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| 1 | +/* | |
| 2 | + * Copyright (c) 2005, 2009, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.reflect.misc; | |
| 27 | + | |
| 28 | +import java.security.AllPermission; | |
| 29 | +import java.security.AccessController; | |
| 30 | +import java.security.PermissionCollection; | |
| 31 | +import java.security.SecureClassLoader; | |
| 32 | +import java.security.PrivilegedExceptionAction; | |
| 33 | +import java.security.CodeSource; | |
| 34 | +import java.io.InputStream; | |
| 35 | +import java.io.BufferedInputStream; | |
| 36 | +import java.io.IOException; | |
| 37 | +import java.net.URL; | |
| 38 | +import java.net.URLConnection; | |
| 39 | +import java.net.HttpURLConnection; | |
| 40 | +import java.lang.reflect.Method; | |
| 41 | +import java.lang.reflect.InvocationTargetException; | |
| 42 | +import java.lang.reflect.AccessibleObject; | |
| 43 | +import java.lang.reflect.Modifier; | |
| 44 | +import java.util.Collection; | |
| 45 | +import java.util.HashMap; | |
| 46 | +import java.util.Map; | |
| 47 | +import sun.misc.IOUtils; | |
| 48 | +import sun.net.www.ParseUtil; | |
| 49 | +import sun.security.util.SecurityConstants; | |
| 50 | + | |
| 51 | + | |
| 52 | +class Trampoline { | |
| 53 | + private static Object invoke(Method m, Object obj, Object[] params) | |
| 54 | + throws InvocationTargetException, IllegalAccessException { | |
| 55 | + return m.invoke(obj, params); | |
| 56 | + } | |
| 57 | +} | |
| 58 | + | |
| 59 | +/* | |
| 60 | + * Create a trampoline class. | |
| 61 | + */ | |
| 62 | +public final class MethodUtil extends SecureClassLoader { | |
| 63 | + private static String MISC_PKG = "sun.reflect.misc."; | |
| 64 | + private static String TRAMPOLINE = MISC_PKG + "Trampoline"; | |
| 65 | + private static Method bounce = getTrampoline(); | |
| 66 | + | |
| 67 | + private MethodUtil() { | |
| 68 | + super(); | |
| 69 | + } | |
| 70 | + | |
| 71 | + public static Method getMethod(Class<?> cls, String name, Class[] args) | |
| 72 | + throws NoSuchMethodException { | |
| 73 | + ReflectUtil.checkPackageAccess(cls); | |
| 74 | + return cls.getMethod(name, args); | |
| 75 | + } | |
| 76 | + | |
| 77 | + public static Method[] getMethods(Class cls) { | |
| 78 | + ReflectUtil.checkPackageAccess(cls); | |
| 79 | + return cls.getMethods(); | |
| 80 | + } | |
| 81 | + | |
| 82 | + /* | |
| 83 | + * Discover the public methods on public classes | |
| 84 | + * and interfaces accessible to any caller by calling | |
| 85 | + * Class.getMethods() and walking towards Object until | |
| 86 | + * we're done. | |
| 87 | + */ | |
| 88 | + public static Method[] getPublicMethods(Class cls) { | |
| 89 | + // compatibility for update release | |
| 90 | + if (System.getSecurityManager() == null) { | |
| 91 | + return cls.getMethods(); | |
| 92 | + } | |
| 93 | + Map<Signature, Method> sigs = new HashMap<Signature, Method>(); | |
| 94 | + while (cls != null) { | |
| 95 | + boolean done = getInternalPublicMethods(cls, sigs); | |
| 96 | + if (done) { | |
| 97 | + break; | |
| 98 | + } | |
| 99 | + getInterfaceMethods(cls, sigs); | |
| 100 | + cls = cls.getSuperclass(); | |
| 101 | + } | |
| 102 | + return sigs.values().toArray(new Method[sigs.size()]); | |
| 103 | + } | |
| 104 | + | |
| 105 | + /* | |
| 106 | + * Process the immediate interfaces of this class or interface. | |
| 107 | + */ | |
| 108 | + private static void getInterfaceMethods(Class cls, | |
| 109 | + Map<Signature, Method> sigs) { | |
| 110 | + Class[] intfs = cls.getInterfaces(); | |
| 111 | + for (int i=0; i < intfs.length; i++) { | |
| 112 | + Class intf = intfs[i]; | |
| 113 | + boolean done = getInternalPublicMethods(intf, sigs); | |
| 114 | + if (!done) { | |
| 115 | + getInterfaceMethods(intf, sigs); | |
| 116 | + } | |
| 117 | + } | |
| 118 | + } | |
| 119 | + | |
| 120 | + /* | |
| 121 | + * | |
| 122 | + * Process the methods in this class or interface | |
| 123 | + */ | |
| 124 | + private static boolean getInternalPublicMethods(Class cls, | |
| 125 | + Map<Signature, Method> sigs) { | |
| 126 | + Method[] methods = null; | |
| 127 | + try { | |
| 128 | + /* | |
| 129 | + * This class or interface is non-public so we | |
| 130 | + * can't use any of it's methods. Go back and | |
| 131 | + * try again with a superclass or superinterface. | |
| 132 | + */ | |
| 133 | + if (!Modifier.isPublic(cls.getModifiers())) { | |
| 134 | + return false; | |
| 135 | + } | |
| 136 | + if (!ReflectUtil.isPackageAccessible(cls)) { | |
| 137 | + return false; | |
| 138 | + } | |
| 139 | + | |
| 140 | + methods = cls.getMethods(); | |
| 141 | + } catch (SecurityException se) { | |
| 142 | + return false; | |
| 143 | + } | |
| 144 | + | |
| 145 | + /* | |
| 146 | + * Check for inherited methods with non-public | |
| 147 | + * declaring classes. They might override and hide | |
| 148 | + * methods from their superclasses or | |
| 149 | + * superinterfaces. | |
| 150 | + */ | |
| 151 | + boolean done = true; | |
| 152 | + for (int i=0; i < methods.length; i++) { | |
| 153 | + Class dc = methods[i].getDeclaringClass(); | |
| 154 | + if (!Modifier.isPublic(dc.getModifiers())) { | |
| 155 | + done = false; | |
| 156 | + break; | |
| 157 | + } | |
| 158 | + } | |
| 159 | + | |
| 160 | + if (done) { | |
| 161 | + /* | |
| 162 | + * We're done. Spray all the methods into | |
| 163 | + * the list and then we're out of here. | |
| 164 | + */ | |
| 165 | + for (int i=0; i < methods.length; i++) { | |
| 166 | + addMethod(sigs, methods[i]); | |
| 167 | + } | |
| 168 | + } else { | |
| 169 | + /* | |
| 170 | + * Simulate cls.getDeclaredMethods() by | |
| 171 | + * stripping away inherited methods. | |
| 172 | + */ | |
| 173 | + for (int i=0; i < methods.length; i++) { | |
| 174 | + Class dc = methods[i].getDeclaringClass(); | |
| 175 | + if (cls.equals(dc)) { | |
| 176 | + addMethod(sigs, methods[i]); | |
| 177 | + } | |
| 178 | + } | |
| 179 | + } | |
| 180 | + return done; | |
| 181 | + } | |
| 182 | + | |
| 183 | + private static void addMethod(Map<Signature, Method> sigs, Method method) { | |
| 184 | + Signature signature = new Signature(method); | |
| 185 | + if (!sigs.containsKey(signature)) { | |
| 186 | + sigs.put(signature, method); | |
| 187 | + } else if (!method.getDeclaringClass().isInterface()){ | |
| 188 | + /* | |
| 189 | + * Superclasses beat interfaces. | |
| 190 | + */ | |
| 191 | + Method old = sigs.get(signature); | |
| 192 | + if (old.getDeclaringClass().isInterface()) { | |
| 193 | + sigs.put(signature, method); | |
| 194 | + } | |
| 195 | + } | |
| 196 | + } | |
| 197 | + | |
| 198 | + /** | |
| 199 | + * A class that represents the unique elements of a method that will be a | |
| 200 | + * key in the method cache. | |
| 201 | + */ | |
| 202 | + private static class Signature { | |
| 203 | + private String methodName; | |
| 204 | + private Class[] argClasses; | |
| 205 | + | |
| 206 | + private volatile int hashCode = 0; | |
| 207 | + | |
| 208 | + Signature(Method m) { | |
| 209 | + this.methodName = m.getName(); | |
| 210 | + this.argClasses = m.getParameterTypes(); | |
| 211 | + } | |
| 212 | + | |
| 213 | + public boolean equals(Object o2) { | |
| 214 | + if (this == o2) { | |
| 215 | + return true; | |
| 216 | + } | |
| 217 | + Signature that = (Signature)o2; | |
| 218 | + if (!(methodName.equals(that.methodName))) { | |
| 219 | + return false; | |
| 220 | + } | |
| 221 | + if (argClasses.length != that.argClasses.length) { | |
| 222 | + return false; | |
| 223 | + } | |
| 224 | + for (int i = 0; i < argClasses.length; i++) { | |
| 225 | + if (!(argClasses[i] == that.argClasses[i])) { | |
| 226 | + return false; | |
| 227 | + } | |
| 228 | + } | |
| 229 | + return true; | |
| 230 | + } | |
| 231 | + | |
| 232 | + /** | |
| 233 | + * Hash code computed using algorithm suggested in | |
| 234 | + * Effective Java, Item 8. | |
| 235 | + */ | |
| 236 | + public int hashCode() { | |
| 237 | + if (hashCode == 0) { | |
| 238 | + int result = 17; | |
| 239 | + result = 37 * result + methodName.hashCode(); | |
| 240 | + if (argClasses != null) { | |
| 241 | + for (int i = 0; i < argClasses.length; i++) { | |
| 242 | + result = 37 * result + ((argClasses[i] == null) ? 0 : | |
| 243 | + argClasses[i].hashCode()); | |
| 244 | + } | |
| 245 | + } | |
| 246 | + hashCode = result; | |
| 247 | + } | |
| 248 | + return hashCode; | |
| 249 | + } | |
| 250 | + } | |
| 251 | + | |
| 252 | + | |
| 253 | + /* | |
| 254 | + * Bounce through the trampoline. | |
| 255 | + */ | |
| 256 | + public static Object invoke(Method m, Object obj, Object[] params) | |
| 257 | + throws InvocationTargetException, IllegalAccessException { | |
| 258 | + if (m.getDeclaringClass().equals(AccessController.class) || | |
| 259 | + m.getDeclaringClass().equals(Method.class)) | |
| 260 | + throw new InvocationTargetException( | |
| 261 | + new UnsupportedOperationException("invocation not supported")); | |
| 262 | + try { | |
| 263 | + return bounce.invoke(null, new Object[] {m, obj, params}); | |
| 264 | + } catch (InvocationTargetException ie) { | |
| 265 | + Throwable t = ie.getCause(); | |
| 266 | + | |
| 267 | + if (t instanceof InvocationTargetException) { | |
| 268 | + throw (InvocationTargetException)t; | |
| 269 | + } else if (t instanceof IllegalAccessException) { | |
| 270 | + throw (IllegalAccessException)t; | |
| 271 | + } else if (t instanceof RuntimeException) { | |
| 272 | + throw (RuntimeException)t; | |
| 273 | + } else if (t instanceof Error) { | |
| 274 | + throw (Error)t; | |
| 275 | + } else { | |
| 276 | + throw new Error("Unexpected invocation error", t); | |
| 277 | + } | |
| 278 | + } catch (IllegalAccessException iae) { | |
| 279 | + // this can't happen | |
| 280 | + throw new Error("Unexpected invocation error", iae); | |
| 281 | + } | |
| 282 | + } | |
| 283 | + | |
| 284 | + private static Method getTrampoline() { | |
| 285 | + try { | |
| 286 | + return AccessController.doPrivileged( | |
| 287 | + new PrivilegedExceptionAction<Method>() { | |
| 288 | + public Method run() throws Exception { | |
| 289 | + Class<?> t = getTrampolineClass(); | |
| 290 | + Class[] types = { | |
| 291 | + Method.class, Object.class, Object[].class | |
| 292 | + }; | |
| 293 | + Method b = t.getDeclaredMethod("invoke", types); | |
| 294 | + ((AccessibleObject)b).setAccessible(true); | |
| 295 | + return b; | |
| 296 | + } | |
| 297 | + }); | |
| 298 | + } catch (Exception e) { | |
| 299 | + throw new InternalError("bouncer cannot be found"); | |
| 300 | + } | |
| 301 | + } | |
| 302 | + | |
| 303 | + | |
| 304 | + protected synchronized Class loadClass(String name, boolean resolve) | |
| 305 | + throws ClassNotFoundException | |
| 306 | + { | |
| 307 | + // First, check if the class has already been loaded | |
| 308 | + ReflectUtil.checkPackageAccess(name); | |
| 309 | + Class c = findLoadedClass(name); | |
| 310 | + if (c == null) { | |
| 311 | + try { | |
| 312 | + c = findClass(name); | |
| 313 | + } catch (ClassNotFoundException e) { | |
| 314 | + // Fall through ... | |
| 315 | + } | |
| 316 | + if (c == null) { | |
| 317 | + c = getParent().loadClass(name); | |
| 318 | + } | |
| 319 | + } | |
| 320 | + if (resolve) { | |
| 321 | + resolveClass(c); | |
| 322 | + } | |
| 323 | + return c; | |
| 324 | + } | |
| 325 | + | |
| 326 | + | |
| 327 | + protected Class findClass(final String name) | |
| 328 | + throws ClassNotFoundException | |
| 329 | + { | |
| 330 | + if (!name.startsWith(MISC_PKG)) { | |
| 331 | + throw new ClassNotFoundException(name); | |
| 332 | + } | |
| 333 | + String path = name.replace('.', '/').concat(".class"); | |
| 334 | + URL res = getResource(path); | |
| 335 | + if (res != null) { | |
| 336 | + try { | |
| 337 | + return defineClass(name, res); | |
| 338 | + } catch (IOException e) { | |
| 339 | + throw new ClassNotFoundException(name, e); | |
| 340 | + } | |
| 341 | + } else { | |
| 342 | + throw new ClassNotFoundException(name); | |
| 343 | + } | |
| 344 | + } | |
| 345 | + | |
| 346 | + | |
| 347 | + /* | |
| 348 | + * Define the proxy classes | |
| 349 | + */ | |
| 350 | + private Class defineClass(String name, URL url) throws IOException { | |
| 351 | + byte[] b = getBytes(url); | |
| 352 | + CodeSource cs = new CodeSource(null, (java.security.cert.Certificate[])null); | |
| 353 | + if (!name.equals(TRAMPOLINE)) { | |
| 354 | + throw new IOException("MethodUtil: bad name " + name); | |
| 355 | + } | |
| 356 | + return defineClass(name, b, 0, b.length, cs); | |
| 357 | + } | |
| 358 | + | |
| 359 | + | |
| 360 | + /* | |
| 361 | + * Returns the contents of the specified URL as an array of bytes. | |
| 362 | + */ | |
| 363 | + private static byte[] getBytes(URL url) throws IOException { | |
| 364 | + URLConnection uc = url.openConnection(); | |
| 365 | + if (uc instanceof java.net.HttpURLConnection) { | |
| 366 | + java.net.HttpURLConnection huc = (java.net.HttpURLConnection) uc; | |
| 367 | + int code = huc.getResponseCode(); | |
| 368 | + if (code >= java.net.HttpURLConnection.HTTP_BAD_REQUEST) { | |
| 369 | + throw new IOException("open HTTP connection failed."); | |
| 370 | + } | |
| 371 | + } | |
| 372 | + int len = uc.getContentLength(); | |
| 373 | + InputStream in = new BufferedInputStream(uc.getInputStream()); | |
| 374 | + | |
| 375 | + byte[] b; | |
| 376 | + try { | |
| 377 | + b = IOUtils.readFully(in, len, true); | |
| 378 | + } finally { | |
| 379 | + in.close(); | |
| 380 | + } | |
| 381 | + return b; | |
| 382 | + } | |
| 383 | + | |
| 384 | + | |
| 385 | + protected PermissionCollection getPermissions(CodeSource codesource) | |
| 386 | + { | |
| 387 | + PermissionCollection perms = super.getPermissions(codesource); | |
| 388 | + perms.add(new AllPermission()); | |
| 389 | + return perms; | |
| 390 | + } | |
| 391 | + | |
| 392 | + private static Class getTrampolineClass() { | |
| 393 | + try { | |
| 394 | + return Class.forName(TRAMPOLINE, true, new MethodUtil()); | |
| 395 | + } catch (ClassNotFoundException e) { | |
| 396 | + } | |
| 397 | + return null; | |
| 398 | + } | |
| 399 | + | |
| 400 | +} | |