fieldDescriptor.cpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1997, 2009, 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 "incls/_precompiled.incl"
26#include "incls/_fieldDescriptor.cpp.incl"
27
28
29oop fieldDescriptor::loader() const {
30  return instanceKlass::cast(_cp->pool_holder())->class_loader();
31}
32
33typeArrayOop fieldDescriptor::annotations() const {
34  instanceKlass* ik = instanceKlass::cast(field_holder());
35  objArrayOop md = ik->fields_annotations();
36  if (md == NULL)
37    return NULL;
38  assert((index() % instanceKlass::next_offset) == 0, "");
39  return typeArrayOop(md->obj_at(index() / instanceKlass::next_offset));
40}
41
42constantTag fieldDescriptor::initial_value_tag() const {
43  return constants()->tag_at(_initial_value_index);
44}
45
46jint fieldDescriptor::int_initial_value() const {
47  return constants()->int_at(_initial_value_index);
48}
49
50jlong fieldDescriptor::long_initial_value() const {
51  return constants()->long_at(_initial_value_index);
52}
53
54jfloat fieldDescriptor::float_initial_value() const {
55  return constants()->float_at(_initial_value_index);
56}
57
58jdouble fieldDescriptor::double_initial_value() const {
59  return constants()->double_at(_initial_value_index);
60}
61
62oop fieldDescriptor::string_initial_value(TRAPS) const {
63  return constants()->string_at(_initial_value_index, CHECK_0);
64}
65
66void fieldDescriptor::initialize(klassOop k, int index) {
67  instanceKlass* ik = instanceKlass::cast(k);
68  _cp = ik->constants();
69  typeArrayOop fields = ik->fields();
70
71  assert(fields->length() % instanceKlass::next_offset == 0, "Illegal size of field array");
72  assert(fields->length() >= index + instanceKlass::next_offset, "Illegal size of field array");
73
74  _access_flags.set_field_flags(fields->ushort_at(index + instanceKlass::access_flags_offset));
75  _name_index = fields->ushort_at(index + instanceKlass::name_index_offset);
76  _signature_index = fields->ushort_at(index + instanceKlass::signature_index_offset);
77  _initial_value_index = fields->ushort_at(index + instanceKlass::initval_index_offset);
78  guarantee(_name_index != 0 && _signature_index != 0, "bad constant pool index for fieldDescriptor");
79  _offset = ik->offset_from_fields( index );
80  _generic_signature_index = fields->ushort_at(index + instanceKlass::generic_signature_offset);
81  _index = index;
82}
83
84#ifndef PRODUCT
85
86void fieldDescriptor::print_on(outputStream* st) const {
87  _access_flags.print_on(st);
88  constants()->symbol_at(_name_index)->print_value_on(st);
89  st->print(" ");
90  constants()->symbol_at(_signature_index)->print_value_on(st);
91  st->print(" @%d ", offset());
92  if (WizardMode && has_initial_value()) {
93    st->print("(initval ");
94    constantTag t = initial_value_tag();
95    if (t.is_int()) {
96      st->print("int %d)", int_initial_value());
97    } else if (t.is_long()){
98      st->print_jlong(long_initial_value());
99    } else if (t.is_float()){
100      st->print("float %f)", float_initial_value());
101    } else if (t.is_double()){
102      st->print("double %lf)", double_initial_value());
103    }
104  }
105}
106
107void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
108  print_on(st);
109  BasicType ft = field_type();
110  jint as_int = 0;
111  switch (ft) {
112    case T_BYTE:
113      as_int = (jint)obj->byte_field(offset());
114      st->print(" %d", obj->byte_field(offset()));
115      break;
116    case T_CHAR:
117      as_int = (jint)obj->char_field(offset());
118      {
119        jchar c = obj->char_field(offset());
120        as_int = c;
121        st->print(" %c %d", isprint(c) ? c : ' ', c);
122      }
123      break;
124    case T_DOUBLE:
125      st->print(" %lf", obj->double_field(offset()));
126      break;
127    case T_FLOAT:
128      as_int = obj->int_field(offset());
129      st->print(" %f", obj->float_field(offset()));
130      break;
131    case T_INT:
132      as_int = obj->int_field(offset());
133      st->print(" %d", obj->int_field(offset()));
134      break;
135    case T_LONG:
136      st->print(" ");
137      st->print_jlong(obj->long_field(offset()));
138      break;
139    case T_SHORT:
140      as_int = obj->short_field(offset());
141      st->print(" %d", obj->short_field(offset()));
142      break;
143    case T_BOOLEAN:
144      as_int = obj->bool_field(offset());
145      st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
146      break;
147    case T_ARRAY:
148      st->print(" ");
149      NOT_LP64(as_int = obj->int_field(offset()));
150      obj->obj_field(offset())->print_value_on(st);
151      break;
152    case T_OBJECT:
153      st->print(" ");
154      NOT_LP64(as_int = obj->int_field(offset()));
155      obj->obj_field(offset())->print_value_on(st);
156      break;
157    default:
158      ShouldNotReachHere();
159      break;
160  }
161  // Print a hint as to the underlying integer representation. This can be wrong for
162  // pointers on an LP64 machine
163  if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
164    st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
165  } else if (as_int < 0 || as_int > 9) {
166    st->print(" (%x)", as_int);
167  }
168}
169
170#endif /* PRODUCT */
171