294 assert(is_from_young == _g1h->heap_region_containing(old)->is_young(),
295 "sanity");
296 assert(is_to_young == _g1h->heap_region_containing(obj)->is_young(),
297 "sanity");
298 G1StringDedup::enqueue_from_evacuation(is_from_young,
299 is_to_young,
300 _worker_id,
301 obj);
302 }
303
304 _surviving_young_words[young_index] += word_sz;
305
306 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) {
307 // We keep track of the next start index in the length field of
308 // the to-space object. The actual length can be found in the
309 // length field of the from-space object.
310 arrayOop(obj)->set_length(0);
311 oop* old_p = set_partial_array_mask(old);
312 do_oop_partial_array(old_p);
313 } else {
314 _scanner.set_scanning_in_young(dest_state.is_young());
315 obj->oop_iterate_backwards(&_scanner);
316 }
317 return obj;
318 } else {
319 _plab_allocator->undo_allocation(dest_state, obj_ptr, word_sz);
320 return forward_ptr;
321 }
322 }
323
324 G1ParScanThreadState* G1ParScanThreadStateSet::state_for_worker(uint worker_id) {
325 assert(worker_id < _n_workers, "out of bounds access");
326 if (_states[worker_id] == NULL) {
327 _states[worker_id] = new G1ParScanThreadState(_g1h, worker_id, _young_cset_length);
328 }
329 return _states[worker_id];
330 }
331
332 const size_t* G1ParScanThreadStateSet::surviving_young_words() const {
333 assert(_flushed, "thread local state from the per thread states should have been flushed");
334 return _surviving_young_words_total;
349 _states[worker_index] = NULL;
350 }
351 _flushed = true;
352 }
353
354 oop G1ParScanThreadState::handle_evacuation_failure_par(oop old, markOop m) {
355 assert(_g1h->is_in_cset(old), "Object " PTR_FORMAT " should be in the CSet", p2i(old));
356
357 oop forward_ptr = old->forward_to_atomic(old, m, memory_order_relaxed);
358 if (forward_ptr == NULL) {
359 // Forward-to-self succeeded. We are the "owner" of the object.
360 HeapRegion* r = _g1h->heap_region_containing(old);
361
362 if (!r->evacuation_failed()) {
363 r->set_evacuation_failed(true);
364 _g1h->hr_printer()->evac_failure(r);
365 }
366
367 _g1h->preserve_mark_during_evac_failure(_worker_id, old, m);
368
369 _scanner.set_scanning_in_young(r->is_young());
370 old->oop_iterate_backwards(&_scanner);
371
372 return old;
373 } else {
374 // Forward-to-self failed. Either someone else managed to allocate
375 // space for this object (old != forward_ptr) or they beat us in
376 // self-forwarding it (old == forward_ptr).
377 assert(old == forward_ptr || !_g1h->is_in_cset(forward_ptr),
378 "Object " PTR_FORMAT " forwarded to: " PTR_FORMAT " "
379 "should not be in the CSet",
380 p2i(old), p2i(forward_ptr));
381 return forward_ptr;
382 }
383 }
384 G1ParScanThreadStateSet::G1ParScanThreadStateSet(G1CollectedHeap* g1h, uint n_workers, size_t young_cset_length) :
385 _g1h(g1h),
386 _states(NEW_C_HEAP_ARRAY(G1ParScanThreadState*, n_workers, mtGC)),
387 _surviving_young_words_total(NEW_C_HEAP_ARRAY(size_t, young_cset_length, mtGC)),
388 _young_cset_length(young_cset_length),
389 _n_workers(n_workers),
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294 assert(is_from_young == _g1h->heap_region_containing(old)->is_young(),
295 "sanity");
296 assert(is_to_young == _g1h->heap_region_containing(obj)->is_young(),
297 "sanity");
298 G1StringDedup::enqueue_from_evacuation(is_from_young,
299 is_to_young,
300 _worker_id,
301 obj);
302 }
303
304 _surviving_young_words[young_index] += word_sz;
305
306 if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) {
307 // We keep track of the next start index in the length field of
308 // the to-space object. The actual length can be found in the
309 // length field of the from-space object.
310 arrayOop(obj)->set_length(0);
311 oop* old_p = set_partial_array_mask(old);
312 do_oop_partial_array(old_p);
313 } else {
314 G1ScanInYoungSetter x(&_scanner, dest_state.is_young());
315 obj->oop_iterate_backwards(&_scanner);
316 }
317 return obj;
318 } else {
319 _plab_allocator->undo_allocation(dest_state, obj_ptr, word_sz);
320 return forward_ptr;
321 }
322 }
323
324 G1ParScanThreadState* G1ParScanThreadStateSet::state_for_worker(uint worker_id) {
325 assert(worker_id < _n_workers, "out of bounds access");
326 if (_states[worker_id] == NULL) {
327 _states[worker_id] = new G1ParScanThreadState(_g1h, worker_id, _young_cset_length);
328 }
329 return _states[worker_id];
330 }
331
332 const size_t* G1ParScanThreadStateSet::surviving_young_words() const {
333 assert(_flushed, "thread local state from the per thread states should have been flushed");
334 return _surviving_young_words_total;
349 _states[worker_index] = NULL;
350 }
351 _flushed = true;
352 }
353
354 oop G1ParScanThreadState::handle_evacuation_failure_par(oop old, markOop m) {
355 assert(_g1h->is_in_cset(old), "Object " PTR_FORMAT " should be in the CSet", p2i(old));
356
357 oop forward_ptr = old->forward_to_atomic(old, m, memory_order_relaxed);
358 if (forward_ptr == NULL) {
359 // Forward-to-self succeeded. We are the "owner" of the object.
360 HeapRegion* r = _g1h->heap_region_containing(old);
361
362 if (!r->evacuation_failed()) {
363 r->set_evacuation_failed(true);
364 _g1h->hr_printer()->evac_failure(r);
365 }
366
367 _g1h->preserve_mark_during_evac_failure(_worker_id, old, m);
368
369 G1ScanInYoungSetter x(&_scanner, r->is_young());
370 old->oop_iterate_backwards(&_scanner);
371
372 return old;
373 } else {
374 // Forward-to-self failed. Either someone else managed to allocate
375 // space for this object (old != forward_ptr) or they beat us in
376 // self-forwarding it (old == forward_ptr).
377 assert(old == forward_ptr || !_g1h->is_in_cset(forward_ptr),
378 "Object " PTR_FORMAT " forwarded to: " PTR_FORMAT " "
379 "should not be in the CSet",
380 p2i(old), p2i(forward_ptr));
381 return forward_ptr;
382 }
383 }
384 G1ParScanThreadStateSet::G1ParScanThreadStateSet(G1CollectedHeap* g1h, uint n_workers, size_t young_cset_length) :
385 _g1h(g1h),
386 _states(NEW_C_HEAP_ARRAY(G1ParScanThreadState*, n_workers, mtGC)),
387 _surviving_young_words_total(NEW_C_HEAP_ARRAY(size_t, young_cset_length, mtGC)),
388 _young_cset_length(young_cset_length),
389 _n_workers(n_workers),
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