v8/test/mjsunit/harmony/weakrefs/cleanup-is-a-microtask.js

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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --harmony-weak-refs --expose-gc --noincremental-marking
// This test asserts that the cleanup function call, scheduled by GC, is a
// microtask and not a normal task.
// Inside a microtask, cause GC (which should schedule the cleanup as
// microtask). lso schedule another microtask. Assert that the cleanup
// function ran before the other microtask.
function scheduleMicrotask(func) {
Promise.resolve().then(func);
}
let log = [];
let cleanup = (iter) => {
log.push("cleanup");
for (holdings of iter) { }
}
let fg = new FinalizationGroup(cleanup);
let o = null;
(function() {
// Use a closure here to avoid other references to o which might keep it alive
// (e.g., stack frames pointing to it).
o = {};
fg.register(o, {});
})();
let microtask_after_cleanup = () => {
log.push("microtask_after_cleanup");
}
let first_microtask = function() {
log.push("first_microtask");
// This schedules the cleanup function as microtask.
o = null;
gc();
// Schedule a microtask which should run after the cleanup microtask.
scheduleMicrotask(microtask_after_cleanup);
}
scheduleMicrotask(first_microtask);
setTimeout(() => {
// Assert that the functions got called in the right order.
let wanted_log = ["first_microtask", "cleanup", "microtask_after_cleanup"];
assertEquals(wanted_log, log);
}, 0);