1/*
2 * Copyright (c) 2017, 2019, 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
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23 */
24
25#ifndef SHARE_JFR_LEAKPROFILER_UTILITIES_UNIFIEDOOP_HPP
26#define SHARE_JFR_LEAKPROFILER_UTILITIES_UNIFIEDOOP_HPP
27
28#include "oops/oop.inline.hpp"
29
30class UnifiedOop : public AllStatic {
31 public:
32 static const bool is_narrow(const oop* ref) {
33 assert(ref != NULL, "invariant");
34 return 1 == (((u8)ref) & 1);
35 }
36
37 static const oop* decode(const oop* ref) {
38 assert(ref != NULL, "invariant");
39 return is_narrow(ref) ? (const oop*)(((u8)ref) & ~1) : ref;
40 }
41
42 static const oop* encode(narrowOop* ref) {
43 assert(ref != NULL, "invariant");
44 return (const oop*)((u8)ref | 1);
45 }
46
47 static oop dereference(const oop* ref) {
48 assert(ref != NULL, "invariant");
49 return is_narrow(ref) ?
50 (oop)RawAccess<>::oop_load((narrowOop*)decode(ref)) :
51 (oop)RawAccess<>::oop_load(const_cast<oop*>(ref));
52
53 }
54};
55
56#endif // SHARE_JFR_LEAKPROFILER_UTILITIES_UNIFIEDOOP_HPP
57