1 /*
2 * Copyright (c) 2017, 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 #ifndef SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP
25 #define SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP
26
27 #include "gc/z/zBitField.hpp"
28 #include "memory/allocation.hpp"
29
30 //
31 // NMethod table entry layout
32 // --------------------------
33 //
34 // 6
35 // 3 3 2 1 0
36 // +--------------------------------------------------------------------+-+-+-+
37 // |11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111|1|1|1|
38 // +--------------------------------------------------------------------+-+-+-+
39 // | | | |
40 // | 2-2 Non-immediate Oops Flag (1-bits) * | |
41 // | | |
42 // | 1-1 Immediate Oops/Unregistered Flag (1-bits) * |
43 // | |
44 // | 0-0 Registered Flag (1-bits) *
45 // |
46 // * 63-3 NMethod/ZNMethodWithImmediateOops Address (61-bits)
47 //
48
49 class nmethod;
50 class ZNMethodWithImmediateOops;
51
52 class ZNMethodTableEntry : public CHeapObj<mtGC> {
53 private:
54 typedef ZBitField<uint64_t, bool, 0, 1> field_registered;
55 typedef ZBitField<uint64_t, bool, 1, 1> field_unregistered;
56 typedef ZBitField<uint64_t, bool, 1, 1> field_immediate_oops;
57 typedef ZBitField<uint64_t, bool, 2, 1> field_non_immediate_oops;
58 typedef ZBitField<uint64_t, nmethod*, 3, 61, 3> field_method;
59 typedef ZBitField<uint64_t, ZNMethodWithImmediateOops*, 3, 61, 3> field_method_with_immediate_oops;
60
61 uint64_t _entry;
62
63 public:
64 ZNMethodTableEntry(bool unregistered = false) :
65 _entry(field_unregistered::encode(unregistered) |
66 field_registered::encode(false)) {}
67
68 ZNMethodTableEntry(nmethod* method, bool non_immediate_oops) :
69 _entry(field_method::encode(method) |
70 field_non_immediate_oops::encode(non_immediate_oops) |
71 field_immediate_oops::encode(false) |
72 field_registered::encode(true)) {}
73
74 ZNMethodTableEntry(ZNMethodWithImmediateOops* method_with_immediate_oops, bool non_immediate_oops) :
75 _entry(field_method_with_immediate_oops::encode(method_with_immediate_oops) |
76 field_non_immediate_oops::encode(non_immediate_oops) |
77 field_immediate_oops::encode(true) |
78 field_registered::encode(true)) {}
79
80 bool registered() const {
81 return field_registered::decode(_entry);
82 }
83
84 bool unregistered() const {
85 return field_unregistered::decode(_entry);
86 }
87
88 bool immediate_oops() const {
89 return field_immediate_oops::decode(_entry);
90 }
91
92 bool non_immediate_oops() const {
93 return field_non_immediate_oops::decode(_entry);
94 }
95
96 nmethod* method() const {
97 return field_method::decode(_entry);
98 }
99
100 ZNMethodWithImmediateOops* method_with_immediate_oops() const {
101 return field_method_with_immediate_oops::decode(_entry);
102 }
103 };
104
105 #endif // SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP