grammar: warn about unused precedence for symbols

[bison.git] / src / derives.h

diff --git a/src/derives.h b/src/derives.h
index d9505abaea6577f1475fabed02e83dbb3761b85e..ea8dff7231cbb079ac3d3b7a752f8e39c9ead4ee 100644 (file)
--- a/src/derives.h
+++ b/src/derives.h
@@ -1,28 +1,35 @@
 /* Match rules with nonterminals for bison,
-   Copyright (C) 1984, 1989, 2000 Free Software Foundation, Inc.
+
+   Copyright (C) 1984, 1989, 2000-2002, 2009-2013 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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef DERIVES_H_
+# define DERIVES_H_
+
+# include "gram.h"
+
+/* DERIVES[SYMBOL - NTOKENS] points to a vector of the rules that
+   SYMBOL derives, terminated with NULL.  */
+extern rule ***derives;
 
+/* Compute DERIVES.  */
 
-/* set_derives finds, for each variable (nonterminal), which rules can
-   derive it.  It sets up the value of derives so that derives[i -
-   ntokens] points to a vector of rule numbers, terminated with -1.
-   */
+void derives_compute (void);
+void derives_free (void);
 
-void set_derives PARAMS((void));
-void free_derives PARAMS((void));
+#endif /* !DERIVES_H_ */