net.mograsim.machine/src/net/mograsim/machine/isa/AsmIntegerOperand.java

   1 package net.mograsim.machine.isa;
   2
   3 import java.math.BigInteger;
   4
   5 import net.mograsim.logic.core.types.Bit;
   6 import net.mograsim.logic.core.types.BitVector;
   7 import net.mograsim.logic.core.types.BitVector.BitVectorMutator;
   8 import net.mograsim.machine.isa.types.AsmNumberFormatException;
   9
  10 public class AsmIntegerOperand implements AsmOperand
  11 {
  12         private final int size;
  13
  14         public AsmIntegerOperand(int size)
  15         {
  16                 this.size = size;
  17         }
  18
  19         @Override
  20         public int getSize()
  21         {
  22                 return size;
  23         }
  24
  25         @Override
  26         public BitVector parse(String s) throws AsmNumberFormatException
  27         {
  28                 String cleaned = s.replace("_", "").toLowerCase();
  29                 int len = cleaned.length();
  30                 BigInteger res;
  31                 try
  32                 {
  33                         if (cleaned.startsWith("0x"))
  34                                 res = new BigInteger(cleaned.substring(2), 16);
  35                         else if (cleaned.endsWith("h"))
  36                                 res = new BigInteger(cleaned.substring(0, len - 1), 16);
  37                         else if (cleaned.startsWith("0b"))
  38                                 res = new BigInteger(cleaned.substring(2), 2);
  39                         else if (cleaned.endsWith("b"))
  40                                 res = new BigInteger(cleaned.substring(2), 2);
  41                         else if (cleaned.endsWith("q"))
  42                                 res = new BigInteger(cleaned.substring(0, len - 1), 8);
  43                         else
  44                                 res = new BigInteger(cleaned);
  45                 }
  46                 catch (NumberFormatException e)
  47                 {
  48                         throw new AsmNumberFormatException(e, "Error parsing %s: no valid integer format", s);
  49                 }
  50                 return bigIntToBitVector(res);
  51         }
  52
  53         BitVector bigIntToBitVector(BigInteger bi) throws AsmNumberFormatException
  54         {
  55                 int bitLength = bi.bitLength() - (bi.signum() - 1) / 2;
  56                 if (bitLength > size)
  57                         throw new AsmNumberFormatException("Error parsing %s: bit count %d exceeds size %d", bi, bitLength, size);
  58                 BitVectorMutator bvm = BitVectorMutator.ofLength(size);
  59                 for (int i = 0; i < size; i++)
  60                         bvm.setLSBit(i, Bit.of(bi.testBit(i)));
  61                 return bvm.toBitVector();
  62         }
  63
  64         public static void main(String[] args) throws AsmNumberFormatException
  65         {
  66                 AsmIntegerOperand aio = new AsmIntegerOperand(4);
  67                 System.out.println(aio.parse("0"));
  68                 System.out.println(aio.parse("1"));
  69                 System.out.println(aio.parse("2"));
  70                 System.out.println(aio.parse("3"));
  71                 System.out.println(aio.parse("4"));
  72                 System.out.println(aio.parse("5"));
  73                 System.out.println(aio.parse("6"));
  74                 System.out.println(aio.parse("7"));
  75                 System.out.println(aio.parse("8"));
  76                 System.out.println(aio.parse("9"));
  77                 System.out.println(aio.parse("10"));
  78                 System.out.println(aio.parse("11"));
  79                 System.out.println(aio.parse("12"));
  80                 System.out.println(aio.parse("13"));
  81                 System.out.println(aio.parse("14"));
  82                 System.out.println(aio.parse("15"));
  83 //              System.out.println(aio.parse("16"));
  84                 System.out.println(aio.parse("-0"));
  85                 System.out.println(aio.parse("-1"));
  86                 System.out.println(aio.parse("-2"));
  87                 System.out.println(aio.parse("-3"));
  88                 System.out.println(aio.parse("-4"));
  89                 System.out.println(aio.parse("-5"));
  90                 System.out.println(aio.parse("-6"));
  91                 System.out.println(aio.parse("-7"));
  92                 System.out.println(aio.parse("-8"));
  93 //              System.out.println(aio.parse("-9"));
  94         }
  95 }