src/symtab.h

   1 /* Definitions for symtab.c and callers, part of bison,
   2    Copyright 1984, 1989, 1992, 2000, 2001  Free Software Foundation, Inc.
   3
   4    This file is part of Bison, the GNU Compiler Compiler.
   5
   6    Bison is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    Bison is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with Bison; see the file COPYING.  If not, write to
  18    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef SYMTAB_H_
  22 # define SYMTAB_H_
  23 # include "gram.h"
  24
  25 #define TABSIZE 1009
  26
  27 /*  symbol classes  */
  28
  29 typedef enum
  30 {
  31   unknown_sym,
  32   token_sym,            /* terminal symbol */
  33   nterm_sym             /* non-terminal */
  34 } symbol_class;
  35
  36 #define SUNDEF  -1              /* For undefined user number. */
  37 #define SALIAS  -9991           /* for symbol generated with an alias */
  38
  39 typedef struct bucket
  40 {
  41   /* Needed for the hash table. */
  42   struct bucket *link;
  43   struct bucket *next;
  44
  45   /* The key, name of the symbol. */
  46   char *tag;
  47   /* Its type. */
  48   char *type_name;
  49   short value;
  50   short prec;
  51   associativity assoc;
  52   short user_token_number;
  53
  54   /* Points to the other in the identifier-symbol pair for an
  55      alias. Special value SALIAS in the identifier half of the
  56      identifier-symbol pair for an alias.  */
  57   struct bucket *alias;
  58   symbol_class class;
  59 } bucket;
  60
  61
  62 extern bucket *firstsymbol;
  63
  64 bucket *getsym PARAMS ((const char *));
  65
  66 void tabinit PARAMS ((void));
  67 void free_symtab PARAMS ((void));
  68
  69 #endif /* !SYMTAB_H_ */