1 /*
2 * Copyright (c) 2001, 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.
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23 */
24
25 #ifndef SHARE_VM_GC_G1_G1OOPCLOSURES_HPP
26 #define SHARE_VM_GC_G1_G1OOPCLOSURES_HPP
27
28 #include "gc/g1/g1InCSetState.hpp"
29 #include "memory/iterator.hpp"
30 #include "oops/markOop.hpp"
31
32 class HeapRegion;
33 class G1CollectedHeap;
34 class G1RemSet;
35 class G1ConcurrentMark;
36 class DirtyCardToOopClosure;
37 class G1CMBitMap;
38 class G1ParScanThreadState;
39 class G1CMTask;
40 class ReferenceProcessor;
41
42 class G1ScanClosureBase : public ExtendedOopClosure {
43 protected:
44 G1CollectedHeap* _g1;
45 G1ParScanThreadState* _par_scan_state;
46 HeapRegion* _from;
47
48 G1ScanClosureBase(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
49 ~G1ScanClosureBase() { }
50
51 template <class T>
52 inline void prefetch_and_push(T* p, oop const obj);
53
54 template <class T>
55 inline void handle_non_cset_obj_common(InCSetState const state, T* p, oop const obj);
56 public:
57 // This closure needs special handling for InstanceRefKlass.
58 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
59 void set_region(HeapRegion* from) { _from = from; }
60 };
61
62 // Used during the Update RS phase to refine remaining cards in the DCQ during garbage collection.
63 class G1ScanObjsDuringUpdateRSClosure: public G1ScanClosureBase {
64 uint _worker_i;
65
66 public:
67 G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h,
68 G1ParScanThreadState* pss,
69 uint worker_i) :
70 G1ScanClosureBase(g1h, pss), _worker_i(worker_i) { }
71
72 template <class T> void do_oop_nv(T* p);
73 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
74 virtual void do_oop(oop* p) { do_oop_nv(p); }
75 };
76
77 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection.
78 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase {
79 public:
80 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1,
81 G1ParScanThreadState* par_scan_state):
82 G1ScanClosureBase(g1, par_scan_state) { }
83
84 template <class T> void do_oop_nv(T* p);
85 virtual void do_oop(oop* p) { do_oop_nv(p); }
86 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
87 };
88
89 // This closure is applied to the fields of the objects that have just been copied during evacuation.
90 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase {
91 public:
92 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
93 G1ScanClosureBase(g1, par_scan_state) { }
94
95 template <class T> void do_oop_nv(T* p);
96 virtual void do_oop(oop* p) { do_oop_nv(p); }
97 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
98
99 void set_ref_processor(ReferenceProcessor* rp) {
100 set_ref_processor_internal(rp);
101 }
102 };
103
104 // Add back base class for metadata
105 class G1ParCopyHelper : public OopClosure {
106 protected:
107 G1CollectedHeap* _g1;
108 G1ParScanThreadState* _par_scan_state;
109 uint _worker_id; // Cache value from par_scan_state.
110 G1ConcurrentMark* _cm;
111
112 // Mark the object if it's not already marked. This is used to mark
113 // objects pointed to by roots that are guaranteed not to move
114 // during the GC (i.e., non-CSet objects). It is MT-safe.
115 inline void mark_object(oop obj);
116
117 // Mark the object if it's not already marked. This is used to mark
118 // objects pointed to by roots that have been forwarded during a
119 // GC. It is MT-safe.
120 inline void mark_forwarded_object(oop from_obj, oop to_obj);
121
122 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
123 ~G1ParCopyHelper() { }
124 };
125
126 enum G1Barrier {
127 G1BarrierNone,
128 G1BarrierKlass
129 };
130
131 enum G1Mark {
132 G1MarkNone,
133 G1MarkFromRoot,
134 G1MarkPromotedFromRoot
135 };
136
137 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext>
138 class G1ParCopyClosure : public G1ParCopyHelper {
139 public:
140 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
141 G1ParCopyHelper(g1, par_scan_state) { }
142
143 template <class T> void do_oop_work(T* p);
144 virtual void do_oop(oop* p) { do_oop_work(p); }
145 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
146 };
147
148 // Closure for iterating over object fields during concurrent marking
149 class G1CMOopClosure : public MetadataAwareOopClosure {
150 protected:
151 G1ConcurrentMark* _cm;
152 private:
153 G1CollectedHeap* _g1h;
154 G1CMTask* _task;
155 public:
156 G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task);
157 template <class T> void do_oop_nv(T* p);
158 virtual void do_oop( oop* p) { do_oop_nv(p); }
159 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
160 };
161
162 // Closure to scan the root regions during concurrent marking
163 class G1RootRegionScanClosure : public MetadataAwareOopClosure {
164 private:
165 G1CollectedHeap* _g1h;
166 G1ConcurrentMark* _cm;
167 public:
168 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) :
169 _g1h(g1h), _cm(cm) { }
170 template <class T> void do_oop_nv(T* p);
171 virtual void do_oop( oop* p) { do_oop_nv(p); }
172 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
173 };
174
175 class G1ConcurrentRefineOopClosure: public ExtendedOopClosure {
176 G1CollectedHeap* _g1;
177 uint _worker_i;
178
179 public:
180 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) :
181 _g1(g1h),
182 _worker_i(worker_i) {
183 }
184
185 // This closure needs special handling for InstanceRefKlass.
186 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
187
188 template <class T> void do_oop_nv(T* p);
189 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
190 virtual void do_oop(oop* p) { do_oop_nv(p); }
191 };
192
193 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP