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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package art;
     18 
     19 import java.util.ArrayList;
     20 import java.util.Arrays;
     21 
     22 public class Test904 {
     23   public static void run() throws Exception {
     24     // Use a list to ensure objects must be allocated.
     25     ArrayList<Object> l = new ArrayList<>(100);
     26 
     27     prefetchClassNames();
     28 
     29     doTest(l);
     30   }
     31 
     32   // Pre-resolve class names so the strings don't have to be allocated as a side effect of
     33   // callback printing.
     34   private static void prefetchClassNames() {
     35       Object.class.getName();
     36       Integer.class.getName();
     37       Float.class.getName();
     38       Short.class.getName();
     39       Byte.class.getName();
     40       Double.class.getName();
     41   }
     42 
     43   public static void doTest(ArrayList<Object> l) throws Exception {
     44     // Disable the global registration from OnLoad, to get into a known state.
     45     enableAllocationTracking(null, false);
     46 
     47     // Enable actual logging callback.
     48     setupObjectAllocCallback(true);
     49 
     50     System.out.println(Arrays.toString(getTrackingEventMessages()));
     51 
     52     enableAllocationTracking(null, true);
     53 
     54     l.add(new Object());
     55     l.add(new Integer(1));
     56 
     57     enableAllocationTracking(null, false);
     58 
     59     l.add(new Float(1.0f));
     60 
     61     enableAllocationTracking(Thread.currentThread(), true);
     62 
     63     l.add(new Short((short)0));
     64 
     65     enableAllocationTracking(Thread.currentThread(), false);
     66 
     67     l.add(new Byte((byte)0));
     68 
     69     System.out.println(Arrays.toString(getTrackingEventMessages()));
     70     System.out.println("Tracking on same thread");
     71 
     72     testThread(l, true, true);
     73 
     74     l.add(new Byte((byte)0));
     75 
     76     System.out.println(Arrays.toString(getTrackingEventMessages()));
     77     System.out.println("Tracking on same thread, not disabling tracking");
     78 
     79     testThread(l, true, false);
     80 
     81     System.out.println(Arrays.toString(getTrackingEventMessages()));
     82     System.out.println("Tracking on different thread");
     83 
     84     testThread(l, false, true);
     85 
     86     l.add(new Byte((byte)0));
     87 
     88     // Disable actual logging callback and re-enable tracking, so we can keep the event enabled and
     89     // check that shutdown works correctly.
     90     setupObjectAllocCallback(false);
     91 
     92     System.out.println(Arrays.toString(getTrackingEventMessages()));
     93 
     94     enableAllocationTracking(null, true);
     95   }
     96 
     97   private static void testThread(final ArrayList<Object> l, final boolean sameThread,
     98       final boolean disableTracking) throws Exception {
     99     final SimpleBarrier startBarrier = new SimpleBarrier(1);
    100     final SimpleBarrier trackBarrier = new SimpleBarrier(1);
    101     final SimpleBarrier disableBarrier = new SimpleBarrier(1);
    102 
    103     final Thread thisThread = Thread.currentThread();
    104 
    105     Thread t = new Thread() {
    106       public void run() {
    107         try {
    108           startBarrier.dec();
    109           trackBarrier.waitFor();
    110         } catch (Exception e) {
    111           e.printStackTrace(System.out);
    112           System.exit(1);
    113         }
    114 
    115         l.add(new Double(0.0));
    116 
    117         if (disableTracking) {
    118           enableAllocationTracking(sameThread ? this : thisThread, false);
    119         }
    120       }
    121     };
    122 
    123     t.start();
    124     startBarrier.waitFor();
    125     enableAllocationTracking(sameThread ? t : Thread.currentThread(), true);
    126     trackBarrier.dec();
    127 
    128     t.join();
    129   }
    130 
    131   private static class SimpleBarrier {
    132     int count;
    133 
    134     public SimpleBarrier(int i) {
    135       count = i;
    136     }
    137 
    138     public synchronized void dec() throws Exception {
    139       count--;
    140       notifyAll();
    141     }
    142 
    143     public synchronized void waitFor() throws Exception  {
    144       while (count != 0) {
    145         wait();
    146       }
    147     }
    148   }
    149 
    150   private static native void setupObjectAllocCallback(boolean enable);
    151   private static native void enableAllocationTracking(Thread thread, boolean enable);
    152   private static native String[] getTrackingEventMessages();
    153 }
    154