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/* Handle initialization things in C++. Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. Contributed by Michael Tiemann (tiemann@cygnus.com) This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ /* High-level class interface. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "rtl.h" #include "expr.h" #include "cp-tree.h" #include "flags.h" #include "output.h" #include "except.h" #include "toplev.h" #include "target.h" static bool begin_init_stmts (tree *, tree *); static tree finish_init_stmts (bool, tree, tree); static void construct_virtual_base (tree, tree); static void expand_aggr_init_1 (tree, tree, tree, tree, int, tsubst_flags_t); static void expand_default_init (tree, tree, tree, tree, int, tsubst_flags_t); static tree build_vec_delete_1 (tree, tree, tree, special_function_kind, int); static void perform_member_init (tree, tree); static tree build_builtin_delete_call (tree); static int member_init_ok_or_else (tree, tree, tree); static void expand_virtual_init (tree, tree); static tree sort_mem_initializers (tree, tree); static tree initializing_context (tree); static void expand_cleanup_for_base (tree, tree); static tree get_temp_regvar (tree, tree); static tree dfs_initialize_vtbl_ptrs (tree, void *); static tree build_dtor_call (tree, special_function_kind, int); static tree build_field_list (tree, tree, int *); static tree build_vtbl_address (tree); /* We are about to generate some complex initialization code. Conceptually, it is all a single expression. However, we may want to include conditionals, loops, and other such statement-level constructs. Therefore, we build the initialization code inside a statement-expression. This function starts such an expression. STMT_EXPR_P and COMPOUND_STMT_P are filled in by this function; pass them back to finish_init_stmts when the expression is complete. */ static bool begin_init_stmts (tree *stmt_expr_p, tree *compound_stmt_p) { bool is_global = !building_stmt_tree (); *stmt_expr_p = begin_stmt_expr (); *compound_stmt_p = begin_compound_stmt (BCS_NO_SCOPE); return is_global; } /* Finish out the statement-expression begun by the previous call to begin_init_stmts. Returns the statement-expression itself. */ static tree finish_init_stmts (bool is_global, tree stmt_expr, tree compound_stmt) { finish_compound_stmt (compound_stmt); stmt_expr = finish_stmt_expr (stmt_expr, true); gcc_assert (!building_stmt_tree () == is_global); return stmt_expr; } /* Constructors */ /* Called from initialize_vtbl_ptrs via dfs_walk. BINFO is the base which we want to initialize the vtable pointer for, DATA is TREE_LIST whose TREE_VALUE is the this ptr expression. */ static tree dfs_initialize_vtbl_ptrs (tree binfo, void *data) { if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) return dfs_skip_bases; if (!BINFO_PRIMARY_P (binfo) || BINFO_VIRTUAL_P (binfo)) { tree base_ptr = TREE_VALUE ((tree) data); base_ptr = build_base_path (PLUS_EXPR, base_ptr, binfo, /*nonnull=*/1); expand_virtual_init (binfo, base_ptr); } return NULL_TREE; } /* Initialize all the vtable pointers in the object pointed to by ADDR. */ void initialize_vtbl_ptrs (tree addr) { tree list; tree type; type = TREE_TYPE (TREE_TYPE (addr)); list = build_tree_list (type, addr); /* Walk through the hierarchy, initializing the vptr in each base class. We do these in pre-order because we can't find the virtual bases for a class until we've initialized the vtbl for that class. */ dfs_walk_once (TYPE_BINFO (type), dfs_initialize_vtbl_ptrs, NULL, list); } /* Return an expression for the zero-initialization of an object with type T. This expression will either be a constant (in the case that T is a scalar), or a CONSTRUCTOR (in the case that T is an aggregate), or NULL (in the case that T does not require initialization). In either case, the value can be used as DECL_INITIAL for a decl of the indicated TYPE; it is a valid static initializer. If NELTS is non-NULL, and TYPE is an ARRAY_TYPE, NELTS is the number of elements in the array. If STATIC_STORAGE_P is TRUE, initializers are only generated for entities for which zero-initialization does not simply mean filling the storage with zero bytes. */ tree build_zero_init (tree type, tree nelts, bool static_storage_p) { tree init = NULL_TREE; /* [dcl.init] To zero-initialize an object of type T means: -- if T is a scalar type, the storage is set to the value of zero converted to T. -- if T is a non-union class type, the storage for each nonstatic data member and each base-class subobject is zero-initialized. -- if T is a union type, the storage for its first data member is zero-initialized. -- if T is an array type, the storage for each element is zero-initialized. -- if T is a reference type, no initialization is performed. */ gcc_assert (nelts == NULL_TREE || TREE_CODE (nelts) == INTEGER_CST); if (type == error_mark_node) ; else if (static_storage_p && zero_init_p (type)) /* In order to save space, we do not explicitly build initializers for items that do not need them. GCC's semantics are that items with static storage duration that are not otherwise initialized are initialized to zero. */ ; else if (SCALAR_TYPE_P (type)) init = convert (type, integer_zero_node); else if (CLASS_TYPE_P (type)) { tree field; VEC(constructor_elt,gc) *v = NULL; /* Iterate over the fields, building initializations. */ for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) { if (TREE_CODE (field) != FIELD_DECL) continue; /* Note that for class types there will be FIELD_DECLs corresponding to base classes as well. Thus, iterating over TYPE_FIELDs will result in correct initialization of all of the subobjects. */ if (!static_storage_p || !zero_init_p (TREE_TYPE (field))) { tree value = build_zero_init (TREE_TYPE (field), /*nelts=*/NULL_TREE, static_storage_p); if (value) CONSTRUCTOR_APPEND_ELT(v, field, value); } /* For unions, only the first field is initialized. */ if (TREE_CODE (type) == UNION_TYPE) break; } /* Build a constructor to contain the initializations. */ init = build_constructor (type, v); } else if (TREE_CODE (type) == ARRAY_TYPE) { tree max_index; VEC(constructor_elt,gc) *v = NULL; /* Iterate over the array elements, building initializations. */ if (nelts) max_index = fold_build2_loc (input_location, MINUS_EXPR, TREE_TYPE (nelts), nelts, integer_one_node); else max_index = array_type_nelts (type); /* If we have an error_mark here, we should just return error mark as we don't know the size of the array yet. */ if (max_index == error_mark_node) return error_mark_node; gcc_assert (TREE_CODE (max_index) == INTEGER_CST); /* A zero-sized array, which is accepted as an extension, will have an upper bound of -1. */ if (!tree_int_cst_equal (max_index, integer_minus_one_node)) { constructor_elt *ce; v = VEC_alloc (constructor_elt, gc, 1); ce = VEC_quick_push (constructor_elt, v, NULL); /* If this is a one element array, we just use a regular init. */ if (tree_int_cst_equal (size_zero_node, max_index)) ce->index = size_zero_node; else ce->index = build2 (RANGE_EXPR, sizetype, size_zero_node, max_index); ce->value = build_zero_init (TREE_TYPE (type), /*nelts=*/NULL_TREE, static_storage_p); } /* Build a constructor to contain the initializations. */ init = build_constructor (type, v); } else if (TREE_CODE (type) == VECTOR_TYPE) init = fold_convert (type, integer_zero_node); else gcc_assert (TREE_CODE (type) == REFERENCE_TYPE); /* In all cases, the initializer is a constant. */ if (init) TREE_CONSTANT (init) = 1; return init; } /* Return a suitable initializer for value-initializing an object of type TYPE, as described in [dcl.init]. */ tree build_value_init (tree type) { /* [dcl.init] To value-initialize an object of type T means: - if T is a class type (clause 9) with a user-provided constructor (12.1), then the default constructor for T is called (and the initialization is ill-formed if T has no accessible default constructor); - if T is a non-union class type without a user-provided constructor, then every non-static data member and base-class component of T is value-initialized;92) - if T is an array type, then each element is value-initialized; - otherwise, the object is zero-initialized. A program that calls for default-initialization or value-initialization of an entity of reference type is ill-formed. 92) Value-initialization for such a class object may be implemented by zero-initializing the object and then calling the default constructor. */ if (CLASS_TYPE_P (type)) { if (type_has_user_provided_constructor (type)) return build_aggr_init_expr (type, build_special_member_call (NULL_TREE, complete_ctor_identifier, NULL, type, LOOKUP_NORMAL, tf_warning_or_error)); else if (TREE_CODE (type) != UNION_TYPE && TYPE_NEEDS_CONSTRUCTING (type)) { /* This is a class that needs constructing, but doesn't have a user-provided constructor. So we need to zero-initialize the object and then call the implicitly defined ctor. This will be handled in simplify_aggr_init_expr. */ tree ctor = build_special_member_call (NULL_TREE, complete_ctor_identifier, NULL, type, LOOKUP_NORMAL, tf_warning_or_error); ctor = build_aggr_init_expr (type, ctor); AGGR_INIT_ZERO_FIRST (ctor) = 1; return ctor; } } return build_value_init_noctor (type); } /* Like build_value_init, but don't call the constructor for TYPE. Used for base initializers. */ tree build_value_init_noctor (tree type) { if (CLASS_TYPE_P (type)) { gcc_assert (!TYPE_NEEDS_CONSTRUCTING (type)); if (TREE_CODE (type) != UNION_TYPE) { tree field; VEC(constructor_elt,gc) *v = NULL; /* Iterate over the fields, building initializations. */ for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) { tree ftype, value; if (TREE_CODE (field) != FIELD_DECL) continue; ftype = TREE_TYPE (field); if (TREE_CODE (ftype) == REFERENCE_TYPE) error ("value-initialization of reference"); /* We could skip vfields and fields of types with user-defined constructors, but I think that won't improve performance at all; it should be simpler in general just to zero out the entire object than try to only zero the bits that actually need it. */ /* Note that for class types there will be FIELD_DECLs corresponding to base classes as well. Thus, iterating over TYPE_FIELDs will result in correct initialization of all of the subobjects. */ value = build_value_init (ftype); if (value) CONSTRUCTOR_APPEND_ELT(v, field, value); } /* Build a constructor to contain the zero- initializations. */ return build_constructor (type, v); } } else if (TREE_CODE (type) == ARRAY_TYPE) { VEC(constructor_elt,gc) *v = NULL; /* Iterate over the array elements, building initializations. */ tree max_index = array_type_nelts (type); /* If we have an error_mark here, we should just return error mark as we don't know the size of the array yet. */ if (max_index == error_mark_node) return error_mark_node; gcc_assert (TREE_CODE (max_index) == INTEGER_CST); /* A zero-sized array, which is accepted as an extension, will have an upper bound of -1. */ if (!tree_int_cst_equal (max_index, integer_minus_one_node)) { constructor_elt *ce; v = VEC_alloc (constructor_elt, gc, 1); ce = VEC_quick_push (constructor_elt, v, NULL); /* If this is a one element array, we just use a regular init. */ if (tree_int_cst_equal (size_zero_node, max_index)) ce->index = size_zero_node; else ce->index = build2 (RANGE_EXPR, sizetype, size_zero_node, max_index); ce->value = build_value_init (TREE_TYPE (type)); /* The gimplifier can't deal with a RANGE_EXPR of TARGET_EXPRs. */ gcc_assert (TREE_CODE (ce->value) != TARGET_EXPR && TREE_CODE (ce->value) != AGGR_INIT_EXPR); } /* Build a constructor to contain the initializations. */ return build_constructor (type, v); } return build_zero_init (type, NULL_TREE, /*static_storage_p=*/false); } /* Initialize MEMBER, a FIELD_DECL, with INIT, a TREE_LIST of arguments. If TREE_LIST is void_type_node, an empty initializer list was given; if NULL_TREE no initializer was given. */ static void perform_member_init (tree member, tree init) { tree decl; tree type = TREE_TYPE (member); /* Effective C++ rule 12 requires that all data members be initialized. */ if (warn_ecpp && init == NULL_TREE && TREE_CODE (type) != ARRAY_TYPE) warning_at (DECL_SOURCE_LOCATION (current_function_decl), OPT_Weffc__, "%qD should be initialized in the member initialization list", member); /* Get an lvalue for the data member. */ decl = build_class_member_access_expr (current_class_ref, member, /*access_path=*/NULL_TREE, /*preserve_reference=*/true, tf_warning_or_error); if (decl == error_mark_node) return; if (init == void_type_node) { /* mem() means value-initialization. */ if (TREE_CODE (type) == ARRAY_TYPE) { init = build_vec_init (decl, NULL_TREE, NULL_TREE, /*explicit_value_init_p=*/true, /* from_array=*/0, tf_warning_or_error); finish_expr_stmt (init); } else { if (TREE_CODE (type) == REFERENCE_TYPE) permerror (DECL_SOURCE_LOCATION (current_function_decl), "value-initialization of %q#D, which has reference type", member); else { init = build2 (INIT_EXPR, type, decl, build_value_init (type)); finish_expr_stmt (init); } } } /* Deal with this here, as we will get confused if we try to call the assignment op for an anonymous union. This can happen in a synthesized copy constructor. */ else if (ANON_AGGR_TYPE_P (type)) { if (init) { init = build2 (INIT_EXPR, type, decl, TREE_VALUE (init)); finish_expr_stmt (init); } } else if (TYPE_NEEDS_CONSTRUCTING (type)) { if (init != NULL_TREE && TREE_CODE (type) == ARRAY_TYPE && TREE_CHAIN (init) == NULL_TREE && TREE_CODE (TREE_TYPE (TREE_VALUE (init))) == ARRAY_TYPE) { /* Initialization of one array from another. */ finish_expr_stmt (build_vec_init (decl, NULL_TREE, TREE_VALUE (init), /*explicit_value_init_p=*/false, /* from_array=*/1, tf_warning_or_error)); } else { if (CP_TYPE_CONST_P (type) && init == NULL_TREE && !type_has_user_provided_default_constructor (type)) /* TYPE_NEEDS_CONSTRUCTING can be set just because we have a vtable; still give this diagnostic. */ permerror (DECL_SOURCE_LOCATION (current_function_decl), "uninitialized member %qD with %<const%> type %qT", member, type); finish_expr_stmt (build_aggr_init (decl, init, 0, tf_warning_or_error)); } } else { if (init == NULL_TREE) { /* member traversal: note it leaves init NULL */ if (TREE_CODE (type) == REFERENCE_TYPE) permerror (DECL_SOURCE_LOCATION (current_function_decl), "uninitialized reference member %qD", member); else if (CP_TYPE_CONST_P (type)) permerror (DECL_SOURCE_LOCATION (current_function_decl), "uninitialized member %qD with %<const%> type %qT", member, type); } else if (TREE_CODE (init) == TREE_LIST) /* There was an explicit member initialization. Do some work in that case. */ init = build_x_compound_expr_from_list (init, "member initializer"); if (init) finish_expr_stmt (cp_build_modify_expr (decl, INIT_EXPR, init, tf_warning_or_error)); } if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) { tree expr; expr = build_class_member_access_expr (current_class_ref, member, /*access_path=*/NULL_TREE, /*preserve_reference=*/false, tf_warning_or_error); expr = build_delete (type, expr, sfk_complete_destructor, LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0); if (expr != error_mark_node) finish_eh_cleanup (expr); } } /* Returns a TREE_LIST containing (as the TREE_PURPOSE of each node) all the FIELD_DECLs on the TYPE_FIELDS list for T, in reverse order. */ static tree build_field_list (tree t, tree list, int *uses_unions_p) { tree fields; *uses_unions_p = 0; /* Note whether or not T is a union. */ if (TREE_CODE (t) == UNION_TYPE) *uses_unions_p = 1; for (fields = TYPE_FIELDS (t); fields; fields = TREE_CHAIN (fields)) { /* Skip CONST_DECLs for enumeration constants and so forth. */ if (TREE_CODE (fields) != FIELD_DECL || DECL_ARTIFICIAL (fields)) continue; /* Keep track of whether or not any fields are unions. */ if (TREE_CODE (TREE_TYPE (fields)) == UNION_TYPE) *uses_unions_p = 1; /* For an anonymous struct or union, we must recursively consider the fields of the anonymous type. They can be directly initialized from the constructor. */ if (ANON_AGGR_TYPE_P (TREE_TYPE (fields))) { /* Add this field itself. Synthesized copy constructors initialize the entire aggregate. */ list = tree_cons (fields, NULL_TREE, list); /* And now add the fields in the anonymous aggregate. */ list = build_field_list (TREE_TYPE (fields), list, uses_unions_p); } /* Add this field. */ else if (DECL_NAME (fields)) list = tree_cons (fields, NULL_TREE, list); } return list; } /* The MEM_INITS are a TREE_LIST. The TREE_PURPOSE of each list gives a FIELD_DECL or BINFO in T that needs initialization. The TREE_VALUE gives the initializer, or list of initializer arguments. Return a TREE_LIST containing all of the initializations required for T, in the order in which they should be performed. The output list has the same format as the input. */ static tree sort_mem_initializers (tree t, tree mem_inits) { tree init; tree base, binfo, base_binfo; tree sorted_inits; tree next_subobject; VEC(tree,gc) *vbases; int i; int uses_unions_p; /* Build up a list of initializations. The TREE_PURPOSE of entry will be the subobject (a FIELD_DECL or BINFO) to initialize. The TREE_VALUE will be the constructor arguments, or NULL if no explicit initialization was provided. */ sorted_inits = NULL_TREE; /* Process the virtual bases. */ for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0; VEC_iterate (tree, vbases, i, base); i++) sorted_inits = tree_cons (base, NULL_TREE, sorted_inits); /* Process the direct bases. */ for (binfo = TYPE_BINFO (t), i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) if (!BINFO_VIRTUAL_P (base_binfo)) sorted_inits = tree_cons (base_binfo, NULL_TREE, sorted_inits); /* Process the non-static data members. */ sorted_inits = build_field_list (t, sorted_inits, &uses_unions_p); /* Reverse the entire list of initializations, so that they are in the order that they will actually be performed. */ sorted_inits = nreverse (sorted_inits); /* If the user presented the initializers in an order different from that in which they will actually occur, we issue a warning. Keep track of the next subobject which can be explicitly initialized without issuing a warning. */ next_subobject = sorted_inits; /* Go through the explicit initializers, filling in TREE_PURPOSE in the SORTED_INITS. */ for (init = mem_inits; init; init = TREE_CHAIN (init)) { tree subobject; tree subobject_init; subobject = TREE_PURPOSE (init); /* If the explicit initializers are in sorted order, then SUBOBJECT will be NEXT_SUBOBJECT, or something following it. */ for (subobject_init = next_subobject; subobject_init; subobject_init = TREE_CHAIN (subobject_init)) if (TREE_PURPOSE (subobject_init) == subobject) break; /* Issue a warning if the explicit initializer order does not match that which will actually occur. ??? Are all these on the correct lines? */ if (warn_reorder && !subobject_init) { if (TREE_CODE (TREE_PURPOSE (next_subobject)) == FIELD_DECL) warning (OPT_Wreorder, "%q+D will be initialized after", TREE_PURPOSE (next_subobject)); else warning (OPT_Wreorder, "base %qT will be initialized after", TREE_PURPOSE (next_subobject)); if (TREE_CODE (subobject) == FIELD_DECL) warning (OPT_Wreorder, " %q+#D", subobject); else warning (OPT_Wreorder, " base %qT", subobject); warning_at (DECL_SOURCE_LOCATION (current_function_decl), OPT_Wreorder, " when initialized here"); } /* Look again, from the beginning of the list. */ if (!subobject_init) { subobject_init = sorted_inits; while (TREE_PURPOSE (subobject_init) != subobject) subobject_init = TREE_CHAIN (subobject_init); } /* It is invalid to initialize the same subobject more than once. */ if (TREE_VALUE (subobject_init)) { if (TREE_CODE (subobject) == FIELD_DECL) error_at (DECL_SOURCE_LOCATION (current_function_decl), "multiple initializations given for %qD", subobject); else error_at (DECL_SOURCE_LOCATION (current_function_decl), "multiple initializations given for base %qT", subobject); } /* Record the initialization. */ TREE_VALUE (subobject_init) = TREE_VALUE (init); next_subobject = subobject_init; } /* [class.base.init] If a ctor-initializer specifies more than one mem-initializer for multiple members of the same union (including members of anonymous unions), the ctor-initializer is ill-formed. */ if (uses_unions_p) { tree last_field = NULL_TREE; for (init = sorted_inits; init; init = TREE_CHAIN (init)) { tree field; tree field_type; int done; /* Skip uninitialized members and base classes. */ if (!TREE_VALUE (init) || TREE_CODE (TREE_PURPOSE (init)) != FIELD_DECL) continue; /* See if this field is a member of a union, or a member of a structure contained in a union, etc. */ field = TREE_PURPOSE (init); for (field_type = DECL_CONTEXT (field); !same_type_p (field_type, t); field_type = TYPE_CONTEXT (field_type)) if (TREE_CODE (field_type) == UNION_TYPE) break; /* If this field is not a member of a union, skip it. */ if (TREE_CODE (field_type) != UNION_TYPE) continue; /* It's only an error if we have two initializers for the same union type. */ if (!last_field) { last_field = field; continue; } /* See if LAST_FIELD and the field initialized by INIT are members of the same union. If so, there's a problem, unless they're actually members of the same structure which is itself a member of a union. For example, given: union { struct { int i; int j; }; }; initializing both `i' and `j' makes sense. */ field_type = DECL_CONTEXT (field); done = 0; do { tree last_field_type; last_field_type = DECL_CONTEXT (last_field); while (1) { if (same_type_p (last_field_type, field_type)) { if (TREE_CODE (field_type) == UNION_TYPE) error_at (DECL_SOURCE_LOCATION (current_function_decl), "initializations for multiple members of %qT", last_field_type); done = 1; break; } if (same_type_p (last_field_type, t)) break; last_field_type = TYPE_CONTEXT (last_field_type); } /* If we've reached the outermost class, then we're done. */ if (same_type_p (field_type, t)) break; field_type = TYPE_CONTEXT (field_type); } while (!done); last_field = field; } } return sorted_inits; } /* Initialize all bases and members of CURRENT_CLASS_TYPE. MEM_INITS is a TREE_LIST giving the explicit mem-initializer-list for the constructor. The TREE_PURPOSE of each entry is a subobject (a FIELD_DECL or a BINFO) of the CURRENT_CLASS_TYPE. The TREE_VALUE is a TREE_LIST giving the arguments to the constructor or void_type_node for an empty list of arguments. */ void emit_mem_initializers (tree mem_inits) { /* We will already have issued an error message about the fact that the type is incomplete. */ if (!COMPLETE_TYPE_P (current_class_type)) return; /* Sort the mem-initializers into the order in which the initializations should be performed. */ mem_inits = sort_mem_initializers (current_class_type, mem_inits); in_base_initializer = 1; /* Initialize base classes. */ while (mem_inits && TREE_CODE (TREE_PURPOSE (mem_inits)) != FIELD_DECL) { tree subobject = TREE_PURPOSE (mem_inits); tree arguments = TREE_VALUE (mem_inits); /* If these initializations are taking place in a copy constructor, the base class should probably be explicitly initialized if there is a user-defined constructor in the base class (other than the default constructor, which will be called anyway). */ if (extra_warnings && !arguments && DECL_COPY_CONSTRUCTOR_P (current_function_decl) && type_has_user_nondefault_constructor (BINFO_TYPE (subobject))) warning_at (DECL_SOURCE_LOCATION (current_function_decl), OPT_Wextra, "base class %q#T should be explicitly initialized in the " "copy constructor", BINFO_TYPE (subobject)); /* Initialize the base. */ if (BINFO_VIRTUAL_P (subobject)) construct_virtual_base (subobject, arguments); else { tree base_addr; base_addr = build_base_path (PLUS_EXPR, current_class_ptr, subobject, 1); expand_aggr_init_1 (subobject, NULL_TREE, cp_build_indirect_ref (base_addr, RO_NULL, tf_warning_or_error), arguments, LOOKUP_NORMAL, tf_warning_or_error); expand_cleanup_for_base (subobject, NULL_TREE); } mem_inits = TREE_CHAIN (mem_inits); } in_base_initializer = 0; /* Initialize the vptrs. */ initialize_vtbl_ptrs (current_class_ptr); /* Initialize the data members. */ while (mem_inits) { perform_member_init (TREE_PURPOSE (mem_inits), TREE_VALUE (mem_inits)); mem_inits = TREE_CHAIN (mem_inits); } } /* Returns the address of the vtable (i.e., the value that should be assigned to the vptr) for BINFO. */ static tree build_vtbl_address (tree binfo) { tree binfo_for = binfo; tree vtbl; if (BINFO_VPTR_INDEX (binfo) && BINFO_VIRTUAL_P (binfo)) /* If this is a virtual primary base, then the vtable we want to store is that for the base this is being used as the primary base of. We can't simply skip the initialization, because we may be expanding the inits of a subobject constructor where the virtual base layout can be different. */ while (BINFO_PRIMARY_P (binfo_for)) binfo_for = BINFO_INHERITANCE_CHAIN (binfo_for); /* Figure out what vtable BINFO's vtable is based on, and mark it as used. */ vtbl = get_vtbl_decl_for_binfo (binfo_for); TREE_USED (vtbl) = 1; /* Now compute the address to use when initializing the vptr. */ vtbl = unshare_expr (BINFO_VTABLE (binfo_for)); if (TREE_CODE (vtbl) == VAR_DECL) vtbl = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (vtbl)), vtbl); return vtbl; } /* This code sets up the virtual function tables appropriate for the pointer DECL. It is a one-ply initialization. BINFO is the exact type that DECL is supposed to be. In multiple inheritance, this might mean "C's A" if C : A, B. */ static void expand_virtual_init (tree binfo, tree decl) { tree vtbl, vtbl_ptr; tree vtt_index; /* Compute the initializer for vptr. */ vtbl = build_vtbl_address (binfo); /* We may get this vptr from a VTT, if this is a subobject constructor or subobject destructor. */ vtt_index = BINFO_VPTR_INDEX (binfo); if (vtt_index) { tree vtbl2; tree vtt_parm; /* Compute the value to use, when there's a VTT. */ vtt_parm = current_vtt_parm; vtbl2 = build2 (POINTER_PLUS_EXPR, TREE_TYPE (vtt_parm), vtt_parm, vtt_index); vtbl2 = cp_build_indirect_ref (vtbl2, RO_NULL, tf_warning_or_error); vtbl2 = convert (TREE_TYPE (vtbl), vtbl2); /* The actual initializer is the VTT value only in the subobject constructor. In maybe_clone_body we'll substitute NULL for the vtt_parm in the case of the non-subobject constructor. */ vtbl = build3 (COND_EXPR, TREE_TYPE (vtbl), build2 (EQ_EXPR, boolean_type_node, current_in_charge_parm, integer_zero_node), vtbl2, vtbl); } /* Compute the location of the vtpr. */ vtbl_ptr = build_vfield_ref (cp_build_indirect_ref (decl, RO_NULL, tf_warning_or_error), TREE_TYPE (binfo)); gcc_assert (vtbl_ptr != error_mark_node); /* Assign the vtable to the vptr. */ vtbl = convert_force (TREE_TYPE (vtbl_ptr), vtbl, 0); finish_expr_stmt (cp_build_modify_expr (vtbl_ptr, NOP_EXPR, vtbl, tf_warning_or_error)); } /* If an exception is thrown in a constructor, those base classes already constructed must be destroyed. This function creates the cleanup for BINFO, which has just been constructed. If FLAG is non-NULL, it is a DECL which is nonzero when this base needs to be destroyed. */ static void expand_cleanup_for_base (tree binfo, tree flag) { tree expr; if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (binfo))) return; /* Call the destructor. */ expr = build_special_member_call (current_class_ref, base_dtor_identifier, NULL, binfo, LOOKUP_NORMAL | LOOKUP_NONVIRTUAL, tf_warning_or_error); if (flag) expr = fold_build3_loc (input_location, COND_EXPR, void_type_node, c_common_truthvalue_conversion (input_location, flag), expr, integer_zero_node); finish_eh_cleanup (expr); } /* Construct the virtual base-class VBASE passing the ARGUMENTS to its constructor. */ static void construct_virtual_base (tree vbase, tree arguments) { tree inner_if_stmt; tree exp; tree flag; /* If there are virtual base classes with destructors, we need to emit cleanups to destroy them if an exception is thrown during the construction process. These exception regions (i.e., the period during which the cleanups must occur) begin from the time the construction is complete to the end of the function. If we create a conditional block in which to initialize the base-classes, then the cleanup region for the virtual base begins inside a block, and ends outside of that block. This situation confuses the sjlj exception-handling code. Therefore, we do not create a single conditional block, but one for each initialization. (That way the cleanup regions always begin in the outer block.) We trust the back end to figure out that the FLAG will not change across initializations, and avoid doing multiple tests. */ flag = TREE_CHAIN (DECL_ARGUMENTS (current_function_decl)); inner_if_stmt = begin_if_stmt (); finish_if_stmt_cond (flag, inner_if_stmt); /* Compute the location of the virtual base. If we're constructing virtual bases, then we must be the most derived class. Therefore, we don't have to look up the virtual base; we already know where it is. */ exp = convert_to_base_statically (current_class_ref, vbase); expand_aggr_init_1 (vbase, current_class_ref, exp, arguments, LOOKUP_COMPLAIN, tf_warning_or_error); finish_then_clause (inner_if_stmt); finish_if_stmt (inner_if_stmt); expand_cleanup_for_base (vbase, flag); } /* Find the context in which this FIELD can be initialized. */ static tree initializing_context (tree field) { tree t = DECL_CONTEXT (field); /* Anonymous union members can be initialized in the first enclosing non-anonymous union context. */ while (t && ANON_AGGR_TYPE_P (t)) t = TYPE_CONTEXT (t); return t; } /* Function to give error message if member initialization specification is erroneous. FIELD is the member we decided to initialize. TYPE is the type for which the initialization is being performed. FIELD must be a member of TYPE. MEMBER_NAME is the name of the member. */ static int member_init_ok_or_else (tree field, tree type, tree member_name) { if (field == error_mark_node) return 0; if (!field) { error ("class %qT does not have any field named %qD", type, member_name); return 0; } if (TREE_CODE (field) == VAR_DECL) { error ("%q#D is a static data member; it can only be " "initialized at its definition", field); return 0; } if (TREE_CODE (field) != FIELD_DECL) { error ("%q#D is not a non-static data member of %qT", field, type); return 0; } if (initializing_context (field) != type) { error ("class %qT does not have any field named %qD", type, member_name); return 0; } return 1; } /* NAME is a FIELD_DECL, an IDENTIFIER_NODE which names a field, or it is a _TYPE node or TYPE_DECL which names a base for that type. Check the validity of NAME, and return either the base _TYPE, base binfo, or the FIELD_DECL of the member. If NAME is invalid, return NULL_TREE and issue a diagnostic. An old style unnamed direct single base construction is permitted, where NAME is NULL. */ tree expand_member_init (tree name) { tree basetype; tree field; if (!current_class_ref) return NULL_TREE; if (!name) { /* This is an obsolete unnamed base class initializer. The parser will already have warned about its use. */ switch (BINFO_N_BASE_BINFOS (TYPE_BINFO (current_class_type))) { case 0: error ("unnamed initializer for %qT, which has no base classes", current_class_type); return NULL_TREE; case 1: basetype = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (current_class_type), 0)); break; default: error ("unnamed initializer for %qT, which uses multiple inheritance", current_class_type); return NULL_TREE; } } else if (TYPE_P (name)) { basetype = TYPE_MAIN_VARIANT (name); name = TYPE_NAME (name); } else if (TREE_CODE (name) == TYPE_DECL) basetype = TYPE_MAIN_VARIANT (TREE_TYPE (name)); else basetype = NULL_TREE; if (basetype) { tree class_binfo; tree direct_binfo; tree virtual_binfo; int i; if (current_template_parms) return basetype; class_binfo = TYPE_BINFO (current_class_type); direct_binfo = NULL_TREE; virtual_binfo = NULL_TREE; /* Look for a direct base. */ for (i = 0; BINFO_BASE_ITERATE (class_binfo, i, direct_binfo); ++i) if (SAME_BINFO_TYPE_P (BINFO_TYPE (direct_binfo), basetype)) break; /* Look for a virtual base -- unless the direct base is itself virtual. */ if (!direct_binfo || !BINFO_VIRTUAL_P (direct_binfo)) virtual_binfo = binfo_for_vbase (basetype, current_class_type); /* [class.base.init] If a mem-initializer-id is ambiguous because it designates both a direct non-virtual base class and an inherited virtual base class, the mem-initializer is ill-formed. */ if (direct_binfo && virtual_binfo) { error ("%qD is both a direct base and an indirect virtual base", basetype); return NULL_TREE; } if (!direct_binfo && !virtual_binfo) { if (CLASSTYPE_VBASECLASSES (current_class_type)) error ("type %qT is not a direct or virtual base of %qT", basetype, current_class_type); else error ("type %qT is not a direct base of %qT", basetype, current_class_type); return NULL_TREE; } return direct_binfo ? direct_binfo : virtual_binfo; } else { if (TREE_CODE (name) == IDENTIFIER_NODE) field = lookup_field (current_class_type, name, 1, false); else field = name; if (member_init_ok_or_else (field, current_class_type, name)) return field; } return NULL_TREE; } /* This is like `expand_member_init', only it stores one aggregate value into another. INIT comes in two flavors: it is either a value which is to be stored in EXP, or it is a parameter list to go to a constructor, which will operate on EXP. If INIT is not a parameter list for a constructor, then set LOOKUP_ONLYCONVERTING. If FLAGS is LOOKUP_ONLYCONVERTING then it is the = init form of the initializer, if FLAGS is 0, then it is the (init) form. If `init' is a CONSTRUCTOR, then we emit a warning message, explaining that such initializations are invalid. If INIT resolves to a CALL_EXPR which happens to return something of the type we are looking for, then we know that we can safely use that call to perform the initialization. The virtual function table pointer cannot be set up here, because we do not really know its type. This never calls operator=(). When initializing, nothing is CONST. A default copy constructor may have to be used to perform the initialization. A constructor or a conversion operator may have to be used to perform the initialization, but not both, as it would be ambiguous. */ tree build_aggr_init (tree exp, tree init, int flags, tsubst_flags_t complain) { tree stmt_expr; tree compound_stmt; int destroy_temps; tree type = TREE_TYPE (exp); int was_const = TREE_READONLY (exp); int was_volatile = TREE_THIS_VOLATILE (exp); int is_global; if (init == error_mark_node) return error_mark_node; TREE_READONLY (exp) = 0; TREE_THIS_VOLATILE (exp) = 0; if (init && TREE_CODE (init) != TREE_LIST && !(BRACE_ENCLOSED_INITIALIZER_P (init) && CONSTRUCTOR_IS_DIRECT_INIT (init))) flags |= LOOKUP_ONLYCONVERTING; if (TREE_CODE (type) == ARRAY_TYPE) { tree itype; /* An array may not be initialized use the parenthesized initialization form -- unless the initializer is "()". */ if (init && TREE_CODE (init) == TREE_LIST) { if (complain & tf_error) error ("bad array initializer"); return error_mark_node; } /* Must arrange to initialize each element of EXP from elements of INIT. */ itype = init ? TREE_TYPE (init) : NULL_TREE; if (cv_qualified_p (type)) TREE_TYPE (exp) = cv_unqualified (type); if (itype && cv_qualified_p (itype)) TREE_TYPE (init) = cv_unqualified (itype); stmt_expr = build_vec_init (exp, NULL_TREE, init, /*explicit_value_init_p=*/false, itype && same_type_p (TREE_TYPE (init), TREE_TYPE (exp)), complain); TREE_READONLY (exp) = was_const; TREE_THIS_VOLATILE (exp) = was_volatile; TREE_TYPE (exp) = type; if (init) TREE_TYPE (init) = itype; return stmt_expr; } if (TREE_CODE (exp) == VAR_DECL || TREE_CODE (exp) == PARM_DECL) /* Just know that we've seen something for this node. */ TREE_USED (exp) = 1; is_global = begin_init_stmts (&stmt_expr, &compound_stmt); destroy_temps = stmts_are_full_exprs_p (); current_stmt_tree ()->stmts_are_full_exprs_p = 0; expand_aggr_init_1 (TYPE_BINFO (type), exp, exp, init, LOOKUP_NORMAL|flags, complain); stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt); current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps; TREE_READONLY (exp) = was_const; TREE_THIS_VOLATILE (exp) = was_volatile; return stmt_expr; } static void expand_default_init (tree binfo, tree true_exp, tree exp, tree init, int flags, tsubst_flags_t complain) { tree type = TREE_TYPE (exp); tree ctor_name; /* It fails because there may not be a constructor which takes its own type as the first (or only parameter), but which does take other types via a conversion. So, if the thing initializing the expression is a unit element of type X, first try X(X&), followed by initialization by X. If neither of these work out, then look hard. */ tree rval; VEC(tree,gc) *parms; if (init && TREE_CODE (init) != TREE_LIST && (flags & LOOKUP_ONLYCONVERTING)) { /* Base subobjects should only get direct-initialization. */ gcc_assert (true_exp == exp); if (flags & DIRECT_BIND) /* Do nothing. We hit this in two cases: Reference initialization, where we aren't initializing a real variable, so we don't want to run a new constructor; and catching an exception, where we have already built up the constructor call so we could wrap it in an exception region. */; else if (BRACE_ENCLOSED_INITIALIZER_P (init) && CP_AGGREGATE_TYPE_P (type)) { /* A brace-enclosed initializer for an aggregate. */ init = digest_init (type, init); } else init = ocp_convert (type, init, CONV_IMPLICIT|CONV_FORCE_TEMP, flags); if (TREE_CODE (init) == MUST_NOT_THROW_EXPR) /* We need to protect the initialization of a catch parm with a call to terminate(), which shows up as a MUST_NOT_THROW_EXPR around the TARGET_EXPR for the copy constructor. See initialize_handler_parm. */ { TREE_OPERAND (init, 0) = build2 (INIT_EXPR, TREE_TYPE (exp), exp, TREE_OPERAND (init, 0)); TREE_TYPE (init) = void_type_node; } else init = build2 (INIT_EXPR, TREE_TYPE (exp), exp, init); TREE_SIDE_EFFECTS (init) = 1; finish_expr_stmt (init); return; } if (init == NULL_TREE) parms = NULL; else if (TREE_CODE (init) == TREE_LIST && !TREE_TYPE (init)) { parms = make_tree_vector (); for (; init != NULL_TREE; init = TREE_CHAIN (init)) VEC_safe_push (tree, gc, parms, TREE_VALUE (init)); } else parms = make_tree_vector_single (init); if (true_exp == exp) ctor_name = complete_ctor_identifier; else ctor_name = base_ctor_identifier; rval = build_special_member_call (exp, ctor_name, &parms, binfo, flags, complain); if (parms != NULL) release_tree_vector (parms); if (TREE_SIDE_EFFECTS (rval)) finish_expr_stmt (convert_to_void (rval, NULL, complain)); } /* This function is responsible for initializing EXP with INIT (if any). BINFO is the binfo of the type for who we are performing the initialization. For example, if W is a virtual base class of A and B, and C : A, B. If we are initializing B, then W must contain B's W vtable, whereas were we initializing C, W must contain C's W vtable. TRUE_EXP is nonzero if it is the true expression being initialized. In this case, it may be EXP, or may just contain EXP. The reason we need this is because if EXP is a base element of TRUE_EXP, we don't necessarily know by looking at EXP where its virtual baseclass fields should really be pointing. But we do know from TRUE_EXP. In constructors, we don't know anything about the value being initialized. FLAGS is just passed to `build_new_method_call'. See that function for its description. */ static void expand_aggr_init_1 (tree binfo, tree true_exp, tree exp, tree init, int flags, tsubst_flags_t complain) { tree type = TREE_TYPE (exp); gcc_assert (init != error_mark_node && type != error_mark_node); gcc_assert (building_stmt_tree ()); /* Use a function returning the desired type to initialize EXP for us. If the function is a constructor, and its first argument is NULL_TREE, know that it was meant for us--just slide exp on in and expand the constructor. Constructors now come as TARGET_EXPRs. */ if (init && TREE_CODE (exp) == VAR_DECL && COMPOUND_LITERAL_P (init)) { /* If store_init_value returns NULL_TREE, the INIT has been recorded as the DECL_INITIAL for EXP. That means there's nothing more we have to do. */ init = store_init_value (exp, init, flags); if (init) finish_expr_stmt (init); return; } /* If an explicit -- but empty -- initializer list was present, that's value-initialization. */ if (init == void_type_node) { /* If there's a user-provided constructor, we just call that. */ if (type_has_user_provided_constructor (type)) /* Fall through. */; /* If there isn't, but we still need to call the constructor, zero out the object first. */ else if (TYPE_NEEDS_CONSTRUCTING (type)) { init = build_zero_init (type, NULL_TREE, /*static_storage_p=*/false); init = build2 (INIT_EXPR, type, exp, init); finish_expr_stmt (init); /* And then call the constructor. */ } /* If we don't need to mess with the constructor at all, then just zero out the object and we're done. */ else { init = build2 (INIT_EXPR, type, exp, build_value_init_noctor (type)); finish_expr_stmt (init); return; } init = NULL_TREE; } /* We know that expand_default_init can handle everything we want at this point. */ expand_default_init (binfo, true_exp, exp, init, flags, complain); } /* Report an error if TYPE is not a user-defined, class type. If OR_ELSE is nonzero, give an error message. */ int is_class_type (tree type, int or_else) { if (type == error_mark_node) return 0; if (! CLASS_TYPE_P (type)) { if (or_else) error ("%qT is not a class type", type); return 0; } return 1; } tree get_type_value (tree name) { if (name == error_mark_node) return NULL_TREE; if (IDENTIFIER_HAS_TYPE_VALUE (name)) return IDENTIFIER_TYPE_VALUE (name); else return NULL_TREE; } /* Build a reference to a member of an aggregate. This is not a C++ `&', but really something which can have its address taken, and then act as a pointer to member, for example TYPE :: FIELD can have its address taken by saying & TYPE :: FIELD. ADDRESS_P is true if this expression is the operand of "&". @@ Prints out lousy diagnostics for operator <typename> @@ fields. @@ This function should be rewritten and placed in search.c. */ tree build_offset_ref (tree type, tree member, bool address_p) { tree decl; tree basebinfo = NULL_TREE; /* class templates can come in as TEMPLATE_DECLs here. */ if (TREE_CODE (member) == TEMPLATE_DECL) return member; if (dependent_type_p (type) || type_dependent_expression_p (member)) return build_qualified_name (NULL_TREE, type, member, /*template_p=*/false); gcc_assert (TYPE_P (type)); if (! is_class_type (type, 1)) return error_mark_node; gcc_assert (DECL_P (member) || BASELINK_P (member)); /* Callers should call mark_used before this point. */ gcc_assert (!DECL_P (member) || TREE_USED (member)); if (!COMPLETE_TYPE_P (complete_type (type)) && !TYPE_BEING_DEFINED (type)) { error ("incomplete type %qT does not have member %qD", type, member); return error_mark_node; } /* Entities other than non-static members need no further processing. */ if (TREE_CODE (member) == TYPE_DECL) return member; if (TREE_CODE (member) == VAR_DECL || TREE_CODE (member) == CONST_DECL) return convert_from_reference (member); if (TREE_CODE (member) == FIELD_DECL && DECL_C_BIT_FIELD (member)) { error ("invalid pointer to bit-field %qD", member); return error_mark_node; } /* Set up BASEBINFO for member lookup. */ decl = maybe_dummy_object (type, &basebinfo); /* A lot of this logic is now handled in lookup_member. */ if (BASELINK_P (member)) { /* Go from the TREE_BASELINK to the member function info. */ tree t = BASELINK_FUNCTIONS (member); if (TREE_CODE (t) != TEMPLATE_ID_EXPR && !really_overloaded_fn (t)) { /* Get rid of a potential OVERLOAD around it. */ t = OVL_CURRENT (t); /* Unique functions are handled easily. */ /* For non-static member of base class, we need a special rule for access checking [class.protected]: If the access is to form a pointer to member, the nested-name-specifier shall name the derived class (or any class derived from that class). */ if (address_p && DECL_P (t) && DECL_NONSTATIC_MEMBER_P (t)) perform_or_defer_access_check (TYPE_BINFO (type), t, t); else perform_or_defer_access_check (basebinfo, t, t); if (DECL_STATIC_FUNCTION_P (t)) return t; member = t; } else TREE_TYPE (member) = unknown_type_node; } else if (address_p && TREE_CODE (member) == FIELD_DECL) /* We need additional test besides the one in check_accessibility_of_qualified_id in case it is a pointer to non-static member. */ perform_or_defer_access_check (TYPE_BINFO (type), member, member); if (!address_p) { /* If MEMBER is non-static, then the program has fallen afoul of [expr.prim]: An id-expression that denotes a nonstatic data member or nonstatic member function of a class can only be used: -- as part of a class member access (_expr.ref_) in which the object-expression refers to the member's class or a class derived from that class, or -- to form a pointer to member (_expr.unary.op_), or -- in the body of a nonstatic member function of that class or of a class derived from that class (_class.mfct.nonstatic_), or -- in a mem-initializer for a constructor for that class or for a class derived from that class (_class.base.init_). */ if (DECL_NONSTATIC_MEMBER_FUNCTION_P (member)) { /* Build a representation of the qualified name suitable for use as the operand to "&" -- even though the "&" is not actually present. */ member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member); /* In Microsoft mode, treat a non-static member function as if it were a pointer-to-member. */ if (flag_ms_extensions) { PTRMEM_OK_P (member) = 1; return cp_build_unary_op (ADDR_EXPR, member, 0, tf_warning_or_error); } error ("invalid use of non-static member function %qD", TREE_OPERAND (member, 1)); return error_mark_node; } else if (TREE_CODE (member) == FIELD_DECL) { error ("invalid use of non-static data member %qD", member); return error_mark_node; } return member; } member = build2 (OFFSET_REF, TREE_TYPE (member), decl, member); PTRMEM_OK_P (member) = 1; return member; } /* If DECL is a scalar enumeration constant or variable with a constant initializer, return the initializer (or, its initializers, recursively); otherwise, return DECL. If INTEGRAL_P, the initializer is only returned if DECL is an integral constant-expression. */ static tree constant_value_1 (tree decl, bool integral_p) { while (TREE_CODE (decl) == CONST_DECL || (integral_p ? DECL_INTEGRAL_CONSTANT_VAR_P (decl) : (TREE_CODE (decl) == VAR_DECL && CP_TYPE_CONST_NON_VOLATILE_P (TREE_TYPE (decl))))) { tree init; /* Static data members in template classes may have non-dependent initializers. References to such non-static data members are not value-dependent, so we must retrieve the initializer here. The DECL_INITIAL will have the right type, but will not have been folded because that would prevent us from performing all appropriate semantic checks at instantiation time. */ if (DECL_CLASS_SCOPE_P (decl) && CLASSTYPE_TEMPLATE_INFO (DECL_CONTEXT (decl)) && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl)))) { ++processing_template_decl; init = fold_non_dependent_expr (DECL_INITIAL (decl)); --processing_template_decl; } else { /* If DECL is a static data member in a template specialization, we must instantiate it here. The initializer for the static data member is not processed until needed; we need it now. */ mark_used (decl); init = DECL_INITIAL (decl); } if (init == error_mark_node) return decl; /* Initializers in templates are generally expanded during instantiation, so before that for const int i(2) INIT is a TREE_LIST with the actual initializer as TREE_VALUE. */ if (processing_template_decl && init && TREE_CODE (init) == TREE_LIST && TREE_CHAIN (init) == NULL_TREE) init = TREE_VALUE (init); if (!init || !TREE_TYPE (init) || (integral_p ? !INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (init)) : (!TREE_CONSTANT (init) /* Do not return an aggregate constant (of which string literals are a special case), as we do not want to make inadvertent copies of such entities, and we must be sure that their addresses are the same everywhere. */ || TREE_CODE (init) == CONSTRUCTOR || TREE_CODE (init) == STRING_CST))) break; decl = unshare_expr (init); } return decl; } /* If DECL is a CONST_DECL, or a constant VAR_DECL initialized by constant of integral or enumeration type, then return that value. These are those variables permitted in constant expressions by [5.19/1]. */ tree integral_constant_value (tree decl) { return constant_value_1 (decl, /*integral_p=*/true); } /* A more relaxed version of integral_constant_value, used by the common C/C++ code and by the C++ front end for optimization purposes. */ tree decl_constant_value (tree decl) { return constant_value_1 (decl, /*integral_p=*/processing_template_decl); } /* Common subroutines of build_new and build_vec_delete. */ /* Call the global __builtin_delete to delete ADDR. */ static tree build_builtin_delete_call (tree addr) { mark_used (global_delete_fndecl); return build_call_n (global_delete_fndecl, 1, addr); } /* Build and return a NEW_EXPR. If NELTS is non-NULL, TYPE[NELTS] is the type of the object being allocated; otherwise, it's just TYPE. INIT is the initializer, if any. USE_GLOBAL_NEW is true if the user explicitly wrote "::operator new". PLACEMENT, if non-NULL, is a vector of arguments to be provided as arguments to a placement new operator. This routine performs no semantic checks; it just creates and returns a NEW_EXPR. */ static tree build_raw_new_expr (VEC(tree,gc) *placement, tree type, tree nelts, VEC(tree,gc) *init, int use_global_new) { tree init_list; tree new_expr; /* If INIT is NULL, the we want to store NULL_TREE in the NEW_EXPR. If INIT is not NULL, then we want to store VOID_ZERO_NODE. This permits us to distinguish the case of a missing initializer "new int" from an empty initializer "new int()". */ if (init == NULL) init_list = NULL_TREE; else if (VEC_empty (tree, init)) init_list = void_zero_node; else init_list = build_tree_list_vec (init); new_expr = build4 (NEW_EXPR, build_pointer_type (type), build_tree_list_vec (placement), type, nelts, init_list); NEW_EXPR_USE_GLOBAL (new_expr) = use_global_new; TREE_SIDE_EFFECTS (new_expr) = 1; return new_expr; } /* Generate code for a new-expression, including calling the "operator new" function, initializing the object, and, if an exception occurs during construction, cleaning up. The arguments are as for build_raw_new_expr. This may change PLACEMENT and INIT. */ static tree build_new_1 (VEC(tree,gc) **placement, tree type, tree nelts, VEC(tree,gc) **init, bool globally_qualified_p, tsubst_flags_t complain) { tree size, rval; /* True iff this is a call to "operator new[]" instead of just "operator new". */ bool array_p = false; /* If ARRAY_P is true, the element type of the array. This is never an ARRAY_TYPE; for something like "new int[3][4]", the ELT_TYPE is "int". If ARRAY_P is false, this is the same type as TYPE. */ tree elt_type; /* The type of the new-expression. (This type is always a pointer type.) */ tree pointer_type; tree non_const_pointer_type; tree outer_nelts = NULL_TREE; tree alloc_call, alloc_expr; /* The address returned by the call to "operator new". This node is a VAR_DECL and is therefore reusable. */ tree alloc_node; tree alloc_fn; tree cookie_expr, init_expr; int nothrow, check_new; int use_java_new = 0; /* If non-NULL, the number of extra bytes to allocate at the beginning of the storage allocated for an array-new expression in order to store the number of elements. */ tree cookie_size = NULL_TREE; tree placement_first; tree placement_expr = NULL_TREE; /* True if the function we are calling is a placement allocation function. */ bool placement_allocation_fn_p; /* True if the storage must be initialized, either by a constructor or due to an explicit new-initializer. */ bool is_initialized; /* The address of the thing allocated, not including any cookie. In particular, if an array cookie is in use, DATA_ADDR is the address of the first array element. This node is a VAR_DECL, and is therefore reusable. */ tree data_addr; tree init_preeval_expr = NULL_TREE; if (nelts) { outer_nelts = nelts; array_p = true; } else if (TREE_CODE (type) == ARRAY_TYPE) { array_p = true; nelts = array_type_nelts_top (type); outer_nelts = nelts; type = TREE_TYPE (type); } /* If our base type is an array, then make sure we know how many elements it has. */ for (elt_type = type; TREE_CODE (elt_type) == ARRAY_TYPE; elt_type = TREE_TYPE (elt_type)) nelts = cp_build_binary_op (input_location, MULT_EXPR, nelts, array_type_nelts_top (elt_type), complain); if (TREE_CODE (elt_type) == VOID_TYPE) { if (complain & tf_error) error ("invalid type %<void%> for new"); return error_mark_node; } if (abstract_virtuals_error (NULL_TREE, elt_type)) return error_mark_node; is_initialized = (TYPE_NEEDS_CONSTRUCTING (elt_type) || *init != NULL); if (CP_TYPE_CONST_P (elt_type) && *init == NULL && !type_has_user_provided_default_constructor (elt_type)) { if (complain & tf_error) error ("uninitialized const in %<new%> of %q#T", elt_type); return error_mark_node; } size = size_in_bytes (elt_type); if (array_p) size = size_binop (MULT_EXPR, size, convert (sizetype, nelts)); alloc_fn = NULL_TREE; /* If PLACEMENT is a single simple pointer type not passed by reference, prepare to capture it in a temporary variable. Do this now, since PLACEMENT will change in the calls below. */ placement_first = NULL_TREE; if (VEC_length (tree, *placement) == 1 && (TREE_CODE (TREE_TYPE (VEC_index (tree, *placement, 0))) == POINTER_TYPE)) placement_first = VEC_index (tree, *placement, 0); /* Allocate the object. */ if (VEC_empty (tree, *placement) && TYPE_FOR_JAVA (elt_type)) { tree class_addr; tree class_decl = build_java_class_ref (elt_type); static const char alloc_name[] = "_Jv_AllocObject"; if (class_decl == error_mark_node) return error_mark_node; use_java_new = 1; if (!get_global_value_if_present (get_identifier (alloc_name), &alloc_fn)) { if (complain & tf_error) error ("call to Java constructor with %qs undefined", alloc_name); return error_mark_node; } else if (really_overloaded_fn (alloc_fn)) { if (complain & tf_error) error ("%qD should never be overloaded", alloc_fn); return error_mark_node; } alloc_fn = OVL_CURRENT (alloc_fn); class_addr = build1 (ADDR_EXPR, jclass_node, class_decl); alloc_call = (cp_build_function_call (alloc_fn, build_tree_list (NULL_TREE, class_addr), complain)); } else if (TYPE_FOR_JAVA (elt_type) && MAYBE_CLASS_TYPE_P (elt_type)) { error ("Java class %q#T object allocated using placement new", elt_type); return error_mark_node; } else { tree fnname; tree fns; fnname = ansi_opname (array_p ? VEC_NEW_EXPR : NEW_EXPR); if (!globally_qualified_p && CLASS_TYPE_P (elt_type) && (array_p ? TYPE_HAS_ARRAY_NEW_OPERATOR (elt_type) : TYPE_HAS_NEW_OPERATOR (elt_type))) { /* Use a class-specific operator new. */ /* If a cookie is required, add some extra space. */ if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type)) { cookie_size = targetm.cxx.get_cookie_size (elt_type); size = size_binop (PLUS_EXPR, size, cookie_size); } /* Create the argument list. */ VEC_safe_insert (tree, gc, *placement, 0, size); /* Do name-lookup to find the appropriate operator. */ fns = lookup_fnfields (elt_type, fnname, /*protect=*/2); if (fns == NULL_TREE) { if (complain & tf_error) error ("no suitable %qD found in class %qT", fnname, elt_type); return error_mark_node; } if (TREE_CODE (fns) == TREE_LIST) { if (complain & tf_error) { error ("request for member %qD is ambiguous", fnname); print_candidates (fns); } return error_mark_node; } alloc_call = build_new_method_call (build_dummy_object (elt_type), fns, placement, /*conversion_path=*/NULL_TREE, LOOKUP_NORMAL, &alloc_fn, complain); } else { /* Use a global operator new. */ /* See if a cookie might be required. */ if (array_p && TYPE_VEC_NEW_USES_COOKIE (elt_type)) cookie_size = targetm.cxx.get_cookie_size (elt_type); else cookie_size = NULL_TREE; alloc_call = build_operator_new_call (fnname, placement, &size, &cookie_size, &alloc_fn); } } if (alloc_call == error_mark_node) return error_mark_node; gcc_assert (alloc_fn != NULL_TREE); /* If we found a simple case of PLACEMENT_EXPR above, then copy it into a temporary variable. */ if (!processing_template_decl && placement_first != NULL_TREE && TREE_CODE (alloc_call) == CALL_EXPR && call_expr_nargs (alloc_call) == 2 && TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (alloc_call, 0))) == INTEGER_TYPE && TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (alloc_call, 1))) == POINTER_TYPE) { tree placement_arg = CALL_EXPR_ARG (alloc_call, 1); if (INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (TREE_TYPE (placement_arg))) || VOID_TYPE_P (TREE_TYPE (TREE_TYPE (placement_arg)))) { placement_expr = get_target_expr (placement_first); CALL_EXPR_ARG (alloc_call, 1) = convert (TREE_TYPE (placement_arg), placement_expr); } } /* In the simple case, we can stop now. */ pointer_type = build_pointer_type (type); if (!cookie_size && !is_initialized) return build_nop (pointer_type, alloc_call); /* Store the result of the allocation call in a variable so that we can use it more than once. */ alloc_expr = get_target_expr (alloc_call); alloc_node = TARGET_EXPR_SLOT (alloc_expr); /* Strip any COMPOUND_EXPRs from ALLOC_CALL. */ while (TREE_CODE (alloc_call) == COMPOUND_EXPR) alloc_call = TREE_OPERAND (alloc_call, 1); /* Now, check to see if this function is actually a placement allocation function. This can happen even when PLACEMENT is NULL because we might have something like: struct S { void* operator new (size_t, int i = 0); }; A call to `new S' will get this allocation function, even though there is no explicit placement argument. If there is more than one argument, or there are variable arguments, then this is a placement allocation function. */ placement_allocation_fn_p = (type_num_arguments (TREE_TYPE (alloc_fn)) > 1 || varargs_function_p (alloc_fn)); /* Preevaluate the placement args so that we don't reevaluate them for a placement delete. */ if (placement_allocation_fn_p) { tree inits; stabilize_call (alloc_call, &inits); if (inits) alloc_expr = build2 (COMPOUND_EXPR, TREE_TYPE (alloc_expr), inits, alloc_expr); } /* unless an allocation function is declared with an empty excep- tion-specification (_except.spec_), throw(), it indicates failure to allocate storage by throwing a bad_alloc exception (clause _except_, _lib.bad.alloc_); it returns a non-null pointer otherwise If the allo- cation function is declared with an empty exception-specification, throw(), it returns null to indicate failure to allocate storage and a non-null pointer otherwise. So check for a null exception spec on the op new we just called. */ nothrow = TYPE_NOTHROW_P (TREE_TYPE (alloc_fn)); check_new = (flag_check_new || nothrow) && ! use_java_new; if (cookie_size) { tree cookie; tree cookie_ptr; tree size_ptr_type; /* Adjust so we're pointing to the start of the object. */ data_addr = build2 (POINTER_PLUS_EXPR, TREE_TYPE (alloc_node), alloc_node, cookie_size); /* Store the number of bytes allocated so that we can know how many elements to destroy later. We use the last sizeof (size_t) bytes to store the number of elements. */ cookie_ptr = size_binop (MINUS_EXPR, cookie_size, size_in_bytes (sizetype)); cookie_ptr = fold_build2_loc (input_location, POINTER_PLUS_EXPR, TREE_TYPE (alloc_node), alloc_node, cookie_ptr); size_ptr_type = build_pointer_type (sizetype); cookie_ptr = fold_convert (size_ptr_type, cookie_ptr); cookie = cp_build_indirect_ref (cookie_ptr, RO_NULL, complain); cookie_expr = build2 (MODIFY_EXPR, sizetype, cookie, nelts); if (targetm.cxx.cookie_has_size ()) { /* Also store the element size. */ cookie_ptr = build2 (POINTER_PLUS_EXPR, size_ptr_type, cookie_ptr, fold_build1_loc (input_location, NEGATE_EXPR, sizetype, size_in_bytes (sizetype))); cookie = cp_build_indirect_ref (cookie_ptr, RO_NULL, complain); cookie = build2 (MODIFY_EXPR, sizetype, cookie, size_in_bytes (elt_type)); cookie_expr = build2 (COMPOUND_EXPR, TREE_TYPE (cookie_expr), cookie, cookie_expr); } } else { cookie_expr = NULL_TREE; data_addr = alloc_node; } /* Now use a pointer to the type we've actually allocated. */ /* But we want to operate on a non-const version to start with, since we'll be modifying the elements. */ non_const_pointer_type = build_pointer_type (cp_build_qualified_type (type, TYPE_QUALS (type) & ~TYPE_QUAL_CONST)); data_addr = fold_convert (non_const_pointer_type, data_addr); /* Any further uses of alloc_node will want this type, too. */ alloc_node = fold_convert (non_const_pointer_type, alloc_node); /* Now initialize the allocated object. Note that we preevaluate the initialization expression, apart from the actual constructor call or assignment--we do this because we want to delay the allocation as long as possible in order to minimize the size of the exception region for placement delete. */ if (is_initialized) { bool stable; bool explicit_value_init_p = false; if (*init != NULL && VEC_empty (tree, *init)) { *init = NULL; explicit_value_init_p = true; } if (array_p) { tree vecinit = NULL_TREE; if (*init && VEC_length (tree, *init) == 1 && BRACE_ENCLOSED_INITIALIZER_P (VEC_index (tree, *init, 0)) && CONSTRUCTOR_IS_DIRECT_INIT (VEC_index (tree, *init, 0))) { tree arraytype, domain; vecinit = VEC_index (tree, *init, 0); if (TREE_CONSTANT (nelts)) domain = compute_array_index_type (NULL_TREE, nelts); else { domain = NULL_TREE; if (CONSTRUCTOR_NELTS (vecinit) > 0) warning (0, "non-constant array size in new, unable to " "verify length of initializer-list"); } arraytype = build_cplus_array_type (type, domain); vecinit = digest_init (arraytype, vecinit); } else if (*init) { if (complain & tf_error) permerror (input_location, "ISO C++ forbids initialization in array new"); else return error_mark_node; vecinit = build_tree_list_vec (*init); } init_expr = build_vec_init (data_addr, cp_build_binary_op (input_location, MINUS_EXPR, outer_nelts, integer_one_node, complain), vecinit, explicit_value_init_p, /*from_array=*/0, complain); /* An array initialization is stable because the initialization of each element is a full-expression, so the temporaries don't leak out. */ stable = true; } else { init_expr = cp_build_indirect_ref (data_addr, RO_NULL, complain); if (TYPE_NEEDS_CONSTRUCTING (type) && (!explicit_value_init_p || processing_template_decl)) { init_expr = build_special_member_call (init_expr, complete_ctor_identifier, init, elt_type, LOOKUP_NORMAL, complain); } else if (explicit_value_init_p) { if (processing_template_decl) /* Don't worry about it, we'll handle this properly at instantiation time. */; else /* Something like `new int()'. */ init_expr = build2 (INIT_EXPR, type, init_expr, build_value_init (type)); } else { tree ie; /* We are processing something like `new int (10)', which means allocate an int, and initialize it with 10. */ ie = build_x_compound_expr_from_vec (*init, "new initializer"); init_expr = cp_build_modify_expr (init_expr, INIT_EXPR, ie, complain); } stable = stabilize_init (init_expr, &init_preeval_expr); } if (init_expr == error_mark_node) return error_mark_node; /* If any part of the object initialization terminates by throwing an exception and a suitable deallocation function can be found, the deallocation function is called to free the memory in which the object was being constructed, after which the exception continues to propagate in the context of the new-expression. If no unambiguous matching deallocation function can be found, propagating the exception does not cause the object's memory to be freed. */ if (flag_exceptions && ! use_java_new) { enum tree_code dcode = array_p ? VEC_DELETE_EXPR : DELETE_EXPR; tree cleanup; /* The Standard is unclear here, but the right thing to do is to use the same method for finding deallocation functions that we use for finding allocation functions. */ cleanup = (build_op_delete_call (dcode, alloc_node, size, globally_qualified_p, placement_allocation_fn_p ? alloc_call : NULL_TREE, alloc_fn)); if (!cleanup) /* We're done. */; else if (stable) /* This is much simpler if we were able to preevaluate all of the arguments to the constructor call. */ { /* CLEANUP is compiler-generated, so no diagnostics. */ TREE_NO_WARNING (cleanup) = true; init_expr = build2 (TRY_CATCH_EXPR, void_type_node, init_expr, cleanup); /* Likewise, this try-catch is compiler-generated. */ TREE_NO_WARNING (init_expr) = true; } else /* Ack! First we allocate the memory. Then we set our sentry variable to true, and expand a cleanup that deletes the memory if sentry is true. Then we run the constructor, and finally clear the sentry. We need to do this because we allocate the space first, so if there are any temporaries with cleanups in the constructor args and we weren't able to preevaluate them, we need this EH region to extend until end of full-expression to preserve nesting. */ { tree end, sentry, begin; begin = get_target_expr (boolean_true_node); CLEANUP_EH_ONLY (begin) = 1; sentry = TARGET_EXPR_SLOT (begin); /* CLEANUP is compiler-generated, so no diagnostics. */ TREE_NO_WARNING (cleanup) = true; TARGET_EXPR_CLEANUP (begin) = build3 (COND_EXPR, void_type_node, sentry, cleanup, void_zero_node); end = build2 (MODIFY_EXPR, TREE_TYPE (sentry), sentry, boolean_false_node); init_expr = build2 (COMPOUND_EXPR, void_type_node, begin, build2 (COMPOUND_EXPR, void_type_node, init_expr, end)); /* Likewise, this is compiler-generated. */ TREE_NO_WARNING (init_expr) = true; } } } else init_expr = NULL_TREE; /* Now build up the return value in reverse order. */ rval = data_addr; if (init_expr) rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_expr, rval); if (cookie_expr) rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), cookie_expr, rval); if (rval == data_addr) /* If we don't have an initializer or a cookie, strip the TARGET_EXPR and return the call (which doesn't need to be adjusted). */ rval = TARGET_EXPR_INITIAL (alloc_expr); else { if (check_new) { tree ifexp = cp_build_binary_op (input_location, NE_EXPR, alloc_node, integer_zero_node, complain); rval = build_conditional_expr (ifexp, rval, alloc_node, complain); } /* Perform the allocation before anything else, so that ALLOC_NODE has been initialized before we start using it. */ rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), alloc_expr, rval); } if (init_preeval_expr) rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), init_preeval_expr, rval); /* A new-expression is never an lvalue. */ gcc_assert (!lvalue_p (rval)); return convert (pointer_type, rval); } /* Generate a representation for a C++ "new" expression. *PLACEMENT is a vector of placement-new arguments (or NULL if none). If NELTS is NULL, TYPE is the type of the storage to be allocated. If NELTS is not NULL, then this is an array-new allocation; TYPE is the type of the elements in the array and NELTS is the number of elements in the array. *INIT, if non-NULL, is the initializer for the new object, or an empty vector to indicate an initializer of "()". If USE_GLOBAL_NEW is true, then the user explicitly wrote "::new" rather than just "new". This may change PLACEMENT and INIT. */ tree build_new (VEC(tree,gc) **placement, tree type, tree nelts, VEC(tree,gc) **init, int use_global_new, tsubst_flags_t complain) { tree rval; VEC(tree,gc) *orig_placement = NULL; tree orig_nelts = NULL_TREE; VEC(tree,gc) *orig_init = NULL; if (type == error_mark_node) return error_mark_node; if (nelts == NULL_TREE && VEC_length (tree, *init) == 1) { tree auto_node = type_uses_auto (type); if (auto_node && describable_type (VEC_index (tree, *init, 0))) type = do_auto_deduction (type, VEC_index (tree, *init, 0), auto_node); } if (processing_template_decl) { if (dependent_type_p (type) || any_type_dependent_arguments_p (*placement) || (nelts && type_dependent_expression_p (nelts)) || any_type_dependent_arguments_p (*init)) return build_raw_new_expr (*placement, type, nelts, *init, use_global_new); orig_placement = make_tree_vector_copy (*placement); orig_nelts = nelts; orig_init = make_tree_vector_copy (*init); make_args_non_dependent (*placement); if (nelts) nelts = build_non_dependent_expr (nelts); make_args_non_dependent (*init); } if (nelts) { if (!build_expr_type_conversion (WANT_INT | WANT_ENUM, nelts, false)) { if (complain & tf_error) permerror (input_location, "size in array new must have integral type"); else return error_mark_node; } nelts = cp_save_expr (cp_convert (sizetype, nelts)); } /* ``A reference cannot be created by the new operator. A reference is not an object (8.2.2, 8.4.3), so a pointer to it could not be returned by new.'' ARM 5.3.3 */ if (TREE_CODE (type) == REFERENCE_TYPE) { if (complain & tf_error) error ("new cannot be applied to a reference type"); else return error_mark_node; type = TREE_TYPE (type); } if (TREE_CODE (type) == FUNCTION_TYPE) { if (complain & tf_error) error ("new cannot be applied to a function type"); return error_mark_node; } /* The type allocated must be complete. If the new-type-id was "T[N]" then we are just checking that "T" is complete here, but that is equivalent, since the value of "N" doesn't matter. */ if (!complete_type_or_else (type, NULL_TREE)) return error_mark_node; rval = build_new_1 (placement, type, nelts, init, use_global_new, complain); if (rval == error_mark_node) return error_mark_node; if (processing_template_decl) { tree ret = build_raw_new_expr (orig_placement, type, orig_nelts, orig_init, use_global_new); release_tree_vector (orig_placement); release_tree_vector (orig_init); return ret; } /* Wrap it in a NOP_EXPR so warn_if_unused_value doesn't complain. */ rval = build1 (NOP_EXPR, TREE_TYPE (rval), rval); TREE_NO_WARNING (rval) = 1; return rval; } /* Given a Java class, return a decl for the corresponding java.lang.Class. */ tree build_java_class_ref (tree type) { tree name = NULL_TREE, class_decl; static tree CL_suffix = NULL_TREE; if (CL_suffix == NULL_TREE) CL_suffix = get_identifier("class$"); if (jclass_node == NULL_TREE) { jclass_node = IDENTIFIER_GLOBAL_VALUE (get_identifier ("jclass")); if (jclass_node == NULL_TREE) { error ("call to Java constructor, while %<jclass%> undefined"); return error_mark_node; } jclass_node = TREE_TYPE (jclass_node); } /* Mangle the class$ field. */ { tree field; for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) if (DECL_NAME (field) == CL_suffix) { mangle_decl (field); name = DECL_ASSEMBLER_NAME (field); break; } if (!field) { error ("can't find %<class$%> in %qT", type); return error_mark_node; } } class_decl = IDENTIFIER_GLOBAL_VALUE (name); if (class_decl == NULL_TREE) { class_decl = build_decl (input_location, VAR_DECL, name, TREE_TYPE (jclass_node)); TREE_STATIC (class_decl) = 1; DECL_EXTERNAL (class_decl) = 1; TREE_PUBLIC (class_decl) = 1; DECL_ARTIFICIAL (class_decl) = 1; DECL_IGNORED_P (class_decl) = 1; pushdecl_top_level (class_decl); make_decl_rtl (class_decl); } return class_decl; } static tree build_vec_delete_1 (tree base, tree maxindex, tree type, special_function_kind auto_delete_vec, int use_global_delete) { tree virtual_size; tree ptype = build_pointer_type (type = complete_type (type)); tree size_exp = size_in_bytes (type); /* Temporary variables used by the loop. */ tree tbase, tbase_init; /* This is the body of the loop that implements the deletion of a single element, and moves temp variables to next elements. */ tree body; /* This is the LOOP_EXPR that governs the deletion of the elements. */ tree loop = 0; /* This is the thing that governs what to do after the loop has run. */ tree deallocate_expr = 0; /* This is the BIND_EXPR which holds the outermost iterator of the loop. It is convenient to set this variable up and test it before executing any other code in the loop. This is also the containing expression returned by this function. */ tree controller = NULL_TREE; tree tmp; /* We should only have 1-D arrays here. */ gcc_assert (TREE_CODE (type) != ARRAY_TYPE); if (! MAYBE_CLASS_TYPE_P (type) || TYPE_HAS_TRIVIAL_DESTRUCTOR (type)) goto no_destructor; /* The below is short by the cookie size. */ virtual_size = size_binop (MULT_EXPR, size_exp, convert (sizetype, maxindex)); tbase = create_temporary_var (ptype); tbase_init = cp_build_modify_expr (tbase, NOP_EXPR, fold_build2_loc (input_location, POINTER_PLUS_EXPR, ptype, fold_convert (ptype, base), virtual_size), tf_warning_or_error); controller = build3 (BIND_EXPR, void_type_node, tbase, NULL_TREE, NULL_TREE); TREE_SIDE_EFFECTS (controller) = 1; body = build1 (EXIT_EXPR, void_type_node, build2 (EQ_EXPR, boolean_type_node, tbase, fold_convert (ptype, base))); tmp = fold_build1_loc (input_location, NEGATE_EXPR, sizetype, size_exp); body = build_compound_expr (input_location, body, cp_build_modify_expr (tbase, NOP_EXPR, build2 (POINTER_PLUS_EXPR, ptype, tbase, tmp), tf_warning_or_error)); body = build_compound_expr (input_location, body, build_delete (ptype, tbase, sfk_complete_destructor, LOOKUP_NORMAL|LOOKUP_DESTRUCTOR, 1)); loop = build1 (LOOP_EXPR, void_type_node, body); loop = build_compound_expr (input_location, tbase_init, loop); no_destructor: /* If the delete flag is one, or anything else with the low bit set, delete the storage. */ if (auto_delete_vec != sfk_base_destructor) { tree base_tbd; /* The below is short by the cookie size. */ virtual_size = size_binop (MULT_EXPR, size_exp, convert (sizetype, maxindex)); if (! TYPE_VEC_NEW_USES_COOKIE (type)) /* no header */ base_tbd = base; else { tree cookie_size; cookie_size = targetm.cxx.get_cookie_size (type); base_tbd = cp_convert (ptype, cp_build_binary_op (input_location, MINUS_EXPR, cp_convert (string_type_node, base), cookie_size, tf_warning_or_error)); /* True size with header. */ virtual_size = size_binop (PLUS_EXPR, virtual_size, cookie_size); } if (auto_delete_vec == sfk_deleting_destructor) deallocate_expr = build_op_delete_call (VEC_DELETE_EXPR, base_tbd, virtual_size, use_global_delete & 1, /*placement=*/NULL_TREE, /*alloc_fn=*/NULL_TREE); } body = loop; if (!deallocate_expr) ; else if (!body) body = deallocate_expr; else body = build_compound_expr (input_location, body, deallocate_expr); if (!body) body = integer_zero_node; /* Outermost wrapper: If pointer is null, punt. */ body = fold_build3_loc (input_location, COND_EXPR, void_type_node, fold_build2_loc (input_location, NE_EXPR, boolean_type_node, base, convert (TREE_TYPE (base), integer_zero_node)), body, integer_zero_node); body = build1 (NOP_EXPR, void_type_node, body); if (controller) { TREE_OPERAND (controller, 1) = body; body = controller; } if (TREE_CODE (base) == SAVE_EXPR) /* Pre-evaluate the SAVE_EXPR outside of the BIND_EXPR. */ body = build2 (COMPOUND_EXPR, void_type_node, base, body); return convert_to_void (body, /*implicit=*/NULL, tf_warning_or_error); } /* Create an unnamed variable of the indicated TYPE. */ tree create_temporary_var (tree type) { tree decl; decl = build_decl (input_location, VAR_DECL, NULL_TREE, type); TREE_USED (decl) = 1; DECL_ARTIFICIAL (decl) = 1; DECL_IGNORED_P (decl) = 1; DECL_CONTEXT (decl) = current_function_decl; return decl; } /* Create a new temporary variable of the indicated TYPE, initialized to INIT. It is not entered into current_binding_level, because that breaks things when it comes time to do final cleanups (which take place "outside" the binding contour of the function). */ static tree get_temp_regvar (tree type, tree init) { tree decl; decl = create_temporary_var (type); add_decl_expr (decl); finish_expr_stmt (cp_build_modify_expr (decl, INIT_EXPR, init, tf_warning_or_error)); return decl; } /* `build_vec_init' returns tree structure that performs initialization of a vector of aggregate types. BASE is a reference to the vector, of ARRAY_TYPE, or a pointer to the first element, of POINTER_TYPE. MAXINDEX is the maximum index of the array (one less than the number of elements). It is only used if BASE is a pointer or TYPE_DOMAIN (TREE_TYPE (BASE)) == NULL_TREE. INIT is the (possibly NULL) initializer. If EXPLICIT_VALUE_INIT_P is true, then INIT must be NULL. All elements in the array are value-initialized. FROM_ARRAY is 0 if we should init everything with INIT (i.e., every element initialized from INIT). FROM_ARRAY is 1 if we should index into INIT in parallel with initialization of DECL. FROM_ARRAY is 2 if we should index into INIT in parallel, but use assignment instead of initialization. */ tree build_vec_init (tree base, tree maxindex, tree init, bool explicit_value_init_p, int from_array, tsubst_flags_t complain) { tree rval; tree base2 = NULL_TREE; tree itype = NULL_TREE; tree iterator; /* The type of BASE. */ tree atype = TREE_TYPE (base); /* The type of an element in the array. */ tree type = TREE_TYPE (atype); /* The element type reached after removing all outer array types. */ tree inner_elt_type; /* The type of a pointer to an element in the array. */ tree ptype; tree stmt_expr; tree compound_stmt; int destroy_temps; tree try_block = NULL_TREE; int num_initialized_elts = 0; bool is_global; if (TREE_CODE (atype) == ARRAY_TYPE && TYPE_DOMAIN (atype)) maxindex = array_type_nelts (atype); if (maxindex == NULL_TREE || maxindex == error_mark_node) return error_mark_node; if (explicit_value_init_p) gcc_assert (!init); inner_elt_type = strip_array_types (type); /* Look through the TARGET_EXPR around a compound literal. */ if (init && TREE_CODE (init) == TARGET_EXPR && TREE_CODE (TARGET_EXPR_INITIAL (init)) == CONSTRUCTOR && from_array != 2) init = TARGET_EXPR_INITIAL (init); if (init && TREE_CODE (atype) == ARRAY_TYPE && (from_array == 2 ? (!CLASS_TYPE_P (inner_elt_type) || !TYPE_HAS_COMPLEX_ASSIGN_REF (inner_elt_type)) : !TYPE_NEEDS_CONSTRUCTING (type)) && ((TREE_CODE (init) == CONSTRUCTOR /* Don't do this if the CONSTRUCTOR might contain something that might throw and require us to clean up. */ && (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)) || ! TYPE_HAS_NONTRIVIAL_DESTRUCTOR (inner_elt_type))) || from_array)) { /* Do non-default initialization of trivial arrays resulting from brace-enclosed initializers. In this case, digest_init and store_constructor will handle the semantics for us. */ stmt_expr = build2 (INIT_EXPR, atype, base, init); return stmt_expr; } maxindex = cp_convert (ptrdiff_type_node, maxindex); if (TREE_CODE (atype) == ARRAY_TYPE) { ptype = build_pointer_type (type); base = cp_convert (ptype, decay_conversion (base)); } else ptype = atype; /* The code we are generating looks like: ({ T* t1 = (T*) base; T* rval = t1; ptrdiff_t iterator = maxindex; try { for (; iterator != -1; --iterator) { ... initialize *t1 ... ++t1; } } catch (...) { ... destroy elements that were constructed ... } rval; }) We can omit the try and catch blocks if we know that the initialization will never throw an exception, or if the array elements do not have destructors. We can omit the loop completely if the elements of the array do not have constructors. We actually wrap the entire body of the above in a STMT_EXPR, for tidiness. When copying from array to another, when the array elements have only trivial copy constructors, we should use __builtin_memcpy rather than generating a loop. That way, we could take advantage of whatever cleverness the back end has for dealing with copies of blocks of memory. */ is_global = begin_init_stmts (&stmt_expr, &compound_stmt); destroy_temps = stmts_are_full_exprs_p (); current_stmt_tree ()->stmts_are_full_exprs_p = 0; rval = get_temp_regvar (ptype, base); base = get_temp_regvar (ptype, rval); iterator = get_temp_regvar (ptrdiff_type_node, maxindex); /* If initializing one array from another, initialize element by element. We rely upon the below calls to do the argument checking. Evaluate the initializer before entering the try block. */ if (from_array && init && TREE_CODE (init) != CONSTRUCTOR) { base2 = decay_conversion (init); itype = TREE_TYPE (base2); base2 = get_temp_regvar (itype, base2); itype = TREE_TYPE (itype); } /* Protect the entire array initialization so that we can destroy the partially constructed array if an exception is thrown. But don't do this if we're assigning. */ if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) && from_array != 2) { try_block = begin_try_block (); } if (init != NULL_TREE && TREE_CODE (init) == CONSTRUCTOR) { /* Do non-default initialization of non-trivial arrays resulting from brace-enclosed initializers. */ unsigned HOST_WIDE_INT idx; tree elt; from_array = 0; FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init), idx, elt) { tree baseref = build1 (INDIRECT_REF, type, base); num_initialized_elts++; current_stmt_tree ()->stmts_are_full_exprs_p = 1; if (MAYBE_CLASS_TYPE_P (type) || TREE_CODE (type) == ARRAY_TYPE) finish_expr_stmt (build_aggr_init (baseref, elt, 0, complain)); else finish_expr_stmt (cp_build_modify_expr (baseref, NOP_EXPR, elt, complain)); current_stmt_tree ()->stmts_are_full_exprs_p = 0; finish_expr_stmt (cp_build_unary_op (PREINCREMENT_EXPR, base, 0, complain)); finish_expr_stmt (cp_build_unary_op (PREDECREMENT_EXPR, iterator, 0, complain)); } /* Clear out INIT so that we don't get confused below. */ init = NULL_TREE; } else if (from_array) { if (init) /* OK, we set base2 above. */; else if (TYPE_LANG_SPECIFIC (type) && TYPE_NEEDS_CONSTRUCTING (type) && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) { if (complain & tf_error) error ("initializer ends prematurely"); return error_mark_node; } } /* Now, default-initialize any remaining elements. We don't need to do that if a) the type does not need constructing, or b) we've already initialized all the elements. We do need to keep going if we're copying an array. */ if (from_array || ((TYPE_NEEDS_CONSTRUCTING (type) || explicit_value_init_p) && ! (host_integerp (maxindex, 0) && (num_initialized_elts == tree_low_cst (maxindex, 0) + 1)))) { /* If the ITERATOR is equal to -1, then we don't have to loop; we've already initialized all the elements. */ tree for_stmt; tree elt_init; tree to; for_stmt = begin_for_stmt (); finish_for_init_stmt (for_stmt); finish_for_cond (build2 (NE_EXPR, boolean_type_node, iterator, build_int_cst (TREE_TYPE (iterator), -1)), for_stmt); finish_for_expr (cp_build_unary_op (PREDECREMENT_EXPR, iterator, 0, complain), for_stmt); to = build1 (INDIRECT_REF, type, base); if (from_array) { tree from; if (base2) from = build1 (INDIRECT_REF, itype, base2); else from = NULL_TREE; if (from_array == 2) elt_init = cp_build_modify_expr (to, NOP_EXPR, from, complain); else if (TYPE_NEEDS_CONSTRUCTING (type)) elt_init = build_aggr_init (to, from, 0, complain); else if (from) elt_init = cp_build_modify_expr (to, NOP_EXPR, from, complain); else gcc_unreachable (); } else if (TREE_CODE (type) == ARRAY_TYPE) { if (init != 0) sorry ("cannot initialize multi-dimensional array with initializer"); elt_init = build_vec_init (build1 (INDIRECT_REF, type, base), 0, 0, explicit_value_init_p, 0, complain); } else if (explicit_value_init_p) elt_init = build2 (INIT_EXPR, type, to, build_value_init (type)); else { gcc_assert (TYPE_NEEDS_CONSTRUCTING (type)); elt_init = build_aggr_init (to, init, 0, complain); } current_stmt_tree ()->stmts_are_full_exprs_p = 1; finish_expr_stmt (elt_init); current_stmt_tree ()->stmts_are_full_exprs_p = 0; finish_expr_stmt (cp_build_unary_op (PREINCREMENT_EXPR, base, 0, complain)); if (base2) finish_expr_stmt (cp_build_unary_op (PREINCREMENT_EXPR, base2, 0, complain)); finish_for_stmt (for_stmt); } /* Make sure to cleanup any partially constructed elements. */ if (flag_exceptions && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type) && from_array != 2) { tree e; tree m = cp_build_binary_op (input_location, MINUS_EXPR, maxindex, iterator, complain); /* Flatten multi-dimensional array since build_vec_delete only expects one-dimensional array. */ if (TREE_CODE (type) == ARRAY_TYPE) m = cp_build_binary_op (input_location, MULT_EXPR, m, array_type_nelts_total (type), complain); finish_cleanup_try_block (try_block); e = build_vec_delete_1 (rval, m, inner_elt_type, sfk_base_destructor, /*use_global_delete=*/0); finish_cleanup (e, try_block); } /* The value of the array initialization is the array itself, RVAL is a pointer to the first element. */ finish_stmt_expr_expr (rval, stmt_expr); stmt_expr = finish_init_stmts (is_global, stmt_expr, compound_stmt); /* Now make the result have the correct type. */ if (TREE_CODE (atype) == ARRAY_TYPE) { atype = build_pointer_type (atype); stmt_expr = build1 (NOP_EXPR, atype, stmt_expr); stmt_expr = cp_build_indirect_ref (stmt_expr, RO_NULL, complain); TREE_NO_WARNING (stmt_expr) = 1; } current_stmt_tree ()->stmts_are_full_exprs_p = destroy_temps; return stmt_expr; } /* Call the DTOR_KIND destructor for EXP. FLAGS are as for build_delete. */ static tree build_dtor_call (tree exp, special_function_kind dtor_kind, int flags) { tree name; tree fn; switch (dtor_kind) { case sfk_complete_destructor: name = complete_dtor_identifier; break; case sfk_base_destructor: name = base_dtor_identifier; break; case sfk_deleting_destructor: name = deleting_dtor_identifier; break; default: gcc_unreachable (); } fn = lookup_fnfields (TREE_TYPE (exp), name, /*protect=*/2); return build_new_method_call (exp, fn, /*args=*/NULL, /*conversion_path=*/NULL_TREE, flags, /*fn_p=*/NULL, tf_warning_or_error); } /* Generate a call to a destructor. TYPE is the type to cast ADDR to. ADDR is an expression which yields the store to be destroyed. AUTO_DELETE is the name of the destructor to call, i.e., either sfk_complete_destructor, sfk_base_destructor, or sfk_deleting_destructor. FLAGS is the logical disjunction of zero or more LOOKUP_ flags. See cp-tree.h for more info. */ tree build_delete (tree type, tree addr, special_function_kind auto_delete, int flags, int use_global_delete) { tree expr; if (addr == error_mark_node) return error_mark_node; /* Can happen when CURRENT_EXCEPTION_OBJECT gets its type set to `error_mark_node' before it gets properly cleaned up. */ if (type == error_mark_node) return error_mark_node; type = TYPE_MAIN_VARIANT (type); if (TREE_CODE (type) == POINTER_TYPE) { bool complete_p = true; type = TYPE_MAIN_VARIANT (TREE_TYPE (type)); if (TREE_CODE (type) == ARRAY_TYPE) goto handle_array; /* We don't want to warn about delete of void*, only other incomplete types. Deleting other incomplete types invokes undefined behavior, but it is not ill-formed, so compile to something that would even do The Right Thing (TM) should the type have a trivial dtor and no delete operator. */ if (!VOID_TYPE_P (type)) { complete_type (type); if (!COMPLETE_TYPE_P (type)) { if (warning (0, "possible problem detected in invocation of " "delete operator:")) { cxx_incomplete_type_diagnostic (addr, type, DK_WARNING); inform (input_location, "neither the destructor nor the class-specific " "operator delete will be called, even if they are " "declared when the class is defined."); } complete_p = false; } } if (VOID_TYPE_P (type) || !complete_p || !MAYBE_CLASS_TYPE_P (type)) /* Call the builtin operator delete. */ return build_builtin_delete_call (addr); if (TREE_SIDE_EFFECTS (addr)) addr = save_expr (addr); /* Throw away const and volatile on target type of addr. */ addr = convert_force (build_pointer_type (type), addr, 0); } else if (TREE_CODE (type) == ARRAY_TYPE) { handle_array: if (TYPE_DOMAIN (type) == NULL_TREE) { error ("unknown array size in delete"); return error_mark_node; } return build_vec_delete (addr, array_type_nelts (type), auto_delete, use_global_delete); } else { /* Don't check PROTECT here; leave that decision to the destructor. If the destructor is accessible, call it, else report error. */ addr = cp_build_unary_op (ADDR_EXPR, addr, 0, tf_warning_or_error); if (TREE_SIDE_EFFECTS (addr)) addr = save_expr (addr); addr = convert_force (build_pointer_type (type), addr, 0); } gcc_assert (MAYBE_CLASS_TYPE_P (type)); if (TYPE_HAS_TRIVIAL_DESTRUCTOR (type)) { if (auto_delete != sfk_deleting_destructor) return void_zero_node; return build_op_delete_call (DELETE_EXPR, addr, cxx_sizeof_nowarn (type), use_global_delete, /*placement=*/NULL_TREE, /*alloc_fn=*/NULL_TREE); } else { tree head = NULL_TREE; tree do_delete = NULL_TREE; tree ifexp; if (CLASSTYPE_LAZY_DESTRUCTOR (type)) lazily_declare_fn (sfk_destructor, type); /* For `::delete x', we must not use the deleting destructor since then we would not be sure to get the global `operator delete'. */ if (use_global_delete && auto_delete == sfk_deleting_destructor) { /* We will use ADDR multiple times so we must save it. */ addr = save_expr (addr); head = get_target_expr (build_headof (addr)); /* Delete the object. */ do_delete = build_builtin_delete_call (head); /* Otherwise, treat this like a complete object destructor call. */ auto_delete = sfk_complete_destructor; } /* If the destructor is non-virtual, there is no deleting variant. Instead, we must explicitly call the appropriate `operator delete' here. */ else if (!DECL_VIRTUAL_P (CLASSTYPE_DESTRUCTORS (type)) && auto_delete == sfk_deleting_destructor) { /* We will use ADDR multiple times so we must save it. */ addr = save_expr (addr); /* Build the call. */ do_delete = build_op_delete_call (DELETE_EXPR, addr, cxx_sizeof_nowarn (type), /*global_p=*/false, /*placement=*/NULL_TREE, /*alloc_fn=*/NULL_TREE); /* Call the complete object destructor. */ auto_delete = sfk_complete_destructor; } else if (auto_delete == sfk_deleting_destructor && TYPE_GETS_REG_DELETE (type)) { /* Make sure we have access to the member op delete, even though we'll actually be calling it from the destructor. */ build_op_delete_call (DELETE_EXPR, addr, cxx_sizeof_nowarn (type), /*global_p=*/false, /*placement=*/NULL_TREE, /*alloc_fn=*/NULL_TREE); } expr = build_dtor_call (cp_build_indirect_ref (addr, RO_NULL, tf_warning_or_error), auto_delete, flags); if (do_delete) expr = build2 (COMPOUND_EXPR, void_type_node, expr, do_delete); /* We need to calculate this before the dtor changes the vptr. */ if (head) expr = build2 (COMPOUND_EXPR, void_type_node, head, expr); if (flags & LOOKUP_DESTRUCTOR) /* Explicit destructor call; don't check for null pointer. */ ifexp = integer_one_node; else /* Handle deleting a null pointer. */ ifexp = fold (cp_build_binary_op (input_location, NE_EXPR, addr, integer_zero_node, tf_warning_or_error)); if (ifexp != integer_one_node) expr = build3 (COND_EXPR, void_type_node, ifexp, expr, void_zero_node); return expr; } } /* At the beginning of a destructor, push cleanups that will call the destructors for our base classes and members. Called from begin_destructor_body. */ void push_base_cleanups (void) { tree binfo, base_binfo; int i; tree member; tree expr; VEC(tree,gc) *vbases; /* Run destructors for all virtual baseclasses. */ if (CLASSTYPE_VBASECLASSES (current_class_type)) { tree cond = (condition_conversion (build2 (BIT_AND_EXPR, integer_type_node, current_in_charge_parm, integer_two_node))); /* The CLASSTYPE_VBASECLASSES vector is in initialization order, which is also the right order for pushing cleanups. */ for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0; VEC_iterate (tree, vbases, i, base_binfo); i++) { if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo))) { expr = build_special_member_call (current_class_ref, base_dtor_identifier, NULL, base_binfo, (LOOKUP_NORMAL | LOOKUP_NONVIRTUAL), tf_warning_or_error); expr = build3 (COND_EXPR, void_type_node, cond, expr, void_zero_node); finish_decl_cleanup (NULL_TREE, expr); } } } /* Take care of the remaining baseclasses. */ for (binfo = TYPE_BINFO (current_class_type), i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) { if (TYPE_HAS_TRIVIAL_DESTRUCTOR (BINFO_TYPE (base_binfo)) || BINFO_VIRTUAL_P (base_binfo)) continue; expr = build_special_member_call (current_class_ref, base_dtor_identifier, NULL, base_binfo, LOOKUP_NORMAL | LOOKUP_NONVIRTUAL, tf_warning_or_error); finish_decl_cleanup (NULL_TREE, expr); } for (member = TYPE_FIELDS (current_class_type); member; member = TREE_CHAIN (member)) { if (TREE_TYPE (member) == error_mark_node || TREE_CODE (member) != FIELD_DECL || DECL_ARTIFICIAL (member)) continue; if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (member))) { tree this_member = (build_class_member_access_expr (current_class_ref, member, /*access_path=*/NULL_TREE, /*preserve_reference=*/false, tf_warning_or_error)); tree this_type = TREE_TYPE (member); expr = build_delete (this_type, this_member, sfk_complete_destructor, LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR|LOOKUP_NORMAL, 0); finish_decl_cleanup (NULL_TREE, expr); } } } /* Build a C++ vector delete expression. MAXINDEX is the number of elements to be deleted. ELT_SIZE is the nominal size of each element in the vector. BASE is the expression that should yield the store to be deleted. This function expands (or synthesizes) these calls itself. AUTO_DELETE_VEC says whether the container (vector) should be deallocated. This also calls delete for virtual baseclasses of elements of the vector. Update: MAXINDEX is no longer needed. The size can be extracted from the start of the vector for pointers, and from the type for arrays. We still use MAXINDEX for arrays because it happens to already have one of the values we'd have to extract. (We could use MAXINDEX with pointers to confirm the size, and trap if the numbers differ; not clear that it'd be worth bothering.) */ tree build_vec_delete (tree base, tree maxindex, special_function_kind auto_delete_vec, int use_global_delete) { tree type; tree rval; tree base_init = NULL_TREE; type = TREE_TYPE (base); if (TREE_CODE (type) == POINTER_TYPE) { /* Step back one from start of vector, and read dimension. */ tree cookie_addr; tree size_ptr_type = build_pointer_type (sizetype); if (TREE_SIDE_EFFECTS (base)) { base_init = get_target_expr (base); base = TARGET_EXPR_SLOT (base_init); } type = strip_array_types (TREE_TYPE (type)); cookie_addr = fold_build1_loc (input_location, NEGATE_EXPR, sizetype, TYPE_SIZE_UNIT (sizetype)); cookie_addr = build2 (POINTER_PLUS_EXPR, size_ptr_type, fold_convert (size_ptr_type, base), cookie_addr); maxindex = cp_build_indirect_ref (cookie_addr, RO_NULL, tf_warning_or_error); } else if (TREE_CODE (type) == ARRAY_TYPE) { /* Get the total number of things in the array, maxindex is a bad name. */ maxindex = array_type_nelts_total (type); type = strip_array_types (type); base = cp_build_unary_op (ADDR_EXPR, base, 1, tf_warning_or_error); if (TREE_SIDE_EFFECTS (base)) { base_init = get_target_expr (base); base = TARGET_EXPR_SLOT (base_init); } } else { if (base != error_mark_node) error ("type to vector delete is neither pointer or array type"); return error_mark_node; } rval = build_vec_delete_1 (base, maxindex, type, auto_delete_vec, use_global_delete); if (base_init) rval = build2 (COMPOUND_EXPR, TREE_TYPE (rval), base_init, rval); return rval; }
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