Source/JavaScriptCore/runtime/JSModuleLoader.cpp - external/github.com/WebKit/webkit - Git at Google

 /*
  * Copyright (C) 2015-2021 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 "CatchScope.h"
 #include "JSCInlines.h"
 #include "JSInternalPromise.h"
 #include "JSMap.h"
 #include "JSModuleNamespaceObject.h"
 #include "JSModuleRecord.h"
 #include "JSSourceCode.h"
 #include "JSWebAssembly.h"
 #include "ModuleAnalyzer.h"
 #include "Nodes.h"
 #include "ObjectConstructor.h"
 #include "Parser.h"
 #include "ParserError.h"

 namespace JSC {

 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderParseModule);
 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderRequestedModules);
 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderEvaluate);
 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderModuleDeclarationInstantiation);
 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderResolve);
 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderResolveSync);
 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderFetch);
 static JSC_DECLARE_HOST_FUNCTION(moduleLoaderGetModuleNamespaceObject);

 }

 #include "JSModuleLoader.lut.h"

 namespace JSC {

 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSModuleLoader);

 const ClassInfo JSModuleLoader::s_info = { "ModuleLoader", &Base::s_info, &moduleLoaderTable, nullptr, CREATE_METHOD_TABLE(JSModuleLoader) };

 /* Source for JSModuleLoader.lut.h
 @begin moduleLoaderTable
     ensureRegistered               JSBuiltin                                  DontEnum|Function 1
     forceFulfillPromise            JSBuiltin                                  DontEnum|Function 2
     fulfillFetch                   JSBuiltin                                  DontEnum|Function 2
     requestFetch                   JSBuiltin                                  DontEnum|Function 3
     requestInstantiate             JSBuiltin                                  DontEnum|Function 3
     requestSatisfy                 JSBuiltin                                  DontEnum|Function 3
     link                           JSBuiltin                                  DontEnum|Function 2
     moduleDeclarationInstantiation moduleLoaderModuleDeclarationInstantiation DontEnum|Function 2
     moduleEvaluation               JSBuiltin                                  DontEnum|Function 2
     asyncModuleEvaluation          JSBuiltin                                  DontEnum|Function 3
     evaluate                       moduleLoaderEvaluate                       DontEnum|Function 3
     provideFetch                   JSBuiltin                                  DontEnum|Function 2
     loadAndEvaluateModule          JSBuiltin                                  DontEnum|Function 3
     loadModule                     JSBuiltin                                  DontEnum|Function 3
     linkAndEvaluateModule          JSBuiltin                                  DontEnum|Function 2
     requestImportModule            JSBuiltin                                  DontEnum|Function 3
     dependencyKeysIfEvaluated      JSBuiltin                                  DontEnum|Function 1
     getModuleNamespaceObject       moduleLoaderGetModuleNamespaceObject       DontEnum|Function 1
     parseModule                    moduleLoaderParseModule                    DontEnum|Function 2
     requestedModules               moduleLoaderRequestedModules               DontEnum|Function 1
     resolve                        moduleLoaderResolve                        DontEnum|Function 2
     resolveSync                    moduleLoaderResolveSync                    DontEnum|Function 2
     fetch                          moduleLoaderFetch                          DontEnum|Function 3
 @end
 */

 JSModuleLoader::JSModuleLoader(VM& vm, Structure* structure)
     : JSNonFinalObject(vm, structure)
 {
 }

 void JSModuleLoader::finishCreation(JSGlobalObject* globalObject, VM& vm)
 {
     auto scope = DECLARE_CATCH_SCOPE(vm);

     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
     JSMap* map = JSMap::create(globalObject, vm, globalObject->mapStructure());
     scope.releaseAssertNoException();
     putDirect(vm, Identifier::fromString(vm, "registry"), map);
 }

 // ------------------------------ Functions --------------------------------

 static String printableModuleKey(JSGlobalObject* globalObject, JSValue key)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_CATCH_SCOPE(vm);
     if (key.isString() || key.isSymbol()) {
         auto propertyName = key.toPropertyKey(globalObject);
         scope.assertNoExceptionExceptTermination(); // This is OK since this function is just for debugging purpose.
         return propertyName.impl();
     }
     return vm.propertyNames->emptyIdentifier.impl();
 }

 JSArray* JSModuleLoader::dependencyKeysIfEvaluated(JSGlobalObject* globalObject, JSValue key)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().dependencyKeysIfEvaluatedPublicName());
     RETURN_IF_EXCEPTION(scope, nullptr);
     auto callData = JSC::getCallData(vm, function);
     ASSERT(callData.type != CallData::Type::None);

     MarkedArgumentBuffer arguments;
     arguments.append(key);

     JSValue result = call(globalObject, function, callData, this, arguments);
     RETURN_IF_EXCEPTION(scope, nullptr);

     return jsDynamicCast<JSArray*>(vm, result);
 }

 JSValue JSModuleLoader::provideFetch(JSGlobalObject* globalObject, JSValue key, const SourceCode& sourceCode)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().provideFetchPublicName());
     RETURN_IF_EXCEPTION(scope, { });
     auto callData = JSC::getCallData(vm, function);
     ASSERT(callData.type != CallData::Type::None);

     SourceCode source { sourceCode };
     MarkedArgumentBuffer arguments;
     arguments.append(key);
     arguments.append(JSSourceCode::create(vm, WTFMove(source)));
     ASSERT(!arguments.hasOverflowed());

     RELEASE_AND_RETURN(scope, call(globalObject, function, callData, this, arguments));
 }

 JSInternalPromise* JSModuleLoader::loadAndEvaluateModule(JSGlobalObject* globalObject, JSValue moduleName, JSValue parameters, JSValue scriptFetcher)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().loadAndEvaluateModulePublicName());
     RETURN_IF_EXCEPTION(scope, nullptr);
     auto callData = JSC::getCallData(vm, function);
     ASSERT(callData.type != CallData::Type::None);

     MarkedArgumentBuffer arguments;
     arguments.append(moduleName);
     arguments.append(parameters);
     arguments.append(scriptFetcher);
     ASSERT(!arguments.hasOverflowed());

     JSValue promise = call(globalObject, function, callData, this, arguments);
     RETURN_IF_EXCEPTION(scope, nullptr);
     return jsCast<JSInternalPromise*>(promise);
 }

 JSInternalPromise* JSModuleLoader::loadModule(JSGlobalObject* globalObject, JSValue moduleName, JSValue parameters, JSValue scriptFetcher)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().loadModulePublicName());
     RETURN_IF_EXCEPTION(scope, nullptr);
     auto callData = JSC::getCallData(vm, function);
     ASSERT(callData.type != CallData::Type::None);

     MarkedArgumentBuffer arguments;
     arguments.append(moduleName);
     arguments.append(parameters);
     arguments.append(scriptFetcher);
     ASSERT(!arguments.hasOverflowed());

     JSValue promise = call(globalObject, function, callData, this, arguments);
     RETURN_IF_EXCEPTION(scope, nullptr);
     return jsCast<JSInternalPromise*>(promise);
 }

 JSValue JSModuleLoader::linkAndEvaluateModule(JSGlobalObject* globalObject, JSValue moduleKey, JSValue scriptFetcher)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().linkAndEvaluateModulePublicName());
     RETURN_IF_EXCEPTION(scope, { });
     auto callData = JSC::getCallData(vm, function);
     ASSERT(callData.type != CallData::Type::None);

     MarkedArgumentBuffer arguments;
     arguments.append(moduleKey);
     arguments.append(scriptFetcher);
     ASSERT(!arguments.hasOverflowed());

     RELEASE_AND_RETURN(scope, call(globalObject, function, callData, this, arguments));
 }

 JSInternalPromise* JSModuleLoader::requestImportModule(JSGlobalObject* globalObject, const Identifier& moduleKey, JSValue parameters, JSValue scriptFetcher)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().requestImportModulePublicName());
     RETURN_IF_EXCEPTION(scope, nullptr);
     auto callData = JSC::getCallData(vm, function);
     ASSERT(callData.type != CallData::Type::None);

     MarkedArgumentBuffer arguments;
     arguments.append(jsString(vm, moduleKey.impl()));
     arguments.append(parameters);
     arguments.append(scriptFetcher);
     ASSERT(!arguments.hasOverflowed());

     JSValue promise = call(globalObject, function, callData, this, arguments);
     RETURN_IF_EXCEPTION(scope, nullptr);
     return jsCast<JSInternalPromise*>(promise);
 }

 JSInternalPromise* JSModuleLoader::importModule(JSGlobalObject* globalObject, JSString* moduleName, JSValue parameters, const SourceOrigin& referrer)
 {
     dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [import] ", printableModuleKey(globalObject, moduleName));

     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     if (globalObject->globalObjectMethodTable()->moduleLoaderImportModule)
         RELEASE_AND_RETURN(scope, globalObject->globalObjectMethodTable()->moduleLoaderImportModule(globalObject, this, moduleName, parameters, referrer));

     auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());
     String moduleNameString = moduleName->value(globalObject);
     RETURN_IF_EXCEPTION(scope, promise->rejectWithCaughtException(globalObject, scope));

     scope.release();
     promise->reject(globalObject, createError(globalObject, makeString("Could not import the module '", moduleNameString, "'.")));
     return promise;
 }

 Identifier JSModuleLoader::resolveSync(JSGlobalObject* globalObject, JSValue name, JSValue referrer, JSValue scriptFetcher)
 {
     dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [resolve] ", printableModuleKey(globalObject, name));

     if (globalObject->globalObjectMethodTable()->moduleLoaderResolve)
         return globalObject->globalObjectMethodTable()->moduleLoaderResolve(globalObject, this, name, referrer, scriptFetcher);
     return name.toPropertyKey(globalObject);
 }

 JSInternalPromise* JSModuleLoader::resolve(JSGlobalObject* globalObject, JSValue name, JSValue referrer, JSValue scriptFetcher)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());
     const Identifier moduleKey = resolveSync(globalObject, name, referrer, scriptFetcher);
     RETURN_IF_EXCEPTION(scope, promise->rejectWithCaughtException(globalObject, scope));

     scope.release();
     promise->resolve(globalObject, identifierToJSValue(vm, moduleKey));
     return promise;
 }

 JSInternalPromise* JSModuleLoader::fetch(JSGlobalObject* globalObject, JSValue key, JSValue parameters, JSValue scriptFetcher)
 {
     dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [fetch] ", printableModuleKey(globalObject, key));

     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     if (globalObject->globalObjectMethodTable()->moduleLoaderFetch)
         RELEASE_AND_RETURN(scope, globalObject->globalObjectMethodTable()->moduleLoaderFetch(globalObject, this, key, parameters, scriptFetcher));

     auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());
     String moduleKey = key.toWTFString(globalObject);
     RETURN_IF_EXCEPTION(scope, promise->rejectWithCaughtException(globalObject, scope));

     scope.release();
     promise->reject(globalObject, createError(globalObject, makeString("Could not open the module '", moduleKey, "'.")));
     return promise;
 }

 JSObject* JSModuleLoader::createImportMetaProperties(JSGlobalObject* globalObject, JSValue key, JSModuleRecord* moduleRecord, JSValue scriptFetcher)
 {
     if (globalObject->globalObjectMethodTable()->moduleLoaderCreateImportMetaProperties)
         return globalObject->globalObjectMethodTable()->moduleLoaderCreateImportMetaProperties(globalObject, this, key, moduleRecord, scriptFetcher);
     return constructEmptyObject(globalObject->vm(), globalObject->nullPrototypeObjectStructure());
 }

 JSValue JSModuleLoader::evaluate(JSGlobalObject* globalObject, JSValue key, JSValue moduleRecordValue, JSValue scriptFetcher, JSValue sentValue, JSValue resumeMode)
 {
     dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [evaluate] ", printableModuleKey(globalObject, key));

     if (globalObject->globalObjectMethodTable()->moduleLoaderEvaluate)
         return globalObject->globalObjectMethodTable()->moduleLoaderEvaluate(globalObject, this, key, moduleRecordValue, scriptFetcher, sentValue, resumeMode);

     return evaluateNonVirtual(globalObject, key, moduleRecordValue, scriptFetcher, sentValue, resumeMode);
 }

 JSValue JSModuleLoader::evaluateNonVirtual(JSGlobalObject* globalObject, JSValue, JSValue moduleRecordValue, JSValue, JSValue sentValue, JSValue resumeMode)
 {
     if (auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(globalObject->vm(), moduleRecordValue))
         return moduleRecord->evaluate(globalObject, sentValue, resumeMode);
     return jsUndefined();
 }

 JSModuleNamespaceObject* JSModuleLoader::getModuleNamespaceObject(JSGlobalObject* globalObject, JSValue moduleRecordValue)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(vm, moduleRecordValue);
     if (!moduleRecord) {
         throwTypeError(globalObject, scope);
         return nullptr;
     }

     RELEASE_AND_RETURN(scope, moduleRecord->getModuleNamespace(globalObject));
 }

 // ------------------------------ Functions --------------------------------

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderParseModule, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();

     auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());

     auto scope = DECLARE_THROW_SCOPE(vm);

     auto rejectWithError = [&](JSValue error) {
         promise->reject(globalObject, error);
         return promise;
     };

     const Identifier moduleKey = callFrame->argument(0).toPropertyKey(globalObject);
     RETURN_IF_EXCEPTION(scope, JSValue::encode(promise->rejectWithCaughtException(globalObject, scope)));

     JSValue source = callFrame->argument(1);
     auto* jsSourceCode = jsCast<JSSourceCode*>(source);
     SourceCode sourceCode = jsSourceCode->sourceCode();

 #if ENABLE(WEBASSEMBLY)
     if (sourceCode.provider()->sourceType() == SourceProviderSourceType::WebAssembly)
         RELEASE_AND_RETURN(scope, JSValue::encode(JSWebAssembly::instantiate(globalObject, promise, moduleKey, jsSourceCode)));
 #endif

     dataLogLnIf(Options::dumpModuleLoadingState(), "loader [parsing] ", moduleKey);

     ParserError error;
     std::unique_ptr<ModuleProgramNode> moduleProgramNode = parse<ModuleProgramNode>(
         vm, sourceCode, Identifier(), JSParserBuiltinMode::NotBuiltin,
         JSParserStrictMode::Strict, JSParserScriptMode::Module, SourceParseMode::ModuleAnalyzeMode, SuperBinding::NotNeeded, error);
     if (error.isValid())
         RELEASE_AND_RETURN(scope, JSValue::encode(rejectWithError(error.toErrorObject(globalObject, sourceCode))));
     ASSERT(moduleProgramNode);

     ModuleAnalyzer moduleAnalyzer(globalObject, moduleKey, sourceCode, moduleProgramNode->varDeclarations(), moduleProgramNode->lexicalVariables());
     RETURN_IF_EXCEPTION(scope, JSValue::encode(promise->rejectWithCaughtException(globalObject, scope)));

     scope.release();
     promise->resolve(globalObject, moduleAnalyzer.analyze(*moduleProgramNode));
     return JSValue::encode(promise);
 }

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderRequestedModules, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
     auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(vm, callFrame->argument(0));
     if (!moduleRecord)
         RELEASE_AND_RETURN(scope, JSValue::encode(constructEmptyArray(globalObject, nullptr)));

     JSArray* result = constructEmptyArray(globalObject, nullptr, moduleRecord->requestedModules().size());
     RETURN_IF_EXCEPTION(scope, encodedJSValue());
     size_t i = 0;
     for (auto& key : moduleRecord->requestedModules()) {
         result->putDirectIndex(globalObject, i++, jsString(vm, key.get()));
         RETURN_IF_EXCEPTION(scope, encodedJSValue());
     }
     return JSValue::encode(result);
 }

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderModuleDeclarationInstantiation, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
     auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(vm, callFrame->argument(0));
     if (!moduleRecord)
         return JSValue::encode(jsUndefined());

     dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [link] ", moduleRecord->moduleKey());

     auto sync = moduleRecord->link(globalObject, callFrame->argument(1));
     RETURN_IF_EXCEPTION(scope, encodedJSValue());

     return JSValue::encode(jsBoolean(sync == Synchronousness::Async));
 }

 // ------------------------------ Hook Functions ---------------------------

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderResolve, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     // Hook point, Loader.resolve.
     // https://whatwg.github.io/loader/#browser-resolve
     // Take the name and resolve it to the unique identifier for the resource location.
     // For example, take the "jquery" and return the URL for the resource.
     JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
     if (!loader)
         return JSValue::encode(jsUndefined());
     return JSValue::encode(loader->resolve(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2)));
 }

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderResolveSync, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
     if (!loader)
         return JSValue::encode(jsUndefined());
     auto result = loader->resolveSync(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2));
     RETURN_IF_EXCEPTION(scope, encodedJSValue());
     return JSValue::encode(identifierToJSValue(vm, result));
 }

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderFetch, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     // Hook point, Loader.fetch
     // https://whatwg.github.io/loader/#browser-fetch
     // Take the key and fetch the resource actually.
     // For example, JavaScriptCore shell can provide the hook fetching the resource
     // from the local file system.
     JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
     if (!loader)
         return JSValue::encode(jsUndefined());
     return JSValue::encode(loader->fetch(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2)));
 }

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderGetModuleNamespaceObject, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
     if (!loader)
         return JSValue::encode(jsUndefined());
     auto* moduleNamespaceObject = loader->getModuleNamespaceObject(globalObject, callFrame->argument(0));
     RETURN_IF_EXCEPTION(scope, encodedJSValue());
     return JSValue::encode(moduleNamespaceObject);
 }

 // ------------------- Additional Hook Functions ---------------------------

 JSC_DEFINE_HOST_FUNCTION(moduleLoaderEvaluate, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     // To instrument and retrieve the errors raised from the module execution,
     // we inserted the hook point here.

     VM& vm = globalObject->vm();
     JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
     if (!loader)
         return JSValue::encode(jsUndefined());
     return JSValue::encode(loader->evaluate(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2), callFrame->argument(3), callFrame->argument(4)));
 }

 } // namespace JSC
	/*
	* Copyright (C) 2015-2021 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 "CatchScope.h"
	#include "JSCInlines.h"
	#include "JSInternalPromise.h"
	#include "JSMap.h"
	#include "JSModuleNamespaceObject.h"
	#include "JSModuleRecord.h"
	#include "JSSourceCode.h"
	#include "JSWebAssembly.h"
	#include "ModuleAnalyzer.h"
	#include "Nodes.h"
	#include "ObjectConstructor.h"
	#include "Parser.h"
	#include "ParserError.h"

	namespace JSC {

	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderParseModule);
	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderRequestedModules);
	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderEvaluate);
	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderModuleDeclarationInstantiation);
	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderResolve);
	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderResolveSync);
	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderFetch);
	static JSC_DECLARE_HOST_FUNCTION(moduleLoaderGetModuleNamespaceObject);

	}

	#include "JSModuleLoader.lut.h"

	namespace JSC {

	STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSModuleLoader);

	const ClassInfo JSModuleLoader::s_info = { "ModuleLoader", &Base::s_info, &moduleLoaderTable, nullptr, CREATE_METHOD_TABLE(JSModuleLoader) };

	/* Source for JSModuleLoader.lut.h
	@begin moduleLoaderTable
	ensureRegistered JSBuiltin DontEnum\|Function 1
	forceFulfillPromise JSBuiltin DontEnum\|Function 2
	fulfillFetch JSBuiltin DontEnum\|Function 2
	requestFetch JSBuiltin DontEnum\|Function 3
	requestInstantiate JSBuiltin DontEnum\|Function 3
	requestSatisfy JSBuiltin DontEnum\|Function 3
	link JSBuiltin DontEnum\|Function 2
	moduleDeclarationInstantiation moduleLoaderModuleDeclarationInstantiation DontEnum\|Function 2
	moduleEvaluation JSBuiltin DontEnum\|Function 2
	asyncModuleEvaluation JSBuiltin DontEnum\|Function 3
	evaluate moduleLoaderEvaluate DontEnum\|Function 3
	provideFetch JSBuiltin DontEnum\|Function 2
	loadAndEvaluateModule JSBuiltin DontEnum\|Function 3
	loadModule JSBuiltin DontEnum\|Function 3
	linkAndEvaluateModule JSBuiltin DontEnum\|Function 2
	requestImportModule JSBuiltin DontEnum\|Function 3
	dependencyKeysIfEvaluated JSBuiltin DontEnum\|Function 1
	getModuleNamespaceObject moduleLoaderGetModuleNamespaceObject DontEnum\|Function 1
	parseModule moduleLoaderParseModule DontEnum\|Function 2
	requestedModules moduleLoaderRequestedModules DontEnum\|Function 1
	resolve moduleLoaderResolve DontEnum\|Function 2
	resolveSync moduleLoaderResolveSync DontEnum\|Function 2
	fetch moduleLoaderFetch DontEnum\|Function 3
	@end
	*/

	JSModuleLoader::JSModuleLoader(VM& vm, Structure* structure)
	: JSNonFinalObject(vm, structure)
	{
	}

	void JSModuleLoader::finishCreation(JSGlobalObject* globalObject, VM& vm)
	{
	auto scope = DECLARE_CATCH_SCOPE(vm);

	Base::finishCreation(vm);
	ASSERT(inherits(vm, info()));
	JSMap* map = JSMap::create(globalObject, vm, globalObject->mapStructure());
	scope.releaseAssertNoException();
	putDirect(vm, Identifier::fromString(vm, "registry"), map);
	}

	// ------------------------------ Functions --------------------------------

	static String printableModuleKey(JSGlobalObject* globalObject, JSValue key)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_CATCH_SCOPE(vm);
	if (key.isString() \|\| key.isSymbol()) {
	auto propertyName = key.toPropertyKey(globalObject);
	scope.assertNoExceptionExceptTermination(); // This is OK since this function is just for debugging purpose.
	return propertyName.impl();
	}
	return vm.propertyNames->emptyIdentifier.impl();
	}

	JSArray* JSModuleLoader::dependencyKeysIfEvaluated(JSGlobalObject* globalObject, JSValue key)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().dependencyKeysIfEvaluatedPublicName());
	RETURN_IF_EXCEPTION(scope, nullptr);
	auto callData = JSC::getCallData(vm, function);
	ASSERT(callData.type != CallData::Type::None);

	MarkedArgumentBuffer arguments;
	arguments.append(key);

	JSValue result = call(globalObject, function, callData, this, arguments);
	RETURN_IF_EXCEPTION(scope, nullptr);

	return jsDynamicCast<JSArray*>(vm, result);
	}

	JSValue JSModuleLoader::provideFetch(JSGlobalObject* globalObject, JSValue key, const SourceCode& sourceCode)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().provideFetchPublicName());
	RETURN_IF_EXCEPTION(scope, { });
	auto callData = JSC::getCallData(vm, function);
	ASSERT(callData.type != CallData::Type::None);

	SourceCode source { sourceCode };
	MarkedArgumentBuffer arguments;
	arguments.append(key);
	arguments.append(JSSourceCode::create(vm, WTFMove(source)));
	ASSERT(!arguments.hasOverflowed());

	RELEASE_AND_RETURN(scope, call(globalObject, function, callData, this, arguments));
	}

	JSInternalPromise* JSModuleLoader::loadAndEvaluateModule(JSGlobalObject* globalObject, JSValue moduleName, JSValue parameters, JSValue scriptFetcher)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().loadAndEvaluateModulePublicName());
	RETURN_IF_EXCEPTION(scope, nullptr);
	auto callData = JSC::getCallData(vm, function);
	ASSERT(callData.type != CallData::Type::None);

	MarkedArgumentBuffer arguments;
	arguments.append(moduleName);
	arguments.append(parameters);
	arguments.append(scriptFetcher);
	ASSERT(!arguments.hasOverflowed());

	JSValue promise = call(globalObject, function, callData, this, arguments);
	RETURN_IF_EXCEPTION(scope, nullptr);
	return jsCast<JSInternalPromise*>(promise);
	}

	JSInternalPromise* JSModuleLoader::loadModule(JSGlobalObject* globalObject, JSValue moduleName, JSValue parameters, JSValue scriptFetcher)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().loadModulePublicName());
	RETURN_IF_EXCEPTION(scope, nullptr);
	auto callData = JSC::getCallData(vm, function);
	ASSERT(callData.type != CallData::Type::None);

	MarkedArgumentBuffer arguments;
	arguments.append(moduleName);
	arguments.append(parameters);
	arguments.append(scriptFetcher);
	ASSERT(!arguments.hasOverflowed());

	JSValue promise = call(globalObject, function, callData, this, arguments);
	RETURN_IF_EXCEPTION(scope, nullptr);
	return jsCast<JSInternalPromise*>(promise);
	}

	JSValue JSModuleLoader::linkAndEvaluateModule(JSGlobalObject* globalObject, JSValue moduleKey, JSValue scriptFetcher)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSObject* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().linkAndEvaluateModulePublicName());
	RETURN_IF_EXCEPTION(scope, { });
	auto callData = JSC::getCallData(vm, function);
	ASSERT(callData.type != CallData::Type::None);

	MarkedArgumentBuffer arguments;
	arguments.append(moduleKey);
	arguments.append(scriptFetcher);
	ASSERT(!arguments.hasOverflowed());

	RELEASE_AND_RETURN(scope, call(globalObject, function, callData, this, arguments));
	}

	JSInternalPromise* JSModuleLoader::requestImportModule(JSGlobalObject* globalObject, const Identifier& moduleKey, JSValue parameters, JSValue scriptFetcher)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* function = getAs<JSObject*>(globalObject, vm.propertyNames->builtinNames().requestImportModulePublicName());
	RETURN_IF_EXCEPTION(scope, nullptr);
	auto callData = JSC::getCallData(vm, function);
	ASSERT(callData.type != CallData::Type::None);

	MarkedArgumentBuffer arguments;
	arguments.append(jsString(vm, moduleKey.impl()));
	arguments.append(parameters);
	arguments.append(scriptFetcher);
	ASSERT(!arguments.hasOverflowed());

	JSValue promise = call(globalObject, function, callData, this, arguments);
	RETURN_IF_EXCEPTION(scope, nullptr);
	return jsCast<JSInternalPromise*>(promise);
	}

	JSInternalPromise* JSModuleLoader::importModule(JSGlobalObject* globalObject, JSString* moduleName, JSValue parameters, const SourceOrigin& referrer)
	{
	dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [import] ", printableModuleKey(globalObject, moduleName));

	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	if (globalObject->globalObjectMethodTable()->moduleLoaderImportModule)
	RELEASE_AND_RETURN(scope, globalObject->globalObjectMethodTable()->moduleLoaderImportModule(globalObject, this, moduleName, parameters, referrer));

	auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());
	String moduleNameString = moduleName->value(globalObject);
	RETURN_IF_EXCEPTION(scope, promise->rejectWithCaughtException(globalObject, scope));

	scope.release();
	promise->reject(globalObject, createError(globalObject, makeString("Could not import the module '", moduleNameString, "'.")));
	return promise;
	}

	Identifier JSModuleLoader::resolveSync(JSGlobalObject* globalObject, JSValue name, JSValue referrer, JSValue scriptFetcher)
	{
	dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [resolve] ", printableModuleKey(globalObject, name));

	if (globalObject->globalObjectMethodTable()->moduleLoaderResolve)
	return globalObject->globalObjectMethodTable()->moduleLoaderResolve(globalObject, this, name, referrer, scriptFetcher);
	return name.toPropertyKey(globalObject);
	}

	JSInternalPromise* JSModuleLoader::resolve(JSGlobalObject* globalObject, JSValue name, JSValue referrer, JSValue scriptFetcher)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());
	const Identifier moduleKey = resolveSync(globalObject, name, referrer, scriptFetcher);
	RETURN_IF_EXCEPTION(scope, promise->rejectWithCaughtException(globalObject, scope));

	scope.release();
	promise->resolve(globalObject, identifierToJSValue(vm, moduleKey));
	return promise;
	}

	JSInternalPromise* JSModuleLoader::fetch(JSGlobalObject* globalObject, JSValue key, JSValue parameters, JSValue scriptFetcher)
	{
	dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [fetch] ", printableModuleKey(globalObject, key));

	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	if (globalObject->globalObjectMethodTable()->moduleLoaderFetch)
	RELEASE_AND_RETURN(scope, globalObject->globalObjectMethodTable()->moduleLoaderFetch(globalObject, this, key, parameters, scriptFetcher));

	auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());
	String moduleKey = key.toWTFString(globalObject);
	RETURN_IF_EXCEPTION(scope, promise->rejectWithCaughtException(globalObject, scope));

	scope.release();
	promise->reject(globalObject, createError(globalObject, makeString("Could not open the module '", moduleKey, "'.")));
	return promise;
	}

	JSObject* JSModuleLoader::createImportMetaProperties(JSGlobalObject* globalObject, JSValue key, JSModuleRecord* moduleRecord, JSValue scriptFetcher)
	{
	if (globalObject->globalObjectMethodTable()->moduleLoaderCreateImportMetaProperties)
	return globalObject->globalObjectMethodTable()->moduleLoaderCreateImportMetaProperties(globalObject, this, key, moduleRecord, scriptFetcher);
	return constructEmptyObject(globalObject->vm(), globalObject->nullPrototypeObjectStructure());
	}

	JSValue JSModuleLoader::evaluate(JSGlobalObject* globalObject, JSValue key, JSValue moduleRecordValue, JSValue scriptFetcher, JSValue sentValue, JSValue resumeMode)
	{
	dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [evaluate] ", printableModuleKey(globalObject, key));

	if (globalObject->globalObjectMethodTable()->moduleLoaderEvaluate)
	return globalObject->globalObjectMethodTable()->moduleLoaderEvaluate(globalObject, this, key, moduleRecordValue, scriptFetcher, sentValue, resumeMode);

	return evaluateNonVirtual(globalObject, key, moduleRecordValue, scriptFetcher, sentValue, resumeMode);
	}

	JSValue JSModuleLoader::evaluateNonVirtual(JSGlobalObject* globalObject, JSValue, JSValue moduleRecordValue, JSValue, JSValue sentValue, JSValue resumeMode)
	{
	if (auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(globalObject->vm(), moduleRecordValue))
	return moduleRecord->evaluate(globalObject, sentValue, resumeMode);
	return jsUndefined();
	}

	JSModuleNamespaceObject* JSModuleLoader::getModuleNamespaceObject(JSGlobalObject* globalObject, JSValue moduleRecordValue)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(vm, moduleRecordValue);
	if (!moduleRecord) {
	throwTypeError(globalObject, scope);
	return nullptr;
	}

	RELEASE_AND_RETURN(scope, moduleRecord->getModuleNamespace(globalObject));
	}

	// ------------------------------ Functions --------------------------------

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderParseModule, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();

	auto* promise = JSInternalPromise::create(vm, globalObject->internalPromiseStructure());

	auto scope = DECLARE_THROW_SCOPE(vm);

	auto rejectWithError = [&](JSValue error) {
	promise->reject(globalObject, error);
	return promise;
	};

	const Identifier moduleKey = callFrame->argument(0).toPropertyKey(globalObject);
	RETURN_IF_EXCEPTION(scope, JSValue::encode(promise->rejectWithCaughtException(globalObject, scope)));

	JSValue source = callFrame->argument(1);
	auto* jsSourceCode = jsCast<JSSourceCode*>(source);
	SourceCode sourceCode = jsSourceCode->sourceCode();

	#if ENABLE(WEBASSEMBLY)
	if (sourceCode.provider()->sourceType() == SourceProviderSourceType::WebAssembly)
	RELEASE_AND_RETURN(scope, JSValue::encode(JSWebAssembly::instantiate(globalObject, promise, moduleKey, jsSourceCode)));
	#endif

	dataLogLnIf(Options::dumpModuleLoadingState(), "loader [parsing] ", moduleKey);

	ParserError error;
	std::unique_ptr<ModuleProgramNode> moduleProgramNode = parse<ModuleProgramNode>(
	vm, sourceCode, Identifier(), JSParserBuiltinMode::NotBuiltin,
	JSParserStrictMode::Strict, JSParserScriptMode::Module, SourceParseMode::ModuleAnalyzeMode, SuperBinding::NotNeeded, error);
	if (error.isValid())
	RELEASE_AND_RETURN(scope, JSValue::encode(rejectWithError(error.toErrorObject(globalObject, sourceCode))));
	ASSERT(moduleProgramNode);

	ModuleAnalyzer moduleAnalyzer(globalObject, moduleKey, sourceCode, moduleProgramNode->varDeclarations(), moduleProgramNode->lexicalVariables());
	RETURN_IF_EXCEPTION(scope, JSValue::encode(promise->rejectWithCaughtException(globalObject, scope)));

	scope.release();
	promise->resolve(globalObject, moduleAnalyzer.analyze(*moduleProgramNode));
	return JSValue::encode(promise);
	}

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderRequestedModules, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);
	auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(vm, callFrame->argument(0));
	if (!moduleRecord)
	RELEASE_AND_RETURN(scope, JSValue::encode(constructEmptyArray(globalObject, nullptr)));

	JSArray* result = constructEmptyArray(globalObject, nullptr, moduleRecord->requestedModules().size());
	RETURN_IF_EXCEPTION(scope, encodedJSValue());
	size_t i = 0;
	for (auto& key : moduleRecord->requestedModules()) {
	result->putDirectIndex(globalObject, i++, jsString(vm, key.get()));
	RETURN_IF_EXCEPTION(scope, encodedJSValue());
	}
	return JSValue::encode(result);
	}

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderModuleDeclarationInstantiation, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);
	auto* moduleRecord = jsDynamicCast<AbstractModuleRecord*>(vm, callFrame->argument(0));
	if (!moduleRecord)
	return JSValue::encode(jsUndefined());

	dataLogLnIf(Options::dumpModuleLoadingState(), "Loader [link] ", moduleRecord->moduleKey());

	auto sync = moduleRecord->link(globalObject, callFrame->argument(1));
	RETURN_IF_EXCEPTION(scope, encodedJSValue());

	return JSValue::encode(jsBoolean(sync == Synchronousness::Async));
	}

	// ------------------------------ Hook Functions ---------------------------

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderResolve, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	// Hook point, Loader.resolve.
	// https://whatwg.github.io/loader/#browser-resolve
	// Take the name and resolve it to the unique identifier for the resource location.
	// For example, take the "jquery" and return the URL for the resource.
	JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
	if (!loader)
	return JSValue::encode(jsUndefined());
	return JSValue::encode(loader->resolve(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2)));
	}

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderResolveSync, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
	if (!loader)
	return JSValue::encode(jsUndefined());
	auto result = loader->resolveSync(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2));
	RETURN_IF_EXCEPTION(scope, encodedJSValue());
	return JSValue::encode(identifierToJSValue(vm, result));
	}

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderFetch, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	// Hook point, Loader.fetch
	// https://whatwg.github.io/loader/#browser-fetch
	// Take the key and fetch the resource actually.
	// For example, JavaScriptCore shell can provide the hook fetching the resource
	// from the local file system.
	JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
	if (!loader)
	return JSValue::encode(jsUndefined());
	return JSValue::encode(loader->fetch(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2)));
	}

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderGetModuleNamespaceObject, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
	if (!loader)
	return JSValue::encode(jsUndefined());
	auto* moduleNamespaceObject = loader->getModuleNamespaceObject(globalObject, callFrame->argument(0));
	RETURN_IF_EXCEPTION(scope, encodedJSValue());
	return JSValue::encode(moduleNamespaceObject);
	}

	// ------------------- Additional Hook Functions ---------------------------

	JSC_DEFINE_HOST_FUNCTION(moduleLoaderEvaluate, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	// To instrument and retrieve the errors raised from the module execution,
	// we inserted the hook point here.

	VM& vm = globalObject->vm();
	JSModuleLoader* loader = jsDynamicCast<JSModuleLoader*>(vm, callFrame->thisValue());
	if (!loader)
	return JSValue::encode(jsUndefined());
	return JSValue::encode(loader->evaluate(globalObject, callFrame->argument(0), callFrame->argument(1), callFrame->argument(2), callFrame->argument(3), callFrame->argument(4)));
	}

	} // namespace JSC