X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/88bce5a2ef15e5b508749e75ddad709aca85b019..b2a0b7ca70f9490693d517d10c9c4a64c9fc1af0:/src/symtab.h diff --git a/src/symtab.h b/src/symtab.h index fd029d90..243d3d0c 100644 --- a/src/symtab.h +++ b/src/symtab.h @@ -1,5 +1,6 @@ -/* Definitions for symtab.c and callers, part of bison, - Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002 +/* 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. @@ -16,60 +17,96 @@ 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 "location.h" # include "assoc.h" +# include "location.h" +# include "uniqstr.h" /*----------. | Symbols. | `----------*/ -/* Symbol classes. */ +/** 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; -/* Internal token numbers. */ -typedef short symbol_number_t; +/** Internal token numbers. */ +typedef int symbol_number; +#define SYMBOL_NUMBER_MAXIMUM INT_MAX + +typedef struct symbol symbol; -typedef struct symbol_s symbol_t; -struct symbol_s +/* When extending this structure, be sure to complete + symbol_check_alias_consistency. */ +struct symbol { - /* The key, name of the symbol. */ - char *tag; - /* The location of its first occurence. */ - location_t location; - - /* Its %type and associated printer and destructor. */ - char *type_name; - char *destructor; - location_t destructor_location; - char *printer; - location_t printer_location; - - symbol_number_t number; - short prec; - assoc_t assoc; + /** The key, name of the symbol. */ + uniqstr tag; + /** The location of its first occurrence. */ + location location; + + /** Its \c \%type. */ + uniqstr type_name; + /** Its \c \%type's location. */ + location type_location; + + /** Any \c \%destructor declared specifically for this symbol. + + Access this field only through symbol's interface functions. For + example, if symbol::destructor = NULL, the default + \c \%destructor or a per-type \c \%destructor might be appropriate, and + \c symbol_destructor_get will compute the correct one. */ + const char *destructor; + + /** The location of \c symbol::destructor. + + Access this field only through symbol's interface functions. + \sa symbol::destructor */ + location destructor_location; + + /** Any \c \%printer declared specifically for this symbol. + + Access this field only through symbol's interface functions. + \sa symbol::destructor */ + const char *printer; + + /** The location of \c symbol::printer. + + Access this field only through symbol's interface functions. + \sa symbol::destructor */ + 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_t *alias; + symbol *alias; symbol_class class; + bool declared; }; -/* Undefined user number. */ +/** Undefined user number. */ #define USER_NUMBER_UNDEFINED -1 /* `symbol->user_token_number == USER_NUMBER_ALIAS' means this symbol @@ -79,84 +116,153 @@ struct symbol_s #define USER_NUMBER_ALIAS -9991 /* Undefined internal token number. */ -#define NUMBER_UNDEFINED ((symbol_number_t) -1) +#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); + +/** Is this a dummy nonterminal? */ +bool symbol_is_dummy (const symbol *sym); + +/** 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); + +/** Get the computed \c \%destructor for \c sym, or \c NULL if none. */ +const char *symbol_destructor_get (symbol *sym); + +/** Get the grammar location of the computed \c \%destructor for \c sym. + + \pre symbol_destructor_get (sym) != NULL */ +location symbol_destructor_location_get (symbol *sym); + +/** Set the \c printer associated with \c sym. */ +void symbol_printer_set (symbol *sym, const char *printer, location loc); + +/** Get the computed \c \%printer for \c sym, or \c NULL if none. */ +const char *symbol_printer_get (symbol *sym); + +/** Get the grammar location of the computed \c \%printer for \c sym. + + \pre symbol_printer_get (sym) != NULL */ +location symbol_printer_location_get (symbol *sym); + +/* 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; -/* Fetch (or create) the symbol associated to KEY. */ -symbol_t *symbol_get PARAMS ((const char *key, location_t location)); -/* Generate a dummy nonterminal, whose name cannot conflict with the - user's names. */ -symbol_t *dummy_symbol_get PARAMS ((location_t location)); +/*-----------------. +| Semantic types. | +`-----------------*/ -/* Declare the new SYMBOL. Make it an alias of SYMVAL. */ -void symbol_make_alias PARAMS ((symbol_t *symbol, symbol_t *symval, - location_t location)); +/** A semantic type and its associated \c \%destructor and \c \%printer. + + Access the fields of this struct only through the interface functions in + this file. \sa symbol::destructor */ +typedef struct semantic_type { + /** The key, name of the semantic type. */ + uniqstr tag; -/* Set the TYPE_NAME associated to SYMBOL. Does nothing if passed 0 as - TYPE_NAME. */ -void symbol_type_set PARAMS ((symbol_t *symbol, - char *type_name, location_t location)); + /** Any \c %destructor declared for this semantic type. */ + const char *destructor; + /** The location of \c semantic_type::destructor. */ + location destructor_location; -/* Set the DESTRUCTOR associated to SYMBOL. */ -void symbol_destructor_set PARAMS ((symbol_t *symbol, - char *destructor, location_t location)); + /** Any \c %printer declared for this semantic type. */ + const char *printer; + /** The location of \c semantic_type::printer. */ + location printer_location; +} semantic_type; -/* Set the PRINTER associated to SYMBOL. */ -void symbol_printer_set PARAMS ((symbol_t *symbol, - char *printer, location_t location)); +/** Fetch (or create) the semantic type associated to KEY. */ +semantic_type *semantic_type_from_uniqstr (const uniqstr key); -/* 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 PARAMS ((symbol_t *symbol, - int prec, assoc_t assoc, - location_t location)); +/** Fetch (or create) the semantic type associated to KEY. */ +semantic_type *semantic_type_get (const char *key); -/* Set the CLASS associated to SYMBOL. */ -void symbol_class_set PARAMS ((symbol_t *symbol, - symbol_class class, location_t location)); +/** Set the \c destructor associated with \c type. */ +void semantic_type_destructor_set (semantic_type *type, const char *destructor, + location loc); -/* Set the USER_TOKEN_NUMBER associated to SYMBOL. */ -void symbol_user_token_number_set PARAMS ((symbol_t *symbol, - int user_number, - location_t location)); +/** Set the \c printer associated with \c type. */ +void semantic_type_printer_set (semantic_type *type, const char *printer, + location loc); +/*----------------------------------. +| Symbol and semantic type tables. | +`----------------------------------*/ -/* 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; +/** Create the symbol and semantic type tables. */ +void symbols_new (void); +/** Free all the memory allocated for symbols and semantic types. */ +void symbols_free (void); -/*---------------. -| Symbol table. | -`---------------*/ +/** Check that all the symbols are defined. + Report any undefined symbols and consider them nonterminals. */ +void symbols_check_defined (void); -/* Create the symbol table. */ -void symbols_new PARAMS ((void)); +/** Sanity checks and #token_translations construction. -/* A function to apply to each symbol. */ -typedef bool (*symbol_processor) PARAMS ((symbol_t *)); + Perform various sanity checks, assign symbol numbers, and set up + #token_translations. */ +void symbols_pack (void); -/* Apply PROCESSOR to all the symbols. PROCESSOR must return TRUE: on - FALSE, the processing stops. */ -void symbols_do PARAMS ((symbol_processor processor, void *processor_data)); -/* Free all the memory allocated for symbols. */ -void symbols_free PARAMS ((void)); +/*-----------------------------------. +| Default %destructor and %printer. | +`-----------------------------------*/ -/* Check that all the symbols are defined. Report any undefined - symbols and consider them nonterminals. */ -void symbols_check_defined PARAMS ((void)); +/** Set the default \c \%destructor. */ +void default_destructor_set (const char *destructor, location loc); -/* Perform various sanity checks, assign symbol numbers, and set up - TOKEN_TRANSLATIONS. */ -void symbols_pack PARAMS ((void)); +/** Set the default \c \%printer. */ +void default_printer_set (const char *printer, location loc); #endif /* !SYMTAB_H_ */