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• Advanced-equivalence-checking-with-fgl

Lookup-previous-stack-frame-binding

Signature

(lookup-previous-stack-frame-binding var interp-st) → binding

Arguments

var — Guard (symbolp var).

Returns

binding — Type (fgl-object-p binding).

Definitions and Theorems

Function: lookup-previous-stack-frame-binding

(defun
 lookup-previous-stack-frame-binding
 (var interp-st)
 (declare (xargs :stobjs (interp-st)))
 (declare (xargs :guard (symbolp var)))
 (let
  ((__function__ 'lookup-previous-stack-frame-binding))
  (declare (ignorable __function__))
  (stobj-let ((stack (interp-st->stack interp-st)))
             (binding)
             (b* ((nframes (stack-frames stack))
                  ((when (< nframes 2)) nil)
                  (minor (stack-nth-frame-minor-bindings 1 0 stack))
                  (minor-look (assoc-eq var minor))
                  ((when minor-look) (cdr minor-look))
                  (major (stack-nth-frame-bindings 1 stack)))
                 (cdr (assoc-eq var major)))
             binding)))

Theorem: fgl-object-p-of-lookup-previous-stack-frame-binding

(defthm
 fgl-object-p-of-lookup-previous-stack-frame-binding
 (b* ((binding (lookup-previous-stack-frame-binding var interp-st)))
     (fgl-object-p binding))
 :rule-classes :rewrite)