Gen AI model with source code tracing capability

We are doing a project wherein there are N number java services which are not properly maintained, neither have any documentation. And hence we are trying to develop a tool with help of a gen AI model which can trace through java source code from 1st call to last call and then to DB or 3rd party call where it ends. Create flow chart, identify all dependencies and create mapping of services v/s dependencies. Is there any aws gen AI model available for this? any tools which can help? any ideas to make this possible?

Thanks.