// Copyright 2018 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // Flags: --expose-gc --noincremental-marking let cleanup_called = 0; let holdings_list = []; let cleanup = function(holdings) { holdings_list.push(holdings); cleanup_called++; } let fg = new FinalizationRegistry(cleanup); let o1 = {}; let o2 = {}; // Ignition holds references to objects in temporary registers. These will be // released when the function exits. So only access o inside a function to // prevent any references to objects in temporary registers when a gc is (function() { fg.register(o1, 1); fg.register(o2, 2); })(); gc(); assertEquals(cleanup_called, 0); // Drop the last references to o1 and o2. (function() { o1 = null; o2 = null; })(); // GC will reclaim the target objects; the cleanup function will be called the // next time we enter the event loop. gc(); assertEquals(cleanup_called, 0); let timeout_func = function() { assertEquals(cleanup_called, 2); assertEquals(holdings_list.length, 2); if (holdings_list[0] == 1) { assertEquals(holdings_list[1], 2); } else { assertEquals(holdings_list[0], 2); assertEquals(holdings_list[1], 1); } } setTimeout(timeout_func, 0);