Sep 15, 2022 · May 3, 2022 · May 3, 2022 · May 3, 2022 · May 3, 2022 · May 3, 2022
diff --git a/Doc/c-api/function.rst b/Doc/c-api/function.rst

   Set the vectorcall field of a given function object *func*

   .. versionadded:: 3.12

 .. c:function:: PyObject* PyFunction_GetClosure(PyObject *op)

diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst
  (Contributed by Wenzel Jakob in :gh:`93012`.)

 * Add new function :c:func:`PyFunction_SetVectorcall` to the C API
  which sets the vectorcall field of a given PyFunctionObject
  which sets the vectorcall field of a given :c:type:`PyFunctionObject`
  Warning: extensions using this API must preserve the behavior
  of the unaltered function!
  (Contributed by Andrew Frost in :gh:`92257`.)

 Porting to Python 3.12
diff --git a/Lib/test/test_call.py b/Lib/test/test_call.py
        function_setvectorcall(f)
        # make sure specializer is triggered by running > 50 times
        for _ in range(51):
            self.assertIsNone(f(num))
            self.assertEqual("overridden",f(num))

 class A:
    def method_two_args(self, x, y):
diff --git a/Misc/NEWS.d/next/C API/2022-05-03-19-35-37.gh-issue-92193.61VoFL.rst b/Misc/NEWS.d/next/C API/2022-05-03-19-35-37.gh-issue-92193.61VoFL.rst
 CPython extensions providing optimized execution of Python bytecode (like Cinder JIT and Pyjion)
 can benefit from being able to modifythe vectorcall fieldon instancesofPyFunctionObject to allow calling the optimized path (e.g. JIT-compiled) directly.
 Add new function :c:func:`PyFunction_SetVectorcall` to the C API
 which setsthe vectorcall field ofa given :c:type:`PyFunctionObject`

 This PR introduces an API call where vectorcall field can be modified like so:

 `void PyFunction_SetVectorcall(PyFunctionObject *func, vectorcallfunc vectorcall);`
 Warning: extensions using this API must preserve the behavior
 of the unaltered function!
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
 static PyObject *
 override_vectorcall(
    PyObject *callable, PyObject *const *args, size_t nargsf, PyObject *kwnames) {
 Py_RETURN_NONE;
 return PyUnicode_FromString("overridden");
 }

 static PyObject *
Original file line number	Diff line number	Diff line change
Expand Up		@@ -673,7 +673,7 @@ def f(num): return num + 1
		function_setvectorcall(f)
		# make sure specializer is triggered by running > 50 times
		for _ in range(51):
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		self.assertIsNone(f(num))
		self.assertEqual("overridden",f(num))

		class A:
		def method_two_args(self, x, y):
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Original file line number	Diff line number	Diff line change
Expand Up		@@ -5359,7 +5359,7 @@ test_pyobject_vectorcall(PyObject self, PyObject args)
		static PyObject *
		override_vectorcall(
		PyObject callable, PyObject const args, size_t nargsf, PyObject kwnames) {
		Py_RETURN_NONE;
		return PyUnicode_FromString("overridden");
		}

		static PyObject *
Expand Down