[alehander42]

We are currently working on two "backends" where recording works in different ways.

For the scripting languages and smart contract/ZK languages, we instrument the interpreters using high level hooking API-s or direct patches, and we produce a trace.

For system languages, we directly build on top of RR[1] recordings for now: RR can record multiple processes, and it works in userland. IIRC it doesn't support modifications of shared memory outside of the recording. It's very well documented in their paper: Engineering Record And Replay For Deployability: Extended Technical Report[2].

1: https://rr-project.org/

2: https://arxiv.org/abs/1705.05937