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/instanceKlass.hpp"
33 #include "oops/symbol.hpp"
34 #include "runtime/atomic.hpp"
35 #include "utilities/checkedCast.hpp"
36
37 inline Symbol* FieldInfo::name(ConstantPool* cp) const {
38 int index = _name_index;
39 if (_field_flags.is_injected()) {
40 return lookup_symbol(index);
41 }
42 return cp->symbol_at(index);
43 }
44
45 inline Symbol* FieldInfo::signature(ConstantPool* cp) const {
46 int index = _signature_index;
47 if (_field_flags.is_injected()) {
48 return lookup_symbol(index);
49 }
50 return cp->symbol_at(index);
51 }
52
53 inline Symbol* FieldInfo::lookup_symbol(int symbol_index) const {
54 assert(_field_flags.is_injected(), "only injected fields");
55 return Symbol::vm_symbol_at(static_cast<vmSymbolID>(symbol_index));
56 }
57
58 inline int FieldInfoStream::num_injected_java_fields(const Array<u1>* fis) {
59 FieldInfoReader fir(fis);
60 fir.skip(1);
61 return fir.next_uint();
62 }
63
64 inline int FieldInfoStream::num_total_fields(const Array<u1>* fis) {
65 FieldInfoReader fir(fis);
66 return fir.next_uint() + fir.next_uint();
67 }
68
69 inline int FieldInfoStream::num_java_fields(const Array<u1>* fis) { return FieldInfoReader(fis).next_uint(); }
70
71 template<typename CON>
72 inline void Mapper<CON>::map_field_info(const FieldInfo& fi) {
73 _next_index++; // pre-increment
74 _consumer->accept_uint(fi.name_index());
75 _consumer->accept_uint(fi.signature_index());
76 _consumer->accept_uint(fi.offset());
77 _consumer->accept_uint(fi.access_flags().as_int());
78 _consumer->accept_uint(fi.field_flags().as_uint());
79 if(fi.field_flags().has_any_optionals()) {
80 if (fi.field_flags().is_initialized()) {
81 _consumer->accept_uint(fi.initializer_index());
82 }
83 if (fi.field_flags().is_generic()) {
84 _consumer->accept_uint(fi.generic_signature_index());
85 }
86 if (fi.field_flags().is_contended()) {
87 _consumer->accept_uint(fi.contention_group());
88 }
89 if (fi.field_flags().is_flat()) {
90 assert(fi.layout_kind() != LayoutKind::UNKNOWN, "Must be set");
91 _consumer->accept_uint(fi.layout_kind());
92 }
93 if (fi.field_flags().has_null_marker()) {
94 _consumer->accept_uint(fi.null_marker_offset());
95 }
96 } else {
97 assert(fi.initializer_index() == 0, "");
98 assert(fi.generic_signature_index() == 0, "");
99 assert(fi.contention_group() == 0, "");
100 assert(fi.null_marker_offset() == 0, "");
101 }
102 }
103
104
105 inline FieldInfoReader::FieldInfoReader(const Array<u1>* fi)
106 : _r(fi->data(), 0),
107 _next_index(0) { }
108
109 inline void FieldInfoReader::read_field_info(FieldInfo& fi) {
110 fi._index = _next_index++;
111 fi._name_index = checked_cast<u2>(next_uint());
112 fi._signature_index = checked_cast<u2>(next_uint());
113 fi._offset = next_uint();
114 fi._access_flags = AccessFlags(next_uint());
115 fi._field_flags = FieldInfo::FieldFlags(next_uint());
116 if (fi._field_flags.is_initialized()) {
117 fi._initializer_index = checked_cast<u2>(next_uint());
118 } else {
119 fi._initializer_index = 0;
120 }
121 if (fi._field_flags.is_generic()) {
122 fi._generic_signature_index = checked_cast<u2>(next_uint());
123 } else {
124 fi._generic_signature_index = 0;
125 }
126 if (fi._field_flags.is_contended()) {
127 fi._contention_group = checked_cast<u2>(next_uint());
128 } else {
129 fi._contention_group = 0;
130 }
131 if (fi._field_flags.is_flat()) {
132 fi._layout_kind = static_cast<LayoutKind>(next_uint());
133 }
134 if (fi._field_flags.has_null_marker()) {
135 fi._null_marker_offset = next_uint();
136 } else {
137 fi._null_marker_offset = 0;
138 }
139 }
140
141 inline FieldInfoReader& FieldInfoReader::skip_field_info() {
142 _next_index++;
143 const int name_sig_af_off = 4; // four items
144 skip(name_sig_af_off);
145 FieldInfo::FieldFlags ff(next_uint());
146 if (ff.has_any_optionals()) {
147 const int init_gen_cont = (ff.is_initialized() +
148 ff.is_generic() +
149 ff.is_contended() +
150 ff.is_flat() +
151 ff.has_null_marker());
152 skip(init_gen_cont); // up to three items
153 }
154 return *this;
155 }
156
157 // Skip to the nth field. If the reader is freshly initialized to
158 // the zero index, this will call skip_field_info() n times.
159 inline FieldInfoReader& FieldInfoReader::skip_to_field_info(int n) {
160 assert(n >= _next_index, "already past that index");
161 const int count = n - _next_index;
162 for (int i = 0; i < count; i++) skip_field_info();
163 assert(_next_index == n, "");
164 return *this;
165 }
166
167 // for random access, if you know where to go up front:
168 inline FieldInfoReader& FieldInfoReader::set_position_and_next_index(int position, int next_index) {
169 _r.set_position(position);
170 _next_index = next_index;
171 return *this;
172 }
173
174 inline void FieldStatus::atomic_set_bits(u1& flags, u1 mask) {
175 Atomic::fetch_then_or(&flags, mask);
176 }
177
178 inline void FieldStatus::atomic_clear_bits(u1& flags, u1 mask) {
179 Atomic::fetch_then_and(&flags, (u1)(~mask));
180 }
181
182 inline void FieldStatus::update_flag(FieldStatusBitPosition pos, bool z) {
183 if (z) atomic_set_bits(_flags, flag_mask(pos));
184 else atomic_clear_bits(_flags, flag_mask(pos));
185 }
186
187 inline void FieldStatus::update_access_watched(bool z) { update_flag(_fs_access_watched, z); }
188 inline void FieldStatus::update_modification_watched(bool z) { update_flag(_fs_modification_watched, z); }
189 inline void FieldStatus::update_initialized_final_update(bool z) { update_flag(_initialized_final_update, z); }
190
191 #endif // SHARE_OOPS_FIELDINFO_INLINE_HPP