1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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13 * accompanied this code).
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23 */
24
25 #ifndef SHARE_OOPS_ACCESS_INLINE_HPP
26 #define SHARE_OOPS_ACCESS_INLINE_HPP
27
28 #include "gc/shared/barrierSetConfig.inline.hpp"
29 #include "oops/access.hpp"
30 #include "oops/accessBackend.inline.hpp"
31
32 // This file outlines the last 2 steps of the template pipeline of accesses going through
33 // the Access API.
34 // * Step 5.a: Barrier resolution. This step is invoked the first time a runtime-dispatch
35 // happens for an access. The appropriate BarrierSet::AccessBarrier accessor
36 // is resolved, then the function pointer is updated to that accessor for
37 // future invocations.
38 // * Step 5.b: Post-runtime dispatch. This step now casts previously unknown types such
39 // as the address type of an oop on the heap (is it oop* or narrowOop*) to
40 // the appropriate type. It also splits sufficiently orthogonal accesses into
41 // different functions, such as whether the access involves oops or primitives
42 // and whether the access is performed on the heap or outside. Then the
43 // appropriate BarrierSet::AccessBarrier is called to perform the access.
44
45 namespace AccessInternal {
46 // Step 5.b: Post-runtime dispatch.
47 // This class is the last step before calling the BarrierSet::AccessBarrier.
48 // Here we make sure to figure out types that were not known prior to the
49 // runtime dispatch, such as whether an oop on the heap is oop or narrowOop.
50 // We also split orthogonal barriers such as handling primitives vs oops
51 // and on-heap vs off-heap into different calls to the barrier set.
52 template <class GCBarrierType, BarrierType type, DecoratorSet decorators>
53 struct PostRuntimeDispatch: public AllStatic { };
54
55 template <class GCBarrierType, DecoratorSet decorators>
56 struct PostRuntimeDispatch<GCBarrierType, BARRIER_STORE, decorators>: public AllStatic {
57 template <typename T>
58 static void access_barrier(void* addr, T value) {
59 GCBarrierType::store_in_heap(reinterpret_cast<T*>(addr), value);
60 }
61
62 static void oop_access_barrier(void* addr, oop value) {
63 typedef typename HeapOopType<decorators>::type OopType;
64 if (HasDecorator<decorators, IN_HEAP>::value) {
65 GCBarrierType::oop_store_in_heap(reinterpret_cast<OopType*>(addr), value);
66 } else {
67 GCBarrierType::oop_store_not_in_heap(reinterpret_cast<OopType*>(addr), value);
68 }
69 }
70 };
71
72 template <class GCBarrierType, DecoratorSet decorators>
73 struct PostRuntimeDispatch<GCBarrierType, BARRIER_LOAD, decorators>: public AllStatic {
74 template <typename T>
75 static T access_barrier(void* addr) {
76 return GCBarrierType::load_in_heap(reinterpret_cast<T*>(addr));
77 }
78
79 static oop oop_access_barrier(void* addr) {
80 typedef typename HeapOopType<decorators>::type OopType;
81 if (HasDecorator<decorators, IN_HEAP>::value) {
82 return GCBarrierType::oop_load_in_heap(reinterpret_cast<OopType*>(addr));
83 } else {
84 return GCBarrierType::oop_load_not_in_heap(reinterpret_cast<OopType*>(addr));
85 }
86 }
87 };
88
89 template <class GCBarrierType, DecoratorSet decorators>
90 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_XCHG, decorators>: public AllStatic {
91 template <typename T>
92 static T access_barrier(T new_value, void* addr) {
93 return GCBarrierType::atomic_xchg_in_heap(new_value, reinterpret_cast<T*>(addr));
94 }
95
96 static oop oop_access_barrier(oop new_value, void* addr) {
97 typedef typename HeapOopType<decorators>::type OopType;
98 if (HasDecorator<decorators, IN_HEAP>::value) {
99 return GCBarrierType::oop_atomic_xchg_in_heap(new_value, reinterpret_cast<OopType*>(addr));
100 } else {
101 return GCBarrierType::oop_atomic_xchg_not_in_heap(new_value, reinterpret_cast<OopType*>(addr));
102 }
103 }
104 };
105
106 template <class GCBarrierType, DecoratorSet decorators>
107 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_CMPXCHG, decorators>: public AllStatic {
108 template <typename T>
109 static T access_barrier(T new_value, void* addr, T compare_value) {
110 return GCBarrierType::atomic_cmpxchg_in_heap(new_value, reinterpret_cast<T*>(addr), compare_value);
111 }
112
113 static oop oop_access_barrier(oop new_value, void* addr, oop compare_value) {
114 typedef typename HeapOopType<decorators>::type OopType;
115 if (HasDecorator<decorators, IN_HEAP>::value) {
116 return GCBarrierType::oop_atomic_cmpxchg_in_heap(new_value, reinterpret_cast<OopType*>(addr), compare_value);
117 } else {
118 return GCBarrierType::oop_atomic_cmpxchg_not_in_heap(new_value, reinterpret_cast<OopType*>(addr), compare_value);
119 }
120 }
121 };
122
123 template <class GCBarrierType, DecoratorSet decorators>
124 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ARRAYCOPY, decorators>: public AllStatic {
125 template <typename T>
126 static bool access_barrier(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
127 GCBarrierType::arraycopy_in_heap(src_obj, dst_obj, src, dst, length);
128 return true;
129 }
130
131 template <typename T>
132 static bool oop_access_barrier(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
133 typedef typename HeapOopType<decorators>::type OopType;
134 return GCBarrierType::oop_arraycopy_in_heap(src_obj, dst_obj,
135 reinterpret_cast<OopType*>(src),
136 reinterpret_cast<OopType*>(dst), length);
137 }
138 };
139
140 template <class GCBarrierType, DecoratorSet decorators>
141 struct PostRuntimeDispatch<GCBarrierType, BARRIER_STORE_AT, decorators>: public AllStatic {
142 template <typename T>
143 static void access_barrier(oop base, ptrdiff_t offset, T value) {
144 GCBarrierType::store_in_heap_at(base, offset, value);
145 }
146
147 static void oop_access_barrier(oop base, ptrdiff_t offset, oop value) {
148 GCBarrierType::oop_store_in_heap_at(base, offset, value);
149 }
150 };
151
152 template <class GCBarrierType, DecoratorSet decorators>
153 struct PostRuntimeDispatch<GCBarrierType, BARRIER_LOAD_AT, decorators>: public AllStatic {
154 template <typename T>
155 static T access_barrier(oop base, ptrdiff_t offset) {
156 return GCBarrierType::template load_in_heap_at<T>(base, offset);
157 }
158
159 static oop oop_access_barrier(oop base, ptrdiff_t offset) {
160 return GCBarrierType::oop_load_in_heap_at(base, offset);
161 }
162 };
163
164 template <class GCBarrierType, DecoratorSet decorators>
165 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_XCHG_AT, decorators>: public AllStatic {
166 template <typename T>
167 static T access_barrier(T new_value, oop base, ptrdiff_t offset) {
168 return GCBarrierType::atomic_xchg_in_heap_at(new_value, base, offset);
169 }
170
171 static oop oop_access_barrier(oop new_value, oop base, ptrdiff_t offset) {
172 return GCBarrierType::oop_atomic_xchg_in_heap_at(new_value, base, offset);
173 }
174 };
175
176 template <class GCBarrierType, DecoratorSet decorators>
177 struct PostRuntimeDispatch<GCBarrierType, BARRIER_ATOMIC_CMPXCHG_AT, decorators>: public AllStatic {
178 template <typename T>
179 static T access_barrier(T new_value, oop base, ptrdiff_t offset, T compare_value) {
180 return GCBarrierType::atomic_cmpxchg_in_heap_at(new_value, base, offset, compare_value);
181 }
182
183 static oop oop_access_barrier(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
184 return GCBarrierType::oop_atomic_cmpxchg_in_heap_at(new_value, base, offset, compare_value);
185 }
186 };
187
188 template <class GCBarrierType, DecoratorSet decorators>
189 struct PostRuntimeDispatch<GCBarrierType, BARRIER_CLONE, decorators>: public AllStatic {
190 static void access_barrier(oop src, oop dst, size_t size) {
191 GCBarrierType::clone_in_heap(src, dst, size);
192 }
193 };
194
195 template <class GCBarrierType, DecoratorSet decorators>
196 struct PostRuntimeDispatch<GCBarrierType, BARRIER_RESOLVE, decorators>: public AllStatic {
197 static oop access_barrier(oop obj) {
198 return GCBarrierType::resolve(obj);
199 }
200 };
201
202 template <class GCBarrierType, DecoratorSet decorators>
203 struct PostRuntimeDispatch<GCBarrierType, BARRIER_EQUALS, decorators>: public AllStatic {
204 static bool access_barrier(oop o1, oop o2) {
205 return GCBarrierType::equals(o1, o2);
206 }
207 };
208
209 // Resolving accessors with barriers from the barrier set happens in two steps.
210 // 1. Expand paths with runtime-decorators, e.g. is UseCompressedOops on or off.
211 // 2. Expand paths for each BarrierSet available in the system.
212 template <DecoratorSet decorators, typename FunctionPointerT, BarrierType barrier_type>
213 struct BarrierResolver: public AllStatic {
214 template <DecoratorSet ds>
215 static typename EnableIf<
216 HasDecorator<ds, INTERNAL_VALUE_IS_OOP>::value,
217 FunctionPointerT>::type
218 resolve_barrier_gc() {
219 BarrierSet* bs = BarrierSet::barrier_set();
220 assert(bs != NULL, "GC barriers invoked before BarrierSet is set");
221 switch (bs->kind()) {
222 #define BARRIER_SET_RESOLVE_BARRIER_CLOSURE(bs_name) \
223 case BarrierSet::bs_name: { \
224 return PostRuntimeDispatch<typename BarrierSet::GetType<BarrierSet::bs_name>::type:: \
225 AccessBarrier<ds>, barrier_type, ds>::oop_access_barrier; \
226 } \
227 break;
228 FOR_EACH_CONCRETE_BARRIER_SET_DO(BARRIER_SET_RESOLVE_BARRIER_CLOSURE)
229 #undef BARRIER_SET_RESOLVE_BARRIER_CLOSURE
230
231 default:
232 fatal("BarrierSet AccessBarrier resolving not implemented");
233 return NULL;
234 };
235 }
236
237 template <DecoratorSet ds>
238 static typename EnableIf<
239 !HasDecorator<ds, INTERNAL_VALUE_IS_OOP>::value,
240 FunctionPointerT>::type
241 resolve_barrier_gc() {
242 BarrierSet* bs = BarrierSet::barrier_set();
243 assert(bs != NULL, "GC barriers invoked before BarrierSet is set");
244 switch (bs->kind()) {
245 #define BARRIER_SET_RESOLVE_BARRIER_CLOSURE(bs_name) \
246 case BarrierSet::bs_name: { \
247 return PostRuntimeDispatch<typename BarrierSet::GetType<BarrierSet::bs_name>::type:: \
248 AccessBarrier<ds>, barrier_type, ds>::access_barrier; \
249 } \
250 break;
251 FOR_EACH_CONCRETE_BARRIER_SET_DO(BARRIER_SET_RESOLVE_BARRIER_CLOSURE)
252 #undef BARRIER_SET_RESOLVE_BARRIER_CLOSURE
253
254 default:
255 fatal("BarrierSet AccessBarrier resolving not implemented");
256 return NULL;
257 };
258 }
259
260 static FunctionPointerT resolve_barrier_rt() {
261 if (UseCompressedOops) {
262 const DecoratorSet expanded_decorators = decorators | INTERNAL_RT_USE_COMPRESSED_OOPS;
263 return resolve_barrier_gc<expanded_decorators>();
264 } else {
265 return resolve_barrier_gc<decorators>();
266 }
267 }
268
269 static FunctionPointerT resolve_barrier() {
270 return resolve_barrier_rt();
271 }
272 };
273
274 // Step 5.a: Barrier resolution
275 // The RuntimeDispatch class is responsible for performing a runtime dispatch of the
276 // accessor. This is required when the access either depends on whether compressed oops
277 // is being used, or it depends on which GC implementation was chosen (e.g. requires GC
278 // barriers). The way it works is that a function pointer initially pointing to an
279 // accessor resolution function gets called for each access. Upon first invocation,
280 // it resolves which accessor to be used in future invocations and patches the
281 // function pointer to this new accessor.
282
283 template <DecoratorSet decorators, typename T>
284 void RuntimeDispatch<decorators, T, BARRIER_STORE>::store_init(void* addr, T value) {
285 func_t function = BarrierResolver<decorators, func_t, BARRIER_STORE>::resolve_barrier();
286 _store_func = function;
287 function(addr, value);
288 }
289
290 template <DecoratorSet decorators, typename T>
291 void RuntimeDispatch<decorators, T, BARRIER_STORE_AT>::store_at_init(oop base, ptrdiff_t offset, T value) {
292 func_t function = BarrierResolver<decorators, func_t, BARRIER_STORE_AT>::resolve_barrier();
293 _store_at_func = function;
294 function(base, offset, value);
295 }
296
297 template <DecoratorSet decorators, typename T>
298 T RuntimeDispatch<decorators, T, BARRIER_LOAD>::load_init(void* addr) {
299 func_t function = BarrierResolver<decorators, func_t, BARRIER_LOAD>::resolve_barrier();
300 _load_func = function;
301 return function(addr);
302 }
303
304 template <DecoratorSet decorators, typename T>
305 T RuntimeDispatch<decorators, T, BARRIER_LOAD_AT>::load_at_init(oop base, ptrdiff_t offset) {
306 func_t function = BarrierResolver<decorators, func_t, BARRIER_LOAD_AT>::resolve_barrier();
307 _load_at_func = function;
308 return function(base, offset);
309 }
310
311 template <DecoratorSet decorators, typename T>
312 T RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG>::atomic_cmpxchg_init(T new_value, void* addr, T compare_value) {
313 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_CMPXCHG>::resolve_barrier();
314 _atomic_cmpxchg_func = function;
315 return function(new_value, addr, compare_value);
316 }
317
318 template <DecoratorSet decorators, typename T>
319 T RuntimeDispatch<decorators, T, BARRIER_ATOMIC_CMPXCHG_AT>::atomic_cmpxchg_at_init(T new_value, oop base, ptrdiff_t offset, T compare_value) {
320 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_CMPXCHG_AT>::resolve_barrier();
321 _atomic_cmpxchg_at_func = function;
322 return function(new_value, base, offset, compare_value);
323 }
324
325 template <DecoratorSet decorators, typename T>
326 T RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG>::atomic_xchg_init(T new_value, void* addr) {
327 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_XCHG>::resolve_barrier();
328 _atomic_xchg_func = function;
329 return function(new_value, addr);
330 }
331
332 template <DecoratorSet decorators, typename T>
333 T RuntimeDispatch<decorators, T, BARRIER_ATOMIC_XCHG_AT>::atomic_xchg_at_init(T new_value, oop base, ptrdiff_t offset) {
334 func_t function = BarrierResolver<decorators, func_t, BARRIER_ATOMIC_XCHG_AT>::resolve_barrier();
335 _atomic_xchg_at_func = function;
336 return function(new_value, base, offset);
337 }
338
339 template <DecoratorSet decorators, typename T>
340 bool RuntimeDispatch<decorators, T, BARRIER_ARRAYCOPY>::arraycopy_init(arrayOop src_obj, arrayOop dst_obj, T *src, T* dst, size_t length) {
341 func_t function = BarrierResolver<decorators, func_t, BARRIER_ARRAYCOPY>::resolve_barrier();
342 _arraycopy_func = function;
343 return function(src_obj, dst_obj, src, dst, length);
344 }
345
346 template <DecoratorSet decorators, typename T>
347 void RuntimeDispatch<decorators, T, BARRIER_CLONE>::clone_init(oop src, oop dst, size_t size) {
348 func_t function = BarrierResolver<decorators, func_t, BARRIER_CLONE>::resolve_barrier();
349 _clone_func = function;
350 function(src, dst, size);
351 }
352
353 template <DecoratorSet decorators, typename T>
354 oop RuntimeDispatch<decorators, T, BARRIER_RESOLVE>::resolve_init(oop obj) {
355 func_t function = BarrierResolver<decorators, func_t, BARRIER_RESOLVE>::resolve_barrier();
356 _resolve_func = function;
357 return function(obj);
358 }
359
360 template <DecoratorSet decorators, typename T>
361 bool RuntimeDispatch<decorators, T, BARRIER_EQUALS>::equals_init(oop o1, oop o2) {
362 func_t function = BarrierResolver<decorators, func_t, BARRIER_EQUALS>::resolve_barrier();
363 _equals_func = function;
364 return function(o1, o2);
365 }
366 }
367
368 #endif // SHARE_OOPS_ACCESS_INLINE_HPP