Wed, 15 Feb 2012 10:12:55 -0800
7145537: minor tweaks to LogEvents
Reviewed-by: kvn, twisti
1 /*
2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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
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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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_MEMORY_GENOOPCLOSURES_HPP
26 #define SHARE_VM_MEMORY_GENOOPCLOSURES_HPP
28 #include "memory/iterator.hpp"
29 #include "oops/oop.hpp"
31 class Generation;
32 class HeapWord;
33 class CardTableRS;
34 class CardTableModRefBS;
35 class DefNewGeneration;
37 template<class E, unsigned int N> class GenericTaskQueue;
38 typedef GenericTaskQueue<oop, TASKQUEUE_SIZE> OopTaskQueue;
39 template<class T> class GenericTaskQueueSet;
40 typedef GenericTaskQueueSet<OopTaskQueue> OopTaskQueueSet;
42 // Closure for iterating roots from a particular generation
43 // Note: all classes deriving from this MUST call this do_barrier
44 // method at the end of their own do_oop method!
45 // Note: no do_oop defined, this is an abstract class.
47 class OopsInGenClosure : public OopClosure {
48 private:
49 Generation* _orig_gen; // generation originally set in ctor
50 Generation* _gen; // generation being scanned
52 protected:
53 // Some subtypes need access.
54 HeapWord* _gen_boundary; // start of generation
55 CardTableRS* _rs; // remembered set
57 // For assertions
58 Generation* generation() { return _gen; }
59 CardTableRS* rs() { return _rs; }
61 // Derived classes that modify oops so that they might be old-to-young
62 // pointers must call the method below.
63 template <class T> void do_barrier(T* p);
65 // Version for use by closures that may be called in parallel code.
66 template <class T> void par_do_barrier(T* p);
68 public:
69 OopsInGenClosure() : OopClosure(NULL),
70 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {};
72 OopsInGenClosure(Generation* gen);
73 void set_generation(Generation* gen);
75 void reset_generation() { _gen = _orig_gen; }
77 // Problem with static closures: must have _gen_boundary set at some point,
78 // but cannot do this until after the heap is initialized.
79 void set_orig_generation(Generation* gen) {
80 _orig_gen = gen;
81 set_generation(gen);
82 }
84 HeapWord* gen_boundary() { return _gen_boundary; }
85 };
87 // Closure for scanning DefNewGeneration.
88 //
89 // This closure will perform barrier store calls for ALL
90 // pointers in scanned oops.
91 class ScanClosure: public OopsInGenClosure {
92 protected:
93 DefNewGeneration* _g;
94 HeapWord* _boundary;
95 bool _gc_barrier;
96 template <class T> inline void do_oop_work(T* p);
97 public:
98 ScanClosure(DefNewGeneration* g, bool gc_barrier);
99 virtual void do_oop(oop* p);
100 virtual void do_oop(narrowOop* p);
101 inline void do_oop_nv(oop* p);
102 inline void do_oop_nv(narrowOop* p);
103 bool do_header() { return false; }
104 Prefetch::style prefetch_style() {
105 return Prefetch::do_write;
106 }
107 };
109 // Closure for scanning DefNewGeneration.
110 //
111 // This closure only performs barrier store calls on
112 // pointers into the DefNewGeneration. This is less
113 // precise, but faster, than a ScanClosure
114 class FastScanClosure: public OopsInGenClosure {
115 protected:
116 DefNewGeneration* _g;
117 HeapWord* _boundary;
118 bool _gc_barrier;
119 template <class T> inline void do_oop_work(T* p);
120 public:
121 FastScanClosure(DefNewGeneration* g, bool gc_barrier);
122 virtual void do_oop(oop* p);
123 virtual void do_oop(narrowOop* p);
124 inline void do_oop_nv(oop* p);
125 inline void do_oop_nv(narrowOop* p);
126 bool do_header() { return false; }
127 Prefetch::style prefetch_style() {
128 return Prefetch::do_write;
129 }
130 };
132 class FilteringClosure: public OopClosure {
133 private:
134 HeapWord* _boundary;
135 OopClosure* _cl;
136 protected:
137 template <class T> inline void do_oop_work(T* p) {
138 T heap_oop = oopDesc::load_heap_oop(p);
139 if (!oopDesc::is_null(heap_oop)) {
140 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
141 if ((HeapWord*)obj < _boundary) {
142 _cl->do_oop(p);
143 }
144 }
145 }
146 public:
147 FilteringClosure(HeapWord* boundary, OopClosure* cl) :
148 OopClosure(cl->_ref_processor), _boundary(boundary),
149 _cl(cl) {}
150 virtual void do_oop(oop* p);
151 virtual void do_oop(narrowOop* p);
152 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); }
154 bool do_header() { return false; }
155 };
157 // Closure for scanning DefNewGeneration's weak references.
158 // NOTE: very much like ScanClosure but not derived from
159 // OopsInGenClosure -- weak references are processed all
160 // at once, with no notion of which generation they were in.
161 class ScanWeakRefClosure: public OopClosure {
162 protected:
163 DefNewGeneration* _g;
164 HeapWord* _boundary;
165 template <class T> inline void do_oop_work(T* p);
166 public:
167 ScanWeakRefClosure(DefNewGeneration* g);
168 virtual void do_oop(oop* p);
169 virtual void do_oop(narrowOop* p);
170 inline void do_oop_nv(oop* p);
171 inline void do_oop_nv(narrowOop* p);
172 };
174 class VerifyOopClosure: public OopClosure {
175 protected:
176 template <class T> inline void do_oop_work(T* p) {
177 oop obj = oopDesc::load_decode_heap_oop(p);
178 guarantee(obj->is_oop_or_null(), err_msg("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj));
179 }
180 public:
181 virtual void do_oop(oop* p);
182 virtual void do_oop(narrowOop* p);
183 static VerifyOopClosure verify_oop;
184 };
186 #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_HPP