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