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annotate src/share/vm/utilities/bitMap.inline.hpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2005, 2013, 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_UTILITIES_BITMAP_INLINE_HPP |
| 26 #define SHARE_VM_UTILITIES_BITMAP_INLINE_HPP | |
| 27 | |
| 28 #include "runtime/atomic.hpp" | |
| 29 #include "utilities/bitMap.hpp" | |
| 30 | |
|
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31 #ifdef ASSERT |
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32 inline void BitMap::verify_index(idx_t index) const { |
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33 assert(index < _size, "BitMap index out of bounds"); |
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34 } |
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35 |
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36 inline void BitMap::verify_range(idx_t beg_index, idx_t end_index) const { |
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37 assert(beg_index <= end_index, "BitMap range error"); |
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38 // Note that [0,0) and [size,size) are both valid ranges. |
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39 if (end_index != _size) verify_index(end_index); |
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40 } |
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41 #endif // #ifdef ASSERT |
| 342 | 42 |
| 43 inline void BitMap::set_bit(idx_t bit) { | |
| 44 verify_index(bit); | |
| 45 *word_addr(bit) |= bit_mask(bit); | |
| 46 } | |
| 47 | |
| 48 inline void BitMap::clear_bit(idx_t bit) { | |
| 49 verify_index(bit); | |
| 50 *word_addr(bit) &= ~bit_mask(bit); | |
| 51 } | |
| 52 | |
| 0 | 53 inline bool BitMap::par_set_bit(idx_t bit) { |
| 54 verify_index(bit); | |
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55 volatile bm_word_t* const addr = word_addr(bit); |
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56 const bm_word_t mask = bit_mask(bit); |
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57 bm_word_t old_val = *addr; |
| 0 | 58 |
| 59 do { | |
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60 const bm_word_t new_val = old_val | mask; |
| 0 | 61 if (new_val == old_val) { |
| 62 return false; // Someone else beat us to it. | |
| 63 } | |
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64 const bm_word_t cur_val = (bm_word_t) Atomic::cmpxchg_ptr((void*) new_val, |
| 0 | 65 (volatile void*) addr, |
| 66 (void*) old_val); | |
| 67 if (cur_val == old_val) { | |
| 68 return true; // Success. | |
| 69 } | |
| 70 old_val = cur_val; // The value changed, try again. | |
| 71 } while (true); | |
| 72 } | |
| 73 | |
| 74 inline bool BitMap::par_clear_bit(idx_t bit) { | |
| 75 verify_index(bit); | |
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76 volatile bm_word_t* const addr = word_addr(bit); |
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77 const bm_word_t mask = ~bit_mask(bit); |
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78 bm_word_t old_val = *addr; |
| 0 | 79 |
| 80 do { | |
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81 const bm_word_t new_val = old_val & mask; |
| 0 | 82 if (new_val == old_val) { |
| 83 return false; // Someone else beat us to it. | |
| 84 } | |
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85 const bm_word_t cur_val = (bm_word_t) Atomic::cmpxchg_ptr((void*) new_val, |
| 0 | 86 (volatile void*) addr, |
| 87 (void*) old_val); | |
| 88 if (cur_val == old_val) { | |
| 89 return true; // Success. | |
| 90 } | |
| 91 old_val = cur_val; // The value changed, try again. | |
| 92 } while (true); | |
| 93 } | |
| 94 | |
| 342 | 95 inline void BitMap::set_range(idx_t beg, idx_t end, RangeSizeHint hint) { |
| 96 if (hint == small_range && end - beg == 1) { | |
| 97 set_bit(beg); | |
| 98 } else { | |
| 99 if (hint == large_range) { | |
| 100 set_large_range(beg, end); | |
| 101 } else { | |
| 102 set_range(beg, end); | |
| 103 } | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 inline void BitMap::clear_range(idx_t beg, idx_t end, RangeSizeHint hint) { | |
| 108 if (hint == small_range && end - beg == 1) { | |
| 109 clear_bit(beg); | |
| 110 } else { | |
| 111 if (hint == large_range) { | |
| 112 clear_large_range(beg, end); | |
| 113 } else { | |
| 114 clear_range(beg, end); | |
| 115 } | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 inline void BitMap::par_set_range(idx_t beg, idx_t end, RangeSizeHint hint) { | |
| 120 if (hint == small_range && end - beg == 1) { | |
| 121 par_at_put(beg, true); | |
| 122 } else { | |
| 123 if (hint == large_range) { | |
| 124 par_at_put_large_range(beg, end, true); | |
| 125 } else { | |
| 126 par_at_put_range(beg, end, true); | |
| 127 } | |
| 128 } | |
| 129 } | |
| 0 | 130 |
| 342 | 131 inline void BitMap::set_range_of_words(idx_t beg, idx_t end) { |
| 132 bm_word_t* map = _map; | |
| 133 for (idx_t i = beg; i < end; ++i) map[i] = ~(uintptr_t)0; | |
| 134 } | |
| 135 | |
| 136 | |
| 137 inline void BitMap::clear_range_of_words(idx_t beg, idx_t end) { | |
| 138 bm_word_t* map = _map; | |
| 139 for (idx_t i = beg; i < end; ++i) map[i] = 0; | |
| 140 } | |
| 141 | |
| 142 | |
| 143 inline void BitMap::clear() { | |
| 144 clear_range_of_words(0, size_in_words()); | |
| 145 } | |
| 146 | |
| 0 | 147 |
| 342 | 148 inline void BitMap::par_clear_range(idx_t beg, idx_t end, RangeSizeHint hint) { |
| 149 if (hint == small_range && end - beg == 1) { | |
| 150 par_at_put(beg, false); | |
| 151 } else { | |
| 152 if (hint == large_range) { | |
| 153 par_at_put_large_range(beg, end, false); | |
| 154 } else { | |
| 155 par_at_put_range(beg, end, false); | |
| 156 } | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 inline BitMap::idx_t | |
| 161 BitMap::get_next_one_offset_inline(idx_t l_offset, idx_t r_offset) const { | |
| 162 assert(l_offset <= size(), "BitMap index out of bounds"); | |
| 163 assert(r_offset <= size(), "BitMap index out of bounds"); | |
| 164 assert(l_offset <= r_offset, "l_offset > r_offset ?"); | |
| 165 | |
| 166 if (l_offset == r_offset) { | |
| 167 return l_offset; | |
| 168 } | |
| 169 idx_t index = word_index(l_offset); | |
| 170 idx_t r_index = word_index(r_offset-1) + 1; | |
| 171 idx_t res_offset = l_offset; | |
| 0 | 172 |
| 173 // check bits including and to the _left_ of offset's position | |
| 342 | 174 idx_t pos = bit_in_word(res_offset); |
| 175 idx_t res = map(index) >> pos; | |
| 176 if (res != (uintptr_t)NoBits) { | |
| 0 | 177 // find the position of the 1-bit |
| 342 | 178 for (; !(res & 1); res_offset++) { |
| 0 | 179 res = res >> 1; |
| 180 } | |
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181 |
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182 #ifdef ASSERT |
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183 // In the following assert, if r_offset is not bitamp word aligned, |
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184 // checking that res_offset is strictly less than r_offset is too |
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185 // strong and will trip the assert. |
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186 // |
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187 // Consider the case where l_offset is bit 15 and r_offset is bit 17 |
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188 // of the same map word, and where bits [15:16:17:18] == [00:00:00:01]. |
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189 // All the bits in the range [l_offset:r_offset) are 0. |
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190 // The loop that calculates res_offset, above, would yield the offset |
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191 // of bit 18 because it's in the same map word as l_offset and there |
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192 // is a set bit in that map word above l_offset (i.e. res != NoBits). |
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193 // |
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194 // In this case, however, we can assert is that res_offset is strictly |
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195 // less than size() since we know that there is at least one set bit |
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196 // at an offset above, but in the same map word as, r_offset. |
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197 // Otherwise, if r_offset is word aligned then it will not be in the |
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198 // same map word as l_offset (unless it equals l_offset). So either |
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199 // there won't be a set bit between l_offset and the end of it's map |
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200 // word (i.e. res == NoBits), or res_offset will be less than r_offset. |
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201 |
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202 idx_t limit = is_word_aligned(r_offset) ? r_offset : size(); |
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203 assert(res_offset >= l_offset && res_offset < limit, "just checking"); |
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204 #endif // ASSERT |
| 342 | 205 return MIN2(res_offset, r_offset); |
| 0 | 206 } |
| 207 // skip over all word length 0-bit runs | |
| 208 for (index++; index < r_index; index++) { | |
| 209 res = map(index); | |
| 342 | 210 if (res != (uintptr_t)NoBits) { |
| 0 | 211 // found a 1, return the offset |
| 342 | 212 for (res_offset = bit_index(index); !(res & 1); res_offset++) { |
| 0 | 213 res = res >> 1; |
| 214 } | |
| 215 assert(res & 1, "tautology; see loop condition"); | |
| 342 | 216 assert(res_offset >= l_offset, "just checking"); |
| 217 return MIN2(res_offset, r_offset); | |
| 218 } | |
| 219 } | |
| 220 return r_offset; | |
| 221 } | |
| 222 | |
| 223 inline BitMap::idx_t | |
| 224 BitMap::get_next_zero_offset_inline(idx_t l_offset, idx_t r_offset) const { | |
| 225 assert(l_offset <= size(), "BitMap index out of bounds"); | |
| 226 assert(r_offset <= size(), "BitMap index out of bounds"); | |
| 227 assert(l_offset <= r_offset, "l_offset > r_offset ?"); | |
| 228 | |
| 229 if (l_offset == r_offset) { | |
| 230 return l_offset; | |
| 231 } | |
| 232 idx_t index = word_index(l_offset); | |
| 233 idx_t r_index = word_index(r_offset-1) + 1; | |
| 234 idx_t res_offset = l_offset; | |
| 235 | |
| 236 // check bits including and to the _left_ of offset's position | |
| 237 idx_t pos = res_offset & (BitsPerWord - 1); | |
| 238 idx_t res = (map(index) >> pos) | left_n_bits((int)pos); | |
| 239 | |
| 240 if (res != (uintptr_t)AllBits) { | |
| 241 // find the position of the 0-bit | |
| 242 for (; res & 1; res_offset++) { | |
| 243 res = res >> 1; | |
| 244 } | |
| 245 assert(res_offset >= l_offset, "just checking"); | |
| 246 return MIN2(res_offset, r_offset); | |
| 247 } | |
| 248 // skip over all word length 1-bit runs | |
| 249 for (index++; index < r_index; index++) { | |
| 250 res = map(index); | |
| 251 if (res != (uintptr_t)AllBits) { | |
| 252 // found a 0, return the offset | |
| 253 for (res_offset = index << LogBitsPerWord; res & 1; | |
| 254 res_offset++) { | |
| 255 res = res >> 1; | |
| 256 } | |
| 257 assert(!(res & 1), "tautology; see loop condition"); | |
| 258 assert(res_offset >= l_offset, "just checking"); | |
| 259 return MIN2(res_offset, r_offset); | |
| 0 | 260 } |
| 261 } | |
| 342 | 262 return r_offset; |
| 263 } | |
| 264 | |
| 265 inline BitMap::idx_t | |
| 266 BitMap::get_next_one_offset_inline_aligned_right(idx_t l_offset, | |
| 267 idx_t r_offset) const | |
| 268 { | |
| 269 verify_range(l_offset, r_offset); | |
| 270 assert(bit_in_word(r_offset) == 0, "r_offset not word-aligned"); | |
| 271 | |
| 272 if (l_offset == r_offset) { | |
| 273 return l_offset; | |
| 274 } | |
| 275 idx_t index = word_index(l_offset); | |
| 276 idx_t r_index = word_index(r_offset); | |
| 277 idx_t res_offset = l_offset; | |
| 278 | |
| 279 // check bits including and to the _left_ of offset's position | |
| 280 idx_t res = map(index) >> bit_in_word(res_offset); | |
| 281 if (res != (uintptr_t)NoBits) { | |
| 282 // find the position of the 1-bit | |
| 283 for (; !(res & 1); res_offset++) { | |
| 284 res = res >> 1; | |
| 285 } | |
| 286 assert(res_offset >= l_offset && | |
| 287 res_offset < r_offset, "just checking"); | |
| 288 return res_offset; | |
| 289 } | |
| 290 // skip over all word length 0-bit runs | |
| 291 for (index++; index < r_index; index++) { | |
| 292 res = map(index); | |
| 293 if (res != (uintptr_t)NoBits) { | |
| 294 // found a 1, return the offset | |
| 295 for (res_offset = bit_index(index); !(res & 1); res_offset++) { | |
| 296 res = res >> 1; | |
| 297 } | |
| 298 assert(res & 1, "tautology; see loop condition"); | |
| 299 assert(res_offset >= l_offset && res_offset < r_offset, "just checking"); | |
| 300 return res_offset; | |
| 301 } | |
| 302 } | |
| 303 return r_offset; | |
| 0 | 304 } |
| 342 | 305 |
| 306 | |
| 307 // Returns a bit mask for a range of bits [beg, end) within a single word. Each | |
| 308 // bit in the mask is 0 if the bit is in the range, 1 if not in the range. The | |
| 309 // returned mask can be used directly to clear the range, or inverted to set the | |
| 310 // range. Note: end must not be 0. | |
| 311 inline BitMap::bm_word_t | |
| 312 BitMap::inverted_bit_mask_for_range(idx_t beg, idx_t end) const { | |
| 313 assert(end != 0, "does not work when end == 0"); | |
| 314 assert(beg == end || word_index(beg) == word_index(end - 1), | |
| 315 "must be a single-word range"); | |
| 316 bm_word_t mask = bit_mask(beg) - 1; // low (right) bits | |
| 317 if (bit_in_word(end) != 0) { | |
| 318 mask |= ~(bit_mask(end) - 1); // high (left) bits | |
| 319 } | |
| 320 return mask; | |
| 321 } | |
| 322 | |
| 323 inline void BitMap::set_large_range_of_words(idx_t beg, idx_t end) { | |
| 324 memset(_map + beg, ~(unsigned char)0, (end - beg) * sizeof(uintptr_t)); | |
| 325 } | |
| 326 | |
| 327 inline void BitMap::clear_large_range_of_words(idx_t beg, idx_t end) { | |
| 328 memset(_map + beg, 0, (end - beg) * sizeof(uintptr_t)); | |
| 329 } | |
| 330 | |
| 331 inline BitMap::idx_t BitMap::word_index_round_up(idx_t bit) const { | |
| 332 idx_t bit_rounded_up = bit + (BitsPerWord - 1); | |
| 333 // Check for integer arithmetic overflow. | |
| 334 return bit_rounded_up > bit ? word_index(bit_rounded_up) : size_in_words(); | |
| 335 } | |
| 336 | |
| 337 inline BitMap::idx_t BitMap::get_next_one_offset(idx_t l_offset, | |
| 338 idx_t r_offset) const { | |
| 339 return get_next_one_offset_inline(l_offset, r_offset); | |
| 340 } | |
| 341 | |
| 342 inline BitMap::idx_t BitMap::get_next_zero_offset(idx_t l_offset, | |
| 343 idx_t r_offset) const { | |
| 344 return get_next_zero_offset_inline(l_offset, r_offset); | |
| 345 } | |
| 346 | |
| 347 inline void BitMap2D::clear() { | |
| 348 _map.clear(); | |
| 349 } | |
| 1972 | 350 |
| 351 #endif // SHARE_VM_UTILITIES_BITMAP_INLINE_HPP |