Parse a
(vl-parse-variable-assignment &key (tokstream 'tokstream) (config 'config)) → (mv errmsg? value new-tokstream)
Both Verilog-2005 and SystemVerilog-2012 agree on this rule:
variable_assignment ::= variable_lvalue '=' expression
Function:
(defun vl-parse-variable-assignment-fn (tokstream config) (declare (xargs :stobjs (tokstream))) (declare (xargs :guard (vl-loadconfig-p config))) (declare (ignorable config)) (let ((__function__ 'vl-parse-variable-assignment)) (declare (ignorable __function__)) (seq tokstream (lvalue := (vl-parse-variable-lvalue)) (:= (vl-match-token :vl-equalsign)) (expr := (vl-parse-expression)) (return (cons lvalue expr)))))
Theorem:
(defthm vl-parse-variable-assignment-fails-gracefully (implies (mv-nth 0 (vl-parse-variable-assignment)) (not (mv-nth 1 (vl-parse-variable-assignment)))))
Theorem:
(defthm vl-warning-p-of-vl-parse-variable-assignment (iff (vl-warning-p (mv-nth 0 (vl-parse-variable-assignment))) (mv-nth 0 (vl-parse-variable-assignment))))
Theorem:
(defthm vl-parse-variable-assignment-result (implies (and (not (mv-nth 0 (vl-parse-variable-assignment))) (and t)) (and (consp (mv-nth 1 (vl-parse-variable-assignment))) (vl-expr-p (car (mv-nth 1 (vl-parse-variable-assignment)))) (vl-expr-p (cdr (mv-nth 1 (vl-parse-variable-assignment)))))))
Theorem:
(defthm vl-parse-variable-assignment-count-strong (and (<= (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-variable-assignment))) (vl-tokstream-measure)) (implies (not (mv-nth 0 (vl-parse-variable-assignment))) (< (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-variable-assignment))) (vl-tokstream-measure)))) :rule-classes ((:rewrite) (:linear)))