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 /* Internal token numbers. */
  45 typedef short token_number_t;
  46
  47 #define SUNDEF  -1              /* For undefined user number. */
  48 #define SALIAS  -9991           /* for symbol generated with an alias */
  49
  50 #define NUMBER_UNDEFINED ((token_number_t) -1)
  51
  52 struct symbol_s
  53 {
  54   /* The key, name of the symbol. */
  55   char *tag;
  56   /* Its type. */
  57   char *type_name;
  58
  59   token_number_t number;
  60   short prec;
  61   associativity assoc;
  62   int user_token_number;
  63
  64   /* Points to the other in the identifier-symbol pair for an
  65      alias. Special value SALIAS in the identifier half of the
  66      identifier-symbol pair for an alias.  */
  67   struct symbol_s *alias;
  68   symbol_class class;
  69 };
  70
  71 typedef struct symbol_s symbol_t;
  72
  73 /* A function to apply to each symbol. */
  74 typedef bool (*symbol_processor) PARAMS ((symbol_t *));
  75
  76 symbol_t *getsym PARAMS ((const char *));
  77
  78 void symbols_new PARAMS ((void));
  79 void symbols_do PARAMS ((symbol_processor processor, void *processor_data));
  80 void symbols_free PARAMS ((void));
  81
  82 #endif /* !SYMTAB_H_ */