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• Parse-clocking

Vl-parse-clocking-skew

Match clocking_skew.

Signature

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

Arguments

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

SystemVerilog-2012:

clocking_skew ::= edge_identifier [delay_control]
                | delay_control

Definitions and Theorems

Function: vl-parse-clocking-skew-fn

(defun vl-parse-clocking-skew-fn (tokstream config)
 (declare (xargs :stobjs (tokstream)))
 (declare (xargs :guard (vl-loadconfig-p config)))
 (declare (ignorable config))
 (let ((__function__ 'vl-parse-clocking-skew))
  (declare (ignorable __function__))
  (seq
   tokstream
   (when (vl-is-some-token?
              '(:vl-kwd-posedge :vl-kwd-negedge :vl-kwd-edge))
         (edge := (vl-match)))
   (when (vl-is-token? :vl-pound)
         (delay := (vl-parse-delay-control)))
   (unless
       (or edge delay)
       (return-raw
            (vl-parse-error "Expected edge identifier or #delay.")))
   (return (make-vl-clkskew
                :delay (and delay (vl-delaycontrol->value delay))
                :edge (case (and edge (vl-token->type edge))
                            (:vl-kwd-posedge :vl-posedge)
                            (:vl-kwd-negedge :vl-negedge)
                            (:vl-kwd-edge :vl-edge)
                            (otherwise :vl-noedge)))))))

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

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

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

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

Theorem: vl-parse-clocking-skew-result

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

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

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

Theorem: vl-parse-clocking-skew-is-also-a-maybe-clkskew

(defthm vl-parse-clocking-skew-is-also-a-maybe-clkskew
  (b* (((mv ?err val ?tokstream)
        (vl-parse-clocking-skew)))
    (vl-maybe-clkskew-p val)))