api: Object::CachedProperty

src/property.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 189 matching lines @@
     isolate->SetTopLookupResult(this);
   }
 
   ~LookupResult() {
     ASSERT(isolate()->top_lookup_result() == this);
     isolate()->SetTopLookupResult(next_);
   }
 
   Isolate* isolate() const { return isolate_; }
 
+  void CopyFrom(LookupResult* res, JSObject* new_holder) {
+    isolate_ = res->isolate_;
+    lookup_type_ = res->lookup_type_;
+    number_ = res->number_;
+    cacheable_ = res->cacheable_;
+    details_ = res->details_;
+    holder_ = new_holder;
+  }
+
   void DescriptorResult(JSObject* holder, PropertyDetails details, int number) {
     lookup_type_ = DESCRIPTOR_TYPE;
     holder_ = holder;
     details_ = details;
     number_ = number;
   }
 
   bool CanHoldValue(Handle<Object> value) {
     return value->FitsRepresentation(details_.representation());
   }
@@ skipping 248 matching lines @@
   }
 
   Object* GetValueFromMap(Map* map) const {
     ASSERT(lookup_type_ == DESCRIPTOR_TYPE);
     ASSERT(number_ < map->NumberOfOwnDescriptors());
     return map->instance_descriptors()->GetValue(number_);
   }
 
   void Iterate(ObjectVisitor* visitor);
 
- private:
+ protected:
   Isolate* isolate_;
   LookupResult* next_;
 
   // Where did we find the result;
   enum {
     NOT_FOUND,
     DESCRIPTOR_TYPE,
     TRANSITION_TYPE,
     DICTIONARY_TYPE,
     HANDLER_TYPE,
     INTERCEPTOR_TYPE
   } lookup_type_;
 
   JSReceiver* holder_;
   int number_;
   bool cacheable_;
   PropertyDetails details_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROPERTY_H_