Fix for issues 6080 - pass in the Isolate's top context into the stub for invoking dart code from n…

runtime/vm/stack_frame.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/stack_frame.h"
 
 #include "vm/assembler_macros.h"
 #include "vm/deopt_instructions.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 17 matching lines @@
 void StackFrame::Print() const {
   OS::Print("[%-8s : sp(%#"Px") ]\n", GetName(), sp());
 }
 
 
 void ExitFrame::VisitObjectPointers(ObjectPointerVisitor* visitor) {
   // There are no objects to visit in this frame.
 }
 
 
+RawContext* EntryFrame::SavedContext() const {
+  return *(reinterpret_cast<RawContext**>(fp() + SavedContextOffset()));
+}
+
+
 void EntryFrame::VisitObjectPointers(ObjectPointerVisitor* visitor) {
   // Visit objects between SP and (FP - callee_save_area).
   ASSERT(visitor != NULL);
   RawObject** start = reinterpret_cast<RawObject**>(sp());
   RawObject** end = reinterpret_cast<RawObject**>(
       fp() - kWordSize + ExitLinkOffset());
   visitor->VisitPointers(start, end);
 }
 
 
@@ skipping 284 matching lines @@
                                            &func);
       code_ = func.unoptimized_code();
       function_ = func.raw();
       return;
     }
   }
   SetDone();
 }
 
 }  // namespace dart