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72 lines
1.4 KiB
JavaScript
72 lines
1.4 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_count = 0;
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let cleared_cells1 = [];
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let cleared_cells2 = [];
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let cleanup = function(iter) {
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if (cleanup_count == 0) {
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for (wc of iter) {
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cleared_cells1.push(wc);
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}
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} else {
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assertEquals(1, cleanup_count);
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for (wc of iter) {
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cleared_cells2.push(wc);
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}
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}
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++cleanup_count;
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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 wr1;
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let wr2;
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(function() {
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wr1 = wf.makeRef(o1);
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wr2 = wf.makeRef(o2);
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})();
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// Since the WeakRefs were created during this turn, they're not cleared by GC.
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gc();
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(function() {
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assertNotEquals(undefined, wr1.deref());
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assertNotEquals(undefined, wr2.deref());
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})();
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%RunMicrotasks();
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// New turn.
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assertEquals(0, cleanup_count);
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wr1.deref();
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o1 = null;
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gc(); // deref makes sure we don't clean up wr1
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%RunMicrotasks();
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// New turn.
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assertEquals(0, cleanup_count);
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wr2.deref();
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o2 = null;
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gc(); // deref makes sure we don't clean up wr2
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%RunMicrotasks();
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// New turn.
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assertEquals(1, cleanup_count);
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assertEquals(wr1, cleared_cells1[0]);
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gc();
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%RunMicrotasks();
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// New turn.
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assertEquals(2, cleanup_count);
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assertEquals(wr2, cleared_cells2[0]);
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