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.
diff --git a/Objects/memoryobject.c b/Objects/memoryobject.c
index 428d83c..eac07fb 100644
--- a/Objects/memoryobject.c
+++ b/Objects/memoryobject.c
@@ -1939,7 +1939,7 @@
if (format == NULL)
goto error;
- structobj = PyObject_CallFunctionObjArgs(Struct, format, NULL);
+ structobj = _PyObject_CallArg1(Struct, format);
if (structobj == NULL)
goto error;
@@ -1978,7 +1978,7 @@
PyObject *v;
memcpy(x->item, ptr, x->itemsize);
- v = PyObject_CallFunctionObjArgs(x->unpack_from, x->mview, NULL);
+ v = _PyObject_CallArg1(x->unpack_from, x->mview);
if (v == NULL)
return NULL;