- GET_NATIVE_ARGUMENT uses the isolate which is passed in to allocate the handle.

runtime/vm/raw_object.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/raw_object.h"
 
 #include "vm/class_table.h"
 #include "vm/freelist.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 275 matching lines @@
         FreeListElement* element = reinterpret_cast<FreeListElement*>(addr);
         size = element->Size();
         break;
       }
       default:
         OS::Print("Class Id: %d\n", class_id);
         UNREACHABLE();
         break;
     }
   } else {
-    RawClass* raw_class = Isolate::Current()->class_table()->At(class_id);
+    RawClass* raw_class = visitor->isolate()->class_table()->At(class_id);
     if (Class::IsSignatureClass(raw_class)) {
       RawClosure* raw_obj = reinterpret_cast<RawClosure*>(this);
       size = RawClosure::VisitClosurePointers(raw_obj, visitor);
     } else {
       RawInstance* raw_obj = reinterpret_cast<RawInstance*>(this);
       size = RawInstance::VisitInstancePointers(raw_obj, visitor);
     }
   }
 
   ASSERT(size != 0);
@@ skipping 276 matching lines @@
     RawUnwindError* raw_obj, ObjectPointerVisitor* visitor) {
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return UnwindError::InstanceSize();
 }
 
 
 intptr_t RawInstance::VisitInstancePointers(RawInstance* raw_obj,
                                             ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
-  RawClass* cls = Isolate::Current()->class_table()->At(raw_obj->GetClassId());
+  RawClass* cls = visitor->isolate()->class_table()->At(raw_obj->GetClassId());
   intptr_t instance_size = cls->ptr()->instance_size_;
   intptr_t num_native_fields = cls->ptr()->num_native_fields_;
 
   // Calculate the first and last raw object pointer fields.
   uword obj_addr = RawObject::ToAddr(raw_obj);
   uword from = obj_addr + sizeof(RawObject) + num_native_fields * kWordSize;
   uword to = obj_addr + instance_size - kWordSize;
   visitor->VisitPointers(reinterpret_cast<RawObject**>(from),
                          reinterpret_cast<RawObject**>(to));
   return instance_size;
@@ skipping 374 matching lines @@
 
 intptr_t RawWeakProperty::VisitWeakPropertyPointers(
     RawWeakProperty* raw_obj, ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return WeakProperty::InstanceSize();
 }
 
 }  // namespace dart