1 /*
2 * Copyright (c) 1997, 2021, 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/vmSymbols.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "oops/annotations.hpp"
29 #include "oops/constantPool.hpp"
30 #include "oops/instanceKlass.hpp"
31 #include "oops/klass.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "oops/fieldStreams.inline.hpp"
34 #include "oops/inlineKlass.inline.hpp"
35 #include "runtime/fieldDescriptor.inline.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/signature.hpp"
38
39
40 oop fieldDescriptor::loader() const {
41 return _cp->pool_holder()->class_loader();
42 }
43
44 Symbol* fieldDescriptor::generic_signature() const {
45 if (!has_generic_signature()) {
46 return NULL;
47 }
48
49 int idx = 0;
50 InstanceKlass* ik = field_holder();
51 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
52 if (idx == _index) {
53 return fs.generic_signature();
54 } else {
55 idx ++;
56 }
57 }
58 assert(false, "should never happen");
59 return vmSymbols::void_signature(); // return a default value (for code analyzers)
60 }
61
62 bool fieldDescriptor::is_trusted_final() const {
63 InstanceKlass* ik = field_holder();
64 return is_final() && (is_static() || ik->is_hidden() || ik->is_record() || ik->is_inline_klass());
65 }
66
67 AnnotationArray* fieldDescriptor::annotations() const {
68 InstanceKlass* ik = field_holder();
69 Array<AnnotationArray*>* md = ik->fields_annotations();
70 if (md == NULL)
71 return NULL;
72 return md->at(index());
73 }
74
75 AnnotationArray* fieldDescriptor::type_annotations() const {
76 InstanceKlass* ik = field_holder();
77 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
78 if (type_annos == NULL)
79 return NULL;
80 return type_annos->at(index());
81 }
82
83 constantTag fieldDescriptor::initial_value_tag() const {
84 return constants()->tag_at(initial_value_index());
85 }
86
87 jint fieldDescriptor::int_initial_value() const {
88 return constants()->int_at(initial_value_index());
89 }
90
91 jlong fieldDescriptor::long_initial_value() const {
92 return constants()->long_at(initial_value_index());
93 }
94
95 jfloat fieldDescriptor::float_initial_value() const {
96 return constants()->float_at(initial_value_index());
97 }
98
99 jdouble fieldDescriptor::double_initial_value() const {
100 return constants()->double_at(initial_value_index());
101 }
102
103 oop fieldDescriptor::string_initial_value(TRAPS) const {
104 return constants()->uncached_string_at(initial_value_index(), THREAD);
105 }
106
107 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
108 if (_cp.is_null() || field_holder() != ik) {
109 _cp = constantPoolHandle(Thread::current(), ik->constants());
110 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
111 assert(field_holder() == ik, "must be already initialized to this class");
112 }
113 FieldInfo* f = ik->field(index);
114 _access_flags = accessFlags_from(f->access_flags());
115 guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");
116 _index = index;
117 verify();
118 }
119
120 #ifndef PRODUCT
121
122 void fieldDescriptor::verify() const {
123 if (_cp.is_null()) {
124 assert(_index == badInt, "constructor must be called"); // see constructor
125 } else {
126 assert(_index >= 0, "good index");
127 assert(access_flags().is_internal() ||
128 _index < field_holder()->java_fields_count(), "oob");
129 }
130 }
131
132 #endif /* PRODUCT */
133
134 void fieldDescriptor::print_on(outputStream* st) const {
135 access_flags().print_on(st);
136 if (access_flags().is_internal()) st->print("internal ");
137 name()->print_value_on(st);
138 st->print(" ");
139 signature()->print_value_on(st);
140 st->print(" @%d ", offset());
141 if (WizardMode && has_initial_value()) {
142 st->print("(initval ");
143 constantTag t = initial_value_tag();
144 if (t.is_int()) {
145 st->print("int %d)", int_initial_value());
146 } else if (t.is_long()){
147 st->print_jlong(long_initial_value());
148 } else if (t.is_float()){
149 st->print("float %f)", float_initial_value());
150 } else if (t.is_double()){
151 st->print("double %lf)", double_initial_value());
152 }
153 }
154 }
155
156 void fieldDescriptor::print() const { print_on(tty); }
157
158 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
159 BasicType ft = field_type();
160 if (ft != T_INLINE_TYPE) {
161 print_on(st);
162 }
163 jint as_int = 0;
164 switch (ft) {
165 case T_BYTE:
166 as_int = (jint)obj->byte_field(offset());
167 st->print(" %d", obj->byte_field(offset()));
168 break;
169 case T_CHAR:
170 as_int = (jint)obj->char_field(offset());
171 {
172 jchar c = obj->char_field(offset());
173 as_int = c;
174 st->print(" %c %d", isprint(c) ? c : ' ', c);
175 }
176 break;
177 case T_DOUBLE:
178 st->print(" %lf", obj->double_field(offset()));
179 break;
180 case T_FLOAT:
181 as_int = obj->int_field(offset());
182 st->print(" %f", obj->float_field(offset()));
183 break;
184 case T_INT:
185 as_int = obj->int_field(offset());
186 st->print(" %d", obj->int_field(offset()));
187 break;
188 case T_LONG:
189 st->print(" ");
190 st->print_jlong(obj->long_field(offset()));
191 break;
192 case T_SHORT:
193 as_int = obj->short_field(offset());
194 st->print(" %d", obj->short_field(offset()));
195 break;
196 case T_BOOLEAN:
197 as_int = obj->bool_field(offset());
198 st->print(" %s", obj->bool_field(offset()) ? "true" : "false");
199 break;
200 case T_INLINE_TYPE:
201 if (is_inlined()) {
202 // Print fields of inlined fields (recursively)
203 InlineKlass* vk = InlineKlass::cast(field_holder()->get_inline_type_field_klass(index()));
204 int field_offset = offset() - vk->first_field_offset();
205 obj = cast_to_oop(cast_from_oop<address>(obj) + field_offset);
206 st->print_cr("Inline type field inlined '%s':", vk->name()->as_C_string());
207 FieldPrinter print_field(st, obj);
208 vk->do_nonstatic_fields(&print_field);
209 return; // Do not print underlying representation
210 }
211 // inline type field not inlined, fall through
212 case T_ARRAY:
213 case T_OBJECT:
214 st->print(" ");
215 NOT_LP64(as_int = obj->int_field(offset()));
216 if (obj->obj_field(offset()) != NULL) {
217 obj->obj_field(offset())->print_value_on(st);
218 } else {
219 st->print("NULL");
220 }
221 break;
222 default:
223 ShouldNotReachHere();
224 break;
225 }
226 // Print a hint as to the underlying integer representation. This can be wrong for
227 // pointers on an LP64 machine
228 #ifdef _LP64
229 if (is_reference_type(ft) && UseCompressedOops) {
230 st->print(" (%x)", obj->int_field(offset()));
231 }
232 else // <- intended
233 #endif
234 if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {
235 st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));
236 } else if (as_int < 0 || as_int > 9) {
237 st->print(" (%x)", as_int);
238 }
239 st->cr();
240 }
241