1 /*
2 * Copyright (c) 1997, 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 #include "precompiled.hpp"
26 #include "classfile/vmSymbols.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "oops/annotations.hpp"
29 #include "oops/constantPool.hpp"
30 #include "oops/instanceKlass.hpp"
31 #include "oops/klass.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "oops/fieldStreams.inline.hpp"
34 #include "runtime/fieldDescriptor.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/signature.hpp"
37
38 Symbol* fieldDescriptor::generic_signature() const {
39 if (!has_generic_signature()) {
40 return nullptr;
41 }
42 return _cp->symbol_at(_fieldinfo.generic_signature_index());
43 }
44
45 bool fieldDescriptor::is_trusted_final() const {
46 InstanceKlass* ik = field_holder();
47 return is_final() && (is_static() || ik->is_hidden() || ik->is_record());
48 }
49
50 AnnotationArray* fieldDescriptor::annotations() const {
51 InstanceKlass* ik = field_holder();
52 Array<AnnotationArray*>* md = ik->fields_annotations();
53 if (md == nullptr)
54 return nullptr;
55 return md->at(index());
56 }
57
58 AnnotationArray* fieldDescriptor::type_annotations() const {
59 InstanceKlass* ik = field_holder();
60 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
61 if (type_annos == nullptr)
62 return nullptr;
63 return type_annos->at(index());
64 }
65
66 constantTag fieldDescriptor::initial_value_tag() const {
67 return constants()->tag_at(initial_value_index());
68 }
69
70 jint fieldDescriptor::int_initial_value() const {
71 return constants()->int_at(initial_value_index());
72 }
73
74 jlong fieldDescriptor::long_initial_value() const {
75 return constants()->long_at(initial_value_index());
76 }
77
78 jfloat fieldDescriptor::float_initial_value() const {
79 return constants()->float_at(initial_value_index());
80 }
81
82 jdouble fieldDescriptor::double_initial_value() const {
83 return constants()->double_at(initial_value_index());
84 }
85
86 oop fieldDescriptor::string_initial_value(TRAPS) const {
87 return constants()->uncached_string_at(initial_value_index(), THREAD);
88 }
89
90 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
91 if (_cp.is_null() || field_holder() != ik) {
92 _cp = constantPoolHandle(Thread::current(), ik->constants());
93 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
94 // If the class is a scratch class, the constant pool points to the original class,
95 // but that's ok because of constant pool merging.
96 assert(field_holder() == ik || ik->is_scratch_class(), "must be already initialized to this class");
97 }
98 _fieldinfo= ik->field(index);
99 assert((int)_fieldinfo.index() == index, "just checking");
100 guarantee(_fieldinfo.name_index() != 0 && _fieldinfo.signature_index() != 0, "bad constant pool index for fieldDescriptor");
101 }
102
103 void fieldDescriptor::print_on(outputStream* st) const {
104 access_flags().print_on(st);
105 if (field_flags().is_injected()) st->print("injected ");
106 name()->print_value_on(st);
107 st->print(" ");
108 signature()->print_value_on(st);
109 st->print(" @%d ", offset());
110 if (WizardMode && has_initial_value()) {
111 st->print("(initval ");
112 constantTag t = initial_value_tag();
113 if (t.is_int()) {
114 st->print("int %d)", int_initial_value());
115 } else if (t.is_long()){
116 st->print_jlong(long_initial_value());
117 } else if (t.is_float()){
118 st->print("float %f)", float_initial_value());
119 } else if (t.is_double()){
120 st->print("double %lf)", double_initial_value());
121 }
122 }
123 }
124
125 void fieldDescriptor::print() const { print_on(tty); }
126
127 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
128 print_on(st);
129 st->print(" ");
130
131 BasicType ft = field_type();
132 switch (ft) {
133 case T_BYTE:
134 st->print("%d", obj->byte_field(offset()));
135 break;
136 case T_CHAR:
137 {
138 jchar c = obj->char_field(offset());
139 st->print("%c %d", isprint(c) ? c : ' ', c);
140 }
141 break;
142 case T_DOUBLE:
143 st->print("%lf", obj->double_field(offset()));
144 break;
145 case T_FLOAT:
146 st->print("%f", obj->float_field(offset()));
147 break;
148 case T_INT:
149 st->print("%d", obj->int_field(offset()));
150 break;
151 case T_LONG:
152 st->print_jlong(obj->long_field(offset()));
153 break;
154 case T_SHORT:
155 st->print("%d", obj->short_field(offset()));
156 break;
157 case T_BOOLEAN:
158 st->print("%s", obj->bool_field(offset()) ? "true" : "false");
159 break;
160 case T_ARRAY:
161 if (obj->obj_field(offset()) != nullptr) {
162 obj->obj_field(offset())->print_value_on(st);
163 } else {
164 st->print("null");
165 }
166 break;
167 case T_OBJECT:
168 if (obj->obj_field(offset()) != nullptr) {
169 obj->obj_field(offset())->print_value_on(st);
170 } else {
171 st->print("null");
172 }
173 break;
174 default:
175 ShouldNotReachHere();
176 break;
177 }
178
179 // Print a hint as to the underlying integer representation.
180 if (is_reference_type(ft)) {
181 #ifdef _LP64
182 if (UseCompressedOops) {
183 st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
184 } else {
185 st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset()));
186 }
187 #else
188 st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
189 #endif
190 } else { // Primitives
191 switch (ft) {
192 case T_LONG: st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
193 case T_DOUBLE: st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
194 case T_BYTE: st->print(" (" INT8_FORMAT_X_0 ")", obj->byte_field(offset())); break;
195 case T_CHAR: st->print(" (" INT16_FORMAT_X_0 ")", obj->char_field(offset())); break;
196 case T_FLOAT: st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset())); break;
197 case T_INT: st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset())); break;
198 case T_SHORT: st->print(" (" INT16_FORMAT_X_0 ")", obj->short_field(offset())); break;
199 case T_BOOLEAN: st->print(" (" INT8_FORMAT_X_0 ")", obj->bool_field(offset())); break;
200 default:
201 ShouldNotReachHere();
202 break;
203 }
204 }
205 }