X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/4a120d45e6a181ced2f24f2f6d23e2faa9fbd778..70b7c357476ed3525ddb5d2739e70690cfebb207:/src/symtab.h diff --git a/src/symtab.h b/src/symtab.h index e3000919..1a50bb95 100644 --- a/src/symtab.h +++ b/src/symtab.h @@ -1,59 +1,285 @@ -/* 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, 2000-2002, 2004-2013 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. + This program 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 3 of the License, 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, Inc., 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ + This program 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. -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ -#define TABSIZE 1009 +/** + * \file symtab.h + * \brief Manipulating ::symbol. + */ +#ifndef SYMTAB_H_ +# define SYMTAB_H_ -/* symbol classes */ +# include "assoc.h" +# include "location.h" +# include "scan-code.h" +# include "uniqstr.h" -#define SUNKNOWN 0 -#define STOKEN 1 /* terminal symbol */ -#define SNTERM 2 /* non-terminal */ +/*----------. +| Symbols. | +`----------*/ -#define SALIAS -9991 /* for symbol generated with an alias */ +/** Symbol classes. */ +typedef enum +{ + unknown_sym, /**< Undefined. */ + token_sym, /**< Terminal. */ + nterm_sym /**< Non-terminal. */ +} symbol_class; -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 *firstsymbol; -extern bucket *getsym PARAMS((const char *)); +typedef struct symbol symbol; + +/* Declaration status of a symbol. + + First, it is "undeclared". Then, if "undeclared" and used in a + %printer/%destructor, it is "used". If not "declared" but used in + a rule, it is "needed". Finally, if declared (via a rule for + nonterminals, or %token), it is "declared". + + When status are checked at the end, "declared" symbols are fine, + "used" symbols trigger warnings, otherwise it's an error. */ + +typedef enum + { + /** Used in the input file for an unknown reason (error). */ + undeclared, + /** Used by %destructor/%printer but not defined (warning). */ + used, + /** Used in the gramar (rules) but not defined (error). */ + needed, + /** Defined with %type or %token (good). */ + declared, + } status; + +typedef enum code_props_type code_props_type; +enum code_props_type + { + destructor = 0, + printer = 1, + }; + +enum { CODE_PROPS_SIZE = 2 }; + +/* 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 \c \%type. + + Beware that this is the type_name as was entered by the user, + including silly things such as "]" if she entered "%token <]> t". + Therefore, when outputting type_name to M4, be sure to escape it + into "@}". See quoted_output for instance. */ + uniqstr type_name; + + /** Its \c \%type's location. */ + location type_location; + + /** Any \c \%destructor (resp. \%printer) declared specificially for this + symbol. + + Access this field only through symbol's interface functions. For + example, if symbol::destructor = NULL (resp. symbol::printer + = NULL), a default \c \%destructor (resp. \%printer) or a per-type + \c symbol_destructor_printer_get will compute the correct one. */ + code_props props[CODE_PROPS_SIZE]; + + symbol_number number; + location prec_location; + int prec; + assoc assoc; + int user_token_number; + + /* Points to the other in the symbol-string pair for an alias. + Special value USER_NUMBER_HAS_STRING_ALIAS in the symbol half of the + symbol-string pair for an alias. */ + symbol *alias; + symbol_class class; + status status; +}; + +/** Undefined user number. */ +# define USER_NUMBER_UNDEFINED -1 + +/* `symbol->user_token_number == USER_NUMBER_HAS_STRING_ALIAS' means + this symbol has a literal string alias. For instance, `%token foo + "foo"' has `"foo"' numbered regularly, and `foo' numbered as + USER_NUMBER_HAS_STRING_ALIAS. */ +# define USER_NUMBER_HAS_STRING_ALIAS -9991 + +/* Undefined internal token number. */ +# define NUMBER_UNDEFINED (-1) + +/** 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); + + +/*--------------------. +| Methods on symbol. | +`--------------------*/ + +/** Print a symbol (for debugging). */ +void symbol_print (symbol const *s, FILE *f); + +/** Is this a dummy nonterminal? */ +bool symbol_is_dummy (const symbol *sym); + +/** The name of the code_props type: "\%destructor" or "\%printer". */ +char const *code_props_type_string (code_props_type kind); + +/** The name of the symbol that can be used as an identifier. + ** Consider the alias if needed. + ** Return 0 if there is none (e.g., the symbol is only defined as + ** a string). */ +uniqstr symbol_id_get (symbol const *sym); + +/** + * Make \c str the literal string alias of \c sym. Copy token number, + * symbol number, and type from \c sym to \c str. + */ +void symbol_make_alias (symbol *sym, symbol *str, 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 or \c \%printer associated with \c sym. */ +void symbol_code_props_set (symbol *sym, code_props_type kind, + code_props const *destructor); + +/** Get the computed \c \%destructor or \c %printer for \c sym, which was + initialized with \c code_props_none_init if there's no \c \%destructor or + \c %printer. */ +code_props *symbol_code_props_get (symbol *sym, code_props_type kind); + +/** 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); + + + +/*------------------. +| Special symbols. | +`------------------*/ + +/** 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; + + +/*-----------------. +| Semantic types. | +`-----------------*/ + +/** 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 { + /** The key, name of the semantic type. */ + uniqstr tag; + + /** The location of its first occurence. */ + location location; + + /** Its status : "undeclared", "used" or "declared". + It cannot be "needed". */ + status status; + + /** Any \c %destructor and %printer declared for this + semantic type. */ + code_props props[CODE_PROPS_SIZE]; + +} semantic_type; + +/** Fetch (or create) the semantic type associated to KEY. */ +semantic_type *semantic_type_from_uniqstr (const uniqstr key, + const location *loc); + +/** Fetch (or create) the semantic type associated to KEY. */ +semantic_type *semantic_type_get (const char *key, const location *loc); + +/** Set the \c destructor or \c printer associated with \c type. */ +void semantic_type_code_props_set (semantic_type *type, + code_props_type kind, + code_props const *code); + +/*----------------------------------. +| Symbol and semantic type tables. | +`----------------------------------*/ + +/** 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); + +/** Check that all the symbols are defined. + + Report any undefined symbols and consider them nonterminals. */ +void symbols_check_defined (void); + +/** Sanity checks and #token_translations construction. + + Perform various sanity checks, assign symbol numbers, and set up + #token_translations. */ +void symbols_pack (void); + +#endif /* !SYMTAB_H_ */