1 /*
2 * Copyright (c) 2001, 2018, 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.
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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 BasicOopIterateClosure {
43 protected:
44 G1CollectedHeap* _g1h;
45 G1ParScanThreadState* _par_scan_state;
46 HeapRegion* _from;
47
48 G1ScanClosureBase(G1CollectedHeap* g1h, 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 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
58
59 void set_region(HeapRegion* from) { _from = from; }
60
61 inline void trim_queue_partially();
62 };
63
64 // Used during the Update RS phase to refine remaining cards in the DCQ during garbage collection.
65 class G1ScanObjsDuringUpdateRSClosure: public G1ScanClosureBase {
66 uint _worker_i;
67
68 public:
69 G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h,
70 G1ParScanThreadState* pss,
71 uint worker_i) :
72 G1ScanClosureBase(g1h, pss), _worker_i(worker_i) { }
73
74 template <class T> void do_oop_work(T* p);
75 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
76 virtual void do_oop(oop* p) { do_oop_work(p); }
77 };
78
79 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection.
80 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase {
81 public:
82 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1h,
83 G1ParScanThreadState* par_scan_state):
84 G1ScanClosureBase(g1h, par_scan_state) { }
85
86 template <class T> void do_oop_work(T* p);
87 virtual void do_oop(oop* p) { do_oop_work(p); }
88 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
89 };
90
91 // This closure is applied to the fields of the objects that have just been copied during evacuation.
92 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase {
93 public:
94 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
95 G1ScanClosureBase(g1h, par_scan_state) { }
96
97 template <class T> void do_oop_work(T* p);
98 virtual void do_oop(oop* p) { do_oop_work(p); }
99 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
100
101 // We need to do reference discovery while processing evacuated objects.
102 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
103
104 void set_ref_discoverer(ReferenceDiscoverer* rd) {
105 set_ref_discoverer_internal(rd);
106 }
107 };
108
109 // Add back base class for metadata
110 class G1ParCopyHelper : public OopClosure {
111 protected:
112 G1CollectedHeap* _g1h;
113 G1ParScanThreadState* _par_scan_state;
114 uint _worker_id; // Cache value from par_scan_state.
115 ClassLoaderData* _scanned_cld;
116 G1ConcurrentMark* _cm;
117
118 // Mark the object if it's not already marked. This is used to mark
119 // objects pointed to by roots that are guaranteed not to move
120 // during the GC (i.e., non-CSet objects). It is MT-safe.
121 inline void mark_object(oop obj);
122
123 // Mark the object if it's not already marked. This is used to mark
124 // objects pointed to by roots that have been forwarded during a
125 // GC. It is MT-safe.
126 inline void mark_forwarded_object(oop from_obj, oop to_obj);
127
128 G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state);
129 ~G1ParCopyHelper() { }
130
131 public:
132 void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; }
133 inline void do_cld_barrier(oop new_obj);
134
135 inline void trim_queue_partially();
136 };
137
138 enum G1Barrier {
139 G1BarrierNone,
140 G1BarrierCLD
141 };
142
143 enum G1Mark {
144 G1MarkNone,
145 G1MarkFromRoot,
146 G1MarkPromotedFromRoot
147 };
148
149 template <G1Barrier barrier, G1Mark do_mark_object>
150 class G1ParCopyClosure : public G1ParCopyHelper {
151 public:
152 G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
153 G1ParCopyHelper(g1h, par_scan_state) { }
154
155 template <class T> void do_oop_work(T* p);
156 virtual void do_oop(oop* p) { do_oop_work(p); }
157 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
158 };
159
160 class G1CLDScanClosure : public CLDClosure {
161 G1ParCopyHelper* _closure;
162 bool _process_only_dirty;
163 int _claim;
164 int _count;
165 public:
166 G1CLDScanClosure(G1ParCopyHelper* closure,
167 bool process_only_dirty, int claim_value)
168 : _closure(closure), _process_only_dirty(process_only_dirty), _claim(claim_value), _count(0) {}
169 void do_cld(ClassLoaderData* cld);
170 };
171
172 // Closure for iterating over object fields during concurrent marking
173 class G1CMOopClosure : public MetadataVisitingOopIterateClosure {
174 G1CollectedHeap* _g1h;
175 G1CMTask* _task;
176 public:
177 G1CMOopClosure(G1CollectedHeap* g1h,G1CMTask* task);
178 template <class T> void do_oop_work(T* p);
179 virtual void do_oop( oop* p) { do_oop_work(p); }
180 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
181 };
182
183 // Closure to scan the root regions during concurrent marking
184 class G1RootRegionScanClosure : public MetadataVisitingOopIterateClosure {
185 private:
186 G1CollectedHeap* _g1h;
187 G1ConcurrentMark* _cm;
188 uint _worker_id;
189 public:
190 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, uint worker_id) :
191 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
192 template <class T> void do_oop_work(T* p);
193 virtual void do_oop( oop* p) { do_oop_work(p); }
194 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
195 };
196
197 class G1ConcurrentRefineOopClosure: public BasicOopIterateClosure {
198 G1CollectedHeap* _g1h;
199 uint _worker_i;
200
201 public:
202 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) :
203 _g1h(g1h),
204 _worker_i(worker_i) {
205 }
206
207 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
208
209 template <class T> void do_oop_work(T* p);
210 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
211 virtual void do_oop(oop* p) { do_oop_work(p); }
212 };
213
214 class G1RebuildRemSetClosure : public BasicOopIterateClosure {
215 G1CollectedHeap* _g1h;
216 uint _worker_id;
217 public:
218 G1RebuildRemSetClosure(G1CollectedHeap* g1h, uint worker_id) : _g1h(g1h), _worker_id(worker_id) {
219 }
220
221 template <class T> void do_oop_work(T* p);
222 virtual void do_oop(oop* p) { do_oop_work(p); }
223 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
224
225 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
226 };
227
228 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP