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Java example source code file (Test5091921.java)

This example Java source code file (Test5091921.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

arithmeticexception, runtimeexception, test5091921

The Test5091921.java Java example source code

/*
 * Copyright (c) 2011 Hewlett-Packard Company. 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
 * @bug 5091921
 * @summary Sign flip issues in loop optimizer
 *
 * @run main/othervm -Xcomp -XX:CompileOnly=Test5091921 -XX:MaxInlineSize=1 Test5091921
 */

public class Test5091921 {
  private static int result = 0;


  /* Test for the bug of transforming indx >= MININT to indx > MININT-1 */
  public static int test_ge1(int limit) {
    int indx;
    int sum = 0;
    for (indx = 500; indx >= limit; indx -= 2) {
      sum += 2000 / indx;
      result = sum;
    }
    return sum;
  }

  /* Test for the bug of transforming indx <= MAXINT to indx < MAXINT+1 */
  public static int test_le1(int limit) {
    int indx;
    int sum = 0;
    for (indx = -500; indx <= limit; indx += 2)
    {
      sum += 3000 / indx;
      result = sum;
    }
    return sum;
  }

  /* Run with -Xcomp -XX:CompileOnly=wrap1.test1 -XX:MaxInlineSize=1 */
  /* limit reset to ((limit-init+stride-1)/stride)*stride+init */
  /* Calculation may overflow */
  public static volatile int c = 1;
  public static int test_wrap1(int limit)
  {
    int indx;
    int sum = 0;
    for (indx = 0xffffffff; indx < limit; indx += 0x20000000)
    {
      sum += c;
    }
    return sum;
  }

  /* Test for range check elimination with bit flip issue for
     scale*i+offset<limit where offset is not 0 */
  static int[] box5 = {1,2,3,4,5,6,7,8,9};
  public static int test_rce5(int[] b, int limit)
  {
    int indx;
    int sum = b[1];
    result = sum;
    for (indx = 0x80000000; indx < limit; ++indx)
    {
      if (indx > 0x80000000)
      {
        // this test is not issued in pre-loop but issued in main loop
        // trick rce into thinking expression is false when indx >= 0
        // in fact it is false when indx==0x80000001
        if (indx - 9 < -9)
        {
          sum += indx;
          result = sum;
          sum ^= b[indx & 7];
          result = sum;
        }
        else
          break;
      }
      else
      {
        sum += b[indx & 3];
        result = sum;
      }
    }
    return sum;
  }

  /* Test for range check elimination with bit flip issue for
     scale*i<limit where scale > 1 */
  static int[] box6 = {1,2,3,4,5,6,7,8,9};
  public static int test_rce6(int[] b, int limit)
  {
    int indx;
    int sum = b[1];
    result = sum;
    for (indx = 0x80000000; indx < limit; ++indx)
    {
      if (indx > 0x80000000)
      {
        // harmless rce target
        if (indx < 0)
        {
          sum += result;
          result = sum;
        }
        else
          break;
        // this test is not issued in pre-loop but issued in main loop
        // trick rce into thinking expression is false when indx >= 0
        // in fact it is false when indx==0x80000001
        // In compilers that transform mulI to shiftI may mask this issue.
        if (indx * 28 + 1 < 0)
        {
          sum += indx;
          result = sum;
          sum ^= b[indx & 7];
          result = sum;
        }
        else
          break;
      }
      else
      {
        sum += b[indx & 3];
        result = sum;
      }
    }
    return sum;
  }

  /* Test for range check elimination with i <= limit */
  static int[] box7 = {1,2,3,4,5,6,7,8,9,0x7fffffff};
  public static int test_rce7(int[] b)
  {
    int indx;
    int max = b[9];
    int sum = b[7];
    result = sum;
    for (indx = 0; indx < b.length; ++indx)
    {
      if (indx <= max)
      {
        sum += (indx ^ 15) + ((result != 0) ? 0 : sum);
        result = sum;
      }
      else
        throw new RuntimeException();
    }
    for (indx = -7; indx < b.length; ++indx)
    {
      if (indx <= 9)
      {
        sum += (sum ^ 15) + ((result != 0) ? 0 : sum);
        result = sum;
      }
      else
        throw new RuntimeException();
    }
    return sum;
  }

  /* Test for range check elimination with i >= limit */
  static int[] box8 = {-1,0,1,2,3,4,5,6,7,8,0x80000000};
  public static int test_rce8(int[] b)
  {
    int indx;
    int sum = b[5];
    int min = b[10];
    result = sum;
    for (indx = b.length-1; indx >= 0; --indx)
    {
      if (indx >= min)
      {
        sum += (sum ^ 9) + ((result != 0) ? 0 :sum);
        result = sum;
      }
      else
        throw new RuntimeException();
    }
    return sum;
  }

  public static void main(String[] args)
  {
    result=1;
    int r = 0;
    try {
      r = test_ge1(0x80000000);
      System.out.println(result);
      System.out.println("test_ge1 FAILED");
      System.exit(1);
    }
    catch (ArithmeticException e1) {
      System.out.println("test_ge1: Expected exception caught");
      if (result != 5986) {
        System.out.println(result);
        System.out.println("test_ge1 FAILED");
        System.exit(97);
      }
    }
    System.out.println("test_ge1 WORKED");

    result=0;
    try
    {
      r = test_le1(0x7fffffff);
      System.out.println(result);
      System.out.println("test_le1 FAILED");
      System.exit(1);
    }
    catch (ArithmeticException e1)
    {
      System.out.println("test_le1: Expected exception caught");
      if (result != -9039)
      {
        System.out.println(result);
        System.out.println("test_le1 FAILED");
        System.exit(97);
      }
    }
    System.out.println("test_le1 WORKED");

    result=0;
    r = test_wrap1(0x7fffffff);
    if (r != 4)
    {
      System.out.println(result);
      System.out.println("test_wrap1 FAILED");
      System.exit(97);
    }
    else
    {
      System.out.println("test_wrap1 WORKED");
    }

    result=0;
    r = test_rce5(box5,0x80000100);
    if (result != 3)
    {
      System.out.println(result);
      System.out.println("test_rce5 FAILED");
      System.exit(97);
    }
    else
    {
      System.out.println("test_rce5 WORKED");
    }

    result=0;
    r = test_rce6(box6,0x80000100);
    if (result != 6)
    {
      System.out.println(result);
      System.out.println("test_rce6 FAILED");
      System.exit(97);
    }
    else
    {
      System.out.println("test_rce6 WORKED");
    }

    result=0;
    r = test_rce7(box7);
    if (result != 14680079)
    {
      System.out.println(result);
      System.out.println("test_rce7 FAILED");
      System.exit(97);
    }
    else
    {
      System.out.println("test_rce7 WORKED");
    }

    result=0;
    r = test_rce8(box8);
    if (result != 16393)
    {
      System.out.println(result);
      System.out.println("test_rce8 FAILED");
      System.exit(97);
    }
    else
    {
      System.out.println("test_rce8 WORKED");
    }
  }
}

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