private void EvaluateAsmCmp(BinaryASMInstruction cmp)
{
long?source = null;
long?destination = null;
var sourceState = EvaluateSource(cmp.Source);
if (cmp.Desination is IdentifierExpression identifierDest)
{
var destState = registers[identifierDest.Identifier];
source = long.Parse(sourceState.Value);
destination = long.Parse(destState.Value);
}
else if (cmp.Desination is IndexingExpression indexingDest)
{
//
// Evaluate.
//
context.IsAssemblyContext = true;
var destState = VisitAssemblyInstruction(indexingDest.Expression);
context.IsAssemblyContext = false;
//
// Get the value from the heap.
//
var offset = (int)long.Parse(destState.Value);
source = long.Parse(sourceState.Value);
destination = heap.Read(offset);
}
var result = destination - source;
flags["SF"] = 0;
flags["ZF"] = 0;
flags["CF"] = 0;
if (result <= -1)
{
flags["SF"] = 1;
}
if (result == 0)
{
flags["ZF"] = 1;
}
if (source > destination)
{
flags["CF"] = 1;
}
}
private void EvaluateAsmShl(BinaryASMInstruction shl)
{
var sourceState = EvaluateSource(shl.Source);
if (shl.Desination is IdentifierExpression identifierDest)
{
var destState = registers[identifierDest.Identifier];
var result = (int.Parse(sourceState.Value) << int.Parse(destState.Value));
destState.Value = result.ToString();
registers[identifierDest.Identifier] = destState;
if (context.IsExplain)
{
printer.Print(new Run()
{
Text = identifierDest.Identifier, Color = Colors.White
});
PrintAsBitSet((int)long.Parse(destState.Value));
}
}
else if (shl.Desination is IndexingExpression indexingDest)
{
//
// Evaluate.
//
context.IsAssemblyContext = true;
var destState = VisitAssemblyInstruction(indexingDest.Expression);
context.IsAssemblyContext = false;
//
// Get the value from the heap.
//
var offset = (int)long.Parse(destState.Value);
var sourceValue = (int)long.Parse(sourceState.Value);
var destValue = heap.Read(offset);
var result = (sourceValue << destValue);
heap.Write(result, offset);
if (context.IsExplain)
{
printer.Print(new Run()
{
Text = $"[{offset}] : {result}", Color = Colors.White
});
PrintAsBitSet(result);
}
}
}
