- Remember objects (not addresses) in the old generation containing new pointers.

runtime/vm/store_buffer.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/store_buffer.h"
 
 #include "platform/assert.h"
 #include "vm/runtime_entry.h"
 
 namespace dart {
@@ skipping 46 matching lines @@
     DedupSet* next = current->next();
     delete current;
     current = next;
   }
 }
 
 
 void StoreBuffer::AddPointer(uword address) {
   ASSERT(dedup_sets_ != NULL);
   ASSERT(Isolate::Current()->heap()->OldContains(address));
+  ASSERT((address & kSmiTagMask) != kSmiTag);
   if (!dedup_sets_->set()->Add(address)) {
     // Add a new DedupSet. Schedule an interrupt if we have run over the max
     // number of DedupSets.
     dedup_sets_ = new DedupSet(dedup_sets_);
     count_++;
     // TODO(iposva): Fix magic number.
     if (count_ > 100) {
       Isolate::Current()->ScheduleInterrupts(Isolate::kStoreBufferInterrupt);
     }
   }
 }
 
 }  // namespace dart