Implement safepointing of threads

runtime/vm/dart_api_impl.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_DART_API_IMPL_H_
 #define VM_DART_API_IMPL_H_
 
 #include "vm/allocation.h"
 #include "vm/native_arguments.h"
 #include "vm/object.h"
+#include "vm/safepoint.h"
 
 namespace dart {
 
 class ApiLocalScope;
 class ApiState;
 class FinalizablePersistentHandle;
 class LocalHandle;
 class PersistentHandle;
 class ReusableObjectHandleScope;
 
@@ skipping 23 matching lines @@
 // Checks that the current isolate is not NULL and that it has an API scope.
 #define CHECK_API_SCOPE(thread)                                                \
   do {                                                                         \
     Thread* tmpT = (thread);                                                   \
     Isolate* tmpI = tmpT->isolate();                                           \
     CHECK_ISOLATE(tmpI);                                                       \
     if (tmpT->api_top_scope() == NULL) {                                       \
       FATAL1("%s expects to find a current scope. Did you forget to call "     \
            "Dart_EnterScope?", CURRENT_FUNC);                                  \
     }                                                                          \
-  } while (0)
+  } while (0);                                                                 \
 
 #define DARTSCOPE(thread)                                                      \
   Thread* T = (thread);                                                        \
   CHECK_API_SCOPE(T);                                                          \
+  TransitionNativeToVM trainsition(T);                                         \
   HANDLESCOPE(T);
 
 
 #define RETURN_TYPE_ERROR(zone, dart_handle, type)                             \
   do {                                                                         \
     const Object& tmp =                                                        \
         Object::Handle(zone, Api::UnwrapHandle((dart_handle)));                \
     if (tmp.IsNull()) {                                                        \
       return Api::NewError("%s expects argument '%s' to be non-null.",         \
                            CURRENT_FUNC, #dart_handle);                        \
@@ skipping 220 matching lines @@
     return Api::NewError("%s: Cannot load after Dart_Precompile",              \
                          CURRENT_FUNC);                                        \
   }                                                                            \
 
 #define ASSERT_CALLBACK_STATE(thread)                                         \
   ASSERT(thread->no_callback_scope_depth() == 0)
 
 }  // namespace dart.
 
 #endif  // VM_DART_API_IMPL_H_