1 /*
2 * Copyright (c) 2017, 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 #ifndef SHARE_VM_RUNTIME_ACCESSBACKEND_INLINE_HPP
26 #define SHARE_VM_RUNTIME_ACCESSBACKEND_INLINE_HPP
27
28 #include "oops/access.hpp"
29 #include "oops/accessBackend.hpp"
30 #include "oops/compressedOops.inline.hpp"
31 #include "oops/oopsHierarchy.hpp"
32
33 template <DecoratorSet decorators>
34 template <DecoratorSet idecorators, typename T>
35 inline typename EnableIf<
36 AccessInternal::MustConvertCompressedOop<idecorators, T>::value, T>::type
37 RawAccessBarrier<decorators>::decode_internal(typename HeapOopType<idecorators>::type value) {
38 if (HasDecorator<decorators, OOP_NOT_NULL>::value) {
39 return CompressedOops::decode_not_null(value);
40 } else {
41 return CompressedOops::decode(value);
42 }
43 }
44
45 template <DecoratorSet decorators>
46 template <DecoratorSet idecorators, typename T>
47 inline typename EnableIf<
48 AccessInternal::MustConvertCompressedOop<idecorators, T>::value,
49 typename HeapOopType<idecorators>::type>::type
50 RawAccessBarrier<decorators>::encode_internal(T value) {
51 if (HasDecorator<decorators, OOP_NOT_NULL>::value) {
52 return CompressedOops::encode_not_null(value);
53 } else {
54 return CompressedOops::encode(value);
55 }
56 }
57
58 template <DecoratorSet decorators>
59 template <typename T>
60 inline void RawAccessBarrier<decorators>::oop_store(void* addr, T value) {
61 typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;
62 Encoded encoded = encode(value);
63 store(reinterpret_cast<Encoded*>(addr), encoded);
64 }
65
66 template <DecoratorSet decorators>
67 template <typename T>
68 inline void RawAccessBarrier<decorators>::oop_store_at(oop base, ptrdiff_t offset, T value) {
69 oop_store(field_addr(base, offset), value);
70 }
71
72 template <DecoratorSet decorators>
73 template <typename T>
74 inline T RawAccessBarrier<decorators>::oop_load(void* addr) {
75 typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;
76 Encoded encoded = load<Encoded>(reinterpret_cast<Encoded*>(addr));
77 return decode<T>(encoded);
78 }
79
80 template <DecoratorSet decorators>
81 template <typename T>
82 inline T RawAccessBarrier<decorators>::oop_load_at(oop base, ptrdiff_t offset) {
83 return oop_load<T>(field_addr(base, offset));
84 }
85
86 template <DecoratorSet decorators>
87 template <typename T>
88 inline T RawAccessBarrier<decorators>::oop_atomic_cmpxchg(T new_value, void* addr, T compare_value) {
89 typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;
90 Encoded encoded_new = encode(new_value);
91 Encoded encoded_compare = encode(compare_value);
92 Encoded encoded_result = atomic_cmpxchg(encoded_new,
93 reinterpret_cast<Encoded*>(addr),
94 encoded_compare);
95 return decode<T>(encoded_result);
96 }
97
98 template <DecoratorSet decorators>
99 template <typename T>
100 inline T RawAccessBarrier<decorators>::oop_atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
101 return oop_atomic_cmpxchg(new_value, field_addr(base, offset), compare_value);
102 }
103
104 template <DecoratorSet decorators>
105 template <typename T>
106 inline T RawAccessBarrier<decorators>::oop_atomic_xchg(T new_value, void* addr) {
107 typedef typename AccessInternal::EncodedType<decorators, T>::type Encoded;
108 Encoded encoded_new = encode(new_value);
109 Encoded encoded_result = atomic_xchg(encoded_new, reinterpret_cast<Encoded*>(addr));
110 return decode<T>(encoded_result);
111 }
112
113 template <DecoratorSet decorators>
114 template <typename T>
115 inline T RawAccessBarrier<decorators>::oop_atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
116 return oop_atomic_xchg(new_value, field_addr(base, offset));
117 }
118
119 template <DecoratorSet decorators>
120 template <typename T>
121 inline bool RawAccessBarrier<decorators>::oop_arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
122 return arraycopy(src_obj, dst_obj, src, dst, length);
123 }
124
125 template <DecoratorSet decorators>
126 template <DecoratorSet ds, typename T>
127 inline typename EnableIf<
128 HasDecorator<ds, MO_SEQ_CST>::value, T>::type
129 RawAccessBarrier<decorators>::load_internal(void* addr) {
130 if (support_IRIW_for_not_multiple_copy_atomic_cpu) {
131 OrderAccess::fence();
132 }
133 return OrderAccess::load_acquire(reinterpret_cast<const volatile T*>(addr));
134 }
135
136 template <DecoratorSet decorators>
137 template <DecoratorSet ds, typename T>
138 inline typename EnableIf<
139 HasDecorator<ds, MO_ACQUIRE>::value, T>::type
140 RawAccessBarrier<decorators>::load_internal(void* addr) {
141 return OrderAccess::load_acquire(reinterpret_cast<const volatile T*>(addr));
142 }
143
144 template <DecoratorSet decorators>
145 template <DecoratorSet ds, typename T>
146 inline typename EnableIf<
147 HasDecorator<ds, MO_RELAXED>::value, T>::type
148 RawAccessBarrier<decorators>::load_internal(void* addr) {
149 return Atomic::load(reinterpret_cast<const volatile T*>(addr));
150 }
151
152 template <DecoratorSet decorators>
153 template <DecoratorSet ds, typename T>
154 inline typename EnableIf<
155 HasDecorator<ds, MO_SEQ_CST>::value>::type
156 RawAccessBarrier<decorators>::store_internal(void* addr, T value) {
157 OrderAccess::release_store_fence(reinterpret_cast<volatile T*>(addr), value);
158 }
159
160 template <DecoratorSet decorators>
161 template <DecoratorSet ds, typename T>
162 inline typename EnableIf<
163 HasDecorator<ds, MO_RELEASE>::value>::type
164 RawAccessBarrier<decorators>::store_internal(void* addr, T value) {
165 OrderAccess::release_store(reinterpret_cast<volatile T*>(addr), value);
166 }
167
168 template <DecoratorSet decorators>
169 template <DecoratorSet ds, typename T>
170 inline typename EnableIf<
171 HasDecorator<ds, MO_RELAXED>::value>::type
172 RawAccessBarrier<decorators>::store_internal(void* addr, T value) {
173 Atomic::store(value, reinterpret_cast<volatile T*>(addr));
174 }
175
176 template <DecoratorSet decorators>
177 template <DecoratorSet ds, typename T>
178 inline typename EnableIf<
179 HasDecorator<ds, MO_RELAXED>::value, T>::type
180 RawAccessBarrier<decorators>::atomic_cmpxchg_internal(T new_value, void* addr, T compare_value) {
181 return Atomic::cmpxchg(new_value,
182 reinterpret_cast<volatile T*>(addr),
183 compare_value,
184 memory_order_relaxed);
185 }
186
187 template <DecoratorSet decorators>
188 template <DecoratorSet ds, typename T>
189 inline typename EnableIf<
190 HasDecorator<ds, MO_SEQ_CST>::value, T>::type
191 RawAccessBarrier<decorators>::atomic_cmpxchg_internal(T new_value, void* addr, T compare_value) {
192 return Atomic::cmpxchg(new_value,
193 reinterpret_cast<volatile T*>(addr),
194 compare_value,
195 memory_order_conservative);
196 }
197
198 template <DecoratorSet decorators>
199 template <DecoratorSet ds, typename T>
200 inline typename EnableIf<
201 HasDecorator<ds, MO_SEQ_CST>::value, T>::type
202 RawAccessBarrier<decorators>::atomic_xchg_internal(T new_value, void* addr) {
203 return Atomic::xchg(new_value,
204 reinterpret_cast<volatile T*>(addr));
205 }
206
207 // For platforms that do not have native support for wide atomics,
208 // we can emulate the atomicity using a lock. So here we check
209 // whether that is necessary or not.
210
211 template <DecoratorSet ds>
212 template <DecoratorSet decorators, typename T>
213 inline typename EnableIf<
214 AccessInternal::PossiblyLockedAccess<T>::value, T>::type
215 RawAccessBarrier<ds>::atomic_xchg_maybe_locked(T new_value, void* addr) {
216 if (!AccessInternal::wide_atomic_needs_locking()) {
217 return atomic_xchg_internal<ds>(new_value, addr);
218 } else {
219 AccessInternal::AccessLocker access_lock;
220 volatile T* p = reinterpret_cast<volatile T*>(addr);
221 T old_val = RawAccess<>::load(p);
222 RawAccess<>::store(p, new_value);
223 return old_val;
224 }
225 }
226
227 template <DecoratorSet ds>
228 template <DecoratorSet decorators, typename T>
229 inline typename EnableIf<
230 AccessInternal::PossiblyLockedAccess<T>::value, T>::type
231 RawAccessBarrier<ds>::atomic_cmpxchg_maybe_locked(T new_value, void* addr, T compare_value) {
232 if (!AccessInternal::wide_atomic_needs_locking()) {
233 return atomic_cmpxchg_internal<ds>(new_value, addr, compare_value);
234 } else {
235 AccessInternal::AccessLocker access_lock;
236 volatile T* p = reinterpret_cast<volatile T*>(addr);
237 T old_val = RawAccess<>::load(p);
238 if (old_val == compare_value) {
239 RawAccess<>::store(p, new_value);
240 }
241 return old_val;
242 }
243 }
244
245 class RawAccessBarrierArrayCopy: public AllStatic {
246 public:
247 template <DecoratorSet decorators, typename T>
248 static inline typename EnableIf<
249 HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value>::type
250 arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
251 // We do not check for ARRAYCOPY_ATOMIC for oops, because they are unconditionally always atomic.
252 if (HasDecorator<decorators, ARRAYCOPY_ARRAYOF>::value) {
253 AccessInternal::arraycopy_arrayof_conjoint_oops(src, dst, length);
254 } else {
255 typedef typename HeapOopType<decorators>::type OopType;
256 AccessInternal::arraycopy_conjoint_oops(reinterpret_cast<OopType*>(src),
257 reinterpret_cast<OopType*>(dst), length);
258 }
259 }
260
261 template <DecoratorSet decorators, typename T>
262 static inline typename EnableIf<
263 !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value>::type
264 arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
265 if (HasDecorator<decorators, ARRAYCOPY_ARRAYOF>::value) {
266 AccessInternal::arraycopy_arrayof_conjoint(src, dst, length);
267 } else if (HasDecorator<decorators, ARRAYCOPY_DISJOINT>::value && sizeof(T) == HeapWordSize) {
268 // There is only a disjoint optimization for word granularity copying
269 if (HasDecorator<decorators, ARRAYCOPY_ATOMIC>::value) {
270 AccessInternal::arraycopy_disjoint_words_atomic(src, dst, length);
271 } else {
272 AccessInternal::arraycopy_disjoint_words(src, dst, length);
273 }
274 } else {
275 if (HasDecorator<decorators, ARRAYCOPY_ATOMIC>::value) {
276 AccessInternal::arraycopy_conjoint_atomic(src, dst, length);
277 } else {
278 AccessInternal::arraycopy_conjoint(src, dst, length);
279 }
280 }
281 }
282
283 template <DecoratorSet decorators>
284 static inline typename EnableIf<
285 !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value>::type
286 arraycopy(arrayOop src_obj, arrayOop dst_obj, void* src, void* dst, size_t length) {
287 if (HasDecorator<decorators, ARRAYCOPY_ATOMIC>::value) {
288 AccessInternal::arraycopy_conjoint_atomic(src, dst, length);
289 } else {
290 AccessInternal::arraycopy_conjoint(src, dst, length);
291 }
292 }
293 };
294
295 template <DecoratorSet decorators>
296 template <typename T>
297 inline bool RawAccessBarrier<decorators>::arraycopy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
298 RawAccessBarrierArrayCopy::arraycopy<decorators>(src_obj, dst_obj, src, dst, length);
299 return true;
300 }
301
302 template <DecoratorSet decorators>
303 inline void RawAccessBarrier<decorators>::clone(oop src, oop dst, size_t size) {
304 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
305 // is modifying a reference field in the clonee, a non-oop-atomic copy might
306 // be suspended in the middle of copying the pointer and end up with parts
307 // of two different pointers in the field. Subsequent dereferences will crash.
308 // 4846409: an oop-copy of objects with long or double fields or arrays of same
309 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
310 // of oops. We know objects are aligned on a minimum of an jlong boundary.
311 // The same is true of StubRoutines::object_copy and the various oop_copy
312 // variants, and of the code generated by the inline_native_clone intrinsic.
313
314 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
315 AccessInternal::arraycopy_conjoint_atomic(reinterpret_cast<jlong*>((oopDesc*)src),
316 reinterpret_cast<jlong*>((oopDesc*)dst),
317 align_object_size(size) / HeapWordsPerLong);
318 // Clear the header
319 dst->init_mark_raw();
320 }
321
322 #endif // SHARE_VM_RUNTIME_ACCESSBACKEND_INLINE_HPP