Main.java revision c60bdf667b5c6fa767548942f0115547523593b4 
1/*
2 * Copyright (C) 2013 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.*;
18import java.lang.Runtime;
19
20public class Main {
21    static Object nativeLock = new Object();
22    static int nativeBytes = 0;
23    static Object runtime;
24    static Method register_native_allocation;
25    static Method register_native_free;
26    static long maxMem = 0;
27
28    static class NativeAllocation {
29        private int bytes;
30
31        NativeAllocation(int bytes) throws Exception {
32            this.bytes = bytes;
33            register_native_allocation.invoke(runtime, bytes);
34            synchronized (nativeLock) {
35                nativeBytes += bytes;
36                if (nativeBytes > maxMem) {
37                    throw new OutOfMemoryError();
38                }
39            }
40        }
41
42        protected void finalize() throws Exception {
43            synchronized (nativeLock) {
44                nativeBytes -= bytes;
45            }
46            register_native_free.invoke(runtime, bytes);
47        }
48    }
49
50    public static void main(String[] args) throws Exception {
51        Class<?> vm_runtime = Class.forName("dalvik.system.VMRuntime");
52        Method get_runtime = vm_runtime.getDeclaredMethod("getRuntime");
53        runtime = get_runtime.invoke(null);
54        register_native_allocation = vm_runtime.getDeclaredMethod("registerNativeAllocation", Integer.TYPE);
55        register_native_free = vm_runtime.getDeclaredMethod("registerNativeFree", Integer.TYPE);
56        maxMem = Runtime.getRuntime().maxMemory();
57        int count = 16;
58        int size = (int)(maxMem / 2 / count);
59        int allocation_count = 256;
60        NativeAllocation[] allocations = new NativeAllocation[count];
61        for (int i = 0; i < allocation_count; ++i) {
62            allocations[i % count] = new NativeAllocation(size);
63        }
64        System.out.println("Test complete");
65    }
66}
67
68