--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/src/share/classes/jdk/jfr/internal/PrivateAccess.java	2019-01-29 10:59:39.711554541 +0800
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.internal;
+
+import java.util.List;
+import java.util.Map;
+
+import jdk.jfr.AnnotationElement;
+import jdk.jfr.Configuration;
+import jdk.jfr.EventType;
+import jdk.jfr.FlightRecorderPermission;
+import jdk.jfr.Recording;
+import jdk.jfr.SettingDescriptor;
+import jdk.jfr.ValueDescriptor;
+
+/**
+ * Provides access to package private function in jdk.jfr.
+ * <p>
+ * The static initializer in this class loads the Settings class, which will
+ * call {@link #setPrivateAccess(PrivateAccess)} on this class, which can be
+ * used call to package protected methods.
+ *
+ * This is similar to how java.lang accesses package private methods in
+ * java.lang.reflect.
+ */
+public abstract class PrivateAccess {
+    private volatile static PrivateAccess instance;
+
+    public static PrivateAccess getInstance() {
+        // Can't be initialized in <clinit> because it may
+        // deadlock with FlightRecordeerPermission.<clinit>
+        if (instance == null) {
+            // Will trigger
+            // FlightRecordeerPermission.<clinit>
+            // which will call PrivateAccess.setPrivateAccess
+            new FlightRecorderPermission(Utils.REGISTER_EVENT);
+        }
+        return instance;
+    }
+
+    public static void setPrivateAccess(PrivateAccess pa) {
+        instance = pa;
+    }
+
+    public abstract Type getType(Object o);
+
+    public abstract Configuration newConfiguration(String name, String label, String description, String provider, Map<String,String> settings, String contents);
+
+    public abstract EventType newEventType(PlatformEventType eventTypes);
+
+    public abstract AnnotationElement newAnnotation(Type annotationType, List<Object> values, boolean boot);
+
+    public abstract ValueDescriptor newValueDescriptor(String name, Type fieldType, List<AnnotationElement> annotations, int dimension, boolean constantPool, String fieldName);
+
+    public abstract PlatformRecording getPlatformRecording(Recording r);
+
+    public abstract PlatformEventType getPlatformEventType(EventType eventType);
+
+    public abstract boolean isConstantPool(ValueDescriptor v);
+
+    public abstract String getFieldName(ValueDescriptor v);
+
+    public abstract ValueDescriptor newValueDescriptor(Class<?> type, String name);
+
+    public abstract SettingDescriptor newSettingDescriptor(Type type, String name, String def, List<AnnotationElement> aes);
+
+    public abstract void setAnnotations(ValueDescriptor v, List<AnnotationElement> a);
+
+    public abstract void setAnnotations(SettingDescriptor s, List<AnnotationElement> a);
+
+    public abstract boolean isUnsigned(ValueDescriptor v);
+}