UnsafeTest.java revision 09bcea1fd2a0bade07ab034352fde6c6ff6e01a6 
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
17package sun.misc;
18
19import junit.framework.TestCase;
20
21import java.lang.reflect.Field;
22import java.util.concurrent.Callable;
23import java.util.concurrent.Executors;
24
25public class UnsafeTest extends TestCase {
26
27    public void test_getUnsafeForbidden() {
28        try {
29            Unsafe.getUnsafe();
30            fail();
31        } catch (SecurityException expected) {
32        }
33    }
34
35    /**
36     * Regression for 2053217. We used to look one level higher than necessary
37     * on the stack.
38     */
39    public void test_getUnsafeForbiddenWithSystemCaller() throws Exception {
40        Callable<Object> callable = Executors.callable(new Runnable() {
41            public void run() {
42                Unsafe.getUnsafe();
43            }
44        });
45
46        try {
47            callable.call();
48            fail();
49        } catch (SecurityException expected) {
50        }
51    }
52
53    private class AllocateInstanceTestClass {
54        public int i = 123;
55        public String s = "hello";
56        public Object getThis() { return AllocateInstanceTestClass.this; }
57    }
58
59    private static Unsafe getUnsafe() throws Exception {
60        Class<?> unsafeClass = Class.forName("sun.misc.Unsafe");
61        Field f = unsafeClass.getDeclaredField("theUnsafe");
62        f.setAccessible(true);
63        return (Unsafe) f.get(null);
64    }
65
66    public void test_allocateInstance() throws Exception {
67        AllocateInstanceTestClass i = (AllocateInstanceTestClass)
68                getUnsafe().allocateInstance(AllocateInstanceTestClass.class);
69        assertEquals(0, i.i);
70        assertEquals(null, i.s);
71        assertEquals(i, i.getThis());
72    }
73}
74