1 /* 2 * Copyright (c) 2015, 2022, Red Hat, Inc. All rights reserved. 3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_INLINE_HPP 27 #define SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_INLINE_HPP 28 29 #include "gc/shenandoah/shenandoahBarrierSet.hpp" 30 31 #include "gc/shared/accessBarrierSupport.inline.hpp" 32 #include "gc/shared/cardTable.hpp" 33 #include "gc/shenandoah/shenandoahAsserts.hpp" 34 #include "gc/shenandoah/shenandoahCollectionSet.inline.hpp" 35 #include "gc/shenandoah/shenandoahEvacOOMHandler.inline.hpp" 36 #include "gc/shenandoah/shenandoahForwarding.inline.hpp" 37 #include "gc/shenandoah/shenandoahGeneration.hpp" 38 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 39 #include "gc/shenandoah/shenandoahHeapRegion.hpp" 40 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp" 41 #include "gc/shenandoah/shenandoahThreadLocalData.hpp" 42 #include "gc/shenandoah/mode/shenandoahMode.hpp" 43 #include "memory/iterator.inline.hpp" 44 #include "oops/oop.inline.hpp" 45 46 inline oop ShenandoahBarrierSet::resolve_forwarded_not_null(oop p) { 47 return ShenandoahForwarding::get_forwardee(p); 48 } 49 50 inline oop ShenandoahBarrierSet::resolve_forwarded(oop p) { 51 if (p != nullptr) { 52 return resolve_forwarded_not_null(p); 53 } else { 54 return p; 55 } 56 } 57 58 inline oop ShenandoahBarrierSet::resolve_forwarded_not_null_mutator(oop p) { 59 return ShenandoahForwarding::get_forwardee_mutator(p); 60 } 61 62 template <class T> 63 inline oop ShenandoahBarrierSet::load_reference_barrier_mutator(oop obj, T* load_addr) { 64 assert(ShenandoahLoadRefBarrier, "should be enabled"); 65 shenandoah_assert_in_cset(load_addr, obj); 66 67 oop fwd = resolve_forwarded_not_null_mutator(obj); 68 if (obj == fwd) { 69 assert(_heap->is_evacuation_in_progress(), 70 "evac should be in progress"); 71 Thread* const t = Thread::current(); 72 ShenandoahEvacOOMScope scope(t); 73 fwd = _heap->evacuate_object(obj, t); 74 } 75 76 if (load_addr != nullptr && fwd != obj) { 77 // Since we are here and we know the load address, update the reference. 78 ShenandoahHeap::atomic_update_oop(fwd, load_addr, obj); 79 } 80 81 return fwd; 82 } 83 84 inline oop ShenandoahBarrierSet::load_reference_barrier(oop obj) { 85 if (!ShenandoahLoadRefBarrier) { 86 return obj; 87 } 88 if (_heap->has_forwarded_objects() && 89 _heap->in_collection_set(obj)) { // Subsumes null-check 90 assert(obj != nullptr, "cset check must have subsumed null-check"); 91 oop fwd = resolve_forwarded_not_null(obj); 92 if (obj == fwd && _heap->is_evacuation_in_progress()) { 93 Thread* t = Thread::current(); 94 ShenandoahEvacOOMScope oom_evac_scope(t); 95 return _heap->evacuate_object(obj, t); 96 } 97 return fwd; 98 } 99 return obj; 100 } 101 102 template <class T> 103 inline oop ShenandoahBarrierSet::load_reference_barrier(DecoratorSet decorators, oop obj, T* load_addr) { 104 if (obj == nullptr) { 105 return nullptr; 106 } 107 108 // Prevent resurrection of unreachable phantom (i.e. weak-native) references. 109 if ((decorators & ON_PHANTOM_OOP_REF) != 0 && 110 _heap->is_concurrent_weak_root_in_progress() && 111 _heap->is_in_active_generation(obj) && 112 !_heap->marking_context()->is_marked(obj)) { 113 return nullptr; 114 } 115 116 // Prevent resurrection of unreachable weak references. 117 if ((decorators & ON_WEAK_OOP_REF) != 0 && 118 _heap->is_concurrent_weak_root_in_progress() && 119 _heap->is_in_active_generation(obj) && 120 !_heap->marking_context()->is_marked_strong(obj)) { 121 return nullptr; 122 } 123 124 // Prevent resurrection of unreachable objects that are visited during 125 // concurrent class-unloading. 126 if ((decorators & AS_NO_KEEPALIVE) != 0 && 127 _heap->is_evacuation_in_progress() && 128 !_heap->marking_context()->is_marked(obj)) { 129 return obj; 130 } 131 132 oop fwd = load_reference_barrier(obj); 133 if (load_addr != nullptr && fwd != obj) { 134 // Since we are here and we know the load address, update the reference. 135 ShenandoahHeap::atomic_update_oop(fwd, load_addr, obj); 136 } 137 138 return fwd; 139 } 140 141 inline void ShenandoahBarrierSet::enqueue(oop obj) { 142 assert(obj != nullptr, "checked by caller"); 143 assert(_satb_mark_queue_set.is_active(), "only get here when SATB active"); 144 145 // Filter marked objects before hitting the SATB queues. The same predicate would 146 // be used by SATBMQ::filter to eliminate already marked objects downstream, but 147 // filtering here helps to avoid wasteful SATB queueing work to begin with. 148 if (!_heap->requires_marking(obj)) return; 149 150 SATBMarkQueue& queue = ShenandoahThreadLocalData::satb_mark_queue(Thread::current()); 151 _satb_mark_queue_set.enqueue_known_active(queue, obj); 152 } 153 154 template <DecoratorSet decorators, typename T> 155 inline void ShenandoahBarrierSet::satb_barrier(T *field) { 156 if (HasDecorator<decorators, IS_DEST_UNINITIALIZED>::value || 157 HasDecorator<decorators, AS_NO_KEEPALIVE>::value) { 158 return; 159 } 160 if (ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) { 161 T heap_oop = RawAccess<>::oop_load(field); 162 if (!CompressedOops::is_null(heap_oop)) { 163 enqueue(CompressedOops::decode(heap_oop)); 164 } 165 } 166 } 167 168 inline void ShenandoahBarrierSet::satb_enqueue(oop value) { 169 if (value != nullptr && ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) { 170 enqueue(value); 171 } 172 } 173 174 inline void ShenandoahBarrierSet::iu_barrier(oop obj) { 175 if (ShenandoahIUBarrier && obj != nullptr && _heap->is_concurrent_mark_in_progress()) { 176 enqueue(obj); 177 } 178 } 179 180 inline void ShenandoahBarrierSet::keep_alive_if_weak(DecoratorSet decorators, oop value) { 181 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known"); 182 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0; 183 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0; 184 if (!peek && !on_strong_oop_ref) { 185 satb_enqueue(value); 186 } 187 } 188 189 template <DecoratorSet decorators, typename T> 190 inline void ShenandoahBarrierSet::write_ref_field_post(T* field) { 191 assert(ShenandoahCardBarrier, "Did you mean to enable ShenandoahCardBarrier?"); 192 volatile CardTable::CardValue* byte = card_table()->byte_for(field); 193 *byte = CardTable::dirty_card_val(); 194 } 195 196 template <typename T> 197 inline oop ShenandoahBarrierSet::oop_load(DecoratorSet decorators, T* addr) { 198 oop value = RawAccess<>::oop_load(addr); 199 value = load_reference_barrier(decorators, value, addr); 200 keep_alive_if_weak(decorators, value); 201 return value; 202 } 203 204 template <typename T> 205 inline oop ShenandoahBarrierSet::oop_cmpxchg(DecoratorSet decorators, T* addr, oop compare_value, oop new_value) { 206 iu_barrier(new_value); 207 oop res; 208 oop expected = compare_value; 209 do { 210 compare_value = expected; 211 res = RawAccess<>::oop_atomic_cmpxchg(addr, compare_value, new_value); 212 expected = res; 213 } while ((compare_value != expected) && (resolve_forwarded(compare_value) == resolve_forwarded(expected))); 214 215 // Note: We don't need a keep-alive-barrier here. We already enqueue any loaded reference for SATB anyway, 216 // because it must be the previous value. 217 res = load_reference_barrier(decorators, res, static_cast<T*>(nullptr)); 218 satb_enqueue(res); 219 return res; 220 } 221 222 template <typename T> 223 inline oop ShenandoahBarrierSet::oop_xchg(DecoratorSet decorators, T* addr, oop new_value) { 224 iu_barrier(new_value); 225 oop previous = RawAccess<>::oop_atomic_xchg(addr, new_value); 226 // Note: We don't need a keep-alive-barrier here. We already enqueue any loaded reference for SATB anyway, 227 // because it must be the previous value. 228 previous = load_reference_barrier<T>(decorators, previous, static_cast<T*>(nullptr)); 229 satb_enqueue(previous); 230 return previous; 231 } 232 233 template <DecoratorSet decorators, typename BarrierSetT> 234 template <typename T> 235 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_load_not_in_heap(T* addr) { 236 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "must be absent"); 237 ShenandoahBarrierSet* const bs = ShenandoahBarrierSet::barrier_set(); 238 return bs->oop_load(decorators, addr); 239 } 240 241 template <DecoratorSet decorators, typename BarrierSetT> 242 template <typename T> 243 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_load_in_heap(T* addr) { 244 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "must be absent"); 245 ShenandoahBarrierSet* const bs = ShenandoahBarrierSet::barrier_set(); 246 return bs->oop_load(decorators, addr); 247 } 248 249 template <DecoratorSet decorators, typename BarrierSetT> 250 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_load_in_heap_at(oop base, ptrdiff_t offset) { 251 ShenandoahBarrierSet* const bs = ShenandoahBarrierSet::barrier_set(); 252 DecoratorSet resolved_decorators = AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset); 253 return bs->oop_load(resolved_decorators, AccessInternal::oop_field_addr<decorators>(base, offset)); 254 } 255 256 template <DecoratorSet decorators, typename BarrierSetT> 257 template <typename T> 258 inline void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_store_common(T* addr, oop value) { 259 shenandoah_assert_marked_if(nullptr, value, 260 !CompressedOops::is_null(value) && 261 ShenandoahHeap::heap()->is_evacuation_in_progress() && 262 !(ShenandoahHeap::heap()->active_generation()->is_young() && 263 ShenandoahHeap::heap()->heap_region_containing(value)->is_old())); 264 shenandoah_assert_not_in_cset_if(addr, value, value != nullptr && !ShenandoahHeap::heap()->cancelled_gc()); 265 ShenandoahBarrierSet* const bs = ShenandoahBarrierSet::barrier_set(); 266 bs->iu_barrier(value); 267 bs->satb_barrier<decorators>(addr); 268 Raw::oop_store(addr, value); 269 } 270 271 template <DecoratorSet decorators, typename BarrierSetT> 272 template <typename T> 273 inline void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_store_not_in_heap(T* addr, oop value) { 274 oop_store_common(addr, value); 275 } 276 277 template <DecoratorSet decorators, typename BarrierSetT> 278 template <typename T> 279 inline void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_store_in_heap(T* addr, oop value) { 280 shenandoah_assert_not_in_cset_loc_except(addr, ShenandoahHeap::heap()->cancelled_gc()); 281 shenandoah_assert_not_forwarded_except (addr, value, value == nullptr || ShenandoahHeap::heap()->cancelled_gc() || !ShenandoahHeap::heap()->is_concurrent_mark_in_progress()); 282 283 oop_store_common(addr, value); 284 if (ShenandoahCardBarrier) { 285 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 286 bs->write_ref_field_post<decorators>(addr); 287 } 288 } 289 290 template <DecoratorSet decorators, typename BarrierSetT> 291 inline void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) { 292 oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value); 293 } 294 295 template <DecoratorSet decorators, typename BarrierSetT> 296 template <typename T> 297 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_cmpxchg_not_in_heap(T* addr, oop compare_value, oop new_value) { 298 assert((decorators & (AS_NO_KEEPALIVE | ON_UNKNOWN_OOP_REF)) == 0, "must be absent"); 299 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 300 return bs->oop_cmpxchg(decorators, addr, compare_value, new_value); 301 } 302 303 template <DecoratorSet decorators, typename BarrierSetT> 304 template <typename T> 305 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_cmpxchg_in_heap(T* addr, oop compare_value, oop new_value) { 306 assert((decorators & (AS_NO_KEEPALIVE | ON_UNKNOWN_OOP_REF)) == 0, "must be absent"); 307 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 308 oop result = bs->oop_cmpxchg(decorators, addr, compare_value, new_value); 309 if (ShenandoahCardBarrier) { 310 bs->write_ref_field_post<decorators>(addr); 311 } 312 return result; 313 } 314 315 template <DecoratorSet decorators, typename BarrierSetT> 316 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_cmpxchg_in_heap_at(oop base, ptrdiff_t offset, oop compare_value, oop new_value) { 317 assert((decorators & AS_NO_KEEPALIVE) == 0, "must be absent"); 318 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 319 DecoratorSet resolved_decorators = AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset); 320 auto addr = AccessInternal::oop_field_addr<decorators>(base, offset); 321 oop result = bs->oop_cmpxchg(resolved_decorators, addr, compare_value, new_value); 322 if (ShenandoahCardBarrier) { 323 bs->write_ref_field_post<decorators>(addr); 324 } 325 return result; 326 } 327 328 template <DecoratorSet decorators, typename BarrierSetT> 329 template <typename T> 330 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_xchg_not_in_heap(T* addr, oop new_value) { 331 assert((decorators & (AS_NO_KEEPALIVE | ON_UNKNOWN_OOP_REF)) == 0, "must be absent"); 332 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 333 return bs->oop_xchg(decorators, addr, new_value); 334 } 335 336 template <DecoratorSet decorators, typename BarrierSetT> 337 template <typename T> 338 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_xchg_in_heap(T* addr, oop new_value) { 339 assert((decorators & (AS_NO_KEEPALIVE | ON_UNKNOWN_OOP_REF)) == 0, "must be absent"); 340 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 341 oop result = bs->oop_xchg(decorators, addr, new_value); 342 if (ShenandoahCardBarrier) { 343 bs->write_ref_field_post<decorators>(addr); 344 } 345 return result; 346 } 347 348 template <DecoratorSet decorators, typename BarrierSetT> 349 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value) { 350 assert((decorators & AS_NO_KEEPALIVE) == 0, "must be absent"); 351 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 352 DecoratorSet resolved_decorators = AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset); 353 auto addr = AccessInternal::oop_field_addr<decorators>(base, offset); 354 oop result = bs->oop_xchg(resolved_decorators, addr, new_value); 355 if (ShenandoahCardBarrier) { 356 bs->write_ref_field_post<decorators>(addr); 357 } 358 return result; 359 } 360 361 // Clone barrier support 362 template <DecoratorSet decorators, typename BarrierSetT> 363 void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::clone_in_heap(oop src, oop dst, size_t size) { 364 if (ShenandoahCloneBarrier) { 365 ShenandoahBarrierSet::barrier_set()->clone_barrier_runtime(src); 366 } 367 Raw::clone(src, dst, size); 368 } 369 370 template <DecoratorSet decorators, typename BarrierSetT> 371 template <typename T> 372 bool ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw, 373 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw, 374 size_t length) { 375 T* src = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw); 376 T* dst = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw); 377 378 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set(); 379 bs->arraycopy_barrier(src, dst, length); 380 bool result = Raw::oop_arraycopy_in_heap(src_obj, src_offset_in_bytes, src_raw, dst_obj, dst_offset_in_bytes, dst_raw, length); 381 if (ShenandoahCardBarrier) { 382 bs->write_ref_array((HeapWord*) dst, length); 383 } 384 return result; 385 } 386 387 template <class T, bool HAS_FWD, bool EVAC, bool ENQUEUE> 388 void ShenandoahBarrierSet::arraycopy_work(T* src, size_t count) { 389 // We allow forwarding in young generation and marking in old generation 390 // to happen simultaneously. 391 assert(_heap->mode()->is_generational() || HAS_FWD == _heap->has_forwarded_objects(), "Forwarded object status is sane"); 392 393 Thread* thread = Thread::current(); 394 SATBMarkQueue& queue = ShenandoahThreadLocalData::satb_mark_queue(thread); 395 ShenandoahMarkingContext* ctx = _heap->marking_context(); 396 const ShenandoahCollectionSet* const cset = _heap->collection_set(); 397 T* end = src + count; 398 for (T* elem_ptr = src; elem_ptr < end; elem_ptr++) { 399 T o = RawAccess<>::oop_load(elem_ptr); 400 if (!CompressedOops::is_null(o)) { 401 oop obj = CompressedOops::decode_not_null(o); 402 if (HAS_FWD && cset->is_in(obj)) { 403 oop fwd = resolve_forwarded_not_null(obj); 404 if (EVAC && obj == fwd) { 405 fwd = _heap->evacuate_object(obj, thread); 406 } 407 shenandoah_assert_forwarded_except(elem_ptr, obj, _heap->cancelled_gc()); 408 ShenandoahHeap::atomic_update_oop(fwd, elem_ptr, o); 409 obj = fwd; 410 } 411 if (ENQUEUE && !ctx->is_marked_strong_or_old(obj)) { 412 _satb_mark_queue_set.enqueue_known_active(queue, obj); 413 } 414 } 415 } 416 } 417 418 template <class T> 419 void ShenandoahBarrierSet::arraycopy_barrier(T* src, T* dst, size_t count) { 420 if (count == 0) { 421 return; 422 } 423 int gc_state = _heap->gc_state(); 424 if ((gc_state & ShenandoahHeap::YOUNG_MARKING) != 0) { 425 arraycopy_marking(src, dst, count, false); 426 return; 427 } 428 429 if ((gc_state & ShenandoahHeap::EVACUATION) != 0) { 430 arraycopy_evacuation(src, count); 431 } else if ((gc_state & ShenandoahHeap::UPDATEREFS) != 0) { 432 arraycopy_update(src, count); 433 } 434 435 if (_heap->mode()->is_generational()) { 436 assert(ShenandoahSATBBarrier, "Generational mode assumes SATB mode"); 437 // TODO: Could we optimize here by checking that dst is in an old region? 438 if ((gc_state & ShenandoahHeap::OLD_MARKING) != 0) { 439 // Note that we can't do the arraycopy marking using the 'src' array when 440 // SATB mode is enabled (so we can't do this as part of the iteration for 441 // evacuation or update references). 442 arraycopy_marking(src, dst, count, true); 443 } 444 } 445 } 446 447 template <class T> 448 void ShenandoahBarrierSet::arraycopy_marking(T* src, T* dst, size_t count, bool is_old_marking) { 449 assert(_heap->is_concurrent_mark_in_progress(), "only during marking"); 450 /* 451 * Note that an old-gen object is considered live if it is live at the start of OLD marking or if it is promoted 452 * following the start of OLD marking. 453 * 454 * 1. Every object promoted following the start of OLD marking will be above TAMS within its old-gen region 455 * 2. Every object live at the start of OLD marking will be referenced from a "root" or it will be referenced from 456 * another live OLD-gen object. With regards to old-gen, roots include stack locations and all of live young-gen. 457 * All root references to old-gen are identified during a bootstrap young collection. All references from other 458 * old-gen objects will be marked during the traversal of all old objects, or will be marked by the SATB barrier. 459 * 460 * During old-gen marking (which is interleaved with young-gen collections), call arraycopy_work() if: 461 * 462 * 1. The overwritten array resides in old-gen and it is below TAMS within its old-gen region 463 * 2. Do not call arraycopy_work for any array residing in young-gen because young-gen collection is idle at this time 464 * 465 * During young-gen marking, call arraycopy_work() if: 466 * 467 * 1. The overwritten array resides in young-gen and is below TAMS within its young-gen region 468 * 2. Additionally, if array resides in old-gen, regardless of its relationship to TAMS because this old-gen array 469 * may hold references to young-gen 470 */ 471 if (ShenandoahSATBBarrier) { 472 T* array = dst; 473 HeapWord* array_addr = reinterpret_cast<HeapWord*>(array); 474 ShenandoahHeapRegion* r = _heap->heap_region_containing(array_addr); 475 if (is_old_marking) { 476 // Generational, old marking 477 assert(_heap->mode()->is_generational(), "Invariant"); 478 if (r->is_old() && (array_addr < _heap->marking_context()->top_at_mark_start(r))) { 479 arraycopy_work<T, false, false, true>(array, count); 480 } 481 } else if (_heap->mode()->is_generational()) { 482 // Generational, young marking 483 if (r->is_old() || (array_addr < _heap->marking_context()->top_at_mark_start(r))) { 484 arraycopy_work<T, false, false, true>(array, count); 485 } 486 } else if (array_addr < _heap->marking_context()->top_at_mark_start(r)) { 487 // Non-generational, marking 488 arraycopy_work<T, false, false, true>(array, count); 489 } 490 } else { 491 // Incremental Update mode, marking 492 T* array = src; 493 HeapWord* array_addr = reinterpret_cast<HeapWord*>(array); 494 ShenandoahHeapRegion* r = _heap->heap_region_containing(array_addr); 495 if (array_addr < _heap->marking_context()->top_at_mark_start(r)) { 496 arraycopy_work<T, false, false, true>(array, count); 497 } 498 } 499 } 500 501 inline bool ShenandoahBarrierSet::need_bulk_update(HeapWord* ary) { 502 return ary < _heap->heap_region_containing(ary)->get_update_watermark(); 503 } 504 505 template <class T> 506 void ShenandoahBarrierSet::arraycopy_evacuation(T* src, size_t count) { 507 assert(_heap->is_evacuation_in_progress(), "only during evacuation"); 508 if (need_bulk_update(reinterpret_cast<HeapWord*>(src))) { 509 ShenandoahEvacOOMScope oom_evac; 510 arraycopy_work<T, true, true, false>(src, count); 511 } 512 } 513 514 template <class T> 515 void ShenandoahBarrierSet::arraycopy_update(T* src, size_t count) { 516 assert(_heap->is_update_refs_in_progress(), "only during update-refs"); 517 if (need_bulk_update(reinterpret_cast<HeapWord*>(src))) { 518 arraycopy_work<T, true, false, false>(src, count); 519 } 520 } 521 522 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_INLINE_HPP