1 /*
2 * Copyright (c) 1997, 2019, 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/altHashing.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "memory/heapShared.inline.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "memory/universe.hpp"
31 #include "oops/access.inline.hpp"
32 #include "oops/compressedOops.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "oops/verifyOopClosure.hpp"
35 #include "runtime/handles.inline.hpp"
36 #include "runtime/thread.inline.hpp"
37 #include "utilities/copy.hpp"
38 #include "utilities/macros.hpp"
39
40 bool always_do_update_barrier = false;
41
42 void oopDesc::print_on(outputStream* st) const {
43 klass()->oop_print_on(oop(this), st);
44 }
45
46 void oopDesc::print_address_on(outputStream* st) const {
47 st->print("{" INTPTR_FORMAT "}", p2i(this));
48
49 }
50
51 void oopDesc::print() { print_on(tty); }
52
53 void oopDesc::print_address() { print_address_on(tty); }
54
55 char* oopDesc::print_string() {
56 stringStream st;
57 print_on(&st);
58 return st.as_string();
59 }
60
61 void oopDesc::print_value() {
62 print_value_on(tty);
63 }
64
65 char* oopDesc::print_value_string() {
66 char buf[100];
67 stringStream st(buf, sizeof(buf));
68 print_value_on(&st);
69 return st.as_string();
70 }
71
72 void oopDesc::print_value_on(outputStream* st) const {
73 oop obj = oop(this);
74 if (java_lang_String::is_instance(obj)) {
75 java_lang_String::print(obj, st);
76 print_address_on(st);
77 } else {
78 klass()->oop_print_value_on(obj, st);
79 }
80 }
81
82
83 void oopDesc::verify_on(outputStream* st, oopDesc* oop_desc) {
84 if (oop_desc != NULL) {
85 oop_desc->klass()->oop_verify_on(oop_desc, st);
86 }
87 }
88
89
90 void oopDesc::verify(oopDesc* oop_desc) {
91 verify_on(tty, oop_desc);
92 }
93
94 intptr_t oopDesc::slow_identity_hash() {
95 // slow case; we have to acquire the micro lock in order to locate the header
96 Thread* THREAD = Thread::current();
97 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
98 HandleMark hm(THREAD);
99 Handle object(THREAD, this);
100 return ObjectSynchronizer::identity_hash_value_for(object);
101 }
102
103 // used only for asserts and guarantees
104 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
105 if (!Universe::heap()->is_oop(obj)) {
106 return false;
107 }
108
109 // Header verification: the mark is typically non-zero. If we're
110 // at a safepoint, it must not be zero.
111 // Outside of a safepoint, the header could be changing (for example,
112 // another thread could be inflating a lock on this object).
113 if (ignore_mark_word) {
114 return true;
115 }
116 if (obj->mark_raw().value() != 0) {
117 return true;
118 }
119 return !SafepointSynchronize::is_at_safepoint();
120 }
121
122 // used only for asserts and guarantees
123 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
124 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
125 }
126
127 VerifyOopClosure VerifyOopClosure::verify_oop;
128
129 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
130 oop obj = RawAccess<>::oop_load(p);
131 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
132 }
133
134 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
135 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
136
137 // type test operations that doesn't require inclusion of oop.inline.hpp.
138 bool oopDesc::is_instance_noinline() const { return is_instance(); }
139 bool oopDesc::is_array_noinline() const { return is_array(); }
140 bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
141 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
142
143 bool oopDesc::has_klass_gap() {
144 // Only has a klass gap when compressed class pointers are used.
145 return UseCompressedClassPointers;
146 }
147
148 void* oopDesc::load_klass_raw(oop obj) {
149 if (UseCompressedClassPointers) {
150 narrowKlass narrow_klass = *(obj->compressed_klass_addr());
151 if (narrow_klass == 0) return NULL;
152 return (void*)CompressedKlassPointers::decode_raw(narrow_klass);
153 } else {
154 return *(void**)(obj->klass_addr());
155 }
156 }
157
158 void* oopDesc::load_oop_raw(oop obj, int offset) {
159 uintptr_t addr = (uintptr_t)(void*)obj + (uint)offset;
160 if (UseCompressedOops) {
161 narrowOop narrow_oop = *(narrowOop*)addr;
162 if (narrow_oop == 0) return NULL;
163 return (void*)CompressedOops::decode_raw(narrow_oop);
164 } else {
165 return *(void**)addr;
166 }
167 }
168
169 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
170
171 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); }
172 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
173 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
174
175 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
176 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
177
178 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); }
179 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
180
181 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
182 Metadata* oopDesc::metadata_field_raw(int offset) const { return RawAccess<>::load_at(as_oop(), offset); }
183 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); }
184
185 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
186 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
187
188 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
189 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
190
191 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
192 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
193
194 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
195 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }
196
197 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
198 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
199
200 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
201 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
202
203 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
204 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
205
206 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
207 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
208
209 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
210 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
211
212 #ifdef ASSERT
213 void oopDesc::verify_forwardee(oop forwardee) {
214 Universe::heap()->check_oop_location(forwardee);
215 #if INCLUDE_CDS_JAVA_HEAP
216 assert(!HeapShared::is_archived_object(forwardee) && !HeapShared::is_archived_object(this),
217 "forwarding archive object");
218 #endif
219 }
220 #endif