Speed up debug mode GC.

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 651 matching lines @@
   void RefillMarkingDeque();
 
   // After reachable maps have been marked process per context object
   // literal map caches removing unmarked entries.
   void ProcessMapCaches();
 
   // Callback function for telling whether the object *p is an unmarked
   // heap object.
   static bool IsUnmarkedHeapObject(Object** p);
 
-#ifdef DEBUG
-  void UpdateLiveObjectCount(HeapObject* obj);
-#endif
-
   // Map transitions from a live map to a dead map must be killed.
   // We replace them with a null descriptor, with the same key.
   void ClearNonLiveTransitions();
 
   // Marking detaches initial maps from SharedFunctionInfo objects
   // to make this reference weak. We need to reattach initial maps
   // back after collection. This is either done during
   // ClearNonLiveTransitions pass or by calling this function.
   void ReattachInitialMaps();
 
@@ skipping 27 matching lines @@
 
   void EvacuateLiveObjectsFromPage(Page* p);
 
   void EvacuatePages();
 
   void EvacuateNewSpaceAndCandidates();
 
   void SweepSpace(PagedSpace* space, SweeperType sweeper);
 
 #ifdef DEBUG
-  // -----------------------------------------------------------------------
-  // Debugging variables, functions and classes
-  // Counters used for debugging the marking phase of mark-compact or
-  // mark-sweep collection.
-
-  // Size of live objects in Heap::to_space_.
-  int live_young_objects_size_;
-
-  // Size of live objects in Heap::old_pointer_space_.
-  int live_old_pointer_objects_size_;
-
-  // Size of live objects in Heap::old_data_space_.
-  int live_old_data_objects_size_;
-
-  // Size of live objects in Heap::code_space_.
-  int live_code_objects_size_;
-
-  // Size of live objects in Heap::map_space_.
-  int live_map_objects_size_;
-
-  // Size of live objects in Heap::cell_space_.
-  int live_cell_objects_size_;
-
-  // Size of live objects in Heap::lo_space_.
-  int live_lo_objects_size_;
-
-  // Number of live bytes in this collection.
-  int live_bytes_;
-
   friend class MarkObjectVisitor;
   static void VisitObject(HeapObject* obj);
 
   friend class UnmarkObjectVisitor;
   static void UnmarkObject(HeapObject* obj);
 #endif
 
   Heap* heap_;
   MarkingDeque marking_deque_;
   CodeFlusher* code_flusher_;
   Object* encountered_weak_maps_;
 
   List<Page*> evacuation_candidates_;
   List<Code*> invalidated_code_;
 
   friend class Heap;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_