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Reference-value

Reference-value-kind

Get the kind (tag) of a reference-value structure.

Signature
(reference-value-kind x) → kind
Arguments: x — Guard (reference-valuep x).

Definitions and Theorems

Function: reference-value-kind$inline

(defun reference-value-kind$inline (x)
  (declare (xargs :guard (reference-valuep x)))
  (let ((__function__ 'reference-value-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :pointer))
                       :pointer)
                      (t :null))
         :exec (car x))))

Theorem: reference-value-kind-possibilities

(defthm reference-value-kind-possibilities
  (or (equal (reference-value-kind x)
             :pointer)
      (equal (reference-value-kind x) :null))
  :rule-classes
  ((:forward-chaining :trigger-terms ((reference-value-kind x)))))