--- /dev/null	2018-11-26 11:49:18.255023023 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.inline.hpp	2018-11-26 21:29:56.859163180 +0100
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_INLINE_HPP
+#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_INLINE_HPP
+
+#include "gc/shenandoah/shenandoahCollectionSet.hpp"
+#include "gc/shenandoah/shenandoahHeap.hpp"
+#include "gc/shenandoah/shenandoahHeap.inline.hpp"
+#include "gc/shenandoah/shenandoahHeapRegion.hpp"
+
+bool ShenandoahCollectionSet::is_in(size_t region_number) const {
+  assert(region_number < _heap->num_regions(), "Sanity");
+  return _cset_map[region_number] == 1;
+}
+
+bool ShenandoahCollectionSet::is_in(ShenandoahHeapRegion* r) const {
+  return is_in(r->region_number());
+}
+
+bool ShenandoahCollectionSet::is_in(HeapWord* p) const {
+  assert(_heap->is_in(p), "Must be in the heap");
+  uintx index = ((uintx) p) >> _region_size_bytes_shift;
+  // no need to subtract the bottom of the heap from p,
+  // _biased_cset_map is biased
+  return _biased_cset_map[index] == 1;
+}
+
+#endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHCOLLECTIONSET_INLINE_HPP