annotate mercurial/bdiff.c @ 35350:82ee401135dd

py3: handle keyword arguments correctly in cmdutil.py Differential Revision: https://phab.mercurial-scm.org/D1626
author Pulkit Goyal <7895pulkit@gmail.com>
date Sun, 10 Dec 2017 04:45:10 +0530
parents 7201e3607d90
children cf2e2a7399bc
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1 /*
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2 bdiff.c - efficient binary diff extension for Mercurial
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3
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4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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5
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6 This software may be used and distributed according to the terms of
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7 the GNU General Public License, incorporated herein by reference.
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8
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9 Based roughly on Python difflib
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10 */
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11
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12 #include <limits.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15
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16 #include "bdiff.h"
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17 #include "bitmanipulation.h"
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18 #include "compat.h"
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19
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20 /* Hash implementation from diffutils */
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21 #define ROL(v, n) ((v) << (n) | (v) >> (sizeof(v) * CHAR_BIT - (n)))
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22 #define HASH(h, c) ((c) + ROL(h, 7))
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23
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24 struct pos {
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25 int pos, len;
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26 };
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27
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28 int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr)
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29 {
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30 unsigned hash;
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31 int i;
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32 const char *p, *b = a;
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33 const char *const plast = a + len - 1;
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34 struct bdiff_line *l;
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35
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36 /* count the lines */
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37 i = 1; /* extra line for sentinel */
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38 for (p = a; p < plast; p++)
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39 if (*p == '\n')
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40 i++;
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41 if (p == plast)
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42 i++;
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44 *lr = l = (struct bdiff_line *)malloc(sizeof(struct bdiff_line) * i);
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45 if (!l)
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46 return -1;
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47
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48 /* build the line array and calculate hashes */
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49 hash = 0;
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50 for (p = a; p < plast; p++) {
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51 hash = HASH(hash, *p);
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52
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53 if (*p == '\n') {
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54 l->hash = hash;
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55 hash = 0;
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56 l->len = p - b + 1;
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57 l->l = b;
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58 l->n = INT_MAX;
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59 l++;
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60 b = p + 1;
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61 }
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62 }
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63
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64 if (p == plast) {
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65 hash = HASH(hash, *p);
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66 l->hash = hash;
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67 l->len = p - b + 1;
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68 l->l = b;
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69 l->n = INT_MAX;
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70 l++;
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71 }
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72
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73 /* set up a sentinel */
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74 l->hash = 0;
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75 l->len = 0;
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76 l->l = a + len;
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77 return i - 1;
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78 }
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79
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80 static inline int cmp(struct bdiff_line *a, struct bdiff_line *b)
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81 {
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82 return a->hash != b->hash || a->len != b->len ||
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83 memcmp(a->l, b->l, a->len);
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84 }
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85
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86 static int equatelines(struct bdiff_line *a, int an, struct bdiff_line *b,
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87 int bn)
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88 {
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89 int i, j, buckets = 1, t, scale;
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90 struct pos *h = NULL;
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91
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92 /* build a hash table of the next highest power of 2 */
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93 while (buckets < bn + 1)
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94 buckets *= 2;
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95
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96 /* try to allocate a large hash table to avoid collisions */
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97 for (scale = 4; scale; scale /= 2) {
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98 h = (struct pos *)malloc(scale * buckets * sizeof(struct pos));
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99 if (h)
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100 break;
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101 }
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102
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103 if (!h)
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104 return 0;
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105
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106 buckets = buckets * scale - 1;
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107
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108 /* clear the hash table */
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109 for (i = 0; i <= buckets; i++) {
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110 h[i].pos = -1;
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111 h[i].len = 0;
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112 }
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113
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114 /* add lines to the hash table chains */
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115 for (i = 0; i < bn; i++) {
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116 /* find the equivalence class */
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117 for (j = b[i].hash & buckets; h[j].pos != -1;
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118 j = (j + 1) & buckets)
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119 if (!cmp(b + i, b + h[j].pos))
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120 break;
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121
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122 /* add to the head of the equivalence class */
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123 b[i].n = h[j].pos;
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124 b[i].e = j;
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125 h[j].pos = i;
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126 h[j].len++; /* keep track of popularity */
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127 }
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128
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129 /* compute popularity threshold */
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130 t = (bn >= 31000) ? bn / 1000 : 1000000 / (bn + 1);
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131
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132 /* match items in a to their equivalence class in b */
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133 for (i = 0; i < an; i++) {
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134 /* find the equivalence class */
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135 for (j = a[i].hash & buckets; h[j].pos != -1;
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136 j = (j + 1) & buckets)
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137 if (!cmp(a + i, b + h[j].pos))
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138 break;
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139
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140 a[i].e = j; /* use equivalence class for quick compare */
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141 if (h[j].len <= t)
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142 a[i].n = h[j].pos; /* point to head of match list */
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143 else
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144 a[i].n = -1; /* too popular */
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145 }
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146
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147 /* discard hash tables */
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148 free(h);
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149 return 1;
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150 }
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151
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152 static int longest_match(struct bdiff_line *a, struct bdiff_line *b,
34631
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153 struct pos *pos, int a1, int a2, int b1, int b2,
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154 int *omi, int *omj)
400
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155 {
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diff changeset
156 int mi = a1, mj = b1, mk = 0, i, j, k, half, bhalf;
29015
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157
87d4a6c5567e bdiff: further restrain potential quadratic performance
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parents: 29014
diff changeset
158 /* window our search on large regions to better bound
87d4a6c5567e bdiff: further restrain potential quadratic performance
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parents: 29014
diff changeset
159 worst-case performance. by choosing a window at the end, we
87d4a6c5567e bdiff: further restrain potential quadratic performance
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diff changeset
160 reduce skipping overhead on the b chains. */
87d4a6c5567e bdiff: further restrain potential quadratic performance
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diff changeset
161 if (a2 - a1 > 30000)
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162 a1 = a2 - 30000;
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diff changeset
163
30429
38ed54888617 bdiff: adjust criteria for getting optimal longest match in the A side middle
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diff changeset
164 half = (a1 + a2 - 1) / 2;
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165 bhalf = (b1 + b2 - 1) / 2;
400
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166
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167 for (i = a1; i < a2; i++) {
29013
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diff changeset
168 /* skip all lines in b after the current block */
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diff changeset
169 for (j = a[i].n; j >= b2; j = b[j].n)
400
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170 ;
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171
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172 /* loop through all lines match a[i] in b */
29013
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diff changeset
173 for (; j >= b1; j = b[j].n) {
400
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174 /* does this extend an earlier match? */
29322
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diff changeset
175 for (k = 1; j - k >= b1 && i - k >= a1; k++) {
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176 /* reached an earlier match? */
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diff changeset
177 if (pos[j - k].pos == i - k) {
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diff changeset
178 k += pos[j - k].len;
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diff changeset
179 break;
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diff changeset
180 }
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diff changeset
181 /* previous line mismatch? */
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diff changeset
182 if (a[i - k].e != b[j - k].e)
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diff changeset
183 break;
66dbdd3cc2b9 bdiff: extend matches across popular lines
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diff changeset
184 }
66dbdd3cc2b9 bdiff: extend matches across popular lines
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diff changeset
185
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186 pos[j].pos = i;
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187 pos[j].len = k;
400
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188
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diff changeset
189 /* best match so far? we prefer matches closer
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diff changeset
190 to the middle to balance recursion */
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diff changeset
191 if (k > mk) {
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diff changeset
192 /* a longer match */
400
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193 mi = i;
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194 mj = j;
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195 mk = k;
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diff changeset
196 } else if (k == mk) {
30433
96f2f50d923f bdiff: give slight preference to removing trailing lines
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diff changeset
197 if (i > mi && i <= half && j > b1) {
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diff changeset
198 /* same match but closer to half */
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diff changeset
199 mi = i;
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diff changeset
200 mj = j;
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diff changeset
201 } else if (i == mi && (mj > bhalf || i == a1)) {
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diff changeset
202 /* same i but best earlier j */
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diff changeset
203 mj = j;
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diff changeset
204 }
400
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205 }
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206 }
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diff changeset
207 }
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208
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diff changeset
209 if (mk) {
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210 mi = mi - mk + 1;
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211 mj = mj - mk + 1;
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212 }
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213
29323
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diff changeset
214 /* expand match to include subsequent popular lines */
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diff changeset
215 while (mi + mk < a2 && mj + mk < b2 && a[mi + mk].e == b[mj + mk].e)
400
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216 mk++;
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diff changeset
217
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diff changeset
218 *omi = mi;
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219 *omj = mj;
5341
458acf92b49e bdiff: use INT_MAX to avoid some inner loop comparisons
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diff changeset
220
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diff changeset
221 return mk;
400
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diff changeset
222 }
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diff changeset
223
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diff changeset
224 static struct bdiff_hunk *recurse(struct bdiff_line *a, struct bdiff_line *b,
34631
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diff changeset
225 struct pos *pos, int a1, int a2, int b1,
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diff changeset
226 int b2, struct bdiff_hunk *l)
400
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227 {
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228 int i, j, k;
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229
10500
e96597c8d0ea bdiff: do not use recursion / avoid stackoverflow (issue1940)
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parents: 10282
diff changeset
230 while (1) {
e96597c8d0ea bdiff: do not use recursion / avoid stackoverflow (issue1940)
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diff changeset
231 /* find the longest match in this chunk */
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diff changeset
232 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j);
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diff changeset
233 if (!k)
13089
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diff changeset
234 return l;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
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diff changeset
235
10500
e96597c8d0ea bdiff: do not use recursion / avoid stackoverflow (issue1940)
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parents: 10282
diff changeset
236 /* and recurse on the remaining chunks on either side */
13089
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diff changeset
237 l = recurse(a, b, pos, a1, i, b1, j, l);
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diff changeset
238 if (!l)
faee0ffbc24b bdiff: dynamically allocate hunks
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diff changeset
239 return NULL;
faee0ffbc24b bdiff: dynamically allocate hunks
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diff changeset
240
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diff changeset
241 l->next =
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diff changeset
242 (struct bdiff_hunk *)malloc(sizeof(struct bdiff_hunk));
13089
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diff changeset
243 if (!l->next)
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parents: 11364
diff changeset
244 return NULL;
faee0ffbc24b bdiff: dynamically allocate hunks
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diff changeset
245
faee0ffbc24b bdiff: dynamically allocate hunks
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diff changeset
246 l = l->next;
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parents: 11364
diff changeset
247 l->a1 = i;
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
248 l->a2 = i + k;
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
249 l->b1 = j;
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
250 l->b2 = j + k;
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
251 l->next = NULL;
faee0ffbc24b bdiff: dynamically allocate hunks
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diff changeset
252
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
253 /* tail-recursion didn't happen, so do equivalent iteration */
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parents: 10282
diff changeset
254 a1 = i + k;
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parents: 10282
diff changeset
255 b1 = j + k;
e96597c8d0ea bdiff: do not use recursion / avoid stackoverflow (issue1940)
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parents: 10282
diff changeset
256 }
400
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diff changeset
257 }
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diff changeset
258
34631
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parents: 34630
diff changeset
259 int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,
4dea82ee7945 bdiff: rewrap function prototypes per clang-format
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diff changeset
260 struct bdiff_hunk *base)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
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261 {
29540
4ce1fc91e30a bdiff: rename functions and structs to be amenable for later exporting
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parents: 29539
diff changeset
262 struct bdiff_hunk *curr;
474
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parents: 472
diff changeset
263 struct pos *pos;
13089
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
264 int t, count = 0;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
265
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
266 /* allocate and fill arrays */
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
267 t = equatelines(a, an, b, bn);
5571
f84bb2e1cc3a fix calloc(0, ...) issue
Jim Hague <jim.hague@acm.org>
parents: 5452
diff changeset
268 pos = (struct pos *)calloc(bn ? bn : 1, sizeof(struct pos));
13089
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diff changeset
269
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
270 if (pos && t) {
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
271 /* generate the matching block list */
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
272
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
273 curr = recurse(a, b, pos, 0, an, 0, bn, base);
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
274 if (!curr)
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
275 return -1;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
276
13089
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diff changeset
277 /* sentinel end hunk */
34630
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diff changeset
278 curr->next =
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diff changeset
279 (struct bdiff_hunk *)malloc(sizeof(struct bdiff_hunk));
13089
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diff changeset
280 if (!curr->next)
13090
c73745762f33 bdiff: Fix bogus NULL return
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diff changeset
281 return -1;
13089
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diff changeset
282 curr = curr->next;
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
283 curr->a1 = curr->a2 = an;
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
284 curr->b1 = curr->b2 = bn;
faee0ffbc24b bdiff: dynamically allocate hunks
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diff changeset
285 curr->next = NULL;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
286 }
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
287
474
b2ae8283d1a6 Minor speed improvements for bdiff
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parents: 472
diff changeset
288 free(pos);
7104
9514cbb6e4f6 bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 7036
diff changeset
289
7625
930a2be7e875 bdiff: add comment about normalization
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 7189
diff changeset
290 /* normalize the hunk list, try to push each hunk towards the end */
13089
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parents: 11364
diff changeset
291 for (curr = base->next; curr; curr = curr->next) {
29540
4ce1fc91e30a bdiff: rename functions and structs to be amenable for later exporting
Maciej Fijalkowski <fijall@gmail.com>
parents: 29539
diff changeset
292 struct bdiff_hunk *next = curr->next;
7104
9514cbb6e4f6 bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 7036
diff changeset
293
13089
faee0ffbc24b bdiff: dynamically allocate hunks
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parents: 11364
diff changeset
294 if (!next)
7104
9514cbb6e4f6 bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 7036
diff changeset
295 break;
9514cbb6e4f6 bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 7036
diff changeset
296
29010
e868d8ee7c8f bdiff: unify duplicate normalize loops
Matt Mackall <mpm@selenic.com>
parents: 19962
diff changeset
297 if (curr->a2 == next->a1 || curr->b2 == next->b1)
34630
38463bd96d21 bdiff: re-wrap lines per clang-format
Augie Fackler <augie@google.com>
parents: 34629
diff changeset
298 while (curr->a2 < an && curr->b2 < bn &&
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Augie Fackler <augie@google.com>
parents: 34629
diff changeset
299 next->a1 < next->a2 && next->b1 < next->b2 &&
38463bd96d21 bdiff: re-wrap lines per clang-format
Augie Fackler <augie@google.com>
parents: 34629
diff changeset
300 !cmp(a + curr->a2, b + curr->b2)) {
29011
8bcda4c76820 bdiff: fold in shift calculation in normalize
Matt Mackall <mpm@selenic.com>
parents: 29010
diff changeset
301 curr->a2++;
8bcda4c76820 bdiff: fold in shift calculation in normalize
Matt Mackall <mpm@selenic.com>
parents: 29010
diff changeset
302 next->a1++;
8bcda4c76820 bdiff: fold in shift calculation in normalize
Matt Mackall <mpm@selenic.com>
parents: 29010
diff changeset
303 curr->b2++;
8bcda4c76820 bdiff: fold in shift calculation in normalize
Matt Mackall <mpm@selenic.com>
parents: 29010
diff changeset
304 next->b1++;
8bcda4c76820 bdiff: fold in shift calculation in normalize
Matt Mackall <mpm@selenic.com>
parents: 29010
diff changeset
305 }
7104
9514cbb6e4f6 bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 7036
diff changeset
306 }
9514cbb6e4f6 bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 7036
diff changeset
307
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
308 for (curr = base->next; curr; curr = curr->next)
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
309 count++;
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
310 return count;
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
311 }
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
312
29541
9631ff5ebbeb bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
parents: 29540
diff changeset
313 void bdiff_freehunks(struct bdiff_hunk *l)
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
314 {
29540
4ce1fc91e30a bdiff: rename functions and structs to be amenable for later exporting
Maciej Fijalkowski <fijall@gmail.com>
parents: 29539
diff changeset
315 struct bdiff_hunk *n;
13089
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
316 for (; l; l = n) {
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
317 n = l->next;
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
318 free(l);
faee0ffbc24b bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents: 11364
diff changeset
319 }
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
320 }