#!/usr/bin/perl

use Getopt::Long;
use Mysql;

use Env qw(LSBUSER LSBDBPASSWD LSBDB LSBDBHOST);

# Uncomment to trace SQL statments
#$trace=1;

$funcptrname="";

sub
usage()
{
die "mkdatadef -h <headername> -a <archname>";
}

sub
displaytype($$)
{
local ($type,$nameonly) = @_;
local (*entry,*tentry,*tmentry);
local($th);
local($tmh);

#print $$type{'Tname'};
#print $$type{'Ttype'};
#if( $$type{'Tname'} =~ "anon" ) { return; }

#switch ($ttype{'Ttype'})

# handle opaque types better ...
if ($nameonly && $$type{'Ttype'} eq "") {
	print $$type{'Tname'}; 
	return; 
}
if( $$type{'Ttype'} eq "Intrinsic" ) {
	print $$type{'Tname'}."\t";
	return;
	}

if( $$type{'Ttype'} eq "Literal" ) {
	print $$type{'Tname'}."\t";
	return;
	}

if( $$type{'Ttype'} eq "Volatile" ) {
	$select = "SELECT * FROM Type WHERE Tid=".$$type{'Tbasetype'};
	$sth = $Dbh->query($select) || die $Dbh->errmsg();
	%type=$sth->fetchhash;
	if( $type{'Ttype'} eq "Pointer" ) {
		displaytype(\%type,$nameonly);
		print "volatile ";
	} else {
		print "volatile ";
		displaytype(\%type,$nameonly);
	}
	return;
	}
	
if( $$type{'Ttype'} eq "Const" ) {
	$select = "SELECT * FROM Type WHERE Tid=".$$type{'Tbasetype'};
	$sth = $Dbh->query($select) || die $Dbh->errmsg();
	%type=$sth->fetchhash;
	if( $type{'Ttype'} eq "Pointer" ) {
		displaytype(\%type,$nameonly);
		print "const ";
	} else {
		print "const ";
		displaytype(\%type,$nameonly);
	}
	return;
	}

if( $$type{'Ttype'} eq "Typedef" ) {
	if (!$nameonly) { print "typedef "; }
	$basetype=$$type{'Tbasetype'};
	$tselect="SELECT * FROM Type ";
	$tselect.= "LEFT JOIN ArchType ON ATaid=Tarch AND ATtid=Tid ";
	$tselect.= "LEFT JOIN TypeMember ON TMtypeid=Tid ";
	$tselect.= "WHERE Tid=$basetype";
	$tth = $Dbh->query($tselect) || die $Dbh->errmsg();
	%entry=$tth->fetchhash;
# Something about anon or not & wether to set nameonly
	if (!$nameonly) {
		if( ( $entry{'Ttype'} eq 'Typedef' ||
		    $entry{'Ttype'} eq 'FuncPtr' ) ||
		    $entry{'Theadergroup'} != $HGid ) {
			$funcPtrName=$$type{'Tname'};
			displaytype(\%entry,1);
		} else {
			displaytype(\%entry,$nameonly);
			}
		}
	if( $entry{'Ttype'} ne 'FuncPtr' || $nameonly ) {
		print $$type{'Tname'}."\t";
		}
	if( $entry{'Ttype'} eq 'Array' && $nameonly==0) {
		my $bound = $entry{'TMarray'};
		$bound ||= $entry{'ATsize'};
		print "[".$bound."]";
		}
	if( !$nameonly && $$type{'Tattribute'} ) {
		print "__attribute__ (".$$type{'Tattribute'}.")";
		}
	return;
	}

if( $$type{'Ttype'} eq "Pointer" ) {
	$basetype=$$type{'Tbasetype'};
	$tselect="SELECT * FROM Type WHERE Tid=$basetype";
	$tth = $Dbh->query($tselect) || die $Dbh->errmsg();
	%entry=$tth->fetchhash;
	if (!$nameonly) {
		if( $entry{'Ttype'} eq 'Typedef' ||
		    $entry{'Ttype'} eq 'FuncPtr' ) {
			displaytype(\%entry,1);
		}else {
            if (($entry{'Ttype'} eq 'Struct' ||
            $entry{'Ttype'} eq 'Union') ) {
               displaytype(\%entry,1);
			} else {
				displaytype(\%entry,0);
			}
		}
		print "* ";
	} else {
		displaytype(\%entry,1);
		print "* ";
	}
	return;
	}

if( $$type{'Ttype'} eq "Struct" ) {
	print "struct ";

	if( $$type{'Tname'} =~ "anon" ) {
		$$type{'Tname'} ="";
		$nameonly = 0;
		}
	print $$type{'Tname'}."\t";
	$Tid=$$type{'Tid'};
	if( $nameonly ) { return; }
	#print $$type{'Tcomment'}."\n";

	$tmselect = "SELECT * FROM TypeMember ";
	#$tmselect.= "LEFT JOIN ArchTypeMem ON ATMtmid = TMid ";
	#$tmselect.= "LEFT JOIN Architecture ON ATMaid = Aid ";
	$tmselect.= "WHERE TMmemberof=$Tid ";
	$tmselect.= "ORDER BY TMposition";
	$tmh = $Dbh->query($tmselect) || die $Dbh->errmsg();
	if ($tmh->numrows ) { print "{\n"; }
	for(1..$tmh->numrows) {
		%tmentry=$tmh->fetchhash;
		$TMtypeid=$tmentry{'TMtypeid'};
		$tselect  = "SELECT * FROM Type ";
		$tselect .= "LEFT JOIN ArchType ON ATaid=Tarch AND ATtid=Tid ";
		# $tselect.= "LEFT JOIN TypeMember ON TMtypeid=Tid ";
		$tselect .= "WHERE Tid=$TMtypeid";
		$th = $Dbh->query($tselect) || die $Dbh->errmsg();
		%entry=$th->fetchhash;
		$funcPtrName=$tmentry{'TMname'};
		displaytype(\%entry,1);
		if( $entry{'Ttype'} ne 'FuncPtr' ) {
			print $tmentry{'TMname'};
			}
		if( $entry{'Ttype'} eq 'Array' ) {
			if($tmentry{'TMarray'}){
                            print "[".$tmentry{'TMarray'}."]";
			}else {
			# check the basetype of this array
                       $tselect="SELECT * FROM Type ";
                       $tselect.= "LEFT JOIN ArchType ON ATaid=Tarch AND ATtid=Tid ";
                       $tselect.="WHERE Tid=$entry{'Tbasetype'}";
                       $tth = $Dbh->query($tselect) || die $Dbh->errmsg();
                       %bentry=$tth->fetchhash;
                       if ($bentry{'Ttype'} eq 'Array') {
                            print "[".$bentry{'ATsize'}."]"."[".$entry{'ATsize'}."]";
                       } else {
                            print "[".$entry{'ATsize'}."]";
	              		}
			}
		 }	
		if( $tmentry{'TMbitfield'} != 0 ) {
			print ":".$tmentry{'TMbitfield'};
			}
		print ";\t";
		#if( $tmentry{'TMcomment'} ) {
		#	print "/* ".$tmentry{'TMcomment'}." */";
		#	}
		print "\n";
		# $nameonly=0;
		}
	if ($tmh->numrows ) { print "}"; }
	if( $$type{'Tattribute'} ) {
		print "__attribute__ (".$$type{'Tattribute'}.")";
		}
	print "\n";
	return;
	}

if( $$type{'Ttype'} eq "Union" ) {
	print "union ";

	if( $$type{'Tname'} =~ "anon" ) {
		$$type{'Tname'} ="";
		$nameonly = 0;
		}
	print $$type{'Tname'}."\t";
	$Tid=$$type{'Tid'};
	if( $nameonly ) { return; }
	#print $$type{'Tcomment'}."\n";

	$tmselect="SELECT * FROM TypeMember WHERE TMmemberof=$Tid";
	$tmselect.=" ORDER BY TMposition";
	$tmh = $Dbh->query($tmselect) || die $Dbh->errmsg();
	if ($tmh->numrows ) { print "{\n"; }
	for(1..$tmh->numrows) {
		%tmentry=$tmh->fetchhash;
		$TMtypeid=$tmentry{'TMtypeid'};
		$tselect ="SELECT * FROM Type ";
		$tselect.="LEFT JOIN ArchType ON ATaid=Tarch AND ATtid=Tid ";
		$tselect.="WHERE Tid=$TMtypeid";
		$th = $Dbh->query($tselect) || die $Dbh->errmsg();
		%entry=$th->fetchhash;
		$funcPtrName=$tmentry{'TMname'};
		displaytype(\%entry,1);
		if( $entry{'Ttype'} ne 'FuncPtr' ) {
			print $tmentry{'TMname'};
			}
		if( $entry{'Ttype'} eq 'Array' ) {
			if($tmentry{'TMarray'}){
                            print "[".$tmentry{'TMarray'}."]";
			}else {
			# check the basetype of this array
                       $tselect="SELECT * FROM Type ";
                       $tselect.= "LEFT JOIN ArchType ON ATaid=Tarch AND ATtid=Tid ";
                       $tselect.="WHERE Tid=$entry{'Tbasetype'}";
                       $tth = $Dbh->query($tselect) || die $Dbh->errmsg();
                       %bentry=$tth->fetchhash;
                       if ($bentry{'Ttype'} eq 'Array') {
                            print "[".$bentry{'ATsize'}."]"."[".$entry{'ATsize'}."]";
                       } else {
                            print "[".$entry{'ATsize'}."]";
	              		}
			}
		 }
		print ";\t";
		#if( $tmentry{'TMcomment'} ) {
		#	print "/* ".$tmentry{'TMcomment'}." */";
		#	}
		print "\n";
		# $nameonly=0;
		}
	if ($tmh->numrows ) { print "}\n"; }
	return;
	}

if( $$type{'Ttype'} eq "Enum" ) {
	print "enum ";
	$Tid=$$type{'Tid'};
	if( $$type{'Tname'} =~ "anon" ) {
		$$type{'Tname'} ="";
		}
	print $$type{'Tname'}."\t";
	if( $nameonly ) { return; }
	#print $$type{'Tcomment'}."\n";

	$tmselect="SELECT * FROM TypeMember WHERE TMmemberof=$Tid";
	$tmselect.=" ORDER BY TMposition";
	$tmh = $Dbh->query($tmselect) || die $Dbh->errmsg();
	if ($tmh->numrows ) { print "{\n"; }
	for(1..$tmh->numrows) {
		%tmentry=$tmh->fetchhash;
		# It's an enum, don't print out the types, just the names
		#$TMtypeid=$tmentry{'TMtypeid'};
		#$tselect="SELECT * FROM Type WHERE Tid=$TMtypeid";
		#$th = $Dbh->query($tselect) || die $Dbh->errmsg();
		#%entry=$th->fetchhash;
		#$nameonly=1;
		#displaytype(\%entry,1);
		print $tmentry{'TMname'};
		if( $tmentry{'TMarray'} ne '' ) {
			print " = ".$tmentry{'TMarray'};
			}
		if( $_ != $tmh->numrows ) {
			print ",\n";
			}
		#print $tmentry{'TMcomment'}."\n";
		# $nameonly=0;
		}
	if ($tmh->numrows ) { print "}\n"; }
	return;
	}

if( $$type{'Ttype'} eq "FuncPtr" ) {
	$basetype=$$type{'Tbasetype'};
	$tselect="SELECT * FROM Type WHERE Tid=$basetype";
	$tth = $Dbh->query($tselect) || die $Dbh->errmsg();
	%entry=$tth->fetchhash;
	displaytype(\%entry,1);
	print "(*"; 
	$Tid=$$type{'Tid'};
#	if( $$type{'Tname'} =~ "fptr" ) {
#		$$type{'Tname'} =~ s/fptr-//;
#		}
#	print $$type{'Tname'}.")";
	print $funcPtrName.")";
	print $$type{'Tcomment'}."(";

	$tmselect="SELECT * FROM TypeMember WHERE TMmemberof=$Tid";
	$tmselect.=" ORDER BY TMposition";
	$tmh = $Dbh->query($tmselect) || die $Dbh->errmsg();
	if($tmh->numrows == 0) {
		print "void";
		}
	for(1..$tmh->numrows) {
		%tmentry=$tmh->fetchhash;
		$TMtypeid=$tmentry{'TMtypeid'};
		$tselect ="SELECT * FROM Type ";
		$tselect.="LEFT JOIN ArchType ON ATaid=Tarch AND ATtid=Tid ";
		$tselect.= "LEFT JOIN TypeMember ON TMtypeid=Tid ";
		$tselect.="WHERE Tid=$TMtypeid";
		$th = $Dbh->query($tselect) || die $Dbh->errmsg();
		%entry=$th->fetchhash;
		displaytype(\%entry,1);
		print $tmentry{'TMname'};
		if( $tmentry{'Ttype'} eq 'Array' ) {	
			if($tmentry{'TMarray'}){
                            print "[".$tmentry{'TMarray'}."]";
			}else {
			# check the basetype of this array
                       $tselect="SELECT * FROM Type ";
                       $tselect.= "LEFT JOIN ArchType ON ATaid=Tarch AND ATtid=Tid ";
                       $tselect.="WHERE Tid=$entry{'Tbasetype'}";
                       $tth = $Dbh->query($tselect) || die $Dbh->errmsg();
                       %bentry=$tth->fetchhash;
                       if ($bentry{'Ttype'} eq 'Array') {
                            print "[".$bentry{'ATsize'}."]"."[".$entry{'ATsize'}."]";
                       } else {
                            print "[".$entry{'ATsize'}."]";
	              		}

			}
		}
		if( $_ != $tmh->numrows ) {
			print ",";
			}
		}
	print ")\n";
	return;
	}

if( $$type{'Ttype'} eq "Array" ) {
	$basetype=$$type{'Tbasetype'};
	$tselect="SELECT * FROM Type WHERE Tid=$basetype";
	$tth = $Dbh->query($tselect) || die $Dbh->errmsg();
	%entry=$tth->fetchhash;
	displaytype(\%entry,1);
#	if( $$type{'Tname'} =~ "fptr" ) {
#		$$type{'Tname'} =~ s/fptr-//;
#		}
	#print $$type{'Tname'};
	#print "[".$$type{'Tsize'}."]";
	return;
	}

print "Unknown Type: \"$$type{'Ttype'}\"\n";
print STDERR "Unknown Type: \"$$type{'Ttype'}\" for Tid $$type{'Tid'}\n";
exit 2;
}

sub
displayconstant($)
{
local ($const) = @_;

print "#define ";
print $$const{'Cname'};
print "\t";
if( $$const{'Ctype'} eq 'string' ) {
	print "\"".$$const{'ACvalue'}."\"";
} else {
	print $$const{'ACvalue'};
}
print "\n";
}

GetOptions("h=s" => \$headname,
	   "a=s" => \$archname);
 
if( !$headname ) { usage(); }  
if( !$archname ) { usage(); }  

$headname =~ s/^\.\///;

$Dbh = Mysql->connect($LSBDBHOST,$LSBDB,$LSBUSER, $LSBDBPASSWD) || die $Mysql::db_errstr;

#
# Get the Architecture id
#
$select = "SELECT Aid FROM Architecture WHERE Aname='$archname'";
print $select,"\n" if $trace;
$sth = $Dbh->query($select) || die $Dbh->errmsg();

if( !$sth->numrows ) { exit 0; }
%entry=$sth->fetchhash;
$Aid=$entry{'Aid'};

#
# Get the Header id
#
$select = "SELECT Hid FROM Header WHERE Hname='$headname'";
print $select,"\n" if $trace;
$sth = $Dbh->query($select) || die $Dbh->errmsg();

if( !$sth->numrows ) { exit 0; }
%entry=$sth->fetchhash;
$Hid=$entry{'Hid'};

#
# Get the return types
#
$select = "SELECT Ireturn FROM Interface ";
$select.= "WHERE Iheader=$Hid ";
$select.= "AND ( Istatus='Included' OR Istatus='Deprecated' ) ";
$select.= "AND Iarch=$Aid";
print $select,"\n" if $trace;
$sth = $Dbh->query($select) || die $Dbh->errmsg();
for(1..$sth->numrows) {
	%entry=$sth->fetchhash;
	$type{$entry{'Ireturn'}}=1;
	}

#
# Get the parameter types
#
$select = "SELECT Ptype FROM Interface,Parameter ";
$select.= "WHERE Iheader=$Hid ";
$select.= "AND Pint=Iid ";
#$select.= "WHERE Pint=Iid ";
$select.= "AND ( Istatus='Included' OR Istatus='Deprecated' ) ";
$select.= "AND Iarch=$Aid";
print $select,"\n" if $trace;
$sth = $Dbh->query($select) || die $Dbh->errmsg();
for(1..$sth->numrows) {
	%entry=$sth->fetchhash;
	$type{$entry{'Ptype'}}=1;
	}

#
# Get any other type that is assigned to this header
#
$select = "SELECT Tid,Tname FROM Type ";
$select.= "LEFT JOIN HeaderGroup ON Theadergroup=HGid ";
$select.= "WHERE HGheader=$Hid ";
$select.= "AND Tstatus != 'Excluded' ";
print $select,"\n" if $trace;
$sth = $Dbh->query($select) || die $Dbh->errmsg();
for(1..$sth->numrows) {
	%entry=$sth->fetchhash;
	$type{$entry{'Tid'}}=1;
	#print "Type ".$entry{'Tname'}."\n";
	}

$typelist=join ',', keys(%type);

#
# Get the base types of Typedefs
#

if( $typelist ne "" ) { 
	$select = "SELECT Tbasetype,Tname FROM Type ";
	$select.= "WHERE Tid IN ($typelist) ";
	$select.= "AND Ttype = 'Typedef' ";
	print $select,"\n" if $trace;
	$sth = $Dbh->query($select) || die $Dbh->errmsg();
	for(1..$sth->numrows) {
		%entry=$sth->fetchhash;
		$type{$entry{'Tbasetype'}}=1;
		}
	}

$typelist=join ',', keys(%type);

#
# Get the base types of Pointers
#

if( $typelist ne "" ) { 
	$select = "SELECT Tbasetype,Tname FROM Type ";
	$select.= "WHERE Tid IN ($typelist) ";
	$select.= "AND Ttype = 'Pointer' ";
	print $select,"\n" if $trace;
	$sth = $Dbh->query($select) || die $Dbh->errmsg();
	for(1..$sth->numrows) {
		%entry=$sth->fetchhash;
		$type{$entry{'Tbasetype'}}=1;
		#print "Pointer ".$entry{'Tname'}."\n";
		}
	}

$typelist=join ',', keys(%type);

#
# Get the base types of Struct/Union members
#

if( $typelist ne "" ) { 
	$select = "SELECT TMtypeid,TMname FROM TypeMember ";
	$select.= "WHERE TMmemberof IN ($typelist)";
	print $select,"\n" if $trace;
	$sth = $Dbh->query($select) || die $Dbh->errmsg();
	for(1..$sth->numrows) {
		%entry=$sth->fetchhash;
		$type{$entry{'TMtypeid'}}=1;
		#print "TypeMember ".$entry{'TMname'}."\n";
		}
	}

$typelist=join ',', keys(%type);

#
# Get the info from the types in the $type hash
#
# Use the algorithm from admin/headers.php3

$select = "SELECT HGid,HGdescription,HGorder FROM HeaderGroup ";
$select.= "WHERE HGheader=$Hid ";
$select.= "ORDER BY HGorder";
print $select,"\n" if $trace;
$hgh = $Dbh->query($select) || die $Dbh->errmsg();
print $hgh->numrows," rows\n" if $trace;
$totrows = 0;
for(1..$hgh->numrows) {
	%entry=$hgh->fetchhash;
	$HGid=$entry{'HGid'};
	$HGdesc=$entry{'HGdescription'};
	$HGorder=$entry{'HGorder'};
	# Make sure a blank line is present between every group
	print "\n";

	# Display the Constants
	$select = "SELECT * FROM Constant ";
	$select.= "LEFT JOIN ArchConst ON Cid=ACcid ";
	
	$select.= "WHERE Cheadgroup=$HGid ";
	$select.= "AND ACaid=$Aid ";
	$select.= "AND Cstd ='Yes' ";
	$select.=" ORDER BY ACvalue, Cname, ACaid";
	$ch = $Dbh->query($select) || die $Dbh->errmsg();
	print $ch->numrows," rows\n" if $trace;
	for(1..$ch->numrows) {
		%centry=$ch->fetchhash;
		displayconstant(\%centry);
		$totrows++;
		}
	print "\n\n";
	
	# Display the Types
	$select = "SELECT * FROM Type ";
	$select.= "LEFT JOIN Architecture ON Tarch=Aid ";
	$select.= "LEFT JOIN ArchType ON ATaid=Aid AND ATtid=Tid ";
	$select.= "WHERE Theadergroup=$HGid ";
	$select.= "AND ( Tstatus = 'Referenced' OR Tstatus = 'Conly' )";
	$select.= "AND Tarch = $Aid ";
	$select.= "ORDER BY Tid";
	print $select,"\n" if $trace;
	$th = $Dbh->query($select) || die $Dbh->errmsg();
	print $th->numrows," rows\n" if $trace;
	for(1..$th->numrows) {
		%tentry=$th->fetchhash;
		if( $tentry{'Aid'} && $tentry{'Aname'} eq "None" ) { next; }
		displaytype(\%tentry,0);
		print ";\n";
		$totrows++;
		#print $tentry{'Tcomment'}."\n\n";
		}
	}
#
# now dump out the function prototypes --- see bug 1089
# while it is questionable if these are really part of "Data Definitions",
# it can be argued that they are, and that including them increases
# readability ...
#
$select  = "SELECT * from Interface ";
$select .= "LEFT JOIN Type on Ireturn = Tid ";
$select .= "WHERE Iheader = $Hid AND ";
$select .= "Iarch = $Aid AND ";
$select .= "Istatus in ('Included','Deprecated')";
print $select,"\n" if $trace;
$eh = $Dbh->query($select) || die $Dbh->errmsg();
for (1..$eh->numrows) {
	%eentry=$eh->fetchhash;
	next if ($eentry{'Iname'} =~ m/^_Z.*/);	# skip C++ names
	
	if( $eentry{'Itype'} eq "Function" ) {
		printf "extern ";
		displaytype(\%eentry,1);
		printf "%s(\n", $eentry{'Iname'};
		$select  = "SELECT * FROM Parameter ";
		$select .= "LEFT JOIN Type on Ptype=Tid ";
		$select .= "WHERE Pint=$eentry{'Iid'} ";
		$select .= "ORDER BY Ppos";
		print $select,"\n" if $trace;
		$ph = $Dbh->query($select) || die $Dbh->errmsg();
		$moreargs = 0;
		if ($ph->numrows) {
			for (1..$ph->numrows) {
				%pentry = $ph->fetchhash;
				printf ", " if ($moreargs++);
				displaytype(\%pentry,1);
			}
		} else {
			printf "void";
		}
		printf ");\n";
	} 
	if( $eentry{'Itype'} eq "Data" ) {
		printf "extern ";
		displaytype(\%eentry, 1);
		printf " %s",$eentry{'Iname'};
		if( $eentry{'Ttype'} eq "Array" ) {
			print "[";
			if( $eentry{'ATsize'} != 0 ) {
				print $eentry{'ATsize'};
				}
			print "]";
		}
       if( $eentry{'Ttype'} eq "Const" || $eentry{'Ttype'} eq "Volatile") {
            $select = "SELECT * FROM Type ";
            $select.= "LEFT JOIN ArchType ON ATtid=Tid AND ATaid=Tarch ";
	        $select.= "LEFT JOIN Architecture ON Tarch=Aid ";
	        $select.= "WHERE Tid=".$eentry{'Tbasetype'};
	        print $select,"\n" if $trace;
	        my $stm = $Dbh->query($select) || die $Dbh->errmsg();
            my %btype=$stm->fetchhash;
            if( $btype{'Ttype'} eq "Array" ) {
               print "[";
               if( $btype{'ATsize'} != 0 ) {
                  print $btype{'ATsize'};
               }
               print "]";
            }
	   }
	   
		printf " ;\n";
	}
	if( $eentry{'Itype'} eq "Alias" ) {
		printf "extern ";
		displaytype(\%eentry, 1);
		printf " %s",$eentry{'Iname'};
		if( $eentry{'Ttype'} eq "Array" ) {
			print "[";
			if( $eentry{'ATsize'} != 0 ) {
				print $eentry{'ATsize'};
				}
			print "]";
		}
		printf " ;\n";
	}
	if( $eentry{'Itype'} eq "Common" ) {
		printf "extern ";
		displaytype(\%eentry, 1);
		printf " %s",$eentry{'Iname'};
		if( $eentry{'Ttype'} eq "Array" ) {
			print "[";
			if( $eentry{'ATsize'} != 0 ) {
				print $eentry{'ATsize'};
				}
			print "]";
		}
		printf " ;\n";
	}
	$totrows++;
}
if($totrows == 0) {
	#
	# one of two things ....
	# either there was no data for this architecture, 
	# or there's no data at all (its a header associated entirely
	# with interfaces/constants that are not part of the LSB)
	#
	# Check to see if there is ANY data ... same queries, but not arch
	# dependant
	#
	# if HGid is not defined, then this is a bogus header.
	#
	if(!defined($HGid)) {
		exit 0;
	}
	$select = "SELECT * FROM Constant ";
	$select.= "LEFT JOIN ArchConst ON Cid=ACcid ";
	$select.= "WHERE Cheadgroup=$HGid ";
	$select.= "AND Cstd ='Yes'";
	print STDERR $select,"\n" if $trace;
	$ch = $Dbh->query($select) || die $Dbh->errmsg();
	if ($ch->numrows == 0) {
		$select = "SELECT * FROM Type ";
		$select.= "LEFT JOIN Architecture ON Tarch=Aid ";
		$select.= "LEFT JOIN ArchType ON ATaid=Aid AND ATtid=Tid ";
		$select.= "WHERE Theadergroup=$HGid ";
		$select.= "AND ( Tstatus = 'Referenced' OR Tstatus = 'Conly' )";
		print STDERR $select,"\n" if $trace;
		$th = $Dbh->query($select) || die $Dbh->errmsg();
		if ($th->numrows == 0) {
			exit 0;
		}
	}
	printf "/*\n";
	printf " * This header is architecture %s\n", 
		$Aid == 1 ? "dependent" : "neutral";
	printf " * Please refer to the %s specification for details\n",
		$Aid == 1 ? "specific architecture" : "generic";
	printf " */\n";
}
