Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1BlockOffsetTable.hpp @ 20652:e8bf410d5e23
8058209: Race in G1 card scanning could allow scanning of memory covered by PLABs
Summary: Read _top before _gc_time_stamp in saved_mark_word() with LoadLoad order to ensure we get a consistent view
Reviewed-by: brutisso, dcubed, dholmes, stefank
| author | mgerdin |
|---|---|
| date | Fri, 14 Nov 2014 14:23:25 +0100 |
| parents | e7d0505c8a30 |
| children |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_HPP | |
| 27 | |
| 20337 | 28 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp" |
| 1972 | 29 #include "memory/memRegion.hpp" |
| 30 #include "runtime/virtualspace.hpp" | |
| 31 #include "utilities/globalDefinitions.hpp" | |
| 32 | |
| 342 | 33 // The CollectedHeap type requires subtypes to implement a method |
| 34 // "block_start". For some subtypes, notably generational | |
| 35 // systems using card-table-based write barriers, the efficiency of this | |
| 36 // operation may be important. Implementations of the "BlockOffsetArray" | |
| 37 // class may be useful in providing such efficient implementations. | |
| 38 // | |
| 39 // While generally mirroring the structure of the BOT for GenCollectedHeap, | |
| 40 // the following types are tailored more towards G1's uses; these should, | |
| 41 // however, be merged back into a common BOT to avoid code duplication | |
| 42 // and reduce maintenance overhead. | |
| 43 // | |
| 44 // G1BlockOffsetTable (abstract) | |
| 45 // -- G1BlockOffsetArray (uses G1BlockOffsetSharedArray) | |
| 46 // -- G1BlockOffsetArrayContigSpace | |
| 47 // | |
| 48 // A main impediment to the consolidation of this code might be the | |
| 49 // effect of making some of the block_start*() calls non-const as | |
| 50 // below. Whether that might adversely affect performance optimizations | |
| 51 // that compilers might normally perform in the case of non-G1 | |
| 52 // collectors needs to be carefully investigated prior to any such | |
| 53 // consolidation. | |
| 54 | |
| 55 // Forward declarations | |
| 56 class G1BlockOffsetSharedArray; | |
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57 class G1OffsetTableContigSpace; |
| 342 | 58 |
| 59 class G1BlockOffsetTable VALUE_OBJ_CLASS_SPEC { | |
| 60 friend class VMStructs; | |
| 61 protected: | |
| 62 // These members describe the region covered by the table. | |
| 63 | |
| 64 // The space this table is covering. | |
| 65 HeapWord* _bottom; // == reserved.start | |
| 66 HeapWord* _end; // End of currently allocated region. | |
| 67 | |
| 68 public: | |
| 69 // Initialize the table to cover the given space. | |
| 70 // The contents of the initial table are undefined. | |
| 71 G1BlockOffsetTable(HeapWord* bottom, HeapWord* end) : | |
| 72 _bottom(bottom), _end(end) | |
| 73 { | |
| 74 assert(_bottom <= _end, "arguments out of order"); | |
| 75 } | |
| 76 | |
| 77 // Note that the committed size of the covered space may have changed, | |
| 78 // so the table size might also wish to change. | |
| 79 virtual void resize(size_t new_word_size) = 0; | |
| 80 | |
| 81 virtual void set_bottom(HeapWord* new_bottom) { | |
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82 assert(new_bottom <= _end, |
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83 err_msg("new_bottom (" PTR_FORMAT ") > _end (" PTR_FORMAT ")", |
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84 p2i(new_bottom), p2i(_end))); |
| 342 | 85 _bottom = new_bottom; |
| 86 resize(pointer_delta(_end, _bottom)); | |
| 87 } | |
| 88 | |
| 89 // Requires "addr" to be contained by a block, and returns the address of | |
| 90 // the start of that block. (May have side effects, namely updating of | |
| 91 // shared array entries that "point" too far backwards. This can occur, | |
| 92 // for example, when LAB allocation is used in a space covered by the | |
| 93 // table.) | |
| 94 virtual HeapWord* block_start_unsafe(const void* addr) = 0; | |
| 95 // Same as above, but does not have any of the possible side effects | |
| 96 // discussed above. | |
| 97 virtual HeapWord* block_start_unsafe_const(const void* addr) const = 0; | |
| 98 | |
| 99 // Returns the address of the start of the block containing "addr", or | |
| 100 // else "null" if it is covered by no block. (May have side effects, | |
| 101 // namely updating of shared array entries that "point" too far | |
| 102 // backwards. This can occur, for example, when lab allocation is used | |
| 103 // in a space covered by the table.) | |
| 104 inline HeapWord* block_start(const void* addr); | |
| 105 // Same as above, but does not have any of the possible side effects | |
| 106 // discussed above. | |
| 107 inline HeapWord* block_start_const(const void* addr) const; | |
| 108 }; | |
| 109 | |
| 20337 | 110 class G1BlockOffsetSharedArrayMappingChangedListener : public G1MappingChangedListener { |
| 111 public: | |
| 20543 | 112 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled) { |
| 20542 | 113 // Nothing to do. The BOT is hard-wired to be part of the HeapRegion, and we cannot |
| 114 // retrieve it here since this would cause firing of several asserts. The code | |
| 115 // executed after commit of a region already needs to do some re-initialization of | |
| 116 // the HeapRegion, so we combine that. | |
| 117 } | |
| 20337 | 118 }; |
| 119 | |
| 342 | 120 // This implementation of "G1BlockOffsetTable" divides the covered region |
| 121 // into "N"-word subregions (where "N" = 2^"LogN". An array with an entry | |
| 122 // for each such subregion indicates how far back one must go to find the | |
| 123 // start of the chunk that includes the first word of the subregion. | |
| 124 // | |
| 125 // Each BlockOffsetArray is owned by a Space. However, the actual array | |
| 126 // may be shared by several BlockOffsetArrays; this is useful | |
| 127 // when a single resizable area (such as a generation) is divided up into | |
| 128 // several spaces in which contiguous allocation takes place, | |
| 129 // such as, for example, in G1 or in the train generation.) | |
| 130 | |
| 131 // Here is the shared array type. | |
| 132 | |
| 6197 | 133 class G1BlockOffsetSharedArray: public CHeapObj<mtGC> { |
| 342 | 134 friend class G1BlockOffsetArray; |
| 135 friend class G1BlockOffsetArrayContigSpace; | |
| 136 friend class VMStructs; | |
| 137 | |
| 138 private: | |
| 20337 | 139 G1BlockOffsetSharedArrayMappingChangedListener _listener; |
| 342 | 140 // The reserved region covered by the shared array. |
| 141 MemRegion _reserved; | |
| 142 | |
| 143 // End of the current committed region. | |
| 144 HeapWord* _end; | |
| 145 | |
| 146 // Array for keeping offsets for retrieving object start fast given an | |
| 147 // address. | |
| 148 u_char* _offset_array; // byte array keeping backwards offsets | |
| 149 | |
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150 void check_offset(size_t offset, const char* msg) const { |
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151 assert(offset <= N_words, |
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152 err_msg("%s - " |
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153 "offset: " SIZE_FORMAT ", N_words: " UINT32_FORMAT, |
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154 msg, offset, N_words)); |
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155 } |
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156 |
| 342 | 157 // Bounds checking accessors: |
| 158 // For performance these have to devolve to array accesses in product builds. | |
| 20337 | 159 inline u_char offset_array(size_t index) const; |
| 342 | 160 |
| 20337 | 161 void set_offset_array_raw(size_t index, u_char offset) { |
| 342 | 162 _offset_array[index] = offset; |
| 163 } | |
| 164 | |
| 20337 | 165 inline void set_offset_array(size_t index, u_char offset); |
| 166 | |
| 167 inline void set_offset_array(size_t index, HeapWord* high, HeapWord* low); | |
| 342 | 168 |
| 20337 | 169 inline void set_offset_array(size_t left, size_t right, u_char offset); |
| 342 | 170 |
| 171 bool is_card_boundary(HeapWord* p) const; | |
| 172 | |
| 20337 | 173 public: |
| 174 | |
| 342 | 175 // Return the number of slots needed for an offset array |
| 176 // that covers mem_region_words words. | |
| 20337 | 177 static size_t compute_size(size_t mem_region_words) { |
| 178 size_t number_of_slots = (mem_region_words / N_words); | |
| 179 return ReservedSpace::allocation_align_size_up(number_of_slots); | |
| 342 | 180 } |
| 181 | |
| 182 enum SomePublicConstants { | |
| 183 LogN = 9, | |
| 184 LogN_words = LogN - LogHeapWordSize, | |
| 185 N_bytes = 1 << LogN, | |
| 186 N_words = 1 << LogN_words | |
| 187 }; | |
| 188 | |
| 189 // Initialize the table to cover from "base" to (at least) | |
| 190 // "base + init_word_size". In the future, the table may be expanded | |
| 191 // (see "resize" below) up to the size of "_reserved" (which must be at | |
| 192 // least "init_word_size".) The contents of the initial table are | |
| 193 // undefined; it is the responsibility of the constituent | |
| 194 // G1BlockOffsetTable(s) to initialize cards. | |
| 20337 | 195 G1BlockOffsetSharedArray(MemRegion heap, G1RegionToSpaceMapper* storage); |
| 342 | 196 |
| 197 // Return the appropriate index into "_offset_array" for "p". | |
| 198 inline size_t index_for(const void* p) const; | |
| 20337 | 199 inline size_t index_for_raw(const void* p) const; |
| 342 | 200 |
| 201 // Return the address indicating the start of the region corresponding to | |
| 202 // "index" in "_offset_array". | |
| 203 inline HeapWord* address_for_index(size_t index) const; | |
| 20337 | 204 // Variant of address_for_index that does not check the index for validity. |
| 205 inline HeapWord* address_for_index_raw(size_t index) const { | |
| 206 return _reserved.start() + (index << LogN_words); | |
| 207 } | |
| 342 | 208 }; |
| 209 | |
| 210 // And here is the G1BlockOffsetTable subtype that uses the array. | |
| 211 | |
| 212 class G1BlockOffsetArray: public G1BlockOffsetTable { | |
| 213 friend class G1BlockOffsetSharedArray; | |
| 214 friend class G1BlockOffsetArrayContigSpace; | |
| 215 friend class VMStructs; | |
| 216 private: | |
| 217 enum SomePrivateConstants { | |
| 218 N_words = G1BlockOffsetSharedArray::N_words, | |
| 219 LogN = G1BlockOffsetSharedArray::LogN | |
| 220 }; | |
| 221 | |
| 222 // This is the array, which can be shared by several BlockOffsetArray's | |
| 223 // servicing different | |
| 224 G1BlockOffsetSharedArray* _array; | |
| 225 | |
| 226 // The space that owns this subregion. | |
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227 G1OffsetTableContigSpace* _gsp; |
| 342 | 228 |
| 229 // The portion [_unallocated_block, _sp.end()) of the space that | |
| 230 // is a single block known not to contain any objects. | |
| 231 // NOTE: See BlockOffsetArrayUseUnallocatedBlock flag. | |
| 232 HeapWord* _unallocated_block; | |
| 233 | |
| 234 // Sets the entries | |
| 235 // corresponding to the cards starting at "start" and ending at "end" | |
| 236 // to point back to the card before "start": the interval [start, end) | |
| 237 // is right-open. | |
| 238 void set_remainder_to_point_to_start(HeapWord* start, HeapWord* end); | |
| 239 // Same as above, except that the args here are a card _index_ interval | |
| 240 // that is closed: [start_index, end_index] | |
| 241 void set_remainder_to_point_to_start_incl(size_t start, size_t end); | |
| 242 | |
| 243 protected: | |
| 244 | |
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245 G1OffsetTableContigSpace* gsp() const { return _gsp; } |
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246 |
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247 inline size_t block_size(const HeapWord* p) const; |
| 342 | 248 |
| 249 // Returns the address of a block whose start is at most "addr". | |
| 250 // If "has_max_index" is true, "assumes "max_index" is the last valid one | |
| 251 // in the array. | |
| 252 inline HeapWord* block_at_or_preceding(const void* addr, | |
| 253 bool has_max_index, | |
| 254 size_t max_index) const; | |
| 255 | |
| 256 // "q" is a block boundary that is <= "addr"; "n" is the address of the | |
| 257 // next block (or the end of the space.) Return the address of the | |
| 258 // beginning of the block that contains "addr". Does so without side | |
| 259 // effects (see, e.g., spec of block_start.) | |
| 260 inline HeapWord* | |
| 261 forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n, | |
| 262 const void* addr) const; | |
| 263 | |
| 264 // "q" is a block boundary that is <= "addr"; return the address of the | |
| 265 // beginning of the block that contains "addr". May have side effects | |
| 266 // on "this", by updating imprecise entries. | |
| 267 inline HeapWord* forward_to_block_containing_addr(HeapWord* q, | |
| 268 const void* addr); | |
| 269 | |
| 270 // "q" is a block boundary that is <= "addr"; "n" is the address of the | |
| 271 // next block (or the end of the space.) Return the address of the | |
| 272 // beginning of the block that contains "addr". May have side effects | |
| 273 // on "this", by updating imprecise entries. | |
| 274 HeapWord* forward_to_block_containing_addr_slow(HeapWord* q, | |
| 275 HeapWord* n, | |
| 276 const void* addr); | |
| 277 | |
| 278 // Requires that "*threshold_" be the first array entry boundary at or | |
| 279 // above "blk_start", and that "*index_" be the corresponding array | |
| 280 // index. If the block starts at or crosses "*threshold_", records | |
| 281 // "blk_start" as the appropriate block start for the array index | |
| 282 // starting at "*threshold_", and for any other indices crossed by the | |
| 283 // block. Updates "*threshold_" and "*index_" to correspond to the first | |
| 284 // index after the block end. | |
| 285 void alloc_block_work2(HeapWord** threshold_, size_t* index_, | |
| 286 HeapWord* blk_start, HeapWord* blk_end); | |
| 287 | |
| 288 public: | |
| 289 // The space may not have it's bottom and top set yet, which is why the | |
| 20542 | 290 // region is passed as a parameter. The elements of the array are |
| 291 // initialized to zero. | |
| 292 G1BlockOffsetArray(G1BlockOffsetSharedArray* array, MemRegion mr); | |
| 342 | 293 |
| 294 // Note: this ought to be part of the constructor, but that would require | |
| 295 // "this" to be passed as a parameter to a member constructor for | |
| 296 // the containing concrete subtype of Space. | |
| 297 // This would be legal C++, but MS VC++ doesn't allow it. | |
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298 void set_space(G1OffsetTableContigSpace* sp); |
| 342 | 299 |
| 300 // Resets the covered region to one with the same _bottom as before but | |
| 301 // the "new_word_size". | |
| 302 void resize(size_t new_word_size); | |
| 303 | |
| 304 virtual HeapWord* block_start_unsafe(const void* addr); | |
| 305 virtual HeapWord* block_start_unsafe_const(const void* addr) const; | |
| 306 | |
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307 // Used by region verification. Checks that the contents of the |
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308 // BOT reflect that there's a single object that spans the address |
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309 // range [obj_start, obj_start + word_size); returns true if this is |
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310 // the case, returns false if it's not. |
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311 bool verify_for_object(HeapWord* obj_start, size_t word_size) const; |
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312 |
| 342 | 313 void check_all_cards(size_t left_card, size_t right_card) const; |
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314 |
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315 virtual void print_on(outputStream* out) PRODUCT_RETURN; |
| 342 | 316 }; |
| 317 | |
| 318 // A subtype of BlockOffsetArray that takes advantage of the fact | |
| 319 // that its underlying space is a ContiguousSpace, so that its "active" | |
| 320 // region can be more efficiently tracked (than for a non-contiguous space). | |
| 321 class G1BlockOffsetArrayContigSpace: public G1BlockOffsetArray { | |
| 322 friend class VMStructs; | |
| 323 | |
| 324 // allocation boundary at which offset array must be updated | |
| 325 HeapWord* _next_offset_threshold; | |
| 326 size_t _next_offset_index; // index corresponding to that boundary | |
| 327 | |
| 328 // Work function to be called when allocation start crosses the next | |
| 329 // threshold in the contig space. | |
| 330 void alloc_block_work1(HeapWord* blk_start, HeapWord* blk_end) { | |
| 331 alloc_block_work2(&_next_offset_threshold, &_next_offset_index, | |
| 332 blk_start, blk_end); | |
| 333 } | |
| 334 | |
| 20542 | 335 // Zero out the entry for _bottom (offset will be zero). Does not check for availability of the |
| 20337 | 336 // memory first. |
| 337 void zero_bottom_entry_raw(); | |
| 338 // Variant of initialize_threshold that does not check for availability of the | |
| 339 // memory first. | |
| 340 HeapWord* initialize_threshold_raw(); | |
| 342 | 341 public: |
| 342 G1BlockOffsetArrayContigSpace(G1BlockOffsetSharedArray* array, MemRegion mr); | |
| 343 | |
| 344 // Initialize the threshold to reflect the first boundary after the | |
| 345 // bottom of the covered region. | |
| 346 HeapWord* initialize_threshold(); | |
| 347 | |
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348 void reset_bot() { |
| 20337 | 349 zero_bottom_entry_raw(); |
| 350 initialize_threshold_raw(); | |
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351 } |
| 342 | 352 |
| 353 // Return the next threshold, the point at which the table should be | |
| 354 // updated. | |
| 355 HeapWord* threshold() const { return _next_offset_threshold; } | |
| 356 | |
| 357 // These must be guaranteed to work properly (i.e., do nothing) | |
| 358 // when "blk_start" ("blk" for second version) is "NULL". In this | |
| 359 // implementation, that's true because NULL is represented as 0, and thus | |
| 360 // never exceeds the "_next_offset_threshold". | |
| 361 void alloc_block(HeapWord* blk_start, HeapWord* blk_end) { | |
| 362 if (blk_end > _next_offset_threshold) | |
| 363 alloc_block_work1(blk_start, blk_end); | |
| 364 } | |
| 365 void alloc_block(HeapWord* blk, size_t size) { | |
| 366 alloc_block(blk, blk+size); | |
| 367 } | |
| 368 | |
| 369 HeapWord* block_start_unsafe(const void* addr); | |
| 370 HeapWord* block_start_unsafe_const(const void* addr) const; | |
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371 |
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372 void set_for_starts_humongous(HeapWord* new_top); |
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373 |
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374 virtual void print_on(outputStream* out) PRODUCT_RETURN; |
| 342 | 375 }; |
| 1972 | 376 |
| 377 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_HPP |