How to find which objects use most of the memory

[anakreon]

Hello.

Is there any tool which could help finding out which objects consume
most of the memory?

I was thinking something which would generate a report like:
ClassA 120003 instances 3MB
ClassB 4550 instances 1MB
and so on.

I used massif of valgrind but it doesn't do what I need.

Thanks for your reply