1 /* 2 * Copyright (c) 2013, 2019, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP 25 #define SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP 26 27 #include "gc/shared/accessBarrierSupport.hpp" 28 #include "gc/shared/barrierSet.hpp" 29 #include "gc/shenandoah/shenandoahHeap.hpp" 30 #include "gc/shenandoah/shenandoahSATBMarkQueueSet.hpp" 31 32 class ShenandoahBarrierSetAssembler; 33 34 class ShenandoahBarrierSet: public BarrierSet { 35 private: 36 enum ArrayCopyStoreValMode { 37 NONE, 38 READ_BARRIER, 39 WRITE_BARRIER 40 }; 41 42 ShenandoahHeap* _heap; 43 ShenandoahSATBMarkQueueSet _satb_mark_queue_set; 44 45 public: 46 ShenandoahBarrierSet(ShenandoahHeap* heap); 47 48 static ShenandoahBarrierSetAssembler* assembler(); 49 50 inline static ShenandoahBarrierSet* barrier_set() { 51 return barrier_set_cast<ShenandoahBarrierSet>(BarrierSet::barrier_set()); 52 } 53 54 static ShenandoahSATBMarkQueueSet& satb_mark_queue_set() { 55 return barrier_set()->_satb_mark_queue_set; 56 } 57 58 void print_on(outputStream* st) const; 59 60 bool is_a(BarrierSet::Name bsn); 61 62 bool is_aligned(HeapWord* hw); 63 64 void write_ref_array(HeapWord* start, size_t count); 65 66 template <class T> void 67 write_ref_array_pre_work(T* dst, size_t count); 68 69 void write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized); 70 71 void write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized); 72 73 // We export this to make it available in cases where the static 74 // type of the barrier set is known. Note that it is non-virtual. 75 template <class T> inline void inline_write_ref_field_pre(T* field, oop new_val); 76 77 // These are the more general virtual versions. 78 void write_ref_field_pre_work(oop* field, oop new_val); 79 void write_ref_field_pre_work(narrowOop* field, oop new_val); 80 void write_ref_field_pre_work(void* field, oop new_val); 81 82 void write_ref_field_work(void* v, oop o, bool release = false); 83 void write_region(MemRegion mr); 84 85 virtual void on_thread_create(Thread* thread); 86 virtual void on_thread_destroy(Thread* thread); 87 virtual void on_thread_attach(Thread* thread); 88 virtual void on_thread_detach(Thread* thread); 89 90 static inline oop resolve_forwarded_not_null(oop p); 91 static inline oop resolve_forwarded(oop p); 92 93 void storeval_barrier(oop obj); 94 void keep_alive_barrier(oop obj); 95 96 oop load_reference_barrier(oop obj); 97 oop load_reference_barrier_mutator(oop obj); 98 oop load_reference_barrier_not_null(oop obj); 99 100 void enqueue(oop obj); 101 102 private: 103 template <class T, bool STOREVAL_WRITE_BARRIER> 104 void write_ref_array_loop(HeapWord* start, size_t count); 105 106 oop load_reference_barrier_impl(oop obj); 107 108 static void keep_alive_if_weak(DecoratorSet decorators, oop value) { 109 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known"); 110 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0; 111 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0; 112 if (!peek && !on_strong_oop_ref && value != NULL) { 113 ShenandoahBarrierSet::barrier_set()->keep_alive_barrier(value); 114 } 115 } 116 117 template <typename T> 118 bool arraycopy_loop_1(T* src, T* dst, size_t length, Klass* bound, 119 bool checkcast, bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode); 120 121 template <typename T, bool CHECKCAST> 122 bool arraycopy_loop_2(T* src, T* dst, size_t length, Klass* bound, 123 bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode); 124 125 template <typename T, bool CHECKCAST, bool SATB> 126 bool arraycopy_loop_3(T* src, T* dst, size_t length, Klass* bound, 127 bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode); 128 129 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE> 130 bool arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint); 131 132 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE> 133 bool arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* const thread, ShenandoahMarkingContext* const ctx); 134 135 public: 136 // Callbacks for runtime accesses. 137 template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet> 138 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> { 139 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw; 140 141 template <typename T> 142 static oop oop_atomic_cmpxchg_in_heap_impl(oop new_value, T* addr, oop compare_value); 143 144 template <typename T> 145 static oop oop_atomic_xchg_in_heap_impl(oop new_value, T* addr); 146 147 public: 148 // Heap oop accesses. These accessors get resolved when 149 // IN_HEAP is set (e.g. when using the HeapAccess API), it is 150 // an oop_* overload, and the barrier strength is AS_NORMAL. 151 template <typename T> 152 static oop oop_load_in_heap(T* addr); 153 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset); 154 155 template <typename T> 156 static void oop_store_in_heap(T* addr, oop value); 157 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value); 158 159 template <typename T> 160 static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value); 161 static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value); 162 163 template <typename T> 164 static oop oop_atomic_xchg_in_heap(oop new_value, T* addr); 165 static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset); 166 167 template <typename T> 168 static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw, 169 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw, 170 size_t length); 171 172 // Clone barrier support 173 static void clone_in_heap(oop src, oop dst, size_t size); 174 175 // Needed for loads on non-heap weak references 176 template <typename T> 177 static oop oop_load_not_in_heap(T* addr); 178 179 template <typename T> 180 static oop oop_atomic_cmpxchg_not_in_heap(oop new_value, T* addr, oop compare_value); 181 182 template <typename T> 183 static oop oop_atomic_xchg_not_in_heap(oop new_value, T* addr); 184 185 }; 186 187 }; 188 189 template<> 190 struct BarrierSet::GetName<ShenandoahBarrierSet> { 191 static const BarrierSet::Name value = BarrierSet::ShenandoahBarrierSet; 192 }; 193 194 template<> 195 struct BarrierSet::GetType<BarrierSet::ShenandoahBarrierSet> { 196 typedef ::ShenandoahBarrierSet type; 197 }; 198 199 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP