Support functional test for Argument Clinic

Lib/test/test_clinic_functionality/__init__.py

@@ -0,0 +1 @@
+from .test_clinic_functionality import *

Lib/test/test_clinic_functionality/__main__.py

@@ -0,0 +1,3 @@
+import unittest
+
+unittest.main('test.test_clinic_functionality')

Lib/test/test_clinic_functionality/setup.py

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+from setuptools import setup, Extension
+from test import support
+
+
+def main():
+    SOURCE = support.findfile('test_clinic_functionality.c', subdir='test_clinic_functionality')
+    module = Extension('test_clinic_functionality', sources=[SOURCE])
+    setup(name='test_clinic_functionality', version='0.0', ext_modules=[module])
+
+
+if __name__ == '__main__':
+    main()

Lib/test/test_clinic_functionality/test_clinic_functionality.c

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+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include "clinic/test_clinic_functionality.c.h"
+
+
+/*[clinic input]
+module  clinic_functional_tester
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=2ee8b0b242501b11]*/
+
+/*[clinic input]
+gh_32092_oob
+
+    pos1: object
+    pos2: object
+    *varargs: object
+    kw1: object = None
+    kw2: object = None
+
+Proof-of-concept of GH-32092 OOB bug.
+
+Array index out-of-bound bug in function
+`_PyArg_UnpackKeywordsWithVararg` .
+
+Calling this function by gh_32092_oob(1, 2, 3, 4, kw1=5, kw2=6)
+to trigger this bug (crash).
+Expected return: (1, 2, (3, 4), 5, 6)
+
+[clinic start generated code]*/
+
+static PyObject *
+gh_32092_oob_impl(PyObject *module, PyObject *pos1, PyObject *pos2,
+                  PyObject *varargs, PyObject *kw1, PyObject *kw2)
+/*[clinic end generated code: output=ee259c130054653f input=91d8e227acf93b02]*/
+{
+    PyObject *tuple = PyTuple_New(5);;
+    PyTuple_SET_ITEM(tuple, 0, Py_NewRef(pos1));
+    PyTuple_SET_ITEM(tuple, 1, Py_NewRef(pos2));
+    PyTuple_SET_ITEM(tuple, 2, Py_NewRef(varargs));
+    PyTuple_SET_ITEM(tuple, 3, Py_NewRef(kw1));
+    PyTuple_SET_ITEM(tuple, 4, Py_NewRef(kw2));
+    return tuple;
+}
+
+/*[clinic input]
+gh_32092_kw_pass
+
+    pos: object
+    *args: object
+    kw: object = None
+
+Proof-of-concept of GH-32092 keyword args passing bug.
+
+The calculation of `noptargs` in AC-generated function
+`builtin_kw_pass_poc` is incorrect.
+
+Calling this function by gh_32092_kw_pass(1, 2, 3)
+to trigger this bug (crash).
+Expected return: (1, (2, 3))
+
+[clinic start generated code]*/
+
+static PyObject *
+gh_32092_kw_pass_impl(PyObject *module, PyObject *pos, PyObject *args,
+                      PyObject *kw)
+/*[clinic end generated code: output=4a2bbe4f7c8604e9 input=c51b7572ac09f193]*/
+{
+    PyObject *tuple = PyTuple_New(3);;
+    PyTuple_SET_ITEM(tuple, 0, Py_NewRef(pos));
+    PyTuple_SET_ITEM(tuple, 1, Py_NewRef(args));
+    PyTuple_SET_ITEM(tuple, 2, Py_NewRef(kw));
+    return tuple;
+}
+
+static PyMethodDef tester_methods[] = {
+    GH_32092_OOB_METHODDEF
+    GH_32092_KW_PASS_METHODDEF
+    {NULL, NULL}
+};
+
+static struct PyModuleDef clinic_functional_tester_module = {
+        PyModuleDef_HEAD_INIT,
+        "clinic_functional_tester",
+        NULL,
+        0,
+        tester_methods,
+        NULL,
+        NULL,
+        NULL,
+        NULL
+};
+
+PyMODINIT_FUNC
+PyInit_test_clinic_functionality(void)
+{
+    return PyModule_Create(&clinic_functional_tester_module);
+}