1 /*
2 * Copyright (c) 1997, 2021, 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
39 oop fieldDescriptor::loader() const {
40 return _cp->pool_holder()->class_loader();
41 }
42
43 Symbol* fieldDescriptor::generic_signature() const {
44 if (!has_generic_signature()) {
45 return NULL;
46 }
47
48 int idx = 0;
49 InstanceKlass* ik = field_holder();
50 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
51 if (idx == _index) {
52 return fs.generic_signature();
53 } else {
54 idx ++;
55 }
56 }
57 assert(false, "should never happen");
58 return vmSymbols::void_signature(); // return a default value (for code analyzers)
59 }
60
61 bool fieldDescriptor::is_trusted_final() const {
62 InstanceKlass* ik = field_holder();
63 return is_final() && (is_static() || ik->is_hidden() || ik->is_record());
64 }
65
66 AnnotationArray* fieldDescriptor::annotations() const {
67 InstanceKlass* ik = field_holder();
68 Array<AnnotationArray*>* md = ik->fields_annotations();
69 if (md == NULL)
70 return NULL;
71 return md->at(index());
72 }
73
74 AnnotationArray* fieldDescriptor::type_annotations() const {
75 InstanceKlass* ik = field_holder();
76 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
77 if (type_annos == NULL)
78 return NULL;
79 return type_annos->at(index());
80 }
81
82 constantTag fieldDescriptor::initial_value_tag() const {
83 return constants()->tag_at(initial_value_index());
84 }
85
86 jint fieldDescriptor::int_initial_value() const {
87 return constants()->int_at(initial_value_index());
88 }
89
90 jlong fieldDescriptor::long_initial_value() const {
91 return constants()->long_at(initial_value_index());
92 }
93
94 jfloat fieldDescriptor::float_initial_value() const {
95 return constants()->float_at(initial_value_index());
96 }
97
98 jdouble fieldDescriptor::double_initial_value() const {
99 return constants()->double_at(initial_value_index());
100 }
101
102 oop fieldDescriptor::string_initial_value(TRAPS) const {
103 return constants()->uncached_string_at(initial_value_index(), THREAD);
104 }
105
106 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
107 if (_cp.is_null() || field_holder() != ik) {
108 _cp = constantPoolHandle(Thread::current(), ik->constants());
109 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
110 assert(field_holder() == ik, "must be already initialized to this class");
111 }
112 FieldInfo* f = ik->field(index);
113 _access_flags = accessFlags_from(f->access_flags());
114 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
115 _index = index;
116 verify();
117 }
118
119 #ifndef PRODUCT
120
121 void fieldDescriptor::verify() const {
122 if (_cp.is_null()) {
123 assert(_index == badInt, "constructor must be called"); // see constructor
124 } else {
125 assert(_index >= 0, "good index");
126 assert(access_flags().is_internal() ||
127 _index < field_holder()->java_fields_count(), "oob");
128 }
129 }
130
131 #endif /* PRODUCT */
132
133 void fieldDescriptor::print_on(outputStream* st) const {
134 access_flags().print_on(st);
135 if (access_flags().is_internal()) st->print("internal ");
136 name()->print_value_on(st);
137 st->print(" ");
138 signature()->print_value_on(st);
139 st->print(" @%d ", offset());
140 if (WizardMode && has_initial_value()) {
141 st->print("(initval ");
142 constantTag t = initial_value_tag();
143 if (t.is_int()) {
144 st->print("int %d)", int_initial_value());
145 } else if (t.is_long()){
146 st->print_jlong(long_initial_value());
147 } else if (t.is_float()){
148 st->print("float %f)", float_initial_value());
149 } else if (t.is_double()){
150 st->print("double %lf)", double_initial_value());
151 }
152 }
153 }
154
155 void fieldDescriptor::print() const { print_on(tty); }
156
157 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
158 print_on(st);
159 BasicType ft = field_type();
160 jint as_int = 0;
161 switch (ft) {
162 case T_BYTE:
163 as_int = (jint)obj->byte_field(offset());
164 st->print(" %d", obj->byte_field(offset()));
165 break;
166 case T_CHAR:
167 as_int = (jint)obj->char_field(offset());
168 {
169 jchar c = obj->char_field(offset());
170 as_int = c;
171 st->print(" %c %d", isprint(c) ? c : ' ', c);
172 }
173 break;
174 case T_DOUBLE:
175 st->print(" %lf", obj->double_field(offset()));
176 break;
177 case T_FLOAT:
178 as_int = obj->int_field(offset());
179 st->print(" %f", obj->float_field(offset()));
180 break;
181 case T_INT:
182 as_int = obj->int_field(offset());
183 st->print(" %d", obj->int_field(offset()));
184 break;
185 case T_LONG:
186 st->print(" ");
187 st->print_jlong(obj->long_field(offset()));
188 break;
189 case T_SHORT:
190 as_int = obj->short_field(offset());
191 st->print(" %d", obj->short_field(offset()));
192 break;
193 case T_BOOLEAN:
194 as_int = obj->bool_field(offset());
195 st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
196 break;
197 case T_ARRAY:
198 st->print(" ");
199 NOT_LP64(as_int = obj->int_field(offset()));
200 if (obj->obj_field(offset()) != NULL) {
201 obj->obj_field(offset())->print_value_on(st);
202 } else {
203 st->print("NULL");
204 }
205 break;
206 case T_OBJECT:
207 st->print(" ");
208 NOT_LP64(as_int = obj->int_field(offset()));
209 if (obj->obj_field(offset()) != NULL) {
210 obj->obj_field(offset())->print_value_on(st);
211 } else {
212 st->print("NULL");
213 }
214 break;
215 default:
216 ShouldNotReachHere();
217 break;
218 }
219 // Print a hint as to the underlying integer representation. This can be wrong for
220 // pointers on an LP64 machine
221 #ifdef _LP64
222 if (is_reference_type(ft) && UseCompressedOops) {
223 st->print(" (%x)", obj->int_field(offset()));
224 }
225 else // <- intended
226 #endif
227 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
228 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
229 } else if (as_int < 0 || as_int > 9) {
230 st->print(" (%x)", as_int);
231 }
232 }
233