Microsoft.Scripting.Runtime.DynamicOperations.EmitInvoker C# (CSharp) Method

        private Func<DynamicOperations, CallSiteBinder, object, object[], object> EmitInvoker(int paramCount) {
            ParameterExpression dynOps = Expression.Parameter(typeof(DynamicOperations));
            ParameterExpression callInfo = Expression.Parameter(typeof(CallSiteBinder));
            ParameterExpression target = Expression.Parameter(typeof(object));
            ParameterExpression args = Expression.Parameter(typeof(object[]));
            Type funcType = DelegateUtils.EmitCallSiteDelegateType(paramCount);
            ParameterExpression site = Expression.Parameter(typeof(CallSite<>).MakeGenericType(funcType));
            Expression[] siteArgs = new Expression[paramCount + 2];
            siteArgs[0] = site;
            siteArgs[1] = target;
            for (int i = 0; i < paramCount; i++) {
                siteArgs[i + 2] = Expression.ArrayIndex(args, Expression.Constant(i));
            }

            var getOrCreateSiteFunc = new Func<CallSiteBinder, CallSite<Func<object>>>(GetOrCreateSite<Func<object>>).Method.GetGenericMethodDefinition();
            return Expression.Lambda<Func<DynamicOperations, CallSiteBinder, object, object[], object>>(
                Expression.Block(
                    new[] { site },
                    Expression.Assign(
                        site,
                        Expression.Call(dynOps, getOrCreateSiteFunc.MakeGenericMethod(funcType), callInfo)
                    ),
                    Expression.Invoke(
                        Expression.Field(
                            site,
                            site.Type.GetField("Target")
                        ),
                        siteArgs
                    )
                ),
                new[] { dynOps, callInfo, target, args }
            ).Compile();
        }