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Right recursion with ocamlyacc
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Date: 2005-02-16 (02:09)
From: Jon Harrop <jon@j...>
Subject: Right recursion with ocamlyacc

I've just been converting a new Computer Language Shootout submission from 
OCaml to C++ and found that bison falls over very easily with right recursion 
(failing to load a 10^4-element list) but ocamlyacc had no problems (even on 
a 10^5-element list).

Now, I don't know much about yacc internals but I'm curious as to why this 
would be. Does g++ simply consume much bigger stack frames as it recurses 
(>10x the size?) running out much earler, or is there another reason?

Also, assuming this corresponds to non-tail-recursion inside ocamlyacc, could 
a rewrite in CPS eliminate this problem (probably with a performance hit)?

Or am I completely deluded and, in fact, this is a whole-other stack they're 
talking about, and ocamlyacc just happens to allocate a bigger one.

Dr Jon D Harrop, Flying Frog Consultancy Ltd.