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Discussed starting at <http://lists.gnu.org/archive/html/bison-patches/2006-09/msg00060.html>. * NEWS (2.3a+): Mention. * doc/bison.texinfo (Freeing Discarded Symbols): Document this and the previous change today related to mid-rules. (Bison Symbols): Remove %symbol-default and add <*> and <!>. * src/parser-gram.y (PERCENT_SYMBOL_DEFAULT): Remove. (TYPE_TAG_ANY): Add as <*>. (TYPE_TAG_NONE): Add as <!>. (generic_symlist_item): Remove RHS for %symbol-default and add RHS's for <*> and <!>. * src/scan-gram.l (PERCENT_SYMBOL_DEFAULT): Remove. (TYPE_TAG_ANY, TYPE_TAG_NONE): Add. * src/symlist.c (symbol_list_default_new): Split into tagged and tagless versions. (symbol_list_destructor_set, symbol_list_printer_set): Split SYMLIST_DEFAULT case into SYMLIST_DEFAULT_TAGGED and SYMLIST_DEFAULT_TAGLESS. * src/symlist.h: Update symbol_list_default*_new prototypes. (symbol_list.content_type): Split enum value SYMLIST_DEFAULT into SYMLIST_DEFAULT_TAGGED and SYMLIST_DEFAULT_TAGLESS. * src/symtab.c (default_destructor, default_destructor_location, default_printer, default_printer_location): Split each into tagged and tagless versions. (symbol_destructor_get, symbol_destructor_location_get, symbol_printer_get, symbol_printer_location_get): Implement tagged default and tagless default cases. (default_destructor_set, default_printer_set): Split each into tagged and tagless versions. * src/symtab.h: Update prototypes. * tests/actions.at (Default %printer and %destructor): Rename to... (Default tagless %printer and %destructor): ... this, and extend. (Per-type %printer and %destructor): Rename to... (Default tagged and per-type %printer and %destructor): ... this, and extend. (Default %printer and %destructor for user-defined end token): Extend. (Default %printer and %destructor are not for error or $undefined): Update. (Default %printer and %destructor are not for $accept): Update. (Default %printer and %destructor for mid-rule values): Extend. * tests/input.at (Default %printer and %destructor redeclared): Extend. (Unused values with default %destructor): Extend.
273 lines
8.5 KiB
C
273 lines
8.5 KiB
C
/* Definitions for symtab.c and callers, part of Bison.
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Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006
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Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/**
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* \file symtab.h
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* \brief Manipulating ::symbol.
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*/
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#ifndef SYMTAB_H_
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# define SYMTAB_H_
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# include "assoc.h"
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# include "location.h"
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# include "uniqstr.h"
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/*----------.
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| Symbols. |
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`----------*/
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/** Symbol classes. */
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typedef enum
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{
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unknown_sym, /**< Undefined. */
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token_sym, /**< Terminal. */
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nterm_sym /**< Non-terminal. */
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} symbol_class;
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/** Internal token numbers. */
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typedef int symbol_number;
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#define SYMBOL_NUMBER_MAXIMUM INT_MAX
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typedef struct symbol symbol;
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/* When extending this structure, be sure to complete
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symbol_check_alias_consistency. */
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struct symbol
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{
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/** The key, name of the symbol. */
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uniqstr tag;
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/** The location of its first occurrence. */
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location location;
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/** Its \c \%type. */
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uniqstr type_name;
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/** Its \c \%type's location. */
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location type_location;
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/** Any \c \%destructor declared specifically for this symbol.
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Access this field only through <tt>symbol</tt>'s interface functions. For
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example, if <tt>symbol::destructor = NULL</tt>, a default \c \%destructor
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or a per-type \c \%destructor might be appropriate, and
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\c symbol_destructor_get will compute the correct one. */
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const char *destructor;
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/** The location of \c symbol::destructor.
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Access this field only through <tt>symbol</tt>'s interface functions.
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\sa symbol::destructor */
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location destructor_location;
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/** Any \c \%printer declared specifically for this symbol.
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Access this field only through <tt>symbol</tt>'s interface functions.
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\sa symbol::destructor */
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const char *printer;
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/** The location of \c symbol::printer.
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Access this field only through <tt>symbol</tt>'s interface functions.
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\sa symbol::destructor */
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location printer_location;
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symbol_number number;
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location prec_location;
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int prec;
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assoc assoc;
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int user_token_number;
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/* Points to the other in the identifier-symbol pair for an alias.
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Special value USER_NUMBER_ALIAS in the identifier half of the
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identifier-symbol pair for an alias. */
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symbol *alias;
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symbol_class class;
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bool declared;
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};
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/** Undefined user number. */
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#define USER_NUMBER_UNDEFINED -1
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/* `symbol->user_token_number == USER_NUMBER_ALIAS' means this symbol
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*has* (not is) a string literal alias. For instance, `%token foo
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"foo"' has `"foo"' numbered regularly, and `foo' numbered as
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USER_NUMBER_ALIAS. */
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#define USER_NUMBER_ALIAS -9991
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/* Undefined internal token number. */
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#define NUMBER_UNDEFINED (-1)
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/** Print a symbol (for debugging). */
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void symbol_print (symbol *s, FILE *f);
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/** Fetch (or create) the symbol associated to KEY. */
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symbol *symbol_from_uniqstr (const uniqstr key, location loc);
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/** Fetch (or create) the symbol associated to KEY. */
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symbol *symbol_get (const char *key, location loc);
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/** Generate a dummy nonterminal.
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Its name cannot conflict with the user's names. */
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symbol *dummy_symbol_get (location loc);
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/** Is this a dummy nonterminal? */
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bool symbol_is_dummy (const symbol *sym);
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/** Declare the new symbol \c sym. Make it an alias of \c symval. */
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void symbol_make_alias (symbol *sym, symbol *symval, location loc);
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/** Set the \c type_name associated with \c sym.
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Do nothing if passed 0 as \c type_name. */
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void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
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/** Set the \c destructor associated with \c sym. */
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void symbol_destructor_set (symbol *sym, const char *destructor, location loc);
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/** Get the computed \c \%destructor for \c sym, or \c NULL if none. */
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const char *symbol_destructor_get (symbol *sym);
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/** Get the grammar location of the computed \c \%destructor for \c sym.
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\pre <tt>symbol_destructor_get (sym) != NULL</tt> */
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location symbol_destructor_location_get (symbol *sym);
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/** Set the \c printer associated with \c sym. */
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void symbol_printer_set (symbol *sym, const char *printer, location loc);
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/** Get the computed \c \%printer for \c sym, or \c NULL if none. */
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const char *symbol_printer_get (symbol *sym);
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/** Get the grammar location of the computed \c \%printer for \c sym.
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\pre <tt>symbol_printer_get (sym) != NULL</tt> */
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location symbol_printer_location_get (symbol *sym);
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/* Set the \c precedence associated with \c sym.
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Ensure that \a symbol is a terminal.
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Do nothing if invoked with \c undef_assoc as \c assoc. */
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void symbol_precedence_set (symbol *sym, int prec, assoc a, location loc);
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/** Set the \c class associated with \c sym. */
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void symbol_class_set (symbol *sym, symbol_class class, location loc,
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bool declaring);
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/** Set the \c user_token_number associated with \c sym. */
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void symbol_user_token_number_set (symbol *sym, int user_number, location loc);
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/** The error token. */
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extern symbol *errtoken;
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/** The token for unknown tokens. */
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extern symbol *undeftoken;
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/** The end of input token. */
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extern symbol *endtoken;
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/** The genuine start symbol.
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$accept: start-symbol $end */
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extern symbol *accept;
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/** The user start symbol. */
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extern symbol *startsymbol;
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/** The location of the \c \%start declaration. */
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extern location startsymbol_location;
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/*-----------------.
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| Semantic types. |
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`-----------------*/
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/** A semantic type and its associated \c \%destructor and \c \%printer.
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Access the fields of this struct only through the interface functions in
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this file. \sa symbol::destructor */
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typedef struct semantic_type {
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/** The key, name of the semantic type. */
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uniqstr tag;
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/** Any \c %destructor declared for this semantic type. */
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const char *destructor;
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/** The location of \c semantic_type::destructor. */
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location destructor_location;
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/** Any \c %printer declared for this semantic type. */
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const char *printer;
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/** The location of \c semantic_type::printer. */
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location printer_location;
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} semantic_type;
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/** Fetch (or create) the semantic type associated to KEY. */
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semantic_type *semantic_type_from_uniqstr (const uniqstr key);
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/** Fetch (or create) the semantic type associated to KEY. */
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semantic_type *semantic_type_get (const char *key);
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/** Set the \c destructor associated with \c type. */
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void semantic_type_destructor_set (semantic_type *type, const char *destructor,
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location loc);
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/** Set the \c printer associated with \c type. */
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void semantic_type_printer_set (semantic_type *type, const char *printer,
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location loc);
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/*----------------------------------.
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| Symbol and semantic type tables. |
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`----------------------------------*/
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/** Create the symbol and semantic type tables. */
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void symbols_new (void);
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/** Free all the memory allocated for symbols and semantic types. */
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void symbols_free (void);
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/** Check that all the symbols are defined.
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Report any undefined symbols and consider them nonterminals. */
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void symbols_check_defined (void);
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/** Sanity checks and #token_translations construction.
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Perform various sanity checks, assign symbol numbers, and set up
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#token_translations. */
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void symbols_pack (void);
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/*---------------------------------------.
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| Default %destructor's and %printer's. |
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`---------------------------------------*/
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/** Set the default \c \%destructor for tagged values. */
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void default_tagged_destructor_set (const char *destructor, location loc);
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/** Set the default \c \%destructor for tagless values. */
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void default_tagless_destructor_set (const char *destructor, location loc);
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/** Set the default \c \%printer for tagged values. */
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void default_tagged_printer_set (const char *printer, location loc);
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/** Set the default \c \%printer for tagless values. */
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void default_tagless_printer_set (const char *printer, location loc);
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#endif /* !SYMTAB_H_ */
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