Fixed global object leak

src/objects.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 7400 matching lines @@
 
 class JSGlobalProxy : public JSObject {
  public:
   // [native_context]: the owner native context of this global proxy object.
   // It is null value if this object is not used by any context.
   DECL_ACCESSORS(native_context, Object)
 
   // Casting.
   static inline JSGlobalProxy* cast(Object* obj);
 
+  bool IsDetached() { return GetPrototype()->IsNull(); }
+
   // Dispatched behavior.
   DECLARE_PRINTER(JSGlobalProxy)
   DECLARE_VERIFIER(JSGlobalProxy)
 
   // Layout description.
   static const int kNativeContextOffset = JSObject::kHeaderSize;
   static const int kSize = kNativeContextOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalProxy);
@@ skipping 49 matching lines @@
 // JavaScript global object.
 class JSGlobalObject: public GlobalObject {
  public:
   // Casting.
   static inline JSGlobalObject* cast(Object* obj);
 
   // Ensure that the global object has a cell for the given property name.
   static Handle<PropertyCell> EnsurePropertyCell(Handle<JSGlobalObject> global,
                                                  Handle<Name> name);
 
+  bool IsDetached() {
+    return JSGlobalProxy::cast(global_receiver())->IsDetached();
+  }
+
   // Dispatched behavior.
   DECLARE_PRINTER(JSGlobalObject)
   DECLARE_VERIFIER(JSGlobalObject)
 
   // Layout description.
   static const int kSize = GlobalObject::kHeaderSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalObject);
 };
@@ skipping 3112 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_