public void Cycle()
{
OpCode ins = (OpCode)Code[PC++];
List <int> args = new List <int>();
if (false && ins.HasAttribute <OpWithArgumentAttribute>())
{
OpWithArgumentAttribute a = ins.GetAttribute <OpWithArgumentAttribute>();
for (int i = 0; i < a.Arguments; ++i)
{
args.Add(Code[PC++]);
}
}
switch (ins)
{
case OpCode.LEA_CODE:
A = Code[BP + Code[PC++]];
break;
case OpCode.LEA_DATA:
A = Data[BP + Code[PC++]];
break;
case OpCode.JMP:
PC = Code[PC];
break;
case OpCode.JZ:
PC = (A == 0) ? Code[PC] : PC + 1;
break;
case OpCode.JNZ:
PC = (A != 0) ? Code[PC] : PC + 1;
break;
case OpCode.PUSH:
Stack[--SP] = A;
break;
case OpCode.POP:
A = Stack[++SP];
break;
case OpCode.ENTER:
Stack[--SP] = BP;
BP = SP;
SP -= Code[PC++];
break;
case OpCode.ADJUST:
SP -= Code[PC++];
break;
case OpCode.LEAVE:
SP = BP;
BP = Stack[SP++];
PC = Stack[SP++];
break;
case OpCode.DEBUG3:
Console.Write("D3 ");
for (int i = 0; i < 3; ++i)
{
Console.Write("{0}", args[i]);
}
Console.WriteLine();
break;
case OpCode.DEBUG_STATE:
Console.WriteLine("Machine State:");
Console.WriteLine(" A: {0} IP: 0x{1:X} SP: 0x{2:X} BP: 0x{3:X}",
A, PC, SP, BP);
break;
}
}
public static byte GetLength(this OpCode p)
{
var attr = p.GetAttribute <OpCodeInfoAttribute>();
return(attr.Length);
}
public static bool HasArgument(this OpCode value)
{
var attribute = value.GetAttribute <HasArgumentAttribute>();
return(attribute != null);
}
