--- /dev/null	2019-01-28 17:45:48.000000000 +0800
+++ new/src/share/vm/jfr/leakprofiler/chains/bitset.hpp	2019-01-28 17:45:48.000000000 +0800
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2014, 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.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_LEAKPROFILER_CHAINS_BITSET_HPP
+#define SHARE_VM_JFR_LEAKPROFILER_CHAINS_BITSET_HPP
+
+#include "memory/allocation.hpp"
+#include "oops/oopsHierarchy.hpp"
+#include "utilities/bitMap.inline.hpp"
+
+class JfrVirtualMemory;
+class MemRegion;
+
+class BitSet : public CHeapObj<mtTracing> {
+ private:
+  JfrVirtualMemory* _vmm;
+  const HeapWord* const _region_start;
+  BitMapView _bits;
+  const size_t _region_size;
+
+ public:
+  BitSet(const MemRegion& covered_region);
+  ~BitSet();
+
+  bool initialize();
+
+  BitMap::idx_t mark_obj(const HeapWord* addr) {
+    const BitMap::idx_t bit = addr_to_bit(addr);
+    _bits.par_set_bit(bit);
+    return bit;
+  }
+
+  BitMap::idx_t mark_obj(oop obj) {
+    return mark_obj((HeapWord*)obj);
+  }
+
+  bool is_marked(const HeapWord* addr) const {
+    return is_marked(addr_to_bit(addr));
+  }
+
+  bool is_marked(oop obj) const {
+    return is_marked((HeapWord*)obj);
+  }
+
+  BitMap::idx_t size() const {
+    return _bits.size();
+  }
+
+  BitMap::idx_t addr_to_bit(const HeapWord* addr) const {
+    return pointer_delta(addr, _region_start) >> LogMinObjAlignment;
+  }
+
+  bool is_marked(const BitMap::idx_t bit) const {
+    return _bits.at(bit);
+  }
+};
+
+#endif  // SHARE_VM_JFR_LEAKPROFILER_CHAINS_BITSET_HPP