-/* Definitions for symtab.c and callers, part of bison,
- Copyright (C) 1984, 1989, 1992, 2000 Free Software Foundation, Inc.
+/* Definitions for symtab.c and callers, part of Bison.
+
+ Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2012 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_
-#define TABSIZE 1009
+# include "assoc.h"
+# include "location.h"
+# include "scan-code.h"
+# include "uniqstr.h"
+
+/*----------.
+| Symbols. |
+`----------*/
+
+/** Symbol classes. */
+typedef enum
+{
+ unknown_sym, /**< Undefined. */
+ token_sym, /**< Terminal. */
+ nterm_sym /**< Non-terminal. */
+} symbol_class;
+
-/* symbol classes */
+/** Internal token numbers. */
+typedef int symbol_number;
+#define SYMBOL_NUMBER_MAXIMUM INT_MAX
-#define SUNKNOWN 0
-#define STOKEN 1 /* terminal symbol */
-#define SNTERM 2 /* non-terminal */
-#define SALIAS -9991 /* for symbol generated with an alias */
+typedef struct symbol symbol;
-typedef struct bucket
+/* When extending this structure, be sure to complete
+ symbol_check_alias_consistency. */
+struct symbol
{
- 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;
-
-
-extern bucket *firstsymbol;
-
-bucket *getsym PARAMS ((const char *));
-
-void tabinit PARAMS ((void));
-void free_symtab PARAMS ((void));
+ /** 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 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_ */
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