source: vis_dev/vis-2.3/share/visdbgpp @ 81

#! /usr/bin/perl
#
# Postprocess debug file from vis
#   Combine bus signals
#
# Author: Toshi Isogai
#
# $Id: visdbgpp,v 1.1 2001/03/14 20:10:04 hsv Exp $

%sigval = ();

while (<>) {
  if (m{^([\w\.]+(<\*\d+\*>)?)<\d+>}) { # a (possibly partial) state
    # get lines on the same bus
    $sig = $1;
    $val = $sigval{$sig};
    # Quote the signal name when using it as pattern because it may
    # contain the metacharacter '*'.
    while (m{^\Q$sig\E<(\d+)>:(\d)}) {
      $val = ($val & ~(1<<$1)) | ($2 << $1); # replace value on bit
      $_ = <ARGV>;
    }
    printf "$sig:0x%X\n", $val;
    $sigval{$sig} = $val;
    redo;

  } elsif (m{<}) {              # a CTL formula
      # combine (xyz<a+1:a> * xyz<a-1>) into xyz<a+1:a-1>
      while (m{\(([\w\.]+(<\*\d+\*>)?)<(\d+)(:(\d+))?>=(0x)?([\da-fA-F]+)
               \s\*\s
               \1<(\d+)>=(\d)\)}xg) {
        $str = $&;              # entire matched string
        $sig = $1;              # signal name
        $msb = $3;              # most significant bit index
        $lsb = $5;              # optional least significant bit index
        $val = hex ($7);        # value of left-hand side
        $newlsb = $8;           # index being added to the vector
        $bit = $9;              # value of the new bit

        if ($lsb eq '') {
          # new start
          $lsb = $msb;
        }

        if ($lsb == $newlsb+1 || $msb == $newlsb-1) {
          $val = sprintf("%X",($val << 1) + $bit);

          s{\Q$str\E}{$sig<$msb:$newlsb>=0x$val};

        } else {
          # warning
          print (STDERR "Warning: Non concecutive bits at $.. ");
          if ($msb == $lsb) {
            print (STDERR "Bit $msb next to Bit $newlsb\n");
          } else {
            print (STDERR "MSB $msb LSB $lsb next to Bit $newlsb\n");
          }
        }

      }

  }
  print;
  last if eof();

}