1 /*
2 * Copyright (c) 2001, 2010, 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
37 // A class that scans oops in a given heap region (much as OopsInGenClosure
38 // scans oops in a generation.)
39 class OopsInHeapRegionClosure: public OopsInGenClosure {
40 protected:
41 HeapRegion* _from;
42 public:
43 virtual void set_region(HeapRegion* from) { _from = from; }
44 };
45
46 class G1ParClosureSuper : public OopsInHeapRegionClosure {
47 protected:
48 G1CollectedHeap* _g1;
49 G1RemSet* _g1_rem;
50 ConcurrentMark* _cm;
51 G1ParScanThreadState* _par_scan_state;
52 public:
53 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
54 bool apply_to_weak_ref_discovered_field() { return true; }
55 };
56
57 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
58 public:
59 G1ParPushHeapRSClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
60 G1ParClosureSuper(g1, par_scan_state) { }
61 template <class T> void do_oop_nv(T* p);
62 virtual void do_oop(oop* p) { do_oop_nv(p); }
63 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
64 };
65
66 class G1ParScanClosure : public G1ParClosureSuper {
67 public:
68 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
69 G1ParClosureSuper(g1, par_scan_state) { }
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 #define G1_PARTIAL_ARRAY_MASK 0x2
76
77 template <class T> inline bool has_partial_array_mask(T* ref) {
78 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
79 }
80
81 template <class T> inline T* set_partial_array_mask(T obj) {
82 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
83 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
84 }
85
86 template <class T> inline oop clear_partial_array_mask(T* ref) {
87 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
88 }
89
90 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
91 G1ParScanClosure _scanner;
92 public:
93 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
94 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state) { }
95 template <class T> void do_oop_nv(T* p);
96 virtual void do_oop(oop* p) { do_oop_nv(p); }
97 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
98 };
99
100
101 class G1ParCopyHelper : public G1ParClosureSuper {
102 G1ParScanClosure *_scanner;
103 protected:
104 template <class T> void mark_forwardee(T* p);
105 oop copy_to_survivor_space(oop obj);
106 public:
107 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
108 G1ParScanClosure *scanner) :
109 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
110 };
111
112 template<bool do_gen_barrier, G1Barrier barrier,
113 bool do_mark_forwardee>
114 class G1ParCopyClosure : public G1ParCopyHelper {
115 G1ParScanClosure _scanner;
116 template <class T> void do_oop_work(T* p);
117 public:
118 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
119 _scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { }
120 template <class T> void do_oop_nv(T* p) {
121 do_oop_work(p);
122 if (do_mark_forwardee)
123 mark_forwardee(p);
124 }
125 virtual void do_oop(oop* p) { do_oop_nv(p); }
126 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
127 };
128
129 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
130 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure;
131 typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
132 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
133 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure;
134 typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
135
136 // This is the only case when we set skip_cset_test. Basically, this
137 // closure is (should?) only be called directly while we're draining
138 // the overflow and task queues. In that case we know that the
139 // reference in question points into the collection set, otherwise we
140 // would not have pushed it on the queue. The following is defined in
141 // g1_specialized_oop_closures.hpp.
142 // typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
143 // We need a separate closure to handle references during evacuation
144 // failure processing, as we cannot asume that the reference already
145 // points into the collection set (like G1ParScanHeapEvacClosure does).
146 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
147
148 class FilterIntoCSClosure: public OopClosure {
149 G1CollectedHeap* _g1;
150 OopClosure* _oc;
151 DirtyCardToOopClosure* _dcto_cl;
152 public:
153 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
154 G1CollectedHeap* g1, OopClosure* oc) :
155 _dcto_cl(dcto_cl), _g1(g1), _oc(oc)
156 {}
157 template <class T> void do_oop_nv(T* p);
158 virtual void do_oop(oop* p) { do_oop_nv(p); }
159 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
160 bool apply_to_weak_ref_discovered_field() { return true; }
161 bool do_header() { return false; }
162 };
163
164 class FilterInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
165 G1CollectedHeap* _g1;
166 OopsInHeapRegionClosure* _oc;
167 public:
168 FilterInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
169 OopsInHeapRegionClosure* oc) :
170 _g1(g1), _oc(oc)
171 {}
172 template <class T> void do_oop_nv(T* p);
173 virtual void do_oop(oop* p) { do_oop_nv(p); }
174 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
175 bool apply_to_weak_ref_discovered_field() { return true; }
176 bool do_header() { return false; }
177 void set_region(HeapRegion* from) {
178 _oc->set_region(from);
179 }
180 };
181
182 class FilterAndMarkInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
183 G1CollectedHeap* _g1;
184 ConcurrentMark* _cm;
185 OopsInHeapRegionClosure* _oc;
186 public:
187 FilterAndMarkInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
188 OopsInHeapRegionClosure* oc,
189 ConcurrentMark* cm)
190 : _g1(g1), _oc(oc), _cm(cm) { }
191
192 template <class T> void do_oop_nv(T* p);
193 virtual void do_oop(oop* p) { do_oop_nv(p); }
194 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
195 bool apply_to_weak_ref_discovered_field() { return true; }
196 bool do_header() { return false; }
197 void set_region(HeapRegion* from) {
198 _oc->set_region(from);
199 }
200 };
201
202 class FilterOutOfRegionClosure: public OopClosure {
203 HeapWord* _r_bottom;
204 HeapWord* _r_end;
205 OopClosure* _oc;
206 int _out_of_region;
207 public:
208 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
209 template <class T> void do_oop_nv(T* p);
210 virtual void do_oop(oop* p) { do_oop_nv(p); }
211 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
212 bool apply_to_weak_ref_discovered_field() { return true; }
213 bool do_header() { return false; }
214 int out_of_region() { return _out_of_region; }
215 };
216
217 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP