|
0
|
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 };
|
