Simple non-incremental compaction by evacuation.

src/store-buffer.h

Index: src/store-buffer.h
diff --git a/src/store-buffer.h b/src/store-buffer.h
index ece54f3f7cd5de7568ecc090c4b7d038dd54028c..21d084a22f8b0d057ff6ea0e385069cb0b661a1a 100644
--- a/src/store-buffer.h
+++ b/src/store-buffer.h
@@ -76,10 +76,17 @@ class StoreBuffer {
   // callback set up with the StoreBufferRebuildScope object.
   inline void EnterDirectlyIntoStoreBuffer(Address addr);
 
+
+  enum IterationMode {
+    SKIP_SLOTS_IN_EVACUATION_CANDIDATES,
+    VISIT_ALL_SLOTS
+  };
+
   // Iterates over all pointers that go from old space to new space.  It will
   // delete the store buffer as it starts so the callback should reenter
   // surviving old-to-new pointers into the store buffer to rebuild it.
-  void IteratePointersToNewSpace(ObjectSlotCallback callback);
+  void IteratePointersToNewSpace(ObjectSlotCallback callback,
+                                 IterationMode mode);
 
   static const int kStoreBufferOverflowBit = 1 << 16;
   static const int kStoreBufferSize = kStoreBufferOverflowBit;
@@ -184,6 +191,10 @@ class StoreBuffer {
     RegionCallback region_callback,
     ObjectSlotCallback slot_callback);
 
+  template<StoreBuffer::IterationMode mode>
+  void IteratePointersInStoreBuffer(ObjectSlotCallback slot_callback);
+
+
 #ifdef DEBUG
   void VerifyPointers(PagedSpace* space, RegionCallback region_callback);
   void VerifyPointers(LargeObjectSpace* space);