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}
50 lines
1.2 KiB
JavaScript
50 lines
1.2 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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let cleanup_called = false;
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let cleanup = function(iter) {
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assertFalse(cleanup_called);
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let cells = [];
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for (wc of iter) {
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cells.push(wc);
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}
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assertEquals(cells.length, 2);
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if (cells[0] == wc1) {
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assertEquals(cells[0].holdings, 1);
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assertEquals(cells[1], wc2);
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assertEquals(cells[1].holdings, 2);
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} else {
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assertEquals(cells[0], wc2);
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assertEquals(cells[0].holdings, 2);
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assertEquals(cells[1], wc1);
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assertEquals(cells[1].holdings, 1);
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}
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cleanup_called = true;
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}
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let wf = new WeakFactory(cleanup);
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let o1 = {};
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let o2 = {};
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let wc1 = wf.makeCell(o1, 1);
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let wc2 = wf.makeCell(o2, 2);
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gc();
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assertFalse(cleanup_called);
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// Drop the last references to o1 and o2.
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o1 = null;
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o2 = null;
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// GC will clear the WeakCells; the cleanup function will be called the next time
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// we enter the event loop.
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gc();
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assertFalse(cleanup_called);
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let timeout_func = function() {
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assertTrue(cleanup_called);
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}
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setTimeout(timeout_func, 0);
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