X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/984a8a8a40e2a9c4df11ee5e2b3bddfc8abdba8b..c70fdfcd207a394121c7dac271bbd04ce2a91c98:/src/symtab.h?ds=sidebyside

diff --git a/src/symtab.h b/src/symtab.h
index f515721d..61caa539 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,56 +1,158 @@
-/* Definitions for symtab.c and callers, part of bison,
-   Copyright (C) 1984, 1989, 1992 Free Software Foundation, Inc.
+/* Definitions for symtab.c and callers, part of Bison.
 
-This file is part of Bison, the GNU Compiler Compiler.
+   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005
+   Free Software Foundation, Inc.
 
-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.
+   This file is part of Bison, the GNU Compiler Compiler.
 
-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 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.
 
-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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+   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., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
 
-#define	TABSIZE	1009
+#ifndef SYMTAB_H_
+# define SYMTAB_H_
 
+# include "assoc.h"
+# include "location.h"
+# include "uniqstr.h"
 
-/*  symbol classes  */
+/*----------.
+| Symbols.  |
+`----------*/
 
-#define SUNKNOWN 0
-#define STOKEN	 1	/* terminal symbol */
-#define SNTERM	 2	/* non-terminal */
+/* Symbol classes.  */
+typedef enum
+{
+  unknown_sym,
+  token_sym,		/* terminal symbol */
+  nterm_sym		/* non-terminal */
+} symbol_class;
 
-#define SALIAS	-9991	/* for symbol generated with an alias */
 
-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;
+/* Internal token numbers. */
+typedef int symbol_number;
+#define SYMBOL_NUMBER_MAXIMUM INT_MAX
 
 
-extern bucket **symtab;
-extern bucket *firstsymbol;
+typedef struct symbol symbol;
 
-extern bucket *getsym();
+/* When extending this structure, be sure to complete
+   symbol_check_alias_consistency.  */
+struct symbol
+{
+  /* The key, name of the symbol.  */
+  uniqstr tag;
+  /* The location of its first occurrence.  */
+  location location;
+
+  /* Its %type and associated printer and destructor.  */
+  uniqstr type_name;
+  location type_location;
+
+  char *destructor;
+  location destructor_location;
+
+  char *printer;
+  location printer_location;
+
+  symbol_number number;
+  location prec_location;
+  int prec;
+  assoc 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 *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 (-1)
+
+/* Print a symbol (for debugging). */
+void symbol_print (symbol *s, FILE *f);
+
+/* Fetch (or create) the symbol associated to KEY.  */
+symbol *symbol_get (const char *key, location loc);
+
+/* Generate a dummy nonterminal, whose name cannot conflict with the
+   user's names.  */
+symbol *dummy_symbol_get (location loc);
+
+/* Declare the new symbol SYM.  Make it an alias of SYMVAL.  */
+void symbol_make_alias (symbol *sym, symbol *symval, location loc);
+
+/* Set the TYPE_NAME associated with SYM.  Do nothing if passed 0 as
+   TYPE_NAME.  */
+void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
+
+/* Set the DESTRUCTOR associated with SYM.  */
+void symbol_destructor_set (symbol *sym, char *destructor, location loc);
+
+/* Set the PRINTER associated with SYM.  */
+void symbol_printer_set (symbol *sym, char *printer, location loc);
+
+/* Set the PRECEDENCE associated with SYM.  Ensure that SYMBOL is a
+   terminal.  Do nothing if invoked with UNDEF_ASSOC as ASSOC.  */
+void symbol_precedence_set (symbol *sym, int prec, assoc a, location loc);
+
+/* Set the CLASS associated with SYM.  */
+void symbol_class_set (symbol *sym, symbol_class class, location loc);
+
+/* Set the USER_TOKEN_NUMBER associated with SYM.  */
+void symbol_user_token_number_set (symbol *sym, int user_number, location loc);
+
+
+/* Distinguished symbols.  AXIOM is the real start symbol, that used
+   by the automaton.  STARTSYMBOL is the one specified by the user.
+   */
+extern symbol *errtoken;
+extern symbol *undeftoken;
+extern symbol *endtoken;
+extern symbol *accept;
+extern symbol *startsymbol;
+extern location startsymbol_location;
+
+
+/*---------------.
+| Symbol table.  |
+`---------------*/
+
+
+/* Create the symbol table.  */
+void symbols_new (void);
+
+/* 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_ */