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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
/**
* Class loader test.
*/
public class Main {
/**
* Thrown when an unexpected Exception is caught internally.
*/
static class TestFailed extends Exception {
public TestFailed(Throwable cause) {
super(cause);
}
}
/**
* A class loader which loads classes from the dex file
* "test.jar". However, it will return null when asked to load the
* class InaccessibleSuper.
*
* When testing code calls BrokenDexLoader's findBrokenClass(),
* a BrokenDexLoader will be the defining loader for the class
* Inaccessible. The VM will call the defining loader for
* "InaccessibleSuper", which will return null, which the VM
* should be able to deal with gracefully.
*
* Note that this depends heavily on the Dalvik test harness.
*/
static class BrokenDexLoader extends ClassLoader {
/** We return null when asked to load InaccessibleSuper. */
private static class InaccessibleSuper {}
private static class Inaccessible extends InaccessibleSuper {}
private static final String SUPERCLASS_NAME =
"Main$BrokenDexLoader$InaccessibleSuper";
private static final String CLASS_NAME =
"Main$BrokenDexLoader$Inaccessible";
private static final String DEX_FILE = "test.jar";
public BrokenDexLoader(ClassLoader parent) {
super(parent);
}
/**
* Finds the class with the specified binary name, from DEX_FILE.
*
* If we don't find a match, we throw an exception.
*/
private Class<?> findDexClass(String name)
throws TestFailed, InvocationTargetException
{
try {
/*
* Find the DexFile class, and construct a DexFile object
* through reflection, then call loadCLass on it.
*/
Class mDexClass = ClassLoader.getSystemClassLoader().
loadClass("dalvik/system/DexFile");
Constructor ctor = mDexClass.
getConstructor(new Class[] {String.class});
Object mDexFile = ctor.newInstance(DEX_FILE);
Method meth = mDexClass.
getMethod("loadClass",
new Class[] { String.class, ClassLoader.class });
/*
* Invoking loadClass on CLASS_NAME is expected to
* throw an InvocationTargetException. Anything else
* is an error we can't recover from.
*/
meth.invoke(mDexFile, name, this);
} catch (NoSuchMethodException nsme) {
throw new TestFailed(nsme);
} catch (InstantiationException ie) {
throw new TestFailed(ie);
} catch (IllegalAccessException iae) {
throw new TestFailed(iae);
} catch (ClassNotFoundException cnfe) {
throw new TestFailed(cnfe);
}
return null;
}
/**
* Load a class.
*
* Return null if the class's name is SUPERCLASS_NAME;
* otherwise invoke the super's loadClass method.
*/
public Class<?> loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
if (SUPERCLASS_NAME.equals(name)) {
return null;
}
return super.loadClass(name, resolve);
}
/**
* Attempt to find the class with the superclass we refuse to
* load. This is expected to throw an
* InvocationTargetException, with a NullPointerException as
* its cause.
*/
public void findBrokenClass()
throws TestFailed, InvocationTargetException
{
findDexClass(CLASS_NAME);
}
}
/**
* Main entry point.
*/
public static void main(String[] args)
throws TestFailed, ClassNotFoundException {
/*
* Run test.
*/
testFailLoadAndGc();
}
/**
* See if we can GC after a failed load.
*/
static void testFailLoadAndGc() throws TestFailed {
try {
BrokenDexLoader loader;
loader = new BrokenDexLoader(ClassLoader.getSystemClassLoader());
loader.findBrokenClass();
System.err.println("ERROR: Inaccessible was accessible");
} catch (InvocationTargetException ite) {
Throwable cause = ite.getCause();
if (cause instanceof NullPointerException) {
System.err.println("Got expected ITE/NPE");
} else {
System.err.println("Got unexpected ITE");
ite.printStackTrace();
}
}
}
}
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