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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 --allow-natives-syntax
// 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.
let cleanedUp = false;
function scheduleMicrotask(func) {
Promise.resolve().then(func);
}
let log = [];
let cleanup = (holdings) => {
cleanedUp = true;
}
let fg = new FinalizationRegistry(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 = function() {
log.push("first_microtask");
// cause GC during a microtask
o = null;
gc();
}
assertFalse(cleanedUp);
// enqueue microtask that triggers GC
Promise.resolve().then(microtask);
// but cleanup callback hasn't been called yet, as we're still in
// synchronous execution
assertFalse(cleanedUp);
// flush the microtask queue to run the microtask that triggers GC
%PerformMicrotaskCheckpoint();
// still no cleanup callback, because it runs after as a separate task
assertFalse(cleanedUp);
setTimeout(() => {
assertTrue(cleanedUp);
}, 0);
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