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 "runtime/fieldDescriptor.hpp"
32 #include "runtime/handles.inline.hpp"
33 #include "runtime/signature.hpp"
34
35
36 oop fieldDescriptor::loader() const {
37 return instanceKlass::cast(_cp->pool_holder())->class_loader();
38 }
39
40 typeArrayOop fieldDescriptor::annotations() const {
41 instanceKlass* ik = instanceKlass::cast(field_holder());
42 objArrayOop md = ik->fields_annotations();
43 if (md == NULL)
44 return NULL;
45 assert((index() % instanceKlass::next_offset) == 0, "");
46 return typeArrayOop(md->obj_at(index() / instanceKlass::next_offset));
47 }
48
49 constantTag fieldDescriptor::initial_value_tag() const {
50 return constants()->tag_at(_initial_value_index);
51 }
52
53 jint fieldDescriptor::int_initial_value() const {
54 return constants()->int_at(_initial_value_index);
55 }
56
57 jlong fieldDescriptor::long_initial_value() const {
58 return constants()->long_at(_initial_value_index);
59 }
60
61 jfloat fieldDescriptor::float_initial_value() const {
62 return constants()->float_at(_initial_value_index);
63 }
64
65 jdouble fieldDescriptor::double_initial_value() const {
66 return constants()->double_at(_initial_value_index);
67 }
68
69 oop fieldDescriptor::string_initial_value(TRAPS) const {
70 return constants()->string_at(_initial_value_index, CHECK_0);
71 }
72
73 void fieldDescriptor::initialize(klassOop k, int index) {
74 instanceKlass* ik = instanceKlass::cast(k);
75 _cp = ik->constants();
76 typeArrayOop fields = ik->fields();
77
78 assert(fields->length() % instanceKlass::next_offset == 0, "Illegal size of field array");
79 assert(fields->length() >= index + instanceKlass::next_offset, "Illegal size of field array");
80
81 _access_flags.set_field_flags(fields->ushort_at(index + instanceKlass::access_flags_offset));
82 _name_index = fields->ushort_at(index + instanceKlass::name_index_offset);
83 _signature_index = fields->ushort_at(index + instanceKlass::signature_index_offset);
84 _initial_value_index = fields->ushort_at(index + instanceKlass::initval_index_offset);
85 guarantee(_name_index != 0 && _signature_index != 0, "bad constant pool index for fieldDescriptor");
86 _offset = ik->offset_from_fields( index );
87 _generic_signature_index = fields->ushort_at(index + instanceKlass::generic_signature_offset);
88 _index = index;
89 }
90
91 #ifndef PRODUCT
92
93 void fieldDescriptor::print_on(outputStream* st) const {
94 _access_flags.print_on(st);
95 constants()->symbol_at(_name_index)->print_value_on(st);
96 st->print(" ");
97 constants()->symbol_at(_signature_index)->print_value_on(st);
98 st->print(" @%d ", offset());
99 if (WizardMode && has_initial_value()) {
100 st->print("(initval ");
101 constantTag t = initial_value_tag();
102 if (t.is_int()) {
103 st->print("int %d)", int_initial_value());
104 } else if (t.is_long()){
105 st->print_jlong(long_initial_value());
106 } else if (t.is_float()){
107 st->print("float %f)", float_initial_value());
108 } else if (t.is_double()){
109 st->print("double %lf)", double_initial_value());
110 }
111 }
112 }
113
114 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
115 print_on(st);
116 BasicType ft = field_type();
117 jint as_int = 0;
118 switch (ft) {
119 case T_BYTE:
120 as_int = (jint)obj->byte_field(offset());
121 st->print(" %d", obj->byte_field(offset()));
122 break;
123 case T_CHAR:
124 as_int = (jint)obj->char_field(offset());
125 {
126 jchar c = obj->char_field(offset());
127 as_int = c;
128 st->print(" %c %d", isprint(c) ? c : ' ', c);
129 }
130 break;
131 case T_DOUBLE:
132 st->print(" %lf", obj->double_field(offset()));
133 break;
134 case T_FLOAT:
135 as_int = obj->int_field(offset());
136 st->print(" %f", obj->float_field(offset()));
137 break;
138 case T_INT:
139 as_int = obj->int_field(offset());
140 st->print(" %d", obj->int_field(offset()));
141 break;
142 case T_LONG:
143 st->print(" ");
144 st->print_jlong(obj->long_field(offset()));
145 break;
146 case T_SHORT:
147 as_int = obj->short_field(offset());
148 st->print(" %d", obj->short_field(offset()));
149 break;
150 case T_BOOLEAN:
151 as_int = obj->bool_field(offset());
152 st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
153 break;
154 case T_ARRAY:
155 st->print(" ");
156 NOT_LP64(as_int = obj->int_field(offset()));
157 obj->obj_field(offset())->print_value_on(st);
158 break;
159 case T_OBJECT:
160 st->print(" ");
161 NOT_LP64(as_int = obj->int_field(offset()));
162 obj->obj_field(offset())->print_value_on(st);
163 break;
164 default:
165 ShouldNotReachHere();
166 break;
167 }
168 // Print a hint as to the underlying integer representation. This can be wrong for
169 // pointers on an LP64 machine
170 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
171 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
172 } else if (as_int < 0 || as_int > 9) {
173 st->print(" (%x)", as_int);
174 }
175 }
176
177 #endif /* PRODUCT */