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-rw-r--r--js/src/builtin/ModuleObject.cpp2676
1 files changed, 2676 insertions, 0 deletions
diff --git a/js/src/builtin/ModuleObject.cpp b/js/src/builtin/ModuleObject.cpp
new file mode 100644
index 0000000000..9800ebfe56
--- /dev/null
+++ b/js/src/builtin/ModuleObject.cpp
@@ -0,0 +1,2676 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "builtin/ModuleObject.h"
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/EnumSet.h"
+#include "mozilla/ScopeExit.h"
+
+#include "builtin/Promise.h"
+#include "builtin/SelfHostingDefines.h"
+#include "frontend/ParseNode.h"
+#include "frontend/SharedContext.h"
+#include "gc/FreeOp.h"
+#include "gc/Policy.h"
+#include "gc/Tracer.h"
+#include "js/friend/ErrorMessages.h" // JSMSG_*
+#include "js/Modules.h" // JS::GetModulePrivate, JS::ModuleDynamicImportHook
+#include "js/PropertySpec.h"
+#include "vm/AsyncFunction.h"
+#include "vm/AsyncIteration.h"
+#include "vm/EqualityOperations.h" // js::SameValue
+#include "vm/ModuleBuilder.h" // js::ModuleBuilder
+#include "vm/PlainObject.h" // js::PlainObject
+#include "vm/PromiseObject.h" // js::PromiseObject
+#include "vm/SelfHosting.h"
+#include "vm/SharedStencil.h" // js::GCThingIndex
+
+#include "builtin/HandlerFunction-inl.h" // js::ExtraValueFromHandler, js::NewHandler{,WithExtraValue}, js::TargetFromHandler
+#include "vm/JSObject-inl.h"
+#include "vm/JSScript-inl.h"
+#include "vm/List-inl.h"
+#include "vm/NativeObject-inl.h"
+
+using namespace js;
+
+static_assert(MODULE_STATUS_UNLINKED < MODULE_STATUS_LINKING &&
+ MODULE_STATUS_LINKING < MODULE_STATUS_LINKED &&
+ MODULE_STATUS_LINKED < MODULE_STATUS_EVALUATED &&
+ MODULE_STATUS_EVALUATED < MODULE_STATUS_EVALUATED_ERROR,
+ "Module statuses are ordered incorrectly");
+
+template <typename T, Value ValueGetter(const T* obj)>
+static bool ModuleValueGetterImpl(JSContext* cx, const CallArgs& args) {
+ args.rval().set(ValueGetter(&args.thisv().toObject().as<T>()));
+ return true;
+}
+
+template <typename T, Value ValueGetter(const T* obj)>
+static bool ModuleValueGetter(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return CallNonGenericMethod<T::isInstance,
+ ModuleValueGetterImpl<T, ValueGetter>>(cx, args);
+}
+
+#define DEFINE_GETTER_FUNCTIONS(cls, name, slot) \
+ static Value cls##_##name##Value(const cls* obj) { \
+ return obj->getReservedSlot(cls::slot); \
+ } \
+ \
+ static bool cls##_##name##Getter(JSContext* cx, unsigned argc, Value* vp) { \
+ return ModuleValueGetter<cls, cls##_##name##Value>(cx, argc, vp); \
+ }
+
+#define DEFINE_ATOM_ACCESSOR_METHOD(cls, name) \
+ JSAtom* cls::name() const { \
+ Value value = cls##_##name##Value(this); \
+ return &value.toString()->asAtom(); \
+ }
+
+#define DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(cls, name) \
+ JSAtom* cls::name() const { \
+ Value value = cls##_##name##Value(this); \
+ if (value.isNull()) return nullptr; \
+ return &value.toString()->asAtom(); \
+ }
+
+#define DEFINE_UINT32_ACCESSOR_METHOD(cls, name) \
+ uint32_t cls::name() const { \
+ Value value = cls##_##name##Value(this); \
+ MOZ_ASSERT(value.toNumber() >= 0); \
+ if (value.isInt32()) return value.toInt32(); \
+ return JS::ToUint32(value.toDouble()); \
+ }
+
+///////////////////////////////////////////////////////////////////////////
+// ImportEntryObject
+
+/* static */ const JSClass ImportEntryObject::class_ = {
+ "ImportEntry", JSCLASS_HAS_RESERVED_SLOTS(ImportEntryObject::SlotCount)};
+
+DEFINE_GETTER_FUNCTIONS(ImportEntryObject, moduleRequest, ModuleRequestSlot)
+DEFINE_GETTER_FUNCTIONS(ImportEntryObject, importName, ImportNameSlot)
+DEFINE_GETTER_FUNCTIONS(ImportEntryObject, localName, LocalNameSlot)
+DEFINE_GETTER_FUNCTIONS(ImportEntryObject, lineNumber, LineNumberSlot)
+DEFINE_GETTER_FUNCTIONS(ImportEntryObject, columnNumber, ColumnNumberSlot)
+
+DEFINE_ATOM_ACCESSOR_METHOD(ImportEntryObject, moduleRequest)
+DEFINE_ATOM_ACCESSOR_METHOD(ImportEntryObject, importName)
+DEFINE_ATOM_ACCESSOR_METHOD(ImportEntryObject, localName)
+DEFINE_UINT32_ACCESSOR_METHOD(ImportEntryObject, lineNumber)
+DEFINE_UINT32_ACCESSOR_METHOD(ImportEntryObject, columnNumber)
+
+/* static */
+bool ImportEntryObject::isInstance(HandleValue value) {
+ return value.isObject() && value.toObject().is<ImportEntryObject>();
+}
+
+/* static */
+bool GlobalObject::initImportEntryProto(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ static const JSPropertySpec protoAccessors[] = {
+ JS_PSG("moduleRequest", ImportEntryObject_moduleRequestGetter, 0),
+ JS_PSG("importName", ImportEntryObject_importNameGetter, 0),
+ JS_PSG("localName", ImportEntryObject_localNameGetter, 0),
+ JS_PSG("lineNumber", ImportEntryObject_lineNumberGetter, 0),
+ JS_PSG("columnNumber", ImportEntryObject_columnNumberGetter, 0),
+ JS_PS_END};
+
+ RootedObject proto(
+ cx, GlobalObject::createBlankPrototype<PlainObject>(cx, global));
+ if (!proto) {
+ return false;
+ }
+
+ if (!DefinePropertiesAndFunctions(cx, proto, protoAccessors, nullptr)) {
+ return false;
+ }
+
+ global->initReservedSlot(IMPORT_ENTRY_PROTO, ObjectValue(*proto));
+ return true;
+}
+
+/* static */
+ImportEntryObject* ImportEntryObject::create(
+ JSContext* cx, HandleAtom moduleRequest, HandleAtom importName,
+ HandleAtom localName, uint32_t lineNumber, uint32_t columnNumber) {
+ RootedObject proto(
+ cx, GlobalObject::getOrCreateImportEntryPrototype(cx, cx->global()));
+ if (!proto) {
+ return nullptr;
+ }
+
+ ImportEntryObject* self =
+ NewObjectWithGivenProto<ImportEntryObject>(cx, proto);
+ if (!self) {
+ return nullptr;
+ }
+
+ self->initReservedSlot(ModuleRequestSlot, StringValue(moduleRequest));
+ self->initReservedSlot(ImportNameSlot, StringValue(importName));
+ self->initReservedSlot(LocalNameSlot, StringValue(localName));
+ self->initReservedSlot(LineNumberSlot, NumberValue(lineNumber));
+ self->initReservedSlot(ColumnNumberSlot, NumberValue(columnNumber));
+ return self;
+}
+
+///////////////////////////////////////////////////////////////////////////
+// ExportEntryObject
+
+/* static */ const JSClass ExportEntryObject::class_ = {
+ "ExportEntry", JSCLASS_HAS_RESERVED_SLOTS(ExportEntryObject::SlotCount)};
+
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, exportName, ExportNameSlot)
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, moduleRequest, ModuleRequestSlot)
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, importName, ImportNameSlot)
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, localName, LocalNameSlot)
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, lineNumber, LineNumberSlot)
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, columnNumber, ColumnNumberSlot)
+
+DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, exportName)
+DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, moduleRequest)
+DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, importName)
+DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, localName)
+DEFINE_UINT32_ACCESSOR_METHOD(ExportEntryObject, lineNumber)
+DEFINE_UINT32_ACCESSOR_METHOD(ExportEntryObject, columnNumber)
+
+/* static */
+bool ExportEntryObject::isInstance(HandleValue value) {
+ return value.isObject() && value.toObject().is<ExportEntryObject>();
+}
+
+/* static */
+bool GlobalObject::initExportEntryProto(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ static const JSPropertySpec protoAccessors[] = {
+ JS_PSG("exportName", ExportEntryObject_exportNameGetter, 0),
+ JS_PSG("moduleRequest", ExportEntryObject_moduleRequestGetter, 0),
+ JS_PSG("importName", ExportEntryObject_importNameGetter, 0),
+ JS_PSG("localName", ExportEntryObject_localNameGetter, 0),
+ JS_PSG("lineNumber", ExportEntryObject_lineNumberGetter, 0),
+ JS_PSG("columnNumber", ExportEntryObject_columnNumberGetter, 0),
+ JS_PS_END};
+
+ RootedObject proto(
+ cx, GlobalObject::createBlankPrototype<PlainObject>(cx, global));
+ if (!proto) {
+ return false;
+ }
+
+ if (!DefinePropertiesAndFunctions(cx, proto, protoAccessors, nullptr)) {
+ return false;
+ }
+
+ global->initReservedSlot(EXPORT_ENTRY_PROTO, ObjectValue(*proto));
+ return true;
+}
+
+static Value StringOrNullValue(JSString* maybeString) {
+ return maybeString ? StringValue(maybeString) : NullValue();
+}
+
+/* static */
+ExportEntryObject* ExportEntryObject::create(
+ JSContext* cx, HandleAtom maybeExportName, HandleAtom maybeModuleRequest,
+ HandleAtom maybeImportName, HandleAtom maybeLocalName, uint32_t lineNumber,
+ uint32_t columnNumber) {
+ // Line and column numbers are optional for export entries since direct
+ // entries are checked at parse time.
+
+ RootedObject proto(
+ cx, GlobalObject::getOrCreateExportEntryPrototype(cx, cx->global()));
+ if (!proto) {
+ return nullptr;
+ }
+
+ ExportEntryObject* self =
+ NewObjectWithGivenProto<ExportEntryObject>(cx, proto);
+ if (!self) {
+ return nullptr;
+ }
+
+ self->initReservedSlot(ExportNameSlot, StringOrNullValue(maybeExportName));
+ self->initReservedSlot(ModuleRequestSlot,
+ StringOrNullValue(maybeModuleRequest));
+ self->initReservedSlot(ImportNameSlot, StringOrNullValue(maybeImportName));
+ self->initReservedSlot(LocalNameSlot, StringOrNullValue(maybeLocalName));
+ self->initReservedSlot(LineNumberSlot, NumberValue(lineNumber));
+ self->initReservedSlot(ColumnNumberSlot, NumberValue(columnNumber));
+ return self;
+}
+
+///////////////////////////////////////////////////////////////////////////
+// RequestedModuleObject
+
+/* static */ const JSClass RequestedModuleObject::class_ = {
+ "RequestedModule",
+ JSCLASS_HAS_RESERVED_SLOTS(RequestedModuleObject::SlotCount)};
+
+DEFINE_GETTER_FUNCTIONS(RequestedModuleObject, moduleSpecifier,
+ ModuleSpecifierSlot)
+DEFINE_GETTER_FUNCTIONS(RequestedModuleObject, lineNumber, LineNumberSlot)
+DEFINE_GETTER_FUNCTIONS(RequestedModuleObject, columnNumber, ColumnNumberSlot)
+
+DEFINE_ATOM_ACCESSOR_METHOD(RequestedModuleObject, moduleSpecifier)
+DEFINE_UINT32_ACCESSOR_METHOD(RequestedModuleObject, lineNumber)
+DEFINE_UINT32_ACCESSOR_METHOD(RequestedModuleObject, columnNumber)
+
+/* static */
+bool RequestedModuleObject::isInstance(HandleValue value) {
+ return value.isObject() && value.toObject().is<RequestedModuleObject>();
+}
+
+/* static */
+bool GlobalObject::initRequestedModuleProto(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ static const JSPropertySpec protoAccessors[] = {
+ JS_PSG("moduleSpecifier", RequestedModuleObject_moduleSpecifierGetter, 0),
+ JS_PSG("lineNumber", RequestedModuleObject_lineNumberGetter, 0),
+ JS_PSG("columnNumber", RequestedModuleObject_columnNumberGetter, 0),
+ JS_PS_END};
+
+ RootedObject proto(
+ cx, GlobalObject::createBlankPrototype<PlainObject>(cx, global));
+ if (!proto) {
+ return false;
+ }
+
+ if (!DefinePropertiesAndFunctions(cx, proto, protoAccessors, nullptr)) {
+ return false;
+ }
+
+ global->initReservedSlot(REQUESTED_MODULE_PROTO, ObjectValue(*proto));
+ return true;
+}
+
+/* static */
+RequestedModuleObject* RequestedModuleObject::create(JSContext* cx,
+ HandleAtom moduleSpecifier,
+ uint32_t lineNumber,
+ uint32_t columnNumber) {
+ RootedObject proto(
+ cx, GlobalObject::getOrCreateRequestedModulePrototype(cx, cx->global()));
+ if (!proto) {
+ return nullptr;
+ }
+
+ RequestedModuleObject* self =
+ NewObjectWithGivenProto<RequestedModuleObject>(cx, proto);
+ if (!self) {
+ return nullptr;
+ }
+
+ self->initReservedSlot(ModuleSpecifierSlot, StringValue(moduleSpecifier));
+ self->initReservedSlot(LineNumberSlot, NumberValue(lineNumber));
+ self->initReservedSlot(ColumnNumberSlot, NumberValue(columnNumber));
+ return self;
+}
+
+///////////////////////////////////////////////////////////////////////////
+// IndirectBindingMap
+
+IndirectBindingMap::Binding::Binding(ModuleEnvironmentObject* environment,
+ Shape* shape)
+ : environment(environment), shape(shape) {}
+
+void IndirectBindingMap::trace(JSTracer* trc) {
+ if (!map_) {
+ return;
+ }
+
+ for (Map::Enum e(*map_); !e.empty(); e.popFront()) {
+ Binding& b = e.front().value();
+ TraceEdge(trc, &b.environment, "module bindings environment");
+ TraceEdge(trc, &b.shape, "module bindings shape");
+ mozilla::DebugOnly<jsid> prev(e.front().key());
+ TraceEdge(trc, &e.front().mutableKey(), "module bindings binding name");
+ MOZ_ASSERT(e.front().key() == prev);
+ }
+}
+
+bool IndirectBindingMap::put(JSContext* cx, HandleId name,
+ HandleModuleEnvironmentObject environment,
+ HandleId localName) {
+ // This object might have been allocated on the background parsing thread in
+ // different zone to the final module. Lazily allocate the map so we don't
+ // have to switch its zone when merging realms.
+ if (!map_) {
+ MOZ_ASSERT(!cx->zone()->createdForHelperThread());
+ map_.emplace(cx->zone());
+ }
+
+ RootedShape shape(cx, environment->lookup(cx, localName));
+ MOZ_ASSERT(shape);
+ if (!map_->put(name, Binding(environment, shape))) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ return true;
+}
+
+bool IndirectBindingMap::lookup(jsid name, ModuleEnvironmentObject** envOut,
+ Shape** shapeOut) const {
+ if (!map_) {
+ return false;
+ }
+
+ auto ptr = map_->lookup(name);
+ if (!ptr) {
+ return false;
+ }
+
+ const Binding& binding = ptr->value();
+ MOZ_ASSERT(binding.environment);
+ MOZ_ASSERT(!binding.environment->inDictionaryMode());
+ MOZ_ASSERT(binding.environment->containsPure(binding.shape));
+ *envOut = binding.environment;
+ *shapeOut = binding.shape;
+ return true;
+}
+
+///////////////////////////////////////////////////////////////////////////
+// ModuleNamespaceObject
+
+/* static */
+const ModuleNamespaceObject::ProxyHandler ModuleNamespaceObject::proxyHandler;
+
+/* static */
+bool ModuleNamespaceObject::isInstance(HandleValue value) {
+ return value.isObject() && value.toObject().is<ModuleNamespaceObject>();
+}
+
+/* static */
+ModuleNamespaceObject* ModuleNamespaceObject::create(
+ JSContext* cx, HandleModuleObject module, HandleObject exports,
+ UniquePtr<IndirectBindingMap> bindings) {
+ RootedValue priv(cx, ObjectValue(*module));
+ ProxyOptions options;
+ options.setLazyProto(true);
+ Rooted<UniquePtr<IndirectBindingMap>> rootedBindings(cx, std::move(bindings));
+ RootedObject object(
+ cx, NewProxyObject(cx, &proxyHandler, priv, nullptr, options));
+ if (!object) {
+ return nullptr;
+ }
+
+ SetProxyReservedSlot(object, ExportsSlot, ObjectValue(*exports));
+ SetProxyReservedSlot(object, BindingsSlot,
+ PrivateValue(rootedBindings.release()));
+ AddCellMemory(object, sizeof(IndirectBindingMap),
+ MemoryUse::ModuleBindingMap);
+
+ return &object->as<ModuleNamespaceObject>();
+}
+
+ModuleObject& ModuleNamespaceObject::module() {
+ return GetProxyPrivate(this).toObject().as<ModuleObject>();
+}
+
+JSObject& ModuleNamespaceObject::exports() {
+ return GetProxyReservedSlot(this, ExportsSlot).toObject();
+}
+
+IndirectBindingMap& ModuleNamespaceObject::bindings() {
+ Value value = GetProxyReservedSlot(this, BindingsSlot);
+ auto bindings = static_cast<IndirectBindingMap*>(value.toPrivate());
+ MOZ_ASSERT(bindings);
+ return *bindings;
+}
+
+bool ModuleNamespaceObject::hasBindings() const {
+ // Import bindings may not be present if we hit OOM in initialization.
+ return !GetProxyReservedSlot(this, BindingsSlot).isUndefined();
+}
+
+bool ModuleNamespaceObject::addBinding(JSContext* cx, HandleAtom exportedName,
+ HandleModuleObject targetModule,
+ HandleAtom localName) {
+ RootedModuleEnvironmentObject environment(
+ cx, &targetModule->initialEnvironment());
+ RootedId exportedNameId(cx, AtomToId(exportedName));
+ RootedId localNameId(cx, AtomToId(localName));
+ return bindings().put(cx, exportedNameId, environment, localNameId);
+}
+
+const char ModuleNamespaceObject::ProxyHandler::family = 0;
+
+ModuleNamespaceObject::ProxyHandler::ProxyHandler()
+ : BaseProxyHandler(&family, false) {}
+
+bool ModuleNamespaceObject::ProxyHandler::getPrototype(
+ JSContext* cx, HandleObject proxy, MutableHandleObject protop) const {
+ protop.set(nullptr);
+ return true;
+}
+
+bool ModuleNamespaceObject::ProxyHandler::setPrototype(
+ JSContext* cx, HandleObject proxy, HandleObject proto,
+ ObjectOpResult& result) const {
+ if (!proto) {
+ return result.succeed();
+ }
+ return result.failCantSetProto();
+}
+
+bool ModuleNamespaceObject::ProxyHandler::getPrototypeIfOrdinary(
+ JSContext* cx, HandleObject proxy, bool* isOrdinary,
+ MutableHandleObject protop) const {
+ *isOrdinary = false;
+ return true;
+}
+
+bool ModuleNamespaceObject::ProxyHandler::setImmutablePrototype(
+ JSContext* cx, HandleObject proxy, bool* succeeded) const {
+ *succeeded = true;
+ return true;
+}
+
+bool ModuleNamespaceObject::ProxyHandler::isExtensible(JSContext* cx,
+ HandleObject proxy,
+ bool* extensible) const {
+ *extensible = false;
+ return true;
+}
+
+bool ModuleNamespaceObject::ProxyHandler::preventExtensions(
+ JSContext* cx, HandleObject proxy, ObjectOpResult& result) const {
+ result.succeed();
+ return true;
+}
+
+bool ModuleNamespaceObject::ProxyHandler::getOwnPropertyDescriptor(
+ JSContext* cx, HandleObject proxy, HandleId id,
+ MutableHandle<PropertyDescriptor> desc) const {
+ Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
+ if (JSID_IS_SYMBOL(id)) {
+ if (JSID_TO_SYMBOL(id) == cx->wellKnownSymbols().toStringTag) {
+ RootedValue value(cx, StringValue(cx->names().Module));
+ desc.object().set(proxy);
+ desc.setWritable(false);
+ desc.setEnumerable(false);
+ desc.setConfigurable(false);
+ desc.setValue(value);
+ return true;
+ }
+
+ return true;
+ }
+
+ const IndirectBindingMap& bindings = ns->bindings();
+ ModuleEnvironmentObject* env;
+ Shape* shape;
+ if (!bindings.lookup(id, &env, &shape)) {
+ return true;
+ }
+
+ RootedValue value(cx, env->getSlot(shape->slot()));
+ if (value.isMagic(JS_UNINITIALIZED_LEXICAL)) {
+ ReportRuntimeLexicalError(cx, JSMSG_UNINITIALIZED_LEXICAL, id);
+ return false;
+ }
+
+ desc.object().set(env);
+ desc.setConfigurable(false);
+ desc.setEnumerable(true);
+ desc.setValue(value);
+ return true;
+}
+
+static bool ValidatePropertyDescriptor(
+ JSContext* cx, Handle<PropertyDescriptor> desc, bool expectedWritable,
+ bool expectedEnumerable, bool expectedConfigurable,
+ HandleValue expectedValue, ObjectOpResult& result) {
+ if (desc.isAccessorDescriptor()) {
+ return result.fail(JSMSG_CANT_REDEFINE_PROP);
+ }
+
+ if (desc.hasWritable() && desc.writable() != expectedWritable) {
+ return result.fail(JSMSG_CANT_REDEFINE_PROP);
+ }
+
+ if (desc.hasEnumerable() && desc.enumerable() != expectedEnumerable) {
+ return result.fail(JSMSG_CANT_REDEFINE_PROP);
+ }
+
+ if (desc.hasConfigurable() && desc.configurable() != expectedConfigurable) {
+ return result.fail(JSMSG_CANT_REDEFINE_PROP);
+ }
+
+ if (desc.hasValue()) {
+ bool same;
+ if (!SameValue(cx, desc.value(), expectedValue, &same)) {
+ return false;
+ }
+ if (!same) {
+ return result.fail(JSMSG_CANT_REDEFINE_PROP);
+ }
+ }
+
+ return result.succeed();
+}
+
+bool ModuleNamespaceObject::ProxyHandler::defineProperty(
+ JSContext* cx, HandleObject proxy, HandleId id,
+ Handle<PropertyDescriptor> desc, ObjectOpResult& result) const {
+ if (JSID_IS_SYMBOL(id)) {
+ if (JSID_TO_SYMBOL(id) == cx->wellKnownSymbols().toStringTag) {
+ RootedValue value(cx, StringValue(cx->names().Module));
+ return ValidatePropertyDescriptor(cx, desc, false, false, false, value,
+ result);
+ }
+ return result.fail(JSMSG_CANT_DEFINE_PROP_OBJECT_NOT_EXTENSIBLE);
+ }
+
+ const IndirectBindingMap& bindings =
+ proxy->as<ModuleNamespaceObject>().bindings();
+ ModuleEnvironmentObject* env;
+ Shape* shape;
+ if (!bindings.lookup(id, &env, &shape)) {
+ return result.fail(JSMSG_CANT_DEFINE_PROP_OBJECT_NOT_EXTENSIBLE);
+ }
+
+ RootedValue value(cx, env->getSlot(shape->slot()));
+ if (value.isMagic(JS_UNINITIALIZED_LEXICAL)) {
+ ReportRuntimeLexicalError(cx, JSMSG_UNINITIALIZED_LEXICAL, id);
+ return false;
+ }
+
+ return ValidatePropertyDescriptor(cx, desc, true, true, false, value, result);
+}
+
+bool ModuleNamespaceObject::ProxyHandler::has(JSContext* cx, HandleObject proxy,
+ HandleId id, bool* bp) const {
+ Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
+ if (JSID_IS_SYMBOL(id)) {
+ *bp = JSID_TO_SYMBOL(id) == cx->wellKnownSymbols().toStringTag;
+ return true;
+ }
+
+ *bp = ns->bindings().has(id);
+ return true;
+}
+
+bool ModuleNamespaceObject::ProxyHandler::get(JSContext* cx, HandleObject proxy,
+ HandleValue receiver, HandleId id,
+ MutableHandleValue vp) const {
+ Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
+ if (JSID_IS_SYMBOL(id)) {
+ if (JSID_TO_SYMBOL(id) == cx->wellKnownSymbols().toStringTag) {
+ vp.setString(cx->names().Module);
+ return true;
+ }
+
+ vp.setUndefined();
+ return true;
+ }
+
+ ModuleEnvironmentObject* env;
+ Shape* shape;
+ if (!ns->bindings().lookup(id, &env, &shape)) {
+ vp.setUndefined();
+ return true;
+ }
+
+ RootedValue value(cx, env->getSlot(shape->slot()));
+ if (value.isMagic(JS_UNINITIALIZED_LEXICAL)) {
+ ReportRuntimeLexicalError(cx, JSMSG_UNINITIALIZED_LEXICAL, id);
+ return false;
+ }
+
+ vp.set(value);
+ return true;
+}
+
+bool ModuleNamespaceObject::ProxyHandler::set(JSContext* cx, HandleObject proxy,
+ HandleId id, HandleValue v,
+ HandleValue receiver,
+ ObjectOpResult& result) const {
+ return result.failReadOnly();
+}
+
+bool ModuleNamespaceObject::ProxyHandler::delete_(
+ JSContext* cx, HandleObject proxy, HandleId id,
+ ObjectOpResult& result) const {
+ Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
+ if (JSID_IS_SYMBOL(id)) {
+ if (JSID_TO_SYMBOL(id) == cx->wellKnownSymbols().toStringTag) {
+ return result.failCantDelete();
+ }
+
+ return result.succeed();
+ }
+
+ if (ns->bindings().has(id)) {
+ return result.failCantDelete();
+ }
+
+ return result.succeed();
+}
+
+bool ModuleNamespaceObject::ProxyHandler::ownPropertyKeys(
+ JSContext* cx, HandleObject proxy, MutableHandleIdVector props) const {
+ Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
+ RootedObject exports(cx, &ns->exports());
+ uint32_t count;
+ if (!GetLengthProperty(cx, exports, &count) ||
+ !props.reserve(props.length() + count + 1)) {
+ return false;
+ }
+
+ Rooted<ValueVector> names(cx, ValueVector(cx));
+ if (!names.resize(count) || !GetElements(cx, exports, count, names.begin())) {
+ return false;
+ }
+
+ for (uint32_t i = 0; i < count; i++) {
+ props.infallibleAppend(AtomToId(&names[i].toString()->asAtom()));
+ }
+
+ props.infallibleAppend(SYMBOL_TO_JSID(cx->wellKnownSymbols().toStringTag));
+
+ return true;
+}
+
+void ModuleNamespaceObject::ProxyHandler::trace(JSTracer* trc,
+ JSObject* proxy) const {
+ auto& self = proxy->as<ModuleNamespaceObject>();
+
+ if (self.hasBindings()) {
+ self.bindings().trace(trc);
+ }
+}
+
+void ModuleNamespaceObject::ProxyHandler::finalize(JSFreeOp* fop,
+ JSObject* proxy) const {
+ auto& self = proxy->as<ModuleNamespaceObject>();
+
+ if (self.hasBindings()) {
+ fop->delete_(proxy, &self.bindings(), MemoryUse::ModuleBindingMap);
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////
+// ModuleObject
+
+/* static */ const JSClassOps ModuleObject::classOps_ = {
+ nullptr, // addProperty
+ nullptr, // delProperty
+ nullptr, // enumerate
+ nullptr, // newEnumerate
+ nullptr, // resolve
+ nullptr, // mayResolve
+ ModuleObject::finalize, // finalize
+ nullptr, // call
+ nullptr, // hasInstance
+ nullptr, // construct
+ ModuleObject::trace, // trace
+};
+
+/* static */ const JSClass ModuleObject::class_ = {
+ "Module",
+ JSCLASS_HAS_RESERVED_SLOTS(ModuleObject::SlotCount) |
+ JSCLASS_BACKGROUND_FINALIZE,
+ &ModuleObject::classOps_};
+
+#define DEFINE_ARRAY_SLOT_ACCESSOR(cls, name, slot) \
+ ArrayObject& cls::name() const { \
+ return getReservedSlot(cls::slot).toObject().as<ArrayObject>(); \
+ }
+
+DEFINE_ARRAY_SLOT_ACCESSOR(ModuleObject, requestedModules, RequestedModulesSlot)
+DEFINE_ARRAY_SLOT_ACCESSOR(ModuleObject, importEntries, ImportEntriesSlot)
+DEFINE_ARRAY_SLOT_ACCESSOR(ModuleObject, localExportEntries,
+ LocalExportEntriesSlot)
+DEFINE_ARRAY_SLOT_ACCESSOR(ModuleObject, indirectExportEntries,
+ IndirectExportEntriesSlot)
+DEFINE_ARRAY_SLOT_ACCESSOR(ModuleObject, starExportEntries,
+ StarExportEntriesSlot)
+
+/* static */
+bool ModuleObject::isInstance(HandleValue value) {
+ return value.isObject() && value.toObject().is<ModuleObject>();
+}
+
+// Declared as static function instead of ModuleObject method in order to
+// avoid recursive #include dependency between frontend and VM.
+static frontend::FunctionDeclarationVector* GetFunctionDeclarations(
+ ModuleObject* module) {
+ Value value = module->getReservedSlot(ModuleObject::FunctionDeclarationsSlot);
+ if (value.isUndefined()) {
+ return nullptr;
+ }
+
+ return static_cast<frontend::FunctionDeclarationVector*>(value.toPrivate());
+}
+
+static void InitFunctionDeclarations(
+ ModuleObject* module, frontend::FunctionDeclarationVector&& decls) {
+ *GetFunctionDeclarations(module) = std::move(decls);
+}
+
+/* static */
+ModuleObject* ModuleObject::create(JSContext* cx) {
+ RootedObject proto(
+ cx, GlobalObject::getOrCreateModulePrototype(cx, cx->global()));
+ if (!proto) {
+ return nullptr;
+ }
+
+ RootedModuleObject self(cx, NewObjectWithGivenProto<ModuleObject>(cx, proto));
+ if (!self) {
+ return nullptr;
+ }
+
+ IndirectBindingMap* bindings = cx->new_<IndirectBindingMap>();
+ if (!bindings) {
+ return nullptr;
+ }
+
+ InitReservedSlot(self, ImportBindingsSlot, bindings,
+ MemoryUse::ModuleBindingMap);
+
+ frontend::FunctionDeclarationVector* funDecls =
+ cx->new_<frontend::FunctionDeclarationVector>();
+ if (!funDecls) {
+ return nullptr;
+ }
+
+ self->initReservedSlot(FunctionDeclarationsSlot, PrivateValue(funDecls));
+ return self;
+}
+
+/* static */
+void ModuleObject::finalize(JSFreeOp* fop, JSObject* obj) {
+ MOZ_ASSERT(fop->maybeOnHelperThread());
+ ModuleObject* self = &obj->as<ModuleObject>();
+ if (self->hasImportBindings()) {
+ fop->delete_(obj, &self->importBindings(), MemoryUse::ModuleBindingMap);
+ }
+ if (frontend::FunctionDeclarationVector* funDecls =
+ GetFunctionDeclarations(self)) {
+ // Not tracked as these may move between zones on merge.
+ fop->deleteUntracked(funDecls);
+ }
+}
+
+ModuleEnvironmentObject& ModuleObject::initialEnvironment() const {
+ Value value = getReservedSlot(EnvironmentSlot);
+ return value.toObject().as<ModuleEnvironmentObject>();
+}
+
+ModuleEnvironmentObject* ModuleObject::environment() const {
+ // Note that this it's valid to call this even if there was an error
+ // evaluating the module.
+
+ // According to the spec the environment record is created during
+ // instantiation, but we create it earlier than that.
+ if (status() < MODULE_STATUS_LINKED) {
+ return nullptr;
+ }
+
+ return &initialEnvironment();
+}
+
+bool ModuleObject::hasImportBindings() const {
+ // Import bindings may not be present if we hit OOM in initialization.
+ return !getReservedSlot(ImportBindingsSlot).isUndefined();
+}
+
+IndirectBindingMap& ModuleObject::importBindings() {
+ return *static_cast<IndirectBindingMap*>(
+ getReservedSlot(ImportBindingsSlot).toPrivate());
+}
+
+ModuleNamespaceObject* ModuleObject::namespace_() {
+ Value value = getReservedSlot(NamespaceSlot);
+ if (value.isUndefined()) {
+ return nullptr;
+ }
+ return &value.toObject().as<ModuleNamespaceObject>();
+}
+
+ScriptSourceObject* ModuleObject::scriptSourceObject() const {
+ return &getReservedSlot(ScriptSourceObjectSlot)
+ .toObject()
+ .as<ScriptSourceObject>();
+}
+
+bool ModuleObject::initAsyncSlots(JSContext* cx, bool isAsync,
+ HandleObject asyncParentModulesList) {
+ initReservedSlot(AsyncSlot, BooleanValue(isAsync));
+ initReservedSlot(AsyncEvaluatingSlot, BooleanValue(false));
+ initReservedSlot(AsyncParentModulesSlot,
+ ObjectValue(*asyncParentModulesList));
+ return true;
+}
+
+void ModuleObject::initScriptSlots(HandleScript script) {
+ MOZ_ASSERT(script);
+ initReservedSlot(ScriptSlot, PrivateGCThingValue(script));
+ initReservedSlot(ScriptSourceObjectSlot,
+ ObjectValue(*script->sourceObject()));
+}
+
+void ModuleObject::setInitialEnvironment(
+ HandleModuleEnvironmentObject initialEnvironment) {
+ initReservedSlot(EnvironmentSlot, ObjectValue(*initialEnvironment));
+}
+
+void ModuleObject::initStatusSlot() {
+ initReservedSlot(StatusSlot, Int32Value(MODULE_STATUS_UNLINKED));
+}
+
+void ModuleObject::initImportExportData(HandleArrayObject requestedModules,
+ HandleArrayObject importEntries,
+ HandleArrayObject localExportEntries,
+ HandleArrayObject indirectExportEntries,
+ HandleArrayObject starExportEntries) {
+ initReservedSlot(RequestedModulesSlot, ObjectValue(*requestedModules));
+ initReservedSlot(ImportEntriesSlot, ObjectValue(*importEntries));
+ initReservedSlot(LocalExportEntriesSlot, ObjectValue(*localExportEntries));
+ initReservedSlot(IndirectExportEntriesSlot,
+ ObjectValue(*indirectExportEntries));
+ initReservedSlot(StarExportEntriesSlot, ObjectValue(*starExportEntries));
+}
+
+static bool FreezeObjectProperty(JSContext* cx, HandleNativeObject obj,
+ uint32_t slot) {
+ RootedObject property(cx, &obj->getSlot(slot).toObject());
+ return FreezeObject(cx, property);
+}
+
+/* static */
+bool ModuleObject::Freeze(JSContext* cx, HandleModuleObject self) {
+ return FreezeObjectProperty(cx, self, RequestedModulesSlot) &&
+ FreezeObjectProperty(cx, self, ImportEntriesSlot) &&
+ FreezeObjectProperty(cx, self, LocalExportEntriesSlot) &&
+ FreezeObjectProperty(cx, self, IndirectExportEntriesSlot) &&
+ FreezeObjectProperty(cx, self, StarExportEntriesSlot) &&
+ FreezeObject(cx, self);
+}
+
+#ifdef DEBUG
+
+static inline bool CheckObjectFrozen(JSContext* cx, HandleObject obj,
+ bool* result) {
+ return TestIntegrityLevel(cx, obj, IntegrityLevel::Frozen, result);
+}
+
+static inline bool CheckObjectPropertyFrozen(JSContext* cx,
+ HandleNativeObject obj,
+ uint32_t slot, bool* result) {
+ RootedObject property(cx, &obj->getSlot(slot).toObject());
+ return CheckObjectFrozen(cx, property, result);
+}
+
+/* static */ inline bool ModuleObject::AssertFrozen(JSContext* cx,
+ HandleModuleObject self) {
+ static const mozilla::EnumSet<ModuleSlot> slotsToCheck = {
+ RequestedModulesSlot, ImportEntriesSlot, LocalExportEntriesSlot,
+ IndirectExportEntriesSlot, StarExportEntriesSlot};
+
+ bool frozen = false;
+ for (auto slot : slotsToCheck) {
+ if (!CheckObjectPropertyFrozen(cx, self, slot, &frozen)) {
+ return false;
+ }
+ MOZ_ASSERT(frozen);
+ }
+
+ if (!CheckObjectFrozen(cx, self, &frozen)) {
+ return false;
+ }
+ MOZ_ASSERT(frozen);
+
+ return true;
+}
+
+#endif
+
+inline static void AssertModuleScopesMatch(ModuleObject* module) {
+ MOZ_ASSERT(module->enclosingScope()->is<GlobalScope>());
+ MOZ_ASSERT(IsGlobalLexicalEnvironment(
+ &module->initialEnvironment().enclosingEnvironment()));
+}
+
+void ModuleObject::fixEnvironmentsAfterRealmMerge() {
+ AssertModuleScopesMatch(this);
+ initialEnvironment().fixEnclosingEnvironmentAfterRealmMerge(
+ script()->global());
+ AssertModuleScopesMatch(this);
+}
+
+JSScript* ModuleObject::maybeScript() const {
+ Value value = getReservedSlot(ScriptSlot);
+ if (value.isUndefined()) {
+ return nullptr;
+ }
+ BaseScript* script = value.toGCThing()->as<BaseScript>();
+ MOZ_ASSERT(script->hasBytecode(),
+ "Module scripts should always have bytecode");
+ return script->asJSScript();
+}
+
+JSScript* ModuleObject::script() const {
+ JSScript* ptr = maybeScript();
+ MOZ_RELEASE_ASSERT(ptr);
+ return ptr;
+}
+
+static inline void AssertValidModuleStatus(ModuleStatus status) {
+ MOZ_ASSERT(status >= MODULE_STATUS_UNLINKED &&
+ status <= MODULE_STATUS_EVALUATED_ERROR);
+}
+
+ModuleStatus ModuleObject::status() const {
+ ModuleStatus status = getReservedSlot(StatusSlot).toInt32();
+ AssertValidModuleStatus(status);
+ return status;
+}
+
+bool ModuleObject::isAsync() const {
+ return getReservedSlot(AsyncSlot).toBoolean();
+}
+
+bool ModuleObject::isAsyncEvaluating() const {
+ return getReservedSlot(AsyncEvaluatingSlot).toBoolean();
+}
+
+void ModuleObject::setAsyncEvaluating(bool isEvaluating) {
+ return setReservedSlot(AsyncEvaluatingSlot, BooleanValue(isEvaluating));
+}
+
+uint32_t ModuleObject::dfsIndex() const {
+ return getReservedSlot(DFSIndexSlot).toInt32();
+}
+
+uint32_t ModuleObject::dfsAncestorIndex() const {
+ return getReservedSlot(DFSAncestorIndexSlot).toInt32();
+}
+
+JSObject* ModuleObject::topLevelCapability() const {
+ return &getReservedSlot(TopLevelCapabilitySlot).toObject();
+}
+
+PromiseObject* ModuleObject::createTopLevelCapability(
+ JSContext* cx, HandleModuleObject module) {
+ MOZ_ASSERT(module->getReservedSlot(TopLevelCapabilitySlot).isUndefined());
+ Rooted<PromiseObject*> resultPromise(cx, CreatePromiseObjectForAsync(cx));
+ if (!resultPromise) {
+ return nullptr;
+ }
+ module->setInitialTopLevelCapability(resultPromise);
+ return resultPromise;
+}
+
+void ModuleObject::setInitialTopLevelCapability(HandleObject promiseObj) {
+ initReservedSlot(TopLevelCapabilitySlot, ObjectValue(*promiseObj));
+}
+
+inline ListObject* ModuleObject::asyncParentModules() const {
+ return &getReservedSlot(AsyncParentModulesSlot).toObject().as<ListObject>();
+}
+
+bool ModuleObject::appendAsyncParentModule(JSContext* cx,
+ HandleModuleObject self,
+ HandleModuleObject parent) {
+ Rooted<Value> parentValue(cx, ObjectValue(*parent));
+ return self->asyncParentModules()->append(cx, parentValue);
+}
+
+uint32_t ModuleObject::pendingAsyncDependencies() const {
+ return getReservedSlot(PendingAsyncDependenciesSlot).toInt32();
+}
+
+void ModuleObject::setPendingAsyncDependencies(uint32_t newValue) {
+ return setReservedSlot(PendingAsyncDependenciesSlot, NumberValue(newValue));
+}
+
+bool ModuleObject::hasTopLevelCapability() const {
+ return !getReservedSlot(TopLevelCapabilitySlot).isUndefined();
+}
+
+bool ModuleObject::hadEvaluationError() const {
+ return status() == MODULE_STATUS_EVALUATED_ERROR;
+}
+
+void ModuleObject::setEvaluationError(HandleValue newValue) {
+ setReservedSlot(StatusSlot, Int32Value(MODULE_STATUS_EVALUATED_ERROR));
+ return setReservedSlot(EvaluationErrorSlot, newValue);
+}
+
+Value ModuleObject::evaluationError() const {
+ MOZ_ASSERT(hadEvaluationError());
+ return getReservedSlot(EvaluationErrorSlot);
+}
+
+JSObject* ModuleObject::metaObject() const {
+ Value value = getReservedSlot(MetaObjectSlot);
+ if (value.isObject()) {
+ return &value.toObject();
+ }
+
+ MOZ_ASSERT(value.isUndefined());
+ return nullptr;
+}
+
+void ModuleObject::setMetaObject(JSObject* obj) {
+ MOZ_ASSERT(obj);
+ MOZ_ASSERT(!metaObject());
+ setReservedSlot(MetaObjectSlot, ObjectValue(*obj));
+}
+
+Scope* ModuleObject::enclosingScope() const {
+ return script()->enclosingScope();
+}
+
+/* static */
+void ModuleObject::trace(JSTracer* trc, JSObject* obj) {
+ ModuleObject& module = obj->as<ModuleObject>();
+
+ if (module.hasImportBindings()) {
+ module.importBindings().trace(trc);
+ }
+}
+
+/* static */
+bool ModuleObject::instantiateFunctionDeclarations(JSContext* cx,
+ HandleModuleObject self) {
+#ifdef DEBUG
+ MOZ_ASSERT(self->status() == MODULE_STATUS_LINKING);
+ if (!AssertFrozen(cx, self)) {
+ return false;
+ }
+#endif
+ // |self| initially manages this vector.
+ frontend::FunctionDeclarationVector* funDecls =
+ GetFunctionDeclarations(self.get());
+ if (!funDecls) {
+ JS_ReportErrorASCII(
+ cx, "Module function declarations have already been instantiated");
+ return false;
+ }
+
+ RootedModuleEnvironmentObject env(cx, &self->initialEnvironment());
+ RootedObject obj(cx);
+ RootedValue value(cx);
+ RootedFunction fun(cx);
+ RootedPropertyName name(cx);
+
+ for (GCThingIndex funIndex : *funDecls) {
+ fun.set(self->script()->getFunction(funIndex));
+ obj = Lambda(cx, fun, env);
+ if (!obj) {
+ return false;
+ }
+
+ name = fun->explicitName()->asPropertyName();
+ value = ObjectValue(*obj);
+ if (!SetProperty(cx, env, name, value)) {
+ return false;
+ }
+ }
+
+ // Transfer ownership of the vector from |self|, then free the vector, once
+ // its contents are no longer needed.
+ self->setReservedSlot(FunctionDeclarationsSlot, UndefinedValue());
+ js_delete(funDecls);
+ return true;
+}
+
+/* static */
+bool ModuleObject::execute(JSContext* cx, HandleModuleObject self,
+ MutableHandleValue rval) {
+#ifdef DEBUG
+ MOZ_ASSERT(self->status() == MODULE_STATUS_EVALUATING ||
+ self->status() == MODULE_STATUS_EVALUATED);
+ if (!AssertFrozen(cx, self)) {
+ return false;
+ }
+#endif
+
+ RootedScript script(cx, self->script());
+
+ // The top-level script if a module is only ever executed once. Clear the
+ // reference at exit to prevent us keeping this alive unnecessarily. This is
+ // kept while executing so it is available to the debugger.
+ auto guardA = mozilla::MakeScopeExit(
+ [&] { self->setReservedSlot(ScriptSlot, UndefinedValue()); });
+
+ RootedModuleEnvironmentObject env(cx, self->environment());
+ if (!env) {
+ JS_ReportErrorASCII(cx,
+ "Module declarations have not yet been instantiated");
+ return false;
+ }
+
+ return Execute(cx, script, env, rval);
+}
+
+/* static */
+ModuleNamespaceObject* ModuleObject::createNamespace(JSContext* cx,
+ HandleModuleObject self,
+ HandleObject exports) {
+ MOZ_ASSERT(!self->namespace_());
+ MOZ_ASSERT(exports->is<ArrayObject>());
+
+ auto bindings = cx->make_unique<IndirectBindingMap>();
+ if (!bindings) {
+ return nullptr;
+ }
+
+ auto ns =
+ ModuleNamespaceObject::create(cx, self, exports, std::move(bindings));
+ if (!ns) {
+ return nullptr;
+ }
+
+ self->initReservedSlot(NamespaceSlot, ObjectValue(*ns));
+ return ns;
+}
+
+/* static */
+bool ModuleObject::createEnvironment(JSContext* cx, HandleModuleObject self) {
+ RootedModuleEnvironmentObject env(cx,
+ ModuleEnvironmentObject::create(cx, self));
+ if (!env) {
+ return false;
+ }
+
+ self->setInitialEnvironment(env);
+ return true;
+}
+
+static bool InvokeSelfHostedMethod(JSContext* cx, HandleModuleObject self,
+ HandlePropertyName name,
+ MutableHandleValue rval) {
+ RootedValue thisv(cx, ObjectValue(*self));
+ FixedInvokeArgs<0> args(cx);
+
+ return CallSelfHostedFunction(cx, name, thisv, args, rval);
+}
+
+/* static */
+bool ModuleObject::Instantiate(JSContext* cx, HandleModuleObject self) {
+ RootedValue ignored(cx);
+ return InvokeSelfHostedMethod(cx, self, cx->names().ModuleInstantiate,
+ &ignored);
+}
+
+/* static */
+bool ModuleObject::Evaluate(JSContext* cx, HandleModuleObject self,
+ MutableHandleValue rval) {
+ return InvokeSelfHostedMethod(cx, self, cx->names().ModuleEvaluate, rval);
+}
+
+/* static */
+ModuleNamespaceObject* ModuleObject::GetOrCreateModuleNamespace(
+ JSContext* cx, HandleModuleObject self) {
+ FixedInvokeArgs<1> args(cx);
+ args[0].setObject(*self);
+
+ RootedValue result(cx);
+ if (!CallSelfHostedFunction(cx, cx->names().GetModuleNamespace,
+ UndefinedHandleValue, args, &result)) {
+ return nullptr;
+ }
+
+ return &result.toObject().as<ModuleNamespaceObject>();
+}
+
+DEFINE_GETTER_FUNCTIONS(ModuleObject, namespace_, NamespaceSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, status, StatusSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, evaluationError, EvaluationErrorSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, requestedModules, RequestedModulesSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, importEntries, ImportEntriesSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, localExportEntries,
+ LocalExportEntriesSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, indirectExportEntries,
+ IndirectExportEntriesSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, starExportEntries, StarExportEntriesSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, dfsIndex, DFSIndexSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, dfsAncestorIndex, DFSAncestorIndexSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, async, AsyncSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, topLevelCapability,
+ TopLevelCapabilitySlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, asyncEvaluating, AsyncEvaluatingSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, asyncParentModules,
+ AsyncParentModulesSlot)
+DEFINE_GETTER_FUNCTIONS(ModuleObject, pendingAsyncDependencies,
+ PendingAsyncDependenciesSlot)
+
+/* static */
+bool GlobalObject::initModuleProto(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ static const JSPropertySpec protoAccessors[] = {
+ JS_PSG("namespace", ModuleObject_namespace_Getter, 0),
+ JS_PSG("status", ModuleObject_statusGetter, 0),
+ JS_PSG("evaluationError", ModuleObject_evaluationErrorGetter, 0),
+ JS_PSG("requestedModules", ModuleObject_requestedModulesGetter, 0),
+ JS_PSG("importEntries", ModuleObject_importEntriesGetter, 0),
+ JS_PSG("localExportEntries", ModuleObject_localExportEntriesGetter, 0),
+ JS_PSG("indirectExportEntries", ModuleObject_indirectExportEntriesGetter,
+ 0),
+ JS_PSG("starExportEntries", ModuleObject_starExportEntriesGetter, 0),
+ JS_PSG("dfsIndex", ModuleObject_dfsIndexGetter, 0),
+ JS_PSG("dfsAncestorIndex", ModuleObject_dfsAncestorIndexGetter, 0),
+ JS_PSG("async", ModuleObject_asyncGetter, 0),
+ JS_PSG("topLevelCapability", ModuleObject_topLevelCapabilityGetter, 0),
+ JS_PSG("asyncEvaluating", ModuleObject_asyncEvaluatingGetter, 0),
+ JS_PSG("asyncParentModules", ModuleObject_asyncParentModulesGetter, 0),
+ JS_PSG("pendingAsyncDependencies",
+ ModuleObject_pendingAsyncDependenciesGetter, 0),
+ JS_PS_END};
+
+ static const JSFunctionSpec protoFunctions[] = {
+ JS_SELF_HOSTED_FN("getExportedNames", "ModuleGetExportedNames", 1, 0),
+ JS_SELF_HOSTED_FN("resolveExport", "ModuleResolveExport", 2, 0),
+ JS_SELF_HOSTED_FN("declarationInstantiation", "ModuleInstantiate", 0, 0),
+ JS_SELF_HOSTED_FN("evaluation", "ModuleEvaluate", 0, 0), JS_FS_END};
+
+ RootedObject proto(
+ cx, GlobalObject::createBlankPrototype<PlainObject>(cx, global));
+ if (!proto) {
+ return false;
+ }
+
+ if (!DefinePropertiesAndFunctions(cx, proto, protoAccessors,
+ protoFunctions)) {
+ return false;
+ }
+
+ global->setReservedSlot(MODULE_PROTO, ObjectValue(*proto));
+ return true;
+}
+
+#undef DEFINE_GETTER_FUNCTIONS
+#undef DEFINE_STRING_ACCESSOR_METHOD
+#undef DEFINE_ARRAY_SLOT_ACCESSOR
+
+///////////////////////////////////////////////////////////////////////////
+// ModuleBuilder
+
+ModuleBuilder::ModuleBuilder(JSContext* cx,
+ const frontend::EitherParser& eitherParser)
+ : cx_(cx),
+ eitherParser_(eitherParser),
+ requestedModuleSpecifiers_(cx),
+ importEntries_(cx),
+ exportEntries_(cx),
+ exportNames_(cx) {}
+
+bool ModuleBuilder::noteFunctionDeclaration(JSContext* cx, uint32_t funIndex) {
+ if (!functionDecls_.emplaceBack(funIndex)) {
+ js::ReportOutOfMemory(cx);
+ return false;
+ }
+ return true;
+}
+
+void ModuleBuilder::noteAsync(frontend::StencilModuleMetadata& metadata) {
+ metadata.isAsync = true;
+}
+
+bool ModuleBuilder::buildTables(frontend::StencilModuleMetadata& metadata) {
+ // https://tc39.es/ecma262/#sec-parsemodule
+ // 15.2.1.17.1 ParseModule, Steps 4-11.
+
+ // Step 4.
+ metadata.requestedModules = std::move(requestedModules_);
+
+ // Step 5.
+ if (!metadata.importEntries.reserve(importEntries_.count())) {
+ js::ReportOutOfMemory(cx_);
+ return false;
+ }
+ for (auto r = importEntries_.all(); !r.empty(); r.popFront()) {
+ frontend::StencilModuleEntry& entry = r.front().value();
+ metadata.importEntries.infallibleAppend(entry);
+ }
+
+ // Steps 6-11.
+ for (const frontend::StencilModuleEntry& exp : exportEntries_) {
+ if (!exp.specifier) {
+ frontend::StencilModuleEntry* importEntry = importEntryFor(exp.localName);
+ if (!importEntry) {
+ if (!metadata.localExportEntries.append(exp)) {
+ js::ReportOutOfMemory(cx_);
+ return false;
+ }
+ } else {
+ if (importEntry->importName ==
+ frontend::TaggedParserAtomIndex::star()) {
+ if (!metadata.localExportEntries.append(exp)) {
+ js::ReportOutOfMemory(cx_);
+ return false;
+ }
+ } else {
+ // All names should have already been marked as used-by-stencil.
+ auto entry = frontend::StencilModuleEntry::exportFromEntry(
+ importEntry->specifier, importEntry->importName, exp.exportName,
+ exp.lineno, exp.column);
+ if (!metadata.indirectExportEntries.append(entry)) {
+ js::ReportOutOfMemory(cx_);
+ return false;
+ }
+ }
+ }
+ } else if (exp.importName == frontend::TaggedParserAtomIndex::star() &&
+ !exp.exportName) {
+ if (!metadata.starExportEntries.append(exp)) {
+ js::ReportOutOfMemory(cx_);
+ return false;
+ }
+ } else {
+ if (!metadata.indirectExportEntries.append(exp)) {
+ js::ReportOutOfMemory(cx_);
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+void ModuleBuilder::finishFunctionDecls(
+ frontend::StencilModuleMetadata& metadata) {
+ metadata.functionDecls = std::move(functionDecls_);
+}
+
+enum class ModuleArrayType {
+ ImportEntryObject,
+ ExportEntryObject,
+ RequestedModuleObject,
+};
+
+static ArrayObject* ModuleBuilderInitArray(
+ JSContext* cx, frontend::CompilationAtomCache& atomCache,
+ ModuleArrayType arrayType,
+ const frontend::StencilModuleMetadata::EntryVector& vector) {
+ RootedArrayObject resultArray(
+ cx, NewDenseFullyAllocatedArray(cx, vector.length()));
+ if (!resultArray) {
+ return nullptr;
+ }
+
+ resultArray->ensureDenseInitializedLength(0, vector.length());
+
+ RootedAtom specifier(cx);
+ RootedAtom localName(cx);
+ RootedAtom importName(cx);
+ RootedAtom exportName(cx);
+ RootedObject req(cx);
+
+ for (uint32_t i = 0; i < vector.length(); ++i) {
+ const frontend::StencilModuleEntry& entry = vector[i];
+
+ if (entry.specifier) {
+ specifier = atomCache.getExistingAtomAt(cx, entry.specifier);
+ MOZ_ASSERT(specifier);
+ }
+
+ if (entry.localName) {
+ localName = atomCache.getExistingAtomAt(cx, entry.localName);
+ MOZ_ASSERT(localName);
+ }
+
+ if (entry.importName) {
+ importName = atomCache.getExistingAtomAt(cx, entry.importName);
+ MOZ_ASSERT(importName);
+ }
+
+ if (entry.exportName) {
+ exportName = atomCache.getExistingAtomAt(cx, entry.exportName);
+ MOZ_ASSERT(exportName);
+ }
+
+ switch (arrayType) {
+ case ModuleArrayType::ImportEntryObject:
+ MOZ_ASSERT(localName && importName);
+ req = ImportEntryObject::create(cx, specifier, importName, localName,
+ entry.lineno, entry.column);
+ break;
+ case ModuleArrayType::ExportEntryObject:
+ MOZ_ASSERT(localName || importName || exportName);
+ req = ExportEntryObject::create(cx, exportName, specifier, importName,
+ localName, entry.lineno, entry.column);
+ break;
+ case ModuleArrayType::RequestedModuleObject:
+ req = RequestedModuleObject::create(cx, specifier, entry.lineno,
+ entry.column);
+ // TODO: Make this consistent with other object types.
+ if (req && !FreezeObject(cx, req)) {
+ return nullptr;
+ }
+ break;
+ }
+ if (!req) {
+ return nullptr;
+ }
+ resultArray->initDenseElement(i, ObjectValue(*req));
+ }
+
+ return resultArray;
+}
+
+// Use StencilModuleMetadata data to fill in ModuleObject
+bool frontend::StencilModuleMetadata::initModule(
+ JSContext* cx, frontend::CompilationAtomCache& atomCache,
+ JS::Handle<ModuleObject*> module) const {
+ RootedArrayObject requestedModulesObject(
+ cx, ModuleBuilderInitArray(cx, atomCache,
+ ModuleArrayType::RequestedModuleObject,
+ requestedModules));
+ if (!requestedModulesObject) {
+ return false;
+ }
+
+ RootedArrayObject importEntriesObject(
+ cx,
+ ModuleBuilderInitArray(cx, atomCache, ModuleArrayType::ImportEntryObject,
+ importEntries));
+ if (!importEntriesObject) {
+ return false;
+ }
+
+ RootedArrayObject localExportEntriesObject(
+ cx,
+ ModuleBuilderInitArray(cx, atomCache, ModuleArrayType::ExportEntryObject,
+ localExportEntries));
+ if (!localExportEntriesObject) {
+ return false;
+ }
+
+ RootedArrayObject indirectExportEntriesObject(
+ cx,
+ ModuleBuilderInitArray(cx, atomCache, ModuleArrayType::ExportEntryObject,
+ indirectExportEntries));
+ if (!indirectExportEntriesObject) {
+ return false;
+ }
+
+ RootedArrayObject starExportEntriesObject(
+ cx,
+ ModuleBuilderInitArray(cx, atomCache, ModuleArrayType::ExportEntryObject,
+ starExportEntries));
+ if (!starExportEntriesObject) {
+ return false;
+ }
+
+ // Copy the vector of declarations to the ModuleObject.
+ FunctionDeclarationVector functionDeclsCopy;
+ if (!functionDeclsCopy.appendAll(functionDecls)) {
+ js::ReportOutOfMemory(cx);
+ return false;
+ }
+ InitFunctionDeclarations(module.get(), std::move(functionDeclsCopy));
+
+ Rooted<ListObject*> asyncParentModulesList(cx, ListObject::create(cx));
+ if (!asyncParentModulesList) {
+ return false;
+ }
+
+ if (!module->initAsyncSlots(cx, isAsync, asyncParentModulesList)) {
+ return false;
+ }
+
+ module->initImportExportData(
+ requestedModulesObject, importEntriesObject, localExportEntriesObject,
+ indirectExportEntriesObject, starExportEntriesObject);
+
+ return true;
+}
+
+bool ModuleBuilder::processImport(frontend::BinaryNode* importNode) {
+ using namespace js::frontend;
+
+ MOZ_ASSERT(importNode->isKind(ParseNodeKind::ImportDecl));
+
+ ListNode* specList = &importNode->left()->as<ListNode>();
+ MOZ_ASSERT(specList->isKind(ParseNodeKind::ImportSpecList));
+
+ NameNode* moduleSpec = &importNode->right()->as<NameNode>();
+ MOZ_ASSERT(moduleSpec->isKind(ParseNodeKind::StringExpr));
+
+ const ParserAtom* module = moduleSpec->atom();
+ if (!maybeAppendRequestedModule(module, moduleSpec)) {
+ return false;
+ }
+
+ for (ParseNode* item : specList->contents()) {
+ BinaryNode* spec = &item->as<BinaryNode>();
+ MOZ_ASSERT(spec->isKind(ParseNodeKind::ImportSpec));
+
+ NameNode* importNameNode = &spec->left()->as<NameNode>();
+ NameNode* localNameNode = &spec->right()->as<NameNode>();
+
+ const ParserAtom* importName = importNameNode->atom();
+ const ParserAtom* localName = localNameNode->atom();
+
+ uint32_t line;
+ uint32_t column;
+ eitherParser_.computeLineAndColumn(importNameNode->pn_pos.begin, &line,
+ &column);
+
+ module->markUsedByStencil();
+ localName->markUsedByStencil();
+ importName->markUsedByStencil();
+ auto entry = frontend::StencilModuleEntry::importEntry(
+ module->toIndex(), localName->toIndex(), importName->toIndex(), line,
+ column);
+ if (!importEntries_.put(localName->toIndex(), entry)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool ModuleBuilder::processExport(frontend::ParseNode* exportNode) {
+ using namespace js::frontend;
+
+ MOZ_ASSERT(exportNode->isKind(ParseNodeKind::ExportStmt) ||
+ exportNode->isKind(ParseNodeKind::ExportDefaultStmt));
+
+ bool isDefault = exportNode->isKind(ParseNodeKind::ExportDefaultStmt);
+ ParseNode* kid = isDefault ? exportNode->as<BinaryNode>().left()
+ : exportNode->as<UnaryNode>().kid();
+
+ if (isDefault && exportNode->as<BinaryNode>().right()) {
+ // This is an export default containing an expression.
+ const ParserAtom* localName = cx_->parserNames().default_;
+ const ParserAtom* exportName = cx_->parserNames().default_;
+ return appendExportEntry(exportName, localName);
+ }
+
+ switch (kid->getKind()) {
+ case ParseNodeKind::ExportSpecList: {
+ MOZ_ASSERT(!isDefault);
+ for (ParseNode* item : kid->as<ListNode>().contents()) {
+ BinaryNode* spec = &item->as<BinaryNode>();
+ MOZ_ASSERT(spec->isKind(ParseNodeKind::ExportSpec));
+
+ NameNode* localNameNode = &spec->left()->as<NameNode>();
+ NameNode* exportNameNode = &spec->right()->as<NameNode>();
+
+ const ParserAtom* localName = localNameNode->atom();
+ const ParserAtom* exportName = exportNameNode->atom();
+
+ if (!appendExportEntry(exportName, localName, spec)) {
+ return false;
+ }
+ }
+ break;
+ }
+
+ case ParseNodeKind::ClassDecl: {
+ const ClassNode& cls = kid->as<ClassNode>();
+ MOZ_ASSERT(cls.names());
+ const frontend::ParserAtom* localName =
+ cls.names()->innerBinding()->atom();
+ const frontend::ParserAtom* exportName =
+ isDefault ? cx_->parserNames().default_ : localName;
+ if (!appendExportEntry(exportName, localName)) {
+ return false;
+ }
+ break;
+ }
+
+ case ParseNodeKind::VarStmt:
+ case ParseNodeKind::ConstDecl:
+ case ParseNodeKind::LetDecl: {
+ for (ParseNode* binding : kid->as<ListNode>().contents()) {
+ if (binding->isKind(ParseNodeKind::AssignExpr)) {
+ binding = binding->as<AssignmentNode>().left();
+ } else {
+ MOZ_ASSERT(binding->isKind(ParseNodeKind::Name));
+ }
+
+ if (binding->isKind(ParseNodeKind::Name)) {
+ const frontend::ParserAtom* localName =
+ binding->as<NameNode>().atom();
+ const frontend::ParserAtom* exportName =
+ isDefault ? cx_->parserNames().default_ : localName;
+ if (!appendExportEntry(exportName, localName)) {
+ return false;
+ }
+ } else if (binding->isKind(ParseNodeKind::ArrayExpr)) {
+ if (!processExportArrayBinding(&binding->as<ListNode>())) {
+ return false;
+ }
+ } else {
+ MOZ_ASSERT(binding->isKind(ParseNodeKind::ObjectExpr));
+ if (!processExportObjectBinding(&binding->as<ListNode>())) {
+ return false;
+ }
+ }
+ }
+ break;
+ }
+
+ case ParseNodeKind::Function: {
+ FunctionBox* box = kid->as<FunctionNode>().funbox();
+ MOZ_ASSERT(!box->isArrow());
+ const frontend::ParserAtom* localName = box->explicitName();
+ const frontend::ParserAtom* exportName =
+ isDefault ? cx_->parserNames().default_ : localName;
+ if (!appendExportEntry(exportName, localName)) {
+ return false;
+ }
+ break;
+ }
+
+ default:
+ MOZ_CRASH("Unexpected parse node");
+ }
+
+ return true;
+}
+
+bool ModuleBuilder::processExportBinding(frontend::ParseNode* binding) {
+ using namespace js::frontend;
+
+ if (binding->isKind(ParseNodeKind::Name)) {
+ const frontend::ParserAtom* name = binding->as<NameNode>().atom();
+ return appendExportEntry(name, name);
+ }
+
+ if (binding->isKind(ParseNodeKind::ArrayExpr)) {
+ return processExportArrayBinding(&binding->as<ListNode>());
+ }
+
+ MOZ_ASSERT(binding->isKind(ParseNodeKind::ObjectExpr));
+ return processExportObjectBinding(&binding->as<ListNode>());
+}
+
+bool ModuleBuilder::processExportArrayBinding(frontend::ListNode* array) {
+ using namespace js::frontend;
+
+ MOZ_ASSERT(array->isKind(ParseNodeKind::ArrayExpr));
+
+ for (ParseNode* node : array->contents()) {
+ if (node->isKind(ParseNodeKind::Elision)) {
+ continue;
+ }
+
+ if (node->isKind(ParseNodeKind::Spread)) {
+ node = node->as<UnaryNode>().kid();
+ } else if (node->isKind(ParseNodeKind::AssignExpr)) {
+ node = node->as<AssignmentNode>().left();
+ }
+
+ if (!processExportBinding(node)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool ModuleBuilder::processExportObjectBinding(frontend::ListNode* obj) {
+ using namespace js::frontend;
+
+ MOZ_ASSERT(obj->isKind(ParseNodeKind::ObjectExpr));
+
+ for (ParseNode* node : obj->contents()) {
+ MOZ_ASSERT(node->isKind(ParseNodeKind::MutateProto) ||
+ node->isKind(ParseNodeKind::PropertyDefinition) ||
+ node->isKind(ParseNodeKind::Shorthand) ||
+ node->isKind(ParseNodeKind::Spread));
+
+ ParseNode* target;
+ if (node->isKind(ParseNodeKind::Spread)) {
+ target = node->as<UnaryNode>().kid();
+ } else {
+ if (node->isKind(ParseNodeKind::MutateProto)) {
+ target = node->as<UnaryNode>().kid();
+ } else {
+ target = node->as<BinaryNode>().right();
+ }
+
+ if (target->isKind(ParseNodeKind::AssignExpr)) {
+ target = target->as<AssignmentNode>().left();
+ }
+ }
+
+ if (!processExportBinding(target)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool ModuleBuilder::processExportFrom(frontend::BinaryNode* exportNode) {
+ using namespace js::frontend;
+
+ MOZ_ASSERT(exportNode->isKind(ParseNodeKind::ExportFromStmt));
+
+ ListNode* specList = &exportNode->left()->as<ListNode>();
+ MOZ_ASSERT(specList->isKind(ParseNodeKind::ExportSpecList));
+
+ NameNode* moduleSpec = &exportNode->right()->as<NameNode>();
+ MOZ_ASSERT(moduleSpec->isKind(ParseNodeKind::StringExpr));
+
+ const frontend::ParserAtom* module = moduleSpec->atom();
+
+ if (!maybeAppendRequestedModule(module, moduleSpec)) {
+ return false;
+ }
+
+ for (ParseNode* spec : specList->contents()) {
+ if (spec->isKind(ParseNodeKind::ExportSpec)) {
+ NameNode* localNameNode = &spec->as<BinaryNode>().left()->as<NameNode>();
+ NameNode* exportNameNode =
+ &spec->as<BinaryNode>().right()->as<NameNode>();
+
+ const frontend::ParserAtom* bindingName = localNameNode->atom();
+ const frontend::ParserAtom* exportName = exportNameNode->atom();
+
+ if (!appendExportFromEntry(exportName, module, bindingName,
+ localNameNode)) {
+ return false;
+ }
+ } else {
+ MOZ_ASSERT(spec->isKind(ParseNodeKind::ExportBatchSpecStmt));
+ const frontend::ParserAtom* exportName = cx_->parserNames().star;
+ if (!appendExportFromEntry(nullptr, module, exportName, spec)) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+frontend::StencilModuleEntry* ModuleBuilder::importEntryFor(
+ frontend::TaggedParserAtomIndex localName) const {
+ MOZ_ASSERT(localName);
+ auto ptr = importEntries_.lookup(localName);
+ if (!ptr) {
+ return nullptr;
+ }
+
+ return &ptr->value();
+}
+
+bool ModuleBuilder::hasExportedName(const frontend::ParserAtom* name) const {
+ MOZ_ASSERT(name);
+ return exportNames_.has(name);
+}
+
+bool ModuleBuilder::appendExportEntry(const frontend::ParserAtom* exportName,
+ const frontend::ParserAtom* localName,
+ frontend::ParseNode* node) {
+ uint32_t line = 0;
+ uint32_t column = 0;
+ if (node) {
+ eitherParser_.computeLineAndColumn(node->pn_pos.begin, &line, &column);
+ }
+
+ localName->markUsedByStencil();
+ exportName->markUsedByStencil();
+ auto entry = frontend::StencilModuleEntry::exportAsEntry(
+ localName->toIndex(), exportName->toIndex(), line, column);
+ if (!exportEntries_.append(entry)) {
+ return false;
+ }
+
+ if (exportName) {
+ if (!exportNames_.put(exportName)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool ModuleBuilder::appendExportFromEntry(
+ const frontend::ParserAtom* exportName,
+ const frontend::ParserAtom* moduleRequest,
+ const frontend::ParserAtom* importName, frontend::ParseNode* node) {
+ uint32_t line;
+ uint32_t column;
+ eitherParser_.computeLineAndColumn(node->pn_pos.begin, &line, &column);
+
+ moduleRequest->markUsedByStencil();
+ importName->markUsedByStencil();
+ if (exportName) {
+ exportName->markUsedByStencil();
+ }
+ auto entry = frontend::StencilModuleEntry::exportFromEntry(
+ moduleRequest->toIndex(), importName->toIndex(),
+ exportName ? exportName->toIndex()
+ : frontend::TaggedParserAtomIndex::null(),
+ line, column);
+ if (!exportEntries_.append(entry)) {
+ return false;
+ }
+
+ return !exportName || exportNames_.put(exportName);
+}
+
+bool ModuleBuilder::maybeAppendRequestedModule(
+ const frontend::ParserAtom* specifier, frontend::ParseNode* node) {
+ if (requestedModuleSpecifiers_.has(specifier)) {
+ return true;
+ }
+
+ uint32_t line;
+ uint32_t column;
+ eitherParser_.computeLineAndColumn(node->pn_pos.begin, &line, &column);
+
+ specifier->markUsedByStencil();
+ auto entry = frontend::StencilModuleEntry::moduleRequest(specifier->toIndex(),
+ line, column);
+ if (!requestedModules_.append(entry)) {
+ js::ReportOutOfMemory(cx_);
+ return false;
+ }
+
+ return requestedModuleSpecifiers_.put(specifier);
+}
+
+template <typename T>
+ArrayObject* js::CreateArray(JSContext* cx,
+ const JS::Rooted<GCVector<T>>& vector) {
+ uint32_t length = vector.length();
+ RootedArrayObject array(cx, NewDenseFullyAllocatedArray(cx, length));
+ if (!array) {
+ return nullptr;
+ }
+
+ array->setDenseInitializedLength(length);
+ for (uint32_t i = 0; i < length; i++) {
+ array->initDenseElement(i, ObjectValue(*vector[i]));
+ }
+
+ return array;
+}
+
+JSObject* js::GetOrCreateModuleMetaObject(JSContext* cx,
+ HandleObject moduleArg) {
+ HandleModuleObject module = moduleArg.as<ModuleObject>();
+ if (JSObject* obj = module->metaObject()) {
+ return obj;
+ }
+
+ RootedObject metaObject(cx,
+ NewObjectWithGivenProto<PlainObject>(cx, nullptr));
+ if (!metaObject) {
+ return nullptr;
+ }
+
+ JS::ModuleMetadataHook func = cx->runtime()->moduleMetadataHook;
+ if (!func) {
+ JS_ReportErrorASCII(cx, "Module metadata hook not set");
+ return nullptr;
+ }
+
+ RootedValue modulePrivate(cx, JS::GetModulePrivate(module));
+ if (!func(cx, modulePrivate, metaObject)) {
+ return nullptr;
+ }
+
+ module->setMetaObject(metaObject);
+
+ return metaObject;
+}
+
+JSObject* js::CallModuleResolveHook(JSContext* cx,
+ HandleValue referencingPrivate,
+ HandleString specifier) {
+ JS::ModuleResolveHook moduleResolveHook = cx->runtime()->moduleResolveHook;
+ if (!moduleResolveHook) {
+ JS_ReportErrorASCII(cx, "Module resolve hook not set");
+ return nullptr;
+ }
+
+ RootedObject result(cx, moduleResolveHook(cx, referencingPrivate, specifier));
+ if (!result) {
+ return nullptr;
+ }
+
+ if (!result->is<ModuleObject>()) {
+ JS_ReportErrorASCII(cx, "Module resolve hook did not return Module object");
+ return nullptr;
+ }
+
+ return result;
+}
+
+// https://tc39.es/proposal-top-level-await/#sec-getasynccycleroot
+ModuleObject* js::GetAsyncCycleRoot(ModuleObject* module) {
+ // Step 1.
+ MOZ_ASSERT(module->status() == MODULE_STATUS_EVALUATED);
+
+ // Step 2.
+ if (module->asyncParentModules()->empty()) {
+ return module;
+ }
+
+ // Step 3.
+ ModuleObject* currentModule = module;
+ while (currentModule->dfsIndex() > currentModule->dfsAncestorIndex()) {
+ MOZ_ASSERT(!currentModule->asyncParentModules()->empty());
+ ModuleObject* nextCycleModule = &currentModule->asyncParentModules()
+ ->get(0)
+ .toObject()
+ .as<ModuleObject>();
+ MOZ_ASSERT(nextCycleModule->dfsAncestorIndex() <=
+ currentModule->dfsAncestorIndex());
+ currentModule = nextCycleModule;
+ }
+
+ // Step 4.
+ MOZ_ASSERT(currentModule->dfsIndex() == currentModule->dfsAncestorIndex());
+
+ // Step 5.
+ return currentModule;
+}
+
+bool js::AsyncModuleExecutionFulfilledHandler(JSContext* cx, unsigned argc,
+ Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ JSFunction& func = args.callee().as<JSFunction>();
+
+ Rooted<ModuleObject*> module(
+ cx, &func.getExtendedSlot(FunctionExtended::MODULE_SLOT)
+ .toObject()
+ .as<ModuleObject>());
+ AsyncModuleExecutionFulfilled(cx, module);
+ args.rval().setUndefined();
+ return true;
+}
+
+bool js::AsyncModuleExecutionRejectedHandler(JSContext* cx, unsigned argc,
+ Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ JSFunction& func = args.callee().as<JSFunction>();
+ Rooted<ModuleObject*> module(
+ cx, &func.getExtendedSlot(FunctionExtended::MODULE_SLOT)
+ .toObject()
+ .as<ModuleObject>());
+ AsyncModuleExecutionRejected(cx, module, args.get(0));
+ args.rval().setUndefined();
+ return true;
+}
+
+// Top Level Await
+// https://tc39.es/proposal-top-level-await/#sec-asyncmodulexecutionfulfilled
+void js::AsyncModuleExecutionFulfilled(JSContext* cx,
+ HandleModuleObject module) {
+ // Step 1.
+ MOZ_ASSERT(module->status() == MODULE_STATUS_EVALUATED);
+
+ // Step 2.
+ if (!module->isAsyncEvaluating()) {
+ MOZ_ASSERT(module->hadEvaluationError());
+ return;
+ }
+
+ // Step 3.
+ MOZ_ASSERT(!module->hadEvaluationError());
+
+ // Step 4.
+ module->setAsyncEvaluating(false);
+
+ // Step 5.
+ uint32_t length = module->asyncParentModules()->length();
+ Rooted<ModuleObject*> m(cx);
+ Rooted<ModuleObject*> cycleRoot(cx);
+ RootedValue result(cx);
+ for (uint32_t i = 0; i < length; i++) {
+ m = &module->asyncParentModules()->get(i).toObject().as<ModuleObject>();
+
+ if (module->dfsIndex() != module->dfsAncestorIndex()) {
+ MOZ_ASSERT(m->dfsAncestorIndex() <= module->dfsAncestorIndex());
+ }
+
+ m->setPendingAsyncDependencies(m->pendingAsyncDependencies() - 1);
+
+ if (m->pendingAsyncDependencies() == 0 && !m->hadEvaluationError()) {
+ MOZ_ASSERT(m->isAsyncEvaluating());
+
+ cycleRoot = GetAsyncCycleRoot(m);
+
+ if (cycleRoot->hadEvaluationError()) {
+ return;
+ }
+
+ if (m->isAsync()) {
+ // Steps for ExecuteAsyncModule
+ MOZ_ASSERT(m->status() == MODULE_STATUS_EVALUATING ||
+ m->status() == MODULE_STATUS_EVALUATED);
+ MOZ_ASSERT(m->isAsync());
+ MOZ_ASSERT(m->isAsyncEvaluating());
+ ModuleObject::execute(cx, m, &result);
+ } else {
+ if (ModuleObject::execute(cx, m, &result)) {
+ AsyncModuleExecutionFulfilled(cx, m);
+ } else {
+ AsyncModuleExecutionRejected(cx, m, result);
+ }
+ }
+ }
+ }
+
+ // Step 6.
+ if (module->hasTopLevelCapability()) {
+ MOZ_ASSERT(module->dfsIndex() == module->dfsAncestorIndex());
+ ModuleObject::topLevelCapabilityResolve(cx, module);
+ }
+
+ // Return undefined.
+}
+
+// https://tc39.es/proposal-top-level-await/#sec-asyncmodulexecutionrejected
+void js::AsyncModuleExecutionRejected(JSContext* cx, HandleModuleObject module,
+ HandleValue error) {
+ // Step 1.
+ MOZ_ASSERT(module->status() == MODULE_STATUS_EVALUATED);
+
+ // Step 2.
+ if (!module->isAsyncEvaluating()) {
+ MOZ_ASSERT(module->hadEvaluationError());
+ return;
+ }
+
+ // Step 3.
+ MOZ_ASSERT(!module->hadEvaluationError());
+
+ // Step 4.
+ module->setEvaluationError(error);
+
+ // Step 5.
+ module->setAsyncEvaluating(false);
+
+ // Step 6.
+ uint32_t length = module->asyncParentModules()->length();
+ Rooted<ModuleObject*> parent(cx);
+ for (uint32_t i = 0; i < length; i++) {
+ parent =
+ &module->asyncParentModules()->get(i).toObject().as<ModuleObject>();
+ if (module->dfsIndex() != module->dfsAncestorIndex()) {
+ MOZ_ASSERT(parent->dfsAncestorIndex() == module->dfsAncestorIndex());
+ }
+ AsyncModuleExecutionRejected(cx, parent, error);
+ }
+
+ // Step 7.
+ if (module->hasTopLevelCapability()) {
+ MOZ_ASSERT(module->dfsIndex() == module->dfsAncestorIndex());
+ ModuleObject::topLevelCapabilityReject(cx, module, error);
+ }
+
+ // Return undefined.
+}
+
+bool ModuleObject::topLevelCapabilityResolve(JSContext* cx,
+ HandleModuleObject module) {
+ RootedValue rval(cx);
+ Rooted<PromiseObject*> promise(
+ cx, &module->topLevelCapability()->as<PromiseObject>());
+ return AsyncFunctionReturned(cx, promise, rval);
+}
+
+bool ModuleObject::topLevelCapabilityReject(JSContext* cx,
+ HandleModuleObject module,
+ HandleValue error) {
+ Rooted<PromiseObject*> promise(
+ cx, &module->topLevelCapability()->as<PromiseObject>());
+ return AsyncFunctionThrown(cx, promise, error);
+}
+
+JSObject* js::StartDynamicModuleImport(JSContext* cx, HandleScript script,
+ HandleValue specifierArg) {
+ RootedObject promiseConstructor(cx, JS::GetPromiseConstructor(cx));
+ if (!promiseConstructor) {
+ return nullptr;
+ }
+
+ RootedObject promiseObject(cx, JS::NewPromiseObject(cx, nullptr));
+ if (!promiseObject) {
+ return nullptr;
+ }
+
+ Handle<PromiseObject*> promise = promiseObject.as<PromiseObject>();
+
+ JS::ModuleDynamicImportHook importHook =
+ cx->runtime()->moduleDynamicImportHook;
+
+ if (!importHook) {
+ // Dynamic import can be disabled by a pref and is not supported in all
+ // contexts (e.g. web workers).
+ JS_ReportErrorASCII(
+ cx,
+ "Dynamic module import is disabled or not supported in this context");
+ if (!RejectPromiseWithPendingError(cx, promise)) {
+ return nullptr;
+ }
+ return promise;
+ }
+
+ RootedString specifier(cx, ToString(cx, specifierArg));
+ if (!specifier) {
+ if (!RejectPromiseWithPendingError(cx, promise)) {
+ return nullptr;
+ }
+ return promise;
+ }
+
+ RootedValue referencingPrivate(cx,
+ script->sourceObject()->canonicalPrivate());
+ cx->runtime()->addRefScriptPrivate(referencingPrivate);
+
+ if (!importHook(cx, referencingPrivate, specifier, promise)) {
+ cx->runtime()->releaseScriptPrivate(referencingPrivate);
+
+ // If there's no exception pending then the script is terminating
+ // anyway, so just return nullptr.
+ if (!cx->isExceptionPending() ||
+ !RejectPromiseWithPendingError(cx, promise)) {
+ return nullptr;
+ }
+ return promise;
+ }
+
+ return promise;
+}
+
+static bool OnRootModuleRejected(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ HandleValue error = args.get(0);
+
+ js::ReportExceptionClosure reportExn(error);
+ PrepareScriptEnvironmentAndInvoke(cx, cx->global(), reportExn);
+
+ args.rval().setUndefined();
+ return true;
+};
+
+bool js::OnModuleEvaluationFailure(JSContext* cx,
+ HandleObject evaluationPromise) {
+ if (evaluationPromise == nullptr) {
+ return false;
+ }
+
+ RootedFunction onRejected(
+ cx, NewHandler(cx, OnRootModuleRejected, evaluationPromise));
+ if (!onRejected) {
+ return false;
+ }
+
+ return JS::AddPromiseReactions(cx, evaluationPromise, nullptr, onRejected);
+}
+
+// Adjustment for Top-level await;
+// See: https://github.com/tc39/proposal-dynamic-import/pull/71/files
+static bool OnResolvedDynamicModule(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ MOZ_ASSERT(args.get(0).isUndefined());
+
+ // This is a hack to allow us to have the 2 extra variables needed
+ // for FinishDynamicModuleImport in the resolve callback.
+ Rooted<ListObject*> resolvedModuleParams(cx,
+ ExtraFromHandler<ListObject>(args));
+ MOZ_ASSERT(resolvedModuleParams->length() == 2);
+ RootedValue referencingPrivate(cx, resolvedModuleParams->get(0));
+ RootedString specifier(cx, resolvedModuleParams->get(1).toString());
+
+ Rooted<PromiseObject*> promise(cx, TargetFromHandler<PromiseObject>(args));
+
+ auto releasePrivate = mozilla::MakeScopeExit(
+ [&] { cx->runtime()->releaseScriptPrivate(referencingPrivate); });
+
+ RootedObject result(cx,
+ CallModuleResolveHook(cx, referencingPrivate, specifier));
+
+ if (!result) {
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ RootedModuleObject module(cx, &result->as<ModuleObject>());
+ if (module->status() != MODULE_STATUS_EVALUATED) {
+ JS_ReportErrorASCII(
+ cx, "Unevaluated or errored module returned by module resolve hook");
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ MOZ_ASSERT(module->topLevelCapability()->as<PromiseObject>().state() ==
+ JS::PromiseState::Fulfilled);
+
+ RootedObject ns(cx, ModuleObject::GetOrCreateModuleNamespace(cx, module));
+ if (!ns) {
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ args.rval().setUndefined();
+ RootedValue value(cx, ObjectValue(*ns));
+ return PromiseObject::resolve(cx, promise, value);
+};
+
+static bool OnRejectedDynamicModule(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ HandleValue error = args.get(0);
+
+ RootedValue referencingPrivate(cx, ExtraValueFromHandler(args));
+ Rooted<PromiseObject*> promise(cx, TargetFromHandler<PromiseObject>(args));
+
+ auto releasePrivate = mozilla::MakeScopeExit(
+ [&] { cx->runtime()->releaseScriptPrivate(referencingPrivate); });
+
+ args.rval().setUndefined();
+ return PromiseObject::reject(cx, promise, error);
+};
+
+bool FinishDynamicModuleImport_impl(JSContext* cx,
+ HandleObject evaluationPromise,
+ HandleValue referencingPrivate,
+ HandleString specifier,
+ HandleObject promiseArg) {
+ Rooted<ListObject*> resolutionArgs(cx, ListObject::create(cx));
+ if (!resolutionArgs->append(cx, referencingPrivate)) {
+ return false;
+ }
+ Rooted<Value> stringValue(cx, StringValue(specifier));
+ if (!resolutionArgs->append(cx, stringValue)) {
+ return false;
+ }
+
+ Rooted<Value> resolutionArgsValue(cx, ObjectValue(*resolutionArgs));
+
+ RootedFunction onResolved(
+ cx, NewHandlerWithExtraValue(cx, OnResolvedDynamicModule, promiseArg,
+ resolutionArgsValue));
+ if (!onResolved) {
+ return false;
+ }
+
+ RootedFunction onRejected(
+ cx, NewHandlerWithExtraValue(cx, OnRejectedDynamicModule, promiseArg,
+ referencingPrivate));
+ if (!onRejected) {
+ return false;
+ }
+
+ return JS::AddPromiseReactionsIgnoringUnhandledRejection(
+ cx, evaluationPromise, onResolved, onRejected);
+}
+
+bool js::FinishDynamicModuleImport(JSContext* cx,
+ HandleObject evaluationPromise,
+ HandleValue referencingPrivate,
+ HandleString specifier,
+ HandleObject promiseArg) {
+ // If we do not have an evaluation promise for the module, we can assume that
+ // evaluation has failed or been interrupted -- we can reject the dynamic
+ // module.
+ auto releasePrivate = mozilla::MakeScopeExit(
+ [&] { cx->runtime()->releaseScriptPrivate(referencingPrivate); });
+
+ if (!evaluationPromise) {
+ Handle<PromiseObject*> promise = promiseArg.as<PromiseObject>();
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ if (!FinishDynamicModuleImport_impl(cx, evaluationPromise, referencingPrivate,
+ specifier, promiseArg)) {
+ return false;
+ }
+
+ releasePrivate.release();
+ return true;
+}
+
+bool js::FinishDynamicModuleImport_NoTLA(JSContext* cx,
+ JS::DynamicImportStatus status,
+ HandleValue referencingPrivate,
+ HandleString specifier,
+ HandleObject promiseArg) {
+ MOZ_ASSERT_IF(cx->isExceptionPending(),
+ status == JS::DynamicImportStatus::Failed);
+
+ Handle<PromiseObject*> promise = promiseArg.as<PromiseObject>();
+
+ auto releasePrivate = mozilla::MakeScopeExit(
+ [&] { cx->runtime()->releaseScriptPrivate(referencingPrivate); });
+
+ if (status == JS::DynamicImportStatus::Failed) {
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ RootedObject result(cx,
+ CallModuleResolveHook(cx, referencingPrivate, specifier));
+ if (!result) {
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ RootedModuleObject module(cx, &result->as<ModuleObject>());
+ if (module->status() != MODULE_STATUS_EVALUATED) {
+ JS_ReportErrorASCII(
+ cx, "Unevaluated or errored module returned by module resolve hook");
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ RootedObject ns(cx, ModuleObject::GetOrCreateModuleNamespace(cx, module));
+ if (!ns) {
+ return RejectPromiseWithPendingError(cx, promise);
+ }
+
+ RootedValue value(cx, ObjectValue(*ns));
+ return PromiseObject::resolve(cx, promise, value);
+}
+
+template <XDRMode mode>
+XDRResult js::XDRExportEntries(XDRState<mode>* xdr,
+ MutableHandleArrayObject vec) {
+ JSContext* cx = xdr->cx();
+ Rooted<GCVector<ExportEntryObject*>> expVec(cx);
+ RootedExportEntryObject expObj(cx);
+ RootedAtom exportName(cx);
+ RootedAtom moduleRequest(cx);
+ RootedAtom importName(cx);
+ RootedAtom localName(cx);
+
+ uint32_t length = 0;
+ uint32_t lineNumber = 0;
+ uint32_t columnNumber = 0;
+
+ if (mode == XDR_ENCODE) {
+ length = vec->length();
+ }
+ MOZ_TRY(xdr->codeUint32(&length));
+ for (uint32_t i = 0; i < length; i++) {
+ if (mode == XDR_ENCODE) {
+ expObj = &vec->getDenseElement(i).toObject().as<ExportEntryObject>();
+
+ exportName = expObj->exportName();
+ moduleRequest = expObj->moduleRequest();
+ importName = expObj->importName();
+ localName = expObj->localName();
+ lineNumber = expObj->lineNumber();
+ columnNumber = expObj->columnNumber();
+ }
+
+ MOZ_TRY(XDRAtomOrNull(xdr, &exportName));
+ MOZ_TRY(XDRAtomOrNull(xdr, &moduleRequest));
+ MOZ_TRY(XDRAtomOrNull(xdr, &importName));
+ MOZ_TRY(XDRAtomOrNull(xdr, &localName));
+
+ MOZ_TRY(xdr->codeUint32(&lineNumber));
+ MOZ_TRY(xdr->codeUint32(&columnNumber));
+
+ if (mode == XDR_DECODE) {
+ expObj.set(ExportEntryObject::create(cx, exportName, moduleRequest,
+ importName, localName, lineNumber,
+ columnNumber));
+ if (!expObj) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ if (!expVec.append(expObj)) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+ }
+
+ if (mode == XDR_DECODE) {
+ RootedArrayObject expArr(cx, js::CreateArray(cx, expVec));
+ if (!expArr) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ vec.set(expArr);
+ }
+
+ return Ok();
+}
+
+template <XDRMode mode>
+XDRResult js::XDRRequestedModuleObject(
+ XDRState<mode>* xdr, MutableHandleRequestedModuleObject reqObj) {
+ JSContext* cx = xdr->cx();
+ RootedAtom moduleSpecifier(cx);
+ uint32_t lineNumber = 0;
+ uint32_t columnNumber = 0;
+ if (mode == XDR_ENCODE) {
+ moduleSpecifier = reqObj->moduleSpecifier();
+ lineNumber = reqObj->lineNumber();
+ columnNumber = reqObj->columnNumber();
+ }
+
+ MOZ_TRY(XDRAtom(xdr, &moduleSpecifier));
+ MOZ_TRY(xdr->codeUint32(&lineNumber));
+ MOZ_TRY(xdr->codeUint32(&columnNumber));
+
+ if (mode == XDR_DECODE) {
+ reqObj.set(RequestedModuleObject::create(cx, moduleSpecifier, lineNumber,
+ columnNumber));
+ if (!reqObj) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+
+ return Ok();
+}
+
+template <XDRMode mode>
+XDRResult js::XDRImportEntryObject(XDRState<mode>* xdr,
+ MutableHandleImportEntryObject impObj) {
+ JSContext* cx = xdr->cx();
+ RootedAtom moduleRequest(cx);
+ RootedAtom importName(cx);
+ RootedAtom localName(cx);
+ uint32_t lineNumber = 0;
+ uint32_t columnNumber = 0;
+ if (mode == XDR_ENCODE) {
+ moduleRequest = impObj->moduleRequest();
+ importName = impObj->importName();
+ localName = impObj->localName();
+ lineNumber = impObj->lineNumber();
+ columnNumber = impObj->columnNumber();
+ }
+
+ MOZ_TRY(XDRAtomOrNull(xdr, &moduleRequest));
+ MOZ_TRY(XDRAtomOrNull(xdr, &importName));
+ MOZ_TRY(XDRAtomOrNull(xdr, &localName));
+ MOZ_TRY(xdr->codeUint32(&lineNumber));
+ MOZ_TRY(xdr->codeUint32(&columnNumber));
+
+ if (mode == XDR_DECODE) {
+ impObj.set(ImportEntryObject::create(cx, moduleRequest, importName,
+ localName, lineNumber, columnNumber));
+ if (!impObj) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+
+ return Ok();
+}
+
+template <XDRMode mode>
+XDRResult js::XDRModuleObject(XDRState<mode>* xdr,
+ MutableHandleModuleObject modp) {
+ JSContext* cx = xdr->cx();
+ RootedModuleObject module(cx, modp);
+
+ RootedScope enclosingScope(cx);
+ RootedScript script(cx);
+
+ RootedArrayObject requestedModules(cx);
+ RootedArrayObject importEntries(cx);
+ RootedArrayObject localExportEntries(cx);
+ RootedArrayObject indirectExportEntries(cx);
+ RootedArrayObject starExportEntries(cx);
+ // funcDecls points to data traced by the ModuleObject,
+ // but is itself heap-allocated so we don't need to
+ // worry about rooting it again here.
+ frontend::FunctionDeclarationVector* funcDecls;
+
+ uint32_t requestedModulesLength = 0;
+ uint32_t importEntriesLength = 0;
+ uint32_t funcDeclLength = 0;
+
+ if (mode == XDR_ENCODE) {
+ module = modp.get();
+
+ script.set(module->script());
+ enclosingScope.set(module->enclosingScope());
+ MOZ_ASSERT(!enclosingScope->as<GlobalScope>().hasBindings());
+
+ requestedModules = &module->requestedModules();
+ importEntries = &module->importEntries();
+ localExportEntries = &module->localExportEntries();
+ indirectExportEntries = &module->indirectExportEntries();
+ starExportEntries = &module->starExportEntries();
+ funcDecls = GetFunctionDeclarations(module.get());
+
+ requestedModulesLength = requestedModules->length();
+ importEntriesLength = importEntries->length();
+ funcDeclLength = funcDecls->length();
+ }
+
+ /* ScriptSourceObject slot - ScriptSourceObject is created in XDRScript and is
+ * set when init is called. */
+ if (mode == XDR_DECODE) {
+ enclosingScope.set(&cx->global()->emptyGlobalScope());
+ module.set(ModuleObject::create(cx));
+ if (!module) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+
+ /* Script slot */
+ MOZ_TRY(XDRScript(xdr, enclosingScope, nullptr, module, &script));
+
+ if (mode == XDR_DECODE) {
+ module->initScriptSlots(script);
+ module->initStatusSlot();
+ }
+
+ /* Environment Slot */
+ if (mode == XDR_DECODE) {
+ if (!ModuleObject::createEnvironment(cx, module)) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+
+ /* Namespace Slot, Status Slot, EvaluationErrorSlot, MetaObject - Initialized
+ * at instantiation */
+
+ /* RequestedModules slot */
+ RootedRequestedModuleVector reqVec(cx, GCVector<RequestedModuleObject*>(cx));
+ RootedRequestedModuleObject reqObj(cx);
+ MOZ_TRY(xdr->codeUint32(&requestedModulesLength));
+ for (uint32_t i = 0; i < requestedModulesLength; i++) {
+ if (mode == XDR_ENCODE) {
+ reqObj = &module->requestedModules()
+ .getDenseElement(i)
+ .toObject()
+ .as<RequestedModuleObject>();
+ }
+ MOZ_TRY(XDRRequestedModuleObject(xdr, &reqObj));
+ if (mode == XDR_DECODE) {
+ if (!reqVec.append(reqObj)) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+ }
+ if (mode == XDR_DECODE) {
+ RootedArrayObject reqArr(cx, js::CreateArray(cx, reqVec));
+ if (!reqArr) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ requestedModules.set(reqArr);
+ }
+
+ /* ImportEntries slot */
+ RootedImportEntryVector impVec(cx, GCVector<ImportEntryObject*>(cx));
+ RootedImportEntryObject impObj(cx);
+ MOZ_TRY(xdr->codeUint32(&importEntriesLength));
+ for (uint32_t i = 0; i < importEntriesLength; i++) {
+ if (mode == XDR_ENCODE) {
+ impObj = &module->importEntries()
+ .getDenseElement(i)
+ .toObject()
+ .as<ImportEntryObject>();
+ }
+ MOZ_TRY(XDRImportEntryObject(xdr, &impObj));
+ if (mode == XDR_DECODE) {
+ if (!impVec.append(impObj)) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+ }
+
+ if (mode == XDR_DECODE) {
+ RootedArrayObject impArr(cx, js::CreateArray(cx, impVec));
+ if (!impArr) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ importEntries.set(impArr);
+ }
+
+ /* LocalExportEntries slot */
+ MOZ_TRY(XDRExportEntries(xdr, &localExportEntries));
+ /* IndirectExportEntries slot */
+ MOZ_TRY(XDRExportEntries(xdr, &indirectExportEntries));
+ /* StarExportEntries slot */
+ MOZ_TRY(XDRExportEntries(xdr, &starExportEntries));
+
+ /* FunctionDeclarations slot */
+ uint32_t funIndex = 0;
+ MOZ_TRY(xdr->codeUint32(&funcDeclLength));
+ for (uint32_t i = 0; i < funcDeclLength; i++) {
+ if (mode == XDR_ENCODE) {
+ funIndex = (*funcDecls)[i];
+ }
+
+ MOZ_TRY(xdr->codeUint32(&funIndex));
+
+ if (mode == XDR_DECODE) {
+ if (!GetFunctionDeclarations(module.get())->append(funIndex)) {
+ ReportOutOfMemory(cx);
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+ }
+ }
+
+ /* ImportBindings slot, DFSIndex slot, DFSAncestorIndex slot -
+ * Initialized at instantiation */
+ if (mode == XDR_DECODE) {
+ module->initImportExportData(requestedModules, importEntries,
+ localExportEntries, indirectExportEntries,
+ starExportEntries);
+ }
+
+ /* isAsync Slot */
+ uint8_t isAsyncModule = 0;
+ if (mode == XDR_ENCODE) {
+ isAsyncModule = module->isAsync() ? 1 : 0;
+ }
+
+ MOZ_TRY(xdr->codeUint8(&isAsyncModule));
+
+ if (mode == XDR_DECODE) {
+ Rooted<ListObject*> asyncParentModulesList(cx, ListObject::create(cx));
+ if (!asyncParentModulesList) {
+ return xdr->fail(JS::TranscodeResult_Throw);
+ }
+
+ module->initAsyncSlots(cx, isAsyncModule == 1, asyncParentModulesList);
+ }
+
+ modp.set(module);
+ return Ok();
+}
+
+template XDRResult js::XDRModuleObject(XDRState<XDR_ENCODE>* xdr,
+ MutableHandleModuleObject scriptp);
+
+template XDRResult js::XDRModuleObject(XDRState<XDR_DECODE>* xdr,
+ MutableHandleModuleObject scriptp);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 22:35:58 +0000