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diff --git a/Source/JavaScriptCore/API/JSCallbackConstructor.cpp b/Source/JavaScriptCore/API/JSCallbackConstructor.cpp
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+++ b/Source/JavaScriptCore/API/JSCallbackConstructor.cpp
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+/*
+ * Copyright (C) 2006, 2007, 2008 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "JSCallbackConstructor.h"
+
+#include "APIShims.h"
+#include "APICast.h"
+#include <runtime/Error.h>
+#include <runtime/JSGlobalObject.h>
+#include <runtime/JSLock.h>
+#include <runtime/ObjectPrototype.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+const ClassInfo JSCallbackConstructor::info = { "CallbackConstructor", 0, 0, 0 };
+
+JSCallbackConstructor::JSCallbackConstructor(JSGlobalObject* globalObject, NonNullPassRefPtr<Structure> structure, JSClassRef jsClass, JSObjectCallAsConstructorCallback callback)
+    : JSObjectWithGlobalObject(globalObject, structure)
+    , m_class(jsClass)
+    , m_callback(callback)
+{
+    if (m_class)
+        JSClassRetain(jsClass);
+}
+
+JSCallbackConstructor::~JSCallbackConstructor()
+{
+    if (m_class)
+        JSClassRelease(m_class);
+}
+
+static EncodedJSValue JSC_HOST_CALL constructJSCallback(ExecState* exec)
+{
+    JSObject* constructor = exec->callee();
+    JSContextRef ctx = toRef(exec);
+    JSObjectRef constructorRef = toRef(constructor);
+
+    JSObjectCallAsConstructorCallback callback = static_cast<JSCallbackConstructor*>(constructor)->callback();
+    if (callback) {
+        int argumentCount = static_cast<int>(exec->argumentCount());
+        Vector<JSValueRef, 16> arguments(argumentCount);
+        for (int i = 0; i < argumentCount; i++)
+            arguments[i] = toRef(exec, exec->argument(i));
+
+        JSValueRef exception = 0;
+        JSObjectRef result;
+        {
+            APICallbackShim callbackShim(exec);
+            result = callback(ctx, constructorRef, argumentCount, arguments.data(), &exception);
+        }
+        if (exception)
+            throwError(exec, toJS(exec, exception));
+        return JSValue::encode(toJS(result));
+    }
+    
+    return JSValue::encode(toJS(JSObjectMake(ctx, static_cast<JSCallbackConstructor*>(constructor)->classRef(), 0)));
+}
+
+ConstructType JSCallbackConstructor::getConstructData(ConstructData& constructData)
+{
+    constructData.native.function = constructJSCallback;
+    return ConstructTypeHost;
+}
+
+} // namespace JSC