1 /* 2 * Copyright (c) 2001, 2007, 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 SERIALGC 26 27 class DirtyCardQueueSet; 28 29 // This barrier is specialized to use a logging barrier to support 30 // snapshot-at-the-beginning marking. 31 32 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { 33 private: 34 // Add "pre_val" to a set of objects that may have been disconnected from the 35 // pre-marking object graph. 36 static void enqueue(oop pre_val); 37 38 public: 39 G1SATBCardTableModRefBS(MemRegion whole_heap, 40 int max_covered_regions); 41 42 bool is_a(BarrierSet::Name bsn) { 43 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); 44 } 45 46 virtual bool has_write_ref_pre_barrier() { return true; } 47 48 // This notes that we don't need to access any BarrierSet data 49 // structures, so this can be called from a static context. 50 template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { 51 T heap_oop = oopDesc::load_heap_oop(field); 52 if (!oopDesc::is_null(heap_oop)) { 53 enqueue(oopDesc::decode_heap_oop(heap_oop)); 54 } 55 } 56 57 // When we know the current java thread: 58 template <class T> static void write_ref_field_pre_static(T* field, oop newVal, 59 JavaThread* jt); 60 61 // We export this to make it available in cases where the static 62 // type of the barrier set is known. Note that it is non-virtual. 63 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { 64 write_ref_field_pre_static(field, newVal); 65 } 66 67 // These are the more general virtual versions. 68 virtual void write_ref_field_pre_work(oop* field, oop new_val) { 69 inline_write_ref_field_pre(field, new_val); 70 } 71 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { 72 inline_write_ref_field_pre(field, new_val); 73 } 74 virtual void write_ref_field_pre_work(void* field, oop new_val) { 75 guarantee(false, "Not needed"); 76 } 77 78 template <class T> void write_ref_array_pre_work(T* dst, int count); 79 virtual void write_ref_array_pre(oop* dst, int count) { 80 write_ref_array_pre_work(dst, count); 81 } 82 virtual void write_ref_array_pre(narrowOop* dst, int count) { 83 write_ref_array_pre_work(dst, count); 84 } 85 }; 86 87 // Adds card-table logging to the post-barrier. 88 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. 89 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { 90 private: 91 DirtyCardQueueSet& _dcqs; 92 public: 93 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, 94 int max_covered_regions); 95 96 bool is_a(BarrierSet::Name bsn) { 97 return bsn == BarrierSet::G1SATBCTLogging || 98 G1SATBCardTableModRefBS::is_a(bsn); 99 } 100 101 void write_ref_field_work(void* field, oop new_val); 102 103 // Can be called from static contexts. 104 static void write_ref_field_static(void* field, oop new_val); 105 106 // NB: if you do a whole-heap invalidation, the "usual invariant" defined 107 // above no longer applies. 108 void invalidate(MemRegion mr, bool whole_heap = false); 109 110 void write_region_work(MemRegion mr) { invalidate(mr); } 111 void write_ref_array_work(MemRegion mr) { invalidate(mr); } 112 113 114 }; 115 116 117 #endif // SERIALGC