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/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @summary Test that a hidden class has the same module as its lookup class.
* @library /test/lib
* @modules jdk.compiler
* @compile pkg/HasNamedModule.java
* @run main/othervm HiddenGetModule
*/
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.lang.invoke.MethodType;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodHandles.Lookup;
import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
import java.io.IOException;
import java.lang.ModuleLayer;
import java.lang.module.Configuration;
import java.lang.module.ModuleDescriptor;
import java.lang.module.ModuleFinder;
import java.lang.module.ModuleReader;
import java.lang.module.ModuleReference;
import java.lang.reflect.Method;
import java.net.URI;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import jdk.test.lib.compiler.InMemoryJavaCompiler;
public class HiddenGetModule {
static byte unnamedKlassbuf[] = InMemoryJavaCompiler.compile("TestClass",
"public class TestClass { " +
" public static void concat(String one, String two) throws Throwable { " +
" System.out.println(one + two);" +
" } } ");
public static ModuleFinder finderOf(ModuleDescriptor... descriptors) {
// Create a ModuleReference for each module
Map<String, ModuleReference> namesToReference = new HashMap<>();
for (ModuleDescriptor descriptor : descriptors) {
String name = descriptor.name();
URI uri = URI.create("module:/" + name);
ModuleReference mref = new ModuleReference(descriptor, uri) {
@Override
public ModuleReader open() {
throw new UnsupportedOperationException();
}
};
namesToReference.put(name, mref);
}
return new ModuleFinder() {
@Override
public Optional<ModuleReference> find(String name) {
Objects.requireNonNull(name);
return Optional.ofNullable(namesToReference.get(name));
}
@Override
public Set<ModuleReference> findAll() {
return new HashSet<>(namesToReference.values());
}
};
}
public static void main(String[] args) throws Throwable {
// Test unnamed module.
Lookup lookup = MethodHandles.lookup();
Class<?> cl = lookup.defineHiddenClass(unnamedKlassbuf, false, NESTMATE).lookupClass();
if (cl.getModule() != HiddenGetModule.class.getModule()) {
throw new RuntimeException("hidden class and lookup class have different unnamed modules");
}
// Test named module.
MyClassLoader myClassLoader = new MyClassLoader();
// Define a module named HiddenModule containing package pkg.
ModuleDescriptor descriptor = ModuleDescriptor.newModule("HiddenModule")
.requires("java.base")
.exports("pkg")
.build();
// Set up a ModuleFinder containing the module for this layer.
ModuleFinder finder = finderOf(descriptor);
// Resolves "HiddenModule"
Configuration cf = ModuleLayer.boot()
.configuration()
.resolve(finder, ModuleFinder.of(), Set.of("HiddenModule"));
// map module to class loader
Map<String, ClassLoader> map = new HashMap<>();
map.put("HiddenModule", myClassLoader);
// Create layer that contains HiddenModule
ModuleLayer layer = ModuleLayer.boot().defineModules(cf, map::get);
byte klassbuf[] = InMemoryJavaCompiler.compile("pkg.TestClass",
"package pkg; " +
"public class TestClass { " +
" public static void concat(String one, String two) throws Throwable { " +
" System.out.println(one + two);" +
" } } ");
// Load the class and call the method that defines a hidden class and compares modules.
Class<?>c = Class.forName("pkg.HasNamedModule", true, myClassLoader);
if (c.getClassLoader() != myClassLoader) {
throw new RuntimeException("pkg.HasNamedModule defined by wrong classloader: " + c.getClassLoader());
}
Method m = c.getDeclaredMethod("compareModules", byte[].class);
m.invoke(null, klassbuf);
}
public static class MyClassLoader extends ClassLoader {
public static final String CLASS_NAME = "HasNamedModule";
static ByteBuffer readClassFile(String name) {
File f = new File(System.getProperty("test.classes", "."), name);
try (FileInputStream fin = new FileInputStream(f);
FileChannel fc = fin.getChannel()) {
return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
} catch (IOException e) {
throw new RuntimeException("Can't open file: " + name + ", " + e.toString());
}
}
protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
Class<?> c;
if (!name.contains(CLASS_NAME)) {
c = super.loadClass(name, resolve);
} else {
// should not delegate to the system class loader
c = findClass(name);
if (resolve) {
resolveClass(c);
}
}
return c;
}
protected Class<?> findClass(String name) throws ClassNotFoundException {
if (!name.contains(CLASS_NAME)) {
throw new ClassNotFoundException("Unexpected class: " + name);
}
return defineClass(name, readClassFile(name.replace(".", File.separator) + ".class"), null);
}
} /* MyClassLoader */
}
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