[heap] Pause black allocation during GCs

src/heap/spaces.h

 // Copyright 2011 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_SPACES_H_
 #define V8_HEAP_SPACES_H_
 
 #include <list>
 #include <memory>
 #include <unordered_set>
@@ skipping 802 matching lines @@
   }
   void remove_available_in_free_list(size_t available) {
     DCHECK_LE(available, area_size());
     DCHECK_GE(available_in_free_list(), available);
     available_in_free_list_.Decrement(available);
   }
 
   size_t ShrinkToHighWaterMark();
 
   V8_EXPORT_PRIVATE void CreateBlackArea(Address start, Address end);
+  void DestroyBlackArea(Address start, Address end);
 
 #ifdef DEBUG
   void Print();
 #endif  // DEBUG
 
  private:
   enum InitializationMode { kFreeMemory, kDoNotFreeMemory };
 
   template <InitializationMode mode = kFreeMemory>
   static inline Page* Initialize(Heap* heap, MemoryChunk* chunk,
@@ skipping 1236 matching lines @@
     MemoryChunk::UpdateHighWaterMark(allocation_info_.top());
     allocation_info_.Reset(top, limit);
   }
 
   void SetAllocationInfo(Address top, Address limit);
 
   // Empty space allocation info, returning unused area to free list.
   void EmptyAllocationInfo();
 
   void MarkAllocationInfoBlack();
+  void UnmarkAllocationInfo();
 
   void AccountAllocatedBytes(size_t bytes) {
     accounting_stats_.AllocateBytes(bytes);
   }
 
   void IncreaseCapacity(size_t bytes);
 
   // Releases an unused page and shrinks the space.
   void ReleasePage(Page* page);
 
@@ skipping 864 matching lines @@
   PageIterator old_iterator_;
   PageIterator code_iterator_;
   PageIterator map_iterator_;
   LargePageIterator lo_iterator_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SPACES_H_