RE: [GNU-COBOL] grammar

[Tim Underwood <TimU@hightouchinc.com>]

> I did a quick comparison between bison, byacc and btyacc, 
> using the same
> input grammar.
> 
> Byacc fared the best(not always, usually), with bison in second. The
> problem with btyacc seems to be that while byacc and bison will output
> errors then stop, btyacc will seg fault and core dump. 
> 
> As to specifically why it as a tendency to that, I do not 
> know. At the time
> I had no wish to track down the problem.
> 

It's got to be a stack problem.  From what I read about btyacc, it starts
"hunting" other possible solutions, probably through recursion.  There isn't
a test to make sure it isn't going too deep.  I have NOT looked at the code,
but it should probably have a counter/check and not go more than <n> levels
deep.  It continues, and chews up the stack, thus causing the seg fault.

BTW, we had some problems here with power, and I seem to have lost the email
someone sent that gave the location of the source, etc.  Could someone
resend this please?

Thanx. 

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