- Avoid running into an unimplemented and add more debugging help.

vm/isolate.cc

 // 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/bigint_store.h"
 #include "vm/code_index_table.h"
@@ skipping 83 matching lines @@
       source_name = source_isolate->name();
     }
     OS::Print("[>] Posting message:\n"
               "\tsource:     %s\n"
               "\treply_port: %lld\n"
               "\tdest:       %s\n"
               "\tdest_port:  %lld\n",
               source_name, message->reply_port(), name(), message->dest_port());
   }
   message_queue()->Enqueue(message);
+  ASSERT(message->priority() < Message::kOOBPriority);
   if (message->priority() >= Message::kOOBPriority) {
     // Handle out of band messages even if the isolate is busy.
     ScheduleInterrupts(Isolate::kMessageInterrupt);
   }
   Dart_MessageNotifyCallback callback = message_notify_callback();
   if (callback) {
     // Allow the embedder to handle message notification.
     (*callback)(Api::CastIsolate(this));
   }
 }
@@ skipping 82 matching lines @@
 }
 
 
 void Isolate::ScheduleInterrupts(uword interrupt_bits) {
   // TODO(turnidge): Can't use MutexLocker here because MutexLocker is
   // a StackResource, which requires a current isolate.  Should
   // MutexLocker really be a StackResource?
   mutex_->Lock();
   ASSERT((interrupt_bits & ~kInterruptsMask) == 0);  // Must fit in mask.
   if (stack_limit_ == saved_stack_limit_) {
-    stack_limit_ = ~static_cast<uword>(0) & ~kInterruptsMask;
+    stack_limit_ = (~static_cast<uword>(0)) & ~kInterruptsMask;
   }
   stack_limit_ |= interrupt_bits;
   mutex_->Unlock();
 }
 
 
 uword Isolate::GetAndClearInterrupts() {
   MutexLocker ml(mutex_);
   if (stack_limit_ == saved_stack_limit_) {
     return 0;  // No interrupt was requested.
@@ skipping 202 matching lines @@
 }
 
 
 void Isolate::VisitWeakPersistentHandles(HandleVisitor* visitor) {
   if (api_state() != NULL) {
     api_state()->VisitWeakHandles(visitor);
   }
 }
 
 }  // namespace dart