public int Tick()
{
if (skipNext)
{
GetInstruction();
this.skipNext = false;
}
#if DEBUG
if (this.ram.Ram[this.registers.ProgramCounter] == 0) return 0;
#endif
var ins = GetInstruction();
this.currentInstruction = ins;
int cost = GetCost(ins);
switch (ins.instruction)
{
case 0x0:
switch (ins.a)
{
case 0x01:
this.Jsr(ins.b);
break;
default:
break;
}
break;
case 0x1:
this.Set(ins.a, ins.b);
break;
case 0x2:
DoMathOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x + y), (x, y) => (ushort) ((x + y) > 0xffff ? 0x0001 : 0x0000));
break;
case 0x3:
DoMathOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x - y), (x, y) => (ushort) (x < y ? 0xffff : 0x0000));
break;
case 0x4:
DoMathOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x*y), (x, y) => (ushort) (((x*y) >> 16) & 0xffff));
break;
case 0x5:
DoMathOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x/y), (x, y) => (ushort) (((x << 16)/y) & 0xffff), (y) => y != 0, () => this.registers.OverFlow = 0);
break;
case 0x6:
DoMathOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x%y), (x, y) => 0, (y) => y != 0, () => 0);
break;
case 0x7:
DoMathOp(Tuple.Create(GetSource(ins.a)(), (ushort) ins.b), GetDestination(ins.a), (x, y) => (ushort) (x << y), (x, y) => (ushort) (((x << y) >> 16) & 0xffff));
break;
case 0x8:
DoMathOp(Tuple.Create(GetSource(ins.a)(), (ushort) ins.b), GetDestination(ins.a), (x, y) => (ushort) (x >> y), (x, y) => (ushort) (((x << 16) >> y) & 0xffff));
break;
case 0x9:
DoBinaryOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x & y));
break;
case 0xa:
DoBinaryOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x | y));
break;
case 0xb:
DoBinaryOp(ResolveSources(ins.a, ins.b), GetDestination(ins.a), (x, y) => (ushort) (x ^ y));
break;
case 0xc:
ShouldSkipNextIf(ResolveSources(ins.a, ins.b), (x, y) => (x != y));
break;
case 0xd:
ShouldSkipNextIf(ResolveSources(ins.a, ins.b), (x, y) => (x == y));
break;
case 0xe:
ShouldSkipNextIf(ResolveSources(ins.a, ins.b), (x, y) => (x <= y));
break;
case 0xf:
ShouldSkipNextIf(ResolveSources(ins.a, ins.b), (x, y) => (x & y) == 0);
break;
default:
throw new NotImplementedException("Run");
}
return cost;
}
public Action<ushort> GetDestination(byte value, Instruction instruction)
{
ushort val;
short offset = this.offsetProvider.GetOffset(instruction);
switch (value)
{
case 0x0:
return v => this.registers.A = v;
case 0x1:
return v => this.registers.B = v;
case 0x2:
return v => this.registers.C = v;
case 0x3:
return v => this.registers.X = v;
case 0x4:
return v => this.registers.Y = v;
case 0x5:
return v => this.registers.Z = v;
case 0x6:
return v => this.registers.I = v;
case 0x7:
return v => this.registers.J = v;
case 0x08:
return v => this.ram.Ram[this.registers.A] = v;
case 0x09:
return v => this.ram.Ram[this.registers.B] = v;
case 0x0a:
return v => this.ram.Ram[this.registers.C] = v;
case 0x0b:
return v => this.ram.Ram[this.registers.X] = v;
case 0x0c:
return v => this.ram.Ram[this.registers.Y] = v;
case 0x0d:
return v => this.ram.Ram[this.registers.Z] = v;
case 0x0e:
return v => this.ram.Ram[this.registers.I] = v;
case 0x0f:
return v => this.ram.Ram[this.registers.J] = v;
case 0x10:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.A] = v;
case 0x11:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.B] = v;
case 0x12:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.C] = v;
case 0x13:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.X] = v;
case 0x14:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.Y] = v;
case 0x15:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.Z] = v;
case 0x16:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.I] = v;
case 0x17:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val + this.registers.J] = v;
case 0x1a:
return v => this.ram.Ram[--this.registers.StackPointer] = v;
case 0x1b:
return v => this.registers.StackPointer = v;
case 0x1c:
this.registers.ProgramCounterManipulated= true;
return v => this.registers.ProgramCounter = v;
case 0x1d:
return v => this.registers.OverFlow = v;
case 0x1e:
val = this.ram.Ram[this.registers.ProgramCounter + offset];
return v => this.ram.Ram[val] = v;
case 0x1f:
return v => this.ram.Ram[this.registers.ProgramCounter + offset] = v;
default:
throw new NotImplementedException("GetDestination");
}
}
private int GetCost(Instruction instruction)
{
return this.costCalculator.CalculateCost(instruction);
}