GCC主要数据结构之rid

/* Usage of TREE_LANG_FLAG_?:
   0: IDENTIFIER_MARKED (used by search routines).
      C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
   1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
      STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
      C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
   2: unused
   3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
   4: unused
*/
/* Reserved identifiers.  This is the union of all the keywords for C,
   C++, and Objective-C.  All the type modifiers have to be in one
   block at the beginning, because they are used as mask bits.  There
   are 28 type modifiers; if we add many more we will have to redesign
   the mask mechanism.  */
enum rid
{
  /* Modifiers: */
  /* C, in empirical order of frequency.  */
  RID_STATIC = 0,
  RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  RID_NORETURN, RID_ATOMIC,
  /* C extensions */
  RID_COMPLEX, RID_THREAD, RID_SAT,
  /* C++ */
  RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  /* ObjC ("PQ" reserved words - they do not appear after a '@' and
     are keywords only in specific contexts)  */
  RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  /* ObjC ("PATTR" reserved words - they do not appear after a '@' 
     and are keywords only as property attributes)  */
  RID_GETTER, RID_SETTER,
  RID_READONLY, RID_READWRITE,
  RID_ASSIGN, RID_RETAIN, RID_COPY,
  RID_NONATOMIC,
  /* C (reserved and imaginary types not implemented, so any use is a
     syntax error) */
  RID_IMAGINARY,
  /* C */
  RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  RID_SIZEOF,
  /* C extensions */
  RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
  RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,      RID_BUILTIN_SHUFFLE,
  RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
  RID_FRACT, RID_ACCUM, RID_AUTO_TYPE, RID_BUILTIN_CALL_WITH_STATIC_CHAIN,
  /* C11 */
  RID_ALIGNAS, RID_GENERIC,
  /* This means to warn that this is a C++ keyword, and then treat it
     as a normal identifier.  */
  RID_CXX_COMPAT_WARN,
  /* GNU transactional memory extension */
  RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
  /* Too many ways of getting the name of a function as a string */
  RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  /* C++ (some of these are keywords in Objective-C as well, but only
     if they appear after a '@') */
  RID_BOOL,     RID_WCHAR,    RID_CLASS,
  RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  RID_TEMPLATE, RID_NULL,     RID_CATCH,
  RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  RID_THIS,     RID_THROW,    RID_TRUE,
  RID_TRY,      RID_TYPENAME, RID_TYPEID,
  RID_USING,    RID_CHAR16,   RID_CHAR32,
  /* casts */
  RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  /* C++ extensions */
  RID_BASES,                   RID_DIRECT_BASES,
  RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
  RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
  RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
  RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
  RID_IS_ABSTRACT,             RID_IS_BASE_OF,
  RID_IS_CLASS,
  RID_IS_EMPTY,                RID_IS_ENUM,
  RID_IS_FINAL,                RID_IS_LITERAL_TYPE,
  RID_IS_POD,                  RID_IS_POLYMORPHIC,
  RID_IS_SAME_AS,
  RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
  RID_IS_TRIVIALLY_ASSIGNABLE, RID_IS_TRIVIALLY_CONSTRUCTIBLE,
  RID_IS_TRIVIALLY_COPYABLE,
  RID_IS_UNION,                RID_UNDERLYING_TYPE,
  /* C++11 */
  RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
  /* C++ concepts */
  RID_CONCEPT, RID_REQUIRES,
  /* C++ transactional memory.  */
  RID_ATOMIC_NOEXCEPT, RID_ATOMIC_CANCEL, RID_SYNCHRONIZED,
  /* Cilk Plus keywords.  */
  RID_CILK_SPAWN, RID_CILK_SYNC, RID_CILK_FOR,
  
  /* Objective-C ("AT" reserved words - they are only keywords when
     they follow '@')  */
  RID_AT_ENCODE,   RID_AT_END,
  RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
  RID_AT_PROTOCOL, RID_AT_SELECTOR,
  RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
  RID_AT_FINALLY,  RID_AT_SYNCHRONIZED, 
  RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
  RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
  RID_AT_INTERFACE,
  RID_AT_IMPLEMENTATION,
  /* Named address support, mapping the keyword to a particular named address
     number.  Named address space 0 is reserved for the generic address.  If
     there are more than 254 named addresses, the addr_space_t type will need
     to be grown from an unsigned char to unsigned short.  */
  RID_ADDR_SPACE_0,  /* generic address */
  RID_ADDR_SPACE_1,
  RID_ADDR_SPACE_2,
  RID_ADDR_SPACE_3,
  RID_ADDR_SPACE_4,
  RID_ADDR_SPACE_5,
  RID_ADDR_SPACE_6,
  RID_ADDR_SPACE_7,
  RID_ADDR_SPACE_8,
  RID_ADDR_SPACE_9,
  RID_ADDR_SPACE_10,
  RID_ADDR_SPACE_11,
  RID_ADDR_SPACE_12,
  RID_ADDR_SPACE_13,
  RID_ADDR_SPACE_14,
  RID_ADDR_SPACE_15,
  RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
  RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
  /* __intN keywords.  The _N_M here doesn't correspond to the intN
     in the keyword; use the bitsize in int_n_t_data_t[M] for that.
     For example, if int_n_t_data_t[0].bitsize is 13, then RID_INT_N_0
     is for __int13.  */
  /* Note that the range to use is RID_FIRST_INT_N through
     RID_FIRST_INT_N + NUM_INT_N_ENTS - 1 and c-parser.c has a list of
     all RID_INT_N_* in a case statement.  */
  RID_INT_N_0,
  RID_INT_N_1,
  RID_INT_N_2,
  RID_INT_N_3,
  RID_FIRST_INT_N = RID_INT_N_0,
  RID_LAST_INT_N = RID_INT_N_3,
  RID_MAX,
  RID_FIRST_MODIFIER = RID_STATIC,
  RID_LAST_MODIFIER = RID_ONEWAY,
  RID_FIRST_CXX11 = RID_CONSTEXPR,
  RID_LAST_CXX11 = RID_STATIC_ASSERT,
  RID_FIRST_AT = RID_AT_ENCODE,
  RID_LAST_AT = RID_AT_IMPLEMENTATION,
  RID_FIRST_PQ = RID_IN,
  RID_LAST_PQ = RID_ONEWAY,
  RID_FIRST_PATTR = RID_GETTER,
  RID_LAST_PATTR = RID_NONATOMIC
};