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• Sv::vl-expr.lisp

Vl-structmemberlist-shift-bits

Signature

(vl-structmemberlist-shift-bits x field) → (mv err shift)

Arguments

x — Guard (vl-structmemberlist-p x).

field — Guard (stringp field).

Returns

err — Type (iff (vl-msg-p err) err).

shift — Type (implies (not err) (natp shift)).

Definitions and Theorems

Function: vl-structmemberlist-shift-bits

(defun vl-structmemberlist-shift-bits (x field)
  (declare (xargs :guard (and (vl-structmemberlist-p x)
                              (stringp field))))
  (declare (xargs :guard (vl-structmemberlist-resolved-p x)))
  (let ((__function__ 'vl-structmemberlist-shift-bits))
    (declare (ignorable __function__))
    (b* ((field (string-fix field))
         ((when (atom x))
          (mv (vmsg "Field not found: ~s0" field)
              nil))
         ((vl-structmember x1) (car x))
         ((when (equal x1.name field))
          (mv nil 0))
         ((mv err size)
          (vl-datatype-size x1.type))
         ((when err) (mv err nil))
         ((unless size)
          (mv (vmsg "Couldn't size struct member type: ~a0"
                    x1.type)
              nil))
         ((mv err rest)
          (vl-structmemberlist-shift-bits (cdr x)
                                          field))
         ((when err) (mv err nil)))
      (mv nil (+ size rest)))))

Theorem: return-type-of-vl-structmemberlist-shift-bits.err

(defthm return-type-of-vl-structmemberlist-shift-bits.err
  (b* (((mv ?err ?shift)
        (vl-structmemberlist-shift-bits x field)))
    (iff (vl-msg-p err) err))
  :rule-classes :rewrite)

Theorem: return-type-of-vl-structmemberlist-shift-bits.shift

(defthm return-type-of-vl-structmemberlist-shift-bits.shift
  (b* (((mv ?err ?shift)
        (vl-structmemberlist-shift-bits x field)))
    (implies (not err) (natp shift)))
  :rule-classes :type-prescription)

Theorem: vl-structmemberlist-shift-bits-of-vl-structmemberlist-fix-x

(defthm vl-structmemberlist-shift-bits-of-vl-structmemberlist-fix-x
  (equal (vl-structmemberlist-shift-bits (vl-structmemberlist-fix x)
                                         field)
         (vl-structmemberlist-shift-bits x field)))

Theorem: vl-structmemberlist-shift-bits-vl-structmemberlist-equiv-congruence-on-x

(defthm
 vl-structmemberlist-shift-bits-vl-structmemberlist-equiv-congruence-on-x
 (implies (vl-structmemberlist-equiv x x-equiv)
          (equal (vl-structmemberlist-shift-bits x field)
                 (vl-structmemberlist-shift-bits x-equiv field)))
 :rule-classes :congruence)

Theorem: vl-structmemberlist-shift-bits-of-str-fix-field

(defthm vl-structmemberlist-shift-bits-of-str-fix-field
  (equal (vl-structmemberlist-shift-bits x (str-fix field))
         (vl-structmemberlist-shift-bits x field)))

Theorem: vl-structmemberlist-shift-bits-streqv-congruence-on-field

(defthm vl-structmemberlist-shift-bits-streqv-congruence-on-field
  (implies (streqv field field-equiv)
           (equal (vl-structmemberlist-shift-bits x field)
                  (vl-structmemberlist-shift-bits x field-equiv)))
  :rule-classes :congruence)