40 lines
1.1 KiB
JavaScript
40 lines
1.1 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 --noincremental-marking
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load("./resources/v8-mjsunit.js", "caller relative");
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let cleanup_call_count = 0;
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let cleanup = function(holdings) {
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++cleanup_call_count;
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}
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let fg = new FinalizationRegistry(cleanup);
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let key = {"k": "this is the key"};
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// Create an object and register it in the FinalizationRegistry. The object needs
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// to be inside a closure so that we can reliably kill them!
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(function() {
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let object = {};
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fg.register(object, "my holdings", key);
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// Clear the WeakCell before the GC has a chance to discover it.
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let success = fg.unregister(key);
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assertTrue(success);
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// object goes out of scope.
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})();
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// This GC will reclaim the target object.
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gc();
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assertEquals(0, cleanup_call_count);
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// Assert that the cleanup function won't be called, since we called unregister.
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let timeout_func = function() {
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assertEquals(0, cleanup_call_count);
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}
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setTimeout(timeout_func, 0);
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