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• Fgl-rewrite-rules

Abort-current-rewrite

Sets an error flag in the FGL interpreter state so that it will abort the current rewrite rule application attempt.

Signature

(abort-current-rewrite &key (interp-st 'interp-st)) 
  → 
new-interp-st

Can be run by fancy-ev, e.g. inside FGL's syntax-interp or syntax-bind as well as in syntaxp and bind-free hypotheses in FGL rewrite rules.

Definitions and Theorems

Function: abort-current-rewrite-fn

(defun abort-current-rewrite-fn (interp-st)
  (declare (xargs :stobjs (interp-st)))
  (declare (xargs :guard t))
  (let ((__function__ 'abort-current-rewrite))
    (declare (ignorable __function__))
    (if (interp-st->errmsg interp-st)
        interp-st
      (update-interp-st->errmsg :abort-rewrite interp-st))))

Theorem: interp-st-get-of-abort-current-rewrite

(defthm interp-st-get-of-abort-current-rewrite
  (b* ((?new-interp-st (abort-current-rewrite-fn interp-st)))
    (implies (member (interp-st-field-fix key)
                     *logically-relevant-interp-st-fields*)
             (equal (interp-st-get key new-interp-st)
                    (interp-st-get key interp-st)))))

Theorem: interp-st-bfrs-ok-of-abort-current-rewrite

(defthm interp-st-bfrs-ok-of-abort-current-rewrite
  (b* ((?new-interp-st (abort-current-rewrite-fn interp-st)))
    (implies (interp-st-bfrs-ok interp-st)
             (interp-st-bfrs-ok new-interp-st))))

Theorem: errmsg-of-abort-current-rewrite

(defthm errmsg-of-abort-current-rewrite
  (b* ((?new-interp-st (abort-current-rewrite-fn interp-st)))
    (implies (interp-st->errmsg interp-st)
             (equal (interp-st->errmsg new-interp-st)
                    (interp-st->errmsg interp-st)))))

Theorem: interp-st->errmsg-equal-unreachable-of-abort-current-rewrite

(defthm interp-st->errmsg-equal-unreachable-of-abort-current-rewrite
  (b* ((?new-interp-st (abort-current-rewrite-fn interp-st)))
    (implies (not (equal (interp-st->errmsg interp-st)
                         :unreachable))
             (not (equal (interp-st->errmsg new-interp-st)
                         :unreachable)))))