1 /* 2 * Copyright (c) 2018, Red Hat, Inc. and/or its affiliates. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_INLINE_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_INLINE_HPP 26 27 #include "gc/shared/markBitMap.inline.hpp" 28 #include "gc/shenandoah/shenandoahBarrierSet.inline.hpp" 29 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 30 #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp" 31 #include "gc/shenandoah/shenandoahHeapRegionSet.inline.hpp" 32 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp" 33 #include "gc/shenandoah/shenandoahStringDedup.hpp" 34 #include "gc/shenandoah/shenandoahTraversalGC.hpp" 35 #include "gc/shenandoah/shenandoahTaskqueue.hpp" 36 #include "memory/iterator.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 39 template <class T, bool STRING_DEDUP, bool DEGEN, bool UPDATE_MATRIX> 40 void ShenandoahTraversalGC::process_oop(T* p, Thread* thread, ShenandoahObjToScanQueue* queue, oop base_obj) { 41 T o = RawAccess<>::oop_load(p); 42 if (!CompressedOops::is_null(o)) { 43 oop obj = CompressedOops::decode_not_null(o); 44 bool update_matrix = true; 45 if (DEGEN) { 46 oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); 47 if (!oopDesc::unsafe_equals(obj, forw)) { 48 // Update reference. 49 RawAccess<IS_NOT_NULL>::oop_store(p, forw); 50 } 51 obj = forw; 52 } else if (_heap->in_collection_set(obj)) { 53 oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); 54 if (oopDesc::unsafe_equals(obj, forw)) { 55 forw = _heap->evacuate_object(obj, thread); 56 } 57 // tty->print_cr("NORMAL visit: "PTR_FORMAT", obj: "PTR_FORMAT" to "PTR_FORMAT, p2i(p), p2i(obj), p2i(forw)); 58 assert(! oopDesc::unsafe_equals(obj, forw) || _heap->cancelled_gc(), "must be evacuated"); 59 // Update reference. 60 oop previous = _heap->atomic_compare_exchange_oop(forw, p, obj); 61 if (UPDATE_MATRIX && !oopDesc::unsafe_equals(previous, obj)) { 62 update_matrix = false; 63 } 64 obj = forw; 65 } 66 67 if (UPDATE_MATRIX && update_matrix) { 68 shenandoah_assert_not_forwarded_except(p, obj, _heap->cancelled_gc()); 69 const void* src; 70 if (!_heap->is_in_reserved(p)) { 71 src = (const void*)(HeapWord*) obj; 72 } else { 73 src = p; 74 } 75 if (src != NULL) { 76 _matrix->set_connected(src, obj); 77 } 78 } 79 80 if (_heap->next_marking_context()->mark(obj)) { 81 bool succeeded = queue->push(ShenandoahMarkTask(obj)); 82 assert(succeeded, "must succeed to push to task queue"); 83 84 if (STRING_DEDUP && ShenandoahStringDedup::is_candidate(obj) && !_heap->cancelled_gc()) { 85 assert(ShenandoahStringDedup::is_enabled(), "Must be enabled"); 86 // Only dealing with to-space string, so that we can avoid evac-oom protocol, which is costly here. 87 assert(!_heap->in_collection_set(obj), "Must be in to-space"); 88 ShenandoahStringDedup::enqueue_candidate(obj); 89 } 90 } 91 } 92 } 93 94 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_INLINE_HPP