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
47 G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state);
48 ~G1ScanClosureBase() { }
49
50 template <class T>
51 inline void prefetch_and_push(T* p, oop const obj);
52
53 template <class T>
54 inline void handle_non_cset_obj_common(InCSetState const state, T* p, oop const obj);
55 public:
56 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
57
58 inline void trim_queue_partially();
59 };
60
61 // Used during the Update RS phase to refine remaining cards in the DCQ during garbage collection.
62 class G1ScanObjsDuringUpdateRSClosure : public G1ScanClosureBase {
63 public:
64 G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h,
65 G1ParScanThreadState* pss) :
66 G1ScanClosureBase(g1h, pss) { }
67
68 template <class T> void do_oop_work(T* p);
69 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
70 virtual void do_oop(oop* p) { do_oop_work(p); }
71 };
72
73 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection.
74 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase {
75 public:
76 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1h,
77 G1ParScanThreadState* par_scan_state):
78 G1ScanClosureBase(g1h, par_scan_state) { }
79
80 template <class T> void do_oop_work(T* p);
81 virtual void do_oop(oop* p) { do_oop_work(p); }
82 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
83 };
84
85 // This closure is applied to the fields of the objects that have just been copied during evacuation.
86 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase {
87 bool _scanning_in_young;
88
89 public:
90 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
91 G1ScanClosureBase(g1h, par_scan_state), _scanning_in_young(false) { }
92
93 void set_scanning_in_young(bool scanning_in_young) { _scanning_in_young = scanning_in_young; }
94
95 template <class T> void do_oop_work(T* p);
96 virtual void do_oop(oop* p) { do_oop_work(p); }
97 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
98
99 // We need to do reference discovery while processing evacuated objects.
100 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
101
102 void set_ref_discoverer(ReferenceDiscoverer* rd) {
103 set_ref_discoverer_internal(rd);
104 }
105 };
106
107 // Add back base class for metadata
108 class G1ParCopyHelper : public OopClosure {
109 protected:
110 G1CollectedHeap* _g1h;
111 G1ParScanThreadState* _par_scan_state;
112 uint _worker_id; // Cache value from par_scan_state.
113 ClassLoaderData* _scanned_cld;
114 G1ConcurrentMark* _cm;
115
116 // Mark the object if it's not already marked. This is used to mark
117 // objects pointed to by roots that are guaranteed not to move
118 // during the GC (i.e., non-CSet objects). It is MT-safe.
119 inline void mark_object(oop obj);
120
121 // Mark the object if it's not already marked. This is used to mark
122 // objects pointed to by roots that have been forwarded during a
123 // GC. It is MT-safe.
124 inline void mark_forwarded_object(oop from_obj, oop to_obj);
125
126 G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state);
127 ~G1ParCopyHelper() { }
128
129 public:
130 void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; }
131 inline void do_cld_barrier(oop new_obj);
132
133 inline void trim_queue_partially();
134 };
135
136 enum G1Barrier {
137 G1BarrierNone,
138 G1BarrierCLD
139 };
140
141 enum G1Mark {
142 G1MarkNone,
143 G1MarkFromRoot,
144 G1MarkPromotedFromRoot
145 };
146
147 template <G1Barrier barrier, G1Mark do_mark_object>
148 class G1ParCopyClosure : public G1ParCopyHelper {
149 public:
150 G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
151 G1ParCopyHelper(g1h, par_scan_state) { }
152
153 template <class T> void do_oop_work(T* p);
154 virtual void do_oop(oop* p) { do_oop_work(p); }
155 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
156 };
157
158 class G1CLDScanClosure : public CLDClosure {
159 G1ParCopyHelper* _closure;
160 bool _process_only_dirty;
161 int _claim;
162 int _count;
163 public:
164 G1CLDScanClosure(G1ParCopyHelper* closure,
165 bool process_only_dirty, int claim_value)
166 : _closure(closure), _process_only_dirty(process_only_dirty), _claim(claim_value), _count(0) {}
167 void do_cld(ClassLoaderData* cld);
168 };
169
170 // Closure for iterating over object fields during concurrent marking
171 class G1CMOopClosure : public MetadataVisitingOopIterateClosure {
172 G1CollectedHeap* _g1h;
173 G1CMTask* _task;
174 public:
175 G1CMOopClosure(G1CollectedHeap* g1h,G1CMTask* task);
176 template <class T> void do_oop_work(T* p);
177 virtual void do_oop( oop* p) { do_oop_work(p); }
178 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
179 };
180
181 // Closure to scan the root regions during concurrent marking
182 class G1RootRegionScanClosure : public MetadataVisitingOopIterateClosure {
183 private:
184 G1CollectedHeap* _g1h;
185 G1ConcurrentMark* _cm;
186 uint _worker_id;
187 public:
188 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, uint worker_id) :
189 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
190 template <class T> void do_oop_work(T* p);
191 virtual void do_oop( oop* p) { do_oop_work(p); }
192 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
193 };
194
195 class G1ConcurrentRefineOopClosure: public BasicOopIterateClosure {
196 G1CollectedHeap* _g1h;
197 uint _worker_i;
198
199 public:
200 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) :
201 _g1h(g1h),
202 _worker_i(worker_i) {
203 }
204
205 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
206
207 template <class T> void do_oop_work(T* p);
208 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
209 virtual void do_oop(oop* p) { do_oop_work(p); }
210 };
211
212 class G1RebuildRemSetClosure : public BasicOopIterateClosure {
213 G1CollectedHeap* _g1h;
214 uint _worker_id;
215 public:
216 G1RebuildRemSetClosure(G1CollectedHeap* g1h, uint worker_id) : _g1h(g1h), _worker_id(worker_id) {
217 }
218
219 template <class T> void do_oop_work(T* p);
220 virtual void do_oop(oop* p) { do_oop_work(p); }
221 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
222
223 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; }
224 };
225
226 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP