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• Parse-clocking

Vl-parse-clocking-direction

Matches clocking_direction.

Signature

(vl-parse-clocking-direction &key (tokstream 'tokstream) 
                             (config 'config)) 
 
  → 
(mv errmsg? value new-tokstream)

Arguments

config — Guard (vl-loadconfig-p config).

SystemVerilog Grammar:

clocking_direction ::=
   'input'  [ clocking_skew ]
 | 'output' [ clocking_skew ]
 | 'input' [ clocking_skew ] 'output' [ clocking_skew ]
 | 'inout'

Definitions and Theorems

Function: vl-parse-clocking-direction-fn

(defun vl-parse-clocking-direction-fn (tokstream config)
 (declare (xargs :stobjs (tokstream)))
 (declare (xargs :guard (vl-loadconfig-p config)))
 (declare (ignorable config))
 (let ((__function__ 'vl-parse-clocking-direction))
  (declare (ignorable __function__))
  (seq
    tokstream
    (when (vl-is-token? :vl-kwd-inout)
          (:= (vl-match))
          (return (make-vl-clocking-direction-head :inp t
                                                   :outp t
                                                   :iskew nil
                                                   :oskew nil)))
    (when (vl-is-token? :vl-kwd-output)
          (:= (vl-match))
          (oskew := (vl-maybe-parse-clocking-skew))
          (return (make-vl-clocking-direction-head :inp nil
                                                   :outp t
                                                   :iskew nil
                                                   :oskew oskew)))
    (:= (vl-match-token :vl-kwd-input))
    (iskew := (vl-maybe-parse-clocking-skew))
    (when (vl-is-token? :vl-kwd-output)
          (output := (vl-match))
          (oskew := (vl-maybe-parse-clocking-skew)))
    (return (make-vl-clocking-direction-head :inp t
                                             :outp (if output t nil)
                                             :iskew iskew
                                             :oskew oskew)))))

Theorem: vl-parse-clocking-direction-fails-gracefully

(defthm vl-parse-clocking-direction-fails-gracefully
  (implies (mv-nth 0 (vl-parse-clocking-direction))
           (not (mv-nth 1 (vl-parse-clocking-direction)))))

Theorem: vl-warning-p-of-vl-parse-clocking-direction

(defthm vl-warning-p-of-vl-parse-clocking-direction
  (iff (vl-warning-p (mv-nth 0 (vl-parse-clocking-direction)))
       (mv-nth 0 (vl-parse-clocking-direction))))

Theorem: vl-parse-clocking-direction-result

(defthm vl-parse-clocking-direction-result
  (implies (and t)
           (equal (vl-clocking-direction-head-p
                       (mv-nth 1 (vl-parse-clocking-direction)))
                  (not (mv-nth 0 (vl-parse-clocking-direction))))))

Theorem: vl-parse-clocking-direction-count-strong

(defthm vl-parse-clocking-direction-count-strong
 (and
   (<= (vl-tokstream-measure
            :tokstream (mv-nth 2 (vl-parse-clocking-direction)))
       (vl-tokstream-measure))
   (implies
        (not (mv-nth 0 (vl-parse-clocking-direction)))
        (< (vl-tokstream-measure
                :tokstream (mv-nth 2 (vl-parse-clocking-direction)))
           (vl-tokstream-measure))))
 :rule-classes ((:rewrite) (:linear)))