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diff --git a/Source/JavaScriptCore/runtime/JSModuleLoader.cpp b/Source/JavaScriptCore/runtime/JSModuleLoader.cpp
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+++ b/Source/JavaScriptCore/runtime/JSModuleLoader.cpp
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+/*
+ * Copyright (C) 2015 Apple Inc. All Rights Reserved.
+ * Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * 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. ``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
+ * 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 "JSModuleLoader.h"
+
+#include "BuiltinNames.h"
+#include "CodeProfiling.h"
+#include "Error.h"
+#include "Exception.h"
+#include "JSCInlines.h"
+#include "JSGlobalObjectFunctions.h"
+#include "JSInternalPromise.h"
+#include "JSInternalPromiseDeferred.h"
+#include "JSMap.h"
+#include "JSModuleEnvironment.h"
+#include "JSModuleRecord.h"
+#include "JSSourceCode.h"
+#include "ModuleAnalyzer.h"
+#include "ModuleLoaderPrototype.h"
+#include "Nodes.h"
+#include "Parser.h"
+#include "ParserError.h"
+
+namespace JSC {
+
+STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSModuleLoader);
+
+const ClassInfo JSModuleLoader::s_info = { "ModuleLoader", &Base::s_info, nullptr, CREATE_METHOD_TABLE(JSModuleLoader) };
+
+JSModuleLoader::JSModuleLoader(VM& vm, Structure* structure)
+    : JSNonFinalObject(vm, structure)
+{
+}
+
+void JSModuleLoader::finishCreation(ExecState* exec, VM& vm, JSGlobalObject* globalObject)
+{
+    auto scope = DECLARE_CATCH_SCOPE(vm);
+
+    Base::finishCreation(vm);
+    ASSERT(inherits(vm, info()));
+    JSMap* map = JSMap::create(exec, vm, globalObject->mapStructure());
+    RELEASE_ASSERT(!scope.exception());
+    putDirect(vm, Identifier::fromString(&vm, "registry"), map);
+}
+
+// ------------------------------ Functions --------------------------------
+
+static String printableModuleKey(ExecState* exec, JSValue key)
+{
+    if (key.isString() || key.isSymbol())
+        return key.toPropertyKey(exec).impl();
+    return exec->propertyNames().emptyIdentifier.impl();
+}
+
+JSValue JSModuleLoader::provide(ExecState* exec, JSValue key, Status status, const SourceCode& sourceCode)
+{
+    VM& vm = exec->vm();
+    JSObject* function = jsCast<JSObject*>(get(exec, exec->propertyNames().builtinNames().providePublicName()));
+    CallData callData;
+    CallType callType = JSC::getCallData(function, callData);
+    ASSERT(callType != CallType::None);
+
+    SourceCode source { sourceCode };
+    MarkedArgumentBuffer arguments;
+    arguments.append(key);
+    arguments.append(jsNumber(status));
+    arguments.append(JSSourceCode::create(vm, WTFMove(source)));
+
+    return call(exec, function, callType, callData, this, arguments);
+}
+
+JSInternalPromise* JSModuleLoader::loadAndEvaluateModule(ExecState* exec, JSValue moduleName, JSValue referrer, JSValue scriptFetcher)
+{
+    JSObject* function = jsCast<JSObject*>(get(exec, exec->propertyNames().builtinNames().loadAndEvaluateModulePublicName()));
+    CallData callData;
+    CallType callType = JSC::getCallData(function, callData);
+    ASSERT(callType != CallType::None);
+
+    MarkedArgumentBuffer arguments;
+    arguments.append(moduleName);
+    arguments.append(referrer);
+    arguments.append(scriptFetcher);
+
+    return jsCast<JSInternalPromise*>(call(exec, function, callType, callData, this, arguments));
+}
+
+JSInternalPromise* JSModuleLoader::loadModule(ExecState* exec, JSValue moduleName, JSValue referrer, JSValue scriptFetcher)
+{
+    JSObject* function = jsCast<JSObject*>(get(exec, exec->propertyNames().builtinNames().loadModulePublicName()));
+    CallData callData;
+    CallType callType = JSC::getCallData(function, callData);
+    ASSERT(callType != CallType::None);
+
+    MarkedArgumentBuffer arguments;
+    arguments.append(moduleName);
+    arguments.append(referrer);
+    arguments.append(scriptFetcher);
+
+    return jsCast<JSInternalPromise*>(call(exec, function, callType, callData, this, arguments));
+}
+
+JSValue JSModuleLoader::linkAndEvaluateModule(ExecState* exec, JSValue moduleKey, JSValue scriptFetcher)
+{
+    JSObject* function = jsCast<JSObject*>(get(exec, exec->propertyNames().builtinNames().linkAndEvaluateModulePublicName()));
+    CallData callData;
+    CallType callType = JSC::getCallData(function, callData);
+    ASSERT(callType != CallType::None);
+
+    MarkedArgumentBuffer arguments;
+    arguments.append(moduleKey);
+    arguments.append(scriptFetcher);
+
+    return call(exec, function, callType, callData, this, arguments);
+}
+
+JSInternalPromise* JSModuleLoader::requestImportModule(ExecState* exec, const Identifier& moduleKey, JSValue scriptFetcher)
+{
+    auto* function = jsCast<JSObject*>(get(exec, exec->propertyNames().builtinNames().requestImportModulePublicName()));
+    CallData callData;
+    auto callType = JSC::getCallData(function, callData);
+    ASSERT(callType != CallType::None);
+
+    MarkedArgumentBuffer arguments;
+    arguments.append(jsString(exec, moduleKey.impl()));
+    arguments.append(scriptFetcher);
+
+    return jsCast<JSInternalPromise*>(call(exec, function, callType, callData, this, arguments));
+}
+
+JSInternalPromise* JSModuleLoader::importModule(ExecState* exec, JSString* moduleName, const SourceOrigin& referrer)
+{
+    if (Options::dumpModuleLoadingState())
+        dataLog("Loader [import] ", printableModuleKey(exec, moduleName), "\n");
+
+    auto* globalObject = exec->lexicalGlobalObject();
+    VM& vm = globalObject->vm();
+    auto scope = DECLARE_CATCH_SCOPE(vm);
+
+    if (globalObject->globalObjectMethodTable()->moduleLoaderImportModule)
+        return globalObject->globalObjectMethodTable()->moduleLoaderImportModule(globalObject, exec, this, moduleName, referrer);
+
+    auto* deferred = JSInternalPromiseDeferred::create(exec, globalObject);
+    auto moduleNameString = moduleName->value(exec);
+    if (UNLIKELY(scope.exception())) {
+        JSValue exception = scope.exception()->value();
+        scope.clearException();
+        deferred->reject(exec, exception);
+        return deferred->promise();
+    }
+    deferred->reject(exec, createError(exec, makeString("Could not import the module '", moduleNameString, "'.")));
+    return deferred->promise();
+}
+
+JSInternalPromise* JSModuleLoader::resolve(ExecState* exec, JSValue name, JSValue referrer, JSValue scriptFetcher)
+{
+    if (Options::dumpModuleLoadingState())
+        dataLog("Loader [resolve] ", printableModuleKey(exec, name), "\n");
+
+    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
+    if (globalObject->globalObjectMethodTable()->moduleLoaderResolve)
+        return globalObject->globalObjectMethodTable()->moduleLoaderResolve(globalObject, exec, this, name, referrer, scriptFetcher);
+    JSInternalPromiseDeferred* deferred = JSInternalPromiseDeferred::create(exec, globalObject);
+    deferred->resolve(exec, name);
+    return deferred->promise();
+}
+
+JSInternalPromise* JSModuleLoader::fetch(ExecState* exec, JSValue key, JSValue scriptFetcher)
+{
+    if (Options::dumpModuleLoadingState())
+        dataLog("Loader [fetch] ", printableModuleKey(exec, key), "\n");
+
+    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
+    VM& vm = globalObject->vm();
+    auto scope = DECLARE_CATCH_SCOPE(vm);
+    if (globalObject->globalObjectMethodTable()->moduleLoaderFetch)
+        return globalObject->globalObjectMethodTable()->moduleLoaderFetch(globalObject, exec, this, key, scriptFetcher);
+    JSInternalPromiseDeferred* deferred = JSInternalPromiseDeferred::create(exec, globalObject);
+    String moduleKey = key.toWTFString(exec);
+    if (UNLIKELY(scope.exception())) {
+        JSValue exception = scope.exception()->value();
+        scope.clearException();
+        deferred->reject(exec, exception);
+        return deferred->promise();
+    }
+    deferred->reject(exec, createError(exec, makeString("Could not open the module '", moduleKey, "'.")));
+    return deferred->promise();
+}
+
+JSInternalPromise* JSModuleLoader::instantiate(ExecState* exec, JSValue key, JSValue source, JSValue scriptFetcher)
+{
+    if (Options::dumpModuleLoadingState())
+        dataLog("Loader [instantiate] ", printableModuleKey(exec, key), "\n");
+
+    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
+    if (globalObject->globalObjectMethodTable()->moduleLoaderInstantiate)
+        return globalObject->globalObjectMethodTable()->moduleLoaderInstantiate(globalObject, exec, this, key, source, scriptFetcher);
+    JSInternalPromiseDeferred* deferred = JSInternalPromiseDeferred::create(exec, globalObject);
+    deferred->resolve(exec, jsUndefined());
+    return deferred->promise();
+}
+
+JSValue JSModuleLoader::evaluate(ExecState* exec, JSValue key, JSValue moduleRecordValue, JSValue scriptFetcher)
+{
+    if (Options::dumpModuleLoadingState())
+        dataLog("Loader [evaluate] ", printableModuleKey(exec, key), "\n");
+
+    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
+    if (globalObject->globalObjectMethodTable()->moduleLoaderEvaluate)
+        return globalObject->globalObjectMethodTable()->moduleLoaderEvaluate(globalObject, exec, this, key, moduleRecordValue, scriptFetcher);
+
+    JSModuleRecord* moduleRecord = jsDynamicCast<JSModuleRecord*>(exec->vm(), moduleRecordValue);
+    if (!moduleRecord)
+        return jsUndefined();
+    return moduleRecord->evaluate(exec);
+}
+
+JSModuleNamespaceObject* JSModuleLoader::getModuleNamespaceObject(ExecState* exec, JSValue moduleRecordValue)
+{
+    VM& vm = exec->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(vm, moduleRecordValue);
+    if (!moduleRecord) {
+        throwTypeError(exec, scope);
+        return nullptr;
+    }
+
+    scope.release();
+    return moduleRecord->getModuleNamespace(exec);
+}
+
+} // namespace JSC