GCC主要数据结构之c_tree_index

/* Standard named or nameless data types of the C compiler.  */
enum c_tree_index
{
    CTI_CHAR16_TYPE,
    CTI_CHAR32_TYPE,
    CTI_WCHAR_TYPE,
    CTI_UNDERLYING_WCHAR_TYPE,
    CTI_WINT_TYPE,
    CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
    CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
    CTI_INTMAX_TYPE,
    CTI_UINTMAX_TYPE,
    CTI_WIDEST_INT_LIT_TYPE,
    CTI_WIDEST_UINT_LIT_TYPE,
    /* Types for , that may not be defined on all
       targets.  */
    CTI_SIG_ATOMIC_TYPE,
    CTI_INT8_TYPE,
    CTI_INT16_TYPE,
    CTI_INT32_TYPE,
    CTI_INT64_TYPE,
    CTI_UINT8_TYPE,
    CTI_UINT16_TYPE,
    CTI_UINT32_TYPE,
    CTI_UINT64_TYPE,
    CTI_INT_LEAST8_TYPE,
    CTI_INT_LEAST16_TYPE,
    CTI_INT_LEAST32_TYPE,
    CTI_INT_LEAST64_TYPE,
    CTI_UINT_LEAST8_TYPE,
    CTI_UINT_LEAST16_TYPE,
    CTI_UINT_LEAST32_TYPE,
    CTI_UINT_LEAST64_TYPE,
    CTI_INT_FAST8_TYPE,
    CTI_INT_FAST16_TYPE,
    CTI_INT_FAST32_TYPE,
    CTI_INT_FAST64_TYPE,
    CTI_UINT_FAST8_TYPE,
    CTI_UINT_FAST16_TYPE,
    CTI_UINT_FAST32_TYPE,
    CTI_UINT_FAST64_TYPE,
    CTI_INTPTR_TYPE,
    CTI_UINTPTR_TYPE,
    CTI_CHAR_ARRAY_TYPE,
    CTI_CHAR16_ARRAY_TYPE,
    CTI_CHAR32_ARRAY_TYPE,
    CTI_WCHAR_ARRAY_TYPE,
    CTI_STRING_TYPE,
    CTI_CONST_STRING_TYPE,
    /* Type for boolean expressions (bool in C++, int in C).  */
    CTI_TRUTHVALUE_TYPE,
    CTI_TRUTHVALUE_TRUE,
    CTI_TRUTHVALUE_FALSE,
    CTI_DEFAULT_FUNCTION_TYPE,
    /* These are not types, but we have to look them up all the time.  */
    CTI_FUNCTION_NAME_DECL,
    CTI_PRETTY_FUNCTION_NAME_DECL,
    CTI_C99_FUNCTION_NAME_DECL,
    CTI_SAVED_FUNCTION_NAME_DECLS,
    CTI_NULL,
    CTI_MAX
};