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+/* Simple -- basic ppamltracer example
+ * This file is in the public domain. */
+
+package com.galois.ppaml.tracer.examples;
+
+import com.galois.ppaml.tracer.Phase;
+import com.galois.ppaml.tracer.Tracer;
+
+public class Simple {
+
+ protected Phase factPhase;
+
+ protected Phase fibPhase;
+
+ protected void go(Tracer tracer) {
+ // Register the phases.
+ factPhase = tracer.createPhase("fact");
+ fibPhase = tracer.createPhase("fib");
+
+ // Print factorials.
+ System.out.print("Factorials:");
+ for (int i = 0; i < 21; i++) {
+ System.out.print(" " + fact(i));
+ }
+ System.out.println();
+
+ // Print Fibonacci numbers.
+ System.out.print("Fibonacci numbers:");
+ for (int i = 0; i < 30; i++) {
+ System.out.print(" " + fib(i));
+ }
+ System.out.println();
+
+ // Finalize phases and exit.
+ factPhase.close();
+ fibPhase.close();
+ }
+
+ protected long fact(int n) {
+ // Record that we're running inside the factorial phase.
+ factPhase.start();
+ // Compute the factorial.
+ long result;
+ if (n == 0) {
+ result = 1;
+ } else {
+ result = n * fact(n - 1);
+ }
+ // Return the result.
+ factPhase.stop();
+ return result;
+ }
+
+ protected int fib(int n) {
+ // Record that we're running inside the Fibonacci phase.
+ fibPhase.start();
+ // Compute the nth Fibonacci number.
+ int result;
+ switch (n) {
+ case 0:
+ case 1:
+ result = n;
+ break;
+ default:
+ result = fib(n - 1) + fib(n - 2);
+ break;
+ }
+ // Return the result.
+ fibPhase.stop();
+ return result;
+ }
+
+ public static void main(String[] args) {
+ // Start ppamltracer.
+ Tracer tracer = new Tracer("/tmp/simple_report");
+
+ // Run the app.
+ (new Simple()).go(tracer);
+
+ // Finalize ppamltracer and exit.
+ tracer.close();
+ }
+
+}