bpo-42262: Add Py_NewRef() and Py_XNewRef() (GH-23152)
Added Py_NewRef() and Py_XNewRef() functions to increment the reference count of an object and return the object.
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@ -16,12 +16,43 @@ objects.
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Increment the reference count for object *o*. The object must not be ``NULL``; if
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you aren't sure that it isn't ``NULL``, use :c:func:`Py_XINCREF`.
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See also :c:func:`Py_NewRef`.
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.. c:function:: void Py_XINCREF(PyObject *o)
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Increment the reference count for object *o*. The object may be ``NULL``, in
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which case the macro has no effect.
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See also :c:func:`Py_XNewRef`.
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.. c:function:: PyObject* Py_NewRef(PyObject *o)
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Increment the reference count of the object *o* and return the object *o*.
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The object *o* must not be ``NULL``.
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For example::
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Py_INCREF(obj);
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self->attr = obj;
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can be written as::
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self->attr = Py_NewRef(obj);
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.. versionadded:: 3.10
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.. c:function:: PyObject* Py_XNewRef(PyObject *o)
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Similar to :c:func:`Py_NewRef`, but the object *o* can be NULL.
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If the object *o* is ``NULL``, the function just returns ``NULL``.
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.. versionadded:: 3.10
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.. c:function:: void Py_DECREF(PyObject *o)
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@ -379,6 +379,10 @@ New Features
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success.
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(Contributed by Victor Stinner in :issue:`1635741`.)
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* Added :c:func:`Py_NewRef` and :c:func:`Py_XNewRef` functions to increment the
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reference count of an object and return the object.
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(Contributed by Victor Stinner in :issue:`42262`.)
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Porting to Python 3.10
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----------------------
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@ -22,8 +22,8 @@ PyAPI_DATA(struct _longobject) _Py_FalseStruct, _Py_TrueStruct;
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#define Py_True ((PyObject *) &_Py_TrueStruct)
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/* Macros for returning Py_True or Py_False, respectively */
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#define Py_RETURN_TRUE return Py_INCREF(Py_True), Py_True
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#define Py_RETURN_FALSE return Py_INCREF(Py_False), Py_False
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#define Py_RETURN_TRUE return Py_NewRef(Py_True)
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#define Py_RETURN_FALSE return Py_NewRef(Py_False)
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/* Function to return a bool from a C long */
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PyAPI_FUNC(PyObject *) PyBool_FromLong(long);
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@ -526,6 +526,31 @@ they can have object code that is not dependent on Python compilation flags.
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PyAPI_FUNC(void) Py_IncRef(PyObject *);
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PyAPI_FUNC(void) Py_DecRef(PyObject *);
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// Increment the reference count of the object and return the object.
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PyAPI_FUNC(PyObject*) Py_NewRef(PyObject *obj);
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// Similar to Py_NewRef() but the object can be NULL.
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PyAPI_FUNC(PyObject*) Py_XNewRef(PyObject *obj);
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static inline PyObject* _Py_NewRef(PyObject *obj)
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{
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Py_INCREF(obj);
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return obj;
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}
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static inline PyObject* _Py_XNewRef(PyObject *obj)
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{
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Py_XINCREF(obj);
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return obj;
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}
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// Py_NewRef() and Py_XNewRef() are exported as functions for the stable ABI.
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// Names overriden with macros by static inline functions for best
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// performances.
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#define Py_NewRef(obj) _Py_NewRef(obj)
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#define Py_XNewRef(obj) _Py_XNewRef(obj)
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/*
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_Py_NoneStruct is an object of undefined type which can be used in contexts
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where NULL (nil) is not suitable (since NULL often means 'error').
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@ -536,7 +561,7 @@ PyAPI_DATA(PyObject) _Py_NoneStruct; /* Don't use this directly */
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#define Py_None (&_Py_NoneStruct)
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/* Macro for returning Py_None from a function */
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#define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
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#define Py_RETURN_NONE return Py_NewRef(Py_None)
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/*
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Py_NotImplemented is a singleton used to signal that an operation is
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@ -546,8 +571,7 @@ PyAPI_DATA(PyObject) _Py_NotImplementedStruct; /* Don't use this directly */
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#define Py_NotImplemented (&_Py_NotImplementedStruct)
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/* Macro for returning Py_NotImplemented from a function */
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#define Py_RETURN_NOTIMPLEMENTED \
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return Py_INCREF(Py_NotImplemented), Py_NotImplemented
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#define Py_RETURN_NOTIMPLEMENTED return Py_NewRef(Py_NotImplemented)
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/* Rich comparison opcodes */
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#define Py_LT 0
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@ -0,0 +1,2 @@
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Added :c:func:`Py_NewRef` and :c:func:`Py_XNewRef` functions to increment the
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reference count of an object and return the object. Patch by Victor Stinner.
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@ -2208,6 +2208,22 @@ PyObject_GET_WEAKREFS_LISTPTR(PyObject *op)
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}
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#undef Py_NewRef
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#undef Py_XNewRef
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// Export Py_NewRef() and Py_XNewRef() as regular functions for the stable ABI.
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PyObject*
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Py_NewRef(PyObject *obj)
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{
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return _Py_NewRef(obj);
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}
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PyObject*
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Py_XNewRef(PyObject *obj)
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{
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return _Py_XNewRef(obj);
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}
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#ifdef __cplusplus
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}
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#endif
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@ -40,8 +40,8 @@ EXPORT_FUNC(Py_AddPendingCall)
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EXPORT_FUNC(Py_AtExit)
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EXPORT_FUNC(Py_BuildValue)
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EXPORT_FUNC(Py_CompileString)
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EXPORT_FUNC(Py_DecodeLocale)
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EXPORT_FUNC(Py_DecRef)
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EXPORT_FUNC(Py_DecodeLocale)
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EXPORT_FUNC(Py_EncodeLocale)
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EXPORT_FUNC(Py_EndInterpreter)
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EXPORT_FUNC(Py_EnterRecursiveCall)
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@ -72,6 +72,7 @@ EXPORT_FUNC(Py_LeaveRecursiveCall)
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EXPORT_FUNC(Py_Main)
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EXPORT_FUNC(Py_MakePendingCalls)
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EXPORT_FUNC(Py_NewInterpreter)
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EXPORT_FUNC(Py_NewRef)
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EXPORT_FUNC(Py_ReprEnter)
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EXPORT_FUNC(Py_ReprLeave)
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EXPORT_FUNC(Py_SetPath)
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@ -80,6 +81,7 @@ EXPORT_FUNC(Py_SetPythonHome)
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EXPORT_FUNC(Py_SetRecursionLimit)
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EXPORT_FUNC(Py_SymtableString)
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EXPORT_FUNC(Py_VaBuildValue)
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EXPORT_FUNC(Py_XNewRef)
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EXPORT_FUNC(PyArg_Parse)
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EXPORT_FUNC(PyArg_ParseTuple)
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EXPORT_FUNC(PyArg_ParseTupleAndKeywords)
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