Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/promotionInfo.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | f69a5d43dc19 |
| rev | line source |
|---|---|
| 1521 | 1 /* |
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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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 1521 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_PROMOTIONINFO_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_PROMOTIONINFO_HPP | |
| 27 | |
| 28 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" | |
| 29 #include "memory/allocation.hpp" | |
| 30 | |
| 1521 | 31 // Forward declarations |
| 32 class CompactibleFreeListSpace; | |
| 33 | |
| 34 class PromotedObject VALUE_OBJ_CLASS_SPEC { | |
| 35 private: | |
| 36 enum { | |
| 37 promoted_mask = right_n_bits(2), // i.e. 0x3 | |
| 38 displaced_mark = nth_bit(2), // i.e. 0x4 | |
| 39 next_mask = ~(right_n_bits(3)) // i.e. ~(0x7) | |
| 40 }; | |
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41 |
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42 // Below, we want _narrow_next in the "higher" 32 bit slot, |
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43 // whose position will depend on endian-ness of the platform. |
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44 // This is so that there is no interference with the |
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45 // cms_free_bit occupying bit position 7 (lsb == 0) |
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46 // when we are using compressed oops; see FreeChunk::isFree(). |
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47 // We cannot move the cms_free_bit down because currently |
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48 // biased locking code assumes that age bits are contiguous |
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49 // with the lock bits. Even if that assumption were relaxed, |
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50 // the least position we could move this bit to would be |
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51 // to bit position 3, which would require 16 byte alignment. |
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52 typedef struct { |
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53 #ifdef VM_LITTLE_ENDIAN |
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54 LP64_ONLY(narrowOop _pad;) |
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55 narrowOop _narrow_next; |
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56 #else |
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57 narrowOop _narrow_next; |
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58 LP64_ONLY(narrowOop _pad;) |
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59 #endif |
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60 } Data; |
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61 |
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62 union { |
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63 intptr_t _next; |
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64 Data _data; |
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65 }; |
| 1521 | 66 public: |
| 67 inline PromotedObject* next() const { | |
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68 assert(!((FreeChunk*)this)->isFree(), "Error"); |
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69 PromotedObject* res; |
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70 if (UseCompressedOops) { |
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71 // The next pointer is a compressed oop stored in the top 32 bits |
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72 res = (PromotedObject*)oopDesc::decode_heap_oop(_data._narrow_next); |
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73 } else { |
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74 res = (PromotedObject*)(_next & next_mask); |
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75 } |
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76 assert(oop(res)->is_oop_or_null(true /* ignore mark word */), "Not an oop?"); |
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77 return res; |
| 1521 | 78 } |
| 79 inline void setNext(PromotedObject* x) { | |
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80 assert(((intptr_t)x & ~next_mask) == 0, "Conflict in bit usage, " |
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81 "or insufficient alignment of objects"); |
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82 if (UseCompressedOops) { |
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83 assert(_data._narrow_next == 0, "Overwrite?"); |
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84 _data._narrow_next = oopDesc::encode_heap_oop(oop(x)); |
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85 } else { |
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86 _next |= (intptr_t)x; |
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87 } |
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88 assert(!((FreeChunk*)this)->isFree(), "Error"); |
| 1521 | 89 } |
| 90 inline void setPromotedMark() { | |
| 91 _next |= promoted_mask; | |
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92 assert(!((FreeChunk*)this)->isFree(), "Error"); |
| 1521 | 93 } |
| 94 inline bool hasPromotedMark() const { | |
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95 assert(!((FreeChunk*)this)->isFree(), "Error"); |
| 1521 | 96 return (_next & promoted_mask) == promoted_mask; |
| 97 } | |
| 98 inline void setDisplacedMark() { | |
| 99 _next |= displaced_mark; | |
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100 assert(!((FreeChunk*)this)->isFree(), "Error"); |
| 1521 | 101 } |
| 102 inline bool hasDisplacedMark() const { | |
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103 assert(!((FreeChunk*)this)->isFree(), "Error"); |
| 1521 | 104 return (_next & displaced_mark) != 0; |
| 105 } | |
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106 inline void clearNext() { |
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107 _next = 0; |
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108 assert(!((FreeChunk*)this)->isFree(), "Error"); |
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109 } |
| 1521 | 110 debug_only(void *next_addr() { return (void *) &_next; }) |
| 111 }; | |
| 112 | |
| 113 class SpoolBlock: public FreeChunk { | |
| 114 friend class PromotionInfo; | |
| 115 protected: | |
| 116 SpoolBlock* nextSpoolBlock; | |
| 117 size_t bufferSize; // number of usable words in this block | |
| 118 markOop* displacedHdr; // the displaced headers start here | |
| 119 | |
| 120 // Note about bufferSize: it denotes the number of entries available plus 1; | |
| 121 // legal indices range from 1 through BufferSize - 1. See the verification | |
| 122 // code verify() that counts the number of displaced headers spooled. | |
| 123 size_t computeBufferSize() { | |
| 124 return (size() * sizeof(HeapWord) - sizeof(*this)) / sizeof(markOop); | |
| 125 } | |
| 126 | |
| 127 public: | |
| 128 void init() { | |
| 129 bufferSize = computeBufferSize(); | |
| 130 displacedHdr = (markOop*)&displacedHdr; | |
| 131 nextSpoolBlock = NULL; | |
| 132 } | |
| 133 | |
| 134 void print_on(outputStream* st) const; | |
| 135 void print() const { print_on(gclog_or_tty); } | |
| 136 }; | |
| 137 | |
| 138 class PromotionInfo VALUE_OBJ_CLASS_SPEC { | |
| 139 bool _tracking; // set if tracking | |
| 140 CompactibleFreeListSpace* _space; // the space to which this belongs | |
| 141 PromotedObject* _promoHead; // head of list of promoted objects | |
| 142 PromotedObject* _promoTail; // tail of list of promoted objects | |
| 143 SpoolBlock* _spoolHead; // first spooling block | |
| 144 SpoolBlock* _spoolTail; // last non-full spooling block or null | |
| 145 SpoolBlock* _splice_point; // when _spoolTail is null, holds list tail | |
| 146 SpoolBlock* _spareSpool; // free spool buffer | |
| 147 size_t _firstIndex; // first active index in | |
| 148 // first spooling block (_spoolHead) | |
| 149 size_t _nextIndex; // last active index + 1 in last | |
| 150 // spooling block (_spoolTail) | |
| 151 private: | |
| 152 // ensure that spooling space exists; return true if there is spooling space | |
| 153 bool ensure_spooling_space_work(); | |
| 154 | |
| 155 public: | |
| 156 PromotionInfo() : | |
| 157 _tracking(0), _space(NULL), | |
| 158 _promoHead(NULL), _promoTail(NULL), | |
| 159 _spoolHead(NULL), _spoolTail(NULL), | |
| 160 _spareSpool(NULL), _firstIndex(1), | |
| 161 _nextIndex(1) {} | |
| 162 | |
| 163 bool noPromotions() const { | |
| 164 assert(_promoHead != NULL || _promoTail == NULL, "list inconsistency"); | |
| 165 return _promoHead == NULL; | |
| 166 } | |
| 167 void startTrackingPromotions(); | |
| 168 void stopTrackingPromotions(uint worker_id = 0); | |
| 169 bool tracking() const { return _tracking; } | |
| 170 void track(PromotedObject* trackOop); // keep track of a promoted oop | |
| 171 // The following variant must be used when trackOop is not fully | |
| 172 // initialized and has a NULL klass: | |
| 173 void track(PromotedObject* trackOop, klassOop klassOfOop); // keep track of a promoted oop | |
| 174 void setSpace(CompactibleFreeListSpace* sp) { _space = sp; } | |
| 175 CompactibleFreeListSpace* space() const { return _space; } | |
| 176 markOop nextDisplacedHeader(); // get next header & forward spool pointer | |
| 177 void saveDisplacedHeader(markOop hdr); | |
| 178 // save header and forward spool | |
| 179 | |
| 180 inline size_t refillSize() const; | |
| 181 | |
| 182 SpoolBlock* getSpoolBlock(); // return a free spooling block | |
| 183 inline bool has_spooling_space() { | |
| 184 return _spoolTail != NULL && _spoolTail->bufferSize > _nextIndex; | |
| 185 } | |
| 186 // ensure that spooling space exists | |
| 187 bool ensure_spooling_space() { | |
| 188 return has_spooling_space() || ensure_spooling_space_work(); | |
| 189 } | |
| 190 #define PROMOTED_OOPS_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
| 191 void promoted_oops_iterate##nv_suffix(OopClosureType* cl); | |
| 192 ALL_SINCE_SAVE_MARKS_CLOSURES(PROMOTED_OOPS_ITERATE_DECL) | |
| 193 #undef PROMOTED_OOPS_ITERATE_DECL | |
| 194 void promoted_oops_iterate(OopsInGenClosure* cl) { | |
| 195 promoted_oops_iterate_v(cl); | |
| 196 } | |
| 197 void verify() const; | |
| 198 void reset() { | |
| 199 _promoHead = NULL; | |
| 200 _promoTail = NULL; | |
| 201 _spoolHead = NULL; | |
| 202 _spoolTail = NULL; | |
| 203 _spareSpool = NULL; | |
| 204 _firstIndex = 0; | |
| 205 _nextIndex = 0; | |
| 206 | |
| 207 } | |
| 208 | |
| 209 void print_on(outputStream* st) const; | |
| 210 void print_statistics(uint worker_id) const; | |
| 211 }; | |
| 212 | |
| 1972 | 213 |
| 214 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_PROMOTIONINFO_HPP |