mirror of https://github.com/tc39/test262.git
58 lines
1.4 KiB
JavaScript
58 lines
1.4 KiB
JavaScript
// Copyright (C) 2019 Ecma International. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: >
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Collection of functions used to capture references cleanup from garbage collectors
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features: [FinalizationRegistry.prototype.cleanupSome, FinalizationRegistry, Symbol, async-functions]
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flags: [non-deterministic]
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defines: [asyncGC, asyncGCDeref, resolveAsyncGC]
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---*/
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function asyncGC(...targets) {
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var finalizationRegistry = new FinalizationRegistry(() => {});
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var length = targets.length;
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for (let target of targets) {
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finalizationRegistry.register(target, 'target');
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target = null;
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}
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targets = null;
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return Promise.resolve('tick').then(() => asyncGCDeref()).then(() => {
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var names = [];
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// consume iterator to capture names
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finalizationRegistry.cleanupSome(name => { names.push(name); });
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if (!names || names.length != length) {
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throw asyncGC.notCollected;
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}
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});
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}
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asyncGC.notCollected = Symbol('Object was not collected');
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async function asyncGCDeref() {
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var trigger;
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// TODO: Remove this when $262.clearKeptObject becomes documented and required
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if ($262.clearKeptObjects) {
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trigger = $262.clearKeptObjects();
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}
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await $262.gc();
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return Promise.resolve(trigger);
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}
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function resolveAsyncGC(err) {
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if (err === asyncGC.notCollected) {
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// Do not fail as GC can't provide necessary resources.
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$DONE();
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return;
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}
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$DONE(err);
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}
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