public void parseToken(String value)
throws MemoryFullException, MemoryEmptyException, InvalidOperationException,
InvalidTokenException {
Token token = TokenFactory.buildToken(value);
if (token instanceof ValueToken) {
ValueToken valueToken = (ValueToken) token;
registers.push(valueToken.getValue());
} else if (token instanceof UnaryOperatorToken) {
UnaryOperatorToken unaryToken = (UnaryOperatorToken) token;
if (registers.size() < 1) {
throw new InvalidOperationException("Not enough operands.");
}
double op1 = registers.pop();
double res = unaryToken.getUnaryOperation().doOperation(op1);
registers.push(res);
} else if (token instanceof BinaryOperatorToken) {
BinaryOperatorToken binaryToken = (BinaryOperatorToken) token;
if (registers.size() < 2) {
throw new InvalidOperationException("Not enough operands.");
}
double op1 = registers.pop();
double op2 = registers.pop();
double res = binaryToken.getBinaryOperation().doOperation(op2, op1);
registers.push(res);
}
}
/*
* Function : parseInstruction
* Description : Parses the IType instructions without displacements.
*/
public static ITypeImmediate parseInstruction(String instruction, int address) {
ITypeImmediate instruct = new ITypeImmediate();
// set the icode
instruct.icode = IMap.get(Instruction.getIcodeName(instruction));
// grab the string from the registers.java class that we will use to match registers
Pattern registerPattern = Pattern.compile(Registers.registerString());
Matcher registerMatcher = registerPattern.matcher(instruction);
// match the first register if there is one
if (registerMatcher.find()) {
instruct.rd = Registers.registerValue(registerMatcher.group(0));
// I clear off the bits we've already read
instruction = instruction.substring(registerMatcher.end(0));
}
// match the second register if we can
if (registerMatcher.find()) {
instruct.r1 = Registers.registerValue(registerMatcher.group(0));
}
// This regex attempts to match a label name. The [^\\s\\d] means not a space or digit character
// This ensures that the label is infact a valid label and does not start with a number.
Pattern symbolPattern = Pattern.compile("\\b([^\\d\\s][^\\s]*)\\b$");
Matcher symbolMatcher = symbolPattern.matcher(instruction);
Pattern literalPattern = Pattern.compile("\\b(0x)?\\d+\\b");
Matcher literalMatcher = literalPattern.matcher(instruction);
if (symbolMatcher.find()) {
SymbolTable symbolTable = SymbolTable.getInstance();
instruct.immediateValue = symbolTable.getSymbol(symbolMatcher.group(0).replace(" ", ""));
if (instruct.icode == BEQZ || instruct.icode == BNEZ) {
instruct.r1 = instruct.rd;
instruct.rd = 0;
instruct.immediateValue = instruct.immediateValue - (address + 4);
}
} else if (literalMatcher.find()) {
instruct.immediateValue = Tools.processNumber(literalMatcher.group(0).replace(" ", ""));
} else {
instruct.r1 = instruct.rd;
instruct.rd = 0;
}
return instruct;
}
