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

vm/native_entry_test.cc

 // Copyright (c) 2011, 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/native_entry_test.h"
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
@@ skipping 33 matching lines @@
 
 // A native call for test purposes.
 // Arg0: a smi.
 // Arg1: a smi.
 // Result: a smi representing arg0 - arg1.
 DEFINE_NATIVE_ENTRY(TestSmiSub, 2) {
   const Smi& left = Smi::CheckedHandle(arguments->At(0));
   const Smi& right = Smi::CheckedHandle(arguments->At(1));
   // Ignoring overflow in the calculation below.
   intptr_t result = left.Value() - right.Value();
-  arguments->SetReturn(Smi::Handle(Smi::New(result)));
+  return Smi::New(result);
 }
 
 
 // A native call for test purposes.
 // Arg0-4: 5 smis.
 // Result: a smi representing the sum of all arguments.
 DEFINE_NATIVE_ENTRY(TestSmiSum, 5) {
   intptr_t result = 0;
   for (int i = 0; i < arguments->Count(); i++) {
     const Smi& arg = Smi::CheckedHandle(arguments->At(i));
     // Ignoring overflow in the addition below.
     result += arg.Value();
   }
-  arguments->SetReturn(Smi::Handle(Smi::New(result)));
+  return Smi::New(result);
 }
 
 
 // Test code patching.
 DEFINE_NATIVE_ENTRY(TestStaticCallPatching, 0) {
   uword target_address = 0;
   Function& target_function = Function::Handle();
   DartFrameIterator iterator;
   iterator.NextFrame();  // Skip native call.
   StackFrame* static_caller_frame = iterator.NextFrame();
   CodePatcher::GetStaticCallAt(static_caller_frame->pc(),
                                &target_function,
                                &target_address);
   EXPECT(String::Handle(target_function.name()).
       Equals(String::Handle(String::New("NativePatchStaticCall"))));
   const uword function_entry_address =
       Code::Handle(target_function.CurrentCode()).EntryPoint();
   EXPECT_EQ(function_entry_address, target_address);
+  return Object::null();
 }
 
 }  // namespace dart