[pypy-dev] Dependence Graphs in Pypy?

Alex Gaynor alex.gaynor at gmail.com
Wed Aug 8 20:14:36 CEST 2012

On Wed, Aug 8, 2012 at 11:12 AM, Tim Henderson <tim.tadh at gmail.com> wrote:

> Hi Pypy devs!
> I am a graduate student working on mining software repositories,
> specifically mining programming patterns (or rules) from code bases.[1] I
> would like to do some work mining patterns from Python programs and I could
> jump start that work if I could generate dependence graphs from python
> source files (or from the bytecode).
> So I was wondering if Pypy does this already. Actually it would be a big
> help even if pypy only generated a control flow graph. From my quick skim
> of some of the source code it seems like it does this for RPython but I
> wasn't sure about regular python. If I could get a CFG I could then
> annotate it with the data dependence edges.
> Any pointers to where I should look in the Pypy code would be appreciated!
> Additionally, if you feel having python pDG's would be helpful in Pypy's
> interpreter perhaps any work I do towards that end could be a starting
> point.
> Thanks for the excellent work on Pypy!
> [1] Here is some of my research group's previous work on pattern
> extraction http://doi.wiley.com/10.1002/smr.532 (if you can't get the
> paper and would like it let me know)
> Cheers
> ---
> Tim Henderson
> mail me: tim.tadh at gmail.com
> mail me: timothy.henderson at case.edu
> github: github.com/timtadh
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You're correct, we only generate full CFGs for RPython.  The Python
bytecode compiler for PyPy (and CPython) does have a CFG, but they're just
local to functions so I don't think they're what you're looking for.


"I disapprove of what you say, but I will defend to the death your right to
say it." -- Evelyn Beatrice Hall (summarizing Voltaire)
"The people's good is the highest law." -- Cicero
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