1 /* 2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package gc.testlibrary; 25 26 public class Allocation { 27 public static volatile Object obj; 28 29 /** 30 * This code assigns the object to a "public static volatile" variable. The 31 * compiler does not seem capable of optimizing through this (yet). Any object 32 * allocated and sent to this method ought not to be optimized away. 33 * 34 * @param obj The allocation of this object will not be optimized away. 35 */ 36 blackHole(Object obj)37 public static void blackHole(Object obj) { 38 Allocation.obj = obj; 39 Allocation.obj = null; 40 } 41 } 42