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
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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 bool _has_refs_into_cset;
66
67 public:
68 G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h,
69 G1ParScanThreadState* pss,
70 uint worker_i) :
71 G1ScanClosureBase(g1h, pss), _has_refs_into_cset(false), _worker_i(worker_i) { }
72
73 void reset_has_refs_into_cset() { _has_refs_into_cset = false; }
74 bool has_refs_into_cset() const { return _has_refs_into_cset; }
75
76 template <class T> void do_oop_nv(T* p);
77 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
78 virtual void do_oop(oop* p) { do_oop_nv(p); }
79 };
80
81 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection.
82 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase {
83 public:
84 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1,
85 G1ParScanThreadState* par_scan_state):
86 G1ScanClosureBase(g1, par_scan_state) { }
87
88 template <class T> void do_oop_nv(T* p);
89 virtual void do_oop(oop* p) { do_oop_nv(p); }
90 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
91 };
92
93 // This closure is applied to the fields of the objects that have just been copied during evacuation.
94 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase {
95 public:
96 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
97 G1ScanClosureBase(g1, par_scan_state) { }
98
99 template <class T> void do_oop_nv(T* p);
100 virtual void do_oop(oop* p) { do_oop_nv(p); }
101 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
102
103 void set_ref_processor(ReferenceProcessor* rp) {
104 set_ref_processor_internal(rp);
105 }
106 };
107
108 // Add back base class for metadata
109 class G1ParCopyHelper : public OopClosure {
110 protected:
111 G1CollectedHeap* _g1;
112 G1ParScanThreadState* _par_scan_state;
113 uint _worker_id; // Cache value from par_scan_state.
114 Klass* _scanned_klass;
115 G1ConcurrentMark* _cm;
116
117 // Mark the object if it's not already marked. This is used to mark
118 // objects pointed to by roots that are guaranteed not to move
119 // during the GC (i.e., non-CSet objects). It is MT-safe.
120 inline void mark_object(oop obj);
121
122 // Mark the object if it's not already marked. This is used to mark
123 // objects pointed to by roots that have been forwarded during a
124 // GC. It is MT-safe.
125 inline void mark_forwarded_object(oop from_obj, oop to_obj);
126
127 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
128 ~G1ParCopyHelper() { }
129
130 public:
131 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
132 template <class T> inline void do_klass_barrier(T* p, oop new_obj);
133 };
134
135 enum G1Barrier {
136 G1BarrierNone,
137 G1BarrierKlass
138 };
139
140 enum G1Mark {
141 G1MarkNone,
142 G1MarkFromRoot,
143 G1MarkPromotedFromRoot
144 };
145
146 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext>
147 class G1ParCopyClosure : public G1ParCopyHelper {
148 public:
149 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
150 G1ParCopyHelper(g1, par_scan_state) { }
151
152 template <class T> void do_oop_work(T* p);
153 virtual void do_oop(oop* p) { do_oop_work(p); }
154 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
155 };
156
157 class G1KlassScanClosure : public KlassClosure {
158 G1ParCopyHelper* _closure;
159 bool _process_only_dirty;
160 int _count;
161 public:
162 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty)
163 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {}
164 void do_klass(Klass* klass);
165 };
166
167 // Closure for iterating over object fields during concurrent marking
168 class G1CMOopClosure : public MetadataAwareOopClosure {
169 protected:
170 G1ConcurrentMark* _cm;
171 private:
172 G1CollectedHeap* _g1h;
173 G1CMTask* _task;
174 public:
175 G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task);
176 template <class T> void do_oop_nv(T* p);
177 virtual void do_oop( oop* p) { do_oop_nv(p); }
178 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
179 };
180
181 // Closure to scan the root regions during concurrent marking
182 class G1RootRegionScanClosure : public MetadataAwareOopClosure {
183 private:
184 G1CollectedHeap* _g1h;
185 G1ConcurrentMark* _cm;
186 public:
187 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) :
188 _g1h(g1h), _cm(cm) { }
189 template <class T> void do_oop_nv(T* p);
190 virtual void do_oop( oop* p) { do_oop_nv(p); }
191 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
192 };
193
194 class G1ConcurrentRefineOopClosure: public ExtendedOopClosure {
195 G1CollectedHeap* _g1;
196 uint _worker_i;
197
198 public:
199 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) :
200 _g1(g1h),
201 _worker_i(worker_i) {
202 }
203
204 // This closure needs special handling for InstanceRefKlass.
205 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
206
207 template <class T> void do_oop_nv(T* p);
208 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
209 virtual void do_oop(oop* p) { do_oop_nv(p); }
210 };
211
212 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP