Sobhan, if you're doing an in-place upgrade up to AEM then the assets will be "moved" as part of the migration process (which is well documented). There is no automatic conversion from one type to another though. ie: Your XDP's won't become Adaptive Forms.
Are you using Workspace (/lc/ws) or task assignments? If not, then an in place upgrade won't be necessary - performa new installation and bring your assets over by using the standard LCA process.