1/*
2 * Copyright (C) 2011 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 java.lang.reflect.Method;
18import java.util.ArrayList;
19import java.util.List;
20
21public class Main {
22
23    public static void main(String[] args) throws Exception {
24        int alloc1 = 1;
25        // Setup reflection stuff before allocating to prevent OOME caused by allocations from
26        // Class.forName or getDeclaredMethod.
27        // Reflective equivalent of: dalvik.system.VMRuntime.getRuntime().clearGrowthLimit();
28        final Class<?> vm_runtime = Class.forName("dalvik.system.VMRuntime");
29        final Method get_runtime = vm_runtime.getDeclaredMethod("getRuntime");
30        final Object runtime = get_runtime.invoke(null);
31        final Method clear_growth_limit = vm_runtime.getDeclaredMethod("clearGrowthLimit");
32        List<byte[]> l = new ArrayList<byte[]>();
33        try {
34            while (true) {
35                // Allocate a MB at a time
36                l.add(new byte[1048576]);
37                alloc1++;
38            }
39        } catch (OutOfMemoryError e) {
40            l = null;
41        }
42        // Expand the heap to the maximum size.
43        clear_growth_limit.invoke(runtime);
44        int alloc2 = 1;
45        l = new ArrayList<byte[]>();
46        try {
47            while (true) {
48                // Allocate a MB at a time
49                l.add(new byte[1048576]);
50                alloc2++;
51            }
52        } catch (OutOfMemoryError e2) {
53            l = null;
54            if (alloc1 > alloc2) {
55                System.out.println("ERROR: Allocated less memory after growth" +
56                    "limit cleared (" + alloc1 + " MBs > " + alloc2 + " MBs");
57                System.exit(1);
58            }
59        }
60        System.out.println("Test complete");
61    }
62}
63