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gh-98724: Fix type punning issue in Py_SETREF() #99739

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gh-98724: Fix type punning issue in Py_SETREF() #99739

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12 changes: 6 additions & 6 deletions Include/cpython/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -325,9 +325,9 @@ PyAPI_FUNC(PyObject *) _PyObject_FunctionStr(PyObject *);
*/
#define Py_SETREF(dst, src) \
do { \
PyObject **_tmp_dst_ptr = _Py_CAST(PyObject**, &(dst)); \
PyObject *_tmp_dst = (*_tmp_dst_ptr); \
*_tmp_dst_ptr = _PyObject_CAST(src); \
_PY_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \
_PY_TYPEOF(dst) _tmp_dst = *_tmp_dst_ptr; \
*_tmp_dst_ptr = (src); \
Py_DECREF(_tmp_dst); \
} while (0)

Expand All @@ -336,9 +336,9 @@ PyAPI_FUNC(PyObject *) _PyObject_FunctionStr(PyObject *);
*/
#define Py_XSETREF(dst, src) \
do { \
PyObject **_tmp_dst_ptr = _Py_CAST(PyObject**, &(dst)); \
PyObject *_tmp_dst = (*_tmp_dst_ptr); \
*_tmp_dst_ptr = _PyObject_CAST(src); \
_PY_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \
_PY_TYPEOF(dst) _tmp_dst = *_tmp_dst_ptr; \
*_tmp_dst_ptr = (src); \
Py_XDECREF(_tmp_dst); \
} while (0)

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4 changes: 2 additions & 2 deletions Include/object.h
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Expand Up @@ -604,9 +604,9 @@ static inline void Py_DECREF(PyObject *op)
*/
#define Py_CLEAR(op) \
do { \
PyObject **_py_tmp_ptr = _Py_CAST(PyObject**, &(op)); \
_PY_TYPEOF(op)* _py_tmp_ptr = &(op); \
if (*_py_tmp_ptr != NULL) { \
PyObject* _py_tmp = (*_py_tmp_ptr); \
_PY_TYPEOF(op) _py_tmp = *_py_tmp_ptr; \
*_py_tmp_ptr = NULL; \
Py_DECREF(_py_tmp); \
} \
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3 changes: 3 additions & 0 deletions Include/pyport.h
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Expand Up @@ -717,4 +717,7 @@ extern char * _getpty(int *, int, mode_t, int);
# endif
#endif

// Get the type of an expression
#define _PY_TYPEOF(EXPR) __typeof__(EXPR)

#endif /* Py_PYPORT_H */