rr has an "extended technical report" at https://arxiv.org/pdf/1705.05937.pdf https://arxiv.org/pdf/1705.05937.pdf which explains the principles it uses. In gen

rr has an "extended technical report" at https://arxiv.org/pdf/1705.05937.pdf https://arxiv.org/pdf/1705.05937.pdf which explains the principles it uses. In general they are inherently rather complicated -- in order to get to anything resembling useful speed of execution, you need to play clever tricks of one kind or another to avoid having to record absolutely everything about the process under debug.