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• Adding-z-drivers

Vl-add-zdrivers

Top-level function for adding drivers for undriven outputs.

Signature: (vl-add-zdrivers all-names flat-ins flat-outs occs) returns occs'.

occs should be the initial list of occurrences that we generate from the module instances; see for instance vl-modinst-to-eocc.

flat-outs should be the already-flattened list of the module's output bits, i.e., (pat-flatten (gpl :o mod)).

flat-ins should be the already-flattened list of the module's input bits, i.e., (pat-flatten (gpl :i mod)).

all-names must be a vl-emodwirelist-ps that captures the module's namespace. We expect it to include at least:

• All signals in :i and :o for the module
• All signals used in :i and :o patterns in occs
• The names of all occs (i.e., the :u from each occ)

However, as a special exception, all-names may exclude names that we know cannot have the basename vl_zdrive. This includes, for instance, all of the wires that are added during vl-add-res-modules, and the special wires that are added to drive T and F in vl-module-make-esim.

Definitions and Theorems

Function: vl-add-zdrivers

(defun vl-add-zdrivers (all-names flat-ins flat-outs occs)
 (declare
  (xargs
    :guard (and (vl-emodwirelist-p all-names)
                (vl-emodwirelist-p flat-ins)
                (vl-emodwirelist-p flat-outs)
                (vl-emodwirelist-p (collect-signal-list :i occs))
                (vl-emodwirelist-p (collect-signal-list :o occs)))))
 (b* ((driven-signals
           (union (mergesort flat-ins)
                  (mergesort (collect-signal-list :o occs))))
      (consumed-signals
           (union (mergesort flat-outs)
                  (mergesort (collect-signal-list :i occs))))
      (signals-that-need-zdrivers
           (difference (difference consumed-signals driven-signals)
                       (mergesort '(acl2::f t))))
      ((unless signals-that-need-zdrivers)
       occs)
      (idx (vl-emodwirelist-highest "vl_zdrive" all-names))
      (new-occs (vl-make-z-occs idx signals-that-need-zdrivers)))
   (append new-occs occs)))

Theorem: good-esim-occsp-of-vl-add-zdrivers

(defthm good-esim-occsp-of-vl-add-zdrivers
 (implies
      (and (force (vl-emodwirelist-p all-names))
           (force (vl-emodwirelist-p flat-ins))
           (force (vl-emodwirelist-p flat-outs))
           (force (vl-emodwirelist-p (collect-signal-list :i occs)))
           (force (vl-emodwirelist-p (collect-signal-list :o occs)))
           (force (good-esim-occsp occs)))
      (good-esim-occsp
           (vl-add-zdrivers all-names flat-ins flat-outs occs))))