src/edu/berkeley/fleet/assembler/Parser.java

   1 package edu.berkeley.fleet.assembler;
   2 import edu.berkeley.fleet.api.*;
   3 import edu.berkeley.sbp.*;
   4 import edu.berkeley.sbp.chr.*;
   5 import edu.berkeley.sbp.misc.*;
   6 import edu.berkeley.sbp.meta.*;
   7 import edu.berkeley.sbp.util.*;
   8 import static edu.berkeley.fleet.util.BitManipulations.*;
   9 import edu.berkeley.fleet.two.*;
  10 import edu.berkeley.fleet.api.Instruction.Set;
  11 import static edu.berkeley.fleet.api.Instruction.*;
  12 import static edu.berkeley.fleet.api.Instruction.Set.*;
  13 import static edu.berkeley.fleet.api.Predicate.*;
  14 import edu.berkeley.fleet.two.*;
  15 import static edu.berkeley.fleet.two.FleetTwoFleet.SHIFT;
  16 import edu.berkeley.fleet.fpga.*;
  17 import edu.berkeley.fleet.interpreter.*;
  18 import java.util.*;
  19 import java.io.*;
  20
  21
  22 /**
  23  *  @author Adam Megacz <megacz@cs.berkeley.edu>
  24  */
  25 public class Parser {
  26
  27     private static final BitVector SIGNAL_ZERO = new BitVector(1);
  28     private static final BitVector SIGNAL_ONE  = new BitVector(1);
  29     static {
  30         SIGNAL_ONE.set(0,true);
  31     }
  32
  33     Parser(Fleet fleet) {
  34         expect = new ArrayList<Long>();
  35         this.fleet = fleet;
  36     }
  37
  38     //////////////////////////////////////////////////////////////////////////////
  39
  40     private Fleet fleet;
  41     private ArrayList<String> imports = new ArrayList<String>();
  42
  43     private HashMap<String,Ship> shipMap = new HashMap<String,Ship>();
  44
  45     // codebags in numerical order
  46     private ArrayList<CodeBag> codeBags = new ArrayList<CodeBag>();
  47     private HashMap<String,CodeBag> codeBagsByName = new HashMap<String,CodeBag>();
  48
  49     private CodeBag getCodeBag(String name) {
  50         CodeBag cb = codeBagsByName.get(name);
  51         if (cb!=null) return cb;
  52         return new CodeBag(name);
  53     }
  54
  55     private static Union grammar;
  56     private static synchronized Union getGrammar() throws Exception {
  57         if (grammar != null) return grammar;
  58         InputStream grammarStream =
  59             Parser.class.getClassLoader().getResourceAsStream("edu/berkeley/fleet/assembler/fleet.g");
  60         CharParser metaGrammarParser   = new CharParser(GrammarAST.getMetaGrammar());
  61         Tree<String> parsedGrammar     = metaGrammarParser.parse(new CharInput(grammarStream)).expand1();
  62         grammar                        = GrammarAST.buildFromAST(parsedGrammar, "s", new GrammarAST.ImportResolver() {
  63                 public InputStream getImportStream(String importname) { return null; }
  64             });
  65         return grammar;
  66     }
  67
  68     // FIXME: this ought to be cached via serialization, I think
  69     private static CharParser cp = null;
  70     Tree<String> parseIt(Reader r) throws Exception {
  71         if (cp==null)
  72             cp = new CharParser(getGrammar());
  73         CharInput ci = new CharInput(r);
  74         Forest f = cp.parse(ci);
  75         return f.expand1();
  76     }
  77
  78     public Instruction[] parse(Reader r) throws Exception {
  79         // this needs to be "code bag zero"
  80         CodeBag baseCodeBag = new CodeBag();
  81         CodeBag rootCodeBag = new CodeBag();
  82         skip = false;
  83         Tree<String> parsed = (Tree<String>)parseIt(r);
  84         walk(parsed, rootCodeBag);
  85
  86         // map from arbitrary identifiers to actual addresses
  87         int[] codeBagMap = new int[codeBags.size()];
  88         int count = 0;
  89         for(int i=0; i<codeBags.size(); i++) {
  90             CodeBag c = codeBags.get(i);
  91             codeBagMap[i] = count;
  92             for(Instruction inst : c) {
  93                 count++;
  94             }
  95         }
  96
  97         // now write for real
  98         count = 0;
  99         ArrayList<Instruction> ret = new ArrayList<Instruction>();
 100         for(int i=0; i<codeBags.size(); i++) {
 101             CodeBag c = codeBags.get(i);
 102             for(int j=0; j<c.size(); j++) {
 103                 Instruction inst = c.get(j);
 104                 if (c.isCBD.contains(j)) {
 105                     Set old = (Set)inst;
 106                     long lit = 0;
 107                     lit = FleetTwoFleet.CBD_SIZE.setval(lit, codeBags.get((int)old.immediate).size());
 108                     lit = FleetTwoFleet.CBD_OFFSET.setval(lit, codeBagMap[(int)old.immediate]);
 109                     inst = new Set(old.dock, false, IgnoreOLC, SetDest.DataLatch, lit);
 110                 }
 111                 ret.add(inst);
 112                 count++;
 113             }
 114         }
 115         long startcbd = 0;
 116         for(int i=0; i<codeBags.size(); i++) {
 117             if (codeBags.get(i)==rootCodeBag) {
 118                 long lit = 0;
 119                 lit = FleetTwoFleet.CBD_SIZE.setval(lit, codeBags.get(i).size());
 120                 lit = FleetTwoFleet.CBD_OFFSET.setval(lit, codeBagMap[i]);
 121                 startcbd = lit;
 122             }
 123         }
 124         if (codeBags.size()<=2)
 125             return (Instruction[])ret.toArray(new Instruction[0]);
 126         return fixup((Instruction[])ret.toArray(new Instruction[0]), startcbd);
 127     }
 128
 129     private Instruction[] fixup(Instruction[] instructions, long startcbd) {
 130         ArrayList<Instruction> ret = new ArrayList<Instruction>();
 131         Fleet fpga = fleet;
 132
 133         Dock inAddrWrite = null;
 134         Dock inDataWrite = null;
 135         Dock inCBD       = null;
 136         Dock out         = null;
 137         Dock debugIn     = null;
 138         Dock ihorn       = null;
 139
 140         for(Ship ship : fpga) {
 141             if ("Memory".equals(ship.getType()) && ship.getOrdinal()==0) {
 142                 inAddrWrite = ship.getDock("inAddrWrite");
 143                 inDataWrite = ship.getDock("inDataWrite");
 144                 inCBD = ship.getDock("inCBD");
 145                 out = ship.getDock("out");
 146                 ihorn = out;
 147                 //ihorn = ship.getDock("outIhorn");
 148             }
 149             if ("Debug".equals(ship.getType()) && ship.getOrdinal()==0) {
 150                 debugIn = ship.getDock("in");
 151             }
 152         }
 153
 154         for(int i=0; i<instructions.length; i++) {
 155             long lit = ((FleetTwoFleet)fpga).writeInstruction(instructions[i], out);
 156             ret.add(discard(out));
 157             ret.add(new Instruction.Shift(inDataWrite, false, IgnoreOLC, new BitVector(fpga.getWordWidth()).set(getField(36, 19, lit))));
 158             ret.add(new Instruction.Shift(inDataWrite, false, IgnoreOLC, new BitVector(fpga.getWordWidth()).set(getField(18,  0, lit))));
 159             ret.add(deliver(inDataWrite));
 160             ret.add(new Instruction.Shift(inAddrWrite, false, IgnoreOLC, new BitVector(fpga.getWordWidth()).set(getField(36, 19, i))));
 161             ret.add(new Instruction.Shift(inAddrWrite, false, IgnoreOLC, new BitVector(fpga.getWordWidth()).set(getField(18,  0, i))));
 162             ret.add(deliver(inAddrWrite));
 163         }
 164         ret.add(new Instruction.Shift(inCBD, false, IgnoreOLC, new BitVector(fpga.getWordWidth()).set(getField(36, 19, startcbd))));
 165         ret.add(new Instruction.Shift(inCBD, false, IgnoreOLC, new BitVector(fpga.getWordWidth()).set(getField(18,  0, startcbd))));
 166         ret.add(wait(inCBD));
 167         ret.add(deliver(inCBD));
 168         ret.add(sendto(out, out.getPath(inCBD.getDataDestination(),null)));
 169
 170         int count = (int)FleetTwoFleet.CBD_SIZE.getval(startcbd);
 171         // FIXME FIXME FIXME!
 172         int MAX_ILC = 31;
 173         int num_instrs = 0;
 174         while(count > 0) {
 175             int num = Math.min(count, MAX_ILC);
 176             num_instrs+=2;
 177             count -= num;
 178             ret.add(new Instruction.Set(ihorn, false, IgnoreOLC, SetDest.InnerLoopCounter, num));
 179             ret.add(new Instruction.Move(ihorn, false, IgnoreOLC, false, null,false,true,true,true,true,false));
 180         }
 181         if (num_instrs > ihorn.getInstructionFifoSize()) throw new RuntimeException();
 182
 183         return (Instruction[])ret.toArray(new Instruction[0]);
 184     }
 185
 186     /** in the first pass, codebags are assigned "addresses" in arbitrary order */
 187     void walk(Tree<String> t, CodeBag cb) {
 188
 189         String head = t.head();
 190         if (head==null) {
 191         } else if (head.equals("Program")) {
 192             for(Tree<String> tc : t.child(0))
 193                 walk(tc, cb);
 194             if (t.size()>1)
 195                 for(Tree<String> statement : t.child(1))
 196                     fillCodeBag(statement, cb);
 197
 198         } else if (head.equals("#ship")) {
 199             String name = name(t.child(0));
 200             String type = string(t.child(1));
 201             Ship ship = null;
 202
 203             if (fleet instanceof FleetWithDynamicShips) {
 204                 FleetWithDynamicShips dyn = ((FleetWithDynamicShips)fleet);
 205                 ship = dyn.createShip(type, name);
 206                 if (ship==null)
 207                     throw new RuntimeException("couldn't find a ship called \""+type+"\"");
 208             } else {
 209                 ship = allocateShip(type);
 210             }
 211             shipMap.put(name, ship);
 212
 213         } else if (head.equals("#expect")) {
 214             expect.add(number(t.child(0)));
 215         } else if (head.equals("#skip")) {
 216             skip = true;
 217
 218         }
 219     }
 220
 221     String string(Tree<String> t) {
 222         String ret = "";
 223         if (t.head() != null) ret += t.head();
 224         for(Tree<String> c : t)
 225             ret += string(c);
 226         return ret;
 227     }
 228
 229     String stringBody(Tree<String> t) {
 230         String ret = "";
 231         for(Tree<String> c : t)
 232             ret += string(c);
 233         return ret;
 234     }
 235
 236     String name(Tree<String> t) {
 237         return string(t.child(0))+string(t.child(1));
 238     }
 239
 240     Path path(Dock dock, Tree<String> t) {
 241         if (!"Dock".equals(t.head()) && !"Destination".equals(t.head()) && !"ShipSpecificLiteral".equals(t.head())) return null;
 242         String shipName = name(t.child(0));
 243         String portName = name(t.child(1));
 244         Ship ship = shipMap.get(shipName);
 245         if (ship==null) throw new RuntimeException("no such ship \""+shipName+"\"");
 246         Destination ret = null;
 247         Dock bb = null;
 248         for(Dock b : ship)
 249             if (b.getName().equals(portName)) {
 250                 bb = b;
 251             }
 252         if (bb==null)
 253             throw new RuntimeException("no such pump \""+portName+"\"");
 254         if (t.size() >= 3) {
 255             if (":i".equals(t.child(2).head())) return dock.getPath(bb.getInstructionDestination(),SIGNAL_ZERO);
 256             if (":1".equals(t.child(2).head())) return dock.getPath(bb.getDataDestination(),SIGNAL_ONE);
 257             if (":0".equals(t.child(2).head())) return dock.getPath(bb.getDataDestination(),SIGNAL_ZERO);
 258         }
 259         return dock.getPath(bb.getDataDestination(),SIGNAL_ZERO);
 260     }
 261
 262     Dock dock(Tree<String> t) {
 263         if (!"Dock".equals(t.head()) && !"Destination".equals(t.head()) && !"ShipSpecificLiteral".equals(t.head()))
 264             throw new RuntimeException(t+"");
 265         String shipName = name(t.child(0));
 266         String portName = name(t.child(1));
 267         Ship ship = shipMap.get(shipName);
 268         if (ship==null) throw new RuntimeException("no such ship \""+shipName+"\"");
 269         Dock bb = null;
 270         for(Dock b : ship)
 271             if (b.getName().equals(portName))
 272                 return b;
 273         throw new RuntimeException("no such pump \""+portName+"\"");
 274     }
 275
 276     private HashMap<String,Integer> numAllocated = new HashMap<String,Integer>();
 277
 278     Ship allocateShip(String shipType) {
 279         int allocated = 0;
 280         if (numAllocated.get(shipType) != null)
 281             allocated = numAllocated.get(shipType);
 282         numAllocated.put(shipType, allocated+1);
 283         for(Iterator<Ship> it = fleet.iterator();
 284             it.hasNext();
 285             ) {
 286             Ship s = it.next();
 287             if (s.getType().equals(shipType)) {
 288                 if (allocated == 0) return s;
 289                 allocated--;
 290             }
 291         }
 292         throw new RuntimeException("no more ships of type \""+shipType+"\"");
 293     }
 294
 295     private long parseSSL(Tree t) {
 296         String shipType = name(t.child(0));
 297         String portName = name(t.child(1));
 298         Ship chosenship = null;
 299         for(Ship ship : fleet) {
 300             if (ship.getType().equals(shipType)) {
 301                 chosenship = ship;
 302                 break;
 303             }
 304         }
 305         if (chosenship==null) throw new RuntimeException("no ships of type " + shipType);
 306         Dock chosenport = chosenship.getDock(portName);
 307         Tree specs = t.child(2);
 308         long literal = 0;
 309         for(int i=0; i<specs.size(); i++) {
 310             Tree tt = specs.child(i);
 311             literal |= resolveLiteral(chosenport, stringBody(tt));
 312         }
 313         return literal;
 314     }
 315
 316     private static long resolveLiteral(Dock dd, String s) {
 317         long val = 0;
 318         long ret = 0;
 319         boolean hasval = false;
 320         if (s.indexOf('=') != -1) {
 321             val = Long.parseLong(s.substring(s.indexOf('=')+1));
 322             s = s.substring(0, s.indexOf('='));
 323             hasval = true;
 324         }
 325         ShipDescription.Constant c = ((FleetTwoDock)dd).getConstant(s);
 326         if (c==null) throw new RuntimeException("no constant " + s + " on dock " + dd);
 327         ret |= c.setbits;
 328         ret &= ~c.clearbits;
 329         if (hasval)
 330             ret |= ((~(0xffffffffffffffffL << c.numberWidth)) & val) << c.numberOffset;
 331         return ret;
 332     }
 333
 334     private static FlagFunction parseFlags(Tree<String> t) {
 335         FlagFunction ret = FlagFunction.ZERO;
 336         for(int i=0; i<t.size(); i++) {
 337             String s = t.child(i).head();
 338             if (s.equals("0"))  ret = ret.add(FlagFunction.ZERO);
 339             if (s.equals("1"))  ret = ret.add(FlagFunction.ONE);
 340             if (s.equals("a"))  ret = ret.add(FlagA);
 341             if (s.equals("!a")) ret = ret.add(NotFlagA);
 342             if (s.equals("b"))  ret = ret.add(FlagB);
 343             if (s.equals("!b")) ret = ret.add(NotFlagB);
 344             if (s.equals("c"))  ret = ret.add(FlagC);
 345             if (s.equals("!c")) ret = ret.add(NotFlagC);
 346         }
 347         return ret;
 348     }
 349
 350     private int anoncount = 1;
 351     void fillCodeBag(Tree<String> t, CodeBag cb) {
 352         if (t.head()==null) return;
 353         else if (t.head().equals("CodeBagDef")) {
 354             CodeBag cb2 = getCodeBag(name(t.child(0)));
 355             for(Tree<String> statement : t.child(1))
 356                 fillCodeBag(statement, cb2);
 357
 358         } else if (t.head().equals("Fiber")) {
 359             Dock dock = (Dock)dock(t.child(0));
 360
 361             OUTER: for(Tree tt : t.child(1)) {
 362
 363                 if ("tail".equals(tt.head()))    {
 364                     cb.add(new Tail(dock));
 365                     continue;
 366                 }
 367
 368                 int count = 1;
 369                 Predicate predicate = Default;
 370                 boolean looping = false;
 371                 boolean interruptible = false;
 372                 for(int i=0; i<tt.child(0).size(); i++) {
 373                     Tree ttt = tt.child(0).child(i);
 374                     if ("[a]".equals(ttt.head()))  predicate = FlagA;
 375                     if ("[b]".equals(ttt.head()))  predicate = FlagB;
 376                     if ("[c]".equals(ttt.head()))  predicate = FlagC;
 377                     if ("[!a]".equals(ttt.head())) predicate = NotFlagA;
 378                     if ("[!b]".equals(ttt.head())) predicate = NotFlagB;
 379                     if ("[!c]".equals(ttt.head())) predicate = NotFlagC;
 380                     // FIXME: test case for this
 381                     if ("[*]".equals(ttt.head()))  predicate = IgnoreOLC;
 382                     // FIXME: test case for this
 383                     if ("[olc=0]".equals(ttt.head()))  predicate = OLCZero;
 384                     if ("[Rq]".equals(ttt.head()))  looping = true;
 385                 }
 386                 tt = tt.child(1);
 387                 if ("tail".equals(tt.head()))    {
 388                     cb.add(new Tail(dock));
 389                     continue;
 390                 } else if ("flags".equals(tt.head()))    {
 391                     cb.add(new Set(dock, looping, predicate, parseFlags(tt.child(0)), parseFlags(tt.child(1))));
 392                     continue;
 393                 } else if ("olc=word".equals(tt.head()))    {
 394                     cb.add(new Set(dock, looping, predicate, SetDest.OuterLoopCounter, SetSource.DataLatch));
 395                     continue;
 396                 } else if ("ilc=word".equals(tt.head()))    {
 397                     cb.add(new Set(dock, looping, predicate, SetDest.InnerLoopCounter, SetSource.DataLatch));
 398                     continue;
 399                 } else if ("*".equals(tt.head()))    {
 400                     cb.add(new Set(dock, looping, predicate, SetDest.InnerLoopCounter, SetSource.Infinity));
 401                     continue;
 402                 } else if ("olc=int".equals(tt.head()))    {
 403                     cb.add(new Set(dock, looping, predicate, SetDest.OuterLoopCounter, (number(tt.child(0)))));
 404                     continue;
 405                 } else if ("ilc=int".equals(tt.head()))    {
 406                     cb.add(new Set(dock, looping, predicate, SetDest.InnerLoopCounter, (number(tt.child(0)))));
 407                     continue;
 408                 } else if ("--".equals(tt.head())) {
 409                     cb.add(new Set(dock, looping, predicate, SetDest.OuterLoopCounter, SetSource.Decrement));
 410                     continue;
 411                 } else if ("nop".equals(tt.head())) {
 412                     // FIXME: test case for "torpedoable nop"
 413                     if (tt.child(0).size() > 0 && "[T]".equals(tt.child(0).head()))  interruptible = true;
 414                     cb.add(new Move(dock, looping, predicate, interruptible, null, false, false, false, false, false, false));
 415                 } else if ("shift".equals(tt.head())) {
 416                     cb.add(new Shift(dock, looping, predicate,
 417                                      new BitVector(dock.getShip().getFleet().getWordWidth()).set(number(tt.child(0)))));
 418                 } else if ("word".equals(tt.head())) {
 419                     long literal = 0;
 420                     if (tt.child(0).head().equals("CodeBagBody")) {
 421                         Tree<String> tq = tt;
 422                         CodeBag cb2 = getCodeBag("anon"+(anoncount++));
 423                         for(Tree<String> statement : tq.child(0))
 424                             fillCodeBag(statement, cb2);
 425                         cb.add(new Set(dock, looping, predicate, SetDest.DataLatch, (cb2.getFakeAddress())), true);
 426                         continue OUTER;
 427                     } else if (tt.child(0).head().equals("Name")) {
 428                         String refname = name(tt.child(0));
 429                         CodeBag cb2 = getCodeBag(refname);
 430                         cb.add(new Set(dock, looping, predicate, SetDest.DataLatch, (cb2.getFakeAddress())), true);
 431                         continue OUTER;
 432                     } else if (tt.child(0).head().equals("[")) {
 433                         literal = parseSSL(tt.child(0));
 434                     } else {
 435                         literal = number(tt.child(0));
 436                     }
 437                     count = 1;
 438                     /*
 439                     if ("int".equals(tt.child(1).head())) {
 440                         count = (int)number(tt.child(1));
 441                     } else if ("forever".equals(tt.child(1).head())) {
 442                         count = 0;
 443                     }
 444                     */
 445
 446
 447                     if (FleetTwoFleet.isSmallEnoughToFit(literal)) {
 448                         cb.add(new Set(dock, looping, predicate, SetDest.DataLatch, (literal)));
 449                     } else {
 450                         int counter = 0;
 451                         while(counter < dock.getShip().getFleet().getWordWidth()) counter += SHIFT.valmaskwidth;
 452                         while(counter > 0) {
 453                             cb.add(new Shift(dock, looping, predicate,
 454                                              new BitVector(dock.getShip().getFleet().getWordWidth())
 455                                              .set(getField(counter-1, counter-SHIFT.valmaskwidth, literal))));
 456                             counter -= SHIFT.valmaskwidth;
 457                         }
 458                     }
 459
 460                     continue;
 461                 }
 462                 Tree ttx = null;
 463                 boolean requeue = false;
 464                 if ("[T]".equals(tt.child(0).head()))  interruptible = true;
 465                 ttx = tt.child(tt.size()-1);
 466                 boolean tokenIn = false;
 467                 boolean dataIn = false;
 468                 boolean latch = false;
 469                 boolean dataOut = false;
 470                 boolean tokenOut = false;
 471                 boolean dispatch = false;
 472                 boolean localLiteral = false;
 473                 boolean ignoreUntilLast = false;
 474                 long literal = 0;
 475                 Path path = null;
 476                 for(int i=0; i<ttx.size(); i++) {
 477                     Tree ttt = ttx.child(i);
 478                     if      ("recv token".equals(ttt.head()))    { tokenIn = true; }
 479                     else if ("discard".equals(ttt.head())) { dataIn = true; latch = false; }
 480                     else if ("take".equals(ttt.head()))    { dataIn = true; latch = true; }
 481                     else if ("collect".equals(ttt.head()))    {
 482                         if (dock.isInputDock())
 483                             throw new RuntimeException("you can't use \"collect\" at input docks; try \"recv\" instead");
 484                         dataIn = true;
 485                         latch = true;
 486                     }
 487                     else if ("collect path".equals(ttt.head()))    {
 488                         if (dock.isInputDock())
 489                             throw new RuntimeException("you can't use \"collect\" at input docks; try \"recv\" instead");
 490                         dataIn = true;
 491                         latch = false;
 492                         dispatch = true;
 493                     }
 494                     else if ("collect packet".equals(ttt.head()))    {
 495                         if (dock.isInputDock())
 496                             throw new RuntimeException("you can't use \"collect\" at input docks; try \"recv\" instead");
 497                         dataIn = true;
 498                         latch = true;
 499                         dispatch = true;
 500                     }
 501                     else if ("collect nothing".equals(ttt.head()))    {
 502                         if (dock.isInputDock())
 503                             throw new RuntimeException("you can't use \"collect\" at input docks; try \"recv\" instead");
 504                         dataIn = true;
 505                     }
 506                     else if ("recv".equals(ttt.head()))    {
 507                         if (dock.isOutputDock())
 508                             throw new RuntimeException("you can't use \"recv\" at input docks; try \"collect\" instead");
 509                         dataIn = true;
 510                         latch = true;
 511                     }
 512                     else if ("recv path".equals(ttt.head()))    {
 513                         if (dock.isOutputDock())
 514                             throw new RuntimeException("you can't use \"recv\" at input docks; try \"collect\" instead");
 515                         dataIn = true;
 516                         latch = false;
 517                         dispatch = true;
 518                     }
 519                     else if ("recv packet".equals(ttt.head()))    {
 520                         if (dock.isOutputDock())
 521                             throw new RuntimeException("you can't use \"recv\" at input docks; try \"collect\" instead");
 522                         dataIn = true;
 523                         latch = true;
 524                         dispatch = true;
 525                     }
 526                     else if ("recv nothing".equals(ttt.head()))    {
 527                         if (dock.isOutputDock())
 528                             throw new RuntimeException("you can't use \"recv\" at input docks; try \"collect\" instead");
 529                         dataIn = true;
 530                     }
 531                     else if ("send".equals(ttt.head()))  {
 532                         dataOut = true;
 533                     }
 534                     else if ("send to".equals(ttt.head()))  { dataOut = true; path = path(dock, ttt.child(0)); }
 535                     else if ("deliver".equals(ttt.head())) { dataOut = true;  }
 536                     else if ("send token".equals(ttt.head()))     { tokenOut = true; }
 537                     else if ("send token to".equals(ttt.head()))     { tokenOut = true; path = path(dock, ttt.child(0)); }
 538                 }
 539                 cb.add(new Move(dock, looping, predicate,
 540                                             interruptible, path, tokenIn, dataIn,
 541                                             latch, dispatch, dataOut, tokenOut));
 542             }
 543         }
 544     }
 545
 546     private class CodeBag extends ArrayList<Instruction> {
 547         public long address = -1;
 548         public final String name;
 549         private HashSet<Integer> isCBD = new HashSet<Integer>();
 550         public CodeBag() { codeBags.add(this); this.name = "root"; }
 551         public CodeBag(String name) { codeBags.add(this); codeBagsByName.put(name, this); this.name = name; }
 552         public long getFakeAddress() { return codeBags.indexOf(this); }
 553         public boolean equals(Object o) { return this==o; }
 554         public void add(Instruction i, boolean isCBD) {
 555             if (isCBD) this.isCBD.add(size());
 556             add(i);
 557         }
 558     }
 559
 560     // hideous hack
 561     public static ArrayList<Long> expect;
 562     public static boolean         skip;
 563
 564     private static long number(Tree t) {
 565         String ret = "";
 566         for(Object c : t.child(2)) ret += ((Tree)c).head();
 567         boolean negative = "-".equals(t.child(0).head());
 568         ret = ret.trim();
 569         long val = 0;
 570         if      ("0x".equals(t.child(1).head())) val = Long.parseLong(ret, 16);
 571         else if ("0b".equals(t.child(1).head())) val = Long.parseLong(ret, 2);
 572         else                                     val = Long.parseLong(ret);
 573         if (negative) val = -1L * val;
 574         return val;
 575     }
 576     /**
 577      *  This interface marks Fleets which can create ships on the fly, like the fleeterpreter;
 578      *  if available, the parser will use this interface to create ships out of #ship definitions.
 579      */
 580     public static interface FleetWithDynamicShips {
 581         public Ship createShip(String shiptype, String shipname);
 582     }
 583
 584     private static Move discard(Dock dock)           { return new Move(dock, false, IgnoreOLC, false, null, false, true,  false, false, false, false); }
 585     private static Move deliver(Dock dock)           { return new Move(dock, false, IgnoreOLC, false, null, false, false, false, false, true,  false); }
 586     private static Move wait(Dock dock)              { return new Move(dock, false, IgnoreOLC, false, null, true,  false, false, false, false, false); }
 587     private static Move sendto(Dock dock, Path path) { return new Move(dock, false, IgnoreOLC, false, path, false, false, false, false, true,  false); }
 588 }