[heap] Add optimized RecordWrites

src/heap/heap.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_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 1060 matching lines @@
   void IteratePromotedObjectPointers(HeapObject* object, Address start,
                                      Address end, bool record_slots,
                                      ObjectSlotCallback callback);
 
   // ===========================================================================
   // Store buffer API. =========================================================
   // ===========================================================================
 
   // Write barrier support for object[offset] = o;
   inline void RecordWrite(Object* object, int offset, Object* o);
+  inline void RecordWrites(FixedArray* array, int offset, int length);

[Hannes Payer (out of office), 2016/04/01 11:34:40]

Let's call it RecordFixedArrayElements.

 
   Address* store_buffer_top_address() {
     return reinterpret_cast<Address*>(&roots_[kStoreBufferTopRootIndex]);
   }
 
   void ClearRecordedSlot(HeapObject* object, Object** slot);
   void ClearRecordedSlotRange(Address start, Address end);
 
   // ===========================================================================
   // Incremental marking API. ==================================================
@@ skipping 1563 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_