1 files changed, 15 insertions, 1 deletions
diff --git a/Source/JavaScriptCore/runtime/PropertyNameArray.h b/Source/JavaScriptCore/runtime/PropertyNameArray.h
index 30f439bb2..1cdac0049 100644
--- a/Source/JavaScriptCore/runtime/PropertyNameArray.h
+++ b/Source/JavaScriptCore/runtime/PropertyNameArray.h
@@ -56,6 +56,7 @@ namespace JSC {
             : m_data(PropertyNameArrayData::create())
             , m_globalData(globalData)
             , m_numCacheableSlots(0)
+            , m_baseObject(0)
         {
         }
 
@@ -63,6 +64,7 @@ namespace JSC {
             : m_data(PropertyNameArrayData::create())
             , m_globalData(&exec->globalData())
             , m_numCacheableSlots(0)
+            , m_baseObject(0)
         {
         }
 
@@ -86,7 +88,18 @@ namespace JSC {
         const_iterator end() const { return m_data->propertyNameVector().end(); }
 
         size_t numCacheableSlots() const { return m_numCacheableSlots; }
-        void setNumCacheableSlots(size_t numCacheableSlots) { m_numCacheableSlots = numCacheableSlots; }
+        void setNumCacheableSlotsForObject(JSObject* object, size_t numCacheableSlots)
+        {
+            if (object != m_baseObject)
+                return;
+            m_numCacheableSlots = numCacheableSlots;
+        }
+        void setBaseObject(JSObject* object)
+        {
+            if (m_baseObject)
+                return;
+            m_baseObject = object;
+        }
 
     private:
         typedef HashSet<StringImpl*, PtrHash<StringImpl*> > IdentifierSet;
@@ -95,6 +108,7 @@ namespace JSC {
         IdentifierSet m_set;
         JSGlobalData* m_globalData;
         size_t m_numCacheableSlots;
+        JSObject* m_baseObject;
     };
 
 } // namespace JSC