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 /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 }