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-rw-r--r--js/src/vm/AsyncIteration.cpp125
-rw-r--r--js/src/vm/AsyncIteration.h26
-rw-r--r--js/src/vm/CommonPropertyNames.h1
-rw-r--r--js/src/vm/GlobalObject.h7
-rw-r--r--js/src/vm/Interpreter.cpp16
-rw-r--r--js/src/vm/Interpreter.h3
-rw-r--r--js/src/vm/Opcodes.h10
7 files changed, 159 insertions, 29 deletions
diff --git a/js/src/vm/AsyncIteration.cpp b/js/src/vm/AsyncIteration.cpp
index 04effe1b1..74f6389c1 100644
--- a/js/src/vm/AsyncIteration.cpp
+++ b/js/src/vm/AsyncIteration.cpp
@@ -148,6 +148,69 @@ js::AsyncGeneratorAwaitedRejected(JSContext* cx, Handle<AsyncGeneratorObject*> a
return AsyncGeneratorResume(cx, asyncGenObj, CompletionKind::Throw, reason);
}
+const Class AsyncFromSyncIteratorObject::class_ = {
+ "AsyncFromSyncIteratorObject",
+ JSCLASS_HAS_RESERVED_SLOTS(AsyncFromSyncIteratorObject::Slots)
+};
+
+// Async Iteration proposal 6.1.3.1.
+JSObject*
+js::CreateAsyncFromSyncIterator(JSContext* cx, HandleObject iter)
+{
+ // Step 1 (implicit).
+ // Done in bytecode emitted by emitAsyncIterator.
+
+ // Steps 2-4.
+ return AsyncFromSyncIteratorObject::create(cx, iter);
+}
+
+// Async Iteration proposal 6.1.3.1 steps 2-4.
+/* static */ JSObject*
+AsyncFromSyncIteratorObject::create(JSContext* cx, HandleObject iter)
+{
+ // Step 2.
+ RootedObject proto(cx, GlobalObject::getOrCreateAsyncFromSyncIteratorPrototype(cx,
+ cx->global()));
+ if (!proto)
+ return nullptr;
+
+ RootedObject obj(cx, NewNativeObjectWithGivenProto(cx, &class_, proto));
+ if (!obj)
+ return nullptr;
+
+ Handle<AsyncFromSyncIteratorObject*> asyncIter = obj.as<AsyncFromSyncIteratorObject>();
+
+ // Step 3.
+ asyncIter->setIterator(iter);
+
+ // Step 4.
+ return asyncIter;
+}
+
+// Async Iteration proposal 6.1.3.2.1 %AsyncFromSyncIteratorPrototype%.next.
+static bool
+AsyncFromSyncIteratorNext(JSContext* cx, unsigned argc, Value* vp)
+{
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return AsyncFromSyncIteratorMethod(cx, args, CompletionKind::Normal);
+}
+
+// Async Iteration proposal 6.1.3.2.2 %AsyncFromSyncIteratorPrototype%.return.
+static bool
+AsyncFromSyncIteratorReturn(JSContext* cx, unsigned argc, Value* vp)
+{
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return AsyncFromSyncIteratorMethod(cx, args, CompletionKind::Return);
+}
+
+// Async Iteration proposal 6.1.3.2.3 %AsyncFromSyncIteratorPrototype%.throw.
+static bool
+AsyncFromSyncIteratorThrow(JSContext* cx, unsigned argc, Value* vp)
+{
+ CallArgs args = CallArgsFromVp(argc, vp);
+ return AsyncFromSyncIteratorMethod(cx, args, CompletionKind::Throw);
+}
+
// Async Iteration proposal 6.4.1.2 AsyncGenerator.prototype.next.
static bool
AsyncGeneratorNext(JSContext* cx, unsigned argc, Value* vp)
@@ -413,17 +476,17 @@ js::AsyncGeneratorResumeNext(JSContext* cx, Handle<AsyncGeneratorObject*> asyncG
return AsyncGeneratorResume(cx, asyncGenObj, completionKind, argument);
}
-// Async Iteration proposal 6.2.1.2 (partially).
+// Async Iteration proposal 6.2.1.3 (partially).
// Most steps are done in generator.
static MOZ_MUST_USE bool
AsyncGeneratorYield(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
- HandleValue value, bool done)
+ HandleValue value)
{
- // Step 6.
+ // Step 5.
asyncGenObj->setSuspendedYield();
- // Step 10.c.
- return AsyncGeneratorResolve(cx, asyncGenObj, value, done);
+ // Step 8.
+ return AsyncGeneratorResolve(cx, asyncGenObj, value, false);
}
// Async Iteration proposal 6.4.3.5 steps 12-14, 16-20.
@@ -451,41 +514,30 @@ AsyncGeneratorResume(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
return AsyncGeneratorThrown(cx, asyncGenObj);
}
+ if (asyncGenObj->generatorObj()->isAfterAwait())
+ return AsyncGeneratorAwait(cx, asyncGenObj, result);
+
// The following code corresponds to the following 3 cases:
// * yield
- // * await
+ // * yield*
// * return
- // For await and return, property access is done on an internal result
+ // For yield and return, property access is done on an internal result
// object and it's not observable.
- // For yield, it's done on an user-provided result object, and it's
- // observable, so perform in that order in all cases.
+ // For yield*, it's done on a possibly user-provided result object, and
+ // it's observable.
+ // 2.2.1 yield* steps 6.a.vii, 6.b.ii.7, 6.c.ix.
RootedObject resultObj(cx, &result.toObject());
RootedValue value(cx);
- RootedValue doneVal(cx);
- // 6.2.1.2 step 10.a.
if (!GetProperty(cx, resultObj, resultObj, cx->names().value, &value))
return false;
- // 6.2.1.2 step 10.b.
- if (!GetProperty(cx, resultObj, resultObj, cx->names().done, &doneVal))
- return false;
-
- // 6.2.1.2 step 10.c.
if (asyncGenObj->generatorObj()->isAfterYield())
- return AsyncGeneratorYield(cx, asyncGenObj, value, ToBoolean(doneVal));
+ return AsyncGeneratorYield(cx, asyncGenObj, value);
// 6.4.3.2 step 5.d-g.
- if (ToBoolean(doneVal)) {
- MOZ_ASSERT(!asyncGenObj->generatorObj()->isAfterAwait());
- return AsyncGeneratorReturned(cx, asyncGenObj, value);
- }
-
- MOZ_ASSERT(asyncGenObj->generatorObj()->isAfterAwait());
-
- // 5.1 steps 2-9.
- return AsyncGeneratorAwait(cx, asyncGenObj, value);
+ return AsyncGeneratorReturned(cx, asyncGenObj, value);
}
static const JSFunctionSpec async_iterator_proto_methods[] = {
@@ -493,6 +545,13 @@ static const JSFunctionSpec async_iterator_proto_methods[] = {
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", AsyncGeneratorNext, 1, 0),
JS_FN("throw", AsyncGeneratorThrow, 1, 0),
@@ -513,6 +572,19 @@ GlobalObject::initAsyncGenerators(JSContext* cx, Handle<GlobalObject*> global)
if (!DefinePropertiesAndFunctions(cx, asyncIterProto, nullptr, async_iterator_proto_methods))
return false;
+ // Async Iteration proposal 6.1.3.2 %AsyncFromSyncIteratorPrototype%.
+ RootedObject asyncFromSyncIterProto(
+ cx, GlobalObject::createBlankPrototypeInheriting(cx, global, &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;
+ }
+
// Async Iteration proposal 6.4.1 %AsyncGeneratorPrototype%.
RootedObject asyncGenProto(
cx, GlobalObject::createBlankPrototypeInheriting(cx, global, &PlainObject::class_,
@@ -557,6 +629,7 @@ GlobalObject::initAsyncGenerators(JSContext* cx, Handle<GlobalObject*> global)
}
global->setReservedSlot(ASYNC_ITERATOR_PROTO, ObjectValue(*asyncIterProto));
+ global->setReservedSlot(ASYNC_FROM_SYNC_ITERATOR_PROTO, ObjectValue(*asyncFromSyncIterProto));
global->setReservedSlot(ASYNC_GENERATOR, ObjectValue(*asyncGenerator));
global->setReservedSlot(ASYNC_GENERATOR_FUNCTION, ObjectValue(*asyncGenFunction));
global->setReservedSlot(ASYNC_GENERATOR_PROTO, ObjectValue(*asyncGenProto));
diff --git a/js/src/vm/AsyncIteration.h b/js/src/vm/AsyncIteration.h
index c0135283f..974c209a0 100644
--- a/js/src/vm/AsyncIteration.h
+++ b/js/src/vm/AsyncIteration.h
@@ -196,6 +196,32 @@ class AsyncGeneratorObject : public NativeObject
}
};
+JSObject*
+CreateAsyncFromSyncIterator(JSContext* cx, HandleObject iter);
+
+class AsyncFromSyncIteratorObject : public NativeObject
+{
+ private:
+ enum AsyncFromSyncIteratorObjectSlots {
+ Slot_Iterator = 0,
+ Slots
+ };
+
+ void setIterator(HandleObject iterator_) {
+ setFixedSlot(Slot_Iterator, ObjectValue(*iterator_));
+ }
+
+ public:
+ static const Class class_;
+
+ static JSObject*
+ create(JSContext* cx, HandleObject iter);
+
+ JSObject* iterator() const {
+ return &getFixedSlot(Slot_Iterator).toObject();
+ }
+};
+
MOZ_MUST_USE bool
AsyncGeneratorResumeNext(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj);
diff --git a/js/src/vm/CommonPropertyNames.h b/js/src/vm/CommonPropertyNames.h
index 4a9c03e88..6a8afb56b 100644
--- a/js/src/vm/CommonPropertyNames.h
+++ b/js/src/vm/CommonPropertyNames.h
@@ -29,6 +29,7 @@
macro(ArrayValuesAt, ArrayValuesAt, "ArrayValuesAt") \
macro(as, as, "as") \
macro(Async, Async, "Async") \
+ macro(AsyncFromSyncIterator, AsyncFromSyncIterator, "Async-from-Sync Iterator") \
macro(AsyncFunction, AsyncFunction, "AsyncFunction") \
macro(AsyncGenerator, AsyncGenerator, "AsyncGenerator") \
macro(AsyncGeneratorFunction, AsyncGeneratorFunction, "AsyncGeneratorFunction") \
diff --git a/js/src/vm/GlobalObject.h b/js/src/vm/GlobalObject.h
index ce802daba..3fd2762f8 100644
--- a/js/src/vm/GlobalObject.h
+++ b/js/src/vm/GlobalObject.h
@@ -101,6 +101,7 @@ class GlobalObject : public NativeObject
ASYNC_FUNCTION_PROTO,
ASYNC_FUNCTION,
ASYNC_ITERATOR_PROTO,
+ ASYNC_FROM_SYNC_ITERATOR_PROTO,
ASYNC_GENERATOR,
ASYNC_GENERATOR_FUNCTION,
ASYNC_GENERATOR_PROTO,
@@ -636,6 +637,12 @@ class GlobalObject : public NativeObject
}
static NativeObject*
+ getOrCreateAsyncFromSyncIteratorPrototype(JSContext* cx, Handle<GlobalObject*> global) {
+ return MaybeNativeObject(getOrCreateObject(cx, global, ASYNC_FROM_SYNC_ITERATOR_PROTO,
+ initAsyncGenerators));
+ }
+
+ static NativeObject*
getOrCreateAsyncGenerator(JSContext* cx, Handle<GlobalObject*> global) {
return MaybeNativeObject(getOrCreateObject(cx, global, ASYNC_GENERATOR,
initAsyncGenerators));
diff --git a/js/src/vm/Interpreter.cpp b/js/src/vm/Interpreter.cpp
index 4d5927324..3cf9b57f6 100644
--- a/js/src/vm/Interpreter.cpp
+++ b/js/src/vm/Interpreter.cpp
@@ -1940,7 +1940,6 @@ CASE(EnableInterruptsPseudoOpcode)
CASE(JSOP_NOP)
CASE(JSOP_NOP_DESTRUCTURING)
CASE(JSOP_UNUSED126)
-CASE(JSOP_UNUSED210)
CASE(JSOP_UNUSED211)
CASE(JSOP_TRY_DESTRUCTURING_ITERCLOSE)
CASE(JSOP_UNUSED221)
@@ -3596,6 +3595,17 @@ CASE(JSOP_TOASYNCGEN)
}
END_CASE(JSOP_TOASYNCGEN)
+CASE(JSOP_TOASYNCITER)
+{
+ ReservedRooted<JSObject*> iter(&rootObject1, &REGS.sp[-1].toObject());
+ JSObject* asyncIter = CreateAsyncFromSyncIterator(cx, iter);
+ if (!asyncIter)
+ goto error;
+
+ REGS.sp[-1].setObject(*asyncIter);
+}
+END_CASE(JSOP_TOASYNCITER)
+
CASE(JSOP_SETFUNNAME)
{
MOZ_ASSERT(REGS.stackDepth() >= 2);
@@ -5138,6 +5148,10 @@ js::ThrowCheckIsObject(JSContext* cx, CheckIsObjectKind kind)
case CheckIsObjectKind::GetIterator:
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_GET_ITER_RETURNED_PRIMITIVE);
break;
+ case CheckIsObjectKind::GetAsyncIterator:
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_GET_ASYNC_ITER_RETURNED_PRIMITIVE);
+ break;
default:
MOZ_CRASH("Unknown kind");
}
diff --git a/js/src/vm/Interpreter.h b/js/src/vm/Interpreter.h
index 9fefd75cc..5e7087f7f 100644
--- a/js/src/vm/Interpreter.h
+++ b/js/src/vm/Interpreter.h
@@ -561,7 +561,8 @@ enum class CheckIsObjectKind : uint8_t {
IteratorNext,
IteratorReturn,
IteratorThrow,
- GetIterator
+ GetIterator,
+ GetAsyncIterator
};
bool
diff --git a/js/src/vm/Opcodes.h b/js/src/vm/Opcodes.h
index fc7fbbe66..e13cd6221 100644
--- a/js/src/vm/Opcodes.h
+++ b/js/src/vm/Opcodes.h
@@ -2136,7 +2136,15 @@
* Stack: promise, gen => resolved
*/ \
macro(JSOP_AWAIT, 209, "await", NULL, 4, 2, 1, JOF_UINT24) \
- macro(JSOP_UNUSED210, 210, "unused210", NULL, 1, 0, 0, JOF_BYTE) \
+ /*
+ * Pops the iterator from the top of the stack, and create async iterator
+ * from it and push the async iterator back onto the stack.
+ * Category: Statements
+ * Type: Generator
+ * Operands:
+ * Stack: iter => asynciter
+ */ \
+ macro(JSOP_TOASYNCITER, 210, "toasynciter", NULL, 1, 1, 1, JOF_BYTE) \
macro(JSOP_UNUSED211, 211, "unused211", NULL, 1, 0, 0, JOF_BYTE) \
/*
* Initializes generator frame, creates a generator and pushes it on the
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 09:15:57 +0000