1 /*
2 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package p;
24
25 import java.lang.invoke.MethodHandle;
26 import java.lang.invoke.MethodHandles;
27 import java.lang.invoke.MethodHandles.Lookup;
28 import java.lang.reflect.Modifier;
29
30 import static java.lang.invoke.MethodHandles.Lookup.*;
31
32 import org.testng.annotations.BeforeTest;
33 import org.testng.annotations.Test;
34 import static org.testng.Assert.*;
35
36 /**
37 * Unit tests for MethodHandles.privateLookupIn
38 */
39
40 @Test
41 public class PrivateLookupInTests {
42
43 /**
44 * A public and non-public types in the test module but in a different
45 * package to the test class.
46 *
47 * package p.internal;
48 * public class PublicType {
49 * }
50 *
51 * package p.internal;
52 * class NonPublicType {
53 * private static final Object obj = ...
54 * }
55 */
56 private Class<?> publicType;
57 private Class<?> nonPublicType;
58
59 // initialize and sanity check publicType/nonPublicType
60 @BeforeTest
61 public void init() throws Exception {
62 publicType = Class.forName("p.internal.PublicType");
63 assertTrue(this.getClass().getModule() == publicType.getModule());
64 assertNotEquals(this.getClass().getPackageName(), publicType.getPackageName());
65 assertTrue(Modifier.isPublic(publicType.getModifiers()));
66
67 nonPublicType = Class.forName("p.internal.NonPublicType");
68 assertTrue(this.getClass().getModule() == nonPublicType.getModule());
69 assertNotEquals(this.getClass().getPackageName(), nonPublicType.getPackageName());
70 assertFalse(Modifier.isPublic(nonPublicType.getModifiers()));
71 }
72
73 // Invoke MethodHandles.privateLookupIn with a full-power caller
74 public void testAllAccessCallerSameModule() throws Throwable {
75 Lookup lookup = MethodHandles.privateLookupIn(nonPublicType, MethodHandles.lookup());
76 assertTrue(lookup.lookupClass() == nonPublicType);
77 assertTrue(lookup.hasPrivateAccess());
78
79 // get obj field
80 MethodHandle mh = lookup.findStaticGetter(nonPublicType, "obj", Object.class);
81 Object obj = mh.invokeExact();
82 }
83
84 // Invoke MethodHandles.privateLookupIn with a reduced-power caller
85 @Test(expectedExceptions = {IllegalAccessException.class})
86 public void testReducedAccessCallerSameModule() throws Throwable {
87 Lookup caller = MethodHandles.lookup().dropLookupMode(PACKAGE);
88 assertTrue((caller.lookupModes() & PRIVATE) == 0);
89 assertTrue((caller.lookupModes() & PACKAGE) == 0);
90 assertTrue((caller.lookupModes() & MODULE) != 0);
91
92 Lookup lookup = MethodHandles.privateLookupIn(nonPublicType, caller);
93 }
94
95 // Invoke MethodHandles.privateLookupIn with the public lookup as caller
96 @Test(expectedExceptions = {IllegalAccessException.class})
97 public void testPublicLookupSameModule() throws Exception {
98 Lookup caller = MethodHandles.publicLookup();
99 Lookup lookup = MethodHandles.privateLookupIn(publicType, caller);
100 }
101
102 // test reads m1, open module m1 containing p1
103 public void testTargetClassInOpenModule() throws Throwable {
104 // m1/p1.Type
105 Class<?> clazz = Class.forName("p1.Type");
106 assertEquals(clazz.getModule().getName(), "m1");
107
108 // ensure that this module reads m1
109 Module thisModule = getClass().getModule();
110 Module m1 = clazz.getModule();
111 thisModule.addReads(clazz.getModule());
112 assertTrue(m1.isOpen("p1", thisModule));
113
114 Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
115 assertTrue(lookup.lookupClass() == clazz);
116 assertTrue(lookup.hasPrivateAccess());
117
118 // get obj field
119 MethodHandle mh = lookup.findStaticGetter(clazz, "obj", Object.class);
120 Object obj = mh.invokeExact();
121 }
122
123 // test target class in unnamed module
124 public void testTargetClassInUnnamedModule() throws Throwable {
125 Class<?> clazz = Class.forName("Unnamed");
126 assertFalse(clazz.getModule().isNamed());
127
128 // thisModule does not read the unnamed module
129 Module thisModule = getClass().getModule();
130 assertFalse(thisModule.canRead(clazz.getModule()));
131 try {
132 MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
133 assertTrue(false);
134 } catch (IllegalAccessException expected) { }
135
136 // thisModule reads the unnamed module
137 thisModule.addReads(clazz.getModule());
138 Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
139 assertTrue(lookup.lookupClass() == clazz);
140 assertTrue(lookup.hasPrivateAccess());
141 }
142
143 // test does not read m2, m2 opens p2 to test
144 @Test(expectedExceptions = {IllegalAccessException.class})
145 public void testCallerDoesNotRead() throws Throwable {
146 // m2/p2.Type
147 Class<?> clazz = Class.forName("p2.Type");
148 assertEquals(clazz.getModule().getName(), "m2");
149
150 Module thisModule = getClass().getModule();
151 Module m2 = clazz.getModule();
152 assertFalse(thisModule.canRead(m2));
153 assertTrue(m2.isOpen("p2", thisModule));
154
155 Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
156 }
157
158 // test reads m3, m3 does not open p3 to test
159 @Test(expectedExceptions = {IllegalAccessException.class})
160 public void testNotOpenToCaller() throws Throwable {
161 // m3/p2.Type
162 Class<?> clazz = Class.forName("p3.Type");
163 assertEquals(clazz.getModule().getName(), "m3");
164
165 Module thisModule = getClass().getModule();
166 Module m3 = clazz.getModule();
167 thisModule.addReads(clazz.getModule());
168 assertFalse(m3.isOpen("p3", thisModule));
169
170 Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
171 }
172
173 // Invoke MethodHandles.privateLookupIn with a primitive class
174 @Test(expectedExceptions = {IllegalArgumentException.class})
175 public void testPrimitiveClassAsTargetClass() throws Exception {
176 MethodHandles.privateLookupIn(int.class, MethodHandles.lookup());
177 }
178
179 // Invoke MethodHandles.privateLookupIn with an array class
180 @Test(expectedExceptions = {IllegalArgumentException.class})
181 public void testArrayClassAsTargetClass() throws Exception {
182 MethodHandles.privateLookupIn(PrivateLookupInTests[].class, MethodHandles.lookup());
183 }
184
185 // Invoke MethodHandles.privateLookupIn with a primitive array class
186 @Test(expectedExceptions = {IllegalArgumentException.class})
187 public void testPrimitiveArrayClassAsTargetClass() throws Exception {
188 MethodHandles.privateLookupIn(int[].class, MethodHandles.lookup());
189 }
190
191 // Invoke MethodHandles.privateLookupIn with null
192 @Test(expectedExceptions = {NullPointerException.class})
193 public void testNullTargetClass() throws Exception {
194 MethodHandles.privateLookupIn(null, MethodHandles.lookup());
195 }
196
197 // Invoke MethodHandles.privateLookupIn with null
198 @Test(expectedExceptions = {NullPointerException.class})
199 public void testNullCaller() throws Exception {
200 MethodHandles.privateLookupIn(getClass(), null);
201 }
202 }