diff --git a/Source/JavaScriptCore/runtime/JSPromise.cpp b/Source/JavaScriptCore/runtime/JSPromise.cpp
new file mode 100644
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--- /dev/null
+++ b/Source/JavaScriptCore/runtime/JSPromise.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 "JSPromise.h"
+
+#include "Error.h"
+#include "JSCJSValueInlines.h"
+#include "JSCellInlines.h"
+#include "JSPromiseResolver.h"
+#include "SlotVisitorInlines.h"
+#include "StrongInlines.h"
+#include "StructureInlines.h"
+
+namespace JSC {
+
+class JSPromiseTaskContext : public TaskContext {
+public:
+    static PassRefPtr<JSPromiseTaskContext> create(VM& vm, JSPromise* promise)
+    {
+        return adoptRef(new JSPromiseTaskContext(vm, promise));
+    }
+
+    JSPromise& promise() const { return *m_promise.get(); }
+
+private:
+    JSPromiseTaskContext(VM& vm, JSPromise* promise)
+    {
+        m_promise.set(vm, promise);
+    }
+
+    Strong<JSPromise> m_promise;
+};
+
+const ClassInfo JSPromise::s_info = { "Promise", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSPromise) };
+
+JSPromise* JSPromise::create(VM& vm, Structure* structure)
+{
+    JSPromise* promise = new (NotNull, allocateCell<JSPromise>(vm.heap)) JSPromise(vm, structure);
+    promise->finishCreation(vm);
+    return promise;
+}
+
+JSPromise* JSPromise::createWithResolver(VM& vm, JSGlobalObject* globalObject)
+{
+    JSPromise* promise = new (NotNull, allocateCell<JSPromise>(vm.heap)) JSPromise(vm, globalObject->promiseStructure());
+    promise->finishCreation(vm);
+
+    JSPromiseResolver* resolver = JSPromiseResolver::create(vm, globalObject->promiseResolverStructure(), promise);
+    promise->setResolver(vm, resolver);
+
+    return promise;
+}
+
+Structure* JSPromise::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+{
+    return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
+}
+
+JSPromise::JSPromise(VM& vm, Structure* structure)
+    : JSDestructibleObject(vm, structure)
+    , m_state(Pending)
+{
+}
+
+void JSPromise::finishCreation(VM& vm)
+{
+    Base::finishCreation(vm);
+    ASSERT(inherits(info()));
+}
+
+void JSPromise::destroy(JSCell* cell)
+{
+    static_cast<JSPromise*>(cell)->JSPromise::~JSPromise();
+}
+
+void JSPromise::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+    JSPromise* thisObject = jsCast<JSPromise*>(cell);
+    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
+    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
+
+    Base::visitChildren(thisObject, visitor);
+
+    visitor.append(&thisObject->m_resolver);
+    visitor.append(&thisObject->m_result);
+
+    for (size_t i = 0; i < thisObject->m_fulfillCallbacks.size(); ++i)
+        visitor.append(&thisObject->m_fulfillCallbacks[i]);
+    for (size_t i = 0; i < thisObject->m_rejectCallbacks.size(); ++i)
+        visitor.append(&thisObject->m_rejectCallbacks[i]);
+}
+
+void JSPromise::setResolver(VM& vm, JSPromiseResolver* resolver)
+{
+    m_resolver.set(vm, this, resolver);
+}
+
+JSPromiseResolver* JSPromise::resolver() const
+{
+    return m_resolver.get();
+}
+
+void JSPromise::setResult(VM& vm, JSValue result)
+{
+    m_result.set(vm, this, result);
+}
+
+JSValue JSPromise::result() const
+{
+    return m_result.get();
+}
+
+void JSPromise::setState(JSPromise::State state)
+{
+    ASSERT(m_state == Pending);
+    m_state = state;
+}
+
+JSPromise::State JSPromise::state() const
+{
+    return m_state;
+}
+
+void JSPromise::appendCallbacks(ExecState* exec, InternalFunction* fulfillCallback, InternalFunction* rejectCallback)
+{
+    // 1. Append fulfillCallback to promise's fulfill callbacks.
+    m_fulfillCallbacks.append(WriteBarrier<InternalFunction>(exec->vm(), this, fulfillCallback));
+    
+    // 2. Append rejectCallback to promise' reject callbacks.
+    m_rejectCallbacks.append(WriteBarrier<InternalFunction>(exec->vm(), this, rejectCallback));
+
+    // 3. If promise's state is fulfilled, queue a task to process promise's fulfill callbacks with promise's result.
+    if (m_state == Fulfilled) {
+        queueTaskToProcessFulfillCallbacks(exec);
+        return;
+    }
+
+    // 4. If promise's state is rejected, queue a task to process promise's reject callbacks with promise's result.
+    if (m_state == Rejected) {
+        queueTaskToProcessRejectCallbacks(exec);
+        return;
+    }
+}
+
+void JSPromise::queueTaskToProcessFulfillCallbacks(ExecState* exec)
+{
+    JSGlobalObject* globalObject = this->globalObject();
+    if (globalObject->globalObjectMethodTable()->queueTaskToEventLoop)
+        globalObject->globalObjectMethodTable()->queueTaskToEventLoop(globalObject, processFulfillCallbacksForTask, JSPromiseTaskContext::create(exec->vm(), this));
+    else
+        WTFLogAlways("ERROR: Event loop not supported.");
+}
+
+void JSPromise::queueTaskToProcessRejectCallbacks(ExecState* exec)
+{
+    JSGlobalObject* globalObject = this->globalObject();
+    if (globalObject->globalObjectMethodTable()->queueTaskToEventLoop)
+        globalObject->globalObjectMethodTable()->queueTaskToEventLoop(globalObject, processRejectCallbacksForTask, JSPromiseTaskContext::create(exec->vm(), this));
+    else
+        WTFLogAlways("ERROR: Event loop not supported.");
+}
+
+void JSPromise::processFulfillCallbacksForTask(ExecState* exec, TaskContext* taskContext)
+{
+    JSPromiseTaskContext* promiseTaskContext = static_cast<JSPromiseTaskContext*>(taskContext);
+    JSPromise& promise = promiseTaskContext->promise();
+
+    promise.processFulfillCallbacksWithValue(exec, promise.result());
+}
+
+void JSPromise::processRejectCallbacksForTask(ExecState* exec, TaskContext* taskContext)
+{
+    JSPromiseTaskContext* promiseTaskContext = static_cast<JSPromiseTaskContext*>(taskContext);
+    JSPromise& promise = promiseTaskContext->promise();
+
+    promise.processRejectCallbacksWithValue(exec, promise.result());
+}
+
+void JSPromise::processFulfillCallbacksWithValue(ExecState* exec, JSValue value)
+{
+    ASSERT(m_state == Fulfilled);
+
+    for (size_t i = 0; i < m_fulfillCallbacks.size(); ++i) {
+        JSValue callback = m_fulfillCallbacks[i].get();
+
+        CallData callData;
+        CallType callType = JSC::getCallData(callback, callData);
+        ASSERT(callType != CallTypeNone);
+
+        MarkedArgumentBuffer arguments;
+        arguments.append(value);
+        call(exec, callback, callType, callData, this, arguments);
+    }
+    
+    m_fulfillCallbacks.clear();
+}
+
+void JSPromise::processRejectCallbacksWithValue(ExecState* exec, JSValue value)
+{
+    ASSERT(m_state == Rejected);
+
+    for (size_t i = 0; i < m_rejectCallbacks.size(); ++i) {
+        JSValue callback = m_rejectCallbacks[i].get();
+
+        CallData callData;
+        CallType callType = JSC::getCallData(callback, callData);
+        ASSERT(callType != CallTypeNone);
+
+        MarkedArgumentBuffer arguments;
+        arguments.append(value);
+        call(exec, callback, callType, callData, this, arguments);
+    }
+    
+    m_rejectCallbacks.clear();
+}
+
+} // namespace JSC