Auto create ApiLocalScope before calling native functions, this ensures that

runtime/vm/native_entry.h

 // 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.
 
 #ifndef VM_NATIVE_ENTRY_H_
 #define VM_NATIVE_ENTRY_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/exceptions.h"
 #include "vm/native_arguments.h"
 #include "vm/verifier.h"
 
 #include "include/dart_api.h"
 
 namespace dart {
 
-DECLARE_FLAG(bool, deoptimize_alot);
-DECLARE_FLAG(bool, trace_natives);
-
 // Forward declarations.
 class Class;
 class String;
 
 typedef void (*NativeFunction)(NativeArguments* arguments);
 
 
 #define NATIVE_ENTRY_FUNCTION(name) BootstrapNatives::DN_##name
 
 #ifdef DEBUG
 #define SET_NATIVE_RETVAL(args, value)                                         \
   RawObject* retval = value;                                                   \
   ASSERT(retval->IsDartInstance());                                            \
   arguments->SetReturnUnsafe(retval);
 #else
 #define SET_NATIVE_RETVAL(arguments, value)                                    \
   arguments->SetReturnUnsafe(value);
 #endif
 
 #define DEFINE_NATIVE_ENTRY(name, argument_count)                              \
   static RawObject* DN_Helper##name(Isolate* isolate,                          \
                                     NativeArguments* arguments);               \
   void NATIVE_ENTRY_FUNCTION(name)(Dart_NativeArguments args) {                \
     CHECK_STACK_ALIGNMENT;                                                     \
     VERIFY_ON_TRANSITION;                                                      \
     NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);     \
     ASSERT(arguments->NativeArgCount() == argument_count);                     \
-    if (FLAG_trace_natives) OS::Print("Calling native: %s\n", ""#name);        \
+    TRACE_NATIVES(""#name);                                                    \
     {                                                                          \
       StackZone zone(arguments->isolate());                                    \
-      HANDLESCOPE(arguments->isolate());                                       \
       SET_NATIVE_RETVAL(arguments,                                             \
                         DN_Helper##name(arguments->isolate(), arguments));     \
-      if (FLAG_deoptimize_alot) DeoptimizeAll();                               \
+      DEOPTIMIZE_ALOT;                                                         \
     }                                                                          \
     VERIFY_ON_TRANSITION;                                                      \
   }                                                                            \
   static RawObject* DN_Helper##name(Isolate* isolate,                          \
                                     NativeArguments* arguments)
 
 
 // Natives should throw an exception if an illegal argument or null is passed.
 // type name = value.
 #define GET_NON_NULL_NATIVE_ARGUMENT(type, name, value)                        \
@@ skipping 19 matching lines @@
       __args__.SetAt(0, __##name##_instance__);                                \
       Exceptions::ThrowByType(Exceptions::kArgument, __args__);                \
     }                                                                          \
   }                                                                            \
   name ^= value;
 
 
 // Helper class for resolving and handling native functions.
 class NativeEntry : public AllStatic {
  public:
+  static const intptr_t kNumCallWrapperArguments = 2;
+
   // Resolve specified dart native function to the actual native entrypoint.
-  static NativeFunction ResolveNative(const Class& cls,
+  static NativeFunction ResolveNative(const Library& library,
                                       const String& function_name,
                                       int number_of_arguments);
+  static void NativeCallWrapper(Dart_NativeArguments args,
+                                Dart_NativeFunction func);
+  static const ExternalLabel& NativeCallWrapperLabel();
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ENTRY_H_