bpo-35444: Unify and optimize the helper for getting a builtin object. (GH-11047)

This speeds up pickling of some iterators.

This fixes also error handling in pickling methods when fail to
look up builtin "getattr".

1 files changed, 2 insertions, 1 deletions

diff --git a/Objects/setobject.c b/Objects/setobject.c
index c2a1467..a43ecd5 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -842,6 +842,7 @@ static PyObject *setiter_iternext(setiterobject *si);
 static PyObject *
 setiter_reduce(setiterobject *si, PyObject *Py_UNUSED(ignored))
 {
+    _Py_IDENTIFIER(iter);
     /* copy the iterator state */
     setiterobject tmp = *si;
     Py_XINCREF(tmp.si_set);
@@ -852,7 +853,7 @@ setiter_reduce(setiterobject *si, PyObject *Py_UNUSED(ignored))
     if (list == NULL) {
         return NULL;
     }
-    return Py_BuildValue("N(N)", _PyObject_GetBuiltin("iter"), list);
+    return Py_BuildValue("N(N)", _PyEval_GetBuiltinId(&PyId_iter), list);
 }
 
 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");