From 4bb2a1ebc569eee6f1b46ecef1965a26ae8cb76d Mon Sep 17 00:00:00 2001
From: Erlend Egeberg Aasland <erlend.aasland@innova.no>
Date: Mon, 15 Feb 2021 17:19:24 +0100
Subject: [PATCH] bpo-43181: Convert PyObject_TypeCheck to static inline
 function (GH-24533)

---
 Doc/c-api/object.rst                                       | 4 ++--
 Include/object.h                                           | 7 +++++--
 .../2021-02-11-11-37-14.bpo-43181.ydv33S.rst               | 2 ++
 3 files changed, 9 insertions(+), 4 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2021-02-11-11-37-14.bpo-43181.ydv33S.rst

diff --git a/Doc/c-api/object.rst b/Doc/c-api/object.rst
index a387b4a2df1342..1100af1df2928c 100644
--- a/Doc/c-api/object.rst
+++ b/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)
diff --git a/Include/object.h b/Include/object.h
index 8d0039428e73af..0870e4c6f854c3 100644
--- a/Include/object.h
+++ b/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' */
diff --git a/Misc/NEWS.d/next/Core and Builtins/2021-02-11-11-37-14.bpo-43181.ydv33S.rst b/Misc/NEWS.d/next/Core and Builtins/2021-02-11-11-37-14.bpo-43181.ydv33S.rst
new file mode 100644
index 00000000000000..0e0a5712930d7f
--- /dev/null
+++ b/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.