### Class Gate: Create a generic gate file ####################################

BEGIN {
    package Gate;

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

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

      if ($self->{PROTO}) {
          print "/* Automatically generated header (sfdc SFDC_VERSION)! Do not edit! */\n";
          print "\n";
          print "#ifndef _GATEPROTO_$$sfd{'BASENAME'}_H\n";
          print "#define _GATEPROTO_$$sfd{'BASENAME'}_H\n";
      }
      elsif ($self->{LIBPROTO}) {
          print "/* Automatically generated header (sfdc SFDC_VERSION)! Do not edit! */\n";
          print "\n";
          print "#ifndef _LIBPROTO_$$sfd{'BASENAME'}_H\n";
          print "#define _LIBPROTO_$$sfd{'BASENAME'}_H\n";
      }
      else {
          print "/* Automatically generated gatestubs (sfdc SFDC_VERSION)! Do not edit! */\n";
      }
      print "\n";

      foreach my $inc (@{$$sfd{'includes'}}) {
          print "#include $inc\n";
      }

      foreach my $td (@{$$sfd{'typedefs'}}) {
          print "typedef $td;\n";
      }

      print "\n";
      print "#define _sfdc_strarg(a) _sfdc_strarg2(a)\n";
      print "#define _sfdc_strarg2(a) #a\n";

      print "\n";
      print "#ifdef __cplusplus\n";
      print "extern \"C\" {\n";
      print "#endif /* __cplusplus */\n";
      print "\n";
    }

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

      if ($prototype->{type} eq 'function') {
          $self->function_proto (prototype => $prototype);
          $self->function_start (prototype => $prototype);
          for my $i (0 .. $$prototype{'numargs'} - 1 ) {
            $self->function_arg (prototype => $prototype,
                             argtype   => $$prototype{'argtypes'}[$i],
                             argname   => $$prototype{'___argnames'}[$i],
                             argreg    => $$prototype{'regs'}[$i],
                             argnum    => $i );
          }
          $self->function_end (prototype => $prototype);
          print "\n";
      }
      elsif ($prototype->{type} eq 'cfunction') {
          $self->function_proto (prototype => $prototype);

          if (!$self->{LIBPROTO}) {
            print_gateproto ($sfd, $prototype);
            print ";\n\n";
          }

          if (!$self->{PROTO} && !$self->{LIBPROTO}) {
            print "__asm(\".globl \" _sfdc_strarg(" .
                "$gateprefix$prototype->{funcname}) );\n";
            print "__asm(\".type  \" _sfdc_strarg(" .
                "$gateprefix$prototype->{funcname}) \"" .
                ", \@function\");\n";
            print "__asm(_sfdc_strarg(".
                "$gateprefix$prototype->{funcname}) \":\");\n";
            print "#if defined(__mc68000__) || defined(__i386__)\n";
            print "__asm(\"jmp $libprefix$prototype->{funcname}\");\n";
            print "#else\n";
            print "# error \"Unknown CPU\"\n";
            print "#endif\n";
            print "\n";
          }
      }
    }

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

      print "\n";
      print "#ifdef __cplusplus\n";
      print "}\n";
      print "#endif /* __cplusplus */\n";

      if ($self->{PROTO}) {
          print "\n";
          print "#endif /* _GATEPROTO_$$sfd{'BASENAME'}_H */\n";
      }
      elsif ($self->{LIBPROTO}) {
          print "\n";
          print "#endif /* _LIBPROTO_$$sfd{'BASENAME'}_H */\n";
      }
    }


    # Helper functions
    sub function_proto {
      my $self     = shift;
      my %params   = @_;
      my $prototype = $params{'prototype'};
      my $sfd      = $self->{SFD};

      if (!$self->{PROTO} and $sdi eq 0) {
          if ($prototype->{type} eq 'varargs') {
            print_libproto($sfd, $prototype->{real_prototype});
          }
          else {
            print_libproto($sfd, $prototype);
          }
          print ";\n\n";
      }
    }

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

      if (!$self->{LIBPROTO}) {
          print_gateproto ($sfd, $prototype);
      }
      if ($self->{PROTO}) {
          print ";\n";
      }
      elsif (!$self->{LIBPROTO}) {
          print "\n";
          print "{\n";
          print "  return $libprefix$prototype->{funcname}(";

          if ($libarg eq 'first' && !$prototype->{nb}) {
            print "_base";
            print $prototype->{numargs} > 0 ? ", " : "";
          }
      }
    }

    sub function_arg {
      my $self      = shift;

      if (!$self->{PROTO} && !$self->{LIBPROTO}) {
          my %params    = @_;
          my $argname   = $params{'argname'};
          my $argnum    = $params{'argnum'};

          print $argnum > 0 ? ", " : "";
          print $argname;
      }
    }

    sub function_end {
      my $self      = shift;
      if (!$self->{PROTO} && !$self->{LIBPROTO}) {
          my %params    = @_;
          my $prototype = $params{'prototype'};
          my $sfd       = $self->{SFD};
          if ($libarg eq 'last' && !$prototype->{nb}) {
            print $prototype->{numargs} > 0 ? ", " : "";
            print "_base";
          }
          print ");\n";
          print "}\n";
      }
    }


    sub print_gateproto {
      my $sfd       = shift;
      my $prototype = shift;
      print "$prototype->{return}\n";
      print "$gateprefix$prototype->{funcname}(";

      if ($libarg eq 'first' && !$prototype->{nb}) {
          print "$sfd->{basetype} _base";
          print $prototype->{numargs} > 0 ? ", " : "";
      }
      print join (', ', @{$prototype->{___args}});

      if ($libarg eq 'last' && !$prototype->{nb}) {
          print $prototype->{numargs} > 0 ? ", " : "";
          print "$sfd->{basetype} _base";
      }

      if ($libarg eq 'none' && $prototype->{numargs} == 0) {
          print "void";
      }

      print ")";
    }

    sub print_libproto {
      my $sfd       = shift;
      my $prototype = shift;
      my $rettype_prefix = $prototype->{return};
      my $rettype_postfix = "";
      if ($prototype->{return} =~ /(.*\(\*+)(\).*)/) {
        $rettype_prefix = $1;
        $rettype_postfix = $2;
      }

      print "$rettype_prefix ";
      print "$libprefix$prototype->{funcname}(";

      if ($libarg eq 'first' && !$prototype->{nb}) {
          print "$sfd->{basetype} _base";
      }

      for my $i (0 .. $prototype->{numargs} - 1 ) {
        my $argtype = $$prototype{'argtypes'}[$i];
        my $argname = $$prototype{'___argnames'}[$i];
        if($argtype eq "va_list") {
          $argtype = "long *";
        }
        my $argdef = $argtype . " " . $argname;
        if ($argtype =~ /\(\*+\)/) {
          $argdef = $argtype;
          $argdef =~ s/\(\*+\)/\(\*$argname\)/g;
        }

        print ", $argdef";
      }

      if ($libarg eq 'last' && !$prototype->{nb}) {
          print $prototype->{numargs} > 0 ? ", " : "";
          print "$sfd->{basetype} _base";
      }

      if ($libarg eq 'none' && $prototype->{numargs} == 0) {
          print "void";
      }
      print ")" . $rettype_postfix;
    }
}