1 /*
2 * Copyright (c) 2013, 2019, 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/accessBarrierSupport.hpp"
29 #include "gc/shared/barrierSet.hpp"
30 #include "gc/shenandoah/shenandoahHeap.hpp"
31 #include "gc/shenandoah/shenandoahSATBMarkQueueSet.hpp"
32
33 class ShenandoahBarrierSetAssembler;
34
35 class ShenandoahBarrierSet: public BarrierSet {
36 public:
37 enum ArrayCopyStoreValMode {
38 NONE,
39 RESOLVE_BARRIER,
40 EVAC_BARRIER
41 };
42 private:
43
44 ShenandoahHeap* _heap;
45 BufferNode::Allocator _satb_mark_queue_buffer_allocator;
46 ShenandoahSATBMarkQueueSet _satb_mark_queue_set;
47
48 public:
49 ShenandoahBarrierSet(ShenandoahHeap* heap);
50
51 static ShenandoahBarrierSetAssembler* assembler();
52
53 inline static ShenandoahBarrierSet* barrier_set() {
54 return barrier_set_cast<ShenandoahBarrierSet>(BarrierSet::barrier_set());
55 }
56
57 static ShenandoahSATBMarkQueueSet& satb_mark_queue_set() {
58 return barrier_set()->_satb_mark_queue_set;
59 }
60
61 static bool need_load_reference_barrier(DecoratorSet decorators, BasicType type);
62 static bool use_load_reference_barrier_native(DecoratorSet decorators, BasicType type);
63 static bool need_keep_alive_barrier(DecoratorSet decorators, BasicType type);
64
65 void print_on(outputStream* st) const;
66
67 bool is_a(BarrierSet::Name bsn);
68
69 bool is_aligned(HeapWord* hw);
70
71 template <class T> void
72 write_ref_array_pre_work(T* src, T* dst, size_t count, bool dest_uninitialized);
73
74 inline void arraycopy_pre(oop* src, oop* dst, size_t count);
75 inline void arraycopy_pre(narrowOop* src, narrowOop* dst, size_t count);
76 inline void arraycopy_update(oop* src, size_t count);
77 inline void arraycopy_update(narrowOop* src, size_t count);
78 inline void clone_barrier(oop src);
79 void clone_barrier_runtime(oop src);
80
81 virtual void on_thread_create(Thread* thread);
82 virtual void on_thread_destroy(Thread* thread);
83 virtual void on_thread_attach(Thread* thread);
84 virtual void on_thread_detach(Thread* thread);
85
86 static inline oop resolve_forwarded_not_null(oop p);
87 static inline oop resolve_forwarded_not_null_mutator(oop p);
88 static inline oop resolve_forwarded(oop p);
89
90 template <DecoratorSet decorators, typename T>
91 inline void satb_barrier(T* field);
92 inline void satb_enqueue(oop value);
93 inline void storeval_barrier(oop obj);
94
95 template <DecoratorSet decorators>
96 inline void keep_alive_if_weak(oop value);
97 inline void keep_alive_if_weak(DecoratorSet decorators, 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 inline bool skip_bulk_update(HeapWord* dst);
127 public:
128 // Callbacks for runtime accesses.
129 template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet>
130 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
131 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
132
133 public:
134 // Heap oop accesses. These accessors get resolved when
135 // IN_HEAP is set (e.g. when using the HeapAccess API), it is
136 // an oop_* overload, and the barrier strength is AS_NORMAL.
137 template <typename T>
138 static oop oop_load_in_heap(T* addr);
139 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);
140
141 template <typename T>
142 static void oop_store_in_heap(T* addr, oop value);
143 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value);
144
145 template <typename T>
146 static oop oop_atomic_cmpxchg_in_heap(T* addr, oop compare_value, oop new_value);
147 static oop oop_atomic_cmpxchg_in_heap_at(oop base, ptrdiff_t offset, oop compare_value, oop new_value);
148
149 template <typename T>
150 static oop oop_atomic_xchg_in_heap(T* addr, oop new_value);
151 static oop oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value);
152
153 template <typename T>
154 static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
155 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
156 size_t length);
157
158 // Clone barrier support
159 static void clone_in_heap(oop src, oop dst, size_t size);
160
161 // Needed for loads on non-heap weak references
162 template <typename T>
163 static oop oop_load_not_in_heap(T* addr);
164
165 // Used for catching bad stores
166 template <typename T>
167 static void oop_store_not_in_heap(T* addr, oop value);
168
169 template <typename T>
170 static oop oop_atomic_cmpxchg_not_in_heap(T* addr, oop compare_value, oop new_value);
171
172 template <typename T>
173 static oop oop_atomic_xchg_not_in_heap(T* addr, oop new_value);
174
175 };
176
177 };
178
179 template<>
180 struct BarrierSet::GetName<ShenandoahBarrierSet> {
181 static const BarrierSet::Name value = BarrierSet::ShenandoahBarrierSet;
182 };
183
184 template<>
185 struct BarrierSet::GetType<BarrierSet::ShenandoahBarrierSet> {
186 typedef ::ShenandoahBarrierSet type;
187 };
188
189 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP