b839ed4f24
These tests rely on dropping references to objects either explicitly ("o =
null;") or implicitly ("o goes out of scope") and then doing gc. It's essential
that we haven't already marked the WeakCell pointing to o and marked it alive
before dropping the reference.
BUG=v8:8179
Change-Id: Ie0b73f05c4baa937cf6f28325454ff9087a71a2c
Reviewed-on: https://chromium-review.googlesource.com/c/1306437
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57115}
57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-weak-refs --expose-gc --noincremental-marking
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// This test asserts that the cleanup function call, scheduled by GC, is a
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// microtask and not a normal task.
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// Inside a microtask, cause GC (which should schedule the cleanup as
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// microtask). lso schedule another microtask. Assert that the cleanup
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// function ran before the other microtask.
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function scheduleMicrotask(func) {
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Promise.resolve().then(func);
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}
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let log = [];
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let cleanup = (iter) => {
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log.push("cleanup");
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for (wc of iter) { }
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}
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let wf = new WeakFactory(cleanup);
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let o = null;
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(function() {
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// Use a closure here to avoid other references to o which might keep it alive
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// (e.g., stack frames pointing to it).
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o = {};
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wf.makeCell(o);
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})();
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let microtask_after_cleanup = () => {
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log.push("microtask_after_cleanup");
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}
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let first_microtask = function() {
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log.push("first_microtask");
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// This schedules the cleanup function as microtask.
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o = null;
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gc();
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// Schedule a microtask which should run after the cleanup microtask.
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scheduleMicrotask(microtask_after_cleanup);
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}
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scheduleMicrotask(first_microtask);
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setTimeout(() => {
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// Assert that the functions got called in the right order.
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let wanted_log = ["first_microtask", "cleanup", "microtask_after_cleanup"];
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assertEquals(wanted_log, log);
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}, 0);
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