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• Stmtrewrite

Vl-forstmt-rewrite

Eliminate purely null vl-forstmts.

Signature

(vl-forstmt-rewrite x body warnings) → (mv warnings stmt)

Arguments

x — Guard (vl-stmt-p x).

body — Guard (vl-stmt-p body).

warnings — Guard (vl-warninglist-p warnings).

Returns

warnings — Type (vl-warninglist-p warnings), given the guard.

stmt — Type (vl-stmt-p stmt), given the guard.

The basic rewrite this performs is:

for(initlhs = initrhs; test; nextlhs = nextrhs)
   [null] ;
  -->
[null];

We could eventually unroll things. This rewrite is generally meant to allow us to ignore for loops with $display statements and similar.

Definitions and Theorems

Function: vl-forstmt-rewrite

(defun vl-forstmt-rewrite (x body warnings)
  (declare (xargs :guard (and (vl-stmt-p x)
                              (vl-stmt-p body)
                              (vl-warninglist-p warnings))))
  (declare (xargs :guard (eq (vl-stmt-kind x) :vl-forstmt)))
  (let ((__function__ 'vl-forstmt-rewrite))
    (declare (ignorable __function__))
    (if (vl-nullstmt-p body)
        (mv warnings body)
      (mv warnings
          (change-vl-forstmt x :body body)))))

Theorem: vl-warninglist-p-of-vl-forstmt-rewrite.warnings

(defthm vl-warninglist-p-of-vl-forstmt-rewrite.warnings
  (implies (and (force (vl-stmt-p x))
                (force (vl-stmt-p body))
                (force (vl-warninglist-p warnings))
                (force (eq (vl-stmt-kind$inline x)
                           ':vl-forstmt)))
           (b* (((mv ?warnings ?stmt)
                 (vl-forstmt-rewrite x body warnings)))
             (vl-warninglist-p warnings)))
  :rule-classes :rewrite)

Theorem: vl-stmt-p-of-vl-forstmt-rewrite.stmt

(defthm vl-stmt-p-of-vl-forstmt-rewrite.stmt
  (implies (and (force (vl-stmt-p x))
                (force (vl-stmt-p body))
                (force (vl-warninglist-p warnings))
                (force (eq (vl-stmt-kind$inline x)
                           ':vl-forstmt)))
           (b* (((mv ?warnings ?stmt)
                 (vl-forstmt-rewrite x body warnings)))
             (vl-stmt-p stmt)))
  :rule-classes :rewrite)