Changeset 37321 in webkit for trunk/JavaScriptCore/kjs/StructureID.h

Timestamp:

Oct 5, 2008, 5:58:42 PM (17 years ago)

Author:

[email protected]

Message:

2008-10-05 Sam Weinig <​[email protected]>

Reviewed by Maciej Stachowiak.

Avoid an extra lookup when transitioning to an existing StructureID
by caching the offset of property that caused the transition.

1% win on V8 suite. Wash on SunSpider.

• kjs/PropertyMap.cpp: (JSC::PropertyMap::put):
• kjs/PropertyMap.h:
• kjs/StructureID.cpp: (JSC::StructureID::StructureID): (JSC::StructureID::addPropertyTransition):
• kjs/StructureID.h: (JSC::StructureID::setCachedTransistionOffset): (JSC::StructureID::cachedTransistionOffset):

File:

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

trunk/JavaScriptCore/kjs/StructureID.h

@@ -116 +116 @@
         PropertyMap& propertyMap() { return m_propertyMap; }
 
+        void setCachedTransistionOffset(size_t offset) { m_cachedTransistionOffset = offset; }
+        size_t cachedTransistionOffset() const { return m_cachedTransistionOffset; }
+
         void getEnumerablePropertyNames(ExecState*, PropertyNameArray&, JSObject*);
         void clearEnumerationCache();
@@ -146 +149 @@
 
         PropertyMap m_propertyMap;
+
+        size_t m_cachedTransistionOffset;
     };