private void AddAssemblerDirectiveToken(List <Token> tokens, string str, EnumAssemblerDirectives assemblerDirective)
{
Token tkn = new Token(str);
tkn.AddProperty(EnumTokenProperties.TokenType, (Int64)EnumTokenTypes.AssemblerDirective);
tkn.AddProperty(EnumTokenProperties.AssemblerDirective, (Int64)assemblerDirective);
tokens.Add(tkn);
}
private void AddAddressRegisterToken(List <Token> tokens, string str, EnumRegisters registerEnum)
{
Token tkn = new Token(str);
tkn.AddProperty(EnumTokenProperties.TokenType, (Int64)EnumTokenTypes.AddressRegister);
tkn.AddProperty(EnumTokenProperties.RegisterNumber, (Int64)registerEnum);
tokens.Add(tkn);
}
public void AddInstructionToken(List <Token> tokens, string str, EnumInstructions instructionEnum, EnumInstructionSizes instructionSize = EnumInstructionSizes.Long)
{
Token tkn = new Token(str);
tkn.AddProperty(EnumTokenProperties.TokenType, (Int64)EnumTokenTypes.Instruction);
tkn.AddProperty(EnumTokenProperties.RealInstruction, (Int64)instructionEnum);
tkn.AddProperty(EnumTokenProperties.InstructionSize, (Int64)instructionSize);
tokens.Add(tkn);
}
public bool ResolveLabels()
{
//Resolves labels on the Token File.
//Loop through all token lines and replace instances of label tokens with respective immediate tokens
for (int i = 0; i < File.Count; i++)
{
int index = File[i].ReturnLabelIndex();
if (index >= 0)
{
string labelText = File[i].Tokens[index].Text;
Int64 replaceLiteral = 0;
if (LabelTable.ContainsKey(labelText))
{
replaceLiteral = LabelTable[labelText];
}
else
{
throw new FoundUnexpectedToken(File[i].Tokens[index].DeepCopy(), "Could not find label in label table");
return(false);
}
Token replacement = new Token((int)EnumTokenTypes.Immediate, "$" + replaceLiteral.ToString());
replacement.AddProperty(EnumTokenProperties.ImmediateValue, replaceLiteral);
File[i].Tokens[index] = replacement;
}
continue;
}
return(true);
}
/// <summary>
/// This loops through every unit in the string and determines if each one is a label, immediate, instruction etc.
/// </summary>
/// <returns></returns>
private bool SimpleKeywordParse(string[] units, ref Token[] tokens)
{
tokens = new Token[units.Length];
for (int i = 0; i < units.Length; i++)
{
Token temp = null;
if (YKeywords.IsKeyword(units[i], ref temp))
{
//First, check if the string is an existing keyword.
//If not, it will be a label, immediate, or an address register with offset
tokens[i] = temp;
}
else
{
//The first instruction can also be a label
if (units[i].EndsWith(':'))
{
//label
tokens[i] = new Token((int)EnumTokenTypes.Label, units[i]);
continue;
}
if (units[i].StartsWith('$'))
{
//Can be an immediate, or an address register with offset
Int64 ImmediateVal = 0;
if (units[i].Contains("("))
{
//Address register with offset, error if no immediate!
int j = units[i].IndexOf("(");
ImmediateVal = MathConversion.ParseImmediate(units[i].Substring(0, j - 1));
units[i] = units[i].Substring(j);
if (YKeywords.IsKeyword(units[i], ref temp))
{
temp.AddProperty(EnumTokenProperties.ImmediateValue, ImmediateVal); //ImmediateValue holds the offset!
tokens[i] = temp;
continue;
}
}
ImmediateVal = MathConversion.ParseImmediate(units[i]);
tokens[i] = new Token((int)EnumTokenTypes.Immediate, units[i]);
tokens[i].AddProperty(EnumTokenProperties.ImmediateValue, ImmediateVal);
continue;
}
tokens[i] = new Token((int)EnumTokenTypes.Unkown, units[i]);
continue;
}
}
return(true);
}
