1 /*
   2  * Copyright (c) 2013, 2015, 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 /testlibrary
  29  */
  30 
  31 import com.oracle.java.testlibrary.*;
  32 
  33 public class CdsSameObjectAlignment {
  34     public static void main(String[] args) throws Exception {
  35         String nativeWordSize = System.getProperty("sun.arch.data.model");
  36         if (!Platform.is64bit()) {
  37             System.out.println("ObjectAlignmentInBytes for CDS is only " +
  38                 "supported on 64bit platforms; this plaform is " +
  39                 nativeWordSize);
  40             System.out.println("Skipping the test");
  41         } else {
  42             dumpAndLoadSharedArchive(8);
  43             dumpAndLoadSharedArchive(16);
  44             dumpAndLoadSharedArchive(32);
  45             dumpAndLoadSharedArchive(64);
  46         }
  47     }
  48 
  49     private static void
  50     dumpAndLoadSharedArchive(int objectAlignmentInBytes) throws Exception {
  51         String objectAlignmentArg = "-XX:ObjectAlignmentInBytes="
  52             + objectAlignmentInBytes;
  53         System.out.println("dumpAndLoadSharedArchive(): objectAlignmentInBytes = "
  54             + objectAlignmentInBytes);
  55 
  56         String filename = "./CdsSameObjectAlignment" + objectAlignmentInBytes + ".jsa";
  57         // create shared archive
  58         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  59             "-XX:+UnlockDiagnosticVMOptions",
  60             "-XX:SharedArchiveFile=" + filename,
  61             "-Xshare:dump",
  62             objectAlignmentArg);
  63 
  64         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  65         output.shouldContain("Loading classes to share");
  66         output.shouldHaveExitValue(0);
  67 
  68 
  69         // run using the shared archive
  70         pb = ProcessTools.createJavaProcessBuilder(
  71             "-XX:+UnlockDiagnosticVMOptions",
  72             "-XX:SharedArchiveFile=" + filename,
  73             "-Xshare:on",
  74             objectAlignmentArg,
  75             "-version");
  76 
  77         output = new OutputAnalyzer(pb.start());
  78 
  79         try {
  80             output.shouldContain("sharing");
  81             output.shouldHaveExitValue(0);
  82         } catch (RuntimeException e) {
  83             // CDS uses absolute addresses for performance.
  84             // It will try to reserve memory at a specific address;
  85             // there is a chance such reservation will fail
  86             // If it does, it is NOT considered a failure of the feature,
  87             // rather a possible expected outcome, though not likely
  88             output.shouldContain("Unable to use shared archive");
  89             output.shouldHaveExitValue(1);
  90         }
  91     }
  92 }