Add method for resolving SnapshotObjectId by given object

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 1348 matching lines @@
   }
   to_entry->value = reinterpret_cast<void*>(from_entry_info_index);
 }
 
 
 SnapshotObjectId HeapObjectsMap::FindEntry(Address addr) {
   HashMap::Entry* entry = entries_map_.Lookup(addr, AddressHash(addr), false);
   if (entry == NULL) return 0;
   int entry_index = static_cast<int>(reinterpret_cast<intptr_t>(entry->value));
   EntryInfo& entry_info = entries_->at(entry_index);
-  entry_info.accessed = true;

[yurys, 2012/04/16 13:04:38]

HeapObjectsMap::FindEntry is only called by
HeapSnapshotsCollection::FindHeapObjectById and the new
HeapSnapshotsCollection::FindObjectId methods. In both cases we shouldn't update
the flag.

   ASSERT(static_cast<uint32_t>(entries_->length()) > entries_map_.occupancy());
   return entry_info.id;
 }
 
 
 SnapshotObjectId HeapObjectsMap::FindOrAddEntry(Address addr,
                                                 unsigned int size) {
   ASSERT(static_cast<uint32_t>(entries_->length()) > entries_map_.occupancy());
   HashMap::Entry* entry = entries_map_.Lookup(addr, AddressHash(addr), true);
   if (entry->value != NULL) {
@@ skipping 2480 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