		Search-engine friendly clone of the ACL2 documentation.

Eval-state

Eval-state-p

Recognizer for eval-state structures.

Signature
(eval-state-p x) → *

Definitions and Theorems

Function: eval-state-p

(defun eval-state-p (x)
  (declare (xargs :guard t))
  (let ((__function__ 'eval-state-p))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :init))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 2)
                     (b* ((function (std::da-nth 0 (cdr x)))
                          (arguments (std::da-nth 1 (cdr x))))
                       (and (symbol-valuep function)
                            (value-listp arguments)))))
               ((eq (car x) :trans)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((stack (std::da-nth 0 (cdr x))))
                       (stackp stack))))
               ((eq (car x) :final)
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 1)
                     (b* ((result (std::da-nth 0 (cdr x))))
                       (valuep result))))
               (t (and (eq (car x) :error)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-eval-state-p

(defthm consp-when-eval-state-p
  (implies (eval-state-p x) (consp x))
  :rule-classes :compound-recognizer)