1 /*
2 * Copyright (c) 2020, 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 * @summary Test that a hidden class has the same module as its lookup class.
27 * @library /test/lib
28 * @modules jdk.compiler
29 * @compile pkg/HasNamedModule.java
30 * @run main/othervm HiddenGetModule
31 */
32
33 import java.io.ByteArrayOutputStream;
34 import java.io.File;
35 import java.io.FileInputStream;
36 import java.lang.invoke.MethodType;
37 import java.lang.invoke.MethodHandles;
38 import java.lang.invoke.MethodHandles.Lookup;
39 import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
40 import java.io.IOException;
41 import java.lang.ModuleLayer;
42 import java.lang.module.Configuration;
43 import java.lang.module.ModuleDescriptor;
44 import java.lang.module.ModuleFinder;
45 import java.lang.module.ModuleReader;
46 import java.lang.module.ModuleReference;
47 import java.lang.reflect.Method;
48 import java.net.URI;
49 import java.nio.ByteBuffer;
50 import java.nio.channels.FileChannel;
51 import java.util.HashMap;
52 import java.util.HashSet;
53 import java.util.Map;
54 import java.util.Objects;
55 import java.util.Optional;
56 import java.util.Set;
57
58 import jdk.test.lib.compiler.InMemoryJavaCompiler;
59
60 public class HiddenGetModule {
61
62 static byte unnamedKlassbuf[] = InMemoryJavaCompiler.compile("TestClass",
63 "public class TestClass { " +
64 " public static void concat(String one, String two) throws Throwable { " +
65 " System.out.println(one + two);" +
66 " } } ");
67
68 public static ModuleFinder finderOf(ModuleDescriptor... descriptors) {
69
70 // Create a ModuleReference for each module
71 Map<String, ModuleReference> namesToReference = new HashMap<>();
72
73 for (ModuleDescriptor descriptor : descriptors) {
74 String name = descriptor.name();
75
76 URI uri = URI.create("module:/" + name);
77
78 ModuleReference mref = new ModuleReference(descriptor, uri) {
79 @Override
80 public ModuleReader open() {
81 throw new UnsupportedOperationException();
82 }
83 };
84
85 namesToReference.put(name, mref);
86 }
87
88 return new ModuleFinder() {
89 @Override
90 public Optional<ModuleReference> find(String name) {
91 Objects.requireNonNull(name);
92 return Optional.ofNullable(namesToReference.get(name));
93 }
94 @Override
95 public Set<ModuleReference> findAll() {
96 return new HashSet<>(namesToReference.values());
97 }
98 };
99 }
100
101 public static void main(String[] args) throws Throwable {
102
103 // Test unnamed module.
104 Lookup lookup = MethodHandles.lookup();
105 Class<?> cl = lookup.defineHiddenClass(unnamedKlassbuf, false, NESTMATE).lookupClass();
106 if (cl.getModule() != HiddenGetModule.class.getModule()) {
107 throw new RuntimeException("hidden class and lookup class have different unnamed modules");
108 }
109
110 // Test named module.
111 MyClassLoader myClassLoader = new MyClassLoader();
112
113 // Define a module named HiddenModule containing package pkg.
114 ModuleDescriptor descriptor = ModuleDescriptor.newModule("HiddenModule")
115 .requires("java.base")
116 .exports("pkg")
117 .build();
118
119 // Set up a ModuleFinder containing the module for this layer.
120 ModuleFinder finder = finderOf(descriptor);
121
122 // Resolves "HiddenModule"
123 Configuration cf = ModuleLayer.boot()
124 .configuration()
125 .resolve(finder, ModuleFinder.of(), Set.of("HiddenModule"));
126
127 // map module to class loader
128 Map<String, ClassLoader> map = new HashMap<>();
129 map.put("HiddenModule", myClassLoader);
130
131 // Create layer that contains HiddenModule
132 ModuleLayer layer = ModuleLayer.boot().defineModules(cf, map::get);
133
134 byte klassbuf[] = InMemoryJavaCompiler.compile("pkg.TestClass",
135 "package pkg; " +
136 "public class TestClass { " +
137 " public static void concat(String one, String two) throws Throwable { " +
138 " System.out.println(one + two);" +
139 " } } ");
140
141 // Load the class and call the method that defines a hidden class and compares modules.
142 Class<?>c = Class.forName("pkg.HasNamedModule", true, myClassLoader);
143 if (c.getClassLoader() != myClassLoader) {
144 throw new RuntimeException("pkg.HasNamedModule defined by wrong classloader: " + c.getClassLoader());
145 }
146 Method m = c.getDeclaredMethod("compareModules", byte[].class);
147 m.invoke(null, klassbuf);
148 }
149
150
151 public static class MyClassLoader extends ClassLoader {
152
153 public static final String CLASS_NAME = "HasNamedModule";
154
155 static ByteBuffer readClassFile(String name) {
156 File f = new File(System.getProperty("test.classes", "."), name);
157 try (FileInputStream fin = new FileInputStream(f);
158 FileChannel fc = fin.getChannel()) {
159 return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
160 } catch (IOException e) {
161 throw new RuntimeException("Can't open file: " + name + ", " + e.toString());
162 }
163 }
164
165 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
166 Class<?> c;
167 if (!name.contains(CLASS_NAME)) {
168 c = super.loadClass(name, resolve);
169 } else {
170 // should not delegate to the system class loader
171 c = findClass(name);
172 if (resolve) {
173 resolveClass(c);
174 }
175 }
176 return c;
177 }
178
179 protected Class<?> findClass(String name) throws ClassNotFoundException {
180 if (!name.contains(CLASS_NAME)) {
181 throw new ClassNotFoundException("Unexpected class: " + name);
182 }
183 return defineClass(name, readClassFile(name.replace(".", File.separator) + ".class"), null);
184 }
185 } /* MyClassLoader */
186
187 }