In reality this will be core.sys.darwin.mach.loader.segment_command on 32-bit platforms and core.sys.darwin.mach.loader.segment_command_64 64-bit platforms.
See Implementation
In reality this will be core.sys.darwin.mach.loader.segment_command on 32-bit platforms and core.sys.darwin.mach.loader.segment_command_64 64-bit platforms.