--- old/src/java.xml.bind/share/classes/com/sun/xml/internal/bind/v2/runtime/reflect/opt/Injector.java 2018-01-30 20:34:37.000000000 -0500 +++ /dev/null 2018-01-30 20:34:37.000000000 -0500 @@ -1,350 +0,0 @@ -/* - * Copyright (c) 1997, 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. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * 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. - */ - -package com.sun.xml.internal.bind.v2.runtime.reflect.opt; - -import java.lang.reflect.InvocationTargetException; -import java.lang.reflect.Method; -import java.lang.ref.WeakReference; -import java.security.AccessController; -import java.security.PrivilegedAction; -import java.util.concurrent.locks.Lock; -import java.util.concurrent.locks.ReentrantReadWriteLock; -import java.util.HashMap; -import java.util.Map; -import java.util.WeakHashMap; -import java.util.logging.Level; -import java.util.logging.Logger; - -import com.sun.xml.internal.bind.Util; -import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor; -import java.lang.reflect.Field; -import java.security.CodeSource; -import java.security.PrivilegedActionException; -import java.security.PrivilegedExceptionAction; -import java.security.ProtectionDomain; - -/** - * A {@link ClassLoader} used to "inject" optimized accessor classes - * into the VM. - * - *

- * Its parent class loader needs to be set to the one that can see the user - * class. - * - * @author Kohsuke Kawaguchi - */ -final class Injector { - - /** - * {@link Injector}s keyed by their parent {@link ClassLoader}. - * - * We only need one injector per one user class loader. - */ - private static final ReentrantReadWriteLock irwl = new ReentrantReadWriteLock(); - private static final Lock ir = irwl.readLock(); - private static final Lock iw = irwl.writeLock(); - private static final Map> injectors = - new WeakHashMap>(); - private static final Logger logger = Util.getClassLogger(); - - /** - * Injects a new class into the given class loader. - * - * @return null - * if it fails to inject. - */ - static Class inject(ClassLoader cl, String className, byte[] image) { - Injector injector = get(cl); - if (injector != null) { - return injector.inject(className, image); - } else { - return null; - } - } - - /** - * Returns the already injected class, or null. - */ - static Class find(ClassLoader cl, String className) { - Injector injector = get(cl); - if (injector != null) { - return injector.find(className); - } else { - return null; - } - } - - /** - * Gets or creates an {@link Injector} for the given class loader. - * - * @return null - * if it fails. - */ - private static Injector get(ClassLoader cl) { - Injector injector = null; - WeakReference wr; - ir.lock(); - try { - wr = injectors.get(cl); - } finally { - ir.unlock(); - } - if (wr != null) { - injector = wr.get(); - } - if (injector == null) { - try { - wr = new WeakReference(injector = new Injector(cl)); - iw.lock(); - try { - if (!injectors.containsKey(cl)) { - injectors.put(cl, wr); - } - } finally { - iw.unlock(); - } - } catch (SecurityException e) { - logger.log(Level.FINE, "Unable to set up a back-door for the injector", e); - return null; - } - } - return injector; - } - /** - * Injected classes keyed by their names. - */ - private final Map classes = new HashMap<>(); - private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); - private final Lock r = rwl.readLock(); - private final Lock w = rwl.writeLock(); - private final ClassLoader parent; - /** - * True if this injector is capable of injecting accessors. - * False otherwise, which happens if this classloader can't see {@link Accessor}. - */ - private final boolean loadable; - private static Method defineClass; - private static Method resolveClass; - private static Method findLoadedClass; - private static Object U; - - static { - try { - Method[] m = AccessController.doPrivileged( - new PrivilegedAction() { - @Override - public Method[] run() { - return new Method[]{ - getMethod(ClassLoader.class, "defineClass", String.class, byte[].class, Integer.TYPE, Integer.TYPE), - getMethod(ClassLoader.class, "resolveClass", Class.class), - getMethod(ClassLoader.class, "findLoadedClass", String.class) - }; - } - } - ); - defineClass = m[0]; - resolveClass = m[1]; - findLoadedClass = m[2]; - } catch (Throwable t) { - try { - U = AccessController.doPrivileged(new PrivilegedExceptionAction() { - @Override - public Object run() throws Exception { - Class u = Class.forName("sun.misc.Unsafe"); - Field theUnsafe = u.getDeclaredField("theUnsafe"); - theUnsafe.setAccessible(true); - return theUnsafe.get(null); - } - }); - defineClass = AccessController.doPrivileged(new PrivilegedExceptionAction() { - @Override - public Method run() throws Exception { - try { - return U.getClass().getMethod("defineClass", - new Class[]{String.class, - byte[].class, - Integer.TYPE, - Integer.TYPE, - ClassLoader.class, - ProtectionDomain.class}); - } catch (NoSuchMethodException | SecurityException ex) { - throw ex; - } - } - }); - } catch (SecurityException | PrivilegedActionException ex) { - Logger.getLogger(Injector.class.getName()).log(Level.SEVERE, null, ex); - } - } - } - - private static Method getMethod(final Class c, final String methodname, final Class... params) { - try { - Method m = c.getDeclaredMethod(methodname, params); - m.setAccessible(true); - return m; - } catch (NoSuchMethodException e) { - throw new NoSuchMethodError(e.getMessage()); - } - } - - private Injector(ClassLoader parent) { - this.parent = parent; - assert parent != null; - - boolean loadableCheck = false; - - try { - loadableCheck = parent.loadClass(Accessor.class.getName()) == Accessor.class; - } catch (ClassNotFoundException e) { - // not loadable - } - - this.loadable = loadableCheck; - } - - @SuppressWarnings("LockAcquiredButNotSafelyReleased") - private Class inject(String className, byte[] image) { - if (!loadable) // this injector cannot inject anything - { - return null; - } - - boolean wlocked = false; - boolean rlocked = false; - try { - - r.lock(); - rlocked = true; - - Class c = classes.get(className); - - // Unlock now during the findLoadedClass process to avoid - // deadlocks - r.unlock(); - rlocked = false; - - //find loaded class from classloader - if (c == null && findLoadedClass != null) { - - try { - c = (Class) findLoadedClass.invoke(parent, className.replace('/', '.')); - } catch (IllegalArgumentException | IllegalAccessException e) { - logger.log(Level.FINE, "Unable to find " + className, e); - } catch (InvocationTargetException e) { - Throwable t = e.getTargetException(); - logger.log(Level.FINE, "Unable to find " + className, t); - } - - if (c != null) { - - w.lock(); - wlocked = true; - - classes.put(className, c); - - w.unlock(); - wlocked = false; - - return c; - } - } - - if (c == null) { - - r.lock(); - rlocked = true; - - c = classes.get(className); - - // Unlock now during the define/resolve process to avoid - // deadlocks - r.unlock(); - rlocked = false; - - if (c == null) { - - // we need to inject a class into the - try { - if (resolveClass != null) { - c = (Class) defineClass.invoke(parent, className.replace('/', '.'), image, 0, image.length); - resolveClass.invoke(parent, c); - } else { - c = (Class) defineClass.invoke(U, className.replace('/', '.'), image, 0, image.length, parent, Injector.class.getProtectionDomain()); - } - } catch (IllegalAccessException e) { - logger.log(Level.FINE, "Unable to inject " + className, e); - return null; - } catch (InvocationTargetException e) { - Throwable t = e.getTargetException(); - if (t instanceof LinkageError) { - logger.log(Level.FINE, "duplicate class definition bug occured? Please report this : " + className, t); - } else { - logger.log(Level.FINE, "Unable to inject " + className, t); - } - return null; - } catch (SecurityException e) { - logger.log(Level.FINE, "Unable to inject " + className, e); - return null; - } catch (LinkageError e) { - logger.log(Level.FINE, "Unable to inject " + className, e); - return null; - } - - w.lock(); - wlocked = true; - - // During the time we were unlocked, we could have tried to - // load the class from more than one thread. Check now to see - // if someone else beat us to registering this class - if (!classes.containsKey(className)) { - classes.put(className, c); - } - - w.unlock(); - wlocked = false; - } - } - return c; - } finally { - if (rlocked) { - r.unlock(); - } - if (wlocked) { - w.unlock(); - } - } - } - - private Class find(String className) { - r.lock(); - try { - return classes.get(className); - } finally { - r.unlock(); - } - } -}