1 /*
2 * Copyright (c) 1997, 2021, 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 "cds/heapShared.inline.hpp"
27 #include "classfile/altHashing.hpp"
28 #include "classfile/javaClasses.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 #include "utilities/macros.hpp"
39
40 void oopDesc::print_on(outputStream* st) const {
41 klass()->oop_print_on(const_cast<oopDesc*>(this), st);
42 }
43
44 void oopDesc::print_address_on(outputStream* st) const {
45 st->print("{" INTPTR_FORMAT "}", p2i(this));
46
47 }
48
49 void oopDesc::print() { print_on(tty); }
50
51 void oopDesc::print_address() { print_address_on(tty); }
52
53 char* oopDesc::print_string() {
54 stringStream st;
55 print_on(&st);
56 return st.as_string();
57 }
58
59 void oopDesc::print_value() {
60 print_value_on(tty);
61 }
62
63 char* oopDesc::print_value_string() {
64 char buf[100];
65 stringStream st(buf, sizeof(buf));
66 print_value_on(&st);
67 return st.as_string();
68 }
69
70 void oopDesc::print_value_on(outputStream* st) const {
71 oop obj = const_cast<oopDesc*>(this);
72 if (java_lang_String::is_instance(obj)) {
73 java_lang_String::print(obj, st);
74 print_address_on(st);
75 } else {
76 klass()->oop_print_value_on(obj, st);
77 }
78 }
79
80
81 void oopDesc::verify_on(outputStream* st, oopDesc* oop_desc) {
82 if (oop_desc != NULL) {
83 oop_desc->klass()->oop_verify_on(oop_desc, st);
84 }
85 }
86
87
88 void oopDesc::verify(oopDesc* oop_desc) {
89 verify_on(tty, oop_desc);
90 }
91
92 intptr_t oopDesc::slow_identity_hash() {
93 // slow case; we have to acquire the micro lock in order to locate the header
94 Thread* current = Thread::current();
95 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
96 HandleMark hm(current);
97 Handle object(current, this);
98 return ObjectSynchronizer::identity_hash_value_for(object);
99 }
100
101 // used only for asserts and guarantees
102 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
103 if (!Universe::heap()->is_oop(obj)) {
104 return false;
105 }
106
107 // Header verification: the mark is typically non-zero. If we're
108 // at a safepoint, it must not be zero, except when using the new lightweight locking.
109 // Outside of a safepoint, the header could be changing (for example,
110 // another thread could be inflating a lock on this object).
111 if (ignore_mark_word) {
112 return true;
113 }
114 if (obj->mark().value() != 0) {
115 return true;
116 }
117 return LockingMode == LM_LIGHTWEIGHT || !SafepointSynchronize::is_at_safepoint();
118 }
119
120 // used only for asserts and guarantees
121 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
122 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
123 }
124
125 VerifyOopClosure VerifyOopClosure::verify_oop;
126
127 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
128 oop obj = RawAccess<>::oop_load(p);
129 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
130 }
131
132 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
133 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
134
135 // type test operations that doesn't require inclusion of oop.inline.hpp.
136 bool oopDesc::is_instance_noinline() const { return is_instance(); }
137 bool oopDesc::is_array_noinline() const { return is_array(); }
138 bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
139 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
140
141 bool oopDesc::has_klass_gap() {
142 // Only has a klass gap when compressed class pointers are used, but
143 // only if not using compact headers..
144 return UseCompressedClassPointers && !UseCompactObjectHeaders;
145 }
146
147 #if INCLUDE_CDS_JAVA_HEAP
148 void oopDesc::set_narrow_klass(narrowKlass nk) {
149 assert(DumpSharedSpaces, "Used by CDS only. Do not abuse!");
150 assert(UseCompressedClassPointers, "must be");
151 assert(!UseCompactObjectHeaders, "not with compact headers");
152 _metadata._compressed_klass = nk;
153 }
154 #endif
155
156 void* oopDesc::load_klass_raw(oop obj) {
157 // TODO: Remove method altogether and replace with calls to obj->klass() ?
158 // OTOH, we may eventually get rid of locking in header, and then no
159 // longer have to deal with that anymore.
160 #ifdef _LP64
161 return obj->klass();
162 #else
163 return obj->_metadata._klass;
164 #endif
165 }
166
167 void* oopDesc::load_oop_raw(oop obj, int offset) {
168 uintptr_t addr = (uintptr_t)(void*)obj + (uint)offset;
169 if (UseCompressedOops) {
170 narrowOop narrow_oop = *(narrowOop*)addr;
171 if (CompressedOops::is_null(narrow_oop)) return NULL;
172 return (void*)CompressedOops::decode_raw(narrow_oop);
173 } else {
174 return *(void**)addr;
175 }
176 }
177
178 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
179
180 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); }
181 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
182 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
183
184 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
185 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
186
187 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); }
188 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
189
190 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
191 Metadata* oopDesc::metadata_field_raw(int offset) const { return RawAccess<>::load_at(as_oop(), offset); }
192 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); }
193
194 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
195 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
196
197 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
198 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
199
200 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
201 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
202
203 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
204 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }
205
206 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
207 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
208
209 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
210 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
211
212 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
213 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
214
215 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
216 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
217
218 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
219 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
220
221 #ifdef ASSERT
222 void oopDesc::verify_forwardee(oop forwardee) {
223 #if INCLUDE_CDS_JAVA_HEAP
224 assert(!HeapShared::is_archived_object(forwardee) && !HeapShared::is_archived_object(this),
225 "forwarding archive object");
226 #endif
227 }
228
229 bool oopDesc::get_UseParallelGC() { return UseParallelGC; }
230 bool oopDesc::get_UseG1GC() { return UseG1GC; }
231 #endif