Refactor how embedded pointers are visited.

src/mark-compact.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 297 matching lines @@
 
   ~SlotsBuffer() {
   }
 
   void Add(ObjectSlot slot) {
     ASSERT(0 <= idx_ && idx_ < kNumberOfElements);
     slots_[idx_++] = slot;
   }
 
   enum SlotType {
+    EMBEDDED_OBJECT_SLOT,
     RELOCATED_CODE_OBJECT,
     CODE_TARGET_SLOT,
     CODE_ENTRY_SLOT,
     DEBUG_TARGET_SLOT,
     JS_RETURN_SLOT,
     NUMBER_OF_SLOT_TYPES
   };
 
   void UpdateSlots(Heap* heap);
 
@@ skipping 203 matching lines @@
     // to other evacuation candidates thus we have to
     // rescan the page after evacuation to discover and update all
     // pointers to evacuated objects.
     if (page->owner()->identity() == OLD_DATA_SPACE) {
       evacuation_candidates_.RemoveElement(page);
     } else {
       page->SetFlag(Page::RESCAN_ON_EVACUATION);
     }
   }
 
-  void RecordRelocSlot(RelocInfo* rinfo, Code* target);
+  void RecordRelocSlot(RelocInfo* rinfo, Object* target);
   void RecordCodeEntrySlot(Address slot, Code* target);
 
   INLINE(void RecordSlot(Object** anchor_slot, Object** slot, Object* object));
 
   void MigrateObject(Address dst,
                      Address src,
                      int size,
                      AllocationSpace to_old_space);
 
   bool TryPromoteObject(HeapObject* object, int object_size);
@@ skipping 232 matching lines @@
 
   friend class Heap;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_