1 /*
2 * Copyright (c) 1997, 2018, 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 "oops/access.inline.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "oops/verifyOopClosure.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/thread.inline.hpp"
35 #include "utilities/copy.hpp"
36
37 bool always_do_update_barrier = false;
38
39 void oopDesc::print_on(outputStream* st) const {
40 klass()->oop_print_on(oop(this), st);
41 }
42
43 void oopDesc::print_address_on(outputStream* st) const {
44 st->print("{" INTPTR_FORMAT "}", p2i(this));
45
46 }
47
48 void oopDesc::print() { print_on(tty); }
49
50 void oopDesc::print_address() { print_address_on(tty); }
51
52 char* oopDesc::print_string() {
53 stringStream st;
54 print_on(&st);
55 return st.as_string();
56 }
57
58 void oopDesc::print_value() {
59 print_value_on(tty);
60 }
61
62 char* oopDesc::print_value_string() {
63 char buf[100];
64 stringStream st(buf, sizeof(buf));
65 print_value_on(&st);
66 return st.as_string();
67 }
68
69 void oopDesc::print_value_on(outputStream* st) const {
70 oop obj = oop(this);
71 if (java_lang_String::is_instance(obj)) {
72 java_lang_String::print(obj, st);
73 print_address_on(st);
74 } else {
75 klass()->oop_print_value_on(obj, st);
76 }
77 }
78
79
80 void oopDesc::verify_on(outputStream* st, oopDesc* oop_desc) {
81 if (oop_desc != NULL) {
82 oop_desc->klass()->oop_verify_on(oop_desc, st);
83 }
84 }
85
86
87 void oopDesc::verify(oopDesc* oop_desc) {
88 verify_on(tty, oop_desc);
89 }
90
91 intptr_t oopDesc::slow_identity_hash() {
92 // slow case; we have to acquire the micro lock in order to locate the header
93 Thread* THREAD = Thread::current();
94 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
95 HandleMark hm(THREAD);
96 Handle object(THREAD, this);
97 return ObjectSynchronizer::identity_hash_value_for(object);
98 }
99
100 // When String table needs to rehash
101 unsigned int oopDesc::new_hash(juint seed) {
102 EXCEPTION_MARK;
103 ResourceMark rm;
104 int length;
105 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
106 if (chars != NULL) {
107 // Use alternate hashing algorithm on the string
108 return AltHashing::murmur3_32(seed, chars, length);
109 } else {
110 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
111 return 0;
112 }
113 }
114
115 // used only for asserts and guarantees
116 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
117 if (!Universe::heap()->is_oop(obj)) {
118 return false;
119 }
120
121 // Header verification: the mark is typically non-NULL. If we're
122 // at a safepoint, it must not be null.
123 // Outside of a safepoint, the header could be changing (for example,
124 // another thread could be inflating a lock on this object).
125 if (ignore_mark_word) {
126 return true;
127 }
128 if (obj->mark_raw() != NULL) {
129 return true;
130 }
131 return !SafepointSynchronize::is_at_safepoint();
132 }
133
134 // used only for asserts and guarantees
135 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
136 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
137 }
138
139 #ifndef PRODUCT
140 // used only for asserts
141 bool oopDesc::is_unlocked_oop() const {
142 if (!Universe::heap()->is_in_reserved(this)) return false;
143 return mark()->is_unlocked();
144 }
145
146 #if INCLUDE_CDS_JAVA_HEAP
147 bool oopDesc::is_archived_object(oop p) {
148 return HeapShared::is_archived_object(p);
149 }
150 #endif
151 #endif // PRODUCT
152
153 VerifyOopClosure VerifyOopClosure::verify_oop;
154
155 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
156 oop obj = RawAccess<>::oop_load(p);
157 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
158 }
159
160 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
161 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
162
163 // type test operations that doesn't require inclusion of oop.inline.hpp.
164 bool oopDesc::is_instance_noinline() const { return is_instance(); }
165 bool oopDesc::is_array_noinline() const { return is_array(); }
166 bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
167 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
168
169 bool oopDesc::has_klass_gap() {
170 // Only has a klass gap when compressed class pointers are used.
171 return UseCompressedClassPointers;
172 }
173
174 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
175
176 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); }
177 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
178 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
179
180 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
181 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
182
183 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); }
184 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
185
186 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
187 Metadata* oopDesc::metadata_field_raw(int offset) const { return RawAccess<>::load_at(as_oop(), offset); }
188 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); }
189
190 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
191 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
192
193 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
194 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
195
196 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
197 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
198
199 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
200 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }
201
202 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
203 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
204
205 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
206 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
207
208 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
209 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
210
211 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
212 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
213
214 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
215 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }