Change the type of system root nodes in heap snapshot to kSynthetic

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 220 matching lines @@
 
 
 void HeapSnapshot::RememberLastJSObjectId() {
   max_snapshot_js_object_id_ = collection_->last_assigned_id();
 }
 
 
 HeapEntry* HeapSnapshot::AddRootEntry() {
   ASSERT(root_index_ == HeapEntry::kNoEntry);
   ASSERT(entries_.is_empty());  // Root entry must be the first one.
-  HeapEntry* entry = AddEntry(HeapEntry::kObject,
+  HeapEntry* entry = AddEntry(HeapEntry::kSynthetic,
                               "",
                               HeapObjectsMap::kInternalRootObjectId,
                               0);
   root_index_ = entry->index();
   ASSERT(root_index_ == 0);
   return entry;
 }
 
 
 HeapEntry* HeapSnapshot::AddGcRootsEntry() {
   ASSERT(gc_roots_index_ == HeapEntry::kNoEntry);
-  HeapEntry* entry = AddEntry(HeapEntry::kObject,
+  HeapEntry* entry = AddEntry(HeapEntry::kSynthetic,
                               "(GC roots)",
                               HeapObjectsMap::kGcRootsObjectId,
                               0);
   gc_roots_index_ = entry->index();
   return entry;
 }
 
 
 HeapEntry* HeapSnapshot::AddGcSubrootEntry(int tag) {
   ASSERT(gc_subroot_indexes_[tag] == HeapEntry::kNoEntry);
   ASSERT(0 <= tag && tag < VisitorSynchronization::kNumberOfSyncTags);
   HeapEntry* entry = AddEntry(
-      HeapEntry::kObject,
+      HeapEntry::kSynthetic,
       VisitorSynchronization::kTagNames[tag],
       HeapObjectsMap::GetNthGcSubrootId(tag),
       0);
   gc_subroot_indexes_[tag] = entry->index();
   return entry;
 }
 
 
 HeapEntry* HeapSnapshot::AddEntry(HeapEntry::Type type,
                                   const char* name,
@@ skipping 2417 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