(SALIAS): New #define for adding aliases to %token.

(struct bucket): Added `alias' field.

diff --git a/src/symtab.h b/src/symtab.h
index 9f2cb564c8aeb0c144443c181e118d02ef17594d..f515721d6b546369a6a5eb9de4e873487c80910a 100644 (file)
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,5 +1,5 @@
 /* Definitions for symtab.c and callers, part of bison,
-   Copyright (C) 1984, 1989 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1989, 1992 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
@@ -24,9 +24,10 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 /*  symbol classes  */
 
 #define SUNKNOWN 0
-#define STOKEN  1
-#define SNTERM  2
+#define STOKEN  1      /* terminal symbol */
+#define SNTERM  2      /* non-terminal */
 
+#define SALIAS -9991   /* for symbol generated with an alias */
 
 typedef
   struct bucket
@@ -39,6 +40,11 @@ typedef
       short prec;
       short assoc;
       short user_token_number;
+                       /* special value SALIAS in the identifier
+                        half of the identifier-symbol pair for an alias */
+      struct bucket *alias;      
+                       /* points to the other in the identifier-symbol
+                        pair for an alias */
       char class;
     }
   bucket;