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annotate src/share/vm/utilities/bitMap.inline.hpp @ 3763:e66f38dd58a9
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author | ysr |
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
parents | f95d63e2154a |
children | 2e966d967c5c |
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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 * | |
1552
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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 | |
809
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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); | |
55 volatile idx_t* const addr = word_addr(bit); | |
56 const idx_t mask = bit_mask(bit); | |
57 idx_t old_val = *addr; | |
58 | |
59 do { | |
60 const idx_t new_val = old_val | mask; | |
61 if (new_val == old_val) { | |
62 return false; // Someone else beat us to it. | |
63 } | |
64 const idx_t cur_val = (idx_t) Atomic::cmpxchg_ptr((void*) new_val, | |
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); | |
76 volatile idx_t* const addr = word_addr(bit); | |
77 const idx_t mask = ~bit_mask(bit); | |
78 idx_t old_val = *addr; | |
79 | |
80 do { | |
81 const idx_t new_val = old_val & mask; | |
82 if (new_val == old_val) { | |
83 return false; // Someone else beat us to it. | |
84 } | |
85 const idx_t cur_val = (idx_t) Atomic::cmpxchg_ptr((void*) new_val, | |
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 } | |
342 | 181 assert(res_offset >= l_offset && |
182 res_offset < r_offset, "just checking"); | |
183 return MIN2(res_offset, r_offset); | |
0 | 184 } |
185 // skip over all word length 0-bit runs | |
186 for (index++; index < r_index; index++) { | |
187 res = map(index); | |
342 | 188 if (res != (uintptr_t)NoBits) { |
0 | 189 // found a 1, return the offset |
342 | 190 for (res_offset = bit_index(index); !(res & 1); res_offset++) { |
0 | 191 res = res >> 1; |
192 } | |
193 assert(res & 1, "tautology; see loop condition"); | |
342 | 194 assert(res_offset >= l_offset, "just checking"); |
195 return MIN2(res_offset, r_offset); | |
196 } | |
197 } | |
198 return r_offset; | |
199 } | |
200 | |
201 inline BitMap::idx_t | |
202 BitMap::get_next_zero_offset_inline(idx_t l_offset, idx_t r_offset) const { | |
203 assert(l_offset <= size(), "BitMap index out of bounds"); | |
204 assert(r_offset <= size(), "BitMap index out of bounds"); | |
205 assert(l_offset <= r_offset, "l_offset > r_offset ?"); | |
206 | |
207 if (l_offset == r_offset) { | |
208 return l_offset; | |
209 } | |
210 idx_t index = word_index(l_offset); | |
211 idx_t r_index = word_index(r_offset-1) + 1; | |
212 idx_t res_offset = l_offset; | |
213 | |
214 // check bits including and to the _left_ of offset's position | |
215 idx_t pos = res_offset & (BitsPerWord - 1); | |
216 idx_t res = (map(index) >> pos) | left_n_bits((int)pos); | |
217 | |
218 if (res != (uintptr_t)AllBits) { | |
219 // find the position of the 0-bit | |
220 for (; res & 1; res_offset++) { | |
221 res = res >> 1; | |
222 } | |
223 assert(res_offset >= l_offset, "just checking"); | |
224 return MIN2(res_offset, r_offset); | |
225 } | |
226 // skip over all word length 1-bit runs | |
227 for (index++; index < r_index; index++) { | |
228 res = map(index); | |
229 if (res != (uintptr_t)AllBits) { | |
230 // found a 0, return the offset | |
231 for (res_offset = index << LogBitsPerWord; res & 1; | |
232 res_offset++) { | |
233 res = res >> 1; | |
234 } | |
235 assert(!(res & 1), "tautology; see loop condition"); | |
236 assert(res_offset >= l_offset, "just checking"); | |
237 return MIN2(res_offset, r_offset); | |
0 | 238 } |
239 } | |
342 | 240 return r_offset; |
241 } | |
242 | |
243 inline BitMap::idx_t | |
244 BitMap::get_next_one_offset_inline_aligned_right(idx_t l_offset, | |
245 idx_t r_offset) const | |
246 { | |
247 verify_range(l_offset, r_offset); | |
248 assert(bit_in_word(r_offset) == 0, "r_offset not word-aligned"); | |
249 | |
250 if (l_offset == r_offset) { | |
251 return l_offset; | |
252 } | |
253 idx_t index = word_index(l_offset); | |
254 idx_t r_index = word_index(r_offset); | |
255 idx_t res_offset = l_offset; | |
256 | |
257 // check bits including and to the _left_ of offset's position | |
258 idx_t res = map(index) >> bit_in_word(res_offset); | |
259 if (res != (uintptr_t)NoBits) { | |
260 // find the position of the 1-bit | |
261 for (; !(res & 1); res_offset++) { | |
262 res = res >> 1; | |
263 } | |
264 assert(res_offset >= l_offset && | |
265 res_offset < r_offset, "just checking"); | |
266 return res_offset; | |
267 } | |
268 // skip over all word length 0-bit runs | |
269 for (index++; index < r_index; index++) { | |
270 res = map(index); | |
271 if (res != (uintptr_t)NoBits) { | |
272 // found a 1, return the offset | |
273 for (res_offset = bit_index(index); !(res & 1); res_offset++) { | |
274 res = res >> 1; | |
275 } | |
276 assert(res & 1, "tautology; see loop condition"); | |
277 assert(res_offset >= l_offset && res_offset < r_offset, "just checking"); | |
278 return res_offset; | |
279 } | |
280 } | |
281 return r_offset; | |
0 | 282 } |
342 | 283 |
284 | |
285 // Returns a bit mask for a range of bits [beg, end) within a single word. Each | |
286 // bit in the mask is 0 if the bit is in the range, 1 if not in the range. The | |
287 // returned mask can be used directly to clear the range, or inverted to set the | |
288 // range. Note: end must not be 0. | |
289 inline BitMap::bm_word_t | |
290 BitMap::inverted_bit_mask_for_range(idx_t beg, idx_t end) const { | |
291 assert(end != 0, "does not work when end == 0"); | |
292 assert(beg == end || word_index(beg) == word_index(end - 1), | |
293 "must be a single-word range"); | |
294 bm_word_t mask = bit_mask(beg) - 1; // low (right) bits | |
295 if (bit_in_word(end) != 0) { | |
296 mask |= ~(bit_mask(end) - 1); // high (left) bits | |
297 } | |
298 return mask; | |
299 } | |
300 | |
301 inline void BitMap::set_large_range_of_words(idx_t beg, idx_t end) { | |
302 memset(_map + beg, ~(unsigned char)0, (end - beg) * sizeof(uintptr_t)); | |
303 } | |
304 | |
305 inline void BitMap::clear_large_range_of_words(idx_t beg, idx_t end) { | |
306 memset(_map + beg, 0, (end - beg) * sizeof(uintptr_t)); | |
307 } | |
308 | |
309 inline BitMap::idx_t BitMap::word_index_round_up(idx_t bit) const { | |
310 idx_t bit_rounded_up = bit + (BitsPerWord - 1); | |
311 // Check for integer arithmetic overflow. | |
312 return bit_rounded_up > bit ? word_index(bit_rounded_up) : size_in_words(); | |
313 } | |
314 | |
315 inline BitMap::idx_t BitMap::get_next_one_offset(idx_t l_offset, | |
316 idx_t r_offset) const { | |
317 return get_next_one_offset_inline(l_offset, r_offset); | |
318 } | |
319 | |
320 inline BitMap::idx_t BitMap::get_next_zero_offset(idx_t l_offset, | |
321 idx_t r_offset) const { | |
322 return get_next_zero_offset_inline(l_offset, r_offset); | |
323 } | |
324 | |
325 inline void BitMap2D::clear() { | |
326 _map.clear(); | |
327 } | |
1972 | 328 |
329 #endif // SHARE_VM_UTILITIES_BITMAP_INLINE_HPP |