Mercurial > hg > truffle
annotate test/compiler/membars/TestMemBarAcquire.java @ 20449:2402de236865
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author | drchase |
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date | Wed, 10 Sep 2014 21:45:28 +0000 |
parents | 91cb3b8aac2b |
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1 /* |
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test TestMemBarAcquire |
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26 * @bug 8048879 |
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27 * @summary "Tests optimization of MemBarAcquireNodes" |
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28 * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation TestMemBarAcquire |
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29 */ |
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30 public class TestMemBarAcquire { |
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31 private volatile static Object defaultObj = new Object(); |
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32 private Object obj; |
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33 |
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34 public TestMemBarAcquire(Object param) { |
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35 // Volatile load. MemBarAcquireNode is added after the |
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36 // load to prevent following loads from floating up past. |
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37 // StoreNode is added to store result of load in 'obj'. |
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38 this.obj = defaultObj; |
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39 // Overrides 'obj' and therefore makes previous StoreNode |
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40 // and the corresponding LoadNode useless. However, the |
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41 // LoadNode is still connected to the MemBarAcquireNode |
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42 // that should now release the reference. |
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43 this.obj = param; |
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44 } |
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45 |
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46 public static void main(String[] args) throws Exception { |
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47 // Make sure TestMemBarAcquire::<init> is compiled |
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48 for (int i = 0; i < 100000; ++i) { |
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49 TestMemBarAcquire p = new TestMemBarAcquire(new Object()); |
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50 } |
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51 } |
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52 } |
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53 |