1 /*
2 * Copyright (c) 2001, 2011, 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 OopsInGenClosure {
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 G1RemSet* _g1_rem;
52 ConcurrentMark* _cm;
53 G1ParScanThreadState* _par_scan_state;
54 public:
55 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
56 bool apply_to_weak_ref_discovered_field() { return true; }
57 };
58
59 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
60 public:
61 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
62 G1ParScanThreadState* par_scan_state,
63 ReferenceProcessor* rp) :
64 G1ParClosureSuper(g1, par_scan_state)
65 {
66 assert(_ref_processor == NULL, "sanity");
67 _ref_processor = rp;
68 }
69
70 template <class T> void do_oop_nv(T* p);
71 virtual void do_oop(oop* p) { do_oop_nv(p); }
72 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
73 };
74
75 class G1ParScanClosure : public G1ParClosureSuper {
76 public:
77 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
78 G1ParClosureSuper(g1, par_scan_state)
79 {
80 assert(_ref_processor == NULL, "sanity");
81 _ref_processor = rp;
82 }
83
84 template <class T> void do_oop_nv(T* p);
85 virtual void do_oop(oop* p) { do_oop_nv(p); }
86 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
87 };
88
89 #define G1_PARTIAL_ARRAY_MASK 0x2
90
91 template <class T> inline bool has_partial_array_mask(T* ref) {
92 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
93 }
94
95 template <class T> inline T* set_partial_array_mask(T obj) {
96 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
97 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
98 }
99
100 template <class T> inline oop clear_partial_array_mask(T* ref) {
101 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
102 }
103
104 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
105 G1ParScanClosure _scanner;
106
107 public:
108 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
109 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp)
110 {
111 assert(_ref_processor == NULL, "sanity");
112 }
113
114 G1ParScanClosure* scanner() {
115 return &_scanner;
116 }
117
118 template <class T> void do_oop_nv(T* p);
119 virtual void do_oop(oop* p) { do_oop_nv(p); }
120 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
121 };
122
123
124 class G1ParCopyHelper : public G1ParClosureSuper {
125 G1ParScanClosure *_scanner;
126 protected:
127 template <class T> void mark_forwardee(T* p);
128 oop copy_to_survivor_space(oop obj);
129
130 public:
131 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
132 G1ParScanClosure *scanner) :
133 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
134 };
135
136 template<bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee>
137 class G1ParCopyClosure : public G1ParCopyHelper {
138 G1ParScanClosure _scanner;
139
140 template <class T> void do_oop_work(T* p);
141
142 public:
143 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
144 ReferenceProcessor* rp) :
145 _scanner(g1, par_scan_state, rp),
146 G1ParCopyHelper(g1, par_scan_state, &_scanner)
147 {
148 assert(_ref_processor == NULL, "sanity");
149 }
150
151 G1ParScanClosure* scanner() { return &_scanner; }
152
153 template <class T> void do_oop_nv(T* p) {
154 do_oop_work(p);
155 if (do_mark_forwardee)
156 mark_forwardee(p);
157 }
158 virtual void do_oop(oop* p) { do_oop_nv(p); }
159 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
160 };
161
162 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
163 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure;
164
165 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
166 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure;
167
168 // The following closure types are no longer used but are retained
169 // for historical reasons:
170 // typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
171 // typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
172
173 // The following closure type is defined in g1_specialized_oop_closures.hpp:
174 //
175 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure;
176
177 // We use a separate closure to handle references during evacuation
178 // failure processing.
179 // We could have used another instance of G1ParScanHeapEvacClosure
180 // (since that closure no longer assumes that the references it
181 // handles point into the collection set).
182
183 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
184
185 class FilterIntoCSClosure: public OopClosure {
186 G1CollectedHeap* _g1;
187 OopClosure* _oc;
188 DirtyCardToOopClosure* _dcto_cl;
189 public:
190 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
191 G1CollectedHeap* g1,
192 OopClosure* oc,
193 ReferenceProcessor* rp) :
194 _dcto_cl(dcto_cl), _g1(g1), _oc(oc)
195 {
196 assert(_ref_processor == NULL, "sanity");
197 _ref_processor = rp;
198 }
199
200 template <class T> void do_oop_nv(T* p);
201 virtual void do_oop(oop* p) { do_oop_nv(p); }
202 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
203 bool apply_to_weak_ref_discovered_field() { return true; }
204 bool do_header() { return false; }
205 };
206
207 class FilterOutOfRegionClosure: public OopClosure {
208 HeapWord* _r_bottom;
209 HeapWord* _r_end;
210 OopClosure* _oc;
211 int _out_of_region;
212 public:
213 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
214 template <class T> void do_oop_nv(T* p);
215 virtual void do_oop(oop* p) { do_oop_nv(p); }
216 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
217 bool apply_to_weak_ref_discovered_field() { return true; }
218 bool do_header() { return false; }
219 int out_of_region() { return _out_of_region; }
220 };
221
222 // Closure for iterating over object fields during concurrent marking
223 class G1CMOopClosure : public OopClosure {
224 G1CollectedHeap* _g1h;
225 ConcurrentMark* _cm;
226 CMTask* _task;
227 public:
228 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
229 template <class T> void do_oop_nv(T* p);
230 virtual void do_oop( oop* p) { do_oop_nv(p); }
231 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
232 };
233
234 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP