Bison dumps core on bash.y.

[bison.git] / src / lalr.c

diff --git a/src/lalr.c b/src/lalr.c
index 09dc7602892ba4e37fba7010a3e7050086d5f3ac..44eaa3edb55e1f116536102b15932f9def6ea203 100644 (file)
--- a/src/lalr.c
+++ b/src/lalr.c
@@ -247,16 +247,17 @@ set_goto_map (void)
 
   ngotos = 0;
   for (sp = first_shift; sp; sp = sp->next)
-    for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
-      {
-       symbol = state_table[sp->shifts[i]].accessing_symbol;
+    if (sp->nshifts)
+      for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
+       {
+         symbol = state_table[sp->shifts[i]].accessing_symbol;
 
-       if (ngotos == MAXSHORT)
-         fatal (_("too many gotos (max %d)"), MAXSHORT);
+         if (ngotos == MAXSHORT)
+           fatal (_("too many gotos (max %d)"), MAXSHORT);
 
-       ngotos++;
-       goto_map[symbol]++;
-      }
+         ngotos++;
+         goto_map[symbol]++;
+       }
 
   k = 0;
   for (i = ntokens; i < nsyms; i++)
@@ -277,15 +278,16 @@ set_goto_map (void)
   for (sp = first_shift; sp; sp = sp->next)
     {
       state1 = sp->number;
-      for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
-       {
-         state2 = sp->shifts[i];
-         symbol = state_table[state2].accessing_symbol;
-
-         k = temp_map[symbol]++;
-         from_state[k] = state1;
-         to_state[k] = state2;
-       }
+      if (sp->nshifts)
+       for (i = sp->nshifts - 1; i >= 0 && SHIFT_IS_GOTO (sp, i); --i)
+         {
+           state2 = sp->shifts[i];
+           symbol = state_table[state2].accessing_symbol;
+
+           k = temp_map[symbol]++;
+           from_state[k] = state1;
+           to_state[k] = state2;
+         }
     }
 
   XFREE (temp_map + ntokens);