4c1c6ef91c
This allows the host of LibJS (notably LibWeb in this case) to override certain functions such as HostEnqueuePromiseJob, so it can do it's own thing in certain situations. Notably, LibWeb will override HostEnqueuePromiseJob to put promise jobs on the microtask queue. This also makes promise jobs use AK::Function instead of JS::NativeFunction. This removes the need to go through a JavaScript function and it more closely matches the spec's idea of "abstract closures"
65 lines
2.9 KiB
C++
65 lines
2.9 KiB
C++
/*
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@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 <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/FinalizationRegistry.h>
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#include <LibJS/Runtime/FinalizationRegistryConstructor.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/JobCallback.h>
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namespace JS {
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FinalizationRegistryConstructor::FinalizationRegistryConstructor(GlobalObject& global_object)
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: NativeFunction(vm().names.FinalizationRegistry.as_string(), *global_object.function_prototype())
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{
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}
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void FinalizationRegistryConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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// 26.2.2.1 FinalizationRegistry.prototype, https://tc39.es/ecma262/#sec-finalization-registry.prototype
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define_direct_property(vm.names.prototype, global_object.finalization_registry_prototype(), 0);
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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}
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FinalizationRegistryConstructor::~FinalizationRegistryConstructor()
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{
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}
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// 26.2.1.1 FinalizationRegistry ( cleanupCallback ), https://tc39.es/ecma262/#sec-finalization-registry-cleanup-callback
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ThrowCompletionOr<Value> FinalizationRegistryConstructor::call()
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{
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auto& vm = this->vm();
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return vm.throw_completion<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.FinalizationRegistry);
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}
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// 26.2.1.1 FinalizationRegistry ( cleanupCallback ), https://tc39.es/ecma262/#sec-finalization-registry-cleanup-callback
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ThrowCompletionOr<Object*> FinalizationRegistryConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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// NOTE: Step 1 is implemented in FinalizationRegistryConstructor::call()
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// 2. If IsCallable(cleanupCallback) is false, throw a TypeError exception.
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auto cleanup_callback = vm.argument(0);
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if (!cleanup_callback.is_function())
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return vm.throw_completion<TypeError>(global_object, ErrorType::NotAFunction, cleanup_callback.to_string_without_side_effects());
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// 3. Let finalizationRegistry be ? OrdinaryCreateFromConstructor(NewTarget, "%FinalizationRegistry.prototype%", « [[Realm]], [[CleanupCallback]], [[Cells]] »).
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// 4. Let fn be the active function object. (NOTE: Not necessary. The active function object is `this`)
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// 5. Set finalizationRegistry.[[Realm]] to fn.[[Realm]].
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// 6. Set finalizationRegistry.[[CleanupCallback]] to HostMakeJobCallback(cleanupCallback).
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// 7. Set finalizationRegistry.[[Cells]] to a new empty List. (NOTE: This is done inside FinalizationRegistry instead of here)
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// 8. Return finalizationRegistry.
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return TRY(ordinary_create_from_constructor<FinalizationRegistry>(global_object, new_target, &GlobalObject::finalization_registry_prototype, *realm(), vm.host_make_job_callback(cleanup_callback.as_function())));
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}
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}
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