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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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  * @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