4
|
1 |
/*
|
5555
|
2 |
* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
|
4
|
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
|
5555
|
7 |
* published by the Free Software Foundation. Oracle designates this
|
4
|
8 |
* particular file as subject to the "Classpath" exception as provided
|
5555
|
9 |
* by Oracle in the LICENSE file that accompanied this code.
|
4
|
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 |
*
|
5555
|
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.
|
4
|
24 |
*/
|
|
25 |
|
|
26 |
package sun.corba ;
|
|
27 |
|
|
28 |
import java.lang.reflect.Field ;
|
|
29 |
import java.lang.reflect.Method ;
|
|
30 |
import java.lang.reflect.Constructor ;
|
|
31 |
import java.lang.reflect.InvocationTargetException ;
|
|
32 |
|
|
33 |
import java.io.ObjectInputStream ;
|
|
34 |
|
|
35 |
import java.security.AccessController;
|
|
36 |
import java.security.Permission;
|
|
37 |
import java.security.PrivilegedAction;
|
|
38 |
|
|
39 |
import sun.misc.Unsafe ;
|
|
40 |
import sun.reflect.ReflectionFactory ;
|
|
41 |
|
|
42 |
/** This class provides the methods for fundamental JVM operations
|
|
43 |
* needed in the ORB that are not part of the public Java API. This includes:
|
|
44 |
* <ul>
|
|
45 |
* <li>throwException, which can throw undeclared checked exceptions.
|
|
46 |
* This is needed to handle throwing arbitrary exceptions across a standardized OMG interface that (incorrectly) does not specify appropriate exceptions.</li>
|
|
47 |
* <li>putXXX/getXXX methods that allow unchecked access to fields of objects.
|
|
48 |
* This is used for setting uninitialzed non-static final fields (which is
|
|
49 |
* impossible with reflection) and for speed.</li>
|
|
50 |
* <li>objectFieldOffset to obtain the field offsets for use in the putXXX/getXXX methods</li>
|
|
51 |
* <li>newConstructorForSerialization to get the special constructor required for a
|
|
52 |
* Serializable class</li>
|
|
53 |
* <li>latestUserDefinedLoader to get the latest user defined class loader from
|
|
54 |
* the call stack as required by the RMI-IIOP specification (really from the
|
|
55 |
* JDK 1.1 days)</li>
|
|
56 |
* </ul>
|
|
57 |
* The code that calls Bridge.get() must have the following Permissions:
|
|
58 |
* <ul>
|
|
59 |
* <li>RuntimePermission "reflectionFactoryAccess"</li>
|
|
60 |
* <li>BridgePermission "getBridge"</li>
|
|
61 |
* <li>ReflectPermission "suppressAccessChecks"</li>
|
|
62 |
* </ul>
|
|
63 |
* <p>
|
|
64 |
* All of these permissions are required to obtain and correctly initialize
|
|
65 |
* the instance of Bridge. No security checks are performed on calls
|
|
66 |
* made to Bridge instance methods, so access to the Bridge instance
|
|
67 |
* must be protected.
|
|
68 |
* <p>
|
|
69 |
* This class is a singleton (per ClassLoader of course). Access to the
|
|
70 |
* instance is obtained through the Bridge.get() method.
|
|
71 |
*/
|
|
72 |
public final class Bridge
|
|
73 |
{
|
|
74 |
private static final Class[] NO_ARGS = new Class[] {};
|
|
75 |
private static final Permission getBridgePermission =
|
|
76 |
new BridgePermission( "getBridge" ) ;
|
|
77 |
private static Bridge bridge = null ;
|
|
78 |
|
|
79 |
// latestUserDefinedLoader() is a private static method
|
|
80 |
// in ObjectInputStream in JDK 1.3 through 1.5.
|
|
81 |
// We use reflection in a doPrivileged block to get a
|
|
82 |
// Method reference and make it accessible.
|
|
83 |
private final Method latestUserDefinedLoaderMethod ;
|
|
84 |
private final Unsafe unsafe ;
|
|
85 |
private final ReflectionFactory reflectionFactory ;
|
|
86 |
|
|
87 |
private Method getLatestUserDefinedLoaderMethod()
|
|
88 |
{
|
|
89 |
return (Method) AccessController.doPrivileged(
|
|
90 |
new PrivilegedAction()
|
|
91 |
{
|
|
92 |
public Object run()
|
|
93 |
{
|
|
94 |
Method result = null;
|
|
95 |
|
|
96 |
try {
|
|
97 |
Class io = ObjectInputStream.class;
|
|
98 |
result = io.getDeclaredMethod(
|
|
99 |
"latestUserDefinedLoader", NO_ARGS);
|
|
100 |
result.setAccessible(true);
|
|
101 |
} catch (NoSuchMethodException nsme) {
|
|
102 |
Error err = new Error( "java.io.ObjectInputStream" +
|
|
103 |
" latestUserDefinedLoader " + nsme );
|
|
104 |
err.initCause(nsme) ;
|
|
105 |
throw err ;
|
|
106 |
}
|
|
107 |
|
|
108 |
return result;
|
|
109 |
}
|
|
110 |
}
|
|
111 |
);
|
|
112 |
}
|
|
113 |
|
|
114 |
private Unsafe getUnsafe() {
|
|
115 |
Field fld = (Field)AccessController.doPrivileged(
|
|
116 |
new PrivilegedAction()
|
|
117 |
{
|
|
118 |
public Object run()
|
|
119 |
{
|
|
120 |
Field fld = null ;
|
|
121 |
|
|
122 |
try {
|
|
123 |
Class unsafeClass = sun.misc.Unsafe.class ;
|
|
124 |
fld = unsafeClass.getDeclaredField( "theUnsafe" ) ;
|
|
125 |
fld.setAccessible( true ) ;
|
|
126 |
return fld ;
|
|
127 |
} catch (NoSuchFieldException exc) {
|
|
128 |
Error err = new Error( "Could not access Unsafe" ) ;
|
|
129 |
err.initCause( exc ) ;
|
|
130 |
throw err ;
|
|
131 |
}
|
|
132 |
}
|
|
133 |
}
|
|
134 |
) ;
|
|
135 |
|
|
136 |
Unsafe unsafe = null;
|
|
137 |
|
|
138 |
try {
|
|
139 |
unsafe = (Unsafe)(fld.get( null )) ;
|
|
140 |
} catch (Throwable t) {
|
|
141 |
Error err = new Error( "Could not access Unsafe" ) ;
|
|
142 |
err.initCause( t ) ;
|
|
143 |
throw err ;
|
|
144 |
}
|
|
145 |
|
|
146 |
return unsafe ;
|
|
147 |
}
|
|
148 |
|
|
149 |
|
|
150 |
private Bridge()
|
|
151 |
{
|
|
152 |
latestUserDefinedLoaderMethod = getLatestUserDefinedLoaderMethod();
|
|
153 |
unsafe = getUnsafe() ;
|
|
154 |
reflectionFactory = (ReflectionFactory)AccessController.doPrivileged(
|
|
155 |
new ReflectionFactory.GetReflectionFactoryAction());
|
|
156 |
}
|
|
157 |
|
|
158 |
/** Fetch the Bridge singleton. This requires the following
|
|
159 |
* permissions:
|
|
160 |
* <ul>
|
|
161 |
* <li>RuntimePermission "reflectionFactoryAccess"</li>
|
|
162 |
* <li>BridgePermission "getBridge"</li>
|
|
163 |
* <li>ReflectPermission "suppressAccessChecks"</li>
|
|
164 |
* </ul>
|
|
165 |
* @return The singleton instance of the Bridge class
|
|
166 |
* @throws SecurityException if the caller does not have the
|
|
167 |
* required permissions and the caller has a non-null security manager.
|
|
168 |
*/
|
|
169 |
public static final synchronized Bridge get()
|
|
170 |
{
|
|
171 |
SecurityManager sman = System.getSecurityManager() ;
|
|
172 |
if (sman != null)
|
|
173 |
sman.checkPermission( getBridgePermission ) ;
|
|
174 |
|
|
175 |
if (bridge == null) {
|
|
176 |
bridge = new Bridge() ;
|
|
177 |
}
|
|
178 |
|
|
179 |
return bridge ;
|
|
180 |
}
|
|
181 |
|
|
182 |
/** Obtain the latest user defined ClassLoader from the call stack.
|
|
183 |
* This is required by the RMI-IIOP specification.
|
|
184 |
*/
|
|
185 |
public final ClassLoader getLatestUserDefinedLoader()
|
|
186 |
{
|
|
187 |
try {
|
|
188 |
// Invoke the ObjectInputStream.latestUserDefinedLoader method
|
|
189 |
return (ClassLoader)latestUserDefinedLoaderMethod.invoke(null,
|
|
190 |
NO_ARGS);
|
|
191 |
} catch (InvocationTargetException ite) {
|
|
192 |
Error err = new Error(
|
|
193 |
"sun.corba.Bridge.latestUserDefinedLoader: " + ite ) ;
|
|
194 |
err.initCause( ite ) ;
|
|
195 |
throw err ;
|
|
196 |
} catch (IllegalAccessException iae) {
|
|
197 |
Error err = new Error(
|
|
198 |
"sun.corba.Bridge.latestUserDefinedLoader: " + iae ) ;
|
|
199 |
err.initCause( iae ) ;
|
|
200 |
throw err ;
|
|
201 |
}
|
|
202 |
}
|
|
203 |
|
|
204 |
/**
|
|
205 |
* Fetches a field element within the given
|
|
206 |
* object <code>o</code> at the given offset.
|
|
207 |
* The result is undefined unless the offset was obtained from
|
|
208 |
* {@link #objectFieldOffset} on the {@link java.lang.reflect.Field}
|
|
209 |
* of some Java field and the object referred to by <code>o</code>
|
|
210 |
* is of a class compatible with that field's class.
|
|
211 |
* @param o Java heap object in which the field from which the offset
|
|
212 |
* was obtained resides
|
|
213 |
* @param offset indication of where the field resides in a Java heap
|
|
214 |
* object
|
|
215 |
* @return the value fetched from the indicated Java field
|
|
216 |
* @throws RuntimeException No defined exceptions are thrown, not even
|
|
217 |
* {@link NullPointerException}
|
|
218 |
*/
|
|
219 |
public final int getInt(Object o, long offset)
|
|
220 |
{
|
|
221 |
return unsafe.getInt( o, offset ) ;
|
|
222 |
}
|
|
223 |
|
|
224 |
/**
|
|
225 |
* Stores a value into a given Java field.
|
|
226 |
* <p>
|
|
227 |
* The first two parameters are interpreted exactly as with
|
|
228 |
* {@link #getInt(Object, long)} to refer to a specific
|
|
229 |
* Java field. The given value is stored into that field.
|
|
230 |
* <p>
|
|
231 |
* The field must be of the same type as the method
|
|
232 |
* parameter <code>x</code>.
|
|
233 |
*
|
|
234 |
* @param o Java heap object in which the field resides, if any, else
|
|
235 |
* null
|
|
236 |
* @param offset indication of where the field resides in a Java heap
|
|
237 |
* object.
|
|
238 |
* @param x the value to store into the indicated Java field
|
|
239 |
* @throws RuntimeException No defined exceptions are thrown, not even
|
|
240 |
* {@link NullPointerException}
|
|
241 |
*/
|
|
242 |
public final void putInt(Object o, long offset, int x)
|
|
243 |
{
|
|
244 |
unsafe.putInt( o, offset, x ) ;
|
|
245 |
}
|
|
246 |
|
|
247 |
/**
|
|
248 |
* @see #getInt(Object, long)
|
|
249 |
*/
|
|
250 |
public final Object getObject(Object o, long offset)
|
|
251 |
{
|
|
252 |
return unsafe.getObject( o, offset ) ;
|
|
253 |
}
|
|
254 |
|
|
255 |
/**
|
|
256 |
* @see #putInt(Object, long, int)
|
|
257 |
*/
|
|
258 |
public final void putObject(Object o, long offset, Object x)
|
|
259 |
{
|
|
260 |
unsafe.putObject( o, offset, x ) ;
|
|
261 |
}
|
|
262 |
|
|
263 |
/** @see #getInt(Object, long) */
|
|
264 |
public final boolean getBoolean(Object o, long offset)
|
|
265 |
{
|
|
266 |
return unsafe.getBoolean( o, offset ) ;
|
|
267 |
}
|
|
268 |
/** @see #putInt(Object, long, int) */
|
|
269 |
public final void putBoolean(Object o, long offset, boolean x)
|
|
270 |
{
|
|
271 |
unsafe.putBoolean( o, offset, x ) ;
|
|
272 |
}
|
|
273 |
/** @see #getInt(Object, long) */
|
|
274 |
public final byte getByte(Object o, long offset)
|
|
275 |
{
|
|
276 |
return unsafe.getByte( o, offset ) ;
|
|
277 |
}
|
|
278 |
/** @see #putInt(Object, long, int) */
|
|
279 |
public final void putByte(Object o, long offset, byte x)
|
|
280 |
{
|
|
281 |
unsafe.putByte( o, offset, x ) ;
|
|
282 |
}
|
|
283 |
/** @see #getInt(Object, long) */
|
|
284 |
public final short getShort(Object o, long offset)
|
|
285 |
{
|
|
286 |
return unsafe.getShort( o, offset ) ;
|
|
287 |
}
|
|
288 |
/** @see #putInt(Object, long, int) */
|
|
289 |
public final void putShort(Object o, long offset, short x)
|
|
290 |
{
|
|
291 |
unsafe.putShort( o, offset, x ) ;
|
|
292 |
}
|
|
293 |
/** @see #getInt(Object, long) */
|
|
294 |
public final char getChar(Object o, long offset)
|
|
295 |
{
|
|
296 |
return unsafe.getChar( o, offset ) ;
|
|
297 |
}
|
|
298 |
/** @see #putInt(Object, long, int) */
|
|
299 |
public final void putChar(Object o, long offset, char x)
|
|
300 |
{
|
|
301 |
unsafe.putChar( o, offset, x ) ;
|
|
302 |
}
|
|
303 |
/** @see #getInt(Object, long) */
|
|
304 |
public final long getLong(Object o, long offset)
|
|
305 |
{
|
|
306 |
return unsafe.getLong( o, offset ) ;
|
|
307 |
}
|
|
308 |
/** @see #putInt(Object, long, int) */
|
|
309 |
public final void putLong(Object o, long offset, long x)
|
|
310 |
{
|
|
311 |
unsafe.putLong( o, offset, x ) ;
|
|
312 |
}
|
|
313 |
/** @see #getInt(Object, long) */
|
|
314 |
public final float getFloat(Object o, long offset)
|
|
315 |
{
|
|
316 |
return unsafe.getFloat( o, offset ) ;
|
|
317 |
}
|
|
318 |
/** @see #putInt(Object, long, int) */
|
|
319 |
public final void putFloat(Object o, long offset, float x)
|
|
320 |
{
|
|
321 |
unsafe.putFloat( o, offset, x ) ;
|
|
322 |
}
|
|
323 |
/** @see #getInt(Object, long) */
|
|
324 |
public final double getDouble(Object o, long offset)
|
|
325 |
{
|
|
326 |
return unsafe.getDouble( o, offset ) ;
|
|
327 |
}
|
|
328 |
/** @see #putInt(Object, long, int) */
|
|
329 |
public final void putDouble(Object o, long offset, double x)
|
|
330 |
{
|
|
331 |
unsafe.putDouble( o, offset, x ) ;
|
|
332 |
}
|
|
333 |
|
|
334 |
/**
|
|
335 |
* This constant differs from all results that will ever be returned from
|
|
336 |
* {@link #objectFieldOffset}.
|
|
337 |
*/
|
|
338 |
public static final long INVALID_FIELD_OFFSET = -1;
|
|
339 |
|
|
340 |
/**
|
|
341 |
* Returns the offset of a non-static field.
|
|
342 |
*/
|
|
343 |
public final long objectFieldOffset(Field f)
|
|
344 |
{
|
|
345 |
return unsafe.objectFieldOffset( f ) ;
|
|
346 |
}
|
|
347 |
|
|
348 |
/** Throw the exception.
|
|
349 |
* The exception may be an undeclared checked exception.
|
|
350 |
*/
|
|
351 |
public final void throwException(Throwable ee)
|
|
352 |
{
|
|
353 |
unsafe.throwException( ee ) ;
|
|
354 |
}
|
|
355 |
|
|
356 |
/** Obtain a constructor for Class cl using constructor cons which
|
|
357 |
* may be the constructor defined in a superclass of cl. This is
|
|
358 |
* used to create a constructor for Serializable classes that
|
|
359 |
* constructs an instance of the Serializable class using the
|
|
360 |
* no args constructor of the first non-Serializable superclass
|
|
361 |
* of the Serializable class.
|
|
362 |
*/
|
|
363 |
public final Constructor newConstructorForSerialization( Class cl,
|
|
364 |
Constructor cons )
|
|
365 |
{
|
|
366 |
return reflectionFactory.newConstructorForSerialization( cl, cons ) ;
|
|
367 |
}
|
|
368 |
}
|