1 /* 2 * Copyright (c) 2013, 2015, 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_SHENANDOAHCONCURRENTMARK_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHCONCURRENTMARK_HPP 26 27 #include "gc/shared/taskqueue.hpp" 28 #include "gc/shared/workgroup.hpp" 29 30 typedef OverflowTaskQueue<oop, mtGC> OopOverflowTaskQueue; 31 typedef Padded<OopOverflowTaskQueue> SCMObjToScanQueue; 32 typedef GenericTaskQueueSet<SCMObjToScanQueue, mtGC> SCMObjToScanQueueSet; 33 34 class ShenandoahConcurrentMark; 35 36 #ifdef ASSERT 37 class ShenandoahVerifyRootsClosure1 : public OopClosure { 38 void do_oop(oop* p); 39 40 void do_oop(narrowOop* p) { 41 Unimplemented(); 42 } 43 }; 44 #endif 45 46 class ShenandoahMarkRefsClosure : public MetadataAwareOopClosure { 47 SCMObjToScanQueue* _queue; 48 ShenandoahHeap* _heap; 49 bool _update_refs; 50 ShenandoahConcurrentMark* _scm; 51 52 public: 53 ShenandoahMarkRefsClosure(SCMObjToScanQueue* q, bool update_refs); 54 55 void do_oop(narrowOop* p); 56 57 inline void do_oop(oop* p); 58 59 }; 60 61 class ShenandoahMarkObjsClosure : public ObjectClosure { 62 ShenandoahHeap* _heap; 63 size_t* _live_data; 64 ShenandoahMarkRefsClosure _mark_refs; 65 66 public: 67 ShenandoahMarkObjsClosure(SCMObjToScanQueue* q, bool update_refs); 68 69 ~ShenandoahMarkObjsClosure(); 70 71 inline void do_object(oop obj); 72 }; 73 74 class ShenandoahConcurrentMark: public CHeapObj<mtGC> { 75 76 private: 77 // The per-worker-thread work queues 78 SCMObjToScanQueueSet* _task_queues; 79 80 bool _aborted; 81 uint _max_conc_worker_id; 82 ParallelTaskTerminator* _terminator; 83 84 public: 85 // We need to do this later when the heap is already created. 86 void initialize(); 87 88 void mark_from_roots(); 89 90 // Prepares unmarked root objects by marking them and putting 91 // them into the marking task queue. 92 void prepare_unmarked_root_objs(); 93 void prepare_unmarked_root_objs_no_derived_ptrs(bool update_refs); 94 95 void finish_mark_from_roots(); 96 // Those are only needed public because they're called from closures. 97 98 SCMObjToScanQueue* get_queue(uint worker_id); 99 inline bool try_queue(SCMObjToScanQueue* q, ShenandoahMarkObjsClosure* cl); 100 inline bool try_to_steal(uint worker_id, ShenandoahMarkObjsClosure* cl, int *seed); 101 inline bool try_draining_an_satb_buffer(uint worker_id); 102 void drain_satb_buffers(uint worker_id, bool remark = false); 103 SCMObjToScanQueueSet* task_queues() { return _task_queues;} 104 uint max_conc_worker_id() { return _max_conc_worker_id; } 105 106 void cancel(); 107 108 private: 109 110 #ifdef ASSERT 111 void verify_roots(); 112 #endif 113 114 bool drain_one_satb_buffer(uint worker_id); 115 void weak_refs_work(); 116 117 ParallelTaskTerminator* terminator() { return _terminator;} 118 119 #if TASKQUEUE_STATS 120 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); 121 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; 122 void print_push_only_taskqueue_stats(outputStream* const st = gclog_or_tty) const; 123 void reset_taskqueue_stats(); 124 #endif // TASKQUEUE_STATS 125 126 }; 127 128 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHCONCURRENTMARK_HPP