I remember I've studied this a while back, but the exact answer eludes me. I suppose they use techniques akin to what JVM uses (see [1]). [1] www.research.

I remember I've studied this a while back, but the exact answer eludes me. I suppose they use techniques akin to what JVM uses (see [1]). [1] www.research.ibm.com/people/d/dgrove/papers/oopsla01.pdf