182 }
183 }
184
185 template <typename T, bool CHECKCAST>
186 bool ShenandoahBarrierSet::arraycopy_loop_2(T* src, T* dst, size_t length, Klass* bound,
187 bool satb, bool disjoint,
188 ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode) {
189 if (satb) {
190 return arraycopy_loop_3<T, CHECKCAST, true>(src, dst, length, bound, disjoint, storeval_mode);
191 } else {
192 return arraycopy_loop_3<T, CHECKCAST, false>(src, dst, length, bound, disjoint, storeval_mode);
193 }
194 }
195
196 template <typename T, bool CHECKCAST, bool SATB>
197 bool ShenandoahBarrierSet::arraycopy_loop_3(T* src, T* dst, size_t length, Klass* bound, bool disjoint,
198 ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode) {
199 switch (storeval_mode) {
200 case NONE:
201 return arraycopy_loop<T, CHECKCAST, SATB, NONE>(src, dst, length, bound, disjoint);
202 case READ_BARRIER:
203 return arraycopy_loop<T, CHECKCAST, SATB, READ_BARRIER>(src, dst, length, bound, disjoint);
204 case WRITE_BARRIER:
205 return arraycopy_loop<T, CHECKCAST, SATB, WRITE_BARRIER>(src, dst, length, bound, disjoint);
206 default:
207 ShouldNotReachHere();
208 return true; // happy compiler
209 }
210 }
211
212 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
213 bool ShenandoahBarrierSet::arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint) {
214 Thread* thread = Thread::current();
215 ShenandoahMarkingContext* ctx = _heap->marking_context();
216 ShenandoahEvacOOMScope oom_evac_scope;
217
218 // We need to handle four cases:
219 //
220 // a) src < dst, conjoint, can only copy backward only
221 // [...src...]
222 // [...dst...]
223 //
224 // b) src < dst, disjoint, can only copy forward, because types may mismatch
225 // [...src...]
251 if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread, ctx)) {
252 return false;
253 }
254 }
255 }
256 return true;
257 }
258
259 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
260 bool ShenandoahBarrierSet::arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* const thread, ShenandoahMarkingContext* const ctx) {
261 T o = RawAccess<>::oop_load(cur_src);
262
263 if (SATB) {
264 assert(ShenandoahThreadLocalData::satb_mark_queue(thread).is_active(), "Shouldn't be here otherwise");
265 T prev = RawAccess<>::oop_load(cur_dst);
266 if (!CompressedOops::is_null(prev)) {
267 oop prev_obj = CompressedOops::decode_not_null(prev);
268 switch (STOREVAL_MODE) {
269 case NONE:
270 break;
271 case READ_BARRIER:
272 case WRITE_BARRIER:
273 // The write-barrier case cannot really happen. It's traversal-only and traversal
274 // doesn't currently use SATB. And even if it did, it would not be fatal to just do the normal RB here.
275 prev_obj = ShenandoahBarrierSet::resolve_forwarded_not_null(prev_obj);
276 }
277 if (!ctx->is_marked(prev_obj)) {
278 ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue_known_active(prev_obj);
279 }
280 }
281 }
282
283 if (!CompressedOops::is_null(o)) {
284 oop obj = CompressedOops::decode_not_null(o);
285
286 if (CHECKCAST) {
287 assert(bound != NULL, "need element klass for checkcast");
288 if (!oopDesc::is_instanceof_or_null(obj, bound)) {
289 return false;
290 }
291 }
292
293 switch (STOREVAL_MODE) {
294 case NONE:
295 break;
296 case READ_BARRIER:
297 obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
298 break;
299 case WRITE_BARRIER:
300 if (_heap->in_collection_set(obj)) {
301 oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
302 if (oopDesc::equals_raw(forw, obj)) {
303 forw = _heap->evacuate_object(forw, thread);
304 }
305 obj = forw;
306 }
307 enqueue(obj);
308 break;
309 default:
310 ShouldNotReachHere();
311 }
312
313 RawAccess<IS_NOT_NULL>::oop_store(cur_dst, obj);
314 } else {
315 // Store null.
316 RawAccess<>::oop_store(cur_dst, o);
317 }
318 return true;
319 }
320
321 // Clone barrier support
322 template <DecoratorSet decorators, typename BarrierSetT>
323 void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::clone_in_heap(oop src, oop dst, size_t size) {
324 Raw::clone(src, dst, size);
325 ShenandoahBarrierSet::barrier_set()->write_region(MemRegion((HeapWord*) dst, size));
326 }
327
328 template <DecoratorSet decorators, typename BarrierSetT>
329 template <typename T>
330 bool ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
331 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
332 size_t length) {
333 ShenandoahHeap* heap = ShenandoahHeap::heap();
334 bool satb = ShenandoahSATBBarrier && heap->is_concurrent_mark_in_progress();
335 bool checkcast = HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value;
336 bool disjoint = HasDecorator<decorators, ARRAYCOPY_DISJOINT>::value;
337 ArrayCopyStoreValMode storeval_mode;
338 if (heap->has_forwarded_objects()) {
339 if (heap->is_concurrent_traversal_in_progress()) {
340 storeval_mode = WRITE_BARRIER;
341 } else if (heap->is_update_refs_in_progress()) {
342 storeval_mode = READ_BARRIER;
343 } else {
344 assert(heap->is_idle() || heap->is_evacuation_in_progress(), "must not have anything in progress");
345 storeval_mode = NONE; // E.g. during evac or outside cycle
346 }
347 } else {
348 assert(heap->is_stable() || heap->is_concurrent_mark_in_progress(), "must not have anything in progress");
349 storeval_mode = NONE;
350 }
351
352 if (!satb && !checkcast && storeval_mode == NONE) {
353 // Short-circuit to bulk copy.
354 return Raw::oop_arraycopy(src_obj, src_offset_in_bytes, src_raw, dst_obj, dst_offset_in_bytes, dst_raw, length);
355 }
356
357 src_raw = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw);
358 dst_raw = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw);
359
360 Klass* bound = objArrayOop(dst_obj)->element_klass();
361 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set();
362 return bs->arraycopy_loop_1(src_raw, dst_raw, length, bound, checkcast, satb, disjoint, storeval_mode);
|
182 }
183 }
184
185 template <typename T, bool CHECKCAST>
186 bool ShenandoahBarrierSet::arraycopy_loop_2(T* src, T* dst, size_t length, Klass* bound,
187 bool satb, bool disjoint,
188 ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode) {
189 if (satb) {
190 return arraycopy_loop_3<T, CHECKCAST, true>(src, dst, length, bound, disjoint, storeval_mode);
191 } else {
192 return arraycopy_loop_3<T, CHECKCAST, false>(src, dst, length, bound, disjoint, storeval_mode);
193 }
194 }
195
196 template <typename T, bool CHECKCAST, bool SATB>
197 bool ShenandoahBarrierSet::arraycopy_loop_3(T* src, T* dst, size_t length, Klass* bound, bool disjoint,
198 ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode) {
199 switch (storeval_mode) {
200 case NONE:
201 return arraycopy_loop<T, CHECKCAST, SATB, NONE>(src, dst, length, bound, disjoint);
202 case RESOLVE_BARRIER:
203 return arraycopy_loop<T, CHECKCAST, SATB, RESOLVE_BARRIER>(src, dst, length, bound, disjoint);
204 case EVAC_BARRIER:
205 return arraycopy_loop<T, CHECKCAST, SATB, EVAC_BARRIER>(src, dst, length, bound, disjoint);
206 default:
207 ShouldNotReachHere();
208 return true; // happy compiler
209 }
210 }
211
212 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
213 bool ShenandoahBarrierSet::arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint) {
214 Thread* thread = Thread::current();
215 ShenandoahMarkingContext* ctx = _heap->marking_context();
216 ShenandoahEvacOOMScope oom_evac_scope;
217
218 // We need to handle four cases:
219 //
220 // a) src < dst, conjoint, can only copy backward only
221 // [...src...]
222 // [...dst...]
223 //
224 // b) src < dst, disjoint, can only copy forward, because types may mismatch
225 // [...src...]
251 if (!arraycopy_element<T, CHECKCAST, SATB, STOREVAL_MODE>(cur_src, cur_dst, bound, thread, ctx)) {
252 return false;
253 }
254 }
255 }
256 return true;
257 }
258
259 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
260 bool ShenandoahBarrierSet::arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* const thread, ShenandoahMarkingContext* const ctx) {
261 T o = RawAccess<>::oop_load(cur_src);
262
263 if (SATB) {
264 assert(ShenandoahThreadLocalData::satb_mark_queue(thread).is_active(), "Shouldn't be here otherwise");
265 T prev = RawAccess<>::oop_load(cur_dst);
266 if (!CompressedOops::is_null(prev)) {
267 oop prev_obj = CompressedOops::decode_not_null(prev);
268 switch (STOREVAL_MODE) {
269 case NONE:
270 break;
271 case RESOLVE_BARRIER:
272 case EVAC_BARRIER:
273 // The evac-barrier case cannot really happen. It's traversal-only and traversal
274 // doesn't currently use SATB. And even if it did, it would not be fatal to just do the normal resolve here.
275 prev_obj = ShenandoahBarrierSet::resolve_forwarded_not_null(prev_obj);
276 }
277 if (!ctx->is_marked(prev_obj)) {
278 ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue_known_active(prev_obj);
279 }
280 }
281 }
282
283 if (!CompressedOops::is_null(o)) {
284 oop obj = CompressedOops::decode_not_null(o);
285
286 if (CHECKCAST) {
287 assert(bound != NULL, "need element klass for checkcast");
288 if (!oopDesc::is_instanceof_or_null(obj, bound)) {
289 return false;
290 }
291 }
292
293 switch (STOREVAL_MODE) {
294 case NONE:
295 break;
296 case RESOLVE_BARRIER:
297 obj = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
298 break;
299 case EVAC_BARRIER:
300 if (_heap->in_collection_set(obj)) {
301 oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
302 if (oopDesc::equals_raw(forw, obj)) {
303 forw = _heap->evacuate_object(forw, thread);
304 }
305 obj = forw;
306 }
307 enqueue(obj);
308 break;
309 default:
310 ShouldNotReachHere();
311 }
312
313 RawAccess<IS_NOT_NULL>::oop_store(cur_dst, obj);
314 } else {
315 // Store null.
316 RawAccess<>::oop_store(cur_dst, o);
317 }
318 return true;
319 }
320
321 // Clone barrier support
322 template <DecoratorSet decorators, typename BarrierSetT>
323 void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::clone_in_heap(oop src, oop dst, size_t size) {
324 Raw::clone(src, dst, size);
325 ShenandoahBarrierSet::barrier_set()->write_region(MemRegion((HeapWord*) dst, size));
326 }
327
328 template <DecoratorSet decorators, typename BarrierSetT>
329 template <typename T>
330 bool ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
331 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
332 size_t length) {
333 ShenandoahHeap* heap = ShenandoahHeap::heap();
334 bool satb = ShenandoahSATBBarrier && heap->is_concurrent_mark_in_progress();
335 bool checkcast = HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value;
336 bool disjoint = HasDecorator<decorators, ARRAYCOPY_DISJOINT>::value;
337 ArrayCopyStoreValMode storeval_mode;
338 if (heap->has_forwarded_objects()) {
339 if (heap->is_concurrent_traversal_in_progress()) {
340 storeval_mode = EVAC_BARRIER;
341 } else if (heap->is_update_refs_in_progress()) {
342 storeval_mode = RESOLVE_BARRIER;
343 } else {
344 assert(heap->is_idle() || heap->is_evacuation_in_progress(), "must not have anything in progress");
345 storeval_mode = NONE; // E.g. during evac or outside cycle
346 }
347 } else {
348 assert(heap->is_stable() || heap->is_concurrent_mark_in_progress(), "must not have anything in progress");
349 storeval_mode = NONE;
350 }
351
352 if (!satb && !checkcast && storeval_mode == NONE) {
353 // Short-circuit to bulk copy.
354 return Raw::oop_arraycopy(src_obj, src_offset_in_bytes, src_raw, dst_obj, dst_offset_in_bytes, dst_raw, length);
355 }
356
357 src_raw = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw);
358 dst_raw = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw);
359
360 Klass* bound = objArrayOop(dst_obj)->element_klass();
361 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set();
362 return bs->arraycopy_loop_1(src_raw, dst_raw, length, bound, checkcast, satb, disjoint, storeval_mode);
|