Object histogramin the vm (--print-object-histogram).

runtime/vm/snapshot.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 461 matching lines @@
            (class_id <= kExternalTypedDataFloat32x4ArrayCid));
     return isolate()->class_table()->At(class_id);
   }
   cls_ = Object::class_class();
   RawClass* obj = reinterpret_cast<RawClass*>(
       AllocateUninitialized(cls_, Class::InstanceSize()));
   Instance fake;
   obj->ptr()->handle_vtable_ = fake.vtable();
   cls_ = obj;
   cls_.set_id(kIllegalCid);
-  isolate()->class_table()->Register(cls_);
+  isolate()->RegisterClass(cls_);
   return cls_.raw();
 }
 
 
 RawMint* SnapshotReader::NewMint(int64_t value) {
   ASSERT(kind_ == Snapshot::kFull);
   ASSERT(isolate()->no_gc_scope_depth() != 0);
   cls_ = object_store()->mint_class();
   RawMint* obj = reinterpret_cast<RawMint*>(
       AllocateUninitialized(cls_, Mint::InstanceSize()));
@@ skipping 973 matching lines @@
     UnmarkAll();
     isolate->set_long_jump_base(base);
   } else {
     isolate->set_long_jump_base(base);
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart