1 /* 2 * Copyright (c) 2000, 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_SHARED_MODREFBARRIERSET_HPP 26 #define SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP 27 28 #include "gc/shared/barrierSet.hpp" 29 #include "memory/memRegion.hpp" 30 31 class Klass; 32 33 class ModRefBarrierSet: public BarrierSet { 34 protected: 35 ModRefBarrierSet(const BarrierSet::FakeRtti& fake_rtti) 36 : BarrierSet(fake_rtti.add_tag(BarrierSet::ModRef)) { } 37 ~ModRefBarrierSet() { } 38 39 public: 40 template <DecoratorSet decorators, typename T> 41 inline void write_ref_field_pre(T* addr) {} 42 43 template <DecoratorSet decorators, typename T> 44 inline void write_ref_field_post(T *addr, oop new_value) {} 45 46 // Causes all refs in "mr" to be assumed to be modified. 47 virtual void invalidate(MemRegion mr) = 0; 48 virtual void write_region(MemRegion mr) = 0; 49 50 // The ModRef abstraction introduces pre and post barriers 51 template <DecoratorSet decorators, typename BarrierSetT> 52 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> { 53 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw; 54 55 public: 56 template <typename T> 57 static void oop_store_in_heap(T* addr, oop value); 58 template <typename T> 59 static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value); 60 template <typename T> 61 static oop oop_atomic_xchg_in_heap(oop new_value, T* addr); 62 63 template <typename T> 64 static bool oop_arraycopy_in_heap(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length); 65 66 static void clone_in_heap(oop src, oop dst, size_t size); 67 68 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) { 69 oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value); 70 } 71 72 static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset) { 73 return oop_atomic_xchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset)); 74 } 75 76 static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) { 77 return oop_atomic_cmpxchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset), compare_value); 78 } 79 }; 80 }; 81 82 template<> 83 struct BarrierSet::GetName<ModRefBarrierSet> { 84 static const BarrierSet::Name value = BarrierSet::ModRef; 85 }; 86 87 #endif // SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP