--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/ScriptInstance.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2008, 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
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ScriptInstance.h"
+
+#ifndef NDEBUG
+#include "V8Proxy.h"
+#endif
+#include <wtf/Assertions.h>
+
+namespace WebCore {
+
+V8ScriptInstance::V8ScriptInstance()
+{
+}
+
+V8ScriptInstance::V8ScriptInstance(v8::Handle<v8::Object> instance)
+{
+    set(instance);
+}
+
+V8ScriptInstance::~V8ScriptInstance()
+{
+    clear();
+}
+
+v8::Persistent<v8::Object> V8ScriptInstance::instance()
+{
+    return m_instance;
+}
+
+void V8ScriptInstance::clear()
+{
+    if (m_instance.IsEmpty())
+        return;
+#ifndef NDEBUG
+    V8GCController::unregisterGlobalHandle(this, m_instance);
+#endif
+    m_instance.Dispose();
+    m_instance.Clear();
+}
+
+void V8ScriptInstance::set(v8::Handle<v8::Object> instance)
+{
+    clear();
+    if (instance.IsEmpty())
+        return;
+
+    m_instance = v8::Persistent<v8::Object>::New(instance);
+#ifndef NDEBUG
+    V8GCController::registerGlobalHandle(SCRIPTINSTANCE, this, m_instance);
+#endif
+}
+
+} // namespace WebCore