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diff --git a/Source/JavaScriptCore/runtime/JSPromiseDeferred.cpp b/Source/JavaScriptCore/runtime/JSPromiseDeferred.cpp
new file mode 100644
index 000000000..ba7697344
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+++ b/Source/JavaScriptCore/runtime/JSPromiseDeferred.cpp
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+/*
+ * Copyright (C) 2013 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 INC. AND ITS 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 APPLE INC. OR ITS 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 "JSPromiseDeferred.h"
+
+#include "BuiltinNames.h"
+#include "Error.h"
+#include "Exception.h"
+#include "JSCJSValueInlines.h"
+#include "JSCellInlines.h"
+#include "JSPromise.h"
+#include "JSPromiseConstructor.h"
+#include "SlotVisitorInlines.h"
+#include "StructureInlines.h"
+
+namespace JSC {
+
+const ClassInfo JSPromiseDeferred::s_info = { "JSPromiseDeferred", 0, 0, CREATE_METHOD_TABLE(JSPromiseDeferred) };
+
+JSValue newPromiseCapability(ExecState* exec, JSGlobalObject* globalObject, JSPromiseConstructor* promiseConstructor)
+{
+    JSFunction* newPromiseCapabilityFunction = globalObject->newPromiseCapabilityFunction();
+    CallData callData;
+    CallType callType = JSC::getCallData(newPromiseCapabilityFunction, callData);
+    ASSERT(callType != CallTypeNone);
+
+    MarkedArgumentBuffer arguments;
+    arguments.append(promiseConstructor);
+    return call(exec, newPromiseCapabilityFunction, callType, callData, jsUndefined(), arguments);
+}
+
+
+JSPromiseDeferred* JSPromiseDeferred::create(ExecState* exec, JSGlobalObject* globalObject)
+{
+    VM& vm = exec->vm();
+
+    JSValue deferred = newPromiseCapability(exec, globalObject, globalObject->promiseConstructor());
+
+    JSValue promise = deferred.get(exec, vm.propertyNames->promisePrivateName);
+    ASSERT(promise.inherits(JSPromise::info()));
+    JSValue resolve = deferred.get(exec, vm.propertyNames->builtinNames().resolvePrivateName());
+    JSValue reject = deferred.get(exec, vm.propertyNames->builtinNames().rejectPrivateName());
+
+    return JSPromiseDeferred::create(vm, jsCast<JSPromise*>(promise), resolve, reject);
+}
+
+JSPromiseDeferred* JSPromiseDeferred::create(VM& vm, JSObject* promise, JSValue resolve, JSValue reject)
+{
+    JSPromiseDeferred* deferred = new (NotNull, allocateCell<JSPromiseDeferred>(vm.heap)) JSPromiseDeferred(vm);
+    deferred->finishCreation(vm, promise, resolve, reject);
+    return deferred;
+}
+
+JSPromiseDeferred::JSPromiseDeferred(VM& vm)
+    : JSPromiseDeferred(vm, vm.promiseDeferredStructure.get())
+{
+}
+
+JSPromiseDeferred::JSPromiseDeferred(VM& vm, Structure* structure)
+    : Base(vm, structure)
+{
+}
+
+static inline void callFunction(ExecState* exec, JSValue function, JSValue value)
+{
+    CallData callData;
+    CallType callType = getCallData(function, callData);
+    ASSERT(callType != CallTypeNone);
+
+    MarkedArgumentBuffer arguments;
+    arguments.append(value);
+
+    call(exec, function, callType, callData, jsUndefined(), arguments);
+}
+
+void JSPromiseDeferred::resolve(ExecState* exec, JSValue value)
+{
+    callFunction(exec, m_resolve.get(), value);
+}
+
+void JSPromiseDeferred::reject(ExecState* exec, JSValue reason)
+{
+    callFunction(exec, m_reject.get(), reason);
+}
+
+void JSPromiseDeferred::finishCreation(VM& vm, JSObject* promise, JSValue resolve, JSValue reject)
+{
+    Base::finishCreation(vm);
+    m_promise.set(vm, this, promise);
+    m_resolve.set(vm, this, resolve);
+    m_reject.set(vm, this, reject);
+}
+
+void JSPromiseDeferred::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    JSPromiseDeferred* thisObject = jsCast<JSPromiseDeferred*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+
+    Base::visitChildren(thisObject, visitor);
+
+    visitor.append(&thisObject->m_promise);
+    visitor.append(&thisObject->m_resolve);
+    visitor.append(&thisObject->m_reject);
+}
+
+} // namespace JSC