Refactoring: move HasElementAtKey to ElementsAccessor

src/elements.h

 // Copyright 2011 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 30 matching lines @@
   virtual ~ElementsAccessor() { }
   virtual MaybeObject* Get(FixedArrayBase* backing_store,
                            uint32_t key,
                            JSObject* holder,
                            Object* receiver) = 0;
 
   virtual MaybeObject* Delete(JSObject* holder,
                               uint32_t key,
                               JSReceiver::DeleteMode mode) = 0;
 
+  virtual bool HasElementAtKey(FixedArrayBase* backing_store,
+                               uint32_t key,
+                               JSObject* holder,
+                               Object* receiver) = 0;
+
   virtual MaybeObject* AddElementsToFixedArray(FixedArrayBase* from,
                                                FixedArray* to,
                                                JSObject* holder,
                                                Object* receiver) = 0;
 
   // Returns a shared ElementsAccessor for the specified ElementsKind.
   static ElementsAccessor* ForKind(ElementsKind elements_kind) {
     ASSERT(elements_kind < kElementsKindCount);
     return elements_accessors_[elements_kind];
   }
 
   static ElementsAccessor* ForArray(FixedArrayBase* array);
 
   static void InitializeOncePerProcess();
 
  protected:
   friend class NonStrictArgumentsElementsAccessor;
 
   virtual uint32_t GetCapacity(FixedArrayBase* backing_store) = 0;
 
   virtual bool HasElementAtIndex(FixedArrayBase* backing_store,
                                  uint32_t index,
                                  JSObject* holder,
                                  Object* receiver) = 0;
 
-  // Element handlers distinguish between indexes and keys when the manipulate
+  // Element handlers distinguish between indexes and keys when they manipulate
   // elements.  Indexes refer to elements in terms of their location in the
-  // underlying storage's backing store representation, and are between 0
+  // underlying storage's backing store representation, and are between 0 and
   // GetCapacity.  Keys refer to elements in terms of the value that would be
-  // specific in JavaScript to access the element. In most implementations, keys
-  // are equivalent to indexes, and GetKeyForIndex returns the same value it is
-  // passed. In the NumberDictionary ElementsAccessor, GetKeyForIndex maps the
-  // index to a key using the KeyAt method on the NumberDictionary.
+  // specified in JavaScript to access the element. In most implementations,
+  // keys are equivalent to indexes, and GetKeyForIndex returns the same value
+  // it is passed. In the NumberDictionary ElementsAccessor, GetKeyForIndex maps
+  // the index to a key using the KeyAt method on the NumberDictionary.
   virtual uint32_t GetKeyForIndex(FixedArrayBase* backing_store,
                                   uint32_t index) = 0;
 
  private:
   static ElementsAccessor** elements_accessors_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_