content: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import java.io.File;
  import java.io.IOException;
  import java.lang.reflect.Method;
  import java.util.Arrays;
  import java.util.ArrayList;
  import java.util.Map;
  
  public class Main {
      private static final String TEMP_FILE_NAME_PREFIX = "test";
      private static final String TEMP_FILE_NAME_SUFFIX = ".trace";
  
      public static void main(String[] args) throws Exception {
          String name = System.getProperty("java.vm.name");
          if (!"Dalvik".equals(name)) {
              System.out.println("This test is not supported on " + name);
              return;
          }
          testMethodTracing();
          testCountInstances();
          testRuntimeStat();
          testRuntimeStats();
      }
  
      private static File createTempFile() throws Exception {
          try {
              return  File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
          } catch (IOException e) {
              System.setProperty("java.io.tmpdir", "/data/local/tmp");
              try {
                  return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
              } catch (IOException e2) {
                  System.setProperty("java.io.tmpdir", "/sdcard");
                  return File.createTempFile(TEMP_FILE_NAME_PREFIX, TEMP_FILE_NAME_SUFFIX);
              }
          }
      }
  
      private static void testMethodTracing() throws Exception {
          File tempFile = null;
          try {
              tempFile = createTempFile();
              testMethodTracingToFile(tempFile);
          } finally {
              if (tempFile != null) {
                  tempFile.delete();
              }
          }
      }
  
      private static void testMethodTracingToFile(File tempFile) throws Exception {
          String tempFileName = tempFile.getPath();
  
          if (VMDebug.getMethodTracingMode() != 0) {
              VMDebug.stopMethodTracing();
          }
  
          System.out.println("Confirm enable/disable");
          System.out.println("status=" + VMDebug.getMethodTracingMode());
          VMDebug.startMethodTracing(tempFileName, 0, 0, false, 0);
          System.out.println("status=" + VMDebug.getMethodTracingMode());
          VMDebug.stopMethodTracing();
          System.out.println("status=" + VMDebug.getMethodTracingMode());
          if (tempFile.length() == 0) {
              System.out.println("ERROR: tracing output file is empty");
          }
  
          System.out.println("Confirm sampling");
          VMDebug.startMethodTracing(tempFileName, 0, 0, true, 1000);
          System.out.println("status=" + VMDebug.getMethodTracingMode());
          VMDebug.stopMethodTracing();
          System.out.println("status=" + VMDebug.getMethodTracingMode());
          if (tempFile.length() == 0) {
              System.out.println("ERROR: sample tracing output file is empty");
          }
  
          System.out.println("Test starting when already started");
          VMDebug.startMethodTracing(tempFileName, 0, 0, false, 0);
          System.out.println("status=" + VMDebug.getMethodTracingMode());
          VMDebug.startMethodTracing(tempFileName, 0, 0, false, 0);
          System.out.println("status=" + VMDebug.getMethodTracingMode());
  
          System.out.println("Test stopping when already stopped");
          VMDebug.stopMethodTracing();
          System.out.println("status=" + VMDebug.getMethodTracingMode());
          VMDebug.stopMethodTracing();
          System.out.println("status=" + VMDebug.getMethodTracingMode());
  
          System.out.println("Test tracing with empty filename");
          try {
              VMDebug.startMethodTracing("", 0, 0, false, 0);
              System.out.println("Should have thrown an exception");
          } catch (Exception e) {
              System.out.println("Got expected exception");
          }
  
          System.out.println("Test tracing with bogus (< 1024 && != 0) filesize");
          try {
              VMDebug.startMethodTracing(tempFileName, 1000, 0, false, 0);
              System.out.println("Should have thrown an exception");
          } catch (Exception e) {
              System.out.println("Got expected exception");
          }
  
          System.out.println("Test sampling with bogus (<= 0) interval");
          try {
              VMDebug.startMethodTracing(tempFileName, 0, 0, true, 0);
              System.out.println("Should have thrown an exception");
          } catch (Exception e) {
              System.out.println("Got expected exception");
          }
  
          tempFile.delete();
      }
  
      private static void checkNumber(String s) throws Exception {
          if (s == null) {
              System.out.println("Got null string");
              return;
          }
          long n = Long.valueOf(s);
          if (n < 0) {
              System.out.println("Got negative number " + n);
          }
      }
  
      private static void checkHistogram(String s) throws Exception {
          if (s == null || s.length() == 0) {
              System.out.println("Got null or empty string");
              return;
          }
          String[] buckets = s.split(",");
          long last_key = 0;
          for (int i = 0; i < buckets.length; ++i) {
              String bucket = buckets[i];
              if (bucket.length() == 0) {
                  System.out.println("Got empty bucket");
                  continue;
              }
              String[] kv = bucket.split(":");
              if (kv.length != 2 || kv[0].length() == 0 || kv[1].length() == 0) {
                  System.out.println("Got bad bucket " + bucket);
                  continue;
              }
              long key = Long.valueOf(kv[0]);
              long value = Long.valueOf(kv[1]);
              if (key < 0 || value < 0) {
                  System.out.println("Got negative key or value " + bucket);
                  continue;
              }
              if (key < last_key) {
                  System.out.println("Got decreasing key " + bucket);
                  continue;
              }
              last_key = key;
          }
      }
  
      private static void testRuntimeStat() throws Exception {
          // Invoke at least one GC and wait for 20 seconds or so so we get at
          // least one bucket in the histograms.
          for (int i = 0; i < 20; ++i) {
            Runtime.getRuntime().gc();
            Thread.sleep(1000L);
          }
          String gc_count = VMDebug.getRuntimeStat("art.gc.gc-count");
          String gc_time = VMDebug.getRuntimeStat("art.gc.gc-time");
          String bytes_allocated = VMDebug.getRuntimeStat("art.gc.bytes-allocated");
          String bytes_freed = VMDebug.getRuntimeStat("art.gc.bytes-freed");
          String blocking_gc_count = VMDebug.getRuntimeStat("art.gc.blocking-gc-count");
          String blocking_gc_time = VMDebug.getRuntimeStat("art.gc.blocking-gc-time");
          String gc_count_rate_histogram = VMDebug.getRuntimeStat("art.gc.gc-count-rate-histogram");
          String blocking_gc_count_rate_histogram =
              VMDebug.getRuntimeStat("art.gc.blocking-gc-count-rate-histogram");
          checkNumber(gc_count);
          checkNumber(gc_time);
          checkNumber(bytes_allocated);
          checkNumber(bytes_freed);
          checkNumber(blocking_gc_count);
          checkNumber(blocking_gc_time);
          checkHistogram(gc_count_rate_histogram);
          checkHistogram(blocking_gc_count_rate_histogram);
      }
  
      private static void testRuntimeStats() throws Exception {
          // Invoke at least one GC and wait for 20 seconds or so so we get at
          // least one bucket in the histograms.
          for (int i = 0; i < 20; ++i) {
            Runtime.getRuntime().gc();
            Thread.sleep(1000L);
          }
          Map<String, String> map = VMDebug.getRuntimeStats();
          String gc_count = map.get("art.gc.gc-count");
          String gc_time = map.get("art.gc.gc-time");
          String bytes_allocated = map.get("art.gc.bytes-allocated");
          String bytes_freed = map.get("art.gc.bytes-freed");
          String blocking_gc_count = map.get("art.gc.blocking-gc-count");
          String blocking_gc_time = map.get("art.gc.blocking-gc-time");
          String gc_count_rate_histogram = map.get("art.gc.gc-count-rate-histogram");
          String blocking_gc_count_rate_histogram =
              map.get("art.gc.blocking-gc-count-rate-histogram");
          checkNumber(gc_count);
          checkNumber(gc_time);
          checkNumber(bytes_allocated);
          checkNumber(bytes_freed);
          checkNumber(blocking_gc_count);
          checkNumber(blocking_gc_time);
          checkHistogram(gc_count_rate_histogram);
          checkHistogram(blocking_gc_count_rate_histogram);
      }
  
      static class ClassA { }
      static class ClassB { }
      static class ClassC extends ClassA { }
  
      private static void testCountInstances() throws Exception {
          ArrayList<Object> l = new ArrayList<Object>();
          l.add(new ClassA());
          l.add(new ClassB());
          l.add(new ClassA());
          l.add(new ClassC());
          Runtime.getRuntime().gc();
          System.out.println("Instances of ClassA " +
                  VMDebug.countInstancesofClass(ClassA.class, false));
          System.out.println("Instances of ClassB " +
                  VMDebug.countInstancesofClass(ClassB.class, false));
          System.out.println("Instances of null " + VMDebug.countInstancesofClass(null, false));
          System.out.println("Instances of ClassA assignable " +
                  VMDebug.countInstancesofClass(ClassA.class, true));
          Class[] classes = new Class[]{ClassA.class, ClassB.class, null};
          long[] counts = VMDebug.countInstancesofClasses(classes, false);
          System.out.println("Array counts " + Arrays.toString(counts));
          counts = VMDebug.countInstancesofClasses(classes, true);
          System.out.println("Array counts assignable " + Arrays.toString(counts));
      }
  
      private static class VMDebug {
          private static final Method startMethodTracingMethod;
          private static final Method stopMethodTracingMethod;
          private static final Method getMethodTracingModeMethod;
          private static final Method getRuntimeStatMethod;
          private static final Method getRuntimeStatsMethod;
          private static final Method countInstancesOfClassMethod;
          private static final Method countInstancesOfClassesMethod;
          static {
              try {
                  Class c = Class.forName("dalvik.system.VMDebug");
                  startMethodTracingMethod = c.getDeclaredMethod("startMethodTracing", String.class,
                          Integer.TYPE, Integer.TYPE, Boolean.TYPE, Integer.TYPE);
                  stopMethodTracingMethod = c.getDeclaredMethod("stopMethodTracing");
                  getMethodTracingModeMethod = c.getDeclaredMethod("getMethodTracingMode");
                  getRuntimeStatMethod = c.getDeclaredMethod("getRuntimeStat", String.class);
                  getRuntimeStatsMethod = c.getDeclaredMethod("getRuntimeStats");
                  countInstancesOfClassMethod = c.getDeclaredMethod("countInstancesOfClass",
                          Class.class, Boolean.TYPE);
                  countInstancesOfClassesMethod = c.getDeclaredMethod("countInstancesOfClasses",
                          Class[].class, Boolean.TYPE);
              } catch (Exception e) {
                  throw new RuntimeException(e);
              }
          }
  
          public static void startMethodTracing(String filename, int bufferSize, int flags,
                  boolean samplingEnabled, int intervalUs) throws Exception {
              startMethodTracingMethod.invoke(null, filename, bufferSize, flags, samplingEnabled,
                      intervalUs);
          }
          public static void stopMethodTracing() throws Exception {
              stopMethodTracingMethod.invoke(null);
          }
          public static int getMethodTracingMode() throws Exception {
              return (int) getMethodTracingModeMethod.invoke(null);
          }
          public static String getRuntimeStat(String statName) throws Exception {
              return (String) getRuntimeStatMethod.invoke(null, statName);
          }
          public static Map<String, String> getRuntimeStats() throws Exception {
              return (Map<String, String>) getRuntimeStatsMethod.invoke(null);
          }
          public static long countInstancesofClass(Class c, boolean assignable) throws Exception {
              return (long) countInstancesOfClassMethod.invoke(null, new Object[]{c, assignable});
          }
          public static long[] countInstancesofClasses(Class[] classes, boolean assignable)
                  throws Exception {
              return (long[]) countInstancesOfClassesMethod.invoke(
                      null, new Object[]{classes, assignable});
          }
      }
  }
  