1 /*

     2  * Copyright (c) 2018, 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 that private Lookup works for both nestmate-enabled classes

    28  * and legacy classes

    29  * @compile TestPrivateLookup.java

    30  * @run main TestPrivateLookup

    31  * @compile -source 10 -target 10 TestPrivateLookup.java

    32  * @run main TestPrivateLookup noNestmates

    33  */

    34 

    35 // Need the explicit first @compile above so that jtreg forces recompilation

    36 // with latest version. Otherwise compile-on-demand sees the JDK 10 version

    37 // and assumes it is up to date and then runs the test using that version -

    38 // which fails.

    39 

    40 import java.lang.invoke.*;

    41 import static java.lang.invoke.MethodHandles.*;

    42 import static java.lang.invoke.MethodType.*;

    43 

    44 public class TestPrivateLookup {

    45 

    46     static boolean compiledForNestmates;

    47 

    48     static class C {

    49         static class D {

    50             private void m() { }

    51         }

    52 

    53         static void test() throws Throwable {

    54             MethodType M_T = MethodType.methodType(void.class);

    55             // Direct lookup from C

    56             Lookup l = lookup();

    57             try {

    58                 MethodHandle mh = l.findVirtual(D.class, "m", M_T);

    59                 if (compiledForNestmates) {

    60                     System.out.println("Lookup of D.m from C succeeded as expected with nestmates");

    61                 }

    62                 else {

    63                     throw new Error("Unexpected success when not compiled for nestmates!");

    64                 }

    65             }

    66             catch (IllegalAccessException iae) {

    67                 if (!compiledForNestmates) {

    68                     System.out.println("Lookup of D.m from C failed as expected without nestmates");

    69                 }

    70                 else {

    71                     throw new Error("Unexpected failure with nestmates", iae);

    72                 }

    73             }

    74             // switch lookup class to D

    75             l = l.in(D.class);

    76             try {

    77                 MethodHandle mh = l.findVirtual(D.class, "m", M_T);

    78                 System.out.println("Lookup of D.m from D succeeded as expected" +

    79                                    " with" + (compiledForNestmates ? "" : "out") +

    80                                    " nestmates");

    81             }

    82             catch (IllegalAccessException iae) {

    83                 throw new Error("Lookup of D.m from D failed", iae);

    84             }

    85         }

    86     }

    87 

    88     public static void main(String[] args) throws Throwable {

    89 

    90         // If there's no nesthost attribute A.getNestHost() == A

    91         compiledForNestmates = C.D.class.getNestHost() == TestPrivateLookup.class;

    92         // sanity check

    93         boolean expectingNestmates = args.length == 0;

    94 

    95         if (compiledForNestmates && !expectingNestmates) {

    96             throw new Error("Test is being run incorrectly: " +

    97                             "nestmates are being used but not expected");

    98         }

    99         if (expectingNestmates && !compiledForNestmates) {

   100             throw new Error("Test is being run incorrectly: " +

   101                             "nestmates are expected but not being used");

   102         }

   103         System.out.println("Testing with" + (expectingNestmates ? "" : "out") +

   104                            " nestmates");

   105 

   106         C.test();

   107     }

   108 }