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 CdsDifferentObjectAlignment
  26  * @summary Testing CDS (class data sharing) using varying object alignment.
  27  *          Using different object alignment for each dump/load pair.
  28  *          This is a negative test; using  object alignment for loading that
  29  *          is different from object alignment for creating a CDS file
  30  *          should fail when loading.
  31  * @library /test/lib
  32  * @bug 8025642
  33  * @modules java.base/jdk.internal.misc
  34  *          java.management
  35  */
  36 
  37 import jdk.test.lib.process.ProcessTools;
  38 import jdk.test.lib.process.OutputAnalyzer;
  39 import jdk.test.lib.Platform;
  40 
  41 public class CdsDifferentObjectAlignment {
  42     public static void main(String[] args) throws Exception {
  43         String nativeWordSize = System.getProperty("sun.arch.data.model");
  44         if (!Platform.is64bit()) {
  45             System.out.println("ObjectAlignmentInBytes for CDS is only " +
  46                 "supported on 64bit platforms; this plaform is " +
  47                 nativeWordSize);
  48             System.out.println("Skipping the test");
  49         } else {
  50             createAndLoadSharedArchive(16, 64);
  51             createAndLoadSharedArchive(64, 32);
  52         }
  53     }
  54 
  55 
  56     // Parameters are object alignment expressed in bytes
  57     private static void
  58     createAndLoadSharedArchive(int createAlignment, int loadAlignment)
  59     throws Exception {
  60         String createAlignmentArgument = "-XX:ObjectAlignmentInBytes=" +
  61             createAlignment;
  62         String loadAlignmentArgument = "-XX:ObjectAlignmentInBytes=" +
  63             loadAlignment;
  64         String filename = "./CdsDifferentObjectAlignment" + createAlignment + ".jsa";
  65 
  66         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  67             "-XX:+UnlockDiagnosticVMOptions",
  68             "-XX:SharedArchiveFile=" + filename,
  69             "-Xshare:dump",
  70             createAlignmentArgument);
  71 
  72         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  73         output.shouldContain("Loading classes to share");
  74         output.shouldHaveExitValue(0);
  75 
  76         pb = ProcessTools.createJavaProcessBuilder(
  77             "-XX:+UnlockDiagnosticVMOptions",
  78             "-XX:SharedArchiveFile=" + filename,
  79             "-Xshare:on",
  80             loadAlignmentArgument,
  81             "-version");
  82 
  83         output = new OutputAnalyzer(pb.start());
  84         String expectedErrorMsg =
  85             String.format(
  86             "The shared archive file's ObjectAlignmentInBytes of %d " +
  87             "does not equal the current ObjectAlignmentInBytes of %d",
  88             createAlignment,
  89             loadAlignment);
  90 
  91         try {
  92             output.shouldContain(expectedErrorMsg);
  93         } catch (RuntimeException e) {
  94             output.shouldContain("Unable to use shared archive");
  95         }
  96         output.shouldHaveExitValue(1);
  97     }
  98 }