kc3-lang/angle/src/compiler/preprocessor/ExpressionParser.cpp

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• Hash : a3d384ad
  Author :
  Date : 2017-10-06T16:12:50
  

  Fix signed integer overflow in GLSL preprocessor left shift
  
  Signed integer overflow is undefined in C++, whereas unsigned integer
  overflow is not. Always cast left shift operand to unsigned to avoid
  UB.
  
  On common compilers, the behavior was already the same before this
  patch, so this patch is done mostly for the benefit of automated fuzz
  testing.
  
  BUG=chromium:743136
  TEST=angle_unittests
  
  Change-Id: I7aab939036bb19a37f258cef4297b560da3cd9d5
  Reviewed-on: https://chromium-review.googlesource.com/704659
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/preprocessor/ExpressionParser.cpp

• /* A Bison parser, made by GNU Bison 3.0.4.  */
  
  /* Bison implementation for Yacc-like parsers in C
  
     Copyright (C) 1984, 1989-1990, 2000-2015 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     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/>.  */
  
  /* As a special exception, you may create a larger work that contains
     part or all of the Bison parser skeleton and distribute that work
     under terms of your choice, so long as that work isn't itself a
     parser generator using the skeleton or a modified version thereof
     as a parser skeleton.  Alternatively, if you modify or redistribute
     the parser skeleton itself, you may (at your option) remove this
     special exception, which will cause the skeleton and the resulting
     Bison output files to be licensed under the GNU General Public
     License without this special exception.
  
     This special exception was added by the Free Software Foundation in
     version 2.2 of Bison.  */
  
  /* 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.  */
  
  /* Identify Bison output.  */
  #define YYBISON 1
  
  /* Bison version.  */
  #define YYBISON_VERSION "3.0.4"
  
  /* Skeleton name.  */
  #define YYSKELETON_NAME "yacc.c"
  
  /* Pure parsers.  */
  #define YYPURE 1
  
  /* Push parsers.  */
  #define YYPUSH 0
  
  /* Pull parsers.  */
  #define YYPULL 1
  
  
  /* Substitute the variable and function names.  */
  #define yyparse         ppparse
  #define yylex           pplex
  #define yyerror         pperror
  #define yydebug         ppdebug
  #define yynerrs         ppnerrs
  
  
  /* Copy the first part of user declarations.  */
  
  
  //
  // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // This file is auto-generated by generate_parser.sh. DO NOT EDIT!
  
  #if defined(__GNUC__)
  // Triggered by the auto-generated pplval variable.
  #if !defined(__clang__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
  #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
  #else
  #pragma GCC diagnostic ignored "-Wuninitialized"
  #endif
  #elif defined(_MSC_VER)
  #pragma warning(disable: 4065 4244 4701 4702)
  #endif
  
  #include "ExpressionParser.h"
  
  #if defined(_MSC_VER)
  #include <malloc.h>
  #else
  #include <stdlib.h>
  #endif
  
  #include <cassert>
  #include <sstream>
  #include <stdint.h>
  
  #include "DiagnosticsBase.h"
  #include "Lexer.h"
  #include "Token.h"
  #include "common/mathutil.h"
  
  typedef int32_t YYSTYPE;
  typedef uint32_t UNSIGNED_TYPE;
  
  #define YYENABLE_NLS 0
  #define YYLTYPE_IS_TRIVIAL 1
  #define YYSTYPE_IS_TRIVIAL 1
  #define YYSTYPE_IS_DECLARED 1
  
  namespace {
  struct Context
  {
      pp::Diagnostics* diagnostics;
      pp::Lexer* lexer;
      pp::Token* token;
      int* result;
      bool parsePresetToken;
  
      pp::ExpressionParser::ErrorSettings errorSettings;
      bool *valid;
  
      void startIgnoreErrors() { ++ignoreErrors; }
      void endIgnoreErrors() { --ignoreErrors; }
  
      bool isIgnoringErrors() { return ignoreErrors > 0; }
  
      int ignoreErrors;
  };
  }  // namespace
  
  
  static int yylex(YYSTYPE* lvalp, Context* context);
  static void yyerror(Context* context, const char* reason);
  
  
  
  # ifndef YY_NULLPTR
  #  if defined __cplusplus && 201103L <= __cplusplus
  #   define YY_NULLPTR nullptr
  #  else
  #   define YY_NULLPTR 0
  #  endif
  # endif
  
  /* Enabling verbose error messages.  */
  #ifdef YYERROR_VERBOSE
  # undef YYERROR_VERBOSE
  # define YYERROR_VERBOSE 1
  #else
  # define YYERROR_VERBOSE 0
  #endif
  
  
  /* Debug traces.  */
  #ifndef YYDEBUG
  # define YYDEBUG 0
  #endif
  #if YYDEBUG
  extern int ppdebug;
  #endif
  
  /* Token type.  */
  #ifndef YYTOKENTYPE
  # define YYTOKENTYPE
    enum yytokentype
    {
      TOK_CONST_INT = 258,
      TOK_IDENTIFIER = 259,
      TOK_OP_OR = 260,
      TOK_OP_AND = 261,
      TOK_OP_EQ = 262,
      TOK_OP_NE = 263,
      TOK_OP_LE = 264,
      TOK_OP_GE = 265,
      TOK_OP_LEFT = 266,
      TOK_OP_RIGHT = 267,
      TOK_UNARY = 268
    };
  #endif
  
  /* Value type.  */
  #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
  typedef int YYSTYPE;
  # define YYSTYPE_IS_TRIVIAL 1
  # define YYSTYPE_IS_DECLARED 1
  #endif
  
  
  
  int ppparse (Context *context);
  
  
  
  /* Copy the second part of user declarations.  */
  
  
  
  #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;
  #else
  typedef signed char 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
  #  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
  
  #ifndef YY_ATTRIBUTE
  # if (defined __GNUC__                                               \
        && (2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)))  \
       || defined __SUNPRO_C && 0x5110 <= __SUNPRO_C
  #  define YY_ATTRIBUTE(Spec) __attribute__(Spec)
  # else
  #  define YY_ATTRIBUTE(Spec) /* empty */
  # endif
  #endif
  
  #ifndef YY_ATTRIBUTE_PURE
  # define YY_ATTRIBUTE_PURE   YY_ATTRIBUTE ((__pure__))
  #endif
  
  #ifndef YY_ATTRIBUTE_UNUSED
  # define YY_ATTRIBUTE_UNUSED YY_ATTRIBUTE ((__unused__))
  #endif
  
  #if !defined _Noreturn \
       && (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112)
  # if defined _MSC_VER && 1200 <= _MSC_VER
  #  define _Noreturn __declspec (noreturn)
  # else
  #  define _Noreturn YY_ATTRIBUTE ((__noreturn__))
  # 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
  
  #if defined __GNUC__ && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
  /* Suppress an incorrect diagnostic about yylval being uninitialized.  */
  # define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN \
      _Pragma ("GCC diagnostic push") \
      _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")\
      _Pragma ("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
  # define YY_IGNORE_MAYBE_UNINITIALIZED_END \
      _Pragma ("GCC diagnostic pop")
  #else
  # define YY_INITIAL_VALUE(Value) Value
  #endif
  #ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
  # define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
  # define YY_IGNORE_MAYBE_UNINITIALIZED_END
  #endif
  #ifndef YY_INITIAL_VALUE
  # define YY_INITIAL_VALUE(Value) /* Nothing. */
  #endif
  
  
  #if ! defined yyoverflow || YYERROR_VERBOSE
  
  /* The parser invokes alloca or malloc; define the necessary symbols.  */
  
  # 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
  #     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 (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
  void *malloc (YYSIZE_T); /* INFRINGES ON USER NAME SPACE */
  #   endif
  #  endif
  #  ifndef YYFREE
  #   define YYFREE free
  #   if ! defined free && ! defined EXIT_SUCCESS
  void free (void *); /* INFRINGES ON USER NAME SPACE */
  #   endif
  #  endif
  # endif
  #endif /* ! defined yyoverflow || YYERROR_VERBOSE */
  
  
  #if (! defined yyoverflow \
       && (! defined __cplusplus \
           || (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;
  };
  
  /* 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.  */
  # 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 (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 (0)
  #  endif
  # endif
  #endif /* !YYCOPY_NEEDED */
  
  /* YYFINAL -- State number of the termination state.  */
  #define YYFINAL  15
  /* YYLAST -- Last index in YYTABLE.  */
  #define YYLAST   176
  
  /* YYNTOKENS -- Number of terminals.  */
  #define YYNTOKENS  28
  /* YYNNTS -- Number of nonterminals.  */
  #define YYNNTS  5
  /* YYNRULES -- Number of rules.  */
  #define YYNRULES  29
  /* YYNSTATES -- Number of states.  */
  #define YYNSTATES  55
  
  /* YYTRANSLATE[YYX] -- Symbol number corresponding to YYX as returned
     by yylex, with out-of-bounds checking.  */
  #define YYUNDEFTOK  2
  #define YYMAXUTOK   268
  
  #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 yytype_uint8 yytranslate[] =
  {
         0,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,    24,     2,     2,     2,    22,     9,     2,
        26,    27,    20,    18,     2,    19,     2,    21,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
        12,     2,    13,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     8,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     7,     2,    25,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
         2,     2,     2,     2,     2,     2,     1,     2,     3,     4,
         5,     6,    10,    11,    14,    15,    16,    17,    23
  };
  
  #if YYDEBUG
    /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
  static const yytype_uint16 yyrline[] = {0,   108, 108, 115, 116, 127, 127, 148, 148, 169,
                                          172, 175, 178, 181, 184, 187, 190, 193, 196, 221,
                                          243, 246, 249, 275, 302, 305, 308, 311, 323, 326};
  #endif
  
  #if YYDEBUG || YYERROR_VERBOSE || 0
  /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
     First, the terminals, then, starting at YYNTOKENS, nonterminals.  */
  static const char *const yytname[] =
  {
    "$end", "error", "$undefined", "TOK_CONST_INT", "TOK_IDENTIFIER",
    "TOK_OP_OR", "TOK_OP_AND", "'|'", "'^'", "'&'", "TOK_OP_EQ", "TOK_OP_NE",
    "'<'", "'>'", "TOK_OP_LE", "TOK_OP_GE", "TOK_OP_LEFT", "TOK_OP_RIGHT",
    "'+'", "'-'", "'*'", "'/'", "'%'", "TOK_UNARY", "'!'", "'~'", "'('",
    "')'", "$accept", "input", "expression", "$@1", "$@2", YY_NULLPTR
  };
  #endif
  
  # ifdef YYPRINT
  /* YYTOKNUM[NUM] -- (External) token number corresponding to the
     (internal) symbol number NUM (which must be that of a token).  */
  static const yytype_uint16 yytoknum[] =
  {
         0,   256,   257,   258,   259,   260,   261,   124,    94,    38,
       262,   263,    60,    62,   264,   265,   266,   267,    43,    45,
        42,    47,    37,   268,    33,   126,    40,    41
  };
  # endif
  
  #define YYPACT_NINF -12
  
  #define yypact_value_is_default(Yystate) \
    (!!((Yystate) == (-12)))
  
  #define YYTABLE_NINF -1
  
  #define yytable_value_is_error(Yytable_value) \
    0
  
    /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
       STATE-NUM.  */
  static const yytype_int16 yypact[] =
  {
        31,   -12,   -12,    31,    31,    31,    31,    31,    51,    76,
       -12,   -12,   -12,   -12,    53,   -12,   -12,   -12,    31,    31,
        31,    31,    31,    31,    31,    31,    31,    31,    31,    31,
        31,    31,    31,    31,   -12,    31,    31,   124,   138,    26,
       149,   149,   -11,   -11,   -11,   -11,   154,   154,    -8,    -8,
       -12,   -12,   -12,    93,   109
  };
  
    /* YYDEFACT[STATE-NUM] -- Default reduction number in state STATE-NUM.
       Performed when YYTABLE does not specify something else to do.  Zero
       means the default is an error.  */
  static const yytype_uint8 yydefact[] =
  {
         0,     3,     4,     0,     0,     0,     0,     0,     0,     2,
        28,    27,    25,    26,     0,     1,     5,     7,     0,     0,
         0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
         0,     0,     0,     0,    29,     0,     0,     9,    10,    11,
        13,    12,    17,    16,    15,    14,    19,    18,    21,    20,
        24,    23,    22,     6,     8
  };
  
    /* YYPGOTO[NTERM-NUM].  */
  static const yytype_int8 yypgoto[] =
  {
       -12,   -12,    -3,   -12,   -12
  };
  
    /* YYDEFGOTO[NTERM-NUM].  */
  static const yytype_int8 yydefgoto[] =
  {
        -1,     8,     9,    35,    36
  };
  
    /* YYTABLE[YYPACT[STATE-NUM]] -- What to do in state STATE-NUM.  If
       positive, shift that token.  If negative, reduce the rule whose
       number is the opposite.  If YYTABLE_NINF, syntax error.  */
  static const yytype_uint8 yytable[] =
  {
        10,    11,    12,    13,    14,    27,    28,    29,    30,    31,
        32,    33,    31,    32,    33,    37,    38,    39,    40,    41,
        42,    43,    44,    45,    46,    47,    48,    49,    50,    51,
        52,     0,    53,    54,     1,     2,    21,    22,    23,    24,
        25,    26,    27,    28,    29,    30,    31,    32,    33,     3,
         4,    15,     0,     0,     0,     5,     6,     7,    16,    17,
        18,    19,    20,    21,    22,    23,    24,    25,    26,    27,
        28,    29,    30,    31,    32,    33,     0,     0,     0,     0,
        34,    16,    17,    18,    19,    20,    21,    22,    23,    24,
        25,    26,    27,    28,    29,    30,    31,    32,    33,    17,
        18,    19,    20,    21,    22,    23,    24,    25,    26,    27,
        28,    29,    30,    31,    32,    33,    18,    19,    20,    21,
        22,    23,    24,    25,    26,    27,    28,    29,    30,    31,
        32,    33,    19,    20,    21,    22,    23,    24,    25,    26,
        27,    28,    29,    30,    31,    32,    33,    20,    21,    22,
        23,    24,    25,    26,    27,    28,    29,    30,    31,    32,
        33,    23,    24,    25,    26,    27,    28,    29,    30,    31,
        32,    33,    29,    30,    31,    32,    33
  };
  
  static const yytype_int8 yycheck[] =
  {
         3,     4,     5,     6,     7,    16,    17,    18,    19,    20,
        21,    22,    20,    21,    22,    18,    19,    20,    21,    22,
        23,    24,    25,    26,    27,    28,    29,    30,    31,    32,
        33,    -1,    35,    36,     3,     4,    10,    11,    12,    13,
        14,    15,    16,    17,    18,    19,    20,    21,    22,    18,
        19,     0,    -1,    -1,    -1,    24,    25,    26,     5,     6,
         7,     8,     9,    10,    11,    12,    13,    14,    15,    16,
        17,    18,    19,    20,    21,    22,    -1,    -1,    -1,    -1,
        27,     5,     6,     7,     8,     9,    10,    11,    12,    13,
        14,    15,    16,    17,    18,    19,    20,    21,    22,     6,
         7,     8,     9,    10,    11,    12,    13,    14,    15,    16,
        17,    18,    19,    20,    21,    22,     7,     8,     9,    10,
        11,    12,    13,    14,    15,    16,    17,    18,    19,    20,
        21,    22,     8,     9,    10,    11,    12,    13,    14,    15,
        16,    17,    18,    19,    20,    21,    22,     9,    10,    11,
        12,    13,    14,    15,    16,    17,    18,    19,    20,    21,
        22,    12,    13,    14,    15,    16,    17,    18,    19,    20,
        21,    22,    18,    19,    20,    21,    22
  };
  
    /* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
       symbol of state STATE-NUM.  */
  static const yytype_uint8 yystos[] =
  {
         0,     3,     4,    18,    19,    24,    25,    26,    29,    30,
        30,    30,    30,    30,    30,     0,     5,     6,     7,     8,
         9,    10,    11,    12,    13,    14,    15,    16,    17,    18,
        19,    20,    21,    22,    27,    31,    32,    30,    30,    30,
        30,    30,    30,    30,    30,    30,    30,    30,    30,    30,
        30,    30,    30,    30,    30
  };
  
    /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
  static const yytype_uint8 yyr1[] =
  {
         0,    28,    29,    30,    30,    31,    30,    32,    30,    30,
        30,    30,    30,    30,    30,    30,    30,    30,    30,    30,
        30,    30,    30,    30,    30,    30,    30,    30,    30,    30
  };
  
    /* YYR2[YYN] -- Number of symbols on the right hand side of rule YYN.  */
  static const yytype_uint8 yyr2[] =
  {
         0,     2,     1,     1,     1,     0,     4,     0,     4,     3,
         3,     3,     3,     3,     3,     3,     3,     3,     3,     3,
         3,     3,     3,     3,     3,     2,     2,     2,     2,     3
  };
  
  
  #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 YYRECOVERING()  (!!yyerrstatus)
  
  #define YYBACKUP(Token, Value)                                  \
  do                                                              \
    if (yychar == YYEMPTY)                                        \
      {                                                           \
        yychar = (Token);                                         \
        yylval = (Value);                                         \
        YYPOPSTACK (yylen);                                       \
        yystate = *yyssp;                                         \
        goto yybackup;                                            \
      }                                                           \
    else                                                          \
      {                                                           \
        yyerror (context, YY_("syntax error: cannot back up")); \
        YYERROR;                                                  \
      }                                                           \
  while (0)
  
  /* Error token number */
  #define YYTERROR        1
  #define YYERRCODE       256
  
  
  
  /* 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 (0)
  
  /* This macro is provided for backward compatibility. */
  #ifndef YY_LOCATION_PRINT
  # define YY_LOCATION_PRINT(File, Loc) ((void) 0)
  #endif
  
  
  # define YY_SYMBOL_PRINT(Title, Type, Value, Location)                    \
  do {                                                                      \
    if (yydebug)                                                            \
      {                                                                     \
        YYFPRINTF (stderr, "%s ", Title);                                   \
        yy_symbol_print (stderr,                                            \
                    Type, Value, context); \
        YYFPRINTF (stderr, "\n");                                           \
      }                                                                     \
  } while (0)
  
  
  /*----------------------------------------.
  | Print this symbol's value on YYOUTPUT.  |
  `----------------------------------------*/
  
  static void
  yy_symbol_value_print (FILE *yyoutput, int yytype, YYSTYPE const * const yyvaluep, Context *context)
  {
    FILE *yyo = yyoutput;
    YYUSE (yyo);
    YYUSE (context);
    if (!yyvaluep)
      return;
  # ifdef YYPRINT
    if (yytype < YYNTOKENS)
      YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
  # endif
    YYUSE (yytype);
  }
  
  
  /*--------------------------------.
  | Print this symbol on YYOUTPUT.  |
  `--------------------------------*/
  
  static void
  yy_symbol_print (FILE *yyoutput, int yytype, YYSTYPE const * const yyvaluep, Context *context)
  {
    YYFPRINTF (yyoutput, "%s %s (",
               yytype < YYNTOKENS ? "token" : "nterm", yytname[yytype]);
  
    yy_symbol_value_print (yyoutput, yytype, yyvaluep, context);
    YYFPRINTF (yyoutput, ")");
  }
  
  /*------------------------------------------------------------------.
  | yy_stack_print -- Print the state stack from its BOTTOM up to its |
  | TOP (included).                                                   |
  `------------------------------------------------------------------*/
  
  static void
  yy_stack_print (yytype_int16 *yybottom, yytype_int16 *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 (0)
  
  
  /*------------------------------------------------.
  | Report that the YYRULE is going to be reduced.  |
  `------------------------------------------------*/
  
  static void
  yy_reduce_print (yytype_int16 *yyssp, YYSTYPE *yyvsp, int yyrule, Context *context)
  {
    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]],
                         &(yyvsp[(yyi + 1) - (yynrhs)])
                                                , context);
        YYFPRINTF (stderr, "\n");
      }
  }
  
  # define YY_REDUCE_PRINT(Rule)          \
  do {                                    \
    if (yydebug)                          \
      yy_reduce_print (yyssp, yyvsp, Rule, context); \
  } while (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 200
  #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 10000
  #endif
  
  
  #if YYERROR_VERBOSE
  
  # ifndef yystrlen
  #  if defined __GLIBC__ && defined _STRING_H
  #   define yystrlen strlen
  #  else
  /* Return the length of YYSTR.  */
  static YYSIZE_T
  yystrlen (const char *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.  */
  static char *
  yystpcpy (char *yydest, const char *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.
  
     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.  */
  static int
  yysyntax_error (YYSIZE_T *yymsg_alloc, char **yymsg,
                  yytype_int16 *yyssp, int yytoken)
  {
    YYSIZE_T yysize0 = yytnamerr (YY_NULLPTR, yytname[yytoken]);
    YYSIZE_T yysize = yysize0;
    enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
    /* Internationalized format string. */
    const char *yyformat = YY_NULLPTR;
    /* 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:
       - 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.
       - 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];
        yyarg[yycount++] = yytname[yytoken];
        if (!yypact_value_is_default (yyn))
          {
            /* 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;
  
            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];
                  {
                    YYSIZE_T yysize1 = yysize + yytnamerr (YY_NULLPTR, yytname[yyx]);
                    if (! (yysize <= yysize1
                           && yysize1 <= YYSTACK_ALLOC_MAXIMUM))
                      return 2;
                    yysize = yysize1;
                  }
                }
          }
      }
  
    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_
      }
  
    {
      YYSIZE_T 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 */
  
  /*-----------------------------------------------.
  | Release the memory associated to this symbol.  |
  `-----------------------------------------------*/
  
  static void
  yydestruct (const char *yymsg, int yytype, YYSTYPE *yyvaluep, Context *context)
  {
    YYUSE (yyvaluep);
    YYUSE (context);
    if (!yymsg)
      yymsg = "Deleting";
    YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
  
    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
    YYUSE (yytype);
    YY_IGNORE_MAYBE_UNINITIALIZED_END
  }
  
  
  
  
  /*----------.
  | yyparse.  |
  `----------*/
  
  int
  yyparse (Context *context)
  {
  /* The lookahead symbol.  */
  int yychar;
  
  
  /* The semantic value of the lookahead symbol.  */
  /* Default value used for initialization, for pacifying older GCCs
     or non-GCC compilers.  */
  YY_INITIAL_VALUE (static YYSTYPE yyval_default;)
  YYSTYPE yylval YY_INITIAL_VALUE (= yyval_default);
  
      /* 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.
  
         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;
  
      YYSIZE_T yystacksize;
  
    int yyn;
    int yyresult;
    /* Lookahead token as an internal (translated) token number.  */
    int yytoken = 0;
    /* The variables used to return semantic value and location from the
       action routines.  */
    YYSTYPE yyval;
  
  #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))
  
    /* The number of symbols on the RHS of the reduced rule.
       Keep to zero when no symbol should be popped.  */
    int yylen = 0;
  
    yyssp = yyss = yyssa;
    yyvsp = yyvs = yyvsa;
    yystacksize = YYINITDEPTH;
  
    YYDPRINTF ((stderr, "Starting parse\n"));
  
    yystate = 0;
    yyerrstatus = 0;
    yynerrs = 0;
    yychar = YYEMPTY; /* Cause a token to be read.  */
    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;
  
          /* 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),
                      &yystacksize);
  
          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);
  #  undef YYSTACK_RELOCATE
          if (yyss1 != yyssa)
            YYSTACK_FREE (yyss1);
        }
  # endif
  #endif /* no yyoverflow */
  
        yyssp = yyss + yysize - 1;
        yyvsp = yyvs + 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)
      {
        YYDPRINTF ((stderr, "Reading a token: "));
        yychar = yylex (&yylval, context);
      }
  
    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)
      goto yydefault;
    yyn = yytable[yyn];
    if (yyn <= 0)
      {
        if (yytable_value_is_error (yyn))
          goto yyerrlab;
        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;
  
    yystate = yyn;
    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
    *++yyvsp = yylval;
    YY_IGNORE_MAYBE_UNINITIALIZED_END
  
    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];
  
  
    YY_REDUCE_PRINT (yyn);
    switch (yyn)
      {
          case 2:
  
      {
          *(context->result) = static_cast<int>((yyvsp[0]));
          YYACCEPT;
      }
  
      break;
  
    case 4:
  
      {
          if (!context->isIgnoringErrors())
          {
              // This rule should be applied right after the token is lexed, so we can
              // refer to context->token in the error message.
              context->diagnostics->report(context->errorSettings.unexpectedIdentifier,
                                           context->token->location, context->token->text);
              *(context->valid) = false;
          }
          (yyval) = (yyvsp[0]);
      }
  
      break;
  
    case 5:
  
      {
          if ((yyvsp[-1]) != 0)
          {
              // Ignore errors in the short-circuited part of the expression.
              // ESSL3.00 section 3.4:
              // If an operand is not evaluated, the presence of undefined identifiers
              // in the operand will not cause an error.
              // Unevaluated division by zero should not cause an error either.
              context->startIgnoreErrors();
          }
      }
  
      break;
  
    case 6:
  
      {
          if ((yyvsp[-3]) != 0)
          {
              context->endIgnoreErrors();
              (yyval) = static_cast<YYSTYPE>(1);
          }
          else
          {
              (yyval) = (yyvsp[-3]) || (yyvsp[0]);
          }
      }
  
      break;
  
    case 7:
  
      {
          if ((yyvsp[-1]) == 0)
          {
              // Ignore errors in the short-circuited part of the expression.
              // ESSL3.00 section 3.4:
              // If an operand is not evaluated, the presence of undefined identifiers
              // in the operand will not cause an error.
              // Unevaluated division by zero should not cause an error either.
              context->startIgnoreErrors();
          }
      }
  
      break;
  
    case 8:
  
      {
          if ((yyvsp[-3]) == 0)
          {
              context->endIgnoreErrors();
              (yyval) = static_cast<YYSTYPE>(0);
          }
          else
          {
              (yyval) = (yyvsp[-3]) && (yyvsp[0]);
          }
      }
  
      break;
  
    case 9:
  
      {
          (yyval) = (yyvsp[-2]) | (yyvsp[0]);
      }
  
      break;
  
    case 10:
  
      {
          (yyval) = (yyvsp[-2]) ^ (yyvsp[0]);
      }
  
      break;
  
    case 11:
  
      {
          (yyval) = (yyvsp[-2]) & (yyvsp[0]);
      }
  
      break;
  
    case 12:
  
      {
          (yyval) = (yyvsp[-2]) != (yyvsp[0]);
      }
  
      break;
  
    case 13:
  
      {
          (yyval) = (yyvsp[-2]) == (yyvsp[0]);
      }
  
      break;
  
    case 14:
  
      {
          (yyval) = (yyvsp[-2]) >= (yyvsp[0]);
      }
  
      break;
  
    case 15:
  
      {
          (yyval) = (yyvsp[-2]) <= (yyvsp[0]);
      }
  
      break;
  
    case 16:
  
      {
          (yyval) = (yyvsp[-2]) > (yyvsp[0]);
      }
  
      break;
  
    case 17:
  
      {
          (yyval) = (yyvsp[-2]) < (yyvsp[0]);
      }
  
      break;
  
    case 18:
  
      {
          if ((yyvsp[0]) < 0 || (yyvsp[0]) > 31)
          {
              if (!context->isIgnoringErrors())
              {
                  std::ostringstream stream;
                  stream << (yyvsp[-2]) << " >> " << (yyvsp[0]);
                  std::string text = stream.str();
                  context->diagnostics->report(pp::Diagnostics::PP_UNDEFINED_SHIFT,
                                               context->token->location,
                                               text.c_str());
                  *(context->valid) = false;
              }
              (yyval) = static_cast<YYSTYPE>(0);
          }
          else if ((yyvsp[-2]) < 0)
          {
              // Logical shift right.
              (yyval) = static_cast<YYSTYPE>(static_cast<UNSIGNED_TYPE>((yyvsp[-2])) >> (yyvsp[0]));
          }
          else
          {
              (yyval) = (yyvsp[-2]) >> (yyvsp[0]);
          }
      }
  
      break;
  
    case 19:
  
      {
          if ((yyvsp[0]) < 0 || (yyvsp[0]) > 31)
          {
              if (!context->isIgnoringErrors())
              {
                  std::ostringstream stream;
                  stream << (yyvsp[-2]) << " << " << (yyvsp[0]);
                  std::string text = stream.str();
                  context->diagnostics->report(pp::Diagnostics::PP_UNDEFINED_SHIFT,
                                               context->token->location,
                                               text.c_str());
                  *(context->valid) = false;
              }
              (yyval) = static_cast<YYSTYPE>(0);
          }
          else
          {
              // Logical shift left. Casting to unsigned is needed to ensure there's no signed integer
              // overflow, which some tools treat as an error.
              (yyval) = static_cast<YYSTYPE>(static_cast<UNSIGNED_TYPE>((yyvsp[-2])) << (yyvsp[0]));
          }
      }
  
      break;
  
    case 20:
  
      {
          (yyval) = gl::WrappingDiff<YYSTYPE>((yyvsp[-2]), (yyvsp[0]));
      }
  
      break;
  
    case 21:
  
      {
          (yyval) = gl::WrappingSum<YYSTYPE>((yyvsp[-2]), (yyvsp[0]));
      }
  
      break;
  
    case 22:
  
      {
          if ((yyvsp[0]) == 0)
          {
              if (!context->isIgnoringErrors())
              {
                  std::ostringstream stream;
                  stream << (yyvsp[-2]) << " % " << (yyvsp[0]);
                  std::string text = stream.str();
                  context->diagnostics->report(pp::Diagnostics::PP_DIVISION_BY_ZERO,
                                               context->token->location,
                                               text.c_str());
                  *(context->valid) = false;
              }
              (yyval) = static_cast<YYSTYPE>(0);
          }
          else if (((yyvsp[-2]) == std::numeric_limits<YYSTYPE>::min()) && ((yyvsp[0]) == -1))
          {
              // Check for the special case where the minimum representable number is
              // divided by -1. If left alone this has undefined results.
              (yyval) = 0;
          }
          else
          {
              (yyval) = (yyvsp[-2]) % (yyvsp[0]);
          }
      }
  
      break;
  
    case 23:
  
      {
          if ((yyvsp[0]) == 0)
          {
              if (!context->isIgnoringErrors())
              {
                  std::ostringstream stream;
                  stream << (yyvsp[-2]) << " / " << (yyvsp[0]);
                  std::string text = stream.str();
                  context->diagnostics->report(pp::Diagnostics::PP_DIVISION_BY_ZERO,
                                              context->token->location,
                                              text.c_str());
                  *(context->valid) = false;
              }
              (yyval) = static_cast<YYSTYPE>(0);
          }
          else if (((yyvsp[-2]) == std::numeric_limits<YYSTYPE>::min()) && ((yyvsp[0]) == -1))
          {
              // Check for the special case where the minimum representable number is
              // divided by -1. If left alone this leads to integer overflow in C++, which
              // has undefined results.
              (yyval) = std::numeric_limits<YYSTYPE>::max();
          }
          else
          {
              (yyval) = (yyvsp[-2]) / (yyvsp[0]);
          }
      }
  
      break;
  
    case 24:
  
      {
          (yyval) = gl::WrappingMul((yyvsp[-2]), (yyvsp[0]));
      }
  
      break;
  
    case 25:
  
      {
          (yyval) = ! (yyvsp[0]);
      }
  
      break;
  
    case 26:
  
      {
          (yyval) = ~ (yyvsp[0]);
      }
  
      break;
  
    case 27:
  
      {
          // Check for negation of minimum representable integer to prevent undefined signed int
          // overflow.
          if ((yyvsp[0]) == std::numeric_limits<YYSTYPE>::min())
          {
              (yyval) = std::numeric_limits<YYSTYPE>::min();
          }
          else
          {
              (yyval) = -(yyvsp[0]);
          }
      }
  
      break;
  
    case 28:
  
      {
          (yyval) = + (yyvsp[0]);
      }
  
      break;
  
    case 29:
  
      {
          (yyval) = (yyvsp[-1]);
      }
  
      break;
  
  
  
        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;
  
    /* 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 (context, YY_("syntax error"));
  #else
  # define YYSYNTAX_ERROR yysyntax_error (&yymsg_alloc, &yymsg, \
                                          yyssp, yytoken)
        {
          char const *yymsgp = YY_("syntax error");
          int yysyntax_error_status;
          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 (context, yymsgp);
          if (yysyntax_error_status == 2)
            goto yyexhaustedlab;
        }
  # undef YYSYNTAX_ERROR
  #endif
      }
  
  
  
    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, context);
            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;
  
    /* Do not reclaim the symbols of the rule whose 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;
  
  
        yydestruct ("Error: popping",
                    yystos[yystate], yyvsp, context);
        YYPOPSTACK (1);
        yystate = *yyssp;
        YY_STACK_PRINT (yyss, yyssp);
      }
  
    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
    *++yyvsp = yylval;
    YY_IGNORE_MAYBE_UNINITIALIZED_END
  
  
    /* 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 !defined yyoverflow || YYERROR_VERBOSE
  /*-------------------------------------------------.
  | yyexhaustedlab -- memory exhaustion comes here.  |
  `-------------------------------------------------*/
  yyexhaustedlab:
    yyerror (context, 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, context);
      }
    /* Do not reclaim the symbols of the rule whose action triggered
       this YYABORT or YYACCEPT.  */
    YYPOPSTACK (yylen);
    YY_STACK_PRINT (yyss, yyssp);
    while (yyssp != yyss)
      {
        yydestruct ("Cleanup: popping",
                    yystos[*yyssp], yyvsp, context);
        YYPOPSTACK (1);
      }
  #ifndef yyoverflow
    if (yyss != yyssa)
      YYSTACK_FREE (yyss);
  #endif
  #if YYERROR_VERBOSE
    if (yymsg != yymsgbuf)
      YYSTACK_FREE (yymsg);
  #endif
    return yyresult;
  }
  
  
  
  int yylex(YYSTYPE *lvalp, Context *context)
  {
      pp::Token *token = context->token;
      if (!context->parsePresetToken)
      {
          context->lexer->lex(token);
      }
      context->parsePresetToken = false;
  
      int type = 0;
  
      switch (token->type)
      {
        case pp::Token::CONST_INT: {
          unsigned int val = 0;
          int testVal = 0;
          if (!token->uValue(&val) || (!token->iValue(&testVal) &&
                                       context->errorSettings.integerLiteralsMustFit32BitSignedRange))
          {
              context->diagnostics->report(pp::Diagnostics::PP_INTEGER_OVERFLOW,
                                           token->location, token->text);
              *(context->valid) = false;
          }
          *lvalp = static_cast<YYSTYPE>(val);
          type = TOK_CONST_INT;
          break;
        }
        case pp::Token::IDENTIFIER:
          *lvalp = static_cast<YYSTYPE>(-1);
          type = TOK_IDENTIFIER;
          break;
        case pp::Token::OP_OR:
          type = TOK_OP_OR;
          break;
        case pp::Token::OP_AND:
          type = TOK_OP_AND;
          break;
        case pp::Token::OP_NE:
          type = TOK_OP_NE;
          break;
        case pp::Token::OP_EQ:
          type = TOK_OP_EQ;
          break;
        case pp::Token::OP_GE:
          type = TOK_OP_GE;
          break;
        case pp::Token::OP_LE:
          type = TOK_OP_LE;
          break;
        case pp::Token::OP_RIGHT:
          type = TOK_OP_RIGHT;
          break;
        case pp::Token::OP_LEFT:
          type = TOK_OP_LEFT;
          break;
        case '|':
        case '^':
        case '&':
        case '>':
        case '<':
        case '-':
        case '+':
        case '%':
        case '/':
        case '*':
        case '!':
        case '~':
        case '(':
        case ')':
          type = token->type;
          break;
  
        default:
          break;
      }
  
      return type;
  }
  
  void yyerror(Context *context, const char *reason)
  {
      context->diagnostics->report(pp::Diagnostics::PP_INVALID_EXPRESSION,
                                   context->token->location,
                                   reason);
  }
  
  namespace pp {
  
  ExpressionParser::ExpressionParser(Lexer *lexer, Diagnostics *diagnostics)
      : mLexer(lexer),
        mDiagnostics(diagnostics)
  {
  }
  
  bool ExpressionParser::parse(Token *token,
                               int *result,
                               bool parsePresetToken,
                               const ErrorSettings &errorSettings,
                               bool *valid)
  {
      Context context;
      context.diagnostics = mDiagnostics;
      context.lexer = mLexer;
      context.token = token;
      context.result = result;
      context.ignoreErrors = 0;
      context.parsePresetToken = parsePresetToken;
      context.errorSettings    = errorSettings;
      context.valid            = valid;
      int ret = yyparse(&context);
      switch (ret)
      {
        case 0:
        case 1:
          break;
  
        case 2:
          mDiagnostics->report(Diagnostics::PP_OUT_OF_MEMORY, token->location, "");
          break;
  
        default:
          assert(false);
          mDiagnostics->report(Diagnostics::PP_INTERNAL_ERROR, token->location, "");
          break;
      }
  
      return ret == 0;
  }
  
  }  // namespace pp
  

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