source: vendor/perl/5.8.8/regcomp.pl

BEGIN {
    # Get function prototypes
    require 'regen_lib.pl';
}
#use Fatal qw(open close rename chmod unlink);
open DESC, 'regcomp.sym';
$ind = 0;

while (<DESC>) {
  next if /^\s*($|\#)/;
  $ind++;
  chomp;
  ($name[$ind], $desc, $rest[$ind]) = split /\t+/, $_, 3;
  ($type[$ind], $code[$ind], $args[$ind], $longj[$ind]) 
    = split /[,\s]\s*/, $desc, 4;
}
close DESC;
$tot = $ind;

$tmp_h = 'tmp_reg.h';

unlink $tmp_h if -f $tmp_h;

open OUT, ">$tmp_h";
binmode OUT;

print OUT <<EOP;
/* -*- buffer-read-only: t -*-
   !!!!!!!   DO NOT EDIT THIS FILE   !!!!!!!
   This file is built by regcomp.pl from regcomp.sym.
   Any changes made here will be lost!
*/

EOP

$ind = 0;
while (++$ind <= $tot) {
  $oind = $ind - 1;
  $hind = sprintf "%#4x", $oind;
  print OUT <<EOP;
#define $name[$ind]     $oind   /* $hind $rest[$ind] */
EOP
}

print OUT <<EOP;

#ifndef DOINIT
EXTCONST U8 PL_regkind[];
#else
EXTCONST U8 PL_regkind[] = {
EOP

$ind = 0;
while (++$ind <= $tot) {
  print OUT <<EOP;
        $type[$ind],            /* $name[$ind] */
EOP
}

print OUT <<EOP;
};
#endif


#ifdef REG_COMP_C
static const U8 regarglen[] = {
EOP

$ind = 0;
while (++$ind <= $tot) {
  $size = 0;
  $size = "EXTRA_SIZE(struct regnode_$args[$ind])" if $args[$ind];
  
  print OUT <<EOP;
        $size,          /* $name[$ind] */
EOP
}

print OUT <<EOP;
};

static const char reg_off_by_arg[] = {
EOP

$ind = 0;
while (++$ind <= $tot) {
  $size = $longj[$ind] || 0;

  print OUT <<EOP;
        $size,          /* $name[$ind] */
EOP
}

print OUT <<EOP;
};

#ifdef DEBUGGING
static const char * const reg_name[] = {
EOP

$ind = 0;
while (++$ind <= $tot) {
  $hind = sprintf "%#4x", $ind-1;
  $size = $longj[$ind] || 0;

  print OUT <<EOP;
        "$name[$ind]",          /* $hind */
EOP
}

print OUT <<EOP;
};

static const int reg_num = $tot;

#endif /* DEBUGGING */
#endif /* REG_COMP_C */

/* ex: set ro: */
EOP

close OUT or die "close $tmp_h: $!";

safer_rename $tmp_h, 'regnodes.h';