Start adding support for elements to the LookupIterator

src/elements.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ELEMENTS_H_
 #define V8_ELEMENTS_H_
 
 #include "src/elements-kind.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 164 matching lines @@
     return elements_accessors_[elements_kind];
   }
 
   static ElementsAccessor* ForArray(Handle<FixedArrayBase> array);
 
   static void InitializeOncePerProcess();
   static void TearDown();
 
  protected:
   friend class SloppyArgumentsElementsAccessor;
+  friend class LookupIterator;
 
-  virtual uint32_t GetCapacity(Handle<JSObject> holder,
-                               Handle<FixedArrayBase> backing_store) = 0;
+  static ElementsAccessor* ForArray(FixedArrayBase* array);
+
+  virtual uint32_t GetCapacity(JSObject* holder,
+                               FixedArrayBase* backing_store) = 0;
 
   // 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 and
   // GetCapacity.  Keys refer to elements in terms of the value that would be
   // 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(Handle<FixedArrayBase> backing_store,
+  virtual uint32_t GetKeyForIndex(FixedArrayBase* backing_store,
                                   uint32_t index) = 0;
+  virtual uint32_t GetIndexForKey(FixedArrayBase* backing_store,
+                                  uint32_t key) = 0;
+  virtual PropertyDetails GetDetails(FixedArrayBase* backing_store,
+                                     uint32_t index) = 0;
 
  private:
   static ElementsAccessor** elements_accessors_;
   const char* name_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
 };
 
 void CheckArrayAbuse(Handle<JSObject> obj, const char* op, uint32_t key,
                      bool allow_appending = false);
 
 MUST_USE_RESULT MaybeHandle<Object> ArrayConstructInitializeElements(
     Handle<JSArray> array,
     Arguments* args);
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_