1 /*
2 * Copyright (c) 1997, 2020, 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/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "memory/resourceArea.hpp"
29 #include "oops/annotations.hpp"
30 #include "oops/constantPool.hpp"
31 #include "oops/instanceKlass.hpp"
32 #include "oops/klass.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "oops/fieldStreams.inline.hpp"
35 #include "runtime/fieldDescriptor.inline.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/signature.hpp"
38
39
loader() const40 oop fieldDescriptor::loader() const {
41 return _cp->pool_holder()->class_loader();
42 }
43
generic_signature() const44 Symbol* fieldDescriptor::generic_signature() const {
45 if (!has_generic_signature()) {
46 return NULL;
47 }
48
49 int idx = 0;
50 InstanceKlass* ik = field_holder();
51 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
52 if (idx == _index) {
53 return fs.generic_signature();
54 } else {
55 idx ++;
56 }
57 }
58 assert(false, "should never happen");
59 return NULL;
60 }
61
is_trusted_final() const62 bool fieldDescriptor::is_trusted_final() const {
63 InstanceKlass* ik = field_holder();
64 return is_final() && (is_static() || ik->is_hidden() || ik->is_record());
65 }
66
annotations() const67 AnnotationArray* fieldDescriptor::annotations() const {
68 InstanceKlass* ik = field_holder();
69 Array<AnnotationArray*>* md = ik->fields_annotations();
70 if (md == NULL)
71 return NULL;
72 return md->at(index());
73 }
74
type_annotations() const75 AnnotationArray* fieldDescriptor::type_annotations() const {
76 InstanceKlass* ik = field_holder();
77 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
78 if (type_annos == NULL)
79 return NULL;
80 return type_annos->at(index());
81 }
82
initial_value_tag() const83 constantTag fieldDescriptor::initial_value_tag() const {
84 return constants()->tag_at(initial_value_index());
85 }
86
int_initial_value() const87 jint fieldDescriptor::int_initial_value() const {
88 return constants()->int_at(initial_value_index());
89 }
90
long_initial_value() const91 jlong fieldDescriptor::long_initial_value() const {
92 return constants()->long_at(initial_value_index());
93 }
94
float_initial_value() const95 jfloat fieldDescriptor::float_initial_value() const {
96 return constants()->float_at(initial_value_index());
97 }
98
double_initial_value() const99 jdouble fieldDescriptor::double_initial_value() const {
100 return constants()->double_at(initial_value_index());
101 }
102
string_initial_value(TRAPS) const103 oop fieldDescriptor::string_initial_value(TRAPS) const {
104 return constants()->uncached_string_at(initial_value_index(), THREAD);
105 }
106
reinitialize(InstanceKlass * ik,int index)107 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
108 if (_cp.is_null() || field_holder() != ik) {
109 _cp = constantPoolHandle(Thread::current(), ik->constants());
110 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
111 assert(field_holder() == ik, "must be already initialized to this class");
112 }
113 FieldInfo* f = ik->field(index);
114 assert(!f->is_internal(), "regular Java fields only");
115
116 _access_flags = accessFlags_from(f->access_flags());
117 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
118 _index = index;
119 verify();
120 }
121
122 #ifndef PRODUCT
123
verify() const124 void fieldDescriptor::verify() const {
125 if (_cp.is_null()) {
126 assert(_index == badInt, "constructor must be called"); // see constructor
127 } else {
128 assert(_index >= 0, "good index");
129 assert(_index < field_holder()->java_fields_count(), "oob");
130 }
131 }
132
print_on(outputStream * st) const133 void fieldDescriptor::print_on(outputStream* st) const {
134 access_flags().print_on(st);
135 name()->print_value_on(st);
136 st->print(" ");
137 signature()->print_value_on(st);
138 st->print(" @%d ", offset());
139 if (WizardMode && has_initial_value()) {
140 st->print("(initval ");
141 constantTag t = initial_value_tag();
142 if (t.is_int()) {
143 st->print("int %d)", int_initial_value());
144 } else if (t.is_long()){
145 st->print_jlong(long_initial_value());
146 } else if (t.is_float()){
147 st->print("float %f)", float_initial_value());
148 } else if (t.is_double()){
149 st->print("double %lf)", double_initial_value());
150 }
151 }
152 }
153
print() const154 void fieldDescriptor::print() const { print_on(tty); }
155
print_on_for(outputStream * st,oop obj)156 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
157 print_on(st);
158 BasicType ft = field_type();
159 jint as_int = 0;
160 switch (ft) {
161 case T_BYTE:
162 as_int = (jint)obj->byte_field(offset());
163 st->print(" %d", obj->byte_field(offset()));
164 break;
165 case T_CHAR:
166 as_int = (jint)obj->char_field(offset());
167 {
168 jchar c = obj->char_field(offset());
169 as_int = c;
170 st->print(" %c %d", isprint(c) ? c : ' ', c);
171 }
172 break;
173 case T_DOUBLE:
174 st->print(" %lf", obj->double_field(offset()));
175 break;
176 case T_FLOAT:
177 as_int = obj->int_field(offset());
178 st->print(" %f", obj->float_field(offset()));
179 break;
180 case T_INT:
181 as_int = obj->int_field(offset());
182 st->print(" %d", obj->int_field(offset()));
183 break;
184 case T_LONG:
185 st->print(" ");
186 st->print_jlong(obj->long_field(offset()));
187 break;
188 case T_SHORT:
189 as_int = obj->short_field(offset());
190 st->print(" %d", obj->short_field(offset()));
191 break;
192 case T_BOOLEAN:
193 as_int = obj->bool_field(offset());
194 st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
195 break;
196 case T_ARRAY:
197 st->print(" ");
198 NOT_LP64(as_int = obj->int_field(offset()));
199 if (obj->obj_field(offset()) != NULL) {
200 obj->obj_field(offset())->print_value_on(st);
201 } else {
202 st->print("NULL");
203 }
204 break;
205 case T_OBJECT:
206 st->print(" ");
207 NOT_LP64(as_int = obj->int_field(offset()));
208 if (obj->obj_field(offset()) != NULL) {
209 obj->obj_field(offset())->print_value_on(st);
210 } else {
211 st->print("NULL");
212 }
213 break;
214 default:
215 ShouldNotReachHere();
216 break;
217 }
218 // Print a hint as to the underlying integer representation. This can be wrong for
219 // pointers on an LP64 machine
220 #ifdef _LP64
221 if (is_reference_type(ft) && UseCompressedOops) {
222 st->print(" (%x)", obj->int_field(offset()));
223 }
224 else // <- intended
225 #endif
226 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
227 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
228 } else if (as_int < 0 || as_int > 9) {
229 st->print(" (%x)", as_int);
230 }
231 }
232
233 #endif /* PRODUCT */
234