Revision: 21718
Author: [email protected]
Date: Fri Jun 6 13:33:27 2014 UTC
Log: Simplify prototype chain walk in hydrogen
Since we know that we're only encountering JSObjects, we can use the
faster GetPrototype() method to walk up the chain
BUG=none
[email protected]
LOG=n
Review URL: https://codereview.chromium.org/321543002
http://code.google.com/p/v8/source/detail?r=21718
Modified:
/branches/bleeding_edge/src/hydrogen.cc
=======================================
--- /branches/bleeding_edge/src/hydrogen.cc Thu Jun 5 07:33:01 2014 UTC
+++ /branches/bleeding_edge/src/hydrogen.cc Fri Jun 6 13:33:27 2014 UTC
@@ -6558,11 +6558,10 @@
// changes could allow callbacks on elements in the chain that
// aren't compatible with monomorphic keyed stores.
Handle<JSObject> prototype(JSObject::cast(map->prototype()));
- Object* holder = map->prototype();
- while (holder->GetPrototype(isolate())->IsJSObject()) {
- holder = holder->GetPrototype(isolate());
+ JSObject* holder = JSObject::cast(map->prototype());
+ while (!holder->GetPrototype()->IsNull()) {
+ holder = JSObject::cast(holder->GetPrototype());
}
- ASSERT(holder->GetPrototype(isolate())->IsNull());
BuildCheckPrototypeMaps(prototype,
Handle<JSObject>(JSObject::cast(holder)));
--
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