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Commit | Line | Data |
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427dcb4b JH |
1 | /* |
2 | * Copyright (C) 2005 Junio C Hamano | |
3 | */ | |
4 | #include "cache.h" | |
5 | #include "diff.h" | |
6 | #include "diffcore.h" | |
427dcb4b | 7 | |
25d5ea41 JH |
8 | /* Table of rename/copy destinations */ |
9 | ||
10 | static struct diff_rename_dst { | |
11 | struct diff_filespec *two; | |
12 | struct diff_filepair *pair; | |
13 | } *rename_dst; | |
14 | static int rename_dst_nr, rename_dst_alloc; | |
427dcb4b | 15 | |
25d5ea41 JH |
16 | static struct diff_rename_dst *locate_rename_dst(struct diff_filespec *two, |
17 | int insert_ok) | |
427dcb4b | 18 | { |
25d5ea41 JH |
19 | int first, last; |
20 | ||
21 | first = 0; | |
22 | last = rename_dst_nr; | |
23 | while (last > first) { | |
24 | int next = (last + first) >> 1; | |
25 | struct diff_rename_dst *dst = &(rename_dst[next]); | |
26 | int cmp = strcmp(two->path, dst->two->path); | |
27 | if (!cmp) | |
28 | return dst; | |
29 | if (cmp < 0) { | |
30 | last = next; | |
31 | continue; | |
32 | } | |
33 | first = next+1; | |
34 | } | |
35 | /* not found */ | |
36 | if (!insert_ok) | |
37 | return NULL; | |
38 | /* insert to make it at "first" */ | |
39 | if (rename_dst_alloc <= rename_dst_nr) { | |
40 | rename_dst_alloc = alloc_nr(rename_dst_alloc); | |
41 | rename_dst = xrealloc(rename_dst, | |
42 | rename_dst_alloc * sizeof(*rename_dst)); | |
43 | } | |
44 | rename_dst_nr++; | |
45 | if (first < rename_dst_nr) | |
46 | memmove(rename_dst + first + 1, rename_dst + first, | |
47 | (rename_dst_nr - first - 1) * sizeof(*rename_dst)); | |
5098bafb JH |
48 | rename_dst[first].two = alloc_filespec(two->path); |
49 | fill_filespec(rename_dst[first].two, two->sha1, two->mode); | |
25d5ea41 JH |
50 | rename_dst[first].pair = NULL; |
51 | return &(rename_dst[first]); | |
427dcb4b JH |
52 | } |
53 | ||
15d061b4 | 54 | /* Table of rename/copy src files */ |
25d5ea41 JH |
55 | static struct diff_rename_src { |
56 | struct diff_filespec *one; | |
6bac10d8 | 57 | unsigned src_path_left : 1; |
25d5ea41 JH |
58 | } *rename_src; |
59 | static int rename_src_nr, rename_src_alloc; | |
427dcb4b | 60 | |
15d061b4 | 61 | static struct diff_rename_src *register_rename_src(struct diff_filespec *one, |
6bac10d8 | 62 | int src_path_left) |
25d5ea41 JH |
63 | { |
64 | int first, last; | |
65 | ||
66 | first = 0; | |
67 | last = rename_src_nr; | |
68 | while (last > first) { | |
69 | int next = (last + first) >> 1; | |
70 | struct diff_rename_src *src = &(rename_src[next]); | |
71 | int cmp = strcmp(one->path, src->one->path); | |
72 | if (!cmp) | |
73 | return src; | |
74 | if (cmp < 0) { | |
75 | last = next; | |
76 | continue; | |
77 | } | |
78 | first = next+1; | |
79 | } | |
15d061b4 | 80 | |
25d5ea41 JH |
81 | /* insert to make it at "first" */ |
82 | if (rename_src_alloc <= rename_src_nr) { | |
83 | rename_src_alloc = alloc_nr(rename_src_alloc); | |
84 | rename_src = xrealloc(rename_src, | |
85 | rename_src_alloc * sizeof(*rename_src)); | |
427dcb4b | 86 | } |
25d5ea41 JH |
87 | rename_src_nr++; |
88 | if (first < rename_src_nr) | |
89 | memmove(rename_src + first + 1, rename_src + first, | |
90 | (rename_src_nr - first - 1) * sizeof(*rename_src)); | |
91 | rename_src[first].one = one; | |
6bac10d8 | 92 | rename_src[first].src_path_left = src_path_left; |
25d5ea41 | 93 | return &(rename_src[first]); |
427dcb4b JH |
94 | } |
95 | ||
96 | static int is_exact_match(struct diff_filespec *src, struct diff_filespec *dst) | |
97 | { | |
98 | if (src->sha1_valid && dst->sha1_valid && | |
99 | !memcmp(src->sha1, dst->sha1, 20)) | |
100 | return 1; | |
f0c6b2a2 JH |
101 | if (diff_populate_filespec(src, 1) || diff_populate_filespec(dst, 1)) |
102 | return 0; | |
103 | if (src->size != dst->size) | |
104 | return 0; | |
105 | if (diff_populate_filespec(src, 0) || diff_populate_filespec(dst, 0)) | |
427dcb4b JH |
106 | return 0; |
107 | if (src->size == dst->size && | |
108 | !memcmp(src->data, dst->data, src->size)) | |
109 | return 1; | |
110 | return 0; | |
111 | } | |
112 | ||
113 | struct diff_score { | |
25d5ea41 JH |
114 | int src; /* index in rename_src */ |
115 | int dst; /* index in rename_dst */ | |
427dcb4b | 116 | int score; |
427dcb4b JH |
117 | }; |
118 | ||
119 | static int estimate_similarity(struct diff_filespec *src, | |
120 | struct diff_filespec *dst, | |
121 | int minimum_score) | |
122 | { | |
123 | /* src points at a file that existed in the original tree (or | |
124 | * optionally a file in the destination tree) and dst points | |
125 | * at a newly created file. They may be quite similar, in which | |
126 | * case we want to say src is renamed to dst or src is copied into | |
127 | * dst, and then some edit has been applied to dst. | |
128 | * | |
129 | * Compare them and return how similar they are, representing | |
f0c6b2a2 JH |
130 | * the score as an integer between 0 and MAX_SCORE. |
131 | * | |
132 | * When there is an exact match, it is considered a better | |
133 | * match than anything else; the destination does not even | |
134 | * call into this function in that case. | |
427dcb4b | 135 | */ |
355e76a4 | 136 | unsigned long delta_size, base_size, src_copied, literal_added; |
75c660ac | 137 | unsigned long delta_limit; |
427dcb4b JH |
138 | int score; |
139 | ||
60896c7b JH |
140 | /* We deal only with regular files. Symlink renames are handled |
141 | * only when they are exact matches --- in other words, no edits | |
142 | * after renaming. | |
143 | */ | |
144 | if (!S_ISREG(src->mode) || !S_ISREG(dst->mode)) | |
145 | return 0; | |
146 | ||
427dcb4b JH |
147 | delta_size = ((src->size < dst->size) ? |
148 | (dst->size - src->size) : (src->size - dst->size)); | |
58b103f5 | 149 | base_size = ((src->size < dst->size) ? src->size : dst->size); |
427dcb4b | 150 | |
58b103f5 JH |
151 | /* We would not consider edits that change the file size so |
152 | * drastically. delta_size must be smaller than | |
cd1870ed | 153 | * (MAX_SCORE-minimum_score)/MAX_SCORE * min(src->size, dst->size). |
f0c6b2a2 | 154 | * |
58b103f5 JH |
155 | * Note that base_size == 0 case is handled here already |
156 | * and the final score computation below would not have a | |
157 | * divide-by-zero issue. | |
427dcb4b | 158 | */ |
cd1870ed | 159 | if (base_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE) |
427dcb4b JH |
160 | return 0; |
161 | ||
f0c6b2a2 JH |
162 | if (diff_populate_filespec(src, 0) || diff_populate_filespec(dst, 0)) |
163 | return 0; /* error but caught downstream */ | |
164 | ||
85976974 | 165 | |
65416758 JH |
166 | delta_limit = base_size * (MAX_SCORE-minimum_score) / MAX_SCORE; |
167 | if (diffcore_count_changes(src->data, src->size, | |
168 | dst->data, dst->size, | |
169 | delta_limit, | |
170 | &src_copied, &literal_added)) | |
85976974 | 171 | return 0; |
355e76a4 JH |
172 | |
173 | /* Extent of damage */ | |
174 | if (src->size + literal_added < src_copied) | |
175 | delta_size = 0; | |
176 | else | |
177 | delta_size = (src->size - src_copied) + literal_added; | |
427dcb4b | 178 | |
58b103f5 JH |
179 | /* |
180 | * Now we will give some score to it. 100% edit gets 0 points | |
181 | * and 0% edit gets MAX_SCORE points. | |
427dcb4b | 182 | */ |
58b103f5 | 183 | score = MAX_SCORE - (MAX_SCORE * delta_size / base_size); |
427dcb4b JH |
184 | if (score < 0) return 0; |
185 | if (MAX_SCORE < score) return MAX_SCORE; | |
186 | return score; | |
187 | } | |
188 | ||
5098bafb | 189 | static void record_rename_pair(int dst_index, int src_index, int score) |
427dcb4b | 190 | { |
25d5ea41 JH |
191 | struct diff_filespec *one, *two, *src, *dst; |
192 | struct diff_filepair *dp; | |
f7c1512a | 193 | |
25d5ea41 JH |
194 | if (rename_dst[dst_index].pair) |
195 | die("internal error: dst already matched."); | |
427dcb4b | 196 | |
25d5ea41 JH |
197 | src = rename_src[src_index].one; |
198 | one = alloc_filespec(src->path); | |
199 | fill_filespec(one, src->sha1, src->mode); | |
427dcb4b | 200 | |
25d5ea41 JH |
201 | dst = rename_dst[dst_index].two; |
202 | two = alloc_filespec(dst->path); | |
203 | fill_filespec(two, dst->sha1, dst->mode); | |
427dcb4b | 204 | |
5098bafb | 205 | dp = diff_queue(NULL, one, two); |
01c4e70f | 206 | dp->score = score; |
6bac10d8 | 207 | dp->source_stays = rename_src[src_index].src_path_left; |
25d5ea41 | 208 | rename_dst[dst_index].pair = dp; |
427dcb4b JH |
209 | } |
210 | ||
211 | /* | |
212 | * We sort the rename similarity matrix with the score, in descending | |
15d061b4 | 213 | * order (the most similar first). |
427dcb4b JH |
214 | */ |
215 | static int score_compare(const void *a_, const void *b_) | |
216 | { | |
217 | const struct diff_score *a = a_, *b = b_; | |
218 | return b->score - a->score; | |
219 | } | |
220 | ||
6bac10d8 JH |
221 | static int compute_stays(struct diff_queue_struct *q, |
222 | struct diff_filespec *one) | |
223 | { | |
224 | int i; | |
225 | for (i = 0; i < q->nr; i++) { | |
226 | struct diff_filepair *p = q->queue[i]; | |
227 | if (strcmp(one->path, p->two->path)) | |
228 | continue; | |
229 | if (DIFF_PAIR_RENAME(p)) { | |
230 | return 0; /* something else is renamed into this */ | |
231 | } | |
232 | } | |
233 | return 1; | |
234 | } | |
235 | ||
8082d8d3 | 236 | void diffcore_rename(struct diff_options *options) |
427dcb4b | 237 | { |
8082d8d3 JH |
238 | int detect_rename = options->detect_rename; |
239 | int minimum_score = options->rename_score; | |
240 | int rename_limit = options->rename_limit; | |
38c6f780 | 241 | struct diff_queue_struct *q = &diff_queued_diff; |
5098bafb | 242 | struct diff_queue_struct outq; |
427dcb4b | 243 | struct diff_score *mx; |
5098bafb | 244 | int i, j, rename_count; |
25d5ea41 | 245 | int num_create, num_src, dst_cnt; |
427dcb4b | 246 | |
26dee0ad | 247 | if (!minimum_score) |
f345b0a0 | 248 | minimum_score = DEFAULT_RENAME_SCORE; |
5098bafb | 249 | rename_count = 0; |
427dcb4b | 250 | |
427dcb4b | 251 | for (i = 0; i < q->nr; i++) { |
52e95789 | 252 | struct diff_filepair *p = q->queue[i]; |
81e50eab JH |
253 | if (!DIFF_FILE_VALID(p->one)) |
254 | if (!DIFF_FILE_VALID(p->two)) | |
60896c7b | 255 | continue; /* unmerged */ |
427dcb4b | 256 | else |
25d5ea41 | 257 | locate_rename_dst(p->two, 1); |
2210100a JH |
258 | else if (!DIFF_FILE_VALID(p->two)) { |
259 | /* If the source is a broken "delete", and | |
260 | * they did not really want to get broken, | |
261 | * that means the source actually stays. | |
262 | */ | |
263 | int stays = (p->broken_pair && !p->score); | |
264 | register_rename_src(p->one, stays); | |
265 | } | |
15d061b4 JH |
266 | else if (detect_rename == DIFF_DETECT_COPY) |
267 | register_rename_src(p->one, 1); | |
427dcb4b | 268 | } |
7d6fb370 | 269 | if (rename_dst_nr == 0 || rename_src_nr == 0 || |
3299c6f6 | 270 | (0 < rename_limit && rename_limit < rename_dst_nr)) |
427dcb4b JH |
271 | goto cleanup; /* nothing to do */ |
272 | ||
273 | /* We really want to cull the candidates list early | |
274 | * with cheap tests in order to avoid doing deltas. | |
427dcb4b | 275 | */ |
25d5ea41 JH |
276 | for (i = 0; i < rename_dst_nr; i++) { |
277 | struct diff_filespec *two = rename_dst[i].two; | |
278 | for (j = 0; j < rename_src_nr; j++) { | |
279 | struct diff_filespec *one = rename_src[j].one; | |
280 | if (!is_exact_match(one, two)) | |
281 | continue; | |
5098bafb JH |
282 | record_rename_pair(i, j, MAX_SCORE); |
283 | rename_count++; | |
25d5ea41 | 284 | break; /* we are done with this entry */ |
427dcb4b JH |
285 | } |
286 | } | |
427dcb4b JH |
287 | |
288 | /* Have we run out the created file pool? If so we can avoid | |
289 | * doing the delta matrix altogether. | |
290 | */ | |
5098bafb | 291 | if (rename_count == rename_dst_nr) |
15d061b4 | 292 | goto cleanup; |
427dcb4b | 293 | |
9f70b806 JH |
294 | if (minimum_score == MAX_SCORE) |
295 | goto cleanup; | |
296 | ||
5098bafb | 297 | num_create = (rename_dst_nr - rename_count); |
25d5ea41 | 298 | num_src = rename_src_nr; |
427dcb4b | 299 | mx = xmalloc(sizeof(*mx) * num_create * num_src); |
25d5ea41 | 300 | for (dst_cnt = i = 0; i < rename_dst_nr; i++) { |
427dcb4b | 301 | int base = dst_cnt * num_src; |
25d5ea41 JH |
302 | struct diff_filespec *two = rename_dst[i].two; |
303 | if (rename_dst[i].pair) | |
427dcb4b | 304 | continue; /* dealt with exact match already. */ |
25d5ea41 JH |
305 | for (j = 0; j < rename_src_nr; j++) { |
306 | struct diff_filespec *one = rename_src[j].one; | |
307 | struct diff_score *m = &mx[base+j]; | |
308 | m->src = j; | |
309 | m->dst = i; | |
310 | m->score = estimate_similarity(one, two, | |
311 | minimum_score); | |
427dcb4b JH |
312 | } |
313 | dst_cnt++; | |
314 | } | |
315 | /* cost matrix sorted by most to least similar pair */ | |
316 | qsort(mx, num_create * num_src, sizeof(*mx), score_compare); | |
317 | for (i = 0; i < num_create * num_src; i++) { | |
25d5ea41 JH |
318 | struct diff_rename_dst *dst = &rename_dst[mx[i].dst]; |
319 | if (dst->pair) | |
320 | continue; /* already done, either exact or fuzzy. */ | |
427dcb4b | 321 | if (mx[i].score < minimum_score) |
15d061b4 | 322 | break; /* there is no more usable pair. */ |
5098bafb JH |
323 | record_rename_pair(mx[i].dst, mx[i].src, mx[i].score); |
324 | rename_count++; | |
427dcb4b JH |
325 | } |
326 | free(mx); | |
427dcb4b | 327 | |
15d061b4 | 328 | cleanup: |
427dcb4b | 329 | /* At this point, we have found some renames and copies and they |
5098bafb | 330 | * are recorded in rename_dst. The original list is still in *q. |
427dcb4b | 331 | */ |
25d5ea41 JH |
332 | outq.queue = NULL; |
333 | outq.nr = outq.alloc = 0; | |
427dcb4b | 334 | for (i = 0; i < q->nr; i++) { |
25d5ea41 | 335 | struct diff_filepair *p = q->queue[i]; |
25d5ea41 JH |
336 | struct diff_filepair *pair_to_free = NULL; |
337 | ||
2cd68882 JH |
338 | if (!DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) { |
339 | /* | |
340 | * Creation | |
341 | * | |
342 | * We would output this create record if it has | |
343 | * not been turned into a rename/copy already. | |
344 | */ | |
345 | struct diff_rename_dst *dst = | |
346 | locate_rename_dst(p->two, 0); | |
347 | if (dst && dst->pair) { | |
25d5ea41 JH |
348 | diff_q(&outq, dst->pair); |
349 | pair_to_free = p; | |
350 | } | |
351 | else | |
2cd68882 JH |
352 | /* no matching rename/copy source, so |
353 | * record this as a creation. | |
25d5ea41 JH |
354 | */ |
355 | diff_q(&outq, p); | |
427dcb4b | 356 | } |
2cd68882 JH |
357 | else if (DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two)) { |
358 | /* | |
359 | * Deletion | |
360 | * | |
f345b0a0 JH |
361 | * We would output this delete record if: |
362 | * | |
363 | * (1) this is a broken delete and the counterpart | |
364 | * broken create remains in the output; or | |
5098bafb JH |
365 | * (2) this is not a broken delete, and rename_dst |
366 | * does not have a rename/copy to move p->one->path | |
367 | * out of existence. | |
f345b0a0 JH |
368 | * |
369 | * Otherwise, the counterpart broken create | |
370 | * has been turned into a rename-edit; or | |
371 | * delete did not have a matching create to | |
372 | * begin with. | |
2cd68882 | 373 | */ |
f345b0a0 JH |
374 | if (DIFF_PAIR_BROKEN(p)) { |
375 | /* broken delete */ | |
376 | struct diff_rename_dst *dst = | |
377 | locate_rename_dst(p->one, 0); | |
378 | if (dst && dst->pair) | |
379 | /* counterpart is now rename/copy */ | |
380 | pair_to_free = p; | |
381 | } | |
382 | else { | |
5098bafb JH |
383 | for (j = 0; j < rename_dst_nr; j++) { |
384 | if (!rename_dst[j].pair) | |
385 | continue; | |
386 | if (strcmp(rename_dst[j].pair-> | |
387 | one->path, | |
388 | p->one->path)) | |
389 | continue; | |
390 | break; | |
391 | } | |
392 | if (j < rename_dst_nr) | |
f345b0a0 JH |
393 | /* this path remains */ |
394 | pair_to_free = p; | |
395 | } | |
2cd68882 JH |
396 | |
397 | if (pair_to_free) | |
398 | ; | |
399 | else | |
400 | diff_q(&outq, p); | |
401 | } | |
25d5ea41 | 402 | else if (!diff_unmodified_pair(p)) |
15d061b4 | 403 | /* all the usual ones need to be kept */ |
25d5ea41 | 404 | diff_q(&outq, p); |
15d061b4 JH |
405 | else |
406 | /* no need to keep unmodified pairs */ | |
407 | pair_to_free = p; | |
408 | ||
226406f6 JH |
409 | if (pair_to_free) |
410 | diff_free_filepair(pair_to_free); | |
427dcb4b | 411 | } |
25d5ea41 | 412 | diff_debug_queue("done copying original", &outq); |
427dcb4b | 413 | |
25d5ea41 JH |
414 | free(q->queue); |
415 | *q = outq; | |
416 | diff_debug_queue("done collapsing", q); | |
427dcb4b | 417 | |
6bac10d8 JH |
418 | /* We need to see which rename source really stays here; |
419 | * earlier we only checked if the path is left in the result, | |
420 | * but even if a path remains in the result, if that is coming | |
421 | * from copying something else on top of it, then the original | |
422 | * source is lost and does not stay. | |
423 | */ | |
424 | for (i = 0; i < q->nr; i++) { | |
425 | struct diff_filepair *p = q->queue[i]; | |
426 | if (DIFF_PAIR_RENAME(p) && p->source_stays) { | |
427 | /* If one appears as the target of a rename-copy, | |
428 | * then mark p->source_stays = 0; otherwise | |
429 | * leave it as is. | |
430 | */ | |
431 | p->source_stays = compute_stays(q, p->one); | |
432 | } | |
433 | } | |
434 | ||
5098bafb JH |
435 | for (i = 0; i < rename_dst_nr; i++) { |
436 | diff_free_filespec_data(rename_dst[i].two); | |
437 | free(rename_dst[i].two); | |
438 | } | |
439 | ||
25d5ea41 JH |
440 | free(rename_dst); |
441 | rename_dst = NULL; | |
442 | rename_dst_nr = rename_dst_alloc = 0; | |
443 | free(rename_src); | |
444 | rename_src = NULL; | |
445 | rename_src_nr = rename_src_alloc = 0; | |
427dcb4b JH |
446 | return; |
447 | } |