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* src/nullable.c (set_nullable): Useless rules must be skipped,

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otherwise, since we range over their symbols, we might look at a
nonterminal which no longer ``exists'', i.e., it is not counted in
`nvars', hence we overflow our arrays.
This commit is contained in:
Akim Demaille
2001-12-15 16:21:44 +00:00
parent 93ede233f5
commit 9c2c67e6fe
2 changed files with 37 additions and 27 deletions
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7
ChangeLog
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@@ -1,3 +1,10 @@
2001-12-15 Akim Demaille <akim@epita.fr>
* src/nullable.c (set_nullable): Useless rules must be skipped,
otherwise, since we range over their symbols, we might look at a
nonterminal which no longer ``exists'', i.e., it is not counted in
`nvars', hence we overflow our arrays.
2001-12-15 Akim Demaille <akim@epita.fr>
The header can also be produced directly, without any obstack!

3
src/nullable.c
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@@ -69,6 +69,8 @@ set_nullable (void)
p = relts;
for (ruleno = 1; ruleno < nrules + 1; ++ruleno)
if (rule_table[ruleno].useful)
{
if (ritem[rule_table[ruleno].rhs] > 0)
{
/* This rule has a non empty RHS. */
@@ -100,6 +102,7 @@ set_nullable (void)
*s2++ = rule_table[ruleno].lhs;
}
}
}
while (s1 < s2)
for (p = rsets[*s1++]; p; p = p->next)