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Java example source code file (Test8004741.java)

This example Java source code file (Test8004741.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

exception, interruptedexception, n\/2, not_started, object, running, stopping, test8004741, threaddeath, throwable, util

The Test8004741.java Java example source code

/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test Test8004741.java
 * @bug 8004741
 * @summary Missing compiled exception handle table entry for multidimensional array allocation
 * @run main/othervm -Xmx64m -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation -XX:+StressCompiledExceptionHandlers -XX:+SafepointALot -XX:GuaranteedSafepointInterval=100 Test8004741
 * @run main/othervm -Xmx64m -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation -XX:+StressCompiledExceptionHandlers Test8004741
 */

import java.util.*;

public class Test8004741 extends Thread {

  static int passed = 0;

  /**
   * Loop forever allocating 2-d arrays.
   * Catches and rethrows all exceptions; in the case of ThreadDeath, increments passed.
   * Note that passed is incremented here because this is the exception handler with
   * the smallest scope; we only want to declare success in the case where it is highly
   * likely that the test condition
   * (exception in 2-d array alloc interrupted by ThreadDeath)
   * actually occurs.
   */
  static int[][] test(int a, int b) throws Exception {
    int[][] ar;
    try {
      ar = new int[a][b];
    } catch (ThreadDeath e) {
      System.out.println("test got ThreadDeath");
      passed++;
      throw(e);
    }
    return ar;
  }

  /* Cookbook wait-notify to track progress of test thread. */
  Object progressLock = new Object();
  private static final int NOT_STARTED = 0;
  private static final int RUNNING = 1;
  private static final int STOPPING = 2;

  int progressState = NOT_STARTED;

  void toState(int state) {
    synchronized (progressLock) {
      progressState = state;
      progressLock.notify();
    }
  }

  void waitFor(int state) {
    synchronized (progressLock) {
      while (progressState < state) {
        try {
          progressLock.wait();
        } catch (InterruptedException e) {
          e.printStackTrace();
          System.out.println("unexpected InterruptedException");
          fail();
        }
      }
      if (progressState > state) {
        System.out.println("unexpected test state change, expected " +
                            state + " but saw " + progressState);
        fail();
      }
    }
  }

  /**
   * Loops running test until some sort of an exception or error,
   * expects to see ThreadDeath.
   */
  public void run() {
    try {
      // Print before state change, so that other thread is most likely
      // to see this thread executing calls to test() in a loop.
      System.out.println("thread running");
      toState(RUNNING);
      while (true) {
        // (2,2) (2,10) (2,100) were observed to tickle the bug;
        test(2, 100);
      }
    } catch (ThreadDeath e) {
      // nothing to say, passing was incremented by the test.
    } catch (Throwable e) {
      e.printStackTrace();
      System.out.println("unexpected Throwable " + e);
      fail();
    }
    toState(STOPPING);
  }

  /**
   * Runs a single trial of the test in a thread.
   * No single trial is definitive, since the ThreadDeath
   * exception might not land in the tested region of code.
   */
  public static void threadTest() throws InterruptedException {
    Test8004741 t = new Test8004741();
    t.start();
    t.waitFor(RUNNING);
    Thread.sleep(100);
    System.out.println("stopping thread");
    t.stop();
    t.waitFor(STOPPING);
    t.join();
  }

  public static void main(String[] args) throws Exception {
    // Warm up "test"
    // t will never be started.
    for (int n = 0; n < 11000; n++) {
      test(2, 100);
    }

    // Will this sleep help ensure that the compiler is run?
    Thread.sleep(500);
    passed = 0;

    try {
      test(-1, 100);
      System.out.println("Missing NegativeArraySizeException #1");
      fail();
    } catch ( java.lang.NegativeArraySizeException e ) {
      System.out.println("Saw expected NegativeArraySizeException #1");
    }

    try {
      test(100, -1);
      fail();
      System.out.println("Missing NegativeArraySizeException #2");
      fail();
    } catch ( java.lang.NegativeArraySizeException e ) {
      System.out.println("Saw expected NegativeArraySizeException #2");
    }

    /* Test repetitions.  If the test succeeds-mostly, it succeeds,
     * as long as it does not crash (the outcome if the exception range
     * table entry for the array allocation is missing).
     */
    int N = 12;
    for (int n = 0; n < N; n++) {
      threadTest();
    }

    if (passed > N/2) {
      System.out.println("Saw " + passed + " out of " + N + " possible ThreadDeath hits");
      System.out.println("PASSED");
    } else {
      System.out.println("Too few ThreadDeath hits; expected at least " + N/2 +
                         " but saw only " + passed);
      fail();
    }
  }

  static void fail() {
    System.out.println("FAILED");
    System.exit(97);
  }
};

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