2
|
1 |
/*
|
715
|
2 |
* Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
|
2
|
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. Sun designates this
|
|
8 |
* particular file as subject to the "Classpath" exception as provided
|
|
9 |
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
22 |
* CA 95054 USA or visit www.sun.com if you need additional information or
|
|
23 |
* have any questions.
|
|
24 |
*/
|
|
25 |
|
|
26 |
package sun.reflect;
|
|
27 |
|
|
28 |
import java.lang.reflect.Field;
|
|
29 |
import java.lang.reflect.Method;
|
|
30 |
import java.lang.reflect.Constructor;
|
|
31 |
import java.lang.reflect.Modifier;
|
|
32 |
import java.security.AccessController;
|
|
33 |
import java.security.Permission;
|
|
34 |
import java.security.PrivilegedAction;
|
|
35 |
|
|
36 |
/** <P> The master factory for all reflective objects, both those in
|
|
37 |
java.lang.reflect (Fields, Methods, Constructors) as well as their
|
|
38 |
delegates (FieldAccessors, MethodAccessors, ConstructorAccessors).
|
|
39 |
</P>
|
|
40 |
|
|
41 |
<P> The methods in this class are extremely unsafe and can cause
|
|
42 |
subversion of both the language and the verifier. For this reason,
|
|
43 |
they are all instance methods, and access to the constructor of
|
|
44 |
this factory is guarded by a security check, in similar style to
|
|
45 |
{@link sun.misc.Unsafe}. </P>
|
|
46 |
*/
|
|
47 |
|
|
48 |
public class ReflectionFactory {
|
|
49 |
|
|
50 |
private static boolean initted = false;
|
|
51 |
private static Permission reflectionFactoryAccessPerm
|
|
52 |
= new RuntimePermission("reflectionFactoryAccess");
|
|
53 |
private static ReflectionFactory soleInstance = new ReflectionFactory();
|
|
54 |
// Provides access to package-private mechanisms in java.lang.reflect
|
|
55 |
private static volatile LangReflectAccess langReflectAccess;
|
|
56 |
|
|
57 |
//
|
|
58 |
// "Inflation" mechanism. Loading bytecodes to implement
|
|
59 |
// Method.invoke() and Constructor.newInstance() currently costs
|
|
60 |
// 3-4x more than an invocation via native code for the first
|
|
61 |
// invocation (though subsequent invocations have been benchmarked
|
|
62 |
// to be over 20x faster). Unfortunately this cost increases
|
|
63 |
// startup time for certain applications that use reflection
|
|
64 |
// intensively (but only once per class) to bootstrap themselves.
|
|
65 |
// To avoid this penalty we reuse the existing JVM entry points
|
|
66 |
// for the first few invocations of Methods and Constructors and
|
|
67 |
// then switch to the bytecode-based implementations.
|
|
68 |
//
|
|
69 |
// Package-private to be accessible to NativeMethodAccessorImpl
|
|
70 |
// and NativeConstructorAccessorImpl
|
|
71 |
private static boolean noInflation = false;
|
|
72 |
private static int inflationThreshold = 15;
|
|
73 |
|
|
74 |
private ReflectionFactory() {
|
|
75 |
}
|
|
76 |
|
|
77 |
/**
|
|
78 |
* A convenience class for acquiring the capability to instantiate
|
|
79 |
* reflective objects. Use this instead of a raw call to {@link
|
|
80 |
* #getReflectionFactory} in order to avoid being limited by the
|
|
81 |
* permissions of your callers.
|
|
82 |
*
|
|
83 |
* <p>An instance of this class can be used as the argument of
|
|
84 |
* <code>AccessController.doPrivileged</code>.
|
|
85 |
*/
|
|
86 |
public static final class GetReflectionFactoryAction
|
51
|
87 |
implements PrivilegedAction<ReflectionFactory> {
|
|
88 |
public ReflectionFactory run() {
|
2
|
89 |
return getReflectionFactory();
|
|
90 |
}
|
|
91 |
}
|
|
92 |
|
|
93 |
/**
|
|
94 |
* Provides the caller with the capability to instantiate reflective
|
|
95 |
* objects.
|
|
96 |
*
|
|
97 |
* <p> First, if there is a security manager, its
|
|
98 |
* <code>checkPermission</code> method is called with a {@link
|
|
99 |
* java.lang.RuntimePermission} with target
|
|
100 |
* <code>"reflectionFactoryAccess"</code>. This may result in a
|
|
101 |
* security exception.
|
|
102 |
*
|
|
103 |
* <p> The returned <code>ReflectionFactory</code> object should be
|
|
104 |
* carefully guarded by the caller, since it can be used to read and
|
|
105 |
* write private data and invoke private methods, as well as to load
|
|
106 |
* unverified bytecodes. It must never be passed to untrusted code.
|
|
107 |
*
|
|
108 |
* @exception SecurityException if a security manager exists and its
|
|
109 |
* <code>checkPermission</code> method doesn't allow
|
|
110 |
* access to the RuntimePermission "reflectionFactoryAccess". */
|
|
111 |
public static ReflectionFactory getReflectionFactory() {
|
|
112 |
SecurityManager security = System.getSecurityManager();
|
|
113 |
if (security != null) {
|
|
114 |
// TO DO: security.checkReflectionFactoryAccess();
|
|
115 |
security.checkPermission(reflectionFactoryAccessPerm);
|
|
116 |
}
|
|
117 |
return soleInstance;
|
|
118 |
}
|
|
119 |
|
|
120 |
//--------------------------------------------------------------------------
|
|
121 |
//
|
|
122 |
// Routines used by java.lang.reflect
|
|
123 |
//
|
|
124 |
//
|
|
125 |
|
|
126 |
/** Called only by java.lang.reflect.Modifier's static initializer */
|
|
127 |
public void setLangReflectAccess(LangReflectAccess access) {
|
|
128 |
langReflectAccess = access;
|
|
129 |
}
|
|
130 |
|
|
131 |
/**
|
|
132 |
* Note: this routine can cause the declaring class for the field
|
|
133 |
* be initialized and therefore must not be called until the
|
|
134 |
* first get/set of this field.
|
|
135 |
* @param field the field
|
|
136 |
* @param override true if caller has overridden aaccessibility
|
|
137 |
*/
|
|
138 |
public FieldAccessor newFieldAccessor(Field field, boolean override) {
|
|
139 |
checkInitted();
|
|
140 |
return UnsafeFieldAccessorFactory.newFieldAccessor(field, override);
|
|
141 |
}
|
|
142 |
|
|
143 |
public MethodAccessor newMethodAccessor(Method method) {
|
|
144 |
checkInitted();
|
|
145 |
|
|
146 |
if (noInflation) {
|
|
147 |
return new MethodAccessorGenerator().
|
|
148 |
generateMethod(method.getDeclaringClass(),
|
|
149 |
method.getName(),
|
|
150 |
method.getParameterTypes(),
|
|
151 |
method.getReturnType(),
|
|
152 |
method.getExceptionTypes(),
|
|
153 |
method.getModifiers());
|
|
154 |
} else {
|
|
155 |
NativeMethodAccessorImpl acc =
|
|
156 |
new NativeMethodAccessorImpl(method);
|
|
157 |
DelegatingMethodAccessorImpl res =
|
|
158 |
new DelegatingMethodAccessorImpl(acc);
|
|
159 |
acc.setParent(res);
|
|
160 |
return res;
|
|
161 |
}
|
|
162 |
}
|
|
163 |
|
|
164 |
public ConstructorAccessor newConstructorAccessor(Constructor c) {
|
|
165 |
checkInitted();
|
|
166 |
|
51
|
167 |
Class<?> declaringClass = c.getDeclaringClass();
|
2
|
168 |
if (Modifier.isAbstract(declaringClass.getModifiers())) {
|
|
169 |
return new InstantiationExceptionConstructorAccessorImpl(null);
|
|
170 |
}
|
|
171 |
if (declaringClass == Class.class) {
|
|
172 |
return new InstantiationExceptionConstructorAccessorImpl
|
|
173 |
("Can not instantiate java.lang.Class");
|
|
174 |
}
|
|
175 |
// Bootstrapping issue: since we use Class.newInstance() in
|
|
176 |
// the ConstructorAccessor generation process, we have to
|
|
177 |
// break the cycle here.
|
|
178 |
if (Reflection.isSubclassOf(declaringClass,
|
|
179 |
ConstructorAccessorImpl.class)) {
|
|
180 |
return new BootstrapConstructorAccessorImpl(c);
|
|
181 |
}
|
|
182 |
|
|
183 |
if (noInflation) {
|
|
184 |
return new MethodAccessorGenerator().
|
|
185 |
generateConstructor(c.getDeclaringClass(),
|
|
186 |
c.getParameterTypes(),
|
|
187 |
c.getExceptionTypes(),
|
|
188 |
c.getModifiers());
|
|
189 |
} else {
|
|
190 |
NativeConstructorAccessorImpl acc =
|
|
191 |
new NativeConstructorAccessorImpl(c);
|
|
192 |
DelegatingConstructorAccessorImpl res =
|
|
193 |
new DelegatingConstructorAccessorImpl(acc);
|
|
194 |
acc.setParent(res);
|
|
195 |
return res;
|
|
196 |
}
|
|
197 |
}
|
|
198 |
|
|
199 |
//--------------------------------------------------------------------------
|
|
200 |
//
|
|
201 |
// Routines used by java.lang
|
|
202 |
//
|
|
203 |
//
|
|
204 |
|
|
205 |
/** Creates a new java.lang.reflect.Field. Access checks as per
|
|
206 |
java.lang.reflect.AccessibleObject are not overridden. */
|
51
|
207 |
public Field newField(Class<?> declaringClass,
|
2
|
208 |
String name,
|
51
|
209 |
Class<?> type,
|
2
|
210 |
int modifiers,
|
|
211 |
int slot,
|
|
212 |
String signature,
|
|
213 |
byte[] annotations)
|
|
214 |
{
|
|
215 |
return langReflectAccess().newField(declaringClass,
|
|
216 |
name,
|
|
217 |
type,
|
|
218 |
modifiers,
|
|
219 |
slot,
|
|
220 |
signature,
|
|
221 |
annotations);
|
|
222 |
}
|
|
223 |
|
|
224 |
/** Creates a new java.lang.reflect.Method. Access checks as per
|
|
225 |
java.lang.reflect.AccessibleObject are not overridden. */
|
51
|
226 |
public Method newMethod(Class<?> declaringClass,
|
2
|
227 |
String name,
|
51
|
228 |
Class<?>[] parameterTypes,
|
|
229 |
Class<?> returnType,
|
|
230 |
Class<?>[] checkedExceptions,
|
2
|
231 |
int modifiers,
|
|
232 |
int slot,
|
|
233 |
String signature,
|
|
234 |
byte[] annotations,
|
|
235 |
byte[] parameterAnnotations,
|
|
236 |
byte[] annotationDefault)
|
|
237 |
{
|
|
238 |
return langReflectAccess().newMethod(declaringClass,
|
|
239 |
name,
|
|
240 |
parameterTypes,
|
|
241 |
returnType,
|
|
242 |
checkedExceptions,
|
|
243 |
modifiers,
|
|
244 |
slot,
|
|
245 |
signature,
|
|
246 |
annotations,
|
|
247 |
parameterAnnotations,
|
|
248 |
annotationDefault);
|
|
249 |
}
|
|
250 |
|
|
251 |
/** Creates a new java.lang.reflect.Constructor. Access checks as
|
|
252 |
per java.lang.reflect.AccessibleObject are not overridden. */
|
51
|
253 |
public Constructor newConstructor(Class<?> declaringClass,
|
|
254 |
Class<?>[] parameterTypes,
|
|
255 |
Class<?>[] checkedExceptions,
|
2
|
256 |
int modifiers,
|
|
257 |
int slot,
|
|
258 |
String signature,
|
|
259 |
byte[] annotations,
|
|
260 |
byte[] parameterAnnotations)
|
|
261 |
{
|
|
262 |
return langReflectAccess().newConstructor(declaringClass,
|
|
263 |
parameterTypes,
|
|
264 |
checkedExceptions,
|
|
265 |
modifiers,
|
|
266 |
slot,
|
|
267 |
signature,
|
|
268 |
annotations,
|
|
269 |
parameterAnnotations);
|
|
270 |
}
|
|
271 |
|
|
272 |
/** Gets the MethodAccessor object for a java.lang.reflect.Method */
|
|
273 |
public MethodAccessor getMethodAccessor(Method m) {
|
|
274 |
return langReflectAccess().getMethodAccessor(m);
|
|
275 |
}
|
|
276 |
|
|
277 |
/** Sets the MethodAccessor object for a java.lang.reflect.Method */
|
|
278 |
public void setMethodAccessor(Method m, MethodAccessor accessor) {
|
|
279 |
langReflectAccess().setMethodAccessor(m, accessor);
|
|
280 |
}
|
|
281 |
|
|
282 |
/** Gets the ConstructorAccessor object for a
|
|
283 |
java.lang.reflect.Constructor */
|
|
284 |
public ConstructorAccessor getConstructorAccessor(Constructor c) {
|
|
285 |
return langReflectAccess().getConstructorAccessor(c);
|
|
286 |
}
|
|
287 |
|
|
288 |
/** Sets the ConstructorAccessor object for a
|
|
289 |
java.lang.reflect.Constructor */
|
|
290 |
public void setConstructorAccessor(Constructor c,
|
|
291 |
ConstructorAccessor accessor)
|
|
292 |
{
|
|
293 |
langReflectAccess().setConstructorAccessor(c, accessor);
|
|
294 |
}
|
|
295 |
|
|
296 |
/** Makes a copy of the passed method. The returned method is a
|
|
297 |
"child" of the passed one; see the comments in Method.java for
|
|
298 |
details. */
|
|
299 |
public Method copyMethod(Method arg) {
|
|
300 |
return langReflectAccess().copyMethod(arg);
|
|
301 |
}
|
|
302 |
|
|
303 |
/** Makes a copy of the passed field. The returned field is a
|
|
304 |
"child" of the passed one; see the comments in Field.java for
|
|
305 |
details. */
|
|
306 |
public Field copyField(Field arg) {
|
|
307 |
return langReflectAccess().copyField(arg);
|
|
308 |
}
|
|
309 |
|
|
310 |
/** Makes a copy of the passed constructor. The returned
|
|
311 |
constructor is a "child" of the passed one; see the comments
|
|
312 |
in Constructor.java for details. */
|
51
|
313 |
public <T> Constructor<T> copyConstructor(Constructor<T> arg) {
|
2
|
314 |
return langReflectAccess().copyConstructor(arg);
|
|
315 |
}
|
|
316 |
|
|
317 |
//--------------------------------------------------------------------------
|
|
318 |
//
|
|
319 |
// Routines used by serialization
|
|
320 |
//
|
|
321 |
//
|
|
322 |
|
|
323 |
public Constructor newConstructorForSerialization
|
51
|
324 |
(Class<?> classToInstantiate, Constructor constructorToCall)
|
2
|
325 |
{
|
|
326 |
// Fast path
|
|
327 |
if (constructorToCall.getDeclaringClass() == classToInstantiate) {
|
|
328 |
return constructorToCall;
|
|
329 |
}
|
|
330 |
|
|
331 |
ConstructorAccessor acc = new MethodAccessorGenerator().
|
|
332 |
generateSerializationConstructor(classToInstantiate,
|
|
333 |
constructorToCall.getParameterTypes(),
|
|
334 |
constructorToCall.getExceptionTypes(),
|
|
335 |
constructorToCall.getModifiers(),
|
|
336 |
constructorToCall.getDeclaringClass());
|
|
337 |
Constructor c = newConstructor(constructorToCall.getDeclaringClass(),
|
|
338 |
constructorToCall.getParameterTypes(),
|
|
339 |
constructorToCall.getExceptionTypes(),
|
|
340 |
constructorToCall.getModifiers(),
|
|
341 |
langReflectAccess().
|
|
342 |
getConstructorSlot(constructorToCall),
|
|
343 |
langReflectAccess().
|
|
344 |
getConstructorSignature(constructorToCall),
|
|
345 |
langReflectAccess().
|
|
346 |
getConstructorAnnotations(constructorToCall),
|
|
347 |
langReflectAccess().
|
|
348 |
getConstructorParameterAnnotations(constructorToCall));
|
|
349 |
setConstructorAccessor(c, acc);
|
|
350 |
return c;
|
|
351 |
}
|
|
352 |
|
|
353 |
//--------------------------------------------------------------------------
|
|
354 |
//
|
|
355 |
// Internals only below this point
|
|
356 |
//
|
|
357 |
|
|
358 |
static int inflationThreshold() {
|
|
359 |
return inflationThreshold;
|
|
360 |
}
|
|
361 |
|
|
362 |
/** We have to defer full initialization of this class until after
|
|
363 |
the static initializer is run since java.lang.reflect.Method's
|
|
364 |
static initializer (more properly, that for
|
|
365 |
java.lang.reflect.AccessibleObject) causes this class's to be
|
|
366 |
run, before the system properties are set up. */
|
|
367 |
private static void checkInitted() {
|
|
368 |
if (initted) return;
|
51
|
369 |
AccessController.doPrivileged(
|
|
370 |
new PrivilegedAction<Void>() {
|
|
371 |
public Void run() {
|
2
|
372 |
// Tests to ensure the system properties table is fully
|
|
373 |
// initialized. This is needed because reflection code is
|
|
374 |
// called very early in the initialization process (before
|
|
375 |
// command-line arguments have been parsed and therefore
|
|
376 |
// these user-settable properties installed.) We assume that
|
|
377 |
// if System.out is non-null then the System class has been
|
|
378 |
// fully initialized and that the bulk of the startup code
|
|
379 |
// has been run.
|
|
380 |
|
|
381 |
if (System.out == null) {
|
|
382 |
// java.lang.System not yet fully initialized
|
|
383 |
return null;
|
|
384 |
}
|
|
385 |
|
|
386 |
String val = System.getProperty("sun.reflect.noInflation");
|
|
387 |
if (val != null && val.equals("true")) {
|
|
388 |
noInflation = true;
|
|
389 |
}
|
|
390 |
|
|
391 |
val = System.getProperty("sun.reflect.inflationThreshold");
|
|
392 |
if (val != null) {
|
|
393 |
try {
|
|
394 |
inflationThreshold = Integer.parseInt(val);
|
|
395 |
} catch (NumberFormatException e) {
|
|
396 |
throw (RuntimeException)
|
|
397 |
new RuntimeException("Unable to parse property sun.reflect.inflationThreshold").
|
|
398 |
initCause(e);
|
|
399 |
}
|
|
400 |
}
|
|
401 |
|
|
402 |
initted = true;
|
|
403 |
return null;
|
|
404 |
}
|
|
405 |
});
|
|
406 |
}
|
|
407 |
|
|
408 |
private static LangReflectAccess langReflectAccess() {
|
|
409 |
if (langReflectAccess == null) {
|
|
410 |
// Call a static method to get class java.lang.reflect.Modifier
|
|
411 |
// initialized. Its static initializer will cause
|
|
412 |
// setLangReflectAccess() to be called from the context of the
|
|
413 |
// java.lang.reflect package.
|
|
414 |
Modifier.isPublic(Modifier.PUBLIC);
|
|
415 |
}
|
|
416 |
return langReflectAccess;
|
|
417 |
}
|
|
418 |
}
|