Filter out invalid slots in store buffer eagerly during object transition.

src/heap/store-buffer.h

Index: src/heap/store-buffer.h
diff --git a/src/heap/store-buffer.h b/src/heap/store-buffer.h
index 9670f62a8a9a1d55a96c374cab1ba7660710d5c2..babb745ac93828a513ef8dfa8d4eb16f15dca3d1 100644
--- a/src/heap/store-buffer.h
+++ b/src/heap/store-buffer.h
@@ -36,6 +36,8 @@ class StoreBuffer {
   // This is used to add addresses to the store buffer non-concurrently.
   inline void Mark(Address addr);
 
+  void Remove(Address addr);

[Hannes Payer (out of office), 2016/02/08 21:17:25]

For completeness, leave a comment.

[ulan, 2016/02/09 10:14:49]

Done.

+
   // Slots that do not point to the ToSpace after callback invocation will be
   // removed from the set.
   void IteratePointersToNewSpace(ObjectSlotCallback callback);