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, 3 insertions, 2 deletions

diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index d0f0358..06338fa 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -15444,14 +15444,15 @@ PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(
 static PyObject *
 unicodeiter_reduce(unicodeiterobject *it, PyObject *Py_UNUSED(ignored))
 {
+    _Py_IDENTIFIER(iter);
     if (it->it_seq != NULL) {
-        return Py_BuildValue("N(O)n", _PyObject_GetBuiltin("iter"),
+        return Py_BuildValue("N(O)n", _PyEval_GetBuiltinId(&PyId_iter),
                              it->it_seq, it->it_index);
     } else {
         PyObject *u = (PyObject *)_PyUnicode_New(0);
         if (u == NULL)
             return NULL;
-        return Py_BuildValue("N(N)", _PyObject_GetBuiltin("iter"), u);
+        return Py_BuildValue("N(N)", _PyEval_GetBuiltinId(&PyId_iter), u);
     }
 }