--- /dev/null	2020-03-11 18:39:32.786759700 +0900
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/debugger/linux/amd64/DwarfParser.java	2020-03-11 18:43:52.904564800 +0900
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, NTT DATA.
+ * 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.
+ *
+ * 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 sun.jvm.hotspot.debugger.linux.amd64;
+
+import java.lang.ref.Cleaner;
+import sun.jvm.hotspot.debugger.Address;
+import sun.jvm.hotspot.debugger.DebuggerException;
+
+public class DwarfParser {
+  private final long p_dwarf_context; // native dwarf context handle
+
+  private static native void init0();
+  private static native long createDwarfContext(long lib);
+  private static native void destroyDwarfContext(long context);
+  private native boolean isIn0(long pc);
+
+  static {
+    init0();
+  }
+
+  public DwarfParser(Address lib) {
+    p_dwarf_context = createDwarfContext(lib.asLongValue());
+
+    if (p_dwarf_context == 0L) {
+      throw new DebuggerException("Could not create DWARF context");
+    }
+
+    Cleaner.create()
+           .register(this, () -> DwarfParser.destroyDwarfContext(p_dwarf_context));
+  }
+
+  public boolean isIn(Address pc) {
+    return isIn0(pc.asLongValue());
+  }
+
+  private native void processDwarf0(long pc);
+
+  public void processDwarf(Address pc) {
+    processDwarf0(pc.asLongValue());
+  }
+
+  public native int getCFARegister();
+  public native int getCFAOffset();
+  public native int getReturnAddressOffsetFromCFA();
+  public native int getBasePointerOffsetFromCFA();
+  public native boolean isBPOffsetAvailable();
+}