Where can I find gdsio.cu file in CUDA toolkit or any other src location?

I am trying to compile gdsio as per my GPU Simulator environment, and I am not able to find gdsio.cu file in CUDA toolkit which I can compile as per my requirement.
Kindly share some details about it.

are you referring to this tool?

I don’t believe the source code for it is provided. You could confirm that by installing GDS and then doing a search of the files installed.

I installed GDS but can’t find gdsio.cu in it.