UNION_TYPE)
582 /* It's only an error if we have two initializers for the same
590 /* See if LAST_FIELD and the field initialized by INIT are
591 members of the same union. If so, there's a problem,
592 unless they're actually members of the same structure
593 which is itself a member of a union. For example, given:
595 union { struct { int i; int j; }; };
597 initializing both `i' and `j' makes sense. */
598 field_type = DECL_CONTEXT (field);
602 tree last_field_type;
604 last_field_type = DECL_CONTEXT (last_field);
607 if (same_type_p (last_field_type, field_type))
609 if (TREE_CODE (field_type) == UNION_TYPE)
610 error ("%Jinitializations for multiple members of %qT",
611 current_function_decl, last_field_type);
616 if (same_type_p (last_field_type, t))
619 last_field_type = TYPE_CONTEXT (last_field_type);
622 /* If we've reached the outermost class, then we're
624 if (same_type_p (field_type, t))
627 field_type = TYPE_CONTEXT (field_type);
638 /* Initialize all bases and members of CURRENT_CLASS_TYPE. MEM_INITS
639 is a TREE_LIST giving the explicit mem-initializer-list for the
640 constructor. The TREE_PURPOSE of each entry is a subobject (a
641 FIELD_DECL or a BINFO) of the CURRENT_CLASS_TYPE. The TREE_VALUE
642 is a TREE_LIST giving the arguments to the constructor or
643 void_type_node for an empty list of arguments. */
646 emit_mem_initializers (tree mem_inits)
648 /* Sort the mem-initializers into the order in which the
649 initializations should be performed. */
650 mem_inits = sort_mem_initializers (current_class_type, mem_inits);
652 in_base_initializer = 1;
654 /* Initialize base classes. */
656 && TREE_CODE (TREE_PURPOSE (mem_inits)) != FIELD_DECL)
658 tree subobject = TREE_PURPOSE (mem_inits);
659 tree arguments = TREE_VALUE (mem_inits);
661 /* If these initializations are taking place in a copy
662 constructor, the base class should probably be explicitly
664 if (extra_warnings && !arguments
665 && DECL_COPY_CONSTRUCTOR_P (current_function_decl)
666 && TYPE_NEEDS_CONSTRUCTING (BINFO_TYPE (subobject)))
667 warning ("%Jbase class %q#T should be explicitly initialized in the "
669 current_function_decl, BINFO_TYPE (subobject));
671 /* If an explicit -- but empty -- initializer list was present,
672 treat it just like default initialization at this point. */
673 if (arguments == void_type_node)
674 arguments = NULL_TREE;
676 /* Initialize the base. */
677 if (BINFO_VIRTUAL_P (subobject))
678 construct_virtual_base (subobject, arguments);
683 base_addr = build_base_path (PLUS_EXPR, current_class_ptr,
685 expand_aggr_init_1 (subobject, NULL_TREE,
686 build_indirect_ref (base_addr, NULL),
689 expand_cleanup_for_base (subobject, NULL_TREE);
692 mem_inits = TREE_CHAIN (mem_inits);
694 in_base_initializer = 0;
696 /* Initialize the vptrs. */
697 initialize_vtbl_ptrs (current_class_ptr);
699 /* Initialize the data members. */
702 perform_member_init (TREE_PURPOSE (mem_inits),
703 TREE_VALUE (mem_inits));
704 mem_inits = TREE_CHAIN (mem_inits);
708 /* Returns the address of the vtable (i.e., the value that should be
709 assigned to the vptr) for BINFO. */
712 build_vtbl_address (tree binfo)
714 tree binfo_for = binfo;
717 if (BINFO_VPTR_INDEX (binfo) && BINFO_VIRTUAL_P (binfo))
718 /* If this is a virtual primary base, then the vtable we want to store
719 is that for the base this is being used as the primary base of. We
720 can't simply skip the initialization, because we may be expanding the
721 inits of a subobject constructor where the virtual base layout
723 while (BINFO_PRIMARY_P (binfo_for))
724 binfo_for = BINFO_INHERITANCE_CHAIN (binfo_for);
726 /* Figure out what vtable BINFO's vtable is based on, and mark it as
728 vtbl = get_vtbl_decl_for_binfo (binfo_for);
729 assemble_external (vtbl);
730 TREE_USED (vtbl) = 1;
732 /* Now compute the address to use when initializing the vptr. */
733 vtbl = unshare_expr (BINFO_VTABLE (binfo_for));
734 if (TREE_CODE (vtbl) == VAR_DECL)
735 vtbl = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (vtbl)), vtbl);
740 /* This code sets up the virtual function tables appropriate for
741 the pointer DECL. It is a one-ply initialization.
743 BINFO is the exact type that DECL is supposed to be. In
744 multiple inheritance, this might mean "C's A" if C : A, B. */
747 expand_virtual_init (tree binfo, tree decl)
752 /* Compute the initializer for vptr. */
753 vtbl = build_vtbl_address (binfo);
755 /* We may get this vptr from a VTT, if this is a subobject
756 constructor or subobject destructor. */
757 vtt_index = BINFO_VPTR_INDEX (binfo);
763 /* Compute the value to use, when there's a VTT. */
764 vtt_parm = current_vtt_parm;
765 vtbl2 = build2 (PLUS_EXPR,
766 TREE_TYPE (vtt_parm),
769 vtbl2 = build_indirect_ref (vtbl2, NULL);
770 vtbl2 = convert (TREE_TYPE (vtbl), vtbl2);
772 /* The actual initializer is the VTT value only in the subobject
773 constructor. In maybe_clone_body we'll substitute NULL for
774 the vtt_parm in the case of the non-subobject constructor. */
775 vtbl = build3 (COND_EXPR,
777 build2 (EQ_EXPR, boolean_type_node,
778 current_in_charge_parm, integer_zero_node),
783 /* Compute the location of the vtpr. */
784 vtbl_ptr = build_vfield_ref (build_indirect_ref (decl, NULL),
786 gcc_assert (vtbl_ptr != error_mark_node);
788 /* Assign the vtable to the vptr. */
789 vtbl = convert_force (TREE_TYPE (vtbl_ptr), vtbl, 0);
790 finish_expr_stmt (build_modify_expr (vtbl_ptr, NOP_EXPR, vtbl));
793 /* If an exception is thrown in a constructor, those base classes already
794 constructed must be destroyed. This function creates the cleanup
795 for BINFO, which has just been constructed. If FLAG is non-NULL,
796 it is a DECL which is nonzero when this base needs to be
800 expand_cleanup_for_base (tree binfo, tree flag)
804 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (binfo)))
807 /* Call the destructor. */
808 expr = build_special_member_call (current_class_ref,
809 base_dtor_identifier,
812 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL);
814 expr = fold (build3 (COND_EXPR, void_type_node,
815 c_common_truthvalue_conversion (flag),
816 expr, integer_zero_node));
818 finish_eh_cleanup (expr);
821 /* Construct the virtual base-class VBASE passing the ARGUMENTS to its
825 construct_virtual_base (tree vbase, tree arguments)
831 /* If there are virtual base classes with destructors, we need to
832 emit cleanups to destroy them if an exception is thrown during
833 the construction process. These exception regions (i.e., the
834 period during which the cleanups must occur) begin from the time
835 the construction is complete to the end of the function. If we
836 create a conditional block in which to initialize the
837 base-classes, then the cleanup region for the virtual base begins
838 inside a block, and ends outside of that block. This situation
839 confuses the sjlj exception-handling code. Therefore, we do not
840 create a single conditional block, but one for each
841 initialization. (That way the cleanup regions always begin
842 in the outer block.) We trust the back-end to figure out
843 that the FLAG will not change across initializations, and
844 avoid doing multiple tests. */
845 flag = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl));
846 inner_if_stmt = begin_if_stmt ();
847 finish_if_stmt_cond (flag, inner_if_stmt);
849 /* Compute the location of the virtual base. If we're
850 constructing virtual bases, then we must be the most derived
851 class. Therefore, we don't have to look up the virtual base;
852 we already know where it is. */
853 exp = convert_to_base_statically (current_class_ref, vbase);
855 expand_aggr_init_1 (vbase, current_class_ref, exp, arguments,
857 finish_then_clause (inner_if_stmt);
858 finish_if_stmt (inner_if_stmt);
860 expand_cleanup_for_base (vbase, flag);
863 /* Find the context in which this FIELD can be initialized. */
866 initializing_context (tree field)
868 tree t = DECL_CONTEXT (field);
870 /* Anonymous union members can be initialized in the first enclosing
871 non-anonymous union context. */
872 while (t && ANON_AGGR_TYPE_P (t))
873 t = TYPE_CONTEXT (t);
877 /* Function to give error message if member initialization specification
878 is erroneous. FIELD is the member we decided to initialize.
879 TYPE is the type for which the initialization is being performed.
880 FIELD must be a member of TYPE.
882 MEMBER_NAME is the name of the member. */
885 member_init_ok_or_else (tree field, tree type, tree member_name)
887 if (field == error_mark_node)
891 error ("class %qT does not have any field named %qD", type,
895 if (TREE_CODE (field) == VAR_DECL)
897 error ("%q#D is a static data member; it can only be "
898 "initialized at its definition",
902 if (TREE_CODE (field) != FIELD_DECL)
904 error ("%q#D is not a non-static data member of %qT",
908 if (initializing_context (field) != type)
910 error ("class %qT does not have any field named %qD", type,
918 /* NAME is a FIELD_DECL, an IDENTIFIER_NODE which names a field, or it
919 is a _TYPE node or TYPE_DECL which names a base for that type.
920 Check the validity of NAME, and return either the base _TYPE, base
921 binfo, or the FIELD_DECL of the member. If NAME is invalid, return
922 NULL_TREE and issue a diagnostic.
924 An old style unnamed direct single base construction is permitted,
925 where NAME is NULL. */
928 expand_member_init (tree name)
933 if (!current_class_ref)
938 /* This is an obsolete unnamed base class initializer. The
939 parser will already have warned about its use. */
940 switch (BINFO_N_BASE_BINFOS (TYPE_BINFO (current_class_type)))
943 error ("unnamed initializer for %qT, which has no base classes",
947 basetype = BINFO_TYPE
948 (BINFO_BASE_BINFO (TYPE_BINFO (current_class_type), 0));
951 error ("unnamed initializer for %qT, which uses multiple inheritance",
956 else if (TYPE_P (name))
958 basetype = TYPE_MAIN_VARIANT (name);
959 name = TYPE_NAME (name);
961 else if (TREE_CODE (name) == TYPE_DECL)
962 basetype = TYPE_MAIN_VARIANT (TREE_TYPE (name));
964 basetype = NULL_TREE;
973 if (current_template_parms)
976 class_binfo = TYPE_BINFO (current_class_type);
977 direct_binfo = NULL_TREE;
978 virtual_binfo = NULL_TREE;
980 /* Look for a direct base. */
981 for (i = 0; BINFO_BASE_ITERATE (class_binfo, i, direct_binfo); ++i)
982 if (SAME_BINFO_TYPE_P (BINFO_TYPE (direct_binfo), basetype))
985 /* Look for a virtual base -- unless the direct base is itself
987 if (!direct_binfo || !BINFO_VIRTUAL_P (direct_binfo))
988 virtual_binfo = binfo_for_vbase (basetype, current_class_type);
992 If a mem-initializer-id is ambiguous because it designates
993 both a direct non-virtual base class and an inherited virtual
994 base class, the mem-initializer is ill-formed. */
995 if (direct_binfo && virtual_binfo)
997 error ("%qD is both a direct base and an indirect virtual base",
1002 if (!direct_binfo && !virtual_binfo)
1004 if (CLASSTYPE_VBASECLASSES (current_class_type))
1005 error ("type %qD is not a direct or virtual base of %qT",
1006 name, current_class_type);
1008 error ("type %qD is not a direct base of %qT",
1009 name, current_class_type);
1013 return direct_binfo ? direct_binfo : virtual_binfo;
1017 if (TREE_CODE (name) == IDENTIFIER_NODE)
1018 field = lookup_field (current_class_type, name, 1, false);
1022 if (member_init_ok_or_else (field, current_class_type, name))
1029 /* This is like `expand_member_init', only it stores one aggregate
1032 INIT comes in two flavors: it is either a value which
1033 is to be stored in EXP, or it is a parameter list
1034 to go to a constructor, which will operate on EXP.
1035 If INIT is not a parameter list for a constructor, then set
1036 LOOKUP_ONLYCONVERTING.
1037 If FLAGS is LOOKUP_ONLYCONVERTING then it is the = init form of
1038 the initializer, if FLAGS is 0, then it is the (init) form.
1039 If `init' is a CONSTRUCTOR, then we emit a warning message,
1040 explaining that such initializations are invalid.
1042 If INIT resolves to a CALL_EXPR which happens to return
1043 something of the type we are looking for, then we know
1044 that we can safely use that call to perform the
1047 The virtual function table pointer cannot be set up here, because
1048 we do not really know its type.
1050 This never calls operator=().
1052 When initializing, nothing is CONST.
1054 A default copy constructor may have to be used to perform the
1057 A constructor or a conversion operator may have to be used to
1058 perform the initialization, but not both, as it would be ambiguous. */
1061 build_aggr_init (tree exp, tree init, int flags)
1066 tree type = TREE_TYPE (exp);
1067 int was_const = TREE_READONLY (exp);
1068 int was_volatile = TREE_THIS_VOLATILE (exp);
1071 if (init == error_mark_node)
1072 return error_mark_node;
1074 TREE_READONLY (exp) = 0;
1075 TREE_THIS_VOLATILE (exp) = 0;
1077 if (init && TREE_CODE (init) != TREE_LIST)
1078 flags |= LOOKUP_ONLYCONVERTING;
1080 if (TREE_CODE (type) == ARRAY_TYPE)
1084 /* An array may not be initialized use the parenthesized
1085 initialization form -- unless the initializer is "()". */
1086 if (init && TREE_CODE (init) == TREE_LIST)
1088 error ("bad array initializer");
1089 return error_mark_node;
1091 /* Must arrange to initialize each element of EXP
1092 from elements of INIT. */
1093 itype = init ? TREE_TYPE (init) : NULL_TREE;
1094 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
1095 TREE_TYPE (exp) = TYPE_MAIN_VARIANT (type);
1096 if (itype && cp_type_quals (itype) != TYPE_UNQUALIFIED)
1097 itype = TREE_TYPE (init) = TYPE_MAIN_VARIANT (itype);
1098 stmt_expr = build_vec_init (exp, NULL_TREE, init,
1099 itype && same_type_p (itype,
1101 TREE_READONLY (exp) = was_const;
1102 TREE_THIS_VOLATILE (exp) = was_volatile;
1103 TREE_TYPE (exp) = type;
1105 TREE_TYPE (init) = itype;
1109 if (TREE_CODE (exp) == VAR_DECL || TREE_CODE (exp) == PARM_DECL)
1110 /* Just know that we've seen something for this node. */
1111 TREE_USED (exp) = 1;
1113 TREE_TYPE (exp) = TYPE_MAIN_VARIANT (type);
1114 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
1115 destroy_temps = stmts_are_full_exprs_p ();
1116 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
1117 expand_aggr_init_1 (TYPE_BINFO (type), exp, exp,
1118 init, LOOKUP_NORMAL|flags);
1119 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
1120 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
1121 TREE_TYPE (exp) = type;
1122 TREE_READONLY (exp) = was_const;
1123 TREE_THIS_VOLATILE (exp) = was_volatile;
1128 /* Like build_aggr_init, but not just for aggregates. */
1131 build_init (tree decl, tree init, int flags)
1135 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1136 expr = build_aggr_init (decl, init, flags);
1137 else if (CLASS_TYPE_P (TREE_TYPE (decl)))
1138 expr = build_special_member_call (decl, complete_ctor_identifier,
1139 build_tree_list (NULL_TREE, init),
1141 LOOKUP_NORMAL|flags);
1143 expr = build2 (INIT_EXPR, TREE_TYPE (decl), decl, init);
1149 expand_default_init (tree binfo, tree true_exp, tree exp, tree init, int flags)
1151 tree type = TREE_TYPE (exp);
1154 /* It fails because there may not be a constructor which takes
1155 its own type as the first (or only parameter), but which does
1156 take other types via a conversion. So, if the thing initializing
1157 the expression is a unit element of type X, first try X(X&),
1158 followed by initialization by X. If neither of these work
1159 out, then look hard. */
1163 if (init && TREE_CODE (init) != TREE_LIST
1164 && (flags & LOOKUP_ONLYCONVERTING))
1166 /* Base subobjects should only get direct-initialization. */
1167 gcc_assert (true_exp == exp);
1169 if (flags & DIRECT_BIND)
1170 /* Do nothing. We hit this in two cases: Reference initialization,
1171 where we aren't initializing a real variable, so we don't want
1172 to run a new constructor; and catching an exception, where we
1173 have already built up the constructor call so we could wrap it
1174 in an exception region. */;
1175 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
1177 /* A brace-enclosed initializer for an aggregate. */
1178 gcc_assert (CP_AGGREGATE_TYPE_P (type));
1179 init = digest_init (type, init, (tree *)NULL);
1182 init = ocp_convert (type, init, CONV_IMPLICIT|CONV_FORCE_TEMP, flags);
1184 if (TREE_CODE (init) == MUST_NOT_THROW_EXPR)
1185 /* We need to protect the initialization of a catch parm with a
1186 call to terminate(), which shows up as a MUST_NOT_THROW_EXPR
1187 around the TARGET_EXPR for the copy constructor. See
1188 initialize_handler_parm. */
1190 TREE_OPERAND (init, 0) = build2 (INIT_EXPR, TREE_TYPE (exp), exp,
1191 TREE_OPERAND (init, 0));
1192 TREE_TYPE (init) = void_type_node;
1195 init = build2 (INIT_EXPR, TREE_TYPE (exp), exp, init);
1196 TREE_SIDE_EFFECTS (init) = 1;
1197 finish_expr_stmt (init);
1201 if (init == NULL_TREE
1202 || (TREE_CODE (init) == TREE_LIST && ! TREE_TYPE (init)))
1206 init = TREE_VALUE (parms);
1209 parms = build_tree_list (NULL_TREE, init);
1211 if (true_exp == exp)
1212 ctor_name = complete_ctor_identifier;
1214 ctor_name = base_ctor_identifier;
1216 rval = build_special_member_call (exp, ctor_name, parms, binfo, flags);
1217 if (TREE_SIDE_EFFECTS (rval))
1218 finish_expr_stmt (convert_to_void (rval, NULL));
1221 /* This function is responsible for initializing EXP with INIT
1224 BINFO is the binfo of the type for who we are performing the
1225 initialization. For example, if W is a virtual base class of A and B,
1227 If we are initializing B, then W must contain B's W vtable, whereas
1228 were we initializing C, W must contain C's W vtable.
1230 TRUE_EXP is nonzero if it is the true expression being initialized.
1231 In this case, it may be EXP, or may just contain EXP. The reason we
1232 need this is because if EXP is a base element of TRUE_EXP, we
1233 don't necessarily know by looking at EXP where its virtual
1234 baseclass fields should really be pointing. But we do know
1235 from TRUE_EXP. In constructors, we don't know anything about
1236 the value being initialized.
1238 FLAGS is just passed to `build_new_method_call'. See that function
1239 for its description. */
1242 expand_aggr_init_1 (tree binfo, tree true_exp, tree exp, tree init, int flags)
1244 tree type = TREE_TYPE (exp);
1246 gcc_assert (init != error_mark_node && type != error_mark_node);
1247 gcc_assert (building_stmt_tree ());
1249 /* Use a function returning the desired type to initialize EXP for us.
1250 If the function is a constructor, and its first argument is
1251 NULL_TREE, know that it was meant for us--just slide exp on
1252 in and expand the constructor. Constructors now come
1255 if (init && TREE_CODE (exp) == VAR_DECL
1256 && TREE_CODE (init) == CONSTRUCTOR
1257 && TREE_HAS_CONSTRUCTOR (init))
1259 /* If store_init_value returns NULL_TREE, the INIT has been
1260 record in the DECL_INITIAL for EXP. That means there's
1261 nothing more we have to do. */
1262 init = store_init_value (exp, init);
1264 finish_expr_stmt (init);
1268 /* We know that expand_default_init can handle everything we want
1270 expand_default_init (binfo, true_exp, exp, init, flags);
1273 /* Report an error if TYPE is not a user-defined, aggregate type. If
1274 OR_ELSE is nonzero, give an error message. */
1277 is_aggr_type (tree type, int or_else)
1279 if (type == error_mark_node)
1282 if (! IS_AGGR_TYPE (type)
1283 && TREE_CODE (type) != TEMPLATE_TYPE_PARM
1284 && TREE_CODE (type) != BOUND_TEMPLATE_TEMPLATE_PARM)
1287 error ("%qT is not an aggregate type", type);
1294 get_type_value (tree name)
1296 if (name == error_mark_node)
1299 if (IDENTIFIER_HAS_TYPE_VALUE (name))
1300 return IDENTIFIER_TYPE_VALUE (name);
1305 /* Build a reference to a member of an aggregate. This is not a C++
1306 `&', but really something which can have its address taken, and
1307 then act as a pointer to member, for example TYPE :: FIELD can have
1308 its address taken by saying & TYPE :: FIELD. ADDRESS_P is true if
1309 this expression is the operand of "&".
1311 @@ Prints out lousy diagnostics for operator <typename>
1314 @@ This function should be rewritten and placed in search.c. */
1317 build_offset_ref (tree type, tree name, bool address_p)
1321 tree basebinfo = NULL_TREE;
1322 tree orig_name = name;
1324 /* class templates can come in as TEMPLATE_DECLs here. */
1325 if (TREE_CODE (name) == TEMPLATE_DECL)
1328 if (dependent_type_p (type) || type_dependent_expression_p (name))
1329 return build_min_nt (SCOPE_REF, type, name);
1331 if (TREE_CODE (name) == TEMPLATE_ID_EXPR)
1333 /* If the NAME is a TEMPLATE_ID_EXPR, we are looking at
1334 something like `a.template f<int>' or the like. For the most
1335 part, we treat this just like a.f. We do remember, however,
1336 the template-id that was used. */
1337 name = TREE_OPERAND (orig_name, 0);
1340 name = DECL_NAME (name);
1343 if (TREE_CODE (name) == COMPONENT_REF)
1344 name = TREE_OPERAND (name, 1);
1345 if (TREE_CODE (name) == OVERLOAD)
1346 name = DECL_NAME (OVL_CURRENT (name));
1349 gcc_assert (TREE_CODE (name) == IDENTIFIER_NODE);
1352 if (type == NULL_TREE)
1353 return error_mark_node;
1355 /* Handle namespace names fully here. */
1356 if (TREE_CODE (type) == NAMESPACE_DECL)
1358 tree t = lookup_namespace_name (type, name);
1359 if (t == error_mark_node)
1361 if (TREE_CODE (orig_name) == TEMPLATE_ID_EXPR)
1362 /* Reconstruct the TEMPLATE_ID_EXPR. */
1363 t = build2 (TEMPLATE_ID_EXPR, TREE_TYPE (t),
1364 t, TREE_OPERAND (orig_name, 1));
1365 if (! type_unknown_p (t))
1368 t = convert_from_reference (t);
1373 if (! is_aggr_type (type, 1))
1374 return error_mark_node;
1376 if (TREE_CODE (name) == BIT_NOT_EXPR)
1378 if (! check_dtor_name (type, name))
1379 error ("qualified type %qT does not match destructor name %<~%T%>",
1380 type, TREE_OPERAND (name, 0));
1381 name = dtor_identifier;
1384 if (!COMPLETE_TYPE_P (complete_type (type))
1385 && !TYPE_BEING_DEFINED (type))
1387 error ("incomplete type %qT does not have member %qD", type, name);
1388 return error_mark_node;
1391 /* Set up BASEBINFO for member lookup. */
1392 decl = maybe_dummy_object (type, &basebinfo);
1394 if (BASELINK_P (name) || DECL_P (name))
1398 member = lookup_member (basebinfo, name, 1, 0);
1400 if (member == error_mark_node)
1401 return error_mark_node;
1406 error ("%qD is not a member of type %qT", name, type);
1407 return error_mark_node;
1410 if (processing_template_decl)
1412 if (TREE_CODE (orig_name) == TEMPLATE_ID_EXPR)
1413 return build_min (SCOPE_REF, TREE_TYPE (member), type, orig_name);
1415 return build_min (SCOPE_REF, TREE_TYPE (member), type, name);
1418 if (TREE_CODE (member) == TYPE_DECL)
1420 TREE_USED (member) = 1;
1423 /* static class members and class-specific enum
1424 values can be returned without further ado. */
1425 if (TREE_CODE (member) == VAR_DECL || TREE_CODE (member) == CONST_DECL)
1428 return convert_from_reference (member);
1431 if (TREE_CODE (member) == FIELD_DECL && DECL_C_BIT_FIELD (member))
1433 error ("invalid pointer to bit-field %qD", member);
1434 return error_mark_node;
1437 /* A lot of this logic is now handled in lookup_member. */
1438 if (BASELINK_P (member))
1440 /* Go from the TREE_BASELINK to the member function info. */
1441 tree fnfields = member;
1442 tree t = BASELINK_FUNCTIONS (fnfields);
1444 if (TREE_CODE (orig_name) == TEMPLATE_ID_EXPR)
1446 /* The FNFIELDS are going to contain functions that aren't
1447 necessarily templates, and templates that don't
1448 necessarily match the explicit template parameters. We
1449 save all the functions, and the explicit parameters, and
1450 then figure out exactly what to instantiate with what
1451 arguments in instantiate_type. */
1453 if (TREE_CODE (t) != OVERLOAD)
1454 /* The code in instantiate_type which will process this
1455 expects to encounter OVERLOADs, not raw functions. */
1456 t = ovl_cons (t, NULL_TREE);
1458 t = build2 (TEMPLATE_ID_EXPR, TREE_TYPE (t), t,
1459 TREE_OPERAND (orig_name, 1));
1460 t = build2 (OFFSET_REF, unknown_type_node, decl, t);
1462 PTRMEM_OK_P (t) = 1;
1467 if (TREE_CODE (t) != TEMPLATE_ID_EXPR && !really_overloaded_fn (t))
1469 /* Get rid of a potential OVERLOAD around it. */
1470 t = OVL_CURRENT (t);
1472 /* Unique functions are handled easily. */
1474 /* For non-static member of base class, we need a special rule
1475 for access checking [class.protected]:
1477 If the access is to form a pointer to member, the
1478 nested-name-specifier shall name the derived class
1479 (or any class derived from that class). */
1480 if (address_p && DECL_P (t)
1481 && DECL_NONSTATIC_MEMBER_P (t))
1482 perform_or_defer_access_check (TYPE_BINFO (type), t);
1484 perform_or_defer_access_check (basebinfo, t);
1487 if (DECL_STATIC_FUNCTION_P (t))
1493 TREE_TYPE (fnfields) = unknown_type_node;
1497 else if (address_p && TREE_CODE (member) == FIELD_DECL)
1498 /* We need additional test besides the one in
1499 check_accessibility_of_qualified_id in case it is
1500 a pointer to non-static member. */
1501 perform_or_defer_access_check (TYPE_BINFO (type), member);
1505 /* If MEMBER is non-static, then the program has fallen afoul of
1508 An id-expression that denotes a nonstatic data member or
1509 nonstatic member function of a class can only be used:
1511 -- as part of a class member access (_expr.ref_) in which the
1512 object-expression refers to the member's class or a class
1513 derived from that class, or
1515 -- to form a pointer to member (_expr.unary.op_), or
1517 -- in the body of a nonstatic member function of that class or
1518 of a class derived from that class (_class.mfct.nonstatic_), or
1520 -- in a mem-initializer for a constructor for that class or for
1521 a class derived from that class (_class.base.init_). */
1522 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (member))
1524 /* Build a representation of a the qualified name suitable
1525 for use as the operand to "&" -- even though the "&" is
1526 not actually present. */
1527 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1528 /* In Microsoft mode, treat a non-static member function as if
1529 it were a pointer-to-member. */
1530 if (flag_ms_extensions)
1532 PTRMEM_OK_P (member) = 1;
1533 return build_unary_op (ADDR_EXPR, member, 0);
1535 error ("invalid use of non-static member function %qD",
1536 TREE_OPERAND (member, 1));
1539 else if (TREE_CODE (member) == FIELD_DECL)
1541 error ("invalid use of non-static data member %qD", member);
1542 return error_mark_node;
1547 /* In member functions, the form `type::name' is no longer
1548 equivalent to `this->type::name', at least not until
1549 resolve_offset_ref. */
1550 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1551 PTRMEM_OK_P (member) = 1;
1555 /* If DECL is a `const' declaration, and its value is a known
1556 constant, then return that value. */
1559 decl_constant_value (tree decl)
1561 /* When we build a COND_EXPR, we don't know whether it will be used
1562 as an lvalue or as an rvalue. If it is an lvalue, it's not safe
1563 to replace the second and third operands with their
1564 initializers. So, we do that here. */
1565 if (TREE_CODE (decl) == COND_EXPR)
1570 d1 = decl_constant_value (TREE_OPERAND (decl, 1));
1571 d2 = decl_constant_value (TREE_OPERAND (decl, 2));
1573 if (d1 != TREE_OPERAND (decl, 1) || d2 != TREE_OPERAND (decl, 2))
1574 return build3 (COND_EXPR,
1576 TREE_OPERAND (decl, 0), d1, d2);
1580 && (/* Enumeration constants are constant. */
1581 TREE_CODE (decl) == CONST_DECL
1582 /* And so are variables with a 'const' type -- unless they
1583 are also 'volatile'. */
1584 || CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (decl)))
1585 && TREE_CODE (decl) != PARM_DECL
1586 && DECL_INITIAL (decl)
1587 && DECL_INITIAL (decl) != error_mark_node
1588 /* This is invalid if initial value is not constant.
1589 If it has either a function call, a memory reference,
1590 or a variable, then re-evaluating it could give different results. */
1591 && TREE_CONSTANT (DECL_INITIAL (decl))
1592 /* Check for cases where this is sub-optimal, even though valid. */
1593 && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR)
1594 return DECL_INITIAL (decl);
1598 /* Common subroutines of build_new and build_vec_delete. */
1600 /* Call the global __builtin_delete to delete ADDR. */
1603 build_builtin_delete_call (tree addr)
1605 mark_used (global_delete_fndecl);
1606 return build_call (global_delete_fndecl, build_tree_list (NULL_TREE, addr));
1609 /* Generate a representation for a C++ "new" expression. PLACEMENT is
1610 a TREE_LIST of placement-new arguments (or NULL_TREE if none). If
1611 NELTS is NULL, TYPE is the type of the storage to be allocated. If
1612 NELTS is not NULL, then this is an array-new allocation; TYPE is
1613 the type of the elements in the array and NELTS is the number of
1614 elements in the array. INIT, if non-NULL, is the initializer for
1615 the new object. If USE_GLOBAL_NEW is true, then the user
1616 explicitly wrote "::new" rather than just "new". */
1619 build_new (tree placement, tree type, tree nelts, tree init,
1624 if (type == error_mark_node)
1625 return error_mark_node;
1627 if (processing_template_decl)
1629 rval = build_min (NEW_EXPR, build_pointer_type (type),
1630 placement, type, nelts, init);
1631 NEW_EXPR_USE_GLOBAL (rval) = use_global_new;
1632 TREE_SIDE_EFFECTS (rval) = 1;
1636 /* ``A reference cannot be created by the new operator. A reference
1637 is not an object (8.2.2, 8.4.3), so a pointer to it could not be
1638 returned by new.'' ARM 5.3.3 */
1639 if (TREE_CODE (type) == REFERENCE_TYPE)
1641 error ("new cannot be applied to a reference type");
1642 type = TREE_TYPE (type);
1645 if (TREE_CODE (type) == FUNCTION_TYPE)
1647 error ("new cannot be applied to a function type");
1648 return error_mark_node;
1651 rval = build4 (NEW_EXPR, build_pointer_type (type), placement, type,
1653 NEW_EXPR_USE_GLOBAL (rval) = use_global_new;
1654 TREE_SIDE_EFFECTS (rval) = 1;
1655 rval = build_new_1 (rval);
1656 if (rval == error_mark_node)
1657 return error_mark_node;
1659 /* Wrap it in a NOP_EXPR so warn_if_unused_value doesn't complain. */
1660 rval = build1 (NOP_EXPR, TREE_TYPE (rval), rval);
1661 TREE_NO_WARNING (rval) = 1;
1666 /* Given a Java class, return a decl for the corresponding java.lang.Class. */
1669 build_java_class_ref (tree type)
1671 tree name = NULL_TREE, class_decl;
1672 static tree CL_suffix = NULL_TREE;
1673 if (CL_suffix == NULL_TREE)
1674 CL_suffix = get_identifier("class$");
1675 if (jclass_node == NULL_TREE)
1677 jclass_node = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
1678 if (jclass_node == NULL_TREE)
1679 fatal_error ("call to Java constructor, while %<jclass%> undefined");
1681 jclass_node = TREE_TYPE (jclass_node);
1684 /* Mangle the class$ field. */
1687 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1688 if (DECL_NAME (field) == CL_suffix)
1690 mangle_decl (field);
1691 name = DECL_ASSEMBLER_NAME (field);
1695 internal_error ("can't find class$");
1698 class_decl = IDENTIFIER_GLOBAL_VALUE (name);
1699 if (class_decl == NULL_TREE)
1701 class_decl = build_decl (VAR_DECL, name, TREE_TYPE (jclass_node));
1702 TREE_STATIC (class_decl) = 1;
1703 DECL_EXTERNAL (class_decl) = 1;
1704 TREE_PUBLIC (class_decl) = 1;
1705 DECL_ARTIFICIAL (class_decl) = 1;
1706 DECL_IGNORED_P (class_decl) = 1;
1707 pushdecl_top_level (class_decl);
1708 make_decl_rtl (class_decl);
1714 /* Called from cplus_expand_expr when expanding a NEW_EXPR. The return
1715 value is immediately handed to expand_expr. */
1718 build_new_1 (tree exp)
1720 tree placement, init;
1722 /* True iff this is a call to "operator new[]" instead of just
1724 bool array_p = false;
1725 /* True iff ARRAY_P is true and the bound of the array type is
1726 not necessarily a compile time constant. For example, VLA_P is
1727 true for "new int[f()]". */
1729 /* The type being allocated. If ARRAY_P is true, this will be an
1732 /* If ARRAY_P is true, the element type of the array. This is an
1733 never ARRAY_TYPE; for something like "new int[3][4]", the
1734 ELT_TYPE is "int". If ARRAY_P is false, this is the same type as
1737 /* The type of the new-expression. (This type is always a pointer
1740 /* The type pointed to by POINTER_TYPE. This type may be different
1741 from ELT_TYPE for a multi-dimensional array; ELT_TYPE is never an
1742 ARRAY_TYPE, but TYPE may be an ARRAY_TYPE. */
1744 /* A pointer type pointing to to the FULL_TYPE. */
1745 tree full_pointer_type;
1746 tree outer_nelts = NULL_TREE;
1747 tree nelts = NULL_TREE;
1748 tree alloc_call, alloc_expr;
1749 /* The address returned by the call to "operator new". This node is
1750 a VAR_DECL and is therefore reusable. */
1753 tree cookie_expr, init_expr;
1754 int nothrow, check_new;
1755 /* Nonzero if the user wrote `::new' rather than just `new'. */
1756 int globally_qualified_p;
1757 int use_java_new = 0;
1758 /* If non-NULL, the number of extra bytes to allocate at the
1759 beginning of the storage allocated for an array-new expression in
1760 order to store the number of elements. */
1761 tree cookie_size = NULL_TREE;
1762 /* True if the function we are calling is a placement allocation
1764 bool placement_allocation_fn_p;
1765 tree args = NULL_TREE;
1766 /* True if the storage must be initialized, either by a constructor
1767 or due to an explicit new-initializer. */
1768 bool is_initialized;
1769 /* The address of the thing allocated, not including any cookie. In
1770 particular, if an array cookie is in use, DATA_ADDR is the
1771 address of the first array element. This node is a VAR_DECL, and
1772 is therefore reusable. */
1774 tree init_preeval_expr = NULL_TREE;
1776 placement = TREE_OPERAND (exp, 0);
1777 type = TREE_OPERAND (exp, 1);
1778 nelts = TREE_OPERAND (exp, 2);
1779 init = TREE_OPERAND (exp, 3);
1780 globally_qualified_p = NEW_EXPR_USE_GLOBAL (exp);
1786 outer_nelts = nelts;
1789 /* ??? The middle-end will error on us for building a VLA outside a
1790 function context. Methinks that's not it's purvey. So we'll do
1791 our own VLA layout later. */
1793 full_type = build_cplus_array_type (type, NULL_TREE);
1794 index = convert (sizetype, nelts);
1795 index = size_binop (MINUS_EXPR, index, size_one_node);
1796 TYPE_DOMAIN (full_type) = build_index_type (index);
1801 if (TREE_CODE (type) == ARRAY_TYPE)
1804 nelts = array_type_nelts_top (type);
1805 outer_nelts = nelts;
1806 type = TREE_TYPE (type);
1810 /* If our base type is an array, then make sure we know how many elements
1812 for (elt_type = type;
1813 TREE_CODE (elt_type) == ARRAY_TYPE;
1814 elt_type = TREE_TYPE (elt_type))
1815 nelts = cp_build_binary_op (MULT_EXPR, nelts,
1816 array_type_nelts_top (elt_type));
1818 if (!complete_type_or_else (elt_type, exp))
1819 return error_mark_node;
1821 if (TREE_CODE (elt_type) == VOID_TYPE)
1823 error ("invalid type %<void%> for new");
1824 return error_mark_node;
1827 if (abstract_virtuals_error (NULL_TREE, elt_type))
1828 return error_mark_node;
1830 is_initialized = (TYPE_NEEDS_CONSTRUCTING (elt_type) || init);
1831 if (CP_TYPE_CONST_P (elt_type) && !is_initialized)
1833 error ("uninitialized const in %<new%> of %q#T", elt_type);
1834 return error_mark_node;
1837 size = size_in_bytes (elt_type);
1840 size = size_binop (MULT_EXPR, size, convert (sizetype, nelts));
1845 /* Do our own VLA layout. Setting TYPE_SIZE/_UNIT is
1846 necessary in order for the <INIT_EXPR <*foo> <CONSTRUCTOR
1847 ...>> to be valid. */
1848 TYPE_SIZE_UNIT (full_type) = size;
1849 n = convert (bitsizetype, nelts);
1850 bitsize = size_binop (MULT_EXPR, TYPE_SIZE (elt_type), n);
1851 TYPE_SIZE (full_type) = bitsize;
1855 /* Allocate the object. */
1856 if (! placement && TYPE_FOR_JAVA (elt_type))
1858 tree class_addr, alloc_decl;
1859 tree class_decl = build_java_class_ref (elt_type);
1860 static const char alloc_name[] = "_Jv_AllocObject";
1864 if (!get_global_value_if_present (get_identifier (alloc_name),
1867 error ("call to Java constructor with %qs undefined", alloc_name);
1868 return error_mark_node;
1870 else if (really_overloaded_fn (alloc_decl))
1872 error ("%qD should never be overloaded", alloc_decl);
1873 return error_mark_node;
1875 alloc_decl = OVL_CURRENT (alloc_decl);
1876 class_addr = build1 (ADDR_EXPR, jclass_node, class_decl);
1877 alloc_call = (build_function_call
1879 build_tree_list (NULL_TREE, class_addr)));
1886 fnname = ansi_opname (array_p ? VEC_NEW_EXPR : NEW_EXPR);
1888 if (!globally_qualified_p
1889 && CLASS_TYPE_P (elt_type)
1891 ? TYPE_HAS_ARRAY_NEW_OPERATOR (elt_type)
1892 : TYPE_HAS_NEW_OPERATOR (elt_type)))
1894 /* Use a class-specific operator new. */
1895 /* If a cookie is required, add some extra space. */
1896 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1898 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1899 size = size_binop (PLUS_EXPR, size, cookie_size);
1901 /* Create the argument list. */
1902 args = tree_cons (NULL_TREE, size, placement);
1903 /* Do name-lookup to find the appropriate operator. */
1904 fns = lookup_fnfields (elt_type, fnname, /*protect=*/2);
1905 if (TREE_CODE (fns) == TREE_LIST)
1907 error ("request for member %qD is ambiguous", fnname);
1908 print_candidates (fns);
1909 return error_mark_node;
1911 alloc_call = build_new_method_call (build_dummy_object (elt_type),
1913 /*conversion_path=*/NULL_TREE,
1918 /* Use a global operator new. */
1919 /* See if a cookie might be required. */
1920 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1921 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1923 cookie_size = NULL_TREE;
1925 alloc_call = build_operator_new_call (fnname, placement,
1926 &size, &cookie_size);
1930 if (alloc_call == error_mark_node)
1931 return error_mark_node;
1933 /* In the simple case, we can stop now. */
1934 pointer_type = build_pointer_type (type);
1935 if (!cookie_size && !is_initialized)
1936 return build_nop (pointer_type, alloc_call);
1938 /* While we're working, use a pointer to the type we've actually
1939 allocated. Store the result of the call in a variable so that we
1940 can use it more than once. */
1941 full_pointer_type = build_pointer_type (full_type);
1942 alloc_expr = get_target_expr (build_nop (full_pointer_type, alloc_call));
1943 alloc_node = TARGET_EXPR_SLOT (alloc_expr);
1945 /* Strip any COMPOUND_EXPRs from ALLOC_CALL. */
1946 while (TREE_CODE (alloc_call) == COMPOUND_EXPR)
1947 alloc_call = TREE_OPERAND (alloc_call, 1);
1948 alloc_fn = get_callee_fndecl (alloc_call);
1949 gcc_assert (alloc_fn != NULL_TREE);
1951 /* Now, check to see if this function is actually a placement
1952 allocation function. This can happen even when PLACEMENT is NULL
1953 because we might have something like:
1955 struct S { void* operator new (size_t, int i = 0); };
1957 A call to `new S' will get this allocation function, even though
1958 there is no explicit placement argument. If there is more than
1959 one argument, or there are variable arguments, then this is a
1960 placement allocation function. */
1961 placement_allocation_fn_p
1962 = (type_num_arguments (TREE_TYPE (alloc_fn)) > 1
1963 || varargs_function_p (alloc_fn));
1965 /* Preevaluate the placement args so that we don't reevaluate them for a
1966 placement delete. */
1967 if (placement_allocation_fn_p)
1970 stabilize_call (alloc_call, &inits);
1972 alloc_expr = build2 (COMPOUND_EXPR, TREE_TYPE (alloc_expr), inits,
1976 /* unless an allocation function is declared with an empty excep-
1977 tion-specification (_except.spec_), throw(), it indicates failure to
1978 allocate storage by throwing a bad_alloc exception (clause _except_,
1979 _lib.bad.alloc_); it returns a non-null pointer otherwise If the allo-
1980 cation function is declared with an empty exception-specification,
1981 throw(), it returns null to indicate failure to allocate storage and a
1982 non-null pointer otherwise.
1984 So check for a null exception spec on the op new we just called. */
1986 nothrow = TYPE_NOTHROW_P (TREE_TYPE (alloc_fn));
1987 check_new = (flag_check_new || nothrow) && ! use_java_new;
1994 /* Adjust so we're pointing to the start of the object. */
1995 data_addr = get_target_expr (build2 (PLUS_EXPR, full_pointer_type,
1996 alloc_node, cookie_size));
1998 /* Store the number of bytes allocated so that we can know how
1999 many elements to destroy later. We use the last sizeof
2000 (size_t) bytes to store the number of elements. */
2001 cookie_ptr = build2 (MINUS_EXPR, build_pointer_type (sizetype),
2002 data_addr, size_in_bytes (sizetype));
2003 cookie = build_indirect_ref (cookie_ptr, NULL);
2005 cookie_expr = build2 (MODIFY_EXPR, sizetype, cookie, nelts);
2007 if (targetm.cxx.cookie_has_size ())
2009 /* Also store the element size. */
2010 cookie_ptr = build2 (MINUS_EXPR, build_pointer_type (sizetype),
2011 cookie_ptr, size_in_bytes (sizetype));
2012 cookie = build_indirect_ref (cookie_ptr, NULL);
2013 cookie = build2 (MODIFY_EXPR, sizetype, cookie,
2014 size_in_bytes(elt_type));
2015 cookie_expr = build2 (COMPOUND_EXPR, TREE_TYPE (cookie_expr),
2016 cookie, cookie_expr);
2018 data_addr = TARGET_EXPR_SLOT (data_addr);
2022 cookie_expr = NULL_TREE;
2023 data_addr = alloc_node;
2026 /* Now initialize the allocated object. Note that we preevaluate the
2027 initialization expression, apart from the actual constructor call or
2028 assignment--we do this because we want to delay the allocation as long
2029 as possible in order to minimize the size of the exception region for
2030 placement delete. */
2035 init_expr = build_indirect_ref (data_addr, NULL);
2037 if (init == void_zero_node)
2038 init = build_default_init (full_type, nelts);
2039 else if (init && array_p)
2040 pedwarn ("ISO C++ forbids initialization in array new");
2045 = build_vec_init (init_expr,
2046 cp_build_binary_op (MINUS_EXPR, outer_nelts,
2048 init, /*from_array=*/0);
2050 /* An array initialization is stable because the initialization
2051 of each element is a full-expression, so the temporaries don't
2055 else if (TYPE_NEEDS_CONSTRUCTING (type))
2057 init_expr = build_special_member_call (init_expr,
2058 complete_ctor_identifier,
2061 stable = stabilize_init (init_expr, &init_preeval_expr);
2065 /* We are processing something like `new int (10)', which
2066 means allocate an int, and initialize it with 10. */
2068 if (TREE_CODE (init) == TREE_LIST)
2069 init = build_x_compound_expr_from_list (init, "new initializer");
2072 gcc_assert (TREE_CODE (init) != CONSTRUCTOR
2073 || TREE_TYPE (init) != NULL_TREE);
2075 init_expr = build_modify_expr (init_expr, INIT_EXPR, init);
2076 stable = stabilize_init (init_expr, &init_preeval_expr);
2079 if (init_expr == error_mark_node)
2080 return error_mark_node;
2082 /* If any part of the object initialization terminates by throwing an
2083 exception and a suitable deallocation function can be found, the
2084 deallocation function is called to free the memory in which the
2085 object was being constructed, after which the exception continues
2086 to propagate in the context of the new-expression. If no
2087 unambiguous matching deallocation function can be found,
2088 propagating the exception does not cause the object's memory to be
2090 if (flag_exceptions && ! use_java_new)
2092 enum tree_code dcode = array_p ? VEC_DELETE_EXPR : DELETE_EXPR;
2095 /* The Standard is unclear here, but the right thing to do
2096 is to use the same method for finding deallocation
2097 functions that we use for finding allocation functions. */
2098 cleanup = build_op_delete_call (dcode, alloc_node, size,
2099 globally_qualified_p,
2100 (placement_allocation_fn_p
2101 ? alloc_call : NULL_TREE));
2106 /* This is much simpler if we were able to preevaluate all of
2107 the arguments to the constructor call. */
2108 init_expr = build2 (TRY_CATCH_EXPR, void_type_node,
2109 init_expr, cleanup);
2111 /* Ack! First we allocate the memory. Then we set our sentry
2112 variable to true, and expand a cleanup that deletes the
2113 memory if sentry is true. Then we run the constructor, and
2114 finally clear the sentry.
2116 We need to do this because we allocate the space first, so
2117 if there are any temporaries with cleanups in the
2118 constructor args and we weren't able to preevaluate them, we
2119 need this EH region to extend until end of full-expression
2120 to preserve nesting. */
2122 tree end, sentry, begin;
2124 begin = get_target_expr (boolean_true_node);
2125 CLEANUP_EH_ONLY (begin) = 1;
2127 sentry = TARGET_EXPR_SLOT (begin);
2129 TARGET_EXPR_CLEANUP (begin)
2130 = build3 (COND_EXPR, void_type_node, sentry,
2131 cleanup, void_zero_node);
2133 end = build2 (MODIFY_EXPR, TREE_TYPE (sentry),
2134 sentry, boolean_false_node);
2137 = build2 (COMPOUND_EXPR, void_type_node, begin,
2138 build2 (COMPOUND_EXPR, void_type_node, init_expr,
2145 init_expr = NULL_TREE;
2147 /* Now build up the return value in reverse order. */
2152 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_expr, rval);
2154 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), cookie_expr, rval);
2156 if (rval == alloc_node)
2157 /* If we don't have an initializer or a cookie, strip the TARGET_EXPR
2158 and return the call (which doesn't need to be adjusted). */
2159 rval = TARGET_EXPR_INITIAL (alloc_expr);
2164 tree ifexp = cp_build_binary_op (NE_EXPR, alloc_node,
2166 rval = build_conditional_expr (ifexp, rval, alloc_node);
2169 /* Perform the allocation before anything else, so that ALLOC_NODE
2170 has been initialized before we start using it. */
2171 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), alloc_expr, rval);
2174 if (init_preeval_expr)
2175 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_preeval_expr, rval);
2177 /* Convert to the final type. */
2178 rval = build_nop (pointer_type, rval);
2180 /* A new-expression is never an lvalue. */
2181 if (real_lvalue_p (rval))
2182 rval = build1 (NON_LVALUE_EXPR, TREE_TYPE (rval), rval);
2188 build_vec_delete_1 (tree base, tree maxindex, tree type,
2189 special_function_kind auto_delete_vec, int use_global_delete)
2192 tree ptype = build_pointer_type (type = complete_type (type));
2193 tree size_exp = size_in_bytes (type);
2195 /* Temporary variables used by the loop. */
2196 tree tbase, tbase_init;
2198 /* This is the body of the loop that implements the deletion of a
2199 single element, and moves temp variables to next elements. */
2202 /* This is the LOOP_EXPR that governs the deletion of the elements. */
2205 /* This is the thing that governs what to do after the loop has run. */
2206 tree deallocate_expr = 0;
2208 /* This is the BIND_EXPR which holds the outermost iterator of the
2209 loop. It is convenient to set this variable up and test it before
2210 executing any other code in the loop.
2211 This is also the containing expression returned by this function. */
2212 tree controller = NULL_TREE;
2214 /* We should only have 1-D arrays here. */
2215 gcc_assert (TREE_CODE (type) != ARRAY_TYPE);
2217 if (! IS_AGGR_TYPE (type) || TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
2220 /* The below is short by the cookie size. */
2221 virtual_size = size_binop (MULT_EXPR, size_exp,
2222 convert (sizetype, maxindex));
2224 tbase = create_temporary_var (ptype);
2225 tbase_init = build_modify_expr (tbase, NOP_EXPR,
2226 fold (build2 (PLUS_EXPR, ptype,
2229 DECL_REGISTER (tbase) = 1;
2230 controller = build3 (BIND_EXPR, void_type_node, tbase,
2231 NULL_TREE, NULL_TREE);
2232 TREE_SIDE_EFFECTS (controller) = 1;
2234 body = build1 (EXIT_EXPR, void_type_node,
2235 build2 (EQ_EXPR, boolean_type_node, base, tbase));
2236 body = build_compound_expr
2237 (body, build_modify_expr (tbase, NOP_EXPR,
2238 build2 (MINUS_EXPR, ptype, tbase, size_exp)));
2239 body = build_compound_expr
2240 (body, build_delete (ptype, tbase, sfk_complete_destructor,
2241 LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 1));
2243 loop = build1 (LOOP_EXPR, void_type_node, body);
2244 loop = build_compound_expr (tbase_init, loop);
2247 /* If the delete flag is one, or anything else with the low bit set,
2248 delete the storage. */
2249 if (auto_delete_vec != sfk_base_destructor)
2253 /* The below is short by the cookie size. */
2254 virtual_size = size_binop (MULT_EXPR, size_exp,
2255 convert (sizetype, maxindex));
2257 if (! TYPE_VEC_NEW_USES_COOKIE (type))
2264 cookie_size = targetm.cxx.get_cookie_size (type);
2266 = cp_convert (ptype,
2267 cp_build_binary_op (MINUS_EXPR,
2268 cp_convert (string_type_node,
2271 /* True size with header. */
2272 virtual_size = size_binop (PLUS_EXPR, virtual_size, cookie_size);
2275 if (auto_delete_vec == sfk_deleting_destructor)
2276 deallocate_expr = build_x_delete (base_tbd,
2277 2 | use_global_delete,
2282 if (!deallocate_expr)
2285 body = deallocate_expr;
2287 body = build_compound_expr (body, deallocate_expr);
2290 body = integer_zero_node;
2292 /* Outermost wrapper: If pointer is null, punt. */
2293 body = fold (build3 (COND_EXPR, void_type_node,
2294 fold (build2 (NE_EXPR, boolean_type_node, base,
2295 convert (TREE_TYPE (base),
2296 integer_zero_node))),
2297 body, integer_zero_node));
2298 body = build1 (NOP_EXPR, void_type_node, body);
2302 TREE_OPERAND (controller, 1) = body;
2306 if (TREE_CODE (base) == SAVE_EXPR)
2307 /* Pre-evaluate the SAVE_EXPR outside of the BIND_EXPR. */
2308 body = build2 (COMPOUND_EXPR, void_type_node, base, body);
2310 return convert_to_void (body, /*implicit=*/NULL);
2313 /* Create an unnamed variable of the indicated TYPE. */
2316 create_temporary_var (tree type)
2320 decl = build_decl (VAR_DECL, NULL_TREE, type);
2321 TREE_USED (decl) = 1;
2322 DECL_ARTIFICIAL (decl) = 1;
2323 DECL_SOURCE_LOCATION (decl) = input_location;
2324 DECL_IGNORED_P (decl) = 1;
2325 DECL_CONTEXT (decl) = current_function_decl;
2330 /* Create a new temporary variable of the indicated TYPE, initialized
2333 It is not entered into current_binding_level, because that breaks
2334 things when it comes time to do final cleanups (which take place
2335 "outside" the binding contour of the function). */
2338 get_temp_regvar (tree type, tree init)
2342 decl = create_temporary_var (type);
2343 add_decl_expr (decl);
2345 finish_expr_stmt (build_modify_expr (decl, INIT_EXPR, init));
2350 /* `build_vec_init' returns tree structure that performs
2351 initialization of a vector of aggregate types.
2353 BASE is a reference to the vector, of ARRAY_TYPE.
2354 MAXINDEX is the maximum index of the array (one less than the
2355 number of elements). It is only used if
2356 TYPE_DOMAIN (TREE_TYPE (BASE)) == NULL_TREE.
2357 INIT is the (possibly NULL) initializer.
2359 FROM_ARRAY is 0 if we should init everything with INIT
2360 (i.e., every element initialized from INIT).
2361 FROM_ARRAY is 1 if we should index into INIT in parallel
2362 with initialization of DECL.
2363 FROM_ARRAY is 2 if we should index into INIT in parallel,
2364 but use assignment instead of initialization. */
2367 build_vec_init (tree base, tree maxindex, tree init, int from_array)
2370 tree base2 = NULL_TREE;
2372 tree itype = NULL_TREE;
2374 /* The type of the array. */
2375 tree atype = TREE_TYPE (base);
2376 /* The type of an element in the array. */
2377 tree type = TREE_TYPE (atype);
2378 /* The type of a pointer to an element in the array. */
2383 tree try_block = NULL_TREE;
2384 int num_initialized_elts = 0;
2387 if (TYPE_DOMAIN (atype))
2388 maxindex = array_type_nelts (atype);
2390 if (maxindex == NULL_TREE || maxindex == error_mark_node)
2391 return error_mark_node;
2395 ? (!CLASS_TYPE_P (type) || !TYPE_HAS_COMPLEX_ASSIGN_REF (type))
2396 : !TYPE_NEEDS_CONSTRUCTING (type))
2397 && ((TREE_CODE (init) == CONSTRUCTOR
2398 /* Don't do this if the CONSTRUCTOR might contain something
2399 that might throw and require us to clean up. */
2400 && (CONSTRUCTOR_ELTS (init) == NULL_TREE
2401 || ! TYPE_HAS_NONTRIVIAL_DESTRUCTOR (target_type (type))))
2404 /* Do non-default initialization of POD arrays resulting from
2405 brace-enclosed initializers. In this case, digest_init and
2406 store_constructor will handle the semantics for us. */
2408 stmt_expr = build2 (INIT_EXPR, atype, base, init);
2412 maxindex = cp_convert (ptrdiff_type_node, maxindex);
2413 ptype = build_pointer_type (type);
2414 size = size_in_bytes (type);
2415 if (TREE_CODE (TREE_TYPE (base)) == ARRAY_TYPE)
2416 base = cp_convert (ptype, decay_conversion (base));
2418 /* The code we are generating looks like:
2422 ptrdiff_t iterator = maxindex;
2424 for (; iterator != -1; --iterator) {
2425 ... initialize *t1 ...
2429 ... destroy elements that were constructed ...
2434 We can omit the try and catch blocks if we know that the
2435 initialization will never throw an exception, or if the array
2436 elements do not have destructors. We can omit the loop completely if
2437 the elements of the array do not have constructors.
2439 We actually wrap the entire body of the above in a STMT_EXPR, for
2442 When copying from array to another, when the array elements have
2443 only trivial copy constructors, we should use __builtin_memcpy
2444 rather than generating a loop. That way, we could take advantage
2445 of whatever cleverness the back-end has for dealing with copies
2446 of blocks of memory. */
2448 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
2449 destroy_temps = stmts_are_full_exprs_p ();
2450 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2451 rval = get_temp_regvar (ptype, base);
2452 base = get_temp_regvar (ptype, rval);
2453 iterator = get_temp_regvar (ptrdiff_type_node, maxindex);
2455 /* Protect the entire array initialization so that we can destroy
2456 the partially constructed array if an exception is thrown.
2457 But don't do this if we're assigning. */
2458 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2461 try_block = begin_try_block ();
2464 if (init != NULL_TREE && TREE_CODE (init) == CONSTRUCTOR)
2466 /* Do non-default initialization of non-POD arrays resulting from
2467 brace-enclosed initializers. */
2472 for (elts = CONSTRUCTOR_ELTS (init); elts; elts = TREE_CHAIN (elts))
2474 tree elt = TREE_VALUE (elts);
2475 tree baseref = build1 (INDIRECT_REF, type, base);
2477 num_initialized_elts++;
2479 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2480 if (IS_AGGR_TYPE (type) || TREE_CODE (type) == ARRAY_TYPE)
2481 finish_expr_stmt (build_aggr_init (baseref, elt, 0));
2483 finish_expr_stmt (build_modify_expr (baseref, NOP_EXPR,
2485 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2487 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base, 0));
2488 finish_expr_stmt (build_unary_op (PREDECREMENT_EXPR, iterator, 0));
2491 /* Clear out INIT so that we don't get confused below. */
2494 else if (from_array)
2496 /* If initializing one array from another, initialize element by
2497 element. We rely upon the below calls the do argument
2501 base2 = decay_conversion (init);
2502 itype = TREE_TYPE (base2);
2503 base2 = get_temp_regvar (itype, base2);
2504 itype = TREE_TYPE (itype);
2506 else if (TYPE_LANG_SPECIFIC (type)
2507 && TYPE_NEEDS_CONSTRUCTING (type)
2508 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
2510 error ("initializer ends prematurely");
2511 return error_mark_node;
2515 /* Now, default-initialize any remaining elements. We don't need to
2516 do that if a) the type does not need constructing, or b) we've
2517 already initialized all the elements.
2519 We do need to keep going if we're copying an array. */
2522 || (TYPE_NEEDS_CONSTRUCTING (type)
2523 && ! (host_integerp (maxindex, 0)
2524 && (num_initialized_elts
2525 == tree_low_cst (maxindex, 0) + 1))))
2527 /* If the ITERATOR is equal to -1, then we don't have to loop;
2528 we've already initialized all the elements. */
2532 for_stmt = begin_for_stmt ();
2533 finish_for_init_stmt (for_stmt);
2534 finish_for_cond (build2 (NE_EXPR, boolean_type_node,
2535 iterator, integer_minus_one_node),
2537 finish_for_expr (build_unary_op (PREDECREMENT_EXPR, iterator, 0),
2542 tree to = build1 (INDIRECT_REF, type, base);
2546 from = build1 (INDIRECT_REF, itype, base2);
2550 if (from_array == 2)
2551 elt_init = build_modify_expr (to, NOP_EXPR, from);
2552 else if (TYPE_NEEDS_CONSTRUCTING (type))
2553 elt_init = build_aggr_init (to, from, 0);
2555 elt_init = build_modify_expr (to, NOP_EXPR, from);
2559 else if (TREE_CODE (type) == ARRAY_TYPE)
2563 ("cannot initialize multi-dimensional array with initializer");
2564 elt_init = build_vec_init (build1 (INDIRECT_REF, type, base),
2568 elt_init = build_aggr_init (build1 (INDIRECT_REF, type, base),
2571 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2572 finish_expr_stmt (elt_init);
2573 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2575 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base, 0));
2577 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base2, 0));
2579 finish_for_stmt (for_stmt);
2582 /* Make sure to cleanup any partially constructed elements. */
2583 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2587 tree m = cp_build_binary_op (MINUS_EXPR, maxindex, iterator);
2589 /* Flatten multi-dimensional array since build_vec_delete only
2590 expects one-dimensional array. */
2591 if (TREE_CODE (type) == ARRAY_TYPE)
2593 m = cp_build_binary_op (MULT_EXPR, m,
2594 array_type_nelts_total (type));
2595 type = strip_array_types (type);
2598 finish_cleanup_try_block (try_block);
2599 e = build_vec_delete_1 (rval, m, type, sfk_base_destructor,
2600 /*use_global_delete=*/0);
2601 finish_cleanup (e, try_block);
2604 /* The value of the array initialization is the array itself, RVAL
2605 is a pointer to the first element. */
2606 finish_stmt_expr_expr (rval, stmt_expr);
2608 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
2610 /* Now convert make the result have the correct type. */
2611 atype = build_pointer_type (atype);
2612 stmt_expr = build1 (NOP_EXPR, atype, stmt_expr);
2613 stmt_expr = build_indirect_ref (stmt_expr, NULL);
2615 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
2619 /* Free up storage of type TYPE, at address ADDR.
2621 TYPE is a POINTER_TYPE and can be ptr_type_node for no special type
2624 VIRTUAL_SIZE is the amount of storage that was allocated, and is
2625 used as the second argument to operator delete. It can include
2626 things like padding and magic size cookies. It has virtual in it,
2627 because if you have a base pointer and you delete through a virtual
2628 destructor, it should be the size of the dynamic object, not the
2629 static object, see Free Store 12.5 ISO C++.
2631 This does not call any destructors. */
2634 build_x_delete (tree addr, int which_delete, tree virtual_size)
2636 int use_global_delete = which_delete & 1;
2637 int use_vec_delete = !!(which_delete & 2);
2638 enum tree_code code = use_vec_delete ? VEC_DELETE_EXPR : DELETE_EXPR;
2640 return build_op_delete_call (code, addr, virtual_size, use_global_delete,
2644 /* Call the DTOR_KIND destructor for EXP. FLAGS are as for
2648 build_dtor_call (tree exp, special_function_kind dtor_kind, int flags)
2654 case sfk_complete_destructor:
2655 name = complete_dtor_identifier;
2658 case sfk_base_destructor:
2659 name = base_dtor_identifier;
2662 case sfk_deleting_destructor:
2663 name = deleting_dtor_identifier;
2670 exp = convert_from_reference (exp);
2671 fn = lookup_fnfields (TREE_TYPE (exp), name, /*protect=*/2);
2672 return build_new_method_call (exp, fn,
2674 /*conversion_path=*/NULL_TREE,
2678 /* Generate a call to a destructor. TYPE is the type to cast ADDR to.
2679 ADDR is an expression which yields the store to be destroyed.
2680 AUTO_DELETE is the name of the destructor to call, i.e., either
2681 sfk_complete_destructor, sfk_base_destructor, or
2682 sfk_deleting_destructor.
2684 FLAGS is the logical disjunction of zero or more LOOKUP_
2685 flags. See cp-tree.h for more info. */
2688 build_delete (tree type, tree addr, special_function_kind auto_delete,
2689 int flags, int use_global_delete)
2693 if (addr == error_mark_node)
2694 return error_mark_node;
2696 /* Can happen when CURRENT_EXCEPTION_OBJECT gets its type
2697 set to `error_mark_node' before it gets properly cleaned up. */
2698 if (type == error_mark_node)
2699 return error_mark_node;
2701 type = TYPE_MAIN_VARIANT (type);
2703 if (TREE_CODE (type) == POINTER_TYPE)
2705 bool complete_p = true;
2707 type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
2708 if (TREE_CODE (type) == ARRAY_TYPE)
2711 /* We don't want to warn about delete of void*, only other
2712 incomplete types. Deleting other incomplete types
2713 invokes undefined behavior, but it is not ill-formed, so
2714 compile to something that would even do The Right Thing
2715 (TM) should the type have a trivial dtor and no delete
2717 if (!VOID_TYPE_P (type))
2719 complete_type (type);
2720 if (!COMPLETE_TYPE_P (type))
2722 warning ("possible problem detected in invocation of "
2723 "delete operator:");
2724 cxx_incomplete_type_diagnostic (addr, type, 1);
2725 inform ("neither the destructor nor the class-specific "
2726 "operator delete will be called, even if they are "
2727 "declared when the class is defined.");
2731 if (VOID_TYPE_P (type) || !complete_p || !IS_AGGR_TYPE (type))
2732 /* Call the builtin operator delete. */
2733 return build_builtin_delete_call (addr);
2734 if (TREE_SIDE_EFFECTS (addr))
2735 addr = save_expr (addr);
2737 /* Throw away const and volatile on target type of addr. */
2738 addr = convert_force (build_pointer_type (type), addr, 0);
2740 else if (TREE_CODE (type) == ARRAY_TYPE)
2744 if (TYPE_DOMAIN (type) == NULL_TREE)
2746 error ("unknown array size in delete");
2747 return error_mark_node;
2749 return build_vec_delete (addr, array_type_nelts (type),
2750 auto_delete, use_global_delete);
2754 /* Don't check PROTECT here; leave that decision to the
2755 destructor. If the destructor is accessible, call it,
2756 else report error. */
2757 addr = build_unary_op (ADDR_EXPR, addr, 0);
2758 if (TREE_SIDE_EFFECTS (addr))
2759 addr = save_expr (addr);
2761 addr = convert_force (build_pointer_type (type), addr, 0);
2764 gcc_assert (IS_AGGR_TYPE (type));
2766 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
2768 if (auto_delete != sfk_deleting_destructor)
2769 return void_zero_node;
2771 return build_op_delete_call
2772 (DELETE_EXPR, addr, cxx_sizeof_nowarn (type), use_global_delete,
2777 tree do_delete = NULL_TREE;
2780 gcc_assert (TYPE_HAS_DESTRUCTOR (type));
2782 /* For `::delete x', we must not use the deleting destructor
2783 since then we would not be sure to get the global `operator
2785 if (use_global_delete && auto_delete == sfk_deleting_destructor)
2787 /* We will use ADDR multiple times so we must save it. */
2788 addr = save_expr (addr);
2789 /* Delete the object. */
2790 do_delete = build_builtin_delete_call (addr);
2791 /* Otherwise, treat this like a complete object destructor
2793 auto_delete = sfk_complete_destructor;
2795 /* If the destructor is non-virtual, there is no deleting
2796 variant. Instead, we must explicitly call the appropriate
2797 `operator delete' here. */
2798 else if (!DECL_VIRTUAL_P (CLASSTYPE_DESTRUCTORS (type))
2799 && auto_delete == sfk_deleting_destructor)
2801 /* We will use ADDR multiple times so we must save it. */
2802 addr = save_expr (addr);
2803 /* Build the call. */
2804 do_delete = build_op_delete_call (DELETE_EXPR,
2806 cxx_sizeof_nowarn (type),
2809 /* Call the complete object destructor. */
2810 auto_delete = sfk_complete_destructor;
2812 else if (auto_delete == sfk_deleting_destructor
2813 && TYPE_GETS_REG_DELETE (type))
2815 /* Make sure we have access to the member op delete, even though
2816 we'll actually be calling it from the destructor. */
2817 build_op_delete_call (DELETE_EXPR, addr, cxx_sizeof_nowarn (type),
2818 /*global_p=*/false, NULL_TREE);
2821 expr = build_dtor_call (build_indirect_ref (addr, NULL),
2822 auto_delete, flags);
2824 expr = build2 (COMPOUND_EXPR, void_type_node, expr, do_delete);
2826 if (flags & LOOKUP_DESTRUCTOR)
2827 /* Explicit destructor call; don't check for null pointer. */
2828 ifexp = integer_one_node;
2830 /* Handle deleting a null pointer. */
2831 ifexp = fold (cp_build_binary_op (NE_EXPR, addr, integer_zero_node));
2833 if (ifexp != integer_one_node)
2834 expr = build3 (COND_EXPR, void_type_node,
2835 ifexp, expr, void_zero_node);
2841 /* At the beginning of a destructor, push cleanups that will call the
2842 destructors for our base classes and members.
2844 Called from begin_destructor_body. */
2847 push_base_cleanups (void)
2849 tree binfo, base_binfo;
2855 /* Run destructors for all virtual baseclasses. */
2856 if (CLASSTYPE_VBASECLASSES (current_class_type))
2858 tree cond = (condition_conversion
2859 (build2 (BIT_AND_EXPR, integer_type_node,
2860 current_in_charge_parm,
2861 integer_two_node)));
2863 /* The CLASSTYPE_VBASECLASSES vector is in initialization
2864 order, which is also the right order for pushing cleanups. */
2865 for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;
2866 VEC_iterate (tree, vbases, i, base_binfo); i++)
2868 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo)))
2870 expr = build_special_member_call (current_class_ref,
2871 base_dtor_identifier,
2875 | LOOKUP_NONVIRTUAL));
2876 expr = build3 (COND_EXPR, void_type_node, cond,
2877 expr, void_zero_node);
2878 finish_decl_cleanup (NULL_TREE, expr);
2883 /* Take care of the remaining baseclasses. */
2884 for (binfo = TYPE_BINFO (current_class_type), i = 0;
2885 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
2887 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo))
2888 || BINFO_VIRTUAL_P (base_binfo))
2891 expr = build_special_member_call (current_class_ref,
2892 base_dtor_identifier,
2893 NULL_TREE, base_binfo,
2894 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL);
2895 finish_decl_cleanup (NULL_TREE, expr);
2898 for (member = TYPE_FIELDS (current_class_type); member;
2899 member = TREE_CHAIN (member))
2901 if (TREE_CODE (member) != FIELD_DECL || DECL_ARTIFICIAL (member))
2903 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (member)))
2905 tree this_member = (build_class_member_access_expr
2906 (current_class_ref, member,
2907 /*access_path=*/NULL_TREE,
2908 /*preserve_reference=*/false));
2909 tree this_type = TREE_TYPE (member);
2910 expr = build_delete (this_type, this_member,
2911 sfk_complete_destructor,
2912 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR|LOOKUP_NORMAL,
2914 finish_decl_cleanup (NULL_TREE, expr);
2919 /* For type TYPE, delete the virtual baseclass objects of DECL. */
2922 build_vbase_delete (tree type, tree decl)
2928 tree addr = build_unary_op (ADDR_EXPR, decl, 0);
2930 gcc_assert (addr != error_mark_node);
2932 result = convert_to_void (integer_zero_node, NULL);
2933 for (vbases = CLASSTYPE_VBASECLASSES (type), ix = 0;
2934 VEC_iterate (tree, vbases, ix, binfo); ix++)
2936 tree base_addr = convert_force
2937 (build_pointer_type (BINFO_TYPE (binfo)), addr, 0);
2938 tree base_delete = build_delete
2939 (TREE_TYPE (base_addr), base_addr, sfk_base_destructor,
2940 LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 0);
2942 result = build_compound_expr (result, base_delete);
2947 /* Build a C++ vector delete expression.
2948 MAXINDEX is the number of elements to be deleted.
2949 ELT_SIZE is the nominal size of each element in the vector.
2950 BASE is the expression that should yield the store to be deleted.
2951 This function expands (or synthesizes) these calls itself.
2952 AUTO_DELETE_VEC says whether the container (vector) should be deallocated.
2954 This also calls delete for virtual baseclasses of elements of the vector.
2956 Update: MAXINDEX is no longer needed. The size can be extracted from the
2957 start of the vector for pointers, and from the type for arrays. We still
2958 use MAXINDEX for arrays because it happens to already have one of the
2959 values we'd have to extract. (We could use MAXINDEX with pointers to
2960 confirm the size, and trap if the numbers differ; not clear that it'd
2961 be worth bothering.) */
2964 build_vec_delete (tree base, tree maxindex,
2965 special_function_kind auto_delete_vec, int use_global_delete)
2969 tree base_init = NULL_TREE;
2971 type = TREE_TYPE (base);
2973 if (TREE_CODE (type) == POINTER_TYPE)
2975 /* Step back one from start of vector, and read dimension. */
2978 if (TREE_SIDE_EFFECTS (base))
2980 base_init = get_target_expr (base);
2981 base = TARGET_EXPR_SLOT (base_init);
2983 type = strip_array_types (TREE_TYPE (type));
2984 cookie_addr = build2 (MINUS_EXPR,
2985 build_pointer_type (sizetype),
2987 TYPE_SIZE_UNIT (sizetype));
2988 maxindex = build_indirect_ref (cookie_addr, NULL);
2990 else if (TREE_CODE (type) == ARRAY_TYPE)
2992 /* Get the total number of things in the array, maxindex is a
2994 maxindex = array_type_nelts_total (type);
2995 type = strip_array_types (type);
2996 base = build_unary_op (ADDR_EXPR, base, 1);
2997 if (TREE_SIDE_EFFECTS (base))
2999 base_init = get_target_expr (base);
3000 base = TARGET_EXPR_SLOT (base_init);
3005 if (base != error_mark_node)
3006 error ("type to vector delete is neither pointer or array type");
3007 return error_mark_node;
3010 rval = build_vec_delete_1 (base, maxindex, type, auto_delete_vec,
3013 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), base_init, rval);