| #define USE_THE_REPOSITORY_VARIABLE |
| |
| #include "git-compat-util.h" |
| #include "refs.h" |
| #include "object-store-ll.h" |
| #include "cache-tree.h" |
| #include "mergesort.h" |
| #include "commit.h" |
| #include "convert.h" |
| #include "diff.h" |
| #include "diffcore.h" |
| #include "gettext.h" |
| #include "hex.h" |
| #include "path.h" |
| #include "read-cache.h" |
| #include "revision.h" |
| #include "setup.h" |
| #include "tag.h" |
| #include "trace2.h" |
| #include "blame.h" |
| #include "alloc.h" |
| #include "commit-slab.h" |
| #include "bloom.h" |
| #include "commit-graph.h" |
| |
| define_commit_slab(blame_suspects, struct blame_origin *); |
| static struct blame_suspects blame_suspects; |
| |
| struct blame_origin *get_blame_suspects(struct commit *commit) |
| { |
| struct blame_origin **result; |
| |
| result = blame_suspects_peek(&blame_suspects, commit); |
| |
| return result ? *result : NULL; |
| } |
| |
| static void set_blame_suspects(struct commit *commit, struct blame_origin *origin) |
| { |
| *blame_suspects_at(&blame_suspects, commit) = origin; |
| } |
| |
| void blame_origin_decref(struct blame_origin *o) |
| { |
| if (o && --o->refcnt <= 0) { |
| struct blame_origin *p, *l = NULL; |
| if (o->previous) |
| blame_origin_decref(o->previous); |
| free(o->file.ptr); |
| /* Should be present exactly once in commit chain */ |
| for (p = get_blame_suspects(o->commit); p; l = p, p = p->next) { |
| if (p == o) { |
| if (l) |
| l->next = p->next; |
| else |
| set_blame_suspects(o->commit, p->next); |
| free(o); |
| return; |
| } |
| } |
| die("internal error in blame_origin_decref"); |
| } |
| } |
| |
| /* |
| * Given a commit and a path in it, create a new origin structure. |
| * The callers that add blame to the scoreboard should use |
| * get_origin() to obtain shared, refcounted copy instead of calling |
| * this function directly. |
| */ |
| static struct blame_origin *make_origin(struct commit *commit, const char *path) |
| { |
| struct blame_origin *o; |
| FLEX_ALLOC_STR(o, path, path); |
| o->commit = commit; |
| o->refcnt = 1; |
| o->next = get_blame_suspects(commit); |
| set_blame_suspects(commit, o); |
| return o; |
| } |
| |
| /* |
| * Locate an existing origin or create a new one. |
| * This moves the origin to front position in the commit util list. |
| */ |
| static struct blame_origin *get_origin(struct commit *commit, const char *path) |
| { |
| struct blame_origin *o, *l; |
| |
| for (o = get_blame_suspects(commit), l = NULL; o; l = o, o = o->next) { |
| if (!strcmp(o->path, path)) { |
| /* bump to front */ |
| if (l) { |
| l->next = o->next; |
| o->next = get_blame_suspects(commit); |
| set_blame_suspects(commit, o); |
| } |
| return blame_origin_incref(o); |
| } |
| } |
| return make_origin(commit, path); |
| } |
| |
| |
| |
| static void verify_working_tree_path(struct repository *r, |
| struct commit *work_tree, const char *path) |
| { |
| struct commit_list *parents; |
| int pos; |
| |
| for (parents = work_tree->parents; parents; parents = parents->next) { |
| const struct object_id *commit_oid = &parents->item->object.oid; |
| struct object_id blob_oid; |
| unsigned short mode; |
| |
| if (!get_tree_entry(r, commit_oid, path, &blob_oid, &mode) && |
| oid_object_info(r, &blob_oid, NULL) == OBJ_BLOB) |
| return; |
| } |
| |
| pos = index_name_pos(r->index, path, strlen(path)); |
| if (pos >= 0) |
| ; /* path is in the index */ |
| else if (-1 - pos < r->index->cache_nr && |
| !strcmp(r->index->cache[-1 - pos]->name, path)) |
| ; /* path is in the index, unmerged */ |
| else |
| die("no such path '%s' in HEAD", path); |
| } |
| |
| static struct commit_list **append_parent(struct repository *r, |
| struct commit_list **tail, |
| const struct object_id *oid) |
| { |
| struct commit *parent; |
| |
| parent = lookup_commit_reference(r, oid); |
| if (!parent) |
| die("no such commit %s", oid_to_hex(oid)); |
| return &commit_list_insert(parent, tail)->next; |
| } |
| |
| static void append_merge_parents(struct repository *r, |
| struct commit_list **tail) |
| { |
| int merge_head; |
| struct strbuf line = STRBUF_INIT; |
| |
| merge_head = open(git_path_merge_head(r), O_RDONLY); |
| if (merge_head < 0) { |
| if (errno == ENOENT) |
| return; |
| die("cannot open '%s' for reading", |
| git_path_merge_head(r)); |
| } |
| |
| while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) { |
| struct object_id oid; |
| if (get_oid_hex(line.buf, &oid)) |
| die("unknown line in '%s': %s", |
| git_path_merge_head(r), line.buf); |
| tail = append_parent(r, tail, &oid); |
| } |
| close(merge_head); |
| strbuf_release(&line); |
| } |
| |
| /* |
| * This isn't as simple as passing sb->buf and sb->len, because we |
| * want to transfer ownership of the buffer to the commit (so we |
| * must use detach). |
| */ |
| static void set_commit_buffer_from_strbuf(struct repository *r, |
| struct commit *c, |
| struct strbuf *sb) |
| { |
| size_t len; |
| void *buf = strbuf_detach(sb, &len); |
| set_commit_buffer(r, c, buf, len); |
| } |
| |
| /* |
| * Prepare a dummy commit that represents the work tree (or staged) item. |
| * Note that annotating work tree item never works in the reverse. |
| */ |
| static struct commit *fake_working_tree_commit(struct repository *r, |
| struct diff_options *opt, |
| const char *path, |
| const char *contents_from, |
| struct object_id *oid) |
| { |
| struct commit *commit; |
| struct blame_origin *origin; |
| struct commit_list **parent_tail, *parent; |
| struct strbuf buf = STRBUF_INIT; |
| const char *ident; |
| time_t now; |
| int len; |
| struct cache_entry *ce; |
| unsigned mode; |
| struct strbuf msg = STRBUF_INIT; |
| |
| repo_read_index(r); |
| time(&now); |
| commit = alloc_commit_node(r); |
| commit->object.parsed = 1; |
| commit->date = now; |
| parent_tail = &commit->parents; |
| |
| parent_tail = append_parent(r, parent_tail, oid); |
| append_merge_parents(r, parent_tail); |
| verify_working_tree_path(r, commit, path); |
| |
| origin = make_origin(commit, path); |
| |
| if (contents_from) |
| ident = fmt_ident("External file (--contents)", "external.file", |
| WANT_BLANK_IDENT, NULL, 0); |
| else |
| ident = fmt_ident("Not Committed Yet", "not.committed.yet", |
| WANT_BLANK_IDENT, NULL, 0); |
| strbuf_addstr(&msg, "tree 0000000000000000000000000000000000000000\n"); |
| for (parent = commit->parents; parent; parent = parent->next) |
| strbuf_addf(&msg, "parent %s\n", |
| oid_to_hex(&parent->item->object.oid)); |
| strbuf_addf(&msg, |
| "author %s\n" |
| "committer %s\n\n" |
| "Version of %s from %s\n", |
| ident, ident, path, |
| (!contents_from ? path : |
| (!strcmp(contents_from, "-") ? "standard input" : contents_from))); |
| set_commit_buffer_from_strbuf(r, commit, &msg); |
| |
| if (!contents_from || strcmp("-", contents_from)) { |
| struct stat st; |
| const char *read_from; |
| char *buf_ptr; |
| unsigned long buf_len; |
| |
| if (contents_from) { |
| if (stat(contents_from, &st) < 0) |
| die_errno("Cannot stat '%s'", contents_from); |
| read_from = contents_from; |
| } |
| else { |
| if (lstat(path, &st) < 0) |
| die_errno("Cannot lstat '%s'", path); |
| read_from = path; |
| } |
| mode = canon_mode(st.st_mode); |
| |
| switch (st.st_mode & S_IFMT) { |
| case S_IFREG: |
| if (opt->flags.allow_textconv && |
| textconv_object(r, read_from, mode, null_oid(), 0, &buf_ptr, &buf_len)) |
| strbuf_attach(&buf, buf_ptr, buf_len, buf_len + 1); |
| else if (strbuf_read_file(&buf, read_from, st.st_size) != st.st_size) |
| die_errno("cannot open or read '%s'", read_from); |
| break; |
| case S_IFLNK: |
| if (strbuf_readlink(&buf, read_from, st.st_size) < 0) |
| die_errno("cannot readlink '%s'", read_from); |
| break; |
| default: |
| die("unsupported file type %s", read_from); |
| } |
| } |
| else { |
| /* Reading from stdin */ |
| mode = 0; |
| if (strbuf_read(&buf, 0, 0) < 0) |
| die_errno("failed to read from stdin"); |
| } |
| convert_to_git(r->index, path, buf.buf, buf.len, &buf, 0); |
| origin->file.ptr = buf.buf; |
| origin->file.size = buf.len; |
| pretend_object_file(buf.buf, buf.len, OBJ_BLOB, &origin->blob_oid); |
| |
| /* |
| * Read the current index, replace the path entry with |
| * origin->blob_sha1 without mucking with its mode or type |
| * bits; we are not going to write this index out -- we just |
| * want to run "diff-index --cached". |
| */ |
| discard_index(r->index); |
| repo_read_index(r); |
| |
| len = strlen(path); |
| if (!mode) { |
| int pos = index_name_pos(r->index, path, len); |
| if (0 <= pos) |
| mode = r->index->cache[pos]->ce_mode; |
| else |
| /* Let's not bother reading from HEAD tree */ |
| mode = S_IFREG | 0644; |
| } |
| ce = make_empty_cache_entry(r->index, len); |
| oidcpy(&ce->oid, &origin->blob_oid); |
| memcpy(ce->name, path, len); |
| ce->ce_flags = create_ce_flags(0); |
| ce->ce_namelen = len; |
| ce->ce_mode = create_ce_mode(mode); |
| add_index_entry(r->index, ce, |
| ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE); |
| |
| cache_tree_invalidate_path(r->index, path); |
| |
| return commit; |
| } |
| |
| |
| |
| static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b, |
| xdl_emit_hunk_consume_func_t hunk_func, void *cb_data, int xdl_opts) |
| { |
| xpparam_t xpp = {0}; |
| xdemitconf_t xecfg = {0}; |
| xdemitcb_t ecb = {NULL}; |
| |
| xpp.flags = xdl_opts; |
| xecfg.hunk_func = hunk_func; |
| ecb.priv = cb_data; |
| return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb); |
| } |
| |
| static const char *get_next_line(const char *start, const char *end) |
| { |
| const char *nl = memchr(start, '\n', end - start); |
| |
| return nl ? nl + 1 : end; |
| } |
| |
| static int find_line_starts(int **line_starts, const char *buf, |
| unsigned long len) |
| { |
| const char *end = buf + len; |
| const char *p; |
| int *lineno; |
| int num = 0; |
| |
| for (p = buf; p < end; p = get_next_line(p, end)) |
| num++; |
| |
| ALLOC_ARRAY(*line_starts, num + 1); |
| lineno = *line_starts; |
| |
| for (p = buf; p < end; p = get_next_line(p, end)) |
| *lineno++ = p - buf; |
| |
| *lineno = len; |
| |
| return num; |
| } |
| |
| struct fingerprint_entry; |
| |
| /* A fingerprint is intended to loosely represent a string, such that two |
| * fingerprints can be quickly compared to give an indication of the similarity |
| * of the strings that they represent. |
| * |
| * A fingerprint is represented as a multiset of the lower-cased byte pairs in |
| * the string that it represents. Whitespace is added at each end of the |
| * string. Whitespace pairs are ignored. Whitespace is converted to '\0'. |
| * For example, the string "Darth Radar" will be converted to the following |
| * fingerprint: |
| * {"\0d", "da", "da", "ar", "ar", "rt", "th", "h\0", "\0r", "ra", "ad", "r\0"} |
| * |
| * The similarity between two fingerprints is the size of the intersection of |
| * their multisets, including repeated elements. See fingerprint_similarity for |
| * examples. |
| * |
| * For ease of implementation, the fingerprint is implemented as a map |
| * of byte pairs to the count of that byte pair in the string, instead of |
| * allowing repeated elements in a set. |
| */ |
| struct fingerprint { |
| struct hashmap map; |
| /* As we know the maximum number of entries in advance, it's |
| * convenient to store the entries in a single array instead of having |
| * the hashmap manage the memory. |
| */ |
| struct fingerprint_entry *entries; |
| }; |
| |
| /* A byte pair in a fingerprint. Stores the number of times the byte pair |
| * occurs in the string that the fingerprint represents. |
| */ |
| struct fingerprint_entry { |
| /* The hashmap entry - the hash represents the byte pair in its |
| * entirety so we don't need to store the byte pair separately. |
| */ |
| struct hashmap_entry entry; |
| /* The number of times the byte pair occurs in the string that the |
| * fingerprint represents. |
| */ |
| int count; |
| }; |
| |
| /* See `struct fingerprint` for an explanation of what a fingerprint is. |
| * \param result the fingerprint of the string is stored here. This must be |
| * freed later using free_fingerprint. |
| * \param line_begin the start of the string |
| * \param line_end the end of the string |
| */ |
| static void get_fingerprint(struct fingerprint *result, |
| const char *line_begin, |
| const char *line_end) |
| { |
| unsigned int hash, c0 = 0, c1; |
| const char *p; |
| int max_map_entry_count = 1 + line_end - line_begin; |
| struct fingerprint_entry *entry = xcalloc(max_map_entry_count, |
| sizeof(struct fingerprint_entry)); |
| struct fingerprint_entry *found_entry; |
| |
| hashmap_init(&result->map, NULL, NULL, max_map_entry_count); |
| result->entries = entry; |
| for (p = line_begin; p <= line_end; ++p, c0 = c1) { |
| /* Always terminate the string with whitespace. |
| * Normalise whitespace to 0, and normalise letters to |
| * lower case. This won't work for multibyte characters but at |
| * worst will match some unrelated characters. |
| */ |
| if ((p == line_end) || isspace(*p)) |
| c1 = 0; |
| else |
| c1 = tolower(*p); |
| hash = c0 | (c1 << 8); |
| /* Ignore whitespace pairs */ |
| if (hash == 0) |
| continue; |
| hashmap_entry_init(&entry->entry, hash); |
| |
| found_entry = hashmap_get_entry(&result->map, entry, |
| /* member name */ entry, NULL); |
| if (found_entry) { |
| found_entry->count += 1; |
| } else { |
| entry->count = 1; |
| hashmap_add(&result->map, &entry->entry); |
| ++entry; |
| } |
| } |
| } |
| |
| static void free_fingerprint(struct fingerprint *f) |
| { |
| hashmap_clear(&f->map); |
| free(f->entries); |
| } |
| |
| /* Calculates the similarity between two fingerprints as the size of the |
| * intersection of their multisets, including repeated elements. See |
| * `struct fingerprint` for an explanation of the fingerprint representation. |
| * The similarity between "cat mat" and "father rather" is 2 because "at" is |
| * present twice in both strings while the similarity between "tim" and "mit" |
| * is 0. |
| */ |
| static int fingerprint_similarity(struct fingerprint *a, struct fingerprint *b) |
| { |
| int intersection = 0; |
| struct hashmap_iter iter; |
| const struct fingerprint_entry *entry_a, *entry_b; |
| |
| hashmap_for_each_entry(&b->map, &iter, entry_b, |
| entry /* member name */) { |
| entry_a = hashmap_get_entry(&a->map, entry_b, entry, NULL); |
| if (entry_a) { |
| intersection += entry_a->count < entry_b->count ? |
| entry_a->count : entry_b->count; |
| } |
| } |
| return intersection; |
| } |
| |
| /* Subtracts byte-pair elements in B from A, modifying A in place. |
| */ |
| static void fingerprint_subtract(struct fingerprint *a, struct fingerprint *b) |
| { |
| struct hashmap_iter iter; |
| struct fingerprint_entry *entry_a; |
| const struct fingerprint_entry *entry_b; |
| |
| hashmap_iter_init(&b->map, &iter); |
| |
| hashmap_for_each_entry(&b->map, &iter, entry_b, |
| entry /* member name */) { |
| entry_a = hashmap_get_entry(&a->map, entry_b, entry, NULL); |
| if (entry_a) { |
| if (entry_a->count <= entry_b->count) |
| hashmap_remove(&a->map, &entry_b->entry, NULL); |
| else |
| entry_a->count -= entry_b->count; |
| } |
| } |
| } |
| |
| /* Calculate fingerprints for a series of lines. |
| * Puts the fingerprints in the fingerprints array, which must have been |
| * preallocated to allow storing line_count elements. |
| */ |
| static void get_line_fingerprints(struct fingerprint *fingerprints, |
| const char *content, const int *line_starts, |
| long first_line, long line_count) |
| { |
| int i; |
| const char *linestart, *lineend; |
| |
| line_starts += first_line; |
| for (i = 0; i < line_count; ++i) { |
| linestart = content + line_starts[i]; |
| lineend = content + line_starts[i + 1]; |
| get_fingerprint(fingerprints + i, linestart, lineend); |
| } |
| } |
| |
| static void free_line_fingerprints(struct fingerprint *fingerprints, |
| int nr_fingerprints) |
| { |
| int i; |
| |
| for (i = 0; i < nr_fingerprints; i++) |
| free_fingerprint(&fingerprints[i]); |
| } |
| |
| /* This contains the data necessary to linearly map a line number in one half |
| * of a diff chunk to the line in the other half of the diff chunk that is |
| * closest in terms of its position as a fraction of the length of the chunk. |
| */ |
| struct line_number_mapping { |
| int destination_start, destination_length, |
| source_start, source_length; |
| }; |
| |
| /* Given a line number in one range, offset and scale it to map it onto the |
| * other range. |
| * Essentially this mapping is a simple linear equation but the calculation is |
| * more complicated to allow performing it with integer operations. |
| * Another complication is that if a line could map onto many lines in the |
| * destination range then we want to choose the line at the center of those |
| * possibilities. |
| * Example: if the chunk is 2 lines long in A and 10 lines long in B then the |
| * first 5 lines in B will map onto the first line in the A chunk, while the |
| * last 5 lines will all map onto the second line in the A chunk. |
| * Example: if the chunk is 10 lines long in A and 2 lines long in B then line |
| * 0 in B will map onto line 2 in A, and line 1 in B will map onto line 7 in A. |
| */ |
| static int map_line_number(int line_number, |
| const struct line_number_mapping *mapping) |
| { |
| return ((line_number - mapping->source_start) * 2 + 1) * |
| mapping->destination_length / |
| (mapping->source_length * 2) + |
| mapping->destination_start; |
| } |
| |
| /* Get a pointer to the element storing the similarity between a line in A |
| * and a line in B. |
| * |
| * The similarities are stored in a 2-dimensional array. Each "row" in the |
| * array contains the similarities for a line in B. The similarities stored in |
| * a row are the similarities between the line in B and the nearby lines in A. |
| * To keep the length of each row the same, it is padded out with values of -1 |
| * where the search range extends beyond the lines in A. |
| * For example, if max_search_distance_a is 2 and the two sides of a diff chunk |
| * look like this: |
| * a | m |
| * b | n |
| * c | o |
| * d | p |
| * e | q |
| * Then the similarity array will contain: |
| * [-1, -1, am, bm, cm, |
| * -1, an, bn, cn, dn, |
| * ao, bo, co, do, eo, |
| * bp, cp, dp, ep, -1, |
| * cq, dq, eq, -1, -1] |
| * Where similarities are denoted either by -1 for invalid, or the |
| * concatenation of the two lines in the diff being compared. |
| * |
| * \param similarities array of similarities between lines in A and B |
| * \param line_a the index of the line in A, in the same frame of reference as |
| * closest_line_a. |
| * \param local_line_b the index of the line in B, relative to the first line |
| * in B that similarities represents. |
| * \param closest_line_a the index of the line in A that is deemed to be |
| * closest to local_line_b. This must be in the same |
| * frame of reference as line_a. This value defines |
| * where similarities is centered for the line in B. |
| * \param max_search_distance_a maximum distance in lines from the closest line |
| * in A for other lines in A for which |
| * similarities may be calculated. |
| */ |
| static int *get_similarity(int *similarities, |
| int line_a, int local_line_b, |
| int closest_line_a, int max_search_distance_a) |
| { |
| assert(abs(line_a - closest_line_a) <= |
| max_search_distance_a); |
| return similarities + line_a - closest_line_a + |
| max_search_distance_a + |
| local_line_b * (max_search_distance_a * 2 + 1); |
| } |
| |
| #define CERTAIN_NOTHING_MATCHES -2 |
| #define CERTAINTY_NOT_CALCULATED -1 |
| |
| /* Given a line in B, first calculate its similarities with nearby lines in A |
| * if not already calculated, then identify the most similar and second most |
| * similar lines. The "certainty" is calculated based on those two |
| * similarities. |
| * |
| * \param start_a the index of the first line of the chunk in A |
| * \param length_a the length in lines of the chunk in A |
| * \param local_line_b the index of the line in B, relative to the first line |
| * in the chunk. |
| * \param fingerprints_a array of fingerprints for the chunk in A |
| * \param fingerprints_b array of fingerprints for the chunk in B |
| * \param similarities 2-dimensional array of similarities between lines in A |
| * and B. See get_similarity() for more details. |
| * \param certainties array of values indicating how strongly a line in B is |
| * matched with some line in A. |
| * \param second_best_result array of absolute indices in A for the second |
| * closest match of a line in B. |
| * \param result array of absolute indices in A for the closest match of a line |
| * in B. |
| * \param max_search_distance_a maximum distance in lines from the closest line |
| * in A for other lines in A for which |
| * similarities may be calculated. |
| * \param map_line_number_in_b_to_a parameter to map_line_number(). |
| */ |
| static void find_best_line_matches( |
| int start_a, |
| int length_a, |
| int start_b, |
| int local_line_b, |
| struct fingerprint *fingerprints_a, |
| struct fingerprint *fingerprints_b, |
| int *similarities, |
| int *certainties, |
| int *second_best_result, |
| int *result, |
| const int max_search_distance_a, |
| const struct line_number_mapping *map_line_number_in_b_to_a) |
| { |
| |
| int i, search_start, search_end, closest_local_line_a, *similarity, |
| best_similarity = 0, second_best_similarity = 0, |
| best_similarity_index = 0, second_best_similarity_index = 0; |
| |
| /* certainty has already been calculated so no need to redo the work */ |
| if (certainties[local_line_b] != CERTAINTY_NOT_CALCULATED) |
| return; |
| |
| closest_local_line_a = map_line_number( |
| local_line_b + start_b, map_line_number_in_b_to_a) - start_a; |
| |
| search_start = closest_local_line_a - max_search_distance_a; |
| if (search_start < 0) |
| search_start = 0; |
| |
| search_end = closest_local_line_a + max_search_distance_a + 1; |
| if (search_end > length_a) |
| search_end = length_a; |
| |
| for (i = search_start; i < search_end; ++i) { |
| similarity = get_similarity(similarities, |
| i, local_line_b, |
| closest_local_line_a, |
| max_search_distance_a); |
| if (*similarity == -1) { |
| /* This value will never exceed 10 but assert just in |
| * case |
| */ |
| assert(abs(i - closest_local_line_a) < 1000); |
| /* scale the similarity by (1000 - distance from |
| * closest line) to act as a tie break between lines |
| * that otherwise are equally similar. |
| */ |
| *similarity = fingerprint_similarity( |
| fingerprints_b + local_line_b, |
| fingerprints_a + i) * |
| (1000 - abs(i - closest_local_line_a)); |
| } |
| if (*similarity > best_similarity) { |
| second_best_similarity = best_similarity; |
| second_best_similarity_index = best_similarity_index; |
| best_similarity = *similarity; |
| best_similarity_index = i; |
| } else if (*similarity > second_best_similarity) { |
| second_best_similarity = *similarity; |
| second_best_similarity_index = i; |
| } |
| } |
| |
| if (best_similarity == 0) { |
| /* this line definitely doesn't match with anything. Mark it |
| * with this special value so it doesn't get invalidated and |
| * won't be recalculated. |
| */ |
| certainties[local_line_b] = CERTAIN_NOTHING_MATCHES; |
| result[local_line_b] = -1; |
| } else { |
| /* Calculate the certainty with which this line matches. |
| * If the line matches well with two lines then that reduces |
| * the certainty. However we still want to prioritise matching |
| * a line that matches very well with two lines over matching a |
| * line that matches poorly with one line, hence doubling |
| * best_similarity. |
| * This means that if we have |
| * line X that matches only one line with a score of 3, |
| * line Y that matches two lines equally with a score of 5, |
| * and line Z that matches only one line with a score or 2, |
| * then the lines in order of certainty are X, Y, Z. |
| */ |
| certainties[local_line_b] = best_similarity * 2 - |
| second_best_similarity; |
| |
| /* We keep both the best and second best results to allow us to |
| * check at a later stage of the matching process whether the |
| * result needs to be invalidated. |
| */ |
| result[local_line_b] = start_a + best_similarity_index; |
| second_best_result[local_line_b] = |
| start_a + second_best_similarity_index; |
| } |
| } |
| |
| /* |
| * This finds the line that we can match with the most confidence, and |
| * uses it as a partition. It then calls itself on the lines on either side of |
| * that partition. In this way we avoid lines appearing out of order, and |
| * retain a sensible line ordering. |
| * \param start_a index of the first line in A with which lines in B may be |
| * compared. |
| * \param start_b index of the first line in B for which matching should be |
| * done. |
| * \param length_a number of lines in A with which lines in B may be compared. |
| * \param length_b number of lines in B for which matching should be done. |
| * \param fingerprints_a mutable array of fingerprints in A. The first element |
| * corresponds to the line at start_a. |
| * \param fingerprints_b array of fingerprints in B. The first element |
| * corresponds to the line at start_b. |
| * \param similarities 2-dimensional array of similarities between lines in A |
| * and B. See get_similarity() for more details. |
| * \param certainties array of values indicating how strongly a line in B is |
| * matched with some line in A. |
| * \param second_best_result array of absolute indices in A for the second |
| * closest match of a line in B. |
| * \param result array of absolute indices in A for the closest match of a line |
| * in B. |
| * \param max_search_distance_a maximum distance in lines from the closest line |
| * in A for other lines in A for which |
| * similarities may be calculated. |
| * \param max_search_distance_b an upper bound on the greatest possible |
| * distance between lines in B such that they will |
| * both be compared with the same line in A |
| * according to max_search_distance_a. |
| * \param map_line_number_in_b_to_a parameter to map_line_number(). |
| */ |
| static void fuzzy_find_matching_lines_recurse( |
| int start_a, int start_b, |
| int length_a, int length_b, |
| struct fingerprint *fingerprints_a, |
| struct fingerprint *fingerprints_b, |
| int *similarities, |
| int *certainties, |
| int *second_best_result, |
| int *result, |
| int max_search_distance_a, |
| int max_search_distance_b, |
| const struct line_number_mapping *map_line_number_in_b_to_a) |
| { |
| int i, invalidate_min, invalidate_max, offset_b, |
| second_half_start_a, second_half_start_b, |
| second_half_length_a, second_half_length_b, |
| most_certain_line_a, most_certain_local_line_b = -1, |
| most_certain_line_certainty = -1, |
| closest_local_line_a; |
| |
| for (i = 0; i < length_b; ++i) { |
| find_best_line_matches(start_a, |
| length_a, |
| start_b, |
| i, |
| fingerprints_a, |
| fingerprints_b, |
| similarities, |
| certainties, |
| second_best_result, |
| result, |
| max_search_distance_a, |
| map_line_number_in_b_to_a); |
| |
| if (certainties[i] > most_certain_line_certainty) { |
| most_certain_line_certainty = certainties[i]; |
| most_certain_local_line_b = i; |
| } |
| } |
| |
| /* No matches. */ |
| if (most_certain_local_line_b == -1) |
| return; |
| |
| most_certain_line_a = result[most_certain_local_line_b]; |
| |
| /* |
| * Subtract the most certain line's fingerprint in B from the matched |
| * fingerprint in A. This means that other lines in B can't also match |
| * the same parts of the line in A. |
| */ |
| fingerprint_subtract(fingerprints_a + most_certain_line_a - start_a, |
| fingerprints_b + most_certain_local_line_b); |
| |
| /* Invalidate results that may be affected by the choice of most |
| * certain line. |
| */ |
| invalidate_min = most_certain_local_line_b - max_search_distance_b; |
| invalidate_max = most_certain_local_line_b + max_search_distance_b + 1; |
| if (invalidate_min < 0) |
| invalidate_min = 0; |
| if (invalidate_max > length_b) |
| invalidate_max = length_b; |
| |
| /* As the fingerprint in A has changed, discard previously calculated |
| * similarity values with that fingerprint. |
| */ |
| for (i = invalidate_min; i < invalidate_max; ++i) { |
| closest_local_line_a = map_line_number( |
| i + start_b, map_line_number_in_b_to_a) - start_a; |
| |
| /* Check that the lines in A and B are close enough that there |
| * is a similarity value for them. |
| */ |
| if (abs(most_certain_line_a - start_a - closest_local_line_a) > |
| max_search_distance_a) { |
| continue; |
| } |
| |
| *get_similarity(similarities, most_certain_line_a - start_a, |
| i, closest_local_line_a, |
| max_search_distance_a) = -1; |
| } |
| |
| /* More invalidating of results that may be affected by the choice of |
| * most certain line. |
| * Discard the matches for lines in B that are currently matched with a |
| * line in A such that their ordering contradicts the ordering imposed |
| * by the choice of most certain line. |
| */ |
| for (i = most_certain_local_line_b - 1; i >= invalidate_min; --i) { |
| /* In this loop we discard results for lines in B that are |
| * before most-certain-line-B but are matched with a line in A |
| * that is after most-certain-line-A. |
| */ |
| if (certainties[i] >= 0 && |
| (result[i] >= most_certain_line_a || |
| second_best_result[i] >= most_certain_line_a)) { |
| certainties[i] = CERTAINTY_NOT_CALCULATED; |
| } |
| } |
| for (i = most_certain_local_line_b + 1; i < invalidate_max; ++i) { |
| /* In this loop we discard results for lines in B that are |
| * after most-certain-line-B but are matched with a line in A |
| * that is before most-certain-line-A. |
| */ |
| if (certainties[i] >= 0 && |
| (result[i] <= most_certain_line_a || |
| second_best_result[i] <= most_certain_line_a)) { |
| certainties[i] = CERTAINTY_NOT_CALCULATED; |
| } |
| } |
| |
| /* Repeat the matching process for lines before the most certain line. |
| */ |
| if (most_certain_local_line_b > 0) { |
| fuzzy_find_matching_lines_recurse( |
| start_a, start_b, |
| most_certain_line_a + 1 - start_a, |
| most_certain_local_line_b, |
| fingerprints_a, fingerprints_b, similarities, |
| certainties, second_best_result, result, |
| max_search_distance_a, |
| max_search_distance_b, |
| map_line_number_in_b_to_a); |
| } |
| /* Repeat the matching process for lines after the most certain line. |
| */ |
| if (most_certain_local_line_b + 1 < length_b) { |
| second_half_start_a = most_certain_line_a; |
| offset_b = most_certain_local_line_b + 1; |
| second_half_start_b = start_b + offset_b; |
| second_half_length_a = |
| length_a + start_a - second_half_start_a; |
| second_half_length_b = |
| length_b + start_b - second_half_start_b; |
| fuzzy_find_matching_lines_recurse( |
| second_half_start_a, second_half_start_b, |
| second_half_length_a, second_half_length_b, |
| fingerprints_a + second_half_start_a - start_a, |
| fingerprints_b + offset_b, |
| similarities + |
| offset_b * (max_search_distance_a * 2 + 1), |
| certainties + offset_b, |
| second_best_result + offset_b, result + offset_b, |
| max_search_distance_a, |
| max_search_distance_b, |
| map_line_number_in_b_to_a); |
| } |
| } |
| |
| /* Find the lines in the parent line range that most closely match the lines in |
| * the target line range. This is accomplished by matching fingerprints in each |
| * blame_origin, and choosing the best matches that preserve the line ordering. |
| * See struct fingerprint for details of fingerprint matching, and |
| * fuzzy_find_matching_lines_recurse for details of preserving line ordering. |
| * |
| * The performance is believed to be O(n log n) in the typical case and O(n^2) |
| * in a pathological case, where n is the number of lines in the target range. |
| */ |
| static int *fuzzy_find_matching_lines(struct blame_origin *parent, |
| struct blame_origin *target, |
| int tlno, int parent_slno, int same, |
| int parent_len) |
| { |
| /* We use the terminology "A" for the left hand side of the diff AKA |
| * parent, and "B" for the right hand side of the diff AKA target. */ |
| int start_a = parent_slno; |
| int length_a = parent_len; |
| int start_b = tlno; |
| int length_b = same - tlno; |
| |
| struct line_number_mapping map_line_number_in_b_to_a = { |
| start_a, length_a, start_b, length_b |
| }; |
| |
| struct fingerprint *fingerprints_a = parent->fingerprints; |
| struct fingerprint *fingerprints_b = target->fingerprints; |
| |
| int i, *result, *second_best_result, |
| *certainties, *similarities, similarity_count; |
| |
| /* |
| * max_search_distance_a means that given a line in B, compare it to |
| * the line in A that is closest to its position, and the lines in A |
| * that are no greater than max_search_distance_a lines away from the |
| * closest line in A. |
| * |
| * max_search_distance_b is an upper bound on the greatest possible |
| * distance between lines in B such that they will both be compared |
| * with the same line in A according to max_search_distance_a. |
| */ |
| int max_search_distance_a = 10, max_search_distance_b; |
| |
| if (length_a <= 0) |
| return NULL; |
| |
| if (max_search_distance_a >= length_a) |
| max_search_distance_a = length_a ? length_a - 1 : 0; |
| |
| max_search_distance_b = ((2 * max_search_distance_a + 1) * length_b |
| - 1) / length_a; |
| |
| CALLOC_ARRAY(result, length_b); |
| CALLOC_ARRAY(second_best_result, length_b); |
| CALLOC_ARRAY(certainties, length_b); |
| |
| /* See get_similarity() for details of similarities. */ |
| similarity_count = length_b * (max_search_distance_a * 2 + 1); |
| CALLOC_ARRAY(similarities, similarity_count); |
| |
| for (i = 0; i < length_b; ++i) { |
| result[i] = -1; |
| second_best_result[i] = -1; |
| certainties[i] = CERTAINTY_NOT_CALCULATED; |
| } |
| |
| for (i = 0; i < similarity_count; ++i) |
| similarities[i] = -1; |
| |
| fuzzy_find_matching_lines_recurse(start_a, start_b, |
| length_a, length_b, |
| fingerprints_a + start_a, |
| fingerprints_b + start_b, |
| similarities, |
| certainties, |
| second_best_result, |
| result, |
| max_search_distance_a, |
| max_search_distance_b, |
| &map_line_number_in_b_to_a); |
| |
| free(similarities); |
| free(certainties); |
| free(second_best_result); |
| |
| return result; |
| } |
| |
| static void fill_origin_fingerprints(struct blame_origin *o) |
| { |
| int *line_starts; |
| |
| if (o->fingerprints) |
| return; |
| o->num_lines = find_line_starts(&line_starts, o->file.ptr, |
| o->file.size); |
| CALLOC_ARRAY(o->fingerprints, o->num_lines); |
| get_line_fingerprints(o->fingerprints, o->file.ptr, line_starts, |
| 0, o->num_lines); |
| free(line_starts); |
| } |
| |
| static void drop_origin_fingerprints(struct blame_origin *o) |
| { |
| if (o->fingerprints) { |
| free_line_fingerprints(o->fingerprints, o->num_lines); |
| o->num_lines = 0; |
| FREE_AND_NULL(o->fingerprints); |
| } |
| } |
| |
| /* |
| * Given an origin, prepare mmfile_t structure to be used by the |
| * diff machinery |
| */ |
| static void fill_origin_blob(struct diff_options *opt, |
| struct blame_origin *o, mmfile_t *file, |
| int *num_read_blob, int fill_fingerprints) |
| { |
| if (!o->file.ptr) { |
| enum object_type type; |
| unsigned long file_size; |
| |
| (*num_read_blob)++; |
| if (opt->flags.allow_textconv && |
| textconv_object(opt->repo, o->path, o->mode, |
| &o->blob_oid, 1, &file->ptr, &file_size)) |
| ; |
| else |
| file->ptr = repo_read_object_file(the_repository, |
| &o->blob_oid, &type, |
| &file_size); |
| file->size = file_size; |
| |
| if (!file->ptr) |
| die("Cannot read blob %s for path %s", |
| oid_to_hex(&o->blob_oid), |
| o->path); |
| o->file = *file; |
| } |
| else |
| *file = o->file; |
| if (fill_fingerprints) |
| fill_origin_fingerprints(o); |
| } |
| |
| static void drop_origin_blob(struct blame_origin *o) |
| { |
| FREE_AND_NULL(o->file.ptr); |
| drop_origin_fingerprints(o); |
| } |
| |
| /* |
| * Any merge of blames happens on lists of blames that arrived via |
| * different parents in a single suspect. In this case, we want to |
| * sort according to the suspect line numbers as opposed to the final |
| * image line numbers. The function body is somewhat longish because |
| * it avoids unnecessary writes. |
| */ |
| |
| static struct blame_entry *blame_merge(struct blame_entry *list1, |
| struct blame_entry *list2) |
| { |
| struct blame_entry *p1 = list1, *p2 = list2, |
| **tail = &list1; |
| |
| if (!p1) |
| return p2; |
| if (!p2) |
| return p1; |
| |
| if (p1->s_lno <= p2->s_lno) { |
| do { |
| tail = &p1->next; |
| if (!(p1 = *tail)) { |
| *tail = p2; |
| return list1; |
| } |
| } while (p1->s_lno <= p2->s_lno); |
| } |
| for (;;) { |
| *tail = p2; |
| do { |
| tail = &p2->next; |
| if (!(p2 = *tail)) { |
| *tail = p1; |
| return list1; |
| } |
| } while (p1->s_lno > p2->s_lno); |
| *tail = p1; |
| do { |
| tail = &p1->next; |
| if (!(p1 = *tail)) { |
| *tail = p2; |
| return list1; |
| } |
| } while (p1->s_lno <= p2->s_lno); |
| } |
| } |
| |
| DEFINE_LIST_SORT(static, sort_blame_entries, struct blame_entry, next); |
| |
| /* |
| * Final image line numbers are all different, so we don't need a |
| * three-way comparison here. |
| */ |
| |
| static int compare_blame_final(const struct blame_entry *e1, |
| const struct blame_entry *e2) |
| { |
| return e1->lno > e2->lno ? 1 : -1; |
| } |
| |
| static int compare_blame_suspect(const struct blame_entry *s1, |
| const struct blame_entry *s2) |
| { |
| /* |
| * to allow for collating suspects, we sort according to the |
| * respective pointer value as the primary sorting criterion. |
| * The actual relation is pretty unimportant as long as it |
| * establishes a total order. Comparing as integers gives us |
| * that. |
| */ |
| if (s1->suspect != s2->suspect) |
| return (intptr_t)s1->suspect > (intptr_t)s2->suspect ? 1 : -1; |
| if (s1->s_lno == s2->s_lno) |
| return 0; |
| return s1->s_lno > s2->s_lno ? 1 : -1; |
| } |
| |
| void blame_sort_final(struct blame_scoreboard *sb) |
| { |
| sort_blame_entries(&sb->ent, compare_blame_final); |
| } |
| |
| static int compare_commits_by_reverse_commit_date(const void *a, |
| const void *b, |
| void *c) |
| { |
| return -compare_commits_by_commit_date(a, b, c); |
| } |
| |
| /* |
| * For debugging -- origin is refcounted, and this asserts that |
| * we do not underflow. |
| */ |
| static void sanity_check_refcnt(struct blame_scoreboard *sb) |
| { |
| int baa = 0; |
| struct blame_entry *ent; |
| |
| for (ent = sb->ent; ent; ent = ent->next) { |
| /* Nobody should have zero or negative refcnt */ |
| if (ent->suspect->refcnt <= 0) { |
| fprintf(stderr, "%s in %s has negative refcnt %d\n", |
| ent->suspect->path, |
| oid_to_hex(&ent->suspect->commit->object.oid), |
| ent->suspect->refcnt); |
| baa = 1; |
| } |
| } |
| if (baa) |
| sb->on_sanity_fail(sb, baa); |
| } |
| |
| /* |
| * If two blame entries that are next to each other came from |
| * contiguous lines in the same origin (i.e. <commit, path> pair), |
| * merge them together. |
| */ |
| void blame_coalesce(struct blame_scoreboard *sb) |
| { |
| struct blame_entry *ent, *next; |
| |
| for (ent = sb->ent; ent && (next = ent->next); ent = next) { |
| if (ent->suspect == next->suspect && |
| ent->s_lno + ent->num_lines == next->s_lno && |
| ent->lno + ent->num_lines == next->lno && |
| ent->ignored == next->ignored && |
| ent->unblamable == next->unblamable) { |
| ent->num_lines += next->num_lines; |
| ent->next = next->next; |
| blame_origin_decref(next->suspect); |
| free(next); |
| ent->score = 0; |
| next = ent; /* again */ |
| } |
| } |
| |
| if (sb->debug) /* sanity */ |
| sanity_check_refcnt(sb); |
| } |
| |
| /* |
| * Merge the given sorted list of blames into a preexisting origin. |
| * If there were no previous blames to that commit, it is entered into |
| * the commit priority queue of the score board. |
| */ |
| |
| static void queue_blames(struct blame_scoreboard *sb, struct blame_origin *porigin, |
| struct blame_entry *sorted) |
| { |
| if (porigin->suspects) |
| porigin->suspects = blame_merge(porigin->suspects, sorted); |
| else { |
| struct blame_origin *o; |
| for (o = get_blame_suspects(porigin->commit); o; o = o->next) { |
| if (o->suspects) { |
| porigin->suspects = sorted; |
| return; |
| } |
| } |
| porigin->suspects = sorted; |
| prio_queue_put(&sb->commits, porigin->commit); |
| } |
| } |
| |
| /* |
| * Fill the blob_sha1 field of an origin if it hasn't, so that later |
| * call to fill_origin_blob() can use it to locate the data. blob_sha1 |
| * for an origin is also used to pass the blame for the entire file to |
| * the parent to detect the case where a child's blob is identical to |
| * that of its parent's. |
| * |
| * This also fills origin->mode for corresponding tree path. |
| */ |
| static int fill_blob_sha1_and_mode(struct repository *r, |
| struct blame_origin *origin) |
| { |
| if (!is_null_oid(&origin->blob_oid)) |
| return 0; |
| if (get_tree_entry(r, &origin->commit->object.oid, origin->path, &origin->blob_oid, &origin->mode)) |
| goto error_out; |
| if (oid_object_info(r, &origin->blob_oid, NULL) != OBJ_BLOB) |
| goto error_out; |
| return 0; |
| error_out: |
| oidclr(&origin->blob_oid, the_repository->hash_algo); |
| origin->mode = S_IFINVALID; |
| return -1; |
| } |
| |
| struct blame_bloom_data { |
| /* |
| * Changed-path Bloom filter keys. These can help prevent |
| * computing diffs against first parents, but we need to |
| * expand the list as code is moved or files are renamed. |
| */ |
| struct bloom_filter_settings *settings; |
| struct bloom_key **keys; |
| int nr; |
| int alloc; |
| }; |
| |
| static int bloom_count_queries = 0; |
| static int bloom_count_no = 0; |
| static int maybe_changed_path(struct repository *r, |
| struct blame_origin *origin, |
| struct blame_bloom_data *bd) |
| { |
| int i; |
| struct bloom_filter *filter; |
| |
| if (!bd) |
| return 1; |
| |
| if (commit_graph_generation(origin->commit) == GENERATION_NUMBER_INFINITY) |
| return 1; |
| |
| filter = get_bloom_filter(r, origin->commit); |
| |
| if (!filter) |
| return 1; |
| |
| bloom_count_queries++; |
| for (i = 0; i < bd->nr; i++) { |
| if (bloom_filter_contains(filter, |
| bd->keys[i], |
| bd->settings)) |
| return 1; |
| } |
| |
| bloom_count_no++; |
| return 0; |
| } |
| |
| static void add_bloom_key(struct blame_bloom_data *bd, |
| const char *path) |
| { |
| if (!bd) |
| return; |
| |
| if (bd->nr >= bd->alloc) { |
| bd->alloc *= 2; |
| REALLOC_ARRAY(bd->keys, bd->alloc); |
| } |
| |
| bd->keys[bd->nr] = xmalloc(sizeof(struct bloom_key)); |
| fill_bloom_key(path, strlen(path), bd->keys[bd->nr], bd->settings); |
| bd->nr++; |
| } |
| |
| /* |
| * We have an origin -- check if the same path exists in the |
| * parent and return an origin structure to represent it. |
| */ |
| static struct blame_origin *find_origin(struct repository *r, |
| struct commit *parent, |
| struct blame_origin *origin, |
| struct blame_bloom_data *bd) |
| { |
| struct blame_origin *porigin; |
| struct diff_options diff_opts; |
| const char *paths[2]; |
| |
| /* First check any existing origins */ |
| for (porigin = get_blame_suspects(parent); porigin; porigin = porigin->next) |
| if (!strcmp(porigin->path, origin->path)) { |
| /* |
| * The same path between origin and its parent |
| * without renaming -- the most common case. |
| */ |
| return blame_origin_incref (porigin); |
| } |
| |
| /* See if the origin->path is different between parent |
| * and origin first. Most of the time they are the |
| * same and diff-tree is fairly efficient about this. |
| */ |
| repo_diff_setup(r, &diff_opts); |
| diff_opts.flags.recursive = 1; |
| diff_opts.detect_rename = 0; |
| diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT; |
| paths[0] = origin->path; |
| paths[1] = NULL; |
| |
| parse_pathspec(&diff_opts.pathspec, |
| PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL, |
| PATHSPEC_LITERAL_PATH, "", paths); |
| diff_setup_done(&diff_opts); |
| |
| if (is_null_oid(&origin->commit->object.oid)) |
| do_diff_cache(get_commit_tree_oid(parent), &diff_opts); |
| else { |
| int compute_diff = 1; |
| if (origin->commit->parents && |
| oideq(&parent->object.oid, |
| &origin->commit->parents->item->object.oid)) |
| compute_diff = maybe_changed_path(r, origin, bd); |
| |
| if (compute_diff) |
| diff_tree_oid(get_commit_tree_oid(parent), |
| get_commit_tree_oid(origin->commit), |
| "", &diff_opts); |
| } |
| diffcore_std(&diff_opts); |
| |
| if (!diff_queued_diff.nr) { |
| /* The path is the same as parent */ |
| porigin = get_origin(parent, origin->path); |
| oidcpy(&porigin->blob_oid, &origin->blob_oid); |
| porigin->mode = origin->mode; |
| } else { |
| /* |
| * Since origin->path is a pathspec, if the parent |
| * commit had it as a directory, we will see a whole |
| * bunch of deletion of files in the directory that we |
| * do not care about. |
| */ |
| int i; |
| struct diff_filepair *p = NULL; |
| for (i = 0; i < diff_queued_diff.nr; i++) { |
| const char *name; |
| p = diff_queued_diff.queue[i]; |
| name = p->one->path ? p->one->path : p->two->path; |
| if (!strcmp(name, origin->path)) |
| break; |
| } |
| if (!p) |
| die("internal error in blame::find_origin"); |
| switch (p->status) { |
| default: |
| die("internal error in blame::find_origin (%c)", |
| p->status); |
| case 'M': |
| porigin = get_origin(parent, origin->path); |
| oidcpy(&porigin->blob_oid, &p->one->oid); |
| porigin->mode = p->one->mode; |
| break; |
| case 'A': |
| case 'T': |
| /* Did not exist in parent, or type changed */ |
| break; |
| } |
| } |
| diff_flush(&diff_opts); |
| return porigin; |
| } |
| |
| /* |
| * We have an origin -- find the path that corresponds to it in its |
| * parent and return an origin structure to represent it. |
| */ |
| static struct blame_origin *find_rename(struct repository *r, |
| struct commit *parent, |
| struct blame_origin *origin, |
| struct blame_bloom_data *bd) |
| { |
| struct blame_origin *porigin = NULL; |
| struct diff_options diff_opts; |
| int i; |
| |
| repo_diff_setup(r, &diff_opts); |
| diff_opts.flags.recursive = 1; |
| diff_opts.detect_rename = DIFF_DETECT_RENAME; |
| diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT; |
| diff_opts.single_follow = origin->path; |
| diff_setup_done(&diff_opts); |
| |
| if (is_null_oid(&origin->commit->object.oid)) |
| do_diff_cache(get_commit_tree_oid(parent), &diff_opts); |
| else |
| diff_tree_oid(get_commit_tree_oid(parent), |
| get_commit_tree_oid(origin->commit), |
| "", &diff_opts); |
| diffcore_std(&diff_opts); |
| |
| for (i = 0; i < diff_queued_diff.nr; i++) { |
| struct diff_filepair *p = diff_queued_diff.queue[i]; |
| if ((p->status == 'R' || p->status == 'C') && |
| !strcmp(p->two->path, origin->path)) { |
| add_bloom_key(bd, p->one->path); |
| porigin = get_origin(parent, p->one->path); |
| oidcpy(&porigin->blob_oid, &p->one->oid); |
| porigin->mode = p->one->mode; |
| break; |
| } |
| } |
| diff_flush(&diff_opts); |
| return porigin; |
| } |
| |
| /* |
| * Append a new blame entry to a given output queue. |
| */ |
| static void add_blame_entry(struct blame_entry ***queue, |
| const struct blame_entry *src) |
| { |
| struct blame_entry *e = xmalloc(sizeof(*e)); |
| memcpy(e, src, sizeof(*e)); |
| blame_origin_incref(e->suspect); |
| |
| e->next = **queue; |
| **queue = e; |
| *queue = &e->next; |
| } |
| |
| /* |
| * src typically is on-stack; we want to copy the information in it to |
| * a malloced blame_entry that gets added to the given queue. The |
| * origin of dst loses a refcnt. |
| */ |
| static void dup_entry(struct blame_entry ***queue, |
| struct blame_entry *dst, struct blame_entry *src) |
| { |
| blame_origin_incref(src->suspect); |
| blame_origin_decref(dst->suspect); |
| memcpy(dst, src, sizeof(*src)); |
| dst->next = **queue; |
| **queue = dst; |
| *queue = &dst->next; |
| } |
| |
| const char *blame_nth_line(struct blame_scoreboard *sb, long lno) |
| { |
| return sb->final_buf + sb->lineno[lno]; |
| } |
| |
| /* |
| * It is known that lines between tlno to same came from parent, and e |
| * has an overlap with that range. it also is known that parent's |
| * line plno corresponds to e's line tlno. |
| * |
| * <---- e -----> |
| * <------> |
| * <------------> |
| * <------------> |
| * <------------------> |
| * |
| * Split e into potentially three parts; before this chunk, the chunk |
| * to be blamed for the parent, and after that portion. |
| */ |
| static void split_overlap(struct blame_entry *split, |
| struct blame_entry *e, |
| int tlno, int plno, int same, |
| struct blame_origin *parent) |
| { |
| int chunk_end_lno; |
| int i; |
| memset(split, 0, sizeof(struct blame_entry [3])); |
| |
| for (i = 0; i < 3; i++) { |
| split[i].ignored = e->ignored; |
| split[i].unblamable = e->unblamable; |
| } |
| |
| if (e->s_lno < tlno) { |
| /* there is a pre-chunk part not blamed on parent */ |
| split[0].suspect = blame_origin_incref(e->suspect); |
| split[0].lno = e->lno; |
| split[0].s_lno = e->s_lno; |
| split[0].num_lines = tlno - e->s_lno; |
| split[1].lno = e->lno + tlno - e->s_lno; |
| split[1].s_lno = plno; |
| } |
| else { |
| split[1].lno = e->lno; |
| split[1].s_lno = plno + (e->s_lno - tlno); |
| } |
| |
| if (same < e->s_lno + e->num_lines) { |
| /* there is a post-chunk part not blamed on parent */ |
| split[2].suspect = blame_origin_incref(e->suspect); |
| split[2].lno = e->lno + (same - e->s_lno); |
| split[2].s_lno = e->s_lno + (same - e->s_lno); |
| split[2].num_lines = e->s_lno + e->num_lines - same; |
| chunk_end_lno = split[2].lno; |
| } |
| else |
| chunk_end_lno = e->lno + e->num_lines; |
| split[1].num_lines = chunk_end_lno - split[1].lno; |
| |
| /* |
| * if it turns out there is nothing to blame the parent for, |
| * forget about the splitting. !split[1].suspect signals this. |
| */ |
| if (split[1].num_lines < 1) |
| return; |
| split[1].suspect = blame_origin_incref(parent); |
| } |
| |
| /* |
| * split_overlap() divided an existing blame e into up to three parts |
| * in split. Any assigned blame is moved to queue to |
| * reflect the split. |
| */ |
| static void split_blame(struct blame_entry ***blamed, |
| struct blame_entry ***unblamed, |
| struct blame_entry *split, |
| struct blame_entry *e) |
| { |
| if (split[0].suspect && split[2].suspect) { |
| /* The first part (reuse storage for the existing entry e) */ |
| dup_entry(unblamed, e, &split[0]); |
| |
| /* The last part -- me */ |
| add_blame_entry(unblamed, &split[2]); |
| |
| /* ... and the middle part -- parent */ |
| add_blame_entry(blamed, &split[1]); |
| } |
| else if (!split[0].suspect && !split[2].suspect) |
| /* |
| * The parent covers the entire area; reuse storage for |
| * e and replace it with the parent. |
| */ |
| dup_entry(blamed, e, &split[1]); |
| else if (split[0].suspect) { |
| /* me and then parent */ |
| dup_entry(unblamed, e, &split[0]); |
| add_blame_entry(blamed, &split[1]); |
| } |
| else { |
| /* parent and then me */ |
| dup_entry(blamed, e, &split[1]); |
| add_blame_entry(unblamed, &split[2]); |
| } |
| } |
| |
| /* |
| * After splitting the blame, the origins used by the |
| * on-stack blame_entry should lose one refcnt each. |
| */ |
| static void decref_split(struct blame_entry *split) |
| { |
| int i; |
| |
| for (i = 0; i < 3; i++) |
| blame_origin_decref(split[i].suspect); |
| } |
| |
| /* |
| * reverse_blame reverses the list given in head, appending tail. |
| * That allows us to build lists in reverse order, then reverse them |
| * afterwards. This can be faster than building the list in proper |
| * order right away. The reason is that building in proper order |
| * requires writing a link in the _previous_ element, while building |
| * in reverse order just requires placing the list head into the |
| * _current_ element. |
| */ |
| |
| static struct blame_entry *reverse_blame(struct blame_entry *head, |
| struct blame_entry *tail) |
| { |
| while (head) { |
| struct blame_entry *next = head->next; |
| head->next = tail; |
| tail = head; |
| head = next; |
| } |
| return tail; |
| } |
| |
| /* |
| * Splits a blame entry into two entries at 'len' lines. The original 'e' |
| * consists of len lines, i.e. [e->lno, e->lno + len), and the second part, |
| * which is returned, consists of the remainder: [e->lno + len, e->lno + |
| * e->num_lines). The caller needs to sort out the reference counting for the |
| * new entry's suspect. |
| */ |
| static struct blame_entry *split_blame_at(struct blame_entry *e, int len, |
| struct blame_origin *new_suspect) |
| { |
| struct blame_entry *n = xcalloc(1, sizeof(struct blame_entry)); |
| |
| n->suspect = new_suspect; |
| n->ignored = e->ignored; |
| n->unblamable = e->unblamable; |
| n->lno = e->lno + len; |
| n->s_lno = e->s_lno + len; |
| n->num_lines = e->num_lines - len; |
| e->num_lines = len; |
| e->score = 0; |
| return n; |
| } |
| |
| struct blame_line_tracker { |
| int is_parent; |
| int s_lno; |
| }; |
| |
| static int are_lines_adjacent(struct blame_line_tracker *first, |
| struct blame_line_tracker *second) |
| { |
| return first->is_parent == second->is_parent && |
| first->s_lno + 1 == second->s_lno; |
| } |
| |
| static int scan_parent_range(struct fingerprint *p_fps, |
| struct fingerprint *t_fps, int t_idx, |
| int from, int nr_lines) |
| { |
| int sim, p_idx; |
| #define FINGERPRINT_FILE_THRESHOLD 10 |
| int best_sim_val = FINGERPRINT_FILE_THRESHOLD; |
| int best_sim_idx = -1; |
| |
| for (p_idx = from; p_idx < from + nr_lines; p_idx++) { |
| sim = fingerprint_similarity(&t_fps[t_idx], &p_fps[p_idx]); |
| if (sim < best_sim_val) |
| continue; |
| /* Break ties with the closest-to-target line number */ |
| if (sim == best_sim_val && best_sim_idx != -1 && |
| abs(best_sim_idx - t_idx) < abs(p_idx - t_idx)) |
| continue; |
| best_sim_val = sim; |
| best_sim_idx = p_idx; |
| } |
| return best_sim_idx; |
| } |
| |
| /* |
| * The first pass checks the blame entry (from the target) against the parent's |
| * diff chunk. If that fails for a line, the second pass tries to match that |
| * line to any part of parent file. That catches cases where a change was |
| * broken into two chunks by 'context.' |
| */ |
| static void guess_line_blames(struct blame_origin *parent, |
| struct blame_origin *target, |
| int tlno, int offset, int same, int parent_len, |
| struct blame_line_tracker *line_blames) |
| { |
| int i, best_idx, target_idx; |
| int parent_slno = tlno + offset; |
| int *fuzzy_matches; |
| |
| fuzzy_matches = fuzzy_find_matching_lines(parent, target, |
| tlno, parent_slno, same, |
| parent_len); |
| for (i = 0; i < same - tlno; i++) { |
| target_idx = tlno + i; |
| if (fuzzy_matches && fuzzy_matches[i] >= 0) { |
| best_idx = fuzzy_matches[i]; |
| } else { |
| best_idx = scan_parent_range(parent->fingerprints, |
| target->fingerprints, |
| target_idx, 0, |
| parent->num_lines); |
| } |
| if (best_idx >= 0) { |
| line_blames[i].is_parent = 1; |
| line_blames[i].s_lno = best_idx; |
| } else { |
| line_blames[i].is_parent = 0; |
| line_blames[i].s_lno = target_idx; |
| } |
| } |
| free(fuzzy_matches); |
| } |
| |
| /* |
| * This decides which parts of a blame entry go to the parent (added to the |
| * ignoredp list) and which stay with the target (added to the diffp list). The |
| * actual decision was made in a separate heuristic function, and those answers |
| * for the lines in 'e' are in line_blames. This consumes e, essentially |
| * putting it on a list. |
| * |
| * Note that the blame entries on the ignoredp list are not necessarily sorted |
| * with respect to the parent's line numbers yet. |
| */ |
| static void ignore_blame_entry(struct blame_entry *e, |
| struct blame_origin *parent, |
| struct blame_entry **diffp, |
| struct blame_entry **ignoredp, |
| struct blame_line_tracker *line_blames) |
| { |
| int entry_len, nr_lines, i; |
| |
| /* |
| * We carve new entries off the front of e. Each entry comes from a |
| * contiguous chunk of lines: adjacent lines from the same origin |
| * (either the parent or the target). |
| */ |
| entry_len = 1; |
| nr_lines = e->num_lines; /* e changes in the loop */ |
| for (i = 0; i < nr_lines; i++) { |
| struct blame_entry *next = NULL; |
| |
| /* |
| * We are often adjacent to the next line - only split the blame |
| * entry when we have to. |
| */ |
| if (i + 1 < nr_lines) { |
| if (are_lines_adjacent(&line_blames[i], |
| &line_blames[i + 1])) { |
| entry_len++; |
| continue; |
| } |
| next = split_blame_at(e, entry_len, |
| blame_origin_incref(e->suspect)); |
| } |
| if (line_blames[i].is_parent) { |
| e->ignored = 1; |
| blame_origin_decref(e->suspect); |
| e->suspect = blame_origin_incref(parent); |
| e->s_lno = line_blames[i - entry_len + 1].s_lno; |
| e->next = *ignoredp; |
| *ignoredp = e; |
| } else { |
| e->unblamable = 1; |
| /* e->s_lno is already in the target's address space. */ |
| e->next = *diffp; |
| *diffp = e; |
| } |
| assert(e->num_lines == entry_len); |
| e = next; |
| entry_len = 1; |
| } |
| assert(!e); |
| } |
| |
| /* |
| * Process one hunk from the patch between the current suspect for |
| * blame_entry e and its parent. This first blames any unfinished |
| * entries before the chunk (which is where target and parent start |
| * differing) on the parent, and then splits blame entries at the |
| * start and at the end of the difference region. Since use of -M and |
| * -C options may lead to overlapping/duplicate source line number |
| * ranges, all we can rely on from sorting/merging is the order of the |
| * first suspect line number. |
| * |
| * tlno: line number in the target where this chunk begins |
| * same: line number in the target where this chunk ends |
| * offset: add to tlno to get the chunk starting point in the parent |
| * parent_len: number of lines in the parent chunk |
| */ |
| static void blame_chunk(struct blame_entry ***dstq, struct blame_entry ***srcq, |
| int tlno, int offset, int same, int parent_len, |
| struct blame_origin *parent, |
| struct blame_origin *target, int ignore_diffs) |
| { |
| struct blame_entry *e = **srcq; |
| struct blame_entry *samep = NULL, *diffp = NULL, *ignoredp = NULL; |
| struct blame_line_tracker *line_blames = NULL; |
| |
| while (e && e->s_lno < tlno) { |
| struct blame_entry *next = e->next; |
| /* |
| * current record starts before differing portion. If |
| * it reaches into it, we need to split it up and |
| * examine the second part separately. |
| */ |
| if (e->s_lno + e->num_lines > tlno) { |
| /* Move second half to a new record */ |
| struct blame_entry *n; |
| |
| n = split_blame_at(e, tlno - e->s_lno, e->suspect); |
| /* Push new record to diffp */ |
| n->next = diffp; |
| diffp = n; |
| } else |
| blame_origin_decref(e->suspect); |
| /* Pass blame for everything before the differing |
| * chunk to the parent */ |
| e->suspect = blame_origin_incref(parent); |
| e->s_lno += offset; |
| e->next = samep; |
| samep = e; |
| e = next; |
| } |
| /* |
| * As we don't know how much of a common stretch after this |
| * diff will occur, the currently blamed parts are all that we |
| * can assign to the parent for now. |
| */ |
| |
| if (samep) { |
| **dstq = reverse_blame(samep, **dstq); |
| *dstq = &samep->next; |
| } |
| /* |
| * Prepend the split off portions: everything after e starts |
| * after the blameable portion. |
| */ |
| e = reverse_blame(diffp, e); |
| |
| /* |
| * Now retain records on the target while parts are different |
| * from the parent. |
| */ |
| samep = NULL; |
| diffp = NULL; |
| |
| if (ignore_diffs && same - tlno > 0) { |
| CALLOC_ARRAY(line_blames, same - tlno); |
| guess_line_blames(parent, target, tlno, offset, same, |
| parent_len, line_blames); |
| } |
| |
| while (e && e->s_lno < same) { |
| struct blame_entry *next = e->next; |
| |
| /* |
| * If current record extends into sameness, need to split. |
| */ |
| if (e->s_lno + e->num_lines > same) { |
| /* |
| * Move second half to a new record to be |
| * processed by later chunks |
| */ |
| struct blame_entry *n; |
| |
| n = split_blame_at(e, same - e->s_lno, |
| blame_origin_incref(e->suspect)); |
| /* Push new record to samep */ |
| n->next = samep; |
| samep = n; |
| } |
| if (ignore_diffs) { |
| ignore_blame_entry(e, parent, &diffp, &ignoredp, |
| line_blames + e->s_lno - tlno); |
| } else { |
| e->next = diffp; |
| diffp = e; |
| } |
| e = next; |
| } |
| free(line_blames); |
| if (ignoredp) { |
| /* |
| * Note ignoredp is not sorted yet, and thus neither is dstq. |
| * That list must be sorted before we queue_blames(). We defer |
| * sorting until after all diff hunks are processed, so that |
| * guess_line_blames() can pick *any* line in the parent. The |
| * slight drawback is that we end up sorting all blame entries |
| * passed to the parent, including those that are unrelated to |
| * changes made by the ignored commit. |
| */ |
| **dstq = reverse_blame(ignoredp, **dstq); |
| *dstq = &ignoredp->next; |
| } |
| **srcq = reverse_blame(diffp, reverse_blame(samep, e)); |
| /* Move across elements that are in the unblamable portion */ |
| if (diffp) |
| *srcq = &diffp->next; |
| } |
| |
| struct blame_chunk_cb_data { |
| struct blame_origin *parent; |
| struct blame_origin *target; |
| long offset; |
| int ignore_diffs; |
| struct blame_entry **dstq; |
| struct blame_entry **srcq; |
| }; |
| |
| /* diff chunks are from parent to target */ |
| static int blame_chunk_cb(long start_a, long count_a, |
| long start_b, long count_b, void *data) |
| { |
| struct blame_chunk_cb_data *d = data; |
| if (start_a - start_b != d->offset) |
| die("internal error in blame::blame_chunk_cb"); |
| blame_chunk(&d->dstq, &d->srcq, start_b, start_a - start_b, |
| start_b + count_b, count_a, d->parent, d->target, |
| d->ignore_diffs); |
| d->offset = start_a + count_a - (start_b + count_b); |
| return 0; |
| } |
| |
| /* |
| * We are looking at the origin 'target' and aiming to pass blame |
| * for the lines it is suspected to its parent. Run diff to find |
| * which lines came from parent and pass blame for them. |
| */ |
| static void pass_blame_to_parent(struct blame_scoreboard *sb, |
| struct blame_origin *target, |
| struct blame_origin *parent, int ignore_diffs) |
| { |
| mmfile_t file_p, file_o; |
| struct blame_chunk_cb_data d; |
| struct blame_entry *newdest = NULL; |
| |
| if (!target->suspects) |
| return; /* nothing remains for this target */ |
| |
| d.parent = parent; |
| d.target = target; |
| d.offset = 0; |
| d.ignore_diffs = ignore_diffs; |
| d.dstq = &newdest; d.srcq = &target->suspects; |
| |
| fill_origin_blob(&sb->revs->diffopt, parent, &file_p, |
| &sb->num_read_blob, ignore_diffs); |
| fill_origin_blob(&sb->revs->diffopt, target, &file_o, |
| &sb->num_read_blob, ignore_diffs); |
| sb->num_get_patch++; |
| |
| if (diff_hunks(&file_p, &file_o, blame_chunk_cb, &d, sb->xdl_opts)) |
| die("unable to generate diff (%s -> %s)", |
| oid_to_hex(&parent->commit->object.oid), |
| oid_to_hex(&target->commit->object.oid)); |
| /* The rest are the same as the parent */ |
| blame_chunk(&d.dstq, &d.srcq, INT_MAX, d.offset, INT_MAX, 0, |
| parent, target, 0); |
| *d.dstq = NULL; |
| if (ignore_diffs) |
| sort_blame_entries(&newdest, compare_blame_suspect); |
| queue_blames(sb, parent, newdest); |
| |
| return; |
| } |
| |
| /* |
| * The lines in blame_entry after splitting blames many times can become |
| * very small and trivial, and at some point it becomes pointless to |
| * blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any |
| * ordinary C program, and it is not worth to say it was copied from |
| * totally unrelated file in the parent. |
| * |
| * Compute how trivial the lines in the blame_entry are. |
| */ |
| unsigned blame_entry_score(struct blame_scoreboard *sb, struct blame_entry *e) |
| { |
| unsigned score; |
| const char *cp, *ep; |
| |
| if (e->score) |
| return e->score; |
| |
| score = 1; |
| cp = blame_nth_line(sb, e->lno); |
| ep = blame_nth_line(sb, e->lno + e->num_lines); |
| while (cp < ep) { |
| unsigned ch = *((unsigned char *)cp); |
| if (isalnum(ch)) |
| score++; |
| cp++; |
| } |
| e->score = score; |
| return score; |
| } |
| |
| /* |
| * best_so_far[] and potential[] are both a split of an existing blame_entry |
| * that passes blame to the parent. Maintain best_so_far the best split so |
| * far, by comparing potential and best_so_far and copying potential into |
| * bst_so_far as needed. |
| */ |
| static void copy_split_if_better(struct blame_scoreboard *sb, |
| struct blame_entry *best_so_far, |
| struct blame_entry *potential) |
| { |
| int i; |
| |
| if (!potential[1].suspect) |
| return; |
| if (best_so_far[1].suspect) { |
| if (blame_entry_score(sb, &potential[1]) < |
| blame_entry_score(sb, &best_so_far[1])) |
| return; |
| } |
| |
| for (i = 0; i < 3; i++) |
| blame_origin_incref(potential[i].suspect); |
| decref_split(best_so_far); |
| memcpy(best_so_far, potential, sizeof(struct blame_entry[3])); |
| } |
| |
| /* |
| * We are looking at a part of the final image represented by |
| * ent (tlno and same are offset by ent->s_lno). |
| * tlno is where we are looking at in the final image. |
| * up to (but not including) same match preimage. |
| * plno is where we are looking at in the preimage. |
| * |
| * <-------------- final image ----------------------> |
| * <------ent------> |
| * ^tlno ^same |
| * <---------preimage-----> |
| * ^plno |
| * |
| * All line numbers are 0-based. |
| */ |
| static void handle_split(struct blame_scoreboard *sb, |
| struct blame_entry *ent, |
| int tlno, int plno, int same, |
| struct blame_origin *parent, |
| struct blame_entry *split) |
| { |
| if (ent->num_lines <= tlno) |
| return; |
| if (tlno < same) { |
| struct blame_entry potential[3]; |
| tlno += ent->s_lno; |
| same += ent->s_lno; |
| split_overlap(potential, ent, tlno, plno, same, parent); |
| copy_split_if_better(sb, split, potential); |
| decref_split(potential); |
| } |
| } |
| |
| struct handle_split_cb_data { |
| struct blame_scoreboard *sb; |
| struct blame_entry *ent; |
| struct blame_origin *parent; |
| struct blame_entry *split; |
| long plno; |
| long tlno; |
| }; |
| |
| static int handle_split_cb(long start_a, long count_a, |
| long start_b, long count_b, void *data) |
| { |
| struct handle_split_cb_data *d = data; |
| handle_split(d->sb, d->ent, d->tlno, d->plno, start_b, d->parent, |
| d->split); |
| d->plno = start_a + count_a; |
| d->tlno = start_b + count_b; |
| return 0; |
| } |
| |
| /* |
| * Find the lines from parent that are the same as ent so that |
| * we can pass blames to it. file_p has the blob contents for |
| * the parent. |
| */ |
| static void find_copy_in_blob(struct blame_scoreboard *sb, |
| struct blame_entry *ent, |
| struct blame_origin *parent, |
| struct blame_entry *split, |
| mmfile_t *file_p) |
| { |
| const char *cp; |
| mmfile_t file_o; |
| struct handle_split_cb_data d; |
| |
| memset(&d, 0, sizeof(d)); |
| d.sb = sb; d.ent = ent; d.parent = parent; d.split = split; |
| /* |
| * Prepare mmfile that contains only the lines in ent. |
| */ |
| cp = blame_nth_line(sb, ent->lno); |
| file_o.ptr = (char *) cp; |
| file_o.size = blame_nth_line(sb, ent->lno + ent->num_lines) - cp; |
| |
| /* |
| * file_o is a part of final image we are annotating. |
| * file_p partially may match that image. |
| */ |
| memset(split, 0, sizeof(struct blame_entry [3])); |
| if (diff_hunks(file_p, &file_o, handle_split_cb, &d, sb->xdl_opts)) |
| die("unable to generate diff (%s)", |
| oid_to_hex(&parent->commit->object.oid)); |
| /* remainder, if any, all match the preimage */ |
| handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split); |
| } |
| |
| /* Move all blame entries from list *source that have a score smaller |
| * than score_min to the front of list *small. |
| * Returns a pointer to the link pointing to the old head of the small list. |
| */ |
| |
| static struct blame_entry **filter_small(struct blame_scoreboard *sb, |
| struct blame_entry **small, |
| struct blame_entry **source, |
| unsigned score_min) |
| { |
| struct blame_entry *p = *source; |
| struct blame_entry *oldsmall = *small; |
| while (p) { |
| if (blame_entry_score(sb, p) <= score_min) { |
| *small = p; |
| small = &p->next; |
| p = *small; |
| } else { |
| *source = p; |
| source = &p->next; |
| p = *source; |
| } |
| } |
| *small = oldsmall; |
| *source = NULL; |
| return small; |
| } |
| |
| /* |
| * See if lines currently target is suspected for can be attributed to |
| * parent. |
| */ |
| static void find_move_in_parent(struct blame_scoreboard *sb, |
| struct blame_entry ***blamed, |
| struct blame_entry **toosmall, |
| struct blame_origin *target, |
| struct blame_origin *parent) |
| { |
| struct blame_entry *e, split[3]; |
| struct blame_entry *unblamed = target->suspects; |
| struct blame_entry *leftover = NULL; |
| mmfile_t file_p; |
| |
| if (!unblamed) |
| return; /* nothing remains for this target */ |
| |
| fill_origin_blob(&sb->revs->diffopt, parent, &file_p, |
| &sb->num_read_blob, 0); |
| if (!file_p.ptr) |
| return; |
| |
| /* At each iteration, unblamed has a NULL-terminated list of |
| * entries that have not yet been tested for blame. leftover |
| * contains the reversed list of entries that have been tested |
| * without being assignable to the parent. |
| */ |
| do { |
| struct blame_entry **unblamedtail = &unblamed; |
| struct blame_entry *next; |
| for (e = unblamed; e; e = next) { |
| next = e->next; |
| find_copy_in_blob(sb, e, parent, split, &file_p); |
| if (split[1].suspect && |
| sb->move_score < blame_entry_score(sb, &split[1])) { |
| split_blame(blamed, &unblamedtail, split, e); |
| } else { |
| e->next = leftover; |
| leftover = e; |
| } |
| decref_split(split); |
| } |
| *unblamedtail = NULL; |
| toosmall = filter_small(sb, toosmall, &unblamed, sb->move_score); |
| } while (unblamed); |
| target->suspects = reverse_blame(leftover, NULL); |
| } |
| |
| struct blame_list { |
| struct blame_entry *ent; |
| struct blame_entry split[3]; |
| }; |
| |
| /* |
| * Count the number of entries the target is suspected for, |
| * and prepare a list of entry and the best split. |
| */ |
| static struct blame_list *setup_blame_list(struct blame_entry *unblamed, |
| int *num_ents_p) |
| { |
| struct blame_entry *e; |
| int num_ents, i; |
| struct blame_list *blame_list = NULL; |
| |
| for (e = unblamed, num_ents = 0; e; e = e->next) |
| num_ents++; |
| if (num_ents) { |
| CALLOC_ARRAY(blame_list, num_ents); |
| for (e = unblamed, i = 0; e; e = e->next) |
| blame_list[i++].ent = e; |
| } |
| *num_ents_p = num_ents; |
| return blame_list; |
| } |
| |
| /* |
| * For lines target is suspected for, see if we can find code movement |
| * across file boundary from the parent commit. porigin is the path |
| * in the parent we already tried. |
| */ |
| static void find_copy_in_parent(struct blame_scoreboard *sb, |
| struct blame_entry ***blamed, |
| struct blame_entry **toosmall, |
| struct blame_origin *target, |
| struct commit *parent, |
| struct blame_origin *porigin, |
| int opt) |
| { |
| struct diff_options diff_opts; |
| int i, j; |
| struct blame_list *blame_list; |
| int num_ents; |
| struct blame_entry *unblamed = target->suspects; |
| struct blame_entry *leftover = NULL; |
| |
| if (!unblamed) |
| return; /* nothing remains for this target */ |
| |
| repo_diff_setup(sb->repo, &diff_opts); |
| diff_opts.flags.recursive = 1; |
| diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT; |
| |
| diff_setup_done(&diff_opts); |
| |
| /* Try "find copies harder" on new path if requested; |
| * we do not want to use diffcore_rename() actually to |
| * match things up; find_copies_harder is set only to |
| * force diff_tree_oid() to feed all filepairs to diff_queue, |
| * and this code needs to be after diff_setup_done(), which |
| * usually makes find-copies-harder imply copy detection. |
| */ |
| if ((opt & PICKAXE_BLAME_COPY_HARDEST) |
| || ((opt & PICKAXE_BLAME_COPY_HARDER) |
| && (!porigin || strcmp(target->path, porigin->path)))) |
| diff_opts.flags.find_copies_harder = 1; |
| |
| if (is_null_oid(&target->commit->object.oid)) |
| do_diff_cache(get_commit_tree_oid(parent), &diff_opts); |
| else |
| diff_tree_oid(get_commit_tree_oid(parent), |
| get_commit_tree_oid(target->commit), |
| "", &diff_opts); |
| |
| if (!diff_opts.flags.find_copies_harder) |
| diffcore_std(&diff_opts); |
| |
| do { |
| struct blame_entry **unblamedtail = &unblamed; |
| blame_list = setup_blame_list(unblamed, &num_ents); |
| |
| for (i = 0; i < diff_queued_diff.nr; i++) { |
| struct diff_filepair *p = diff_queued_diff.queue[i]; |
| struct blame_origin *norigin; |
| mmfile_t file_p; |
| struct blame_entry potential[3]; |
| |
| if (!DIFF_FILE_VALID(p->one)) |
| continue; /* does not exist in parent */ |
| if (S_ISGITLINK(p->one->mode)) |
| continue; /* ignore git links */ |
| if (porigin && !strcmp(p->one->path, porigin->path)) |
| /* find_move already dealt with this path */ |
| continue; |
| |
| norigin = get_origin(parent, p->one->path); |
| oidcpy(&norigin->blob_oid, &p->one->oid); |
| norigin->mode = p->one->mode; |
| fill_origin_blob(&sb->revs->diffopt, norigin, &file_p, |
| &sb->num_read_blob, 0); |
| if (!file_p.ptr) |
| continue; |
| |
| for (j = 0; j < num_ents; j++) { |
| find_copy_in_blob(sb, blame_list[j].ent, |
| norigin, potential, &file_p); |
| copy_split_if_better(sb, blame_list[j].split, |
| potential); |
| decref_split(potential); |
| } |
| blame_origin_decref(norigin); |
| } |
| |
| for (j = 0; j < num_ents; j++) { |
| struct blame_entry *split = blame_list[j].split; |
| if (split[1].suspect && |
| sb->copy_score < blame_entry_score(sb, &split[1])) { |
| split_blame(blamed, &unblamedtail, split, |
| blame_list[j].ent); |
| } else { |
| blame_list[j].ent->next = leftover; |
| leftover = blame_list[j].ent; |
| } |
| decref_split(split); |
| } |
| free(blame_list); |
| *unblamedtail = NULL; |
| toosmall = filter_small(sb, toosmall, &unblamed, sb->copy_score); |
| } while (unblamed); |
| target->suspects = reverse_blame(leftover, NULL); |
| diff_flush(&diff_opts); |
| } |
| |
| /* |
| * The blobs of origin and porigin exactly match, so everything |
| * origin is suspected for can be blamed on the parent. |
| */ |
| static void pass_whole_blame(struct blame_scoreboard *sb, |
| struct blame_origin *origin, struct blame_origin *porigin) |
| { |
| struct blame_entry *e, *suspects; |
| |
| if (!porigin->file.ptr && origin->file.ptr) { |
| /* Steal its file */ |
| porigin->file = origin->file; |
| origin->file.ptr = NULL; |
| } |
| suspects = origin->suspects; |
| origin->suspects = NULL; |
| for (e = suspects; e; e = e->next) { |
| blame_origin_incref(porigin); |
| blame_origin_decref(e->suspect); |
| e->suspect = porigin; |
| } |
| queue_blames(sb, porigin, suspects); |
| } |
| |
| /* |
| * We pass blame from the current commit to its parents. We keep saying |
| * "parent" (and "porigin"), but what we mean is to find scapegoat to |
| * exonerate ourselves. |
| */ |
| static struct commit_list *first_scapegoat(struct rev_info *revs, struct commit *commit, |
| int reverse) |
| { |
| if (!reverse) { |
| if (revs->first_parent_only && |
| commit->parents && |
| commit->parents->next) { |
| free_commit_list(commit->parents->next); |
| commit->parents->next = NULL; |
| } |
| return commit->parents; |
| } |
| return lookup_decoration(&revs->children, &commit->object); |
| } |
| |
| static int num_scapegoats(struct rev_info *revs, struct commit *commit, int reverse) |
| { |
| struct commit_list *l = first_scapegoat(revs, commit, reverse); |
| return commit_list_count(l); |
| } |
| |
| /* Distribute collected unsorted blames to the respected sorted lists |
| * in the various origins. |
| */ |
| static void distribute_blame(struct blame_scoreboard *sb, struct blame_entry *blamed) |
| { |
| sort_blame_entries(&blamed, compare_blame_suspect); |
| while (blamed) |
| { |
| struct blame_origin *porigin = blamed->suspect; |
| struct blame_entry *suspects = NULL; |
| do { |
| struct blame_entry *next = blamed->next; |
| blamed->next = suspects; |
| suspects = blamed; |
| blamed = next; |
| } while (blamed && blamed->suspect == porigin); |
| suspects = reverse_blame(suspects, NULL); |
| queue_blames(sb, porigin, suspects); |
| } |
| } |
| |
| #define MAXSG 16 |
| |
| typedef struct blame_origin *(*blame_find_alg)(struct repository *, |
| struct commit *, |
| struct blame_origin *, |
| struct blame_bloom_data *); |
| |
| static void pass_blame(struct blame_scoreboard *sb, struct blame_origin *origin, int opt) |
| { |
| struct rev_info *revs = sb->revs; |
| int i, pass, num_sg; |
| struct commit *commit = origin->commit; |
| struct commit_list *sg; |
| struct blame_origin *sg_buf[MAXSG]; |
| struct blame_origin *porigin, **sg_origin = sg_buf; |
| struct blame_entry *toosmall = NULL; |
| struct blame_entry *blames, **blametail = &blames; |
| |
| num_sg = num_scapegoats(revs, commit, sb->reverse); |
| if (!num_sg) |
| goto finish; |
| else if (num_sg < ARRAY_SIZE(sg_buf)) |
| memset(sg_buf, 0, sizeof(sg_buf)); |
| else |
| CALLOC_ARRAY(sg_origin, num_sg); |
| |
| /* |
| * The first pass looks for unrenamed path to optimize for |
| * common cases, then we look for renames in the second pass. |
| */ |
| for (pass = 0; pass < 2 - sb->no_whole_file_rename; pass++) { |
| blame_find_alg find = pass ? find_rename : find_origin; |
| |
| for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse); |
| i < num_sg && sg; |
| sg = sg->next, i++) { |
| struct commit *p = sg->item; |
| int j, same; |
| |
| if (sg_origin[i]) |
| continue; |
| if (repo_parse_commit(the_repository, p)) |
| continue; |
| porigin = find(sb->repo, p, origin, sb->bloom_data); |
| if (!porigin) |
| continue; |
| if (oideq(&porigin->blob_oid, &origin->blob_oid)) { |
| pass_whole_blame(sb, origin, porigin); |
| blame_origin_decref(porigin); |
| goto finish; |
| } |
| for (j = same = 0; j < i; j++) |
| if (sg_origin[j] && |
| oideq(&sg_origin[j]->blob_oid, &porigin->blob_oid)) { |
| same = 1; |
| break; |
| } |
| if (!same) |
| sg_origin[i] = porigin; |
| else |
| blame_origin_decref(porigin); |
| } |
| } |
| |
| sb->num_commits++; |
| for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse); |
| i < num_sg && sg; |
| sg = sg->next, i++) { |
| struct blame_origin *porigin = sg_origin[i]; |
| if (!porigin) |
| continue; |
| if (!origin->previous) { |
| blame_origin_incref(porigin); |
| origin->previous = porigin; |
| } |
| pass_blame_to_parent(sb, origin, porigin, 0); |
| if (!origin->suspects) |
| goto finish; |
| } |
| |
| /* |
| * Pass remaining suspects for ignored commits to their parents. |
| */ |
| if (oidset_contains(&sb->ignore_list, &commit->object.oid)) { |
| for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse); |
| i < num_sg && sg; |
| sg = sg->next, i++) { |
| struct blame_origin *porigin = sg_origin[i]; |
| |
| if (!porigin) |
| continue; |
| pass_blame_to_parent(sb, origin, porigin, 1); |
| /* |
| * Preemptively drop porigin so we can refresh the |
| * fingerprints if we use the parent again, which can |
| * occur if you ignore back-to-back commits. |
| */ |
| drop_origin_blob(porigin); |
| if (!origin->suspects) |
| goto finish; |
| } |
| } |
| |
| /* |
| * Optionally find moves in parents' files. |
| */ |
| if (opt & PICKAXE_BLAME_MOVE) { |
| filter_small(sb, &toosmall, &origin->suspects, sb->move_score); |
| if (origin->suspects) { |
| for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse); |
| i < num_sg && sg; |
| sg = sg->next, i++) { |
| struct blame_origin *porigin = sg_origin[i]; |
| if (!porigin) |
| continue; |
| find_move_in_parent(sb, &blametail, &toosmall, origin, porigin); |
| if (!origin->suspects) |
| break; |
| } |
| } |
| } |
| |
| /* |
| * Optionally find copies from parents' files. |
| */ |
| if (opt & PICKAXE_BLAME_COPY) { |
| if (sb->copy_score > sb->move_score) |
| filter_small(sb, &toosmall, &origin->suspects, sb->copy_score); |
| else if (sb->copy_score < sb->move_score) { |
| origin->suspects = blame_merge(origin->suspects, toosmall); |
| toosmall = NULL; |
| filter_small(sb, &toosmall, &origin->suspects, sb->copy_score); |
| } |
| if (!origin->suspects) |
| goto finish; |
| |
| for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse); |
| i < num_sg && sg; |
| sg = sg->next, i++) { |
| struct blame_origin *porigin = sg_origin[i]; |
| find_copy_in_parent(sb, &blametail, &toosmall, |
| origin, sg->item, porigin, opt); |
| if (!origin->suspects) |
| goto finish; |
| } |
| } |
| |
| finish: |
| *blametail = NULL; |
| distribute_blame(sb, blames); |
| /* |
| * prepend toosmall to origin->suspects |
| * |
| * There is no point in sorting: this ends up on a big |
| * unsorted list in the caller anyway. |
| */ |
| if (toosmall) { |
| struct blame_entry **tail = &toosmall; |
| while (*tail) |
| tail = &(*tail)->next; |
| *tail = origin->suspects; |
| origin->suspects = toosmall; |
| } |
| for (i = 0; i < num_sg; i++) { |
| if (sg_origin[i]) { |
| if (!sg_origin[i]->suspects) |
| drop_origin_blob(sg_origin[i]); |
| blame_origin_decref(sg_origin[i]); |
| } |
| } |
| drop_origin_blob(origin); |
| if (sg_buf != sg_origin) |
| free(sg_origin); |
| } |
| |
| /* |
| * The main loop -- while we have blobs with lines whose true origin |
| * is still unknown, pick one blob, and allow its lines to pass blames |
| * to its parents. */ |
| void assign_blame(struct blame_scoreboard *sb, int opt) |
| { |
| struct rev_info *revs = sb->revs; |
| struct commit *commit = prio_queue_get(&sb->commits); |
| |
| while (commit) { |
| struct blame_entry *ent; |
| struct blame_origin *suspect = get_blame_suspects(commit); |
| |
| /* find one suspect to break down */ |
| while (suspect && !suspect->suspects) |
| suspect = suspect->next; |
| |
| if (!suspect) { |
| commit = prio_queue_get(&sb->commits); |
| continue; |
| } |
| |
| assert(commit == suspect->commit); |
| |
| /* |
| * We will use this suspect later in the loop, |
| * so hold onto it in the meantime. |
| */ |
| blame_origin_incref(suspect); |
| repo_parse_commit(the_repository, commit); |
| if (sb->reverse || |
| (!(commit->object.flags & UNINTERESTING) && |
| !(revs->max_age != -1 && commit->date < revs->max_age))) |
| pass_blame(sb, suspect, opt); |
| else { |
| commit->object.flags |= UNINTERESTING; |
| if (commit->object.parsed) |
| mark_parents_uninteresting(sb->revs, commit); |
| } |
| /* treat root commit as boundary */ |
| if (!commit->parents && !sb->show_root) |
| commit->object.flags |= UNINTERESTING; |
| |
| /* Take responsibility for the remaining entries */ |
| ent = suspect->suspects; |
| if (ent) { |
| suspect->guilty = 1; |
| for (;;) { |
| struct blame_entry *next = ent->next; |
| if (sb->found_guilty_entry) |
| sb->found_guilty_entry(ent, sb->found_guilty_entry_data); |
| if (next) { |
| ent = next; |
| continue; |
| } |
| ent->next = sb->ent; |
| sb->ent = suspect->suspects; |
| suspect->suspects = NULL; |
| break; |
| } |
| } |
| blame_origin_decref(suspect); |
| |
| if (sb->debug) /* sanity */ |
| sanity_check_refcnt(sb); |
| } |
| } |
| |
| /* |
| * To allow quick access to the contents of nth line in the |
| * final image, prepare an index in the scoreboard. |
| */ |
| static int prepare_lines(struct blame_scoreboard *sb) |
| { |
| sb->num_lines = find_line_starts(&sb->lineno, sb->final_buf, |
| sb->final_buf_size); |
| return sb->num_lines; |
| } |
| |
| static struct commit *find_single_final(struct rev_info *revs, |
| const char **name_p) |
| { |
| int i; |
| struct commit *found = NULL; |
| const char *name = NULL; |
| |
| for (i = 0; i < revs->pending.nr; i++) { |
| struct object *obj = revs->pending.objects[i].item; |
| if (obj->flags & UNINTERESTING) |
| continue; |
| obj = deref_tag(revs->repo, obj, NULL, 0); |
| if (!obj || obj->type != OBJ_COMMIT) |
| die("Non commit %s?", revs->pending.objects[i].name); |
| if (found) |
| die("More than one commit to dig from %s and %s?", |
| revs->pending.objects[i].name, name); |
| found = (struct commit *)obj; |
| name = revs->pending.objects[i].name; |
| } |
| if (name_p) |
| *name_p = xstrdup_or_null(name); |
| return found; |
| } |
| |
| static struct commit *dwim_reverse_initial(struct rev_info *revs, |
| const char **name_p) |
| { |
| /* |
| * DWIM "git blame --reverse ONE -- PATH" as |
| * "git blame --reverse ONE..HEAD -- PATH" but only do so |
| * when it makes sense. |
| */ |
| struct object *obj; |
| struct commit *head_commit; |
| struct object_id head_oid; |
| |
| if (revs->pending.nr != 1) |
| return NULL; |
| |
| /* Is that sole rev a committish? */ |
| obj = revs->pending.objects[0].item; |
| obj = deref_tag(revs->repo, obj, NULL, 0); |
| if (!obj || obj->type != OBJ_COMMIT) |
| return NULL; |
| |
| /* Do we have HEAD? */ |
| if (!refs_resolve_ref_unsafe(get_main_ref_store(the_repository), "HEAD", RESOLVE_REF_READING, &head_oid, NULL)) |
| return NULL; |
| head_commit = lookup_commit_reference_gently(revs->repo, |
| &head_oid, 1); |
| if (!head_commit) |
| return NULL; |
| |
| /* Turn "ONE" into "ONE..HEAD" then */ |
| obj->flags |= UNINTERESTING; |
| add_pending_object(revs, &head_commit->object, "HEAD"); |
| |
| if (name_p) |
| *name_p = revs->pending.objects[0].name; |
| return (struct commit *)obj; |
| } |
| |
| static struct commit *find_single_initial(struct rev_info *revs, |
| const char **name_p) |
| { |
| int i; |
| struct commit *found = NULL; |
| const char *name = NULL; |
| |
| /* |
| * There must be one and only one negative commit, and it must be |
| * the boundary. |
| */ |
| for (i = 0; i < revs->pending.nr; i++) { |
| struct object *obj = revs->pending.objects[i].item; |
| if (!(obj->flags & UNINTERESTING)) |
| continue; |
| obj = deref_tag(revs->repo, obj, NULL, 0); |
| if (!obj || obj->type != OBJ_COMMIT) |
| die("Non commit %s?", revs->pending.objects[i].name); |
| if (found) |
| die("More than one commit to dig up from, %s and %s?", |
| revs->pending.objects[i].name, name); |
| found = (struct commit *) obj; |
| name = revs->pending.objects[i].name; |
| } |
| |
| if (!name) |
| found = dwim_reverse_initial(revs, &name); |
| if (!name) |
| die("No commit to dig up from?"); |
| |
| if (name_p) |
| *name_p = xstrdup(name); |
| return found; |
| } |
| |
| void init_scoreboard(struct blame_scoreboard *sb) |
| { |
| memset(sb, 0, sizeof(struct blame_scoreboard)); |
| sb->move_score = BLAME_DEFAULT_MOVE_SCORE; |
| sb->copy_score = BLAME_DEFAULT_COPY_SCORE; |
| } |
| |
| void setup_scoreboard(struct blame_scoreboard *sb, |
| struct blame_origin **orig) |
| { |
| const char *final_commit_name = NULL; |
| struct blame_origin *o; |
| struct commit *final_commit = NULL; |
| enum object_type type; |
| |
| init_blame_suspects(&blame_suspects); |
| |
| if (sb->reverse && sb->contents_from) |
| die(_("--contents and --reverse do not blend well.")); |
| |
| if (!sb->repo) |
| BUG("repo is NULL"); |
| |
| if (!sb->reverse) { |
| sb->final = find_single_final(sb->revs, &final_commit_name); |
| sb->commits.compare = compare_commits_by_commit_date; |
| } else { |
| sb->final = find_single_initial(sb->revs, &final_commit_name); |
| sb->commits.compare = compare_commits_by_reverse_commit_date; |
| } |
| |
| if (sb->reverse && sb->revs->first_parent_only) |
| sb->revs->children.name = NULL; |
| |
| if (sb->contents_from || !sb->final) { |
| struct object_id head_oid, *parent_oid; |
| |
| /* |
| * Build a fake commit at the top of the history, when |
| * (1) "git blame [^A] --path", i.e. with no positive end |
| * of the history range, in which case we build such |
| * a fake commit on top of the HEAD to blame in-tree |
| * modifications. |
| * (2) "git blame --contents=file [A] -- path", with or |
| * without positive end of the history range but with |
| * --contents, in which case we pretend that there is |
| * a fake commit on top of the positive end (defaulting to |
| * HEAD) that has the given contents in the path. |
| */ |
| if (sb->final) { |
| parent_oid = &sb->final->object.oid; |
| } else { |
| if (!refs_resolve_ref_unsafe(get_main_ref_store(the_repository), "HEAD", RESOLVE_REF_READING, &head_oid, NULL)) |
| die("no such ref: HEAD"); |
| parent_oid = &head_oid; |
| } |
| |
| if (!sb->contents_from) |
| setup_work_tree(); |
| |
| sb->final = fake_working_tree_commit(sb->repo, |
| &sb->revs->diffopt, |
| sb->path, sb->contents_from, |
| parent_oid); |
| add_pending_object(sb->revs, &(sb->final->object), ":"); |
| } |
| |
| if (sb->reverse && sb->revs->first_parent_only) { |
| final_commit = find_single_final(sb->revs, NULL); |
| if (!final_commit) |
| die(_("--reverse and --first-parent together require specified latest commit")); |
| } |
| |
| /* |
| * If we have bottom, this will mark the ancestors of the |
| * bottom commits we would reach while traversing as |
| * uninteresting. |
| */ |
| if (prepare_revision_walk(sb->revs)) |
| die(_("revision walk setup failed")); |
| |
| if (sb->reverse && sb->revs->first_parent_only) { |
| struct commit *c = final_commit; |
| |
| sb->revs->children.name = "children"; |
| while (c->parents && |
| !oideq(&c->object.oid, &sb->final->object.oid)) { |
| struct commit_list *l = xcalloc(1, sizeof(*l)); |
| |
| l->item = c; |
| if (add_decoration(&sb->revs->children, |
| &c->parents->item->object, l)) |
| BUG("not unique item in first-parent chain"); |
| c = c->parents->item; |
| } |
| |
| if (!oideq(&c->object.oid, &sb->final->object.oid)) |
| die(_("--reverse --first-parent together require range along first-parent chain")); |
| } |
| |
| if (is_null_oid(&sb->final->object.oid)) { |
| o = get_blame_suspects(sb->final); |
| sb->final_buf = xmemdupz(o->file.ptr, o->file.size); |
| sb->final_buf_size = o->file.size; |
| } |
| else { |
| o = get_origin(sb->final, sb->path); |
| if (fill_blob_sha1_and_mode(sb->repo, o)) |
| die(_("no such path %s in %s"), sb->path, final_commit_name); |
| |
| if (sb->revs->diffopt.flags.allow_textconv && |
| textconv_object(sb->repo, sb->path, o->mode, &o->blob_oid, 1, (char **) &sb->final_buf, |
| &sb->final_buf_size)) |
| ; |
| else |
| sb->final_buf = repo_read_object_file(the_repository, |
| &o->blob_oid, |
| &type, |
| &sb->final_buf_size); |
| |
| if (!sb->final_buf) |
| die(_("cannot read blob %s for path %s"), |
| oid_to_hex(&o->blob_oid), |
| sb->path); |
| } |
| sb->num_read_blob++; |
| prepare_lines(sb); |
| |
| if (orig) |
| *orig = o; |
| |
| free((char *)final_commit_name); |
| } |
| |
| |
| |
| struct blame_entry *blame_entry_prepend(struct blame_entry *head, |
| long start, long end, |
| struct blame_origin *o) |
| { |
| struct blame_entry *new_head = xcalloc(1, sizeof(struct blame_entry)); |
| new_head->lno = start; |
| new_head->num_lines = end - start; |
| new_head->suspect = o; |
| new_head->s_lno = start; |
| new_head->next = head; |
| blame_origin_incref(o); |
| return new_head; |
| } |
| |
| void setup_blame_bloom_data(struct blame_scoreboard *sb) |
| { |
| struct blame_bloom_data *bd; |
| struct bloom_filter_settings *bs; |
| |
| if (!sb->repo->objects->commit_graph) |
| return; |
| |
| bs = get_bloom_filter_settings(sb->repo); |
| if (!bs) |
| return; |
| |
| bd = xmalloc(sizeof(struct blame_bloom_data)); |
| |
| bd->settings = bs; |
| |
| bd->alloc = 4; |
| bd->nr = 0; |
| ALLOC_ARRAY(bd->keys, bd->alloc); |
| |
| add_bloom_key(bd, sb->path); |
| |
| sb->bloom_data = bd; |
| } |
| |
| void cleanup_scoreboard(struct blame_scoreboard *sb) |
| { |
| free(sb->lineno); |
| free(sb->final_buf); |
| clear_prio_queue(&sb->commits); |
| oidset_clear(&sb->ignore_list); |
| |
| if (sb->bloom_data) { |
| int i; |
| for (i = 0; i < sb->bloom_data->nr; i++) { |
| free(sb->bloom_data->keys[i]->hashes); |
| free(sb->bloom_data->keys[i]); |
| } |
| free(sb->bloom_data->keys); |
| FREE_AND_NULL(sb->bloom_data); |
| |
| trace2_data_intmax("blame", sb->repo, |
| "bloom/queries", bloom_count_queries); |
| trace2_data_intmax("blame", sb->repo, |
| "bloom/response-no", bloom_count_no); |
| } |
| } |