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[Tinycc-devel] Macro substitution woes

From: Peter \"Firefly\" Lund
Subject: [Tinycc-devel] Macro substitution woes
Date: Fri, 7 Mar 2003 02:48:45 +0100 (MET)

I haven't written any code yet to dump the symbol tables.  Instead I read
the code -- it builds even more character than writing debug code.

/* return next token with macro substitution */
static void next(void)
    Sym *nested_list, *s;
    TokenString str;

    if (!macro_ptr) {
        /* if not reading from macro substituted string, then try
           to substitute macros */

this is what goes wrong with the short program I posted a couple of hours
ago (originally discovered by Philippe Ribet).

We probably don't want anything like this to loop:

#define a b
#define b a


I'll have to think about what the proper patch would be -- and also look
at the (draft) ISO C99 spec.  Sigh.


PS: I like your "token string" thing for macro expansion, Fabrice :)
    Wish I had thought of that.  Would you mind a lot if I renamed some of
    the functions, though, to make it clear which ones use a CValue and
    which don't?

"Of course, I'm not unbiased, but in my humble opinion, I've
 gotten close to something that I can be really proud of."
 -- Knuth on The Art of Computer Programming.

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