1 /*
   2  * Copyright (c) 2013, 2016, 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 CdsSameObjectAlignment
  26  * @summary Testing CDS (class data sharing) using varying object alignment.
  27  *          Using same object alignment for each dump/load pair
  28  * @library /test/lib
  29  * @modules java.base/jdk.internal.misc
  30  *          java.management
  31  */
  32 
  33 import jdk.test.lib.process.ProcessTools;
  34 import jdk.test.lib.process.OutputAnalyzer;
  35 import jdk.test.lib.Platform;
  36 
  37 public class CdsSameObjectAlignment {
  38     public static void main(String[] args) throws Exception {
  39         String nativeWordSize = System.getProperty("sun.arch.data.model");
  40         if (!Platform.is64bit()) {
  41             System.out.println("ObjectAlignmentInBytes for CDS is only " +
  42                 "supported on 64bit platforms; this plaform is " +
  43                 nativeWordSize);
  44             System.out.println("Skipping the test");
  45         } else {
  46             dumpAndLoadSharedArchive(8);
  47             dumpAndLoadSharedArchive(16);
  48             dumpAndLoadSharedArchive(32);
  49             dumpAndLoadSharedArchive(64);
  50         }
  51     }
  52 
  53     private static void
  54     dumpAndLoadSharedArchive(int objectAlignmentInBytes) throws Exception {
  55         String objectAlignmentArg = "-XX:ObjectAlignmentInBytes="
  56             + objectAlignmentInBytes;
  57         System.out.println("dumpAndLoadSharedArchive(): objectAlignmentInBytes = "
  58             + objectAlignmentInBytes);
  59 
  60         String filename = "./CdsSameObjectAlignment" + objectAlignmentInBytes + ".jsa";
  61         // create shared archive
  62         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  63             "-XX:+UnlockDiagnosticVMOptions",
  64             "-XX:SharedArchiveFile=" + filename,
  65             "-Xshare:dump",
  66             objectAlignmentArg);
  67 
  68         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  69         output.shouldContain("Loading classes to share");
  70         output.shouldHaveExitValue(0);
  71 
  72 
  73         // run using the shared archive
  74         pb = ProcessTools.createJavaProcessBuilder(
  75             "-XX:+UnlockDiagnosticVMOptions",
  76             "-XX:SharedArchiveFile=" + filename,
  77             "-Xshare:on",
  78             objectAlignmentArg,
  79             "-version");
  80 
  81         output = new OutputAnalyzer(pb.start());
  82 
  83         try {
  84             output.shouldContain("sharing");
  85             output.shouldHaveExitValue(0);
  86         } catch (RuntimeException e) {
  87             // CDS uses absolute addresses for performance.
  88             // It will try to reserve memory at a specific address;
  89             // there is a chance such reservation will fail
  90             // If it does, it is NOT considered a failure of the feature,
  91             // rather a possible expected outcome, though not likely
  92             output.shouldContain("Unable to use shared archive");
  93             output.shouldHaveExitValue(1);
  94         }
  95     }
  96 }