System.Reflection.Emit.DynamicResolver.ParentToken C# (CSharp) Method

        internal override unsafe int ParentToken(int token)
        {
            RuntimeTypeHandle owner = RuntimeTypeHandle.EmptyHandle;
            
            Object handle = m_scope[token];

            if (handle is RuntimeMethodHandle) 
            {
                RuntimeMethodHandle method = (RuntimeMethodHandle)handle;
                owner = method.GetDeclaringType();
            }
            else if (handle is RuntimeFieldHandle) 
            {
                RuntimeFieldHandle field = (RuntimeFieldHandle)handle;
                owner = field.GetApproxDeclaringType();
            }
            else if (handle is DynamicMethod) 
            {
                DynamicMethod dynMeth = (DynamicMethod)handle;
                owner = dynMeth.m_method.GetDeclaringType();
            }
            else if (handle is GenericMethodInfo) 
            {
                GenericMethodInfo gmi = (GenericMethodInfo)handle;
                owner = gmi.m_context;
            }
            else if (handle is VarArgMethod) 
            {
                VarArgMethod varargMeth = (VarArgMethod)handle;
                if (varargMeth.m_method is DynamicMethod)
                    owner = ((DynamicMethod)varargMeth.m_method).m_method.GetDeclaringType();
                else if (varargMeth.m_method is DynamicMethod.RTDynamicMethod) 
                    owner = ((DynamicMethod.RTDynamicMethod)varargMeth.m_method).m_owner.m_method.GetDeclaringType();
                else
                    owner = varargMeth.m_method.MethodHandle.GetDeclaringType();
            }

            if (owner.IsNullHandle()) 
                return -1;

            return m_scope.GetTokenFor(owner);
        }