Immediatelly promote marked objects

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index f9c9235320b25df45a116cd08fd04fe7b4692451..9ac05590c8ababfa31357354a3fc2bfa6bcd417e 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -393,10 +393,18 @@ bool Heap::OldGenerationAllocationLimitReached() {
   return OldGenerationSpaceAvailable() < 0;
 }
 
-
+template <MarksHandling marks_handling>
 bool Heap::ShouldBePromoted(Address old_address, int object_size) {
   Page* page = Page::FromAddress(old_address);
   Address age_mark = new_space_.age_mark();
+
+  if (marks_handling == TRANSFER_MARKS) {

[Michael Lippautz, 2016/05/24 11:54:51]

TRANSFER_MARKS is a confusing name for this one as we don't actually transfer
the marks but rather consider them when deciding whether to promote or not.

Maybe have a separate enum and call this one PROMOTE_MARKED?

+    MarkBit mark_bit = Marking::MarkBitFrom(old_address);
+    if (!Marking::IsWhite(mark_bit)) {
+      return true;
+    }
+  }
+
   return page->IsFlagSet(MemoryChunk::NEW_SPACE_BELOW_AGE_MARK) &&
          (!page->ContainsLimit(age_mark) || old_address < age_mark);
 }