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.
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 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 
 38 class G1FullGCPrepareTask : public G1FullGCTask {
 39 protected:
 40   volatile bool     _freed_regions;
 41   HeapRegionClaimer _hrclaimer;
 42 
 43   void set_freed_regions();
 44 
 45 private:
 46   template <bool ALT_FWD>
 47   void prepare_serial_compaction_impl();
 48 
 49 public:
 50   G1FullGCPrepareTask(G1FullCollector* collector);
 51   void work(uint worker_id);
 52   void prepare_serial_compaction();
 53   bool has_freed_regions();
 54 
 55 protected:
 56   class G1CalculatePointersClosure : public HeapRegionClosure {
 57   private:
 58     template<bool is_humongous>
 59     void free_pinned_region(HeapRegion* hr);
 60   protected:
 61     G1CollectedHeap* _g1h;
 62     G1FullCollector* _collector;
 63     G1CMBitMap* _bitmap;
 64     G1FullGCCompactionPoint* _cp;
 65     bool _regions_freed;
 66 
 67     bool should_compact(HeapRegion* hr);
 68     void prepare_for_compaction(HeapRegion* hr);
 69     void prepare_for_compaction_work(G1FullGCCompactionPoint* cp, HeapRegion* hr);
 70 
 71     void reset_region_metadata(HeapRegion* hr);
 72 
 73   public:
 74     G1CalculatePointersClosure(G1FullCollector* collector,
 75                                G1FullGCCompactionPoint* cp);
 76 
 77     bool do_heap_region(HeapRegion* hr);
 78     bool freed_regions();
 79   };
 80 
 81   template <bool ALT_FWD>
 82   class G1PrepareCompactLiveClosure : public StackObj {
 83     G1FullGCCompactionPoint* _cp;
 84 
 85   public:
 86     G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp);
 87     size_t apply(oop object);
 88   };
 89 
 90   template <bool ALT_FWD>
 91   class G1RePrepareClosure : public StackObj {
 92     G1FullGCCompactionPoint* _cp;
 93     HeapRegion* _current;
 94 
 95   public:
 96     G1RePrepareClosure(G1FullGCCompactionPoint* hrcp,
 97                        HeapRegion* hr) :
 98         _cp(hrcp),
 99         _current(hr) { }
100 
101     size_t apply(oop object);
102   };
103 };
104 
105 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP