Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/concurrentMarkSweep/promotionInfo.hpp @ 1521:a8127dc669ba
6951188: CMS: move PromotionInfo into its own file
Summary: Moved PromotionInfo and friends into new files promotionInfo.{h,c}pp from their previous compactibleFreeListSpace.{h,c}pp home.
Reviewed-by: apetrusenko
author | ysr |
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date | Mon, 10 May 2010 12:31:52 -0700 |
parents | |
children | a00b51b2dda4 |
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1 /* | |
2 * Copyright 2001-2009 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 // Forward declarations | |
26 class CompactibleFreeListSpace; | |
27 | |
28 class PromotedObject VALUE_OBJ_CLASS_SPEC { | |
29 private: | |
30 enum { | |
31 promoted_mask = right_n_bits(2), // i.e. 0x3 | |
32 displaced_mark = nth_bit(2), // i.e. 0x4 | |
33 next_mask = ~(right_n_bits(3)) // i.e. ~(0x7) | |
34 }; | |
35 intptr_t _next; | |
36 public: | |
37 inline PromotedObject* next() const { | |
38 return (PromotedObject*)(_next & next_mask); | |
39 } | |
40 inline void setNext(PromotedObject* x) { | |
41 assert(((intptr_t)x & ~next_mask) == 0, | |
42 "Conflict in bit usage, " | |
43 " or insufficient alignment of objects"); | |
44 _next |= (intptr_t)x; | |
45 } | |
46 inline void setPromotedMark() { | |
47 _next |= promoted_mask; | |
48 } | |
49 inline bool hasPromotedMark() const { | |
50 return (_next & promoted_mask) == promoted_mask; | |
51 } | |
52 inline void setDisplacedMark() { | |
53 _next |= displaced_mark; | |
54 } | |
55 inline bool hasDisplacedMark() const { | |
56 return (_next & displaced_mark) != 0; | |
57 } | |
58 inline void clearNext() { _next = 0; } | |
59 debug_only(void *next_addr() { return (void *) &_next; }) | |
60 }; | |
61 | |
62 class SpoolBlock: public FreeChunk { | |
63 friend class PromotionInfo; | |
64 protected: | |
65 SpoolBlock* nextSpoolBlock; | |
66 size_t bufferSize; // number of usable words in this block | |
67 markOop* displacedHdr; // the displaced headers start here | |
68 | |
69 // Note about bufferSize: it denotes the number of entries available plus 1; | |
70 // legal indices range from 1 through BufferSize - 1. See the verification | |
71 // code verify() that counts the number of displaced headers spooled. | |
72 size_t computeBufferSize() { | |
73 return (size() * sizeof(HeapWord) - sizeof(*this)) / sizeof(markOop); | |
74 } | |
75 | |
76 public: | |
77 void init() { | |
78 bufferSize = computeBufferSize(); | |
79 displacedHdr = (markOop*)&displacedHdr; | |
80 nextSpoolBlock = NULL; | |
81 } | |
82 | |
83 void print_on(outputStream* st) const; | |
84 void print() const { print_on(gclog_or_tty); } | |
85 }; | |
86 | |
87 class PromotionInfo VALUE_OBJ_CLASS_SPEC { | |
88 bool _tracking; // set if tracking | |
89 CompactibleFreeListSpace* _space; // the space to which this belongs | |
90 PromotedObject* _promoHead; // head of list of promoted objects | |
91 PromotedObject* _promoTail; // tail of list of promoted objects | |
92 SpoolBlock* _spoolHead; // first spooling block | |
93 SpoolBlock* _spoolTail; // last non-full spooling block or null | |
94 SpoolBlock* _splice_point; // when _spoolTail is null, holds list tail | |
95 SpoolBlock* _spareSpool; // free spool buffer | |
96 size_t _firstIndex; // first active index in | |
97 // first spooling block (_spoolHead) | |
98 size_t _nextIndex; // last active index + 1 in last | |
99 // spooling block (_spoolTail) | |
100 private: | |
101 // ensure that spooling space exists; return true if there is spooling space | |
102 bool ensure_spooling_space_work(); | |
103 | |
104 public: | |
105 PromotionInfo() : | |
106 _tracking(0), _space(NULL), | |
107 _promoHead(NULL), _promoTail(NULL), | |
108 _spoolHead(NULL), _spoolTail(NULL), | |
109 _spareSpool(NULL), _firstIndex(1), | |
110 _nextIndex(1) {} | |
111 | |
112 bool noPromotions() const { | |
113 assert(_promoHead != NULL || _promoTail == NULL, "list inconsistency"); | |
114 return _promoHead == NULL; | |
115 } | |
116 void startTrackingPromotions(); | |
117 void stopTrackingPromotions(uint worker_id = 0); | |
118 bool tracking() const { return _tracking; } | |
119 void track(PromotedObject* trackOop); // keep track of a promoted oop | |
120 // The following variant must be used when trackOop is not fully | |
121 // initialized and has a NULL klass: | |
122 void track(PromotedObject* trackOop, klassOop klassOfOop); // keep track of a promoted oop | |
123 void setSpace(CompactibleFreeListSpace* sp) { _space = sp; } | |
124 CompactibleFreeListSpace* space() const { return _space; } | |
125 markOop nextDisplacedHeader(); // get next header & forward spool pointer | |
126 void saveDisplacedHeader(markOop hdr); | |
127 // save header and forward spool | |
128 | |
129 inline size_t refillSize() const; | |
130 | |
131 SpoolBlock* getSpoolBlock(); // return a free spooling block | |
132 inline bool has_spooling_space() { | |
133 return _spoolTail != NULL && _spoolTail->bufferSize > _nextIndex; | |
134 } | |
135 // ensure that spooling space exists | |
136 bool ensure_spooling_space() { | |
137 return has_spooling_space() || ensure_spooling_space_work(); | |
138 } | |
139 #define PROMOTED_OOPS_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
140 void promoted_oops_iterate##nv_suffix(OopClosureType* cl); | |
141 ALL_SINCE_SAVE_MARKS_CLOSURES(PROMOTED_OOPS_ITERATE_DECL) | |
142 #undef PROMOTED_OOPS_ITERATE_DECL | |
143 void promoted_oops_iterate(OopsInGenClosure* cl) { | |
144 promoted_oops_iterate_v(cl); | |
145 } | |
146 void verify() const; | |
147 void reset() { | |
148 _promoHead = NULL; | |
149 _promoTail = NULL; | |
150 _spoolHead = NULL; | |
151 _spoolTail = NULL; | |
152 _spareSpool = NULL; | |
153 _firstIndex = 0; | |
154 _nextIndex = 0; | |
155 | |
156 } | |
157 | |
158 void print_on(outputStream* st) const; | |
159 void print_statistics(uint worker_id) const; | |
160 }; | |
161 |