[heap] Move typed slot filtering logic into sweeper.

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 <deque>
 
 #include "src/base/bits.h"
@@ skipping 270 matching lines @@
 class MarkCompactCollector {
  public:
   class Evacuator;
 
   class Sweeper {
    public:
     class SweeperTask;
 
     enum FreeListRebuildingMode { REBUILD_FREE_LIST, IGNORE_FREE_LIST };
     enum FreeSpaceTreatmentMode { IGNORE_FREE_SPACE, ZAP_FREE_SPACE };
+    enum ClearOldToNewSlotsMode {
+      DO_NOT_CLEAR,
+      CLEAR_REGULAR_SLOTS,
+      CLEAR_TYPED_SLOTS
+    };
 
     typedef std::deque<Page*> SweepingList;
     typedef List<Page*> SweptList;
 
     static int RawSweep(Page* p, FreeListRebuildingMode free_list_mode,
                         FreeSpaceTreatmentMode free_space_mode);
 
     explicit Sweeper(Heap* heap)
         : heap_(heap),
           pending_sweeper_tasks_semaphore_(0),
@@ skipping 18 matching lines @@
     bool AreSweeperTasksRunning();
     bool IsSweepingCompleted(AllocationSpace space);
     void SweepOrWaitUntilSweepingCompleted(Page* page);
 
     void AddSweptPageSafe(PagedSpace* space, Page* page);
     Page* GetSweptPageSafe(PagedSpace* space);
 
    private:
     static const int kAllocationSpaces = LAST_PAGED_SPACE + 1;
 
+    static ClearOldToNewSlotsMode GetClearOldToNewSlotsMode(Page* p);
+
     template <typename Callback>
     void ForAllSweepingSpaces(Callback callback) {
       for (int i = 0; i < kAllocationSpaces; i++) {
         callback(static_cast<AllocationSpace>(i));
       }
     }
 
     Page* GetSweepingPageSafe(AllocationSpace space);
     void AddSweepingPageSafe(AllocationSpace space, Page* page);
 
@@ skipping 132 matching lines @@
       EnsureMarkingDequeIsCommitted(max_size);
       InitializeMarkingDeque();
     }
   }
 
   void EnsureMarkingDequeIsCommitted(size_t max_size);
   void EnsureMarkingDequeIsReserved();
 
   void InitializeMarkingDeque();
 
-  // The following two methods can just be called after marking, when the
-  // whole transitive closure is known. They must be called before sweeping
-  // when mark bits are still intact.
-  bool IsSlotInBlackObject(MemoryChunk* p, Address slot);
-  HeapObject* FindBlackObjectBySlotSlow(Address slot);
-
-  // Removes all the slots in the slot buffers that are within the given
-  // address range.
-  void RemoveObjectSlots(Address start_slot, Address end_slot);
-
   Sweeper& sweeper() { return sweeper_; }
 
  private:
   class EvacuateNewSpacePageVisitor;
   class EvacuateNewSpaceVisitor;
   class EvacuateOldSpaceVisitor;
   class EvacuateRecordOnlyVisitor;
   class EvacuateVisitorBase;
   class HeapObjectVisitor;
   class ObjectStatsVisitor;
@@ skipping 237 matching lines @@
 
  private:
   MarkCompactCollector* collector_;
 };
 
 V8_EXPORT_PRIVATE const char* AllocationSpaceName(AllocationSpace space);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_MARK_COMPACT_H_