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 "memory/barrierSet.hpp"
28
29 class ShenandoahHeap;
30
31 class ShenandoahBarrierSet: public BarrierSet {
32 private:
33
34 ShenandoahHeap* _heap;
35
36 public:
37
38 ShenandoahBarrierSet(ShenandoahHeap* heap);
39
40 inline static ShenandoahBarrierSet* barrier_set() {
41 BarrierSet *bs = oopDesc::bs();
42 assert(bs->kind() == BarrierSet::ShenandoahBarrierSet, "sanity");
43 return (ShenandoahBarrierSet*)bs;
44 }
45
46 void print_on(outputStream* st) const;
47
48 bool is_a(BarrierSet::Name bsn);
49
50 bool has_read_prim_array_opt();
51 bool has_read_prim_barrier();
52 bool has_read_ref_array_opt();
53 bool has_read_ref_barrier();
54 bool has_read_region_opt();
55 bool has_write_prim_array_opt();
56 bool has_write_prim_barrier();
57 bool has_write_ref_array_opt();
58 bool has_write_ref_barrier();
59 bool has_write_ref_pre_barrier();
60 bool has_write_region_opt();
61 bool is_aligned(HeapWord* hw);
62 void read_prim_array(MemRegion mr);
63 void read_prim_field(HeapWord* hw, size_t s);
64 bool read_prim_needs_barrier(HeapWord* hw, size_t s);
65 void read_ref_array(MemRegion mr);
66
67 void read_ref_field(void* v);
68
69 bool read_ref_needs_barrier(void* v);
70 void read_region(MemRegion mr);
71 void resize_covered_region(MemRegion mr);
72 void write_prim_array(MemRegion mr);
73 void write_prim_field(HeapWord* hw, size_t s , juint x, juint y);
74 bool write_prim_needs_barrier(HeapWord* hw, size_t s, juint x, juint y);
75 void write_ref_array(HeapWord* start, size_t count);
76 void write_ref_array_work(MemRegion r);
77
78 template <class T> void
79 write_ref_array_pre_work(T* dst, size_t count);
80
81 void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized);
82
83 void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized);
84
85
86 template <class T> static void write_ref_field_pre_static(T* field, oop newVal);
87
88 // We export this to make it available in cases where the static
89 // type of the barrier set is known. Note that it is non-virtual.
90 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal);
91
92 // These are the more general virtual versions.
93 void write_ref_field_pre_work(oop* field, oop new_val);
94 void write_ref_field_pre_work(narrowOop* field, oop new_val);
95 void write_ref_field_pre_work(void* field, oop new_val);
96
97 void write_ref_field_work(void* v, oop o, bool release = false);
98 void write_region_work(MemRegion mr);
99
100 virtual oop read_barrier(oop src);
101
102 static inline oop resolve_forwarded_not_null(oop p);
103 static inline oop resolve_forwarded(oop p);
104
105 virtual oop write_barrier(oop obj);
106 static oopDesc* write_barrier_IRT(oopDesc* src);
107 static oopDesc* write_barrier_JRT(oopDesc* src);
108
109 oop write_barrier_mutator(oop obj);
110
111 bool obj_equals(oop obj1, oop obj2);
112 bool obj_equals(narrowOop obj1, narrowOop obj2);
113
114 void enqueue(oop obj);
115
116 private:
117 inline bool need_update_refs_barrier();
118
119 template <class T>
120 void write_ref_array_loop(HeapWord* start, size_t count);
121
122 #ifndef CC_INTERP
123 public:
124 virtual void interpreter_read_barrier(MacroAssembler* masm, Register dst);
125 virtual void interpreter_read_barrier_not_null(MacroAssembler* masm, Register dst);
126 void interpreter_write_barrier(MacroAssembler* masm, Register dst);
127 void asm_acmp_barrier(MacroAssembler* masm, Register op1, Register op2);
128
129 #endif
130 };
131
132 #endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP