src/edu/berkeley/fleet/ies44/InstructionEncoder.java

   1 package edu.berkeley.fleet.ies44;
   2 import edu.berkeley.fleet.api.*;
   3 import edu.berkeley.fleet.*;
   4 import edu.berkeley.fleet.util.*;
   5 import java.io.*;
   6 import static edu.berkeley.fleet.util.BitManipulations.*;
   7 import static edu.berkeley.fleet.api.Instruction.*;
   8 import static edu.berkeley.fleet.api.Instruction.Counter.*;
   9
  10 public abstract class InstructionEncoder {
  11
  12     public static final int WIDTH_WORD             = 37;
  13     public static final int WIDTH_ADDR             = 11;
  14     public static final int WIDTH_CODEBAG_SIZE     = 6;
  15     public static final int WIDTH_COUNTER_LITERAL  = 6;
  16
  17     public static final Mask REPEAT_FROM_DATA    = new Mask("...............000001.........0......");
  18     public static final Mask REPEAT_FROM_LITERAL = new Mask("...............000001.........1vvvvvv");
  19     public static final Mask LOOP_FROM_DATA      = new Mask("...............000010.........0......");
  20     public static final Mask LOOP_FROM_LITERAL   = new Mask("...............000010.........1vvvvvv");
  21     public static final Mask TAKE_LOOP           = new Mask("...............000011................");
  22     public static final Mask KILL                = new Mask("...............000100..........vvvvvv");
  23     public static final Mask MASSACRE            = new Mask("...............000101................");
  24     public static final Mask CLOG                = new Mask("...............000110................");
  25     public static final Mask UNCLOG              = new Mask("...............000111................");
  26
  27     public static final Mask SK                  = new Mask("...........1.........................");
  28     public static final Mask DL                  = new Mask("............1........................");
  29     public static final Mask P                   = new Mask(".............vv......................");
  30     public static final Mask MOVE                = new Mask("...............001...................");
  31     public static final Mask STAND               = new Mask("...................1.................");
  32     public static final Mask TI                  = new Mask("....................1................");
  33     public static final Mask DI                  = new Mask(".....................1...............");
  34     public static final Mask DC                  = new Mask("......................1..............");
  35     public static final Mask DO                  = new Mask(".......................1.............");
  36     public static final Mask TO                  = new Mask("........................1............");
  37     public static final Mask PATH_LITERAL        = new Mask(".........................1vvvvvvvvvvv");
  38     public static final Mask PATH_DATA           = new Mask(".........................01..........");
  39     public static final Mask PATH_NOCHANGE       = new Mask(".........................00..........");
  40
  41     public static final Mask LITERAL_LO          = new Mask("...............010vvvvvvvvvvvvvvvvvvv");
  42     public static final Mask LITERAL_HI          = new Mask("...............011vvvvvvvvvvvvvvvvvvv");
  43     public static final Mask LITERAL             = new Mask("...............1..vvvvvvvvvvvvvvvvvvv");
  44     public static final Mask LITERAL_SEL         = new Mask("................vv...................");
  45     public static final Mask PUMP_NAME           = new Mask("vvvvvvvvvvv..........................");
  46
  47
  48     /** get the bits describing this box's location on the DESTINATION HORN */
  49     protected abstract long getDestAddr(Destination box);
  50
  51     /** get the bits describing this box's location on the INSTRUCTION HORN */
  52     protected abstract long getBoxInstAddr(Pump box);
  53
  54     /** given an INSTRUCTION HORN address, retrieve the corresponding Pump object */
  55     protected abstract Pump getBoxByInstAddr(long dest);
  56
  57     /** given a DESTINATION HORN address, retrieve the corresponding Pump object */
  58     protected abstract Destination getDestByAddr(long dest);
  59
  60     /** read a machine-formatted instruction from a file (into a Java object) */
  61     public Instruction readInstruction(DataInputStream is) throws IOException {
  62         long inst = 0;
  63         try {
  64             inst = (inst << 8) | (is.readByte() & 0xff);
  65             inst = (inst << 8) | (is.readByte() & 0xff);
  66             inst = (inst << 8) | (is.readByte() & 0xff);
  67             inst = (inst << 8) | (is.readByte() & 0xff);
  68             inst = (inst << 8) | (is.readByte() & 0xff);
  69             inst = (inst << 8) | (is.readByte() & 0xff);
  70             return readInstruction(inst);
  71         } catch (EOFException eof) {
  72             return null;
  73         }
  74     }
  75
  76     public Instruction readInstruction(long inst) {
  77         Pump name           = getBoxByInstAddr(PUMP_NAME.getval(inst));
  78
  79         if (LOOP_FROM_LITERAL.get(inst))   return new Counter(name, (int)LOOP_FROM_LITERAL.getval(inst),   LOOP_COUNTER);
  80         if (REPEAT_FROM_LITERAL.get(inst)) return new Counter(name, (int)REPEAT_FROM_LITERAL.getval(inst), REPEAT_COUNTER);
  81         if (LOOP_FROM_DATA.get(inst))      return new Counter(name, DATA_LATCH, LOOP_COUNTER);
  82         if (REPEAT_FROM_DATA.get(inst))    return new Counter(name, DATA_LATCH, REPEAT_COUNTER);
  83         if (TAKE_LOOP.get(inst))           return new Counter(name, LOOP_COUNTER, DATA_LATCH);
  84
  85         if (DL.get(inst))                  return new Instruction.DecrLoop(name);
  86
  87         if (UNCLOG.get(inst))   return new Instruction.UnClog(name);
  88         if (CLOG.get(inst))     return new Instruction.Clog(name);
  89         if (MASSACRE.get(inst)) return new Instruction.Massacre(name);
  90         if (KILL.get(inst))     return new Instruction.Kill(name, (int)(KILL.getval(inst)+1));
  91         if (LITERAL_LO.get(inst))  return new Instruction.HalfLiteral(name, LITERAL_LO.getval(inst), 0, false);
  92         if (LITERAL_HI.get(inst))  return new Instruction.HalfLiteral(name, LITERAL_HI.getval(inst), 0, true);
  93
  94         Destination dest    = getDestByAddr(PATH_LITERAL.getval(inst));
  95         boolean tokenIn     = TI.get(inst);
  96         boolean dataIn      = DI.get(inst);
  97         boolean latch       = DC.get(inst);
  98         boolean dataOut     = DO.get(inst);
  99         boolean tokenOut    = TO.get(inst);
 100         boolean standing    = STAND.get(inst);
 101         boolean dataOutDest = PATH_DATA.get(inst);
 102         return new Instruction.Move(name,
 103                                     dest,
 104                                     standing?0:1,
 105                                     tokenIn,
 106                                     dataIn,
 107                                     latch,
 108                                     dataOutDest,
 109                                     dataOut,
 110                                     tokenOut,
 111                                     false,
 112                                     false);
 113     }
 114
 115     public long writeInstruction(Instruction d) {
 116         long instr = 0;
 117
 118         if (d.pump != null)
 119             instr = PUMP_NAME.setval(instr, getBoxInstAddr(d.pump));
 120
 121         if (d instanceof Instruction.CodeBagDescriptor) {
 122             Instruction.CodeBagDescriptor lc = (Instruction.CodeBagDescriptor)d;
 123             // MAJOR MAJOR FIXME: upper half here...
 124             d = new Instruction.HalfLiteral(lc.pump, ((lc.offset << WIDTH_CODEBAG_SIZE)) | lc.size, 1, false);
 125         }
 126
 127         if (d instanceof Instruction.UnClog) {
 128             instr = UNCLOG.set(instr);
 129
 130         } else if (d instanceof Instruction.Kill) {
 131             Instruction.Kill k = (Instruction.Kill)d;
 132             instr = KILL.set(instr);
 133             instr = KILL.setval(instr, k.count);
 134
 135         } else if (d instanceof Instruction.Clog) {
 136             instr = CLOG.set(instr);
 137
 138         } else if (d instanceof Instruction.Massacre) {
 139             instr = MASSACRE.set(instr);
 140
 141         } else if (d instanceof Instruction.HalfLiteral) {
 142             Instruction.HalfLiteral inst = (Instruction.HalfLiteral)d;
 143             if (inst.pump != null) {
 144                 if (inst.high) {
 145                     instr = LITERAL_HI.set(instr);
 146                     instr = LITERAL_HI.setval(instr, inst.literal);
 147                 } else {
 148                     instr = LITERAL_LO.set(instr);
 149                     instr = LITERAL_LO.setval(instr, inst.literal);
 150                 }
 151             } else {
 152                 instr = inst.literal;
 153             }
 154
 155         } else if (d instanceof Instruction.DecrLoop) {
 156             instr = DL.set(instr);
 157
 158         } else if (d instanceof Instruction.Counter) {
 159             Instruction.Counter ic = (Instruction.Counter)d;
 160             if      (ic.dest == DATA_LATCH && ic.source == LOOP_COUNTER)   instr = TAKE_LOOP.set(instr);
 161             else if (ic.dest == REPEAT_COUNTER && ic.source == DATA_LATCH) instr = REPEAT_FROM_DATA.set(instr);
 162             else if (ic.dest == LOOP_COUNTER && ic.source == DATA_LATCH)   instr = LOOP_FROM_DATA.set(instr);
 163             else if (ic.dest == REPEAT_COUNTER)                            instr = REPEAT_FROM_LITERAL.setval(REPEAT_FROM_LITERAL.set(instr), ic.source);
 164             else if (ic.dest == LOOP_COUNTER)                              instr = LOOP_FROM_LITERAL.setval(LOOP_FROM_LITERAL.set(instr), ic.source);
 165             else throw new RuntimeException();
 166
 167         } else if (d instanceof Instruction.Move) {
 168             Instruction.Move inst = (Instruction.Move)d;
 169             instr  = MOVE.set(instr);
 170             if (inst.tokenIn)                    instr = TI.set(instr);
 171             if (inst.dataIn)                     instr = DI.set(instr);
 172             if (inst.latch)                      instr = DC.set(instr);
 173             if (inst.dataOut)                    instr = DO.set(instr);
 174             if (inst.tokenOut)                   instr = TO.set(instr);
 175             if (inst.dataOutDest)                instr = PATH_DATA.set(instr);
 176             else {
 177                 instr  = PATH_LITERAL.set(instr);
 178                 instr  = PATH_LITERAL.setval(instr, inst.dest==null?0:getDestAddr(inst.dest));
 179             }
 180             if (inst.standing)                   instr = STAND.set(instr);
 181
 182         }
 183         return instr;
 184     }
 185
 186     public void writeInstruction(DataOutputStream os, Instruction d) throws IOException {
 187         long instr = writeInstruction(d);
 188         for(int i=5; i>=0; i--)
 189             os.write(getIntField(i*8+7, i*8, instr));
 190    }
 191
 192 }