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  * @modules jdk.jartool/sun.tools.jar

    31  * @compile test-classes/MethodNoReturn.jasm test-classes/Hello.java

    32  * @run driver FreeUnusedMetadata

    33  */

    34 

    35 import java.nio.file.Files;

    36 import java.nio.file.Paths;

    37 import jdk.test.lib.process.OutputAnalyzer;

    38 

    39 public class FreeUnusedMetadata {

    40     static byte iconst_1 =  4;

    41     static byte pop      = 87;

    42     static byte[] pattern = { // This has the same sequence as in test-classes/MethodNoReturn.jasm

    43         iconst_1,

    44         pop,

    45         iconst_1,

    46         pop,

    47         iconst_1,

    48         pop,

    49         iconst_1,

    50         pop,

    51         iconst_1,

    52         pop,

    53         iconst_1,

    54         pop,

    55         iconst_1,

    56         pop,

    57         iconst_1,

    58         pop,

    59         iconst_1,

    60         pop,

    61         iconst_1,

    62         pop,

    63         iconst_1,

    64         iconst_1,

    65         iconst_1,

    66         iconst_1,

    67         iconst_1,

    68         iconst_1,

    69         iconst_1,

    70         iconst_1,

    71         pop,

    72         pop,

    73         pop,

    74         pop,

    75         pop,

    76         pop,

    77         pop,

    78         pop

    79     };

    80 

    81     public static void main(String[] args) throws Exception {

    82         String[] ARCHIVE_CLASSES = {"Hello", "MethodNoReturn"};

    83         String appJar = JarBuilder.build("FreeUnusedMetadata", ARCHIVE_CLASSES);

    84 

    85         OutputAnalyzer dumpOutput = TestCommon.dump(

    86                 appJar, ARCHIVE_CLASSES);

    87         TestCommon.checkDump(dumpOutput, "Loading classes to share");

    88 

    89         OutputAnalyzer execOutput = TestCommon.exec(appJar, "Hello");

    90         TestCommon.checkExec(execOutput, "Hello World");

    91 

    92 

    93         String archive = TestCommon.getCurrentArchiveName();

    94         System.out.println("Checking for pattern inside " + archive + "...");

    95 

    96         byte[] data = Files.readAllBytes(Paths.get(archive));

    97         int max = data.length - pattern.length;

    98         for (int i=0; i<max; i++) {

    99             if (data[i+0] == iconst_1 && data[i+1] == pop &&

   100                 data[i+2] == iconst_1 && data[i+3] == pop) {

   101                 boolean match = true;

   102                 for (int x=4; x<pattern.length; x++) {

   103                     if (data[i+x] != pattern[x]) {

   104                         match = false;

   105                         break;

   106                     }

   107                 }

   108 

   109                 if (match) {

   110                     throw new RuntimeException("method of unverifiable class should have been " +

   111                         "removed from the archive " + archive +

   112                         " , but was found at offset " + i);

   113                 }

   114             }

   115         }

   116         System.out.println("Not found: method from unverifiable class has been removed");

   117     }

   118 }