private static bool FilterForBox(ParsedMethodBody methodBody)
{
for (int i = 0; i < methodBody.Instructions.Count; ++i)
{
var instruction = methodBody.Instructions[i];
if (instruction.OpCode == OpCodes.Box)
{
if (instruction.Operand.OfType <Type>().Match(t => t.IsGenericParameter, () => false) && i < methodBody.Instructions.Count - 1)
{
var nextOpCode = methodBody.Instructions[i + 1].OpCode;
if (nextOpCode == OpCodes.Brtrue || nextOpCode == OpCodes.Brtrue_S || nextOpCode == OpCodes.Brfalse || nextOpCode == OpCodes.Brfalse_S)
{
continue;
}
if (i >= 2 && nextOpCode == OpCodes.Ceq && methodBody.Instructions[i - 2].OpCode == OpCodes.Ldnull)
{
continue;
}
if (i < methodBody.Instructions.Count - 2 && nextOpCode == OpCodes.Ldnull && methodBody.Instructions[i + 2].OpCode == OpCodes.Ceq)
{
continue;
}
}
return(true);
}
}
return(false);
}
private static bool FilterForNewObject(ParsedMethodBody methodBody)
{
var isAsyncMethod = methodBody.Parent.Value().Match(c => false, m => m.GetCustomAttribute <AsyncStateMachineAttribute>() != null);
foreach (var instruction in methodBody.Instructions.Skip(isAsyncMethod ? 1 : 0).Where(i => i.OpCode == OpCodes.Newobj))
{
if (instruction.Operand.OfType <ConstructorInfo>().Match(constructor => !constructor.ReflectedType.IsValueType && !typeof(Exception).IsAssignableFrom(constructor.ReflectedType), () => false))
{
return(true);
}
}
return(false);
}
