// 代表启动计算机
public void start() {
memory.read();
memory.write();
cpu.read();
cpu.write();
disk.read();
disk.write();
}
public void run() {
try {
int opCode;
while (true) {
opCode = programMemory.read(programCounter);
programCounter++;
ioSystem.displayRuntimeError("@" + (programCounter - 1) + ": ");
switch (opCode) {
case HALT:
{
this.ioSystem.displayProgramTermination();
return;
}
case PUSH:
{
expStack.push(programMemory.read(programCounter));
programCounter++;
break;
}
case ADD:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(a + b);
break;
}
case SUB:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(a - b);
break;
}
case MUL:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(a * b);
break;
}
case DIV:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(a / b);
break;
}
case MOD:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(a % b);
break;
}
case NEG:
{
int a = expStack.pop();
expStack.push(-a);
break;
}
case LT:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(b < a ? 0 : 1);
break;
}
case LE:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(b <= a ? 0 : 1);
break;
}
case GT:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(b > a ? 0 : 1);
break;
}
case GE:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(b >= a ? 0 : 1);
break;
}
case EQ:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(b == a ? 0 : 1);
break;
}
case NE:
{
int a = expStack.pop();
int b = expStack.pop();
expStack.push(b != a ? 0 : 1);
break;
}
case IN:
{
int a = ioSystem.read();
expStack.push(a);
break;
}
case OUT:
{
ioSystem.write(expStack.pop());
break;
}
case CALL:
{
callStack.push(programCounter);
break;
}
case RET:
{
programCounter = callStack.pop();
break;
}
case JP:
{
programCounter = programMemory.read(programCounter);
break;
}
case JZ:
{
int a = expStack.pop();
if (a == 0) programCounter = a;
break;
}
case DUP:
{
expStack.dup();
break;
}
case POP:
{
expStack.pop();
break;
}
default:
{
ioSystem.displayRuntimeError("Bad instruction");
return;
}
}
}
} catch (AddressOutOfBoundsException e) {
ioSystem.displayRuntimeError("Adress out of bounds.");
} catch (IOException e) {
ioSystem.displayRuntimeError("Error with IO system.");
} catch (StackOverflowException e) {
ioSystem.displayRuntimeError("Stack overflow.");
} catch (StackUnderflowException e) {
ioSystem.displayRuntimeError("Stack underflow.");
}
}
