1 /*
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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
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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
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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 main 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 
main(String[] args)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 }
119