1 /*
2 * Copyright (c) 2023, 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
25 #ifndef SHARE_OOPS_FIELDINFO_INLINE_HPP
26 #define SHARE_OOPS_FIELDINFO_INLINE_HPP
27
28 #include "oops/fieldInfo.hpp"
29
30 #include "memory/metadataFactory.hpp"
31 #include "oops/constantPool.hpp"
32 #include "oops/symbol.hpp"
33 #include "runtime/atomic.hpp"
34 #include "utilities/checkedCast.hpp"
35
36 inline Symbol* FieldInfo::name(ConstantPool* cp) const {
37 int index = _name_index;
38 if (_field_flags.is_injected()) {
39 return lookup_symbol(index);
40 }
41 return cp->symbol_at(index);
42 }
43
44 inline Symbol* FieldInfo::signature(ConstantPool* cp) const {
45 int index = _signature_index;
46 if (_field_flags.is_injected()) {
47 return lookup_symbol(index);
48 }
49 return cp->symbol_at(index);
50 }
51
52 inline Symbol* FieldInfo::lookup_symbol(int symbol_index) const {
53 assert(_field_flags.is_injected(), "only injected fields");
54 return Symbol::vm_symbol_at(static_cast<vmSymbolID>(symbol_index));
55 }
56
57 inline int FieldInfoStream::num_injected_java_fields(const Array<u1>* fis) {
58 FieldInfoReader fir(fis);
59 fir.skip(1);
60 return fir.next_uint();
61 }
62
63 inline int FieldInfoStream::num_total_fields(const Array<u1>* fis) {
64 FieldInfoReader fir(fis);
65 return fir.next_uint() + fir.next_uint();
66 }
67
68 inline int FieldInfoStream::num_java_fields(const Array<u1>* fis) { return FieldInfoReader(fis).next_uint(); }
69
70 template<typename CON>
71 inline void Mapper<CON>::map_field_info(const FieldInfo& fi) {
72 _next_index++; // pre-increment
73 _consumer->accept_uint(fi.name_index());
74 _consumer->accept_uint(fi.signature_index());
75 _consumer->accept_uint(fi.offset());
76 _consumer->accept_uint(fi.access_flags().as_int());
77 _consumer->accept_uint(fi.field_flags().as_uint());
78 if(fi.field_flags().has_any_optionals()) {
79 if (fi.field_flags().is_initialized()) {
80 _consumer->accept_uint(fi.initializer_index());
81 }
82 if (fi.field_flags().is_generic()) {
83 _consumer->accept_uint(fi.generic_signature_index());
84 }
85 if (fi.field_flags().is_contended()) {
86 _consumer->accept_uint(fi.contention_group());
87 }
88 } else {
89 assert(fi.initializer_index() == 0, "");
90 assert(fi.generic_signature_index() == 0, "");
91 assert(fi.contention_group() == 0, "");
92 }
93 }
94
95
96 inline FieldInfoReader::FieldInfoReader(const Array<u1>* fi)
97 : _r(fi->data(), 0),
98 _next_index(0) { }
99
100 inline void FieldInfoReader::read_field_info(FieldInfo& fi) {
101 fi._index = _next_index++;
102 fi._name_index = checked_cast<u2>(next_uint());
103 fi._signature_index = checked_cast<u2>(next_uint());
104 fi._offset = next_uint();
105 fi._access_flags = AccessFlags(next_uint());
106 fi._field_flags = FieldInfo::FieldFlags(next_uint());
107 if (fi._field_flags.is_initialized()) {
108 fi._initializer_index = checked_cast<u2>(next_uint());
109 } else {
110 fi._initializer_index = 0;
111 }
112 if (fi._field_flags.is_generic()) {
113 fi._generic_signature_index = checked_cast<u2>(next_uint());
114 } else {
115 fi._generic_signature_index = 0;
116 }
117 if (fi._field_flags.is_contended()) {
118 fi._contention_group = checked_cast<u2>(next_uint());
119 } else {
120 fi._contention_group = 0;
121 }
122 }
123
124 inline FieldInfoReader& FieldInfoReader::skip_field_info() {
125 _next_index++;
126 const int name_sig_af_off = 4; // four items
127 skip(name_sig_af_off);
128 FieldInfo::FieldFlags ff(next_uint());
129 if (ff.has_any_optionals()) {
130 const int init_gen_cont = (ff.is_initialized() +
131 ff.is_generic() +
132 ff.is_contended());
133 skip(init_gen_cont); // up to three items
134 }
135 return *this;
136 }
137
138 // Skip to the nth field. If the reader is freshly initialized to
139 // the zero index, this will call skip_field_info() n times.
140 inline FieldInfoReader& FieldInfoReader::skip_to_field_info(int n) {
141 assert(n >= _next_index, "already past that index");
142 const int count = n - _next_index;
143 for (int i = 0; i < count; i++) skip_field_info();
144 assert(_next_index == n, "");
145 return *this;
146 }
147
148 // for random access, if you know where to go up front:
149 inline FieldInfoReader& FieldInfoReader::set_position_and_next_index(int position, int next_index) {
150 _r.set_position(position);
151 _next_index = next_index;
152 return *this;
153 }
154
155 inline void FieldStatus::atomic_set_bits(u1& flags, u1 mask) {
156 Atomic::fetch_then_or(&flags, mask);
157 }
158
159 inline void FieldStatus::atomic_clear_bits(u1& flags, u1 mask) {
160 Atomic::fetch_then_and(&flags, (u1)(~mask));
161 }
162
163 inline void FieldStatus::update_flag(FieldStatusBitPosition pos, bool z) {
164 if (z) atomic_set_bits(_flags, flag_mask(pos));
165 else atomic_clear_bits(_flags, flag_mask(pos));
166 }
167
168 inline void FieldStatus::update_access_watched(bool z) { update_flag(_fs_access_watched, z); }
169 inline void FieldStatus::update_modification_watched(bool z) { update_flag(_fs_modification_watched, z); }
170 inline void FieldStatus::update_initialized_final_update(bool z) { update_flag(_initialized_final_update, z); }
171
172 #endif // SHARE_OOPS_FIELDINFO_INLINE_HPP