1 /*
   2  * Copyright (c) 2011, 2013, 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  * @summary <rdar://problem/3569904> 142: threaded append double to String causes divide by zero on dual G5 (-Xint wo
  27  * @summary com.apple.junit.java.vm
  28  * @run junit R3569904ThreadedAppendDoubleDivByZeroTest
  29  */
  30 
  31 import junit.framework.*;
  32 import java.util.Timer;
  33 import java.util.TimerTask;
  34 
  35 public class R3569904ThreadedAppendDoubleDivByZeroTest extends TestCase {
  36     static volatile boolean continueTest = true;
  37 
  38     public static Test suite() {
  39         return new TestSuite(R3569904ThreadedAppendDoubleDivByZeroTest.class);
  40     }
  41 
  42     public static void main(String argv[]) {
  43         junit.textui.TestRunner.run(suite());
  44     }
  45 
  46     public void testDivByZeroException() throws Exception {
  47         String doubleBits = "0100000011001011111010111100110101110000010111111001000011100000";
  48         long doubleLong = 0l;
  49         for (int i = 0; i < doubleBits.length(); i++) {
  50             if (doubleBits.substring(i, i+1).equals("1")) {
  51                 doubleLong += 1l << (63-i);
  52             }
  53         }
  54         double d = Double.longBitsToDouble(doubleLong);
  55         // System.out.println("double value is "+d);
  56 
  57         int numThreads = 2;
  58         TestThread[] threads = new TestThread[numThreads];
  59         for (int i = 0; i < numThreads; i++) {
  60             threads[i] = new R3569904ThreadedAppendDoubleDivByZeroTest.TestThread(d);
  61             threads[i].start();
  62         }
  63         Timer t = new Timer(true);
  64         TimerTask task = new TimerTask() {
  65             public void run() {
  66                 R3569904ThreadedAppendDoubleDivByZeroTest.continueTest = false;
  67             }
  68         };
  69         t.schedule(task, 2000);
  70 
  71         for (int i = 0; i < numThreads; i++) {
  72             threads[i].join();
  73             assertFalse("Thread got an ArithmeticException", threads[i].gotArithmeticException);
  74         }
  75     }
  76 
  77     static class TestThread extends Thread {
  78         boolean gotArithmeticException = false;
  79 
  80         TestThread(double val) {
  81             this.val = val;
  82         }
  83 
  84         double val;
  85 
  86         public void run() {
  87             while(R3569904ThreadedAppendDoubleDivByZeroTest.continueTest){
  88                 doit(val);
  89             }
  90         }
  91 
  92         public void doit(double v) {
  93             try
  94             {
  95                 String s = "";
  96                 s+=v;
  97             } catch (ArithmeticException ae) {
  98                 ae.printStackTrace();
  99                 gotArithmeticException = true;
 100                 return;
 101             }
 102         }
 103     }
 104 }