1 /*
   2  * Copyright (c) 2017, 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 8174749
  27  * @summary MemberNameTable should reuse entries
  28  * @library /test/lib
  29  * @build sun.hotspot.WhiteBox
  30  * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
  31  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. MemberNameLeak
  32  */
  33 
  34 import java.lang.invoke.*;
  35 import jdk.test.lib.process.OutputAnalyzer;
  36 import jdk.test.lib.process.ProcessTools;
  37 
  38 import sun.hotspot.code.Compiler;

  39 
  40 public class MemberNameLeak {
  41     static class Leak {
  42       public void callMe() {
  43       }
  44 
  45       public static void main(String[] args) throws Throwable {
  46         Leak leak = new Leak();
  47 
  48         for (int i = 0; i < 10; i++) {
  49           MethodHandles.Lookup lookup = MethodHandles.lookup();
  50           MethodType mt = MethodType.fromMethodDescriptorString("()V", Leak.class.getClassLoader());
  51           // findSpecial leaks some native mem
  52           MethodHandle mh = lookup.findSpecial(Leak.class, "callMe", mt, Leak.class);
  53           mh.invokeExact(leak);
  54         }
  55 
  56         System.gc();  // make mh unused
  57       }
  58     }
  59 
  60     public static void test(String gc) throws Throwable {
  61        // Run this Leak class with logging
  62         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  63                                       "-Xlog:membername+table=trace",

  64                                       gc, Leak.class.getName());
  65         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  66         output.shouldContain("ResolvedMethod entry added for MemberNameLeak$Leak.callMe()V");
  67         output.shouldContain("ResolvedMethod entry found for MemberNameLeak$Leak.callMe()V");
  68         output.shouldContain("ResolvedMethod entry removed");
  69         output.shouldHaveExitValue(0);
  70     }
  71 
  72     public static void main(java.lang.String[] unused) throws Throwable {
  73         test("-XX:+UseG1GC");
  74         test("-XX:+UseParallelGC");
  75         test("-XX:+UseSerialGC");
  76         if (!Compiler.isGraalEnabled()) { // Graal does not support CMS
  77             test("-XX:+UseConcMarkSweepGC");



  78         }
  79     }
  80 }
--- EOF ---