ladybird/Userland/Libraries/LibJS/Runtime/FinalizationRegistryConstructor.cpp

/*
 * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/FinalizationRegistry.h>
#include <LibJS/Runtime/FinalizationRegistryConstructor.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/JobCallback.h>

namespace JS {

FinalizationRegistryConstructor::FinalizationRegistryConstructor(Realm& realm)
    : NativeFunction(realm.vm().names.FinalizationRegistry.as_string(), *realm.intrinsics().function_prototype())
{
}

ThrowCompletionOr<void> FinalizationRegistryConstructor::initialize(Realm& realm)
{
    auto& vm = this->vm();
    MUST_OR_THROW_OOM(NativeFunction::initialize(realm));

    // 26.2.2.1 FinalizationRegistry.prototype, https://tc39.es/ecma262/#sec-finalization-registry.prototype
    define_direct_property(vm.names.prototype, realm.intrinsics().finalization_registry_prototype(), 0);

    define_direct_property(vm.names.length, Value(1), Attribute::Configurable);

    return {};
}

// 26.2.1.1 FinalizationRegistry ( cleanupCallback ), https://tc39.es/ecma262/#sec-finalization-registry-cleanup-callback
ThrowCompletionOr<Value> FinalizationRegistryConstructor::call()
{
    auto& vm = this->vm();

    // 1. If NewTarget is undefined, throw a TypeError exception.
    return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.FinalizationRegistry);
}

// 26.2.1.1 FinalizationRegistry ( cleanupCallback ), https://tc39.es/ecma262/#sec-finalization-registry-cleanup-callback
ThrowCompletionOr<NonnullGCPtr<Object>> FinalizationRegistryConstructor::construct(FunctionObject& new_target)
{
    auto& vm = this->vm();

    // 2. If IsCallable(cleanupCallback) is false, throw a TypeError exception.
    auto cleanup_callback = vm.argument(0);
    if (!cleanup_callback.is_function())
        return vm.throw_completion<TypeError>(ErrorType::NotAFunction, TRY_OR_THROW_OOM(vm, cleanup_callback.to_string_without_side_effects()));

    // 3. Let finalizationRegistry be ? OrdinaryCreateFromConstructor(NewTarget, "%FinalizationRegistry.prototype%", « [[Realm]], [[CleanupCallback]], [[Cells]] »).
    // 4. Let fn be the active function object.
    // NOTE: This is not necessary, the active function object is `this`.
    // 5. Set finalizationRegistry.[[Realm]] to fn.[[Realm]].
    // 6. Set finalizationRegistry.[[CleanupCallback]] to HostMakeJobCallback(cleanupCallback).
    // 7. Set finalizationRegistry.[[Cells]] to a new empty List.
    // NOTE: This is done inside FinalizationRegistry instead of here.
    // 8. Return finalizationRegistry.
    return TRY(ordinary_create_from_constructor<FinalizationRegistry>(vm, new_target, &Intrinsics::finalization_registry_prototype, *realm(), vm.host_make_job_callback(cleanup_callback.as_function())));
}

}