Forward transition objects to grey if they are referenced by a large object

src/incremental-marking-inl.h

Index: src/incremental-marking-inl.h
diff --git a/src/incremental-marking-inl.h b/src/incremental-marking-inl.h
index bbe9a9d209b36cca76360b2f9b091b755dc0587a..3a62bfecce9032733391213e5dd3b6f8f7471c88 100644
--- a/src/incremental-marking-inl.h
+++ b/src/incremental-marking-inl.h
@@ -37,16 +37,24 @@ namespace internal {
 bool IncrementalMarking::BaseRecordWrite(HeapObject* obj,
                                          Object** slot,
                                          Object* value) {
-  MarkBit value_bit = Marking::MarkBitFrom(HeapObject::cast(value));
+  HeapObject* value_heap_obj = HeapObject::cast(value);
+  MarkBit value_bit = Marking::MarkBitFrom(value_heap_obj);
   if (Marking::IsWhite(value_bit)) {
     MarkBit obj_bit = Marking::MarkBitFrom(obj);
-    if (Marking::IsBlack(obj_bit)) {
-      BlackToGreyAndUnshift(obj, obj_bit);
-      RestartIfNotMarking();
+    bool is_black = Marking::IsBlack(obj_bit);
+    if (is_black) {

[Michael Starzinger, 2012/11/18 22:07:02]

Move the "Marking::IsBlack(obj_bit)" into the if condition.

[Hannes Payer (out of office), 2012/11/19 10:56:20]

Done.

+      MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
+      if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) {
+        WhiteToGreyAndPush(value_heap_obj, value_bit);
+        RestartIfNotMarking();
+      } else {
+        BlackToGreyAndUnshift(obj, obj_bit);
+        RestartIfNotMarking();
+        return false;
+      }
+    } else {
+      return false;
     }
-
-    // Object is either grey or white.  It will be scanned if survives.
-    return false;
   }
   if (!is_compacting_) return false;
   MarkBit obj_bit = Marking::MarkBitFrom(obj);