1/*
2 * Copyright (c) 2017, 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
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22 */
23
24#ifndef SHARE_GC_Z_ZALLOCATIONFLAGS_HPP
25#define SHARE_GC_Z_ZALLOCATIONFLAGS_HPP
26
27#include "gc/z/zBitField.hpp"
28#include "memory/allocation.hpp"
29
30//
31// Allocation flags layout
32// -----------------------
33//
34// 7 3 2 1 0
35// +----+-+-+-+-+
36// |0000|1|1|1|1|
37// +----+-+-+-+-+
38// | | | | |
39// | | | | * 0-0 Worker Thread Flag (1-bit)
40// | | | |
41// | | | * 1-1 Non-Blocking Flag (1-bit)
42// | | |
43// | | * 2-2 Relocation Flag (1-bit)
44// | |
45// | * 3-3 No Reserve Flag (1-bit)
46// |
47// * 7-4 Unused (4-bits)
48//
49
50class ZAllocationFlags {
51private:
52 typedef ZBitField<uint8_t, bool, 0, 1> field_worker_thread;
53 typedef ZBitField<uint8_t, bool, 1, 1> field_non_blocking;
54 typedef ZBitField<uint8_t, bool, 2, 1> field_relocation;
55 typedef ZBitField<uint8_t, bool, 3, 1> field_no_reserve;
56
57 uint8_t _flags;
58
59public:
60 ZAllocationFlags() :
61 _flags(0) {}
62
63 void set_worker_thread() {
64 _flags |= field_worker_thread::encode(true);
65 }
66
67 void set_non_blocking() {
68 _flags |= field_non_blocking::encode(true);
69 }
70
71 void set_relocation() {
72 _flags |= field_relocation::encode(true);
73 }
74
75 void set_no_reserve() {
76 _flags |= field_no_reserve::encode(true);
77 }
78
79 bool worker_thread() const {
80 return field_worker_thread::decode(_flags);
81 }
82
83 bool non_blocking() const {
84 return field_non_blocking::decode(_flags);
85 }
86
87 bool relocation() const {
88 return field_relocation::decode(_flags);
89 }
90
91 bool no_reserve() const {
92 return field_no_reserve::decode(_flags);
93 }
94};
95
96#endif // SHARE_GC_Z_ZALLOCATIONFLAGS_HPP
97