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 HRInto_G1RemSet;
32 class G1RemSet;
33 class ConcurrentMark;
34 class DirtyCardToOopClosure;
35 class CMBitMap;
36 class CMMarkStack;
37 class G1ParScanThreadState;
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 virtual 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, G1ParScanThreadState* par_scan_state) :
62 G1ParClosureSuper(g1, par_scan_state) { }
63 template <class T> void do_oop_nv(T* p);
64 virtual void do_oop(oop* p) { do_oop_nv(p); }
65 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
66 };
67
68 class G1ParScanClosure : public G1ParClosureSuper {
69 public:
70 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
71 G1ParClosureSuper(g1, par_scan_state) { }
72 template <class T> void do_oop_nv(T* p);
73 virtual void do_oop(oop* p) { do_oop_nv(p); }
74 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
75 };
76
77 #define G1_PARTIAL_ARRAY_MASK 0x2
78
79 template <class T> inline bool has_partial_array_mask(T* ref) {
80 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
81 }
82
83 template <class T> inline T* set_partial_array_mask(T obj) {
84 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
85 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
86 }
87
88 template <class T> inline oop clear_partial_array_mask(T* ref) {
89 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
90 }
91
92 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
93 G1ParScanClosure _scanner;
94 public:
95 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
96 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state) { }
97 template <class T> void do_oop_nv(T* p);
98 virtual void do_oop(oop* p) { do_oop_nv(p); }
99 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
100 };
101
102
103 class G1ParCopyHelper : public G1ParClosureSuper {
104 G1ParScanClosure *_scanner;
105 protected:
106 template <class T> void mark_forwardee(T* p);
107 oop copy_to_survivor_space(oop obj);
108 public:
109 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
110 G1ParScanClosure *scanner) :
111 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
112 };
113
114 template<bool do_gen_barrier, G1Barrier barrier,
115 bool do_mark_forwardee>
116 class G1ParCopyClosure : public G1ParCopyHelper {
117 G1ParScanClosure _scanner;
118 template <class T> void do_oop_work(T* p);
119 public:
120 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
121 _scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { }
122 template <class T> void do_oop_nv(T* p) {
123 do_oop_work(p);
124 if (do_mark_forwardee)
125 mark_forwardee(p);
126 }
127 virtual void do_oop(oop* p) { do_oop_nv(p); }
128 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
129 };
130
131 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
132 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure;
133 typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
134 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
135 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure;
136 typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
137
138 // This is the only case when we set skip_cset_test. Basically, this
139 // closure is (should?) only be called directly while we're draining
140 // the overflow and task queues. In that case we know that the
141 // reference in question points into the collection set, otherwise we
142 // would not have pushed it on the queue. The following is defined in
143 // g1_specialized_oop_closures.hpp.
144 // typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
145 // We need a separate closure to handle references during evacuation
146 // failure processing, as we cannot asume that the reference already
147 // points into the collection set (like G1ParScanHeapEvacClosure does).
148 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
149
150 class FilterIntoCSClosure: public OopClosure {
151 G1CollectedHeap* _g1;
152 OopClosure* _oc;
153 DirtyCardToOopClosure* _dcto_cl;
154 public:
155 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
156 G1CollectedHeap* g1, OopClosure* oc) :
157 _dcto_cl(dcto_cl), _g1(g1), _oc(oc)
158 {}
159 template <class T> void do_oop_nv(T* p);
160 virtual void do_oop(oop* p) { do_oop_nv(p); }
161 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
162 bool apply_to_weak_ref_discovered_field() { return true; }
163 bool do_header() { return false; }
164 };
165
166 class FilterInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
167 G1CollectedHeap* _g1;
168 OopsInHeapRegionClosure* _oc;
169 public:
170 FilterInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
171 OopsInHeapRegionClosure* oc) :
172 _g1(g1), _oc(oc)
173 {}
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 bool apply_to_weak_ref_discovered_field() { return true; }
178 bool do_header() { return false; }
179 void set_region(HeapRegion* from) {
180 _oc->set_region(from);
181 }
182 };
183
184 class FilterAndMarkInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
185 G1CollectedHeap* _g1;
186 ConcurrentMark* _cm;
187 OopsInHeapRegionClosure* _oc;
188 public:
189 FilterAndMarkInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
190 OopsInHeapRegionClosure* oc,
191 ConcurrentMark* cm)
192 : _g1(g1), _oc(oc), _cm(cm) { }
193
194 template <class T> void do_oop_nv(T* p);
195 virtual void do_oop(oop* p) { do_oop_nv(p); }
196 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
197 bool apply_to_weak_ref_discovered_field() { return true; }
198 bool do_header() { return false; }
199 void set_region(HeapRegion* from) {
200 _oc->set_region(from);
201 }
202 };
203
204 class FilterOutOfRegionClosure: public OopClosure {
205 HeapWord* _r_bottom;
206 HeapWord* _r_end;
207 OopClosure* _oc;
208 int _out_of_region;
209 public:
210 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
211 template <class T> void do_oop_nv(T* p);
212 virtual void do_oop(oop* p) { do_oop_nv(p); }
213 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
214 bool apply_to_weak_ref_discovered_field() { return true; }
215 bool do_header() { return false; }
216 int out_of_region() { return _out_of_region; }
217 };
218
219 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP