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JavascriptPromise.cpp
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JavascriptPromise.cpp
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//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Copyright (c) 2021 ChakraCore Project Contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------
#include "RuntimeLibraryPch.h"
namespace Js
{
JavascriptPromise::JavascriptPromise(DynamicType * type)
: DynamicObject(type),
isHandled(false),
status(PromiseStatus::PromiseStatusCode_Undefined),
result(nullptr),
reactions(nullptr)
{
Assert(type->GetTypeId() == TypeIds_Promise);
}
// Promise() as defined by ES 2016 Sections 25.4.3.1
Var JavascriptPromise::NewInstance(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
AssertMsg(args.Info.Count > 0, "Should always have implicit 'this'");
ScriptContext* scriptContext = function->GetScriptContext();
JavascriptLibrary* library = scriptContext->GetLibrary();
CHAKRATEL_LANGSTATS_INC_LANGFEATURECOUNT(ES6, Promise, scriptContext);
// SkipDefaultNewObject function flag should have prevented the default object from
// being created, except when call true a host dispatch
Var newTarget = args.GetNewTarget();
bool isCtorSuperCall = JavascriptOperators::GetAndAssertIsConstructorSuperCall(args);
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise"));
// 1. If NewTarget is undefined, throw a TypeError exception.
if ((callInfo.Flags & CallFlags_New) != CallFlags_New || (newTarget != nullptr && JavascriptOperators::IsUndefined(newTarget)))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_ClassConstructorCannotBeCalledWithoutNew, _u("Promise"));
}
// 2. If IsCallable(executor) is false, throw a TypeError exception.
if (args.Info.Count < 2 || !JavascriptConversion::IsCallable(args[1]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_FunctionArgument_NeedFunction, _u("Promise"));
}
RecyclableObject* executor = VarTo<RecyclableObject>(args[1]);
// 3. Let promise be ? OrdinaryCreateFromConstructor(NewTarget, "%PromisePrototype%", <<[[PromiseState]], [[PromiseResult]], [[PromiseFulfillReactions]], [[PromiseRejectReactions]], [[PromiseIsHandled]] >>).
JavascriptPromise* promise = library->CreatePromise();
if (isCtorSuperCall)
{
JavascriptOperators::OrdinaryCreateFromConstructor(VarTo<RecyclableObject>(newTarget), promise, library->GetPromisePrototype(), scriptContext);
}
JavascriptPromiseResolveOrRejectFunction* resolve;
JavascriptPromiseResolveOrRejectFunction* reject;
// 4. Set promise's [[PromiseState]] internal slot to "pending".
// 5. Set promise's [[PromiseFulfillReactions]] internal slot to a new empty List.
// 6. Set promise's [[PromiseRejectReactions]] internal slot to a new empty List.
// 7. Set promise's [[PromiseIsHandled]] internal slot to false.
// 8. Let resolvingFunctions be CreateResolvingFunctions(promise).
InitializePromise(promise, &resolve, &reject, scriptContext);
JavascriptExceptionObject* exception = nullptr;
// 9. Let completion be Call(executor, undefined, << resolvingFunctions.[[Resolve]], resolvingFunctions.[[Reject]] >>).
try
{
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
CALL_FUNCTION(scriptContext->GetThreadContext(),
executor, CallInfo(CallFlags_Value, 3),
library->GetUndefined(),
resolve,
reject);
}
END_SAFE_REENTRANT_CALL
}
catch (const JavascriptException& err)
{
exception = err.GetAndClear();
}
if (exception != nullptr)
{
// 10. If completion is an abrupt completion, then
// a. Perform ? Call(resolvingFunctions.[[Reject]], undefined, << completion.[[Value]] >>).
TryRejectWithExceptionObject(exception, reject, scriptContext);
}
// 11. Return promise.
return promise;
}
void JavascriptPromise::InitializePromise(JavascriptPromise* promise, JavascriptPromiseResolveOrRejectFunction** resolve, JavascriptPromiseResolveOrRejectFunction** reject, ScriptContext* scriptContext)
{
Assert(promise->GetStatus() == PromiseStatusCode_Undefined);
Assert(resolve);
Assert(reject);
Recycler* recycler = scriptContext->GetRecycler();
JavascriptLibrary* library = scriptContext->GetLibrary();
promise->SetStatus(PromiseStatusCode_Unresolved);
promise->reactions = RecyclerNew(recycler, JavascriptPromiseReactionList, recycler);
JavascriptPromiseResolveOrRejectFunctionAlreadyResolvedWrapper* alreadyResolvedRecord = RecyclerNewStructZ(scriptContext->GetRecycler(), JavascriptPromiseResolveOrRejectFunctionAlreadyResolvedWrapper);
alreadyResolvedRecord->alreadyResolved = false;
*resolve = library->CreatePromiseResolveOrRejectFunction(EntryResolveOrRejectFunction, promise, false, alreadyResolvedRecord);
*reject = library->CreatePromiseResolveOrRejectFunction(EntryResolveOrRejectFunction, promise, true, alreadyResolvedRecord);
}
BOOL JavascriptPromise::GetDiagValueString(StringBuilder<ArenaAllocator>* stringBuilder, ScriptContext* requestContext)
{
stringBuilder->AppendCppLiteral(_u("[...]"));
return TRUE;
}
BOOL JavascriptPromise::GetDiagTypeString(StringBuilder<ArenaAllocator>* stringBuilder, ScriptContext* requestContext)
{
stringBuilder->AppendCppLiteral(_u("Promise"));
return TRUE;
}
JavascriptPromiseReactionList* JavascriptPromise::GetReactions()
{
return this->reactions;
}
// Promise.all as described in ES 2015 Section 25.4.4.1
Var JavascriptPromise::EntryAll(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.all"));
// 1. Let C be the this value.
Var constructor = args[0];
// 2. If Type(C) is not Object, throw a TypeError exception.
if (!JavascriptOperators::IsObject(constructor))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedObject, _u("Promise.all"));
}
JavascriptLibrary* library = scriptContext->GetLibrary();
Var iterable;
if (args.Info.Count > 1)
{
iterable = args[1];
}
else
{
iterable = library->GetUndefined();
}
// 3. Let promiseCapability be NewPromiseCapability(C).
JavascriptPromiseCapability* promiseCapability = NewPromiseCapability(constructor, scriptContext);
// We know that constructor is an object at this point - further, we even know that it is a constructor - because NewPromiseCapability
// would throw otherwise. That means we can safely cast constructor into a RecyclableObject* now and avoid having to perform ToObject
// as part of the Invoke operation performed inside the loop below.
RecyclableObject* constructorObject = VarTo<RecyclableObject>(constructor);
uint32 index = 0;
JavascriptArray* values = nullptr;
// We can't use a simple counter for the remaining element count since each Promise.all Resolve Element Function needs to know how many
// elements are remaining when it runs and needs to update that counter for all other functions created by this call to Promise.all.
// We can't just use a static variable, either, since this element count is only used for the Promise.all Resolve Element Functions created
// by this call to Promise.all.
JavascriptPromiseAllResolveElementFunctionRemainingElementsWrapper* remainingElementsWrapper = RecyclerNewStructZ(scriptContext->GetRecycler(), JavascriptPromiseAllResolveElementFunctionRemainingElementsWrapper);
remainingElementsWrapper->remainingElements = 1;
JavascriptExceptionObject* exception = nullptr;
try
{
// 4. Let iterator be GetIterator(iterable).
RecyclableObject* iterator = JavascriptOperators::GetIterator(iterable, scriptContext);
Var resolveVar = JavascriptOperators::GetProperty(constructorObject, Js::PropertyIds::resolve, scriptContext);
if (!JavascriptConversion::IsCallable(resolveVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
RecyclableObject* resolveFunc = VarTo<RecyclableObject>(resolveVar);
values = library->CreateArray(0);
JavascriptOperators::DoIteratorStepAndValue(iterator, scriptContext, [&](Var next)
{
ThreadContext * threadContext = scriptContext->GetThreadContext();
Var nextPromise = nullptr;
BEGIN_SAFE_REENTRANT_CALL(threadContext)
{
nextPromise = CALL_FUNCTION(threadContext,
resolveFunc, Js::CallInfo(CallFlags_Value, 2),
constructorObject,
next);
}
END_SAFE_REENTRANT_CALL
JavascriptPromiseAllResolveElementFunction* resolveElement = library->CreatePromiseAllResolveElementFunction(EntryAllResolveElementFunction, index, values, promiseCapability, remainingElementsWrapper);
remainingElementsWrapper->remainingElements++;
RecyclableObject* nextPromiseObject;
if (!JavascriptConversion::ToObject(nextPromise, scriptContext, &nextPromiseObject))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedObject);
}
Var thenVar = JavascriptOperators::GetProperty(nextPromiseObject, Js::PropertyIds::then, scriptContext);
if (!JavascriptConversion::IsCallable(thenVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
RecyclableObject* thenFunc = VarTo<RecyclableObject>(thenVar);
BEGIN_SAFE_REENTRANT_CALL(threadContext)
{
CALL_FUNCTION(scriptContext->GetThreadContext(),
thenFunc, Js::CallInfo(CallFlags_Value, 3),
nextPromiseObject,
resolveElement,
promiseCapability->GetReject());
}
END_SAFE_REENTRANT_CALL
index++;
});
remainingElementsWrapper->remainingElements--;
if (remainingElementsWrapper->remainingElements == 0)
{
Assert(values != nullptr);
TryCallResolveOrRejectHandler(promiseCapability->GetResolve(), values, scriptContext);
}
}
catch (const JavascriptException& err)
{
exception = err.GetAndClear();
}
if (exception != nullptr)
{
TryRejectWithExceptionObject(exception, promiseCapability->GetReject(), scriptContext);
}
return promiseCapability->GetPromise();
}
Var JavascriptPromise::EntryAny(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.any"));
// 1. Let C be the this value.
Var C = args[0];
// 2. Let promiseCapability be ? NewPromiseCapability(C).
JavascriptPromiseCapability* promiseCapability = NewPromiseCapability(C, scriptContext);
RecyclableObject* constructor = UnsafeVarTo<RecyclableObject>(C);
JavascriptLibrary* library = scriptContext->GetLibrary();
RecyclableObject* promiseResolve = nullptr;
RecyclableObject* iteratorRecord = nullptr;
try {
// 3. Let promiseResolve be GetPromiseResolve(C).
// 4. IfAbruptRejectPromise(promiseResolve, promiseCapability).
Var resolveVar = JavascriptOperators::GetProperty(constructor, Js::PropertyIds::resolve, scriptContext);
if (!JavascriptConversion::IsCallable(resolveVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
promiseResolve = UnsafeVarTo<RecyclableObject>(resolveVar);
// 5. Let iteratorRecord be GetIterator(iterable).
// 6. IfAbruptRejectPromise(iteratorRecord, promiseCapability).
Var iterable = args.Info.Count > 1 ? args[1] : library->GetUndefined();
iteratorRecord = JavascriptOperators::GetIterator(iterable, scriptContext);
}
catch (const JavascriptException& err)
{
JavascriptExceptionObject* exception = err.GetAndClear();
return JavascriptPromise::CreateRejectedPromise(exception->GetThrownObject(scriptContext), scriptContext);
}
// Abstract operation PerformPromiseAny
// 7. Let result be PerformPromiseAny(iteratorRecord, C, promiseCapability, promiseResolve).
try {
// 1. Assert: ! IsConstructor(constructor) is true.
// 2. Assert: resultCapability is a PromiseCapability Record.
// 3. Assert: ! IsCallable(promiseResolve) is true.
// 4. Let errors be a new empty List.
JavascriptArray* errors = library->CreateArray();
// 5. Let remainingElementsCount be a new Record { [[Value]]: 1 }.
JavascriptPromiseAllResolveElementFunctionRemainingElementsWrapper* remainingElementsWrapper = RecyclerNewStructZ(scriptContext->GetRecycler(), JavascriptPromiseAllResolveElementFunctionRemainingElementsWrapper);
remainingElementsWrapper->remainingElements = 1;
// 6. Let index be 0.
uint32 index = 0;
// 7. Repeat,
JavascriptOperators::DoIteratorStepAndValue(iteratorRecord, scriptContext, [&](Var nextValue) {
// a. Let next be IteratorStep(iteratorRecord).
// e. Let nextValue be IteratorValue(next).
// h. Append undefined to errors.
errors->DirectAppendItem(library->GetUndefined());
// i. Let nextPromise be ? Call(promiseResolve, constructor, << nextValue >> ).
ThreadContext* threadContext = scriptContext->GetThreadContext();
Var nextPromise = nullptr;
BEGIN_SAFE_REENTRANT_CALL(threadContext);
{
nextPromise = CALL_FUNCTION(threadContext,
promiseResolve, Js::CallInfo(CallFlags_Value, 2),
constructor,
nextValue);
}
END_SAFE_REENTRANT_CALL;
JavascriptPromiseResolveOrRejectFunctionAlreadyResolvedWrapper* alreadyCalledWrapper = RecyclerNewStructZ(scriptContext->GetRecycler(), JavascriptPromiseResolveOrRejectFunctionAlreadyResolvedWrapper);
alreadyCalledWrapper->alreadyResolved = false;
// j. Let steps be the algorithm steps defined in Promise.any Reject Element Functions.
// k. Let rejectElement be ! CreateBuiltinFunction(steps, << [[AlreadyCalled]], [[Index]], [[Errors]], [[Capability]], [[RemainingElements]] >> ).
// p. Set rejectElement.[[RemainingElements]] to remainingElementsCount.
Var rejectElement = library->CreatePromiseAnyRejectElementFunction(EntryAnyRejectElementFunction, index, errors, promiseCapability, remainingElementsWrapper, alreadyCalledWrapper);
// q. Set remainingElementsCount.[[Value]] to remainingElementsCount.[[Value]] + 1.
remainingElementsWrapper->remainingElements++;
// r. Perform ? Invoke(nextPromise, "then", << resultCapability.[[Resolve]], rejectElement >> ).
RecyclableObject* nextPromiseObject;
if (!JavascriptConversion::ToObject(nextPromise, scriptContext, &nextPromiseObject))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedObject);
}
Var thenVar = JavascriptOperators::GetProperty(nextPromiseObject, Js::PropertyIds::then, scriptContext);
if (!JavascriptConversion::IsCallable(thenVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
RecyclableObject* thenFunc = UnsafeVarTo<RecyclableObject>(thenVar);
BEGIN_SAFE_REENTRANT_CALL(threadContext)
{
CALL_FUNCTION(scriptContext->GetThreadContext(),
thenFunc, Js::CallInfo(CallFlags_Value, 3),
nextPromiseObject,
promiseCapability->GetResolve(),
rejectElement);
}
END_SAFE_REENTRANT_CALL;
// s.Increase index by 1.
index++;
});
// 7.d. If next is false, then
// 7.d.i. Set iteratorRecord.[[Done]] to true.
// 7.d.ii. Set remainingElementsCount.[[Value]] to remainingElementsCount.[[Value]] - 1.
remainingElementsWrapper->remainingElements--;
// 7.d.iii. If remainingElementsCount.[[Value]] is 0, then
if (remainingElementsWrapper->remainingElements == 0)
{
// 7.d.iii.1 Let error be a newly created AggregateError object.
JavascriptError* pError = library->CreateAggregateError();
JavascriptError::SetErrorsList(pError, errors, scriptContext);
JavascriptError::SetErrorMessage(pError, JSERR_PromiseAllRejected, _u(""), scriptContext);
JavascriptExceptionOperators::Throw(pError, scriptContext);
}
}
catch (const JavascriptException& err)
{
// 8. If result is an abrupt completion, then
// a. If iteratorRecord.[[Done]] is false, set result to IteratorClose(iteratorRecord, result).
// b. IfAbruptRejectPromise(result, promiseCapability).
JavascriptExceptionObject* exception = err.GetAndClear();
TryRejectWithExceptionObject(exception, promiseCapability->GetReject(), scriptContext);
}
return promiseCapability->GetPromise();
}
Var JavascriptPromise::EntryAnyRejectElementFunction(RecyclableObject* function, CallInfo callInfo, ...)
{
ScriptContext* scriptContext = function->GetScriptContext();
PROBE_STACK(scriptContext, Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
JavascriptLibrary* library = scriptContext->GetLibrary();
Var undefinedVar = library ->GetUndefined();
Var x = args.Info.Count > 1 ? args[1] : undefinedVar;
// 1. Let F be the active function object.
JavascriptPromiseAnyRejectElementFunction* anyRejectElementFunction = VarTo<JavascriptPromiseAnyRejectElementFunction>(function);
// 2. Let alreadyCalled be F. [[AlreadyCalled]].
// 3. If alreadyCalled. [[Value]] is true, return undefined.
if (anyRejectElementFunction->IsAlreadyCalled())
{
return undefinedVar;
}
// 4. Set alreadyCalled.[[Value]] to true.
anyRejectElementFunction->SetAlreadyCalled(true);
// 5. Let index be F.[[Index]].
uint32 index = anyRejectElementFunction->GetIndex();
// 6. Let errors be F.[[Errors]].
JavascriptArray* errors = anyRejectElementFunction->GetValues();
// 7. Let promiseCapability be F.[[Capability]].
JavascriptPromiseCapability* promiseCapability = anyRejectElementFunction->GetCapabilities();
// 9. Set errors[index] to x.
errors->DirectSetItemAt(index, x);
// 8. Let remainingElementsCount be F.[[RemainingElements]].
// 10. Set remainingElementsCount.[[Value]] to remainingElementsCount.[[Value]] - 1.
// 11. If remainingElementsCount.[[Value]] is 0, then
if (anyRejectElementFunction->DecrementRemainingElements() == 0)
{
// a. Let error be a newly created AggregateError object.
JavascriptError* pError = library->CreateAggregateError();
// b. Perform ! DefinePropertyOrThrow(error, "errors", Property Descriptor { [[Configurable]]: true, [[Enumerable]]: false, [[Writable]]: true, [[Value]]: ! CreateArrayFromList(errors) }).
JavascriptError::SetErrorsList(pError, errors, scriptContext);
JavascriptError::SetErrorMessage(pError, JSERR_PromiseAllRejected, _u(""), scriptContext);
// c. Return ? Call(promiseCapability.[[Reject]], undefined, << error >> ).
return TryCallResolveOrRejectHandler(promiseCapability->GetReject(), pError, scriptContext);
}
return undefinedVar;
}
Var JavascriptPromise::EntryAllSettled(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.allSettled"));
// 1. Let C be the this value.
Var constructor = args[0];
// 2. If Type(C) is not Object, throw a TypeError exception.
if (!JavascriptOperators::IsObject(constructor))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedObject, _u("Promise.allSettled"));
}
JavascriptLibrary* library = scriptContext->GetLibrary();
Var iterable;
if (args.Info.Count > 1)
{
iterable = args[1];
}
else
{
iterable = library->GetUndefined();
}
// 3. Let promiseCapability be NewPromiseCapability(C).
JavascriptPromiseCapability* promiseCapability = NewPromiseCapability(constructor, scriptContext);
// We know that constructor is an object at this point - further, we even know that it is a constructor - because NewPromiseCapability
// would throw otherwise. That means we can safely cast constructor into a RecyclableObject* now and avoid having to perform ToObject
// as part of the Invoke operation performed inside the loop below.
RecyclableObject* constructorObject = VarTo<RecyclableObject>(constructor);
uint32 index = 0;
JavascriptArray* values = nullptr;
// We can't use a simple counter for the remaining element count since each Promise.all Resolve Element Function needs to know how many
// elements are remaining when it runs and needs to update that counter for all other functions created by this call to Promise.all.
// We can't just use a static variable, either, since this element count is only used for the Promise.all Resolve Element Functions created
// by this call to Promise.all.
JavascriptPromiseAllResolveElementFunctionRemainingElementsWrapper* remainingElementsWrapper = RecyclerNewStructZ(scriptContext->GetRecycler(), JavascriptPromiseAllResolveElementFunctionRemainingElementsWrapper);
remainingElementsWrapper->remainingElements = 1;
JavascriptExceptionObject* exception = nullptr;
try
{
// 4. Let iterator be GetIterator(iterable).
RecyclableObject* iterator = JavascriptOperators::GetIterator(iterable, scriptContext);
// Abstract operation PerformPromiseAllSettled
Var resolveVar = JavascriptOperators::GetProperty(constructorObject, Js::PropertyIds::resolve, scriptContext);
if (!JavascriptConversion::IsCallable(resolveVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
RecyclableObject* resolveFunc = VarTo<RecyclableObject>(resolveVar);
values = library->CreateArray(0);
JavascriptOperators::DoIteratorStepAndValue(iterator, scriptContext, [&](Var next)
{
ThreadContext* threadContext = scriptContext->GetThreadContext();
Var nextPromise = nullptr;
BEGIN_SAFE_REENTRANT_CALL(threadContext)
{
nextPromise = CALL_FUNCTION(threadContext,
resolveFunc, Js::CallInfo(CallFlags_Value, 2),
constructorObject,
next);
}
END_SAFE_REENTRANT_CALL
JavascriptPromiseResolveOrRejectFunctionAlreadyResolvedWrapper* alreadyCalledWrapper = RecyclerNewStructZ(scriptContext->GetRecycler(), JavascriptPromiseResolveOrRejectFunctionAlreadyResolvedWrapper);
alreadyCalledWrapper->alreadyResolved = false;
Var resolveElement = library->CreatePromiseAllSettledResolveOrRejectElementFunction(EntryAllSettledResolveOrRejectElementFunction, index, values, promiseCapability, remainingElementsWrapper, alreadyCalledWrapper, false);
Var rejectElement = library->CreatePromiseAllSettledResolveOrRejectElementFunction(EntryAllSettledResolveOrRejectElementFunction, index, values, promiseCapability, remainingElementsWrapper, alreadyCalledWrapper, true);
remainingElementsWrapper->remainingElements++;
RecyclableObject* nextPromiseObject;
if (!JavascriptConversion::ToObject(nextPromise, scriptContext, &nextPromiseObject))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedObject);
}
Var thenVar = JavascriptOperators::GetProperty(nextPromiseObject, Js::PropertyIds::then, scriptContext);
if (!JavascriptConversion::IsCallable(thenVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
RecyclableObject* thenFunc = VarTo<RecyclableObject>(thenVar);
BEGIN_SAFE_REENTRANT_CALL(threadContext)
{
CALL_FUNCTION(scriptContext->GetThreadContext(),
thenFunc, Js::CallInfo(CallFlags_Value, 3),
nextPromiseObject,
resolveElement,
rejectElement);
}
END_SAFE_REENTRANT_CALL
index++;
});
remainingElementsWrapper->remainingElements--;
if (remainingElementsWrapper->remainingElements == 0)
{
Assert(values != nullptr);
TryCallResolveOrRejectHandler(promiseCapability->GetResolve(), values, scriptContext);
}
}
catch (const JavascriptException& err)
{
exception = err.GetAndClear();
}
if (exception != nullptr)
{
TryRejectWithExceptionObject(exception, promiseCapability->GetReject(), scriptContext);
}
return promiseCapability->GetPromise();
}
// Promise.prototype.catch as defined in ES 2015 Section 25.4.5.1
Var JavascriptPromise::EntryCatch(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.prototype.catch"));
RecyclableObject* promise;
if (!JavascriptConversion::ToObject(args[0], scriptContext, &promise))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedObject, _u("Promise.prototype.catch"));
}
Var funcVar = JavascriptOperators::GetProperty(promise, Js::PropertyIds::then, scriptContext);
if (!JavascriptConversion::IsCallable(funcVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_FunctionArgument_NeedFunction, _u("Promise.prototype.catch"));
}
Var onRejected;
RecyclableObject* undefinedVar = scriptContext->GetLibrary()->GetUndefined();
if (args.Info.Count > 1)
{
onRejected = args[1];
}
else
{
onRejected = undefinedVar;
}
RecyclableObject* func = VarTo<RecyclableObject>(funcVar);
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
return CALL_FUNCTION(scriptContext->GetThreadContext(),
func, Js::CallInfo(CallFlags_Value, 3),
promise,
undefinedVar,
onRejected);
}
END_SAFE_REENTRANT_CALL
}
// Promise.race as described in ES 2015 Section 25.4.4.3
Var JavascriptPromise::EntryRace(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.race"));
// 1. Let C be the this value.
Var constructor = args[0];
// 2. If Type(C) is not Object, throw a TypeError exception.
if (!JavascriptOperators::IsObject(constructor))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedObject, _u("Promise.race"));
}
Var undefinedVar = scriptContext->GetLibrary()->GetUndefined();
Var iterable;
if (args.Info.Count > 1)
{
iterable = args[1];
}
else
{
iterable = undefinedVar;
}
// 3. Let promiseCapability be NewPromiseCapability(C).
JavascriptPromiseCapability* promiseCapability = NewPromiseCapability(constructor, scriptContext);
// We know that constructor is an object at this point - further, we even know that it is a constructor - because NewPromiseCapability
// would throw otherwise. That means we can safely cast constructor into a RecyclableObject* now and avoid having to perform ToObject
// as part of the Invoke operation performed inside the loop below.
RecyclableObject* constructorObject = VarTo<RecyclableObject>(constructor);
JavascriptExceptionObject* exception = nullptr;
try
{
// 4. Let iterator be GetIterator(iterable).
RecyclableObject* iterator = JavascriptOperators::GetIterator(iterable, scriptContext);
Var resolveVar = JavascriptOperators::GetProperty(constructorObject, Js::PropertyIds::resolve, scriptContext);
if (!JavascriptConversion::IsCallable(resolveVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
RecyclableObject* resolveFunc = VarTo<RecyclableObject>(resolveVar);
JavascriptOperators::DoIteratorStepAndValue(iterator, scriptContext, [&](Var next)
{
ThreadContext * threadContext = scriptContext->GetThreadContext();
Var nextPromise = nullptr;
BEGIN_SAFE_REENTRANT_CALL(threadContext)
{
nextPromise = CALL_FUNCTION(threadContext,
resolveFunc, Js::CallInfo(CallFlags_Value, 2),
constructorObject,
next);
}
END_SAFE_REENTRANT_CALL
RecyclableObject* nextPromiseObject;
if (!JavascriptConversion::ToObject(nextPromise, scriptContext, &nextPromiseObject))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedObject);
}
Var thenVar = JavascriptOperators::GetProperty(nextPromiseObject, Js::PropertyIds::then, scriptContext);
if (!JavascriptConversion::IsCallable(thenVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_NeedFunction);
}
RecyclableObject* thenFunc = VarTo<RecyclableObject>(thenVar);
BEGIN_SAFE_REENTRANT_CALL(threadContext)
{
CALL_FUNCTION(threadContext,
thenFunc, Js::CallInfo(CallFlags_Value, 3),
nextPromiseObject,
promiseCapability->GetResolve(),
promiseCapability->GetReject());
}
END_SAFE_REENTRANT_CALL
});
}
catch (const JavascriptException& err)
{
exception = err.GetAndClear();
}
if (exception != nullptr)
{
TryRejectWithExceptionObject(exception, promiseCapability->GetReject(), scriptContext);
}
return promiseCapability->GetPromise();
}
// Promise.reject as described in ES 2015 Section 25.4.4.4
Var JavascriptPromise::EntryReject(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.reject"));
// 1. Let C be the this value.
Var constructor = args[0];
// 2. If Type(C) is not Object, throw a TypeError exception.
if (!JavascriptOperators::IsObject(constructor))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedObject, _u("Promise.reject"));
}
Var r;
if (args.Info.Count > 1)
{
r = args[1];
}
else
{
r = scriptContext->GetLibrary()->GetUndefined();
}
// 3. Let promiseCapability be NewPromiseCapability(C).
// 4. Perform ? Call(promiseCapability.[[Reject]], undefined, << r >>).
// 5. Return promiseCapability.[[Promise]].
return CreateRejectedPromise(r, scriptContext, constructor);
}
// Promise.resolve as described in ES 2015 Section 25.4.4.5
Var JavascriptPromise::EntryResolve(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.resolve"));
Var x;
// 1. Let C be the this value.
Var constructor = args[0];
// 2. If Type(C) is not Object, throw a TypeError exception.
if (!JavascriptOperators::IsObject(constructor))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedObject, _u("Promise.resolve"));
}
if (args.Info.Count > 1)
{
x = args[1];
}
else
{
x = scriptContext->GetLibrary()->GetUndefined();
}
return PromiseResolve(constructor, x, scriptContext);
}
JavascriptPromise* JavascriptPromise::InternalPromiseResolve(Var value, ScriptContext* scriptContext)
{
Var constructor = scriptContext->GetLibrary()->GetPromiseConstructor();
Var promise = PromiseResolve(constructor, value, scriptContext);
return UnsafeVarTo<JavascriptPromise>(promise);
}
Var JavascriptPromise::PromiseResolve(Var constructor, Var value, ScriptContext* scriptContext)
{
if (VarIs<JavascriptPromise>(value))
{
Var valueConstructor = JavascriptOperators::GetProperty(
(RecyclableObject*)value,
PropertyIds::constructor,
scriptContext);
// If `value` is a Promise or Promise subclass instance and its "constructor"
// property is `constructor`, then return the value unchanged
if (JavascriptConversion::SameValue(valueConstructor, constructor))
{
return value;
}
}
return CreateResolvedPromise(value, scriptContext, constructor);
}
// Promise.prototype.then as described in ES 2015 Section 25.4.5.3
Var JavascriptPromise::EntryThen(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.prototype.then"));
if (args.Info.Count < 1 || !VarIs<JavascriptPromise>(args[0]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedPromise, _u("Promise.prototype.then"));
}
JavascriptLibrary* library = scriptContext->GetLibrary();
JavascriptPromise* promise = VarTo<JavascriptPromise>(args[0]);
RecyclableObject* rejectionHandler;
RecyclableObject* fulfillmentHandler;
if (args.Info.Count > 1 && JavascriptConversion::IsCallable(args[1]))
{
fulfillmentHandler = VarTo<RecyclableObject>(args[1]);
}
else
{
fulfillmentHandler = library->GetIdentityFunction();
}
if (args.Info.Count > 2 && JavascriptConversion::IsCallable(args[2]))
{
rejectionHandler = VarTo<RecyclableObject>(args[2]);
}
else
{
rejectionHandler = library->GetThrowerFunction();
}
return CreateThenPromise(promise, fulfillmentHandler, rejectionHandler, scriptContext);
}
// Promise.prototype.finally as described in the draft ES 2018 #sec-promise.prototype.finally
Var JavascriptPromise::EntryFinally(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
AUTO_TAG_NATIVE_LIBRARY_ENTRY(function, callInfo, _u("Promise.prototype.finally"));
// 1. Let promise be the this value
// 2. If Type(promise) is not Object, throw a TypeError exception
if (args.Info.Count < 1 || !JavascriptOperators::IsObject(args[0]))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_This_NeedObject, _u("Promise.prototype.finally"));
}
JavascriptLibrary* library = scriptContext->GetLibrary();
RecyclableObject* promise = UnsafeVarTo<RecyclableObject>(args[0]);
// 3. Let C be ? SpeciesConstructor(promise, %Promise%).
RecyclableObject* constructor = JavascriptOperators::SpeciesConstructor(promise, scriptContext->GetLibrary()->GetPromiseConstructor(), scriptContext);
// 4. Assert IsConstructor(C)
Assert(JavascriptOperators::IsConstructor(constructor));
// 5. If IsCallable(onFinally) is false
// a. Let thenFinally be onFinally
// b. Let catchFinally be onFinally
// 6. Else,
// a. Let thenFinally be a new built-in function object as defined in ThenFinally Function.
// b. Let catchFinally be a new built-in function object as defined in CatchFinally Function.
// c. Set thenFinally and catchFinally's [[Constructor]] internal slots to C.
// d. Set thenFinally and catchFinally's [[OnFinally]] internal slots to onFinally.
Var thenFinally = nullptr;
Var catchFinally = nullptr;
if (args.Info.Count > 1)
{
if (JavascriptConversion::IsCallable(args[1]))
{
//note to avoid duplicating code the ThenFinallyFunction works as both thenFinally and catchFinally using a flag
thenFinally = library->CreatePromiseThenFinallyFunction(EntryThenFinallyFunction, VarTo<RecyclableObject>(args[1]), constructor, false);
catchFinally = library->CreatePromiseThenFinallyFunction(EntryThenFinallyFunction, VarTo<RecyclableObject>(args[1]), constructor, true);
}
else
{
thenFinally = args[1];
catchFinally = args[1];
}
}
else
{
thenFinally = library->GetUndefined();
catchFinally = library->GetUndefined();
}
Assert(thenFinally != nullptr && catchFinally != nullptr);
// 7. Return ? Invoke(promise, "then", << thenFinally, catchFinally >>).
Var funcVar = JavascriptOperators::GetProperty(promise, Js::PropertyIds::then, scriptContext);
if (!JavascriptConversion::IsCallable(funcVar))
{
JavascriptError::ThrowTypeError(scriptContext, JSERR_FunctionArgument_NeedFunction, _u("Promise.prototype.finally"));
}
RecyclableObject* func = UnsafeVarTo<RecyclableObject>(funcVar);
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{
return CALL_FUNCTION(scriptContext->GetThreadContext(),
func, Js::CallInfo(CallFlags_Value, 3),
promise,
thenFinally,
catchFinally);
}
END_SAFE_REENTRANT_CALL
}
// ThenFinallyFunction as described in draft ES2018 #sec-thenfinallyfunctions
// AND CatchFinallyFunction as described in draft ES2018 #sec-catchfinallyfunctions
Var JavascriptPromise::EntryThenFinallyFunction(RecyclableObject* function, CallInfo callInfo, ...)
{
PROBE_STACK(function->GetScriptContext(), Js::Constants::MinStackDefault);
ARGUMENTS(args, callInfo);
Assert(!(callInfo.Flags & CallFlags_New));
ScriptContext* scriptContext = function->GetScriptContext();
JavascriptLibrary* library = scriptContext->GetLibrary();
JavascriptPromiseThenFinallyFunction* thenFinallyFunction = VarTo<JavascriptPromiseThenFinallyFunction>(function);
// 1. Let onFinally be F.[[OnFinally]]
// 2. Assert: IsCallable(onFinally)=true
Assert(JavascriptConversion::IsCallable(thenFinallyFunction->GetOnFinally()));
// 3. Let result be ? Call(onFinally, undefined)
Var result = nullptr;
BEGIN_SAFE_REENTRANT_CALL(scriptContext->GetThreadContext())
{