src/symtab.h

   1 /* Definitions for symtab.c and callers, part of bison,
   2    Copyright 1984, 1989, 1992, 2000, 2001, 2002  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
  24 #define TABSIZE 1009
  25
  26 /* Associativity values for tokens and rules.  */
  27 typedef enum
  28 {
  29   right_assoc,
  30   left_assoc,
  31   non_assoc
  32 } associativity;
  33
  34
  35 /* Symbol classes.  */
  36 typedef enum
  37 {
  38   unknown_sym,
  39   token_sym,            /* terminal symbol */
  40   nterm_sym             /* non-terminal */
  41 } symbol_class;
  42
  43 #define SUNDEF  -1              /* For undefined user number. */
  44 #define SALIAS  -9991           /* for symbol generated with an alias */
  45
  46 typedef struct bucket
  47 {
  48   /* Needed for the hash table. */
  49   struct bucket *link;
  50   struct bucket *next;
  51
  52   /* The key, name of the symbol. */
  53   char *tag;
  54   /* Its type. */
  55   char *type_name;
  56   short number;
  57   short prec;
  58   associativity assoc;
  59   short user_token_number;
  60
  61   /* Points to the other in the identifier-symbol pair for an
  62      alias. Special value SALIAS in the identifier half of the
  63      identifier-symbol pair for an alias.  */
  64   struct bucket *alias;
  65   symbol_class class;
  66 } bucket;
  67
  68
  69 extern bucket *firstsymbol;
  70
  71 bucket *getsym PARAMS ((const char *));
  72
  73 void tabinit PARAMS ((void));
  74 void free_symtab PARAMS ((void));
  75
  76 #endif /* !SYMTAB_H_ */