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 "classfile/altHashing.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "gc/shared/collectedHeap.inline.hpp"
29 #include "gc/shared/gc_globals.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "memory/universe.hpp"
32 #include "oops/access.inline.hpp"
33 #include "oops/compressedOops.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "oops/verifyOopClosure.hpp"
36 #include "runtime/handles.inline.hpp"
37 #include "runtime/thread.inline.hpp"
38 #include "utilities/copy.hpp"
39 #include "utilities/macros.hpp"
40
41 void oopDesc::print_on(outputStream* st) const {
42 klass()->oop_print_on(const_cast<oopDesc*>(this), st);
43 }
44
45 void oopDesc::print_address_on(outputStream* st) const {
46 st->print("{" INTPTR_FORMAT "}", p2i(this));
47
48 }
49
50 void oopDesc::print() { print_on(tty); }
51
52 void oopDesc::print_address() { print_address_on(tty); }
53
54 char* oopDesc::print_string() {
55 stringStream st;
56 print_on(&st);
57 return st.as_string();
58 }
59
60 void oopDesc::print_value() {
61 print_value_on(tty);
62 }
63
64 char* 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
71 void oopDesc::print_value_on(outputStream* st) const {
72 oop obj = const_cast<oopDesc*>(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
82 void 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
89 void oopDesc::verify(oopDesc* oop_desc) {
90 verify_on(tty, oop_desc);
91 }
92
93 intptr_t oopDesc::slow_identity_hash() {
94 // slow case; we have to acquire the micro lock in order to locate the header
95 Thread* current = Thread::current();
96 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
97 HandleMark hm(current);
98 Handle object(current, this);
99 return ObjectSynchronizer::FastHashCode(current, object());
100 }
101
102 // used only for asserts and guarantees
103 bool 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-zero. If we're
109 // at a safepoint, it must not be zero.
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().value() != 0) {
116 return true;
117 }
118 return !SafepointSynchronize::is_at_safepoint() ;
119 }
120
121 // used only for asserts and guarantees
122 bool 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 VerifyOopClosure VerifyOopClosure::verify_oop;
127
128 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
129 oop obj = RawAccess<>::oop_load(p);
130 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
131 }
132
133 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
134 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
135
136 // type test operations that doesn't require inclusion of oop.inline.hpp.
137 bool oopDesc::is_instance_noinline() const { return is_instance(); }
138 bool oopDesc::is_array_noinline() const { return is_array(); }
139 bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
140 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
141 bool oopDesc::is_flatArray_noinline() const { return is_flatArray(); }
142 bool oopDesc::is_null_free_array_noinline() const { return is_null_free_array(); }
143
144 bool oopDesc::has_klass_gap() {
145 // Only has a klass gap when compressed class pointers are used.
146 return UseCompressedClassPointers;
147 }
148
149 #if INCLUDE_CDS_JAVA_HEAP
150 void oopDesc::set_narrow_klass(narrowKlass nk) {
151 assert(DumpSharedSpaces, "Used by CDS only. Do not abuse!");
152 assert(UseCompressedClassPointers, "must be");
153 _metadata._compressed_klass = nk;
154 }
155 #endif
156
157 void* oopDesc::load_klass_raw(oop obj) {
158 if (UseCompressedClassPointers) {
159 narrowKlass narrow_klass = obj->_metadata._compressed_klass;
160 if (narrow_klass == 0) return NULL;
161 return (void*)CompressedKlassPointers::decode_raw(narrow_klass);
162 } else {
163 return obj->_metadata._klass;
164 }
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 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); }
192
193 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
194 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
195
196 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
197 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
198
199 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
200 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
201
202 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
203 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }
204
205 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
206 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
207
208 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
209 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
210
211 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
212 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
213
214 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
215 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
216
217 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
218 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
219
220 #ifdef ASSERT
221 void oopDesc::verify_forwardee(oop forwardee) {
222 #if INCLUDE_CDS_JAVA_HEAP
223 assert(!Universe::heap()->is_archived_object(forwardee) && !Universe::heap()->is_archived_object(this),
224 "forwarding archive object");
225 #endif
226 }
227
228 bool oopDesc::get_UseParallelGC() { return UseParallelGC; }
229 bool oopDesc::get_UseG1GC() { return UseG1GC; }
230 #endif