1 /*
   2  * Copyright (c) 2014, 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
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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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  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8022865
  27  * @summary Tests for the -XX:ObjectAlignmentInBytes command line option
  28  * @library /test/lib
  29  * @modules java.base/jdk.internal.misc
  30  *          java.management
  31  * @run main ObjectAlignment
  32  */
  33 
  34 import jdk.test.lib.Platform;
  35 import jdk.test.lib.process.ProcessTools;
  36 import jdk.test.lib.process.OutputAnalyzer;
  37 
  38 public class ObjectAlignment {
  39 
  40     public static void main(String[] args) throws Exception {
  41 
  42         if (Platform.is64bit()) {
  43             // Minimum alignment should be 8
  44             testObjectAlignment(4)
  45                 .shouldContain("outside the allowed range")
  46                 .shouldHaveExitValue(1);
  47 
  48             // Alignment has to be a power of 2
  49             testObjectAlignment(9)
  50                 .shouldContain("must be power of 2")
  51                 .shouldHaveExitValue(1);
  52 
  53             testObjectAlignment(-1)
  54                 .shouldContain("outside the allowed range")
  55                 .shouldHaveExitValue(1);
  56 
  57             // Maximum alignment allowed is 256
  58             testObjectAlignment(512)
  59                 .shouldContain("outside the allowed range")
  60                 .shouldHaveExitValue(1);
  61 
  62             // Valid alignments should work
  63             testObjectAlignment(8).shouldHaveExitValue(0);
  64             testObjectAlignment(16).shouldHaveExitValue(0);
  65             testObjectAlignment(256).shouldHaveExitValue(0);
  66 
  67         } else {
  68             // For a 32bit JVM the option isn't there, make sure it's not silently ignored
  69             testObjectAlignment(8)
  70                 .shouldContain("Unrecognized VM option 'ObjectAlignmentInBytes=8'")
  71                 .shouldHaveExitValue(1);
  72         }
  73     }
  74 
  75     private static OutputAnalyzer testObjectAlignment(int alignment) throws Exception {
  76         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:ObjectAlignmentInBytes=" + alignment,
  77                                                                   "-version");
  78         return new OutputAnalyzer(pb.start());
  79     }
  80 }