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  * @run main TestPrivateLookup
  30  * @compile -source 10 -target 10 TestPrivateLookup.java
  31  * @run main TestPrivateLookup noNestmates
  32  */
  33 import java.lang.invoke.*;
  34 import static java.lang.invoke.MethodHandles.*;
  35 import static java.lang.invoke.MethodType.*;
  36 
  37 public class TestPrivateLookup {
  38 
  39     static boolean VMHasNestmates =
  40         System.getProperty("java.vm.specification.version").equals("10");
  41     static boolean compiledForNestmates;
  42 
  43     static class C {
  44         static class D {
  45             private void m() { }
  46         }
  47 
  48         static void test() throws Throwable {
  49             MethodType M_T = MethodType.methodType(void.class);
  50             // Direct lookup from C
  51             Lookup l = lookup();
  52             try {
  53                 MethodHandle mh = l.findVirtual(D.class, "m", M_T);
  54                 if (compiledForNestmates) {
  55                     System.out.println("Lookup of D.m from C succeeded as expected with nestmates");
  56                 }
  57                 else {
  58                     throw new Error("Unexpected success when not compiled for nestmates!");
  59                 }
  60             }
  61             catch (IllegalAccessException iae) {
  62                 if (!compiledForNestmates) {
  63                     System.out.println("Lookup of D.m from C failed as expected without nestmates");
  64                 }
  65                 else {
  66                     throw new Error("Unexpected failure with nestmates", iae);
  67                 }
  68             }
  69             // switch lookup class to D
  70             l = l.in(D.class);
  71             try {
  72                 MethodHandle mh = l.findVirtual(D.class, "m", M_T);
  73                 System.out.println("Lookup of D.m from D succeeded as expected" +
  74                                    " with" + (compiledForNestmates ? "" : "out") +
  75                                    " nestmates");
  76             }
  77             catch (IllegalAccessException iae) {
  78                 throw new Error("Lookup of D.m from D failed", iae);
  79             }
  80         }
  81     }
  82 
  83     public static void main(String[] args) throws Throwable {
  84         if (!VMHasNestmates) {
  85             throw new Error("This test is only for JDK 11 with nestmates");
  86         }
  87 
  88         // If there's no nesthost attribute A.getNestHost() == A
  89         compiledForNestmates = C.D.class.getNestHost() == TestPrivateLookup.class;
  90         // sanity check
  91         boolean expectingNestmates = args.length == 0;
  92 
  93         if (compiledForNestmates && !expectingNestmates) {
  94             throw new Error("Test is being run incorrectly: " +
  95                             "nestmates are being used but not expected");
  96         }
  97         if (expectingNestmates && !compiledForNestmates) {
  98             throw new Error("Test is being run incorrectly: ": +
  99                             "nestmates are expected but not being used");
 100         }
 101         System.out.println("Testing with" + (expectingNestmates ? "" : "out") +
 102                            " nestmates");
 103 
 104         C.test();
 105     }
 106 }