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 import sun.hotspot.WhiteBox;
  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         WhiteBox wb = WhiteBox.getWhiteBox();
  48         int removedCountOrig =  wb.resolvedMethodRemovedCount();
  49         int removedCount;
  50 
  51         for (int i = 0; i < 10; i++) {
  52           MethodHandles.Lookup lookup = MethodHandles.lookup();
  53           MethodType mt = MethodType.fromMethodDescriptorString("()V", Leak.class.getClassLoader());
  54           // findSpecial leaks some native mem
  55           MethodHandle mh = lookup.findSpecial(Leak.class, "callMe", mt, Leak.class);
  56           mh.invokeExact(leak);
  57         }
  58 
  59         System.gc();  // make mh unused
  60 
  61         // Wait until ServiceThread cleans ResolvedMethod table
  62         do {
  63           removedCount = wb.resolvedMethodRemovedCount();
  64         } while (removedCountOrig == removedCount);
  65       }
  66     }
  67 
  68     public static void test(String gc) throws Throwable {
  69        // Run this Leak class with logging
  70         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  71                                       "-Xlog:membername+table=trace",
  72                                       "-XX:+WhiteBoxAPI",
  73                                       "-Xbootclasspath/a:.",
  74                                       gc, Leak.class.getName());
  75         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  76         output.shouldContain("ResolvedMethod entry added for MemberNameLeak$Leak.callMe()V");
  77         output.shouldContain("ResolvedMethod entry found for MemberNameLeak$Leak.callMe()V");
  78         output.shouldContain("ResolvedMethod entry removed");
  79         output.shouldHaveExitValue(0);
  80     }
  81 
  82     public static void main(java.lang.String[] unused) throws Throwable {
  83         test("-XX:+UseG1GC");
  84         test("-XX:+UseParallelGC");
  85         test("-XX:+UseSerialGC");
  86         if (!Compiler.isGraalEnabled()) { // Graal does not support CMS
  87             test("-XX:+UseConcMarkSweepGC");
  88         }
  89     }
  90 }