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qom: avoid useless conversions from string to type 

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-02-03 11:51:39 +01:00
parent acc4af3fec
commit 9970bd887d
1 changed files with 12 additions and 15 deletions
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27
qom/object.c
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@ -63,6 +63,8 @@ typedef struct Interface
#define INTERFACE(obj) OBJECT_CHECK(Interface, obj, TYPE_INTERFACE)
static Type type_interface;
static GHashTable *type_table_get(void)
{
static GHashTable *type_table;
@ -384,25 +386,20 @@ static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
return false;
}
static bool object_is_type(Object *obj, const char *typename)
static bool object_is_type(Object *obj, TypeImpl *target_type)
{
TypeImpl *target_type;
if (typename == TYPE_OBJECT) {
return true;
}
target_type = type_get_by_name(typename);
return type_is_ancestor(obj->class->type, target_type);
return !target_type || type_is_ancestor(obj->class->type, target_type);
}
Object *object_dynamic_cast(Object *obj, const char *typename)
{
TypeImpl *target_type = type_get_by_name(typename);
GSList *i;
/* Check if typename is a direct ancestor. Special-case TYPE_OBJECT,
* we want to go back from interfaces to the parent.
*/
if (typename && object_is_type(obj, typename)) {
if (target_type && object_is_type(obj, target_type)) {
return obj;
}
@ -410,21 +407,21 @@ Object *object_dynamic_cast(Object *obj, const char *typename)
* ancestor of typename. In principle we could do this test at the very
* beginning of object_dynamic_cast, avoiding a second call to
* object_is_type. However, casting between interfaces is relatively
* rare, and object_is_type(obj, TYPE_INTERFACE) would fail almost always.
* rare, and object_is_type(obj, type_interface) would fail almost always.
*
* Perhaps we could add a magic value to the object header for increased
* (run-time) type safety and to speed up tests like this one. If we ever
* do that we can revisit the order here.
*/
if (object_is_type(obj, TYPE_INTERFACE)) {
if (object_is_type(obj, type_interface)) {
assert(!obj->interfaces);
obj = INTERFACE(obj)->obj;
if (object_is_type(obj, typename)) {
if (object_is_type(obj, target_type)) {
return obj;
}
}
if (typename == TYPE_OBJECT) {
if (!target_type) {
return obj;
}
@ -432,7 +429,7 @@ Object *object_dynamic_cast(Object *obj, const char *typename)
for (i = obj->interfaces; i; i = i->next) {
Interface *iface = i->data;
if (object_is_type(OBJECT(iface), typename)) {
if (object_is_type(OBJECT(iface), target_type)) {
return OBJECT(iface);
}
}
@ -449,7 +446,7 @@ static void register_interface(void)
.abstract = true,
};
type_register_static(&interface_info);
type_interface = type_register_static(&interface_info);
}
device_init(register_interface);