/**
* Scan the symbol table for ENTRY symbols and create linking records
* for them.
*
* @refcode OB
* @errtest
* N/A
* @errmsg
* N/A
* @author Jacob Peddicord
* @creation May 11, 2011
* @modlog
* @teststandard Andrew Buelow
* @codestandard Mark Mathis
*/
private void GenerateLinkingRecords()
{
// iterate the symbol table
foreach (string symbName in this.symb.SortedSymbols())
{
// we only care about ENTRY symbols
Symbol symb = this.symb.GetSymbol(symbName);
if (symb.usage == Usage.ENTRY)
{
if (symb.lc != null)
{
// generate a linking record
var record = new LinkingRecord(this.symb.ProgramName);
record.EntryName = symb.rlabel;
record.ProgramLocation = symb.lc;
this.AddRecord(record);
}
// unused ENTRY directive
else
{
foreach (IntermediateLine line in this.input)
{
if (line.Directive == "ENTRY" && line.DirectiveOperand == symb.rlabel)
{
line.AddError(Errors.Category.Serious, 36);
}
}
}
}
}
}
/**
* Scan and the source (pass 2) and generate text and modification
* records as apporpriate.
*
* @refcode OB
* @errtest
* N/A
* @errmsg
* N/A
* @author Jacob Peddicord
* @creation May 9, 2011
* @modlog
* - May 10, 2011 - Jacob - Implemented some modification record things
* - May 10, 2011 - Jacob - Refactored line iteration a bit
* - May 11, 2011 - Jacob - Fix how we determine the type and number of modifications
* - May 13, 2011 - Mark - Implement expression processing
* - May 13, 2011 - Mark - Fix one of the expression cases with modifications
* - May 14, 2011 - Mark - Implement ADC/e!
* - May 14, 2011 - Mark - Adjust error handling code
* @teststandard Andrew Buelow
* @codestandard Mark Mathis
*/
private void GenerateSourceRecords()
{
foreach (IntermediateLine line in this.input)
{
//Console.WriteLine(this.SourceLine)
// skip lines that won't be in the object file
if (line.ProgramCounter == null)
{
// special case: RESET directive should generate a linking record
if (line.Directive == "RESET" && line.GetThreeErrors().Count == 0)
{
var record = new LinkingRecord(this.symb.ProgramName);
record.EntryName = line.Label;
// set the location to the target of the RESET
record.ProgramLocation = line.DirectiveOperand;
this.AddRecord(record);
}
// store the rest in the report
List<Errors.Error> errors = line.GetThreeErrors();
this.report.Add(null, null, ' ',
line.SourceLineNumber, line.SourceLine, errors);
continue;
}
// create the text record
TextRecord rec = new TextRecord(this.symb.ProgramName);
rec.ProgramLocation = line.ProgramCounter;
rec.StatusFlag = 'A';
rec.Adjustments = "0";
string bin = line.Bytecode;
// do we have an instruction?
if (line.OpCategory != null)
{
// equated symbols may need to be relocated
if (line.Equated != null)
{
Symbol symb = this.symb.GetSymbol(line.Equated);
if (symb.relocations == 0)
{
rec.StatusFlag = 'A';
rec.Adjustments = "0";
}
else if (symb.relocations == 1)
{
rec.StatusFlag = 'R';
rec.Adjustments = "0";
}
else
{
ModificationRecord mod = new ModificationRecord(this.symb.ProgramName);
mod.ProgramLocation = line.ProgramCounter;
mod.Word = Convert.ToString(Convert.ToInt32(line.Bytecode, 2), 16);
for (int i = 0; i < symb.relocations; i++)
{
mod.AddAdjustment(true, this.symb.ProgramName);
}
this.AddRecord(mod);
rec.StatusFlag = 'M';
rec.Adjustments = Convert.ToString(symb.relocations, 16);
}
}
// or a plain label
else if (line.OpLitOperand == OperandParser.Literal.NONE)
{
// get the symbol that is being referenced
if (line.OpOperand != null && this.symb.ContainsSymbol(line.OpOperand))
{
Symbol symb = this.symb.GetSymbol(line.OpOperand);
// external labels are processed in the linker
if (symb.usage == Usage.EXTERNAL) {
// create a modification record
ModificationRecord mod = new ModificationRecord(this.symb.ProgramName);
mod.ProgramLocation = line.ProgramCounter;
mod.Word = Convert.ToString(Convert.ToInt32(line.Bytecode, 2), 16);
mod.AddAdjustment(true, symb.rlabel);
this.AddRecord(mod);
// set the status to 1 modify
rec.StatusFlag = 'M';
rec.Adjustments = "1";
}
// otherwise we can resolve the symbol
else
{
// get the binary encoding padded to 10 bits
bin = BinaryHelper.BinaryString(symb.lc).PadLeft(10, '0');
// prefix it with the original instruction bytecode
bin = line.Bytecode.Substring(0, 6) + bin;
// relocatable label
rec.StatusFlag = 'R';
}
}
// was it empty?
else if (line.OpOperand == null || line.OpOperand.Length == 0)
{
bin = line.Bytecode;
rec.StatusFlag = 'A';
}
// error, otherwise
else
{
line.AddError(Errors.Category.Serious, 34);
line.NOPificate();
bin = line.Bytecode;
}
}
// otherwise if it is (was) an expression
else if (line.OpLitOperand == OperandParser.Literal.EXPRESSION)
{
// then is is relocatable
// get the expression to be evaluated
string expr = line.OpOperand;
// create the modification record, this will have at least one
// adjustment because these expressions are required to have a *
ModificationRecord mod = new ModificationRecord(symb.ProgramName);
// this is a garbage variable
int rel;
// evaluate the expression
bool worked;
worked = OperandParser.ParseExpression(ref expr, OperandParser.Expressions.Operand,
line, ref symb, mod, out rel);
if (worked)
{
// adjustments and such
rec.StatusFlag = 'M';
rec.Adjustments = Convert.ToString(mod.Adjustments, 16);
// get the hex sorted out
int adj = Convert.ToInt32(expr, 16);
int bytecode = Convert.ToInt32(bin, 2) + adj;
// check the range
int start = Convert.ToInt32(this.input.Line(1).DirectiveOperand, 16);
int eof = start + Convert.ToInt32(this.input.ModuleLength, 16);
if (Convert.ToInt32(expr, 16) > eof || Convert.ToInt32(expr, 16) < start)
{
line.AddError(Errors.Category.Serious, 38);
line.NOPificate();
}
else
{
bin = Convert.ToString(bytecode, 2);
mod.Word = Convert.ToString(bytecode, 16);
mod.ProgramLocation = line.ProgramCounter;
this.AddRecord(mod);
}
}
else
{
}
}
// special case: numeric values with GOTO, JUMP, MOPER
else if (line.OpLitOperand == OperandParser.Literal.NUMBER &&
(line.OpFunction == "GOTO" ||
line.OpCategory == "JUMP" ||
line.OpCategory == "MOPER"))
{
rec.StatusFlag = 'R';
}
// otherwise, it was a literal
else
{
rec.StatusFlag = 'A';
}
}
// or a DAT directive?
else if (line.Directive == "DAT")
{
// DAT fields shouldn't need to be modified
rec.StatusFlag = 'A';
}
// or an ADC directive?
else if (line.Directive == "ADC" || line.Directive == "ADCE")
{
// make the modification record
ModificationRecord mod = new ModificationRecord(symb.ProgramName);
bool worked = true;
string expr = line.DirectiveOperand;
int rel = 0;
int maxOp = 1;
// this differentiates between ADC and ADCe
if (line.Directive.EndsWith("E"))
{
maxOp = 3;
}
if (line.DirectiveLitOperand == OperandParser.Literal.EXPRESSION)
{
// wat do if expressions
worked = OperandParser.ParseExpression(ref expr, OperandParser.Expressions.ADC, line,
ref symb, mod, out rel, maxOp);
// catching errors
if (worked)
{
bin = Convert.ToString(Convert.ToInt32(expr, 16), 2);
}
}
else if (line.DirectiveLitOperand == OperandParser.Literal.NUMBER)
{
// wat do if just a number
mod.AddAdjustment(true, symb.ProgramName);
rel = 1;
bin = Convert.ToString(Convert.ToInt32(expr, 16), 2);
}
// check the range
int start = Convert.ToInt32(this.input.Line(1).DirectiveOperand, 16);
int eof = start + Convert.ToInt32(this.input.ModuleLength, 16);
if (Convert.ToInt32(expr, 16) > eof || Convert.ToInt32(expr, 16) < start)
{
line.AddError(Errors.Category.Serious, 38);
line.NOPificate();
bin = "0000000000000000";
}
// if there are modifications to be made, add them
if (mod.Adjustments > 0 && rel > 0 && worked)
{
rec.StatusFlag = 'M';
rec.Adjustments = Convert.ToString(mod.Adjustments, 16);
mod.Word = Convert.ToString(Convert.ToInt32(bin, 2), 16);
mod.ProgramLocation = line.ProgramCounter;
this.AddRecord(mod);
}
}
// anything else with a LC shouldn't be here...
else
{
// this code *should* be unreachable
throw new NotImplementedException();
}
// convert bytecode to hex and add the record
rec.HexCode = Convert.ToString(Convert.ToInt32(bin, 2), 16).ToUpper();
this.AddRecord(rec);
// list of errors
List<Errors.Error> errorlist = line.GetThreeErrors();
// add a line to the assembly report
this.report.Add(line.ProgramCounter, rec.HexCode, rec.StatusFlag,
line.SourceLineNumber, line.SourceLine, errorlist);
}
}
/**
* Add a linking record to this object file.
*
* @param record The linking record to add
* @refcode OB
* @errtest
* N/A
* @errmsg
* N/A
* @author Jacob Peddicord
* @creation May 10, 2011
* @modlog
* @teststandard Andrew Buelow
* @codestandard Mark Mathis
*/
private void AddRecord(LinkingRecord record)
{
this.linkingRecords.Add(record);
}
