* src/getargs.c (usage): Back out yesterday's modification of the

[bison.git] / src / lalr.c

diff --git a/src/lalr.c b/src/lalr.c
index 8627f1cbc3c5596130ba78c7f1469b8158ead285..65c55ab7c8807ac826cd0fdcb2493ad070eb1196 100644 (file)
--- a/src/lalr.c
+++ b/src/lalr.c
@@ -1,7 +1,7 @@
 /* Compute look-ahead criteria for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002, 2003, 2004
-   Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002, 2003, 2004, 2005,
+   2006 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -25,6 +25,7 @@
    which rules need look-ahead in each state, and which look-ahead
    tokens they accept.  */
 
+#include <config.h>
 #include "system.h"
 
 #include <bitset.h>
@@ -93,8 +94,7 @@ set_goto_map (void)
          ngotos++;
 
          /* Abort if (ngotos + 1) would overflow.  */
-         if (ngotos == GOTO_NUMBER_MAXIMUM)
-           abort ();
+         assert (ngotos != GOTO_NUMBER_MAXIMUM);
 
          goto_map[TRANSITION_SYMBOL (sp, i) - ntokens]++;
        }
@@ -153,8 +153,7 @@ map_goto (state_number s0, symbol_number sym)
 
   for (;;)
     {
-      if (high < low)
-       abort ();
+      assert (low <= high);
       middle = (low + high) / 2;
       s = from_state[middle];
       if (s == s0)
@@ -246,11 +245,11 @@ build_relations (void)
        {
          bool done;
          int length = 1;
-         item_number *rp;
+         item_number const *rp;
          state *s = states[from_state[i]];
          states1[0] = s->number;
 
-         for (rp = (*rulep)->rhs; *rp >= 0; rp++)
+         for (rp = (*rulep)->rhs; ! item_number_is_rule_number (*rp); rp++)
            {
              s = transitions_to (s->transitions,
                                  item_number_as_symbol_number (*rp));
@@ -265,9 +264,11 @@ build_relations (void)
          while (!done)
            {
              done = true;
+             /* Each rhs ends in an item number, and there is a
+                sentinel before the first rhs, so it is safe to
+                decrement RP here.  */
              rp--;
-             /* JF added rp>=ritem &&   I hope to god its right! */
-             if (rp >= ritem && ISVAR (*rp))
+             if (ISVAR (*rp))
                {
                  /* Downcasting from item_number to symbol_number.  */
                  edge[nedges++] = map_goto (states1[--length],