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msvcrt: Support 64-bit RTTI in __RTDynamicCast.

This commit is contained in:
Piotr Caban 2012-09-05 14:35:56 +02:00 committed by Alexandre Julliard
parent fbae5a95c3
commit 33937f039f
2 changed files with 140 additions and 0 deletions
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113
dlls/msvcrt/cpp.c
View File

@ -117,6 +117,37 @@ static void dump_obj_locator( const rtti_object_locator *ptr )
}
}
#ifdef __x86_64__
static void dump_obj_locator_x64( const rtti_object_locator_x64 *ptr )
{
int i;
char *base = (char*)ptr - ptr->object_locator;
const rtti_object_hierarchy_x64 *h = (const rtti_object_hierarchy_x64*)(base + ptr->type_hierarchy);
const type_info *type_descriptor = (const type_info*)(base + ptr->type_descriptor);
TRACE( "%p: sig=%08x base_offset=%08x flags=%08x type=%p %s hierarchy=%p\n",
ptr, ptr->signature, ptr->base_class_offset, ptr->flags,
type_descriptor, dbgstr_type_info(type_descriptor), h );
TRACE( " hierarchy: sig=%08x attr=%08x len=%d base classes=%p\n",
h->signature, h->attributes, h->array_len, base + h->base_classes );
for (i = 0; i < h->array_len; i++)
{
const rtti_base_descriptor_x64 *bases = (rtti_base_descriptor_x64*)(base +
((const rtti_base_array_x64*)(base + h->base_classes))->bases[i]);
TRACE( " base class %p: num %d off %d,%d,%d attr %08x type %p %s\n",
bases,
bases->num_base_classes,
bases->offsets.this_offset,
bases->offsets.vbase_descr,
bases->offsets.vbase_offset,
bases->attributes,
base + bases->type_descriptor,
dbgstr_type_info((const type_info*)(base + bases->type_descriptor)) );
}
}
#endif
/* Internal common ctor for exception */
static void EXCEPTION_ctor(exception *_this, const char** name)
{
@ -919,6 +950,7 @@ const type_info* CDECL MSVCRT___RTtypeid(void *cppobj)
* This function is usually called by compiler generated code as a result
* of using one of the C++ dynamic cast statements.
*/
#ifndef __x86_64__
void* CDECL MSVCRT___RTDynamicCast(void *cppobj, int unknown,
type_info *src, type_info *dst,
int do_throw)
@ -982,6 +1014,87 @@ void* CDECL MSVCRT___RTDynamicCast(void *cppobj, int unknown,
return ret;
}
#else
void* CDECL MSVCRT___RTDynamicCast(void *cppobj, int unknown,
type_info *src, type_info *dst,
int do_throw)
{
void *ret;
if (!cppobj) return NULL;
TRACE("obj: %p unknown: %d src: %p %s dst: %p %s do_throw: %d)\n",
cppobj, unknown, src, dbgstr_type_info(src), dst, dbgstr_type_info(dst), do_throw);
__TRY
{
int i;
const rtti_object_locator *obj_locator = get_obj_locator( cppobj );
if(obj_locator->signature == 0)
{
const rtti_object_hierarchy *obj_bases = obj_locator->type_hierarchy;
const rtti_base_descriptor * const* base_desc = obj_bases->base_classes->bases;
if (TRACE_ON(msvcrt)) dump_obj_locator(obj_locator);
ret = NULL;
for (i = 0; i < obj_bases->array_len; i++)
{
const type_info *typ = base_desc[i]->type_descriptor;
if (!strcmp(typ->mangled, dst->mangled))
{
void *this_ptr = (char *)cppobj - obj_locator->base_class_offset;
ret = get_this_pointer( &base_desc[i]->offsets, this_ptr );
break;
}
}
}
else
{
const rtti_object_locator_x64 *obj_locator_x64 = (const rtti_object_locator_x64*)obj_locator;
const char *base = (const char*)obj_locator_x64 - obj_locator_x64->object_locator;
const rtti_object_hierarchy_x64 *obj_bases = (const rtti_object_hierarchy_x64*)(base + obj_locator_x64->type_hierarchy);
const rtti_base_array_x64 *base_array = (const rtti_base_array_x64*)(base + obj_bases->base_classes);
if (TRACE_ON(msvcrt)) dump_obj_locator_x64(obj_locator_x64);
ret = NULL;
for (i = 0; i < obj_bases->array_len; i++)
{
const rtti_base_descriptor_x64 *base_desc = (const rtti_base_descriptor_x64*)(base + base_array->bases[i]);
const type_info *typ = (const type_info*)(base + base_desc->type_descriptor);
if (!strcmp(typ->mangled, dst->mangled))
{
void *this_ptr = (char *)cppobj - obj_locator_x64->base_class_offset;
ret = get_this_pointer( &base_desc->offsets, this_ptr );
break;
}
}
}
if (!ret && do_throw)
{
const char *msg = "Bad dynamic_cast!";
bad_cast e;
MSVCRT_bad_cast_ctor( &e, &msg );
_CxxThrowException( &e, &bad_cast_exception_type );
}
}
__EXCEPT_PAGE_FAULT
{
__non_rtti_object e;
MSVCRT___non_rtti_object_ctor( &e, "Access violation - no RTTI data!" );
_CxxThrowException( &e, &bad_typeid_exception_type );
return NULL;
}
__ENDTRY
return ret;
}
#endif
/******************************************************************
* __RTCastToVoid (MSVCRT.@)

27
dlls/msvcrt/tests/cpp.c
View File

@ -881,9 +881,17 @@ static void test_rtti(void)
{ {RTTI_REF(simple_class_rtti, base_descriptor[0])} },
{0, 0, 1, RTTI_REF(simple_class_rtti, base_array)},
{RTTI_SIGNATURE, 0, 0, RTTI_REF(simple_class_rtti, type_info[0]), RTTI_REF(simple_class_rtti, object_hierarchy), RTTI_REF(simple_class_rtti, object_locator)}
}, child_class_rtti = {
{ {NULL, NULL, "simple_class"}, {NULL, NULL, "child_class"} },
{ {RTTI_REF(child_class_rtti, type_info[1]), 0, {4, -1, 0}, 0}, {RTTI_REF(child_class_rtti, type_info[0]), 0, {8, -1, 0}, 0} },
{ {RTTI_REF(child_class_rtti, base_descriptor[0]), RTTI_REF(child_class_rtti, base_descriptor[1])} },
{0, 0, 2, RTTI_REF(child_class_rtti, base_array)},
{RTTI_SIGNATURE, 0, 0, RTTI_REF(child_class_rtti, type_info[1]), RTTI_REF(child_class_rtti, object_hierarchy), RTTI_REF(child_class_rtti, object_locator)}
};
void *simple_class_vtbl[2] = {&simple_class_rtti.object_locator};
void *simple_class = &simple_class_vtbl[1];
void *child_class_vtbl[2] = {&child_class_rtti.object_locator};
void *child_class = &child_class_vtbl[1];
static const char* e_name = "name";
type_info *ti,*bti;
@ -923,6 +931,25 @@ static void test_rtti(void)
ti = p__RTtypeid(&simple_class);
ok (ti && ti->mangled && !strcmp(ti->mangled, "simple_class"),
"incorrect rtti data\n");
casted = p__RTCastToVoid(&simple_class);
ok (casted == (void*)&simple_class, "failed cast to void\n");
ti = p__RTtypeid(&child_class);
ok (ti && ti->mangled && !strcmp(ti->mangled, "child_class"),
"incorrect rtti data\n");
casted = p__RTCastToVoid(&child_class);
ok (casted == (void*)&child_class, "failed cast to void\n");
casted = p__RTDynamicCast(&child_class, 0, NULL, simple_class_rtti.type_info, 0);
if(casted)
{
ok (casted == (char*)&child_class+8, "failed cast to simple_class (%p %p)\n", casted, &child_class);
}
casted = p__RTDynamicCast(&child_class, 0, &child_class_rtti.type_info[0], &child_class_rtti.type_info[1], 0);
ok(casted == (char*)&child_class+4, "failed cast to child class (%p %p)\n", casted, &child_class);
}
struct _demangle {