/// <summary>
/// Tries to handle any linkage declarations
/// </summary>
/// <param name="trimmedLine">The line with leading/trailing whitespace removed.</param>
/// <param name="lineNum">The current line number.</param>
/// <param name="objFile">The basic object file that will be written to.</param>
/// <returns>Returns true if a linkage directive was processed in this line. Otherwise, returns false.</returns>
private bool TryHandlingLinkageDeclaration(string trimmedLine, int lineNum, BasicObjectFile objFile)
{
// tokenize the line;
string[] tokens = trimmedLine.Split(' ');
bool isLinkageDec = false;
if (IsLinkageDeclaration(tokens[0]))
{
isLinkageDec = true;
// we expect three tokens,
if (tokens[0] == ".extern")
{
int declarationSize = 0;
if (tokens.Length != 3)
{
throw new AssemblyException(lineNum, "Expected symbol name and byte size declaration after .extern token.");
}
else if (!int.TryParse(tokens[2], out declarationSize))
{
throw new AssemblyException(lineNum, ".extern requires a non-negative 32-bit integer size.");
}
else if (declarationSize < 0)
{
throw new AssemblyException(lineNum, ".extern requires a non-negative 32-bit integer size.");
}
else
{
objFile.AddExternElement(declarationSize);
}
}
}
return(isLinkageDec);
}
