1 /* 2 * Copyright (c) 2001, 2018, 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_G1BARRIERSET_HPP 26 #define SHARE_VM_GC_G1_G1BARRIERSET_HPP 27 28 #include "gc/g1/dirtyCardQueue.hpp" 29 #include "gc/g1/g1SATBMarkQueueSet.hpp" 30 #include "gc/shared/cardTableBarrierSet.hpp" 31 32 class DirtyCardQueueSet; 33 class CardTable; 34 class G1CardTable; 35 36 // This barrier is specialized to use a logging barrier to support 37 // snapshot-at-the-beginning marking. 38 39 class G1BarrierSet: public CardTableBarrierSet { 40 friend class VMStructs; 41 private: 42 BufferNode::Allocator _satb_mark_queue_buffer_allocator; 43 BufferNode::Allocator _dirty_card_queue_buffer_allocator; 44 G1SATBMarkQueueSet _satb_mark_queue_set; 45 DirtyCardQueueSet _dirty_card_queue_set; 46 g1_barrier_set()47 static G1BarrierSet* g1_barrier_set() { 48 return barrier_set_cast<G1BarrierSet>(BarrierSet::barrier_set()); 49 } 50 51 public: 52 G1BarrierSet(G1CardTable* table); ~G1BarrierSet()53 ~G1BarrierSet() { } 54 55 // Add "pre_val" to a set of objects that may have been disconnected from the 56 // pre-marking object graph. 57 static void enqueue(oop pre_val); 58 59 static void enqueue_if_weak(DecoratorSet decorators, oop value); 60 61 template <class T> void write_ref_array_pre_work(T* dst, size_t count); 62 virtual void write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized); 63 virtual void write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized); 64 65 template <DecoratorSet decorators, typename T> 66 void write_ref_field_pre(T* field); 67 68 // NB: if you do a whole-heap invalidation, the "usual invariant" defined 69 // above no longer applies. 70 void invalidate(MemRegion mr); 71 write_region(MemRegion mr)72 void write_region(MemRegion mr) { invalidate(mr); } write_ref_array_work(MemRegion mr)73 void write_ref_array_work(MemRegion mr) { invalidate(mr); } 74 75 template <DecoratorSet decorators, typename T> 76 void write_ref_field_post(T* field, oop new_val); 77 void write_ref_field_post_slow(volatile jbyte* byte); 78 79 virtual void on_thread_create(Thread* thread); 80 virtual void on_thread_destroy(Thread* thread); 81 virtual void on_thread_attach(JavaThread* thread); 82 virtual void on_thread_detach(JavaThread* thread); 83 84 BufferNode::Allocator& satb_mark_queue_buffer_allocator(); 85 BufferNode::Allocator& dirty_card_queue_buffer_allocator(); 86 satb_mark_queue_set()87 static G1SATBMarkQueueSet& satb_mark_queue_set() { 88 return g1_barrier_set()->_satb_mark_queue_set; 89 } 90 dirty_card_queue_set()91 static DirtyCardQueueSet& dirty_card_queue_set() { 92 return g1_barrier_set()->_dirty_card_queue_set; 93 } 94 95 // Callbacks for runtime accesses. 96 template <DecoratorSet decorators, typename BarrierSetT = G1BarrierSet> 97 class AccessBarrier: public ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> { 98 typedef ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> ModRef; 99 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw; 100 101 public: 102 // Needed for loads on non-heap weak references 103 template <typename T> 104 static oop oop_load_not_in_heap(T* addr); 105 106 // Needed for non-heap stores 107 template <typename T> 108 static void oop_store_not_in_heap(T* addr, oop new_value); 109 110 // Needed for weak references 111 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset); 112 113 // Defensive: will catch weak oops at addresses in heap 114 template <typename T> 115 static oop oop_load_in_heap(T* addr); 116 }; 117 }; 118 119 template<> 120 struct BarrierSet::GetName<G1BarrierSet> { 121 static const BarrierSet::Name value = BarrierSet::G1BarrierSet; 122 }; 123 124 template<> 125 struct BarrierSet::GetType<BarrierSet::G1BarrierSet> { 126 typedef ::G1BarrierSet type; 127 }; 128 129 #endif // SHARE_VM_GC_G1_G1BARRIERSET_HPP 130