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[3.12] gh-102304: Fix Py_INCREF() for limited C API 3.9 #105553

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Merged
merged 2 commits into from
Jun 9, 2023
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[3.12] gh-102304: Fix Py_INCREF() for limited C API 3.9 #105553

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39e5ae9
gh-102304: Fix Py_INCREF() for limited C API 3.9 (#105550)
vstinner Jun 9, 2023
a9f0a25
gh-102304: Remove Py_INCREF() doc change (#105552)
vstinner Jun 9, 2023
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9 changes: 0 additions & 9 deletions Doc/whatsnew/3.12.rst
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Expand Up @@ -1536,15 +1536,6 @@ Build Changes
:file:`!configure`.
(Contributed by Christian Heimes in :gh:`89886`.)

* C extensions built with the :ref:`limited C API <limited-c-api>`
on :ref:`Python build in debug mode <debug-build>` no longer support Python
3.9 and older. In this configuration, :c:func:`Py_INCREF` and
:c:func:`Py_DECREF` are now always implemented as opaque function calls,
but the called functions were added to Python 3.10. Build C extensions
with a release build of Python or with Python 3.12 and older, to keep support
for Python 3.9 and older.
(Contributed by Victor Stinner in :gh:`102304`.)


C API Changes
=============
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16 changes: 14 additions & 2 deletions Include/object.h
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Expand Up @@ -611,8 +611,14 @@ PyAPI_FUNC(void) _Py_DecRef(PyObject *);
static inline Py_ALWAYS_INLINE void Py_INCREF(PyObject *op)
{
#if defined(Py_REF_DEBUG) && defined(Py_LIMITED_API)
// Stable ABI for Python built in debug mode
// Stable ABI for Python built in debug mode. _Py_IncRef() was added to
// Python 3.10.0a7, use Py_IncRef() on older Python versions. Py_IncRef()
// accepts NULL whereas _Py_IncRef() doesn't.
# if Py_LIMITED_API+0 >= 0x030a00A7
_Py_IncRef(op);
# else
Py_IncRef(op);
# endif
#else
// Non-limited C API and limited C API for Python 3.9 and older access
// directly PyObject.ob_refcnt.
Expand Down Expand Up @@ -642,9 +648,15 @@ static inline Py_ALWAYS_INLINE void Py_INCREF(PyObject *op)
#endif

#if defined(Py_REF_DEBUG) && defined(Py_LIMITED_API)
// Stable ABI for Python built in debug mode
// Stable ABI for Python built in debug mode. _Py_DecRef() was added to Python
// 3.10.0a7, use Py_DecRef() on older Python versions. Py_DecRef() accepts NULL
// whereas _Py_IncRef() doesn't.
static inline void Py_DECREF(PyObject *op) {
# if Py_LIMITED_API+0 >= 0x030a00A7
_Py_DecRef(op);
# else
Py_DecRef(op);
# endif
}
#define Py_DECREF(op) Py_DECREF(_PyObject_CAST(op))

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