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 }