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• Vl-parse-property-list-of-arguments

Vl-parse-event-expression-fragment

Special subset of event_expression for use only in sequence_list_of_actuals.

Signature

(vl-parse-event-expression-fragment &key (tokstream 'tokstream) 
                                    (config 'config)) 
 
  → 
(mv errmsg? value new-tokstream)

Arguments

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

This is similar to vl-parse-event-expression except that our goal is to avoid ambiguity with sequence_expr. In particular, we don't allow:

• Top-level bare expressions without even an edge identifier,
• Top-level or expressions
• Top-level comma-separated expressions
• Parentheses expressions like (foo) where there's only a single expression in the parens without any edge specifier.

Definitions and Theorems

Function: vl-parse-event-expression-fragment-fn

(defun vl-parse-event-expression-fragment-fn (tokstream config)
 (declare (xargs :stobjs (tokstream)))
 (declare (xargs :guard (vl-loadconfig-p config)))
 (declare (ignorable config))
 (let ((__function__ 'vl-parse-event-expression-fragment))
  (declare (ignorable __function__))
  (seq
   tokstream
   (when
    (vl-is-token? :vl-lparen)
    (:= (vl-match))
    (evatoms := (vl-parse-event-expression))
    (:= (vl-match-token :vl-rparen))
    (when
     (and (eql (len evatoms) 1)
          (equal (vl-evatom->type (car evatoms))
                 :vl-noedge))
     (return-raw
      (vl-parse-error
       "Want to backtrack to treat a lone expression (foo) like
                             a sequence expression instead of an event expression.")))
    (return evatoms))
   (edge := (vl-match-some-token
                 '(:vl-kwd-posedge :vl-kwd-negedge :vl-kwd-edge)))
   (expr := (vl-parse-expression))
   (when
    (vl-is-token? :vl-kwd-iff)
    (return-raw
     (vl-parse-error
      "BOZO need to implement event_expressions with 'iff' clauses.")))
   (return (let ((edgetype (case (vl-token->type edge)
                                 (:vl-kwd-posedge :vl-posedge)
                                 (:vl-kwd-negedge :vl-negedge)
                                 (:vl-kwd-edge :vl-edge)
                                 (t (impossible)))))
             (list (vl-evatom edgetype expr)))))))

Theorem: vl-parse-event-expression-fragment-fails-gracefully

(defthm vl-parse-event-expression-fragment-fails-gracefully
  (implies (mv-nth 0 (vl-parse-event-expression-fragment))
           (not (mv-nth 1
                        (vl-parse-event-expression-fragment)))))

Theorem: vl-warning-p-of-vl-parse-event-expression-fragment

(defthm vl-warning-p-of-vl-parse-event-expression-fragment
 (iff (vl-warning-p (mv-nth 0 (vl-parse-event-expression-fragment)))
      (mv-nth 0
              (vl-parse-event-expression-fragment))))

Theorem: vl-parse-event-expression-fragment-result

(defthm vl-parse-event-expression-fragment-result
 (implies
   (and t)
   (vl-evatomlist-p (mv-nth 1
                            (vl-parse-event-expression-fragment)))))

Theorem: vl-parse-event-expression-fragment-true-listp

(defthm vl-parse-event-expression-fragment-true-listp
  (true-listp (mv-nth 1 (vl-parse-event-expression-fragment)))
  :rule-classes :type-prescription)

Theorem: vl-parse-event-expression-fragment-count-strong

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

Theorem: vl-parse-event-expression-fragment-errors-on-eof

(defthm vl-parse-event-expression-fragment-errors-on-eof
  (implies (atom (vl-tokstream->tokens))
           (mv-nth 0
                   (vl-parse-event-expression-fragment))))