- Remember the fact that an object has been added to the

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 422 matching lines @@
     uword this_addr = RawObject::ToAddr(raw());
     return (addr >= this_addr) && (addr < (this_addr + this_size));
   }
 
   template<typename type> void StorePointer(type* addr, type value) const {
     // Ensure that this object contains the addr.
     ASSERT(Contains(reinterpret_cast<uword>(addr)));
     *addr = value;
     // Filter stores based on source and target.
     if (!value->IsHeapObject()) return;
-    if (value->IsNewObject() && raw()->IsOldObject()) {
+    if (value->IsNewObject() && raw()->IsOldObject() &&
+        !raw()->IsRemembered()) {
+      raw()->SetRememberedBit();
       uword ptr = reinterpret_cast<uword>(raw());
       Isolate::Current()->store_buffer()->AddPointer(ptr);
     }
   }
 
   RawObject* raw_;  // The raw object reference.
 
  private:
   static void InitializeObject(uword address, intptr_t id, intptr_t size);
 
@@ skipping 4502 matching lines @@
     intptr_t data_size = data()->Size();
     uword data_addr = RawObject::ToAddr(data());
     return (addr >= data_addr) && (addr < (data_addr + data_size));
   }
   void DataStorePointer(RawObject** addr, RawObject* value) const {
     // Ensure that the backing array object contains the addr.
     ASSERT(DataContains(reinterpret_cast<uword>(addr)));
     *addr = value;
     // Filter stores based on source and target.
     if (!value->IsHeapObject()) return;
-    if (value->IsNewObject() && data()->IsOldObject()) {
+    if (value->IsNewObject() && data()->IsOldObject() &&
+        !data()->IsRemembered()) {
+      data()->SetRememberedBit();
       uword ptr = reinterpret_cast<uword>(data());
       Isolate::Current()->store_buffer()->AddPointer(ptr);
     }
   }
 
   static const int kDefaultInitialCapacity = 4;
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(GrowableObjectArray, Instance);
   friend class Array;
   friend class Class;
@@ skipping 734 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_