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 public: 36 enum ArrayCopyStoreValMode { 37 NONE, 38 RESOLVE_BARRIER, 39 EVAC_BARRIER 40 }; 41 private: 42 43 ShenandoahHeap* _heap; 44 BufferNode::Allocator _satb_mark_queue_buffer_allocator; 45 ShenandoahSATBMarkQueueSet _satb_mark_queue_set; 46 47 public: 48 ShenandoahBarrierSet(ShenandoahHeap* heap); 49 50 static ShenandoahBarrierSetAssembler* assembler(); 51 52 inline static ShenandoahBarrierSet* barrier_set() { 53 return barrier_set_cast<ShenandoahBarrierSet>(BarrierSet::barrier_set()); 54 } 55 56 static ShenandoahSATBMarkQueueSet& satb_mark_queue_set() { 57 return barrier_set()->_satb_mark_queue_set; 58 } 59 60 void print_on(outputStream* st) const; 61 62 bool is_a(BarrierSet::Name bsn); 63 64 bool is_aligned(HeapWord* hw); 65 66 void write_ref_array(HeapWord* start, size_t count); 67 68 template <class T> void 69 write_ref_array_pre_work(T* dst, size_t count); 70 71 void write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized); 72 73 void write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized); 74 75 // We export this to make it available in cases where the static 76 // type of the barrier set is known. Note that it is non-virtual. 77 template <class T> inline void inline_write_ref_field_pre(T* field, oop new_val); 78 79 // These are the more general virtual versions. 80 void write_ref_field_pre_work(oop* field, oop new_val); 81 void write_ref_field_pre_work(narrowOop* field, oop new_val); 82 void write_ref_field_pre_work(void* field, oop new_val); 83 84 void write_ref_field_work(void* v, oop o, bool release = false); 85 void write_region(MemRegion mr); 86 87 oop oop_load_from_native_barrier(oop obj); 88 89 virtual void on_thread_create(Thread* thread); 90 virtual void on_thread_destroy(Thread* thread); 91 virtual void on_thread_attach(Thread* thread); 92 virtual void on_thread_detach(Thread* thread); 93 94 static inline oop resolve_forwarded_not_null(oop p); 95 static inline oop resolve_forwarded(oop p); 96 97 void storeval_barrier(oop obj); 98 void keep_alive_barrier(oop obj); 99 100 oop load_reference_barrier(oop obj); 101 oop load_reference_barrier_mutator(oop obj); 102 oop load_reference_barrier_not_null(oop obj); 103 104 void enqueue(oop obj); 105 106 private: 107 template <class T, bool STOREVAL_WRITE_BARRIER> 108 void write_ref_array_loop(HeapWord* start, size_t count); 109 110 oop load_reference_barrier_impl(oop obj); 111 112 static void keep_alive_if_weak(DecoratorSet decorators, oop value) { 113 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known"); 114 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0; 115 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0; 116 if (!peek && !on_strong_oop_ref && value != NULL) { 117 ShenandoahBarrierSet::barrier_set()->keep_alive_barrier(value); 118 } 119 } 120 121 template <typename T> 122 bool arraycopy_loop_1(T* src, T* dst, size_t length, Klass* bound, 123 bool checkcast, bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode); 124 125 template <typename T, bool CHECKCAST> 126 bool arraycopy_loop_2(T* src, T* dst, size_t length, Klass* bound, 127 bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode); 128 129 template <typename T, bool CHECKCAST, bool SATB> 130 bool arraycopy_loop_3(T* src, T* dst, size_t length, Klass* bound, 131 bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode); 132 133 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE> 134 bool arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint); 135 136 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE> 137 bool arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* const thread, ShenandoahMarkingContext* const ctx); 138 139 public: 140 // Callbacks for runtime accesses. 141 template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet> 142 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> { 143 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw; 144 145 template <typename T> 146 static oop oop_atomic_cmpxchg_in_heap_impl(oop new_value, T* addr, oop compare_value); 147 148 template <typename T> 149 static oop oop_atomic_xchg_in_heap_impl(oop new_value, T* addr); 150 151 public: 152 // Heap oop accesses. These accessors get resolved when 153 // IN_HEAP is set (e.g. when using the HeapAccess API), it is 154 // an oop_* overload, and the barrier strength is AS_NORMAL. 155 template <typename T> 156 static oop oop_load_in_heap(T* addr); 157 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset); 158 159 template <typename T> 160 static void oop_store_in_heap(T* addr, oop value); 161 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value); 162 163 template <typename T> 164 static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value); 165 static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value); 166 167 template <typename T> 168 static oop oop_atomic_xchg_in_heap(oop new_value, T* addr); 169 static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset); 170 171 template <typename T> 172 static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw, 173 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw, 174 size_t length); 175 176 // Clone barrier support 177 static void clone_in_heap(oop src, oop dst, size_t size); 178 179 // Needed for loads on non-heap weak references 180 template <typename T> 181 static oop oop_load_not_in_heap(T* addr); 182 183 // Used for catching bad stores 184 template <typename T> 185 static void oop_store_not_in_heap(T* addr, oop value); 186 187 template <typename T> 188 static oop oop_atomic_cmpxchg_not_in_heap(oop new_value, T* addr, oop compare_value); 189 190 template <typename T> 191 static oop oop_atomic_xchg_not_in_heap(oop new_value, T* addr); 192 193 }; 194 195 }; 196 197 template<> 198 struct BarrierSet::GetName<ShenandoahBarrierSet> { 199 static const BarrierSet::Name value = BarrierSet::ShenandoahBarrierSet; 200 }; 201 202 template<> 203 struct BarrierSet::GetType<BarrierSet::ShenandoahBarrierSet> { 204 typedef ::ShenandoahBarrierSet type; 205 }; 206 207 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP