[Python-Dev] Heap-allocated StructSequences (original) (raw)

Petr Viktorin encukou at gmail.com
Fri Sep 14 12:04:46 EDT 2018

On 09/13/18 23:34, Neil Schemenauer wrote:

On 2018-09-04, Eddie Elizondo wrote:

Solution:

* Fix the implementation of PyStructSequenceNewType: The best solution would be to fix the implementation of this function. This can easily be done by dynamically creating a PyTypeSpec and calling PyTypeFromSpec Hello Eddie, Thank you for spending time to look into this. Without studying the details of your patch, your approach sounds correct to me. I think we should be allocating types from the heap and use PyTypeFromSpec. Having static type definitions living in the data segment cause too many issues. We have to assess how 3rd party extension modules would be affected by this change. Unless it is too hard to do, they should still compile (perhaps with warnings) after your fix. Do you know if that's the case? Looking at your changes to structseq.c, I can't tell easily. In any case, this should go into Victor's pythoncapi fork. That fork includes all the C-API cleanup we are hoping to make to CPython (assuming we can figure out the backwards and forwards compatibility issues).

Nope, Victor's fork doesn't include all C-API cleanup. There's an older long-term effort (PEP-384, PEP-489, the current contenders 576/579/580, and PEP-573 for the future). Converting things to use PyType_FromSpec falls in there. As long as the old API still works, these changes should go in (but they might need a PEP).

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