bpo-43181: Convert PyObject_TypeCheck to static inline function (GH-24533)

Author: Erlend Egeberg Aasland

Doc/c-api/object.rst

@@ -297,8 +297,8 @@ Object Protocol
 
 .. c:function:: int PyObject_TypeCheck(PyObject *o, PyTypeObject *type)
 
-   Return true if the object *o* is of type *type* or a subtype of *type*.  Both
-   parameters must be non-``NULL``.
+   Return non-zero if the object *o* is of type *type* or a subtype of *type*, and
+   ``0`` otherwise.  Both parameters must be non-``NULL``.
 
 
 .. c:function:: Py_ssize_t PyObject_Size(PyObject *o)

Include/object.h

@@ -235,8 +235,11 @@ PyAPI_FUNC(void *) PyType_GetModuleState(struct _typeobject *);
 
 /* Generic type check */
 PyAPI_FUNC(int) PyType_IsSubtype(PyTypeObject *, PyTypeObject *);
-#define PyObject_TypeCheck(ob, tp) \
-    (Py_IS_TYPE(ob, tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))
+
+static inline int _PyObject_TypeCheck(PyObject *ob, PyTypeObject *type) {
+    return Py_IS_TYPE(ob, type) || PyType_IsSubtype(Py_TYPE(ob), type);
+}
+#define PyObject_TypeCheck(ob, type) _PyObject_TypeCheck(_PyObject_CAST(ob), type)
 
 PyAPI_DATA(PyTypeObject) PyType_Type; /* built-in 'type' */
 PyAPI_DATA(PyTypeObject) PyBaseObject_Type; /* built-in 'object' */

Misc/NEWS.d/next/Core and Builtins/2021-02-11-11-37-14.bpo-43181.ydv33S.rst

@@ -0,0 +1,2 @@
+Convert :c:func:`PyObject_TypeCheck` macro to a static inline function. Patch by
+Erlend E. Aasland.