[Cython] Surprising behaviour wrt. generated tp_clear and tp_dealloc functions

[Torsten Landschoff]

Hi Stefan,

On 04/22/2013 01:50 PM, Stefan Behnel wrote:
> Exactly - an extremely special case. It's an inherent property of the
> Cython language that user visible references are never NULL. (minus
> evil C code, obviously.) 
Suits me.
>> a good idea would be to warn if __dealloc__ actually references a
>> Python attribute that tp_clear could have cleared, with a pointer to the
>> class decorator that exempts the attribute/instance from tp_clear.
> That's a good idea.
>
> Any help with this is appreciated. :)
How can I help? If you want, I can attempt to create a patch and ask you
if I don't make any progress.
I do not have a good grip at Cython sourcecode yet, so if you can give
me a head start by pointing out the locations where I can inject the new
behaviour this would be most welcome.
About the object graph analysis I do not know if that is easily added. I
thought it might be because Cython already has some type inference in
place!?

Greetings, Torsten

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