1 /* 2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved. 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_implementation/shenandoah/shenandoahAsserts.hpp" 28 #include "gc_implementation/shenandoah/shenandoahBarrierSet.inline.hpp" 29 #include "gc_implementation/shenandoah/shenandoahHeap.inline.hpp" 30 #include "gc_implementation/shenandoah/shenandoahMarkingContext.inline.hpp" 31 #include "gc_implementation/shenandoah/shenandoahStringDedup.hpp" 32 #include "gc_implementation/shenandoah/shenandoahTraversalGC.hpp" 33 #include "gc_implementation/shenandoah/shenandoahTaskqueue.hpp" 34 #include "gc_implementation/shenandoah/shenandoahTaskqueue.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 37 template <class T, bool STRING_DEDUP, bool DEGEN, bool ATOMIC_UPDATE> 38 void ShenandoahTraversalGC::process_oop(T* p, Thread* thread, ShenandoahObjToScanQueue* queue, ShenandoahMarkingContext* const mark_context, ShenandoahStrDedupQueue* dq) { 39 T o = oopDesc::load_heap_oop(p); 40 if (!oopDesc::is_null(o)) { 41 oop obj = oopDesc::decode_heap_oop_not_null(o); 42 if (DEGEN) { 43 assert(!ATOMIC_UPDATE, "Degen path assumes non-atomic updates"); 44 oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); 45 if (obj != forw) { 46 // Update reference. 47 oopDesc::encode_store_heap_oop_not_null(p, forw); 48 } 49 obj = forw; 50 } else if (_heap->in_collection_set(obj)) { 51 oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj); 52 if (obj == forw) { 53 forw = _heap->evacuate_object(obj, thread); 54 } 55 shenandoah_assert_forwarded_except(p, obj, _heap->cancelled_gc()); 56 // Update reference. 57 if (ATOMIC_UPDATE) { 58 _heap->cas_oop(forw, p, obj); 59 } else { 60 oopDesc::encode_store_heap_oop_not_null(p, forw); 61 } 62 obj = forw; 63 } 64 65 shenandoah_assert_not_forwarded(p, obj); 66 shenandoah_assert_not_in_cset_except(p, obj, _heap->cancelled_gc()); 67 68 if (mark_context->mark(obj)) { 69 bool succeeded = queue->push(ShenandoahMarkTask(obj)); 70 assert(succeeded, "must succeed to push to task queue"); 71 72 if (STRING_DEDUP && ShenandoahStringDedup::is_candidate(obj) && !_heap->cancelled_gc()) { 73 assert(ShenandoahStringDedup::is_enabled(), "Must be enabled"); 74 // Only dealing with to-space string, so that we can avoid evac-oom protocol, which is costly here. 75 shenandoah_assert_not_in_cset(p, obj); 76 assert(dq != NULL, "Dedup queue not set"); 77 ShenandoahStringDedup::enqueue_candidate(obj, dq); 78 } 79 } 80 } 81 } 82 83 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_INLINE_HPP