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• Elim-unused-vars

Vl-module-elim-unused-vars

Signature

(vl-module-elim-unused-vars x) → new-x

Arguments

x — Guard (vl-module-p x).

Returns

new-x — Type (vl-module-p new-x).

Definitions and Theorems

Function: vl-module-elim-unused-vars

(defun vl-module-elim-unused-vars (x)
 (declare (xargs :guard (vl-module-p x)))
 (let ((__function__ 'vl-module-elim-unused-vars))
  (declare (ignorable __function__))
  (b*
   ((x (vl-module-fix x))
    ((vl-module x) x)
    ((unless (consp x.vardecls)) x)
    (used (vl-exprlist-names (vl-module-allexprs x)))
    (new-vars (vl-keep-vardecls used x.vardecls))
    ((when (same-lengthp new-vars x.vardecls))
     x)
    (warnings x.warnings)
    (old-varnames (mergesort (vl-vardecllist->names x.vardecls)))
    (new-varnames (mergesort (vl-vardecllist->names new-vars)))
    (unused-varnames (difference old-varnames new-varnames))
    (warnings
        (if unused-varnames
            (warn :type :vl-warn-unused-var
                  :msg "In ~m0, eliminating spurious variables ~&1."
                  :args (list (vl-module->name x)
                              unused-varnames))
          warnings))
    (new-x (change-vl-module x
                             :vardecls new-vars
                             :warnings warnings)))
   new-x)))

Theorem: vl-module-p-of-vl-module-elim-unused-vars

(defthm vl-module-p-of-vl-module-elim-unused-vars
  (b* ((new-x (vl-module-elim-unused-vars x)))
    (vl-module-p new-x))
  :rule-classes :rewrite)

Theorem: vl-module-elim-unused-vars-of-vl-module-fix-x

(defthm vl-module-elim-unused-vars-of-vl-module-fix-x
  (equal (vl-module-elim-unused-vars (vl-module-fix x))
         (vl-module-elim-unused-vars x)))

Theorem: vl-module-elim-unused-vars-vl-module-equiv-congruence-on-x

(defthm vl-module-elim-unused-vars-vl-module-equiv-congruence-on-x
  (implies (vl-module-equiv x x-equiv)
           (equal (vl-module-elim-unused-vars x)
                  (vl-module-elim-unused-vars x-equiv)))
  :rule-classes :congruence)