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Merged
merged 5 commits into from
Jul 7, 2025
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gh-135913: Document ob_refcnt, ob_type, ob_size #135914

merged 5 commits into from
Jul 7, 2025
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encukou
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@encukou encukou commented Jun 25, 2025 •
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@bedevere-app bedevere-app bot added awaiting core review docs Documentation in the Doc dir skip news labels Jun 25, 2025
@github-project-automation github-project-automation bot moved this to Todo in Docs PRs Jun 25, 2025
@bedevere-app bedevere-app bot mentioned this pull request Jun 25, 2025
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colesbury
colesbury reviewed Jun 25, 2025
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Doc/c-api/structures.rst
Comment on lines +36 to +40
.. c:member:: Py_ssize_t ob_refcnt

The object's reference count, as returned by :c:macro:`Py_REFCNT`.
Do not use this field directly; instead use functions and macros such as
:c:macro:`!Py_REFCNT`, :c:func:`Py_INCREF` and :c:func:`Py_DecRef`.
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I don't think this is accurate anymore:

cpython/Include/object.h

Lines 128 to 146 in a88b49c

union {
#if SIZEOF_VOID_P > 4
PY_INT64_T ob_refcnt_full; /* This field is needed for efficient initialization with Clang on ARM */
struct {
# if PY_BIG_ENDIAN
uint16_t ob_flags;
uint16_t ob_overflow;
uint32_t ob_refcnt;
# else
uint32_t ob_refcnt;
uint16_t ob_overflow;
uint16_t ob_flags;
# endif
};
#else
Py_ssize_t ob_refcnt;
#endif
_Py_ALIGNED_DEF(_PyObject_MIN_ALIGNMENT, char) _aligner;
};

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Hm, yes, the type isn't Py_ssize_t any more.
That's an issue in the current documentation too; guess it's time to reopen #125174 for a docs update.
Similarly, a lot of the docs talk about PyObject_HEAD_INIT setting the refcount to 1. I can't fix everything in this PR...

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Sphinx needs a type for .. c:member:. I don't think I can do better than the note below.

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You may mention Py_SET_REFCNT() as well.

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I think all of the others from the refcounting page (Py_XINCREF, Py_CLEAR, etc.) should be mentioned before Py_SET_REFCNT. The “such as” is intended to cover these.

@encukou encukou added the needs backport to 3.14 bugs and security fixes label Jun 26, 2025
vstinner
vstinner reviewed Jul 3, 2025
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Doc/c-api/structures.rst
Comment on lines +36 to +40
.. c:member:: Py_ssize_t ob_refcnt

The object's reference count, as returned by :c:macro:`Py_REFCNT`.
Do not use this field directly; instead use functions and macros such as
:c:macro:`!Py_REFCNT`, :c:func:`Py_INCREF` and :c:func:`Py_DecRef`.
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You may mention Py_SET_REFCNT() as well.

vstinner
vstinner approved these changes Jul 7, 2025
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LGTM

@encukou encukou merged commit 73e1207 into python:main Jul 7, 2025
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@github-project-automation github-project-automation bot moved this from Todo to Done in Docs PRs Jul 7, 2025
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Thanks @encukou for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

@encukou encukou deleted the document-pyobject-fields branch July 7, 2025 12:05
miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Jul 7, 2025
@encukou @miss-islington
pythongh-135913: Document ob_refcnt, ob_type, ob_size (pythonGH-135914)
157c0f9 
* pythongh-135913: Document ob_refcnt, ob_type, ob_size

In `typeobj.rst`, instead of `:c:member:` it would be better to
use `.. c:member::` with a `:no-index:` option, see:

See ref. https://www.sphinx-doc.org/en/master/usage/domains/index.html#basic-markup

However, `c:member` currently does not support `:no-index:`.
(cherry picked from commit 73e1207)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
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bedevere-app bot commented Jul 7, 2025

GH-136377 is a backport of this pull request to the 3.14 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.14 bugs and security fixes label Jul 7, 2025
encukou added a commit that referenced this pull request Jul 8, 2025
@miss-islington @encukou
[3.14] gh-135913: Document ob_refcnt, ob_type, ob_size (GH-135914) (G…
78e5d10 
…H-136377)

gh-135913: Document ob_refcnt, ob_type, ob_size (GH-135914)

* gh-135913: Document ob_refcnt, ob_type, ob_size

In `typeobj.rst`, instead of `:c:member:` it would be better to
use `.. c:member::` with a `:no-index:` option, see:

See ref. https://www.sphinx-doc.org/en/master/usage/domains/index.html#basic-markup

However, `c:member` currently does not support `:no-index:`.
(cherry picked from commit 73e1207)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
AndPuQing pushed a commit to AndPuQing/cpython that referenced this pull request Jul 11, 2025
@encukou @AndPuQing
pythongh-135913: Document ob_refcnt, ob_type, ob_size (pythonGH-135914)
5c1b4be 
* pythongh-135913: Document ob_refcnt, ob_type, ob_size

In `typeobj.rst`, instead of `:c:member:` it would be better to
use `.. c:member::` with a `:no-index:` option, see:

See ref. https://www.sphinx-doc.org/en/master/usage/domains/index.html#basic-markup

However, `c:member` currently does not support `:no-index:`.
Pranjal095 pushed a commit to Pranjal095/cpython that referenced this pull request Jul 12, 2025
@encukou @Pranjal095
pythongh-135913: Document ob_refcnt, ob_type, ob_size (pythonGH-135914)
c1d5b84 
* pythongh-135913: Document ob_refcnt, ob_type, ob_size

In `typeobj.rst`, instead of `:c:member:` it would be better to
use `.. c:member::` with a `:no-index:` option, see:

See ref. https://www.sphinx-doc.org/en/master/usage/domains/index.html#basic-markup

However, `c:member` currently does not support `:no-index:`.
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