directly create a generic sequence iterator from PySeqIter_New

Author: timfel

graalpython/com.oracle.graal.python.cext/src/iterobject.c

@@ -45,5 +45,5 @@ PyObject* PySeqIter_New(PyObject *seq) {
         PyErr_BadInternalCall();
         return NULL;
     }
-    return UPCALL_O(PY_BUILTIN, "iter", native_to_java(seq));
+    return UPCALL_CEXT_O("PyTruffle_SeqIter_New", native_to_java(seq));
 }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/TruffleCextBuiltins.java

@@ -85,6 +85,7 @@
 import com.oracle.graal.python.builtins.objects.function.PKeyword;
 import com.oracle.graal.python.builtins.objects.function.PythonCallable;
 import com.oracle.graal.python.builtins.objects.ints.PInt;
+import com.oracle.graal.python.builtins.objects.iterator.PSequenceIterator;
 import com.oracle.graal.python.builtins.objects.object.PythonObject;
 import com.oracle.graal.python.builtins.objects.slice.PSlice;
 import com.oracle.graal.python.builtins.objects.slice.PSlice.SliceInfo;
@@ -1378,6 +1379,15 @@ Object call(@SuppressWarnings("unused") PNone get, PythonCallable set, String na
         }
     }
 
+    @Builtin(name = "PyTruffle_SeqIter_New", fixedNumOfArguments = 1)
+    @GenerateNodeFactory
+    public abstract static class SeqIterNewNode extends PythonBuiltinNode {
+        @Specialization
+        PSequenceIterator call(Object seq) {
+            return factory().createSequenceIterator(seq);
+        }
+    }
+
     @Builtin(name = "PyTruffle_BuiltinMethod", fixedNumOfArguments = 2)
     @GenerateNodeFactory
     public abstract static class BuiltinMethodNode extends PythonBuiltinNode {