20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHNMETHOD_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHNMETHOD_HPP
27
28 #include "code/nmethod.hpp"
29 #include "gc/shenandoah/shenandoahHeap.hpp"
30 #include "gc/shenandoah/shenandoahLock.hpp"
31 #include "gc/shenandoah/shenandoahPadding.hpp"
32 #include "memory/allocation.hpp"
33 #include "runtime/atomic.hpp"
34 #include "utilities/growableArray.hpp"
35
36 // Use ShenandoahReentrantLock as ShenandoahNMethodLock
37 typedef ShenandoahReentrantLock<ShenandoahSimpleLock> ShenandoahNMethodLock;
38 typedef ShenandoahLocker<ShenandoahNMethodLock> ShenandoahNMethodLocker;
39
40 // ShenandoahNMethod tuple records the internal locations of oop slots within reclocation stream in
41 // the nmethod. This allows us to quickly scan the oops without doing the nmethod-internal scans,
42 // that sometimes involves parsing the machine code. Note it does not record the oops themselves,
43 // because it would then require handling these tuples as the new class of roots.
44 class ShenandoahNMethod : public CHeapObj<mtGC> {
45 private:
46 nmethod* const _nm;
47 oop** _oops;
48 int _oops_count;
49 bool _has_non_immed_oops;
50 bool _unregistered;
51 ShenandoahNMethodLock _lock;
52 ShenandoahNMethodLock _ic_lock;
53
54 public:
55 ShenandoahNMethod(nmethod *nm, GrowableArray<oop*>& oops, bool has_non_immed_oops);
56 ~ShenandoahNMethod();
57
58 inline nmethod* nm() const;
59 inline ShenandoahNMethodLock* lock();
60 inline ShenandoahNMethodLock* ic_lock();
61 inline void oops_do(OopClosure* oops, bool fix_relocations = false);
62 // Update oops when the nmethod is re-registered
63 void update();
64
65 inline bool is_unregistered() const;
66
67 static ShenandoahNMethod* for_nmethod(nmethod* nm);
68 static inline ShenandoahNMethodLock* lock_for_nmethod(nmethod* nm);
69 static inline ShenandoahNMethodLock* ic_lock_for_nmethod(nmethod* nm);
70
71 static void heal_nmethod(nmethod* nm);
72 static inline void heal_nmethod_metadata(ShenandoahNMethod* nmethod_data);
73 static inline void disarm_nmethod(nmethod* nm);
74
75 static inline ShenandoahNMethod* gc_data(nmethod* nm);
76 static inline void attach_gc_data(nmethod* nm, ShenandoahNMethod* gc_data);
77
78 void assert_correct() NOT_DEBUG_RETURN;
79 void assert_same_oops() NOT_DEBUG_RETURN;
80
81 private:
82 static void detect_reloc_oops(nmethod* nm, GrowableArray<oop*>& oops, bool& _has_non_immed_oops);
83 };
84
85 class ShenandoahNMethodTable;
86
87 // ShenandoahNMethodList holds registered nmethod data. The list is reference counted.
88 class ShenandoahNMethodList : public CHeapObj<mtGC> {
89 private:
90 ShenandoahNMethod** _list;
91 const int _size;
92 uint _ref_count;
93
94 private:
95 ~ShenandoahNMethodList();
96
97 public:
98 ShenandoahNMethodList(int size);
99
100 // Reference counting with CoceCache_lock held
101 ShenandoahNMethodList* acquire();
102 void release();
|
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHNMETHOD_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHNMETHOD_HPP
27
28 #include "code/nmethod.hpp"
29 #include "gc/shenandoah/shenandoahHeap.hpp"
30 #include "gc/shenandoah/shenandoahLock.hpp"
31 #include "gc/shenandoah/shenandoahPadding.hpp"
32 #include "memory/allocation.hpp"
33 #include "runtime/atomic.hpp"
34 #include "utilities/growableArray.hpp"
35
36 // Use ShenandoahReentrantLock as ShenandoahNMethodLock
37 typedef ShenandoahReentrantLock<ShenandoahSimpleLock> ShenandoahNMethodLock;
38 typedef ShenandoahLocker<ShenandoahNMethodLock> ShenandoahNMethodLocker;
39
40 struct ShenandoahNMethodBarrier {
41 address _pc;
42 address _stub_addr;
43 int _index;
44 };
45
46 // ShenandoahNMethod tuple records the internal locations of oop slots within reclocation stream in
47 // the nmethod. This allows us to quickly scan the oops without doing the nmethod-internal scans,
48 // that sometimes involves parsing the machine code. Note it does not record the oops themselves,
49 // because it would then require handling these tuples as the new class of roots.
50 class ShenandoahNMethod : public CHeapObj<mtGC> {
51 private:
52 nmethod* const _nm;
53 oop** _oops;
54 int _oops_count;
55 ShenandoahNMethodBarrier* _barriers;
56 int _barriers_count;
57 bool _has_non_immed_oops;
58 bool _unregistered;
59 ShenandoahNMethodLock _lock;
60 ShenandoahNMethodLock _ic_lock;
61
62 enum ShenandoahNMethodGCState {
63 FORWARDED = ShenandoahHeap::HAS_FORWARDED,
64 MARKING = ShenandoahHeap::MARKING,
65 WEAK = ShenandoahHeap::WEAK_ROOTS,
66 FORWARDED_MARKING = ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::MARKING,
67 FORWARDED_WEAK = ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::WEAK_ROOTS,
68 MARKING_WEAK = ShenandoahHeap::MARKING | ShenandoahHeap::WEAK_ROOTS,
69 FORWARDED_MARKING_WEAK = ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::MARKING | ShenandoahHeap::WEAK_ROOTS
70 };
71
72 enum ShenandoahNMethodGCStatePos {
73 POS_FORWARDED = 0,
74 POS_MARKING = 1,
75 POS_WEAK = 2,
76 POS_FORWARDED_MARKING = 3,
77 POS_FORWARDED_WEAK = 4,
78 POS_MARKING_WEAK = 5,
79 POS_FORWARDED_MARKING_WEAK = 6,
80 POS_MAX
81 };
82
83 public:
84 ShenandoahNMethod(nmethod *nm);
85 ~ShenandoahNMethod();
86
87 static int gc_state_to_reloc(char gc_state) {
88 if (gc_state == FORWARDED) return POS_FORWARDED;
89 if (gc_state == MARKING) return POS_MARKING;
90 if (gc_state == WEAK) return POS_WEAK;
91 if (gc_state == FORWARDED_MARKING) return POS_FORWARDED_MARKING;
92 if (gc_state == FORWARDED_WEAK) return POS_FORWARDED_WEAK;
93 if (gc_state == MARKING_WEAK) return POS_MARKING_WEAK;
94 if (gc_state == FORWARDED_MARKING_WEAK) return POS_FORWARDED_MARKING_WEAK;
95 ShouldNotReachHere();
96 return 0;
97 }
98
99 static char reloc_to_gc_state(int index) {
100 if (index == POS_FORWARDED) return FORWARDED;
101 if (index == POS_MARKING) return MARKING;
102 if (index == POS_WEAK) return WEAK;
103 if (index == POS_FORWARDED_MARKING) return FORWARDED_MARKING;
104 if (index == POS_FORWARDED_WEAK) return FORWARDED_WEAK;
105 if (index == POS_MARKING_WEAK) return MARKING_WEAK;
106 if (index == POS_FORWARDED_MARKING_WEAK) return FORWARDED_MARKING_WEAK;
107 ShouldNotReachHere();
108 return 0;
109 }
110
111 inline nmethod* nm() const;
112 inline ShenandoahNMethodLock* lock();
113 inline ShenandoahNMethodLock* ic_lock();
114 inline void oops_do(OopClosure* oops, bool fix_relocations = false);
115 // Update oops when the nmethod is re-registered
116 void update();
117
118 inline bool is_unregistered() const;
119
120 static ShenandoahNMethod* for_nmethod(nmethod* nm);
121 static inline ShenandoahNMethodLock* lock_for_nmethod(nmethod* nm);
122 static inline ShenandoahNMethodLock* ic_lock_for_nmethod(nmethod* nm);
123
124 static void heal_nmethod(nmethod* nm);
125 static void update_barriers(nmethod* nm);
126 static inline void heal_nmethod_metadata(ShenandoahNMethod* nmethod_data);
127 static inline void complete_and_disarm_nmethod(nmethod* nm);
128 static inline void complete_and_disarm_nmethod_unlocked(nmethod* nm);
129
130 static inline ShenandoahNMethod* gc_data(nmethod* nm);
131 static inline void attach_gc_data(nmethod* nm, ShenandoahNMethod* gc_data);
132
133 static void assert_barriers(nmethod* nm, bool armed) NOT_DEBUG_RETURN;
134 void assert_correct() NOT_DEBUG_RETURN;
135 void assert_same_oops() NOT_DEBUG_RETURN;
136
137 private:
138 void init_from(nmethod* nm);
139 static void parse(nmethod* nm, GrowableArray<oop*>& oops, bool& _has_non_immed_oops, GrowableArray<ShenandoahNMethodBarrier>& barriers);
140 };
141
142 class ShenandoahNMethodTable;
143
144 // ShenandoahNMethodList holds registered nmethod data. The list is reference counted.
145 class ShenandoahNMethodList : public CHeapObj<mtGC> {
146 private:
147 ShenandoahNMethod** _list;
148 const int _size;
149 uint _ref_count;
150
151 private:
152 ~ShenandoahNMethodList();
153
154 public:
155 ShenandoahNMethodList(int size);
156
157 // Reference counting with CoceCache_lock held
158 ShenandoahNMethodList* acquire();
159 void release();
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