1 /*
2 * Copyright (c) 1997, 2018, 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 "memory/universe.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/instanceKlass.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "oops/fieldStreams.hpp"
34 #include "runtime/fieldDescriptor.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/signature.hpp"
37
38
loader() const39 oop fieldDescriptor::loader() const {
40 return _cp->pool_holder()->class_loader();
41 }
42
generic_signature() const43 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 NULL;
59 }
60
annotations() const61 AnnotationArray* fieldDescriptor::annotations() const {
62 InstanceKlass* ik = field_holder();
63 Array<AnnotationArray*>* md = ik->fields_annotations();
64 if (md == NULL)
65 return NULL;
66 return md->at(index());
67 }
68
type_annotations() const69 AnnotationArray* fieldDescriptor::type_annotations() const {
70 InstanceKlass* ik = field_holder();
71 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
72 if (type_annos == NULL)
73 return NULL;
74 return type_annos->at(index());
75 }
76
initial_value_tag() const77 constantTag fieldDescriptor::initial_value_tag() const {
78 return constants()->tag_at(initial_value_index());
79 }
80
int_initial_value() const81 jint fieldDescriptor::int_initial_value() const {
82 return constants()->int_at(initial_value_index());
83 }
84
long_initial_value() const85 jlong fieldDescriptor::long_initial_value() const {
86 return constants()->long_at(initial_value_index());
87 }
88
float_initial_value() const89 jfloat fieldDescriptor::float_initial_value() const {
90 return constants()->float_at(initial_value_index());
91 }
92
double_initial_value() const93 jdouble fieldDescriptor::double_initial_value() const {
94 return constants()->double_at(initial_value_index());
95 }
96
string_initial_value(TRAPS) const97 oop fieldDescriptor::string_initial_value(TRAPS) const {
98 return constants()->uncached_string_at(initial_value_index(), THREAD);
99 }
100
reinitialize(InstanceKlass * ik,int index)101 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
102 if (_cp.is_null() || field_holder() != ik) {
103 _cp = constantPoolHandle(Thread::current(), ik->constants());
104 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
105 assert(field_holder() == ik, "must be already initialized to this class");
106 }
107 FieldInfo* f = ik->field(index);
108 assert(!f->is_internal(), "regular Java fields only");
109
110 _access_flags = accessFlags_from(f->access_flags());
111 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
112 _index = index;
113 verify();
114 }
115
116 #ifndef PRODUCT
117
verify() const118 void fieldDescriptor::verify() const {
119 if (_cp.is_null()) {
120 assert(_index == badInt, "constructor must be called"); // see constructor
121 } else {
122 assert(_index >= 0, "good index");
123 assert(_index < field_holder()->java_fields_count(), "oob");
124 }
125 }
126
print_on(outputStream * st) const127 void fieldDescriptor::print_on(outputStream* st) const {
128 access_flags().print_on(st);
129 name()->print_value_on(st);
130 st->print(" ");
131 signature()->print_value_on(st);
132 st->print(" @%d ", offset());
133 if (WizardMode && has_initial_value()) {
134 st->print("(initval ");
135 constantTag t = initial_value_tag();
136 if (t.is_int()) {
137 st->print("int %d)", int_initial_value());
138 } else if (t.is_long()){
139 st->print_jlong(long_initial_value());
140 } else if (t.is_float()){
141 st->print("float %f)", float_initial_value());
142 } else if (t.is_double()){
143 st->print("double %lf)", double_initial_value());
144 }
145 }
146 }
147
print_on_for(outputStream * st,oop obj)148 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
149 print_on(st);
150 BasicType ft = field_type();
151 jint as_int = 0;
152 switch (ft) {
153 case T_BYTE:
154 as_int = (jint)obj->byte_field(offset());
155 st->print(" %d", obj->byte_field(offset()));
156 break;
157 case T_CHAR:
158 as_int = (jint)obj->char_field(offset());
159 {
160 jchar c = obj->char_field(offset());
161 as_int = c;
162 st->print(" %c %d", isprint(c) ? c : ' ', c);
163 }
164 break;
165 case T_DOUBLE:
166 st->print(" %lf", obj->double_field(offset()));
167 break;
168 case T_FLOAT:
169 as_int = obj->int_field(offset());
170 st->print(" %f", obj->float_field(offset()));
171 break;
172 case T_INT:
173 as_int = obj->int_field(offset());
174 st->print(" %d", obj->int_field(offset()));
175 break;
176 case T_LONG:
177 st->print(" ");
178 st->print_jlong(obj->long_field(offset()));
179 break;
180 case T_SHORT:
181 as_int = obj->short_field(offset());
182 st->print(" %d", obj->short_field(offset()));
183 break;
184 case T_BOOLEAN:
185 as_int = obj->bool_field(offset());
186 st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
187 break;
188 case T_ARRAY:
189 st->print(" ");
190 NOT_LP64(as_int = obj->int_field(offset()));
191 if (obj->obj_field(offset()) != NULL) {
192 obj->obj_field(offset())->print_value_on(st);
193 } else {
194 st->print_cr("NULL");
195 }
196 break;
197 case T_OBJECT:
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_cr("NULL");
204 }
205 break;
206 default:
207 ShouldNotReachHere();
208 break;
209 }
210 // Print a hint as to the underlying integer representation. This can be wrong for
211 // pointers on an LP64 machine
212 #ifdef _LP64
213 if ((ft == T_OBJECT || ft == T_ARRAY) && UseCompressedOops) {
214 st->print(" (%x)", obj->int_field(offset()));
215 }
216 else // <- intended
217 #endif
218 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
219 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
220 } else if (as_int < 0 || as_int > 9) {
221 st->print(" (%x)", as_int);
222 }
223 }
224
225 #endif /* PRODUCT */
226