public override void Interpret(SourceCrawler sourceCrawler, BinaryWriter output, bool isLabelScan)
{
// Eat whitespace to right of mnemonic
sourceCrawler.EatWhitespace();
// Peek at the next character, if it is a literal delimiter, we parse a literal, otherwise we parse a register
if (sourceCrawler.Peek() == CompilerSettings.LiteralDelimiter)
{
// Pass over delimiter
sourceCrawler.CurrentNdx++;
// Read hard-coded location
uint value = sourceCrawler.ReadWordValue();
// Add the correct size to the assembly length
sourceCrawler.AssemblyLength += (uint)(1 + CompilerSettings.WORD_LENGTH);
// If this is not a label scanning pass, write to output
if (!isLabelScan)
{
output.Write(ByteCodes[0]); // 0x34
output.Write(value);
}
}
// This is not a literal location, check for register
else if (sourceCrawler.Peek() == CompilerSettings.RegisterDelimiter)
{
// Pass over delimiter
sourceCrawler.CurrentNdx++;
// Read register
RegisterAddress sourceRegister = sourceCrawler.ReadRegister();
// This instruction is 3 bytes wide
sourceCrawler.AssemblyLength += (1 + 1);
// If this is not a label scanning pass, write to output
if (!isLabelScan)
{
output.Write(ByteCodes[1]); // 0x35
output.Write((byte)sourceRegister);
}
}
else if (sourceCrawler.Peek() == CompilerSettings.ConstantDelimiter)
{
string constant = "";
while (!char.IsWhiteSpace(sourceCrawler.Peek()))
{
constant += sourceCrawler.Get();
}
if (constant.Equals("_ret_addr_"))
{
sourceCrawler.AssemblyLength += 1 + 1;
if (!isLabelScan)
{
output.Write(ByteCodes[1]); // 0x35
output.Write((byte)0xF0);
}
}
}
}