1 /*
  2  * Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_GC_G1_G1FULLGCPREPARETASK_HPP
 26 #define SHARE_GC_G1_G1FULLGCPREPARETASK_HPP
 27 
 28 #include "gc/g1/g1FullGCCompactionPoint.hpp"
 29 #include "gc/g1/g1FullGCScope.hpp"
 30 #include "gc/g1/g1FullGCTask.hpp"
 31 #include "gc/g1/g1RootProcessor.hpp"
 32 #include "gc/g1/heapRegionManager.hpp"
 33 #include "gc/shared/referenceProcessor.hpp"
 34 
 35 class G1CMBitMap;
 36 class G1FullCollector;
 37 class SlidingForwarding;
 38 
 39 class G1FullGCPrepareTask : public G1FullGCTask {
 40 protected:
 41   volatile bool     _freed_regions;
 42   HeapRegionClaimer _hrclaimer;
 43 
 44   void set_freed_regions();
 45 
 46 public:
 47   G1FullGCPrepareTask(G1FullCollector* collector);
 48   void work(uint worker_id);
 49   void prepare_serial_compaction();
 50   bool has_freed_regions();
 51 
 52 protected:
 53   class G1CalculatePointersClosure : public HeapRegionClosure {
 54   private:
 55     template<bool is_humongous>
 56     void free_pinned_region(HeapRegion* hr);
 57   protected:
 58     G1CollectedHeap* _g1h;
 59     G1FullCollector* _collector;
 60     G1CMBitMap* _bitmap;
 61     G1FullGCCompactionPoint* _cp;
 62     bool _regions_freed;
 63 
 64     bool should_compact(HeapRegion* hr);
 65     void prepare_for_compaction(HeapRegion* hr);
 66     void prepare_for_compaction_work(G1FullGCCompactionPoint* cp, HeapRegion* hr);
 67 
 68     void reset_region_metadata(HeapRegion* hr);
 69 
 70   public:
 71     G1CalculatePointersClosure(G1FullCollector* collector,
 72                                G1FullGCCompactionPoint* cp);
 73 
 74     bool do_heap_region(HeapRegion* hr);
 75     bool freed_regions();
 76   };
 77 
 78   class G1PrepareCompactLiveClosure : public StackObj {
 79     G1FullGCCompactionPoint* _cp;
 80     SlidingForwarding* const _forwarding;
 81 
 82   public:
 83     G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp);
 84     size_t apply(oop object);
 85   };
 86 
 87   class G1RePrepareClosure : public StackObj {
 88     G1FullGCCompactionPoint* _cp;
 89     HeapRegion* _current;
 90     SlidingForwarding* const _forwarding;
 91 
 92   public:
 93     G1RePrepareClosure(G1FullGCCompactionPoint* hrcp,
 94                        HeapRegion* hr) :
 95         _cp(hrcp),
 96         _current(hr),
 97         _forwarding(G1CollectedHeap::heap()->forwarding()) { }
 98 
 99     size_t apply(oop object);
100   };
101 };
102 
103 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP