1 /*
2 * Copyright (c) 2022, 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 * @test
26 * @bug 8281323
27 * @summary Check emission of LoadableDescriptors attribute to make sure javac does not emit unneeded entries.
28 * @modules jdk.jdeps/com.sun.tools.classfile
29 * @enablePreview
30 * @run main NoUnnecessaryLoadableDescriptorsTest
31 */
32
33 import com.sun.tools.classfile.*;
34 import com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info;
35
36 public class NoUnnecessaryLoadableDescriptorsTest {
37
38 public value class LoadableDescriptorsTest1 {
39 byte b;
40 public LoadableDescriptorsTest1(byte b) {
41 this.b = b;
42 }
43 }
44
45 public class LoadableDescriptorsTest2 {
46 static class Inner1 {
47 static value class Inner2 {}
48 Inner2 inner;
49 }
50 }
51
52 public static void main(String[] args) throws Exception {
53
54 // There should be no LoadableDescriptors attribute in NoUnnecessaryLoadableDescriptorsTest.class
55 ClassFile cls = ClassFile.read(NoUnnecessaryLoadableDescriptorsTest.class.getResourceAsStream("NoUnnecessaryLoadableDescriptorsTest.class"));
56
57 if (cls == null) {
58 throw new AssertionError("Could not locate the class files");
59 }
60
61 /* Check emission of LoadableDescriptors attribute */
62 LoadableDescriptors_attribute LoadableDescriptors = (LoadableDescriptors_attribute) cls.attributes.get(Attribute.LoadableDescriptors);
63 if (LoadableDescriptors != null) {
64 throw new AssertionError("Unexpected LoadableDescriptors attribute!");
65 }
66
67 // There should be no LoadableDescriptors attribute in NoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest1.class
68 cls = ClassFile.read(NoUnnecessaryLoadableDescriptorsTest.class.getResourceAsStream("NoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest1.class"));
69
70 if (cls == null) {
71 throw new AssertionError("Could not locate the class files");
72 }
73
74 /* Check emission of LoadableDescriptors attribute */
75 LoadableDescriptors = (LoadableDescriptors_attribute) cls.attributes.get(Attribute.LoadableDescriptors);
76 if (LoadableDescriptors != null) {
77 throw new AssertionError("Unexpected LoadableDescriptors attribute!");
78 }
79
80 // There should be no LoadableDescriptors attribute in NoUnnecessaryLoadableDescriptorsTest$PreloadTest2.class
81 cls = ClassFile.read(NoUnnecessaryLoadableDescriptorsTest.class.getResourceAsStream("NoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest2.class"));
82
83 if (cls == null) {
84 throw new AssertionError("Could not locate the class files");
85 }
86
87 /* Check emission of LoadableDescriptors attribute */
88 LoadableDescriptors = (LoadableDescriptors_attribute) cls.attributes.get(Attribute.LoadableDescriptors);
89 if (LoadableDescriptors != null) {
90 throw new AssertionError("Unexpected LoadableDescriptors attribute!");
91 }
92
93 // There should be no LoadableDescriptors attribute in NoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest2$Inner2.class
94 cls = ClassFile.read(NoUnnecessaryLoadableDescriptorsTest.class.getResourceAsStream("NoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest2$Inner1$Inner2.class"));
95
96 if (cls == null) {
97 throw new AssertionError("Could not locate the class files");
98 }
99
100 /* Check emission of LoadableDescriptors attribute */
101 LoadableDescriptors = (LoadableDescriptors_attribute) cls.attributes.get(Attribute.LoadableDescriptors);
102 if (LoadableDescriptors != null) {
103 throw new AssertionError("Unexpected LoadableDescriptors attribute!");
104 }
105
106 // There should be ONE LoadableDescriptors attribute entry in NoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest2$Inner1.class
107 cls = ClassFile.read(NoUnnecessaryLoadableDescriptorsTest.class.getResourceAsStream("NoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest2$Inner1.class"));
108
109 if (cls == null) {
110 throw new AssertionError("Could not locate the class files");
111 }
112
113 /* Check emission of LoadableDescriptors attribute */
114 LoadableDescriptors = (LoadableDescriptors_attribute) cls.attributes.get(Attribute.LoadableDescriptors);
115 if (LoadableDescriptors == null) {
116 throw new AssertionError("Missing LoadableDescriptors attribute!");
117 }
118
119 if (LoadableDescriptors.number_of_descriptors != 1) {
120 throw new AssertionError("Incorrect number of LoadableDescriptors classes");
121 }
122
123 CONSTANT_Utf8_info utf8Info = cls.constant_pool.getUTF8Info(LoadableDescriptors.descriptors[0]);
124 System.err.println("utf8 " + utf8Info.value);
125 if (!utf8Info.value.equals("LNoUnnecessaryLoadableDescriptorsTest$LoadableDescriptorsTest2$Inner1$Inner2;")) {
126 throw new AssertionError("Expected LoadableDescriptors class entry is missing, but found " + utf8Info.value);
127 }
128 }
129 }