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
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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
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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