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annotate test/compiler/6912517/Test.java @ 18408:2c3666f44855

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Truffle: initial commit of object API implementation
author Andreas Woess <andreas.woess@jku.at>
date Tue, 18 Nov 2014 23:19:43 +0100
parents c18cbe5936b8
children
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1151
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1 /*
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2 * Copyright 2009 D.E. Shaw. 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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c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories
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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
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26 * @bug 6912517
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27 * @summary JIT bug compiles out (and stops running) code that needs to be run. Causes NPE.
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28 *
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29 * @run main/othervm -Xbatch -XX:CompileThreshold=100 -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops Test
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30 */
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31
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32 /**
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33 * Highlights a bug with the JIT compiler.
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34 * @author Matt Bruce m b r u c e __\at/__ g m a i l DOT c o m
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35 */
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36 public class Test implements Runnable
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37 {
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38 private final Thread myThread;
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39 private Thread myInitialThread;
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40 private boolean myShouldCheckThreads;
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41
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42 /**
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43 * Sets up the running thread, and starts it.
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44 */
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45 public Test(int id)
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46 {
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47 myThread = new Thread(this);
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48 myThread.setName("Runner: " + id);
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49 myThread.start();
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50 myShouldCheckThreads = false;
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51 }
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52
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53 /**
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54 * @param shouldCheckThreads the shouldCheckThreads to set
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55 */
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56 public void setShouldCheckThreads(boolean shouldCheckThreads)
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57 {
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58 myShouldCheckThreads = shouldCheckThreads;
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59 }
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60
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61 /**
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62 * Starts up the two threads with enough delay between them for JIT to
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63 * kick in.
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64 * @param args
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65 * @throws InterruptedException
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66 */
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67 public static void main(String[] args) throws InterruptedException
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68 {
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69 // let this run for a bit, so the "run" below is JITTed.
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70 for (int id = 0; id < 20; id++) {
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71 System.out.println("Starting thread: " + id);
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72 Test bug = new Test(id);
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73 bug.setShouldCheckThreads(true);
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74 Thread.sleep(2500);
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75 }
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76 }
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77
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78 /**
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79 * @see java.lang.Runnable#run()
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80 */
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81 public void run()
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82 {
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83 long runNumber = 0;
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84 while (true) {
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85 // run hot for a little while, give JIT time to kick in to this loop.
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86 // then run less hot.
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87 if (runNumber > 15000) {
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88 try {
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89 Thread.sleep(5);
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90 }
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91 catch (InterruptedException e) {
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92 e.printStackTrace();
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93 }
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94 }
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95 runNumber++;
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96 ensureProperCallingThread();
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97 }
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98 }
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99
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100 private void ensureProperCallingThread()
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101 {
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102 // this should never be null. but with the JIT bug, it will be.
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103 // JIT BUG IS HERE ==>>>>>
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104 if (myShouldCheckThreads) {
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105 if (myInitialThread == null) {
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106 myInitialThread = Thread.currentThread();
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107 }
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108 else if (myInitialThread != Thread.currentThread()) {
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109 System.out.println("Not working: " + myInitialThread.getName());
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110 }
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111 }
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112 }
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113 }