Support slots recording for compaction during incremental marking.

src/incremental-marking.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 92 matching lines @@
       if (FLAG_trace_incremental_marking) {
         PrintF("[IncrementalMarking] Restarting (new grey objects)\n");
       }
     }
   }
 
   static void RecordWriteFromCode(HeapObject* obj,
                                   Object* value,
                                   Isolate* isolate);
 
-  inline void RecordWrite(HeapObject* obj, Object* value);
+  static void RecordWriteForEvacuationFromCode(HeapObject* obj,
+                                               Object** slot,
+                                               Isolate* isolate);
+
+  inline void RecordWrite(HeapObject* obj, Object** slot, Object* value);
   inline void RecordWriteOf(HeapObject* value);
   inline void RecordWrites(HeapObject* obj);
 
   inline void BlackToGreyAndUnshift(HeapObject* obj, MarkBit mark_bit);
 
   inline void WhiteToGreyAndPush(HeapObject* obj, MarkBit mark_bit);
 
   inline void WhiteToGrey(HeapObject* obj, MarkBit mark_bit);
 
   // Does white->black or grey->grey
@@ skipping 61 matching lines @@
   void DeactivateIncrementalWriteBarrier();
 
   static void SetOldSpacePageFlags(MemoryChunk* chunk, bool is_marking);
   static void SetNewSpacePageFlags(NewSpacePage* chunk, bool is_marking);
 
   void EnsureMarkingDequeIsCommitted();
 
   Heap* heap_;
 
   State state_;
+  bool is_compacting_;
 
   VirtualMemory* marking_deque_memory_;
   MarkingDeque marking_deque_;
 
   int steps_count_;
   double steps_took_;
   int steps_count_since_last_gc_;
   double steps_took_since_last_gc_;
   bool should_hurry_;
   int allocation_marking_factor_;
   intptr_t allocated_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_INCREMENTAL_MARKING_H_