Re: Problem adding cloned instructions

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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