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annotate src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.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 | c760f78e0a53 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP | |
| 27 | |
| 28 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" | |
| 29 #include "utilities/bitMap.inline.hpp" | |
| 30 | |
| 0 | 31 class oopDesc; |
| 32 class ParMarkBitMapClosure; | |
| 33 | |
| 34 class ParMarkBitMap: public CHeapObj | |
| 35 { | |
| 36 public: | |
| 37 typedef BitMap::idx_t idx_t; | |
| 38 | |
| 39 // Values returned by the iterate() methods. | |
| 40 enum IterationStatus { incomplete, complete, full, would_overflow }; | |
| 41 | |
| 42 inline ParMarkBitMap(); | |
| 43 inline ParMarkBitMap(MemRegion covered_region); | |
| 44 bool initialize(MemRegion covered_region); | |
| 45 | |
| 46 // Atomically mark an object as live. | |
| 47 bool mark_obj(HeapWord* addr, size_t size); | |
| 48 inline bool mark_obj(oop obj, int size); | |
| 49 inline bool mark_obj(oop obj); | |
| 50 | |
| 51 // Return whether the specified begin or end bit is set. | |
| 52 inline bool is_obj_beg(idx_t bit) const; | |
| 53 inline bool is_obj_end(idx_t bit) const; | |
| 54 | |
| 55 // Traditional interface for testing whether an object is marked or not (these | |
| 56 // test only the begin bits). | |
| 57 inline bool is_marked(idx_t bit) const; | |
| 58 inline bool is_marked(HeapWord* addr) const; | |
| 59 inline bool is_marked(oop obj) const; | |
| 60 | |
| 61 inline bool is_unmarked(idx_t bit) const; | |
| 62 inline bool is_unmarked(HeapWord* addr) const; | |
| 63 inline bool is_unmarked(oop obj) const; | |
| 64 | |
| 65 // Convert sizes from bits to HeapWords and back. An object that is n bits | |
| 66 // long will be bits_to_words(n) words long. An object that is m words long | |
| 67 // will take up words_to_bits(m) bits in the bitmap. | |
| 68 inline static size_t bits_to_words(idx_t bits); | |
| 69 inline static idx_t words_to_bits(size_t words); | |
| 70 | |
| 71 // Return the size in words of an object given a begin bit and an end bit, or | |
| 72 // the equivalent beg_addr and end_addr. | |
| 73 inline size_t obj_size(idx_t beg_bit, idx_t end_bit) const; | |
| 74 inline size_t obj_size(HeapWord* beg_addr, HeapWord* end_addr) const; | |
| 75 | |
| 76 // Return the size in words of the object (a search is done for the end bit). | |
| 77 inline size_t obj_size(idx_t beg_bit) const; | |
| 78 inline size_t obj_size(HeapWord* addr) const; | |
| 79 inline size_t obj_size(oop obj) const; | |
| 80 | |
| 81 // Synonyms for the above. | |
| 82 size_t obj_size_in_words(oop obj) const { return obj_size((HeapWord*)obj); } | |
| 83 size_t obj_size_in_words(HeapWord* addr) const { return obj_size(addr); } | |
| 84 | |
| 85 // Apply live_closure to each live object that lies completely within the | |
| 86 // range [live_range_beg, live_range_end). This is used to iterate over the | |
| 87 // compacted region of the heap. Return values: | |
| 88 // | |
| 89 // incomplete The iteration is not complete. The last object that | |
| 90 // begins in the range does not end in the range; | |
| 91 // closure->source() is set to the start of that object. | |
| 92 // | |
| 93 // complete The iteration is complete. All objects in the range | |
| 94 // were processed and the closure is not full; | |
| 95 // closure->source() is set one past the end of the range. | |
| 96 // | |
| 97 // full The closure is full; closure->source() is set to one | |
| 98 // past the end of the last object processed. | |
| 99 // | |
| 100 // would_overflow The next object in the range would overflow the closure; | |
| 101 // closure->source() is set to the start of that object. | |
| 102 IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
| 103 idx_t range_beg, idx_t range_end) const; | |
| 104 inline IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
| 105 HeapWord* range_beg, | |
| 106 HeapWord* range_end) const; | |
| 107 | |
| 108 // Apply live closure as above and additionally apply dead_closure to all dead | |
| 109 // space in the range [range_beg, dead_range_end). Note that dead_range_end | |
| 110 // must be >= range_end. This is used to iterate over the dense prefix. | |
| 111 // | |
| 112 // This method assumes that if the first bit in the range (range_beg) is not | |
| 113 // marked, then dead space begins at that point and the dead_closure is | |
| 114 // applied. Thus callers must ensure that range_beg is not in the middle of a | |
| 115 // live object. | |
| 116 IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
| 117 ParMarkBitMapClosure* dead_closure, | |
| 118 idx_t range_beg, idx_t range_end, | |
| 119 idx_t dead_range_end) const; | |
| 120 inline IterationStatus iterate(ParMarkBitMapClosure* live_closure, | |
| 121 ParMarkBitMapClosure* dead_closure, | |
| 122 HeapWord* range_beg, | |
| 123 HeapWord* range_end, | |
| 124 HeapWord* dead_range_end) const; | |
| 125 | |
| 126 // Return the number of live words in the range [beg_addr, end_addr) due to | |
| 127 // objects that start in the range. If a live object extends onto the range, | |
| 128 // the caller must detect and account for any live words due to that object. | |
| 129 // If a live object extends beyond the end of the range, only the words within | |
| 130 // the range are included in the result. | |
| 131 size_t live_words_in_range(HeapWord* beg_addr, HeapWord* end_addr) const; | |
| 132 | |
| 133 // Same as the above, except the end of the range must be a live object, which | |
| 134 // is the case when updating pointers. This allows a branch to be removed | |
| 135 // from inside the loop. | |
| 136 size_t live_words_in_range(HeapWord* beg_addr, oop end_obj) const; | |
| 137 | |
| 138 inline HeapWord* region_start() const; | |
| 139 inline HeapWord* region_end() const; | |
| 140 inline size_t region_size() const; | |
| 141 inline size_t size() const; | |
| 142 | |
| 143 // Convert a heap address to/from a bit index. | |
| 144 inline idx_t addr_to_bit(HeapWord* addr) const; | |
| 145 inline HeapWord* bit_to_addr(idx_t bit) const; | |
| 146 | |
| 147 // Return the bit index of the first marked object that begins (or ends, | |
| 148 // respectively) in the range [beg, end). If no object is found, return end. | |
| 149 inline idx_t find_obj_beg(idx_t beg, idx_t end) const; | |
| 150 inline idx_t find_obj_end(idx_t beg, idx_t end) const; | |
| 151 | |
| 152 inline HeapWord* find_obj_beg(HeapWord* beg, HeapWord* end) const; | |
| 153 inline HeapWord* find_obj_end(HeapWord* beg, HeapWord* end) const; | |
| 154 | |
| 155 // Clear a range of bits or the entire bitmap (both begin and end bits are | |
| 156 // cleared). | |
| 157 inline void clear_range(idx_t beg, idx_t end); | |
| 158 inline void clear() { clear_range(0, size()); } | |
| 159 | |
| 160 // Return the number of bits required to represent the specified number of | |
| 161 // HeapWords, or the specified region. | |
| 162 static inline idx_t bits_required(size_t words); | |
| 163 static inline idx_t bits_required(MemRegion covered_region); | |
| 164 static inline idx_t words_required(MemRegion covered_region); | |
| 165 | |
| 166 #ifndef PRODUCT | |
| 167 // CAS statistics. | |
| 168 size_t cas_tries() { return _cas_tries; } | |
| 169 size_t cas_retries() { return _cas_retries; } | |
| 170 size_t cas_by_another() { return _cas_by_another; } | |
| 171 | |
| 172 void reset_counters(); | |
| 173 #endif // #ifndef PRODUCT | |
| 174 | |
| 175 #ifdef ASSERT | |
| 176 void verify_clear() const; | |
| 177 inline void verify_bit(idx_t bit) const; | |
| 178 inline void verify_addr(HeapWord* addr) const; | |
| 179 #endif // #ifdef ASSERT | |
| 180 | |
| 181 private: | |
| 182 // Each bit in the bitmap represents one unit of 'object granularity.' Objects | |
| 183 // are double-word aligned in 32-bit VMs, but not in 64-bit VMs, so the 32-bit | |
| 184 // granularity is 2, 64-bit is 1. | |
| 185 static inline size_t obj_granularity() { return size_t(MinObjAlignment); } | |
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186 static inline int obj_granularity_shift() { return LogMinObjAlignment; } |
| 0 | 187 |
| 188 HeapWord* _region_start; | |
| 189 size_t _region_size; | |
| 190 BitMap _beg_bits; | |
| 191 BitMap _end_bits; | |
| 192 PSVirtualSpace* _virtual_space; | |
| 193 | |
| 194 #ifndef PRODUCT | |
| 195 size_t _cas_tries; | |
| 196 size_t _cas_retries; | |
| 197 size_t _cas_by_another; | |
| 198 #endif // #ifndef PRODUCT | |
| 199 }; | |
| 200 | |
| 201 inline ParMarkBitMap::ParMarkBitMap(): | |
| 342 | 202 _beg_bits(), |
| 203 _end_bits() | |
| 0 | 204 { |
| 205 _region_start = 0; | |
| 206 _virtual_space = 0; | |
| 207 } | |
| 208 | |
| 209 inline ParMarkBitMap::ParMarkBitMap(MemRegion covered_region): | |
| 342 | 210 _beg_bits(), |
| 211 _end_bits() | |
| 0 | 212 { |
| 213 initialize(covered_region); | |
| 214 } | |
| 215 | |
| 216 inline void ParMarkBitMap::clear_range(idx_t beg, idx_t end) | |
| 217 { | |
| 218 _beg_bits.clear_range(beg, end); | |
| 219 _end_bits.clear_range(beg, end); | |
| 220 } | |
| 221 | |
| 222 inline ParMarkBitMap::idx_t | |
| 223 ParMarkBitMap::bits_required(size_t words) | |
| 224 { | |
| 225 // Need two bits (one begin bit, one end bit) for each unit of 'object | |
| 226 // granularity' in the heap. | |
| 227 return words_to_bits(words * 2); | |
| 228 } | |
| 229 | |
| 230 inline ParMarkBitMap::idx_t | |
| 231 ParMarkBitMap::bits_required(MemRegion covered_region) | |
| 232 { | |
| 233 return bits_required(covered_region.word_size()); | |
| 234 } | |
| 235 | |
| 236 inline ParMarkBitMap::idx_t | |
| 237 ParMarkBitMap::words_required(MemRegion covered_region) | |
| 238 { | |
| 239 return bits_required(covered_region) / BitsPerWord; | |
| 240 } | |
| 241 | |
| 242 inline HeapWord* | |
| 243 ParMarkBitMap::region_start() const | |
| 244 { | |
| 245 return _region_start; | |
| 246 } | |
| 247 | |
| 248 inline HeapWord* | |
| 249 ParMarkBitMap::region_end() const | |
| 250 { | |
| 251 return region_start() + region_size(); | |
| 252 } | |
| 253 | |
| 254 inline size_t | |
| 255 ParMarkBitMap::region_size() const | |
| 256 { | |
| 257 return _region_size; | |
| 258 } | |
| 259 | |
| 260 inline size_t | |
| 261 ParMarkBitMap::size() const | |
| 262 { | |
| 263 return _beg_bits.size(); | |
| 264 } | |
| 265 | |
| 266 inline bool ParMarkBitMap::is_obj_beg(idx_t bit) const | |
| 267 { | |
| 268 return _beg_bits.at(bit); | |
| 269 } | |
| 270 | |
| 271 inline bool ParMarkBitMap::is_obj_end(idx_t bit) const | |
| 272 { | |
| 273 return _end_bits.at(bit); | |
| 274 } | |
| 275 | |
| 276 inline bool ParMarkBitMap::is_marked(idx_t bit) const | |
| 277 { | |
| 278 return is_obj_beg(bit); | |
| 279 } | |
| 280 | |
| 281 inline bool ParMarkBitMap::is_marked(HeapWord* addr) const | |
| 282 { | |
| 283 return is_marked(addr_to_bit(addr)); | |
| 284 } | |
| 285 | |
| 286 inline bool ParMarkBitMap::is_marked(oop obj) const | |
| 287 { | |
| 288 return is_marked((HeapWord*)obj); | |
| 289 } | |
| 290 | |
| 291 inline bool ParMarkBitMap::is_unmarked(idx_t bit) const | |
| 292 { | |
| 293 return !is_marked(bit); | |
| 294 } | |
| 295 | |
| 296 inline bool ParMarkBitMap::is_unmarked(HeapWord* addr) const | |
| 297 { | |
| 298 return !is_marked(addr); | |
| 299 } | |
| 300 | |
| 301 inline bool ParMarkBitMap::is_unmarked(oop obj) const | |
| 302 { | |
| 303 return !is_marked(obj); | |
| 304 } | |
| 305 | |
| 306 inline size_t | |
| 307 ParMarkBitMap::bits_to_words(idx_t bits) | |
| 308 { | |
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309 return bits << obj_granularity_shift(); |
| 0 | 310 } |
| 311 | |
| 312 inline ParMarkBitMap::idx_t | |
| 313 ParMarkBitMap::words_to_bits(size_t words) | |
| 314 { | |
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315 return words >> obj_granularity_shift(); |
| 0 | 316 } |
| 317 | |
| 318 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit, idx_t end_bit) const | |
| 319 { | |
| 320 DEBUG_ONLY(verify_bit(beg_bit);) | |
| 321 DEBUG_ONLY(verify_bit(end_bit);) | |
| 322 return bits_to_words(end_bit - beg_bit + 1); | |
| 323 } | |
| 324 | |
| 325 inline size_t | |
| 326 ParMarkBitMap::obj_size(HeapWord* beg_addr, HeapWord* end_addr) const | |
| 327 { | |
| 328 DEBUG_ONLY(verify_addr(beg_addr);) | |
| 329 DEBUG_ONLY(verify_addr(end_addr);) | |
| 330 return pointer_delta(end_addr, beg_addr) + obj_granularity(); | |
| 331 } | |
| 332 | |
| 333 inline size_t ParMarkBitMap::obj_size(idx_t beg_bit) const | |
| 334 { | |
| 342 | 335 const idx_t end_bit = _end_bits.get_next_one_offset_inline(beg_bit, size()); |
| 0 | 336 assert(is_marked(beg_bit), "obj not marked"); |
| 337 assert(end_bit < size(), "end bit missing"); | |
| 338 return obj_size(beg_bit, end_bit); | |
| 339 } | |
| 340 | |
| 341 inline size_t ParMarkBitMap::obj_size(HeapWord* addr) const | |
| 342 { | |
| 343 return obj_size(addr_to_bit(addr)); | |
| 344 } | |
| 345 | |
| 346 inline size_t ParMarkBitMap::obj_size(oop obj) const | |
| 347 { | |
| 348 return obj_size((HeapWord*)obj); | |
| 349 } | |
| 350 | |
| 351 inline ParMarkBitMap::IterationStatus | |
| 352 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
| 353 HeapWord* range_beg, | |
| 354 HeapWord* range_end) const | |
| 355 { | |
| 356 return iterate(live_closure, addr_to_bit(range_beg), addr_to_bit(range_end)); | |
| 357 } | |
| 358 | |
| 359 inline ParMarkBitMap::IterationStatus | |
| 360 ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure, | |
| 361 ParMarkBitMapClosure* dead_closure, | |
| 362 HeapWord* range_beg, | |
| 363 HeapWord* range_end, | |
| 364 HeapWord* dead_range_end) const | |
| 365 { | |
| 366 return iterate(live_closure, dead_closure, | |
| 367 addr_to_bit(range_beg), addr_to_bit(range_end), | |
| 368 addr_to_bit(dead_range_end)); | |
| 369 } | |
| 370 | |
| 371 inline bool | |
| 372 ParMarkBitMap::mark_obj(oop obj, int size) | |
| 373 { | |
| 374 return mark_obj((HeapWord*)obj, (size_t)size); | |
| 375 } | |
| 376 | |
| 377 inline BitMap::idx_t | |
| 378 ParMarkBitMap::addr_to_bit(HeapWord* addr) const | |
| 379 { | |
| 380 DEBUG_ONLY(verify_addr(addr);) | |
| 381 return words_to_bits(pointer_delta(addr, region_start())); | |
| 382 } | |
| 383 | |
| 384 inline HeapWord* | |
| 385 ParMarkBitMap::bit_to_addr(idx_t bit) const | |
| 386 { | |
| 387 DEBUG_ONLY(verify_bit(bit);) | |
| 388 return region_start() + bits_to_words(bit); | |
| 389 } | |
| 390 | |
| 391 inline ParMarkBitMap::idx_t | |
| 392 ParMarkBitMap::find_obj_beg(idx_t beg, idx_t end) const | |
| 393 { | |
| 342 | 394 return _beg_bits.get_next_one_offset_inline_aligned_right(beg, end); |
| 0 | 395 } |
| 396 | |
| 397 inline ParMarkBitMap::idx_t | |
| 398 ParMarkBitMap::find_obj_end(idx_t beg, idx_t end) const | |
| 399 { | |
| 342 | 400 return _end_bits.get_next_one_offset_inline_aligned_right(beg, end); |
| 0 | 401 } |
| 402 | |
| 403 inline HeapWord* | |
| 404 ParMarkBitMap::find_obj_beg(HeapWord* beg, HeapWord* end) const | |
| 405 { | |
| 406 const idx_t beg_bit = addr_to_bit(beg); | |
| 407 const idx_t end_bit = addr_to_bit(end); | |
| 408 const idx_t search_end = BitMap::word_align_up(end_bit); | |
| 409 const idx_t res_bit = MIN2(find_obj_beg(beg_bit, search_end), end_bit); | |
| 410 return bit_to_addr(res_bit); | |
| 411 } | |
| 412 | |
| 413 inline HeapWord* | |
| 414 ParMarkBitMap::find_obj_end(HeapWord* beg, HeapWord* end) const | |
| 415 { | |
| 416 const idx_t beg_bit = addr_to_bit(beg); | |
| 417 const idx_t end_bit = addr_to_bit(end); | |
| 418 const idx_t search_end = BitMap::word_align_up(end_bit); | |
| 419 const idx_t res_bit = MIN2(find_obj_end(beg_bit, search_end), end_bit); | |
| 420 return bit_to_addr(res_bit); | |
| 421 } | |
| 422 | |
| 423 #ifdef ASSERT | |
| 424 inline void ParMarkBitMap::verify_bit(idx_t bit) const { | |
| 425 // Allow one past the last valid bit; useful for loop bounds. | |
| 426 assert(bit <= _beg_bits.size(), "bit out of range"); | |
| 427 } | |
| 428 | |
| 429 inline void ParMarkBitMap::verify_addr(HeapWord* addr) const { | |
| 430 // Allow one past the last valid address; useful for loop bounds. | |
| 431 assert(addr >= region_start(), "addr too small"); | |
| 432 assert(addr <= region_start() + region_size(), "addr too big"); | |
| 433 } | |
| 434 #endif // #ifdef ASSERT | |
| 1972 | 435 |
| 436 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARMARKBITMAP_HPP |