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template <class T, StringDedupMode STRING_DEDUP>
void ShenandoahMark::do_task(ShenandoahObjToScanQueue* q, T* cl, ShenandoahLiveData* live_data, StringDedup::Requests* const req, ShenandoahMarkTask* task) {
oop obj = task->obj();
+ // TODO: This will push array chunks into the mark queue with no regard for
+ // generations. I don't think it will break anything, but the young generation
+ // scan might end up processing some old generation array chunks.
+
shenandoah_assert_not_forwarded(nullptr, obj);
shenandoah_assert_marked(nullptr, obj);
shenandoah_assert_not_in_cset_except(nullptr, obj, ShenandoahHeap::heap()->cancelled_gc());
// Are we in weak subgraph scan?
ShenandoahHeapRegion* region = heap->get_region(region_idx);
size_t size = obj->size();
if (!region->is_humongous_start()) {
assert(!region->is_humongous(), "Cannot have continuations here");
+ assert(region->affiliation() != FREE, "Do not count live data within Free Regular Region " SIZE_FORMAT, region_idx);
ShenandoahLiveData cur = live_data[region_idx];
size_t new_val = size + cur;
if (new_val >= SHENANDOAH_LIVEDATA_MAX) {
// overflow, flush to region data
region->increase_live_data_gc_words(new_val);
}
} else {
shenandoah_assert_in_correct_region(nullptr, obj);
size_t num_regions = ShenandoahHeapRegion::required_regions(size * HeapWordSize);
+ assert(region->affiliation() != FREE, "Do not count live data within FREE Humongous Start Region " SIZE_FORMAT, region_idx);
for (size_t i = region_idx; i < region_idx + num_regions; i++) {
ShenandoahHeapRegion* chain_reg = heap->get_region(i);
assert(chain_reg->is_humongous(), "Expecting a humongous region");
+ assert(chain_reg->affiliation() != FREE, "Do not count live data within FREE Humongous Continuation Region " SIZE_FORMAT, i);
chain_reg->increase_live_data_gc_words(chain_reg->used() >> LogHeapWordSize);
}
}
}
#endif
array->oop_iterate_range(cl, from, to);
}
class ShenandoahSATBBufferClosure : public SATBBufferClosure {
private:
ShenandoahObjToScanQueue* _queue;
ShenandoahHeap* _heap;
ShenandoahMarkingContext* const _mark_context;
public:
! ShenandoahSATBBufferClosure(ShenandoahObjToScanQueue* q) :
_queue(q),
_heap(ShenandoahHeap::heap()),
_mark_context(_heap->marking_context())
{
}
void do_buffer(void **buffer, size_t size) {
! assert(size == 0 || !_heap->has_forwarded_objects(), "Forwarded objects are not expected here");
for (size_t i = 0; i < size; ++i) {
oop *p = (oop *) &buffer[i];
! ShenandoahMark::mark_through_ref<oop>(p, _queue, _mark_context, false);
}
}
};
! template<class T>
! inline void ShenandoahMark::mark_through_ref(T* p, ShenandoahObjToScanQueue* q, ShenandoahMarkingContext* const mark_context, bool weak) {
T o = RawAccess<>::oop_load(p);
if (!CompressedOops::is_null(o)) {
oop obj = CompressedOops::decode_not_null(o);
shenandoah_assert_not_forwarded(p, obj);
! shenandoah_assert_not_in_cset_except(p, obj, ShenandoahHeap::heap()->cancelled_gc());
!
! bool skip_live = false;
! bool marked;
! if (weak) {
! marked = mark_context->mark_weak(obj);
! } else {
! marked = mark_context->mark_strong(obj, /* was_upgraded = */ skip_live);
! }
! if (marked) {
! bool pushed = q->push(ShenandoahMarkTask(obj, skip_live, weak));
! assert(pushed, "overflow queue should always succeed pushing");
}
! shenandoah_assert_marked(p, obj);
}
}
ShenandoahObjToScanQueueSet* ShenandoahMark::task_queues() const {
return _task_queues;
}
ShenandoahObjToScanQueue* ShenandoahMark::get_queue(uint index) const {
return _task_queues->queue(index);
}
#endif // SHARE_GC_SHENANDOAH_SHENANDOAHMARK_INLINE_HPP
#endif
array->oop_iterate_range(cl, from, to);
}
+ template <GenerationMode GENERATION>
class ShenandoahSATBBufferClosure : public SATBBufferClosure {
private:
ShenandoahObjToScanQueue* _queue;
+ ShenandoahObjToScanQueue* _old;
ShenandoahHeap* _heap;
ShenandoahMarkingContext* const _mark_context;
public:
! ShenandoahSATBBufferClosure(ShenandoahObjToScanQueue* q, ShenandoahObjToScanQueue* old) :
_queue(q),
+ _old(old),
_heap(ShenandoahHeap::heap()),
_mark_context(_heap->marking_context())
{
}
void do_buffer(void **buffer, size_t size) {
! assert(size == 0 || !_heap->has_forwarded_objects() || _heap->is_concurrent_old_mark_in_progress(), "Forwarded objects are not expected here");
for (size_t i = 0; i < size; ++i) {
oop *p = (oop *) &buffer[i];
! ShenandoahMark::mark_through_ref<oop, GENERATION>(p, _queue, _old, _mark_context, false);
}
}
};
! template<GenerationMode GENERATION>
! bool ShenandoahMark::in_generation(oop obj) {
+ // Each in-line expansion of in_generation() resolves GENERATION at compile time.
+ if (GENERATION == YOUNG)
+ return ShenandoahHeap::heap()->is_in_young(obj);
+ else if (GENERATION == OLD)
+ return ShenandoahHeap::heap()->is_in_old(obj);
+ else if (GENERATION == GLOBAL)
+ return true;
+ else
+ return false;
+ }
+
+ template<class T, GenerationMode GENERATION>
+ inline void ShenandoahMark::mark_through_ref(T *p, ShenandoahObjToScanQueue* q, ShenandoahObjToScanQueue* old, ShenandoahMarkingContext* const mark_context, bool weak) {
T o = RawAccess<>::oop_load(p);
if (!CompressedOops::is_null(o)) {
oop obj = CompressedOops::decode_not_null(o);
+ ShenandoahHeap* heap = ShenandoahHeap::heap();
shenandoah_assert_not_forwarded(p, obj);
! shenandoah_assert_not_in_cset_except(p, obj, heap->cancelled_gc());
! if (in_generation<GENERATION>(obj)) {
! mark_ref(q, mark_context, weak, obj);
! shenandoah_assert_marked(p, obj);
! if (heap->mode()->is_generational()) {
! // TODO: As implemented herein, GLOBAL collections reconstruct the card table during GLOBAL concurrent
! // marking. Note that the card table is cleaned at init_mark time so it needs to be reconstructed to support
! // future young-gen collections. It might be better to reconstruct card table in
! // ShenandoahHeapRegion::global_oop_iterate_and_fill_dead. We could either mark all live memory as dirty, or could
! // use the GLOBAL update-refs scanning of pointers to determine precisely which cards to flag as dirty.
! if (GENERATION == YOUNG && heap->is_in_old(p)) {
! // Mark card as dirty because remembered set scanning still finds interesting pointer.
+ heap->mark_card_as_dirty((HeapWord*)p);
+ } else if (GENERATION == GLOBAL && heap->is_in_old(p) && heap->is_in_young(obj)) {
+ // Mark card as dirty because GLOBAL marking finds interesting pointer.
+ heap->mark_card_as_dirty((HeapWord*)p);
+ }
+ }
+ } else if (old != nullptr) {
+ // Young mark, bootstrapping old or concurrent with old marking.
+ mark_ref(old, mark_context, weak, obj);
+ shenandoah_assert_marked(p, obj);
+ } else if (GENERATION == OLD) {
+ // Old mark, found a young pointer.
+ // TODO: Rethink this: may be redundant with dirtying of cards identified during young-gen remembered set scanning
+ // and by mutator write barriers. Assert
+ if (heap->is_in(p)) {
+ assert(heap->is_in_young(obj), "Expected young object.");
+ heap->mark_card_as_dirty(p);
+ }
}
+ }
+ }
! inline void ShenandoahMark::mark_ref(ShenandoahObjToScanQueue* q,
+ ShenandoahMarkingContext* const mark_context,
+ bool weak, oop obj) {
+ bool skip_live = false;
+ bool marked;
+ if (weak) {
+ marked = mark_context->mark_weak(obj);
+ } else {
+ marked = mark_context->mark_strong(obj, /* was_upgraded = */ skip_live);
+ }
+ if (marked) {
+ bool pushed = q->push(ShenandoahMarkTask(obj, skip_live, weak));
+ assert(pushed, "overflow queue should always succeed pushing");
}
}
ShenandoahObjToScanQueueSet* ShenandoahMark::task_queues() const {
return _task_queues;
}
ShenandoahObjToScanQueue* ShenandoahMark::get_queue(uint index) const {
return _task_queues->queue(index);
}
+
+ ShenandoahObjToScanQueue* ShenandoahMark::get_old_queue(uint index) const {
+ if (_old_gen_task_queues != nullptr) {
+ return _old_gen_task_queues->queue(index);
+ }
+ return nullptr;
+ }
+
#endif // SHARE_GC_SHENANDOAH_SHENANDOAHMARK_INLINE_HPP
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