1 /*
2 * Copyright (c) 2001, 2014, 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_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP
27
28 class HeapRegion;
29 class G1CollectedHeap;
30 class G1RemSet;
31 class ConcurrentMark;
32 class DirtyCardToOopClosure;
33 class CMBitMap;
34 class CMMarkStack;
35 class G1ParScanThreadState;
36 class CMTask;
37 class ReferenceProcessor;
38
39 // A class that scans oops in a given heap region (much as OopsInGenClosure
40 // scans oops in a generation.)
41 class OopsInHeapRegionClosure: public ExtendedOopClosure {
42 protected:
43 HeapRegion* _from;
44 public:
45 void set_region(HeapRegion* from) { _from = from; }
46 };
47
48 class G1ParClosureSuper : public OopsInHeapRegionClosure {
49 protected:
50 G1CollectedHeap* _g1;
51 G1ParScanThreadState* _par_scan_state;
52 uint _worker_id;
53 public:
54 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
55 bool apply_to_weak_ref_discovered_field() { return true; }
56 };
57
58 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
59 public:
60 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
61 G1ParScanThreadState* par_scan_state):
62 G1ParClosureSuper(g1, par_scan_state) { }
63
64 template <class T> void do_oop_nv(T* p);
65 virtual void do_oop(oop* p) { do_oop_nv(p); }
66 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
67 };
68
69 class G1ParScanClosure : public G1ParClosureSuper {
70 public:
71 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
72 G1ParClosureSuper(g1, par_scan_state)
73 {
74 assert(_ref_processor == NULL, "sanity");
75 _ref_processor = rp;
76 }
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
83 // Add back base class for metadata
84 class G1ParCopyHelper : public G1ParClosureSuper {
85 protected:
86 Klass* _scanned_klass;
87 ConcurrentMark* _cm;
88
89 // Mark the object if it's not already marked. This is used to mark
90 // objects pointed to by roots that are guaranteed not to move
91 // during the GC (i.e., non-CSet objects). It is MT-safe.
92 void mark_object(oop obj);
93
94 // Mark the object if it's not already marked. This is used to mark
95 // objects pointed to by roots that have been forwarded during a
96 // GC. It is MT-safe.
97 void mark_forwarded_object(oop from_obj, oop to_obj);
98 public:
99 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
100
101 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
102 template <class T> void do_klass_barrier(T* p, oop new_obj);
103 };
104
105 template <G1Barrier barrier, bool do_mark_object>
106 class G1ParCopyClosure : public G1ParCopyHelper {
107 G1ParScanClosure _scanner;
108 template <class T> void do_oop_work(T* p);
109
110 protected:
111 oop copy_to_survivor_space(oop obj);
112
113 public:
114 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
115 ReferenceProcessor* rp) :
116 _scanner(g1, par_scan_state, rp),
117 G1ParCopyHelper(g1, par_scan_state) {
118 assert(_ref_processor == NULL, "sanity");
119 }
120
121 G1ParScanClosure* scanner() { return &_scanner; }
122
123 template <class T> void do_oop_nv(T* p) { do_oop_work(p); }
124 virtual void do_oop(oop* p) { do_oop_nv(p); }
125 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
126 };
127
128 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure;
129 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure;
130
131
132 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
133 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure;
134
135 // We use a separate closure to handle references during evacuation
136 // failure processing.
137
138 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
139
140 class FilterIntoCSClosure: public ExtendedOopClosure {
141 G1CollectedHeap* _g1;
142 OopClosure* _oc;
143 DirtyCardToOopClosure* _dcto_cl;
144 public:
145 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
146 G1CollectedHeap* g1,
147 OopClosure* oc) :
148 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }
149
150 template <class T> void do_oop_nv(T* p);
151 virtual void do_oop(oop* p) { do_oop_nv(p); }
152 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
153 bool apply_to_weak_ref_discovered_field() { return true; }
154 };
155
156 class FilterOutOfRegionClosure: public ExtendedOopClosure {
157 HeapWord* _r_bottom;
158 HeapWord* _r_end;
159 OopClosure* _oc;
160 public:
161 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
162 template <class T> void do_oop_nv(T* p);
163 virtual void do_oop(oop* p) { do_oop_nv(p); }
164 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
165 bool apply_to_weak_ref_discovered_field() { return true; }
166 };
167
168 // Closure for iterating over object fields during concurrent marking
169 class G1CMOopClosure : public ExtendedOopClosure {
170 private:
171 G1CollectedHeap* _g1h;
172 ConcurrentMark* _cm;
173 CMTask* _task;
174 public:
175 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* 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 ExtendedOopClosure {
183 private:
184 G1CollectedHeap* _g1h;
185 ConcurrentMark* _cm;
186 uint _worker_id;
187 public:
188 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,
189 uint worker_id) :
190 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
191 template <class T> void do_oop_nv(T* p);
192 virtual void do_oop( oop* p) { do_oop_nv(p); }
193 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
194 };
195
196 // Closure that applies the given two closures in sequence.
197 // Used by the RSet refinement code (when updating RSets
198 // during an evacuation pause) to record cards containing
199 // pointers into the collection set.
200
201 class G1Mux2Closure : public ExtendedOopClosure {
202 OopClosure* _c1;
203 OopClosure* _c2;
204 public:
205 G1Mux2Closure(OopClosure *c1, OopClosure *c2);
206 template <class T> void do_oop_nv(T* p);
207 virtual void do_oop(oop* p) { do_oop_nv(p); }
208 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
209 };
210
211 // A closure that returns true if it is actually applied
212 // to a reference
213
214 class G1TriggerClosure : public ExtendedOopClosure {
215 bool _triggered;
216 public:
217 G1TriggerClosure();
218 bool triggered() const { return _triggered; }
219 template <class T> void do_oop_nv(T* p);
220 virtual void do_oop(oop* p) { do_oop_nv(p); }
221 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
222 };
223
224 // A closure which uses a triggering closure to determine
225 // whether to apply an oop closure.
226
227 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {
228 G1TriggerClosure* _trigger_cl;
229 OopClosure* _oop_cl;
230 public:
231 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);
232 template <class T> void do_oop_nv(T* p);
233 virtual void do_oop(oop* p) { do_oop_nv(p); }
234 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
235 };
236
237 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
238 G1CollectedHeap* _g1;
239 G1RemSet* _g1_rem_set;
240 HeapRegion* _from;
241 OopsInHeapRegionClosure* _push_ref_cl;
242 bool _record_refs_into_cset;
243 int _worker_i;
244
245 public:
246 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
247 G1RemSet* rs,
248 OopsInHeapRegionClosure* push_ref_cl,
249 bool record_refs_into_cset,
250 int worker_i = 0);
251
252 void set_from(HeapRegion* from) {
253 assert(from != NULL, "from region must be non-NULL");
254 _from = from;
255 }
256
257 bool self_forwarded(oop obj) {
258 bool result = (obj->is_forwarded() && (obj->forwardee()== obj));
259 return result;
260 }
261
262 bool apply_to_weak_ref_discovered_field() { return true; }
263
264 template <class T> void do_oop_nv(T* p);
265 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
266 virtual void do_oop(oop* p) { do_oop_nv(p); }
267 };
268
269 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP