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 "oops/inlineKlass.inline.hpp"
35 #include "runtime/fieldDescriptor.inline.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/signature.hpp"
38
39 Symbol* fieldDescriptor::generic_signature() const {
40 if (!has_generic_signature()) {
41 return nullptr;
42 }
43 return _cp->symbol_at(_fieldinfo.generic_signature_index());
44 }
45
46 bool fieldDescriptor::is_trusted_final() const {
47 InstanceKlass* ik = field_holder();
48 return is_final() && (is_static() || ik->is_hidden() || ik->is_record() || ik->is_inline_klass()
49 || (ik->is_abstract() && !ik->is_identity_class() && !ik->is_interface()));
50 }
51
52 AnnotationArray* fieldDescriptor::annotations() const {
53 InstanceKlass* ik = field_holder();
54 Array<AnnotationArray*>* md = ik->fields_annotations();
55 if (md == nullptr)
56 return nullptr;
57 return md->at(index());
58 }
59
60 AnnotationArray* fieldDescriptor::type_annotations() const {
61 InstanceKlass* ik = field_holder();
62 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
63 if (type_annos == nullptr)
64 return nullptr;
65 return type_annos->at(index());
66 }
67
68 constantTag fieldDescriptor::initial_value_tag() const {
69 return constants()->tag_at(initial_value_index());
70 }
71
72 jint fieldDescriptor::int_initial_value() const {
73 return constants()->int_at(initial_value_index());
74 }
75
76 jlong fieldDescriptor::long_initial_value() const {
77 return constants()->long_at(initial_value_index());
78 }
79
80 jfloat fieldDescriptor::float_initial_value() const {
81 return constants()->float_at(initial_value_index());
82 }
83
84 jdouble fieldDescriptor::double_initial_value() const {
85 return constants()->double_at(initial_value_index());
86 }
87
88 oop fieldDescriptor::string_initial_value(TRAPS) const {
89 return constants()->uncached_string_at(initial_value_index(), THREAD);
90 }
91
92 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
93 if (_cp.is_null() || field_holder() != ik) {
94 _cp = constantPoolHandle(Thread::current(), ik->constants());
95 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
96 // If the class is a scratch class, the constant pool points to the original class,
97 // but that's ok because of constant pool merging.
98 assert(field_holder() == ik || ik->is_scratch_class(), "must be already initialized to this class");
99 }
100 _fieldinfo= ik->field(index);
101 assert((int)_fieldinfo.index() == index, "just checking");
102 guarantee(_fieldinfo.name_index() != 0 && _fieldinfo.signature_index() != 0, "bad constant pool index for fieldDescriptor");
103 }
104
105 void fieldDescriptor::print_on(outputStream* st) const {
106 access_flags().print_on(st);
107 if (field_flags().is_injected()) st->print("injected ");
108 name()->print_value_on(st);
109 st->print(" ");
110 signature()->print_value_on(st);
111 st->print(" @%d ", offset());
112 if (WizardMode && has_initial_value()) {
113 st->print("(initval ");
114 constantTag t = initial_value_tag();
115 if (t.is_int()) {
116 st->print("int %d)", int_initial_value());
117 } else if (t.is_long()){
118 st->print_jlong(long_initial_value());
119 } else if (t.is_float()){
120 st->print("float %f)", float_initial_value());
121 } else if (t.is_double()){
122 st->print("double %lf)", double_initial_value());
123 }
124 }
125 }
126
127 void fieldDescriptor::print() const { print_on(tty); }
128
129 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
130 BasicType ft = field_type();
131 if (!is_null_free_inline_type()) {
132 print_on(st);
133 st->print(" ");
134 }
135 jint as_int = 0;
136 switch (ft) {
137 case T_BYTE:
138 st->print("%d", obj->byte_field(offset()));
139 break;
140 case T_CHAR:
141 {
142 jchar c = obj->char_field(offset());
143 st->print("%c %d", isprint(c) ? c : ' ', c);
144 }
145 break;
146 case T_DOUBLE:
147 st->print("%lf", obj->double_field(offset()));
148 break;
149 case T_FLOAT:
150 st->print("%f", obj->float_field(offset()));
151 break;
152 case T_INT:
153 st->print("%d", obj->int_field(offset()));
154 break;
155 case T_LONG:
156 st->print_jlong(obj->long_field(offset()));
157 break;
158 case T_SHORT:
159 st->print("%d", obj->short_field(offset()));
160 break;
161 case T_BOOLEAN:
162 st->print("%s", obj->bool_field(offset()) ? "true" : "false");
163 break;
164 case T_ARRAY:
165 case T_OBJECT:
166 if (is_flat()) { // only some inline types can be flat
167 assert(is_null_free_inline_type(), "Only null free inline type fields can be flat");
168 // Print fields of flat fields (recursively)
169 InlineKlass* vk = InlineKlass::cast(field_holder()->get_inline_type_field_klass(index()));
170 int field_offset = offset() - vk->first_field_offset();
171 obj = cast_to_oop(cast_from_oop<address>(obj) + field_offset);
172 st->print_cr("Flat inline type field '%s':", vk->name()->as_C_string());
173 FieldPrinter print_field(st, obj);
174 vk->do_nonstatic_fields(&print_field);
175 return; // Do not print underlying representation
176 }
177 // Not flat inline type field, fall through
178 if (obj->obj_field(offset()) != nullptr) {
179 obj->obj_field(offset())->print_value_on(st);
180 } else {
181 st->print("null");
182 }
183 break;
184 default:
185 ShouldNotReachHere();
186 break;
187 }
188
189 // Print a hint as to the underlying integer representation.
190 if (is_reference_type(ft)) {
191 #ifdef _LP64
192 if (UseCompressedOops) {
193 st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
194 } else {
195 st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset()));
196 }
197 #else
198 st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
199 #endif
200 } else { // Primitives
201 switch (ft) {
202 case T_LONG: st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
203 case T_DOUBLE: st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
204 case T_BYTE: st->print(" (" INT8_FORMAT_X_0 ")", obj->byte_field(offset())); break;
205 case T_CHAR: st->print(" (" INT16_FORMAT_X_0 ")", obj->char_field(offset())); break;
206 case T_FLOAT: st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset())); break;
207 case T_INT: st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset())); break;
208 case T_SHORT: st->print(" (" INT16_FORMAT_X_0 ")", obj->short_field(offset())); break;
209 case T_BOOLEAN: st->print(" (" INT8_FORMAT_X_0 ")", obj->bool_field(offset())); break;
210 default:
211 ShouldNotReachHere();
212 break;
213 }
214 }
215 }