1 /*
2  * Copyright (C) 2009 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 public class Main {
18     static class ArrayMemEater {
19         static boolean sawOome;
20 
blowup(char[][] holder)21         static void blowup(char[][] holder) {
22             try {
23                 for (int i = 0; i < holder.length; ++i) {
24                     holder[i] = new char[1024 * 1024];
25                 }
26             } catch (OutOfMemoryError oome) {
27                 ArrayMemEater.sawOome = true;
28             }
29         }
30     }
31 
32     static class InstanceMemEater {
33         static boolean sawOome;
34 
35         InstanceMemEater next;
36         double d1, d2, d3, d4, d5, d6, d7, d8; // Bloat this object so we fill the heap faster.
37 
allocate()38         static InstanceMemEater allocate() {
39             try {
40                 return new InstanceMemEater();
41             } catch (OutOfMemoryError e) {
42                 InstanceMemEater.sawOome = true;
43                 return null;
44             }
45         }
46 
confuseCompilerOptimization(InstanceMemEater instance)47         static void confuseCompilerOptimization(InstanceMemEater instance) {
48         }
49     }
50 
triggerArrayOOM()51     static boolean triggerArrayOOM() {
52         ArrayMemEater.blowup(new char[128 * 1024][]);
53         return ArrayMemEater.sawOome;
54     }
55 
triggerInstanceOOM()56     static boolean triggerInstanceOOM() {
57         InstanceMemEater memEater = InstanceMemEater.allocate();
58         InstanceMemEater lastMemEater = memEater;
59         do {
60             lastMemEater.next = InstanceMemEater.allocate();
61             lastMemEater = lastMemEater.next;
62         } while (lastMemEater != null);
63         memEater.confuseCompilerOptimization(memEater);
64         return InstanceMemEater.sawOome;
65     }
66 
main(String[] args)67     public static void main(String[] args) {
68         if (triggerArrayOOM()) {
69             System.out.println("NEW_ARRAY correctly threw OOME");
70         }
71 
72         if (triggerInstanceOOM()) {
73             System.out.println("NEW_INSTANCE correctly threw OOME");
74         }
75     }
76 }
77