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• Parse-statements

Vl-parse-event-trigger

Parse an event_trigger.

Signature

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

Arguments

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

Verilog-2005 Syntax:

event_trigger ::= '->' hierarchical_identifier { '[' expression ']' } ';'

SystemVerilog-2012 Syntax:

event_trigger ::= '->' hierarchical_identifier ';'
                | '->>' [delay_or_event_control] hierarchical_identifier ';'

Interestingly it seems that SystemVerilog doesn't permit the bracketed expressions after the event trigger. What did they mean? I am not sure. There is virtually no discussion of what these bracketed expressions mean in the Verilog-2005 standard...

Definitions and Theorems

Function: vl-parse-event-trigger-fn

(defun vl-parse-event-trigger-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-event-trigger))
  (declare (ignorable __function__))
  (if
   (eq (vl-loadconfig->edition config)
       :verilog-2005)
   (seq
    tokstream
    (:= (vl-match-token :vl-arrow))
    (hid := (vl-parse-hierarchical-identifier nil))
    (bexprs := (vl-parse-0+-bracketed-expressions))
    (:= (vl-match-token :vl-semi))
    (return
     (make-vl-eventtriggerstmt
          :id (make-vl-index :scope (make-vl-scopeexpr-end :hid hid)
                             :part (make-vl-partselect-none)
                             :indices bexprs)
          :atts atts)))
   (seq
    tokstream
    (when
     (vl-is-token? :vl-arrowgt)
     (return-raw
       (vl-parse-error
            "BOZO not yet implemented: '->>' style event trigger")))
    (:= (vl-match-token :vl-arrow))
    (hid := (vl-parse-hierarchical-identifier nil))
    (:= (vl-match-token :vl-semi))
    (return
     (make-vl-eventtriggerstmt
          :id (make-vl-index :scope (make-vl-scopeexpr-end :hid hid)
                             :part (make-vl-partselect-none))
          :atts atts))))))

Theorem: vl-parse-event-trigger-fails-gracefully

(defthm vl-parse-event-trigger-fails-gracefully
  (implies (mv-nth 0 (vl-parse-event-trigger atts))
           (not (mv-nth 1 (vl-parse-event-trigger atts)))))

Theorem: vl-warning-p-of-vl-parse-event-trigger

(defthm vl-warning-p-of-vl-parse-event-trigger
  (iff (vl-warning-p (mv-nth 0 (vl-parse-event-trigger atts)))
       (mv-nth 0 (vl-parse-event-trigger atts))))

Theorem: vl-parse-event-trigger-result

(defthm vl-parse-event-trigger-result
  (implies
       (and (force (vl-atts-p atts)))
       (equal (vl-stmt-p (mv-nth 1 (vl-parse-event-trigger atts)))
              (not (mv-nth 0 (vl-parse-event-trigger atts))))))

Theorem: vl-parse-event-trigger-count-strong

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