Simple BlinkGC heap compaction.

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

 // Copyright 2015 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 MarkingVisitor_h
 #define MarkingVisitor_h
 
 #include "platform/heap/MarkingVisitorImpl.h"
 
 namespace blink {
 
 template <Visitor::MarkingMode Mode>
 class MarkingVisitor final : public Visitor,
                              public MarkingVisitorImpl<MarkingVisitor<Mode>> {
  public:
   using Impl = MarkingVisitorImpl<MarkingVisitor<Mode>>;
   friend class MarkingVisitorImpl<MarkingVisitor<Mode>>;
 
   explicit MarkingVisitor(ThreadState* state) : Visitor(state, Mode) {}
 
   void markHeader(HeapObjectHeader* header, TraceCallback callback) override {
     Impl::markHeader(header, header->payload(), callback);
   }
 
   void mark(const void* objectPointer, TraceCallback callback) override {
     Impl::mark(objectPointer, callback);
   }
 
-  void registerDelayedMarkNoTracing(const void* object) override {
+  void registerDelayedMarkNoTracing(void** object) override {
     Impl::registerDelayedMarkNoTracing(object);
   }
 
   void registerWeakMembers(const void* closure,
                            const void* objectPointer,
                            WeakCallback callback) override {
     Impl::registerWeakMembers(closure, objectPointer, callback);
   }
 
   virtual void registerWeakTable(const void* closure,
                                  EphemeronCallback iterationCallback,
                                  EphemeronCallback iterationDoneCallback) {
     Impl::registerWeakTable(closure, iterationCallback, iterationDoneCallback);
   }
 
 #if ENABLE(ASSERT)
   virtual bool weakTableRegistered(const void* closure) {
     return Impl::weakTableRegistered(closure);
   }
 #endif
 
+  void registerMovingObjectReference(MovableReference* slot) override {
+    Impl::registerMovingObjectReference(slot);
+  }
+
+  void registerMovingObjectCallback(MovableReference backingStore,
+                                    MovingObjectCallback callback,
+                                    void* callbackData) override {
+    Impl::registerMovingObjectCallback(backingStore, callback, callbackData);
+  }
+
   bool ensureMarked(const void* objectPointer) override {
     return Impl::ensureMarked(objectPointer);
   }
 
   void registerWeakCellWithCallback(void** cell,
                                     WeakCallback callback) override {
     Impl::registerWeakCellWithCallback(cell, callback);
   }
 
  protected:
   inline bool shouldMarkObject(const void* objectPointer) const {
     if (Mode != ThreadLocalMarking)
       return true;
 
     BasePage* page = pageFromObject(objectPointer);
     ASSERT(!page->orphaned());
     // When doing a thread local GC, the marker checks if
     // the object resides in another thread's heap. If it
     // does, the object should not be marked & traced.
     return page->terminating();
   }
 };
 
 }  // namespace blink
 
 #endif