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_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP 26 27 #include "memory/allocation.hpp" 28 #include "gc/shenandoah/shenandoahHeap.hpp" 29 #include "gc/shenandoah/shenandoahHeapRegionSet.hpp" 30 #include "gc/shenandoah/shenandoahTaskqueue.hpp" 31 #include "runtime/thread.hpp" 32 33 class ShenandoahTraversalGC : public CHeapObj<mtGC> { 34 private: 35 ShenandoahHeap* const _heap; 36 ShenandoahObjToScanQueueSet* const _task_queues; 37 ShenandoahHeapRegionSet _traversal_set; 38 39 public: 40 ShenandoahTraversalGC(ShenandoahHeap* heap, size_t num_regions); 41 ~ShenandoahTraversalGC(); 42 43 ShenandoahHeapRegionSet* traversal_set() { return &_traversal_set; } 44 45 void reset(); 46 void prepare(); 47 void init_traversal_collection(); 48 void concurrent_traversal_collection(); 49 void final_traversal_collection(); 50 51 template <class T, bool STRING_DEDUP, bool DEGEN> 52 inline void process_oop(T* p, Thread* thread, ShenandoahObjToScanQueue* queue, ShenandoahMarkingContext* const mark_context); 53 54 bool check_and_handle_cancelled_gc(ShenandoahTaskTerminator* terminator, bool sts_yield); 55 56 ShenandoahObjToScanQueueSet* task_queues(); 57 58 void main_loop(uint worker_id, ShenandoahTaskTerminator* terminator, bool sts_yield); 59 60 private: 61 void prepare_regions(); 62 63 template <class T> 64 void main_loop_work(T* cl, jushort* live_data, uint worker_id, ShenandoahTaskTerminator* terminator, bool sts_yield); 65 66 void preclean_weak_refs(); 67 void weak_refs_work(); 68 void weak_refs_work_doit(); 69 70 void fixup_roots(); 71 }; 72 73 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_HPP