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