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• Parse-assignments

Vl-parse-continuous-assign

Parse a continuous_assign into a vl-assignlist-p.

Signature

(vl-parse-continuous-assign atts &key (tokstream 'tokstream) 
                            (config 'config)) 
 
  → 
(mv errmsg? value new-tokstream)

Arguments

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

Verilog-2005:

continuous_assign ::= 'assign' [drive_strength] [delay3] list_of_net_assignments ';'

SystemVerilog-2012:

continuous_assign ::= 'assign' [drive_strength] [delay3] list_of_net_assignments ';'
                    | 'assign' [delay_control] list_of_variable_assignments ';'

Note that the delay_control here is just a small subset of a delay3:

delay_control ::= '#' delay_value
                | '# '(' mintypmax_expression ')'

delay3 ::= '#' delay_value
         | '#' '(' mintypmax_expression [...optional stuff...] ')'

Definitions and Theorems

Function: vl-parse-continuous-assign-fn

(defun vl-parse-continuous-assign-fn (atts tokstream config)
 (declare (xargs :stobjs (tokstream)))
 (declare (xargs :guard (vl-loadconfig-p config)))
 (declare (ignorable config))
 (declare (xargs :guard (vl-atts-p atts)))
 (let ((__function__ 'vl-parse-continuous-assign))
  (declare (ignorable __function__))
  (seq
   tokstream
   (assignkwd := (vl-match-token :vl-kwd-assign))
   (when (vl-is-token? :vl-lparen)
         (strength := (vl-parse-drive-strength-or-charge-strength)))
   (when
    (vl-cstrength-p strength)
    (return-raw
     (vl-parse-error
         "Assign statement illegally contains a charge strength.")))
   (when (vl-is-token? :vl-pound)
         (delay := (vl-parse-delay3)))
   (pairs :=
          (if (eq (vl-loadconfig->edition config)
                  :verilog-2005)
              (vl-parse-list-of-net-assignments)
            (vl-parse-list-of-variable-assignments)))
   (:= (vl-match-token :vl-semi))
   (return (vl-build-assignments (vl-token->loc assignkwd)
                                 pairs strength delay atts)))))

Theorem: vl-parse-continuous-assign-fails-gracefully

(defthm vl-parse-continuous-assign-fails-gracefully
  (implies (mv-nth 0 (vl-parse-continuous-assign atts))
           (not (mv-nth 1 (vl-parse-continuous-assign atts)))))

Theorem: vl-warning-p-of-vl-parse-continuous-assign

(defthm vl-warning-p-of-vl-parse-continuous-assign
  (iff (vl-warning-p (mv-nth 0 (vl-parse-continuous-assign atts)))
       (mv-nth 0 (vl-parse-continuous-assign atts))))

Theorem: vl-parse-continuous-assign-result

(defthm vl-parse-continuous-assign-result
 (implies
    (and (force (vl-atts-p atts)))
    (vl-assignlist-p (mv-nth 1 (vl-parse-continuous-assign atts)))))

Theorem: vl-parse-continuous-assign-true-listp

(defthm vl-parse-continuous-assign-true-listp
  (true-listp (mv-nth 1 (vl-parse-continuous-assign atts)))
  :rule-classes :type-prescription)

Theorem: vl-parse-continuous-assign-count-strong

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