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