1 /*
2 * Copyright (c) 2013, 2015, Red Hat, Inc. and/or its affiliates.
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_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP
25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP
26
27 #include "gc/shared/accessBarrierSupport.hpp"
28 #include "gc/shenandoah/shenandoahBaseBarrierSet.hpp"
29
30 class ShenandoahBarrierSet: public ShenandoahBaseBarrierSet {
31
32 public:
33
34 ShenandoahBarrierSet(ShenandoahHeap* heap);
35
36 void print_on(outputStream* st) const;
37
38 bool is_a(BarrierSet::Name bsn);
39
40 // We export this to make it available in cases where the static
41 // type of the barrier set is known. Note that it is non-virtual.
42 template <class T> inline void inline_write_ref_field_pre(T* field, oop new_val);
43
44 // These are the more general virtual versions.
45 void write_ref_field_pre_work(oop* field, oop new_val);
46 void write_ref_field_pre_work(narrowOop* field, oop new_val);
47 void write_ref_field_pre_work(void* field, oop new_val);
48
49 void write_ref_field_work(void* v, oop o, bool release = false);
50
51 public:
52 // Callbacks for runtime accesses.
53 template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet>
54 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
55 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
56
57 public:
58 // Primitive heap accesses. These accessors get resolved when
59 // IN_HEAP is set (e.g. when using the HeapAccess API), it is
60 // not an oop_* overload, and the barrier strength is AS_NORMAL.
61 template <typename T>
62 static T load_in_heap(T* addr) {
63 ShouldNotReachHere();
64 return Raw::template load<T>(addr);
65 }
66
67 template <typename T>
68 static T load_in_heap_at(oop base, ptrdiff_t offset) {
69 base = ShenandoahBaseBarrierSet::resolve_forwarded(base);
70 return Raw::template load_at<T>(base, offset);
71 }
72
73 template <typename T>
74 static void store_in_heap(T* addr, T value) {
75 ShouldNotReachHere();
76 Raw::store(addr, value);
77 }
78
79 template <typename T>
80 static void store_in_heap_at(oop base, ptrdiff_t offset, T value) {
81 base = ShenandoahBaseBarrierSet::barrier_set()->write_barrier(base);
82 Raw::store_at(base, offset, value);
83 }
84
85 template <typename T>
86 static T atomic_cmpxchg_in_heap(T new_value, T* addr, T compare_value) {
87 ShouldNotReachHere();
88 return Raw::atomic_cmpxchg(new_value, addr, compare_value);
89 }
90
91 template <typename T>
92 static T atomic_cmpxchg_in_heap_at(T new_value, oop base, ptrdiff_t offset, T compare_value) {
93 base = ShenandoahBaseBarrierSet::barrier_set()->write_barrier(base);
94 return Raw::atomic_cmpxchg_at(new_value, base, offset, compare_value);
95 }
96
97 template <typename T>
98 static T atomic_xchg_in_heap(T new_value, T* addr) {
99 ShouldNotReachHere();
100 return Raw::atomic_xchg(new_value, addr);
101 }
102
103 template <typename T>
104 static T atomic_xchg_in_heap_at(T new_value, oop base, ptrdiff_t offset) {
105 base = ShenandoahBaseBarrierSet::barrier_set()->write_barrier(base);
106 return Raw::atomic_xchg_at(new_value, base, offset);
107 }
108
109 template <typename T>
110 static void arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
111 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
112 size_t length);
113
114 // Heap oop accesses. These accessors get resolved when
115 // IN_HEAP is set (e.g. when using the HeapAccess API), it is
116 // an oop_* overload, and the barrier strength is AS_NORMAL.
117 template <typename T>
118 static oop oop_load_in_heap(T* addr) {
119 // ShouldNotReachHere();
120 oop value = Raw::template oop_load<oop>(addr);
121 keep_alive_if_weak(decorators, value);
122 return value;
123 }
124
125 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset) {
126 base = ShenandoahBaseBarrierSet::resolve_forwarded(base);
127 oop value = Raw::template oop_load_at<oop>(base, offset);
128 keep_alive_if_weak(AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset), value);
129 return value;
130 }
131
132 template <typename T>
133 static void oop_store_in_heap(T* addr, oop value) {
134 ShenandoahBaseBarrierSet::barrier_set()->write_ref_field_pre_work(addr, value);
135 Raw::oop_store(addr, value);
136 }
137
138 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) {
139 base = ShenandoahBaseBarrierSet::barrier_set()->write_barrier(base);
140 value = ShenandoahBaseBarrierSet::barrier_set()->storeval_barrier(value);
141
142 oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value);
143 }
144
145 template <typename T>
146 static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value);
147
148 static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
149 base = ShenandoahBaseBarrierSet::barrier_set()->write_barrier(base);
150 new_value = ShenandoahBaseBarrierSet::barrier_set()->storeval_barrier(new_value);
151 return oop_atomic_cmpxchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset), compare_value);
152 }
153
154 template <typename T>
155 static oop oop_atomic_xchg_in_heap(oop new_value, T* addr);
156
157 static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset) {
158 base = ShenandoahBaseBarrierSet::barrier_set()->write_barrier(base);
159 new_value = ShenandoahBaseBarrierSet::barrier_set()->storeval_barrier(new_value);
160 return oop_atomic_xchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset));
161 }
162
163 template <typename T>
164 static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
165 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
166 size_t length);
167
168 // Clone barrier support
169 static void clone_in_heap(oop src, oop dst, size_t size);
170
171 // Needed for loads on non-heap weak references
172 template <typename T>
173 static oop oop_load_not_in_heap(T* addr) {
174 oop value = Raw::oop_load_not_in_heap(addr);
175 keep_alive_if_weak(decorators, value);
176 return value;
177 }
178
179 static oop resolve(oop obj) {
180 return ShenandoahBaseBarrierSet::barrier_set()->write_barrier(obj);
181 }
182
183 static bool equals(oop o1, oop o2) {
184 return ShenandoahBaseBarrierSet::barrier_set()->obj_equals(o1, o2);
185 }
186
187 };
188
189 };
190
191 template<>
192 struct BarrierSet::GetName<ShenandoahBarrierSet> {
193 static const BarrierSet::Name value = BarrierSet::Shenandoah;
194 };
195
196 template<>
197 struct BarrierSet::GetType<BarrierSet::Shenandoah> {
198 typedef ::ShenandoahBarrierSet type;
199 };
200
201 #endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP