[Cython] CyFunction refactoring plan

mark florisson markflorisson88 at gmail.com
Sun Oct 2 20:21:40 CEST 2011

On 2 October 2011 18:52, Vitja Makarov <vitja.makarov at gmail.com> wrote:
> 2011/9/30 mark florisson <markflorisson88 at gmail.com>:
>> On 30 September 2011 07:47, Vitja Makarov <vitja.makarov at gmail.com> wrote:
>>> 2011/9/30 Vitja Makarov <vitja.makarov at gmail.com>:
>>>> 2011/9/30 Robert Bradshaw <robertwb at math.washington.edu>:
>>>>> On Thu, Sep 29, 2011 at 10:43 PM, Stefan Behnel <stefan_ml at behnel.de> wrote:
>>>>>> Vitja Makarov, 30.09.2011 06:41:
>>>>>>> 2011/9/28 Vitja Makarov:
>>>>>>>> I tried to build simple plan for ongoing cython function refactoring
>>>>>>>> * Replace assignment synthesis with SingleAssignmentNode, where LHS is
>>>>>>>> NameNode and RHS is PyCFunctionNode
>>>>>>>> * Split function body into python wrapper and C function
>>>>>>>> http://wiki.cython.org/enhancements/generators#Pythonfunctionrefactoring
>>>>>>>> Then we can implement some features and optimizations:
>>>>>>>> * Reduce difference between cdef and def functions
>>>>>>>> * Store runtime evaluated default values inside CyFunction, ticket #674
>>>>>>>> * Implement no-args super(), ticket #696
>>>>>>>> * Function call inlining
>>>>>>> If nobody don't mind I would start with first one.
>>>>> I would love to see this happen.
>>>>>> Please go ahead. :)
>>>>>> Note that you will encounter some problems when enabling name assignments
>>>>>> for all named functions. I tried that at least once and it "didn't work",
>>>>>> but I didn't take the time yet to investigate them further.
>>>>>> I assume you are going to work on this in your own repo?
>>>>> Please also coordinate with Mark's work on function dispatching for
>>>>> fused types.
>>>> I assume that that fused type functions are cdef ones so I think that
>>>> should be easy to merge.
>>>> On the other hand it's better to have Mark's branch merged into master.
>>>> Mark, what is the state of your fused types branch?
>>>> Is it possible to break it into smaller parts to ease reviewing and merging?
>>> It seems I meant memview branch not fusedtypes.
>> There are 2 pending branches, _memview_rebase, which has support for
>> memoryviews, and fusedtypes. The former is ready for merge, it's
>> waiting to be reviewed. The fused types branch needs to subclass
>> CyFunction (it basically modified the old binding function). There was
>> also some duplicate functionality there, so I thought it'd be easier
>> and more convenient to use the utility code loading there.
>> Since it's not a strict dependency and it will be blocking progress, I
>> will try to find some time to get it merge-ready for master.
>> But no, it does cdef, cpdef and def methods, and it has some changes
>> to all function nodes (FuncdefNode, CFuncdefNode and DefNode). These
>> changes shouldn't be major though, but the logic in FusedFuncdefNode
>> does differentiate between all the different functions in order to
>> support them. Feel free to ask me about specifics any time.
> I've moved def node assignment synthesis into
> DefNodeAssignmentSynthesis transformation.
> https://github.com/vitek/cython/commit/efacfed3c9cd8216b6c2100073a9df809b76675a
> Instead of moving defnode into PyCFunctionNode I've inserted
> assignment statement right after defnode.
> This is much more easy and seems ok to me.
> --
> vitja.
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Ah, I thought you were going to wait until fused types were merged. In
any case, this doesn't look like it will give too many conflicts, but
there will be a few. I'm currently moving CyFunction to a utility code
file and making a FusedFunction subclass.

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