77 lines
1.7 KiB
JavaScript
77 lines
1.7 KiB
JavaScript
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// 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 cleanup_cells = [];
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let cleanup = function(iter) {
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for (wc of iter) {
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assertEquals(undefined, wc.deref());
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cleanup_cells.push(wc);
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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 wf_control = new WeakFactory(cleanup);
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let wr;
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let wr_control; // control WeakRef for testing what happens without deref
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(function() {
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let o1 = {};
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wr = wf.makeRef(o1);
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let o2 = {};
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wr_control = wf_control.makeRef(o2);
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})();
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let strong = {a: wr.deref(), b: wr_control.deref()};
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gc();
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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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// We have a strong reference to the objects, so the WeakRefs are not cleared yet.
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assertEquals(0, cleanup_count);
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// Call deref inside a closure, trying to avoid accidentally storing a strong
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// reference into the object in the stack frame.
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(function() {
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wr.deref();
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})();
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strong = null;
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// This GC will clear wr_control.
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gc();
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(function() {
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assertNotEquals(undefined, wr.deref());
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// Now the control WeakRef got cleared, since nothing was keeping it alive.
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assertEquals(undefined, wr_control.deref());
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})();
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%RunMicrotasks();
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// Next turn.
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assertEquals(1, cleanup_count);
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assertEquals(1, cleanup_cells.length);
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assertEquals(wc, cleanup_cells[0]);
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gc();
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%RunMicrotasks();
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// Next turn.
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assertEquals(2, cleanup_count);
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assertEquals(2, cleanup_cells.length);
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assertEquals(wr, cleanup_cells[1]);
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assertEquals(undefined, wr.deref());
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