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bpo-39947: Remove old private trashcan C API functions #26869

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merged 1 commit into from Jun 23, 2021

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@vstinner vstinner commented Jun 23, 2021

Remove 4 C API private trashcan functions which were only kept for
the backward compatibility of the stable ABI with Python 3.8 and
older, since the trashcan API was not usable with the limited C API
on Python 3.8 and older. The trashcan API was excluded from the
limited C API in Python 3.9.

The trashcan C API was never usable with the limited C API, since old
trashcan macros accessed directly PyThreadState members like
"_tstate->trash_delete_nesting", whereas the PyThreadState structure
is opaque in the limited C API.

Exclude also the PyTrash_UNWIND_LEVEL constant from the C API.

The trashcan C API was modified in Python 3.9 by commit
38965ec and in Python 3.10 by commit
ed1a5a5 to hide implementation
details.

https://bugs.python.org/issue39947

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vstinner commented Jun 23, 2021

cc @iritkatriel @encukou

Remove 4 private trashcan C API functions which were only kept for the backward
compatibility of the stable ABI with Python 3.8 and older, since the trashcan
API was not usable with the limited C API on Python 3.8 and older. The
trashcan API was excluded from the limited C API in Python 3.9.
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@encukou encukou Jun 23, 2021

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Could you say which ones?

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@vstinner vstinner Jun 23, 2021

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Sure, done.

Remove 4 C API private trashcan functions which were only kept for
the backward compatibility of the stable ABI with Python 3.8 and
older, since the trashcan API was not usable with the limited C API
on Python 3.8 and older. The trashcan API was excluded from the
limited C API in Python 3.9.

Removed functions:

* _PyTrash_deposit_object()
* _PyTrash_destroy_chain()
* _PyTrash_thread_deposit_object()
* _PyTrash_thread_destroy_chain()

The trashcan C API was never usable with the limited C API, since old
trashcan macros accessed directly PyThreadState members like
"_tstate->trash_delete_nesting", whereas the PyThreadState structure
is opaque in the limited C API.

Exclude also the PyTrash_UNWIND_LEVEL constant from the C API.

The trashcan C API was modified in Python 3.9 by commit
38965ec and in Python 3.10 by commit
ed1a5a5 to hide implementation
details.
@vstinner vstinner requested a review from a team as a code owner Jun 23, 2021
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vstinner commented Jun 23, 2021

I updated the PR to list the 4 removed functions in the NEWS entry and I also updated the stable ABI.

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vstinner commented Jun 23, 2021

@encukou: Would you mind to review the updated PR? It now removes the removed functions from the stable ABI.

@vstinner vstinner merged commit db532a0 into python:main Jun 23, 2021
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@vstinner vstinner deleted the trashcan branch Jun 23, 2021
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vstinner commented Jun 23, 2021

Merged, thanks for the review @encukou.

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