Mercurial > hg > graal-compiler

annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp @ 14909:4ca6dc0799b6

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Backout jdk9 merge
author Gilles Duboscq <duboscq@ssw.jku.at>
date Tue, 01 Apr 2014 13:57:07 +0200
parents 63a4eb8bcd23
children 89152779163c
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1 /*
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2 * Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP
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27
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28 #include "memory/genOopClosures.hpp"
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29
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30 /////////////////////////////////////////////////////////////////
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31 // Closures used by ConcurrentMarkSweepGeneration's collector
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32 /////////////////////////////////////////////////////////////////
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33 class ConcurrentMarkSweepGeneration;
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34 class CMSBitMap;
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35 class CMSMarkStack;
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36 class CMSCollector;
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37 class MarkFromRootsClosure;
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38 class Par_MarkFromRootsClosure;
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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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115 public:
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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
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120 Prefetch::style prefetch_style() {
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121 return Prefetch::do_read;
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122 }
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123 };
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124
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125 class Par_MarkRefsIntoClosure: public CMSOopsInGenClosure {
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126 private:
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127 const MemRegion _span;
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128 CMSBitMap* _bitMap;
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129 protected:
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130 DO_OOP_WORK_DEFN
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131 public:
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132 Par_MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap);
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133 virtual void do_oop(oop* p);
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134 virtual void do_oop(narrowOop* p);
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135
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136 Prefetch::style prefetch_style() {
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137 return Prefetch::do_read;
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138 }
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139 };
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140
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141 // A variant of the above used in certain kinds of CMS
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142 // marking verification.
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143 class MarkRefsIntoVerifyClosure: public CMSOopsInGenClosure {
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144 private:
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145 const MemRegion _span;
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146 CMSBitMap* _verification_bm;
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147 CMSBitMap* _cms_bm;
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148 protected:
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149 DO_OOP_WORK_DEFN
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150 public:
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151 MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm,
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152 CMSBitMap* cms_bm);
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153 virtual void do_oop(oop* p);
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154 virtual void do_oop(narrowOop* p);
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155
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156 Prefetch::style prefetch_style() {
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157 return Prefetch::do_read;
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158 }
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159 };
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160
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161 // The non-parallel version (the parallel version appears further below).
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162 class PushAndMarkClosure: public CMSOopClosure {
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163 private:
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164 CMSCollector* _collector;
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165 MemRegion _span;
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166 CMSBitMap* _bit_map;
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167 CMSBitMap* _mod_union_table;
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168 CMSMarkStack* _mark_stack;
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169 bool _concurrent_precleaning;
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170 protected:
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171 DO_OOP_WORK_DEFN
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172 public:
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173 PushAndMarkClosure(CMSCollector* collector,
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174 MemRegion span,
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175 ReferenceProcessor* rp,
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176 CMSBitMap* bit_map,
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177 CMSBitMap* mod_union_table,
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178 CMSMarkStack* mark_stack,
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179 bool concurrent_precleaning);
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180 virtual void do_oop(oop* p);
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181 virtual void do_oop(narrowOop* p);
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182 inline void do_oop_nv(oop* p) { PushAndMarkClosure::do_oop_work(p); }
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183 inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); }
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184
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185 Prefetch::style prefetch_style() {
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186 return Prefetch::do_read;
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187 }
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188 };
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189
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190 // In the parallel case, the bit map and the
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191 // reference processor are currently all shared. Access to
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192 // these shared mutable structures must use appropriate
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193 // synchronization (for instance, via CAS). The marking stack
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194 // used in the non-parallel case above is here replaced with
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195 // an OopTaskQueue structure to allow efficient work stealing.
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196 class Par_PushAndMarkClosure: public CMSOopClosure {
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197 private:
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198 CMSCollector* _collector;
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199 MemRegion _span;
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200 CMSBitMap* _bit_map;
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201 OopTaskQueue* _work_queue;
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202 protected:
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203 DO_OOP_WORK_DEFN
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204 public:
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205 Par_PushAndMarkClosure(CMSCollector* collector,
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206 MemRegion span,
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207 ReferenceProcessor* rp,
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208 CMSBitMap* bit_map,
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209 OopTaskQueue* work_queue);
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210 virtual void do_oop(oop* p);
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211 virtual void do_oop(narrowOop* p);
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212 inline void do_oop_nv(oop* p) { Par_PushAndMarkClosure::do_oop_work(p); }
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213 inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); }
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214
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215 Prefetch::style prefetch_style() {
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216 return Prefetch::do_read;
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217 }
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218 };
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219
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220 // The non-parallel version (the parallel version appears further below).
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221 class MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure {
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222 private:
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223 MemRegion _span;
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224 CMSBitMap* _bit_map;
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225 CMSMarkStack* _mark_stack;
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226 PushAndMarkClosure _pushAndMarkClosure;
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227 CMSCollector* _collector;
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228 Mutex* _freelistLock;
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229 bool _yield;
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230 // Whether closure is being used for concurrent precleaning
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231 bool _concurrent_precleaning;
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232 protected:
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233 DO_OOP_WORK_DEFN
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234 public:
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235 MarkRefsIntoAndScanClosure(MemRegion span,
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236 ReferenceProcessor* rp,
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237 CMSBitMap* bit_map,
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238 CMSBitMap* mod_union_table,
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239 CMSMarkStack* mark_stack,
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240 CMSCollector* collector,
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241 bool should_yield,
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242 bool concurrent_precleaning);
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243 virtual void do_oop(oop* p);
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244 virtual void do_oop(narrowOop* p);
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245 inline void do_oop_nv(oop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); }
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246 inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); }
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247
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248 Prefetch::style prefetch_style() {
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249 return Prefetch::do_read;
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250 }
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251 void set_freelistLock(Mutex* m) {
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252 _freelistLock = m;
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253 }
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254
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255 private:
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256 inline void do_yield_check();
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257 void do_yield_work();
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258 bool take_from_overflow_list();
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259 };
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260
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261 // Tn this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit
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262 // stack and the bitMap are shared, so access needs to be suitably
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263 // sycnhronized. An OopTaskQueue structure, supporting efficient
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264 // workstealing, replaces a CMSMarkStack for storing grey objects.
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265 class Par_MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure {
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266 private:
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267 MemRegion _span;
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268 CMSBitMap* _bit_map;
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269 OopTaskQueue* _work_queue;
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270 const uint _low_water_mark;
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271 Par_PushAndMarkClosure _par_pushAndMarkClosure;
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272 protected:
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273 DO_OOP_WORK_DEFN
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274 public:
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275 Par_MarkRefsIntoAndScanClosure(CMSCollector* collector,
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276 MemRegion span,
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277 ReferenceProcessor* rp,
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278 CMSBitMap* bit_map,
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279 OopTaskQueue* work_queue);
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280 virtual void do_oop(oop* p);
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281 virtual void do_oop(narrowOop* p);
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282 inline void do_oop_nv(oop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); }
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283 inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); }
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284
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285 Prefetch::style prefetch_style() {
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286 return Prefetch::do_read;
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287 }
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288 void trim_queue(uint size);
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289 };
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290
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291 // This closure is used during the concurrent marking phase
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292 // following the first checkpoint. Its use is buried in
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293 // the closure MarkFromRootsClosure.
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294 class PushOrMarkClosure: public CMSOopClosure {
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295 private:
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296 CMSCollector* _collector;
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297 MemRegion _span;
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298 CMSBitMap* _bitMap;
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299 CMSMarkStack* _markStack;
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300 HeapWord* const _finger;
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301 MarkFromRootsClosure* const
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302 _parent;
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303 protected:
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304 DO_OOP_WORK_DEFN
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305 public:
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306 PushOrMarkClosure(CMSCollector* cms_collector,
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307 MemRegion span,
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308 CMSBitMap* bitMap,
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309 CMSMarkStack* markStack,
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310 HeapWord* finger,
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311 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) { PushOrMarkClosure::do_oop_work(p); }
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315 inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); }
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316
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317 // Deal with a stack overflow condition
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318 void handle_stack_overflow(HeapWord* lost);
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319 private:
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320 inline void do_yield_check();
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321 };
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322
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323 // A parallel (MT) version of the above.
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324 // This closure is used during the concurrent marking phase
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325 // following the first checkpoint. Its use is buried in
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326 // the closure Par_MarkFromRootsClosure.
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327 class Par_PushOrMarkClosure: public CMSOopClosure {
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328 private:
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329 CMSCollector* _collector;
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330 MemRegion _whole_span;
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331 MemRegion _span; // local chunk
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332 CMSBitMap* _bit_map;
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333 OopTaskQueue* _work_queue;
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334 CMSMarkStack* _overflow_stack;
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335 HeapWord* const _finger;
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336 HeapWord** const _global_finger_addr;
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337 Par_MarkFromRootsClosure* const
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338 _parent;
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339 protected:
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340 DO_OOP_WORK_DEFN
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341 public:
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342 Par_PushOrMarkClosure(CMSCollector* cms_collector,
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343 MemRegion span,
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344 CMSBitMap* bit_map,
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345 OopTaskQueue* work_queue,
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346 CMSMarkStack* mark_stack,
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347 HeapWord* finger,
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348 HeapWord** global_finger_addr,
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349 Par_MarkFromRootsClosure* parent);
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350 virtual void do_oop(oop* p);
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351 virtual void do_oop(narrowOop* p);
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352 inline void do_oop_nv(oop* p) { Par_PushOrMarkClosure::do_oop_work(p); }
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353 inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); }
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354
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355 // Deal with a stack overflow condition
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356 void handle_stack_overflow(HeapWord* lost);
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357 private:
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358 inline void do_yield_check();
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359 };
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360
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361 // For objects in CMS generation, this closure marks
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362 // given objects (transitively) as being reachable/live.
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363 // This is currently used during the (weak) reference object
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364 // processing phase of the CMS final checkpoint step, as
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365 // well as during the concurrent precleaning of the discovered
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366 // reference lists.
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367 class CMSKeepAliveClosure: public CMSOopClosure {
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368 private:
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369 CMSCollector* _collector;
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370 const MemRegion _span;
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371 CMSMarkStack* _mark_stack;
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372 CMSBitMap* _bit_map;
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373 bool _concurrent_precleaning;
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374 protected:
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375 DO_OOP_WORK_DEFN
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376 public:
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377 CMSKeepAliveClosure(CMSCollector* collector, MemRegion span,
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378 CMSBitMap* bit_map, CMSMarkStack* mark_stack,
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379 bool cpc);
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380 bool concurrent_precleaning() const { return _concurrent_precleaning; }
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381 virtual void do_oop(oop* p);
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382 virtual void do_oop(narrowOop* p);
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383 inline void do_oop_nv(oop* p) { CMSKeepAliveClosure::do_oop_work(p); }
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384 inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); }
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385 };
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386
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387 class CMSInnerParMarkAndPushClosure: public CMSOopClosure {
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388 private:
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389 CMSCollector* _collector;
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390 MemRegion _span;
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391 OopTaskQueue* _work_queue;
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392 CMSBitMap* _bit_map;
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393 protected:
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394 DO_OOP_WORK_DEFN
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395 public:
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396 CMSInnerParMarkAndPushClosure(CMSCollector* collector,
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397 MemRegion span, CMSBitMap* bit_map,
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398 OopTaskQueue* work_queue);
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399 virtual void do_oop(oop* p);
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400 virtual void do_oop(narrowOop* p);
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401 inline void do_oop_nv(oop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); }
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402 inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); }
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403 };
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404
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405 // A parallel (MT) version of the above, used when
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406 // reference processing is parallel; the only difference
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407 // is in the do_oop method.
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408 class CMSParKeepAliveClosure: public CMSOopClosure {
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409 private:
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410 MemRegion _span;
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411 OopTaskQueue* _work_queue;
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412 CMSBitMap* _bit_map;
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413 CMSInnerParMarkAndPushClosure
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414 _mark_and_push;
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415 const uint _low_water_mark;
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416 void trim_queue(uint max);
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417 protected:
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418 DO_OOP_WORK_DEFN
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419 public:
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420 CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span,
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421 CMSBitMap* bit_map, OopTaskQueue* work_queue);
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422 virtual void do_oop(oop* p);
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423 virtual void do_oop(narrowOop* p);
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424 };
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425
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426 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP