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 "memory/iterator.hpp"
29 #include "oops/markOop.hpp"
30
31 class HeapRegion;
32 class G1CollectedHeap;
33 class G1RemSet;
34 class G1ConcurrentMark;
35 class DirtyCardToOopClosure;
36 class G1CMBitMap;
37 class G1ParScanThreadState;
38 class G1CMTask;
39 class ReferenceProcessor;
40
41 // A class that scans oops in a given heap region (much as OopsInGenClosure
42 // scans oops in a generation.)
43 class OopsInHeapRegionClosure: public ExtendedOopClosure {
44 protected:
45 HeapRegion* _from;
46 public:
47 void set_region(HeapRegion* from) { _from = from; }
48 };
49
50 class G1ParClosureSuper : public OopsInHeapRegionClosure {
51 protected:
52 G1CollectedHeap* _g1;
53 G1ParScanThreadState* _par_scan_state;
54
55 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
56 ~G1ParClosureSuper() { }
57
58 public:
59 virtual bool apply_to_weak_ref_discovered_field() { return true; }
60 };
61
62 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
63 public:
64 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
65 G1ParScanThreadState* par_scan_state):
66 G1ParClosureSuper(g1, par_scan_state) { }
67
68 template <class T> void do_oop_nv(T* p);
69 virtual void do_oop(oop* p) { do_oop_nv(p); }
70 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
71 };
72
73 class G1ParScanClosure : public G1ParClosureSuper {
74 public:
75 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
76 G1ParClosureSuper(g1, par_scan_state) { }
77
78 template <class T> void do_oop_nv(T* p);
79 virtual void do_oop(oop* p) { do_oop_nv(p); }
80 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
81
82 void set_ref_processor(ReferenceProcessor* rp) {
83 set_ref_processor_internal(rp);
84 }
85 };
86
87 // Add back base class for metadata
88 class G1ParCopyHelper : public OopClosure {
89 protected:
90 G1CollectedHeap* _g1;
91 G1ParScanThreadState* _par_scan_state;
92 uint _worker_id; // Cache value from par_scan_state.
93 Klass* _scanned_klass;
94 G1ConcurrentMark* _cm;
95
96 // Mark the object if it's not already marked. This is used to mark
97 // objects pointed to by roots that are guaranteed not to move
98 // during the GC (i.e., non-CSet objects). It is MT-safe.
99 inline void mark_object(oop obj);
100
101 // Mark the object if it's not already marked. This is used to mark
102 // objects pointed to by roots that have been forwarded during a
103 // GC. It is MT-safe.
104 inline void mark_forwarded_object(oop from_obj, oop to_obj);
105
106 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
107 ~G1ParCopyHelper() { }
108
109 public:
110 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
111 template <class T> inline void do_klass_barrier(T* p, oop new_obj);
112 };
113
114 enum G1Barrier {
115 G1BarrierNone,
116 G1BarrierKlass
117 };
118
119 enum G1Mark {
120 G1MarkNone,
121 G1MarkFromRoot,
122 G1MarkPromotedFromRoot
123 };
124
125 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext>
126 class G1ParCopyClosure : public G1ParCopyHelper {
127 public:
128 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
129 G1ParCopyHelper(g1, par_scan_state) { }
130
131 template <class T> void do_oop_work(T* p);
132 virtual void do_oop(oop* p) { do_oop_work(p); }
133 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
134 };
135
136 class G1KlassScanClosure : public KlassClosure {
137 G1ParCopyHelper* _closure;
138 bool _process_only_dirty;
139 int _count;
140 public:
141 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty)
142 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {}
143 void do_klass(Klass* klass);
144 };
145
146 // Closure for iterating over object fields during concurrent marking
147 class G1CMOopClosure : public MetadataAwareOopClosure {
148 protected:
149 G1ConcurrentMark* _cm;
150 private:
151 G1CollectedHeap* _g1h;
152 G1CMTask* _task;
153 public:
154 G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task);
155 template <class T> void do_oop_nv(T* p);
156 virtual void do_oop( oop* p) { do_oop_nv(p); }
157 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
158 };
159
160 // Closure to scan the root regions during concurrent marking
161 class G1RootRegionScanClosure : public MetadataAwareOopClosure {
162 private:
163 G1CollectedHeap* _g1h;
164 G1ConcurrentMark* _cm;
165 public:
166 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) :
167 _g1h(g1h), _cm(cm) { }
168 template <class T> void do_oop_nv(T* p);
169 virtual void do_oop( oop* p) { do_oop_nv(p); }
170 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
171 };
172
173 class G1ConcurrentRefineOopClosure: public ExtendedOopClosure {
174 G1CollectedHeap* _g1;
175 uint _worker_i;
176
177 public:
178 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) :
179 _g1(g1h),
180 _worker_i(worker_i) {
181 }
182
183 bool apply_to_weak_ref_discovered_field() { return true; }
184
185 template <class T> void do_oop_nv(T* p);
186 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
187 virtual void do_oop(oop* p) { do_oop_nv(p); }
188 };
189
190 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
191 G1CollectedHeap* _g1;
192 HeapRegion* _from;
193 G1ParPushHeapRSClosure* _push_ref_cl;
194 bool _record_refs_into_cset;
195 uint _worker_i;
196 bool _has_refs_into_cset;
197
198 public:
199 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
200 G1ParPushHeapRSClosure* push_ref_cl,
201 bool record_refs_into_cset,
202 uint worker_i);
203
204 void set_from(HeapRegion* from) {
205 assert(from != NULL, "from region must be non-NULL");
206 _from = from;
207 }
208
209 bool apply_to_weak_ref_discovered_field() { return true; }
210
211 bool self_forwarded(oop obj) {
212 markOop m = obj->mark();
213 bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj));
214 return result;
215 }
216
217 bool has_refs_into_cset() const { return _has_refs_into_cset; }
218
219 template <class T> inline void do_oop_nv(T* p);
220 virtual inline void do_oop(narrowOop* p);
221 virtual inline void do_oop(oop* p);
222 };
223
224 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP