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annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 17844:8847586c9037

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8016302: Change type of the number of GC workers to unsigned int (2) Reviewed-by: tschatzl, jwilhelm
author vkempik
date Thu, 03 Apr 2014 17:49:31 +0400
parents bc22cbb8b45a
children 52b4284cb496 cd43876f692e
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1 /*
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2 * Copyright (c) 2001, 2014, 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 ExtendedOopClosure {
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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 G1ParScanThreadState* _par_scan_state;
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52 uint _worker_id;
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53 public:
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54 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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55 bool apply_to_weak_ref_discovered_field() { return true; }
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56 };
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57
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58 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
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59 public:
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60 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
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61 G1ParScanThreadState* par_scan_state):
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62 G1ParClosureSuper(g1, par_scan_state) { }
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63
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64 template <class T> void do_oop_nv(T* p);
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65 virtual void do_oop(oop* p) { do_oop_nv(p); }
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66 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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67 };
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68
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69 class G1ParScanClosure : public G1ParClosureSuper {
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70 public:
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71 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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72 G1ParClosureSuper(g1, par_scan_state)
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73 {
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74 assert(_ref_processor == NULL, "sanity");
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75 _ref_processor = rp;
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76 }
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77
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78 template <class T> void do_oop_nv(T* p);
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79 virtual void do_oop(oop* p) { do_oop_nv(p); }
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80 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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81 };
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82
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83 // Add back base class for metadata
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84 class G1ParCopyHelper : public G1ParClosureSuper {
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85 protected:
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86 Klass* _scanned_klass;
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87 ConcurrentMark* _cm;
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88
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89 // Mark the object if it's not already marked. This is used to mark
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90 // objects pointed to by roots that are guaranteed not to move
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91 // during the GC (i.e., non-CSet objects). It is MT-safe.
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92 void mark_object(oop obj);
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93
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94 // Mark the object if it's not already marked. This is used to mark
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95 // objects pointed to by roots that have been forwarded during a
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96 // GC. It is MT-safe.
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97 void mark_forwarded_object(oop from_obj, oop to_obj);
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98 public:
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99 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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100
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101 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
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102 template <class T> void do_klass_barrier(T* p, oop new_obj);
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103 };
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104
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105 template <G1Barrier barrier, bool do_mark_object>
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106 class G1ParCopyClosure : public G1ParCopyHelper {
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107 private:
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108 template <class T> void do_oop_work(T* p);
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109
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110 public:
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111 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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112 ReferenceProcessor* rp) :
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113 G1ParCopyHelper(g1, par_scan_state) {
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114 assert(_ref_processor == NULL, "sanity");
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115 }
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116
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117 template <class T> void do_oop_nv(T* p) { do_oop_work(p); }
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118 virtual void do_oop(oop* p) { do_oop_nv(p); }
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119 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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120 };
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121
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122 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure;
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123 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure;
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124
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125
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126 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
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127 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure;
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128
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129 // We use a separate closure to handle references during evacuation
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130 // failure processing.
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131
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132 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
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133
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134 class FilterIntoCSClosure: public ExtendedOopClosure {
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135 G1CollectedHeap* _g1;
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136 OopClosure* _oc;
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137 DirtyCardToOopClosure* _dcto_cl;
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138 public:
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139 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
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140 G1CollectedHeap* g1,
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141 OopClosure* oc) :
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142 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }
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143
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144 template <class T> void do_oop_nv(T* p);
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145 virtual void do_oop(oop* p) { do_oop_nv(p); }
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146 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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147 bool apply_to_weak_ref_discovered_field() { return true; }
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148 };
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149
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150 class FilterOutOfRegionClosure: public ExtendedOopClosure {
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151 HeapWord* _r_bottom;
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152 HeapWord* _r_end;
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153 OopClosure* _oc;
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154 public:
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155 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
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156 template <class T> void do_oop_nv(T* p);
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157 virtual void do_oop(oop* p) { do_oop_nv(p); }
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158 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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159 bool apply_to_weak_ref_discovered_field() { return true; }
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160 };
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161
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162 // Closure for iterating over object fields during concurrent marking
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163 class G1CMOopClosure : public ExtendedOopClosure {
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164 private:
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165 G1CollectedHeap* _g1h;
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166 ConcurrentMark* _cm;
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167 CMTask* _task;
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168 public:
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169 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
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170 template <class T> void do_oop_nv(T* p);
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171 virtual void do_oop( oop* p) { do_oop_nv(p); }
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172 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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173 };
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174
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175 // Closure to scan the root regions during concurrent marking
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176 class G1RootRegionScanClosure : public ExtendedOopClosure {
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177 private:
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178 G1CollectedHeap* _g1h;
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179 ConcurrentMark* _cm;
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180 uint _worker_id;
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181 public:
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182 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,
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183 uint worker_id) :
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184 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
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185 template <class T> void do_oop_nv(T* p);
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186 virtual void do_oop( oop* p) { do_oop_nv(p); }
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187 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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188 };
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189
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190 // Closure that applies the given two closures in sequence.
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191 // Used by the RSet refinement code (when updating RSets
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192 // during an evacuation pause) to record cards containing
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193 // pointers into the collection set.
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194
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195 class G1Mux2Closure : public ExtendedOopClosure {
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196 OopClosure* _c1;
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197 OopClosure* _c2;
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198 public:
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199 G1Mux2Closure(OopClosure *c1, OopClosure *c2);
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200 template <class T> void do_oop_nv(T* p);
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201 virtual void do_oop(oop* p) { do_oop_nv(p); }
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202 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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203 };
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204
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205 // A closure that returns true if it is actually applied
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206 // to a reference
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207
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208 class G1TriggerClosure : public ExtendedOopClosure {
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209 bool _triggered;
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210 public:
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211 G1TriggerClosure();
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212 bool triggered() const { return _triggered; }
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213 template <class T> void do_oop_nv(T* p);
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214 virtual void do_oop(oop* p) { do_oop_nv(p); }
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215 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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216 };
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217
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218 // A closure which uses a triggering closure to determine
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219 // whether to apply an oop closure.
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220
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221 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {
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222 G1TriggerClosure* _trigger_cl;
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223 OopClosure* _oop_cl;
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224 public:
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225 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);
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226 template <class T> void do_oop_nv(T* p);
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227 virtual void do_oop(oop* p) { do_oop_nv(p); }
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228 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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229 };
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230
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231 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
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232 G1CollectedHeap* _g1;
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233 G1RemSet* _g1_rem_set;
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234 HeapRegion* _from;
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235 OopsInHeapRegionClosure* _push_ref_cl;
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236 bool _record_refs_into_cset;
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237 uint _worker_i;
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238
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239 public:
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240 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
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241 G1RemSet* rs,
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242 OopsInHeapRegionClosure* push_ref_cl,
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243 bool record_refs_into_cset,
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244 uint worker_i = 0);
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245
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246 void set_from(HeapRegion* from) {
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247 assert(from != NULL, "from region must be non-NULL");
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248 _from = from;
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249 }
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250
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251 bool self_forwarded(oop obj) {
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252 bool result = (obj->is_forwarded() && (obj->forwardee()== obj));
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253 return result;
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254 }
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255
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256 bool apply_to_weak_ref_discovered_field() { return true; }
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257
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258 template <class T> void do_oop_nv(T* p);
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259 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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260 virtual void do_oop(oop* p) { do_oop_nv(p); }
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261 };
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262
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263 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP