a51f3fc652
- Add the WeakRef class and its deref() function. - Add WeakFactory.prototype.makeRef - Implement the "keep during job" behavior for WeakRef constructor and deref(). - Here we keep the targets alive longer than until the end of the job (microtask), contradicting the spec. However, this is probably the indended behavior, see https://github.com/tc39/proposal-weakrefs/issues/39 . BUG=v8:8179 Change-Id: I41990d41ac1799e34f675d8431b9a7aa7ed3d48d Reviewed-on: https://chromium-review.googlesource.com/c/1306435 Commit-Queue: Marja Hölttä <marja@chromium.org> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#57242}
46 lines
1.0 KiB
JavaScript
46 lines
1.0 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 --allow-natives-syntax
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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(2, cells.length);
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assertTrue(cells.includes(weak_ref));
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assertTrue(cells.includes(weak_cell));
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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 weak_ref;
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let weak_cell;
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(function() {
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let o = {};
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weak_ref = wf.makeRef(o);
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weak_cell = wf.makeRef(o);
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})();
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// Since the WeakRef was created during this turn, it is not cleared by GC. The
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// WeakCell is not cleared either, since the WeakRef keeps the target object
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// alive.
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gc();
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(function() {
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assertNotEquals(undefined, weak_ref.deref());
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})();
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%RunMicrotasks();
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// Next turn.
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gc();
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%RunMicrotasks();
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// Next turn.
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assertTrue(cleanup_called);
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