Heap profiler: implement diffing of snapshots.

src/heap.cc

 // Copyright 2009 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 1089 matching lines @@
   // Copy the content of source to target.
   Heap::CopyBlock(target->address(), source->address(), size);
 
   // Set the forwarding address.
   source->set_map_word(MapWord::FromForwardingAddress(target));
 
 #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING)
   // Update NewSpace stats if necessary.
   RecordCopiedObject(target);
 #endif
+  HEAP_PROFILE(ObjectMoveEvent(source->address(), target->address()));
 
   return target;
 }
 
 
 enum ObjectContents  { DATA_OBJECT, POINTER_OBJECT };
 enum SizeRestriction { SMALL, UNKNOWN_SIZE };
 
 
 template<ObjectContents object_contents, SizeRestriction size_restriction>
@@ skipping 3862 matching lines @@
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 List<Object*> ExternalStringTable::new_space_strings_;
 List<Object*> ExternalStringTable::old_space_strings_;
 
 } }  // namespace v8::internal