src/symtab.h

   1 /* Definitions for symtab.c and callers, part of bison,
   2    Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    Bison is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    Bison is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bison; see the file COPYING.  If not, write to
  19    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef SYMTAB_H_
  23 # define SYMTAB_H_
  24
  25 #define TABSIZE 1009
  26
  27 /* Associativity values for tokens and rules.  */
  28 typedef enum
  29 {
  30   right_assoc,
  31   left_assoc,
  32   non_assoc
  33 } associativity;
  34
  35
  36 /* Symbol classes.  */
  37 typedef enum
  38 {
  39   unknown_sym,
  40   token_sym,            /* terminal symbol */
  41   nterm_sym             /* non-terminal */
  42 } symbol_class;
  43
  44 #define SUNDEF  -1              /* For undefined user number. */
  45 #define SALIAS  -9991           /* for symbol generated with an alias */
  46
  47 typedef struct bucket
  48 {
  49   /* Needed for the hash table. */
  50   struct bucket *link;
  51   struct bucket *next;
  52
  53   /* The key, name of the symbol. */
  54   char *tag;
  55   /* Its type. */
  56   char *type_name;
  57   short number;
  58   short prec;
  59   associativity assoc;
  60   short user_token_number;
  61
  62   /* Points to the other in the identifier-symbol pair for an
  63      alias. Special value SALIAS in the identifier half of the
  64      identifier-symbol pair for an alias.  */
  65   struct bucket *alias;
  66   symbol_class class;
  67 } bucket;
  68
  69
  70 extern bucket *firstsymbol;
  71
  72 bucket *getsym PARAMS ((const char *));
  73
  74 void tabinit PARAMS ((void));
  75 void free_symtab PARAMS ((void));
  76
  77 #endif /* !SYMTAB_H_ */