Mercurial > hg > graal-jvmci-8
comparison src/share/vm/memory/genOopClosures.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | ba764ed4b6f2 |
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1 /* | |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
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 | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class Generation; | |
26 class HeapWord; | |
27 class CardTableRS; | |
28 class CardTableModRefBS; | |
29 class DefNewGeneration; | |
30 | |
31 // Closure for iterating roots from a particular generation | |
32 // Note: all classes deriving from this MUST call this do_barrier | |
33 // method at the end of their own do_oop method! | |
34 // Note: no do_oop defined, this is an abstract class. | |
35 | |
36 class OopsInGenClosure : public OopClosure { | |
37 private: | |
38 Generation* _orig_gen; // generation originally set in ctor | |
39 Generation* _gen; // generation being scanned | |
40 | |
41 protected: | |
42 // Some subtypes need access. | |
43 HeapWord* _gen_boundary; // start of generation | |
44 CardTableRS* _rs; // remembered set | |
45 | |
46 // For assertions | |
47 Generation* generation() { return _gen; } | |
48 CardTableRS* rs() { return _rs; } | |
49 | |
50 // Derived classes that modify oops so that they might be old-to-young | |
51 // pointers must call the method below. | |
52 void do_barrier(oop* p); | |
53 | |
54 public: | |
55 OopsInGenClosure() : OopClosure(NULL), | |
56 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; | |
57 | |
58 OopsInGenClosure(Generation* gen); | |
59 void set_generation(Generation* gen); | |
60 | |
61 void reset_generation() { _gen = _orig_gen; } | |
62 | |
63 // Problem with static closures: must have _gen_boundary set at some point, | |
64 // but cannot do this until after the heap is initialized. | |
65 void set_orig_generation(Generation* gen) { | |
66 _orig_gen = gen; | |
67 set_generation(gen); | |
68 } | |
69 | |
70 HeapWord* gen_boundary() { return _gen_boundary; } | |
71 }; | |
72 | |
73 // Closure for scanning DefNewGeneration. | |
74 // | |
75 // This closure will perform barrier store calls for ALL | |
76 // pointers in scanned oops. | |
77 class ScanClosure: public OopsInGenClosure { | |
78 protected: | |
79 DefNewGeneration* _g; | |
80 HeapWord* _boundary; | |
81 bool _gc_barrier; | |
82 public: | |
83 ScanClosure(DefNewGeneration* g, bool gc_barrier); | |
84 void do_oop(oop* p); | |
85 void do_oop_nv(oop* p); | |
86 bool do_header() { return false; } | |
87 Prefetch::style prefetch_style() { | |
88 return Prefetch::do_write; | |
89 } | |
90 }; | |
91 | |
92 // Closure for scanning DefNewGeneration. | |
93 // | |
94 // This closure only performs barrier store calls on | |
95 // pointers into the DefNewGeneration. This is less | |
96 // precise, but faster, than a ScanClosure | |
97 class FastScanClosure: public OopsInGenClosure { | |
98 protected: | |
99 DefNewGeneration* _g; | |
100 HeapWord* _boundary; | |
101 bool _gc_barrier; | |
102 public: | |
103 FastScanClosure(DefNewGeneration* g, bool gc_barrier); | |
104 void do_oop(oop* p); | |
105 void do_oop_nv(oop* p); | |
106 bool do_header() { return false; } | |
107 Prefetch::style prefetch_style() { | |
108 return Prefetch::do_write; | |
109 } | |
110 }; | |
111 | |
112 class FilteringClosure: public OopClosure { | |
113 HeapWord* _boundary; | |
114 OopClosure* _cl; | |
115 public: | |
116 FilteringClosure(HeapWord* boundary, OopClosure* cl) : | |
117 OopClosure(cl->_ref_processor), _boundary(boundary), | |
118 _cl(cl) {} | |
119 void do_oop(oop* p); | |
120 void do_oop_nv(oop* p) { | |
121 oop obj = *p; | |
122 if ((HeapWord*)obj < _boundary && obj != NULL) { | |
123 _cl->do_oop(p); | |
124 } | |
125 } | |
126 bool do_header() { return false; } | |
127 }; | |
128 | |
129 // Closure for scanning DefNewGeneration's weak references. | |
130 // NOTE: very much like ScanClosure but not derived from | |
131 // OopsInGenClosure -- weak references are processed all | |
132 // at once, with no notion of which generation they were in. | |
133 class ScanWeakRefClosure: public OopClosure { | |
134 protected: | |
135 DefNewGeneration* _g; | |
136 HeapWord* _boundary; | |
137 public: | |
138 ScanWeakRefClosure(DefNewGeneration* g); | |
139 void do_oop(oop* p); | |
140 void do_oop_nv(oop* p); | |
141 }; | |
142 | |
143 class VerifyOopClosure: public OopClosure { | |
144 public: | |
145 void do_oop(oop* p) { | |
146 guarantee((*p)->is_oop_or_null(), "invalid oop"); | |
147 } | |
148 static VerifyOopClosure verify_oop; | |
149 }; |