Use variants to support objects as semantic values.

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index e6c622c71b5a8ea3c0a6c9ce9bd9aae9915f163a..de2c1defb06cec3fc121aa77b193a8b5ef4de8ea 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -1,29 +1,98 @@
-m4_divert(-1)
-

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

-# Copyright (C) 2002, 2003, 2004, 2005, 2006 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_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([],
 # The header is mandatory.
 b4_defines_if([],

-              [m4_fatal(b4_skeleton[: using %defines is mandatory])])
+              [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])

 
 # Backward compatibility.
 m4_define([b4_location_constructors])
 
 # Backward compatibility.
 m4_define([b4_location_constructors])


@@ -31,11 +100,11 @@ m4_include(b4_pkgdatadir/[location.cc])
 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()
 
 # We do want M4 expansion after # for CPP macros.
 m4_changecom()

-m4_divert(0)dnl
+m4_divert_push(0)dnl

 b4_defines_if(
 b4_defines_if(

-[@output @output_header_name@
+[@output(b4_spec_defines_file@)

 b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++],
 b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++],

-  [2002, 2003, 2004, 2005, 2006])
+             [2002, 2003, 2004, 2005, 2006, 2007, 2008])

 dnl FIXME: This is wrong, we want computed header guards.
 [
 /* C++ LALR(1) parser skeleton written by Akim Demaille.  */
 dnl FIXME: This is wrong, we want computed header guards.
 [
 /* C++ LALR(1) parser skeleton written by Akim Demaille.  */


@@ -43,25 +112,63 @@ dnl FIXME: This is wrong, we want computed header guards.
 #ifndef PARSER_HEADER_H
 # define PARSER_HEADER_H
 
 #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 ]b4_namespace[
-{
+]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;
+    }

 
 

-]m4_ifdef([b4_before_definitions],
-[[/* Copy the %before-definitions blocks.  */
-]b4_before_definitions])[]dnl
+    /// 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


@@ -100,27 +207,34 @@ do {                                                      \
 } while (false)
 #endif
 
 } while (false)
 #endif
 

-namespace ]b4_namespace[
-{
+]b4_namespace_open[

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

-    /// Symbol semantic values.

 #ifndef YYSTYPE
 #ifndef YYSTYPE

-]m4_ifdef([b4_stype],
+]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.
+    typedef variant<sizeof(union_type)> semantic_type;],
+[    /// Symbol semantic values.
+m4_ifdef([b4_stype],

 [    union semantic_type
 [    union semantic_type

-b4_stype
-/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])
-       ;],
-[    typedef int 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
     {
     /// Tokens.
     struct token
     {


@@ -137,6 +251,7 @@ 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.


@@ -148,6 +263,7 @@ 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.


@@ -176,7 +292,7 @@ b4_error_verbose_if([, int tok])[);
     virtual void yy_symbol_print_ (int yytype,
                                   const semantic_type* yyvaluep,
                                   const location_type* yylocationp);
     virtual void yy_symbol_print_ (int yytype,
                                   const semantic_type* yyvaluep,
                                   const location_type* yylocationp);

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

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


@@ -253,6 +369,10 @@ 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
 
     /// Convert a scanner token number \a t to a symbol number.
 #endif
 
     /// Convert a scanner token number \a t to a symbol number.


@@ -283,50 +403,42 @@ 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
  /* Redirection for backward compatibility.  */
 [b4_token_defines(b4_tokens)
 
 #ifndef YYSTYPE
  /* Redirection for backward compatibility.  */

-# define YYSTYPE b4_namespace::b4_parser_class_name::semantic_type
+# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type

 #endif
 ])
 #endif
 ])

-m4_ifdef([b4_after_definitions],
-[[/* Copy the %after-definitions blocks.  */
-]b4_after_definitions])[]dnl
+b4_percent_code_get([[provides]])[]dnl

 
 [#endif /* ! defined PARSER_HEADER_H */]
 ])dnl
 
 [#endif /* ! defined PARSER_HEADER_H */]
 ])dnl

-@output @output_parser_name@
+@output(b4_parser_file_name@)

 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++],
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++],

-  [2002, 2003, 2004, 2005, 2006])
+             [2002, 2003, 2004, 2005, 2006, 2007, 2008])
+b4_percent_code_get([[top]])[]dnl

 m4_if(b4_prefix, [yy], [],
 [
 // Take the name prefix into account.
 #define yylex   b4_prefix[]lex])[
 
 /* First part of user declarations.  */
 m4_if(b4_prefix, [yy], [],
 [
 // Take the name prefix into account.
 #define yylex   b4_prefix[]lex])[
 
 /* First part of user declarations.  */

-]b4_pre_prologue
+]b4_user_pre_prologue

 
 

-b4_defines_if([
-#include @output_header_name@])[
+b4_defines_if([[
+#include "@basename(]b4_spec_defines_file[@)"]])[

 
 /* User implementation prologue.  */
 
 /* User implementation prologue.  */

-]b4_post_prologue[
+]b4_user_post_prologue
+b4_percent_code_get[]dnl

 
 

-]/* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])[
-
-#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 */


@@ -341,14 +453,12 @@ b4_syncline([@oline@], [@ofile@])[
 /* Suppress unused-variable warnings by "using" E.  */
 #define YYUSE(e) ((void) (e))
 
 /* Suppress unused-variable warnings by "using" E.  */
 #define YYUSE(e) ((void) (e))
 

-/* A pseudo ostream that takes yydebug_ into account.  */
-# define YYCDEBUG                                                      \
-  for (bool yydebugcond_ = yydebug_; yydebugcond_; yydebugcond_ = false)       \
-    (*yycdebug_)
-

 /* 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_)                                                \
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location) \
 do {                                                   \
   if (yydebug_)                                                \


@@ -373,18 +483,22 @@ 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_)

 
 

-namespace ]b4_namespace[
-{
+]b4_namespace_open[

 #if YYERROR_VERBOSE
 
   /* Return YYSTR after stripping away unnecessary quotes and
 #if YYERROR_VERBOSE
 
   /* Return YYSTR after stripping away unnecessary quotes and


@@ -427,9 +541,12 @@ namespace ]b4_namespace[
 #endif
 
   /// Build a parser object.
 #endif
 
   /// 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[

   {
   }
 
   {
   }
 


@@ -467,7 +584,7 @@ namespace ]b4_namespace[
     yy_symbol_value_print_ (yytype, yyvaluep, yylocationp);
     *yycdebug_ << ')';
   }
     yy_symbol_value_print_ (yytype, yyvaluep, yylocationp);
     *yycdebug_ << ')';
   }

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

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


@@ -495,6 +612,7 @@ namespace ]b4_namespace[
     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
   {


@@ -519,7 +637,7 @@ namespace ]b4_namespace[
   {
     yydebug_ = l;
   }
   {
     yydebug_ = l;
   }

-
+#endif

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


@@ -542,7 +660,7 @@ namespace ]b4_namespace[
     /// Location of the lookahead.
     location_type yylloc;
     /// The locations where the error started and ended.
     /// Location of the lookahead.
     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;


@@ -557,11 +675,9 @@ namespace ]b4_namespace[
 m4_pushdef([b4_at_dollar],     [yylloc])dnl
 m4_pushdef([b4_dollar_dollar], [yylval])dnl
     /* User initialization code.  */
 m4_pushdef([b4_at_dollar],     [yylloc])dnl
 m4_pushdef([b4_dollar_dollar], [yylval])dnl
     /* User initialization code.  */

-    b4_initial_action
+    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


@@ -577,6 +693,11 @@ b4_syncline([@oline@], [@ofile@])])dnl
   yynewstate:
     yystate_stack_.push (yystate);
     YYCDEBUG << "Entering state " << yystate << std::endl;
   yynewstate:
     yystate_stack_.push (yystate);
     YYCDEBUG << "Entering state " << yystate << std::endl;

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

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


@@ -626,17 +747,11 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
        goto yyreduce;
       }
 
        goto yyreduce;
       }
 

-    /* Accept?  */
-    if (yyn == yyfinal_)
-      goto yyacceptlab;
-

     /* Shift the lookahead token.  */
     YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);
 
     /* Shift the lookahead token.  */
     YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);
 

-    /* Discard the token being shifted unless it is eof.  */
-    if (yychar != yyeof_)
-      yychar = yyempty_;
-
+    /* Discard the token being shifted.  */
+    yychar = yyempty_;

     yysemantic_stack_.push (yylval);
     yylocation_stack_.push (yylloc);
 
     yysemantic_stack_.push (yylval);
     yylocation_stack_.push (yylloc);
 


@@ -661,7 +776,11 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
   | yyreduce -- Do a reduction.  |
   `-----------------------------*/
   yyreduce:
   | yyreduce -- Do a reduction.  |
   `-----------------------------*/
   yyreduce:

-    yylen = yyr2_[yyn];
+    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.
 
     /* If YYLEN is nonzero, implement the default value of the action:
        `$$ = $1'.  Otherwise, use the top of the stack.
 


@@ -669,9 +788,9 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
        This behavior is undocumented and Bison
        users should not rely upon it.  */
     if (yylen)
        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);


@@ -680,17 +799,15 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {
     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {

-       ]b4_actions
-    /* Line __line__ of lalr1.cc.  */
-b4_syncline([@oline@], [@ofile@])[
-       default: break;
+       ]b4_user_actions[
+       default:
+          break;

       }
     YY_SYMBOL_PRINT ("-> $$ =", yyr1_[yyn], &yyval, &yyloc);
 
     yypop_ (yylen);
     yylen = 0;
     YY_STACK_PRINT ();
       }
     YY_SYMBOL_PRINT ("-> $$ =", yyr1_[yyn], &yyval, &yyloc);
 
     yypop_ (yylen);
     yylen = 0;
     YY_STACK_PRINT ();

-

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


@@ -792,9 +909,6 @@ b4_error_verbose_if([, yytoken])[));
        YY_STACK_PRINT ();
       }
 
        YY_STACK_PRINT ();
       }
 

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

     yyerror_range[1] = yylloc;
     // Using YYLLOC is tempting, but would change the location of
     // the lookahead.  YYLOC is available though.
     yyerror_range[1] = yylloc;
     // Using YYLLOC is tempting, but would change the location of
     // the lookahead.  YYLOC is available though.


@@ -804,7 +918,7 @@ b4_error_verbose_if([, yytoken])[));
 
     /* Shift the error token.  */
     YY_SYMBOL_PRINT ("Shifting", yystos_[yyn],
 
     /* Shift the error token.  */
     YY_SYMBOL_PRINT ("Shifting", yystos_[yyn],

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

 
     yystate = yyn;
     goto yynewstate;
 
     yystate = yyn;
     goto yynewstate;


@@ -820,7 +934,7 @@ b4_error_verbose_if([, yytoken])[));
     goto yyreturn;
 
   yyreturn:
     goto yyreturn;
 
   yyreturn:

-    if (yychar != yyeof_ && yychar != yyempty_)
+    if (yychar != yyempty_)

       yydestruct_ ("Cleanup: discarding lookahead", yytoken, &yylval, &yylloc);
 
     /* Do not reclaim the symbols of the rule which action triggered
       yydestruct_ ("Cleanup: discarding lookahead", yytoken, &yylval, &yylloc);
 
     /* Do not reclaim the symbols of the rule which action triggered


@@ -1022,7 +1136,7 @@ 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 << " =",


@@ -1060,21 +1174,20 @@ 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 ]b4_namespace[
+]b4_namespace_close[

 
 ]b4_epilogue
 dnl
 
 ]b4_epilogue
 dnl

-@output b4_dir_prefix[]stack.hh
+@output(b4_dir_prefix[]stack.hh@)

 b4_copyright([Stack handling for Bison parsers in C++],
 b4_copyright([Stack handling for Bison parsers in C++],

-  [2002, 2003, 2004, 2005, 2006])[
+             [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 ]b4_namespace[
-{
+]b4_namespace_open[

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


@@ -1160,7 +1273,8 @@ namespace ]b4_namespace[
     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)