Merge remote-tracking branch 'origin/maint'

[bison.git] / data / yacc.c

                                                             -*- 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
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Check the value of %define api.push-pull.
b4_percent_define_default([[api.push-pull]], [[pull]])
b4_percent_define_check_values([[[[api.push-pull]],
                                 [[pull]], [[push]], [[both]]]])
b4_define_flag_if([pull]) m4_define([b4_pull_flag], [[1]])
b4_define_flag_if([push]) m4_define([b4_push_flag], [[1]])
m4_case(b4_percent_define_get([[api.push-pull]]),
        [pull], [m4_define([b4_push_flag], [[0]])],
        [push], [m4_define([b4_pull_flag], [[0]])])

# Handle BISON_USE_PUSH_FOR_PULL for the test suite.  So that push parsing
# tests function as written, do not let BISON_USE_PUSH_FOR_PULL modify the
# behavior of Bison at all when push parsing is already requested.
b4_define_flag_if([use_push_for_pull])
b4_use_push_for_pull_if([
  b4_push_if([m4_define([b4_use_push_for_pull_flag], [[0]])],
             [m4_define([b4_push_flag], [[1]])])])

# Check the value of %define parse.lac and friends, where LAC stands for
# lookahead correction.
b4_percent_define_default([[parse.lac]], [[none]])
b4_percent_define_default([[parse.lac.es-capacity-initial]], [[20]])
b4_percent_define_default([[parse.lac.memory-trace]], [[failures]])
b4_percent_define_check_values([[[[parse.lac]], [[full]], [[none]]]],
                               [[[[parse.lac.memory-trace]],
                                 [[failures]], [[full]]]])
b4_define_flag_if([lac])
m4_define([b4_lac_flag],
          [m4_if(b4_percent_define_get([[parse.lac]]),
                 [none], [[0]], [[1]])])

m4_include(b4_pkgdatadir/[c.m4])

## ---------------- ##
## Default values.  ##
## ---------------- ##

# Stack parameters.
m4_define_default([b4_stack_depth_max], [10000])
m4_define_default([b4_stack_depth_init],  [200])


## ------------------------ ##
## Pure/impure interfaces.  ##
## ------------------------ ##

b4_percent_define_default([[api.pure]], [[false]])
b4_define_flag_if([pure])
m4_define([b4_pure_flag],
          [b4_percent_define_flag_if([[api.pure]], [[1]], [[0]])])

# b4_yacc_pure_if(IF-TRUE, IF-FALSE)
# ----------------------------------
# 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])])


# b4_yyerror_args
# ---------------
# Arguments passed to yyerror: user args plus yylloc.
m4_define([b4_yyerror_args],
[b4_yacc_pure_if([b4_locations_if([&yylloc, ])])dnl
m4_ifset([b4_parse_param], [b4_c_args(b4_parse_param), ])])


# b4_lex_param
# ------------
# Accumulate in b4_lex_param all the yylex arguments.
# b4_lex_param arrives quoted twice, but we want to keep only one level.
m4_define([b4_lex_param],
m4_dquote(b4_pure_if([[[[YYSTYPE *]], [[&yylval]]][]dnl
b4_locations_if([, [[YYLTYPE *], [&yylloc]]])m4_ifdef([b4_lex_param], [, ])])dnl
m4_ifdef([b4_lex_param], b4_lex_param)))


## ------------ ##
## Data Types.  ##
## ------------ ##

# b4_int_type(MIN, MAX)
# ---------------------
# Return the smallest int type able to handle numbers ranging from
# MIN to MAX (included).  Overwrite the version from c.m4, which
# uses only C89 types, so that the user can override the shorter
# types, and so that pre-C89 compilers are handled correctly.
m4_define([b4_int_type],
[m4_if(b4_ints_in($@,      [0],   [255]), [1], [yytype_uint8],
       b4_ints_in($@,   [-128],   [127]), [1], [yytype_int8],

       b4_ints_in($@,      [0], [65535]), [1], [yytype_uint16],
       b4_ints_in($@, [-32768], [32767]), [1], [yytype_int16],

       m4_eval([0 <= $1]),                [1], [unsigned int],

                                               [int])])


## ----------------- ##
## Semantic Values.  ##
## ----------------- ##


# b4_lhs_value([TYPE])
# --------------------
# Expansion of $<TYPE>$.
m4_define([b4_lhs_value],
[b4_symbol_value(yyval, [$1])])


# 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([yyvsp@{b4_subtract([$2], [$1])@}], [$3])])



## ----------- ##
## Locations.  ##
## ----------- ##

# b4_lhs_location()
# -----------------
# Expansion of @$.
m4_define([b4_lhs_location],
[(yyloc)])


# b4_rhs_location(RULE-LENGTH, NUM)
# ---------------------------------
# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
# on RHS.
m4_define([b4_rhs_location],
          [(yylsp@{b4_subtract([$2], [$1])@})])


## -------------- ##
## Declarations.  ##
## -------------- ##

# b4_declare_scanner_communication_variables
# ------------------------------------------
# Declare the variables that are global, or local to YYPARSE if
# pure-parser.
m4_define([b4_declare_scanner_communication_variables], [[
/* The lookahead symbol.  */
int yychar;

/* The semantic value of the lookahead symbol.  */
YYSTYPE yylval;]b4_locations_if([[

/* Location data for the lookahead symbol.  */
YYLTYPE yylloc;]])b4_pure_if([], [[

/* Number of syntax errors so far.  */
int yynerrs;]])])


# b4_declare_parser_state_variables
# ---------------------------------
# Declare all the variables that are needed to maintain the parser state
# between calls to yypush_parse.
m4_define([b4_declare_parser_state_variables], [b4_pure_if([[
    /* Number of syntax errors so far.  */
    int yynerrs;
]])[
    int yystate;
    /* Number of tokens to shift before error messages enabled.  */
    int yyerrstatus;

    /* The stacks and their tools:
       `yyss': related to states.
       `yyvs': related to semantic values.]b4_locations_if([[
       `yyls': related to locations.]])[

       Refer to the stacks through separate pointers, to allow yyoverflow
       to reallocate them elsewhere.  */

    /* The state stack.  */
    yytype_int16 yyssa[YYINITDEPTH];
    yytype_int16 *yyss;
    yytype_int16 *yyssp;

    /* The semantic value stack.  */
    YYSTYPE yyvsa[YYINITDEPTH];
    YYSTYPE *yyvs;
    YYSTYPE *yyvsp;]b4_locations_if([[

    /* The location stack.  */
    YYLTYPE yylsa[YYINITDEPTH];
    YYLTYPE *yyls;
    YYLTYPE *yylsp;

    /* The locations where the error started and ended.  */
    YYLTYPE yyerror_range[3];]])[

    YYSIZE_T yystacksize;]b4_lac_if([[

    yytype_int16 yyesa@{]b4_percent_define_get([[parse.lac.es-capacity-initial]])[@};
    yytype_int16 *yyes;
    YYSIZE_T yyes_capacity;]])])


# b4_declare_yyparse_push_
# ------------------------
# Declaration of yyparse (and dependencies) when using the push parser
# (including in pull mode).
m4_define([b4_declare_yyparse_push_],
[[typedef struct ]b4_prefix[pstate ]b4_prefix[pstate;
enum { YYPUSH_MORE = 4 };
]b4_pull_if([b4_c_function_decl([b4_prefix[parse]], [[int]], b4_parse_param)
])b4_c_function_decl([b4_prefix[push_parse]], [[int]],
  [[b4_prefix[pstate *yyps]], [[yyps]]]b4_pure_if([,
  [[[int yypushed_char]], [[yypushed_char]]],
  [[[YYSTYPE const *yypushed_val]], [[yypushed_val]]]b4_locations_if([,
  [[[YYLTYPE const *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
  b4_parse_param]))
b4_pull_if([b4_c_function_decl([b4_prefix[pull_parse]], [[int]],
  [[b4_prefix[pstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
  b4_parse_param]))])
b4_c_function_decl([b4_prefix[pstate_new]], [b4_prefix[pstate *]],
                    [[[void]], []])
b4_c_function_decl([b4_prefix[pstate_delete]], [[void]],
                   [[b4_prefix[pstate *yyps]], [[yyps]]])dnl
])

# b4_declare_yyparse_
# -------------------
# When not the push parser.
m4_define([b4_declare_yyparse_],
[[#ifdef YYPARSE_PARAM
]b4_c_function_decl(b4_prefix[parse], [int],
                    [[void *YYPARSE_PARAM], [YYPARSE_PARAM]])[
#else /* ! YYPARSE_PARAM */
]b4_c_function_decl(b4_prefix[parse], [int], b4_parse_param)[
#endif /* ! YYPARSE_PARAM */]dnl
])


# b4_declare_yyparse
# ------------------
m4_define([b4_declare_yyparse],
[b4_push_if([b4_declare_yyparse_push_],
            [b4_declare_yyparse_])[]dnl
])


# b4_shared_declarations
# ----------------------
# Declaration that might either go into the header (if --defines)
# or open coded in the parser body.
m4_define([b4_shared_declarations],
[b4_cpp_guard_open([b4_spec_defines_file])[
]b4_declare_yydebug[
]b4_percent_code_get([[requires]])[
]b4_token_enums_defines(b4_tokens)[
]b4_declare_yylstype[
]b4_declare_yyparse[
]b4_percent_code_get([[provides]])[
]b4_cpp_guard_close([b4_spec_defines_file])[]dnl
])

## -------------- ##
## Output files.  ##
## -------------- ##

# We do want M4 expansion after # for CPP macros.
m4_changecom()
m4_divert_push(0)dnl
@output(b4_parser_file_name@)@
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.  */

/* All symbols defined below should begin with yy or YY, to avoid
   infringing on user name space.  This should be done even for local
   variables, as they might otherwise be expanded by user macros.
   There are some unavoidable exceptions within include files to
   define necessary library symbols; they are noted "INFRINGES ON
   USER NAME SPACE" below.  */

]b4_identification
b4_percent_code_get([[top]])[]dnl
m4_if(b4_api_prefix, [yy], [],
[[/* Substitute the type names.  */
#define YYSTYPE              ]b4_api_PREFIX[STYPE
#define YYSTYPE_IS_TRIVIAL   ]b4_api_PREFIX[STYPE_IS_TRIVIAL
#define YYSTYPE_IS_DECLARED  ]b4_api_PREFIX[STYPE_IS_DECLARED]b4_locations_if([[
#define YYLTYPE              ]b4_api_PREFIX[LTYPE
#define YYLTYPE_IS_TRIVIAL   ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
#define YYLTYPE_IS_DECLARED  ]b4_api_PREFIX[LTYPE_IS_DECLARED]])])[
]m4_if(b4_prefix, [yy], [],
[[/* Substitute the variable and function names.  */]b4_pull_if([[
#define yyparse         ]b4_prefix[parse]])b4_push_if([[
#define yypush_parse    ]b4_prefix[push_parse]b4_pull_if([[
#define yypull_parse    ]b4_prefix[pull_parse]])[
#define yypstate_new    ]b4_prefix[pstate_new
#define yypstate_delete ]b4_prefix[pstate_delete
#define yypstate        ]b4_prefix[pstate]])[
#define yylex           ]b4_prefix[lex
#define yyerror         ]b4_prefix[error
#define yylval          ]b4_prefix[lval
#define yychar          ]b4_prefix[char
#define yydebug         ]b4_prefix[debug
#define yynerrs         ]b4_prefix[nerrs]b4_locations_if([[
#define yylloc          ]b4_prefix[lloc]])])[

/* Copy the first part of user declarations.  */
]b4_user_pre_prologue[

]b4_null_define[

/* Enabling verbose error messages.  */
#ifdef YYERROR_VERBOSE
# undef YYERROR_VERBOSE
# define YYERROR_VERBOSE 1
#else
# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[
#endif

/* In a future release of Bison, this section will be replaced
   by #include "@basename(]b4_spec_defines_file[@)".  */
]b4_shared_declarations[

/* Copy the second part of user declarations.  */
]b4_user_post_prologue
b4_percent_code_get[]dnl

[#ifdef short
# undef short
#endif

#ifdef YYTYPE_UINT8
typedef YYTYPE_UINT8 yytype_uint8;
#else
typedef unsigned char yytype_uint8;
#endif

#ifdef YYTYPE_INT8
typedef YYTYPE_INT8 yytype_int8;
#elif ]b4_c_modern[
typedef signed char yytype_int8;
#else
typedef short int yytype_int8;
#endif

#ifdef YYTYPE_UINT16
typedef YYTYPE_UINT16 yytype_uint16;
#else
typedef unsigned short int yytype_uint16;
#endif

#ifdef YYTYPE_INT16
typedef YYTYPE_INT16 yytype_int16;
#else
typedef short int yytype_int16;
#endif

#ifndef YYSIZE_T
# ifdef __SIZE_TYPE__
#  define YYSIZE_T __SIZE_TYPE__
# elif defined size_t
#  define YYSIZE_T size_t
# elif ! defined YYSIZE_T && ]b4_c_modern[
#  include <stddef.h> /* INFRINGES ON USER NAME SPACE */
#  define YYSIZE_T size_t
# else
#  define YYSIZE_T unsigned int
# endif
#endif

#define YYSIZE_MAXIMUM ((YYSIZE_T) -1)

#ifndef YY_
# if defined YYENABLE_NLS && YYENABLE_NLS
#  if ENABLE_NLS
#   include <libintl.h> /* INFRINGES ON USER NAME SPACE */
#   define YY_(msgid) dgettext ("bison-runtime", msgid)
#  endif
# endif
# ifndef YY_
#  define YY_(msgid) msgid
# endif
#endif

/* Suppress unused-variable warnings by "using" E.  */
#if ! defined lint || defined __GNUC__
# define YYUSE(e) ((void) (e))
#else
# define YYUSE(e) /* empty */
#endif

/* Identity function, used to suppress warnings about constant conditions.  */
#ifndef lint
# define YYID(n) (n)
#else
]b4_c_function_def([YYID], [static int], [[int yyi], [yyi]])[
{
  return yyi;
}
#endif

#if ]b4_lac_if([[1]], [[! defined yyoverflow || YYERROR_VERBOSE]])[

/* The parser invokes alloca or malloc; define the necessary symbols.  */]dnl
b4_push_if([], [b4_lac_if([], [[

# ifdef YYSTACK_USE_ALLOCA
#  if YYSTACK_USE_ALLOCA
#   ifdef __GNUC__
#    define YYSTACK_ALLOC __builtin_alloca
#   elif defined __BUILTIN_VA_ARG_INCR
#    include <alloca.h> /* INFRINGES ON USER NAME SPACE */
#   elif defined _AIX
#    define YYSTACK_ALLOC __alloca
#   elif defined _MSC_VER
#    include <malloc.h> /* INFRINGES ON USER NAME SPACE */
#    define alloca _alloca
#   else
#    define YYSTACK_ALLOC alloca
#    if ! defined _ALLOCA_H && ! defined EXIT_SUCCESS && ]b4_c_modern[
#     include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
      /* Use EXIT_SUCCESS as a witness for stdlib.h.  */
#     ifndef EXIT_SUCCESS
#      define EXIT_SUCCESS 0
#     endif
#    endif
#   endif
#  endif
# endif]])])[

# ifdef YYSTACK_ALLOC
   /* Pacify GCC's `empty if-body' warning.  */
#  define YYSTACK_FREE(Ptr) do { /* empty */; } while (YYID (0))
#  ifndef YYSTACK_ALLOC_MAXIMUM
    /* The OS might guarantee only one guard page at the bottom of the stack,
       and a page size can be as small as 4096 bytes.  So we cannot safely
       invoke alloca (N) if N exceeds 4096.  Use a slightly smaller number
       to allow for a few compiler-allocated temporary stack slots.  */
#   define YYSTACK_ALLOC_MAXIMUM 4032 /* reasonable circa 2006 */
#  endif
# else
#  define YYSTACK_ALLOC YYMALLOC
#  define YYSTACK_FREE YYFREE
#  ifndef YYSTACK_ALLOC_MAXIMUM
#   define YYSTACK_ALLOC_MAXIMUM YYSIZE_MAXIMUM
#  endif
#  if (defined __cplusplus && ! defined EXIT_SUCCESS \
       && ! ((defined YYMALLOC || defined malloc) \
             && (defined YYFREE || defined free)))
#   include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
#   ifndef EXIT_SUCCESS
#    define EXIT_SUCCESS 0
#   endif
#  endif
#  ifndef YYMALLOC
#   define YYMALLOC malloc
#   if ! defined malloc && ! defined EXIT_SUCCESS && ]b4_c_modern[
void *malloc (YYSIZE_T); /* INFRINGES ON USER NAME SPACE */
#   endif
#  endif
#  ifndef YYFREE
#   define YYFREE free
#   if ! defined free && ! defined EXIT_SUCCESS && ]b4_c_modern[
void free (void *); /* INFRINGES ON USER NAME SPACE */
#   endif
#  endif
# endif]b4_lac_if([[
# define YYCOPY_NEEDED 1]])[
#endif]b4_lac_if([], [[ /* ! defined yyoverflow || YYERROR_VERBOSE */]])[


#if (! defined yyoverflow \
     && (! defined __cplusplus \
         || (]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
{
  yytype_int16 yyss_alloc;
  YYSTYPE yyvs_alloc;]b4_locations_if([
  YYLTYPE yyls_alloc;])[
};

/* The size of the maximum gap between one aligned stack and the next.  */
# define YYSTACK_GAP_MAXIMUM (sizeof (union yyalloc) - 1)

/* The size of an array large to enough to hold all stacks, each with
   N elements.  */
]b4_locations_if(
[# define YYSTACK_BYTES(N) \
     ((N) * (sizeof (yytype_int16) + sizeof (YYSTYPE) + sizeof (YYLTYPE)) \
      + 2 * YYSTACK_GAP_MAXIMUM)],
[# define YYSTACK_BYTES(N) \
     ((N) * (sizeof (yytype_int16) + sizeof (YYSTYPE)) \
      + YYSTACK_GAP_MAXIMUM)])[

# define YYCOPY_NEEDED 1

/* Relocate STACK from its old location to the new one.  The
   local variables YYSIZE and YYSTACKSIZE give the old and new number of
   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);                          \
      }                                                                 \
    while (YYID (0))

#endif

#if defined YYCOPY_NEEDED && YYCOPY_NEEDED
/* Copy COUNT objects from SRC to DST.  The source and destination do
   not overlap.  */
# ifndef YYCOPY
#  if defined __GNUC__ && 1 < __GNUC__
#   define YYCOPY(Dst, Src, Count) \
      __builtin_memcpy (Dst, Src, (Count) * sizeof (*(Src)))
#  else
#   define YYCOPY(Dst, Src, Count)              \
      do                                        \
        {                                       \
          YYSIZE_T yyi;                         \
          for (yyi = 0; yyi < (Count); yyi++)   \
            (Dst)[yyi] = (Src)[yyi];            \
        }                                       \
      while (YYID (0))
#  endif
# endif
#endif /* !YYCOPY_NEEDED */

/* YYFINAL -- State number of the termination state.  */
#define YYFINAL  ]b4_final_state_number[
/* YYLAST -- Last index in YYTABLE.  */
#define YYLAST   ]b4_last[

/* YYNTOKENS -- Number of terminals.  */
#define YYNTOKENS  ]b4_tokens_number[
/* YYNNTS -- Number of nonterminals.  */
#define YYNNTS  ]b4_nterms_number[
/* YYNRULES -- Number of rules.  */
#define YYNRULES  ]b4_rules_number[
/* YYNSTATES -- Number of states.  */
#define YYNSTATES  ]b4_states_number[

/* 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)                                                \
  ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)

/* 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
]b4_integral_parser_table_define([rline], [b4_rline],
     [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[
#endif

#if YYDEBUG || YYERROR_VERBOSE || ]b4_token_table_flag[
/* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
   First, the terminals, then, starting at YYNTOKENS, nonterminals.  */
static const char *const yytname[] =
{
  ]b4_tname[
};
#endif

# ifdef YYPRINT
/* 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

#define YYPACT_NINF ]b4_pact_ninf[

#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])[

]b4_parser_tables_define[

#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


/* Like YYERROR except do call yyerror.  This remains here temporarily
   to ease the transition to the new meaning of YYERROR, for GCC.
   Once GCC version 2 has supplanted version 1, this can go.  However,
   YYFAIL appears to be in use.  Nevertheless, it is formally deprecated
   in Bison 2.4.2's NEWS entry, where a plan to phase it out is
   discussed.  */

#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
     some users do, and we want to make it easy for users to remove
     YYFAIL uses, which will produce warnings from Bison 2.5.  */
#endif

#define YYRECOVERING()  (!!yyerrstatus)

#define YYBACKUP(Token, Value)                                  \
do                                                              \
  if (yychar == YYEMPTY)                                        \
    {                                                           \
      yychar = (Token);                                         \
      yylval = (Value);                                         \
      YYPOPSTACK (yylen);                                       \
      yystate = *yyssp;                                         \]b4_lac_if([[
      YY_LAC_DISCARD ("YYBACKUP");                              \]])[
      goto yybackup;                                            \
    }                                                           \
  else                                                          \
    {                                                           \
      yyerror (]b4_yyerror_args[YY_("syntax error: cannot back up")); \
      YYERROR;                                                  \
    }                                                           \
while (YYID (0))


#define YYTERROR        1
#define YYERRCODE       256


/* 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])
#ifndef YYLLOC_DEFAULT
# 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;                              \
        }                                                               \
    while (YYID (0))
#endif]b4_locations_if([[


/* YY_LOCATION_PRINT -- Print the location on the stream.
   This macro was not mandated originally: define only if we know
   we won't break user code: when these are the locations we know.  */

#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)
# else
#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
# endif
#endif]], [[


/* This macro is provided for backward compatibility. */

#ifndef YY_LOCATION_PRINT
# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
#endif]])[


/* YYLEX -- calling `yylex' with the right arguments.  */

#ifdef YYLEX_PARAM
# define YYLEX yylex (]b4_pure_if([&yylval[]b4_locations_if([, &yylloc]), ])[YYLEX_PARAM)
#else
# define YYLEX ]b4_c_function_call([yylex], [int], b4_lex_param)[
#endif

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

# ifndef YYFPRINTF
#  include <stdio.h> /* INFRINGES ON USER NAME SPACE */
#  define YYFPRINTF fprintf
# endif

# 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");                                           \
    }                                                                     \
} while (YYID (0))

]b4_yy_symbol_print_generate([b4_c_function_def])[

/*------------------------------------------------------------------.
| yy_stack_print -- Print the state stack from its BOTTOM up to its |
| TOP (included).                                                   |
`------------------------------------------------------------------*/

]b4_c_function_def([yy_stack_print], [static void],
                   [[yytype_int16 *yybottom], [yybottom]],
                   [[yytype_int16 *yytop],    [yytop]])[
{
  YYFPRINTF (stderr, "Stack now");
  for (; yybottom <= yytop; yybottom++)
    {
      int yybot = *yybottom;
      YYFPRINTF (stderr, " %d", yybot);
    }
  YYFPRINTF (stderr, "\n");
}

# define YY_STACK_PRINT(Bottom, Top)                            \
do {                                                            \
  if (yydebug)                                                  \
    yy_stack_print ((Bottom), (Top));                           \
} while (YYID (0))


/*------------------------------------------------.
| Report that the YYRULE is going to be reduced.  |
`------------------------------------------------*/

]b4_c_function_def([yy_reduce_print], [static void],
                   [[yytype_int16 *yyssp], [yyssp]],
                   [[YYSTYPE *yyvsp], [yyvsp]],
    b4_locations_if([[[YYLTYPE *yylsp], [yylsp]],
                   ])[[int yyrule], [yyrule]]m4_ifset([b4_parse_param], [,
                   b4_parse_param]))[
{
  unsigned long int yylno = yyrline[yyrule];
  int yynrhs = yyr2[yyrule];
  int yyi;
  YYFPRINTF (stderr, "Reducing stack by rule %d (line %lu):\n",
             yyrule - 1, yylno);
  /* The symbols being reduced.  */
  for (yyi = 0; yyi < yynrhs; yyi++)
    {
      YYFPRINTF (stderr, "   $%d = ", yyi + 1);
      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 (yyssp, yyvsp, ]b4_locations_if([yylsp, ])[Rule]b4_user_args[); \
} while (YYID (0))

/* Nonzero means print parse trace.  It is left uninitialized so that
   multiple parsers can coexist.  */
int yydebug;
#else /* !YYDEBUG */
# define YYDPRINTF(Args)
# define YY_SYMBOL_PRINT(Title, Type, Value, Location)
# define YY_STACK_PRINT(Bottom, Top)
# define YY_REDUCE_PRINT(Rule)
#endif /* !YYDEBUG */


/* YYINITDEPTH -- initial size of the parser's stacks.  */
#ifndef YYINITDEPTH
# define YYINITDEPTH ]b4_stack_depth_init[
#endif

/* YYMAXDEPTH -- maximum size the stacks can grow to (effective only
   if the built-in stack extension method is used).

   Do not make this value too large; the results are undefined if
   YYSTACK_ALLOC_MAXIMUM < YYSTACK_BYTES (YYMAXDEPTH)
   evaluated with infinite-precision integer arithmetic.  */

#ifndef YYMAXDEPTH
# define YYMAXDEPTH ]b4_stack_depth_max[
#endif]b4_lac_if([[

/* Given a state stack such that *YYBOTTOM is its bottom, such that
   *YYTOP is either its top or is YYTOP_EMPTY to indicate an empty
   stack, and such that *YYCAPACITY is the maximum number of elements it
   can hold without a reallocation, make sure there is enough room to
   store YYADD more elements.  If not, allocate a new stack using
   YYSTACK_ALLOC, copy the existing elements, and adjust *YYBOTTOM,
   *YYTOP, and *YYCAPACITY to reflect the new capacity and memory
   location.  If *YYBOTTOM != YYBOTTOM_NO_FREE, then free the old stack
   using YYSTACK_FREE.  Return 0 if successful or if no reallocation is
   required.  Return 1 if memory is exhausted.  */
static int
yy_lac_stack_realloc (YYSIZE_T *yycapacity, YYSIZE_T yyadd,
#if YYDEBUG
                      char const *yydebug_prefix,
                      char const *yydebug_suffix,
#endif
                      yytype_int16 **yybottom,
                      yytype_int16 *yybottom_no_free,
                      yytype_int16 **yytop, yytype_int16 *yytop_empty)
{
  YYSIZE_T yysize_old =
    *yytop == yytop_empty ? 0 : *yytop - *yybottom + 1;
  YYSIZE_T yysize_new = yysize_old + yyadd;
  if (*yycapacity < yysize_new)
    {
      YYSIZE_T yyalloc = 2 * yysize_new;
      yytype_int16 *yybottom_new;
      /* Use YYMAXDEPTH for maximum stack size given that the stack
         should never need to grow larger than the main state stack
         needs to grow without LAC.  */
      if (YYMAXDEPTH < yysize_new)
        {
          YYDPRINTF ((stderr, "%smax size exceeded%s", yydebug_prefix,
                      yydebug_suffix));
          return 1;
        }
      if (YYMAXDEPTH < yyalloc)
        yyalloc = YYMAXDEPTH;
      yybottom_new =
        (yytype_int16*) YYSTACK_ALLOC (yyalloc * sizeof *yybottom_new);
      if (!yybottom_new)
        {
          YYDPRINTF ((stderr, "%srealloc failed%s", yydebug_prefix,
                      yydebug_suffix));
          return 1;
        }
      if (*yytop != yytop_empty)
        {
          YYCOPY (yybottom_new, *yybottom, yysize_old);
          *yytop = yybottom_new + (yysize_old - 1);
        }
      if (*yybottom != yybottom_no_free)
        YYSTACK_FREE (*yybottom);
      *yybottom = yybottom_new;
      *yycapacity = yyalloc;]m4_if(b4_percent_define_get([[parse.lac.memory-trace]]),
                                   [full], [[
      YYDPRINTF ((stderr, "%srealloc to %lu%s", yydebug_prefix,
                  (unsigned long int) yyalloc, yydebug_suffix));]])[
    }
  return 0;
}

/* Establish the initial context for the current lookahead if no initial
   context is currently established.

   We define a context as a snapshot of the parser stacks.  We define
   the initial context for a lookahead as the context in which the
   parser initially examines that lookahead in order to select a
   syntactic action.  Thus, if the lookahead eventually proves
   syntactically unacceptable (possibly in a later context reached via a
   series of reductions), the initial context can be used to determine
   the exact set of tokens that would be syntactically acceptable in the
   lookahead's place.  Moreover, it is the context after which any
   further semantic actions would be erroneous because they would be
   determined by a syntactically unacceptable token.

   YY_LAC_ESTABLISH should be invoked when a reduction is about to be
   performed in an inconsistent state (which, for the purposes of LAC,
   includes consistent states that don't know they're consistent because
   their default reductions have been disabled).  Iff there is a
   lookahead token, it should also be invoked before reporting a syntax
   error.  This latter case is for the sake of the debugging output.

   For parse.lac=full, the implementation of YY_LAC_ESTABLISH is as
   follows.  If no initial context is currently established for the
   current lookahead, then check if that lookahead can eventually be
   shifted if syntactic actions continue from the current context.
   Report a syntax error if it cannot.  */
#define YY_LAC_ESTABLISH                                         \
do {                                                             \
  if (!yy_lac_established)                                       \
    {                                                            \
      YYDPRINTF ((stderr,                                        \
                  "LAC: initial context established for %s\n",   \
                  yytname[yytoken]));                            \
      yy_lac_established = 1;                                    \
      {                                                          \
        int yy_lac_status =                                      \
          yy_lac (yyesa, &yyes, &yyes_capacity, yyssp, yytoken); \
        if (yy_lac_status == 2)                                  \
          goto yyexhaustedlab;                                   \
        if (yy_lac_status == 1)                                  \
          goto yyerrlab;                                         \
      }                                                          \
    }                                                            \
} while (YYID (0))

/* Discard any previous initial lookahead context because of Event,
   which may be a lookahead change or an invalidation of the currently
   established initial context for the current lookahead.

   The most common example of a lookahead change is a shift.  An example
   of both cases is syntax error recovery.  That is, a syntax error
   occurs when the lookahead is syntactically erroneous for the
   currently established initial context, so error recovery manipulates
   the parser stacks to try to find a new initial context in which the
   current lookahead is syntactically acceptable.  If it fails to find
   such a context, it discards the lookahead.  */
#if YYDEBUG
# define YY_LAC_DISCARD(Event)                                           \
do {                                                                     \
  if (yy_lac_established)                                                \
    {                                                                    \
      if (yydebug)                                                       \
        YYFPRINTF (stderr, "LAC: initial context discarded due to "      \
                   Event "\n");                                          \
      yy_lac_established = 0;                                            \
    }                                                                    \
} while (YYID (0))
#else
# define YY_LAC_DISCARD(Event) yy_lac_established = 0
#endif

/* Given the stack whose top is *YYSSP, return 0 iff YYTOKEN can
   eventually (after perhaps some reductions) be shifted, return 1 if
   not, or return 2 if memory is exhausted.  As preconditions and
   postconditions: *YYES_CAPACITY is the allocated size of the array to
   which *YYES points, and either *YYES = YYESA or *YYES points to an
   array allocated with YYSTACK_ALLOC.  yy_lac may overwrite the
   contents of either array, alter *YYES and *YYES_CAPACITY, and free
   any old *YYES other than YYESA.  */
static int
yy_lac (yytype_int16 *yyesa, yytype_int16 **yyes,
        YYSIZE_T *yyes_capacity, yytype_int16 *yyssp, int yytoken)
{
  yytype_int16 *yyes_prev = yyssp;
  yytype_int16 *yyesp = yyes_prev;
  YYDPRINTF ((stderr, "LAC: checking lookahead %s:", yytname[yytoken]));
  if (yytoken == YYUNDEFTOK)
    {
      YYDPRINTF ((stderr, " Always Err\n"));
      return 1;
    }
  while (1)
    {
      int yyrule = yypact[*yyesp];
      if (yypact_value_is_default (yyrule)
          || (yyrule += yytoken) < 0 || YYLAST < yyrule
          || yycheck[yyrule] != yytoken)
        {
          yyrule = yydefact[*yyesp];
          if (yyrule == 0)
            {
              YYDPRINTF ((stderr, " Err\n"));
              return 1;
            }
        }
      else
        {
          yyrule = yytable[yyrule];
          if (yytable_value_is_error (yyrule))
            {
              YYDPRINTF ((stderr, " Err\n"));
              return 1;
            }
          if (0 < yyrule)
            {
              YYDPRINTF ((stderr, " S%d\n", yyrule));
              return 0;
            }
          yyrule = -yyrule;
        }
      {
        YYSIZE_T yylen = yyr2[yyrule];
        YYDPRINTF ((stderr, " R%d", yyrule - 1));
        if (yyesp != yyes_prev)
          {
            YYSIZE_T yysize = yyesp - *yyes + 1;
            if (yylen < yysize)
              {
                yyesp -= yylen;
                yylen = 0;
              }
            else
              {
                yylen -= yysize;
                yyesp = yyes_prev;
              }
          }
        if (yylen)
          yyesp = yyes_prev -= yylen;
      }
      {
        int yystate;
        {
          int yylhs = yyr1[yyrule] - YYNTOKENS;
          yystate = yypgoto[yylhs] + *yyesp;
          if (yystate < 0 || YYLAST < yystate
              || yycheck[yystate] != *yyesp)
            yystate = yydefgoto[yylhs];
          else
            yystate = yytable[yystate];
        }
        if (yyesp == yyes_prev)
          {
            yyesp = *yyes;
            *yyesp = yystate;
          }
        else
          {
            if (yy_lac_stack_realloc (yyes_capacity, 1,
#if YYDEBUG
                                      " (", ")",
#endif
                                      yyes, yyesa, &yyesp, yyes_prev))
              {
                YYDPRINTF ((stderr, "\n"));
                return 2;
              }
            *++yyesp = yystate;
          }
        YYDPRINTF ((stderr, " G%d", yystate));
      }
    }
}]])[


#if YYERROR_VERBOSE

# ifndef yystrlen
#  if defined __GLIBC__ && defined _STRING_H
#   define yystrlen strlen
#  else
/* Return the length of YYSTR.  */
]b4_c_function_def([yystrlen], [static YYSIZE_T],
   [[const char *yystr], [yystr]])[
{
  YYSIZE_T yylen;
  for (yylen = 0; yystr[yylen]; yylen++)
    continue;
  return yylen;
}
#  endif
# endif

# ifndef yystpcpy
#  if defined __GLIBC__ && defined _STRING_H && defined _GNU_SOURCE
#   define yystpcpy stpcpy
#  else
/* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in
   YYDEST.  */
]b4_c_function_def([yystpcpy], [static char *],
   [[char *yydest], [yydest]], [[const char *yysrc], [yysrc]])[
{
  char *yyd = yydest;
  const char *yys = yysrc;

  while ((*yyd++ = *yys++) != '\0')
    continue;

  return yyd - 1;
}
#  endif
# endif

# ifndef yytnamerr
/* Copy to YYRES the contents of YYSTR after stripping away unnecessary
   quotes and backslashes, so that it's suitable for yyerror.  The
   heuristic is that double-quoting is unnecessary unless the string
   contains an apostrophe, a comma, or backslash (other than
   backslash-backslash).  YYSTR is taken from yytname.  If YYRES is
   null, do not copy; instead, return the length of what the result
   would have been.  */
static YYSIZE_T
yytnamerr (char *yyres, const char *yystr)
{
  if (*yystr == '"')
    {
      YYSIZE_T yyn = 0;
      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;
          }
    do_not_strip_quotes: ;
    }

  if (! yyres)
    return yystrlen (yystr);

  return yystpcpy (yyres, yystr) - yyres;
}
# endif

/* Copy into *YYMSG, which is of size *YYMSG_ALLOC, an error message
   about the unexpected token YYTOKEN for the state stack whose top is
   YYSSP.]b4_lac_if([[  In order to see if a particular token T is a
   valid looakhead, invoke yy_lac (YYESA, YYES, YYES_CAPACITY, YYSSP, T).]])[

   Return 0 if *YYMSG was successfully written.  Return 1 if *YYMSG is
   not large enough to hold the message.  In that case, also set
   *YYMSG_ALLOC to the required number of bytes.  Return 2 if the
   required number of bytes is too large to store]b4_lac_if([[ or if
   yy_lac returned 2]])[.  */
static int
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 (YY_NULL, yytname[yytoken]);
  YYSIZE_T yysize = yysize0;
  YYSIZE_T yysize1;
  enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
  /* Internationalized format string. */
  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
     "expected"). */
  int yycount = 0;

  /* There are many possibilities here to consider:
     - Assume YYFAIL is not used.  It's too flawed to consider.  See
       <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
       for details.  YYERROR is fine as it does not invoke this
       function.
     - 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 yychar) 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 yychar.]b4_lac_if([[
       In the first two cases, it might appear that the current syntax
       error should have been detected in the previous state when yy_lac
       was invoked.  However, at that time, there might have been a
       different syntax error that discarded a different initial context
       during error recovery, leaving behind the current lookahead.]], [[
     - 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)
    {
      int yyn = yypact[*yyssp];]b4_lac_if([[
      YYDPRINTF ((stderr, "Constructing syntax error message\n"));]])[
      yyarg[yycount++] = yytname[yytoken];
      if (!yypact_value_is_default (yyn))
        {]b4_lac_if([], [[
          /* 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;]])[
          int yyx;]b4_lac_if([[

          for (yyx = 0; yyx < YYNTOKENS; ++yyx)
            if (yyx != YYTERROR && yyx != YYUNDEFTOK)
              {
                {
                  int yy_lac_status = yy_lac (yyesa, yyes, yyes_capacity,
                                              yyssp, yyx);
                  if (yy_lac_status == 2)
                    return 2;
                  if (yy_lac_status == 1)
                    continue;
                }]], [[

          for (yyx = yyxbegin; yyx < yyxend; ++yyx)
            if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR
                && !yytable_value_is_error (yytable[yyx + yyn]))
              {]])[
                if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
                  {
                    yycount = 1;
                    yysize = yysize0;
                    break;
                  }
                yyarg[yycount++] = yytname[yyx];
                yysize1 = yysize + yytnamerr (YY_NULL, yytname[yyx]);
                if (! (yysize <= yysize1
                       && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
                  return 2;
                yysize = yysize1;
              }
        }]b4_lac_if([[
# if YYDEBUG
      else if (yydebug)
        YYFPRINTF (stderr, "No expected tokens.\n");
# endif]])[
    }

  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_
    }

  yysize1 = yysize + yystrlen (yyformat);
  if (! (yysize <= yysize1 && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
    return 2;
  yysize = yysize1;

  if (*yymsg_alloc < yysize)
    {
      *yymsg_alloc = 2 * yysize;
      if (! (yysize <= *yymsg_alloc
             && *yymsg_alloc <= YYSTACK_ALLOC_MAXIMUM))
        *yymsg_alloc = YYSTACK_ALLOC_MAXIMUM;
      return 1;
    }

  /* Avoid sprintf, as that infringes on the user's name space.
     Don't have undefined behavior even if the translation
     produced a string with the wrong number of "%s"s.  */
  {
    char *yyp = *yymsg;
    int yyi = 0;
    while ((*yyp = *yyformat) != '\0')
      if (*yyp == '%' && yyformat[1] == 's' && yyi < yycount)
        {
          yyp += yytnamerr (yyp, yyarg[yyi++]);
          yyformat += 2;
        }
      else
        {
          yyp++;
          yyformat++;
        }
  }
  return 0;
}
#endif /* YYERROR_VERBOSE */

]b4_yydestruct_generate([b4_c_function_def])[

]b4_pure_if([], [

b4_declare_scanner_communication_variables])[]b4_push_if([[

struct yypstate
  {]b4_declare_parser_state_variables[
    /* Used to determine if this is the first time this instance has
       been used.  */
    int yynew;
  };]b4_pure_if([], [[

static char yypstate_allocated = 0;]])b4_pull_if([

b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
{
  return yypull_parse (YY_NULL]m4_ifset([b4_parse_param],
                                  [[, ]b4_c_args(b4_parse_param)])[);
}

]b4_c_function_def([[yypull_parse]], [[int]],
  [[[yypstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
  b4_parse_param]))[
{
  int yystatus;
  yypstate *yyps_local;]b4_pure_if([[
  int yychar;
  YYSTYPE yylval;]b4_locations_if([[
  YYLTYPE yylloc;]])])[
  if (yyps)
    yyps_local = yyps;
  else
    {
      yyps_local = yypstate_new ();
      if (!yyps_local)
        {]b4_pure_if([[
          yyerror (]b4_yyerror_args[YY_("memory exhausted"));]], [[
          if (!yypstate_allocated)
            yyerror (]b4_yyerror_args[YY_("memory exhausted"));]])[
          return 2;
        }
    }
  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)
    yypstate_delete (yyps_local);
  return yystatus;
}]])[

/* Initialize the parser data structure.  */
]b4_c_function_def([[yypstate_new]], [[yypstate *]])[
{
  yypstate *yyps;]b4_pure_if([], [[
  if (yypstate_allocated)
    return YY_NULL;]])[
  yyps = (yypstate *) malloc (sizeof *yyps);
  if (!yyps)
    return YY_NULL;
  yyps->yynew = 1;]b4_pure_if([], [[
  yypstate_allocated = 1;]])[
  return yyps;
}

]b4_c_function_def([[yypstate_delete]], [[void]],
                   [[[yypstate *yyps]], [[yyps]]])[
{
#ifndef yyoverflow
  /* If the stack was reallocated but the parse did not complete, then the
     stack still needs to be freed.  */
  if (!yyps->yynew && yyps->yyss != yyps->yyssa)
    YYSTACK_FREE (yyps->yyss);
#endif]b4_lac_if([[
  if (!yyps->yynew && yyps->yyes != yyps->yyesa)
    YYSTACK_FREE (yyps->yyes);]])[
  free (yyps);]b4_pure_if([], [[
  yypstate_allocated = 0;]])[
}
]b4_pure_if([[
#define ]b4_prefix[nerrs yyps->]b4_prefix[nerrs]])[
#define yystate yyps->yystate
#define yyerrstatus yyps->yyerrstatus
#define yyssa yyps->yyssa
#define yyss yyps->yyss
#define yyssp yyps->yyssp
#define yyvsa yyps->yyvsa
#define yyvs yyps->yyvs
#define yyvsp yyps->yyvsp]b4_locations_if([[
#define yylsa yyps->yylsa
#define yyls yyps->yyls
#define yylsp yyps->yylsp
#define yyerror_range yyps->yyerror_range]])[
#define yystacksize yyps->yystacksize]b4_lac_if([[
#define yyesa yyps->yyesa
#define yyes yyps->yyes
#define yyes_capacity yyps->yyes_capacity]])[


/*---------------.
| yypush_parse.  |
`---------------*/

]b4_c_function_def([[yypush_parse]], [[int]],
  [[[yypstate *yyps]], [[yyps]]]b4_pure_if([,
  [[[int yypushed_char]], [[yypushed_char]]],
  [[[YYSTYPE const *yypushed_val]], [[yypushed_val]]]b4_locations_if([,
  [[[YYLTYPE const *yypushed_loc]], [[yypushed_loc]]]])])m4_ifset([b4_parse_param], [,
  b4_parse_param]))], [[


/*----------.
| yyparse.  |
`----------*/

#ifdef YYPARSE_PARAM
]b4_c_function_def([yyparse], [int],
                   [[void *YYPARSE_PARAM], [YYPARSE_PARAM]])[
#else /* ! YYPARSE_PARAM */
]b4_c_function_def([yyparse], [int], b4_parse_param)[
#endif]])[
{]b4_pure_if([b4_declare_scanner_communication_variables
])b4_push_if([b4_pure_if([], [[
  int yypushed_char = yychar;
  YYSTYPE yypushed_val = yylval;]b4_locations_if([[
  YYLTYPE yypushed_loc = yylloc;]])
])],
  [b4_declare_parser_state_variables
])b4_lac_if([[
  int yy_lac_established = 0;]])[
  int yyn;
  int yyresult;
  /* Lookahead token as an internal (translated) token number.  */
  int yytoken;
  /* The variables used to return semantic value and location from the
     action routines.  */
  YYSTYPE yyval;]b4_locations_if([[
  YYLTYPE yyloc;]])[

#if YYERROR_VERBOSE
  /* Buffer for error messages, and its allocated size.  */
  char yymsgbuf[128];
  char *yymsg = yymsgbuf;
  YYSIZE_T yymsg_alloc = sizeof yymsgbuf;
#endif

#define YYPOPSTACK(N)   (yyvsp -= (N), yyssp -= (N)]b4_locations_if([, yylsp -= (N)])[)

  /* The number of symbols on the RHS of the reduced rule.
     Keep to zero when no symbol should be popped.  */
  int yylen = 0;]b4_push_if([[

  if (!yyps->yynew)
    {
      yyn = yypact[yystate];
      goto yyread_pushed_token;
    }]])[

  yytoken = 0;
  yyss = yyssa;
  yyvs = yyvsa;]b4_locations_if([[
  yyls = yylsa;]])[
  yystacksize = YYINITDEPTH;]b4_lac_if([[

  yyes = yyesa;
  yyes_capacity = sizeof yyesa / sizeof *yyes;
  if (YYMAXDEPTH < yyes_capacity)
    yyes_capacity = YYMAXDEPTH;]])[

  YYDPRINTF ((stderr, "Starting parse\n"));

  yystate = 0;
  yyerrstatus = 0;
  yynerrs = 0;
  yychar = YYEMPTY; /* Cause a token to be read.  */

  /* Initialize stack pointers.
     Waste one element of value and location stack
     so that they stay on the same level as the state stack.
     The wasted elements are never initialized.  */
  yyssp = yyss;
  yyvsp = yyvs;]b4_locations_if([[
  yylsp = yyls;

#if defined YYLTYPE_IS_TRIVIAL && YYLTYPE_IS_TRIVIAL
  /* Initialize the default location before parsing starts.  */
  yylloc.first_line   = yylloc.last_line   = ]b4_location_initial_line[;
  yylloc.first_column = yylloc.last_column = ]b4_location_initial_column[;
#endif]])
m4_ifdef([b4_initial_action],[
m4_pushdef([b4_at_dollar],     [m4_define([b4_at_dollar_used])yylloc])dnl
m4_pushdef([b4_dollar_dollar], [m4_define([b4_dollar_dollar_used])yylval])dnl
/* User initialization code.  */
b4_user_initial_action
m4_popdef([b4_dollar_dollar])dnl
m4_popdef([b4_at_dollar])])dnl
m4_ifdef([b4_dollar_dollar_used],[[  yyvsp[0] = yylval;
]])dnl
m4_ifdef([b4_at_dollar_used], [[  yylsp[0] = yylloc;
]])[
  goto yysetstate;

/*------------------------------------------------------------.
| yynewstate -- Push a new state, which is found in yystate.  |
`------------------------------------------------------------*/
 yynewstate:
  /* In all cases, when you get here, the value and location stacks
     have just been pushed.  So pushing a state here evens the stacks.  */
  yyssp++;

 yysetstate:
  *yyssp = yystate;

  if (yyss + yystacksize - 1 <= yyssp)
    {
      /* Get the current used size of the three stacks, in elements.  */
      YYSIZE_T yysize = yyssp - yyss + 1;

#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);
]b4_locations_if([
        yyls = yyls1;])[
        yyss = yyss1;
        yyvs = yyvs1;
      }
#else /* no yyoverflow */
# ifndef YYSTACK_RELOCATE
      goto yyexhaustedlab;
# else
      /* Extend the stack our own way.  */
      if (YYMAXDEPTH <= yystacksize)
        goto yyexhaustedlab;
      yystacksize *= 2;
      if (YYMAXDEPTH < yystacksize)
        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);])[
#  undef YYSTACK_RELOCATE
        if (yyss1 != yyssa)
          YYSTACK_FREE (yyss1);
      }
# endif
#endif /* no yyoverflow */

      yyssp = yyss + yysize - 1;
      yyvsp = yyvs + yysize - 1;]b4_locations_if([
      yylsp = yyls + yysize - 1;])[

      YYDPRINTF ((stderr, "Stack size increased to %lu\n",
                  (unsigned long int) yystacksize));

      if (yyss + yystacksize - 1 <= yyssp)
        YYABORT;
    }

  YYDPRINTF ((stderr, "Entering state %d\n", yystate));

  if (yystate == YYFINAL)
    YYACCEPT;

  goto yybackup;

/*-----------.
| yybackup.  |
`-----------*/
yybackup:

  /* Do appropriate processing given the current state.  Read a
     lookahead token if we need one and don't already have one.  */

  /* First try to decide what to do without reference to lookahead token.  */
  yyn = yypact[yystate];
  if (yypact_value_is_default (yyn))
    goto yydefault;

  /* Not known => get a lookahead token if don't already have one.  */

  /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol.  */
  if (yychar == YYEMPTY)
    {]b4_push_if([[
      if (!yyps->yynew)
        {]b4_use_push_for_pull_if([], [[
          YYDPRINTF ((stderr, "Return for a new token:\n"));]])[
          yyresult = YYPUSH_MORE;
          goto yypushreturn;
        }
      yyps->yynew = 0;]b4_pure_if([], [[
      /* Restoring the pushed token is only necessary for the first
         yypush_parse invocation since subsequent invocations don't overwrite
         it before jumping to yyread_pushed_token.  */
      yychar = yypushed_char;
      yylval = yypushed_val;]b4_locations_if([[
      yylloc = yypushed_loc;]])])[
yyread_pushed_token:]])[
      YYDPRINTF ((stderr, "Reading a token: "));]b4_push_if([b4_pure_if([[
      yychar = yypushed_char;
      if (yypushed_val)
        yylval = *yypushed_val;]b4_locations_if([[
      if (yypushed_loc)
        yylloc = *yypushed_loc;]])])], [[
      yychar = YYLEX;]])[
    }

  if (yychar <= YYEOF)
    {
      yychar = yytoken = YYEOF;
      YYDPRINTF ((stderr, "Now at end of input.\n"));
    }
  else
    {
      yytoken = YYTRANSLATE (yychar);
      YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc);
    }

  /* If the proper action on seeing token YYTOKEN is to reduce or to
     detect an error, take that action.  */
  yyn += yytoken;
  if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)]b4_lac_if([[
    {
      YY_LAC_ESTABLISH;
      goto yydefault;
    }]], [[
    goto yydefault;]])[
  yyn = yytable[yyn];
  if (yyn <= 0)
    {
      if (yytable_value_is_error (yyn))
        goto yyerrlab;]b4_lac_if([[
      YY_LAC_ESTABLISH;]])[
      yyn = -yyn;
      goto yyreduce;
    }

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

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

  /* Discard the shifted token.  */
  yychar = YYEMPTY;]b4_lac_if([[
  YY_LAC_DISCARD ("shift");]])[

  yystate = yyn;
  *++yyvsp = yylval;
]b4_locations_if([  *++yylsp = yylloc;])[
  goto yynewstate;


/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state.  |
`-----------------------------------------------------------*/
yydefault:
  yyn = yydefact[yystate];
  if (yyn == 0)
    goto yyerrlab;
  goto yyreduce;


/*-----------------------------.
| yyreduce -- Do a reduction.  |
`-----------------------------*/
yyreduce:
  /* yyn is the number of a rule to reduce with.  */
  yylen = yyr2[yyn];

  /* If YYLEN is nonzero, implement the default value of the action:
     `$$ = $1'.

     Otherwise, the following line sets YYVAL to garbage.
     This behavior is undocumented and Bison
     users should not rely upon it.  Assigning to YYVAL
     unconditionally makes the parser a bit smaller, and it avoids a
     GCC warning that YYVAL may be used uninitialized.  */
  yyval = yyvsp[1-yylen];

]b4_locations_if(
[[  /* Default location.  */
  YYLLOC_DEFAULT (yyloc, (yylsp - yylen), yylen);]])[
  YY_REDUCE_PRINT (yyn);]b4_lac_if([[
  {
    int yychar_backup = yychar;
    switch (yyn)
      {
        ]b4_user_actions[
        default: break;
      }
    if (yychar_backup != yychar)
      YY_LAC_DISCARD ("yychar change");
  }]], [[
  switch (yyn)
    {
      ]b4_user_actions[
      default: break;
    }]])[
  /* User semantic actions sometimes alter yychar, and that requires
     that yytoken be updated with the new translation.  We take the
     approach of translating immediately before every use of yytoken.
     One alternative is translating here after every semantic action,
     but that translation would be missed if the semantic action invokes
     YYABORT, YYACCEPT, or YYERROR immediately after altering yychar or
     if it invokes YYBACKUP.  In the case of YYABORT or YYACCEPT, an
     incorrect destructor might then be invoked immediately.  In the
     case of YYERROR or YYBACKUP, subsequent parser actions might lead
     to an incorrect destructor call or verbose syntax error message
     before the lookahead is translated.  */
  YY_SYMBOL_PRINT ("-> $$ =", yyr1[yyn], &yyval, &yyloc);

  YYPOPSTACK (yylen);
  yylen = 0;
  YY_STACK_PRINT (yyss, yyssp);

  *++yyvsp = yyval;]b4_locations_if([
  *++yylsp = yyloc;])[

  /* Now `shift' the result of the reduction.  Determine what state
     that goes to, based on the state we popped back to and the rule
     number reduced by.  */

  yyn = yyr1[yyn];

  yystate = yypgoto[yyn - YYNTOKENS] + *yyssp;
  if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == *yyssp)
    yystate = yytable[yystate];
  else
    yystate = yydefgoto[yyn - YYNTOKENS];

  goto yynewstate;


/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
yyerrlab:
  /* Make sure we have latest lookahead translation.  See comments at
     user semantic actions for why this is necessary.  */
  yytoken = yychar == YYEMPTY ? YYEMPTY : YYTRANSLATE (yychar);

  /* If not already recovering from an error, report this error.  */
  if (!yyerrstatus)
    {
      ++yynerrs;
#if ! YYERROR_VERBOSE
      yyerror (]b4_yyerror_args[YY_("syntax error"));
#else
# define YYSYNTAX_ERROR yysyntax_error (&yymsg_alloc, &yymsg, \]b4_lac_if([[
                                        yyesa, &yyes, &yyes_capacity, \]])[
                                        yyssp, yytoken)
      {
        char const *yymsgp = YY_("syntax error");
        int yysyntax_error_status;]b4_lac_if([[
        if (yychar != YYEMPTY)
          YY_LAC_ESTABLISH;]])[
        yysyntax_error_status = YYSYNTAX_ERROR;
        if (yysyntax_error_status == 0)
          yymsgp = yymsg;
        else if (yysyntax_error_status == 1)
          {
            if (yymsg != yymsgbuf)
              YYSTACK_FREE (yymsg);
            yymsg = (char *) YYSTACK_ALLOC (yymsg_alloc);
            if (!yymsg)
              {
                yymsg = yymsgbuf;
                yymsg_alloc = sizeof yymsgbuf;
                yysyntax_error_status = 2;
              }
            else
              {
                yysyntax_error_status = YYSYNTAX_ERROR;
                yymsgp = yymsg;
              }
          }
        yyerror (]b4_yyerror_args[yymsgp);
        if (yysyntax_error_status == 2)
          goto yyexhaustedlab;
      }
# undef YYSYNTAX_ERROR
#endif
    }

]b4_locations_if([[  yyerror_range[1] = yylloc;]])[

  if (yyerrstatus == 3)
    {
      /* If just tried and failed to reuse lookahead token after an
         error, discard it.  */

      if (yychar <= YYEOF)
        {
          /* Return failure if at end of input.  */
          if (yychar == YYEOF)
            YYABORT;
        }
      else
        {
          yydestruct ("Error: discarding",
                      yytoken, &yylval]b4_locations_if([, &yylloc])[]b4_user_args[);
          yychar = YYEMPTY;
        }
    }

  /* Else will try to reuse lookahead token after shifting the error
     token.  */
  goto yyerrlab1;


/*---------------------------------------------------.
| yyerrorlab -- error raised explicitly by YYERROR.  |
`---------------------------------------------------*/
yyerrorlab:

  /* Pacify compilers like GCC when the user code never invokes
     YYERROR and the label yyerrorlab therefore never appears in user
     code.  */
  if (/*CONSTCOND*/ 0)
     goto yyerrorlab;

]b4_locations_if([[  yyerror_range[1] = yylsp[1-yylen];
]])[  /* Do not reclaim the symbols of the rule which action triggered
     this YYERROR.  */
  YYPOPSTACK (yylen);
  yylen = 0;
  YY_STACK_PRINT (yyss, yyssp);
  yystate = *yyssp;
  goto yyerrlab1;


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

      /* Pop the current state because it cannot handle the error token.  */
      if (yyssp == yyss)
        YYABORT;

]b4_locations_if([[      yyerror_range[1] = *yylsp;]])[
      yydestruct ("Error: popping",
                  yystos[yystate], yyvsp]b4_locations_if([, yylsp])[]b4_user_args[);
      YYPOPSTACK (1);
      yystate = *yyssp;
      YY_STACK_PRINT (yyss, yyssp);
    }]b4_lac_if([[

  /* If the stack popping above didn't lose the initial context for the
     current lookahead token, the shift below will for sure.  */
  YY_LAC_DISCARD ("error recovery");]])[

  *++yyvsp = yylval;
]b4_locations_if([[
  yyerror_range[2] = yylloc;
  /* Using YYLLOC is tempting, but would change the location of
     the lookahead.  YYLOC is available though.  */
  YYLLOC_DEFAULT (yyloc, yyerror_range, 2);
  *++yylsp = yyloc;]])[

  /* Shift the error token.  */
  YY_SYMBOL_PRINT ("Shifting", yystos[yyn], yyvsp, yylsp);

  yystate = yyn;
  goto yynewstate;


/*-------------------------------------.
| yyacceptlab -- YYACCEPT comes here.  |
`-------------------------------------*/
yyacceptlab:
  yyresult = 0;
  goto yyreturn;

/*-----------------------------------.
| yyabortlab -- YYABORT comes here.  |
`-----------------------------------*/
yyabortlab:
  yyresult = 1;
  goto yyreturn;

#if ]b4_lac_if([[1]], [[!defined yyoverflow || YYERROR_VERBOSE]])[
/*-------------------------------------------------.
| yyexhaustedlab -- memory exhaustion comes here.  |
`-------------------------------------------------*/
yyexhaustedlab:
  yyerror (]b4_yyerror_args[YY_("memory exhausted"));
  yyresult = 2;
  /* Fall through.  */
#endif

yyreturn:
  if (yychar != YYEMPTY)
    {
      /* Make sure we have latest lookahead translation.  See comments at
         user semantic actions for why this is necessary.  */
      yytoken = YYTRANSLATE (yychar);
      yydestruct ("Cleanup: discarding lookahead",
                  yytoken, &yylval]b4_locations_if([, &yylloc])[]b4_user_args[);
    }
  /* Do not reclaim the symbols of the rule which action triggered
     this YYABORT or YYACCEPT.  */
  YYPOPSTACK (yylen);
  YY_STACK_PRINT (yyss, yyssp);
  while (yyssp != yyss)
    {
      yydestruct ("Cleanup: popping",
                  yystos[*yyssp], yyvsp]b4_locations_if([, yylsp])[]b4_user_args[);
      YYPOPSTACK (1);
    }
#ifndef yyoverflow
  if (yyss != yyssa)
    YYSTACK_FREE (yyss);
#endif]b4_lac_if([[
  if (yyes != yyesa)
    YYSTACK_FREE (yyes);]])b4_push_if([[
  yyps->yynew = 1;

yypushreturn:]])[
#if YYERROR_VERBOSE
  if (yymsg != yymsgbuf)
    YYSTACK_FREE (yymsg);
#endif
  /* Make sure YYID is used.  */
  return YYID (yyresult);
}

]b4_epilogue[]dnl
b4_defines_if(
[@output(b4_spec_defines_file@)@
b4_copyright([Bison interface for Yacc-like parsers in C])[

]b4_shared_declarations[
]])dnl b4_defines_if
m4_divert_pop(0)
m4_popdef([b4_copyright_years])