Use _PyObject_CallNoArg()

Replace:
    PyObject_CallObject(callable, NULL)
with:
    _PyObject_CallNoArg(callable)

Modules/_asynciomodule.c

@@ -141,7 +141,7 @@ future_init(FutureObj *fut, PyObject *loop)
     _Py_IDENTIFIER(get_debug);
 
     if (loop == NULL || loop == Py_None) {
-        loop = PyObject_CallObject(asyncio_get_event_loop, NULL);
+        loop = _PyObject_CallNoArg(asyncio_get_event_loop);
         if (loop == NULL) {
             return -1;
         }
@@ -158,7 +158,7 @@ future_init(FutureObj *fut, PyObject *loop)
     }
     if (PyObject_IsTrue(res)) {
         Py_CLEAR(res);
-        fut->fut_source_tb = PyObject_CallObject(traceback_extract_stack, NULL);
+        fut->fut_source_tb = _PyObject_CallNoArg(traceback_extract_stack);
         if (fut->fut_source_tb == NULL) {
             return -1;
         }
@@ -204,7 +204,7 @@ future_set_exception(FutureObj *fut, PyObject *exc)
     }
 
     if (PyExceptionClass_Check(exc)) {
-        exc_val = PyObject_CallObject(exc, NULL);
+        exc_val = _PyObject_CallNoArg(exc);
         if (exc_val == NULL) {
             return NULL;
         }
@@ -1429,7 +1429,7 @@ _asyncio_Task_current_task_impl(PyTypeObject *type, PyObject *loop)
     PyObject *res;
 
     if (loop == NULL) {
-        loop = PyObject_CallObject(asyncio_get_event_loop, NULL);
+        loop = _PyObject_CallNoArg(asyncio_get_event_loop);
         if (loop == NULL) {
             return NULL;
         }
@@ -1514,7 +1514,7 @@ _asyncio_Task_all_tasks_impl(PyTypeObject *type, PyObject *loop)
     PyObject *res;
 
     if (loop == NULL) {
-        loop = PyObject_CallObject(asyncio_get_event_loop, NULL);
+        loop = _PyObject_CallNoArg(asyncio_get_event_loop);
         if (loop == NULL) {
             return NULL;
         }
@@ -2387,7 +2387,7 @@ module_init(void)
 
     WITH_MOD("weakref")
     GET_MOD_ATTR(cls, "WeakSet")
-    all_tasks = PyObject_CallObject(cls, NULL);
+    all_tasks = _PyObject_CallNoArg(cls);
     Py_CLEAR(cls);
     if (all_tasks == NULL) {
         goto fail;

Modules/_ctypes/_ctypes.c

@@ -211,7 +211,7 @@ PyDict_SetItemProxy(PyObject *dict, PyObject *key, PyObject *item)
     PyObject *proxy;
     int result;
 
-    obj = PyObject_CallObject((PyObject *)&DictRemover_Type, NULL);
+    obj = _PyObject_CallNoArg((PyObject *)&DictRemover_Type);
     if (obj == NULL)
         return -1;
 
@@ -373,7 +373,7 @@ StructUnionType_new(PyTypeObject *type, PyObject *args, PyObject *kwds, int isSt
     if (PyDict_GetItemString(result->tp_dict, "_abstract_"))
         return (PyObject *)result;
 
-    dict = (StgDictObject *)PyObject_CallObject((PyObject *)&PyCStgDict_Type, NULL);
+    dict = (StgDictObject *)_PyObject_CallNoArg((PyObject *)&PyCStgDict_Type);
     if (!dict) {
         Py_DECREF(result);
         return NULL;
@@ -3654,10 +3654,10 @@ _build_callargs(PyCFuncPtrObject *self, PyObject *argtypes,
                 goto error;
             }
             if (PyCArrayTypeObject_Check(ob))
-                ob = PyObject_CallObject(ob, NULL);
+                ob = _PyObject_CallNoArg(ob);
             else
                 /* Create an instance of the pointed-to type */
-                ob = PyObject_CallObject(dict->proto, NULL);
+                ob = _PyObject_CallNoArg(dict->proto);
             /*
                XXX Is the following correct any longer?
                We must not pass a byref() to the array then but

Modules/_ctypes/stgdict.c

@@ -228,7 +228,7 @@ MakeFields(PyObject *type, CFieldObject *descr,
             }
             continue;
         }
-        new_descr = (CFieldObject *)PyObject_CallObject((PyObject *)&PyCField_Type, NULL);
+        new_descr = (CFieldObject *)_PyObject_CallNoArg((PyObject *)&PyCField_Type);
         if (new_descr == NULL) {
             Py_DECREF(fdescr);
             Py_DECREF(fieldlist);

Modules/_decimal/_decimal.c

@@ -1194,13 +1194,13 @@ context_new(PyTypeObject *type, PyObject *args UNUSED, PyObject *kwds UNUSED)
         return NULL;
     }
 
-    self->traps = PyObject_CallObject((PyObject *)PyDecSignalDict_Type, NULL);
+    self->traps = _PyObject_CallNoArg((PyObject *)PyDecSignalDict_Type);
     if (self->traps == NULL) {
         self->flags = NULL;
         Py_DECREF(self);
         return NULL;
     }
-    self->flags = PyObject_CallObject((PyObject *)PyDecSignalDict_Type, NULL);
+    self->flags = _PyObject_CallNoArg((PyObject *)PyDecSignalDict_Type);
     if (self->flags == NULL) {
         Py_DECREF(self);
         return NULL;
@@ -1395,7 +1395,7 @@ ieee_context(PyObject *dummy UNUSED, PyObject *v)
         goto error;
     }
 
-    context = PyObject_CallObject((PyObject *)&PyDecContext_Type, NULL);
+    context = _PyObject_CallNoArg((PyObject *)&PyDecContext_Type);
     if (context == NULL) {
         return NULL;
     }
@@ -1417,7 +1417,7 @@ context_copy(PyObject *self, PyObject *args UNUSED)
 {
     PyObject *copy;
 
-    copy = PyObject_CallObject((PyObject *)&PyDecContext_Type, NULL);
+    copy = _PyObject_CallNoArg((PyObject *)&PyDecContext_Type);
     if (copy == NULL) {
         return NULL;
     }
@@ -5835,7 +5835,7 @@ PyInit__decimal(void)
 
     /* Init default context template first */
     ASSIGN_PTR(default_context_template,
-               PyObject_CallObject((PyObject *)&PyDecContext_Type, NULL));
+               _PyObject_CallNoArg((PyObject *)&PyDecContext_Type));
     Py_INCREF(default_context_template);
     CHECK_INT(PyModule_AddObject(m, "DefaultContext",
                                  default_context_template));
@@ -5843,7 +5843,7 @@ PyInit__decimal(void)
 #ifdef WITHOUT_THREADS
     /* Init module context */
     ASSIGN_PTR(module_context,
-               PyObject_CallObject((PyObject *)&PyDecContext_Type, NULL));
+               _PyObject_CallNoArg((PyObject *)&PyDecContext_Type));
     Py_INCREF(Py_False);
     CHECK_INT(PyModule_AddObject(m, "HAVE_THREADS", Py_False));
 #else
@@ -5854,7 +5854,7 @@ PyInit__decimal(void)
 
     /* Init basic context template */
     ASSIGN_PTR(basic_context_template,
-               PyObject_CallObject((PyObject *)&PyDecContext_Type, NULL));
+               _PyObject_CallNoArg((PyObject *)&PyDecContext_Type));
     init_basic_context(basic_context_template);
     Py_INCREF(basic_context_template);
     CHECK_INT(PyModule_AddObject(m, "BasicContext",
@@ -5862,7 +5862,7 @@ PyInit__decimal(void)
 
     /* Init extended context template */
     ASSIGN_PTR(extended_context_template,
-               PyObject_CallObject((PyObject *)&PyDecContext_Type, NULL));
+               _PyObject_CallNoArg((PyObject *)&PyDecContext_Type));
     init_extended_context(extended_context_template);
     Py_INCREF(extended_context_template);
     CHECK_INT(PyModule_AddObject(m, "ExtendedContext",

Modules/_functoolsmodule.c

@@ -1246,7 +1246,7 @@ PyInit__functools(void)
     if (m == NULL)
         return NULL;
 
-    kwd_mark = PyObject_CallObject((PyObject *)&PyBaseObject_Type, NULL);
+    kwd_mark = _PyObject_CallNoArg((PyObject *)&PyBaseObject_Type);
     if (!kwd_mark) {
         Py_DECREF(m);
         return NULL;

Modules/_testcapimodule.c

@@ -2277,7 +2277,7 @@ static int _pending_callback(void *arg)
 {
     /* we assume the argument is callable object to which we own a reference */
     PyObject *callable = (PyObject *)arg;
-    PyObject *r = PyObject_CallObject(callable, NULL);
+    PyObject *r = _PyObject_CallNoArg(callable);
     Py_DECREF(callable);
     Py_XDECREF(r);
     return r != NULL ? 0 : -1;

Modules/main.c

@@ -157,7 +157,7 @@ static void RunInteractiveHook(void)
     if (hook == NULL)
         PyErr_Clear();
     else {
-        result = PyObject_CallObject(hook, NULL);
+        result = _PyObject_CallNoArg(hook);
         Py_DECREF(hook);
         if (result == NULL)
             goto error;

Objects/dictobject.c

@@ -1843,7 +1843,7 @@ _PyDict_FromKeys(PyObject *cls, PyObject *iterable, PyObject *value)
     PyObject *d;
     int status;
 
-    d = PyObject_CallObject(cls, NULL);
+    d = _PyObject_CallNoArg(cls);
     if (d == NULL)
         return NULL;
 

Objects/typeobject.c

@@ -1856,7 +1856,7 @@ mro_invoke(PyTypeObject *type)
         PyObject *mro_meth = lookup_method((PyObject *)type, &PyId_mro);
         if (mro_meth == NULL)
             return NULL;
-        mro_result = PyObject_CallObject(mro_meth, NULL);
+        mro_result = _PyObject_CallNoArg(mro_meth);
         Py_DECREF(mro_meth);
     }
     else {
@@ -4032,7 +4032,7 @@ _PyObject_GetState(PyObject *obj, int required)
         Py_DECREF(slotnames);
     }
     else { /* getstate != NULL */
-        state = PyObject_CallObject(getstate, NULL);
+        state = _PyObject_CallNoArg(getstate);
         Py_DECREF(getstate);
         if (state == NULL)
             return NULL;
@@ -4057,7 +4057,7 @@ _PyObject_GetNewArguments(PyObject *obj, PyObject **args, PyObject **kwargs)
        __getnewargs_ex__ on the object. */
     getnewargs_ex = _PyObject_LookupSpecial(obj, &PyId___getnewargs_ex__);
     if (getnewargs_ex != NULL) {
-        PyObject *newargs = PyObject_CallObject(getnewargs_ex, NULL);
+        PyObject *newargs = _PyObject_CallNoArg(getnewargs_ex);
         Py_DECREF(getnewargs_ex);
         if (newargs == NULL) {
             return -1;
@@ -4110,7 +4110,7 @@ _PyObject_GetNewArguments(PyObject *obj, PyObject **args, PyObject **kwargs)
        __getnewargs__ instead. */
     getnewargs = _PyObject_LookupSpecial(obj, &PyId___getnewargs__);
     if (getnewargs != NULL) {
-        *args = PyObject_CallObject(getnewargs, NULL);
+        *args = _PyObject_CallNoArg(getnewargs);
         Py_DECREF(getnewargs);
         if (*args == NULL) {
             return -1;
@@ -4362,7 +4362,7 @@ object_reduce_ex(PyObject *self, PyObject *args)
         override = (clsreduce != objreduce);
         Py_DECREF(clsreduce);
         if (override) {
-            res = PyObject_CallObject(reduce, NULL);
+            res = _PyObject_CallNoArg(reduce);
             Py_DECREF(reduce);
             return res;
         }

Parser/tokenizer.c

@@ -440,7 +440,7 @@ fp_readl(char *s, int size, struct tok_state *tok)
     }
     else
     {
-        bufobj = PyObject_CallObject(tok->decoding_readline, NULL);
+        bufobj = _PyObject_CallNoArg(tok->decoding_readline);
         if (bufobj == NULL)
             goto error;
     }
@@ -533,7 +533,7 @@ fp_setreadl(struct tok_state *tok, const char* enc)
     Py_XSETREF(tok->decoding_readline, readline);
 
     if (pos > 0) {
-        PyObject *bufobj = PyObject_CallObject(readline, NULL);
+        PyObject *bufobj = _PyObject_CallNoArg(readline);
         if (bufobj == NULL)
             return 0;
         Py_DECREF(bufobj);
@@ -650,7 +650,7 @@ decoding_feof(struct tok_state *tok)
     } else {
         PyObject* buf = tok->decoding_buffer;
         if (buf == NULL) {
-            buf = PyObject_CallObject(tok->decoding_readline, NULL);
+            buf = _PyObject_CallNoArg(tok->decoding_readline);
             if (buf == NULL) {
                 error_ret(tok);
                 return 1;

Python/ceval.c

@@ -4198,7 +4198,7 @@ do_raise(PyObject *exc, PyObject *cause)
 
     if (PyExceptionClass_Check(exc)) {
         type = exc;
-        value = PyObject_CallObject(exc, NULL);
+        value = _PyObject_CallNoArg(exc);
         if (value == NULL)
             goto raise_error;
         if (!PyExceptionInstance_Check(value)) {
@@ -4229,7 +4229,7 @@ do_raise(PyObject *exc, PyObject *cause)
     if (cause) {
         PyObject *fixed_cause;
         if (PyExceptionClass_Check(cause)) {
-            fixed_cause = PyObject_CallObject(cause, NULL);
+            fixed_cause = _PyObject_CallNoArg(cause);
             if (fixed_cause == NULL)
                 goto raise_error;
             Py_DECREF(cause);