X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/95021767a1e93fa7b83f8a6c5ec5fd5f8064dd2c..dd31e17d7e415d3be8fc603f752f7e975297bcc2:/src/symtab.h

diff --git a/src/symtab.h b/src/symtab.h
index 7a25b360..65155227 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,24 +1,22 @@
 /* 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.
+   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., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /**
  * \file symtab.h
@@ -41,8 +39,8 @@
 typedef enum
 {
   unknown_sym,          /**< Undefined.  */
-  token_sym,		/**< Terminal. */
-  nterm_sym		/**< Non-terminal. */
+  token_sym,            /**< Terminal. */
+  nterm_sym             /**< Non-terminal. */
 } symbol_class;
 
 
@@ -87,9 +85,9 @@ struct symbol
   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.  */
+  /* 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;
@@ -98,18 +96,15 @@ struct symbol
 /** Undefined user number.  */
 #define USER_NUMBER_UNDEFINED -1
 
-/* `symbol->user_token_number == USER_NUMBER_ALIAS' means this symbol
-   *has* (not is) a string literal alias.  For instance, `%token foo
+/* `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_ALIAS.  */
-#define USER_NUMBER_ALIAS -9991
+   USER_NUMBER_HAS_STRING_ALIAS.  */
+#define USER_NUMBER_HAS_STRING_ALIAS -9991
 
 /* Undefined internal token number.  */
 #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 *symbol_from_uniqstr (const uniqstr key, location loc);
 
@@ -121,11 +116,28 @@ symbol *symbol_get (const char *key, location loc);
    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);
 
-/** Declare the new symbol \c sym.  Make it an alias of \c symval.  */
-void symbol_make_alias (symbol *sym, symbol *symval, location loc);
+/** 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.
 
@@ -154,12 +166,17 @@ 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);
+                       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.  */