Mercurial > hg > truffle
comparison test/compiler/6912517/Test.java @ 1151:1271af4ec18c
6912517: JIT bug compiles out (and stops running) code that needs to be run. Causes NPE.
Summary: Add missing check that value is used in memory expression in instructions with embedded load.
Reviewed-by: never, jrose
author | kvn |
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date | Thu, 07 Jan 2010 16:26:31 -0800 |
parents | |
children | c18cbe5936b8 |
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1150:f62a22282a47 | 1151:1271af4ec18c |
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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 } |