Bench the three-stack lalr1.cc.

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index 38c567ac6f849e03ea023edf6ca038fbf1aaa87f..7195c28d015a3089bb623ca3d9ce6933afa72165 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -1,70 +1,197 @@
-m4_divert(-1)
-

 # C++ skeleton for Bison
 
 # C++ skeleton for Bison
 

-# Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+# Free Software Foundation, Inc.

 
 

-# This program 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
 # it under the terms of the GNU General Public License as published by

-# the Free Software Foundation; either version 2 of the License, or
+# the Free Software Foundation, either version 3 of the License, or

 # (at your option) any later version.
 # (at your option) any later version.

-
+#

 # 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.
 # 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
 # You should have received a copy of the GNU General Public License

-# along with this program; 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/>.

 
 m4_include(b4_pkgdatadir/[c++.m4])
 
 m4_include(b4_pkgdatadir/[c++.m4])

+
+# How the semantic value is extracted when using variants.
+b4_variant_if([
+  # b4_symbol_value(VAL, [TYPE])
+  # ----------------------------
+  m4_define([b4_symbol_value],
+  [m4_ifval([$2],
+            [$1.as<$2>()],
+            [$1])])
+]) # b4_variant_if
+
+
+# b4_symbol_actions(FILENAME, LINENO,
+#                   SYMBOL-TAG, SYMBOL-NUM,
+#                   SYMBOL-ACTION, SYMBOL-TYPENAME)
+# -------------------------------------------------
+# Same as in C, but using references instead of pointers.
+m4_define([b4_symbol_actions],
+[m4_pushdef([b4_dollar_dollar],
+            [b4_symbol_value([yyvalue], [$6])])dnl
+m4_pushdef([b4_at_dollar], [yylocation])dnl
+      case $4: // $3
+b4_syncline([$2], [$1])
+        $5;
+b4_syncline([@oline@], [@ofile@])
+        break;
+m4_popdef([b4_at_dollar])dnl
+m4_popdef([b4_dollar_dollar])dnl
+])
+
+
+# b4_symbol_action_(SYMBOL-TAG, SYMBOL-NUM, SYMBOL-TYPENAME)
+# ----------------------------------------------------------
+# Invoke b4_dollar_dollar(SYMBOL_TYPENAME) for each symbol.
+m4_define([b4_symbol_action_],
+[m4_ifval($3,
+[      case $2: // $1
+        b4_dollar_dollar($@);
+       break;
+])])
+
+
+# b4_symbol_variant(YYTYPE, YYVAL, ACTION)
+# ----------------------------------------
+# Run some ACTION ("build", or "destroy") on YYVAL of symbol type
+# YYTYPE.
+m4_define([b4_symbol_variant],
+[m4_pushdef([b4_dollar_dollar],
+            [$2.$3<$][3>()])dnl
+  switch ($1)
+    {
+m4_map([b4_symbol_action_], m4_defn([b4_type_names]))
+     default:
+       break;
+    }
+m4_popdef([b4_dollar_dollar])dnl
+])
+
+
+# _b4_char_sizeof_counter
+# -----------------------
+# A counter used by _b4_char_sizeof_dummy to create fresh symbols.
+m4_define([_b4_char_sizeof_counter],
+[0])
+
+# _b4_char_sizeof_dummy
+# ---------------------
+# At each call return a new C++ identifier.
+m4_define([_b4_char_sizeof_dummy],
+[m4_define([_b4_char_sizeof_counter], m4_incr(_b4_char_sizeof_counter))dnl
+dummy[]_b4_char_sizeof_counter])
+
+
+# b4_char_sizeof(SYMBOL-TAG, SYMBOL-NUM, SYMBOL-TYPENAME)
+# -------------------------------------------------------
+# To be mapped on the list of type names to produce:
+#
+#    char dummy1[sizeof(type_name_1)];
+#    char dummy2[sizeof(type_name_2)];
+#
+# for defined type names.
+# $3 is doubly-quoted, do not quote it again.
+m4_define([b4_char_sizeof],
+[m4_ifval($3,
+[
+      char _b4_char_sizeof_dummy@{sizeof($3)@}; // $1])dnl
+])
+
+
+m4_define([b4_parser_class_name],
+          [b4_percent_define_get([[parser_class_name]])])
+
+# The header is mandatory.
+b4_defines_if([],
+              [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
+

 # Backward compatibility.
 m4_define([b4_location_constructors])
 m4_include(b4_pkgdatadir/[location.cc])
 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()
 # Backward compatibility.
 m4_define([b4_location_constructors])
 m4_include(b4_pkgdatadir/[location.cc])
 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()

-m4_divert(0)dnl
-m4_if(b4_defines_flag, 0, [],
-[@output @output_header_name@
-b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
-             [2002, 2003, 2004, 2005])
+m4_divert_push(0)dnl
+b4_defines_if(
+[@output(b4_spec_defines_file@)
+b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++],
+             [2002, 2003, 2004, 2005, 2006, 2007, 2008])

 dnl FIXME: This is wrong, we want computed header guards.
 dnl FIXME: This is wrong, we want computed header guards.

-[/* As a special exception, when this parser skeleton is copied by
-   Bison into a Bison output file, you may use that output file
-   without restriction.  This special exception was added by the Free
-   Software Foundation for C++ LALR(1) parsers in version 2.2 of
-   Bison.  */
-
+[

 /* C++ LALR(1) parser skeleton written by Akim Demaille.  */
 
 #ifndef PARSER_HEADER_H
 # define PARSER_HEADER_H
 
 /* C++ LALR(1) parser skeleton written by Akim Demaille.  */
 
 #ifndef PARSER_HEADER_H
 # define PARSER_HEADER_H
 

+]b4_percent_code_get([[requires]])[
+

 #include <string>
 #include <iostream>
 #include "stack.hh"
 
 #include <string>
 #include <iostream>
 #include "stack.hh"
 

-namespace yy
-{
+]b4_namespace_open[

   class position;
   class location;
   class position;
   class location;

-}
+]b4_variant_if([[
+  /// A char[S] buffer to store and retrieve objects.
+  ///
+  /// Sort of a variant, but does not keep track of the nature
+  /// of the stored data, since that knowledge is available
+  /// via the current state.
+  template <size_t S>
+  struct variant
+  {
+    /// Instantiate a \a T in here.
+    template <typename T>
+    inline void
+    build()
+    {
+      new (buffer) T;
+    }

 
 

-/* First part of user declarations.  */
-]b4_pre_prologue[
+    /// Destroy the stored \a T.
+    template <typename T>
+    inline void
+    destroy()
+    {
+      reinterpret_cast<T&>(buffer).~T();
+    }

 
 

-]/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])[
+    /// Accessor to a built \a T.
+    template <typename T>
+    inline T&
+    as()
+    {
+      return reinterpret_cast<T&>(buffer);
+    }

 
 

-]dnl Include location.hh here: it might depend on headers included above.
-[#include "location.hh"
+    /// Const accessor to a built \a T (for %printer).
+    template <typename T>
+    inline const T&
+    as() const
+    {
+      return reinterpret_cast<const T&>(buffer);
+    }
+
+    /// A buffer large enough to store any of the semantic values.
+    char buffer[S];
+  };
+]])[
+]b4_namespace_close[
+
+#include "location.hh"

 
 /* Enabling traces.  */
 #ifndef YYDEBUG
 
 /* Enabling traces.  */
 #ifndef YYDEBUG

-# define YYDEBUG ]b4_debug[
+# define YYDEBUG ]b4_debug_flag[

 #endif
 
 /* Enabling verbose error messages.  */
 #endif
 
 /* Enabling verbose error messages.  */


@@ -72,7 +199,7 @@ b4_syncline([@oline@], [@ofile@])[
 # undef YYERROR_VERBOSE
 # define YYERROR_VERBOSE 1
 #else
 # undef YYERROR_VERBOSE
 # define YYERROR_VERBOSE 1
 #else

-# define YYERROR_VERBOSE ]b4_error_verbose[
+# define YYERROR_VERBOSE ]b4_error_verbose_flag[

 #endif
 
 /* Enabling the token table.  */
 #endif
 
 /* Enabling the token table.  */


@@ -99,31 +226,41 @@ do {                                                       \
 } while (false)
 #endif
 
 } while (false)
 #endif
 

-namespace yy
-{
+]b4_namespace_open[

 
   /// A Bison parser.
   class ]b4_parser_class_name[
   {
   public:
 
   /// A Bison parser.
   class ]b4_parser_class_name[
   {
   public:

+#ifndef YYSTYPE
+]b4_variant_if(
+[    /// An auxiliary type to compute the largest semantic type.
+    union union_type
+    {]m4_map([b4_char_sizeof], m4_defn([b4_type_names]))[
+    };
+

     /// Symbol semantic values.
     /// Symbol semantic values.

-#if ! defined (YYSTYPE)
-]m4_ifdef([b4_stype],
-[b4_syncline([b4_stype_line], [b4_file_name])
-    union semantic_type b4_stype;
-/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])],
-[    typedef int semantic_type;])[
+    typedef variant<sizeof(union_type)> semantic_type;],
+[    /// Symbol semantic values.
+m4_ifdef([b4_stype],
+[    union semantic_type
+    {b4_user_stype
+    };],
+[m4_if(b4_tag_seen_flag, 0,
+[[    typedef int semantic_type;]],
+[[    typedef YYSTYPE semantic_type;]])])])[

 #else
     typedef YYSTYPE semantic_type;
 #endif
     /// Symbol locations.
 #else
     typedef YYSTYPE semantic_type;
 #endif
     /// Symbol locations.

-    typedef ]b4_location_type[ location_type;
+    typedef ]b4_percent_define_get([[location_type]])[ location_type;

     /// Tokens.
     struct token
     {
       ]b4_token_enums(b4_tokens)[
     };
     /// Tokens.
     struct token
     {
       ]b4_token_enums(b4_tokens)[
     };

+    /// Token type.
+    typedef token::yytokentype token_type;

 
     /// Build a parser object.
     ]b4_parser_class_name[ (]b4_parse_param_decl[);
 
     /// Build a parser object.
     ]b4_parser_class_name[ (]b4_parse_param_decl[);


@@ -133,6 +270,7 @@ b4_syncline([@oline@], [@ofile@])],
     /// \returns  0 iff parsing succeeded.
     virtual int parse ();
 
     /// \returns  0 iff parsing succeeded.
     virtual int parse ();
 

+#if YYDEBUG

     /// The current debugging stream.
     std::ostream& debug_stream () const;
     /// Set the current debugging stream.
     /// The current debugging stream.
     std::ostream& debug_stream () const;
     /// Set the current debugging stream.


@@ -144,6 +282,7 @@ b4_syncline([@oline@], [@ofile@])],
     debug_level_type debug_level () const;
     /// Set the current debugging level.
     void set_debug_level (debug_level_type l);
     debug_level_type debug_level () const;
     /// Set the current debugging level.
     void set_debug_level (debug_level_type l);

+#endif

 
   private:
     /// Report a syntax error.
 
   private:
     /// Report a syntax error.


@@ -153,19 +292,26 @@ b4_syncline([@oline@], [@ofile@])],
 
     /// Generate an error message.
     /// \param state   the state where the error occurred.
 
     /// Generate an error message.
     /// \param state   the state where the error occurred.

-    /// \param tok     the look-ahead token.
+    /// \param tok     the lookahead token.

     virtual std::string yysyntax_error_ (int yystate]dnl
 b4_error_verbose_if([, int tok])[);
 
 #if YYDEBUG
     virtual std::string yysyntax_error_ (int yystate]dnl
 b4_error_verbose_if([, int tok])[);
 
 #if YYDEBUG

+    /// \brief Report a symbol value on the debug stream.
+    /// \param yytype       The token type.
+    /// \param yyvalue      Its semantic value.
+    /// \param yylocation   Its location.
+    virtual void yy_symbol_value_print_ (int yytype,
+                                        const semantic_type& yyvalue,
+                                        const location_type& yylocation);

     /// \brief Report a symbol on the debug stream.
     /// \param yytype       The token type.
     /// \brief Report a symbol on the debug stream.
     /// \param yytype       The token type.

-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yysymprint_ (int yytype,
-                             const semantic_type* yyvaluep,
-                             const location_type* yylocationp);
-#endif /* ! YYDEBUG */
+    /// \param yyvalue      Its semantic value.
+    /// \param yylocation   Its location.
+    virtual void yy_symbol_print_ (int yytype,
+                                  const semantic_type& yyvalue,
+                                  const location_type& yylocation);
+#endif

 
 
     /// State numbers.
 
 
     /// State numbers.


@@ -242,20 +388,29 @@ b4_error_verbose_if([, int tok])[);
     virtual void yy_reduce_print_ (int r);
     /// Print the state stack on the debug stream.
     virtual void yystack_print_ ();
     virtual void yy_reduce_print_ (int r);
     /// Print the state stack on the debug stream.
     virtual void yystack_print_ ();

+
+    /* Debugging.  */
+    int yydebug_;
+    std::ostream* yycdebug_;

 #endif
 
 #endif
 

-    /// Convert a scanner token number to a symbol number.
-    inline token_number_type yytranslate_ (int token);
+    /// Convert a scanner token number \a t to a symbol number.
+    token_number_type yytranslate_ (int t);

 
     /// \brief Reclaim the memory associated to a symbol.
     /// \param yymsg        Why this token is reclaimed.
     /// \param yytype       The symbol type.
 
     /// \brief Reclaim the memory associated to a symbol.
     /// \param yymsg        Why this token is reclaimed.
     /// \param yytype       The symbol type.

-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
+    /// \param yyvalue      Its semantic value.
+    /// \param yylocation   Its location.

     inline void yydestruct_ (const char* yymsg,
     inline void yydestruct_ (const char* yymsg,

-                             int yytype,
-                             semantic_type* yyvaluep,
-                             location_type* yylocationp);
+                            int yytype,
+                            semantic_type& yyvalue,
+                            location_type& yylocation);
+
+    /// Push a new state on the stack.
+    /// \warning the contents of \a v is stolen.
+    inline void yypush_ (state_type s,
+                         semantic_type& v, const location_type& l);

 
     /// Pop \a n symbols the three stacks.
     inline void yypop_ (unsigned int n = 1);
 
     /// Pop \a n symbols the three stacks.
     inline void yypop_ (unsigned int n = 1);


@@ -272,43 +427,42 @@ b4_error_verbose_if([, int tok])[);
     static const int yyntokens_;
     static const unsigned int yyuser_token_number_max_;
     static const token_number_type yyundef_token_;
     static const int yyntokens_;
     static const unsigned int yyuser_token_number_max_;
     static const token_number_type yyundef_token_;

-
-    /* Debugging.  */
-    int yydebug_;
-    std::ostream* yycdebug_;
-

 ]b4_parse_param_vars[
   };
 ]b4_parse_param_vars[
   };

-}
+]b4_namespace_close[

 
 

-]m4_ifset([b4_global_tokens_and_yystype],
+]b4_percent_define_flag_if([[global_tokens_and_yystype]],

 [b4_token_defines(b4_tokens)
 
 #ifndef YYSTYPE
 [b4_token_defines(b4_tokens)
 
 #ifndef YYSTYPE

- /* Redirection for backward compatibility. */
-# define YYSTYPE yy::b4_parser_class_name::semantic_type
+ /* Redirection for backward compatibility.  */
+# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type

 #endif
 #endif

-])[
-#endif /* ! defined PARSER_HEADER_H */]
+])
+b4_percent_code_get([[provides]])[]dnl
+
+[#endif /* ! defined PARSER_HEADER_H */]

 ])dnl
 ])dnl

-@output @output_parser_name@
-b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison],
-             [2002, 2003, 2004, 2005])
-m4_if(b4_prefix[], [yy], [],
+@output(b4_parser_file_name@)
+b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++],
+             [2002, 2003, 2004, 2005, 2006, 2007, 2008])
+b4_percent_code_get([[top]])[]dnl
+m4_if(b4_prefix, [yy], [],

 [
 // Take the name prefix into account.
 [
 // Take the name prefix into account.

-#define yylex   b4_prefix[]lex])
-m4_if(b4_defines_flag, 0, [],
-[
-#include @output_header_name@])[
+#define yylex   b4_prefix[]lex])[

 
 

-/* User implementation prologue.  */
-]b4_post_prologue[
+/* First part of user declarations.  */
+]b4_user_pre_prologue
+
+b4_defines_if([[
+#include "@basename(]b4_spec_defines_file[@)"]])[

 
 

-]/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])[
+/* User implementation prologue.  */
+]b4_user_post_prologue
+b4_percent_code_get[]dnl

 
 

-#ifndef YY_
+[#ifndef YY_

 # if YYENABLE_NLS
 #  if ENABLE_NLS
 #   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
 # if YYENABLE_NLS
 #  if ENABLE_NLS
 #   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */


@@ -321,22 +475,20 @@ b4_syncline([@oline@], [@ofile@])[
 #endif
 
 /* Suppress unused-variable warnings by "using" E.  */
 #endif
 
 /* Suppress unused-variable warnings by "using" E.  */

-#define YYUSE(e) do {;} while (false && (e))
-
-/* A pseudo ostream that takes yydebug_ into account. */
-# define YYCDEBUG                                                      \
-  for (bool yydebugcond_ = yydebug_; yydebugcond_; yydebugcond_ = false)       \
-    (*yycdebug_)
+#define YYUSE(e) ((void) (e))

 
 /* Enable debugging if requested.  */
 #if YYDEBUG
 
 
 /* Enable debugging if requested.  */
 #if YYDEBUG
 

+/* A pseudo ostream that takes yydebug_ into account.  */
+# define YYCDEBUG if (yydebug_) (*yycdebug_)
+

 # define YY_SYMBOL_PRINT(Title, Type, Value, Location) \
 do {                                                   \
   if (yydebug_)                                                \
     {                                                  \
       *yycdebug_ << Title << ' ';                      \
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location) \
 do {                                                   \
   if (yydebug_)                                                \
     {                                                  \
       *yycdebug_ << Title << ' ';                      \

-      yysymprint_ ((Type), (Value), (Location));       \
+      yy_symbol_print_ ((Type), (Value), (Location));  \

       *yycdebug_ << std::endl;                         \
     }                                                  \
 } while (false)
       *yycdebug_ << std::endl;                         \
     }                                                  \
 } while (false)


@@ -355,63 +507,70 @@ do {                                      \
 
 #else /* !YYDEBUG */
 
 
 #else /* !YYDEBUG */
 

+# define YYCDEBUG if (false) std::cerr

 # define YY_SYMBOL_PRINT(Title, Type, Value, Location)
 # define YY_REDUCE_PRINT(Rule)
 # define YY_STACK_PRINT()
 
 #endif /* !YYDEBUG */
 
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location)
 # define YY_REDUCE_PRINT(Rule)
 # define YY_STACK_PRINT()
 
 #endif /* !YYDEBUG */
 

+#define yyerrok                (yyerrstatus_ = 0)
+#define yyclearin      (yychar = yyempty_)
+

 #define YYACCEPT       goto yyacceptlab
 #define YYABORT                goto yyabortlab
 #define YYERROR                goto yyerrorlab
 #define YYACCEPT       goto yyacceptlab
 #define YYABORT                goto yyabortlab
 #define YYERROR                goto yyerrorlab

+#define YYRECOVERING()  (!!yyerrstatus_)

 
 

+]b4_namespace_open[

 #if YYERROR_VERBOSE
 
 #if YYERROR_VERBOSE
 

-/* Return YYSTR after stripping away unnecessary quotes and
-   backslashes, so that it's suitable for yyerror.  The heuristic is
-   that double-quoting is unnecessary unless the string contains an
-   apostrophe, a comma, or backslash (other than backslash-backslash).
-   YYSTR is taken from yytname.  */
-std::string
-yy::]b4_parser_class_name[::yytnamerr_ (const char *yystr)
-{
-  if (*yystr == '"')
-    {
-      std::string yyr = "";
-      char const *yyp = yystr;
-
-      for (;;)
-       switch (*++yyp)
-         {
-         case '\'':
-         case ',':
-           goto do_not_strip_quotes;
-
-         case '\\':
-           if (*++yyp != '\\')
-             goto do_not_strip_quotes;
-           /* Fall through.  */
-         default:
-           yyr += *yyp;
-           break;
-
-         case '"':
-           return yyr;
-         }
-    do_not_strip_quotes: ;
-    }
+  /* Return YYSTR after stripping away unnecessary quotes and
+     backslashes, so that it's suitable for yyerror.  The heuristic is
+     that double-quoting is unnecessary unless the string contains an
+     apostrophe, a comma, or backslash (other than backslash-backslash).
+     YYSTR is taken from yytname.  */
+  std::string
+  ]b4_parser_class_name[::yytnamerr_ (const char *yystr)
+  {
+    if (*yystr == '"')
+      {
+        std::string yyr = "";
+        char const *yyp = yystr;
+
+        for (;;)
+          switch (*++yyp)
+            {
+            case '\'':
+            case ',':
+              goto do_not_strip_quotes;
+
+            case '\\':
+              if (*++yyp != '\\')
+                goto do_not_strip_quotes;
+              /* Fall through.  */
+            default:
+              yyr += *yyp;
+              break;
+
+            case '"':
+              return yyr;
+            }
+      do_not_strip_quotes: ;
+      }

 
 

-  return yystr;
-}
+    return yystr;
+  }

 
 #endif
 
 
 #endif
 

-namespace yy
-{

   /// Build a parser object.
   /// Build a parser object.

-  ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)
-    : yydebug_ (false),
-      yycdebug_ (&std::cerr)]b4_parse_param_cons[
+  ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
+    :])[
+#if YYDEBUG
+    ]m4_ifset([b4_parse_param], [  ], [ :])[yydebug_ (false),
+      yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
+#endif]b4_parse_param_cons[

   {
   }
 
   {
   }
 


@@ -424,48 +583,60 @@ namespace yy
   | Print this symbol on YYOUTPUT.  |
   `--------------------------------*/
 
   | Print this symbol on YYOUTPUT.  |
   `--------------------------------*/
 

-  void
-  ]b4_parser_class_name[::yysymprint_ (int yytype,
-                           const semantic_type* yyvaluep, const location_type* yylocationp)
+  inline void
+  ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
+                          const semantic_type& yyvalue, const location_type& yylocation)

   {
   {

-    /* Backward compatibility, but should be removed eventually. */
-    std::ostream& cdebug_ = *yycdebug_;
-
-    YYUSE (!&cdebug_);
-    YYUSE (yylocationp);
-    YYUSE (yyvaluep);
-
-    *yycdebug_ << (yytype < yyntokens_ ? "token" : "nterm")
-            << ' ' << yytname_[yytype] << " ("
-               << *yylocationp << ": ";
+    YYUSE (yylocation);
+    YYUSE (yyvalue);

     switch (yytype)
       {
   ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 [       default:
     switch (yytype)
       {
   ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
 [       default:

-          break;
+         break;

       }
       }

+  }
+
+
+  void
+  ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
+                          const semantic_type& yyvalue, const location_type& yylocation)
+  {
+    *yycdebug_ << (yytype < yyntokens_ ? "token" : "nterm")
+              << ' ' << yytname_[yytype] << " ("
+              << yylocation << ": ";
+    yy_symbol_value_print_ (yytype, yyvalue, yylocation);

     *yycdebug_ << ')';
   }
     *yycdebug_ << ')';
   }

-#endif /* ! YYDEBUG */
+#endif

 
   void
   ]b4_parser_class_name[::yydestruct_ (const char* yymsg,
 
   void
   ]b4_parser_class_name[::yydestruct_ (const char* yymsg,

-                           int yytype, semantic_type* yyvaluep, location_type* yylocationp)
+                          int yytype, semantic_type& yyvalue, location_type& yylocation)

   {
   {

-    YYUSE (yylocationp);

     YYUSE (yymsg);
     YYUSE (yymsg);

-    YYUSE (yyvaluep);
+    YYUSE (yyvalue);
+    YYUSE (yylocation);

 
 

-    YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
+    YY_SYMBOL_PRINT (yymsg, yytype, yyvalue, yylocation);

 
     switch (yytype)
       {
   ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
 
     switch (yytype)
       {
   ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[

-        default:
-          break;
+       default:
+         break;

       }
   }
 
       }
   }
 

+  void
+  ]b4_parser_class_name[::yypush_ (state_type s,
+                           semantic_type& v, const location_type& l)
+  {
+    yystate_stack_.push (s);
+    yysemantic_stack_.push (v);
+    yylocation_stack_.push (l);
+  }
+

   void
   ]b4_parser_class_name[::yypop_ (unsigned int n)
   {
   void
   ]b4_parser_class_name[::yypop_ (unsigned int n)
   {


@@ -474,6 +645,7 @@ namespace yy
     yylocation_stack_.pop (n);
   }
 
     yylocation_stack_.pop (n);
   }
 

+#if YYDEBUG

   std::ostream&
   ]b4_parser_class_name[::debug_stream () const
   {
   std::ostream&
   ]b4_parser_class_name[::debug_stream () const
   {


@@ -498,30 +670,30 @@ namespace yy
   {
     yydebug_ = l;
   }
   {
     yydebug_ = l;
   }

-
+#endif

 
   int
   ]b4_parser_class_name[::parse ()
   {
 
   int
   ]b4_parser_class_name[::parse ()
   {

-    /// Look-ahead and look-ahead in internal form.
+    /// Lookahead and lookahead in internal form.

     int yychar = yyempty_;
     int yytoken = 0;
 
     /* State.  */
     int yyn;
     int yychar = yyempty_;
     int yytoken = 0;
 
     /* State.  */
     int yyn;

-    int yylen;
+    int yylen = 0;

     int yystate = 0;
 
     int yystate = 0;
 

-    /* Error handling. */
+    /* Error handling.  */

     int yynerrs_ = 0;
     int yyerrstatus_ = 0;
 
     int yynerrs_ = 0;
     int yyerrstatus_ = 0;
 

-    /// Semantic value of the look-ahead.
+    /// Semantic value of the lookahead.

     semantic_type yylval;
     semantic_type yylval;

-    /// Location of the look-ahead.
+    /// Location of the lookahead.

     location_type yylloc;
     /// The locations where the error started and ended.
     location_type yylloc;
     /// The locations where the error started and ended.

-    location yyerror_range[2];
+    location_type yyerror_range[2];

 
     /// $$.
     semantic_type yyval;
 
     /// $$.
     semantic_type yyval;


@@ -535,12 +707,10 @@ namespace yy
 ]m4_ifdef([b4_initial_action], [
 m4_pushdef([b4_at_dollar],     [yylloc])dnl
 m4_pushdef([b4_dollar_dollar], [yylval])dnl
 ]m4_ifdef([b4_initial_action], [
 m4_pushdef([b4_at_dollar],     [yylloc])dnl
 m4_pushdef([b4_dollar_dollar], [yylval])dnl

-    /* User initialization code. */
-    b4_initial_action
+    /* User initialization code.  */
+    b4_user_initial_action

 m4_popdef([b4_dollar_dollar])dnl
 m4_popdef([b4_dollar_dollar])dnl

-m4_popdef([b4_at_dollar])dnl
-  /* Line __line__ of yacc.c.  */
-b4_syncline([@oline@], [@ofile@])])dnl
+m4_popdef([b4_at_dollar])])dnl

 
   [  /* Initialize the stacks.  The initial state will be pushed in
        yynewstate, since the latter expects the semantical and the
 
   [  /* Initialize the stacks.  The initial state will be pushed in
        yynewstate, since the latter expects the semantical and the


@@ -549,30 +719,35 @@ b4_syncline([@oline@], [@ofile@])])dnl
     yystate_stack_ = state_stack_type (0);
     yysemantic_stack_ = semantic_stack_type (0);
     yylocation_stack_ = location_stack_type (0);
     yystate_stack_ = state_stack_type (0);
     yysemantic_stack_ = semantic_stack_type (0);
     yylocation_stack_ = location_stack_type (0);

-    yysemantic_stack_.push (yylval);
-    yylocation_stack_.push (yylloc);
+    yypush_ (yystate, yylval, yylloc);

 
 

-    /* New state.  */
+    // A new state was pushed on the stack.
+    // Invariant: yystate == yystack_[0].state, i.e.,
+    // yystate was just pushed onto the state stack.

   yynewstate:
   yynewstate:

-    yystate_stack_.push (yystate);

     YYCDEBUG << "Entering state " << yystate << std::endl;
     YYCDEBUG << "Entering state " << yystate << std::endl;

+
+    /* Accept?  */
+    if (yystate == yyfinal_)
+      goto yyacceptlab;
+

     goto yybackup;
 
     /* Backup.  */
   yybackup:
 
     goto yybackup;
 
     /* Backup.  */
   yybackup:
 

-    /* Try to take a decision without look-ahead.  */
+    /* Try to take a decision without lookahead.  */

     yyn = yypact_[yystate];
     if (yyn == yypact_ninf_)
       goto yydefault;
 
     yyn = yypact_[yystate];
     if (yyn == yypact_ninf_)
       goto yydefault;
 

-    /* Read a look-ahead token.  */
+    /* Read a lookahead token.  */

     if (yychar == yyempty_)
       {
     if (yychar == yyempty_)
       {

-        YYCDEBUG << "Reading a token: ";
-        yychar = ]b4_c_function_call([yylex], [int],
-                                     [[YYSTYPE*], [&yylval]][]dnl
-b4_location_if([, [[location*], [&yylloc]]])dnl
+       YYCDEBUG << "Reading a token: ";
+       yychar = ]b4_c_function_call([yylex], [int],
+                                    [[YYSTYPE*], [&yylval]][]dnl
+b4_locations_if([, [[location*], [&yylloc]]])dnl

 m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
       }
 
 m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
       }
 


@@ -580,13 +755,13 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     /* Convert token to internal form.  */
     if (yychar <= yyeof_)
       {
     /* Convert token to internal form.  */
     if (yychar <= yyeof_)
       {

-        yychar = yytoken = yyeof_;
-        YYCDEBUG << "Now at end of input." << std::endl;
+       yychar = yytoken = yyeof_;
+       YYCDEBUG << "Now at end of input." << std::endl;

       }
     else
       {
       }
     else
       {

-        yytoken = yytranslate_ (yychar);
-        YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc);
+       yytoken = yytranslate_ (yychar);
+       YY_SYMBOL_PRINT ("Next token is", yytoken, yylval, yylloc);

       }
 
     /* If the proper action on seeing token YYTOKEN is to reduce or to
       }
 
     /* If the proper action on seeing token YYTOKEN is to reduce or to


@@ -599,25 +774,17 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     yyn = yytable_[yyn];
     if (yyn <= 0)
       {
     yyn = yytable_[yyn];
     if (yyn <= 0)
       {

-        if (yyn == 0 || yyn == yytable_ninf_)
-       goto yyerrlab;
-        yyn = -yyn;
-        goto yyreduce;
+       if (yyn == 0 || yyn == yytable_ninf_)
+       goto yyerrlab;
+       yyn = -yyn;
+       goto yyreduce;

       }
 
       }
 

-    /* Accept?  */
-    if (yyn == yyfinal_)
-      goto yyacceptlab;
+    /* Shift the lookahead token.  */
+    YY_SYMBOL_PRINT ("Shifting", yytoken, yylval, yylloc);

 
 

-    /* Shift the look-ahead token.  */
-    YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);
-
-    /* Discard the token being shifted unless it is eof.  */
-    if (yychar != yyeof_)
-      yychar = yyempty_;
-
-    yysemantic_stack_.push (yylval);
-    yylocation_stack_.push (yylloc);
+    /* Discard the token being shifted.  */
+    yychar = yyempty_;

 
     /* Count tokens shifted since error; after three, turn off error
        status.  */
 
     /* Count tokens shifted since error; after three, turn off error
        status.  */


@@ -625,6 +792,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
       --yyerrstatus_;
 
     yystate = yyn;
       --yyerrstatus_;
 
     yystate = yyn;

+    yypush_ (yystate, yylval, yylloc);

     goto yynewstate;
 
   /*-----------------------------------------------------------.
     goto yynewstate;
 
   /*-----------------------------------------------------------.


@@ -640,17 +808,21 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
   | yyreduce -- Do a reduction.  |
   `-----------------------------*/
   yyreduce:
   | yyreduce -- Do a reduction.  |
   `-----------------------------*/
   yyreduce:

-    yylen = yyr2_[yyn];
-    /* If LEN_ is nonzero, implement the default value of the action:
+    yylen = yyr2_[yyn];]b4_variant_if([
+    /* Variants are always initialized to an empty instance of the
+       correct type. The default $$=$1 rule is NOT applied when using
+       variants */
+    ]b4_symbol_variant([[yyr1_@{yyn@}]], [yyval], [build])[],[
+    /* If YYLEN is nonzero, implement the default value of the action:

        `$$ = $1'.  Otherwise, use the top of the stack.
 
        Otherwise, the following line sets YYVAL to garbage.
        This behavior is undocumented and Bison
        users should not rely upon it.  */
     if (yylen)
        `$$ = $1'.  Otherwise, use the top of the stack.
 
        Otherwise, the following line sets YYVAL to garbage.
        This behavior is undocumented and Bison
        users should not rely upon it.  */
     if (yylen)

-      yyval = yysemantic_stack_[yylen - 1];
+      yyval = yysemantic_stack_@{yylen - 1@};

     else
     else

-      yyval = yysemantic_stack_[0];
+      yyval = yysemantic_stack_@{0@};])[

 
     {
       slice<location_type, location_stack_type> slice (yylocation_stack_, yylen);
 
     {
       slice<location_type, location_stack_type> slice (yylocation_stack_, yylen);


@@ -659,28 +831,25 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {
     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {

-        ]b4_actions[
-        default: break;
+       ]b4_user_actions[
+       default:
+          break;

       }
       }

-    YY_SYMBOL_PRINT ("-> $$ =", yyr1_[yyn], &yyval, &yyloc);
-    /* Line __line__ of lalr1.cc.  */
-]b4_syncline([@oline@], [@ofile@])[
+    YY_SYMBOL_PRINT ("-> $$ =", yyr1_[yyn], yyval, yyloc);

 
     yypop_ (yylen);
 
     yypop_ (yylen);

-
+    yylen = 0;

     YY_STACK_PRINT ();
 
     YY_STACK_PRINT ();
 

-    yysemantic_stack_.push (yyval);
-    yylocation_stack_.push (yyloc);
-

     /* Shift the result of the reduction.  */
     yyn = yyr1_[yyn];
     yystate = yypgoto_[yyn - yyntokens_] + yystate_stack_[0];
     if (0 <= yystate && yystate <= yylast_
     /* Shift the result of the reduction.  */
     yyn = yyr1_[yyn];
     yystate = yypgoto_[yyn - yyntokens_] + yystate_stack_[0];
     if (0 <= yystate && yystate <= yylast_

-        && yycheck_[yystate] == yystate_stack_[0])
+       && yycheck_[yystate] == yystate_stack_[0])

       yystate = yytable_[yystate];
     else
       yystate = yydefgoto_[yyn - yyntokens_];
       yystate = yytable_[yystate];
     else
       yystate = yydefgoto_[yyn - yyntokens_];

+    yypush_ (yystate, yyval, yyloc);

     goto yynewstate;
 
   /*------------------------------------.
     goto yynewstate;
 
   /*------------------------------------.


@@ -690,31 +859,31 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     /* If not already recovering from an error, report this error.  */
     if (!yyerrstatus_)
       {
     /* If not already recovering from an error, report this error.  */
     if (!yyerrstatus_)
       {

-        ++yynerrs_;
-        error (yylloc, yysyntax_error_ (yystate]dnl
+       ++yynerrs_;
+       error (yylloc, yysyntax_error_ (yystate]dnl

 b4_error_verbose_if([, yytoken])[));
       }
 
     yyerror_range[0] = yylloc;
     if (yyerrstatus_ == 3)
       {
 b4_error_verbose_if([, yytoken])[));
       }
 
     yyerror_range[0] = yylloc;
     if (yyerrstatus_ == 3)
       {

-        /* If just tried and failed to reuse look-ahead token after an
-        error, discard it.  */
-
-        if (yychar <= yyeof_)
-          {
-         /* Return failure if at end of input.  */
-         if (yychar == yyeof_)
-           YYABORT;
-          }
-        else
-          {
-            yydestruct_ ("Error: discarding", yytoken, &yylval, &yylloc);
-            yychar = yyempty_;
-          }
+       /* If just tried and failed to reuse lookahead token after an
+        error, discard it.  */
+
+       if (yychar <= yyeof_)
+         {
+         /* Return failure if at end of input.  */
+         if (yychar == yyeof_)
+           YYABORT;
+         }
+       else
+         {
+           yydestruct_ ("Error: discarding", yytoken, yylval, yylloc);
+           yychar = yyempty_;
+         }

       }
 
       }
 

-    /* Else will try to reuse look-ahead token after shifting the error
+    /* Else will try to reuse lookahead token after shifting the error

        token.  */
     goto yyerrlab1;
 
        token.  */
     goto yyerrlab1;
 


@@ -731,7 +900,10 @@ b4_error_verbose_if([, yytoken])[));
       goto yyerrorlab;
 
     yyerror_range[0] = yylocation_stack_[yylen - 1];
       goto yyerrorlab;
 
     yyerror_range[0] = yylocation_stack_[yylen - 1];

+    /* Do not reclaim the symbols of the rule which action triggered
+       this YYERROR.  */

     yypop_ (yylen);
     yypop_ (yylen);

+    yylen = 0;

     yystate = yystate_stack_[0];
     goto yyerrlab1;
 
     yystate = yystate_stack_[0];
     goto yyerrlab1;
 


@@ -743,46 +915,42 @@ b4_error_verbose_if([, yytoken])[));
 
     for (;;)
       {
 
     for (;;)
       {

-        yyn = yypact_[yystate];
-        if (yyn != yypact_ninf_)
-       {
-         yyn += yyterror_;
-         if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
-           {
-             yyn = yytable_[yyn];
-             if (0 < yyn)
-               break;
-           }
-       }
-
-        /* Pop the current state because it cannot handle the error token.  */
-        if (yystate_stack_.height () == 1)
-       YYABORT;
-
-        yyerror_range[0] = yylocation_stack_[0];
-        yydestruct_ ("Error: popping",
-                     yystos_[yystate],
-                     &yysemantic_stack_[0], &yylocation_stack_[0]);
-        yypop_ ();
-        yystate = yystate_stack_[0];
-        YY_STACK_PRINT ();
+       yyn = yypact_[yystate];
+       if (yyn != yypact_ninf_)
+       {
+         yyn += yyterror_;
+         if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
+           {
+             yyn = yytable_[yyn];
+             if (0 < yyn)
+               break;
+           }
+       }
+
+       /* Pop the current state because it cannot handle the error token.  */
+       if (yystate_stack_.size () == 1)
+       YYABORT;
+
+       yyerror_range[0] = yylocation_stack_[0];
+       yydestruct_ ("Error: popping",
+                    yystos_[yystate],
+                    yysemantic_stack_[0], yylocation_stack_[0]);
+       yypop_ ();
+       yystate = yystate_stack_[0];
+       YY_STACK_PRINT ();

       }
 
       }
 

-    if (yyn == yyfinal_)
-      goto yyacceptlab;
-

     yyerror_range[1] = yylloc;
     // Using YYLLOC is tempting, but would change the location of
     yyerror_range[1] = yylloc;
     // Using YYLLOC is tempting, but would change the location of

-    // the look-ahead.  YYLOC is available though.
-    YYLLOC_DEFAULT (yyloc, yyerror_range - 1, 2);
-    yysemantic_stack_.push (yylval);
-    yylocation_stack_.push (yyloc);
+    // the lookahead.  YYLOC is available though.
+    YYLLOC_DEFAULT (yyloc, (yyerror_range - 1), 2);

 
 

-    /* Shift the error token. */
+    /* Shift the error token.  */

     YY_SYMBOL_PRINT ("Shifting", yystos_[yyn],
     YY_SYMBOL_PRINT ("Shifting", yystos_[yyn],

-                  &yysemantic_stack_[0], &yylocation_stack_[0]);
+                    yysemantic_stack_[0], yylocation_stack_[0]);

 
     yystate = yyn;
 
     yystate = yyn;

+    yypush_ (yystate, yylval, yyloc);

     goto yynewstate;
 
     /* Accept.  */
     goto yynewstate;
 
     /* Accept.  */


@@ -796,16 +964,19 @@ b4_error_verbose_if([, yytoken])[));
     goto yyreturn;
 
   yyreturn:
     goto yyreturn;
 
   yyreturn:

-    if (yychar != yyeof_ && yychar != yyempty_)
-      yydestruct_ ("Cleanup: discarding lookahead", yytoken, &yylval, &yylloc);
+    if (yychar != yyempty_)
+      yydestruct_ ("Cleanup: discarding lookahead", yytoken, yylval, yylloc);

 
 

-    while (yystate_stack_.height () != 1)
+    /* Do not reclaim the symbols of the rule which action triggered
+       this YYABORT or YYACCEPT.  */
+    yypop_ (yylen);
+    while (yystate_stack_.size () != 1)

       {
       {

-        yydestruct_ ("Cleanup: popping",
-                  yystos_[yystate_stack_[0]],
-                  &yysemantic_stack_[0],
-                  &yylocation_stack_[0]);
-        yypop_ ();
+       yydestruct_ ("Cleanup: popping",
+                     yystos_[yystate_stack_[0]],
+                     yysemantic_stack_[0],
+                     yylocation_stack_[0]);
+       yypop_ ();

       }
 
     return yyresult;
       }
 
     return yyresult;


@@ -817,42 +988,43 @@ b4_error_verbose_if([, yytoken])[));
 b4_error_verbose_if([, int tok])[)
   {
     std::string res;
 b4_error_verbose_if([, int tok])[)
   {
     std::string res;

+    YYUSE (yystate);

 #if YYERROR_VERBOSE
     int yyn = yypact_[yystate];
 #if YYERROR_VERBOSE
     int yyn = yypact_[yystate];

-    if (yypact_ninf_ < yyn && yyn < yylast_)
+    if (yypact_ninf_ < yyn && yyn <= yylast_)

       {
       {

-        /* Start YYX at -YYN if negative to avoid negative indexes in
-           YYCHECK.  */
-        int yyxbegin = yyn < 0 ? -yyn : 0;
-
-        /* Stay within bounds of both yycheck and yytname.  */
-        int yychecklim = yylast_ - yyn;
-        int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
-        int count = 0;
-        for (int x = yyxbegin; x < yyxend; ++x)
-          if (yycheck_[x + yyn] == x && x != yyterror_)
-            ++count;
-
-        // FIXME: This method of building the message is not compatible
-        // with internationalization.  It should work like yacc.c does it.
-        // That is, first build a string that looks like this:
-        // "syntax error, unexpected %s or %s or %s"
-        // Then, invoke YY_ on this string.
-        // Finally, use the string as a format to output
-        // yytname_[tok], etc.
-        // Until this gets fixed, this message appears in English only.
-        res = "syntax error, unexpected ";
-        res += yytnamerr_ (yytname_[tok]);
-        if (count < 5)
-          {
-            count = 0;
-            for (int x = yyxbegin; x < yyxend; ++x)
-              if (yycheck_[x + yyn] == x && x != yyterror_)
-                {
-                  res += (!count++) ? ", expecting " : " or ";
-                  res += yytnamerr_ (yytname_[x]);
-                }
-          }
+       /* Start YYX at -YYN if negative to avoid negative indexes in
+          YYCHECK.  */
+       int yyxbegin = yyn < 0 ? -yyn : 0;
+
+       /* Stay within bounds of both yycheck and yytname.  */
+       int yychecklim = yylast_ - yyn + 1;
+       int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
+       int count = 0;
+       for (int x = yyxbegin; x < yyxend; ++x)
+         if (yycheck_[x + yyn] == x && x != yyterror_)
+           ++count;
+
+       // FIXME: This method of building the message is not compatible
+       // with internationalization.  It should work like yacc.c does it.
+       // That is, first build a string that looks like this:
+       // "syntax error, unexpected %s or %s or %s"
+       // Then, invoke YY_ on this string.
+       // Finally, use the string as a format to output
+       // yytname_[tok], etc.
+       // Until this gets fixed, this message appears in English only.
+       res = "syntax error, unexpected ";
+       res += yytnamerr_ (yytname_[tok]);
+       if (count < 5)
+         {
+           count = 0;
+           for (int x = yyxbegin; x < yyxend; ++x)
+             if (yycheck_[x + yyn] == x && x != yyterror_)
+               {
+                 res += (!count++) ? ", expecting " : " or ";
+                 res += yytnamerr_ (yytname_[x]);
+               }
+         }

       }
     else
 #endif
       }
     else
 #endif


@@ -944,7 +1116,7 @@ b4_error_verbose_if([, int tok])[)
 
 #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
   /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
 
 #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
   /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.

-     First, the terminals, then, starting at \a yyntokens_, nonterminals. */
+     First, the terminals, then, starting at \a yyntokens_, nonterminals.  */

   const char*
   const ]b4_parser_class_name[::yytname_[] =
   {
   const char*
   const ]b4_parser_class_name[::yytname_[] =
   {


@@ -953,7 +1125,7 @@ b4_error_verbose_if([, int tok])[)
 #endif
 
 #if YYDEBUG
 #endif
 
 #if YYDEBUG

-  /* YYRHS -- A `-1'-separated list of the rules' RHS. */
+  /* YYRHS -- A `-1'-separated list of the rules' RHS.  */

   const ]b4_parser_class_name[::rhs_number_type
   ]b4_parser_class_name[::yyrhs_[] =
   {
   const ]b4_parser_class_name[::rhs_number_type
   ]b4_parser_class_name[::yyrhs_[] =
   {


@@ -981,7 +1153,7 @@ b4_error_verbose_if([, int tok])[)
   {
     *yycdebug_ << "Stack now";
     for (state_stack_type::const_iterator i = yystate_stack_.begin ();
   {
     *yycdebug_ << "Stack now";
     for (state_stack_type::const_iterator i = yystate_stack_.begin ();

-         i != yystate_stack_.end (); ++i)
+        i != yystate_stack_.end (); ++i)

       *yycdebug_ << ' ' << *i;
     *yycdebug_ << std::endl;
   }
       *yycdebug_ << ' ' << *i;
     *yycdebug_ << std::endl;
   }


@@ -994,19 +1166,19 @@ b4_error_verbose_if([, int tok])[)
     int yynrhs = yyr2_[yyrule];
     /* Print the symbols being reduced, and their result.  */
     *yycdebug_ << "Reducing stack by rule " << yyrule - 1
     int yynrhs = yyr2_[yyrule];
     /* Print the symbols being reduced, and their result.  */
     *yycdebug_ << "Reducing stack by rule " << yyrule - 1

-               << " (line " << yylno << "), ";
+              << " (line " << yylno << "):" << std::endl;

     /* The symbols being reduced.  */
     for (int yyi = 0; yyi < yynrhs; yyi++)
       YY_SYMBOL_PRINT ("   $" << yyi + 1 << " =",
     /* The symbols being reduced.  */
     for (int yyi = 0; yyi < yynrhs; yyi++)
       YY_SYMBOL_PRINT ("   $" << yyi + 1 << " =",

-                       yyrhs_[yyprhs_[yyrule] + yyi],
-                       &]b4_rhs_value(yynrhs, yyi + 1)[,
-                       &]b4_rhs_location(yynrhs, yyi + 1)[);
+                      yyrhs_[yyprhs_[yyrule] + yyi],
+                      ]b4_rhs_value(yynrhs, yyi + 1)[,
+                      ]b4_rhs_location(yynrhs, yyi + 1)[);

   }
 #endif // YYDEBUG
 
   /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
   ]b4_parser_class_name[::token_number_type
   }
 #endif // YYDEBUG
 
   /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
   ]b4_parser_class_name[::token_number_type

-  ]b4_parser_class_name[::yytranslate_ (int token)
+  ]b4_parser_class_name[::yytranslate_ (int t)

   {
     static
     const token_number_type
   {
     static
     const token_number_type


@@ -1014,8 +1186,8 @@ b4_error_verbose_if([, int tok])[)
     {
       ]b4_translate[
     };
     {
       ]b4_translate[
     };

-    if ((unsigned int) token <= yyuser_token_number_max_)
-      return translate_table[token];
+    if ((unsigned int) t <= yyuser_token_number_max_)
+      return translate_table[t];

     else
       return yyundef_token_;
   }
     else
       return yyundef_token_;
   }


@@ -1032,20 +1204,20 @@ b4_error_verbose_if([, int tok])[)
   const unsigned int ]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[;
   const ]b4_parser_class_name[::token_number_type ]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[;
 
   const unsigned int ]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[;
   const ]b4_parser_class_name[::token_number_type ]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[;
 

-} // namespace yy
+]b4_namespace_close[

 
 ]b4_epilogue
 dnl
 
 ]b4_epilogue
 dnl

-@output b4_dir_prefix[]stack.hh
-b4_copyright([stack handling for Bison C++ parsers], [2002, 2003, 2004, 2005])[
+@output(b4_dir_prefix[]stack.hh@)
+b4_copyright([Stack handling for Bison parsers in C++],
+             [2002, 2003, 2004, 2005, 2006, 2007, 2008])[

 
 #ifndef BISON_STACK_HH
 # define BISON_STACK_HH
 
 #include <deque>
 
 
 #ifndef BISON_STACK_HH
 # define BISON_STACK_HH
 
 #include <deque>
 

-namespace yy
-{
+]b4_namespace_open[

   template <class T, class S = std::deque<T> >
   class stack
   {
   template <class T, class S = std::deque<T> >
   class stack
   {


@@ -1093,17 +1265,17 @@ namespace yy
     }
 
     inline
     }
 
     inline

-    unsigned int
-    height () const
+    typename S::size_type
+    size () const

     {
       return seq_.size ();
     }
 
     inline const_iterator begin () const { return seq_.rbegin (); }
     {
       return seq_.size ();
     }
 
     inline const_iterator begin () const { return seq_.rbegin (); }

-    inline const_iterator end () const { return seq_.rend (); }
+    inline const_iterator end ()   const { return seq_.rend ();   }

 
   private:
 
   private:

-
+    /// The wrapped container.

     S seq_;
   };
 
     S seq_;
   };
 


@@ -1131,7 +1303,8 @@ namespace yy
     const S& stack_;
     unsigned int range_;
   };
     const S& stack_;
     unsigned int range_;
   };

-}
+]b4_namespace_close[

 
 

-#endif // not BISON_STACK_HH]
-m4_divert(-1)
+#endif // not BISON_STACK_HH[]dnl
+]
+m4_divert_pop(0)