X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d2729d44ab05f89e96d199ad6b10e127c1cb0a38..ccdb39e0a6f95cb4a3f19c08885a7c421cdebedb:/src/symtab.h diff --git a/src/symtab.h b/src/symtab.h index 142587c9..61bd4017 100644 --- a/src/symtab.h +++ b/src/symtab.h @@ -1,56 +1,161 @@ /* 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, 675 Mass Ave, Cambridge, MA 02139, 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. */ +#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 **symtab; -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((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_ */