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annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 14487:97300b6165f8

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8035329: Move G1ParCopyClosure::copy_to_survivor_space into G1ParScanThreadState Summary: Move G1ParCopyClosure::copy_to_survivor_space to decrease code size. Reviewed-by: stefank, jmasa
author tschatzl
date Mon, 24 Feb 2014 09:41:04 +0100
parents e9d5c28e5059
children 4ca6dc0799b6 bc22cbb8b45a
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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 #define G1_PARTIAL_ARRAY_MASK 0x2
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84
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85 inline bool has_partial_array_mask(oop* ref) {
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86 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
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87 }
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88
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89 // We never encode partial array oops as narrowOop*, so return false immediately.
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90 // This allows the compiler to create optimized code when popping references from
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91 // the work queue.
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92 inline bool has_partial_array_mask(narrowOop* ref) {
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93 assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*");
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94 return false;
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95 }
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96
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97 // Only implement set_partial_array_mask() for regular oops, not for narrowOops.
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98 // We always encode partial arrays as regular oop, to allow the
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99 // specialization for has_partial_array_mask() for narrowOops above.
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100 // This means that unintentional use of this method with narrowOops are caught
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101 // by the compiler.
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102 inline oop* set_partial_array_mask(oop obj) {
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103 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
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104 return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);
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105 }
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106
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107 template <class T> inline oop clear_partial_array_mask(T* ref) {
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108 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
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109 }
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110
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111 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
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112 G1ParScanClosure _scanner;
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113
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114 public:
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115 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) :
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116 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp)
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117 {
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118 assert(_ref_processor == NULL, "sanity");
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119 }
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120
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121 G1ParScanClosure* scanner() {
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122 return &_scanner;
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123 }
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124
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125 template <class T> void do_oop_nv(T* p);
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126 virtual void do_oop(oop* p) { do_oop_nv(p); }
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127 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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128 };
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129
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130 // Add back base class for metadata
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131 class G1ParCopyHelper : public G1ParClosureSuper {
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132 protected:
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133 Klass* _scanned_klass;
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134 ConcurrentMark* _cm;
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135
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136 // Mark the object if it's not already marked. This is used to mark
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137 // objects pointed to by roots that are guaranteed not to move
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138 // during the GC (i.e., non-CSet objects). It is MT-safe.
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139 void mark_object(oop obj);
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140
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141 // Mark the object if it's not already marked. This is used to mark
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142 // objects pointed to by roots that have been forwarded during a
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143 // GC. It is MT-safe.
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144 void mark_forwarded_object(oop from_obj, oop to_obj);
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145 public:
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146 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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147
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148 void set_scanned_klass(Klass* k) { _scanned_klass = k; }
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149 template <class T> void do_klass_barrier(T* p, oop new_obj);
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150 };
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151
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152 template <G1Barrier barrier, bool do_mark_object>
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153 class G1ParCopyClosure : public G1ParCopyHelper {
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154 private:
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155 template <class T> void do_oop_work(T* p);
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156
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157 public:
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158 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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159 ReferenceProcessor* rp) :
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160 G1ParCopyHelper(g1, par_scan_state) {
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161 assert(_ref_processor == NULL, "sanity");
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162 }
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163
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164 template <class T> void do_oop_nv(T* p) { do_oop_work(p); }
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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<G1BarrierNone, false> G1ParScanExtRootClosure;
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170 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure;
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171
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172
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173 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;
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174 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure;
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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<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<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;
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187
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188 class FilterIntoCSClosure: public ExtendedOopClosure {
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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 };
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203
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204 class FilterOutOfRegionClosure: public ExtendedOopClosure {
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205 HeapWord* _r_bottom;
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206 HeapWord* _r_end;
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207 OopClosure* _oc;
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208 public:
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209 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
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210 template <class T> void do_oop_nv(T* p);
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211 virtual void do_oop(oop* p) { do_oop_nv(p); }
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212 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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213 bool apply_to_weak_ref_discovered_field() { return true; }
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214 };
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215
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216 // Closure for iterating over object fields during concurrent marking
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217 class G1CMOopClosure : public ExtendedOopClosure {
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218 private:
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219 G1CollectedHeap* _g1h;
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220 ConcurrentMark* _cm;
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221 CMTask* _task;
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222 public:
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223 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task);
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224 template <class T> void do_oop_nv(T* p);
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225 virtual void do_oop( oop* p) { do_oop_nv(p); }
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226 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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227 };
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228
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229 // Closure to scan the root regions during concurrent marking
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230 class G1RootRegionScanClosure : public ExtendedOopClosure {
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231 private:
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232 G1CollectedHeap* _g1h;
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233 ConcurrentMark* _cm;
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234 uint _worker_id;
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235 public:
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236 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,
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237 uint worker_id) :
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238 _g1h(g1h), _cm(cm), _worker_id(worker_id) { }
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239 template <class T> void do_oop_nv(T* p);
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240 virtual void do_oop( oop* p) { do_oop_nv(p); }
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241 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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242 };
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243
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244 // Closure that applies the given two closures in sequence.
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245 // Used by the RSet refinement code (when updating RSets
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246 // during an evacuation pause) to record cards containing
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247 // pointers into the collection set.
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248
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249 class G1Mux2Closure : public ExtendedOopClosure {
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250 OopClosure* _c1;
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251 OopClosure* _c2;
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252 public:
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253 G1Mux2Closure(OopClosure *c1, OopClosure *c2);
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254 template <class T> void do_oop_nv(T* p);
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255 virtual void do_oop(oop* p) { do_oop_nv(p); }
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256 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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257 };
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258
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259 // A closure that returns true if it is actually applied
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260 // to a reference
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261
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262 class G1TriggerClosure : public ExtendedOopClosure {
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263 bool _triggered;
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264 public:
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265 G1TriggerClosure();
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266 bool triggered() const { return _triggered; }
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267 template <class T> void do_oop_nv(T* p);
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268 virtual void do_oop(oop* p) { do_oop_nv(p); }
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269 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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270 };
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271
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272 // A closure which uses a triggering closure to determine
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273 // whether to apply an oop closure.
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274
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275 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {
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276 G1TriggerClosure* _trigger_cl;
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277 OopClosure* _oop_cl;
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278 public:
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279 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);
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280 template <class T> void do_oop_nv(T* p);
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281 virtual void do_oop(oop* p) { do_oop_nv(p); }
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282 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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283 };
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284
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285 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {
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286 G1CollectedHeap* _g1;
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287 G1RemSet* _g1_rem_set;
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288 HeapRegion* _from;
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289 OopsInHeapRegionClosure* _push_ref_cl;
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290 bool _record_refs_into_cset;
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291 int _worker_i;
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292
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293 public:
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294 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
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295 G1RemSet* rs,
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296 OopsInHeapRegionClosure* push_ref_cl,
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297 bool record_refs_into_cset,
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298 int worker_i = 0);
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299
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300 void set_from(HeapRegion* from) {
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301 assert(from != NULL, "from region must be non-NULL");
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302 _from = from;
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303 }
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304
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305 bool self_forwarded(oop obj) {
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306 bool result = (obj->is_forwarded() && (obj->forwardee()== obj));
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307 return result;
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308 }
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309
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310 bool apply_to_weak_ref_discovered_field() { return true; }
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311
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312 template <class T> void do_oop_nv(T* p);
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313 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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314 virtual void do_oop(oop* p) { do_oop_nv(p); }
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315 };
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316
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317 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP