Implement a native identical function in the VM.

runtime/lib/identical.cc

Index: runtime/lib/identical.cc
diff --git a/runtime/lib/identical.cc b/runtime/lib/identical.cc
new file mode 100644
index 0000000000000000000000000000000000000000..85829560701de049e953b3931a2c3f46608e0010
--- /dev/null
+++ b/runtime/lib/identical.cc
@@ -0,0 +1,23 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "vm/bootstrap_natives.h"
+
+namespace dart {
+
+DEFINE_NATIVE_ENTRY(Identical_comparison, 2) {
+  GET_NON_NULL_NATIVE_ARGUMENT(
+     Instance, a, arguments->NativeArgAt(0));
+  GET_NON_NULL_NATIVE_ARGUMENT(
+     Instance, b, arguments->NativeArgAt(1));
+  // If the objects are both smi's, compare their values.
+  if (a.IsSmi() && b.IsSmi()) {
+    return Bool::Get(a.Equals(b));

[srdjan, 2012/12/17 19:42:47]

YOu need to do the same for Doubles, Mints and Bigints

[Max Heinritz (Google), 2012/12/17 21:15:23]

Done.

+  }
+  // If the objects are not smi's, then compare their references.
+  return Bool::Get(a.raw() == b.raw());
+}
+
+
+}  // namespace dart