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