Changeset 36401 in webkit for trunk/JavaScriptCore/kjs/PutPropertySlot.h

Timestamp:

Sep 14, 2008, 1:18:49 AM (17 years ago)

Author:

[email protected]

Message:

Bug 20821: Cache property transitions to speed up object initialization
​https://bugs.webkit.org/show_bug.cgi?id=20821

Reviewed by Cameron Zwarich.

Implement a transition cache to improve the performance of new properties
being added to objects. This is extremely beneficial in constructors and
shows up as a 34% improvement on access-binary-trees in SunSpider (0.8%
overall)

File:

• trunk/JavaScriptCore/kjs/PutPropertySlot.h (modified) (2 diffs)

trunk/JavaScriptCore/kjs/PutPropertySlot.h

@@ -41 +41 @@
             : m_type(Invalid)
             , m_base(0)
+            , m_wasTransition(false)
         {
         }
@@ -66 +67 @@
             return m_offset;
         }
-
+        
+        bool wasTransition() const { return m_wasTransition; }
+        void setWasTransition(bool wasTransition) { m_wasTransition = wasTransition; }
     private:
         Type m_type;
         JSObject* m_base;
+        bool m_wasTransition;
         size_t m_offset;
     };