X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/75ad86eebd3f49dff81976eb83036eb7b7793e68..9ca7f077a0a5ecdd00c5945c7a7bd3cf46e23c13:/src/lalr.c

diff --git a/src/lalr.c b/src/lalr.c
index f7560552..15213422 100644
--- a/src/lalr.c
+++ b/src/lalr.c
@@ -5,20 +5,18 @@
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   Bison is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
-   Bison is distributed in the hope that it will be useful,
+   This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
 /* Compute how to make the finite state machine deterministic; find
@@ -340,7 +338,6 @@ compute_lookahead_tokens (void)
 static int
 state_lookahead_tokens_count (state *s)
 {
-  int k;
   int n_lookahead_tokens = 0;
   reductions *rp = s->reductions;
   transitions *sp = s->transitions;
@@ -348,21 +345,17 @@ state_lookahead_tokens_count (state *s)
   /* We need a lookahead either to distinguish different
      reductions (i.e., there are two or more), or to distinguish a
      reduction from a shift.  Otherwise, it is straightforward,
-     and the state is `consistent'.  */
+     and the state is `consistent'.  There is no need to check that
+     transition 0 hasn't been disabled before checking if it is a
+     shift since transitions are only disabled during conflict
+     resolution, and that hasn't happened yet.  */
+  aver (sp->num == 0 || !TRANSITION_IS_DISABLED (sp, 0));
   if (rp->num > 1
-      || (rp->num == 1 && sp->num &&
-	  !TRANSITION_IS_DISABLED (sp, 0) && TRANSITION_IS_SHIFT (sp, 0)))
+      || (rp->num == 1 && sp->num && TRANSITION_IS_SHIFT (sp, 0)))
     n_lookahead_tokens += rp->num;
   else
     s->consistent = 1;
 
-  for (k = 0; k < sp->num; k++)
-    if (!TRANSITION_IS_DISABLED (sp, k) && TRANSITION_IS_ERROR (sp, k))
-      {
-	s->consistent = 0;
-	break;
-      }
-
   return n_lookahead_tokens;
 }
 
@@ -459,22 +452,25 @@ lalr_update_state_numbers (state_number old_to_new[], state_number nstates_old)
   goto_number ngotos_reachable = 0;
   symbol_number nonterminal = 0;
   aver (nsyms == nvars + ntokens);
-  for (goto_number i = 0; i < ngotos; ++i)
-    {
-      while (i == goto_map[nonterminal])
-        goto_map[nonterminal++] = ngotos_reachable;
-      /* If old_to_new[from_state[i]] = nstates_old, remove this goto
-         entry.  */
-      if (old_to_new[from_state[i]] != nstates_old)
-        {
-          /* from_state[i] is not removed, so it and thus to_state[i] are
-             reachable, so to_state[i] != nstates_old.  */
-          aver (old_to_new[to_state[i]] != nstates_old);
-          from_state[ngotos_reachable] = old_to_new[from_state[i]];
-          to_state[ngotos_reachable] = old_to_new[to_state[i]];
-          ++ngotos_reachable;
-        }
-    }
+  {
+    goto_number i;
+    for (i = 0; i < ngotos; ++i)
+      {
+        while (i == goto_map[nonterminal])
+          goto_map[nonterminal++] = ngotos_reachable;
+        /* If old_to_new[from_state[i]] = nstates_old, remove this goto
+           entry.  */
+        if (old_to_new[from_state[i]] != nstates_old)
+          {
+            /* from_state[i] is not removed, so it and thus to_state[i] are
+               reachable, so to_state[i] != nstates_old.  */
+            aver (old_to_new[to_state[i]] != nstates_old);
+            from_state[ngotos_reachable] = old_to_new[from_state[i]];
+            to_state[ngotos_reachable] = old_to_new[to_state[i]];
+            ++ngotos_reachable;
+          }
+      }
+  }
   while (nonterminal <= nvars)
     {
       aver (ngotos == goto_map[nonterminal]);