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 struct symbol_s
  48 {
  49   /* The key, name of the symbol. */
  50   char *tag;
  51   /* Its type. */
  52   char *type_name;
  53   short number;
  54   short prec;
  55   associativity assoc;
  56   int user_token_number;
  57
  58   /* Points to the other in the identifier-symbol pair for an
  59      alias. Special value SALIAS in the identifier half of the
  60      identifier-symbol pair for an alias.  */
  61   struct symbol_s *alias;
  62   symbol_class class;
  63 };
  64
  65 typedef struct symbol_s symbol_t;
  66
  67 /* A function to apply to each symbol. */
  68 typedef bool (*symbol_processor) PARAMS ((symbol_t *));
  69
  70 symbol_t *getsym PARAMS ((const char *));
  71
  72 void symbols_new PARAMS ((void));
  73 void symbols_do PARAMS ((symbol_processor processor, void *processor_data));
  74 void symbols_free PARAMS ((void));
  75
  76 #endif /* !SYMTAB_H_ */