1 /*
2 * Copyright (c) 1996, 2021, 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 java.io;
27
28 import java.lang.invoke.MethodHandle;
29 import java.lang.invoke.MethodHandles;
30 import java.lang.invoke.MethodType;
31 import java.lang.ref.Reference;
32 import java.lang.ref.ReferenceQueue;
33 import java.lang.ref.SoftReference;
34 import java.lang.ref.WeakReference;
35 import java.lang.reflect.Constructor;
36 import java.lang.reflect.Field;
37 import java.lang.reflect.InaccessibleObjectException;
38 import java.lang.reflect.InvocationTargetException;
39 import java.lang.reflect.RecordComponent;
40 import java.lang.reflect.UndeclaredThrowableException;
41 import java.lang.reflect.Member;
42 import java.lang.reflect.Method;
43 import java.lang.reflect.Modifier;
44 import java.lang.reflect.Proxy;
45 import java.security.AccessControlContext;
46 import java.security.AccessController;
47 import java.security.MessageDigest;
48 import java.security.NoSuchAlgorithmException;
49 import java.security.PermissionCollection;
50 import java.security.Permissions;
51 import java.security.PrivilegedAction;
52 import java.security.PrivilegedActionException;
53 import java.security.PrivilegedExceptionAction;
54 import java.security.ProtectionDomain;
55 import java.util.ArrayList;
56 import java.util.Arrays;
57 import java.util.Collections;
58 import java.util.Comparator;
59 import java.util.HashSet;
60 import java.util.Map;
61 import java.util.Set;
62 import java.util.concurrent.ConcurrentHashMap;
63 import java.util.concurrent.ConcurrentMap;
64 import jdk.internal.misc.Unsafe;
65 import jdk.internal.reflect.CallerSensitive;
66 import jdk.internal.reflect.Reflection;
67 import jdk.internal.reflect.ReflectionFactory;
68 import jdk.internal.access.SharedSecrets;
69 import jdk.internal.access.JavaSecurityAccess;
70 import sun.reflect.misc.ReflectUtil;
71 import static java.io.ObjectStreamField.*;
72
73 /**
74 * Serialization's descriptor for classes. It contains the name and
75 * serialVersionUID of the class. The ObjectStreamClass for a specific class
76 * loaded in this Java VM can be found/created using the lookup method.
77 *
78 * <p>The algorithm to compute the SerialVersionUID is described in
79 * <a href="{@docRoot}/../specs/serialization/class.html#stream-unique-identifiers">
80 * <cite>Java Object Serialization Specification,</cite> Section 4.6, "Stream Unique Identifiers"</a>.
81 *
82 * @author Mike Warres
83 * @author Roger Riggs
84 * @see ObjectStreamField
85 * @see <a href="{@docRoot}/../specs/serialization/class.html">
86 * <cite>Java Object Serialization Specification,</cite> Section 4, "Class Descriptors"</a>
87 * @since 1.1
88 */
89 public class ObjectStreamClass implements Serializable {
90
91 /** serialPersistentFields value indicating no serializable fields */
92 public static final ObjectStreamField[] NO_FIELDS =
93 new ObjectStreamField[0];
94
95 @java.io.Serial
96 private static final long serialVersionUID = -6120832682080437368L;
97 /**
98 * {@code ObjectStreamClass} has no fields for default serialization.
99 */
100 @java.io.Serial
101 private static final ObjectStreamField[] serialPersistentFields =
102 NO_FIELDS;
103
104 /** reflection factory for obtaining serialization constructors */
105 @SuppressWarnings("removal")
106 private static final ReflectionFactory reflFactory =
107 AccessController.doPrivileged(
108 new ReflectionFactory.GetReflectionFactoryAction());
109
110 private static class Caches {
111 /** cache mapping local classes -> descriptors */
112 static final ConcurrentMap<WeakClassKey,Reference<?>> localDescs =
113 new ConcurrentHashMap<>();
114
115 /** cache mapping field group/local desc pairs -> field reflectors */
116 static final ConcurrentMap<FieldReflectorKey,Reference<?>> reflectors =
117 new ConcurrentHashMap<>();
118
119 /** queue for WeakReferences to local classes */
120 private static final ReferenceQueue<Class<?>> localDescsQueue =
121 new ReferenceQueue<>();
122 /** queue for WeakReferences to field reflectors keys */
123 private static final ReferenceQueue<Class<?>> reflectorsQueue =
124 new ReferenceQueue<>();
125 }
126
127 /** class associated with this descriptor (if any) */
128 private Class<?> cl;
129 /** name of class represented by this descriptor */
130 private String name;
131 /** serialVersionUID of represented class (null if not computed yet) */
132 private volatile Long suid;
133
134 /** true if represents dynamic proxy class */
135 private boolean isProxy;
136 /** true if represents enum type */
137 private boolean isEnum;
138 /** true if represents record type */
139 private boolean isRecord;
140 /** true if represented class implements Serializable */
141 private boolean serializable;
142 /** true if represented class implements Externalizable */
143 private boolean externalizable;
144 /** true if desc has data written by class-defined writeObject method */
145 private boolean hasWriteObjectData;
146 /**
147 * true if desc has externalizable data written in block data format; this
148 * must be true by default to accommodate ObjectInputStream subclasses which
149 * override readClassDescriptor() to return class descriptors obtained from
150 * ObjectStreamClass.lookup() (see 4461737)
151 */
152 private boolean hasBlockExternalData = true;
153
154 /**
155 * Contains information about InvalidClassException instances to be thrown
156 * when attempting operations on an invalid class. Note that instances of
157 * this class are immutable and are potentially shared among
158 * ObjectStreamClass instances.
159 */
160 private static class ExceptionInfo {
161 private final String className;
162 private final String message;
163
164 ExceptionInfo(String cn, String msg) {
165 className = cn;
166 message = msg;
167 }
168
169 /**
170 * Returns (does not throw) an InvalidClassException instance created
171 * from the information in this object, suitable for being thrown by
172 * the caller.
173 */
174 InvalidClassException newInvalidClassException() {
175 return new InvalidClassException(className, message);
176 }
177 }
178
179 /** exception (if any) thrown while attempting to resolve class */
180 private ClassNotFoundException resolveEx;
181 /** exception (if any) to throw if non-enum deserialization attempted */
182 private ExceptionInfo deserializeEx;
183 /** exception (if any) to throw if non-enum serialization attempted */
184 private ExceptionInfo serializeEx;
185 /** exception (if any) to throw if default serialization attempted */
186 private ExceptionInfo defaultSerializeEx;
187
188 /** serializable fields */
189 private ObjectStreamField[] fields;
190 /** aggregate marshalled size of primitive fields */
191 private int primDataSize;
192 /** number of non-primitive fields */
193 private int numObjFields;
194 /** reflector for setting/getting serializable field values */
195 private FieldReflector fieldRefl;
196 /** data layout of serialized objects described by this class desc */
197 private volatile ClassDataSlot[] dataLayout;
198
199 /** serialization-appropriate constructor, or null if none */
200 private Constructor<?> cons;
201 /** record canonical constructor (shared among OSCs for same class), or null */
202 private MethodHandle canonicalCtr;
203 /** cache of record deserialization constructors per unique set of stream fields
204 * (shared among OSCs for same class), or null */
205 private DeserializationConstructorsCache deserializationCtrs;
206 /** session-cache of record deserialization constructor
207 * (in de-serialized OSC only), or null */
208 private MethodHandle deserializationCtr;
209 /** protection domains that need to be checked when calling the constructor */
210 private ProtectionDomain[] domains;
211
212 /** class-defined writeObject method, or null if none */
213 private Method writeObjectMethod;
214 /** class-defined readObject method, or null if none */
215 private Method readObjectMethod;
216 /** class-defined readObjectNoData method, or null if none */
217 private Method readObjectNoDataMethod;
218 /** class-defined writeReplace method, or null if none */
219 private Method writeReplaceMethod;
220 /** class-defined readResolve method, or null if none */
221 private Method readResolveMethod;
222
223 /** local class descriptor for represented class (may point to self) */
224 private ObjectStreamClass localDesc;
225 /** superclass descriptor appearing in stream */
226 private ObjectStreamClass superDesc;
227
228 /** true if, and only if, the object has been correctly initialized */
229 private boolean initialized;
230
231 /**
232 * Initializes native code.
233 */
234 private static native void initNative();
235 static {
236 initNative();
237 }
238
239 /**
240 * Find the descriptor for a class that can be serialized. Creates an
241 * ObjectStreamClass instance if one does not exist yet for class. Null is
242 * returned if the specified class does not implement java.io.Serializable
243 * or java.io.Externalizable.
244 *
245 * @param cl class for which to get the descriptor
246 * @return the class descriptor for the specified class
247 */
248 public static ObjectStreamClass lookup(Class<?> cl) {
249 return lookup(cl, false);
250 }
251
252 /**
253 * Returns the descriptor for any class, regardless of whether it
254 * implements {@link Serializable}.
255 *
256 * @param cl class for which to get the descriptor
257 * @return the class descriptor for the specified class
258 * @since 1.6
259 */
260 public static ObjectStreamClass lookupAny(Class<?> cl) {
261 return lookup(cl, true);
262 }
263
264 /**
265 * Returns the name of the class described by this descriptor.
266 * This method returns the name of the class in the format that
267 * is used by the {@link Class#getName} method.
268 *
269 * @return a string representing the name of the class
270 */
271 public String getName() {
272 return name;
273 }
274
275 /**
276 * Return the serialVersionUID for this class. The serialVersionUID
277 * defines a set of classes all with the same name that have evolved from a
278 * common root class and agree to be serialized and deserialized using a
279 * common format. NonSerializable classes have a serialVersionUID of 0L.
280 *
281 * @return the SUID of the class described by this descriptor
282 */
283 @SuppressWarnings("removal")
284 public long getSerialVersionUID() {
285 // REMIND: synchronize instead of relying on volatile?
286 if (suid == null) {
287 if (isRecord)
288 return 0L;
289
290 suid = AccessController.doPrivileged(
291 new PrivilegedAction<Long>() {
292 public Long run() {
293 return computeDefaultSUID(cl);
294 }
295 }
296 );
297 }
298 return suid.longValue();
299 }
300
301 /**
302 * Return the class in the local VM that this version is mapped to. Null
303 * is returned if there is no corresponding local class.
304 *
305 * @return the {@code Class} instance that this descriptor represents
306 */
307 @SuppressWarnings("removal")
308 @CallerSensitive
309 public Class<?> forClass() {
310 if (cl == null) {
311 return null;
312 }
313 requireInitialized();
314 if (System.getSecurityManager() != null) {
315 Class<?> caller = Reflection.getCallerClass();
316 if (ReflectUtil.needsPackageAccessCheck(caller.getClassLoader(), cl.getClassLoader())) {
317 ReflectUtil.checkPackageAccess(cl);
318 }
319 }
320 return cl;
321 }
322
323 /**
324 * Return an array of the fields of this serializable class.
325 *
326 * @return an array containing an element for each persistent field of
327 * this class. Returns an array of length zero if there are no
328 * fields.
329 * @since 1.2
330 */
331 public ObjectStreamField[] getFields() {
332 return getFields(true);
333 }
334
335 /**
336 * Get the field of this class by name.
337 *
338 * @param name the name of the data field to look for
339 * @return The ObjectStreamField object of the named field or null if
340 * there is no such named field.
341 */
342 public ObjectStreamField getField(String name) {
343 return getField(name, null);
344 }
345
346 /**
347 * Return a string describing this ObjectStreamClass.
348 */
349 public String toString() {
350 return name + ": static final long serialVersionUID = " +
351 getSerialVersionUID() + "L;";
352 }
353
354 /**
355 * Looks up and returns class descriptor for given class, or null if class
356 * is non-serializable and "all" is set to false.
357 *
358 * @param cl class to look up
359 * @param all if true, return descriptors for all classes; if false, only
360 * return descriptors for serializable classes
361 */
362 static ObjectStreamClass lookup(Class<?> cl, boolean all) {
363 if (!(all || Serializable.class.isAssignableFrom(cl))) {
364 return null;
365 }
366 processQueue(Caches.localDescsQueue, Caches.localDescs);
367 WeakClassKey key = new WeakClassKey(cl, Caches.localDescsQueue);
368 Reference<?> ref = Caches.localDescs.get(key);
369 Object entry = null;
370 if (ref != null) {
371 entry = ref.get();
372 }
373 EntryFuture future = null;
374 if (entry == null) {
375 EntryFuture newEntry = new EntryFuture();
376 Reference<?> newRef = new SoftReference<>(newEntry);
377 do {
378 if (ref != null) {
379 Caches.localDescs.remove(key, ref);
380 }
381 ref = Caches.localDescs.putIfAbsent(key, newRef);
382 if (ref != null) {
383 entry = ref.get();
384 }
385 } while (ref != null && entry == null);
386 if (entry == null) {
387 future = newEntry;
388 }
389 }
390
391 if (entry instanceof ObjectStreamClass) { // check common case first
392 return (ObjectStreamClass) entry;
393 }
394 if (entry instanceof EntryFuture) {
395 future = (EntryFuture) entry;
396 if (future.getOwner() == Thread.currentThread()) {
397 /*
398 * Handle nested call situation described by 4803747: waiting
399 * for future value to be set by a lookup() call further up the
400 * stack will result in deadlock, so calculate and set the
401 * future value here instead.
402 */
403 entry = null;
404 } else {
405 entry = future.get();
406 }
407 }
408 if (entry == null) {
409 try {
410 entry = new ObjectStreamClass(cl);
411 } catch (Throwable th) {
412 entry = th;
413 }
414 if (future.set(entry)) {
415 Caches.localDescs.put(key, new SoftReference<>(entry));
416 } else {
417 // nested lookup call already set future
418 entry = future.get();
419 }
420 }
421
422 if (entry instanceof ObjectStreamClass) {
423 return (ObjectStreamClass) entry;
424 } else if (entry instanceof RuntimeException) {
425 throw (RuntimeException) entry;
426 } else if (entry instanceof Error) {
427 throw (Error) entry;
428 } else {
429 throw new InternalError("unexpected entry: " + entry);
430 }
431 }
432
433 /**
434 * Placeholder used in class descriptor and field reflector lookup tables
435 * for an entry in the process of being initialized. (Internal) callers
436 * which receive an EntryFuture belonging to another thread as the result
437 * of a lookup should call the get() method of the EntryFuture; this will
438 * return the actual entry once it is ready for use and has been set(). To
439 * conserve objects, EntryFutures synchronize on themselves.
440 */
441 private static class EntryFuture {
442
443 private static final Object unset = new Object();
444 private final Thread owner = Thread.currentThread();
445 private Object entry = unset;
446
447 /**
448 * Attempts to set the value contained by this EntryFuture. If the
449 * EntryFuture's value has not been set already, then the value is
450 * saved, any callers blocked in the get() method are notified, and
451 * true is returned. If the value has already been set, then no saving
452 * or notification occurs, and false is returned.
453 */
454 synchronized boolean set(Object entry) {
455 if (this.entry != unset) {
456 return false;
457 }
458 this.entry = entry;
459 notifyAll();
460 return true;
461 }
462
463 /**
464 * Returns the value contained by this EntryFuture, blocking if
465 * necessary until a value is set.
466 */
467 @SuppressWarnings("removal")
468 synchronized Object get() {
469 boolean interrupted = false;
470 while (entry == unset) {
471 try {
472 wait();
473 } catch (InterruptedException ex) {
474 interrupted = true;
475 }
476 }
477 if (interrupted) {
478 AccessController.doPrivileged(
479 new PrivilegedAction<>() {
480 public Void run() {
481 Thread.currentThread().interrupt();
482 return null;
483 }
484 }
485 );
486 }
487 return entry;
488 }
489
490 /**
491 * Returns the thread that created this EntryFuture.
492 */
493 Thread getOwner() {
494 return owner;
495 }
496 }
497
498 /**
499 * Creates local class descriptor representing given class.
500 */
501 @SuppressWarnings("removal")
502 private ObjectStreamClass(final Class<?> cl) {
503 this.cl = cl;
504 name = cl.getName();
505 isProxy = Proxy.isProxyClass(cl);
506 isEnum = Enum.class.isAssignableFrom(cl);
507 boolean isPrimitiveClass = cl.isPrimitiveClass();
508 isRecord = cl.isRecord();
509 serializable = Serializable.class.isAssignableFrom(cl);
510 externalizable = Externalizable.class.isAssignableFrom(cl);
511
512 Class<?> superCl = cl.getSuperclass();
513 superDesc = (superCl != null) ? lookup(superCl, false) : null;
514 localDesc = this;
515
516 if (serializable) {
517 AccessController.doPrivileged(new PrivilegedAction<>() {
518 public Void run() {
519 if (isEnum) {
520 suid = 0L;
521 fields = NO_FIELDS;
522 return null;
523 }
524 if (cl.isArray()) {
525 fields = NO_FIELDS;
526 return null;
527 }
528
529 suid = getDeclaredSUID(cl);
530 try {
531 fields = getSerialFields(cl);
532 computeFieldOffsets();
533 } catch (InvalidClassException e) {
534 serializeEx = deserializeEx =
535 new ExceptionInfo(e.classname, e.getMessage());
536 fields = NO_FIELDS;
537 }
538
539 if (isRecord) {
540 canonicalCtr = canonicalRecordCtr(cl);
541 deserializationCtrs = new DeserializationConstructorsCache();
542 } else if (externalizable) {
543 cons = getExternalizableConstructor(cl);
544 } else {
545 cons = getSerializableConstructor(cl);
546 writeObjectMethod = getPrivateMethod(cl, "writeObject",
547 new Class<?>[] { ObjectOutputStream.class },
548 Void.TYPE);
549 readObjectMethod = getPrivateMethod(cl, "readObject",
550 new Class<?>[] { ObjectInputStream.class },
551 Void.TYPE);
552 readObjectNoDataMethod = getPrivateMethod(
553 cl, "readObjectNoData", null, Void.TYPE);
554 hasWriteObjectData = (writeObjectMethod != null);
555 }
556 domains = getProtectionDomains(cons, cl);
557 writeReplaceMethod = getInheritableMethod(
558 cl, "writeReplace", null, Object.class);
559 readResolveMethod = getInheritableMethod(
560 cl, "readResolve", null, Object.class);
561 return null;
562 }
563 });
564 } else {
565 suid = 0L;
566 fields = NO_FIELDS;
567 }
568
569 try {
570 fieldRefl = getReflector(fields, this);
571 } catch (InvalidClassException ex) {
572 // field mismatches impossible when matching local fields vs. self
573 throw new InternalError(ex);
574 }
575
576 if (deserializeEx == null) {
577 if (isEnum) {
578 deserializeEx = new ExceptionInfo(name, "enum type");
579 } else if (isPrimitiveClass && writeReplaceMethod == null) {
580 deserializeEx = new ExceptionInfo(name, "primitive class");
581 } else if (cons == null && !isRecord) {
582 deserializeEx = new ExceptionInfo(name, "no valid constructor");
583 }
584 }
585 if (isRecord && canonicalCtr == null) {
586 deserializeEx = new ExceptionInfo(name, "record canonical constructor not found");
587 } else {
588 for (int i = 0; i < fields.length; i++) {
589 if (fields[i].getField() == null) {
590 defaultSerializeEx = new ExceptionInfo(
591 name, "unmatched serializable field(s) declared");
592 }
593 }
594 }
595 initialized = true;
596 }
597
598 /**
599 * Creates blank class descriptor which should be initialized via a
600 * subsequent call to initProxy(), initNonProxy() or readNonProxy().
601 */
602 ObjectStreamClass() {
603 }
604
605 /**
606 * Creates a PermissionDomain that grants no permission.
607 */
608 private ProtectionDomain noPermissionsDomain() {
609 PermissionCollection perms = new Permissions();
610 perms.setReadOnly();
611 return new ProtectionDomain(null, perms);
612 }
613
614 /**
615 * Aggregate the ProtectionDomains of all the classes that separate
616 * a concrete class {@code cl} from its ancestor's class declaring
617 * a constructor {@code cons}.
618 *
619 * If {@code cl} is defined by the boot loader, or the constructor
620 * {@code cons} is declared by {@code cl}, or if there is no security
621 * manager, then this method does nothing and {@code null} is returned.
622 *
623 * @param cons A constructor declared by {@code cl} or one of its
624 * ancestors.
625 * @param cl A concrete class, which is either the class declaring
626 * the constructor {@code cons}, or a serializable subclass
627 * of that class.
628 * @return An array of ProtectionDomain representing the set of
629 * ProtectionDomain that separate the concrete class {@code cl}
630 * from its ancestor's declaring {@code cons}, or {@code null}.
631 */
632 @SuppressWarnings("removal")
633 private ProtectionDomain[] getProtectionDomains(Constructor<?> cons,
634 Class<?> cl) {
635 ProtectionDomain[] domains = null;
636 if (cons != null && cl.getClassLoader() != null
637 && System.getSecurityManager() != null) {
638 Class<?> cls = cl;
639 Class<?> fnscl = cons.getDeclaringClass();
640 Set<ProtectionDomain> pds = null;
641 while (cls != fnscl) {
642 ProtectionDomain pd = cls.getProtectionDomain();
643 if (pd != null) {
644 if (pds == null) pds = new HashSet<>();
645 pds.add(pd);
646 }
647 cls = cls.getSuperclass();
648 if (cls == null) {
649 // that's not supposed to happen
650 // make a ProtectionDomain with no permission.
651 // should we throw instead?
652 if (pds == null) pds = new HashSet<>();
653 else pds.clear();
654 pds.add(noPermissionsDomain());
655 break;
656 }
657 }
658 if (pds != null) {
659 domains = pds.toArray(new ProtectionDomain[0]);
660 }
661 }
662 return domains;
663 }
664
665 /**
666 * Initializes class descriptor representing a proxy class.
667 */
668 void initProxy(Class<?> cl,
669 ClassNotFoundException resolveEx,
670 ObjectStreamClass superDesc)
671 throws InvalidClassException
672 {
673 ObjectStreamClass osc = null;
674 if (cl != null) {
675 osc = lookup(cl, true);
676 if (!osc.isProxy) {
677 throw new InvalidClassException(
678 "cannot bind proxy descriptor to a non-proxy class");
679 }
680 }
681 this.cl = cl;
682 this.resolveEx = resolveEx;
683 this.superDesc = superDesc;
684 isProxy = true;
685 serializable = true;
686 suid = 0L;
687 fields = NO_FIELDS;
688 if (osc != null) {
689 localDesc = osc;
690 name = localDesc.name;
691 externalizable = localDesc.externalizable;
692 writeReplaceMethod = localDesc.writeReplaceMethod;
693 readResolveMethod = localDesc.readResolveMethod;
694 deserializeEx = localDesc.deserializeEx;
695 domains = localDesc.domains;
696 cons = localDesc.cons;
697 }
698 fieldRefl = getReflector(fields, localDesc);
699 initialized = true;
700 }
701
702 /**
703 * Initializes class descriptor representing a non-proxy class.
704 */
705 void initNonProxy(ObjectStreamClass model,
706 Class<?> cl,
707 ClassNotFoundException resolveEx,
708 ObjectStreamClass superDesc)
709 throws InvalidClassException
710 {
711 long suid = model.getSerialVersionUID();
712 ObjectStreamClass osc = null;
713 if (cl != null) {
714 osc = lookup(cl, true);
715 if (osc.isProxy) {
716 throw new InvalidClassException(
717 "cannot bind non-proxy descriptor to a proxy class");
718 }
719 if (model.isEnum != osc.isEnum) {
720 throw new InvalidClassException(model.isEnum ?
721 "cannot bind enum descriptor to a non-enum class" :
722 "cannot bind non-enum descriptor to an enum class");
723 }
724
725 if (model.serializable == osc.serializable &&
726 !cl.isArray() && !cl.isRecord() &&
727 suid != osc.getSerialVersionUID()) {
728 throw new InvalidClassException(osc.name,
729 "local class incompatible: " +
730 "stream classdesc serialVersionUID = " + suid +
731 ", local class serialVersionUID = " +
732 osc.getSerialVersionUID());
733 }
734
735 if (!classNamesEqual(model.name, osc.name)) {
736 throw new InvalidClassException(osc.name,
737 "local class name incompatible with stream class " +
738 "name \"" + model.name + "\"");
739 }
740
741 if (!model.isEnum) {
742 if ((model.serializable == osc.serializable) &&
743 (model.externalizable != osc.externalizable)) {
744 throw new InvalidClassException(osc.name,
745 "Serializable incompatible with Externalizable");
746 }
747
748 if ((model.serializable != osc.serializable) ||
749 (model.externalizable != osc.externalizable) ||
750 !(model.serializable || model.externalizable)) {
751 deserializeEx = new ExceptionInfo(
752 osc.name, "class invalid for deserialization");
753 }
754 }
755 }
756
757 this.cl = cl;
758 this.resolveEx = resolveEx;
759 this.superDesc = superDesc;
760 name = model.name;
761 this.suid = suid;
762 isProxy = false;
763 isEnum = model.isEnum;
764 serializable = model.serializable;
765 externalizable = model.externalizable;
766 hasBlockExternalData = model.hasBlockExternalData;
767 hasWriteObjectData = model.hasWriteObjectData;
768 fields = model.fields;
769 primDataSize = model.primDataSize;
770 numObjFields = model.numObjFields;
771
772 if (osc != null) {
773 localDesc = osc;
774 isRecord = localDesc.isRecord;
775 // canonical record constructor is shared
776 canonicalCtr = localDesc.canonicalCtr;
777 // cache of deserialization constructors is shared
778 deserializationCtrs = localDesc.deserializationCtrs;
779 writeObjectMethod = localDesc.writeObjectMethod;
780 readObjectMethod = localDesc.readObjectMethod;
781 readObjectNoDataMethod = localDesc.readObjectNoDataMethod;
782 writeReplaceMethod = localDesc.writeReplaceMethod;
783 readResolveMethod = localDesc.readResolveMethod;
784 if (deserializeEx == null) {
785 deserializeEx = localDesc.deserializeEx;
786 }
787 domains = localDesc.domains;
788 assert cl.isRecord() ? localDesc.cons == null : true;
789 cons = localDesc.cons;
790 }
791
792 fieldRefl = getReflector(fields, localDesc);
793 // reassign to matched fields so as to reflect local unshared settings
794 fields = fieldRefl.getFields();
795
796 initialized = true;
797 }
798
799 /**
800 * Reads non-proxy class descriptor information from given input stream.
801 * The resulting class descriptor is not fully functional; it can only be
802 * used as input to the ObjectInputStream.resolveClass() and
803 * ObjectStreamClass.initNonProxy() methods.
804 */
805 void readNonProxy(ObjectInputStream in)
806 throws IOException, ClassNotFoundException
807 {
808 name = in.readUTF();
809 suid = in.readLong();
810 isProxy = false;
811
812 byte flags = in.readByte();
813 hasWriteObjectData =
814 ((flags & ObjectStreamConstants.SC_WRITE_METHOD) != 0);
815 hasBlockExternalData =
816 ((flags & ObjectStreamConstants.SC_BLOCK_DATA) != 0);
817 externalizable =
818 ((flags & ObjectStreamConstants.SC_EXTERNALIZABLE) != 0);
819 boolean sflag =
820 ((flags & ObjectStreamConstants.SC_SERIALIZABLE) != 0);
821 if (externalizable && sflag) {
822 throw new InvalidClassException(
823 name, "serializable and externalizable flags conflict");
824 }
825 serializable = externalizable || sflag;
826 isEnum = ((flags & ObjectStreamConstants.SC_ENUM) != 0);
827 if (isEnum && suid.longValue() != 0L) {
828 throw new InvalidClassException(name,
829 "enum descriptor has non-zero serialVersionUID: " + suid);
830 }
831
832 int numFields = in.readShort();
833 if (isEnum && numFields != 0) {
834 throw new InvalidClassException(name,
835 "enum descriptor has non-zero field count: " + numFields);
836 }
837 fields = (numFields > 0) ?
838 new ObjectStreamField[numFields] : NO_FIELDS;
839 for (int i = 0; i < numFields; i++) {
840 char tcode = (char) in.readByte();
841 String fname = in.readUTF();
842 String signature = ((tcode == 'L') || (tcode == '[')) ?
843 in.readTypeString() : String.valueOf(tcode);
844 try {
845 fields[i] = new ObjectStreamField(fname, signature, false);
846 } catch (RuntimeException e) {
847 throw (IOException) new InvalidClassException(name,
848 "invalid descriptor for field " + fname).initCause(e);
849 }
850 }
851 computeFieldOffsets();
852 }
853
854 /**
855 * Writes non-proxy class descriptor information to given output stream.
856 */
857 void writeNonProxy(ObjectOutputStream out) throws IOException {
858 out.writeUTF(name);
859 out.writeLong(getSerialVersionUID());
860
861 byte flags = 0;
862 if (externalizable) {
863 flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
864 int protocol = out.getProtocolVersion();
865 if (protocol != ObjectStreamConstants.PROTOCOL_VERSION_1) {
866 flags |= ObjectStreamConstants.SC_BLOCK_DATA;
867 }
868 } else if (serializable) {
869 flags |= ObjectStreamConstants.SC_SERIALIZABLE;
870 }
871 if (hasWriteObjectData) {
872 flags |= ObjectStreamConstants.SC_WRITE_METHOD;
873 }
874 if (isEnum) {
875 flags |= ObjectStreamConstants.SC_ENUM;
876 }
877 out.writeByte(flags);
878
879 out.writeShort(fields.length);
880 for (int i = 0; i < fields.length; i++) {
881 ObjectStreamField f = fields[i];
882 out.writeByte(f.getTypeCode());
883 out.writeUTF(f.getName());
884 if (!f.isPrimitive()) {
885 out.writeTypeString(f.getTypeString());
886 }
887 }
888 }
889
890 /**
891 * Returns ClassNotFoundException (if any) thrown while attempting to
892 * resolve local class corresponding to this class descriptor.
893 */
894 ClassNotFoundException getResolveException() {
895 return resolveEx;
896 }
897
898 /**
899 * Throws InternalError if not initialized.
900 */
901 private final void requireInitialized() {
902 if (!initialized)
903 throw new InternalError("Unexpected call when not initialized");
904 }
905
906 /**
907 * Throws InvalidClassException if not initialized.
908 * To be called in cases where an uninitialized class descriptor indicates
909 * a problem in the serialization stream.
910 */
911 final void checkInitialized() throws InvalidClassException {
912 if (!initialized) {
913 throw new InvalidClassException("Class descriptor should be initialized");
914 }
915 }
916
917 /**
918 * Throws an InvalidClassException if object instances referencing this
919 * class descriptor should not be allowed to deserialize. This method does
920 * not apply to deserialization of enum constants.
921 */
922 void checkDeserialize() throws InvalidClassException {
923 requireInitialized();
924 if (deserializeEx != null) {
925 throw deserializeEx.newInvalidClassException();
926 }
927 }
928
929 /**
930 * Throws an InvalidClassException if objects whose class is represented by
931 * this descriptor should not be allowed to serialize. This method does
932 * not apply to serialization of enum constants.
933 */
934 void checkSerialize() throws InvalidClassException {
935 requireInitialized();
936 if (serializeEx != null) {
937 throw serializeEx.newInvalidClassException();
938 }
939 }
940
941 /**
942 * Throws an InvalidClassException if objects whose class is represented by
943 * this descriptor should not be permitted to use default serialization
944 * (e.g., if the class declares serializable fields that do not correspond
945 * to actual fields, and hence must use the GetField API). This method
946 * does not apply to deserialization of enum constants.
947 */
948 void checkDefaultSerialize() throws InvalidClassException {
949 requireInitialized();
950 if (defaultSerializeEx != null) {
951 throw defaultSerializeEx.newInvalidClassException();
952 }
953 }
954
955 /**
956 * Returns superclass descriptor. Note that on the receiving side, the
957 * superclass descriptor may be bound to a class that is not a superclass
958 * of the subclass descriptor's bound class.
959 */
960 ObjectStreamClass getSuperDesc() {
961 requireInitialized();
962 return superDesc;
963 }
964
965 /**
966 * Returns the "local" class descriptor for the class associated with this
967 * class descriptor (i.e., the result of
968 * ObjectStreamClass.lookup(this.forClass())) or null if there is no class
969 * associated with this descriptor.
970 */
971 ObjectStreamClass getLocalDesc() {
972 requireInitialized();
973 return localDesc;
974 }
975
976 /**
977 * Returns arrays of ObjectStreamFields representing the serializable
978 * fields of the represented class. If copy is true, a clone of this class
979 * descriptor's field array is returned, otherwise the array itself is
980 * returned.
981 */
982 ObjectStreamField[] getFields(boolean copy) {
983 return copy ? fields.clone() : fields;
984 }
985
986 /**
987 * Looks up a serializable field of the represented class by name and type.
988 * A specified type of null matches all types, Object.class matches all
989 * non-primitive types, and any other non-null type matches assignable
990 * types only. Returns matching field, or null if no match found.
991 */
992 ObjectStreamField getField(String name, Class<?> type) {
993 for (int i = 0; i < fields.length; i++) {
994 ObjectStreamField f = fields[i];
995 if (f.getName().equals(name)) {
996 if (type == null ||
997 (type == Object.class && !f.isPrimitive()))
998 {
999 return f;
1000 }
1001 Class<?> ftype = f.getType();
1002 if (ftype != null && type.isAssignableFrom(ftype)) {
1003 return f;
1004 }
1005 }
1006 }
1007 return null;
1008 }
1009
1010 /**
1011 * Returns true if class descriptor represents a dynamic proxy class, false
1012 * otherwise.
1013 */
1014 boolean isProxy() {
1015 requireInitialized();
1016 return isProxy;
1017 }
1018
1019 /**
1020 * Returns true if class descriptor represents an enum type, false
1021 * otherwise.
1022 */
1023 boolean isEnum() {
1024 requireInitialized();
1025 return isEnum;
1026 }
1027
1028 /**
1029 * Returns true if class descriptor represents a record type, false
1030 * otherwise.
1031 */
1032 boolean isRecord() {
1033 requireInitialized();
1034 return isRecord;
1035 }
1036
1037 /**
1038 * Returns true if represented class implements Externalizable, false
1039 * otherwise.
1040 */
1041 boolean isExternalizable() {
1042 requireInitialized();
1043 return externalizable;
1044 }
1045
1046 /**
1047 * Returns true if represented class implements Serializable, false
1048 * otherwise.
1049 */
1050 boolean isSerializable() {
1051 requireInitialized();
1052 return serializable;
1053 }
1054
1055 /**
1056 * Returns true if class descriptor represents externalizable class that
1057 * has written its data in 1.2 (block data) format, false otherwise.
1058 */
1059 boolean hasBlockExternalData() {
1060 requireInitialized();
1061 return hasBlockExternalData;
1062 }
1063
1064 /**
1065 * Returns true if class descriptor represents serializable (but not
1066 * externalizable) class which has written its data via a custom
1067 * writeObject() method, false otherwise.
1068 */
1069 boolean hasWriteObjectData() {
1070 requireInitialized();
1071 return hasWriteObjectData;
1072 }
1073
1074 /**
1075 * Returns true if represented class is serializable/externalizable and can
1076 * be instantiated by the serialization runtime--i.e., if it is
1077 * externalizable and defines a public no-arg constructor, or if it is
1078 * non-externalizable and its first non-serializable superclass defines an
1079 * accessible no-arg constructor. Otherwise, returns false.
1080 */
1081 boolean isInstantiable() {
1082 requireInitialized();
1083 return (cons != null);
1084 }
1085
1086 /**
1087 * Returns true if represented class is serializable (but not
1088 * externalizable) and defines a conformant writeObject method. Otherwise,
1089 * returns false.
1090 */
1091 boolean hasWriteObjectMethod() {
1092 requireInitialized();
1093 return (writeObjectMethod != null);
1094 }
1095
1096 /**
1097 * Returns true if represented class is serializable (but not
1098 * externalizable) and defines a conformant readObject method. Otherwise,
1099 * returns false.
1100 */
1101 boolean hasReadObjectMethod() {
1102 requireInitialized();
1103 return (readObjectMethod != null);
1104 }
1105
1106 /**
1107 * Returns true if represented class is serializable (but not
1108 * externalizable) and defines a conformant readObjectNoData method.
1109 * Otherwise, returns false.
1110 */
1111 boolean hasReadObjectNoDataMethod() {
1112 requireInitialized();
1113 return (readObjectNoDataMethod != null);
1114 }
1115
1116 /**
1117 * Returns true if represented class is serializable or externalizable and
1118 * defines a conformant writeReplace method. Otherwise, returns false.
1119 */
1120 boolean hasWriteReplaceMethod() {
1121 requireInitialized();
1122 return (writeReplaceMethod != null);
1123 }
1124
1125 /**
1126 * Returns true if represented class is serializable or externalizable and
1127 * defines a conformant readResolve method. Otherwise, returns false.
1128 */
1129 boolean hasReadResolveMethod() {
1130 requireInitialized();
1131 return (readResolveMethod != null);
1132 }
1133
1134 /**
1135 * Creates a new instance of the represented class. If the class is
1136 * externalizable, invokes its public no-arg constructor; otherwise, if the
1137 * class is serializable, invokes the no-arg constructor of the first
1138 * non-serializable superclass. Throws UnsupportedOperationException if
1139 * this class descriptor is not associated with a class, if the associated
1140 * class is non-serializable or if the appropriate no-arg constructor is
1141 * inaccessible/unavailable.
1142 */
1143 @SuppressWarnings("removal")
1144 Object newInstance()
1145 throws InstantiationException, InvocationTargetException,
1146 UnsupportedOperationException
1147 {
1148 requireInitialized();
1149 if (cons != null) {
1150 try {
1151 if (domains == null || domains.length == 0) {
1152 return cons.newInstance();
1153 } else {
1154 JavaSecurityAccess jsa = SharedSecrets.getJavaSecurityAccess();
1155 PrivilegedAction<?> pea = () -> {
1156 try {
1157 return cons.newInstance();
1158 } catch (InstantiationException
1159 | InvocationTargetException
1160 | IllegalAccessException x) {
1161 throw new UndeclaredThrowableException(x);
1162 }
1163 }; // Can't use PrivilegedExceptionAction with jsa
1164 try {
1165 return jsa.doIntersectionPrivilege(pea,
1166 AccessController.getContext(),
1167 new AccessControlContext(domains));
1168 } catch (UndeclaredThrowableException x) {
1169 Throwable cause = x.getCause();
1170 if (cause instanceof InstantiationException)
1171 throw (InstantiationException) cause;
1172 if (cause instanceof InvocationTargetException)
1173 throw (InvocationTargetException) cause;
1174 if (cause instanceof IllegalAccessException)
1175 throw (IllegalAccessException) cause;
1176 // not supposed to happen
1177 throw x;
1178 }
1179 }
1180 } catch (IllegalAccessException ex) {
1181 // should not occur, as access checks have been suppressed
1182 throw new InternalError(ex);
1183 } catch (InstantiationError err) {
1184 var ex = new InstantiationException();
1185 ex.initCause(err);
1186 throw ex;
1187 }
1188 } else {
1189 throw new UnsupportedOperationException();
1190 }
1191 }
1192
1193 /**
1194 * Invokes the writeObject method of the represented serializable class.
1195 * Throws UnsupportedOperationException if this class descriptor is not
1196 * associated with a class, or if the class is externalizable,
1197 * non-serializable or does not define writeObject.
1198 */
1199 void invokeWriteObject(Object obj, ObjectOutputStream out)
1200 throws IOException, UnsupportedOperationException
1201 {
1202 requireInitialized();
1203 if (writeObjectMethod != null) {
1204 try {
1205 writeObjectMethod.invoke(obj, new Object[]{ out });
1206 } catch (InvocationTargetException ex) {
1207 Throwable th = ex.getCause();
1208 if (th instanceof IOException) {
1209 throw (IOException) th;
1210 } else {
1211 throwMiscException(th);
1212 }
1213 } catch (IllegalAccessException ex) {
1214 // should not occur, as access checks have been suppressed
1215 throw new InternalError(ex);
1216 }
1217 } else {
1218 throw new UnsupportedOperationException();
1219 }
1220 }
1221
1222 /**
1223 * Invokes the readObject method of the represented serializable class.
1224 * Throws UnsupportedOperationException if this class descriptor is not
1225 * associated with a class, or if the class is externalizable,
1226 * non-serializable or does not define readObject.
1227 */
1228 void invokeReadObject(Object obj, ObjectInputStream in)
1229 throws ClassNotFoundException, IOException,
1230 UnsupportedOperationException
1231 {
1232 requireInitialized();
1233 if (readObjectMethod != null) {
1234 try {
1235 readObjectMethod.invoke(obj, new Object[]{ in });
1236 } catch (InvocationTargetException ex) {
1237 Throwable th = ex.getCause();
1238 if (th instanceof ClassNotFoundException) {
1239 throw (ClassNotFoundException) th;
1240 } else if (th instanceof IOException) {
1241 throw (IOException) th;
1242 } else {
1243 throwMiscException(th);
1244 }
1245 } catch (IllegalAccessException ex) {
1246 // should not occur, as access checks have been suppressed
1247 throw new InternalError(ex);
1248 }
1249 } else {
1250 throw new UnsupportedOperationException();
1251 }
1252 }
1253
1254 /**
1255 * Invokes the readObjectNoData method of the represented serializable
1256 * class. Throws UnsupportedOperationException if this class descriptor is
1257 * not associated with a class, or if the class is externalizable,
1258 * non-serializable or does not define readObjectNoData.
1259 */
1260 void invokeReadObjectNoData(Object obj)
1261 throws IOException, UnsupportedOperationException
1262 {
1263 requireInitialized();
1264 if (readObjectNoDataMethod != null) {
1265 try {
1266 readObjectNoDataMethod.invoke(obj, (Object[]) null);
1267 } catch (InvocationTargetException ex) {
1268 Throwable th = ex.getCause();
1269 if (th instanceof ObjectStreamException) {
1270 throw (ObjectStreamException) th;
1271 } else {
1272 throwMiscException(th);
1273 }
1274 } catch (IllegalAccessException ex) {
1275 // should not occur, as access checks have been suppressed
1276 throw new InternalError(ex);
1277 }
1278 } else {
1279 throw new UnsupportedOperationException();
1280 }
1281 }
1282
1283 /**
1284 * Invokes the writeReplace method of the represented serializable class and
1285 * returns the result. Throws UnsupportedOperationException if this class
1286 * descriptor is not associated with a class, or if the class is
1287 * non-serializable or does not define writeReplace.
1288 */
1289 Object invokeWriteReplace(Object obj)
1290 throws IOException, UnsupportedOperationException
1291 {
1292 requireInitialized();
1293 if (writeReplaceMethod != null) {
1294 try {
1295 return writeReplaceMethod.invoke(obj, (Object[]) null);
1296 } catch (InvocationTargetException ex) {
1297 Throwable th = ex.getCause();
1298 if (th instanceof ObjectStreamException) {
1299 throw (ObjectStreamException) th;
1300 } else {
1301 throwMiscException(th);
1302 throw new InternalError(th); // never reached
1303 }
1304 } catch (IllegalAccessException ex) {
1305 // should not occur, as access checks have been suppressed
1306 throw new InternalError(ex);
1307 }
1308 } else {
1309 throw new UnsupportedOperationException();
1310 }
1311 }
1312
1313 /**
1314 * Invokes the readResolve method of the represented serializable class and
1315 * returns the result. Throws UnsupportedOperationException if this class
1316 * descriptor is not associated with a class, or if the class is
1317 * non-serializable or does not define readResolve.
1318 */
1319 Object invokeReadResolve(Object obj)
1320 throws IOException, UnsupportedOperationException
1321 {
1322 requireInitialized();
1323 if (readResolveMethod != null) {
1324 try {
1325 return readResolveMethod.invoke(obj, (Object[]) null);
1326 } catch (InvocationTargetException ex) {
1327 Throwable th = ex.getCause();
1328 if (th instanceof ObjectStreamException) {
1329 throw (ObjectStreamException) th;
1330 } else {
1331 throwMiscException(th);
1332 throw new InternalError(th); // never reached
1333 }
1334 } catch (IllegalAccessException ex) {
1335 // should not occur, as access checks have been suppressed
1336 throw new InternalError(ex);
1337 }
1338 } else {
1339 throw new UnsupportedOperationException();
1340 }
1341 }
1342
1343 /**
1344 * Class representing the portion of an object's serialized form allotted
1345 * to data described by a given class descriptor. If "hasData" is false,
1346 * the object's serialized form does not contain data associated with the
1347 * class descriptor.
1348 */
1349 static class ClassDataSlot {
1350
1351 /** class descriptor "occupying" this slot */
1352 final ObjectStreamClass desc;
1353 /** true if serialized form includes data for this slot's descriptor */
1354 final boolean hasData;
1355
1356 ClassDataSlot(ObjectStreamClass desc, boolean hasData) {
1357 this.desc = desc;
1358 this.hasData = hasData;
1359 }
1360 }
1361
1362 /**
1363 * Returns array of ClassDataSlot instances representing the data layout
1364 * (including superclass data) for serialized objects described by this
1365 * class descriptor. ClassDataSlots are ordered by inheritance with those
1366 * containing "higher" superclasses appearing first. The final
1367 * ClassDataSlot contains a reference to this descriptor.
1368 */
1369 ClassDataSlot[] getClassDataLayout() throws InvalidClassException {
1370 // REMIND: synchronize instead of relying on volatile?
1371 if (dataLayout == null) {
1372 dataLayout = getClassDataLayout0();
1373 }
1374 return dataLayout;
1375 }
1376
1377 private ClassDataSlot[] getClassDataLayout0()
1378 throws InvalidClassException
1379 {
1380 ArrayList<ClassDataSlot> slots = new ArrayList<>();
1381 Class<?> start = cl, end = cl;
1382
1383 // locate closest non-serializable superclass
1384 while (end != null && Serializable.class.isAssignableFrom(end)) {
1385 end = end.getSuperclass();
1386 }
1387
1388 HashSet<String> oscNames = new HashSet<>(3);
1389
1390 for (ObjectStreamClass d = this; d != null; d = d.superDesc) {
1391 if (oscNames.contains(d.name)) {
1392 throw new InvalidClassException("Circular reference.");
1393 } else {
1394 oscNames.add(d.name);
1395 }
1396
1397 // search up inheritance hierarchy for class with matching name
1398 String searchName = (d.cl != null) ? d.cl.getName() : d.name;
1399 Class<?> match = null;
1400 for (Class<?> c = start; c != end; c = c.getSuperclass()) {
1401 if (searchName.equals(c.getName())) {
1402 match = c;
1403 break;
1404 }
1405 }
1406
1407 // add "no data" slot for each unmatched class below match
1408 if (match != null) {
1409 for (Class<?> c = start; c != match; c = c.getSuperclass()) {
1410 slots.add(new ClassDataSlot(
1411 ObjectStreamClass.lookup(c, true), false));
1412 }
1413 start = match.getSuperclass();
1414 }
1415
1416 // record descriptor/class pairing
1417 slots.add(new ClassDataSlot(d.getVariantFor(match), true));
1418 }
1419
1420 // add "no data" slot for any leftover unmatched classes
1421 for (Class<?> c = start; c != end; c = c.getSuperclass()) {
1422 slots.add(new ClassDataSlot(
1423 ObjectStreamClass.lookup(c, true), false));
1424 }
1425
1426 // order slots from superclass -> subclass
1427 Collections.reverse(slots);
1428 return slots.toArray(new ClassDataSlot[slots.size()]);
1429 }
1430
1431 /**
1432 * Returns aggregate size (in bytes) of marshalled primitive field values
1433 * for represented class.
1434 */
1435 int getPrimDataSize() {
1436 return primDataSize;
1437 }
1438
1439 /**
1440 * Returns number of non-primitive serializable fields of represented
1441 * class.
1442 */
1443 int getNumObjFields() {
1444 return numObjFields;
1445 }
1446
1447 /**
1448 * Fetches the serializable primitive field values of object obj and
1449 * marshals them into byte array buf starting at offset 0. It is the
1450 * responsibility of the caller to ensure that obj is of the proper type if
1451 * non-null.
1452 */
1453 void getPrimFieldValues(Object obj, byte[] buf) {
1454 fieldRefl.getPrimFieldValues(obj, buf);
1455 }
1456
1457 /**
1458 * Sets the serializable primitive fields of object obj using values
1459 * unmarshalled from byte array buf starting at offset 0. It is the
1460 * responsibility of the caller to ensure that obj is of the proper type if
1461 * non-null.
1462 */
1463 void setPrimFieldValues(Object obj, byte[] buf) {
1464 fieldRefl.setPrimFieldValues(obj, buf);
1465 }
1466
1467 /**
1468 * Fetches the serializable object field values of object obj and stores
1469 * them in array vals starting at offset 0. It is the responsibility of
1470 * the caller to ensure that obj is of the proper type if non-null.
1471 */
1472 void getObjFieldValues(Object obj, Object[] vals) {
1473 fieldRefl.getObjFieldValues(obj, vals);
1474 }
1475
1476 /**
1477 * Checks that the given values, from array vals starting at offset 0,
1478 * are assignable to the given serializable object fields.
1479 * @throws ClassCastException if any value is not assignable
1480 */
1481 void checkObjFieldValueTypes(Object obj, Object[] vals) {
1482 fieldRefl.checkObjectFieldValueTypes(obj, vals);
1483 }
1484
1485 /**
1486 * Sets the serializable object fields of object obj using values from
1487 * array vals starting at offset 0. It is the responsibility of the caller
1488 * to ensure that obj is of the proper type if non-null.
1489 */
1490 void setObjFieldValues(Object obj, Object[] vals) {
1491 fieldRefl.setObjFieldValues(obj, vals);
1492 }
1493
1494 /**
1495 * Calculates and sets serializable field offsets, as well as primitive
1496 * data size and object field count totals. Throws InvalidClassException
1497 * if fields are illegally ordered.
1498 */
1499 private void computeFieldOffsets() throws InvalidClassException {
1500 primDataSize = 0;
1501 numObjFields = 0;
1502 int firstObjIndex = -1;
1503
1504 for (int i = 0; i < fields.length; i++) {
1505 ObjectStreamField f = fields[i];
1506 switch (f.getTypeCode()) {
1507 case 'Z', 'B' -> f.setOffset(primDataSize++);
1508 case 'C', 'S' -> {
1509 f.setOffset(primDataSize);
1510 primDataSize += 2;
1511 }
1512 case 'I', 'F' -> {
1513 f.setOffset(primDataSize);
1514 primDataSize += 4;
1515 }
1516 case 'J', 'D' -> {
1517 f.setOffset(primDataSize);
1518 primDataSize += 8;
1519 }
1520 case '[', 'L' -> {
1521 f.setOffset(numObjFields++);
1522 if (firstObjIndex == -1) {
1523 firstObjIndex = i;
1524 }
1525 }
1526 default -> throw new InternalError();
1527 }
1528 }
1529 if (firstObjIndex != -1 &&
1530 firstObjIndex + numObjFields != fields.length)
1531 {
1532 throw new InvalidClassException(name, "illegal field order");
1533 }
1534 }
1535
1536 /**
1537 * If given class is the same as the class associated with this class
1538 * descriptor, returns reference to this class descriptor. Otherwise,
1539 * returns variant of this class descriptor bound to given class.
1540 */
1541 private ObjectStreamClass getVariantFor(Class<?> cl)
1542 throws InvalidClassException
1543 {
1544 if (this.cl == cl) {
1545 return this;
1546 }
1547 ObjectStreamClass desc = new ObjectStreamClass();
1548 if (isProxy) {
1549 desc.initProxy(cl, null, superDesc);
1550 } else {
1551 desc.initNonProxy(this, cl, null, superDesc);
1552 }
1553 return desc;
1554 }
1555
1556 /**
1557 * Returns public no-arg constructor of given class, or null if none found.
1558 * Access checks are disabled on the returned constructor (if any), since
1559 * the defining class may still be non-public.
1560 */
1561 private static Constructor<?> getExternalizableConstructor(Class<?> cl) {
1562 try {
1563 Constructor<?> cons = cl.getDeclaredConstructor((Class<?>[]) null);
1564 cons.setAccessible(true);
1565 return ((cons.getModifiers() & Modifier.PUBLIC) != 0) ?
1566 cons : null;
1567 } catch (NoSuchMethodException | InaccessibleObjectException ex) {
1568 return null;
1569 }
1570 }
1571
1572 /**
1573 * Returns subclass-accessible no-arg constructor of first non-serializable
1574 * superclass, or null if none found. Access checks are disabled on the
1575 * returned constructor (if any).
1576 */
1577 private static Constructor<?> getSerializableConstructor(Class<?> cl) {
1578 return reflFactory.newConstructorForSerialization(cl);
1579 }
1580
1581 /**
1582 * Returns the canonical constructor for the given record class, or null if
1583 * the not found ( which should never happen for correctly generated record
1584 * classes ).
1585 */
1586 @SuppressWarnings("removal")
1587 private static MethodHandle canonicalRecordCtr(Class<?> cls) {
1588 assert cls.isRecord() : "Expected record, got: " + cls;
1589 PrivilegedAction<MethodHandle> pa = () -> {
1590 Class<?>[] paramTypes = Arrays.stream(cls.getRecordComponents())
1591 .map(RecordComponent::getType)
1592 .toArray(Class<?>[]::new);
1593 try {
1594 Constructor<?> ctr = cls.getDeclaredConstructor(paramTypes);
1595 ctr.setAccessible(true);
1596 return MethodHandles.lookup().unreflectConstructor(ctr);
1597 } catch (IllegalAccessException | NoSuchMethodException e) {
1598 return null;
1599 }
1600 };
1601 return AccessController.doPrivileged(pa);
1602 }
1603
1604 /**
1605 * Returns the canonical constructor, if the local class equivalent of this
1606 * stream class descriptor is a record class, otherwise null.
1607 */
1608 MethodHandle getRecordConstructor() {
1609 return canonicalCtr;
1610 }
1611
1612 /**
1613 * Returns non-static, non-abstract method with given signature provided it
1614 * is defined by or accessible (via inheritance) by the given class, or
1615 * null if no match found. Access checks are disabled on the returned
1616 * method (if any).
1617 */
1618 private static Method getInheritableMethod(Class<?> cl, String name,
1619 Class<?>[] argTypes,
1620 Class<?> returnType)
1621 {
1622 Method meth = null;
1623 Class<?> defCl = cl;
1624 while (defCl != null) {
1625 try {
1626 meth = defCl.getDeclaredMethod(name, argTypes);
1627 break;
1628 } catch (NoSuchMethodException ex) {
1629 defCl = defCl.getSuperclass();
1630 }
1631 }
1632
1633 if ((meth == null) || (meth.getReturnType() != returnType)) {
1634 return null;
1635 }
1636 meth.setAccessible(true);
1637 int mods = meth.getModifiers();
1638 if ((mods & (Modifier.STATIC | Modifier.ABSTRACT)) != 0) {
1639 return null;
1640 } else if ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) != 0) {
1641 return meth;
1642 } else if ((mods & Modifier.PRIVATE) != 0) {
1643 return (cl == defCl) ? meth : null;
1644 } else {
1645 return packageEquals(cl, defCl) ? meth : null;
1646 }
1647 }
1648
1649 /**
1650 * Returns non-static private method with given signature defined by given
1651 * class, or null if none found. Access checks are disabled on the
1652 * returned method (if any).
1653 */
1654 private static Method getPrivateMethod(Class<?> cl, String name,
1655 Class<?>[] argTypes,
1656 Class<?> returnType)
1657 {
1658 try {
1659 Method meth = cl.getDeclaredMethod(name, argTypes);
1660 meth.setAccessible(true);
1661 int mods = meth.getModifiers();
1662 return ((meth.getReturnType() == returnType) &&
1663 ((mods & Modifier.STATIC) == 0) &&
1664 ((mods & Modifier.PRIVATE) != 0)) ? meth : null;
1665 } catch (NoSuchMethodException ex) {
1666 return null;
1667 }
1668 }
1669
1670 /**
1671 * Returns true if classes are defined in the same runtime package, false
1672 * otherwise.
1673 */
1674 private static boolean packageEquals(Class<?> cl1, Class<?> cl2) {
1675 return cl1.getClassLoader() == cl2.getClassLoader() &&
1676 cl1.getPackageName() == cl2.getPackageName();
1677 }
1678
1679 /**
1680 * Compares class names for equality, ignoring package names. Returns true
1681 * if class names equal, false otherwise.
1682 */
1683 private static boolean classNamesEqual(String name1, String name2) {
1684 int idx1 = name1.lastIndexOf('.') + 1;
1685 int idx2 = name2.lastIndexOf('.') + 1;
1686 int len1 = name1.length() - idx1;
1687 int len2 = name2.length() - idx2;
1688 return len1 == len2 &&
1689 name1.regionMatches(idx1, name2, idx2, len1);
1690 }
1691
1692 /**
1693 * Returns JVM type signature for given list of parameters and return type.
1694 */
1695 private static String getMethodSignature(Class<?>[] paramTypes,
1696 Class<?> retType)
1697 {
1698 StringBuilder sb = new StringBuilder();
1699 sb.append('(');
1700 for (int i = 0; i < paramTypes.length; i++) {
1701 appendClassSignature(sb, paramTypes[i]);
1702 }
1703 sb.append(')');
1704 appendClassSignature(sb, retType);
1705 return sb.toString();
1706 }
1707
1708 /**
1709 * Convenience method for throwing an exception that is either a
1710 * RuntimeException, Error, or of some unexpected type (in which case it is
1711 * wrapped inside an IOException).
1712 */
1713 private static void throwMiscException(Throwable th) throws IOException {
1714 if (th instanceof RuntimeException) {
1715 throw (RuntimeException) th;
1716 } else if (th instanceof Error) {
1717 throw (Error) th;
1718 } else {
1719 throw new IOException("unexpected exception type", th);
1720 }
1721 }
1722
1723 /**
1724 * Returns ObjectStreamField array describing the serializable fields of
1725 * the given class. Serializable fields backed by an actual field of the
1726 * class are represented by ObjectStreamFields with corresponding non-null
1727 * Field objects. Throws InvalidClassException if the (explicitly
1728 * declared) serializable fields are invalid.
1729 */
1730 private static ObjectStreamField[] getSerialFields(Class<?> cl)
1731 throws InvalidClassException
1732 {
1733 if (!Serializable.class.isAssignableFrom(cl))
1734 return NO_FIELDS;
1735
1736 ObjectStreamField[] fields;
1737 if (cl.isRecord()) {
1738 fields = getDefaultSerialFields(cl);
1739 Arrays.sort(fields);
1740 } else if (!Externalizable.class.isAssignableFrom(cl) &&
1741 !Proxy.isProxyClass(cl) &&
1742 !cl.isInterface()) {
1743 if ((fields = getDeclaredSerialFields(cl)) == null) {
1744 fields = getDefaultSerialFields(cl);
1745 }
1746 Arrays.sort(fields);
1747 } else {
1748 fields = NO_FIELDS;
1749 }
1750 return fields;
1751 }
1752
1753 /**
1754 * Returns serializable fields of given class as defined explicitly by a
1755 * "serialPersistentFields" field, or null if no appropriate
1756 * "serialPersistentFields" field is defined. Serializable fields backed
1757 * by an actual field of the class are represented by ObjectStreamFields
1758 * with corresponding non-null Field objects. For compatibility with past
1759 * releases, a "serialPersistentFields" field with a null value is
1760 * considered equivalent to not declaring "serialPersistentFields". Throws
1761 * InvalidClassException if the declared serializable fields are
1762 * invalid--e.g., if multiple fields share the same name.
1763 */
1764 private static ObjectStreamField[] getDeclaredSerialFields(Class<?> cl)
1765 throws InvalidClassException
1766 {
1767 ObjectStreamField[] serialPersistentFields = null;
1768 try {
1769 Field f = cl.getDeclaredField("serialPersistentFields");
1770 int mask = Modifier.PRIVATE | Modifier.STATIC | Modifier.FINAL;
1771 if ((f.getModifiers() & mask) == mask) {
1772 f.setAccessible(true);
1773 serialPersistentFields = (ObjectStreamField[]) f.get(null);
1774 }
1775 } catch (Exception ex) {
1776 }
1777 if (serialPersistentFields == null) {
1778 return null;
1779 } else if (serialPersistentFields.length == 0) {
1780 return NO_FIELDS;
1781 }
1782
1783 ObjectStreamField[] boundFields =
1784 new ObjectStreamField[serialPersistentFields.length];
1785 Set<String> fieldNames = new HashSet<>(serialPersistentFields.length);
1786
1787 for (int i = 0; i < serialPersistentFields.length; i++) {
1788 ObjectStreamField spf = serialPersistentFields[i];
1789
1790 String fname = spf.getName();
1791 if (fieldNames.contains(fname)) {
1792 throw new InvalidClassException(
1793 "multiple serializable fields named " + fname);
1794 }
1795 fieldNames.add(fname);
1796
1797 try {
1798 Field f = cl.getDeclaredField(fname);
1799 if ((f.getType() == spf.getType()) &&
1800 ((f.getModifiers() & Modifier.STATIC) == 0))
1801 {
1802 boundFields[i] =
1803 new ObjectStreamField(f, spf.isUnshared(), true);
1804 }
1805 } catch (NoSuchFieldException ex) {
1806 }
1807 if (boundFields[i] == null) {
1808 boundFields[i] = new ObjectStreamField(
1809 fname, spf.getType(), spf.isUnshared());
1810 }
1811 }
1812 return boundFields;
1813 }
1814
1815 /**
1816 * Returns array of ObjectStreamFields corresponding to all non-static
1817 * non-transient fields declared by given class. Each ObjectStreamField
1818 * contains a Field object for the field it represents. If no default
1819 * serializable fields exist, NO_FIELDS is returned.
1820 */
1821 private static ObjectStreamField[] getDefaultSerialFields(Class<?> cl) {
1822 Field[] clFields = cl.getDeclaredFields();
1823 ArrayList<ObjectStreamField> list = new ArrayList<>();
1824 int mask = Modifier.STATIC | Modifier.TRANSIENT;
1825
1826 for (int i = 0; i < clFields.length; i++) {
1827 if ((clFields[i].getModifiers() & mask) == 0) {
1828 list.add(new ObjectStreamField(clFields[i], false, true));
1829 }
1830 }
1831 int size = list.size();
1832 return (size == 0) ? NO_FIELDS :
1833 list.toArray(new ObjectStreamField[size]);
1834 }
1835
1836 /**
1837 * Returns explicit serial version UID value declared by given class, or
1838 * null if none.
1839 */
1840 private static Long getDeclaredSUID(Class<?> cl) {
1841 try {
1842 Field f = cl.getDeclaredField("serialVersionUID");
1843 int mask = Modifier.STATIC | Modifier.FINAL;
1844 if ((f.getModifiers() & mask) == mask) {
1845 f.setAccessible(true);
1846 return f.getLong(null);
1847 }
1848 } catch (Exception ex) {
1849 }
1850 return null;
1851 }
1852
1853 /**
1854 * Computes the default serial version UID value for the given class.
1855 */
1856 private static long computeDefaultSUID(Class<?> cl) {
1857 if (!Serializable.class.isAssignableFrom(cl) || Proxy.isProxyClass(cl))
1858 {
1859 return 0L;
1860 }
1861
1862 try {
1863 ByteArrayOutputStream bout = new ByteArrayOutputStream();
1864 DataOutputStream dout = new DataOutputStream(bout);
1865
1866 dout.writeUTF(cl.getName());
1867
1868 int classMods = cl.getModifiers() &
1869 (Modifier.PUBLIC | Modifier.FINAL |
1870 Modifier.INTERFACE | Modifier.ABSTRACT);
1871
1872 /*
1873 * compensate for javac bug in which ABSTRACT bit was set for an
1874 * interface only if the interface declared methods
1875 */
1876 Method[] methods = cl.getDeclaredMethods();
1877 if ((classMods & Modifier.INTERFACE) != 0) {
1878 classMods = (methods.length > 0) ?
1879 (classMods | Modifier.ABSTRACT) :
1880 (classMods & ~Modifier.ABSTRACT);
1881 }
1882 dout.writeInt(classMods);
1883
1884 if (!cl.isArray()) {
1885 /*
1886 * compensate for change in 1.2FCS in which
1887 * Class.getInterfaces() was modified to return Cloneable and
1888 * Serializable for array classes.
1889 */
1890 Class<?>[] interfaces = cl.getInterfaces();
1891 String[] ifaceNames = new String[interfaces.length];
1892 for (int i = 0; i < interfaces.length; i++) {
1893 ifaceNames[i] = interfaces[i].getName();
1894 }
1895 Arrays.sort(ifaceNames);
1896 // Skip IdentityObject to keep the computed SVUID the same.
1897 for (int i = 0; i < ifaceNames.length; i++) {
1898 if (!"java.lang.IdentityObject".equals(ifaceNames[i]))
1899 dout.writeUTF(ifaceNames[i]);
1900 }
1901 }
1902
1903 Field[] fields = cl.getDeclaredFields();
1904 MemberSignature[] fieldSigs = new MemberSignature[fields.length];
1905 for (int i = 0; i < fields.length; i++) {
1906 fieldSigs[i] = new MemberSignature(fields[i]);
1907 }
1908 Arrays.sort(fieldSigs, new Comparator<>() {
1909 public int compare(MemberSignature ms1, MemberSignature ms2) {
1910 return ms1.name.compareTo(ms2.name);
1911 }
1912 });
1913 for (int i = 0; i < fieldSigs.length; i++) {
1914 MemberSignature sig = fieldSigs[i];
1915 int mods = sig.member.getModifiers() &
1916 (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
1917 Modifier.STATIC | Modifier.FINAL | Modifier.VOLATILE |
1918 Modifier.TRANSIENT);
1919 if (((mods & Modifier.PRIVATE) == 0) ||
1920 ((mods & (Modifier.STATIC | Modifier.TRANSIENT)) == 0))
1921 {
1922 dout.writeUTF(sig.name);
1923 dout.writeInt(mods);
1924 dout.writeUTF(sig.signature);
1925 }
1926 }
1927
1928 if (hasStaticInitializer(cl)) {
1929 dout.writeUTF("<clinit>");
1930 dout.writeInt(Modifier.STATIC);
1931 dout.writeUTF("()V");
1932 }
1933
1934 Constructor<?>[] cons = cl.getDeclaredConstructors();
1935 MemberSignature[] consSigs = new MemberSignature[cons.length];
1936 for (int i = 0; i < cons.length; i++) {
1937 consSigs[i] = new MemberSignature(cons[i]);
1938 }
1939 Arrays.sort(consSigs, new Comparator<>() {
1940 public int compare(MemberSignature ms1, MemberSignature ms2) {
1941 return ms1.signature.compareTo(ms2.signature);
1942 }
1943 });
1944 for (int i = 0; i < consSigs.length; i++) {
1945 MemberSignature sig = consSigs[i];
1946 int mods = sig.member.getModifiers() &
1947 (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
1948 Modifier.STATIC | Modifier.FINAL |
1949 Modifier.SYNCHRONIZED | Modifier.NATIVE |
1950 Modifier.ABSTRACT | Modifier.STRICT);
1951 if ((mods & Modifier.PRIVATE) == 0) {
1952 dout.writeUTF("<init>");
1953 dout.writeInt(mods);
1954 dout.writeUTF(sig.signature.replace('/', '.'));
1955 }
1956 }
1957
1958 MemberSignature[] methSigs = new MemberSignature[methods.length];
1959 for (int i = 0; i < methods.length; i++) {
1960 methSigs[i] = new MemberSignature(methods[i]);
1961 }
1962 Arrays.sort(methSigs, new Comparator<>() {
1963 public int compare(MemberSignature ms1, MemberSignature ms2) {
1964 int comp = ms1.name.compareTo(ms2.name);
1965 if (comp == 0) {
1966 comp = ms1.signature.compareTo(ms2.signature);
1967 }
1968 return comp;
1969 }
1970 });
1971 for (int i = 0; i < methSigs.length; i++) {
1972 MemberSignature sig = methSigs[i];
1973 int mods = sig.member.getModifiers() &
1974 (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
1975 Modifier.STATIC | Modifier.FINAL |
1976 Modifier.SYNCHRONIZED | Modifier.NATIVE |
1977 Modifier.ABSTRACT | Modifier.STRICT);
1978 if ((mods & Modifier.PRIVATE) == 0) {
1979 dout.writeUTF(sig.name);
1980 dout.writeInt(mods);
1981 dout.writeUTF(sig.signature.replace('/', '.'));
1982 }
1983 }
1984
1985 dout.flush();
1986
1987 MessageDigest md = MessageDigest.getInstance("SHA");
1988 byte[] hashBytes = md.digest(bout.toByteArray());
1989 long hash = 0;
1990 for (int i = Math.min(hashBytes.length, 8) - 1; i >= 0; i--) {
1991 hash = (hash << 8) | (hashBytes[i] & 0xFF);
1992 }
1993 return hash;
1994 } catch (IOException ex) {
1995 throw new InternalError(ex);
1996 } catch (NoSuchAlgorithmException ex) {
1997 throw new SecurityException(ex.getMessage());
1998 }
1999 }
2000
2001 /**
2002 * Returns true if the given class defines a static initializer method,
2003 * false otherwise.
2004 */
2005 private static native boolean hasStaticInitializer(Class<?> cl);
2006
2007 /**
2008 * Class for computing and caching field/constructor/method signatures
2009 * during serialVersionUID calculation.
2010 */
2011 private static class MemberSignature {
2012
2013 public final Member member;
2014 public final String name;
2015 public final String signature;
2016
2017 public MemberSignature(Field field) {
2018 member = field;
2019 name = field.getName();
2020 signature = getClassSignature(field.getType());
2021 }
2022
2023 public MemberSignature(Constructor<?> cons) {
2024 member = cons;
2025 name = cons.getName();
2026 signature = getMethodSignature(
2027 cons.getParameterTypes(), Void.TYPE);
2028 }
2029
2030 public MemberSignature(Method meth) {
2031 member = meth;
2032 name = meth.getName();
2033 signature = getMethodSignature(
2034 meth.getParameterTypes(), meth.getReturnType());
2035 }
2036 }
2037
2038 /**
2039 * Class for setting and retrieving serializable field values in batch.
2040 */
2041 // REMIND: dynamically generate these?
2042 private static class FieldReflector {
2043
2044 /** handle for performing unsafe operations */
2045 private static final Unsafe unsafe = Unsafe.getUnsafe();
2046
2047 /** fields to operate on */
2048 private final ObjectStreamField[] fields;
2049 /** number of primitive fields */
2050 private final int numPrimFields;
2051 /** unsafe field keys for reading fields - may contain dupes */
2052 private final long[] readKeys;
2053 /** unsafe fields keys for writing fields - no dupes */
2054 private final long[] writeKeys;
2055 /** field data offsets */
2056 private final int[] offsets;
2057 /** field type codes */
2058 private final char[] typeCodes;
2059 /** field types */
2060 private final Class<?>[] types;
2061
2062 /**
2063 * Constructs FieldReflector capable of setting/getting values from the
2064 * subset of fields whose ObjectStreamFields contain non-null
2065 * reflective Field objects. ObjectStreamFields with null Fields are
2066 * treated as filler, for which get operations return default values
2067 * and set operations discard given values.
2068 */
2069 FieldReflector(ObjectStreamField[] fields) {
2070 this.fields = fields;
2071 int nfields = fields.length;
2072 readKeys = new long[nfields];
2073 writeKeys = new long[nfields];
2074 offsets = new int[nfields];
2075 typeCodes = new char[nfields];
2076 ArrayList<Class<?>> typeList = new ArrayList<>();
2077 Set<Long> usedKeys = new HashSet<>();
2078
2079
2080 for (int i = 0; i < nfields; i++) {
2081 ObjectStreamField f = fields[i];
2082 Field rf = f.getField();
2083 long key = (rf != null) ?
2084 unsafe.objectFieldOffset(rf) : Unsafe.INVALID_FIELD_OFFSET;
2085 readKeys[i] = key;
2086 writeKeys[i] = usedKeys.add(key) ?
2087 key : Unsafe.INVALID_FIELD_OFFSET;
2088 offsets[i] = f.getOffset();
2089 typeCodes[i] = f.getTypeCode();
2090 if (!f.isPrimitive()) {
2091 typeList.add((rf != null) ? rf.getType() : null);
2092 }
2093 }
2094
2095 types = typeList.toArray(new Class<?>[typeList.size()]);
2096 numPrimFields = nfields - types.length;
2097 }
2098
2099 /**
2100 * Returns list of ObjectStreamFields representing fields operated on
2101 * by this reflector. The shared/unshared values and Field objects
2102 * contained by ObjectStreamFields in the list reflect their bindings
2103 * to locally defined serializable fields.
2104 */
2105 ObjectStreamField[] getFields() {
2106 return fields;
2107 }
2108
2109 /**
2110 * Fetches the serializable primitive field values of object obj and
2111 * marshals them into byte array buf starting at offset 0. The caller
2112 * is responsible for ensuring that obj is of the proper type.
2113 */
2114 void getPrimFieldValues(Object obj, byte[] buf) {
2115 if (obj == null) {
2116 throw new NullPointerException();
2117 }
2118 /* assuming checkDefaultSerialize() has been called on the class
2119 * descriptor this FieldReflector was obtained from, no field keys
2120 * in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
2121 */
2122 for (int i = 0; i < numPrimFields; i++) {
2123 long key = readKeys[i];
2124 int off = offsets[i];
2125 switch (typeCodes[i]) {
2126 case 'Z' -> Bits.putBoolean(buf, off, unsafe.getBoolean(obj, key));
2127 case 'B' -> buf[off] = unsafe.getByte(obj, key);
2128 case 'C' -> Bits.putChar(buf, off, unsafe.getChar(obj, key));
2129 case 'S' -> Bits.putShort(buf, off, unsafe.getShort(obj, key));
2130 case 'I' -> Bits.putInt(buf, off, unsafe.getInt(obj, key));
2131 case 'F' -> Bits.putFloat(buf, off, unsafe.getFloat(obj, key));
2132 case 'J' -> Bits.putLong(buf, off, unsafe.getLong(obj, key));
2133 case 'D' -> Bits.putDouble(buf, off, unsafe.getDouble(obj, key));
2134 default -> throw new InternalError();
2135 }
2136 }
2137 }
2138
2139 /**
2140 * Sets the serializable primitive fields of object obj using values
2141 * unmarshalled from byte array buf starting at offset 0. The caller
2142 * is responsible for ensuring that obj is of the proper type.
2143 */
2144 void setPrimFieldValues(Object obj, byte[] buf) {
2145 if (obj == null) {
2146 throw new NullPointerException();
2147 }
2148 for (int i = 0; i < numPrimFields; i++) {
2149 long key = writeKeys[i];
2150 if (key == Unsafe.INVALID_FIELD_OFFSET) {
2151 continue; // discard value
2152 }
2153 int off = offsets[i];
2154 switch (typeCodes[i]) {
2155 case 'Z' -> unsafe.putBoolean(obj, key, Bits.getBoolean(buf, off));
2156 case 'B' -> unsafe.putByte(obj, key, buf[off]);
2157 case 'C' -> unsafe.putChar(obj, key, Bits.getChar(buf, off));
2158 case 'S' -> unsafe.putShort(obj, key, Bits.getShort(buf, off));
2159 case 'I' -> unsafe.putInt(obj, key, Bits.getInt(buf, off));
2160 case 'F' -> unsafe.putFloat(obj, key, Bits.getFloat(buf, off));
2161 case 'J' -> unsafe.putLong(obj, key, Bits.getLong(buf, off));
2162 case 'D' -> unsafe.putDouble(obj, key, Bits.getDouble(buf, off));
2163 default -> throw new InternalError();
2164 }
2165 }
2166 }
2167
2168 /**
2169 * Fetches the serializable object field values of object obj and
2170 * stores them in array vals starting at offset 0. The caller is
2171 * responsible for ensuring that obj is of the proper type.
2172 */
2173 void getObjFieldValues(Object obj, Object[] vals) {
2174 if (obj == null) {
2175 throw new NullPointerException();
2176 }
2177 /* assuming checkDefaultSerialize() has been called on the class
2178 * descriptor this FieldReflector was obtained from, no field keys
2179 * in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
2180 */
2181 for (int i = numPrimFields; i < fields.length; i++) {
2182 vals[offsets[i]] = switch (typeCodes[i]) {
2183 case 'L', '[' -> unsafe.getReference(obj, readKeys[i]);
2184 default -> throw new InternalError();
2185 };
2186 }
2187 }
2188
2189 /**
2190 * Checks that the given values, from array vals starting at offset 0,
2191 * are assignable to the given serializable object fields.
2192 * @throws ClassCastException if any value is not assignable
2193 */
2194 void checkObjectFieldValueTypes(Object obj, Object[] vals) {
2195 setObjFieldValues(obj, vals, true);
2196 }
2197
2198 /**
2199 * Sets the serializable object fields of object obj using values from
2200 * array vals starting at offset 0. The caller is responsible for
2201 * ensuring that obj is of the proper type; however, attempts to set a
2202 * field with a value of the wrong type will trigger an appropriate
2203 * ClassCastException.
2204 */
2205 void setObjFieldValues(Object obj, Object[] vals) {
2206 setObjFieldValues(obj, vals, false);
2207 }
2208
2209 private void setObjFieldValues(Object obj, Object[] vals, boolean dryRun) {
2210 if (obj == null) {
2211 throw new NullPointerException();
2212 }
2213 for (int i = numPrimFields; i < fields.length; i++) {
2214 long key = writeKeys[i];
2215 if (key == Unsafe.INVALID_FIELD_OFFSET) {
2216 continue; // discard value
2217 }
2218 switch (typeCodes[i]) {
2219 case 'L', '[' -> {
2220 Object val = vals[offsets[i]];
2221 if (val != null &&
2222 !types[i - numPrimFields].isInstance(val))
2223 {
2224 Field f = fields[i].getField();
2225 throw new ClassCastException(
2226 "cannot assign instance of " +
2227 val.getClass().getName() + " to field " +
2228 f.getDeclaringClass().getName() + "." +
2229 f.getName() + " of type " +
2230 f.getType().getName() + " in instance of " +
2231 obj.getClass().getName());
2232 }
2233 if (!dryRun)
2234 unsafe.putReference(obj, key, val);
2235 }
2236 default -> throw new InternalError();
2237 }
2238 }
2239 }
2240 }
2241
2242 /**
2243 * Matches given set of serializable fields with serializable fields
2244 * described by the given local class descriptor, and returns a
2245 * FieldReflector instance capable of setting/getting values from the
2246 * subset of fields that match (non-matching fields are treated as filler,
2247 * for which get operations return default values and set operations
2248 * discard given values). Throws InvalidClassException if unresolvable
2249 * type conflicts exist between the two sets of fields.
2250 */
2251 private static FieldReflector getReflector(ObjectStreamField[] fields,
2252 ObjectStreamClass localDesc)
2253 throws InvalidClassException
2254 {
2255 // class irrelevant if no fields
2256 Class<?> cl = (localDesc != null && fields.length > 0) ?
2257 localDesc.cl : null;
2258 processQueue(Caches.reflectorsQueue, Caches.reflectors);
2259 FieldReflectorKey key = new FieldReflectorKey(cl, fields,
2260 Caches.reflectorsQueue);
2261 Reference<?> ref = Caches.reflectors.get(key);
2262 Object entry = null;
2263 if (ref != null) {
2264 entry = ref.get();
2265 }
2266 EntryFuture future = null;
2267 if (entry == null) {
2268 EntryFuture newEntry = new EntryFuture();
2269 Reference<?> newRef = new SoftReference<>(newEntry);
2270 do {
2271 if (ref != null) {
2272 Caches.reflectors.remove(key, ref);
2273 }
2274 ref = Caches.reflectors.putIfAbsent(key, newRef);
2275 if (ref != null) {
2276 entry = ref.get();
2277 }
2278 } while (ref != null && entry == null);
2279 if (entry == null) {
2280 future = newEntry;
2281 }
2282 }
2283
2284 if (entry instanceof FieldReflector) { // check common case first
2285 return (FieldReflector) entry;
2286 } else if (entry instanceof EntryFuture) {
2287 entry = ((EntryFuture) entry).get();
2288 } else if (entry == null) {
2289 try {
2290 entry = new FieldReflector(matchFields(fields, localDesc));
2291 } catch (Throwable th) {
2292 entry = th;
2293 }
2294 future.set(entry);
2295 Caches.reflectors.put(key, new SoftReference<>(entry));
2296 }
2297
2298 if (entry instanceof FieldReflector) {
2299 return (FieldReflector) entry;
2300 } else if (entry instanceof InvalidClassException) {
2301 throw (InvalidClassException) entry;
2302 } else if (entry instanceof RuntimeException) {
2303 throw (RuntimeException) entry;
2304 } else if (entry instanceof Error) {
2305 throw (Error) entry;
2306 } else {
2307 throw new InternalError("unexpected entry: " + entry);
2308 }
2309 }
2310
2311 /**
2312 * FieldReflector cache lookup key. Keys are considered equal if they
2313 * refer to the same class and equivalent field formats.
2314 */
2315 private static class FieldReflectorKey extends WeakReference<Class<?>> {
2316
2317 private final String[] sigs;
2318 private final int hash;
2319 private final boolean nullClass;
2320
2321 FieldReflectorKey(Class<?> cl, ObjectStreamField[] fields,
2322 ReferenceQueue<Class<?>> queue)
2323 {
2324 super(cl, queue);
2325 nullClass = (cl == null);
2326 sigs = new String[2 * fields.length];
2327 for (int i = 0, j = 0; i < fields.length; i++) {
2328 ObjectStreamField f = fields[i];
2329 sigs[j++] = f.getName();
2330 sigs[j++] = f.getSignature();
2331 }
2332 hash = System.identityHashCode(cl) + Arrays.hashCode(sigs);
2333 }
2334
2335 public int hashCode() {
2336 return hash;
2337 }
2338
2339 public boolean equals(Object obj) {
2340 if (obj == this) {
2341 return true;
2342 }
2343
2344 if (obj instanceof FieldReflectorKey other) {
2345 Class<?> referent;
2346 return (nullClass ? other.nullClass
2347 : ((referent = get()) != null) &&
2348 (other.refersTo(referent))) &&
2349 Arrays.equals(sigs, other.sigs);
2350 } else {
2351 return false;
2352 }
2353 }
2354 }
2355
2356 /**
2357 * Matches given set of serializable fields with serializable fields
2358 * obtained from the given local class descriptor (which contain bindings
2359 * to reflective Field objects). Returns list of ObjectStreamFields in
2360 * which each ObjectStreamField whose signature matches that of a local
2361 * field contains a Field object for that field; unmatched
2362 * ObjectStreamFields contain null Field objects. Shared/unshared settings
2363 * of the returned ObjectStreamFields also reflect those of matched local
2364 * ObjectStreamFields. Throws InvalidClassException if unresolvable type
2365 * conflicts exist between the two sets of fields.
2366 */
2367 private static ObjectStreamField[] matchFields(ObjectStreamField[] fields,
2368 ObjectStreamClass localDesc)
2369 throws InvalidClassException
2370 {
2371 ObjectStreamField[] localFields = (localDesc != null) ?
2372 localDesc.fields : NO_FIELDS;
2373
2374 /*
2375 * Even if fields == localFields, we cannot simply return localFields
2376 * here. In previous implementations of serialization,
2377 * ObjectStreamField.getType() returned Object.class if the
2378 * ObjectStreamField represented a non-primitive field and belonged to
2379 * a non-local class descriptor. To preserve this (questionable)
2380 * behavior, the ObjectStreamField instances returned by matchFields
2381 * cannot report non-primitive types other than Object.class; hence
2382 * localFields cannot be returned directly.
2383 */
2384
2385 ObjectStreamField[] matches = new ObjectStreamField[fields.length];
2386 for (int i = 0; i < fields.length; i++) {
2387 ObjectStreamField f = fields[i], m = null;
2388 for (int j = 0; j < localFields.length; j++) {
2389 ObjectStreamField lf = localFields[j];
2390 if (f.getName().equals(lf.getName())) {
2391 if ((f.isPrimitive() || lf.isPrimitive()) &&
2392 f.getTypeCode() != lf.getTypeCode())
2393 {
2394 throw new InvalidClassException(localDesc.name,
2395 "incompatible types for field " + f.getName());
2396 }
2397 if (lf.getField() != null) {
2398 m = new ObjectStreamField(
2399 lf.getField(), lf.isUnshared(), false);
2400 } else {
2401 m = new ObjectStreamField(
2402 lf.getName(), lf.getSignature(), lf.isUnshared());
2403 }
2404 }
2405 }
2406 if (m == null) {
2407 m = new ObjectStreamField(
2408 f.getName(), f.getSignature(), false);
2409 }
2410 m.setOffset(f.getOffset());
2411 matches[i] = m;
2412 }
2413 return matches;
2414 }
2415
2416 /**
2417 * Removes from the specified map any keys that have been enqueued
2418 * on the specified reference queue.
2419 */
2420 static void processQueue(ReferenceQueue<Class<?>> queue,
2421 ConcurrentMap<? extends
2422 WeakReference<Class<?>>, ?> map)
2423 {
2424 Reference<? extends Class<?>> ref;
2425 while((ref = queue.poll()) != null) {
2426 map.remove(ref);
2427 }
2428 }
2429
2430 /**
2431 * Weak key for Class objects.
2432 *
2433 **/
2434 static class WeakClassKey extends WeakReference<Class<?>> {
2435 /**
2436 * saved value of the referent's identity hash code, to maintain
2437 * a consistent hash code after the referent has been cleared
2438 */
2439 private final int hash;
2440
2441 /**
2442 * Create a new WeakClassKey to the given object, registered
2443 * with a queue.
2444 */
2445 WeakClassKey(Class<?> cl, ReferenceQueue<Class<?>> refQueue) {
2446 super(cl, refQueue);
2447 hash = System.identityHashCode(cl);
2448 }
2449
2450 /**
2451 * Returns the identity hash code of the original referent.
2452 */
2453 public int hashCode() {
2454 return hash;
2455 }
2456
2457 /**
2458 * Returns true if the given object is this identical
2459 * WeakClassKey instance, or, if this object's referent has not
2460 * been cleared, if the given object is another WeakClassKey
2461 * instance with the identical non-null referent as this one.
2462 */
2463 public boolean equals(Object obj) {
2464 if (obj == this) {
2465 return true;
2466 }
2467
2468 if (obj instanceof WeakClassKey) {
2469 Class<?> referent = get();
2470 return (referent != null) &&
2471 (((WeakClassKey) obj).refersTo(referent));
2472 } else {
2473 return false;
2474 }
2475 }
2476 }
2477
2478 /**
2479 * A LRA cache of record deserialization constructors.
2480 */
2481 @SuppressWarnings("serial")
2482 private static final class DeserializationConstructorsCache
2483 extends ConcurrentHashMap<DeserializationConstructorsCache.Key, MethodHandle> {
2484
2485 // keep max. 10 cached entries - when the 11th element is inserted the oldest
2486 // is removed and 10 remains - 11 is the biggest map size where internal
2487 // table of 16 elements is sufficient (inserting 12th element would resize it to 32)
2488 private static final int MAX_SIZE = 10;
2489 private Key.Impl first, last; // first and last in FIFO queue
2490
2491 DeserializationConstructorsCache() {
2492 // start small - if there is more than one shape of ObjectStreamClass
2493 // deserialized, there will typically be two (current version and previous version)
2494 super(2);
2495 }
2496
2497 MethodHandle get(ObjectStreamField[] fields) {
2498 return get(new Key.Lookup(fields));
2499 }
2500
2501 synchronized MethodHandle putIfAbsentAndGet(ObjectStreamField[] fields, MethodHandle mh) {
2502 Key.Impl key = new Key.Impl(fields);
2503 var oldMh = putIfAbsent(key, mh);
2504 if (oldMh != null) return oldMh;
2505 // else we did insert new entry -> link the new key as last
2506 if (last == null) {
2507 last = first = key;
2508 } else {
2509 last = (last.next = key);
2510 }
2511 // may need to remove first
2512 if (size() > MAX_SIZE) {
2513 assert first != null;
2514 remove(first);
2515 first = first.next;
2516 if (first == null) {
2517 last = null;
2518 }
2519 }
2520 return mh;
2521 }
2522
2523 // a key composed of ObjectStreamField[] names and types
2524 static abstract class Key {
2525 abstract int length();
2526 abstract String fieldName(int i);
2527 abstract Class<?> fieldType(int i);
2528
2529 @Override
2530 public final int hashCode() {
2531 int n = length();
2532 int h = 0;
2533 for (int i = 0; i < n; i++) h = h * 31 + fieldType(i).hashCode();
2534 for (int i = 0; i < n; i++) h = h * 31 + fieldName(i).hashCode();
2535 return h;
2536 }
2537
2538 @Override
2539 public final boolean equals(Object obj) {
2540 if (!(obj instanceof Key other)) return false;
2541 int n = length();
2542 if (n != other.length()) return false;
2543 for (int i = 0; i < n; i++) if (fieldType(i) != other.fieldType(i)) return false;
2544 for (int i = 0; i < n; i++) if (!fieldName(i).equals(other.fieldName(i))) return false;
2545 return true;
2546 }
2547
2548 // lookup key - just wraps ObjectStreamField[]
2549 static final class Lookup extends Key {
2550 final ObjectStreamField[] fields;
2551
2552 Lookup(ObjectStreamField[] fields) { this.fields = fields; }
2553
2554 @Override
2555 int length() { return fields.length; }
2556
2557 @Override
2558 String fieldName(int i) { return fields[i].getName(); }
2559
2560 @Override
2561 Class<?> fieldType(int i) { return fields[i].getType(); }
2562 }
2563
2564 // real key - copies field names and types and forms FIFO queue in cache
2565 static final class Impl extends Key {
2566 Impl next;
2567 final String[] fieldNames;
2568 final Class<?>[] fieldTypes;
2569
2570 Impl(ObjectStreamField[] fields) {
2571 this.fieldNames = new String[fields.length];
2572 this.fieldTypes = new Class<?>[fields.length];
2573 for (int i = 0; i < fields.length; i++) {
2574 fieldNames[i] = fields[i].getName();
2575 fieldTypes[i] = fields[i].getType();
2576 }
2577 }
2578
2579 @Override
2580 int length() { return fieldNames.length; }
2581
2582 @Override
2583 String fieldName(int i) { return fieldNames[i]; }
2584
2585 @Override
2586 Class<?> fieldType(int i) { return fieldTypes[i]; }
2587 }
2588 }
2589 }
2590
2591 /** Record specific support for retrieving and binding stream field values. */
2592 static final class RecordSupport {
2593 /**
2594 * Returns canonical record constructor adapted to take two arguments:
2595 * {@code (byte[] primValues, Object[] objValues)}
2596 * and return
2597 * {@code Object}
2598 */
2599 @SuppressWarnings("removal")
2600 static MethodHandle deserializationCtr(ObjectStreamClass desc) {
2601 // check the cached value 1st
2602 MethodHandle mh = desc.deserializationCtr;
2603 if (mh != null) return mh;
2604 mh = desc.deserializationCtrs.get(desc.getFields(false));
2605 if (mh != null) return desc.deserializationCtr = mh;
2606
2607 // retrieve record components
2608 RecordComponent[] recordComponents;
2609 try {
2610 Class<?> cls = desc.forClass();
2611 PrivilegedExceptionAction<RecordComponent[]> pa = cls::getRecordComponents;
2612 recordComponents = AccessController.doPrivileged(pa);
2613 } catch (PrivilegedActionException e) {
2614 throw new InternalError(e.getCause());
2615 }
2616
2617 // retrieve the canonical constructor
2618 // (T1, T2, ..., Tn):TR
2619 mh = desc.getRecordConstructor();
2620
2621 // change return type to Object
2622 // (T1, T2, ..., Tn):TR -> (T1, T2, ..., Tn):Object
2623 mh = mh.asType(mh.type().changeReturnType(Object.class));
2624
2625 // drop last 2 arguments representing primValues and objValues arrays
2626 // (T1, T2, ..., Tn):Object -> (T1, T2, ..., Tn, byte[], Object[]):Object
2627 mh = MethodHandles.dropArguments(mh, mh.type().parameterCount(), byte[].class, Object[].class);
2628
2629 for (int i = recordComponents.length-1; i >= 0; i--) {
2630 String name = recordComponents[i].getName();
2631 Class<?> type = recordComponents[i].getType();
2632 // obtain stream field extractor that extracts argument at
2633 // position i (Ti+1) from primValues and objValues arrays
2634 // (byte[], Object[]):Ti+1
2635 MethodHandle combiner = streamFieldExtractor(name, type, desc);
2636 // fold byte[] privValues and Object[] objValues into argument at position i (Ti+1)
2637 // (..., Ti, Ti+1, byte[], Object[]):Object -> (..., Ti, byte[], Object[]):Object
2638 mh = MethodHandles.foldArguments(mh, i, combiner);
2639 }
2640 // what we are left with is a MethodHandle taking just the primValues
2641 // and objValues arrays and returning the constructed record instance
2642 // (byte[], Object[]):Object
2643
2644 // store it into cache and return the 1st value stored
2645 return desc.deserializationCtr =
2646 desc.deserializationCtrs.putIfAbsentAndGet(desc.getFields(false), mh);
2647 }
2648
2649 /** Returns the number of primitive fields for the given descriptor. */
2650 private static int numberPrimValues(ObjectStreamClass desc) {
2651 ObjectStreamField[] fields = desc.getFields();
2652 int primValueCount = 0;
2653 for (int i = 0; i < fields.length; i++) {
2654 if (fields[i].isPrimitive())
2655 primValueCount++;
2656 else
2657 break; // can be no more
2658 }
2659 return primValueCount;
2660 }
2661
2662 /**
2663 * Returns extractor MethodHandle taking the primValues and objValues arrays
2664 * and extracting the argument of canonical constructor with given name and type
2665 * or producing default value for the given type if the field is absent.
2666 */
2667 private static MethodHandle streamFieldExtractor(String pName,
2668 Class<?> pType,
2669 ObjectStreamClass desc) {
2670 ObjectStreamField[] fields = desc.getFields(false);
2671
2672 for (int i = 0; i < fields.length; i++) {
2673 ObjectStreamField f = fields[i];
2674 String fName = f.getName();
2675 if (!fName.equals(pName))
2676 continue;
2677
2678 Class<?> fType = f.getField().getType();
2679 if (!pType.isAssignableFrom(fType))
2680 throw new InternalError(fName + " unassignable, pType:" + pType + ", fType:" + fType);
2681
2682 if (f.isPrimitive()) {
2683 // (byte[], int):fType
2684 MethodHandle mh = PRIM_VALUE_EXTRACTORS.get(fType);
2685 if (mh == null) {
2686 throw new InternalError("Unexpected type: " + fType);
2687 }
2688 // bind offset
2689 // (byte[], int):fType -> (byte[]):fType
2690 mh = MethodHandles.insertArguments(mh, 1, f.getOffset());
2691 // drop objValues argument
2692 // (byte[]):fType -> (byte[], Object[]):fType
2693 mh = MethodHandles.dropArguments(mh, 1, Object[].class);
2694 // adapt return type to pType
2695 // (byte[], Object[]):fType -> (byte[], Object[]):pType
2696 if (pType != fType) {
2697 mh = mh.asType(mh.type().changeReturnType(pType));
2698 }
2699 return mh;
2700 } else { // reference
2701 // (Object[], int):Object
2702 MethodHandle mh = MethodHandles.arrayElementGetter(Object[].class);
2703 // bind index
2704 // (Object[], int):Object -> (Object[]):Object
2705 mh = MethodHandles.insertArguments(mh, 1, i - numberPrimValues(desc));
2706 // drop primValues argument
2707 // (Object[]):Object -> (byte[], Object[]):Object
2708 mh = MethodHandles.dropArguments(mh, 0, byte[].class);
2709 // adapt return type to pType
2710 // (byte[], Object[]):Object -> (byte[], Object[]):pType
2711 if (pType != Object.class) {
2712 mh = mh.asType(mh.type().changeReturnType(pType));
2713 }
2714 return mh;
2715 }
2716 }
2717
2718 // return default value extractor if no field matches pName
2719 return MethodHandles.empty(MethodType.methodType(pType, byte[].class, Object[].class));
2720 }
2721
2722 private static final Map<Class<?>, MethodHandle> PRIM_VALUE_EXTRACTORS;
2723 static {
2724 var lkp = MethodHandles.lookup();
2725 try {
2726 PRIM_VALUE_EXTRACTORS = Map.of(
2727 byte.class, MethodHandles.arrayElementGetter(byte[].class),
2728 short.class, lkp.findStatic(Bits.class, "getShort", MethodType.methodType(short.class, byte[].class, int.class)),
2729 int.class, lkp.findStatic(Bits.class, "getInt", MethodType.methodType(int.class, byte[].class, int.class)),
2730 long.class, lkp.findStatic(Bits.class, "getLong", MethodType.methodType(long.class, byte[].class, int.class)),
2731 float.class, lkp.findStatic(Bits.class, "getFloat", MethodType.methodType(float.class, byte[].class, int.class)),
2732 double.class, lkp.findStatic(Bits.class, "getDouble", MethodType.methodType(double.class, byte[].class, int.class)),
2733 char.class, lkp.findStatic(Bits.class, "getChar", MethodType.methodType(char.class, byte[].class, int.class)),
2734 boolean.class, lkp.findStatic(Bits.class, "getBoolean", MethodType.methodType(boolean.class, byte[].class, int.class))
2735 );
2736 } catch (NoSuchMethodException | IllegalAccessException e) {
2737 throw new InternalError("Can't lookup Bits.getXXX", e);
2738 }
2739 }
2740 }
2741 }