Skip to content

bpo-39573: Convert Py_TYPE() and Py_SIZE() back to macros #23366

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom
Merged
merged 1 commit into from
Nov 18, 2020
Merged

bpo-39573: Convert Py_TYPE() and Py_SIZE() back to macros #23366

merged 1 commit into from
Nov 18, 2020

Conversation

vstinner
Copy link
Member

@vstinner vstinner commented Nov 18, 2020 •
edited by bedevere-bot
Loading

This change partically reverts the
commit ad3252b.

Many third party C extension modules rely on the ability of using
Py_TYPE() to set an object type: "Py_TYPE(obj) = type;".

https://bugs.python.org/issue39573

hroncok
hroncok reviewed Nov 18, 2020
View reviewed changes
Doc/whatsnew/3.10.rst
#endif

(Contributed by Dong-hee Na in :issue:`39573`.)

* Since :c:func:`Py_REFCNT()` is changed to the inline static function,
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Also this one.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I didn't see any bug report about Py_REFCNT() becoming a static inline function, so I prefer to only change Py_TYPE() and Py_SIZE().

Setting manually the reference counter of an object is a very rare use case. I'm only aware of Cython doing that, and I already updated Cython to use Py_SET_REFCNT() internally.

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

OK.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Note: I'm open to reverting Py_REFCNT() as well if the Py_REFCNT() change breaks too many third party Python projects.

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Ok, I've made a mistake here and I've meant to point out Py_SIZE is not removed. See #23375

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Oh sorry, I misunderstood your comment! Thanks for the PR, it's already merged ;-)

@vstinner
bpo-39573: Convert Py_TYPE() and Py_SIZE() back to macros
741ed78 
This change partically reverts
commit ad3252b
and the commit fe2978b.

Many third party C extension modules rely on the ability of using
Py_TYPE() to set an object type: "Py_TYPE(obj) = type;" or to set an
object type using: "Py_SIZE(obj) = size;".
@vstinner vstinner changed the title bpo-39573: Convert Py_TYPE() back to a macro bpo-39573: Convert Py_TYPE() and Py_SIZE() back to macros Nov 18, 2020
@vstinner
Copy link
Member Author

I updated my PR to revret not only Py_TYPE(), but also Py_SIZE().

See discussion starting at https://bugs.python.org/issue39573#msg379675 for the rationale of revert these changes.

@vstinner vstinner merged commit 0e2ac21 into python:master Nov 18, 2020
@vstinner vstinner deleted the revert_py_type branch November 18, 2020 17:48
adorilson pushed a commit to adorilson/cpython that referenced this pull request Mar 13, 2021
@vstinner @adorilson
bpo-39573: Convert Py_TYPE() and Py_SIZE() back to macros (pythonGH-2…
d8df8fc 
…3366)

This change partically reverts
commit ad3252b
and the commit fe2978b.

Many third party C extension modules rely on the ability of using
Py_TYPE() to set an object type: "Py_TYPE(obj) = type;" or to set an
object type using: "Py_SIZE(obj) = size;".
@vstinner vstinner mentioned this pull request Mar 12, 2024
Closed
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Reviewers

@hroncok hroncok hroncok left review comments

Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

Successfully merging this pull request may close these issues.
4 participants
@vstinner @hroncok @the-knights-who-say-ni @bedevere-bot