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[Qemu-devel] [PATCH for-1.5 3/9] qom: add a fast path to object_class_dy
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH for-1.5 3/9] qom: add a fast path to object_class_dynamic_cast |
Date: |
Fri, 10 May 2013 14:16:37 +0200 |
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 <address@hidden>
---
qom/object.c | 5 +++++
1 file changed, 5 insertions(+)
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 */
--
1.8.1.4
- [Qemu-devel] [PATCH for-1.5 0/9] Disable expensive QOM cast debugging for official releases, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 1/9] qom: improve documentation of cast functions, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 2/9] qom: allow casting of a NULL class, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 3/9] qom: add a fast path to object_class_dynamic_cast,
Paolo Bonzini <=
- [Qemu-devel] [PATCH for-1.5 4/9] qom: pass file/line/function to asserting casts, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 5/9] qom: trace asserting casts, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 7/9] build: disable QOM cast debugging for official releases, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 6/9] qom: allow turning cast debugging off, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 8/9] qom: simplify object_class_dynamic_cast, part 1, Paolo Bonzini, 2013/05/10
- [Qemu-devel] [PATCH for-1.5 9/9] qom: simplify object_class_dynamic_cast, part 2, Paolo Bonzini, 2013/05/10
- Re: [Qemu-devel] [PATCH for-1.5 0/9] Disable expensive QOM cast debugging for official releases, Anthony Liguori, 2013/05/10