Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/promotionInfo.hpp @ 1903:87d6a4d1ecbc
6990192: VM crashes in ciTypeFlow::get_block_for()
Reviewed-by: never
author | twisti |
---|---|
date | Tue, 19 Oct 2010 02:52:57 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
---|---|
1521 | 1 /* |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1546
diff
changeset
|
2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. |
1521 | 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1546
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1546
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1546
diff
changeset
|
21 * questions. |
1521 | 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 }; | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
35 |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
36 // Below, we want _narrow_next in the "higher" 32 bit slot, |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
37 // whose position will depend on endian-ness of the platform. |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
38 // This is so that there is no interference with the |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
39 // cms_free_bit occupying bit position 7 (lsb == 0) |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
40 // when we are using compressed oops; see FreeChunk::isFree(). |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
41 // We cannot move the cms_free_bit down because currently |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
42 // biased locking code assumes that age bits are contiguous |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
43 // with the lock bits. Even if that assumption were relaxed, |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
44 // the least position we could move this bit to would be |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
45 // to bit position 3, which would require 16 byte alignment. |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
46 typedef struct { |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
47 #ifdef VM_LITTLE_ENDIAN |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
48 LP64_ONLY(narrowOop _pad;) |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
49 narrowOop _narrow_next; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
50 #else |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
51 narrowOop _narrow_next; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
52 LP64_ONLY(narrowOop _pad;) |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
53 #endif |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
54 } Data; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
55 |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
56 union { |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
57 intptr_t _next; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
58 Data _data; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
59 }; |
1521 | 60 public: |
61 inline PromotedObject* next() const { | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
62 assert(!((FreeChunk*)this)->isFree(), "Error"); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
63 PromotedObject* res; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
64 if (UseCompressedOops) { |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
65 // The next pointer is a compressed oop stored in the top 32 bits |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
66 res = (PromotedObject*)oopDesc::decode_heap_oop(_data._narrow_next); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
67 } else { |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
68 res = (PromotedObject*)(_next & next_mask); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
69 } |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
70 assert(oop(res)->is_oop_or_null(true /* ignore mark word */), "Not an oop?"); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
71 return res; |
1521 | 72 } |
73 inline void setNext(PromotedObject* x) { | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
74 assert(((intptr_t)x & ~next_mask) == 0, "Conflict in bit usage, " |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
75 "or insufficient alignment of objects"); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
76 if (UseCompressedOops) { |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
77 assert(_data._narrow_next == 0, "Overwrite?"); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
78 _data._narrow_next = oopDesc::encode_heap_oop(oop(x)); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
79 } else { |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
80 _next |= (intptr_t)x; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
81 } |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
82 assert(!((FreeChunk*)this)->isFree(), "Error"); |
1521 | 83 } |
84 inline void setPromotedMark() { | |
85 _next |= promoted_mask; | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
86 assert(!((FreeChunk*)this)->isFree(), "Error"); |
1521 | 87 } |
88 inline bool hasPromotedMark() const { | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
89 assert(!((FreeChunk*)this)->isFree(), "Error"); |
1521 | 90 return (_next & promoted_mask) == promoted_mask; |
91 } | |
92 inline void setDisplacedMark() { | |
93 _next |= displaced_mark; | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
94 assert(!((FreeChunk*)this)->isFree(), "Error"); |
1521 | 95 } |
96 inline bool hasDisplacedMark() const { | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
97 assert(!((FreeChunk*)this)->isFree(), "Error"); |
1521 | 98 return (_next & displaced_mark) != 0; |
99 } | |
1546
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
100 inline void clearNext() { |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
101 _next = 0; |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
102 assert(!((FreeChunk*)this)->isFree(), "Error"); |
a00b51b2dda4
6948539: CMS+UseCompressedOops: placement of cms_free bit interferes with promoted object link
ysr
parents:
1521
diff
changeset
|
103 } |
1521 | 104 debug_only(void *next_addr() { return (void *) &_next; }) |
105 }; | |
106 | |
107 class SpoolBlock: public FreeChunk { | |
108 friend class PromotionInfo; | |
109 protected: | |
110 SpoolBlock* nextSpoolBlock; | |
111 size_t bufferSize; // number of usable words in this block | |
112 markOop* displacedHdr; // the displaced headers start here | |
113 | |
114 // Note about bufferSize: it denotes the number of entries available plus 1; | |
115 // legal indices range from 1 through BufferSize - 1. See the verification | |
116 // code verify() that counts the number of displaced headers spooled. | |
117 size_t computeBufferSize() { | |
118 return (size() * sizeof(HeapWord) - sizeof(*this)) / sizeof(markOop); | |
119 } | |
120 | |
121 public: | |
122 void init() { | |
123 bufferSize = computeBufferSize(); | |
124 displacedHdr = (markOop*)&displacedHdr; | |
125 nextSpoolBlock = NULL; | |
126 } | |
127 | |
128 void print_on(outputStream* st) const; | |
129 void print() const { print_on(gclog_or_tty); } | |
130 }; | |
131 | |
132 class PromotionInfo VALUE_OBJ_CLASS_SPEC { | |
133 bool _tracking; // set if tracking | |
134 CompactibleFreeListSpace* _space; // the space to which this belongs | |
135 PromotedObject* _promoHead; // head of list of promoted objects | |
136 PromotedObject* _promoTail; // tail of list of promoted objects | |
137 SpoolBlock* _spoolHead; // first spooling block | |
138 SpoolBlock* _spoolTail; // last non-full spooling block or null | |
139 SpoolBlock* _splice_point; // when _spoolTail is null, holds list tail | |
140 SpoolBlock* _spareSpool; // free spool buffer | |
141 size_t _firstIndex; // first active index in | |
142 // first spooling block (_spoolHead) | |
143 size_t _nextIndex; // last active index + 1 in last | |
144 // spooling block (_spoolTail) | |
145 private: | |
146 // ensure that spooling space exists; return true if there is spooling space | |
147 bool ensure_spooling_space_work(); | |
148 | |
149 public: | |
150 PromotionInfo() : | |
151 _tracking(0), _space(NULL), | |
152 _promoHead(NULL), _promoTail(NULL), | |
153 _spoolHead(NULL), _spoolTail(NULL), | |
154 _spareSpool(NULL), _firstIndex(1), | |
155 _nextIndex(1) {} | |
156 | |
157 bool noPromotions() const { | |
158 assert(_promoHead != NULL || _promoTail == NULL, "list inconsistency"); | |
159 return _promoHead == NULL; | |
160 } | |
161 void startTrackingPromotions(); | |
162 void stopTrackingPromotions(uint worker_id = 0); | |
163 bool tracking() const { return _tracking; } | |
164 void track(PromotedObject* trackOop); // keep track of a promoted oop | |
165 // The following variant must be used when trackOop is not fully | |
166 // initialized and has a NULL klass: | |
167 void track(PromotedObject* trackOop, klassOop klassOfOop); // keep track of a promoted oop | |
168 void setSpace(CompactibleFreeListSpace* sp) { _space = sp; } | |
169 CompactibleFreeListSpace* space() const { return _space; } | |
170 markOop nextDisplacedHeader(); // get next header & forward spool pointer | |
171 void saveDisplacedHeader(markOop hdr); | |
172 // save header and forward spool | |
173 | |
174 inline size_t refillSize() const; | |
175 | |
176 SpoolBlock* getSpoolBlock(); // return a free spooling block | |
177 inline bool has_spooling_space() { | |
178 return _spoolTail != NULL && _spoolTail->bufferSize > _nextIndex; | |
179 } | |
180 // ensure that spooling space exists | |
181 bool ensure_spooling_space() { | |
182 return has_spooling_space() || ensure_spooling_space_work(); | |
183 } | |
184 #define PROMOTED_OOPS_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
185 void promoted_oops_iterate##nv_suffix(OopClosureType* cl); | |
186 ALL_SINCE_SAVE_MARKS_CLOSURES(PROMOTED_OOPS_ITERATE_DECL) | |
187 #undef PROMOTED_OOPS_ITERATE_DECL | |
188 void promoted_oops_iterate(OopsInGenClosure* cl) { | |
189 promoted_oops_iterate_v(cl); | |
190 } | |
191 void verify() const; | |
192 void reset() { | |
193 _promoHead = NULL; | |
194 _promoTail = NULL; | |
195 _spoolHead = NULL; | |
196 _spoolTail = NULL; | |
197 _spareSpool = NULL; | |
198 _firstIndex = 0; | |
199 _nextIndex = 0; | |
200 | |
201 } | |
202 | |
203 void print_on(outputStream* st) const; | |
204 void print_statistics(uint worker_id) const; | |
205 }; | |
206 |