lj_ccallback_ptr2slot  437 lib_ffi.c          MSize slot = lj_ccallback_ptr2slot(cts, *(void **)cdataptr(cd));
lj_ccallback_ptr2slot   17 lj_ccallback.h LJ_FUNC MSize lj_ccallback_ptr2slot(CTState *cts, void *p);