1 /*
 2  * Copyright (c) 2017, 2022, 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_G1FULLGCOOPCLOSURES_HPP
26 #define SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP
27 
28 #include "gc/shared/verifyOption.hpp"
29 #include "memory/iterator.hpp"
30 
31 class G1CollectedHeap;
32 class G1FullCollector;
33 class G1CMBitMap;
34 class G1FullGCMarker;
35 
36 // Below are closures used by the G1 Full GC.
37 class G1IsAliveClosure : public BoolObjectClosure {
38   G1FullCollector* _collector;
39   G1CMBitMap* _bitmap;
40 
41 public:
42   G1IsAliveClosure(G1FullCollector* collector);
43   G1IsAliveClosure(G1FullCollector* collector, G1CMBitMap* bitmap) :
44     _collector(collector), _bitmap(bitmap) { }
45 
46   virtual bool do_object_b(oop p);
47 };
48 
49 class G1FullKeepAliveClosure: public OopClosure {
50   G1FullGCMarker* _marker;
51   template <class T>
52   inline void do_oop_work(T* p);
53 
54 public:
55   G1FullKeepAliveClosure(G1FullGCMarker* pm) : _marker(pm) { }
56 
57   virtual void do_oop(oop* p);
58   virtual void do_oop(narrowOop* p);
59 };
60 
61 class G1MarkAndPushClosure : public ClaimMetadataVisitingOopIterateClosure {
62   G1FullGCMarker* _marker;
63   uint _worker_id;
64 
65 public:
66   G1MarkAndPushClosure(uint worker_id, G1FullGCMarker* marker, int claim, ReferenceDiscoverer* ref) :
67     ClaimMetadataVisitingOopIterateClosure(claim, ref),
68     _marker(marker),
69     _worker_id(worker_id) { }
70 
71   template <class T> inline void do_oop_work(T* p);
72   virtual void do_oop(oop* p);
73   virtual void do_oop(narrowOop* p);
74 };
75 
76 template <bool ALT_FWD>
77 class G1AdjustClosure : public BasicOopIterateClosure {
78   G1FullCollector* _collector;
79 
80   template <class T> inline void adjust_pointer(T* p);
81 public:
82   G1AdjustClosure(G1FullCollector* collector) : _collector(collector) { }
83   template <class T> void do_oop_work(T* p) { adjust_pointer(p); }
84   virtual void do_oop(oop* p);
85   virtual void do_oop(narrowOop* p);
86 
87   virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
88 };
89 
90 class G1FollowStackClosure: public VoidClosure {
91   G1FullGCMarker* _marker;
92 
93 public:
94   G1FollowStackClosure(G1FullGCMarker* marker) : _marker(marker) {}
95   virtual void do_void();
96 };
97 
98 #endif // SHARE_GC_G1_G1FULLGCOOPCLOSURES_HPP