Use the return value of vm native methods to set the return value,

vm/bootstrap_natives.h

 // 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.
 
 #ifndef VM_BOOTSTRAP_NATIVES_H_
 #define VM_BOOTSTRAP_NATIVES_H_
 
 #include "vm/native_entry.h"
 
 // bootstrap dart natives used in the core dart library.
@@ skipping 178 matching lines @@
   V(GrowableObjectArray_setIndexed, 3)                                         \
   V(GrowableObjectArray_getLength, 1)                                          \
   V(GrowableObjectArray_getCapacity, 1)                                        \
   V(GrowableObjectArray_setLength, 2)                                          \
   V(GrowableObjectArray_setData, 2)                                            \
   V(WeakProperty_new, 2)                                                       \
   V(WeakProperty_getKey, 1)                                                    \
   V(WeakProperty_getValue, 1)                                                  \
   V(WeakProperty_setValue, 2)                                                  \
 
-BOOTSTRAP_NATIVE_LIST(DECLARE_NATIVE_ENTRY)
+class BootstrapNatives {

[Ivan Posva, 2012/08/30 00:52:39]

: public AllStatic

+ public:
+  static Dart_NativeFunction Lookup(Dart_Handle name, int argument_count);
+
+#define DECLARE_BOOTSTRAP_NATIVE(name, ignored)         \
+  static void DN_##name(Dart_NativeArguments args);
+
+  BOOTSTRAP_NATIVE_LIST(DECLARE_BOOTSTRAP_NATIVE)
+
+#undef DECLARE_BOOTSTRAP_NATIVE
+};
 
 }  // namespace dart
 
 #endif  // VM_BOOTSTRAP_NATIVES_H_