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diff --git a/Source/JavaScriptCore/runtime/JSModuleNamespaceObject.cpp b/Source/JavaScriptCore/runtime/JSModuleNamespaceObject.cpp
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+/*
+ * Copyright (C) 2015-2016 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. ``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 "JSModuleNamespaceObject.h"
+
+#include "AbstractModuleRecord.h"
+#include "Error.h"
+#include "JSCInlines.h"
+#include "JSModuleEnvironment.h"
+
+namespace JSC {
+
+const ClassInfo JSModuleNamespaceObject::s_info = { "ModuleNamespaceObject", &Base::s_info, nullptr, CREATE_METHOD_TABLE(JSModuleNamespaceObject) };
+
+JSModuleNamespaceObject::JSModuleNamespaceObject(VM& vm, Structure* structure)
+ : Base(vm, structure)
+ , m_exports()
+{
+}
+
+void JSModuleNamespaceObject::finishCreation(ExecState* exec, JSGlobalObject*, AbstractModuleRecord* moduleRecord, Vector<std::pair<Identifier, AbstractModuleRecord::Resolution>>&& resolutions)
+{
+ VM& vm = exec->vm();
+ auto scope = DECLARE_THROW_SCOPE(vm);
+ Base::finishCreation(vm);
+ ASSERT(inherits(vm, info()));
+
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects
+ // Quoted from the spec:
+ // A List containing the String values of the exported names exposed as own properties of this object.
+ // The list is ordered as if an Array of those String values had been sorted using Array.prototype.sort using SortCompare as comparefn.
+ //
+ // Sort the exported names by the code point order.
+ std::sort(resolutions.begin(), resolutions.end(), [] (const auto& lhs, const auto& rhs) {
+ return codePointCompare(lhs.first.impl(), rhs.first.impl()) < 0;
+ });
+
+ m_moduleRecord.set(vm, this, moduleRecord);
+ {
+ unsigned moduleRecordOffset = 0;
+ m_names.reserveCapacity(resolutions.size());
+ for (const auto& pair : resolutions) {
+ moduleRecordAt(moduleRecordOffset).set(vm, this, pair.second.moduleRecord);
+ m_names.append(pair.first);
+ m_exports.add(pair.first.impl(), ExportEntry {
+ pair.second.localName,
+ moduleRecordOffset
+ });
+ ++moduleRecordOffset;
+ }
+ }
+
+ putDirect(vm, vm.propertyNames->toStringTagSymbol, jsString(&vm, "Module"), DontEnum | DontDelete | ReadOnly);
+
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-getprototypeof
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-setprototypeof-v
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-isextensible
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-preventextensions
+ methodTable(vm)->preventExtensions(this, exec);
+ ASSERT_UNUSED(scope, !scope.exception());
+}
+
+void JSModuleNamespaceObject::destroy(JSCell* cell)
+{
+ JSModuleNamespaceObject* thisObject = static_cast<JSModuleNamespaceObject*>(cell);
+ thisObject->JSModuleNamespaceObject::~JSModuleNamespaceObject();
+}
+
+void JSModuleNamespaceObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
+{
+ JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
+ ASSERT_GC_OBJECT_INHERITS(thisObject, info());
+ Base::visitChildren(thisObject, visitor);
+ visitor.append(thisObject->m_moduleRecord);
+ for (unsigned i = 0; i < thisObject->m_names.size(); ++i)
+ visitor.appendHidden(thisObject->moduleRecordAt(i));
+}
+
+static JSValue getValue(JSModuleEnvironment* environment, PropertyName localName, ScopeOffset& scopeOffset)
+{
+ SymbolTable* symbolTable = environment->symbolTable();
+ {
+ ConcurrentJSLocker locker(symbolTable->m_lock);
+ auto iter = symbolTable->find(locker, localName.uid());
+ ASSERT(iter != symbolTable->end(locker));
+ SymbolTableEntry& entry = iter->value;
+ ASSERT(!entry.isNull());
+ scopeOffset = entry.scopeOffset();
+ }
+ return environment->variableAt(scopeOffset).get();
+}
+
+bool JSModuleNamespaceObject::getOwnPropertySlot(JSObject* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
+{
+ VM& vm = exec->vm();
+ auto scope = DECLARE_THROW_SCOPE(vm);
+
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-getownproperty-p
+
+ JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
+
+ // step 1.
+ // If the property name is a symbol, we don't look into the imported bindings.
+ // It may return the descriptor with writable: true, but namespace objects does not allow it in [[Set]] / [[DefineOwnProperty]] side.
+ if (propertyName.isSymbol())
+ return JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot);
+
+ slot.setIsTaintedByOpaqueObject();
+
+ auto iterator = thisObject->m_exports.find(propertyName.uid());
+ if (iterator == thisObject->m_exports.end())
+ return false;
+ ExportEntry& exportEntry = iterator->value;
+
+ switch (slot.internalMethodType()) {
+ case PropertySlot::InternalMethodType::GetOwnProperty:
+ case PropertySlot::InternalMethodType::Get: {
+ JSModuleEnvironment* environment = thisObject->moduleRecordAt(exportEntry.moduleRecordOffset)->moduleEnvironment();
+ ScopeOffset scopeOffset;
+ JSValue value = getValue(environment, exportEntry.localName, scopeOffset);
+ // If the value is filled with TDZ value, throw a reference error.
+ if (!value) {
+ throwVMError(exec, scope, createTDZError(exec));
+ return false;
+ }
+
+ slot.setValueModuleNamespace(thisObject, DontDelete, value, environment, scopeOffset);
+ return true;
+ }
+
+ case PropertySlot::InternalMethodType::HasProperty: {
+ // Do not perform [[Get]] for [[HasProperty]].
+ // [[Get]] / [[GetOwnProperty]] onto namespace object could throw an error while [[HasProperty]] just returns true here.
+ // https://tc39.github.io/ecma262/#sec-module-namespace-exotic-objects-hasproperty-p
+ slot.setValue(thisObject, DontDelete, jsUndefined());
+ return true;
+ }
+
+ case PropertySlot::InternalMethodType::VMInquiry:
+ return false;
+ }
+
+ RELEASE_ASSERT_NOT_REACHED();
+ return false;
+}
+
+bool JSModuleNamespaceObject::put(JSCell*, ExecState* exec, PropertyName, JSValue, PutPropertySlot& slot)
+{
+ VM& vm = exec->vm();
+ auto scope = DECLARE_THROW_SCOPE(vm);
+
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-set-p-v-receiver
+ if (slot.isStrictMode())
+ throwTypeError(exec, scope, ASCIILiteral(ReadonlyPropertyWriteError));
+ return false;
+}
+
+bool JSModuleNamespaceObject::putByIndex(JSCell*, ExecState* exec, unsigned, JSValue, bool shouldThrow)
+{
+ VM& vm = exec->vm();
+ auto scope = DECLARE_THROW_SCOPE(vm);
+
+ if (shouldThrow)
+ throwTypeError(exec, scope, ASCIILiteral(ReadonlyPropertyWriteError));
+ return false;
+}
+
+bool JSModuleNamespaceObject::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
+{
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-delete-p
+ JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
+ if (propertyName.isSymbol())
+ return JSObject::deleteProperty(thisObject, exec, propertyName);
+
+ return !thisObject->m_exports.contains(propertyName.uid());
+}
+
+void JSModuleNamespaceObject::getOwnPropertyNames(JSObject* cell, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-ownpropertykeys
+ JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
+ for (const auto& name : thisObject->m_names)
+ propertyNames.add(name.impl());
+ return JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
+}
+
+bool JSModuleNamespaceObject::defineOwnProperty(JSObject*, ExecState* exec, PropertyName, const PropertyDescriptor&, bool shouldThrow)
+{
+ VM& vm = exec->vm();
+ auto scope = DECLARE_THROW_SCOPE(vm);
+
+ // http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-defineownproperty-p-desc
+ if (shouldThrow)
+ throwTypeError(exec, scope, ASCIILiteral(NonExtensibleObjectPropertyDefineError));
+ return false;
+}
+
+} // namespace JSC