--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/leakprofiler/chains/bitset.cpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2014, 2018, 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 "jfr/leakprofiler/chains/bitset.hpp"
+#include "jfr/recorder/storage/jfrVirtualMemory.hpp"
+#include "memory/memRegion.hpp"
+
+BitSet::BitSet(const MemRegion& covered_region) :
+  _vmm(NULL),
+  _region_start(covered_region.start()),
+  _region_size(covered_region.word_size()) {
+}
+
+BitSet::~BitSet() {
+  delete _vmm;
+}
+
+bool BitSet::initialize() {
+  assert(_vmm == NULL, "invariant");
+  _vmm = new JfrVirtualMemory();
+  if (_vmm == NULL) {
+    return false;
+  }
+
+  const BitMap::idx_t bits = _region_size >> LogMinObjAlignment;
+  const size_t words = bits / BitsPerWord;
+  const size_t raw_bytes = words * sizeof(BitMap::idx_t);
+
+  // the virtual memory invocation will reserve and commit the entire space
+  BitMap::bm_word_t* map = (BitMap::bm_word_t*)_vmm->initialize(raw_bytes, raw_bytes);
+  if (map == NULL) {
+    return false;
+  }
+  _bits = BitMapView(map, bits);
+  return true;
+}
+