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 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, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, 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_dtor_call (tree, special_function_kind, int);
56 static tree build_field_list (tree, tree, int *);
57 static tree build_vtbl_address (tree);
59 /* We are about to generate some complex initialization code.
60 Conceptually, it is all a single expression. However, we may want
61 to include conditionals, loops, and other such statement-level
62 constructs. Therefore, we build the initialization code inside a
63 statement-expression. This function starts such an expression.
64 STMT_EXPR_P and COMPOUND_STMT_P are filled in by this function;
65 pass them back to finish_init_stmts when the expression is
69 begin_init_stmts (tree *stmt_expr_p, tree *compound_stmt_p)
71 bool is_global = !building_stmt_tree ();
73 *stmt_expr_p = begin_stmt_expr ();
74 *compound_stmt_p = begin_compound_stmt (BCS_NO_SCOPE);
79 /* Finish out the statement-expression begun by the previous call to
80 begin_init_stmts. Returns the statement-expression itself. */
83 finish_init_stmts (bool is_global, tree stmt_expr, tree compound_stmt)
85 finish_compound_stmt (compound_stmt);
87 stmt_expr = finish_stmt_expr (stmt_expr, true);
89 gcc_assert (!building_stmt_tree () == is_global);
96 /* Called from initialize_vtbl_ptrs via dfs_walk. BINFO is the base
97 which we want to initialize the vtable pointer for, DATA is
98 TREE_LIST whose TREE_VALUE is the this ptr expression. */
101 dfs_initialize_vtbl_ptrs (tree binfo, void *data)
103 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
104 return dfs_skip_bases;
106 if (!BINFO_PRIMARY_P (binfo) || BINFO_VIRTUAL_P (binfo))
108 tree base_ptr = TREE_VALUE ((tree) data);
110 base_ptr = build_base_path (PLUS_EXPR, base_ptr, binfo, /*nonnull=*/1);
112 expand_virtual_init (binfo, base_ptr);
118 /* Initialize all the vtable pointers in the object pointed to by
122 initialize_vtbl_ptrs (tree addr)
127 type = TREE_TYPE (TREE_TYPE (addr));
128 list = build_tree_list (type, addr);
130 /* Walk through the hierarchy, initializing the vptr in each base
131 class. We do these in pre-order because we can't find the virtual
132 bases for a class until we've initialized the vtbl for that
134 dfs_walk_once (TYPE_BINFO (type), dfs_initialize_vtbl_ptrs, NULL, list);
137 /* Return an expression for the zero-initialization of an object with
138 type T. This expression will either be a constant (in the case
139 that T is a scalar), or a CONSTRUCTOR (in the case that T is an
140 aggregate). In either case, the value can be used as DECL_INITIAL
141 for a decl of the indicated TYPE; it is a valid static initializer.
142 If NELTS is non-NULL, and TYPE is an ARRAY_TYPE, NELTS is the
143 number of elements in the array. If STATIC_STORAGE_P is TRUE,
144 initializers are only generated for entities for which
145 zero-initialization does not simply mean filling the storage with
149 build_zero_init (tree type, tree nelts, bool static_storage_p)
151 tree init = NULL_TREE;
155 To zero-initialization storage for an object of type T means:
157 -- if T is a scalar type, the storage is set to the value of zero
160 -- if T is a non-union class type, the storage for each nonstatic
161 data member and each base-class subobject is zero-initialized.
163 -- if T is a union type, the storage for its first data member is
166 -- if T is an array type, the storage for each element is
169 -- if T is a reference type, no initialization is performed. */
171 gcc_assert (nelts == NULL_TREE || TREE_CODE (nelts) == INTEGER_CST);
173 if (type == error_mark_node)
175 else if (static_storage_p && zero_init_p (type))
176 /* In order to save space, we do not explicitly build initializers
177 for items that do not need them. GCC's semantics are that
178 items with static storage duration that are not otherwise
179 initialized are initialized to zero. */
181 else if (SCALAR_TYPE_P (type))
182 init = convert (type, integer_zero_node);
183 else if (CLASS_TYPE_P (type))
186 VEC(constructor_elt,gc) *v = NULL;
188 /* Iterate over the fields, building initializations. */
189 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
191 if (TREE_CODE (field) != FIELD_DECL)
194 /* Note that for class types there will be FIELD_DECLs
195 corresponding to base classes as well. Thus, iterating
196 over TYPE_FIELDs will result in correct initialization of
197 all of the subobjects. */
198 if (static_storage_p && !zero_init_p (TREE_TYPE (field)))
200 tree value = build_zero_init (TREE_TYPE (field),
203 CONSTRUCTOR_APPEND_ELT(v, field, value);
206 /* For unions, only the first field is initialized. */
207 if (TREE_CODE (type) == UNION_TYPE)
211 /* Build a constructor to contain the initializations. */
212 init = build_constructor (type, v);
214 else if (TREE_CODE (type) == ARRAY_TYPE)
217 VEC(constructor_elt,gc) *v = NULL;
219 /* Iterate over the array elements, building initializations. */
221 max_index = fold_build2 (MINUS_EXPR, TREE_TYPE (nelts),
222 nelts, integer_one_node);
224 max_index = array_type_nelts (type);
225 gcc_assert (TREE_CODE (max_index) == INTEGER_CST);
227 /* A zero-sized array, which is accepted as an extension, will
228 have an upper bound of -1. */
229 if (!tree_int_cst_equal (max_index, integer_minus_one_node))
233 v = VEC_alloc (constructor_elt, gc, 1);
234 ce = VEC_quick_push (constructor_elt, v, NULL);
236 /* If this is a one element array, we just use a regular init. */
237 if (tree_int_cst_equal (size_zero_node, max_index))
238 ce->index = size_zero_node;
240 ce->index = build2 (RANGE_EXPR, sizetype, size_zero_node,
243 ce->value = build_zero_init (TREE_TYPE (type),
248 /* Build a constructor to contain the initializations. */
249 init = build_constructor (type, v);
252 gcc_assert (TREE_CODE (type) == REFERENCE_TYPE);
254 /* In all cases, the initializer is a constant. */
257 TREE_CONSTANT (init) = 1;
258 TREE_INVARIANT (init) = 1;
264 /* Build an expression for the default-initialization of an object of
265 the indicated TYPE. If NELTS is non-NULL, and TYPE is an
266 ARRAY_TYPE, NELTS is the number of elements in the array. If
267 initialization of TYPE requires calling constructors, this function
268 returns NULL_TREE; the caller is responsible for arranging for the
269 constructors to be called. */
272 build_default_init (tree type, tree nelts)
276 To default-initialize an object of type T means:
278 --if T is a non-POD class type (clause _class_), the default construc-
279 tor for T is called (and the initialization is ill-formed if T has
280 no accessible default constructor);
282 --if T is an array type, each element is default-initialized;
284 --otherwise, the storage for the object is zero-initialized.
286 A program that calls for default-initialization of an entity of refer-
287 ence type is ill-formed. */
289 /* If TYPE_NEEDS_CONSTRUCTING is true, the caller is responsible for
290 performing the initialization. This is confusing in that some
291 non-PODs do not have TYPE_NEEDS_CONSTRUCTING set. (For example,
292 a class with a pointer-to-data member as a non-static data member
293 does not have TYPE_NEEDS_CONSTRUCTING set.) Therefore, we end up
294 passing non-PODs to build_zero_init below, which is contrary to
295 the semantics quoted above from [dcl.init].
297 It happens, however, that the behavior of the constructor the
298 standard says we should have generated would be precisely the
299 same as that obtained by calling build_zero_init below, so things
301 if (TYPE_NEEDS_CONSTRUCTING (type)
302 || (nelts && TREE_CODE (nelts) != INTEGER_CST))
305 /* At this point, TYPE is either a POD class type, an array of POD
306 classes, or something even more innocuous. */
307 return build_zero_init (type, nelts, /*static_storage_p=*/false);
310 /* Initialize MEMBER, a FIELD_DECL, with INIT, a TREE_LIST of
311 arguments. If TREE_LIST is void_type_node, an empty initializer
312 list was given; if NULL_TREE no initializer was given. */
315 perform_member_init (tree member, tree init)
318 tree type = TREE_TYPE (member);
321 explicit = (init != NULL_TREE);
323 /* Effective C++ rule 12 requires that all data members be
325 if (warn_ecpp && !explicit && TREE_CODE (type) != ARRAY_TYPE)
326 warning (OPT_Weffc__, "%J%qD should be initialized in the member initialization "
327 "list", current_function_decl, member);
329 if (init == void_type_node)
332 /* Get an lvalue for the data member. */
333 decl = build_class_member_access_expr (current_class_ref, member,
334 /*access_path=*/NULL_TREE,
335 /*preserve_reference=*/true);
336 if (decl == error_mark_node)
339 /* Deal with this here, as we will get confused if we try to call the
340 assignment op for an anonymous union. This can happen in a
341 synthesized copy constructor. */
342 if (ANON_AGGR_TYPE_P (type))
346 init = build2 (INIT_EXPR, type, decl, TREE_VALUE (init));
347 finish_expr_stmt (init);
350 else if (TYPE_NEEDS_CONSTRUCTING (type))
353 && TREE_CODE (type) == ARRAY_TYPE
355 && TREE_CHAIN (init) == NULL_TREE
356 && TREE_CODE (TREE_TYPE (TREE_VALUE (init))) == ARRAY_TYPE)
358 /* Initialization of one array from another. */
359 finish_expr_stmt (build_vec_init (decl, NULL_TREE, TREE_VALUE (init),
360 /*explicit_default_init_p=*/false,
364 finish_expr_stmt (build_aggr_init (decl, init, 0));
368 if (init == NULL_TREE)
372 init = build_default_init (type, /*nelts=*/NULL_TREE);
373 if (TREE_CODE (type) == REFERENCE_TYPE)
374 warning (0, "%Jdefault-initialization of %q#D, "
375 "which has reference type",
376 current_function_decl, member);
378 /* member traversal: note it leaves init NULL */
379 else if (TREE_CODE (type) == REFERENCE_TYPE)
380 pedwarn ("%Juninitialized reference member %qD",
381 current_function_decl, member);
382 else if (CP_TYPE_CONST_P (type))
383 pedwarn ("%Juninitialized member %qD with %<const%> type %qT",
384 current_function_decl, member, type);
386 else if (TREE_CODE (init) == TREE_LIST)
387 /* There was an explicit member initialization. Do some work
389 init = build_x_compound_expr_from_list (init, "member initializer");
392 finish_expr_stmt (build_modify_expr (decl, INIT_EXPR, init));
395 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
399 expr = build_class_member_access_expr (current_class_ref, member,
400 /*access_path=*/NULL_TREE,
401 /*preserve_reference=*/false);
402 expr = build_delete (type, expr, sfk_complete_destructor,
403 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
405 if (expr != error_mark_node)
406 finish_eh_cleanup (expr);
410 /* Returns a TREE_LIST containing (as the TREE_PURPOSE of each node) all
411 the FIELD_DECLs on the TYPE_FIELDS list for T, in reverse order. */
414 build_field_list (tree t, tree list, int *uses_unions_p)
420 /* Note whether or not T is a union. */
421 if (TREE_CODE (t) == UNION_TYPE)
424 for (fields = TYPE_FIELDS (t); fields; fields = TREE_CHAIN (fields))
426 /* Skip CONST_DECLs for enumeration constants and so forth. */
427 if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields))
430 /* Keep track of whether or not any fields are unions. */
431 if (TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE)
434 /* For an anonymous struct or union, we must recursively
435 consider the fields of the anonymous type. They can be
436 directly initialized from the constructor. */
437 if (ANON_AGGR_TYPE_P (TREE_TYPE (fields)))
439 /* Add this field itself. Synthesized copy constructors
440 initialize the entire aggregate. */
441 list = tree_cons (fields, NULL_TREE, list);
442 /* And now add the fields in the anonymous aggregate. */
443 list = build_field_list (TREE_TYPE (fields), list,
446 /* Add this field. */
447 else if (DECL_NAME (fields))
448 list = tree_cons (fields, NULL_TREE, list);
454 /* The MEM_INITS are a TREE_LIST. The TREE_PURPOSE of each list gives
455 a FIELD_DECL or BINFO in T that needs initialization. The
456 TREE_VALUE gives the initializer, or list of initializer arguments.
458 Return a TREE_LIST containing all of the initializations required
459 for T, in the order in which they should be performed. The output
460 list has the same format as the input. */
463 sort_mem_initializers (tree t, tree mem_inits)
466 tree base, binfo, base_binfo;
469 VEC(tree,gc) *vbases;
473 /* Build up a list of initializations. The TREE_PURPOSE of entry
474 will be the subobject (a FIELD_DECL or BINFO) to initialize. The
475 TREE_VALUE will be the constructor arguments, or NULL if no
476 explicit initialization was provided. */
477 sorted_inits = NULL_TREE;
479 /* Process the virtual bases. */
480 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
481 VEC_iterate (tree, vbases, i, base); i++)
482 sorted_inits = tree_cons (base, NULL_TREE, sorted_inits);
484 /* Process the direct bases. */
485 for (binfo = TYPE_BINFO (t), i = 0;
486 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
487 if (!BINFO_VIRTUAL_P (base_binfo))
488 sorted_inits = tree_cons (base_binfo, NULL_TREE, sorted_inits);
490 /* Process the non-static data members. */
491 sorted_inits = build_field_list (t, sorted_inits, &uses_unions_p);
492 /* Reverse the entire list of initializations, so that they are in
493 the order that they will actually be performed. */
494 sorted_inits = nreverse (sorted_inits);
496 /* If the user presented the initializers in an order different from
497 that in which they will actually occur, we issue a warning. Keep
498 track of the next subobject which can be explicitly initialized
499 without issuing a warning. */
500 next_subobject = sorted_inits;
502 /* Go through the explicit initializers, filling in TREE_PURPOSE in
504 for (init = mem_inits; init; init = TREE_CHAIN (init))
509 subobject = TREE_PURPOSE (init);
511 /* If the explicit initializers are in sorted order, then
512 SUBOBJECT will be NEXT_SUBOBJECT, or something following
514 for (subobject_init = next_subobject;
516 subobject_init = TREE_CHAIN (subobject_init))
517 if (TREE_PURPOSE (subobject_init) == subobject)
520 /* Issue a warning if the explicit initializer order does not
521 match that which will actually occur.
522 ??? Are all these on the correct lines? */
523 if (warn_reorder && !subobject_init)
525 if (TREE_CODE (TREE_PURPOSE (next_subobject)) == FIELD_DECL)
526 warning (OPT_Wreorder, "%q+D will be initialized after",
527 TREE_PURPOSE (next_subobject));
529 warning (OPT_Wreorder, "base %qT will be initialized after",
530 TREE_PURPOSE (next_subobject));
531 if (TREE_CODE (subobject) == FIELD_DECL)
532 warning (OPT_Wreorder, " %q+#D", subobject);
534 warning (OPT_Wreorder, " base %qT", subobject);
535 warning (OPT_Wreorder, "%J when initialized here", current_function_decl);
538 /* Look again, from the beginning of the list. */
541 subobject_init = sorted_inits;
542 while (TREE_PURPOSE (subobject_init) != subobject)
543 subobject_init = TREE_CHAIN (subobject_init);
546 /* It is invalid to initialize the same subobject more than
548 if (TREE_VALUE (subobject_init))
550 if (TREE_CODE (subobject) == FIELD_DECL)
551 error ("%Jmultiple initializations given for %qD",
552 current_function_decl, subobject);
554 error ("%Jmultiple initializations given for base %qT",
555 current_function_decl, subobject);
558 /* Record the initialization. */
559 TREE_VALUE (subobject_init) = TREE_VALUE (init);
560 next_subobject = subobject_init;
565 If a ctor-initializer specifies more than one mem-initializer for
566 multiple members of the same union (including members of
567 anonymous unions), the ctor-initializer is ill-formed. */
570 tree last_field = NULL_TREE;
571 for (init = sorted_inits; init; init = TREE_CHAIN (init))
577 /* Skip uninitialized members and base classes. */
578 if (!TREE_VALUE (init)
579 || TREE_CODE (TREE_PURPOSE (init)) != FIELD_DECL)
581 /* See if this field is a member of a union, or a member of a
582 structure contained in a union, etc. */
583 field = TREE_PURPOSE (init);
584 for (field_type = DECL_CONTEXT (field);
585 !same_type_p (field_type, t);
586 field_type = TYPE_CONTEXT (field_type))
587 if (TREE_CODE (field_type) == UNION_TYPE)
589 /* If this field is not a member of a union, skip it. */
590 if (TREE_CODE (field_type) != UNION_TYPE)
593 /* It's only an error if we have two initializers for the same
601 /* See if LAST_FIELD and the field initialized by INIT are
602 members of the same union. If so, there's a problem,
603 unless they're actually members of the same structure
604 which is itself a member of a union. For example, given:
606 union { struct { int i; int j; }; };
608 initializing both `i' and `j' makes sense. */
609 field_type = DECL_CONTEXT (field);
613 tree last_field_type;
615 last_field_type = DECL_CONTEXT (last_field);
618 if (same_type_p (last_field_type, field_type))
620 if (TREE_CODE (field_type) == UNION_TYPE)
621 error ("%Jinitializations for multiple members of %qT",
622 current_function_decl, last_field_type);
627 if (same_type_p (last_field_type, t))
630 last_field_type = TYPE_CONTEXT (last_field_type);
633 /* If we've reached the outermost class, then we're
635 if (same_type_p (field_type, t))
638 field_type = TYPE_CONTEXT (field_type);
649 /* Initialize all bases and members of CURRENT_CLASS_TYPE. MEM_INITS
650 is a TREE_LIST giving the explicit mem-initializer-list for the
651 constructor. The TREE_PURPOSE of each entry is a subobject (a
652 FIELD_DECL or a BINFO) of the CURRENT_CLASS_TYPE. The TREE_VALUE
653 is a TREE_LIST giving the arguments to the constructor or
654 void_type_node for an empty list of arguments. */
657 emit_mem_initializers (tree mem_inits)
659 /* We will already have issued an error message about the fact that
660 the type is incomplete. */
661 if (!COMPLETE_TYPE_P (current_class_type))
664 /* Sort the mem-initializers into the order in which the
665 initializations should be performed. */
666 mem_inits = sort_mem_initializers (current_class_type, mem_inits);
668 in_base_initializer = 1;
670 /* Initialize base classes. */
672 && TREE_CODE (TREE_PURPOSE (mem_inits)) != FIELD_DECL)
674 tree subobject = TREE_PURPOSE (mem_inits);
675 tree arguments = TREE_VALUE (mem_inits);
677 /* If these initializations are taking place in a copy
678 constructor, the base class should probably be explicitly
680 if (extra_warnings && !arguments
681 && DECL_COPY_CONSTRUCTOR_P (current_function_decl)
682 && TYPE_NEEDS_CONSTRUCTING (BINFO_TYPE (subobject)))
683 warning (OPT_Wextra, "%Jbase class %q#T should be explicitly initialized in the "
685 current_function_decl, BINFO_TYPE (subobject));
687 /* If an explicit -- but empty -- initializer list was present,
688 treat it just like default initialization at this point. */
689 if (arguments == void_type_node)
690 arguments = NULL_TREE;
692 /* Initialize the base. */
693 if (BINFO_VIRTUAL_P (subobject))
694 construct_virtual_base (subobject, arguments);
699 base_addr = build_base_path (PLUS_EXPR, current_class_ptr,
701 expand_aggr_init_1 (subobject, NULL_TREE,
702 build_indirect_ref (base_addr, NULL),
705 expand_cleanup_for_base (subobject, NULL_TREE);
708 mem_inits = TREE_CHAIN (mem_inits);
710 in_base_initializer = 0;
712 /* Initialize the vptrs. */
713 initialize_vtbl_ptrs (current_class_ptr);
715 /* Initialize the data members. */
718 perform_member_init (TREE_PURPOSE (mem_inits),
719 TREE_VALUE (mem_inits));
720 mem_inits = TREE_CHAIN (mem_inits);
724 /* Returns the address of the vtable (i.e., the value that should be
725 assigned to the vptr) for BINFO. */
728 build_vtbl_address (tree binfo)
730 tree binfo_for = binfo;
733 if (BINFO_VPTR_INDEX (binfo) && BINFO_VIRTUAL_P (binfo))
734 /* If this is a virtual primary base, then the vtable we want to store
735 is that for the base this is being used as the primary base of. We
736 can't simply skip the initialization, because we may be expanding the
737 inits of a subobject constructor where the virtual base layout
739 while (BINFO_PRIMARY_P (binfo_for))
740 binfo_for = BINFO_INHERITANCE_CHAIN (binfo_for);
742 /* Figure out what vtable BINFO's vtable is based on, and mark it as
744 vtbl = get_vtbl_decl_for_binfo (binfo_for);
745 assemble_external (vtbl);
746 TREE_USED (vtbl) = 1;
748 /* Now compute the address to use when initializing the vptr. */
749 vtbl = unshare_expr (BINFO_VTABLE (binfo_for));
750 if (TREE_CODE (vtbl) == VAR_DECL)
751 vtbl = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (vtbl)), vtbl);
756 /* This code sets up the virtual function tables appropriate for
757 the pointer DECL. It is a one-ply initialization.
759 BINFO is the exact type that DECL is supposed to be. In
760 multiple inheritance, this might mean "C's A" if C : A, B. */
763 expand_virtual_init (tree binfo, tree decl)
768 /* Compute the initializer for vptr. */
769 vtbl = build_vtbl_address (binfo);
771 /* We may get this vptr from a VTT, if this is a subobject
772 constructor or subobject destructor. */
773 vtt_index = BINFO_VPTR_INDEX (binfo);
779 /* Compute the value to use, when there's a VTT. */
780 vtt_parm = current_vtt_parm;
781 vtbl2 = build2 (PLUS_EXPR,
782 TREE_TYPE (vtt_parm),
785 vtbl2 = build_indirect_ref (vtbl2, NULL);
786 vtbl2 = convert (TREE_TYPE (vtbl), vtbl2);
788 /* The actual initializer is the VTT value only in the subobject
789 constructor. In maybe_clone_body we'll substitute NULL for
790 the vtt_parm in the case of the non-subobject constructor. */
791 vtbl = build3 (COND_EXPR,
793 build2 (EQ_EXPR, boolean_type_node,
794 current_in_charge_parm, integer_zero_node),
799 /* Compute the location of the vtpr. */
800 vtbl_ptr = build_vfield_ref (build_indirect_ref (decl, NULL),
802 gcc_assert (vtbl_ptr != error_mark_node);
804 /* Assign the vtable to the vptr. */
805 vtbl = convert_force (TREE_TYPE (vtbl_ptr), vtbl, 0);
806 finish_expr_stmt (build_modify_expr (vtbl_ptr, NOP_EXPR, vtbl));
809 /* If an exception is thrown in a constructor, those base classes already
810 constructed must be destroyed. This function creates the cleanup
811 for BINFO, which has just been constructed. If FLAG is non-NULL,
812 it is a DECL which is nonzero when this base needs to be
816 expand_cleanup_for_base (tree binfo, tree flag)
820 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (binfo)))
823 /* Call the destructor. */
824 expr = build_special_member_call (current_class_ref,
825 base_dtor_identifier,
828 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL);
830 expr = fold_build3 (COND_EXPR, void_type_node,
831 c_common_truthvalue_conversion (flag),
832 expr, integer_zero_node);
834 finish_eh_cleanup (expr);
837 /* Construct the virtual base-class VBASE passing the ARGUMENTS to its
841 construct_virtual_base (tree vbase, tree arguments)
847 /* If there are virtual base classes with destructors, we need to
848 emit cleanups to destroy them if an exception is thrown during
849 the construction process. These exception regions (i.e., the
850 period during which the cleanups must occur) begin from the time
851 the construction is complete to the end of the function. If we
852 create a conditional block in which to initialize the
853 base-classes, then the cleanup region for the virtual base begins
854 inside a block, and ends outside of that block. This situation
855 confuses the sjlj exception-handling code. Therefore, we do not
856 create a single conditional block, but one for each
857 initialization. (That way the cleanup regions always begin
858 in the outer block.) We trust the back-end to figure out
859 that the FLAG will not change across initializations, and
860 avoid doing multiple tests. */
861 flag = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl));
862 inner_if_stmt = begin_if_stmt ();
863 finish_if_stmt_cond (flag, inner_if_stmt);
865 /* Compute the location of the virtual base. If we're
866 constructing virtual bases, then we must be the most derived
867 class. Therefore, we don't have to look up the virtual base;
868 we already know where it is. */
869 exp = convert_to_base_statically (current_class_ref, vbase);
871 expand_aggr_init_1 (vbase, current_class_ref, exp, arguments,
873 finish_then_clause (inner_if_stmt);
874 finish_if_stmt (inner_if_stmt);
876 expand_cleanup_for_base (vbase, flag);
879 /* Find the context in which this FIELD can be initialized. */
882 initializing_context (tree field)
884 tree t = DECL_CONTEXT (field);
886 /* Anonymous union members can be initialized in the first enclosing
887 non-anonymous union context. */
888 while (t && ANON_AGGR_TYPE_P (t))
889 t = TYPE_CONTEXT (t);
893 /* Function to give error message if member initialization specification
894 is erroneous. FIELD is the member we decided to initialize.
895 TYPE is the type for which the initialization is being performed.
896 FIELD must be a member of TYPE.
898 MEMBER_NAME is the name of the member. */
901 member_init_ok_or_else (tree field, tree type, tree member_name)
903 if (field == error_mark_node)
907 error ("class %qT does not have any field named %qD", type,
911 if (TREE_CODE (field) == VAR_DECL)
913 error ("%q#D is a static data member; it can only be "
914 "initialized at its definition",
918 if (TREE_CODE (field) != FIELD_DECL)
920 error ("%q#D is not a non-static data member of %qT",
924 if (initializing_context (field) != type)
926 error ("class %qT does not have any field named %qD", type,
934 /* NAME is a FIELD_DECL, an IDENTIFIER_NODE which names a field, or it
935 is a _TYPE node or TYPE_DECL which names a base for that type.
936 Check the validity of NAME, and return either the base _TYPE, base
937 binfo, or the FIELD_DECL of the member. If NAME is invalid, return
938 NULL_TREE and issue a diagnostic.
940 An old style unnamed direct single base construction is permitted,
941 where NAME is NULL. */
944 expand_member_init (tree name)
949 if (!current_class_ref)
954 /* This is an obsolete unnamed base class initializer. The
955 parser will already have warned about its use. */
956 switch (BINFO_N_BASE_BINFOS (TYPE_BINFO (current_class_type)))
959 error ("unnamed initializer for %qT, which has no base classes",
963 basetype = BINFO_TYPE
964 (BINFO_BASE_BINFO (TYPE_BINFO (current_class_type), 0));
967 error ("unnamed initializer for %qT, which uses multiple inheritance",
972 else if (TYPE_P (name))
974 basetype = TYPE_MAIN_VARIANT (name);
975 name = TYPE_NAME (name);
977 else if (TREE_CODE (name) == TYPE_DECL)
978 basetype = TYPE_MAIN_VARIANT (TREE_TYPE (name));
980 basetype = NULL_TREE;
989 if (current_template_parms)
992 class_binfo = TYPE_BINFO (current_class_type);
993 direct_binfo = NULL_TREE;
994 virtual_binfo = NULL_TREE;
996 /* Look for a direct base. */
997 for (i = 0; BINFO_BASE_ITERATE (class_binfo, i, direct_binfo); ++i)
998 if (SAME_BINFO_TYPE_P (BINFO_TYPE (direct_binfo), basetype))
1001 /* Look for a virtual base -- unless the direct base is itself
1003 if (!direct_binfo || !BINFO_VIRTUAL_P (direct_binfo))
1004 virtual_binfo = binfo_for_vbase (basetype, current_class_type);
1006 /* [class.base.init]
1008 If a mem-initializer-id is ambiguous because it designates
1009 both a direct non-virtual base class and an inherited virtual
1010 base class, the mem-initializer is ill-formed. */
1011 if (direct_binfo && virtual_binfo)
1013 error ("%qD is both a direct base and an indirect virtual base",
1018 if (!direct_binfo && !virtual_binfo)
1020 if (CLASSTYPE_VBASECLASSES (current_class_type))
1021 error ("type %qT is not a direct or virtual base of %qT",
1022 basetype, current_class_type);
1024 error ("type %qT is not a direct base of %qT",
1025 basetype, current_class_type);
1029 return direct_binfo ? direct_binfo : virtual_binfo;
1033 if (TREE_CODE (name) == IDENTIFIER_NODE)
1034 field = lookup_field (current_class_type, name, 1, false);
1038 if (member_init_ok_or_else (field, current_class_type, name))
1045 /* This is like `expand_member_init', only it stores one aggregate
1048 INIT comes in two flavors: it is either a value which
1049 is to be stored in EXP, or it is a parameter list
1050 to go to a constructor, which will operate on EXP.
1051 If INIT is not a parameter list for a constructor, then set
1052 LOOKUP_ONLYCONVERTING.
1053 If FLAGS is LOOKUP_ONLYCONVERTING then it is the = init form of
1054 the initializer, if FLAGS is 0, then it is the (init) form.
1055 If `init' is a CONSTRUCTOR, then we emit a warning message,
1056 explaining that such initializations are invalid.
1058 If INIT resolves to a CALL_EXPR which happens to return
1059 something of the type we are looking for, then we know
1060 that we can safely use that call to perform the
1063 The virtual function table pointer cannot be set up here, because
1064 we do not really know its type.
1066 This never calls operator=().
1068 When initializing, nothing is CONST.
1070 A default copy constructor may have to be used to perform the
1073 A constructor or a conversion operator may have to be used to
1074 perform the initialization, but not both, as it would be ambiguous. */
1077 build_aggr_init (tree exp, tree init, int flags)
1082 tree type = TREE_TYPE (exp);
1083 int was_const = TREE_READONLY (exp);
1084 int was_volatile = TREE_THIS_VOLATILE (exp);
1087 if (init == error_mark_node)
1088 return error_mark_node;
1090 TREE_READONLY (exp) = 0;
1091 TREE_THIS_VOLATILE (exp) = 0;
1093 if (init && TREE_CODE (init) != TREE_LIST)
1094 flags |= LOOKUP_ONLYCONVERTING;
1096 if (TREE_CODE (type) == ARRAY_TYPE)
1100 /* An array may not be initialized use the parenthesized
1101 initialization form -- unless the initializer is "()". */
1102 if (init && TREE_CODE (init) == TREE_LIST)
1104 error ("bad array initializer");
1105 return error_mark_node;
1107 /* Must arrange to initialize each element of EXP
1108 from elements of INIT. */
1109 itype = init ? TREE_TYPE (init) : NULL_TREE;
1110 if (cp_type_quals (type) != TYPE_UNQUALIFIED)
1111 TREE_TYPE (exp) = TYPE_MAIN_VARIANT (type);
1112 if (itype && cp_type_quals (itype) != TYPE_UNQUALIFIED)
1113 itype = TREE_TYPE (init) = TYPE_MAIN_VARIANT (itype);
1114 stmt_expr = build_vec_init (exp, NULL_TREE, init,
1115 /*explicit_default_init_p=*/false,
1116 itype && same_type_p (itype,
1118 TREE_READONLY (exp) = was_const;
1119 TREE_THIS_VOLATILE (exp) = was_volatile;
1120 TREE_TYPE (exp) = type;
1122 TREE_TYPE (init) = itype;
1126 if (TREE_CODE (exp) == VAR_DECL || TREE_CODE (exp) == PARM_DECL)
1127 /* Just know that we've seen something for this node. */
1128 TREE_USED (exp) = 1;
1130 TREE_TYPE (exp) = TYPE_MAIN_VARIANT (type);
1131 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
1132 destroy_temps = stmts_are_full_exprs_p ();
1133 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
1134 expand_aggr_init_1 (TYPE_BINFO (type), exp, exp,
1135 init, LOOKUP_NORMAL|flags);
1136 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
1137 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
1138 TREE_TYPE (exp) = type;
1139 TREE_READONLY (exp) = was_const;
1140 TREE_THIS_VOLATILE (exp) = was_volatile;
1145 /* Like build_aggr_init, but not just for aggregates. */
1148 build_init (tree decl, tree init, int flags)
1152 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1153 expr = build_aggr_init (decl, init, flags);
1154 else if (CLASS_TYPE_P (TREE_TYPE (decl)))
1155 expr = build_special_member_call (decl, complete_ctor_identifier,
1156 build_tree_list (NULL_TREE, init),
1158 LOOKUP_NORMAL|flags);
1160 expr = build2 (INIT_EXPR, TREE_TYPE (decl), decl, init);
1166 expand_default_init (tree binfo, tree true_exp, tree exp, tree init, int flags)
1168 tree type = TREE_TYPE (exp);
1171 /* It fails because there may not be a constructor which takes
1172 its own type as the first (or only parameter), but which does
1173 take other types via a conversion. So, if the thing initializing
1174 the expression is a unit element of type X, first try X(X&),
1175 followed by initialization by X. If neither of these work
1176 out, then look hard. */
1180 if (init && TREE_CODE (init) != TREE_LIST
1181 && (flags & LOOKUP_ONLYCONVERTING))
1183 /* Base subobjects should only get direct-initialization. */
1184 gcc_assert (true_exp == exp);
1186 if (flags & DIRECT_BIND)
1187 /* Do nothing. We hit this in two cases: Reference initialization,
1188 where we aren't initializing a real variable, so we don't want
1189 to run a new constructor; and catching an exception, where we
1190 have already built up the constructor call so we could wrap it
1191 in an exception region. */;
1192 else if (BRACE_ENCLOSED_INITIALIZER_P (init))
1194 /* A brace-enclosed initializer for an aggregate. */
1195 gcc_assert (CP_AGGREGATE_TYPE_P (type));
1196 init = digest_init (type, init);
1199 init = ocp_convert (type, init, CONV_IMPLICIT|CONV_FORCE_TEMP, flags);
1201 if (TREE_CODE (init) == MUST_NOT_THROW_EXPR)
1202 /* We need to protect the initialization of a catch parm with a
1203 call to terminate(), which shows up as a MUST_NOT_THROW_EXPR
1204 around the TARGET_EXPR for the copy constructor. See
1205 initialize_handler_parm. */
1207 TREE_OPERAND (init, 0) = build2 (INIT_EXPR, TREE_TYPE (exp), exp,
1208 TREE_OPERAND (init, 0));
1209 TREE_TYPE (init) = void_type_node;
1212 init = build2 (INIT_EXPR, TREE_TYPE (exp), exp, init);
1213 TREE_SIDE_EFFECTS (init) = 1;
1214 finish_expr_stmt (init);
1218 if (init == NULL_TREE
1219 || (TREE_CODE (init) == TREE_LIST && ! TREE_TYPE (init)))
1223 init = TREE_VALUE (parms);
1226 parms = build_tree_list (NULL_TREE, init);
1228 if (true_exp == exp)
1229 ctor_name = complete_ctor_identifier;
1231 ctor_name = base_ctor_identifier;
1233 rval = build_special_member_call (exp, ctor_name, parms, binfo, flags);
1234 if (TREE_SIDE_EFFECTS (rval))
1235 finish_expr_stmt (convert_to_void (rval, NULL));
1238 /* This function is responsible for initializing EXP with INIT
1241 BINFO is the binfo of the type for who we are performing the
1242 initialization. For example, if W is a virtual base class of A and B,
1244 If we are initializing B, then W must contain B's W vtable, whereas
1245 were we initializing C, W must contain C's W vtable.
1247 TRUE_EXP is nonzero if it is the true expression being initialized.
1248 In this case, it may be EXP, or may just contain EXP. The reason we
1249 need this is because if EXP is a base element of TRUE_EXP, we
1250 don't necessarily know by looking at EXP where its virtual
1251 baseclass fields should really be pointing. But we do know
1252 from TRUE_EXP. In constructors, we don't know anything about
1253 the value being initialized.
1255 FLAGS is just passed to `build_new_method_call'. See that function
1256 for its description. */
1259 expand_aggr_init_1 (tree binfo, tree true_exp, tree exp, tree init, int flags)
1261 tree type = TREE_TYPE (exp);
1263 gcc_assert (init != error_mark_node && type != error_mark_node);
1264 gcc_assert (building_stmt_tree ());
1266 /* Use a function returning the desired type to initialize EXP for us.
1267 If the function is a constructor, and its first argument is
1268 NULL_TREE, know that it was meant for us--just slide exp on
1269 in and expand the constructor. Constructors now come
1272 if (init && TREE_CODE (exp) == VAR_DECL
1273 && COMPOUND_LITERAL_P (init))
1275 /* If store_init_value returns NULL_TREE, the INIT has been
1276 recorded as the DECL_INITIAL for EXP. That means there's
1277 nothing more we have to do. */
1278 init = store_init_value (exp, init);
1280 finish_expr_stmt (init);
1284 /* We know that expand_default_init can handle everything we want
1286 expand_default_init (binfo, true_exp, exp, init, flags);
1289 /* Report an error if TYPE is not a user-defined, aggregate type. If
1290 OR_ELSE is nonzero, give an error message. */
1293 is_aggr_type (tree type, int or_else)
1295 if (type == error_mark_node)
1298 if (! IS_AGGR_TYPE (type)
1299 && TREE_CODE (type) != TEMPLATE_TYPE_PARM
1300 && TREE_CODE (type) != BOUND_TEMPLATE_TEMPLATE_PARM)
1303 error ("%qT is not an aggregate type", type);
1310 get_type_value (tree name)
1312 if (name == error_mark_node)
1315 if (IDENTIFIER_HAS_TYPE_VALUE (name))
1316 return IDENTIFIER_TYPE_VALUE (name);
1321 /* Build a reference to a member of an aggregate. This is not a C++
1322 `&', but really something which can have its address taken, and
1323 then act as a pointer to member, for example TYPE :: FIELD can have
1324 its address taken by saying & TYPE :: FIELD. ADDRESS_P is true if
1325 this expression is the operand of "&".
1327 @@ Prints out lousy diagnostics for operator <typename>
1330 @@ This function should be rewritten and placed in search.c. */
1333 build_offset_ref (tree type, tree member, bool address_p)
1336 tree basebinfo = NULL_TREE;
1338 /* class templates can come in as TEMPLATE_DECLs here. */
1339 if (TREE_CODE (member) == TEMPLATE_DECL)
1342 if (dependent_type_p (type) || type_dependent_expression_p (member))
1343 return build_qualified_name (NULL_TREE, type, member,
1344 /*template_p=*/false);
1346 gcc_assert (TYPE_P (type));
1347 if (! is_aggr_type (type, 1))
1348 return error_mark_node;
1350 gcc_assert (DECL_P (member) || BASELINK_P (member));
1351 /* Callers should call mark_used before this point. */
1352 gcc_assert (!DECL_P (member) || TREE_USED (member));
1354 if (!COMPLETE_TYPE_P (complete_type (type))
1355 && !TYPE_BEING_DEFINED (type))
1357 error ("incomplete type %qT does not have member %qD", type, member);
1358 return error_mark_node;
1361 /* Entities other than non-static members need no further
1363 if (TREE_CODE (member) == TYPE_DECL)
1365 if (TREE_CODE (member) == VAR_DECL || TREE_CODE (member) == CONST_DECL)
1366 return convert_from_reference (member);
1368 if (TREE_CODE (member) == FIELD_DECL && DECL_C_BIT_FIELD (member))
1370 error ("invalid pointer to bit-field %qD", member);
1371 return error_mark_node;
1374 /* Set up BASEBINFO for member lookup. */
1375 decl = maybe_dummy_object (type, &basebinfo);
1377 /* A lot of this logic is now handled in lookup_member. */
1378 if (BASELINK_P (member))
1380 /* Go from the TREE_BASELINK to the member function info. */
1381 tree fnfields = member;
1382 tree t = BASELINK_FUNCTIONS (fnfields);
1384 if (TREE_CODE (t) != TEMPLATE_ID_EXPR && !really_overloaded_fn (t))
1386 /* Get rid of a potential OVERLOAD around it. */
1387 t = OVL_CURRENT (t);
1389 /* Unique functions are handled easily. */
1391 /* For non-static member of base class, we need a special rule
1392 for access checking [class.protected]:
1394 If the access is to form a pointer to member, the
1395 nested-name-specifier shall name the derived class
1396 (or any class derived from that class). */
1397 if (address_p && DECL_P (t)
1398 && DECL_NONSTATIC_MEMBER_P (t))
1399 perform_or_defer_access_check (TYPE_BINFO (type), t);
1401 perform_or_defer_access_check (basebinfo, t);
1403 if (DECL_STATIC_FUNCTION_P (t))
1409 TREE_TYPE (fnfields) = unknown_type_node;
1413 else if (address_p && TREE_CODE (member) == FIELD_DECL)
1414 /* We need additional test besides the one in
1415 check_accessibility_of_qualified_id in case it is
1416 a pointer to non-static member. */
1417 perform_or_defer_access_check (TYPE_BINFO (type), member);
1421 /* If MEMBER is non-static, then the program has fallen afoul of
1424 An id-expression that denotes a nonstatic data member or
1425 nonstatic member function of a class can only be used:
1427 -- as part of a class member access (_expr.ref_) in which the
1428 object-expression refers to the member's class or a class
1429 derived from that class, or
1431 -- to form a pointer to member (_expr.unary.op_), or
1433 -- in the body of a nonstatic member function of that class or
1434 of a class derived from that class (_class.mfct.nonstatic_), or
1436 -- in a mem-initializer for a constructor for that class or for
1437 a class derived from that class (_class.base.init_). */
1438 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (member))
1440 /* Build a representation of a the qualified name suitable
1441 for use as the operand to "&" -- even though the "&" is
1442 not actually present. */
1443 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1444 /* In Microsoft mode, treat a non-static member function as if
1445 it were a pointer-to-member. */
1446 if (flag_ms_extensions)
1448 PTRMEM_OK_P (member) = 1;
1449 return build_unary_op (ADDR_EXPR, member, 0);
1451 error ("invalid use of non-static member function %qD",
1452 TREE_OPERAND (member, 1));
1455 else if (TREE_CODE (member) == FIELD_DECL)
1457 error ("invalid use of non-static data member %qD", member);
1458 return error_mark_node;
1463 member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member);
1464 PTRMEM_OK_P (member) = 1;
1468 /* If DECL is a scalar enumeration constant or variable with a
1469 constant initializer, return the initializer (or, its initializers,
1470 recursively); otherwise, return DECL. If INTEGRAL_P, the
1471 initializer is only returned if DECL is an integral
1472 constant-expression. */
1475 constant_value_1 (tree decl, bool integral_p)
1477 while (TREE_CODE (decl) == CONST_DECL
1479 ? DECL_INTEGRAL_CONSTANT_VAR_P (decl)
1480 : (TREE_CODE (decl) == VAR_DECL
1481 && CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (decl)))))
1484 /* Static data members in template classes may have
1485 non-dependent initializers. References to such non-static
1486 data members are not value-dependent, so we must retrieve the
1487 initializer here. The DECL_INITIAL will have the right type,
1488 but will not have been folded because that would prevent us
1489 from performing all appropriate semantic checks at
1490 instantiation time. */
1491 if (DECL_CLASS_SCOPE_P (decl)
1492 && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (decl))
1493 && uses_template_parms (CLASSTYPE_TI_ARGS
1494 (DECL_CONTEXT (decl))))
1496 ++processing_template_decl;
1497 init = fold_non_dependent_expr (DECL_INITIAL (decl));
1498 --processing_template_decl;
1502 /* If DECL is a static data member in a template
1503 specialization, we must instantiate it here. The
1504 initializer for the static data member is not processed
1505 until needed; we need it now. */
1507 init = DECL_INITIAL (decl);
1509 if (init == error_mark_node)
1510 return error_mark_node;
1512 || !TREE_TYPE (init)
1514 ? !INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (init))
1515 : (!TREE_CONSTANT (init)
1516 /* Do not return an aggregate constant (of which
1517 string literals are a special case), as we do not
1518 want to make inadvertent copies of such entities,
1519 and we must be sure that their addresses are the
1521 || TREE_CODE (init) == CONSTRUCTOR
1522 || TREE_CODE (init) == STRING_CST)))
1524 decl = unshare_expr (init);
1529 /* If DECL is a CONST_DECL, or a constant VAR_DECL initialized by
1530 constant of integral or enumeration type, then return that value.
1531 These are those variables permitted in constant expressions by
1535 integral_constant_value (tree decl)
1537 return constant_value_1 (decl, /*integral_p=*/true);
1540 /* A more relaxed version of integral_constant_value, used by the
1541 common C/C++ code and by the C++ front-end for optimization
1545 decl_constant_value (tree decl)
1547 return constant_value_1 (decl,
1548 /*integral_p=*/processing_template_decl);
1551 /* Common subroutines of build_new and build_vec_delete. */
1553 /* Call the global __builtin_delete to delete ADDR. */
1556 build_builtin_delete_call (tree addr)
1558 mark_used (global_delete_fndecl);
1559 return build_call (global_delete_fndecl, build_tree_list (NULL_TREE, addr));
1562 /* Build and return a NEW_EXPR. If NELTS is non-NULL, TYPE[NELTS] is
1563 the type of the object being allocated; otherwise, it's just TYPE.
1564 INIT is the initializer, if any. USE_GLOBAL_NEW is true if the
1565 user explicitly wrote "::operator new". PLACEMENT, if non-NULL, is
1566 the TREE_LIST of arguments to be provided as arguments to a
1567 placement new operator. This routine performs no semantic checks;
1568 it just creates and returns a NEW_EXPR. */
1571 build_raw_new_expr (tree placement, tree type, tree nelts, tree init,
1576 new_expr = build4 (NEW_EXPR, build_pointer_type (type), placement, type,
1578 NEW_EXPR_USE_GLOBAL (new_expr) = use_global_new;
1579 TREE_SIDE_EFFECTS (new_expr) = 1;
1584 /* Generate code for a new-expression, including calling the "operator
1585 new" function, initializing the object, and, if an exception occurs
1586 during construction, cleaning up. The arguments are as for
1587 build_raw_new_expr. */
1590 build_new_1 (tree placement, tree type, tree nelts, tree init,
1591 bool globally_qualified_p)
1595 /* True iff this is a call to "operator new[]" instead of just
1597 bool array_p = false;
1598 /* True iff ARRAY_P is true and the bound of the array type is
1599 not necessarily a compile time constant. For example, VLA_P is
1600 true for "new int[f()]". */
1602 /* The type being allocated. If ARRAY_P is true, this will be an
1605 /* If ARRAY_P is true, the element type of the array. This is an
1606 never ARRAY_TYPE; for something like "new int[3][4]", the
1607 ELT_TYPE is "int". If ARRAY_P is false, this is the same type as
1610 /* The type of the new-expression. (This type is always a pointer
1613 /* A pointer type pointing to the FULL_TYPE. */
1614 tree full_pointer_type;
1615 tree outer_nelts = NULL_TREE;
1616 tree alloc_call, alloc_expr;
1617 /* The address returned by the call to "operator new". This node is
1618 a VAR_DECL and is therefore reusable. */
1621 tree cookie_expr, init_expr;
1622 int nothrow, check_new;
1623 int use_java_new = 0;
1624 /* If non-NULL, the number of extra bytes to allocate at the
1625 beginning of the storage allocated for an array-new expression in
1626 order to store the number of elements. */
1627 tree cookie_size = NULL_TREE;
1628 /* True if the function we are calling is a placement allocation
1630 bool placement_allocation_fn_p;
1631 tree args = NULL_TREE;
1632 /* True if the storage must be initialized, either by a constructor
1633 or due to an explicit new-initializer. */
1634 bool is_initialized;
1635 /* The address of the thing allocated, not including any cookie. In
1636 particular, if an array cookie is in use, DATA_ADDR is the
1637 address of the first array element. This node is a VAR_DECL, and
1638 is therefore reusable. */
1640 tree init_preeval_expr = NULL_TREE;
1646 outer_nelts = nelts;
1649 /* ??? The middle-end will error on us for building a VLA outside a
1650 function context. Methinks that's not it's purvey. So we'll do
1651 our own VLA layout later. */
1653 full_type = build_cplus_array_type (type, NULL_TREE);
1654 index = convert (sizetype, nelts);
1655 index = size_binop (MINUS_EXPR, index, size_one_node);
1656 TYPE_DOMAIN (full_type) = build_index_type (index);
1661 if (TREE_CODE (type) == ARRAY_TYPE)
1664 nelts = array_type_nelts_top (type);
1665 outer_nelts = nelts;
1666 type = TREE_TYPE (type);
1670 if (!complete_type_or_else (type, NULL_TREE))
1671 return error_mark_node;
1673 /* If our base type is an array, then make sure we know how many elements
1675 for (elt_type = type;
1676 TREE_CODE (elt_type) == ARRAY_TYPE;
1677 elt_type = TREE_TYPE (elt_type))
1678 nelts = cp_build_binary_op (MULT_EXPR, nelts,
1679 array_type_nelts_top (elt_type));
1681 if (TREE_CODE (elt_type) == VOID_TYPE)
1683 error ("invalid type %<void%> for new");
1684 return error_mark_node;
1687 if (abstract_virtuals_error (NULL_TREE, elt_type))
1688 return error_mark_node;
1690 is_initialized = (TYPE_NEEDS_CONSTRUCTING (elt_type) || init);
1691 if (CP_TYPE_CONST_P (elt_type) && !is_initialized)
1693 error ("uninitialized const in %<new%> of %q#T", elt_type);
1694 return error_mark_node;
1697 size = size_in_bytes (elt_type);
1700 size = size_binop (MULT_EXPR, size, convert (sizetype, nelts));
1705 /* Do our own VLA layout. Setting TYPE_SIZE/_UNIT is
1706 necessary in order for the <INIT_EXPR <*foo> <CONSTRUCTOR
1707 ...>> to be valid. */
1708 TYPE_SIZE_UNIT (full_type) = size;
1709 n = convert (bitsizetype, nelts);
1710 bitsize = size_binop (MULT_EXPR, TYPE_SIZE (elt_type), n);
1711 TYPE_SIZE (full_type) = bitsize;
1715 alloc_fn = NULL_TREE;
1717 /* Allocate the object. */
1718 if (! placement && TYPE_FOR_JAVA (elt_type))
1721 tree class_decl = build_java_class_ref (elt_type);
1722 static const char alloc_name[] = "_Jv_AllocObject";
1725 if (!get_global_value_if_present (get_identifier (alloc_name),
1728 error ("call to Java constructor with %qs undefined", alloc_name);
1729 return error_mark_node;
1731 else if (really_overloaded_fn (alloc_fn))
1733 error ("%qD should never be overloaded", alloc_fn);
1734 return error_mark_node;
1736 alloc_fn = OVL_CURRENT (alloc_fn);
1737 class_addr = build1 (ADDR_EXPR, jclass_node, class_decl);
1738 alloc_call = (build_function_call
1740 build_tree_list (NULL_TREE, class_addr)));
1747 fnname = ansi_opname (array_p ? VEC_NEW_EXPR : NEW_EXPR);
1749 if (!globally_qualified_p
1750 && CLASS_TYPE_P (elt_type)
1752 ? TYPE_HAS_ARRAY_NEW_OPERATOR (elt_type)
1753 : TYPE_HAS_NEW_OPERATOR (elt_type)))
1755 /* Use a class-specific operator new. */
1756 /* If a cookie is required, add some extra space. */
1757 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1759 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1760 size = size_binop (PLUS_EXPR, size, cookie_size);
1762 /* Create the argument list. */
1763 args = tree_cons (NULL_TREE, size, placement);
1764 /* Do name-lookup to find the appropriate operator. */
1765 fns = lookup_fnfields (elt_type, fnname, /*protect=*/2);
1766 if (fns == NULL_TREE)
1768 error ("no suitable %qD found in class %qT", fnname, elt_type);
1769 return error_mark_node;
1771 if (TREE_CODE (fns) == TREE_LIST)
1773 error ("request for member %qD is ambiguous", fnname);
1774 print_candidates (fns);
1775 return error_mark_node;
1777 alloc_call = build_new_method_call (build_dummy_object (elt_type),
1779 /*conversion_path=*/NULL_TREE,
1785 /* Use a global operator new. */
1786 /* See if a cookie might be required. */
1787 if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type))
1788 cookie_size = targetm.cxx.get_cookie_size (elt_type);
1790 cookie_size = NULL_TREE;
1792 alloc_call = build_operator_new_call (fnname, placement,
1793 &size, &cookie_size,
1798 if (alloc_call == error_mark_node)
1799 return error_mark_node;
1801 gcc_assert (alloc_fn != NULL_TREE);
1803 /* In the simple case, we can stop now. */
1804 pointer_type = build_pointer_type (type);
1805 if (!cookie_size && !is_initialized)
1806 return build_nop (pointer_type, alloc_call);
1808 /* While we're working, use a pointer to the type we've actually
1809 allocated. Store the result of the call in a variable so that we
1810 can use it more than once. */
1811 full_pointer_type = build_pointer_type (full_type);
1812 alloc_expr = get_target_expr (build_nop (full_pointer_type, alloc_call));
1813 alloc_node = TARGET_EXPR_SLOT (alloc_expr);
1815 /* Strip any COMPOUND_EXPRs from ALLOC_CALL. */
1816 while (TREE_CODE (alloc_call) == COMPOUND_EXPR)
1817 alloc_call = TREE_OPERAND (alloc_call, 1);
1819 /* Now, check to see if this function is actually a placement
1820 allocation function. This can happen even when PLACEMENT is NULL
1821 because we might have something like:
1823 struct S { void* operator new (size_t, int i = 0); };
1825 A call to `new S' will get this allocation function, even though
1826 there is no explicit placement argument. If there is more than
1827 one argument, or there are variable arguments, then this is a
1828 placement allocation function. */
1829 placement_allocation_fn_p
1830 = (type_num_arguments (TREE_TYPE (alloc_fn)) > 1
1831 || varargs_function_p (alloc_fn));
1833 /* Preevaluate the placement args so that we don't reevaluate them for a
1834 placement delete. */
1835 if (placement_allocation_fn_p)
1838 stabilize_call (alloc_call, &inits);
1840 alloc_expr = build2 (COMPOUND_EXPR, TREE_TYPE (alloc_expr), inits,
1844 /* unless an allocation function is declared with an empty excep-
1845 tion-specification (_except.spec_), throw(), it indicates failure to
1846 allocate storage by throwing a bad_alloc exception (clause _except_,
1847 _lib.bad.alloc_); it returns a non-null pointer otherwise If the allo-
1848 cation function is declared with an empty exception-specification,
1849 throw(), it returns null to indicate failure to allocate storage and a
1850 non-null pointer otherwise.
1852 So check for a null exception spec on the op new we just called. */
1854 nothrow = TYPE_NOTHROW_P (TREE_TYPE (alloc_fn));
1855 check_new = (flag_check_new || nothrow) && ! use_java_new;
1862 /* Adjust so we're pointing to the start of the object. */
1863 data_addr = get_target_expr (build2 (PLUS_EXPR, full_pointer_type,
1864 alloc_node, cookie_size));
1866 /* Store the number of bytes allocated so that we can know how
1867 many elements to destroy later. We use the last sizeof
1868 (size_t) bytes to store the number of elements. */
1869 cookie_ptr = build2 (MINUS_EXPR, build_pointer_type (sizetype),
1870 data_addr, size_in_bytes (sizetype));
1871 cookie = build_indirect_ref (cookie_ptr, NULL);
1873 cookie_expr = build2 (MODIFY_EXPR, sizetype, cookie, nelts);
1875 if (targetm.cxx.cookie_has_size ())
1877 /* Also store the element size. */
1878 cookie_ptr = build2 (MINUS_EXPR, build_pointer_type (sizetype),
1879 cookie_ptr, size_in_bytes (sizetype));
1880 cookie = build_indirect_ref (cookie_ptr, NULL);
1881 cookie = build2 (MODIFY_EXPR, sizetype, cookie,
1882 size_in_bytes(elt_type));
1883 cookie_expr = build2 (COMPOUND_EXPR, TREE_TYPE (cookie_expr),
1884 cookie, cookie_expr);
1886 data_addr = TARGET_EXPR_SLOT (data_addr);
1890 cookie_expr = NULL_TREE;
1891 data_addr = alloc_node;
1894 /* Now initialize the allocated object. Note that we preevaluate the
1895 initialization expression, apart from the actual constructor call or
1896 assignment--we do this because we want to delay the allocation as long
1897 as possible in order to minimize the size of the exception region for
1898 placement delete. */
1903 init_expr = build_indirect_ref (data_addr, NULL);
1907 bool explicit_default_init_p = false;
1909 if (init == void_zero_node)
1912 explicit_default_init_p = true;
1915 pedwarn ("ISO C++ forbids initialization in array new");
1918 = build_vec_init (init_expr,
1919 cp_build_binary_op (MINUS_EXPR, outer_nelts,
1922 explicit_default_init_p,
1925 /* An array initialization is stable because the initialization
1926 of each element is a full-expression, so the temporaries don't
1932 if (init == void_zero_node)
1933 init = build_default_init (full_type, nelts);
1935 if (TYPE_NEEDS_CONSTRUCTING (type))
1937 init_expr = build_special_member_call (init_expr,
1938 complete_ctor_identifier,
1941 stable = stabilize_init (init_expr, &init_preeval_expr);
1945 /* We are processing something like `new int (10)', which
1946 means allocate an int, and initialize it with 10. */
1948 if (TREE_CODE (init) == TREE_LIST)
1949 init = build_x_compound_expr_from_list (init,
1952 gcc_assert (TREE_CODE (init) != CONSTRUCTOR
1953 || TREE_TYPE (init) != NULL_TREE);
1955 init_expr = build_modify_expr (init_expr, INIT_EXPR, init);
1956 stable = stabilize_init (init_expr, &init_preeval_expr);
1960 if (init_expr == error_mark_node)
1961 return error_mark_node;
1963 /* If any part of the object initialization terminates by throwing an
1964 exception and a suitable deallocation function can be found, the
1965 deallocation function is called to free the memory in which the
1966 object was being constructed, after which the exception continues
1967 to propagate in the context of the new-expression. If no
1968 unambiguous matching deallocation function can be found,
1969 propagating the exception does not cause the object's memory to be
1971 if (flag_exceptions && ! use_java_new)
1973 enum tree_code dcode = array_p ? VEC_DELETE_EXPR : DELETE_EXPR;
1976 /* The Standard is unclear here, but the right thing to do
1977 is to use the same method for finding deallocation
1978 functions that we use for finding allocation functions. */
1979 cleanup = build_op_delete_call (dcode, alloc_node, size,
1980 globally_qualified_p,
1981 (placement_allocation_fn_p
1982 ? alloc_call : NULL_TREE),
1983 (placement_allocation_fn_p
1984 ? alloc_fn : NULL_TREE));
1989 /* This is much simpler if we were able to preevaluate all of
1990 the arguments to the constructor call. */
1991 init_expr = build2 (TRY_CATCH_EXPR, void_type_node,
1992 init_expr, cleanup);
1994 /* Ack! First we allocate the memory. Then we set our sentry
1995 variable to true, and expand a cleanup that deletes the
1996 memory if sentry is true. Then we run the constructor, and
1997 finally clear the sentry.
1999 We need to do this because we allocate the space first, so
2000 if there are any temporaries with cleanups in the
2001 constructor args and we weren't able to preevaluate them, we
2002 need this EH region to extend until end of full-expression
2003 to preserve nesting. */
2005 tree end, sentry, begin;
2007 begin = get_target_expr (boolean_true_node);
2008 CLEANUP_EH_ONLY (begin) = 1;
2010 sentry = TARGET_EXPR_SLOT (begin);
2012 TARGET_EXPR_CLEANUP (begin)
2013 = build3 (COND_EXPR, void_type_node, sentry,
2014 cleanup, void_zero_node);
2016 end = build2 (MODIFY_EXPR, TREE_TYPE (sentry),
2017 sentry, boolean_false_node);
2020 = build2 (COMPOUND_EXPR, void_type_node, begin,
2021 build2 (COMPOUND_EXPR, void_type_node, init_expr,
2028 init_expr = NULL_TREE;
2030 /* Now build up the return value in reverse order. */
2035 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_expr, rval);
2037 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), cookie_expr, rval);
2039 if (rval == alloc_node)
2040 /* If we don't have an initializer or a cookie, strip the TARGET_EXPR
2041 and return the call (which doesn't need to be adjusted). */
2042 rval = TARGET_EXPR_INITIAL (alloc_expr);
2047 tree ifexp = cp_build_binary_op (NE_EXPR, alloc_node,
2049 rval = build_conditional_expr (ifexp, rval, alloc_node);
2052 /* Perform the allocation before anything else, so that ALLOC_NODE
2053 has been initialized before we start using it. */
2054 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), alloc_expr, rval);
2057 if (init_preeval_expr)
2058 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_preeval_expr, rval);
2060 /* Convert to the final type. */
2061 rval = build_nop (pointer_type, rval);
2063 /* A new-expression is never an lvalue. */
2064 rval = rvalue (rval);
2069 /* Generate a representation for a C++ "new" expression. PLACEMENT is
2070 a TREE_LIST of placement-new arguments (or NULL_TREE if none). If
2071 NELTS is NULL, TYPE is the type of the storage to be allocated. If
2072 NELTS is not NULL, then this is an array-new allocation; TYPE is
2073 the type of the elements in the array and NELTS is the number of
2074 elements in the array. INIT, if non-NULL, is the initializer for
2075 the new object, or void_zero_node to indicate an initializer of
2076 "()". If USE_GLOBAL_NEW is true, then the user explicitly wrote
2077 "::new" rather than just "new". */
2080 build_new (tree placement, tree type, tree nelts, tree init,
2084 tree orig_placement;
2088 if (type == error_mark_node)
2089 return error_mark_node;
2091 orig_placement = placement;
2095 if (processing_template_decl)
2097 if (dependent_type_p (type)
2098 || any_type_dependent_arguments_p (placement)
2099 || (nelts && type_dependent_expression_p (nelts))
2100 || (init != void_zero_node
2101 && any_type_dependent_arguments_p (init)))
2102 return build_raw_new_expr (placement, type, nelts, init,
2104 placement = build_non_dependent_args (placement);
2106 nelts = build_non_dependent_expr (nelts);
2107 if (init != void_zero_node)
2108 init = build_non_dependent_args (init);
2113 if (!build_expr_type_conversion (WANT_INT | WANT_ENUM, nelts, false))
2114 pedwarn ("size in array new must have integral type");
2115 nelts = save_expr (cp_convert (sizetype, nelts));
2116 if (nelts == integer_zero_node)
2117 warning (0, "zero size array reserves no space");
2120 /* ``A reference cannot be created by the new operator. A reference
2121 is not an object (8.2.2, 8.4.3), so a pointer to it could not be
2122 returned by new.'' ARM 5.3.3 */
2123 if (TREE_CODE (type) == REFERENCE_TYPE)
2125 error ("new cannot be applied to a reference type");
2126 type = TREE_TYPE (type);
2129 if (TREE_CODE (type) == FUNCTION_TYPE)
2131 error ("new cannot be applied to a function type");
2132 return error_mark_node;
2135 rval = build_new_1 (placement, type, nelts, init, use_global_new);
2136 if (rval == error_mark_node)
2137 return error_mark_node;
2139 if (processing_template_decl)
2140 return build_raw_new_expr (orig_placement, type, orig_nelts, orig_init,
2143 /* Wrap it in a NOP_EXPR so warn_if_unused_value doesn't complain. */
2144 rval = build1 (NOP_EXPR, TREE_TYPE (rval), rval);
2145 TREE_NO_WARNING (rval) = 1;
2150 /* Given a Java class, return a decl for the corresponding java.lang.Class. */
2153 build_java_class_ref (tree type)
2155 tree name = NULL_TREE, class_decl;
2156 static tree CL_suffix = NULL_TREE;
2157 if (CL_suffix == NULL_TREE)
2158 CL_suffix = get_identifier("class$");
2159 if (jclass_node == NULL_TREE)
2161 jclass_node = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass"));
2162 if (jclass_node == NULL_TREE)
2163 fatal_error ("call to Java constructor, while %<jclass%> undefined");
2165 jclass_node = TREE_TYPE (jclass_node);
2168 /* Mangle the class$ field. */
2171 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
2172 if (DECL_NAME (field) == CL_suffix)
2174 mangle_decl (field);
2175 name = DECL_ASSEMBLER_NAME (field);
2179 internal_error ("can't find class$");
2182 class_decl = IDENTIFIER_GLOBAL_VALUE (name);
2183 if (class_decl == NULL_TREE)
2185 class_decl = build_decl (VAR_DECL, name, TREE_TYPE (jclass_node));
2186 TREE_STATIC (class_decl) = 1;
2187 DECL_EXTERNAL (class_decl) = 1;
2188 TREE_PUBLIC (class_decl) = 1;
2189 DECL_ARTIFICIAL (class_decl) = 1;
2190 DECL_IGNORED_P (class_decl) = 1;
2191 pushdecl_top_level (class_decl);
2192 make_decl_rtl (class_decl);
2198 build_vec_delete_1 (tree base, tree maxindex, tree type,
2199 special_function_kind auto_delete_vec, int use_global_delete)
2202 tree ptype = build_pointer_type (type = complete_type (type));
2203 tree size_exp = size_in_bytes (type);
2205 /* Temporary variables used by the loop. */
2206 tree tbase, tbase_init;
2208 /* This is the body of the loop that implements the deletion of a
2209 single element, and moves temp variables to next elements. */
2212 /* This is the LOOP_EXPR that governs the deletion of the elements. */
2215 /* This is the thing that governs what to do after the loop has run. */
2216 tree deallocate_expr = 0;
2218 /* This is the BIND_EXPR which holds the outermost iterator of the
2219 loop. It is convenient to set this variable up and test it before
2220 executing any other code in the loop.
2221 This is also the containing expression returned by this function. */
2222 tree controller = NULL_TREE;
2224 /* We should only have 1-D arrays here. */
2225 gcc_assert (TREE_CODE (type) != ARRAY_TYPE);
2227 if (! IS_AGGR_TYPE (type) || TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
2230 /* The below is short by the cookie size. */
2231 virtual_size = size_binop (MULT_EXPR, size_exp,
2232 convert (sizetype, maxindex));
2234 tbase = create_temporary_var (ptype);
2235 tbase_init = build_modify_expr (tbase, NOP_EXPR,
2236 fold_build2 (PLUS_EXPR, ptype,
2239 DECL_REGISTER (tbase) = 1;
2240 controller = build3 (BIND_EXPR, void_type_node, tbase,
2241 NULL_TREE, NULL_TREE);
2242 TREE_SIDE_EFFECTS (controller) = 1;
2244 body = build1 (EXIT_EXPR, void_type_node,
2245 build2 (EQ_EXPR, boolean_type_node, tbase,
2246 fold_convert (ptype, base)));
2247 body = build_compound_expr
2248 (body, build_modify_expr (tbase, NOP_EXPR,
2249 build2 (MINUS_EXPR, ptype, tbase, size_exp)));
2250 body = build_compound_expr
2251 (body, build_delete (ptype, tbase, sfk_complete_destructor,
2252 LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 1));
2254 loop = build1 (LOOP_EXPR, void_type_node, body);
2255 loop = build_compound_expr (tbase_init, loop);
2258 /* If the delete flag is one, or anything else with the low bit set,
2259 delete the storage. */
2260 if (auto_delete_vec != sfk_base_destructor)
2264 /* The below is short by the cookie size. */
2265 virtual_size = size_binop (MULT_EXPR, size_exp,
2266 convert (sizetype, maxindex));
2268 if (! TYPE_VEC_NEW_USES_COOKIE (type))
2275 cookie_size = targetm.cxx.get_cookie_size (type);
2277 = cp_convert (ptype,
2278 cp_build_binary_op (MINUS_EXPR,
2279 cp_convert (string_type_node,
2282 /* True size with header. */
2283 virtual_size = size_binop (PLUS_EXPR, virtual_size, cookie_size);
2286 if (auto_delete_vec == sfk_deleting_destructor)
2287 deallocate_expr = build_op_delete_call (VEC_DELETE_EXPR,
2288 base_tbd, virtual_size,
2289 use_global_delete & 1,
2290 /*placement=*/NULL_TREE,
2291 /*alloc_fn=*/NULL_TREE);
2295 if (!deallocate_expr)
2298 body = deallocate_expr;
2300 body = build_compound_expr (body, deallocate_expr);
2303 body = integer_zero_node;
2305 /* Outermost wrapper: If pointer is null, punt. */
2306 body = fold_build3 (COND_EXPR, void_type_node,
2307 fold_build2 (NE_EXPR, boolean_type_node, base,
2308 convert (TREE_TYPE (base),
2309 integer_zero_node)),
2310 body, integer_zero_node);
2311 body = build1 (NOP_EXPR, void_type_node, body);
2315 TREE_OPERAND (controller, 1) = body;
2319 if (TREE_CODE (base) == SAVE_EXPR)
2320 /* Pre-evaluate the SAVE_EXPR outside of the BIND_EXPR. */
2321 body = build2 (COMPOUND_EXPR, void_type_node, base, body);
2323 return convert_to_void (body, /*implicit=*/NULL);
2326 /* Create an unnamed variable of the indicated TYPE. */
2329 create_temporary_var (tree type)
2333 decl = build_decl (VAR_DECL, NULL_TREE, type);
2334 TREE_USED (decl) = 1;
2335 DECL_ARTIFICIAL (decl) = 1;
2336 DECL_IGNORED_P (decl) = 1;
2337 DECL_SOURCE_LOCATION (decl) = input_location;
2338 DECL_CONTEXT (decl) = current_function_decl;
2343 /* Create a new temporary variable of the indicated TYPE, initialized
2346 It is not entered into current_binding_level, because that breaks
2347 things when it comes time to do final cleanups (which take place
2348 "outside" the binding contour of the function). */
2351 get_temp_regvar (tree type, tree init)
2355 decl = create_temporary_var (type);
2356 add_decl_expr (decl);
2358 finish_expr_stmt (build_modify_expr (decl, INIT_EXPR, init));
2363 /* `build_vec_init' returns tree structure that performs
2364 initialization of a vector of aggregate types.
2366 BASE is a reference to the vector, of ARRAY_TYPE.
2367 MAXINDEX is the maximum index of the array (one less than the
2368 number of elements). It is only used if
2369 TYPE_DOMAIN (TREE_TYPE (BASE)) == NULL_TREE.
2371 INIT is the (possibly NULL) initializer.
2373 If EXPLICIT_DEFAULT_INIT_P is true, then INIT must be NULL. All
2374 elements in the array are default-initialized.
2376 FROM_ARRAY is 0 if we should init everything with INIT
2377 (i.e., every element initialized from INIT).
2378 FROM_ARRAY is 1 if we should index into INIT in parallel
2379 with initialization of DECL.
2380 FROM_ARRAY is 2 if we should index into INIT in parallel,
2381 but use assignment instead of initialization. */
2384 build_vec_init (tree base, tree maxindex, tree init,
2385 bool explicit_default_init_p,
2389 tree base2 = NULL_TREE;
2391 tree itype = NULL_TREE;
2393 /* The type of the array. */
2394 tree atype = TREE_TYPE (base);
2395 /* The type of an element in the array. */
2396 tree type = TREE_TYPE (atype);
2397 /* The element type reached after removing all outer array
2399 tree inner_elt_type;
2400 /* The type of a pointer to an element in the array. */
2405 tree try_block = NULL_TREE;
2406 int num_initialized_elts = 0;
2409 if (TYPE_DOMAIN (atype))
2410 maxindex = array_type_nelts (atype);
2412 if (maxindex == NULL_TREE || maxindex == error_mark_node)
2413 return error_mark_node;
2415 if (explicit_default_init_p)
2418 inner_elt_type = strip_array_types (atype);
2421 ? (!CLASS_TYPE_P (inner_elt_type)
2422 || !TYPE_HAS_COMPLEX_ASSIGN_REF (inner_elt_type))
2423 : !TYPE_NEEDS_CONSTRUCTING (type))
2424 && ((TREE_CODE (init) == CONSTRUCTOR
2425 /* Don't do this if the CONSTRUCTOR might contain something
2426 that might throw and require us to clean up. */
2427 && (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init))
2428 || ! TYPE_HAS_NONTRIVIAL_DESTRUCTOR (inner_elt_type)))
2431 /* Do non-default initialization of POD arrays resulting from
2432 brace-enclosed initializers. In this case, digest_init and
2433 store_constructor will handle the semantics for us. */
2435 stmt_expr = build2 (INIT_EXPR, atype, base, init);
2439 maxindex = cp_convert (ptrdiff_type_node, maxindex);
2440 ptype = build_pointer_type (type);
2441 size = size_in_bytes (type);
2442 if (TREE_CODE (TREE_TYPE (base)) == ARRAY_TYPE)
2443 base = cp_convert (ptype, decay_conversion (base));
2445 /* The code we are generating looks like:
2449 ptrdiff_t iterator = maxindex;
2451 for (; iterator != -1; --iterator) {
2452 ... initialize *t1 ...
2456 ... destroy elements that were constructed ...
2461 We can omit the try and catch blocks if we know that the
2462 initialization will never throw an exception, or if the array
2463 elements do not have destructors. We can omit the loop completely if
2464 the elements of the array do not have constructors.
2466 We actually wrap the entire body of the above in a STMT_EXPR, for
2469 When copying from array to another, when the array elements have
2470 only trivial copy constructors, we should use __builtin_memcpy
2471 rather than generating a loop. That way, we could take advantage
2472 of whatever cleverness the back-end has for dealing with copies
2473 of blocks of memory. */
2475 is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
2476 destroy_temps = stmts_are_full_exprs_p ();
2477 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2478 rval = get_temp_regvar (ptype, base);
2479 base = get_temp_regvar (ptype, rval);
2480 iterator = get_temp_regvar (ptrdiff_type_node, maxindex);
2482 /* Protect the entire array initialization so that we can destroy
2483 the partially constructed array if an exception is thrown.
2484 But don't do this if we're assigning. */
2485 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2488 try_block = begin_try_block ();
2491 if (init != NULL_TREE && TREE_CODE (init) == CONSTRUCTOR)
2493 /* Do non-default initialization of non-POD arrays resulting from
2494 brace-enclosed initializers. */
2495 unsigned HOST_WIDE_INT idx;
2499 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init), idx, elt)
2501 tree baseref = build1 (INDIRECT_REF, type, base);
2503 num_initialized_elts++;
2505 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2506 if (IS_AGGR_TYPE (type) || TREE_CODE (type) == ARRAY_TYPE)
2507 finish_expr_stmt (build_aggr_init (baseref, elt, 0));
2509 finish_expr_stmt (build_modify_expr (baseref, NOP_EXPR,
2511 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2513 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base, 0));
2514 finish_expr_stmt (build_unary_op (PREDECREMENT_EXPR, iterator, 0));
2517 /* Clear out INIT so that we don't get confused below. */
2520 else if (from_array)
2522 /* If initializing one array from another, initialize element by
2523 element. We rely upon the below calls the do argument
2527 base2 = decay_conversion (init);
2528 itype = TREE_TYPE (base2);
2529 base2 = get_temp_regvar (itype, base2);
2530 itype = TREE_TYPE (itype);
2532 else if (TYPE_LANG_SPECIFIC (type)
2533 && TYPE_NEEDS_CONSTRUCTING (type)
2534 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
2536 error ("initializer ends prematurely");
2537 return error_mark_node;
2541 /* Now, default-initialize any remaining elements. We don't need to
2542 do that if a) the type does not need constructing, or b) we've
2543 already initialized all the elements.
2545 We do need to keep going if we're copying an array. */
2548 || ((TYPE_NEEDS_CONSTRUCTING (type) || explicit_default_init_p)
2549 && ! (host_integerp (maxindex, 0)
2550 && (num_initialized_elts
2551 == tree_low_cst (maxindex, 0) + 1))))
2553 /* If the ITERATOR is equal to -1, then we don't have to loop;
2554 we've already initialized all the elements. */
2559 for_stmt = begin_for_stmt ();
2560 finish_for_init_stmt (for_stmt);
2561 finish_for_cond (build2 (NE_EXPR, boolean_type_node, iterator,
2562 build_int_cst (TREE_TYPE (iterator), -1)),
2564 finish_for_expr (build_unary_op (PREDECREMENT_EXPR, iterator, 0),
2567 to = build1 (INDIRECT_REF, type, base);
2574 from = build1 (INDIRECT_REF, itype, base2);
2578 if (from_array == 2)
2579 elt_init = build_modify_expr (to, NOP_EXPR, from);
2580 else if (TYPE_NEEDS_CONSTRUCTING (type))
2581 elt_init = build_aggr_init (to, from, 0);
2583 elt_init = build_modify_expr (to, NOP_EXPR, from);
2587 else if (TREE_CODE (type) == ARRAY_TYPE)
2591 ("cannot initialize multi-dimensional array with initializer");
2592 elt_init = build_vec_init (build1 (INDIRECT_REF, type, base),
2594 /*explicit_default_init_p=*/false,
2597 else if (!TYPE_NEEDS_CONSTRUCTING (type))
2598 elt_init = (build_modify_expr
2600 build_zero_init (type, size_one_node,
2601 /*static_storage_p=*/false)));
2603 elt_init = build_aggr_init (to, init, 0);
2605 current_stmt_tree ()->stmts_are_full_exprs_p = 1;
2606 finish_expr_stmt (elt_init);
2607 current_stmt_tree ()->stmts_are_full_exprs_p = 0;
2609 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base, 0));
2611 finish_expr_stmt (build_unary_op (PREINCREMENT_EXPR, base2, 0));
2613 finish_for_stmt (for_stmt);
2616 /* Make sure to cleanup any partially constructed elements. */
2617 if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
2621 tree m = cp_build_binary_op (MINUS_EXPR, maxindex, iterator);
2623 /* Flatten multi-dimensional array since build_vec_delete only
2624 expects one-dimensional array. */
2625 if (TREE_CODE (type) == ARRAY_TYPE)
2626 m = cp_build_binary_op (MULT_EXPR, m,
2627 array_type_nelts_total (type));
2629 finish_cleanup_try_block (try_block);
2630 e = build_vec_delete_1 (rval, m,
2631 inner_elt_type, sfk_base_destructor,
2632 /*use_global_delete=*/0);
2633 finish_cleanup (e, try_block);
2636 /* The value of the array initialization is the array itself, RVAL
2637 is a pointer to the first element. */
2638 finish_stmt_expr_expr (rval, stmt_expr);
2640 stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt);
2642 /* Now convert make the result have the correct type. */
2643 atype = build_pointer_type (atype);
2644 stmt_expr = build1 (NOP_EXPR, atype, stmt_expr);
2645 stmt_expr = build_indirect_ref (stmt_expr, NULL);
2647 current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps;
2651 /* Call the DTOR_KIND destructor for EXP. FLAGS are as for
2655 build_dtor_call (tree exp, special_function_kind dtor_kind, int flags)
2661 case sfk_complete_destructor:
2662 name = complete_dtor_identifier;
2665 case sfk_base_destructor:
2666 name = base_dtor_identifier;
2669 case sfk_deleting_destructor:
2670 name = deleting_dtor_identifier;
2676 fn = lookup_fnfields (TREE_TYPE (exp), name, /*protect=*/2);
2677 return build_new_method_call (exp, fn,
2679 /*conversion_path=*/NULL_TREE,
2684 /* Generate a call to a destructor. TYPE is the type to cast ADDR to.
2685 ADDR is an expression which yields the store to be destroyed.
2686 AUTO_DELETE is the name of the destructor to call, i.e., either
2687 sfk_complete_destructor, sfk_base_destructor, or
2688 sfk_deleting_destructor.
2690 FLAGS is the logical disjunction of zero or more LOOKUP_
2691 flags. See cp-tree.h for more info. */
2694 build_delete (tree type, tree addr, special_function_kind auto_delete,
2695 int flags, int use_global_delete)
2699 if (addr == error_mark_node)
2700 return error_mark_node;
2702 /* Can happen when CURRENT_EXCEPTION_OBJECT gets its type
2703 set to `error_mark_node' before it gets properly cleaned up. */
2704 if (type == error_mark_node)
2705 return error_mark_node;
2707 type = TYPE_MAIN_VARIANT (type);
2709 if (TREE_CODE (type) == POINTER_TYPE)
2711 bool complete_p = true;
2713 type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
2714 if (TREE_CODE (type) == ARRAY_TYPE)
2717 /* We don't want to warn about delete of void*, only other
2718 incomplete types. Deleting other incomplete types
2719 invokes undefined behavior, but it is not ill-formed, so
2720 compile to something that would even do The Right Thing
2721 (TM) should the type have a trivial dtor and no delete
2723 if (!VOID_TYPE_P (type))
2725 complete_type (type);
2726 if (!COMPLETE_TYPE_P (type))
2728 warning (0, "possible problem detected in invocation of "
2729 "delete operator:");
2730 cxx_incomplete_type_diagnostic (addr, type, 1);
2731 inform ("neither the destructor nor the class-specific "
2732 "operator delete will be called, even if they are "
2733 "declared when the class is defined.");
2737 if (VOID_TYPE_P (type) || !complete_p || !IS_AGGR_TYPE (type))
2738 /* Call the builtin operator delete. */
2739 return build_builtin_delete_call (addr);
2740 if (TREE_SIDE_EFFECTS (addr))
2741 addr = save_expr (addr);
2743 /* Throw away const and volatile on target type of addr. */
2744 addr = convert_force (build_pointer_type (type), addr, 0);
2746 else if (TREE_CODE (type) == ARRAY_TYPE)
2750 if (TYPE_DOMAIN (type) == NULL_TREE)
2752 error ("unknown array size in delete");
2753 return error_mark_node;
2755 return build_vec_delete (addr, array_type_nelts (type),
2756 auto_delete, use_global_delete);
2760 /* Don't check PROTECT here; leave that decision to the
2761 destructor. If the destructor is accessible, call it,
2762 else report error. */
2763 addr = build_unary_op (ADDR_EXPR, addr, 0);
2764 if (TREE_SIDE_EFFECTS (addr))
2765 addr = save_expr (addr);
2767 addr = convert_force (build_pointer_type (type), addr, 0);
2770 gcc_assert (IS_AGGR_TYPE (type));
2772 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type))
2774 if (auto_delete != sfk_deleting_destructor)
2775 return void_zero_node;
2777 return build_op_delete_call (DELETE_EXPR, addr,
2778 cxx_sizeof_nowarn (type),
2780 /*placement=*/NULL_TREE,
2781 /*alloc_fn=*/NULL_TREE);
2785 tree do_delete = NULL_TREE;
2788 if (CLASSTYPE_LAZY_DESTRUCTOR (type))
2789 lazily_declare_fn (sfk_destructor, type);
2791 /* For `::delete x', we must not use the deleting destructor
2792 since then we would not be sure to get the global `operator
2794 if (use_global_delete && auto_delete == sfk_deleting_destructor)
2796 /* We will use ADDR multiple times so we must save it. */
2797 addr = save_expr (addr);
2798 /* Delete the object. */
2799 do_delete = build_builtin_delete_call (addr);
2800 /* Otherwise, treat this like a complete object destructor
2802 auto_delete = sfk_complete_destructor;
2804 /* If the destructor is non-virtual, there is no deleting
2805 variant. Instead, we must explicitly call the appropriate
2806 `operator delete' here. */
2807 else if (!DECL_VIRTUAL_P (CLASSTYPE_DESTRUCTORS (type))
2808 && auto_delete == sfk_deleting_destructor)
2810 /* We will use ADDR multiple times so we must save it. */
2811 addr = save_expr (addr);
2812 /* Build the call. */
2813 do_delete = build_op_delete_call (DELETE_EXPR,
2815 cxx_sizeof_nowarn (type),
2817 /*placement=*/NULL_TREE,
2818 /*alloc_fn=*/NULL_TREE);
2819 /* Call the complete object destructor. */
2820 auto_delete = sfk_complete_destructor;
2822 else if (auto_delete == sfk_deleting_destructor
2823 && TYPE_GETS_REG_DELETE (type))
2825 /* Make sure we have access to the member op delete, even though
2826 we'll actually be calling it from the destructor. */
2827 build_op_delete_call (DELETE_EXPR, addr, cxx_sizeof_nowarn (type),
2829 /*placement=*/NULL_TREE,
2830 /*alloc_fn=*/NULL_TREE);
2833 expr = build_dtor_call (build_indirect_ref (addr, NULL),
2834 auto_delete, flags);
2836 expr = build2 (COMPOUND_EXPR, void_type_node, expr, do_delete);
2838 if (flags & LOOKUP_DESTRUCTOR)
2839 /* Explicit destructor call; don't check for null pointer. */
2840 ifexp = integer_one_node;
2842 /* Handle deleting a null pointer. */
2843 ifexp = fold (cp_build_binary_op (NE_EXPR, addr, integer_zero_node));
2845 if (ifexp != integer_one_node)
2846 expr = build3 (COND_EXPR, void_type_node,
2847 ifexp, expr, void_zero_node);
2853 /* At the beginning of a destructor, push cleanups that will call the
2854 destructors for our base classes and members.
2856 Called from begin_destructor_body. */
2859 push_base_cleanups (void)
2861 tree binfo, base_binfo;
2865 VEC(tree,gc) *vbases;
2867 /* Run destructors for all virtual baseclasses. */
2868 if (CLASSTYPE_VBASECLASSES (current_class_type))
2870 tree cond = (condition_conversion
2871 (build2 (BIT_AND_EXPR, integer_type_node,
2872 current_in_charge_parm,
2873 integer_two_node)));
2875 /* The CLASSTYPE_VBASECLASSES vector is in initialization
2876 order, which is also the right order for pushing cleanups. */
2877 for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;
2878 VEC_iterate (tree, vbases, i, base_binfo); i++)
2880 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo)))
2882 expr = build_special_member_call (current_class_ref,
2883 base_dtor_identifier,
2887 | LOOKUP_NONVIRTUAL));
2888 expr = build3 (COND_EXPR, void_type_node, cond,
2889 expr, void_zero_node);
2890 finish_decl_cleanup (NULL_TREE, expr);
2895 /* Take care of the remaining baseclasses. */
2896 for (binfo = TYPE_BINFO (current_class_type), i = 0;
2897 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
2899 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo))
2900 || BINFO_VIRTUAL_P (base_binfo))
2903 expr = build_special_member_call (current_class_ref,
2904 base_dtor_identifier,
2905 NULL_TREE, base_binfo,
2906 LOOKUP_NORMAL | LOOKUP_NONVIRTUAL);
2907 finish_decl_cleanup (NULL_TREE, expr);
2910 for (member = TYPE_FIELDS (current_class_type); member;
2911 member = TREE_CHAIN (member))
2913 if (TREE_CODE (member) != FIELD_DECL || DECL_ARTIFICIAL (member))
2915 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (member)))
2917 tree this_member = (build_class_member_access_expr
2918 (current_class_ref, member,
2919 /*access_path=*/NULL_TREE,
2920 /*preserve_reference=*/false));
2921 tree this_type = TREE_TYPE (member);
2922 expr = build_delete (this_type, this_member,
2923 sfk_complete_destructor,
2924 LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR|LOOKUP_NORMAL,
2926 finish_decl_cleanup (NULL_TREE, expr);
2931 /* Build a C++ vector delete expression.
2932 MAXINDEX is the number of elements to be deleted.
2933 ELT_SIZE is the nominal size of each element in the vector.
2934 BASE is the expression that should yield the store to be deleted.
2935 This function expands (or synthesizes) these calls itself.
2936 AUTO_DELETE_VEC says whether the container (vector) should be deallocated.
2938 This also calls delete for virtual baseclasses of elements of the vector.
2940 Update: MAXINDEX is no longer needed. The size can be extracted from the
2941 start of the vector for pointers, and from the type for arrays. We still
2942 use MAXINDEX for arrays because it happens to already have one of the
2943 values we'd have to extract. (We could use MAXINDEX with pointers to
2944 confirm the size, and trap if the numbers differ; not clear that it'd
2945 be worth bothering.) */
2948 build_vec_delete (tree base, tree maxindex,
2949 special_function_kind auto_delete_vec, int use_global_delete)
2953 tree base_init = NULL_TREE;
2955 type = TREE_TYPE (base);
2957 if (TREE_CODE (type) == POINTER_TYPE)
2959 /* Step back one from start of vector, and read dimension. */
2962 if (TREE_SIDE_EFFECTS (base))
2964 base_init = get_target_expr (base);
2965 base = TARGET_EXPR_SLOT (base_init);
2967 type = strip_array_types (TREE_TYPE (type));
2968 cookie_addr = build2 (MINUS_EXPR,
2969 build_pointer_type (sizetype),
2971 TYPE_SIZE_UNIT (sizetype));
2972 maxindex = build_indirect_ref (cookie_addr, NULL);
2974 else if (TREE_CODE (type) == ARRAY_TYPE)
2976 /* Get the total number of things in the array, maxindex is a
2978 maxindex = array_type_nelts_total (type);
2979 type = strip_array_types (type);
2980 base = build_unary_op (ADDR_EXPR, base, 1);
2981 if (TREE_SIDE_EFFECTS (base))
2983 base_init = get_target_expr (base);
2984 base = TARGET_EXPR_SLOT (base_init);
2989 if (base != error_mark_node)
2990 error ("type to vector delete is neither pointer or array type");
2991 return error_mark_node;
2994 rval = build_vec_delete_1 (base, maxindex, type, auto_delete_vec,
2997 rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), base_init, rval);