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+/* -*- 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 "vm/AsyncIteration.h"
+
+#include "builtin/Array.h"
+
+#include "builtin/Promise.h" // js::AsyncFromSyncIteratorMethod, js::AsyncGeneratorEnqueue
+#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
+#include "js/PropertySpec.h"
+#include "vm/FunctionFlags.h" // js::FunctionFlags
+#include "vm/GeneratorObject.h"
+#include "vm/GlobalObject.h"
+#include "vm/Interpreter.h"
+#include "vm/PlainObject.h" // js::PlainObject
+#include "vm/PromiseObject.h" // js::PromiseObject
+#include "vm/Realm.h"
+#include "vm/SelfHosting.h"
+
+#include "vm/JSContext-inl.h"
+#include "vm/JSObject-inl.h"
+#include "vm/List-inl.h"
+
+using namespace js;
+
+// ES2019 draft rev 49b781ec80117b60f73327ef3054703a3111e40c
+// 6.2.3.1.1 Await Fulfilled Functions
+MOZ_MUST_USE bool js::AsyncGeneratorAwaitedFulfilled(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ HandleValue value) {
+ return AsyncGeneratorResume(cx, asyncGenObj, CompletionKind::Normal, value);
+}
+
+// ES2019 draft rev 49b781ec80117b60f73327ef3054703a3111e40c
+// 6.2.3.1.2 Await Rejected Functions
+MOZ_MUST_USE bool js::AsyncGeneratorAwaitedRejected(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ HandleValue reason) {
+ return AsyncGeneratorResume(cx, asyncGenObj, CompletionKind::Throw, reason);
+}
+
+// ES2019 draft rev 49b781ec80117b60f73327ef3054703a3111e40c
+// 25.5.3.7 AsyncGeneratorYield, step 8.e.
+MOZ_MUST_USE bool js::AsyncGeneratorYieldReturnAwaitedFulfilled(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ HandleValue value) {
+ return AsyncGeneratorResume(cx, asyncGenObj, CompletionKind::Return, value);
+}
+
+// ES2019 draft rev 49b781ec80117b60f73327ef3054703a3111e40c
+// 25.5.3.7 AsyncGeneratorYield, step 8.c.
+MOZ_MUST_USE bool js::AsyncGeneratorYieldReturnAwaitedRejected(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ HandleValue reason) {
+ return AsyncGeneratorResume(cx, asyncGenObj, CompletionKind::Throw, reason);
+}
+
+const JSClass AsyncFromSyncIteratorObject::class_ = {
+ "AsyncFromSyncIteratorObject",
+ JSCLASS_HAS_RESERVED_SLOTS(AsyncFromSyncIteratorObject::Slots)};
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.1.4.1 CreateAsyncFromSyncIterator
+JSObject* js::CreateAsyncFromSyncIterator(JSContext* cx, HandleObject iter,
+ HandleValue nextMethod) {
+ // Steps 1-3.
+ return AsyncFromSyncIteratorObject::create(cx, iter, nextMethod);
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.1.4.1 CreateAsyncFromSyncIterator
+/* static */
+JSObject* AsyncFromSyncIteratorObject::create(JSContext* cx, HandleObject iter,
+ HandleValue nextMethod) {
+ // Step 1.
+ RootedObject proto(cx,
+ GlobalObject::getOrCreateAsyncFromSyncIteratorPrototype(
+ cx, cx->global()));
+ if (!proto) {
+ return nullptr;
+ }
+
+ AsyncFromSyncIteratorObject* asyncIter =
+ NewObjectWithGivenProto<AsyncFromSyncIteratorObject>(cx, proto);
+ if (!asyncIter) {
+ return nullptr;
+ }
+
+ // Step 2.
+ asyncIter->init(iter, nextMethod);
+
+ // Step 3 (Call to 7.4.1 GetIterator).
+ // 7.4.1 GetIterator, steps 1-5 are a no-op (*).
+ // 7.4.1 GetIterator, steps 6-8 are implemented in bytecode.
+ //
+ // (*) With <https://github.com/tc39/ecma262/issues/1172> fixed.
+ return asyncIter;
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.1.4.2.1 %AsyncFromSyncIteratorPrototype%.next
+static bool AsyncFromSyncIteratorNext(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return AsyncFromSyncIteratorMethod(cx, args, CompletionKind::Normal);
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.1.4.2.2 %AsyncFromSyncIteratorPrototype%.return
+static bool AsyncFromSyncIteratorReturn(JSContext* cx, unsigned argc,
+ Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return AsyncFromSyncIteratorMethod(cx, args, CompletionKind::Return);
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.1.4.2.3 %AsyncFromSyncIteratorPrototype%.throw
+static bool AsyncFromSyncIteratorThrow(JSContext* cx, unsigned argc,
+ Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return AsyncFromSyncIteratorMethod(cx, args, CompletionKind::Throw);
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.5.1.2 AsyncGenerator.prototype.next
+bool js::AsyncGeneratorNext(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ // Steps 1-3.
+ return AsyncGeneratorEnqueue(cx, args.thisv(), CompletionKind::Normal,
+ args.get(0), args.rval());
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.5.1.3 AsyncGenerator.prototype.return
+bool js::AsyncGeneratorReturn(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ // Steps 1-3.
+ return AsyncGeneratorEnqueue(cx, args.thisv(), CompletionKind::Return,
+ args.get(0), args.rval());
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.5.1.4 AsyncGenerator.prototype.throw
+bool js::AsyncGeneratorThrow(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ // Steps 1-3.
+ return AsyncGeneratorEnqueue(cx, args.thisv(), CompletionKind::Throw,
+ args.get(0), args.rval());
+}
+
+const JSClass AsyncGeneratorObject::class_ = {
+ "AsyncGenerator",
+ JSCLASS_HAS_RESERVED_SLOTS(AsyncGeneratorObject::Slots),
+ &classOps_,
+};
+
+const JSClassOps AsyncGeneratorObject::classOps_ = {
+ nullptr, // addProperty
+ nullptr, // delProperty
+ nullptr, // enumerate
+ nullptr, // newEnumerate
+ nullptr, // resolve
+ nullptr, // mayResolve
+ nullptr, // finalize
+ nullptr, // call
+ nullptr, // hasInstance
+ nullptr, // construct
+ CallTraceMethod<AbstractGeneratorObject>, // trace
+};
+
+// ES 2017 draft 9.1.13.
+// OrdinaryCreateFromConstructor specialized for AsyncGeneratorObjects.
+static AsyncGeneratorObject* OrdinaryCreateFromConstructorAsynGen(
+ JSContext* cx, HandleFunction fun) {
+ // Step 1 (skipped).
+
+ // Step 2.
+ RootedValue protoVal(cx);
+ if (!GetProperty(cx, fun, fun, cx->names().prototype, &protoVal)) {
+ return nullptr;
+ }
+
+ RootedObject proto(cx, protoVal.isObject() ? &protoVal.toObject() : nullptr);
+ if (!proto) {
+ proto = GlobalObject::getOrCreateAsyncGeneratorPrototype(cx, cx->global());
+ if (!proto) {
+ return nullptr;
+ }
+ }
+
+ // Step 3.
+ return NewObjectWithGivenProto<AsyncGeneratorObject>(cx, proto);
+}
+
+/* static */
+AsyncGeneratorObject* AsyncGeneratorObject::create(JSContext* cx,
+ HandleFunction asyncGen) {
+ MOZ_ASSERT(asyncGen->isAsync() && asyncGen->isGenerator());
+
+ AsyncGeneratorObject* asyncGenObj =
+ OrdinaryCreateFromConstructorAsynGen(cx, asyncGen);
+ if (!asyncGenObj) {
+ return nullptr;
+ }
+
+ // ES2019 draft rev c2aad21fee7f5ddc89fdf7d3d305618ca3a13242
+ // 25.5.3.2 AsyncGeneratorStart.
+
+ // Step 7.
+ asyncGenObj->setSuspendedStart();
+
+ // Step 8.
+ asyncGenObj->clearSingleQueueRequest();
+
+ asyncGenObj->clearCachedRequest();
+
+ return asyncGenObj;
+}
+
+/* static */
+AsyncGeneratorRequest* AsyncGeneratorObject::createRequest(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ CompletionKind completionKind, HandleValue completionValue,
+ Handle<PromiseObject*> promise) {
+ if (!asyncGenObj->hasCachedRequest()) {
+ return AsyncGeneratorRequest::create(cx, completionKind, completionValue,
+ promise);
+ }
+
+ AsyncGeneratorRequest* request = asyncGenObj->takeCachedRequest();
+ request->init(completionKind, completionValue, promise);
+ return request;
+}
+
+/* static */ MOZ_MUST_USE bool AsyncGeneratorObject::enqueueRequest(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ Handle<AsyncGeneratorRequest*> request) {
+ if (asyncGenObj->isSingleQueue()) {
+ if (asyncGenObj->isSingleQueueEmpty()) {
+ asyncGenObj->setSingleQueueRequest(request);
+ return true;
+ }
+
+ Rooted<ListObject*> queue(cx, ListObject::create(cx));
+ if (!queue) {
+ return false;
+ }
+
+ RootedValue requestVal(cx, ObjectValue(*asyncGenObj->singleQueueRequest()));
+ if (!queue->append(cx, requestVal)) {
+ return false;
+ }
+ requestVal = ObjectValue(*request);
+ if (!queue->append(cx, requestVal)) {
+ return false;
+ }
+
+ asyncGenObj->setQueue(queue);
+ return true;
+ }
+
+ Rooted<ListObject*> queue(cx, asyncGenObj->queue());
+ RootedValue requestVal(cx, ObjectValue(*request));
+ return queue->append(cx, requestVal);
+}
+
+/* static */
+AsyncGeneratorRequest* AsyncGeneratorObject::dequeueRequest(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj) {
+ if (asyncGenObj->isSingleQueue()) {
+ AsyncGeneratorRequest* request = asyncGenObj->singleQueueRequest();
+ asyncGenObj->clearSingleQueueRequest();
+ return request;
+ }
+
+ Rooted<ListObject*> queue(cx, asyncGenObj->queue());
+ return &queue->popFirstAs<AsyncGeneratorRequest>(cx);
+}
+
+/* static */
+AsyncGeneratorRequest* AsyncGeneratorObject::peekRequest(
+ Handle<AsyncGeneratorObject*> asyncGenObj) {
+ if (asyncGenObj->isSingleQueue()) {
+ return asyncGenObj->singleQueueRequest();
+ }
+
+ return &asyncGenObj->queue()->getAs<AsyncGeneratorRequest>(0);
+}
+
+const JSClass AsyncGeneratorRequest::class_ = {
+ "AsyncGeneratorRequest",
+ JSCLASS_HAS_RESERVED_SLOTS(AsyncGeneratorRequest::Slots)};
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.5.3.1 AsyncGeneratorRequest Records
+/* static */
+AsyncGeneratorRequest* AsyncGeneratorRequest::create(
+ JSContext* cx, CompletionKind completionKind, HandleValue completionValue,
+ Handle<PromiseObject*> promise) {
+ AsyncGeneratorRequest* request =
+ NewObjectWithGivenProto<AsyncGeneratorRequest>(cx, nullptr);
+ if (!request) {
+ return nullptr;
+ }
+
+ request->init(completionKind, completionValue, promise);
+ return request;
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.5.3.2 AsyncGeneratorStart
+static MOZ_MUST_USE bool AsyncGeneratorReturned(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ HandleValue value) {
+ // Step 5.d.
+ asyncGenObj->setCompleted();
+
+ // Step 5.e (done in bytecode).
+ // Step 5.f.i (implicit).
+
+ // Step 5.g.
+ return AsyncGeneratorResolve(cx, asyncGenObj, value, true);
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.5.3.2 AsyncGeneratorStart
+static MOZ_MUST_USE bool AsyncGeneratorThrown(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj) {
+ // Step 5.d.
+ asyncGenObj->setCompleted();
+
+ // Not much we can do about uncatchable exceptions, so just bail.
+ if (!cx->isExceptionPending()) {
+ return false;
+ }
+
+ // Step 5.f.i.
+ RootedValue value(cx);
+ if (!GetAndClearException(cx, &value)) {
+ return false;
+ }
+
+ // Step 5.f.ii.
+ return AsyncGeneratorReject(cx, asyncGenObj, value);
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 25.5.3.7 AsyncGeneratorYield (partially)
+// Most steps are done in generator.
+static MOZ_MUST_USE bool AsyncGeneratorYield(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ HandleValue value) {
+ // Step 5 is done in bytecode.
+
+ // Step 6.
+ asyncGenObj->setSuspendedYield();
+
+ // Step 9.
+ return AsyncGeneratorResolve(cx, asyncGenObj, value, false);
+}
+
+// ES2019 draft rev c012f9c70847559a1d9dc0d35d35b27fec42911e
+// 6.2.3.1 Await, steps 2-9.
+// 14.4.13 RS: Evaluation, yield*, steps 7.a.vi, 7.b.ii.7, 7.c.ix.
+// 25.5.3.2 AsyncGeneratorStart, steps 5.d-g.
+// 25.5.3.5 AsyncGeneratorResumeNext, steps 12-20.
+// 25.5.3.7 AsyncGeneratorYield, steps 5-6, 9.
+//
+// Note: Execution context switching is handled in generator.
+MOZ_MUST_USE bool js::AsyncGeneratorResume(
+ JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
+ CompletionKind completionKind, HandleValue argument) {
+ MOZ_ASSERT(!asyncGenObj->isClosed(),
+ "closed generator when resuming async generator");
+ MOZ_ASSERT(asyncGenObj->isSuspended(),
+ "non-suspended generator when resuming async generator");
+ MOZ_ASSERT(asyncGenObj->isExecuting(),
+ "async generator not set into 'executing' state");
+
+ // 25.5.3.5, steps 12-14, 16-20.
+ HandlePropertyName funName = completionKind == CompletionKind::Normal
+ ? cx->names().AsyncGeneratorNext
+ : completionKind == CompletionKind::Throw
+ ? cx->names().AsyncGeneratorThrow
+ : cx->names().AsyncGeneratorReturn;
+ FixedInvokeArgs<1> args(cx);
+ args[0].set(argument);
+ RootedValue thisOrRval(cx, ObjectValue(*asyncGenObj));
+ if (!CallSelfHostedFunction(cx, funName, thisOrRval, args, &thisOrRval)) {
+ // 25.5.3.2, steps 5.f, 5.g.
+ if (!asyncGenObj->isClosed()) {
+ asyncGenObj->setClosed();
+ }
+ return AsyncGeneratorThrown(cx, asyncGenObj);
+ }
+
+ // 6.2.3.1, steps 2-9.
+ if (asyncGenObj->isAfterAwait()) {
+ return AsyncGeneratorAwait(cx, asyncGenObj, thisOrRval);
+ }
+
+ // 25.5.3.7, steps 5-6, 9.
+ if (asyncGenObj->isAfterYield()) {
+ return AsyncGeneratorYield(cx, asyncGenObj, thisOrRval);
+ }
+
+ // 25.5.3.2, steps 5.d-g.
+ return AsyncGeneratorReturned(cx, asyncGenObj, thisOrRval);
+}
+
+static const JSFunctionSpec async_iterator_proto_methods[] = {
+ JS_SELF_HOSTED_SYM_FN(asyncIterator, "AsyncIteratorIdentity", 0, 0),
+ JS_FS_END};
+
+static const JSFunctionSpec async_iterator_proto_methods_with_helpers[] = {
+ JS_SELF_HOSTED_FN("map", "AsyncIteratorMap", 1, 0),
+ JS_SELF_HOSTED_FN("filter", "AsyncIteratorFilter", 1, 0),
+ JS_SELF_HOSTED_FN("take", "AsyncIteratorTake", 1, 0),
+ JS_SELF_HOSTED_FN("drop", "AsyncIteratorDrop", 1, 0),
+ JS_SELF_HOSTED_FN("asIndexedPairs", "AsyncIteratorAsIndexedPairs", 0, 0),
+ JS_SELF_HOSTED_FN("flatMap", "AsyncIteratorFlatMap", 1, 0),
+ JS_SELF_HOSTED_FN("reduce", "AsyncIteratorReduce", 1, 0),
+ JS_SELF_HOSTED_FN("toArray", "AsyncIteratorToArray", 0, 0),
+ JS_SELF_HOSTED_FN("forEach", "AsyncIteratorForEach", 1, 0),
+ JS_SELF_HOSTED_FN("some", "AsyncIteratorSome", 1, 0),
+ JS_SELF_HOSTED_FN("every", "AsyncIteratorEvery", 1, 0),
+ JS_SELF_HOSTED_FN("find", "AsyncIteratorFind", 1, 0),
+ JS_SELF_HOSTED_SYM_FN(asyncIterator, "AsyncIteratorIdentity", 0, 0),
+ JS_FS_END};
+
+static const JSFunctionSpec async_from_sync_iter_methods[] = {
+ JS_FN("next", AsyncFromSyncIteratorNext, 1, 0),
+ JS_FN("throw", AsyncFromSyncIteratorThrow, 1, 0),
+ JS_FN("return", AsyncFromSyncIteratorReturn, 1, 0), JS_FS_END};
+
+static const JSFunctionSpec async_generator_methods[] = {
+ JS_FN("next", js::AsyncGeneratorNext, 1, 0),
+ JS_FN("throw", js::AsyncGeneratorThrow, 1, 0),
+ JS_FN("return", js::AsyncGeneratorReturn, 1, 0), JS_FS_END};
+
+bool GlobalObject::initAsyncIteratorProto(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ if (global->getReservedSlot(ASYNC_ITERATOR_PROTO).isObject()) {
+ return true;
+ }
+
+ // 25.1.3 The %AsyncIteratorPrototype% Object
+ RootedObject asyncIterProto(
+ cx, GlobalObject::createBlankPrototype<PlainObject>(cx, global));
+ if (!asyncIterProto) {
+ return false;
+ }
+ if (!DefinePropertiesAndFunctions(cx, asyncIterProto, nullptr,
+ async_iterator_proto_methods)) {
+ return false;
+ }
+
+ global->setReservedSlot(ASYNC_ITERATOR_PROTO, ObjectValue(*asyncIterProto));
+ return true;
+}
+
+bool GlobalObject::initAsyncFromSyncIteratorProto(
+ JSContext* cx, Handle<GlobalObject*> global) {
+ if (global->getReservedSlot(ASYNC_FROM_SYNC_ITERATOR_PROTO).isObject()) {
+ return true;
+ }
+
+ RootedObject asyncIterProto(
+ cx, GlobalObject::getOrCreateAsyncIteratorPrototype(cx, global));
+ if (!asyncIterProto) {
+ return false;
+ }
+
+ // 25.1.4.2 The %AsyncFromSyncIteratorPrototype% Object
+ RootedObject asyncFromSyncIterProto(
+ cx, GlobalObject::createBlankPrototypeInheriting(cx, &PlainObject::class_,
+ asyncIterProto));
+ if (!asyncFromSyncIterProto) {
+ return false;
+ }
+ if (!DefinePropertiesAndFunctions(cx, asyncFromSyncIterProto, nullptr,
+ async_from_sync_iter_methods) ||
+ !DefineToStringTag(cx, asyncFromSyncIterProto,
+ cx->names().AsyncFromSyncIterator)) {
+ return false;
+ }
+
+ global->setReservedSlot(ASYNC_FROM_SYNC_ITERATOR_PROTO,
+ ObjectValue(*asyncFromSyncIterProto));
+ return true;
+}
+
+static JSObject* CreateAsyncGeneratorFunction(JSContext* cx, JSProtoKey key) {
+ RootedObject proto(
+ cx, GlobalObject::getOrCreateFunctionConstructor(cx, cx->global()));
+ if (!proto) {
+ return nullptr;
+ }
+ HandlePropertyName name = cx->names().AsyncGeneratorFunction;
+
+ // 25.3.1 The AsyncGeneratorFunction Constructor
+ return NewFunctionWithProto(cx, AsyncGeneratorConstructor, 1,
+ FunctionFlags::NATIVE_CTOR, nullptr, name, proto,
+ gc::AllocKind::FUNCTION, TenuredObject);
+}
+
+static JSObject* CreateAsyncGeneratorFunctionPrototype(JSContext* cx,
+ JSProtoKey key) {
+ return NewTenuredObjectWithFunctionPrototype(cx, cx->global());
+}
+
+static bool AsyncGeneratorFunctionClassFinish(JSContext* cx,
+ HandleObject asyncGenFunction,
+ HandleObject asyncGenerator) {
+ Handle<GlobalObject*> global = cx->global();
+
+ // Change the "constructor" property to non-writable before adding any other
+ // properties, so it's still the last property and can be modified without a
+ // dictionary-mode transition.
+ MOZ_ASSERT(StringEqualsAscii(
+ JSID_TO_LINEAR_STRING(
+ asyncGenerator->as<NativeObject>().lastProperty()->propid()),
+ "constructor"));
+ MOZ_ASSERT(!asyncGenerator->as<NativeObject>().inDictionaryMode());
+
+ RootedValue asyncGenFunctionVal(cx, ObjectValue(*asyncGenFunction));
+ if (!DefineDataProperty(cx, asyncGenerator, cx->names().constructor,
+ asyncGenFunctionVal, JSPROP_READONLY)) {
+ return false;
+ }
+ MOZ_ASSERT(!asyncGenerator->as<NativeObject>().inDictionaryMode());
+
+ RootedObject asyncIterProto(
+ cx, GlobalObject::getOrCreateAsyncIteratorPrototype(cx, global));
+ if (!asyncIterProto) {
+ return false;
+ }
+
+ // 25.5 AsyncGenerator Objects
+ RootedObject asyncGenProto(cx, GlobalObject::createBlankPrototypeInheriting(
+ cx, &PlainObject::class_, asyncIterProto));
+ if (!asyncGenProto) {
+ return false;
+ }
+ if (!DefinePropertiesAndFunctions(cx, asyncGenProto, nullptr,
+ async_generator_methods) ||
+ !DefineToStringTag(cx, asyncGenProto, cx->names().AsyncGenerator)) {
+ return false;
+ }
+
+ // 25.3.3 Properties of the AsyncGeneratorFunction Prototype Object
+ if (!LinkConstructorAndPrototype(cx, asyncGenerator, asyncGenProto,
+ JSPROP_READONLY, JSPROP_READONLY) ||
+ !DefineToStringTag(cx, asyncGenerator,
+ cx->names().AsyncGeneratorFunction)) {
+ return false;
+ }
+
+ global->setAsyncGeneratorPrototype(asyncGenProto);
+
+ return true;
+}
+
+static const ClassSpec AsyncGeneratorFunctionClassSpec = {
+ CreateAsyncGeneratorFunction,
+ CreateAsyncGeneratorFunctionPrototype,
+ nullptr,
+ nullptr,
+ nullptr,
+ nullptr,
+ AsyncGeneratorFunctionClassFinish,
+ ClassSpec::DontDefineConstructor};
+
+const JSClass js::AsyncGeneratorFunctionClass = {
+ "AsyncGeneratorFunction", 0, JS_NULL_CLASS_OPS,
+ &AsyncGeneratorFunctionClassSpec};
+
+// https://tc39.es/proposal-iterator-helpers/#sec-asynciterator as of revision
+// 8f10db5.
+static bool AsyncIteratorConstructor(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ // Step 1.
+ if (!ThrowIfNotConstructing(cx, args, js_AsyncIterator_str)) {
+ return false;
+ }
+ // Throw TypeError if NewTarget is the active function object, preventing the
+ // Iterator constructor from being used directly.
+ if (args.callee() == args.newTarget().toObject()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_BOGUS_CONSTRUCTOR, js_AsyncIterator_str);
+ return false;
+ }
+
+ // Step 2.
+ RootedObject proto(cx);
+ if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_AsyncIterator,
+ &proto)) {
+ return false;
+ }
+
+ JSObject* obj = NewObjectWithClassProto<AsyncIteratorObject>(cx, proto);
+ if (!obj) {
+ return false;
+ }
+
+ args.rval().setObject(*obj);
+ return true;
+}
+
+static const ClassSpec AsyncIteratorObjectClassSpec = {
+ GenericCreateConstructor<AsyncIteratorConstructor, 0,
+ gc::AllocKind::FUNCTION>,
+ GenericCreatePrototype<AsyncIteratorObject>,
+ nullptr,
+ nullptr,
+ async_iterator_proto_methods_with_helpers,
+ nullptr,
+ nullptr,
+};
+
+const JSClass AsyncIteratorObject::class_ = {
+ js_AsyncIterator_str,
+ JSCLASS_HAS_CACHED_PROTO(JSProto_AsyncIterator),
+ JS_NULL_CLASS_OPS,
+ &AsyncIteratorObjectClassSpec,
+};
+
+const JSClass AsyncIteratorObject::protoClass_ = {
+ "AsyncIterator.prototype",
+ JSCLASS_HAS_CACHED_PROTO(JSProto_AsyncIterator),
+ JS_NULL_CLASS_OPS,
+ &AsyncIteratorObjectClassSpec,
+};
+
+// Iterator Helper proposal
+static const JSFunctionSpec async_iterator_helper_methods[] = {
+ JS_SELF_HOSTED_FN("next", "AsyncIteratorHelperNext", 1, 0),
+ JS_SELF_HOSTED_FN("return", "AsyncIteratorHelperReturn", 1, 0),
+ JS_SELF_HOSTED_FN("throw", "AsyncIteratorHelperThrow", 1, 0),
+ JS_FS_END,
+};
+
+static const JSClass AsyncIteratorHelperPrototypeClass = {
+ "Async Iterator Helper", 0};
+
+const JSClass AsyncIteratorHelperObject::class_ = {
+ "Async Iterator Helper",
+ JSCLASS_HAS_RESERVED_SLOTS(AsyncIteratorHelperObject::SlotCount),
+};
+
+/* static */
+NativeObject* GlobalObject::getOrCreateAsyncIteratorHelperPrototype(
+ JSContext* cx, Handle<GlobalObject*> global) {
+ return MaybeNativeObject(getOrCreateObject(
+ cx, global, ASYNC_ITERATOR_HELPER_PROTO, initAsyncIteratorHelperProto));
+}
+
+/* static */
+bool GlobalObject::initAsyncIteratorHelperProto(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ if (global->getReservedSlot(ASYNC_ITERATOR_HELPER_PROTO).isObject()) {
+ return true;
+ }
+
+ RootedObject asyncIterProto(
+ cx, GlobalObject::getOrCreateAsyncIteratorPrototype(cx, global));
+ if (!asyncIterProto) {
+ return false;
+ }
+
+ RootedObject asyncIteratorHelperProto(
+ cx, GlobalObject::createBlankPrototypeInheriting(
+ cx, &AsyncIteratorHelperPrototypeClass, asyncIterProto));
+ if (!asyncIteratorHelperProto) {
+ return false;
+ }
+ if (!DefinePropertiesAndFunctions(cx, asyncIteratorHelperProto, nullptr,
+ async_iterator_helper_methods)) {
+ return false;
+ }
+
+ global->setReservedSlot(ASYNC_ITERATOR_HELPER_PROTO,
+ ObjectValue(*asyncIteratorHelperProto));
+ return true;
+}
+
+AsyncIteratorHelperObject* js::NewAsyncIteratorHelper(JSContext* cx) {
+ RootedObject proto(cx, GlobalObject::getOrCreateAsyncIteratorHelperPrototype(
+ cx, cx->global()));
+ if (!proto) {
+ return nullptr;
+ }
+ return NewObjectWithGivenProto<AsyncIteratorHelperObject>(cx, proto);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 17:32:13 +0000