Does Jackie Chan really do all of his own stunts?

Is there a line drawn by executives or the director where he can't do certain stunts for the sake of the production?  What is it like watching Chan block and perform the stunts?
Yes. It’s an incredible thing to watch. He popped his ankle out one day while jumping onto a boat in a scene forShanghai Knights. He designs and choreographs his action scenes the way Gene Kelly or Fred Astaire would choreograph a dance sequence. The Ideas flow out of him in real time, and we actually had to chase him around with a film crew to adapt to what he was thinking up.
 
One of the things that was really amazing was watching him use sleight of hand. He understands what the camera sees, what the camera doesn’t see, and understands how it’s going to be entertaining for an audience to watch him do what he does. He’s a bit of a magician…as well as a stuntman.