507   struct MachOSegmentCommand {  struct in v8::internal::GDBJITInterface::BASE_EMBEDDED
508     uint32_t cmd;
509     uint32_t cmdsize;
510     char segname[16];
512     uint32_t vmaddr;
513     uint32_t vmsize;
514     uint32_t fileoff;
515     uint32_t filesize;
517     uint64_t vmaddr;
518     uint64_t vmsize;
519     uint64_t fileoff;
520     uint64_t filesize;
522     uint32_t maxprot;
523     uint32_t initprot;
524     uint32_t nsects;
525     uint32_t flags;