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 static bool need_load_reference_barrier(DecoratorSet decorators, BasicType type);
61 static bool use_load_reference_barrier_native(DecoratorSet decorators, BasicType type);
62 static bool need_keep_alive_barrier(DecoratorSet decorators, BasicType type);
63
64 void print_on(outputStream* st) const;
65
66 bool is_a(BarrierSet::Name bsn);
67
68 bool is_aligned(HeapWord* hw);
69
70 template <class T> void
71 write_ref_array_pre_work(T* src, T* dst, size_t count, bool dest_uninitialized);
72
73 inline void arraycopy_pre(oop* src, oop* dst, size_t count);
74 inline void arraycopy_pre(narrowOop* src, narrowOop* dst, size_t count);
75 inline void arraycopy_update(oop* src, size_t count);
76 inline void arraycopy_update(narrowOop* src, size_t count);
77 inline void clone_barrier(oop src);
78 void clone_barrier_runtime(oop src);
79
80 virtual void on_thread_create(Thread* thread);
81 virtual void on_thread_destroy(Thread* thread);
82 virtual void on_thread_attach(Thread* thread);
83 virtual void on_thread_detach(Thread* thread);
84
85 static inline oop resolve_forwarded_not_null(oop p);
86 static inline oop resolve_forwarded(oop p);
87 static inline oop resolve_forwarded_checked(oop p);
88
89 template <DecoratorSet decorators, typename T>
90 inline void satb_barrier(T* field);
91 inline void satb_enqueue(oop value);
92 inline void storeval_barrier(oop obj);
93
94 template <DecoratorSet decorators>
95 inline void keep_alive_if_weak(oop value);
96 inline void keep_alive_if_weak(DecoratorSet decorators, oop value);
97 inline void keep_alive_barrier(oop value);
98
99 inline void enqueue(oop obj);
100
101 oop load_reference_barrier(oop obj);
102 oop load_reference_barrier_not_null(oop obj);
103
104 oop load_reference_barrier_mutator(oop obj, oop* load_addr);
105 oop load_reference_barrier_mutator(oop obj, narrowOop* load_addr);
106
107 template <class T>
108 oop load_reference_barrier_mutator_work(oop obj, T* load_addr);
109
110 oop load_reference_barrier_native(oop obj, oop* load_addr);
111 oop load_reference_barrier_native(oop obj, narrowOop* load_addr);
112
113 private:
114 template <class T>
115 inline void arraycopy_pre_work(T* src, T* dst, size_t count);
116 template <class T, bool HAS_FWD, bool EVAC, bool ENQUEUE>
117 inline void arraycopy_work(T* src, size_t count);
118 template <class T>
119 inline void arraycopy_update_impl(T* src, size_t count);
120
121 oop load_reference_barrier_impl(oop obj);
122
123 template <class T>
124 oop load_reference_barrier_native_impl(oop obj, T* load_addr);
125
126 public:
127 // Callbacks for runtime accesses.
128 template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet>
129 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
130 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
131
132 public:
133 // Heap oop accesses. These accessors get resolved when
134 // IN_HEAP is set (e.g. when using the HeapAccess API), it is
135 // an oop_* overload, and the barrier strength is AS_NORMAL.
136 template <typename T>
137 static oop oop_load_in_heap(T* addr);
138 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);
139
140 template <typename T>
141 static void oop_store_in_heap(T* addr, oop value);
142 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value);
143
144 template <typename T>
145 static oop oop_atomic_cmpxchg_in_heap(T* addr, oop compare_value, oop new_value);
146 static oop oop_atomic_cmpxchg_in_heap_at(oop base, ptrdiff_t offset, oop compare_value, oop new_value);
147
148 template <typename T>
149 static oop oop_atomic_xchg_in_heap(T* addr, oop new_value);
150 static oop oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value);
151
152 template <typename T>
153 static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
154 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
155 size_t length);
156
157 // Clone barrier support
158 static void clone_in_heap(oop src, oop dst, size_t size);
159
160 // Needed for loads on non-heap weak references
161 template <typename T>
162 static oop oop_load_not_in_heap(T* addr);
163
164 // Used for catching bad stores
165 template <typename T>
166 static void oop_store_not_in_heap(T* addr, oop value);
167
168 template <typename T>
169 static oop oop_atomic_cmpxchg_not_in_heap(T* addr, oop compare_value, oop new_value);
170
171 template <typename T>
172 static oop oop_atomic_xchg_not_in_heap(T* addr, oop new_value);
173
174 };
175
176 };
177
178 template<>
179 struct BarrierSet::GetName<ShenandoahBarrierSet> {
180 static const BarrierSet::Name value = BarrierSet::ShenandoahBarrierSet;
181 };
182
183 template<>
184 struct BarrierSet::GetType<BarrierSet::ShenandoahBarrierSet> {
185 typedef ::ShenandoahBarrierSet type;
186 };
187
188 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP