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annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 4787:2ace1c4ee8da

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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object). Reviewed-by: johnc, brutisso
author tonyp
date Tue, 10 Jan 2012 18:58:13 -0500
parents 811ec3d0833b
children d30fa85f9994
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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 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 G1ParClosureSuper(g1, par_scan_state) { }
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66
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67 template <class T> void do_oop_nv(T* p);
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68 virtual void do_oop(oop* p) { do_oop_nv(p); }
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69 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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70 };
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71
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72 class G1ParScanClosure : public G1ParClosureSuper {
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73 public:
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74 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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75 G1ParClosureSuper(g1, par_scan_state)
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76 {
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77 assert(_ref_processor == NULL, "sanity");
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78 _ref_processor = rp;
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79 }
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80
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81 template <class T> void do_oop_nv(T* p);
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82 virtual void do_oop(oop* p) { do_oop_nv(p); }
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83 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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84 };
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85
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86 #define G1_PARTIAL_ARRAY_MASK 0x2
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87
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88 template <class T> inline bool has_partial_array_mask(T* ref) {
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89 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
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90 }
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91
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92 template <class T> inline T* set_partial_array_mask(T obj) {
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93 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
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94 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
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95 }
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96
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97 template <class T> inline oop clear_partial_array_mask(T* ref) {
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98 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
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99 }
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100
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101 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
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102 G1ParScanClosure _scanner;
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103
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104 public:
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105 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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106 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp)
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107 {
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108 assert(_ref_processor == NULL, "sanity");
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109 }
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110
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111 G1ParScanClosure* scanner() {
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112 return &_scanner;
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113 }
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114
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115 template <class T> void do_oop_nv(T* p);
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116 virtual void do_oop(oop* p) { do_oop_nv(p); }
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117 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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118 };
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119
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120
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121 class G1ParCopyHelper : public G1ParClosureSuper {
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122 G1ParScanClosure *_scanner;
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123 protected:
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124 // Mark the object if it's not already marked. This is used to mark
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125 // objects pointed to by roots that are guaranteed not to move
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126 // during the GC (i.e., non-CSet objects). It is MT-safe.
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127 void mark_object(oop obj);
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128
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129 // Mark the object if it's not already marked. This is used to mark
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130 // objects pointed to by roots that have been forwarded during a
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131 // GC. It is MT-safe.
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132 void mark_forwarded_object(oop from_obj, oop to_obj);
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133
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134 oop copy_to_survivor_space(oop obj);
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135
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136 public:
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137 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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138 G1ParScanClosure *scanner) :
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139 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
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140 };
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141
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142 template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_object>
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143 class G1ParCopyClosure : public G1ParCopyHelper {
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144 G1ParScanClosure _scanner;
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145
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146 template <class T> void do_oop_work(T* p);
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147
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148 public:
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149 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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150 ReferenceProcessor* rp) :
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151 _scanner(g1, par_scan_state, rp),
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152 G1ParCopyHelper(g1, par_scan_state, &_scanner) {
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153 assert(_ref_processor == NULL, "sanity");
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154 }
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155
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156 G1ParScanClosure* scanner() { return &_scanner; }
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157
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158 template <class T> void do_oop_nv(T* p) {
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159 do_oop_work(p);
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160 }
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161 virtual void do_oop(oop* p) { do_oop_nv(p); }
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162 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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163 };
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164
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165 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;
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166 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure;
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167
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168 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
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169 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure;
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170
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171 // The following closure types are no longer used but are retained
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172 // for historical reasons:
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173 // typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure;
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174 // typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure;
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175
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176 // The following closure type is defined in g1_specialized_oop_closures.hpp:
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177 //
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178 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure;
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179
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180 // We use a separate closure to handle references during evacuation
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181 // failure processing.
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182 // We could have used another instance of G1ParScanHeapEvacClosure
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183 // (since that closure no longer assumes that the references it
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184 // handles point into the collection set).
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185
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186 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
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187
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188 class FilterIntoCSClosure: public OopClosure {
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189 G1CollectedHeap* _g1;
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190 OopClosure* _oc;
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191 DirtyCardToOopClosure* _dcto_cl;
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192 public:
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193 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
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194 G1CollectedHeap* g1,
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195 OopClosure* oc) :
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196 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }
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197
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198 template <class T> void do_oop_nv(T* p);
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199 virtual void do_oop(oop* p) { do_oop_nv(p); }
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200 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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201 bool apply_to_weak_ref_discovered_field() { return true; }
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202 bool do_header() { return false; }
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203 };
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204
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205 class FilterOutOfRegionClosure: public OopClosure {
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206 HeapWord* _r_bottom;
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207 HeapWord* _r_end;
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208 OopClosure* _oc;
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209 int _out_of_region;
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210 public:
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211 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
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212 template <class T> void do_oop_nv(T* p);
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213 virtual void do_oop(oop* p) { do_oop_nv(p); }
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214 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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215 bool apply_to_weak_ref_discovered_field() { return true; }
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216 bool do_header() { return false; }
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217 int out_of_region() { return _out_of_region; }
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218 };
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219
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220 // Closure for iterating over object fields during concurrent marking
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221 class G1CMOopClosure : public OopClosure {
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222 G1CollectedHeap* _g1h;
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223 ConcurrentMark* _cm;
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224 CMTask* _task;
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225 public:
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226 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
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227 template <class T> void do_oop_nv(T* p);
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228 virtual void do_oop( oop* p) { do_oop_nv(p); }
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229 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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230 };
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231
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232 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP