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• the klass field of every object
• every oop instance field
• every element of an oop array (objArray)
• in a constant pool... (what is the rule here??)
• (what else is compressed??)

The following oops in the heap are never compressed:

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The Hotspot VM's data structures to manage Java classes are not compressed. These are generally found in the section of the Java heap known as the Permanent Generation (PermGen).

In the interpreter, oops are never compressed. These include JVM locals and stack elements, outgoing call arguments, and return values. The interpreter eagerly decodes oops loaded from the heap, and encodes them before storing them to the heap.

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