In a punch bowl, large glass bowl, or a trifle dish, place 1/2 can of cherry pie filling and spread evenly. Crumble 1/2 of the cooled cake and sprinkle over pie filling. Spoon 1/2 of the pudding over the cake, sprinkle with 1/2 of the drained pineapple, another 1/2 can cherry pie filling, 1 carton whipped topping, and 1/2 cup chopped pecans.