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Date: Thu, 24 Apr 2014 12:15:18 +0000 (UTC)
From: "Emmanuel Bourg (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Message-ID: <JIRA.12619186.1049550486000.171567.1398341718398@arcas>
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Subject: [jira] [Updated] (BCEL-20) InstructionList.copy() fails with Select
 instruction.
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     [ https://issues.apache.org/jira/browse/BCEL-20?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Emmanuel Bourg updated BCEL-20:
-------------------------------

         Priority: Major
      Environment:     (was: Operating System: Linux
Platform: All)
    Fix Version/s: 5.2
         Priority:   (was: P3)
         Severity:   (was: normal)

> InstructionList.copy() fails with Select instruction.
> -----------------------------------------------------
>
>                 Key: BCEL-20
>                 URL: https://issues.apache.org/jira/browse/BCEL-20
>             Project: Commons BCEL
>          Issue Type: Bug
>          Components: Main
>    Affects Versions: 5.0
>            Reporter: wombat
>            Assignee: Apache Commons Developers
>             Fix For: 5.2
>
>
> The implementation of InstructionList.copy() works on the internal targets
> fields of the select instructions:
> (InstructionList.java line 1110)
> 	  InstructionHandle[] itargets = ((Select)bi).getTargets();
> 	  InstructionHandle[] ctargets = ((Select)bc).getTargets();
> But because bc is created from bi by cloning bi, both refer to the same target
> array.
> Changing ctargets also changes itargets. 
> The reason for this is, that Select does not override clone. 
> The following patch fixes this problem:
> Index: Select.java
> ===================================================================
> RCS file:
> /home/cvspublic/jakarta-bcel/src/java/org/apache/bcel/generic/Select.java,v
> retrieving revision 1.2
> diff -u -r1.2 Select.java
> --- Select.java 26 Apr 2002 09:30:11 -0000      1.2
> +++ Select.java 5 Apr 2003 13:37:54 -0000
> @@ -227,6 +227,16 @@
>      return false;
>    }
> +  protected Object clone() throws CloneNotSupportedException {
> +      Select result = (Select) super.clone();
> +
> +      result.match   = (int[]) result.match.clone();
> +      result.indices = (int[]) result.indices.clone();
> +      result.targets = (InstructionHandle[]) result.targets.clone();
> +
> +      return result;
> +  }
> +
>    /**
>     * Inform targets that they're not targeted anymore.
>     */


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