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 Symbol* fieldDescriptor::generic_signature() const {
40 if (!has_generic_signature()) {
41 return NULL;
42 }
43
44 int idx = 0;
45 InstanceKlass* ik = field_holder();
46 for (AllFieldStream fs(ik); !fs.done(); fs.next()) {
47 if (idx == _index) {
48 return fs.generic_signature();
49 } else {
50 idx ++;
51 }
52 }
53 assert(false, "should never happen");
54 return vmSymbols::void_signature(); // return a default value (for code analyzers)
55 }
56
57 bool fieldDescriptor::is_trusted_final() const {
58 InstanceKlass* ik = field_holder();
59 return is_final() && (is_static() || ik->is_hidden() || ik->is_record() || ik->is_inline_klass());
60 }
61
62 AnnotationArray* fieldDescriptor::annotations() const {
63 InstanceKlass* ik = field_holder();
64 Array<AnnotationArray*>* md = ik->fields_annotations();
65 if (md == NULL)
66 return NULL;
67 return md->at(index());
68 }
69
70 AnnotationArray* fieldDescriptor::type_annotations() const {
71 InstanceKlass* ik = field_holder();
72 Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();
73 if (type_annos == NULL)
74 return NULL;
75 return type_annos->at(index());
76 }
77
78 constantTag fieldDescriptor::initial_value_tag() const {
79 return constants()->tag_at(initial_value_index());
80 }
81
82 jint fieldDescriptor::int_initial_value() const {
83 return constants()->int_at(initial_value_index());
84 }
85
86 jlong fieldDescriptor::long_initial_value() const {
87 return constants()->long_at(initial_value_index());
88 }
89
90 jfloat fieldDescriptor::float_initial_value() const {
91 return constants()->float_at(initial_value_index());
92 }
93
94 jdouble fieldDescriptor::double_initial_value() const {
95 return constants()->double_at(initial_value_index());
96 }
97
98 oop fieldDescriptor::string_initial_value(TRAPS) const {
99 return constants()->uncached_string_at(initial_value_index(), THREAD);
100 }
101
102 void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {
103 if (_cp.is_null() || field_holder() != ik) {
104 _cp = constantPoolHandle(Thread::current(), ik->constants());
105 // _cp should now reference ik's constant pool; i.e., ik is now field_holder.
106 assert(field_holder() == ik, "must be already initialized to this class");
107 }
108 FieldInfo* f = ik->field(index);
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(access_flags().is_internal() ||
123 _index < field_holder()->java_fields_count(), "oob");
124 }
125 }
126
127 #endif /* PRODUCT */
128
129 void fieldDescriptor::print_on(outputStream* st) const {
130 access_flags().print_on(st);
131 if (access_flags().is_internal()) st->print("internal ");
132 name()->print_value_on(st);
133 st->print(" ");
134 signature()->print_value_on(st);
135 st->print(" @%d ", offset());
136 if (WizardMode && has_initial_value()) {
137 st->print("(initval ");
138 constantTag t = initial_value_tag();
139 if (t.is_int()) {
140 st->print("int %d)", int_initial_value());
141 } else if (t.is_long()){
142 st->print_jlong(long_initial_value());
143 } else if (t.is_float()){
144 st->print("float %f)", float_initial_value());
145 } else if (t.is_double()){
146 st->print("double %lf)", double_initial_value());
147 }
148 }
149 }
150
151 void fieldDescriptor::print() const { print_on(tty); }
152
153 void fieldDescriptor::print_on_for(outputStream* st, oop obj) {
154 BasicType ft = field_type();
155 if (ft != T_PRIMITIVE_OBJECT) {
156 print_on(st);
157 st->print(" ");
158 }
159 jint as_int = 0;
160 switch (ft) {
161 case T_BYTE:
162 st->print("%d", obj->byte_field(offset()));
163 break;
164 case T_CHAR:
165 {
166 jchar c = obj->char_field(offset());
167 st->print("%c %d", isprint(c) ? c : ' ', c);
168 }
169 break;
170 case T_DOUBLE:
171 st->print("%lf", obj->double_field(offset()));
172 break;
173 case T_FLOAT:
174 st->print("%f", obj->float_field(offset()));
175 break;
176 case T_INT:
177 st->print("%d", obj->int_field(offset()));
178 break;
179 case T_LONG:
180 st->print_jlong(obj->long_field(offset()));
181 break;
182 case T_SHORT:
183 st->print("%d", obj->short_field(offset()));
184 break;
185 case T_BOOLEAN:
186 st->print("%s", obj->bool_field(offset()) ? "true" : "false");
187 break;
188 case T_PRIMITIVE_OBJECT:
189 if (is_inlined()) {
190 // Print fields of inlined fields (recursively)
191 InlineKlass* vk = InlineKlass::cast(field_holder()->get_inline_type_field_klass(index()));
192 int field_offset = offset() - vk->first_field_offset();
193 obj = cast_to_oop(cast_from_oop<address>(obj) + field_offset);
194 st->print_cr("Inline type field inlined '%s':", vk->name()->as_C_string());
195 FieldPrinter print_field(st, obj);
196 vk->do_nonstatic_fields(&print_field);
197 return; // Do not print underlying representation
198 }
199 // inline type field not inlined, fall through
200 case T_ARRAY:
201 case T_OBJECT:
202 if (obj->obj_field(offset()) != NULL) {
203 obj->obj_field(offset())->print_value_on(st);
204 } else {
205 st->print("NULL");
206 }
207 break;
208 default:
209 ShouldNotReachHere();
210 break;
211 }
212
213 // Print a hint as to the underlying integer representation.
214 if (is_reference_type(ft)) {
215 #ifdef _LP64
216 if (UseCompressedOops) {
217 st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
218 } else {
219 st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset()));
220 }
221 #else
222 st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset()));
223 #endif
224 } else { // Primitives
225 switch (ft) {
226 case T_LONG: st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
227 case T_DOUBLE: st->print(" (" INT64_FORMAT_X_0 ")", (int64_t)obj->long_field(offset())); break;
228 case T_BYTE: st->print(" (" INT8_FORMAT_X_0 ")", obj->byte_field(offset())); break;
229 case T_CHAR: st->print(" (" INT16_FORMAT_X_0 ")", obj->char_field(offset())); break;
230 case T_FLOAT: st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset())); break;
231 case T_INT: st->print(" (" INT32_FORMAT_X_0 ")", obj->int_field(offset())); break;
232 case T_SHORT: st->print(" (" INT16_FORMAT_X_0 ")", obj->short_field(offset())); break;
233 case T_BOOLEAN: st->print(" (" INT8_FORMAT_X_0 ")", obj->bool_field(offset())); break;
234 default:
235 ShouldNotReachHere();
236 break;
237 }
238 }
239 st->cr();
240 }