-/* 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, 2007
Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bison is distributed in the hope that it will be useful,
+ 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 Bison; see the file COPYING. If not, write to
- the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/**
+ * \file symtab.h
+ * \brief Manipulating ::symbol.
+ */
#ifndef SYMTAB_H_
# define SYMTAB_H_
-# include "struniq.h"
-# include "location.h"
# include "assoc.h"
+# include "location.h"
+# include "scan-code.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;
-#define SYMBOL_NUMBER_MAX ((symbol_number_t) SHRT_MAX)
+/** Internal token numbers. */
+typedef int symbol_number;
+#define SYMBOL_NUMBER_MAXIMUM INT_MAX
-typedef struct symbol_s symbol_t;
-struct symbol_s
+typedef struct symbol symbol;
+
+/* When extending this structure, be sure to complete
+ symbol_check_alias_consistency. */
+struct symbol
{
- /* The key, name of the symbol. */
- struniq_t tag;
- /* The location of its first occurence. */
- location_t location;
-
- /* Its %type and associated printer and destructor. */
- struniq_t 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 <tt>symbol</tt>'s interface functions. For
+ example, if <tt>symbol::destructor = NULL</tt>, 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 <tt>symbol</tt>'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 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
#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_t *symbol_get (const char *key, location_t location);
+/** Fetch (or create) the symbol associated to KEY. */
+symbol *symbol_from_uniqstr (const uniqstr key, location loc);
-/* Generate a dummy nonterminal, whose name cannot conflict with the
- user's names. */
-symbol_t *dummy_symbol_get (location_t location);
+/** Fetch (or create) the symbol associated to KEY. */
+symbol *symbol_get (const char *key, location loc);
-/* Declare the new SYMBOL. Make it an alias of SYMVAL. */
-void symbol_make_alias (symbol_t *symbol, symbol_t *symval,
- location_t location);
+/** Generate a dummy nonterminal.
-/* Set the TYPE_NAME associated to SYMBOL. Does nothing if passed 0 as
- TYPE_NAME. */
-void symbol_type_set (symbol_t *symbol,
- struniq_t type_name, location_t location);
+ Its name cannot conflict with the user's names. */
+symbol *dummy_symbol_get (location loc);
-/* Set the DESTRUCTOR associated to SYMBOL. */
-void symbol_destructor_set (symbol_t *symbol,
- char *destructor, location_t location);
+/** Is this a dummy nonterminal? */
+bool symbol_is_dummy (const symbol *sym);
-/* Set the PRINTER associated to SYMBOL. */
-void symbol_printer_set (symbol_t *symbol,
- char *printer, location_t location);
+/** 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 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 \c type_name associated with \c sym.
-/* Set the CLASS associated to SYMBOL. */
-void symbol_class_set (symbol_t *symbol,
- symbol_class class, location_t location);
+ Do nothing if passed 0 as \c type_name. */
+void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
-/* Set the USER_TOKEN_NUMBER associated to SYMBOL. */
-void symbol_user_token_number_set (symbol_t *symbol,
- int user_number, location_t location);
+/** Get the \c class string associated with \c sym. */
+const char *symbol_class_get_string (symbol *sym);
+/** Set the \c destructor associated with \c sym. */
+void symbol_destructor_set (symbol *sym, code_props const *destructor);
-/* 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;
+/** 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);
-/*---------------.
-| Symbol table. |
-`---------------*/
+/** 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.
-/* Create the symbol table. */
-void symbols_new (void);
+ 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;
+
+
+/*-----------------.
+| Semantic types. |
+`-----------------*/
-/* A function to apply to each symbol. */
-typedef bool (*symbol_processor) (symbol_t *);
+/** A semantic type and its associated \c \%destructor and \c \%printer.
-/* Apply PROCESSOR to all the symbols. PROCESSOR must return true: on
- false, the processing stops. */
-void symbols_do (symbol_processor processor, void *processor_data);
+ 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;
-/* Free all the memory allocated for symbols. */
+ /** 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. */
+/** 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. */
+/** 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_ */
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