/// <summary>
/// Populates an existing symbol table with symbols parsed from the desired segment.
/// </summary>
/// <param name="reader">A StreamReader instance that will read the input assembly file.</param>
/// <param name="desiredSegment">The program segment to parse symbols from.</param>
/// <param name="symTable">The SymbolTable instance to populate.</param>
public void GenerateSymbolTableForSegment(StreamReader reader, SegmentType desiredSegment, SymbolTable symTable)
{
SegmentType currSegmentType = SegmentType.Invalid;
int currAlignment = CommonConstants.DEFAULT_ALIGNMENT;
// a list of all exceptions we encounter during parsing.
// users can view them all at once instead of working through them piecemeal.
var exceptionList = new List <AssemblyException>();
int lineNum = 0;
while (!reader.EndOfStream)
{
try
{
++lineNum;
// trim the whitespace from any read-in line.
string line = reader.ReadLine().Trim();
// get a substring up until the commented line, ignoring those in user quotes.
line = ParserCommon.GetSanitizedString(line);
// ignore blank lines. trim should remove all whitespace
try
{
if (!string.IsNullOrWhiteSpace(line))
{
LineParseResults directiveResults = ParserCommon.HandleAssemblerDirective(line, lineNum, currSegmentType, currAlignment);
currAlignment = directiveResults.NewAlignment;
currSegmentType = directiveResults.NewSegment;
// further processing is needed, and the current segment type is the desired segment type.
if (!directiveResults.IsLineAssemblerDirective &&
currSegmentType == desiredSegment)
{
if (!TryHandlingLinkageDeclaration(line, lineNum, currSegmentType, symTable))
{
ISymbolTableBuilder segParser = m_SymbolBuilderFac.GetParserForSegment(lineNum, currSegmentType);
var asmLine = new LineData(line, lineNum);
segParser.ParseSymbolsInLine(asmLine, symTable, currAlignment);
}
}
}
}
catch (AssemblyException)
{
throw;
}
catch (Exception ex)
{
throw new AssemblyException(lineNum, ex.Message);
}
}
catch (AssemblyException ex)
{
exceptionList.Add(ex);
}
}
// if any exceptions were encountered, throw an aggregate exception with
// all of the encountered exceptions.
if (exceptionList.Any())
{
throw new AggregateAssemblyError(exceptionList);
}
// reset the StreamReader to the beginning position.
reader.Seek(0, SeekOrigin.Begin);
}
/// <summary>
/// Generates code for the given assembly file.
/// </summary>
/// <param name="reader">A StreamReader instance that will read the input assembly file.</param>
/// <param name="objFile">The basic object file that will be written to.</param>
public void GenerateCode(string fileName, StreamReader reader, BasicObjectFile objFile)
{
SegmentType currSegmentType = SegmentType.Invalid;
int currAlignment = CommonConstants.DEFAULT_ALIGNMENT;
// a list of all exceptions we encounter during parsing.
// users can view them all at once instead of working through them piecemeal.
var exceptionList = new List <AssemblyException>();
int lineNum = 0;
while (!reader.EndOfStream)
{
try
{
++lineNum;
// trim the whitespace from any read-in line.
string line = reader.ReadLine().Trim();
// get a substring up until the commented line, ignoring those in user quotes.
line = ParserCommon.GetSanitizedString(line);
// ignore blank lines. trim should remove all whitespace
if (line.Any())
{
LineParseResults directiveResults = ParserCommon.HandleAssemblerDirective(line, lineNum, currSegmentType, currAlignment);
// if we have a new data alignment, we need to record this in case the disassembler
// parses this file. otherwise, it will interpret padding bytes as actual data elements.
if (currAlignment != directiveResults.NewAlignment)
{
objFile.AddAlignmentChangeDeclaration(directiveResults.NewAlignment);
}
currAlignment = directiveResults.NewAlignment;
currSegmentType = directiveResults.NewSegment;
// if our segment type is valid, then we're processing actual data versus an assembler directive.
if (!directiveResults.IsLineAssemblerDirective &&
currSegmentType != SegmentType.Invalid)
{
if (!TryHandlingLinkageDeclaration(line, lineNum, objFile))
{
ISegmentCodeGenerator codeGen = m_CodeGenFac.GetCodeGeneratorForSegment(currSegmentType);
var asmLine = new LineData(line, lineNum);
try
{
codeGen.GenerateCodeForSegment(fileName, asmLine, objFile, currAlignment);
}
catch (AssemblyException)
{
throw;
}
catch (Exception ex)
{
throw new AssemblyException(lineNum, ex.Message);
}
}
}
}
}
catch (AssemblyException ex)
{
exceptionList.Add(ex);
}
}
// if any exceptions were encountered, throw an aggregate exception with
// all of the encountered exceptions.
if (exceptionList.Any())
{
throw new AggregateAssemblyError(exceptionList);
}
// reset the StreamReader to the beginning position.
reader.Seek(0, SeekOrigin.Begin);
}