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From Gregory Shimansky <gshiman...@gmail.com>
Subject Re: [drlvm] crash handling
Date Thu, 27 Jul 2006 17:41:26 GMT
On Thursday 27 July 2006 20:47 Anton Luht wrote:
> Hello,
>
> I've been trying to nail down a small problem - new
> java.util.zip.Deflater().setDictionary(new byte[] {}) throws
> ArrayIndexOutOfBoundsException in Harmony and doesn't throw in RI.
> Trying to find a code that causes this problem I've modified native
> code and after one of modifications VM crashed, but not with usual
> stacktrace but with popup window (I did it on Windows) that offered to
> debug my application.
>
> I fully understand that it was my fault, etc, but I believe that
> Harmony code is not 100% error-free and such errors in native code may
> happen. Maybe it's worth to catch such errors and wrap them into
> regular Exceptions or at least print stacktrace to the console.

There is an undocumented drlvm property vm.assert_dialog which controls this 
crash popup window on windows. By default this property is true, and you 
indeed get a debug window when VM or Java native code crash. It is very 
convenient for debugging because it allows attaching a debugger (if it is 
installed in your system) right at the crash or failed assert point. To show 
the stack trace instead you can specify -Dvm.assert_dialog=false to run the 
program, it should try to dump some stack though I don't think it works for 
native Java code at the moment. I think crash handler needs improvement in 
this regard.

Whether or not the default of vm.assert_dialog should be true of false is the 
same argument about whether debug or release mode should be the default. I 
think it was agreed that debug should be default so far to make it convenient 
for developers.

For you case I think it is preferable to crash window enabled since that is 
what you want - debug the native code at crash point. To do it you should 
just compile that native code with debug information and copy pdb file to 
java executable directory.

-- 
Gregory Shimansky, Intel Middleware Products Division

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