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namespace aoc2019;
public class IntCodeVM
{
public enum HaltType
{
Terminate,
Waiting
}
private readonly Queue<long> input;
public readonly Queue<long> Output;
private readonly long[] program;
private long i;
public long[] Memory;
private long relativeBase;
public IntCodeVM(string tape)
{
i = 0;
relativeBase = 0;
program = tape.Split(',').Select(long.Parse).ToArray();
Memory = program;
input = new();
Output = new();
}
public long Result => Output.Dequeue();
public void Reset()
{
i = 0;
relativeBase = 0;
Memory = program;
input.Clear();
Output.Clear();
}
public void AddInput(params long[] values)
{
foreach (var v in values) AddInput(v);
}
public void AddInput(long value)
{
input.Enqueue(value);
}
private long MemGet(long addr)
{
return addr < Memory.Length ? Memory[addr] : 0;
}
private void MemSet(long addr, long value)
{
if (addr < 0) addr = 0;
if (addr >= Memory.Length)
Array.Resize(ref Memory, (int)addr + 1);
Memory[addr] = value;
}
private long Mode(long idx)
{
var mode = MemGet(i) / 100;
for (var s = 1; s < idx; s++)
mode /= 10;
return mode % 10;
}
private long Get(long idx)
{
var param = MemGet(i + idx);
return Mode(idx) switch
{
0 => MemGet(param),
1 => param,
2 => MemGet(relativeBase + param),
_ => throw new("invalid parameter mode")
};
}
private void Set(long idx, long val)
{
var param = MemGet(i + idx);
switch (Mode(idx))
{
case 0:
MemSet(param, val);
break;
case 1: throw new("cannot set in immediate mode");
case 2:
MemSet(relativeBase + param, val);
break;
default: throw new("invalid parameter mode");
}
}
public HaltType Run(params long[] additionalInput)
{
foreach (var s in additionalInput) AddInput(s);
return Run();
}
public HaltType Run()
{
while (i < Memory.Length)
{
var op = MemGet(i) % 100;
switch (op)
{
case 1:
Set(3, Get(1) + Get(2));
i += 4;
break;
case 2:
Set(3, Get(1) * Get(2));
i += 4;
break;
case 3:
if (!input.Any())
return HaltType.Waiting;
Set(1, input.Dequeue());
i += 2;
break;
case 4:
Output.Enqueue(Get(1));
i += 2;
break;
case 5:
i = Get(1) == 0 ? i + 3 : Get(2);
break;
case 6:
i = Get(1) != 0 ? i + 3 : Get(2);
break;
case 7:
Set(3, Get(1) < Get(2) ? 1 : 0);
i += 4;
break;
case 8:
Set(3, Get(1) == Get(2) ? 1 : 0);
i += 4;
break;
case 9:
relativeBase += Get(1);
i += 2;
break;
case 99:
return HaltType.Terminate;
default:
throw new($"unknown op {op} at {i}");
}
}
return HaltType.Terminate;
}
}
|
