/// <summary>
/// Increment the pass counter.
/// </summary>
/// <returns>The new value of the pass counter.</returns>
public int DoNewPass()
{
CurrentPass++;
SymbolManager.DefineGlobal("CURRENT_PASS", CurrentPass + 1);
PassChanged?.Invoke(this, new EventArgs());
PassNeeded = false;
return(CurrentPass);
}
/// <summary>
/// Creates a new instance of the assembly service.
/// </summary>
/// <param name="options">The parsed options.</param>
public AssemblyServices(Options options)
{
PassNeeded = true;
CurrentPass = -1;
IsReserved = new List <Func <StringView, bool> >();
InstructionLookupRules = new List <Func <StringView, bool> > {
sv => sv[0] == '.'
};
Options = options;
OutputFormat = Options.Format;
CPU = Options.CPU;
Encoding = new AsmEncoding(Options.CaseSensitive);
Evaluator = new Evaluator(Options.CaseSensitive)
{
SymbolEvaluator = EvaluateSymbol
};
SymbolManager = new SymbolManager(options.CaseSensitive, Evaluator);
SymbolManager.AddValidSymbolNameCriterion(s => !Evaluator.IsReserved(s));
Log = new ErrorLog(Options.WarningsAsErrors);
Output = new BinaryOutput(true, Options.CaseSensitive, Options.LongAddressing);
}
/// <summary>
/// Initializes the <see cref="Assembler"/> class for use. Repeated calls will reset symbol labels and variables,
/// assembling pass and listing printing states, the binary output, and the error log.
/// </summary>
/// <param name="args">The command line arguments passed by the user.</param>
public static void Initialize(string[] args)
{
PassChanged = null;
PrintOff = false;
PassNeeded = true;
_pass = -1;
LineIterator = null;
Options = new CommandLineOptions();
IsReserved = new List <Func <string, bool> >();
InstructionLookupRules = new List <Func <string, bool> >();
if (args != null)
{
Options.ParseArgs(args);
}
Encoding = new AsmEncoding(Options.CaseSensitive);
SymbolManager = new SymbolManager(Options.CaseSensitive);
Evaluator.Initialize();
Evaluator.AddFunctionEvaluator(SymbolManager);
Log = new ErrorLog();
Output = new BinaryOutput();
}
double EvaluateSymbol(RandomAccessIterator <Token> tokens)
{
var token = tokens.Current;
var subscript = -1;
var converted = double.NaN;
var isString = token.IsDoubleQuote();
if (char.IsLetter(token.Name[0]) || token.Name[0] == '_')
{
var next = tokens.GetNext();
if (next != null && next.IsOpen() && next.Name.Equals("["))
{
subscript = (int)Evaluator.Evaluate(tokens, 0, int.MaxValue);
}
var symbol = SymbolManager.GetSymbol(token, CurrentPass > 0);
if (symbol == null)
{
if (token.Line.Label != null && token.Line.Label.Name.Equals(token.Name, StringViewComparer))
{
throw new SymbolException(token, SymbolException.ExceptionReason.NotDefined);
}
PassNeeded = true;
return(0x100);
}
if (subscript >= 0)
{
if (symbol.StorageType != StorageType.Vector)
{
throw new SyntaxException(token.Position, "Type mismatch.");
}
if ((symbol.IsNumeric && subscript >= symbol.NumericVector.Count) ||
(!symbol.IsNumeric && subscript >= symbol.StringVector.Count))
{
throw new SyntaxException(token.Position, "Index was out of range.");
}
if (symbol.IsNumeric)
{
return(symbol.NumericVector[subscript]);
}
token = new Token(symbol.StringVector[subscript], TokenType.Operand);
isString = true;
}
else if (symbol.IsNumeric)
{
if (symbol.DataType == DataType.Address && symbol.Bank != Output.CurrentBank)
{
return((int)symbol.NumericValue | (symbol.Bank * 0x10000));
}
return(symbol.NumericValue);
}
else
{
token = new Token(symbol.StringValue, TokenType.Operand);
isString = true;
}
}
if (isString || token.IsQuote())
{
// is it a string literal?
var literal = token.IsQuote() ? token.Name.TrimOnce(token.Name[0]).ToString() : token.Name.ToString();
if (string.IsNullOrEmpty(literal))
{
throw new SyntaxException(token.Position, "Cannot evaluate empty string.");
}
literal = Regex.Unescape(literal);
if (!isString)
{
var charsize = 1;
if (char.IsSurrogate(literal[0]))
{
charsize++;
}
if (literal.Length > charsize)
{
throw new SyntaxException(token.Position, "Invalid char literal.");
}
}
// get the integral equivalent from the code points in the string
converted = Encoding.GetEncodedValue(literal);
}
else if (token.Name.Equals("*"))
{ // get the program counter
converted = Output.LogicalPC;
}
else if (token.Name[0].IsSpecialOperator())
{ // get the special character value
if (token.Name[0] == '+' && CurrentPass == 0)
{
converted = Output.LogicalPC;
PassNeeded = true;
}
else
{
converted = SymbolManager.GetLineReference(token.Name, token);
if (double.IsNaN(converted))
{
var reason = token.Name[0] == '+' ? SymbolException.ExceptionReason.InvalidForwardReference :
SymbolException.ExceptionReason.InvalidBackReference;
throw new SymbolException(token, reason);
}
}
}
if (double.IsNaN(converted))
{
throw new ExpressionException(token.Position,
$"\"{token.Name}\" is not a expression.");
}
return(converted);
}
