1 /*
2 * Copyright (c) 1997, 2017, 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/oop.inline.hpp"
30 #include "oops/verifyOopClosure.hpp"
31 #include "runtime/handles.inline.hpp"
32 #include "runtime/thread.inline.hpp"
33 #include "utilities/copy.hpp"
34 #if INCLUDE_ALL_GCS
35 #include "gc/g1/g1Allocator.inline.hpp"
36 #endif
37
38 bool always_do_update_barrier = false;
39
40 bool oopDesc::equals(oop o1, oop o2) {
41 return Access<>::equals(o1, o2);
42 }
43
44 void oopDesc::print_on(outputStream* st) const {
45 if (this == NULL) {
46 st->print_cr("NULL");
47 } else {
48 klass()->oop_print_on(oop(this), st);
49 }
50 }
51
52 void oopDesc::print_address_on(outputStream* st) const {
53 st->print("{" INTPTR_FORMAT "}", p2i(this));
54
55 }
56
57 void oopDesc::print() { print_on(tty); }
58
59 void oopDesc::print_address() { print_address_on(tty); }
60
61 char* oopDesc::print_string() {
62 stringStream st;
63 print_on(&st);
64 return st.as_string();
65 }
66
67 void oopDesc::print_value() {
68 print_value_on(tty);
69 }
70
71 char* oopDesc::print_value_string() {
72 char buf[100];
73 stringStream st(buf, sizeof(buf));
74 print_value_on(&st);
75 return st.as_string();
76 }
77
78 void oopDesc::print_value_on(outputStream* st) const {
79 oop obj = oop(this);
80 if (this == NULL) {
81 st->print("NULL");
82 } else if (java_lang_String::is_instance(obj)) {
83 java_lang_String::print(obj, st);
84 print_address_on(st);
85 } else {
86 klass()->oop_print_value_on(obj, st);
87 }
88 }
89
90
91 void oopDesc::verify_on(outputStream* st) {
92 if (this != NULL) {
93 klass()->oop_verify_on(this, st);
94 }
95 }
96
97
98 void oopDesc::verify() {
99 verify_on(tty);
100 }
101
102 intptr_t oopDesc::slow_identity_hash() {
103 // slow case; we have to acquire the micro lock in order to locate the header
104 Thread* THREAD = Thread::current();
105 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
106 HandleMark hm(THREAD);
107 Handle object(THREAD, this);
108 return ObjectSynchronizer::identity_hash_value_for(object);
109 }
110
111 // When String table needs to rehash
112 unsigned int oopDesc::new_hash(juint seed) {
113 EXCEPTION_MARK;
114 ResourceMark rm;
115 int length;
116 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
117 if (chars != NULL) {
118 // Use alternate hashing algorithm on the string
119 return AltHashing::murmur3_32(seed, chars, length);
120 } else {
121 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
122 return 0;
123 }
124 }
125
126 // used only for asserts and guarantees
127 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
128 if (!check_obj_alignment(obj)) return false;
129 if (!Universe::heap()->is_in_reserved(obj)) return false;
130 // obj is aligned and accessible in heap
131 if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;
132
133 // Header verification: the mark is typically non-NULL. If we're
134 // at a safepoint, it must not be null.
135 // Outside of a safepoint, the header could be changing (for example,
136 // another thread could be inflating a lock on this object).
137 if (ignore_mark_word) {
138 return true;
139 }
140 if (obj->mark() != NULL) {
141 return true;
142 }
143 return !SafepointSynchronize::is_at_safepoint();
144 }
145
146 // used only for asserts and guarantees
147 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
148 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
149 }
150
151 #ifndef PRODUCT
152 // used only for asserts
153 bool oopDesc::is_unlocked_oop() const {
154 if (!Universe::heap()->is_in_reserved(this)) return false;
155 return mark()->is_unlocked();
156 }
157 #endif // PRODUCT
158
159 VerifyOopClosure VerifyOopClosure::verify_oop;
160
161 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
162 oop obj = oopDesc::load_decode_heap_oop(p);
163 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
164 }
165
166 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
167 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
168
169 // type test operations that doesn't require inclusion of oop.inline.hpp.
170 bool oopDesc::is_instance_noinline() const { return is_instance(); }
171 bool oopDesc::is_array_noinline() const { return is_array(); }
172 bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
173 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
174
175 bool oopDesc::has_klass_gap() {
176 // Only has a klass gap when compressed class pointers are used.
177 return UseCompressedClassPointers;
178 }
179
180 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
181
182 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); }
183 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
184 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
185
186 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
187 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
188
189 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); }
190 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
191
192 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
193 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); }
194
195 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
196 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
197
198 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
199 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
200
201 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
202 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
203
204 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
205 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }
206
207 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
208 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
209
210 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
211 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
212
213 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
214 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
215
216 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
217 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
218
219 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
220 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
221
222 #if INCLUDE_CDS_JAVA_HEAP
223 bool oopDesc::is_archive_object(oop p) {
224 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p);
225 }
226 #endif