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_ACCESS_INLINE_HPP
26 #define SHARE_VM_RUNTIME_ACCESS_INLINE_HPP
27
28 #include "gc/shared/barrierSetConfig.inline.hpp"
29 #include "metaprogramming/conditional.hpp"
30 #include "metaprogramming/isFloatingPoint.hpp"
31 #include "metaprogramming/isIntegral.hpp"
32 #include "metaprogramming/isPointer.hpp"
33 #include "metaprogramming/isVolatile.hpp"
34 #include "oops/access.hpp"
35 #include "oops/accessBackend.inline.hpp"
36 #include "runtime/atomic.hpp"
37 #include "runtime/orderAccess.inline.hpp"
38
39 // This file outlines the template pipeline of accesses going through the Access
40 // API. There are essentially 5 steps for each access.
41 // * Step 1: Set default decorators and decay types. This step gets rid of CV qualifiers
42 // and sets default decorators to sensible values.
43 // * Step 2: Reduce types. This step makes sure there is only a single T type and not
44 // multiple types. The P type of the address and T type of the value must
45 // match.
46 // * Step 3: Pre-runtime dispatch. This step checks whether a runtime call can be
47 // avoided, and in that case avoids it (calling raw accesses or
48 // primitive accesses in a build that does not require primitive GC barriers)
49 // * Step 4: Runtime-dispatch. This step performs a runtime dispatch to the corresponding
50 // BarrierSet::AccessBarrier accessor that attaches GC-required barriers
51 // to the access.
52 // * Step 5: Post-runtime dispatch. This step now casts previously unknown types such
53 // as the address type of an oop on the heap (is it oop* or narrowOop*) to
54 // the appropriate type. It also splits sufficiently orthogonal accesses into
55 // different functions, such as whether the access involves oops or primitives
56 // and whether the access is performed on the heap or outside. Then the
57 // appropriate BarrierSet::AccessBarrier is called to perform the access.
58
59 namespace AccessInternal {
60
61 // Step 5: Post-runtime dispatch.
62 // This class is the last step before calling the BarrierSet::AccessBarrier.
63 // Here we make sure to figure out types that were not known prior to the
64 // runtime dispatch, such as whether an oop on the heap is oop or narrowOop.
65 // We also split orthogonal barriers such as handling primitives vs oops
66 // and on-heap vs off-heap into different calls to the barrier set.
67 template <class GCBarrierType, BarrierType type, DecoratorSet decorators>
68 struct PostRuntimeDispatch: public AllStatic { };
69
70 template <class GCBarrierType, DecoratorSet decorators>
71 struct PostRuntimeDispatch<GCBarrierType, BARRIER_STORE, decorators>: public AllStatic {
72 template <typename T>
73 static void access_barrier(void* addr, T value) {
74 GCBarrierType::store_in_heap(reinterpret_cast<T*>(addr), value);
75 }
76
77 static void oop_access_barrier(void* addr, oop value) {
78 typedef typename HeapOopType<decorators>::type OopType;
79 if (HasDecorator<decorators, IN_HEAP>::value) {
80 GCBarrierType::oop_store_in_heap(reinterpret_cast<OopType*>(addr), value);
81 } else {
82 GCBarrierType::oop_store_not_in_heap(reinterpret_cast<OopType*>(addr), value);
83 }
84 }
85 };
86
87 template <class GCBarrierType, DecoratorSet decorators>
88 struct PostRuntimeDispatch<GCBarrierType, BARRIER_LOAD, decorators>: public AllStatic {
89 template <typename T>
90 static T access_barrier(void* addr) {
91 return GCBarrierType::load_in_heap(reinterpret_cast<T*>(addr));
92 }
93
94 static oop oop_access_barrier(void* addr) {
95 typedef typename HeapOopType<decorators>::type OopType;
96 if (HasDecorator<decorators, IN_HEAP>::value) {
97 return GCBarrierType::oop_load_in_heap(reinterpret_cast<OopType*>(addr));
98 } else {
99 return GCBarrierType::oop_load_not_in_heap(reinterpret_cast<OopType*>(addr));
100 }
101 }
102 };
103
104 template <class GCBarrierType, DecoratorSet decorators>
105 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_XCHG, decorators>: public AllStatic {
106 template <typename T>
107 static T access_barrier(T new_value, void* addr) {
108 return GCBarrierType::atomic_xchg_in_heap(new_value, reinterpret_cast<T*>(addr));
109 }
110
111 static oop oop_access_barrier(oop new_value, void* addr) {
112 typedef typename HeapOopType<decorators>::type OopType;
113 if (HasDecorator<decorators, IN_HEAP>::value) {
114 return GCBarrierType::oop_atomic_xchg_in_heap(new_value, reinterpret_cast<OopType*>(addr));
115 } else {
116 return GCBarrierType::oop_atomic_xchg_not_in_heap(new_value, reinterpret_cast<OopType*>(addr));
117 }
118 }
119 };
120
121 template <class GCBarrierType, DecoratorSet decorators>
122 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_CMPXCHG, decorators>: public AllStatic {
123 template <typename T>
124 static T access_barrier(T new_value, void* addr, T compare_value) {
125 return GCBarrierType::atomic_cmpxchg_in_heap(new_value, reinterpret_cast<T*>(addr), compare_value);
126 }
127
128 static oop oop_access_barrier(oop new_value, void* addr, oop compare_value) {
129 typedef typename HeapOopType<decorators>::type OopType;
130 if (HasDecorator<decorators, IN_HEAP>::value) {
131 return GCBarrierType::oop_atomic_cmpxchg_in_heap(new_value, reinterpret_cast<OopType*>(addr), compare_value);
132 } else {
133 return GCBarrierType::oop_atomic_cmpxchg_not_in_heap(new_value, reinterpret_cast<OopType*>(addr), compare_value);
134 }
135 }
136 };
137
138 template <class GCBarrierType, DecoratorSet decorators>
139 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ARRAYCOPY, decorators>: public AllStatic {
140 template <typename T>
141 static bool access_barrier(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
142 GCBarrierType::arraycopy_in_heap(src_obj, dst_obj, src, dst, length);
143 return true;
144 }
145
146 template <typename T>
147 static bool oop_access_barrier(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
148 typedef typename HeapOopType<decorators>::type OopType;
149 return GCBarrierType::oop_arraycopy_in_heap(src_obj, dst_obj,
150 reinterpret_cast<OopType*>(src),
151 reinterpret_cast<OopType*>(dst), length);
152 }
153 };
154
155 template <class GCBarrierType, DecoratorSet decorators>
156 struct PostRuntimeDispatch<GCBarrierType, BARRIER_STORE_AT, decorators>: public AllStatic {
157 template <typename T>
158 static void access_barrier(oop base, ptrdiff_t offset, T value) {
159 GCBarrierType::store_in_heap_at(base, offset, value);
160 }
161
162 static void oop_access_barrier(oop base, ptrdiff_t offset, oop value) {
163 GCBarrierType::oop_store_in_heap_at(base, offset, value);
164 }
165 };
166
167 template <class GCBarrierType, DecoratorSet decorators>
168 struct PostRuntimeDispatch<GCBarrierType, BARRIER_LOAD_AT, decorators>: public AllStatic {
169 template <typename T>
170 static T access_barrier(oop base, ptrdiff_t offset) {
171 return GCBarrierType::template load_in_heap_at<T>(base, offset);
172 }
173
174 static oop oop_access_barrier(oop base, ptrdiff_t offset) {
175 return GCBarrierType::oop_load_in_heap_at(base, offset);
176 }
177 };
178
179 template <class GCBarrierType, DecoratorSet decorators>
180 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_XCHG_AT, decorators>: public AllStatic {
181 template <typename T>
182 static T access_barrier(T new_value, oop base, ptrdiff_t offset) {
183 return GCBarrierType::atomic_xchg_in_heap_at(new_value, base, offset);
184 }
185
186 static oop oop_access_barrier(oop new_value, oop base, ptrdiff_t offset) {
187 return GCBarrierType::oop_atomic_xchg_in_heap_at(new_value, base, offset);
188 }
189 };
190
191 template <class GCBarrierType, DecoratorSet decorators>
192 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_CMPXCHG_AT, decorators>: public AllStatic {
193 template <typename T>
194 static T access_barrier(T new_value, oop base, ptrdiff_t offset, T compare_value) {
195 return GCBarrierType::atomic_cmpxchg_in_heap_at(new_value, base, offset, compare_value);
196 }
197
198 static oop oop_access_barrier(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
199 return GCBarrierType::oop_atomic_cmpxchg_in_heap_at(new_value, base, offset, compare_value);
200 }
201 };
202
203 template <class GCBarrierType, DecoratorSet decorators>
204 struct PostRuntimeDispatch<GCBarrierType, BARRIER_CLONE, decorators>: public AllStatic {
205 static void access_barrier(oop src, oop dst, size_t size) {
206 GCBarrierType::clone_in_heap(src, dst, size);
207 }
208 };
209
210 template <class GCBarrierType, DecoratorSet decorators>
211 struct PostRuntimeDispatch<GCBarrierType, BARRIER_RESOLVE, decorators>: public AllStatic {
212 static oop access_barrier(oop obj) {
213 return GCBarrierType::resolve(obj);
214 }
215 };
216
217 // Resolving accessors with barriers from the barrier set happens in two steps.
218 // 1. Expand paths with runtime-decorators, e.g. is UseCompressedOops on or off.
219 // 2. Expand paths for each BarrierSet available in the system.
220 template <DecoratorSet decorators, typename FunctionPointerT, BarrierType barrier_type>
221 struct BarrierResolver: public AllStatic {
222 template <DecoratorSet ds>
223 static typename EnableIf<
224 HasDecorator<ds, INTERNAL_VALUE_IS_OOP>::value,
225 FunctionPointerT>::type
226 resolve_barrier_gc() {
227 BarrierSet* bs = BarrierSet::barrier_set();
228 assert(bs != NULL, "GC barriers invoked before BarrierSet is set");
229 switch (bs->kind()) {
230 #define BARRIER_SET_RESOLVE_BARRIER_CLOSURE(bs_name) \
231 case BarrierSet::bs_name: { \
232 return PostRuntimeDispatch<typename BarrierSet::GetType<BarrierSet::bs_name>::type:: \
233 AccessBarrier<ds>, barrier_type, ds>::oop_access_barrier; \
234 } \
235 break;
236 FOR_EACH_CONCRETE_BARRIER_SET_DO(BARRIER_SET_RESOLVE_BARRIER_CLOSURE)
237 #undef BARRIER_SET_RESOLVE_BARRIER_CLOSURE
238
239 default:
240 fatal("BarrierSet AccessBarrier resolving not implemented");
241 return NULL;
242 };
243 }
244
245 template <DecoratorSet ds>
246 static typename EnableIf<
247 !HasDecorator<ds, INTERNAL_VALUE_IS_OOP>::value,
248 FunctionPointerT>::type
249 resolve_barrier_gc() {
250 BarrierSet* bs = BarrierSet::barrier_set();
251 assert(bs != NULL, "GC barriers invoked before BarrierSet is set");
252 switch (bs->kind()) {
253 #define BARRIER_SET_RESOLVE_BARRIER_CLOSURE(bs_name) \
254 case BarrierSet::bs_name: { \
255 return PostRuntimeDispatch<typename BarrierSet::GetType<BarrierSet::bs_name>::type:: \
256 AccessBarrier<ds>, barrier_type, ds>::access_barrier; \
257 } \
258 break;
259 FOR_EACH_CONCRETE_BARRIER_SET_DO(BARRIER_SET_RESOLVE_BARRIER_CLOSURE)
260 #undef BARRIER_SET_RESOLVE_BARRIER_CLOSURE
261
262 default:
263 fatal("BarrierSet AccessBarrier resolving not implemented");
264 return NULL;
265 };
266 }
267
268 static FunctionPointerT resolve_barrier_rt() {
269 if (UseCompressedOops) {
270 const DecoratorSet expanded_decorators = decorators | INTERNAL_RT_USE_COMPRESSED_OOPS;
271 return resolve_barrier_gc<expanded_decorators>();
272 } else {
273 return resolve_barrier_gc<decorators>();
274 }
275 }
276
277 static FunctionPointerT resolve_barrier() {
278 return resolve_barrier_rt();
279 }
280 };
281
282 // Step 4: Runtime dispatch
283 // The RuntimeDispatch class is responsible for performing a runtime dispatch of the
284 // accessor. This is required when the access either depends on whether compressed oops
285 // is being used, or it depends on which GC implementation was chosen (e.g. requires GC
286 // barriers). The way it works is that a function pointer initially pointing to an
287 // accessor resolution function gets called for each access. Upon first invocation,
288 // it resolves which accessor to be used in future invocations and patches the
289 // function pointer to this new accessor.
290
291 template <DecoratorSet decorators, typename T, BarrierType type>
292 struct RuntimeDispatch: AllStatic {};
293
294 template <DecoratorSet decorators, typename T>
295 struct RuntimeDispatch<decorators, T, BARRIER_STORE>: AllStatic {
296 typedef typename AccessFunction<decorators, T, BARRIER_STORE>::type func_t;
297 static func_t _store_func;
298
299 static void store_init(void* addr, T value) {
300 func_t function = BarrierResolver<decorators, func_t, BARRIER_STORE>::resolve_barrier();
301 _store_func = function;
302 function(addr, value);
303 }
304
305 static inline void store(void* addr, T value) {
306 _store_func(addr, value);
307 }
308 };
309
310 template <DecoratorSet decorators, typename T>
311 struct RuntimeDispatch<decorators, T, BARRIER_STORE_AT>: AllStatic {
312 typedef typename AccessFunction<decorators, T, BARRIER_STORE_AT>::type func_t;
313 static func_t _store_at_func;
314
315 static void store_at_init(oop base, ptrdiff_t offset, T value) {
316 func_t function = BarrierResolver<decorators, func_t, BARRIER_STORE_AT>::resolve_barrier();
317 _store_at_func = function;
318 function(base, offset, value);
319 }
320
321 static inline void store_at(oop base, ptrdiff_t offset, T value) {
322 _store_at_func(base, offset, value);
323 }
324 };
325
326 template <DecoratorSet decorators, typename T>
327 struct RuntimeDispatch<decorators, T, BARRIER_LOAD>: AllStatic {
328 typedef typename AccessFunction<decorators, T, BARRIER_LOAD>::type func_t;
329 static func_t _load_func;
330
331 static T load_init(void* addr) {
332 func_t function = BarrierResolver<decorators, func_t, BARRIER_LOAD>::resolve_barrier();
333 _load_func = function;
334 return function(addr);
335 }
336
337 static inline T load(void* addr) {
338 return _load_func(addr);
339 }
340 };
341
342 template <DecoratorSet decorators, typename T>
343 struct RuntimeDispatch<decorators, T, BARRIER_LOAD_AT>: AllStatic {
344 typedef typename AccessFunction<decorators, T, BARRIER_LOAD_AT>::type func_t;
345 static func_t _load_at_func;
346
347 static T load_at_init(oop base, ptrdiff_t offset) {
348 func_t function = BarrierResolver<decorators, func_t, BARRIER_LOAD_AT>::resolve_barrier();
349 _load_at_func = function;
350 return function(base, offset);
351 }
352
353 static inline T load_at(oop base, ptrdiff_t offset) {
354 return _load_at_func(base, offset);
355 }
356 };
357
358 template <DecoratorSet decorators, typename T>
359 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG>: AllStatic {
360 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG>::type func_t;
361 static func_t _atomic_cmpxchg_func;
362
363 static T atomic_cmpxchg_init(T new_value, void* addr, T compare_value) {
364 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_CMPXCHG>::resolve_barrier();
365 _atomic_cmpxchg_func = function;
366 return function(new_value, addr, compare_value);
367 }
368
369 static inline T atomic_cmpxchg(T new_value, void* addr, T compare_value) {
370 return _atomic_cmpxchg_func(new_value, addr, compare_value);
371 }
372 };
373
374 template <DecoratorSet decorators, typename T>
375 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>: AllStatic {
376 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::type func_t;
377 static func_t _atomic_cmpxchg_at_func;
378
379 static T atomic_cmpxchg_at_init(T new_value, oop base, ptrdiff_t offset, T compare_value) {
380 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_CMPXCHG_AT>::resolve_barrier();
381 _atomic_cmpxchg_at_func = function;
382 return function(new_value, base, offset, compare_value);
383 }
384
385 static inline T atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
386 return _atomic_cmpxchg_at_func(new_value, base, offset, compare_value);
387 }
388 };
389
390 template <DecoratorSet decorators, typename T>
391 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG>: AllStatic {
392 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG>::type func_t;
393 static func_t _atomic_xchg_func;
394
395 static T atomic_xchg_init(T new_value, void* addr) {
396 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_XCHG>::resolve_barrier();
397 _atomic_xchg_func = function;
398 return function(new_value, addr);
399 }
400
401 static inline T atomic_xchg(T new_value, void* addr) {
402 return _atomic_xchg_func(new_value, addr);
403 }
404 };
405
406 template <DecoratorSet decorators, typename T>
407 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG_AT>: AllStatic {
408 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG_AT>::type func_t;
409 static func_t _atomic_xchg_at_func;
410
411 static T atomic_xchg_at_init(T new_value, oop base, ptrdiff_t offset) {
412 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_XCHG_AT>::resolve_barrier();
413 _atomic_xchg_at_func = function;
414 return function(new_value, base, offset);
415 }
416
417 static inline T atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
418 return _atomic_xchg_at_func(new_value, base, offset);
419 }
420 };
421
422 template <DecoratorSet decorators, typename T>
423 struct RuntimeDispatch<decorators, T, BARRIER_ARRAYCOPY>: AllStatic {
424 typedef typename AccessFunction<decorators, T, BARRIER_ARRAYCOPY>::type func_t;
425 static func_t _arraycopy_func;
426
427 static bool arraycopy_init(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
428 func_t function = BarrierResolver<decorators, func_t, BARRIER_ARRAYCOPY>::resolve_barrier();
429 _arraycopy_func = function;
430 return function(src_obj, dst_obj, src, dst, length);
431 }
432
433 static inline bool arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
434 return _arraycopy_func(src_obj, dst_obj, src, dst, length);
435 }
436 };
437
438 template <DecoratorSet decorators, typename T>
439 struct RuntimeDispatch<decorators, T, BARRIER_CLONE>: AllStatic {
440 typedef typename AccessFunction<decorators, T, BARRIER_CLONE>::type func_t;
441 static func_t _clone_func;
442
443 static void clone_init(oop src, oop dst, size_t size) {
444 func_t function = BarrierResolver<decorators, func_t, BARRIER_CLONE>::resolve_barrier();
445 _clone_func = function;
446 function(src, dst, size);
447 }
448
449 static inline void clone(oop src, oop dst, size_t size) {
450 _clone_func(src, dst, size);
451 }
452 };
453
454 template <DecoratorSet decorators, typename T>
455 struct RuntimeDispatch<decorators, T, BARRIER_RESOLVE>: AllStatic {
456 typedef typename AccessFunction<decorators, T, BARRIER_RESOLVE>::type func_t;
457 static func_t _resolve_func;
458
459 static oop resolve_init(oop obj) {
460 func_t function = BarrierResolver<decorators, func_t, BARRIER_RESOLVE>::resolve_barrier();
461 _resolve_func = function;
462 return function(obj);
463 }
464
465 static inline oop resolve(oop obj) {
466 return _resolve_func(obj);
467 }
468 };
469
470 // Initialize the function pointers to point to the resolving function.
471 template <DecoratorSet decorators, typename T>
472 typename AccessFunction<decorators, T, BARRIER_STORE>::type
473 RuntimeDispatch<decorators, T, BARRIER_STORE>::_store_func = &store_init;
474
475 template <DecoratorSet decorators, typename T>
476 typename AccessFunction<decorators, T, BARRIER_STORE_AT>::type
477 RuntimeDispatch<decorators, T, BARRIER_STORE_AT>::_store_at_func = &store_at_init;
478
479 template <DecoratorSet decorators, typename T>
480 typename AccessFunction<decorators, T, BARRIER_LOAD>::type
481 RuntimeDispatch<decorators, T, BARRIER_LOAD>::_load_func = &load_init;
482
483 template <DecoratorSet decorators, typename T>
484 typename AccessFunction<decorators, T, BARRIER_LOAD_AT>::type
485 RuntimeDispatch<decorators, T, BARRIER_LOAD_AT>::_load_at_func = &load_at_init;
486
487 template <DecoratorSet decorators, typename T>
488 typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG>::type
489 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG>::_atomic_cmpxchg_func = &atomic_cmpxchg_init;
490
491 template <DecoratorSet decorators, typename T>
492 typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::type
493 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::_atomic_cmpxchg_at_func = &atomic_cmpxchg_at_init;
494
495 template <DecoratorSet decorators, typename T>
496 typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG>::type
497 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG>::_atomic_xchg_func = &atomic_xchg_init;
498
499 template <DecoratorSet decorators, typename T>
500 typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG_AT>::type
501 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG_AT>::_atomic_xchg_at_func = &atomic_xchg_at_init;
502
503 template <DecoratorSet decorators, typename T>
504 typename AccessFunction<decorators, T, BARRIER_ARRAYCOPY>::type
505 RuntimeDispatch<decorators, T, BARRIER_ARRAYCOPY>::_arraycopy_func = &arraycopy_init;
506
507 template <DecoratorSet decorators, typename T>
508 typename AccessFunction<decorators, T, BARRIER_CLONE>::type
509 RuntimeDispatch<decorators, T, BARRIER_CLONE>::_clone_func = &clone_init;
510
511 template <DecoratorSet decorators, typename T>
512 typename AccessFunction<decorators, T, BARRIER_RESOLVE>::type
513 RuntimeDispatch<decorators, T, BARRIER_RESOLVE>::_resolve_func = &resolve_init;
514
515 // Step 3: Pre-runtime dispatching.
516 // The PreRuntimeDispatch class is responsible for filtering the barrier strength
517 // decorators. That is, for AS_RAW, it hardwires the accesses without a runtime
518 // dispatch point. Otherwise it goes through a runtime check if hardwiring was
519 // not possible.
520 struct PreRuntimeDispatch: AllStatic {
521 template<DecoratorSet decorators>
522 struct CanHardwireRaw: public IntegralConstant<
523 bool,
524 !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value || // primitive access
525 !HasDecorator<decorators, INTERNAL_CONVERT_COMPRESSED_OOP>::value || // don't care about compressed oops (oop* address)
526 HasDecorator<decorators, INTERNAL_RT_USE_COMPRESSED_OOPS>::value> // we can infer we use compressed oops (narrowOop* address)
527 {};
528
529 static const DecoratorSet convert_compressed_oops = INTERNAL_RT_USE_COMPRESSED_OOPS | INTERNAL_CONVERT_COMPRESSED_OOP;
530
531 template<DecoratorSet decorators>
532 static bool is_hardwired_primitive() {
533 return !HasDecorator<decorators, INTERNAL_BT_BARRIER_ON_PRIMITIVES>::value &&
534 !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value;
535 }
536
537 template <DecoratorSet decorators, typename T>
538 inline static typename EnableIf<
539 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value>::type
540 store(void* addr, T value) {
541 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
542 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
543 Raw::oop_store(addr, value);
544 } else {
545 Raw::store(addr, value);
546 }
547 }
548
549 template <DecoratorSet decorators, typename T>
550 inline static typename EnableIf<
551 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value>::type
552 store(void* addr, T value) {
553 if (UseCompressedOops) {
554 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
555 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
556 } else {
557 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
558 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
559 }
560 }
561
562 template <DecoratorSet decorators, typename T>
563 inline static typename EnableIf<
564 !HasDecorator<decorators, AS_RAW>::value>::type
565 store(void* addr, T value) {
566 if (is_hardwired_primitive<decorators>()) {
567 const DecoratorSet expanded_decorators = decorators | AS_RAW;
568 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
569 } else {
570 RuntimeDispatch<decorators, T, BARRIER_STORE>::store(addr, value);
571 }
572 }
573
574 template <DecoratorSet decorators, typename T>
575 inline static typename EnableIf<
576 HasDecorator<decorators, AS_RAW>::value>::type
577 store_at(oop base, ptrdiff_t offset, T value) {
578 store<decorators>(field_addr(base, offset), value);
579 }
580
581 template <DecoratorSet decorators, typename T>
582 inline static typename EnableIf<
583 !HasDecorator<decorators, AS_RAW>::value>::type
584 store_at(oop base, ptrdiff_t offset, T value) {
585 if (is_hardwired_primitive<decorators>()) {
586 const DecoratorSet expanded_decorators = decorators | AS_RAW;
587 PreRuntimeDispatch::store_at<expanded_decorators>(base, offset, value);
588 } else {
589 RuntimeDispatch<decorators, T, BARRIER_STORE_AT>::store_at(base, offset, value);
590 }
591 }
592
593 template <DecoratorSet decorators, typename T>
594 inline static typename EnableIf<
595 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
596 load(void* addr) {
597 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
598 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
599 return Raw::template oop_load<T>(addr);
600 } else {
601 return Raw::template load<T>(addr);
602 }
603 }
604
605 template <DecoratorSet decorators, typename T>
606 inline static typename EnableIf<
607 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
608 load(void* addr) {
609 if (UseCompressedOops) {
610 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
611 return PreRuntimeDispatch::load<expanded_decorators, T>(addr);
612 } else {
613 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
614 return PreRuntimeDispatch::load<expanded_decorators, T>(addr);
615 }
616 }
617
618 template <DecoratorSet decorators, typename T>
619 inline static typename EnableIf<
620 !HasDecorator<decorators, AS_RAW>::value, T>::type
621 load(void* addr) {
622 if (is_hardwired_primitive<decorators>()) {
623 const DecoratorSet expanded_decorators = decorators | AS_RAW;
624 return PreRuntimeDispatch::load<expanded_decorators, T>(addr);
625 } else {
626 return RuntimeDispatch<decorators, T, BARRIER_LOAD>::load(addr);
627 }
628 }
629
630 template <DecoratorSet decorators, typename T>
631 inline static typename EnableIf<
632 HasDecorator<decorators, AS_RAW>::value, T>::type
633 load_at(oop base, ptrdiff_t offset) {
634 return load<decorators, T>(field_addr(base, offset));
635 }
636
637 template <DecoratorSet decorators, typename T>
638 inline static typename EnableIf<
639 !HasDecorator<decorators, AS_RAW>::value, T>::type
640 load_at(oop base, ptrdiff_t offset) {
641 if (is_hardwired_primitive<decorators>()) {
642 const DecoratorSet expanded_decorators = decorators | AS_RAW;
643 return PreRuntimeDispatch::load_at<expanded_decorators, T>(base, offset);
644 } else {
645 return RuntimeDispatch<decorators, T, BARRIER_LOAD_AT>::load_at(base, offset);
646 }
647 }
648
649 template <DecoratorSet decorators, typename T>
650 inline static typename EnableIf<
651 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
652 atomic_cmpxchg(T new_value, void* addr, T compare_value) {
653 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
654 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
655 return Raw::oop_atomic_cmpxchg(new_value, addr, compare_value);
656 } else {
657 return Raw::atomic_cmpxchg(new_value, addr, compare_value);
658 }
659 }
660
661 template <DecoratorSet decorators, typename T>
662 inline static typename EnableIf<
663 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
664 atomic_cmpxchg(T new_value, void* addr, T compare_value) {
665 if (UseCompressedOops) {
666 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
667 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
668 } else {
669 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
670 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
671 }
672 }
673
674 template <DecoratorSet decorators, typename T>
675 inline static typename EnableIf<
676 !HasDecorator<decorators, AS_RAW>::value, T>::type
677 atomic_cmpxchg(T new_value, void* addr, T compare_value) {
678 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
679 if (is_hardwired_primitive<decorators>()) {
680 const DecoratorSet expanded_decorators = decorators | AS_RAW;
681 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
682 } else {
683 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG>::atomic_cmpxchg(new_value, addr, compare_value);
684 }
685 }
686
687 template <DecoratorSet decorators, typename T>
688 inline static typename EnableIf<
689 HasDecorator<decorators, AS_RAW>::value, T>::type
690 atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
691 return atomic_cmpxchg<decorators>(new_value, field_addr(base, offset), compare_value);
692 }
693
694 template <DecoratorSet decorators, typename T>
695 inline static typename EnableIf<
696 !HasDecorator<decorators, AS_RAW>::value, T>::type
697 atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
698 if (is_hardwired_primitive<decorators>()) {
699 const DecoratorSet expanded_decorators = decorators | AS_RAW;
700 return PreRuntimeDispatch::atomic_cmpxchg_at<expanded_decorators>(new_value, base, offset, compare_value);
701 } else {
702 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::atomic_cmpxchg_at(new_value, base, offset, compare_value);
703 }
704 }
705
706 template <DecoratorSet decorators, typename T>
707 inline static typename EnableIf<
708 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
709 atomic_xchg(T new_value, void* addr) {
710 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
711 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
712 return Raw::oop_atomic_xchg(new_value, addr);
713 } else {
714 return Raw::atomic_xchg(new_value, addr);
715 }
716 }
717
718 template <DecoratorSet decorators, typename T>
719 inline static typename EnableIf<
720 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
721 atomic_xchg(T new_value, void* addr) {
722 if (UseCompressedOops) {
723 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
724 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
725 } else {
726 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
727 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
728 }
729 }
730
731 template <DecoratorSet decorators, typename T>
732 inline static typename EnableIf<
733 !HasDecorator<decorators, AS_RAW>::value, T>::type
734 atomic_xchg(T new_value, void* addr) {
735 if (is_hardwired_primitive<decorators>()) {
736 const DecoratorSet expanded_decorators = decorators | AS_RAW;
737 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
738 } else {
739 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG>::atomic_xchg(new_value, addr);
740 }
741 }
742
743 template <DecoratorSet decorators, typename T>
744 inline static typename EnableIf<
745 HasDecorator<decorators, AS_RAW>::value, T>::type
746 atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
747 return atomic_xchg<decorators>(new_value, field_addr(base, offset));
748 }
749
750 template <DecoratorSet decorators, typename T>
751 inline static typename EnableIf<
752 !HasDecorator<decorators, AS_RAW>::value, T>::type
753 atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
754 if (is_hardwired_primitive<decorators>()) {
755 const DecoratorSet expanded_decorators = decorators | AS_RAW;
756 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, base, offset);
757 } else {
758 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG_AT>::atomic_xchg_at(new_value, base, offset);
759 }
760 }
761
762 template <DecoratorSet decorators, typename T>
763 inline static typename EnableIf<
764 HasDecorator<decorators, AS_RAW>::value, bool>::type
765 arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
766 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
767 return Raw::arraycopy(src_obj, dst_obj, src, dst, length);
768 }
769
770 template <DecoratorSet decorators, typename T>
771 inline static typename EnableIf<
772 !HasDecorator<decorators, AS_RAW>::value, bool>::type
773 arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
774 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
775 if (is_hardwired_primitive<decorators>()) {
776 const DecoratorSet expanded_decorators = decorators | AS_RAW;
777 return PreRuntimeDispatch::arraycopy<expanded_decorators>(src_obj, dst_obj, src, dst, length);
778 } else {
779 return RuntimeDispatch<decorators, T, BARRIER_ARRAYCOPY>::arraycopy(src_obj, dst_obj, src, dst, length);
780 }
781 }
782
783 template <DecoratorSet decorators>
784 inline static typename EnableIf<
785 HasDecorator<decorators, AS_RAW>::value>::type
786 clone(oop src, oop dst, size_t size) {
787 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
788 Raw::clone(src, dst, size);
789 }
790
791 template <DecoratorSet decorators>
792 inline static typename EnableIf<
793 !HasDecorator<decorators, AS_RAW>::value>::type
794 clone(oop src, oop dst, size_t size) {
795 RuntimeDispatch<decorators, oop, BARRIER_CLONE>::clone(src, dst, size);
796 }
797
798 template <DecoratorSet decorators>
799 inline static typename EnableIf<
800 HasDecorator<decorators, INTERNAL_BT_TO_SPACE_INVARIANT>::value, oop>::type
801 resolve(oop obj) {
802 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
803 return Raw::resolve(obj);
804 }
805
806 template <DecoratorSet decorators>
807 inline static typename EnableIf<
808 !HasDecorator<decorators, INTERNAL_BT_TO_SPACE_INVARIANT>::value, oop>::type
809 resolve(oop obj) {
810 return RuntimeDispatch<decorators, oop, BARRIER_RESOLVE>::resolve(obj);
811 }
812 };
813
814 // This class adds implied decorators that follow according to decorator rules.
815 // For example adding default reference strength and default memory ordering
816 // semantics.
817 template <DecoratorSet input_decorators>
818 struct DecoratorFixup: AllStatic {
819 // If no reference strength has been picked, then strong will be picked
820 static const DecoratorSet ref_strength_default = input_decorators |
821 (((ON_DECORATOR_MASK & input_decorators) == 0 && (INTERNAL_VALUE_IS_OOP & input_decorators) != 0) ?
822 ON_STRONG_OOP_REF : INTERNAL_EMPTY);
823 // If no memory ordering has been picked, unordered will be picked
824 static const DecoratorSet memory_ordering_default = ref_strength_default |
825 ((MO_DECORATOR_MASK & ref_strength_default) == 0 ? MO_UNORDERED : INTERNAL_EMPTY);
826 // If no barrier strength has been picked, normal will be used
827 static const DecoratorSet barrier_strength_default = memory_ordering_default |
828 ((AS_DECORATOR_MASK & memory_ordering_default) == 0 ? AS_NORMAL : INTERNAL_EMPTY);
829 // Heap array accesses imply it is a heap access
830 static const DecoratorSet heap_array_is_in_heap = barrier_strength_default |
831 ((IN_HEAP_ARRAY & barrier_strength_default) != 0 ? IN_HEAP : INTERNAL_EMPTY);
832 static const DecoratorSet conc_root_is_root = heap_array_is_in_heap |
833 ((IN_CONCURRENT_ROOT & heap_array_is_in_heap) != 0 ? IN_ROOT : INTERNAL_EMPTY);
834 static const DecoratorSet archive_root_is_root = conc_root_is_root |
835 ((IN_ARCHIVE_ROOT & conc_root_is_root) != 0 ? IN_ROOT : INTERNAL_EMPTY);
836 static const DecoratorSet value = archive_root_is_root | BT_BUILDTIME_DECORATORS;
837 };
838
839 // Step 2: Reduce types.
840 // Enforce that for non-oop types, T and P have to be strictly the same.
841 // P is the type of the address and T is the type of the values.
842 // As for oop types, it is allow to send T in {narrowOop, oop} and
843 // P in {narrowOop, oop, HeapWord*}. The following rules apply according to
844 // the subsequent table. (columns are P, rows are T)
845 // | | HeapWord | oop | narrowOop |
846 // | oop | rt-comp | hw-none | hw-comp |
847 // | narrowOop | x | x | hw-none |
848 //
849 // x means not allowed
850 // rt-comp means it must be checked at runtime whether the oop is compressed.
851 // hw-none means it is statically known the oop will not be compressed.
852 // hw-comp means it is statically known the oop will be compressed.
853
854 template <DecoratorSet decorators, typename T>
855 inline void store_reduce_types(T* addr, T value) {
856 PreRuntimeDispatch::store<decorators>(addr, value);
857 }
858
859 template <DecoratorSet decorators>
860 inline void store_reduce_types(narrowOop* addr, oop value) {
861 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
862 INTERNAL_RT_USE_COMPRESSED_OOPS;
863 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
864 }
865
866 template <DecoratorSet decorators>
867 inline void store_reduce_types(narrowOop* addr, narrowOop value) {
868 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
869 INTERNAL_RT_USE_COMPRESSED_OOPS;
870 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
871 }
872
873 template <DecoratorSet decorators>
874 inline void store_reduce_types(HeapWord* addr, oop value) {
875 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
876 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
877 }
878
879 template <DecoratorSet decorators, typename T>
880 inline T atomic_cmpxchg_reduce_types(T new_value, T* addr, T compare_value) {
881 return PreRuntimeDispatch::atomic_cmpxchg<decorators>(new_value, addr, compare_value);
882 }
883
884 template <DecoratorSet decorators>
885 inline oop atomic_cmpxchg_reduce_types(oop new_value, narrowOop* addr, oop compare_value) {
886 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
887 INTERNAL_RT_USE_COMPRESSED_OOPS;
888 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
889 }
890
891 template <DecoratorSet decorators>
892 inline narrowOop atomic_cmpxchg_reduce_types(narrowOop new_value, narrowOop* addr, narrowOop compare_value) {
893 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
894 INTERNAL_RT_USE_COMPRESSED_OOPS;
895 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
896 }
897
898 template <DecoratorSet decorators>
899 inline oop atomic_cmpxchg_reduce_types(oop new_value,
900 HeapWord* addr,
901 oop compare_value) {
902 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
903 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
904 }
905
906 template <DecoratorSet decorators, typename T>
907 inline T atomic_xchg_reduce_types(T new_value, T* addr) {
908 const DecoratorSet expanded_decorators = decorators;
909 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
910 }
911
912 template <DecoratorSet decorators>
913 inline oop atomic_xchg_reduce_types(oop new_value, narrowOop* addr) {
914 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
915 INTERNAL_RT_USE_COMPRESSED_OOPS;
916 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
917 }
918
919 template <DecoratorSet decorators>
920 inline narrowOop atomic_xchg_reduce_types(narrowOop new_value, narrowOop* addr) {
921 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
922 INTERNAL_RT_USE_COMPRESSED_OOPS;
923 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
924 }
925
926 template <DecoratorSet decorators>
927 inline oop atomic_xchg_reduce_types(oop new_value, HeapWord* addr) {
928 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
929 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
930 }
931
932 template <DecoratorSet decorators, typename T>
933 inline T load_reduce_types(T* addr) {
934 return PreRuntimeDispatch::load<decorators, T>(addr);
935 }
936
937 template <DecoratorSet decorators, typename T>
938 inline typename OopOrNarrowOop<T>::type load_reduce_types(narrowOop* addr) {
939 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
940 INTERNAL_RT_USE_COMPRESSED_OOPS;
941 return PreRuntimeDispatch::load<expanded_decorators, typename OopOrNarrowOop<T>::type>(addr);
942 }
943
944 template <DecoratorSet decorators, typename T>
945 inline oop load_reduce_types(HeapWord* addr) {
946 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
947 return PreRuntimeDispatch::load<expanded_decorators, oop>(addr);
948 }
949
950 // Step 1: Set default decorators. This step remembers if a type was volatile
951 // and then sets the MO_VOLATILE decorator by default. Otherwise, a default
952 // memory ordering is set for the access, and the implied decorator rules
953 // are applied to select sensible defaults for decorators that have not been
954 // explicitly set. For example, default object referent strength is set to strong.
955 // This step also decays the types passed in (e.g. getting rid of CV qualifiers
956 // and references from the types). This step also perform some type verification
957 // that the passed in types make sense.
958
959 template <DecoratorSet decorators, typename T>
960 static void verify_types(){
961 // If this fails to compile, then you have sent in something that is
962 // not recognized as a valid primitive type to a primitive Access function.
963 STATIC_ASSERT((HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value || // oops have already been validated
964 (IsPointer<T>::value || IsIntegral<T>::value) ||
965 IsFloatingPoint<T>::value)); // not allowed primitive type
966 }
967
968 template <DecoratorSet decorators, typename P, typename T>
969 inline void store(P* addr, T value) {
970 verify_types<decorators, T>();
971 typedef typename Decay<P>::type DecayedP;
972 typedef typename Decay<T>::type DecayedT;
973 DecayedT decayed_value = value;
974 // If a volatile address is passed in but no memory ordering decorator,
975 // set the memory ordering to MO_VOLATILE by default.
976 const DecoratorSet expanded_decorators = DecoratorFixup<
977 (IsVolatile<P>::value && !HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
978 (MO_VOLATILE | decorators) : decorators>::value;
979 store_reduce_types<expanded_decorators>(const_cast<DecayedP*>(addr), decayed_value);
980 }
981
982 template <DecoratorSet decorators, typename T>
983 inline void store_at(oop base, ptrdiff_t offset, T value) {
984 verify_types<decorators, T>();
985 typedef typename Decay<T>::type DecayedT;
986 DecayedT decayed_value = value;
987 const DecoratorSet expanded_decorators = DecoratorFixup<decorators |
988 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
989 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
990 PreRuntimeDispatch::store_at<expanded_decorators>(base, offset, decayed_value);
991 }
992
993 template <DecoratorSet decorators, typename P, typename T>
994 inline T load(P* addr) {
995 verify_types<decorators, T>();
996 typedef typename Decay<P>::type DecayedP;
997 typedef typename Conditional<HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value,
998 typename OopOrNarrowOop<T>::type,
999 typename Decay<T>::type>::type DecayedT;
1000 // If a volatile address is passed in but no memory ordering decorator,
1001 // set the memory ordering to MO_VOLATILE by default.
1002 const DecoratorSet expanded_decorators = DecoratorFixup<
1003 (IsVolatile<P>::value && !HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
1004 (MO_VOLATILE | decorators) : decorators>::value;
1005 return load_reduce_types<expanded_decorators, DecayedT>(const_cast<DecayedP*>(addr));
1006 }
1007
1008 template <DecoratorSet decorators, typename T>
1009 inline T load_at(oop base, ptrdiff_t offset) {
1010 verify_types<decorators, T>();
1011 typedef typename Conditional<HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value,
1012 typename OopOrNarrowOop<T>::type,
1013 typename Decay<T>::type>::type DecayedT;
1014 // Expand the decorators (figure out sensible defaults)
1015 // Potentially remember if we need compressed oop awareness
1016 const DecoratorSet expanded_decorators = DecoratorFixup<decorators |
1017 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1018 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
1019 return PreRuntimeDispatch::load_at<expanded_decorators, DecayedT>(base, offset);
1020 }
1021
1022 template <DecoratorSet decorators, typename P, typename T>
1023 inline T atomic_cmpxchg(T new_value, P* addr, T compare_value) {
1024 verify_types<decorators, T>();
1025 typedef typename Decay<P>::type DecayedP;
1026 typedef typename Decay<T>::type DecayedT;
1027 DecayedT new_decayed_value = new_value;
1028 DecayedT compare_decayed_value = compare_value;
1029 const DecoratorSet expanded_decorators = DecoratorFixup<
1030 (!HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
1031 (MO_SEQ_CST | decorators) : decorators>::value;
1032 return atomic_cmpxchg_reduce_types<expanded_decorators>(new_decayed_value,
1033 const_cast<DecayedP*>(addr),
1034 compare_decayed_value);
1035 }
1036
1037 template <DecoratorSet decorators, typename T>
1038 inline T atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
1039 verify_types<decorators, T>();
1040 typedef typename Decay<T>::type DecayedT;
1041 DecayedT new_decayed_value = new_value;
1042 DecayedT compare_decayed_value = compare_value;
1043 // Determine default memory ordering
1044 const DecoratorSet expanded_decorators = DecoratorFixup<
1045 (!HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
1046 (MO_SEQ_CST | decorators) : decorators>::value;
1047 // Potentially remember that we need compressed oop awareness
1048 const DecoratorSet final_decorators = expanded_decorators |
1049 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1050 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY);
1051 return PreRuntimeDispatch::atomic_cmpxchg_at<final_decorators>(new_decayed_value, base,
1052 offset, compare_decayed_value);
1053 }
1054
1055 template <DecoratorSet decorators, typename P, typename T>
1056 inline T atomic_xchg(T new_value, P* addr) {
1057 verify_types<decorators, T>();
1058 typedef typename Decay<P>::type DecayedP;
1059 typedef typename Decay<T>::type DecayedT;
1060 DecayedT new_decayed_value = new_value;
1061 // atomic_xchg is only available in SEQ_CST flavour.
1062 const DecoratorSet expanded_decorators = DecoratorFixup<decorators | MO_SEQ_CST>::value;
1063 return atomic_xchg_reduce_types<expanded_decorators>(new_decayed_value,
1064 const_cast<DecayedP*>(addr));
1065 }
1066
1067 template <DecoratorSet decorators, typename T>
1068 inline T atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
1069 verify_types<decorators, T>();
1070 typedef typename Decay<T>::type DecayedT;
1071 DecayedT new_decayed_value = new_value;
1072 // atomic_xchg is only available in SEQ_CST flavour.
1073 const DecoratorSet expanded_decorators = DecoratorFixup<decorators | MO_SEQ_CST |
1074 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1075 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
1076 return PreRuntimeDispatch::atomic_xchg_at<expanded_decorators>(new_decayed_value, base, offset);
1077 }
1078
1079 template <DecoratorSet decorators, typename T>
1080 inline bool arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T *dst, size_t length) {
1081 STATIC_ASSERT((HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ||
1082 (IsSame<T, void>::value || IsIntegral<T>::value) ||
1083 IsFloatingPoint<T>::value)); // arraycopy allows type erased void elements
1084 typedef typename Decay<T>::type DecayedT;
1085 const DecoratorSet expanded_decorators = DecoratorFixup<decorators | IN_HEAP_ARRAY | IN_HEAP |
1086 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1087 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
1088 return PreRuntimeDispatch::arraycopy<expanded_decorators>(src_obj, dst_obj,
1089 const_cast<DecayedT*>(src),
1090 const_cast<DecayedT*>(dst),
1091 length);
1092 }
1093
1094 template <DecoratorSet decorators>
1095 inline void clone(oop src, oop dst, size_t size) {
1096 const DecoratorSet expanded_decorators = DecoratorFixup<decorators>::value;
1097 PreRuntimeDispatch::clone<expanded_decorators>(src, dst, size);
1098 }
1099
1100 template <DecoratorSet decorators>
1101 inline oop resolve(oop obj) {
1102 const DecoratorSet expanded_decorators = DecoratorFixup<decorators>::value;
1103 return PreRuntimeDispatch::resolve<expanded_decorators>(obj);
1104 }
1105 }
1106
1107 template <DecoratorSet decorators>
1108 template <DecoratorSet expected_decorators>
1109 void Access<decorators>::verify_decorators() {
1110 STATIC_ASSERT((~expected_decorators & decorators) == 0); // unexpected decorator used
1111 const DecoratorSet barrier_strength_decorators = decorators & AS_DECORATOR_MASK;
1112 STATIC_ASSERT(barrier_strength_decorators == 0 || ( // make sure barrier strength decorators are disjoint if set
1113 (barrier_strength_decorators ^ AS_NO_KEEPALIVE) == 0 ||
1114 (barrier_strength_decorators ^ AS_DEST_NOT_INITIALIZED) == 0 ||
1115 (barrier_strength_decorators ^ AS_RAW) == 0 ||
1116 (barrier_strength_decorators ^ AS_NORMAL) == 0
1117 ));
1118 const DecoratorSet ref_strength_decorators = decorators & ON_DECORATOR_MASK;
1119 STATIC_ASSERT(ref_strength_decorators == 0 || ( // make sure ref strength decorators are disjoint if set
1120 (ref_strength_decorators ^ ON_STRONG_OOP_REF) == 0 ||
1121 (ref_strength_decorators ^ ON_WEAK_OOP_REF) == 0 ||
1122 (ref_strength_decorators ^ ON_PHANTOM_OOP_REF) == 0 ||
1123 (ref_strength_decorators ^ ON_UNKNOWN_OOP_REF) == 0
1124 ));
1125 const DecoratorSet memory_ordering_decorators = decorators & MO_DECORATOR_MASK;
1126 STATIC_ASSERT(memory_ordering_decorators == 0 || ( // make sure memory ordering decorators are disjoint if set
1127 (memory_ordering_decorators ^ MO_UNORDERED) == 0 ||
1128 (memory_ordering_decorators ^ MO_VOLATILE) == 0 ||
1129 (memory_ordering_decorators ^ MO_RELAXED) == 0 ||
1130 (memory_ordering_decorators ^ MO_ACQUIRE) == 0 ||
1131 (memory_ordering_decorators ^ MO_RELEASE) == 0 ||
1132 (memory_ordering_decorators ^ MO_SEQ_CST) == 0
1133 ));
1134 const DecoratorSet location_decorators = decorators & IN_DECORATOR_MASK;
1135 STATIC_ASSERT(location_decorators == 0 || ( // make sure location decorators are disjoint if set
1136 (location_decorators ^ IN_ROOT) == 0 ||
1137 (location_decorators ^ IN_HEAP) == 0 ||
1138 (location_decorators ^ (IN_HEAP | IN_HEAP_ARRAY)) == 0 ||
1139 (location_decorators ^ (IN_ROOT | IN_CONCURRENT_ROOT)) == 0 ||
1140 (location_decorators ^ (IN_ROOT | IN_ARCHIVE_ROOT)) == 0
1141 ));
1142 }
1143
1144 #endif // SHARE_VM_RUNTIME_ACCESS_INLINE_HPP