let get_concrete_value_of_return (f:string) =
let kf = Globals.Functions.find_by_name f in
let rstmt = Kernel_function.find_return kf in
match rstmt.skind with
| Return (Some (e),_) -> e.enode
| _ -> Aorai_option.fatal "The stmt %d have to be a return of the function %s, but it is not a well formed stmt." rstmt.sid f