1 /*
2 * Copyright (c) 2017, 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
24 /*
25 * @test
26 * @bug 8046171
27 * @summary Test access to private static fields between nestmates and nest-host
28 * using different flavours of named nested types using MethodHandles
29 * @run main TestMethodHandles
30 */
31
32 import java.lang.invoke.*;
33 import static java.lang.invoke.MethodHandles.*;
34
35 import java.lang.reflect.Field;
36
37 public class TestMethodHandles {
38
39 // private static field of nest-host for nestmates to access
40 private static int priv_field;
41
42 // public constructor so we aren't relying on private access
43 public TestMethodHandles() {}
44
45 // Methods that will access private static fields of nestmates
46
47 // NOTE: No InnerNested calls in this test because non-static nested types
48 // can't have static fields. Also no StaticIface calls as static interface
49 // fields must be public (and final)
50
51 void access_priv(TestMethodHandles o) throws Throwable {
52 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
53 priv_field = (int) mh.invoke();
54 priv_field = (int) mh.invokeExact();
55 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
56 mh.invoke(2);
57 mh.invokeExact(3);
58 }
59 void access_priv(StaticNested o) throws Throwable {
60 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
61 priv_field = (int) mh.invoke();
62 priv_field = (int) mh.invokeExact();
63 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
64 mh.invoke(2);
65 mh.invokeExact(3);
66 }
67
68 // The various nestmates
69
70 static interface StaticIface {
71
72 // Methods that will access private static fields of nestmates
73
74 default void access_priv(TestMethodHandles o) throws Throwable {
75 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
76 int priv_field = (int) mh.invoke();
77 priv_field = (int) mh.invokeExact();
78 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
79 mh.invoke(2);
80 mh.invokeExact(3);
81 }
82 default void access_priv(StaticNested o) throws Throwable {
83 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
84 int priv_field = (int) mh.invoke();
85 priv_field = (int) mh.invokeExact();
86 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
87 mh.invoke(2);
88 mh.invokeExact(3);
89 }
90 }
91
92 static class StaticNested {
93
94 private static int priv_field;
95
96 // public constructor so we aren't relying on private access
97 public StaticNested() {}
98
99 // Methods that will access private static fields of nestmates
100
101 void access_priv(TestMethodHandles o) throws Throwable {
102 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
103 priv_field = (int) mh.invoke();
104 priv_field = (int) mh.invokeExact();
105 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
106 mh.invoke(2);
107 mh.invokeExact(3);
108 }
109 void access_priv(StaticNested o) throws Throwable {
110 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
111 priv_field = (int) mh.invoke();
112 priv_field = (int) mh.invokeExact();
113 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
114 mh.invoke(2);
115 mh.invokeExact(3);
116 }
117 }
118
119 class InnerNested {
120
121 // public constructor so we aren't relying on private access
122 public InnerNested() {}
123
124 void access_priv(TestMethodHandles o) throws Throwable {
125 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
126 priv_field = (int) mh.invoke();
127 priv_field = (int) mh.invokeExact();
128 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
129 mh.invoke(2);
130 mh.invokeExact(3);
131 }
132 void access_priv(StaticNested o) throws Throwable {
133 MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
134 priv_field = (int) mh.invoke();
135 priv_field = (int) mh.invokeExact();
136 mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
137 mh.invoke(2);
138 mh.invokeExact(3);
139 }
140 }
141
142 public static void main(String[] args) throws Throwable {
143 TestMethodHandles o = new TestMethodHandles();
144 StaticNested s = new StaticNested();
145 InnerNested i = o.new InnerNested();
146 StaticIface intf = new StaticIface() {};
147
148 o.access_priv(new TestMethodHandles());
149 o.access_priv(s);
150
151 s.access_priv(o);
152 s.access_priv(new StaticNested());
153
154 i.access_priv(o);
155 i.access_priv(s);
156
157 intf.access_priv(o);
158 intf.access_priv(s);
159 }
160 }