Re: Re: Problem adding cloned instructions

Hi tronje,

Thanks for your reply. What i find so confusing is that i have no  
problems when i use the tree api and create labels directly. But when  
these instructions are automatically created using cloning, i get the  
npe. So something is happening behind the screens and i would like to  
know what that is.



On 7 nov 2009, at 11:35, Tronje Krop <[email protected]>  
wrote:

> Hi Peter,
>
>> I'm encountering a problem (npe) while writing a class using the
>> classwriter with compute_frames option.
>>
>> What i'm doing is rewriting a method by inserting cloned instructions
>> where labels and labelnodes are also completely cloned (so no
>> sharing). The big problem is that classwriter executed the visitmaxs
>> and this relies  on the frame of the cloned label and this frame is
>> null, so causing an npe
>>
>> So appearently i'm doing something wrong. Are there any special rules
>> how to clone a label / labelnode?
>
> I think you should try CheckClassAdapter in your rewriting pass
> to verify whether your produced bytecode is correct. That at least
> was the hint helped me last time getting an NPE in ClassWriter.
>
> I actually included the CheckClassAdapter in every debugging run
> afterwards when running in develop-mode to have more verbose output
> of errors. If this does not help to catch the error you should re-
> visit the code by TraceClassVisitor. Last time debugging, I had the
> feeling CheckClassAdapter does not catch every problem adequately,
> but may although have been my problem.
>
> CU Tronje
>
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