The function object-pointer returns an integer specifying the actual representation of the object object. For most objects, that would be the pointer to it, which is its address (as returned by object-address) plus some tag. Some objects are "immediate" (that is they do not use memory, and immediatep returns t) and for these object-pointer returns the actual address.
The Garbage Collector can move objects, therefore the result of object-pointer is not permanent. It should be used only for debugging.
(let ((gf #'make-instance))
(format t "~a pointer is ~x~%" gf
(sys:object-pointer gf)))
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