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1 /*
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579
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2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class HeapRegion;
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26 class G1CollectedHeap;
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27 class G1RemSet;
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28 class HRInto_G1RemSet;
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29 class G1RemSet;
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30 class ConcurrentMark;
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31 class DirtyCardToOopClosure;
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32 class CMBitMap;
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33 class CMMarkStack;
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34 class G1ParScanThreadState;
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35
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36 // A class that scans oops in a given heap region (much as OopsInGenClosure
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37 // scans oops in a generation.)
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38 class OopsInHeapRegionClosure: public OopsInGenClosure {
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39 protected:
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40 HeapRegion* _from;
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41 public:
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42 virtual void set_region(HeapRegion* from) { _from = from; }
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43 };
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44
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45
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46 class G1ScanAndBalanceClosure : public OopClosure {
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47 G1CollectedHeap* _g1;
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48 static int _nq;
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49 public:
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50 G1ScanAndBalanceClosure(G1CollectedHeap* g1) : _g1(g1) { }
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51 inline void do_oop_nv(oop* p);
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52 inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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53 virtual void do_oop(oop* p);
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54 virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
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55 };
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56
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57 class G1ParClosureSuper : public OopsInHeapRegionClosure {
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58 protected:
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59 G1CollectedHeap* _g1;
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60 G1RemSet* _g1_rem;
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61 ConcurrentMark* _cm;
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62 G1ParScanThreadState* _par_scan_state;
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63 public:
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64 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);
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65 bool apply_to_weak_ref_discovered_field() { return true; }
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66 };
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67
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68 class G1ParScanClosure : public G1ParClosureSuper {
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69 public:
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70 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
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71 G1ParClosureSuper(g1, par_scan_state) { }
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72 void do_oop_nv(oop* p); // should be made inline
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73 inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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74 virtual void do_oop(oop* p) { do_oop_nv(p); }
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75 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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76 };
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77
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78 #define G1_PARTIAL_ARRAY_MASK 1
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79
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80 inline bool has_partial_array_mask(oop* ref) {
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81 return (intptr_t) ref & G1_PARTIAL_ARRAY_MASK;
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82 }
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83
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84 inline oop* set_partial_array_mask(oop obj) {
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85 return (oop*) ((intptr_t) obj | G1_PARTIAL_ARRAY_MASK);
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86 }
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87
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88 inline oop clear_partial_array_mask(oop* ref) {
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89 return oop((intptr_t) ref & ~G1_PARTIAL_ARRAY_MASK);
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90 }
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91
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92 class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
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93 G1ParScanClosure _scanner;
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94 template <class T> void process_array_chunk(oop obj, int start, int end);
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95 public:
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96 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
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97 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state) { }
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98 void do_oop_nv(oop* p);
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99 void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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100 virtual void do_oop(oop* p) { do_oop_nv(p); }
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101 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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102 };
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103
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104
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105 class G1ParCopyHelper : public G1ParClosureSuper {
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106 G1ParScanClosure *_scanner;
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107 protected:
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108 void mark_forwardee(oop* p);
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109 oop copy_to_survivor_space(oop obj);
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110 public:
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111 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
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112 G1ParScanClosure *scanner) :
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113 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }
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114 };
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115
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116 template<bool do_gen_barrier, G1Barrier barrier,
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117 bool do_mark_forwardee, bool skip_cset_test>
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118 class G1ParCopyClosure : public G1ParCopyHelper {
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119 G1ParScanClosure _scanner;
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120 void do_oop_work(oop* p);
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121 void do_oop_work(narrowOop* p) { guarantee(false, "NYI"); }
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122 public:
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123 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
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124 _scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { }
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125 inline void do_oop_nv(oop* p) {
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126 do_oop_work(p);
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127 if (do_mark_forwardee)
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128 mark_forwardee(p);
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129 }
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130 inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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131 virtual void do_oop(oop* p) { do_oop_nv(p); }
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132 virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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133 };
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134
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135 typedef G1ParCopyClosure<false, G1BarrierNone, false, false> G1ParScanExtRootClosure;
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136 typedef G1ParCopyClosure<true, G1BarrierNone, false, false> G1ParScanPermClosure;
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137 typedef G1ParCopyClosure<false, G1BarrierNone, true, false> G1ParScanAndMarkExtRootClosure;
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138 typedef G1ParCopyClosure<true, G1BarrierNone, true, false> G1ParScanAndMarkPermClosure;
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139 typedef G1ParCopyClosure<false, G1BarrierRS, false, false> G1ParScanHeapRSClosure;
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140 typedef G1ParCopyClosure<false, G1BarrierRS, true, false> G1ParScanAndMarkHeapRSClosure;
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141 // This is the only case when we set skip_cset_test. Basically, this
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142 // closure is (should?) only be called directly while we're draining
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143 // the overflow and task queues. In that case we know that the
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144 // reference in question points into the collection set, otherwise we
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145 // would not have pushed it on the queue.
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146 typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
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147 // We need a separate closure to handle references during evacuation
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148 // failure processing, as it cannot asume that the reference already
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149 // points to the collection set (like G1ParScanHeapEvacClosure does).
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150 typedef G1ParCopyClosure<false, G1BarrierEvac, false, false> G1ParScanHeapEvacFailureClosure;
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342
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151
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152 class FilterIntoCSClosure: public OopClosure {
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153 G1CollectedHeap* _g1;
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154 OopClosure* _oc;
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155 DirtyCardToOopClosure* _dcto_cl;
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156 public:
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157 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl,
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158 G1CollectedHeap* g1, OopClosure* oc) :
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159 _dcto_cl(dcto_cl), _g1(g1), _oc(oc)
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160 {}
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161 inline void do_oop_nv(oop* p);
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162 inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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163 virtual void do_oop(oop* p);
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164 virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
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165 bool apply_to_weak_ref_discovered_field() { return true; }
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166 bool do_header() { return false; }
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167 };
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168
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169 class FilterInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
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170 G1CollectedHeap* _g1;
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171 OopsInHeapRegionClosure* _oc;
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172 public:
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173 FilterInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
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174 OopsInHeapRegionClosure* oc) :
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175 _g1(g1), _oc(oc)
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176 {}
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177 inline void do_oop_nv(oop* p);
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178 inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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179 virtual void do_oop(oop* p);
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180 virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
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181 bool apply_to_weak_ref_discovered_field() { return true; }
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182 bool do_header() { return false; }
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183 void set_region(HeapRegion* from) {
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184 _oc->set_region(from);
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185 }
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186 };
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187
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188 class FilterAndMarkInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {
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189 G1CollectedHeap* _g1;
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190 ConcurrentMark* _cm;
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191 OopsInHeapRegionClosure* _oc;
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192 public:
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193 FilterAndMarkInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,
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194 OopsInHeapRegionClosure* oc,
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195 ConcurrentMark* cm)
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196 : _g1(g1), _oc(oc), _cm(cm) { }
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197
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198 inline void do_oop_nv(oop* p);
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199 inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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200 virtual void do_oop(oop* p);
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201 virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
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202 bool apply_to_weak_ref_discovered_field() { return true; }
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203 bool do_header() { return false; }
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204 void set_region(HeapRegion* from) {
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205 _oc->set_region(from);
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206 }
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207 };
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208
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209 class FilterOutOfRegionClosure: public OopClosure {
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210 HeapWord* _r_bottom;
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211 HeapWord* _r_end;
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212 OopClosure* _oc;
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213 int _out_of_region;
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214 public:
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215 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
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216 inline void do_oop_nv(oop* p);
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217 inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
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218 virtual void do_oop(oop* p);
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219 virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
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220 bool apply_to_weak_ref_discovered_field() { return true; }
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221 bool do_header() { return false; }
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222 int out_of_region() { return _out_of_region; }
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223 };
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