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

runtime/vm/gc_marker.cc

Index: runtime/vm/gc_marker.cc
===================================================================
--- runtime/vm/gc_marker.cc	(revision 22083)
+++ runtime/vm/gc_marker.cc	(working copy)
@@ -175,6 +175,7 @@
     ASSERT(!raw_obj->IsMarked());
     RawClass* raw_class = isolate()->class_table()->At(raw_obj->GetClassId());
     raw_obj->SetMarkBit();
+    raw_obj->ClearRememberedBit();
     if (raw_obj->IsWatched()) {
       std::pair<DelaySet::iterator, DelaySet::iterator> ret;
       // Visit all elements with a key equal to raw_obj.
@@ -201,8 +202,10 @@
     // Skip over new objects, but verify consistency of heap while at it.
     if (raw_obj->IsNewObject()) {
       // TODO(iposva): Add consistency check.
-      if (visiting_old_object_ != NULL) {
+      if ((visiting_old_object_ != NULL) &&
+          !visiting_old_object_->IsRemembered()) {
         ASSERT(p != NULL);
+        visiting_old_object_->SetRememberedBit();
         isolate()->store_buffer()->AddPointer(
             reinterpret_cast<uword>(visiting_old_object_));
       }