diff options
| -rw-r--r-- | merge-ort.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/merge-ort.c b/merge-ort.c index 37aaac38b9..15ce7f8c52 100644 --- a/merge-ort.c +++ b/merge-ort.c @@ -62,6 +62,53 @@ struct traversal_callback_data { struct name_entry names[3]; }; +struct deferred_traversal_data { + /* + * possible_trivial_merges: directories to be explored only when needed + * + * possible_trivial_merges is a map of directory names to + * dir_rename_mask. When we detect that a directory is unchanged on + * one side, we can sometimes resolve the directory without recursing + * into it. Renames are the only things that can prevent such an + * optimization. However, for rename sources: + * - If no parent directory needed directory rename detection, then + * no path under such a directory can be a relevant_source. + * and for rename destinations: + * - If no cached rename has a target path under the directory AND + * - If there are no unpaired relevant_sources elsewhere in the + * repository + * then we don't need any path under this directory for a rename + * destination. The only way to know the last item above is to defer + * handling such directories until the end of collect_merge_info(), + * in handle_deferred_entries(). + * + * For each we store dir_rename_mask, since that's the only bit of + * information we need, other than the path, to resume the recursive + * traversal. + */ + struct strintmap possible_trivial_merges; + + /* + * trivial_merges_okay: if trivial directory merges are okay + * + * See possible_trivial_merges above. The "no unpaired + * relevant_sources elsewhere in the repository" is a single boolean + * per merge side, which we store here. Note that while 0 means no, + * 1 only means "maybe" rather than "yes"; we optimistically set it + * to 1 initially and only clear when we determine it is unsafe to + * do trivial directory merges. + */ + unsigned trivial_merges_okay; + + /* + * target_dirs: ancestor directories of rename targets + * + * target_dirs contains all directory names that are an ancestor of + * any rename destination. + */ + struct strset target_dirs; +}; + struct rename_info { /* * All variables that are arrays of size 3 correspond to data tracked @@ -119,6 +166,8 @@ struct rename_info { */ struct strintmap relevant_sources[3]; + struct deferred_traversal_data deferred[3]; + /* * dir_rename_mask: * 0: optimization removing unmodified potential rename source okay @@ -501,6 +550,11 @@ static void clear_or_reinit_internal_opts(struct merge_options_internal *opti, strmap_clear(&renames->dir_rename_count[i], 1); } } + for (i = MERGE_SIDE1; i <= MERGE_SIDE2; ++i) { + strintmap_func(&renames->deferred[i].possible_trivial_merges); + strset_func(&renames->deferred[i].target_dirs); + renames->deferred[i].trivial_merges_okay = 1; /* 1 == maybe */ + } renames->cached_pairs_valid_side = 0; renames->dir_rename_mask = 0; @@ -4065,6 +4119,13 @@ static void merge_start(struct merge_options *opt, struct merge_result *result) strset_init_with_options(&renames->cached_target_names[i], NULL, 0); } + for (i = MERGE_SIDE1; i <= MERGE_SIDE2; i++) { + strintmap_init_with_options(&renames->deferred[i].possible_trivial_merges, + 0, NULL, 0); + strset_init_with_options(&renames->deferred[i].target_dirs, + NULL, 1); + renames->deferred[i].trivial_merges_okay = 1; /* 1 == maybe */ + } /* * Although we initialize opt->priv->paths with strdup_strings=0, |