database.py 文件源码

def prev(cls, ea, count):
        ea = interface.address.within(ea)
        isStop = lambda ea: _instruction.feature(ea) & idaapi.CF_STOP == idaapi.CF_STOP
        invalidQ = utils.compose(utils.fap(utils.compose(type.is_code, operator.not_), isStop), any)
        refs = filter(type.is_code, xref.up(ea))
        if len(refs) > 1 and invalidQ(address.prev(ea)):
            logging.fatal("{:s}.prev({:x}, count={:d}) : Unable to determine previous address due to multiple previous references being available : {:s}".format('.'.join((__name__, cls.__name__)), ea, count, ', '.join(__builtin__.map("{:x}".format,refs))))
            return None
        try:
            if invalidQ(address.prev(ea)):
                res = refs[0]
                count += 1
            else:
                res = address.prev(ea)
        except:
            res = ea
        return cls.prev(res, count-1) if count > 1 else res