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(in-package "ACL2")
(program)
; In this file, an event-control (evctl) data structure is either (posedge
; clk), (negedge clk), or (even n).
(defun negate-event-control (evctl)
(if (equal evctl '(even n))
(list 'not evctl)
(let* ((edge0 (car evctl))
(clk (cadr evctl))
(edge (case edge0
(posedge 'pedge)
(negedge 'nedge)
(otherwise
(er hard 'gen-model-preamble-common
"Unable to handle edge specifier ~x0."
edge0)))))
`(not (,edge (,clk (1- n)) (,clk n))))))
(defun negate-event-control-list (x)
(declare (xargs :guard (true-listp x)))
(if (endp x)
nil
(cons (negate-event-control (car x))
(negate-event-control-list (cdr x)))))
(defmacro def$open (name type &rest evctl-lst)
(if (eq type :skipped)
`(value-triple '(def$open ,name :skipped))
(let ((evctl-lst (if (eq type :input)
(assert$ (null evctl-lst)
'((even n)))
evctl-lst)))
`(defthm ,(intern-in-package-of-symbol
(concatenate 'string (symbol-name name) "$OPEN")
name)
(implies (and (integerp n)
(< 0 n)
,@(negate-event-control-list evctl-lst))
(equal (,name n)
(,name (1- n))))
:hints (("Goal"
:expand ((,name n)
,@(and (eq type :wire) `((,name (1- n)))))))))))
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