1 /*
  2  * Copyright (c) 2017, 2023, 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 
 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, "-XX:-PreloadSharedClasses");
 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 }