Mailing-List: contact commits-help@harmony.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@harmony.apache.org
Message-ID: <16727567.1164727763372.JavaMail.jira@brutus>
Date: Tue, 28 Nov 2006 07:29:23 -0800 (PST)
From: "Gregory Shimansky (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Updated: (HARMONY-2144) [drlvm][jit][opt] ABCD causes
 unexpected NullPointerException instead of ArrayIndexOutOfBoundsException
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

     [ http://issues.apache.org/jira/browse/HARMONY-2144?page=all ]

Gregory Shimansky updated HARMONY-2144:
---------------------------------------

    Summary: [drlvm][jit][opt] ABCD causes unexpected NullPointerException instead of ArrayIndexOutOfBoundsException  (was: [drlvm] [jit] [opt] ABCD causes unexpected NullPointerException instead of ArrayIndexOutOfBoundsException)

> [drlvm][jit][opt] ABCD causes unexpected NullPointerException instead of ArrayIndexOutOfBoundsException
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-2144
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2144
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Any
>            Reporter: Elena Sayapina
>         Attachments: abcdTest2.java
>
>
> ABCD causes unexpected NullPointerException instead of ArrayIndexOutOfBoundsException.
> Consider that index of array element called inside a loop depends on the loop control variable.
> An overflow occurs on some loop iteration and corrupts the value of loop control variable so that it became negative.
> An array tries to be accessed with an illegal negative index.
> ArrayIndexOutOfBoundsException should be thrown in this case, but if abcd pass is turned on it causes unexpected NullPointerException.
> Please, see the code example below.
> Code for reproducing:
> public class abcdTest2 {
>     private final int limit = 10000;
>     public static void main(String[] args) {
>         System.exit(new abcdTest2().test());
>     }
>     public int test() {
>         System.out.println("Start abcdTest2 ...");
>         int arr[] = new int[limit];
>         int j=1;
>         try {
>             for(int k=2; k<limit; k=1+k+k*j) {
>                 if (k<0) System.out.println("---Overflow---");
>                 System.out.println("k=" + k + ": arr[" + (k-2) + "] will be called");
>                 arr[k] = arr[k-2];
>                 j = k*k;
>              }
>          } catch (ArrayIndexOutOfBoundsException e) {
>              System.out.println("TEST PASSED ArrayIndexOutOfBoundsException was thrown");
>              return 0;
>          } catch (Exception e) {
>              e.printStackTrace();
>              System.out.println("TEST FAILED: unexpected exeption was thrown");
>              return 1;
>          }
>          System.out.println("TEST FAILED: ArrayIndexOutOfBoundsException wasn't thrown");
>          return 1;
>     }
> }
> Steps to Reproduce:
> Compile abcdTest2 class and run it on Harmony with '-Xem:server_static' option.
> Output on Windows:
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its licensors,
> as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r473012, (Nov 10 2006), Windows/ia32/msvc 1310, release build
> http://incubator.apache.org/harmony
> Start abcdTest2 ...
> k=2: arr[0] will be called
> k=11: arr[9] will be called
> k=1343: arr[1341] will be called
> ---Overflow---
> k=-1872665345: arr[-1872665347] will be called
> java.lang.NullPointerException
>         at abcdTest2.test(abcdTest2.java)
>         at abcdTest2.main(abcdTest2.java:6)
> TEST FAILED: unexpected exception was thrown
> Output on Linux:
> x_ia32_0002_icc_r_H/bin/java -showversion -Xem:server_static abcdTest2                                                                 
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its licensors, as applicable.
> java version "1.5.0" 
> pre-alpha : not complete or compatible
> svn = r473012, (Nov 10 2006), Linux/ia32/icc 900, release build
> http://incubator.apache.org/harmony
> Start abcdTest2 ...
> k=2: arr[0] will be called
> k=11: arr[9] will be called
> k=1343: arr[1341] will be called
> ---Overflow---
> k=-1872665345: arr[-1872665347] will be called
> java.lang.NullPointerException
>         at abcdTest2.test(abcdTest2.java)
>         at abcdTest2.main(abcdTest2.java:6)
> TEST FAILED: unexpected exception was thrown
> Output on RI:
> Start abcdTest2 ...
> k=2: arr[0] will be called
> k=11: arr[9] will be called
> k=1343: arr[1341] will be called
> ---Overflow---
> k=-1872665345: arr[-1872665347] will be called
> TEST PASSED ArrayIndexOutOfBoundsException was thrown

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira