[Cython] CyFunction refactoring plan

Vitja Makarov vitja.makarov at gmail.com
Sun Oct 2 20:44:34 CEST 2011

2011/10/2 mark florisson <markflorisson88 at gmail.com>:
> 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.

Yeah, I just had a free time and decided to try. I think fused types
should be merged first.

> I'm currently moving CyFunction to a utility code
> file and making a FusedFunction subclass.

That's cool! Btw, have you seen utility code related bug in hudson it
happens only with py2.4?


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