build: generalize etc/prefix-gnulib-mk

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index b0d14dc0e8c06ebf1c9fadca77510b0684fcc7fb..8afabc21d9f80b91f0079ac6d9a254221e4a92c7 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -1,7 +1,6 @@
 # C++ skeleton for Bison
 
 # C++ skeleton for Bison
 

-# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
-# Free Software Foundation, Inc.
+# Copyright (C) 2002-2012 Free Software Foundation, Inc.

 
 # 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
 
 # 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


@@ -29,7 +28,7 @@ m4_define([b4_integral_parser_table_declare],
 ])
 
 # b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT)
 ])
 
 # b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT)

-# ---------------------------------------------
+# -------------------------------------------------------------

 # Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
 m4_define([b4_integral_parser_table_define],
 [  const b4_int_type_for([$2])
 # Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
 m4_define([b4_integral_parser_table_define],
 [  const b4_int_type_for([$2])


@@ -114,92 +113,9 @@ m4_popdef([b4_at_dollar])dnl
 m4_popdef([b4_dollar_dollar])dnl
 ])])
 
 m4_popdef([b4_dollar_dollar])dnl
 ])])
 

-# b4_symbol_constructor_declare_(SYMBOL-NUMBER)
-# ---------------------------------------------
-# Declare the overloaded version of make_symbol for the (common) type of
-# these SYMBOL-NUMBERS.  Use at class-level.
-m4_define([b4_symbol_constructor_declare_],
-[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
-[    static inline
-    symbol_type
-    make_[]b4_symbol_([$1], [id]) (dnl
-b4_args(b4_symbol_if([$1], [has_type],
-                     [const b4_symbol([$1], [type])& v]),
-        b4_locations_if([const location_type& l])));
-
-])])])
-
-
-# b4_symbol_constructor_declare
-# -----------------------------
-# Declare symbol constructors for all the value types.
-# Use at class-level.
-m4_define([b4_symbol_constructor_declare],
-[b4_variant_if([
-    // Symbol constructors declarations.
-b4_symbol_foreach([b4_symbol_constructor_declare_])])])
-
-
-
-# b4_symbol_constructor_define_(SYMBOL-NUMBER)
-# --------------------------------------------
-# Define symbol constructor for this SYMBOL-NUMBER.
-m4_define([b4_symbol_constructor_define_],
-[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
-[  b4_parser_class_name::symbol_type
-  b4_parser_class_name::make_[]b4_symbol_([$1], [id]) (dnl
-b4_args(b4_symbol_if([$1], [has_type],
-                     [const b4_symbol([$1], [type])& v]),
-        b4_locations_if([const location_type& l])))
-  {
-    return symbol_type (b4_args([yytranslate_ (token::b4_symbol([$1], [id]))],
-                                b4_symbol_if([$1], [has_type], [v]),
-                                b4_locations_if([l])));
-  }
-
-])])])
-
-
-# b4_symbol_constructor_define
-# ----------------------------
-# Define the overloaded versions of make_symbol for all the value types.
-m4_define([b4_symbol_constructor_define],
-[b4_variant_if([
-  // Implementation of make_symbol for each symbol type.
-b4_symbol_foreach([b4_symbol_constructor_define_])])])
-
-
-# b4_yytranslate_define
-# ---------------------
-# Define yytranslate_.  Sometimes we want it in the header file,
-# sometimes the cc file suffices.
-m4_define([b4_yytranslate_define],
-[[  // Symbol number corresponding to token number t.
-  ]b4_parser_class_name[::token_number_type
-  ]b4_parser_class_name[::yytranslate_ (]b4_lex_symbol_if([token_type],
-                                                          [int])[ t)
-  {
-    static
-    const token_number_type
-    translate_table[] =
-    {
-]b4_translate[
-    };
-    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<int>(t) <= yyeof_)
-      return yyeof_;
-    else if (static_cast<unsigned int> (t) <= user_token_number_max_)
-      return translate_table[t];
-    else
-      return undef_token_;
-  }
-]])
-

 
 m4_pushdef([b4_copyright_years],
 
 m4_pushdef([b4_copyright_years],

-           [2002, 2003, 2004, 2005, 2006, 2007, 2008])
+           [2002-2012])

 
 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]])])


@@ -208,10 +124,10 @@ m4_define([b4_parser_class_name],
 b4_defines_if([],
               [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
 
 b4_defines_if([],
               [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
 

-b4_locations_if(
-[# Backward compatibility.
-m4_define([b4_location_constructors])
-m4_include(b4_pkgdatadir/[location.cc])])
+b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
+  [# Backward compatibility.
+  m4_define([b4_location_constructors])
+  m4_include(b4_pkgdatadir/[location.cc])])])

 m4_include(b4_pkgdatadir/[stack.hh])
 b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])
 
 m4_include(b4_pkgdatadir/[stack.hh])
 b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])
 


@@ -229,22 +145,21 @@ 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>])[
+]b4_parse_assert_if([#include <cassert>])[
+#include <stdexcept>

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

+]b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
+                                          [[#include "location.hh"]])])[

 
 

-]b4_namespace_open[
-]b4_locations_if([  class position;
-  class location;])[
-]b4_variant_if([b4_variant_define])[
-]b4_namespace_close[
-
-]b4_locations_if([#include "location.hh"])[
+]b4_variant_if([b4_namespace_open
+b4_variant_define
+b4_namespace_close])[

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

-# define YYDEBUG ]b4_debug_flag[
+# define YYDEBUG ]b4_parse_trace_if([1], [0])[

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


@@ -252,7 +167,7 @@ dnl FIXME: This is wrong, we want computed header guards.
 # undef YYERROR_VERBOSE
 # define YYERROR_VERBOSE 1
 #else
 # undef YYERROR_VERBOSE
 # define YYERROR_VERBOSE 1
 #else

-# define YYERROR_VERBOSE ]b4_error_verbose_flag[
+# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[

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


@@ -260,26 +175,6 @@ dnl FIXME: This is wrong, we want computed header guards.
 # define YYTOKEN_TABLE ]b4_token_table[
 #endif
 
 # define YYTOKEN_TABLE ]b4_token_table[
 #endif
 

-]b4_locations_if([dnl
-[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
-#ifndef YYLLOC_DEFAULT
-# 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]])[
-

 ]b4_namespace_open[
 
   /// A Bison parser.
 ]b4_namespace_open[
 
   /// A Bison parser.


@@ -287,7 +182,6 @@ do {                                                            \
   {
   public:
 ]b4_public_types_declare[
   {
   public:
 ]b4_public_types_declare[

-]b4_symbol_constructor_declare[

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


@@ -316,14 +210,27 @@ do {                                                            \
     virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg);
 
   private:
     virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg);
 
   private:

-    /// Generate an error message.
-    /// \param state   the state where the error occurred.
-    /// \param tok     the lookahead token.
-    virtual std::string yysyntax_error_ (int yystate, int tok);
-

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

+    /// Generate an error message.
+    /// \param yystate   the state where the error occurred.
+    /// \param yytoken   the lookahead token.
+    virtual std::string yysyntax_error_ (state_type yystate, int yytoken);
+
+    /// Compute post-reduction state.
+    /// \param yystate   the current state
+    /// \param yylhs     the nonterminal to push on the stack
+    state_type yy_lr_goto_state_ (state_type yystate, int yylhs);
+
+    /// Whether the given \c yypact_ value indicates a defaulted state.
+    /// \param yyvalue   the value to check
+    static bool yy_pact_value_is_default_ (int yyvalue);
+
+    /// Whether the given \c yytable_ value indicates a syntax error.
+    /// \param yyvalue   the value to check
+    static bool yy_table_value_is_error_ (int yyvalue);
+

     /// Internal symbol numbers.
     typedef ]b4_int_type_for([b4_translate])[ token_number_type;
     static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;
     /// Internal symbol numbers.
     typedef ]b4_int_type_for([b4_translate])[ token_number_type;
     static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;


@@ -391,7 +298,7 @@ do {                                                            \
       /// The state.
       state_type state;
 
       /// The state.
       state_type state;
 

-      /// Return the type corresponding to this state.
+      /// The type (corresponding to \a state).

       inline int type_get_ () const;
     };
 
       inline int type_get_ () const;
     };
 


@@ -429,15 +336,14 @@ do {                                                            \
       yyfinal_ = ]b4_final_state_number[, //< Termination state number.
       yyterror_ = 1,
       yyerrcode_ = 256,
       yyfinal_ = ]b4_final_state_number[, //< Termination state number.
       yyterror_ = 1,
       yyerrcode_ = 256,

-      yyntokens_ = ]b4_tokens_number[,   //< Number of tokens.
+      yyntokens_ = ]b4_tokens_number[    //< Number of tokens.

     };
 
 ]b4_parse_param_vars[
   };
 
 ]b4_lex_symbol_if([b4_yytranslate_define
     };
 
 ]b4_parse_param_vars[
   };
 
 ]b4_lex_symbol_if([b4_yytranslate_define

-b4_public_types_define
-b4_symbol_constructor_define])[
+b4_public_types_define])[

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


@@ -469,7 +375,7 @@ m4_if(b4_prefix, [yy], [],
 b4_percent_code_get[]dnl
 
 [#ifndef YY_
 b4_percent_code_get[]dnl
 
 [#ifndef YY_

-# if YYENABLE_NLS
+# if defined YYENABLE_NLS && YYENABLE_NLS

 #  if ENABLE_NLS
 #   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
 #   define YY_(msgid) dgettext ("bison-runtime", msgid)
 #  if ENABLE_NLS
 #   include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
 #   define YY_(msgid) dgettext ("bison-runtime", msgid)


@@ -480,6 +386,27 @@ b4_percent_code_get[]dnl
 # endif
 #endif
 
 # endif
 #endif
 

+]b4_locations_if([dnl
+[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+
+#define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
+#ifndef YYLLOC_DEFAULT
+# define YYLLOC_DEFAULT(Current, Rhs, N)                               \
+ do                                                                    \
+   if (N)                                                              \
+     {                                                                 \
+       (Current).begin = YYRHSLOC (Rhs, 1).begin;                      \
+       (Current).end   = YYRHSLOC (Rhs, N).end;                        \
+     }                                                                 \
+   else                                                                \
+     {                                                                 \
+       (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;        \
+     }                                                                 \
+ while (false)
+#endif]])[
+

 /* Suppress unused-variable warnings by "using" E.  */
 #define YYUSE(e) ((void) (e))
 
 /* Suppress unused-variable warnings by "using" E.  */
 #define YYUSE(e) ((void) (e))
 


@@ -499,14 +426,14 @@ b4_percent_code_get[]dnl
     }                                           \
   } while (false)
 
     }                                           \
   } while (false)
 

-# define YY_REDUCE_PRINT(Rule)         \
-  do {                                 \
+# define YY_REDUCE_PRINT(Rule)          \
+  do {                                  \

     if (yydebug_)                       \
     if (yydebug_)                       \

-      yy_reduce_print_ (Rule);         \
+      yy_reduce_print_ (Rule);          \

   } while (false)
 
   } while (false)
 

-# define YY_STACK_PRINT()              \
-  do {                                 \
+# define YY_STACK_PRINT()               \
+  do {                                  \

     if (yydebug_)                       \
       yystack_print_ ();                \
   } while (false)
     if (yydebug_)                       \
       yystack_print_ ();                \
   } while (false)


@@ -587,8 +514,7 @@ b4_percent_code_get[]dnl
   | Symbol types.  |
   `---------------*/
 
   | Symbol types.  |
   `---------------*/
 

-]b4_lex_symbol_if([], [b4_public_types_define
-b4_symbol_constructor_define])[
+]b4_lex_symbol_if([], [b4_public_types_define])[

 
   // stack_symbol_type.
   ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
 
   // stack_symbol_type.
   ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()


@@ -649,7 +575,7 @@ b4_symbol_constructor_define])[
       {
 ]b4_symbol_foreach([b4_symbol_printer])dnl
 [       default:
       {
 ]b4_symbol_foreach([b4_symbol_printer])dnl
 [       default:

-         break;
+          break;

       }
     yyo << ')';
   }
       }
     yyo << ')';
   }


@@ -722,6 +648,28 @@ b4_symbol_constructor_define])[
   }
 #endif
 
   }
 #endif
 

+  inline ]b4_parser_class_name[::state_type
+  ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs)
+  {
+    int yyr = yypgoto_[yylhs - yyntokens_] + yystate;
+    if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
+      return yytable_[yyr];
+    else
+      return yydefgoto_[yylhs - yyntokens_];
+  }
+
+  inline bool
+  ]b4_parser_class_name[::yy_pact_value_is_default_ (int yyvalue)
+  {
+    return yyvalue == yypact_ninf_;
+  }
+
+  inline bool
+  ]b4_parser_class_name[::yy_table_value_is_error_ (int yyvalue)
+  {
+    return yyvalue == yytable_ninf_;
+  }
+

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


@@ -731,7 +679,6 @@ b4_symbol_constructor_define])[
     /* State.  */
     int yyn;
     int yylen = 0;
     /* State.  */
     int yyn;
     int yylen = 0;

-    int yystate = 0;

 
     /* Error handling.  */
     int yynerrs_ = 0;
 
     /* Error handling.  */
     int yynerrs_ = 0;


@@ -741,7 +688,7 @@ b4_symbol_constructor_define])[
     symbol_type yyla;]b4_locations_if([[
 
     /// The locations where the error started and ended.
     symbol_type yyla;]b4_locations_if([[
 
     /// The locations where the error started and ended.

-    stack_symbol_type yyerror_range[2];]])[
+    stack_symbol_type yyerror_range[3];]])[

 
     /// $$ and @@$.
     stack_symbol_type yylhs;
 
     /// $$ and @@$.
     stack_symbol_type yylhs;


@@ -766,14 +713,12 @@ m4_popdef([b4_at_dollar])])dnl
     yystack_ = stack_type (0);
     yypush_ (0, 0, yyla);
 
     yystack_ = stack_type (0);
     yypush_ (0, 0, yyla);
 

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

   yynewstate:
   yynewstate:

-    YYCDEBUG << "Entering state " << yystate << std::endl;
+    YYCDEBUG << "Entering state " << yystack_[0].state << std::endl;

 
     /* Accept?  */
 
     /* Accept?  */

-    if (yystate == yyfinal_)
+    if (yystack_[0].state == yyfinal_)

       goto yyacceptlab;
 
     goto yybackup;
       goto yyacceptlab;
 
     goto yybackup;


@@ -782,8 +727,8 @@ m4_popdef([b4_at_dollar])])dnl
   yybackup:
 
     /* Try to take a decision without lookahead.  */
   yybackup:
 
     /* Try to take a decision without lookahead.  */

-    yyn = yypact_[yystate];
-    if (yyn == yypact_ninf_)
+    yyn = yypact_[yystack_[0].state];
+    if (yy_pact_value_is_default_ (yyn))

       goto yydefault;
 
     /* Read a lookahead token.  */
       goto yydefault;
 
     /* Read a lookahead token.  */


@@ -794,7 +739,7 @@ m4_popdef([b4_at_dollar])])dnl
 [        yyla = b4_c_function_call([yylex], [symbol_type],
                                    m4_ifdef([b4_lex_param], b4_lex_param));],
 [        yyla.type = yytranslate_ (b4_c_function_call([yylex], [int],
 [        yyla = b4_c_function_call([yylex], [symbol_type],
                                    m4_ifdef([b4_lex_param], b4_lex_param));],
 [        yyla.type = yytranslate_ (b4_c_function_call([yylex], [int],

-                                    [[YYSTYPE*], [&yyla.value]][]dnl
+                                     [[YYSTYPE*], [&yyla.value]][]dnl

 b4_locations_if([, [[location*], [&yyla.location]]])dnl
 m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
         yyempty = false;
 b4_locations_if([, [[location*], [&yyla.location]]])dnl
 m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
         yyempty = false;


@@ -811,10 +756,10 @@ 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 (yy_table_value_is_error_ (yyn))
+          goto yyerrlab;
+        yyn = -yyn;
+        goto yyreduce;

       }
 
     /* Discard the token being shifted.  */
       }
 
     /* Discard the token being shifted.  */


@@ -826,15 +771,14 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
       --yyerrstatus_;
 
     /* Shift the lookahead token.  */
       --yyerrstatus_;
 
     /* Shift the lookahead token.  */

-    yystate = yyn;
-    yypush_ ("Shifting", yystate, yyla);
+    yypush_ ("Shifting", yyn, yyla);

     goto yynewstate;
 
   /*-----------------------------------------------------------.
   | yydefault -- do the default action for the current state.  |
   `-----------------------------------------------------------*/
   yydefault:
     goto yynewstate;
 
   /*-----------------------------------------------------------.
   | yydefault -- do the default action for the current state.  |
   `-----------------------------------------------------------*/
   yydefault:

-    yyn = yydefact_[yystate];
+    yyn = yydefact_[yystack_[0].state];

     if (yyn == 0)
       goto yyerrlab;
     goto yyreduce;
     if (yyn == 0)
       goto yyerrlab;
     goto yyreduce;


@@ -843,11 +787,12 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
   | yyreduce -- Do a reduction.  |
   `-----------------------------*/
   yyreduce:
   | yyreduce -- Do a reduction.  |
   `-----------------------------*/
   yyreduce:

-    yylen = yyr2_[yyn];]b4_variant_if([
+    yylen = yyr2_[yyn];
+    yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([

     /* Variants are always initialized to an empty instance of the
        correct type. The default $$=$1 action is NOT applied when using
        variants.  */
     /* Variants are always initialized to an empty instance of the
        correct type. The default $$=$1 action is NOT applied when using
        variants.  */

-    ]b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [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.
 


@@ -868,21 +813,21 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
 
     // Perform the reduction.
     YY_REDUCE_PRINT (yyn);
 
     // Perform the reduction.
     YY_REDUCE_PRINT (yyn);

-    switch (yyn)
+    try
+    {
+      switch (yyn)

       {
 ]b4_user_actions[
       {
 ]b4_user_actions[

-       default:
+        default:

           break;
       }
           break;
       }

-    // 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;
+    }
+    catch (const syntax_error& yyexc)
+    {
+      error (]b4_args(b4_locations_if([yyexc.location]),
+                      [[yyexc.what()]])[);
+      YYERROR;
+    }

     YY_SYMBOL_PRINT ("-> $$ =", yylhs);
 ]b4_variant_if([[
     // Destroy the rhs symbols.
     YY_SYMBOL_PRINT ("-> $$ =", yylhs);
 ]b4_variant_if([[
     // Destroy the rhs symbols.


@@ -914,26 +859,27 @@ 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 (]b4_args(b4_locations_if([yyla.location]),
-                        [yysyntax_error_ (yystate, yyla.type)])[);
+        ++yynerrs_;
+        error (]b4_args(b4_locations_if([yyla.location]),
+                        [[yysyntax_error_ (yystack_[0].state,
+                                           yyempty ? yyempty_ : yyla.type)]])[);

       }
 
 ]b4_locations_if([[
       }
 
 ]b4_locations_if([[

-    yyerror_range[0].location = yyla.location;]])[
+    yyerror_range[1].location = yyla.location;]])[

     if (yyerrstatus_ == 3)
       {
     if (yyerrstatus_ == 3)
       {

-       /* If just tried and failed to reuse lookahead token after an
+        /* If just tried and failed to reuse lookahead token after an

            error, discard it.  */
 
         /* Return failure if at end of input.  */
         if (yyla.type == yyeof_)
           YYABORT;
            error, discard it.  */
 
         /* Return failure if at end of input.  */
         if (yyla.type == yyeof_)
           YYABORT;

-        else
+        else if (!yyempty)

           {
             yy_destroy_ ("Error: discarding", yyla);
             yyempty = true;
           {
             yy_destroy_ ("Error: discarding", yyla);
             yyempty = true;

-         }
+          }

       }
 
     /* Else will try to reuse lookahead token after shifting the error
       }
 
     /* Else will try to reuse lookahead token after shifting the error


@@ -950,28 +896,27 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
        YYERROR and the label yyerrorlab therefore never appears in user
        code.  */
     if (false)
        YYERROR and the label yyerrorlab therefore never appears in user
        code.  */
     if (false)

-      goto yyerrorlab;
-
-]b4_locations_if([[
-    yyerror_range[0].location = yystack_[yylen - 1].location;]])[
+      goto yyerrorlab;]b4_locations_if([[
+    yyerror_range[1].location = yystack_[yylen - 1].location;]])b4_variant_if([[
+    /* $$ was initialized before running the user action.  */
+    yy_destroy_ ("Error: discarding", yylhs);]])[

     /* 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 = yystack_[0].state;

     goto yyerrlab1;
 
   /*-------------------------------------------------------------.
   | yyerrlab1 -- common code for both syntax error and YYERROR.  |
   `-------------------------------------------------------------*/
   yyerrlab1:
     goto yyerrlab1;
 
   /*-------------------------------------------------------------.
   | yyerrlab1 -- common code for both syntax error and YYERROR.  |
   `-------------------------------------------------------------*/
   yyerrlab1:

-    yyerrstatus_ = 3;  /* Each real token shifted decrements this.  */
+    yyerrstatus_ = 3;   /* Each real token shifted decrements this.  */

     {
       stack_symbol_type error_token;
       for (;;)
         {
     {
       stack_symbol_type error_token;
       for (;;)
         {

-          yyn = yypact_[yystate];
-          if (yyn != yypact_ninf_)
+          yyn = yypact_[yystack_[0].state];
+          if (!yy_pact_value_is_default_ (yyn))

             {
               yyn += yyterror_;
               if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
             {
               yyn += yyterror_;
               if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)


@@ -986,18 +931,17 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
           if (yystack_.size () == 1)
             YYABORT;
 ]b4_locations_if([[
           if (yystack_.size () == 1)
             YYABORT;
 ]b4_locations_if([[

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

           yy_destroy_ ("Error: popping", yystack_[0]);
           yypop_ ();
           yy_destroy_ ("Error: popping", yystack_[0]);
           yypop_ ();

-          yystate = yystack_[0].state;

           YY_STACK_PRINT ();
         }
 ]b4_locations_if([[
           YY_STACK_PRINT ();
         }
 ]b4_locations_if([[

-      yyerror_range[1].location = yyla.location;
-      YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);]])[
+      yyerror_range[2].location = yyla.location;
+      YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[

 
       /* Shift the error token.  */
 
       /* Shift the error token.  */

-      error_token.state = yystate = yyn;
+      error_token.state = yyn;

       yypush_ ("Shifting", error_token);
     }
     goto yynewstate;
       yypush_ ("Shifting", error_token);
     }
     goto yynewstate;


@@ -1021,8 +965,8 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
     yypop_ (yylen);
     while (yystack_.size () != 1)
       {
     yypop_ (yylen);
     while (yystack_.size () != 1)
       {

-       yy_destroy_ ("Cleanup: popping", yystack_[0]);
-       yypop_ ();
+        yy_destroy_ ("Cleanup: popping", yystack_[0]);
+        yypop_ ();

       }
 
     return yyresult;
       }
 
     return yyresult;


@@ -1031,70 +975,99 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
   // Generate an error message.
   std::string
   ]b4_parser_class_name[::yysyntax_error_ (]dnl
   // Generate an error message.
   std::string
   ]b4_parser_class_name[::yysyntax_error_ (]dnl

-b4_error_verbose_if([int yystate, int yytoken],
+b4_error_verbose_if([state_type yystate, int yytoken],

                     [int, int])[)
                     [int, int])[)

-  {
-    std::string yyres;]b4_error_verbose_if([[
-    int yyn = yypact_[yystate];
-    if (yypact_ninf_ < yyn && yyn <= yylast_)
+  {]b4_error_verbose_if([[
+    std::string yyres;
+    // Number of reported tokens (one for the "unexpected", one per
+    // "expected").
+    size_t yycount = 0;
+    // Its maximum.
+    enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
+    // Arguments of yyformat.
+    char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
+
+    /* There are many possibilities here to consider:
+       - If this state is a consistent state with a default action, then
+         the only way this function was invoked is if the default action
+         is an error action.  In that case, don't check for expected
+         tokens because there are none.
+       - The only way there can be no lookahead present (in yytoken) is
+         if this state is a consistent state with a default action.
+         Thus, detecting the absence of a lookahead is sufficient to
+         determine that there is no unexpected or expected token to
+         report.  In that case, just report a simple "syntax error".
+       - Don't assume there isn't a lookahead just because this state is
+         a consistent state with a default action.  There might have
+         been a previous inconsistent state, consistent state with a
+         non-default action, or user semantic action that manipulated
+         yyla.  (However, yyla is currently not documented for users.)
+       - Of course, the expected token list depends on states to have
+         correct lookahead information, and it depends on the parser not
+         to perform extra reductions after fetching a lookahead from the
+         scanner and before detecting a syntax error.  Thus, state
+         merging (from LALR or IELR) and default reductions corrupt the
+         expected token list.  However, the list is correct for
+         canonical LR with one exception: it will still contain any
+         token that will not be accepted due to an error action in a
+         later state.
+    */
+    if (yytoken != yyempty_)

       {
       {

-       /* 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_;
-
-        // Number of reported tokens (one for the "unexpected", one per
-        // "expected").
-       size_t yycount = 0;
-        // Its maximum.
-        enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
-        // Arguments of yyformat.
-        char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];

         yyarg[yycount++] = yytname_[yytoken];
         yyarg[yycount++] = yytname_[yytoken];

-       for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
-         if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_)
+        int yyn = yypact_[yystate];
+        if (!yy_pact_value_is_default_ (yyn))

           {
           {

-            if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
-            {
-              yycount = 1;
-              break;
-            }
-            else
-              yyarg[yycount++] = yytname_[yyx];
+            /* Start YYX at -YYN if negative to avoid negative indexes in
+               YYCHECK.  In other words, skip the first -YYN actions for
+               this state because they are default actions.  */
+            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_;
+            for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
+              if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_
+                  && !yy_table_value_is_error_ (yytable_[yyx + yyn]))
+                {
+                  if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
+                    {
+                      yycount = 1;
+                      break;
+                    }
+                  else
+                    yyarg[yycount++] = yytname_[yyx];
+                }

           }
           }

+      }

 
 

-        char const* yyformat = 0;
-        switch (yycount)
-        {
-#define YYCASE_(N, S)                           \
-          case N:                               \
-            yyformat = S;                       \
-          break
-          YYCASE_(1, YY_("syntax error, unexpected %s"));
-          YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
-          YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
-          YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
-          YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
+    char const* yyformat = 0;
+    switch (yycount)
+      {
+#define YYCASE_(N, S)                         \
+        case N:                               \
+          yyformat = S;                       \
+        break
+        YYCASE_(0, YY_("syntax error"));
+        YYCASE_(1, YY_("syntax error, unexpected %s"));
+        YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
+        YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
+        YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
+        YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));

 #undef YYCASE_
 #undef YYCASE_

-        }
-        // Argument number.
-        size_t yyi = 0;
-        for (char const* yyp = yyformat; *yyp; ++yyp)
-          if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
-          {
-            yyres += yytnamerr_ (yyarg[yyi++]);
-            ++yyp;
-          }
-          else
-            yyres += *yyp;

       }
       }

-    else
-  ]])dnl
-[    yyres = YY_("syntax error");
-    return yyres;
+
+    // Argument number.
+    size_t yyi = 0;
+    for (char const* yyp = yyformat; *yyp; ++yyp)
+      if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
+        {
+          yyres += yytnamerr_ (yyarg[yyi++]);
+          ++yyp;
+        }
+      else
+        yyres += *yyp;
+    return yyres;]], [[
+    return YY_("syntax error");]])[

   }
 
 
   }
 
 


@@ -1125,7 +1098,7 @@ b4_error_verbose_if([int yystate, int yytoken],
     for (stack_type::const_iterator
            i = yystack_.begin (),
            i_end = yystack_.end ();
     for (stack_type::const_iterator
            i = yystack_.begin (),
            i_end = yystack_.end ();

-        i != i_end; ++i)
+         i != i_end; ++i)

       *yycdebug_ << ' ' << i->state;
     *yycdebug_ << std::endl;
   }
       *yycdebug_ << ' ' << i->state;
     *yycdebug_ << std::endl;
   }


@@ -1138,7 +1111,7 @@ b4_error_verbose_if([int yystate, int yytoken],
     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 << "):" << std::endl;
+               << " (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 << " =",