X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d2729d44ab05f89e96d199ad6b10e127c1cb0a38..c826013fb38c98861ef0fc5d4dc3fb3fb4f555be:/src/symtab.h?ds=sidebyside diff --git a/src/symtab.h b/src/symtab.h index 142587c9..d56e8f88 100644 --- a/src/symtab.h +++ b/src/symtab.h @@ -1,56 +1,265 @@ -/* 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, 2004-2010 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, 675 Mass Ave, Cambridge, MA 02139, 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. + 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 **symtab; -extern bucket *firstsymbol; -extern bucket *getsym PARAMS((char *)); +typedef struct symbol symbol; + +/* 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. */ + 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, a default \c \%destructor + or a per-type \c \%destructor might be appropriate, and + \c symbol_destructor_get will compute the correct one. */ + code_props destructor; + + /** Any \c \%printer declared specifically for this symbol. + + Access this field only through symbol's interface functions. + \sa symbol::destructor */ + code_props printer; + + 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; + bool declared; +}; + +/** 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 *s, FILE *f); + +/** Is this a dummy nonterminal? */ +bool symbol_is_dummy (const symbol *sym); + +/** Return 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 associated with \c sym. */ +void symbol_destructor_set (symbol *sym, code_props const *destructor); + +/** Get the computed \c \%destructor for \c sym, which was initialized with + \c code_props_none_init if there's no \c \%destructor. */ +code_props const *symbol_destructor_get (symbol const *sym); + +/** Set the \c printer associated with \c sym. */ +void symbol_printer_set (symbol *sym, code_props const *printer); + +/** Get the computed \c \%printer for \c sym, which was initialized with + \c code_props_none_init if there's no \c \%printer. */ +code_props const *symbol_printer_get (symbol const *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); + + + +/*------------------. +| 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; + + /** Any \c %destructor declared for this semantic type. */ + code_props destructor; + /** Any \c %printer declared for this semantic type. */ + code_props printer; +} semantic_type; + +/** Fetch (or create) the semantic type associated to KEY. */ +semantic_type *semantic_type_from_uniqstr (const uniqstr key); + +/** Fetch (or create) the semantic type associated to KEY. */ +semantic_type *semantic_type_get (const char *key); + +/** Set the \c destructor associated with \c type. */ +void semantic_type_destructor_set (semantic_type *type, + code_props const *destructor); + +/** Set the \c printer associated with \c type. */ +void semantic_type_printer_set (semantic_type *type, + code_props const *printer); + +/*----------------------------------. +| 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); + + +/*---------------------------------------. +| Default %destructor's and %printer's. | +`---------------------------------------*/ + +/** Set the default \c \%destructor for tagged values. */ +void default_tagged_destructor_set (code_props const *destructor); +/** Set the default \c \%destructor for tagless values. */ +void default_tagless_destructor_set (code_props const *destructor); + +/** Set the default \c \%printer for tagged values. */ +void default_tagged_printer_set (code_props const *printer); +/** Set the default \c \%printer for tagless values. */ +void default_tagless_printer_set (code_props const *printer); + +#endif /* !SYMTAB_H_ */