[New-bugs-announce] [issue39573] Make PyObject an opaque structure in the limited C API
report at bugs.python.org
Thu Feb 6 18:07:12 EST 2020
New submission from STINNER Victor <vstinner at python.org>:
Today, CPython is leaking too many implementation through its public C API. We cannot easily change the "default" C API, but we can enhance the "limited" C API (when Py_LIMITED_API macro is defined). Example of leaking implementation details: memory allocator, garbage collector, structure layouts, etc.
Making PyObject an opaque structure would allow in the long term of modify structures to implement more efficient types (ex: list specialized for small integers), and it can prepare CPython to experiment tagged pointers.
I propose to incremental evolve the existing limited C API towards opaque PyObject, by trying to reduce the risk of breakage.
We may test changes on PyQt which uses the limited C API.
Another idea would be to convert some C extensions of the standard library to the limited C API. It would ensure that the limited C API contains enough functions to be useful, but would also notify us directly if the API is broken.
components: C API
title: Make PyObject an opaque structure in the limited C API
versions: Python 3.9
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