public void Continue()
{
while (GetFlag(F.Halt) == false)
{
IP = XP;
try
{
InstructionSet.Get(Next()).Execute(this);
}
catch (ArgumentOutOfRangeException e)
{
Console.WriteLine(e.Message);
}
}
SetFlag(F.Halt, false);
}
public static int[] Parse(string program)
{
var code = new List <int>();
var lines = program.Split('\n');
int xp = 0;
int lineNumber;
// Registers positions in registry memory
regIds["r0"] = 0;
regIds["r1"] = 1;
regIds["r2"] = 2;
regIds["r3"] = 3;
regIds["r4"] = 4;
regIds["r5"] = 5;
regIds["r6"] = 6;
regIds["r7"] = 7;
regIds["xp"] = 15;
regIds["ip"] = 16;
regIds["sp"] = 17;
regIds["rp"] = 25;
regIds["exp"] = 28;
regIds["eip"] = 29;
// Search for labels
for (lineNumber = 0; lineNumber < lines.Length; lineNumber++)
{
string line = lines[lineNumber].Trim();
if (line.Length == 0 || line[0] == '#')
{
continue;
}
if (line[0] == '.')
{
// Line starts with a label
string label = line.Split(' ')[0].TrimEnd(':');
labels[label] = xp;
// Strips label from the line
line = line.Substring(line.Split(' ')[0].Length).Trim();
if (line.Length == 0 || line[0] == '#')
{
continue;
}
}
string command = line.Split(' ')[0].ToLower();
Instruction instr = InstructionSet.GetInstructionByName(command);
if (instr.Name == "cstr")
{
xp += line.Substring(command.Length + 1).Trim().Trim('\"').Length + 2;
}
else
{
xp += instr.NumOperands + 1;
}
}
foreach (var kp in labels)
{
Console.WriteLine(string.Format("{0} = {1}", kp.Key, kp.Value));
}
for (lineNumber = 0; lineNumber < lines.Length; lineNumber++)
{
string line = lines[lineNumber].Trim();
if (line.Length == 0 || line[0] == '#')
{
continue;
}
if (line[0] == '.')
{
// Strips label from the line
line = line.Substring(line.Split(' ')[0].Length).Trim();
if (line.Length == 0 || line[0] == '#')
{
continue;
}
}
string command = line.Split(' ')[0].ToLower();
Instruction instr = InstructionSet.GetInstructionByName(command);
code.Add(instr.Opcode);
line = line.Substring(command.Length).Trim();
if (line.Length == 0)
{
if (instr.NumOperands == 0)
{
continue;
}
else
{
throw new FormatException(string.Format("Line {0}: Invalid number of operands for {1}; expected {2}, received zero.", lineNumber + 1, command, instr.NumOperands));
}
}
else if (instr.NumOperands == 0)
{
throw new FormatException(string.Format("Line {0}: Instruction {1} receives no operands.", lineNumber + 1, command));
}
if (instr.Name == "cstr")
{
if (!line.StartsWith("\"") || !line.EndsWith("\""))
{
throw new FormatException(string.Format("Line {0}: Invalid operand format; expected C string, received '{1}'.", lineNumber + 1, line));
}
foreach (int c in line.Trim('"'))
{
code.Add(c);
}
code.Add(0);
continue;
}
string[] operands = line.Split(',');
if (operands.Length != instr.NumOperands)
{
throw new FormatException(string.Format("Line {0}: Invalid number of operands for {1}; expected {2}, received {3}", lineNumber + 1, command, instr.NumOperands, operands.Length));
}
for (int oi = 0; oi < instr.NumOperands; oi++)
{
string oper = operands[oi].Trim();
if (oper.Length == 0)
{
throw new ArgumentException(string.Format("Line {0}: Empty operand for {1}", lineNumber + 1, command));
}
switch (instr.Format[oi])
{
case 'a':
if (oper[0] == '.')
{
if (labels.ContainsKey(oper))
{
code.Add(labels[oper]);
}
else
{
throw new KeyNotFoundException(string.Format("Line {0}: Undefined label '{1}'.", lineNumber + 1, oper));
}
}
else
{
code.Add(int.Parse(oper));
}
break;
case 'i':
if (oper[0] == '\'')
{
if (oper.Length != 2)
{
throw new ArgumentException(string.Format("Line {0}: Invalid char to int conversion for operand {1}.", lineNumber + 1, oi + 1));
}
code.Add(oper[1]);
}
else
{
code.Add(int.Parse(oper));
}
break;
case 'r':
string regId = oper.ToLower();
if (regIds.ContainsKey(regId))
{
code.Add(regIds[oper.ToLower()]);
}
else
{
throw new KeyNotFoundException(string.Format("Line {0}: Invalid register name.", lineNumber + 1));
}
break;
default:
throw new ArgumentException(string.Format("Line {0}: Invalid operand {1}.", lineNumber + 1, oi + 1));
}
}
}
return(code.ToArray());
}
