We address issue 1 (locating earlier points) by … We address issue 2 (overhead of re-execution) by … counters, and we address it by using periodic … [p. 300] we insert calls to the step counter … each line starting a new statement … We also insert at each function entry and … [p. 301] For typical programs running on a 600 … a factor of 2. … We use 64-bit counters
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