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annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 3932:b0efc7ee3b31
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Reviewed-by: jrose, never
author | twisti |
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date | Thu, 08 Sep 2011 05:11:31 -0700 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP | |
27 | |
342 | 28 class HeapRegion; |
29 class G1CollectedHeap; | |
30 class G1RemSet; | |
31 class ConcurrentMark; | |
32 class DirtyCardToOopClosure; | |
33 class CMBitMap; | |
34 class CMMarkStack; | |
35 class G1ParScanThreadState; | |
3771 | 36 class CMTask; |
342 | 37 |
38 // A class that scans oops in a given heap region (much as OopsInGenClosure | |
39 // scans oops in a generation.) | |
40 class OopsInHeapRegionClosure: public OopsInGenClosure { | |
41 protected: | |
42 HeapRegion* _from; | |
43 public: | |
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44 void set_region(HeapRegion* from) { _from = from; } |
342 | 45 }; |
46 | |
47 class G1ParClosureSuper : public OopsInHeapRegionClosure { | |
48 protected: | |
49 G1CollectedHeap* _g1; | |
50 G1RemSet* _g1_rem; | |
51 ConcurrentMark* _cm; | |
52 G1ParScanThreadState* _par_scan_state; | |
53 public: | |
54 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); | |
55 bool apply_to_weak_ref_discovered_field() { return true; } | |
56 }; | |
57 | |
1261 | 58 class G1ParPushHeapRSClosure : public G1ParClosureSuper { |
59 public: | |
60 G1ParPushHeapRSClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
61 G1ParClosureSuper(g1, par_scan_state) { } | |
62 template <class T> void do_oop_nv(T* p); | |
63 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
64 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
65 }; | |
66 | |
342 | 67 class G1ParScanClosure : public G1ParClosureSuper { |
68 public: | |
69 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
70 G1ParClosureSuper(g1, par_scan_state) { } | |
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71 template <class T> void do_oop_nv(T* p); |
342 | 72 virtual void do_oop(oop* p) { do_oop_nv(p); } |
73 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
74 }; | |
75 | |
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76 #define G1_PARTIAL_ARRAY_MASK 0x2 |
342 | 77 |
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78 template <class T> inline bool has_partial_array_mask(T* ref) { |
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79 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; |
526 | 80 } |
81 | |
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82 template <class T> inline T* set_partial_array_mask(T obj) { |
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83 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); |
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84 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK); |
526 | 85 } |
86 | |
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87 template <class T> inline oop clear_partial_array_mask(T* ref) { |
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88 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); |
526 | 89 } |
90 | |
342 | 91 class G1ParScanPartialArrayClosure : public G1ParClosureSuper { |
92 G1ParScanClosure _scanner; | |
93 public: | |
94 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
95 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state) { } | |
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96 template <class T> void do_oop_nv(T* p); |
342 | 97 virtual void do_oop(oop* p) { do_oop_nv(p); } |
98 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
99 }; | |
100 | |
101 | |
102 class G1ParCopyHelper : public G1ParClosureSuper { | |
103 G1ParScanClosure *_scanner; | |
104 protected: | |
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105 template <class T> void mark_forwardee(T* p); |
342 | 106 oop copy_to_survivor_space(oop obj); |
107 public: | |
108 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, | |
109 G1ParScanClosure *scanner) : | |
110 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { } | |
111 }; | |
112 | |
526 | 113 template<bool do_gen_barrier, G1Barrier barrier, |
1261 | 114 bool do_mark_forwardee> |
342 | 115 class G1ParCopyClosure : public G1ParCopyHelper { |
116 G1ParScanClosure _scanner; | |
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117 template <class T> void do_oop_work(T* p); |
342 | 118 public: |
119 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : | |
120 _scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { } | |
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121 template <class T> void do_oop_nv(T* p) { |
342 | 122 do_oop_work(p); |
123 if (do_mark_forwardee) | |
124 mark_forwardee(p); | |
125 } | |
126 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
127 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
128 }; | |
129 | |
1261 | 130 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure; |
131 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure; | |
132 typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure; | |
133 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; | |
134 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure; | |
135 typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure; | |
136 | |
526 | 137 // This is the only case when we set skip_cset_test. Basically, this |
138 // closure is (should?) only be called directly while we're draining | |
139 // the overflow and task queues. In that case we know that the | |
140 // reference in question points into the collection set, otherwise we | |
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141 // would not have pushed it on the queue. The following is defined in |
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142 // g1_specialized_oop_closures.hpp. |
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143 // typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure; |
526 | 144 // We need a separate closure to handle references during evacuation |
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145 // failure processing, as we cannot asume that the reference already |
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146 // points into the collection set (like G1ParScanHeapEvacClosure does). |
1261 | 147 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; |
342 | 148 |
149 class FilterIntoCSClosure: public OopClosure { | |
150 G1CollectedHeap* _g1; | |
151 OopClosure* _oc; | |
152 DirtyCardToOopClosure* _dcto_cl; | |
153 public: | |
154 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, | |
155 G1CollectedHeap* g1, OopClosure* oc) : | |
156 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) | |
157 {} | |
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158 template <class T> void do_oop_nv(T* p); |
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159 virtual void do_oop(oop* p) { do_oop_nv(p); } |
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160 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 161 bool apply_to_weak_ref_discovered_field() { return true; } |
162 bool do_header() { return false; } | |
163 }; | |
164 | |
165 class FilterOutOfRegionClosure: public OopClosure { | |
166 HeapWord* _r_bottom; | |
167 HeapWord* _r_end; | |
168 OopClosure* _oc; | |
169 int _out_of_region; | |
170 public: | |
171 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); | |
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172 template <class T> void do_oop_nv(T* p); |
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173 virtual void do_oop(oop* p) { do_oop_nv(p); } |
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174 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 175 bool apply_to_weak_ref_discovered_field() { return true; } |
176 bool do_header() { return false; } | |
177 int out_of_region() { return _out_of_region; } | |
178 }; | |
1972 | 179 |
3771 | 180 // Closure for iterating over object fields during concurrent marking |
181 class G1CMOopClosure : public OopClosure { | |
182 G1CollectedHeap* _g1h; | |
183 ConcurrentMark* _cm; | |
184 CMTask* _task; | |
185 public: | |
186 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); | |
187 template <class T> void do_oop_nv(T* p); | |
188 virtual void do_oop( oop* p) { do_oop_nv(p); } | |
189 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
190 }; | |
191 | |
1972 | 192 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP |