1 /*
2 * Copyright (c) 1997, 2013, 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.inline.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/instanceKlass.hpp"
32 #include "oops/fieldStreams.hpp"
33 #include "runtime/fieldDescriptor.hpp"
34 #include "runtime/handles.inline.hpp"
35 #include "runtime/signature.hpp"
36
37
38 oop fieldDescriptor::loader() const {
39 return _cp->pool_holder()->class_loader();
40 }
41
42 Symbol* fieldDescriptor::generic_signature() const {
43 if (!has_generic_signature()) {
44 return NULL;
45 }
46
47 int idx = 0;
48 InstanceKlass* ik = field_holder();
49 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
50 if (idx == _index) {
51 return fs.generic_signature();
52 } else {
53 idx ++;
54 }
55 }
56 assert(false, "should never happen");
57 return NULL;
58 }
59
60 AnnotationArray* fieldDescriptor::annotations() const {
61 InstanceKlass* ik = field_holder();
62 Array<AnnotationArray*>* md = ik->fields_annotations();
63 if (md == NULL)
64 return NULL;
65 return md->at(index());
66 }
67
68 AnnotationArray* fieldDescriptor::type_annotations() const {
69 InstanceKlass* ik = field_holder();
70 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
71 if (type_annos == NULL)
72 return NULL;
73 return type_annos->at(index());
74 }
75
76 constantTag fieldDescriptor::initial_value_tag() const {
77 return constants()->tag_at(initial_value_index());
78 }
79
80 jint fieldDescriptor::int_initial_value() const {
81 return constants()->int_at(initial_value_index());
82 }
83
84 jlong fieldDescriptor::long_initial_value() const {
85 return constants()->long_at(initial_value_index());
86 }
87
88 jfloat fieldDescriptor::float_initial_value() const {
89 return constants()->float_at(initial_value_index());
90 }
91
92 jdouble fieldDescriptor::double_initial_value() const {
93 return constants()->double_at(initial_value_index());
94 }
95
96 oop fieldDescriptor::string_initial_value(TRAPS) const {
97 return constants()->uncached_string_at(initial_value_index(), CHECK_0);
98 }
99
100 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
101 if (_cp.is_null() || field_holder() != ik) {
102 _cp = constantPoolHandle(Thread::current(), ik->constants());
103 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
104 assert(field_holder() == ik, "must be already initialized to this class");
105 }
106 FieldInfo* f = ik->field(index);
107 assert(!f->is_internal(), "regular Java fields only");
108
109 _access_flags = accessFlags_from(f->access_flags());
110 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
111 _index = index;
112 verify();
113 }
114
115 #ifndef PRODUCT
116
117 void fieldDescriptor::verify() const {
118 if (_cp.is_null()) {
119 assert(_index == badInt, "constructor must be called"); // see constructor
120 } else {
121 assert(_index >= 0, "good index");
122 assert(_index < field_holder()->java_fields_count(), "oob");
123 }
124 }
125
126 void fieldDescriptor::print_on(outputStream* st) const {
127 access_flags().print_on(st);
128 name()->print_value_on(st);
129 st->print(" ");
130 signature()->print_value_on(st);
131 st->print(" @%d ", offset());
132 if (WizardMode && has_initial_value()) {
133 st->print("(initval ");
134 constantTag t = initial_value_tag();
135 if (t.is_int()) {
136 st->print("int %d)", int_initial_value());
137 } else if (t.is_long()){
138 st->print_jlong(long_initial_value());
139 } else if (t.is_float()){
140 st->print("float %f)", float_initial_value());
141 } else if (t.is_double()){
142 st->print("double %lf)", double_initial_value());
143 }
144 }
145 }
146
147 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
148 print_on(st);
149 BasicType ft = field_type();
150 jint as_int = 0;
151 switch (ft) {
152 case T_BYTE:
153 as_int = (jint)obj->byte_field(offset());
154 st->print(" %d", obj->byte_field(offset()));
155 break;
156 case T_CHAR:
157 as_int = (jint)obj->char_field(offset());
158 {
159 jchar c = obj->char_field(offset());
160 as_int = c;
161 st->print(" %c %d", isprint(c) ? c : ' ', c);
162 }
163 break;
164 case T_DOUBLE:
165 st->print(" %lf", obj->double_field(offset()));
166 break;
167 case T_FLOAT:
168 as_int = obj->int_field(offset());
169 st->print(" %f", obj->float_field(offset()));
170 break;
171 case T_INT:
172 as_int = obj->int_field(offset());
173 st->print(" %d", obj->int_field(offset()));
174 break;
175 case T_LONG:
176 st->print(" ");
177 st->print_jlong(obj->long_field(offset()));
178 break;
179 case T_SHORT:
180 as_int = obj->short_field(offset());
181 st->print(" %d", obj->short_field(offset()));
182 break;
183 case T_BOOLEAN:
184 as_int = obj->bool_field(offset());
185 st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
186 break;
187 case T_ARRAY:
188 st->print(" ");
189 NOT_LP64(as_int = obj->int_field(offset()));
190 obj->obj_field(offset())->print_value_on(st);
191 break;
192 case T_OBJECT:
193 st->print(" ");
194 NOT_LP64(as_int = obj->int_field(offset()));
195 obj->obj_field(offset())->print_value_on(st);
196 break;
197 default:
198 ShouldNotReachHere();
199 break;
200 }
201 // Print a hint as to the underlying integer representation. This can be wrong for
202 // pointers on an LP64 machine
203 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
204 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
205 } else if (as_int < 0 || as_int > 9) {
206 st->print(" (%x)", as_int);
207 }
208 }
209
210 #endif /* PRODUCT */