[Numpy-discussion] C code coverage tool

Michael Droettboom mdroe@stsci....
Tue Oct 27 06:33:54 CDT 2009

On 10/27/2009 05:11 AM, Pauli Virtanen wrote:
> Mon, 26 Oct 2009 14:26:20 -0400, Michael Droettboom wrote:
>> I know David Cournapeau has done some work on using gcov for coverage
>> with Numpy.
>> Unaware of this, (doh! -- I should have Googled first), I wrote a small
>> C code-coverage tool built on top of valgrind's callgrind tool, so it
>> basically only works on x86/AMD64 unixy platforms, but unlike gcov it
>> doesn't require any recompilation headaches (though compiling
>> unoptimized helps).
> [clip]
> Where's the code?
It's in the Numpy SVN tree now, under tools/c_coverage
> [clip]
>> Is this something we want to add to the SVN tree, maybe under tools?
> Yes. Also, maybe you want to send it to the Valgrind guys, too. If they
> don't yet have a code coverage functionality yet, it could be nice to
> have.
There has been a coverage-only valgrind tool in the works for almost two 
years (vcov).  That's a lot more work that what I've done here (by 
reusing callgrind for the purpose), but it will apparently be more 
performant.  Personally, I couldn't get it to compile (I think it's out 
of sync with the rest of valgrind atm).

I didn't want to wait for that, and I don't know enough about valgrind 
internals to effectively contribute, so I just wrote a callgrind parser 
(really not that hard).  I found another project [1] that takes a 
similar approach, but it's written in C++ and looked too difficult to 
adapt to handle Numpy's code generation.

[1] http://github.com/icefox/callgrind_tools


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