bison/yacc internals question

Achyutram Bhamidipaty <ram@cs.arizona.edu>
Sun, 12 Mar 1995 17:40:11 GMT

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bison/yacc internals question ram@cs.arizona.edu (Achyutram Bhamidipaty) (1995-03-12)
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From: Achyutram Bhamidipaty <ram@cs.arizona.edu>
Keywords: yacc, question
Organization: Compilers Central
Date: Sun, 12 Mar 1995 17:40:11 GMT

I'm working on a project where I need to modify Bison.


I'm having some trouble undertstanding some of the details of how the
look ahead for a given set is computed.


Is there anyone out there that can explain the reltionship between the
LA bit matrix, lookaheads vector, and the notion of a default
reduction?


Specifically if the lookaheads[] entry for some state differ by 1 is
it true that only one bit will be set in the LA matrix that
corresponds to that set?


Thanks for any help.
-Ram
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