1 /*
2 * Copyright (c) 2001, 2018, 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 jdk.internal.reflect;
27
28 import java.io.Externalizable;
29 import java.io.ObjectInputStream;
30 import java.io.ObjectOutputStream;
31 import java.io.ObjectStreamClass;
32 import java.io.OptionalDataException;
33 import java.io.Serializable;
34 import java.lang.invoke.MethodHandle;
35 import java.lang.invoke.MethodHandles;
36 import java.lang.reflect.Field;
37 import java.lang.reflect.Executable;
38 import java.lang.reflect.InvocationTargetException;
39 import java.lang.reflect.Method;
40 import java.lang.reflect.Constructor;
41 import java.lang.reflect.Modifier;
42 import java.security.PrivilegedAction;
43 import java.util.Objects;
44 import java.util.Properties;
45
46 import jdk.internal.misc.VM;
47 import sun.reflect.misc.ReflectUtil;
48 import sun.security.action.GetPropertyAction;
49 import sun.security.util.SecurityConstants;
50
51 /** <P> The master factory for all reflective objects, both those in
52 java.lang.reflect (Fields, Methods, Constructors) as well as their
53 delegates (FieldAccessors, MethodAccessors, ConstructorAccessors).
54 </P>
55
56 <P> The methods in this class are extremely unsafe and can cause
57 subversion of both the language and the verifier. For this reason,
58 they are all instance methods, and access to the constructor of
59 this factory is guarded by a security check, in similar style to
60 {@link jdk.internal.misc.Unsafe}. </P>
61 */
62
63 public class ReflectionFactory {
64
65 private static boolean initted = false;
66 private static final ReflectionFactory soleInstance = new ReflectionFactory();
67 // Provides access to package-private mechanisms in java.lang.reflect
68 private static volatile LangReflectAccess langReflectAccess;
69
70 /* Method for static class initializer <clinit>, or null */
71 private static volatile Method hasStaticInitializerMethod;
72
73 //
74 // "Inflation" mechanism. Loading bytecodes to implement
75 // Method.invoke() and Constructor.newInstance() currently costs
76 // 3-4x more than an invocation via native code for the first
77 // invocation (though subsequent invocations have been benchmarked
78 // to be over 20x faster). Unfortunately this cost increases
79 // startup time for certain applications that use reflection
80 // intensively (but only once per class) to bootstrap themselves.
81 // To avoid this penalty we reuse the existing JVM entry points
82 // for the first few invocations of Methods and Constructors and
83 // then switch to the bytecode-based implementations.
84 //
85 // Package-private to be accessible to NativeMethodAccessorImpl
86 // and NativeConstructorAccessorImpl
87 private static boolean noInflation = false;
88 private static int inflationThreshold = 15;
89
90 // true if deserialization constructor checking is disabled
91 private static boolean disableSerialConstructorChecks = false;
92
93 private ReflectionFactory() {
94 }
95
96 /**
97 * A convenience class for acquiring the capability to instantiate
98 * reflective objects. Use this instead of a raw call to {@link
99 * #getReflectionFactory} in order to avoid being limited by the
100 * permissions of your callers.
101 *
102 * <p>An instance of this class can be used as the argument of
103 * <code>AccessController.doPrivileged</code>.
104 */
105 public static final class GetReflectionFactoryAction
106 implements PrivilegedAction<ReflectionFactory> {
107 public ReflectionFactory run() {
108 return getReflectionFactory();
109 }
110 }
111
112 /**
113 * Provides the caller with the capability to instantiate reflective
114 * objects.
115 *
116 * <p> First, if there is a security manager, its
117 * <code>checkPermission</code> method is called with a {@link
118 * java.lang.RuntimePermission} with target
119 * <code>"reflectionFactoryAccess"</code>. This may result in a
120 * security exception.
121 *
122 * <p> The returned <code>ReflectionFactory</code> object should be
123 * carefully guarded by the caller, since it can be used to read and
124 * write private data and invoke private methods, as well as to load
125 * unverified bytecodes. It must never be passed to untrusted code.
126 *
127 * @exception SecurityException if a security manager exists and its
128 * <code>checkPermission</code> method doesn't allow
129 * access to the RuntimePermission "reflectionFactoryAccess". */
130 public static ReflectionFactory getReflectionFactory() {
131 SecurityManager security = System.getSecurityManager();
132 if (security != null) {
133 security.checkPermission(
134 SecurityConstants.REFLECTION_FACTORY_ACCESS_PERMISSION);
135 }
136 return soleInstance;
137 }
138
139 /**
140 * Returns an alternate reflective Method instance for the given method
141 * intended for reflection to invoke, if present.
142 *
143 * A trusted method can define an alternate implementation for a method `foo`
144 * by defining a method named "reflected$foo" that will be invoked
145 * reflectively.
146 */
147 private static Method findMethodForReflection(Method method) {
148 String altName = "reflected$" + method.getName();
149 try {
150 return method.getDeclaringClass()
151 .getDeclaredMethod(altName, method.getParameterTypes());
152 } catch (NoSuchMethodException ex) {
153 return null;
154 }
155 }
156
157 //--------------------------------------------------------------------------
158 //
159 // Routines used by java.lang.reflect
160 //
161 //
162
163 /** Called only by java.lang.reflect.Modifier's static initializer */
164 public void setLangReflectAccess(LangReflectAccess access) {
165 langReflectAccess = access;
166 }
167
168 /**
169 * Note: this routine can cause the declaring class for the field
170 * be initialized and therefore must not be called until the
171 * first get/set of this field.
172 * @param field the field
173 * @param override true if caller has overridden accessibility
174 */
175 public FieldAccessor newFieldAccessor(Field field, boolean override) {
176 checkInitted();
177
178 Field root = langReflectAccess.getRoot(field);
179 if (root != null) {
180 // FieldAccessor will use the root unless the modifiers have
181 // been overrridden
182 if (root.getModifiers() == field.getModifiers() || !override) {
183 field = root;
184 }
185 }
186 return UnsafeFieldAccessorFactory.newFieldAccessor(field, override);
187 }
188
189 public MethodAccessor newMethodAccessor(Method method) {
190 checkInitted();
191
192 if (Reflection.isCallerSensitive(method)) {
193 Method altMethod = findMethodForReflection(method);
194 if (altMethod != null) {
195 method = altMethod;
196 }
197 }
198
199 // use the root Method that will not cache caller class
200 Method root = langReflectAccess.getRoot(method);
201 if (root != null) {
202 method = root;
203 }
204
205 if (noInflation && !ReflectUtil.isVMAnonymousClass(method.getDeclaringClass())) {
206 return new MethodAccessorGenerator().
207 generateMethod(method.getDeclaringClass(),
208 method.getName(),
209 method.getParameterTypes(),
210 method.getReturnType(),
211 method.getExceptionTypes(),
212 method.getModifiers());
213 } else {
214 NativeMethodAccessorImpl acc =
215 new NativeMethodAccessorImpl(method);
216 DelegatingMethodAccessorImpl res =
217 new DelegatingMethodAccessorImpl(acc);
218 acc.setParent(res);
219 return res;
220 }
221 }
222
223 public ConstructorAccessor newConstructorAccessor(Constructor<?> c) {
224 checkInitted();
225
226 Class<?> declaringClass = c.getDeclaringClass();
227 if (Modifier.isAbstract(declaringClass.getModifiers())) {
228 return new InstantiationExceptionConstructorAccessorImpl(null);
229 }
230 if (declaringClass == Class.class) {
231 return new InstantiationExceptionConstructorAccessorImpl
232 ("Can not instantiate java.lang.Class");
233 }
234
235 // use the root Constructor that will not cache caller class
236 Constructor<?> root = langReflectAccess.getRoot(c);
237 if (root != null) {
238 c = root;
239 }
240
241 // Bootstrapping issue: since we use Class.newInstance() in
242 // the ConstructorAccessor generation process, we have to
243 // break the cycle here.
244 if (Reflection.isSubclassOf(declaringClass,
245 ConstructorAccessorImpl.class)) {
246 return new BootstrapConstructorAccessorImpl(c);
247 }
248
249 if (noInflation && !ReflectUtil.isVMAnonymousClass(c.getDeclaringClass())) {
250 return new MethodAccessorGenerator().
251 generateConstructor(c.getDeclaringClass(),
252 c.getParameterTypes(),
253 c.getExceptionTypes(),
254 c.getModifiers());
255 } else {
256 NativeConstructorAccessorImpl acc =
257 new NativeConstructorAccessorImpl(c);
258 DelegatingConstructorAccessorImpl res =
259 new DelegatingConstructorAccessorImpl(acc);
260 acc.setParent(res);
261 return res;
262 }
263 }
264
265 //--------------------------------------------------------------------------
266 //
267 // Routines used by java.lang
268 //
269 //
270
271 /** Creates a new java.lang.reflect.Field. Access checks as per
272 java.lang.reflect.AccessibleObject are not overridden. */
273 public Field newField(Class<?> declaringClass,
274 String name,
275 Class<?> type,
276 int modifiers,
277 int slot,
278 String signature,
279 byte[] annotations)
280 {
281 return langReflectAccess().newField(declaringClass,
282 name,
283 type,
284 modifiers,
285 slot,
286 signature,
287 annotations);
288 }
289
290 /** Creates a new java.lang.reflect.Method. Access checks as per
291 java.lang.reflect.AccessibleObject are not overridden. */
292 public Method newMethod(Class<?> declaringClass,
293 String name,
294 Class<?>[] parameterTypes,
295 Class<?> returnType,
296 Class<?>[] checkedExceptions,
297 int modifiers,
298 int slot,
299 String signature,
300 byte[] annotations,
301 byte[] parameterAnnotations,
302 byte[] annotationDefault)
303 {
304 return langReflectAccess().newMethod(declaringClass,
305 name,
306 parameterTypes,
307 returnType,
308 checkedExceptions,
309 modifiers,
310 slot,
311 signature,
312 annotations,
313 parameterAnnotations,
314 annotationDefault);
315 }
316
317 /** Creates a new java.lang.reflect.Constructor. Access checks as
318 per java.lang.reflect.AccessibleObject are not overridden. */
319 public Constructor<?> newConstructor(Class<?> declaringClass,
320 Class<?>[] parameterTypes,
321 Class<?>[] checkedExceptions,
322 int modifiers,
323 int slot,
324 String signature,
325 byte[] annotations,
326 byte[] parameterAnnotations)
327 {
328 return langReflectAccess().newConstructor(declaringClass,
329 parameterTypes,
330 checkedExceptions,
331 modifiers,
332 slot,
333 signature,
334 annotations,
335 parameterAnnotations);
336 }
337
338 /** Gets the MethodAccessor object for a java.lang.reflect.Method */
339 public MethodAccessor getMethodAccessor(Method m) {
340 return langReflectAccess().getMethodAccessor(m);
341 }
342
343 /** Sets the MethodAccessor object for a java.lang.reflect.Method */
344 public void setMethodAccessor(Method m, MethodAccessor accessor) {
345 langReflectAccess().setMethodAccessor(m, accessor);
346 }
347
348 /** Gets the ConstructorAccessor object for a
349 java.lang.reflect.Constructor */
350 public ConstructorAccessor getConstructorAccessor(Constructor<?> c) {
351 return langReflectAccess().getConstructorAccessor(c);
352 }
353
354 /** Sets the ConstructorAccessor object for a
355 java.lang.reflect.Constructor */
356 public void setConstructorAccessor(Constructor<?> c,
357 ConstructorAccessor accessor)
358 {
359 langReflectAccess().setConstructorAccessor(c, accessor);
360 }
361
362 /** Makes a copy of the passed method. The returned method is a
363 "child" of the passed one; see the comments in Method.java for
364 details. */
365 public Method copyMethod(Method arg) {
366 return langReflectAccess().copyMethod(arg);
367 }
368
369 /** Makes a copy of the passed method. The returned method is NOT
370 * a "child" but a "sibling" of the Method in arg. Should only be
371 * used on non-root methods. */
372 public Method leafCopyMethod(Method arg) {
373 return langReflectAccess().leafCopyMethod(arg);
374 }
375
376
377 /** Makes a copy of the passed field. The returned field is a
378 "child" of the passed one; see the comments in Field.java for
379 details. */
380 public Field copyField(Field arg) {
381 return langReflectAccess().copyField(arg);
382 }
383
384 /** Makes a copy of the passed constructor. The returned
385 constructor is a "child" of the passed one; see the comments
386 in Constructor.java for details. */
387 public <T> Constructor<T> copyConstructor(Constructor<T> arg) {
388 return langReflectAccess().copyConstructor(arg);
389 }
390
391 /** Gets the byte[] that encodes TypeAnnotations on an executable.
392 */
393 public byte[] getExecutableTypeAnnotationBytes(Executable ex) {
394 return langReflectAccess().getExecutableTypeAnnotationBytes(ex);
395 }
396
397 public Class<?>[] getExecutableSharedParameterTypes(Executable ex) {
398 return langReflectAccess().getExecutableSharedParameterTypes(ex);
399 }
400
401 //--------------------------------------------------------------------------
402 //
403 // Routines used by serialization
404 //
405 //
406
407 public final Constructor<?> newConstructorForExternalization(Class<?> cl) {
408 if (!Externalizable.class.isAssignableFrom(cl)) {
409 return null;
410 }
411 try {
412 Constructor<?> cons = cl.getConstructor();
413 cons.setAccessible(true);
414 return cons;
415 } catch (NoSuchMethodException ex) {
416 return null;
417 }
418 }
419
420 public final Constructor<?> newConstructorForSerialization(Class<?> cl,
421 Constructor<?> constructorToCall)
422 {
423 if (constructorToCall.getDeclaringClass() == cl) {
424 constructorToCall.setAccessible(true);
425 return constructorToCall;
426 }
427 return generateConstructor(cl, constructorToCall);
428 }
429
430 /**
431 * Given a class, determines whether its superclass has
432 * any constructors that are accessible from the class.
433 * This is a special purpose method intended to do access
434 * checking for a serializable class and its superclasses
435 * up to, but not including, the first non-serializable
436 * superclass. This also implies that the superclass is
437 * always non-null, because a serializable class must be a
438 * class (not an interface) and Object is not serializable.
439 *
440 * @param cl the class from which access is checked
441 * @return whether the superclass has a constructor accessible from cl
442 */
443 private boolean superHasAccessibleConstructor(Class<?> cl) {
444 Class<?> superCl = cl.getSuperclass();
445 assert Serializable.class.isAssignableFrom(cl);
446 assert superCl != null;
447 if (packageEquals(cl, superCl)) {
448 // accessible if any non-private constructor is found
449 for (Constructor<?> ctor : superCl.getDeclaredConstructors()) {
450 if ((ctor.getModifiers() & Modifier.PRIVATE) == 0) {
451 return true;
452 }
453 }
454 if (Reflection.areNestMates(cl, superCl)) {
455 return true;
456 }
457 return false;
458 } else {
459 // sanity check to ensure the parent is protected or public
460 if ((superCl.getModifiers() & (Modifier.PROTECTED | Modifier.PUBLIC)) == 0) {
461 return false;
462 }
463 // accessible if any constructor is protected or public
464 for (Constructor<?> ctor : superCl.getDeclaredConstructors()) {
465 if ((ctor.getModifiers() & (Modifier.PROTECTED | Modifier.PUBLIC)) != 0) {
466 return true;
467 }
468 }
469 return false;
470 }
471 }
472
473 /**
474 * Returns a constructor that allocates an instance of cl and that then initializes
475 * the instance by calling the no-arg constructor of its first non-serializable
476 * superclass. This is specified in the Serialization Specification, section 3.1,
477 * in step 11 of the deserialization process. If cl is not serializable, returns
478 * cl's no-arg constructor. If no accessible constructor is found, or if the
479 * class hierarchy is somehow malformed (e.g., a serializable class has no
480 * superclass), null is returned.
481 *
482 * @param cl the class for which a constructor is to be found
483 * @return the generated constructor, or null if none is available
484 */
485 public final Constructor<?> newConstructorForSerialization(Class<?> cl) {
486 Class<?> initCl = cl;
487 while (Serializable.class.isAssignableFrom(initCl)) {
488 Class<?> prev = initCl;
489 if ((initCl = initCl.getSuperclass()) == null ||
490 (!disableSerialConstructorChecks && !superHasAccessibleConstructor(prev))) {
491 return null;
492 }
493 }
494 Constructor<?> constructorToCall;
495 try {
496 constructorToCall = initCl.getDeclaredConstructor();
497 int mods = constructorToCall.getModifiers();
498 if ((mods & Modifier.PRIVATE) != 0 ||
499 ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) == 0 &&
500 !packageEquals(cl, initCl))) {
501 return null;
502 }
503 } catch (NoSuchMethodException ex) {
504 return null;
505 }
506 return generateConstructor(cl, constructorToCall);
507 }
508
509 private final Constructor<?> generateConstructor(Class<?> cl,
510 Constructor<?> constructorToCall) {
511
512
513 ConstructorAccessor acc = new MethodAccessorGenerator().
514 generateSerializationConstructor(cl,
515 constructorToCall.getParameterTypes(),
516 constructorToCall.getExceptionTypes(),
517 constructorToCall.getModifiers(),
518 constructorToCall.getDeclaringClass());
519 Constructor<?> c = newConstructor(constructorToCall.getDeclaringClass(),
520 constructorToCall.getParameterTypes(),
521 constructorToCall.getExceptionTypes(),
522 constructorToCall.getModifiers(),
523 langReflectAccess().
524 getConstructorSlot(constructorToCall),
525 langReflectAccess().
526 getConstructorSignature(constructorToCall),
527 langReflectAccess().
528 getConstructorAnnotations(constructorToCall),
529 langReflectAccess().
530 getConstructorParameterAnnotations(constructorToCall));
531 setConstructorAccessor(c, acc);
532 c.setAccessible(true);
533 return c;
534 }
535
536 public final MethodHandle readObjectForSerialization(Class<?> cl) {
537 return findReadWriteObjectForSerialization(cl, "readObject", ObjectInputStream.class);
538 }
539
540 public final MethodHandle readObjectNoDataForSerialization(Class<?> cl) {
541 return findReadWriteObjectForSerialization(cl, "readObjectNoData", ObjectInputStream.class);
542 }
543
544 public final MethodHandle writeObjectForSerialization(Class<?> cl) {
545 return findReadWriteObjectForSerialization(cl, "writeObject", ObjectOutputStream.class);
546 }
547
548 private final MethodHandle findReadWriteObjectForSerialization(Class<?> cl,
549 String methodName,
550 Class<?> streamClass) {
551 if (!Serializable.class.isAssignableFrom(cl)) {
552 return null;
553 }
554
555 try {
556 Method meth = cl.getDeclaredMethod(methodName, streamClass);
557 int mods = meth.getModifiers();
558 if (meth.getReturnType() != Void.TYPE ||
559 Modifier.isStatic(mods) ||
560 !Modifier.isPrivate(mods)) {
561 return null;
562 }
563 meth.setAccessible(true);
564 return MethodHandles.lookup().unreflect(meth);
565 } catch (NoSuchMethodException ex) {
566 return null;
567 } catch (IllegalAccessException ex1) {
568 throw new InternalError("Error", ex1);
569 }
570 }
571
572 /**
573 * Returns a MethodHandle for {@code writeReplace} on the serializable class
574 * or null if no match found.
575 * @param cl a serializable class
576 * @returnss the {@code writeReplace} MethodHandle or {@code null} if not found
577 */
578 public final MethodHandle writeReplaceForSerialization(Class<?> cl) {
579 return getReplaceResolveForSerialization(cl, "writeReplace");
580 }
581
582 /**
583 * Returns a MethodHandle for {@code readResolve} on the serializable class
584 * or null if no match found.
585 * @param cl a serializable class
586 * @returns the {@code writeReplace} MethodHandle or {@code null} if not found
587 */
588 public final MethodHandle readResolveForSerialization(Class<?> cl) {
589 return getReplaceResolveForSerialization(cl, "readResolve");
590 }
591
592 /**
593 * Lookup readResolve or writeReplace on a class with specified
594 * signature constraints.
595 * @param cl a serializable class
596 * @param methodName the method name to find
597 * @returns a MethodHandle for the method or {@code null} if not found or
598 * has the wrong signature.
599 */
600 private MethodHandle getReplaceResolveForSerialization(Class<?> cl,
601 String methodName) {
602 if (!Serializable.class.isAssignableFrom(cl)) {
603 return null;
604 }
605
606 Class<?> defCl = cl;
607 while (defCl != null) {
608 try {
609 Method m = defCl.getDeclaredMethod(methodName);
610 if (m.getReturnType() != Object.class) {
611 return null;
612 }
613 int mods = m.getModifiers();
614 if (Modifier.isStatic(mods) | Modifier.isAbstract(mods)) {
615 return null;
616 } else if (Modifier.isPublic(mods) | Modifier.isProtected(mods)) {
617 // fall through
618 } else if (Modifier.isPrivate(mods) && (cl != defCl)) {
619 return null;
620 } else if (!packageEquals(cl, defCl)) {
621 return null;
622 }
623 try {
624 // Normal return
625 m.setAccessible(true);
626 return MethodHandles.lookup().unreflect(m);
627 } catch (IllegalAccessException ex0) {
628 // setAccessible should prevent IAE
629 throw new InternalError("Error", ex0);
630 }
631 } catch (NoSuchMethodException ex) {
632 defCl = defCl.getSuperclass();
633 }
634 }
635 return null;
636 }
637
638 /**
639 * Returns true if the given class defines a static initializer method,
640 * false otherwise.
641 */
642 public final boolean hasStaticInitializerForSerialization(Class<?> cl) {
643 Method m = hasStaticInitializerMethod;
644 if (m == null) {
645 try {
646 m = ObjectStreamClass.class.getDeclaredMethod("hasStaticInitializer",
647 new Class<?>[]{Class.class});
648 m.setAccessible(true);
649 hasStaticInitializerMethod = m;
650 } catch (NoSuchMethodException ex) {
651 throw new InternalError("No such method hasStaticInitializer on "
652 + ObjectStreamClass.class, ex);
653 }
654 }
655 try {
656 return (Boolean) m.invoke(null, cl);
657 } catch (InvocationTargetException | IllegalAccessException ex) {
658 throw new InternalError("Exception invoking hasStaticInitializer", ex);
659 }
660 }
661
662 /**
663 * Return the accessible constructor for OptionalDataException signaling eof.
664 * @returns the eof constructor for OptionalDataException
665 */
666 public final Constructor<OptionalDataException> newOptionalDataExceptionForSerialization() {
667 try {
668 Constructor<OptionalDataException> boolCtor =
669 OptionalDataException.class.getDeclaredConstructor(Boolean.TYPE);
670 boolCtor.setAccessible(true);
671 return boolCtor;
672 } catch (NoSuchMethodException ex) {
673 throw new InternalError("Constructor not found", ex);
674 }
675 }
676
677 //--------------------------------------------------------------------------
678 //
679 // Internals only below this point
680 //
681
682 static int inflationThreshold() {
683 return inflationThreshold;
684 }
685
686 /** We have to defer full initialization of this class until after
687 the static initializer is run since java.lang.reflect.Method's
688 static initializer (more properly, that for
689 java.lang.reflect.AccessibleObject) causes this class's to be
690 run, before the system properties are set up. */
691 private static void checkInitted() {
692 if (initted) return;
693
694 // Defer initialization until module system is initialized so as
695 // to avoid inflation and spinning bytecode in unnamed modules
696 // during early startup.
697 if (!VM.isModuleSystemInited()) {
698 return;
699 }
700
701 Properties props = GetPropertyAction.privilegedGetProperties();
702 String val = props.getProperty("sun.reflect.noInflation");
703 if (val != null && val.equals("true")) {
704 noInflation = true;
705 }
706
707 val = props.getProperty("sun.reflect.inflationThreshold");
708 if (val != null) {
709 try {
710 inflationThreshold = Integer.parseInt(val);
711 } catch (NumberFormatException e) {
712 throw new RuntimeException("Unable to parse property sun.reflect.inflationThreshold", e);
713 }
714 }
715
716 disableSerialConstructorChecks =
717 "true".equals(props.getProperty("jdk.disableSerialConstructorChecks"));
718
719 initted = true;
720 }
721
722 private static LangReflectAccess langReflectAccess() {
723 if (langReflectAccess == null) {
724 // Call a static method to get class java.lang.reflect.Modifier
725 // initialized. Its static initializer will cause
726 // setLangReflectAccess() to be called from the context of the
727 // java.lang.reflect package.
728 Modifier.isPublic(Modifier.PUBLIC);
729 }
730 return langReflectAccess;
731 }
732
733 /**
734 * Returns true if classes are defined in the classloader and same package, false
735 * otherwise.
736 * @param cl1 a class
737 * @param cl2 another class
738 * @returns true if the two classes are in the same classloader and package
739 */
740 private static boolean packageEquals(Class<?> cl1, Class<?> cl2) {
741 assert !cl1.isArray() && !cl2.isArray();
742
743 if (cl1 == cl2) {
744 return true;
745 }
746
747 return cl1.getClassLoader() == cl2.getClassLoader() &&
748 Objects.equals(cl1.getPackageName(), cl2.getPackageName());
749 }
750
751 }