Auto create ApiLocalScope before calling native functions, this ensures that

runtime/vm/intermediate_language_arm.cc

 // Copyright (c) 2013, 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/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 982 matching lines @@
   if (!function().HasOptionalParameters()) {
     __ AddImmediate(R2, FP, (kParamEndSlotFromFp +
                              function().NumParameters()) * kWordSize);
   } else {
     __ AddImmediate(R2, FP, kFirstLocalSlotFromFp * kWordSize);
   }
   // Compute the effective address. When running under the simulator,
   // this is a redirection address that forces the simulator to call
   // into the runtime system.
   uword entry = reinterpret_cast<uword>(native_c_function());
+  const ExternalLabel* stub_entry;
+  if (is_bootstrap_native()) {
+    stub_entry = &StubCode::CallBootstrapCFunctionLabel();
 #if defined(USING_SIMULATOR)
-  entry = Simulator::RedirectExternalReference(entry,
-                                               Simulator::kNativeCall,
-                                               function().NumParameters());
+    entry = Simulator::RedirectExternalReference(
+        entry, Simulator::kBootstrapNativeCall, function().NumParameters());
 #endif
+  } else {

[regis, 2013/08/06 17:01:22]

For clarity, I would add a comment explaining that the CallNativeCFunction stub
generates the redirection when running under the simulator.
Ditto on the MIPS side.

[siva, 2013/08/06 19:04:26]

Done.

+    stub_entry = &StubCode::CallNativeCFunctionLabel();
+  }
   __ LoadImmediate(R5, entry);
   __ LoadImmediate(R1, NativeArguments::ComputeArgcTag(function()));
   compiler->GenerateCall(token_pos(),
-                         &StubCode::CallNativeCFunctionLabel(),
+                         stub_entry,
                          PcDescriptors::kOther,
                          locs());
   __ Pop(result);
 }
 
 
 LocationSummary* StringFromCharCodeInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   // TODO(fschneider): Allow immediate operands for the char code.
   return LocationSummary::Make(kNumInputs,
@@ skipping 3394 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM