1 /* 2 * Copyright (c) 2000, 2015, 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 virtual void write_ref_array_region(MemRegion mr) = 0; 40 41 // These methods serve the only purpose of speeding up build times by reducing 42 // included files 43 static Klass* bound_for_array(oop obj); 44 static bool is_bounded_by(oop obj, Klass* klass); 45 46 public: 47 // Causes all refs in "mr" to be assumed to be modified. 48 virtual void invalidate(MemRegion mr) = 0; 49 50 // Operations on arrays, or general regions (e.g., for "clone") may be 51 // optimized by some barriers. 52 53 // Below length is the # array elements being written 54 virtual void write_ref_array_pre(oop* dst, int length, 55 bool dest_uninitialized = false) {} 56 virtual void write_ref_array_pre(narrowOop* dst, int length, 57 bool dest_uninitialized = false) {} 58 // Below count is the # array elements being written, starting 59 // at the address "start", which may not necessarily be HeapWord-aligned 60 inline void write_ref_array(HeapWord* start, size_t count); 61 62 // Static versions, suitable for calling from generated code; 63 // count is # array elements being written, starting with "start", 64 // which may not necessarily be HeapWord-aligned. 65 static void static_write_ref_array_pre(HeapWord* start, size_t count); 66 static void static_write_ref_array_post(HeapWord* start, size_t count); 67 68 template <DecoratorSet decorators> 69 inline void write_ref_field_pre(void* addr) {} 70 71 template <DecoratorSet decorators> 72 inline void write_ref_field_post(void *addr, oop new_value) {} 73 74 // barriers used by klass_oop_store 75 void klass_update_barrier_set_pre(Klass* klass, oop* p) {} 76 void klass_update_barrier_set(Klass* klass, oop* p, oop v); 77 78 template <DecoratorSet decorators, typename BarrierSetT> 79 class AccessBarrier: public BarrierSet::AccessBarrier<decorators> { 80 typedef BarrierSet::AccessBarrier<decorators> Basic; 81 82 public: 83 typedef Basic SuperAccessBarrier; 84 85 static void oop_store(void* addr, oop value); 86 87 static oop oop_cas(oop new_value, void* addr, oop compare_value); 88 89 static oop oop_swap(oop new_value, void* addr); 90 91 template <typename T> 92 static bool oop_copy(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length); 93 94 static void clone(oop src, oop dst, size_t size); 95 96 static inline void oop_store_at(oop base, ptrdiff_t offset, oop value) { 97 oop_store(Basic::field_addr(base, offset), value); 98 } 99 100 static inline void oop_store_at(Klass* base, ptrdiff_t offset, oop value); 101 102 static inline oop oop_swap_at(oop new_value, oop base, ptrdiff_t offset) { 103 return oop_swap(new_value, Basic::field_addr(base, offset)); 104 } 105 106 static inline oop oop_cas_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) { 107 return oop_cas(new_value, Basic::field_addr(base, offset), compare_value); 108 } 109 }; 110 }; 111 112 template<> 113 struct BSTypeToName<ModRefBarrierSet> { 114 static const BarrierSet::Name value = BarrierSet::ModRef; 115 }; 116 117 template<> 118 struct BSNameToType<BarrierSet::ModRef> { 119 typedef ModRefBarrierSet type; 120 }; 121 122 #endif // SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP