### Class FD: Create an old-style FD file #####################################

BEGIN {
    package FD;

    sub new {
      my $proto  = shift;
      my %params = @_;
      my $class  = ref($proto) || $proto;
      my $self   = {};
      $self->{SFD}     = $params{'sfd'};
      $self->{BIAS}    = -1;
      $self->{PRIVATE} = -1;
      $self->{VERSION} = 1;
      bless ($self, $class);
      return $self;
    }

    sub header {
      my $self = shift;
      my $sfd  = $self->{SFD};

      print "* \"$$sfd{'libname'}\"\n";
      print "* Automatically generated FD (sfdc SFDC_VERSION)! Do not edit!\n";
      print "##base _$$sfd{'base'}\n";
      $self->{BIAS}    = -1;
      $self->{PRIVATE} = -1;
      $self->{VERSION} = 1;
    }

    sub function {
      my $self      = shift;
      my %params    = @_;
      my $prototype = $params{'prototype'};
      my $sfd       = $self->{SFD};

      if ($prototype->{type} eq 'function' ||
          $prototype->{type} eq 'cfunction') {
          if ($self->{BIAS} != $$prototype{'bias'}) {
            $self->{BIAS} = $$prototype{'bias'};
            print "##bias $self->{BIAS}\n";
          }

          if ($self->{PRIVATE} != $$prototype{'private'}) {
            $self->{PRIVATE} = $$prototype{'private'};
            print $self->{PRIVATE} == 1 ? "##private\n" : "##public\n";
          }

          if ($self->{VERSION} != $$prototype{'version'}) {
            $self->{VERSION} = $$prototype{'version'};

            print "*--- functions in V$self->{VERSION} or higher ---\n";
          }

          if ($$prototype{'comment'} ne '') {
            my $comment = $$prototype{'comment'};

            $comment =~ s/^/\*/m;
            print "$comment\n";
          }
          print "$$prototype{'funcname'}(";
          print join (',', @{$$prototype{'argnames'}});
          print ")(";

          if ($prototype->{type} eq 'function') {
            print join (',', @{$$prototype{'regs'}});
          }
          elsif ($prototype->{type} eq 'cfunction') {
            print "base," unless $prototype->{nb};
            print "$prototype->{subtype}";
          }
          else {
            die;
          }
          print ")\n";
          $self->{BIAS} += 6;
      }
    }
    sub footer {
      my $self = shift;

      print "##end\n";
    }
}