Auto create ApiLocalScope before calling native functions, this ensures that

runtime/vm/native_arguments.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_NATIVE_ARGUMENTS_H_
 #define VM_NATIVE_ARGUMENTS_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/simulator.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
+DECLARE_FLAG(bool, deoptimize_alot);
+DECLARE_FLAG(bool, trace_natives);
+DECLARE_FLAG(bool, verify_on_transition);
+
 // Forward declarations.
 class BootstrapNatives;
 class Isolate;
 class Object;
 class RawObject;
 class Simulator;
 
-
 #if defined(TESTING) || defined(DEBUG)
 
 #if defined(USING_SIMULATOR)
 #define CHECK_STACK_ALIGNMENT {                                                \
   uword current_sp = Simulator::Current()->get_register(SPREG);                \
   ASSERT((OS::ActivationFrameAlignment() == 0) ||                              \
          (Utils::IsAligned(current_sp, OS::ActivationFrameAlignment())));      \
 }
 #elif defined(TARGET_OS_WINDOWS)
 // The compiler may dynamically align the stack on Windows, so do not check.
 #define CHECK_STACK_ALIGNMENT { }
 #else
 #define CHECK_STACK_ALIGNMENT {                                                \
   uword (*func)() =                                                            \
       reinterpret_cast<uword (*)()>(StubCode::GetStackPointerEntryPoint());    \
   uword current_sp = func();                                                   \
   ASSERT((OS::ActivationFrameAlignment() == 0) ||                              \
          (Utils::IsAligned(current_sp, OS::ActivationFrameAlignment())));      \
 }
 #endif
 
+#define VERIFY_ON_TRANSITION                                                   \
+  if (FLAG_verify_on_transition) {                                             \
+    VerifyPointersVisitor::VerifyPointers();                                   \
+    Isolate::Current()->heap()->Verify();                                      \
+  }
+#define TRACE_NATIVES(name)                                                    \
+  if (FLAG_trace_natives) {                                                    \
+    OS::Print("Calling native: %s\n", name);                                   \
+  }
+#define DEOPTIMIZE_ALOT                                                        \
+  if (FLAG_deoptimize_alot) {                                                  \
+    DeoptimizeAll();                                                           \
+  }
+
 #else
 
 #define CHECK_STACK_ALIGNMENT { }
+#define VERIFY_ON_TRANSITION { }
+#define TRACE_NATIVES(name) { }
+#define DEOPTIMIZE_ALOT { }
 
 #endif
 
 
 // Class NativeArguments is used to access arguments passed in from
 // generated dart code to a runtime function or a dart library native
 // function. It is also used to set the return value if any at the slot
 // reserved for return values.
 // All runtime function/dart library native functions have the
 // following signature:
@@ skipping 111 matching lines @@
 
   Isolate* isolate_;  // Current isolate pointer.
   int argc_tag_;  // Encodes argument count and invoked native call type.
   RawObject*(*argv_)[];  // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ARGUMENTS_H_