Test908.java revision 351ba5aaa52216536a82486acb91dcf779b00478 
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
17package art;
18
19import java.util.ArrayList;
20
21public class Test908 {
22  public static void run() throws Exception {
23    doTest();
24  }
25
26  public static void doTest() throws Exception {
27    // Use a list to ensure objects must be allocated.
28    ArrayList<Object> l = new ArrayList<>(100);
29
30    setupGcCallback();
31
32    enableGcTracking(true);
33    run(l);
34
35    enableGcTracking(false);
36    run(l);
37  }
38
39  private static void run(ArrayList<Object> l) {
40    allocate(l, 1);
41    l.clear();
42
43    Runtime.getRuntime().gc();
44
45    printStats();
46
47    // Note: the reporting will not depend on the heap layout (which could be unstable). Walking
48    //       the tag table should give us a stable output order.
49    for (int i = 10; i <= 1000; i *= 10) {
50      allocate(l, i);
51    }
52    l.clear();
53
54    Runtime.getRuntime().gc();
55
56    printStats();
57
58    Runtime.getRuntime().gc();
59
60    printStats();
61  }
62
63  private static void allocate(ArrayList<Object> l, long tag) {
64    Object obj = new Object();
65    l.add(obj);
66  }
67
68  private static void printStats() {
69      System.out.println("---");
70      int s = getGcStarts();
71      int f = getGcFinishes();
72      System.out.println((s > 0) + " " + (f > 0));
73  }
74
75  private static native void setupGcCallback();
76  private static native void enableGcTracking(boolean enable);
77  private static native int getGcStarts();
78  private static native int getGcFinishes();
79}
80