1 /*
   2  * Copyright (c) 2013, 2020, 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 package gc.metaspace;
  25 
  26 /**
  27  * @test CompressedClassSpaceSizeInJmapHeap
  28  * @bug 8004924
  29  * @summary Checks that jmap -heap contains the flag CompressedClassSpaceSize
  30  * @requires vm.hasSA
  31  * @requires vm.bits == 64 & vm.opt.final.UseCompressedOops == true
  32  * @library /test/lib
  33  * @modules java.base/jdk.internal.misc
  34  *          java.management
  35  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:CompressedClassSpaceSize=50m gc.metaspace.CompressedClassSpaceSizeInJmapHeap
  36  */
  37 
  38 import jdk.test.lib.JDKToolLauncher;
  39 import jdk.test.lib.Platform;
  40 import jdk.test.lib.process.OutputAnalyzer;
  41 import jdk.test.lib.process.ProcessTools;
  42 import jdk.test.lib.SA.SATestUtils;
  43 import java.nio.file.*;
  44 import java.io.File;
  45 import java.nio.charset.Charset;
  46 import java.util.List;
  47 
  48 public class CompressedClassSpaceSizeInJmapHeap {
  49     // Note that on some platforms it may require root privileges to run this test.
  50     public static void main(String[] args) throws Exception {
  51         SATestUtils.skipIfCannotAttach(); // throws SkippedException if attach not expected to work.
  52 
  53         if (!Platform.is64bit()) {
  54             // Compressed Class Space is only available on 64-bit JVMs
  55             return;
  56         }
  57 
  58         String pid = Long.toString(ProcessTools.getProcessId());
  59 
  60         JDKToolLauncher jmap = JDKToolLauncher.create("jhsdb")
  61                                               .addToolArg("jmap")
  62                                               .addToolArg("--heap")
  63                                               .addToolArg("--pid")
  64                                               .addToolArg(pid);
  65         ProcessBuilder pb = SATestUtils.createProcessBuilder(jmap);
  66 
  67         File out = new File("CompressedClassSpaceSizeInJmapHeap.stdout.txt");
  68         pb.redirectOutput(out);
  69 
  70         File err = new File("CompressedClassSpaceSizeInJmapHeap.stderr.txt");
  71         pb.redirectError(err);
  72 
  73         run(pb);
  74 
  75         OutputAnalyzer output = new OutputAnalyzer(read(out));
  76         output.shouldContain("CompressedClassSpaceSize = 52428800 (50.0MB)");
  77         out.delete();
  78     }
  79 
  80     private static void run(ProcessBuilder pb) throws Exception {
  81         Process p = pb.start();
  82         p.waitFor();
  83         int exitValue = p.exitValue();
  84         if (exitValue != 0) {
  85             throw new Exception("jmap -heap exited with error code: " + exitValue);
  86         }
  87     }
  88 
  89     private static String read(File f) throws Exception {
  90         Path p = f.toPath();
  91         List<String> lines = Files.readAllLines(p, Charset.defaultCharset());
  92 
  93         StringBuilder sb = new StringBuilder();
  94         for (String line : lines) {
  95             sb.append(line).append('\n');
  96         }
  97         return sb.toString();
  98     }
  99 }