Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp @ 20413:91cb3b8aac2b
8048879: "unexpected yanked node" opto/postaloc.cpp:139
Summary: MemBarAcquireNode prevents deletion of dead LoadNNode. Added condition to 'has_special_unique_user' to trigger deletion.
Reviewed-by: kvn, iveresov
author | thartmann |
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date | Tue, 19 Aug 2014 07:36:11 +0200 |
parents | 4c1b88a53c74 |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP | |
27 | |
28 #include "memory/genOopClosures.hpp" | |
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29 #include "memory/iterator.hpp" |
1972 | 30 |
0 | 31 ///////////////////////////////////////////////////////////////// |
32 // Closures used by ConcurrentMarkSweepGeneration's collector | |
33 ///////////////////////////////////////////////////////////////// | |
34 class ConcurrentMarkSweepGeneration; | |
35 class CMSBitMap; | |
36 class CMSMarkStack; | |
37 class CMSCollector; | |
38 class MarkFromRootsClosure; | |
39 class Par_MarkFromRootsClosure; | |
40 | |
113
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41 // Decode the oop and call do_oop on it. |
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42 #define DO_OOP_WORK_DEFN \ |
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43 void do_oop(oop obj); \ |
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44 template <class T> inline void do_oop_work(T* p) { \ |
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45 T heap_oop = oopDesc::load_heap_oop(p); \ |
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46 if (!oopDesc::is_null(heap_oop)) { \ |
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47 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); \ |
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48 do_oop(obj); \ |
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49 } \ |
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50 } |
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51 |
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52 // TODO: This duplication of the MetadataAwareOopClosure class is only needed |
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53 // because some CMS OopClosures derive from OopsInGenClosure. It would be |
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54 // good to get rid of them completely. |
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55 class MetadataAwareOopsInGenClosure: public OopsInGenClosure { |
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56 KlassToOopClosure _klass_closure; |
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57 public: |
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58 MetadataAwareOopsInGenClosure() { |
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59 _klass_closure.initialize(this); |
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60 } |
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61 |
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62 virtual bool do_metadata() { return do_metadata_nv(); } |
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63 inline bool do_metadata_nv() { return true; } |
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64 |
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65 virtual void do_klass(Klass* k); |
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66 void do_klass_nv(Klass* k); |
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67 |
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68 virtual void do_class_loader_data(ClassLoaderData* cld); |
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69 }; |
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70 |
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71 class MarkRefsIntoClosure: public MetadataAwareOopsInGenClosure { |
113
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72 private: |
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73 const MemRegion _span; |
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74 CMSBitMap* _bitMap; |
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75 protected: |
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76 DO_OOP_WORK_DEFN |
0 | 77 public: |
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78 MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); |
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79 virtual void do_oop(oop* p); |
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80 virtual void do_oop(narrowOop* p); |
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81 |
0 | 82 Prefetch::style prefetch_style() { |
83 return Prefetch::do_read; | |
84 } | |
85 }; | |
86 | |
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87 class Par_MarkRefsIntoClosure: public MetadataAwareOopsInGenClosure { |
11975 | 88 private: |
89 const MemRegion _span; | |
90 CMSBitMap* _bitMap; | |
91 protected: | |
92 DO_OOP_WORK_DEFN | |
93 public: | |
94 Par_MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); | |
95 virtual void do_oop(oop* p); | |
96 virtual void do_oop(narrowOop* p); | |
97 | |
98 Prefetch::style prefetch_style() { | |
99 return Prefetch::do_read; | |
100 } | |
101 }; | |
102 | |
0 | 103 // A variant of the above used in certain kinds of CMS |
104 // marking verification. | |
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105 class MarkRefsIntoVerifyClosure: public MetadataAwareOopsInGenClosure { |
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106 private: |
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107 const MemRegion _span; |
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108 CMSBitMap* _verification_bm; |
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109 CMSBitMap* _cms_bm; |
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110 protected: |
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111 DO_OOP_WORK_DEFN |
0 | 112 public: |
113 MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm, | |
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114 CMSBitMap* cms_bm); |
113
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115 virtual void do_oop(oop* p); |
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116 virtual void do_oop(narrowOop* p); |
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117 |
0 | 118 Prefetch::style prefetch_style() { |
119 return Prefetch::do_read; | |
120 } | |
121 }; | |
122 | |
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123 // The non-parallel version (the parallel version appears further below). |
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124 class PushAndMarkClosure: public MetadataAwareOopClosure { |
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125 private: |
935 | 126 CMSCollector* _collector; |
113
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127 MemRegion _span; |
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128 CMSBitMap* _bit_map; |
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129 CMSBitMap* _mod_union_table; |
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130 CMSMarkStack* _mark_stack; |
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131 bool _concurrent_precleaning; |
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132 protected: |
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133 DO_OOP_WORK_DEFN |
0 | 134 public: |
135 PushAndMarkClosure(CMSCollector* collector, | |
136 MemRegion span, | |
137 ReferenceProcessor* rp, | |
138 CMSBitMap* bit_map, | |
139 CMSBitMap* mod_union_table, | |
113
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140 CMSMarkStack* mark_stack, |
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141 bool concurrent_precleaning); |
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142 virtual void do_oop(oop* p); |
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143 virtual void do_oop(narrowOop* p); |
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144 inline void do_oop_nv(oop* p) { PushAndMarkClosure::do_oop_work(p); } |
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145 inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); } |
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146 |
0 | 147 Prefetch::style prefetch_style() { |
148 return Prefetch::do_read; | |
149 } | |
150 }; | |
151 | |
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152 // In the parallel case, the bit map and the |
0 | 153 // reference processor are currently all shared. Access to |
154 // these shared mutable structures must use appropriate | |
155 // synchronization (for instance, via CAS). The marking stack | |
156 // used in the non-parallel case above is here replaced with | |
157 // an OopTaskQueue structure to allow efficient work stealing. | |
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158 class Par_PushAndMarkClosure: public MetadataAwareOopClosure { |
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159 private: |
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160 CMSCollector* _collector; |
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161 MemRegion _span; |
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162 CMSBitMap* _bit_map; |
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163 OopTaskQueue* _work_queue; |
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164 protected: |
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165 DO_OOP_WORK_DEFN |
0 | 166 public: |
167 Par_PushAndMarkClosure(CMSCollector* collector, | |
168 MemRegion span, | |
169 ReferenceProcessor* rp, | |
170 CMSBitMap* bit_map, | |
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171 OopTaskQueue* work_queue); |
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172 virtual void do_oop(oop* p); |
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173 virtual void do_oop(narrowOop* p); |
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174 inline void do_oop_nv(oop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
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175 inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
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176 |
0 | 177 Prefetch::style prefetch_style() { |
178 return Prefetch::do_read; | |
179 } | |
180 }; | |
181 | |
182 // The non-parallel version (the parallel version appears further below). | |
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183 class MarkRefsIntoAndScanClosure: public MetadataAwareOopsInGenClosure { |
113
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184 private: |
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185 MemRegion _span; |
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186 CMSBitMap* _bit_map; |
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187 CMSMarkStack* _mark_stack; |
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188 PushAndMarkClosure _pushAndMarkClosure; |
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189 CMSCollector* _collector; |
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190 Mutex* _freelistLock; |
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191 bool _yield; |
0 | 192 // Whether closure is being used for concurrent precleaning |
113
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193 bool _concurrent_precleaning; |
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194 protected: |
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195 DO_OOP_WORK_DEFN |
0 | 196 public: |
197 MarkRefsIntoAndScanClosure(MemRegion span, | |
198 ReferenceProcessor* rp, | |
199 CMSBitMap* bit_map, | |
200 CMSBitMap* mod_union_table, | |
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201 CMSMarkStack* mark_stack, |
0 | 202 CMSCollector* collector, |
203 bool should_yield, | |
204 bool concurrent_precleaning); | |
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205 virtual void do_oop(oop* p); |
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206 virtual void do_oop(narrowOop* p); |
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207 inline void do_oop_nv(oop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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208 inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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209 |
0 | 210 Prefetch::style prefetch_style() { |
211 return Prefetch::do_read; | |
212 } | |
213 void set_freelistLock(Mutex* m) { | |
214 _freelistLock = m; | |
215 } | |
216 | |
217 private: | |
218 inline void do_yield_check(); | |
219 void do_yield_work(); | |
220 bool take_from_overflow_list(); | |
221 }; | |
222 | |
223 // Tn this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit | |
224 // stack and the bitMap are shared, so access needs to be suitably | |
225 // sycnhronized. An OopTaskQueue structure, supporting efficient | |
226 // workstealing, replaces a CMSMarkStack for storing grey objects. | |
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227 class Par_MarkRefsIntoAndScanClosure: public MetadataAwareOopsInGenClosure { |
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228 private: |
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229 MemRegion _span; |
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230 CMSBitMap* _bit_map; |
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231 OopTaskQueue* _work_queue; |
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232 const uint _low_water_mark; |
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233 Par_PushAndMarkClosure _par_pushAndMarkClosure; |
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234 protected: |
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235 DO_OOP_WORK_DEFN |
0 | 236 public: |
237 Par_MarkRefsIntoAndScanClosure(CMSCollector* collector, | |
238 MemRegion span, | |
239 ReferenceProcessor* rp, | |
240 CMSBitMap* bit_map, | |
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241 OopTaskQueue* work_queue); |
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242 virtual void do_oop(oop* p); |
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243 virtual void do_oop(narrowOop* p); |
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244 inline void do_oop_nv(oop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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245 inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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246 |
0 | 247 Prefetch::style prefetch_style() { |
248 return Prefetch::do_read; | |
249 } | |
250 void trim_queue(uint size); | |
251 }; | |
252 | |
253 // This closure is used during the concurrent marking phase | |
254 // following the first checkpoint. Its use is buried in | |
255 // the closure MarkFromRootsClosure. | |
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256 class PushOrMarkClosure: public MetadataAwareOopClosure { |
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257 private: |
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258 CMSCollector* _collector; |
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259 MemRegion _span; |
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260 CMSBitMap* _bitMap; |
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261 CMSMarkStack* _markStack; |
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262 HeapWord* const _finger; |
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263 MarkFromRootsClosure* const |
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264 _parent; |
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265 protected: |
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266 DO_OOP_WORK_DEFN |
0 | 267 public: |
268 PushOrMarkClosure(CMSCollector* cms_collector, | |
269 MemRegion span, | |
270 CMSBitMap* bitMap, | |
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271 CMSMarkStack* markStack, |
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272 HeapWord* finger, |
0 | 273 MarkFromRootsClosure* parent); |
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274 virtual void do_oop(oop* p); |
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275 virtual void do_oop(narrowOop* p); |
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276 inline void do_oop_nv(oop* p) { PushOrMarkClosure::do_oop_work(p); } |
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277 inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); } |
941 | 278 |
0 | 279 // Deal with a stack overflow condition |
280 void handle_stack_overflow(HeapWord* lost); | |
281 private: | |
282 inline void do_yield_check(); | |
283 }; | |
284 | |
285 // A parallel (MT) version of the above. | |
286 // This closure is used during the concurrent marking phase | |
287 // following the first checkpoint. Its use is buried in | |
288 // the closure Par_MarkFromRootsClosure. | |
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289 class Par_PushOrMarkClosure: public MetadataAwareOopClosure { |
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290 private: |
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291 CMSCollector* _collector; |
0 | 292 MemRegion _whole_span; |
293 MemRegion _span; // local chunk | |
294 CMSBitMap* _bit_map; | |
295 OopTaskQueue* _work_queue; | |
296 CMSMarkStack* _overflow_stack; | |
297 HeapWord* const _finger; | |
298 HeapWord** const _global_finger_addr; | |
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299 Par_MarkFromRootsClosure* const |
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300 _parent; |
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301 protected: |
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302 DO_OOP_WORK_DEFN |
0 | 303 public: |
304 Par_PushOrMarkClosure(CMSCollector* cms_collector, | |
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305 MemRegion span, |
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306 CMSBitMap* bit_map, |
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307 OopTaskQueue* work_queue, |
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308 CMSMarkStack* mark_stack, |
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309 HeapWord* finger, |
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310 HeapWord** global_finger_addr, |
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311 Par_MarkFromRootsClosure* parent); |
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312 virtual void do_oop(oop* p); |
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313 virtual void do_oop(narrowOop* p); |
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314 inline void do_oop_nv(oop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
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315 inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
941 | 316 |
0 | 317 // Deal with a stack overflow condition |
318 void handle_stack_overflow(HeapWord* lost); | |
319 private: | |
320 inline void do_yield_check(); | |
321 }; | |
322 | |
323 // For objects in CMS generation, this closure marks | |
324 // given objects (transitively) as being reachable/live. | |
325 // This is currently used during the (weak) reference object | |
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326 // processing phase of the CMS final checkpoint step, as |
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327 // well as during the concurrent precleaning of the discovered |
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328 // reference lists. |
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329 class CMSKeepAliveClosure: public MetadataAwareOopClosure { |
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330 private: |
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331 CMSCollector* _collector; |
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332 const MemRegion _span; |
0 | 333 CMSMarkStack* _mark_stack; |
334 CMSBitMap* _bit_map; | |
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335 bool _concurrent_precleaning; |
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336 protected: |
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337 DO_OOP_WORK_DEFN |
0 | 338 public: |
339 CMSKeepAliveClosure(CMSCollector* collector, MemRegion span, | |
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340 CMSBitMap* bit_map, CMSMarkStack* mark_stack, |
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341 bool cpc); |
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342 bool concurrent_precleaning() const { return _concurrent_precleaning; } |
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343 virtual void do_oop(oop* p); |
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344 virtual void do_oop(narrowOop* p); |
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345 inline void do_oop_nv(oop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
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346 inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
0 | 347 }; |
348 | |
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349 class CMSInnerParMarkAndPushClosure: public MetadataAwareOopClosure { |
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350 private: |
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351 CMSCollector* _collector; |
0 | 352 MemRegion _span; |
353 OopTaskQueue* _work_queue; | |
354 CMSBitMap* _bit_map; | |
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355 protected: |
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356 DO_OOP_WORK_DEFN |
0 | 357 public: |
358 CMSInnerParMarkAndPushClosure(CMSCollector* collector, | |
359 MemRegion span, CMSBitMap* bit_map, | |
935 | 360 OopTaskQueue* work_queue); |
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361 virtual void do_oop(oop* p); |
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362 virtual void do_oop(narrowOop* p); |
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363 inline void do_oop_nv(oop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
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364 inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
0 | 365 }; |
366 | |
367 // A parallel (MT) version of the above, used when | |
368 // reference processing is parallel; the only difference | |
369 // is in the do_oop method. | |
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370 class CMSParKeepAliveClosure: public MetadataAwareOopClosure { |
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371 private: |
0 | 372 MemRegion _span; |
373 OopTaskQueue* _work_queue; | |
374 CMSBitMap* _bit_map; | |
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375 CMSInnerParMarkAndPushClosure |
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376 _mark_and_push; |
0 | 377 const uint _low_water_mark; |
378 void trim_queue(uint max); | |
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379 protected: |
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380 DO_OOP_WORK_DEFN |
0 | 381 public: |
382 CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span, | |
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383 CMSBitMap* bit_map, OopTaskQueue* work_queue); |
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384 virtual void do_oop(oop* p); |
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385 virtual void do_oop(narrowOop* p); |
0 | 386 }; |
1972 | 387 |
388 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |