| #include "cache.h" |
| #include "commit.h" |
| #include "tag.h" |
| #include "diff.h" |
| #include "revision.h" |
| #include "progress.h" |
| #include "list-objects.h" |
| #include "pack.h" |
| #include "pack-bitmap.h" |
| #include "pack-revindex.h" |
| #include "pack-objects.h" |
| |
| /* |
| * An entry on the bitmap index, representing the bitmap for a given |
| * commit. |
| */ |
| struct stored_bitmap { |
| unsigned char sha1[20]; |
| struct ewah_bitmap *root; |
| struct stored_bitmap *xor; |
| int flags; |
| }; |
| |
| /* |
| * The currently active bitmap index. By design, repositories only have |
| * a single bitmap index available (the index for the biggest packfile in |
| * the repository), since bitmap indexes need full closure. |
| * |
| * If there is more than one bitmap index available (e.g. because of alternates), |
| * the active bitmap index is the largest one. |
| */ |
| static struct bitmap_index { |
| /* Packfile to which this bitmap index belongs to */ |
| struct packed_git *pack; |
| |
| /* |
| * Mark the first `reuse_objects` in the packfile as reused: |
| * they will be sent as-is without using them for repacking |
| * calculations |
| */ |
| uint32_t reuse_objects; |
| |
| /* mmapped buffer of the whole bitmap index */ |
| unsigned char *map; |
| size_t map_size; /* size of the mmaped buffer */ |
| size_t map_pos; /* current position when loading the index */ |
| |
| /* |
| * Type indexes. |
| * |
| * Each bitmap marks which objects in the packfile are of the given |
| * type. This provides type information when yielding the objects from |
| * the packfile during a walk, which allows for better delta bases. |
| */ |
| struct ewah_bitmap *commits; |
| struct ewah_bitmap *trees; |
| struct ewah_bitmap *blobs; |
| struct ewah_bitmap *tags; |
| |
| /* Map from SHA1 -> `stored_bitmap` for all the bitmapped commits */ |
| khash_sha1 *bitmaps; |
| |
| /* Number of bitmapped commits */ |
| uint32_t entry_count; |
| |
| /* Name-hash cache (or NULL if not present). */ |
| uint32_t *hashes; |
| |
| /* |
| * Extended index. |
| * |
| * When trying to perform bitmap operations with objects that are not |
| * packed in `pack`, these objects are added to this "fake index" and |
| * are assumed to appear at the end of the packfile for all operations |
| */ |
| struct eindex { |
| struct object **objects; |
| uint32_t *hashes; |
| uint32_t count, alloc; |
| khash_sha1_pos *positions; |
| } ext_index; |
| |
| /* Bitmap result of the last performed walk */ |
| struct bitmap *result; |
| |
| /* Version of the bitmap index */ |
| unsigned int version; |
| |
| unsigned loaded : 1; |
| |
| } bitmap_git; |
| |
| static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st) |
| { |
| struct ewah_bitmap *parent; |
| struct ewah_bitmap *composed; |
| |
| if (st->xor == NULL) |
| return st->root; |
| |
| composed = ewah_pool_new(); |
| parent = lookup_stored_bitmap(st->xor); |
| ewah_xor(st->root, parent, composed); |
| |
| ewah_pool_free(st->root); |
| st->root = composed; |
| st->xor = NULL; |
| |
| return composed; |
| } |
| |
| /* |
| * Read a bitmap from the current read position on the mmaped |
| * index, and increase the read position accordingly |
| */ |
| static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index) |
| { |
| struct ewah_bitmap *b = ewah_pool_new(); |
| |
| int bitmap_size = ewah_read_mmap(b, |
| index->map + index->map_pos, |
| index->map_size - index->map_pos); |
| |
| if (bitmap_size < 0) { |
| error("Failed to load bitmap index (corrupted?)"); |
| ewah_pool_free(b); |
| return NULL; |
| } |
| |
| index->map_pos += bitmap_size; |
| return b; |
| } |
| |
| static int load_bitmap_header(struct bitmap_index *index) |
| { |
| struct bitmap_disk_header *header = (void *)index->map; |
| |
| if (index->map_size < sizeof(*header) + 20) |
| return error("Corrupted bitmap index (missing header data)"); |
| |
| if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0) |
| return error("Corrupted bitmap index file (wrong header)"); |
| |
| index->version = ntohs(header->version); |
| if (index->version != 1) |
| return error("Unsupported version for bitmap index file (%d)", index->version); |
| |
| /* Parse known bitmap format options */ |
| { |
| uint32_t flags = ntohs(header->options); |
| |
| if ((flags & BITMAP_OPT_FULL_DAG) == 0) |
| return error("Unsupported options for bitmap index file " |
| "(Git requires BITMAP_OPT_FULL_DAG)"); |
| |
| if (flags & BITMAP_OPT_HASH_CACHE) { |
| unsigned char *end = index->map + index->map_size - 20; |
| index->hashes = ((uint32_t *)end) - index->pack->num_objects; |
| } |
| } |
| |
| index->entry_count = ntohl(header->entry_count); |
| index->map_pos += sizeof(*header); |
| return 0; |
| } |
| |
| static struct stored_bitmap *store_bitmap(struct bitmap_index *index, |
| struct ewah_bitmap *root, |
| const unsigned char *sha1, |
| struct stored_bitmap *xor_with, |
| int flags) |
| { |
| struct stored_bitmap *stored; |
| khiter_t hash_pos; |
| int ret; |
| |
| stored = xmalloc(sizeof(struct stored_bitmap)); |
| stored->root = root; |
| stored->xor = xor_with; |
| stored->flags = flags; |
| hashcpy(stored->sha1, sha1); |
| |
| hash_pos = kh_put_sha1(index->bitmaps, stored->sha1, &ret); |
| |
| /* a 0 return code means the insertion succeeded with no changes, |
| * because the SHA1 already existed on the map. this is bad, there |
| * shouldn't be duplicated commits in the index */ |
| if (ret == 0) { |
| error("Duplicate entry in bitmap index: %s", sha1_to_hex(sha1)); |
| return NULL; |
| } |
| |
| kh_value(index->bitmaps, hash_pos) = stored; |
| return stored; |
| } |
| |
| static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos) |
| { |
| uint32_t result = get_be32(buffer + *pos); |
| (*pos) += sizeof(result); |
| return result; |
| } |
| |
| static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos) |
| { |
| return buffer[(*pos)++]; |
| } |
| |
| #define MAX_XOR_OFFSET 160 |
| |
| static int load_bitmap_entries_v1(struct bitmap_index *index) |
| { |
| uint32_t i; |
| struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL }; |
| |
| for (i = 0; i < index->entry_count; ++i) { |
| int xor_offset, flags; |
| struct ewah_bitmap *bitmap = NULL; |
| struct stored_bitmap *xor_bitmap = NULL; |
| uint32_t commit_idx_pos; |
| const unsigned char *sha1; |
| |
| commit_idx_pos = read_be32(index->map, &index->map_pos); |
| xor_offset = read_u8(index->map, &index->map_pos); |
| flags = read_u8(index->map, &index->map_pos); |
| |
| sha1 = nth_packed_object_sha1(index->pack, commit_idx_pos); |
| |
| bitmap = read_bitmap_1(index); |
| if (!bitmap) |
| return -1; |
| |
| if (xor_offset > MAX_XOR_OFFSET || xor_offset > i) |
| return error("Corrupted bitmap pack index"); |
| |
| if (xor_offset > 0) { |
| xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET]; |
| |
| if (xor_bitmap == NULL) |
| return error("Invalid XOR offset in bitmap pack index"); |
| } |
| |
| recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap( |
| index, bitmap, sha1, xor_bitmap, flags); |
| } |
| |
| return 0; |
| } |
| |
| static char *pack_bitmap_filename(struct packed_git *p) |
| { |
| size_t len; |
| |
| if (!strip_suffix(p->pack_name, ".pack", &len)) |
| die("BUG: pack_name does not end in .pack"); |
| return xstrfmt("%.*s.bitmap", (int)len, p->pack_name); |
| } |
| |
| static int open_pack_bitmap_1(struct packed_git *packfile) |
| { |
| int fd; |
| struct stat st; |
| char *idx_name; |
| |
| if (open_pack_index(packfile)) |
| return -1; |
| |
| idx_name = pack_bitmap_filename(packfile); |
| fd = git_open(idx_name); |
| free(idx_name); |
| |
| if (fd < 0) |
| return -1; |
| |
| if (fstat(fd, &st)) { |
| close(fd); |
| return -1; |
| } |
| |
| if (bitmap_git.pack) { |
| warning("ignoring extra bitmap file: %s", packfile->pack_name); |
| close(fd); |
| return -1; |
| } |
| |
| bitmap_git.pack = packfile; |
| bitmap_git.map_size = xsize_t(st.st_size); |
| bitmap_git.map = xmmap(NULL, bitmap_git.map_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| bitmap_git.map_pos = 0; |
| close(fd); |
| |
| if (load_bitmap_header(&bitmap_git) < 0) { |
| munmap(bitmap_git.map, bitmap_git.map_size); |
| bitmap_git.map = NULL; |
| bitmap_git.map_size = 0; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int load_pack_bitmap(void) |
| { |
| assert(bitmap_git.map && !bitmap_git.loaded); |
| |
| bitmap_git.bitmaps = kh_init_sha1(); |
| bitmap_git.ext_index.positions = kh_init_sha1_pos(); |
| load_pack_revindex(bitmap_git.pack); |
| |
| if (!(bitmap_git.commits = read_bitmap_1(&bitmap_git)) || |
| !(bitmap_git.trees = read_bitmap_1(&bitmap_git)) || |
| !(bitmap_git.blobs = read_bitmap_1(&bitmap_git)) || |
| !(bitmap_git.tags = read_bitmap_1(&bitmap_git))) |
| goto failed; |
| |
| if (load_bitmap_entries_v1(&bitmap_git) < 0) |
| goto failed; |
| |
| bitmap_git.loaded = 1; |
| return 0; |
| |
| failed: |
| munmap(bitmap_git.map, bitmap_git.map_size); |
| bitmap_git.map = NULL; |
| bitmap_git.map_size = 0; |
| return -1; |
| } |
| |
| static int open_pack_bitmap(void) |
| { |
| struct packed_git *p; |
| int ret = -1; |
| |
| assert(!bitmap_git.map && !bitmap_git.loaded); |
| |
| prepare_packed_git(); |
| for (p = packed_git; p; p = p->next) { |
| if (open_pack_bitmap_1(p) == 0) |
| ret = 0; |
| } |
| |
| return ret; |
| } |
| |
| int prepare_bitmap_git(void) |
| { |
| if (bitmap_git.loaded) |
| return 0; |
| |
| if (!open_pack_bitmap()) |
| return load_pack_bitmap(); |
| |
| return -1; |
| } |
| |
| struct include_data { |
| struct bitmap *base; |
| struct bitmap *seen; |
| }; |
| |
| static inline int bitmap_position_extended(const unsigned char *sha1) |
| { |
| khash_sha1_pos *positions = bitmap_git.ext_index.positions; |
| khiter_t pos = kh_get_sha1_pos(positions, sha1); |
| |
| if (pos < kh_end(positions)) { |
| int bitmap_pos = kh_value(positions, pos); |
| return bitmap_pos + bitmap_git.pack->num_objects; |
| } |
| |
| return -1; |
| } |
| |
| static inline int bitmap_position_packfile(const unsigned char *sha1) |
| { |
| off_t offset = find_pack_entry_one(sha1, bitmap_git.pack); |
| if (!offset) |
| return -1; |
| |
| return find_revindex_position(bitmap_git.pack, offset); |
| } |
| |
| static int bitmap_position(const unsigned char *sha1) |
| { |
| int pos = bitmap_position_packfile(sha1); |
| return (pos >= 0) ? pos : bitmap_position_extended(sha1); |
| } |
| |
| static int ext_index_add_object(struct object *object, const char *name) |
| { |
| struct eindex *eindex = &bitmap_git.ext_index; |
| |
| khiter_t hash_pos; |
| int hash_ret; |
| int bitmap_pos; |
| |
| hash_pos = kh_put_sha1_pos(eindex->positions, object->oid.hash, &hash_ret); |
| if (hash_ret > 0) { |
| if (eindex->count >= eindex->alloc) { |
| eindex->alloc = (eindex->alloc + 16) * 3 / 2; |
| REALLOC_ARRAY(eindex->objects, eindex->alloc); |
| REALLOC_ARRAY(eindex->hashes, eindex->alloc); |
| } |
| |
| bitmap_pos = eindex->count; |
| eindex->objects[eindex->count] = object; |
| eindex->hashes[eindex->count] = pack_name_hash(name); |
| kh_value(eindex->positions, hash_pos) = bitmap_pos; |
| eindex->count++; |
| } else { |
| bitmap_pos = kh_value(eindex->positions, hash_pos); |
| } |
| |
| return bitmap_pos + bitmap_git.pack->num_objects; |
| } |
| |
| static void show_object(struct object *object, const char *name, void *data) |
| { |
| struct bitmap *base = data; |
| int bitmap_pos; |
| |
| bitmap_pos = bitmap_position(object->oid.hash); |
| |
| if (bitmap_pos < 0) |
| bitmap_pos = ext_index_add_object(object, name); |
| |
| bitmap_set(base, bitmap_pos); |
| } |
| |
| static void show_commit(struct commit *commit, void *data) |
| { |
| } |
| |
| static int add_to_include_set(struct include_data *data, |
| const unsigned char *sha1, |
| int bitmap_pos) |
| { |
| khiter_t hash_pos; |
| |
| if (data->seen && bitmap_get(data->seen, bitmap_pos)) |
| return 0; |
| |
| if (bitmap_get(data->base, bitmap_pos)) |
| return 0; |
| |
| hash_pos = kh_get_sha1(bitmap_git.bitmaps, sha1); |
| if (hash_pos < kh_end(bitmap_git.bitmaps)) { |
| struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, hash_pos); |
| bitmap_or_ewah(data->base, lookup_stored_bitmap(st)); |
| return 0; |
| } |
| |
| bitmap_set(data->base, bitmap_pos); |
| return 1; |
| } |
| |
| static int should_include(struct commit *commit, void *_data) |
| { |
| struct include_data *data = _data; |
| int bitmap_pos; |
| |
| bitmap_pos = bitmap_position(commit->object.oid.hash); |
| if (bitmap_pos < 0) |
| bitmap_pos = ext_index_add_object((struct object *)commit, NULL); |
| |
| if (!add_to_include_set(data, commit->object.oid.hash, bitmap_pos)) { |
| struct commit_list *parent = commit->parents; |
| |
| while (parent) { |
| parent->item->object.flags |= SEEN; |
| parent = parent->next; |
| } |
| |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static struct bitmap *find_objects(struct rev_info *revs, |
| struct object_list *roots, |
| struct bitmap *seen) |
| { |
| struct bitmap *base = NULL; |
| int needs_walk = 0; |
| |
| struct object_list *not_mapped = NULL; |
| |
| /* |
| * Go through all the roots for the walk. The ones that have bitmaps |
| * on the bitmap index will be `or`ed together to form an initial |
| * global reachability analysis. |
| * |
| * The ones without bitmaps in the index will be stored in the |
| * `not_mapped_list` for further processing. |
| */ |
| while (roots) { |
| struct object *object = roots->item; |
| roots = roots->next; |
| |
| if (object->type == OBJ_COMMIT) { |
| khiter_t pos = kh_get_sha1(bitmap_git.bitmaps, object->oid.hash); |
| |
| if (pos < kh_end(bitmap_git.bitmaps)) { |
| struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, pos); |
| struct ewah_bitmap *or_with = lookup_stored_bitmap(st); |
| |
| if (base == NULL) |
| base = ewah_to_bitmap(or_with); |
| else |
| bitmap_or_ewah(base, or_with); |
| |
| object->flags |= SEEN; |
| continue; |
| } |
| } |
| |
| object_list_insert(object, ¬_mapped); |
| } |
| |
| /* |
| * Best case scenario: We found bitmaps for all the roots, |
| * so the resulting `or` bitmap has the full reachability analysis |
| */ |
| if (not_mapped == NULL) |
| return base; |
| |
| roots = not_mapped; |
| |
| /* |
| * Let's iterate through all the roots that don't have bitmaps to |
| * check if we can determine them to be reachable from the existing |
| * global bitmap. |
| * |
| * If we cannot find them in the existing global bitmap, we'll need |
| * to push them to an actual walk and run it until we can confirm |
| * they are reachable |
| */ |
| while (roots) { |
| struct object *object = roots->item; |
| int pos; |
| |
| roots = roots->next; |
| pos = bitmap_position(object->oid.hash); |
| |
| if (pos < 0 || base == NULL || !bitmap_get(base, pos)) { |
| object->flags &= ~UNINTERESTING; |
| add_pending_object(revs, object, ""); |
| needs_walk = 1; |
| } else { |
| object->flags |= SEEN; |
| } |
| } |
| |
| if (needs_walk) { |
| struct include_data incdata; |
| |
| if (base == NULL) |
| base = bitmap_new(); |
| |
| incdata.base = base; |
| incdata.seen = seen; |
| |
| revs->include_check = should_include; |
| revs->include_check_data = &incdata; |
| |
| if (prepare_revision_walk(revs)) |
| die("revision walk setup failed"); |
| |
| traverse_commit_list(revs, show_commit, show_object, base); |
| } |
| |
| return base; |
| } |
| |
| static void show_extended_objects(struct bitmap *objects, |
| show_reachable_fn show_reach) |
| { |
| struct eindex *eindex = &bitmap_git.ext_index; |
| uint32_t i; |
| |
| for (i = 0; i < eindex->count; ++i) { |
| struct object *obj; |
| |
| if (!bitmap_get(objects, bitmap_git.pack->num_objects + i)) |
| continue; |
| |
| obj = eindex->objects[i]; |
| show_reach(obj->oid.hash, obj->type, 0, eindex->hashes[i], NULL, 0); |
| } |
| } |
| |
| static void show_objects_for_type( |
| struct bitmap *objects, |
| struct ewah_bitmap *type_filter, |
| enum object_type object_type, |
| show_reachable_fn show_reach) |
| { |
| size_t pos = 0, i = 0; |
| uint32_t offset; |
| |
| struct ewah_iterator it; |
| eword_t filter; |
| |
| if (bitmap_git.reuse_objects == bitmap_git.pack->num_objects) |
| return; |
| |
| ewah_iterator_init(&it, type_filter); |
| |
| while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) { |
| eword_t word = objects->words[i] & filter; |
| |
| for (offset = 0; offset < BITS_IN_EWORD; ++offset) { |
| const unsigned char *sha1; |
| struct revindex_entry *entry; |
| uint32_t hash = 0; |
| |
| if ((word >> offset) == 0) |
| break; |
| |
| offset += ewah_bit_ctz64(word >> offset); |
| |
| if (pos + offset < bitmap_git.reuse_objects) |
| continue; |
| |
| entry = &bitmap_git.pack->revindex[pos + offset]; |
| sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr); |
| |
| if (bitmap_git.hashes) |
| hash = get_be32(bitmap_git.hashes + entry->nr); |
| |
| show_reach(sha1, object_type, 0, hash, bitmap_git.pack, entry->offset); |
| } |
| |
| pos += BITS_IN_EWORD; |
| i++; |
| } |
| } |
| |
| static int in_bitmapped_pack(struct object_list *roots) |
| { |
| while (roots) { |
| struct object *object = roots->item; |
| roots = roots->next; |
| |
| if (find_pack_entry_one(object->oid.hash, bitmap_git.pack) > 0) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| int prepare_bitmap_walk(struct rev_info *revs) |
| { |
| unsigned int i; |
| unsigned int pending_nr = revs->pending.nr; |
| struct object_array_entry *pending_e = revs->pending.objects; |
| |
| struct object_list *wants = NULL; |
| struct object_list *haves = NULL; |
| |
| struct bitmap *wants_bitmap = NULL; |
| struct bitmap *haves_bitmap = NULL; |
| |
| if (!bitmap_git.loaded) { |
| /* try to open a bitmapped pack, but don't parse it yet |
| * because we may not need to use it */ |
| if (open_pack_bitmap() < 0) |
| return -1; |
| } |
| |
| for (i = 0; i < pending_nr; ++i) { |
| struct object *object = pending_e[i].item; |
| |
| if (object->type == OBJ_NONE) |
| parse_object_or_die(&object->oid, NULL); |
| |
| while (object->type == OBJ_TAG) { |
| struct tag *tag = (struct tag *) object; |
| |
| if (object->flags & UNINTERESTING) |
| object_list_insert(object, &haves); |
| else |
| object_list_insert(object, &wants); |
| |
| if (!tag->tagged) |
| die("bad tag"); |
| object = parse_object_or_die(&tag->tagged->oid, NULL); |
| } |
| |
| if (object->flags & UNINTERESTING) |
| object_list_insert(object, &haves); |
| else |
| object_list_insert(object, &wants); |
| } |
| |
| /* |
| * if we have a HAVES list, but none of those haves is contained |
| * in the packfile that has a bitmap, we don't have anything to |
| * optimize here |
| */ |
| if (haves && !in_bitmapped_pack(haves)) |
| return -1; |
| |
| /* if we don't want anything, we're done here */ |
| if (!wants) |
| return -1; |
| |
| /* |
| * now we're going to use bitmaps, so load the actual bitmap entries |
| * from disk. this is the point of no return; after this the rev_list |
| * becomes invalidated and we must perform the revwalk through bitmaps |
| */ |
| if (!bitmap_git.loaded && load_pack_bitmap() < 0) |
| return -1; |
| |
| revs->pending.nr = 0; |
| revs->pending.alloc = 0; |
| revs->pending.objects = NULL; |
| |
| if (haves) { |
| revs->ignore_missing_links = 1; |
| haves_bitmap = find_objects(revs, haves, NULL); |
| reset_revision_walk(); |
| revs->ignore_missing_links = 0; |
| |
| if (haves_bitmap == NULL) |
| die("BUG: failed to perform bitmap walk"); |
| } |
| |
| wants_bitmap = find_objects(revs, wants, haves_bitmap); |
| |
| if (!wants_bitmap) |
| die("BUG: failed to perform bitmap walk"); |
| |
| if (haves_bitmap) |
| bitmap_and_not(wants_bitmap, haves_bitmap); |
| |
| bitmap_git.result = wants_bitmap; |
| |
| bitmap_free(haves_bitmap); |
| return 0; |
| } |
| |
| int reuse_partial_packfile_from_bitmap(struct packed_git **packfile, |
| uint32_t *entries, |
| off_t *up_to) |
| { |
| /* |
| * Reuse the packfile content if we need more than |
| * 90% of its objects |
| */ |
| static const double REUSE_PERCENT = 0.9; |
| |
| struct bitmap *result = bitmap_git.result; |
| uint32_t reuse_threshold; |
| uint32_t i, reuse_objects = 0; |
| |
| assert(result); |
| |
| for (i = 0; i < result->word_alloc; ++i) { |
| if (result->words[i] != (eword_t)~0) { |
| reuse_objects += ewah_bit_ctz64(~result->words[i]); |
| break; |
| } |
| |
| reuse_objects += BITS_IN_EWORD; |
| } |
| |
| #ifdef GIT_BITMAP_DEBUG |
| { |
| const unsigned char *sha1; |
| struct revindex_entry *entry; |
| |
| entry = &bitmap_git.reverse_index->revindex[reuse_objects]; |
| sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr); |
| |
| fprintf(stderr, "Failed to reuse at %d (%016llx)\n", |
| reuse_objects, result->words[i]); |
| fprintf(stderr, " %s\n", sha1_to_hex(sha1)); |
| } |
| #endif |
| |
| if (!reuse_objects) |
| return -1; |
| |
| if (reuse_objects >= bitmap_git.pack->num_objects) { |
| bitmap_git.reuse_objects = *entries = bitmap_git.pack->num_objects; |
| *up_to = -1; /* reuse the full pack */ |
| *packfile = bitmap_git.pack; |
| return 0; |
| } |
| |
| reuse_threshold = bitmap_popcount(bitmap_git.result) * REUSE_PERCENT; |
| |
| if (reuse_objects < reuse_threshold) |
| return -1; |
| |
| bitmap_git.reuse_objects = *entries = reuse_objects; |
| *up_to = bitmap_git.pack->revindex[reuse_objects].offset; |
| *packfile = bitmap_git.pack; |
| |
| return 0; |
| } |
| |
| void traverse_bitmap_commit_list(show_reachable_fn show_reachable) |
| { |
| assert(bitmap_git.result); |
| |
| show_objects_for_type(bitmap_git.result, bitmap_git.commits, |
| OBJ_COMMIT, show_reachable); |
| show_objects_for_type(bitmap_git.result, bitmap_git.trees, |
| OBJ_TREE, show_reachable); |
| show_objects_for_type(bitmap_git.result, bitmap_git.blobs, |
| OBJ_BLOB, show_reachable); |
| show_objects_for_type(bitmap_git.result, bitmap_git.tags, |
| OBJ_TAG, show_reachable); |
| |
| show_extended_objects(bitmap_git.result, show_reachable); |
| |
| bitmap_free(bitmap_git.result); |
| bitmap_git.result = NULL; |
| } |
| |
| static uint32_t count_object_type(struct bitmap *objects, |
| enum object_type type) |
| { |
| struct eindex *eindex = &bitmap_git.ext_index; |
| |
| uint32_t i = 0, count = 0; |
| struct ewah_iterator it; |
| eword_t filter; |
| |
| switch (type) { |
| case OBJ_COMMIT: |
| ewah_iterator_init(&it, bitmap_git.commits); |
| break; |
| |
| case OBJ_TREE: |
| ewah_iterator_init(&it, bitmap_git.trees); |
| break; |
| |
| case OBJ_BLOB: |
| ewah_iterator_init(&it, bitmap_git.blobs); |
| break; |
| |
| case OBJ_TAG: |
| ewah_iterator_init(&it, bitmap_git.tags); |
| break; |
| |
| default: |
| return 0; |
| } |
| |
| while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) { |
| eword_t word = objects->words[i++] & filter; |
| count += ewah_bit_popcount64(word); |
| } |
| |
| for (i = 0; i < eindex->count; ++i) { |
| if (eindex->objects[i]->type == type && |
| bitmap_get(objects, bitmap_git.pack->num_objects + i)) |
| count++; |
| } |
| |
| return count; |
| } |
| |
| void count_bitmap_commit_list(uint32_t *commits, uint32_t *trees, |
| uint32_t *blobs, uint32_t *tags) |
| { |
| assert(bitmap_git.result); |
| |
| if (commits) |
| *commits = count_object_type(bitmap_git.result, OBJ_COMMIT); |
| |
| if (trees) |
| *trees = count_object_type(bitmap_git.result, OBJ_TREE); |
| |
| if (blobs) |
| *blobs = count_object_type(bitmap_git.result, OBJ_BLOB); |
| |
| if (tags) |
| *tags = count_object_type(bitmap_git.result, OBJ_TAG); |
| } |
| |
| struct bitmap_test_data { |
| struct bitmap *base; |
| struct progress *prg; |
| size_t seen; |
| }; |
| |
| static void test_show_object(struct object *object, const char *name, |
| void *data) |
| { |
| struct bitmap_test_data *tdata = data; |
| int bitmap_pos; |
| |
| bitmap_pos = bitmap_position(object->oid.hash); |
| if (bitmap_pos < 0) |
| die("Object not in bitmap: %s\n", oid_to_hex(&object->oid)); |
| |
| bitmap_set(tdata->base, bitmap_pos); |
| display_progress(tdata->prg, ++tdata->seen); |
| } |
| |
| static void test_show_commit(struct commit *commit, void *data) |
| { |
| struct bitmap_test_data *tdata = data; |
| int bitmap_pos; |
| |
| bitmap_pos = bitmap_position(commit->object.oid.hash); |
| if (bitmap_pos < 0) |
| die("Object not in bitmap: %s\n", oid_to_hex(&commit->object.oid)); |
| |
| bitmap_set(tdata->base, bitmap_pos); |
| display_progress(tdata->prg, ++tdata->seen); |
| } |
| |
| void test_bitmap_walk(struct rev_info *revs) |
| { |
| struct object *root; |
| struct bitmap *result = NULL; |
| khiter_t pos; |
| size_t result_popcnt; |
| struct bitmap_test_data tdata; |
| |
| if (prepare_bitmap_git()) |
| die("failed to load bitmap indexes"); |
| |
| if (revs->pending.nr != 1) |
| die("you must specify exactly one commit to test"); |
| |
| fprintf(stderr, "Bitmap v%d test (%d entries loaded)\n", |
| bitmap_git.version, bitmap_git.entry_count); |
| |
| root = revs->pending.objects[0].item; |
| pos = kh_get_sha1(bitmap_git.bitmaps, root->oid.hash); |
| |
| if (pos < kh_end(bitmap_git.bitmaps)) { |
| struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, pos); |
| struct ewah_bitmap *bm = lookup_stored_bitmap(st); |
| |
| fprintf(stderr, "Found bitmap for %s. %d bits / %08x checksum\n", |
| oid_to_hex(&root->oid), (int)bm->bit_size, ewah_checksum(bm)); |
| |
| result = ewah_to_bitmap(bm); |
| } |
| |
| if (result == NULL) |
| die("Commit %s doesn't have an indexed bitmap", oid_to_hex(&root->oid)); |
| |
| revs->tag_objects = 1; |
| revs->tree_objects = 1; |
| revs->blob_objects = 1; |
| |
| result_popcnt = bitmap_popcount(result); |
| |
| if (prepare_revision_walk(revs)) |
| die("revision walk setup failed"); |
| |
| tdata.base = bitmap_new(); |
| tdata.prg = start_progress("Verifying bitmap entries", result_popcnt); |
| tdata.seen = 0; |
| |
| traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata); |
| |
| stop_progress(&tdata.prg); |
| |
| if (bitmap_equals(result, tdata.base)) |
| fprintf(stderr, "OK!\n"); |
| else |
| fprintf(stderr, "Mismatch!\n"); |
| |
| bitmap_free(result); |
| } |
| |
| static int rebuild_bitmap(uint32_t *reposition, |
| struct ewah_bitmap *source, |
| struct bitmap *dest) |
| { |
| uint32_t pos = 0; |
| struct ewah_iterator it; |
| eword_t word; |
| |
| ewah_iterator_init(&it, source); |
| |
| while (ewah_iterator_next(&word, &it)) { |
| uint32_t offset, bit_pos; |
| |
| for (offset = 0; offset < BITS_IN_EWORD; ++offset) { |
| if ((word >> offset) == 0) |
| break; |
| |
| offset += ewah_bit_ctz64(word >> offset); |
| |
| bit_pos = reposition[pos + offset]; |
| if (bit_pos > 0) |
| bitmap_set(dest, bit_pos - 1); |
| else /* can't reuse, we don't have the object */ |
| return -1; |
| } |
| |
| pos += BITS_IN_EWORD; |
| } |
| return 0; |
| } |
| |
| int rebuild_existing_bitmaps(struct packing_data *mapping, |
| khash_sha1 *reused_bitmaps, |
| int show_progress) |
| { |
| uint32_t i, num_objects; |
| uint32_t *reposition; |
| struct bitmap *rebuild; |
| struct stored_bitmap *stored; |
| struct progress *progress = NULL; |
| |
| khiter_t hash_pos; |
| int hash_ret; |
| |
| if (prepare_bitmap_git() < 0) |
| return -1; |
| |
| num_objects = bitmap_git.pack->num_objects; |
| reposition = xcalloc(num_objects, sizeof(uint32_t)); |
| |
| for (i = 0; i < num_objects; ++i) { |
| const unsigned char *sha1; |
| struct revindex_entry *entry; |
| struct object_entry *oe; |
| |
| entry = &bitmap_git.pack->revindex[i]; |
| sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr); |
| oe = packlist_find(mapping, sha1, NULL); |
| |
| if (oe) |
| reposition[i] = oe->in_pack_pos + 1; |
| } |
| |
| rebuild = bitmap_new(); |
| i = 0; |
| |
| if (show_progress) |
| progress = start_progress("Reusing bitmaps", 0); |
| |
| kh_foreach_value(bitmap_git.bitmaps, stored, { |
| if (stored->flags & BITMAP_FLAG_REUSE) { |
| if (!rebuild_bitmap(reposition, |
| lookup_stored_bitmap(stored), |
| rebuild)) { |
| hash_pos = kh_put_sha1(reused_bitmaps, |
| stored->sha1, |
| &hash_ret); |
| kh_value(reused_bitmaps, hash_pos) = |
| bitmap_to_ewah(rebuild); |
| } |
| bitmap_reset(rebuild); |
| display_progress(progress, ++i); |
| } |
| }); |
| |
| stop_progress(&progress); |
| |
| free(reposition); |
| bitmap_free(rebuild); |
| return 0; |
| } |