Change RecordSlot interface. Make it more robust by replacing anchor slot with actual object.

src/heap/mark-compact.h

 // Copyright 2012 the V8 project 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 V8_HEAP_MARK_COMPACT_H_
 #define V8_HEAP_MARK_COMPACT_H_
 
 #include "src/base/bits.h"
 #include "src/heap/spaces.h"
 
@@ skipping 622 matching lines @@
   enum SweepingParallelism { SWEEP_ON_MAIN_THREAD, SWEEP_IN_PARALLEL };
 
 #ifdef VERIFY_HEAP
   void VerifyMarkbitsAreClean();
   static void VerifyMarkbitsAreClean(PagedSpace* space);
   static void VerifyMarkbitsAreClean(NewSpace* space);
   void VerifyWeakEmbeddedObjectsInCode();
   void VerifyOmittedMapChecks();
 #endif
 
-  INLINE(static bool ShouldSkipEvacuationSlotRecording(Object** anchor)) {
-    return Page::FromAddress(reinterpret_cast<Address>(anchor))
-        ->ShouldSkipEvacuationSlotRecording();
-  }
-
   INLINE(static bool ShouldSkipEvacuationSlotRecording(Object* host)) {
     return Page::FromAddress(reinterpret_cast<Address>(host))
         ->ShouldSkipEvacuationSlotRecording();
   }
 
   INLINE(static bool IsOnEvacuationCandidate(Object* obj)) {
     return Page::FromAddress(reinterpret_cast<Address>(obj))
         ->IsEvacuationCandidate();
   }
 
   void RecordRelocSlot(RelocInfo* rinfo, Object* target);
-  void RecordCodeEntrySlot(Address slot, Code* target);
+  void RecordCodeEntrySlot(HeapObject* object, Address slot, Code* target);
   void RecordCodeTargetPatch(Address pc, Code* target);
 
   INLINE(void RecordSlot(
-      Object** anchor_slot, Object** slot, Object* object,
+      HeapObject* object, Object** slot, Object* target,
       SlotsBuffer::AdditionMode mode = SlotsBuffer::FAIL_ON_OVERFLOW));
 
   void MigrateObject(HeapObject* dst, HeapObject* src, int size,
                      AllocationSpace to_old_space);
 
   void MigrateObjectTagged(HeapObject* dst, HeapObject* src, int size);
   void MigrateObjectMixed(HeapObject* dst, HeapObject* src, int size);
   void MigrateObjectRaw(HeapObject* dst, HeapObject* src, int size);
 
   bool TryPromoteObject(HeapObject* object, int object_size);
@@ skipping 366 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_H_