b75b7f0c0d
Callers that are already in a fallible context will now TRY to allocate cells. Callers in infallible contexts get a FIXME.
75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/TypeCasts.h>
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#include <LibJS/Runtime/AsyncFunctionDriverWrapper.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/PromiseCapability.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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ThrowCompletionOr<Value> AsyncFunctionDriverWrapper::create(Realm& realm, GeneratorObject* generator_object)
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{
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auto wrapper = MUST_OR_THROW_OOM(realm.heap().allocate<AsyncFunctionDriverWrapper>(realm, realm, generator_object));
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return wrapper->react_to_async_task_completion(realm.vm(), js_undefined(), true);
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}
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AsyncFunctionDriverWrapper::AsyncFunctionDriverWrapper(Realm& realm, GeneratorObject* generator_object)
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: Promise(*realm.intrinsics().promise_prototype())
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, m_generator_object(generator_object)
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, m_on_fulfillment(NativeFunction::create(realm, "async.on_fulfillment"sv, [this](VM& vm) {
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return react_to_async_task_completion(vm, vm.argument(0), true);
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}))
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, m_on_rejection(NativeFunction::create(realm, "async.on_rejection"sv, [this](VM& vm) {
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return react_to_async_task_completion(vm, vm.argument(0), false);
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}))
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{
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}
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ThrowCompletionOr<Value> AsyncFunctionDriverWrapper::react_to_async_task_completion(VM& vm, Value value, bool is_successful)
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{
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auto& realm = *vm.current_realm();
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auto generator_result = is_successful
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? m_generator_object->resume(vm, value, {})
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: m_generator_object->resume_abrupt(vm, throw_completion(value), {});
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if (generator_result.is_throw_completion()) {
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VERIFY(generator_result.throw_completion().type() == Completion::Type::Throw);
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auto promise = Promise::create(realm);
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promise->reject(*generator_result.throw_completion().value());
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return promise;
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}
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auto result = generator_result.release_value();
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VERIFY(result.is_object());
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auto promise_value = TRY(result.get(vm, vm.names.value));
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if (!promise_value.is_object() || !is<Promise>(promise_value.as_object())) {
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auto promise = Promise::create(realm);
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promise->fulfill(promise_value);
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return promise;
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}
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auto promise = static_cast<Promise*>(&promise_value.as_object());
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if (TRY(result.get(vm, vm.names.done)).to_boolean())
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return promise;
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auto promise_capability = PromiseCapability::create(vm, promise, m_on_fulfillment, m_on_rejection);
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return promise->perform_then(m_on_fulfillment, m_on_rejection, promise_capability);
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}
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void AsyncFunctionDriverWrapper::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_generator_object);
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visitor.visit(m_on_fulfillment);
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visitor.visit(m_on_rejection);
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}
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}
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