runtime —— message.h

/// Specifies the superclass of an instance. 
struct objc_super {

    __unsafe_unretained _Nonnull id receiver;

    __unsafe_unretained _Nonnull Class class;

    __unsafe_unretained _Nonnull Class super_class;

};

#if !OBJC_OLD_DISPATCH_PROTOTYPES
OBJC_EXPORT void
objc_msgSend(void /* id self, SEL op, ... */ )
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);


OBJC_EXPORT void
objc_msgSendSuper(void /* struct objc_super *super, SEL op, ... */ )
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);


OBJC_EXPORT id _Nullable
objc_msgSend(id _Nullable self, SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);


OBJC_EXPORT id _Nullable
objc_msgSendSuper(struct objc_super * _Nonnull super, SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

#if !OBJC_OLD_DISPATCH_PROTOTYPES
OBJC_EXPORT void
objc_msgSend_stret(void /* id self, SEL op, ... */ )
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;


OBJC_EXPORT void
objc_msgSendSuper_stret(void /* struct objc_super *super, SEL op, ... */ )
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;
#else


OBJC_EXPORT void
objc_msgSend_stret(id _Nullable self, SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;



OBJC_EXPORT void
objc_msgSendSuper_stret(struct objc_super * _Nonnull super,
                        SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;


# if defined(__i386__)

OBJC_EXPORT void
objc_msgSend_fpret(void /* id self, SEL op, ... */ )
    OBJC_AVAILABLE(10.4, 2.0, 9.0, 1.0, 2.0);

# elif defined(__x86_64__)


OBJC_EXPORT void
objc_msgSend_fpret(void /* id self, SEL op, ... */ )
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

OBJC_EXPORT void
objc_msgSend_fp2ret(void /* id self, SEL op, ... */ )
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);


OBJC_EXPORT double
objc_msgSend_fpret(id _Nullable self, SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.4, 2.0, 9.0, 1.0, 2.0);

OBJC_EXPORT long double
objc_msgSend_fpret(id _Nullable self, SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

#  if __STDC_VERSION__ >= 199901L
OBJC_EXPORT _Complex long double
objc_msgSend_fp2ret(id _Nullable self, SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
#  else
OBJC_EXPORT void objc_msgSend_fp2ret(id _Nullable self, SEL _Nonnull op, ...)
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);
#  endif


#if !OBJC_OLD_DISPATCH_PROTOTYPES
OBJC_EXPORT void
method_invoke(void /* id receiver, Method m, ... */ ) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

OBJC_EXPORT void
method_invoke_stret(void /* id receiver, Method m, ... */ ) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;
#else
OBJC_EXPORT id _Nullable
method_invoke(id _Nullable receiver, Method _Nonnull m, ...) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0);

OBJC_EXPORT void
method_invoke_stret(id _Nullable receiver, Method _Nonnull m, ...) 
    OBJC_AVAILABLE(10.5, 2.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;
#endif



#if !OBJC_OLD_DISPATCH_PROTOTYPES
OBJC_EXPORT void
_objc_msgForward(void /* id receiver, SEL sel, ... */ ) 
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

OBJC_EXPORT void
_objc_msgForward_stret(void /* id receiver, SEL sel, ... */ ) 
    OBJC_AVAILABLE(10.6, 3.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;
#else
OBJC_EXPORT id _Nullable
_objc_msgForward(id _Nonnull receiver, SEL _Nonnull sel, ...) 
    OBJC_AVAILABLE(10.0, 2.0, 9.0, 1.0, 2.0);

OBJC_EXPORT void
_objc_msgForward_stret(id _Nonnull receiver, SEL _Nonnull sel, ...) 
    OBJC_AVAILABLE(10.6, 3.0, 9.0, 1.0, 2.0)
    OBJC_ARM64_UNAVAILABLE;

typedef void* marg_list;

OBJC_EXPORT id _Nullable
objc_msgSendv(id _Nullable self, SEL _Nonnull op, size_t arg_size,
              marg_list _Nonnull arg_frame)
    OBJC2_UNAVAILABLE;

OBJC_EXPORT void
objc_msgSendv_stret(void * _Nonnull stretAddr, id _Nullable self,
                    SEL _Nonnull op, size_t arg_size,
                    marg_list _Nullable arg_frame)
    OBJC2_UNAVAILABLE;
/* Note that objc_msgSendv_stret() does not return a structure type, 
 * and should not be cast to do so. This is unlike objc_msgSend_stret() 
 * and objc_msgSendSuper_stret().
 */
#if defined(__i386__)
OBJC_EXPORT double
objc_msgSendv_fpret(id _Nullable self, SEL _Nonnull op,
                    unsigned arg_size, marg_list _Nullable arg_frame)
    OBJC2_UNAVAILABLE;
#endif