1 /* |
1 /* |
2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
5 * This code is free software; you can redistribute it and/or modify it |
6 * under the terms of the GNU General Public License version 2 only, as |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
31 class Generation; |
31 class Generation; |
32 class HeapWord; |
32 class HeapWord; |
33 class CardTableRS; |
33 class CardTableRS; |
34 class CardTableModRefBS; |
34 class CardTableModRefBS; |
35 class DefNewGeneration; |
35 class DefNewGeneration; |
|
36 class KlassRemSet; |
36 |
37 |
37 template<class E, MEMFLAGS F, unsigned int N> class GenericTaskQueue; |
38 template<class E, MEMFLAGS F, unsigned int N> class GenericTaskQueue; |
38 typedef GenericTaskQueue<oop, mtGC, TASKQUEUE_SIZE> OopTaskQueue; |
39 typedef GenericTaskQueue<oop, mtGC, TASKQUEUE_SIZE> OopTaskQueue; |
39 template<class T, MEMFLAGS F> class GenericTaskQueueSet; |
40 template<class T, MEMFLAGS F> class GenericTaskQueueSet; |
40 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet; |
41 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet; |
42 // Closure for iterating roots from a particular generation |
43 // Closure for iterating roots from a particular generation |
43 // Note: all classes deriving from this MUST call this do_barrier |
44 // Note: all classes deriving from this MUST call this do_barrier |
44 // method at the end of their own do_oop method! |
45 // method at the end of their own do_oop method! |
45 // Note: no do_oop defined, this is an abstract class. |
46 // Note: no do_oop defined, this is an abstract class. |
46 |
47 |
47 class OopsInGenClosure : public OopClosure { |
48 class OopsInGenClosure : public ExtendedOopClosure { |
48 private: |
49 private: |
49 Generation* _orig_gen; // generation originally set in ctor |
50 Generation* _orig_gen; // generation originally set in ctor |
50 Generation* _gen; // generation being scanned |
51 Generation* _gen; // generation being scanned |
51 |
52 |
52 protected: |
53 protected: |
64 |
65 |
65 // Version for use by closures that may be called in parallel code. |
66 // Version for use by closures that may be called in parallel code. |
66 template <class T> void par_do_barrier(T* p); |
67 template <class T> void par_do_barrier(T* p); |
67 |
68 |
68 public: |
69 public: |
69 OopsInGenClosure() : OopClosure(NULL), |
70 OopsInGenClosure() : ExtendedOopClosure(NULL), |
70 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; |
71 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; |
71 |
72 |
72 OopsInGenClosure(Generation* gen); |
73 OopsInGenClosure(Generation* gen); |
73 void set_generation(Generation* gen); |
74 void set_generation(Generation* gen); |
74 |
75 |
80 _orig_gen = gen; |
81 _orig_gen = gen; |
81 set_generation(gen); |
82 set_generation(gen); |
82 } |
83 } |
83 |
84 |
84 HeapWord* gen_boundary() { return _gen_boundary; } |
85 HeapWord* gen_boundary() { return _gen_boundary; } |
|
86 |
|
87 }; |
|
88 |
|
89 // Super class for scan closures. It contains code to dirty scanned Klasses. |
|
90 class OopsInKlassOrGenClosure: public OopsInGenClosure { |
|
91 Klass* _scanned_klass; |
|
92 public: |
|
93 OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {} |
|
94 void set_scanned_klass(Klass* k) { |
|
95 assert(k == NULL || _scanned_klass == NULL, "Must be"); |
|
96 _scanned_klass = k; |
|
97 } |
|
98 bool is_scanning_a_klass() { return _scanned_klass != NULL; } |
|
99 void do_klass_barrier(); |
85 }; |
100 }; |
86 |
101 |
87 // Closure for scanning DefNewGeneration. |
102 // Closure for scanning DefNewGeneration. |
88 // |
103 // |
89 // This closure will perform barrier store calls for ALL |
104 // This closure will perform barrier store calls for ALL |
90 // pointers in scanned oops. |
105 // pointers in scanned oops. |
91 class ScanClosure: public OopsInGenClosure { |
106 class ScanClosure: public OopsInKlassOrGenClosure { |
92 protected: |
107 protected: |
93 DefNewGeneration* _g; |
108 DefNewGeneration* _g; |
94 HeapWord* _boundary; |
109 HeapWord* _boundary; |
95 bool _gc_barrier; |
110 bool _gc_barrier; |
96 template <class T> inline void do_oop_work(T* p); |
111 template <class T> inline void do_oop_work(T* p); |
98 ScanClosure(DefNewGeneration* g, bool gc_barrier); |
113 ScanClosure(DefNewGeneration* g, bool gc_barrier); |
99 virtual void do_oop(oop* p); |
114 virtual void do_oop(oop* p); |
100 virtual void do_oop(narrowOop* p); |
115 virtual void do_oop(narrowOop* p); |
101 inline void do_oop_nv(oop* p); |
116 inline void do_oop_nv(oop* p); |
102 inline void do_oop_nv(narrowOop* p); |
117 inline void do_oop_nv(narrowOop* p); |
103 bool do_header() { return false; } |
|
104 Prefetch::style prefetch_style() { |
118 Prefetch::style prefetch_style() { |
105 return Prefetch::do_write; |
119 return Prefetch::do_write; |
106 } |
120 } |
107 }; |
121 }; |
108 |
122 |
109 // Closure for scanning DefNewGeneration. |
123 // Closure for scanning DefNewGeneration. |
110 // |
124 // |
111 // This closure only performs barrier store calls on |
125 // This closure only performs barrier store calls on |
112 // pointers into the DefNewGeneration. This is less |
126 // pointers into the DefNewGeneration. This is less |
113 // precise, but faster, than a ScanClosure |
127 // precise, but faster, than a ScanClosure |
114 class FastScanClosure: public OopsInGenClosure { |
128 class FastScanClosure: public OopsInKlassOrGenClosure { |
115 protected: |
129 protected: |
116 DefNewGeneration* _g; |
130 DefNewGeneration* _g; |
117 HeapWord* _boundary; |
131 HeapWord* _boundary; |
118 bool _gc_barrier; |
132 bool _gc_barrier; |
119 template <class T> inline void do_oop_work(T* p); |
133 template <class T> inline void do_oop_work(T* p); |
121 FastScanClosure(DefNewGeneration* g, bool gc_barrier); |
135 FastScanClosure(DefNewGeneration* g, bool gc_barrier); |
122 virtual void do_oop(oop* p); |
136 virtual void do_oop(oop* p); |
123 virtual void do_oop(narrowOop* p); |
137 virtual void do_oop(narrowOop* p); |
124 inline void do_oop_nv(oop* p); |
138 inline void do_oop_nv(oop* p); |
125 inline void do_oop_nv(narrowOop* p); |
139 inline void do_oop_nv(narrowOop* p); |
126 bool do_header() { return false; } |
|
127 Prefetch::style prefetch_style() { |
140 Prefetch::style prefetch_style() { |
128 return Prefetch::do_write; |
141 return Prefetch::do_write; |
129 } |
142 } |
130 }; |
143 }; |
131 |
144 |
132 class FilteringClosure: public OopClosure { |
145 class KlassScanClosure: public KlassClosure { |
|
146 OopsInKlassOrGenClosure* _scavenge_closure; |
|
147 // true if the the modified oops state should be saved. |
|
148 bool _accumulate_modified_oops; |
|
149 public: |
|
150 KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure, |
|
151 KlassRemSet* klass_rem_set_policy); |
|
152 void do_klass(Klass* k); |
|
153 }; |
|
154 |
|
155 class FilteringClosure: public ExtendedOopClosure { |
133 private: |
156 private: |
134 HeapWord* _boundary; |
157 HeapWord* _boundary; |
135 OopClosure* _cl; |
158 ExtendedOopClosure* _cl; |
136 protected: |
159 protected: |
137 template <class T> inline void do_oop_work(T* p) { |
160 template <class T> inline void do_oop_work(T* p) { |
138 T heap_oop = oopDesc::load_heap_oop(p); |
161 T heap_oop = oopDesc::load_heap_oop(p); |
139 if (!oopDesc::is_null(heap_oop)) { |
162 if (!oopDesc::is_null(heap_oop)) { |
140 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
163 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
142 _cl->do_oop(p); |
165 _cl->do_oop(p); |
143 } |
166 } |
144 } |
167 } |
145 } |
168 } |
146 public: |
169 public: |
147 FilteringClosure(HeapWord* boundary, OopClosure* cl) : |
170 FilteringClosure(HeapWord* boundary, ExtendedOopClosure* cl) : |
148 OopClosure(cl->_ref_processor), _boundary(boundary), |
171 ExtendedOopClosure(cl->_ref_processor), _boundary(boundary), |
149 _cl(cl) {} |
172 _cl(cl) {} |
150 virtual void do_oop(oop* p); |
173 virtual void do_oop(oop* p); |
151 virtual void do_oop(narrowOop* p); |
174 virtual void do_oop(narrowOop* p); |
152 inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } |
175 inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } |
153 inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
176 inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
154 bool do_header() { return false; } |
177 virtual bool do_metadata() { return do_metadata_nv(); } |
|
178 inline bool do_metadata_nv() { assert(!_cl->do_metadata(), "assumption broken, must change to 'return _cl->do_metadata()'"); return false; } |
155 }; |
179 }; |
156 |
180 |
157 // Closure for scanning DefNewGeneration's weak references. |
181 // Closure for scanning DefNewGeneration's weak references. |
158 // NOTE: very much like ScanClosure but not derived from |
182 // NOTE: very much like ScanClosure but not derived from |
159 // OopsInGenClosure -- weak references are processed all |
183 // OopsInGenClosure -- weak references are processed all |