Hey siddivi.
Please show us your working. You need to come up with a function that defines the cross sectional length from the middle of the glass first.
Try doing that and then use the formulas for volume integration by shells or discs.
That depends on the wine glass.
You can either measure it directly at different intervals or you can make an assumption that its parabolic or something else.
The thing though is that "curved" is pretty ambiguous.
Either way you are going to have get the information by assumption or by measurement.
You should start by stating the formula used.
You will then have to define the function of rotation and the axis you want to rotate around with the limits of integration.
See if you can post these bits of information in this thread and we can guide you as necessary.