Set object tags directly to the entry name in heap profiler.

src/profile-generator.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 1692 matching lines @@
                         ? collection_->names()->GetName(String::cast(name))
                         : "");
   } else if (object->IsGlobalContext()) {
     return AddEntry(object, HeapEntry::kHidden, "system / GlobalContext");
   } else if (object->IsContext()) {
     return AddEntry(object, HeapEntry::kHidden, "system / Context");
   } else if (object->IsFixedArray() ||
              object->IsFixedDoubleArray() ||
              object->IsByteArray() ||
              object->IsExternalArray()) {
-    const char* tag = objects_tags_.GetTag(object);
-    return AddEntry(object, HeapEntry::kArray, tag != NULL ? tag : "");
+    return AddEntry(object, HeapEntry::kArray, "");
   } else if (object->IsHeapNumber()) {
     return AddEntry(object, HeapEntry::kHeapNumber, "number");
   }
   return AddEntry(object, HeapEntry::kHidden, GetSystemEntryName(object));
 }
 
 
 HeapEntry* V8HeapExplorer::AddEntry(HeapObject* object,
                                     HeapEntry::Type type,
                                     const char* name) {
@@ skipping 903 matching lines @@
 #undef SYMBOL_NAME
 #undef NAME_ENTRY
     CHECK(!strong_gc_subroot_names_.is_empty());
   }
   return strong_gc_subroot_names_.GetTag(object);
 }
 
 
 void V8HeapExplorer::TagObject(Object* obj, const char* tag) {
   if (IsEssentialObject(obj)) {
-    objects_tags_.SetTag(obj, tag);
+    HeapEntry* entry = GetEntry(obj);
+    if (entry->name()[0] == '\0') {
+      entry->set_name(tag);
+    }
   }
 }
 
 
 class GlobalObjectsEnumerator : public ObjectVisitor {
  public:
   virtual void VisitPointers(Object** start, Object** end) {
     for (Object** p = start; p < end; p++) {
       if ((*p)->IsGlobalContext()) {
         Context* context = Context::cast(*p);
@@ skipping 1104 matching lines @@
 
 
 void HeapSnapshotJSONSerializer::SortHashMap(
     HashMap* map, List<HashMap::Entry*>* sorted_entries) {
   for (HashMap::Entry* p = map->Start(); p != NULL; p = map->Next(p))
     sorted_entries->Add(p);
   sorted_entries->Sort(SortUsingEntryValue);
 }
 
 } }  // namespace v8::internal