1/*
2 * Copyright (C) 2015 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
17import dalvik.system.VMDebug;
18import java.io.IOException;
19import java.lang.ref.PhantomReference;
20import java.lang.ref.ReferenceQueue;
21import java.lang.ref.WeakReference;
22import libcore.util.NativeAllocationRegistry;
23
24/**
25 * Program used to create a heap dump for test purposes.
26 */
27public class Main {
28  // Keep a reference to the DumpedStuff instance so that it is not garbage
29  // collected before we take the heap dump.
30  public static DumpedStuff stuff;
31
32  // We will take a heap dump that includes a single instance of this
33  // DumpedStuff class. Objects stored as fields in this class can be easily
34  // found in the hprof dump by searching for the instance of the DumpedStuff
35  // class and reading the desired field.
36  public static class DumpedStuff {
37    public String basicString = "hello, world";
38    public char[] charArray = "char thing".toCharArray();
39    public String nullString = null;
40    public Object anObject = new Object();
41    public ReferenceQueue<Object> referenceQueue = new ReferenceQueue<Object>();
42    public PhantomReference aPhantomReference = new PhantomReference(anObject, referenceQueue);
43    public WeakReference aWeakReference = new WeakReference(anObject, referenceQueue);
44    public byte[] bigArray;
45
46    DumpedStuff() {
47      int N = 1000000;
48      bigArray = new byte[N];
49      for (int i = 0; i < N; i++) {
50        bigArray[i] = (byte)((i*i) & 0xFF);
51      }
52
53      NativeAllocationRegistry registry = new NativeAllocationRegistry(
54          Main.class.getClassLoader(), 0x12345, 42);
55      registry.registerNativeAllocation(anObject, 0xABCDABCD);
56    }
57  }
58
59  public static void main(String[] args) throws IOException {
60    if (args.length < 1) {
61      System.err.println("no output file specified");
62      return;
63    }
64    String file = args[0];
65
66    // Allocate the instance of DumpedStuff.
67    stuff = new DumpedStuff();
68
69    // Take a heap dump that will include that instance of DumpedStuff.
70    System.err.println("Dumping hprof data to " + file);
71    VMDebug.dumpHprofData(file);
72  }
73}
74