Simple BlinkGC heap compaction.

third_party/WebKit/Source/platform/heap/MarkingVisitorImpl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MarkingVisitorImpl_h
 #define MarkingVisitorImpl_h
 
 #include "platform/heap/Heap.h"
 #include "platform/heap/ThreadState.h"
 #include "platform/heap/Visitor.h"
@@ skipping 70 matching lines @@
     toDerived()->heap().registerWeakTable(
         const_cast<void*>(closure), iterationCallback, iterationDoneCallback);
   }
 
 #if ENABLE(ASSERT)
   inline bool weakTableRegistered(const void* closure) {
     return toDerived()->heap().weakTableRegistered(closure);
   }
 #endif
 
+  inline void registerMovingObjectReference(MovableReference* slot) {
+    if (toDerived()->getMarkingMode() != Visitor::GlobalMarkingWithCompaction)
+      return;
+    toDerived()->heap().registerMovingObjectReference(slot);
+  }
+
+  inline void registerMovingObjectCallback(MovableReference reference,
+                                           MovingObjectCallback callback,
+                                           void* callbackData) {
+    if (toDerived()->getMarkingMode() != Visitor::GlobalMarkingWithCompaction)
+      return;
+    toDerived()->heap().registerMovingObjectCallback(reference, callback,
+                                                     callbackData);
+  }
+
   inline bool ensureMarked(const void* objectPointer) {
     if (!objectPointer)
       return false;
     if (!toDerived()->shouldMarkObject(objectPointer))
       return false;
 #if ENABLE(ASSERT)
     if (HeapObjectHeader::fromPayload(objectPointer)->isMarked())
       return false;
 
     toDerived()->markNoTracing(objectPointer);
@@ skipping 20 matching lines @@
 
  private:
   static void markNoTracingCallback(Visitor* visitor, void* object) {
     visitor->markNoTracing(object);
   }
 };
 
 }  // namespace blink
 
 #endif