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49 lines
977 B
JavaScript
49 lines
977 B
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 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 = new WeakRef(o1);
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wr2 = new WeakRef(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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%PerformMicrotaskCheckpoint();
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// New turn.
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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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%PerformMicrotaskCheckpoint();
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// New turn.
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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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%PerformMicrotaskCheckpoint();
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// New turn.
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assertEquals(undefined, wr1.deref());
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gc();
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%PerformMicrotaskCheckpoint();
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// New turn.
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assertEquals(undefined, wr2.deref());
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