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.

5 files changed, 10 insertions, 10 deletions

diff --git a/Python/_warnings.c b/Python/_warnings.c
index 6cfae77..a4ce7d1 100644
--- a/Python/_warnings.c
+++ b/Python/_warnings.c
@@ -415,7 +415,7 @@ call_show_warning(PyObject *category, PyObject *text, PyObject *message,
     if (msg == NULL)
         goto error;
 
-    res = PyObject_CallFunctionObjArgs(show_fn, msg, NULL);
+    res = _PyObject_CallArg1(show_fn, msg);
     Py_DECREF(show_fn);
     Py_DECREF(msg);
 
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 5c92545..1b53897 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -469,7 +469,7 @@ filter_next(filterobject *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;
@@ -1519,7 +1519,7 @@ min_max(PyObject *args, PyObject *kwds, int op)
     while (( item = PyIter_Next(it) )) {
         /* get the value from the key function */
         if (keyfunc != NULL) {
-            val = PyObject_CallFunctionObjArgs(keyfunc, item, NULL);
+            val = _PyObject_CallArg1(keyfunc, item);
             if (val == NULL)
                 goto Fail_it_item;
         }
@@ -2044,9 +2044,9 @@ builtin_round(PyObject *self, PyObject *args, PyObject *kwds)
     }
 
     if (ndigits == NULL || ndigits == Py_None)
-        result = PyObject_CallFunctionObjArgs(round, NULL);
+        result = _PyObject_CallNoArg(round);
     else
-        result = PyObject_CallFunctionObjArgs(round, ndigits, NULL);
+        result = _PyObject_CallArg1(round, ndigits);
     Py_DECREF(round);
     return result;
 }
diff --git a/Python/ceval.c b/Python/ceval.c
index 42c0c61..d4a90c4 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -1756,7 +1756,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
                 Py_DECREF(value);
                 goto error;
             }
-            res = PyObject_CallFunctionObjArgs(hook, value, NULL);
+            res = _PyObject_CallArg1(hook, value);
             Py_DECREF(value);
             if (res == NULL)
                 goto error;
@@ -3062,7 +3062,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
             Py_DECREF(mgr);
             if (enter == NULL)
                 goto error;
-            res = PyObject_CallFunctionObjArgs(enter, NULL);
+            res = _PyObject_CallNoArg(enter);
             Py_DECREF(enter);
             if (res == NULL)
                 goto error;
@@ -3096,7 +3096,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
             }
             SET_TOP(exit);
             Py_DECREF(mgr);
-            res = PyObject_CallFunctionObjArgs(enter, NULL);
+            res = _PyObject_CallNoArg(enter);
             Py_DECREF(enter);
             if (res == NULL)
                 goto error;
diff --git a/Python/import.c b/Python/import.c
index 6bcb1d7..a12b9e2 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -985,7 +985,7 @@ get_path_importer(PyObject *path_importer_cache, PyObject *path_hooks,
         PyObject *hook = PyList_GetItem(path_hooks, j);
         if (hook == NULL)
             return NULL;
-        importer = PyObject_CallFunctionObjArgs(hook, p, NULL);
+        importer = _PyObject_CallArg1(hook, p);
         if (importer != NULL)
             break;
 
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 7906830..2a3f36c 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1098,7 +1098,7 @@ _PySys_GetSizeOf(PyObject *o)
                          Py_TYPE(o)->tp_name);
     }
     else {
-        res = PyObject_CallFunctionObjArgs(method, NULL);
+        res = _PyObject_CallNoArg(method);
         Py_DECREF(method);
     }