static void GenerateCompareTypeIL(DynamicMethodHelper il, Type t)
{
MethodInfo method = GetTypeMethod(t, TypeMethodType.Compare);
if ((method == null) && (t.IsPrimitive == false))
{
il.Pop();
il.Pop();
il.PushInt(1);
return;
}
il.BeginScope();
{
const string valX = "x";
const string valY = "y";
const string valThis = "_thisX";
const string trueLabel = "endTrue";
const string falseLabel = "endFalse";
const string endLabel = "endCheck";
il.DeclareLocal(valX, typeof(object));
il.PopLocal(valX);
il.DeclareLocal(valY, typeof(object));
il.PopLocal(valY);
// If both null or the same object then return true
il.PushLocal(valX);
il.PushLocal(valY);
il.GotoIfEqual(trueLabel);
// Exit false if either value is null
il.PushLocal(valX);
il.GotoIfFalse(falseLabel);
il.PushLocal(valY);
il.GotoIfFalse(falseLabel);
// Both operands are non-null so call the type-specific comparison method
if (t.IsPrimitive)
{
il.PushLocal(valX);
il.UnboxValueType(t);
il.PushLocal(valX);
il.UnboxValueType(t);
il.CompareEqual();
}
else
{
Type paramType = method.GetParameters()[0].ParameterType;
il.DebugWriteLine("Calling " + method);
if (method.IsStatic)
{
il.PushLocal(valX);
if (paramType.IsValueType) il.UnboxValueType(paramType);
}
else
{
il.DeclareLocal(valThis, t);
il.PushLocal(valX);
il.PopLocalFromObject(valThis);
il.PushThis(valThis, method);
}
il.PushLocal(valY);
if (paramType.IsValueType) il.UnboxValueType(paramType);
il.CallMethod(method);
}
il.GotoIfFalse(falseLabel);
il.MarkLabel(trueLabel);
il.PushInt(1);
il.Goto(endLabel);
il.MarkLabel(falseLabel);
il.DebugWriteLine("The following values are not equal:");
il.DebugWriteLocal(valX);
il.DebugWriteLocal(valY);
il.PushInt(0);
il.MarkLabel(endLabel);
}
il.EndScope();
}