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 8174749

    27  * @summary MemberNameTable should reuse entries

    28  * @library /test/lib

    29  * @run main MemberNameLeak

    30  */

    31 

    32 import java.lang.invoke.*;

    33 import jdk.test.lib.process.OutputAnalyzer;

    34 import jdk.test.lib.process.ProcessTools;

    35 

    36 public class MemberNameLeak {

    37     static class Leak {

    38       public void callMe() {

    39       }

    40 

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

    42         Leak leak = new Leak();

    43 

    44         for (int i = 0; i < 10; i++) {

    45           MethodHandles.Lookup lookup = MethodHandles.lookup();

    46           MethodType mt = MethodType.fromMethodDescriptorString("()V", Leak.class.getClassLoader());

    47           // findSpecial leaks some native mem

    48           MethodHandle mh = lookup.findSpecial(Leak.class, "callMe", mt, Leak.class);

    49           mh.invokeExact(leak);

    50         }

    51 

    52         System.gc();  // make mh unused

    53       }

    54     }

    55 

    56     public static void test(String gc) throws Throwable {

    57        // Run this Leak class with logging

    58         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

    59                                       "-Xlog:membername+table=trace",

    60                                       gc, Leak.class.getName());

    61         OutputAnalyzer output = new OutputAnalyzer(pb.start());

    62         output.shouldContain("ResolvedMethod entry added for MemberNameLeak$Leak.callMe()V");

    63         output.shouldContain("ResolvedMethod entry found for MemberNameLeak$Leak.callMe()V");

    64         output.shouldContain("ResolvedMethod entry removed for MemberNameLeak$Leak.callMe()V");

    65         output.shouldHaveExitValue(0);

    66     }

    67 

    68     public static void main(java.lang.String[] unused) throws Throwable {

    69         test("-XX:+UseG1GC");

    70         test("-XX:+UseParallelGC");

    71         test("-XX:+UseSerialGC");

    72         test("-XX:+UseConcMarkSweepGC");

    73     }

    74 }