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
17import java.lang.reflect.Field;
18import sun.misc.Unsafe;
19
20public class Main {
21  private static void assertLongEquals(long expected, long result) {
22    if (expected != result) {
23      throw new Error("Expected: " + expected + ", found: " + result);
24    }
25  }
26
27  private static Unsafe getUnsafe() throws Exception {
28    Class<?> unsafeClass = Class.forName("sun.misc.Unsafe");
29    Field f = unsafeClass.getDeclaredField("theUnsafe");
30    f.setAccessible(true);
31    return (Unsafe) f.get(null);
32  }
33
34  public static void main(String[] args) throws Exception {
35    System.loadLibrary(args[0]);
36    Unsafe unsafe = getUnsafe();
37
38    testUnsafeGetLong(unsafe);
39  }
40
41  public static void testUnsafeGetLong(Unsafe unsafe) throws Exception {
42    TestClass test = new TestClass();
43    Field longField = TestClass.class.getDeclaredField("longVar");
44    long lvar = unsafe.objectFieldOffset(longField);
45    lvar = unsafe.getLong(test, lvar);
46    assertLongEquals(1122334455667788L, lvar);
47  }
48
49  private static class TestClass {
50    public long longVar = 1122334455667788L;
51  }
52}
53