1 /*
2 * Copyright (c) 1997, 2010, 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/instanceKlass.hpp"
31 #include "oops/fieldStreams.hpp"
32 #include "runtime/fieldDescriptor.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/signature.hpp"
35
36
37 oop fieldDescriptor::loader() const {
38 return instanceKlass::cast(_cp->pool_holder())->class_loader();
39 }
40
41 Symbol* fieldDescriptor::generic_signature() const {
42 int idx = 0;
43 instanceKlass* ik = instanceKlass::cast(field_holder());
44 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
45 if (idx == _index) {
46 return fs.generic_signature();
47 } else {
48 idx ++;
49 }
50 }
51 assert(false, "should never happen");
52 return NULL;
53 }
54
55 typeArrayOop fieldDescriptor::annotations() const {
56 instanceKlass* ik = instanceKlass::cast(field_holder());
57 objArrayOop md = ik->fields_annotations();
58 if (md == NULL)
59 return NULL;
60 return typeArrayOop(md->obj_at(index()));
61 }
62
63 constantTag fieldDescriptor::initial_value_tag() const {
64 return constants()->tag_at(initial_value_index());
65 }
66
67 jint fieldDescriptor::int_initial_value() const {
68 return constants()->int_at(initial_value_index());
69 }
70
71 jlong fieldDescriptor::long_initial_value() const {
72 return constants()->long_at(initial_value_index());
73 }
74
75 jfloat fieldDescriptor::float_initial_value() const {
76 return constants()->float_at(initial_value_index());
77 }
78
79 jdouble fieldDescriptor::double_initial_value() const {
80 return constants()->double_at(initial_value_index());
81 }
82
83 oop fieldDescriptor::string_initial_value(TRAPS) const {
84 return constants()->string_at(initial_value_index(), CHECK_0);
85 }
86
87 void fieldDescriptor::initialize(klassOop k, int index) {
88 instanceKlass* ik = instanceKlass::cast(k);
89 _cp = ik->constants();
90 FieldInfo* f = ik->field(index);
91 assert(!f->is_internal(), "regular Java fields only");
92
93 _access_flags = accessFlags_from(f->access_flags());
94 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
95 _index = index;
96 }
97
98 #ifndef PRODUCT
99
100 void fieldDescriptor::print_on(outputStream* st) const {
101 access_flags().print_on(st);
102 name()->print_value_on(st);
103 st->print(" ");
104 signature()->print_value_on(st);
105 st->print(" @%d ", offset());
106 if (WizardMode && has_initial_value()) {
107 st->print("(initval ");
108 constantTag t = initial_value_tag();
109 if (t.is_int()) {
110 st->print("int %d)", int_initial_value());
111 } else if (t.is_long()){
112 st->print_jlong(long_initial_value());
113 } else if (t.is_float()){
114 st->print("float %f)", float_initial_value());
115 } else if (t.is_double()){
116 st->print("double %lf)", double_initial_value());
117 }
118 }
119 }
120
121 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
122 print_on(st);
123 BasicType ft = field_type();
124 jint as_int = 0;
125 switch (ft) {
126 case T_BYTE:
127 as_int = (jint)obj->byte_field(offset());
128 st->print(" %d", obj->byte_field(offset()));
129 break;
130 case T_CHAR:
131 as_int = (jint)obj->char_field(offset());
132 {
133 jchar c = obj->char_field(offset());
134 as_int = c;
135 st->print(" %c %d", isprint(c) ? c : ' ', c);
136 }
137 break;
138 case T_DOUBLE:
139 st->print(" %lf", obj->double_field(offset()));
140 break;
141 case T_FLOAT:
142 as_int = obj->int_field(offset());
143 st->print(" %f", obj->float_field(offset()));
144 break;
145 case T_INT:
146 as_int = obj->int_field(offset());
147 st->print(" %d", obj->int_field(offset()));
148 break;
149 case T_LONG:
150 st->print(" ");
151 st->print_jlong(obj->long_field(offset()));
152 break;
153 case T_SHORT:
154 as_int = obj->short_field(offset());
155 st->print(" %d", obj->short_field(offset()));
156 break;
157 case T_BOOLEAN:
158 as_int = obj->bool_field(offset());
159 st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
160 break;
161 case T_ARRAY:
162 st->print(" ");
163 NOT_LP64(as_int = obj->int_field(offset()));
164 obj->obj_field(offset())->print_value_on(st);
165 break;
166 case T_OBJECT:
167 st->print(" ");
168 NOT_LP64(as_int = obj->int_field(offset()));
169 obj->obj_field(offset())->print_value_on(st);
170 break;
171 default:
172 ShouldNotReachHere();
173 break;
174 }
175 // Print a hint as to the underlying integer representation. This can be wrong for
176 // pointers on an LP64 machine
177 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
178 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
179 } else if (as_int < 0 || as_int > 9) {
180 st->print(" (%x)", as_int);
181 }
182 }
183
184 #endif /* PRODUCT */