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bpo-39573: Porting to Python 3.10: Py_SET_SIZE() macro (GH-20610) 

In What's New in Python 3.10, propose Py_SET_SIZE(), Py_SET_REFCNT()
and Py_SET_TYPE() macros for backward compatibility with Python 3.9
and older.
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Victor Stinner 2020-06-04 22:10:43 +02:00 committed by GitHub
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Doc/whatsnew/3.10.rst
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@ -135,17 +135,35 @@ Porting to Python 3.10
* Since :c:func:`Py_TYPE()` is changed to the inline static function,
``Py_TYPE(obj) = new_type`` must be replaced with ``Py_SET_TYPE(obj, new_type)``:
see :c:func:`Py_SET_TYPE()` (available since Python 3.9).
see :c:func:`Py_SET_TYPE()` (available since Python 3.9). For backward
compatibility, this macro can be used::
#if PY_VERSION_HEX < 0x030900A4
# define Py_SET_TYPE(obj, type) ((Py_TYPE(obj) = (type)), (void)0)
#endif
(Contributed by Dong-hee Na in :issue:`39573`.)
* Since :c:func:`Py_REFCNT()` is changed to the inline static function,
``Py_REFCNT(obj) = new_refcnt`` must be replaced with ``Py_SET_REFCNT(obj, new_refcnt)``:
see :c:func:`Py_SET_REFCNT()` (available since Python 3.9).
see :c:func:`Py_SET_REFCNT()` (available since Python 3.9). For backward
compatibility, this macro can be used::
#if PY_VERSION_HEX < 0x030900A4
# define Py_SET_REFCNT(obj, refcnt) ((Py_REFCNT(obj) = (refcnt)), (void)0)
#endif
(Contributed by Victor Stinner in :issue:`39573`.)
* Since :c:func:`Py_SIZE()` is changed to the inline static function,
``Py_SIZE(obj) = new_size`` must be replaced with ``Py_SET_SIZE(obj, new_size)``:
see :c:func:`Py_SET_SIZE()` (available since Python 3.9).
see :c:func:`Py_SET_SIZE()` (available since Python 3.9). For backward
compatibility, this macro can be used::
#if PY_VERSION_HEX < 0x030900A4
# define Py_SET_SIZE(obj, size) ((Py_SIZE(obj) = (size)), (void)0)
#endif
(Contributed by Victor Stinner in :issue:`39573`.)
* Calling :c:func:`PyDict_GetItem` without :term:`GIL` held had been allowed