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From "Alexei Fedotov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5764) [drlvm][verifier-ext] Incorrect stack map calculation
Date Wed, 30 Apr 2008 14:59:55 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593351#action_12593351

Alexei Fedotov commented on HARMONY-5764:

The problem is that modifications of local variables in the middle of exception range are
not correctly reflected in the generated stack map.

I have noticed that the exception handler entry point contains only one incoming instruction
(el->firstIncoming()->nxt == NULL) . Could it mean that you don't merge data flow from
each instruction from the exception range to the exception handler entry point? I hope the
answer is "no" because implementing merge of data flow from any instruction in the exception
handler would seriously slow Mikhail's verifier.

> [drlvm][verifier-ext] Incorrect stack map calculation 
> ------------------------------------------------------
>                 Key: HARMONY-5764
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5764
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Win32
>            Reporter: vasily.v.levchenko@gmail.com
>         Attachments: CGProxy.class, java2d.demos.Images.JPEGFlip , java2d.demos.Images.JPEGFlip.javap,
JPEGFlip.class , ver-ext-dbg.patch
> Incorrect stack map calculation was detected in revision supposed to be M5.5_Eclipse_TPTP

> Exception in thread "main" java.lang.VerifyError: Stack map does not match the one at
exception handler 404 in method java2d.demos.Images.JPEGFlip.render(IILjava/awt/Graphics2D;)V
at offset 399

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