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DefineClassTest.java
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DefineClassTest.java
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/*
* Copyright (c) 2017, 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
* @modules java.base/java.lang:open
* java.base/jdk.internal.org.objectweb.asm
* @run testng/othervm test.DefineClassTest
* @summary Basic test for java.lang.invoke.MethodHandles.Lookup.defineClass
*/
package test;
import java.lang.invoke.MethodHandles.Lookup;
import static java.lang.invoke.MethodHandles.*;
import static java.lang.invoke.MethodHandles.Lookup.*;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import static jdk.internal.org.objectweb.asm.Opcodes.*;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
public class DefineClassTest {
private static final String THIS_PACKAGE = DefineClassTest.class.getPackageName();
/**
* Test that a class has the same class loader, and is in the same package and
* protection domain, as a lookup class.
*/
void testSameAbode(Class<?> clazz, Class<?> lc) {
assertTrue(clazz.getClassLoader() == lc.getClassLoader());
assertEquals(clazz.getPackageName(), lc.getPackageName());
assertTrue(clazz.getProtectionDomain() == lc.getProtectionDomain());
}
/**
* Tests that a class is discoverable by name using Class.forName and
* lookup.findClass
*/
void testDiscoverable(Class<?> clazz, Lookup lookup) throws Exception {
String cn = clazz.getName();
ClassLoader loader = clazz.getClassLoader();
assertTrue(Class.forName(cn, false, loader) == clazz);
assertTrue(lookup.findClass(cn) == clazz);
}
/**
* Basic test of defineClass to define a class in the same package as test.
*/
@Test
public void testDefineClass() throws Exception {
final String CLASS_NAME = THIS_PACKAGE + ".Foo";
Lookup lookup = lookup();
Class<?> clazz = lookup.defineClass(generateClass(CLASS_NAME));
// test name
assertEquals(clazz.getName(), CLASS_NAME);
// test loader/package/protection-domain
testSameAbode(clazz, lookup.lookupClass());
// test discoverable
testDiscoverable(clazz, lookup);
// attempt defineClass again
try {
lookup.defineClass(generateClass(CLASS_NAME));
assertTrue(false);
} catch (LinkageError expected) { }
}
/**
* Test public/package/protected/private access from class defined with defineClass.
*/
@Test
public void testAccess() throws Exception {
final String THIS_CLASS = this.getClass().getName();
final String CLASS_NAME = THIS_PACKAGE + ".Runner";
Lookup lookup = lookup();
// public
byte[] classBytes = generateRunner(CLASS_NAME + nextNumber(), THIS_CLASS, "method1");
testInvoke(lookup.defineClass(classBytes));
// package
classBytes = generateRunner(CLASS_NAME + nextNumber(), THIS_CLASS, "method2");
testInvoke(lookup.defineClass(classBytes));
// protected (same package)
classBytes = generateRunner(CLASS_NAME + nextNumber(), THIS_CLASS, "method3");
testInvoke(lookup.defineClass(classBytes));
// private
classBytes = generateRunner(CLASS_NAME + nextNumber(), THIS_CLASS, "method4");
Class<?> clazz = lookup.defineClass(classBytes);
Runnable r = (Runnable) clazz.newInstance();
try {
r.run();
assertTrue(false);
} catch (IllegalAccessError expected) { }
}
public static void method1() { }
static void method2() { }
protected static void method3() { }
private static void method4() { }
void testInvoke(Class<?> clazz) throws Exception {
Object obj = clazz.newInstance();
((Runnable) obj).run();
}
/**
* Test that defineClass does not run the class initializer
*/
@Test
public void testInitializerNotRun() throws Exception {
final String THIS_CLASS = this.getClass().getName();
final String CLASS_NAME = THIS_PACKAGE + ".ClassWithClinit";
byte[] classBytes = generateClassWithInitializer(CLASS_NAME, THIS_CLASS, "fail");
Class<?> clazz = lookup().defineClass(classBytes);
// trigger initializer to run
try {
clazz.newInstance();
assertTrue(false);
} catch (ExceptionInInitializerError e) {
assertTrue(e.getCause() instanceof IllegalCallerException);
}
}
static void fail() { throw new IllegalCallerException(); }
/**
* Test defineClass to define classes in a package containing classes with
* different protection domains.
*/
@Test
public void testTwoProtectionDomains() throws Exception {
Path here = Paths.get("");
// p.C1 in one exploded directory
Path dir1 = Files.createTempDirectory(here, "classes");
Path p = Files.createDirectory(dir1.resolve("p"));
Files.write(p.resolve("C1.class"), generateClass("p.C1"));
URL url1 = dir1.toUri().toURL();
// p.C2 in another exploded directory
Path dir2 = Files.createTempDirectory(here, "classes");
p = Files.createDirectory(dir2.resolve("p"));
Files.write(p.resolve("C2.class"), generateClass("p.C2"));
URL url2 = dir2.toUri().toURL();
// load p.C1 and p.C2
ClassLoader loader = new URLClassLoader(new URL[] { url1, url2 });
Class<?> target1 = Class.forName("p.C1", false, loader);
Class<?> target2 = Class.forName("p.C2", false, loader);
assertTrue(target1.getClassLoader() == loader);
assertTrue(target1.getClassLoader() == loader);
assertNotEquals(target1.getProtectionDomain(), target2.getProtectionDomain());
// protection domain 1
Lookup lookup1 = privateLookupIn(target1, lookup());
Class<?> clazz = lookup1.defineClass(generateClass("p.Foo"));
testSameAbode(clazz, lookup1.lookupClass());
testDiscoverable(clazz, lookup1);
// protection domain 2
Lookup lookup2 = privateLookupIn(target2, lookup());
clazz = lookup2.defineClass(generateClass("p.Bar"));
testSameAbode(clazz, lookup2.lookupClass());
testDiscoverable(clazz, lookup2);
}
/**
* Test defineClass defining a class to the boot loader
*/
@Test
public void testBootLoader() throws Exception {
Lookup lookup = privateLookupIn(Thread.class, lookup());
assertTrue(lookup.getClass().getClassLoader() == null);
Class<?> clazz = lookup.defineClass(generateClass("java.lang.Foo"));
assertEquals(clazz.getName(), "java.lang.Foo");
testSameAbode(clazz, Thread.class);
testDiscoverable(clazz, lookup);
}
@Test(expectedExceptions = { IllegalArgumentException.class })
public void testWrongPackage() throws Exception {
lookup().defineClass(generateClass("other.C"));
}
@Test(expectedExceptions = { IllegalAccessException.class })
public void testNoPackageAccess() throws Exception {
Lookup lookup = lookup().dropLookupMode(PACKAGE);
lookup.defineClass(generateClass(THIS_PACKAGE + ".C"));
}
@Test(expectedExceptions = { ClassFormatError.class })
public void testTruncatedClassFile() throws Exception {
lookup().defineClass(new byte[0]);
}
@Test(expectedExceptions = { NullPointerException.class })
public void testNull() throws Exception {
lookup().defineClass(null);
}
/**
* Generates a class file with the given class name
*/
byte[] generateClass(String className) {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS
+ ClassWriter.COMPUTE_FRAMES);
cw.visit(V9,
ACC_PUBLIC + ACC_SUPER,
className.replace(".", "/"),
null,
"java/lang/Object",
null);
// <init>
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
/**
* Generate a class file with the given class name. The class implements Runnable
* with a run method to invokestatic the given targetClass/targetMethod.
*/
byte[] generateRunner(String className,
String targetClass,
String targetMethod) throws Exception {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS
+ ClassWriter.COMPUTE_FRAMES);
cw.visit(V9,
ACC_PUBLIC + ACC_SUPER,
className.replace(".", "/"),
null,
"java/lang/Object",
new String[] { "java/lang/Runnable" });
// <init>
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
// run()
String tc = targetClass.replace(".", "/");
mv = cw.visitMethod(ACC_PUBLIC, "run", "()V", null, null);
mv.visitMethodInsn(INVOKESTATIC, tc, targetMethod, "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
/**
* Generate a class file with the given class name. The class will initializer
* to invokestatic the given targetClass/targetMethod.
*/
byte[] generateClassWithInitializer(String className,
String targetClass,
String targetMethod) throws Exception {
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS
+ ClassWriter.COMPUTE_FRAMES);
cw.visit(V9,
ACC_PUBLIC + ACC_SUPER,
className.replace(".", "/"),
null,
"java/lang/Object",
null);
// <init>
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
// <clinit>
String tc = targetClass.replace(".", "/");
mv = cw.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
mv.visitMethodInsn(INVOKESTATIC, tc, targetMethod, "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
private int nextNumber() {
return ++nextNumber;
}
private int nextNumber;
}