source: doc/theses/andrew_beach_MMath/code/FixupEmpty.java @ 5d81edb

public class FixupEmpty {
        public interface Fixup {
                public int op(int fixup);
        }

        static void nounwind_fixup(int frames, Fixup raised_rtn) {
                if (0 < frames) {
                        nounwind_fixup(frames - 1, raised_rtn);
                } else {
                        int fixup = frames;
                        fixup = raised_rtn.op(fixup);
                }
        }

        private static long loop(int times, int total_frames) {
                Fixup raised = (int fixup) -> total_frames + 42; // use local scope => lexical link

                long startTime = System.nanoTime();
                for (int count = 0 ; count < times ; ++count) {
                        nounwind_fixup(total_frames, raised);
                }
                long endTime = System.nanoTime();
                return endTime - startTime;
        }

        public static void main(String[] args) {
                int times = 1;
                int total_frames = 1;
                if (0 < args.length) {
                        times = Integer.parseInt(args[0]);
                }
                if (1 < args.length) {
                        total_frames = Integer.parseInt(args[1]);
                }

                // Warm-Up:
                loop(1000, total_frames);

                long time = loop(times, total_frames);
                System.out.format("Run-Time (s): %.1f%n", time / 1_000_000_000.);
        }
}