1/*
2 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24#include "precompiled.hpp"
25#include "jfr/leakprofiler/chains/bitset.hpp"
26#include "jfr/recorder/storage/jfrVirtualMemory.hpp"
27#include "memory/memRegion.hpp"
28
29BitSet::BitSet(const MemRegion& covered_region) :
30 _vmm(NULL),
31 _region_start(covered_region.start()),
32 _region_size(covered_region.word_size()) {
33}
34
35BitSet::~BitSet() {
36 delete _vmm;
37}
38
39bool BitSet::initialize() {
40 assert(_vmm == NULL, "invariant");
41 _vmm = new JfrVirtualMemory();
42 if (_vmm == NULL) {
43 return false;
44 }
45
46 const BitMap::idx_t bits = _region_size >> LogMinObjAlignment;
47 const size_t words = bits / BitsPerWord;
48 const size_t raw_bytes = words * sizeof(BitMap::idx_t);
49
50 // the virtual memory invocation will reserve and commit the entire space
51 BitMap::bm_word_t* map = (BitMap::bm_word_t*)_vmm->initialize(raw_bytes, raw_bytes);
52 if (map == NULL) {
53 return false;
54 }
55 _bits = BitMapView(map, bits);
56 return true;
57}
58
59