Function drmgr_is_first_nonlabel_instr 

pub unsafe extern "C" fn drmgr_is_first_nonlabel_instr(
    drcontext: *mut c_void,
    instr: *mut instr_t,
) -> bool_

Must be called during drmgr’s insertion phase. Returns whether \p instr is the first non-label instruction in the instruction list (as of immediately after the analysis phase).