Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp @ 6862:8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
Summary: Change the type of various task num fields, parameters etc to unsigned and rename them to be more consistent with the other collectors. Code changes were also reviewed by Vitaly Davidovich.
Reviewed-by: johnc
Contributed-by: Kaushik Srenevasan <kaushik@twitter.com>
author | johnc |
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date | Sat, 06 Oct 2012 01:17:44 -0700 |
parents | da91efe96a93 |
children | ca9dedeebdec |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2007, 2012, 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" | |
29 | |
0 | 30 ///////////////////////////////////////////////////////////////// |
31 // Closures used by ConcurrentMarkSweepGeneration's collector | |
32 ///////////////////////////////////////////////////////////////// | |
33 class ConcurrentMarkSweepGeneration; | |
34 class CMSBitMap; | |
35 class CMSMarkStack; | |
36 class CMSCollector; | |
37 class MarkFromRootsClosure; | |
38 class Par_MarkFromRootsClosure; | |
39 | |
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40 // Decode the oop and call do_oop on it. |
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41 #define DO_OOP_WORK_DEFN \ |
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42 void do_oop(oop obj); \ |
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43 template <class T> inline void do_oop_work(T* p) { \ |
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44 T heap_oop = oopDesc::load_heap_oop(p); \ |
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45 if (!oopDesc::is_null(heap_oop)) { \ |
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46 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); \ |
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47 do_oop(obj); \ |
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48 } \ |
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49 } |
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50 |
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51 // Applies the given oop closure to all oops in all klasses visited. |
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52 class CMKlassClosure : public KlassClosure { |
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53 friend class CMSOopClosure; |
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54 friend class CMSOopsInGenClosure; |
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55 |
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56 OopClosure* _oop_closure; |
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57 |
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58 // Used when _oop_closure couldn't be set in an initialization list. |
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59 void initialize(OopClosure* oop_closure) { |
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60 assert(_oop_closure == NULL, "Should only be called once"); |
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61 _oop_closure = oop_closure; |
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62 } |
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63 public: |
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64 CMKlassClosure(OopClosure* oop_closure = NULL) : _oop_closure(oop_closure) { } |
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65 |
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66 void do_klass(Klass* k); |
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67 }; |
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68 |
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69 // The base class for all CMS marking closures. |
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70 // It's used to proxy through the metadata to the oops defined in them. |
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71 class CMSOopClosure: public ExtendedOopClosure { |
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72 CMKlassClosure _klass_closure; |
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73 public: |
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74 CMSOopClosure() : ExtendedOopClosure() { |
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75 _klass_closure.initialize(this); |
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76 } |
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77 CMSOopClosure(ReferenceProcessor* rp) : ExtendedOopClosure(rp) { |
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78 _klass_closure.initialize(this); |
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79 } |
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80 |
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81 virtual bool do_metadata() { return do_metadata_nv(); } |
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82 inline bool do_metadata_nv() { return true; } |
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83 |
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84 virtual void do_klass(Klass* k); |
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85 void do_klass_nv(Klass* k); |
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86 |
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87 virtual void do_class_loader_data(ClassLoaderData* cld); |
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88 }; |
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89 |
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90 // TODO: This duplication of the CMSOopClosure class is only needed because |
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91 // some CMS OopClosures derive from OopsInGenClosure. It would be good |
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92 // to get rid of them completely. |
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93 class CMSOopsInGenClosure: public OopsInGenClosure { |
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94 CMKlassClosure _klass_closure; |
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95 public: |
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96 CMSOopsInGenClosure() { |
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97 _klass_closure.initialize(this); |
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98 } |
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99 |
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100 virtual bool do_metadata() { return do_metadata_nv(); } |
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101 inline bool do_metadata_nv() { return true; } |
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102 |
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103 virtual void do_klass(Klass* k); |
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104 void do_klass_nv(Klass* k); |
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105 |
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106 virtual void do_class_loader_data(ClassLoaderData* cld); |
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107 }; |
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108 |
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109 class MarkRefsIntoClosure: public CMSOopsInGenClosure { |
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110 private: |
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111 const MemRegion _span; |
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112 CMSBitMap* _bitMap; |
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113 protected: |
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114 DO_OOP_WORK_DEFN |
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116 MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); |
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117 virtual void do_oop(oop* p); |
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118 virtual void do_oop(narrowOop* p); |
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119 |
0 | 120 Prefetch::style prefetch_style() { |
121 return Prefetch::do_read; | |
122 } | |
123 }; | |
124 | |
125 // A variant of the above used in certain kinds of CMS | |
126 // marking verification. | |
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127 class MarkRefsIntoVerifyClosure: public CMSOopsInGenClosure { |
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128 private: |
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129 const MemRegion _span; |
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130 CMSBitMap* _verification_bm; |
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131 CMSBitMap* _cms_bm; |
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132 protected: |
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133 DO_OOP_WORK_DEFN |
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135 MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm, | |
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136 CMSBitMap* cms_bm); |
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137 virtual void do_oop(oop* p); |
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138 virtual void do_oop(narrowOop* p); |
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139 |
0 | 140 Prefetch::style prefetch_style() { |
141 return Prefetch::do_read; | |
142 } | |
143 }; | |
144 | |
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145 // The non-parallel version (the parallel version appears further below). |
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146 class PushAndMarkClosure: public CMSOopClosure { |
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147 private: |
935 | 148 CMSCollector* _collector; |
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149 MemRegion _span; |
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150 CMSBitMap* _bit_map; |
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151 CMSBitMap* _mod_union_table; |
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152 CMSMarkStack* _mark_stack; |
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153 bool _concurrent_precleaning; |
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154 protected: |
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155 DO_OOP_WORK_DEFN |
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157 PushAndMarkClosure(CMSCollector* collector, | |
158 MemRegion span, | |
159 ReferenceProcessor* rp, | |
160 CMSBitMap* bit_map, | |
161 CMSBitMap* mod_union_table, | |
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162 CMSMarkStack* mark_stack, |
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163 bool concurrent_precleaning); |
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164 virtual void do_oop(oop* p); |
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165 virtual void do_oop(narrowOop* p); |
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166 inline void do_oop_nv(oop* p) { PushAndMarkClosure::do_oop_work(p); } |
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167 inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); } |
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168 |
0 | 169 Prefetch::style prefetch_style() { |
170 return Prefetch::do_read; | |
171 } | |
172 }; | |
173 | |
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174 // In the parallel case, the bit map and the |
0 | 175 // reference processor are currently all shared. Access to |
176 // these shared mutable structures must use appropriate | |
177 // synchronization (for instance, via CAS). The marking stack | |
178 // used in the non-parallel case above is here replaced with | |
179 // an OopTaskQueue structure to allow efficient work stealing. | |
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180 class Par_PushAndMarkClosure: public CMSOopClosure { |
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181 private: |
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182 CMSCollector* _collector; |
113
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183 MemRegion _span; |
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184 CMSBitMap* _bit_map; |
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185 OopTaskQueue* _work_queue; |
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186 protected: |
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187 DO_OOP_WORK_DEFN |
0 | 188 public: |
189 Par_PushAndMarkClosure(CMSCollector* collector, | |
190 MemRegion span, | |
191 ReferenceProcessor* rp, | |
192 CMSBitMap* bit_map, | |
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193 OopTaskQueue* work_queue); |
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194 virtual void do_oop(oop* p); |
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195 virtual void do_oop(narrowOop* p); |
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196 inline void do_oop_nv(oop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
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197 inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
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198 |
0 | 199 Prefetch::style prefetch_style() { |
200 return Prefetch::do_read; | |
201 } | |
202 }; | |
203 | |
204 // The non-parallel version (the parallel version appears further below). | |
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205 class MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure { |
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206 private: |
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207 MemRegion _span; |
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208 CMSBitMap* _bit_map; |
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209 CMSMarkStack* _mark_stack; |
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210 PushAndMarkClosure _pushAndMarkClosure; |
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211 CMSCollector* _collector; |
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212 Mutex* _freelistLock; |
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213 bool _yield; |
0 | 214 // Whether closure is being used for concurrent precleaning |
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215 bool _concurrent_precleaning; |
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216 protected: |
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217 DO_OOP_WORK_DEFN |
0 | 218 public: |
219 MarkRefsIntoAndScanClosure(MemRegion span, | |
220 ReferenceProcessor* rp, | |
221 CMSBitMap* bit_map, | |
222 CMSBitMap* mod_union_table, | |
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223 CMSMarkStack* mark_stack, |
0 | 224 CMSCollector* collector, |
225 bool should_yield, | |
226 bool concurrent_precleaning); | |
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227 virtual void do_oop(oop* p); |
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228 virtual void do_oop(narrowOop* p); |
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229 inline void do_oop_nv(oop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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230 inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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231 |
0 | 232 Prefetch::style prefetch_style() { |
233 return Prefetch::do_read; | |
234 } | |
235 void set_freelistLock(Mutex* m) { | |
236 _freelistLock = m; | |
237 } | |
238 | |
239 private: | |
240 inline void do_yield_check(); | |
241 void do_yield_work(); | |
242 bool take_from_overflow_list(); | |
243 }; | |
244 | |
245 // Tn this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit | |
246 // stack and the bitMap are shared, so access needs to be suitably | |
247 // sycnhronized. An OopTaskQueue structure, supporting efficient | |
248 // workstealing, replaces a CMSMarkStack for storing grey objects. | |
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249 class Par_MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure { |
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250 private: |
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251 MemRegion _span; |
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252 CMSBitMap* _bit_map; |
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253 OopTaskQueue* _work_queue; |
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254 const uint _low_water_mark; |
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255 Par_PushAndMarkClosure _par_pushAndMarkClosure; |
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256 protected: |
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257 DO_OOP_WORK_DEFN |
0 | 258 public: |
259 Par_MarkRefsIntoAndScanClosure(CMSCollector* collector, | |
260 MemRegion span, | |
261 ReferenceProcessor* rp, | |
262 CMSBitMap* bit_map, | |
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263 OopTaskQueue* work_queue); |
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264 virtual void do_oop(oop* p); |
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265 virtual void do_oop(narrowOop* p); |
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266 inline void do_oop_nv(oop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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267 inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
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268 |
0 | 269 Prefetch::style prefetch_style() { |
270 return Prefetch::do_read; | |
271 } | |
272 void trim_queue(uint size); | |
273 }; | |
274 | |
275 // This closure is used during the concurrent marking phase | |
276 // following the first checkpoint. Its use is buried in | |
277 // the closure MarkFromRootsClosure. | |
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278 class PushOrMarkClosure: public CMSOopClosure { |
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279 private: |
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280 CMSCollector* _collector; |
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281 MemRegion _span; |
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282 CMSBitMap* _bitMap; |
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283 CMSMarkStack* _markStack; |
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284 HeapWord* const _finger; |
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285 MarkFromRootsClosure* const |
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286 _parent; |
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287 protected: |
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288 DO_OOP_WORK_DEFN |
0 | 289 public: |
290 PushOrMarkClosure(CMSCollector* cms_collector, | |
291 MemRegion span, | |
292 CMSBitMap* bitMap, | |
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293 CMSMarkStack* markStack, |
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294 HeapWord* finger, |
0 | 295 MarkFromRootsClosure* parent); |
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296 virtual void do_oop(oop* p); |
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297 virtual void do_oop(narrowOop* p); |
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298 inline void do_oop_nv(oop* p) { PushOrMarkClosure::do_oop_work(p); } |
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299 inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); } |
941 | 300 |
0 | 301 // Deal with a stack overflow condition |
302 void handle_stack_overflow(HeapWord* lost); | |
303 private: | |
304 inline void do_yield_check(); | |
305 }; | |
306 | |
307 // A parallel (MT) version of the above. | |
308 // This closure is used during the concurrent marking phase | |
309 // following the first checkpoint. Its use is buried in | |
310 // the closure Par_MarkFromRootsClosure. | |
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311 class Par_PushOrMarkClosure: public CMSOopClosure { |
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312 private: |
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313 CMSCollector* _collector; |
0 | 314 MemRegion _whole_span; |
315 MemRegion _span; // local chunk | |
316 CMSBitMap* _bit_map; | |
317 OopTaskQueue* _work_queue; | |
318 CMSMarkStack* _overflow_stack; | |
319 HeapWord* const _finger; | |
320 HeapWord** const _global_finger_addr; | |
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321 Par_MarkFromRootsClosure* const |
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322 _parent; |
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323 protected: |
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324 DO_OOP_WORK_DEFN |
0 | 325 public: |
326 Par_PushOrMarkClosure(CMSCollector* cms_collector, | |
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327 MemRegion span, |
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328 CMSBitMap* bit_map, |
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329 OopTaskQueue* work_queue, |
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330 CMSMarkStack* mark_stack, |
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331 HeapWord* finger, |
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332 HeapWord** global_finger_addr, |
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333 Par_MarkFromRootsClosure* parent); |
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334 virtual void do_oop(oop* p); |
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335 virtual void do_oop(narrowOop* p); |
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336 inline void do_oop_nv(oop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
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337 inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
941 | 338 |
0 | 339 // Deal with a stack overflow condition |
340 void handle_stack_overflow(HeapWord* lost); | |
341 private: | |
342 inline void do_yield_check(); | |
343 }; | |
344 | |
345 // For objects in CMS generation, this closure marks | |
346 // given objects (transitively) as being reachable/live. | |
347 // This is currently used during the (weak) reference object | |
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348 // processing phase of the CMS final checkpoint step, as |
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349 // well as during the concurrent precleaning of the discovered |
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350 // reference lists. |
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351 class CMSKeepAliveClosure: public CMSOopClosure { |
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352 private: |
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353 CMSCollector* _collector; |
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354 const MemRegion _span; |
0 | 355 CMSMarkStack* _mark_stack; |
356 CMSBitMap* _bit_map; | |
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357 bool _concurrent_precleaning; |
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358 protected: |
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359 DO_OOP_WORK_DEFN |
0 | 360 public: |
361 CMSKeepAliveClosure(CMSCollector* collector, MemRegion span, | |
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362 CMSBitMap* bit_map, CMSMarkStack* mark_stack, |
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363 bool cpc); |
452
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364 bool concurrent_precleaning() const { return _concurrent_precleaning; } |
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365 virtual void do_oop(oop* p); |
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366 virtual void do_oop(narrowOop* p); |
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367 inline void do_oop_nv(oop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
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368 inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
0 | 369 }; |
370 | |
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371 class CMSInnerParMarkAndPushClosure: public CMSOopClosure { |
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372 private: |
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373 CMSCollector* _collector; |
0 | 374 MemRegion _span; |
375 OopTaskQueue* _work_queue; | |
376 CMSBitMap* _bit_map; | |
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377 protected: |
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378 DO_OOP_WORK_DEFN |
0 | 379 public: |
380 CMSInnerParMarkAndPushClosure(CMSCollector* collector, | |
381 MemRegion span, CMSBitMap* bit_map, | |
935 | 382 OopTaskQueue* work_queue); |
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383 virtual void do_oop(oop* p); |
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384 virtual void do_oop(narrowOop* p); |
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385 inline void do_oop_nv(oop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
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386 inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
0 | 387 }; |
388 | |
389 // A parallel (MT) version of the above, used when | |
390 // reference processing is parallel; the only difference | |
391 // is in the do_oop method. | |
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392 class CMSParKeepAliveClosure: public CMSOopClosure { |
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393 private: |
0 | 394 MemRegion _span; |
395 OopTaskQueue* _work_queue; | |
396 CMSBitMap* _bit_map; | |
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397 CMSInnerParMarkAndPushClosure |
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398 _mark_and_push; |
0 | 399 const uint _low_water_mark; |
400 void trim_queue(uint max); | |
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401 protected: |
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402 DO_OOP_WORK_DEFN |
0 | 403 public: |
404 CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span, | |
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405 CMSBitMap* bit_map, OopTaskQueue* work_queue); |
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406 virtual void do_oop(oop* p); |
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407 virtual void do_oop(narrowOop* p); |
0 | 408 }; |
1972 | 409 |
410 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |