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
17public class Main {
18    static class ArrayMemEater {
19        static boolean sawOome;
20
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
38        static InstanceMemEater allocate() {
39            try {
40                return new InstanceMemEater();
41            } catch (OutOfMemoryError e) {
42                InstanceMemEater.sawOome = true;
43                return null;
44            }
45        }
46
47        static void confuseCompilerOptimization(InstanceMemEater instance) {
48        }
49    }
50
51    static boolean triggerArrayOOM() {
52        ArrayMemEater.blowup(new char[128 * 1024][]);
53        return ArrayMemEater.sawOome;
54    }
55
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
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