Introduce make_symbol.

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index cf44d1f4cb02a07b04975e57d5c297915d3604b8..4915caa245f55e49d035c5aa4bc9d9a6361929aa 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -18,6 +18,22 @@
 
 m4_include(b4_pkgdatadir/[c++.m4])
 
 
 m4_include(b4_pkgdatadir/[c++.m4])
 

+# b4_table_define(TABLE-NAME, CONTENT)
+# ------------------------------------
+# Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
+m4_define([b4_table_define],
+[const b4_int_type_for([$2])
+  b4_parser_class_name::yy$1_[[]] =
+  {
+  $2
+  }dnl
+])
+
+# b4_symbol_value_template(VAL, [TYPE])
+# -------------------------------------
+# Same as b4_symbol_value, but used in a template method.
+m4_copy([b4_symbol_value], [b4_symbol_value_template])
+

 # How the semantic value is extracted when using variants.
 b4_variant_if([
   # b4_symbol_value(VAL, [TYPE])
 # How the semantic value is extracted when using variants.
 b4_variant_if([
   # b4_symbol_value(VAL, [TYPE])


@@ -26,32 +42,222 @@ b4_variant_if([
   [m4_ifval([$2],
             [$1.as<$2>()],
             [$1])])
   [m4_ifval([$2],
             [$1.as<$2>()],
             [$1])])

+
+  # b4_symbol_value_template(VAL, [TYPE])
+  # -------------------------------------
+  # Same as b4_symbol_value, but used in a template method.
+  m4_define([b4_symbol_value_template],
+  [m4_ifval([$2],
+            [$1.template as<$2>()],
+            [$1])])

 ]) # b4_variant_if
 
 
 ]) # 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: // $1
-        b4_dollar_dollar($@);
+# b4_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT])
+# ------------------------------------------------
+m4_define([b4_assert_if],
+[b4_percent_define_ifdef([[assert]], [$1], [$2])])
+
+
+# b4_lhs_value([TYPE])
+# --------------------
+# Expansion of $<TYPE>$.
+m4_define([b4_lhs_value],
+[b4_symbol_value([yylhs.value], [$1])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+[yylhs.location])
+
+
+# b4_rhs_data(RULE-LENGTH, NUM)
+# -----------------------------
+# Return the data corresponding to the symbol #NUM, where the current
+# rule has RULE-LENGTH symbols on RHS.
+m4_define([b4_rhs_data],
+          [yystack_@{($1) - ($2)@}])
+
+
+# b4_rhs_state(RULE-LENGTH, NUM)
+# -----------------------------
+# The state corresponding to the symbol #NUM, where the current
+# rule has RULE-LENGTH symbols on RHS.
+m4_define([b4_rhs_state],
+          [b4_rhs_data([$1], [$2]).state])
+
+
+# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
+# --------------------------------------
+# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
+# symbols on RHS.
+m4_define([b4_rhs_value],
+          [b4_symbol_value([b4_rhs_data([$1], [$2]).value], [$3])])
+
+
+# b4_rhs_location(RULE-LENGTH, NUM)
+# ---------------------------------
+# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
+# on RHS.
+m4_define([b4_rhs_location],
+          [b4_rhs_data([$1], [$2]).location])
+
+
+# b4_symbol(NUM, FIELD)
+# ---------------------
+# Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
+# undefined.
+m4_define([b4_symbol],
+[m4_indir([b4_symbol($1, $2)])])
+
+
+# b4_symbol_if(NUM, FIELD, IF-TRUE, IF-FALSE)
+# -------------------------------------------
+# If FIELD about symbol #NUM is 1 expand IF-TRUE, if is 0, expand IF-FALSE.
+# Otherwise an error.
+m4_define([b4_symbol_if],
+[m4_case(b4_symbol([$1], [$2]),
+         [1], [$3],
+         [0], [$4],
+         [m4_fatal([$0: field $2 of $1 is not a Boolean:] b4_symbol([$1], [$2]))])])
+
+
+# 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_template([yysym.value], [$6])])dnl
+m4_pushdef([b4_at_dollar], [yysym.location])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_case_(SYMBOL-NUM)
+# ---------------------------
+# Issue a "case NUM" for SYMBOL-NUM.
+m4_define([b4_symbol_case_],
+[      case b4_symbol([$1], [number]): // b4_symbol([$1], [tag])
+])
+
+
+# b4_type_action_(NUMS)
+# ---------------------
+# Run actions for the symbol NUMS that all have the same type-name.
+# Skip NUMS that have no type-name.
+m4_define([b4_type_action_],
+[b4_symbol_if([$1], [has_type_name],
+[m4_map([b4_symbol_case_], [$@])[]dnl
+        b4_dollar_dollar([b4_symbol([$1], [number])],
+                         [b4_symbol([$1], [tag])],
+                         [b4_symbol([$1], [type_name])]);

        break;
        break;

+

 ])])
 
 
 ])])
 
 

-# b4_symbol_variant(YYTYPE, YYVAL, ACTION)
-# ----------------------------------------
+# b4_symbol_constructor_declaration_(SYMBOL-NUMBERS)
+# ----------------------------------------------------
+# Declare the overloaded version of make_symbol for the (common) type of
+# these SYMBOL-NUMBERS.  Use at class-level.
+m4_define([b4_symbol_constructor_declaration_],
+[    template <token_type>
+    static inline symbol_type
+    make_symbol (b4_symbol_if([$1], [has_type_name],
+                              [const b4_symbol([$1], [type_name])& v, ])dnl
+const location_type& l);
+
+])
+
+# b4_symbol_constructor_declarations
+# ----------------------------------
+# Declare the overloaded versions of make_symbol for all the value types.
+# Use at class-level.
+m4_define([b4_symbol_constructor_declarations],
+[b4_variant_if([
+    // Declaration of make_symbol for each value type.
+m4_map([b4_symbol_constructor_declaration_], m4_defn([b4_type_names]))])])
+
+
+
+# b4_symbol_constructor_specialization_(SYMBOL-NUMBER)
+# ----------------------------------------------------
+# Declare the specialization of make_symbol for this each SYMBOL-NUMBER.
+# Specializations cannot be declared at class-level, this must be done
+# at namespace-level.
+m4_define([b4_symbol_constructor_specialization_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [tag_is_id],
+[  template <>
+  inline
+  b4_parser_class_name::symbol_type
+  b4_parser_class_name::make_symbol <b4_parser_class_name::token::b4_symbol([$1], [tag])> (dnl
+b4_symbol_if([$1], [has_type_name],
+             [const b4_symbol([$1], [type_name])& v, ])dnl
+const b4_parser_class_name::location_type& l);
+])])])
+
+# b4_symbol_constructor_specializations
+# -------------------------------------
+# Declare specializations of make_symbol.
+m4_define([b4_symbol_constructor_specializations],
+[b4_variant_if([
+  // Specializations of make_symbol for each symbol type.
+m4_map([b4_symbol_constructor_specialization_],
+       m4_defn([b4_symbol_numbers]))])dnl
+])
+
+
+
+# b4_symbol_constructor_definition_(SYMBOL-NUMBER)
+# ------------------------------------------------
+# Define make_symbol for this SYMBOL-NUMBER.
+m4_define([b4_symbol_constructor_definition_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [tag_is_id],
+[  template <>
+  b4_parser_class_name::symbol_type
+  b4_parser_class_name::make_symbol <b4_parser_class_name::token::b4_symbol([$1], [tag])> (dnl
+b4_symbol_if([$1], [has_type_name],
+             [const b4_symbol([$1], [type_name])& v, ])dnl
+const location_type& l)
+  {
+    return symbol_type (yytranslate_ (token::b4_symbol([$1], [tag])),dnl
+ b4_symbol_if([$1], [has_type_name], [v, ])l);
+  }
+
+])])])
+
+
+# b4_symbol_constructor_declarations
+# ----------------------------------
+# Define the overloaded versions of make_symbol for all the value types.
+m4_define([b4_symbol_constructor_definitions],
+[b4_variant_if(
+[  // Implementation of make_symbol for each symbol type.
+m4_map([b4_symbol_constructor_definition_], m4_defn([b4_symbol_numbers]))])])
+
+
+# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
+# ------------------------------------------------

 # Run some ACTION ("build", or "destroy") on YYVAL of symbol type
 # YYTYPE.
 m4_define([b4_symbol_variant],
 [m4_pushdef([b4_dollar_dollar],
 # 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
+            [$2.$3<$][3>(m4_shift3($@))])dnl

   switch ($1)
     {
   switch ($1)
     {

-m4_map([b4_symbol_action_], m4_defn([b4_type_names]))
-     default:
-       break;
+m4_map([b4_type_action_], m4_defn([b4_type_names]))[]dnl
+      default:
+        break;

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


@@ -71,8 +277,8 @@ m4_define([_b4_char_sizeof_dummy],
 dummy[]_b4_char_sizeof_counter])
 
 
 dummy[]_b4_char_sizeof_counter])
 
 

-# b4_char_sizeof(SYMBOL-TAG, SYMBOL-NUM, SYMBOL-TYPENAME)
-# -------------------------------------------------------
+# b4_char_sizeof(SYMBOL-NUM)
+# --------------------------

 # To be mapped on the list of type names to produce:
 #
 #    char dummy1[sizeof(type_name_1)];
 # To be mapped on the list of type names to produce:
 #
 #    char dummy1[sizeof(type_name_1)];


@@ -81,12 +287,15 @@ dummy[]_b4_char_sizeof_counter])
 # for defined type names.
 # $3 is doubly-quoted, do not quote it again.
 m4_define([b4_char_sizeof],
 # for defined type names.
 # $3 is doubly-quoted, do not quote it again.
 m4_define([b4_char_sizeof],

-[m4_ifval($3,
+[m4_ifval(b4_symbol([$1], [type_name]),

 [
 [

-      char _b4_char_sizeof_dummy@{sizeof($3)@}; // $1])dnl
+      char _b4_char_sizeof_dummy@{sizeof([b4_symbol([$1], [type_name])])@}; // b4_symbol([$1], [tag])])dnl

 ])
 
 
 ])
 
 

+m4_pushdef([b4_copyright_years],
+           [2002, 2003, 2004, 2005, 2006, 2007, 2008])
+

 m4_define([b4_parser_class_name],
           [b4_percent_define_get([[parser_class_name]])])
 
 m4_define([b4_parser_class_name],
           [b4_percent_define_get([[parser_class_name]])])
 


@@ -102,9 +311,8 @@ m4_include(b4_pkgdatadir/[location.cc])
 m4_changecom()
 m4_divert_push(0)dnl
 b4_defines_if(
 m4_changecom()
 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])
+[@output(b4_spec_defines_file@)@
+b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])

 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.  */


@@ -114,6 +322,7 @@ dnl FIXME: This is wrong, we want computed header guards.
 
 ]b4_percent_code_get([[requires]])[
 
 
 ]b4_percent_code_get([[requires]])[
 

+]b4_assert_if([#include <cassert>])[

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


@@ -121,7 +330,8 @@ dnl FIXME: This is wrong, we want computed header guards.
 ]b4_namespace_open[
   class position;
   class location;
 ]b4_namespace_open[
   class position;
   class location;

-]b4_variant_if([[
+]b4_variant_if(
+[[

   /// A char[S] buffer to store and retrieve objects.
   ///
   /// Sort of a variant, but does not keep track of the nature
   /// A char[S] buffer to store and retrieve objects.
   ///
   /// Sort of a variant, but does not keep track of the nature


@@ -129,28 +339,51 @@ dnl FIXME: This is wrong, we want computed header guards.
   /// via the current state.
   template <size_t S>
   struct variant
   /// via the current state.
   template <size_t S>
   struct variant

-  {
+  {]b4_assert_if([
+    /// Whether something is contained.
+    bool built;
+])[
+    /// Empty construction.
+    inline
+    variant ()]b4_assert_if([
+      : built(false)])[
+    {}
+

     /// Instantiate a \a T in here.
     template <typename T>
     /// Instantiate a \a T in here.
     template <typename T>

-    inline void
+    inline T&

     build()
     build()

-    {
-      new (buffer) T;
+    {]b4_assert_if([
+      assert(!built);
+      built = true;])[
+      return *new (buffer) T;

     }
 
     }
 

-    /// Destroy the stored \a T.
+    /// Instantiate a \a T in here from \a t.

     template <typename T>
     template <typename T>

-    inline void
-    destroy()
+    inline T&
+    build(const T& t)
+    {]b4_assert_if([
+      assert(!built);
+      built = true;])[
+      return *new (buffer) T(t);
+    }
+
+    /// Construct and fill.
+    template <typename T>
+    inline
+    variant (const T& t)]b4_assert_if([
+      : built(true)])[

     {
     {

-      reinterpret_cast<T&>(buffer).~T();
+      new (buffer) T(t);

     }
 
     /// Accessor to a built \a T.
     template <typename T>
     inline T&
     as()
     }
 
     /// Accessor to a built \a T.
     template <typename T>
     inline T&
     as()

-    {
+    {]b4_assert_if([
+      assert(built);])[

       return reinterpret_cast<T&>(buffer);
     }
 
       return reinterpret_cast<T&>(buffer);
     }
 


@@ -158,10 +391,39 @@ dnl FIXME: This is wrong, we want computed header guards.
     template <typename T>
     inline const T&
     as() const
     template <typename T>
     inline const T&
     as() const

-    {
+    {]b4_assert_if([
+      assert(built);])[

       return reinterpret_cast<const T&>(buffer);
     }
 
       return reinterpret_cast<const T&>(buffer);
     }
 

+    /// Swap the content with \a other.
+    template <typename T>
+    inline void
+    swap(variant<S>& other)
+    {
+      std::swap(as<T>(), other.as<T>());
+    }
+
+    /// Assign the content of \a other to this.
+    /// Destroys \a other.
+    template <typename T>
+    inline void
+    build(variant<S>& other)
+    {
+      build<T>();
+      swap<T>(other);
+      other.destroy<T>();
+    }
+
+    /// Destroy the stored \a T.
+    template <typename T>
+    inline void
+    destroy()
+    {
+      as<T>().~T();]b4_assert_if([
+      built = false;])[
+    }
+

     /// A buffer large enough to store any of the semantic values.
     char buffer[S];
   };
     /// A buffer large enough to store any of the semantic values.
     char buffer[S];
   };


@@ -193,17 +455,17 @@ dnl FIXME: This is wrong, we want computed header guards.
    the previous symbol: RHS[0] (always defined).  */
 
 #ifndef YYLLOC_DEFAULT
    the previous symbol: RHS[0] (always defined).  */
 
 #ifndef YYLLOC_DEFAULT

-# define YYLLOC_DEFAULT(Current, Rhs, N)               \
-do {                                                   \
-  if (N)                                               \
-    {                                                  \
-      (Current).begin = (Rhs)[1].begin;                        \
-      (Current).end   = (Rhs)[N].end;                  \
-    }                                                  \
-  else                                                 \
-    {                                                  \
-      (Current).begin = (Current).end = (Rhs)[0].end;  \
-    }                                                  \
+# define YYLLOC_DEFAULT(Current, Rhs, N)                        \
+do {                                                            \
+  if (N)                                                        \
+    {                                                           \
+      (Current).begin = (Rhs)[1].location.begin;                \
+      (Current).end   = (Rhs)[N].location.end;                 \
+    }                                                           \
+  else                                                          \
+    {                                                           \
+      (Current).begin = (Current).end = (Rhs)[0].location.end; \
+    }                                                           \

 } while (false)
 #endif
 
 } while (false)
 #endif
 


@@ -217,7 +479,7 @@ do {                                                        \
 ]b4_variant_if(
 [    /// An auxiliary type to compute the largest semantic type.
     union union_type
 ]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]))[
+    {]m4_map([b4_char_sizeof], m4_defn([b4_symbol_numbers]))[

     };
 
     /// Symbol semantic values.
     };
 
     /// Symbol semantic values.


@@ -274,42 +536,10 @@ m4_ifdef([b4_stype],
     /// Generate an error message.
     /// \param state   the state where the error occurred.
     /// \param tok     the lookahead token.
     /// Generate an error message.
     /// \param state   the state where the error occurred.
     /// \param tok     the lookahead token.

-    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 yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yy_symbol_value_print_ (int yytype,
-                                        const semantic_type* yyvaluep,
-                                        const location_type* yylocationp);
-    /// \brief Report a symbol on the debug stream.
-    /// \param yytype       The token type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yy_symbol_print_ (int yytype,
-                                  const semantic_type* yyvaluep,
-                                  const location_type* yylocationp);
-#endif
-
+    virtual std::string yysyntax_error_ (int yystate, int tok);

 
     /// State numbers.
     typedef int state_type;
 
     /// State numbers.
     typedef int state_type;

-    /// State stack type.
-    typedef stack<state_type>    state_stack_type;
-    /// Semantic value stack type.
-    typedef stack<semantic_type> semantic_stack_type;
-    /// location stack type.
-    typedef stack<location_type> location_stack_type;
-
-    /// The state stack.
-    state_stack_type yystate_stack_;
-    /// The semantic value stack.
-    semantic_stack_type yysemantic_stack_;
-    /// The location stack.
-    location_stack_type yylocation_stack_;

 
     /// Internal symbol numbers.
     typedef ]b4_int_type_for([b4_translate])[ token_number_type;
 
     /// Internal symbol numbers.
     typedef ]b4_int_type_for([b4_translate])[ token_number_type;


@@ -355,12 +585,6 @@ b4_error_verbose_if([, int tok])[);
 #endif
 
 #if YYDEBUG
 #endif
 
 #if YYDEBUG

-    /// A type to store symbol numbers and -1.
-    typedef ]b4_int_type_for([b4_rhs])[ rhs_number_type;
-    /// A `-1'-separated list of the rules' RHS.
-    static const rhs_number_type yyrhs_[];
-    /// For each rule, the index of the first RHS symbol in \a yyrhs_.
-    static const ]b4_int_type_for([b4_prhs])[ yyprhs_[];

     /// For each rule, its source line number.
     static const ]b4_int_type_for([b4_rline])[ yyrline_[];
     /// For each scanner token number, its symbol number.
     /// For each rule, its source line number.
     static const ]b4_int_type_for([b4_rline])[ yyrline_[];
     /// For each scanner token number, its symbol number.


@@ -376,35 +600,137 @@ b4_error_verbose_if([, int tok])[);
 #endif
 
     /// Convert a scanner token number \a t to a symbol number.
 #endif
 
     /// Convert a scanner token number \a t to a symbol number.

-    token_number_type yytranslate_ (int t);
+    static inline token_number_type yytranslate_ (int t);
+
+    /// A complete symbol, with its type.
+    template <typename Exact>
+    struct symbol_base_type
+    {
+      /// Default constructor.
+      inline symbol_base_type ();
+
+      /// Constructor.
+      inline symbol_base_type (const location_type& l);
+      inline symbol_base_type (const semantic_type& v, const location_type& l);
+
+      /// Return this with its exact type.
+      const Exact& self () const;
+      Exact& self ();
+
+      /// Return the type of this symbol.
+      int type_get () const;
+
+      /// The semantic value.
+      semantic_type value;
+
+      /// The location.
+      location_type location;
+    };
+
+#if YYDEBUG
+    /// \brief Display a symbol type, value and location.
+    /// \param yyo    The output stream.
+    /// \param yysym  The symbol.
+    template <typename Exact>
+    void yy_print_ (std::ostream& yyo,
+                    const symbol_base_type<Exact>& yysym) const;
+#endif

 
     /// \brief Reclaim the memory associated to a symbol.
 
     /// \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.
-    inline void yydestruct_ (const char* yymsg,
-                            int yytype,
-                            semantic_type* yyvaluep,
-                            location_type* yylocationp);
+    /// \param yymsg     Why this token is reclaimed.
+    ///                  If null, print nothing.
+    /// \param s         The symbol.
+    template <typename Exact>
+    inline void yy_destroy_ (const char* yymsg,
+                             symbol_base_type<Exact>& yysym) const;
+
+  public:
+    /// Element of the stack: a state and its attributes.
+    struct symbol_type : symbol_base_type<symbol_type>
+    {
+      /// The parent class.
+      typedef symbol_base_type<symbol_type> super_type;
+
+      /// Default constructor.
+      inline symbol_type ();
+
+      /// Constructor.
+      inline symbol_type (int t,
+                          const semantic_type& v, const location_type& l);
+
+      inline symbol_type (int t,
+                          const location_type& l);
+
+      /// The symbol type.
+      int type;
+
+      /// Return the type corresponding to this state.
+      inline int type_get_ () const;
+    };
+
+]b4_symbol_constructor_declarations[
+
+  private:
+    /// Element of the stack: a state and its attributes.
+    struct stack_symbol_type : symbol_base_type<stack_symbol_type>
+    {
+      /// The parent class.
+      typedef symbol_base_type<stack_symbol_type> super_type;
+
+      /// Default constructor.
+      inline stack_symbol_type ();
+
+      /// Constructor.
+      inline stack_symbol_type (state_type s,
+                                const semantic_type& v, const location_type& l);
+
+      /// The state.
+      state_type state;
+
+      /// Return the type corresponding to this state.
+      inline int type_get_ () const;
+    };
+
+    /// Stack type.
+    typedef stack<stack_symbol_type> stack_type;
+
+    /// The stack.
+    stack_type yystack_;
+
+    /// Push a new state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param s    the symbol
+    /// \warning the contents of \a s.value is stolen.
+    inline void yypush_ (const char* m, stack_symbol_type& s);
+
+    /// Push a new look ahead token on the state on the stack.
+    /// \param m    a debug message to display
+    ///             if null, no trace is output.
+    /// \param s    the state
+    /// \param sym  the symbol (for its value and location).
+    /// \warning the contents of \a s.value is stolen.
+    inline void yypush_ (const char* m, state_type s, symbol_type& sym);

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

-    static const int yyeof_;
-    /* LAST_ -- Last index in TABLE_.  */
-    static const int yylast_;
-    static const int yynnts_;
-    static const int yyempty_;
-    static const int yyfinal_;
-    static const int yyterror_;
-    static const int yyerrcode_;
-    static const int yyntokens_;
-    static const unsigned int yyuser_token_number_max_;
-    static const token_number_type yyundef_token_;
+    enum
+    {
+      yyeof_ = 0,
+      yylast_ = ]b4_last[,           //< Last index in yytable_.
+      yynnts_ = ]b4_nterms_number[,  //< Number of nonterminal symbols.
+      yyempty_ = -2,
+      yyfinal_ = ]b4_final_state_number[, //< Termination state number.
+      yyterror_ = 1,
+      yyerrcode_ = 256,
+      yyntokens_ = ]b4_tokens_number[,   //< Number of tokens.
+    };
+

 ]b4_parse_param_vars[
   };
 ]b4_parse_param_vars[
   };

+]b4_symbol_constructor_specializations[

 ]b4_namespace_close[
 
 ]b4_percent_define_flag_if([[global_tokens_and_yystype]],
 ]b4_namespace_close[
 
 ]b4_percent_define_flag_if([[global_tokens_and_yystype]],


@@ -419,9 +745,8 @@ b4_percent_code_get([[provides]])[]dnl
 
 [#endif /* ! defined PARSER_HEADER_H */]
 ])dnl
 
 [#endif /* ! defined PARSER_HEADER_H */]
 ])dnl

-@output(b4_parser_file_name@)
-b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++],
-             [2002, 2003, 2004, 2005, 2006, 2007, 2008])
+@output(b4_parser_file_name@)@
+b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])

 b4_percent_code_get([[top]])[]dnl
 m4_if(b4_prefix, [yy], [],
 [
 b4_percent_code_get([[top]])[]dnl
 m4_if(b4_prefix, [yy], [],
 [


@@ -459,34 +784,34 @@ b4_percent_code_get[]dnl
 /* A pseudo ostream that takes yydebug_ into account.  */
 # define YYCDEBUG if (yydebug_) (*yycdebug_)
 
 /* 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 << ' ';                      \
-      yy_symbol_print_ ((Type), (Value), (Location));  \
-      *yycdebug_ << std::endl;                         \
-    }                                                  \
-} while (false)
+# define YY_SYMBOL_PRINT(Title, Symbol)         \
+  do {                                          \
+    if (yydebug_)                               \
+    {                                           \
+      *yycdebug_ << Title << ' ';               \
+      yy_print_ (*yycdebug_, Symbol);           \
+      *yycdebug_ << std::endl;                  \
+    }                                           \
+  } while (false)

 
 # define YY_REDUCE_PRINT(Rule)         \
 
 # define YY_REDUCE_PRINT(Rule)         \

-do {                                   \
-  if (yydebug_)                                \
-    yy_reduce_print_ (Rule);           \
-} while (false)
+  do {                                 \
+    if (yydebug_)                       \
+      yy_reduce_print_ (Rule);         \
+  } while (false)

 
 # define YY_STACK_PRINT()              \
 
 # define YY_STACK_PRINT()              \

-do {                                   \
-  if (yydebug_)                                \
-    yystack_print_ ();                 \
-} while (false)
+  do {                                 \
+    if (yydebug_)                       \
+      yystack_print_ ();                \
+  } while (false)

 
 #else /* !YYDEBUG */
 
 # define YYCDEBUG if (false) std::cerr
 
 #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()
+# define YY_SYMBOL_PRINT(Title, Symbol)  static_cast<void>(0)
+# define YY_REDUCE_PRINT(Rule)           static_cast<void>(0)
+# define YY_STACK_PRINT()                static_cast<void>(0)

 
 #endif /* !YYDEBUG */
 
 
 #endif /* !YYDEBUG */
 


@@ -554,62 +879,175 @@ do {                                     \
   {
   }
 
   {
   }
 

-#if YYDEBUG
-  /*--------------------------------.
-  | Print this symbol on YYOUTPUT.  |
-  `--------------------------------*/

 
 

-  inline void
-  ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
-                          const semantic_type* yyvaluep, const location_type* yylocationp)
+  /*---------------.
+  | Symbol types.  |
+  `---------------*/
+
+  // symbol_base_type.
+  template <typename Exact>
+  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type ()
+    : value()
+    , location()
+  {
+  }
+
+  template <typename Exact>
+  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const location_type& l)
+    : value()
+    , location(l)

   {
   {

-    YYUSE (yylocationp);
-    YYUSE (yyvaluep);
-    switch (yytype)
-      {
-  ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
-[       default:
-         break;
-      }

   }
 
   }
 

+  template <typename Exact>
+  ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const semantic_type& v, const location_type& l)
+    : value(v)
+    , location(l)
+  {
+  }

 
 

-  void
-  ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
-                          const semantic_type* yyvaluep, const location_type* yylocationp)
+  template <typename Exact>
+  const Exact&
+  ]b4_parser_class_name[::symbol_base_type<Exact>::self () const

   {
   {

-    *yycdebug_ << (yytype < yyntokens_ ? "token" : "nterm")
-              << ' ' << yytname_[yytype] << " ("
-              << *yylocationp << ": ";
-    yy_symbol_value_print_ (yytype, yyvaluep, yylocationp);
-    *yycdebug_ << ')';
+    return static_cast<const Exact&>(*this);
+  }
+
+  template <typename Exact>
+  Exact&
+  ]b4_parser_class_name[::symbol_base_type<Exact>::self ()
+  {
+    return static_cast<Exact&>(*this);
+  }
+
+  template <typename Exact>
+  int
+  ]b4_parser_class_name[::symbol_base_type<Exact>::type_get () const
+  {
+    return self ().type_get_ ();
+  }
+
+  // symbol_type.
+  ]b4_parser_class_name[::symbol_type::symbol_type ()
+    : super_type ()
+    , type ()
+  {
+  }
+
+  ]b4_parser_class_name[::symbol_type::symbol_type (int t,
+                           const location_type& l)
+    : super_type (l)
+    , type (t)
+  {
+  }
+
+  ]b4_parser_class_name[::symbol_type::symbol_type (int t,
+                           const semantic_type& v, const location_type& l)
+    : super_type (v, l)
+    , type (t)
+  {
+  }
+
+  int
+  ]b4_parser_class_name[::symbol_type::type_get_ () const
+  {
+    return type;
+  }
+
+]b4_symbol_constructor_definitions[
+
+  // stack_symbol_type.
+  ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
+    : super_type ()
+    , state ()
+  {
+  }
+
+  ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s,
+                           const semantic_type& v, const location_type& l)
+    : super_type (v, l)
+    , state (s)
+  {
+  }
+
+  int
+  ]b4_parser_class_name[::stack_symbol_type::type_get_ () const
+  {
+    return yystos_[state];

   }
   }

-#endif

 
 

+
+  template <typename Exact>

   void
   void

-  ]b4_parser_class_name[::yydestruct_ (const char* yymsg,
-                          int yytype, semantic_type* yyvaluep, location_type* yylocationp)
+  ]b4_parser_class_name[::yy_destroy_ (const char* yymsg,
+                                       symbol_base_type<Exact>& yysym) const

   {
   {

-    YYUSE (yylocationp);
+    int yytype = yysym.type_get ();

     YYUSE (yymsg);
     YYUSE (yymsg);

-    YYUSE (yyvaluep);
-
-    YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
+    if (yymsg)
+      YY_SYMBOL_PRINT (yymsg, yysym);

 
 

+    // User destructor.

     switch (yytype)
       {
     switch (yytype)
       {

-  ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
+]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[

        default:
          break;
        default:
          break;

+      }]b4_variant_if([
+
+    // Type destructor.
+  b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[
+  }
+
+#if YYDEBUG
+  template <typename Exact>
+  void
+  ]b4_parser_class_name[::yy_print_ (std::ostream& yyo,
+                                     const symbol_base_type<Exact>& yysym) const
+  {
+    int yytype = yysym.type_get ();
+    yyo << (yytype < yyntokens_ ? "token" : "nterm")
+        << ' ' << yytname_[yytype] << " ("
+        << yysym.location << ": ";
+    switch (yytype)
+      {
+]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))[
+       default:
+         break;

       }
       }

+    yyo << ')';
+  }
+#endif
+
+  void
+  ]b4_parser_class_name[::yypush_ (const char* m, state_type s,
+                                   symbol_type& sym)
+  {
+    if (m)
+      YY_SYMBOL_PRINT (m, sym);
+]b4_variant_if(
+[[    yystack_.push (stack_symbol_type (s, semantic_type(), sym.location));
+    ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]],
+                       [build], [sym.value])],
+[    yystack_.push (stack_symbol_type (s, sym.value, sym.location));])[
+  }
+
+  void
+  ]b4_parser_class_name[::yypush_ (const char* m, stack_symbol_type& s)
+  {
+    if (m)
+      YY_SYMBOL_PRINT (m, s);
+]b4_variant_if(
+[[    yystack_.push (stack_symbol_type (s.state, semantic_type(), s.location));
+    ]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]],
+                       [build], [s.value])],
+[    yystack_.push (s);])[

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

-    yystate_stack_.pop (n);
-    yysemantic_stack_.pop (n);
-    yylocation_stack_.pop (n);
+    yystack_.pop (n);

   }
 
 #if YYDEBUG
   }
 
 #if YYDEBUG


@@ -642,9 +1080,8 @@ do {                                       \
   int
   ]b4_parser_class_name[::parse ()
   {
   int
   ]b4_parser_class_name[::parse ()
   {

-    /// Lookahead and lookahead in internal form.
+    /// Coded type of the lookahead.

     int yychar = yyempty_;
     int yychar = yyempty_;

-    int yytoken = 0;

 
     /* State.  */
     int yyn;
 
     /* State.  */
     int yyn;


@@ -655,43 +1092,39 @@ do {                                     \
     int yynerrs_ = 0;
     int yyerrstatus_ = 0;
 
     int yynerrs_ = 0;
     int yyerrstatus_ = 0;
 

-    /// Semantic value of the lookahead.
-    semantic_type yylval;
-    /// Location of the lookahead.
-    location_type yylloc;
+    /// The lookahead symbol.
+    symbol_type yyla;
+

     /// The locations where the error started and ended.
     /// The locations where the error started and ended.

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

 
 

-    /// $$.
-    semantic_type yyval;
-    /// @@$.
-    location_type yyloc;
+    /// $$ and @@$.
+    stack_symbol_type yylhs;

 
 

+    /// The return value of parse().

     int yyresult;
 
     YYCDEBUG << "Starting parse" << std::endl;
 
 ]m4_ifdef([b4_initial_action], [
     int yyresult;
 
     YYCDEBUG << "Starting parse" << std::endl;
 
 ]m4_ifdef([b4_initial_action], [

-m4_pushdef([b4_at_dollar],     [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
+m4_pushdef([b4_at_dollar],     [yyla.location])dnl
+m4_pushdef([b4_dollar_dollar], [yyla.value])dnl

     /* User initialization code.  */
     b4_user_initial_action
 m4_popdef([b4_dollar_dollar])dnl
 m4_popdef([b4_at_dollar])])dnl
 
     /* User initialization code.  */
     b4_user_initial_action
 m4_popdef([b4_dollar_dollar])dnl
 m4_popdef([b4_at_dollar])])dnl
 

-  [  /* Initialize the stacks.  The initial state will be pushed in
+  [  /* Initialize the stack.  The initial state will be set in

        yynewstate, since the latter expects the semantical and the
        location values to have been already stored, initialize these
        stacks with a primary value.  */
        yynewstate, since the latter expects the semantical and the
        location values to have been already stored, initialize these
        stacks with a primary value.  */

-    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);
+    yystack_ = stack_type (0);
+    yypush_ (0, 0, yyla);

 
 

-    /* 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;
 
     /* Accept?  */
     YYCDEBUG << "Entering state " << yystate << std::endl;
 
     /* Accept?  */


@@ -713,28 +1146,27 @@ m4_popdef([b4_at_dollar])])dnl
       {
        YYCDEBUG << "Reading a token: ";
        yychar = ]b4_c_function_call([yylex], [int],
       {
        YYCDEBUG << "Reading a token: ";
        yychar = ]b4_c_function_call([yylex], [int],

-                                    [[YYSTYPE*], [&yylval]][]dnl
-b4_locations_if([, [[location*], [&yylloc]]])dnl
+                                    [[YYSTYPE*], [&yyla.value]][]dnl
+b4_locations_if([, [[location*], [&yyla.location]]])dnl

 m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
       }
 
 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_;
+       yychar = yyla.type = yyeof_;

        YYCDEBUG << "Now at end of input." << std::endl;
       }
     else
       {
        YYCDEBUG << "Now at end of input." << std::endl;
       }
     else
       {

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

       }
 
       }
 

-    /* If the proper action on seeing token YYTOKEN is to reduce or to
-       detect an error, take that action.  */
-    yyn += yytoken;
-    if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken)
+    /* If the proper action on seeing token YYLA.TYPE is to reduce or
+       to detect an error, take that action.  */
+    yyn += yyla.type;
+    if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type)

       goto yydefault;
 
     /* Reduce or error.  */
       goto yydefault;
 
     /* Reduce or error.  */


@@ -742,25 +1174,22 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     if (yyn <= 0)
       {
        if (yyn == 0 || yyn == yytable_ninf_)
     if (yyn <= 0)
       {
        if (yyn == 0 || yyn == yytable_ninf_)

-       goto yyerrlab;
+         goto yyerrlab;

        yyn = -yyn;
        goto yyreduce;
       }
 
        yyn = -yyn;
        goto yyreduce;
       }
 

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

     /* Discard the token being shifted.  */
     yychar = yyempty_;
     /* Discard the token being shifted.  */
     yychar = yyempty_;

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

 
     /* Count tokens shifted since error; after three, turn off error
        status.  */
     if (yyerrstatus_)
       --yyerrstatus_;
 
 
     /* Count tokens shifted since error; after three, turn off error
        status.  */
     if (yyerrstatus_)
       --yyerrstatus_;
 

+    /* Shift the lookahead token.  */

     yystate = yyn;
     yystate = yyn;

+    yypush_ ("Shifting", yystate, yyla);

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


@@ -780,45 +1209,61 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     /* Variants are always initialized to an empty instance of the
        correct type. The default $$=$1 rule is NOT applied when using
        variants */
     /* Variants are always initialized to an empty instance of the
        correct type. The default $$=$1 rule is NOT applied when using
        variants */

-    ]b4_symbol_variant([[yyr1_@{yyn@}]], [yyval], [build])[],[
+    ]b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [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.
 

-       Otherwise, the following line sets YYVAL to garbage.
+       Otherwise, the following line sets YYLHS.VALUE to garbage.

        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@};
+      yylhs.value = yystack_@{yylen - 1@}.value;

     else
     else

-      yyval = yysemantic_stack_@{0@};])[
+      yylhs.value = yystack_@{0@}.value;])[

 
 

+    // Compute the default @@$.

     {
     {

-      slice<location_type, location_stack_type> slice (yylocation_stack_, yylen);
-      YYLLOC_DEFAULT (yyloc, slice, yylen);
+      slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
+      YYLLOC_DEFAULT (yylhs.location, slice, yylen);

     }
     }

+
+    // Perform the reduction.

     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {
     YY_REDUCE_PRINT (yyn);
     switch (yyn)
       {

-       ]b4_user_actions[
+]b4_user_actions[

        default:
           break;
       }
        default:
           break;
       }

-    YY_SYMBOL_PRINT ("-> $$ =", yyr1_[yyn], &yyval, &yyloc);
+    // Compute post-reduction state.
+    yyn = yyr1_[yyn];
+    yystate = yypgoto_[yyn - yyntokens_] + yystack_[yylen].state;
+    if (0 <= yystate && yystate <= yylast_
+       && yycheck_[yystate] == yystack_[yylen].state)
+      yystate = yytable_[yystate];
+    else
+      yystate = yydefgoto_[yyn - yyntokens_];
+    yylhs.state = yystate;
+    YY_SYMBOL_PRINT ("-> $$ =", yylhs);
+]b4_variant_if([[
+    // Destroy the lhs symbols.
+    for (int i = 0; i < yylen; ++i)
+      // Destroy a variant which value may have be swapped with
+      // yylhs.value.  The value of yylhs.value (hence maybe one of
+      // these lhs symbols) depends on what does the default
+      // contruction for this type.  In the case of pointers for
+      // instance, nothing is done, so the value is junk.  Therefore
+      // do not try to report the content in the debug trace, it's
+      // junk.  Hence yymsg = 0.  Besides, that keeps exactly the same
+      // traces as with the other Bison skeletons.
+      yy_destroy_ (0, yystack_[i]);]])[

 
     yypop_ (yylen);
     yylen = 0;
     YY_STACK_PRINT ();
 
     yypop_ (yylen);
     yylen = 0;
     YY_STACK_PRINT ();

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

 
     /* Shift the result of the reduction.  */
 
     /* 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])
-      yystate = yytable_[yystate];
-    else
-      yystate = yydefgoto_[yyn - yyntokens_];
+    yypush_ (0, yylhs);

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


@@ -829,11 +1274,10 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
     if (!yyerrstatus_)
       {
        ++yynerrs_;
     if (!yyerrstatus_)
       {
        ++yynerrs_;

-       error (yylloc, yysyntax_error_ (yystate]dnl
-b4_error_verbose_if([, yytoken])[));
+       error (yyla.location, yysyntax_error_ (yystate, yyla.type));

       }
 
       }
 

-    yyerror_range[0] = yylloc;
+    yyerror_range[0].location = yyla.location;

     if (yyerrstatus_ == 3)
       {
        /* If just tried and failed to reuse lookahead token after an
     if (yyerrstatus_ == 3)
       {
        /* If just tried and failed to reuse lookahead token after an


@@ -841,13 +1285,13 @@ b4_error_verbose_if([, yytoken])[));
 
        if (yychar <= yyeof_)
          {
 
        if (yychar <= yyeof_)
          {

-         /* Return failure if at end of input.  */
-         if (yychar == yyeof_)
-           YYABORT;
+            /* Return failure if at end of input.  */
+            if (yychar == yyeof_)
+              YYABORT;

          }
        else
          {
          }
        else
          {

-           yydestruct_ ("Error: discarding", yytoken, &yylval, &yylloc);
+           yy_destroy_ ("Error: discarding", yyla);

            yychar = yyempty_;
          }
       }
            yychar = yyempty_;
          }
       }


@@ -868,12 +1312,12 @@ b4_error_verbose_if([, yytoken])[));
     if (false)
       goto yyerrorlab;
 
     if (false)
       goto yyerrorlab;
 

-    yyerror_range[0] = yylocation_stack_[yylen - 1];
+    yyerror_range[0].location = yystack_[yylen - 1].location;

     /* Do not reclaim the symbols of the rule which action triggered
        this YYERROR.  */
     yypop_ (yylen);
     yylen = 0;
     /* Do not reclaim the symbols of the rule which action triggered
        this YYERROR.  */
     yypop_ (yylen);
     yylen = 0;

-    yystate = yystate_stack_[0];
+    yystate = yystack_[0].state;

     goto yyerrlab1;
 
   /*-------------------------------------------------------------.
     goto yyerrlab1;
 
   /*-------------------------------------------------------------.


@@ -881,46 +1325,40 @@ b4_error_verbose_if([, yytoken])[));
   `-------------------------------------------------------------*/
   yyerrlab1:
     yyerrstatus_ = 3;  /* Each real token shifted decrements this.  */
   `-------------------------------------------------------------*/
   yyerrlab1:
     yyerrstatus_ = 3;  /* Each real token shifted decrements this.  */

+    {
+      stack_symbol_type error_token;
+      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;
+                }
+            }

 
 

-    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_.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 ();
-      }
+          // Pop the current state because it cannot handle the error token.
+          if (yystack_.size () == 1)
+            YYABORT;

 
 

-    yyerror_range[1] = yylloc;
-    // Using YYLLOC is tempting, but would change the location of
-    // the lookahead.  YYLOC is available though.
-    YYLLOC_DEFAULT (yyloc, (yyerror_range - 1), 2);
-    yysemantic_stack_.push (yylval);
-    yylocation_stack_.push (yyloc);
+          yyerror_range[0].location = yystack_[0].location;
+          yy_destroy_ ("Error: popping", yystack_[0]);
+          yypop_ ();
+          yystate = yystack_[0].state;
+          YY_STACK_PRINT ();
+        }

 
 

-    /* Shift the error token.  */
-    YY_SYMBOL_PRINT ("Shifting", yystos_[yyn],
-                    &yysemantic_stack_[0], &yylocation_stack_[0]);
+      yyerror_range[1].location = yyla.location;
+      YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);

 
 

-    yystate = yyn;
+      /* Shift the error token.  */
+      error_token.state = yystate = yyn;
+      yypush_ ("Shifting", error_token);
+    }

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


@@ -935,17 +1373,14 @@ b4_error_verbose_if([, yytoken])[));
 
   yyreturn:
     if (yychar != yyempty_)
 
   yyreturn:
     if (yychar != yyempty_)

-      yydestruct_ ("Cleanup: discarding lookahead", yytoken, &yylval, &yylloc);
+      yy_destroy_ ("Cleanup: discarding lookahead", yyla);

 
     /* Do not reclaim the symbols of the rule which action triggered
        this YYABORT or YYACCEPT.  */
     yypop_ (yylen);
 
     /* Do not reclaim the symbols of the rule which action triggered
        this YYABORT or YYACCEPT.  */
     yypop_ (yylen);

-    while (yystate_stack_.size () != 1)
+    while (yystack_.size () != 1)

       {
       {

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

        yypop_ ();
       }
 
        yypop_ ();
       }
 


@@ -954,8 +1389,8 @@ b4_error_verbose_if([, yytoken])[));
 
   // Generate an error message.
   std::string
 
   // Generate an error message.
   std::string

-  ]b4_parser_class_name[::yysyntax_error_ (int yystate]dnl
-b4_error_verbose_if([, int tok])[)
+  ]b4_parser_class_name[::yysyntax_error_ (int yystate, int]dnl
+b4_error_verbose_if([ tok])[)

   {
     std::string res;
     YYUSE (yystate);
   {
     std::string res;
     YYUSE (yystate);


@@ -1006,83 +1441,43 @@ b4_error_verbose_if([, int tok])[)
   /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
      STATE-NUM.  */
   const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;
   /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
      STATE-NUM.  */
   const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;

-  const ]b4_int_type_for([b4_pact])[
-  ]b4_parser_class_name[::yypact_[] =
-  {
-    ]b4_pact[
-  };
+  ]b4_table_define([pact], [b4_pact])[;

 
   /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE
      doesn't specify something else to do.  Zero means the default is an
      error.  */
 
   /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE
      doesn't specify something else to do.  Zero means the default is an
      error.  */

-  const ]b4_int_type_for([b4_defact])[
-  ]b4_parser_class_name[::yydefact_[] =
-  {
-    ]b4_defact[
-  };
+  ]b4_table_define([defact], [b4_defact])[;

 
   /* YYPGOTO[NTERM-NUM].  */
 
   /* YYPGOTO[NTERM-NUM].  */

-  const ]b4_int_type_for([b4_pgoto])[
-  ]b4_parser_class_name[::yypgoto_[] =
-  {
-    ]b4_pgoto[
-  };
+  ]b4_table_define([pgoto], [b4_pgoto])[;

 
   /* YYDEFGOTO[NTERM-NUM].  */
 
   /* YYDEFGOTO[NTERM-NUM].  */

-  const ]b4_int_type_for([b4_defgoto])[
-  ]b4_parser_class_name[::yydefgoto_[] =
-  {
-    ]b4_defgoto[
-  };
+  ]b4_table_define([defgoto], [b4_defgoto])[;

 
   /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
      positive, shift that token.  If negative, reduce the rule which
      number is the opposite.  If zero, do what YYDEFACT says.  */
   const ]b4_int_type(b4_table_ninf, b4_table_ninf) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;
 
   /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
      positive, shift that token.  If negative, reduce the rule which
      number is the opposite.  If zero, do what YYDEFACT says.  */
   const ]b4_int_type(b4_table_ninf, b4_table_ninf) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;

-  const ]b4_int_type_for([b4_table])[
-  ]b4_parser_class_name[::yytable_[] =
-  {
-    ]b4_table[
-  };
+  ]b4_table_define([table], [b4_table])[;

 
   /* YYCHECK.  */
 
   /* YYCHECK.  */

-  const ]b4_int_type_for([b4_check])[
-  ]b4_parser_class_name[::yycheck_[] =
-  {
-    ]b4_check[
-  };
+  ]b4_table_define([check], [b4_check])[;

 
   /* STOS_[STATE-NUM] -- The (internal number of the) accessing
      symbol of state STATE-NUM.  */
 
   /* STOS_[STATE-NUM] -- The (internal number of the) accessing
      symbol of state STATE-NUM.  */

-  const ]b4_int_type_for([b4_stos])[
-  ]b4_parser_class_name[::yystos_[] =
-  {
-    ]b4_stos[
-  };
+  ]b4_table_define([stos], [b4_stos])[;

 
 #if YYDEBUG
   /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
      to YYLEX-NUM.  */
 
 #if YYDEBUG
   /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
      to YYLEX-NUM.  */

-  const ]b4_int_type_for([b4_toknum])[
-  ]b4_parser_class_name[::yytoken_number_[] =
-  {
-    ]b4_toknum[
-  };
+  ]b4_table_define([token_number], [b4_toknum])[;

 #endif
 
   /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
 #endif
 
   /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */

-  const ]b4_int_type_for([b4_r1])[
-  ]b4_parser_class_name[::yyr1_[] =
-  {
-    ]b4_r1[
-  };
+  ]b4_table_define([r1], [b4_r1])[;

 
   /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
 
   /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */

-  const ]b4_int_type_for([b4_r2])[
-  ]b4_parser_class_name[::yyr2_[] =
-  {
-    ]b4_r2[
-  };
+  ]b4_table_define([r2], [b4_r2])[;

 
 #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.


@@ -1090,41 +1485,24 @@ b4_error_verbose_if([, int tok])[)
   const char*
   const ]b4_parser_class_name[::yytname_[] =
   {
   const char*
   const ]b4_parser_class_name[::yytname_[] =
   {

-    ]b4_tname[
+  ]b4_tname[

   };
 #endif
 
 #if YYDEBUG
   };
 #endif
 
 #if YYDEBUG

-  /* YYRHS -- A `-1'-separated list of the rules' RHS.  */
-  const ]b4_parser_class_name[::rhs_number_type
-  ]b4_parser_class_name[::yyrhs_[] =
-  {
-    ]b4_rhs[
-  };
-
-  /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
-     YYRHS.  */
-  const ]b4_int_type_for([b4_prhs])[
-  ]b4_parser_class_name[::yyprhs_[] =
-  {
-    ]b4_prhs[
-  };
-

   /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
   /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */

-  const ]b4_int_type_for([b4_rline])[
-  ]b4_parser_class_name[::yyrline_[] =
-  {
-    ]b4_rline[
-  };
+  ]b4_table_define([rline], [b4_rline])[;

 
   // Print the state stack on the debug stream.
   void
   ]b4_parser_class_name[::yystack_print_ ()
   {
     *yycdebug_ << "Stack now";
 
   // Print the state stack on the debug stream.
   void
   ]b4_parser_class_name[::yystack_print_ ()
   {
     *yycdebug_ << "Stack now";

-    for (state_stack_type::const_iterator i = yystate_stack_.begin ();
-        i != yystate_stack_.end (); ++i)
-      *yycdebug_ << ' ' << *i;
+    for (stack_type::const_iterator
+           i = yystack_.begin (),
+           i_end = yystack_.end ();
+        i != i_end; ++i)
+      *yycdebug_ << ' ' << i->state;

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


@@ -1140,9 +1518,7 @@ b4_error_verbose_if([, int tok])[)
     /* 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)[);
+                       ]b4_rhs_data(yynrhs, yyi + 1)[);

   }
 #endif // YYDEBUG
 
   }
 #endif // YYDEBUG
 


@@ -1154,33 +1530,22 @@ b4_error_verbose_if([, int tok])[)
     const token_number_type
     translate_table[] =
     {
     const token_number_type
     translate_table[] =
     {

-      ]b4_translate[
+]b4_translate[

     };
     };

-    if ((unsigned int) t <= yyuser_token_number_max_)
+    const unsigned int user_token_number_max_ = ]b4_user_token_number_max[;
+    const token_number_type undef_token_ = ]b4_undef_token_number[;
+
+    if (static_cast<unsigned int> (t) <= user_token_number_max_)

       return translate_table[t];
     else
       return translate_table[t];
     else

-      return yyundef_token_;
+      return undef_token_;

   }
 
   }
 

-  const int ]b4_parser_class_name[::yyeof_ = 0;
-  const int ]b4_parser_class_name[::yylast_ = ]b4_last[;
-  const int ]b4_parser_class_name[::yynnts_ = ]b4_nterms_number[;
-  const int ]b4_parser_class_name[::yyempty_ = -2;
-  const int ]b4_parser_class_name[::yyfinal_ = ]b4_final_state_number[;
-  const int ]b4_parser_class_name[::yyterror_ = 1;
-  const int ]b4_parser_class_name[::yyerrcode_ = 256;
-  const int ]b4_parser_class_name[::yyntokens_ = ]b4_tokens_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[;
-

 ]b4_namespace_close[
 
 ]b4_namespace_close[
 

-]b4_epilogue
-dnl
-@output(b4_dir_prefix[]stack.hh@)
-b4_copyright([Stack handling for Bison parsers in C++],
-             [2002, 2003, 2004, 2005, 2006, 2007, 2008])[
+]b4_epilogue[]dnl
+@output(b4_dir_prefix[]stack.hh@)@
+b4_copyright([Stack handling for Bison parsers in C++])[

 
 #ifndef BISON_STACK_HH
 # define BISON_STACK_HH
 
 #ifndef BISON_STACK_HH
 # define BISON_STACK_HH


@@ -1278,3 +1643,4 @@ b4_copyright([Stack handling for Bison parsers in C++],
 #endif // not BISON_STACK_HH[]dnl
 ]
 m4_divert_pop(0)
 #endif // not BISON_STACK_HH[]dnl
 ]
 m4_divert_pop(0)

+m4_popdef([b4_copyright_years])dnl