1 /*
   2  * Copyright (c) 2013, 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 CompressedClassSpaceSizeInJmapHeap
  26  * @bug 8004924
  27  * @summary Checks that jmap -heap contains the flag CompressedClassSpaceSize
  28  * @requires vm.hasSAandCanAttach & (vm.opt.final.UseCompressedOops == true)
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:CompressedClassSpaceSize=50m CompressedClassSpaceSizeInJmapHeap
  33  */
  34 
  35 import jdk.test.lib.JDKToolLauncher;
  36 import jdk.test.lib.Platform;
  37 import jdk.test.lib.process.OutputAnalyzer;
  38 import jdk.test.lib.process.ProcessTools;
  39 import java.nio.file.*;
  40 import java.io.File;
  41 import java.nio.charset.Charset;
  42 import java.util.List;
  43 
  44 public class CompressedClassSpaceSizeInJmapHeap {
  45     // Note that on some platforms it may require root privileges to run this test.
  46     public static void main(String[] args) throws Exception {
  47         if (!Platform.is64bit()) {
  48             // Compressed Class Space is only available on 64-bit JVMs
  49             return;
  50         }
  51 
  52         String pid = Long.toString(ProcessTools.getProcessId());
  53 
  54         JDKToolLauncher jmap = JDKToolLauncher.create("jhsdb")
  55                                               .addToolArg("jmap")
  56                                               .addToolArg("--heap")
  57                                               .addToolArg("--pid")
  58                                               .addToolArg(pid);
  59         ProcessBuilder pb = new ProcessBuilder(jmap.getCommand());
  60 
  61         File out = new File("CompressedClassSpaceSizeInJmapHeap.stdout.txt");
  62         pb.redirectOutput(out);
  63 
  64         File err = new File("CompressedClassSpaceSizeInJmapHeap.stderr.txt");
  65         pb.redirectError(err);
  66 
  67         run(pb);
  68 
  69         OutputAnalyzer output = new OutputAnalyzer(read(out));
  70         output.shouldContain("CompressedClassSpaceSize = 52428800 (50.0MB)");
  71         out.delete();
  72     }
  73 
  74     private static void run(ProcessBuilder pb) throws Exception {
  75         Process p = pb.start();
  76         p.waitFor();
  77         int exitValue = p.exitValue();
  78         if (exitValue != 0) {
  79             throw new Exception("jmap -heap exited with error code: " + exitValue);
  80         }
  81     }
  82 
  83     private static String read(File f) throws Exception {
  84         Path p = f.toPath();
  85         List<String> lines = Files.readAllLines(p, Charset.defaultCharset());
  86 
  87         StringBuilder sb = new StringBuilder();
  88         for (String line : lines) {
  89             sb.append(line).append('\n');
  90         }
  91         return sb.toString();
  92     }
  93 }