--- /dev/null	2019-08-13 13:41:29.860155506 -0400
+++ new/src/hotspot/share/gc/g1/g1BufferNodeList.cpp	2019-08-26 18:55:21.756251905 -0400
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 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.
+ *
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1BufferNodeList.hpp"
+#include "utilities/debug.hpp"
+
+G1BufferNodeList::G1BufferNodeList() :
+  _head(NULL), _tail(NULL), _entry_count(0) {}
+
+G1BufferNodeList::G1BufferNodeList(BufferNode* head,
+                                   BufferNode* tail,
+                                   size_t entry_count) :
+  _head(head), _tail(tail), _entry_count(entry_count)
+{
+  assert((_head == NULL) == (_tail == NULL), "invariant");
+  assert((_head == NULL) == (_entry_count == 0), "invariant");
+}