Commit 793c96b5 authored May 10, 2013 by Paolo Bonzini Committed by Anthony Liguori May 13, 2013

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>

parent bf0fda34

qom/object.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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 */