public void SetValue(Romulus.StringSection name, LiteralValue value, bool isFixed, out Error error)
{
error = Error.None;
if (assembler.CurrentPass == null)
{
throw new InvalidOperationException("Can only access variables when assembler is running a pass.");
}
bool isDollar = Romulus.StringSection.Compare(name, "$", true) == 0;
if (isDollar)
{
assembler.CurrentPass.SetAddress(value.Value);
}
string nameString = name.ToString();
//assembler.CurrentPass.Values.Remove(nameString);
//assembler.CurrentPass.Values.Add(nameString, value);
bool fixedValueError;
assembler.CurrentPass.Values.SetValue(nameString, value, isFixed, out fixedValueError);
if (fixedValueError)
{
// Todo: replace this with assembler value, or return fixedValueError somehow.
//throw new Exception("Attempted to assign to a fixed value. This exception should be replaced with an appropriate assembler error.");
error = new Error(ErrorCode.Value_Already_Defined, string.Format(Error.Msg_ValueAlreadyDefined_name, nameString));
}
}
public bool TryGetValue(Romulus.StringSection name, out LiteralValue result)
{
bool isDollar = Romulus.StringSection.Compare(name, "$", true) == 0;
if (isDollar)
{
result = new LiteralValue((ushort)assembler.CurrentPass.CurrentAddress, false);
return(true);
}
var value = assembler.CurrentPass.Values.TryGetValue(name.ToString());
result = value.HasValue ? value.Value : default(LiteralValue);
return(value.HasValue);
}
public LiteralValue GetValue(Romulus.StringSection name)
{
bool isDollar = Romulus.StringSection.Compare(name, "$", true) == 0;
if (isDollar)
{
return(new LiteralValue((ushort)assembler.CurrentPass.CurrentAddress, false));
}
LiteralValue?result;
if (null == (result = assembler.CurrentPass.Values.TryGetValue(name.ToString())))
{
throw new Exception(); // Todo: Must be more specific, and handled!
}
return(result.Value);
}