/* Definitions for symtab.c and callers, part of bison,
- Copyright (C) 1984, 1989, 1992 Free Software Foundation, Inc.
+ Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002
+ Free Software Foundation, Inc.
-This file is part of Bison, the GNU Compiler Compiler.
+ This file is part of Bison, the GNU Compiler Compiler.
-Bison is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+ Bison is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
-Bison is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ Bison is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with Bison; see the file COPYING. If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU General Public License
+ along with Bison; see the file COPYING. If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#ifndef SYMTAB_H_
+# define SYMTAB_H_
-#define TABSIZE 1009
+# include "location.h"
+# include "assoc.h"
+/*----------.
+| Symbols. |
+`----------*/
-/* symbol classes */
+/* Symbol classes. */
+typedef enum
+{
+ unknown_sym,
+ token_sym, /* terminal symbol */
+ nterm_sym /* non-terminal */
+} symbol_class;
-#define SUNKNOWN 0
-#define STOKEN 1 /* terminal symbol */
-#define SNTERM 2 /* non-terminal */
-#define SALIAS -9991 /* for symbol generated with an alias */
+/* Internal token numbers. */
+typedef short symbol_number_t;
+#define SYMBOL_NUMBER_MAX ((symbol_number_t) SHRT_MAX)
-typedef
- struct bucket
- {
- struct bucket *link;
- struct bucket *next;
- char *tag;
- char *type_name;
- short value;
- short prec;
- short assoc;
- short user_token_number;
- /* special value SALIAS in the identifier
- half of the identifier-symbol pair for an alias */
- struct bucket *alias;
- /* points to the other in the identifier-symbol
- pair for an alias */
- char class;
- }
- bucket;
+typedef struct symbol_s symbol_t;
+struct symbol_s
+{
+ /* The key, name of the symbol. */
+ char *tag;
+ /* The location of its first occurence. */
+ location_t location;
-extern bucket *firstsymbol;
+ /* Its %type and associated printer and destructor. */
+ char *type_name;
+ char *destructor;
+ location_t destructor_location;
+ char *printer;
+ location_t printer_location;
-extern bucket *getsym PARAMS((const char *));
+ symbol_number_t number;
+ short prec;
+ assoc_t assoc;
+ int user_token_number;
+
+ /* Points to the other in the identifier-symbol pair for an alias.
+ Special value USER_NUMBER_ALIAS in the identifier half of the
+ identifier-symbol pair for an alias. */
+ symbol_t *alias;
+ symbol_class class;
+};
+
+/* Undefined user number. */
+#define USER_NUMBER_UNDEFINED -1
+
+/* `symbol->user_token_number == USER_NUMBER_ALIAS' means this symbol
+ *has* (not is) a string literal alias. For instance, `%token foo
+ "foo"' has `"foo"' numbered regularly, and `foo' numbered as
+ USER_NUMBER_ALIAS. */
+#define USER_NUMBER_ALIAS -9991
+
+/* Undefined internal token number. */
+#define NUMBER_UNDEFINED ((symbol_number_t) -1)
+
+
+/* Fetch (or create) the symbol associated to KEY. */
+symbol_t *symbol_get (const char *key, location_t location);
+
+/* Generate a dummy nonterminal, whose name cannot conflict with the
+ user's names. */
+symbol_t *dummy_symbol_get (location_t location);
+
+/* Declare the new SYMBOL. Make it an alias of SYMVAL. */
+void symbol_make_alias (symbol_t *symbol, symbol_t *symval,
+ location_t location);
+
+/* Set the TYPE_NAME associated to SYMBOL. Does nothing if passed 0 as
+ TYPE_NAME. */
+void symbol_type_set (symbol_t *symbol,
+ char *type_name, location_t location);
+
+/* Set the DESTRUCTOR associated to SYMBOL. */
+void symbol_destructor_set (symbol_t *symbol,
+ char *destructor, location_t location);
+
+/* Set the PRINTER associated to SYMBOL. */
+void symbol_printer_set (symbol_t *symbol,
+ char *printer, location_t location);
+
+/* Set the PRECEDENCE associated to SYMBOL. Ensures that SYMBOL is a
+ terminal. Does nothing if invoked with UNDEF_ASSOC as ASSOC. */
+void symbol_precedence_set (symbol_t *symbol,
+ int prec, assoc_t assoc, location_t location);
+
+/* Set the CLASS associated to SYMBOL. */
+void symbol_class_set (symbol_t *symbol,
+ symbol_class class, location_t location);
+
+/* Set the USER_TOKEN_NUMBER associated to SYMBOL. */
+void symbol_user_token_number_set (symbol_t *symbol,
+ int user_number, location_t location);
+
+
+/* Distinguished symbols. AXIOM is the real start symbol, that used
+ by the automaton. STARTSYMBOL is the one specified by the user.
+ */
+extern symbol_t *errtoken;
+extern symbol_t *undeftoken;
+extern symbol_t *endtoken;
+extern symbol_t *accept;
+extern symbol_t *startsymbol;
+extern location_t startsymbol_location;
+
+
+/*---------------.
+| Symbol table. |
+`---------------*/
+
+
+/* Create the symbol table. */
+void symbols_new (void);
+
+/* A function to apply to each symbol. */
+typedef bool (*symbol_processor) (symbol_t *);
+
+/* Apply PROCESSOR to all the symbols. PROCESSOR must return true: on
+ false, the processing stops. */
+void symbols_do (symbol_processor processor, void *processor_data);
+
+/* Free all the memory allocated for symbols. */
+void symbols_free (void);
+
+/* Check that all the symbols are defined. Report any undefined
+ symbols and consider them nonterminals. */
+void symbols_check_defined (void);
+
+/* Perform various sanity checks, assign symbol numbers, and set up
+ TOKEN_TRANSLATIONS. */
+void symbols_pack (void);
+
+#endif /* !SYMTAB_H_ */
projects / bison.git / blobdiff