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1 /* |
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2 * Copyright (c) 2001, 2016, 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_SHARED_GENOOPCLOSURES_HPP |
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26 #define SHARE_VM_GC_SHARED_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 // Closure for iterating roots from a particular generation |
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39 // Note: all classes deriving from this MUST call this do_barrier |
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40 // method at the end of their own do_oop method! |
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41 // Note: no do_oop defined, this is an abstract class. |
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42 |
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43 class OopsInGenClosure : public ExtendedOopClosure { |
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44 private: |
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45 Generation* _orig_gen; // generation originally set in ctor |
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46 Generation* _gen; // generation being scanned |
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47 |
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48 protected: |
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49 // Some subtypes need access. |
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50 HeapWord* _gen_boundary; // start of generation |
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51 CardTableRS* _rs; // remembered set |
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52 |
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53 // For assertions |
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54 Generation* generation() { return _gen; } |
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55 CardTableRS* rs() { return _rs; } |
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56 |
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57 // Derived classes that modify oops so that they might be old-to-young |
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58 // pointers must call the method below. |
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59 template <class T> void do_barrier(T* p); |
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60 |
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61 // Version for use by closures that may be called in parallel code. |
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62 template <class T> void par_do_barrier(T* p); |
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63 |
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64 public: |
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65 OopsInGenClosure() : ExtendedOopClosure(NULL), |
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66 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; |
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67 |
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68 OopsInGenClosure(Generation* gen); |
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69 void set_generation(Generation* gen); |
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70 |
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71 void reset_generation() { _gen = _orig_gen; } |
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72 |
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73 // Problem with static closures: must have _gen_boundary set at some point, |
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74 // but cannot do this until after the heap is initialized. |
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75 void set_orig_generation(Generation* gen) { |
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76 _orig_gen = gen; |
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77 set_generation(gen); |
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78 } |
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79 |
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80 HeapWord* gen_boundary() { return _gen_boundary; } |
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81 |
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82 }; |
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83 |
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84 // Super class for scan closures. It contains code to dirty scanned Klasses. |
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85 class OopsInKlassOrGenClosure: public OopsInGenClosure { |
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86 Klass* _scanned_klass; |
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87 public: |
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88 OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {} |
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89 void set_scanned_klass(Klass* k) { |
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90 assert(k == NULL || _scanned_klass == NULL, "Must be"); |
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91 _scanned_klass = k; |
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92 } |
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93 bool is_scanning_a_klass() { return _scanned_klass != NULL; } |
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94 void do_klass_barrier(); |
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95 }; |
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96 |
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97 // Closure for scanning DefNewGeneration. |
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98 // |
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99 // This closure will perform barrier store calls for ALL |
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100 // pointers in scanned oops. |
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101 class ScanClosure: public OopsInKlassOrGenClosure { |
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102 protected: |
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103 DefNewGeneration* _g; |
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104 HeapWord* _boundary; |
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105 bool _gc_barrier; |
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106 template <class T> inline void do_oop_work(T* p); |
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107 public: |
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108 ScanClosure(DefNewGeneration* g, bool gc_barrier); |
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109 virtual void do_oop(oop* p); |
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110 virtual void do_oop(narrowOop* p); |
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111 inline void do_oop_nv(oop* p); |
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112 inline void do_oop_nv(narrowOop* p); |
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113 }; |
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114 |
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115 // Closure for scanning DefNewGeneration. |
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116 // |
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117 // This closure only performs barrier store calls on |
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118 // pointers into the DefNewGeneration. This is less |
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119 // precise, but faster, than a ScanClosure |
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120 class FastScanClosure: public OopsInKlassOrGenClosure { |
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121 protected: |
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122 DefNewGeneration* _g; |
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123 HeapWord* _boundary; |
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124 bool _gc_barrier; |
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125 template <class T> inline void do_oop_work(T* p); |
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126 public: |
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127 FastScanClosure(DefNewGeneration* g, bool gc_barrier); |
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128 virtual void do_oop(oop* p); |
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129 virtual void do_oop(narrowOop* p); |
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130 inline void do_oop_nv(oop* p); |
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131 inline void do_oop_nv(narrowOop* p); |
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132 }; |
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133 |
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134 class KlassScanClosure: public KlassClosure { |
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135 OopsInKlassOrGenClosure* _scavenge_closure; |
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136 // true if the the modified oops state should be saved. |
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137 bool _accumulate_modified_oops; |
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138 public: |
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139 KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure, |
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140 KlassRemSet* klass_rem_set_policy); |
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141 void do_klass(Klass* k); |
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142 }; |
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143 |
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144 class FilteringClosure: public ExtendedOopClosure { |
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145 private: |
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146 HeapWord* _boundary; |
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147 ExtendedOopClosure* _cl; |
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148 protected: |
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149 template <class T> inline void do_oop_work(T* p); |
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150 public: |
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151 FilteringClosure(HeapWord* boundary, ExtendedOopClosure* cl) : |
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152 ExtendedOopClosure(cl->ref_processor()), _boundary(boundary), |
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153 _cl(cl) {} |
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154 virtual void do_oop(oop* p); |
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155 virtual void do_oop(narrowOop* p); |
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156 inline void do_oop_nv(oop* p); |
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157 inline void do_oop_nv(narrowOop* p); |
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158 virtual bool do_metadata() { return do_metadata_nv(); } |
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159 inline bool do_metadata_nv() { assert(!_cl->do_metadata(), "assumption broken, must change to 'return _cl->do_metadata()'"); return false; } |
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160 }; |
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161 |
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162 // Closure for scanning DefNewGeneration's weak references. |
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163 // NOTE: very much like ScanClosure but not derived from |
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164 // OopsInGenClosure -- weak references are processed all |
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165 // at once, with no notion of which generation they were in. |
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166 class ScanWeakRefClosure: public OopClosure { |
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167 protected: |
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168 DefNewGeneration* _g; |
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169 HeapWord* _boundary; |
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170 template <class T> inline void do_oop_work(T* p); |
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171 public: |
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172 ScanWeakRefClosure(DefNewGeneration* g); |
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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); |
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176 inline void do_oop_nv(narrowOop* p); |
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177 }; |
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178 |
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179 #endif // SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP |