1 /* 2 * Copyright (c) 2001, 2017, 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_G1_G1OOPCLOSURES_HPP 26 #define SHARE_VM_GC_G1_G1OOPCLOSURES_HPP 27 28 #include "memory/iterator.hpp" 29 #include "oops/markOop.hpp" 30 31 class HeapRegion; 32 class G1CollectedHeap; 33 class G1RemSet; 34 class G1ConcurrentMark; 35 class DirtyCardToOopClosure; 36 class G1CMBitMap; 37 class G1ParScanThreadState; 38 class G1CMTask; 39 class ReferenceProcessor; 40 41 // A class that scans oops in a given heap region (much as OopsInGenClosure 42 // scans oops in a generation.) 43 class OopsInHeapRegionClosure: public ExtendedOopClosure { 44 protected: 45 HeapRegion* _from; 46 public: 47 void set_region(HeapRegion* from) { _from = from; } 48 }; 49 50 class G1ParClosureSuper : public OopsInHeapRegionClosure { 51 protected: 52 G1CollectedHeap* _g1; 53 G1ParScanThreadState* _par_scan_state; 54 55 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 56 ~G1ParClosureSuper() { } 57 58 public: 59 virtual bool apply_to_weak_ref_discovered_field() { return true; } 60 }; 61 62 class G1ParPushHeapRSClosure : public G1ParClosureSuper { 63 public: 64 G1ParPushHeapRSClosure(G1CollectedHeap* g1, 65 G1ParScanThreadState* par_scan_state): 66 G1ParClosureSuper(g1, par_scan_state) { } 67 68 template <class T> void do_oop_nv(T* p); 69 virtual void do_oop(oop* p) { do_oop_nv(p); } 70 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 71 }; 72 73 class G1ParScanClosure : public G1ParClosureSuper { 74 public: 75 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 76 G1ParClosureSuper(g1, par_scan_state) { } 77 78 template <class T> void do_oop_nv(T* p); 79 virtual void do_oop(oop* p) { do_oop_nv(p); } 80 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 81 82 void set_ref_processor(ReferenceProcessor* rp) { 83 set_ref_processor_internal(rp); 84 } 85 }; 86 87 // Add back base class for metadata 88 class G1ParCopyHelper : public OopClosure { 89 protected: 90 G1CollectedHeap* _g1; 91 G1ParScanThreadState* _par_scan_state; 92 uint _worker_id; // Cache value from par_scan_state. 93 Klass* _scanned_klass; 94 G1ConcurrentMark* _cm; 95 96 // Mark the object if it's not already marked. This is used to mark 97 // objects pointed to by roots that are guaranteed not to move 98 // during the GC (i.e., non-CSet objects). It is MT-safe. 99 inline void mark_object(oop obj); 100 101 // Mark the object if it's not already marked. This is used to mark 102 // objects pointed to by roots that have been forwarded during a 103 // GC. It is MT-safe. 104 inline void mark_forwarded_object(oop from_obj, oop to_obj); 105 106 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 107 ~G1ParCopyHelper() { } 108 109 public: 110 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 111 template <class T> inline void do_klass_barrier(T* p, oop new_obj); 112 }; 113 114 enum G1Barrier { 115 G1BarrierNone, 116 G1BarrierKlass 117 }; 118 119 enum G1Mark { 120 G1MarkNone, 121 G1MarkFromRoot, 122 G1MarkPromotedFromRoot 123 }; 124 125 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext> 126 class G1ParCopyClosure : public G1ParCopyHelper { 127 public: 128 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 129 G1ParCopyHelper(g1, par_scan_state) { } 130 131 template <class T> void do_oop_work(T* p); 132 virtual void do_oop(oop* p) { do_oop_work(p); } 133 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 134 }; 135 136 class G1KlassScanClosure : public KlassClosure { 137 G1ParCopyHelper* _closure; 138 bool _process_only_dirty; 139 int _count; 140 public: 141 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) 142 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} 143 void do_klass(Klass* klass); 144 }; 145 146 // Closure for iterating over object fields during concurrent marking 147 class G1CMOopClosure : public MetadataAwareOopClosure { 148 protected: 149 G1ConcurrentMark* _cm; 150 private: 151 G1CollectedHeap* _g1h; 152 G1CMTask* _task; 153 public: 154 G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task); 155 template <class T> void do_oop_nv(T* p); 156 virtual void do_oop( oop* p) { do_oop_nv(p); } 157 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 158 }; 159 160 // Closure to scan the root regions during concurrent marking 161 class G1RootRegionScanClosure : public MetadataAwareOopClosure { 162 private: 163 G1CollectedHeap* _g1h; 164 G1ConcurrentMark* _cm; 165 public: 166 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) : 167 _g1h(g1h), _cm(cm) { } 168 template <class T> void do_oop_nv(T* p); 169 virtual void do_oop( oop* p) { do_oop_nv(p); } 170 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 171 }; 172 173 class G1ConcurrentRefineOopClosure: public ExtendedOopClosure { 174 G1CollectedHeap* _g1; 175 uint _worker_i; 176 177 public: 178 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) : 179 _g1(g1h), 180 _worker_i(worker_i) { 181 } 182 183 bool apply_to_weak_ref_discovered_field() { return true; } 184 185 template <class T> void do_oop_nv(T* p); 186 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 187 virtual void do_oop(oop* p) { do_oop_nv(p); } 188 }; 189 190 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure { 191 G1CollectedHeap* _g1; 192 HeapRegion* _from; 193 G1ParPushHeapRSClosure* _push_ref_cl; 194 bool _record_refs_into_cset; 195 uint _worker_i; 196 bool _has_refs_into_cset; 197 198 public: 199 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, 200 G1ParPushHeapRSClosure* push_ref_cl, 201 bool record_refs_into_cset, 202 uint worker_i); 203 204 void set_from(HeapRegion* from) { 205 assert(from != NULL, "from region must be non-NULL"); 206 _from = from; 207 } 208 209 bool apply_to_weak_ref_discovered_field() { return true; } 210 211 bool self_forwarded(oop obj) { 212 markOop m = obj->mark(); 213 bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj)); 214 return result; 215 } 216 217 bool has_refs_into_cset() const { return _has_refs_into_cset; } 218 219 template <class T> inline void do_oop_nv(T* p); 220 virtual inline void do_oop(narrowOop* p); 221 virtual inline void do_oop(oop* p); 222 }; 223 224 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP