[heap] Provide ObjectMarking with marking transitions

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 9952b7953dfb154e73e81eccfb4e260a04a3e98b..c40989596c9939027ef7189e2ae18ecd41a1e46a 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -46,6 +46,76 @@ class ObjectMarking : public AllStatic {
     return Marking::Color(ObjectMarking::MarkBitFrom(obj));
   }
 
+  V8_INLINE static bool IsImpossible(HeapObject* obj) {
+    return Marking::IsImpossible(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static bool IsBlack(HeapObject* obj) {
+    return Marking::IsBlack(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static bool IsWhite(HeapObject* obj) {
+    return Marking::IsWhite(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static bool IsGrey(HeapObject* obj) {
+    return Marking::IsGrey(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static bool IsBlackOrGrey(HeapObject* obj) {
+    return Marking::IsBlackOrGrey(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static void ClearMarkBit(HeapObject* obj) {
+    Marking::MarkWhite(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static void BlackToWhite(HeapObject* obj) {
+    DCHECK(IsBlack(obj));
+    MarkBit markbit = MarkBitFrom(obj);
+    Marking::BlackToWhite(markbit);
+    MemoryChunk::IncrementLiveBytes(obj, -obj->Size());
+  }
+
+  V8_INLINE static void GreyToWhite(HeapObject* obj) {
+    DCHECK(IsGrey(obj));
+    Marking::GreyToWhite(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static void BlackToGrey(HeapObject* obj) {
+    DCHECK(IsBlack(obj));
+    MarkBit markbit = MarkBitFrom(obj);
+    Marking::BlackToGrey(markbit);
+    MemoryChunk::IncrementLiveBytes(obj, -obj->Size());
+  }
+
+  V8_INLINE static void WhiteToGrey(HeapObject* obj) {
+    DCHECK(IsWhite(obj));
+    Marking::WhiteToGrey(MarkBitFrom(obj));
+  }
+
+  V8_INLINE static void WhiteToBlack(HeapObject* obj) {
+    DCHECK(IsWhite(obj));
+    MarkBit markbit = MarkBitFrom(obj);
+    Marking::WhiteToBlack(markbit);
+    MemoryChunk::IncrementLiveBytes(obj, obj->Size());
+  }
+
+  V8_INLINE static void GreyToBlack(HeapObject* obj) {
+    DCHECK(IsGrey(obj));
+    MarkBit markbit = MarkBitFrom(obj);
+    Marking::GreyToBlack(markbit);
+    MemoryChunk::IncrementLiveBytes(obj, obj->Size());
+  }
+
+  V8_INLINE static void AnyToGrey(HeapObject* obj) {
+    MarkBit markbit = MarkBitFrom(obj);
+    if (Marking::IsBlack(markbit)) {
+      MemoryChunk::IncrementLiveBytes(obj, -obj->Size());
+    }
+    Marking::AnyToGrey(markbit);
+  }
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ObjectMarking);
 };
@@ -595,7 +665,7 @@ class MarkCompactCollector {
 
   // Marks the object black assuming that it is not yet marked.
   // This is for non-incremental marking only.
-  INLINE(void SetMark(HeapObject* obj, MarkBit mark_bit));
+  INLINE(void SetMark(HeapObject* obj));
 
   // Mark the heap roots and all objects reachable from them.
   void MarkRoots(RootMarkingVisitor<MarkCompactMode::FULL>* visitor);