lex bug/feature

lex bug/feature

Post by Jay Sco » Fri, 24 Oct 1997 04:00:00

>Hi, I'm trying to port some lex source from UTS (amdahl unix variant) to
>Solaris and something that compiled fine stops working. The details are:
>$ uname -a
>SunOS gandalf 5.5.1 Generic_103640-08 sun4u sparc SUNW,Ultra-1
>$ lex -V
>lex: Software Generation Utilities (SGU) SunOS/ELF (LK-2.0 (S/I) -
>^C$ lex exprlex.l
>"exprlex.l":line 83: Error: Definitions too long
>0/1000 nodes(%e), 0/10000 positions(%p), 1/500 (%n), 0 transitions,
>0/10000 packed char classes(%k), 0/20000 packed transitions(%a), 0/32000
>output slots(%o)

>The lex file works fine when I cut it down to 43 definitions (from 200+) -
>does anyone have an idea what's going on? Am I missing some flag or
>something or should I try the gnu lex.

look at the lex man page.  lex takes arguments to expand the size
of some arrays.  it looks a bit like you may have exceeded the limit.

or get flex, the gnu lex.  i like it a lot better.  for a start, it
has exclusive start states.  most of my lexical stuff works ok with
either, but when i need a big hammer, i use flex.

Jay Scott               512-835-3553

Applied Research Labs, Computer Science Div.
University of Texas at Austin


1. Lex/Yacc Recursive Background Bugs?

Is there any odd behaviour known with putting recursive Lex/Yacc
routines in background on Linux machines?

We have a lex/yacc routine that opens include files for parsing.
Within the include files, it will open other include files
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in background, the parsing fails. It almost looks like variables are
static through the recursion.

Is this a known problem, or is Redhat just more strict with something
that I was getting away with previously?

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