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 void oopDesc::print_on(outputStream* st) const {
41 if (this == NULL) {
42 st->print_cr("NULL");
43 } else {
44 klass()->oop_print_on(oop(this), st);
45 }
46 }
47
48 void oopDesc::print_address_on(outputStream* st) const {
49 st->print("{" INTPTR_FORMAT "}", p2i(this));
50
51 }
52
53 void oopDesc::print() { print_on(tty); }
54
55 void oopDesc::print_address() { print_address_on(tty); }
56
57 char* oopDesc::print_string() {
58 stringStream st;
59 print_on(&st);
60 return st.as_string();
61 }
62
63 void oopDesc::print_value() {
64 print_value_on(tty);
65 }
66
67 char* oopDesc::print_value_string() {
68 char buf[100];
69 stringStream st(buf, sizeof(buf));
70 print_value_on(&st);
71 return st.as_string();
72 }
73
74 void oopDesc::print_value_on(outputStream* st) const {
75 oop obj = oop(this);
76 if (this == NULL) {
77 st->print("NULL");
78 } else if (java_lang_String::is_instance(obj)) {
79 java_lang_String::print(obj, st);
80 print_address_on(st);
81 } else {
82 klass()->oop_print_value_on(obj, st);
83 }
84 }
85
86
87 void oopDesc::verify_on(outputStream* st) {
88 if (this != NULL) {
89 klass()->oop_verify_on(this, st);
90 }
91 }
92
93
94 void oopDesc::verify() {
95 verify_on(tty);
96 }
97
98 intptr_t oopDesc::slow_identity_hash() {
99 // slow case; we have to acquire the micro lock in order to locate the header
100 Thread* THREAD = Thread::current();
101 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY
102 HandleMark hm(THREAD);
103 Handle object(THREAD, this);
104 return ObjectSynchronizer::FastHashCode(THREAD, object());
105 }
106
107 // When String table needs to rehash
108 unsigned int oopDesc::new_hash(juint seed) {
109 EXCEPTION_MARK;
110 ResourceMark rm;
111 int length;
112 jchar* chars = java_lang_String::as_unicode_string(this, length, THREAD);
113 if (chars != NULL) {
114 // Use alternate hashing algorithm on the string
115 return AltHashing::murmur3_32(seed, chars, length);
116 } else {
117 vm_exit_out_of_memory(length, OOM_MALLOC_ERROR, "unable to create Unicode strings for String table rehash");
118 return 0;
119 }
120 }
121
122 // used only for asserts and guarantees
123 bool oopDesc::is_oop(oop obj, bool ignore_mark_word) {
124 if (!check_obj_alignment(obj)) return false;
125 if (!Universe::heap()->is_in_reserved(obj)) {
126 assert(obj->klass()->is_value(), "Only value type can be outside of the Java heap");
127 VTBufferChunk* chunk = VTBufferChunk::chunk(obj);
128 assert(chunk->is_valid(), "if not in the heap, should a buffered VT");
129 if (!VTBuffer::is_in_vt_buffer(obj)) return false;
130 }
131 // obj is aligned and accessible in heap
132 if (Universe::heap()->is_in_reserved(obj->klass_or_null())) return false;
133
134 // Header verification: the mark is typically non-NULL. If we're
135 // at a safepoint, it must not be null.
136 // Outside of a safepoint, the header could be changing (for example,
137 // another thread could be inflating a lock on this object).
138 if (ignore_mark_word) {
139 return true;
140 }
141 if (obj->mark() != NULL) {
142 return true;
143 }
144 return !SafepointSynchronize::is_at_safepoint()
145 || (obj->klass()->is_value() && VTBuffer::is_in_vt_buffer(obj)) ;
146 }
147
148 // used only for asserts and guarantees
149 bool oopDesc::is_oop_or_null(oop obj, bool ignore_mark_word) {
150 return obj == NULL ? true : is_oop(obj, ignore_mark_word);
151 }
152
153 #ifndef PRODUCT
154 // used only for asserts
155 bool oopDesc::is_unlocked_oop() const {
156 if (!Universe::heap()->is_in_reserved(this)) return false;
157 return mark()->is_unlocked();
158 }
159 #endif // PRODUCT
160
161 VerifyOopClosure VerifyOopClosure::verify_oop;
162
163 template <class T> void VerifyOopClosure::do_oop_work(T* p) {
164 oop obj = oopDesc::load_decode_heap_oop(p);
165 guarantee(oopDesc::is_oop_or_null(obj), "invalid oop: " INTPTR_FORMAT, p2i((oopDesc*) obj));
166 }
167
168 void VerifyOopClosure::do_oop(oop* p) { VerifyOopClosure::do_oop_work(p); }
169 void VerifyOopClosure::do_oop(narrowOop* p) { VerifyOopClosure::do_oop_work(p); }
170
171 // type test operations that doesn't require inclusion of oop.inline.hpp.
172 bool oopDesc::is_instance_noinline() const { return is_instance(); }
173 bool oopDesc::is_array_noinline() const { return is_array(); }
174 bool oopDesc::is_objArray_noinline() const { return is_objArray(); }
175 bool oopDesc::is_typeArray_noinline() const { return is_typeArray(); }
176 bool oopDesc::is_value_noinline() const { return is_value(); }
177 bool oopDesc::is_valueArray_noinline() const { return is_valueArray(); }
178
179 bool oopDesc::has_klass_gap() {
180 // Only has a klass gap when compressed class pointers are used.
181 return UseCompressedClassPointers;
182 }
183
184 oop oopDesc::obj_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::oop_load_at(as_oop(), offset); }
185
186 void oopDesc::obj_field_put_raw(int offset, oop value) { RawAccess<>::oop_store_at(as_oop(), offset, value); }
187 void oopDesc::release_obj_field_put(int offset, oop value) { HeapAccess<MO_RELEASE>::oop_store_at(as_oop(), offset, value); }
188 void oopDesc::obj_field_put_volatile(int offset, oop value) { HeapAccess<MO_SEQ_CST>::oop_store_at(as_oop(), offset, value); }
189
190 address oopDesc::address_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
191 address oopDesc::address_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
192
193 void oopDesc::address_field_put(int offset, address value) { HeapAccess<>::store_at(as_oop(), offset, value); }
194 void oopDesc::release_address_field_put(int offset, address value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
195
196 Metadata* oopDesc::metadata_field(int offset) const { return HeapAccess<>::load_at(as_oop(), offset); }
197 void oopDesc::metadata_field_put(int offset, Metadata* value) { HeapAccess<>::store_at(as_oop(), offset, value); }
198
199 Metadata* oopDesc::metadata_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
200 void oopDesc::release_metadata_field_put(int offset, Metadata* value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
201
202 jbyte oopDesc::byte_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
203 void oopDesc::release_byte_field_put(int offset, jbyte value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
204
205 jchar oopDesc::char_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
206 void oopDesc::release_char_field_put(int offset, jchar value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
207
208 jboolean oopDesc::bool_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
209 void oopDesc::release_bool_field_put(int offset, jboolean value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, jboolean(value & 1)); }
210
211 jint oopDesc::int_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
212 void oopDesc::release_int_field_put(int offset, jint value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
213
214 jshort oopDesc::short_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
215 void oopDesc::release_short_field_put(int offset, jshort value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
216
217 jlong oopDesc::long_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
218 void oopDesc::release_long_field_put(int offset, jlong value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
219
220 jfloat oopDesc::float_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
221 void oopDesc::release_float_field_put(int offset, jfloat value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
222
223 jdouble oopDesc::double_field_acquire(int offset) const { return HeapAccess<MO_ACQUIRE>::load_at(as_oop(), offset); }
224 void oopDesc::release_double_field_put(int offset, jdouble value) { HeapAccess<MO_RELEASE>::store_at(as_oop(), offset, value); }
225
226 #if INCLUDE_CDS_JAVA_HEAP
227 bool oopDesc::is_archive_object(oop p) {
228 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p);
229 }
230 #endif