public void Add(Macro macro)
{
macros[macro.Name] = macro;
}
public override void EndNode(ParserContext context)
{
expressionResolver.EndNode(context);
switch (context.NodeKind)
{
case SyntaxNodeKind.Label:
labelName = context.Span.Text;
break;
case SyntaxNodeKind.MacroName:
currentMacroName = context.Span.Text;
break;
case SyntaxNodeKind.Macro:
currentMacro = new Macro(currentMacroName);
break;
case SyntaxNodeKind.DirectiveName:
directiveName = context.Span.Text;
if (labelName != null && directiveName != "=")
{
AddLabel(new Label(labelName, currentChunkStartAddress + opcodes.Count));
labelName = null;
}
break;
case SyntaxNodeKind.Directive:
ProcessDriective();
break;
case SyntaxNodeKind.Instruction:
ProcessInstruction();
break;
case SyntaxNodeKind.ImpliedOperand:
operandKind = OperandKind.Implied;
break;
case SyntaxNodeKind.AbsoluteOperand:
ProcessAbsoluteOperand();
break;
case SyntaxNodeKind.ImmediateOperand:
operandValue = (byte) expressionResolver.Evaluate();
operandKind = OperandKind.Immediate;
break;
case SyntaxNodeKind.IndirectOperand:
ProcessIndirectOperand();
break;
case SyntaxNodeKind.OperandIndexer:
ProcessOperandIndexer(context.Span.Text);
break;
case SyntaxNodeKind.Mnemonic:
mnemonic = context.Span.Text;
break;
case SyntaxNodeKind.DirectiveOperands:
directiveOperands.Enqueue(expressionResolver.Evaluate());
break;
case SyntaxNodeKind.Literal:
foreach (var b in AtasciiEncoding.Instance.GetBytes(context.Span.Text))
{
directiveOperands.Enqueue(b);
}
break;
case SyntaxNodeKind.Line:
if (labelName != null)
{
AddLabel(new Label(labelName, currentChunkStartAddress + opcodes.Count));
labelName = null;
}
break;
}
}
public bool TryGetMacro(string name, out Macro macro)
{
return macros.TryGetValue(name, out macro);
}
private void ProcessDriective()
{
switch (directiveName)
{
case ".BYTE":
while (directiveOperands.Count > 0)
{
var directiveOperand = directiveOperands.Dequeue();
AddOpCode((byte) (directiveOperand & 0xFF));
}
break;
case ".WORD":
while (directiveOperands.Count > 0)
{
var directiveOperand = directiveOperands.Dequeue();
AddOpCode((byte)( directiveOperand & 0xFF ));
AddOpCode((byte)( ( directiveOperand & 0xFF00 ) >> 8 ));
}
break;
case ".DBYTE":
while (directiveOperands.Count > 0)
{
var directiveOperand = directiveOperands.Dequeue();
AddOpCode((byte)( ( directiveOperand & 0xFF00 ) >> 8 ));
AddOpCode((byte)( directiveOperand & 0xFF ));
}
break;
case ".IF":
var conditionValue = directiveOperands.Dequeue();
ifConditionValues.Push(conditionValue);
if (conditionValue == 0)
{
skippingIfsCount++;
}
break;
case ".ELSE":
var conditionValue2 = ifConditionValues.Pop();
if (conditionValue2 == 0)
{
ifConditionValues.Push(1);
skippingIfsCount--;
}
else
{
ifConditionValues.Push(0);
skippingIfsCount++;
}
break;
case ".ENDIF":
if (ifConditionValues.Pop() == 0)
skippingIfsCount--;
if (skippingIfsCount < 0)
throw new InvalidOperationException("unpaired .ENDIF");
break;
case ".ENDM":
macroStore.Add(currentMacro);
currentMacro = null;
currentMacroName = null;
break;
case ".DS":
var dsLength = directiveOperands.Dequeue();
SetCurrentOrigin(opcodes.Count + currentChunkStartAddress + dsLength);
break;
case "*=":
SetCurrentOrigin(directiveOperands.Dequeue());
break;
case "=":
AddLabel(new Label(labelName, directiveOperands.Dequeue()));
labelName = null;
break;
}
if (directiveOperands.Count > 0)
{
throw new InvalidOperationException("Unprocessed directive operands");
}
}