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annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 23472:047a642c9729

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8065579: WB method to start G1 concurrent mark cycle should be introduced Summary: Add a WhiteBox callback to the VM to start a concurrent mark cycle in G1. Reviewed-by: tschatzl, sjohanss Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
author kevinw
date Wed, 02 Dec 2015 13:58:34 +0530
parents ea47136e6ea4
children dd9cc155639c
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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 #include "memory/iterator.hpp"
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29 #include "oops/markOop.hpp"
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30
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31 class HeapRegion;
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32 class G1CollectedHeap;
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33 class G1RemSet;
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34 class ConcurrentMark;
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35 class DirtyCardToOopClosure;
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36 class CMBitMap;
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37 class CMMarkStack;
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38 class G1ParScanThreadState;
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39 class CMTask;
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40 class ReferenceProcessor;
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41
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42 // A class that scans oops in a given heap region (much as OopsInGenClosure
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43 // scans oops in a generation.)
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44 class OopsInHeapRegionClosure: public ExtendedOopClosure {
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45 protected:
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46 HeapRegion* _from;
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47 public:
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48 void set_region(HeapRegion* from) { _from = from; }
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49 };
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50
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51 class G1ParClosureSuper : public OopsInHeapRegionClosure {
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52 protected:
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53 G1CollectedHeap* _g1;
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54 G1ParScanThreadState* _par_scan_state;
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55 uint _worker_id;
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56 public:
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57 // Initializes the instance, leaving _par_scan_state uninitialized. Must be done
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58 // later using the set_par_scan_thread_state() method.
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59 G1ParClosureSuper(G1CollectedHeap* g1);
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60 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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61 bool apply_to_weak_ref_discovered_field() { return true; }
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62
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63 void set_par_scan_thread_state(G1ParScanThreadState* par_scan_state);
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64 };
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65
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66 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
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67 public:
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68 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
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69 G1ParScanThreadState* par_scan_state):
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70 G1ParClosureSuper(g1, par_scan_state) { }
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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, ReferenceProcessor* rp) :
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80 G1ParClosureSuper(g1) {
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81 assert(_ref_processor == NULL, "sanity");
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82 _ref_processor = rp;
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83 }
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84
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85 template <class T> void do_oop_nv(T* p);
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86 virtual void do_oop(oop* p) { do_oop_nv(p); }
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87 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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88 };
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89
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90 // Add back base class for metadata
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91 class G1ParCopyHelper : public G1ParClosureSuper {
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92 protected:
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93 Klass* _scanned_klass;
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94 ConcurrentMark* _cm;
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95
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96 // Mark the object if it's not already marked. This is used to mark
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97 // objects pointed to by roots that are guaranteed not to move
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98 // during the GC (i.e., non-CSet objects). It is MT-safe.
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99 void mark_object(oop obj);
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100
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101 // Mark the object if it's not already marked. This is used to mark
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102 // objects pointed to by roots that have been forwarded during a
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103 // GC. It is MT-safe.
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104 void mark_forwarded_object(oop from_obj, oop to_obj);
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105 public:
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106 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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107
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108 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
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109 template <class T> void do_klass_barrier(T* p, oop new_obj);
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110 };
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111
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112 template <G1Barrier barrier, G1Mark do_mark_object>
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113 class G1ParCopyClosure : public G1ParCopyHelper {
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114 private:
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115 template <class T> void do_oop_work(T* p);
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117 public:
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118 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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119 ReferenceProcessor* rp) :
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120 G1ParCopyHelper(g1, par_scan_state) {
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121 assert(_ref_processor == NULL, "sanity");
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122 }
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123
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124 template <class T> void do_oop_nv(T* p) { do_oop_work(p); }
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125 virtual void do_oop(oop* p) { do_oop_nv(p); }
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126 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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127
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128 G1CollectedHeap* g1() { return _g1; };
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129 G1ParScanThreadState* pss() { return _par_scan_state; }
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130 ReferenceProcessor* rp() { return _ref_processor; };
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131 };
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132
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133 typedef G1ParCopyClosure<G1BarrierNone, G1MarkNone> G1ParScanExtRootClosure;
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134 typedef G1ParCopyClosure<G1BarrierNone, G1MarkFromRoot> G1ParScanAndMarkExtRootClosure;
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135 typedef G1ParCopyClosure<G1BarrierNone, G1MarkPromotedFromRoot> G1ParScanAndMarkWeakExtRootClosure;
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136 // We use a separate closure to handle references during evacuation
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137 // failure processing.
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138
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139 typedef G1ParCopyClosure<G1BarrierEvac, G1MarkNone> G1ParScanHeapEvacFailureClosure;
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140
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141 class FilterIntoCSClosure: public ExtendedOopClosure {
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142 G1CollectedHeap* _g1;
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143 OopClosure* _oc;
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144 DirtyCardToOopClosure* _dcto_cl;
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145 public:
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146 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
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147 G1CollectedHeap* g1,
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148 OopClosure* oc) :
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149 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }
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150
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151 template <class T> void do_oop_nv(T* p);
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152 virtual void do_oop(oop* p) { do_oop_nv(p); }
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153 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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154 bool apply_to_weak_ref_discovered_field() { return true; }
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155 };
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156
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157 class FilterOutOfRegionClosure: public ExtendedOopClosure {
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158 HeapWord* _r_bottom;
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159 HeapWord* _r_end;
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160 OopClosure* _oc;
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161 public:
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162 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
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163 template <class T> void do_oop_nv(T* p);
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164 virtual void do_oop(oop* p) { do_oop_nv(p); }
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165 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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166 bool apply_to_weak_ref_discovered_field() { return true; }
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167 };
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168
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169 // Closure for iterating over object fields during concurrent marking
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170 class G1CMOopClosure : public MetadataAwareOopClosure {
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171 protected:
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172 ConcurrentMark* _cm;
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173 private:
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174 G1CollectedHeap* _g1h;
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175 CMTask* _task;
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176 public:
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177 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
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178 template <class T> void do_oop_nv(T* p);
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179 virtual void do_oop( oop* p) { do_oop_nv(p); }
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180 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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181 };
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182
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183 // Closure to scan the root regions during concurrent marking
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184 class G1RootRegionScanClosure : public MetadataAwareOopClosure {
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185 private:
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186 G1CollectedHeap* _g1h;
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187 ConcurrentMark* _cm;
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188 uint _worker_id;
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189 public:
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190 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,
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191 uint worker_id) :
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192 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
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193 template <class T> void do_oop_nv(T* p);
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194 virtual void do_oop( oop* p) { do_oop_nv(p); }
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195 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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196 };
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197
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198 // Closure that applies the given two closures in sequence.
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199 // Used by the RSet refinement code (when updating RSets
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200 // during an evacuation pause) to record cards containing
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201 // pointers into the collection set.
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202
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203 class G1Mux2Closure : public ExtendedOopClosure {
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204 OopClosure* _c1;
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205 OopClosure* _c2;
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206 public:
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207 G1Mux2Closure(OopClosure *c1, OopClosure *c2);
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208 template <class T> void do_oop_nv(T* p);
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209 virtual void do_oop(oop* p) { do_oop_nv(p); }
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210 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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211 };
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212
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213 // A closure that returns true if it is actually applied
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214 // to a reference
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215
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216 class G1TriggerClosure : public ExtendedOopClosure {
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217 bool _triggered;
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218 public:
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219 G1TriggerClosure();
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220 bool triggered() const { return _triggered; }
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221 template <class T> void do_oop_nv(T* p);
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222 virtual void do_oop(oop* p) { do_oop_nv(p); }
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223 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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224 };
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225
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226 // A closure which uses a triggering closure to determine
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227 // whether to apply an oop closure.
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228
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229 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {
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230 G1TriggerClosure* _trigger_cl;
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231 OopClosure* _oop_cl;
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232 public:
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233 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);
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234 template <class T> void do_oop_nv(T* p);
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235 virtual void do_oop(oop* p) { do_oop_nv(p); }
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236 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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237 };
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238
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239 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
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240 G1CollectedHeap* _g1;
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241 G1RemSet* _g1_rem_set;
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242 HeapRegion* _from;
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243 G1ParPushHeapRSClosure* _push_ref_cl;
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244 bool _record_refs_into_cset;
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245 uint _worker_i;
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246
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247 public:
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248 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
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249 G1RemSet* rs,
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250 G1ParPushHeapRSClosure* push_ref_cl,
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251 bool record_refs_into_cset,
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252 uint worker_i = 0);
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253
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254 void set_from(HeapRegion* from) {
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255 assert(from != NULL, "from region must be non-NULL");
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256 _from = from;
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257 }
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258
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259 bool self_forwarded(oop obj) {
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260 markOop m = obj->mark();
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261 bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj));
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262 return result;
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263 }
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264
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265 bool apply_to_weak_ref_discovered_field() { return true; }
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266
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267 template <class T> void do_oop_nv(T* p);
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268 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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269 virtual void do_oop(oop* p) { do_oop_nv(p); }
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270 };
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271
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272 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP