The question isn't very clear. By definition, harmonics only exist for AC systems, so I presume you are asking for harmonics on the AC input? AC power supply is a low impedance voltage source in a first order, thus we are looking at harmonic currents.
The current waveform and respective harmonic content strongly depends on the AC/DC converter (e.g. rectifier) circuit and its parameters and to a certain degree also on the mains impedance.
If you are asking about specific converter/rectifier circuits, you should specify it.