JSValue JSInjectedScriptHost::iteratorEntries(ExecState* exec)
{
if (exec->argumentCount() < 1)
return jsUndefined();
VM& vm = exec->vm();
JSValue iterator;
JSValue value = exec->uncheckedArgument(0);
if (JSMapIterator* mapIterator = jsDynamicCast<JSMapIterator*>(value))
iterator = mapIterator->clone(exec);
else if (JSSetIterator* setIterator = jsDynamicCast<JSSetIterator*>(value))
iterator = setIterator->clone(exec);
else if (JSStringIterator* stringIterator = jsDynamicCast<JSStringIterator*>(value))
iterator = stringIterator->clone(exec);
else if (JSPropertyNameIterator* propertyNameIterator = jsDynamicCast<JSPropertyNameIterator*>(value)) {
iterator = propertyNameIterator->clone(exec);
if (UNLIKELY(vm.exception()))
return JSValue();
} else {
if (JSObject* iteratorObject = jsDynamicCast<JSObject*>(value)) {
// Array Iterators are created in JS for performance reasons. Thus the only way to know we have one is to
// look for a property that is unique to them.
if (JSValue nextIndex = iteratorObject->getDirect(vm, vm.propertyNames->builtinNames().arrayIteratorNextIndexPrivateName()))
iterator = cloneArrayIteratorObject(exec, vm, iteratorObject, nextIndex);
}
}
if (!iterator)
return jsUndefined();
unsigned numberToFetch = 5;
JSValue numberToFetchArg = exec->argument(1);
double fetchDouble = numberToFetchArg.toInteger(exec);
if (fetchDouble >= 0)
numberToFetch = static_cast<unsigned>(fetchDouble);
JSArray* array = constructEmptyArray(exec, nullptr);
if (UNLIKELY(vm.exception()))
return jsUndefined();
for (unsigned i = 0; i < numberToFetch; ++i) {
JSValue next = iteratorStep(exec, iterator);
if (UNLIKELY(vm.exception()))
break;
if (next.isFalse())
break;
JSValue nextValue = iteratorValue(exec, next);
if (UNLIKELY(vm.exception()))
break;
JSObject* entry = constructEmptyObject(exec);
entry->putDirect(exec->vm(), Identifier::fromString(exec, "value"), nextValue);
array->putDirectIndex(exec, i, entry);
}
iteratorClose(exec, iterator);
return array;
}
static EncodedJSValue JSC_HOST_CALL constructWeakSet(ExecState* exec)
{
JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
Structure* weakSetStructure = globalObject->weakSetStructure();
JSWeakSet* weakSet = JSWeakSet::create(exec, weakSetStructure);
JSValue iterable = exec->argument(0);
if (iterable.isUndefinedOrNull())
return JSValue::encode(weakSet);
JSValue adderFunction = weakSet->JSObject::get(exec, exec->propertyNames().add);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData adderFunctionCallData;
CallType adderFunctionCallType = getCallData(adderFunction, adderFunctionCallData);
if (adderFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
JSValue iteratorFunction = iterable.get(exec, exec->propertyNames().iteratorSymbol);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData iteratorFunctionCallData;
CallType iteratorFunctionCallType = getCallData(iteratorFunction, iteratorFunctionCallData);
if (iteratorFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
ArgList iteratorFunctionArguments;
JSValue iterator = call(exec, iteratorFunction, iteratorFunctionCallType, iteratorFunctionCallData, iterable, iteratorFunctionArguments);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (!iterator.isObject())
return JSValue::encode(throwTypeError(exec));
while (true) {
JSValue next = iteratorStep(exec, iterator);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (next.isFalse())
return JSValue::encode(weakSet);
JSValue nextValue = iteratorValue(exec, next);
if (exec->hadException())
return JSValue::encode(jsUndefined());
MarkedArgumentBuffer arguments;
arguments.append(nextValue);
call(exec, adderFunction, adderFunctionCallType, adderFunctionCallData, weakSet, arguments);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
}
RELEASE_ASSERT_NOT_REACHED();
return JSValue::encode(weakSet);
}
JSValue JSInjectedScriptHost::iteratorEntries(ExecState* exec)
{
if (exec->argumentCount() < 1)
return jsUndefined();
JSValue iterator;
JSValue value = exec->uncheckedArgument(0);
if (JSArrayIterator* arrayIterator = jsDynamicCast<JSArrayIterator*>(value))
iterator = arrayIterator->clone(exec);
else if (JSMapIterator* mapIterator = jsDynamicCast<JSMapIterator*>(value))
iterator = mapIterator->clone(exec);
else if (JSSetIterator* setIterator = jsDynamicCast<JSSetIterator*>(value))
iterator = setIterator->clone(exec);
else if (JSStringIterator* stringIterator = jsDynamicCast<JSStringIterator*>(value))
iterator = stringIterator->clone(exec);
else if (JSPropertyNameIterator* propertyNameIterator = jsDynamicCast<JSPropertyNameIterator*>(value))
iterator = propertyNameIterator->clone(exec);
else
return jsUndefined();
unsigned numberToFetch = 5;
JSValue numberToFetchArg = exec->argument(1);
double fetchDouble = numberToFetchArg.toInteger(exec);
if (fetchDouble >= 0)
numberToFetch = static_cast<unsigned>(fetchDouble);
JSArray* array = constructEmptyArray(exec, nullptr);
for (unsigned i = 0; i < numberToFetch; ++i) {
JSValue next = iteratorStep(exec, iterator);
if (exec->hadException())
break;
if (next.isFalse())
break;
JSValue nextValue = iteratorValue(exec, next);
if (exec->hadException())
break;
JSObject* entry = constructEmptyObject(exec);
entry->putDirect(exec->vm(), Identifier::fromString(exec, "value"), nextValue);
array->putDirectIndex(exec, i, entry);
}
iteratorClose(exec, iterator);
return array;
}
static JSValue performPromiseAll(ExecState* exec, JSValue iterator, JSValue C, JSPromiseDeferred* deferred)
{
JSObject* thisObject = asObject(C);
VM& vm = exec->vm();
// 6. Let 'values' be the result of calling ArrayCreate(0).
JSArray* values = constructEmptyArray(exec, nullptr, thisObject->globalObject());
// 7. Let 'countdownHolder' be Record { [[Countdown]]: 0 }.
NumberObject* countdownHolder = constructNumber(exec, thisObject->globalObject(), JSValue(0));
// 8. Let 'index' be 0.
unsigned index = 0;
// 9. Repeat.
do {
// i. Let 'next' be the result of calling IteratorStep(iterator).
JSValue next = iteratorStep(exec, iterator);
if (exec->hadException())
return jsUndefined();
// iii. If 'next' is false,
if (next.isFalse()) {
// a. If 'index' is 0,
if (!index) {
// a. Let 'resolveResult' be the result of calling the [[Call]] internal method
// of deferred.[[Resolve]] with undefined as thisArgument and a List containing
// values as argumentsList.
performDeferredResolve(exec, deferred, values);
// b. ReturnIfAbrupt(resolveResult).
if (exec->hadException())
return jsUndefined();
}
// b. Return deferred.[[Promise]].
return deferred->promise();
}
// iv. Let 'nextValue' be the result of calling IteratorValue(next).
// v. RejectIfAbrupt(nextValue, deferred).
JSValue nextValue = iteratorValue(exec, next);
if (exec->hadException())
return jsUndefined();
values->push(exec, jsUndefined());
// vi. Let 'nextPromise' be the result of calling Invoke(C, "resolve", (nextValue)).
JSValue resolveFunction = C.get(exec, vm.propertyNames->resolve);
if (exec->hadException())
return jsUndefined();
CallData resolveFunctionCallData;
CallType resolveFunctionCallType = getCallData(resolveFunction, resolveFunctionCallData);
if (resolveFunctionCallType == CallTypeNone) {
throwTypeError(exec);
return jsUndefined();
}
MarkedArgumentBuffer resolveFunctionArguments;
resolveFunctionArguments.append(nextValue);
JSValue nextPromise = call(exec, resolveFunction, resolveFunctionCallType, resolveFunctionCallData, C, resolveFunctionArguments);
// vii. RejectIfAbrupt(nextPromise, deferred).
if (exec->hadException())
return jsUndefined();
// viii. Let 'countdownFunction' be a new built-in function object as defined in Promise.all Countdown Functions.
JSFunction* countdownFunction = createPromiseAllCountdownFunction(vm, thisObject->globalObject());
// ix. Set the [[Index]] internal slot of 'countdownFunction' to 'index'.
countdownFunction->putDirect(vm, vm.propertyNames->indexPrivateName, JSValue(index));
// x. Set the [[Values]] internal slot of 'countdownFunction' to 'values'.
countdownFunction->putDirect(vm, vm.propertyNames->valuesPrivateName, values);
// xi. Set the [[Deferred]] internal slot of 'countdownFunction' to 'deferred'.
countdownFunction->putDirect(vm, vm.propertyNames->deferredPrivateName, deferred);
// xii. Set the [[CountdownHolder]] internal slot of 'countdownFunction' to 'countdownHolder'.
countdownFunction->putDirect(vm, vm.propertyNames->countdownHolderPrivateName, countdownHolder);
// xiii. Let 'result' be the result of calling Invoke(nextPromise, "then", (countdownFunction, deferred.[[Reject]])).
JSValue thenFunction = nextPromise.get(exec, vm.propertyNames->then);
if (exec->hadException())
return jsUndefined();
CallData thenFunctionCallData;
CallType thenFunctionCallType = getCallData(thenFunction, thenFunctionCallData);
if (thenFunctionCallType == CallTypeNone) {
throwTypeError(exec);
return jsUndefined();
}
MarkedArgumentBuffer thenFunctionArguments;
thenFunctionArguments.append(countdownFunction);
thenFunctionArguments.append(deferred->reject());
call(exec, thenFunction, thenFunctionCallType, thenFunctionCallData, nextPromise, thenFunctionArguments);
// xiv. RejectIfAbrupt(result, deferred).
if (exec->hadException())
return jsUndefined();
// xv. Set index to index + 1.
index++;
// xvi. Set countdownHolder.[[Countdown]] to countdownHolder.[[Countdown]] + 1.
uint32_t newCountdownValue = countdownHolder->internalValue().asUInt32() + 1;
countdownHolder->setInternalValue(vm, JSValue(newCountdownValue));
} while (true);
ASSERT_NOT_REACHED();
return jsUndefined();
}
static void performPromiseRaceLoop(ExecState* exec, JSValue iterator, JSPromiseDeferred* deferred, JSValue C)
{
// 6. Repeat
do {
// i. Let 'next' be the result of calling IteratorStep(iterator).
JSValue next = iteratorStep(exec, iterator);
// ii. RejectIfAbrupt(next, deferred).
if (exec->hadException())
return;
// iii. If 'next' is false, return deferred.[[Promise]].
if (next.isFalse())
return;
// iv. Let 'nextValue' be the result of calling IteratorValue(next).
// v. RejectIfAbrupt(nextValue, deferred).
JSValue nextValue = iteratorValue(exec, next);
if (exec->hadException())
return;
// vi. Let 'nextPromise' be the result of calling Invoke(C, "resolve", (nextValue)).
JSValue resolveFunction = C.get(exec, exec->vm().propertyNames->resolve);
if (exec->hadException())
return;
CallData resolveFunctionCallData;
CallType resolveFunctionCallType = getCallData(resolveFunction, resolveFunctionCallData);
if (resolveFunctionCallType == CallTypeNone) {
throwTypeError(exec);
return;
}
MarkedArgumentBuffer resolveFunctionArguments;
resolveFunctionArguments.append(nextValue);
JSValue nextPromise = call(exec, resolveFunction, resolveFunctionCallType, resolveFunctionCallData, C, resolveFunctionArguments);
// vii. RejectIfAbrupt(nextPromise, deferred).
if (exec->hadException())
return;
// viii. Let 'result' be the result of calling Invoke(nextPromise, "then", (deferred.[[Resolve]], deferred.[[Reject]])).
JSValue thenFunction = nextPromise.get(exec, exec->vm().propertyNames->then);
if (exec->hadException())
return;
CallData thenFunctionCallData;
CallType thenFunctionCallType = getCallData(thenFunction, thenFunctionCallData);
if (thenFunctionCallType == CallTypeNone) {
throwTypeError(exec);
return;
}
MarkedArgumentBuffer thenFunctionArguments;
thenFunctionArguments.append(deferred->resolve());
thenFunctionArguments.append(deferred->reject());
call(exec, thenFunction, thenFunctionCallType, thenFunctionCallData, nextPromise, thenFunctionArguments);
// ix. RejectIfAbrupt(result, deferred).
if (exec->hadException())
return;
} while (true);
}
static EncodedJSValue JSC_HOST_CALL constructMap(ExecState* exec)
{
JSValue prototype = JSValue();
JSValue newTarget = exec->newTarget();
if (newTarget != exec->callee())
prototype = newTarget.get(exec, exec->propertyNames().prototype);
JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
Structure* mapStructure = Structure::createSubclassStructure(exec->vm(), globalObject->mapStructure(), prototype);
JSMap* map = JSMap::create(exec, mapStructure);
JSValue iterable = exec->argument(0);
if (iterable.isUndefinedOrNull())
return JSValue::encode(map);
JSValue adderFunction = map->JSObject::get(exec, exec->propertyNames().set);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData adderFunctionCallData;
CallType adderFunctionCallType = getCallData(adderFunction, adderFunctionCallData);
if (adderFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
JSValue iteratorFunction = iterable.get(exec, exec->propertyNames().iteratorSymbol);
if (exec->hadException())
return JSValue::encode(jsUndefined());
CallData iteratorFunctionCallData;
CallType iteratorFunctionCallType = getCallData(iteratorFunction, iteratorFunctionCallData);
if (iteratorFunctionCallType == CallTypeNone)
return JSValue::encode(throwTypeError(exec));
ArgList iteratorFunctionArguments;
JSValue iterator = call(exec, iteratorFunction, iteratorFunctionCallType, iteratorFunctionCallData, iterable, iteratorFunctionArguments);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (!iterator.isObject())
return JSValue::encode(throwTypeError(exec));
while (true) {
JSValue next = iteratorStep(exec, iterator);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (next.isFalse())
return JSValue::encode(map);
JSValue nextItem = iteratorValue(exec, next);
if (exec->hadException())
return JSValue::encode(jsUndefined());
if (!nextItem.isObject()) {
throwTypeError(exec);
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
JSValue key = nextItem.get(exec, 0);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
JSValue value = nextItem.get(exec, 1);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
MarkedArgumentBuffer arguments;
arguments.append(key);
arguments.append(value);
call(exec, adderFunction, adderFunctionCallType, adderFunctionCallData, map, arguments);
if (exec->hadException()) {
iteratorClose(exec, iterator);
return JSValue::encode(jsUndefined());
}
}
RELEASE_ASSERT_NOT_REACHED();
return JSValue::encode(map);
}
