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annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 8733:9def4075da6d

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8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate(). Reviewed-by: johnc, ysr Contributed-by: tamao <tao.mao@oracle.com>
author tamao
date Tue, 05 Mar 2013 15:36:56 -0800
parents da91efe96a93
children 190899198332
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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_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 uint _worker_id;
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55 bool _during_initial_mark;
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56 bool _mark_in_progress;
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57 public:
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58 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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59 bool apply_to_weak_ref_discovered_field() { return true; }
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60 };
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61
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62 class G1ParPushHeapRSClosure : public G1ParClosureSuper {
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63 public:
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64 G1ParPushHeapRSClosure(G1CollectedHeap* g1,
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65 G1ParScanThreadState* par_scan_state):
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66 G1ParClosureSuper(g1, par_scan_state) { }
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67
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68 template <class T> void do_oop_nv(T* p);
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69 virtual void do_oop(oop* p) { do_oop_nv(p); }
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70 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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71 };
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72
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73 class G1ParScanClosure : public G1ParClosureSuper {
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74 public:
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75 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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76 G1ParClosureSuper(g1, par_scan_state)
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77 {
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78 assert(_ref_processor == NULL, "sanity");
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79 _ref_processor = rp;
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80 }
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81
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82 template <class T> void do_oop_nv(T* p);
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83 virtual void do_oop(oop* p) { do_oop_nv(p); }
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84 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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85 };
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86
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87 #define G1_PARTIAL_ARRAY_MASK 0x2
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88
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89 template <class T> inline bool has_partial_array_mask(T* ref) {
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90 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
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91 }
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92
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93 template <class T> inline T* set_partial_array_mask(T obj) {
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94 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
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95 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
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96 }
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97
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98 template <class T> inline oop clear_partial_array_mask(T* ref) {
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99 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
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100 }
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101
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102 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
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103 G1ParScanClosure _scanner;
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104
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105 public:
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106 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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107 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp)
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108 {
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109 assert(_ref_processor == NULL, "sanity");
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110 }
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111
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112 G1ParScanClosure* scanner() {
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113 return &_scanner;
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114 }
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115
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116 template <class T> void do_oop_nv(T* p);
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117 virtual void do_oop(oop* p) { do_oop_nv(p); }
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118 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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119 };
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120
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121 // Add back base class for metadata
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122 class G1ParCopyHelper : public G1ParClosureSuper {
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123 Klass* _scanned_klass;
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124
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125 public:
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126 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
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127 _scanned_klass(NULL),
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128 G1ParClosureSuper(g1, par_scan_state) {}
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129
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130 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
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131 template <class T> void do_klass_barrier(T* p, oop new_obj);
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132 };
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133
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134 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object>
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135 class G1ParCopyClosure : public G1ParCopyHelper {
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136 G1ParScanClosure _scanner;
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137 template <class T> void do_oop_work(T* p);
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138
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139 protected:
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140 // Mark the object if it's not already marked. This is used to mark
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141 // objects pointed to by roots that are guaranteed not to move
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142 // during the GC (i.e., non-CSet objects). It is MT-safe.
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143 void mark_object(oop obj);
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144
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145 // Mark the object if it's not already marked. This is used to mark
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146 // objects pointed to by roots that have been forwarded during a
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147 // GC. It is MT-safe.
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148 void mark_forwarded_object(oop from_obj, oop to_obj);
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149
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150 oop copy_to_survivor_space(oop obj);
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151
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152 public:
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153 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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154 ReferenceProcessor* rp) :
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155 _scanner(g1, par_scan_state, rp),
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156 G1ParCopyHelper(g1, par_scan_state) {
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157 assert(_ref_processor == NULL, "sanity");
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158 }
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159
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160 G1ParScanClosure* scanner() { return &_scanner; }
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161
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162 template <class T> void do_oop_nv(T* p) {
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163 do_oop_work(p);
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164 }
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165 virtual void do_oop(oop* p) { do_oop_nv(p); }
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166 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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167 };
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168
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169 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
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170 typedef G1ParCopyClosure<false, G1BarrierKlass, false> G1ParScanMetadataClosure;
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171
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172
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173 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
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174 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkClosure;
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175 typedef G1ParCopyClosure<false, G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure;
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176
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177 // The following closure types are no longer used but are retained
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178 // for historical reasons:
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179 // typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
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180 // typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
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181
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182 // The following closure type is defined in g1_specialized_oop_closures.hpp:
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183 //
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184 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure;
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185
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186 // We use a separate closure to handle references during evacuation
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187 // failure processing.
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188 // We could have used another instance of G1ParScanHeapEvacClosure
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189 // (since that closure no longer assumes that the references it
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190 // handles point into the collection set).
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191
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192 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
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193
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194 class FilterIntoCSClosure: public ExtendedOopClosure {
342
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195 G1CollectedHeap* _g1;
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196 OopClosure* _oc;
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197 DirtyCardToOopClosure* _dcto_cl;
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198 public:
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199 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
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200 G1CollectedHeap* g1,
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201 OopClosure* oc) :
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202 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }
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203
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204 template <class T> void do_oop_nv(T* p);
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205 virtual void do_oop(oop* p) { do_oop_nv(p); }
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206 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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207 bool apply_to_weak_ref_discovered_field() { return true; }
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208 };
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209
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210 class FilterOutOfRegionClosure: public ExtendedOopClosure {
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211 HeapWord* _r_bottom;
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212 HeapWord* _r_end;
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213 OopClosure* _oc;
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214 public:
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215 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
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216 template <class T> void do_oop_nv(T* p);
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217 virtual void do_oop(oop* p) { do_oop_nv(p); }
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218 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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219 bool apply_to_weak_ref_discovered_field() { return true; }
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220 };
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221
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222 // Closure for iterating over object fields during concurrent marking
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223 class G1CMOopClosure : public ExtendedOopClosure {
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224 private:
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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 // Closure to scan the root regions during concurrent marking
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236 class G1RootRegionScanClosure : public ExtendedOopClosure {
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237 private:
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238 G1CollectedHeap* _g1h;
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239 ConcurrentMark* _cm;
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240 uint _worker_id;
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241 public:
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242 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,
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243 uint worker_id) :
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244 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
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245 template <class T> void do_oop_nv(T* p);
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246 virtual void do_oop( oop* p) { do_oop_nv(p); }
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247 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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248 };
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249
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250 // Closure that applies the given two closures in sequence.
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251 // Used by the RSet refinement code (when updating RSets
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252 // during an evacuation pause) to record cards containing
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253 // pointers into the collection set.
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254
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255 class G1Mux2Closure : public ExtendedOopClosure {
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256 OopClosure* _c1;
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257 OopClosure* _c2;
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258 public:
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259 G1Mux2Closure(OopClosure *c1, OopClosure *c2);
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260 template <class T> void do_oop_nv(T* p);
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261 virtual void do_oop(oop* p) { do_oop_nv(p); }
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262 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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263 };
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264
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265 // A closure that returns true if it is actually applied
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266 // to a reference
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267
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268 class G1TriggerClosure : public ExtendedOopClosure {
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269 bool _triggered;
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270 public:
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271 G1TriggerClosure();
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272 bool triggered() const { return _triggered; }
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273 template <class T> void do_oop_nv(T* p);
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274 virtual void do_oop(oop* p) { do_oop_nv(p); }
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275 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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276 };
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277
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278 // A closure which uses a triggering closure to determine
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279 // whether to apply an oop closure.
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280
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281 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {
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282 G1TriggerClosure* _trigger_cl;
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283 OopClosure* _oop_cl;
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284 public:
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285 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);
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286 template <class T> void do_oop_nv(T* p);
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287 virtual void do_oop(oop* p) { do_oop_nv(p); }
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288 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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289 };
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290
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291 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
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292 G1CollectedHeap* _g1;
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293 G1RemSet* _g1_rem_set;
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294 HeapRegion* _from;
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295 OopsInHeapRegionClosure* _push_ref_cl;
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296 bool _record_refs_into_cset;
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297 int _worker_i;
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298
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299 public:
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300 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
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301 G1RemSet* rs,
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302 OopsInHeapRegionClosure* push_ref_cl,
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303 bool record_refs_into_cset,
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304 int worker_i = 0);
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305
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306 void set_from(HeapRegion* from) {
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307 assert(from != NULL, "from region must be non-NULL");
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308 _from = from;
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309 }
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310
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311 bool self_forwarded(oop obj) {
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312 bool result = (obj->is_forwarded() && (obj->forwardee()== obj));
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313 return result;
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314 }
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315
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316 bool apply_to_weak_ref_discovered_field() { return true; }
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317
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318 template <class T> void do_oop_nv(T* p);
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319 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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320 virtual void do_oop(oop* p) { do_oop_nv(p); }
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321 };
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322
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323 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP