355 if (ShenandoahCardBarrier) {
356 bs->write_ref_field_post<decorators>(addr);
357 }
358 return result;
359 }
360
361 template <DecoratorSet decorators, typename BarrierSetT>
362 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value) {
363 assert((decorators & AS_NO_KEEPALIVE) == 0, "must be absent");
364 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set();
365 DecoratorSet resolved_decorators = AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset);
366 auto addr = AccessInternal::oop_field_addr<decorators>(base, offset);
367 oop result = bs->oop_xchg(resolved_decorators, addr, new_value);
368 if (ShenandoahCardBarrier) {
369 bs->write_ref_field_post<decorators>(addr);
370 }
371 return result;
372 }
373
374 // Clone barrier support
375 template <DecoratorSet decorators, typename BarrierSetT>
376 void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::clone_in_heap(oop src, oop dst, size_t size) {
377 if (ShenandoahCloneBarrier) {
378 ShenandoahBarrierSet::barrier_set()->clone_barrier_runtime(src);
379 }
380 Raw::clone(src, dst, size);
381 }
382
383 template <DecoratorSet decorators, typename BarrierSetT>
384 template <typename T>
385 OopCopyResult ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
386 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
387 size_t length) {
388 T* src = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw);
389 T* dst = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw);
390
391 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set();
392 bs->arraycopy_barrier(src, dst, length);
393 OopCopyResult result = Raw::oop_arraycopy_in_heap(src_obj, src_offset_in_bytes, src_raw, dst_obj, dst_offset_in_bytes, dst_raw, length);
394 if (ShenandoahCardBarrier) {
395 bs->write_ref_array((HeapWord*) dst, length);
396 }
397 return result;
398 }
399
400 template <class T, bool HAS_FWD, bool EVAC, bool ENQUEUE>
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355 if (ShenandoahCardBarrier) {
356 bs->write_ref_field_post<decorators>(addr);
357 }
358 return result;
359 }
360
361 template <DecoratorSet decorators, typename BarrierSetT>
362 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value) {
363 assert((decorators & AS_NO_KEEPALIVE) == 0, "must be absent");
364 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set();
365 DecoratorSet resolved_decorators = AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset);
366 auto addr = AccessInternal::oop_field_addr<decorators>(base, offset);
367 oop result = bs->oop_xchg(resolved_decorators, addr, new_value);
368 if (ShenandoahCardBarrier) {
369 bs->write_ref_field_post<decorators>(addr);
370 }
371 return result;
372 }
373
374 // Clone barrier support
375 template <bool EVAC>
376 class ShenandoahUpdateEvacForCloneOopClosure : public BasicOopIterateClosure {
377 private:
378 ShenandoahHeap* const _heap;
379 const ShenandoahCollectionSet* const _cset;
380 Thread* const _thread;
381
382 template <class T>
383 inline void do_oop_work(T* p) {
384 T o = RawAccess<>::oop_load(p);
385 if (!CompressedOops::is_null(o)) {
386 oop obj = CompressedOops::decode_not_null(o);
387 if (_cset->is_in(obj)) {
388 oop fwd = ShenandoahForwarding::get_forwardee(obj);
389 if (EVAC && obj == fwd) {
390 fwd = _heap->evacuate_object(obj, _thread);
391 }
392 shenandoah_assert_forwarded_except(p, obj, _heap->cancelled_gc());
393 ShenandoahHeap::atomic_update_oop(fwd, p, o);
394 obj = fwd;
395 }
396 }
397 }
398
399 public:
400 ShenandoahUpdateEvacForCloneOopClosure() :
401 _heap(ShenandoahHeap::heap()),
402 _cset(_heap->collection_set()),
403 _thread(Thread::current()) {}
404
405 virtual void do_oop(oop* p) { do_oop_work(p); }
406 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
407 };
408
409 void ShenandoahBarrierSet::clone_evacuation(oop obj) {
410 assert(_heap->is_evacuation_in_progress(), "only during evacuation");
411 if (need_bulk_update(cast_from_oop<HeapWord*>(obj))) {
412 ShenandoahEvacOOMScope oom_evac_scope;
413 ShenandoahUpdateEvacForCloneOopClosure<true> cl;
414 obj->oop_iterate(&cl);
415 }
416 }
417
418 void ShenandoahBarrierSet::clone_update(oop obj) {
419 assert(_heap->is_update_refs_in_progress(), "only during update-refs");
420 if (need_bulk_update(cast_from_oop<HeapWord*>(obj))) {
421 ShenandoahUpdateEvacForCloneOopClosure<false> cl;
422 obj->oop_iterate(&cl);
423 }
424 }
425
426 template <DecoratorSet decorators, typename BarrierSetT>
427 void ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::clone_in_heap(oop src, oop dst, size_t count) {
428 // Hot code path, called from compiler/runtime. Make sure fast path is fast.
429
430 // Fix up src before doing the copy, if needed.
431 const char gc_state = ShenandoahThreadLocalData::gc_state(Thread::current());
432 if (gc_state > 0 && ShenandoahCloneBarrier) {
433 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set();
434 if ((gc_state & ShenandoahHeap::EVACUATION) != 0) {
435 bs->clone_evacuation(src);
436 } else if ((gc_state & ShenandoahHeap::UPDATE_REFS) != 0) {
437 bs->clone_update(src);
438 }
439 }
440
441 Raw::clone(src, dst, count);
442
443 // Safety: clone destination must be in young, otherwise we need card barriers.
444 shenandoah_assert_in_young_if(nullptr, dst, ShenandoahCardBarrier);
445 }
446
447 template <DecoratorSet decorators, typename BarrierSetT>
448 template <typename T>
449 OopCopyResult ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
450 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
451 size_t length) {
452 T* src = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw);
453 T* dst = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw);
454
455 ShenandoahBarrierSet* bs = ShenandoahBarrierSet::barrier_set();
456 bs->arraycopy_barrier(src, dst, length);
457 OopCopyResult result = Raw::oop_arraycopy_in_heap(src_obj, src_offset_in_bytes, src_raw, dst_obj, dst_offset_in_bytes, dst_raw, length);
458 if (ShenandoahCardBarrier) {
459 bs->write_ref_array((HeapWord*) dst, length);
460 }
461 return result;
462 }
463
464 template <class T, bool HAS_FWD, bool EVAC, bool ENQUEUE>
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