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