Show map -> transition array -> descriptor array to the 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 1989 matching lines @@
   }
 }
 
 
 void V8HeapExplorer::ExtractMapReferences(int entry, Map* map) {
   SetInternalReference(map, entry,
                        "prototype", map->prototype(), Map::kPrototypeOffset);
   SetInternalReference(map, entry,
                        "constructor", map->constructor(),
                        Map::kConstructorOffset);
-  if (!map->instance_descriptors()->IsEmpty()) {
-    TagObject(map->instance_descriptors(), "(map descriptors)");
-    // TODO(verwaest): Check what to do here.
+  if (map->HasTransitionArray()) {
+    TransitionArray* transitions = map->transitions();
+    if (!transitions->descriptors()->IsEmpty()) {
+      DescriptorArray* descriptors = transitions->descriptors();
+      TagObject(descriptors, "(map descriptors)");
+      SetInternalReference(transitions, entry,
+                           "descriptors", descriptors,
+                           TransitionArray::kDescriptorsOffset);
+      IndexedReferencesExtractor refs_extractor(
+          this, transitions, entry);
+      transitions->Iterate(&refs_extractor);
+    }
+    TagObject(transitions, "(transition array)");
     SetInternalReference(map, entry,
-                         "descriptors", map->instance_descriptors(),
+                         "transitions", transitions,
                          Map::kTransitionsOrBackPointerOffset);
   }
   SetInternalReference(map, entry,
                        "code_cache", map->code_cache(),
                        Map::kCodeCacheOffset);
 }
 
 
 void V8HeapExplorer::ExtractSharedFunctionInfoReferences(
     int entry, SharedFunctionInfo* shared) {
@@ skipping 1544 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