117 lines
3.6 KiB
Java
117 lines
3.6 KiB
Java
/*
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* Copyright 2009 D.E. Shaw. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 6912517
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* @summary JIT bug compiles out (and stops running) code that needs to be run. Causes NPE.
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*
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* @run main/othervm -Xbatch -XX:CompileThreshold=100 -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops
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* compiler.c2.Test6912517
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*/
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package compiler.c2;
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/**
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* Highlights a bug with the JIT compiler.
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* @author Matt Bruce m b r u c e __\at/__ g m a i l DOT c o m
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*/
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public class Test6912517 implements Runnable
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{
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private final Thread myThread;
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private Thread myInitialThread;
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private boolean myShouldCheckThreads;
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/**
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* Sets up the running thread, and starts it.
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*/
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public Test6912517(int id)
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{
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myThread = new Thread(this);
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myThread.setName("Runner: " + id);
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myThread.start();
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myShouldCheckThreads = false;
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}
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/**
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* @param shouldCheckThreads the shouldCheckThreads to set
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*/
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public void setShouldCheckThreads(boolean shouldCheckThreads)
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{
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myShouldCheckThreads = shouldCheckThreads;
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}
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/**
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* Starts up the two threads with enough delay between them for JIT to
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* kick in.
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* @param args
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* @throws InterruptedException
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*/
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public static void main(String[] args) throws InterruptedException
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{
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// let this run for a bit, so the "run" below is JITTed.
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for (int id = 0; id < 20; id++) {
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System.out.println("Starting thread: " + id);
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Test6912517 bug = new Test6912517(id);
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bug.setShouldCheckThreads(true);
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Thread.sleep(2500);
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}
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}
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/**
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* @see java.lang.Runnable#run()
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*/
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public void run()
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{
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long runNumber = 0;
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while (true) {
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// run hot for a little while, give JIT time to kick in to this loop.
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// then run less hot.
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if (runNumber > 15000) {
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try {
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Thread.sleep(5);
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}
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catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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runNumber++;
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ensureProperCallingThread();
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}
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}
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private void ensureProperCallingThread()
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{
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// this should never be null. but with the JIT bug, it will be.
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// JIT BUG IS HERE ==>>>>>
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if (myShouldCheckThreads) {
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if (myInitialThread == null) {
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myInitialThread = Thread.currentThread();
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}
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else if (myInitialThread != Thread.currentThread()) {
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System.out.println("Not working: " + myInitialThread.getName());
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}
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}
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}
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}
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