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