]> git.saurik.com Git - bison.git/blobdiff - data/yacc.c
c++: more YY_NULL
[bison.git] / data / yacc.c
index d18b2698912de1f469e25eb60d11768200d6ca1f..cb6d8e59899ff8150447b64f4c418b827f58f949 100644 (file)
@@ -1,10 +1,12 @@
                                                              -*- C -*-
-
 # Yacc compatible skeleton for Bison
 
 # Copyright (C) 1984, 1989-1990, 2000-2012 Free Software Foundation,
 # Inc.
 
+m4_pushdef([b4_copyright_years],
+           [1984, 1989-1990, 2000-2012])
+
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
@@ -74,8 +76,8 @@ m4_define([b4_pure_flag],
 # Expand IF-TRUE, if %pure-parser and %parse-param, IF-FALSE otherwise.
 m4_define([b4_yacc_pure_if],
 [b4_pure_if([m4_ifset([b4_parse_param],
-                     [$1], [$2])],
-           [$2])])
+                      [$1], [$2])],
+            [$2])])
 
 
 # b4_yyerror_args
@@ -115,7 +117,7 @@ m4_define([b4_int_type],
 
        m4_eval([0 <= $1]),                [1], [unsigned int],
 
-                                              [int])])
+                                               [int])])
 
 
 ## ----------------- ##
@@ -127,7 +129,7 @@ m4_define([b4_int_type],
 # --------------------
 # Expansion of $<TYPE>$.
 m4_define([b4_lhs_value],
-[(yyval[]m4_ifval([$1], [.$1]))])
+[b4_symbol_value(yyval, [$1])])
 
 
 # b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
@@ -135,7 +137,7 @@ m4_define([b4_lhs_value],
 # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
 # symbols on RHS.
 m4_define([b4_rhs_value],
-[(yyvsp@{($2) - ($1)@}m4_ifval([$3], [.$3]))])
+          [b4_symbol_value([yyvsp@{b4_subtract([$2], [$1])@}], [$3])])
 
 
 
@@ -155,7 +157,7 @@ m4_define([b4_lhs_location],
 # Expansion of @NUM, where the current rule has RULE-LENGTH symbols
 # on RHS.
 m4_define([b4_rhs_location],
-[(yylsp@{($2) - ($1)@})])
+          [(yylsp@{b4_subtract([$2], [$1])@})])
 
 
 ## ------------------ ##
@@ -233,8 +235,7 @@ m4_define([b4_declare_parser_state_variables], [b4_pure_if([[
 m4_changecom()
 m4_divert_push(0)dnl
 @output(b4_parser_file_name@)@
-b4_copyright([Bison implementation for Yacc-like parsers in C],
-             [1984, 1989-1990, 2000-2011])[
+b4_copyright([Bison implementation for Yacc-like parsers in C])[
 
 /* C LALR(1) parser skeleton written by Richard Stallman, by
    simplifying the original so-called "semantic" parser.  */
@@ -267,9 +268,11 @@ m4_if(b4_prefix, [yy], [],
 /* Copy the first part of user declarations.  */
 ]b4_user_pre_prologue[
 
+]b4_null_define[
+
 /* Enabling traces.  */
 #ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
+# define YYDEBUG ]b4_parse_trace_if([1], [0])[
 #endif
 
 /* Enabling verbose error messages.  */
@@ -277,7 +280,7 @@ m4_if(b4_prefix, [yy], [],
 # 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.  */
@@ -464,7 +467,7 @@ b4_push_if([], [b4_lac_if([], [[
 #  endif
 #  if (defined __cplusplus && ! defined EXIT_SUCCESS \
        && ! ((defined YYMALLOC || defined malloc) \
-            && (defined YYFREE || defined free)))
+             && (defined YYFREE || defined free)))
 #   include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
 #   ifndef EXIT_SUCCESS
 #    define EXIT_SUCCESS 0
@@ -489,8 +492,8 @@ void free (void *); /* INFRINGES ON USER NAME SPACE */
 
 #if (! defined yyoverflow \
      && (! defined __cplusplus \
-        || (]b4_locations_if([[defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL \
-            && ]])[defined YYSTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL)))
+         || (]b4_locations_if([[defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL \
+             && ]])[defined YYSTYPE_IS_TRIVIAL && YYSTYPE_IS_TRIVIAL)))
 
 /* A type that is properly aligned for any stack member.  */
 union yyalloc
@@ -520,34 +523,34 @@ union yyalloc
    elements in the stack, and YYPTR gives the new location of the
    stack.  Advance YYPTR to a properly aligned location for the next
    stack.  */
-# define YYSTACK_RELOCATE(Stack_alloc, Stack)                          \
-    do                                                                 \
-      {                                                                        \
-       YYSIZE_T yynewbytes;                                            \
-       YYCOPY (&yyptr->Stack_alloc, Stack, yysize);                    \
-       Stack = &yyptr->Stack_alloc;                                    \
-       yynewbytes = yystacksize * sizeof (*Stack) + YYSTACK_GAP_MAXIMUM; \
-       yyptr += yynewbytes / sizeof (*yyptr);                          \
-      }                                                                        \
+# define YYSTACK_RELOCATE(Stack_alloc, Stack)                           \
+    do                                                                  \
+      {                                                                 \
+        YYSIZE_T yynewbytes;                                            \
+        YYCOPY (&yyptr->Stack_alloc, Stack, yysize);                    \
+        Stack = &yyptr->Stack_alloc;                                    \
+        yynewbytes = yystacksize * sizeof (*Stack) + YYSTACK_GAP_MAXIMUM; \
+        yyptr += yynewbytes / sizeof (*yyptr);                          \
+      }                                                                 \
     while (YYID (0))
 
 #endif
 
 #if defined YYCOPY_NEEDED && YYCOPY_NEEDED
-/* Copy COUNT objects from FROM to TO.  The source and destination do
+/* Copy COUNT objects from SRC to DST.  The source and destination do
    not overlap.  */
 # ifndef YYCOPY
 #  if defined __GNUC__ && 1 < __GNUC__
-#   define YYCOPY(To, From, Count) \
-      __builtin_memcpy (To, From, (Count) * sizeof (*(From)))
+#   define YYCOPY(Dst, Src, Count) \
+      __builtin_memcpy (Dst, Src, (Count) * sizeof (*(Src)))
 #  else
-#   define YYCOPY(To, From, Count)             \
-      do                                       \
-       {                                       \
-         YYSIZE_T yyi;                         \
-         for (yyi = 0; yyi < (Count); yyi++)   \
-           (To)[yyi] = (From)[yyi];            \
-       }                                       \
+#   define YYCOPY(Dst, Src, Count)              \
+      do                                        \
+        {                                       \
+          YYSIZE_T yyi;                         \
+          for (yyi = 0; yyi < (Count); yyi++)   \
+            (Dst)[yyi] = (Src)[yyi];            \
+        }                                       \
       while (YYID (0))
 #  endif
 # endif
@@ -564,41 +567,27 @@ union yyalloc
 #define YYNNTS  ]b4_nterms_number[
 /* YYNRULES -- Number of rules.  */
 #define YYNRULES  ]b4_rules_number[
-/* YYNRULES -- Number of states.  */
+/* YYNSTATES -- Number of states.  */
 #define YYNSTATES  ]b4_states_number[
 
-/* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
+/* YYTRANSLATE[YYX] -- Symbol number corresponding to YYX as returned
+   by yylex, with out-of-bounds checking.  */
 #define YYUNDEFTOK  ]b4_undef_token_number[
 #define YYMAXUTOK   ]b4_user_token_number_max[
 
-#define YYTRANSLATE(YYX)                                               \
+#define YYTRANSLATE(YYX)                                                \
   ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)
 
-/* YYTRANSLATE[YYLEX] -- Bison symbol number corresponding to YYLEX.  */
+/* YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to TOKEN-NUM
+   as returned by yylex, without out-of-bounds checking.  */
 static const ]b4_int_type_for([b4_translate])[ yytranslate[] =
 {
   ]b4_translate[
 };
 
 #if YYDEBUG
-/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
-   YYRHS.  */
-static const ]b4_int_type_for([b4_prhs])[ yyprhs[] =
-{
-  ]b4_prhs[
-};
-
-/* YYRHS -- A `-1'-separated list of the rules' RHS.  */
-static const ]b4_int_type_for([b4_rhs])[ yyrhs[] =
-{
-  ]b4_rhs[
-};
-
-/* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
-static const ]b4_int_type_for([b4_rline])[ yyrline[] =
-{
-  ]b4_rline[
-};
+]b4_integral_parser_table_define([rline], [b4_rline],
+     [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[
 #endif
 
 #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
@@ -611,89 +600,34 @@ static const char *const yytname[] =
 #endif
 
 # ifdef YYPRINT
-/* YYTOKNUM[YYLEX-NUM] -- Internal token number corresponding to
-   token YYLEX-NUM.  */
+/* YYTOKNUM[NUM] -- (External) token number corresponding to the
+   (internal) symbol number NUM (which must be that of a token).  */
 static const ]b4_int_type_for([b4_toknum])[ yytoknum[] =
 {
   ]b4_toknum[
 };
 # endif
 
-/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
-static const ]b4_int_type_for([b4_r1])[ yyr1[] =
-{
-  ]b4_r1[
-};
-
-/* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
-static const ]b4_int_type_for([b4_r2])[ yyr2[] =
-{
-  ]b4_r2[
-};
-
-/* YYDEFACT[STATE-NAME] -- Default reduction number in state STATE-NUM.
-   Performed when YYTABLE doesn't specify something else to do.  Zero
-   means the default is an error.  */
-static const ]b4_int_type_for([b4_defact])[ yydefact[] =
-{
-  ]b4_defact[
-};
-
-/* YYDEFGOTO[NTERM-NUM].  */
-static const ]b4_int_type_for([b4_defgoto])[ yydefgoto[] =
-{
-  ]b4_defgoto[
-};
-
-/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
-   STATE-NUM.  */
 #define YYPACT_NINF ]b4_pact_ninf[
-static const ]b4_int_type_for([b4_pact])[ yypact[] =
-{
-  ]b4_pact[
-};
-
-/* YYPGOTO[NTERM-NUM].  */
-static const ]b4_int_type_for([b4_pgoto])[ yypgoto[] =
-{
-  ]b4_pgoto[
-};
-
-/* 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 YYTABLE_NINF, syntax error.  */
-#define YYTABLE_NINF ]b4_table_ninf[
-static const ]b4_int_type_for([b4_table])[ yytable[] =
-{
-  ]b4_table[
-};
 
 #define yypact_value_is_default(yystate) \
   ]b4_table_value_equals([[pact]], [[yystate]], [b4_pact_ninf])[
 
+#define YYTABLE_NINF ]b4_table_ninf[
+
 #define yytable_value_is_error(yytable_value) \
   ]b4_table_value_equals([[table]], [[yytable_value]], [b4_table_ninf])[
 
-static const ]b4_int_type_for([b4_check])[ yycheck[] =
-{
-  ]b4_check[
-};
+]b4_parser_tables_define[
 
-/* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
-   symbol of state STATE-NUM.  */
-static const ]b4_int_type_for([b4_stos])[ yystos[] =
-{
-  ]b4_stos[
-};
+#define yyerrok         (yyerrstatus = 0)
+#define yyclearin       (yychar = YYEMPTY)
+#define YYEMPTY         (-2)
+#define YYEOF           0
 
-#define yyerrok                (yyerrstatus = 0)
-#define yyclearin      (yychar = YYEMPTY)
-#define YYEMPTY                (-2)
-#define YYEOF          0
-
-#define YYACCEPT       goto yyacceptlab
-#define YYABORT                goto yyabortlab
-#define YYERROR                goto yyerrorlab
+#define YYACCEPT        goto yyacceptlab
+#define YYABORT         goto yyabortlab
+#define YYERROR         goto yyerrorlab
 
 
 /* Like YYERROR except do call yyerror.  This remains here temporarily
@@ -703,7 +637,7 @@ static const ]b4_int_type_for([b4_stos])[ yystos[] =
    in Bison 2.4.2's NEWS entry, where a plan to phase it out is
    discussed.  */
 
-#define YYFAIL         goto yyerrlab
+#define YYFAIL          goto yyerrlab
 #if defined YYFAIL
   /* This is here to suppress warnings from the GCC cpp's
      -Wunused-macros.  Normally we don't worry about that warning, but
@@ -727,13 +661,13 @@ do                                                              \
   else                                                          \
     {                                                           \
       yyerror (]b4_yyerror_args[YY_("syntax error: cannot back up")); \
-      YYERROR;                                                 \
-    }                                                          \
+      YYERROR;                                                  \
+    }                                                           \
 while (YYID (0))
 
 
-#define YYTERROR       1
-#define YYERRCODE      256
+#define YYTERROR        1
+#define YYERRCODE       256
 
 
 /* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
@@ -742,22 +676,22 @@ while (YYID (0))
 
 #define YYRHSLOC(Rhs, K) ((Rhs)[K])
 #ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N)                               \
-    do                                                                 \
+# define YYLLOC_DEFAULT(Current, Rhs, N)                                \
+    do                                                                  \
       if (YYID (N))                                                    \
-       {                                                               \
-         (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
-         (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
-         (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
-         (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
-       }                                                               \
-      else                                                             \
-       {                                                               \
-         (Current).first_line   = (Current).last_line   =              \
-           YYRHSLOC (Rhs, 0).last_line;                                \
-         (Current).first_column = (Current).last_column =              \
-           YYRHSLOC (Rhs, 0).last_column;                              \
-       }                                                               \
+        {                                                               \
+          (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
+          (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
+          (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
+          (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
+        }                                                               \
+      else                                                              \
+        {                                                               \
+          (Current).first_line   = (Current).last_line   =              \
+            YYRHSLOC (Rhs, 0).last_line;                                \
+          (Current).first_column = (Current).last_column =              \
+            YYRHSLOC (Rhs, 0).last_column;                              \
+        }                                                               \
     while (YYID (0))
 #endif]b4_locations_if([[
 
@@ -768,10 +702,10 @@ while (YYID (0))
 
 #ifndef YY_LOCATION_PRINT
 # if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
-#  define YY_LOCATION_PRINT(File, Loc)                 \
-     fprintf (File, "%d.%d-%d.%d",                     \
-             (Loc).first_line, (Loc).first_column,     \
-             (Loc).last_line,  (Loc).last_column)
+#  define YY_LOCATION_PRINT(File, Loc)                  \
+     fprintf (File, "%d.%d-%d.%d",                      \
+              (Loc).first_line, (Loc).first_column,     \
+              (Loc).last_line,  (Loc).last_column)
 # else
 #  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
 # endif
@@ -801,21 +735,21 @@ while (YYID (0))
 #  define YYFPRINTF fprintf
 # endif
 
-# define YYDPRINTF(Args)                       \
-do {                                           \
-  if (yydebug)                                 \
-    YYFPRINTF Args;                            \
+# define YYDPRINTF(Args)                        \
+do {                                            \
+  if (yydebug)                                  \
+    YYFPRINTF Args;                             \
 } while (YYID (0))
 
-# define YY_SYMBOL_PRINT(Title, Type, Value, Location)                   \
-do {                                                                     \
-  if (yydebug)                                                           \
-    {                                                                    \
-      YYFPRINTF (stderr, "%s ", Title);                                          \
-      yy_symbol_print (stderr,                                           \
-                 Type, Value]b4_locations_if([, Location])[]b4_user_args[); \
-      YYFPRINTF (stderr, "\n");                                                  \
-    }                                                                    \
+# define YY_SYMBOL_PRINT(Title, Type, Value, Location)                    \
+do {                                                                      \
+  if (yydebug)                                                            \
+    {                                                                     \
+      YYFPRINTF (stderr, "%s ", Title);                                   \
+      yy_symbol_print (stderr,                                            \
+                  Type, Value]b4_locations_if([, Location])[]b4_user_args[); \
+      YYFPRINTF (stderr, "\n");                                           \
+    }                                                                     \
 } while (YYID (0))
 
 ]b4_yy_symbol_print_generate([b4_c_function_def])[
@@ -826,8 +760,8 @@ do {                                                                          \
 `------------------------------------------------------------------*/
 
 ]b4_c_function_def([yy_stack_print], [static void],
-                  [[yytype_int16 *yybottom], [yybottom]],
-                  [[yytype_int16 *yytop],    [yytop]])[
+                   [[yytype_int16 *yybottom], [yybottom]],
+                   [[yytype_int16 *yytop],    [yytop]])[
 {
   YYFPRINTF (stderr, "Stack now");
   for (; yybottom <= yytop; yybottom++)
@@ -838,10 +772,10 @@ do {                                                                        \
   YYFPRINTF (stderr, "\n");
 }
 
-# define YY_STACK_PRINT(Bottom, Top)                           \
-do {                                                           \
-  if (yydebug)                                                 \
-    yy_stack_print ((Bottom), (Top));                          \
+# define YY_STACK_PRINT(Bottom, Top)                            \
+do {                                                            \
+  if (yydebug)                                                  \
+    yy_stack_print ((Bottom), (Top));                           \
 } while (YYID (0))
 
 
@@ -850,32 +784,34 @@ do {                                                              \
 `------------------------------------------------*/
 
 ]b4_c_function_def([yy_reduce_print], [static void],
-                  [[YYSTYPE *yyvsp], [yyvsp]],
+                   [[yytype_int16 *yyssp], [yyssp]],
+                   [[YYSTYPE *yyvsp], [yyvsp]],
     b4_locations_if([[[YYLTYPE *yylsp], [yylsp]],
-                  ])[[int yyrule], [yyrule]]m4_ifset([b4_parse_param], [,
-                  b4_parse_param]))[
+                   ])[[int yyrule], [yyrule]]m4_ifset([b4_parse_param], [,
+                   b4_parse_param]))[
 {
+  unsigned long int yylno = yyrline[yyrule];
   int yynrhs = yyr2[yyrule];
   int yyi;
-  unsigned long int yylno = yyrline[yyrule];
   YYFPRINTF (stderr, "Reducing stack by rule %d (line %lu):\n",
-            yyrule - 1, yylno);
+             yyrule - 1, yylno);
   /* The symbols being reduced.  */
   for (yyi = 0; yyi < yynrhs; yyi++)
     {
       YYFPRINTF (stderr, "   $%d = ", yyi + 1);
-      yy_symbol_print (stderr, yyrhs[yyprhs[yyrule] + yyi],
-                      &]b4_rhs_value(yynrhs, yyi + 1)[
-                      ]b4_locations_if([, &]b4_rhs_location(yynrhs, yyi + 1))[]dnl
-                      b4_user_args[);
+      yy_symbol_print (stderr,
+                       yystos[yyssp[yyi + 1 - yynrhs]],
+                       &]b4_rhs_value(yynrhs, yyi + 1)[
+                       ]b4_locations_if([, &]b4_rhs_location(yynrhs, yyi + 1))[]dnl
+                       b4_user_args[);
       YYFPRINTF (stderr, "\n");
     }
 }
 
-# define YY_REDUCE_PRINT(Rule)         \
-do {                                   \
-  if (yydebug)                         \
-    yy_reduce_print (yyvsp, ]b4_locations_if([yylsp, ])[Rule]b4_user_args[); \
+# define YY_REDUCE_PRINT(Rule)          \
+do {                                    \
+  if (yydebug)                          \
+    yy_reduce_print (yyssp, yyvsp, ]b4_locations_if([yylsp, ])[Rule]b4_user_args[); \
 } while (YYID (0))
 
 /* Nonzero means print parse trace.  It is left uninitialized so that
@@ -890,7 +826,7 @@ int yydebug;
 
 
 /* YYINITDEPTH -- initial size of the parser's stacks.  */
-#ifndef        YYINITDEPTH
+#ifndef YYINITDEPTH
 # define YYINITDEPTH ]b4_stack_depth_init[
 #endif
 
@@ -1197,27 +1133,27 @@ yytnamerr (char *yyres, const char *yystr)
       char const *yyp = yystr;
 
       for (;;)
-       switch (*++yyp)
-         {
-         case '\'':
-         case ',':
-           goto do_not_strip_quotes;
-
-         case '\\':
-           if (*++yyp != '\\')
-             goto do_not_strip_quotes;
-           /* Fall through.  */
-         default:
-           if (yyres)
-             yyres[yyn] = *yyp;
-           yyn++;
-           break;
-
-         case '"':
-           if (yyres)
-             yyres[yyn] = '\0';
-           return yyn;
-         }
+        switch (*++yyp)
+          {
+          case '\'':
+          case ',':
+            goto do_not_strip_quotes;
+
+          case '\\':
+            if (*++yyp != '\\')
+              goto do_not_strip_quotes;
+            /* Fall through.  */
+          default:
+            if (yyres)
+              yyres[yyn] = *yyp;
+            yyn++;
+            break;
+
+          case '"':
+            if (yyres)
+              yyres[yyn] = '\0';
+            return yyn;
+          }
     do_not_strip_quotes: ;
     }
 
@@ -1243,12 +1179,12 @@ yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
                 ]b4_lac_if([[yytype_int16 *yyesa, yytype_int16 **yyes,
                 YYSIZE_T *yyes_capacity, ]])[yytype_int16 *yyssp, int yytoken)
 {
-  YYSIZE_T yysize0 = yytnamerr (0, yytname[yytoken]);
+  YYSIZE_T yysize0 = yytnamerr (YY_NULL, yytname[yytoken]);
   YYSIZE_T yysize = yysize0;
   YYSIZE_T yysize1;
   enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
   /* Internationalized format string. */
-  const char *yyformat = 0;
+  const char *yyformat = YY_NULL;
   /* Arguments of yyformat. */
   char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
   /* Number of reported tokens (one for the "unexpected", one per
@@ -1326,7 +1262,7 @@ yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
                     break;
                   }
                 yyarg[yycount++] = yytname[yyx];
-                yysize1 = yysize + yytnamerr (0, yytname[yyx]);
+                yysize1 = yysize + yytnamerr (YY_NULL, yytname[yyx]);
                 if (! (yysize <= yysize1
                        && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
                   return 2;
@@ -1415,7 +1351,7 @@ static char yypstate_allocated = 0;]])b4_pull_if([
 
 b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
 {
-  return yypull_parse (0]m4_ifset([b4_parse_param],
+  return yypull_parse (YY_NULL]m4_ifset([b4_parse_param],
                                   [[, ]b4_c_args(b4_parse_param)])[);
 }
 
@@ -1428,7 +1364,9 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
   int yychar;
   YYSTYPE yylval;]b4_locations_if([[
   YYLTYPE yylloc;]])])[
-  if (yyps == 0)
+  if (yyps)
+    yyps_local = yyps;
+  else
     {
       yyps_local = yypstate_new ();
       if (!yyps_local)
@@ -1439,14 +1377,12 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
           return 2;
         }
     }
-  else
-    yyps_local = yyps;
   do {
     yychar = YYLEX;
     yystatus =
       yypush_parse (yyps_local]b4_pure_if([[, yychar, &yylval]b4_locations_if([[, &yylloc]])])m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])[);
   } while (yystatus == YYPUSH_MORE);
-  if (yyps == 0)
+  if (!yyps)
     yypstate_delete (yyps_local);
   return yystatus;
 }]])[
@@ -1456,10 +1392,10 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
 {
   yypstate *yyps;]b4_pure_if([], [[
   if (yypstate_allocated)
-    return 0;]])[
+    return YY_NULL;]])[
   yyps = (yypstate *) malloc (sizeof *yyps);
   if (!yyps)
-    return 0;
+    return YY_NULL;
   yyps->yynew = 1;]b4_pure_if([], [[
   yypstate_allocated = 1;]])[
   return yyps;
@@ -1620,26 +1556,26 @@ m4_ifdef([b4_at_dollar_used], [[  yylsp[0] = yylloc;
 
 #ifdef yyoverflow
       {
-       /* Give user a chance to reallocate the stack.  Use copies of
-          these so that the &'s don't force the real ones into
-          memory.  */
-       YYSTYPE *yyvs1 = yyvs;
-       yytype_int16 *yyss1 = yyss;]b4_locations_if([
-       YYLTYPE *yyls1 = yyls;])[
-
-       /* Each stack pointer address is followed by the size of the
-          data in use in that stack, in bytes.  This used to be a
-          conditional around just the two extra args, but that might
-          be undefined if yyoverflow is a macro.  */
-       yyoverflow (YY_("memory exhausted"),
-                   &yyss1, yysize * sizeof (*yyssp),
-                   &yyvs1, yysize * sizeof (*yyvsp),]b4_locations_if([
-                   &yyls1, yysize * sizeof (*yylsp),])[
-                   &yystacksize);
+        /* Give user a chance to reallocate the stack.  Use copies of
+           these so that the &'s don't force the real ones into
+           memory.  */
+        YYSTYPE *yyvs1 = yyvs;
+        yytype_int16 *yyss1 = yyss;]b4_locations_if([
+        YYLTYPE *yyls1 = yyls;])[
+
+        /* Each stack pointer address is followed by the size of the
+           data in use in that stack, in bytes.  This used to be a
+           conditional around just the two extra args, but that might
+           be undefined if yyoverflow is a macro.  */
+        yyoverflow (YY_("memory exhausted"),
+                    &yyss1, yysize * sizeof (*yyssp),
+                    &yyvs1, yysize * sizeof (*yyvsp),]b4_locations_if([
+                    &yyls1, yysize * sizeof (*yylsp),])[
+                    &yystacksize);
 ]b4_locations_if([
-       yyls = yyls1;])[
-       yyss = yyss1;
-       yyvs = yyvs1;
+        yyls = yyls1;])[
+        yyss = yyss1;
+        yyvs = yyvs1;
       }
 #else /* no yyoverflow */
 # ifndef YYSTACK_RELOCATE
@@ -1647,23 +1583,23 @@ m4_ifdef([b4_at_dollar_used], [[  yylsp[0] = yylloc;
 # else
       /* Extend the stack our own way.  */
       if (YYMAXDEPTH <= yystacksize)
-       goto yyexhaustedlab;
+        goto yyexhaustedlab;
       yystacksize *= 2;
       if (YYMAXDEPTH < yystacksize)
-       yystacksize = YYMAXDEPTH;
+        yystacksize = YYMAXDEPTH;
 
       {
-       yytype_int16 *yyss1 = yyss;
-       union yyalloc *yyptr =
-         (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
-       if (! yyptr)
-         goto yyexhaustedlab;
-       YYSTACK_RELOCATE (yyss_alloc, yyss);
-       YYSTACK_RELOCATE (yyvs_alloc, yyvs);]b4_locations_if([
-       YYSTACK_RELOCATE (yyls_alloc, yyls);])[
+        yytype_int16 *yyss1 = yyss;
+        union yyalloc *yyptr =
+          (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
+        if (! yyptr)
+          goto yyexhaustedlab;
+        YYSTACK_RELOCATE (yyss_alloc, yyss);
+        YYSTACK_RELOCATE (yyvs_alloc, yyvs);]b4_locations_if([
+        YYSTACK_RELOCATE (yyls_alloc, yyls);])[
 #  undef YYSTACK_RELOCATE
-       if (yyss1 != yyssa)
-         YYSTACK_FREE (yyss1);
+        if (yyss1 != yyssa)
+          YYSTACK_FREE (yyss1);
       }
 # endif
 #endif /* no yyoverflow */
@@ -1673,10 +1609,10 @@ m4_ifdef([b4_at_dollar_used], [[  yylsp[0] = yylloc;
       yylsp = yyls + yysize - 1;])[
 
       YYDPRINTF ((stderr, "Stack size increased to %lu\n",
-                 (unsigned long int) yystacksize));
+                  (unsigned long int) yystacksize));
 
       if (yyss + yystacksize - 1 <= yyssp)
-       YYABORT;
+        YYABORT;
     }
 
   YYDPRINTF ((stderr, "Entering state %d\n", yystate));
@@ -1912,20 +1848,20 @@ yyerrlab:
   if (yyerrstatus == 3)
     {
       /* If just tried and failed to reuse lookahead token after an
-        error, discard it.  */
+         error, discard it.  */
 
       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
-       {
-         yydestruct ("Error: discarding",
-                     yytoken, &yylval]b4_locations_if([, &yylloc])[]b4_user_args[);
-         yychar = YYEMPTY;
-       }
+        {
+          yydestruct ("Error: discarding",
+                      yytoken, &yylval]b4_locations_if([, &yylloc])[]b4_user_args[);
+          yychar = YYEMPTY;
+        }
     }
 
   /* Else will try to reuse lookahead token after shifting the error
@@ -1958,29 +1894,29 @@ yyerrorlab:
 | 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.  */
 
   for (;;)
     {
       yyn = yypact[yystate];
       if (!yypact_value_is_default (yyn))
-       {
-         yyn += YYTERROR;
-         if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR)
-           {
-             yyn = yytable[yyn];
-             if (0 < yyn)
-               break;
-           }
-       }
+        {
+          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 (yyssp == yyss)
-       YYABORT;
+        YYABORT;
 
 ]b4_locations_if([[      yyerror_range[1] = *yylsp;]])[
       yydestruct ("Error: popping",
-                 yystos[yystate], yyvsp]b4_locations_if([, yylsp])[]b4_user_args[);
+                  yystos[yystate], yyvsp]b4_locations_if([, yylsp])[]b4_user_args[);
       YYPOPSTACK (1);
       yystate = *yyssp;
       YY_STACK_PRINT (yyss, yyssp);
@@ -2045,7 +1981,7 @@ yyreturn:
   while (yyssp != yyss)
     {
       yydestruct ("Cleanup: popping",
-                 yystos[*yyssp], yyvsp]b4_locations_if([, yylsp])[]b4_user_args[);
+                  yystos[*yyssp], yyvsp]b4_locations_if([, yylsp])[]b4_user_args[);
       YYPOPSTACK (1);
     }
 #ifndef yyoverflow
@@ -2065,12 +2001,10 @@ yypushreturn:]])[
   return YYID (yyresult);
 }
 
-
-]b4_epilogue
+]b4_epilogue[]dnl
 b4_defines_if(
 [@output(b4_spec_defines_file@)@
-b4_copyright([Bison interface for Yacc-like parsers in C],
-             [1984, 1989-1990, 2000-2011])
+b4_copyright([Bison interface for Yacc-like parsers in C])dnl
 
 b4_percent_code_get([[requires]])[]dnl
 
@@ -2133,3 +2067,4 @@ b4_c_function_decl([b4_prefix[pstate_delete]], [[void]],
 b4_percent_code_get([[provides]])[]dnl
 ])dnl b4_defines_if
 m4_divert_pop(0)
+m4_popdef([b4_copyright_years])