syms

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

sizeof_1_ = 8;
aggr _1_
{
	'D' 0 hlength;
	'D' 4 llength;
};

defn
_1_(addr) {
	complex _1_ addr;
	print("	hlength	", addr.hlength, "\n");
	print("	llength	", addr.llength, "\n");
};

sizeof_2_ = 8;
aggr _2_
{
	'V' 0 length;
	{
	'D' 0 hlength;
	'D' 4 llength;
	};
};

defn
_2_(addr) {
	complex _2_ addr;
	print("	length	", addr.length, "\n");
	print("_1_ {\n");
		_1_(addr+0);
	print("}\n");
};

UTFmax = 3;
Runesync = 128;
Runeself = 128;
Runeerror = 128;
sizeofFconv = 24;
aggr Fconv
{
	'X' 0 out;
	'X' 4 eout;
	'D' 8 f1;
	'D' 12 f2;
	'D' 16 f3;
	'D' 20 chr;
};

defn
Fconv(addr) {
	complex Fconv addr;
	print("	out	", addr.out\X, "\n");
	print("	eout	", addr.eout\X, "\n");
	print("	f1	", addr.f1, "\n");
	print("	f2	", addr.f2, "\n");
	print("	f3	", addr.f3, "\n");
	print("	chr	", addr.chr, "\n");
};

sizeofTm = 40;
aggr Tm
{
	'D' 0 sec;
	'D' 4 min;
	'D' 8 hour;
	'D' 12 mday;
	'D' 16 mon;
	'D' 20 year;
	'D' 24 wday;
	'D' 28 yday;
	'a' 32 zone;
	'D' 36 tzoff;
};

defn
Tm(addr) {
	complex Tm addr;
	print("	sec	", addr.sec, "\n");
	print("	min	", addr.min, "\n");
	print("	hour	", addr.hour, "\n");
	print("	mday	", addr.mday, "\n");
	print("	mon	", addr.mon, "\n");
	print("	year	", addr.year, "\n");
	print("	wday	", addr.wday, "\n");
	print("	yday	", addr.yday, "\n");
	print("	zone	", addr.zone, "\n");
	print("	tzoff	", addr.tzoff, "\n");
};

PNPROC = 1;
PNGROUP = 2;
sizeofLock = 4;
aggr Lock
{
	'D' 0 val;
};

defn
Lock(addr) {
	complex Lock addr;
	print("	val	", addr.val, "\n");
};

sizeofQLp = 12;
aggr QLp
{
	'D' 0 inuse;
	'A' QLp 4 next;
	'C' 8 state;
};

defn
QLp(addr) {
	complex QLp addr;
	print("	inuse	", addr.inuse, "\n");
	print("	next	", addr.next\X, "\n");
	print("	state	", addr.state, "\n");
};

sizeofQLock = 16;
aggr QLock
{
	Lock 0 lock;
	'D' 4 locked;
	'A' QLp 8 $head;
	'A' QLp 12 $tail;
};

defn
QLock(addr) {
	complex QLock addr;
	print("Lock lock {\n");
	Lock(addr.lock);
	print("}\n");
	print("	locked	", addr.locked, "\n");
	print("	$head	", addr.$head\X, "\n");
	print("	$tail	", addr.$tail\X, "\n");
};

sizeofRWLock = 20;
aggr RWLock
{
	Lock 0 lock;
	'D' 4 readers;
	'D' 8 writer;
	'A' QLp 12 $head;
	'A' QLp 16 $tail;
};

defn
RWLock(addr) {
	complex RWLock addr;
	print("Lock lock {\n");
	Lock(addr.lock);
	print("}\n");
	print("	readers	", addr.readers, "\n");
	print("	writer	", addr.writer, "\n");
	print("	$head	", addr.$head\X, "\n");
	print("	$tail	", addr.$tail\X, "\n");
};

RFNAMEG = 1;
RFENVG = 2;
RFFDG = 4;
RFNOTEG = 8;
RFPROC = 16;
RFMEM = 32;
RFNOWAIT = 64;
RFCNAMEG = 1024;
RFCENVG = 2048;
RFCFDG = 4096;
RFREND = 8192;
sizeofQid = 8;
aggr Qid
{
	'U' 0 path;
	'U' 4 vers;
};

defn
Qid(addr) {
	complex Qid addr;
	print("	path	", addr.path, "\n");
	print("	vers	", addr.vers, "\n");
};

sizeofDir = 116;
aggr Dir
{
	'a' 0 name;
	'a' 28 uid;
	'a' 56 gid;
	Qid 84 qid;
	'U' 92 mode;
	'D' 96 atime;
	'D' 100 mtime;
	{
	'V' 104 length;
	{
	'D' 104 hlength;
	'D' 108 llength;
	};
	};
	'u' 112 type;
	'u' 114 dev;
};

defn
Dir(addr) {
	complex Dir addr;
	print("	name	", addr.name, "\n");
	print("	uid	", addr.uid, "\n");
	print("	gid	", addr.gid, "\n");
	print("Qid qid {\n");
	Qid(addr.qid);
	print("}\n");
	print("	mode	", addr.mode, "\n");
	print("	atime	", addr.atime, "\n");
	print("	mtime	", addr.mtime, "\n");
	print("_2_ {\n");
		_2_(addr+104);
	print("}\n");
	print("	type	", addr.type, "\n");
	print("	dev	", addr.dev, "\n");
};

sizeofWaitmsg = 112;
aggr Waitmsg
{
	'a' 0 pid;
	'a' 12 time;
	'a' 48 msg;
};

defn
Waitmsg(addr) {
	complex Waitmsg addr;
	print("	pid	", addr.pid, "\n");
	print("	time	", addr.time, "\n");
	print("	msg	", addr.msg, "\n");
};

DBlack = 255;
DBlue = 201;
DRed = 15;
DYellow = 3;
DGreen = 192;
DWhite = 0;
Displaybufsize = 8000;
ICOSSCALE = 1024;
Borderwidth = 4;
Refbackup = 0;
Refnone = 1;
Refmesg = 2;
Endsquare = 0;
Enddisc = 1;
Endarrow = 2;
Endmask = 31;
sizeofPoint = 8;
aggr Point
{
	'D' 0 x;
	'D' 4 y;
};

defn
Point(addr) {
	complex Point addr;
	print("	x	", addr.x, "\n");
	print("	y	", addr.y, "\n");
};

sizeofRectangle = 16;
aggr Rectangle
{
	Point 0 min;
	Point 8 max;
};

defn
Rectangle(addr) {
	complex Rectangle addr;
	print("Point min {\n");
	Point(addr.min);
	print("}\n");
	print("Point max {\n");
	Point(addr.max);
	print("}\n");
};

sizeofScreen = 16;
aggr Screen
{
	'X' 0 display;
	'D' 4 id;
	'X' 8 image;
	'X' 12 fill;
};

defn
Screen(addr) {
	complex Screen addr;
	print("	display	", addr.display\X, "\n");
	print("	id	", addr.id, "\n");
	print("	image	", addr.image\X, "\n");
	print("	fill	", addr.fill\X, "\n");
};

sizeofDisplay = 8156;
aggr Display
{
	QLock 0 qlock;
	'D' 16 dirno;
	'D' 20 fd;
	'D' 24 reffd;
	'D' 28 ctlfd;
	'D' 32 imageid;
	'D' 36 $local;
	'D' 40 ldepth;
	'X' 44 error;
	'X' 48 devdir;
	'X' 52 windir;
	'a' 56 oldlabel;
	'U' 120 dataqid;
	'X' 124 ones;
	'X' 128 zeros;
	'X' 132 image;
	'a' 136 buf;
	'X' 8140 bufp;
	'X' 8144 defaultfont;
	'X' 8148 defaultsubfont;
	'X' 8152 windows;
};

defn
Display(addr) {
	complex Display addr;
	print("QLock qlock {\n");
	QLock(addr.qlock);
	print("}\n");
	print("	dirno	", addr.dirno, "\n");
	print("	fd	", addr.fd, "\n");
	print("	reffd	", addr.reffd, "\n");
	print("	ctlfd	", addr.ctlfd, "\n");
	print("	imageid	", addr.imageid, "\n");
	print("	$local	", addr.$local, "\n");
	print("	ldepth	", addr.ldepth, "\n");
	print("	error	", addr.error\X, "\n");
	print("	devdir	", addr.devdir\X, "\n");
	print("	windir	", addr.windir\X, "\n");
	print("	oldlabel	", addr.oldlabel, "\n");
	print("	dataqid	", addr.dataqid, "\n");
	print("	ones	", addr.ones\X, "\n");
	print("	zeros	", addr.zeros\X, "\n");
	print("	image	", addr.image\X, "\n");
	print("	buf	", addr.buf, "\n");
	print("	bufp	", addr.bufp\X, "\n");
	print("	defaultfont	", addr.defaultfont\X, "\n");
	print("	defaultsubfont	", addr.defaultsubfont\X, "\n");
	print("	windows	", addr.windows\X, "\n");
};

sizeofImage = 56;
aggr Image
{
	'A' Display 0 display;
	'D' 4 id;
	Rectangle 8 r;
	Rectangle 24 clipr;
	'D' 40 ldepth;
	'D' 44 repl;
	'A' Screen 48 screen;
	'A' Image 52 next;
};

defn
Image(addr) {
	complex Image addr;
	print("	display	", addr.display\X, "\n");
	print("	id	", addr.id, "\n");
	print("Rectangle r {\n");
	Rectangle(addr.r);
	print("}\n");
	print("Rectangle clipr {\n");
	Rectangle(addr.clipr);
	print("}\n");
	print("	ldepth	", addr.ldepth, "\n");
	print("	repl	", addr.repl, "\n");
	print("	screen	", addr.screen\X, "\n");
	print("	next	", addr.next\X, "\n");
};

sizeofRGB = 12;
aggr RGB
{
	'U' 0 red;
	'U' 4 green;
	'U' 8 blue;
};

defn
RGB(addr) {
	complex RGB addr;
	print("	red	", addr.red, "\n");
	print("	green	", addr.green, "\n");
	print("	blue	", addr.blue, "\n");
};

sizeofFontchar = 8;
aggr Fontchar
{
	'D' 0 x;
	'b' 4 top;
	'b' 5 bottom;
	'C' 6 left;
	'b' 7 width;
};

defn
Fontchar(addr) {
	complex Fontchar addr;
	print("	x	", addr.x, "\n");
	print("	top	", addr.top, "\n");
	print("	bottom	", addr.bottom, "\n");
	print("	left	", addr.left, "\n");
	print("	width	", addr.width, "\n");
};

sizeofSubfont = 16;
aggr Subfont
{
	'X' 0 name;
	'd' 4 n;
	'b' 6 height;
	'C' 7 ascent;
	'A' Fontchar 8 info;
	'A' Image 12 bits;
};

defn
Subfont(addr) {
	complex Subfont addr;
	print("	name	", addr.name\X, "\n");
	print("	n	", addr.n, "\n");
	print("	height	", addr.height, "\n");
	print("	ascent	", addr.ascent, "\n");
	print("	info	", addr.info\X, "\n");
	print("	bits	", addr.bits\X, "\n");
};

LOG2NFCACHE = 6;
NFCACHE = 64;
NFLOOK = 5;
NFSUBF = 2;
MAXFCACHE = 1029;
MAXSUBF = 50;
DSUBF = 4;
SUBFAGE = 10000;
CACHEAGE = 10000;
sizeofCachefont = 16;
aggr Cachefont
{
	'u' 0 min;
	'u' 2 max;
	'D' 4 offset;
	'X' 8 name;
	'X' 12 subfontname;
};

defn
Cachefont(addr) {
	complex Cachefont addr;
	print("	min	", addr.min, "\n");
	print("	max	", addr.max, "\n");
	print("	offset	", addr.offset, "\n");
	print("	name	", addr.name\X, "\n");
	print("	subfontname	", addr.subfontname\X, "\n");
};

sizeofCacheinfo = 8;
aggr Cacheinfo
{
	'u' 0 x;
	'b' 2 width;
	'C' 3 left;
	'u' 4 value;
	'u' 6 age;
};

defn
Cacheinfo(addr) {
	complex Cacheinfo addr;
	print("	x	", addr.x, "\n");
	print("	width	", addr.width, "\n");
	print("	left	", addr.left, "\n");
	print("	value	", addr.value, "\n");
	print("	age	", addr.age, "\n");
};

sizeofCachesubf = 12;
aggr Cachesubf
{
	'U' 0 age;
	'A' Cachefont 4 cf;
	'A' Subfont 8 f;
};

defn
Cachesubf(addr) {
	complex Cachesubf addr;
	print("	age	", addr.age, "\n");
	print("	cf	", addr.cf\X, "\n");
	print("	f	", addr.f\X, "\n");
};

sizeofFont = 52;
aggr Font
{
	'X' 0 name;
	'A' Display 4 display;
	'd' 8 height;
	'd' 10 ascent;
	'D' 12 maxldepth;
	'd' 16 width;
	'd' 18 ldepth;
	'd' 20 nsub;
	'U' 24 age;
	'D' 28 ncache;