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Selfassigns

Vl-assign-check-selfassigns

(vl-assign-check-selfassigns x ss) checks an assignment for bits that occur on the lhs and rhs.

Signature
(vl-assign-check-selfassigns x ss) → warnings
Arguments: x — Guard (vl-assign-p x).; ss — Guard (vl-scopestack-p ss).
Returns: warnings — Type (vl-warninglist-p warnings).

Definitions and Theorems

Function: vl-assign-check-selfassigns

(defun vl-assign-check-selfassigns (x ss)
 (declare (xargs :guard (and (vl-assign-p x)
                             (vl-scopestack-p ss))))
 (let ((__function__ 'vl-assign-check-selfassigns))
  (declare (ignorable __function__))
  (b* (((vl-assign x) (vl-assign-fix x))
       (lhs-bits (mergesort (vl-expr-approx-bits x.lvalue ss)))
       (rhs-bits (mergesort (vl-expr-approx-bits x.expr ss)))
       (oops (intersect lhs-bits rhs-bits)))
    (if oops
      (list (make-vl-warning :type :vl-warn-selfassign
                             :msg "~a0: lhs bits occur on rhs: ~&1."
                             :args (list x oops)
                             :fatalp nil
                             :fn __function__))
      nil))))

Theorem: vl-warninglist-p-of-vl-assign-check-selfassigns

(defthm vl-warninglist-p-of-vl-assign-check-selfassigns
  (b* ((warnings (vl-assign-check-selfassigns x ss)))
    (vl-warninglist-p warnings))
  :rule-classes :rewrite)

Theorem: vl-assign-check-selfassigns-of-vl-assign-fix-x

(defthm vl-assign-check-selfassigns-of-vl-assign-fix-x
  (equal (vl-assign-check-selfassigns (vl-assign-fix x)
                                      ss)
         (vl-assign-check-selfassigns x ss)))

Theorem: vl-assign-check-selfassigns-vl-assign-equiv-congruence-on-x

(defthm vl-assign-check-selfassigns-vl-assign-equiv-congruence-on-x
  (implies (vl-assign-equiv x x-equiv)
           (equal (vl-assign-check-selfassigns x ss)
                  (vl-assign-check-selfassigns x-equiv ss)))
  :rule-classes :congruence)

Theorem: vl-assign-check-selfassigns-of-vl-scopestack-fix-ss

(defthm vl-assign-check-selfassigns-of-vl-scopestack-fix-ss
  (equal (vl-assign-check-selfassigns x (vl-scopestack-fix ss))
         (vl-assign-check-selfassigns x ss)))

Theorem: vl-assign-check-selfassigns-vl-scopestack-equiv-congruence-on-ss

(defthm
   vl-assign-check-selfassigns-vl-scopestack-equiv-congruence-on-ss
  (implies (vl-scopestack-equiv ss ss-equiv)
           (equal (vl-assign-check-selfassigns x ss)
                  (vl-assign-check-selfassigns x ss-equiv)))
  :rule-classes :congruence)