bindings: Introduces type-check for the internal pointers.

Source/bindings/core/v8/V8GCController.cpp

 /*
  * Copyright (C) 2009 Google Inc. 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
@@ skipping 247 matching lines @@
         // Casting to a Handle is safe here, since the Persistent doesn't get GCd
         // during the GC prologue.
         ASSERT((*reinterpret_cast<v8::Handle<v8::Value>*>(value))->IsObject());
         v8::Handle<v8::Object>* wrapper = reinterpret_cast<v8::Handle<v8::Object>*>(value);
         ASSERT(V8DOMWrapper::isDOMWrapper(*wrapper));
 
         if (value->IsIndependent())
             return;
 
         const WrapperTypeInfo* type = toWrapperTypeInfo(*wrapper);
-        void* object = toNative(*wrapper);
 
         ActiveDOMObject* activeDOMObject = type->toActiveDOMObject(*wrapper);
         if (activeDOMObject && activeDOMObject->hasPendingActivity())
             m_isolate->SetObjectGroupId(*value, liveRootId());
 
         if (classId == v8DOMNodeClassId) {
             ASSERT(V8Node::hasInstance(*wrapper, m_isolate));
-            Node* node = static_cast<Node*>(object);
+            Node* node = V8Node::toNative(*wrapper);
             if (node->hasEventListeners())
                 addReferencesForNodeWithEventListeners(m_isolate, node, v8::Persistent<v8::Object>::Cast(*value));
             Node* root = V8GCController::opaqueRootForGC(node, m_isolate);
             m_isolate->SetObjectGroupId(*value, v8::UniqueId(reinterpret_cast<intptr_t>(root)));
             if (m_constructRetainedObjectInfos)
                 m_groupsWhichNeedRetainerInfo.append(root);
         } else if (classId == v8DOMObjectClassId) {
-            type->visitDOMWrapper(object, v8::Persistent<v8::Object>::Cast(*value), m_isolate);
+            type->visitDOMWrapper(toInternalPointer(*wrapper), v8::Persistent<v8::Object>::Cast(*value), m_isolate);
         } else {
             ASSERT_NOT_REACHED();
         }
     }
 
     void notifyFinished()
     {
         if (!m_constructRetainedObjectInfos)
             return;
         std::sort(m_groupsWhichNeedRetainerInfo.begin(), m_groupsWhichNeedRetainerInfo.end());
@@ skipping 154 matching lines @@
     static size_t lastUsageReportedToV8 = 0;
 
     size_t currentUsage = Partitions::currentDOMMemoryUsage();
     int64_t diff = static_cast<int64_t>(currentUsage) - static_cast<int64_t>(lastUsageReportedToV8);
     isolate->AdjustAmountOfExternalAllocatedMemory(diff);
 
     lastUsageReportedToV8 = currentUsage;
 }
 
 } // namespace blink