[heap] Black allocation.

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index cc5449f97765e7d1a6c2993b963ff569edc2df89..b36092b78bbb3205e2a59e0024b08dbff7831c58 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -160,6 +160,8 @@ class Marking : public AllStatic {
 
   // Returns true if the transferred color is black.
   INLINE(static bool TransferColor(HeapObject* from, HeapObject* to)) {
+    if (Page::FromAddress(to->address())->IsFlagSet(Page::BLACK_PAGE))

[Michael Lippautz, 2016/02/04 17:59:51]

Why are you not transferring the markbit here (although you return true).

[Hannes Payer (out of office), 2016/02/06 08:50:16]

Because to lives on a black page. It will always be black.

+      return true;
     MarkBit from_mark_bit = MarkBitFrom(from);
     MarkBit to_mark_bit = MarkBitFrom(to);
     DCHECK(Marking::IsWhite(to_mark_bit));
@@ -806,6 +808,8 @@ class MarkCompactCollector {
   // Semaphore used to synchronize compaction tasks.
   base::Semaphore pending_compaction_tasks_semaphore_;
 
+  bool black_allocation_;
+
   friend class Heap;
   friend class StoreBuffer;
 };