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https://github.com/RGBCube/serenity
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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"
96 lines
3 KiB
C++
96 lines
3 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/FinalizationRegistry.h>
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namespace JS {
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FinalizationRegistry::FinalizationRegistry(Realm& realm, JS::JobCallback cleanup_callback, Object& prototype)
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: Object(prototype)
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, WeakContainer(heap())
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, m_realm(JS::make_handle(realm))
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, m_cleanup_callback(move(cleanup_callback))
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{
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}
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FinalizationRegistry::~FinalizationRegistry()
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{
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}
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void FinalizationRegistry::add_finalization_record(Cell& target, Value held_value, Object* unregister_token)
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{
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VERIFY(!held_value.is_empty());
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m_records.append({ &target, held_value, unregister_token });
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}
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bool FinalizationRegistry::remove_by_token(Object& unregister_token)
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{
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auto removed = false;
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for (auto it = m_records.begin(); it != m_records.end(); ++it) {
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if (it->unregister_token == &unregister_token) {
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it.remove(m_records);
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removed = true;
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}
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}
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return removed;
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}
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void FinalizationRegistry::remove_dead_cells(Badge<Heap>)
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{
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auto any_cells_were_removed = false;
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for (auto& record : m_records) {
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if (!record.target || record.target->state() == Cell::State::Live)
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continue;
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record.target = nullptr;
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any_cells_were_removed = true;
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break;
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}
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if (any_cells_were_removed)
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vm().host_enqueue_finalization_registry_cleanup_job(*this);
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}
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// 9.13 CleanupFinalizationRegistry ( finalizationRegistry ), https://tc39.es/ecma262/#sec-cleanup-finalization-registry
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ThrowCompletionOr<void> FinalizationRegistry::cleanup(Optional<JobCallback> callback)
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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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// 1. Assert: finalizationRegistry has [[Cells]] and [[CleanupCallback]] internal slots.
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// Note: Ensured by type.
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// 2. Let callback be finalizationRegistry.[[CleanupCallback]].
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auto& cleanup_callback = callback.has_value() ? callback.value() : m_cleanup_callback;
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// 3. While finalizationRegistry.[[Cells]] contains a Record cell such that cell.[[WeakRefTarget]] is empty, an implementation may perform the following steps:
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for (auto it = m_records.begin(); it != m_records.end(); ++it) {
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// a. Choose any such cell.
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if (it->target != nullptr)
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continue;
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// b. Remove cell from finalizationRegistry.[[Cells]].
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MarkedValueList arguments(vm.heap());
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arguments.append(it->held_value);
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it.remove(m_records);
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// c. Perform ? HostCallJobCallback(callback, undefined, « cell.[[HeldValue]] »).
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TRY(vm.host_call_job_callback(global_object, cleanup_callback, js_undefined(), move(arguments)));
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}
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// 4. Return NormalCompletion(empty).
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return {};
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}
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void FinalizationRegistry::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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for (auto& record : m_records) {
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visitor.visit(record.held_value);
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visitor.visit(record.unregister_token);
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}
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}
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}
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