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LibJS: Annotate Promise implementation with spec comments
I wanted to do this for a long time. The guts of Promise are pretty complex, and it's easier to understand with the spec right next to it. Also found a couple of issues along the way :^)
This commit is contained in:
parent
df06552b48
commit
01c2570678
7 changed files with 523 additions and 41 deletions
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@ -27,10 +27,14 @@ static ThrowCompletionOr<Value> get_promise_resolve(GlobalObject& global_object,
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VERIFY(constructor.is_constructor());
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auto& vm = global_object.vm();
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// 1. Let promiseResolve be ? Get(promiseConstructor, "resolve").
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auto promise_resolve = TRY(constructor.get(global_object, vm.names.resolve));
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// 2. If IsCallable(promiseResolve) is false, throw a TypeError exception.
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if (!promise_resolve.is_function())
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return vm.throw_completion<TypeError>(global_object, ErrorType::NotAFunction, promise_resolve.to_string_without_side_effects());
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// 3. Return promiseResolve.
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return promise_resolve;
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}
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@ -38,13 +42,19 @@ static ThrowCompletionOr<Value> get_promise_resolve(GlobalObject& global_object,
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#define TRY_OR_REJECT(vm, capability, expression) \
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({ \
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auto _temporary_result = (expression); \
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/* 1. If value is an abrupt completion, then */ \
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if (_temporary_result.is_error()) { \
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vm.clear_exception(); \
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vm.stop_unwind(); \
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\
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/* a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »). */ \
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(void)vm.call(*capability.reject, js_undefined(), _temporary_result.release_error().value()); \
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\
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/* b. Return capability.[[Promise]]. */ \
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return capability.promise; \
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} \
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\
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/* 2. Else if value is a Completion Record, set value to value.[[Value]]. */ \
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_temporary_result.release_value(); \
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})
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@ -78,40 +88,70 @@ static ThrowCompletionOr<Value> perform_promise_common(GlobalObject& global_obje
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VERIFY(constructor.is_constructor());
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VERIFY(promise_resolve.is_function());
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// 1. Let values be a new empty List.
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auto* values = vm.heap().allocate_without_global_object<PromiseValueList>();
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// 2. Let remainingElementsCount be the Record { [[Value]]: 1 }.
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auto* remaining_elements_count = vm.heap().allocate_without_global_object<RemainingElements>(1);
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// 3. Let index be 0.
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size_t index = 0;
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// 4. Repeat,
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while (true) {
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// a. Let next be IteratorStep(iteratorRecord).
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auto next_or_error = iterator_step(global_object, iterator_record);
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// b. If next is an abrupt completion, set iteratorRecord.[[Done]] to true.
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// c. ReturnIfAbrupt(next).
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if (next_or_error.is_throw_completion()) {
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set_iterator_record_complete(global_object, iterator_record);
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return next_or_error.release_error();
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}
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auto* next = next_or_error.release_value();
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// d. If next is false, then
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if (!next) {
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// i. Set iteratorRecord.[[Done]] to true.
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set_iterator_record_complete(global_object, iterator_record);
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if (--remaining_elements_count->value == 0)
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// ii. Set remainingElementsCount.[[Value]] to remainingElementsCount.[[Value]] - 1.
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// iii. If remainingElementsCount.[[Value]] is 0, then
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if (--remaining_elements_count->value == 0) {
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// 1-2/3. are handled in `end_of_list`
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return TRY(end_of_list(*values));
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}
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// iv. Return resultCapability.[[Promise]].
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return result_capability.promise;
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}
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// e. Let nextValue be IteratorValue(next).
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auto next_value_or_error = iterator_value(global_object, *next);
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// f. If nextValue is an abrupt completion, set iteratorRecord.[[Done]] to true.
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// g. ReturnIfAbrupt(nextValue).
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if (next_value_or_error.is_throw_completion()) {
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set_iterator_record_complete(global_object, iterator_record);
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return next_value_or_error.release_error();
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}
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auto next_value = next_value_or_error.release_value();
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// h. Append undefined to values.
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values->values().append(js_undefined());
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// i. Let nextPromise be ? Call(promiseResolve, constructor, « nextValue »).
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auto next_promise = TRY(vm.call(promise_resolve.as_function(), constructor, next_value));
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// j-q. are handled in `invoke_element_function`
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// r. Set remainingElementsCount.[[Value]] to remainingElementsCount.[[Value]] + 1.
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++remaining_elements_count->value;
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// s. Perform ? Invoke(nextPromise, "then", « ... »).
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TRY(invoke_element_function(*values, *remaining_elements_count, next_promise, index));
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// t. Set index to index + 1.
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++index;
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}
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}
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@ -124,16 +164,28 @@ static ThrowCompletionOr<Value> perform_promise_all(GlobalObject& global_object,
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return perform_promise_common(
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global_object, iterator_record, constructor, result_capability, promise_resolve,
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[&](PromiseValueList& values) -> ThrowCompletionOr<Value> {
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// 1. Let valuesArray be ! CreateArrayFromList(values).
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auto values_array = Array::create_from(global_object, values.values());
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// 2. Perform ? Call(resultCapability.[[Resolve]], undefined, « valuesArray »).
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TRY(vm.call(*result_capability.resolve, js_undefined(), values_array));
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// iv. Return resultCapability.[[Promise]].
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return Value(result_capability.promise);
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},
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[&](PromiseValueList& values, RemainingElements& remaining_elements_count, Value next_promise, size_t index) {
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// j. Let steps be the algorithm steps defined in Promise.all Resolve Element Functions.
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// k. Let length be the number of non-optional parameters of the function definition in Promise.all Resolve Element Functions.
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// l. Let onFulfilled be ! CreateBuiltinFunction(steps, length, "", « [[AlreadyCalled]], [[Index]], [[Values]], [[Capability]], [[RemainingElements]] »).
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// m. Set onFulfilled.[[AlreadyCalled]] to false.
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// n. Set onFulfilled.[[Index]] to index.
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// o. Set onFulfilled.[[Values]] to values.
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// p. Set onFulfilled.[[Capability]] to resultCapability.
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// q. Set onFulfilled.[[RemainingElements]] to remainingElementsCount.
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auto* on_fulfilled = PromiseAllResolveElementFunction::create(global_object, index, values, result_capability, remaining_elements_count);
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on_fulfilled->define_direct_property(vm.names.name, js_string(vm, String::empty()), Attribute::Configurable);
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// s. Perform ? Invoke(nextPromise, "then", « onFulfilled, resultCapability.[[Reject]] »).
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return next_promise.invoke(global_object, vm.names.then, on_fulfilled, result_capability.reject);
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});
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}
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@ -153,12 +205,30 @@ static ThrowCompletionOr<Value> perform_promise_all_settled(GlobalObject& global
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return Value(result_capability.promise);
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},
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[&](PromiseValueList& values, RemainingElements& remaining_elements_count, Value next_promise, size_t index) {
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// j. Let stepsFulfilled be the algorithm steps defined in Promise.allSettled Resolve Element Functions.
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// k. Let lengthFulfilled be the number of non-optional parameters of the function definition in Promise.allSettled Resolve Element Functions.
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// l. Let onFulfilled be ! CreateBuiltinFunction(stepsFulfilled, lengthFulfilled, "", « [[AlreadyCalled]], [[Index]], [[Values]], [[Capability]], [[RemainingElements]] »).
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// m. Let alreadyCalled be the Record { [[Value]]: false }.
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// n. Set onFulfilled.[[AlreadyCalled]] to alreadyCalled.
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// o. Set onFulfilled.[[Index]] to index.
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// p. Set onFulfilled.[[Values]] to values.
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// q. Set onFulfilled.[[Capability]] to resultCapability.
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// r. Set onFulfilled.[[RemainingElements]] to remainingElementsCount.
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auto* on_fulfilled = PromiseAllSettledResolveElementFunction::create(global_object, index, values, result_capability, remaining_elements_count);
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on_fulfilled->define_direct_property(vm.names.name, js_string(vm, String::empty()), Attribute::Configurable);
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// s. Let stepsRejected be the algorithm steps defined in Promise.allSettled Reject Element Functions.
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// t. Let lengthRejected be the number of non-optional parameters of the function definition in Promise.allSettled Reject Element Functions.
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// u. Let onRejected be ! CreateBuiltinFunction(stepsRejected, lengthRejected, "", « [[AlreadyCalled]], [[Index]], [[Values]], [[Capability]], [[RemainingElements]] »).
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// v. Set onRejected.[[AlreadyCalled]] to alreadyCalled.
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// w. Set onRejected.[[Index]] to index.
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// x. Set onRejected.[[Values]] to values.
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// y. Set onRejected.[[Capability]] to resultCapability.
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// z. Set onRejected.[[RemainingElements]] to remainingElementsCount.
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auto* on_rejected = PromiseAllSettledRejectElementFunction::create(global_object, index, values, result_capability, remaining_elements_count);
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on_rejected->define_direct_property(vm.names.name, js_string(vm, String::empty()), Attribute::Configurable);
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// ab. Perform ? Invoke(nextPromise, "then", « onFulfilled, onRejected »).
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return next_promise.invoke(global_object, vm.names.then, on_fulfilled, on_rejected);
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});
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}
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@ -171,18 +241,30 @@ static ThrowCompletionOr<Value> perform_promise_any(GlobalObject& global_object,
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return perform_promise_common(
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global_object, iterator_record, constructor, result_capability, promise_resolve,
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[&](PromiseValueList& errors) -> ThrowCompletionOr<Value> {
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auto errors_array = Array::create_from(global_object, errors.values());
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// 1. Let error be a newly created AggregateError object.
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auto* error = AggregateError::create(global_object);
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// 2. Perform ! DefinePropertyOrThrow(error, "errors", PropertyDescriptor { [[Configurable]]: true, [[Enumerable]]: false, [[Writable]]: true, [[Value]]: ! CreateArrayFromList(errors) }).
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auto* errors_array = Array::create_from(global_object, errors.values());
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MUST(error->define_property_or_throw(vm.names.errors, { .value = errors_array, .writable = true, .enumerable = false, .configurable = true }));
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// 3. Return ThrowCompletion(error).
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vm.throw_exception(global_object, error);
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return throw_completion(error);
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},
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[&](PromiseValueList& errors, RemainingElements& remaining_elements_count, Value next_promise, size_t index) {
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// j. Let stepsRejected be the algorithm steps defined in Promise.any Reject Element Functions.
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// k. Let lengthRejected be the number of non-optional parameters of the function definition in Promise.any Reject Element Functions.
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// l. Let onRejected be ! CreateBuiltinFunction(stepsRejected, lengthRejected, "", « [[AlreadyCalled]], [[Index]], [[Errors]], [[Capability]], [[RemainingElements]] »).
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// m. Set onRejected.[[AlreadyCalled]] to false.
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// n. Set onRejected.[[Index]] to index.
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// o. Set onRejected.[[Errors]] to errors.
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// p. Set onRejected.[[Capability]] to resultCapability.
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// q. Set onRejected.[[RemainingElements]] to remainingElementsCount.
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auto* on_rejected = PromiseAnyRejectElementFunction::create(global_object, index, errors, result_capability, remaining_elements_count);
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on_rejected->define_direct_property(vm.names.name, js_string(vm, String::empty()), Attribute::Configurable);
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// s. Perform ? Invoke(nextPromise, "then", « resultCapability.[[Resolve]], onRejected »).
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return next_promise.invoke(global_object, vm.names.then, result_capability.resolve, on_rejected);
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});
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}
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@ -195,9 +277,11 @@ static ThrowCompletionOr<Value> perform_promise_race(GlobalObject& global_object
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return perform_promise_common(
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global_object, iterator_record, constructor, result_capability, promise_resolve,
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[&](PromiseValueList&) -> ThrowCompletionOr<Value> {
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// ii. Return resultCapability.[[Promise]].
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return Value(result_capability.promise);
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},
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[&](PromiseValueList&, RemainingElements&, Value next_promise, size_t) {
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// i. Perform ? Invoke(nextPromise, "then", « resultCapability.[[Resolve]], resultCapability.[[Reject]] »).
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return next_promise.invoke(global_object, vm.names.then, result_capability.resolve, result_capability.reject);
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});
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}
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@ -232,6 +316,8 @@ void PromiseConstructor::initialize(GlobalObject& global_object)
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ThrowCompletionOr<Value> PromiseConstructor::call()
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{
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auto& vm = this->vm();
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// 1. If NewTarget is undefined, throw a TypeError exception.
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return vm.throw_completion<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.Promise);
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}
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@ -242,127 +328,209 @@ ThrowCompletionOr<Object*> PromiseConstructor::construct(FunctionObject& new_tar
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auto& global_object = this->global_object();
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auto executor = vm.argument(0);
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// 2. If IsCallable(executor) is false, throw a TypeError exception.
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if (!executor.is_function())
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return vm.throw_completion<TypeError>(global_object, ErrorType::PromiseExecutorNotAFunction);
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// 3. Let promise be ? OrdinaryCreateFromConstructor(NewTarget, "%Promise.prototype%", « [[PromiseState]], [[PromiseResult]], [[PromiseFulfillReactions]], [[PromiseRejectReactions]], [[PromiseIsHandled]] »).
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// 4. Set promise.[[PromiseState]] to pending.
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// 5. Set promise.[[PromiseFulfillReactions]] to a new empty List.
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// 6. Set promise.[[PromiseRejectReactions]] to a new empty List.
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// 7. Set promise.[[PromiseIsHandled]] to false.
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auto* promise = TRY(ordinary_create_from_constructor<Promise>(global_object, new_target, &GlobalObject::promise_prototype));
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// 8. Let resolvingFunctions be CreateResolvingFunctions(promise).
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auto [resolve_function, reject_function] = promise->create_resolving_functions();
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// 9. Let completion be Call(executor, undefined, « resolvingFunctions.[[Resolve]], resolvingFunctions.[[Reject]] »).
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(void)vm.call(executor.as_function(), js_undefined(), &resolve_function, &reject_function);
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// 10. If completion is an abrupt completion, then
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if (auto* exception = vm.exception()) {
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vm.clear_exception();
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vm.stop_unwind();
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// a. Perform ? Call(resolvingFunctions.[[Reject]], undefined, « completion.[[Value]] »).
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TRY(vm.call(reject_function, js_undefined(), exception->value()));
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}
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// 11. Return promise.
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return promise;
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}
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// 27.2.4.1 Promise.all ( iterable ), https://tc39.es/ecma262/#sec-promise.all
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JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::all)
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{
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// 1. Let C be the this value.
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auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
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// 2. Let promiseCapability be ? NewPromiseCapability(C).
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auto promise_capability = TRY(new_promise_capability(global_object, constructor));
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// 3. Let promiseResolve be GetPromiseResolve(C).
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// 4. IfAbruptRejectPromise(promiseResolve, promiseCapability).
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auto promise_resolve = TRY_OR_REJECT(vm, promise_capability, get_promise_resolve(global_object, constructor));
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// 5. Let iteratorRecord be GetIterator(iterable).
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// 6. IfAbruptRejectPromise(iteratorRecord, promiseCapability).
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auto* iterator_record = TRY_OR_REJECT(vm, promise_capability, get_iterator(global_object, vm.argument(0)));
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// 7. Let result be PerformPromiseAll(iteratorRecord, C, promiseCapability, promiseResolve).
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auto result = perform_promise_all(global_object, *iterator_record, constructor, promise_capability, promise_resolve);
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// 8. If result is an abrupt completion, then
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if (result.is_error()) {
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// a. If iteratorRecord.[[Done]] is false, set result to IteratorClose(iteratorRecord, result).
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if (!iterator_record_is_complete(global_object, *iterator_record))
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result = iterator_close(*iterator_record, result.release_error());
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// b. IfAbruptRejectPromise(result, promiseCapability).
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TRY_OR_REJECT(vm, promise_capability, result);
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}
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// 9. Return Completion(result).
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return result.release_value();
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}
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// 27.2.4.2 Promise.allSettled ( iterable ), https://tc39.es/ecma262/#sec-promise.allsettled
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JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::all_settled)
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{
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// 1. Let C be the this value.
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auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
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// 2. Let promiseCapability be ? NewPromiseCapability(C).
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auto promise_capability = TRY(new_promise_capability(global_object, constructor));
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// 3. Let promiseResolve be GetPromiseResolve(C).
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// 4. IfAbruptRejectPromise(promiseResolve, promiseCapability).
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auto promise_resolve = TRY_OR_REJECT(vm, promise_capability, get_promise_resolve(global_object, constructor));
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// 5. Let iteratorRecord be GetIterator(iterable).
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// 6. IfAbruptRejectPromise(iteratorRecord, promiseCapability).
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auto* iterator_record = TRY_OR_REJECT(vm, promise_capability, get_iterator(global_object, vm.argument(0)));
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// 7. Let result be PerformPromiseAllSettled(iteratorRecord, C, promiseCapability, promiseResolve).
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auto result = perform_promise_all_settled(global_object, *iterator_record, constructor, promise_capability, promise_resolve);
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// 8. If result is an abrupt completion, then
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if (result.is_error()) {
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// a. If iteratorRecord.[[Done]] is false, set result to IteratorClose(iteratorRecord, result).
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if (!iterator_record_is_complete(global_object, *iterator_record))
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result = iterator_close(*iterator_record, result.release_error());
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// b. IfAbruptRejectPromise(result, promiseCapability).
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TRY_OR_REJECT(vm, promise_capability, result);
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}
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// 9. Return Completion(result).
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return result.release_value();
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}
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// 27.2.4.3 Promise.any ( iterable ), https://tc39.es/ecma262/#sec-promise.any
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JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::any)
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{
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// 1. Let C be the this value.
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auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
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// 2. Let promiseCapability be ? NewPromiseCapability(C).
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auto promise_capability = TRY(new_promise_capability(global_object, constructor));
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// 3. Let promiseResolve be GetPromiseResolve(C).
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// 4. IfAbruptRejectPromise(promiseResolve, promiseCapability).
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auto promise_resolve = TRY_OR_REJECT(vm, promise_capability, get_promise_resolve(global_object, constructor));
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// 5. Let iteratorRecord be GetIterator(iterable).
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// 6. IfAbruptRejectPromise(iteratorRecord, promiseCapability).
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auto* iterator_record = TRY_OR_REJECT(vm, promise_capability, get_iterator(global_object, vm.argument(0)));
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// 7. Let result be PerformPromiseAny(iteratorRecord, C, promiseCapability, promiseResolve).
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auto result = perform_promise_any(global_object, *iterator_record, constructor, promise_capability, promise_resolve);
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// 8. If result is an abrupt completion, then
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if (result.is_error()) {
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// a. If iteratorRecord.[[Done]] is false, set result to IteratorClose(iteratorRecord, result).
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if (!iterator_record_is_complete(global_object, *iterator_record))
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result = iterator_close(*iterator_record, result.release_error());
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// b. IfAbruptRejectPromise(result, promiseCapability).
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TRY_OR_REJECT(vm, promise_capability, result);
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}
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// 9. Return Completion(result).
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return result.release_value();
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}
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|
||||
// 27.2.4.5 Promise.race ( iterable ), https://tc39.es/ecma262/#sec-promise.race
|
||||
JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::race)
|
||||
{
|
||||
// 1. Let C be the this value.
|
||||
auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
|
||||
|
||||
// 2. Let promiseCapability be ? NewPromiseCapability(C).
|
||||
auto promise_capability = TRY(new_promise_capability(global_object, constructor));
|
||||
|
||||
// 3. Let promiseResolve be GetPromiseResolve(C).
|
||||
// 4. IfAbruptRejectPromise(promiseResolve, promiseCapability).
|
||||
auto promise_resolve = TRY_OR_REJECT(vm, promise_capability, get_promise_resolve(global_object, constructor));
|
||||
|
||||
// 5. Let iteratorRecord be GetIterator(iterable).
|
||||
// 6. IfAbruptRejectPromise(iteratorRecord, promiseCapability).
|
||||
auto* iterator_record = TRY_OR_REJECT(vm, promise_capability, get_iterator(global_object, vm.argument(0)));
|
||||
|
||||
// 7. Let result be PerformPromiseRace(iteratorRecord, C, promiseCapability, promiseResolve).
|
||||
auto result = perform_promise_race(global_object, *iterator_record, constructor, promise_capability, promise_resolve);
|
||||
|
||||
// 8. If result is an abrupt completion, then
|
||||
if (result.is_error()) {
|
||||
// a. If iteratorRecord.[[Done]] is false, set result to IteratorClose(iteratorRecord, result).
|
||||
if (!iterator_record_is_complete(global_object, *iterator_record))
|
||||
result = iterator_close(*iterator_record, result.release_error());
|
||||
|
||||
// b. IfAbruptRejectPromise(result, promiseCapability).
|
||||
TRY_OR_REJECT(vm, promise_capability, result);
|
||||
}
|
||||
|
||||
// 9. Return Completion(result).
|
||||
return result.release_value();
|
||||
}
|
||||
|
||||
// 27.2.4.6 Promise.reject ( r ), https://tc39.es/ecma262/#sec-promise.reject
|
||||
JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::reject)
|
||||
{
|
||||
auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
|
||||
auto promise_capability = TRY(new_promise_capability(global_object, constructor));
|
||||
auto reason = vm.argument(0);
|
||||
|
||||
// 1. Let C be the this value.
|
||||
auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
|
||||
|
||||
// 2. Let promiseCapability be ? NewPromiseCapability(C).
|
||||
auto promise_capability = TRY(new_promise_capability(global_object, constructor));
|
||||
|
||||
// 3. Perform ? Call(promiseCapability.[[Reject]], undefined, « r »).
|
||||
[[maybe_unused]] auto result = TRY(vm.call(*promise_capability.reject, js_undefined(), reason));
|
||||
|
||||
// 4. Return promiseCapability.[[Promise]].
|
||||
return promise_capability.promise;
|
||||
}
|
||||
|
||||
// 27.2.4.7 Promise.resolve ( x ), https://tc39.es/ecma262/#sec-promise.resolve
|
||||
JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::resolve)
|
||||
{
|
||||
auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
|
||||
auto value = vm.argument(0);
|
||||
|
||||
// 1. Let C be the this value.
|
||||
// 2. If Type(C) is not Object, throw a TypeError exception.
|
||||
// FIXME: Don't coerce to object!
|
||||
auto* constructor = TRY(vm.this_value(global_object).to_object(global_object));
|
||||
|
||||
// 3. Return ? PromiseResolve(C, x).
|
||||
return TRY(promise_resolve(global_object, *constructor, value));
|
||||
}
|
||||
|
||||
// 27.2.4.8 get Promise [ @@species ], https://tc39.es/ecma262/#sec-get-promise-@@species
|
||||
JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::symbol_species_getter)
|
||||
{
|
||||
// 1. Return the this value.
|
||||
return vm.this_value(global_object);
|
||||
}
|
||||
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue