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• Parse-statements

Vl-parse-case-keyword

Parse a case_keyword into a vl-casetype-p.

Signature

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

Arguments

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

The rule from SystemVerilog-2012 is:

case_keyword ::= 'case' | 'casez' | 'casex'

This is also useful in Verilog-2005, but isn't a named rule in the Verilog-2005 grammar.

Definitions and Theorems

Function: vl-parse-case-keyword-fn

(defun vl-parse-case-keyword-fn (tokstream config)
  (declare (xargs :stobjs (tokstream)))
  (declare (xargs :guard (vl-loadconfig-p config)))
  (declare (ignorable config))
  (let ((__function__ 'vl-parse-case-keyword))
    (declare (ignorable __function__))
    (seq tokstream
         (type := (vl-match-some-token
                       '(:vl-kwd-case :vl-kwd-casez :vl-kwd-casex)))
         (return (cons (case (vl-token->type type)
                             (:vl-kwd-case nil)
                             (:vl-kwd-casez :vl-casez)
                             (:vl-kwd-casex :vl-casex))
                       (vl-token->loc type))))))

Theorem: vl-parse-case-keyword-fails-gracefully

(defthm vl-parse-case-keyword-fails-gracefully
  (implies (mv-nth 0 (vl-parse-case-keyword))
           (not (mv-nth 1 (vl-parse-case-keyword)))))

Theorem: vl-warning-p-of-vl-parse-case-keyword

(defthm vl-warning-p-of-vl-parse-case-keyword
  (iff (vl-warning-p (mv-nth 0 (vl-parse-case-keyword)))
       (mv-nth 0 (vl-parse-case-keyword))))

Theorem: vl-parse-case-keyword-result

(defthm vl-parse-case-keyword-result
 (implies
    (and (not (mv-nth 0 (vl-parse-case-keyword)))
         (and t))
    (and (consp (mv-nth 1 (vl-parse-case-keyword)))
         (vl-casetype-p (car (mv-nth 1 (vl-parse-case-keyword))))
         (vl-location-p (cdr (mv-nth 1 (vl-parse-case-keyword)))))))

Theorem: vl-parse-case-keyword-count-strong

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