1 /* 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP 27 28 class HeapRegion; 29 class G1CollectedHeap; 30 class G1RemSet; 31 class ConcurrentMark; 32 class DirtyCardToOopClosure; 33 class CMBitMap; 34 class CMMarkStack; 35 class G1ParScanThreadState; 36 class CMTask; 37 class ReferenceProcessor; 38 39 // A class that scans oops in a given heap region (much as OopsInGenClosure 40 // scans oops in a generation.) 41 class OopsInHeapRegionClosure: public OopsInGenClosure { 42 protected: 43 HeapRegion* _from; 44 public: 45 void set_region(HeapRegion* from) { _from = from; } 46 }; 47 48 class G1ParClosureSuper : public OopsInHeapRegionClosure { 49 protected: 50 G1CollectedHeap* _g1; 51 G1RemSet* _g1_rem; 52 ConcurrentMark* _cm; 53 G1ParScanThreadState* _par_scan_state; 54 bool _during_initial_mark; 55 bool _mark_in_progress; 56 public: 57 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 58 bool apply_to_weak_ref_discovered_field() { return true; } 59 }; 60 61 class G1ParPushHeapRSClosure : public G1ParClosureSuper { 62 public: 63 G1ParPushHeapRSClosure(G1CollectedHeap* g1, 64 G1ParScanThreadState* par_scan_state, 65 ReferenceProcessor* rp) : 66 G1ParClosureSuper(g1, par_scan_state) 67 { 68 assert(_ref_processor == NULL, "sanity"); 69 _ref_processor = rp; 70 } 71 72 template <class T> void do_oop_nv(T* p); 73 virtual void do_oop(oop* p) { do_oop_nv(p); } 74 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 75 }; 76 77 class G1ParScanClosure : public G1ParClosureSuper { 78 public: 79 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : 80 G1ParClosureSuper(g1, par_scan_state) 81 { 82 assert(_ref_processor == NULL, "sanity"); 83 _ref_processor = rp; 84 } 85 86 template <class T> void do_oop_nv(T* p); 87 virtual void do_oop(oop* p) { do_oop_nv(p); } 88 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 89 }; 90 91 #define G1_PARTIAL_ARRAY_MASK 0x2 92 93 template <class T> inline bool has_partial_array_mask(T* ref) { 94 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; 95 } 96 97 template <class T> inline T* set_partial_array_mask(T obj) { 98 assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); 99 return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK); 100 } 101 102 template <class T> inline oop clear_partial_array_mask(T* ref) { 103 return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); 104 } 105 106 class G1ParScanPartialArrayClosure : public G1ParClosureSuper { 107 G1ParScanClosure _scanner; 108 109 public: 110 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : 111 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp) 112 { 113 assert(_ref_processor == NULL, "sanity"); 114 } 115 116 G1ParScanClosure* scanner() { 117 return &_scanner; 118 } 119 120 template <class T> void do_oop_nv(T* p); 121 virtual void do_oop(oop* p) { do_oop_nv(p); } 122 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 123 }; 124 125 126 class G1ParCopyHelper : public G1ParClosureSuper { 127 G1ParScanClosure *_scanner; 128 protected: 129 template <class T> void mark_object(T* p); 130 oop copy_to_survivor_space(oop obj, bool should_mark_root, 131 bool should_mark_copy); 132 public: 133 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, 134 G1ParScanClosure *scanner) : 135 G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { } 136 }; 137 138 template<bool do_gen_barrier, G1Barrier barrier, 139 bool do_mark_object> 140 class G1ParCopyClosure : public G1ParCopyHelper { 141 G1ParScanClosure _scanner; 142 143 template <class T> void do_oop_work(T* p); 144 145 public: 146 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, 147 ReferenceProcessor* rp) : 148 _scanner(g1, par_scan_state, rp), 149 G1ParCopyHelper(g1, par_scan_state, &_scanner) 150 { 151 assert(_ref_processor == NULL, "sanity"); 152 } 153 154 G1ParScanClosure* scanner() { return &_scanner; } 155 156 template <class T> void do_oop_nv(T* p) { 157 do_oop_work(p); 158 } 159 virtual void do_oop(oop* p) { do_oop_nv(p); } 160 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 161 }; 162 163 typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure; 164 typedef G1ParCopyClosure<true, G1BarrierNone, false> G1ParScanPermClosure; 165 166 typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; 167 typedef G1ParCopyClosure<true, G1BarrierNone, true> G1ParScanAndMarkPermClosure; 168 169 // The following closure types are no longer used but are retained 170 // for historical reasons: 171 // typedef G1ParCopyClosure<false, G1BarrierRS, false> G1ParScanHeapRSClosure; 172 // typedef G1ParCopyClosure<false, G1BarrierRS, true> G1ParScanAndMarkHeapRSClosure; 173 174 // The following closure type is defined in g1_specialized_oop_closures.hpp: 175 // 176 // typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacClosure; 177 178 // We use a separate closure to handle references during evacuation 179 // failure processing. 180 // We could have used another instance of G1ParScanHeapEvacClosure 181 // (since that closure no longer assumes that the references it 182 // handles point into the collection set). 183 184 typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; 185 186 class FilterIntoCSClosure: public OopClosure { 187 G1CollectedHeap* _g1; 188 OopClosure* _oc; 189 DirtyCardToOopClosure* _dcto_cl; 190 public: 191 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, 192 G1CollectedHeap* g1, 193 OopClosure* oc, 194 ReferenceProcessor* rp) : 195 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) 196 { 197 assert(_ref_processor == NULL, "sanity"); 198 _ref_processor = rp; 199 } 200 201 template <class T> void do_oop_nv(T* p); 202 virtual void do_oop(oop* p) { do_oop_nv(p); } 203 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 204 bool apply_to_weak_ref_discovered_field() { return true; } 205 bool do_header() { return false; } 206 }; 207 208 class FilterOutOfRegionClosure: public OopClosure { 209 HeapWord* _r_bottom; 210 HeapWord* _r_end; 211 OopClosure* _oc; 212 int _out_of_region; 213 public: 214 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); 215 template <class T> void do_oop_nv(T* p); 216 virtual void do_oop(oop* p) { do_oop_nv(p); } 217 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 218 bool apply_to_weak_ref_discovered_field() { return true; } 219 bool do_header() { return false; } 220 int out_of_region() { return _out_of_region; } 221 }; 222 223 // Closure for iterating over object fields during concurrent marking 224 class G1CMOopClosure : public OopClosure { 225 G1CollectedHeap* _g1h; 226 ConcurrentMark* _cm; 227 CMTask* _task; 228 public: 229 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); 230 template <class T> void do_oop_nv(T* p); 231 virtual void do_oop( oop* p) { do_oop_nv(p); } 232 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 233 }; 234 235 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP