/**
* Parses the start directive, properly assigning the operand of start as the
* starting location counter.
*
* @param interLine the intermediate line to process
* @param symb symbol table reference
*
* @refcode D1
* @errtest
* N/A
* @errmsg EF.06
* @author Mark Mathis
* @creation April 9, 2011
* @modlog
* - April 9, 2011 - Mark - Parses the START directive, correctly setting the LC.
* - April 14, 2011 - Mark - Moved into DirectiveParser class.
* - April 17, 2011 - Mark - Catches errors in the start directive.
* - April 19, 2011 - Mark - Reports errors.
* @teststandard Andrew Buelow
* @codestandard Mark Mathis
*/
private static void ParseStart(ref IntermediateLine interLine, ref SymbolTable symb)
{
Logger.Log("Parsing START directive", "DirectiveParser");
// this should only happen if the directive is found on the first line
if (interLine.SourceLineNumber == 1)
{
// expecting operand to be the value of the location counter
// check to see if operand is valid start value
int startLC;
if (interLine.DirectiveLitOperand == OperandParser.Literal.NUMBER)
{
string startOper = BinaryHelper.HexToInt(interLine.DirectiveOperand, 32).ToString();
if (int.TryParse(startOper, out startLC))
{
if (0 <= startLC && startLC <= 1023)
{
Parser.LC = interLine.DirectiveOperand;
}
}
else
{
/*
* The operand could not be parsed as a number.
* This is here as well as below just in case the
* Tokenizer has a hiccough and says that something
* that is not a number is a number.
*/
Logger.Log("ERROR: EF.06 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Fatal, 6);
return;
}
// update the symbol in the symbol table
Symbol start = symb.RemoveSymbol(interLine.Label);
start.usage = Usage.PRGMNAME;
start.lc = null;
symb.AddSymbol(start);
}
else
{
// the operand could not be parsed as a number
Logger.Log("ERROR: EF.06 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Fatal, 6);
return;
}
}
else
{
// not the first line of the source code.
symb.RemoveSymbol(interLine.Label);
Logger.Log("ERROR: ES.35 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Serious, 35);
return;
}
Logger.Log("Finished parsing START directive", "DirectiveParser");
}
/**
* Parses the entry directive, ensuring that the operand is a valid value
* for an equated symbol using extended expressions.
*
* @param interLine the intermediate line to process
* @param symb symbol table reference
*
* @refcode D5
* @errtest
* N/A
* @errmsg EW.05
* @author Mark Mathis
* @creation April 17, 2011
* @modlog
* @teststandard Andrew Buelow
* @codestandard Mark Mathis
*/
private static void ParseEntry(ref IntermediateLine interLine, ref SymbolTable symb)
{
Logger.Log("Parsing ENTRY directive", "DirectiveParser");
// check for a label
if (interLine.Label != null)
{
// entry doesn't expect a label
Logger.Log("ERROR: EW.05 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Warning, 5);
}
if (symb.ContainsSymbol(interLine.DirectiveOperand))
{
if (symb.GetSymbol(interLine.DirectiveOperand).usage != Usage.EQUATED)
{
Symbol tempsym = symb.RemoveSymbol(interLine.DirectiveOperand);
tempsym.usage = Usage.ENTRY;
symb.AddSymbol(tempsym);
}
}
else
{
symb.AddSymbol(interLine.DirectiveOperand, null, Usage.ENTRY);
}
Logger.Log("Finished parsing ENTRY directive", "DirectiveParser");
}
/**
* Parses the equ directive, ensuring that the operand is a valid value for an
* equated symbol.
*
* @param interLine the intermediate line to process
* @param symb symbol table reference
* @param maxOp maximum number of operations to process
*
* @refcode D3
* @errtest
* N/A
* @errmsg ES.21, ES.22, ES.26
* @author Mark Mathis
* @creation April 15, 2011
* @modlog
* @teststandard Andrew Buelow
* @codestandard Mark Mathis
*/
private static void ParseEqu(ref IntermediateLine interLine, ref SymbolTable symb, int maxOp = 1)
{
Logger.Log("Parsing EQU directive", "DirectiveParser");
bool success = true;
if (symb.ContainsSymbol(interLine.Label))
{
Symbol equSym = symb.RemoveSymbol(interLine.Label);
interLine.ProgramCounter = equSym.lc;
if (interLine.DirectiveLitOperand == OperandParser.Literal.NUMBER)
{
// check that number is in bounds
int num = BinaryHelper.HexToInt(interLine.DirectiveOperand, 10);
if (0 <= num && num <= 1023)
{
equSym.usage = Usage.EQUATED;
equSym.val = interLine.DirectiveOperand;
}
else
{
// error: out of bounds
Logger.Log("ERROR: ES.26 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Serious, 26);
success = false;
}
}
else if (symb.ContainsSymbol(interLine.DirectiveOperand) &&
symb.GetSymbol(interLine.DirectiveOperand).usage == Usage.EQUATED)
{
// do stuff with the symbol
equSym.usage = Usage.EQUATED;
equSym.val = symb.GetSymbol(interLine.DirectiveOperand).val;
equSym.relocations = symb.GetSymbol(interLine.DirectiveOperand).relocations;
}
else if (interLine.DirectiveLitOperand == OperandParser.Literal.EXPRESSION)
{
string oper = interLine.DirectiveOperand;
int modifications;
success = OperandParser.ParseExpression(ref oper, OperandParser.Expressions.EQU,
interLine, ref symb, new ModificationRecord("junk"),
out modifications, maxOp);
equSym.usage = Usage.EQUATED;
equSym.val = oper;
equSym.relocations = modifications;
}
else
{
// error: invalid operand for equ
Logger.Log("ERROR: EW.21 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Serious, 21);
success = false;
}
interLine.ProgramCounter = null;
equSym.lc = null;
if (success)
{
// this needs to be checked here in case ParseExpression
// finds an error
int finval = Convert.ToInt32(equSym.val, 16);
if (!(0 <= finval && finval <= 1023))
{
// the final value of the equ is out of bounds
Logger.Log("ERROR: EW.22 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Serious, 22);
success = false;
}
symb.AddSymbol(equSym);
}
}
Logger.Log("Finished parsing EQU directive", "DirectiveParser");
}
/**
* Parses the dat directive, ensuring that the operand has proper syntax
* and is correctly assigned to the current word of memory.
*
* @param interLine the intermediate line to process
* @param symb symbol table reference
*
* @refcode D8
* @errtest
* N/A
* @errmsg ES.14
* @author Mark Mathis
* @creation April 18, 2011
* @modlog
* - April 19, 2011 - Jacob - Fixed padding on values.
* - April 24, 2011 - Mark - Commented out the part that put the value of the dat
* into the symbol table until that can be made clearer
* by Al.
* @teststandard Andrew Buelow
* @codestandard Mark Mathis
*/
private static void ParseDat(ref IntermediateLine interLine, ref SymbolTable symb)
{
Logger.Log("Parsing DAT directive", "DirectiveParser");
if (interLine.DirectiveLitOperand != OperandParser.Literal.NONE &&
interLine.DirectiveLitOperand != OperandParser.Literal.EXPRESSION &&
interLine.DirectiveLitOperand != OperandParser.Literal.NUMBER &&
interLine.DirectiveLitOperand != OperandParser.Literal.UNKNOWN)
{
if (interLine.Label != null)
{
if (!symb.ContainsSymbol(interLine.Label))
{
symb.AddSymbol(interLine.Label, Parser.LC, Usage.LABEL); //,interLine.DirectiveOperand);
}
else
{
Symbol datSym = symb.RemoveSymbol(interLine.Label);
datSym.lc = Parser.LC;
//datSym.val = interLine.DirectiveOperand;
symb.AddSymbol(datSym);
}
}
string val = Convert.ToString(Convert.ToInt32(interLine.DirectiveOperand, 16), 2);
// assumed to be in correct representation; always pad to the left
interLine.Bytecode = val.PadLeft(16, '0');
}
else if (interLine.DirectiveLitOperand == OperandParser.Literal.UNKNOWN)
{
// error: literal operand in improper format
interLine.AddError(Errors.Category.Serious, 37);
}
else
{
// error: invalid operand type
Logger.Log("ERROR: ES.14 encountered", "DirectiveParser");
interLine.AddError(Errors.Category.Serious, 14);
interLine.NOPificate();
}
// this should need to happen no matter what
interLine.ProgramCounter = Parser.LC;
Parser.IncrementLocationCounter();
Logger.Log("Finished parsing DAT directive", "DirectiveParser");
}