--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/locationPrinter.cpp	Wed Aug 28 11:19:09 2019 +0200
@@ -0,0 +1,50 @@
+/*
+ * 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/shared/collectedHeap.hpp"
+#include "gc/shared/locationPrinter.hpp"
+#include "memory/universe.hpp"
+#include "runtime/os.hpp"
+#include "oops/klass.hpp"
+
+bool LocationPrinter::is_valid_obj(void* obj) {
+  if (!is_object_aligned(obj)) {
+    return false;
+  }
+  if (obj < (void*)os::min_page_size()) {
+    return false;
+  }
+
+  // We need at least the mark and the klass word in the committed region.
+  if (!os::is_readable_range(obj, (HeapWord*)obj + oopDesc::header_size())) {
+    return false;
+  }
+  if (!Universe::heap()->is_in(obj)) {
+    return false;
+  }
+
+  Klass* k = (Klass*)oopDesc::load_klass_raw((oopDesc*)obj);
+  return Klass::is_valid(k);
+}