Airbus aircraft do not use stall vanes for stall warning. Airbus use a sophisticated system of stall prevention instead, with the angle of attack and slat settings are primary parameters in the fly-by-wire computer system.
The angle of attack is determined by two electrically heated alpha probes on either side of the forward fuselage.
As the aircraft approaches a stall condition, (in normal law) the flight computers take control and return controls to a non-stall position.