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.

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     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

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    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.

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    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 }