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