Re: [9fans] How to generate a "debuggable" lex.yy.c?

[Charles Forsyth <charles.forsyth@gmail.com>]

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Perhaps add a copy of allprint, without the character counting, to replace
the existing extern declaration in your ncform, still #ifdef'd with
LEXDEBUG.
The signature of allprint should also be static void allprint(Uchar) and
the exotic initial lines of sub1.c's allprint can be removed.
It needs a #include <ctype.h> inside the #ifdef to get isprint.

Originally on Unix there was a separate little lex library with its own
version of allprint.

On Wed, 10 Nov 2021 at 19:28, gomfy via 9fans <9fans@9fans.net> wrote:

>
> Hello,
>
>
> I would like to generate a lexer with debug functionality. I'm relying on
> a slightly modified versions of the sources:
> https://9fans.github.io/plan9port/man/man3/bio.html
>
> https://9fans.github.io/plan9port/man/man1/yacc.html
>
> https://9fans.github.io/plan9port/man/man1/lex.html
>
>
>
> As far as I can tell, my issues are not related to the fact that I'm
> working with a slightly modified version, but I thought I'll mention it
> just to be on the safe side.
>
>
> The first issue was that the debug information collected in fdebug was
> not flushed and as a result the *y.debug* file for the lexer kept showing
> up empty. I had to add Bterm(fdebug); at the end of the main() in *yacc.c*
> to get the *y.debug* file to be generated with content.
>
>
> Now, my issue is that if I'm compiling the generated *lex.yy.c* with
> -DLEXDEBUG I get:
>
> undefined reference to `allprint(char)'
>
> because of sections like the one below:
>
>
>
> # ifdef LEXDEBUG
>             if(debug){
>                 fprintf(yyout,"char ");
>                 allprint(yych);
>                 putchar('\n');
>                 }
> # endif
>
>
>
> The allprint() function is defined in the Lex source *sub1.c*.  It seems
> I'd have to link against the Lex source to be able to compile *lex.yy.c*
> in debug mode, which would be a bit complicated as there are some clashes
> with my other application. Other complications are caused by the global
> variables that show up in allprint() and other functions that are listed
> in the DEBUG section of *sub1.c*.
>
>
> Can someone point me in the right direction, or tell me what am I missing
> here?
>
>
>
> Thanks!
> Gyorgy
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