Use function wrapper argument to expose internal arrays to native scripts.

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 1676 matching lines @@
       Handle<JSReceiver> object,
       KeyCollectionType type);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSReceiver);
 };
 
 // Forward declaration for JSObject::GetOrCreateHiddenPropertiesHashTable.
 class ObjectHashTable;
 
-// Forward declaration for JSObject::Copy.
-class AllocationSite;
-
 
 // The JSObject describes real heap allocated JavaScript objects with
 // properties.
 // Note that the map of JSObject changes during execution to enable inline
 // caching.
 class JSObject: public JSReceiver {
  public:
   // [properties]: Backing storage for properties.
   // properties is a FixedArray in the fast case and a Dictionary in the
   // slow case.
@@ skipping 16 matching lines @@
   // the elements array may be shared by a few objects and so before
   // writing to any element the array must be copied. Use
   // EnsureWritableFastElements in this case.
   //
   // In the slow mode the elements is either a NumberDictionary, an
   // ExternalArray, or a FixedArray parameter map for a (sloppy)
   // arguments object.
   DECL_ACCESSORS(elements, FixedArrayBase)
   inline void initialize_elements();
   static void ResetElements(Handle<JSObject> object);
+  static void ResetProperties(Handle<JSObject> object);

[Jakob Kummerow, 2015/05/11 15:25:26]

I see no implementation and no callers of this.

   static inline void SetMapAndElements(Handle<JSObject> object,
                                        Handle<Map> map,
                                        Handle<FixedArrayBase> elements);
   inline ElementsKind GetElementsKind();
   inline ElementsAccessor* GetElementsAccessor();
   // Returns true if an object has elements of FAST_SMI_ELEMENTS ElementsKind.
   inline bool HasFastSmiElements();
   // Returns true if an object has elements of FAST_ELEMENTS ElementsKind.
   inline bool HasFastObjectElements();
   // Returns true if an object has elements of FAST_ELEMENTS or
@@ skipping 404 matching lines @@
 
   // ES5 Object.freeze
   MUST_USE_RESULT static MaybeHandle<Object> Freeze(Handle<JSObject> object);
 
   // Called the first time an object is observed with ES7 Object.observe.
   static void SetObserved(Handle<JSObject> object);
 
   // Copy object.
   enum DeepCopyHints { kNoHints = 0, kObjectIsShallow = 1 };
 
-  static Handle<JSObject> Copy(Handle<JSObject> object);
   MUST_USE_RESULT static MaybeHandle<JSObject> DeepCopy(
       Handle<JSObject> object,
       AllocationSiteUsageContext* site_context,
       DeepCopyHints hints = kNoHints);
   MUST_USE_RESULT static MaybeHandle<JSObject> DeepWalk(
       Handle<JSObject> object,
       AllocationSiteCreationContext* site_context);
 
   static Handle<Object> GetDataProperty(Handle<JSObject> object,
                                         Handle<Name> key);
@@ skipping 8930 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_