Saturday 30 December 2006
- A conceptual framework for classifying debuggers and execution recorders.
- Treating instruction execution and memory writes as two instances of a common concept --- "memory effects" --- and providing a single implementation and API for recording, indexing, compressing, storing and querying them.
- The "bunching" optimization for memory effects.
- The principle that repetitious program behaviour should produce repetitious input to the compressor in order to maximise the benefits of compression, and how to tweak the formatting of trace data to follow that principle.
The document also contains screenshots of the prototype XULRunner-based debugger based on Amber, to motivate Amber's design by illustrating what is possible when you go beyond just reverse execution. I assure you that those screenshots are not faked in any way; it really works :-).