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Re: ver 1.50 crashes

From: Akim Demaille
Subject: Re: ver 1.50 crashes
Date: 14 Oct 2002 12:10:50 +0200
User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Honest Recruiter)

| | Hi,
| | I was messing around with bison-1.50 and the following program causes
| | it to crash.  I tried reducing this program and I can't without
| | removing whatever causes it to crash.  Example: removing the BINOP
| | token, which isn't used or simplifying most other rules. If there's a
| | better place to send this please let me know.
| How bizarre... I don't observe this myself.  What is your
| architecture?  By any chance, is it a 64 bit platform?  Bison is known
| to have problems there, and it was fixed since then: that will be
| 1.51.
| Are there any special options you passed?
| /tmp % bison gram.y --report=all                                  nostromo 
| gram.y: AVERTISSEMENT: 21 conflits par décalage/réduction et 16 conflits par 
| If ever your architecture is not 64 bits, I'm interested in the traces
| of `bison --trace=all gram.y'.  Thanks!
| PS/  Please, report bugs to bug-bison, not help.

Please, keep the CC onto the list!

Well, I have it, and I must say the bug is amazing...  I think that if
you apply the following patch, everything will be OK.

~/src/bison % diff -u src/tables.c.orig src/tables.c -u10         nostromo Err 1
--- src/tables.c.orig   2002-10-14 12:08:34.000000000 +0200
+++ src/tables.c        2002-10-14 12:05:21.000000000 +0200
@@ -773,21 +773,21 @@
 static base_t
 table_ninf_remap (base_t tab[], size_t size, base_t ninf)
   base_t res = 0;
   size_t i;
   for (i = 0; i < size; i++)
     if (tab[i] < res && tab[i] != ninf)
-      res = base[i];
+      res = tab[i];
   for (i = 0; i < size; i++)
     if (tab[i] == ninf)
       tab[i] = res;
   return res;

I'm astonished that no other grammar fell onto that problem.  I'm also
surprised I never noticed: it means some of the YY*_NINF guys don't
fall into the proper range.

Can I use your grammar as test case please?  What is its license?

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