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bug#36740: 27.0.50; apparently buggy code in ccl.c (lookup-integer-const

From: Pip Cet
Subject: bug#36740: 27.0.50; apparently buggy code in ccl.c (lookup-integer-constant)
Date: Sat, 20 Jul 2019 12:29:57 +0000

This code in ccl.c

        eop = hash_lookup (h, make_fixnum (reg[RRR]), NULL);
        if (eop >= 0)
            Lisp_Object opl;
            opl = HASH_VALUE (h, eop);
            if (! (IN_INT_RANGE (eop) && CHARACTERP (opl)))
            reg[RRR] = charset_unicode;
            reg[rrr] = eop;
            reg[7] = 1; /* r7 true for success */
          reg[7] = 0;

seems wrong to me. We look up the hash value for reg[RRR], but then we
store the hash _index_ into reg[rrr], and throw away the actual value.

The bug appears to be present in:

commit d325055a00e658a38c1721fcc63ed1775dd8ccb3
Author: Dave Love <address@hidden>
Date:   Tue Jul 30 11:31:54 2002 +0000

which added the code, so I'm not sure whether there's external code
which might rely on the buggy behavior (unlikely, I think). Is there
any code actually making use of this CCL feature?

I'm playing around with hash tables and it would help to resolve this first.

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