ES6: Implement WeakSet

src/incremental-marking.cc

 // Copyright 2012 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 255 matching lines @@
 
   static void VisitNativeContextIncremental(Map* map, HeapObject* object) {
     Context* context = Context::cast(object);
 
     // We will mark cache black with a separate pass
     // when we finish marking.
     MarkObjectGreyDoNotEnqueue(context->normalized_map_cache());
     VisitNativeContext(map, context);
   }
 
-  static void VisitJSWeakMap(Map* map, HeapObject* object) {
+  static void VisitWeakCollection(Map* map, HeapObject* object) {
     Heap* heap = map->GetHeap();
     VisitPointers(heap,
-                  HeapObject::RawField(object, JSWeakMap::kPropertiesOffset),
-                  HeapObject::RawField(object, JSWeakMap::kSize));
+                  HeapObject::RawField(object,
+                                       WeakCollection::kPropertiesOffset),
+                  HeapObject::RawField(object, WeakCollection::kSize));
   }
 
   static void BeforeVisitingSharedFunctionInfo(HeapObject* object) {}
 
   INLINE(static void VisitPointer(Heap* heap, Object** p)) {
     Object* obj = *p;
     if (obj->NonFailureIsHeapObject()) {
       heap->mark_compact_collector()->RecordSlot(p, p, obj);
       MarkObject(heap, obj);
     }
@@ skipping 741 matching lines @@
   bytes_scanned_ = 0;
   write_barriers_invoked_since_last_step_ = 0;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSizeOfObjects();
 }
 
 } }  // namespace v8::internal