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⏎ java/io/ObjectStreamClass.java
/*
* Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
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*
*/
package java.io;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.RecordComponent;
import java.lang.reflect.UndeclaredThrowableException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PermissionCollection;
import java.security.Permissions;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import jdk.internal.misc.Unsafe;
import jdk.internal.reflect.CallerSensitive;
import jdk.internal.reflect.Reflection;
import jdk.internal.reflect.ReflectionFactory;
import jdk.internal.access.SharedSecrets;
import jdk.internal.access.JavaSecurityAccess;
import sun.reflect.misc.ReflectUtil;
import static java.io.ObjectStreamField.*;
/**
* Serialization's descriptor for classes. It contains the name and
* serialVersionUID of the class. The ObjectStreamClass for a specific class
* loaded in this Java VM can be found/created using the lookup method.
*
* <p>The algorithm to compute the SerialVersionUID is described in
* <a href="{@docRoot}/../specs/serialization/class.html#stream-unique-identifiers">
* <cite>Java Object Serialization Specification,</cite> Section 4.6, "Stream Unique Identifiers"</a>.
*
* @author Mike Warres
* @author Roger Riggs
* @see ObjectStreamField
* @see <a href="{@docRoot}/../specs/serialization/class.html">
* <cite>Java Object Serialization Specification,</cite> Section 4, "Class Descriptors"</a>
* @since 1.1
*/
public class ObjectStreamClass implements Serializable {
/** serialPersistentFields value indicating no serializable fields */
public static final ObjectStreamField[] NO_FIELDS =
new ObjectStreamField[0];
@java.io.Serial
private static final long serialVersionUID = -6120832682080437368L;
/**
* {@code ObjectStreamClass} has no fields for default serialization.
*/
@java.io.Serial
private static final ObjectStreamField[] serialPersistentFields =
NO_FIELDS;
/** reflection factory for obtaining serialization constructors */
@SuppressWarnings("removal")
private static final ReflectionFactory reflFactory =
AccessController.doPrivileged(
new ReflectionFactory.GetReflectionFactoryAction());
private static class Caches {
/** cache mapping local classes -> descriptors */
static final ConcurrentMap<WeakClassKey,Reference<?>> localDescs =
new ConcurrentHashMap<>();
/** cache mapping field group/local desc pairs -> field reflectors */
static final ConcurrentMap<FieldReflectorKey,Reference<?>> reflectors =
new ConcurrentHashMap<>();
/** queue for WeakReferences to local classes */
private static final ReferenceQueue<Class<?>> localDescsQueue =
new ReferenceQueue<>();
/** queue for WeakReferences to field reflectors keys */
private static final ReferenceQueue<Class<?>> reflectorsQueue =
new ReferenceQueue<>();
}
/** class associated with this descriptor (if any) */
private Class<?> cl;
/** name of class represented by this descriptor */
private String name;
/** serialVersionUID of represented class (null if not computed yet) */
private volatile Long suid;
/** true if represents dynamic proxy class */
private boolean isProxy;
/** true if represents enum type */
private boolean isEnum;
/** true if represents record type */
private boolean isRecord;
/** true if represented class implements Serializable */
private boolean serializable;
/** true if represented class implements Externalizable */
private boolean externalizable;
/** true if desc has data written by class-defined writeObject method */
private boolean hasWriteObjectData;
/**
* true if desc has externalizable data written in block data format; this
* must be true by default to accommodate ObjectInputStream subclasses which
* override readClassDescriptor() to return class descriptors obtained from
* ObjectStreamClass.lookup() (see 4461737)
*/
private boolean hasBlockExternalData = true;
/**
* Contains information about InvalidClassException instances to be thrown
* when attempting operations on an invalid class. Note that instances of
* this class are immutable and are potentially shared among
* ObjectStreamClass instances.
*/
private static class ExceptionInfo {
private final String className;
private final String message;
ExceptionInfo(String cn, String msg) {
className = cn;
message = msg;
}
/**
* Returns (does not throw) an InvalidClassException instance created
* from the information in this object, suitable for being thrown by
* the caller.
*/
InvalidClassException newInvalidClassException() {
return new InvalidClassException(className, message);
}
}
/** exception (if any) thrown while attempting to resolve class */
private ClassNotFoundException resolveEx;
/** exception (if any) to throw if non-enum deserialization attempted */
private ExceptionInfo deserializeEx;
/** exception (if any) to throw if non-enum serialization attempted */
private ExceptionInfo serializeEx;
/** exception (if any) to throw if default serialization attempted */
private ExceptionInfo defaultSerializeEx;
/** serializable fields */
private ObjectStreamField[] fields;
/** aggregate marshalled size of primitive fields */
private int primDataSize;
/** number of non-primitive fields */
private int numObjFields;
/** reflector for setting/getting serializable field values */
private FieldReflector fieldRefl;
/** data layout of serialized objects described by this class desc */
private volatile ClassDataSlot[] dataLayout;
/** serialization-appropriate constructor, or null if none */
private Constructor<?> cons;
/** record canonical constructor (shared among OSCs for same class), or null */
private MethodHandle canonicalCtr;
/** cache of record deserialization constructors per unique set of stream fields
* (shared among OSCs for same class), or null */
private DeserializationConstructorsCache deserializationCtrs;
/** session-cache of record deserialization constructor
* (in de-serialized OSC only), or null */
private MethodHandle deserializationCtr;
/** protection domains that need to be checked when calling the constructor */
private ProtectionDomain[] domains;
/** class-defined writeObject method, or null if none */
private Method writeObjectMethod;
/** class-defined readObject method, or null if none */
private Method readObjectMethod;
/** class-defined readObjectNoData method, or null if none */
private Method readObjectNoDataMethod;
/** class-defined writeReplace method, or null if none */
private Method writeReplaceMethod;
/** class-defined readResolve method, or null if none */
private Method readResolveMethod;
/** local class descriptor for represented class (may point to self) */
private ObjectStreamClass localDesc;
/** superclass descriptor appearing in stream */
private ObjectStreamClass superDesc;
/** true if, and only if, the object has been correctly initialized */
private boolean initialized;
/**
* Initializes native code.
*/
private static native void initNative();
static {
initNative();
}
/**
* Find the descriptor for a class that can be serialized. Creates an
* ObjectStreamClass instance if one does not exist yet for class. Null is
* returned if the specified class does not implement java.io.Serializable
* or java.io.Externalizable.
*
* @param cl class for which to get the descriptor
* @return the class descriptor for the specified class
*/
public static ObjectStreamClass lookup(Class<?> cl) {
return lookup(cl, false);
}
/**
* Returns the descriptor for any class, regardless of whether it
* implements {@link Serializable}.
*
* @param cl class for which to get the descriptor
* @return the class descriptor for the specified class
* @since 1.6
*/
public static ObjectStreamClass lookupAny(Class<?> cl) {
return lookup(cl, true);
}
/**
* Returns the name of the class described by this descriptor.
* This method returns the name of the class in the format that
* is used by the {@link Class#getName} method.
*
* @return a string representing the name of the class
*/
public String getName() {
return name;
}
/**
* Return the serialVersionUID for this class. The serialVersionUID
* defines a set of classes all with the same name that have evolved from a
* common root class and agree to be serialized and deserialized using a
* common format. NonSerializable classes have a serialVersionUID of 0L.
*
* @return the SUID of the class described by this descriptor
*/
@SuppressWarnings("removal")
public long getSerialVersionUID() {
// REMIND: synchronize instead of relying on volatile?
if (suid == null) {
if (isRecord)
return 0L;
suid = AccessController.doPrivileged(
new PrivilegedAction<Long>() {
public Long run() {
return computeDefaultSUID(cl);
}
}
);
}
return suid.longValue();
}
/**
* Return the class in the local VM that this version is mapped to. Null
* is returned if there is no corresponding local class.
*
* @return the {@code Class} instance that this descriptor represents
*/
@SuppressWarnings("removal")
@CallerSensitive
public Class<?> forClass() {
if (cl == null) {
return null;
}
requireInitialized();
if (System.getSecurityManager() != null) {
Class<?> caller = Reflection.getCallerClass();
if (ReflectUtil.needsPackageAccessCheck(caller.getClassLoader(), cl.getClassLoader())) {
ReflectUtil.checkPackageAccess(cl);
}
}
return cl;
}
/**
* Return an array of the fields of this serializable class.
*
* @return an array containing an element for each persistent field of
* this class. Returns an array of length zero if there are no
* fields.
* @since 1.2
*/
public ObjectStreamField[] getFields() {
return getFields(true);
}
/**
* Get the field of this class by name.
*
* @param name the name of the data field to look for
* @return The ObjectStreamField object of the named field or null if
* there is no such named field.
*/
public ObjectStreamField getField(String name) {
return getField(name, null);
}
/**
* Return a string describing this ObjectStreamClass.
*/
public String toString() {
return name + ": static final long serialVersionUID = " +
getSerialVersionUID() + "L;";
}
/**
* Looks up and returns class descriptor for given class, or null if class
* is non-serializable and "all" is set to false.
*
* @param cl class to look up
* @param all if true, return descriptors for all classes; if false, only
* return descriptors for serializable classes
*/
static ObjectStreamClass lookup(Class<?> cl, boolean all) {
if (!(all || Serializable.class.isAssignableFrom(cl))) {
return null;
}
processQueue(Caches.localDescsQueue, Caches.localDescs);
WeakClassKey key = new WeakClassKey(cl, Caches.localDescsQueue);
Reference<?> ref = Caches.localDescs.get(key);
Object entry = null;
if (ref != null) {
entry = ref.get();
}
EntryFuture future = null;
if (entry == null) {
EntryFuture newEntry = new EntryFuture();
Reference<?> newRef = new SoftReference<>(newEntry);
do {
if (ref != null) {
Caches.localDescs.remove(key, ref);
}
ref = Caches.localDescs.putIfAbsent(key, newRef);
if (ref != null) {
entry = ref.get();
}
} while (ref != null && entry == null);
if (entry == null) {
future = newEntry;
}
}
if (entry instanceof ObjectStreamClass) { // check common case first
return (ObjectStreamClass) entry;
}
if (entry instanceof EntryFuture) {
future = (EntryFuture) entry;
if (future.getOwner() == Thread.currentThread()) {
/*
* Handle nested call situation described by 4803747: waiting
* for future value to be set by a lookup() call further up the
* stack will result in deadlock, so calculate and set the
* future value here instead.
*/
entry = null;
} else {
entry = future.get();
}
}
if (entry == null) {
try {
entry = new ObjectStreamClass(cl);
} catch (Throwable th) {
entry = th;
}
if (future.set(entry)) {
Caches.localDescs.put(key, new SoftReference<>(entry));
} else {
// nested lookup call already set future
entry = future.get();
}
}
if (entry instanceof ObjectStreamClass) {
return (ObjectStreamClass) entry;
} else if (entry instanceof RuntimeException) {
throw (RuntimeException) entry;
} else if (entry instanceof Error) {
throw (Error) entry;
} else {
throw new InternalError("unexpected entry: " + entry);
}
}
/**
* Placeholder used in class descriptor and field reflector lookup tables
* for an entry in the process of being initialized. (Internal) callers
* which receive an EntryFuture belonging to another thread as the result
* of a lookup should call the get() method of the EntryFuture; this will
* return the actual entry once it is ready for use and has been set(). To
* conserve objects, EntryFutures synchronize on themselves.
*/
private static class EntryFuture {
private static final Object unset = new Object();
private final Thread owner = Thread.currentThread();
private Object entry = unset;
/**
* Attempts to set the value contained by this EntryFuture. If the
* EntryFuture's value has not been set already, then the value is
* saved, any callers blocked in the get() method are notified, and
* true is returned. If the value has already been set, then no saving
* or notification occurs, and false is returned.
*/
synchronized boolean set(Object entry) {
if (this.entry != unset) {
return false;
}
this.entry = entry;
notifyAll();
return true;
}
/**
* Returns the value contained by this EntryFuture, blocking if
* necessary until a value is set.
*/
@SuppressWarnings("removal")
synchronized Object get() {
boolean interrupted = false;
while (entry == unset) {
try {
wait();
} catch (InterruptedException ex) {
interrupted = true;
}
}
if (interrupted) {
AccessController.doPrivileged(
new PrivilegedAction<>() {
public Void run() {
Thread.currentThread().interrupt();
return null;
}
}
);
}
return entry;
}
/**
* Returns the thread that created this EntryFuture.
*/
Thread getOwner() {
return owner;
}
}
/**
* Creates local class descriptor representing given class.
*/
@SuppressWarnings("removal")
private ObjectStreamClass(final Class<?> cl) {
this.cl = cl;
name = cl.getName();
isProxy = Proxy.isProxyClass(cl);
isEnum = Enum.class.isAssignableFrom(cl);
isRecord = cl.isRecord();
serializable = Serializable.class.isAssignableFrom(cl);
externalizable = Externalizable.class.isAssignableFrom(cl);
Class<?> superCl = cl.getSuperclass();
superDesc = (superCl != null) ? lookup(superCl, false) : null;
localDesc = this;
if (serializable) {
AccessController.doPrivileged(new PrivilegedAction<>() {
public Void run() {
if (isEnum) {
suid = 0L;
fields = NO_FIELDS;
return null;
}
if (cl.isArray()) {
fields = NO_FIELDS;
return null;
}
suid = getDeclaredSUID(cl);
try {
fields = getSerialFields(cl);
computeFieldOffsets();
} catch (InvalidClassException e) {
serializeEx = deserializeEx =
new ExceptionInfo(e.classname, e.getMessage());
fields = NO_FIELDS;
}
if (isRecord) {
canonicalCtr = canonicalRecordCtr(cl);
deserializationCtrs = new DeserializationConstructorsCache();
} else if (externalizable) {
cons = getExternalizableConstructor(cl);
} else {
cons = getSerializableConstructor(cl);
writeObjectMethod = getPrivateMethod(cl, "writeObject",
new Class<?>[] { ObjectOutputStream.class },
Void.TYPE);
readObjectMethod = getPrivateMethod(cl, "readObject",
new Class<?>[] { ObjectInputStream.class },
Void.TYPE);
readObjectNoDataMethod = getPrivateMethod(
cl, "readObjectNoData", null, Void.TYPE);
hasWriteObjectData = (writeObjectMethod != null);
}
domains = getProtectionDomains(cons, cl);
writeReplaceMethod = getInheritableMethod(
cl, "writeReplace", null, Object.class);
readResolveMethod = getInheritableMethod(
cl, "readResolve", null, Object.class);
return null;
}
});
} else {
suid = 0L;
fields = NO_FIELDS;
}
try {
fieldRefl = getReflector(fields, this);
} catch (InvalidClassException ex) {
// field mismatches impossible when matching local fields vs. self
throw new InternalError(ex);
}
if (deserializeEx == null) {
if (isEnum) {
deserializeEx = new ExceptionInfo(name, "enum type");
} else if (cons == null && !isRecord) {
deserializeEx = new ExceptionInfo(name, "no valid constructor");
}
}
if (isRecord && canonicalCtr == null) {
deserializeEx = new ExceptionInfo(name, "record canonical constructor not found");
} else {
for (int i = 0; i < fields.length; i++) {
if (fields[i].getField() == null) {
defaultSerializeEx = new ExceptionInfo(
name, "unmatched serializable field(s) declared");
}
}
}
initialized = true;
}
/**
* Creates blank class descriptor which should be initialized via a
* subsequent call to initProxy(), initNonProxy() or readNonProxy().
*/
ObjectStreamClass() {
}
/**
* Creates a PermissionDomain that grants no permission.
*/
private ProtectionDomain noPermissionsDomain() {
PermissionCollection perms = new Permissions();
perms.setReadOnly();
return new ProtectionDomain(null, perms);
}
/**
* Aggregate the ProtectionDomains of all the classes that separate
* a concrete class {@code cl} from its ancestor's class declaring
* a constructor {@code cons}.
*
* If {@code cl} is defined by the boot loader, or the constructor
* {@code cons} is declared by {@code cl}, or if there is no security
* manager, then this method does nothing and {@code null} is returned.
*
* @param cons A constructor declared by {@code cl} or one of its
* ancestors.
* @param cl A concrete class, which is either the class declaring
* the constructor {@code cons}, or a serializable subclass
* of that class.
* @return An array of ProtectionDomain representing the set of
* ProtectionDomain that separate the concrete class {@code cl}
* from its ancestor's declaring {@code cons}, or {@code null}.
*/
@SuppressWarnings("removal")
private ProtectionDomain[] getProtectionDomains(Constructor<?> cons,
Class<?> cl) {
ProtectionDomain[] domains = null;
if (cons != null && cl.getClassLoader() != null
&& System.getSecurityManager() != null) {
Class<?> cls = cl;
Class<?> fnscl = cons.getDeclaringClass();
Set<ProtectionDomain> pds = null;
while (cls != fnscl) {
ProtectionDomain pd = cls.getProtectionDomain();
if (pd != null) {
if (pds == null) pds = new HashSet<>();
pds.add(pd);
}
cls = cls.getSuperclass();
if (cls == null) {
// that's not supposed to happen
// make a ProtectionDomain with no permission.
// should we throw instead?
if (pds == null) pds = new HashSet<>();
else pds.clear();
pds.add(noPermissionsDomain());
break;
}
}
if (pds != null) {
domains = pds.toArray(new ProtectionDomain[0]);
}
}
return domains;
}
/**
* Initializes class descriptor representing a proxy class.
*/
void initProxy(Class<?> cl,
ClassNotFoundException resolveEx,
ObjectStreamClass superDesc)
throws InvalidClassException
{
ObjectStreamClass osc = null;
if (cl != null) {
osc = lookup(cl, true);
if (!osc.isProxy) {
throw new InvalidClassException(
"cannot bind proxy descriptor to a non-proxy class");
}
}
this.cl = cl;
this.resolveEx = resolveEx;
this.superDesc = superDesc;
isProxy = true;
serializable = true;
suid = 0L;
fields = NO_FIELDS;
if (osc != null) {
localDesc = osc;
name = localDesc.name;
externalizable = localDesc.externalizable;
writeReplaceMethod = localDesc.writeReplaceMethod;
readResolveMethod = localDesc.readResolveMethod;
deserializeEx = localDesc.deserializeEx;
domains = localDesc.domains;
cons = localDesc.cons;
}
fieldRefl = getReflector(fields, localDesc);
initialized = true;
}
/**
* Initializes class descriptor representing a non-proxy class.
*/
void initNonProxy(ObjectStreamClass model,
Class<?> cl,
ClassNotFoundException resolveEx,
ObjectStreamClass superDesc)
throws InvalidClassException
{
long suid = model.getSerialVersionUID();
ObjectStreamClass osc = null;
if (cl != null) {
osc = lookup(cl, true);
if (osc.isProxy) {
throw new InvalidClassException(
"cannot bind non-proxy descriptor to a proxy class");
}
if (model.isEnum != osc.isEnum) {
throw new InvalidClassException(model.isEnum ?
"cannot bind enum descriptor to a non-enum class" :
"cannot bind non-enum descriptor to an enum class");
}
if (model.serializable == osc.serializable &&
!cl.isArray() && !cl.isRecord() &&
suid != osc.getSerialVersionUID()) {
throw new InvalidClassException(osc.name,
"local class incompatible: " +
"stream classdesc serialVersionUID = " + suid +
", local class serialVersionUID = " +
osc.getSerialVersionUID());
}
if (!classNamesEqual(model.name, osc.name)) {
throw new InvalidClassException(osc.name,
"local class name incompatible with stream class " +
"name \"" + model.name + "\"");
}
if (!model.isEnum) {
if ((model.serializable == osc.serializable) &&
(model.externalizable != osc.externalizable)) {
throw new InvalidClassException(osc.name,
"Serializable incompatible with Externalizable");
}
if ((model.serializable != osc.serializable) ||
(model.externalizable != osc.externalizable) ||
!(model.serializable || model.externalizable)) {
deserializeEx = new ExceptionInfo(
osc.name, "class invalid for deserialization");
}
}
}
this.cl = cl;
this.resolveEx = resolveEx;
this.superDesc = superDesc;
name = model.name;
this.suid = suid;
isProxy = false;
isEnum = model.isEnum;
serializable = model.serializable;
externalizable = model.externalizable;
hasBlockExternalData = model.hasBlockExternalData;
hasWriteObjectData = model.hasWriteObjectData;
fields = model.fields;
primDataSize = model.primDataSize;
numObjFields = model.numObjFields;
if (osc != null) {
localDesc = osc;
isRecord = localDesc.isRecord;
// canonical record constructor is shared
canonicalCtr = localDesc.canonicalCtr;
// cache of deserialization constructors is shared
deserializationCtrs = localDesc.deserializationCtrs;
writeObjectMethod = localDesc.writeObjectMethod;
readObjectMethod = localDesc.readObjectMethod;
readObjectNoDataMethod = localDesc.readObjectNoDataMethod;
writeReplaceMethod = localDesc.writeReplaceMethod;
readResolveMethod = localDesc.readResolveMethod;
if (deserializeEx == null) {
deserializeEx = localDesc.deserializeEx;
}
domains = localDesc.domains;
assert cl.isRecord() ? localDesc.cons == null : true;
cons = localDesc.cons;
}
fieldRefl = getReflector(fields, localDesc);
// reassign to matched fields so as to reflect local unshared settings
fields = fieldRefl.getFields();
initialized = true;
}
/**
* Reads non-proxy class descriptor information from given input stream.
* The resulting class descriptor is not fully functional; it can only be
* used as input to the ObjectInputStream.resolveClass() and
* ObjectStreamClass.initNonProxy() methods.
*/
void readNonProxy(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
name = in.readUTF();
suid = in.readLong();
isProxy = false;
byte flags = in.readByte();
hasWriteObjectData =
((flags & ObjectStreamConstants.SC_WRITE_METHOD) != 0);
hasBlockExternalData =
((flags & ObjectStreamConstants.SC_BLOCK_DATA) != 0);
externalizable =
((flags & ObjectStreamConstants.SC_EXTERNALIZABLE) != 0);
boolean sflag =
((flags & ObjectStreamConstants.SC_SERIALIZABLE) != 0);
if (externalizable && sflag) {
throw new InvalidClassException(
name, "serializable and externalizable flags conflict");
}
serializable = externalizable || sflag;
isEnum = ((flags & ObjectStreamConstants.SC_ENUM) != 0);
if (isEnum && suid.longValue() != 0L) {
throw new InvalidClassException(name,
"enum descriptor has non-zero serialVersionUID: " + suid);
}
int numFields = in.readShort();
if (isEnum && numFields != 0) {
throw new InvalidClassException(name,
"enum descriptor has non-zero field count: " + numFields);
}
fields = (numFields > 0) ?
new ObjectStreamField[numFields] : NO_FIELDS;
for (int i = 0; i < numFields; i++) {
char tcode = (char) in.readByte();
String fname = in.readUTF();
String signature = ((tcode == 'L') || (tcode == '[')) ?
in.readTypeString() : String.valueOf(tcode);
try {
fields[i] = new ObjectStreamField(fname, signature, false);
} catch (RuntimeException e) {
throw (IOException) new InvalidClassException(name,
"invalid descriptor for field " + fname).initCause(e);
}
}
computeFieldOffsets();
}
/**
* Writes non-proxy class descriptor information to given output stream.
*/
void writeNonProxy(ObjectOutputStream out) throws IOException {
out.writeUTF(name);
out.writeLong(getSerialVersionUID());
byte flags = 0;
if (externalizable) {
flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
int protocol = out.getProtocolVersion();
if (protocol != ObjectStreamConstants.PROTOCOL_VERSION_1) {
flags |= ObjectStreamConstants.SC_BLOCK_DATA;
}
} else if (serializable) {
flags |= ObjectStreamConstants.SC_SERIALIZABLE;
}
if (hasWriteObjectData) {
flags |= ObjectStreamConstants.SC_WRITE_METHOD;
}
if (isEnum) {
flags |= ObjectStreamConstants.SC_ENUM;
}
out.writeByte(flags);
out.writeShort(fields.length);
for (int i = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i];
out.writeByte(f.getTypeCode());
out.writeUTF(f.getName());
if (!f.isPrimitive()) {
out.writeTypeString(f.getTypeString());
}
}
}
/**
* Returns ClassNotFoundException (if any) thrown while attempting to
* resolve local class corresponding to this class descriptor.
*/
ClassNotFoundException getResolveException() {
return resolveEx;
}
/**
* Throws InternalError if not initialized.
*/
private final void requireInitialized() {
if (!initialized)
throw new InternalError("Unexpected call when not initialized");
}
/**
* Throws InvalidClassException if not initialized.
* To be called in cases where an uninitialized class descriptor indicates
* a problem in the serialization stream.
*/
final void checkInitialized() throws InvalidClassException {
if (!initialized) {
throw new InvalidClassException("Class descriptor should be initialized");
}
}
/**
* Throws an InvalidClassException if object instances referencing this
* class descriptor should not be allowed to deserialize. This method does
* not apply to deserialization of enum constants.
*/
void checkDeserialize() throws InvalidClassException {
requireInitialized();
if (deserializeEx != null) {
throw deserializeEx.newInvalidClassException();
}
}
/**
* Throws an InvalidClassException if objects whose class is represented by
* this descriptor should not be allowed to serialize. This method does
* not apply to serialization of enum constants.
*/
void checkSerialize() throws InvalidClassException {
requireInitialized();
if (serializeEx != null) {
throw serializeEx.newInvalidClassException();
}
}
/**
* Throws an InvalidClassException if objects whose class is represented by
* this descriptor should not be permitted to use default serialization
* (e.g., if the class declares serializable fields that do not correspond
* to actual fields, and hence must use the GetField API). This method
* does not apply to deserialization of enum constants.
*/
void checkDefaultSerialize() throws InvalidClassException {
requireInitialized();
if (defaultSerializeEx != null) {
throw defaultSerializeEx.newInvalidClassException();
}
}
/**
* Returns superclass descriptor. Note that on the receiving side, the
* superclass descriptor may be bound to a class that is not a superclass
* of the subclass descriptor's bound class.
*/
ObjectStreamClass getSuperDesc() {
requireInitialized();
return superDesc;
}
/**
* Returns the "local" class descriptor for the class associated with this
* class descriptor (i.e., the result of
* ObjectStreamClass.lookup(this.forClass())) or null if there is no class
* associated with this descriptor.
*/
ObjectStreamClass getLocalDesc() {
requireInitialized();
return localDesc;
}
/**
* Returns arrays of ObjectStreamFields representing the serializable
* fields of the represented class. If copy is true, a clone of this class
* descriptor's field array is returned, otherwise the array itself is
* returned.
*/
ObjectStreamField[] getFields(boolean copy) {
return copy ? fields.clone() : fields;
}
/**
* Looks up a serializable field of the represented class by name and type.
* A specified type of null matches all types, Object.class matches all
* non-primitive types, and any other non-null type matches assignable
* types only. Returns matching field, or null if no match found.
*/
ObjectStreamField getField(String name, Class<?> type) {
for (int i = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i];
if (f.getName().equals(name)) {
if (type == null ||
(type == Object.class && !f.isPrimitive()))
{
return f;
}
Class<?> ftype = f.getType();
if (ftype != null && type.isAssignableFrom(ftype)) {
return f;
}
}
}
return null;
}
/**
* Returns true if class descriptor represents a dynamic proxy class, false
* otherwise.
*/
boolean isProxy() {
requireInitialized();
return isProxy;
}
/**
* Returns true if class descriptor represents an enum type, false
* otherwise.
*/
boolean isEnum() {
requireInitialized();
return isEnum;
}
/**
* Returns true if class descriptor represents a record type, false
* otherwise.
*/
boolean isRecord() {
requireInitialized();
return isRecord;
}
/**
* Returns true if represented class implements Externalizable, false
* otherwise.
*/
boolean isExternalizable() {
requireInitialized();
return externalizable;
}
/**
* Returns true if represented class implements Serializable, false
* otherwise.
*/
boolean isSerializable() {
requireInitialized();
return serializable;
}
/**
* Returns true if class descriptor represents externalizable class that
* has written its data in 1.2 (block data) format, false otherwise.
*/
boolean hasBlockExternalData() {
requireInitialized();
return hasBlockExternalData;
}
/**
* Returns true if class descriptor represents serializable (but not
* externalizable) class which has written its data via a custom
* writeObject() method, false otherwise.
*/
boolean hasWriteObjectData() {
requireInitialized();
return hasWriteObjectData;
}
/**
* Returns true if represented class is serializable/externalizable and can
* be instantiated by the serialization runtime--i.e., if it is
* externalizable and defines a public no-arg constructor, or if it is
* non-externalizable and its first non-serializable superclass defines an
* accessible no-arg constructor. Otherwise, returns false.
*/
boolean isInstantiable() {
requireInitialized();
return (cons != null);
}
/**
* Returns true if represented class is serializable (but not
* externalizable) and defines a conformant writeObject method. Otherwise,
* returns false.
*/
boolean hasWriteObjectMethod() {
requireInitialized();
return (writeObjectMethod != null);
}
/**
* Returns true if represented class is serializable (but not
* externalizable) and defines a conformant readObject method. Otherwise,
* returns false.
*/
boolean hasReadObjectMethod() {
requireInitialized();
return (readObjectMethod != null);
}
/**
* Returns true if represented class is serializable (but not
* externalizable) and defines a conformant readObjectNoData method.
* Otherwise, returns false.
*/
boolean hasReadObjectNoDataMethod() {
requireInitialized();
return (readObjectNoDataMethod != null);
}
/**
* Returns true if represented class is serializable or externalizable and
* defines a conformant writeReplace method. Otherwise, returns false.
*/
boolean hasWriteReplaceMethod() {
requireInitialized();
return (writeReplaceMethod != null);
}
/**
* Returns true if represented class is serializable or externalizable and
* defines a conformant readResolve method. Otherwise, returns false.
*/
boolean hasReadResolveMethod() {
requireInitialized();
return (readResolveMethod != null);
}
/**
* Creates a new instance of the represented class. If the class is
* externalizable, invokes its public no-arg constructor; otherwise, if the
* class is serializable, invokes the no-arg constructor of the first
* non-serializable superclass. Throws UnsupportedOperationException if
* this class descriptor is not associated with a class, if the associated
* class is non-serializable or if the appropriate no-arg constructor is
* inaccessible/unavailable.
*/
@SuppressWarnings("removal")
Object newInstance()
throws InstantiationException, InvocationTargetException,
UnsupportedOperationException
{
requireInitialized();
if (cons != null) {
try {
if (domains == null || domains.length == 0) {
return cons.newInstance();
} else {
JavaSecurityAccess jsa = SharedSecrets.getJavaSecurityAccess();
PrivilegedAction<?> pea = () -> {
try {
return cons.newInstance();
} catch (InstantiationException
| InvocationTargetException
| IllegalAccessException x) {
throw new UndeclaredThrowableException(x);
}
}; // Can't use PrivilegedExceptionAction with jsa
try {
return jsa.doIntersectionPrivilege(pea,
AccessController.getContext(),
new AccessControlContext(domains));
} catch (UndeclaredThrowableException x) {
Throwable cause = x.getCause();
if (cause instanceof InstantiationException)
throw (InstantiationException) cause;
if (cause instanceof InvocationTargetException)
throw (InvocationTargetException) cause;
if (cause instanceof IllegalAccessException)
throw (IllegalAccessException) cause;
// not supposed to happen
throw x;
}
}
} catch (IllegalAccessException ex) {
// should not occur, as access checks have been suppressed
throw new InternalError(ex);
} catch (InstantiationError err) {
var ex = new InstantiationException();
ex.initCause(err);
throw ex;
}
} else {
throw new UnsupportedOperationException();
}
}
/**
* Invokes the writeObject method of the represented serializable class.
* Throws UnsupportedOperationException if this class descriptor is not
* associated with a class, or if the class is externalizable,
* non-serializable or does not define writeObject.
*/
void invokeWriteObject(Object obj, ObjectOutputStream out)
throws IOException, UnsupportedOperationException
{
requireInitialized();
if (writeObjectMethod != null) {
try {
writeObjectMethod.invoke(obj, new Object[]{ out });
} catch (InvocationTargetException ex) {
Throwable th = ex.getCause();
if (th instanceof IOException) {
throw (IOException) th;
} else {
throwMiscException(th);
}
} catch (IllegalAccessException ex) {
// should not occur, as access checks have been suppressed
throw new InternalError(ex);
}
} else {
throw new UnsupportedOperationException();
}
}
/**
* Invokes the readObject method of the represented serializable class.
* Throws UnsupportedOperationException if this class descriptor is not
* associated with a class, or if the class is externalizable,
* non-serializable or does not define readObject.
*/
void invokeReadObject(Object obj, ObjectInputStream in)
throws ClassNotFoundException, IOException,
UnsupportedOperationException
{
requireInitialized();
if (readObjectMethod != null) {
try {
readObjectMethod.invoke(obj, new Object[]{ in });
} catch (InvocationTargetException ex) {
Throwable th = ex.getCause();
if (th instanceof ClassNotFoundException) {
throw (ClassNotFoundException) th;
} else if (th instanceof IOException) {
throw (IOException) th;
} else {
throwMiscException(th);
}
} catch (IllegalAccessException ex) {
// should not occur, as access checks have been suppressed
throw new InternalError(ex);
}
} else {
throw new UnsupportedOperationException();
}
}
/**
* Invokes the readObjectNoData method of the represented serializable
* class. Throws UnsupportedOperationException if this class descriptor is
* not associated with a class, or if the class is externalizable,
* non-serializable or does not define readObjectNoData.
*/
void invokeReadObjectNoData(Object obj)
throws IOException, UnsupportedOperationException
{
requireInitialized();
if (readObjectNoDataMethod != null) {
try {
readObjectNoDataMethod.invoke(obj, (Object[]) null);
} catch (InvocationTargetException ex) {
Throwable th = ex.getCause();
if (th instanceof ObjectStreamException) {
throw (ObjectStreamException) th;
} else {
throwMiscException(th);
}
} catch (IllegalAccessException ex) {
// should not occur, as access checks have been suppressed
throw new InternalError(ex);
}
} else {
throw new UnsupportedOperationException();
}
}
/**
* Invokes the writeReplace method of the represented serializable class and
* returns the result. Throws UnsupportedOperationException if this class
* descriptor is not associated with a class, or if the class is
* non-serializable or does not define writeReplace.
*/
Object invokeWriteReplace(Object obj)
throws IOException, UnsupportedOperationException
{
requireInitialized();
if (writeReplaceMethod != null) {
try {
return writeReplaceMethod.invoke(obj, (Object[]) null);
} catch (InvocationTargetException ex) {
Throwable th = ex.getCause();
if (th instanceof ObjectStreamException) {
throw (ObjectStreamException) th;
} else {
throwMiscException(th);
throw new InternalError(th); // never reached
}
} catch (IllegalAccessException ex) {
// should not occur, as access checks have been suppressed
throw new InternalError(ex);
}
} else {
throw new UnsupportedOperationException();
}
}
/**
* Invokes the readResolve method of the represented serializable class and
* returns the result. Throws UnsupportedOperationException if this class
* descriptor is not associated with a class, or if the class is
* non-serializable or does not define readResolve.
*/
Object invokeReadResolve(Object obj)
throws IOException, UnsupportedOperationException
{
requireInitialized();
if (readResolveMethod != null) {
try {
return readResolveMethod.invoke(obj, (Object[]) null);
} catch (InvocationTargetException ex) {
Throwable th = ex.getCause();
if (th instanceof ObjectStreamException) {
throw (ObjectStreamException) th;
} else {
throwMiscException(th);
throw new InternalError(th); // never reached
}
} catch (IllegalAccessException ex) {
// should not occur, as access checks have been suppressed
throw new InternalError(ex);
}
} else {
throw new UnsupportedOperationException();
}
}
/**
* Class representing the portion of an object's serialized form allotted
* to data described by a given class descriptor. If "hasData" is false,
* the object's serialized form does not contain data associated with the
* class descriptor.
*/
static class ClassDataSlot {
/** class descriptor "occupying" this slot */
final ObjectStreamClass desc;
/** true if serialized form includes data for this slot's descriptor */
final boolean hasData;
ClassDataSlot(ObjectStreamClass desc, boolean hasData) {
this.desc = desc;
this.hasData = hasData;
}
}
/**
* Returns array of ClassDataSlot instances representing the data layout
* (including superclass data) for serialized objects described by this
* class descriptor. ClassDataSlots are ordered by inheritance with those
* containing "higher" superclasses appearing first. The final
* ClassDataSlot contains a reference to this descriptor.
*/
ClassDataSlot[] getClassDataLayout() throws InvalidClassException {
// REMIND: synchronize instead of relying on volatile?
if (dataLayout == null) {
dataLayout = getClassDataLayout0();
}
return dataLayout;
}
private ClassDataSlot[] getClassDataLayout0()
throws InvalidClassException
{
ArrayList<ClassDataSlot> slots = new ArrayList<>();
Class<?> start = cl, end = cl;
// locate closest non-serializable superclass
while (end != null && Serializable.class.isAssignableFrom(end)) {
end = end.getSuperclass();
}
HashSet<String> oscNames = new HashSet<>(3);
for (ObjectStreamClass d = this; d != null; d = d.superDesc) {
if (oscNames.contains(d.name)) {
throw new InvalidClassException("Circular reference.");
} else {
oscNames.add(d.name);
}
// search up inheritance hierarchy for class with matching name
String searchName = (d.cl != null) ? d.cl.getName() : d.name;
Class<?> match = null;
for (Class<?> c = start; c != end; c = c.getSuperclass()) {
if (searchName.equals(c.getName())) {
match = c;
break;
}
}
// add "no data" slot for each unmatched class below match
if (match != null) {
for (Class<?> c = start; c != match; c = c.getSuperclass()) {
slots.add(new ClassDataSlot(
ObjectStreamClass.lookup(c, true), false));
}
start = match.getSuperclass();
}
// record descriptor/class pairing
slots.add(new ClassDataSlot(d.getVariantFor(match), true));
}
// add "no data" slot for any leftover unmatched classes
for (Class<?> c = start; c != end; c = c.getSuperclass()) {
slots.add(new ClassDataSlot(
ObjectStreamClass.lookup(c, true), false));
}
// order slots from superclass -> subclass
Collections.reverse(slots);
return slots.toArray(new ClassDataSlot[slots.size()]);
}
/**
* Returns aggregate size (in bytes) of marshalled primitive field values
* for represented class.
*/
int getPrimDataSize() {
return primDataSize;
}
/**
* Returns number of non-primitive serializable fields of represented
* class.
*/
int getNumObjFields() {
return numObjFields;
}
/**
* Fetches the serializable primitive field values of object obj and
* marshals them into byte array buf starting at offset 0. It is the
* responsibility of the caller to ensure that obj is of the proper type if
* non-null.
*/
void getPrimFieldValues(Object obj, byte[] buf) {
fieldRefl.getPrimFieldValues(obj, buf);
}
/**
* Sets the serializable primitive fields of object obj using values
* unmarshalled from byte array buf starting at offset 0. It is the
* responsibility of the caller to ensure that obj is of the proper type if
* non-null.
*/
void setPrimFieldValues(Object obj, byte[] buf) {
fieldRefl.setPrimFieldValues(obj, buf);
}
/**
* Fetches the serializable object field values of object obj and stores
* them in array vals starting at offset 0. It is the responsibility of
* the caller to ensure that obj is of the proper type if non-null.
*/
void getObjFieldValues(Object obj, Object[] vals) {
fieldRefl.getObjFieldValues(obj, vals);
}
/**
* Checks that the given values, from array vals starting at offset 0,
* are assignable to the given serializable object fields.
* @throws ClassCastException if any value is not assignable
*/
void checkObjFieldValueTypes(Object obj, Object[] vals) {
fieldRefl.checkObjectFieldValueTypes(obj, vals);
}
/**
* Sets the serializable object fields of object obj using values from
* array vals starting at offset 0. It is the responsibility of the caller
* to ensure that obj is of the proper type if non-null.
*/
void setObjFieldValues(Object obj, Object[] vals) {
fieldRefl.setObjFieldValues(obj, vals);
}
/**
* Calculates and sets serializable field offsets, as well as primitive
* data size and object field count totals. Throws InvalidClassException
* if fields are illegally ordered.
*/
private void computeFieldOffsets() throws InvalidClassException {
primDataSize = 0;
numObjFields = 0;
int firstObjIndex = -1;
for (int i = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i];
switch (f.getTypeCode()) {
case 'Z', 'B' -> f.setOffset(primDataSize++);
case 'C', 'S' -> {
f.setOffset(primDataSize);
primDataSize += 2;
}
case 'I', 'F' -> {
f.setOffset(primDataSize);
primDataSize += 4;
}
case 'J', 'D' -> {
f.setOffset(primDataSize);
primDataSize += 8;
}
case '[', 'L' -> {
f.setOffset(numObjFields++);
if (firstObjIndex == -1) {
firstObjIndex = i;
}
}
default -> throw new InternalError();
}
}
if (firstObjIndex != -1 &&
firstObjIndex + numObjFields != fields.length)
{
throw new InvalidClassException(name, "illegal field order");
}
}
/**
* If given class is the same as the class associated with this class
* descriptor, returns reference to this class descriptor. Otherwise,
* returns variant of this class descriptor bound to given class.
*/
private ObjectStreamClass getVariantFor(Class<?> cl)
throws InvalidClassException
{
if (this.cl == cl) {
return this;
}
ObjectStreamClass desc = new ObjectStreamClass();
if (isProxy) {
desc.initProxy(cl, null, superDesc);
} else {
desc.initNonProxy(this, cl, null, superDesc);
}
return desc;
}
/**
* Returns public no-arg constructor of given class, or null if none found.
* Access checks are disabled on the returned constructor (if any), since
* the defining class may still be non-public.
*/
private static Constructor<?> getExternalizableConstructor(Class<?> cl) {
try {
Constructor<?> cons = cl.getDeclaredConstructor((Class<?>[]) null);
cons.setAccessible(true);
return ((cons.getModifiers() & Modifier.PUBLIC) != 0) ?
cons : null;
} catch (NoSuchMethodException ex) {
return null;
}
}
/**
* Returns subclass-accessible no-arg constructor of first non-serializable
* superclass, or null if none found. Access checks are disabled on the
* returned constructor (if any).
*/
private static Constructor<?> getSerializableConstructor(Class<?> cl) {
return reflFactory.newConstructorForSerialization(cl);
}
/**
* Returns the canonical constructor for the given record class, or null if
* the not found ( which should never happen for correctly generated record
* classes ).
*/
@SuppressWarnings("removal")
private static MethodHandle canonicalRecordCtr(Class<?> cls) {
assert cls.isRecord() : "Expected record, got: " + cls;
PrivilegedAction<MethodHandle> pa = () -> {
Class<?>[] paramTypes = Arrays.stream(cls.getRecordComponents())
.map(RecordComponent::getType)
.toArray(Class<?>[]::new);
try {
Constructor<?> ctr = cls.getDeclaredConstructor(paramTypes);
ctr.setAccessible(true);
return MethodHandles.lookup().unreflectConstructor(ctr);
} catch (IllegalAccessException | NoSuchMethodException e) {
return null;
}
};
return AccessController.doPrivileged(pa);
}
/**
* Returns the canonical constructor, if the local class equivalent of this
* stream class descriptor is a record class, otherwise null.
*/
MethodHandle getRecordConstructor() {
return canonicalCtr;
}
/**
* Returns non-static, non-abstract method with given signature provided it
* is defined by or accessible (via inheritance) by the given class, or
* null if no match found. Access checks are disabled on the returned
* method (if any).
*/
private static Method getInheritableMethod(Class<?> cl, String name,
Class<?>[] argTypes,
Class<?> returnType)
{
Method meth = null;
Class<?> defCl = cl;
while (defCl != null) {
try {
meth = defCl.getDeclaredMethod(name, argTypes);
break;
} catch (NoSuchMethodException ex) {
defCl = defCl.getSuperclass();
}
}
if ((meth == null) || (meth.getReturnType() != returnType)) {
return null;
}
meth.setAccessible(true);
int mods = meth.getModifiers();
if ((mods & (Modifier.STATIC | Modifier.ABSTRACT)) != 0) {
return null;
} else if ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) != 0) {
return meth;
} else if ((mods & Modifier.PRIVATE) != 0) {
return (cl == defCl) ? meth : null;
} else {
return packageEquals(cl, defCl) ? meth : null;
}
}
/**
* Returns non-static private method with given signature defined by given
* class, or null if none found. Access checks are disabled on the
* returned method (if any).
*/
private static Method getPrivateMethod(Class<?> cl, String name,
Class<?>[] argTypes,
Class<?> returnType)
{
try {
Method meth = cl.getDeclaredMethod(name, argTypes);
meth.setAccessible(true);
int mods = meth.getModifiers();
return ((meth.getReturnType() == returnType) &&
((mods & Modifier.STATIC) == 0) &&
((mods & Modifier.PRIVATE) != 0)) ? meth : null;
} catch (NoSuchMethodException ex) {
return null;
}
}
/**
* Returns true if classes are defined in the same runtime package, false
* otherwise.
*/
private static boolean packageEquals(Class<?> cl1, Class<?> cl2) {
return cl1.getClassLoader() == cl2.getClassLoader() &&
cl1.getPackageName() == cl2.getPackageName();
}
/**
* Compares class names for equality, ignoring package names. Returns true
* if class names equal, false otherwise.
*/
private static boolean classNamesEqual(String name1, String name2) {
int idx1 = name1.lastIndexOf('.') + 1;
int idx2 = name2.lastIndexOf('.') + 1;
int len1 = name1.length() - idx1;
int len2 = name2.length() - idx2;
return len1 == len2 &&
name1.regionMatches(idx1, name2, idx2, len1);
}
/**
* Returns JVM type signature for given list of parameters and return type.
*/
private static String getMethodSignature(Class<?>[] paramTypes,
Class<?> retType)
{
StringBuilder sb = new StringBuilder();
sb.append('(');
for (int i = 0; i < paramTypes.length; i++) {
appendClassSignature(sb, paramTypes[i]);
}
sb.append(')');
appendClassSignature(sb, retType);
return sb.toString();
}
/**
* Convenience method for throwing an exception that is either a
* RuntimeException, Error, or of some unexpected type (in which case it is
* wrapped inside an IOException).
*/
private static void throwMiscException(Throwable th) throws IOException {
if (th instanceof RuntimeException) {
throw (RuntimeException) th;
} else if (th instanceof Error) {
throw (Error) th;
} else {
IOException ex = new IOException("unexpected exception type");
ex.initCause(th);
throw ex;
}
}
/**
* Returns ObjectStreamField array describing the serializable fields of
* the given class. Serializable fields backed by an actual field of the
* class are represented by ObjectStreamFields with corresponding non-null
* Field objects. Throws InvalidClassException if the (explicitly
* declared) serializable fields are invalid.
*/
private static ObjectStreamField[] getSerialFields(Class<?> cl)
throws InvalidClassException
{
if (!Serializable.class.isAssignableFrom(cl))
return NO_FIELDS;
ObjectStreamField[] fields;
if (cl.isRecord()) {
fields = getDefaultSerialFields(cl);
Arrays.sort(fields);
} else if (!Externalizable.class.isAssignableFrom(cl) &&
!Proxy.isProxyClass(cl) &&
!cl.isInterface()) {
if ((fields = getDeclaredSerialFields(cl)) == null) {
fields = getDefaultSerialFields(cl);
}
Arrays.sort(fields);
} else {
fields = NO_FIELDS;
}
return fields;
}
/**
* Returns serializable fields of given class as defined explicitly by a
* "serialPersistentFields" field, or null if no appropriate
* "serialPersistentFields" field is defined. Serializable fields backed
* by an actual field of the class are represented by ObjectStreamFields
* with corresponding non-null Field objects. For compatibility with past
* releases, a "serialPersistentFields" field with a null value is
* considered equivalent to not declaring "serialPersistentFields". Throws
* InvalidClassException if the declared serializable fields are
* invalid--e.g., if multiple fields share the same name.
*/
private static ObjectStreamField[] getDeclaredSerialFields(Class<?> cl)
throws InvalidClassException
{
ObjectStreamField[] serialPersistentFields = null;
try {
Field f = cl.getDeclaredField("serialPersistentFields");
int mask = Modifier.PRIVATE | Modifier.STATIC | Modifier.FINAL;
if ((f.getModifiers() & mask) == mask) {
f.setAccessible(true);
serialPersistentFields = (ObjectStreamField[]) f.get(null);
}
} catch (Exception ex) {
}
if (serialPersistentFields == null) {
return null;
} else if (serialPersistentFields.length == 0) {
return NO_FIELDS;
}
ObjectStreamField[] boundFields =
new ObjectStreamField[serialPersistentFields.length];
Set<String> fieldNames = new HashSet<>(serialPersistentFields.length);
for (int i = 0; i < serialPersistentFields.length; i++) {
ObjectStreamField spf = serialPersistentFields[i];
String fname = spf.getName();
if (fieldNames.contains(fname)) {
throw new InvalidClassException(
"multiple serializable fields named " + fname);
}
fieldNames.add(fname);
try {
Field f = cl.getDeclaredField(fname);
if ((f.getType() == spf.getType()) &&
((f.getModifiers() & Modifier.STATIC) == 0))
{
boundFields[i] =
new ObjectStreamField(f, spf.isUnshared(), true);
}
} catch (NoSuchFieldException ex) {
}
if (boundFields[i] == null) {
boundFields[i] = new ObjectStreamField(
fname, spf.getType(), spf.isUnshared());
}
}
return boundFields;
}
/**
* Returns array of ObjectStreamFields corresponding to all non-static
* non-transient fields declared by given class. Each ObjectStreamField
* contains a Field object for the field it represents. If no default
* serializable fields exist, NO_FIELDS is returned.
*/
private static ObjectStreamField[] getDefaultSerialFields(Class<?> cl) {
Field[] clFields = cl.getDeclaredFields();
ArrayList<ObjectStreamField> list = new ArrayList<>();
int mask = Modifier.STATIC | Modifier.TRANSIENT;
for (int i = 0; i < clFields.length; i++) {
if ((clFields[i].getModifiers() & mask) == 0) {
list.add(new ObjectStreamField(clFields[i], false, true));
}
}
int size = list.size();
return (size == 0) ? NO_FIELDS :
list.toArray(new ObjectStreamField[size]);
}
/**
* Returns explicit serial version UID value declared by given class, or
* null if none.
*/
private static Long getDeclaredSUID(Class<?> cl) {
try {
Field f = cl.getDeclaredField("serialVersionUID");
int mask = Modifier.STATIC | Modifier.FINAL;
if ((f.getModifiers() & mask) == mask) {
f.setAccessible(true);
return f.getLong(null);
}
} catch (Exception ex) {
}
return null;
}
/**
* Computes the default serial version UID value for the given class.
*/
private static long computeDefaultSUID(Class<?> cl) {
if (!Serializable.class.isAssignableFrom(cl) || Proxy.isProxyClass(cl))
{
return 0L;
}
try {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dout = new DataOutputStream(bout);
dout.writeUTF(cl.getName());
int classMods = cl.getModifiers() &
(Modifier.PUBLIC | Modifier.FINAL |
Modifier.INTERFACE | Modifier.ABSTRACT);
/*
* compensate for javac bug in which ABSTRACT bit was set for an
* interface only if the interface declared methods
*/
Method[] methods = cl.getDeclaredMethods();
if ((classMods & Modifier.INTERFACE) != 0) {
classMods = (methods.length > 0) ?
(classMods | Modifier.ABSTRACT) :
(classMods & ~Modifier.ABSTRACT);
}
dout.writeInt(classMods);
if (!cl.isArray()) {
/*
* compensate for change in 1.2FCS in which
* Class.getInterfaces() was modified to return Cloneable and
* Serializable for array classes.
*/
Class<?>[] interfaces = cl.getInterfaces();
String[] ifaceNames = new String[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
ifaceNames[i] = interfaces[i].getName();
}
Arrays.sort(ifaceNames);
for (int i = 0; i < ifaceNames.length; i++) {
dout.writeUTF(ifaceNames[i]);
}
}
Field[] fields = cl.getDeclaredFields();
MemberSignature[] fieldSigs = new MemberSignature[fields.length];
for (int i = 0; i < fields.length; i++) {
fieldSigs[i] = new MemberSignature(fields[i]);
}
Arrays.sort(fieldSigs, new Comparator<>() {
public int compare(MemberSignature ms1, MemberSignature ms2) {
return ms1.name.compareTo(ms2.name);
}
});
for (int i = 0; i < fieldSigs.length; i++) {
MemberSignature sig = fieldSigs[i];
int mods = sig.member.getModifiers() &
(Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
Modifier.STATIC | Modifier.FINAL | Modifier.VOLATILE |
Modifier.TRANSIENT);
if (((mods & Modifier.PRIVATE) == 0) ||
((mods & (Modifier.STATIC | Modifier.TRANSIENT)) == 0))
{
dout.writeUTF(sig.name);
dout.writeInt(mods);
dout.writeUTF(sig.signature);
}
}
if (hasStaticInitializer(cl)) {
dout.writeUTF("<clinit>");
dout.writeInt(Modifier.STATIC);
dout.writeUTF("()V");
}
Constructor<?>[] cons = cl.getDeclaredConstructors();
MemberSignature[] consSigs = new MemberSignature[cons.length];
for (int i = 0; i < cons.length; i++) {
consSigs[i] = new MemberSignature(cons[i]);
}
Arrays.sort(consSigs, new Comparator<>() {
public int compare(MemberSignature ms1, MemberSignature ms2) {
return ms1.signature.compareTo(ms2.signature);
}
});
for (int i = 0; i < consSigs.length; i++) {
MemberSignature sig = consSigs[i];
int mods = sig.member.getModifiers() &
(Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
Modifier.STATIC | Modifier.FINAL |
Modifier.SYNCHRONIZED | Modifier.NATIVE |
Modifier.ABSTRACT | Modifier.STRICT);
if ((mods & Modifier.PRIVATE) == 0) {
dout.writeUTF("<init>");
dout.writeInt(mods);
dout.writeUTF(sig.signature.replace('/', '.'));
}
}
MemberSignature[] methSigs = new MemberSignature[methods.length];
for (int i = 0; i < methods.length; i++) {
methSigs[i] = new MemberSignature(methods[i]);
}
Arrays.sort(methSigs, new Comparator<>() {
public int compare(MemberSignature ms1, MemberSignature ms2) {
int comp = ms1.name.compareTo(ms2.name);
if (comp == 0) {
comp = ms1.signature.compareTo(ms2.signature);
}
return comp;
}
});
for (int i = 0; i < methSigs.length; i++) {
MemberSignature sig = methSigs[i];
int mods = sig.member.getModifiers() &
(Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
Modifier.STATIC | Modifier.FINAL |
Modifier.SYNCHRONIZED | Modifier.NATIVE |
Modifier.ABSTRACT | Modifier.STRICT);
if ((mods & Modifier.PRIVATE) == 0) {
dout.writeUTF(sig.name);
dout.writeInt(mods);
dout.writeUTF(sig.signature.replace('/', '.'));
}
}
dout.flush();
MessageDigest md = MessageDigest.getInstance("SHA");
byte[] hashBytes = md.digest(bout.toByteArray());
long hash = 0;
for (int i = Math.min(hashBytes.length, 8) - 1; i >= 0; i--) {
hash = (hash << 8) | (hashBytes[i] & 0xFF);
}
return hash;
} catch (IOException ex) {
throw new InternalError(ex);
} catch (NoSuchAlgorithmException ex) {
throw new SecurityException(ex.getMessage());
}
}
/**
* Returns true if the given class defines a static initializer method,
* false otherwise.
*/
private static native boolean hasStaticInitializer(Class<?> cl);
/**
* Class for computing and caching field/constructor/method signatures
* during serialVersionUID calculation.
*/
private static class MemberSignature {
public final Member member;
public final String name;
public final String signature;
public MemberSignature(Field field) {
member = field;
name = field.getName();
signature = getClassSignature(field.getType());
}
public MemberSignature(Constructor<?> cons) {
member = cons;
name = cons.getName();
signature = getMethodSignature(
cons.getParameterTypes(), Void.TYPE);
}
public MemberSignature(Method meth) {
member = meth;
name = meth.getName();
signature = getMethodSignature(
meth.getParameterTypes(), meth.getReturnType());
}
}
/**
* Class for setting and retrieving serializable field values in batch.
*/
// REMIND: dynamically generate these?
private static class FieldReflector {
/** handle for performing unsafe operations */
private static final Unsafe unsafe = Unsafe.getUnsafe();
/** fields to operate on */
private final ObjectStreamField[] fields;
/** number of primitive fields */
private final int numPrimFields;
/** unsafe field keys for reading fields - may contain dupes */
private final long[] readKeys;
/** unsafe fields keys for writing fields - no dupes */
private final long[] writeKeys;
/** field data offsets */
private final int[] offsets;
/** field type codes */
private final char[] typeCodes;
/** field types */
private final Class<?>[] types;
/**
* Constructs FieldReflector capable of setting/getting values from the
* subset of fields whose ObjectStreamFields contain non-null
* reflective Field objects. ObjectStreamFields with null Fields are
* treated as filler, for which get operations return default values
* and set operations discard given values.
*/
FieldReflector(ObjectStreamField[] fields) {
this.fields = fields;
int nfields = fields.length;
readKeys = new long[nfields];
writeKeys = new long[nfields];
offsets = new int[nfields];
typeCodes = new char[nfields];
ArrayList<Class<?>> typeList = new ArrayList<>();
Set<Long> usedKeys = new HashSet<>();
for (int i = 0; i < nfields; i++) {
ObjectStreamField f = fields[i];
Field rf = f.getField();
long key = (rf != null) ?
unsafe.objectFieldOffset(rf) : Unsafe.INVALID_FIELD_OFFSET;
readKeys[i] = key;
writeKeys[i] = usedKeys.add(key) ?
key : Unsafe.INVALID_FIELD_OFFSET;
offsets[i] = f.getOffset();
typeCodes[i] = f.getTypeCode();
if (!f.isPrimitive()) {
typeList.add((rf != null) ? rf.getType() : null);
}
}
types = typeList.toArray(new Class<?>[typeList.size()]);
numPrimFields = nfields - types.length;
}
/**
* Returns list of ObjectStreamFields representing fields operated on
* by this reflector. The shared/unshared values and Field objects
* contained by ObjectStreamFields in the list reflect their bindings
* to locally defined serializable fields.
*/
ObjectStreamField[] getFields() {
return fields;
}
/**
* Fetches the serializable primitive field values of object obj and
* marshals them into byte array buf starting at offset 0. The caller
* is responsible for ensuring that obj is of the proper type.
*/
void getPrimFieldValues(Object obj, byte[] buf) {
if (obj == null) {
throw new NullPointerException();
}
/* assuming checkDefaultSerialize() has been called on the class
* descriptor this FieldReflector was obtained from, no field keys
* in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
*/
for (int i = 0; i < numPrimFields; i++) {
long key = readKeys[i];
int off = offsets[i];
switch (typeCodes[i]) {
case 'Z' -> Bits.putBoolean(buf, off, unsafe.getBoolean(obj, key));
case 'B' -> buf[off] = unsafe.getByte(obj, key);
case 'C' -> Bits.putChar(buf, off, unsafe.getChar(obj, key));
case 'S' -> Bits.putShort(buf, off, unsafe.getShort(obj, key));
case 'I' -> Bits.putInt(buf, off, unsafe.getInt(obj, key));
case 'F' -> Bits.putFloat(buf, off, unsafe.getFloat(obj, key));
case 'J' -> Bits.putLong(buf, off, unsafe.getLong(obj, key));
case 'D' -> Bits.putDouble(buf, off, unsafe.getDouble(obj, key));
default -> throw new InternalError();
}
}
}
/**
* Sets the serializable primitive fields of object obj using values
* unmarshalled from byte array buf starting at offset 0. The caller
* is responsible for ensuring that obj is of the proper type.
*/
void setPrimFieldValues(Object obj, byte[] buf) {
if (obj == null) {
throw new NullPointerException();
}
for (int i = 0; i < numPrimFields; i++) {
long key = writeKeys[i];
if (key == Unsafe.INVALID_FIELD_OFFSET) {
continue; // discard value
}
int off = offsets[i];
switch (typeCodes[i]) {
case 'Z' -> unsafe.putBoolean(obj, key, Bits.getBoolean(buf, off));
case 'B' -> unsafe.putByte(obj, key, buf[off]);
case 'C' -> unsafe.putChar(obj, key, Bits.getChar(buf, off));
case 'S' -> unsafe.putShort(obj, key, Bits.getShort(buf, off));
case 'I' -> unsafe.putInt(obj, key, Bits.getInt(buf, off));
case 'F' -> unsafe.putFloat(obj, key, Bits.getFloat(buf, off));
case 'J' -> unsafe.putLong(obj, key, Bits.getLong(buf, off));
case 'D' -> unsafe.putDouble(obj, key, Bits.getDouble(buf, off));
default -> throw new InternalError();
}
}
}
/**
* Fetches the serializable object field values of object obj and
* stores them in array vals starting at offset 0. The caller is
* responsible for ensuring that obj is of the proper type.
*/
void getObjFieldValues(Object obj, Object[] vals) {
if (obj == null) {
throw new NullPointerException();
}
/* assuming checkDefaultSerialize() has been called on the class
* descriptor this FieldReflector was obtained from, no field keys
* in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
*/
for (int i = numPrimFields; i < fields.length; i++) {
vals[offsets[i]] = switch (typeCodes[i]) {
case 'L', '[' -> unsafe.getReference(obj, readKeys[i]);
default -> throw new InternalError();
};
}
}
/**
* Checks that the given values, from array vals starting at offset 0,
* are assignable to the given serializable object fields.
* @throws ClassCastException if any value is not assignable
*/
void checkObjectFieldValueTypes(Object obj, Object[] vals) {
setObjFieldValues(obj, vals, true);
}
/**
* Sets the serializable object fields of object obj using values from
* array vals starting at offset 0. The caller is responsible for
* ensuring that obj is of the proper type; however, attempts to set a
* field with a value of the wrong type will trigger an appropriate
* ClassCastException.
*/
void setObjFieldValues(Object obj, Object[] vals) {
setObjFieldValues(obj, vals, false);
}
private void setObjFieldValues(Object obj, Object[] vals, boolean dryRun) {
if (obj == null) {
throw new NullPointerException();
}
for (int i = numPrimFields; i < fields.length; i++) {
long key = writeKeys[i];
if (key == Unsafe.INVALID_FIELD_OFFSET) {
continue; // discard value
}
switch (typeCodes[i]) {
case 'L', '[' -> {
Object val = vals[offsets[i]];
if (val != null &&
!types[i - numPrimFields].isInstance(val))
{
Field f = fields[i].getField();
throw new ClassCastException(
"cannot assign instance of " +
val.getClass().getName() + " to field " +
f.getDeclaringClass().getName() + "." +
f.getName() + " of type " +
f.getType().getName() + " in instance of " +
obj.getClass().getName());
}
if (!dryRun)
unsafe.putReference(obj, key, val);
}
default -> throw new InternalError();
}
}
}
}
/**
* Matches given set of serializable fields with serializable fields
* described by the given local class descriptor, and returns a
* FieldReflector instance capable of setting/getting values from the
* subset of fields that match (non-matching fields are treated as filler,
* for which get operations return default values and set operations
* discard given values). Throws InvalidClassException if unresolvable
* type conflicts exist between the two sets of fields.
*/
private static FieldReflector getReflector(ObjectStreamField[] fields,
ObjectStreamClass localDesc)
throws InvalidClassException
{
// class irrelevant if no fields
Class<?> cl = (localDesc != null && fields.length > 0) ?
localDesc.cl : null;
processQueue(Caches.reflectorsQueue, Caches.reflectors);
FieldReflectorKey key = new FieldReflectorKey(cl, fields,
Caches.reflectorsQueue);
Reference<?> ref = Caches.reflectors.get(key);
Object entry = null;
if (ref != null) {
entry = ref.get();
}
EntryFuture future = null;
if (entry == null) {
EntryFuture newEntry = new EntryFuture();
Reference<?> newRef = new SoftReference<>(newEntry);
do {
if (ref != null) {
Caches.reflectors.remove(key, ref);
}
ref = Caches.reflectors.putIfAbsent(key, newRef);
if (ref != null) {
entry = ref.get();
}
} while (ref != null && entry == null);
if (entry == null) {
future = newEntry;
}
}
if (entry instanceof FieldReflector) { // check common case first
return (FieldReflector) entry;
} else if (entry instanceof EntryFuture) {
entry = ((EntryFuture) entry).get();
} else if (entry == null) {
try {
entry = new FieldReflector(matchFields(fields, localDesc));
} catch (Throwable th) {
entry = th;
}
future.set(entry);
Caches.reflectors.put(key, new SoftReference<>(entry));
}
if (entry instanceof FieldReflector) {
return (FieldReflector) entry;
} else if (entry instanceof InvalidClassException) {
throw (InvalidClassException) entry;
} else if (entry instanceof RuntimeException) {
throw (RuntimeException) entry;
} else if (entry instanceof Error) {
throw (Error) entry;
} else {
throw new InternalError("unexpected entry: " + entry);
}
}
/**
* FieldReflector cache lookup key. Keys are considered equal if they
* refer to the same class and equivalent field formats.
*/
private static class FieldReflectorKey extends WeakReference<Class<?>> {
private final String[] sigs;
private final int hash;
private final boolean nullClass;
FieldReflectorKey(Class<?> cl, ObjectStreamField[] fields,
ReferenceQueue<Class<?>> queue)
{
super(cl, queue);
nullClass = (cl == null);
sigs = new String[2 * fields.length];
for (int i = 0, j = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i];
sigs[j++] = f.getName();
sigs[j++] = f.getSignature();
}
hash = System.identityHashCode(cl) + Arrays.hashCode(sigs);
}
public int hashCode() {
return hash;
}
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof FieldReflectorKey other) {
Class<?> referent;
return (nullClass ? other.nullClass
: ((referent = get()) != null) &&
(other.refersTo(referent))) &&
Arrays.equals(sigs, other.sigs);
} else {
return false;
}
}
}
/**
* Matches given set of serializable fields with serializable fields
* obtained from the given local class descriptor (which contain bindings
* to reflective Field objects). Returns list of ObjectStreamFields in
* which each ObjectStreamField whose signature matches that of a local
* field contains a Field object for that field; unmatched
* ObjectStreamFields contain null Field objects. Shared/unshared settings
* of the returned ObjectStreamFields also reflect those of matched local
* ObjectStreamFields. Throws InvalidClassException if unresolvable type
* conflicts exist between the two sets of fields.
*/
private static ObjectStreamField[] matchFields(ObjectStreamField[] fields,
ObjectStreamClass localDesc)
throws InvalidClassException
{
ObjectStreamField[] localFields = (localDesc != null) ?
localDesc.fields : NO_FIELDS;
/*
* Even if fields == localFields, we cannot simply return localFields
* here. In previous implementations of serialization,
* ObjectStreamField.getType() returned Object.class if the
* ObjectStreamField represented a non-primitive field and belonged to
* a non-local class descriptor. To preserve this (questionable)
* behavior, the ObjectStreamField instances returned by matchFields
* cannot report non-primitive types other than Object.class; hence
* localFields cannot be returned directly.
*/
ObjectStreamField[] matches = new ObjectStreamField[fields.length];
for (int i = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i], m = null;
for (int j = 0; j < localFields.length; j++) {
ObjectStreamField lf = localFields[j];
if (f.getName().equals(lf.getName())) {
if ((f.isPrimitive() || lf.isPrimitive()) &&
f.getTypeCode() != lf.getTypeCode())
{
throw new InvalidClassException(localDesc.name,
"incompatible types for field " + f.getName());
}
if (lf.getField() != null) {
m = new ObjectStreamField(
lf.getField(), lf.isUnshared(), false);
} else {
m = new ObjectStreamField(
lf.getName(), lf.getSignature(), lf.isUnshared());
}
}
}
if (m == null) {
m = new ObjectStreamField(
f.getName(), f.getSignature(), false);
}
m.setOffset(f.getOffset());
matches[i] = m;
}
return matches;
}
/**
* Removes from the specified map any keys that have been enqueued
* on the specified reference queue.
*/
static void processQueue(ReferenceQueue<Class<?>> queue,
ConcurrentMap<? extends
WeakReference<Class<?>>, ?> map)
{
Reference<? extends Class<?>> ref;
while((ref = queue.poll()) != null) {
map.remove(ref);
}
}
/**
* Weak key for Class objects.
*
**/
static class WeakClassKey extends WeakReference<Class<?>> {
/**
* saved value of the referent's identity hash code, to maintain
* a consistent hash code after the referent has been cleared
*/
private final int hash;
/**
* Create a new WeakClassKey to the given object, registered
* with a queue.
*/
WeakClassKey(Class<?> cl, ReferenceQueue<Class<?>> refQueue) {
super(cl, refQueue);
hash = System.identityHashCode(cl);
}
/**
* Returns the identity hash code of the original referent.
*/
public int hashCode() {
return hash;
}
/**
* Returns true if the given object is this identical
* WeakClassKey instance, or, if this object's referent has not
* been cleared, if the given object is another WeakClassKey
* instance with the identical non-null referent as this one.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof WeakClassKey) {
Class<?> referent = get();
return (referent != null) &&
(((WeakClassKey) obj).refersTo(referent));
} else {
return false;
}
}
}
/**
* A LRA cache of record deserialization constructors.
*/
@SuppressWarnings("serial")
private static final class DeserializationConstructorsCache
extends ConcurrentHashMap<DeserializationConstructorsCache.Key, MethodHandle> {
// keep max. 10 cached entries - when the 11th element is inserted the oldest
// is removed and 10 remains - 11 is the biggest map size where internal
// table of 16 elements is sufficient (inserting 12th element would resize it to 32)
private static final int MAX_SIZE = 10;
private Key.Impl first, last; // first and last in FIFO queue
DeserializationConstructorsCache() {
// start small - if there is more than one shape of ObjectStreamClass
// deserialized, there will typically be two (current version and previous version)
super(2);
}
MethodHandle get(ObjectStreamField[] fields) {
return get(new Key.Lookup(fields));
}
synchronized MethodHandle putIfAbsentAndGet(ObjectStreamField[] fields, MethodHandle mh) {
Key.Impl key = new Key.Impl(fields);
var oldMh = putIfAbsent(key, mh);
if (oldMh != null) return oldMh;
// else we did insert new entry -> link the new key as last
if (last == null) {
last = first = key;
} else {
last = (last.next = key);
}
// may need to remove first
if (size() > MAX_SIZE) {
assert first != null;
remove(first);
first = first.next;
if (first == null) {
last = null;
}
}
return mh;
}
// a key composed of ObjectStreamField[] names and types
static abstract class Key {
abstract int length();
abstract String fieldName(int i);
abstract Class<?> fieldType(int i);
@Override
public final int hashCode() {
int n = length();
int h = 0;
for (int i = 0; i < n; i++) h = h * 31 + fieldType(i).hashCode();
for (int i = 0; i < n; i++) h = h * 31 + fieldName(i).hashCode();
return h;
}
@Override
public final boolean equals(Object obj) {
if (!(obj instanceof Key other)) return false;
int n = length();
if (n != other.length()) return false;
for (int i = 0; i < n; i++) if (fieldType(i) != other.fieldType(i)) return false;
for (int i = 0; i < n; i++) if (!fieldName(i).equals(other.fieldName(i))) return false;
return true;
}
// lookup key - just wraps ObjectStreamField[]
static final class Lookup extends Key {
final ObjectStreamField[] fields;
Lookup(ObjectStreamField[] fields) { this.fields = fields; }
@Override
int length() { return fields.length; }
@Override
String fieldName(int i) { return fields[i].getName(); }
@Override
Class<?> fieldType(int i) { return fields[i].getType(); }
}
// real key - copies field names and types and forms FIFO queue in cache
static final class Impl extends Key {
Impl next;
final String[] fieldNames;
final Class<?>[] fieldTypes;
Impl(ObjectStreamField[] fields) {
this.fieldNames = new String[fields.length];
this.fieldTypes = new Class<?>[fields.length];
for (int i = 0; i < fields.length; i++) {
fieldNames[i] = fields[i].getName();
fieldTypes[i] = fields[i].getType();
}
}
@Override
int length() { return fieldNames.length; }
@Override
String fieldName(int i) { return fieldNames[i]; }
@Override
Class<?> fieldType(int i) { return fieldTypes[i]; }
}
}
}
/** Record specific support for retrieving and binding stream field values. */
static final class RecordSupport {
/**
* Returns canonical record constructor adapted to take two arguments:
* {@code (byte[] primValues, Object[] objValues)}
* and return
* {@code Object}
*/
@SuppressWarnings("removal")
static MethodHandle deserializationCtr(ObjectStreamClass desc) {
// check the cached value 1st
MethodHandle mh = desc.deserializationCtr;
if (mh != null) return mh;
mh = desc.deserializationCtrs.get(desc.getFields(false));
if (mh != null) return desc.deserializationCtr = mh;
// retrieve record components
RecordComponent[] recordComponents;
try {
Class<?> cls = desc.forClass();
PrivilegedExceptionAction<RecordComponent[]> pa = cls::getRecordComponents;
recordComponents = AccessController.doPrivileged(pa);
} catch (PrivilegedActionException e) {
throw new InternalError(e.getCause());
}
// retrieve the canonical constructor
// (T1, T2, ..., Tn):TR
mh = desc.getRecordConstructor();
// change return type to Object
// (T1, T2, ..., Tn):TR -> (T1, T2, ..., Tn):Object
mh = mh.asType(mh.type().changeReturnType(Object.class));
// drop last 2 arguments representing primValues and objValues arrays
// (T1, T2, ..., Tn):Object -> (T1, T2, ..., Tn, byte[], Object[]):Object
mh = MethodHandles.dropArguments(mh, mh.type().parameterCount(), byte[].class, Object[].class);
for (int i = recordComponents.length-1; i >= 0; i--) {
String name = recordComponents[i].getName();
Class<?> type = recordComponents[i].getType();
// obtain stream field extractor that extracts argument at
// position i (Ti+1) from primValues and objValues arrays
// (byte[], Object[]):Ti+1
MethodHandle combiner = streamFieldExtractor(name, type, desc);
// fold byte[] privValues and Object[] objValues into argument at position i (Ti+1)
// (..., Ti, Ti+1, byte[], Object[]):Object -> (..., Ti, byte[], Object[]):Object
mh = MethodHandles.foldArguments(mh, i, combiner);
}
// what we are left with is a MethodHandle taking just the primValues
// and objValues arrays and returning the constructed record instance
// (byte[], Object[]):Object
// store it into cache and return the 1st value stored
return desc.deserializationCtr =
desc.deserializationCtrs.putIfAbsentAndGet(desc.getFields(false), mh);
}
/** Returns the number of primitive fields for the given descriptor. */
private static int numberPrimValues(ObjectStreamClass desc) {
ObjectStreamField[] fields = desc.getFields();
int primValueCount = 0;
for (int i = 0; i < fields.length; i++) {
if (fields[i].isPrimitive())
primValueCount++;
else
break; // can be no more
}
return primValueCount;
}
/**
* Returns extractor MethodHandle taking the primValues and objValues arrays
* and extracting the argument of canonical constructor with given name and type
* or producing default value for the given type if the field is absent.
*/
private static MethodHandle streamFieldExtractor(String pName,
Class<?> pType,
ObjectStreamClass desc) {
ObjectStreamField[] fields = desc.getFields(false);
for (int i = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i];
String fName = f.getName();
if (!fName.equals(pName))
continue;
Class<?> fType = f.getField().getType();
if (!pType.isAssignableFrom(fType))
throw new InternalError(fName + " unassignable, pType:" + pType + ", fType:" + fType);
if (f.isPrimitive()) {
// (byte[], int):fType
MethodHandle mh = PRIM_VALUE_EXTRACTORS.get(fType);
if (mh == null) {
throw new InternalError("Unexpected type: " + fType);
}
// bind offset
// (byte[], int):fType -> (byte[]):fType
mh = MethodHandles.insertArguments(mh, 1, f.getOffset());
// drop objValues argument
// (byte[]):fType -> (byte[], Object[]):fType
mh = MethodHandles.dropArguments(mh, 1, Object[].class);
// adapt return type to pType
// (byte[], Object[]):fType -> (byte[], Object[]):pType
if (pType != fType) {
mh = mh.asType(mh.type().changeReturnType(pType));
}
return mh;
} else { // reference
// (Object[], int):Object
MethodHandle mh = MethodHandles.arrayElementGetter(Object[].class);
// bind index
// (Object[], int):Object -> (Object[]):Object
mh = MethodHandles.insertArguments(mh, 1, i - numberPrimValues(desc));
// drop primValues argument
// (Object[]):Object -> (byte[], Object[]):Object
mh = MethodHandles.dropArguments(mh, 0, byte[].class);
// adapt return type to pType
// (byte[], Object[]):Object -> (byte[], Object[]):pType
if (pType != Object.class) {
mh = mh.asType(mh.type().changeReturnType(pType));
}
return mh;
}
}
// return default value extractor if no field matches pName
return MethodHandles.empty(MethodType.methodType(pType, byte[].class, Object[].class));
}
private static final Map<Class<?>, MethodHandle> PRIM_VALUE_EXTRACTORS;
static {
var lkp = MethodHandles.lookup();
try {
PRIM_VALUE_EXTRACTORS = Map.of(
byte.class, MethodHandles.arrayElementGetter(byte[].class),
short.class, lkp.findStatic(Bits.class, "getShort", MethodType.methodType(short.class, byte[].class, int.class)),
int.class, lkp.findStatic(Bits.class, "getInt", MethodType.methodType(int.class, byte[].class, int.class)),
long.class, lkp.findStatic(Bits.class, "getLong", MethodType.methodType(long.class, byte[].class, int.class)),
float.class, lkp.findStatic(Bits.class, "getFloat", MethodType.methodType(float.class, byte[].class, int.class)),
double.class, lkp.findStatic(Bits.class, "getDouble", MethodType.methodType(double.class, byte[].class, int.class)),
char.class, lkp.findStatic(Bits.class, "getChar", MethodType.methodType(char.class, byte[].class, int.class)),
boolean.class, lkp.findStatic(Bits.class, "getBoolean", MethodType.methodType(boolean.class, byte[].class, int.class))
);
} catch (NoSuchMethodException | IllegalAccessException e) {
throw new InternalError("Can't lookup Bits.getXXX", e);
}
}
}
}
⏎ java/io/ObjectStreamClass.java
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2023-09-26, 44308👍, 1💬
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