		Search-engine friendly clone of the ACL2 documentation.

State-stobj

Error1

Refine error to use the stobj states.

Definitions and Theorems

Function: error1

(defun error1 (stat feat)
 (declare (xargs :non-executable t))
 (declare
    (xargs :guard (non-exec (and (stat1p stat)
                                 (statp (stat-from-stat1 stat))
                                 (featp feat)
                                 (stat-validp (stat-from-stat1 stat)
                                              feat)))))
 (prog2$ (acl2::throw-nonexec-error 'error1
                                    (list stat feat))
         (let ((change-stat stat) (stat->error t))
           (if (acl2::mbt$ (stat1p change-stat))
               (let ((change-stat (stat-from-stat1 change-stat)))
                 (stat (stat->xregs change-stat)
                       (stat->pc change-stat)
                       (stat->memory change-stat)
                       stat->error))
             0))))

Theorem: error1-to-error

(defthm error1-to-error
  (implies (stat1p stat)
           (equal (error1 stat feat)
                  (error (stat-from-stat1 stat) feat)))
  :rule-classes :rewrite)

Theorem: error-to-error1

(defthm error-to-error1
  (implies (statp stat)
           (equal (error stat feat)
                  (error1 (stat1-from-stat stat) feat)))
  :rule-classes :rewrite)