1 /*
   2  * Copyright (c) 2009, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /**
  25  * @test
  26  * @bug 6589834
  27  * @summary deoptimization problem with -XX:+DeoptimizeALot
  28  *
  29  * @run main Test_ia32
  30  */
  31 
  32 /***************************************************************************************
  33 NOTE: The bug shows up (with several "Bug!" message) even without the
  34       flag -XX:+DeoptimizeALot. In a debug build, you may want to try
  35       the flags -XX:+VerifyStack and -XX:+DeoptimizeALot to get more information.
  36 ****************************************************************************************/
  37 import java.lang.reflect.Constructor;
  38 
  39 public class Test_ia32 {
  40 
  41     public static int NUM_THREADS = 100;
  42 
  43     public static int CLONE_LENGTH = 1000;
  44 
  45     public static void main(String[] args) throws InterruptedException, ClassNotFoundException {
  46 
  47         Reflector[] threads = new Reflector[NUM_THREADS];
  48         for (int i = 0; i < threads.length; i++) {
  49             threads[i] = new Reflector();
  50             threads[i].start();
  51         }
  52 
  53         System.out.println("Give Reflector.run() some time to compile...");
  54         Thread.sleep(5000);
  55 
  56         System.out.println("Load RMISecurityException causing run() deoptimization");
  57         ClassLoader.getSystemClassLoader().loadClass("java.rmi.RMISecurityException");
  58 
  59         for (Reflector thread : threads)
  60             thread.requestStop();
  61 
  62         for (Reflector thread : threads)
  63             try {
  64                 thread.join();
  65             } catch (InterruptedException e) {
  66                 System.out.println(e);
  67             }
  68 
  69     }
  70 
  71 }
  72 
  73 class Reflector extends Thread {
  74 
  75     volatile boolean _doSpin = true;
  76 
  77     Test_ia32[] _tests;
  78 
  79     Reflector() {
  80         _tests = new Test_ia32[Test_ia32.CLONE_LENGTH];
  81         for (int i = 0; i < _tests.length; i++) {
  82             _tests[i] = new Test_ia32();
  83         }
  84     }
  85 
  86     static int g(int i1, int i2, Test_ia32[] arr, int i3, int i4) {
  87 
  88         if (!(i1==1 && i2==2 && i3==3 && i4==4)) {
  89             System.out.println("Bug!");
  90         }
  91 
  92         return arr.length;
  93     }
  94 
  95     static int f(Test_ia32[] arr) {
  96         return g(1, 2, arr.clone(), 3, 4);
  97     }
  98 
  99     @Override
 100     public void run() {
 101         Constructor[] ctrs = null;
 102         Class<Test_ia32> klass = Test_ia32.class;
 103         try {
 104             ctrs = klass.getConstructors();
 105         } catch (SecurityException e) {
 106             System.out.println(e);
 107         }
 108 
 109         try {
 110             while (_doSpin) {
 111                 if (f(_tests) < 0)
 112                     System.out.println("return value usage");
 113             }
 114         } catch (NullPointerException e) {
 115             e.printStackTrace();
 116         }
 117 
 118         System.out.println(this + " - stopped.");
 119     }
 120 
 121     public void requestStop() {
 122         System.out.println(this + " - stop requested.");
 123         _doSpin = false;
 124     }
 125 
 126 }