1 /*
2 * Copyright (c) 2013, 2021, Red Hat, Inc. 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_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP
27
28 #include "gc/shared/barrierSet.hpp"
29 #include "gc/shared/bufferNode.hpp"
30 #include "gc/shenandoah/shenandoahSATBMarkQueueSet.hpp"
31
32 class ShenandoahHeap;
33 class ShenandoahBarrierSetAssembler;
34
35 class ShenandoahBarrierSet: public BarrierSet {
36 private:
37 ShenandoahHeap* const _heap;
38 BufferNode::Allocator _satb_mark_queue_buffer_allocator;
39 ShenandoahSATBMarkQueueSet _satb_mark_queue_set;
40
41 public:
42 ShenandoahBarrierSet(ShenandoahHeap* heap);
43
44 static ShenandoahBarrierSetAssembler* assembler();
45
46 inline static ShenandoahBarrierSet* barrier_set() {
47 return barrier_set_cast<ShenandoahBarrierSet>(BarrierSet::barrier_set());
48 }
49
50 static ShenandoahSATBMarkQueueSet& satb_mark_queue_set() {
51 return barrier_set()->_satb_mark_queue_set;
52 }
53
54 static bool need_load_reference_barrier(DecoratorSet decorators, BasicType type);
55 static bool need_keep_alive_barrier(DecoratorSet decorators, BasicType type);
56
57 static bool is_strong_access(DecoratorSet decorators) {
58 return (decorators & (ON_WEAK_OOP_REF | ON_PHANTOM_OOP_REF)) == 0;
59 }
60
61 static bool is_weak_access(DecoratorSet decorators) {
62 return (decorators & ON_WEAK_OOP_REF) != 0;
63 }
64
65 static bool is_phantom_access(DecoratorSet decorators) {
66 return (decorators & ON_PHANTOM_OOP_REF) != 0;
67 }
68
69 static bool is_native_access(DecoratorSet decorators) {
70 return (decorators & IN_NATIVE) != 0;
71 }
72
73 void print_on(outputStream* st) const;
74
75 template <class T>
76 inline void arraycopy_barrier(T* src, T* dst, 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_not_null_mutator(oop p);
87 static inline oop resolve_forwarded(oop p);
88
89 template <DecoratorSet decorators, typename T>
90 inline void satb_barrier(T* field);
91 inline void satb_enqueue(oop value);
92
93 inline void keep_alive_if_weak(DecoratorSet decorators, oop value);
94
95 inline void enqueue(oop obj);
96
97 inline oop load_reference_barrier(oop obj);
98
99 template <class T>
100 inline oop load_reference_barrier_mutator(oop obj, T* load_addr);
101
102 template <class T>
103 inline oop load_reference_barrier(DecoratorSet decorators, oop obj, T* load_addr);
104
105 template <typename T>
106 inline oop oop_load(DecoratorSet decorators, T* addr);
107
108 template <typename T>
109 inline oop oop_cmpxchg(DecoratorSet decorators, T* addr, oop compare_value, oop new_value);
110
111 template <typename T>
112 inline oop oop_xchg(DecoratorSet decorators, T* addr, oop new_value);
113
114 private:
115 template <class T>
116 inline void arraycopy_marking(T* src, T* dst, size_t count);
117 template <class T>
118 inline void arraycopy_evacuation(T* src, size_t count);
119 template <class T>
120 inline void arraycopy_update(T* src, size_t count);
121
122 inline void clone_evacuation(oop src);
123 inline void clone_update(oop src);
124
125 template <class T, bool HAS_FWD, bool EVAC, bool ENQUEUE>
126 inline void arraycopy_work(T* src, size_t count);
127
128 inline bool need_bulk_update(HeapWord* dst);
129 public:
130 // Callbacks for runtime accesses.
131 template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet>
132 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
133 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
134
135 private:
136 template <typename T>
137 static void oop_store_common(T* addr, oop value);
138
139 public:
140 // Heap oop accesses. These accessors get resolved when
141 // IN_HEAP is set (e.g. when using the HeapAccess API), it is
142 // an oop_* overload, and the barrier strength is AS_NORMAL.
143 template <typename T>
144 static oop oop_load_in_heap(T* addr);
145 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);
146
147 template <typename T>
148 static void oop_store_in_heap(T* addr, oop value);
149 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value);
150
151 template <typename T>
152 static oop oop_atomic_cmpxchg_in_heap(T* addr, oop compare_value, oop new_value);
153 static oop oop_atomic_cmpxchg_in_heap_at(oop base, ptrdiff_t offset, oop compare_value, oop new_value);
154
155 template <typename T>
156 static oop oop_atomic_xchg_in_heap(T* addr, oop new_value);
157 static oop oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value);
158
159 template <typename T>
160 static void oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
161 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
162 size_t length);
163
164 // Clone barrier support
165 static void clone_in_heap(oop src, oop dst, size_t size);
166
167 // Support for concurrent roots evacuation, updating and weak roots clearing
168 template <typename T>
169 static oop oop_load_not_in_heap(T* addr);
170
171 // Support for concurrent roots marking
172 template <typename T>
173 static void oop_store_not_in_heap(T* addr, oop value);
174
175 template <typename T>
176 static oop oop_atomic_cmpxchg_not_in_heap(T* addr, oop compare_value, oop new_value);
177
178 template <typename T>
179 static oop oop_atomic_xchg_not_in_heap(T* addr, oop new_value);
180 };
181
182 };
183
184 template<>
185 struct BarrierSet::GetName<ShenandoahBarrierSet> {
186 static const BarrierSet::Name value = BarrierSet::ShenandoahBarrierSet;
187 };
188
189 template<>
190 struct BarrierSet::GetType<BarrierSet::ShenandoahBarrierSet> {
191 typedef ::ShenandoahBarrierSet type;
192 };
193
194 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP