gh-111178: Change Argument Clinic signature for METH_O (#130682)

Use "PyObject*" for METH_O functions to fix an undefined behavior.

Python/bltinmodule.c

@@ -1303,8 +1303,8 @@ This is guaranteed to be unique among simultaneously existing objects.
 [clinic start generated code]*/
 
 static PyObject *
-builtin_id(PyModuleDef *self, PyObject *v)
-/*[clinic end generated code: output=0aa640785f697f65 input=5a534136419631f4]*/
+builtin_id_impl(PyModuleDef *self, PyObject *v)
+/*[clinic end generated code: output=4908a6782ed343e9 input=5a534136419631f4]*/
 {
     PyObject *id = PyLong_FromVoidPtr(v);
 

Python/clinic/bltinmodule.c.h

@@ -628,6 +628,19 @@ PyDoc_STRVAR(builtin_id__doc__,
 #define BUILTIN_ID_METHODDEF    \
     {"id", (PyCFunction)builtin_id, METH_O, builtin_id__doc__},
 
+static PyObject *
+builtin_id_impl(PyModuleDef *self, PyObject *v);
+
+static PyObject *
+builtin_id(PyObject *self, PyObject *v)
+{
+    PyObject *return_value = NULL;
+
+    return_value = builtin_id_impl((PyModuleDef *)self, v);
+
+    return return_value;
+}
+
 PyDoc_STRVAR(builtin_setattr__doc__,
 "setattr($module, obj, name, value, /)\n"
 "--\n"
@@ -1239,4 +1252,4 @@ builtin_issubclass(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=b0178189d13e8bf8 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=c08e0e086a791ff0 input=a9049054013a1b77]*/

Python/clinic/context.c.h

@@ -168,6 +168,19 @@ PyDoc_STRVAR(_contextvars_ContextVar_set__doc__,
 #define _CONTEXTVARS_CONTEXTVAR_SET_METHODDEF    \
     {"set", (PyCFunction)_contextvars_ContextVar_set, METH_O, _contextvars_ContextVar_set__doc__},
 
+static PyObject *
+_contextvars_ContextVar_set_impl(PyContextVar *self, PyObject *value);
+
+static PyObject *
+_contextvars_ContextVar_set(PyObject *self, PyObject *value)
+{
+    PyObject *return_value = NULL;
+
+    return_value = _contextvars_ContextVar_set_impl((PyContextVar *)self, value);
+
+    return return_value;
+}
+
 PyDoc_STRVAR(_contextvars_ContextVar_reset__doc__,
 "reset($self, token, /)\n"
 "--\n"
@@ -180,6 +193,19 @@ PyDoc_STRVAR(_contextvars_ContextVar_reset__doc__,
 #define _CONTEXTVARS_CONTEXTVAR_RESET_METHODDEF    \
     {"reset", (PyCFunction)_contextvars_ContextVar_reset, METH_O, _contextvars_ContextVar_reset__doc__},
 
+static PyObject *
+_contextvars_ContextVar_reset_impl(PyContextVar *self, PyObject *token);
+
+static PyObject *
+_contextvars_ContextVar_reset(PyObject *self, PyObject *token)
+{
+    PyObject *return_value = NULL;
+
+    return_value = _contextvars_ContextVar_reset_impl((PyContextVar *)self, token);
+
+    return return_value;
+}
+
 PyDoc_STRVAR(token_enter__doc__,
 "__enter__($self, /)\n"
 "--\n"
@@ -230,4 +256,4 @@ token_exit(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=01987cdbf68a951a input=a9049054013a1b77]*/
+/*[clinic end generated code: output=3a04b2fddf24c3e9 input=a9049054013a1b77]*/

Python/context.c

@@ -1058,8 +1058,8 @@ value via the `ContextVar.reset()` method.
 [clinic start generated code]*/
 
 static PyObject *
-_contextvars_ContextVar_set(PyContextVar *self, PyObject *value)
-/*[clinic end generated code: output=446ed5e820d6d60b input=c0a6887154227453]*/
+_contextvars_ContextVar_set_impl(PyContextVar *self, PyObject *value)
+/*[clinic end generated code: output=1b562d35cc79c806 input=c0a6887154227453]*/
 {
     return PyContextVar_Set((PyObject *)self, value);
 }
@@ -1076,8 +1076,8 @@ created the token was used.
 [clinic start generated code]*/
 
 static PyObject *
-_contextvars_ContextVar_reset(PyContextVar *self, PyObject *token)
-/*[clinic end generated code: output=d4ee34d0742d62ee input=ebe2881e5af4ffda]*/
+_contextvars_ContextVar_reset_impl(PyContextVar *self, PyObject *token)
+/*[clinic end generated code: output=3205d2bdff568521 input=ebe2881e5af4ffda]*/
 {
     if (!PyContextToken_CheckExact(token)) {
         PyErr_Format(PyExc_TypeError,