Forward white to grey transition only if slot is before the progress bar of a given object.

src/spaces.h

Index: src/spaces.h
diff --git a/src/spaces.h b/src/spaces.h
index 4fbabd6349d43364e9fe387c3ad0352e6ed42462..3eb65b9c120a5878e00dd98f69f1580a16a3c874 100644
--- a/src/spaces.h
+++ b/src/spaces.h
@@ -503,6 +503,11 @@ class MemoryChunk {
     }
   }
 
+  bool IsLeftOfProgressBar(Object** slot) {
+    ASSERT(reinterpret_cast<Address>(slot) > reinterpret_cast<Address>(this));
+    return reinterpret_cast<Address>(slot) - (reinterpret_cast<Address>(this) +

[Michael Starzinger, 2012/11/26 15:10:26]

Used the address() helper instead of "reinterpret_cast<Address>(this)".

Also if you pull out the cast of slot to Address the code will be easier to read
and the condition will fit into one line.

[Hannes Payer (out of office), 2012/11/26 16:14:35]

Done.

+        kObjectStartOffset) < progress_bar();
+  }
 
   static void IncrementLiveBytesFromGC(Address address, int by) {
     MemoryChunk::FromAddress(address)->IncrementLiveBytes(by);