Exclude filler maps from object properties in heap snapshot.

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 2472 matching lines @@
 bool V8HeapExplorer::IsEssentialObject(Object* object) {
   // We have to use raw_unchecked_* versions because checked versions
   // would fail during iteration over object properties.
   return object->IsHeapObject()
       && !object->IsOddball()
       && object != heap_->raw_unchecked_empty_byte_array()
       && object != heap_->raw_unchecked_empty_fixed_array()
       && object != heap_->raw_unchecked_empty_descriptor_array()
       && object != heap_->raw_unchecked_fixed_array_map()
       && object != heap_->raw_unchecked_global_property_cell_map()
-      && object != heap_->raw_unchecked_shared_function_info_map();
+      && object != heap_->raw_unchecked_shared_function_info_map()
+      && object != heap_->raw_unchecked_free_space_map()
+      && object != heap_->raw_unchecked_one_pointer_filler_map()
+      && object != heap_->raw_unchecked_two_pointer_filler_map();
 }
 
 
 void V8HeapExplorer::SetClosureReference(HeapObject* parent_obj,
                                          HeapEntry* parent_entry,
                                          String* reference_name,
                                          Object* child_obj) {
   HeapEntry* child_entry = GetEntry(child_obj);
   if (child_entry != NULL) {
     filler_->SetNamedReference(HeapGraphEdge::kContextVariable,
@@ skipping 1450 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