Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: test/compiler/6912517/Test.java
test/compiler/6912517/Test.java
- changeset 1586
- 1271af4ec18c
- child 1907
- c18cbe5936b8
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| 1585:f62a22282a47 | 1586:1271af4ec18c |
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| 1 /* | |
| 2 * Copyright 2009 D.E. Shaw. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 */ | |
| 23 | |
| 24 /** | |
| 25 * @test | |
| 26 * @bug 6912517 | |
| 27 * @summary JIT bug compiles out (and stops running) code that needs to be run. Causes NPE. | |
| 28 * | |
| 29 * @run main/othervm -Xbatch -XX:CompileThreshold=100 -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops Test | |
| 30 */ | |
| 31 | |
| 32 /** | |
| 33 * Highlights a bug with the JIT compiler. | |
| 34 * @author Matt Bruce m b r u c e __\at/__ g m a i l DOT c o m | |
| 35 */ | |
| 36 public class Test implements Runnable | |
| 37 { | |
| 38 private final Thread myThread; | |
| 39 private Thread myInitialThread; | |
| 40 private boolean myShouldCheckThreads; | |
| 41 | |
| 42 /** | |
| 43 * Sets up the running thread, and starts it. | |
| 44 */ | |
| 45 public Test(int id) | |
| 46 { | |
| 47 myThread = new Thread(this); | |
| 48 myThread.setName("Runner: " + id); | |
| 49 myThread.start(); | |
| 50 myShouldCheckThreads = false; | |
| 51 } | |
| 52 | |
| 53 /** | |
| 54 * @param shouldCheckThreads the shouldCheckThreads to set | |
| 55 */ | |
| 56 public void setShouldCheckThreads(boolean shouldCheckThreads) | |
| 57 { | |
| 58 myShouldCheckThreads = shouldCheckThreads; | |
| 59 } | |
| 60 | |
| 61 /** | |
| 62 * Starts up the two threads with enough delay between them for JIT to | |
| 63 * kick in. | |
| 64 * @param args | |
| 65 * @throws InterruptedException | |
| 66 */ | |
| 67 public static void main(String[] args) throws InterruptedException | |
| 68 { | |
| 69 // let this run for a bit, so the "run" below is JITTed. | |
| 70 for (int id = 0; id < 20; id++) { | |
| 71 System.out.println("Starting thread: " + id); | |
| 72 Test bug = new Test(id); | |
| 73 bug.setShouldCheckThreads(true); | |
| 74 Thread.sleep(2500); | |
| 75 } | |
| 76 } | |
| 77 | |
| 78 /** | |
| 79 * @see java.lang.Runnable#run() | |
| 80 */ | |
| 81 public void run() | |
| 82 { | |
| 83 long runNumber = 0; | |
| 84 while (true) { | |
| 85 // run hot for a little while, give JIT time to kick in to this loop. | |
| 86 // then run less hot. | |
| 87 if (runNumber > 15000) { | |
| 88 try { | |
| 89 Thread.sleep(5); | |
| 90 } | |
| 91 catch (InterruptedException e) { | |
| 92 e.printStackTrace(); | |
| 93 } | |
| 94 } | |
| 95 runNumber++; | |
| 96 ensureProperCallingThread(); | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 private void ensureProperCallingThread() | |
| 101 { | |
| 102 // this should never be null. but with the JIT bug, it will be. | |
| 103 // JIT BUG IS HERE ==>>>>> | |
| 104 if (myShouldCheckThreads) { | |
| 105 if (myInitialThread == null) { | |
| 106 myInitialThread = Thread.currentThread(); | |
| 107 } | |
| 108 else if (myInitialThread != Thread.currentThread()) { | |
| 109 System.out.println("Not working: " + myInitialThread.getName()); | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 } |
