f902b9dd8d
Bug: v8:8179 Change-Id: I0cd43db6558db616690de2dd012bf7518c49345d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2138563 Commit-Queue: Shu-yu Guo <syg@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#67069}
44 lines
1.3 KiB
JavaScript
44 lines
1.3 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
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let cleanup_called = false;
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let holdings_list = [];
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let cleanup = function(holdings) {
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assertFalse(cleanup_called);
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holdings_list.push(holdings);
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cleanup_called = true;
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}
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let fg = new FinalizationRegistry(cleanup);
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let o1 = {};
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let holdings = {'a': 'this is the holdings object'};
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// Ignition holds references to objects in temporary registers. These will be
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// released when the function exits. So only access o inside a function to
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// prevent any references to objects in temporary registers when a gc is
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// triggered.
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(() => {fg.register(o1, holdings);})()
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gc();
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assertFalse(cleanup_called);
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// Drop the last references to o1.
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(() => {o1 = null;})()
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// Drop the last reference to the holdings. The FinalizationRegistry keeps it
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// alive, so the cleanup function will be called as normal.
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holdings = null;
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gc();
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assertFalse(cleanup_called);
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let timeout_func = function() {
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assertTrue(cleanup_called);
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assertEquals(holdings_list.length, 1);
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assertEquals(holdings_list[0].a, "this is the holdings object");
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}
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setTimeout(timeout_func, 0);
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