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.
22 *
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 // Initializes the instance, leaving _par_scan_state uninitialized. Must be done
55 // later using the set_par_scan_thread_state() method.
56 G1ParClosureSuper(G1CollectedHeap* g1);
57 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
58 bool apply_to_weak_ref_discovered_field() { return true; }
59
60 void set_par_scan_thread_state(G1ParScanThreadState* par_scan_state);
61 };
62
63 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
64 public:
65 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
66 G1ParScanThreadState* par_scan_state):
67 G1ParClosureSuper(g1, par_scan_state) { }
68
69 template <class T> void do_oop_nv(T* p);
70 virtual void do_oop(oop* p) { do_oop_nv(p); }
71 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
72 };
73
74 class G1ParScanClosure : public G1ParClosureSuper {
75 public:
76 G1ParScanClosure(G1CollectedHeap* g1, ReferenceProcessor* rp) :
77 G1ParClosureSuper(g1) {
78 assert(_ref_processor == NULL, "sanity");
79 _ref_processor = rp;
80 }
81
82 template <class T> void do_oop_nv(T* p);
83 virtual void do_oop(oop* p) { do_oop_nv(p); }
84 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
85 };
86
87 // Add back base class for metadata
88 class G1ParCopyHelper : public G1ParClosureSuper {
89 protected:
90 Klass* _scanned_klass;
91 ConcurrentMark* _cm;
92
93 // Mark the object if it's not already marked. This is used to mark
94 // objects pointed to by roots that are guaranteed not to move
95 // during the GC (i.e., non-CSet objects). It is MT-safe.
96 void mark_object(oop obj);
97
98 // Mark the object if it's not already marked. This is used to mark
99 // objects pointed to by roots that have been forwarded during a
100 // GC. It is MT-safe.
101 void mark_forwarded_object(oop from_obj, oop to_obj);
102 public:
103 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
104
105 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
106 template <class T> void do_klass_barrier(T* p, oop new_obj);
107 };
108
109 template <G1Barrier barrier, bool do_mark_object>
110 class G1ParCopyClosure : public G1ParCopyHelper {
111 private:
112 template <class T> void do_oop_work(T* p);
113
114 public:
115 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
116 ReferenceProcessor* rp) :
117 G1ParCopyHelper(g1, par_scan_state) {
118 assert(_ref_processor == NULL, "sanity");
119 }
120
121 template <class T> void do_oop_nv(T* p) { do_oop_work(p); }
122 virtual void do_oop(oop* p) { do_oop_nv(p); }
123 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
124 };
125
126 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure;
127 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure;
128
129
130 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
131 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure;
132
133 // We use a separate closure to handle references during evacuation
134 // failure processing.
135
136 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
137
138 class FilterIntoCSClosure: public ExtendedOopClosure {
139 G1CollectedHeap* _g1;
140 OopClosure* _oc;
141 DirtyCardToOopClosure* _dcto_cl;
142 public:
143 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
144 G1CollectedHeap* g1,
145 OopClosure* oc) :
146 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }
147
148 template <class T> void do_oop_nv(T* p);
149 virtual void do_oop(oop* p) { do_oop_nv(p); }
150 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
151 bool apply_to_weak_ref_discovered_field() { return true; }
152 };
153
154 class FilterOutOfRegionClosure: public ExtendedOopClosure {
155 HeapWord* _r_bottom;
156 HeapWord* _r_end;
157 OopClosure* _oc;
158 public:
159 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
160 template <class T> void do_oop_nv(T* p);
161 virtual void do_oop(oop* p) { do_oop_nv(p); }
162 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
163 bool apply_to_weak_ref_discovered_field() { return true; }
164 };
165
166 // Closure for iterating over object fields during concurrent marking
167 class G1CMOopClosure : public ExtendedOopClosure {
168 private:
169 G1CollectedHeap* _g1h;
170 ConcurrentMark* _cm;
171 CMTask* _task;
172 public:
173 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
174 template <class T> void do_oop_nv(T* p);
175 virtual void do_oop( oop* p) { do_oop_nv(p); }
176 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
177 };
178
179 // Closure to scan the root regions during concurrent marking
180 class G1RootRegionScanClosure : public ExtendedOopClosure {
181 private:
182 G1CollectedHeap* _g1h;
183 ConcurrentMark* _cm;
184 uint _worker_id;
185 public:
186 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,
187 uint worker_id) :
188 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
189 template <class T> void do_oop_nv(T* p);
190 virtual void do_oop( oop* p) { do_oop_nv(p); }
191 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
192 };
193
194 // Closure that applies the given two closures in sequence.
195 // Used by the RSet refinement code (when updating RSets
196 // during an evacuation pause) to record cards containing
197 // pointers into the collection set.
198
199 class G1Mux2Closure : public ExtendedOopClosure {
200 OopClosure* _c1;
201 OopClosure* _c2;
202 public:
203 G1Mux2Closure(OopClosure *c1, OopClosure *c2);
204 template <class T> void do_oop_nv(T* p);
205 virtual void do_oop(oop* p) { do_oop_nv(p); }
206 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
207 };
208
209 // A closure that returns true if it is actually applied
210 // to a reference
211
212 class G1TriggerClosure : public ExtendedOopClosure {
213 bool _triggered;
214 public:
215 G1TriggerClosure();
216 bool triggered() const { return _triggered; }
217 template <class T> void do_oop_nv(T* p);
218 virtual void do_oop(oop* p) { do_oop_nv(p); }
219 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
220 };
221
222 // A closure which uses a triggering closure to determine
223 // whether to apply an oop closure.
224
225 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {
226 G1TriggerClosure* _trigger_cl;
227 OopClosure* _oop_cl;
228 public:
229 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);
230 template <class T> void do_oop_nv(T* p);
231 virtual void do_oop(oop* p) { do_oop_nv(p); }
232 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
233 };
234
235 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
236 G1CollectedHeap* _g1;
237 G1RemSet* _g1_rem_set;
238 HeapRegion* _from;
239 OopsInHeapRegionClosure* _push_ref_cl;
240 bool _record_refs_into_cset;
241 uint _worker_i;
242
243 public:
244 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
245 G1RemSet* rs,
246 OopsInHeapRegionClosure* push_ref_cl,
247 bool record_refs_into_cset,
248 uint worker_i = 0);
249
250 void set_from(HeapRegion* from) {
251 assert(from != NULL, "from region must be non-NULL");
252 _from = from;
253 }
254
255 bool self_forwarded(oop obj) {
256 bool result = (obj->is_forwarded() && (obj->forwardee()== obj));
257 return result;
258 }
259
260 bool apply_to_weak_ref_discovered_field() { return true; }
261
262 template <class T> void do_oop_nv(T* p);
263 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
264 virtual void do_oop(oop* p) { do_oop_nv(p); }
265 };
266
267 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP