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
39bool always_do_update_barrier = false;
40
41void oopDesc::print_on(outputStream* st) const {
42 klass()->oop_print_on(oop(this), st);
43}
44
45void oopDesc::print_address_on(outputStream* st) const {
46 st->print("{" INTPTR_FORMAT "}", p2i(this));
47
48}
49
50void oopDesc::print() { print_on(tty); }
51
52void oopDesc::print_address() { print_address_on(tty); }
53
54char* oopDesc::print_string() {
55 stringStream st;
56 print_on(&st);
57 return st.as_string();
58}
59
60void oopDesc::print_value() {
61 print_value_on(tty);
62}
63
64char* oopDesc::print_value_string() {
65 char buf[100];
66 stringStream st(buf, sizeof(buf));
67 print_value_on(&st);
68 return st.as_string();
69}
70
71void oopDesc::print_value_on(outputStream* st) const {
72 oop obj = oop(this);
73 if (java_lang_String::is_instance(obj)) {
74 java_lang_String::print(obj, st);
75 print_address_on(st);
76 } else {
77 klass()->oop_print_value_on(obj, st);
78 }
79}
80
81
82void oopDesc::verify_on(outputStream* st, oopDesc* oop_desc) {
83 if (oop_desc != NULL) {
84 oop_desc->klass()->oop_verify_on(oop_desc, st);
85 }
86}
87
88
89void oopDesc::verify(oopDesc* oop_desc) {
90 verify_on(tty, oop_desc);
91}
92
93intptr_t oopDesc::slow_identity_hash() {
94 // slow case; we have to acquire the micro lock in order to locate the header
95 Thread* THREAD = Thread::current();
96 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
97 HandleMark hm(THREAD);
98 Handle object(THREAD, this);
99 return ObjectSynchronizer::identity_hash_value_for(object);
100}
101
102// used only for asserts and guarantees
103bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
104 if (!Universe::heap()->is_oop(obj)) {
105 return false;
106 }
107
108 // Header verification: the mark is typically non-NULL. If we're
109 // at a safepoint, it must not be null.
110 // Outside of a safepoint, the header could be changing (for example,
111 // another thread could be inflating a lock on this object).
112 if (ignore_mark_word) {
113 return true;
114 }
115 if (obj->mark_raw() != NULL) {
116 return true;
117 }
118 return !SafepointSynchronize::is_at_safepoint();
119}
120
121// used only for asserts and guarantees
122bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
123 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
124}
125
126#ifndef PRODUCT
127#if INCLUDE_CDS_JAVA_HEAP
128bool oopDesc::is_archived_object(oop p) {
129 return HeapShared::is_archived_object(p);
130}
131#endif
132#endif // PRODUCT
133
134VerifyOopClosure VerifyOopClosure::verify_oop;
135
136template <class T> void VerifyOopClosure::do_oop_work(T* p) {
137 oop obj = RawAccess<>::oop_load(p);
138 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
139}
140
141void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
142void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
143
144// type test operations that doesn't require inclusion of oop.inline.hpp.
145bool oopDesc::is_instance_noinline() const { return is_instance(); }
146bool oopDesc::is_array_noinline() const { return is_array(); }
147bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
148bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
149
150bool oopDesc::has_klass_gap() {
151 // Only has a klass gap when compressed class pointers are used.
152 return UseCompressedClassPointers;
153}
154
155void* oopDesc::load_klass_raw(oop obj) {
156 if (UseCompressedClassPointers) {
157 narrowKlass narrow_klass = *(obj->compressed_klass_addr());
158 if (narrow_klass == 0) return NULL;
159 return (void*)CompressedKlassPointers::decode_raw(narrow_klass);
160 } else {
161 return *(void**)(obj->klass_addr());
162 }
163}
164
165void* oopDesc::load_oop_raw(oop obj, int offset) {
166 uintptr_t addr = (uintptr_t)(void*)obj + (uint)offset;
167 if (UseCompressedOops) {
168 narrowOop narrow_oop = *(narrowOop*)addr;
169 if (narrow_oop == 0) return NULL;
170 return (void*)CompressedOops::decode_raw(narrow_oop);
171 } else {
172 return *(void**)addr;
173 }
174}
175
176bool oopDesc::is_valid(oop obj) {
177 if (!is_object_aligned(obj)) return false;
178 if ((size_t)(oopDesc*)obj < os::min_page_size()) return false;
179
180 // We need at least the mark and the klass word in the committed region.
181 if (!os::is_readable_range(obj, (oopDesc*)obj + 1)) return false;
182 if (!Universe::heap()->is_in(obj)) return false;
183
184 Klass* k = (Klass*)load_klass_raw(obj);
185 return Klass::is_valid(k);
186}
187
188oop oopDesc::oop_or_null(address addr) {
189 if (is_valid(oop(addr))) {
190 // We were just given an oop directly.
191 return oop(addr);
192 }
193
194 // Try to find addr using block_start.
195 HeapWord* p = Universe::heap()->block_start(addr);
196 if (p != NULL && Universe::heap()->block_is_obj(p)) {
197 if (!is_valid(oop(p))) return NULL;
198 return oop(p);
199 }
200
201 // If we can't find it it just may mean that heap wasn't parsable.
202 return NULL;
203}
204
205oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
206
207void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); }
208void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
209void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
210
211address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
212address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
213
214void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); }
215void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
216
217Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
218Metadata* oopDesc::metadata_field_raw(int offset) const { return RawAccess<>::load_at(as_oop(), offset); }
219void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); }
220
221Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
222void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
223
224jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
225void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
226
227jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
228void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
229
230jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
231void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }
232
233jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
234void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
235
236jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
237void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
238
239jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
240void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
241
242jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
243void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
244
245jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
246void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
247