commit 3ece3b6a87e4bf61a1f786c12d796012becce313
Date:   Thu May 28 10:30:20 2020 +0800

    Add FastSerializer
    
    Summary:<core-libs>:  Add FastSerializer
    LLT: jtreg
    Bug url: NA

diff --git a/hotspot/src/share/vm/prims/unsafe.cpp b/hotspot/src/share/vm/prims/unsafe.cpp
index cdb72c0d5..d50041635 100644
--- a/hotspot/src/share/vm/prims/unsafe.cpp
+++ b/hotspot/src/share/vm/prims/unsafe.cpp
@@ -1361,6 +1361,10 @@ UNSAFE_ENTRY(void, Unsafe_PrefetchWrite(JNIEnv* env, jclass ignored, jobject obj
   Prefetch::write(addr, (intx)offset);
 UNSAFE_END
 
+UNSAFE_ENTRY(jboolean, Unsafe_GetUseFastSerializer(JNIEnv *env, jobject unsafe)) {
+  return UseFastSerializer;
+}
+UNSAFE_END
 
 /// JVM_RegisterUnsafeMethods
 
@@ -1447,7 +1451,8 @@ static JNINativeMethod methods_140[] = {
     {CC "allocateInstance",   CC "(" CLS ")" OBJ,             FN_PTR(Unsafe_AllocateInstance)},
     {CC "monitorEnter",       CC "(" OBJ ")V",               FN_PTR(Unsafe_MonitorEnter)},
     {CC "monitorExit",        CC "(" OBJ ")V",               FN_PTR(Unsafe_MonitorExit)},
-    {CC "throwException",     CC "(" THR ")V",               FN_PTR(Unsafe_ThrowException)}
+    {CC "throwException",     CC "(" THR ")V",               FN_PTR(Unsafe_ThrowException)},
+    {CC "getUseFastSerializer",   CC "()Z",              FN_PTR(Unsafe_GetUseFastSerializer)}
 };
 
 // These are the methods prior to the JSR 166 changes in 1.5.0
@@ -1493,8 +1498,8 @@ static JNINativeMethod methods_141[] = {
     {CC "allocateInstance",   CC "(" CLS ")" OBJ,             FN_PTR(Unsafe_AllocateInstance)},
     {CC "monitorEnter",       CC "(" OBJ ")V",               FN_PTR(Unsafe_MonitorEnter)},
     {CC "monitorExit",        CC "(" OBJ ")V",               FN_PTR(Unsafe_MonitorExit)},
-    {CC "throwException",     CC "(" THR ")V",               FN_PTR(Unsafe_ThrowException)}
-
+    {CC "throwException",     CC "(" THR ")V",               FN_PTR(Unsafe_ThrowException)},
+    {CC "getUseFastSerializer",   CC "()Z",              FN_PTR(Unsafe_GetUseFastSerializer)}
 };
 
 // These are the methods prior to the JSR 166 changes in 1.6.0
@@ -1548,7 +1553,8 @@ static JNINativeMethod methods_15[] = {
     {CC "compareAndSwapInt",  CC "(" OBJ "J""I""I"")Z",      FN_PTR(Unsafe_CompareAndSwapInt)},
     {CC "compareAndSwapLong", CC "(" OBJ "J""J""J"")Z",      FN_PTR(Unsafe_CompareAndSwapLong)},
     {CC "park",               CC "(ZJ)V",                  FN_PTR(Unsafe_Park)},
-    {CC "unpark",             CC "(" OBJ ")V",               FN_PTR(Unsafe_Unpark)}
+    {CC "unpark",             CC "(" OBJ ")V",               FN_PTR(Unsafe_Unpark)},
+    {CC "getUseFastSerializer",   CC "()Z",              FN_PTR(Unsafe_GetUseFastSerializer)}
 
 };
 
@@ -1606,7 +1612,8 @@ static JNINativeMethod methods_16[] = {
     {CC "putOrderedInt",      CC "(" OBJ "JI)V",             FN_PTR(Unsafe_SetOrderedInt)},
     {CC "putOrderedLong",     CC "(" OBJ "JJ)V",             FN_PTR(Unsafe_SetOrderedLong)},
     {CC "park",               CC "(ZJ)V",                  FN_PTR(Unsafe_Park)},
-    {CC "unpark",             CC "(" OBJ ")V",               FN_PTR(Unsafe_Unpark)}
+    {CC "unpark",             CC "(" OBJ ")V",               FN_PTR(Unsafe_Unpark)},
+    {CC "getUseFastSerializer",   CC "()Z",              FN_PTR(Unsafe_GetUseFastSerializer)}
 };
 
 // These are the methods for 1.8.0
@@ -1662,7 +1669,8 @@ static JNINativeMethod methods_18[] = {
     {CC "putOrderedInt",      CC "(" OBJ "JI)V",             FN_PTR(Unsafe_SetOrderedInt)},
     {CC "putOrderedLong",     CC "(" OBJ "JJ)V",             FN_PTR(Unsafe_SetOrderedLong)},
     {CC "park",               CC "(ZJ)V",                  FN_PTR(Unsafe_Park)},
-    {CC "unpark",             CC "(" OBJ ")V",               FN_PTR(Unsafe_Unpark)}
+    {CC "unpark",             CC "(" OBJ ")V",               FN_PTR(Unsafe_Unpark)},
+    {CC "getUseFastSerializer",   CC "()Z",              FN_PTR(Unsafe_GetUseFastSerializer)}
 };
 
 JNINativeMethod loadavg_method[] = {
diff --git a/hotspot/src/share/vm/runtime/globals.hpp b/hotspot/src/share/vm/runtime/globals.hpp
index 2e6ff26ed..0a6ebfae1 100644
--- a/hotspot/src/share/vm/runtime/globals.hpp
+++ b/hotspot/src/share/vm/runtime/globals.hpp
@@ -553,6 +553,10 @@ class CommandLineFlags {
           "Enable normal processing of flags relating to experimental "     \
           "features")                                                       \
                                                                             \
+  experimental(bool, UseFastSerializer, false,                              \
+          "Cache-based serialization.It is extremely fast, but it can only" \
+          "be effective in certain scenarios.")                             \
+                                                                            \
   product(bool, JavaMonitorsInStackTrace, true,                             \
           "Print information about Java monitor locks when the stacks are"  \
           "dumped")                                                         \
diff --git a/jdk/src/share/classes/java/io/ObjectInputStream.java b/jdk/src/share/classes/java/io/ObjectInputStream.java
index 5d30f2a01..b67f01719 100644
--- a/jdk/src/share/classes/java/io/ObjectInputStream.java
+++ b/jdk/src/share/classes/java/io/ObjectInputStream.java
@@ -52,6 +52,7 @@ import sun.misc.JavaOISAccess;
 import sun.util.logging.PlatformLogger;
 import sun.security.action.GetBooleanAction;
 import sun.security.action.GetIntegerAction;
+import sun.misc.Unsafe;

 /**
  * An ObjectInputStream deserializes primitive data and objects previously
@@ -284,6 +285,22 @@ public class ObjectInputStream
             traceLogger = (filterLog != null &&
                 filterLog.isLoggable(PlatformLogger.Level.FINER)) ? filterLog : null;
         }
+
+        /*
+         * Logger for FastSerializer.
+         * Setup the FastSerializer logger if it is set to FINE
+         * (Assuming it will not change).
+         */
+        private static final PlatformLogger fastSerLogger;
+        static {
+            if (printFastSerializer) {
+                PlatformLogger fastSerLog = PlatformLogger.getLogger("fastSerializer");
+                fastSerLogger = (fastSerLog != null &&
+                    fastSerLog.isLoggable(PlatformLogger.Level.FINE)) ? fastSerLog : null;
+            } else {
+                fastSerLogger = null;
+            }
+        }
     }
 
     /** filter stream for handling block data conversion */
@@ -312,6 +329,9 @@ public class ObjectInputStream
     /** if true, invoke resolveObject() */
     private boolean enableResolve;
 
+    /** Used to get the commandline option: useFastSerializer */
+    private static final Unsafe UNSAFE = Unsafe.getUnsafe();
+
     /**
      * Context during upcalls to class-defined readObject methods; holds
      * object currently being deserialized and descriptor for current class.
@@ -325,6 +345,38 @@ public class ObjectInputStream
      */
     private ObjectInputFilter serialFilter;
 
+    /**
+     * value of "useFastSerializer" property
+     */
+    private static final boolean defaultFastSerializer = UNSAFE.getUseFastSerializer();
+
+    /**
+     *  true or false for open FastSerilizer
+     *  May be changed in readStreamHeader
+     */
+    private boolean useFastSerializer = defaultFastSerializer;
+
+    /**
+     * Value of "fastSerializerEscapeMode" property. It can be turned on
+     * when useFastSerializer is true.
+     */
+    private static final boolean fastSerializerEscapeMode = java.security.AccessController.doPrivileged(
+            new sun.security.action.GetBooleanAction(
+                    "fastSerializerEscapeMode")).booleanValue();
+
+    /**
+     * value of  "printFastSerializer" property,
+     * as true or false for printing FastSerializer logs.
+     */
+    private static final boolean printFastSerializer = java.security.AccessController.doPrivileged(
+            new sun.security.action.GetBooleanAction(
+                    "printFastSerializer")).booleanValue();
+
+    /**
+     * Magic number that is written to the stream header when using fastserilizer.
+     */
+    private static final short STREAM_MAGIC_FAST = (short)0xdeca;
+
     /**
      * Creates an ObjectInputStream that reads from the specified InputStream.
      * A serialization stream header is read from the stream and verified.
@@ -396,6 +443,9 @@ public class ObjectInputStream
      * transitively so that a complete equivalent graph of objects is
      * reconstructed by readObject.
      *
+     * The difference between fastSerialzation and default serialization is the
+     * descriptor serialization. The data serialization is same with each other.
+     *
      * <p>The root object is completely restored when all of its fields and the
      * objects it references are completely restored.  At this point the object
      * validation callbacks are executed in order based on their registered
@@ -670,11 +720,20 @@ public class ObjectInputStream
         vlist.register(obj, prio);
     }
 
+    /**
+     * Cache the class meta during serialization.
+     * Only used in FastSerilizer.
+     */
+    protected static ConcurrentHashMap<String,Class<?>> nameToClass = new ConcurrentHashMap<>();
+
     /**
      * Load the local class equivalent of the specified stream class
      * description.  Subclasses may implement this method to allow classes to
      * be fetched from an alternate source.
      *
+     * When fastSerializer is turned on, fields of desc will be null except
+     * name. When resolveClass is override, this may cause null pointer exception.
+     *
      * <p>The corresponding method in <code>ObjectOutputStream</code> is
      * <code>annotateClass</code>.  This method will be invoked only once for
      * each unique class in the stream.  This method can be implemented by
@@ -715,16 +774,27 @@ public class ObjectInputStream
         throws IOException, ClassNotFoundException
     {
         String name = desc.getName();
+        Class<?> cl = null;
+
+        if (useFastSerializer) {
+            cl = nameToClass.get(name);
+             if (cl != null) {
+                 return cl;
+             }
+        }
         try {
-            return Class.forName(name, false, latestUserDefinedLoader());
+            cl = Class.forName(name, false, latestUserDefinedLoader());
         } catch (ClassNotFoundException ex) {
-            Class<?> cl = primClasses.get(name);
-            if (cl != null) {
-                return cl;
-            } else {
+            cl = primClasses.get(name);
+            if (cl == null) {
                 throw ex;
             }
         }
+        if (useFastSerializer) {
+            nameToClass.put(name, cl);
+        }
+
+        return cl;
     }
 
     /**
@@ -894,9 +964,34 @@ public class ObjectInputStream
     {
         short s0 = bin.readShort();
         short s1 = bin.readShort();
-        if (s0 != STREAM_MAGIC || s1 != STREAM_VERSION) {
-            throw new StreamCorruptedException(
-                String.format("invalid stream header: %04X%04X", s0, s1));
+        if (useFastSerializer) {
+            if (s0 != STREAM_MAGIC_FAST || s1 != STREAM_VERSION) {
+
+                if (s0 != STREAM_MAGIC) {
+                    throw new StreamCorruptedException(
+                            String.format("invalid stream header: %04X%04X, and FastSerializer is activated", s0, s1));
+                }
+
+                if (!fastSerializerEscapeMode) {
+                    throw new StreamCorruptedException(
+                            String.format("invalid stream header: %04X%04X.Fast serialization does not support " +
+                                          "original serialized files", s0, s1));
+                }
+
+                // Escape to default serialization
+                useFastSerializer = false;
+                if (Logging.fastSerLogger != null) {
+                    Logging.fastSerLogger.fine("[Deserialize]: Escape and disable FastSerializer");
+                }
+            }
+        } else if (s0 != STREAM_MAGIC || s1 != STREAM_VERSION) {
+            if (s0 == STREAM_MAGIC_FAST && s1 == STREAM_VERSION) {
+                throw new StreamCorruptedException(
+                        String.format("invalid stream header: %04X%04X, and it is a FastSerializer stream", s0, s1));
+            } else {
+                throw new StreamCorruptedException(
+                        String.format("invalid stream header: %04X%04X", s0, s1));
+            }
         }
     }
 
@@ -910,6 +1005,11 @@ public class ObjectInputStream
      * this method reads class descriptors according to the format defined in
      * the Object Serialization specification.
      *
+     * In fastSerialize mode, the descriptor is obtained by lookup method. And
+     * the resolveClass method is called here to get the classmeta. Since the
+     * descriptor is obtained by lookup, the descriptor is same as localdesc.
+     * So we cann't distinguish the receiver desc and local desc.
+     *
      * @return  the class descriptor read
      * @throws  IOException If an I/O error has occurred.
      * @throws  ClassNotFoundException If the Class of a serialized object used
@@ -920,6 +1020,27 @@ public class ObjectInputStream
     protected ObjectStreamClass readClassDescriptor()
         throws IOException, ClassNotFoundException
     {
+        // fastSerializer
+        if (useFastSerializer) {
+            String name = readUTF();
+            Class<?> cl = null;
+            ObjectStreamClass desc = new ObjectStreamClass(name);
+            try {
+                // In order to match this method, we add an annotateClass method in
+                // writeClassDescriptor.
+                cl = resolveClass(desc);
+            } catch (ClassNotFoundException ex) {
+                // resolveClass is just used to obtain Class which required by lookup method
+                // and it will be called again later, so we don't throw ClassNotFoundException here.
+                return desc;
+            }
+            if (cl != null) {
+                desc = ObjectStreamClass.lookup(cl, true);
+            }
+            return desc;
+        }
+
+        // Default deserialization. If the Class cannot be found, throw ClassNotFoundException.
         ObjectStreamClass desc = new ObjectStreamClass();
         desc.readNonProxy(this);
         return desc;
@@ -1996,41 +2090,64 @@ private ObjectStreamClass readNonProxyDesc(boolean unshared)
 
         skipCustomData();
 
-        try {
-            totalObjectRefs++;
-            depth++;
-            desc.initNonProxy(readDesc, cl, resolveEx, readClassDesc(false));
-
-            if (cl != null) {
-                // Check that serial filtering has been done on the local class descriptor's superclass,
-                // in case it does not appear in the stream.
-
-                // Find the next super descriptor that has a local class descriptor.
-                // Descriptors for which there is no local class are ignored.
-                ObjectStreamClass superLocal = null;
-                for (ObjectStreamClass sDesc = desc.getSuperDesc(); sDesc != null; sDesc = sDesc.getSuperDesc()) {
-                    if ((superLocal = sDesc.getLocalDesc()) != null) {
-                        break;
-                    }
-                }
-
-                // Scan local descriptor superclasses for a match with the local descriptor of the super found above.
-                // For each super descriptor before the match, invoke the serial filter on the class.
-                // The filter is invoked for each class that has not already been filtered
-                // but would be filtered if the instance had been serialized by this Java runtime.
-                for (ObjectStreamClass lDesc = desc.getLocalDesc().getSuperDesc();
-                     lDesc != null && lDesc != superLocal;
-                     lDesc = lDesc.getSuperDesc()) {
-                    filterCheck(lDesc.forClass(), -1);
-                }
-            }
-        } finally {
-            depth--;
+        totalObjectRefs++;
+        depth++;
+
+        if (useFastSerializer) {
+            desc.initNonProxyFast(readDesc, resolveEx);
+            ObjectStreamClass superDesc = desc.getSuperDesc();
+            long originDepth = depth - 1;
+            // Since desc is obtained from the lookup method, we will lose the depth and
+            // totalObjectRefs of superDesc. So we add a loop here to compute the depth
+            // and objectRef of superDesc.
+            while (superDesc != null && superDesc.forClass() != null) {
+                filterCheck(superDesc.forClass(), -1);
+                superDesc = superDesc.getSuperDesc();
+                totalObjectRefs++;
+                depth++;
+            }
+            depth = originDepth;
+        } else {
+            try {
+                desc.initNonProxy(readDesc, cl, resolveEx, readClassDesc(false));
+
+                if (cl != null) {
+                    // Check that serial filtering has been done on the local class descriptor's superclass,
+                    // in case it does not appear in the stream.
+
+                    // Find the next super descriptor that has a local class descriptor.
+                    // Descriptors for which there is no local class are ignored.
+                    ObjectStreamClass superLocal = null;
+                    for (ObjectStreamClass sDesc = desc.getSuperDesc(); sDesc != null; sDesc = sDesc.getSuperDesc()) {
+                        if ((superLocal = sDesc.getLocalDesc()) != null) {
+                            break;
+                        }
+                    }
+
+                    // Scan local descriptor superclasses for a match with the local descriptor of the super found above.
+                    // For each super descriptor before the match, invoke the serial filter on the class.
+                    // The filter is invoked for each class that has not already been filtered
+                    // but would be filtered if the instance had been serialized by this Java runtime.
+                    for (ObjectStreamClass lDesc = desc.getLocalDesc().getSuperDesc();
+                         lDesc != null && lDesc != superLocal;
+                         lDesc = lDesc.getSuperDesc()) {
+                        filterCheck(lDesc.forClass(), -1);
+                    }
+                }
+            } finally {
+                depth--;
+            }
         }
 
         handles.finish(descHandle);
         passHandle = descHandle;
 
+        if (Logging.fastSerLogger != null) {
+            Logging.fastSerLogger.fine(
+                    "[Deserialize] useFastSerializer:{0}, Class name:{1}, SerialVersionUID:{2}, flags:{3}",
+                    useFastSerializer, desc.getName(), desc.getSerialVersionUID(), desc.getFlags(this));
+        }
+
         return desc;
     }
 
@@ -2334,21 +2478,25 @@ public class ObjectInputStream
             desc.setPrimFieldValues(obj, primVals);
         }
 
-        int objHandle = passHandle;
-        ObjectStreamField[] fields = desc.getFields(false);
-        Object[] objVals = new Object[desc.getNumObjFields()];
-        int numPrimFields = fields.length - objVals.length;
-        for (int i = 0; i < objVals.length; i++) {
-            ObjectStreamField f = fields[numPrimFields + i];
-            objVals[i] = readObject0(Object.class, f.isUnshared());
-            if (f.getField() != null) {
-                handles.markDependency(objHandle, passHandle);
+        Object[] objVals = null;
+        int numObjFields = desc.getNumObjFields();
+        if (numObjFields > 0) {
+            int objHandle = passHandle;
+            ObjectStreamField[] fields = desc.getFields(false);
+            objVals = new Object[numObjFields];
+            int numPrimFields = fields.length - objVals.length;
+            for (int i = 0; i < objVals.length; i++) {
+                ObjectStreamField f = fields[numPrimFields + i];
+                objVals[i] = readObject0(Object.class, f.isUnshared());
+                if (f.getField() != null) {
+                    handles.markDependency(objHandle, passHandle);
+                }
             }
+            if (obj != null) {
+                desc.setObjFieldValues(obj, objVals);
+            }
+            passHandle = objHandle;
         }
-        if (obj != null) {
-            desc.setObjFieldValues(obj, objVals);
-        }
-        passHandle = objHandle;
     }
 
     /**
diff --git a/jdk/src/share/classes/java/io/ObjectOutputStream.java b/jdk/src/share/classes/java/io/ObjectOutputStream.java
index 6d29e3a1f..3890efc3e 100644
--- a/jdk/src/share/classes/java/io/ObjectOutputStream.java
+++ b/jdk/src/share/classes/java/io/ObjectOutputStream.java
@@ -37,6 +37,8 @@ import java.util.concurrent.ConcurrentMap;
 import static java.io.ObjectStreamClass.processQueue;
 import java.io.SerialCallbackContext;
 import sun.reflect.misc.ReflectUtil;
+import sun.misc.Unsafe;
+import sun.util.logging.PlatformLogger;
 
 /**
  * An ObjectOutputStream writes primitive data types and graphs of Java objects
@@ -173,6 +175,24 @@ public class ObjectOutputStream
             new ReferenceQueue<>();
     }
 
+    private static class Logging {
+        /*
+         * Logger for FastSerializer.
+         * Setup the FastSerializer logger if it is set to FINE.
+         * (Assuming it will not change).
+         */
+        static final PlatformLogger fastSerLogger;
+        static {
+            if (printFastSerializer) {
+                PlatformLogger fastSerLog = PlatformLogger.getLogger("fastSerializer");
+                fastSerLogger = (fastSerLog != null &&
+                        fastSerLog.isLoggable(PlatformLogger.Level.FINE)) ? fastSerLog : null;
+            } else {
+                fastSerLogger = null;
+            }
+        }
+    }
+
     /** filter stream for handling block data conversion */
     private final BlockDataOutputStream bout;
     /** obj -> wire handle map */
@@ -214,6 +234,27 @@ public class ObjectOutputStream
             new sun.security.action.GetBooleanAction(
                 "sun.io.serialization.extendedDebugInfo")).booleanValue();
 
+    /**
+     * Magic number that is written to the stream header when using fastserilizer.
+     */
+    private static final short STREAM_MAGIC_FAST = (short)0xdeca;
+
+    private static final Unsafe UNSAFE = Unsafe.getUnsafe();
+
+    /**
+     * Value of "UseFastSerializer" property. The fastSerializer is turned
+     * on when it is true.
+     */
+    private static final boolean useFastSerializer = UNSAFE.getUseFastSerializer();
+
+    /**
+     * value of  "printFastSerializer" property,
+     * as true or false for printing FastSerializer logs.
+     */
+    private static final boolean printFastSerializer = java.security.AccessController.doPrivileged(
+            new sun.security.action.GetBooleanAction(
+                    "printFastSerializer")).booleanValue();
+
     /**
      * Creates an ObjectOutputStream that writes to the specified OutputStream.
      * This constructor writes the serialization stream header to the
@@ -327,6 +363,9 @@ public class ObjectOutputStream
      * object are written transitively so that a complete equivalent graph of
      * objects can be reconstructed by an ObjectInputStream.
      *
+     * The difference between fastSerialzation and default serialization is the
+     * descriptor serialization. The data serialization is same with each other.
+     *
      * <p>Exceptions are thrown for problems with the OutputStream and for
      * classes that should not be serialized.  All exceptions are fatal to the
      * OutputStream, which is left in an indeterminate state, and it is up to
@@ -633,7 +672,11 @@ public class ObjectOutputStream
      *          stream
      */
     protected void writeStreamHeader() throws IOException {
-        bout.writeShort(STREAM_MAGIC);
+        if (useFastSerializer) {
+            bout.writeShort(STREAM_MAGIC_FAST);
+        } else {
+            bout.writeShort(STREAM_MAGIC);
+        }
         bout.writeShort(STREAM_VERSION);
     }
 
@@ -648,6 +691,9 @@ public class ObjectOutputStream
      * By default, this method writes class descriptors according to the format
      * defined in the Object Serialization specification.
      *
+     * In fastSerializer mode, we will only write the classname to the stream.
+     * The annotateClass is used to match the resolveClass in readClassDescriptor.
+     *
      * <p>Note that this method will only be called if the ObjectOutputStream
      * is not using the old serialization stream format (set by calling
      * ObjectOutputStream's <code>useProtocolVersion</code> method).  If this
@@ -665,7 +711,14 @@ public class ObjectOutputStream
     protected void writeClassDescriptor(ObjectStreamClass desc)
         throws IOException
     {
-        desc.writeNonProxy(this);
+        if (useFastSerializer) {
+            writeUTF(desc.getName());
+            // The annotateClass is used to match the resolveClass called in
+            // readClassDescriptor.
+            annotateClass(desc.forClass());
+        } else {
+            desc.writeNonProxy(this);
+        }
     }
 
     /**
@@ -1275,9 +1328,21 @@ public class ObjectOutputStream
         bout.writeByte(TC_CLASSDESC);
         handles.assign(unshared ? null : desc);
 
+        if (Logging.fastSerLogger != null) {
+            Logging.fastSerLogger.fine(
+            "[Serialize]   useFastSerializer:{0}, Class name:{1}, SerialVersionUID:{2}, flags:{3}, protocol:{4}",
+            useFastSerializer, desc.getName(), desc.getSerialVersionUID(), desc.getFlags(this), protocol);
+        }
+
         if (protocol == PROTOCOL_VERSION_1) {
             // do not invoke class descriptor write hook with old protocol
-            desc.writeNonProxy(this);
+            if (useFastSerializer) {
+                // only write name and annotate class when using FastSerializer
+                writeUTF(desc.getName());
+                annotateClass(desc.forClass());
+            } else {
+                desc.writeNonProxy(this);
+            }
         } else {
             writeClassDescriptor(desc);
         }
@@ -1291,7 +1356,9 @@ public class ObjectOutputStream
         bout.setBlockDataMode(false);
         bout.writeByte(TC_ENDBLOCKDATA);
 
-        writeClassDesc(desc.getSuperDesc(), false);
+        if (!useFastSerializer) {
+            writeClassDesc(desc.getSuperDesc(), false);
+        }
     }
 
     /**
diff --git a/jdk/src/share/classes/java/io/ObjectStreamClass.java b/jdk/src/share/classes/java/io/ObjectStreamClass.java
index 64453b25a..fce3c3475 100644
--- a/jdk/src/share/classes/java/io/ObjectStreamClass.java
+++ b/jdk/src/share/classes/java/io/ObjectStreamClass.java
@@ -280,6 +280,40 @@ public class ObjectStreamClass implements Serializable {
         return suid.longValue();
     }
 
+    /**
+     * Return the flags for this class described by this descriptor. The flags
+     * means a set of bit masks for ObjectStreamClass, which indicate the status
+     * of SC_WRITE_METHOD, SC_SERIALIZABLE, SC_EXTERNALIZABLE, SC_BLOCK_DATA and
+     * SC_ENUM.
+     *
+     * @param serialStream ObjectOutputStream or ObjectInputStream
+     *
+     * @return the flags for this class described by this descriptor
+     */
+    byte getFlags(Object serialStream) {
+        byte flags = 0;
+        if (externalizable) {
+            flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
+            if (serialStream instanceof ObjectOutputStream) {
+                int protocol = ((ObjectOutputStream)serialStream).getProtocolVersion();
+                if (protocol != ObjectStreamConstants.PROTOCOL_VERSION_1) {
+                    flags |= ObjectStreamConstants.SC_BLOCK_DATA;
+                }
+            } else if (serialStream instanceof ObjectInputStream) {
+                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;
+        }
+        return flags;
+    }
+
     /**
      * Return the class in the local VM that this version is mapped to.  Null
      * is returned if there is no corresponding local class.
@@ -570,6 +604,15 @@ public class ObjectStreamClass implements Serializable {
     ObjectStreamClass() {
     }
 
+    /**
+     * Create a blank class descriptor with name. It is only used
+     * in fastSerialize path.
+     * @param name  class name
+     */
+    ObjectStreamClass(String name) {
+        this.name  = name;
+    }
+
     /**
      * Creates a PermissionDomain that grants no permission.
      */
@@ -756,6 +799,44 @@ public class ObjectStreamClass implements Serializable {
         initialized = true;
     }
 
+    /**
+     * Initializes class descriptor representing a non-proxy class.
+     * Used in fast serialization mode.
+     */
+    void initNonProxyFast(ObjectStreamClass model,
+                          ClassNotFoundException resolveEx)
+    {
+        this.cl = model.cl;
+        this.resolveEx = resolveEx;
+        this.superDesc = model.superDesc;
+        name = model.name;
+        this.suid = model.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;
+
+        writeObjectMethod = model.writeObjectMethod;
+        readObjectMethod = model.readObjectMethod;
+        readObjectNoDataMethod = model.readObjectNoDataMethod;
+        writeReplaceMethod = model.writeReplaceMethod;
+        readResolveMethod = model.readResolveMethod;
+        if (deserializeEx == null) {
+            deserializeEx = model.deserializeEx;
+        }
+        domains = model.domains;
+        cons = model.cons;
+        fieldRefl = model.fieldRefl;
+        localDesc = model;
+
+        initialized = true;
+    }
+
     /**
      * Reads non-proxy class descriptor information from given input stream.
      * The resulting class descriptor is not fully functional; it can only be
diff --git a/jdk/src/share/classes/sun/misc/Unsafe.java b/jdk/src/share/classes/sun/misc/Unsafe.java
index 99e465802..92fb01669 100644
--- a/jdk/src/share/classes/sun/misc/Unsafe.java
+++ b/jdk/src/share/classes/sun/misc/Unsafe.java
@@ -433,6 +433,8 @@ public final class Unsafe {
     /** @see #putByte(long, byte) */
     public native void    putDouble(long address, double x);
 
+    public native boolean getUseFastSerializer();
+
     /**
      * Fetches a native pointer from a given memory address.  If the address is
      * zero, or does not point into a block obtained from {@link