1 /* 2 * Copyright (c) 2017, 2019, 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 /* 26 * @test 27 * @summary Unused metadata created during dump time should be freed from the CDS archive. 28 * @requires vm.cds 29 * @library /test/lib 30 * @compile test-classes/MethodNoReturn.jasm test-classes/Hello.java 31 * @run driver FreeUnusedMetadata 32 */ 33 34 import java.nio.file.Files; 35 import java.nio.file.Paths; 36 import jdk.test.lib.process.OutputAnalyzer; 37 38 public class FreeUnusedMetadata { 39 static byte iconst_1 = 4; 40 static byte pop = 87; 41 static byte[] pattern = { // This has the same sequence as in test-classes/MethodNoReturn.jasm 42 iconst_1, 43 pop, 44 iconst_1, 45 pop, 46 iconst_1, 47 pop, 48 iconst_1, 49 pop, 50 iconst_1, 51 pop, 52 iconst_1, 53 pop, 54 iconst_1, 55 pop, 56 iconst_1, 57 pop, 58 iconst_1, 59 pop, 60 iconst_1, 61 pop, 62 iconst_1, 63 iconst_1, 64 iconst_1, 65 iconst_1, 66 iconst_1, 67 iconst_1, 68 iconst_1, 69 iconst_1, 70 pop, 71 pop, 72 pop, 73 pop, 74 pop, 75 pop, 76 pop, 77 pop 78 }; 79 main(String[] args)80 public static void main(String[] args) throws Exception { 81 String[] ARCHIVE_CLASSES = {"Hello", "MethodNoReturn"}; 82 String appJar = JarBuilder.build("FreeUnusedMetadata", ARCHIVE_CLASSES); 83 84 OutputAnalyzer dumpOutput = TestCommon.dump( 85 appJar, ARCHIVE_CLASSES); 86 TestCommon.checkDump(dumpOutput, "Loading classes to share"); 87 88 OutputAnalyzer execOutput = TestCommon.exec(appJar, "Hello"); 89 TestCommon.checkExec(execOutput, "Hello World"); 90 91 92 String archive = TestCommon.getCurrentArchiveName(); 93 System.out.println("Checking for pattern inside " + archive + "..."); 94 95 byte[] data = Files.readAllBytes(Paths.get(archive)); 96 int max = data.length - pattern.length; 97 for (int i=0; i<max; i++) { 98 if (data[i+0] == iconst_1 && data[i+1] == pop && 99 data[i+2] == iconst_1 && data[i+3] == pop) { 100 boolean match = true; 101 for (int x=4; x<pattern.length; x++) { 102 if (data[i+x] != pattern[x]) { 103 match = false; 104 break; 105 } 106 } 107 108 if (match) { 109 throw new RuntimeException("method of unverifiable class should have been " + 110 "removed from the archive " + archive + 111 " , but was found at offset " + i); 112 } 113 } 114 } 115 System.out.println("Not found: method from unverifiable class has been removed"); 116 } 117 } 118