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 
17 import dalvik.system.VMDebug;
18 import java.io.IOException;
19 import org.apache.harmony.dalvik.ddmc.DdmVmInternal;
20 
21 /**
22  * Program used to create a heap dump for test purposes.
23  */
24 public class Main {
25   // Keep a reference to the DumpedStuff instance so that it is not garbage
26   // collected before we take the heap dump.
27   public static DumpedStuff stuff;
28 
main(String[] args)29   public static void main(String[] args) throws IOException {
30     if (args.length < 1) {
31       System.err.println("no output file specified");
32       return;
33     }
34     String file = args[0];
35 
36     // If a --base argument is provided, it means we should generate a
37     // baseline hprof file suitable for using in testing diff.
38     boolean baseline = args.length > 1 && args[1].equals("--base");
39 
40     // Enable allocation tracking so we get stack traces in the heap dump.
41     DdmVmInternal.enableRecentAllocations(true);
42 
43     // Allocate the instance of DumpedStuff.
44     stuff = new DumpedStuff(baseline);
45 
46     // Create a bunch of unreachable objects pointing to basicString for the
47     // reverseReferencesAreNotUnreachable test
48     for (int i = 0; i < 100; i++) {
49       stuff.basicStringRef = new Object[]{stuff.basicString};
50     }
51 
52     stuff.shouldNotGc();
53 
54     // Take a heap dump that will include that instance of DumpedStuff.
55     System.err.println("Dumping hprof data to " + file);
56     VMDebug.dumpHprofData(file);
57   }
58 }
59