1 /*
2  * Copyright (c) 2017, 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/g1StringDedup.hpp"
33 #include "gc/g1/heapRegionManager.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 
36 class G1CMBitMap;
37 
38 class G1FullGCPrepareTask : public G1FullGCTask {
39 protected:
40   volatile bool     _freed_regions;
41   HeapRegionClaimer _hrclaimer;
42 
43   void set_freed_regions();
44 
45 public:
46   G1FullGCPrepareTask(G1FullCollector* collector);
47   void work(uint worker_id);
48   void prepare_serial_compaction();
49   bool has_freed_regions();
50 
51 protected:
52   class G1CalculatePointersClosure : public HeapRegionClosure {
53   protected:
54     G1CollectedHeap* _g1h;
55     G1CMBitMap* _bitmap;
56     G1FullGCCompactionPoint* _cp;
57     uint _humongous_regions_removed;
58 
59     virtual void prepare_for_compaction(HeapRegion* hr);
60     void prepare_for_compaction_work(G1FullGCCompactionPoint* cp, HeapRegion* hr);
61     void free_humongous_region(HeapRegion* hr);
62     void reset_region_metadata(HeapRegion* hr);
63 
64   public:
65     G1CalculatePointersClosure(G1CMBitMap* bitmap,
66                                G1FullGCCompactionPoint* cp);
67 
68     void update_sets();
69     bool do_heap_region(HeapRegion* hr);
70     bool freed_regions();
71   };
72 
73   class G1PrepareCompactLiveClosure : public StackObj {
74     G1FullGCCompactionPoint* _cp;
75 
76   public:
77     G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp);
78     size_t apply(oop object);
79   };
80 
81   class G1RePrepareClosure : public StackObj {
82     G1FullGCCompactionPoint* _cp;
83     HeapRegion* _current;
84 
85   public:
G1RePrepareClosure(G1FullGCCompactionPoint * hrcp,HeapRegion * hr)86     G1RePrepareClosure(G1FullGCCompactionPoint* hrcp,
87                        HeapRegion* hr) :
88         _cp(hrcp),
89         _current(hr) { }
90 
91     size_t apply(oop object);
92   };
93 };
94 
95 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP
96