NewGC: Merge bleeding edge up to 9009.

src/elements.h

Index: src/elements.h
===================================================================
--- src/elements.h	(revision 9006)
+++ src/elements.h	(working copy)
@@ -39,22 +39,51 @@
  public:
   ElementsAccessor() { }
   virtual ~ElementsAccessor() { }
-  virtual MaybeObject* GetWithReceiver(JSObject* obj,
-                                       Object* receiver,
-                                       uint32_t index) = 0;
+  virtual MaybeObject* Get(FixedArrayBase* backing_store,
+                           uint32_t key,
+                           JSObject* holder,
+                           Object* receiver) = 0;
 
-  virtual MaybeObject* Delete(JSObject* obj,
-                              uint32_t index,
+  virtual MaybeObject* Delete(JSObject* holder,
+                              uint32_t key,
                               JSReceiver::DeleteMode mode) = 0;
 
+  virtual MaybeObject* AddElementsToFixedArray(FixedArrayBase* from,
+                                               FixedArray* to,
+                                               JSObject* holder,
+                                               Object* receiver) = 0;
+
   // Returns a shared ElementsAccessor for the specified ElementsKind.
   static ElementsAccessor* ForKind(JSObject::ElementsKind elements_kind) {
     ASSERT(elements_kind < JSObject::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
+  // elements.  Indexes refer to elements in terms of their location in the
+  // underlying storage's backing store representation, and are between 0
+  // 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.
+  virtual uint32_t GetKeyForIndex(FixedArrayBase* backing_store,
+                                  uint32_t index) = 0;
+
  private:
   static ElementsAccessor** elements_accessors_;