#ifndef __OS_BASE__
#define __OS_BASE__
#include <sys/cdefs.h>
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif
#ifndef __has_include
#define __has_include(x) 0
#endif
#ifndef __has_feature
#define __has_feature(x) 0
#endif
#ifndef __has_attribute
#define __has_attribute(x) 0
#endif
#ifndef __has_extension
#define __has_extension(x) 0
#endif
#undef OS_INLINE // <sys/_types/_os_inline.h>
#if __GNUC__
#define OS_NORETURN __attribute__((__noreturn__))
#define OS_NOTHROW __attribute__((__nothrow__))
#define OS_NONNULL1 __attribute__((__nonnull__(1)))
#define OS_NONNULL2 __attribute__((__nonnull__(2)))
#define OS_NONNULL3 __attribute__((__nonnull__(3)))
#define OS_NONNULL4 __attribute__((__nonnull__(4)))
#define OS_NONNULL5 __attribute__((__nonnull__(5)))
#define OS_NONNULL6 __attribute__((__nonnull__(6)))
#define OS_NONNULL7 __attribute__((__nonnull__(7)))
#define OS_NONNULL8 __attribute__((__nonnull__(8)))
#define OS_NONNULL9 __attribute__((__nonnull__(9)))
#define OS_NONNULL10 __attribute__((__nonnull__(10)))
#define OS_NONNULL11 __attribute__((__nonnull__(11)))
#define OS_NONNULL12 __attribute__((__nonnull__(12)))
#define OS_NONNULL13 __attribute__((__nonnull__(13)))
#define OS_NONNULL14 __attribute__((__nonnull__(14)))
#define OS_NONNULL15 __attribute__((__nonnull__(15)))
#define OS_NONNULL_ALL __attribute__((__nonnull__))
#define OS_SENTINEL __attribute__((__sentinel__))
#define OS_PURE __attribute__((__pure__))
#define OS_CONST __attribute__((__const__))
#define OS_WARN_RESULT __attribute__((__warn_unused_result__))
#define OS_MALLOC __attribute__((__malloc__))
#define OS_USED __attribute__((__used__))
#define OS_UNUSED __attribute__((__unused__))
#define OS_COLD __attribute__((__cold__))
#define OS_WEAK __attribute__((__weak__))
#define OS_WEAK_IMPORT __attribute__((__weak_import__))
#define OS_NOINLINE __attribute__((__noinline__))
#define OS_ALWAYS_INLINE __attribute__((__always_inline__))
#define OS_TRANSPARENT_UNION __attribute__((__transparent_union__))
#define OS_ALIGNED(n) __attribute__((__aligned__((n))))
#define OS_FORMAT_PRINTF(x,y) __attribute__((__format__(printf,x,y)))
#define OS_EXPORT extern __attribute__((__visibility__("default")))
#define OS_INLINE static __inline__
#define OS_EXPECT(x, v) __builtin_expect((x), (v))
#else
#define OS_NORETURN
#define OS_NOTHROW
#define OS_NONNULL1
#define OS_NONNULL2
#define OS_NONNULL3
#define OS_NONNULL4
#define OS_NONNULL5
#define OS_NONNULL6
#define OS_NONNULL7
#define OS_NONNULL8
#define OS_NONNULL9
#define OS_NONNULL10
#define OS_NONNULL11
#define OS_NONNULL12
#define OS_NONNULL13
#define OS_NONNULL14
#define OS_NONNULL15
#define OS_NONNULL_ALL
#define OS_SENTINEL
#define OS_PURE
#define OS_CONST
#define OS_WARN_RESULT
#define OS_MALLOC
#define OS_USED
#define OS_UNUSED
#define OS_COLD
#define OS_WEAK
#define OS_WEAK_IMPORT
#define OS_NOINLINE
#define OS_ALWAYS_INLINE
#define OS_TRANSPARENT_UNION
#define OS_ALIGNED(n)
#define OS_FORMAT_PRINTF(x,y)
#define OS_EXPORT extern
#define OS_INLINE static inline
#define OS_EXPECT(x, v) (x)
#endif
#if __has_attribute(noescape)
#define OS_NOESCAPE __attribute__((__noescape__))
#else
#define OS_NOESCAPE
#endif
#if __has_feature(assume_nonnull)
#define OS_ASSUME_NONNULL_BEGIN _Pragma("clang assume_nonnull begin")
#define OS_ASSUME_NONNULL_END _Pragma("clang assume_nonnull end")
#else
#define OS_ASSUME_NONNULL_BEGIN
#define OS_ASSUME_NONNULL_END
#endif
#if __has_builtin(__builtin_assume)
#define OS_COMPILER_CAN_ASSUME(expr) __builtin_assume(expr)
#else
#define OS_COMPILER_CAN_ASSUME(expr) ((void)(expr))
#endif
#if __has_extension(attribute_overloadable)
#define OS_OVERLOADABLE __attribute__((__overloadable__))
#else
#define OS_OVERLOADABLE
#endif
#if __has_feature(objc_fixed_enum) || __has_extension(cxx_strong_enums)
#define OS_ENUM(_name, _type, ...) \
typedef enum : _type { __VA_ARGS__ } _name##_t
#else
#define OS_ENUM(_name, _type, ...) \
enum { __VA_ARGS__ }; typedef _type _name##_t
#endif
#if __has_feature(attribute_availability_swift)
#define OS_SWIFT_UNAVAILABLE(_msg) \
__attribute__((__availability__(swift, unavailable, message=_msg)))
#else
#define OS_SWIFT_UNAVAILABLE(_msg)
#endif
#if __has_attribute(swift_private)
# define OS_REFINED_FOR_SWIFT __attribute__((__swift_private__))
#else
# define OS_REFINED_FOR_SWIFT
#endif
#if __has_attribute(swift_name)
# define OS_SWIFT_NAME(_name) __attribute__((__swift_name__(#_name)))
#else
# define OS_SWIFT_NAME(_name)
#endif
#define __OS_STRINGIFY(s) #s
#define OS_STRINGIFY(s) __OS_STRINGIFY(s)
#define __OS_CONCAT(x, y) x ## y
#define OS_CONCAT(x, y) __OS_CONCAT(x, y)
#ifdef __GNUC__
#define os_prevent_tail_call_optimization() __asm__("")
#define os_is_compile_time_constant(expr) __builtin_constant_p(expr)
#define os_compiler_barrier() __asm__ __volatile__("" ::: "memory")
#else
#define os_prevent_tail_call_optimization() do { } while (0)
#define os_is_compile_time_constant(expr) 0
#define os_compiler_barrier() do { } while (0)
#endif
#if __has_attribute(not_tail_called)
#define OS_NOT_TAIL_CALLED __attribute__((__not_tail_called__))
#else
#define OS_NOT_TAIL_CALLED
#endif
typedef void (*os_function_t)(void *_Nullable);
#ifdef __BLOCKS__
typedef void (^os_block_t)(void);
#endif
#endif // __OS_BASE__