src/edu/berkeley/fleet/interpreter/InterpreterDock.java

   1 package edu.berkeley.fleet.interpreter;
   2 import java.util.*;
   3 import edu.berkeley.sbp.util.ANSI;
   4 import edu.berkeley.fleet.two.*;
   5 import edu.berkeley.fleet.api.*;
   6 import edu.berkeley.fleet.api.Instruction;
   7 import static edu.berkeley.fleet.api.Predicate.*;
   8
   9 /** anything that has a source (instruction horn) address on the switch fabric */
  10 class InterpreterDock extends FleetTwoDock {
  11
  12     // Dock State //////////////////////////////////////////////////////////////////////////////
  13
  14     public boolean flag_a = false;
  15     public boolean flag_b = false;
  16     public boolean flag_c = false;
  17     public int ilc = 1;
  18     public int olc = 1;
  19     public BitVector dataLatch = new BitVector(getShip().getFleet().getWordWidth());
  20     public InterpreterPath pathLatch = null;
  21     public InterpreterPath tapl = null;
  22     public boolean hatchIsOpen = true;
  23
  24     Instruction executing = null;
  25     Queue<Instruction> instructions = new LinkedList<Instruction>();
  26     Queue<Instruction> epilogue = new LinkedList<Instruction>();
  27     boolean dataReadyForShip = false;
  28     boolean readyForDataFromShip = true;
  29     long dataFromShip;
  30     boolean torpedoWaiting = false;
  31
  32     protected void reset() {
  33         ilc = 1;
  34         olc = 1;
  35         flag_a = false;
  36         flag_b = false;
  37         flag_c = false;
  38         dataLatch = new BitVector(getShip().getFleet().getWordWidth());
  39         pathLatch = null;
  40         hatchIsOpen = true;
  41         executing = null;
  42         instructions.clear();
  43         epilogue.clear();
  44         dataReadyForShip = false;
  45         readyForDataFromShip = true;
  46         tapl = null;
  47         torpedoWaiting = false;
  48     }
  49
  50     // Destinations //////////////////////////////////////////////////////////////////////////////
  51
  52     /** includes the epilogue fifo */
  53     public InterpreterDestination instructionDestination = new InterpreterDestination(this, true);
  54     public InterpreterDestination dataDestination = new InterpreterDestination(this, false);
  55
  56     InterpreterDock(InterpreterShip ship, DockDescription bbd) {
  57         super(ship, bbd);
  58     }
  59
  60     public Path getPath(Destination d, BitVector signal) { return new InterpreterPath(this, (InterpreterDestination)d, signal); }
  61     public Destination getInstructionDestination() { return instructionDestination; }
  62     public Destination getDataDestination() { return dataDestination; }
  63     public int getInstructionFifoSize() { return Integer.MAX_VALUE; }
  64     public Interpreter getInterpreter() { return ((InterpreterShip)getShip()).getInterpreter(); }
  65
  66     // interface to subclass ///////////////////////////////////////////////////////////////////////
  67
  68     /** this will be invoked periodically; should return true to "consume" an instruction, false to leave it executing */
  69
  70     public boolean dataReadyForShip() { return dataReadyForShip; }
  71     public final boolean readyForDataFromShip() { return readyForDataFromShip; }
  72
  73     public long removeDataForShip() {
  74         long val = peekDataForShip();
  75         dataReadyForShip = false;
  76         return val;
  77     }
  78     public long peekDataForShip() {
  79         if (!dataReadyForShip) throw new RuntimeException();
  80         BitVector bv = dataLatch;
  81         long val = 0;
  82         for(int i=0; i<bv.length(); i++)
  83             if (bv.get(i))
  84                 val |= (1L << i);
  85         return val;
  86     }
  87     public void addDataFromShip(long data) {
  88         if (!readyForDataFromShip()) throw new RuntimeException();
  89         readyForDataFromShip = false;
  90         dataFromShip = data;
  91     }
  92
  93     protected final void service() {
  94
  95         if (instructionDestination.packets.size() > 0) {
  96             Packet p = instructionDestination.packets.remove();
  97             if (p.isToken) {
  98                 if (torpedoWaiting) throw new RuntimeException("two torpedoes collided!");
  99                 torpedoWaiting = true;
 100             } else {
 101                 BitVector bv = p.value;
 102                 long val = 0;
 103                 for(int i=0; i<bv.length(); i++)
 104                     if (bv.get(i))
 105                         val |= (1L << i);
 106                 epilogue.add(getInterpreter().readInstruction(val, this));
 107             }
 108         }
 109
 110         if (hatchIsOpen && epilogue.size() > 0) {
 111             Instruction inst = epilogue.remove();
 112             if (inst instanceof Instruction.Tail)
 113                 hatchIsOpen = false;
 114             else
 115                 instructions.add(inst);
 116         }
 117
 118         if (dataReadyForShip) return;
 119
 120         if (executing==null && instructions.size() > 0) {
 121             executing = instructions.remove();
 122             return;
 123         }
 124
 125         if (executing==null) return;
 126
 127         if (executing.looping && hatchIsOpen && olc>0) return;
 128
 129         boolean enabled = true;
 130         switch(executing.predicate) {
 131             case IgnoreOLC:  enabled =  true;   break;
 132             case Default:    enabled =  olc>0;  break;
 133             case FlagA:      enabled =  flag_a; break;
 134             case FlagB:      enabled =  flag_b; break;
 135             case FlagC:      enabled =  flag_c; break;
 136             case NotFlagA:   enabled = !flag_a; break;
 137             case NotFlagB:   enabled = !flag_b; break;
 138             case NotFlagC:   enabled = !flag_c; break;
 139             default: throw new RuntimeException();
 140         }
 141         if (!enabled) {
 142             if (executing.looping && olc>0)
 143                 instructions.add(executing);
 144             executing = null;
 145             return;
 146         }
 147
 148         if (executing instanceof Instruction.Move) {
 149             Instruction.Move move = (Instruction.Move)executing;
 150
 151             if (move.interruptible && torpedoWaiting) {
 152                 torpedoWaiting = false;
 153                 executing = null;
 154                 ilc = 1;
 155                 olc = 0;
 156                 if (tapl != null)
 157                     new Packet(tapl, new BitVector(getInterpreter().getWordWidth()), true).send();
 158                 hatchIsOpen = true;
 159                 return;
 160             }
 161
 162             if (move.dataIn  && !isInputDock() && readyForDataFromShip) return;
 163             if (move.dataIn  &&  isInputDock() && dataDestination.packets.size()==0) return;
 164             if (move.tokenIn &&                   dataDestination.packets.size()==0) return;
 165         }
 166
 167         if (executing.looping && olc>0)
 168             instructions.add(executing);
 169
 170         if (executing instanceof Instruction.Shift) {
 171             /*
 172             Instruction.Shift shift = (Instruction.Shift)executing;
 173             for(int i=dataLatch.length()-1; i>=getShip().getFleet().getShiftWidth(); i--)
 174                 dataLatch.set(i, dataLatch.get(i-getShip().getFleet().getShiftWidth()));
 175             for(int i=getShip().getFleet().getShiftWidth()-1; i>=0; i--)
 176                 dataLatch.set(i, shift.immediate.get(i));
 177             executing = null;
 178             return;
 179             */
 180             throw new RuntimeException("FIXME");
 181         }
 182
 183         if (executing instanceof Instruction.Set) {
 184             Instruction.Set set = (Instruction.Set)executing;
 185             switch(set.dest) {
 186                 case DataLatch:
 187                     dataLatch = new BitVector(getInterpreter().getWordWidth()).setAndSignExtend(set.immediate);
 188                     break;
 189                 case InnerLoopCounter:
 190                     switch(set.source) {
 191                         case Infinity:
 192                             ilc = -1;
 193                             break;
 194                         case DataLatch:
 195                             ilc = 0;
 196                             for(int i=0; i<((FleetTwoFleet)getShip().getFleet()).SET_ILC_FROM_IMMEDIATE.valmaskwidth-1; i++)
 197                                 if (dataLatch.get(i))
 198                                     ilc |= (1 << i);
 199                             break;
 200                         case Immediate:
 201                             ilc = (int)set.immediate;
 202                             break;
 203                         default:
 204                             throw new RuntimeException("FIXME!");
 205                     }
 206                     break;
 207                 case OuterLoopCounter:
 208                     switch(set.source) {
 209                         case Decrement:
 210                             olc = Math.max(0,olc-1);
 211                             if (olc==0) hatchIsOpen = true;
 212                             break;
 213                         case DataLatch:
 214                             olc = 0;
 215                             for(int i=0; i<((FleetTwoFleet)getShip().getFleet()).SET_OLC_FROM_IMMEDIATE.valmaskwidth-1; i++)
 216                                 if (dataLatch.get(i))
 217                                     olc |= (1 << i);
 218                             if (olc==0) hatchIsOpen = true;
 219                             break;
 220                         case Immediate:
 221                             olc = (int)set.immediate;
 222                             if (olc==0) hatchIsOpen = true;
 223                             break;
 224                         default:
 225                             throw new RuntimeException("FIXME!");
 226                     }
 227                     break;
 228
 229                 case Flags: {
 230                     boolean new_flag_a = false;
 231                     boolean new_flag_b = false;
 232                     for(Predicate p : set.newFlagA)
 233                         switch(p) {
 234                             case FlagA: new_flag_a |= flag_a; break;
 235                             case FlagB: new_flag_a |= flag_b; break;
 236                             case FlagC: new_flag_a |= flag_c; break;
 237                             case NotFlagA: new_flag_a |= !flag_a; break;
 238                             case NotFlagB: new_flag_a |= !flag_b; break;
 239                             case NotFlagC: new_flag_a |= !flag_c; break;
 240                         }
 241                     for(Predicate p : set.newFlagB)
 242                         switch(p) {
 243                             case FlagA: new_flag_b |= flag_a; break;
 244                             case FlagB: new_flag_b |= flag_b; break;
 245                             case FlagC: new_flag_b |= flag_c; break;
 246                             case NotFlagA: new_flag_b |= !flag_a; break;
 247                             case NotFlagB: new_flag_b |= !flag_b; break;
 248                             case NotFlagC: new_flag_b |= !flag_c; break;
 249                         }
 250                     flag_a = new_flag_a;
 251                     flag_b = new_flag_b;
 252                     break;
 253                 }
 254                 default:
 255                     throw new RuntimeException("FIXME!");
 256             }
 257             executing = null;
 258             return;
 259         }
 260
 261         Instruction.Move move = (Instruction.Move)executing;
 262
 263         // if ILC==0, don't even bother
 264         if (ilc==0) { ilc = 1; executing = null; return; }
 265
 266         if (ilc==-1)     { }
 267         else if (ilc==1) executing = null;
 268         else             ilc--;
 269
 270         Packet p = null;
 271         if (move.tokenIn) {
 272             p = dataDestination.packets.remove();
 273             if (p.path.signal != null) flag_c = p.path.signal.get(0);
 274         }
 275         if (move.dataIn) {
 276             BitVector bv = null;
 277             if (isInputDock()) {
 278                 p = dataDestination.packets.remove();
 279                 bv = new BitVector(p.value);
 280                 if (p.path.signal != null) flag_c = p.path.signal.get(0);
 281             } else {
 282                 bv = new BitVector(getInterpreter().getWordWidth()).set(dataFromShip);
 283                 readyForDataFromShip = true;
 284             }
 285             if (move.latchData) dataLatch = bv;
 286             if (move.latchPath)
 287                 pathLatch = (InterpreterPath)getInterpreter().getPathByAddr(this, ((FleetTwoFleet)getShip().getFleet()).DISPATCH_PATH.getvalAsBitVector(bv.toLong()));
 288             // FIXME: c-flag at output docks
 289         }
 290
 291         if (move.path != null) pathLatch = (InterpreterPath)move.path;
 292
 293         if (move.dataOut && isInputDock()) dataReadyForShip = true;
 294         if (move.dataOut && !isInputDock())
 295             new Packet(pathLatch, new BitVector(dataLatch), true).send();
 296         if (move.tokenOut)
 297             new Packet(pathLatch, new BitVector(getInterpreter().getWordWidth()), true).send();
 298
 299         return;
 300     }
 301 }