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annotate src/share/vm/memory/genOopClosures.hpp @ 12355:cefad50507d8

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Merge with hs25-b53
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 11 Oct 2013 10:38:03 +0200
parents da91efe96a93
children 78bbf4d43a14
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1 /*
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2 * Copyright (c) 2001, 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_MEMORY_GENOOPCLOSURES_HPP
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26 #define SHARE_VM_MEMORY_GENOOPCLOSURES_HPP
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27
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28 #include "memory/iterator.hpp"
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29 #include "oops/oop.hpp"
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30
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31 class Generation;
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32 class HeapWord;
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33 class CardTableRS;
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34 class CardTableModRefBS;
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35 class DefNewGeneration;
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36 class KlassRemSet;
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37
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38 template<class E, MEMFLAGS F, unsigned int N> class GenericTaskQueue;
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39 typedef GenericTaskQueue<oop, mtGC, TASKQUEUE_SIZE> OopTaskQueue;
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40 template<class T, MEMFLAGS F> class GenericTaskQueueSet;
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41 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet;
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42
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43 // Closure for iterating roots from a particular generation
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44 // Note: all classes deriving from this MUST call this do_barrier
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45 // method at the end of their own do_oop method!
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46 // Note: no do_oop defined, this is an abstract class.
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47
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48 class OopsInGenClosure : public ExtendedOopClosure {
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49 private:
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50 Generation* _orig_gen; // generation originally set in ctor
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51 Generation* _gen; // generation being scanned
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52
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53 protected:
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54 // Some subtypes need access.
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55 HeapWord* _gen_boundary; // start of generation
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56 CardTableRS* _rs; // remembered set
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57
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58 // For assertions
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59 Generation* generation() { return _gen; }
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60 CardTableRS* rs() { return _rs; }
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61
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62 // Derived classes that modify oops so that they might be old-to-young
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63 // pointers must call the method below.
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64 template <class T> void do_barrier(T* p);
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65
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66 // Version for use by closures that may be called in parallel code.
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67 template <class T> void par_do_barrier(T* p);
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68
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69 public:
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70 OopsInGenClosure() : ExtendedOopClosure(NULL),
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71 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
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72
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73 OopsInGenClosure(Generation* gen);
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74 void set_generation(Generation* gen);
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75
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76 void reset_generation() { _gen = _orig_gen; }
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77
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78 // Problem with static closures: must have _gen_boundary set at some point,
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79 // but cannot do this until after the heap is initialized.
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80 void set_orig_generation(Generation* gen) {
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81 _orig_gen = gen;
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82 set_generation(gen);
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83 }
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84
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85 HeapWord* gen_boundary() { return _gen_boundary; }
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86
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87 };
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88
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89 // Super class for scan closures. It contains code to dirty scanned Klasses.
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90 class OopsInKlassOrGenClosure: public OopsInGenClosure {
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91 Klass* _scanned_klass;
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92 public:
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93 OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {}
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94 void set_scanned_klass(Klass* k) {
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95 assert(k == NULL || _scanned_klass == NULL, "Must be");
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96 _scanned_klass = k;
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97 }
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98 bool is_scanning_a_klass() { return _scanned_klass != NULL; }
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99 void do_klass_barrier();
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100 };
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101
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102 // Closure for scanning DefNewGeneration.
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103 //
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104 // This closure will perform barrier store calls for ALL
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105 // pointers in scanned oops.
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106 class ScanClosure: public OopsInKlassOrGenClosure {
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107 protected:
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108 DefNewGeneration* _g;
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109 HeapWord* _boundary;
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110 bool _gc_barrier;
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111 template <class T> inline void do_oop_work(T* p);
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112 public:
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113 ScanClosure(DefNewGeneration* g, bool gc_barrier);
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114 virtual void do_oop(oop* p);
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115 virtual void do_oop(narrowOop* p);
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116 inline void do_oop_nv(oop* p);
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117 inline void do_oop_nv(narrowOop* p);
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118 Prefetch::style prefetch_style() {
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119 return Prefetch::do_write;
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120 }
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121 };
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122
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123 // Closure for scanning DefNewGeneration.
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124 //
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125 // This closure only performs barrier store calls on
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126 // pointers into the DefNewGeneration. This is less
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127 // precise, but faster, than a ScanClosure
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128 class FastScanClosure: public OopsInKlassOrGenClosure {
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129 protected:
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130 DefNewGeneration* _g;
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131 HeapWord* _boundary;
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132 bool _gc_barrier;
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133 template <class T> inline void do_oop_work(T* p);
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134 public:
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135 FastScanClosure(DefNewGeneration* g, bool gc_barrier);
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136 virtual void do_oop(oop* p);
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137 virtual void do_oop(narrowOop* p);
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138 inline void do_oop_nv(oop* p);
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139 inline void do_oop_nv(narrowOop* p);
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140 Prefetch::style prefetch_style() {
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141 return Prefetch::do_write;
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142 }
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143 };
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144
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145 class KlassScanClosure: public KlassClosure {
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146 OopsInKlassOrGenClosure* _scavenge_closure;
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147 // true if the the modified oops state should be saved.
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148 bool _accumulate_modified_oops;
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149 public:
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150 KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure,
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151 KlassRemSet* klass_rem_set_policy);
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152 void do_klass(Klass* k);
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153 };
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154
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155 class FilteringClosure: public ExtendedOopClosure {
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156 private:
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157 HeapWord* _boundary;
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158 ExtendedOopClosure* _cl;
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159 protected:
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160 template <class T> inline void do_oop_work(T* p) {
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161 T heap_oop = oopDesc::load_heap_oop(p);
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162 if (!oopDesc::is_null(heap_oop)) {
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163 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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164 if ((HeapWord*)obj < _boundary) {
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165 _cl->do_oop(p);
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166 }
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167 }
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168 }
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169 public:
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170 FilteringClosure(HeapWord* boundary, ExtendedOopClosure* cl) :
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171 ExtendedOopClosure(cl->_ref_processor), _boundary(boundary),
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172 _cl(cl) {}
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173 virtual void do_oop(oop* p);
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174 virtual void do_oop(narrowOop* p);
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175 inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); }
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176 inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); }
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177 virtual bool do_metadata() { return do_metadata_nv(); }
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178 inline bool do_metadata_nv() { assert(!_cl->do_metadata(), "assumption broken, must change to 'return _cl->do_metadata()'"); return false; }
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179 };
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180
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181 // Closure for scanning DefNewGeneration's weak references.
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182 // NOTE: very much like ScanClosure but not derived from
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183 // OopsInGenClosure -- weak references are processed all
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184 // at once, with no notion of which generation they were in.
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185 class ScanWeakRefClosure: public OopClosure {
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186 protected:
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187 DefNewGeneration* _g;
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188 HeapWord* _boundary;
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189 template <class T> inline void do_oop_work(T* p);
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190 public:
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191 ScanWeakRefClosure(DefNewGeneration* g);
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192 virtual void do_oop(oop* p);
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193 virtual void do_oop(narrowOop* p);
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194 inline void do_oop_nv(oop* p);
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195 inline void do_oop_nv(narrowOop* p);
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196 };
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197
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198 class VerifyOopClosure: public OopClosure {
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199 protected:
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200 template <class T> inline void do_oop_work(T* p) {
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201 oop obj = oopDesc::load_decode_heap_oop(p);
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202 guarantee(obj->is_oop_or_null(), err_msg("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj));
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203 }
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204 public:
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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 static VerifyOopClosure verify_oop;
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208 };
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209
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210 #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_HPP