Earlier quoted context omitted.
A class wrapping a long value with the pointer address in it.
How is the C memory modelled? One big Java array, or are there multiple data-structures? For instance, what happens when you call a function-pointer?
It can be done in a few different ways. Native memory can be managed as plain native memory (under the hood you can use Unsafe to access that memory) but the real advantage is that pointers to many objects can be kept as managed pointers and not converted to a native value most of the time. For example Ruby C extensions often use VALUEs to refer to Ruby objects which are normally tagged pointers. In TruffleRuby we use ValueWrapper objects to represent these, and maintain a fast map between native values and these objects when necessary.