jdk8-mips64-public/hotspot: test/compiler/6912517/Test.java@1271af4ec18c (annotated)

test/compiler/6912517/Test.java@1271af4ec18c (annotated)

test/compiler/6912517/Test.java

Thu, 07 Jan 2010 16:26:31 -0800

author: kvn
date: Thu, 07 Jan 2010 16:26:31 -0800
changeset 1586: 1271af4ec18c
child 1907: c18cbe5936b8
permissions: -rw-r--r--

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

 /*
  * Copyright 2009 D.E. Shaw.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  */
 /**
  * @test
  * @bug 6912517
  * @summary JIT bug compiles out (and stops running) code that needs to be run.  Causes NPE.
  *
  * @run main/othervm -Xbatch -XX:CompileThreshold=100 -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops Test
  */
 /**
  * Highlights a bug with the JIT compiler.
  * @author Matt Bruce m b r u c e __\at/__ g m a i l DOT c o m
  */
 public class Test implements Runnable
 {
     private final Thread myThread;
     private Thread       myInitialThread;
     private boolean      myShouldCheckThreads;
     /**
      * Sets up the running thread, and starts it.
      */
     public Test(int id)
     {
         myThread = new Thread(this);
         myThread.setName("Runner: " + id);
         myThread.start();
         myShouldCheckThreads = false;
     }
     /**
      * @param shouldCheckThreads the shouldCheckThreads to set
      */
     public void setShouldCheckThreads(boolean shouldCheckThreads)
     {
         myShouldCheckThreads = shouldCheckThreads;
     }
     /**
      * Starts up the two threads with enough delay between them for JIT to
      * kick in.
      * @param args
      * @throws InterruptedException
      */
     public static void main(String[] args) throws InterruptedException
     {
         // let this run for a bit, so the "run" below is JITTed.
         for (int id = 0; id < 20; id++) {
             System.out.println("Starting thread: " + id);
             Test bug = new Test(id);
             bug.setShouldCheckThreads(true);
             Thread.sleep(2500);
         }
     }
     /**
      * @see java.lang.Runnable#run()
      */
     public void run()
     {
         long runNumber = 0;
         while (true) {
             // run hot for a little while, give JIT time to kick in to this loop.
             // then run less hot.
             if (runNumber > 15000) {
                 try {
                     Thread.sleep(5);
                 }
                 catch (InterruptedException e) {
                     e.printStackTrace();
                 }
             }
             runNumber++;
             ensureProperCallingThread();
         }
     }
     private void ensureProperCallingThread()
     {
         // this should never be null.  but with the JIT bug, it will be.
         // JIT BUG IS HERE ==>>>>>
         if (myShouldCheckThreads) {
             if (myInitialThread == null) {
                 myInitialThread = Thread.currentThread();
             }
             else if (myInitialThread != Thread.currentThread()) {
                 System.out.println("Not working: " + myInitialThread.getName());
             }
         }
     }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

test/compiler/6912517/Test.java@1271af4ec18c (annotated)

test/compiler/6912517/Test.java