Implement the invoke methods (invoke, getField, setField, newInstance, apply) as internal natives.

runtime/vm/object.cc

 // 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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 2720 matching lines @@
 
 
 RawField* Class::LookupField(const String& name, intptr_t type) const {
   Isolate* isolate = Isolate::Current();
   if (EnsureIsFinalized(isolate) != Error::null()) {
     return Field::null();
   }
   ReusableHandleScope reused_handles(isolate);
   Array& flds = reused_handles.ArrayHandle();
   flds ^= fields();
+  if (flds.IsNull()) {
+    // This can occur, e.g., for Null classes.
+    return Field::null();
+  }
   Field& field = reused_handles.FieldHandle();
   String& field_name = reused_handles.StringHandle();
   intptr_t len = flds.Length();
   for (intptr_t i = 0; i < len; i++) {
     field ^= flds.At(i);
     field_name ^= field.name();
     if (String::EqualsIgnoringPrivateKey(field_name, name)) {
       if (type == kInstance) {
         if (!field.is_static()) {
           return field.raw();
@@ skipping 11408 matching lines @@
 }
 
 
 void MirrorReference::PrintToJSONStream(JSONStream* stream, bool ref) const {
   stream->OpenObject();
   stream->CloseObject();
 }
 
 
 }  // namespace dart