Hello, On Tue, Apr 1, 2008 at 9:02 PM, m h wrote: > Howdy Folks- > > I hope this is not too off topic. Sadly the current sys.settrace only > allows tracing at the line level. This isn't sufficient to do branch > and path coverage. The main problem is that many boolean operations > can appear on a single line, and so you can't be sure which > conditional branch was taken using the current tracing method. > > After speaking about code complexity/testing at Pycon [0], with a few > people there, and seeing a few people have made some strides or shown > interested in metrics/code graphs/flow and branch coverage I think > that there is interest in this. > > One proposed method of getting branch coverage was to use Dalke's > Python4Ply [1] to translate code so that all branches occur on their > own line. Then using line coverage on that and converting it back to > branch coverage of the original code. > > The maintainer of coverage.py suggested that we look into patching > python instead to trace at a more granular level. His feeling was > that there would be too many corner cases and the translation would > get hairy quite quickly. > > Sadly in my 8 years of python experience I've yet to touch any c based > guts of python. I'm looking for advice on how to get finer grain > tracing with sys.settrace. > > Any advice or suggestions? There is a quorum of people (at least 5 > others) who would be very interested in this functionality because it > could lead to some cool tools built on top of it. (With the end goal > that python code be cleaner, simpler and better tested).
You can start by looking at the file Python/ceval.c, which contains the interpreter loop. More precisely, the function maybe_call_line_trace() is responsible to call sys.settrace. I think you will have to change the logic there. -- Amaury Forgeot d'Arc _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
