/* RunTime Type Identification
- Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001
+ Free Software Foundation, Inc.
Mostly written by Jason Merrill (jason@cygnus.com).
This file is part of GNU CC.
#include "assert.h"
#include "toplev.h"
-#ifndef INT_TYPE_SIZE
-#define INT_TYPE_SIZE BITS_PER_WORD
-#endif
+/* 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. */
+#define TINFO_PSEUDO_TYPE(NODE) TREE_TYPE (NODE)
+/* The VAR_DECL of the vtable for the type_info derived class. */
+#define TINFO_VTABLE_DECL(NODE) TREE_VALUE (NODE)
extern struct obstack permanent_obstack;
-static tree call_void_fn PROTO((char *));
-static tree build_headof_sub PROTO((tree));
-static tree build_headof PROTO((tree));
-static tree get_tinfo_var PROTO((tree));
-static tree get_typeid_1 PROTO((tree));
-static tree ifnonnull PROTO((tree, tree));
-static tree build_dynamic_cast_1 PROTO((tree, tree));
-static void expand_si_desc PROTO((tree, tree));
-static void expand_class_desc PROTO((tree, tree));
-static void expand_attr_desc PROTO((tree, tree));
-static void expand_ptr_desc PROTO((tree, tree));
-static void expand_generic_desc PROTO((tree, tree, char *));
-static tree throw_bad_cast PROTO((void));
-static tree throw_bad_typeid PROTO((void));
-
-tree type_info_type_node;
-tree tinfo_fn_id;
-tree tinfo_fn_type;
+static tree build_headof_sub PARAMS((tree));
+static tree build_headof 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 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, 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));
+static int typeinfo_in_lib_p PARAMS((tree));
+
+static int doing_runtime = 0;
\f
void
init_rtti_processing ()
{
if (flag_honor_std)
- push_namespace (get_identifier ("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 ();
- tinfo_fn_id = get_identifier ("__tf");
- tinfo_fn_type = build_function_type
- (build_reference_type (build_type_variant (type_info_type_node, 1, 0)),
- void_list_node);
+ /* 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
/* Given the expression EXP of type `class *', return the head of the
object pointed to by EXP with type cv void*, if the class has any
- virtual functions (TYPE_VIRTUAL_P), else just return the
+ virtual functions (TYPE_POLYMORPHIC_P), else just return the
expression. */
static tree
tree type = TREE_TYPE (exp);
tree aref;
tree offset;
+ tree index;
- if (TREE_CODE (type) != POINTER_TYPE)
- {
- error ("`headof' applied to non-pointer type");
- return error_mark_node;
- }
+ my_friendly_assert (TREE_CODE (type) == POINTER_TYPE, 20000112);
type = TREE_TYPE (type);
- if (!TYPE_VIRTUAL_P (type))
+ if (!TYPE_POLYMORPHIC_P (type))
return exp;
/* If we don't have rtti stuff, get to a sub-object that does. */
/* We use this a couple of times below, protect it. */
exp = save_expr (exp);
- aref = build_vtbl_ref (build_indirect_ref (exp, NULL_PTR), integer_zero_node);
+ /* Under the new ABI, the offset-to-top field is at index -2 from
+ the vptr. */
+ index = build_int_2 (-2, -1);
+
+ aref = build_vtbl_ref (build_indirect_ref (exp, NULL), index);
if (flag_vtable_thunks)
offset = aref;
else
offset = build_component_ref (aref, delta_identifier, NULL_TREE, 0);
- type = build_type_variant (ptr_type_node, TREE_READONLY (exp),
- TREE_THIS_VOLATILE (exp));
+ 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));
}
-/* Build a call to a generic entry point taking and returning void. */
-
-static tree
-call_void_fn (name)
- char *name;
-{
- tree d = get_identifier (name);
- tree type;
-
- if (IDENTIFIER_GLOBAL_VALUE (d))
- d = IDENTIFIER_GLOBAL_VALUE (d);
- else
- {
- push_obstacks (&permanent_obstack, &permanent_obstack);
-
- type = build_function_type (void_type_node, void_list_node);
- d = build_lang_decl (FUNCTION_DECL, d, type);
- DECL_EXTERNAL (d) = 1;
- TREE_PUBLIC (d) = 1;
- DECL_ARTIFICIAL (d) = 1;
- pushdecl_top_level (d);
- make_function_rtl (d);
- assemble_external (d);
-
- pop_obstacks ();
- }
-
- return build_call (d, void_type_node, NULL_TREE);
-}
-
/* Get a bad_cast node for the program to throw...
See libstdc++/exception.cc for __throw_bad_cast */
static tree
throw_bad_cast ()
{
- return call_void_fn ("__throw_bad_cast");
+ tree fn = get_identifier ("__cxa_bad_cast");
+ if (IDENTIFIER_GLOBAL_VALUE (fn))
+ fn = IDENTIFIER_GLOBAL_VALUE (fn);
+ else
+ fn = push_throw_library_fn (fn, build_function_type (ptr_type_node,
+ void_list_node));
+
+ return build_call (fn, NULL_TREE);
}
static tree
throw_bad_typeid ()
{
- return call_void_fn ("__throw_bad_typeid");
+ tree fn = get_identifier ("__cxa_bad_typeid");
+ if (IDENTIFIER_GLOBAL_VALUE (fn))
+ fn = IDENTIFIER_GLOBAL_VALUE (fn);
+ else
+ {
+ 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);
}
\f
-/* Return the type_info function associated with the expression EXP. If
- EXP is a reference to a polymorphic class, return the dynamic type;
+/* 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;
otherwise return the static type of the expression. */
-tree
-get_tinfo_fn_dynamic (exp)
+static tree
+get_tinfo_decl_dynamic (exp)
tree exp;
{
tree type;
-
+
if (exp == error_mark_node)
return error_mark_node;
- if (type_unknown_p (exp))
- {
- error ("typeid of overloaded function");
- return error_mark_node;
- }
-
type = TREE_TYPE (exp);
/* peel back references, so they match. */
/* Peel off cv qualifiers. */
type = TYPE_MAIN_VARIANT (type);
+
+ if (!VOID_TYPE_P (type))
+ type = complete_type_or_else (type, exp);
+
+ if (!type)
+ return error_mark_node;
/* If exp is a reference to polymorphic type, get the real type_info. */
- if (TYPE_VIRTUAL_P (type) && ! resolves_to_fixed_type_p (exp, 0))
+ 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)
- {
- warning ("taking dynamic typeid of object without -frtti");
- push_obstacks (&permanent_obstack, &permanent_obstack);
- init_rtti_processing ();
- pop_obstacks ();
- flag_rtti = 1;
- }
+ error ("taking dynamic typeid of object with -fno-rtti");
/* 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_unary_op (ADDR_EXPR, exp, 0);
exp = build_headof_sub (exp);
- exp = build_indirect_ref (exp, NULL_PTR);
+ exp = build_indirect_ref (exp, NULL);
}
- if (flag_vtable_thunks)
- t = build_vfn_ref ((tree *) 0, exp, integer_one_node);
- else
- t = build_vfn_ref ((tree *) 0, exp, integer_zero_node);
- TREE_TYPE (t) = build_pointer_type (tinfo_fn_type);
+ /* The RTTI information is at index -1. */
+ index = integer_minus_one_node;
+ t = build_vfn_ref ((tree *) 0, exp, index);
+ TREE_TYPE (t) = build_pointer_type (tinfo_decl_type);
return t;
}
/* otherwise return the type_info for the static type of the expr. */
- return get_tinfo_fn (TYPE_MAIN_VARIANT (type));
+ exp = get_tinfo_decl (TYPE_MAIN_VARIANT (type));
+ return build_unary_op (ADDR_EXPR, exp, 0);
}
tree
build_typeid (exp)
tree exp;
{
- exp = get_tinfo_fn_dynamic (exp);
- exp = build_call (exp, TREE_TYPE (tinfo_fn_type), NULL_TREE);
- return convert_from_reference (exp);
-}
-
-tree
-build_x_typeid (exp)
- tree exp;
-{
tree cond = NULL_TREE;
- tree type = TREE_TYPE (tinfo_fn_type);
- int nonnull;
+ int nonnull = 0;
+ if (! flag_rtti)
+ {
+ error ("cannot use typeid with -fno-rtti");
+ 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, exp);
if (TREE_CODE (exp) == INDIRECT_REF
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
- && TYPE_VIRTUAL_P (TREE_TYPE (exp))
+ && TYPE_POLYMORPHIC_P (TREE_TYPE (exp))
&& ! resolves_to_fixed_type_p (exp, &nonnull)
&& ! nonnull)
{
cond = cp_convert (boolean_type_node, TREE_OPERAND (exp, 0));
}
- exp = get_tinfo_fn_dynamic (exp);
+ exp = get_tinfo_decl_dynamic (exp);
if (exp == error_mark_node)
return error_mark_node;
- exp = build_call (exp, type, NULL_TREE);
+ exp = tinfo_from_decl (exp);
if (cond)
{
tree bad = throw_bad_typeid ();
- bad = build_compound_expr
- (expr_tree_cons (NULL_TREE, bad, build_expr_list
- (NULL_TREE, cp_convert (type, integer_zero_node))));
- exp = build (COND_EXPR, type, cond, exp, bad);
+ exp = build (COND_EXPR, TREE_TYPE (exp), cond, exp, bad);
}
return convert_from_reference (exp);
}
+/* Generate the NTBS name of a type. */
static tree
-get_tinfo_var (type)
+tinfo_name (type)
tree type;
{
- tree tname = build_overload_with_type (get_identifier ("__ti"), type);
- tree tdecl, arrtype;
- int size;
-
- 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_VOLATILE (type) || TYPE_READONLY (type))
- 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_USES_COMPLEX_INHERITANCE (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;
-
- push_obstacks (&permanent_obstack, &permanent_obstack);
-
- /* 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)));
-
- tdecl = build_decl (VAR_DECL, tname, arrtype);
- TREE_PUBLIC (tdecl) = 1;
- DECL_EXTERNAL (tdecl) = 1;
- DECL_ARTIFICIAL (tdecl) = 1;
- pushdecl_top_level (tdecl);
- cp_finish_decl (tdecl, NULL_TREE, NULL_TREE, 0, 0);
-
- pop_obstacks ();
+ const char *name;
+ tree name_string;
- return tdecl;
+ name = mangle_type_string (type);
+ name_string = combine_strings (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. */
+
tree
-get_tinfo_fn (type)
+get_tinfo_decl (type)
tree type;
{
tree name;
tree d;
+ if (COMPLETE_TYPE_P (type)
+ && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
+ {
+ cp_error ("cannot create type information for type `%T' because its size is variable",
+ type);
+ return error_mark_node;
+ }
+
if (TREE_CODE (type) == OFFSET_TYPE)
type = TREE_TYPE (type);
if (TREE_CODE (type) == METHOD_TYPE)
type = build_function_type (TREE_TYPE (type),
TREE_CHAIN (TYPE_ARG_TYPES (type)));
- name = build_overload_with_type (tinfo_fn_id, type);
-
- if (IDENTIFIER_GLOBAL_VALUE (name))
- return IDENTIFIER_GLOBAL_VALUE (name);
+ name = mangle_typeinfo_for_type (type);
- push_obstacks (&permanent_obstack, &permanent_obstack);
-
- d = build_lang_decl (FUNCTION_DECL, name, tinfo_fn_type);
- DECL_EXTERNAL (d) = 1;
- TREE_PUBLIC (d) = 1;
- DECL_ARTIFICIAL (d) = 1;
- DECL_NOT_REALLY_EXTERN (d) = 1;
- DECL_MUTABLE_P (d) = 1;
- TREE_TYPE (name) = copy_to_permanent (type);
-
- pushdecl_top_level (d);
- make_function_rtl (d);
- assemble_external (d);
- mark_inline_for_output (d);
- if (at_eof)
- import_export_decl (d);
-
- pop_obstacks ();
+ d = IDENTIFIER_GLOBAL_VALUE (name);
+ if (d)
+ /* OK */;
+ 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 that 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_ARTIFICIAL (d) = 1;
+ DECL_ALIGN (d) = TYPE_ALIGN (ptr_type_node);
+ DECL_USER_ALIGN (d) = 0;
+ TREE_READONLY (d) = 1;
+ TREE_STATIC (d) = 1;
+ DECL_EXTERNAL (d) = 1;
+ TREE_PUBLIC (d) = 1;
+ if (flag_weak || !typeinfo_in_lib_p (d))
+ comdat_linkage (d);
+ SET_DECL_ASSEMBLER_NAME (d, name);
+ cp_finish_decl (d, NULL_TREE, NULL_TREE, 0);
+ pushdecl_top_level (d);
+ /* Remember the type it is for. */
+ TREE_TYPE (name) = type;
+ TREE_USED (name) = 1;
+ }
return d;
}
+/* Given an expr produced by get_tinfo_decl, return an expr which
+ produces a reference to the type_info object. */
+
static tree
+tinfo_from_decl (expr)
+ tree expr;
+{
+ tree t;
+
+ 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;
{
- tree t = build_call
- (get_tinfo_fn (type), TREE_TYPE (tinfo_fn_type), NULL_TREE);
+ tree t;
+
+ t = get_tinfo_decl (type);
+ t = tinfo_from_decl (t);
return convert_from_reference (t);
}
-/* Return the type_info object for TYPE, creating it if necessary. */
+/* Return the type_info object for TYPE. */
tree
get_typeid (type)
{
if (type == error_mark_node)
return error_mark_node;
-
- if (! flag_rtti)
+
+ if (!COMPLETE_TYPE_P (type_info_type_node))
{
- warning ("requesting typeid of object without -frtti");
- push_obstacks (&permanent_obstack, &permanent_obstack);
- init_rtti_processing ();
- pop_obstacks ();
- flag_rtti = 1;
+ error ("must #include <typeinfo> before using typeid");
+ return error_mark_node;
}
-
+
if (processing_template_decl)
return build_min_nt (TYPEID_EXPR, type);
that is the operand of typeid are always ignored. */
type = TYPE_MAIN_VARIANT (type);
+ if (!VOID_TYPE_P (type))
+ type = complete_type_or_else (type, NULL_TREE);
+
+ if (!type)
+ return error_mark_node;
+
return get_typeid_1 (type);
}
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;
+{
+ 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)));
+
+}
+
/* Execute a dynamic cast, as described in section 5.2.6 of the 9/93 working
paper. */
{
enum tree_code tc = TREE_CODE (type);
tree exprtype = TREE_TYPE (expr);
- enum tree_code ec;
tree dcast_fn;
+ tree old_expr = expr;
+ const char *errstr = NULL;
- assert (exprtype != NULL_TREE);
- ec = TREE_CODE (exprtype);
-
+ /* T shall be a pointer or reference to a complete class type, or
+ `pointer to cv void''. */
switch (tc)
{
case POINTER_TYPE:
- if (ec == REFERENCE_TYPE)
- {
- expr = convert_from_reference (expr);
- exprtype = TREE_TYPE (expr);
- ec = TREE_CODE (exprtype);
- }
- if (ec != POINTER_TYPE)
- goto fail;
- if (TREE_CODE (TREE_TYPE (exprtype)) != RECORD_TYPE)
- goto fail;
- if (TYPE_SIZE (complete_type (TREE_TYPE (exprtype))) == NULL_TREE)
- goto fail;
- if (TREE_READONLY (TREE_TYPE (exprtype))
- && ! TYPE_READONLY (TREE_TYPE (type)))
- goto fail;
- if (TYPE_MAIN_VARIANT (TREE_TYPE (type)) == void_type_node)
+ if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
break;
- /* else fall through */
case REFERENCE_TYPE:
- if (TREE_CODE (TREE_TYPE (type)) != RECORD_TYPE)
- goto fail;
- if (TYPE_SIZE (complete_type (TREE_TYPE (type))) == NULL_TREE)
- goto fail;
+ if (! IS_AGGR_TYPE (TREE_TYPE (type)))
+ {
+ errstr = "target is not pointer or reference to class";
+ goto fail;
+ }
+ if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (type))))
+ {
+ errstr = "target is not pointer or reference to complete type";
+ goto fail;
+ }
break;
- /* else fall through */
+
default:
+ errstr = "target is not pointer or reference";
goto fail;
}
- /* Apply trivial conversion T -> T& for dereferenced ptrs. */
- if (ec == RECORD_TYPE)
+ 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)
{
- exprtype = build_type_variant (exprtype, TREE_READONLY (expr),
- TREE_THIS_VOLATILE (expr));
+ /* Apply trivial conversion T -> T& for dereferenced ptrs. */
exprtype = build_reference_type (exprtype);
expr = convert_to_reference (exprtype, expr, CONV_IMPLICIT,
LOOKUP_NORMAL, NULL_TREE);
- ec = REFERENCE_TYPE;
}
- if (tc == REFERENCE_TYPE)
+ exprtype = TREE_TYPE (expr);
+
+ if (tc == POINTER_TYPE)
+ {
+ /* If T is a pointer type, v shall be an rvalue of a pointer to
+ complete class type, and the result is an rvalue of type T. */
+
+ if (TREE_CODE (exprtype) != POINTER_TYPE)
+ {
+ errstr = "source is not a pointer";
+ goto fail;
+ }
+ if (! IS_AGGR_TYPE (TREE_TYPE (exprtype)))
+ {
+ errstr = "source is not a pointer to class";
+ goto fail;
+ }
+ if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype))))
+ {
+ errstr = "source is a pointer to incomplete type";
+ goto fail;
+ }
+ }
+ else
+ {
+ /* T is a reference type, v shall be an lvalue of a complete class
+ type, and the result is an lvalue of the type referred to by T. */
+
+ if (! IS_AGGR_TYPE (TREE_TYPE (exprtype)))
+ {
+ errstr = "source is not of class type";
+ goto fail;
+ }
+ if (!COMPLETE_TYPE_P (complete_type (TREE_TYPE (exprtype))))
+ {
+ errstr = "source is of incomplete class type";
+ goto fail;
+ }
+
+ }
+
+ /* The dynamic_cast operator shall not cast away constness. */
+ if (!at_least_as_qualified_p (TREE_TYPE (type),
+ TREE_TYPE (exprtype)))
{
- if (ec != REFERENCE_TYPE)
- goto fail;
- if (TREE_CODE (TREE_TYPE (exprtype)) != RECORD_TYPE)
- goto fail;
- if (TYPE_SIZE (complete_type (TREE_TYPE (exprtype))) == NULL_TREE)
- goto fail;
- if (TREE_READONLY (TREE_TYPE (exprtype))
- && ! TYPE_READONLY (TREE_TYPE (type)))
- goto fail;
+ errstr = "conversion casts away constness";
+ goto fail;
}
/* If *type is an unambiguous accessible base class of *exprtype,
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;
+ }
+
if (distance >= 0)
- return build_vbase_path (PLUS_EXPR, type, expr, path, 0);
+ {
+ expr = build_vbase_path (PLUS_EXPR, type, expr, path, 0);
+ if (TREE_CODE (exprtype) == POINTER_TYPE)
+ expr = non_lvalue (expr);
+ return expr;
+ }
}
/* Otherwise *exprtype must be a polymorphic class (have a vtbl). */
- if (TYPE_VIRTUAL_P (TREE_TYPE (exprtype)))
+ if (TYPE_POLYMORPHIC_P (TREE_TYPE (exprtype)))
{
tree expr1;
/* if TYPE is `void *', return pointer to complete object. */
- if (tc == POINTER_TYPE
- && TYPE_MAIN_VARIANT (TREE_TYPE (type)) == void_type_node)
+ if (tc == POINTER_TYPE && VOID_TYPE_P (TREE_TYPE (type)))
{
/* if b is an object, dynamic_cast<void *>(&b) == (void *)&b. */
if (TREE_CODE (expr) == ADDR_EXPR
else
{
tree retval;
- tree result, td1, td2, td3, elems, expr2;
+ tree result, td2, td3, elems;
+ tree static_type, target_type, boff;
/* If we got here, we can't convert statically. Therefore,
dynamic_cast<D&>(b) (b an object) cannot succeed. */
- if (ec == REFERENCE_TYPE)
+ if (tc == REFERENCE_TYPE)
{
- if (TREE_CODE (expr) == VAR_DECL
- && TREE_CODE (TREE_TYPE (expr)) == RECORD_TYPE)
+ if (TREE_CODE (old_expr) == VAR_DECL
+ && TREE_CODE (TREE_TYPE (old_expr)) == RECORD_TYPE)
{
+ tree expr = throw_bad_cast ();
cp_warning ("dynamic_cast of `%#D' to `%#T' can never succeed",
- expr, type);
- return throw_bad_cast ();
+ old_expr, type);
+ /* Bash it to the expected type. */
+ TREE_TYPE (expr) = type;
+ return expr;
}
}
/* Ditto for dynamic_cast<D*>(&b). */
&& TREE_CODE (TREE_TYPE (op)) == RECORD_TYPE)
{
cp_warning ("dynamic_cast of `%#D' to `%#T' can never succeed",
- expr, type);
+ op, type);
retval = build_int_2 (0, 0);
TREE_TYPE (retval) = type;
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);
+
+ /* Determine how T and V are related. */
+ boff = get_dynamic_cast_base_type (static_type, target_type);
+
/* Since expr is used twice below, save it. */
expr = save_expr (expr);
if (tc == REFERENCE_TYPE)
expr1 = build_unary_op (ADDR_EXPR, expr1, 0);
- /* Build run-time conversion. */
- expr2 = build_headof (expr1);
-
- if (ec == POINTER_TYPE)
- td1 = get_tinfo_fn_dynamic (build_indirect_ref (expr, NULL_PTR));
- else
- td1 = get_tinfo_fn_dynamic (expr);
- td1 = decay_conversion (td1);
-
- td2 = decay_conversion
- (get_tinfo_fn (TYPE_MAIN_VARIANT (TREE_TYPE (type))));
- td3 = decay_conversion
- (get_tinfo_fn (TYPE_MAIN_VARIANT (TREE_TYPE (exprtype))));
-
- elems = tree_cons
- (NULL_TREE, td1, tree_cons
- (NULL_TREE, td2, tree_cons
- (NULL_TREE, build_int_2 (1, 0), tree_cons
- (NULL_TREE, expr2, tree_cons
- (NULL_TREE, td3, tree_cons
- (NULL_TREE, expr1, NULL_TREE))))));
-
- dcast_fn = get_identifier ("__dynamic_cast");
- if (IDENTIFIER_GLOBAL_VALUE (dcast_fn))
- dcast_fn = IDENTIFIER_GLOBAL_VALUE (dcast_fn);
- else
+ 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;
-
- push_obstacks (&permanent_obstack, &permanent_obstack);
+ tree tinfo_ptr;
+ tree ns = abi_node;
+ const char *name;
+
+ push_nested_namespace (ns);
+ 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, TREE_TYPE (td1), tree_cons
- (NULL_TREE, TREE_TYPE (td1), tree_cons
- (NULL_TREE, integer_type_node, tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, TREE_TYPE (td1), tree_cons
- (NULL_TREE, ptr_type_node, void_list_node))))));
+ (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_lang_decl (FUNCTION_DECL, dcast_fn, tmp);
- DECL_EXTERNAL (dcast_fn) = 1;
- TREE_PUBLIC (dcast_fn) = 1;
- DECL_ARTIFICIAL (dcast_fn) = 1;
- pushdecl_top_level (dcast_fn);
- make_function_rtl (dcast_fn);
- assemble_external (dcast_fn);
- pop_obstacks ();
+ dcast_fn = build_library_fn_ptr (name, tmp);
+ pop_nested_namespace (ns);
+ dynamic_cast_node = dcast_fn;
}
-
- result = build_call
- (dcast_fn, TREE_TYPE (TREE_TYPE (dcast_fn)), elems);
+ result = build_call (dcast_fn, elems);
if (tc == REFERENCE_TYPE)
{
- expr1 = throw_bad_cast ();
- expr1 = build_compound_expr
- (expr_tree_cons (NULL_TREE, expr1,
- build_expr_list (NULL_TREE, cp_convert (type, integer_zero_node))));
- TREE_TYPE (expr1) = type;
+ tree bad = throw_bad_cast ();
+
result = save_expr (result);
- return build (COND_EXPR, type, result, result, expr1);
+ return build (COND_EXPR, type, result, result, bad);
}
/* Now back to the type we want from a void*. */
return ifnonnull (expr, result);
}
}
+ else
+ errstr = "source type is not polymorphic";
fail:
- cp_error ("cannot dynamic_cast `%E' (of type `%#T') to type `%#T'",
- expr, exprtype, type);
+ cp_error ("cannot dynamic_cast `%E' (of type `%#T') to type `%#T' (%s)",
+ expr, exprtype, type, errstr);
return error_mark_node;
}
return error_mark_node;
if (processing_template_decl)
- return build_min (DYNAMIC_CAST_EXPR, copy_to_permanent (type), expr);
+ 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.
+/* Return the runtime bit mask encoding the qualifiers of TYPE. */
- 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.
+static int
+qualifier_flags (type)
+ tree type;
+{
+ int flags = 0;
+ /* we want the qualifiers on this type, not any array core, it might have */
+ int quals = TYPE_QUALS (type);
+
+ if (quals & TYPE_QUAL_CONST)
+ flags |= 1;
+ if (quals & TYPE_QUAL_VOLATILE)
+ flags |= 2;
+ if (quals & TYPE_QUAL_RESTRICT)
+ flags |= 4;
+ return flags;
+}
- Note: these constructors always return the address of the descriptor
- info, since that is simplest for their mutual interaction. */
+/* Return non-zero, if the pointer chain TYPE ends at an incomplete type, or
+ contains a pointer to member of an incomplete class. */
-extern tree const_string_type_node;
+static int
+target_incomplete_p (type)
+ tree type;
+{
+ while (TREE_CODE (type) == POINTER_TYPE)
+ if (TYPE_PTRMEM_P (type))
+ {
+ if (!COMPLETE_TYPE_P (TYPE_PTRMEM_CLASS_TYPE (type)))
+ return 1;
+ type = TYPE_PTRMEM_POINTED_TO_TYPE (type);
+ }
+ else
+ type = TREE_TYPE (type);
+ if (!COMPLETE_OR_VOID_TYPE_P (type))
+ return 1;
+
+ return 0;
+}
-/* Build an initializer for a __si_type_info node. */
+/* Return a CONSTRUCTOR for the common part of the type_info objects. This
+ is the vtable pointer and NTBS name. The NTBS name is emitted as a
+ comdat const char array, so it becomes a unique key for the type. Generate
+ and emit that VAR_DECL here. (We can't always emit the type_info itself
+ as comdat, because of pointers to incomplete.) */
-static void
-expand_si_desc (tdecl, type)
- tree tdecl;
- tree type;
+static tree
+tinfo_base_init (desc, target)
+ tree desc;
+ tree target;
{
- tree t, elems, fn;
- char *name = build_overload_name (type, 1, 1);
- tree name_string = combine_strings (build_string (strlen (name)+1, name));
-
- type = BINFO_TYPE (TREE_VEC_ELT (TYPE_BINFO_BASETYPES (type), 0));
- expand_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;
- push_obstacks (&permanent_obstack, &permanent_obstack);
- 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)));
- tmp = build_function_type (void_type_node, tmp);
+ tree init = NULL_TREE;
+ tree name_decl;
+
+ {
+ tree name_name;
+
+ /* Generate the NTBS array variable. */
+ tree name_type = build_cplus_array_type
+ (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
+ NULL_TREE);
+ tree name_string = tinfo_name (target);
+
+ name_name = mangle_typeinfo_string_for_type (target);
+ name_decl = build_lang_decl (VAR_DECL, name_name, name_type);
+
+ 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);
+ /* The new ABI specifies the external name of the string
+ containing the type's name. */
+ SET_DECL_ASSEMBLER_NAME (name_decl,
+ mangle_typeinfo_string_for_type (target));
+ DECL_INITIAL (name_decl) = name_string;
+ cp_finish_decl (name_decl, name_string, NULL_TREE, 0);
+ pushdecl_top_level (name_decl);
+ }
- fn = build_lang_decl (FUNCTION_DECL, fn, tmp);
- DECL_EXTERNAL (fn) = 1;
- TREE_PUBLIC (fn) = 1;
- DECL_ARTIFICIAL (fn) = 1;
- pushdecl_top_level (fn);
- make_function_rtl (fn);
- assemble_external (fn);
- pop_obstacks ();
+ if (TINFO_VTABLE_DECL (desc))
+ {
+ tree vtbl_ptr = TINFO_VTABLE_DECL (desc);
+ init = tree_cons (NULL_TREE, vtbl_ptr, init);
}
-
- fn = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), elems);
- expand_expr_stmt (fn);
+
+ 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 = tree_cons (NULL_TREE, init, NULL_TREE);
+
+ return init;
}
-/* Build an initializer for a __class_type_info node. */
+/* Return the CONSTRUCTOR expr for a type_info of TYPE. DESC provides the
+ information about the particular type_info derivation, which adds no
+ additional fields to the type_info base. */
-static void
-expand_class_desc (tdecl, type)
- tree tdecl;
- tree type;
+static tree
+generic_initializer (desc, target)
+ tree desc;
+ tree target;
{
- tree name_string;
- tree fn, tmp;
- char *name;
-
- int i = CLASSTYPE_N_BASECLASSES (type);
- int base_cnt = 0;
- tree binfos = TYPE_BINFO_BASETYPES (type);
-#if 0
- /* See code below that used these. */
- tree vb = CLASSTYPE_VBASECLASSES (type);
- int n_base = i;
-#endif
- tree base, elems, access, offset, isvir;
- tree elt, elts = NULL_TREE;
- static tree base_info_type_node;
+ 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;
+ return init;
+}
- if (base_info_type_node == NULL_TREE)
- {
- tree fields [4];
-
- /* A reasonably close approximation of __class_type_info::base_info */
-
- push_obstacks (&permanent_obstack, &permanent_obstack);
- base_info_type_node = make_lang_type (RECORD_TYPE);
-
- /* Actually const __user_type_info * */
- fields [0] = build_lang_field_decl
- (FIELD_DECL, NULL_TREE,
- build_pointer_type (build_type_variant (type_info_type_node, 1, 0)));
- fields [1] = build_lang_field_decl
- (FIELD_DECL, NULL_TREE, unsigned_intSI_type_node);
- DECL_BIT_FIELD (fields[1]) = 1;
- DECL_FIELD_SIZE (fields[1]) = 29;
-
- fields [2] = build_lang_field_decl
- (FIELD_DECL, NULL_TREE, boolean_type_node);
- DECL_BIT_FIELD (fields[2]) = 1;
- DECL_FIELD_SIZE (fields[2]) = 1;
-
- /* Actually enum access */
- fields [3] = build_lang_field_decl
- (FIELD_DECL, NULL_TREE, integer_type_node);
- DECL_BIT_FIELD (fields[3]) = 1;
- DECL_FIELD_SIZE (fields[3]) = 2;
-
- finish_builtin_type (base_info_type_node, "__base_info", fields,
- 3, ptr_type_node);
- pop_obstacks ();
- }
+/* Return the CONSTRUCTOR expr for a type_info of pointer TYPE.
+ DESC provides information about the particular type_info derivation,
+ which adds target type and qualifier flags members to the type_info base. */
- while (--i >= 0)
+static tree
+ptr_initializer (desc, target, non_public_ptr)
+ tree desc;
+ tree target;
+ int *non_public_ptr;
+{
+ tree init = tinfo_base_init (desc, target);
+ tree to = TREE_TYPE (target);
+ int flags = qualifier_flags (to);
+ int incomplete = target_incomplete_p (to);
+
+ if (incomplete)
{
- tree binfo = TREE_VEC_ELT (binfos, i);
-
- expand_expr_stmt (get_typeid_1 (BINFO_TYPE (binfo)));
- base = decay_conversion (get_tinfo_var (BINFO_TYPE (binfo)));
+ flags |= 8;
+ *non_public_ptr = 1;
+ }
+ init = tree_cons (NULL_TREE, build_int_2 (flags, 0), init);
+ init = tree_cons (NULL_TREE,
+ build_unary_op (ADDR_EXPR,
+ get_tinfo_decl (TYPE_MAIN_VARIANT (to)), 0),
+ init);
+
+ init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, nreverse (init));
+ TREE_HAS_CONSTRUCTOR (init) = TREE_CONSTANT (init) = TREE_STATIC (init) = 1;
+ return init;
+}
- if (TREE_VIA_VIRTUAL (binfo))
- {
- tree t = BINFO_TYPE (binfo);
- char *name;
- tree field;
-
- name = (char *) alloca (TYPE_NAME_LENGTH (t)+sizeof (VBASE_NAME)+1);
- sprintf (name, VBASE_NAME_FORMAT, TYPE_NAME_STRING (t));
- field = lookup_field (type, get_identifier (name), 0, 0);
- offset = size_binop (FLOOR_DIV_EXPR,
- DECL_FIELD_BITPOS (field), size_int (BITS_PER_UNIT));
- offset = convert (sizetype, offset);
- }
- else
- offset = BINFO_OFFSET (binfo);
+/* Return the CONSTRUCTOR expr for a type_info of pointer to member data TYPE.
+ DESC provides information about the particular type_info derivation,
+ which adds class, target type and qualifier flags members to the type_info
+ base. */
- 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_info_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 = expr_tree_cons (NULL_TREE, elt, elts);
- base_cnt++;
+static tree
+ptm_initializer (desc, target, non_public_ptr)
+ tree desc;
+ tree target;
+ int *non_public_ptr;
+{
+ 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);
+
+ if (incomplete)
+ {
+ flags |= 0x8;
+ *non_public_ptr = 1;
}
-#if 0
- i = n_base;
- while (vb)
+ if (!COMPLETE_TYPE_P (klass))
{
- tree b;
- access = access_public_node;
- while (--i >= 0)
- {
- b = TREE_VEC_ELT (binfos, i);
- if (BINFO_TYPE (vb) == BINFO_TYPE (b) && TREE_VIA_VIRTUAL (b))
- {
- if (TREE_VIA_PUBLIC (b))
- access = access_public_node;
- else if (TREE_VIA_PROTECTED (b))
- access = access_protected_node;
- else
- access = access_private_node;
- break;
- }
- }
- base = build_t_desc (BINFO_TYPE (vb), 1);
- offset = BINFO_OFFSET (vb);
- isvir = build_int_2 (1, 0);
+ flags |= 0x10;
+ *non_public_ptr = 1;
+ }
+ init = tree_cons (NULL_TREE, build_int_2 (flags, 0), init);
+ init = tree_cons (NULL_TREE,
+ build_unary_op (ADDR_EXPR,
+ get_tinfo_decl (TYPE_MAIN_VARIANT (to)), 0),
+ init);
+ init = tree_cons (NULL_TREE,
+ build_unary_op (ADDR_EXPR, get_tinfo_decl (klass), 0),
+ init);
+
+ init = build (CONSTRUCTOR, NULL_TREE, NULL_TREE, nreverse (init));
+ TREE_HAS_CONSTRUCTOR (init) = TREE_CONSTANT (init) = TREE_STATIC (init) = 1;
+ return init;
+}
- base_list = expr_tree_cons (NULL_TREE, base, base_list);
- isvir_list = expr_tree_cons (NULL_TREE, isvir, isvir_list);
- acc_list = expr_tree_cons (NULL_TREE, access, acc_list);
- off_list = expr_tree_cons (NULL_TREE, offset, off_list);
+/* 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. */
- base_cnt++;
- vb = TREE_CHAIN (vb);
+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);
}
-#endif
+ 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;
+};
- name = build_overload_name (type, 1, 1);
- name_string = combine_strings (build_string (strlen (name)+1, name));
+/* Clear the base's dfs marks, after searching for duplicate bases. */
- {
- tree arrtype = build_array_type (base_info_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);
- }
+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;
+}
- 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))));
+/* Determine the hint flags describing the features of a class's heirarchy. */
- fn = get_identifier ("__rtti_class");
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
- {
- push_obstacks (&permanent_obstack, &permanent_obstack);
- tmp = tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, const_string_type_node, tree_cons
- (NULL_TREE, build_pointer_type (base_info_type_node), tree_cons
- (NULL_TREE, sizetype, void_list_node))));
- tmp = build_function_type (void_type_node, tmp);
+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);
- fn = build_lang_decl (FUNCTION_DECL, fn, tmp);
- DECL_EXTERNAL (fn) = 1;
- TREE_PUBLIC (fn) = 1;
- DECL_ARTIFICIAL (fn) = 1;
- pushdecl_top_level (fn);
- make_function_rtl (fn);
- assemble_external (fn);
- pop_obstacks ();
+ 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. */
- fn = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), elems);
- expand_expr_stmt (fn);
+static tree
+class_initializer (desc, target, trail)
+ 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;
+ return init;
}
-/* Build an initializer for a __pointer_type_info node. */
+/* Returns non-zero if the typeinfo for type should be placed in
+ the runtime library. */
-static void
-expand_ptr_desc (tdecl, type)
- tree tdecl;
+static int
+typeinfo_in_lib_p (type)
tree type;
{
- tree t, elems, fn;
- char *name = build_overload_name (type, 1, 1);
- tree name_string = combine_strings (build_string (strlen (name)+1, name));
+ /* 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);
- type = TREE_TYPE (type);
- expand_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
+ switch (TREE_CODE (type))
{
- tree tmp;
- push_obstacks (&permanent_obstack, &permanent_obstack);
- 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)));
- tmp = build_function_type (void_type_node, tmp);
-
- fn = build_lang_decl (FUNCTION_DECL, fn, tmp);
- DECL_EXTERNAL (fn) = 1;
- TREE_PUBLIC (fn) = 1;
- DECL_ARTIFICIAL (fn) = 1;
- pushdecl_top_level (fn);
- make_function_rtl (fn);
- assemble_external (fn);
- pop_obstacks ();
+ case INTEGER_TYPE:
+ case BOOLEAN_TYPE:
+ case CHAR_TYPE:
+ case REAL_TYPE:
+ case VOID_TYPE:
+ return 1;
+
+ default:
+ return 0;
}
+}
+
+/* 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. */
+
+static tree
+synthesize_tinfo_var (target_type, real_name)
+ tree target_type;
+ tree real_name;
+{
+ tree var_init = NULL_TREE;
+ tree var_type = NULL_TREE;
+ int non_public = 0;
+
+ switch (TREE_CODE (target_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
+ {
+ if (typeinfo_in_lib_p (target_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;
+ case ENUMERAL_TYPE:
+ var_type = enum_desc_type_node;
+ var_init = generic_initializer (var_type, target_type);
+ break;
+ case FUNCTION_TYPE:
+ var_type = func_desc_type_node;
+ var_init = generic_initializer (var_type, target_type);
+ break;
+ case ARRAY_TYPE:
+ var_type = ary_desc_type_node;
+ var_init = generic_initializer (var_type, target_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);
+ }
+ 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);
+ 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_init = NULL_TREE;
+ int flags = 0;
+ tree tinfo;
+ tree offset;
+
+ if (TREE_VIA_VIRTUAL (base_binfo))
+ flags |= 1;
+ if (TREE_PUBLIC (base_binfo))
+ 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;
+
+ /* combine offset and flags into one field */
+ offset = cp_build_binary_op (LSHIFT_EXPR, offset,
+ build_int_2 (8, 0));
+ offset = cp_build_binary_op (BIT_IOR_EXPR, offset,
+ build_int_2 (flags, 0));
+ 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_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);
+ }
+ break;
- fn = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), elems);
- expand_expr_stmt (fn);
+ default:
+ if (typeinfo_in_lib_p (target_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;
+ }
+ my_friendly_abort (20000117);
+ }
+
+
+ return create_real_tinfo_var (target_type,
+ real_name, TINFO_PSEUDO_TYPE (var_type),
+ var_init, non_public);
}
-/* Build an initializer for a __attr_type_info node. */
+/* Create the real typeinfo variable. NON_PUBLIC indicates that we cannot
+ make this variable public (comdat). */
-static void
-expand_attr_desc (tdecl, type)
- tree tdecl;
+static tree
+create_real_tinfo_var (target_type, name, type, init, non_public)
+ tree target_type;
+ tree name;
tree type;
+ tree init;
+ int non_public;
{
- tree elems, t, fn;
- char *name = build_overload_name (type, 1, 1);
- tree name_string = combine_strings (build_string (strlen (name)+1, name));
- tree attrval = build_int_2
- (TYPE_READONLY (type) | TYPE_VOLATILE (type) * 2, 0);
-
- expand_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, expr_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;
- push_obstacks (&permanent_obstack, &permanent_obstack);
- 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))));
- tmp = build_function_type (void_type_node, tmp);
+ 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;
- fn = build_lang_decl (FUNCTION_DECL, fn, tmp);
- DECL_EXTERNAL (fn) = 1;
- TREE_PUBLIC (fn) = 1;
- DECL_ARTIFICIAL (fn) = 1;
- pushdecl_top_level (fn);
- make_function_rtl (fn);
- assemble_external (fn);
- pop_obstacks ();
+ if (!non_public)
+ {
+ TREE_PUBLIC (decl) = 1;
+ if (flag_weak || !typeinfo_in_lib_p (target_type))
+ comdat_linkage (decl);
}
-
- fn = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), elems);
- expand_expr_stmt (fn);
+ SET_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;
}
-/* Build an initializer for a type_info node that just has a name. */
+/* Generate the RECORD_TYPE containing the data layout of a type_info
+ derivative as used by the runtime. This layout must be consistent with
+ that defined in the runtime support. Also generate the VAR_DECL for the
+ 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.
+
+ 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 void
-expand_generic_desc (tdecl, type, fnname)
- tree tdecl;
- tree type;
- char *fnname;
+static tree
+create_pseudo_type_info VPARAMS((const char *real_name, int ident, ...))
{
- char *name = build_overload_name (type, 1, 1);
- tree name_string = combine_strings (build_string (strlen (name)+1, name));
- tree elems = tree_cons
- (NULL_TREE, decay_conversion (tdecl), tree_cons
- (NULL_TREE, decay_conversion (name_string), NULL_TREE));
+#ifndef ANSI_PROTOTYPES
+ char const *real_name;
+ int ident;
+#endif
+ va_list ap;
+ tree real_type, pseudo_type;
+ char *pseudo_name;
+ tree vtable_decl;
+ int ix;
+ tree fields[10];
+ 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
- tree fn = get_identifier (fnname);
- if (IDENTIFIER_GLOBAL_VALUE (fn))
- fn = IDENTIFIER_GLOBAL_VALUE (fn);
- else
- {
- tree tmp;
- push_obstacks (&permanent_obstack, &permanent_obstack);
- tmp = tree_cons
- (NULL_TREE, ptr_type_node, tree_cons
- (NULL_TREE, const_string_type_node, void_list_node));
- tmp = build_function_type (void_type_node, tmp);
+ /* Generate the pseudo type name. */
+ pseudo_name = (char *)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. */
+ 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);
- fn = build_lang_decl (FUNCTION_DECL, fn, tmp);
- DECL_EXTERNAL (fn) = 1;
- TREE_PUBLIC (fn) = 1;
- DECL_ARTIFICIAL (fn) = 1;
- pushdecl_top_level (fn);
- make_function_rtl (fn);
- assemble_external (fn);
- pop_obstacks ();
+ /* Now add the derived fields. */
+ for (ix = 0; (field_decl = va_arg (ap, tree));)
+ fields[++ix] = field_decl;
+
+ /* 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);
+
+ result = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
+ TINFO_VTABLE_DECL (result) = vtable_decl;
+ TINFO_PSEUDO_TYPE (result) = pseudo_type;
+
+ return result;
+}
+
+/* Return a descriptor for a vmi type with NUM_BASES bases. */
+
+static tree
+get_vmi_pseudo_type_info (num_bases)
+ int num_bases;
+{
+ tree 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;
}
+ desc = TREE_VEC_ELT (vmi_class_desc_type_node, num_bases);
+
+ if (desc)
+ return desc;
+
+ /* Add number of bases and trailing array of base_class_type_info. */
+ 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);
+
+ 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);
- fn = build_call (fn, TREE_TYPE (TREE_TYPE (fn)), elems);
- expand_expr_stmt (fn);
+ TREE_VEC_ELT (vmi_class_desc_type_node, num_bases) = desc;
+ return desc;
}
-/* Generate the code for a type_info initialization function.
- Note that we take advantage of the passage
+/* Make sure the required builtin types exist for generating the type_info
+ varable definitions. */
- 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.
+static void
+create_tinfo_types ()
+{
+ tree ptr_type_info;
+
+ if (bltn_desc_type_node)
+ return;
+ push_nested_namespace (abi_node);
+
+ ptr_type_info = build_pointer_type
+ (build_qualified_type
+ (type_info_type_node, TYPE_QUAL_CONST));
+
+ /* Create the internal type_info structure. This is used as a base for
+ the other structures. */
+ {
+ tree fields[2];
+
+ 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);
+ TYPE_HAS_CONSTRUCTOR (ti_desc_type_node) = 1;
+ }
+
+ /* Fundamental type_info */
+ bltn_desc_type_node = create_pseudo_type_info
+ ("__fundamental_type_info", 0,
+ NULL);
+
+ /* Array, function and enum type_info. No additional fields. */
+ ary_desc_type_node = create_pseudo_type_info
+ ("__array_type_info", 0,
+ NULL);
+ func_desc_type_node = create_pseudo_type_info
+ ("__function_type_info", 0,
+ NULL);
+ enum_desc_type_node = create_pseudo_type_info
+ ("__enum_type_info", 0,
+ NULL);
+
+ /* Class type_info. Add a flags field. */
+ class_desc_type_node = create_pseudo_type_info
+ ("__class_type_info", 0,
+ NULL);
+
+ /* Single public non-virtual base class. Add pointer to base class.
+ 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),
+ NULL);
+
+ /* Base class internal helper. Pointer to base type, offset to base,
+ flags. */
+ {
+ tree fields[2];
+
+ fields[0] = build_decl (FIELD_DECL, NULL_TREE, ptr_type_info);
+ fields[1] = build_decl (FIELD_DECL, NULL_TREE, integer_types[itk_long]);
+ 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);
+ TYPE_HAS_CONSTRUCTOR (base_desc_type_node) = 1;
+ }
+
+ /* General heirarchy 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. */
+ 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),
+ NULL);
+
+ /* Pointer to member data type_info. Add qualifications flags,
+ pointer to the member's type info and pointer to the class.
+ This is really a descendant of __pbase_type_info. */
+ 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),
+ NULL);
+
+ pop_nested_namespace (abi_node);
+}
- 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)! */
+/* 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
+ destructor is defined, then the runtime is being built. */
void
-synthesize_tinfo_fn (fndecl)
- tree fndecl;
+emit_support_tinfos ()
{
- tree type = TREE_TYPE (DECL_NAME (fndecl));
- tree tmp, addr;
-
- tree 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);
- cp_finish_decl (tdecl, NULL_TREE, NULL_TREE, 0, 0);
-
- start_function (NULL_TREE, fndecl, NULL_TREE, 1);
- store_parm_decls ();
- clear_last_expr ();
- push_momentary ();
-
- /* If the first word of the array (the vtable) is non-zero, we've already
- initialized the object, so don't do it again. */
- addr = decay_conversion (tdecl);
- tmp = cp_convert (build_pointer_type (ptr_type_node), addr);
- tmp = build_indirect_ref (tmp, 0);
- tmp = build_binary_op (EQ_EXPR, tmp, integer_zero_node, 1);
- expand_start_cond (tmp, 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_VOLATILE (type) || TYPE_READONLY (type))
- 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))
+ static tree *const fundamentals[] =
+ {
+ &void_type_node,
+ &boolean_type_node,
+ &wchar_type_node,
+ &char_type_node, &signed_char_type_node, &unsigned_char_type_node,
+ &short_integer_type_node, &short_unsigned_type_node,
+ &integer_type_node, &unsigned_type_node,
+ &long_integer_type_node, &long_unsigned_type_node,
+ &long_long_integer_type_node, &long_long_unsigned_type_node,
+ &float_type_node, &double_type_node, &long_double_type_node,
+ 0
+ };
+ int ix;
+ tree bltn_type, dtor;
+
+ push_nested_namespace (abi_node);
+ bltn_type = xref_tag (class_type_node,
+ get_identifier ("__fundamental_type_info"), 1);
+ pop_nested_namespace (abi_node);
+ if (!COMPLETE_TYPE_P (bltn_type))
+ return;
+ dtor = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (bltn_type), 1);
+ if (DECL_EXTERNAL (dtor))
+ return;
+ doing_runtime = 1;
+ for (ix = 0; fundamentals[ix]; ix++)
{
- if (CLASSTYPE_N_BASECLASSES (type) == 0)
- expand_generic_desc (tdecl, type, "__rtti_user");
- else if (! TYPE_USES_COMPLEX_INHERITANCE (type)
- && (TREE_VIA_PUBLIC
- (TREE_VEC_ELT (TYPE_BINFO_BASETYPES (type), 0))))
- expand_si_desc (tdecl, type);
- else
- expand_class_desc (tdecl, type);
+ tree bltn = *fundamentals[ix];
+ tree bltn_ptr = build_pointer_type (bltn);
+ tree bltn_const_ptr = build_pointer_type
+ (build_qualified_type (bltn, TYPE_QUAL_CONST));
+ tree tinfo;
+
+ tinfo = get_tinfo_decl (bltn);
+ TREE_USED (tinfo) = 1;
+ TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (tinfo)) = 1;
+
+ tinfo = get_tinfo_decl (bltn_ptr);
+ TREE_USED (tinfo) = 1;
+ TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (tinfo)) = 1;
+
+ tinfo = get_tinfo_decl (bltn_const_ptr);
+ TREE_USED (tinfo) = 1;
+ TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (tinfo)) = 1;
}
- else if (TREE_CODE (type) == ENUMERAL_TYPE)
- expand_generic_desc (tdecl, type, "__rtti_user");
- else
- my_friendly_abort (252);
+}
- expand_end_cond ();
+/* Return non-zero, iff T is a type_info variable which has not had a
+ definition emitted for it. */
- /* OK, now return the type_info object. */
- tmp = cp_convert (build_pointer_type (type_info_type_node), addr);
- tmp = build_indirect_ref (tmp, 0);
- c_expand_return (tmp);
- finish_function (lineno, 0, 0);
+int
+tinfo_decl_p (t, data)
+ tree t;
+ void *data ATTRIBUTE_UNUSED;
+{
+ return TREE_CODE (t) == VAR_DECL
+ && IDENTIFIER_GLOBAL_VALUE (DECL_NAME (t)) == (t)
+ && TREE_TYPE (t) == tinfo_decl_type
+ && TREE_TYPE (DECL_NAME (t));
+}
+
+/* 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;
+
+ create_tinfo_types ();
+ decl = synthesize_tinfo_var (tinfo_type, DECL_ASSEMBLER_NAME (tinfo_decl));
+
+ return decl != 0;
}
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