private static void ConstantHandler(Match lineReg)
{
string label = lineReg.Groups["label"].Value;
string value = lineReg.Groups["value"].Value;
ExprResult res = ResolveExpr(value);
if (res.undefinedSymbs.Count == 0)
{
Symbol symb = new Symbol()
{
Value = res.Result,
Type = res.Type
};
AddSymbol(label, symb);
}
else
{
UnresolvedSymbol unResSymb = new UnresolvedSymbol();
unResSymb.NbrUndefinedSymb = res.undefinedSymbs.Count;
unResSymb.DependingList = new List <string>();
unResSymb.Expr = value;
unResSymb.ExprList = new List <ushort>();
foreach (string symb in res.undefinedSymbs)
{
AddDependingSymb(symb, label);
}
AddUnsolvedSymbol(label, unResSymb);
}
}
private static void GenerateExprBytes(UnresolvedExpr expr, ExprResult exprRes)
{
byte[] bytes = null;
switch (expr.Type)
{
case SymbolType.WORD:
if (exprRes.Type == SymbolType.BYTE && !CPUDef.isAbsoluteAddr(expr.addrMode) && (expr.addrMode != CPUDef.AddrModes.IND))
{
bytes = new byte[1] {
(byte)exprRes.Result
};
}
else
{
if (expr.addrMode == CPUDef.AddrModes.REL)
{
int delta = (ushort)exprRes.Result - (expr.Position + originAddr);
byte res;
if (delta > 127 || delta < -128)
{
AddError(Errors.REL_JUMP);
}
else
{
if (delta < 0)
{
res = (byte)(255 + delta);
}
else
{
res = (byte)(delta - 1);
}
bytes = new byte[1] {
res
};
}
}
else
{
bytes = GetWordBytes((ushort)exprRes.Result);
}
}
break;
case SymbolType.BYTE:
bytes = new byte[1] {
(byte)exprRes.Result
};
break;
}
if (bytes != null)
{
fileOutMemory.RemoveRange(expr.Position, bytes.Length);
fileOutMemory.InsertRange(expr.Position, bytes);
}
}
private static void DataByteHandler(string bytesIn)
{
string[] bytes = bytesIn.Split(',');
foreach (string db in bytes)
{
string data = db.Trim();
if (CPUDef.isString(data)) // handle strings
{
data = data.Substring(1, data.Length - 2);
foreach (char c in data)
{
fileOutMemory.Add(Convert.ToByte(c));
currentAddr++;
}
}
else
{
ExprResult res = ResolveExpr(data);
if (res.undefinedSymbs.Count == 0)
{
fileOutMemory.Add((byte)res.Result);
}
else
{
fileOutMemory.Add(0);
ushort position = (ushort)(currentAddr - originAddr);
UnresolvedExpr expr = new UnresolvedExpr
{
Position = position,
Type = SymbolType.BYTE,
addrMode = CPUDef.AddrModes.NO,
NbrUndefinedSymb = res.undefinedSymbs.Count,
Expr = data
};
unsolvedExprList.Add(position, expr);
foreach (string symb in res.undefinedSymbs)
{
UnresolvedSymbol unResSymb = new UnresolvedSymbol();
unResSymb.DependingList = new List <string>();
unResSymb.ExprList = new List <ushort>();
unResSymb.ExprList.Add(position);
AddUnsolvedSymbol(symb, unResSymb);
}
}
currentAddr++;
}
}
}
private static void IfHandler(string value)
{
if (cAsm.inCondition)
{
AddError(Errors.NESTED_CONDITIONAL_ASSEMBLY);
return;
}
ExprResult res = ResolveExpr(value.Trim(), CPUDef.AddrModes.NO, true);
if (res.undefinedSymbs.Count > 0)
{
AddError(Errors.UNDEFINED_SYMBOL);
}
else
{
cAsm.inCondition = true;
cAsm.val = (bool)res.Result;
}
}
private static void MemResHandler(Match lineReg)
{
string label = lineReg.Groups["label"].Value;
string value = lineReg.Groups["value"].Value;
ExprResult res = ResolveExpr(value);
if (res.undefinedSymbs.Count == 0)
{
MemArea ma;
Dictionary <string, Symbol> symbTable;
if (localScope.isLocalScope)
{
ma = localScope.memArea;
symbTable = localScope.symbolTable;
}
else
{
ma = memArea;
symbTable = symbolTable;
}
Symbol variable = new Symbol()
{
Type = ma.type, Value = ma.val
};
if (!symbTable.ContainsKey(label))
{
AddSymbol(label, variable);
ma.val += res.Result;
ma.type = ma.val <= 255 ? SymbolType.BYTE : SymbolType.WORD;
MainConsole.WriteLine($"{label} {variable.Value.ToString("x")}");
}
else
{
AddError(Errors.LABEL_EXISTS);
}
}
else
{
AddError(Errors.UNDEFINED_SYMBOL);
}
}
private static void ResolveSymbolDepsAndExprs(UnresolvedSymbol unresSymb)
{
Dictionary <string, UnresolvedSymbol> unsolvedSymbs;
if (localScope.isLocalScope)
{
unsolvedSymbs = localScope.unsolvedSymbols;
}
else
{
unsolvedSymbs = unsolvedSymbols;
}
// resolve depending symbols
foreach (string dep in unresSymb.DependingList)
{
UnresolvedSymbol unresDep = unsolvedSymbs[dep];
unresDep.NbrUndefinedSymb--;
if (unresDep.NbrUndefinedSymb <= 0)
{
ExprResult res = ResolveExpr(unresDep.Expr);
AddSymbol(dep, new Symbol()
{
Value = res.Result,
Type = res.Type
});
}
}
// resolve expressions
foreach (ushort expr in unresSymb.ExprList)
{
UnresolvedExpr unresExp = unsolvedExprList[expr];
unresExp.NbrUndefinedSymb--;
if (unresExp.NbrUndefinedSymb <= 0)
{
ExprResult res = ResolveExpr(unresExp.Expr, unresExp.addrMode);
GenerateExprBytes(unresExp, res);
unsolvedExprList.Remove(expr);
}
}
}
private static void DataWordHandler(string wordsIn)
{
string[] words = wordsIn.Split(',');
foreach (string dw in words)
{
string data = dw.Trim();
ExprResult res = ResolveExpr(data);
if (res.undefinedSymbs.Count == 0)
{
fileOutMemory.AddRange(GetWordBytes((ushort)res.Result));
}
else
{
fileOutMemory.AddRange(new byte[2] {
0, 0
});
ushort position = (ushort)(currentAddr - originAddr);
UnresolvedExpr expr = new UnresolvedExpr
{
Position = position,
Type = SymbolType.WORD,
addrMode = CPUDef.AddrModes.NO,
NbrUndefinedSymb = res.undefinedSymbs.Count,
Expr = data
};
unsolvedExprList.Add(position, expr);
foreach (string symb in res.undefinedSymbs)
{
UnresolvedSymbol unResSymb = new UnresolvedSymbol();
unResSymb.DependingList = new List <string>();
unResSymb.ExprList = new List <ushort>();
unResSymb.ExprList.Add(position);
AddUnsolvedSymbol(symb, unResSymb);
}
}
currentAddr += 2;
}
}
private static void MemAreaHandler(string value)
{
MemArea ma;
if (!localScope.isLocalScope)
{
ma = memArea;
}
else
{
ma = localScope.memArea;
}
ExprResult res = ResolveExpr(value);
if (res.undefinedSymbs.Count == 0)
{
ma.val = res.Result;
ma.type = res.Type;
}
else
{
AddError(Errors.UNDEFINED_SYMBOL);
}
}
private static void InstructionHandler(Match lineReg)
{
string opcode = lineReg.Groups["opcode"].Value;
string operands = lineReg.Groups["operands"].Value;
if (macros.ContainsKey(opcode))
{
Match macroReg = Regex.Match($"{opcode} {operands}", CPUDef.macroReg);
CallMacroHandler(macroReg);
return;
}
string label = lineReg.Groups["label"].Value;
ushort opcodeAddr = currentAddr;
opcode = lineReg.Groups["opcode"].Value.ToUpper();
if (!string.IsNullOrWhiteSpace(label))
{
Symbol lSymb = new Symbol {
Type = SymbolType.WORD, Value = currentAddr
};
AddSymbol(label, lSymb);
}
Byte[] addrModesValues = CPUDef.OPC_TABLE[opcode];
CPUDef.AddrModes addrMode = CPUDef.AddrModes.NO;
List <byte> instBytes = new List <byte>();
CPUDef.InstructionInfo instInfo = new CPUDef.InstructionInfo();
bool syntaxError = true;
if (string.IsNullOrWhiteSpace(operands))
{
syntaxError = false;
// 1 byte opcode
if (Array.Exists(CPUDef.ACC_OPC, opc => opc.Equals(opcode)))
{
addrMode = CPUDef.AddrModes.ACC;
}
else
{
addrMode = CPUDef.AddrModes.IMP;
}
instInfo = new CPUDef.InstructionInfo {
addrMode = addrMode, nbrBytes = 1
};
instBytes.Add(addrModesValues[(int)addrMode]);
}
else
{
string expr = string.Empty;
// 2 bytes opcode
if (Array.Exists(CPUDef.REL_OPC, opc => opc.Equals(opcode)))
{
syntaxError = false;
expr = operands;
instInfo = new CPUDef.InstructionInfo {
addrMode = CPUDef.AddrModes.REL, nbrBytes = 2
};
}
else
{
instInfo = CPUDef.GetInstructionInfo(operands);
syntaxError = false;
expr = instInfo.expr;
}
if (syntaxError)
{
AddError(Errors.OPERANDS);
}
else
{
addrMode = instInfo.addrMode;
ExprResult exprRes = ResolveExpr(expr, addrMode);
if (exprRes.undefinedSymbs.Count == 0)
{
// convert to zero page if symbol is a single byte
if (CPUDef.isAbsoluteAddr(addrMode) && exprRes.Type == SymbolType.BYTE)
{
addrMode = addrMode + 3;
instInfo.nbrBytes = 2;
}
instBytes.Add(addrModesValues[(int)addrMode]);
if (instInfo.nbrBytes == 2)
{
instBytes.Add((byte)exprRes.Result);
}
else
{
instBytes.AddRange(GetWordBytes((ushort)exprRes.Result));
}
}
else
{
instBytes.Add(addrModesValues[(int)addrMode]);
SymbolType typeExpr;
if (instInfo.nbrBytes == 2)
{
instBytes.AddRange(new byte[1] {
0
});
typeExpr = SymbolType.BYTE;
}
else // 3 bytes instr
{
instBytes.AddRange(new byte[2] {
0, 0
});
typeExpr = SymbolType.WORD;
}
ushort position = (ushort)(opcodeAddr - originAddr + 1);
UnresolvedExpr exprObj = new UnresolvedExpr
{
Position = position,
Type = typeExpr,
addrMode = addrMode,
NbrUndefinedSymb = exprRes.undefinedSymbs.Count,
Expr = expr
};
unsolvedExprList.Add(position, exprObj);
foreach (string symb in exprRes.undefinedSymbs)
{
UnresolvedSymbol unResSymb = new UnresolvedSymbol();
unResSymb.DependingList = new List <string>();
unResSymb.ExprList = new List <ushort>();
unResSymb.ExprList.Add(position);
AddUnsolvedSymbol(symb, unResSymb);
}
}
}
}
if (!syntaxError)
{
currentAddr += instInfo.nbrBytes;
fileOutMemory.AddRange(instBytes.ToArray());
MainConsole.WriteLine($"{opcode} mode {addrMode.ToString()}");
}
}
private static ExprResult ResolveExpr(string exprIn, CPUDef.AddrModes addrMode = CPUDef.AddrModes.NO, bool isLogical = false)
{
List <Token> tokens = Tokenizer.Tokenize(exprIn);
string expr = string.Empty;
Symbol symb;
ExprResult exprRes = new ExprResult();
exprRes.undefinedSymbs = new List <string>();
foreach (Token token in tokens)
{
switch (token.Type)
{
case "HB":
expr = $"{expr} {Byte.Parse(token.Value, NumberStyles.HexNumber)}";
break;
case "HW":
expr = $"{expr} {ushort.Parse(token.Value, NumberStyles.HexNumber)}";
break;
case "binByte":
expr = $"{expr} {Convert.ToByte(token.Value, 2)}";
break;
case "DEC":
int val = int.Parse(token.Value);
if (val <= 255)
{
expr = $"{expr} {(byte)val}";
}
else
{
expr = $"{expr} {(ushort)val}";
}
break;
case "label":
symb = GetSymbolValue(token.Value);
if (symb != null)
{
expr = $"{expr} {symb.Value}";
}
else
{
exprRes.undefinedSymbs.Add(token.Value);
}
break;
case "loLabel":
symb = GetSymbolValue(token.Value);
if (symb != null)
{
expr = $"{expr} {GetLowByte((ushort)symb.Value)}";
}
else
{
exprRes.undefinedSymbs.Add(token.Value);
}
break;
case "hiLabel":
symb = GetSymbolValue(token.Value);
if (symb != null)
{
expr = $"{expr} {GetHighByte((ushort)symb.Value)}";
}
else
{
exprRes.undefinedSymbs.Add(token.Value);
}
break;
case "loHW":
expr = $"{expr} {GetLowByte(ushort.Parse(token.Value, NumberStyles.HexNumber))}";
break;
case "hiHW":
expr = $"{expr} {GetHighByte(ushort.Parse(token.Value, NumberStyles.HexNumber))}";
break;
default:
expr = $"{expr} {token.Value}";
break;
}
}
if (exprRes.undefinedSymbs.Count == 0)
{
if (isLogical)
{
exprRes.Result = EvaluateLogicalExpression(expr);
}
else
{
DataTable dt = new DataTable();
exprRes.Result = dt.Compute(expr, "");
exprRes.Type = exprRes.Result <= 255 ? SymbolType.BYTE : SymbolType.WORD;
if (addrMode == CPUDef.AddrModes.REL && exprRes.Type == SymbolType.WORD)
{
int delta = (ushort)exprRes.Result - (currentAddr + 1);
byte res;
if (delta > 127 || delta < -128)
{
AddError(Errors.REL_JUMP);
}
else
{
if (delta < 0)
{
res = (byte)(255 + delta);
}
else
{
res = (byte)(delta - 1);
}
exprRes.Result = res;
exprRes.Type = SymbolType.BYTE;
}
}
}
}
return(exprRes);
}
