test/141-class-unload/src/Main.java - platform/art - Git at Google

 /*
  * Copyright (C) 2015 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.io.BufferedReader;
 import java.io.File;
 import java.io.FileReader;
 import java.lang.ref.WeakReference;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;

 public class Main {
     static final String DEX_FILE = System.getenv("DEX_LOCATION") + "/141-class-unload-ex.jar";
     static final String LIBRARY_SEARCH_PATH = System.getProperty("java.library.path");
     static String nativeLibraryName;

     public static void main(String[] args) throws Exception {
         nativeLibraryName = args[0];
         Class<?> pathClassLoader = Class.forName("dalvik.system.PathClassLoader");
         if (pathClassLoader == null) {
             throw new AssertionError("Couldn't find path class loader class");
         }
         Constructor<?> constructor =
             pathClassLoader.getDeclaredConstructor(String.class, String.class, ClassLoader.class);
         try {
             testUnloadClass(constructor);
             testUnloadLoader(constructor);
             // Test that we don't unload if we have an instance.
             testNoUnloadInstance(constructor);
             // Test JNI_OnLoad and JNI_OnUnload.
             testLoadAndUnloadLibrary(constructor);
             // Test that stack traces keep the classes live.
             testStackTrace(constructor);
             // Stress test to make sure we dont leak memory.
             stressTest(constructor);
             // Test that the oat files are unloaded.
             testOatFilesUnloaded(getPid());
             // Test that objects keep class loader live for sticky GC.
             testStickyUnload(constructor);
         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     private static void testOatFilesUnloaded(int pid) throws Exception {
         System.loadLibrary(nativeLibraryName);
         // Stop the JIT to ensure its threads and work queue are not keeping classes
         // artifically alive.
         stopJit();
         doUnloading();
         System.runFinalization();
         BufferedReader reader = new BufferedReader(new FileReader ("/proc/" + pid + "/maps"));
         String line;
         int count = 0;
         while ((line = reader.readLine()) != null) {
             if (line.contains("@141-class-unload-ex.jar")) {
                 System.out.println(line);
                 ++count;
             }
         }
         System.out.println("Number of loaded unload-ex maps " + count);
         startJit();
     }

     private static void stressTest(Constructor<?> constructor) throws Exception {
         for (int i = 0; i <= 100; ++i) {
             setUpUnloadLoader(constructor, false);
             if (i % 10 == 0) {
                 Runtime.getRuntime().gc();
             }
         }
     }

     private static void doUnloading() {
       // Do multiple GCs to prevent rare flakiness if some other thread is keeping the
       // classloader live.
       for (int i = 0; i < 5; ++i) {
          Runtime.getRuntime().gc();
       }
     }

     private static void testUnloadClass(Constructor<?> constructor) throws Exception {
         WeakReference<Class> klass = setUpUnloadClassWeak(constructor);
         // No strong references to class loader, should get unloaded.
         doUnloading();
         WeakReference<Class> klass2 = setUpUnloadClassWeak(constructor);
         doUnloading();
         // If the weak reference is cleared, then it was unloaded.
         System.out.println(klass.get());
         System.out.println(klass2.get());
     }

     private static void testUnloadLoader(Constructor<?> constructor)
         throws Exception {
       WeakReference<ClassLoader> loader = setUpUnloadLoader(constructor, true);
       // No strong references to class loader, should get unloaded.
       doUnloading();
       // If the weak reference is cleared, then it was unloaded.
       System.out.println(loader.get());
     }

     private static void testStackTrace(Constructor<?> constructor) throws Exception {
         Class<?> klass = setUpUnloadClass(constructor);
         WeakReference<Class> weak_klass = new WeakReference(klass);
         Method stackTraceMethod = klass.getDeclaredMethod("generateStackTrace");
         Throwable throwable = (Throwable) stackTraceMethod.invoke(klass);
         stackTraceMethod = null;
         klass = null;
         doUnloading();
         boolean isNull = weak_klass.get() == null;
         System.out.println("class null " + isNull + " " + throwable.getMessage());
     }

     private static void testLoadAndUnloadLibrary(Constructor<?> constructor) throws Exception {
         WeakReference<ClassLoader> loader = setUpLoadLibrary(constructor);
         // No strong references to class loader, should get unloaded.
         doUnloading();
         // If the weak reference is cleared, then it was unloaded.
         System.out.println(loader.get());
     }

     private static Object testNoUnloadHelper(ClassLoader loader) throws Exception {
         Class<?> intHolder = loader.loadClass("IntHolder");
         return intHolder.newInstance();
     }

     static class Pair {
       public Pair(Object o, ClassLoader l) {
         object = o;
         classLoader = new WeakReference<ClassLoader>(l);
       }

       public Object object;
       public WeakReference<ClassLoader> classLoader;
     }

     private static Pair testNoUnloadInstanceHelper(Constructor<?> constructor) throws Exception {
         ClassLoader loader = (ClassLoader) constructor.newInstance(
             DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
         Object o = testNoUnloadHelper(loader);
         return new Pair(o, loader);
     }

     private static void testNoUnloadInstance(Constructor<?> constructor) throws Exception {
         Pair p = testNoUnloadInstanceHelper(constructor);
         doUnloading();
         // If the class loader was unloded too early due to races, just pass the test.
         boolean isNull = p.classLoader.get() == null;
         System.out.println("loader null " + isNull);
     }

     private static Class<?> setUpUnloadClass(Constructor<?> constructor) throws Exception {
         ClassLoader loader = (ClassLoader) constructor.newInstance(
             DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
         Class<?> intHolder = loader.loadClass("IntHolder");
         Method getValue = intHolder.getDeclaredMethod("getValue");
         Method setValue = intHolder.getDeclaredMethod("setValue", Integer.TYPE);
         // Make sure we don't accidentally preserve the value in the int holder, the class
         // initializer should be re-run.
         System.out.println((int) getValue.invoke(intHolder));
         setValue.invoke(intHolder, 2);
         System.out.println((int) getValue.invoke(intHolder));
         waitForCompilation(intHolder);
         return intHolder;
     }

     private static Object allocObjectInOtherClassLoader(Constructor<?> constructor)
             throws Exception {
       ClassLoader loader = (ClassLoader) constructor.newInstance(
               DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
       return loader.loadClass("IntHolder").newInstance();
     }

     // Regression test for public issue 227182.
     private static void testStickyUnload(Constructor<?> constructor) throws Exception {
         String s = "";
         for (int i = 0; i < 10; ++i) {
             s = "";
             // The object is the only thing preventing the class loader from being unloaded.
             Object o = allocObjectInOtherClassLoader(constructor);
             for (int j = 0; j < 1000; ++j) {
                 s += j + " ";
             }
             // Make sure the object still has a valid class (hasn't been incorrectly unloaded).
             s += o.getClass().getName();
             o = null;
         }
         System.out.println("Too small " + (s.length() < 1000));
     }

     private static WeakReference<Class> setUpUnloadClassWeak(Constructor<?> constructor)
             throws Exception {
         return new WeakReference<Class>(setUpUnloadClass(constructor));
     }

     private static WeakReference<ClassLoader> setUpUnloadLoader(Constructor<?> constructor,
                                                                 boolean waitForCompilation)
         throws Exception {
         ClassLoader loader = (ClassLoader) constructor.newInstance(
             DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
         Class<?> intHolder = loader.loadClass("IntHolder");
         Method setValue = intHolder.getDeclaredMethod("setValue", Integer.TYPE);
         setValue.invoke(intHolder, 2);
         if (waitForCompilation) {
             waitForCompilation(intHolder);
         }
         return new WeakReference(loader);
     }

     private static void waitForCompilation(Class<?> intHolder) throws Exception {
       // Load the native library so that we can call waitForCompilation.
       Method loadLibrary = intHolder.getDeclaredMethod("loadLibrary", String.class);
       loadLibrary.invoke(intHolder, nativeLibraryName);
       // Wait for JIT compilation to finish since the async threads may prevent unloading.
       Method waitForCompilation = intHolder.getDeclaredMethod("waitForCompilation");
       waitForCompilation.invoke(intHolder);
     }

     private static WeakReference<ClassLoader> setUpLoadLibrary(Constructor<?> constructor)
         throws Exception {
         ClassLoader loader = (ClassLoader) constructor.newInstance(
             DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
         Class<?> intHolder = loader.loadClass("IntHolder");
         Method loadLibrary = intHolder.getDeclaredMethod("loadLibrary", String.class);
         loadLibrary.invoke(intHolder, nativeLibraryName);
         waitForCompilation(intHolder);
         return new WeakReference(loader);
     }

     private static int getPid() throws Exception {
       return Integer.parseInt(new File("/proc/self").getCanonicalFile().getName());
     }

     public static native void stopJit();
     public static native void startJit();
 }
	/*
	* Copyright (C) 2015 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.io.BufferedReader;
	import java.io.File;
	import java.io.FileReader;
	import java.lang.ref.WeakReference;
	import java.lang.reflect.Constructor;
	import java.lang.reflect.Method;

	public class Main {
	static final String DEX_FILE = System.getenv("DEX_LOCATION") + "/141-class-unload-ex.jar";
	static final String LIBRARY_SEARCH_PATH = System.getProperty("java.library.path");
	static String nativeLibraryName;

	public static void main(String[] args) throws Exception {
	nativeLibraryName = args[0];
	Class<?> pathClassLoader = Class.forName("dalvik.system.PathClassLoader");
	if (pathClassLoader == null) {
	throw new AssertionError("Couldn't find path class loader class");
	}
	Constructor<?> constructor =
	pathClassLoader.getDeclaredConstructor(String.class, String.class, ClassLoader.class);
	try {
	testUnloadClass(constructor);
	testUnloadLoader(constructor);
	// Test that we don't unload if we have an instance.
	testNoUnloadInstance(constructor);
	// Test JNI_OnLoad and JNI_OnUnload.
	testLoadAndUnloadLibrary(constructor);
	// Test that stack traces keep the classes live.
	testStackTrace(constructor);
	// Stress test to make sure we dont leak memory.
	stressTest(constructor);
	// Test that the oat files are unloaded.
	testOatFilesUnloaded(getPid());
	// Test that objects keep class loader live for sticky GC.
	testStickyUnload(constructor);
	} catch (Exception e) {
	e.printStackTrace();
	}
	}

	private static void testOatFilesUnloaded(int pid) throws Exception {
	System.loadLibrary(nativeLibraryName);
	// Stop the JIT to ensure its threads and work queue are not keeping classes
	// artifically alive.
	stopJit();
	doUnloading();
	System.runFinalization();
	BufferedReader reader = new BufferedReader(new FileReader ("/proc/" + pid + "/maps"));
	String line;
	int count = 0;
	while ((line = reader.readLine()) != null) {
	if (line.contains("@141-class-unload-ex.jar")) {
	System.out.println(line);
	++count;
	}
	}
	System.out.println("Number of loaded unload-ex maps " + count);
	startJit();
	}

	private static void stressTest(Constructor<?> constructor) throws Exception {
	for (int i = 0; i <= 100; ++i) {
	setUpUnloadLoader(constructor, false);
	if (i % 10 == 0) {
	Runtime.getRuntime().gc();
	}
	}
	}

	private static void doUnloading() {
	// Do multiple GCs to prevent rare flakiness if some other thread is keeping the
	// classloader live.
	for (int i = 0; i < 5; ++i) {
	Runtime.getRuntime().gc();
	}
	}

	private static void testUnloadClass(Constructor<?> constructor) throws Exception {
	WeakReference<Class> klass = setUpUnloadClassWeak(constructor);
	// No strong references to class loader, should get unloaded.
	doUnloading();
	WeakReference<Class> klass2 = setUpUnloadClassWeak(constructor);
	doUnloading();
	// If the weak reference is cleared, then it was unloaded.
	System.out.println(klass.get());
	System.out.println(klass2.get());
	}

	private static void testUnloadLoader(Constructor<?> constructor)
	throws Exception {
	WeakReference<ClassLoader> loader = setUpUnloadLoader(constructor, true);
	// No strong references to class loader, should get unloaded.
	doUnloading();
	// If the weak reference is cleared, then it was unloaded.
	System.out.println(loader.get());
	}

	private static void testStackTrace(Constructor<?> constructor) throws Exception {
	Class<?> klass = setUpUnloadClass(constructor);
	WeakReference<Class> weak_klass = new WeakReference(klass);
	Method stackTraceMethod = klass.getDeclaredMethod("generateStackTrace");
	Throwable throwable = (Throwable) stackTraceMethod.invoke(klass);
	stackTraceMethod = null;
	klass = null;
	doUnloading();
	boolean isNull = weak_klass.get() == null;
	System.out.println("class null " + isNull + " " + throwable.getMessage());
	}

	private static void testLoadAndUnloadLibrary(Constructor<?> constructor) throws Exception {
	WeakReference<ClassLoader> loader = setUpLoadLibrary(constructor);
	// No strong references to class loader, should get unloaded.
	doUnloading();
	// If the weak reference is cleared, then it was unloaded.
	System.out.println(loader.get());
	}

	private static Object testNoUnloadHelper(ClassLoader loader) throws Exception {
	Class<?> intHolder = loader.loadClass("IntHolder");
	return intHolder.newInstance();
	}

	static class Pair {
	public Pair(Object o, ClassLoader l) {
	object = o;
	classLoader = new WeakReference<ClassLoader>(l);
	}

	public Object object;
	public WeakReference<ClassLoader> classLoader;
	}

	private static Pair testNoUnloadInstanceHelper(Constructor<?> constructor) throws Exception {
	ClassLoader loader = (ClassLoader) constructor.newInstance(
	DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
	Object o = testNoUnloadHelper(loader);
	return new Pair(o, loader);
	}

	private static void testNoUnloadInstance(Constructor<?> constructor) throws Exception {
	Pair p = testNoUnloadInstanceHelper(constructor);
	doUnloading();
	// If the class loader was unloded too early due to races, just pass the test.
	boolean isNull = p.classLoader.get() == null;
	System.out.println("loader null " + isNull);
	}

	private static Class<?> setUpUnloadClass(Constructor<?> constructor) throws Exception {
	ClassLoader loader = (ClassLoader) constructor.newInstance(
	DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
	Class<?> intHolder = loader.loadClass("IntHolder");
	Method getValue = intHolder.getDeclaredMethod("getValue");
	Method setValue = intHolder.getDeclaredMethod("setValue", Integer.TYPE);
	// Make sure we don't accidentally preserve the value in the int holder, the class
	// initializer should be re-run.
	System.out.println((int) getValue.invoke(intHolder));
	setValue.invoke(intHolder, 2);
	System.out.println((int) getValue.invoke(intHolder));
	waitForCompilation(intHolder);
	return intHolder;
	}

	private static Object allocObjectInOtherClassLoader(Constructor<?> constructor)
	throws Exception {
	ClassLoader loader = (ClassLoader) constructor.newInstance(
	DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
	return loader.loadClass("IntHolder").newInstance();
	}

	// Regression test for public issue 227182.
	private static void testStickyUnload(Constructor<?> constructor) throws Exception {
	String s = "";
	for (int i = 0; i < 10; ++i) {
	s = "";
	// The object is the only thing preventing the class loader from being unloaded.
	Object o = allocObjectInOtherClassLoader(constructor);
	for (int j = 0; j < 1000; ++j) {
	s += j + " ";
	}
	// Make sure the object still has a valid class (hasn't been incorrectly unloaded).
	s += o.getClass().getName();
	o = null;
	}
	System.out.println("Too small " + (s.length() < 1000));
	}

	private static WeakReference<Class> setUpUnloadClassWeak(Constructor<?> constructor)
	throws Exception {
	return new WeakReference<Class>(setUpUnloadClass(constructor));
	}

	private static WeakReference<ClassLoader> setUpUnloadLoader(Constructor<?> constructor,
	boolean waitForCompilation)
	throws Exception {
	ClassLoader loader = (ClassLoader) constructor.newInstance(
	DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
	Class<?> intHolder = loader.loadClass("IntHolder");
	Method setValue = intHolder.getDeclaredMethod("setValue", Integer.TYPE);
	setValue.invoke(intHolder, 2);
	if (waitForCompilation) {
	waitForCompilation(intHolder);
	}
	return new WeakReference(loader);
	}

	private static void waitForCompilation(Class<?> intHolder) throws Exception {
	// Load the native library so that we can call waitForCompilation.
	Method loadLibrary = intHolder.getDeclaredMethod("loadLibrary", String.class);
	loadLibrary.invoke(intHolder, nativeLibraryName);
	// Wait for JIT compilation to finish since the async threads may prevent unloading.
	Method waitForCompilation = intHolder.getDeclaredMethod("waitForCompilation");
	waitForCompilation.invoke(intHolder);
	}

	private static WeakReference<ClassLoader> setUpLoadLibrary(Constructor<?> constructor)
	throws Exception {
	ClassLoader loader = (ClassLoader) constructor.newInstance(
	DEX_FILE, LIBRARY_SEARCH_PATH, ClassLoader.getSystemClassLoader());
	Class<?> intHolder = loader.loadClass("IntHolder");
	Method loadLibrary = intHolder.getDeclaredMethod("loadLibrary", String.class);
	loadLibrary.invoke(intHolder, nativeLibraryName);
	waitForCompilation(intHolder);
	return new WeakReference(loader);
	}

	private static int getPid() throws Exception {
	return Integer.parseInt(new File("/proc/self").getCanonicalFile().getName());
	}

	public static native void stopJit();
	public static native void startJit();
	}