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Assembler.java
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Assembler.java
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public class Assembler
{
public static String[] assemble(String[] inputs) throws Exception
{
String[] outputs = new String[inputs.length];
String splitStrings[];
String op1;
String op2;
String destination;
for(int i = 0; i < inputs.length; i++)
{
splitStrings = inputs[i].split(" ");
switch(splitStrings[0])
{
case "move":
String movOP = "0001";
//Gets register to set to
String registerBin = getRegister(splitStrings[1]);
//turns value into an integer
int value = Integer.parseInt(splitStrings[2]);
//the value we need in binary
longword valueLW = new longword();
valueLW.set(value);
//Turns from T,F to 1's and 0's for substringing. Then getting the 8 bits we need for the value
String valBin = valueLW.zeroOnes().substring(24);
//Concatenate all the parts together for the final instruction
outputs[i] = movOP + registerBin + valBin;
break;
case "interrupt":
//If instruction is an interrupt
String interrupt0OP = "0010";
String rest = "000000000000";
String interrupt1OP = "0010";
String rest1 = "000000000001";
//Have strings for both, then distinguish which output to do
if(splitStrings[1].equals("1"))
{
//For interrupt 1
outputs[i] = interrupt1OP + rest1;
}
else
{
//For interrupt 0
outputs[i] = interrupt0OP + rest;
}
break;
case "halt":
//if its a halt, return all 0's 16 bits
outputs[i] = "0000000000000000";
break;
case "add":
//Adding operatioon
String addOp = "1110";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = addOp + op1 + op2 + destination;
break;
case "sub":
//Subtracting operation
String subOp = "1111";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = subOp + op1 + op2 + destination;
break;
case "multiply":
//Multiplying operation
String multOp = "0111";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = multOp + op1 + op2 + destination;
break;
case "and":
//anding operation
String andOp = "1000";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = andOp + op1 + op2 + destination;
break;
case "or":
String orOp = "1001";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = orOp + op1 + op2 + destination;
break;
case "xor":
String xorOp = "1010";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = xorOp + op1 + op2 + destination;
break;
case "not":
String notOp = "1011";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//Concatenate all the parts together for the final instruction
outputs[i] = notOp + op1 + "0000" + op2;
break;
case "leftshift":
String leftShiftOp = "1100";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = leftShiftOp + op1 + op2 + destination;
break;
case "rightshift":
String rightShiftOp = "1101";
//get the two operands from string.split()
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
//get the destination from string.split()
destination = getRegister(splitStrings[3]);
//Concatenate all the parts together for the final instruction
outputs[i] = rightShiftOp + op1 + op2 + destination;
break;
case "jump":
String jumpOp = "0011";
//turns value into an integer
int jumpVal = Integer.parseInt(splitStrings[1]);
//the value we need in binary
longword jumpValLW = new longword();
jumpValLW.set(jumpVal);
String jumpValueBinary = jumpValLW.zeroOnes().substring(20);
outputs[i] = jumpOp + jumpValueBinary;
break;
case "compare":
String compareOP = "0100";
String zeroes = "0000";
op1 = getRegister(splitStrings[1]);
op2 = getRegister(splitStrings[2]);
outputs[i] = compareOP + zeroes + op1 + op2;
break;
case "branchIfEqual":
String branchIfEqualJumpOp = "0101";
String ccEqual = "10";
String sign = "0";
int addressNum = Integer.parseInt(splitStrings[1]);
if(addressNum < 0)
{
sign = "1";
}
longword address = new longword();
address.set(Integer.parseInt(splitStrings[1]));
String addressStr = address.zeroOnes();
String addressBin = addressStr.substring(23);
outputs[i] = branchIfEqualJumpOp + ccEqual + sign + addressBin;
break;
case "branchIfNotEqual":
String branchIfNotEqualOp = "0101";
String ccNotEqual = "00";
String signNotEqual = "0";
if(Integer.parseInt(splitStrings[1]) < 0)
{
signNotEqual = "1";
}
longword addressNotEqual = new longword();
addressNotEqual.set(Integer.parseInt(splitStrings[1]));
String addressStrNotEqual = addressNotEqual.zeroOnes();
String addressBinNotEqual = addressStrNotEqual.substring(23);
outputs[i] = branchIfNotEqualOp + ccNotEqual + signNotEqual + addressBinNotEqual;
break;
case "branchIfLessThan":
String branchIfLessThanOp = "0101";
String ccLessThan = "00";
String signLessThan = "0";
if(Integer.parseInt(splitStrings[1]) < 0)
{
signLessThan = "1";
}
longword addressLessThan = new longword();
addressLessThan.set(Integer.parseInt(splitStrings[1]));
String addressStrLessThan = addressLessThan.zeroOnes();
String addressBinLessThan = addressStrLessThan.substring(23);
outputs[i] = branchIfLessThanOp + ccLessThan + signLessThan + addressBinLessThan;
break;
case "branchIfGreaterThan":
String branchIfGreaterThanOp = "0101";
String ccGreaterThan = "01";
String signGreaterThan = "0";
if(Integer.parseInt(splitStrings[1]) < 0)
{
signGreaterThan = "1";
}
longword addressGreaterThan = new longword();
addressGreaterThan.set(Integer.parseInt(splitStrings[1]));
String addressStrGreaterThan = addressGreaterThan.zeroOnes();
String addressBinGreaterThan = addressStrGreaterThan.substring(23);
outputs[i] = branchIfGreaterThanOp + ccGreaterThan + signGreaterThan + addressBinGreaterThan;
break;
case "push":
String pushOp = "0110";
String middlePush = "00000000";
outputs[i] = pushOp + middlePush + getRegister(splitStrings[1]);
break;
case "pop":
String popOp = "0110";
String middlePop = "01000000";
outputs[i] = popOp + middlePop + getRegister(splitStrings[1]);
break;
case "call":
String callOp = "0110";
String middleCall = "10";
longword addressCall = new longword();
addressCall.set(Integer.parseInt(splitStrings[1]));
String addressCallStr = addressCall.zeroOnes();
String addressBinCall = addressCallStr.substring(22);
outputs[i] = callOp + middleCall + addressBinCall;
break;
case "return":
String returnOp = "0110";
String middleReturn = "110000000000";
outputs[i] = returnOp + middleReturn;
break;
default:
//default case, halt.
outputs[i] = "0000000000000000";
break;
}
}
return outputs;
}
public static String getRegister(String register)
{
//from the switch, return the correct op code
switch(register)
{
case "R0":
return "0000";
case "R1":
return "0001";
case "R2":
return "0010";
case "R3":
return "0011";
case "R4":
return "0100";
case "R5":
return "0101";
case "R6":
return "0110";
case "R7":
return "0111";
case "R8":
return "1000";
case "R9":
return "1001";
case "R10":
return "1010";
case "R11":
return "1011";
case "R12":
return "1100";
case "R13":
return "1101";
case "R14":
return "1110";
case "R15":
return "1111";
default:
return "";
}
}
}