Make a single HeapEntry per single JSArrayBuffer data in heap snapshot.

src/heap-snapshot-generator.cc

 // Copyright 2013 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 1438 matching lines @@
                        AllocationSite::kNestedSiteOffset);
   SetInternalReference(site, entry, "dependent_code", site->dependent_code(),
                        AllocationSite::kDependentCodeOffset);
   // Do not visit weak_next as it is not visited by the StaticVisitor,
   // and we're not very interested in weak_next field here.
   STATIC_CHECK(AllocationSite::kWeakNextOffset >=
                AllocationSite::BodyDescriptor::kEndOffset);
 }
 
 
+class JSArrayBufferDataEntryAllocator : public HeapEntriesAllocator {
+ public:
+  JSArrayBufferDataEntryAllocator(int size, V8HeapExplorer* explorer)
+      : size_(size)
+      , explorer_(explorer) {
+  }
+  virtual HeapEntry* AllocateEntry(HeapThing ptr) {
+    return explorer_->AddEntry(
+        static_cast<Address>(ptr),
+        HeapEntry::kNative, "system / JSArrayBufferData", size_);
+  }
+ private:
+  int size_;
+  V8HeapExplorer* explorer_;
+};
+
+
 void V8HeapExplorer::ExtractJSArrayBufferReferences(
     int entry, JSArrayBuffer* buffer) {
   SetWeakReference(buffer, entry, "weak_next", buffer->weak_next(),
                    JSArrayBuffer::kWeakNextOffset);
   SetWeakReference(buffer, entry,
                    "weak_first_view", buffer->weak_first_view(),
                    JSArrayBuffer::kWeakFirstViewOffset);
   // Setup a reference to a native memory backing_store object.
   if (!buffer->backing_store())
     return;
   size_t data_size = NumberToSize(heap_->isolate(), buffer->byte_length());
   CHECK(data_size <= static_cast<size_t>(kMaxInt));
-  HeapEntry* data_entry = AddEntry(
-      static_cast<Address>(buffer->backing_store()),
-      HeapEntry::kNative, "system / ArrayBufferData",
-      static_cast<int>(data_size));
+  JSArrayBufferDataEntryAllocator allocator(static_cast<int>(data_size), this);
+  HeapEntry* data_entry =
+      filler_->FindOrAddEntry(buffer->backing_store(), &allocator);
   filler_->SetNamedReference(HeapGraphEdge::kInternal,
                              entry, "backing_store", data_entry);
 }
 
 
 void V8HeapExplorer::ExtractClosureReferences(JSObject* js_obj, int entry) {
   if (!js_obj->IsJSFunction()) return;
 
   JSFunction* func = JSFunction::cast(js_obj);
   if (func->shared()->bound()) {
@@ skipping 1538 matching lines @@
   writer_->AddString("\"<dummy>\"");
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 } }  // namespace v8::internal