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

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