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 ShenandoahSATBMarkQueueSet _satb_mark_queue_set;
45
46 public:
47 ShenandoahBarrierSet(ShenandoahHeap* heap);
48
49 static ShenandoahBarrierSetAssembler* assembler();
50
51 inline static ShenandoahBarrierSet* barrier_set() {
52 return barrier_set_cast<ShenandoahBarrierSet>(BarrierSet::barrier_set());
53 }
54
55 static ShenandoahSATBMarkQueueSet& satb_mark_queue_set() {
56 return barrier_set()->_satb_mark_queue_set;
57 }
58
59 void print_on(outputStream* st) const;
60
61 bool is_a(BarrierSet::Name bsn);
62
63 bool is_aligned(HeapWord* hw);
64
65 void write_ref_array(HeapWord* start, size_t count);
66
67 template <class T> void
68 write_ref_array_pre_work(T* dst, size_t count);
69
70 void write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized);
71
72 void write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized);
73
74 // We export this to make it available in cases where the static
75 // type of the barrier set is known. Note that it is non-virtual.
76 template <class T> inline void inline_write_ref_field_pre(T* field, oop new_val);
77
78 // These are the more general virtual versions.
79 void write_ref_field_pre_work(oop* field, oop new_val);
80 void write_ref_field_pre_work(narrowOop* field, oop new_val);
81 void write_ref_field_pre_work(void* field, oop new_val);
82
83 void write_ref_field_work(void* v, oop o, bool release = false);
84 void write_region(MemRegion mr);
85
86 virtual void on_thread_create(Thread* thread);
87 virtual void on_thread_destroy(Thread* thread);
88 virtual void on_thread_attach(Thread* thread);
89 virtual void on_thread_detach(Thread* thread);
90
91 static inline oop resolve_forwarded_not_null(oop p);
92 static inline oop resolve_forwarded(oop p);
93
94 void storeval_barrier(oop obj);
95 void keep_alive_barrier(oop obj);
96
97 oop load_reference_barrier(oop obj);
98 oop load_reference_barrier_mutator(oop obj);
99 oop load_reference_barrier_not_null(oop obj);
100
101 void enqueue(oop obj);
102
103 private:
104 template <class T, bool STOREVAL_WRITE_BARRIER>
105 void write_ref_array_loop(HeapWord* start, size_t count);
106
107 oop load_reference_barrier_impl(oop obj);
108
109 static void keep_alive_if_weak(DecoratorSet decorators, oop value) {
110 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
111 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0;
112 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0;
113 if (!peek && !on_strong_oop_ref && value != NULL) {
114 ShenandoahBarrierSet::barrier_set()->keep_alive_barrier(value);
115 }
116 }
117
118 template <typename T>
119 bool arraycopy_loop_1(T* src, T* dst, size_t length, Klass* bound,
120 bool checkcast, bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode);
121
122 template <typename T, bool CHECKCAST>
123 bool arraycopy_loop_2(T* src, T* dst, size_t length, Klass* bound,
124 bool satb, bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode);
125
126 template <typename T, bool CHECKCAST, bool SATB>
127 bool arraycopy_loop_3(T* src, T* dst, size_t length, Klass* bound,
128 bool disjoint, ShenandoahBarrierSet::ArrayCopyStoreValMode storeval_mode);
129
130 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
131 bool arraycopy_loop(T* src, T* dst, size_t length, Klass* bound, bool disjoint);
132
133 template <typename T, bool CHECKCAST, bool SATB, ShenandoahBarrierSet::ArrayCopyStoreValMode STOREVAL_MODE>
134 bool arraycopy_element(T* cur_src, T* cur_dst, Klass* bound, Thread* const thread, ShenandoahMarkingContext* const ctx);
135
136 public:
137 // Callbacks for runtime accesses.
138 template <DecoratorSet decorators, typename BarrierSetT = ShenandoahBarrierSet>
139 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
140 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
141
142 template <typename T>
143 static oop oop_atomic_cmpxchg_in_heap_impl(oop new_value, T* addr, oop compare_value);
144
145 template <typename T>
146 static oop oop_atomic_xchg_in_heap_impl(oop new_value, T* addr);
147
148 public:
149 // Heap oop accesses. These accessors get resolved when
150 // IN_HEAP is set (e.g. when using the HeapAccess API), it is
151 // an oop_* overload, and the barrier strength is AS_NORMAL.
152 template <typename T>
153 static oop oop_load_in_heap(T* addr);
154 static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);
155
156 template <typename T>
157 static void oop_store_in_heap(T* addr, oop value);
158 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value);
159
160 template <typename T>
161 static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value);
162 static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value);
163
164 template <typename T>
165 static oop oop_atomic_xchg_in_heap(oop new_value, T* addr);
166 static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset);
167
168 template <typename T>
169 static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
170 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
171 size_t length);
172
173 // Clone barrier support
174 static void clone_in_heap(oop src, oop dst, size_t size);
175
176 // Needed for loads on non-heap weak references
177 template <typename T>
178 static oop oop_load_not_in_heap(T* addr);
179
180 template <typename T>
181 static oop oop_atomic_cmpxchg_not_in_heap(oop new_value, T* addr, oop compare_value);
182
183 template <typename T>
184 static oop oop_atomic_xchg_not_in_heap(oop new_value, T* addr);
185
186 };
187
188 };
189
190 template<>
191 struct BarrierSet::GetName<ShenandoahBarrierSet> {
192 static const BarrierSet::Name value = BarrierSet::ShenandoahBarrierSet;
193 };
194
195 template<>
196 struct BarrierSet::GetType<BarrierSet::ShenandoahBarrierSet> {
197 typedef ::ShenandoahBarrierSet type;
198 };
199
200 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP