Assert typed data is external iff actually not in heap.

runtime/vm/dart_api_impl.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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 3613 matching lines @@
       const TypedData& data_obj = TypedData::Cast(obj);
       data_tmp = data_obj.DataAddr(offset_in_bytes);
     } else {
       ASSERT(ExternalTypedData::IsExternalTypedData(obj));
       const ExternalTypedData& data_obj = ExternalTypedData::Cast(obj);
       data_tmp = data_obj.DataAddr(offset_in_bytes);
       external = true;
     }
   }
   if (FLAG_verify_acquired_data) {
+    if (external) {
+      ASSERT(!isolate->heap()->Contains(reinterpret_cast<uword>(data_tmp)));
+    } else {
+      ASSERT(isolate->heap()->Contains(reinterpret_cast<uword>(data_tmp)));
+    }
     const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(object));
     WeakTable* table = isolate->api_state()->acquired_table();
     intptr_t current = table->GetValue(obj.raw());
     if (current != 0) {
       return Api::NewError("Data was already acquired for this object.");
     }
     // Do not make a copy if the data is external. Some callers expect external
     // data to remain in place, even though the API spec doesn't guarantee it.
     // TODO(koda/asiva): Make final decision and document it.
     AcquiredData* ad = new AcquiredData(data_tmp, size_in_bytes, !external);
@@ skipping 2018 matching lines @@
 
 
 DART_EXPORT void Dart_RegisterRootServiceRequestCallback(
     const char* name,
     Dart_ServiceRequestCallback callback,
     void* user_data) {
   Service::RegisterRootEmbedderCallback(name, callback, user_data);
 }
 
 }  // namespace dart