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 return false;
455 } else {
456 // sanity check to ensure the parent is protected or public
457 if ((superCl.getModifiers() & (Modifier.PROTECTED | Modifier.PUBLIC)) == 0) {
458 return false;
459 }
460 // accessible if any constructor is protected or public
461 for (Constructor<?> ctor : superCl.getDeclaredConstructors()) {
462 if ((ctor.getModifiers() & (Modifier.PROTECTED | Modifier.PUBLIC)) != 0) {
463 return true;
464 }
465 }
466 return false;
467 }
468 }
469
470 /**
471 * Returns a constructor that allocates an instance of cl and that then initializes
472 * the instance by calling the no-arg constructor of its first non-serializable
473 * superclass. This is specified in the Serialization Specification, section 3.1,
474 * in step 11 of the deserialization process. If cl is not serializable, returns
475 * cl's no-arg constructor. If no accessible constructor is found, or if the
476 * class hierarchy is somehow malformed (e.g., a serializable class has no
477 * superclass), null is returned.
478 *
479 * @param cl the class for which a constructor is to be found
480 * @return the generated constructor, or null if none is available
481 */
482 public final Constructor<?> newConstructorForSerialization(Class<?> cl) {
483 Class<?> initCl = cl;
484 while (Serializable.class.isAssignableFrom(initCl)) {
485 Class<?> prev = initCl;
486 if ((initCl = initCl.getSuperclass()) == null ||
487 (!disableSerialConstructorChecks && !superHasAccessibleConstructor(prev))) {
488 return null;
489 }
490 }
491 Constructor<?> constructorToCall;
492 try {
493 constructorToCall = initCl.getDeclaredConstructor();
494 int mods = constructorToCall.getModifiers();
495 if ((mods & Modifier.PRIVATE) != 0 ||
496 ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) == 0 &&
497 !packageEquals(cl, initCl))) {
498 return null;
499 }
500 } catch (NoSuchMethodException ex) {
501 return null;
502 }
503 return generateConstructor(cl, constructorToCall);
504 }
505
506 private final Constructor<?> generateConstructor(Class<?> cl,
507 Constructor<?> constructorToCall) {
508
509
510 ConstructorAccessor acc = new MethodAccessorGenerator().
511 generateSerializationConstructor(cl,
512 constructorToCall.getParameterTypes(),
513 constructorToCall.getExceptionTypes(),
514 constructorToCall.getModifiers(),
515 constructorToCall.getDeclaringClass());
516 Constructor<?> c = newConstructor(constructorToCall.getDeclaringClass(),
517 constructorToCall.getParameterTypes(),
518 constructorToCall.getExceptionTypes(),
519 constructorToCall.getModifiers(),
520 langReflectAccess().
521 getConstructorSlot(constructorToCall),
522 langReflectAccess().
523 getConstructorSignature(constructorToCall),
524 langReflectAccess().
525 getConstructorAnnotations(constructorToCall),
526 langReflectAccess().
527 getConstructorParameterAnnotations(constructorToCall));
528 setConstructorAccessor(c, acc);
529 c.setAccessible(true);
530 return c;
531 }
532
533 public final MethodHandle readObjectForSerialization(Class<?> cl) {
534 return findReadWriteObjectForSerialization(cl, "readObject", ObjectInputStream.class);
535 }
536
537 public final MethodHandle readObjectNoDataForSerialization(Class<?> cl) {
538 return findReadWriteObjectForSerialization(cl, "readObjectNoData", ObjectInputStream.class);
539 }
540
541 public final MethodHandle writeObjectForSerialization(Class<?> cl) {
542 return findReadWriteObjectForSerialization(cl, "writeObject", ObjectOutputStream.class);
543 }
544
545 private final MethodHandle findReadWriteObjectForSerialization(Class<?> cl,
546 String methodName,
547 Class<?> streamClass) {
548 if (!Serializable.class.isAssignableFrom(cl)) {
549 return null;
550 }
551
552 try {
553 Method meth = cl.getDeclaredMethod(methodName, streamClass);
554 int mods = meth.getModifiers();
555 if (meth.getReturnType() != Void.TYPE ||
556 Modifier.isStatic(mods) ||
557 !Modifier.isPrivate(mods)) {
558 return null;
559 }
560 meth.setAccessible(true);
561 return MethodHandles.lookup().unreflect(meth);
562 } catch (NoSuchMethodException ex) {
563 return null;
564 } catch (IllegalAccessException ex1) {
565 throw new InternalError("Error", ex1);
566 }
567 }
568
569 /**
570 * Returns a MethodHandle for {@code writeReplace} on the serializable class
571 * or null if no match found.
572 * @param cl a serializable class
573 * @returnss the {@code writeReplace} MethodHandle or {@code null} if not found
574 */
575 public final MethodHandle writeReplaceForSerialization(Class<?> cl) {
576 return getReplaceResolveForSerialization(cl, "writeReplace");
577 }
578
579 /**
580 * Returns a MethodHandle for {@code readResolve} on the serializable class
581 * or null if no match found.
582 * @param cl a serializable class
583 * @returns the {@code writeReplace} MethodHandle or {@code null} if not found
584 */
585 public final MethodHandle readResolveForSerialization(Class<?> cl) {
586 return getReplaceResolveForSerialization(cl, "readResolve");
587 }
588
589 /**
590 * Lookup readResolve or writeReplace on a class with specified
591 * signature constraints.
592 * @param cl a serializable class
593 * @param methodName the method name to find
594 * @returns a MethodHandle for the method or {@code null} if not found or
595 * has the wrong signature.
596 */
597 private MethodHandle getReplaceResolveForSerialization(Class<?> cl,
598 String methodName) {
599 if (!Serializable.class.isAssignableFrom(cl)) {
600 return null;
601 }
602
603 Class<?> defCl = cl;
604 while (defCl != null) {
605 try {
606 Method m = defCl.getDeclaredMethod(methodName);
607 if (m.getReturnType() != Object.class) {
608 return null;
609 }
610 int mods = m.getModifiers();
611 if (Modifier.isStatic(mods) | Modifier.isAbstract(mods)) {
612 return null;
613 } else if (Modifier.isPublic(mods) | Modifier.isProtected(mods)) {
614 // fall through
615 } else if (Modifier.isPrivate(mods) && (cl != defCl)) {
616 return null;
617 } else if (!packageEquals(cl, defCl)) {
618 return null;
619 }
620 try {
621 // Normal return
622 m.setAccessible(true);
623 return MethodHandles.lookup().unreflect(m);
624 } catch (IllegalAccessException ex0) {
625 // setAccessible should prevent IAE
626 throw new InternalError("Error", ex0);
627 }
628 } catch (NoSuchMethodException ex) {
629 defCl = defCl.getSuperclass();
630 }
631 }
632 return null;
633 }
634
635 /**
636 * Returns true if the given class defines a static initializer method,
637 * false otherwise.
638 */
639 public final boolean hasStaticInitializerForSerialization(Class<?> cl) {
640 Method m = hasStaticInitializerMethod;
641 if (m == null) {
642 try {
643 m = ObjectStreamClass.class.getDeclaredMethod("hasStaticInitializer",
644 new Class<?>[]{Class.class});
645 m.setAccessible(true);
646 hasStaticInitializerMethod = m;
647 } catch (NoSuchMethodException ex) {
648 throw new InternalError("No such method hasStaticInitializer on "
649 + ObjectStreamClass.class, ex);
650 }
651 }
652 try {
653 return (Boolean) m.invoke(null, cl);
654 } catch (InvocationTargetException | IllegalAccessException ex) {
655 throw new InternalError("Exception invoking hasStaticInitializer", ex);
656 }
657 }
658
659 /**
660 * Return the accessible constructor for OptionalDataException signaling eof.
661 * @returns the eof constructor for OptionalDataException
662 */
663 public final Constructor<OptionalDataException> newOptionalDataExceptionForSerialization() {
664 try {
665 Constructor<OptionalDataException> boolCtor =
666 OptionalDataException.class.getDeclaredConstructor(Boolean.TYPE);
667 boolCtor.setAccessible(true);
668 return boolCtor;
669 } catch (NoSuchMethodException ex) {
670 throw new InternalError("Constructor not found", ex);
671 }
672 }
673
674 //--------------------------------------------------------------------------
675 //
676 // Internals only below this point
677 //
678
679 static int inflationThreshold() {
680 return inflationThreshold;
681 }
682
683 /** We have to defer full initialization of this class until after
684 the static initializer is run since java.lang.reflect.Method's
685 static initializer (more properly, that for
686 java.lang.reflect.AccessibleObject) causes this class's to be
687 run, before the system properties are set up. */
688 private static void checkInitted() {
689 if (initted) return;
690
691 // Defer initialization until module system is initialized so as
692 // to avoid inflation and spinning bytecode in unnamed modules
693 // during early startup.
694 if (!VM.isModuleSystemInited()) {
695 return;
696 }
697
698 Properties props = GetPropertyAction.privilegedGetProperties();
699 String val = props.getProperty("sun.reflect.noInflation");
700 if (val != null && val.equals("true")) {
701 noInflation = true;
702 }
703
704 val = props.getProperty("sun.reflect.inflationThreshold");
705 if (val != null) {
706 try {
707 inflationThreshold = Integer.parseInt(val);
708 } catch (NumberFormatException e) {
709 throw new RuntimeException("Unable to parse property sun.reflect.inflationThreshold", e);
710 }
711 }
712
713 disableSerialConstructorChecks =
714 "true".equals(props.getProperty("jdk.disableSerialConstructorChecks"));
715
716 initted = true;
717 }
718
719 private static LangReflectAccess langReflectAccess() {
720 if (langReflectAccess == null) {
721 // Call a static method to get class java.lang.reflect.Modifier
722 // initialized. Its static initializer will cause
723 // setLangReflectAccess() to be called from the context of the
724 // java.lang.reflect package.
725 Modifier.isPublic(Modifier.PUBLIC);
726 }
727 return langReflectAccess;
728 }
729
730 /**
731 * Returns true if classes are defined in the classloader and same package, false
732 * otherwise.
733 * @param cl1 a class
734 * @param cl2 another class
735 * @returns true if the two classes are in the same classloader and package
736 */
737 private static boolean packageEquals(Class<?> cl1, Class<?> cl2) {
738 assert !cl1.isArray() && !cl2.isArray();
739
740 if (cl1 == cl2) {
741 return true;
742 }
743
744 return cl1.getClassLoader() == cl2.getClassLoader() &&
745 Objects.equals(cl1.getPackageName(), cl2.getPackageName());
746 }
747
748 }