can you give me some comment on this vector packing in bison?

Changming Xu <xcmhit@gmail.com>
Sat, 20 Mar 2010 18:26:45 +0800

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can you give me some comment on this vector packing in bison? xcmhit@gmail.com (Changming Xu) (2010-03-20)
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From: Changming Xu <xcmhit@gmail.com>
Newsgroups: comp.compilers
Date: Sat, 20 Mar 2010 18:26:45 +0800
Organization: Compilers Central
Keywords: bison, question
Posted-Date: 20 Mar 2010 23:22:48 EDT

hi,
can somebody give me some comment on the following code in bison/byacc






pack_vector:




            for (k = 0; ok && k < vector; k++)
        if (pos[k] == j)
            ok = false;


I believe I understand the pack alg from Aho[1986] and flex. But I
don't understand why it does not work if base[i] == base[j] for some
i,j


(I confirmed it with bash-4.0/parse.y, it does not work if I comment
these lines)








Thanks!!


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