Re: Bottom-up versus Top-down

"Rodney M. Bates" <rod.bates@wichita.boeing.com>
2 Dec 1997 12:07:05 -0500

          From comp.compilers
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[5 later articles]
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From: "Rodney M. Bates" <rod.bates@wichita.boeing.com>
Newsgroups: comp.compilers
Date: 2 Dec 1997 12:07:05 -0500
Organization: The Boeing Company
References: 97-11-123 97-11-155 97-11-178
Keywords: parse, LALR

Mark K. Gardner wrote:
> One of the justifications often given is that bottom-up parsers are
> table-driven while top-down parsers are usually implemented as
> recursive-descent parsers. However (and as pointed out in the Dragon
> book), top-down parsers can also be table-driven.


LALR parsers can also be implemented in a recursive-descent-like
fashion. I saw this presented in a paper in the late 80's at one of
the SIGPLAN conferences by, as I recall, Penello and DeRemer. The
LALR Generator produced a set of hard coded, recursive routines each
of which was a little state machine.


Or maybe the stack was explicit and it was one hard coded stack
machine. I believe a good implementation required goto's.


Rodney Bates
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