Immediatelly promote marked objects

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 284 matching lines @@
 class HeapStats;
 class HistogramTimer;
 class Isolate;
 class MemoryReducer;
 class ObjectStats;
 class Scavenger;
 class ScavengeJob;
 class WeakObjectRetainer;
 
 enum PromotionMode { FORCE_PROMOTION, DEFAULT_PROMOTION };
+enum MarksHandling { TRANSFER_MARKS, IGNORE_MARKS };
 
 typedef void (*ObjectSlotCallback)(HeapObject** from, HeapObject* to,
                                    PromotionMode mode);
 
 // A queue of objects promoted during scavenge. Each object is accompanied
 // by it's size to avoid dereferencing a map pointer for scanning.
 // The last page in to-space is used for the promotion queue. On conflict
 // during scavenge, the promotion queue is allocated externally and all
 // entries are copied to the external queue.
 class PromotionQueue {
@@ skipping 455 matching lines @@
 
     if (HighMemoryPressure()) return true;
 
     return false;
   }
 
   void VisitExternalResources(v8::ExternalResourceVisitor* visitor);
 
   // An object should be promoted if the object has survived a
   // scavenge operation.
+  template <MarksHandling marks_handling>
   inline bool ShouldBePromoted(Address old_address, int object_size);
 
   void ClearNormalizedMapCaches();
 
   void IncrementDeferredCount(v8::Isolate::UseCounterFeature feature);
 
   inline bool OldGenerationAllocationLimitReached();
 
   // Completely clear the Instanceof cache (to stop it keeping objects alive
   // around a GC).
@@ skipping 1872 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_