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
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7 * published by the Free Software Foundation.
8 *
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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).
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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.
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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 return GCBarrierType::arraycopy_in_heap(src_obj, dst_obj, src, dst, length);
143 }
144
145 template <typename T>
146 static bool oop_access_barrier(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
147 typedef typename HeapOopType<decorators>::type OopType;
148 return GCBarrierType::oop_arraycopy_in_heap(src_obj, dst_obj,
149 reinterpret_cast<OopType*>(src),
150 reinterpret_cast<OopType*>(dst), length);
151 }
152 };
153
154 template <class GCBarrierType, DecoratorSet decorators>
155 struct PostRuntimeDispatch<GCBarrierType, BARRIER_STORE_AT, decorators>: public AllStatic {
156 template <typename T>
157 static void access_barrier(oop base, ptrdiff_t offset, T value) {
158 GCBarrierType::store_in_heap_at(base, offset, value);
159 }
160
161 static void oop_access_barrier(oop base, ptrdiff_t offset, oop value) {
162 GCBarrierType::oop_store_in_heap_at(base, offset, value);
163 }
164 };
165
166 template <class GCBarrierType, DecoratorSet decorators>
167 struct PostRuntimeDispatch<GCBarrierType, BARRIER_LOAD_AT, decorators>: public AllStatic {
168 template <typename T>
169 static T access_barrier(oop base, ptrdiff_t offset) {
170 return GCBarrierType::template load_in_heap_at<T>(base, offset);
171 }
172
173 static oop oop_access_barrier(oop base, ptrdiff_t offset) {
174 return GCBarrierType::oop_load_in_heap_at(base, offset);
175 }
176 };
177
178 template <class GCBarrierType, DecoratorSet decorators>
179 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_XCHG_AT, decorators>: public AllStatic {
180 template <typename T>
181 static T access_barrier(T new_value, oop base, ptrdiff_t offset) {
182 return GCBarrierType::atomic_xchg_in_heap_at(new_value, base, offset);
183 }
184
185 static oop oop_access_barrier(oop new_value, oop base, ptrdiff_t offset) {
186 return GCBarrierType::oop_atomic_xchg_in_heap_at(new_value, base, offset);
187 }
188 };
189
190 template <class GCBarrierType, DecoratorSet decorators>
191 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_CMPXCHG_AT, decorators>: public AllStatic {
192 template <typename T>
193 static T access_barrier(T new_value, oop base, ptrdiff_t offset, T compare_value) {
194 return GCBarrierType::atomic_cmpxchg_in_heap_at(new_value, base, offset, compare_value);
195 }
196
197 static oop oop_access_barrier(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
198 return GCBarrierType::oop_atomic_cmpxchg_in_heap_at(new_value, base, offset, compare_value);
199 }
200 };
201
202 template <class GCBarrierType, DecoratorSet decorators>
203 struct PostRuntimeDispatch<GCBarrierType, BARRIER_CLONE, decorators>: public AllStatic {
204 static void access_barrier(oop src, oop dst, size_t size) {
205 GCBarrierType::clone_in_heap(src, dst, size);
206 }
207 };
208
209 template <class GCBarrierType, DecoratorSet decorators>
210 struct PostRuntimeDispatch<GCBarrierType, BARRIER_RESOLVE, decorators>: public AllStatic {
211 static oop access_barrier(oop obj) {
212 return GCBarrierType::resolve(obj);
213 }
214 };
215
216 // Resolving accessors with barriers from the barrier set happens in two steps.
217 // 1. Expand paths with runtime-decorators, e.g. is UseCompressedOops on or off.
218 // 2. Expand paths for each BarrierSet available in the system.
219 template <DecoratorSet decorators, typename FunctionPointerT, BarrierType barrier_type>
220 struct BarrierResolver: public AllStatic {
221 template <DecoratorSet ds>
222 static typename EnableIf<
223 HasDecorator<ds, INTERNAL_VALUE_IS_OOP>::value,
224 FunctionPointerT>::type
225 resolve_barrier_gc() {
226 BarrierSet* bs = BarrierSet::barrier_set();
227 assert(bs != NULL, "GC barriers invoked before BarrierSet is set");
228 switch (bs->kind()) {
229 #define BARRIER_SET_RESOLVE_BARRIER_CLOSURE(bs_name) \
230 case BarrierSet::bs_name: { \
231 return PostRuntimeDispatch<typename BarrierSet::GetType<BarrierSet::bs_name>::type:: \
232 AccessBarrier<ds>, barrier_type, ds>::oop_access_barrier; \
233 } \
234 break;
235 FOR_EACH_CONCRETE_BARRIER_SET_DO(BARRIER_SET_RESOLVE_BARRIER_CLOSURE)
236 #undef BARRIER_SET_RESOLVE_BARRIER_CLOSURE
237
238 default:
239 fatal("BarrierSet AccessBarrier resolving not implemented");
240 return NULL;
241 };
242 }
243
244 template <DecoratorSet ds>
245 static typename EnableIf<
246 !HasDecorator<ds, INTERNAL_VALUE_IS_OOP>::value,
247 FunctionPointerT>::type
248 resolve_barrier_gc() {
249 BarrierSet* bs = BarrierSet::barrier_set();
250 assert(bs != NULL, "GC barriers invoked before BarrierSet is set");
251 switch (bs->kind()) {
252 #define BARRIER_SET_RESOLVE_BARRIER_CLOSURE(bs_name) \
253 case BarrierSet::bs_name: { \
254 return PostRuntimeDispatch<typename BarrierSet::GetType<BarrierSet::bs_name>::type:: \
255 AccessBarrier<ds>, barrier_type, ds>::access_barrier; \
256 } \
257 break;
258 FOR_EACH_CONCRETE_BARRIER_SET_DO(BARRIER_SET_RESOLVE_BARRIER_CLOSURE)
259 #undef BARRIER_SET_RESOLVE_BARRIER_CLOSURE
260
261 default:
262 fatal("BarrierSet AccessBarrier resolving not implemented");
263 return NULL;
264 };
265 }
266
267 static FunctionPointerT resolve_barrier_rt() {
268 if (UseCompressedOops) {
269 const DecoratorSet expanded_decorators = decorators | INTERNAL_RT_USE_COMPRESSED_OOPS;
270 return resolve_barrier_gc<expanded_decorators>();
271 } else {
272 return resolve_barrier_gc<decorators>();
273 }
274 }
275
276 static FunctionPointerT resolve_barrier() {
277 return resolve_barrier_rt();
278 }
279 };
280
281 // Step 4: Runtime dispatch
282 // The RuntimeDispatch class is responsible for performing a runtime dispatch of the
283 // accessor. This is required when the access either depends on whether compressed oops
284 // is being used, or it depends on which GC implementation was chosen (e.g. requires GC
285 // barriers). The way it works is that a function pointer initially pointing to an
286 // accessor resolution function gets called for each access. Upon first invocation,
287 // it resolves which accessor to be used in future invocations and patches the
288 // function pointer to this new accessor.
289
290 template <DecoratorSet decorators, typename T, BarrierType type>
291 struct RuntimeDispatch: AllStatic {};
292
293 template <DecoratorSet decorators, typename T>
294 struct RuntimeDispatch<decorators, T, BARRIER_STORE>: AllStatic {
295 typedef typename AccessFunction<decorators, T, BARRIER_STORE>::type func_t;
296 static func_t _store_func;
297
298 static void store_init(void* addr, T value) {
299 func_t function = BarrierResolver<decorators, func_t, BARRIER_STORE>::resolve_barrier();
300 _store_func = function;
301 function(addr, value);
302 }
303
304 static inline void store(void* addr, T value) {
305 _store_func(addr, value);
306 }
307 };
308
309 template <DecoratorSet decorators, typename T>
310 struct RuntimeDispatch<decorators, T, BARRIER_STORE_AT>: AllStatic {
311 typedef typename AccessFunction<decorators, T, BARRIER_STORE_AT>::type func_t;
312 static func_t _store_at_func;
313
314 static void store_at_init(oop base, ptrdiff_t offset, T value) {
315 func_t function = BarrierResolver<decorators, func_t, BARRIER_STORE_AT>::resolve_barrier();
316 _store_at_func = function;
317 function(base, offset, value);
318 }
319
320 static inline void store_at(oop base, ptrdiff_t offset, T value) {
321 _store_at_func(base, offset, value);
322 }
323 };
324
325 template <DecoratorSet decorators, typename T>
326 struct RuntimeDispatch<decorators, T, BARRIER_LOAD>: AllStatic {
327 typedef typename AccessFunction<decorators, T, BARRIER_LOAD>::type func_t;
328 static func_t _load_func;
329
330 static T load_init(void* addr) {
331 func_t function = BarrierResolver<decorators, func_t, BARRIER_LOAD>::resolve_barrier();
332 _load_func = function;
333 return function(addr);
334 }
335
336 static inline T load(void* addr) {
337 return _load_func(addr);
338 }
339 };
340
341 template <DecoratorSet decorators, typename T>
342 struct RuntimeDispatch<decorators, T, BARRIER_LOAD_AT>: AllStatic {
343 typedef typename AccessFunction<decorators, T, BARRIER_LOAD_AT>::type func_t;
344 static func_t _load_at_func;
345
346 static T load_at_init(oop base, ptrdiff_t offset) {
347 func_t function = BarrierResolver<decorators, func_t, BARRIER_LOAD_AT>::resolve_barrier();
348 _load_at_func = function;
349 return function(base, offset);
350 }
351
352 static inline T load_at(oop base, ptrdiff_t offset) {
353 return _load_at_func(base, offset);
354 }
355 };
356
357 template <DecoratorSet decorators, typename T>
358 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG>: AllStatic {
359 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG>::type func_t;
360 static func_t _atomic_cmpxchg_func;
361
362 static T atomic_cmpxchg_init(T new_value, void* addr, T compare_value) {
363 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_CMPXCHG>::resolve_barrier();
364 _atomic_cmpxchg_func = function;
365 return function(new_value, addr, compare_value);
366 }
367
368 static inline T atomic_cmpxchg(T new_value, void* addr, T compare_value) {
369 return _atomic_cmpxchg_func(new_value, addr, compare_value);
370 }
371 };
372
373 template <DecoratorSet decorators, typename T>
374 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>: AllStatic {
375 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::type func_t;
376 static func_t _atomic_cmpxchg_at_func;
377
378 static T atomic_cmpxchg_at_init(T new_value, oop base, ptrdiff_t offset, T compare_value) {
379 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_CMPXCHG_AT>::resolve_barrier();
380 _atomic_cmpxchg_at_func = function;
381 return function(new_value, base, offset, compare_value);
382 }
383
384 static inline T atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
385 return _atomic_cmpxchg_at_func(new_value, base, offset, compare_value);
386 }
387 };
388
389 template <DecoratorSet decorators, typename T>
390 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG>: AllStatic {
391 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG>::type func_t;
392 static func_t _atomic_xchg_func;
393
394 static T atomic_xchg_init(T new_value, void* addr) {
395 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_XCHG>::resolve_barrier();
396 _atomic_xchg_func = function;
397 return function(new_value, addr);
398 }
399
400 static inline T atomic_xchg(T new_value, void* addr) {
401 return _atomic_xchg_func(new_value, addr);
402 }
403 };
404
405 template <DecoratorSet decorators, typename T>
406 struct RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG_AT>: AllStatic {
407 typedef typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG_AT>::type func_t;
408 static func_t _atomic_xchg_at_func;
409
410 static T atomic_xchg_at_init(T new_value, oop base, ptrdiff_t offset) {
411 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_XCHG_AT>::resolve_barrier();
412 _atomic_xchg_at_func = function;
413 return function(new_value, base, offset);
414 }
415
416 static inline T atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
417 return _atomic_xchg_at_func(new_value, base, offset);
418 }
419 };
420
421 template <DecoratorSet decorators, typename T>
422 struct RuntimeDispatch<decorators, T, BARRIER_ARRAYCOPY>: AllStatic {
423 typedef typename AccessFunction<decorators, T, BARRIER_ARRAYCOPY>::type func_t;
424 static func_t _arraycopy_func;
425
426 static bool arraycopy_init(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
427 func_t function = BarrierResolver<decorators, func_t, BARRIER_ARRAYCOPY>::resolve_barrier();
428 _arraycopy_func = function;
429 return function(src_obj, dst_obj, src, dst, length);
430 }
431
432 static inline bool arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
433 return _arraycopy_func(src_obj, dst_obj, src, dst, length);
434 }
435 };
436
437 template <DecoratorSet decorators, typename T>
438 struct RuntimeDispatch<decorators, T, BARRIER_CLONE>: AllStatic {
439 typedef typename AccessFunction<decorators, T, BARRIER_CLONE>::type func_t;
440 static func_t _clone_func;
441
442 static void clone_init(oop src, oop dst, size_t size) {
443 func_t function = BarrierResolver<decorators, func_t, BARRIER_CLONE>::resolve_barrier();
444 _clone_func = function;
445 function(src, dst, size);
446 }
447
448 static inline void clone(oop src, oop dst, size_t size) {
449 _clone_func(src, dst, size);
450 }
451 };
452
453 template <DecoratorSet decorators, typename T>
454 struct RuntimeDispatch<decorators, T, BARRIER_RESOLVE>: AllStatic {
455 typedef typename AccessFunction<decorators, T, BARRIER_RESOLVE>::type func_t;
456 static func_t _resolve_func;
457
458 static oop resolve_init(oop obj) {
459 func_t function = BarrierResolver<decorators, func_t, BARRIER_RESOLVE>::resolve_barrier();
460 _resolve_func = function;
461 return function(obj);
462 }
463
464 static inline oop resolve(oop obj) {
465 return _resolve_func(obj);
466 }
467 };
468
469 // Initialize the function pointers to point to the resolving function.
470 template <DecoratorSet decorators, typename T>
471 typename AccessFunction<decorators, T, BARRIER_STORE>::type
472 RuntimeDispatch<decorators, T, BARRIER_STORE>::_store_func = &store_init;
473
474 template <DecoratorSet decorators, typename T>
475 typename AccessFunction<decorators, T, BARRIER_STORE_AT>::type
476 RuntimeDispatch<decorators, T, BARRIER_STORE_AT>::_store_at_func = &store_at_init;
477
478 template <DecoratorSet decorators, typename T>
479 typename AccessFunction<decorators, T, BARRIER_LOAD>::type
480 RuntimeDispatch<decorators, T, BARRIER_LOAD>::_load_func = &load_init;
481
482 template <DecoratorSet decorators, typename T>
483 typename AccessFunction<decorators, T, BARRIER_LOAD_AT>::type
484 RuntimeDispatch<decorators, T, BARRIER_LOAD_AT>::_load_at_func = &load_at_init;
485
486 template <DecoratorSet decorators, typename T>
487 typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG>::type
488 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG>::_atomic_cmpxchg_func = &atomic_cmpxchg_init;
489
490 template <DecoratorSet decorators, typename T>
491 typename AccessFunction<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::type
492 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::_atomic_cmpxchg_at_func = &atomic_cmpxchg_at_init;
493
494 template <DecoratorSet decorators, typename T>
495 typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG>::type
496 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG>::_atomic_xchg_func = &atomic_xchg_init;
497
498 template <DecoratorSet decorators, typename T>
499 typename AccessFunction<decorators, T, BARRIER_ATOMIC_XCHG_AT>::type
500 RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG_AT>::_atomic_xchg_at_func = &atomic_xchg_at_init;
501
502 template <DecoratorSet decorators, typename T>
503 typename AccessFunction<decorators, T, BARRIER_ARRAYCOPY>::type
504 RuntimeDispatch<decorators, T, BARRIER_ARRAYCOPY>::_arraycopy_func = &arraycopy_init;
505
506 template <DecoratorSet decorators, typename T>
507 typename AccessFunction<decorators, T, BARRIER_CLONE>::type
508 RuntimeDispatch<decorators, T, BARRIER_CLONE>::_clone_func = &clone_init;
509
510 template <DecoratorSet decorators, typename T>
511 typename AccessFunction<decorators, T, BARRIER_RESOLVE>::type
512 RuntimeDispatch<decorators, T, BARRIER_RESOLVE>::_resolve_func = &resolve_init;
513
514 // Step 3: Pre-runtime dispatching.
515 // The PreRuntimeDispatch class is responsible for filtering the barrier strength
516 // decorators. That is, for AS_RAW, it hardwires the accesses without a runtime
517 // dispatch point. Otherwise it goes through a runtime check if hardwiring was
518 // not possible.
519 struct PreRuntimeDispatch: AllStatic {
520 template<DecoratorSet decorators>
521 struct CanHardwireRaw: public IntegralConstant<
522 bool,
523 !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value || // primitive access
524 !HasDecorator<decorators, INTERNAL_CONVERT_COMPRESSED_OOP>::value || // don't care about compressed oops (oop* address)
525 HasDecorator<decorators, INTERNAL_RT_USE_COMPRESSED_OOPS>::value> // we can infer we use compressed oops (narrowOop* address)
526 {};
527
528 static const DecoratorSet convert_compressed_oops = INTERNAL_RT_USE_COMPRESSED_OOPS | INTERNAL_CONVERT_COMPRESSED_OOP;
529
530 template<DecoratorSet decorators>
531 static bool is_hardwired_primitive() {
532 return !HasDecorator<decorators, INTERNAL_BT_BARRIER_ON_PRIMITIVES>::value &&
533 !HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value;
534 }
535
536 template <DecoratorSet decorators, typename T>
537 inline static typename EnableIf<
538 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value>::type
539 store(void* addr, T value) {
540 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
541 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
542 Raw::oop_store(addr, value);
543 } else {
544 Raw::store(addr, value);
545 }
546 }
547
548 template <DecoratorSet decorators, typename T>
549 inline static typename EnableIf<
550 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value>::type
551 store(void* addr, T value) {
552 if (UseCompressedOops) {
553 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
554 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
555 } else {
556 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
557 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
558 }
559 }
560
561 template <DecoratorSet decorators, typename T>
562 inline static typename EnableIf<
563 !HasDecorator<decorators, AS_RAW>::value>::type
564 store(void* addr, T value) {
565 if (is_hardwired_primitive<decorators>()) {
566 const DecoratorSet expanded_decorators = decorators | AS_RAW;
567 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
568 } else {
569 RuntimeDispatch<decorators, T, BARRIER_STORE>::store(addr, value);
570 }
571 }
572
573 template <DecoratorSet decorators, typename T>
574 inline static typename EnableIf<
575 HasDecorator<decorators, AS_RAW>::value>::type
576 store_at(oop base, ptrdiff_t offset, T value) {
577 store<decorators>(field_addr(base, offset), value);
578 }
579
580 template <DecoratorSet decorators, typename T>
581 inline static typename EnableIf<
582 !HasDecorator<decorators, AS_RAW>::value>::type
583 store_at(oop base, ptrdiff_t offset, T value) {
584 if (is_hardwired_primitive<decorators>()) {
585 const DecoratorSet expanded_decorators = decorators | AS_RAW;
586 PreRuntimeDispatch::store_at<expanded_decorators>(base, offset, value);
587 } else {
588 RuntimeDispatch<decorators, T, BARRIER_STORE_AT>::store_at(base, offset, value);
589 }
590 }
591
592 template <DecoratorSet decorators, typename T>
593 inline static typename EnableIf<
594 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
595 load(void* addr) {
596 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
597 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
598 return Raw::template oop_load<T>(addr);
599 } else {
600 return Raw::template load<T>(addr);
601 }
602 }
603
604 template <DecoratorSet decorators, typename T>
605 inline static typename EnableIf<
606 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
607 load(void* addr) {
608 if (UseCompressedOops) {
609 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
610 return PreRuntimeDispatch::load<expanded_decorators, T>(addr);
611 } else {
612 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
613 return PreRuntimeDispatch::load<expanded_decorators, T>(addr);
614 }
615 }
616
617 template <DecoratorSet decorators, typename T>
618 inline static typename EnableIf<
619 !HasDecorator<decorators, AS_RAW>::value, T>::type
620 load(void* addr) {
621 if (is_hardwired_primitive<decorators>()) {
622 const DecoratorSet expanded_decorators = decorators | AS_RAW;
623 return PreRuntimeDispatch::load<expanded_decorators, T>(addr);
624 } else {
625 return RuntimeDispatch<decorators, T, BARRIER_LOAD>::load(addr);
626 }
627 }
628
629 template <DecoratorSet decorators, typename T>
630 inline static typename EnableIf<
631 HasDecorator<decorators, AS_RAW>::value, T>::type
632 load_at(oop base, ptrdiff_t offset) {
633 return load<decorators, T>(field_addr(base, offset));
634 }
635
636 template <DecoratorSet decorators, typename T>
637 inline static typename EnableIf<
638 !HasDecorator<decorators, AS_RAW>::value, T>::type
639 load_at(oop base, ptrdiff_t offset) {
640 if (is_hardwired_primitive<decorators>()) {
641 const DecoratorSet expanded_decorators = decorators | AS_RAW;
642 return PreRuntimeDispatch::load_at<expanded_decorators, T>(base, offset);
643 } else {
644 return RuntimeDispatch<decorators, T, BARRIER_LOAD_AT>::load_at(base, offset);
645 }
646 }
647
648 template <DecoratorSet decorators, typename T>
649 inline static typename EnableIf<
650 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
651 atomic_cmpxchg(T new_value, void* addr, T compare_value) {
652 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
653 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
654 return Raw::oop_atomic_cmpxchg(new_value, addr, compare_value);
655 } else {
656 return Raw::atomic_cmpxchg(new_value, addr, compare_value);
657 }
658 }
659
660 template <DecoratorSet decorators, typename T>
661 inline static typename EnableIf<
662 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
663 atomic_cmpxchg(T new_value, void* addr, T compare_value) {
664 if (UseCompressedOops) {
665 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
666 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
667 } else {
668 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
669 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
670 }
671 }
672
673 template <DecoratorSet decorators, typename T>
674 inline static typename EnableIf<
675 !HasDecorator<decorators, AS_RAW>::value, T>::type
676 atomic_cmpxchg(T new_value, void* addr, T compare_value) {
677 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
678 if (is_hardwired_primitive<decorators>()) {
679 const DecoratorSet expanded_decorators = decorators | AS_RAW;
680 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
681 } else {
682 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG>::atomic_cmpxchg(new_value, addr, compare_value);
683 }
684 }
685
686 template <DecoratorSet decorators, typename T>
687 inline static typename EnableIf<
688 HasDecorator<decorators, AS_RAW>::value, T>::type
689 atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
690 return atomic_cmpxchg<decorators>(new_value, field_addr(base, offset), compare_value);
691 }
692
693 template <DecoratorSet decorators, typename T>
694 inline static typename EnableIf<
695 !HasDecorator<decorators, AS_RAW>::value, T>::type
696 atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
697 if (is_hardwired_primitive<decorators>()) {
698 const DecoratorSet expanded_decorators = decorators | AS_RAW;
699 return PreRuntimeDispatch::atomic_cmpxchg_at<expanded_decorators>(new_value, base, offset, compare_value);
700 } else {
701 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::atomic_cmpxchg_at(new_value, base, offset, compare_value);
702 }
703 }
704
705 template <DecoratorSet decorators, typename T>
706 inline static typename EnableIf<
707 HasDecorator<decorators, AS_RAW>::value && CanHardwireRaw<decorators>::value, T>::type
708 atomic_xchg(T new_value, void* addr) {
709 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
710 if (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value) {
711 return Raw::oop_atomic_xchg(new_value, addr);
712 } else {
713 return Raw::atomic_xchg(new_value, addr);
714 }
715 }
716
717 template <DecoratorSet decorators, typename T>
718 inline static typename EnableIf<
719 HasDecorator<decorators, AS_RAW>::value && !CanHardwireRaw<decorators>::value, T>::type
720 atomic_xchg(T new_value, void* addr) {
721 if (UseCompressedOops) {
722 const DecoratorSet expanded_decorators = decorators | convert_compressed_oops;
723 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
724 } else {
725 const DecoratorSet expanded_decorators = decorators & ~convert_compressed_oops;
726 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
727 }
728 }
729
730 template <DecoratorSet decorators, typename T>
731 inline static typename EnableIf<
732 !HasDecorator<decorators, AS_RAW>::value, T>::type
733 atomic_xchg(T new_value, void* addr) {
734 if (is_hardwired_primitive<decorators>()) {
735 const DecoratorSet expanded_decorators = decorators | AS_RAW;
736 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
737 } else {
738 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG>::atomic_xchg(new_value, addr);
739 }
740 }
741
742 template <DecoratorSet decorators, typename T>
743 inline static typename EnableIf<
744 HasDecorator<decorators, AS_RAW>::value, T>::type
745 atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
746 return atomic_xchg<decorators>(new_value, field_addr(base, offset));
747 }
748
749 template <DecoratorSet decorators, typename T>
750 inline static typename EnableIf<
751 !HasDecorator<decorators, AS_RAW>::value, T>::type
752 atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
753 if (is_hardwired_primitive<decorators>()) {
754 const DecoratorSet expanded_decorators = decorators | AS_RAW;
755 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, base, offset);
756 } else {
757 return RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG_AT>::atomic_xchg_at(new_value, base, offset);
758 }
759 }
760
761 template <DecoratorSet decorators, typename T>
762 inline static typename EnableIf<
763 HasDecorator<decorators, AS_RAW>::value, bool>::type
764 arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
765 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
766 return Raw::arraycopy(src, dst, length);
767 }
768
769 template <DecoratorSet decorators, typename T>
770 inline static typename EnableIf<
771 !HasDecorator<decorators, AS_RAW>::value, bool>::type
772 arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
773 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
774 if (is_hardwired_primitive<decorators>()) {
775 const DecoratorSet expanded_decorators = decorators | AS_RAW;
776 return PreRuntimeDispatch::arraycopy<expanded_decorators>(src_obj, dst_obj, src, dst, length);
777 } else {
778 return RuntimeDispatch<decorators, T, BARRIER_ARRAYCOPY>::arraycopy(src_obj, dst_obj, src, dst, length);
779 }
780 }
781
782 template <DecoratorSet decorators>
783 inline static typename EnableIf<
784 HasDecorator<decorators, AS_RAW>::value>::type
785 clone(oop src, oop dst, size_t size) {
786 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
787 Raw::clone(src, dst, size);
788 }
789
790 template <DecoratorSet decorators>
791 inline static typename EnableIf<
792 !HasDecorator<decorators, AS_RAW>::value>::type
793 clone(oop src, oop dst, size_t size) {
794 RuntimeDispatch<decorators, oop, BARRIER_CLONE>::clone(src, dst, size);
795 }
796
797 template <DecoratorSet decorators>
798 inline static typename EnableIf<
799 HasDecorator<decorators, INTERNAL_BT_TO_SPACE_INVARIANT>::value, oop>::type
800 resolve(oop obj) {
801 typedef RawAccessBarrier<decorators & RAW_DECORATOR_MASK> Raw;
802 return Raw::resolve(obj);
803 }
804
805 template <DecoratorSet decorators>
806 inline static typename EnableIf<
807 !HasDecorator<decorators, INTERNAL_BT_TO_SPACE_INVARIANT>::value, oop>::type
808 resolve(oop obj) {
809 return RuntimeDispatch<decorators, oop, BARRIER_RESOLVE>::resolve(obj);
810 }
811 };
812
813 // This class adds implied decorators that follow according to decorator rules.
814 // For example adding default reference strength and default memory ordering
815 // semantics.
816 template <DecoratorSet input_decorators>
817 struct DecoratorFixup: AllStatic {
818 // If no reference strength has been picked, then strong will be picked
819 static const DecoratorSet ref_strength_default = input_decorators |
820 (((ON_DECORATOR_MASK & input_decorators) == 0 && (INTERNAL_VALUE_IS_OOP & input_decorators) != 0) ?
821 ON_STRONG_OOP_REF : INTERNAL_EMPTY);
822 // If no memory ordering has been picked, unordered will be picked
823 static const DecoratorSet memory_ordering_default = ref_strength_default |
824 ((MO_DECORATOR_MASK & ref_strength_default) == 0 ? MO_UNORDERED : INTERNAL_EMPTY);
825 // If no barrier strength has been picked, normal will be used
826 static const DecoratorSet barrier_strength_default = memory_ordering_default |
827 ((AS_DECORATOR_MASK & memory_ordering_default) == 0 ? AS_NORMAL : INTERNAL_EMPTY);
828 // Heap array accesses imply it is a heap access
829 static const DecoratorSet heap_array_is_in_heap = barrier_strength_default |
830 ((IN_HEAP_ARRAY & barrier_strength_default) != 0 ? IN_HEAP : INTERNAL_EMPTY);
831 static const DecoratorSet conc_root_is_root = heap_array_is_in_heap |
832 ((IN_CONCURRENT_ROOT & heap_array_is_in_heap) != 0 ? IN_ROOT : INTERNAL_EMPTY);
833 static const DecoratorSet archive_root_is_root = conc_root_is_root |
834 ((IN_ARCHIVE_ROOT & conc_root_is_root) != 0 ? IN_ROOT : INTERNAL_EMPTY);
835 static const DecoratorSet value = archive_root_is_root | BT_BUILDTIME_DECORATORS;
836 };
837
838 // Step 2: Reduce types.
839 // Enforce that for non-oop types, T and P have to be strictly the same.
840 // P is the type of the address and T is the type of the values.
841 // As for oop types, it is allow to send T in {narrowOop, oop} and
842 // P in {narrowOop, oop, HeapWord*}. The following rules apply according to
843 // the subsequent table. (columns are P, rows are T)
844 // | | HeapWord | oop | narrowOop |
845 // | oop | rt-comp | hw-none | hw-comp |
846 // | narrowOop | x | x | hw-none |
847 //
848 // x means not allowed
849 // rt-comp means it must be checked at runtime whether the oop is compressed.
850 // hw-none means it is statically known the oop will not be compressed.
851 // hw-comp means it is statically known the oop will be compressed.
852
853 template <DecoratorSet decorators, typename T>
854 inline void store_reduce_types(T* addr, T value) {
855 PreRuntimeDispatch::store<decorators>(addr, value);
856 }
857
858 template <DecoratorSet decorators>
859 inline void store_reduce_types(narrowOop* addr, oop value) {
860 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
861 INTERNAL_RT_USE_COMPRESSED_OOPS;
862 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
863 }
864
865 template <DecoratorSet decorators>
866 inline void store_reduce_types(narrowOop* addr, narrowOop value) {
867 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
868 INTERNAL_RT_USE_COMPRESSED_OOPS;
869 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
870 }
871
872 template <DecoratorSet decorators>
873 inline void store_reduce_types(HeapWord* addr, oop value) {
874 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
875 PreRuntimeDispatch::store<expanded_decorators>(addr, value);
876 }
877
878 template <DecoratorSet decorators, typename T>
879 inline T atomic_cmpxchg_reduce_types(T new_value, T* addr, T compare_value) {
880 return PreRuntimeDispatch::atomic_cmpxchg<decorators>(new_value, addr, compare_value);
881 }
882
883 template <DecoratorSet decorators>
884 inline oop atomic_cmpxchg_reduce_types(oop new_value, narrowOop* addr, oop compare_value) {
885 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
886 INTERNAL_RT_USE_COMPRESSED_OOPS;
887 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
888 }
889
890 template <DecoratorSet decorators>
891 inline narrowOop atomic_cmpxchg_reduce_types(narrowOop new_value, narrowOop* addr, narrowOop compare_value) {
892 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
893 INTERNAL_RT_USE_COMPRESSED_OOPS;
894 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
895 }
896
897 template <DecoratorSet decorators>
898 inline oop atomic_cmpxchg_reduce_types(oop new_value,
899 HeapWord* addr,
900 oop compare_value) {
901 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
902 return PreRuntimeDispatch::atomic_cmpxchg<expanded_decorators>(new_value, addr, compare_value);
903 }
904
905 template <DecoratorSet decorators, typename T>
906 inline T atomic_xchg_reduce_types(T new_value, T* addr) {
907 const DecoratorSet expanded_decorators = decorators;
908 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
909 }
910
911 template <DecoratorSet decorators>
912 inline oop atomic_xchg_reduce_types(oop new_value, narrowOop* addr) {
913 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
914 INTERNAL_RT_USE_COMPRESSED_OOPS;
915 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
916 }
917
918 template <DecoratorSet decorators>
919 inline narrowOop atomic_xchg_reduce_types(narrowOop new_value, narrowOop* addr) {
920 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
921 INTERNAL_RT_USE_COMPRESSED_OOPS;
922 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
923 }
924
925 template <DecoratorSet decorators>
926 inline oop atomic_xchg_reduce_types(oop new_value, HeapWord* addr) {
927 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
928 return PreRuntimeDispatch::atomic_xchg<expanded_decorators>(new_value, addr);
929 }
930
931 template <DecoratorSet decorators, typename T>
932 inline T load_reduce_types(T* addr) {
933 return PreRuntimeDispatch::load<decorators, T>(addr);
934 }
935
936 template <DecoratorSet decorators, typename T>
937 inline typename OopOrNarrowOop<T>::type load_reduce_types(narrowOop* addr) {
938 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP |
939 INTERNAL_RT_USE_COMPRESSED_OOPS;
940 return PreRuntimeDispatch::load<expanded_decorators, typename OopOrNarrowOop<T>::type>(addr);
941 }
942
943 template <DecoratorSet decorators, typename T>
944 inline oop load_reduce_types(HeapWord* addr) {
945 const DecoratorSet expanded_decorators = decorators | INTERNAL_CONVERT_COMPRESSED_OOP;
946 return PreRuntimeDispatch::load<expanded_decorators, oop>(addr);
947 }
948
949 // Step 1: Set default decorators. This step remembers if a type was volatile
950 // and then sets the MO_VOLATILE decorator by default. Otherwise, a default
951 // memory ordering is set for the access, and the implied decorator rules
952 // are applied to select sensible defaults for decorators that have not been
953 // explicitly set. For example, default object referent strength is set to strong.
954 // This step also decays the types passed in (e.g. getting rid of CV qualifiers
955 // and references from the types). This step also perform some type verification
956 // that the passed in types make sense.
957
958 template <DecoratorSet decorators, typename T>
959 static void verify_types(){
960 // If this fails to compile, then you have sent in something that is
961 // not recognized as a valid primitive type to a primitive Access function.
962 STATIC_ASSERT((HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value || // oops have already been validated
963 (IsPointer<T>::value || IsIntegral<T>::value) ||
964 IsFloatingPoint<T>::value)); // not allowed primitive type
965 }
966
967 template <DecoratorSet decorators, typename P, typename T>
968 inline void store(P* addr, T value) {
969 verify_types<decorators, T>();
970 typedef typename Decay<P>::type DecayedP;
971 typedef typename Decay<T>::type DecayedT;
972 DecayedT decayed_value = value;
973 // If a volatile address is passed in but no memory ordering decorator,
974 // set the memory ordering to MO_VOLATILE by default.
975 const DecoratorSet expanded_decorators = DecoratorFixup<
976 (IsVolatile<P>::value && !HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
977 (MO_VOLATILE | decorators) : decorators>::value;
978 store_reduce_types<expanded_decorators>(const_cast<DecayedP*>(addr), decayed_value);
979 }
980
981 template <DecoratorSet decorators, typename T>
982 inline void store_at(oop base, ptrdiff_t offset, T value) {
983 verify_types<decorators, T>();
984 typedef typename Decay<T>::type DecayedT;
985 DecayedT decayed_value = value;
986 const DecoratorSet expanded_decorators = DecoratorFixup<decorators |
987 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
988 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
989 PreRuntimeDispatch::store_at<expanded_decorators>(base, offset, decayed_value);
990 }
991
992 template <DecoratorSet decorators, typename P, typename T>
993 inline T load(P* addr) {
994 verify_types<decorators, T>();
995 typedef typename Decay<P>::type DecayedP;
996 typedef typename Conditional<HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value,
997 typename OopOrNarrowOop<T>::type,
998 typename Decay<T>::type>::type DecayedT;
999 // If a volatile address is passed in but no memory ordering decorator,
1000 // set the memory ordering to MO_VOLATILE by default.
1001 const DecoratorSet expanded_decorators = DecoratorFixup<
1002 (IsVolatile<P>::value && !HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
1003 (MO_VOLATILE | decorators) : decorators>::value;
1004 return load_reduce_types<expanded_decorators, DecayedT>(const_cast<DecayedP*>(addr));
1005 }
1006
1007 template <DecoratorSet decorators, typename T>
1008 inline T load_at(oop base, ptrdiff_t offset) {
1009 verify_types<decorators, T>();
1010 typedef typename Conditional<HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value,
1011 typename OopOrNarrowOop<T>::type,
1012 typename Decay<T>::type>::type DecayedT;
1013 // Expand the decorators (figure out sensible defaults)
1014 // Potentially remember if we need compressed oop awareness
1015 const DecoratorSet expanded_decorators = DecoratorFixup<decorators |
1016 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1017 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
1018 return PreRuntimeDispatch::load_at<expanded_decorators, DecayedT>(base, offset);
1019 }
1020
1021 template <DecoratorSet decorators, typename P, typename T>
1022 inline T atomic_cmpxchg(T new_value, P* addr, T compare_value) {
1023 verify_types<decorators, T>();
1024 typedef typename Decay<P>::type DecayedP;
1025 typedef typename Decay<T>::type DecayedT;
1026 DecayedT new_decayed_value = new_value;
1027 DecayedT compare_decayed_value = compare_value;
1028 const DecoratorSet expanded_decorators = DecoratorFixup<
1029 (!HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
1030 (MO_SEQ_CST | decorators) : decorators>::value;
1031 return atomic_cmpxchg_reduce_types<expanded_decorators>(new_decayed_value,
1032 const_cast<DecayedP*>(addr),
1033 compare_decayed_value);
1034 }
1035
1036 template <DecoratorSet decorators, typename T>
1037 inline T atomic_cmpxchg_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
1038 verify_types<decorators, T>();
1039 typedef typename Decay<T>::type DecayedT;
1040 DecayedT new_decayed_value = new_value;
1041 DecayedT compare_decayed_value = compare_value;
1042 // Determine default memory ordering
1043 const DecoratorSet expanded_decorators = DecoratorFixup<
1044 (!HasDecorator<decorators, MO_DECORATOR_MASK>::value) ?
1045 (MO_SEQ_CST | decorators) : decorators>::value;
1046 // Potentially remember that we need compressed oop awareness
1047 const DecoratorSet final_decorators = expanded_decorators |
1048 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1049 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY);
1050 return PreRuntimeDispatch::atomic_cmpxchg_at<final_decorators>(new_decayed_value, base,
1051 offset, compare_decayed_value);
1052 }
1053
1054 template <DecoratorSet decorators, typename P, typename T>
1055 inline T atomic_xchg(T new_value, P* addr) {
1056 verify_types<decorators, T>();
1057 typedef typename Decay<P>::type DecayedP;
1058 typedef typename Decay<T>::type DecayedT;
1059 DecayedT new_decayed_value = new_value;
1060 // atomic_xchg is only available in SEQ_CST flavour.
1061 const DecoratorSet expanded_decorators = DecoratorFixup<decorators | MO_SEQ_CST>::value;
1062 return atomic_xchg_reduce_types<expanded_decorators>(new_decayed_value,
1063 const_cast<DecayedP*>(addr));
1064 }
1065
1066 template <DecoratorSet decorators, typename T>
1067 inline T atomic_xchg_at(T new_value, oop base, ptrdiff_t offset) {
1068 verify_types<decorators, T>();
1069 typedef typename Decay<T>::type DecayedT;
1070 DecayedT new_decayed_value = new_value;
1071 // atomic_xchg is only available in SEQ_CST flavour.
1072 const DecoratorSet expanded_decorators = DecoratorFixup<decorators | MO_SEQ_CST |
1073 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1074 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
1075 return PreRuntimeDispatch::atomic_xchg_at<expanded_decorators>(new_decayed_value, base, offset);
1076 }
1077
1078 template <DecoratorSet decorators, typename T>
1079 inline bool arraycopy(arrayOop src_obj, arrayOop dst_obj, T *src, T *dst, size_t length) {
1080 verify_types<decorators, T>();
1081 typedef typename Decay<T>::type DecayedT;
1082 const DecoratorSet expanded_decorators = DecoratorFixup<decorators | IN_HEAP_ARRAY | IN_HEAP |
1083 (HasDecorator<decorators, INTERNAL_VALUE_IS_OOP>::value ?
1084 INTERNAL_CONVERT_COMPRESSED_OOP : INTERNAL_EMPTY)>::value;
1085 return PreRuntimeDispatch::arraycopy<expanded_decorators>(src_obj, dst_obj,
1086 const_cast<DecayedT*>(src),
1087 const_cast<DecayedT*>(dst),
1088 length);
1089 }
1090
1091 template <DecoratorSet decorators>
1092 inline void clone(oop src, oop dst, size_t size) {
1093 const DecoratorSet expanded_decorators = DecoratorFixup<decorators>::value;
1094 PreRuntimeDispatch::clone<expanded_decorators>(src, dst, size);
1095 }
1096
1097 template <DecoratorSet decorators>
1098 inline oop resolve(oop obj) {
1099 const DecoratorSet expanded_decorators = DecoratorFixup<decorators>::value;
1100 return PreRuntimeDispatch::resolve<expanded_decorators>(obj);
1101 }
1102 }
1103
1104 template <DecoratorSet decorators>
1105 template <DecoratorSet expected_decorators>
1106 void Access<decorators>::verify_decorators() {
1107 STATIC_ASSERT((~expected_decorators & decorators) == 0); // unexpected decorator used
1108 const DecoratorSet barrier_strength_decorators = decorators & AS_DECORATOR_MASK;
1109 STATIC_ASSERT(barrier_strength_decorators == 0 || ( // make sure barrier strength decorators are disjoint if set
1110 (barrier_strength_decorators ^ AS_NO_KEEPALIVE) == 0 ||
1111 (barrier_strength_decorators ^ AS_DEST_NOT_INITIALIZED) == 0 ||
1112 (barrier_strength_decorators ^ AS_RAW) == 0 ||
1113 (barrier_strength_decorators ^ AS_NORMAL) == 0
1114 ));
1115 const DecoratorSet ref_strength_decorators = decorators & ON_DECORATOR_MASK;
1116 STATIC_ASSERT(ref_strength_decorators == 0 || ( // make sure ref strength decorators are disjoint if set
1117 (ref_strength_decorators ^ ON_STRONG_OOP_REF) == 0 ||
1118 (ref_strength_decorators ^ ON_WEAK_OOP_REF) == 0 ||
1119 (ref_strength_decorators ^ ON_PHANTOM_OOP_REF) == 0 ||
1120 (ref_strength_decorators ^ ON_UNKNOWN_OOP_REF) == 0
1121 ));
1122 const DecoratorSet memory_ordering_decorators = decorators & MO_DECORATOR_MASK;
1123 STATIC_ASSERT(memory_ordering_decorators == 0 || ( // make sure memory ordering decorators are disjoint if set
1124 (memory_ordering_decorators ^ MO_UNORDERED) == 0 ||
1125 (memory_ordering_decorators ^ MO_VOLATILE) == 0 ||
1126 (memory_ordering_decorators ^ MO_RELAXED) == 0 ||
1127 (memory_ordering_decorators ^ MO_ACQUIRE) == 0 ||
1128 (memory_ordering_decorators ^ MO_RELEASE) == 0 ||
1129 (memory_ordering_decorators ^ MO_SEQ_CST) == 0
1130 ));
1131 const DecoratorSet location_decorators = decorators & IN_DECORATOR_MASK;
1132 STATIC_ASSERT(location_decorators == 0 || ( // make sure location decorators are disjoint if set
1133 (location_decorators ^ IN_ROOT) == 0 ||
1134 (location_decorators ^ IN_HEAP) == 0 ||
1135 (location_decorators ^ (IN_HEAP | IN_HEAP_ARRAY)) == 0 ||
1136 (location_decorators ^ (IN_ROOT | IN_CONCURRENT_ROOT)) == 0 ||
1137 (location_decorators ^ (IN_ROOT | IN_ARCHIVE_ROOT)) == 0
1138 ));
1139 }
1140
1141 #endif // SHARE_VM_RUNTIME_ACCESS_INLINE_HPP