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/shenandoah/shenandoahHeap.hpp"
28 #include "gc/shared/barrierSet.hpp"
29
30 class ShenandoahBarrierSet: public BarrierSet {
31 private:
32
33 ShenandoahHeap* _heap;
34
35 public:
36
37 ShenandoahBarrierSet(ShenandoahHeap* heap);
38
39 void print_on(outputStream* st) const;
40
41 bool is_a(BarrierSet::Name bsn);
42
43 bool has_read_prim_array_opt();
44 bool has_read_prim_barrier();
45 bool has_read_ref_array_opt();
46 bool has_read_ref_barrier();
47 bool has_read_region_opt();
48 bool has_write_prim_array_opt();
49 bool has_write_prim_barrier();
50 bool has_write_ref_array_opt();
51 bool has_write_ref_barrier();
52 bool has_write_ref_pre_barrier();
53 bool has_write_region_opt();
54 bool is_aligned(HeapWord* hw);
55 void read_prim_array(MemRegion mr);
56 void read_prim_field(HeapWord* hw, size_t s);
57 bool read_prim_needs_barrier(HeapWord* hw, size_t s);
58 void read_ref_array(MemRegion mr);
59
60 void read_ref_field(void* v);
61
62 bool read_ref_needs_barrier(void* v);
63 void read_region(MemRegion mr);
64 void resize_covered_region(MemRegion mr);
65 void write_prim_array(MemRegion mr);
66 void write_prim_field(HeapWord* hw, size_t s , juint x, juint y);
67 bool write_prim_needs_barrier(HeapWord* hw, size_t s, juint x, juint y);
68 void write_ref_array(HeapWord* start, size_t count);
69 void write_ref_array_work(MemRegion r);
70
71 template <class T> void
72 write_ref_array_pre_work(T* dst, int count);
73
74 void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized);
75
76 void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized);
77
78
79 template <class T> static void write_ref_field_pre_static(T* field, oop newVal);
80
81 // We export this to make it available in cases where the static
82 // type of the barrier set is known. Note that it is non-virtual.
83 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal);
84
85 // These are the more general virtual versions.
86 void write_ref_field_pre_work(oop* field, oop new_val);
87 void write_ref_field_pre_work(narrowOop* field, oop new_val);
88 void write_ref_field_pre_work(void* field, oop new_val);
89
90 void write_ref_field_work(void* v, oop o, bool release = false);
91 void write_region_work(MemRegion mr);
92
93 virtual oop read_barrier(oop src);
94
95 static inline oop resolve_oop_static_not_null(oop p);
96
97 static inline oop resolve_oop_static(oop p);
98
99 virtual oop write_barrier(oop obj);
100 static oopDesc* write_barrier_IRT(oopDesc* src);
101 static oopDesc* write_barrier_JRT(oopDesc* src);
102
103 virtual oop storeval_barrier(oop obj);
104
105 bool obj_equals(oop obj1, oop obj2);
106 bool obj_equals(narrowOop obj1, narrowOop obj2);
107
108 #ifdef ASSERT
109 virtual bool is_safe(oop o);
110 virtual bool is_safe(narrowOop o);
111 virtual void verify_safe_oop(oop p);
112 #endif
113
114 private:
115 bool need_update_refs_barrier();
116
117 template <class T, bool UPDATE_MATRIX>
118 void write_ref_array_loop(HeapWord* start, size_t count);
119
120 #ifndef CC_INTERP
121 public:
122 void interpreter_read_barrier(MacroAssembler* masm, Register dst);
123 void interpreter_read_barrier_not_null(MacroAssembler* masm, Register dst);
124 void interpreter_write_barrier(MacroAssembler* masm, Register dst);
125 void interpreter_storeval_barrier(MacroAssembler* masm, Register dst);
126 void asm_acmp_barrier(MacroAssembler* masm, Register op1, Register op2);
127
128 private:
129 void interpreter_read_barrier_impl(MacroAssembler* masm, Register dst);
130 void interpreter_read_barrier_not_null_impl(MacroAssembler* masm, Register dst);
131
132 #endif
133 };
134
135 #endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHBARRIERSET_HPP