--- /dev/null
- parent = lookup_commit_reference(oid->hash);
+ #include "cache.h"
+ #include "refs.h"
+ #include "cache-tree.h"
+ #include "mergesort.h"
+ #include "diff.h"
+ #include "diffcore.h"
+ #include "tag.h"
+ #include "blame.h"
+
+ 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 = o->commit->util; p; l = p, p = p->next) {
+ if (p == o) {
+ if (l)
+ l->next = p->next;
+ else
+ o->commit->util = 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 = commit->util;
+ commit->util = 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 = commit->util, l = NULL; o; l = o, o = o->next) {
+ if (!strcmp(o->path, path)) {
+ /* bump to front */
+ if (l) {
+ l->next = o->next;
+ o->next = commit->util;
+ commit->util = o;
+ }
+ return blame_origin_incref(o);
+ }
+ }
+ return make_origin(commit, path);
+ }
+
+
+
+ static void verify_working_tree_path(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 mode;
+
+ if (!get_tree_entry(commit_oid->hash, path, blob_oid.hash, &mode) &&
+ sha1_object_info(blob_oid.hash, NULL) == OBJ_BLOB)
+ return;
+ }
+
+ pos = cache_name_pos(path, strlen(path));
+ if (pos >= 0)
+ ; /* path is in the index */
+ else if (-1 - pos < active_nr &&
+ !strcmp(active_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 commit_list **tail, const struct object_id *oid)
+ {
+ struct commit *parent;
+
- do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
++ parent = lookup_commit_reference(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 commit_list **tail)
+ {
+ int merge_head;
+ struct strbuf line = STRBUF_INIT;
+
+ merge_head = open(git_path_merge_head(), O_RDONLY);
+ if (merge_head < 0) {
+ if (errno == ENOENT)
+ return;
+ die("cannot open '%s' for reading", git_path_merge_head());
+ }
+
+ while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) {
+ struct object_id oid;
+ if (line.len < GIT_SHA1_HEXSZ || get_oid_hex(line.buf, &oid))
+ die("unknown line in '%s': %s", git_path_merge_head(), line.buf);
+ tail = append_parent(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 commit *c, struct strbuf *sb)
+ {
+ size_t len;
+ void *buf = strbuf_detach(sb, &len);
+ set_commit_buffer(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 diff_options *opt,
+ const char *path,
+ const char *contents_from)
+ {
+ struct commit *commit;
+ struct blame_origin *origin;
+ struct commit_list **parent_tail, *parent;
+ struct object_id head_oid;
+ struct strbuf buf = STRBUF_INIT;
+ const char *ident;
+ time_t now;
+ int size, len;
+ struct cache_entry *ce;
+ unsigned mode;
+ struct strbuf msg = STRBUF_INIT;
+
+ read_cache();
+ time(&now);
+ commit = alloc_commit_node();
+ commit->object.parsed = 1;
+ commit->date = now;
+ parent_tail = &commit->parents;
+
+ if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL))
+ die("no such ref: HEAD");
+
+ parent_tail = append_parent(parent_tail, &head_oid);
+ append_merge_parents(parent_tail);
+ verify_working_tree_path(commit, path);
+
+ origin = make_origin(commit, path);
+
+ ident = fmt_ident("Not Committed Yet", "not.committed.yet", 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(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 (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
+ textconv_object(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(path, buf.buf, buf.len, &buf, 0);
+ origin->file.ptr = buf.buf;
+ origin->file.size = buf.len;
+ pretend_sha1_file(buf.buf, buf.len, OBJ_BLOB, origin->blob_oid.hash);
+
+ /*
+ * 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_cache();
+ read_cache();
+
+ len = strlen(path);
+ if (!mode) {
+ int pos = cache_name_pos(path, len);
+ if (0 <= pos)
+ mode = active_cache[pos]->ce_mode;
+ else
+ /* Let's not bother reading from HEAD tree */
+ mode = S_IFREG | 0644;
+ }
+ size = cache_entry_size(len);
+ ce = xcalloc(1, size);
+ 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_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
+
+ cache_tree_invalidate_path(&the_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);
+ }
+
+ /*
+ * 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)
+ {
+ if (!o->file.ptr) {
+ enum object_type type;
+ unsigned long file_size;
+
+ (*num_read_blob)++;
+ if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
+ textconv_object(o->path, o->mode, &o->blob_oid, 1, &file->ptr, &file_size))
+ ;
+ else
+ file->ptr = read_sha1_file(o->blob_oid.hash, &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;
+ }
+
+ static void drop_origin_blob(struct blame_origin *o)
+ {
+ if (o->file.ptr) {
+ free(o->file.ptr);
+ o->file.ptr = NULL;
+ }
+ }
+
+ /*
+ * 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) == NULL) {
+ *tail = p2;
+ return list1;
+ }
+ } while (p1->s_lno <= p2->s_lno);
+ }
+ for (;;) {
+ *tail = p2;
+ do {
+ tail = &p2->next;
+ if ((p2 = *tail) == NULL) {
+ *tail = p1;
+ return list1;
+ }
+ } while (p1->s_lno > p2->s_lno);
+ *tail = p1;
+ do {
+ tail = &p1->next;
+ if ((p1 = *tail) == NULL) {
+ *tail = p2;
+ return list1;
+ }
+ } while (p1->s_lno <= p2->s_lno);
+ }
+ }
+
+ static void *get_next_blame(const void *p)
+ {
+ return ((struct blame_entry *)p)->next;
+ }
+
+ static void set_next_blame(void *p1, void *p2)
+ {
+ ((struct blame_entry *)p1)->next = p2;
+ }
+
+ /*
+ * Final image line numbers are all different, so we don't need a
+ * three-way comparison here.
+ */
+
+ static int compare_blame_final(const void *p1, const void *p2)
+ {
+ return ((struct blame_entry *)p1)->lno > ((struct blame_entry *)p2)->lno
+ ? 1 : -1;
+ }
+
+ static int compare_blame_suspect(const void *p1, const void *p2)
+ {
+ const struct blame_entry *s1 = p1, *s2 = p2;
+ /*
+ * 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)
+ {
+ sb->ent = llist_mergesort(sb->ent, get_next_blame, set_next_blame,
+ 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->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 = porigin->commit->util; 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 blame_origin *origin)
+ {
+ if (!is_null_oid(&origin->blob_oid))
+ return 0;
+ if (get_tree_entry(origin->commit->object.oid.hash,
+ origin->path,
+ origin->blob_oid.hash, &origin->mode))
+ goto error_out;
+ if (sha1_object_info(origin->blob_oid.hash, NULL) != OBJ_BLOB)
+ goto error_out;
+ return 0;
+ error_out:
+ oidclr(&origin->blob_oid);
+ origin->mode = S_IFINVALID;
+ return -1;
+ }
+
+ /*
+ * 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 commit *parent,
+ struct blame_origin *origin)
+ {
+ struct blame_origin *porigin;
+ struct diff_options diff_opts;
+ const char *paths[2];
+
+ /* First check any existing origins */
+ for (porigin = parent->util; 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.
+ */
+ diff_setup(&diff_opts);
+ DIFF_OPT_SET(&diff_opts, RECURSIVE);
+ 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(parent->tree->object.oid.hash, &diff_opts);
++ do_diff_cache(&parent->tree->object.oid, &diff_opts);
+ else
+ diff_tree_sha1(parent->tree->object.oid.hash,
+ origin->commit->tree->object.oid.hash,
+ "", &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);
+ clear_pathspec(&diff_opts.pathspec);
+ 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 commit *parent,
+ struct blame_origin *origin)
+ {
+ struct blame_origin *porigin = NULL;
+ struct diff_options diff_opts;
+ int i;
+
+ diff_setup(&diff_opts);
+ DIFF_OPT_SET(&diff_opts, RECURSIVE);
+ 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(parent->tree->object.oid.hash, &diff_opts);
++ do_diff_cache(&parent->tree->object.oid, &diff_opts);
+ else
+ diff_tree_sha1(parent->tree->object.oid.hash,
+ origin->commit->tree->object.oid.hash,
+ "", &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)) {
+ porigin = get_origin(parent, p->one->path);
+ oidcpy(&porigin->blob_oid, &p->one->oid);
+ porigin->mode = p->one->mode;
+ break;
+ }
+ }
+ diff_flush(&diff_opts);
+ clear_pathspec(&diff_opts.pathspec);
+ 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;
+ memset(split, 0, sizeof(struct blame_entry [3]));
+
+ 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;
+ }
+
+ /*
+ * 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.
+ */
+ static void blame_chunk(struct blame_entry ***dstq, struct blame_entry ***srcq,
+ int tlno, int offset, int same,
+ struct blame_origin *parent)
+ {
+ struct blame_entry *e = **srcq;
+ struct blame_entry *samep = NULL, *diffp = 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 */
+ int len = tlno - e->s_lno;
+ struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
+ n->suspect = e->suspect;
+ 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;
+ /* 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;
+ 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
+ */
+ int len = same - e->s_lno;
+ struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
+ n->suspect = blame_origin_incref(e->suspect);
+ 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;
+ /* Push new record to samep */
+ n->next = samep;
+ samep = n;
+ }
+ e->next = diffp;
+ diffp = e;
+ e = 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;
+ long offset;
+ 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, d->parent);
+ 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)
+ {
+ 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.offset = 0;
+ d.dstq = &newdest; d.srcq = &target->suspects;
+
+ fill_origin_blob(&sb->revs->diffopt, parent, &file_p, &sb->num_read_blob);
+ fill_origin_blob(&sb->revs->diffopt, target, &file_o, &sb->num_read_blob);
+ 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, parent);
+ *d.dstq = NULL;
+ 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 this[] 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 this and best_so_far and copying this 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 *this)
+ {
+ int i;
+
+ if (!this[1].suspect)
+ return;
+ if (best_so_far[1].suspect) {
+ if (blame_entry_score(sb, &this[1]) < blame_entry_score(sb, &best_so_far[1]))
+ return;
+ }
+
+ for (i = 0; i < 3; i++)
+ blame_origin_incref(this[i].suspect);
+ decref_split(best_so_far);
+ memcpy(best_so_far, this, 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 this[3];
+ tlno += ent->s_lno;
+ same += ent->s_lno;
+ split_overlap(this, ent, tlno, plno, same, parent);
+ copy_split_if_better(sb, split, this);
+ decref_split(this);
+ }
+ }
+
+ 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);
+ 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) {
+ blame_list = xcalloc(num_ents, sizeof(struct blame_list));
+ 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 */
+
+ diff_setup(&diff_opts);
+ DIFF_OPT_SET(&diff_opts, RECURSIVE);
+ 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_sha1() 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_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
+
+ if (is_null_oid(&target->commit->object.oid))
- unsigned char head_sha1[20];
++ do_diff_cache(&parent->tree->object.oid, &diff_opts);
+ else
+ diff_tree_sha1(parent->tree->object.oid.hash,
+ target->commit->tree->object.oid.hash,
+ "", &diff_opts);
+
+ if (!DIFF_OPT_TST(&diff_opts, 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 this[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);
+ if (!file_p.ptr)
+ continue;
+
+ for (j = 0; j < num_ents; j++) {
+ find_copy_in_blob(sb, blame_list[j].ent,
+ norigin, this, &file_p);
+ copy_split_if_better(sb, blame_list[j].split,
+ this);
+ decref_split(this);
+ }
+ 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);
+ clear_pathspec(&diff_opts.pathspec);
+ }
+
+ /*
+ * 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)
+ {
+ blamed = llist_mergesort(blamed, get_next_blame, set_next_blame,
+ 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
+
+ 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
+ sg_origin = xcalloc(num_sg, sizeof(*sg_origin));
+
+ /*
+ * 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++) {
+ struct blame_origin *(*find)(struct commit *, struct blame_origin *);
+ 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 (parse_commit(p))
+ continue;
+ porigin = find(p, origin);
+ if (!porigin)
+ continue;
+ if (!oidcmp(&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] &&
+ !oidcmp(&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);
+ 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]) {
+ 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 = commit->util;
+
+ /* 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);
+ parse_commit(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(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);
+ }
+ }
+
+ 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;
+ }
+
+ /*
+ * 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)
+ {
+ const char *buf = sb->final_buf;
+ unsigned long len = sb->final_buf_size;
+ 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(sb->lineno, num + 1);
+ lineno = sb->lineno;
+
+ for (p = buf; p < end; p = get_next_line(p, end))
+ *lineno++ = p - buf;
+
+ *lineno = len;
+
+ sb->num_lines = num;
+ 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(obj, NULL, 0);
+ if (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 = 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;
- if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_sha1, NULL))
++ 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(obj, NULL, 0);
+ if (obj->type != OBJ_COMMIT)
+ return NULL;
+
+ /* Do we have HEAD? */
- head_commit = lookup_commit_reference_gently(head_sha1, 1);
++ if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL))
+ return NULL;
++ head_commit = lookup_commit_reference_gently(&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(obj, NULL, 0);
+ if (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 = 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, const char *path, struct blame_origin **orig)
+ {
+ const char *final_commit_name = NULL;
+ struct blame_origin *o;
+ struct commit *final_commit = NULL;
+ enum object_type type;
+
+ if (sb->reverse && sb->contents_from)
+ die(_("--contents and --reverse do not blend well."));
+
+ 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->final && sb->contents_from)
+ die(_("cannot use --contents with final commit object name"));
+
+ if (sb->reverse && sb->revs->first_parent_only)
+ sb->revs->children.name = NULL;
+
+ if (!sb->final) {
+ /*
+ * "--not A B -- path" without anything positive;
+ * do not default to HEAD, but use the working tree
+ * or "--contents".
+ */
+ setup_work_tree();
+ sb->final = fake_working_tree_commit(&sb->revs->diffopt,
+ path, sb->contents_from);
+ 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 &&
+ oidcmp(&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))
+ die("BUG: not unique item in first-parent chain");
+ c = c->parents->item;
+ }
+
+ if (oidcmp(&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 = sb->final->util;
+ sb->final_buf = xmemdupz(o->file.ptr, o->file.size);
+ sb->final_buf_size = o->file.size;
+ }
+ else {
+ o = get_origin(sb->final, path);
+ if (fill_blob_sha1_and_mode(o))
+ die(_("no such path %s in %s"), path, final_commit_name);
+
+ if (DIFF_OPT_TST(&sb->revs->diffopt, ALLOW_TEXTCONV) &&
+ textconv_object(path, o->mode, &o->blob_oid, 1, (char **) &sb->final_buf,
+ &sb->final_buf_size))
+ ;
+ else
+ sb->final_buf = read_sha1_file(o->blob_oid.hash, &type,
+ &sb->final_buf_size);
+
+ if (!sb->final_buf)
+ die(_("cannot read blob %s for path %s"),
+ oid_to_hex(&o->blob_oid),
+ path);
+ }
+ sb->num_read_blob++;
+ prepare_lines(sb);
+
+ if (orig)
+ *orig = o;
+ }
+
+
+
+ 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;
+ }
*/
#include "cache.h"
- #include "refs.h"
#include "builtin.h"
- #include "blob.h"
#include "commit.h"
- #include "tag.h"
- #include "tree-walk.h"
#include "diff.h"
- #include "diffcore.h"
#include "revision.h"
#include "quote.h"
- #include "xdiff-interface.h"
- #include "cache-tree.h"
#include "string-list.h"
#include "mailmap.h"
- #include "mergesort.h"
#include "parse-options.h"
#include "prio-queue.h"
#include "utf8.h"
#include "line-log.h"
#include "dir.h"
#include "progress.h"
+ #include "blame.h"
static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] <file>");
#define DEBUG 0
#endif
- /* stats */
- static int num_read_blob;
- static int num_get_patch;
- static int num_commits;
-
- #define PICKAXE_BLAME_MOVE 01
- #define PICKAXE_BLAME_COPY 02
- #define PICKAXE_BLAME_COPY_HARDER 04
- #define PICKAXE_BLAME_COPY_HARDEST 010
-
- /*
- * blame for a blame_entry with score lower than these thresholds
- * is not passed to the parent using move/copy logic.
- */
- static unsigned blame_move_score;
- static unsigned blame_copy_score;
- #define BLAME_DEFAULT_MOVE_SCORE 20
- #define BLAME_DEFAULT_COPY_SCORE 40
-
- /* Remember to update object flag allocation in object.h */
- #define METAINFO_SHOWN (1u<<12)
- #define MORE_THAN_ONE_PATH (1u<<13)
-
- /*
- * One blob in a commit that is being suspected
- */
- struct origin {
- int refcnt;
- /* Record preceding blame record for this blob */
- struct origin *previous;
- /* origins are put in a list linked via `next' hanging off the
- * corresponding commit's util field in order to make finding
- * them fast. The presence in this chain does not count
- * towards the origin's reference count. It is tempting to
- * let it count as long as the commit is pending examination,
- * but even under circumstances where the commit will be
- * present multiple times in the priority queue of unexamined
- * commits, processing the first instance will not leave any
- * work requiring the origin data for the second instance. An
- * interspersed commit changing that would have to be
- * preexisting with a different ancestry and with the same
- * commit date in order to wedge itself between two instances
- * of the same commit in the priority queue _and_ produce
- * blame entries relevant for it. While we don't want to let
- * us get tripped up by this case, it certainly does not seem
- * worth optimizing for.
- */
- struct origin *next;
- struct commit *commit;
- /* `suspects' contains blame entries that may be attributed to
- * this origin's commit or to parent commits. When a commit
- * is being processed, all suspects will be moved, either by
- * assigning them to an origin in a different commit, or by
- * shipping them to the scoreboard's ent list because they
- * cannot be attributed to a different commit.
- */
- struct blame_entry *suspects;
- mmfile_t file;
- struct object_id blob_oid;
- unsigned mode;
- /* guilty gets set when shipping any suspects to the final
- * blame list instead of other commits
- */
- char guilty;
- char path[FLEX_ARRAY];
- };
-
- struct progress_info {
- struct progress *progress;
- int blamed_lines;
- };
-
- static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b,
- xdl_emit_hunk_consume_func_t hunk_func, void *cb_data)
- {
- 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);
- }
-
- /*
- * Prepare diff_filespec and convert it using diff textconv API
- * if the textconv driver exists.
- * Return 1 if the conversion succeeds, 0 otherwise.
- */
- int textconv_object(const char *path,
- unsigned mode,
- const struct object_id *oid,
- int oid_valid,
- char **buf,
- unsigned long *buf_size)
- {
- struct diff_filespec *df;
- struct userdiff_driver *textconv;
-
- df = alloc_filespec(path);
- fill_filespec(df, oid->hash, oid_valid, mode);
- textconv = get_textconv(df);
- if (!textconv) {
- free_filespec(df);
- return 0;
- }
-
- *buf_size = fill_textconv(textconv, df, buf);
- free_filespec(df);
- return 1;
- }
-
- /*
- * Given an origin, prepare mmfile_t structure to be used by the
- * diff machinery
- */
- static void fill_origin_blob(struct diff_options *opt,
- struct origin *o, mmfile_t *file)
- {
- if (!o->file.ptr) {
- enum object_type type;
- unsigned long file_size;
-
- num_read_blob++;
- if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
- textconv_object(o->path, o->mode, &o->blob_oid, 1, &file->ptr, &file_size))
- ;
- else
- file->ptr = read_sha1_file(o->blob_oid.hash, &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;
- }
-
- /*
- * Origin is refcounted and usually we keep the blob contents to be
- * reused.
- */
- static inline struct origin *origin_incref(struct origin *o)
- {
- if (o)
- o->refcnt++;
- return o;
- }
-
- static void origin_decref(struct origin *o)
- {
- if (o && --o->refcnt <= 0) {
- struct origin *p, *l = NULL;
- if (o->previous)
- origin_decref(o->previous);
- free(o->file.ptr);
- /* Should be present exactly once in commit chain */
- for (p = o->commit->util; p; l = p, p = p->next) {
- if (p == o) {
- if (l)
- l->next = p->next;
- else
- o->commit->util = p->next;
- free(o);
- return;
- }
- }
- die("internal error in blame::origin_decref");
- }
- }
-
- static void drop_origin_blob(struct origin *o)
- {
- if (o->file.ptr) {
- free(o->file.ptr);
- o->file.ptr = NULL;
- }
- }
-
- /*
- * Each group of lines is described by a blame_entry; it can be split
- * as we pass blame to the parents. They are arranged in linked lists
- * kept as `suspects' of some unprocessed origin, or entered (when the
- * blame origin has been finalized) into the scoreboard structure.
- * While the scoreboard structure is only sorted at the end of
- * processing (according to final image line number), the lists
- * attached to an origin are sorted by the target line number.
- */
- struct blame_entry {
- struct blame_entry *next;
-
- /* the first line of this group in the final image;
- * internally all line numbers are 0 based.
- */
- int lno;
-
- /* how many lines this group has */
- int num_lines;
-
- /* the commit that introduced this group into the final image */
- struct origin *suspect;
-
- /* the line number of the first line of this group in the
- * suspect's file; internally all line numbers are 0 based.
- */
- int s_lno;
-
- /* how significant this entry is -- cached to avoid
- * scanning the lines over and over.
- */
- unsigned score;
- };
-
- /*
- * 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) == NULL) {
- *tail = p2;
- return list1;
- }
- } while (p1->s_lno <= p2->s_lno);
- }
- for (;;) {
- *tail = p2;
- do {
- tail = &p2->next;
- if ((p2 = *tail) == NULL) {
- *tail = p1;
- return list1;
- }
- } while (p1->s_lno > p2->s_lno);
- *tail = p1;
- do {
- tail = &p1->next;
- if ((p1 = *tail) == NULL) {
- *tail = p2;
- return list1;
- }
- } while (p1->s_lno <= p2->s_lno);
- }
- }
-
- static void *get_next_blame(const void *p)
- {
- return ((struct blame_entry *)p)->next;
- }
-
- static void set_next_blame(void *p1, void *p2)
- {
- ((struct blame_entry *)p1)->next = p2;
- }
-
- /*
- * Final image line numbers are all different, so we don't need a
- * three-way comparison here.
- */
-
- static int compare_blame_final(const void *p1, const void *p2)
- {
- return ((struct blame_entry *)p1)->lno > ((struct blame_entry *)p2)->lno
- ? 1 : -1;
- }
-
- static int compare_blame_suspect(const void *p1, const void *p2)
- {
- const struct blame_entry *s1 = p1, *s2 = p2;
- /*
- * 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;
- }
-
- static struct blame_entry *blame_sort(struct blame_entry *head,
- int (*compare_fn)(const void *, const void *))
- {
- return llist_mergesort (head, get_next_blame, set_next_blame, compare_fn);
- }
-
- 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);
- }
-
- /*
- * The current state of the blame assignment.
- */
- struct scoreboard {
- /* the final commit (i.e. where we started digging from) */
- struct commit *final;
- /* Priority queue for commits with unassigned blame records */
- struct prio_queue commits;
- struct rev_info *revs;
- const char *path;
-
- /*
- * The contents in the final image.
- * Used by many functions to obtain contents of the nth line,
- * indexed with scoreboard.lineno[blame_entry.lno].
- */
- const char *final_buf;
- unsigned long final_buf_size;
-
- /* linked list of blames */
- struct blame_entry *ent;
-
- /* look-up a line in the final buffer */
- int num_lines;
- int *lineno;
- };
-
- static void sanity_check_refcnt(struct scoreboard *);
-
- /*
- * 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.
- */
- static void coalesce(struct 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->num_lines += next->num_lines;
- ent->next = next->next;
- origin_decref(next->suspect);
- free(next);
- ent->score = 0;
- next = ent; /* again */
- }
- }
-
- if (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 scoreboard *sb, struct origin *porigin,
- struct blame_entry *sorted)
- {
- if (porigin->suspects)
- porigin->suspects = blame_merge(porigin->suspects, sorted);
- else {
- struct origin *o;
- for (o = porigin->commit->util; o; o = o->next) {
- if (o->suspects) {
- porigin->suspects = sorted;
- return;
- }
- }
- porigin->suspects = sorted;
- prio_queue_put(&sb->commits, porigin->commit);
- }
- }
-
- /*
- * 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 origin *make_origin(struct commit *commit, const char *path)
- {
- struct origin *o;
- FLEX_ALLOC_STR(o, path, path);
- o->commit = commit;
- o->refcnt = 1;
- o->next = commit->util;
- commit->util = 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 origin *get_origin(struct scoreboard *sb,
- struct commit *commit,
- const char *path)
- {
- struct origin *o, *l;
-
- for (o = commit->util, l = NULL; o; l = o, o = o->next) {
- if (!strcmp(o->path, path)) {
- /* bump to front */
- if (l) {
- l->next = o->next;
- o->next = commit->util;
- commit->util = o;
- }
- return origin_incref(o);
- }
- }
- return make_origin(commit, path);
- }
-
- /*
- * 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 origin *origin)
- {
- if (!is_null_oid(&origin->blob_oid))
- return 0;
- if (get_tree_entry(origin->commit->object.oid.hash,
- origin->path,
- origin->blob_oid.hash, &origin->mode))
- goto error_out;
- if (sha1_object_info(origin->blob_oid.hash, NULL) != OBJ_BLOB)
- goto error_out;
- return 0;
- error_out:
- oidclr(&origin->blob_oid);
- origin->mode = S_IFINVALID;
- return -1;
- }
-
- /*
- * We have an origin -- check if the same path exists in the
- * parent and return an origin structure to represent it.
- */
- static struct origin *find_origin(struct scoreboard *sb,
- struct commit *parent,
- struct origin *origin)
- {
- struct origin *porigin;
- struct diff_options diff_opts;
- const char *paths[2];
-
- /* First check any existing origins */
- for (porigin = parent->util; 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 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.
- */
- diff_setup(&diff_opts);
- DIFF_OPT_SET(&diff_opts, RECURSIVE);
- 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(&parent->tree->object.oid, &diff_opts);
- else
- diff_tree_sha1(parent->tree->object.oid.hash,
- origin->commit->tree->object.oid.hash,
- "", &diff_opts);
- diffcore_std(&diff_opts);
-
- if (!diff_queued_diff.nr) {
- /* The path is the same as parent */
- porigin = get_origin(sb, 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(sb, 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);
- clear_pathspec(&diff_opts.pathspec);
- 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 origin *find_rename(struct scoreboard *sb,
- struct commit *parent,
- struct origin *origin)
- {
- struct origin *porigin = NULL;
- struct diff_options diff_opts;
- int i;
-
- diff_setup(&diff_opts);
- DIFF_OPT_SET(&diff_opts, RECURSIVE);
- 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(&parent->tree->object.oid, &diff_opts);
- else
- diff_tree_sha1(parent->tree->object.oid.hash,
- origin->commit->tree->object.oid.hash,
- "", &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)) {
- porigin = get_origin(sb, parent, p->one->path);
- oidcpy(&porigin->blob_oid, &p->one->oid);
- porigin->mode = p->one->mode;
- break;
- }
- }
- diff_flush(&diff_opts);
- clear_pathspec(&diff_opts.pathspec);
- 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));
- 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)
- {
- origin_incref(src->suspect);
- origin_decref(dst->suspect);
- memcpy(dst, src, sizeof(*src));
- dst->next = **queue;
- **queue = dst;
- *queue = &dst->next;
- }
-
- static const char *nth_line(struct scoreboard *sb, long lno)
- {
- return sb->final_buf + sb->lineno[lno];
- }
-
- static const char *nth_line_cb(void *data, long lno)
- {
- return nth_line((struct scoreboard *)data, 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 origin *parent)
- {
- int chunk_end_lno;
- memset(split, 0, sizeof(struct blame_entry [3]));
-
- if (e->s_lno < tlno) {
- /* there is a pre-chunk part not blamed on parent */
- split[0].suspect = 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 = 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 = 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++)
- 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;
- }
-
- /*
- * 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.
- */
- static void blame_chunk(struct blame_entry ***dstq, struct blame_entry ***srcq,
- int tlno, int offset, int same,
- struct origin *parent)
- {
- struct blame_entry *e = **srcq;
- struct blame_entry *samep = NULL, *diffp = 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 */
- int len = tlno - e->s_lno;
- struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
- n->suspect = e->suspect;
- 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;
- /* Push new record to diffp */
- n->next = diffp;
- diffp = n;
- } else
- origin_decref(e->suspect);
- /* Pass blame for everything before the differing
- * chunk to the parent */
- e->suspect = 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;
- 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
- */
- int len = same - e->s_lno;
- struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
- n->suspect = origin_incref(e->suspect);
- 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;
- /* Push new record to samep */
- n->next = samep;
- samep = n;
- }
- e->next = diffp;
- diffp = e;
- e = 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 origin *parent;
- long offset;
- 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, d->parent);
- 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 scoreboard *sb,
- struct origin *target,
- struct origin *parent)
- {
- 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.offset = 0;
- d.dstq = &newdest; d.srcq = &target->suspects;
-
- fill_origin_blob(&sb->revs->diffopt, parent, &file_p);
- fill_origin_blob(&sb->revs->diffopt, target, &file_o);
- num_get_patch++;
-
- if (diff_hunks(&file_p, &file_o, blame_chunk_cb, &d))
- 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, parent);
- *d.dstq = NULL;
- 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.
- */
- static unsigned ent_score(struct scoreboard *sb, struct blame_entry *e)
- {
- unsigned score;
- const char *cp, *ep;
-
- if (e->score)
- return e->score;
-
- score = 1;
- cp = nth_line(sb, e->lno);
- ep = 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 this[] 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 this and best_so_far and copying this into
- * bst_so_far as needed.
- */
- static void copy_split_if_better(struct scoreboard *sb,
- struct blame_entry *best_so_far,
- struct blame_entry *this)
- {
- int i;
-
- if (!this[1].suspect)
- return;
- if (best_so_far[1].suspect) {
- if (ent_score(sb, &this[1]) < ent_score(sb, &best_so_far[1]))
- return;
- }
-
- for (i = 0; i < 3; i++)
- origin_incref(this[i].suspect);
- decref_split(best_so_far);
- memcpy(best_so_far, this, 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 scoreboard *sb,
- struct blame_entry *ent,
- int tlno, int plno, int same,
- struct origin *parent,
- struct blame_entry *split)
- {
- if (ent->num_lines <= tlno)
- return;
- if (tlno < same) {
- struct blame_entry this[3];
- tlno += ent->s_lno;
- same += ent->s_lno;
- split_overlap(this, ent, tlno, plno, same, parent);
- copy_split_if_better(sb, split, this);
- decref_split(this);
- }
- }
-
- struct handle_split_cb_data {
- struct scoreboard *sb;
- struct blame_entry *ent;
- struct 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 scoreboard *sb,
- struct blame_entry *ent,
- struct 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 = nth_line(sb, ent->lno);
- file_o.ptr = (char *) cp;
- file_o.size = 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))
- 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 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 (ent_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 scoreboard *sb,
- struct blame_entry ***blamed,
- struct blame_entry **toosmall,
- struct origin *target,
- struct 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);
- if (!file_p.ptr)
- return;
+ static unsigned blame_move_score;
+ static unsigned blame_copy_score;
- /* 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 &&
- blame_move_score < ent_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, blame_move_score);
- } while (unblamed);
- target->suspects = reverse_blame(leftover, NULL);
- }
+ /* Remember to update object flag allocation in object.h */
+ #define METAINFO_SHOWN (1u<<12)
+ #define MORE_THAN_ONE_PATH (1u<<13)
- struct blame_list {
- struct blame_entry *ent;
- struct blame_entry split[3];
+ struct progress_info {
+ struct progress *progress;
+ int blamed_lines;
};
- /*
- * 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) {
- blame_list = xcalloc(num_ents, sizeof(struct blame_list));
- 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 scoreboard *sb,
- struct blame_entry ***blamed,
- struct blame_entry **toosmall,
- struct origin *target,
- struct commit *parent,
- struct 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 */
-
- diff_setup(&diff_opts);
- DIFF_OPT_SET(&diff_opts, RECURSIVE);
- 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_sha1() 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_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
-
- if (is_null_oid(&target->commit->object.oid))
- do_diff_cache(&parent->tree->object.oid, &diff_opts);
- else
- diff_tree_sha1(parent->tree->object.oid.hash,
- target->commit->tree->object.oid.hash,
- "", &diff_opts);
-
- if (!DIFF_OPT_TST(&diff_opts, 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 origin *norigin;
- mmfile_t file_p;
- struct blame_entry this[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(sb, 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);
- if (!file_p.ptr)
- continue;
-
- for (j = 0; j < num_ents; j++) {
- find_copy_in_blob(sb, blame_list[j].ent,
- norigin, this, &file_p);
- copy_split_if_better(sb, blame_list[j].split,
- this);
- decref_split(this);
- }
- origin_decref(norigin);
- }
-
- for (j = 0; j < num_ents; j++) {
- struct blame_entry *split = blame_list[j].split;
- if (split[1].suspect &&
- blame_copy_score < ent_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, blame_copy_score);
- } while (unblamed);
- target->suspects = reverse_blame(leftover, NULL);
- diff_flush(&diff_opts);
- clear_pathspec(&diff_opts.pathspec);
- }
-
- /*
- * 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 scoreboard *sb,
- struct origin *origin, struct 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) {
- origin_incref(porigin);
- 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)
- {
- 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)
- {
- struct commit_list *l = first_scapegoat(revs, commit);
- return commit_list_count(l);
- }
-
- /* Distribute collected unsorted blames to the respected sorted lists
- * in the various origins.
- */
- static void distribute_blame(struct scoreboard *sb, struct blame_entry *blamed)
- {
- blamed = blame_sort(blamed, compare_blame_suspect);
- while (blamed)
- {
- struct 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
-
- static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
+ static const char *nth_line_cb(void *data, long lno)
{
- struct rev_info *revs = sb->revs;
- int i, pass, num_sg;
- struct commit *commit = origin->commit;
- struct commit_list *sg;
- struct origin *sg_buf[MAXSG];
- struct origin *porigin, **sg_origin = sg_buf;
- struct blame_entry *toosmall = NULL;
- struct blame_entry *blames, **blametail = &blames;
-
- num_sg = num_scapegoats(revs, commit);
- if (!num_sg)
- goto finish;
- else if (num_sg < ARRAY_SIZE(sg_buf))
- memset(sg_buf, 0, sizeof(sg_buf));
- else
- sg_origin = xcalloc(num_sg, sizeof(*sg_origin));
-
- /*
- * 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 - no_whole_file_rename; pass++) {
- struct origin *(*find)(struct scoreboard *,
- struct commit *, struct origin *);
- find = pass ? find_rename : find_origin;
-
- for (i = 0, sg = first_scapegoat(revs, commit);
- i < num_sg && sg;
- sg = sg->next, i++) {
- struct commit *p = sg->item;
- int j, same;
-
- if (sg_origin[i])
- continue;
- if (parse_commit(p))
- continue;
- porigin = find(sb, p, origin);
- if (!porigin)
- continue;
- if (!oidcmp(&porigin->blob_oid, &origin->blob_oid)) {
- pass_whole_blame(sb, origin, porigin);
- origin_decref(porigin);
- goto finish;
- }
- for (j = same = 0; j < i; j++)
- if (sg_origin[j] &&
- !oidcmp(&sg_origin[j]->blob_oid, &porigin->blob_oid)) {
- same = 1;
- break;
- }
- if (!same)
- sg_origin[i] = porigin;
- else
- origin_decref(porigin);
- }
- }
-
- num_commits++;
- for (i = 0, sg = first_scapegoat(revs, commit);
- i < num_sg && sg;
- sg = sg->next, i++) {
- struct origin *porigin = sg_origin[i];
- if (!porigin)
- continue;
- if (!origin->previous) {
- origin_incref(porigin);
- origin->previous = porigin;
- }
- pass_blame_to_parent(sb, origin, porigin);
- if (!origin->suspects)
- goto finish;
- }
-
- /*
- * Optionally find moves in parents' files.
- */
- if (opt & PICKAXE_BLAME_MOVE) {
- filter_small(sb, &toosmall, &origin->suspects, blame_move_score);
- if (origin->suspects) {
- for (i = 0, sg = first_scapegoat(revs, commit);
- i < num_sg && sg;
- sg = sg->next, i++) {
- struct 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 (blame_copy_score > blame_move_score)
- filter_small(sb, &toosmall, &origin->suspects, blame_copy_score);
- else if (blame_copy_score < blame_move_score) {
- origin->suspects = blame_merge(origin->suspects, toosmall);
- toosmall = NULL;
- filter_small(sb, &toosmall, &origin->suspects, blame_copy_score);
- }
- if (!origin->suspects)
- goto finish;
-
- for (i = 0, sg = first_scapegoat(revs, commit);
- i < num_sg && sg;
- sg = sg->next, i++) {
- struct 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]) {
- drop_origin_blob(sg_origin[i]);
- origin_decref(sg_origin[i]);
- }
- }
- drop_origin_blob(origin);
- if (sg_buf != sg_origin)
- free(sg_origin);
+ return blame_nth_line((struct blame_scoreboard *)data, lno);
}
/*
* To allow LF and other nonportable characters in pathnames,
* they are c-style quoted as needed.
*/
- static void write_filename_info(struct origin *suspect)
+ static void write_filename_info(struct blame_origin *suspect)
{
if (suspect->previous) {
- struct origin *prev = suspect->previous;
+ struct blame_origin *prev = suspect->previous;
printf("previous %s ", oid_to_hex(&prev->commit->object.oid));
write_name_quoted(prev->path, stdout, '\n');
}
* the first time each commit appears in the output (unless the
* user has specifically asked for us to repeat).
*/
- static int emit_one_suspect_detail(struct origin *suspect, int repeat)
+ static int emit_one_suspect_detail(struct blame_origin *suspect, int repeat)
{
struct commit_info ci;
* The blame_entry is found to be guilty for the range.
* Show it in incremental output.
*/
- static void found_guilty_entry(struct blame_entry *ent,
- struct progress_info *pi)
+ static void found_guilty_entry(struct blame_entry *ent, void *data)
{
+ struct progress_info *pi = (struct progress_info *)data;
+
if (incremental) {
- struct origin *suspect = ent->suspect;
+ struct blame_origin *suspect = ent->suspect;
printf("%s %d %d %d\n",
oid_to_hex(&suspect->commit->object.oid),
display_progress(pi->progress, pi->blamed_lines);
}
- /*
- * 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. */
- static void assign_blame(struct scoreboard *sb, int opt)
- {
- struct rev_info *revs = sb->revs;
- struct commit *commit = prio_queue_get(&sb->commits);
- struct progress_info pi = { NULL, 0 };
-
- if (show_progress)
- pi.progress = start_progress_delay(_("Blaming lines"),
- sb->num_lines, 50, 1);
-
- while (commit) {
- struct blame_entry *ent;
- struct origin *suspect = commit->util;
-
- /* 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.
- */
- origin_incref(suspect);
- parse_commit(commit);
- if (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(commit);
- }
- /* treat root commit as boundary */
- if (!commit->parents && !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;
- found_guilty_entry(ent, &pi);
- if (next) {
- ent = next;
- continue;
- }
- ent->next = sb->ent;
- sb->ent = suspect->suspects;
- suspect->suspects = NULL;
- break;
- }
- }
- origin_decref(suspect);
-
- if (DEBUG) /* sanity */
- sanity_check_refcnt(sb);
- }
-
- stop_progress(&pi.progress);
- }
-
static const char *format_time(timestamp_t time, const char *tz_str,
int show_raw_time)
{
#define OUTPUT_SHOW_EMAIL 0400
#define OUTPUT_LINE_PORCELAIN 01000
- static void emit_porcelain_details(struct origin *suspect, int repeat)
+ static void emit_porcelain_details(struct blame_origin *suspect, int repeat)
{
if (emit_one_suspect_detail(suspect, repeat) ||
(suspect->commit->object.flags & MORE_THAN_ONE_PATH))
write_filename_info(suspect);
}
- static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent,
+ static void emit_porcelain(struct blame_scoreboard *sb, struct blame_entry *ent,
int opt)
{
int repeat = opt & OUTPUT_LINE_PORCELAIN;
int cnt;
const char *cp;
- struct origin *suspect = ent->suspect;
+ struct blame_origin *suspect = ent->suspect;
char hex[GIT_MAX_HEXSZ + 1];
oid_to_hex_r(hex, &suspect->commit->object.oid);
ent->num_lines);
emit_porcelain_details(suspect, repeat);
- cp = nth_line(sb, ent->lno);
+ cp = blame_nth_line(sb, ent->lno);
for (cnt = 0; cnt < ent->num_lines; cnt++) {
char ch;
if (cnt) {
putchar('\n');
}
- static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
+ static void emit_other(struct blame_scoreboard *sb, struct blame_entry *ent, int opt)
{
int cnt;
const char *cp;
- struct origin *suspect = ent->suspect;
+ struct blame_origin *suspect = ent->suspect;
struct commit_info ci;
char hex[GIT_MAX_HEXSZ + 1];
int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
get_commit_info(suspect->commit, &ci, 1);
oid_to_hex_r(hex, &suspect->commit->object.oid);
- cp = nth_line(sb, ent->lno);
+ cp = blame_nth_line(sb, ent->lno);
for (cnt = 0; cnt < ent->num_lines; cnt++) {
char ch;
int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? GIT_SHA1_HEXSZ : abbrev;
commit_info_destroy(&ci);
}
- static void output(struct scoreboard *sb, int option)
+ static void output(struct blame_scoreboard *sb, int option)
{
struct blame_entry *ent;
if (option & OUTPUT_PORCELAIN) {
for (ent = sb->ent; ent; ent = ent->next) {
int count = 0;
- struct origin *suspect;
+ struct blame_origin *suspect;
struct commit *commit = ent->suspect->commit;
if (commit->object.flags & MORE_THAN_ONE_PATH)
continue;
}
}
- 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;
- }
-
- /*
- * 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 scoreboard *sb)
- {
- const char *buf = sb->final_buf;
- unsigned long len = sb->final_buf_size;
- 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(sb->lineno, num + 1);
- lineno = sb->lineno;
-
- for (p = buf; p < end; p = get_next_line(p, end))
- *lineno++ = p - buf;
-
- *lineno = len;
-
- sb->num_lines = num;
- return sb->num_lines;
- }
-
/*
* Add phony grafts for use with -S; this is primarily to
* support git's cvsserver that wants to give a linear history
return 0;
}
- static int update_auto_abbrev(int auto_abbrev, struct origin *suspect)
+ static int update_auto_abbrev(int auto_abbrev, struct blame_origin *suspect)
{
const char *uniq = find_unique_abbrev(suspect->commit->object.oid.hash,
auto_abbrev);
* How many columns do we need to show line numbers, authors,
* and filenames?
*/
- static void find_alignment(struct scoreboard *sb, int *option)
+ static void find_alignment(struct blame_scoreboard *sb, int *option)
{
int longest_src_lines = 0;
int longest_dst_lines = 0;
int auto_abbrev = DEFAULT_ABBREV;
for (e = sb->ent; e; e = e->next) {
- struct origin *suspect = e->suspect;
+ struct blame_origin *suspect = e->suspect;
int num;
if (compute_auto_abbrev)
num = e->lno + e->num_lines;
if (longest_dst_lines < num)
longest_dst_lines = num;
- if (largest_score < ent_score(sb, e))
- largest_score = ent_score(sb, e);
+ if (largest_score < blame_entry_score(sb, e))
+ largest_score = blame_entry_score(sb, e);
}
max_orig_digits = decimal_width(longest_src_lines);
max_digits = decimal_width(longest_dst_lines);
abbrev = auto_abbrev + 1;
}
- /*
- * For debugging -- origin is refcounted, and this asserts that
- * we do not underflow.
- */
- static void sanity_check_refcnt(struct scoreboard *sb)
+ static void sanity_check_on_fail(struct blame_scoreboard *sb, int baa)
{
- 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) {
- int opt = 0160;
- find_alignment(sb, &opt);
- output(sb, opt);
- die("Baa %d!", baa);
- }
+ int opt = OUTPUT_SHOW_SCORE | OUTPUT_SHOW_NUMBER | OUTPUT_SHOW_NAME;
+ find_alignment(sb, &opt);
+ output(sb, opt);
+ die("Baa %d!", baa);
}
static unsigned parse_score(const char *arg)
return git_default_config(var, value, cb);
}
- static void verify_working_tree_path(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 mode;
-
- if (!get_tree_entry(commit_oid->hash, path, blob_oid.hash, &mode) &&
- sha1_object_info(blob_oid.hash, NULL) == OBJ_BLOB)
- return;
- }
-
- pos = cache_name_pos(path, strlen(path));
- if (pos >= 0)
- ; /* path is in the index */
- else if (-1 - pos < active_nr &&
- !strcmp(active_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 commit_list **tail, const struct object_id *oid)
- {
- struct commit *parent;
-
- parent = lookup_commit_reference(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 commit_list **tail)
- {
- int merge_head;
- struct strbuf line = STRBUF_INIT;
-
- merge_head = open(git_path_merge_head(), O_RDONLY);
- if (merge_head < 0) {
- if (errno == ENOENT)
- return;
- die("cannot open '%s' for reading", git_path_merge_head());
- }
-
- while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) {
- struct object_id oid;
- if (line.len < GIT_SHA1_HEXSZ || get_oid_hex(line.buf, &oid))
- die("unknown line in '%s': %s", git_path_merge_head(), line.buf);
- tail = append_parent(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 commit *c, struct strbuf *sb)
- {
- size_t len;
- void *buf = strbuf_detach(sb, &len);
- set_commit_buffer(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 diff_options *opt,
- const char *path,
- const char *contents_from)
- {
- struct commit *commit;
- struct origin *origin;
- struct commit_list **parent_tail, *parent;
- struct object_id head_oid;
- struct strbuf buf = STRBUF_INIT;
- const char *ident;
- time_t now;
- int size, len;
- struct cache_entry *ce;
- unsigned mode;
- struct strbuf msg = STRBUF_INIT;
-
- read_cache();
- time(&now);
- commit = alloc_commit_node();
- commit->object.parsed = 1;
- commit->date = now;
- parent_tail = &commit->parents;
-
- if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL))
- die("no such ref: HEAD");
-
- parent_tail = append_parent(parent_tail, &head_oid);
- append_merge_parents(parent_tail);
- verify_working_tree_path(commit, path);
-
- origin = make_origin(commit, path);
-
- ident = fmt_ident("Not Committed Yet", "not.committed.yet", 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(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 (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
- textconv_object(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(path, buf.buf, buf.len, &buf, 0);
- origin->file.ptr = buf.buf;
- origin->file.size = buf.len;
- pretend_sha1_file(buf.buf, buf.len, OBJ_BLOB, origin->blob_oid.hash);
-
- /*
- * 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_cache();
- read_cache();
-
- len = strlen(path);
- if (!mode) {
- int pos = cache_name_pos(path, len);
- if (0 <= pos)
- mode = active_cache[pos]->ce_mode;
- else
- /* Let's not bother reading from HEAD tree */
- mode = S_IFREG | 0644;
- }
- size = cache_entry_size(len);
- ce = xcalloc(1, size);
- 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_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
-
- cache_tree_invalidate_path(&the_index, path);
-
- return commit;
- }
-
- 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(obj, NULL, 0);
- if (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 = name;
- return found;
- }
-
- static char *prepare_final(struct scoreboard *sb)
- {
- const char *name;
- sb->final = find_single_final(sb->revs, &name);
- return xstrdup_or_null(name);
- }
-
- static const char *dwim_reverse_initial(struct scoreboard *sb)
- {
- /*
- * 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 (sb->revs->pending.nr != 1)
- return NULL;
-
- /* Is that sole rev a committish? */
- obj = sb->revs->pending.objects[0].item;
- obj = deref_tag(obj, NULL, 0);
- if (obj->type != OBJ_COMMIT)
- return NULL;
-
- /* Do we have HEAD? */
- if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL))
- return NULL;
- head_commit = lookup_commit_reference_gently(&head_oid, 1);
- if (!head_commit)
- return NULL;
-
- /* Turn "ONE" into "ONE..HEAD" then */
- obj->flags |= UNINTERESTING;
- add_pending_object(sb->revs, &head_commit->object, "HEAD");
-
- sb->final = (struct commit *)obj;
- return sb->revs->pending.objects[0].name;
- }
-
- static char *prepare_initial(struct scoreboard *sb)
- {
- int i;
- const char *final_commit_name = NULL;
- struct rev_info *revs = sb->revs;
-
- /*
- * 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(obj, NULL, 0);
- if (obj->type != OBJ_COMMIT)
- die("Non commit %s?", revs->pending.objects[i].name);
- if (sb->final)
- die("More than one commit to dig up from, %s and %s?",
- revs->pending.objects[i].name,
- final_commit_name);
- sb->final = (struct commit *) obj;
- final_commit_name = revs->pending.objects[i].name;
- }
-
- if (!final_commit_name)
- final_commit_name = dwim_reverse_initial(sb);
- if (!final_commit_name)
- die("No commit to dig up from?");
- return xstrdup(final_commit_name);
- }
-
static int blame_copy_callback(const struct option *option, const char *arg, int unset)
{
int *opt = option->value;
{
struct rev_info revs;
const char *path;
- struct scoreboard sb;
- struct origin *o;
+ struct blame_scoreboard sb;
+ struct blame_origin *o;
struct blame_entry *ent = NULL;
long dashdash_pos, lno;
- char *final_commit_name = NULL;
- enum object_type type;
- struct commit *final_commit = NULL;
+ struct progress_info pi = { NULL, 0 };
struct string_list range_list = STRING_LIST_INIT_NODUP;
int output_option = 0, opt = 0;
blame_date_width = sizeof("2006-10-19");
break;
case DATE_RELATIVE:
- /* TRANSLATORS: This string is used to tell us the maximum
- display width for a relative timestamp in "git blame"
- output. For C locale, "4 years, 11 months ago", which
- takes 22 places, is the longest among various forms of
- relative timestamps, but your language may need more or
- fewer display columns. */
+ /*
+ * TRANSLATORS: This string is used to tell us the
+ * maximum display width for a relative timestamp in
+ * "git blame" output. For C locale, "4 years, 11
+ * months ago", which takes 22 places, is the longest
+ * among various forms of relative timestamps, but
+ * your language may need more or fewer display
+ * columns.
+ */
blame_date_width = utf8_strwidth(_("4 years, 11 months ago")) + 1; /* add the null */
break;
case DATE_NORMAL:
opt |= (PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE |
PICKAXE_BLAME_COPY_HARDER);
- if (!blame_move_score)
- blame_move_score = BLAME_DEFAULT_MOVE_SCORE;
- if (!blame_copy_score)
- blame_copy_score = BLAME_DEFAULT_COPY_SCORE;
-
/*
* We have collected options unknown to us in argv[1..unk]
* which are to be passed to revision machinery if we are
revs.disable_stdin = 1;
setup_revisions(argc, argv, &revs, NULL);
- memset(&sb, 0, sizeof(sb));
+ init_scoreboard(&sb);
sb.revs = &revs;
- if (!reverse) {
- final_commit_name = prepare_final(&sb);
- sb.commits.compare = compare_commits_by_commit_date;
- }
- else if (contents_from)
- die(_("--contents and --reverse do not blend well."));
- else {
- final_commit_name = prepare_initial(&sb);
- sb.commits.compare = compare_commits_by_reverse_commit_date;
- if (revs.first_parent_only)
- revs.children.name = NULL;
- }
-
- if (!sb.final) {
- /*
- * "--not A B -- path" without anything positive;
- * do not default to HEAD, but use the working tree
- * or "--contents".
- */
- setup_work_tree();
- sb.final = fake_working_tree_commit(&sb.revs->diffopt,
- path, contents_from);
- add_pending_object(&revs, &(sb.final->object), ":");
- }
- else if (contents_from)
- die(_("cannot use --contents with final commit object name"));
-
- if (reverse && 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(&revs))
- die(_("revision walk setup failed"));
-
- if (reverse && revs.first_parent_only) {
- struct commit *c = final_commit;
-
- sb.revs->children.name = "children";
- while (c->parents &&
- oidcmp(&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))
- die("BUG: not unique item in first-parent chain");
- c = c->parents->item;
- }
-
- if (oidcmp(&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 = sb.final->util;
- sb.final_buf = xmemdupz(o->file.ptr, o->file.size);
- sb.final_buf_size = o->file.size;
- }
- else {
- o = get_origin(&sb, sb.final, path);
- if (fill_blob_sha1_and_mode(o))
- die(_("no such path %s in %s"), path, final_commit_name);
-
- if (DIFF_OPT_TST(&sb.revs->diffopt, ALLOW_TEXTCONV) &&
- textconv_object(path, o->mode, &o->blob_oid, 1, (char **) &sb.final_buf,
- &sb.final_buf_size))
- ;
- else
- sb.final_buf = read_sha1_file(o->blob_oid.hash, &type,
- &sb.final_buf_size);
-
- if (!sb.final_buf)
- die(_("cannot read blob %s for path %s"),
- oid_to_hex(&o->blob_oid),
- path);
- }
- num_read_blob++;
- lno = prepare_lines(&sb);
+ sb.contents_from = contents_from;
+ sb.reverse = reverse;
+ setup_scoreboard(&sb, path, &o);
+ lno = sb.num_lines;
if (lno && !range_list.nr)
string_list_append(&range_list, "1");
for (range_i = ranges.nr; range_i > 0; --range_i) {
const struct range *r = &ranges.ranges[range_i - 1];
- long bottom = r->start;
- long top = r->end;
- struct blame_entry *next = ent;
- ent = xcalloc(1, sizeof(*ent));
- ent->lno = bottom;
- ent->num_lines = top - bottom;
- ent->suspect = o;
- ent->s_lno = bottom;
- ent->next = next;
- origin_incref(o);
+ ent = blame_entry_prepend(ent, r->start, r->end, o);
}
o->suspects = ent;
prio_queue_put(&sb.commits, o->commit);
- origin_decref(o);
+ blame_origin_decref(o);
range_set_release(&ranges);
string_list_clear(&range_list, 0);
sb.ent = NULL;
sb.path = path;
+ if (blame_move_score)
+ sb.move_score = blame_move_score;
+ if (blame_copy_score)
+ sb.copy_score = blame_copy_score;
+
+ sb.debug = DEBUG;
+ sb.on_sanity_fail = &sanity_check_on_fail;
+
+ sb.show_root = show_root;
+ sb.xdl_opts = xdl_opts;
+ sb.no_whole_file_rename = no_whole_file_rename;
+
read_mailmap(&mailmap, NULL);
+ sb.found_guilty_entry = &found_guilty_entry;
+ sb.found_guilty_entry_data = π
+ if (show_progress)
+ pi.progress = start_progress_delay(_("Blaming lines"),
+ sb.num_lines, 50, 1);
+
assign_blame(&sb, opt);
+ stop_progress(&pi.progress);
+
if (!incremental)
setup_pager();
-
- free(final_commit_name);
-
- if (incremental)
+ else
return 0;
- sb.ent = blame_sort(sb.ent, compare_blame_final);
+ blame_sort_final(&sb);
- coalesce(&sb);
+ blame_coalesce(&sb);
if (!(output_option & OUTPUT_PORCELAIN))
find_alignment(&sb, &output_option);
}
if (show_stats) {
- printf("num read blob: %d\n", num_read_blob);
- printf("num get patch: %d\n", num_get_patch);
- printf("num commits: %d\n", num_commits);
+ printf("num read blob: %d\n", sb.num_read_blob);
+ printf("num get patch: %d\n", sb.num_get_patch);
+ printf("num commits: %d\n", sb.num_commits);
}
return 0;
}