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awful gross method got awfuller and grosser
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/** | |
* Evaluates the command at the program counter. | |
*/ | |
public void eval() { | |
int currentInstruction = ram[counter.getModule()][counter.getIndex()]; | |
int tempA = 0x00000000; | |
int tempB = 0x00000000; | |
short address = 0x0000; | |
switch (currentInstruction) { | |
case 0x01: // STORE | |
address = Byte.parseByte(Integer.toString(currentInstruction) | |
.substring(3, 7)); | |
counter.increment(); | |
currentInstruction = ram[counter.getModule()][counter.getIndex()]; | |
writeToRAM(currentInstruction, parseHex(address)); | |
break; | |
case 0x02: // ADD | |
DataStack.push(DataStack.pop() + DataStack.pop()); | |
break; | |
case 0x03: // SUBTRACT | |
DataStack.push(DataStack.pop() - DataStack.pop()); | |
break; | |
case 0x04: // RSTORE | |
ReturnStack.push(DataStack.pop()); | |
break; | |
case 0x05: // FETCH | |
address = Byte.parseByte(Integer.toString(currentInstruction) | |
.substring(3, 7)); | |
DataStack.push(readFromRAM(parseHex(address))); | |
break; | |
case 0x06: // AND | |
DataStack.push(DataStack.pop() & DataStack.pop()); | |
break; | |
case 0x07: // DROP | |
DataStack.pop(); | |
break; | |
case 0x08: // DUP | |
DataStack.push(DataStack.pop()); | |
DataStack.push(DataStack.pop()); | |
break; | |
case 0x09: // OR | |
DataStack.push(DataStack.pop() ^ DataStack.pop()); | |
break; | |
case 0x0A: // OVER | |
break; | |
case 0x0B: // RFETCH | |
DataStack.push(ReturnStack.pop()); | |
break; | |
case 0x0C: // SWAP | |
tempA = DataStack.pop(); | |
tempB = DataStack.pop(); | |
DataStack.push(tempB); | |
DataStack.push(tempA); | |
break; | |
} | |
} |
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