/* RunTime Type Identification
- Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000
+ Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
Free Software Foundation, Inc.
Mostly written by Jason Merrill (jason@cygnus.com).
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC is free software; you can redistribute it and/or modify
+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 2, or (at your option)
any later version.
-GNU CC is distributed in the hope that it will be useful,
+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 GNU CC; see the file COPYING. If not, write to
+along with GCC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "tree.h"
#include "cp-tree.h"
#include "flags.h"
#include "output.h"
#include "assert.h"
#include "toplev.h"
-#include "defaults.h"
+#include "convert.h"
+
+/* C++ returns type information to the user in struct type_info
+ objects. We also use type information to implement dynamic_cast and
+ exception handlers. Type information for a particular type is
+ indicated with an ABI defined structure derived from type_info.
+ This would all be very straight forward, but for the fact that the
+ runtime library provides the definitions of the type_info structure
+ and the ABI defined derived classes. We cannot build declarations
+ of them directly in the compiler, but we need to layout objects of
+ their type. Somewhere we have to lie.
+
+ We define layout compatible POD-structs with compiler-defined names
+ and generate the appropriate initializations for them (complete
+ with explicit mention of their vtable). When we have to provide a
+ type_info to the user we reinterpret_cast the internal compiler
+ type to type_info. A well formed program can only explicitly refer
+ to the type_infos of complete types (& cv void). However, we chain
+ pointer type_infos to the pointed-to-type, and that can be
+ incomplete. We only need the addresses of such incomplete
+ type_info objects for static initialization.
+
+ The type information VAR_DECL of a type is held on the
+ IDENTIFIER_GLOBAL_VALUE of the type's mangled name. That VAR_DECL
+ will be the internal type. It will usually have the correct
+ internal type reflecting the kind of type it represents (pointer,
+ array, function, class, inherited class, etc). When the type it
+ represents is incomplete, it will have the internal type
+ corresponding to type_info. That will only happen at the end of
+ translation, when we are emitting the type info objects. */
/* Accessors for the type_info objects. We need to remember several things
about each of the type_info types. The global tree nodes such as
bltn_desc_type_node are TREE_LISTs, and these macros are used to access
- the required information. */
-/* The RECORD_TYPE of a type_info derived class. */
+ the required information. */
+/* The RECORD_TYPE of a type_info derived class. */
#define TINFO_PSEUDO_TYPE(NODE) TREE_TYPE (NODE)
-/* The VAR_DECL of the vtable for the type_info derived class. */
+/* The VAR_DECL of the vtable for the type_info derived class.
+ This is only filled in at the end of the translation. */
#define TINFO_VTABLE_DECL(NODE) TREE_VALUE (NODE)
-
-extern struct obstack permanent_obstack;
-
-static tree build_headof_sub PARAMS((tree));
-static tree build_headof PARAMS((tree));
-static tree get_tinfo_var PARAMS((tree));
-static tree ifnonnull PARAMS((tree, tree));
-static tree tinfo_name PARAMS((tree));
-static tree get_base_offset PARAMS((tree, tree));
-static tree build_dynamic_cast_1 PARAMS((tree, tree));
-static void expand_si_desc PARAMS((tree, tree));
-static void expand_class_desc PARAMS((tree, tree));
-static void expand_attr_desc PARAMS((tree, tree));
-static void expand_ptr_desc PARAMS((tree, tree));
-static void expand_generic_desc PARAMS((tree, tree, const char *));
-static tree throw_bad_cast PARAMS((void));
-static tree throw_bad_typeid PARAMS((void));
-static tree get_tinfo_decl_dynamic PARAMS((tree));
-static tree tinfo_from_decl PARAMS((tree));
-static int qualifier_flags PARAMS((tree));
-static int target_incomplete_p PARAMS((tree));
-static tree tinfo_base_init PARAMS((tree, tree));
-static tree generic_initializer PARAMS((tree, tree));
-static tree ptr_initializer PARAMS((tree, tree, int *));
-static tree ptm_initializer PARAMS((tree, tree, int *));
-static tree dfs_class_hint_mark PARAMS ((tree, void *));
-static tree dfs_class_hint_unmark PARAMS ((tree, void *));
-static int class_hint_flags PARAMS((tree));
-static tree class_initializer PARAMS((tree, tree, tree));
-static tree synthesize_tinfo_var PARAMS((tree, tree));
-static tree create_real_tinfo_var PARAMS((tree, tree, tree, int));
-static tree create_pseudo_type_info PARAMS((const char *, int, ...));
-static tree get_vmi_pseudo_type_info PARAMS((int));
-static void create_tinfo_types PARAMS((void));
+/* The IDENTIFIER_NODE naming the real class. */
+#define TINFO_REAL_NAME(NODE) TREE_PURPOSE (NODE)
+
+/* A vector of all tinfo decls that haven't yet been emitted. */
+VEC (tree) *unemitted_tinfo_decls;
+
+static tree build_headof (tree);
+static tree ifnonnull (tree, tree);
+static tree tinfo_name (tree);
+static tree build_dynamic_cast_1 (tree, tree);
+static tree throw_bad_cast (void);
+static tree throw_bad_typeid (void);
+static tree get_tinfo_decl_dynamic (tree);
+static tree get_tinfo_ptr (tree);
+static bool typeid_ok_p (void);
+static int qualifier_flags (tree);
+static bool target_incomplete_p (tree);
+static tree tinfo_base_init (tree, tree);
+static tree generic_initializer (tree, tree);
+static tree class_initializer (tree, tree, tree);
+static tree create_pseudo_type_info (const char *, int, ...);
+static tree get_pseudo_ti_init (tree, tree);
+static tree get_pseudo_ti_desc (tree);
+static void create_tinfo_types (void);
+static bool typeinfo_in_lib_p (tree);
static int doing_runtime = 0;
\f
-void
-init_rtti_processing ()
-{
- if (flag_honor_std)
- push_namespace (std_identifier);
- type_info_type_node = xref_tag
- (class_type_node, get_identifier ("type_info"), 1);
- if (flag_honor_std)
- pop_namespace ();
- if (!new_abi_rtti_p ())
- {
- tinfo_decl_id = get_identifier ("__tf");
- tinfo_decl_type = build_function_type
- (build_reference_type
- (build_qualified_type
- (type_info_type_node, TYPE_QUAL_CONST)),
- void_list_node);
- tinfo_var_id = get_identifier ("__ti");
- }
- else
- {
- /* FIXME: These identifier prefixes are not set in stone yet. */
- tinfo_decl_id = get_identifier ("__ti");
- tinfo_var_id = get_identifier ("__tn");
- tinfo_decl_type = build_qualified_type
- (type_info_type_node, TYPE_QUAL_CONST);
- }
-}
-/* Given a pointer to an object with at least one virtual table
- pointer somewhere, return a pointer to a possible sub-object that
- has a virtual table pointer in it that is the vtable parent for
- that sub-object. */
+/* Declare language defined type_info type and a pointer to const
+ type_info. This is incomplete here, and will be completed when
+ the user #includes <typeinfo>. There are language defined
+ restrictions on what can be done until that is included. Create
+ the internal versions of the ABI types. */
-static tree
-build_headof_sub (exp)
- tree exp;
+void
+init_rtti_processing (void)
{
- tree type = TREE_TYPE (TREE_TYPE (exp));
- tree basetype = CLASSTYPE_RTTI (type);
- tree binfo = get_binfo (basetype, type, 0);
-
- exp = convert_pointer_to_real (binfo, exp);
- return exp;
+ tree const_type_info_type;
+
+ push_namespace (std_identifier);
+ type_info_type_node
+ = xref_tag (class_type, get_identifier ("type_info"),
+ true, false);
+ pop_namespace ();
+ const_type_info_type = build_qualified_type (type_info_type_node,
+ TYPE_QUAL_CONST);
+ type_info_ptr_type = build_pointer_type (const_type_info_type);
+ type_info_ref_type = build_reference_type (const_type_info_type);
+
+ unemitted_tinfo_decls = VEC_alloc (tree, 124);
+
+ create_tinfo_types ();
}
/* Given the expression EXP of type `class *', return the head of the
expression. */
static tree
-build_headof (exp)
- tree exp;
+build_headof (tree exp)
{
tree type = TREE_TYPE (exp);
- tree aref;
tree offset;
tree index;
- my_friendly_assert (TREE_CODE (type) == POINTER_TYPE, 20000112);
+ gcc_assert (TREE_CODE (type) == POINTER_TYPE);
type = TREE_TYPE (type);
if (!TYPE_POLYMORPHIC_P (type))
return exp;
- if (CLASSTYPE_COM_INTERFACE (type))
- {
- cp_error ("RTTI not supported for COM interface type `%T'", type);
- return error_mark_node;
- }
-
- /* If we don't have rtti stuff, get to a sub-object that does. */
- if (!CLASSTYPE_VFIELDS (TREE_TYPE (TREE_TYPE (exp))))
- exp = build_headof_sub (exp);
/* We use this a couple of times below, protect it. */
exp = save_expr (exp);
- /* Under the new ABI, the offset-to-top field is at index -2 from
- the vptr. */
- if (new_abi_rtti_p ())
- index = build_int_2 (-2, -1);
- /* But under the old ABI, it is at offset zero. */
- else
- index = integer_zero_node;
+ /* The offset-to-top field is at index -2 from the vptr. */
+ index = build_int_cst (NULL_TREE,
+ -2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
- aref = build_vtbl_ref (build_indirect_ref (exp, NULL_PTR), index);
-
- if (flag_vtable_thunks)
- offset = aref;
- else
- offset = build_component_ref (aref, delta_identifier, NULL_TREE, 0);
+ offset = build_vtbl_ref (build_indirect_ref (exp, NULL), index);
type = build_qualified_type (ptr_type_node,
- CP_TYPE_QUALS (TREE_TYPE (exp)));
- return build (PLUS_EXPR, type, exp,
- cp_convert (ptrdiff_type_node, offset));
+ cp_type_quals (TREE_TYPE (exp)));
+ return build2 (PLUS_EXPR, type, exp,
+ convert_to_integer (ptrdiff_type_node, offset));
}
/* Get a bad_cast node for the program to throw...
See libstdc++/exception.cc for __throw_bad_cast */
static tree
-throw_bad_cast ()
+throw_bad_cast (void)
{
- tree fn = get_identifier ("__throw_bad_cast");
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
+ tree fn = get_identifier ("__cxa_bad_cast");
+ if (!get_global_value_if_present (fn, &fn))
fn = push_throw_library_fn (fn, build_function_type (ptr_type_node,
void_list_node));
- return build_call (fn, NULL_TREE);
+ return build_cxx_call (fn, NULL_TREE);
}
+/* Return an expression for "__cxa_bad_typeid()". The expression
+ returned is an lvalue of type "const std::type_info". */
+
static tree
-throw_bad_typeid ()
+throw_bad_typeid (void)
{
- tree fn = get_identifier ("__throw_bad_typeid");
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
+ tree fn = get_identifier ("__cxa_bad_typeid");
+ if (!get_global_value_if_present (fn, &fn))
{
tree t = build_qualified_type (type_info_type_node, TYPE_QUAL_CONST);
t = build_function_type (build_reference_type (t), void_list_node);
fn = push_throw_library_fn (fn, t);
}
- return build_call (fn, NULL_TREE);
+ return convert_from_reference (build_cxx_call (fn, NULL_TREE));
}
\f
-/* Return a pointer to type_info function associated with the expression EXP.
- If EXP is a reference to a polymorphic class, return the dynamic type;
+/* Return an lvalue expression whose type is "const std::type_info"
+ and whose value indicates the type of the expression EXP. If EXP
+ is a reference to a polymorphic class, return the dynamic type;
otherwise return the static type of the expression. */
static tree
-get_tinfo_decl_dynamic (exp)
- tree exp;
+get_tinfo_decl_dynamic (tree exp)
{
tree type;
+ tree t;
if (exp == error_mark_node)
return error_mark_node;
- type = TREE_TYPE (exp);
-
/* peel back references, so they match. */
- if (TREE_CODE (type) == REFERENCE_TYPE)
- type = TREE_TYPE (type);
+ type = non_reference (TREE_TYPE (exp));
/* Peel off cv qualifiers. */
type = TYPE_MAIN_VARIANT (type);
if (TYPE_POLYMORPHIC_P (type) && ! resolves_to_fixed_type_p (exp, 0))
{
/* build reference to type_info from vtable. */
- tree t;
tree index;
- if (! flag_rtti)
- error ("taking dynamic typeid of object with -fno-rtti");
- if (CLASSTYPE_COM_INTERFACE (type))
- {
- cp_error ("RTTI not supported for COM interface type `%T'", type);
- return error_mark_node;
- }
-
- /* If we don't have rtti stuff, get to a sub-object that does. */
- if (! CLASSTYPE_VFIELDS (type))
- {
- exp = build_unary_op (ADDR_EXPR, exp, 0);
- exp = build_headof_sub (exp);
- exp = build_indirect_ref (exp, NULL_PTR);
- }
-
- /* The RTTI information is always in the vtable, but it's at
- different indices depending on the ABI. */
- if (new_abi_rtti_p ())
- index = minus_one_node;
- else if (flag_vtable_thunks)
- index = integer_one_node;
- else
- index = integer_zero_node;
- t = build_vfn_ref ((tree *) 0, exp, index);
- TREE_TYPE (t) = build_pointer_type (tinfo_decl_type);
- return t;
+ /* The RTTI information is at index -1. */
+ index = build_int_cst (NULL_TREE,
+ -1 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
+ t = build_vtbl_ref (exp, index);
+ t = convert (type_info_ptr_type, t);
}
+ else
+ /* Otherwise return the type_info for the static type of the expr. */
+ t = get_tinfo_ptr (TYPE_MAIN_VARIANT (type));
- /* otherwise return the type_info for the static type of the expr. */
- exp = get_tinfo_decl (TYPE_MAIN_VARIANT (type));
- return build_unary_op (ADDR_EXPR, exp, 0);
+ return build_indirect_ref (t, NULL);
}
-tree
-build_typeid (exp)
- tree exp;
+static bool
+typeid_ok_p (void)
{
- tree cond = NULL_TREE;
- int nonnull = 0;
-
if (! flag_rtti)
{
error ("cannot use typeid with -fno-rtti");
- return error_mark_node;
+ return false;
}
if (!COMPLETE_TYPE_P (type_info_type_node))
{
error ("must #include <typeinfo> before using typeid");
- return error_mark_node;
+ return false;
}
+ return true;
+}
+
+/* Return an expression for "typeid(EXP)". The expression returned is
+ an lvalue of type "const std::type_info". */
+
+tree
+build_typeid (tree exp)
+{
+ tree cond = NULL_TREE;
+ int nonnull = 0;
+
+ if (exp == error_mark_node || !typeid_ok_p ())
+ return error_mark_node;
+
if (processing_template_decl)
- return build_min_nt (TYPEID_EXPR, exp);
+ return build_min (TYPEID_EXPR, type_info_ref_type, exp);
if (TREE_CODE (exp) == INDIRECT_REF
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
if (exp == error_mark_node)
return error_mark_node;
- exp = tinfo_from_decl (exp);
-
if (cond)
{
tree bad = throw_bad_typeid ();
- exp = build (COND_EXPR, TREE_TYPE (exp), cond, exp, bad);
+ exp = build3 (COND_EXPR, TREE_TYPE (exp), cond, exp, bad);
}
- return convert_from_reference (exp);
-}
-
-static tree
-get_tinfo_var (type)
- tree type;
-{
- tree tname = build_overload_with_type (tinfo_var_id, type);
- tree arrtype;
- int size;
-
- my_friendly_assert (!new_abi_rtti_p (), 20000118);
- if (IDENTIFIER_GLOBAL_VALUE (tname))
- return IDENTIFIER_GLOBAL_VALUE (tname);
-
- /* Figure out how much space we need to allocate for the type_info object.
- If our struct layout or the type_info classes are changed, this will
- need to be modified. */
- if (TYPE_QUALS (type) != TYPE_UNQUALIFIED)
- size = 3 * POINTER_SIZE + INT_TYPE_SIZE;
- else if (TREE_CODE (type) == POINTER_TYPE
- && ! (TREE_CODE (TREE_TYPE (type)) == OFFSET_TYPE
- || TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE))
- size = 3 * POINTER_SIZE;
- else if (IS_AGGR_TYPE (type))
- {
- if (CLASSTYPE_N_BASECLASSES (type) == 0)
- size = 2 * POINTER_SIZE;
- else if (! TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (type)
- && (TREE_VIA_PUBLIC
- (TREE_VEC_ELT (TYPE_BINFO_BASETYPES (type), 0))))
- size = 3 * POINTER_SIZE;
- else
- size = 3 * POINTER_SIZE + TYPE_PRECISION (sizetype);
- }
- else
- size = 2 * POINTER_SIZE;
-
- /* The type for a character array of the appropriate size. */
- arrtype = build_cplus_array_type
- (unsigned_char_type_node,
- build_index_type (size_int (size / BITS_PER_UNIT - 1)));
-
- return declare_global_var (tname, arrtype);
+ return exp;
}
/* Generate the NTBS name of a type. */
static tree
-tinfo_name (type)
- tree type;
+tinfo_name (tree type)
{
const char *name;
tree name_string;
- if (flag_new_abi)
- name = mangle_type_string (type);
- else
- name = build_overload_name (type, 1, 1);
- name_string = combine_strings (build_string (strlen (name) + 1, name));
+ name = mangle_type_string (type);
+ name_string = fix_string_type (build_string (strlen (name) + 1, name));
return name_string;
}
-/* Returns a decl for a function or variable which can be used to obtain a
- type_info object for TYPE. The old-abi uses functions, the new-abi
- uses the type_info object directly. You can take the address of the
- returned decl, to save the decl. To use the decl call
- tinfo_from_decl. You must arrange that the decl is mark_used, if
- actually use it --- decls in vtables are only used if the vtable is
- output. */
+/* Return a VAR_DECL for the internal ABI defined type_info object for
+ TYPE. You must arrange that the decl is mark_used, if actually use
+ it --- decls in vtables are only used if the vtable is output. */
tree
-get_tinfo_decl (type)
- tree type;
+get_tinfo_decl (tree type)
{
tree name;
tree d;
- if (TREE_CODE (type) == OFFSET_TYPE)
- type = TREE_TYPE (type);
+ if (COMPLETE_TYPE_P (type)
+ && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
+ {
+ error ("cannot create type information for type %qT because "
+ "its size is variable",
+ type);
+ return error_mark_node;
+ }
+
if (TREE_CODE (type) == METHOD_TYPE)
type = build_function_type (TREE_TYPE (type),
TREE_CHAIN (TYPE_ARG_TYPES (type)));
- if (flag_new_abi)
- name = mangle_typeinfo_for_type (type);
- else
- name = build_overload_with_type (tinfo_decl_id, type);
+ /* For a class type, the variable is cached in the type node
+ itself. */
+ if (CLASS_TYPE_P (type))
+ {
+ d = CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type));
+ if (d)
+ return d;
+ }
+
+ name = mangle_typeinfo_for_type (type);
d = IDENTIFIER_GLOBAL_VALUE (name);
- if (d)
- /* OK */;
- else if (!new_abi_rtti_p ())
+ if (!d)
{
- /* The tinfo decl is a function returning a reference to the
- type_info object. */
- d = push_library_fn (name, tinfo_decl_type);
- DECL_NOT_REALLY_EXTERN (d) = 1;
- SET_DECL_TINFO_FN_P (d);
+ tree var_desc = get_pseudo_ti_desc (type);
+
+ d = build_lang_decl (VAR_DECL, name, TINFO_PSEUDO_TYPE (var_desc));
+ SET_DECL_ASSEMBLER_NAME (d, name);
+ /* Remember the type it is for. */
TREE_TYPE (name) = type;
- defer_fn (d);
- }
- else
- {
- /* The tinfo decl is the type_info object itself. We make all
- tinfo objects look as type_info, even though they will end up
- being a subclass of that when emitted. This means the we'll
- erroneously think we know the dynamic type -- be careful in the
- runtime. */
- d = build_lang_decl (VAR_DECL, name, tinfo_decl_type);
-
+ DECL_TINFO_P (d) = 1;
DECL_ARTIFICIAL (d) = 1;
- DECL_ALIGN (d) = TYPE_ALIGN (ptr_type_node);
- DECL_USER_ALIGN (d) = 0;
TREE_READONLY (d) = 1;
TREE_STATIC (d) = 1;
+ /* Mark the variable as undefined -- but remember that we can
+ define it later if we need to do so. */
DECL_EXTERNAL (d) = 1;
- TREE_PUBLIC (d) = 1;
- comdat_linkage (d);
- DECL_ASSEMBLER_NAME (d) = DECL_NAME (d);
- cp_finish_decl (d, NULL_TREE, NULL_TREE, 0);
+ DECL_NOT_REALLY_EXTERN (d) = 1;
+ if (CLASS_TYPE_P (type))
+ CLASSTYPE_TYPEINFO_VAR (TYPE_MAIN_VARIANT (type)) = d;
+ set_linkage_according_to_type (type, d);
+ pushdecl_top_level_and_finish (d, NULL_TREE);
- pushdecl_top_level (d);
- /* Remember the type it is for. */
- TREE_TYPE (name) = type;
- TREE_USED (name) = 1;
+ /* Add decl to the global array of tinfo decls. */
+ VEC_safe_push (tree, unemitted_tinfo_decls, d);
}
+
return d;
}
-/* Given an expr produced by get_tinfo_decl, return an expr which
- produces a reference to the type_info object. */
+/* Return a pointer to a type_info object describing TYPE, suitably
+ cast to the language defined type. */
static tree
-tinfo_from_decl (expr)
- tree expr;
-{
- tree t;
-
- if (!new_abi_rtti_p ())
- t = build_call (expr, NULL_TREE);
- else if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE)
- t = build_indirect_ref (expr, NULL);
- else
- t = expr;
-
- return t;
-}
-
-tree
-get_typeid_1 (type)
- tree type;
+get_tinfo_ptr (tree type)
{
- tree t;
+ tree decl = get_tinfo_decl (type);
- t = get_tinfo_decl (type);
- t = tinfo_from_decl (t);
- return convert_from_reference (t);
+ mark_used (decl);
+ return build_nop (type_info_ptr_type,
+ build_address (decl));
}
-
+
/* Return the type_info object for TYPE. */
tree
-get_typeid (type)
- tree type;
+get_typeid (tree type)
{
- if (type == error_mark_node)
+ if (type == error_mark_node || !typeid_ok_p ())
return error_mark_node;
-
- if (!COMPLETE_TYPE_P (type_info_type_node))
- {
- error ("must #include <typeinfo> before using typeid");
- return error_mark_node;
- }
if (processing_template_decl)
- return build_min_nt (TYPEID_EXPR, type);
+ return build_min (TYPEID_EXPR, type_info_ref_type, type);
/* If the type of the type-id is a reference type, the result of the
typeid expression refers to a type_info object representing the
referenced type. */
- if (TREE_CODE (type) == REFERENCE_TYPE)
- type = TREE_TYPE (type);
+ type = non_reference (type);
/* The top-level cv-qualifiers of the lvalue expression or the type-id
that is the operand of typeid are always ignored. */
if (!type)
return error_mark_node;
- return get_typeid_1 (type);
+ return build_indirect_ref (get_tinfo_ptr (type), NULL);
}
/* Check whether TEST is null before returning RESULT. If TEST is used in
RESULT, it must have previously had a save_expr applied to it. */
static tree
-ifnonnull (test, result)
- tree test, result;
-{
- return build (COND_EXPR, TREE_TYPE (result),
- build (EQ_EXPR, boolean_type_node, test, integer_zero_node),
- cp_convert (TREE_TYPE (result), integer_zero_node),
- result);
-}
-
-/* Generate the constant expression describing where direct base BINFO
- appears within the PARENT. How to interpret this expression depends on
- details of the ABI, which the runtime must be aware of. */
-
-static tree
-get_base_offset (binfo, parent)
- tree binfo;
- tree parent;
+ifnonnull (tree test, tree result)
{
- if (! TREE_VIA_VIRTUAL (binfo))
- return BINFO_OFFSET (binfo);
- else if (! vbase_offsets_in_vtable_p ())
- {
- const char *name;
- tree result;
- tree field;
-
- FORMAT_VBASE_NAME (name, BINFO_TYPE (binfo));
- field = lookup_field (parent, get_identifier (name), 0, 0);
- result = byte_position (field);
-
- if (DECL_CONTEXT (field) != parent)
- {
- /* The vbase pointer might be in a non-virtual base of PARENT.
- * Adjust for the offset of that base in PARENT. */
- tree path;
-
- get_base_distance (DECL_CONTEXT (field), parent, -1, &path);
- result = build (PLUS_EXPR, TREE_TYPE (result),
- result, BINFO_OFFSET (path));
- result = fold (result);
- }
- return result;
- }
- else
- /* Under the new ABI, we store the vtable offset at which
- the virtual base offset can be found. */
- return convert (sizetype,
- BINFO_VPTR_FIELD (binfo_for_vbase (BINFO_TYPE (binfo),
- parent)));
-
+ return build3 (COND_EXPR, TREE_TYPE (result),
+ build2 (EQ_EXPR, boolean_type_node, test, integer_zero_node),
+ cp_convert (TREE_TYPE (result), integer_zero_node),
+ result);
}
/* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working
paper. */
static tree
-build_dynamic_cast_1 (type, expr)
- tree type, expr;
+build_dynamic_cast_1 (tree type, tree expr)
{
enum tree_code tc = TREE_CODE (type);
tree exprtype = TREE_TYPE (expr);
goto fail;
}
- if (TREE_CODE (expr) == OFFSET_REF)
- {
- expr = resolve_offset_ref (expr);
- exprtype = TREE_TYPE (expr);
- }
-
if (tc == POINTER_TYPE)
expr = convert_from_reference (expr);
else if (TREE_CODE (exprtype) != REFERENCE_TYPE)
/* If *type is an unambiguous accessible base class of *exprtype,
convert statically. */
{
- int distance;
- tree path;
+ tree binfo;
- distance = get_base_distance (TREE_TYPE (type), TREE_TYPE (exprtype), 1,
- &path);
-
- if (distance == -2)
- {
- cp_error ("dynamic_cast from `%T' to ambiguous base class `%T'",
- TREE_TYPE (exprtype), TREE_TYPE (type));
- return error_mark_node;
- }
- if (distance == -3)
- {
- cp_error ("dynamic_cast from `%T' to private base class `%T'",
- TREE_TYPE (exprtype), TREE_TYPE (type));
- return error_mark_node;
- }
+ binfo = lookup_base (TREE_TYPE (exprtype), TREE_TYPE (type),
+ ba_not_special, NULL);
- if (distance >= 0)
+ if (binfo)
{
- expr = build_vbase_path (PLUS_EXPR, type, expr, path, 0);
+ expr = build_base_path (PLUS_EXPR, convert_from_reference (expr),
+ binfo, 0);
if (TREE_CODE (exprtype) == POINTER_TYPE)
expr = non_lvalue (expr);
return expr;
&& TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE)
{
tree expr = throw_bad_cast ();
- cp_warning ("dynamic_cast of `%#D' to `%#T' can never succeed",
- old_expr, type);
+ warning ("dynamic_cast of %q#D to %q#T can never succeed",
+ old_expr, type);
/* Bash it to the expected type. */
TREE_TYPE (expr) = type;
return expr;
if (TREE_CODE (op) == VAR_DECL
&& TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE)
{
- cp_warning ("dynamic_cast of `%#D' to `%#T' can never succeed",
- op, type);
- retval = build_int_2 (0, 0);
- TREE_TYPE (retval) = type;
+ warning ("dynamic_cast of %q#D to %q#T can never succeed",
+ op, type);
+ retval = build_int_cst (type, 0);
return retval;
}
}
target_type = TYPE_MAIN_VARIANT (TREE_TYPE (type));
static_type = TYPE_MAIN_VARIANT (TREE_TYPE (exprtype));
- td2 = build_unary_op (ADDR_EXPR, get_tinfo_decl (target_type), 0);
- td3 = build_unary_op (ADDR_EXPR, get_tinfo_decl (static_type), 0);
+ td2 = get_tinfo_decl (target_type);
+ mark_used (td2);
+ td2 = build_unary_op (ADDR_EXPR, td2, 0);
+ td3 = get_tinfo_decl (static_type);
+ mark_used (td3);
+ td3 = build_unary_op (ADDR_EXPR, td3, 0);
/* Determine how T and V are related. */
boff = get_dynamic_cast_base_type (static_type, target_type);
if (tc == REFERENCE_TYPE)
expr1 = build_unary_op (ADDR_EXPR, expr1, 0);
- if (!new_abi_rtti_p ())
- {
- tree expr2 = build_headof (expr1);
- tree td1 = expr;
-
- if (tc == POINTER_TYPE)
- td1 = build_indirect_ref (td1, NULL_PTR);
- td1 = get_tinfo_decl_dynamic (td1);
-
- elems = tree_cons
- (NULL_TREE, td1, tree_cons
- (NULL_TREE, td2, tree_cons
- (NULL_TREE, boff, tree_cons
- (NULL_TREE, expr2, tree_cons
- (NULL_TREE, td3, tree_cons
- (NULL_TREE, expr1, NULL_TREE))))));
- }
- else
- elems = tree_cons
- (NULL_TREE, expr1, tree_cons
- (NULL_TREE, td3, tree_cons
- (NULL_TREE, td2, tree_cons
- (NULL_TREE, boff, NULL_TREE))));
+ elems = tree_cons
+ (NULL_TREE, expr1, tree_cons
+ (NULL_TREE, td3, tree_cons
+ (NULL_TREE, td2, tree_cons
+ (NULL_TREE, boff, NULL_TREE))));
dcast_fn = dynamic_cast_node;
if (!dcast_fn)
{
tree tmp;
tree tinfo_ptr;
- tree ns = new_abi_rtti_p () ? abi_node : global_namespace;
+ tree ns = abi_node;
const char *name;
push_nested_namespace (ns);
- if (!new_abi_rtti_p ())
- {
- tinfo_ptr = build_pointer_type (tinfo_decl_type);
- name = "__dynamic_cast_2";
- tmp = tree_cons
- (NULL_TREE, tinfo_ptr, tree_cons
- (NULL_TREE, tinfo_ptr, tree_cons
- (NULL_TREE, integer_type_node, tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, tinfo_ptr, tree_cons
- (NULL_TREE, ptr_type_node, void_list_node))))));
- }
- else
- {
- tinfo_ptr = xref_tag (class_type_node,
- get_identifier ("__class_type_info"),
- 1);
-
- tinfo_ptr = build_pointer_type
- (build_qualified_type
- (tinfo_ptr, TYPE_QUAL_CONST));
- name = "__dynamic_cast";
- tmp = tree_cons
- (NULL_TREE, const_ptr_type_node, tree_cons
- (NULL_TREE, tinfo_ptr, tree_cons
- (NULL_TREE, tinfo_ptr, tree_cons
- (NULL_TREE, ptrdiff_type_node, void_list_node))));
- }
+ tinfo_ptr = xref_tag (class_type,
+ get_identifier ("__class_type_info"),
+ true, false);
+
+ tinfo_ptr = build_pointer_type
+ (build_qualified_type
+ (tinfo_ptr, TYPE_QUAL_CONST));
+ name = "__dynamic_cast";
+ tmp = tree_cons
+ (NULL_TREE, const_ptr_type_node, tree_cons
+ (NULL_TREE, tinfo_ptr, tree_cons
+ (NULL_TREE, tinfo_ptr, tree_cons
+ (NULL_TREE, ptrdiff_type_node, void_list_node))));
tmp = build_function_type (ptr_type_node, tmp);
dcast_fn = build_library_fn_ptr (name, tmp);
+ DECL_IS_PURE (dcast_fn) = 1;
pop_nested_namespace (ns);
dynamic_cast_node = dcast_fn;
}
- result = build_call (dcast_fn, elems);
+ result = build_cxx_call (dcast_fn, elems);
if (tc == REFERENCE_TYPE)
{
tree bad = throw_bad_cast ();
result = save_expr (result);
- return build (COND_EXPR, type, result, result, bad);
+ return build3 (COND_EXPR, type, result, result, bad);
}
/* Now back to the type we want from a void*. */
errstr = "source type is not polymorphic";
fail:
- cp_error ("cannot dynamic_cast `%E' (of type `%#T') to type `%#T' (%s)",
- expr, exprtype, type, errstr);
+ error ("cannot dynamic_cast %qE (of type %q#T) to type %q#T (%s)",
+ expr, exprtype, type, errstr);
return error_mark_node;
}
tree
-build_dynamic_cast (type, expr)
- tree type, expr;
+build_dynamic_cast (tree type, tree expr)
{
if (type == error_mark_node || expr == error_mark_node)
return error_mark_node;
if (processing_template_decl)
- return build_min (DYNAMIC_CAST_EXPR, type, expr);
-
- return convert_from_reference (build_dynamic_cast_1 (type, expr));
-}
-\f
-/* Build and initialize various sorts of descriptors. Every descriptor
- node has a name associated with it (the name created by mangling).
- For this reason, we use the identifier as our access to the __*_desc
- nodes, instead of sticking them directly in the types. Otherwise we
- would burden all built-in types (and pointer types) with slots that
- we don't necessarily want to use.
-
- For each descriptor we build, we build a variable that contains
- the descriptor's information. When we need this info at runtime,
- all we need is access to these variables.
-
- Note: these constructors always return the address of the descriptor
- info, since that is simplest for their mutual interaction. */
-
-/* Build an initializer for a __si_type_info node. */
-
-static void
-expand_si_desc (tdecl, type)
- tree tdecl;
- tree type;
-{
- tree t, elems, fn;
- tree name_string = tinfo_name (type);
-
- type = BINFO_TYPE (TREE_VEC_ELT (TYPE_BINFO_BASETYPES (type), 0));
- finish_expr_stmt (get_typeid_1 (type));
- t = decay_conversion (get_tinfo_var (type));
- elems = tree_cons
- (NULL_TREE, decay_conversion (tdecl), tree_cons
- (NULL_TREE, decay_conversion (name_string), tree_cons
- (NULL_TREE, t, NULL_TREE)));
-
- fn = get_identifier ("__rtti_si");
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
{
- tree tmp;
- tmp = tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, const_string_type_node, tree_cons
- (NULL_TREE, build_pointer_type (type_info_type_node),
- void_list_node)));
- fn = push_void_library_fn (fn, tmp);
- }
-
- fn = build_call (fn, elems);
- finish_expr_stmt (fn);
-}
-
-/* Build an initializer for a __class_type_info node. */
-
-static void
-expand_class_desc (tdecl, type)
- tree tdecl;
- tree type;
-{
- tree name_string;
- tree fn, tmp;
-
- int i = CLASSTYPE_N_BASECLASSES (type);
- int base_cnt = 0;
- tree binfos = TYPE_BINFO_BASETYPES (type);
- tree base, elems, access, offset, isvir;
- tree elt, elts = NULL_TREE;
-
- if (base_desc_type_node == NULL_TREE)
- {
- tree fields [4];
-
- /* A reasonably close approximation of __class_type_info::base_info */
-
- base_desc_type_node = make_aggr_type (RECORD_TYPE);
-
- /* Actually const __user_type_info * */
- fields [0] = build_decl
- (FIELD_DECL, NULL_TREE,
- build_pointer_type (build_qualified_type
- (type_info_type_node,
- TYPE_QUAL_CONST)));
- fields [1] = build_decl
- (FIELD_DECL, NULL_TREE,
- flag_new_abi ? intSI_type_node : unsigned_intSI_type_node);
- DECL_BIT_FIELD (fields[1]) = 1;
- DECL_SIZE (fields[1]) = bitsize_int (29);
-
- fields [2] = build_decl (FIELD_DECL, NULL_TREE, boolean_type_node);
- DECL_BIT_FIELD (fields[2]) = 1;
- DECL_SIZE (fields[2]) = bitsize_one_node;
-
- /* Actually enum access */
- fields [3] = build_decl (FIELD_DECL, NULL_TREE, integer_type_node);
- DECL_BIT_FIELD (fields[3]) = 1;
- DECL_SIZE (fields[3]) = bitsize_int (2);
-
- finish_builtin_type (base_desc_type_node, "__base_info", fields,
- 3, ptr_type_node);
- }
-
- while (--i >= 0)
- {
- tree binfo = TREE_VEC_ELT (binfos, i);
-
- finish_expr_stmt (get_typeid_1 (BINFO_TYPE (binfo)));
- base = decay_conversion (get_tinfo_var (BINFO_TYPE (binfo)));
- offset = get_base_offset (binfo, type);
+ expr = build_min (DYNAMIC_CAST_EXPR, type, expr);
+ TREE_SIDE_EFFECTS (expr) = 1;
- if (TREE_VIA_PUBLIC (binfo))
- access = access_public_node;
- else if (TREE_VIA_PROTECTED (binfo))
- access = access_protected_node;
- else
- access = access_private_node;
- if (TREE_VIA_VIRTUAL (binfo))
- isvir = boolean_true_node;
- else
- isvir = boolean_false_node;
-
- elt = build
- (CONSTRUCTOR, base_desc_type_node, NULL_TREE, tree_cons
- (NULL_TREE, base, tree_cons
- (NULL_TREE, offset, tree_cons
- (NULL_TREE, isvir, tree_cons
- (NULL_TREE, access, NULL_TREE)))));
- TREE_HAS_CONSTRUCTOR (elt) = TREE_CONSTANT (elt) = TREE_STATIC (elt) = 1;
- elts = tree_cons (NULL_TREE, elt, elts);
- base_cnt++;
- }
-
- name_string = tinfo_name (type);
-
- {
- tree arrtype = build_array_type (base_desc_type_node, NULL_TREE);
- elts = build (CONSTRUCTOR, arrtype, NULL_TREE, elts);
- TREE_HAS_CONSTRUCTOR (elts) = TREE_CONSTANT (elts)
- = TREE_STATIC (elts) = 1;
- complete_array_type (arrtype, elts, 1);
- }
-
- elems = tree_cons
- (NULL_TREE, decay_conversion (tdecl), tree_cons
- (NULL_TREE, decay_conversion (name_string), tree_cons
- (NULL_TREE, decay_conversion (elts), tree_cons
- (NULL_TREE, cp_convert (sizetype, build_int_2 (base_cnt, 0)),
- NULL_TREE))));
-
- fn = get_identifier ("__rtti_class");
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
- {
- tmp = tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, const_string_type_node, tree_cons
- (NULL_TREE, build_pointer_type (base_desc_type_node), tree_cons
- (NULL_TREE, sizetype, void_list_node))));
-
- fn = push_void_library_fn (fn, tmp);
+ return expr;
}
- fn = build_call (fn, elems);
- finish_expr_stmt (fn);
-}
-
-/* Build an initializer for a __pointer_type_info node. */
-
-static void
-expand_ptr_desc (tdecl, type)
- tree tdecl;
- tree type;
-{
- tree t, elems, fn;
- tree name_string = tinfo_name (type);
-
- type = TREE_TYPE (type);
- finish_expr_stmt (get_typeid_1 (type));
- t = decay_conversion (get_tinfo_var (type));
- elems = tree_cons
- (NULL_TREE, decay_conversion (tdecl), tree_cons
- (NULL_TREE, decay_conversion (name_string), tree_cons
- (NULL_TREE, t, NULL_TREE)));
-
- fn = get_identifier ("__rtti_ptr");
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
- {
- tree tmp;
- tmp = tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, const_string_type_node, tree_cons
- (NULL_TREE, build_pointer_type (type_info_type_node),
- void_list_node)));
- fn = push_void_library_fn (fn, tmp);
- }
-
- fn = build_call (fn, elems);
- finish_expr_stmt (fn);
-}
-
-/* Build an initializer for a __attr_type_info node. */
-
-static void
-expand_attr_desc (tdecl, type)
- tree tdecl;
- tree type;
-{
- tree elems, t, fn;
- tree name_string = tinfo_name (type);
- tree attrval = build_int_2 (TYPE_QUALS (type), 0);
-
- finish_expr_stmt (get_typeid_1 (TYPE_MAIN_VARIANT (type)));
- t = decay_conversion (get_tinfo_var (TYPE_MAIN_VARIANT (type)));
- elems = tree_cons
- (NULL_TREE, decay_conversion (tdecl), tree_cons
- (NULL_TREE, decay_conversion (name_string), tree_cons
- (NULL_TREE, attrval, tree_cons (NULL_TREE, t, NULL_TREE))));
-
- fn = get_identifier ("__rtti_attr");
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
- {
- tree tmp;
- tmp = tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, const_string_type_node, tree_cons
- (NULL_TREE, integer_type_node, tree_cons
- (NULL_TREE, build_pointer_type (type_info_type_node),
- void_list_node))));
- fn = push_void_library_fn (fn, tmp);
- }
-
- fn = build_call (fn, elems);
- finish_expr_stmt (fn);
-}
-
-/* Build an initializer for a type_info node that just has a name. */
-
-static void
-expand_generic_desc (tdecl, type, fnname)
- tree tdecl;
- tree type;
- const char *fnname;
-{
- tree name_string = tinfo_name (type);
- tree elems = tree_cons
- (NULL_TREE, decay_conversion (tdecl), tree_cons
- (NULL_TREE, decay_conversion (name_string), NULL_TREE));
-
- tree fn = get_identifier (fnname);
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
- {
- tree tmp;
- tmp = tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, const_string_type_node, void_list_node));
- fn = push_void_library_fn (fn, tmp);
- }
-
- fn = build_call (fn, elems);
- finish_expr_stmt (fn);
-}
-
-/* Generate the code for a type_info initialization function.
- Note that we take advantage of the passage
-
- 5.2.7 Type identification [expr.typeid]
-
- Whether or not the destructor is called for the type_info object at the
- end of the program is unspecified.
-
- and don't bother to arrange for these objects to be destroyed. It
- doesn't matter, anyway, since the destructors don't do anything.
-
- This must only be called from toplevel (i.e. from finish_file)! */
-
-void
-synthesize_tinfo_fn (fndecl)
- tree fndecl;
-{
- tree type = TREE_TYPE (DECL_NAME (fndecl));
- tree tmp, addr, tdecl;
- tree compound_stmt;
- tree if_stmt;
- tree then_clause;
-
- my_friendly_assert (!new_abi_rtti_p (), 20000118);
- if (at_eof)
- {
- import_export_decl (fndecl);
- if (DECL_REALLY_EXTERN (fndecl))
- return;
- }
-
- /* Declare the static typeinfo variable. */
- tdecl = get_tinfo_var (type);
- DECL_EXTERNAL (tdecl) = 0;
- TREE_STATIC (tdecl) = 1;
- DECL_COMMON (tdecl) = 1;
- TREE_USED (tdecl) = 1;
- DECL_ALIGN (tdecl) = TYPE_ALIGN (ptr_type_node);
- DECL_USER_ALIGN (tdecl) = 0;
- cp_finish_decl (tdecl, NULL_TREE, NULL_TREE, 0);
-
- /* Begin processing the function. */
- start_function (NULL_TREE, fndecl, NULL_TREE,
- SF_DEFAULT | SF_PRE_PARSED);
- DECL_DEFER_OUTPUT (fndecl) = 1;
- clear_last_expr ();
-
- /* Begin the body of the function. */
- compound_stmt = begin_compound_stmt (/*has_no_scope=*/0);
-
- /* For convenience, we save away the address of the static
- variable. */
- addr = decay_conversion (tdecl);
-
- /* If the first word of the array (the vtable) is non-zero, we've already
- initialized the object, so don't do it again. */
- if_stmt = begin_if_stmt ();
- tmp = cp_convert (build_pointer_type (ptr_type_node), addr);
- tmp = build_indirect_ref (tmp, 0);
- tmp = cp_build_binary_op (EQ_EXPR, tmp, integer_zero_node);
- finish_if_stmt_cond (tmp, if_stmt);
- then_clause = begin_compound_stmt (/*has_no_scope=*/0);
-
- if (TREE_CODE (type) == FUNCTION_TYPE)
- expand_generic_desc (tdecl, type, "__rtti_func");
- else if (TREE_CODE (type) == ARRAY_TYPE)
- expand_generic_desc (tdecl, type, "__rtti_array");
- else if (TYPE_QUALS (type) != TYPE_UNQUALIFIED)
- expand_attr_desc (tdecl, type);
- else if (TREE_CODE (type) == POINTER_TYPE)
- {
- if (TREE_CODE (TREE_TYPE (type)) == OFFSET_TYPE)
- expand_generic_desc (tdecl, type, "__rtti_ptmd");
- else if (TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE)
- expand_generic_desc (tdecl, type, "__rtti_ptmf");
- else
- expand_ptr_desc (tdecl, type);
- }
- else if (TYPE_PTRMEMFUNC_P (type))
- expand_generic_desc (tdecl, type, "__rtti_ptmf");
- else if (IS_AGGR_TYPE (type))
- {
- if (CLASSTYPE_N_BASECLASSES (type) == 0)
- expand_generic_desc (tdecl, type, "__rtti_user");
- else if (! TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (type)
- && (TREE_VIA_PUBLIC
- (TREE_VEC_ELT (TYPE_BINFO_BASETYPES (type), 0))))
- expand_si_desc (tdecl, type);
- else
- expand_class_desc (tdecl, type);
- }
- else if (TREE_CODE (type) == ENUMERAL_TYPE)
- expand_generic_desc (tdecl, type, "__rtti_user");
- else
- my_friendly_abort (252);
-
- finish_compound_stmt (/*has_no_scope=*/0, then_clause);
- finish_then_clause (if_stmt);
- finish_if_stmt ();
-
- /* OK, now return the type_info object. */
- tmp = cp_convert (build_pointer_type (type_info_type_node), addr);
- tmp = build_indirect_ref (tmp, 0);
- finish_return_stmt (tmp);
- /* Finish the function body. */
- finish_compound_stmt (/*has_no_scope=*/0, compound_stmt);
- expand_body (finish_function (0));
+ return convert_from_reference (build_dynamic_cast_1 (type, expr));
}
-
+\f
/* Return the runtime bit mask encoding the qualifiers of TYPE. */
static int
-qualifier_flags (type)
- tree type;
+qualifier_flags (tree type)
{
int flags = 0;
- /* we want the qualifiers on this type, not any array core, it might have */
- int quals = TYPE_QUALS (type);
+ int quals = cp_type_quals (type);
if (quals & TYPE_QUAL_CONST)
flags |= 1;
return flags;
}
-/* Return non-zero, if the pointer chain TYPE ends at an incomplete type, or
+/* Return true, if the pointer chain TYPE ends at an incomplete type, or
contains a pointer to member of an incomplete class. */
-static int
-target_incomplete_p (type)
- tree type;
+static bool
+target_incomplete_p (tree type)
{
- while (TREE_CODE (type) == POINTER_TYPE)
+ while (true)
if (TYPE_PTRMEM_P (type))
{
- if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type)))
- return 1;
- type = TYPE_PTRMEM_POINTED_TO_TYPE (type);
+ if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type)))
+ return true;
+ type = TYPE_PTRMEM_POINTED_TO_TYPE (type);
}
- else
+ else if (TREE_CODE (type) == POINTER_TYPE)
type = TREE_TYPE (type);
- if (!COMPLETE_OR_VOID_TYPE_P (type))
- return 1;
-
- return 0;
+ else
+ return !COMPLETE_OR_VOID_TYPE_P (type);
+}
+
+/* Returns true if TYPE involves an incomplete class type; in that
+ case, typeinfo variables for TYPE should be emitted with internal
+ linkage. */
+
+static bool
+involves_incomplete_p (tree type)
+{
+ switch (TREE_CODE (type))
+ {
+ case POINTER_TYPE:
+ return target_incomplete_p (TREE_TYPE (type));
+
+ case OFFSET_TYPE:
+ ptrmem:
+ return
+ (target_incomplete_p (TYPE_PTRMEM_POINTED_TO_TYPE (type))
+ || !COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type)));
+
+ case RECORD_TYPE:
+ if (TYPE_PTRMEMFUNC_P (type))
+ goto ptrmem;
+ /* Fall through. */
+ case UNION_TYPE:
+ if (!COMPLETE_TYPE_P (type))
+ return true;
+
+ default:
+ /* All other types do not involve incomplete class types. */
+ return false;
+ }
}
/* Return a CONSTRUCTOR for the common part of the type_info objects. This
as comdat, because of pointers to incomplete.) */
static tree
-tinfo_base_init (desc, target)
- tree desc;
- tree target;
+tinfo_base_init (tree desc, tree target)
{
tree init = NULL_TREE;
tree name_decl;
+ tree vtable_ptr;
{
tree name_name;
NULL_TREE);
tree name_string = tinfo_name (target);
- if (flag_new_abi)
- name_name = mangle_typeinfo_for_type (target);
- else
- name_name = build_overload_with_type (tinfo_var_id, target);
+ /* Determine the name of the variable -- and remember with which
+ type it is associated. */
+ name_name = mangle_typeinfo_string_for_type (target);
+ TREE_TYPE (name_name) = target;
+
name_decl = build_lang_decl (VAR_DECL, name_name, name_type);
-
+ SET_DECL_ASSEMBLER_NAME (name_decl, name_name);
DECL_ARTIFICIAL (name_decl) = 1;
TREE_READONLY (name_decl) = 1;
TREE_STATIC (name_decl) = 1;
DECL_EXTERNAL (name_decl) = 0;
- TREE_PUBLIC (name_decl) = 1;
- comdat_linkage (name_decl);
- if (flag_new_abi)
- /* The new ABI specifies the external name of the string
- containing the type's name. */
- DECL_ASSEMBLER_NAME (name_decl)
- = mangle_typeinfo_string_for_type (target);
+ DECL_TINFO_P (name_decl) = 1;
+ if (involves_incomplete_p (target))
+ {
+ TREE_PUBLIC (name_decl) = 0;
+ DECL_INTERFACE_KNOWN (name_decl) = 1;
+ }
else
- DECL_ASSEMBLER_NAME (name_decl) = DECL_NAME (name_decl);
+ set_linkage_according_to_type (target, name_decl);
+ import_export_decl (name_decl);
DECL_INITIAL (name_decl) = name_string;
- cp_finish_decl (name_decl, name_string, NULL_TREE, 0);
+ mark_used (name_decl);
+ pushdecl_top_level_and_finish (name_decl, name_string);
}
-
- if (TINFO_VTABLE_DECL (desc))
+
+ vtable_ptr = TINFO_VTABLE_DECL (desc);
+ if (!vtable_ptr)
{
- tree vtbl_ptr = TINFO_VTABLE_DECL (desc);
- init = tree_cons (NULL_TREE, vtbl_ptr, init);
+ tree real_type;
+
+ push_nested_namespace (abi_node);
+ real_type = xref_tag (class_type, TINFO_REAL_NAME (desc),
+ true, false);
+ pop_nested_namespace (abi_node);
+
+ if (!COMPLETE_TYPE_P (real_type))
+ {
+ /* We never saw a definition of this type, so we need to
+ tell the compiler that this is an exported class, as
+ indeed all of the __*_type_info classes are. */
+ SET_CLASSTYPE_INTERFACE_KNOWN (real_type);
+ CLASSTYPE_INTERFACE_ONLY (real_type) = 1;
+ }
+
+ vtable_ptr = get_vtable_decl (real_type, /*complete=*/1);
+ vtable_ptr = build_unary_op (ADDR_EXPR, vtable_ptr, 0);
+
+ /* We need to point into the middle of the vtable. */
+ vtable_ptr = build2
+ (PLUS_EXPR, TREE_TYPE (vtable_ptr), vtable_ptr,
+ size_binop (MULT_EXPR,
+ size_int (2 * TARGET_VTABLE_DATA_ENTRY_DISTANCE),
+ TYPE_SIZE_UNIT (vtable_entry_type)));
+
+ TINFO_VTABLE_DECL (desc) = vtable_ptr;
}
+
+ init = tree_cons (NULL_TREE, vtable_ptr, init);
init = tree_cons (NULL_TREE, decay_conversion (name_decl), init);
- init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, nreverse (init));
- TREE_HAS_CONSTRUCTOR (init) = TREE_CONSTANT (init) = TREE_STATIC (init) = 1;
+ init = build_constructor (NULL_TREE, nreverse (init));
+ TREE_CONSTANT (init) = 1;
+ TREE_INVARIANT (init) = 1;
+ TREE_STATIC (init) = 1;
init = tree_cons (NULL_TREE, init, NULL_TREE);
return init;
additional fields to the type_info base. */
static tree
-generic_initializer (desc, target)
- tree desc;
- tree target;
+generic_initializer (tree desc, tree target)
{
tree init = tinfo_base_init (desc, target);
- init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, init);
- TREE_HAS_CONSTRUCTOR (init) = TREE_CONSTANT (init) = TREE_STATIC (init) = 1;
+ init = build_constructor (NULL_TREE, init);
+ TREE_CONSTANT (init) = 1;
+ TREE_INVARIANT (init) = 1;
+ TREE_STATIC (init) = 1;
return init;
}
which adds target type and qualifier flags members to the type_info base. */
static tree
-ptr_initializer (desc, target, non_public_ptr)
- tree desc;
- tree target;
- int *non_public_ptr;
+ptr_initializer (tree desc, tree target)
{
tree init = tinfo_base_init (desc, target);
tree to = TREE_TYPE (target);
int flags = qualifier_flags (to);
- int incomplete = target_incomplete_p (to);
+ bool incomplete = target_incomplete_p (to);
if (incomplete)
- {
- flags |= 8;
- *non_public_ptr = 1;
- }
- init = tree_cons (NULL_TREE, build_int_2 (flags, 0), init);
+ flags |= 8;
+ init = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, flags), init);
init = tree_cons (NULL_TREE,
- build_unary_op (ADDR_EXPR,
- get_tinfo_decl (TYPE_MAIN_VARIANT (to)), 0),
+ get_tinfo_ptr (TYPE_MAIN_VARIANT (to)),
init);
- init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, nreverse (init));
- TREE_HAS_CONSTRUCTOR (init) = TREE_CONSTANT (init) = TREE_STATIC (init) = 1;
+ init = build_constructor (NULL_TREE, nreverse (init));
+ TREE_CONSTANT (init) = 1;
+ TREE_INVARIANT (init) = 1;
+ TREE_STATIC (init) = 1;
return init;
}
base. */
static tree
-ptm_initializer (desc, target, non_public_ptr)
- tree desc;
- tree target;
- int *non_public_ptr;
+ptm_initializer (tree desc, tree target)
{
tree init = tinfo_base_init (desc, target);
tree to = TYPE_PTRMEM_POINTED_TO_TYPE (target);
tree klass = TYPE_PTRMEM_CLASS_TYPE (target);
int flags = qualifier_flags (to);
- int incomplete = target_incomplete_p (to);
+ bool incomplete = target_incomplete_p (to);
if (incomplete)
- {
- flags |= 0x8;
- *non_public_ptr = 1;
- }
+ flags |= 0x8;
if (!COMPLETE_TYPE_P (klass))
- {
- flags |= 0x10;
- *non_public_ptr = 1;
- }
- init = tree_cons (NULL_TREE, build_int_2 (flags, 0), init);
+ flags |= 0x10;
+ init = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, flags), init);
init = tree_cons (NULL_TREE,
- build_unary_op (ADDR_EXPR,
- get_tinfo_decl (TYPE_MAIN_VARIANT (to)), 0),
+ get_tinfo_ptr (TYPE_MAIN_VARIANT (to)),
init);
init = tree_cons (NULL_TREE,
- build_unary_op (ADDR_EXPR, get_tinfo_decl (klass), 0),
- init);
+ get_tinfo_ptr (klass),
+ init);
- init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, nreverse (init));
- TREE_HAS_CONSTRUCTOR (init) = TREE_CONSTANT (init) = TREE_STATIC (init) = 1;
+ init = build_constructor (NULL_TREE, nreverse (init));
+ TREE_CONSTANT (init) = 1;
+ TREE_INVARIANT (init) = 1;
+ TREE_STATIC (init) = 1;
return init;
}
-/* Check base BINFO to set hint flags in *DATA, which is really an int.
- We use CLASSTYPE_MARKED to tag types we've found as non-virtual bases and
- CLASSTYPE_MARKED2 to tag those which are virtual bases. Remember it is
- possible for a type to be both a virtual and non-virtual base. */
-
-static tree
-dfs_class_hint_mark (binfo, data)
- tree binfo;
- void *data;
-{
- tree basetype = BINFO_TYPE (binfo);
- int *hint = (int *) data;
-
- if (TREE_VIA_VIRTUAL (binfo))
- {
- if (CLASSTYPE_MARKED (basetype))
- *hint |= 1;
- if (CLASSTYPE_MARKED2 (basetype))
- *hint |= 2;
- SET_CLASSTYPE_MARKED2 (basetype);
- }
- else
- {
- if (CLASSTYPE_MARKED (basetype) || CLASSTYPE_MARKED2 (basetype))
- *hint |= 1;
- SET_CLASSTYPE_MARKED (basetype);
- }
- if (!TREE_VIA_PUBLIC (binfo) && TYPE_BINFO (basetype) != binfo)
- *hint |= 4;
- return NULL_TREE;
-};
-
-/* Clear the base's dfs marks, after searching for duplicate bases. */
-
-static tree
-dfs_class_hint_unmark (binfo, data)
- tree binfo;
- void *data ATTRIBUTE_UNUSED;
-{
- tree basetype = BINFO_TYPE (binfo);
-
- CLEAR_CLASSTYPE_MARKED (basetype);
- CLEAR_CLASSTYPE_MARKED2 (basetype);
- return NULL_TREE;
-}
-
-/* Determine the hint flags describing the features of a class's heirarchy. */
-
-static int
-class_hint_flags (type)
- tree type;
-{
- int hint_flags = 0;
- int i;
-
- dfs_walk (TYPE_BINFO (type), dfs_class_hint_mark, NULL, &hint_flags);
- dfs_walk (TYPE_BINFO (type), dfs_class_hint_unmark, NULL, NULL);
-
- for (i = 0; i < CLASSTYPE_N_BASECLASSES (type); ++i)
- {
- tree base_binfo = BINFO_BASETYPE (TYPE_BINFO (type), i);
-
- if (TREE_VIA_PUBLIC (base_binfo))
- hint_flags |= 0x8;
- }
- return hint_flags;
-}
-
/* Return the CONSTRUCTOR expr for a type_info of class TYPE.
DESC provides information about the particular __class_type_info derivation,
which adds hint flags and TRAIL initializers to the type_info base. */
static tree
-class_initializer (desc, target, trail)
- tree desc;
- tree target;
- tree trail;
+class_initializer (tree desc, tree target, tree trail)
{
tree init = tinfo_base_init (desc, target);
TREE_CHAIN (init) = trail;
- init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, init);
- TREE_HAS_CONSTRUCTOR (init) = TREE_CONSTANT (init) = TREE_STATIC (init) = 1;
+ init = build_constructor (NULL_TREE, init);
+ TREE_CONSTANT (init) = 1;
+ TREE_INVARIANT (init) = 1;
+ TREE_STATIC (init) = 1;
return init;
}
-/* Generate a pseudo_type_info VAR_DECL suitable for the supplied
- TARGET_TYPE and given the REAL_NAME. This is the structure expected by
- the runtime, and therefore has additional fields. If we need not emit a
- definition (because the runtime must contain it), return NULL_TREE,
- otherwise return the VAR_DECL. */
+/* Returns true if the typeinfo for type should be placed in
+ the runtime library. */
-static tree
-synthesize_tinfo_var (target_type, real_name)
- tree target_type;
- tree real_name;
+static bool
+typeinfo_in_lib_p (tree type)
{
- tree var_init = NULL_TREE;
- tree var_type = NULL_TREE;
- int non_public = 0;
-
- my_friendly_assert (new_abi_rtti_p (), 20000118);
+ /* The typeinfo objects for `T*' and `const T*' are in the runtime
+ library for simple types T. */
+ if (TREE_CODE (type) == POINTER_TYPE
+ && (cp_type_quals (TREE_TYPE (type)) == TYPE_QUAL_CONST
+ || cp_type_quals (TREE_TYPE (type)) == TYPE_UNQUALIFIED))
+ type = TREE_TYPE (type);
- switch (TREE_CODE (target_type))
+ switch (TREE_CODE (type))
{
+ case INTEGER_TYPE:
+ case BOOLEAN_TYPE:
+ case CHAR_TYPE:
+ case REAL_TYPE:
+ case VOID_TYPE:
+ return true;
+
+ default:
+ return false;
+ }
+}
+
+/* Generate the initializer for the type info describing TYPE. */
+
+static tree
+get_pseudo_ti_init (tree type, tree var_desc)
+{
+ gcc_assert (at_eof);
+ switch (TREE_CODE (type))
+ {
+ case OFFSET_TYPE:
+ return ptm_initializer (var_desc, type);
case POINTER_TYPE:
- if (TYPE_PTRMEM_P (target_type))
- {
- var_type = ptm_desc_type_node;
- var_init = ptm_initializer (var_type, target_type, &non_public);
- }
- else
- {
- int code = TREE_CODE (TREE_TYPE (target_type));
-
- if ((CP_TYPE_QUALS (TREE_TYPE (target_type)) | TYPE_QUAL_CONST)
- == TYPE_QUAL_CONST
- && (code == INTEGER_TYPE || code == BOOLEAN_TYPE
- || code == CHAR_TYPE || code == REAL_TYPE
- || code == VOID_TYPE)
- && !doing_runtime)
- /* These are in the runtime. */
- return NULL_TREE;
- var_type = ptr_desc_type_node;
- var_init = ptr_initializer (var_type, target_type, &non_public);
- }
- break;
+ return ptr_initializer (var_desc, type);
case ENUMERAL_TYPE:
- var_type = enum_desc_type_node;
- var_init = generic_initializer (var_type, target_type);
+ return generic_initializer (var_desc, type);
break;
case FUNCTION_TYPE:
- var_type = func_desc_type_node;
- var_init = generic_initializer (var_type, target_type);
+ return generic_initializer (var_desc, type);
break;
case ARRAY_TYPE:
- var_type = ary_desc_type_node;
- var_init = generic_initializer (var_type, target_type);
+ return generic_initializer (var_desc, type);
break;
case UNION_TYPE:
case RECORD_TYPE:
- if (TYPE_PTRMEMFUNC_P (target_type))
- {
- var_type = ptm_desc_type_node;
- var_init = ptm_initializer (var_type, target_type, &non_public);
- }
- else if (!COMPLETE_TYPE_P (target_type))
- {
- /* Emit a non-public class_type_info. */
- non_public = 1;
- var_type = class_desc_type_node;
- var_init = class_initializer (var_type, target_type, NULL_TREE);
- }
- else if (!CLASSTYPE_N_BASECLASSES (target_type))
- {
- var_type = class_desc_type_node;
- var_init = class_initializer (var_type, target_type, NULL_TREE);
- }
+ if (TYPE_PTRMEMFUNC_P (type))
+ return ptm_initializer (var_desc, type);
+ else if (var_desc == class_desc_type_node)
+ return class_initializer (var_desc, type, NULL_TREE);
+ else if (var_desc == si_class_desc_type_node)
+ {
+ tree base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), 0);
+ tree tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo));
+ tree base_inits = tree_cons (NULL_TREE, tinfo, NULL_TREE);
+
+ return class_initializer (var_desc, type, base_inits);
+ }
else
{
- /* if this has a single public non-virtual base, it's easier */
- tree binfo = TYPE_BINFO (target_type);
- int nbases = BINFO_N_BASETYPES (binfo);
- tree base_binfos = BINFO_BASETYPES (binfo);
+ int hint = ((CLASSTYPE_REPEATED_BASE_P (type) << 0)
+ | (CLASSTYPE_DIAMOND_SHAPED_P (type) << 1));
+ tree binfo = TYPE_BINFO (type);
+ int nbases = BINFO_N_BASE_BINFOS (binfo);
+ VEC (tree) *base_accesses = BINFO_BASE_ACCESSES (binfo);
tree base_inits = NULL_TREE;
- int is_simple = nbases == 1;
int ix;
/* Generate the base information initializer. */
for (ix = nbases; ix--;)
{
- tree base_binfo = TREE_VEC_ELT (base_binfos, ix);
+ tree base_binfo = BINFO_BASE_BINFO (binfo, ix);
tree base_init = NULL_TREE;
int flags = 0;
tree tinfo;
tree offset;
- if (TREE_VIA_VIRTUAL (base_binfo))
- flags |= 1;
- if (TREE_PUBLIC (base_binfo))
+ if (VEC_index (tree, base_accesses, ix) == access_public_node)
flags |= 2;
- tinfo = get_tinfo_decl (BINFO_TYPE (base_binfo));
- tinfo = build_unary_op (ADDR_EXPR, tinfo, 0);
- offset = get_base_offset (base_binfo, target_type);
-
- /* is it a single public inheritance? */
- if (is_simple && flags == 2 && integer_zerop (offset))
- {
- base_inits = tree_cons (NULL_TREE, tinfo, NULL_TREE);
- break;
- }
- is_simple = 0;
+ tinfo = get_tinfo_ptr (BINFO_TYPE (base_binfo));
+ if (BINFO_VIRTUAL_P (base_binfo))
+ {
+ /* We store the vtable offset at which the virtual
+ base offset can be found. */
+ offset = BINFO_VPTR_FIELD (base_binfo);
+ offset = convert (sizetype, offset);
+ flags |= 1;
+ }
+ else
+ offset = BINFO_OFFSET (base_binfo);
- /* combine offset and flags into one field */
+ /* Combine offset and flags into one field. */
offset = cp_build_binary_op (LSHIFT_EXPR, offset,
- build_int_2 (8, 0));
+ build_int_cst (NULL_TREE, 8));
offset = cp_build_binary_op (BIT_IOR_EXPR, offset,
- build_int_2 (flags, 0));
+ build_int_cst (NULL_TREE, flags));
base_init = tree_cons (NULL_TREE, offset, base_init);
base_init = tree_cons (NULL_TREE, tinfo, base_init);
- base_init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, base_init);
+ base_init = build_constructor (NULL_TREE, base_init);
base_inits = tree_cons (NULL_TREE, base_init, base_inits);
}
-
- if (is_simple)
- var_type = si_class_desc_type_node;
- else
- {
- int hint = class_hint_flags (target_type);
-
- base_inits = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, base_inits);
- base_inits = tree_cons (NULL_TREE, base_inits, NULL_TREE);
- /* Prepend the number of bases. */
- base_inits = tree_cons (NULL_TREE,
- build_int_2 (nbases, 0), base_inits);
- /* Prepend the hint flags. */
- base_inits = tree_cons (NULL_TREE,
- build_int_2 (hint, 0), base_inits);
- var_type = get_vmi_pseudo_type_info (nbases);
- }
- var_init = class_initializer (var_type, target_type, base_inits);
+ base_inits = build_constructor (NULL_TREE, base_inits);
+ base_inits = tree_cons (NULL_TREE, base_inits, NULL_TREE);
+ /* Prepend the number of bases. */
+ base_inits = tree_cons (NULL_TREE,
+ build_int_cst (NULL_TREE, nbases),
+ base_inits);
+ /* Prepend the hint flags. */
+ base_inits = tree_cons (NULL_TREE,
+ build_int_cst (NULL_TREE, hint),
+ base_inits);
+
+ return class_initializer (var_desc, type, base_inits);
}
break;
- case INTEGER_TYPE:
- case BOOLEAN_TYPE:
- case CHAR_TYPE:
- case REAL_TYPE:
- case VOID_TYPE:
- if (!doing_runtime)
- /* These are guaranteed to be in the runtime. */
- return NULL_TREE;
- var_type = bltn_desc_type_node;
- var_init = generic_initializer (var_type, target_type);
- break;
- default:
- my_friendly_abort (20000117);
- }
-
-
- return create_real_tinfo_var (real_name, TINFO_PSEUDO_TYPE (var_type),
- var_init, non_public);
-}
-
-/* Create the real typeinfo variable. NON_PUBLIC indicates that we cannot
- make this variable public (comdat). */
-static tree
-create_real_tinfo_var (name, type, init, non_public)
- tree name;
- tree type;
- tree init;
- int non_public;
-{
- static int count = 0;
- tree decl;
- tree hidden_name;
- char hidden[30];
-
- sprintf (hidden, "%.*s_%d",
- IDENTIFIER_LENGTH (tinfo_decl_id), IDENTIFIER_POINTER (tinfo_decl_id),
- count++);
- hidden_name = get_identifier (hidden);
-
- decl = build_lang_decl (VAR_DECL, hidden_name,
- build_qualified_type (type, TYPE_QUAL_CONST));
- DECL_ARTIFICIAL (decl) = 1;
- TREE_READONLY (decl) = 1;
- TREE_STATIC (decl) = 1;
- DECL_EXTERNAL (decl) = 0;
-
- if (!non_public)
- {
- TREE_PUBLIC (decl) = 1;
- comdat_linkage (decl);
+ default:
+ return generic_initializer (var_desc, type);
}
- DECL_ASSEMBLER_NAME (decl) = name;
- DECL_INITIAL (decl) = init;
- cp_finish_decl (decl, init, NULL_TREE, 0);
- pushdecl_top_level (decl);
- TREE_USED (decl) = 1;
- return decl;
}
/* Generate the RECORD_TYPE containing the data layout of a type_info
type's vtable. We explicitly manage the vtable member, and name it for
real type as used in the runtime. The RECORD type has a different name,
to avoid collisions. Return a TREE_LIST who's TINFO_PSEUDO_TYPE
- is the generated type and TINFO_VTABLE_DECL is the vtable decl.
+ is the generated type and TINFO_VTABLE_NAME is the name of the
+ vtable. We have to delay generating the VAR_DECL of the vtable
+ until the end of the translation, when we'll have seen the library
+ definition, if there was one.
REAL_NAME is the runtime's name of the type. Trailing arguments are
additional FIELD_DECL's for the structure. The final argument must be
NULL. */
static tree
-create_pseudo_type_info VPARAMS((const char *real_name, int ident, ...))
+create_pseudo_type_info (const char *real_name, int ident, ...)
{
-#ifndef ANSI_PROTOTYPES
- char const *real_name;
- int ident;
-#endif
- va_list ap;
- tree real_type, pseudo_type;
+ tree pseudo_type;
char *pseudo_name;
- tree vtable_decl;
- int ix;
- tree fields[10];
+ tree fields;
tree field_decl;
tree result;
-
- VA_START (ap, ident);
-#ifndef ANSI_PROTOTYPES
- real_name = va_arg (ap, char const *);
- ident = va_arg (app, int);
-#endif
-
- /* Generate the pseudo type name. */
- pseudo_name = (char *)alloca (strlen (real_name) + 30);
+ va_list ap;
+
+ va_start (ap, ident);
+
+ /* Generate the pseudo type name. */
+ pseudo_name = alloca (strlen (real_name) + 30);
strcpy (pseudo_name, real_name);
strcat (pseudo_name, "_pseudo");
if (ident)
sprintf (pseudo_name + strlen (pseudo_name), "%d", ident);
- /* Get the vtable decl. */
- real_type = xref_tag (class_type_node, get_identifier (real_name), 1);
- vtable_decl = get_vtable_decl (real_type, /*complete=*/1);
- vtable_decl = build_unary_op (ADDR_EXPR, vtable_decl, 0);
-
- /* Under the new ABI, we need to point into the middle of the
- vtable. */
- if (flag_new_abi)
- {
- vtable_decl = build (PLUS_EXPR,
- TREE_TYPE (vtable_decl),
- vtable_decl,
- size_binop (MULT_EXPR,
- size_int (2),
- TYPE_SIZE_UNIT (vtable_entry_type)));
- TREE_CONSTANT (vtable_decl) = 1;
- }
-
- /* First field is the pseudo type_info base class. */
- fields[0] = build_decl (FIELD_DECL, NULL_TREE, ti_desc_type_node);
+ /* First field is the pseudo type_info base class. */
+ fields = build_decl (FIELD_DECL, NULL_TREE, ti_desc_type_node);
/* Now add the derived fields. */
- for (ix = 0; (field_decl = va_arg (ap, tree));)
- fields[++ix] = field_decl;
+ while ((field_decl = va_arg (ap, tree)))
+ {
+ TREE_CHAIN (field_decl) = fields;
+ fields = field_decl;
+ }
- /* Create the pseudo type. */
+ /* Create the pseudo type. */
pseudo_type = make_aggr_type (RECORD_TYPE);
- finish_builtin_type (pseudo_type, pseudo_name, fields, ix, ptr_type_node);
- TYPE_HAS_CONSTRUCTOR (pseudo_type) = 1;
- va_end (ap);
-
+ finish_builtin_struct (pseudo_type, pseudo_name, fields, NULL_TREE);
+ CLASSTYPE_AS_BASE (pseudo_type) = pseudo_type;
+
result = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
- TINFO_VTABLE_DECL (result) = vtable_decl;
- TINFO_PSEUDO_TYPE (result) = pseudo_type;
+ TINFO_REAL_NAME (result) = get_identifier (real_name);
+ TINFO_PSEUDO_TYPE (result) =
+ cp_build_qualified_type (pseudo_type, TYPE_QUAL_CONST);
+ va_end (ap);
return result;
}
-/* Return a descriptor for a vmi type with NUM_BASES bases. */
+/* Return a pseudo type info type node used to describe TYPE. TYPE
+ must be a complete type (or cv void), except at the end of the
+ translation unit. */
static tree
-get_vmi_pseudo_type_info (num_bases)
- int num_bases;
+get_pseudo_ti_desc (tree type)
{
- tree desc;
- tree array_domain, base_array;
-
- if (TREE_VEC_LENGTH (vmi_class_desc_type_node) <= num_bases)
+ switch (TREE_CODE (type))
{
- int ix;
- tree extend = make_tree_vec (num_bases + 5);
-
- for (ix = TREE_VEC_LENGTH (vmi_class_desc_type_node); ix--;)
- TREE_VEC_ELT (extend, ix) = TREE_VEC_ELT (vmi_class_desc_type_node, ix);
- vmi_class_desc_type_node = extend;
- }
- desc = TREE_VEC_ELT (vmi_class_desc_type_node, num_bases);
-
- if (desc)
- return desc;
+ case OFFSET_TYPE:
+ return ptm_desc_type_node;
+ case POINTER_TYPE:
+ return ptr_desc_type_node;
+ case ENUMERAL_TYPE:
+ return enum_desc_type_node;
+ case FUNCTION_TYPE:
+ return func_desc_type_node;
+ case ARRAY_TYPE:
+ return ary_desc_type_node;
+ case UNION_TYPE:
+ case RECORD_TYPE:
+ if (TYPE_PTRMEMFUNC_P (type))
+ return ptm_desc_type_node;
+ else if (!COMPLETE_TYPE_P (type))
+ {
+ if (!at_eof)
+ cxx_incomplete_type_error (NULL_TREE, type);
+ return class_desc_type_node;
+ }
+ else if (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type)))
+ return class_desc_type_node;
+ else
+ {
+ tree binfo = TYPE_BINFO (type);
+ VEC (tree) *base_accesses = BINFO_BASE_ACCESSES (binfo);
+ tree base_binfo = BINFO_BASE_BINFO (binfo, 0);
+ int num_bases = BINFO_N_BASE_BINFOS (binfo);
+
+ if (num_bases == 1
+ && VEC_index (tree, base_accesses, 0) == access_public_node
+ && !BINFO_VIRTUAL_P (base_binfo)
+ && integer_zerop (BINFO_OFFSET (base_binfo)))
+ /* single non-virtual public. */
+ return si_class_desc_type_node;
+ else
+ {
+ tree var_desc;
+ tree array_domain, base_array;
+
+ if (TREE_VEC_LENGTH (vmi_class_desc_type_node) <= num_bases)
+ {
+ int ix;
+ tree extend = make_tree_vec (num_bases + 5);
+
+ for (ix = TREE_VEC_LENGTH (vmi_class_desc_type_node); ix--;)
+ TREE_VEC_ELT (extend, ix)
+ = TREE_VEC_ELT (vmi_class_desc_type_node, ix);
+ vmi_class_desc_type_node = extend;
+ }
+ var_desc = TREE_VEC_ELT (vmi_class_desc_type_node, num_bases);
+ if (var_desc)
+ return var_desc;
- /* Add number of bases and trailing array of base_class_type_info. */
- array_domain = build_index_type (build_int_2 (num_bases, 0));
- base_array = build_array_type (base_desc_type_node, array_domain);
-
- push_nested_namespace (abi_node);
-
- desc = create_pseudo_type_info
- ("__vmi_class_type_info", num_bases,
- build_decl (FIELD_DECL, NULL_TREE, integer_type_node),
- build_decl (FIELD_DECL, NULL_TREE, integer_type_node),
- build_decl (FIELD_DECL, NULL_TREE, base_array),
- NULL);
-
- pop_nested_namespace (abi_node);
-
- TREE_VEC_ELT (vmi_class_desc_type_node, num_bases) = desc;
- return desc;
+ /* Create the array of __base_class_type_info entries.
+ G++ 3.2 allocated an array that had one too many
+ entries, and then filled that extra entries with
+ zeros. */
+ if (abi_version_at_least (2))
+ array_domain = build_index_type (size_int (num_bases - 1));
+ else
+ array_domain = build_index_type (size_int (num_bases));
+ base_array =
+ build_array_type (base_desc_type_node, array_domain);
+
+ push_nested_namespace (abi_node);
+ var_desc = create_pseudo_type_info
+ ("__vmi_class_type_info", num_bases,
+ build_decl (FIELD_DECL, NULL_TREE, integer_type_node),
+ build_decl (FIELD_DECL, NULL_TREE, integer_type_node),
+ build_decl (FIELD_DECL, NULL_TREE, base_array),
+ NULL);
+ pop_nested_namespace (abi_node);
+
+ TREE_VEC_ELT (vmi_class_desc_type_node, num_bases) = var_desc;
+ return var_desc;
+ }
+ }
+ default:
+ return bltn_desc_type_node;
+ }
}
/* Make sure the required builtin types exist for generating the type_info
- varable definitions. */
+ variable definitions. */
static void
-create_tinfo_types ()
+create_tinfo_types (void)
{
- tree ptr_type_info;
-
- if (bltn_desc_type_node)
- return;
- push_nested_namespace (abi_node);
+ gcc_assert (!ti_desc_type_node);
- ptr_type_info = build_pointer_type
- (build_qualified_type
- (type_info_type_node, TYPE_QUAL_CONST));
+ push_nested_namespace (abi_node);
/* Create the internal type_info structure. This is used as a base for
the other structures. */
{
- tree fields[2];
+ tree field, fields;
ti_desc_type_node = make_aggr_type (RECORD_TYPE);
- fields[0] = build_decl (FIELD_DECL, NULL_TREE, const_ptr_type_node);
- fields[1] = build_decl (FIELD_DECL, NULL_TREE, const_string_type_node);
- finish_builtin_type (ti_desc_type_node, "__type_info_pseudo",
- fields, 1, ptr_type_node);
+ field = build_decl (FIELD_DECL, NULL_TREE, const_ptr_type_node);
+ fields = field;
+
+ field = build_decl (FIELD_DECL, NULL_TREE, const_string_type_node);
+ TREE_CHAIN (field) = fields;
+ fields = field;
+
+ finish_builtin_struct (ti_desc_type_node, "__type_info_pseudo",
+ fields, NULL_TREE);
TYPE_HAS_CONSTRUCTOR (ti_desc_type_node) = 1;
}
("__fundamental_type_info", 0,
NULL);
- /* Array, function and enum type_info. No additional fields. */
+ /* Array, function and enum type_info. No additional fields. */
ary_desc_type_node = create_pseudo_type_info
("__array_type_info", 0,
NULL);
This is really a descendant of __class_type_info. */
si_class_desc_type_node = create_pseudo_type_info
("__si_class_type_info", 0,
- build_decl (FIELD_DECL, NULL_TREE, ptr_type_info),
+ build_decl (FIELD_DECL, NULL_TREE, type_info_ptr_type),
NULL);
/* Base class internal helper. Pointer to base type, offset to base,
- flags. */
+ flags. */
{
- tree fields[2];
+ tree field, fields;
+
+ field = build_decl (FIELD_DECL, NULL_TREE, type_info_ptr_type);
+ fields = field;
- fields[0] = build_decl (FIELD_DECL, NULL_TREE, ptr_type_info);
- fields[1] = build_decl (FIELD_DECL, NULL_TREE, integer_types[itk_long]);
+ field = build_decl (FIELD_DECL, NULL_TREE, integer_types[itk_long]);
+ TREE_CHAIN (field) = fields;
+ fields = field;
+
base_desc_type_node = make_aggr_type (RECORD_TYPE);
- finish_builtin_type (base_desc_type_node, "__base_class_type_info_pseudo",
- fields, 1, ptr_type_node);
+ finish_builtin_struct (base_desc_type_node, "__base_class_type_info_pseudo",
+ fields, NULL_TREE);
TYPE_HAS_CONSTRUCTOR (base_desc_type_node) = 1;
}
- /* General heirarchy is created as necessary in this vector. */
+ /* General hierarchy is created as necessary in this vector. */
vmi_class_desc_type_node = make_tree_vec (10);
/* Pointer type_info. Adds two fields, qualification mask
and pointer to the pointed to type. This is really a descendant of
- __pbase_type_info. */
+ __pbase_type_info. */
ptr_desc_type_node = create_pseudo_type_info
("__pointer_type_info", 0,
build_decl (FIELD_DECL, NULL_TREE, integer_type_node),
- build_decl (FIELD_DECL, NULL_TREE, ptr_type_info),
+ build_decl (FIELD_DECL, NULL_TREE, type_info_ptr_type),
NULL);
/* Pointer to member data type_info. Add qualifications flags,
ptm_desc_type_node = create_pseudo_type_info
("__pointer_to_member_type_info", 0,
build_decl (FIELD_DECL, NULL_TREE, integer_type_node),
- build_decl (FIELD_DECL, NULL_TREE, ptr_type_info),
- build_decl (FIELD_DECL, NULL_TREE, ptr_type_info),
+ build_decl (FIELD_DECL, NULL_TREE, type_info_ptr_type),
+ build_decl (FIELD_DECL, NULL_TREE, type_info_ptr_type),
NULL);
pop_nested_namespace (abi_node);
/* Emit the type_info descriptors which are guaranteed to be in the runtime
support. Generating them here guarantees consistency with the other
structures. We use the following heuristic to determine when the runtime
- is being generated. If std::__fundamental_type_info is defined, and it's
+ is being generated. If std::__fundamental_type_info is defined, and its
destructor is defined, then the runtime is being built. */
void
-emit_support_tinfos ()
+emit_support_tinfos (void)
{
static tree *const fundamentals[] =
{
tree bltn_type, dtor;
push_nested_namespace (abi_node);
- bltn_type = xref_tag (class_type_node,
- get_identifier ("__fundamental_type_info"), 1);
+ bltn_type = xref_tag (class_type,
+ get_identifier ("__fundamental_type_info"),
+ true, false);
pop_nested_namespace (abi_node);
if (!COMPLETE_TYPE_P (bltn_type))
return;
- dtor = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (bltn_type), 1);
+ dtor = CLASSTYPE_DESTRUCTORS (bltn_type);
if (DECL_EXTERNAL (dtor))
return;
doing_runtime = 1;
}
}
-/* Return non-zero, iff T is a type_info variable which has not had a
- definition emitted for it. */
+/* Finish a type info decl. DECL_PTR is a pointer to an unemitted
+ tinfo decl. Determine whether it needs emitting, and if so
+ generate the initializer. */
-int
-tinfo_decl_p (t, data)
- tree t;
- void *data ATTRIBUTE_UNUSED;
+bool
+emit_tinfo_decl (tree decl)
{
- return TREE_CODE (t) == VAR_DECL
- && IDENTIFIER_GLOBAL_VALUE (DECL_NAME (t)) == (t)
- && TREE_TYPE (t) == tinfo_decl_type
- && TREE_TYPE (DECL_NAME (t));
-}
+ tree type = TREE_TYPE (DECL_NAME (decl));
+ int in_library = typeinfo_in_lib_p (type);
+ tree var_desc, var_init;
-/* Emit a suitable type_info definition for the type_info decl pointed to by
- DECL_PTR. We emit a completely new variable, of the correct type for the
- actual type this is describing. The DECL_ASSEMBLER_NAME of the generated
- definition is set to that of the supplied decl, so that they can be tied
- up. Mark the supplied decl as having been dealt with. Emitting one
- definition might cause other definitions to be required.
-
- We need to do things this way, because we're trying to do something like
-
- struct B : A {
- ...
- };
-
- extern const A tinfo_var;
-
- const B tinfo_var = {...};
-
- which is not permitted. Also, we've not necessarily seen the definition of B.
- So we do something like the following,
-
- extern const A tinfo_var;
-
- struct pseudo_A {
- const void *vtable_ptr;
- const char *name;
- };
- struct pseudo_B {
- pseudo_A base;
- ...
- };
-
- const pseudo_B proxy_tinfo_var attribute((assembler_name="tinfo_var")) =
- {
- {&B::vtable, "..."},
- ...
- };
-
- pseudo_A and pseudo_B must be layout equivalent to the real definitions in
- the runtime. */
-
-int
-emit_tinfo_decl (decl_ptr, data)
- tree *decl_ptr;
- void *data ATTRIBUTE_UNUSED;
-{
- tree tinfo_decl = *decl_ptr;
- tree tinfo_type, decl;
-
- my_friendly_assert (TREE_TYPE (tinfo_decl) == tinfo_decl_type, 20000121);
- tinfo_type = TREE_TYPE (DECL_NAME (tinfo_decl));
- my_friendly_assert (tinfo_type != NULL_TREE, 20000120);
-
- if (!DECL_NEEDED_P (tinfo_decl))
- return 0;
- /* Say we've dealt with it. */
- TREE_TYPE (DECL_NAME (tinfo_decl)) = NULL_TREE;
+ gcc_assert (DECL_TINFO_P (decl));
- create_tinfo_types ();
- decl = synthesize_tinfo_var (tinfo_type, DECL_ASSEMBLER_NAME (tinfo_decl));
-
- return decl != 0;
+ if (in_library)
+ {
+ if (doing_runtime)
+ DECL_EXTERNAL (decl) = 0;
+ else
+ {
+ /* If we're not in the runtime, then DECL (which is already
+ DECL_EXTERNAL) will not be defined here. */
+ DECL_INTERFACE_KNOWN (decl) = 1;
+ return false;
+ }
+ }
+ else if (involves_incomplete_p (type))
+ {
+ if (!decl_needed_p (decl))
+ return false;
+ /* If TYPE involves an incomplete class type, then the typeinfo
+ object will be emitted with internal linkage. There is no
+ way to know whether or not types are incomplete until the end
+ of the compilation, so this determination must be deferred
+ until this point. */
+ TREE_PUBLIC (decl) = 0;
+ DECL_EXTERNAL (decl) = 0;
+ DECL_INTERFACE_KNOWN (decl) = 1;
+ }
+
+ import_export_decl (decl);
+ if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
+ {
+ DECL_EXTERNAL (decl) = 0;
+ var_desc = get_pseudo_ti_desc (type);
+ var_init = get_pseudo_ti_init (type, var_desc);
+ DECL_INITIAL (decl) = var_init;
+ mark_used (decl);
+ cp_finish_decl (decl, var_init, NULL_TREE, 0);
+ return true;
+ }
+ else
+ return false;
}
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