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Commit | Line | Data |
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fff42755 VM |
1 | #include "cache.h" |
2 | #include "commit.h" | |
3 | #include "tag.h" | |
4 | #include "diff.h" | |
5 | #include "revision.h" | |
6 | #include "progress.h" | |
7 | #include "list-objects.h" | |
8 | #include "pack.h" | |
9 | #include "pack-bitmap.h" | |
10 | #include "pack-revindex.h" | |
11 | #include "pack-objects.h" | |
12 | ||
13 | /* | |
14 | * An entry on the bitmap index, representing the bitmap for a given | |
15 | * commit. | |
16 | */ | |
17 | struct stored_bitmap { | |
18 | unsigned char sha1[20]; | |
19 | struct ewah_bitmap *root; | |
20 | struct stored_bitmap *xor; | |
21 | int flags; | |
22 | }; | |
23 | ||
24 | /* | |
25 | * The currently active bitmap index. By design, repositories only have | |
26 | * a single bitmap index available (the index for the biggest packfile in | |
27 | * the repository), since bitmap indexes need full closure. | |
28 | * | |
29 | * If there is more than one bitmap index available (e.g. because of alternates), | |
30 | * the active bitmap index is the largest one. | |
31 | */ | |
32 | static struct bitmap_index { | |
33 | /* Packfile to which this bitmap index belongs to */ | |
34 | struct packed_git *pack; | |
35 | ||
36 | /* reverse index for the packfile */ | |
37 | struct pack_revindex *reverse_index; | |
38 | ||
39 | /* | |
40 | * Mark the first `reuse_objects` in the packfile as reused: | |
41 | * they will be sent as-is without using them for repacking | |
42 | * calculations | |
43 | */ | |
44 | uint32_t reuse_objects; | |
45 | ||
46 | /* mmapped buffer of the whole bitmap index */ | |
47 | unsigned char *map; | |
48 | size_t map_size; /* size of the mmaped buffer */ | |
49 | size_t map_pos; /* current position when loading the index */ | |
50 | ||
51 | /* | |
52 | * Type indexes. | |
53 | * | |
54 | * Each bitmap marks which objects in the packfile are of the given | |
55 | * type. This provides type information when yielding the objects from | |
56 | * the packfile during a walk, which allows for better delta bases. | |
57 | */ | |
58 | struct ewah_bitmap *commits; | |
59 | struct ewah_bitmap *trees; | |
60 | struct ewah_bitmap *blobs; | |
61 | struct ewah_bitmap *tags; | |
62 | ||
25143a54 | 63 | /* Map from SHA1 -> `stored_bitmap` for all the bitmapped commits */ |
fff42755 VM |
64 | khash_sha1 *bitmaps; |
65 | ||
66 | /* Number of bitmapped commits */ | |
67 | uint32_t entry_count; | |
68 | ||
ae4f07fb VM |
69 | /* Name-hash cache (or NULL if not present). */ |
70 | uint32_t *hashes; | |
71 | ||
fff42755 VM |
72 | /* |
73 | * Extended index. | |
74 | * | |
75 | * When trying to perform bitmap operations with objects that are not | |
76 | * packed in `pack`, these objects are added to this "fake index" and | |
77 | * are assumed to appear at the end of the packfile for all operations | |
78 | */ | |
79 | struct eindex { | |
80 | struct object **objects; | |
81 | uint32_t *hashes; | |
82 | uint32_t count, alloc; | |
83 | khash_sha1_pos *positions; | |
84 | } ext_index; | |
85 | ||
86 | /* Bitmap result of the last performed walk */ | |
87 | struct bitmap *result; | |
88 | ||
89 | /* Version of the bitmap index */ | |
90 | unsigned int version; | |
91 | ||
92 | unsigned loaded : 1; | |
93 | ||
94 | } bitmap_git; | |
95 | ||
96 | static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st) | |
97 | { | |
98 | struct ewah_bitmap *parent; | |
99 | struct ewah_bitmap *composed; | |
100 | ||
101 | if (st->xor == NULL) | |
102 | return st->root; | |
103 | ||
104 | composed = ewah_pool_new(); | |
105 | parent = lookup_stored_bitmap(st->xor); | |
106 | ewah_xor(st->root, parent, composed); | |
107 | ||
108 | ewah_pool_free(st->root); | |
109 | st->root = composed; | |
110 | st->xor = NULL; | |
111 | ||
112 | return composed; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Read a bitmap from the current read position on the mmaped | |
117 | * index, and increase the read position accordingly | |
118 | */ | |
119 | static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index) | |
120 | { | |
121 | struct ewah_bitmap *b = ewah_pool_new(); | |
122 | ||
123 | int bitmap_size = ewah_read_mmap(b, | |
124 | index->map + index->map_pos, | |
125 | index->map_size - index->map_pos); | |
126 | ||
127 | if (bitmap_size < 0) { | |
128 | error("Failed to load bitmap index (corrupted?)"); | |
129 | ewah_pool_free(b); | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | index->map_pos += bitmap_size; | |
134 | return b; | |
135 | } | |
136 | ||
137 | static int load_bitmap_header(struct bitmap_index *index) | |
138 | { | |
139 | struct bitmap_disk_header *header = (void *)index->map; | |
140 | ||
141 | if (index->map_size < sizeof(*header) + 20) | |
142 | return error("Corrupted bitmap index (missing header data)"); | |
143 | ||
144 | if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0) | |
145 | return error("Corrupted bitmap index file (wrong header)"); | |
146 | ||
147 | index->version = ntohs(header->version); | |
148 | if (index->version != 1) | |
149 | return error("Unsupported version for bitmap index file (%d)", index->version); | |
150 | ||
151 | /* Parse known bitmap format options */ | |
152 | { | |
153 | uint32_t flags = ntohs(header->options); | |
154 | ||
155 | if ((flags & BITMAP_OPT_FULL_DAG) == 0) | |
156 | return error("Unsupported options for bitmap index file " | |
157 | "(Git requires BITMAP_OPT_FULL_DAG)"); | |
ae4f07fb VM |
158 | |
159 | if (flags & BITMAP_OPT_HASH_CACHE) { | |
160 | unsigned char *end = index->map + index->map_size - 20; | |
161 | index->hashes = ((uint32_t *)end) - index->pack->num_objects; | |
162 | } | |
fff42755 VM |
163 | } |
164 | ||
165 | index->entry_count = ntohl(header->entry_count); | |
166 | index->map_pos += sizeof(*header); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static struct stored_bitmap *store_bitmap(struct bitmap_index *index, | |
171 | struct ewah_bitmap *root, | |
172 | const unsigned char *sha1, | |
173 | struct stored_bitmap *xor_with, | |
174 | int flags) | |
175 | { | |
176 | struct stored_bitmap *stored; | |
177 | khiter_t hash_pos; | |
178 | int ret; | |
179 | ||
180 | stored = xmalloc(sizeof(struct stored_bitmap)); | |
181 | stored->root = root; | |
182 | stored->xor = xor_with; | |
183 | stored->flags = flags; | |
184 | hashcpy(stored->sha1, sha1); | |
185 | ||
186 | hash_pos = kh_put_sha1(index->bitmaps, stored->sha1, &ret); | |
187 | ||
188 | /* a 0 return code means the insertion succeeded with no changes, | |
189 | * because the SHA1 already existed on the map. this is bad, there | |
190 | * shouldn't be duplicated commits in the index */ | |
191 | if (ret == 0) { | |
192 | error("Duplicate entry in bitmap index: %s", sha1_to_hex(sha1)); | |
193 | return NULL; | |
194 | } | |
195 | ||
196 | kh_value(index->bitmaps, hash_pos) = stored; | |
197 | return stored; | |
198 | } | |
199 | ||
b5007211 KB |
200 | static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos) |
201 | { | |
202 | uint32_t result = get_be32(buffer + *pos); | |
203 | (*pos) += sizeof(result); | |
204 | return result; | |
205 | } | |
206 | ||
207 | static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos) | |
208 | { | |
209 | return buffer[(*pos)++]; | |
210 | } | |
211 | ||
599dc766 RS |
212 | #define MAX_XOR_OFFSET 160 |
213 | ||
fff42755 VM |
214 | static int load_bitmap_entries_v1(struct bitmap_index *index) |
215 | { | |
fff42755 | 216 | uint32_t i; |
599dc766 | 217 | struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL }; |
fff42755 VM |
218 | |
219 | for (i = 0; i < index->entry_count; ++i) { | |
220 | int xor_offset, flags; | |
221 | struct ewah_bitmap *bitmap = NULL; | |
222 | struct stored_bitmap *xor_bitmap = NULL; | |
223 | uint32_t commit_idx_pos; | |
224 | const unsigned char *sha1; | |
225 | ||
b5007211 KB |
226 | commit_idx_pos = read_be32(index->map, &index->map_pos); |
227 | xor_offset = read_u8(index->map, &index->map_pos); | |
228 | flags = read_u8(index->map, &index->map_pos); | |
fff42755 | 229 | |
fff42755 VM |
230 | sha1 = nth_packed_object_sha1(index->pack, commit_idx_pos); |
231 | ||
fff42755 VM |
232 | bitmap = read_bitmap_1(index); |
233 | if (!bitmap) | |
234 | return -1; | |
235 | ||
236 | if (xor_offset > MAX_XOR_OFFSET || xor_offset > i) | |
237 | return error("Corrupted bitmap pack index"); | |
238 | ||
239 | if (xor_offset > 0) { | |
240 | xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET]; | |
241 | ||
242 | if (xor_bitmap == NULL) | |
243 | return error("Invalid XOR offset in bitmap pack index"); | |
244 | } | |
245 | ||
246 | recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap( | |
247 | index, bitmap, sha1, xor_bitmap, flags); | |
248 | } | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
cb468050 JH |
253 | static char *pack_bitmap_filename(struct packed_git *p) |
254 | { | |
255 | char *idx_name; | |
256 | int len; | |
257 | ||
258 | len = strlen(p->pack_name) - strlen(".pack"); | |
259 | idx_name = xmalloc(len + strlen(".bitmap") + 1); | |
260 | ||
261 | memcpy(idx_name, p->pack_name, len); | |
262 | memcpy(idx_name + len, ".bitmap", strlen(".bitmap") + 1); | |
263 | ||
264 | return idx_name; | |
265 | } | |
266 | ||
fff42755 VM |
267 | static int open_pack_bitmap_1(struct packed_git *packfile) |
268 | { | |
269 | int fd; | |
270 | struct stat st; | |
271 | char *idx_name; | |
272 | ||
273 | if (open_pack_index(packfile)) | |
274 | return -1; | |
275 | ||
276 | idx_name = pack_bitmap_filename(packfile); | |
277 | fd = git_open_noatime(idx_name); | |
278 | free(idx_name); | |
279 | ||
280 | if (fd < 0) | |
281 | return -1; | |
282 | ||
283 | if (fstat(fd, &st)) { | |
284 | close(fd); | |
285 | return -1; | |
286 | } | |
287 | ||
288 | if (bitmap_git.pack) { | |
289 | warning("ignoring extra bitmap file: %s", packfile->pack_name); | |
290 | close(fd); | |
291 | return -1; | |
292 | } | |
293 | ||
294 | bitmap_git.pack = packfile; | |
295 | bitmap_git.map_size = xsize_t(st.st_size); | |
296 | bitmap_git.map = xmmap(NULL, bitmap_git.map_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
297 | bitmap_git.map_pos = 0; | |
298 | close(fd); | |
299 | ||
300 | if (load_bitmap_header(&bitmap_git) < 0) { | |
301 | munmap(bitmap_git.map, bitmap_git.map_size); | |
302 | bitmap_git.map = NULL; | |
303 | bitmap_git.map_size = 0; | |
304 | return -1; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static int load_pack_bitmap(void) | |
311 | { | |
312 | assert(bitmap_git.map && !bitmap_git.loaded); | |
313 | ||
314 | bitmap_git.bitmaps = kh_init_sha1(); | |
315 | bitmap_git.ext_index.positions = kh_init_sha1_pos(); | |
316 | bitmap_git.reverse_index = revindex_for_pack(bitmap_git.pack); | |
317 | ||
318 | if (!(bitmap_git.commits = read_bitmap_1(&bitmap_git)) || | |
319 | !(bitmap_git.trees = read_bitmap_1(&bitmap_git)) || | |
320 | !(bitmap_git.blobs = read_bitmap_1(&bitmap_git)) || | |
321 | !(bitmap_git.tags = read_bitmap_1(&bitmap_git))) | |
322 | goto failed; | |
323 | ||
324 | if (load_bitmap_entries_v1(&bitmap_git) < 0) | |
325 | goto failed; | |
326 | ||
327 | bitmap_git.loaded = 1; | |
328 | return 0; | |
329 | ||
330 | failed: | |
331 | munmap(bitmap_git.map, bitmap_git.map_size); | |
332 | bitmap_git.map = NULL; | |
333 | bitmap_git.map_size = 0; | |
334 | return -1; | |
335 | } | |
336 | ||
fff42755 VM |
337 | static int open_pack_bitmap(void) |
338 | { | |
339 | struct packed_git *p; | |
340 | int ret = -1; | |
341 | ||
342 | assert(!bitmap_git.map && !bitmap_git.loaded); | |
343 | ||
344 | prepare_packed_git(); | |
345 | for (p = packed_git; p; p = p->next) { | |
346 | if (open_pack_bitmap_1(p) == 0) | |
347 | ret = 0; | |
348 | } | |
349 | ||
350 | return ret; | |
351 | } | |
352 | ||
353 | int prepare_bitmap_git(void) | |
354 | { | |
355 | if (bitmap_git.loaded) | |
356 | return 0; | |
357 | ||
358 | if (!open_pack_bitmap()) | |
359 | return load_pack_bitmap(); | |
360 | ||
361 | return -1; | |
362 | } | |
363 | ||
364 | struct include_data { | |
365 | struct bitmap *base; | |
366 | struct bitmap *seen; | |
367 | }; | |
368 | ||
369 | static inline int bitmap_position_extended(const unsigned char *sha1) | |
370 | { | |
371 | khash_sha1_pos *positions = bitmap_git.ext_index.positions; | |
372 | khiter_t pos = kh_get_sha1_pos(positions, sha1); | |
373 | ||
374 | if (pos < kh_end(positions)) { | |
375 | int bitmap_pos = kh_value(positions, pos); | |
376 | return bitmap_pos + bitmap_git.pack->num_objects; | |
377 | } | |
378 | ||
379 | return -1; | |
380 | } | |
381 | ||
382 | static inline int bitmap_position_packfile(const unsigned char *sha1) | |
383 | { | |
384 | off_t offset = find_pack_entry_one(sha1, bitmap_git.pack); | |
385 | if (!offset) | |
386 | return -1; | |
387 | ||
388 | return find_revindex_position(bitmap_git.reverse_index, offset); | |
389 | } | |
390 | ||
391 | static int bitmap_position(const unsigned char *sha1) | |
392 | { | |
393 | int pos = bitmap_position_packfile(sha1); | |
394 | return (pos >= 0) ? pos : bitmap_position_extended(sha1); | |
395 | } | |
396 | ||
397 | static int ext_index_add_object(struct object *object, const char *name) | |
398 | { | |
399 | struct eindex *eindex = &bitmap_git.ext_index; | |
400 | ||
401 | khiter_t hash_pos; | |
402 | int hash_ret; | |
403 | int bitmap_pos; | |
404 | ||
405 | hash_pos = kh_put_sha1_pos(eindex->positions, object->sha1, &hash_ret); | |
406 | if (hash_ret > 0) { | |
407 | if (eindex->count >= eindex->alloc) { | |
408 | eindex->alloc = (eindex->alloc + 16) * 3 / 2; | |
2756ca43 RS |
409 | REALLOC_ARRAY(eindex->objects, eindex->alloc); |
410 | REALLOC_ARRAY(eindex->hashes, eindex->alloc); | |
fff42755 VM |
411 | } |
412 | ||
413 | bitmap_pos = eindex->count; | |
414 | eindex->objects[eindex->count] = object; | |
415 | eindex->hashes[eindex->count] = pack_name_hash(name); | |
416 | kh_value(eindex->positions, hash_pos) = bitmap_pos; | |
417 | eindex->count++; | |
418 | } else { | |
419 | bitmap_pos = kh_value(eindex->positions, hash_pos); | |
420 | } | |
421 | ||
422 | return bitmap_pos + bitmap_git.pack->num_objects; | |
423 | } | |
424 | ||
425 | static void show_object(struct object *object, const struct name_path *path, | |
426 | const char *last, void *data) | |
427 | { | |
428 | struct bitmap *base = data; | |
429 | int bitmap_pos; | |
430 | ||
431 | bitmap_pos = bitmap_position(object->sha1); | |
432 | ||
433 | if (bitmap_pos < 0) { | |
434 | char *name = path_name(path, last); | |
435 | bitmap_pos = ext_index_add_object(object, name); | |
436 | free(name); | |
437 | } | |
438 | ||
439 | bitmap_set(base, bitmap_pos); | |
440 | } | |
441 | ||
442 | static void show_commit(struct commit *commit, void *data) | |
443 | { | |
444 | } | |
445 | ||
446 | static int add_to_include_set(struct include_data *data, | |
447 | const unsigned char *sha1, | |
448 | int bitmap_pos) | |
449 | { | |
450 | khiter_t hash_pos; | |
451 | ||
452 | if (data->seen && bitmap_get(data->seen, bitmap_pos)) | |
453 | return 0; | |
454 | ||
455 | if (bitmap_get(data->base, bitmap_pos)) | |
456 | return 0; | |
457 | ||
458 | hash_pos = kh_get_sha1(bitmap_git.bitmaps, sha1); | |
459 | if (hash_pos < kh_end(bitmap_git.bitmaps)) { | |
460 | struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, hash_pos); | |
461 | bitmap_or_ewah(data->base, lookup_stored_bitmap(st)); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | bitmap_set(data->base, bitmap_pos); | |
466 | return 1; | |
467 | } | |
468 | ||
469 | static int should_include(struct commit *commit, void *_data) | |
470 | { | |
471 | struct include_data *data = _data; | |
472 | int bitmap_pos; | |
473 | ||
474 | bitmap_pos = bitmap_position(commit->object.sha1); | |
475 | if (bitmap_pos < 0) | |
476 | bitmap_pos = ext_index_add_object((struct object *)commit, NULL); | |
477 | ||
478 | if (!add_to_include_set(data, commit->object.sha1, bitmap_pos)) { | |
479 | struct commit_list *parent = commit->parents; | |
480 | ||
481 | while (parent) { | |
482 | parent->item->object.flags |= SEEN; | |
483 | parent = parent->next; | |
484 | } | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | return 1; | |
490 | } | |
491 | ||
492 | static struct bitmap *find_objects(struct rev_info *revs, | |
493 | struct object_list *roots, | |
494 | struct bitmap *seen) | |
495 | { | |
496 | struct bitmap *base = NULL; | |
497 | int needs_walk = 0; | |
498 | ||
499 | struct object_list *not_mapped = NULL; | |
500 | ||
501 | /* | |
502 | * Go through all the roots for the walk. The ones that have bitmaps | |
503 | * on the bitmap index will be `or`ed together to form an initial | |
504 | * global reachability analysis. | |
505 | * | |
506 | * The ones without bitmaps in the index will be stored in the | |
507 | * `not_mapped_list` for further processing. | |
508 | */ | |
509 | while (roots) { | |
510 | struct object *object = roots->item; | |
511 | roots = roots->next; | |
512 | ||
513 | if (object->type == OBJ_COMMIT) { | |
514 | khiter_t pos = kh_get_sha1(bitmap_git.bitmaps, object->sha1); | |
515 | ||
516 | if (pos < kh_end(bitmap_git.bitmaps)) { | |
517 | struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, pos); | |
518 | struct ewah_bitmap *or_with = lookup_stored_bitmap(st); | |
519 | ||
520 | if (base == NULL) | |
521 | base = ewah_to_bitmap(or_with); | |
522 | else | |
523 | bitmap_or_ewah(base, or_with); | |
524 | ||
525 | object->flags |= SEEN; | |
526 | continue; | |
527 | } | |
528 | } | |
529 | ||
530 | object_list_insert(object, ¬_mapped); | |
531 | } | |
532 | ||
533 | /* | |
534 | * Best case scenario: We found bitmaps for all the roots, | |
535 | * so the resulting `or` bitmap has the full reachability analysis | |
536 | */ | |
537 | if (not_mapped == NULL) | |
538 | return base; | |
539 | ||
540 | roots = not_mapped; | |
541 | ||
542 | /* | |
543 | * Let's iterate through all the roots that don't have bitmaps to | |
544 | * check if we can determine them to be reachable from the existing | |
545 | * global bitmap. | |
546 | * | |
547 | * If we cannot find them in the existing global bitmap, we'll need | |
548 | * to push them to an actual walk and run it until we can confirm | |
549 | * they are reachable | |
550 | */ | |
551 | while (roots) { | |
552 | struct object *object = roots->item; | |
553 | int pos; | |
554 | ||
555 | roots = roots->next; | |
556 | pos = bitmap_position(object->sha1); | |
557 | ||
558 | if (pos < 0 || base == NULL || !bitmap_get(base, pos)) { | |
559 | object->flags &= ~UNINTERESTING; | |
560 | add_pending_object(revs, object, ""); | |
561 | needs_walk = 1; | |
562 | } else { | |
563 | object->flags |= SEEN; | |
564 | } | |
565 | } | |
566 | ||
567 | if (needs_walk) { | |
568 | struct include_data incdata; | |
569 | ||
570 | if (base == NULL) | |
571 | base = bitmap_new(); | |
572 | ||
573 | incdata.base = base; | |
574 | incdata.seen = seen; | |
575 | ||
576 | revs->include_check = should_include; | |
577 | revs->include_check_data = &incdata; | |
578 | ||
579 | if (prepare_revision_walk(revs)) | |
580 | die("revision walk setup failed"); | |
581 | ||
582 | traverse_commit_list(revs, show_commit, show_object, base); | |
583 | } | |
584 | ||
585 | return base; | |
586 | } | |
587 | ||
588 | static void show_extended_objects(struct bitmap *objects, | |
589 | show_reachable_fn show_reach) | |
590 | { | |
591 | struct eindex *eindex = &bitmap_git.ext_index; | |
592 | uint32_t i; | |
593 | ||
594 | for (i = 0; i < eindex->count; ++i) { | |
595 | struct object *obj; | |
596 | ||
597 | if (!bitmap_get(objects, bitmap_git.pack->num_objects + i)) | |
598 | continue; | |
599 | ||
600 | obj = eindex->objects[i]; | |
601 | show_reach(obj->sha1, obj->type, 0, eindex->hashes[i], NULL, 0); | |
602 | } | |
603 | } | |
604 | ||
605 | static void show_objects_for_type( | |
606 | struct bitmap *objects, | |
607 | struct ewah_bitmap *type_filter, | |
608 | enum object_type object_type, | |
609 | show_reachable_fn show_reach) | |
610 | { | |
611 | size_t pos = 0, i = 0; | |
612 | uint32_t offset; | |
613 | ||
614 | struct ewah_iterator it; | |
615 | eword_t filter; | |
616 | ||
617 | if (bitmap_git.reuse_objects == bitmap_git.pack->num_objects) | |
618 | return; | |
619 | ||
620 | ewah_iterator_init(&it, type_filter); | |
621 | ||
622 | while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) { | |
623 | eword_t word = objects->words[i] & filter; | |
624 | ||
34b935c0 | 625 | for (offset = 0; offset < BITS_IN_EWORD; ++offset) { |
fff42755 VM |
626 | const unsigned char *sha1; |
627 | struct revindex_entry *entry; | |
628 | uint32_t hash = 0; | |
629 | ||
630 | if ((word >> offset) == 0) | |
631 | break; | |
632 | ||
633 | offset += ewah_bit_ctz64(word >> offset); | |
634 | ||
635 | if (pos + offset < bitmap_git.reuse_objects) | |
636 | continue; | |
637 | ||
638 | entry = &bitmap_git.reverse_index->revindex[pos + offset]; | |
639 | sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr); | |
640 | ||
ae4f07fb VM |
641 | if (bitmap_git.hashes) |
642 | hash = ntohl(bitmap_git.hashes[entry->nr]); | |
643 | ||
fff42755 VM |
644 | show_reach(sha1, object_type, 0, hash, bitmap_git.pack, entry->offset); |
645 | } | |
646 | ||
34b935c0 | 647 | pos += BITS_IN_EWORD; |
fff42755 VM |
648 | i++; |
649 | } | |
650 | } | |
651 | ||
652 | static int in_bitmapped_pack(struct object_list *roots) | |
653 | { | |
654 | while (roots) { | |
655 | struct object *object = roots->item; | |
656 | roots = roots->next; | |
657 | ||
658 | if (find_pack_entry_one(object->sha1, bitmap_git.pack) > 0) | |
659 | return 1; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | int prepare_bitmap_walk(struct rev_info *revs) | |
666 | { | |
667 | unsigned int i; | |
668 | unsigned int pending_nr = revs->pending.nr; | |
669 | struct object_array_entry *pending_e = revs->pending.objects; | |
670 | ||
671 | struct object_list *wants = NULL; | |
672 | struct object_list *haves = NULL; | |
673 | ||
674 | struct bitmap *wants_bitmap = NULL; | |
675 | struct bitmap *haves_bitmap = NULL; | |
676 | ||
677 | if (!bitmap_git.loaded) { | |
678 | /* try to open a bitmapped pack, but don't parse it yet | |
679 | * because we may not need to use it */ | |
680 | if (open_pack_bitmap() < 0) | |
681 | return -1; | |
682 | } | |
683 | ||
684 | for (i = 0; i < pending_nr; ++i) { | |
685 | struct object *object = pending_e[i].item; | |
686 | ||
687 | if (object->type == OBJ_NONE) | |
688 | parse_object_or_die(object->sha1, NULL); | |
689 | ||
690 | while (object->type == OBJ_TAG) { | |
691 | struct tag *tag = (struct tag *) object; | |
692 | ||
693 | if (object->flags & UNINTERESTING) | |
694 | object_list_insert(object, &haves); | |
695 | else | |
696 | object_list_insert(object, &wants); | |
697 | ||
698 | if (!tag->tagged) | |
699 | die("bad tag"); | |
700 | object = parse_object_or_die(tag->tagged->sha1, NULL); | |
701 | } | |
702 | ||
703 | if (object->flags & UNINTERESTING) | |
704 | object_list_insert(object, &haves); | |
705 | else | |
706 | object_list_insert(object, &wants); | |
707 | } | |
708 | ||
709 | /* | |
710 | * if we have a HAVES list, but none of those haves is contained | |
711 | * in the packfile that has a bitmap, we don't have anything to | |
712 | * optimize here | |
713 | */ | |
714 | if (haves && !in_bitmapped_pack(haves)) | |
715 | return -1; | |
716 | ||
717 | /* if we don't want anything, we're done here */ | |
718 | if (!wants) | |
719 | return -1; | |
720 | ||
721 | /* | |
722 | * now we're going to use bitmaps, so load the actual bitmap entries | |
723 | * from disk. this is the point of no return; after this the rev_list | |
724 | * becomes invalidated and we must perform the revwalk through bitmaps | |
725 | */ | |
726 | if (!bitmap_git.loaded && load_pack_bitmap() < 0) | |
727 | return -1; | |
728 | ||
729 | revs->pending.nr = 0; | |
730 | revs->pending.alloc = 0; | |
731 | revs->pending.objects = NULL; | |
732 | ||
733 | if (haves) { | |
2db1a43f | 734 | revs->ignore_missing_links = 1; |
fff42755 VM |
735 | haves_bitmap = find_objects(revs, haves, NULL); |
736 | reset_revision_walk(); | |
2db1a43f | 737 | revs->ignore_missing_links = 0; |
fff42755 VM |
738 | |
739 | if (haves_bitmap == NULL) | |
740 | die("BUG: failed to perform bitmap walk"); | |
741 | } | |
742 | ||
743 | wants_bitmap = find_objects(revs, wants, haves_bitmap); | |
744 | ||
745 | if (!wants_bitmap) | |
746 | die("BUG: failed to perform bitmap walk"); | |
747 | ||
748 | if (haves_bitmap) | |
749 | bitmap_and_not(wants_bitmap, haves_bitmap); | |
750 | ||
751 | bitmap_git.result = wants_bitmap; | |
752 | ||
753 | bitmap_free(haves_bitmap); | |
754 | return 0; | |
755 | } | |
756 | ||
757 | int reuse_partial_packfile_from_bitmap(struct packed_git **packfile, | |
758 | uint32_t *entries, | |
759 | off_t *up_to) | |
760 | { | |
761 | /* | |
762 | * Reuse the packfile content if we need more than | |
763 | * 90% of its objects | |
764 | */ | |
765 | static const double REUSE_PERCENT = 0.9; | |
766 | ||
767 | struct bitmap *result = bitmap_git.result; | |
768 | uint32_t reuse_threshold; | |
769 | uint32_t i, reuse_objects = 0; | |
770 | ||
771 | assert(result); | |
772 | ||
773 | for (i = 0; i < result->word_alloc; ++i) { | |
774 | if (result->words[i] != (eword_t)~0) { | |
775 | reuse_objects += ewah_bit_ctz64(~result->words[i]); | |
776 | break; | |
777 | } | |
778 | ||
34b935c0 | 779 | reuse_objects += BITS_IN_EWORD; |
fff42755 VM |
780 | } |
781 | ||
782 | #ifdef GIT_BITMAP_DEBUG | |
783 | { | |
784 | const unsigned char *sha1; | |
785 | struct revindex_entry *entry; | |
786 | ||
787 | entry = &bitmap_git.reverse_index->revindex[reuse_objects]; | |
788 | sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr); | |
789 | ||
790 | fprintf(stderr, "Failed to reuse at %d (%016llx)\n", | |
791 | reuse_objects, result->words[i]); | |
792 | fprintf(stderr, " %s\n", sha1_to_hex(sha1)); | |
793 | } | |
794 | #endif | |
795 | ||
796 | if (!reuse_objects) | |
797 | return -1; | |
798 | ||
799 | if (reuse_objects >= bitmap_git.pack->num_objects) { | |
800 | bitmap_git.reuse_objects = *entries = bitmap_git.pack->num_objects; | |
801 | *up_to = -1; /* reuse the full pack */ | |
802 | *packfile = bitmap_git.pack; | |
803 | return 0; | |
804 | } | |
805 | ||
806 | reuse_threshold = bitmap_popcount(bitmap_git.result) * REUSE_PERCENT; | |
807 | ||
808 | if (reuse_objects < reuse_threshold) | |
809 | return -1; | |
810 | ||
811 | bitmap_git.reuse_objects = *entries = reuse_objects; | |
812 | *up_to = bitmap_git.reverse_index->revindex[reuse_objects].offset; | |
813 | *packfile = bitmap_git.pack; | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | void traverse_bitmap_commit_list(show_reachable_fn show_reachable) | |
819 | { | |
820 | assert(bitmap_git.result); | |
821 | ||
822 | show_objects_for_type(bitmap_git.result, bitmap_git.commits, | |
823 | OBJ_COMMIT, show_reachable); | |
824 | show_objects_for_type(bitmap_git.result, bitmap_git.trees, | |
825 | OBJ_TREE, show_reachable); | |
826 | show_objects_for_type(bitmap_git.result, bitmap_git.blobs, | |
827 | OBJ_BLOB, show_reachable); | |
828 | show_objects_for_type(bitmap_git.result, bitmap_git.tags, | |
829 | OBJ_TAG, show_reachable); | |
830 | ||
831 | show_extended_objects(bitmap_git.result, show_reachable); | |
832 | ||
833 | bitmap_free(bitmap_git.result); | |
834 | bitmap_git.result = NULL; | |
835 | } | |
836 | ||
837 | static uint32_t count_object_type(struct bitmap *objects, | |
838 | enum object_type type) | |
839 | { | |
840 | struct eindex *eindex = &bitmap_git.ext_index; | |
841 | ||
842 | uint32_t i = 0, count = 0; | |
843 | struct ewah_iterator it; | |
844 | eword_t filter; | |
845 | ||
846 | switch (type) { | |
847 | case OBJ_COMMIT: | |
848 | ewah_iterator_init(&it, bitmap_git.commits); | |
849 | break; | |
850 | ||
851 | case OBJ_TREE: | |
852 | ewah_iterator_init(&it, bitmap_git.trees); | |
853 | break; | |
854 | ||
855 | case OBJ_BLOB: | |
856 | ewah_iterator_init(&it, bitmap_git.blobs); | |
857 | break; | |
858 | ||
859 | case OBJ_TAG: | |
860 | ewah_iterator_init(&it, bitmap_git.tags); | |
861 | break; | |
862 | ||
863 | default: | |
864 | return 0; | |
865 | } | |
866 | ||
867 | while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) { | |
868 | eword_t word = objects->words[i++] & filter; | |
869 | count += ewah_bit_popcount64(word); | |
870 | } | |
871 | ||
872 | for (i = 0; i < eindex->count; ++i) { | |
873 | if (eindex->objects[i]->type == type && | |
874 | bitmap_get(objects, bitmap_git.pack->num_objects + i)) | |
875 | count++; | |
876 | } | |
877 | ||
878 | return count; | |
879 | } | |
880 | ||
881 | void count_bitmap_commit_list(uint32_t *commits, uint32_t *trees, | |
882 | uint32_t *blobs, uint32_t *tags) | |
883 | { | |
884 | assert(bitmap_git.result); | |
885 | ||
886 | if (commits) | |
887 | *commits = count_object_type(bitmap_git.result, OBJ_COMMIT); | |
888 | ||
889 | if (trees) | |
890 | *trees = count_object_type(bitmap_git.result, OBJ_TREE); | |
891 | ||
892 | if (blobs) | |
893 | *blobs = count_object_type(bitmap_git.result, OBJ_BLOB); | |
894 | ||
895 | if (tags) | |
896 | *tags = count_object_type(bitmap_git.result, OBJ_TAG); | |
897 | } | |
898 | ||
899 | struct bitmap_test_data { | |
900 | struct bitmap *base; | |
901 | struct progress *prg; | |
902 | size_t seen; | |
903 | }; | |
904 | ||
905 | static void test_show_object(struct object *object, | |
906 | const struct name_path *path, | |
907 | const char *last, void *data) | |
908 | { | |
909 | struct bitmap_test_data *tdata = data; | |
910 | int bitmap_pos; | |
911 | ||
912 | bitmap_pos = bitmap_position(object->sha1); | |
913 | if (bitmap_pos < 0) | |
914 | die("Object not in bitmap: %s\n", sha1_to_hex(object->sha1)); | |
915 | ||
916 | bitmap_set(tdata->base, bitmap_pos); | |
917 | display_progress(tdata->prg, ++tdata->seen); | |
918 | } | |
919 | ||
920 | static void test_show_commit(struct commit *commit, void *data) | |
921 | { | |
922 | struct bitmap_test_data *tdata = data; | |
923 | int bitmap_pos; | |
924 | ||
925 | bitmap_pos = bitmap_position(commit->object.sha1); | |
926 | if (bitmap_pos < 0) | |
927 | die("Object not in bitmap: %s\n", sha1_to_hex(commit->object.sha1)); | |
928 | ||
929 | bitmap_set(tdata->base, bitmap_pos); | |
930 | display_progress(tdata->prg, ++tdata->seen); | |
931 | } | |
932 | ||
933 | void test_bitmap_walk(struct rev_info *revs) | |
934 | { | |
935 | struct object *root; | |
936 | struct bitmap *result = NULL; | |
937 | khiter_t pos; | |
938 | size_t result_popcnt; | |
939 | struct bitmap_test_data tdata; | |
940 | ||
941 | if (prepare_bitmap_git()) | |
942 | die("failed to load bitmap indexes"); | |
943 | ||
944 | if (revs->pending.nr != 1) | |
945 | die("you must specify exactly one commit to test"); | |
946 | ||
947 | fprintf(stderr, "Bitmap v%d test (%d entries loaded)\n", | |
948 | bitmap_git.version, bitmap_git.entry_count); | |
949 | ||
950 | root = revs->pending.objects[0].item; | |
951 | pos = kh_get_sha1(bitmap_git.bitmaps, root->sha1); | |
952 | ||
953 | if (pos < kh_end(bitmap_git.bitmaps)) { | |
954 | struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, pos); | |
955 | struct ewah_bitmap *bm = lookup_stored_bitmap(st); | |
956 | ||
957 | fprintf(stderr, "Found bitmap for %s. %d bits / %08x checksum\n", | |
958 | sha1_to_hex(root->sha1), (int)bm->bit_size, ewah_checksum(bm)); | |
959 | ||
960 | result = ewah_to_bitmap(bm); | |
961 | } | |
962 | ||
963 | if (result == NULL) | |
964 | die("Commit %s doesn't have an indexed bitmap", sha1_to_hex(root->sha1)); | |
965 | ||
966 | revs->tag_objects = 1; | |
967 | revs->tree_objects = 1; | |
968 | revs->blob_objects = 1; | |
969 | ||
970 | result_popcnt = bitmap_popcount(result); | |
971 | ||
972 | if (prepare_revision_walk(revs)) | |
973 | die("revision walk setup failed"); | |
974 | ||
975 | tdata.base = bitmap_new(); | |
976 | tdata.prg = start_progress("Verifying bitmap entries", result_popcnt); | |
977 | tdata.seen = 0; | |
978 | ||
979 | traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata); | |
980 | ||
981 | stop_progress(&tdata.prg); | |
982 | ||
983 | if (bitmap_equals(result, tdata.base)) | |
984 | fprintf(stderr, "OK!\n"); | |
985 | else | |
986 | fprintf(stderr, "Mismatch!\n"); | |
f86a3747 | 987 | |
d201a1ec | 988 | bitmap_free(result); |
fff42755 | 989 | } |
7cc8f971 VM |
990 | |
991 | static int rebuild_bitmap(uint32_t *reposition, | |
992 | struct ewah_bitmap *source, | |
993 | struct bitmap *dest) | |
994 | { | |
995 | uint32_t pos = 0; | |
996 | struct ewah_iterator it; | |
997 | eword_t word; | |
998 | ||
999 | ewah_iterator_init(&it, source); | |
1000 | ||
1001 | while (ewah_iterator_next(&word, &it)) { | |
1002 | uint32_t offset, bit_pos; | |
1003 | ||
34b935c0 | 1004 | for (offset = 0; offset < BITS_IN_EWORD; ++offset) { |
7cc8f971 VM |
1005 | if ((word >> offset) == 0) |
1006 | break; | |
1007 | ||
1008 | offset += ewah_bit_ctz64(word >> offset); | |
1009 | ||
1010 | bit_pos = reposition[pos + offset]; | |
1011 | if (bit_pos > 0) | |
1012 | bitmap_set(dest, bit_pos - 1); | |
1013 | else /* can't reuse, we don't have the object */ | |
1014 | return -1; | |
1015 | } | |
1016 | ||
34b935c0 | 1017 | pos += BITS_IN_EWORD; |
7cc8f971 VM |
1018 | } |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | int rebuild_existing_bitmaps(struct packing_data *mapping, | |
1023 | khash_sha1 *reused_bitmaps, | |
1024 | int show_progress) | |
1025 | { | |
1026 | uint32_t i, num_objects; | |
1027 | uint32_t *reposition; | |
1028 | struct bitmap *rebuild; | |
1029 | struct stored_bitmap *stored; | |
1030 | struct progress *progress = NULL; | |
1031 | ||
1032 | khiter_t hash_pos; | |
1033 | int hash_ret; | |
1034 | ||
1035 | if (prepare_bitmap_git() < 0) | |
1036 | return -1; | |
1037 | ||
1038 | num_objects = bitmap_git.pack->num_objects; | |
1039 | reposition = xcalloc(num_objects, sizeof(uint32_t)); | |
1040 | ||
1041 | for (i = 0; i < num_objects; ++i) { | |
1042 | const unsigned char *sha1; | |
1043 | struct revindex_entry *entry; | |
1044 | struct object_entry *oe; | |
1045 | ||
1046 | entry = &bitmap_git.reverse_index->revindex[i]; | |
1047 | sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr); | |
1048 | oe = packlist_find(mapping, sha1, NULL); | |
1049 | ||
1050 | if (oe) | |
1051 | reposition[i] = oe->in_pack_pos + 1; | |
1052 | } | |
1053 | ||
1054 | rebuild = bitmap_new(); | |
1055 | i = 0; | |
1056 | ||
1057 | if (show_progress) | |
1058 | progress = start_progress("Reusing bitmaps", 0); | |
1059 | ||
1060 | kh_foreach_value(bitmap_git.bitmaps, stored, { | |
1061 | if (stored->flags & BITMAP_FLAG_REUSE) { | |
1062 | if (!rebuild_bitmap(reposition, | |
1063 | lookup_stored_bitmap(stored), | |
1064 | rebuild)) { | |
1065 | hash_pos = kh_put_sha1(reused_bitmaps, | |
1066 | stored->sha1, | |
1067 | &hash_ret); | |
1068 | kh_value(reused_bitmaps, hash_pos) = | |
1069 | bitmap_to_ewah(rebuild); | |
1070 | } | |
1071 | bitmap_reset(rebuild); | |
1072 | display_progress(progress, ++i); | |
1073 | } | |
1074 | }); | |
1075 | ||
1076 | stop_progress(&progress); | |
1077 | ||
1078 | free(reposition); | |
1079 | bitmap_free(rebuild); | |
1080 | return 0; | |
1081 | } |