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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ShiftOS.Engine;
using ShiftOS.Objects.ShiftFS;
namespace ShiftOS.Modding.VirtualMachine
{
[Launcher("ShiftOS Virtual Machine", false)]
public partial class Form1 : UserControl, IShiftOSWindow
{
private byte[] memory = null; //program binary
private int programCounter = 0; //current byte
private Stack<int> stack = null; //stack
private int[] registers = null; //registers
private int currentRegister = 0;
public Form1()
{
InitializeComponent();
}
public void OnLoad()
{
}
public void Execute()
{
switch ((OpCodes)memory[programCounter])
{
case OpCodes.DoNothing:
break;
case OpCodes.Add:
registers[currentRegister] = registers[currentRegister] + registers[currentRegister + 1];
break;
case OpCodes.Subtract:
registers[currentRegister] = registers[currentRegister] - registers[currentRegister + 1];
break;
case OpCodes.Multiply:
registers[currentRegister] = registers[currentRegister] * registers[currentRegister + 1];
break;
case OpCodes.Divide:
registers[currentRegister] = registers[currentRegister] / registers[currentRegister + 1];
break;
case OpCodes.Increment:
registers[currentRegister]++;
break;
case OpCodes.Decrement:
registers[currentRegister]--;
break;
case OpCodes.MoveUp:
currentRegister++;
break;
case OpCodes.MoveDown:
currentRegister--;
break;
case OpCodes.Error:
Infobox.Show("Error", "An error has occurred inside the VM, we will now halt it.");
break;
case OpCodes.Jump:
stack.Push(programCounter);
programCounter = registers[currentRegister];
break;
case OpCodes.Zero:
registers[currentRegister] = 0;
break;
case OpCodes.Return:
programCounter = memory.Length;
break;
case OpCodes.JumpBack:
programCounter = stack.Pop();
break;
case OpCodes.Out:
Console.Write(registers[currentRegister]);
break;
}
}
public void OnSkinLoad()
{
}
public bool OnUnload()
{
return true;
}
public void OnUpgrade()
{
}
private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
AppearanceManager.Close(this);
}
public void Start()
{
var th = new System.Threading.Thread(() =>
{
while(programCounter < memory.Length)
{
Execute();
programCounter++;
}
});
th.IsBackground = true;
th.Start();
}
private void openBinaryToolStripMenuItem_Click(object sender, EventArgs e)
{
FileSkimmerBackend.GetFile(new[] { ".svm" }, FileOpenerStyle.Open, new Action<string>((program) =>
{
memory = Utils.ReadAllBytes(program);
programCounter = 0;
stack = new Stack<int>();
registers = new int[64000];
currentRegister = 0;
Start();
}));
}
}
[Namespace("svm")]
public static class Compiler
{
public static byte[] Compile(string prg)
{
List<OpCodes> program = new List<OpCodes>();
foreach(var statement in prg.Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries))
{
if (!string.IsNullOrEmpty(statement))
{
string[] statements = statement.Split(' ');
switch (statements[0])
{
case "increment":
program.Add(OpCodes.Increment);
break;
case "decrement":
program.Add(OpCodes.Decrement);
break;
case "mvup":
program.Add(OpCodes.MoveUp);
break;
case "mvdn":
program.Add(OpCodes.MoveDown);
break;
case "set":
program.Add(OpCodes.Zero);
for(int i = 0; i <= Convert.ToInt32(statements[1]); i++)
{
program.Add(OpCodes.Increment);
}
break;
case "+":
program.Add(OpCodes.Add);
break;
case "-":
program.Add(OpCodes.Subtract);
break;
case "*":
program.Add(OpCodes.Multiply);
break;
case "/":
program.Add(OpCodes.Divide);
break;
case "out":
program.Add(OpCodes.Out);
break;
case "return":
program.Add(OpCodes.Return);
break;
case "jump":
program.Add(OpCodes.Jump);
break;
case "back":
program.Add(OpCodes.JumpBack);
break;
}
}
}
byte[] newPrg = new byte[program.Count];
foreach(var oc in program)
{
newPrg[program.IndexOf(oc)] = (byte)oc;
}
return newPrg;
}
[Command("compile")]
[RequiresArgument("input")]
[RequiresArgument("output")]
public static bool CompileCommand(Dictionary<string, object> args)
{
string input = args["input"] as string;
string output = args["output"] as string;
if (!Utils.FileExists(input))
{
Console.WriteLine("The file you requested does not exist.");
return true;
}
if (!output.EndsWith(".svm"))
output += ".svm";
byte[] program = Compile(Utils.ReadAllText(input));
Utils.WriteAllBytes(output, program);
return true;
}
[Command("read")]
[RequiresArgument("input")]
public static bool ReadFile(Dictionary<string, object> args)
{
string input = args["input"] as string;
if (Utils.FileExists(input))
{
foreach(var b in Utils.ReadAllBytes(input))
{
Console.WriteLine((OpCodes)b);
}
}
else
{
Console.WriteLine("File doesn't exist.");
}
return true;
}
}
public enum OpCodes : byte
{
DoNothing = 0x00,
Zero = 0x11,
Add = 0x01,
Subtract = 0x02,
Multiply = 0x03,
Divide = 0x04,
MoveUp = 0x05,
MoveDown = 0x051,
Increment = 0x06,
Decrement = 0x061,
Out = 0x07,
Jump = 0x08,
Return = 0x081,
JumpBack = 0x082,
Error = 0x9,
}
}
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