WIP: Base implementation

2 files changed, 317 insertions, 0 deletions

diff --git a/js/src/builtin/Promise.cpp b/js/src/builtin/Promise.cpp
index 9b461e487..8ead6d9e7 100644
--- a/js/src/builtin/Promise.cpp
+++ b/js/src/builtin/Promise.cpp
@@ -1529,12 +1529,63 @@ Promise_static_all(JSContext* cx, unsigned argc, Value* vp)
     return true;
 }
 
+static MOZ_MUST_USE bool PerformPromiseAllSettled(JSContext *cx, JS::ForOfIterator& iterator,
+                                                  HandleObject C, HandleObject promiseObj,
+                                                  HandleObject resolve, HandleObject reject,
+                                                  bool* done);
+
+// ES2020
+static bool
+Promise_static_allSettled(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    RootedValue iterable(cx, args.get(0));
+    RootedValue CVal(cx, args.thisv());
+    if (!CVal.isObject()) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT,
+                                  "Receiver of Promise.allSettled call");
+        return false;
+    }
+
+    RootedObject C(cx, &CVal.toObject());
+    RootedObject resultPromise(cx);
+    RootedObject resolve(cx);
+    RootedObject reject(cx);
+    if (!NewPromiseCapability(cx, C, &resultPromise, &resolve, &reject, false))
+        return false;
+
+    JS::ForOfIterator iter(cx);
+    if (!iter.init(iterable, JS::ForOfIterator::AllowNonIterable))
+        return AbruptRejectPromise(cx, args, resultPromise, reject);
+
+    if (!iter.valueIsIterable()) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_NOT_ITERABLE,
+                                  "Argument of Promise.allSettled");
+        return AbruptRejectPromise(cx, args, resultPromise, reject);
+    }
+
+    bool done;
+    bool result = PerformPromiseAllSettled(cx, iter, C, resultPromise, resolve, reject, &done);
+
+    if (!result) {
+        if (!done)
+            iter.closeThrow();
+
+        return AbruptRejectPromise(cx, args, resultPromise, reject);
+    }
+
+    args.rval().setObject(*resultPromise);
+    return true;
+}
+
 static MOZ_MUST_USE bool PerformPromiseThen(JSContext* cx, Handle<PromiseObject*> promise,
                                             HandleValue onFulfilled_, HandleValue onRejected_,
                                             HandleObject resultPromise,
                                             HandleObject resolve, HandleObject reject);
 
 static bool PromiseAllResolveElementFunction(JSContext* cx, unsigned argc, Value* vp);
+static bool PromiseAllSettledResolveElementFunction(JSContext* cx, unsigned argc, Value* vp);
+static bool PromiseAllSettledRejectElementFunction(JSContext* cx, unsigned argc, Value* vp);
 
 // Unforgeable version of ES2016, 25.4.4.1.
 MOZ_MUST_USE JSObject*
@@ -1848,6 +1899,117 @@ PerformPromiseAll(JSContext *cx, JS::ForOfIterator& iterator, HandleObject C,
     }
 }
 
+static MOZ_MUST_USE bool
+PerformPromiseAllSettled(JSContext *cx, JS::ForOfIterator& iterator, HandleObject C,
+                         HandleObject promiseObj, HandleObject resolve, HandleObject reject,
+                         bool* done)
+{
+    *done = false;
+
+    RootedObject unwrappedPromiseObj(cx);
+    if (IsWrapper(promiseObj)) {
+        unwrappedPromiseObj = CheckedUnwrap(promiseObj);
+        MOZ_ASSERT(unwrappedPromiseObj);
+    }
+
+    RootedValue CVal(cx, ObjectValue(*C));
+
+    RootedObject valuesArray(cx);
+    if (unwrappedPromiseObj) {
+        JSAutoCompartment ac(cx, unwrappedPromiseObj);
+        valuesArray = NewDenseFullyAllocatedArray(cx, 0);
+    } else {
+        valuesArray = NewDenseFullyAllocatedArray(cx, 0);
+    }
+    if (!valuesArray)
+        return false;
+
+    RootedValue valuesArrayVal(cx, ObjectValue(*valuesArray));
+    if (!cx->compartment()->wrap(cx, &valuesArrayVal))
+        return false;
+
+    Rooted<PromiseAllDataHolder*> dataHolder(cx, NewPromiseAllDataHolder(cx, promiseObj,
+                                                                         valuesArrayVal, resolve));
+    if (!dataHolder)
+        return false;
+    RootedValue dataHolderVal(cx, ObjectValue(*dataHolder));
+
+    uint32_t index = 0;
+
+    RootedValue nextValue(cx);
+    RootedId indexId(cx);
+
+    while (true) {
+        if (!iterator.next(&nextValue, done)) {
+            *done = true;
+            return false;
+        }
+
+        if (*done) {
+            int32_t remainingCount = dataHolder->decreaseRemainingCount();
+            if (remainingCount == 0) {
+                return RunResolutionFunction(cx, resolve, valuesArrayVal, ResolveMode,
+                                             promiseObj);
+            }
+            return true;
+        }
+
+        { // Scoped for AutoCompartment
+            JSAutoCompartment ac(cx, valuesArray);
+            indexId = INT_TO_JSID(index);
+            if (!DefineProperty(cx, valuesArray, indexId, UndefinedHandleValue))
+                return false;
+        }
+
+        RootedValue nextPromise(cx);
+        RootedValue staticResolve(cx);
+        if (!GetProperty(cx, CVal, cx->names().resolve, &staticResolve))
+            return false;
+        RootedValue staticReject(cx);
+        if (!GetProperty(cx, CVal, cx->names().reject, &staticReject))
+            return false;
+
+        FixedInvokeArgs<1> resolveArgs(cx);
+        resolveArgs[0].set(nextValue);
+        if (!Call(cx, staticResolve, CVal, resolveArgs, &nextPromise))
+            return false;
+        FixedInvokeArgs<1> rejectArgs(cx);
+        rejectArgs[0].set(nextValue);
+        if (!Call(cx, staticReject, CVal, rejectArgs, &nextPromise))
+            return false;
+
+        RootedFunction resolveFunc(cx, NewNativeFunction(cx, PromiseAllSettledResolveElementFunction,
+                                                         1, nullptr,
+                                                         gc::AllocKind::FUNCTION_EXTENDED,
+                                                         GenericObject));
+        if (!resolveFunc)
+            return false;
+        RootedFunction rejectFunc(cx, NewNativeFunction(cx, PromiseAllSettledRejectElementFunction,
+                                                        1, nullptr,
+                                                        gc::AllocKind::FUNCTION_EXTENDED,
+                                                        GenericObject));
+        if (!rejectFunc)
+            return false;
+
+        resolveFunc->setExtendedSlot(PromiseAllResolveElementFunctionSlot_Data, dataHolderVal);
+        resolveFunc->setExtendedSlot(PromiseAllResolveElementFunctionSlot_ElementIndex,
+                                     Int32Value(index));
+        rejectFunc->setExtendedSlot(PromiseAllResolveElementFunctionSlot_Data, dataHolderVal);
+        rejectFunc->setExtendedSlot(PromiseAllResolveElementFunctionSlot_ElementIndex,
+                                    Int32Value(index));
+
+        dataHolder->increaseRemainingCount();
+
+        RootedValue resolveFunVal(cx, ObjectValue(*resolveFunc));
+        RootedValue rejectFunVal(cx, ObjectValue(*rejectFunc));
+        if (!BlockOnPromise(cx, nextPromise, promiseObj, resolveFunVal, rejectFunVal))
+            return false;
+
+        index++;
+        MOZ_ASSERT(index > 0);
+    }
+}
+
 // ES2016, 25.4.4.1.2.
 static bool
 PromiseAllResolveElementFunction(JSContext* cx, unsigned argc, Value* vp)
@@ -1921,6 +2083,159 @@ PromiseAllResolveElementFunction(JSContext* cx, unsigned argc, Value* vp)
     return true;
 }
 
+// ES2020.
+static bool
+PromiseAllSettledResolveElementFunction(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    RootedFunction resolve(cx, &args.callee().as<JSFunction>());
+    RootedValue xVal(cx, args.get(0));
+    RootedValue dataVal(cx, resolve->getExtendedSlot(PromiseAllResolveElementFunctionSlot_Data));
+
+    if (dataVal.isUndefined()) {
+        args.rval().setUndefined();
+        return true;
+    }
+
+    Rooted<PromiseAllDataHolder*> data(cx, &dataVal.toObject().as<PromiseAllDataHolder>());
+
+    resolve->setExtendedSlot(PromiseAllResolveElementFunctionSlot_Data, UndefinedValue());
+
+    int32_t index = resolve->getExtendedSlot(PromiseAllResolveElementFunctionSlot_ElementIndex)
+                    .toInt32();
+
+    RootedValue valuesVal(cx, data->valuesArray());
+    RootedObject valuesObj(cx, &valuesVal.toObject());
+    bool valuesListIsWrapped = false;
+    if (IsWrapper(valuesObj)) {
+        valuesListIsWrapped = true;
+        // See comment for PerformPromiseAll, step 3 for why we unwrap here.
+        valuesObj = UncheckedUnwrap(valuesObj);
+    }
+    NativeObject* values = &valuesObj->as<NativeObject>();
+
+    // The index is guaranteed to be initialized to `undefined`.
+    if (valuesListIsWrapped) {
+        AutoCompartment ac(cx, values);
+        if (!cx->compartment()->wrap(cx, &xVal))
+            return false;
+    }
+    
+    RootedPlainObject obj(cx, NewBuiltinClassInstance<PlainObject>(cx));
+    if (!obj) {
+        return false;
+    }
+    RootedId id(cx, NameToId(cx->names().status));
+    RootedValue statusValue(cx);
+    statusValue.setString(cx->names().fulfilled);
+    if (!::JS_DefinePropertyById(cx, obj, id, statusValue, JSPROP_ENUMERATE)) {
+      return false;
+    }
+    id = NameToId(cx->names().value);
+    if (!::JS_DefinePropertyById(cx, obj, id, xVal, JSPROP_ENUMERATE)) {
+      return false;
+    }
+
+    RootedValue objVal(cx, ObjectValue(*obj));

+/*  if (needsWrapping) {

+    AutoRealm ar(cx, valuesObj);

+    if (!cx->compartment()->wrap(cx, &objVal)) {

+      return false;

+    }

+  }    */
+    values->setDenseElement(index, objVal);
+
+    uint32_t remainingCount = data->decreaseRemainingCount();
+
+    if (remainingCount == 0) {
+        RootedObject resolveAllFun(cx, data->resolveObj());
+        RootedObject promiseObj(cx, data->promiseObj());
+        if (!RunResolutionFunction(cx, resolveAllFun, valuesVal, ResolveMode, promiseObj))
+            return false;
+    }
+
+    args.rval().setUndefined();
+    return true;
+}
+
+static bool
+PromiseAllSettledRejectElementFunction(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+
+    RootedFunction resolve(cx, &args.callee().as<JSFunction>());
+    RootedValue xVal(cx, args.get(0));
+    RootedValue dataVal(cx, resolve->getExtendedSlot(PromiseAllResolveElementFunctionSlot_Data));
+
+    if (dataVal.isUndefined()) {
+        args.rval().setUndefined();
+        return true;
+    }
+
+    Rooted<PromiseAllDataHolder*> data(cx, &dataVal.toObject().as<PromiseAllDataHolder>());
+
+    resolve->setExtendedSlot(PromiseAllResolveElementFunctionSlot_Data, UndefinedValue());
+
+    int32_t index = resolve->getExtendedSlot(PromiseAllResolveElementFunctionSlot_ElementIndex)
+                    .toInt32();
+
+    RootedValue valuesVal(cx, data->valuesArray());
+    RootedObject valuesObj(cx, &valuesVal.toObject());
+    bool valuesListIsWrapped = false;
+    if (IsWrapper(valuesObj)) {
+        valuesListIsWrapped = true;
+        // See comment for PerformPromiseAll, step 3 for why we unwrap here.
+        valuesObj = UncheckedUnwrap(valuesObj);
+    }
+    NativeObject* values = &valuesObj->as<NativeObject>();
+
+    // The index is guaranteed to be initialized to `undefined`.
+    if (valuesListIsWrapped) {
+        AutoCompartment ac(cx, values);
+        if (!cx->compartment()->wrap(cx, &xVal))
+            return false;
+    }
+    
+    RootedPlainObject obj(cx, NewBuiltinClassInstance<PlainObject>(cx));
+    if (!obj) {
+        return false;
+    }
+    RootedId id(cx, NameToId(cx->names().status));
+    RootedValue statusValue(cx);
+    statusValue.setString(cx->names().rejected);
+    if (!::JS_DefinePropertyById(cx, obj, id, statusValue, JSPROP_ENUMERATE)) {
+      return false;
+    }
+    RootedValue resultValue(cx);
+    id = NameToId(cx->names().reason);
+    if (!::JS_DefinePropertyById(cx, obj, id, xVal, JSPROP_ENUMERATE)) {
+      return false;
+    }
+
+    RootedValue objVal(cx, ObjectValue(*obj));

+/*  if (needsWrapping) {

+    AutoRealm ar(cx, valuesObj);

+    if (!cx->compartment()->wrap(cx, &objVal)) {

+      return false;

+    }

+  }    */
+    values->setDenseElement(index, objVal);    
+
+
+    uint32_t remainingCount = data->decreaseRemainingCount();
+
+    if (remainingCount == 0) {
+        RootedObject resolveAllFun(cx, data->resolveObj());
+        RootedObject promiseObj(cx, data->promiseObj());
+        if (!RunResolutionFunction(cx, resolveAllFun, valuesVal, ResolveMode, promiseObj))
+            return false;
+    }
+
+    args.rval().setUndefined();
+    return true;
+}
+
 static MOZ_MUST_USE bool PerformPromiseRace(JSContext *cx, JS::ForOfIterator& iterator,
                                             HandleObject C, HandleObject promiseObj,
                                             HandleObject resolve, HandleObject reject,
@@ -3246,6 +3561,7 @@ static const JSPropertySpec promise_properties[] = {
 
 static const JSFunctionSpec promise_static_methods[] = {
     JS_FN("all", Promise_static_all, 1, 0),
+    JS_FN("allSettled", Promise_static_allSettled, 1, 0),
     JS_FN("race", Promise_static_race, 1, 0),
     JS_FN("reject", Promise_reject, 1, 0),
     JS_FN("resolve", Promise_static_resolve, 1, 0),
diff --git a/js/src/vm/CommonPropertyNames.h b/js/src/vm/CommonPropertyNames.h
index 7df7563b5..445b8a6bb 100644
--- a/js/src/vm/CommonPropertyNames.h
+++ b/js/src/vm/CommonPropertyNames.h
@@ -325,6 +325,7 @@
     macro(startTimestamp, startTimestamp, "startTimestamp") \
     macro(state, state, "state") \
     macro(static, static_, "static") \
+    macro(status, status, "status") \
     macro(std_Function_apply, std_Function_apply, "std_Function_apply") \
     macro(sticky, sticky, "sticky") \
     macro(StringIterator, StringIterator, "String Iterator") \