Replace PyObject_CallFunctionObjArgs() with fastcall

* PyObject_CallFunctionObjArgs(func, NULL) => _PyObject_CallNoArg(func)
* PyObject_CallFunctionObjArgs(func, arg, NULL) => _PyObject_CallArg1(func, arg)

PyObject_CallFunctionObjArgs() allocates 40 bytes on the C stack and requires
extra work to "parse" C arguments to build a C array of PyObject*.

_PyObject_CallNoArg() and _PyObject_CallArg1() are simpler and don't allocate
memory on the C stack.

This change is part of the fastcall project. The change on listsort() is
related to the issue #23507.

1 files changed, 5 insertions, 5 deletions

diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index 6bf04cb..5ea69a0 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -101,7 +101,7 @@ groupby_next(groupbyobject *gbo)
             newkey = newvalue;
             Py_INCREF(newvalue);
         } else {
-            newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc, newvalue, NULL);
+            newkey = _PyObject_CallArg1(gbo->keyfunc, newvalue);
             if (newkey == NULL) {
                 Py_DECREF(newvalue);
                 return NULL;
@@ -293,7 +293,7 @@ _grouper_next(_grouperobject *igo)
             newkey = newvalue;
             Py_INCREF(newvalue);
         } else {
-            newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc, newvalue, NULL);
+            newkey = _PyObject_CallArg1(gbo->keyfunc, newvalue);
             if (newkey == NULL) {
                 Py_DECREF(newvalue);
                 return NULL;
@@ -1130,7 +1130,7 @@ dropwhile_next(dropwhileobject *lz)
         if (lz->start == 1)
             return item;
 
-        good = PyObject_CallFunctionObjArgs(lz->func, item, NULL);
+        good = _PyObject_CallArg1(lz->func, item);
         if (good == NULL) {
             Py_DECREF(item);
             return NULL;
@@ -1296,7 +1296,7 @@ takewhile_next(takewhileobject *lz)
     if (item == NULL)
         return NULL;
 
-    good = PyObject_CallFunctionObjArgs(lz->func, item, NULL);
+    good = _PyObject_CallArg1(lz->func, item);
     if (good == NULL) {
         Py_DECREF(item);
         return NULL;
@@ -3824,7 +3824,7 @@ filterfalse_next(filterfalseobject *lz)
             ok = PyObject_IsTrue(item);
         } else {
             PyObject *good;
-            good = PyObject_CallFunctionObjArgs(lz->func, item, NULL);
+            good = _PyObject_CallArg1(lz->func, item);
             if (good == NULL) {
                 Py_DECREF(item);
                 return NULL;