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annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 3979:4dfb2df418f2

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6484982: G1: process references during evacuation pauses Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate. Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
author johnc
date Thu, 22 Sep 2011 10:57:37 -0700
parents 663cb89032b1
children 811ec3d0833b
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1 /*
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2 * Copyright (c) 2001, 2011, 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_G1_G1OOPCLOSURES_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP
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27
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28 class HeapRegion;
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29 class G1CollectedHeap;
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30 class G1RemSet;
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31 class ConcurrentMark;
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32 class DirtyCardToOopClosure;
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33 class CMBitMap;
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34 class CMMarkStack;
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35 class G1ParScanThreadState;
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36 class CMTask;
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37 class ReferenceProcessor;
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38
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39 // A class that scans oops in a given heap region (much as OopsInGenClosure
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40 // scans oops in a generation.)
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41 class OopsInHeapRegionClosure: public OopsInGenClosure {
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42 protected:
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43 HeapRegion* _from;
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44 public:
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45 void set_region(HeapRegion* from) { _from = from; }
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46 };
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47
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48 class G1ParClosureSuper : public OopsInHeapRegionClosure {
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49 protected:
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50 G1CollectedHeap* _g1;
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51 G1RemSet* _g1_rem;
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52 ConcurrentMark* _cm;
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53 G1ParScanThreadState* _par_scan_state;
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54 bool _during_initial_mark;
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55 bool _mark_in_progress;
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56 public:
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57 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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58 bool apply_to_weak_ref_discovered_field() { return true; }
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59 };
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60
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61 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
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62 public:
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63 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
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64 G1ParScanThreadState* par_scan_state,
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65 ReferenceProcessor* rp) :
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66 G1ParClosureSuper(g1, par_scan_state)
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67 {
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68 assert(_ref_processor == NULL, "sanity");
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69 _ref_processor = rp;
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70 }
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71
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72 template <class T> void do_oop_nv(T* p);
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73 virtual void do_oop(oop* p) { do_oop_nv(p); }
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74 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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75 };
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76
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77 class G1ParScanClosure : public G1ParClosureSuper {
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78 public:
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79 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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80 G1ParClosureSuper(g1, par_scan_state)
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81 {
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82 assert(_ref_processor == NULL, "sanity");
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83 _ref_processor = rp;
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84 }
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85
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86 template <class T> void do_oop_nv(T* p);
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87 virtual void do_oop(oop* p) { do_oop_nv(p); }
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88 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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89 };
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90
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91 #define G1_PARTIAL_ARRAY_MASK 0x2
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92
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93 template <class T> inline bool has_partial_array_mask(T* ref) {
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94 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
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95 }
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96
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97 template <class T> inline T* set_partial_array_mask(T obj) {
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98 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
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99 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
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100 }
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101
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102 template <class T> inline oop clear_partial_array_mask(T* ref) {
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103 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
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104 }
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105
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106 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
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107 G1ParScanClosure _scanner;
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108
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109 public:
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110 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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111 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp)
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112 {
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113 assert(_ref_processor == NULL, "sanity");
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114 }
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115
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116 G1ParScanClosure* scanner() {
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117 return &_scanner;
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118 }
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119
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120 template <class T> void do_oop_nv(T* p);
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121 virtual void do_oop(oop* p) { do_oop_nv(p); }
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122 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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123 };
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125
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126 class G1ParCopyHelper : public G1ParClosureSuper {
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127 G1ParScanClosure *_scanner;
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128 protected:
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129 template <class T> void mark_object(T* p);
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130 oop copy_to_survivor_space(oop obj, bool should_mark_root,
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131 bool should_mark_copy);
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132 public:
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133 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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134 G1ParScanClosure *scanner) :
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135 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
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136 };
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137
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138 template<bool do_gen_barrier, G1Barrier barrier,
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139 bool do_mark_object>
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140 class G1ParCopyClosure : public G1ParCopyHelper {
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141 G1ParScanClosure _scanner;
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142
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143 template <class T> void do_oop_work(T* p);
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144
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145 public:
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146 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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147 ReferenceProcessor* rp) :
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148 _scanner(g1, par_scan_state, rp),
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149 G1ParCopyHelper(g1, par_scan_state, &_scanner)
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150 {
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151 assert(_ref_processor == NULL, "sanity");
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152 }
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153
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154 G1ParScanClosure* scanner() { return &_scanner; }
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155
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156 template <class T> void do_oop_nv(T* p) {
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157 do_oop_work(p);
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158 }
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159 virtual void do_oop(oop* p) { do_oop_nv(p); }
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160 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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161 };
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162
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163 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
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164 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure;
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165
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166 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
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167 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure;
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168
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169 // The following closure types are no longer used but are retained
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170 // for historical reasons:
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171 // typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
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172 // typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
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173
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174 // The following closure type is defined in g1_specialized_oop_closures.hpp:
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175 //
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176 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure;
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177
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178 // We use a separate closure to handle references during evacuation
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179 // failure processing.
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180 // We could have used another instance of G1ParScanHeapEvacClosure
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181 // (since that closure no longer assumes that the references it
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182 // handles point into the collection set).
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183
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184 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
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185
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186 class FilterIntoCSClosure: public OopClosure {
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187 G1CollectedHeap* _g1;
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188 OopClosure* _oc;
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189 DirtyCardToOopClosure* _dcto_cl;
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190 public:
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191 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
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192 G1CollectedHeap* g1,
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193 OopClosure* oc,
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194 ReferenceProcessor* rp) :
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195 _dcto_cl(dcto_cl), _g1(g1), _oc(oc)
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196 {
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197 assert(_ref_processor == NULL, "sanity");
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198 _ref_processor = rp;
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199 }
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200
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201 template <class T> void do_oop_nv(T* p);
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202 virtual void do_oop(oop* p) { do_oop_nv(p); }
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203 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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204 bool apply_to_weak_ref_discovered_field() { return true; }
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205 bool do_header() { return false; }
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206 };
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207
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208 class FilterOutOfRegionClosure: public OopClosure {
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209 HeapWord* _r_bottom;
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210 HeapWord* _r_end;
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211 OopClosure* _oc;
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212 int _out_of_region;
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213 public:
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214 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
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215 template <class T> void do_oop_nv(T* p);
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216 virtual void do_oop(oop* p) { do_oop_nv(p); }
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217 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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218 bool apply_to_weak_ref_discovered_field() { return true; }
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219 bool do_header() { return false; }
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220 int out_of_region() { return _out_of_region; }
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221 };
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222
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223 // Closure for iterating over object fields during concurrent marking
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224 class G1CMOopClosure : public OopClosure {
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225 G1CollectedHeap* _g1h;
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226 ConcurrentMark* _cm;
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227 CMTask* _task;
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228 public:
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229 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
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230 template <class T> void do_oop_nv(T* p);
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231 virtual void do_oop( oop* p) { do_oop_nv(p); }
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232 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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233 };
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234
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235 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP