Transforming PersistentHandleVisitor to not need to copy Persistent handles.

include/v8.h

 // Copyright 2012 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 210 matching lines @@
 
 // --- Handles ---
 
 #define TYPE_CHECK(T, S)                                       \
   while (false) {                                              \
     *(static_cast<T* volatile*>(0)) = static_cast<S*>(0);      \
   }
 
 
 #define V8_USE_UNSAFE_HANDLES
+#define V8_USE_OLD_STYLE_PERSISTENT_HANDLE_VISITORS
 
 /**
  * An object reference managed by the v8 garbage collector.
  *
  * All objects returned from v8 have to be tracked by the garbage
  * collector so that it knows that the objects are still alive.  Also,
  * because the garbage collector may move objects, it is unsafe to
  * point directly to an object.  Instead, all objects are stored in
  * handles which are known by the garbage collector and updated
  * whenever an object moves.  Handles should always be passed by value
@@ skipping 3859 matching lines @@
   virtual void VisitExternalString(Handle<String> string) {}
 };
 
 
 /**
  * Interface for iterating through all the persistent handles in the heap.
  */
 class V8EXPORT PersistentHandleVisitor {  // NOLINT
  public:
   virtual ~PersistentHandleVisitor() {}
+#ifdef V8_USE_OLD_STYLE_PERSISTENT_HANDLE_VISITORS
   virtual void VisitPersistentHandle(Persistent<Value> value,
                                      uint16_t class_id) {}
+#else
+  virtual void VisitPersistentHandle(Persistent<Value>* value,
+                                     uint16_t class_id) {}
+#endif
 };
 
 
 /**
  * Asserts that no action is performed that could cause a handle's value
  * to be modified. Useful when otherwise unsafe handle operations need to
  * be performed.
  */
 class V8EXPORT AssertNoGCScope {
 #ifndef DEBUG
@@ skipping 2221 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_