How to check if a class has metaclass definition in mach-o file

So, I'm examining the mach-o.

Now I was able to explain how to map a pointer to a class structure, but I found that if I use otool, sometimes it will print something has a metaclass:

00000001000990d8 0x1000b75c8
           isa 0x1000b75f0
    superclass 0x0
         cache 0x0
        vtable 0x0
          data 0x1000a5a00 (struct class_ro_t *)
                    flags 0x184 RO_HAS_CXX_STRUCTORS
            instanceStart 8
             instanceSize 152
                 reserved 0x0
               ivarLayout 0x10007bb99
                layout map: 0x1f 0x02 
                     name 0x10007bb93 AASDK

      

        
        
        
      

    

and after that class_ro_t * there is one section right after it:

Meta Class
           isa 0x0
    superclass 0x0
         cache 0x0
        vtable 0x0
          data 0x1000a5730 (struct class_ro_t *)
                    flags 0x185 RO_META RO_HAS_CXX_STRUCTORS
            instanceStart 40
             instanceSize 40
                 reserved 0x0
               ivarLayout 0x0
                     name 0x10007bb93 AASDK
              baseMethods 0x1000a5698 (struct method_list_t *)

      

        
        
        
      

    

And it looks like the meta-class has methods declared as class methods (marked +

in ObjC code)

The memory layout looks like this:

1000B75C8: F0 75 0B 00 01 00 00 00  00 00 00 00 00 00 00 00 
1000B75D8: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
1000B75E8: 00 5A 0A 00 01 00 00 00  00 00 00 00 00 00 00 00 
1000B75F8: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
1000B7608: 00 00 00 00 00 00 00 00  30 57 0A 00 01 00 00 00 
1000B7618: 40 76 0B 00 01 00 00 00  00 00 00 00 00 00 00 00 

      

        
        
        
      

    

Obviously we can see what 30 57 0A 00 01 00 00 00

is the metaclass data pointer.

I wonder how to find out if a class has meta information?

I have checked the source code of otool but I cannot read it, it has a lot of computation and offsets. Can anyone help explain how to test it?