return path->path;
}
+
+/* find set of paths that every parent touches */
+static struct combine_diff_path *find_paths_generic(const unsigned char *sha1,
+ const struct sha1_array *parents, struct diff_options *opt)
+{
+ struct combine_diff_path *paths = NULL;
+ int i, num_parent = parents->nr;
+
+ int output_format = opt->output_format;
+ const char *orderfile = opt->orderfile;
+
+ opt->output_format = DIFF_FORMAT_NO_OUTPUT;
+ /* tell diff_tree to emit paths in sorted (=tree) order */
+ opt->orderfile = NULL;
+
+ /* D(A,P1...Pn) = D(A,P1) ^ ... ^ D(A,Pn) (wrt paths) */
+ for (i = 0; i < num_parent; i++) {
+ /*
+ * show stat against the first parent even when doing
+ * combined diff.
+ */
+ int stat_opt = (output_format &
+ (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT));
+ if (i == 0 && stat_opt)
+ opt->output_format = stat_opt;
+ else
+ opt->output_format = DIFF_FORMAT_NO_OUTPUT;
+ diff_tree_sha1(parents->sha1[i], sha1, "", opt);
+ diffcore_std(opt);
+ paths = intersect_paths(paths, i, num_parent);
+
+ /* if showing diff, show it in requested order */
+ if (opt->output_format != DIFF_FORMAT_NO_OUTPUT &&
+ orderfile) {
+ diffcore_order(orderfile);
+ }
+
+ diff_flush(opt);
+ }
+
+ opt->output_format = output_format;
+ opt->orderfile = orderfile;
+ return paths;
+}
+
+
+/*
+ * find set of paths that everybody touches, assuming diff is run without
+ * rename/copy detection, etc, comparing all trees simultaneously (= faster).
+ */
+static struct combine_diff_path *find_paths_multitree(
+ const unsigned char *sha1, const struct sha1_array *parents,
+ struct diff_options *opt)
+{
+ int i, nparent = parents->nr;
+ const unsigned char **parents_sha1;
+ struct combine_diff_path paths_head;
+ struct strbuf base;
+
+ parents_sha1 = xmalloc(nparent * sizeof(parents_sha1[0]));
+ for (i = 0; i < nparent; i++)
+ parents_sha1[i] = parents->sha1[i];
+
+ /* fake list head, so worker can assume it is non-NULL */
+ paths_head.next = NULL;
+
+ strbuf_init(&base, PATH_MAX);
+ diff_tree_paths(&paths_head, sha1, parents_sha1, nparent, &base, opt);
+
+ strbuf_release(&base);
+ free(parents_sha1);
+ return paths_head.next;
+}
+
+
void diff_tree_combined(const unsigned char *sha1,
const struct sha1_array *parents,
int dense,
{
struct diff_options *opt = &rev->diffopt;
struct diff_options diffopts;
- struct combine_diff_path *p, *paths = NULL;
+ struct combine_diff_path *p, *paths;
int i, num_paths, needsep, show_log_first, num_parent = parents->nr;
+ int need_generic_pathscan;
+
+ /* nothing to do, if no parents */
+ if (!num_parent)
+ return;
+
+ show_log_first = !!rev->loginfo && !rev->no_commit_id;
+ needsep = 0;
+ if (show_log_first) {
+ show_log(rev);
+
+ if (rev->verbose_header && opt->output_format &&
+ opt->output_format != DIFF_FORMAT_NO_OUTPUT)
+ printf("%s%c", diff_line_prefix(opt),
+ opt->line_termination);
+ }
diffopts = *opt;
copy_pathspec(&diffopts.pathspec, &opt->pathspec);
- diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
DIFF_OPT_SET(&diffopts, RECURSIVE);
DIFF_OPT_CLR(&diffopts, ALLOW_EXTERNAL);
- /* tell diff_tree to emit paths in sorted (=tree) order */
- diffopts.orderfile = NULL;
- show_log_first = !!rev->loginfo && !rev->no_commit_id;
- needsep = 0;
- /* find set of paths that everybody touches */
- for (i = 0; i < num_parent; i++) {
- /* show stat against the first parent even
+ /* find set of paths that everybody touches
+ *
+ * NOTE
+ *
+ * Diffcore transformations are bound to diff_filespec and logic
+ * comparing two entries - i.e. they do not apply directly to combine
+ * diff.
+ *
+ * If some of such transformations is requested - we launch generic
+ * path scanning, which works significantly slower compared to
+ * simultaneous all-trees-in-one-go scan in find_paths_multitree().
+ *
+ * TODO some of the filters could be ported to work on
+ * combine_diff_paths - i.e. all functionality that skips paths, so in
+ * theory, we could end up having only multitree path scanning.
+ *
+ * NOTE please keep this semantically in sync with diffcore_std()
+ */
+ need_generic_pathscan = opt->skip_stat_unmatch ||
+ DIFF_OPT_TST(opt, FOLLOW_RENAMES) ||
+ opt->break_opt != -1 ||
+ opt->detect_rename ||
+ opt->pickaxe ||
+ opt->filter;
+
+
+ if (need_generic_pathscan) {
+ /*
+ * NOTE generic case also handles --stat, as it computes
+ * diff(sha1,parent_i) for all i to do the job, specifically
+ * for parent0.
+ */
+ paths = find_paths_generic(sha1, parents, &diffopts);
+ }
+ else {
+ int stat_opt;
+ paths = find_paths_multitree(sha1, parents, &diffopts);
+
+ /*
+ * show stat against the first parent even
* when doing combined diff.
*/
- int stat_opt = (opt->output_format &
+ stat_opt = (opt->output_format &
(DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT));
- if (i == 0 && stat_opt)
+ if (stat_opt) {
diffopts.output_format = stat_opt;
- else
- diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
- diff_tree_sha1(parents->sha1[i], sha1, "", &diffopts);
- diffcore_std(&diffopts);
- paths = intersect_paths(paths, i, num_parent);
- if (show_log_first && i == 0) {
- show_log(rev);
-
- if (rev->verbose_header && opt->output_format)
- printf("%s%c", diff_line_prefix(opt),
- opt->line_termination);
+ diff_tree_sha1(parents->sha1[0], sha1, "", &diffopts);
+ diffcore_std(&diffopts);
+ if (opt->orderfile)
+ diffcore_order(opt->orderfile);
+ diff_flush(&diffopts);
}
-
- /* if showing diff, show it in requested order */
- if (diffopts.output_format != DIFF_FORMAT_NO_OUTPUT &&
- opt->orderfile) {
- diffcore_order(opt->orderfile);
- }
-
- diff_flush(&diffopts);
}
/* find out number of surviving paths */