maint: more syntax-checks

[bison.git] / src / nullable.c

diff --git a/src/nullable.c b/src/nullable.c
index ef65ef46af481826b19ab90c4614b1c11551b562..b3769fe4c96b5687e82995420a32300a82a73aec 100644 (file)
--- a/src/nullable.c
+++ b/src/nullable.c
@@ -1,24 +1,22 @@
 /* Calculate which nonterminals can expand into the null string for Bison.
 
-   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2003, 2004, 2005 Free
-   Software Foundation, Inc.
+   Copyright (C) 1984, 1989, 2000-2006, 2009-2012 Free Software
+   Foundation, Inc.
 
    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/>.  */
 
 
 /* Set up NULLABLE, a vector saying which nonterminals can expand into
@@ -49,8 +47,8 @@ nullable_print (FILE *out)
   int i;
   fputs ("NULLABLE\n", out);
   for (i = ntokens; i < nsyms; i++)
-    fprintf (out, "\t%s: %s\n", symbols[i]->tag,
-            nullable[i - ntokens] ? "yes" : "no");
+    fprintf (out, "  %s: %s\n", symbols[i]->tag,
+             nullable[i - ntokens] ? "yes" : "no");
   fputs ("\n\n", out);
 }
 
@@ -79,52 +77,52 @@ nullable_compute (void)
   for (ruleno = 0; ruleno < nrules; ++ruleno)
     if (rules[ruleno].useful)
       {
-       rule *rules_ruleno = &rules[ruleno];
-       if (rules_ruleno->rhs[0] >= 0)
-         {
-           /* This rule has a non empty RHS. */
-           item_number *rp = NULL;
-           bool any_tokens = false;
-           for (rp = rules_ruleno->rhs; *rp >= 0; ++rp)
-             if (ISTOKEN (*rp))
-               any_tokens = true;
-
-           /* This rule has only nonterminals: schedule it for the second
-              pass.  */
-           if (!any_tokens)
-             for (rp = rules_ruleno->rhs; *rp >= 0; ++rp)
-               {
-                 rcount[ruleno]++;
-                 p->next = rsets[*rp - ntokens];
-                 p->value = rules_ruleno;
-                 rsets[*rp - ntokens] = p;
-                 p++;
-               }
-         }
-       else
-         {
-           /* This rule has an empty RHS. */
-           if (item_number_as_rule_number (rules_ruleno->rhs[0]) != ruleno)
-             abort ();
-           if (rules_ruleno->useful
-               && ! nullable[rules_ruleno->lhs->number - ntokens])
-             {
-               nullable[rules_ruleno->lhs->number - ntokens] = true;
-               *s2++ = rules_ruleno->lhs->number;
-             }
-         }
+        rule *rules_ruleno = &rules[ruleno];
+        if (rules_ruleno->rhs[0] >= 0)
+          {
+            /* This rule has a non empty RHS. */
+            item_number *rp = NULL;
+            bool any_tokens = false;
+            for (rp = rules_ruleno->rhs; *rp >= 0; ++rp)
+              if (ISTOKEN (*rp))
+                any_tokens = true;
+
+            /* This rule has only nonterminals: schedule it for the second
+               pass.  */
+            if (!any_tokens)
+              for (rp = rules_ruleno->rhs; *rp >= 0; ++rp)
+                {
+                  rcount[ruleno]++;
+                  p->next = rsets[*rp - ntokens];
+                  p->value = rules_ruleno;
+                  rsets[*rp - ntokens] = p;
+                  p++;
+                }
+          }
+        else
+          {
+            /* This rule has an empty RHS. */
+            aver (item_number_as_rule_number (rules_ruleno->rhs[0])
+                  == ruleno);
+            if (rules_ruleno->useful
+                && ! nullable[rules_ruleno->lhs->number - ntokens])
+              {
+                nullable[rules_ruleno->lhs->number - ntokens] = true;
+                *s2++ = rules_ruleno->lhs->number;
+              }
+          }
       }
 
   while (s1 < s2)
     for (p = rsets[*s1++ - ntokens]; p; p = p->next)
       {
-       rule *r = p->value;
-       if (--rcount[r->number] == 0)
-         if (r->useful && ! nullable[r->lhs->number - ntokens])
-           {
-             nullable[r->lhs->number - ntokens] = true;
-             *s2++ = r->lhs->number;
-           }
+        rule *r = p->value;
+        if (--rcount[r->number] == 0)
+          if (r->useful && ! nullable[r->lhs->number - ntokens])
+            {
+              nullable[r->lhs->number - ntokens] = true;
+              *s2++ = r->lhs->number;
+            }
       }
 
   free (squeue);