0
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1 /*
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2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_bitMap.cpp.incl"
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27
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28
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29 BitMap::BitMap(idx_t* map, idx_t size_in_bits) {
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30 assert(size_in_bits >= 0, "just checking");
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31 _map = map;
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32 _size = size_in_bits;
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33 }
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34
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35
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36 BitMap::BitMap(idx_t size_in_bits) {
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37 assert(size_in_bits >= 0, "just checking");
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38 _size = size_in_bits;
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39 _map = NEW_RESOURCE_ARRAY(idx_t, size_in_words());
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40 }
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41
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42
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43 void BitMap::resize(idx_t size_in_bits) {
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44 assert(size_in_bits >= 0, "just checking");
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45 size_t old_size_in_words = size_in_words();
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46 uintptr_t* old_map = map();
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47 _size = size_in_bits;
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48 size_t new_size_in_words = size_in_words();
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49 _map = NEW_RESOURCE_ARRAY(idx_t, new_size_in_words);
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50 Copy::disjoint_words((HeapWord*) old_map, (HeapWord*) _map, MIN2(old_size_in_words, new_size_in_words));
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51 if (new_size_in_words > old_size_in_words) {
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52 clear_range_of_words(old_size_in_words, size_in_words());
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53 }
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54 }
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55
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56 // Returns a bit mask for a range of bits [beg, end) within a single word. Each
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57 // bit in the mask is 0 if the bit is in the range, 1 if not in the range. The
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58 // returned mask can be used directly to clear the range, or inverted to set the
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59 // range. Note: end must not be 0.
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60 inline BitMap::idx_t
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61 BitMap::inverted_bit_mask_for_range(idx_t beg, idx_t end) const {
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62 assert(end != 0, "does not work when end == 0");
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63 assert(beg == end || word_index(beg) == word_index(end - 1),
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64 "must be a single-word range");
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65 idx_t mask = bit_mask(beg) - 1; // low (right) bits
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66 if (bit_in_word(end) != 0) {
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67 mask |= ~(bit_mask(end) - 1); // high (left) bits
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68 }
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69 return mask;
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70 }
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71
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72 void BitMap::set_range_within_word(idx_t beg, idx_t end) {
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73 // With a valid range (beg <= end), this test ensures that end != 0, as
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74 // required by inverted_bit_mask_for_range. Also avoids an unnecessary write.
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75 if (beg != end) {
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76 idx_t mask = inverted_bit_mask_for_range(beg, end);
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77 *word_addr(beg) |= ~mask;
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78 }
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79 }
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80
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81 void BitMap::clear_range_within_word(idx_t beg, idx_t end) {
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82 // With a valid range (beg <= end), this test ensures that end != 0, as
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83 // required by inverted_bit_mask_for_range. Also avoids an unnecessary write.
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84 if (beg != end) {
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85 idx_t mask = inverted_bit_mask_for_range(beg, end);
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86 *word_addr(beg) &= mask;
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87 }
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88 }
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89
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90 void BitMap::par_put_range_within_word(idx_t beg, idx_t end, bool value) {
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91 assert(value == 0 || value == 1, "0 for clear, 1 for set");
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92 // With a valid range (beg <= end), this test ensures that end != 0, as
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93 // required by inverted_bit_mask_for_range. Also avoids an unnecessary write.
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94 if (beg != end) {
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95 intptr_t* pw = (intptr_t*)word_addr(beg);
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96 intptr_t w = *pw;
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97 intptr_t mr = (intptr_t)inverted_bit_mask_for_range(beg, end);
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98 intptr_t nw = value ? (w | ~mr) : (w & mr);
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99 while (true) {
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100 intptr_t res = Atomic::cmpxchg_ptr(nw, pw, w);
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101 if (res == w) break;
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102 w = *pw;
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103 nw = value ? (w | ~mr) : (w & mr);
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104 }
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105 }
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106 }
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107
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108 inline void BitMap::set_large_range_of_words(idx_t beg, idx_t end) {
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109 memset(_map + beg, ~(unsigned char)0, (end - beg) * sizeof(uintptr_t));
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110 }
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111
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112 inline void BitMap::clear_large_range_of_words(idx_t beg, idx_t end) {
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113 memset(_map + beg, 0, (end - beg) * sizeof(uintptr_t));
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114 }
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115
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116 inline BitMap::idx_t BitMap::word_index_round_up(idx_t bit) const {
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117 idx_t bit_rounded_up = bit + (BitsPerWord - 1);
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118 // Check for integer arithmetic overflow.
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119 return bit_rounded_up > bit ? word_index(bit_rounded_up) : size_in_words();
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120 }
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121
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122 void BitMap::set_range(idx_t beg, idx_t end) {
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123 verify_range(beg, end);
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124
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125 idx_t beg_full_word = word_index_round_up(beg);
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126 idx_t end_full_word = word_index(end);
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127
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128 if (beg_full_word < end_full_word) {
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129 // The range includes at least one full word.
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130 set_range_within_word(beg, bit_index(beg_full_word));
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131 set_range_of_words(beg_full_word, end_full_word);
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132 set_range_within_word(bit_index(end_full_word), end);
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133 } else {
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134 // The range spans at most 2 partial words.
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135 idx_t boundary = MIN2(bit_index(beg_full_word), end);
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136 set_range_within_word(beg, boundary);
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137 set_range_within_word(boundary, end);
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138 }
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139 }
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140
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141 void BitMap::clear_range(idx_t beg, idx_t end) {
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142 verify_range(beg, end);
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143
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144 idx_t beg_full_word = word_index_round_up(beg);
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145 idx_t end_full_word = word_index(end);
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146
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147 if (beg_full_word < end_full_word) {
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148 // The range includes at least one full word.
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149 clear_range_within_word(beg, bit_index(beg_full_word));
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150 clear_range_of_words(beg_full_word, end_full_word);
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151 clear_range_within_word(bit_index(end_full_word), end);
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152 } else {
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153 // The range spans at most 2 partial words.
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154 idx_t boundary = MIN2(bit_index(beg_full_word), end);
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155 clear_range_within_word(beg, boundary);
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156 clear_range_within_word(boundary, end);
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157 }
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158 }
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159
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160 void BitMap::set_large_range(idx_t beg, idx_t end) {
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161 verify_range(beg, end);
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162
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163 idx_t beg_full_word = word_index_round_up(beg);
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164 idx_t end_full_word = word_index(end);
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165
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166 assert(end_full_word - beg_full_word >= 32,
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167 "the range must include at least 32 bytes");
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168
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169 // The range includes at least one full word.
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170 set_range_within_word(beg, bit_index(beg_full_word));
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171 set_large_range_of_words(beg_full_word, end_full_word);
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172 set_range_within_word(bit_index(end_full_word), end);
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173 }
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174
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175 void BitMap::clear_large_range(idx_t beg, idx_t end) {
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176 verify_range(beg, end);
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177
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178 idx_t beg_full_word = word_index_round_up(beg);
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179 idx_t end_full_word = word_index(end);
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180
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181 assert(end_full_word - beg_full_word >= 32,
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182 "the range must include at least 32 bytes");
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183
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184 // The range includes at least one full word.
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185 clear_range_within_word(beg, bit_index(beg_full_word));
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186 clear_large_range_of_words(beg_full_word, end_full_word);
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187 clear_range_within_word(bit_index(end_full_word), end);
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188 }
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189
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190 void BitMap::at_put(idx_t offset, bool value) {
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191 if (value) {
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192 set_bit(offset);
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193 } else {
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194 clear_bit(offset);
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195 }
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196 }
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197
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198 // Return true to indicate that this thread changed
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199 // the bit, false to indicate that someone else did.
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200 // In either case, the requested bit is in the
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201 // requested state some time during the period that
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202 // this thread is executing this call. More importantly,
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203 // if no other thread is executing an action to
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204 // change the requested bit to a state other than
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205 // the one that this thread is trying to set it to,
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206 // then the the bit is in the expected state
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207 // at exit from this method. However, rather than
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208 // make such a strong assertion here, based on
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209 // assuming such constrained use (which though true
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210 // today, could change in the future to service some
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211 // funky parallel algorithm), we encourage callers
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212 // to do such verification, as and when appropriate.
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213 bool BitMap::par_at_put(idx_t bit, bool value) {
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214 return value ? par_set_bit(bit) : par_clear_bit(bit);
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215 }
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216
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217 void BitMap::at_put_grow(idx_t offset, bool value) {
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218 if (offset >= size()) {
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219 resize(2 * MAX2(size(), offset));
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220 }
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221 at_put(offset, value);
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222 }
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223
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224 void BitMap::at_put_range(idx_t start_offset, idx_t end_offset, bool value) {
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225 if (value) {
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226 set_range(start_offset, end_offset);
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227 } else {
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228 clear_range(start_offset, end_offset);
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229 }
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230 }
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231
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232 void BitMap::par_at_put_range(idx_t beg, idx_t end, bool value) {
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233 verify_range(beg, end);
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234
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235 idx_t beg_full_word = word_index_round_up(beg);
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236 idx_t end_full_word = word_index(end);
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237
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238 if (beg_full_word < end_full_word) {
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239 // The range includes at least one full word.
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240 par_put_range_within_word(beg, bit_index(beg_full_word), value);
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241 if (value) {
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242 set_range_of_words(beg_full_word, end_full_word);
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243 } else {
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244 clear_range_of_words(beg_full_word, end_full_word);
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245 }
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246 par_put_range_within_word(bit_index(end_full_word), end, value);
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247 } else {
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248 // The range spans at most 2 partial words.
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249 idx_t boundary = MIN2(bit_index(beg_full_word), end);
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250 par_put_range_within_word(beg, boundary, value);
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251 par_put_range_within_word(boundary, end, value);
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252 }
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253
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254 }
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255
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256 void BitMap::at_put_large_range(idx_t beg, idx_t end, bool value) {
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257 if (value) {
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258 set_large_range(beg, end);
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259 } else {
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260 clear_large_range(beg, end);
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261 }
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262 }
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263
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264 void BitMap::par_at_put_large_range(idx_t beg, idx_t end, bool value) {
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265 verify_range(beg, end);
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266
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267 idx_t beg_full_word = word_index_round_up(beg);
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268 idx_t end_full_word = word_index(end);
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269
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270 assert(end_full_word - beg_full_word >= 32,
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271 "the range must include at least 32 bytes");
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272
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273 // The range includes at least one full word.
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274 par_put_range_within_word(beg, bit_index(beg_full_word), value);
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275 if (value) {
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276 set_large_range_of_words(beg_full_word, end_full_word);
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277 } else {
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278 clear_large_range_of_words(beg_full_word, end_full_word);
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279 }
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280 par_put_range_within_word(bit_index(end_full_word), end, value);
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281 }
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282
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283 bool BitMap::contains(const BitMap other) const {
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284 assert(size() == other.size(), "must have same size");
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285 uintptr_t* dest_map = map();
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286 uintptr_t* other_map = other.map();
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287 idx_t size = size_in_words();
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288 for (idx_t index = 0; index < size_in_words(); index++) {
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289 uintptr_t word_union = dest_map[index] | other_map[index];
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290 // If this has more bits set than dest_map[index], then other is not a
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291 // subset.
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292 if (word_union != dest_map[index]) return false;
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293 }
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294 return true;
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295 }
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296
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297 bool BitMap::intersects(const BitMap other) const {
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298 assert(size() == other.size(), "must have same size");
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299 uintptr_t* dest_map = map();
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300 uintptr_t* other_map = other.map();
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301 idx_t size = size_in_words();
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302 for (idx_t index = 0; index < size_in_words(); index++) {
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303 if ((dest_map[index] & other_map[index]) != 0) return true;
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304 }
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305 // Otherwise, no intersection.
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306 return false;
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307 }
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308
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309 void BitMap::set_union(BitMap other) {
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310 assert(size() == other.size(), "must have same size");
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311 idx_t* dest_map = map();
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312 idx_t* other_map = other.map();
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313 idx_t size = size_in_words();
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314 for (idx_t index = 0; index < size_in_words(); index++) {
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315 dest_map[index] = dest_map[index] | other_map[index];
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316 }
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317 }
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318
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319
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320 void BitMap::set_difference(BitMap other) {
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321 assert(size() == other.size(), "must have same size");
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322 idx_t* dest_map = map();
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323 idx_t* other_map = other.map();
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324 idx_t size = size_in_words();
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325 for (idx_t index = 0; index < size_in_words(); index++) {
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326 dest_map[index] = dest_map[index] & ~(other_map[index]);
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327 }
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328 }
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329
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330
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331 void BitMap::set_intersection(BitMap other) {
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332 assert(size() == other.size(), "must have same size");
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333 idx_t* dest_map = map();
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334 idx_t* other_map = other.map();
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335 idx_t size = size_in_words();
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336 for (idx_t index = 0; index < size; index++) {
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337 dest_map[index] = dest_map[index] & other_map[index];
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338 }
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339 }
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340
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341
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342 bool BitMap::set_union_with_result(BitMap other) {
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343 assert(size() == other.size(), "must have same size");
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344 bool changed = false;
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345 idx_t* dest_map = map();
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346 idx_t* other_map = other.map();
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347 idx_t size = size_in_words();
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348 for (idx_t index = 0; index < size; index++) {
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349 idx_t temp = map(index) | other_map[index];
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350 changed = changed || (temp != map(index));
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351 map()[index] = temp;
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352 }
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353 return changed;
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354 }
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355
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356
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357 bool BitMap::set_difference_with_result(BitMap other) {
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358 assert(size() == other.size(), "must have same size");
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359 bool changed = false;
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360 idx_t* dest_map = map();
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361 idx_t* other_map = other.map();
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362 idx_t size = size_in_words();
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363 for (idx_t index = 0; index < size; index++) {
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364 idx_t temp = dest_map[index] & ~(other_map[index]);
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365 changed = changed || (temp != dest_map[index]);
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366 dest_map[index] = temp;
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367 }
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368 return changed;
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369 }
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370
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371
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372 bool BitMap::set_intersection_with_result(BitMap other) {
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373 assert(size() == other.size(), "must have same size");
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374 bool changed = false;
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375 idx_t* dest_map = map();
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376 idx_t* other_map = other.map();
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377 idx_t size = size_in_words();
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378 for (idx_t index = 0; index < size; index++) {
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379 idx_t orig = dest_map[index];
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380 idx_t temp = orig & other_map[index];
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381 changed = changed || (temp != orig);
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382 dest_map[index] = temp;
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383 }
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384 return changed;
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385 }
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386
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387
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388 void BitMap::set_from(BitMap other) {
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389 assert(size() == other.size(), "must have same size");
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390 idx_t* dest_map = map();
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391 idx_t* other_map = other.map();
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392 idx_t size = size_in_words();
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393 for (idx_t index = 0; index < size; index++) {
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394 dest_map[index] = other_map[index];
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395 }
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396 }
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397
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398
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399 bool BitMap::is_same(BitMap other) {
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400 assert(size() == other.size(), "must have same size");
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401 idx_t* dest_map = map();
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402 idx_t* other_map = other.map();
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403 idx_t size = size_in_words();
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404 for (idx_t index = 0; index < size; index++) {
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405 if (dest_map[index] != other_map[index]) return false;
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406 }
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407 return true;
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408 }
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409
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410 bool BitMap::is_full() const {
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411 uintptr_t* word = map();
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412 idx_t rest = size();
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413 for (; rest >= (idx_t) BitsPerWord; rest -= BitsPerWord) {
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414 if (*word != (uintptr_t) AllBits) return false;
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415 word++;
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416 }
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417 return rest == 0 || (*word | ~right_n_bits((int)rest)) == (uintptr_t) AllBits;
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418 }
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419
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420
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421 bool BitMap::is_empty() const {
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422 uintptr_t* word = map();
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423 idx_t rest = size();
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424 for (; rest >= (idx_t) BitsPerWord; rest -= BitsPerWord) {
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425 if (*word != (uintptr_t) NoBits) return false;
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426 word++;
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427 }
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428 return rest == 0 || (*word & right_n_bits((int)rest)) == (uintptr_t) NoBits;
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429 }
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430
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431 void BitMap::clear_large() {
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432 clear_large_range_of_words(0, size_in_words());
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433 }
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434
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435 // Note that if the closure itself modifies the bitmap
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436 // then modifications in and to the left of the _bit_ being
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437 // currently sampled will not be seen. Note also that the
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438 // interval [leftOffset, rightOffset) is right open.
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439 void BitMap::iterate(BitMapClosure* blk, idx_t leftOffset, idx_t rightOffset) {
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440 verify_range(leftOffset, rightOffset);
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441
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442 idx_t startIndex = word_index(leftOffset);
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443 idx_t endIndex = MIN2(word_index(rightOffset) + 1, size_in_words());
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444 for (idx_t index = startIndex, offset = leftOffset;
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445 offset < rightOffset && index < endIndex;
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446 offset = (++index) << LogBitsPerWord) {
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447 idx_t rest = map(index) >> (offset & (BitsPerWord - 1));
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448 for (; offset < rightOffset && rest != (uintptr_t)NoBits; offset++) {
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449 if (rest & 1) {
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450 blk->do_bit(offset);
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451 // resample at each closure application
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452 // (see, for instance, CMS bug 4525989)
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453 rest = map(index) >> (offset & (BitsPerWord -1));
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454 // XXX debugging: remove
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455 // The following assertion assumes that closure application
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456 // doesn't clear bits (may not be true in general, e.g. G1).
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457 assert(rest & 1,
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458 "incorrect shift or closure application can clear bits?");
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459 }
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460 rest = rest >> 1;
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461 }
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462 }
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463 }
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464
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465 BitMap::idx_t BitMap::get_next_one_offset(idx_t l_offset,
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466 idx_t r_offset) const {
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467 assert(l_offset <= size(), "BitMap index out of bounds");
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468 assert(r_offset <= size(), "BitMap index out of bounds");
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469 assert(l_offset <= r_offset, "l_offset > r_offset ?");
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470
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471 if (l_offset == r_offset) {
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472 return l_offset;
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473 }
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474 idx_t index = word_index(l_offset);
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475 idx_t r_index = word_index(r_offset-1) + 1;
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476 idx_t res_offset = l_offset;
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477
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478 // check bits including and to the _left_ of offset's position
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479 idx_t pos = bit_in_word(res_offset);
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480 idx_t res = map(index) >> pos;
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481 if (res != (uintptr_t)NoBits) {
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|
482 // find the position of the 1-bit
|
|
483 for (; !(res & 1); res_offset++) {
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|
484 res = res >> 1;
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|
485 }
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|
486 assert(res_offset >= l_offset, "just checking");
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|
487 return MIN2(res_offset, r_offset);
|
|
488 }
|
|
489 // skip over all word length 0-bit runs
|
|
490 for (index++; index < r_index; index++) {
|
|
491 res = map(index);
|
|
492 if (res != (uintptr_t)NoBits) {
|
|
493 // found a 1, return the offset
|
|
494 for (res_offset = index << LogBitsPerWord; !(res & 1);
|
|
495 res_offset++) {
|
|
496 res = res >> 1;
|
|
497 }
|
|
498 assert(res & 1, "tautology; see loop condition");
|
|
499 assert(res_offset >= l_offset, "just checking");
|
|
500 return MIN2(res_offset, r_offset);
|
|
501 }
|
|
502 }
|
|
503 return r_offset;
|
|
504 }
|
|
505
|
|
506 BitMap::idx_t BitMap::get_next_zero_offset(idx_t l_offset,
|
|
507 idx_t r_offset) const {
|
|
508 assert(l_offset <= size(), "BitMap index out of bounds");
|
|
509 assert(r_offset <= size(), "BitMap index out of bounds");
|
|
510 assert(l_offset <= r_offset, "l_offset > r_offset ?");
|
|
511
|
|
512 if (l_offset == r_offset) {
|
|
513 return l_offset;
|
|
514 }
|
|
515 idx_t index = word_index(l_offset);
|
|
516 idx_t r_index = word_index(r_offset-1) + 1;
|
|
517 idx_t res_offset = l_offset;
|
|
518
|
|
519 // check bits including and to the _left_ of offset's position
|
|
520 idx_t pos = res_offset & (BitsPerWord - 1);
|
|
521 idx_t res = (map(index) >> pos) | left_n_bits((int)pos);
|
|
522
|
|
523 if (res != (uintptr_t)AllBits) {
|
|
524 // find the position of the 0-bit
|
|
525 for (; res & 1; res_offset++) {
|
|
526 res = res >> 1;
|
|
527 }
|
|
528 assert(res_offset >= l_offset, "just checking");
|
|
529 return MIN2(res_offset, r_offset);
|
|
530 }
|
|
531 // skip over all word length 1-bit runs
|
|
532 for (index++; index < r_index; index++) {
|
|
533 res = map(index);
|
|
534 if (res != (uintptr_t)AllBits) {
|
|
535 // found a 0, return the offset
|
|
536 for (res_offset = index << LogBitsPerWord; res & 1;
|
|
537 res_offset++) {
|
|
538 res = res >> 1;
|
|
539 }
|
|
540 assert(!(res & 1), "tautology; see loop condition");
|
|
541 assert(res_offset >= l_offset, "just checking");
|
|
542 return MIN2(res_offset, r_offset);
|
|
543 }
|
|
544 }
|
|
545 return r_offset;
|
|
546 }
|
|
547
|
|
548 #ifndef PRODUCT
|
|
549
|
|
550 void BitMap::print_on(outputStream* st) const {
|
|
551 tty->print("Bitmap(%d):", size());
|
|
552 for (idx_t index = 0; index < size(); index++) {
|
|
553 tty->print("%c", at(index) ? '1' : '0');
|
|
554 }
|
|
555 tty->cr();
|
|
556 }
|
|
557
|
|
558 #endif
|
|
559
|
|
560
|
|
561 BitMap2D::BitMap2D(uintptr_t* map, idx_t size_in_slots, idx_t bits_per_slot)
|
|
562 : _bits_per_slot(bits_per_slot)
|
|
563 , _map(map, size_in_slots * bits_per_slot)
|
|
564 {
|
|
565 }
|
|
566
|
|
567
|
|
568 BitMap2D::BitMap2D(idx_t size_in_slots, idx_t bits_per_slot)
|
|
569 : _bits_per_slot(bits_per_slot)
|
|
570 , _map(size_in_slots * bits_per_slot)
|
|
571 {
|
|
572 }
|