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• Stv-expand

Stv-maybe-match-select

Match an expression with an optional bit- or part-select.

Signature

(stv-maybe-match-select x) → (mv err? from msb? lsb?)

Arguments

x — Guard (vl2014::vl-expr-p x).

Returns

err? — Type (maybe-stringp err?).

from — Type (vl2014::vl-expr-p from), given the guard.

msb? — Type (maybe-natp msb?).

lsb? — Type (maybe-natp lsb?).

Definitions and Theorems

Function: stv-maybe-match-select

(defun stv-maybe-match-select (x)
 (declare (xargs :guard (vl2014::vl-expr-p x)))
 (let ((__function__ 'stv-maybe-match-select))
  (declare (ignorable __function__))
  (b*
   (((when (vl2014::vl-atom-p x))
     (mv nil x nil nil))
    (op (vl2014::vl-nonatom->op x))
    (args (vl2014::vl-nonatom->args x))
    ((when (eq op :vl-select-colon))
     (b* ((from (first args))
          (msb (second args))
          (lsb (third args))
          ((unless (and (vl2014::vl-expr-resolved-p msb)
                        (vl2014::vl-expr-resolved-p lsb)))
           (mv (str::cat (symbol-name __function__)
                         ": part select indicies are not resolved: "
                         (vl2014::vl-pps-expr x))
               x nil nil)))
       (mv nil from (vl2014::vl-resolved->val msb)
           (vl2014::vl-resolved->val lsb))))
    ((when (eq op :vl-index))
     (b* ((from (first args))
          (bit (second args))
          ((unless (vl2014::vl-expr-resolved-p bit))
           (mv (str::cat (symbol-name __function__)
                         ": bit select index is not resolved: "
                         (vl2014::vl-pps-expr x))
               x nil nil))
          (val (vl2014::vl-resolved->val bit)))
       (mv nil from val val))))
   (mv nil x nil nil))))

Theorem: maybe-stringp-of-stv-maybe-match-select.err?

(defthm maybe-stringp-of-stv-maybe-match-select.err?
  (b* (((mv ?err? ?from ?msb? ?lsb?)
        (stv-maybe-match-select x)))
    (maybe-stringp err?))
  :rule-classes :type-prescription)

Theorem: vl-expr-p-of-stv-maybe-match-select.from

(defthm vl-expr-p-of-stv-maybe-match-select.from
  (implies (and (force (vl2014::vl-expr-p x)))
           (b* (((mv ?err? ?from ?msb? ?lsb?)
                 (stv-maybe-match-select x)))
             (vl2014::vl-expr-p from)))
  :rule-classes :rewrite)

Theorem: maybe-natp-of-stv-maybe-match-select.msb?

(defthm maybe-natp-of-stv-maybe-match-select.msb?
  (b* (((mv ?err? ?from ?msb? ?lsb?)
        (stv-maybe-match-select x)))
    (maybe-natp msb?))
  :rule-classes :type-prescription)

Theorem: maybe-natp-of-stv-maybe-match-select.lsb?

(defthm maybe-natp-of-stv-maybe-match-select.lsb?
  (b* (((mv ?err? ?from ?msb? ?lsb?)
        (stv-maybe-match-select x)))
    (maybe-natp lsb?))
  :rule-classes :type-prescription)