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authorPaolo Bonzini <pbonzini@redhat.com>2013-05-10 14:16:37 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2013-05-13 09:52:06 -0500
commit793c96b5403233fd9935c94b2af6d557c297a088 (patch)
tree544971a075a681f2c58b13097871ac54d77d74b5
parentbf0fda346694db1eddecff1d74ff9f4d5eba3461 (diff)
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qom: add a fast path to object_class_dynamic_cast
For leaf classes, in many cases the callbacks will simply downcast the object back to the original class. Add this fast path to object_class_dynamic_cast, object_dynamic_cast will inherit it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1368188203-3407-4-git-send-email-pbonzini@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
-rw-r--r--qom/object.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/qom/object.c b/qom/object.c
index 35f4694..0aa0c07 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -457,7 +457,12 @@ ObjectClass *object_class_dynamic_cast(ObjectClass *class,
return NULL;
}
+ /* A simple fast path that can trigger a lot for leaf classes. */
type = class->type;
+ if (type->name == typename) {
+ return class;
+ }
+
target_type = type_get_by_name(typename);
if (!target_type) {
/* target class type unknown, so fail the cast */