--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/debugger/linux/LinuxDebugger.java	2019-12-15 10:42:35.520797200 +0900
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/debugger/linux/LinuxDebugger.java	2019-12-15 10:42:34.839459100 +0900
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2008, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 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
@@ -52,6 +52,7 @@
   public long[]       getThreadIntegerRegisterSet(int lwp_id) throws DebuggerException;
   public long         getAddressValue(Address addr) throws DebuggerException;
   public Address      newAddress(long value) throws DebuggerException;
+  public long         findLibPtrByAddress(Address pc);
 
   // For LinuxCDebugger
   public List         getThreadList();