-/* Definitions for symtab.c and callers, part of bison,
- Copyright (C) 1984, 1989, 1992, 2000 Free Software Foundation, Inc.
+/* Definitions for symtab.c and callers, part of Bison.
+
+ Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006
+ Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
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. */
+ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+/**
+ * \file symtab.h
+ * \brief Manipulating ::symbol.
+ */
#ifndef SYMTAB_H_
# define SYMTAB_H_
-# include "gram.h"
-#define TABSIZE 1009
+# include "assoc.h"
+# include "location.h"
+# include "uniqstr.h"
-/* symbol classes */
+/*----------.
+| Symbols. |
+`----------*/
+/** Symbol classes. */
typedef enum
{
- unknown_sym,
- token_sym, /* terminal symbol */
- nterm_sym /* non-terminal */
+ unknown_sym, /**< Undefined. */
+ token_sym, /**< Terminal. */
+ nterm_sym /**< Non-terminal. */
} symbol_class;
-#define SALIAS -9991 /* for symbol generated with an alias */
-typedef struct bucket
+/** Internal token numbers. */
+typedef int symbol_number;
+#define SYMBOL_NUMBER_MAXIMUM INT_MAX
+
+
+typedef struct symbol symbol;
+
+/* When extending this structure, be sure to complete
+ symbol_check_alias_consistency. */
+struct symbol
{
- struct bucket *link;
- struct bucket *next;
- char *tag;
- char *type_name;
- short value;
- short prec;
- associativity 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 */
+ /** 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;
+
+ /** Does not own the memory. */
+ const char *destructor;
+ location destructor_location;
+
+ /** Printer. */
+ const 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;
-}
-bucket;
+ bool declared;
+};
+
+
+/** 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_from_uniqstr (const uniqstr key, location loc);
+
+/** Fetch (or create) the symbol associated to KEY. */
+symbol *symbol_get (const char *key, location loc);
+
+/** Generate a dummy nonterminal.
+
+ Its name cannot conflict with the user's names. */
+symbol *dummy_symbol_get (location loc);
+
+/** Declare the new symbol \c sym. Make it an alias of \c symval. */
+void symbol_make_alias (symbol *sym, symbol *symval, location loc);
+
+/** Set the \c type_name associated with \c sym.
+
+ Do nothing if passed 0 as \c type_name. */
+void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
+
+/** Set the \c destructor associated with \c sym. */
+void symbol_destructor_set (symbol *sym, const char *destructor, location loc);
+
+/** Set the \c printer associated with \c sym. */
+void symbol_printer_set (symbol *sym, const char *printer, location loc);
+
+/* Set the \c precedence associated with \c sym.
+
+ Ensure that \a symbol is a terminal.
+ Do nothing if invoked with \c undef_assoc as \c assoc. */
+void symbol_precedence_set (symbol *sym, int prec, assoc a, location loc);
+
+/** Set the \c class associated with \c sym. */
+void symbol_class_set (symbol *sym, symbol_class class, location loc,
+ bool declaring);
+
+/** Set the \c user_token_number associated with \c sym. */
+void symbol_user_token_number_set (symbol *sym, int user_number, location loc);
+
+
+/** The error token. */
+extern symbol *errtoken;
+/** The token for unknown tokens. */
+extern symbol *undeftoken;
+/** The end of input token. */
+extern symbol *endtoken;
+/** The genuine start symbol.
+
+ $accept: start-symbol $end */
+extern symbol *accept;
+
+/** The user start symbol. */
+extern symbol *startsymbol;
+/** The location of the \c %start declaration. */
+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.
-extern bucket *firstsymbol;
+ Report any undefined symbols and consider them nonterminals. */
+void symbols_check_defined (void);
-bucket *getsym PARAMS ((const char *));
+/** Sanity checks and #token_translations construction.
-void tabinit PARAMS ((void));
-void free_symtab PARAMS ((void));
+ Perform various sanity checks, assign symbol numbers, and set up
+ #token_translations. */
+void symbols_pack (void);
#endif /* !SYMTAB_H_ */
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