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 /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.management 31 */ 32 33 import jdk.test.lib.process.ProcessTools; 34 import jdk.test.lib.process.OutputAnalyzer; 35 import jdk.test.lib.Platform; 36 37 public class CdsSameObjectAlignment { 38 public static void main(String[] args) throws Exception { 39 String nativeWordSize = System.getProperty("sun.arch.data.model"); 40 if (!Platform.is64bit()) { 41 System.out.println("ObjectAlignmentInBytes for CDS is only " + 42 "supported on 64bit platforms; this plaform is " + 43 nativeWordSize); 44 System.out.println("Skipping the test"); 45 } else { 46 dumpAndLoadSharedArchive(8); 47 dumpAndLoadSharedArchive(16); 48 dumpAndLoadSharedArchive(32); 49 dumpAndLoadSharedArchive(64); 50 } 51 } 52 53 private static void 54 dumpAndLoadSharedArchive(int objectAlignmentInBytes) throws Exception { 55 String objectAlignmentArg = "-XX:ObjectAlignmentInBytes=" 56 + objectAlignmentInBytes; 57 System.out.println("dumpAndLoadSharedArchive(): objectAlignmentInBytes = " 58 + objectAlignmentInBytes); 59 60 String filename = "./CdsSameObjectAlignment" + objectAlignmentInBytes + ".jsa"; 61 // create shared archive 62 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( 63 "-XX:+UnlockDiagnosticVMOptions", 64 "-XX:SharedArchiveFile=" + filename, 65 "-Xshare:dump", 66 objectAlignmentArg); 67 68 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 69 output.shouldContain("Loading classes to share"); 70 output.shouldHaveExitValue(0); 71 72 73 // run using the shared archive 74 pb = ProcessTools.createJavaProcessBuilder( 75 "-XX:+UnlockDiagnosticVMOptions", 76 "-XX:SharedArchiveFile=" + filename, 77 "-Xshare:on", 78 objectAlignmentArg, 79 "-version"); 80 81 output = new OutputAnalyzer(pb.start()); 82 83 try { 84 output.shouldContain("sharing"); 85 output.shouldHaveExitValue(0); 86 } catch (RuntimeException e) { 87 // CDS uses absolute addresses for performance. 88 // It will try to reserve memory at a specific address; 89 // there is a chance such reservation will fail 90 // If it does, it is NOT considered a failure of the feature, 91 // rather a possible expected outcome, though not likely 92 output.shouldContain("Unable to use shared archive"); 93 output.shouldHaveExitValue(1); 94 } 95 } 96 }